CN109747384A - Parallelly compressed formula CO with regenerative apparatus2Automobile heat pump air-conditioning system - Google Patents
Parallelly compressed formula CO with regenerative apparatus2Automobile heat pump air-conditioning system Download PDFInfo
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- CN109747384A CN109747384A CN201910121025.XA CN201910121025A CN109747384A CN 109747384 A CN109747384 A CN 109747384A CN 201910121025 A CN201910121025 A CN 201910121025A CN 109747384 A CN109747384 A CN 109747384A
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- heat exchanger
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- liquid separator
- evaporator
- gas cooler
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Abstract
A kind of parallelly compressed formula CO with regenerative apparatus2Automobile heat pump air-conditioning system, it include: two coaxially connected parallel screw compressors, gas cooler, outdoor heat exchanger, Intermediate Heat Exchanger, gas-liquid separator, evaporator and fluid reservoir, wherein: the output end of two screw compressors successively with gas cooler, outdoor heat exchanger, Intermediate Heat Exchanger is connected with gas-liquid separator, the gas phase outlet of gas-liquid separator is connected with the input terminal of the second screw compressor, the liquid phase output of gas-liquid separator is successively connected with evaporator and fluid reservoir and passes through Intermediate Heat Exchanger and is connected with the input terminal of the first screw compressor, Intermediate Heat Exchanger promotes the high temperature refrigerant of further cooling gas cooler outflow while suction superheat, it is superimposed with parallelly compressed effect and realizes performance optimization.The present invention uses parallelly compressed scheme, solves CO in refrigeration mode2Refrigerant under high temperature environment efficiency decay the problem of, reduce energy consumption.
Description
Technical field
The present invention relates to a kind of technology in car air-conditioner field, specifically a kind of parallelly compressed formula with regenerative apparatus
CO2Automobile heat pump air-conditioning system.
Background technique
For winter heating, compared with traditional combustion engine automobile, electric car does not have utilizable engine exhaust heat, heat
Pump technology is just popularized more and more on electric car.The usually used refrigerant of air conditioning for automobiles is R134a at present, but it
With very high GWP (global warming potential), and heating performance at low temperature is excessively poor, finds suitable substitution refrigeration
Agent and heat pump techniques are particularly important.
Summary of the invention
The present invention In view of the above shortcomings of the prior art, proposes a kind of parallelly compressed formula CO with regenerative apparatus2Vapour
Vehicle heat pump air conditioning system can not be influenced arbitrary switch refrigeration and heating mode by environment temperature and type of vehicle.
Natural refrigerant R744 can be used in the heat pump system, reduces the influence to environment, and solve the heating under low temperature
Needs of problems, the present invention is achieved by the following technical solutions:
The present invention includes: that coaxially connected two parallel screw compressors, gas cooler, outdoor heat exchanger, centres are changed
Hot device, gas-liquid separator, evaporator and fluid reservoir, in which: the output end of the first screw compressor and the second screw compressor with
The input terminal of gas cooler is connected, and the output end of gas cooler passes through the high input voltage of outdoor heat exchanger and Intermediate Heat Exchanger
End is connected, and the high-voltage output end of Intermediate Heat Exchanger is connected with the input terminal of gas-liquid separator, the gas output end of gas-liquid separator
It is connected with the input terminal of the second screw compressor, the fluid output port of gas-liquid separator is successively connected with evaporator and fluid reservoir,
The output end of fluid reservoir is connected with the low pressure, input end of Intermediate Heat Exchanger, the low-voltage output of Intermediate Heat Exchanger and the first scroll compression
The input terminal of contracting machine is connected, and Intermediate Heat Exchanger promotes the high temperature of further cooling gas cooler outflow while suction superheat
Refrigerant is superimposed with parallelly compressed effect and realizes performance optimization.
The evaporator and gas-liquid separator, gas-liquid separator and Intermediate Heat Exchanger and gas cooler and outdoor heat exchange
It is respectively corresponded between device equipped with first to third electric expansion valve and first to third solenoid valve.
The present invention relates to the cooling and warming switching method of above-mentioned air-conditioning system, by electric expansion valve and electromagnetism Vavle switching,
Heat exchanger variation uses and air door conversion realizes that refrigeration mode and heating mode switch.
The refrigeration mode refers to: the first electric expansion valve and the second electric expansion valve run and pass fluid through twice
Expansion, third electric expansion valve are closed, and the first solenoid valve and third solenoid valve are opened, and second solenoid valve is closed, air door close with
It blocks gas cooler and is not involved in heat exchange, outdoor heat exchanger at this time is as gas cooler.
The heating mode refers to: the operation of third electric expansion valve, remaining electric expansion valve are closed, and second solenoid valve is beaten
It opens, remaining solenoid valve is closed, and air door is opened so that air flows through gas cooler, and outdoor heat exchanger is as evaporator, gas at this time
Liquid/gas separator stores liquid phase refrigerant as fluid reservoir, and the evaporator and fluid reservoir and centre in original refrigeration mode change
Hot device and the first screw compressor do not work, and no fluid participates in circulation.
Technical effect
Compared with prior art, the present invention uses natural environmental-protective refrigerant CO2, conventional refrigerants are alleviated to ozone layer
Destruction and global warming issue.Outstanding contributions of the present invention are to devise novel C O2Heat pump air conditioning system simultaneously illustrates refrigeration
The simple handover operation of heating mode.In refrigeration mode, parallelly compressed scheme is used, solves CO2Refrigerant is in high temperature
The problem of efficiency decays under environment further promotes inventive energy using Intermediate Heat Exchanger, reduces energy consumption, experimental data
Show compared with conventional refrigerant system, refrigeration efficiency promotes 15%-20%.Present system can be subzero between 20 DEG C to 40 DEG C
Efficient operation, temperature range cover Chinese most territories, its application are made not receive territory restriction.
Detailed description of the invention
Fig. 1 is the schematic diagram under the present invention is in refrigeration mode；
Fig. 2 is the pressure-enthalpy chart under the present invention is in refrigeration mode；
Fig. 3 is schematic diagram of the present invention under heating mode；
In figure: heat exchanger fan 1, centrifugal blower 2, evaporator 3, heating mode lower wind door 4, refrigeration mode lower wind door 5, gas
Body cooler 6, wind direction 7, the first electric expansion valve 8, the first solenoid valve 9, fluid reservoir 10, Intermediate Heat Exchanger 11, second solenoid valve
12, the second electric expansion valve 13, low pressure, input end 14, low-voltage output 15, high voltage input terminal 16, high-voltage output end 17, gas-liquid
Separator 18, the first screw compressor 19, the first screw compressor export the 20, first screw compressor entrance 21, second and are vortexed
Compressor outlet 22, the second screw compressor entrance 23, the second screw compressor 24, third electric expansion valve 25, third electromagnetism
Valve 26, outdoor heat exchanger 27.
Specific embodiment
As shown in Figure 1, the present embodiment includes: coaxially connected two parallel screw compressors 19 and 24, gas cooler
6, outdoor heat exchanger 27, Intermediate Heat Exchanger 11, gas-liquid separator 18, evaporator 3 and fluid reservoir 10, in which: the first scroll compression
Machine outlet 20 and the second screw compressor outlet 22 are connected with the input terminal of gas cooler 6, and the output end of gas cooler 6 is logical
It crosses outdoor heat exchanger 27 to be connected with the high voltage input terminal 16 of Intermediate Heat Exchanger 11, the high-voltage output end 17 and gas of Intermediate Heat Exchanger 11
The input terminal of liquid/gas separator 18 is connected, and the gas output end of gas-liquid separator 18 is connected with the second screw compressor entrance 23, gas
The fluid output port of liquid/gas separator 18 is successively connected with evaporator 3 and fluid reservoir 10, the output end of fluid reservoir 10 and intermediate heat exchange
The low pressure, input end 14 of device 11 is connected, and the low-voltage output 15 of Intermediate Heat Exchanger 11 is connected with the first screw compressor entrance 21,
On the one hand Intermediate Heat Exchanger 11 promotes suction superheat, the high temperature refrigerant on the other hand flowing out gas cooler 6 is further
It is cooling, it is superimposed with the effect of parallelly compressed mode, thus lifting system performance.
The evaporator 3 and gas-liquid separator 18, gas-liquid separator 18 and Intermediate Heat Exchanger 11 and gas cooler 6 with
Respectively correspond between outdoor heat exchanger 27 equipped with first to third electric expansion valve 8,13,25 and first to third solenoid valve 9,
12、26。
The outdoor heat exchanger 27 is equipped with fan 1.
The upstream of the evaporator 3 and gas cooler 6 is equipped with centrifugal blower 2, the wind direction 7 such as Fig. 1 of the centrifugal blower 2
With shown in Fig. 3.
Air door 4,5 there are two being set on the air-conditioning box.
The present embodiment in cooling mode, CO2Refrigerant enters fluid reservoir 10 after evaporating in evaporator 3, and fluid is therewith
Enter after high-pressure fluid heat exchange from the low pressure, input end 14 of Intermediate Heat Exchanger 11 and is flowed from the low-voltage output 15 of Intermediate Heat Exchanger 11
Out, then from the first screw compressor entrance 21 enter the first screw compressor 19, exported after compression from the first screw compressor
20 outflows, using gas cooler 6, since gas cooler 6 at this time is blocked by refrigeration mode lower wind door 5 and are not involved in and change
Heat, fluid only flow therethrough, and are flowing into outdoor heat exchanger 27 through third solenoid valve 26 and are being radiated by fan 1, are being changed by outdoor
The fluid that hot device 27 flows out is flowed into from the high voltage input terminal 16 of Intermediate Heat Exchanger 11 and is exchanged heat with after low-pressure fluid heat exchange from centre
The high-voltage output end 17 of device 11 flows out, and subsequent fluid carries out first time throttling, the stream after throttling by the second electric expansion valve 13
Body enters gas-liquid separator 18, and the vapor phase refrigerant after separation is entered and the first scroll compression by the second screw compressor entrance 23
The second screw compressor 24 that machine 19 is run parallel, vapor phase refrigerant flow out simultaneously from the second screw compressor outlet 22 after compression
Converge with the fluid of the first screw compressor 19 outflow, the liquid phase refrigerant after separation then flows through the first solenoid valve 9 and through first
Electric expansion valve 8 carries out second and throttles, and the fluid after throttling is returned in evaporator 3 and is evaporated, in this way, a CO2Vapour
Vehicle refrigeration cycle is completed.
As shown in Fig. 2, A-B-C-K-A on figure indicates no backheat for the system pressure-enthalpy chart under refrigeration mode shown in FIG. 1
The traditional vapor compression cycles of device, A-B-C-D-E-F-A (D-G-H-C) indicate the parallelly compressed formula circulation of no regenerative apparatus,
A-O-P-C-M-N-E-F-A (N-G-H-M) indicates parallelly compressed formula circulation of the present invention with regenerative apparatus.Wherein, A-O indicates stream
Heat transfer process of the body in the low-pressure side of Intermediate Heat Exchanger 11, compression process of the O-P expression fluid in the first screw compressor 19,
G-H indicates compression process of the fluid in the second screw compressor 24, and P-C-M indicates heat exchange of the fluid in outdoor heat exchanger 27
Process and the further cooling procedure in the low-pressure side of Intermediate Heat Exchanger 14, M-N indicate fluid second in electric expansion valve
First time throttling process in 13, E-F indicates second throttling process of the fluid in the first electric expansion valve 8, finally, F-A
Indicate evaporation process of the fluid in evaporator 3.The refrigerating capacity Q of the parallelly compressed circulatory system without regenerative apparatusePass through formula:
Qe=(1-xD)(hA-hF) calculate, wasted work WcPass through formula: Wc=xD(hH-hG)+(1-xD)(hB-hA) calculate, in which: xDFor D point
Mass dryness fraction and its calculation formula isH is the corresponding enthalpy of each point.And then obtain efficiencyCompare tradition
Steam compression cycle A-B-C-K, performance have biggish promotion.In addition, in the parallelly compressed system with regenerative apparatus, from
The high temperature refrigerant that gas cooler comes out throttles again after cooling down with low-temperature refrigerant heat exchange, reduces the mass dryness fraction of D point, such as
Shown in the dotted line of Fig. 2, system performance is further improved.
As shown in figure 3, the present embodiment is in a heating mode, outdoor heat exchanger 27 is used as evaporator, refrigerant suction
Heat of vaporization, gas-liquid separator 18 is as fluid reservoir to store liquid phase refrigerant, CO2It is steamed inside the evaporator of refrigerant at this moment
After hair, fluid reservoir at this time, the second electric expansion valve 13 and first are flowed into Intermediate Heat Exchanger 11, then by second solenoid valve 12
Solenoid valve is all closed, therefore fluid cannot flow through, and is flowed through the second screw compressor 24 by the fluid that fluid reservoir flows out and is compressed, this
When the first screw compressor 19 close, fluid by the second screw compressor 24 flow out after enter gas cooler 6, heat at this time
Mode lower wind door 4 is opened, and air flows through after gas cooler 6 is heated for heating in car hold, is come out from gas cooler 6
Fluid enters throttling by third electric expansion valve 25, and the fluid after throttling is evaporated back to evaporator at this time, in this way,
One CO2Automobile heating circulation is completed.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (9)
1. a kind of parallelly compressed formula CO with regenerative apparatus2Automobile heat pump air-conditioning system characterized by comprising coaxially connected
Two parallel screw compressor, gas cooler, outdoor heat exchanger, Intermediate Heat Exchanger, gas-liquid separator, evaporator and liquid storages
Tank, in which: the output end of two screw compressors successively divides with gas cooler, outdoor heat exchanger, Intermediate Heat Exchanger and gas-liquid
It is connected from device, the gas phase outlet of gas-liquid separator is connected with the input terminal of the second screw compressor, the liquid phase of gas-liquid separator
Output end is successively connected with evaporator and fluid reservoir and passes through Intermediate Heat Exchanger and is connected with the input terminal of the first screw compressor, in
Between heat exchanger further cooling gas cooler outflow while promote suction superheat high temperature refrigerant, with parallelly compressed effect
Performance optimization is realized in fruit superposition.
2. the parallelly compressed formula CO according to claim 1 with regenerative apparatus2Automobile heat pump air-conditioning system, characterized in that institute
The Intermediate Heat Exchanger stated has low pressure side and high pressure side and respectively corresponds to input terminal and output end, in which: low pressure, input end and storage
Flow container is connected, and low-voltage output is connected with the first screw compressor, and high voltage input terminal is connected with outdoor heat exchanger, high-voltage output end
It is connected with gas-liquid separator.
3. the parallelly compressed formula CO according to claim 1 with regenerative apparatus2Automobile heat pump air-conditioning system, characterized in that institute
Between evaporator and gas-liquid separator, gas-liquid separator and Intermediate Heat Exchanger and gas cooler and the outdoor heat exchanger stated respectively
First is correspondingly provided with to third electric expansion valve and first to third solenoid valve.
4. the parallelly compressed formula CO according to claim 1 with regenerative apparatus2Automobile heat pump air-conditioning system, characterized in that institute
The outdoor heat exchanger stated is equipped with fan.
5. the parallelly compressed formula CO according to claim 1 with regenerative apparatus2Automobile heat pump air-conditioning system, characterized in that institute
The upstream of the evaporator and gas cooler stated is equipped with centrifugal blower.
6. the parallelly compressed formula CO according to claim 5 with regenerative apparatus2Automobile heat pump air-conditioning system, characterized in that institute
The air-conditioning box stated is equipped with air door.
7. a kind of cooling and warming switching method based on system described in any of the above-described claim, which is characterized in that pass through electronics
Expansion valve and electromagnetism Vavle switching, heat exchanger variation uses and air door conversion realizes that refrigeration mode and heating mode switch.
8. according to the method described in claim 7, it is characterized in that, the refrigeration mode refers to: the first electric expansion valve and
Two electric expansion valves run and pass fluid through to be expanded twice, and third electric expansion valve is closed, and three solenoid valve of the first solenoid valve is beaten
It opens, second solenoid valve is closed, and air door, which is closed, is not involved in heat exchange to block gas cooler, and outdoor heat exchanger at this time is as gas
Cooler completes automobile refrigerating circulation.
9. according to the method described in claim 7, it is characterized in that, the heating mode refers to: third electric expansion valve operation,
Remaining electric expansion valve is closed, and second solenoid valve is opened, remaining solenoid valve is closed, and air door is opened so that air flows through gas cooling
Device, for outdoor heat exchanger as evaporator, gas-liquid separator stores liquid phase refrigerant as fluid reservoir at this time, completes automobile heating
Circulation, and original evaporator and fluid reservoir and Intermediate Heat Exchanger and the first screw compressor do not work and join without fluid
With circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910121025.XA CN109747384B (en) | 2019-02-19 | 2019-02-19 | Parallel compression type CO2 automobile heat pump air conditioning system with heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910121025.XA CN109747384B (en) | 2019-02-19 | 2019-02-19 | Parallel compression type CO2 automobile heat pump air conditioning system with heat recovery device |
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| CN109747384A true CN109747384A (en) | 2019-05-14 |
| CN109747384B CN109747384B (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910121025.XA Active CN109747384B (en) | 2019-02-19 | 2019-02-19 | Parallel compression type CO2 automobile heat pump air conditioning system with heat recovery device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728799A (en) * | 2020-12-09 | 2021-04-30 | 上海交通大学 | Based on CO2Flash evaporation system of mixed refrigerant |
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| US6205802B1 (en) * | 2000-01-05 | 2001-03-27 | Carrier Corporation | Travel coach air conditioning system |
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