CN107444071B - Using CO 2 Heat pump type electric automobile air conditioning system of refrigerant and working method thereof - Google Patents
Using CO 2 Heat pump type electric automobile air conditioning system of refrigerant and working method thereof Download PDFInfo
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- CN107444071B CN107444071B CN201710656135.7A CN201710656135A CN107444071B CN 107444071 B CN107444071 B CN 107444071B CN 201710656135 A CN201710656135 A CN 201710656135A CN 107444071 B CN107444071 B CN 107444071B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3202—Cooling devices using evaporation, i.e. not including a compressor, e.g. involving fuel or water evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H2001/3286—Constructional features
- B60H2001/3289—Additional cooling source
Abstract
The invention discloses a method for using CO 2 Heat pump type electric automobile air conditioner of refrigerantThe system and the working method thereof are that the air conditioning system comprises a carbon dioxide refrigeration compressor, a gas-liquid separator, an external cooler fan, a heat regenerator, a plate heat exchanger, a water pump, an expansion kettle, a warm air core, an evaporator, a blower, a two-position three-way valve, an electronic expansion valve a, an electronic expansion valve b, an electromagnetic valve a, an electromagnetic valve b, an electromagnetic valve c, an electromagnetic valve d, a damper, an internal air flow passage a, an internal air flow passage b and an internal air flow passage c. The invention solves the defects caused by the adoption of R134a refrigerant in the traditional heat pump type automobile air conditioner, and improves the heating capacity of an air conditioning system in winter.
Description
Technical Field
The invention relates to an automobile air conditioner, in particular to a method for using CO 2 A heat pump type electric automobile air conditioning system of refrigerant and a working method thereof.
Background
As one of the main directions of the current automobile development, the electric automobile has the advantages of diversified energy utilization, quietness, no pollution and the like. Compared with the traditional fuel automobile, the electric automobile has no heat utilization of an engine, and cannot adopt a traditional air conditioning system. The heat pump system is a good solution and has the advantage of high efficiency.
The prior air conditioning system of the electric automobile mainly has the following defects:
1. in part of the air conditioning systems of the electric automobiles, a pure PTC heating mode is adopted during heating, so that energy is not saved;
2. for the traditional heat pump type automobile air conditioner, R134a is adopted as the refrigerant, the heating capacity is low at low temperature, the low heating capacity at low temperature is ultimately determined by the physical property of the R134a refrigerant, the suction pressure of an R134a system is too low at lower ambient temperature, for example, at-15 ℃, R134a corresponds to saturation pressure of 1.64bar, in order to avoid system vacuum, the suction pressure of a compressor is controlled to be not lower than 1bar, meanwhile, the suction pressure is required to be limited for protecting the compressor, the rotating speed of the compressor is reduced, the flow rate of the refrigerant is reduced, and the performance is further reduced;
3. the R134a refrigerant can pollute the environment in the use and production processes.
Currently, both the European Union and North America have been under regulation for emissions from automotive air conditioning systems, and it is anticipated that the automotive industry will gradually curtail the production and use of HFC-like materials over several years as related international convention advances.
CO at present 2 As a refrigerant, there has been a well-established technology, and it is applied to an automobile air conditioner, but most of them are used as a refrigeration system, and in an electric automobile heat pump air conditioner, CO is used 2 The technology as a refrigerant is still immature, CO 2 The biggest disadvantage of being a refrigerant is CO 2 Has high critical pressure and low critical temperature (critical temperature 31.1 ℃ and critical pressure 7.37 MPa), and the main technical difficulties are as follows:
1. safety: CO 2 As the refrigerant, the high pressure is too high, especially when in refrigeration, the maximum high pressure reaches 11 MPa-15 MPa, and the maximum high pressure of R134a refrigerant adopted in the automobile air conditioner does not exceed 2MPa. If the high pressure side heat exchanger is placed in the vehicle, the life of personnel in the vehicle may be compromised if a leak should occur.
2. The pressure resistance requirement on the heat exchanger is high: at present, an automobile air conditioner basically adopts a parallel flow heat exchanger as a condenser, and the heat exchanger has the advantages of strong heat exchange capacity and small volume, but has low pressure resistance degree, and is difficult to deal with CO 2 Pressure requirements of the heat pump system.
Disclosure of Invention
The invention aims to: the invention aims to provide a method for using CO 2 The heat pump type electric air conditioning system of the refrigerant and the working method thereof aim to overcome the defects caused by the adoption of R134a refrigerant in the traditional heat pump type automobile air conditioner and improve the heating capacity of the air conditioning system in winter.
In order to achieve the above purpose, the present invention adopts the following technical scheme: CO is used 2 A heat pump type electric automobile air conditioning system of refrigerant comprises a carbon dioxide refrigeration compressor, a gas-liquid separator, an external cooler and an external cooler fanThe device comprises a heat regenerator, a plate heat exchanger, a water pump, an expansion kettle, a warm air core, an evaporator, a blower, a two-position three-way valve, an electronic expansion valve a, an electronic expansion valve b, a solenoid valve a, a solenoid valve b, a solenoid valve c, a solenoid valve d, a throttle, an air flow passage a in a vehicle, an air flow passage b in the vehicle and an air flow passage c in the vehicle;
the air suction side of the carbon dioxide refrigeration compressor is connected with one end of a low-pressure flow passage of a heat regenerator, the other end of the low-pressure flow passage of the heat regenerator is connected with an outlet of a gas-liquid separator, an air outlet of the carbon dioxide refrigeration compressor is connected with one end of a solenoid valve d and one end of a plate heat exchanger refrigerant flow passage respectively, the other end of the plate heat exchanger refrigerant flow passage is connected with one end of a solenoid valve c, the other end of the solenoid valve d is connected with a first port of a two-position three-way valve, a second port of the two-position three-way valve is connected with an inlet of the gas-liquid separator, a third port of the two-position three-way valve is connected with one end of an external cooler of the vehicle, the other end of the external cooler is connected with one end of the solenoid valve a and one end of the electronic expansion valve a respectively, the other end of the solenoid valve a and the other end of the electronic expansion valve a are connected with the other end of the solenoid valve c and one end of the solenoid valve b respectively, the other end of the solenoid valve b and the other end of the electronic expansion valve b are connected with one end of the electronic expansion valve b and the other end of the evaporator respectively, and the other end of the evaporator is connected with the inlet of the gas-liquid separator;
the outlet of the water pump is connected with one end of the expansion kettle, the other end of the expansion kettle is connected with one end of the warm air core, the other end of the warm air core is connected with one end of the cooling water flow passage of the plate heat exchanger, and one end of the cooling water flow passage of the plate heat exchanger is connected with the inlet of the water pump;
the inlet of the external cooler fan is connected with the external air, and the external air is driven to flow through the surface of the external cooler through the external cooler fan;
one end of an air flow passage a in the vehicle, one end of an air flow passage b in the vehicle and one end of an air flow passage c in the vehicle are respectively connected with air in the vehicle, the other end of the air flow passage a in the vehicle is respectively connected with the other end of the air flow passage b in the vehicle and the other end of the air flow passage c in the vehicle through an air door, a blower and an evaporator are fixed in the air flow passage a in the vehicle, the air in the vehicle is driven to flow through the surface of the evaporator by the blower, and a warm air core is fixed in the air flow passage b in the vehicle.
The working method of the heat pump type electric automobile air conditioning system comprises the following steps:
when the interior of the vehicle needs to be refrigerated in summer, the opening of the air door is controlled to disconnect the interior air flow passage a from the interior air flow passage b, meanwhile, the interior air flow passage a is communicated with the interior air flow passage c, the exterior cooler fan, the blower, the electromagnetic valve a, the electromagnetic valve b and the electromagnetic valve d are opened, the water pump and the electromagnetic valve c are closed, the refrigerant flowing out of the carbon dioxide refrigeration compressor sequentially passes through the electromagnetic valve d, the two-position three-way valve, the exterior cooler, the electromagnetic valve a and the high-pressure flow passage of the regenerator, the electromagnetic valve b, the electronic expansion valve b, the evaporator, the gas-liquid separator and the low-pressure flow passage of the regenerator, and finally enters the carbon dioxide refrigeration compressor, the refrigerant condenses when flowing through the exterior cooler, heat is transferred to the exterior air in the condensation process, the refrigerant evaporates when flowing through the evaporator, the heat in the interior air is absorbed in the evaporation process, and the interior refrigeration is realized;
when heating is needed in a vehicle in winter, the opening of the air door is controlled to enable the air flow passage a in the vehicle to be communicated with the air flow passage b in the vehicle, meanwhile, the air flow passage a in the vehicle is disconnected with the air flow passage c in the vehicle, the fan, the water pump, the blower and the electromagnetic valve c of the external cooler are started, the electromagnetic valve a, the electromagnetic valve b and the electromagnetic valve d are closed, the refrigerant flowing out of the carbon dioxide refrigeration compressor sequentially passes through the refrigerant flow passage of the plate heat exchanger, the electromagnetic valve c, the high-pressure flow passage of the regenerator, the electronic expansion valve a, the external cooler, the two-position three-way valve, the gas-liquid separator and the low-pressure flow passage of the regenerator, finally, the refrigerant enters the carbon dioxide refrigeration compressor, cooling water in the expansion kettle circularly flows through the cooling water flow passage of the plate heat exchanger and the warm air core under the action of the water pump, the refrigerant is condensed when flowing through the plate heat exchanger, the refrigerant is evaporated when flowing through the external cooler, the cooling water absorbs heat in the external air in the vehicle in the evaporation process, and the cooling water is transferred to the air in the vehicle when flowing through the warm air core, so that heating is realized in the vehicle;
when defrosting is needed to be carried out on the external cooler in winter, the opening of the air door is controlled to enable the internal air flow passage a to be communicated with the internal air flow passage b, meanwhile, the internal air flow passage a is disconnected with the internal air flow passage c, the external cooler fan, the water pump, the blower, the electromagnetic valve a, the electromagnetic valve b, the electromagnetic valve c and the electromagnetic valve d are started, cooling water in the expansion kettle circulates through the cooling water flow passage of the plate heat exchanger and the warm air core body under the action of the water pump, refrigerant flowing out of the carbon dioxide refrigeration compressor is firstly divided into two paths, one path of refrigerant sequentially passes through the electromagnetic valve d, the two-position three-way valve, the external cooler, the electromagnetic valve a and the high-pressure flow passage of the regenerator, the other path of refrigerant sequentially passes through the refrigerant flow passage of the plate heat exchanger and the electromagnetic valve c, then the two paths of refrigerant are converged and pass through the electromagnetic valve b, the electronic expansion valve b, the evaporator, the air-liquid separator and the low-pressure flow passage of the carbon dioxide refrigeration compressor, the refrigerant is condensed when flowing through the external cooler, the surface of the external cooler is melted in the condensation process, the other path of refrigerant is condensed when flowing through the plate heat exchanger, the heat is transferred to the air core when the heat is evaporated in the cooling process, and the heat is transferred to the air in the cooling process when the air is cooled in the vehicle, and the heat is reduced when the heat is absorbed in the air in the cooling process, and the air is cooled in the air;
when defogging is needed in the vehicle in winter, the opening of the air door is controlled to enable the air flow passage a in the vehicle to be communicated with the air flow passage b in the vehicle, meanwhile, the air flow passage a in the vehicle is disconnected with the air flow passage c in the vehicle, the fan, the water pump, the blower, the electromagnetic valve b and the electromagnetic valve c of the external cooler are opened, the electromagnetic valve a and the electromagnetic valve d are closed, cooling water in the expansion kettle circularly flows through the cooling water flow passage of the plate heat exchanger and the warm air core body under the action of the water pump, refrigerant flowing out of the carbon dioxide refrigerating compressor sequentially passes through the refrigerant flow passage of the plate heat exchanger and the electromagnetic valve c and is divided into two paths, one path of refrigerant sequentially passes through the high-pressure flow passage of the heat regenerator, the electronic expansion valve a, the external cooler, the two-position three-way valve, the air-liquid separator and the low-pressure flow passage of the heat regenerator, finally enters the carbon dioxide refrigerating compressor, the other path of refrigerant sequentially passes through the electromagnetic valve b, the electronic expansion valve b, the evaporator and the air-liquid separator, the one path of refrigerant is evaporated when flowing through the external cooler, the other path of refrigerant is evaporated in the external cooler, the heat in the evaporation process, the other path of refrigerant is evaporated in the evaporation process, the refrigerant is sequentially, the refrigerant in the evaporation process is carried out in the evaporation process, the heat is carried out in the process, the heat is absorbed in the plate heat process, the air is cooled in the vehicle, the heat is cooled in the vehicle, the vehicle is cooled, and the heat is cooled in the vehicle, and the air is cooled, and then the heat is cooled, and the heat is further, and the heat is cooled in the air and the air is cooled and the air and is cooled and the air.
The heat pump type electric automobile air conditioning system has the following advantages:
1. PTC is not needed for heating of the heat pump system, and the energy is saved and the efficiency is high;
2. the heat pump system is for CO 2 The design of the refrigerant has no pollution to the environment and cannot be eliminated due to the regulations related to the environment;
3. the defect of insufficient heating capacity of the traditional R134a refrigerant is overcome, and the heating capacity at low temperature is greatly improved. Even under the environment of-20 ℃, the heating requirement can be met;
4. the high-pressure side of the heat pump system adopts a plate heat exchanger, so that the pressure resistance is better, and meanwhile, the heat exchange effect is better due to the adoption of heat exchange between water and a refrigerant;
5. the heat exchanger of the high-pressure part of the heat pump system is arranged outside the vehicle, and the safety is good.
Drawings
FIG. 1 is a schematic diagram of the heat pump type electric vehicle air conditioning system of the present invention in a cooling mode;
FIG. 2 is a schematic diagram of the heat pump type electric vehicle air conditioning system of the present invention in a heat pump mode;
FIG. 3 is a schematic diagram of the heat pump type electric vehicle air conditioning system of the present invention in a defrost mode;
FIG. 4 is a schematic diagram of the heat pump type electric vehicle air conditioning system in a defogging mode;
in the figure: 1-carbon dioxide refrigeration compressor, 2-gas-liquid separator, 3-vehicle exterior cooler, 4-vehicle exterior cooler fan, 5-regenerator, 6-plate heat exchanger, 7-water pump, 8-expansion kettle, 9-warm air core, 10-evaporator, 11-blower, 12-two-position three-way valve, 13-electronic expansion valve a, 14-electronic expansion valve b, 15-solenoid valve a, 16-solenoid valve b, 17-solenoid valve c, 18-solenoid valve d, 19-air door, 20-vehicle interior air flow passage a, 21-vehicle interior air flow passage b, 22-vehicle interior air flow passage c.
The specific embodiment is as follows:
the invention is further explained below with reference to the drawings.
As shown in FIG. 1, one of the present invention uses CO 2 The heat pump type electric automobile air conditioning system of the refrigerant comprises a carbon dioxide refrigeration compressor 1, a gas-liquid separator 2, an external cooler 3, an external cooler fan 4, a heat regenerator 5, a plate heat exchanger 6, a water pump 7, an expansion kettle 8, a warm air core 9, an evaporator 10, a blower 11, a two-position three-way valve 12, an electronic expansion valve a13, an electronic expansion valve b14, a solenoid valve a15, a solenoid valve b16, a solenoid valve c17, a solenoid valve d18, a throttle 19, an internal air flow passage a20, an internal air flow passage b21 and an internal air flow passage c22.
The air suction side of the carbon dioxide refrigeration compressor 1 is connected with one end of a low-pressure flow passage of the heat regenerator 5, the other end of the low-pressure flow passage of the heat regenerator 5 is connected with an outlet of the gas-liquid separator 2, an air outlet of the carbon dioxide refrigeration compressor 1 is respectively connected with one end of a solenoid valve d18 and one end of a refrigerant flow passage of the plate heat exchanger 6, the other end of the refrigerant flow passage of the plate heat exchanger 6 is connected with one end of a solenoid valve c17, the other end of the solenoid valve d18 is connected with a first port of the two-position three-way valve 12, a second port of the two-position three-way valve 12 is connected with an inlet of the gas-liquid separator 2, the third port of the two-position three-way valve 12 is connected with one end of the external cooler 3, the other end of the external cooler 3 is respectively connected with one end of the electromagnetic valve a15 and one end of the electronic expansion valve a14, the other end of the electromagnetic valve a15 and the other end of the electronic expansion valve a14 are respectively connected with one end of a high-pressure runner of the heat regenerator 5, the other end of the high-pressure runner of the heat regenerator 5 is respectively connected with the other end of the electromagnetic valve c17 and one end of the electromagnetic valve b16, the other end of the electromagnetic valve b16 is connected with one end of the electronic expansion valve b13, the other end of the electronic expansion valve b13 is connected with one end of the evaporator 10, and the other end of the evaporator 10 is connected with an inlet of the gas-liquid separator 2.
The outlet of the water pump 7 is connected with one end of the expansion kettle 8, the other end of the expansion kettle 8 is connected with one end of the warm air core 9, the other end of the warm air core 9 is connected with one end of the cooling water flow passage of the plate heat exchanger 6, and one end of the cooling water flow passage of the plate heat exchanger 6 is connected with the inlet of the water pump 7.
The inlet of the external cooler fan 4 is connected with the external air, and the external air is driven to flow through the surface of the external cooler 3 by the external cooler fan 4.
One end of the air flow passage a20, one end of the air flow passage b21 and one end of the air flow passage c22 are respectively connected with the air in the vehicle, the other end of the air flow passage a20 is respectively connected with the other end of the air flow passage b21 and the other end of the air flow passage c22 through the air door 19, the blower 11 and the evaporator 10 are fixed in the air flow passage a20, the air in the vehicle is driven to flow through the surface of the evaporator 10 by the blower 11, and the warm air core 9 is fixed in the air flow passage b 21.
The heat pump type electric automobile air conditioning system of the agent can realize multiple functions, and in total, four working modes are respectively a refrigerating mode, a heat pump mode, a defrosting mode and a defogging mode, wherein the refrigerating mode is suitable for refrigerating requirements in a summer crown block, the heat pump mode is suitable for heating requirements in a winter crown block, the defrosting mode is suitable for defrosting working conditions of an outer cooler 3 of the winter crown block, and the defogging mode is suitable for defogging working conditions in a winter crown block.
The working method of the heat pump type electric automobile air conditioning system comprises the following steps:
when the interior of the vehicle needs to be refrigerated in summer, the opening of the air door 19 is controlled to disconnect the interior air flow passage a20 from the interior air flow passage b21, meanwhile, the interior air flow passage a20 is communicated with the interior air flow passage c22, the exterior cooler fan 4, the blower 11, the electromagnetic valve a15, the electromagnetic valve b16 and the electromagnetic valve d18 are opened, the water pump 7 and the electromagnetic valve c17 are closed, the refrigerant flowing out of the carbon dioxide refrigeration compressor 1 sequentially passes through the electromagnetic valve d18, the two-position three-way valve 12, the exterior cooler 3, the electromagnetic valve a15, the high-pressure flow passage of the regenerator 5, the electromagnetic valve b16, the electronic expansion valve b13, the evaporator 10, the gas-liquid separator 2 and the low-pressure flow passage of the regenerator 5, and finally enters the carbon dioxide refrigeration compressor 1, the refrigerant condenses when flowing through the exterior cooler 3, heat is transferred to the exterior air in the condensation process, the refrigerant evaporates when flowing through the evaporator 10, and the heat in the interior air is absorbed in the process of the vehicle in the evaporation process, so that the interior of the vehicle is refrigerated is realized;
when heating is needed in a vehicle in winter, the opening of the air door 19 is controlled to enable the air flow passage a20 in the vehicle to be communicated with the air flow passage b21 in the vehicle, meanwhile, the air flow passage a20 in the vehicle is disconnected with the air flow passage c22 in the vehicle, the fan 4 of the external cooler, the water pump 7, the blower 11 and the electromagnetic valve c17 are opened, the electromagnetic valve a15, the electromagnetic valve b16 and the electromagnetic valve d18 are closed, the refrigerant flowing out of the carbon dioxide refrigeration compressor 1 sequentially passes through the refrigerant flow passage of the plate heat exchanger 6, the electromagnetic valve c17 and the high-pressure flow passage of the regenerator 5, the electronic expansion valve a14, the external cooler 3, the two-position three-way valve 12, the gas-liquid separator 2 and the low-pressure flow passage of the regenerator 5, finally enters the carbon dioxide refrigeration compressor 1, cooling water in the expansion kettle 8 circulates through the cooling water flow passage of the plate heat exchanger 6 and the warm air core 9 under the action of the water pump 7, the refrigerant is condensed when flowing through the plate heat exchanger 6, heat is transferred to the cooling water in the condensation process, the refrigerant is evaporated when flowing through the external cooler 3, the heat in the evaporation process is absorbed in the cooling core, and the heat in the vehicle is transferred to the warm air when the cooling core is heated in the vehicle;
when defrosting is needed to be carried out on the external cooler 3 in winter, or defogging is needed to be carried out in the vehicle, the opening of the air door 19 is controlled to enable the internal air flow passage a20 to be communicated with the internal air flow passage b21, meanwhile, the internal air flow passage a20 is disconnected with the internal air flow passage c22, the external cooler fan 4, the water pump 7, the blower 11, the electromagnetic valve a15, the electromagnetic valve b16, the electromagnetic valve c17 and the electromagnetic valve d18 are started, cooling water in the expansion kettle 8 circulates through the cooling water flow passage of the plate heat exchanger 6 and the warm air core 9 under the action of the water pump 7, refrigerant flowing out of the carbon dioxide refrigeration compressor 1 is firstly divided into two paths, one path sequentially passes through the electromagnetic valve d18, the two-position three-way valve 12, the external cooler 3, the electromagnetic valve a15 and the high-pressure flow passage of the heat regenerator 5, the other path sequentially passes through the refrigerant flow passage of the plate heat exchanger 6 and the electromagnetic valve c17, then the two paths of refrigerant are combined and pass through the electromagnetic valve b16, the electronic expansion valve b13, the evaporator 10, the gas-liquid separator 2 and the low-pressure flow passage of the carbon dioxide compressor 5, finally the cooling water enters the carbon dioxide compressor 1, when the refrigerant flows through the plate heat exchanger 3 and passes through the external heat exchanger 3, the heat exchange layer of the heat exchanger is carried out in the vehicle, and the heat is absorbed by the air in the cooling water is reduced in the process, and the heat is absorbed by the air in the cooling water, and the heat is cooled in the cooling water, and the air is cooled in the cooling medium, and the air is cooled in the air and the cooling medium and the air and the cooling medium is cooled when the cooling medium is cooled and cooled;
when defogging is needed in the vehicle in winter, the opening of the air door 19 is controlled to enable the air flow passage a20 in the vehicle to be communicated with the air flow passage b21 in the vehicle, meanwhile, the air flow passage a20 in the vehicle is disconnected with the air flow passage c22 in the vehicle, the fan 4 of the external cooler, the water pump 7, the blower 11, the electromagnetic valve b16 and the electromagnetic valve c17 are started, the electromagnetic valve a15 and the electromagnetic valve d18 are closed, cooling water in the expansion kettle 8 circularly flows through the cooling water flow passage of the plate heat exchanger 6 and the warm air core 9 under the action of the water pump 7, refrigerant flowing out of the carbon dioxide refrigeration compressor 1 sequentially passes through the refrigerant flow passage of the plate heat exchanger 6 and the electromagnetic valve c17 and is divided into two paths, one path of refrigerant sequentially passes through the high-pressure flow passage of the heat regenerator 5, the electronic expansion valve a14, the external cooler 3, the two-position three-way valve 12, the gas-liquid separator 2 and the low-pressure flow passage of the heat regenerator 5, finally enters the carbon dioxide refrigeration compressor 1, the other path of refrigerant sequentially passes through the electromagnetic valve b16, the electronic expansion valve b13, the evaporator 10 and the gas-liquid separator 2, finally enters the carbon dioxide compressor 1, the one path of refrigerant flows through the evaporator 3, the heat is evaporated in the plate heat exchanger core 9, the heat is absorbed in the vehicle air is further in the vehicle, the heat is absorbed in the vehicle, the air is cooled in the vehicle, and the heat is cooled in the air is cooled in the vehicle, and the air is cooled in the air, and the air is cooled in the vehicle, and the air is cooled in the air is cooled, and the air is cooled in the air and the vehicle.
In general, the heat pump type electric automobile air conditioning system of the invention adopts CO 2 As the refrigerant, the flow direction of the refrigerant can be changed through the cooperation of the electromagnetic valve, so that the air conditioning system works in different modes to realize different functions of refrigeration, heating, defogging, defrosting of the evaporator and the like.
The plate heat exchanger, the external cooler, the heat regenerator, the carbon dioxide refrigeration compressor and the matched high-pressure exhaust pipe of the heat pump type electric automobile air conditioning system are all high-pressure components, the high-pressure components are arranged outside an automobile, the warm air core, the evaporator and the like are all low-pressure components, and the low-pressure components are arranged in the automobile in order to ensure the safety of the air conditioning system in the use process.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (2)
1. CO is used 2 The heat pump type electric automobile air conditioning system of refrigerant, its characterized in that: the device comprises a carbon dioxide refrigeration compressor (1), a gas-liquid separator (2), an off-vehicle cooler (3), an off-vehicle cooler fan (4), a heat regenerator (5), a plate heat exchanger (6), a water pump (7), an expansion kettle (8), a warm air core (9), an evaporator (10), a blower (11), a two-position three-way valve (12), an electronic expansion valve a (14), an electronic expansion valve b (13), an electromagnetic valve a (15), an electromagnetic valve b (16), an electromagnetic valve c (17), an electromagnetic valve d (18), a throttle (19), an in-vehicle air flow passage a (20), an in-vehicle air flow passage b (21) and an in-vehicle air flow passage c (22);
the air suction side of the carbon dioxide refrigeration compressor (1) is connected with one end of a low-pressure flow passage of the heat regenerator (5), the other end of the low-pressure flow passage of the heat regenerator (5) is connected with an outlet of the gas-liquid separator (2), an air outlet of the carbon dioxide refrigeration compressor (1) is respectively connected with one end of the electromagnetic valve d (18) and one end of a refrigerant flow passage of the plate heat exchanger (6), the other end of the refrigerant flow passage of the plate heat exchanger (6) is respectively connected with one end of the electromagnetic valve c (17), the other end of the electromagnetic valve d (18) is connected with a first port of the two-position three-way valve (12), a second port of the two-position three-way valve (12) is connected with one end of the gas-liquid separator (2), a third port of the two-position three-way valve (12) is connected with one end of the external cooler (3), the other end of the external cooler (3) is respectively connected with one end of the electromagnetic valve a (15) and one end of the electronic expansion valve a (14), the other end of the electromagnetic valve a (15) and the other end of the electronic expansion valve a (14) are respectively connected with one end of the high-pressure flow passage of the heat regenerator (5), the other end of the electromagnetic valve a (5) is connected with one end of the electromagnetic valve b (16) and one end of the electromagnetic valve b (13) is respectively connected with the other end of the electromagnetic valve b (13) of the electromagnetic valve (13), the other end of the evaporator (10) is connected with the inlet of the gas-liquid separator (2);
the outlet of the water pump (7) is connected with one end of the expansion kettle (8), the other end of the expansion kettle (8) is connected with one end of the warm air core body (9), the other end of the warm air core body (9) is connected with one end of a cooling water flow channel of the plate heat exchanger (6), and one end of the cooling water flow channel of the plate heat exchanger (6) is connected with the inlet of the water pump (7);
the inlet of the external cooler fan (4) is connected with the external air, and the external air is driven to flow through the surface of the external cooler (3) through the external cooler fan (4);
one end of an air flow passage a (20) in a vehicle, one end of an air flow passage b (21) in the vehicle and one end of an air flow passage c (22) in the vehicle are respectively connected with the air in the vehicle, the other end of the air flow passage a (20) in the vehicle is respectively connected with the other end of the air flow passage b (21) in the vehicle and the other end of the air flow passage c (22) in the vehicle through an air door (19), a blower (11) and an evaporator (10) are fixed in the air flow passage a (20) in the vehicle, the air in the vehicle is driven by the blower (11) to flow through the surface of the evaporator (10), and a warm air core (9) is fixed in the air flow passage b (21) in the vehicle.
2. A method of operating the heat pump type electric vehicle air conditioning system of claim 1, the method comprising:
when the interior of the vehicle needs to be refrigerated in summer, opening of an air door (19) is controlled to disconnect an interior air flow passage a (20) from an interior air flow passage b (21), meanwhile, the interior air flow passage a (20) is communicated with an interior air flow passage c (22), an exterior cooler fan (4), a blower (11), an electromagnetic valve a (15), an electromagnetic valve b (16) and an electromagnetic valve d (18) are opened, a water pump (7) and an electromagnetic valve c (17) are closed, refrigerant flowing out of a carbon dioxide refrigeration compressor (1) sequentially passes through the electromagnetic valve d (18), a two-position three-way valve (12), an exterior cooler (3), the electromagnetic valve a (15), a high-pressure flow passage of a regenerator (5), the electromagnetic valve b (16), an electronic expansion valve b (13), an evaporator (10), a gas-liquid separator (2) and the regenerator (5) and finally enters the carbon dioxide refrigeration compressor (1), the refrigerant is condensed when flowing through the exterior cooler (3), heat is transferred to the exterior air in the condensation process, the refrigerant is evaporated when flowing through the evaporator (10), and the heat in the vehicle is absorbed in the vehicle in the process, and the interior of the vehicle is further realized;
when heating is needed in the vehicle in winter, the opening of the air door (19) is controlled to enable the air flow passage a (20) in the vehicle to be communicated with the air flow passage b (21) in the vehicle, meanwhile, the air flow passage a (20) in the vehicle is disconnected with the air flow passage c (22) in the vehicle, the fan (4) of the external cooler of the vehicle, the water pump (7), the blower (11) and the electromagnetic valve c (17) are opened, the electromagnetic valve a (15), the electromagnetic valve b (16) and the electromagnetic valve d (18) are closed, the refrigerant flowing out of the carbon dioxide refrigerating compressor (1) sequentially passes through the refrigerant flow passage of the plate heat exchanger (6), the electromagnetic valve c (17), the high-pressure flow passage of the regenerator (5), the electronic expansion valve a (14), the external cooler (3), the two-position three-way valve (12), the gas-liquid separator (2) and the low-pressure flow passage of the regenerator (5) are opened, finally, cooling water in the expansion kettle (8) circularly flows through the plate heat exchanger (6) under the action of the water pump (7) to cool the water flow passage and the warm air core (9), the refrigerant is evaporated in the process when flowing through the plate heat exchanger (6), heat is transferred to the air in the cooling process when the cooling water is evaporated in the vehicle, and the heat is transferred to the air in the cooling process when the air is cooled in the vehicle, thereby realizing heating in the vehicle;
when defrosting is needed to be carried out on the external cooler (3) in winter, the opening of the air door (19) is controlled to enable the internal air flow passage a (20) to be communicated with the internal air flow passage b (21), meanwhile, the internal air flow passage a (20) is disconnected with the internal air flow passage c (22), the external cooler fan (4), the water pump (7), the air blower (11), the electromagnetic valve a (15), the electromagnetic valve b (16), the electromagnetic valve c (17) and the electromagnetic valve d (18) are started, cooling water in the expansion kettle (8) circulates through the cooling water flow passage of the plate heat exchanger (6) and the warm air core (9) under the action of the water pump (7), refrigerant flowing out of the carbon dioxide refrigeration compressor (1) is firstly divided into two paths, one path of refrigerant sequentially passes through the electromagnetic valve d (18), the two-position three-way valve (12), the external cooler (3), the electromagnetic valve a (15) and the high-pressure flow passage of the heat regenerator (5), the other path of refrigerant sequentially passes through the refrigerant flow passage of the plate heat exchanger (6) and the electromagnetic valve c (17), then the two paths of refrigerant are converged and then pass through the electronic expansion valve b (16), the evaporator (10) and the air compressor (1) and finally the refrigerant enters the low-pressure condenser (1) when the refrigerant flows through the cold air compressor (1), the method comprises the steps that frost is formed on the surface of an external cooler (3) of a vehicle in a condensation process, another path of refrigerant is condensed when flowing through a plate heat exchanger (6), heat is transferred to cooling water in the condensation process, the refrigerant is evaporated when flowing through an evaporator (10), heat in air in the vehicle is absorbed in the evaporation process, and the cooling water transfers the heat to the air in the vehicle when flowing through a warm air core (9) so as to prevent the temperature of the air in the vehicle from being reduced;
when defogging is needed in a vehicle in winter, the opening of the air door (19) is controlled to enable the air flow passage a (20) in the vehicle to be communicated with the air flow passage b (21) in the vehicle, meanwhile, the air flow passage a (20) in the vehicle is disconnected with the air flow passage c (22) in the vehicle, the fan (4) of the external cooler, the water pump (7), the blower (11), the electromagnetic valve b (16) and the electromagnetic valve c (17) of the external cooler are opened, the electromagnetic valve a (15) and the electromagnetic valve d (18) are closed, cooling water in the expansion kettle (8) circulates through the cooling water flow passage and the warm air core (9) of the plate heat exchanger (6) under the action of the water pump (7), refrigerant flowing out of the carbon dioxide refrigeration compressor (1) sequentially passes through the refrigerant flow passage of the plate heat exchanger (6) and the electromagnetic valve c (17) and then is divided into two paths, one path of refrigerant sequentially passes through the high-pressure flow passage of the heat regenerator (5), the electronic expansion valve a (14), the external cooler (3) of the two-position three-way valve (12), the gas-liquid separator (2) and the low-pressure flow passage of the electromagnetic valve (5) finally enters the carbon dioxide compressor (1) and the other electromagnetic valve (13) and the other refrigerant passes through the electromagnetic valve b (13) of the evaporator (1) sequentially, one path of refrigerant evaporates when flowing through the cooler (3) outside the vehicle, the evaporation process absorbs heat in the air outside the vehicle, the other path of refrigerant evaporates when flowing through the evaporator (10), the evaporation process absorbs heat in the air inside the vehicle and dehumidifies the air inside the vehicle, the refrigerant condenses when flowing through the plate heat exchanger (6), the heat is transferred to cooling water in the condensation process, the cooling water transfers the heat to the air inside the vehicle again when flowing through the warm air core (9), and then the air inside the vehicle is heated, the heated dry hot air is introduced into the vehicle, and water mist on the window is removed.
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Address after: No. 389 Kening Road, Science Park, Jiangning District, Nanjing City, Jiangsu Province, 210000 Applicant after: Xiezhong International Thermal Management System (Jiangsu) Co.,Ltd. Applicant after: Liaoning Chenyou Automobile Air-Conditioning System Co.,Ltd. Address before: No.389, Kening Road, Science Park, Jiangning District, Nanjing City, Jiangsu Province, 211100 Applicant before: NANJING XIEZHONG AUTO-AIRCONDITIONER (COMPANY) Co.,Ltd. Applicant before: Liaoning Chenyou Automobile Air-Conditioning System Co.,Ltd. |
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