Enthalpy-increasing air conditioning system, electric automobile and control method of enthalpy-increasing air conditioning system

Abstract

According to the enthalpy-increasing air conditioning system, the electric automobile and the control method of the enthalpy-increasing air conditioning system, the enthalpy-increasing air conditioning system can achieve enthalpy increasing of the compressor through the economizer, the energy efficiency ratio of the compressor is effectively improved, meanwhile, the enthalpy-increasing air conditioning system is further provided with the third heat exchanger, heat exchange of a secondary refrigerant and a refrigerant is achieved through the third heat exchanger, and the energy efficiency ratio of the compressor is effectively increased. And the refrigerant returns to the compressor after absorbing the heat of the secondary refrigerant, so that the temperature of the refrigerant at the inlet of the compressor is increased, the compression amount of the compressor is reduced, the energy efficiency ratio of the compressor is further increased, the energy consumption is reduced, and the heating effect of the compressor is improved. And moreover, the electric drive system can be cooled through the third heat exchanger, so that the heat pump system and the secondary refrigerant system are organically combined together, the overall size and weight of the enthalpy-increasing air conditioning system are reduced, and the cruising ability of the electric automobile is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of temperature control equipment, and in particular to an enthalpy-increasing air-conditioning system, an electric vehicle, and a control method for the enthalpy-increasing air-conditioning system. Background Art

[0002] When heating at low temperatures, the existing thermal management air conditioning system of automobiles either uses electric auxiliary heating or circulates refrigerant through compressors, outdoor heat exchangers, outdoor fans, throttle valves, economizers, indoor heat exchangers, indoor fans, etc. to achieve heating of the interior environment of the vehicle. In the process of realizing this application, the inventors found that there are at least the following problems in the prior art: the interior environment of the vehicle needs to be heated by a heat pump system. By setting an economizer-expansion valve, the operating range of the heat pump can be widened and the performance of the compressor can be improved, which is conducive to improving the heating efficiency of the air conditioning system, but the overall energy consumption is still too high. The electric drive system of the whole vehicle needs to circulate the coolant through components such as water pumps, water tanks, heat exchangers, and fans to cool the electric drive system. The two systems operate independently, occupying a large amount of space and increasing the weight of the whole machine. At the same time, the waste heat of the electric drive system is not fully utilized, which causes energy waste to a certain extent. Summary of the invention

[0003] Based on this, the present application provides an enthalpy-increasing air-conditioning system, an electric vehicle and a control method for the enthalpy-increasing air-conditioning system to improve the problems in the prior art of the large overall volume and weight and high energy consumption caused by the inability to organically combine the heat pump system and the refrigerant system.

[0004] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides an enthalpy-increasing air conditioning system, comprising a heat pump system and a refrigerant system;

[0006] The heat pump system is used to circulate refrigerant, and includes a compressor and a first heat exchanger, an economizer, and a second heat exchanger that are cyclically connected to the compressor in sequence to realize a heating cycle; the heat pump system also includes a third heat exchanger and a first expansion valve, the third heat exchanger includes a first channel and a second channel that can exchange heat with each other, one end of the first channel is connected to the inlet of the compressor, and the other end is connected to one end of the first expansion valve, and the other end of the first expansion valve is connected between the economizer and the second heat exchanger; the heat pump system also includes a third expansion valve, the economizer includes a first flow channel and a second flow channel that can exchange heat with each other, the first flow channel is connected between the first heat exchanger and the second heat exchanger, the inlet of the second flow channel is connected in series with the third expansion valve, and the outlet of the second flow channel is connected to the enthalpy increase port of the compressor; the inlet of the third expansion valve is connected between the first flow channel and the second heat exchanger;

[0007] The refrigerant system is used for circulating refrigerant, and includes a heat exchange module. The heat exchange module is used for exchanging heat with the electric drive system, and the heat exchange module is connected in series with the second channel.

[0008] In one embodiment, the heat pump system also includes a four-way reversing valve and a gas-liquid separator, the four-way reversing valve includes a first interface, a second interface, a third interface and a fourth interface; the outlet of the compressor is connected to the first interface, the inlet of the compressor is connected to the outlet of the gas-liquid separator, the inlet of the gas-liquid separator is respectively connected to the fourth interface and one end of the first channel, a port of the second heat exchanger is connected to the second interface, and a port of the first heat exchanger is connected to the third interface.

[0009] In one embodiment, the heat pump system further includes a second expansion valve and a drying filter, and the first flow channel, the second expansion valve and the drying filter are connected in series between the first heat exchanger and the second heat exchanger in sequence; the inlet of the third expansion valve is connected between the first flow channel and the second expansion valve.

[0010] In one embodiment, the coolant system further includes a circulation pump and an expansion water tank, wherein the circulation pump is disposed between the inlet of the heat exchange module and the outlet of the second channel, and the expansion water tank is connected in parallel to the heat exchange module and the circulation pump.

[0011] In one embodiment, the refrigerant system also includes an electric drive radiator and a control valve, the electric drive radiator and the second channel are connected in parallel, and the control valve is used to control the refrigerant flowing out of the heat exchange module to flow to the second channel or to the electric drive radiator.

[0012] In one embodiment, the first heat exchanger is used to be installed in an indoor environment, and the second heat exchanger is used to be installed in an outdoor environment; the second heat exchanger and the electric drive radiator are integrated, and the second heat exchanger and the electric drive radiator work independently.

[0013] In one embodiment, the enthalpy-added air conditioning system also includes an indoor fan and an outdoor fan, the indoor fan is used to increase the air circulation speed at the first heat exchanger, and the outdoor fan is used to increase the air circulation speed at the second heat exchanger and the electric drive radiator.

[0014] In one embodiment, the enthalpy-added air conditioning system further includes a water temperature detection device and a room temperature detection device, wherein the water temperature detection device is used to detect the outlet water temperature of the heat exchange module, and the room temperature detection device is used to detect the indoor ambient temperature of the first heat exchanger.

[0015] In a second aspect, an embodiment of the present application provides an electric vehicle, comprising the enthalpy-added air-conditioning system as described above.

[0016] In a third aspect, an embodiment of the present application provides a control method for an enthalpy-increasing air-conditioning system, which is applied to the enthalpy-increasing air-conditioning system as described above. When the enthalpy-increasing air-conditioning system is in a heating mode, the control method for the enthalpy-increasing air-conditioning system performs the following steps:

[0017] S11, respectively setting the indoor preset temperature T10 and the preset water outlet temperature T13 of the heat exchange module, and executing steps S12 and S14 respectively;

[0018] S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, starting the heat pump system; if not, shutting down the heat pump system;

[0019] Jump to step S13;

[0020] S13, repeating step S12 until the enthalpy-increasing air-conditioning system exits the heating mode;

[0021] S14, real-time detection of the actual outlet water temperature T12 of the heat exchange module to determine whether T12≤T13 is established.

[0022] If yes, determine whether the heat pump system is turned on, and if yes, control the coolant to flow into the second channel and turn on the first expansion valve; if no, keep the current state unchanged;

[0023] If not, controlling the coolant not to flow into the second channel;

[0024] Jump to step S15;

[0025] S15, repeat step S14 until the enthalpy-increasing air conditioning system exits the heating mode

[0026] The present application has at least the following beneficial effects: the compressor enthalpy can be increased through the economizer, so that the energy efficiency ratio of the compressor is effectively improved. At the same time, a third heat exchanger is also provided to realize heat exchange between the refrigerant and the refrigerant through the third heat exchanger, so that the refrigerant absorbs the heat of the refrigerant and returns to the compressor, thereby increasing the refrigerant temperature at the compressor inlet, reducing the compression volume of the compressor, further improving the energy efficiency ratio of the compressor, reducing energy consumption, and improving the heating effect of the compressor. Moreover, the third heat exchanger can also be used to dissipate heat for the electric drive system, so that the heat pump system and the refrigerant system are organically combined, reducing the overall volume and weight of the enthalpy-increasing air-conditioning system, and extending the endurance of the electric vehicle.

[0027] In summary, the present application can effectively improve the problems in the prior art of large overall volume and weight and high energy consumption caused by the inability to organically combine the heat pump system and the refrigerant system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an enthalpy-increasing air-conditioning system according to an embodiment of the present application.

[0029] Figure 2 This is a structural schematic diagram of an enthalpy-increasing air-conditioning system according to another embodiment of the present application.

[0030] Figure 3 Schematic diagram of the circulation flow of the refrigerant and the brine in the heating mode of the enthalpy-added air-conditioning system according to an embodiment of the present application (when T12≤T13).

[0031] Figure 4 for Figure 3 Schematic diagram of the circulation flow of refrigerant and coolant in the enthalpy increase air-conditioning system in heating mode (when T12>T13).

[0032] Figure 5 for Figure 3 Schematic diagram of the circulation flow of refrigerant and coolant in the enthalpy increase air-conditioning system in cooling mode.

[0033] Figure 6 1 is a flow chart of a control method in a heating mode of an enthalpy-increasing air-conditioning system according to an embodiment of the present application.

[0034] Figure 7 1 is a flow chart of a control method in a cooling mode of an enthalpy-increasing air-conditioning system according to an embodiment of the present application.

[0035] Note: Figures 3 to 5 The solid arrows in the figure indicate the refrigerant flow direction, and the dotted arrows indicate the brine flow direction.

[0036] The meanings of the symbols in the accompanying drawings are as follows:

[0037] 1. Heat pump system; 11. Compressor; 12. Four-way reversing valve; 121. First interface; 122. Second interface; 123. Third interface; 124. Fourth interface; 13. Gas-liquid separator; 14. First heat exchanger; 141. Indoor fan; 15. Economizer; 151. First flow channel; 152. Second flow channel; 153. Third expansion valve; 16. Dry filter; 17. Second heat exchanger; 171. Outdoor fan; 172. Second expansion valve; 18. Third heat exchanger; 181. First channel; 182. Second channel; 183. First expansion valve;

[0038] 2. Coolant system; 21. Heat exchange module; 22. Control valve; 221. Inlet; 222. First outlet; 223. Second outlet; 23. Expansion water tank; 24. Circulation pump; 25. Electric drive radiator; 26. Water temperature detection device. DETAILED DESCRIPTION

[0039] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] See also Figure 1 and Figure 2 The enthalpy-increasing air-conditioning system with integrated waste heat recovery function of the embodiment of the present application includes a heat pump system 1 and a refrigerant system 2.

[0044] The heat pump system 1 is used for circulating refrigerant, including a compressor 11 and a first heat exchanger 14, an economizer 15 and a second heat exchanger 17 which are cyclically connected to the compressor 11 in sequence; the heat pump system 1 also includes a third heat exchanger 18 and a first expansion valve 183, the third heat exchanger 18 includes a first channel 181 and a second channel 182 which can exchange heat with each other, the first channel 181 and the first expansion valve 183 are connected in series, the first expansion valve 183 is connected between the economizer 15 and the second heat exchanger 17 through a pipeline, and the first channel 181 is also connected through a first expansion valve 183. The pipeline is connected to the inlet (or suction port) of the compressor 11; it also includes a third expansion valve 153. The economizer 15 includes a first flow channel 151 and a second flow channel 152 that can exchange heat with each other. The first flow channel 151 is connected between the first heat exchanger 14 and the second heat exchanger 17. The inlet of the second flow channel 152 and the third expansion valve 153 are connected in series. The outlet of the second flow channel 152 is connected to the enthalpy increase port of the compressor 11; the inlet of the third expansion valve 153 is connected between the first flow channel 151 and the second heat exchanger 17.

[0045] The refrigerant system 2 is used to circulate the refrigerant, and includes a heat exchange module 21. The heat exchange module 21 is used to exchange heat with the electric drive system. The heat exchange module 21 is connected in series with the second channel 182. The electric drive system includes a motor and an electronic control component that require thermal management. The refrigerant in the first channel 181 and the refrigerant in the second channel 182 can exchange heat at the third heat exchanger 18 to achieve heat dissipation of the electric drive system. Among them, the first heat exchanger 14 is located indoors (or inside the car, that is, on the indoor side), and the second heat exchanger 17 is located outdoors (or outside the car, that is, on the outdoor side). Please refer to Figure 1 In the heating mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 can flow into the first heat exchanger 14, release heat to the outside and condense in the first heat exchanger 14, so that the indoor air (or gas) is heated up, and the condensed refrigerant can be divided into three paths after passing through the first flow channel 151: the refrigerant in the first branch flows into the second heat exchanger 17, absorbs heat in the second heat exchanger 17 and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then flows back to the compressor 11 for the next heating cycle; the refrigerant in the second branch flows into the first channel 181 after being throttled by the first expansion valve 183, absorbs the heat of the refrigerant in the second channel 182 and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then flows back to the compressor 11; the refrigerant in the third branch flows into the second flow channel 152 after being throttled by the third expansion valve 153, absorbs the heat of the refrigerant in the first flow channel 151 and evaporates into a low-temperature and low-pressure gaseous refrigerant, and flows back to the compressor 11 through the enthalpy increase port. It can be understood that one end of the first channel 181 is connected to the inlet of the compressor 11 , and the other end is connected to one end of the first expansion valve 183 , and the other end of the first expansion valve 183 is connected between the economizer 15 and the second heat exchanger 17 .

[0046] Specifically, in this embodiment, the heat pump system 1 also includes a four-way reversing valve 12, a gas-liquid separator 13, a second expansion valve 172, a third expansion valve 153 and a drying filter 16. The first expansion valve 183, the second expansion valve 172 and the third expansion valve 153 can be, for example, electronic expansion valves. The economizer 15 includes a first flow channel 151 and a second flow channel 152 that can exchange heat with each other. The first flow channel 151, the second expansion valve 172 and the drying filter 16 are connected in series between the first heat exchanger 14 and the second heat exchanger 17 in sequence. The inlet of the second flow channel 152 is connected in series with the third expansion valve 153, and the outlet of the second flow channel 152 is connected to the enthalpy increase port of the compressor 11. The inlet of the third expansion valve 153 is connected between the first flow channel 151 and the second expansion valve 172. The four-way reversing valve 12 includes a first interface 121, a second interface 122, a third interface 123 and a fourth interface 124; the outlet (or exhaust port) of the compressor 11 is connected to the first interface 121, the inlet of the compressor 11 is connected to the outlet of the gas-liquid separator 13, the inlet of the gas-liquid separator 13 is respectively connected to the fourth interface 124 and one end of the first channel 181, a port of the second heat exchanger 17 (the port away from the drying filter 16) is connected to the second interface 122, and a port of the first heat exchanger 14 (the port away from the economizer 15) is connected to the third interface 123. The inlet of the first channel 181 of the third heat exchanger 18 is connected to the first expansion valve 183, the outlet of the first channel 181 is connected between the gas-liquid separator 13 and the fourth interface 124, and the inlet 221 of the first expansion valve 183 is connected between the first flow channel 151 and the second expansion valve 172.

[0047] The refrigerant system 2 of the embodiment of the present application also includes a circulation pump 24 and an expansion water tank 23. The circulation pump 24 is arranged between the inlet of the heat exchange module 21 and the outlet of the second channel 182. The expansion water tank 23 is connected in parallel with the heat exchange module 21 and the circulation pump 24. The refrigerant system 2 may also include an electric drive radiator 25 and a control valve 22. The electric drive radiator 25 of the present embodiment is a coil radiator. The electric drive radiator 25 is connected in parallel with the second channel 182. The control valve 22 is used to control the refrigerant flowing out of the heat exchange module 21 to flow to the second channel 182 or to the electric drive radiator 25. Specifically, in the present embodiment, the control valve 22 is an electric three-way valve, including an inlet 221 and two outlets, and the two outlets are a first outlet 222 and a second outlet 223. The inlet 221 is connected to the outlet of the heat exchange module 21, the first outlet 222 is connected to the inlet of the second channel 182, and the second outlet 223 is connected to the inlet of the electric drive radiator 25. The outlet of the electric drive radiator 25 is connected between the inlet of the circulating pump 24 and the outlet of the second channel 182. The purpose of setting the third heat exchanger 18 is to recycle the heat of the electric drive system to increase the temperature of the refrigerant flowing back to the compressor 11, that is, to increase the temperature of the refrigerant at the inlet of the compressor 11, thereby reducing the compression of the compressor 11, improving the energy efficiency ratio of the compressor 11, and thus reducing energy consumption, and at the same time, enhancing the heating effect of the compressor 11. On the other hand, while recycling the heat of the electric drive system, the heat dissipation of the electric drive system is also achieved, so that the two systems are organically combined and the volume and weight of the whole machine are reduced. The electric drive radiator 25 is set to achieve the purpose of heat dissipation and cooling of the electric drive system through the electric drive radiator 25 when the third heat exchanger 18 cannot meet the heat dissipation requirements of the electric drive system. The flow direction of the coolant can be flexibly adjusted by the control valve 22 to provide different heat dissipation methods for the electric drive system. The outlet of the expansion water tank 23 is connected between the outlet of the second channel 182 and the inlet of the circulation pump 24, and the inlet of the expansion water tank 23 is connected between the inlet of the second channel 182 and the outlet of the heat exchange module 21. The expansion water tank 23 is connected in parallel with the heat exchange module 21 and the circulation pump 24, and can replenish the coolant system 2 before the circulation pump 24 discharges water, and can also play a role in exhausting gas after the heat exchange module 21 discharges liquid.

[0048] The first heat exchanger 14 is used to be installed in an indoor environment, and the second heat exchanger 17 is used to be installed in an outdoor environment. In this embodiment, the second heat exchanger 17 and the electric drive radiator 25 are integrated, and the second heat exchanger 17 and the electric drive radiator 25 work independently and do not interfere with each other. An indoor fan 141 is provided at the first heat exchanger 14, and the indoor fan 141 is used to increase the air circulation speed at the first heat exchanger 14. An outdoor fan 171 is provided at the electric drive radiator 25 and the second heat exchanger 17. The outdoor fan 171 is used to increase the air circulation speed at the second heat exchanger 17 and the electric drive radiator 25. The second heat exchanger 17 and the electric drive radiator 25 are integrated, and share the outdoor fan 171, which further reduces the application of components, reduces the volume of the whole machine, and reduces the equipment investment cost.

[0049] The enthalpy-added air conditioning system of this embodiment can be used for both cooling and heating, including cooling mode and heating mode. When operating in the heating mode, first, the first interface 121 and the third interface 123 of the four-way reversing valve 12 are connected, and the second interface 122 and the fourth interface 124 are connected. The low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam (or gaseous refrigerant) by the compressor 11, and enters the first heat exchanger 14 after passing through the first interface 121 and the third interface 123 of the four-way reversing valve 12. It exchanges heat with the indoor gas through the forced convection of the indoor fan 141. The indoor gas absorbs heat and heats up. The refrigerant releases heat and condenses into medium-temperature and high-pressure liquid refrigerant. It enters the first flow channel 151 of the economizer 15 and the refrigerant after the third expansion valve 153 (the refrigerant in the second flow channel 152) is further cooled (supercooled) by heat exchange, as shown in FIG. Figure 2As shown, at this time, the refrigerant can be divided into three paths. The refrigerant in the first branch is throttled into a low-temperature and low-pressure liquid refrigerant (or a gas-liquid mixture) by the second expansion valve 172, and enters the second heat exchanger 17 through the drying filter 16. The refrigerant in the second heat exchanger 17 exchanges heat with the outdoor air through the forced convection of the outdoor fan 171, and forms a low-temperature and low-pressure gaseous refrigerant after absorbing heat and evaporating. The low-temperature and low-pressure gaseous refrigerant passes through the second interface 122 and the fourth interface 124 and then reaches the entrance of the gas-liquid separator 13, mixes with the refrigerant in the second branch, and then enters the gas-liquid separator 13 together and returns to the compressor 11. The refrigerant in the second branch is throttled to a low-temperature, low-pressure liquid refrigerant (or a gas-liquid mixture) by the first expansion valve 183, enters the first channel 181 of the third heat exchanger 18, absorbs the heat of the refrigerant, evaporates to a low-temperature, low-pressure gaseous refrigerant, and directly reaches the inlet of the gas-liquid separator 13, mixes with the refrigerant in the first branch, enters the gas-liquid separator 13 together, and then returns to the compressor 11. The refrigerant in the third branch is throttled to a low-temperature, low-pressure liquid refrigerant (or a gas-liquid mixture) by the third expansion valve 153, enters the second flow channel 152 of the economizer 15, absorbs the heat of the refrigerant in the first flow channel 151, evaporates to a low-temperature, low-pressure gaseous refrigerant, and directly enters the enthalpy increase port of the compressor 11, completing a heating cycle. When the heat pump system 1 of this embodiment is heating, the second expansion valve 172 and the third expansion valve 153 are always open, and the first expansion valve 183 is opened or closed according to the specific situation. When the first expansion valve 183 is closed, the refrigerant after passing through the first flow channel 151 of the economizer 15 is divided into two paths and flows back to the compressor 11 (such as Figure 4 shown).

[0050] like Figure 5 As shown, when the enthalpy-added air-conditioning system of this embodiment is in the cooling mode, first, the first expansion valve 183 and the third expansion valve 153 are closed, and the first interface 121 and the second interface 122 of the four-way reversing valve 12 are connected, and the third interface 123 and the fourth interface 124 are connected, and the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor 11, and enters the second heat exchanger 17 after passing through the first interface 121 and the second interface 122 of the four-way reversing valve 12, and performs heat exchange with the outdoor air through the forced convection of the outdoor fan 171. After releasing heat, the refrigerant condenses into medium-temperature and high-pressure liquid refrigerant, passes through the drying filter 16, and enters the first flow channel 151 of the economizer 15 after throttling by the second expansion valve 172, and then enters the first heat exchanger 14. The refrigerant in the first heat exchanger 14 exchanges heat with the indoor air through forced convection of the indoor fan 141, absorbs heat and evaporates to form a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the gas-liquid separator 13 through the third interface 123 and the fourth interface 124, and then returns to the compressor 11, completing a refrigeration cycle.

[0051] like Figure 1 In order to improve the automation level of the enthalpy-added air conditioning system of the embodiment of the present application, the enthalpy-added air conditioning system may further include a water temperature detection device 26 and a room temperature detection device (not shown), the water temperature detection device 26 is used to detect the outlet water temperature of the heat exchange module 21, and the room temperature detection device is used to detect the indoor environment temperature where the first heat exchanger 14 is located. The water temperature detection device 26 and the room temperature detection device may be temperature sensors respectively, the water temperature detection device 26 may be arranged between the outlet of the heat exchange module 21 and the inlet of the control valve 22, and the room temperature detection device may be arranged near the first heat exchanger 14.

[0052] An embodiment of the present application also provides an electric vehicle, comprising the enthalpy-added air-conditioning system of the above embodiment.

[0053] The embodiment of the present application also provides a control method for an enthalpy-increasing air-conditioning system, which is applied to the above-mentioned enthalpy-increasing air-conditioning system.

[0054] Specifically, when the controller controls the enthalpy-added air conditioning system to enter the heating mode, the enthalpy-added air conditioning system enters the standby mode and performs the following steps:

[0055] S11. Set the preset indoor temperature T10 and the preset water outlet temperature T13 of the heat exchange module 21 respectively, and execute steps S12 and S14 respectively.

[0056] S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, the heat pump system 1 is started; if not, the heat pump system 1 is shut down;

[0057] Jump to step S13.

[0058] S13, repeating step S12 until the enthalpy-increasing air-conditioning system exits the heating mode;

[0059] S14, real-time detection of the actual outlet water temperature T12 of the heat exchange module 21, and determination of whether T12≤T13 is established.

[0060] If yes, it is determined whether the heat pump system 1 is turned on. If yes, the coolant is controlled to flow into the second channel 182 and the first expansion valve 183 is turned on. If no, the current state is maintained unchanged.

[0061] If not, the coolant is controlled not to flow into the second channel 182;

[0062] Jump to step S15;

[0063] S15. Repeat step S14 until the enthalpy-increasing air-conditioning system exits the heating mode.

[0064] Specifically, this embodiment takes the enthalpy-increasing air conditioning system including the control valve 22 and the electric drive radiator 25 structure as an example for explanation. When the enthalpy-increasing air conditioning system does not include the control valve 22 and the electric drive radiator 25 structure, there is no need to perform corresponding control adjustments, and other control methods remain unchanged. Figure 6 As shown, after the controller controls the enthalpy-added air conditioning system to enter the heating mode, the enthalpy-added air conditioning system enters the standby mode and performs the following steps:

[0065] S11. Set the preset indoor temperature T10 and the preset water outlet temperature T13 of the heat exchange module 21 respectively, and execute steps S12 and S14 respectively.

[0066] The preset indoor temperature T10 can be set as needed; the preset outlet water temperature T13 of the heat exchange module 2121 can also be specifically set as needed, and the preset outlet water temperature T13 of the heat exchange module 2121 can be set to 30°C, for example.

[0067] S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, the heat pump system 1 is started; if not, the heat pump system 1 is shut down;

[0068] Jump to step S13.

[0069] The purpose of this step is to determine whether the actual indoor temperature T11 is lower than the indoor preset temperature T10. If it is lower than the indoor preset temperature T10, the indoor temperature needs to be heated. If it is not lower than the indoor preset temperature T10, the indoor temperature does not need to be heated. When the controller does not control the enthalpy increase air-conditioning system to exit the heating mode, it remains in the current standby state.

[0070] S13, repeat step S12 until the enthalpy-increasing air-conditioning system exits the heating mode.

[0071] The purpose of this step is to monitor the actual indoor temperature T11 in real time. As long as the enthalpy-added air-conditioning system is still in the heating mode, the actual indoor temperature T11 will be continuously detected. As long as it is lower than T10, heating will be started, and heating will be stopped if it is not lower than T10. After the enthalpy-added air-conditioning system exits the heating mode, step S12 will also stop, and the enthalpy-added air-conditioning system exits the standby mode and no longer monitors the real-time indoor temperature T11 in real time.

[0072] S14, real-time detection of the actual outlet water temperature T12 of the heat exchange module 21, and determination of whether T12≤T13 is established.

[0073] If yes, it is determined whether the heat pump system 1 is turned on. If yes, the coolant is controlled to flow into the second channel 182, and the first expansion valve 183 and the circulation pump 24 are turned on. If no, the current state is maintained unchanged. The refrigerant and coolant flow directions at this time are as follows: Figure 3 As shown;

[0074] If not, the coolant is controlled to flow into the electric drive radiator 25, the outdoor fan 171 and the circulation pump 24 are turned on, and the first expansion valve 183 is closed; at this time, the refrigerant and the coolant flow direction are as follows: Figure 4 shown.

[0075] Jump to step S15.

[0076] The purpose of this step is that when the actual outlet water temperature T12 of the heat exchange module 21 is lower than the preset outlet water temperature T13, the first expansion valve 183 can be opened to allow the refrigerant to pass through the third heat exchanger 18 and exchange heat with the coolant, so that the temperature of the electric drive system is reduced, and the heat of the electric drive system is recovered to the heat pump system 1. If the actual outlet water temperature T12 is not lower than the preset outlet water temperature T13, the heat can be dissipated through the electric drive radiator 25. At this time, it can be considered that the heat exchange capacity of the third heat exchanger 18 cannot meet the heat dissipation requirements of the electric drive system, and the first expansion valve 183 needs to be closed so that the refrigerant does not pass through the third heat exchanger 18, and the coolant does not pass through the third heat exchanger 18, but flows into the electric drive radiator 25. The coolant exchanges heat with the outdoor air through the electric drive radiator 25, and the temperature is reduced. At the same time, the waste heat of the electric drive system needs to be recovered through the third heat exchanger 18 only when the heat pump system 1 is turned on (heating). Therefore, when the heat pump system 1 of the enthalpy-added air-conditioning system is turned off, there is no need to start the first expansion valve 183, and the refrigerant does not flow at this time.

[0077] S15. Repeat step S14 until the enthalpy-increasing air-conditioning system exits the heating mode.

[0078] The purpose of this step is to monitor the actual outlet water temperature T12 of the heat exchange module 21 in real time. As long as the enthalpy increase air-conditioning system is still in the heating mode, the actual outlet water temperature T12 of the heat exchange module 21 is detected. If it is higher than T13, the refrigerant is cooled by the electric drive radiator 25. If it is not higher than T13, it is divided into two situations. If the system is still in the heating state, the refrigerant is cooled by the third heat exchanger 18. If the system is not in the heating state (standby state), the current state is maintained without adjustment. When the enthalpy increase air-conditioning system exits the heating mode, step S14 also stops.

[0079] like Figure 7 As shown, after the controller controls the enthalpy-added air conditioning system to enter the cooling mode, the enthalpy-added air conditioning system enters the standby mode, closes the first expansion valve 183 and the third expansion valve 153, and performs the following steps:

[0080] S21. Set the preset indoor temperature T20 and the preset water outlet temperature T23 of the heat exchange module 21 respectively, and execute steps S22 and S24 respectively.

[0081] The indoor preset temperature T20 can be set as needed, and the preset outlet water temperature T23 of the heat exchange module 21 can also be specifically set as needed. For example, the preset outlet water temperature T23 of the heat exchange module 21 can be set to 30°C.

[0082] S22. Turn on the indoor fan 141 of the first heat exchanger 14. The indoor fan 141 operates in the ventilation mode, and the actual indoor temperature T21 is detected in real time. Then, it is judged whether T20 < T21 holds. If so, start the refrigerant circulation circuit; if not, close the refrigerant circulation circuit;

[0083] Jump to step S23.

[0084] The purpose of this step is to judge whether the actual indoor temperature T21 is higher than the indoor preset temperature T20. If it is higher than the indoor preset temperature T20, it is necessary to cool the indoor environment. If it is not higher than the indoor preset temperature T20, there is no need to cool the indoor environment, and the standby state is maintained.

[0085] S23. Repeat step S22 until the vehicle-mounted air conditioner exits the cooling mode.

[0086] The purpose of this step is to monitor the actual indoor temperature T21 in real time. As long as the heat pump air-conditioning system is still in the cooling mode, the actual indoor temperature T21 is continuously detected. If it is higher than T20, cooling is carried out; if it is not higher than T20, cooling stops. When the heat pump air-conditioning system exits the cooling mode, step S22 also stops, and the actual indoor temperature T21 is no longer monitored in real time.

[0087] S24. Detect the actual outlet water temperature T22 of the heat exchange module 21 in real time, and judge whether T22 > T23 holds. If so, control the opening of the inlet 221 and the second outlet 223 of the control valve 22, control the closing of the first outlet 222 of the control valve 22, turn on the outdoor fan 171 and the circulation pump 24 of the electric drive radiator 25, so that the coolant does not flow into the second channel 182, but flows into the electric drive radiator 25, and the outdoor fan 171 cools the electric drive radiator 25. If not, keep the current state unchanged and no adjustment is required.

[0088] Jump to step S25.

[0089] The purpose of this step is to detect the actual outlet water temperature T22 of the heat exchange module 21 in the cooling mode. If the detection result is higher than the preset outlet water temperature T23 of the heat exchange module 21, it is necessary to dissipate heat through the electric drive radiator 25. At this time, the waste heat recovery component and the economizer 15 do not work for enthalpy increase. When the actual outlet water temperature T22 of the heat exchange module 21 is not higher than the preset outlet water temperature T23 of the heat exchange module 21, there is no need to dissipate heat from the electric drive system, and the current state can be kept unchanged.

[0090] S25. Repeat step S24 until the electric drive system is shut down.

[0091] This step is to monitor the actual water outlet temperature T22 of the heat exchange module 21 in real time. As long as the electric drive system of the enthalpy increase air-conditioning system is still in working condition, the actual water outlet temperature T22 of the heat exchange module 21 is always detected. If it is higher than T23, the coolant is cooled through the electric drive radiator 25. If it is not higher than T23, the current state is maintained without adjustment. When the electric drive system is turned off, step S24 is also stopped.

[0092] The flow direction of the refrigerant and coolant in the enthalpy-added air conditioning system in cooling mode is as follows: Figure 5 shown.

[0093] In some embodiments, the enthalpy-added air conditioning system may further include a ventilation mode. When the enthalpy-added air conditioning system is in the ventilation mode, only the indoor fan 141 is turned on, the heat pump system 1 is not started, and steps S24 and S25 are executed for heat dissipation of the electric drive system.

[0094] When the enthalpy-added air-conditioning system is in cooling mode or ventilation mode, the heat pump system 1 and the refrigerant system 2 work independently of each other. At this time, the heat recovery work of the electric drive system is not required, but the heat dissipation work of the electric drive system can still proceed normally.

[0095] It can be understood that the vehicle air conditioner with integrated waste heat recovery function provided in the embodiment of the present application also includes a controller, which stores control instructions. When the control instructions are executed by the controller, the above-mentioned control method can be implemented, that is, the vehicle air conditioner can be controlled by the controller to operate according to the above-mentioned control method.

[0096] As can be seen from the above, the enthalpy-increasing air-conditioning system, electric vehicle and control method of the enthalpy-increasing air-conditioning system provided by the embodiment of the present application organically combine the heat pump system and the refrigerant system. When the heat pump system is heating, it can make full use of the heat absorbed by the refrigerant system from the electric drive system, and can increase the refrigerant temperature at the compressor inlet, thereby reducing the compression volume of the compressor, so that the energy efficiency ratio of the compressor is effectively improved, and the outdoor temperature application range of the heat pump system during low-temperature heating is widened. At the same time, while absorbing heat, the temperature of the refrigerant is reduced, and the cooling of the electric drive system is achieved, so that the electric drive system is maintained at an optimal temperature. The organic combination of the two effectively reduces the overall volume and weight of the whole machine, reduces the investment in components, reduces the overall investment cost of the equipment, and consumes less power, effectively reduces energy consumption, and extends the endurance of the electric vehicle. At the same time, the respective functions of the heat pump system and the refrigerant system remain intact, and the heat dissipation of the electric drive system can be achieved when the interior of the vehicle body is heated or cooled. In summary, the present application can effectively improve the problems in the prior art of large overall volume and weight and high energy consumption caused by the inability to organically combine the heat pump system and the refrigerant system.

[0097] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0098] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An enthalpy-increasing air conditioning system, characterized in that: Including heat pump system and refrigerant system; The heat pump system is used to circulate refrigerant, and includes a compressor and a first heat exchanger, an economizer, and a second heat exchanger that are cyclically connected to the compressor in sequence to realize a heating cycle; the heat pump system also includes a third heat exchanger and a first expansion valve, the third heat exchanger includes a first channel and a second channel that can exchange heat with each other, one end of the first channel is connected to the inlet of the compressor, and the other end is connected to one end of the first expansion valve, and the other end of the first expansion valve is connected between the economizer and the second heat exchanger; the heat pump system also includes a third expansion valve, the economizer includes a first flow channel and a second flow channel that can exchange heat with each other, the first flow channel is connected between the first heat exchanger and the second heat exchanger, the inlet of the second flow channel is connected in series with the third expansion valve, and the outlet of the second flow channel is connected to the enthalpy increase port of the compressor; the inlet of the third expansion valve is connected between the first flow channel and the second heat exchanger; The refrigerant system is used for circulating refrigerant, and includes a heat exchange module. The heat exchange module is used for exchanging heat with the electric drive system, and the heat exchange module is connected in series with the second channel.

2. The enthalpy-increasing air conditioning system according to claim 1, characterized in that: The heat pump system also includes a four-way reversing valve and a gas-liquid separator, the four-way reversing valve includes a first interface, a second interface, a third interface and a fourth interface; the outlet of the compressor is connected to the first interface, the inlet of the compressor is connected to the outlet of the gas-liquid separator, the inlet of the gas-liquid separator is respectively connected to the fourth interface and one end of the first channel, a port of the second heat exchanger is connected to the second interface, and a port of the first heat exchanger is connected to the third interface.

3. The enthalpy-increasing air conditioning system according to claim 2, characterized in that: The heat pump system also includes a second expansion valve and a drying filter. The first flow channel, the second expansion valve and the drying filter are connected in series between the first heat exchanger and the second heat exchanger in sequence. The inlet of the third expansion valve is connected between the first flow channel and the second expansion valve.

4. The enthalpy-increasing air conditioning system according to claim 1, characterized in that: The coolant system further includes a circulation pump and an expansion water tank. The circulation pump is arranged between the inlet of the heat exchange module and the outlet of the second channel. The expansion water tank is connected in parallel with the heat exchange module and the circulation pump.

5. The enthalpy-increasing air conditioning system according to claim 4, characterized in that: The refrigerant system also includes an electric drive radiator and a control valve. The electric drive radiator is connected in parallel to the second channel. The control valve is used to control the refrigerant flowing out of the heat exchange module to flow to the second channel or to the electric drive radiator.

6. The enthalpy-increasing air conditioning system according to claim 1, characterized in that: The first heat exchanger is used to be installed in an indoor environment, and the second heat exchanger is used to be installed in an outdoor environment; the second heat exchanger and the electric drive radiator are integrated, and the second heat exchanger and the electric drive radiator work independently.

7. The enthalpy-increasing air conditioning system according to claim 6, characterized in that: It also includes an indoor fan and an outdoor fan. The indoor fan is used to increase the air circulation speed at the first heat exchanger, and the outdoor fan is used to increase the air circulation speed at the second heat exchanger and the electric drive radiator.

8. The enthalpy-increasing air conditioning system according to claim 7, characterized in that: It also includes a water temperature detection device and a room temperature detection device, wherein the water temperature detection device is used to detect the outlet water temperature of the heat exchange module, and the room temperature detection device is used to detect the indoor environment temperature where the first heat exchanger is located.

9. An electric vehicle, characterized in that: It comprises the enthalpy-added air conditioning system as described in any one of claims 1 to 8.

10. A control method for an enthalpy-increasing air conditioning system, characterized in that: Applied to the enthalpy-added air conditioning system according to any one of claims 1 to 8, the control method of the enthalpy-added air conditioning system, when the enthalpy-added air conditioning system is in a heating mode, performs the following steps: S11, respectively setting the indoor preset temperature T10 and the preset water outlet temperature T13 of the heat exchange module, and executing steps S12 and S14 respectively; S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, starting the heat pump system; if not, shutting down the heat pump system; Jump to step S13; S13, repeating step S12 until the enthalpy-increasing air-conditioning system exits the heating mode; S14, real-time detection of the actual outlet water temperature T12 of the heat exchange module to determine whether T12≤T13 is established. If yes, determine whether the heat pump system is turned on, and if yes, control the coolant to flow into the second channel and turn on the first expansion valve; if no, keep the current state unchanged; If not, controlling the coolant not to flow into the second channel; Jump to step S15; S15. Repeat step S14 until the enthalpy-increasing air-conditioning system exits the heating mode.

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