CN223327288U - Passenger car air conditioning system using carbon dioxide refrigerant - Google Patents
Passenger car air conditioning system using carbon dioxide refrigerantInfo
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- CN223327288U CN223327288U CN202422665498.5U CN202422665498U CN223327288U CN 223327288 U CN223327288 U CN 223327288U CN 202422665498 U CN202422665498 U CN 202422665498U CN 223327288 U CN223327288 U CN 223327288U
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Abstract
本实用新型提供了一种用二氧化碳制冷剂的客车空调系统，属于纯电动客车空调技术领域，包括压缩机，所述压缩机的出口孔连接电磁三通换向阀的进口，所述电磁三通换向阀的第二出口连接蒸发器芯体的高压侧；蒸发器芯体的低压侧分别连接第二电磁阀的进口与高压控制阀的进口，高压控制阀的出口分别连接闪蒸阀的进口和板式换热器的第一进口，其中闪蒸阀的出口与第二电磁阀的出口以及第三电磁阀的出口均与气液分离器的进口相连，气液分离器的出口连接板式换热器的第二进口，板式换热器的第二出口连接压缩机的进口。本实用新型能够降低压缩机出口压力与温度，提高空调系统的制热效率。
The present utility model provides a passenger bus air conditioning system using carbon dioxide refrigerant, belonging to the technical field of pure electric passenger bus air conditioning. The system includes a compressor, wherein the compressor outlet is connected to the inlet of an electromagnetic three-way reversing valve, the second outlet of which is connected to the high-pressure side of an evaporator core; the low-pressure side of the evaporator core is respectively connected to the inlet of a second electromagnetic valve and the inlet of a high-pressure control valve; the outlet of the high-pressure control valve is respectively connected to the inlet of a flash valve and the first inlet of a plate heat exchanger; the outlet of the flash valve, the outlet of the second electromagnetic valve, and the outlet of the third electromagnetic valve are all connected to the inlet of a gas-liquid separator; the outlet of the gas-liquid separator is connected to the second inlet of the plate heat exchanger, and the second outlet of the plate heat exchanger is connected to the inlet of the compressor. The utility model can reduce the compressor outlet pressure and temperature, thereby improving the heating efficiency of the air conditioning system.
Description
Technical Field
The utility model belongs to the technical field of air conditioners of pure electric buses, and particularly relates to a bus air conditioning system using a carbon dioxide refrigerant.
Background
The pure electric bus can be utilized due to the fact that no engine waste heat is available, the air conditioning heat pump operation method of the pure electric bus at the present stage mainly depends on the PTC heater or the air conditioning heat pump to enable the bus to be heated in winter, the PTC heater cannot be more than 1, so that the vehicle is reduced in the winter range, the air conditioning heat pump operation can not meet the heating requirement in the ultralow temperature environment due to the fact that the R410A or R407C refrigerant is used for operation, and environmental protection is affected.
Carbon dioxide (CO 2) does not destroy an ozone layer (odp=0), has extremely low greenhouse gas effect (gwp=1), is nontoxic and nonflammable, has the advantages of good heat transfer performance, low flow resistance, large unit refrigerating capacity and the like, and is used as a refrigerant in the pure electric bus air conditioning system at present.
However, in an air conditioning system using a carbon dioxide refrigerant, a transcritical cycle system is required, and if the outlet pressure of the compressor is high and the temperature is high, the heat exchange capacity of the cooler (condenser) is insufficient, the heating efficiency of the carbon dioxide air conditioning system is affected.
Disclosure of utility model
Aiming at the defects or shortcomings in the prior art, the utility model provides a passenger car air conditioning system using a carbon dioxide refrigerant, which can reduce the outlet pressure and the temperature of a compressor and improve the heating efficiency of the air conditioning system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The embodiment of the utility model provides a passenger car air conditioning system using carbon dioxide refrigerant, which comprises a compressor, wherein an outlet hole of the compressor is connected with an inlet of an electromagnetic three-way reversing valve, and a second outlet of the electromagnetic three-way reversing valve is connected with a high-pressure side of an evaporator core body;
The low pressure side of the evaporator core body is respectively connected with the inlet of the second electromagnetic valve and the inlet of the high pressure control valve, the outlet of the high pressure control valve is respectively connected with the inlet of the flash valve and the first inlet of the plate heat exchanger, the outlet of the flash valve is connected with the outlet of the second electromagnetic valve and the outlet of the third electromagnetic valve, the outlet of the gas-liquid separator is connected with the second inlet of the plate heat exchanger, and the second outlet of the plate heat exchanger is connected with the inlet of the compressor.
Further, the first outlet of the electromagnetic three-way reversing valve is connected with the high-pressure side of the condenser core, the low-pressure side of the condenser core is connected with the inlet of the first electromagnetic valve and the inlet of the third electromagnetic valve respectively, the outlet of the third electromagnetic valve is connected with the inlet of the gas-liquid separator, the outlet of the first electromagnetic valve is sequentially connected with the first drying filter and the first expansion valve, and the outlet of the first expansion valve and the second outlet of the electromagnetic three-way reversing valve are both connected with the high-pressure side of the evaporator core.
Further, the first outlet of the plate heat exchanger is connected with the inlet of the second dry filter, the outlet of the second dry filter is connected with the inlet of the second expansion valve, and the outlet of the second expansion valve is connected with the inlet of the condenser core.
Further, a high-pressure relief valve is arranged on a pipeline between the outlet of the compressor and the electromagnetic three-way reversing valve.
Further, a low-pressure relief valve is arranged on a pipeline between the inlet of the compressor and the second outlet of the plate heat exchanger.
Further, a condensing fan is arranged on one side of the condenser core body, and the condenser core body and the condensing fan are both positioned on the outer side of the carriage.
Further, an evaporation fan is arranged on the outer side of the evaporator core body, and the evaporator core body and the evaporation fan are both positioned on the inner side of the carriage.
Further, a plurality of evaporator cores are arranged, and the plurality of evaporator cores are uniformly distributed in the carriage of the passenger car.
Further, the compressor is an electrically driven variable frequency compressor.
Further, the refrigerant circulating in the system is carbon dioxide.
Compared with the prior art, the utility model has the beneficial effects that:
According to the utility model, the outlet of the evaporator core body is connected with the flash valve through the high-pressure control valve, and the refrigerant is converted from medium temperature and high pressure to low temperature and low pressure when passing through the flash valve, so that the pressure and temperature of the outlet of the compressor can be effectively reduced, the heating efficiency of an air conditioning system is improved, and the efficiency of a carbon dioxide transcritical system is improved.
Drawings
FIG. 1 is a schematic diagram of an air conditioning system for a passenger car in an embodiment of the utility model;
1, a compressor; 2, an electromagnetic three-way reversing valve, 3, a condenser core body, 4, a condensing fan, 5, a first electromagnetic valve, 6, a third electromagnetic valve, 7, a first dry filter, 8, a first expansion valve, 9, an evaporator core body, 10, an evaporating fan, 11, a second electromagnetic valve, 12, a high-pressure control valve, 13, a flash evaporation valve, 14, a plate heat exchanger, 15, a gas-liquid separator, 16, a second dry filter, 17 and a second expansion valve.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
In an exemplary embodiment of the present utility model, as shown in fig. 1, a passenger car air conditioning system using carbon dioxide refrigerant includes a compressor 1, an outlet hole of the compressor 1 is connected to an inlet of an electromagnetic three-way reversing valve 2, a first outlet of the electromagnetic three-way reversing valve 2 is connected to a high pressure side of a condenser core 3, a condensing fan 4 is disposed on one side of the condenser core 3 to dissipate heat of the condenser core 3, the condenser core 3 and the condensing fan 4 are both located outside a passenger car, a low pressure side of the condenser core 3 is respectively connected to an inlet of a first electromagnetic valve 5 and an inlet of a third electromagnetic valve 6, an outlet of the first electromagnetic valve 5 is connected to an inlet of a first desiccation filter 7, an outlet of the first desiccation filter 7 is connected to an inlet of a first expansion valve 8, an outlet of the first expansion valve 8 and a second outlet of the electromagnetic three-way reversing valve 2 are both connected to a high pressure side of an evaporator core 9, an evaporator fan 10 is disposed outside the evaporator core 9, and a temperature of the evaporator core 9 is fed into the interior by the evaporator fan 10 so as to cool or warm the interior of the passenger car, and the evaporator core 9 and the evaporator fan 10 are both located inside the passenger car.
The low pressure side of the evaporator core 9 is respectively connected with the inlet of the second electromagnetic valve 11 and the inlet of the high pressure control valve 12, the outlet of the high pressure control valve 12 is respectively connected with the inlet of the flash valve 13 and the first inlet of the plate heat exchanger 14, medium-temperature high-pressure refrigerant respectively flows into the first inlet of the plate heat exchanger 14 and the flash valve 13, the outlet of the second electromagnetic valve 11 and the outlet of the third electromagnetic valve 6 are both connected with the inlet of the gas-liquid separator 15, the outlet of the gas-liquid separator 15 is connected with the second inlet of the plate heat exchanger 14, the second outlet of the plate heat exchanger 14 is connected with the inlet of the compressor 1, and the compressor 1 can be prevented from sucking liquid refrigerant in a low temperature environment by arranging the gas-liquid separator 15, so that the compressor 1 is in liquid impact, and the compressor 1 is damaged.
The high-pressure control valve 12 is arranged to convert the medium-temperature high-pressure liquid into a medium-temperature medium-pressure gas-liquid mixture, and the medium-temperature high-pressure liquid is converted into pure gas after passing through the flash valve 13 to supplement the gas for the compressor 1, so that the damage caused by the liquid entering the compressor 1 is effectively avoided, and the efficiency of a carbon dioxide transcritical system is improved.
The first outlet of the plate heat exchanger 14 is connected to the inlet of the second filter drier 16, the outlet of the second filter drier 16 is connected to the inlet of the second expansion valve 17, and the outlet of the second expansion valve 17 is connected to the inlet of the condenser core 3.
The evaporator cores 9 are arranged in a plurality, and the evaporator cores 9 are uniformly distributed in the passenger car, so that the air conditioning, refrigerating and heating effects in the passenger car are ensured.
A high-pressure relief valve (not shown in the figure) is arranged on a pipeline between the outlet of the compressor 1 and the electromagnetic three-way reversing valve 2, a low-pressure relief valve (not shown in the figure) is arranged on a pipeline between the inlet of the compressor 1 and the second outlet of the plate heat exchanger 14, and extreme phenomena such as explosion caused by overhigh pressure of the system are prevented by arranging the high-pressure relief valve and the low-pressure relief valve.
The compressor 1 is an electrically driven variable frequency compressor, the refrigerant circulating in the system is carbon dioxide, and the natural environment-friendly carbon dioxide refrigerant is used, so that the problem of low heating efficiency of the pure electric bus in winter can be solved.
During refrigeration circulation, high-temperature and high-pressure gas from the compressor 1 flows into the condenser core 3 for cooling after passing through the electromagnetic three-way reversing valve 2, the condensing fan 4 dissipates heat to the environment, the first electromagnetic valve 5 is opened, the third electromagnetic valve 6 is closed, the air enters the first expansion valve 8 after passing through the first drying filter 7, the air enters the evaporator core 9 for evaporation after throttling and cooling, the cooled air is sent into the carriage for cooling under the action of the evaporating fan 10, the refrigeration function of the air conditioning system is realized, the second electromagnetic valve 11 is opened, the high-pressure control valve 12 is closed, the second expansion valve 17 is closed, low-temperature and low-pressure refrigerant from the evaporator core 9 enters the gas-liquid separator 15, and then returns to the compressor 1 through the second inlet and the second outlet of the plate heat exchanger 14, so that the refrigeration circulation of the air conditioner is completed, and the plate heat exchanger 14 is only used as an air conditioning pipeline.
During heating circulation, high-temperature and high-pressure gas from the compressor 1 flows into the evaporator core 9 through the electromagnetic three-way reversing valve 2 for cooling, the temperature in a carriage rises under the action of the evaporating fan 10, the heating requirement of an air conditioning system is further met, the second electromagnetic valve 11 is closed, the high-pressure control valve 12 is opened, medium-temperature and high-pressure refrigerant flows into the first inlet and the flash valve 13 of the plate heat exchanger 14 respectively, one path of refrigerant flows out of the first outlet of the plate heat exchanger 14, flows into the condenser core 3 through the second drying filter 16 and the second expansion valve 17 respectively, is supercooled through the condenser core 3, is condensed by the condensing fan 4, the first electromagnetic valve 5 is closed, the third electromagnetic valve 6 is opened, the refrigerant flows into the third electromagnetic valve 6 and then is converged with the refrigerant flowing out of the flash valve 13, flows into the gas-liquid separator 15 together, and after the temperature rise of the refrigerant is achieved by the plate heat exchanger 14, the refrigerant returns to the compressor 1 for air suction, and the heating circulation is completed.
When passing through the flash valve 13, a part of refrigerant is converted from medium temperature and high pressure to low temperature and low pressure, so that the pressure and temperature of the discharge outlet of the compressor 1 can be effectively reduced, the heating efficiency of an air conditioning system is improved, and the efficiency of a carbon dioxide transcritical system is improved.
The heating efficiency of the air conditioning system can be improved through the arrangement of the high-pressure control valve 12 and the flash valve 13, the high-pressure control valve 12 can convert medium-temperature high-pressure liquid into medium-temperature medium-pressure gas-liquid mixture, the medium-temperature high-pressure liquid is converted into pure gas after passing through the flash valve 13, the gas is supplemented to the compressor 1, damage caused by liquid entering the compressor 1 is effectively avoided, and the efficiency of a carbon dioxide transcritical system is improved.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422665498.5U CN223327288U (en) | 2024-11-01 | 2024-11-01 | Passenger car air conditioning system using carbon dioxide refrigerant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422665498.5U CN223327288U (en) | 2024-11-01 | 2024-11-01 | Passenger car air conditioning system using carbon dioxide refrigerant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223327288U true CN223327288U (en) | 2025-09-12 |
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ID=96977684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202422665498.5U Active CN223327288U (en) | 2024-11-01 | 2024-11-01 | Passenger car air conditioning system using carbon dioxide refrigerant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223327288U (en) |
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2024
- 2024-11-01 CN CN202422665498.5U patent/CN223327288U/en active Active
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