CN107020915B - Air conditioner heat pump system with coolant liquid return circuit for new energy automobile - Google Patents
Air conditioner heat pump system with coolant liquid return circuit for new energy automobile Download PDFInfo
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- CN107020915B CN107020915B CN201710227945.0A CN201710227945A CN107020915B CN 107020915 B CN107020915 B CN 107020915B CN 201710227945 A CN201710227945 A CN 201710227945A CN 107020915 B CN107020915 B CN 107020915B
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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
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
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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
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
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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
- B60H1/3204—Cooling devices using compression
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- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses an air-conditioning heat pump system with a cooling liquid loop for a new energy automobile, which comprises a heat pump system and a cooling liquid loop system, wherein the heat pump system comprises a heat pump, a cooling liquid loop and a cooling liquid loop; the heat pump system comprises an electric compressor, an external heat exchanger, a plate heat exchanger, an internal evaporator, an internal heat exchanger, a gas-liquid separator, a first electronic expansion valve, a second electronic expansion valve, a normally open electromagnetic valve, a normally closed electromagnetic valve, a one-way stop valve and a connecting pipeline thereof; the electric compressor is respectively connected with the external heat exchanger and the plate heat exchanger through a normally open electromagnetic valve and a normally closed electromagnetic valve, the external heat exchanger is connected with the internal evaporator through a second electric control expansion valve, the internal heat exchanger is connected with the plate heat exchanger, and the gas-liquid separator is arranged in front of the electric compressor; the cooling liquid loop system comprises a cooling liquid pump, a cooling liquid expansion water tank, a PTC electric heater and a connecting pipeline thereof; the heat pump system realizes the refrigeration, heating and dehumidification operation modes of the heat pump system by adjusting the opening and closing of the normally open electromagnetic valve and the normally closed electromagnetic valve.
Description
Technical Field
The invention relates to the field of automobile air conditioners, in particular to an air conditioning heat pump system with a cooling loop for a new energy automobile.
Background
The energy crisis and the environmental pollution become global problems in the growing trend, the adoption of new energy to replace traditional fossil fuels is an inevitable trend of national development, the air conditioning system is an important factor for improving the comfort level of new energy automobiles, the temperature inside the automobiles can be reasonably adjusted according to different conditions, and the air conditioning system is mainly adopted to perform the functions of refrigeration, heat supply and dehumidification. The new energy automobile air conditioning system mainly utilizes electric power and hybrid power as energy consumption, but because the electric capacity of the new energy automobile is fixed, the waste heat of an engine cannot be utilized for effective heating, the energy consumption of the air conditioning system can influence the cruising ability of new energy, and the technical requirements of the air conditioning system of the new energy automobile are forced to approach energy conservation and high-efficiency energy utilization.
At present, a common heating mode of the new energy automobile is to use a PTC electric heater for heating, the PTC electric heater has low efficiency, and the PTC electric heater consumes electric energy of a battery of the new energy automobile, so that the driving mileage of the new energy automobile is greatly reduced. And the theoretical efficiency COP of the heat pump system is more than 1, which makes the heat pump system a feasible alternative to PTC electric heating.
In the air-conditioning heat pump system, different modes are switched by a four-way reversing valve. In the summer cooling mode, the high-temperature and high-pressure gas refrigerant compressed by the compressor is cooled and condensed by an exterior heat exchanger (exterior condenser), and then enters the evaporator after being throttled by an expansion valve. The air introduced into the HVAC module is cooled by heat exchange with the outside air and evaporated in the evaporator to a low-temperature and low-pressure refrigerant gas. In the winter heating mode, high-temperature and high-pressure gas refrigerant compressed by the compressor enters an indoor condenser to exchange heat with air introduced into the HVAC module, heats air in the vehicle, is throttled by an expansion valve, enters a heat exchanger (evaporator) outside the vehicle to absorb heat and then returns to the compressor. In the winter dehumidification mode, air introduced into the HVAC module firstly passes through an internal evaporator, moisture in the air is condensed, and the dehumidified air is heated and heated by an internal condenser.
Because the service environment of the vehicle is more complicated, and the technology of the four-way reversing valve for the vehicle is still not mature, the normal heating of the heat pump system can not be ensured in a low-temperature environment or when the system fails. Meanwhile, in the dehumidification process, the introduced air passes through the evaporator in the vehicle, the air temperature is greatly reduced, and then the air is heated by the condenser in the vehicle, so that the outlet air temperature is reduced, the heating effect is influenced, and the requirement of a more excellent solution for the air-conditioning heat pump system for the new energy vehicle is further forced.
Disclosure of Invention
In order to solve the technical problems, the invention provides an air-conditioning heat pump system with a cooling liquid loop for a new energy automobile.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides an air conditioner heat pump system for new energy automobile with coolant liquid return circuit, includes: a heat pump system and a coolant loop system;
the heat pump system comprises an electric compressor for generating a high-temperature and high-pressure refrigerant, an external heat exchanger, a plate heat exchanger, an internal evaporator, an internal heat exchanger, a gas-liquid separator, a first electronic expansion valve, a second electronic expansion valve, a normally open electromagnetic valve, a normally closed electromagnetic valve, a one-way stop valve and a connecting pipeline thereof; the electric compressor is respectively connected with the heat exchanger outside the vehicle and the plate heat exchanger through a normally open electromagnetic valve and a normally closed electromagnetic valve, the heat exchanger outside the vehicle is connected with the evaporator inside the vehicle through a second electric control expansion valve, the heat exchanger inside the vehicle is connected with the plate heat exchanger, and the gas-liquid separator is arranged in front of the electric compressor;
the cooling liquid loop system comprises a cooling liquid pump, a cooling liquid expansion water tank, a PTC electric heater and a connecting pipeline thereof; the plate heat exchanger is connected with a cooling liquid pump, and the cooling liquid pump is a direct-current brushless motor pump and can adjust the flow of the cooling liquid so as to adjust the temperature of outlet air;
the heat pump system switches the connection relation of the heat pump system pipelines by adjusting the opening and closing of the normally open electromagnetic valve and the normally closed electromagnetic valve to realize the refrigeration, heating and dehumidification operation modes of the heat pump system. In summer, the system operates in a refrigeration mode to reduce the temperature of air in the vehicle; in winter, the system operates in a heating mode to improve the temperature of air in the vehicle; in winter, when the relative humidity in the vehicle is higher and the vehicle windshield is fogged, the system operates in a dehumidification mode
The electric compressor generates high-temperature and high-pressure refrigerant gas during working, and the gas-liquid separator arranged in front of the electric compressor contains dry materials, so that liquid impact of the compressor is effectively prevented, and the running reliability of the compressor is improved;
the plate heat exchanger is arranged in a cabin of an engine of a vehicle, a good backflow effect is achieved, a water cooling pipeline connected with the plate heat exchanger is connected with a heater of an original HVAC (heating ventilating and air conditioning) module of the vehicle, and the heat pump air conditioning system for the new energy automobile and a traditional internal combustion engine system are compatible to use. The plate heat exchanger is used for carrying out heat exchange between refrigerant and cooling liquid with the cooling liquid loop system; the flow adjustment and the internal circulation of the cooling liquid are realized through a cooling liquid pump;
the interior evaporator is used for evaporating and absorbing heat of the refrigerant, so that air in the vehicle is cooled;
the heat exchanger in the vehicle is used for heat exchange between the cooling liquid and air in the vehicle; the PTC electric heater is used for auxiliary heating at low temperature.
Preferably, the heat pump system refrigeration mode pipe connection comprises: the electric compressor is connected with the external heat exchanger through the normally open electromagnetic valve, the external heat exchanger is connected with the internal evaporator through the second electric control expansion valve, and the internal evaporator is connected with the electric compressor through the gas-liquid separator.
The working principle is as follows: the electric compressor is started, high-temperature and high-pressure refrigerant gas generated by the electric compressor enters an outdoor heat exchanger (namely a condenser) through a normally open electromagnetic valve, the high-temperature and high-pressure refrigerant gas is condensed into refrigerant liquid in the outdoor heat exchanger, the refrigerant liquid is throttled into a gas-liquid two-phase refrigerant through a second electric control expansion valve and enters an evaporator in the vehicle, the refrigerant is evaporated in the evaporator in the vehicle to absorb heat, so that air in the vehicle is cooled, the air refrigeration effect is realized, the refrigerated gas-liquid two-phase refrigerant is subjected to gas-liquid two-phase separation through a gas-liquid separator, and then the refrigerant gas returns to the compressor for next cycle work.
Preferably, the heat pump system heating mode pipe connection comprises: the electric compressor is connected with the plate heat exchanger through the normally closed solenoid valve, one end of the plate heat exchanger is connected with the coolant pump to supply coolant, one end of the plate heat exchanger is connected with the heat exchanger in the vehicle to heat indoor air through the coolant exchanged by the plate heat exchanger, the other end of the plate heat exchanger is connected with the heat exchanger outside the vehicle through the first electric control expansion valve, and the heat exchanger outside the vehicle is connected with the electric compressor through the normally closed solenoid valve and the gas-liquid separator in sequence.
The working principle is as follows: the electric compressor is started, high-temperature and high-pressure refrigerant gas generated by the electric compressor enters the plate heat exchanger through the normally closed electromagnetic valve, the cooling liquid input to the plate heat exchanger by the cooling liquid pump exchanges heat with the high-temperature and high-pressure refrigerant gas, the cooling liquid is heated and heats air in the vehicle through the heat exchanger in the vehicle, the heating effect in the vehicle is achieved, at the moment, the refrigerant gas releases heat and is condensed into refrigerant liquid, the refrigerant liquid enters the heat exchanger outside the vehicle through the first electric control expansion valve to absorb heat to become the refrigerant gas, the gas-liquid two-phase refrigerant is subjected to gas-liquid two-phase separation through the gas-liquid separator, and then the refrigerant gas returns to the compressor to perform next cycle work.
Preferably, the heat pump system dehumidification mode pipe connection comprises: the electric compressor is connected with the plate heat exchanger through the normally closed electromagnetic valve, one end of the plate heat exchanger is connected with the cooling liquid pump to supply cooling liquid, the other end of the plate heat exchanger is connected with the heat exchanger in the vehicle to heat indoor air through the cooling liquid exchanged by the plate heat exchanger, and refrigerant after heat exchange by the plate heat exchanger is divided into two loops to return to the electric compressor.
Further, the refrigerant after heat exchange of the plate heat exchanger enters an in-vehicle evaporator through a normally closed electromagnetic valve and a second electronic control expansion valve, and the in-vehicle evaporator is connected with a gas-liquid separator.
Further, the refrigerant after heat exchange of the plate heat exchanger enters the heat exchanger outside the vehicle through the first electric control expansion valve and the one-way stop valve, and the heat exchanger outside the vehicle is connected with the gas-liquid separator through the normally closed electromagnetic valve.
The working principle is as follows: the electric compressor is started, high-temperature and high-pressure refrigerant gas generated by the electric compressor enters a plate heat exchanger (namely a condenser) through a normally closed electromagnetic valve, cooling liquid input to the plate heat exchanger by a cooling liquid pump exchanges heat with the high-temperature and high-pressure refrigerant gas, the cooling liquid is heated and heats air in the vehicle through a heat exchanger in the vehicle, the refrigerant condensed into liquid respectively returns to the electric compressor through two loops, the first loop is throttled into gas-liquid two phases through the normally closed electromagnetic valve and a second electric control expansion valve and enters an evaporator in the vehicle, the refrigerant evaporates and absorbs heat in the evaporator in the vehicle, and moisture in the air is condensed to realize the dehumidification effect; the second one is that the refrigerant is throttled into a gas-liquid two-phase state by a first electric control expansion valve, enters a heat exchanger outside the vehicle to absorb heat by a one-way stop valve, is mixed with the first refrigerant coming out of an evaporator inside the vehicle by a normally closed electromagnetic valve, enters a gas-liquid separator to separate the gas and the liquid of the refrigerant, and returns to the compressor for the next cycle work after separation.
Preferably, the normally open solenoid valve comprises a first normally open solenoid valve and a second normally open solenoid valve; the normally closed solenoid valves comprise a first normally closed solenoid valve, a second normally closed solenoid valve and a third normally closed solenoid valve; the one-way stop valve comprises a first one-way stop valve connected with the first electronic control expansion valve in series and a second one-way stop valve connected with the second normally closed electromagnetic valve in series.
Preferably, a cooling fan is arranged beside the heat exchanger outside the vehicle; and an air blower is arranged beside the evaporator in the automobile.
Preferably, the PTC electric heater is automatically activated in a low-temperature environment to perform heating. The PTC electric heater is driven by high-voltage direct current. When the environment temperature in the vehicle is lower, preferably lower than 5 ℃, the PTC electric heater is automatically started, the air-conditioning heat pump system is closed at the moment, and the PTC electric heater is only used for heating, so that the air-conditioning heat pump system is prevented from frosting and cannot normally run, and the heating requirement can still be met in the low-temperature environment in the vehicle.
Preferably, the first electronic control expansion valve and the second electronic control expansion valve are driven by direct current PWM, and the flow regulation range is 0-100%.
The invention has the following beneficial effects: by adopting the air-conditioning heat pump system with the cooling liquid loop for the new energy automobile, the switching of the air-conditioning heat pump system among the refrigeration, heating and dehumidification operation modes is realized through the switching of the electromagnetic valves, and the normal open and normal close electromagnetic valves are arranged, so that the air-conditioning heat pump system can be ensured to operate in the refrigeration mode even if the electromagnetic valves break down, accidents caused by the ultrahigh pressure operation of the system are avoided, and the safety is improved; the system adopts a cooling liquid loop to realize indirect heating, and a plate heat exchanger is utilized to exchange heat between a high-temperature high-pressure refrigerant and cooling liquid; the PTC electric heater is arranged in the cooling liquid loop to prevent heating at low temperature and in system failure; meanwhile, the traditional automobile HVAC module can be directly used in the heat pump system, the HVAC module does not need to be manufactured again, and the cost is reduced; in the dehumidification mode, the external heat exchanger and the internal evaporator are used simultaneously, and the refrigerant is finally returned to the electric compressor through the two loops after heat release of the plate heat exchanger, in particular, the refrigerant is bypassed, so that the refrigerating capacity flowing into the internal evaporator is reduced, the temperature drop of the introduced air is reduced while the introduced air is dehumidified by the internal evaporator, and the dehumidification and heating requirements are met; the defects of the existing air-conditioning heat pump system are overcome, and good economic and social benefits are achieved.
Drawings
FIG. 1 is a schematic diagram of an air conditioning heat pump system for a new energy automobile with a coolant loop of the invention;
FIG. 2 is a schematic diagram of a refrigeration mode structure of an air-conditioning heat pump system for a new energy automobile with a coolant loop;
FIG. 3 is a structural schematic diagram of a heating mode of the air-conditioning heat pump system for the new energy automobile with a cooling liquid loop;
FIG. 4 is a structural schematic diagram of a dehumidification mode of the air-conditioning heat pump system for the new energy automobile with a cooling liquid loop;
the reference numerals in the figures are respectively:
1. the vehicle-mounted heat exchanger comprises an electric compressor 2, an external heat exchanger 3, a cooling fan 4, an internal evaporator 5, a blower 6, a gas-liquid separator 7, a plate-type heat exchanger 8, a PTC electric heater 9, an internal heat exchanger 10, a cooling liquid expansion tank 11, a cooling liquid pump 12, a first electronic control expansion valve 13, a first one-way stop valve 14, a first normally open electromagnetic valve 15, a first normally closed electromagnetic valve 16, a second normally closed electromagnetic valve 17, a second one-way stop valve 18, a third normally closed electromagnetic valve 19, a second normally open electromagnetic valve 20 and a second electronic control expansion valve
Detailed Description
The invention is further described below with reference to the specific figures.
As shown in fig. 1, a new energy automobile air conditioning heat pump system with a coolant loop is provided, the system mainly includes a heat pump system and a coolant loop system, wherein the heat pump system includes an electric compressor 1, an external heat exchanger 2, a cooling fan 3 disposed beside the external heat exchanger 2, a plate heat exchanger 7, an internal evaporator 4, an air blower 5 disposed beside the internal evaporator 4, an internal heat exchanger 9, a gas-liquid separator 6, a first normally open solenoid valve 14 disposed between the electric compressor 1 and the external heat exchanger 2, a first normally closed solenoid valve 15 disposed between the electric compressor 1 and the plate heat exchanger 7, a second normally open solenoid valve 19 and a second electrically controlled expansion valve 20 disposed between the external heat exchanger 2 and the internal evaporator 4, a third normally closed solenoid valve 18 disposed between the external heat exchanger 2 and the gas-liquid separator 6, a first electrically controlled expansion valve 12 disposed between the plate heat exchanger 7 and the external heat exchanger, a first one-way check valve 13 in series with the first electrically controlled expansion valve 12, a second normally closed solenoid valve 16 and a second normally closed solenoid valve 17 disposed between the plate heat exchanger 7 and the internal evaporator 4; the cooling liquid loop system comprises a cooling liquid pump 11, a cooling liquid expansion water tank 10, a PTC electric heater 8 and a connecting pipeline thereof; a coolant pump 11 is connected to the plate heat exchanger 7. The air-conditioning heat pump system switches the connection relation of the whole heat pump system pipeline by adjusting the opening and closing of the first normally open electromagnetic valve, the second normally open electromagnetic valve, the first normally closed electromagnetic valve, the second normally closed electromagnetic valve and the third normally closed electromagnetic valve, thereby realizing the refrigeration, heating and dehumidification operation modes of the heat pump system. Wherein: the first electronic control expansion valve 12 and the second electronic control expansion valve 20 are driven by direct current PWM, the flow regulation range is 0-100%, the system flow can be timely regulated according to the superheat degree, the complex operation working condition of the automobile can be adapted, and the system consumes less electric power; the cooling liquid loop adopts direct current PWM drive and possesses PTC electric heater 8 of CAN or LIN communication interface, starts supplementary heating when the environment is stable and is less than certain temperature and heat pump system breaks down.
As shown in fig. 2, which is a schematic diagram of a refrigeration mode structure of an air-conditioning heat pump system for a new energy automobile with a coolant loop according to the present invention, when the refrigeration mode is operated: the first normally open electromagnetic valve 14, the second normally open electromagnetic valve 19 are opened (i.e. not energized), the first normally closed electromagnetic valve 15, the second normally closed electromagnetic valve 16, the third normally closed electromagnetic valve 18 are closed (i.e. not energized), the second electronic control expansion valve 20 is used as a throttling element, and the cooling fan 3 and the blower 5 are opened to operate; the electric compressor 1 is started, high-temperature and high-pressure refrigerant gas generated by the electric compressor enters the outdoor heat exchanger 2 (condenser) through the first normally open electromagnetic valve 14, the first one-way stop valve 13 prevents the refrigerant gas from entering the first electronic control expansion valve 12, the high-temperature and high-pressure refrigerant gas releases heat and is condensed into refrigerant liquid, then the refrigerant liquid enters the second electronic control expansion valve 20 through the second normally open electromagnetic valve 19, the refrigerant gas is throttled into a gas-liquid two-phase refrigerant by the second electronic control expansion valve 20 and enters the indoor evaporator 4, the refrigerant evaporates and absorbs heat in the evaporator, so that air in the vehicle is cooled, the air refrigeration effect is realized, the refrigerated gas-liquid two-phase refrigerant passes through the gas-liquid separator 6 to be separated into gas and liquid, the refrigerant gas returns to the electric compressor 1 to perform the next cycle operation, and the heat pump system realizes the continuous refrigeration operation of the air in the vehicle through the cycle operation.
This system is because adopt first normally open solenoid valve 14, and second normally open solenoid valve 19 is opened, and first normally closed solenoid valve 15, second normally closed solenoid valve 16, third normally closed solenoid valve 18 are closed, replaces the used four-way switching-over valve of traditional air conditioning system for when this system takes place for a certain accident situation, under all the solenoid valve drive complete failure condition (for example pencil trouble, solenoid valve fuse fusing etc.) promptly, this system still can work under the refrigeration mode, avoids system's pipeline high pressure operation to lead to bigger trouble, thereby improves the security of system.
As shown in fig. 3, the invention is a structural schematic diagram of a heating mode of an air-conditioning heat pump system for a new energy automobile with a coolant loop, and when the heating mode is operated: the first normally open electromagnetic valve 14 and the second normally open electromagnetic valve are electrified and closed, the first normally closed electromagnetic valve 15 and the third normally closed electromagnetic valve are electrified and opened, the second normally closed electromagnetic valve 16 is closed (namely is not electrified), the first electronic control expansion valve 12 is used as a throttling element, and the cooling fan 3, the blower 5 and the cooling liquid pump 11 run; when the environment temperature in the vehicle is lower than 5 ℃ or the heat pump system fails and stops running, the PTC electric heater is automatically started to supply heat; at the plate type heat exchanger 7, refrigerant gas releases heat and is condensed into refrigerant liquid, the refrigerant liquid sequentially passes through the first electronic control expansion valve 12 and the first one-way stop valve 13, enters the exterior heat exchanger 2 to absorb heat to become refrigerant gas, gas-liquid two-phase refrigerant passes through the gas-liquid separator 6 to be subjected to gas-liquid two-phase separation, the refrigerant gas returns to the electric compressor 1 to perform next cycle work, and the air conditioning heat pump system realizes continuous heating work of air in the vehicle through the cycle work.
As shown in fig. 4, which is a schematic diagram of a dehumidification mode structure of an air-conditioning heat pump system for a new energy automobile with a coolant loop according to the present invention, when the dehumidification mode is in operation: the first normally closed electromagnetic valve 15, the second normally closed electromagnetic valve 16 and the third normally closed electromagnetic valve 18 are electrified and opened, the first normally open electromagnetic valve 14 and the second normally open electromagnetic valve 19 are electrified and closed, the first electronic control expansion valve 12 and the second electronic control expansion valve 20 are used as throttling elements, and the cooling fan 3, the blower 5 and the cooling liquid pump 11 are started and operated. The electric compressor 1 is started, high-temperature and high-pressure refrigerant gas generated by the electric compressor enters the plate heat exchanger 7 through the first normally closed electromagnetic valve 15, cooling liquid input to the plate heat exchanger 7 by the cooling liquid pump 11 exchanges heat with the high-temperature and high-pressure refrigerant gas, the cooling liquid is heated and heats air in the vehicle through the heat exchanger 9 in the vehicle, and when the ambient temperature in the vehicle is lower than 5 ℃ or the heat pump system breaks down and stops running, the PTC electric heater 8 is automatically started to supply heat; the refrigerant condensed into liquid respectively returns to the electric compressor 1 through two loops, wherein the first one of the two loops is throttled into gas-liquid two phase through a second normally closed solenoid valve, a second one-way stop valve 17 and a second electronic control expansion valve 20 and enters the evaporator 4 in the vehicle, the refrigerant evaporates and absorbs heat in the evaporator 4 in the vehicle, and moisture in the air is condensed to realize dehumidification effect; the second loop is that the refrigerant is throttled into a gas-liquid two-phase state through the first electronic control expansion valve 12, the first one-way stop valve 13 enters the heat exchanger 2 outside the vehicle to absorb heat, the refrigerant is mixed with the first refrigerant coming out of the evaporator 4 in the vehicle through the third normally closed electromagnetic valve 18, the mixed refrigerant enters the gas-liquid separator 6 to separate the gas and the liquid of the refrigerant, the separated refrigerant gas returns to the electric compressor 1 to perform the next cycle work, and the air-conditioning heat pump system realizes the continuous dehumidification work of the air in the vehicle through the cycle work. When the system operates in the mode, double evaporators (the evaporator 4 in the automobile and the heat exchanger 2 outside the automobile) are adopted, the condition that the air outlet temperature is lower due to the fact that the refrigerating capacity of the evaporator 4 in the automobile is too large is avoided, the system is provided with two heat sources, the heat source of the air outside the automobile and the heat source of the air in the automobile can recover dehumidification energy, and more heat can be provided while dehumidification is effectively carried out.
The above description is for the purpose of describing the invention in more detail with reference to specific preferred embodiments, and it should not be construed that the embodiments are limited to those described herein, but rather that the invention is susceptible to various modifications and alternative forms without departing from the spirit and scope of the present invention.
Claims (7)
1. The utility model provides an air conditioner heat pump system for new energy automobile with coolant liquid return circuit which characterized in that: comprises a heat pump system and a cooling liquid loop system;
the heat pump system comprises an electric compressor (1) for generating high-temperature and high-pressure refrigerant, an external heat exchanger (2), a plate heat exchanger (7), an internal evaporator (4), an internal heat exchanger (9), a gas-liquid separator (6), a first electronic control expansion valve (12), a second electronic control expansion valve (20), a normally open electromagnetic valve, a normally closed electromagnetic valve, a one-way stop valve and a connecting pipeline thereof; the electric compressor (1) is respectively connected with the external heat exchanger (2) and the plate heat exchanger (7) through a normally open electromagnetic valve and a normally closed electromagnetic valve, the external heat exchanger (2) is connected with the internal evaporator (4) through a second electric control expansion valve (20), the internal heat exchanger (9) is connected with the plate heat exchanger (7), and the gas-liquid separator (6) is arranged in front of the electric compressor (1);
the cooling liquid loop system comprises a cooling liquid pump (11), a cooling liquid expansion water tank (10), a PTC electric heater (8) and a connecting pipeline thereof; the plate heat exchanger (7) is connected with a cooling liquid pump (11);
the heat pump system switches the connection relation of the heat pump system pipelines by adjusting the opening and closing of the normally open electromagnetic valve and the normally closed electromagnetic valve to realize the refrigeration, heating and dehumidification operation modes of the heat pump system;
the heat pump system refrigeration mode pipe connection includes: the electric compressor (1) is connected with the heat exchanger (2) outside the vehicle through a normally open electromagnetic valve, the heat exchanger (2) outside the vehicle is connected with the evaporator (4) inside the vehicle through a second electric control expansion valve (20), and the evaporator (4) inside the vehicle is connected with the electric compressor (1) through a gas-liquid separator (6);
the heat pump system heating mode pipe connection includes: the electric compressor (1) is connected with the plate heat exchanger (7) through a normally closed electromagnetic valve, one end of the plate heat exchanger (7) is connected with a cooling liquid pump (11) for supplying cooling liquid, one end of the plate heat exchanger is connected with the heat exchanger (9) in the vehicle to heat indoor air through the cooling liquid exchanged by the plate heat exchanger (7), the other end of the plate heat exchanger is connected with the heat exchanger (2) outside the vehicle through a first electronic control expansion valve (12), and the heat exchanger (2) outside the vehicle is connected with the electric compressor (1) through the normally closed electromagnetic valve and a gas-liquid separator (6) in sequence;
the heat pump system dehumidification mode pipe connection includes: the electric compressor (1) is connected with the plate heat exchanger (7) through a normally closed solenoid valve, one end of the plate heat exchanger (7) is connected with a cooling liquid pump (11) to supply cooling liquid, the other end of the plate heat exchanger is connected with the heat exchanger (9) in the vehicle to heat indoor air through the cooling liquid exchanged by the plate heat exchanger (7), and refrigerant after heat exchange of the plate heat exchanger (7) is divided into two loops to return to the electric compressor (1).
2. The air-conditioning heat pump system with the cooling liquid loop for the new energy automobile as claimed in claim 1, wherein: refrigerant after heat exchange of the plate heat exchanger (7) enters the in-vehicle evaporator (4) through the normally closed electromagnetic valve and the second electronic control expansion valve (20), and the in-vehicle evaporator (4) is connected with the gas-liquid separator (6).
3. The air-conditioning heat pump system with the cooling liquid loop for the new energy automobile as claimed in claim 1, wherein: refrigerant after heat exchange of the plate heat exchanger (7) enters the external heat exchanger (2) through the first electric control expansion valve (12) and the one-way stop valve, and the external heat exchanger (2) is connected with the gas-liquid separator (6) through the normally closed electromagnetic valve.
4. The air-conditioning heat pump system with the cooling liquid loop for the new energy automobile as claimed in claim 1, wherein: the normally open solenoid valves comprise a first normally open solenoid valve (14) and a second normally open solenoid valve (19); the normally closed electromagnetic valves comprise a first normally closed electromagnetic valve (15), a second normally closed electromagnetic valve (16) and a third normally closed electromagnetic valve (18); the one-way stop valve comprises a first one-way stop valve (13) connected with the first electronic control expansion valve (12) in series and a second one-way stop valve (17) connected with the second normally closed electromagnetic valve (16) in series.
5. The air-conditioning heat pump system with the cooling liquid loop for the new energy automobile is characterized in that: a cooling fan (3) is arranged beside the heat exchanger (2) outside the vehicle; and an air blower (5) is arranged beside the evaporator (4) in the automobile.
6. The air-conditioning heat pump system with the cooling liquid loop for the new energy automobile is characterized in that: the PTC electric heater (8) is automatically started in a low-temperature environment to heat and supply heat.
7. The air-conditioning heat pump system with the cooling liquid loop for the new energy automobile is characterized in that: the first electronic control expansion valve (12) and the second electronic control expansion valve (20) are driven by direct current PWM, and the flow regulation range is 0-100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710227945.0A CN107020915B (en) | 2017-04-10 | 2017-04-10 | Air conditioner heat pump system with coolant liquid return circuit for new energy automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710227945.0A CN107020915B (en) | 2017-04-10 | 2017-04-10 | Air conditioner heat pump system with coolant liquid return circuit for new energy automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107020915A CN107020915A (en) | 2017-08-08 |
| CN107020915B true CN107020915B (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710227945.0A Active CN107020915B (en) | 2017-04-10 | 2017-04-10 | Air conditioner heat pump system with coolant liquid return circuit for new energy automobile |
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