CN111750561B

CN111750561B - Heat pump system

Info

Publication number: CN111750561B
Application number: CN201910251898.2A
Authority: CN
Inventors: 董军启; 贾世伟; 刘巧凤; 其他发明人请求不公开姓名
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2022-03-01
Anticipated expiration: 2039-03-29
Also published as: CN111750561A

Abstract

The application discloses heat pump system, heat pump system is under the heating mode: the compressor, the first indoor heat exchanger, the flow regulating device, the outdoor heat exchanger and the gas-liquid separator are communicated to form a first loop; the battery pack, the first pump and the first heat exchanger are communicated and form a second loop; the compressor, the first indoor heat exchanger, the first heat exchanger and the gas-liquid separator are communicated to form a third loop, and the third loop absorbs heat of the second loop through the first heat exchanger. The heat pump system heats through the first loop under the heating mode, the third loop can absorb the heat of the second loop through the first heat exchanger to the heat that the battery pack in the coolant circulation loop produced is transferred to the refrigerant circulation loop, and therefore the heat pump system is not only favorable for the heat dissipation of the battery pack, but also can improve the heating capacity of the whole heat pump system and improve the energy efficiency.

Description

Heat pump system

Technical Field

The application relates to the technical field of heat management, in particular to a heat pump system.

Background

With the high-speed development of new energy automobiles, heat pump systems are more and more valued by automobile host factories. In a new energy automobile air conditioning system, a heat pump system is a device for cooling, heating, ventilating, purifying air and the like of air in a carriage. The automobile seat cushion can provide a comfortable riding environment for passengers, reduce the fatigue strength of a driver and improve the driving safety.

The automobile heat pump system can realize the interconversion of modes such as refrigeration, heating, and under various working conditions of the heat pump system, some components and parts can generate heat in the working process, but the heat pump system related to the components and parts can not fully carry out heat management and efficient utilization on the heat generated by the components and parts, so that the energy is wasted.

Disclosure of Invention

In view of the above, the present application provides a heat pump system capable of recovering heat to solve the above technical problems.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

according to an embodiment of the present application, there is provided a heat pump system including: a refrigerant circulation circuit and a coolant circulation circuit, the refrigerant circulation circuit including a compressor, a first indoor heat exchanger, an outdoor heat exchanger, a flow rate adjusting device, and a gas-liquid separator; the coolant circulation loop comprises a battery pack, a first pump and a first heat exchanger;

the heat pump system comprises a heating mode, and in the heating mode:

the compressor, the first indoor heat exchanger, the flow regulating device, the outdoor heat exchanger and the gas-liquid separator are communicated to form a first loop;

the battery pack, the first pump and the first heat exchanger are communicated and form a second loop;

the first heat exchanger is connected with the flow regulating device in parallel, the compressor, the first indoor heat exchanger, the first heat exchanger and the gas-liquid separator are communicated to form a third loop, and the third loop absorbs heat of the second loop through the first heat exchanger.

Optionally, the coolant circulation loop further comprises an electric machine set, a second heat exchanger and a second pump, and the heat pump system is in a heating mode:

the motor set, the second pump and the second heat exchanger are communicated to form a fourth loop, the second heat exchanger is connected between an outlet of the outdoor heat exchanger and an inlet of the gas-liquid separator, and the first loop absorbs heat of the fourth loop through the second heat exchanger.

Optionally, the coolant circulation circuit further comprises a bypass branch in parallel with the second heat exchanger, and the heat pump system is in a heating mode: the motor set, the second pump and the bypass branch are communicated to form a fifth loop.

Optionally, the coolant circulation circuit further comprises: and the bypass branch is communicated with the third valve control, and the fourth loop and the fifth loop are intersected at the third valve control.

Optionally, the heat pump system includes a cooling mode, in which the second circuit is connected, and both the fourth circuit and the fifth circuit are disconnected;

the coolant circulation circuit further comprises a radiator connected in parallel with the second heat exchanger, the heat pump system being in a cooling mode: the motor pack, the second pump, the radiator, and the third valve control communicate to form a sixth loop.

Optionally, the heat pump system further comprises a battery charge cooling mode, and the coolant circulation circuit further comprises: the first valve control is connected between the battery pack and the first heat exchanger, the second valve control is connected between the motor pack and the second pump, and the fourth valve control is connected between the third valve control and the second heat exchanger;

in the cooling mode: the motor block, second valve control, second pump, radiator, fourth valve control, and third valve control are in communication to form a loop;

in a battery charge cooling mode: the refrigerant circulation circuit, the second circuit, the fourth circuit and the fifth circuit are all disconnected, and the first pump, the second valve control, the second pump, the radiator, the fourth valve control, the third valve control, the first valve control and the battery pack are communicated to form a seventh circuit.

Optionally, the heat pump system further comprises a battery warm-up mode, the coolant circulation loop further comprises a heater connected in series with the second heat exchanger, the heat pump system in the battery warm-up mode:

the refrigerant circulation circuit, the second circuit, the fourth circuit, the fifth circuit, the sixth circuit and the seventh circuit are all disconnected, and the first pump, the second valve control, the second pump, the second heat exchanger, the heater, the fourth valve control, the third valve control, the first valve control and the battery pack are communicated to form an eighth circuit.

Optionally, the refrigerant circulation circuit comprises a fluid switching device comprising a first port, a second port, a third port and a fourth port, the heat pump system in a heating mode:

the first port is communicated with the fourth port, the second port is communicated with the third port, the first port is communicated with an outlet of the outdoor heat exchanger, the second port is communicated with an outlet of the first indoor heat exchanger, the third port is respectively communicated with the flow regulating device and an inlet of the gas-liquid separator, and the fourth port is communicated with an inlet of the gas-liquid separator;

wherein the first heat exchanger is connected between the third port of the fluid switching device and the gas-liquid separator, and the second heat exchanger is connected between the fourth port of the fluid switching device and the gas-liquid separator.

the first port is communicated with the fourth port, the second port is communicated with the third port, the first port is communicated with an inlet of the gas-liquid separator, the second port is communicated with an outlet of the first indoor heat exchanger, the third port is respectively communicated with inlets of the flow regulating device and the gas-liquid separator, and the fourth port is communicated with an outlet of the outdoor heat exchanger;

wherein the first heat exchanger is connected between the third port of the fluid switching device and the gas-liquid separator, and the second heat exchanger is connected between the fourth port of the fluid switching device and the outdoor heat exchanger.

Optionally, the refrigerant circulation circuit further includes a second indoor heat exchanger and a throttling element, the second indoor heat exchanger and the first heat exchanger are arranged in parallel, the first heat exchanger is connected with the outlet of the flow regulating device, the throttling element is connected with the inlet of the second indoor heat exchanger, and the heat pump system is in a cooling mode:

the first port of the fluid switching device is communicated with the second port, and the compressor, the first indoor heat exchanger, the fluid switching device, the outdoor heat exchanger, the flow regulating device, the throttling element, the second indoor heat exchanger and the gas-liquid separator are communicated to form a loop.

Optionally, the flow regulating device includes an electronic expansion valve and a check valve connected in parallel, and an inlet of the check valve is communicated with the outdoor heat exchanger.

The technical scheme provided by the embodiment of the application can have the following beneficial effects: the heat pump system heats through the first loop under the heating mode, the third loop can absorb the heat of the second loop through the first heat exchanger to the heat that the battery pack in the coolant circulation loop produced is transferred to the refrigerant circulation loop, and therefore the heat pump system is not only favorable for the heat dissipation of the battery pack, but also can improve the heating capacity of the whole heat pump system and improve the energy efficiency.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic illustration of a heat pump system according to an exemplary embodiment of the present application;

FIG. 2 is a schematic illustration of a heating mode in a heat pump system according to an exemplary embodiment of the present application;

FIG. 3 is a schematic illustration of a heating mode in a heat pump system according to yet another exemplary embodiment of the present application;

FIG. 4 is a schematic diagram illustrating a cooling mode in a heat pump system according to an exemplary embodiment of the present application;

FIG. 5 is a schematic illustration of a cooling mode in a heat pump system according to yet another exemplary embodiment of the present application;

FIG. 6 is a schematic diagram illustrating a battery warm-up mode in a heat pump system according to an exemplary embodiment of the present application;

fig. 7 is a schematic diagram illustrating a battery charge cooling mode in a heat pump system according to an exemplary embodiment of the present application.

Detailed Description

The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

In the following, some embodiments of the present application will be described in detail with reference to the drawings, and features in the following examples and examples may be combined with each other without conflict.

The application provides a heat pump system which has multiple working modes such as a heating mode, a refrigerating mode, a battery preheating mode and a battery charging and cooling mode. The heat pump system in the embodiment of the application can be applied to automobiles, and is a device for refrigerating, heating, ventilating, purifying air and the like of air in a carriage.

As shown in fig. 1 to 3, the heat pump system of the present application includes a refrigerant circulation circuit and a coolant circulation circuit, the coolant circulation circuit including a battery pack 11, a first pump 15, a first heat exchanger 12 in communication with the battery pack 11, the first heat exchanger 12 being capable of being used in communication with the refrigerant circulation circuit. Wherein, heat pump system is including heating the mode, and when winter ambient temperature was lower, the heat pump system of this application can switch to heating the mode, under the heating mode:

the heat of the battery pack 11 is transferred to the refrigerant circulation circuit, and the heat of the battery pack 11 is recovered and utilized. Specifically, the refrigerant circulation circuit includes a compressor 21, a first indoor heat exchanger 22, an outdoor heat exchanger 23, a flow rate adjusting device 25, and a gas-liquid separator 26. The compressor 21, the first indoor heat exchanger 22, the flow regulating device 25, the outdoor heat exchanger 23 and the gas-liquid separator 26 are sequentially communicated to form a first loop, and the first loop is communicated to be used for heating the heat pump system. The battery 11, the first pump 15 and the first heat exchanger 12 are communicated and form a second loop, and optionally, the first pump 15 may also be disposed at an inlet of the battery 11. The first heat exchanger 12 and the flow rate adjusting device 25 are connected in parallel, the compressor 21, the first indoor heat exchanger 22, the first heat exchanger 12 and the gas-liquid separator 26 are sequentially communicated to form a third loop, and the third loop absorbs heat of the second loop through the first heat exchanger 12.

The heat generated by the battery pack 11 during operation is transferred to the first heat exchanger 12 through the second loop, and then the heat is transferred to the refrigerant circulation loop through the heat exchange between the first heat exchanger 12 and the third loop, so that the internal heat can be recovered, and the purpose of saving energy is achieved.

Further, the coolant circulation loop further comprises a motor set 13, a second heat exchanger 14 and a second pump 16, the heat pump system of the present application can also transfer heat of the motor set 13 in the automobile to the refrigerant circulation loop, and can further fully utilize heat generated by internal components during operation, so that heating efficiency of the refrigerant circulation loop can be improved, and energy efficiency of the refrigerant circulation loop can be improved. Specifically, the heat pump system is in a heating mode:

the motor group 13, the second pump 16 and the second heat exchanger 14 are communicated to form a fourth loop, and optionally, the second pump 16 may also be arranged at an inlet of the motor group 13. The second heat exchanger 14 is connected between the outlet of the outdoor heat exchanger 23 and the inlet of the gas-liquid separator 26, and the heat of the fourth loop is absorbed by the first loop through the second heat exchanger 14. The heat that motor group 13 during operation produced passes through the fourth return circuit and transmits to second heat exchanger 14, then carries out the heat exchange through second heat exchanger 14 and first return circuit and transmits the heat to refrigerant circulation circuit to can be with inside heat recovery, reach the purpose of energy saving.

In this embodiment, when the coolant in the coolant circulation loop is a mixed solution of water and ethanol, the first pump 15 and the second pump 16 are both water pumps, and the water pumps are respectively connected to water kettles in a matching manner. The first pump 15 and the second pump 16 are used to provide flow power for the coolant circulation circuit. Of course, the first pump 15 and the second pump 16 are not limited to the water pump in this application, and may have other pump body structures.

Furthermore, the coolant circuit comprises a bypass branch in parallel with the second heat exchanger 14. The bypass branch, the second pump 16 and the motor set 13 are communicated to form a fifth loop, so that when the coolant circularly flows, part of the coolant flows to the second heat exchanger 14, and the other part of the coolant flows back to the motor set 13 through the bypass branch, the highest-efficiency outward power output of the motor is realized by utilizing the temperature adjusting function of the bypass branch of the coolant, so that the heat required by ensuring the working environment is provided for the motor set 13 through the bypass branch, and the motor set 13 can reach the best working efficiency at the best proper temperature.

Specifically, the coolant circulation circuit further includes a third valve control 33, the third valve control 33 is connected between the second heat exchanger 14 and the motor group 13, and the third valve control 33 is a three-way valve. In the heating mode: the bypass branch is communicated with a second valve port of the third valve control 33, the motor group 13 is communicated with a first valve port of the third valve control 33, the second heat exchanger 14 is communicated with a third valve port of the third valve control 33, and the coolants of the fourth loop and the fifth loop flow into the battery group 13 after meeting at the third valve control 33. The third valve control is a proportional control valve, the flow of the bypass branch coolant can be adjusted, and the adjusting function of the working temperature of the motor is realized.

The coolant circulation loop further includes a radiator 18, and a branch where the radiator 18 is located, a branch where the second heat exchanger 14 is located, and a bypass branch are arranged in parallel with the motor group 13.

As shown in fig. 4, when the ambient temperature is high in summer, the heat pump system of the present application may be switched to the cooling mode: the second circuit is connected, the fourth circuit and the fifth circuit are disconnected, and the motor set 13, the second pump 16, the radiator 18 and the third valve control 33 are connected in sequence to form a sixth circuit.

As shown in fig. 5, when the ambient temperature in winter is low, in the heating mode of the heat pump system, frost is likely to form in the process of absorbing heat from the outdoor heat exchanger 23 to the external environment, and the heating of the heat pump system is affected in a long-term frosting state of the outdoor heat exchanger 23. Therefore, the heat pump system can be switched to the refrigeration mode, so that the problem that the outdoor heat exchanger 23 frosts when the heat pump system heats in winter is solved. When defrosting is performed in winter, the heat pump system switches the refrigeration mode, the heat pump system connects the second loop and the fifth loop, the fourth loop is disconnected, and the motor set 13, the second pump 16, the radiator 18 and the third valve control 33 are connected, that is, the sixth loop is connected.

Specifically, the coolant circulation circuit further includes: a first valve control 31, a second valve control 32 and a fourth valve control 34, the first valve control 31 being connected between the battery pack 11 and the first heat exchanger 12, the second valve control 32 being connected between the motor pack 13 and the second pump 16, the fourth valve control 34 being connected between the third valve control 33 and the second heat exchanger 14. In the embodiment of the present application, the first valve control 31, the second valve control 32, the third valve control 33, and the fourth valve control 34 are all three-way valves, and channels can be switched in different heat pump modes to control the communication state of the coolant circuit, so that not only the flow direction of the coolant can be changed, but also the flow rate of the coolant can be adjusted. Of course, in other embodiments, the valve may be implemented by a plurality of valve switches, and is not limited in particular.

As shown in fig. 4, when the ambient temperature is high in summer, the heat pump system is switched to the cooling mode:

the first valve port and the third valve port of the first valve control 31 are opened, the second valve port of the first valve control 31 is closed, the first valve port of the first valve control 31 is communicated with the inlet of the battery pack 11, and the third valve port of the first valve control 31 is communicated with the first heat exchanger 12.

The first and third ports of second valve control 32 are open, the third port of second valve control 32 is closed, the second port of second valve control 32 is in communication with the outlet of the electric motor set 13, and the first port of second valve control 32 is in communication with the inlet of the second pump 16.

The first valve port and the second valve port of the third valve control 33 are opened, the second valve port of the third valve control 33 is closed, the first valve port of the third valve control 33 is communicated with the inlet of the motor group 13, and the third valve port of the third valve control 33 is communicated with the first valve port of the fourth valve control 34.

The first and third ports of the fourth valve control 34 are open, the second port of the fourth valve control 34 is closed, and the third port of the fourth valve control 34 is in communication with the radiator 18.

The motor block 13, the second valve control 32, the second pump 16, the radiator 18, the fourth valve control 34, and the third valve control 33 are in communication in sequence to form a sixth circuit.

The working principle is as follows: in the cooling mode, the second loop and the sixth loop in the coolant circulation loop are two independent loops, the second loop where the battery pack 11 is located is switched to a loop for cooling the battery through the control of a valve, and the coolant circulation loop where the battery pack 11 is located carries the heat of the battery pack 11 to the first heat exchanger 12 by means of the first water pump 15, so that the coolant circulation loop absorbs the heat of the battery pack 11 at the position of the first heat exchanger 12. The coolant circulation loop in which the electric machine set 13 is located takes the heat of the electric machine set 13 to the radiator 18 by means of the second water pump 16, so that the radiator 18 radiates the heat to the outdoor environment.

As shown in fig. 5, when defrosting is needed in winter, the heat pump system is switched to the cooling mode:

The first and second ports of second valve control 32 are open, the third port of second valve control 32 is closed, the second port of second valve control 32 is in communication with the outlet of the electric motor group 13, and the first port of second valve control 32 is in communication with the inlet of second pump 16.

Three valve ports of the third valve control 33 are all opened, a second valve port of the third valve control 33 is communicated with the bypass branch, a first valve port of the third valve control 33 is communicated with an inlet of the motor group 13, and a third valve port of the third valve control 33 is communicated with a first valve port of the fourth valve control 34.

The motor block 13, the second valve control 32, the second pump 16, the radiator 18, the fourth valve control 34 and the third valve control 33 are in communication in sequence, i.e. in a sixth loop.

The working principle is as follows: when defrosting is performed in winter, the refrigerant circulation circuit is in a refrigeration mode, the compressor 21 compresses low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant releases heat to the external environment when passing through the outdoor heat exchanger 23, and at the moment, the frosted part of the outdoor heat exchanger 23 absorbs heat and melts, so that defrosting is achieved. In addition, the second loop where the battery pack 11 is located and the sixth loop where the motor group 13 is located are two independent loops, the second loop where the battery pack 11 is located is switched to a loop for cooling the battery through control of a valve, and the coolant circulation loop where the battery pack 11 is located takes heat of the battery pack 11 to the first heat exchanger 12 by means of the first water pump 15, so that the refrigerant circulation loop absorbs heat of the battery pack 11 at the position of the first heat exchanger 12. The sixth loop where the motor group 13 is located is switched to a loop where the motor group 13 radiates heat, the coolant circulation loop where the motor group 13 is located carries the heat of the motor group 13 to the radiator 18 by means of the second water pump 16, and the radiator 18 exchanges heat with the outside to release the heat to the outside. And a fifth loop in which the motor set 13 is located is simultaneously opened, the opening degree of the third valve control is proportionally adjusted, part of motor heat is controlled to flow back to the motor set 13 through the fifth loop, and the normal working temperature of the motor set 13 under the condition of low working condition in winter is controlled.

As shown in fig. 7, in the battery charge cooling mode:

the refrigerant circulation circuit, the second circuit, the fourth circuit, and the fifth circuit are all disconnected, specifically:

the first and second ports of the first valve control 31 are open, the third port of the first valve control 31 is closed, the first port of the first valve control 31 is communicated with the inlet of the battery pack 11, and the second port of the first valve control 31 is communicated with the first port of the third valve control 33.

The first and third ports of the second valve control 32 are open, the second port of the second valve control 32 is closed, the third port of the second valve control 32 is in communication with the outlet of the battery pack 11, and the first port of the second valve control 32 is in communication with the inlet of the second pump 16.

The first port and the third port of the third valve control 33 are opened, the second port of the third valve control 33 is closed, the first port of the third valve control 33 is communicated with the first valve control 31, and the third port of the third valve control 33 is communicated with the first port of the fourth valve control 34.

The first pump 15, the second valve control 32, the second pump 16, the radiator 18, the fourth valve control 34, the third valve control 33, the first valve control 31, and the battery pack 11 are communicated in sequence to form a seventh circuit.

The working principle is as follows: the heat pump system is in a battery charging cooling mode, the refrigerant circulation loop is in an inactive state, when the battery pack 11 is charged rapidly, the heat generated by the battery of the battery pack 11 is high, in order to avoid burning the battery due to overhigh temperature, the first pump 15 and the second pump 16 are used for bringing the heat to the radiator 18 through the coolant, so that the heat generated when the battery pack 11 is charged rapidly is transferred to the outdoor environment through the radiator 18.

As shown in fig. 6, the coolant circulation circuit further includes a heater 17, the heater 17 is connected in series with the second heat exchanger 14, and the heat pump system is in the battery warm-up mode:

the refrigerant circulation circuit, the second circuit, the fourth circuit, the fifth circuit, the sixth circuit, and the seventh circuit are all disconnected. Specifically, the method comprises the following steps:

The first and second ports of the fourth valve control 34 are open, the third port of the fourth valve control 34 is closed, and the second port of the fourth valve control 34 is in communication with the heater 17.

The first pump 15, the second valve control 32, the second pump 16, the second heat exchanger 14, the heater 17, the fourth valve control 34, the third valve control 33, the first valve control 31, and the battery pack 11 are communicated to form an eighth loop.

The working principle is as follows: in the heat pump system, in the battery preheating mode, the refrigerant circulation circuit is in an inoperative state, and in the mode, usually, in the case that the temperature of the working environment is low, the temperature of the battery pack 11 needs to be heated to a preset temperature, so that the large-current power supply of the battery pack 11 can be ensured, and the working efficiency of the battery pack 11 can be improved. Under this mode of operation, rely on heater 17 to generate heat and heat the coolant, under the drive of first water pump 15 and second water pump 16, the coolant of high temperature passes through eighth return circuit, with heat transfer to group battery 11 to with the heat transfer of heater 17 to group battery 11, thereby the realization preheats the battery.

In the present embodiment, the first heat exchanger 12 and the second heat exchanger 14 both use plate heat exchangers, but of course, the present invention is not limited to the plate heat exchangers, and other types of heat exchangers may also be applied to the present application. The heater 17 may be an electric heater, a PTC heater, or other type of heater, among others.

It should be noted that, in the embodiment of the present application, the sequential connection only illustrates a sequential relationship of connection between the respective devices, and other devices, such as a stop valve, may also be included between the respective devices.

The refrigerant circulation circuit of the present application includes a compressor 21, a first indoor heat exchanger 22, an outdoor heat exchanger 23, a fluid switching device 24, a flow rate adjusting device 25, and a gas-liquid separator 26. Wherein, the flow regulating device 25 comprises an electronic expansion valve 251 and a check valve 252 connected in parallel, and an inlet of the check valve 252 is communicated with the outdoor heat exchanger 23.

Further, the refrigerant circulation circuit further includes a second indoor heat exchanger 27 and a throttling element 28 connected to the second indoor heat exchanger 27. The first indoor heat exchanger 22 is a condenser, the second indoor heat exchanger 27 is an evaporator, and the throttle element 28 is preferably an electronic expansion valve.

In addition, the refrigerant circulation circuit further includes a throttling element 29 connected to the first heat exchanger 12, the throttling element 29 is used for controlling the amount of the refrigerant flowing through the first heat exchanger 12, and the throttling element 29 is preferably an electronic expansion valve. It should be noted that, in the embodiment of the present application, the sequential connection only illustrates a sequential relationship of connection between the respective devices, and other devices, such as a stop valve, may also be included between the respective devices.

In the present embodiment, as shown in fig. 2, the fluid switching device 24 includes a first port, a second port, a third port and a fourth port, and the heat pump system is in a heating mode: the first port is communicated with the fourth port, the second port is communicated with the third port, the first port is communicated with an outlet of the outdoor heat exchanger 23, the second port is communicated with an outlet of the first indoor heat exchanger 22, an inlet of the first indoor heat exchanger 22 is communicated with an outlet of the compressor 21, the third port is respectively communicated with inlets of the flow regulating device 25 and the gas-liquid separator 26, and the fourth port is communicated with an inlet of the gas-liquid separator 26;

wherein the first heat exchanger 12 is connected between the third port of the fluid switching device 24 and the gas-liquid separator 26, and the second heat exchanger 14 is connected between the fourth port of the fluid switching device 24 and the gas-liquid separator 26.

The third port is also communicated with an inlet of a second indoor heat exchanger 27, and the opening and closing of the third port are controlled by a throttling element 28, and the inlet of the second indoor heat exchanger 27 is also communicated with a flow regulating device 25.

In this embodiment, in the heating mode of the refrigerant cycle, the first port and the fourth port of the fluid switching device 24 are communicated, the second port and the third port of the fluid switching device 24 are communicated, the throttling element 28 connected to the second indoor heat exchanger 27 is disconnected, and the electronic expansion valve 251 of the flow rate adjusting device 25 is opened. The refrigerant in the refrigerant circulation loop sequentially passes through the compressor 21, the first indoor heat exchanger 22 and the fluid switching device 24, is divided into two paths after coming out from the third port of the fluid switching device 24, wherein one path flows to the gas-liquid separator 26 after passing through the first heat exchanger 12, and finally flows back to the compressor 21; the other path sequentially passes through the flow rate adjusting device 25, the outdoor heat exchanger 23, the fluid switching device 24 and the second heat exchanger 14, flows to the gas-liquid separator 26, and finally flows back to the compressor 21.

The working principle is as follows: in the heating mode, the compressor 21 consumes a certain amount of electric energy, compresses a low-pressure gaseous refrigerant into a high-pressure gaseous refrigerant, and then enters the first indoor heat exchanger 22, and the heat of the refrigerant is transferred to a low-temperature indoor air flow under the cooling of the indoor air flow, and is phase-changed and condensed into a liquid state. After flowing out of the first indoor heat exchanger 22, the liquid refrigerant is divided into two paths by the fluid switching device 24, and one path flows through the first heat exchanger 12 to absorb heat and then flows into the gas-liquid separator 26; the other path of the refrigerant flows through the flow rate adjusting device 25, at this time, the check valve of the flow rate adjusting device 25 is not opened, the liquid refrigerant flows from the electronic expansion valve 251 to the outdoor heat exchanger 23, the liquid refrigerant exchanges heat with low-temperature outdoor air flow in the outdoor heat exchanger 23, absorbs heat of the liquid refrigerant, evaporates to become low-temperature low-pressure gaseous refrigerant or gas-liquid two-phase refrigerant, then flows through the second heat exchanger 14 through the fluid switching device 24, absorbs heat in the coolant circulation loop, and flows to the gas-liquid separator 26. Finally, the liquid refrigerant is separated by the gas-liquid separator 26 and stored in the gas-liquid separator 26, and the low-temperature and low-pressure gaseous refrigerant flows into the compressor 21, thus performing the cycle operation. Under the mode of heating of this application heat pump system, through waste heat recovery to make outside thermal intervention, thereby can improve entire system heating capacity, improve the efficiency simultaneously.

In another embodiment of the present application, as shown in fig. 3, the fluid switching device 24 comprises a first port, a second port, a third port and a fourth port, the first port is communicated with the fourth port, the second port is communicated with the third port, the first port is communicated with the inlet of the gas-liquid separator 26, the second port is communicated with the outlet of the first indoor heat exchanger 22, the third port is communicated with the inlet of the flow regulator 25 and the inlet of the gas-liquid separator 26, respectively, and the fourth port is communicated with the outlet of the outdoor heat exchanger 23;

wherein the first heat exchanger 12 is connected between the third port of the fluid switching device 24 and the gas-liquid separator 26, and the second heat exchanger 14 is connected between the fourth port of the fluid switching device 24 and the outdoor heat exchanger 23.

In this embodiment, in the heating mode, the first port of the fluid switching device 24 communicates with the fourth port, the second port communicates with the third port, and the throttling element 28 connected to the second indoor heat exchanger 27 is disconnected. The refrigerant in the refrigerant circulation loop sequentially passes through the compressor 21, the first indoor heat exchanger 22 and the fluid switching device 24, is divided into two paths after coming out from the third port of the fluid switching device 24, wherein one path flows to the gas-liquid separator 26 after passing through the first heat exchanger 12, and finally flows back to the compressor 21; the other path sequentially passes through the flow rate adjusting device 25, the outdoor heat exchanger 23, the second heat exchanger 14 and the fluid switching device 24, then flows to the gas-liquid separator 26, and finally flows back to the compressor 21.

The working principle is as follows: in the heating mode, the compressor 21 consumes a certain amount of electric energy, compresses a low-pressure gaseous refrigerant into a high-pressure gaseous refrigerant, and then enters the first indoor heat exchanger 22, and the heat of the refrigerant is transferred to a low-temperature indoor air flow under the cooling of the indoor air flow, and is phase-changed and condensed into a liquid state. After flowing out of the first indoor heat exchanger 22, the liquid refrigerant is divided into two paths by the fluid switching device 24, and one path flows through the first heat exchanger 12 to absorb heat and then flows into the gas-liquid separator 26; the other path flows through the flow rate adjusting device 25, at this time, the check valve of the flow rate adjusting device 25 is not opened, the liquid refrigerant flows from the electronic expansion valve 251 to the outdoor heat exchanger 23, the liquid refrigerant exchanges heat with the low-temperature outdoor air flow in the outdoor heat exchanger 23, absorbs the heat of the liquid refrigerant, evaporates to become a low-temperature low-pressure gaseous refrigerant or a gas-liquid two-phase refrigerant, then flows through the second heat exchanger 14, absorbs the heat in the coolant circulation loop, and flows to the gas-liquid separator 26 through the fluid switching device 24. Finally, the liquid refrigerant is separated by the gas-liquid separator 26 and stored in the gas-liquid separator 26, and the low-temperature and low-pressure gaseous refrigerant flows into the compressor 21, thus performing the cycle operation. Under the mode of heating of this application heat pump system, through waste heat recovery to make outside thermal intervention, thereby can improve entire system heating capacity, improve the efficiency simultaneously.

As shown in fig. 5, when the ambient temperature in winter is low and the heat pump system is switched to the cooling mode and defrosting is performed, the first port and the second port of the fluid switching valve are communicated, the throttling element 28 is opened, and the second indoor heat exchanger 27 and the throttling element 28 are connected between the flow rate adjusting device 25 and the gas-liquid separator 26 and are arranged in parallel with the first heat exchanger 12. At this time, the electronic expansion valve 251 is closed, the check valve 252 is opened, and the refrigerant in the refrigerant circulation loop is divided into two paths after passing through the compressor 21, the first indoor heat exchanger 22, the fluid switching device 24, the outdoor heat exchanger 23, and the check valve 252 of the flow regulator 25 in sequence: one path flows to the gas-liquid separator 26 after passing through the second indoor heat exchanger 27, and the other path flows to the gas-liquid separator 26 after passing through the first heat exchanger 12, and finally flows back to the compressor 21.

As shown in fig. 4, when the ambient temperature in summer is high, the heat pump system is switched to the cooling mode, the first port and the second port of the fluid switching valve communicate with each other, the throttling element 28 is opened, and the second indoor heat exchanger 27 and the throttling element 28 are connected between the flow rate adjusting device 25 and the gas-liquid separator 26 and are arranged in parallel with the first heat exchanger 12. At this time, the electronic expansion valve 251 is closed, the check valve 252 is opened, and the refrigerant in the refrigerant circulation loop is divided into two paths after passing through the compressor 21, the first indoor heat exchanger 22, the fluid switching device 24, the outdoor heat exchanger 23, and the flow regulating device 25 in sequence: one path flows to the gas-liquid separator 26 after passing through the second indoor heat exchanger 27, and the other path flows to the gas-liquid separator 26 after passing through the first heat exchanger 12, and finally flows back to the compressor 21. Optionally, in the cooling mode, the sixth loop is disconnected, the fourth loop is communicated, the outlet of the check valve 252 is communicated with the third valve port of the fluid switching device 24, the fourth valve port of the fluid switching device 24 is communicated with the second heat exchanger 14, and the refrigerant in the refrigerant circulation loop is divided into three paths after passing through the flow rate adjusting device 25: the first path flows to a gas-liquid separator 26 after passing through a second indoor heat exchanger 27; the second flow flows to the gas-liquid separator 26 after passing through the first heat exchanger 12; the third path flows to the second heat exchanger 14 through the fluid switching device 24, and the refrigerants of the three paths are merged at the inlet of the gas-liquid separator 26. The coolant circulation loop in which the motor group 13 is located carries the heat of the motor group 13 to the second heat exchanger 14 by means of the second water pump 16, so that the coolant circulation loop absorbs the heat of the motor group 13 at the position of the second heat exchanger 14.

The cooling and heating pipelines of the battery pack 11 and the cooling pipeline of the motor set are fused with the pipeline of the refrigerant in the heat pump system, so that the whole system can run efficiently and reliably. Through utilizing the arrangement of refrigerant pipeline, heat exchanger and refrigerant circulation circuit intercommunication in the coolant circulation circuit make at least can be with the heat transfer to the refrigerant circulation circuit in the coolant circulation circuit under the heating mode, realize winter to the accurate recovery of battery, motor waste heat, not only be favorable to the heat dissipation of inside components and parts, can improve entire system heating capacity moreover, improve the efficiency simultaneously. The battery outputs electric energy outwards with optimal performance by utilizing the arrangement of the refrigerant pipeline; the maximum efficiency of the motor set is realized by utilizing the temperature adjusting function of a bypass branch of the coolant circulation loop; the pipeline arrangement of the coolant circulation loop is utilized, the implementation in winter is realized, and a large amount of heat generated by the quick charge of the battery pack is taken away by means of external cold energy.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A heat pump system, comprising: a refrigerant circulation circuit including a compressor (21), a first indoor heat exchanger (22), an outdoor heat exchanger (23), a flow rate adjusting device (25), and a gas-liquid separator (26); the coolant circulation circuit comprises a battery pack (11), a first pump (15) and a first heat exchanger (12);

the heat pump system comprises a heating mode, and in the heating mode:

the compressor (21), the first indoor heat exchanger (22), the flow regulating device (25), the outdoor heat exchanger (23), the gas-liquid separator (26) are communicated and form a first loop;

the battery pack (11), the first pump (15) and the first heat exchanger (12) are communicated and form a second loop;

the first heat exchanger (12) and the flow regulating device (25) are arranged in parallel, the compressor (21), the first indoor heat exchanger (22), the first heat exchanger (12) and the gas-liquid separator (26) are communicated and form a third loop, and the third loop absorbs heat of the second loop through the first heat exchanger (12);

the coolant circulation circuit further comprises an electric machine set (13), a second heat exchanger (14) and a second pump (16), the heat pump system being in a heating mode:

the motor group (13), the second pump (16) and the second heat exchanger (14) are communicated to form a fourth loop, the second heat exchanger (14) is connected between the outlet of the outdoor heat exchanger (23) and the inlet of the gas-liquid separator (26), and the first loop absorbs heat of the fourth loop through the second heat exchanger (14).

2. The heat pump system according to claim 1, wherein said coolant circulation circuit further comprises a bypass branch in parallel with said second heat exchanger (14), said heat pump system being in a heating mode: the motor set (13), the second pump (16) and the bypass branch are communicated to form a fifth loop.

3. The heat pump system of claim 2, wherein the coolant circulation loop further comprises: a third valve control (33), the third valve control (33) is connected between the second heat exchanger (14) and the motor set (13), the bypass branch is communicated with the third valve control (33), and the fourth loop and the fifth loop are intersected at the third valve control (33).

4. The heat pump system of claim 3, wherein the heat pump system includes a cooling mode in which the second circuit is on and the fourth circuit is off;

the coolant circulation circuit further comprises a radiator (18), the radiator (18) being connected in parallel with the second heat exchanger (14), the heat pump system being in a cooling mode: the motor block (13), the second pump (16), the radiator (18) and the third valve control (33) communicate to form a sixth circuit.

5. The heat pump system of claim 4, further comprising a battery charge cooling mode, wherein the coolant circulation loop further comprises: -a first valve control (31), a second valve control (32) and a fourth valve control (34), the first valve control (31) being connected between the battery pack (11) and the first heat exchanger (12), -the second valve control (32) being connected between the electric motor pack (13) and the second pump (16), -the fourth valve control (34) being connected between the third valve control (33) and the second heat exchanger (14);

in the cooling mode: the motor block (13), second valve control (32), the second pump (16), the radiator (18), fourth valve control (34) and the third valve control (33) are in communication to form a circuit;

in a battery charge cooling mode: the refrigerant circulation circuit, the second circuit, the fourth circuit and the fifth circuit are all disconnected, and the first pump (15), the second valve control (32), the second pump (16), the radiator (18), the fourth valve control (34), the third valve control (33), the first valve control (31) and the battery pack (11) are communicated to form a seventh circuit.

6. The heat pump system according to claim 5, further comprising a battery warm-up mode, wherein the coolant circulation circuit further comprises a heater (17), wherein the heater (17) is connected in series with the second heat exchanger (14), and wherein the heat pump system, in the battery warm-up mode:

the refrigerant circulation circuit, the second circuit, the fourth circuit, the fifth circuit, the sixth circuit and the seventh circuit are disconnected, and the first pump (15), the second valve control (32), the second pump (16), the second heat exchanger (14), the heater (17), the fourth valve control (34), the third valve control (33), the first valve control (31) and the battery pack (11) are communicated to form an eighth circuit.

7. The heat pump system according to claim 4, 5 or 6, wherein the refrigerant circulation circuit includes a fluid switching device (24), the fluid switching device (24) including a first port, a second port, a third port and a fourth port, the heat pump system being in a heating mode:

the first port is communicated with the fourth port, the second port is communicated with the third port, the first port is communicated with an outlet of the outdoor heat exchanger (23), the second port is communicated with an outlet of the first indoor heat exchanger (22), the third port is respectively communicated with inlets of the flow regulating device (25) and the gas-liquid separator (26), and the fourth port is communicated with an inlet of the gas-liquid separator (26);

wherein the first heat exchanger (12) is connected between the third port of the fluid switching device (24) and the gas-liquid separator (26), and the second heat exchanger (14) is connected between the fourth port of the fluid switching device (24) and the gas-liquid separator (26).

8. The heat pump system according to claim 4, 5 or 6, wherein the refrigerant circulation circuit includes a fluid switching device (24), the fluid switching device (24) including a first port, a second port, a third port and a fourth port, the heat pump system being in a heating mode:

the first port is communicated with the fourth port, the second port is communicated with the third port, the first port is communicated with an inlet of the gas-liquid separator (26), the second port is communicated with an outlet of the first indoor heat exchanger (22), the third port is communicated with inlets of the flow regulating device (25) and the gas-liquid separator (26), respectively, and the fourth port is communicated with an outlet of the outdoor heat exchanger (23);

wherein the first heat exchanger (12) is connected between the third port of the fluid switching device (24) and the gas-liquid separator (26), and the second heat exchanger (14) is connected between the fourth port of the fluid switching device (24) and the outdoor heat exchanger (23).

9. The heat pump system according to claim 7, wherein said refrigerant circulation circuit further comprises a second indoor heat exchanger (27) and a throttling element (28), said second indoor heat exchanger (27) and said first heat exchanger (12) being arranged in parallel, said first heat exchanger (12) being connected to an outlet of said flow regulating device (25), said throttling element (28) being connected to an inlet of said second indoor heat exchanger (27), said heat pump system being in a cooling mode:

the first port of the fluid switching device (24) communicates with the second port, and the compressor (21), the first indoor heat exchanger (22), the fluid switching device (24), the outdoor heat exchanger (23), the flow rate adjusting device (25), the throttling element (28), the second indoor heat exchanger (27), and the gas-liquid separator (26) communicate to form a loop.