CN109808449B - Ultralow-temperature heat pump air conditioning system of electric automobile - Google Patents
Ultralow-temperature heat pump air conditioning system of electric automobile Download PDFInfo
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- CN109808449B CN109808449B CN201910140366.1A CN201910140366A CN109808449B CN 109808449 B CN109808449 B CN 109808449B CN 201910140366 A CN201910140366 A CN 201910140366A CN 109808449 B CN109808449 B CN 109808449B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 39
- 239000003921 oil Substances 0.000 claims abstract description 58
- 239000010725 compressor oil Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 29
- 239000003507 refrigerant Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000005057 refrigeration Methods 0.000 claims description 18
- 230000001502 supplementing effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000006698 induction Effects 0.000 abstract description 3
- 230000003020 moisturizing effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides an ultralow temperature electric automobile heat pump air conditioning system, including electric compressor, system's adjustment integrated device, the heat exchanger assembly outside the car, the heat exchanger assembly in the car, system's adjustment integrated device establishes middling pressure moisturizing increases enthalpy interface, the compressor induction port, the compressor returns oil opening, the compressor gas vent, heat exchanger assembly interface I in the car, heat exchanger assembly interface II in the car, heat exchanger assembly interface I outside the car, heat exchanger assembly interface II outside the car, middling pressure moisturizing increases enthalpy interface connection compressor middling pressure chamber, the compressor induction port connects the compressor suction line, the compressor returns oil opening and connects the compressor oil pipe, the compressor gas vent is connected the compressor blast pipe, heat exchanger assembly interface I in the car and heat exchanger assembly interface II connect the heat exchanger assembly outside the car in car, heat exchanger assembly interface I outside the car and heat exchanger assembly interface II connect the car. The invention has simple and convenient installation and does not occupy excessive space of the vehicle. The energy consumption of the system is reduced, so that the driving mileage of the vehicle is increased.
Description
Technical Field
The invention relates to the field of automobile air conditioning systems, in particular to an ultralow-temperature electric automobile heat pump air conditioning system.
Background
In a new period, vehicles are continuously developed from traditional automobiles to new energy automobiles, and automobile air conditioning systems are also continuously developed. The compressor, which is a core component of the traditional automobile air conditioning system, depends on an engine as a power source, and the power of the compressor is inexhaustible. The compressors of new energy automobiles are mostly electric compressors, and the compressors depend on the power batteries of the vehicles as energy sources, so that an air conditioning system is an indispensable vehicle part in the use process of the vehicles, especially some middle-high grade electric automobiles. While the traditional automobile warm air is used for heating the space in the automobile by the waste heat of the engine, the best heating mode of the new energy automobile at present is to use PTC heating or PTC water heating, and the mode can shorten the driving mileage of the automobile. Resulting in the end user also often considering whether to add an air conditioning system when selecting an electric car. The air conditioning system of the new energy vehicle is slow in development, mainly uses refrigeration, has few heating functions, and in the few cases, does not lack the existence of a heat pump, the heat pump air conditioner also becomes the happiness of the future automobile air conditioning industry, but the existing vehicle cannot complete modularized integrated design due to vehicle layout, so that each part is scattered in an engine compartment of the vehicle, cannot form integration, and is inconvenient to install, debug and maintain. Under the above circumstances, it is necessary to develop an air conditioning system capable of satisfying the cooling and heating functions and capable of being integrally installed.
Disclosure of Invention
The invention aims to provide an ultralow-temperature heat pump air conditioning system for an electric automobile, which consists of four parts, namely an external heat exchanger assembly, an electric compressor, an internal heat exchanger assembly and a system adjusting integrated device, and the four parts are connected through pipelines, so that the system is simple and convenient to install, does not occupy excessive space of the automobile, and is convenient to maintain. The system adopts the heat pump system, and the heating and the refrigerating of the system adopt the air conditioning system, so that the energy consumption of the system is greatly reduced, and the driving mileage of the vehicle is increased. Compared with air conditioning systems of other factories, the system can avoid the problems of poor low-temperature heating effect, high failure rate of the compressor, frosting of the heat exchanger outside the vehicle and the like, which cannot be started at low temperature.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The utility model provides an ultralow temperature electric automobile heat pump air conditioning system, includes electric compressor, system control integrated device, heat exchanger assembly outside the car, heat exchanger assembly in the car, system control integrated device is equipped with middling pressure air supply and increases enthalpy interface, compressor induction port, compressor oil return port, compressor gas vent, heat exchanger assembly interface I in the car, heat exchanger assembly interface II in the car, heat exchanger assembly interface I outside the car, heat exchanger assembly interface II outside the car, middling pressure air supply and increase enthalpy interface passes through the middling pressure chamber of piping connection electric compressor, the air suction port of compressor connects electric compressor's the pipeline of breathing in, the oil return pipe of electric compressor is connected to the compressor oil return port, the blast pipe of electric compressor is connected to the compressor gas vent, heat exchanger assembly interface I and heat exchanger assembly interface II in the car connect the heat exchanger assembly in the car, heat exchanger assembly interface I outside the car and heat exchanger assembly interface II outside the car connect the car.
The system adjusting integrated device comprises a refrigeration oil separator, a three-position four-way valve, a gas-liquid separator, a plate heat exchanger and a two-position four-way valve, wherein an inlet of the refrigeration oil separator is connected with a compressor exhaust port, one outlet of the refrigeration oil separator is connected with a compressor oil return port, the other outlet of the refrigeration oil separator is connected with an A port of the three-position four-way valve, a B port of the three-position four-way valve is connected with an external heat exchanger assembly interface I, a C port of the three-position four-way valve is connected with an inlet of the gas-liquid separator, a D port of the three-position four-way valve is connected with an internal heat exchanger assembly interface I, and an outlet of the gas-liquid separator is connected with a compressor air suction port; an inlet H of the plate heat exchanger is connected with an E port of the two-position four-way valve through a pipeline, an outlet B of the plate heat exchanger is connected with an F port of the two-position four-way valve, an H port of the two-position four-way valve is simultaneously connected with the other inlet N of the plate heat exchanger and an in-vehicle heat exchanger assembly interface II, an auxiliary expansion valve is arranged on the pipeline of the other inlet N of the plate heat exchanger, the other outlet M of the plate heat exchanger is connected with a medium-pressure air supplementing enthalpy increasing interface through a pipeline, a one-way valve is arranged on a connecting pipeline of the plate heat exchanger and the medium-pressure air supplementing enthalpy increasing interface, and a G port of the two-position four-way valve is connected with the in-vehicle heat exchanger assembly interface II.
A main expansion valve, a liquid viewing mirror, a dryer and a liquid storage tank are sequentially arranged on a pipeline of one inlet H of the plate heat exchanger.
The electric compressor is an electric scroll compressor.
The external heat exchanger assembly is inclined to the driving direction and comprises a collecting pipe, flat pipes and fins, wherein multiple paths of flat pipes are arranged side by side, the upper parts and the lower parts of the multiple paths of flat pipes are communicated through the collecting pipe, and the fins are longitudinally arranged on the flat pipes.
The inclination angle alpha of the heat exchanger assembly outside the vehicle is 2.5-10 degrees.
The number of the flat pipes is 3-5.
An operation method of an ultralow temperature electric automobile heat pump air conditioning system comprises the following steps:
1) The refrigerating flow of the system is as follows: the electric compressor enters the system adjusting integrated device through the exhaust pipe, the refrigerating oil separator enables refrigerating oil existing in the exhaust gas to enter the electric compressor through an oil return pipe, at the moment, the end A-end B of the three-position four-way valve is communicated with the end C-end D of the three-position four-way valve, the refrigerant enters the external heat exchanger assembly through the system adjusting integrated device, after the external heat exchanger assembly performs heat exchange, the refrigerant returns to the system adjusting integrated device, at the moment, the end G-end E of the two-position four-way valve is communicated with the end F-end H of the two-position four-way valve, the refrigerant enters the internal heat exchanger assembly through adjustment and conversion, after the internal heat exchanger assembly performs heat exchange, the refrigerant enters the system adjusting integrated device, and finally returns to the electric compressor through the gas-liquid separator;
2) The low temperature heating flow process of the system is as follows: the electric compressor enters the system adjusting integrated device through the exhaust pipe, the refrigerating oil separator enables refrigerating oil existing in the exhaust gas to enter the electric compressor through an oil return pipe, at the moment, the end A-end D of the three-position four-way valve is communicated with the end C-end B of the three-position four-way valve, the refrigerant enters the heat exchanger assembly in the vehicle through the system adjusting integrated device, after heat exchange of the heat exchanger assembly in the vehicle, the refrigerant returns to the system adjusting integrated device, at the moment, the end H-end E of the two-position four-way valve is communicated with the end F-end G of the two-position four-way valve, the refrigerating oil enters the heat exchanger assembly outside the vehicle through adjusting conversion, after heat exchange of the heat exchanger assembly outside the vehicle, the refrigerating oil enters the system adjusting integrated device, and finally returns to the electric compressor through the gas-liquid separator;
under the condition of low temperature of 0 ℃ to-20 ℃, the auxiliary expansion valve is opened to supplement pressure for the medium pressure cavity of the electric compressor;
3) The system start-up flow is as follows: when the system is just started, the electric compressor enters the system adjusting integrated device through the exhaust pipe, the end A-end C of the three-position four-way valve is communicated, oil is returned from the oil return pipe through the refrigeration oil separator and the gas-liquid separator respectively, the refrigerant is returned from the suction pipe, and the refrigerant in the other pipes does not flow.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention can provide air conditioning functions such as refrigeration, heating, fresh air changing and the like for the space in the vehicle. The compressor has a medium-pressure air supplementing function, and an air supplementing adjusting module on the integrated device is combined with the system adjusting device, so that the state of the refrigerant at low temperature can be effectively compensated in a medium-pressure air supplementing mode.
2) The system adjusting integrated device has the functions of refrigerating, heating, air suction, air supplementing, and the like. The integrated regulating device can be used for effectively solving the problems of vibration and noise of the electric compressor during starting, thereby prolonging the service life of the electric compressor.
3) The heat pump air conditioning system can perform heating operation at the low temperature of minus 20 ℃ and cooling operation at the high temperature of 60 ℃. The refrigerating capacity can be 2-8KW, and the heating capacity can be 1.5-7.5KW. The invention can effectively improve the COP value of heating or refrigerating by more than 20%, reduce the energy consumption of the vehicle by more than 29%, and increase the driving mileage of the new energy automobile by 10-15%.
4) The external heat exchanger assembly has a defrosting structure, and can prevent the external heat exchanger from frosting or icing at low temperature, thereby effectively improving the heating and refrigerating efficiency. And the refrigerant flow of the heat exchanger assembly outside the vehicle is only three paths, so that the flow resistance of the refrigerant in the heat exchanger can be reduced.
5) The invention can effectively improve the refrigerating capacity, heating capacity, fresh air and the like required by the vehicle, and the air state required by the vehicle parts during running and personnel driving. Low cost and low price, and benefits more users.
Drawings
Fig. 1 is a schematic diagram of a heat pump air conditioning system for an ultralow temperature electric vehicle according to the present invention.
Fig. 2 is a schematic refrigeration diagram of a heat pump air conditioning system of an ultralow temperature electric vehicle according to the present invention.
Fig. 3 is a schematic diagram of low-temperature heating of the heat pump air conditioning system of the ultralow-temperature electric automobile.
Fig. 4 is a schematic starting diagram of a heat pump air conditioning system of an ultralow temperature electric vehicle according to the present invention.
FIG. 5 is a schematic diagram of the installation of an extra-vehicular heat exchanger assembly of an ultra-low temperature electric vehicle heat pump air conditioning system of the present invention.
Fig. 6 is a schematic diagram of an external heat exchanger of a heat pump air conditioning system of an ultralow temperature electric vehicle.
Fig. 7 is a flow chart of an external heat exchanger of the heat pump air conditioning system of the ultralow temperature electric automobile.
Fig. 8 is a schematic diagram of a system adjustment integrated device of the heat pump air conditioning system of the ultralow temperature electric automobile.
Fig. 9 is a first axial side view of a system adjusting and integrating device of the heat pump air conditioning system of the ultralow temperature electric automobile.
Fig. 10 is a second axial side view of a system adjusting and integrating device of the heat pump air conditioning system of the ultralow temperature electric automobile.
In the figure: 1-system adjusting integrated device, 2-first pipeline, 3-external heat exchanger assembly, 4-second pipeline, 5-third pipeline, 6-exhaust pipe, 7-oil return pipe, 8-air suction pipeline, 9-three-position four-way valve, 10-air supplementing pipeline, 11-electric compressor, 12-internal heat exchanger assembly, 13-fourth pipeline, 14-inlet and outlet pressing block I, 15-collecting pipe, 16-flat pipe, 17-fin, 18-inlet and outlet pressing block II, 19-low pressure filling port, 20-low pressure switch, 21-main expansion valve, 22-liquid viewing mirror, 23-dryer, 24-liquid storage tank, 25-two-position four-way valve, 26-auxiliary expansion valve, 27-plate heat exchanger, 28-one-way valve, 29-auxiliary expansion valve detection device, 30-main expansion valve detection device, 31-gas-liquid separator, 32-refrigeration oil separator, 33-high pressure switch and 34-high pressure filling port; ① The middle-pressure air supplementing and enthalpy increasing interface is characterized in that a compressor air suction port is ②, a compressor oil return port is ③, a compressor exhaust port is ④, an in-vehicle heat exchanger assembly interface I is ⑤, an out-vehicle heat exchanger assembly interface I is ⑥, an out-vehicle heat exchanger assembly interface II is ⑦, and an in-vehicle heat exchanger assembly interface II is ⑧.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings:
As shown in fig. 1-10, an ultralow temperature electric automobile heat pump air conditioning system comprises an electric compressor 11, a system adjusting integrated device 1, an external heat exchanger assembly 3 and an internal heat exchanger assembly 12, wherein the system adjusting integrated device 1 is provided with a medium-pressure air supplementing enthalpy increasing interface ①, a compressor air suction port ②, a compressor oil return port ③, a compressor air exhaust port ④, an internal heat exchanger assembly interface i ⑤, an internal heat exchanger assembly interface ii ⑧, an external heat exchanger assembly interface i ⑥ and an external heat exchanger assembly interface ii ⑦, the medium-pressure air supplementing enthalpy increasing interface ① is connected with a medium-pressure cavity of the electric compressor through a pipeline, the compressor air suction port ② is connected with an air suction pipeline 8 of the electric compressor, the compressor oil return port 2 is connected with an oil return pipe 7 of the electric compressor, the compressor air exhaust port ④ is connected with an exhaust pipe 6 of the electric compressor, the internal heat exchanger assembly interface i ⑤ and the internal heat exchanger assembly interface ii ⑧ are connected with the internal heat exchanger assembly 12, and the external heat exchanger assembly i ⑦ is connected with the external heat exchanger assembly interface i 3.
The system adjusting integrated device 1 comprises a refrigerating oil separator 32, a three-position four-way valve 9, a gas-liquid separator 31, a plate heat exchanger 27 and a two-position four-way valve 25, wherein an inlet of the refrigerating oil separator 32 is connected with a compressor exhaust port ④, one outlet of the refrigerating oil separator 32 is connected with a compressor oil return port ③, the other outlet of the refrigerating oil separator 32 is connected with an A port of the three-position four-way valve 9, a B port of the three-position four-way valve 9 is connected with an external heat exchanger assembly interface I ⑥, a C port of the three-position four-way valve 9 is connected with an inlet of the gas-liquid separator 31, a D port of the three-position four-way valve 9 is connected with an internal heat exchanger assembly interface I ⑤, and an outlet of the gas-liquid separator 31 is connected with a compressor air suction port ②; an inlet H of the plate heat exchanger 27 is connected with an E port of the two-position four-way valve 25 through a pipeline, an outlet B of the plate heat exchanger 27 is connected with an F port of the two-position four-way valve 25, an H port of the two-position four-way valve 25 is simultaneously connected with the other inlet N of the plate heat exchanger 27 and an in-vehicle heat exchanger assembly interface II ⑧, a secondary expansion valve 26 is arranged on a pipeline of the other inlet N of the plate heat exchanger 27, the other outlet M of the plate heat exchanger 27 is connected with the medium-pressure air-supplementing enthalpy-increasing interface ① through a pipeline, a one-way valve 28 is arranged on a connecting pipeline of the plate heat exchanger 27 and the medium-pressure air-supplementing enthalpy-increasing interface ①, and a G port of the two-position four-way valve 25 is connected with an out-vehicle heat exchanger assembly interface II ⑦.
A main expansion valve 21, a liquid viewing mirror 22, a dryer 23 and a liquid storage tank 24 are sequentially arranged on a pipeline of one inlet H of the plate heat exchanger 27.
The electric compressor 11 is an electric scroll compressor.
The external heat exchanger assembly 3 is inclined to the driving direction and comprises a collecting pipe 15, flat pipes 16 and fins 17, a plurality of paths of flat pipes 16 are arranged side by side, the upper parts and the lower parts of the plurality of paths of flat pipes 16 are communicated through the collecting pipe 15, and the fins 17 are longitudinally arranged on the flat pipes 16.
The inclination angle alpha of the heat exchanger assembly 3 outside the vehicle is 2.5-10 degrees.
The number of the flat tubes 16 is 3-5.
The existing vehicle-mounted air conditioning system has the defects that the heat dissipation of the heat exchanger is affected due to frosting or icing of the heat exchanger outside the vehicle, and the heating efficiency is low at low temperature. The invention effectively avoids the problem through the reconstruction of the self structure and the installation angle of the external heat exchanger assembly 3. The outer heat exchanger assembly 3 of car is installed in the direction of driving obliquely, and the installation angle is 2.5-10, and radiating fins 17 are vertically arranged simultaneously, and the above two structural characteristics can make condensate on flat tube 16 flow downwards freely, prevent the outer heat exchanger of car frosting or icing under low temperature to effectual heating and refrigerating efficiency that has improved.
The heat exchanger has poor heat dissipation effect and low system oil return rate, can cause frequent occurrence of compressor faults and influence the service life of the compressor, and the system adjustment integrated device 1 provided by the invention is provided with the oil return adjustment module (refrigerating oil separator) based on the problems, so that the problems can be prevented from occurring and the refrigerating capacity can be improved.
The in-vehicle heat exchanger assembly 12 may be a conventional HVAC assembly or other device incorporating an in-vehicle heat exchanger.
The low pressure filler 19 and the low pressure switch 20 are provided in the inlet line of the gas-liquid separator 31, and the main expansion valve detection device 30 including a pressure sensor (YCQB H10) and a temperature sensor (NTC 5kΩ) is provided in the outlet line of the gas-liquid separator, and the main expansion valve detection device 30 is selected because it is closer to the compressor and is the suction port of the compressor.
The auxiliary expansion valve detecting means 29 comprising a pressure sensor (YCQB H10) and a temperature sensor (NTC 5kΩ) is provided on the inlet line of the check valve 28. When the low-temperature air supply is performed, the auxiliary expansion valve 26 is adjusted with the aid of the auxiliary expansion valve detection device 29, and the auxiliary expansion valve 26 is closed in other states.
A high-pressure filler 34 and a high-pressure switch 33 are provided on the connection line between the refrigeration oil separator 32 and the three-position four-way valve 9. The model of the refrigeration oil separator is H-W55824. The refrigerating oil separator 32 can reduce the oil content in the air conditioning system, increase the refrigerating capacity and heating capacity of the system, and maximally increase the refrigerating effect.
An operation method of an ultralow temperature electric automobile heat pump air conditioning system comprises the following steps:
1) The refrigerating flow of the system is as follows: the electric compressor 11 enters the system adjusting integrated device 1 through the exhaust pipe 6, the refrigerating oil separator 32 enables refrigerating oil existing in the exhaust gas to enter the electric compressor 11 through the oil return pipe 7, at the moment, the end A-end B and the end C-end D of the three-position four-way valve 9 are communicated, the refrigerant flows through the second pipeline 4 through the system adjusting integrated device 1 to enter the external heat exchanger assembly 3, after the external heat exchanger assembly 3 performs heat exchange, the refrigerant returns to the system adjusting integrated device 1 through the first pipeline 2, at the moment, the end G-end E and the end F-end H of the two-position four-way valve 25 are communicated, the refrigerating oil enters the internal heat exchanger assembly 12 through the fourth pipeline 13 after the internal heat exchanger assembly 12 performs heat exchange, the refrigerating oil enters the system adjusting integrated device 1 through the third pipeline 5, and finally returns to the electric compressor 11 through the air-liquid separator 31 through the air suction pipeline 8; the above process is a circulation, and the continuous circulation is a refrigeration mode;
2) The low temperature heating flow process of the system is as follows: the electric compressor 11 enters the system adjustment integrated device 1 through the exhaust pipe 6, the refrigerating oil separator 32 enables refrigerating oil existing in exhaust gas to enter the electric compressor 11 through the oil return pipe 7, at the moment, the end A-end D of the three-position four-way valve 9 is communicated with the end C-end B of the electric compressor, the refrigerant flows through the third pipeline 5 through the system adjustment integrated device 1 to enter the in-vehicle heat exchanger assembly 12, after heat exchange of the in-vehicle heat exchanger assembly 12, the refrigerant returns to the system adjustment integrated device 1 through the fourth pipeline 13, at the moment, the end H-end E of the two-position four-way valve 25 is communicated with the end F-end G of the electric compressor, after heat exchange of the out-vehicle heat exchanger assembly 3, the refrigerating oil enters the system adjustment integrated device 1 through the second pipeline 4 again, and finally returns to the electric compressor 11 through the air suction pipeline 8 through the air-liquid separator 31;
The pressure of the medium pressure cavity of the electric compressor 11 is required to be supplemented at a low temperature (0 ℃ to-20 ℃), and the auxiliary expansion valve 26 is opened to supplement the pressure of the medium pressure cavity of the electric compressor 11 so as to ensure the normal operation of the electric compressor 11. The air supplementing is carried out to the electric compressor 11 through the air supplementing pipeline 10; the air supplementing mode is only limited to be used in low-temperature heating.
3) The system start-up flow is as follows: when the system is just started, the electric compressor 11 enters the system adjusting integrated device 1 through the exhaust pipe 6, the end A-C of the three-position four-way valve 9 is communicated, oil is returned from the oil return pipe 7 through the refrigeration oil separator 32 and the gas-liquid separator 31 respectively, the refrigerant is returned from the suction pipe 8, and the rest pipes do not have refrigerant flowing. The soft start of the electric compressor 11 can be completed, and the electric compressor 11 can be ensured to be normally started in a low-temperature state.
Claims (6)
1. The heat pump air conditioning system of the ultralow temperature electric automobile is characterized by comprising an electric compressor, a system adjusting integrated device, an external heat exchanger assembly and an internal heat exchanger assembly, wherein the system adjusting integrated device is provided with a medium-pressure air supplementing enthalpy increasing interface, a compressor air suction port, a compressor oil return port, a compressor air exhaust port, an internal heat exchanger assembly interface I, an internal heat exchanger assembly interface II, an external heat exchanger assembly interface I and an external heat exchanger assembly interface II;
The external heat exchanger assembly is inclined to the driving direction, and the inclination angle alpha of the external heat exchanger assembly is 2.5-10 degrees;
The system adjusting integrated device comprises a refrigeration oil separator, a three-position four-way valve, a gas-liquid separator, a plate heat exchanger and a two-position four-way valve, wherein an inlet of the refrigeration oil separator is connected with a compressor exhaust port, one outlet of the refrigeration oil separator is connected with a compressor oil return port, the other outlet of the refrigeration oil separator is connected with an A port of the three-position four-way valve, a B port of the three-position four-way valve is connected with an external heat exchanger assembly interface I, a C port of the three-position four-way valve is connected with an inlet of the gas-liquid separator, a D port of the three-position four-way valve is connected with an internal heat exchanger assembly interface I, and an outlet of the gas-liquid separator is connected with a compressor air suction port; an inlet H of the plate heat exchanger is connected with an E port of the two-position four-way valve through a pipeline, an outlet B of the plate heat exchanger is connected with an F port of the two-position four-way valve, an H port of the two-position four-way valve is simultaneously connected with the other inlet N of the plate heat exchanger and an in-vehicle heat exchanger assembly interface II, an auxiliary expansion valve is arranged on the pipeline of the other inlet N of the plate heat exchanger, the other outlet M of the plate heat exchanger is connected with a medium-pressure air supplementing enthalpy increasing interface through a pipeline, a one-way valve is arranged on a connecting pipeline of the plate heat exchanger and the medium-pressure air supplementing enthalpy increasing interface, and a G port of the two-position four-way valve is connected with the in-vehicle heat exchanger assembly interface II.
2. The heat pump air conditioning system of an ultralow temperature electric automobile according to claim 1, wherein a main expansion valve, a liquid viewing mirror, a dryer and a liquid storage tank are sequentially arranged on a pipeline of one inlet H of the plate heat exchanger.
3. The ultra-low temperature electric automobile heat pump air conditioning system of claim 1, wherein the electric compressor is an electric scroll compressor.
4. The heat pump air conditioning system of an ultralow temperature electric automobile according to claim 1, wherein the external heat exchanger assembly comprises a collecting pipe, flat pipes and fins, a plurality of flat pipes are arranged side by side, the upper parts and the lower parts of the flat pipes are communicated through the collecting pipe, and the fins are longitudinally arranged on the flat pipes.
5. The ultralow temperature electric vehicle heat pump air conditioning system according to claim 4, wherein the flat pipe is 3-5 paths.
6. A method of operating the heat pump air conditioning system for an ultra-low temperature electric vehicle according to any one of claims 1 to 5, comprising the steps of:
1) The refrigerating flow of the system is as follows: the electric compressor enters the system adjusting integrated device through the exhaust pipe, the refrigerating oil separator enables refrigerating oil existing in the exhaust gas to enter the electric compressor through an oil return pipe, at the moment, the end A-end B of the three-position four-way valve is communicated with the end C-end D of the three-position four-way valve, the refrigerant enters the external heat exchanger assembly through the system adjusting integrated device, after the external heat exchanger assembly performs heat exchange, the refrigerant returns to the system adjusting integrated device, at the moment, the end G-end E of the two-position four-way valve is communicated with the end F-end H of the two-position four-way valve, the refrigerant enters the internal heat exchanger assembly through adjustment and conversion, after the internal heat exchanger assembly performs heat exchange, the refrigerant enters the system adjusting integrated device, and finally returns to the electric compressor through the gas-liquid separator;
2) The low temperature heating flow process of the system is as follows: the electric compressor enters the system adjusting integrated device through the exhaust pipe, the refrigerating oil separator enables refrigerating oil existing in the exhaust gas to enter the electric compressor through an oil return pipe, at the moment, the end A-end D of the three-position four-way valve is communicated with the end C-end B of the three-position four-way valve, the refrigerant enters the heat exchanger assembly in the vehicle through the system adjusting integrated device, after heat exchange of the heat exchanger assembly in the vehicle, the refrigerant returns to the system adjusting integrated device, at the moment, the end H-end E of the two-position four-way valve is communicated with the end F-end G of the two-position four-way valve, the refrigerating oil enters the heat exchanger assembly outside the vehicle through adjusting conversion, after heat exchange of the heat exchanger assembly outside the vehicle, the refrigerating oil enters the system adjusting integrated device, and finally returns to the electric compressor through the gas-liquid separator;
under the condition of low temperature of 0 ℃ to-20 ℃, the auxiliary expansion valve is opened to supplement pressure for the medium pressure cavity of the electric compressor;
3) The system start-up flow is as follows: when the system is just started, the electric compressor enters the system adjusting integrated device through the exhaust pipe, the end A-end C of the three-position four-way valve is communicated, oil is returned from the oil return pipe through the refrigeration oil separator and the gas-liquid separator respectively, the refrigerant is returned from the suction pipe, and the refrigerant in the other pipes does not flow.
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| CN201910140366.1A CN109808449B (en) | 2019-02-26 | 2019-02-26 | Ultralow-temperature heat pump air conditioning system of electric automobile |
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| CN201910140366.1A CN109808449B (en) | 2019-02-26 | 2019-02-26 | Ultralow-temperature heat pump air conditioning system of electric automobile |
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| CN109808449A CN109808449A (en) | 2019-05-28 |
| CN109808449B true CN109808449B (en) | 2024-04-26 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202119165U (en) * | 2011-06-02 | 2012-01-18 | 中国科学院广州能源研究所 | Parallel flow heat exchanger for heat pump type electromobile air conditioner |
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| CN202119165U (en) * | 2011-06-02 | 2012-01-18 | 中国科学院广州能源研究所 | Parallel flow heat exchanger for heat pump type electromobile air conditioner |
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| CN109808449A (en) | 2019-05-28 |
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