CN110332635A - Double-stage compression multi-air-supply refrigeration heat pump system, control method and air conditioner - Google Patents
Double-stage compression multi-air-supply refrigeration heat pump system, control method and air conditioner Download PDFInfo
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- CN110332635A CN110332635A CN201910616387.6A CN201910616387A CN110332635A CN 110332635 A CN110332635 A CN 110332635A CN 201910616387 A CN201910616387 A CN 201910616387A CN 110332635 A CN110332635 A CN 110332635A
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- 238000007906 compression Methods 0.000 title claims abstract description 156
- 230000006835 compression Effects 0.000 title claims abstract description 155
- 238000005057 refrigeration Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003507 refrigerant Substances 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 31
- 238000001514 detection method Methods 0.000 claims description 15
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 abstract description 10
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 36
- 238000010257 thawing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 8
- 238000004781 supercooling Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007701 flash-distillation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000009790 rate-determining step (RDS) Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003276 anti-hypertensive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AFYPFACVUDMOHA-UHFFFAOYSA-N chlorotrifluoromethane Chemical compound FC(F)(F)Cl AFYPFACVUDMOHA-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides a double-stage compression multi-air-supply refrigeration heat pump system, a control method and an air conditioner, wherein the refrigeration heat pump system comprises: high-pressure stage compression portion (100) and low-pressure stage compression portion (200), be provided with first tonifying qi entry (101) between high-pressure stage compression portion (100) and low-pressure stage compression portion (200), still be provided with second tonifying qi entry (201) in low-pressure stage compression portion (200), still include first tonifying qi subassembly (3) and second tonifying qi subassembly (4), first tonifying qi subassembly (3) and first tonifying qi entry (101) intercommunication are in order to carry out the tonifying qi from first tonifying qi entry (101), and second tonifying qi subassembly (4) and second tonifying qi entry (201) intercommunication are in order to carry out the tonifying qi from second tonifying qi entry (201). The invention effectively reduces the first-stage compression part compared with the prior scheme while realizing the function of supplementing air twice, thereby leading the compression mechanism to be simpler, reducing the compression loss and the cost to be lower, and effectively improving the performance and the reliability of circulation.
Description
Technical field
The invention belongs to air-conditioning technical fields, and in particular to a kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression, controlling party
Method and air conditioner.
Background technique
Steam compression cycle with tonifying Qi is to improve the highly effective mode of refrigeration/heat pump system performance, is mended in working chamber
The Two-stage Compression technology of tonifying Qi is two kinds of common technological means between the quasi- two-stage compression technology of gas, grade.With air source heat pump
Technology in the popularization and application of the northern area of China, find existing tonifying Qi technology still remain adapt to ambient temperature range less, system
The restraining factors that thermal energy power is insufficient, low-temperature heating efficiency is not high, cold/severe cold area for affecting air source heat pump technology use
Comfort, energy saving and reliability.It exists in the prior art simply using three stage compression (such as CN102062496B), two
The mode of secondary tonifying Qi carrys out further decomposition pressure ratio, increases refrigerant flow, to improve the performance of system at low ambient temperatures.But
This mode increases the number of the quantity of compression unit, the quantity of moving component and exhaust, so that the performance and reliability of circulation
It cannot significantly improve, and cost is significantly increased.
The comfort that is used due to the air source heat pump in the prior art with tonifying Qi in cold/severe cold area, energy conservation
Property and reliability are poor；The cooling cycle system of three stage compression, twice tonifying Qi due to increasing tonifying Qi by increasing compression stage, and
And compression mechanism is complicated, compression losses increases, unobvious to the performance and reliability for promoting circulation, cost of implementation higher cost compared with
High technical problem, therefore researching and designing of the present invention goes out a kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression, control method and sky
Adjust device.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that the air source heat pump in the prior art with tonifying Qi is overcome to deposit
The defect for increasing tonifying Qi by increasing compression stage, and compression mechanism complexity, compression losses being caused to increase is needed in tonifying Qi twice,
To provide a kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression, control method and air conditioner.
The present invention provides a kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression comprising:
Hiigh pressure stage compression unit and low-pressure stage compression unit are set between the hiigh pressure stage compression unit and the low-pressure stage compression unit
It is equipped with the first tonifying Qi entrance, the second tonifying Qi entrance is additionally provided in the low-pressure stage compression unit, further includes the first tonifying Qi component
With the second tonifying Qi component, the first tonifying Qi component is connected to the institute to position progress tonifying Qi with the first tonifying Qi entrance
The second tonifying Qi component is stated to be connected to the second tonifying Qi entrance to carry out tonifying Qi to the position.
Preferably,
The first tonifying Qi component includes the first flash vessel, and first flash vessel includes first entrance end, first gas
Outlet end and the first liquid outlet end, and the first gas outlet end and the first tonifying Qi entrance are connected by the first pipeline
It is logical；And/or
The second tonifying Qi component includes the second flash vessel, and second flash vessel includes second entrance end, second gas
Outlet end and second liquid outlet end, and the second gas outlet end is connected by the second pipeline and the second tonifying Qi entrance
It is logical.
Preferably,
Control valve is additionally provided on second pipeline；And/or first liquid outlet end passes through third pipeline and institute
The connection of second entrance end is stated, and is provided with first throttling device on the third pipeline.
Preferably,
The refrigeration heat pump system further includes First Heat Exchanger and the second heat exchanger, the First Heat Exchanger and the high pressure
The outlet of grade compressor, second heat exchanger is connected to the entrance of low-pressure stage compressor, and the First Heat Exchanger and
The first entrance end of first flash vessel is connected to and is additionally provided between the First Heat Exchanger and first flash vessel
Second throttling device；Second heat exchanger is connected to the second liquid outlet end of second flash vessel and described second
Third throttling set is additionally provided between heat exchanger and second flash vessel；
Alternatively, the refrigeration heat pump system further includes First Heat Exchanger and the second heat exchanger, the First Heat Exchanger and institute
State the entrance connection of low-pressure stage compressor, the outlet of second heat exchanger and high pressure stage compressor, first heat exchange
Device is connected to the first liquid outlet end of first flash vessel and between the First Heat Exchanger and first flash vessel
It is additionally provided with second throttling device；Second heat exchanger is connected to and with the second entrance end of second flash vessel described
Third throttling set is additionally provided between second heat exchanger and second flash vessel.
Preferably,
The first tonifying Qi component includes the first Intermediate Heat Exchanger or the first economizer, and the second tonifying Qi component includes the
Two Intermediate Heat Exchangers or the second economizer.
Preferably,
The refrigeration heat pump system further includes the first temperature-detecting device that can be detected in the First Heat Exchanger and can examine
The second temperature detection device in second heat exchanger is surveyed, and the refrigeration heat pump system further includes controller, when further including
When control valve, the controller can be according to the temperature of first temperature-detecting device and second temperature detection device detection
It controls the control valve to open or close, to execute tonifying Qi twice or a tonifying Qi.
The present invention also provides a kind of control methods of refrigeration heat pump system, are freezed using the more tonifying Qi of Two-stage Compression above-mentioned
Heat pump system, according to the judgement of the temperature relation of two heat exchangers and control system executes tonifying Qi twice or a tonifying Qi.
Preferably,
Detecting step detects the refrigerant temperature in the second heat exchanger of refrigerant temperature T1 and detection in First Heat Exchanger
Spend T2；
Judgment step, judges whether T1 is greater than T2；
Step is executed, if the judging result of the judgment step is T1 < T2, controls the control valve in refrigeration heat pump system
It closes, executes the second operational mode of a tonifying Qi.
Preferably,
The judgment step is also used to judging as T1 > T2, calculate T1 and T2 temperature it is corresponding under saturated vapour pressure
P1 and P2, and judge whether P1/P2 is greater than n, wherein n is setting value；
The execution step is also used to when judging that P1/P2 is less than n, and the control valve controlled in refrigeration heat pump system closes
It closes, executes the second operational mode of a tonifying Qi；When judging that P1/P2 is greater than n, the control valve in refrigeration heat pump system is controlled
It opens, executes the first operational mode of tonifying Qi twice.
The present invention also provides a kind of air conditioners comprising preceding described in any item Two-stage Compression more tonifying Qi refrigerating heat pumps system
System.
A kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression provided by the invention, control method and air conditioner have and have as follows
Beneficial effect:
1. the present invention is arranged in the inside of low-pressure stage compression unit by the way that the first tonifying Qi entrance is arranged between two compression units
There is the second tonifying Qi entrance, the first tonifying Qi component is connected to carry out tonifying Qi, the second tonifying Qi component to the position with the first tonifying Qi entrance
It is connected to the second tonifying Qi entrance to carry out tonifying Qi to the position, can be realized and carry out tonifying Qi twice in Two-stage Compression, compared to tradition
Two-stage enthalpy increasing refrigeration system, further improves air compensation, increases refrigerant degree of supercooling, thus promoted refrigerating/heating amount with
The coefficient of performance；And it if desired carries out tonifying Qi twice relative to traditional Gas-supplying enthalpy-increasing refrigeration system then to need that three stage compression is arranged
Scheme for, the present invention only needs two stages of compression portion to be just able to achieve, thus realize tonifying Qi twice function while, compare
Existing scheme effectively reduces one stage of compression portion so that compression mechanism is more simple, compression losses reduce, cost more
It is low, effectively improve the performance and reliability of circulation；And the scheme of two-stage tonifying Qi of the invention by between two-stage and
Tonifying Qi is distinguished on low-pressure stage compression unit, relative to tonifying Qi+high pressure cylinder tonifying Qi between tonifying Qi between grade+compressor air suction mouth tonifying Qi and grade
For, due to directly filling into low pressure (LP) cylinder, tonifying Qi expansion-loss is small, and can directly reduce low pressure (LP) cylinder temperature, improves the pressure of low pressure (LP) cylinder
Contracting efficiency, and compressor reliability is improved, and be able to achieve supercooling more than twice, greatly improve refrigerating/heating ability.
2. and the invention proposes the mode switching methods of the more air compensating systems of Two-stage Compression, use twin-stage pressure in heating
The mode of contracting tonifying Qi twice, in refrigeration and defrosting using the mode of Two-stage Compression single tonifying Qi, so that the circulatory system is in difference
Under operating condition, best performance under different temperatures so that compressor and system Applicable temperature range are wider.
Detailed description of the invention
Fig. 1 is the first operational mode and refrigerant circulation flow path of the more air compensating systems of Two-stage Compression of the invention；
Fig. 2 is the second operational mode and refrigerant circulation flow path of the more air compensating systems of Two-stage Compression of the invention；
Fig. 3 is the pressure-enthalpy chart of the first operational mode of the invention；
Fig. 4 is the pressure-enthalpy chart of the second operational mode of the invention；
Fig. 5 is the control method flow chart of refrigeration heat pump system of the invention；
Fig. 6 is the first operational mode and refrigerant circulation of the more air compensating systems of Two-stage Compression of the invention (alternate embodiment)
Flow path；
Fig. 7 is the pressure-enthalpy chart of the method for operation in Fig. 6.
Appended drawing reference indicates in figure are as follows:
100, hiigh pressure stage compression unit；200, low-pressure stage compression unit；101, the first tonifying Qi entrance；201, the second tonifying Qi entrance；
3, the first tonifying Qi component；31, the first flash vessel；31a, first entrance end；31b, first gas outlet end；31c, the first liquid discharge
Mouth end；111, the first pipeline；32, the first Intermediate Heat Exchanger；4, the second tonifying Qi component；41, the second flash vessel；41a, second entrance
End；41b, second gas outlet end；41c, second liquid outlet end；112, the second pipeline；113, third pipeline；51, first segment
It flows device (preferably expansion valve B)；52, second throttling device (preferably expansion valve A)；53, third throttling set (preferably expansion valve
C)；6, control valve；71, First Heat Exchanger；72, the second heat exchanger.
Specific embodiment
As shown in figs. 1-7, the present invention provides a kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression comprising:
Hiigh pressure stage compression unit 100 and low-pressure stage compression unit 200, in the hiigh pressure stage compression unit 100 and the low-pressure stage pressure
It is provided with the first tonifying Qi entrance 101 between contracting portion 200, the second tonifying Qi entrance is additionally provided in the low-pressure stage compression unit 200
201, it further include the first tonifying Qi component 3 and the second tonifying Qi component 4, the first tonifying Qi component 3 and the first tonifying Qi entrance 101
Connection with to the position carry out tonifying Qi and the second tonifying Qi component 4 is connected to the second tonifying Qi entrance 201 to the position
Carry out tonifying Qi.
By the way that the first tonifying Qi entrance is arranged between two compression units, the second benefit is provided in the inside of low-pressure stage compression unit
Gas entrance, the first tonifying Qi component is connected to carry out tonifying Qi to the position with the first tonifying Qi entrance, the second tonifying Qi component and second is mended
The connection of gas entrance can be realized to carry out tonifying Qi to the position and carry out tonifying Qi twice in Two-stage Compression, compared to traditional two-stage enthalpy increasing
Refrigeration system further improves air compensation, increases refrigerant degree of supercooling, to promote refrigerating/heating amount and the coefficient of performance；
And relative to traditional Gas-supplying enthalpy-increasing refrigeration system if desired carry out tonifying Qi twice then need to be arranged three stage compression scheme and
Speech, the present invention only needs two stages of compression portion to be just able to achieve, thus while realizing the function of tonifying Qi twice, compare existing scheme
One stage of compression portion is effectively reduced, so that compression mechanism is more simple, compression losses reduces, cost is lower, is effectively mentioned
The performance and reliability of circulation is risen；And the scheme of two-stage tonifying Qi of the invention by between two-stage and low-pressure stage compress
Tonifying Qi is distinguished in portion, for tonifying Qi+high pressure cylinder tonifying Qi between tonifying Qi between grade+compressor air suction mouth tonifying Qi and grade, due to
Low pressure (LP) cylinder directly is filled into, tonifying Qi expansion-loss is small, and can directly reduce low pressure (LP) cylinder temperature, improve the compression efficiency of low pressure (LP) cylinder, and
Compressor reliability is improved, and is able to achieve supercooling more than twice, greatly improves refrigerating/heating ability.
Preferably,
The first tonifying Qi component 3 include the first flash vessel 31, first flash vessel 31 include first entrance end 31a,
First gas outlet end 31b and the first liquid outlet end 31c, and the first gas outlet end 31b enters with first tonifying Qi
Mouth 101 is connected to by the first pipeline 111；And/or
The second tonifying Qi component 4 include the second flash vessel 41, second flash vessel 41 include second entrance end 41a,
Second gas outlet end 41b and second liquid outlet end 41c, and the second gas outlet end 41b by the second pipeline 112 with
The second tonifying Qi entrance 201 is connected to.
This is the preferred constructive form of the first and second tonifying Qi components of the invention, can effectively be realized through the first pipeline
Or second pipeline between compression unit of just arbitrarily downgrading and the difference Gas-supplying enthalpy-increasing of low-pressure stage compression unit act on.
Preferably,
Control valve 6 is additionally provided on second pipeline 112；Preferably solenoid valve, and/or, first liquid outlet
End 31c is connected to by third pipeline 113 with the second entrance end 41a, and is provided with first segment on the third pipeline 113
Flow device 51.This is present invention further optimization structure type, can be according to need by the way that control valve is arranged on the second pipeline
The valve is opened and closed, such as twin-stage is used in refrigeration and defrosting using the mode of Two-stage Compression tonifying Qi twice in heating
The mode for compressing single tonifying Qi, so that the circulatory system is under different operating conditions, best performance under different temperatures, so that compressor and being
Applicable temperature range of uniting is wider；And first throttling device is set on third pipeline, it can be to by the first flash vessel or the
The liquid or gas-liquid mixture that two flash vessels come out carry out antihypertensive effect, provide condition for the flash distillation of next low-pressure stage.
Preferably,
The refrigeration heat pump system further includes First Heat Exchanger 71 and the second heat exchanger 72, the First Heat Exchanger 71 and institute
The outlet of hiigh pressure stage compression unit 100 is stated, second heat exchanger 72 is connected to the entrance of low-pressure stage compression unit 200, and institute
First Heat Exchanger 71 is stated to be connected to the first entrance end 31a of first flash vessel 31 and in the First Heat Exchanger 71 and institute
It states and is additionally provided with second throttling device 52 between the first flash vessel 31；Second heat exchanger 72 and second flash vessel 41
Second liquid outlet end 41c is connected to and is additionally provided with third between second heat exchanger 72 and second flash vessel 41
Throttling set 53.
As shown in Figure 1, this is the preferred constructive form of the first operational mode in the embodiment of the present invention 1, First Heat Exchanger is
Indoor heat exchanger carries out heating ringing to interior at this time.
Alternatively, the refrigeration heat pump system further includes First Heat Exchanger 71 and the second heat exchanger 72, the First Heat Exchanger
71 are connected to the entrance of the low-pressure stage compression unit 200, and the outlet of second heat exchanger 72 and hiigh pressure stage compression unit 100 connects
Logical, the First Heat Exchanger 71 is connected to the first liquid outlet end 31c of first flash vessel 31 and in first heat exchange
Second throttling device 52 is additionally provided between device 71 and first flash vessel 31；Second heat exchanger 72 is dodged with described second
The second entrance end 41a of steaming device 41 is connected to and is additionally provided between second heat exchanger 72 and second flash vessel 41
Third throttling set 53.
As shown in Fig. 2, this is the preferred constructive form of the second operational mode in the embodiment of the present invention 1, First Heat Exchanger is
Indoor heat exchanger to indoor carry out refrigeration cycle effect or carries out defrosting circulation at this time.
Preferably,
The first tonifying Qi component 3 includes the first Intermediate Heat Exchanger 32 or the first economizer, and the second tonifying Qi component 4 wraps
Include the second Intermediate Heat Exchanger (not shown) or the second economizer.This is the preferred structure shape of alternate embodiment of the invention
Formula substitutes flash vessel by Intermediate Heat Exchanger or economizer, also can be realized shwoot, i.e. gas tonifying Qi, liquid decompression increases enthalpy
The function of increasing enthalpy tonifying Qi is realized in the effect of difference.
Preferably,
The refrigeration heat pump system further includes the first temperature-detecting device that can be detected in the First Heat Exchanger and can examine
The second temperature detection device in second heat exchanger is surveyed, and the refrigeration heat pump system further includes controller, when further including
When control valve 6, the controller can be according to the temperature of first temperature-detecting device and second temperature detection device detection
Degree controls the control valve and opens or closes, to execute tonifying Qi twice (the first operational mode) or a tonifying Qi (the second operation mould
Formula).It, can be according to the heating of refrigeration system or refrigeration mode or defrosting mode by the setting of temperature detection and controller
Difference, which acts on tonifying Qi, carries out different control, since less there is no need to use twin-stage tonifying Qi for indoor/outdoor temperature-difference under refrigeration mode
Increasing enthalpy, the efficiency that can be improved circulation using single-stage tonifying Qi；And in the biggish situation of heating mode especially pressure difference, then it uses
Twin-stage Gas-supplying enthalpy-increasing can effectively improve heating capacity.
For two kinds of operational modes of the application, there is no limit heating must to use using first mode, refrigeration
Second mode can also be used in second mode, under suitable conditions, heating condition, so that system energy efficiency is optimal, Fig. 5 provides one kind
Preferably mode switch control method.Detailed process are as follows: 1. refrigerant temperature T1 in real-time detection heat exchanger 1 and heat exchanger 2,
T2 for cooling condition, closes on-off valve, opens the second operational mode if T1 is less than T2；2. dividing if T1 is greater than T2
Not Ji Suan the corresponding saturated vapour pressure P1=f (T1) of T1, T2, P2=f (T2), and calculate pressure ratio P1/P2；3. by pressure ratio P1/
P2 and setting value n is compared, and n is set according to compressor characteristics, generally takes 3.5~5.5；4. on-off valve is closed if P1/P2 is less than n,
Using the second operational mode；5. on-off valve is opened, using the first operational mode if P1/P2 is greater than n.1. above-mentioned steps can also adopt
Refrigeration mode is judged whether it is with the mode of monitoring four-way valve state, if uses the second operational mode.Using the mode
Switching method is all made of Two-stage Compression, single under the heating mode of refrigeration/defrosting operating condition and pressure ratio no more than setting value n
Second operational mode of tonifying Qi, to improve the efficiency of circulation；Under the heating mode that pressure ratio reaches setting value n or more, using
One operational mode, to improve heating capacity.
The preferred embodiments of the more air compensating systems of Fig. 1 the application Two-stage Compression.As seen from the figure, the refrigeration system is by low
It arbitrarily downgrades compression unit, hiigh pressure stage compression unit, four-way valve, First Heat Exchanger 71, expansion valve A, the first flash vessel 31, expansion valve B, second
Flash vessel 41, expansion valve C, the second heat exchanger 72 composition.Four-way valve setting enters in the outlet of hiigh pressure stage compression unit, low-pressure stage compression unit
Mouth, First Heat Exchanger 71 between second heat exchanger 72, to realize the switching of refrigerant flow direction, and then realize refrigerating/heating mode
Switching.The first tonifying Qi entrance, the first tonifying Qi entrance and first are provided between hiigh pressure stage compression unit and low-pressure stage compression unit
The gas outlet of flash vessel 31 is connected to, and the first flash vessel 31 is set between expansion valve A and expansion valve B.Among low-pressure stage compression unit
It is provided with the second tonifying Qi entrance, the second tonifying Qi entrance is connect with the gas outlet of the second flash vessel 41, and on interface channel
On-off valve is set, and the second flash vessel 41 is set between expansion valve B and expansion valve C.In the first operating mode, hiigh pressure stage is compressed
Portion outlet is connected to indoor heat exchanger, and low-pressure stage compression unit entrance is connected to outdoor heat exchanger, while opening the on-off valve.
The cyclic process of refrigerant are as follows: the low pressure refrigerant 1 flowed out from the second heat exchanger 72 (evaporator)) enter low-pressure stage pressure
Contracting portion entrance, the first tonifying Qi entrance among low-pressure stage compression unit fill into the middle compression refrigerant 10 from the second flash vessel 41),
Form mix refrigerant 13) and it is further compressed to middle 2 discharge low pressure compression unit of pressure；It fills into the second tonifying Qi entrance from
The middle compression refrigerant 7 of one flash vessel 31), with middle pressure gas 2) it is mixed to form middle compression refrigerant 3)；Middle compression refrigerant 3) enter height
Arbitrarily downgrade compression unit, be compressed to high pressure 4) high pressure stage compressor is discharged afterwards；High-pressure refrigerant 4) it flows through and enters heat exchanger 1 after four-way valve
(condenser) heat release forms high pressure liquid refrigerant 5)；Expanded valve A throttles to form two phase refrigerant 6), it is real in flash vessel
Existing gas-liquid analysis, gas 7) fill into above-mentioned first tonifying Qi entrance, liquid 8) throttling again into expansion valve B becomes two phase refrigerant
9), two phase refrigerant 9) gas-liquid separation, gas 10 are realized in flash vessel) fill into above-mentioned second tonifying Qi entrance, liquid 11) enter
Expansion valve C carries out third time throttling cooling and forms low-temperature refrigerant 12), low-temperature refrigerant 12) in the 72 (evaporation of the second heat exchanger
Device) heat absorption after formed low-pressure gaseous refrigerant 1).
It is made of above system and the cyclic process of refrigerant is it is found that by tonifying Qi process twice, become two phase refrigerant
It for liquid refrigerant, realizes refrigerant and is subcooled twice, to further reduced the enthalpy of evaporator inlet refrigerant, increase
Refrigerant evaporation process enthalpy difference, improves refrigerating capacity；By tonifying Qi twice, the extraction flow of compressor is further improved,
To increase the refrigerant flow in condenser, thus improve the heating capacity of system.For traditional double-stage compressor, two
The pressure difference of grade compression unit is suitable, and the compression ratio of low-pressure stage compression unit is greater than high pressure stage compression ratio, general 1.5 times or more, presses
Contracting score fills into gas in low pressure (LP) cylinder with unevenness, the application, can improve low pressure (LP) cylinder compression ratio, improves compression efficiency.Compared to existing
Three stage compression tonifying Qi technology twice, compression mechanism is more simplified, and compressor whole efficiency is significantly increased, and improves the fortune of compressor
Row reliability.
Fig. 2 is second operational mode of the embodiment of the present application.In this operating mode, the second tonifying Qi entrance and second is closed
On-off valve between 41 gas outlet of flash vessel runs system according to the endless form of Two-stage Compression, single tonifying Qi, the second flash distillation
Device 41 no longer plays the role of gas-liquid separation, and expansion valve C and expansion valve B collective effect realize refrigerant high pressure liquid 5) throttling is extremely
Two phases 6 of middle pressure), so gas-liquid separation, isolated gas 7 are realized in the first flash vessel 31) fill into low-pressure stage compression unit with
Between hiigh pressure stage compression unit, isolated liquid 8) enter expansion valve A.Under cooling condition, since the opposite heating of pressure ratio is lower, adopt
With Two-stage Compression, single tonifying Qi better effect.By the pattern switching of the more air compensating systems of above-mentioned Two-stage Compression, used in heating
The mode of Two-stage Compression, twice tonifying Qi, in refrigeration and defrosting using the mode of Two-stage Compression single tonifying Qi, so that the circulatory system
Under different operating conditions, best performance under different temperatures, so that compressor and system Applicable temperature range are wider.
Fig. 3 gives the pressure-enthalpy chart of first mode system circulation and the comparison of single stage compress, and solid line is that the application first follows
Ring mode, dotted line are single stage compress circulation.Low-pressure stage compressor air suction mass flow is m0, and the first tonifying Qi mass flow is m1,
Second tonifying Qi mass flow is m2.It recycles and compares with single stage compress, refrigerant circulation flow increases to m0+m1+m2 by m0, through 2
Secondary supercooling, evaporator inlet enthalpy is first reduced to h8 by h6 (6 '), then is reduced to h12, thus the refrigerating/heating amount recycled is substantially
It is promoted；Compressor air-discharging state 4) with the exhaust 4 ' of single stage compress closer to saturated vaporline, temperature is lower, effectively reduces system
Delivery temperature when hot high pressure ratio is run, improves compressor reliability；In terms of compression process, the pressure ratio of single stage compress is p4/
P1, and application scheme is broken down into p4/p3, p2/p13 improves the effect of compressor so that every grade of compression is more efficient
Rate.
Fig. 4 gives the pressure-enthalpy chart of system circulation under second mode, under refrigeration/defrosting operating condition, by being once subcooled, steams
It sends out device enthalpy difference and h1-h8 is increased to by h1-h6.Since pressure ratio is relatively small, and air-breathing density is higher, using two stages of compression, single
The endless form of tonifying Qi had not only been able to satisfy the demand of refrigerating capacity, but also kept system control and regulation relatively easy, and efficiency is higher.
Using the refrigeration/heat pump system of application scheme, there is room temperature operating condition efficiency height, high pressure ratio, worst cold case heating
Big distinguishing feature is measured, the use demand of different operating conditions, varying environment temperature can be met, so that compressor and system Applicable temperature
Range is wider.With in CN102062496B three stage compression, twice compared with tonifying Qi technology, save one stage of compression mechanism, have
Simple, the at low cost technical advantage of structure.
The present invention also provides a kind of control methods of refrigeration heat pump system, are freezed using the more tonifying Qi of Two-stage Compression above-mentioned
Heat pump system, according to the judgement of the temperature relation of two heat exchangers and control system executes tonifying Qi twice or a tonifying Qi.
If desired the control method of refrigeration heat pump system of the invention is carried out relative to traditional Gas-supplying enthalpy-increasing refrigeration system
For tonifying Qi twice then needs to be arranged the scheme of three stage compression, the present invention only needs two stages of compression portion to be just able to achieve, therefore in reality
One stage of compression portion is now effectively reduced while the function of tonifying Qi twice, compared to existing scheme, so that compression mechanism is more
It is lower for simple, compression losses reduction, cost, effectively improve the performance and reliability of circulation；And two-stage of the invention is mended
The scheme of gas is by distinguishing tonifying Qi between two-stage and on low-pressure stage compression unit, relative to tonifying Qi+compressor air suction mouth between grade
Between tonifying Qi and grade for tonifying Qi+high pressure cylinder tonifying Qi, due to directly filling into low pressure (LP) cylinder, tonifying Qi expansion-loss is small, and can directly drop
Low low pressure (LP) cylinder temperature, improves the compression efficiency of low pressure (LP) cylinder, and improves compressor reliability, and is able to achieve supercooling more than twice,
Greatly improve refrigerating/heating ability.
And tonifying Qi effect can be carried out not according to the heating of refrigeration system or the different of refrigeration mode or defrosting mode
With control, under refrigeration mode due to indoor/outdoor temperature-difference less there is no need to using twin-stage Gas-supplying enthalpy-increasing, using single-stage tonifying Qi energy
The enough efficiency for improving circulation；And in the biggish situation of heating mode especially pressure difference, then use twin-stage Gas-supplying enthalpy-increasing, Neng Gouyou
Effect improves heating capacity.
Preferably,
Detecting step detects the refrigerant temperature in the second heat exchanger of refrigerant temperature T1 and detection in First Heat Exchanger
Spend T2；
Judgment step, judges whether T1 is greater than T2；
Step is executed, if the judging result of the judgment step is T1 < T2, controls the control valve in refrigeration heat pump system
It closes, executes the second operational mode of a tonifying Qi.
This be in control method of the invention it is primary detection, judgement and rate-determining steps, can be effective by above-mentioned means
Ground judge indoor and outdoor the temperature difference whether be interior is corresponded to belong to refrigeration mode or defrosting mode or heating mode, if
T1 is less than T2, then is cooling condition, closes on-off valve, opens the second operational mode, because under cooling condition, due to pressure ratio phase
It is lower to heating, using Two-stage Compression, single tonifying Qi better effect.It is cut by the mode of the more air compensating systems of above-mentioned Two-stage Compression
It changes, in heating using Two-stage Compression, the mode of tonifying Qi twice, in refrigeration and defrosting using the mould of Two-stage Compression single tonifying Qi
Formula, so that the circulatory system is under different operating conditions, best performance under different temperatures, so that compressor and system Applicable temperature range are more
Extensively.
Preferably,
The judgment step is also used to judging as T1 > T2, calculate T1 and T2 temperature it is corresponding under saturated vapour pressure
P1 and P2, and judge whether P1/P2 is greater than n, wherein n is setting value；
The execution step is also used to when judging that P1/P2 is less than n, and the control valve controlled in refrigeration heat pump system closes
It closes, executes the second operational mode of a tonifying Qi；When judging that P1/P2 is greater than n, the control valve in refrigeration heat pump system is controlled
It opens, executes the first operational mode of tonifying Qi twice.
This is further detection, calculating, judgement and rate-determining steps in control method of the invention, passes through above-mentioned means
Whether the temperature difference for first determining whether out indoor and outdoor is that correspond to interior be heating mode, calculates separately the corresponding saturated vapor of T1, T2
Pressure P1=f (T1), P2=f (T2), and calculate pressure ratio P1/P2；3. pressure ratio P1/P2 and setting value n is compared, n is according to compression
Machine property settings, generally take 3.5~5.5；4. if P1/P2 be less than n, close on-off valve, using the second operational mode (at this time because
Therefore pressure difference less can reach requirement using single-stage Gas-supplying enthalpy-increasing, can be improved the efficiency of circulation, wasted work is few)；5. if P1/P2
Greater than n, on-off valve is opened, using the first operational mode.1. monitoring four-way valve state can also be used in above-mentioned steps mode judges
It whether is refrigeration mode, if use the second operational mode.Using the mode switching method, in refrigeration/defrosting operating condition, and
Under heating mode of the pressure ratio no more than setting value n, it is all made of the second operational mode of Two-stage Compression, single tonifying Qi, is followed with improving
The efficiency of ring；Under the heating mode that pressure ratio reaches setting value n or more, using the first operational mode, to improve heating capacity.
The present invention also provides a kind of air conditioners comprising preceding described in any item Two-stage Compression more tonifying Qi refrigerating heat pumps system
System.Air conditioner of the invention effectively reduces one stage of compression portion compared to existing scheme when realizing the effect of same tonifying Qi, from
And make more simple compression mechanism, compression losses reduction, cost lower, effectively improve the performance and reliability of circulation；And
And the scheme of two-stage tonifying Qi of the invention is mended by distinguishing tonifying Qi between two-stage and on low-pressure stage compression unit relative between grade
Between gas+compressor air suction mouth tonifying Qi and grade for tonifying Qi+high pressure cylinder tonifying Qi, due to directly filling into low pressure (LP) cylinder, tonifying Qi expansion damage
It loses small, and can directly reduce low pressure (LP) cylinder temperature, improve the compression efficiency of low pressure (LP) cylinder, and improve compressor reliability, and be able to achieve
Supercooling more than twice greatly improves refrigerating/heating ability.
Preferably there is following technical effect in the present invention:
1, the refrigeration/heat pump system of technical solution of the present invention proposes Two-stage Compression, multiple tonifying Qi, realizes refrigerant two
Secondary supercooling further reduced the enthalpy of evaporator inlet refrigerant compared with prior art, increase refrigerant evaporation process enthalpy
Difference improves refrigerating capacity；By tonifying Qi twice, the extraction flow of compressor is further improved, to increase condenser
In refrigerant flow, thus improve the heating capacity of system.
2, the more air compensating systems of Two-stage Compression that technical solution of the present invention proposes, by between two compression units and low-pressure stage
Tonifying Qi in compression unit keeps compression mechanism more simplified, and pressure ratio distribution is more reasonable, and compressor whole efficiency is significantly increased, and improves
The operational reliability of compressor.
3, technical solution of the present invention proposes the mode switching method of the more air compensating systems of Two-stage Compression, in heating using double
The mode of grade compression tonifying Qi twice, in refrigeration and defrosting using the mode of Two-stage Compression single tonifying Qi, so that the circulatory system exists
Under different operating conditions, best performance under different temperatures so that compressor and system Applicable temperature range are wider.
4, the technical advantage that the compressor that technical solution of the present invention proposes has structure simple, at low cost.
Herein described low-pressure stage compression unit, hiigh pressure stage compression unit can form for two compressors, can also compress for separate unit
The realization structure of machine.
The application gives three-level throttling, the tonifying Qi of flash vessel separation twice provides structure, can be by any one or two
Flash vessel structure replaces with heat exchanger structure.Fig. 6 is given the first tonifying Qi and is followed using heat exchanger, the second tonifying Qi using flash vessel
Ring mode, from the liquid refrigerant 5 of high pressure-temperature) to distribute a part of expanded valve A throttling be middle pressure medium temperature refrigerant 6)；6)
It exchanges heat in Intermediate Heat Exchanger with main road refrigerant 5)；6) evaporation endothermic becomes gaseous refrigerant, into the first tonifying Qi entrance；
Main road refrigerant 5) be further cooled to 8), realize refrigerant for the first time be subcooled.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.With
It is only the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art, not
Under the premise of being detached from the technology of the present invention principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as this
The protection scope of invention.
Claims (10)
1. a kind of more tonifying Qi refrigeration heat pump systems of Two-stage Compression, it is characterised in that: include:
Hiigh pressure stage compression unit (100) and low-pressure stage compression unit (200), in the hiigh pressure stage compression unit (100) and the low-pressure stage
It is provided with the first tonifying Qi entrance (101) between compression unit (200), is additionally provided with second in the low-pressure stage compression unit (200)
Tonifying Qi entrance (201), further includes the first tonifying Qi component (3) and the second tonifying Qi component (4), the first tonifying Qi component (3) and institute
The connection of the first tonifying Qi entrance (101) is stated to carry out tonifying Qi and the second tonifying Qi component from the first tonifying Qi entrance (101)
(4) it is connected to the second tonifying Qi entrance (201) to carry out tonifying Qi from the second tonifying Qi entrance (201).
2. the more tonifying Qi refrigeration heat pump systems of Two-stage Compression according to claim 1, it is characterised in that:
The first tonifying Qi component (3) includes the first flash vessel (31), and first flash vessel (31) includes first entrance end
(31a), first gas outlet end (31b) and the first liquid outlet end (31c), and the first gas outlet end (31b) and institute
The first tonifying Qi entrance (101) is stated to be connected to by the first pipeline (111)；And/or
The second tonifying Qi component (4) includes the second flash vessel (41), and second flash vessel (41) includes second entrance end
(41a), second gas outlet end (41b) and second liquid outlet end (41c), and the second gas outlet end (41b) passes through
Second pipeline (112) is connected to the second tonifying Qi entrance (201).
3. the more tonifying Qi refrigeration heat pump systems of Two-stage Compression according to claim 2, it is characterised in that:
Control valve (6) are additionally provided on second pipeline (112)；And/or first liquid outlet end (31c) passes through the
Three pipelines (113) are connected to the second entrance end (41a), and first throttle dress is provided on the third pipeline (113)
Set (51).
4. the more tonifying Qi refrigeration heat pump systems of Two-stage Compression according to claim 2 or 3, it is characterised in that:
The refrigeration heat pump system further includes First Heat Exchanger (71) and the second heat exchanger (72), the First Heat Exchanger (71) with
The outlet of the hiigh pressure stage compression unit (100), the entrance company of second heat exchanger (72) and low-pressure stage compression unit (200)
It is logical, and the First Heat Exchanger (71) is connected to and with the first entrance end (31a) of first flash vessel (31) described first
Second throttling device (52) are additionally provided between heat exchanger (71) and first flash vessel (31)；Second heat exchanger (72)
It is connected to the second liquid outlet end (41c) of second flash vessel (41) and in second heat exchanger (72) and described
Third throttling set (53) are additionally provided between two flash vessels (41)；
Alternatively, the refrigeration heat pump system further includes First Heat Exchanger (71) and the second heat exchanger (72), the First Heat Exchanger
(71) it is connected to the entrance of the low-pressure stage compression unit (200), second heat exchanger (72) and hiigh pressure stage compression unit (100)
Outlet, the First Heat Exchanger (71) be connected to the first liquid outlet end (31c) of first flash vessel (31) and
Second throttling device (52) are additionally provided between the First Heat Exchanger (71) and first flash vessel (31)；Described second changes
Hot device (72) is connected to the second entrance end (41a) of second flash vessel (41) and in second heat exchanger (72) and institute
It states and is additionally provided with third throttling set (53) between the second flash vessel (41).
5. the more tonifying Qi refrigeration heat pump systems of Two-stage Compression described in any one of -4 according to claim 1, it is characterised in that:
The first tonifying Qi component (3) includes the first Intermediate Heat Exchanger (32) or the first economizer, the second tonifying Qi component (4)
Including the second Intermediate Heat Exchanger or the second economizer.
6. the more tonifying Qi refrigeration heat pump systems of Two-stage Compression according to claim 4, it is characterised in that:
The refrigeration heat pump system further includes the first temperature-detecting device that can be detected in the First Heat Exchanger and can detect institute
State the second temperature detection device in the second heat exchanger, and the refrigeration heat pump system further includes controller, when further include control
When valve (6), the controller can be according to the temperature of first temperature-detecting device and second temperature detection device detection
It controls the control valve to open or close, to execute tonifying Qi twice or a tonifying Qi.
7. a kind of control method of refrigeration heat pump system, it is characterised in that: use the more tonifying Qi of Two-stage Compression as claimed in claim 6
Refrigeration heat pump system, according to the judgement of the temperature relation of two heat exchangers and control system executes tonifying Qi twice or a tonifying Qi.
8. control method according to claim 7, it is characterised in that: include:
Detecting step detects the refrigerant temperature T2 in the second heat exchanger of refrigerant temperature T1 and detection in First Heat Exchanger；
Judgment step, judges whether T1 is greater than T2；
Step is executed, if the judging result of the judgment step is T1 < T2, the control valve controlled in refrigeration heat pump system is closed
It closes, executes the second operational mode of a tonifying Qi.
9. control method according to claim 8, it is characterised in that: include:
The judgment step is also used to judging as T1 > T2, calculate the corresponding lower saturated vapour pressure P1 of T1 and T2 temperature with
P2, and judge whether P1/P2 is greater than n, wherein n is setting value；
The execution step is also used to when judging that P1/P2 is less than n, and the control valve controlled in refrigeration heat pump system is closed, and is held
Second operational mode of tonifying Qi of row；When judging that P1/P2 is greater than n, the control valve controlled in refrigeration heat pump system is opened,
Execute the first operational mode of tonifying Qi twice.
10. a kind of air conditioner, it is characterised in that: including the more tonifying Qi refrigeration of Two-stage Compression of any of claims 1-6
Heat pump system.
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| CN201910616387.6A CN110332635B (en) | 2019-07-09 | 2019-07-09 | Double-stage compression multi-air-supplementing refrigeration heat pump system, control method and air conditioner |
| PCT/CN2020/098488 WO2021004304A1 (en) | 2019-07-09 | 2020-06-28 | Refrigeration/heat pump system having two-stage compression and multiple air suplementations, control method therefor and air conditioner |
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|---|---|---|---|
| CN201910616387.6A CN110332635B (en) | 2019-07-09 | 2019-07-09 | Double-stage compression multi-air-supplementing refrigeration heat pump system, control method and air conditioner |
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| CN111076439A (en) * | 2019-12-11 | 2020-04-28 | 珠海格力电器股份有限公司 | Air supply structure, centrifugal chiller and air conditioner |
| WO2021004304A1 (en) * | 2019-07-09 | 2021-01-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Refrigeration/heat pump system having two-stage compression and multiple air suplementations, control method therefor and air conditioner |
| CN112361646A (en) * | 2020-10-21 | 2021-02-12 | 中国石油大学(华东) | Shunting regulation and control double-circulation coupling type high-temperature heat pump system |
| CN112361660A (en) * | 2020-12-02 | 2021-02-12 | 珠海格力电器股份有限公司 | Heat pump system and method for setting design flow thereof |
| CN112944707A (en) * | 2019-12-10 | 2021-06-11 | 珠海格力电器股份有限公司 | Air conditioning system and control method thereof |
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| WO2021004304A1 (en) | 2021-01-14 |
| CN110332635B (en) | 2024-03-19 |
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