Heat pump system and vehicle

Abstract

The utility model provides a kind of heat pump system and vehicle, it is related to vehicle technical field, heat pump system includes compressor, condenser, intermediate heat exchange collector, evaporator and throttling component, intermediate heat exchange collector is equipped with first refrigerant interface, second refrigerant interface, third refrigerant interface, fourth refrigerant interface, heat conduction passage and liquid storage cavity, first refrigerant interface and second refrigerant interface are communicated by heat conduction passage, third refrigerant interface and fourth refrigerant interface are communicated by liquid storage cavity, the medium pressure port of compressor is connected in third refrigerant interface, fourth refrigerant interface is connected in the refrigerant import end of evaporator;The refrigerant export end of condenser is connected in the refrigerant import end of evaporator, first refrigerant interface and second refrigerant interface are connected in condenser respectively;Or, first refrigerant interface and second refrigerant interface are connected in the refrigerant export end of condenser and the refrigerant import end of evaporator respectively. Like this, the production cost of heat pump system can be reduced, and the occupied space is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and more specifically, to a heat pump system and a vehicle. Background Technology

[0002] There are three main methods for recovering heat in electric vehicle heat pump systems: waste heat recovery heat pump technology, hot gas bypass heat pump technology, and gas injection enthalpy enhancement heat pump technology. Among these, gas injection enthalpy enhancement heat pump technology is the most commonly used method for recovering heat. Currently, traditional heat pump systems with gas injection enthalpy enhancement function use an additional economizer to recover heat from the compressor exhaust through heat exchange, but this increases the production cost and space required for the heat pump system. Utility Model Content

[0003] The problem this invention addresses is: how to improve the economic efficiency of a heat pump system with gas replenishment and enthalpy enhancement functions.

[0004] To address the aforementioned problems, this utility model provides a heat pump system and a vehicle.

[0005] In a first aspect, this utility model provides a heat pump system, including a compressor, a condenser, an intermediate heat exchange liquid collector, an evaporator, and a throttling component. The intermediate heat exchange liquid collector is provided with a first refrigerant interface, a second refrigerant interface, a third refrigerant interface, a fourth refrigerant interface, a heat conduction channel, and a liquid storage chamber. The first refrigerant interface and the second refrigerant interface are connected through the heat conduction channel, and the third refrigerant interface and the fourth refrigerant interface are connected through the liquid storage chamber. The exhaust port of the compressor is connected to the refrigerant inlet end of the condenser, the suction port of the compressor is connected to the refrigerant outlet end of the evaporator, the intermediate pressure port of the compressor is connected to the third refrigerant interface, and the fourth refrigerant interface is connected to the refrigerant inlet end of the evaporator. The throttling component is disposed on the pipeline between the evaporator and the intermediate heat exchange liquid collector.

[0006] When the condenser is a subcooled condenser, the refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator, and the first refrigerant interface and the second refrigerant interface are respectively connected to the condenser; or, when the condenser is a non-subcooled condenser, the first refrigerant interface and the second refrigerant interface are respectively connected to the refrigerant outlet of the condenser and the refrigerant inlet of the evaporator.

[0007] Optionally, when the condenser is a subcooled condenser, the condenser is provided with a first connection port and a second connection port. The first connection port is connected to the refrigerant inlet end of the condenser, and the second connection port is connected to the refrigerant outlet end of the condenser. The first refrigerant interface and the second refrigerant interface are respectively connected to the first connection port and the second connection port.

[0008] Optionally, the throttling assembly includes a first throttling valve and a second throttling valve. The refrigerant inlet of the evaporator is connected to the refrigerant outlet of the condenser or the second refrigerant interface through a first pipeline. The fourth refrigerant interface is connected to the first pipeline through a second pipeline. The first throttling valve is disposed on the first pipeline and located between the part of the second pipeline connected to the first pipeline and the refrigerant inlet of the evaporator. The second throttling valve is disposed on the second pipeline.

[0009] Optionally, the heat pump system further includes a switching valve, and the fourth refrigerant interface is also connected to the pipeline between the outlet end of the evaporator and the suction port of the compressor through a third pipeline. The switching valve is disposed on the third pipeline and is used to connect or disconnect the third pipeline.

[0010] Optionally, the end of the third pipeline located away from the compressor is connected to the second pipeline.

[0011] Optionally, the first throttle valve is a one-way throttle valve, and the second throttle valve is a two-way throttle valve.

[0012] Optionally, the first throttle valve and / or the second throttle valve are electronic expansion valves.

[0013] Optionally, the switching valve is a solenoid valve.

[0014] Optionally, the heat pump system further includes a pressure sensor, which is disposed on a pipe connected to the suction port of the compressor, and / or on a pipe connected to the discharge port of the compressor, and / or on a pipe connected to the intermediate pressure port of the compressor, and / or on the first pipe.

[0015] Secondly, this utility model provides a vehicle including the heat pump system described above.

[0016] The beneficial effects of this heat pump system are as follows: By setting an intermediate heat exchange collector in the heat pump system, which includes a first refrigerant interface, a second refrigerant interface, a third refrigerant interface, a fourth refrigerant interface, a heat conduction channel, and a liquid storage chamber, and connecting the first and second refrigerant interfaces through the heat conduction channel, and connecting the third and fourth refrigerant interfaces through the liquid storage chamber, the intermediate heat exchange collector can have both the heat exchange function of an economizer and the liquid storage function of a liquid storage tank. This allows the intermediate heat exchange collector, which has both heat exchange and liquid storage functions, to replace the economizer and liquid storage tank in the traditional heat pump system. This not only reduces production costs and improves the economy of the heat pump system, but also reduces the space occupied by the system, making it easier to arrange on the vehicle. Meanwhile, by connecting the compressor's exhaust port to the refrigerant inlet of the condenser, the compressor's suction port to the refrigerant outlet of the evaporator, and the refrigerant outlet of the condenser to the refrigerant inlet of the evaporator, and connecting the first and second refrigerant interfaces of the intermediate heat exchanger to the condenser respectively, or connecting the first and second refrigerant interfaces to the refrigerant outlet of the condenser and the refrigerant inlet of the evaporator respectively, the refrigerant flowing out of the compressor's exhaust port can exchange heat through the condenser and the intermediate heat exchanger, and after being throttled and depressurized by the throttling component, it enters the evaporator, and finally flows back into the compressor from the compressor's suction port, thus realizing the circulation of refrigerant in the heat pump system. Furthermore, by connecting the third refrigerant interface of the intermediate heat exchanger to the medium-pressure port of the compressor, and connecting the fourth refrigerant interface of the intermediate heat exchanger to the refrigerant inlet of the evaporator, the refrigerant flowing to the refrigerant inlet of the evaporator can be diverted to the fourth refrigerant interface, and then flow through the intermediate heat exchanger to the medium-pressure port of the compressor, thereby achieving the function of replenishing gas and increasing enthalpy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the heat pump system in the first embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the heat pump system in the second embodiment of the present invention when the switching valve is closed and the second throttle valve is forward-biased.

[0019] Figure 3 This is a schematic diagram of the heat pump system in the second embodiment of the present invention when the switching valve is open and the second throttle valve is forward-biased.

[0020] Figure 4 This is a schematic diagram of the heat pump system in the second embodiment of the present invention when the switching valve is open and the second throttle valve is reverse-biased.

[0021] Figure 5 This is a schematic diagram of the heat pump system in the third embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the heat pump system in the fourth embodiment of the present invention when the switching valve is closed and the second throttle valve is forward-biased.

[0023] Figure 7 This is a schematic diagram of the heat pump system in the fourth embodiment of the present invention when the switching valve is open and the second throttle valve is forward-biased.

[0024] Figure 8 This is a schematic diagram of the heat pump system in the fourth embodiment of the present invention when the switching valve is open and the second throttle valve is reverse-biased.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Compressor; 2. Condenser; 3. Intermediate heat exchanger; 4. Evaporator; 5. Throttling assembly; 51. First throttling valve; 52. Second throttling valve; 6. Switch valve; 7. First pipeline; 8. Second pipeline; 9. Third pipeline; 10. Pressure sensor;

[0027] a) First refrigerant interface; b) Second refrigerant interface; c) Third refrigerant interface; d) Fourth refrigerant interface. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0029] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0030] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0031] In related technologies, there are three main methods for recovering heat in electric vehicle heat pump systems: waste heat recovery heat pump technology, hot gas bypass heat pump technology, and gas injection enthalpy enhancement heat pump technology. Among these, gas injection enthalpy enhancement heat pump technology is the most commonly used method for recovering heat. Currently, traditional heat pump systems with gas injection enthalpy enhancement function use an additional economizer to recover heat from the compressor exhaust through heat exchange, but this increases the production cost and space required for the heat pump system.

[0032] The energy efficiency of a heat pump system refers to the ratio of the heat transferred from a low-temperature object to a high-temperature object to the required power consumption.

[0033] In view of the problems existing in the above-mentioned related technologies, this utility model provides a heat pump system and a vehicle.

[0034] Combination Figure 1 and Figure 5 As shown in the figure, a heat pump system provided by this utility model embodiment includes a compressor 1, a condenser 2, an intermediate heat exchange liquid collector 3, an evaporator 4, and a throttling component 5. The intermediate heat exchange liquid collector 3 is provided with a first refrigerant interface a, a second refrigerant interface b, a third refrigerant interface c, a fourth refrigerant interface d, a heat conduction channel, and a liquid storage chamber. The first refrigerant interface a and the second refrigerant interface b are connected through the heat conduction channel, and the third refrigerant interface c and the fourth refrigerant interface d are connected through the liquid storage chamber. The exhaust port of the compressor 1 is connected to the refrigerant inlet end of the condenser 2, the suction port of the compressor 1 is connected to the refrigerant outlet end of the evaporator 4, the intermediate pressure port of the compressor 1 is connected to the third refrigerant interface c, and the fourth refrigerant interface d is connected to the refrigerant inlet end of the evaporator 4. The throttling component 5 is disposed on the pipeline between the evaporator 4 and the intermediate heat exchange liquid collector 3.

[0035] When the condenser 2 is a subcooled condenser, the refrigerant outlet of the condenser 2 is connected to the refrigerant inlet of the evaporator 4, and the first refrigerant interface a and the second refrigerant interface b are respectively connected to the condenser 2; or, when the condenser 2 is a non-subcooled condenser, the first refrigerant interface a and the second refrigerant interface b are respectively connected to the refrigerant outlet of the condenser 2 and the refrigerant inlet of the evaporator 4.

[0036] Specifically, the outer surface of the intermediate heat exchanger 3 is provided with four interfaces: a first refrigerant interface a, a second refrigerant interface b, a third refrigerant interface c, and a fourth refrigerant interface d. The interior of the intermediate heat exchanger 3 is provided with a heat conduction channel and a liquid storage chamber that are not interconnected. The first refrigerant interface a and the second refrigerant interface b are connected through the heat conduction channel, allowing the refrigerant flowing into the intermediate heat exchanger 3 from the first refrigerant interface a to exchange heat via heat conduction, and then flowing out of the intermediate heat exchanger 3 from the second refrigerant interface b. Simultaneously, the third refrigerant interface c and the fourth refrigerant interface d are connected through the liquid storage chamber, allowing a portion of the refrigerant flowing into the intermediate heat exchanger 3 from the third refrigerant interface c to be stored in the liquid storage chamber, and the remaining portion to flow out of the intermediate heat exchanger 3 from the fourth refrigerant interface d. This gives the intermediate heat exchanger 3 the functions of both an economizer (heat exchanger) and a liquid storage device; in other words, the intermediate heat exchanger 3 can be an integrated structure of an economizer and a liquid storage device. Furthermore, the third refrigerant interface c is connected to the intermediate pressure port of compressor 1, and the fourth refrigerant interface d is connected to the refrigerant inlet of evaporator 4. This allows the refrigerant flowing to the refrigerant inlet of evaporator 4 to be diverted to the fourth refrigerant interface d, and then flows through the intermediate heat exchanger 3 to the intermediate pressure port of compressor 1 to achieve enthalpy enhancement through gas replenishment. The condenser 2 can be a conventional water-cooled condenser, and its water-side piping (i.e....) Figure 1 The green lines connecting to condenser 2 are not fully shown. Furthermore, condenser 2 can be either a subcooled condenser or a non-subcooled condenser. Evaporator 4 can be a conventional water-cooled evaporator, with its water-side piping (i.e.,...) Figure 1 (The blue lines connecting to the evaporator 4 are not fully shown.) The throttling assembly 5 is provided on the pipeline between the evaporator 4 and the intermediate heat exchanger 3, that is, on the pipeline through which the refrigerant flows out of the intermediate heat exchanger 3 and before flowing into the evaporator 4, for example, on the first pipeline 7 and / or the second pipeline 8 described later, so as to throttle and reduce the pressure before the refrigerant flows into the evaporator 4.

[0037] More specifically, when condenser 2 is a subcooled condenser, such as Figure 1As shown, the refrigerant outlet of condenser 2 is connected to the refrigerant inlet of evaporator 4. The first refrigerant inlet a and the second refrigerant inlet b of intermediate heat exchanger 3 are respectively connected to condenser 2. At this time, the refrigerant flowing out of the exhaust port of compressor 1 first flows into condenser 2 from the refrigerant inlet of condenser 2 for heat exchange, then flows out of condenser 2, and enters intermediate heat exchanger 3 from the first refrigerant inlet a. After heat exchange in intermediate heat exchanger 3 by heat conduction, it flows out of intermediate heat exchanger 3 from the second refrigerant inlet b, and re-enters condenser 2 for heat exchange. Then it flows out of condenser 2 from the refrigerant outlet, and after being throttled and depressurized by throttling component 5, it enters evaporator 4, and finally flows back into compressor 1 from the suction port of compressor 1, thus realizing the circulation of refrigerant in the heat pump system. When condenser 2 is a non-subcooled condenser, as shown... Figure 5 As shown, the first refrigerant interface a and the second refrigerant interface b of the intermediate heat exchanger 3 are connected to the refrigerant outlet end of the condenser 2 and the refrigerant inlet end of the evaporator 4, respectively. At this time, the refrigerant flowing out from the exhaust port of the compressor 1 flows into the condenser 2 from the refrigerant inlet end of the condenser 2 for heat exchange, then flows out from the refrigerant outlet end of the condenser 2, and enters the intermediate heat exchanger 3 from the first refrigerant interface a for heat exchange, then flows out from the intermediate heat exchanger 3 from the second refrigerant interface b, and after being throttled and depressurized by the throttling component 5, it enters the evaporator 4, and finally flows back into the compressor 1 from the suction port of the compressor 1, so as to realize the circulation of refrigerant in the heat pump system.

[0038] In the heat pump system of this embodiment, an intermediate heat exchange collector 3 can be provided in the heat pump system, which includes a first refrigerant interface a, a second refrigerant interface b, a third refrigerant interface c, a fourth refrigerant interface d, a heat conduction channel, and a liquid storage chamber. The first refrigerant interface a and the second refrigerant interface b are connected through the heat conduction channel, and the third refrigerant interface c and the fourth refrigerant interface d are connected through the liquid storage chamber. This allows the intermediate heat exchange collector 3 to have both the heat exchange function of an economizer and the liquid storage function of a liquid storage chamber. This allows the intermediate heat exchange collector 3, which has both heat exchange and liquid storage functions, to replace the economizer and liquid storage chamber in the traditional heat pump system. This not only reduces production costs and improves the economy of the heat pump system, but also reduces the space occupied by the system, making it easier to arrange on the vehicle. Meanwhile, by connecting the exhaust port of compressor 1 to the refrigerant inlet of condenser 2, connecting the suction port of compressor 1 to the refrigerant outlet of evaporator 4, connecting the refrigerant outlet of condenser 2 to the refrigerant inlet of evaporator 4, and connecting the first refrigerant interface a and the second refrigerant interface b of intermediate heat exchanger 3 to condenser 2 respectively, or connecting the first refrigerant interface a and the second refrigerant interface b to the refrigerant outlet of condenser 2 and the refrigerant inlet of evaporator 4 respectively, the refrigerant flowing out from the exhaust port of compressor 1 can exchange heat through condenser 2 and intermediate heat exchanger 3, and after being throttled and depressurized by throttling component 5, it enters evaporator 4, and finally flows back to compressor 1 from the suction port of compressor 1, so as to realize the circulation of refrigerant in the heat pump system. Furthermore, by connecting the third refrigerant interface c of the intermediate heat exchanger 3 to the medium-pressure port of the compressor 1, and connecting the fourth refrigerant interface d of the intermediate heat exchanger 3 to the refrigerant inlet of the evaporator 4, the refrigerant flowing to the refrigerant inlet of the evaporator 4 can be diverted to the fourth refrigerant interface d, and then flow through the intermediate heat exchanger 3 to the medium-pressure port of the compressor 1, thereby achieving the function of replenishing gas and increasing enthalpy.

[0039] Optionally, combined Figure 1 As shown, when the condenser 2 is a subcooled condenser, the condenser 2 is provided with a first connection port and a second connection port. The first connection port is connected to the refrigerant inlet end of the condenser 2, and the second connection port is connected to the refrigerant outlet end of the condenser 2. The first refrigerant interface a and the second refrigerant interface b are respectively connected to the first connection port and the second connection port.

[0040] In this optional embodiment, the condenser 2 is a subcooled condenser, which not only has an air inlet (i.e., the refrigerant inlet end of the condenser 2) and a liquid outlet (i.e., the refrigerant outlet end of the condenser 2), but also has a first connecting port and a second connecting port. By connecting the first connecting port of the condenser 2 to the refrigerant inlet end of the condenser 2, connecting the second connecting port of the condenser 2 to the refrigerant outlet end of the condenser 2, and connecting the first refrigerant interface a and the second refrigerant interface b of the intermediate heat exchange liquid collector 3 to the first connecting port and the second connecting port respectively, the connection between the intermediate heat exchange liquid collector 3 and the subcooled condenser is realized, thereby enabling the heat pump system to be applied to the subcooled condenser.

[0041] Optionally, combined Figure 1 and Figure 5 As shown, the throttling assembly 5 includes a first throttling valve 51 and a second throttling valve 52. The refrigerant inlet of the evaporator 4 is connected to the refrigerant outlet of the condenser 2 or the second refrigerant interface b through the first pipe 7. The fourth refrigerant interface d is connected to the first pipe 7 through the second pipe 8. The first throttling valve 51 is installed on the first pipe 7 and is located between the part of the second pipe 8 that connects to the first pipe 7 and the refrigerant inlet of the evaporator 4. The second throttling valve 52 is installed on the second pipe 8.

[0042] In this optional embodiment, such as Figure 1 As shown, when condenser 2 is a subcooled condenser, the refrigerant inlet of evaporator 4 is connected to the refrigerant outlet of condenser 2 via the first pipe 7, or, as... Figure 5 As shown, when the condenser 2 is a non-subcooled condenser, the refrigerant inlet of the evaporator 4 is connected to the second refrigerant port b of the intermediate heat exchanger 3 via the first pipe 7; simultaneously, the fourth refrigerant port d of the intermediate heat exchanger 3 is connected to the first pipe 7 via the second pipe 8. This achieves the pipe connection between the condenser 2, the intermediate heat exchanger 3, and the evaporator 4. Furthermore, by setting the first throttle valve 51 on the first pipe 7, located between the second pipe 8 (where it connects to the first pipe 7) and the refrigerant inlet of the evaporator 4, the refrigerant flowing into the evaporator 4 can be throttled and depressurized by the first throttle valve 51, facilitating evaporation within the evaporator 4. Moreover, by setting the second throttle valve 52 on the second pipe 8, the second throttle valve 52 can be a bidirectional throttle valve, allowing the refrigerant flowing into the intermediate heat exchanger 3 from the fourth refrigerant port d to be throttled and depressurized by the second throttle valve 52. The flow valve 52 throttles and reduces pressure to form a medium-pressure refrigerant flow back to the medium-pressure port of the compressor 1, thereby achieving gas replenishment and enthalpy increase. Alternatively, the refrigerant flowing out of the intermediate heat exchanger 3 from the fourth refrigerant port d can first be throttled and reduced in pressure by the second flow valve 52, and then flow into the first pipeline 7 and throttled and reduced in pressure by the first flow valve 51 before flowing into the evaporator 4. This further facilitates the evaporation of the refrigerant in the evaporator 4. At the same time, it can further regulate the pressure of the refrigerant entering the evaporator 4 to prevent the evaporator 4 from overheating or overcooling.

[0043] Optionally, combined Figures 2 to 4 , Figures 6 to 8 As shown, the heat pump system also includes a switching valve 6, and the fourth refrigerant interface d is also connected to the outlet end of the evaporator 4 and the suction port of the compressor 1 through the third pipe 9. The switching valve 6 is installed on the third pipe 9 and is used to connect or disconnect the third pipe 9.

[0044] Traditional hot gas bypass heat pump technology uses a bypass branch at the compressor discharge port. High-temperature refrigerant passes through the hot gas bypass valve and returns directly to the compressor suction port. When the hot gas bypass valve is open, some high-temperature, high-pressure gaseous refrigerant returns directly from the compressor discharge port to the compressor suction port. However, since this portion of refrigerant does not participate in the refrigeration cycle, energy is wasted, resulting in low energy efficiency of the heat pump system. Therefore, in this optional embodiment, the fourth refrigerant interface d of the intermediate heat exchanger 3 is connected to the outlet of the evaporator 4 and the suction port of the compressor 1 via a third pipe 9. A switching valve 6 is installed on the third pipe 9. Thus, when the switching valve 6 is closed, as... Figure 2 and Figure 6 As shown, the refrigerant flowing into the third pipe 9 is blocked and cannot flow to the suction port of the compressor 1. This causes the refrigerant flowing out of the condenser 2 or the intermediate heat exchanger 3 to split into two paths. One path flows directly to the evaporator 4 and back to the suction port of the compressor 1. The other path flows through the second pipe 8 to the fourth refrigerant interface d of the intermediate heat exchanger 3 and back to the intermediate pressure port of the compressor 1, thus forming a heat pump circuit with gas replenishment and enthalpy increase function. When the switch valve 6 is opened, as... Figure 3 and Figure 7 As shown, the third pipe 9 is opened, so that the refrigerant flowing out of the condenser 2 or the intermediate heat exchanger 3 can be divided into three paths. The first path of refrigerant flows directly to the evaporator 4 and flows back to the suction port of the compressor 1. The second path of refrigerant flows through the second pipe 8 to the fourth refrigerant interface d of the intermediate heat exchanger 3 and flows back to the medium pressure port of the compressor 1 to form a heat pump circuit with gas replenishment and enthalpy increase function. The third path of refrigerant flows through the third pipe 9 back to the suction port of the compressor 1 to form a heat pump circuit with hot gas bypass function, so that the heat pump system has both gas replenishment and enthalpy increase function and hot gas bypass function.

[0045] Optionally, combined Figure 3 and Figure 4 , Figure 7 and Figure 8 As shown, the first throttle valve 51 is a one-way throttle valve, and the second throttle valve 52 is a two-way throttle valve.

[0046] In this optional embodiment, by setting the first throttle valve 51 as a one-way throttle valve, it is prevented that the liquid refrigerant flows directly back to the compressor 1 without sufficient evaporation, causing liquid slugging and damage to the compressor 1. By setting the second throttle valve 52 as a two-way throttle valve, when the second throttle valve 52 is open in the forward direction, such as... Figure 3 and Figure 7 As shown, the refrigerant flows from the fourth refrigerant inlet d into the intermediate heat exchanger 3; when the second throttle valve 52 opens in reverse, as... Figure 4 and Figure 8 As shown, refrigerant can flow from the medium-pressure port of compressor 1 into the third refrigerant interface c of intermediate heat exchanger 3, and flow out of intermediate heat exchanger 3 from the fourth refrigerant interface d. When the switch valve 6 is open, the refrigerant flowing out of intermediate heat exchanger 3 can flow back to the suction port of compressor 1 through the third pipeline 9, so that the medium-pressure refrigerant can be replenished to the suction port of compressor 1, thereby shortening the compression stroke of hot gas bypass in compressor 1, reducing energy consumption, and thus improving the energy efficiency of heat pump system.

[0047] Optionally, the switching valve 6 is a solenoid valve. Since solenoid valves have advantages such as small size, timely response, easy control, and high reliability, they are used as the switching valve 6 to facilitate the rapid switching of the heat pump system between the two operating modes of hot gas bypass and gas replenishment enthalpy increase. At the same time, it can further reduce the space occupied by the heat pump system and facilitate its layout in the vehicle.

[0048] Optionally, the first throttle valve 51 and / or the second throttle valve 52 are electronic expansion valves. This configuration allows for precise regulation of the refrigerant flow using electronic expansion valves, thereby precisely controlling the superheat of the evaporator 4, improving the heat exchange efficiency of the evaporator 4, and ultimately increasing the energy efficiency ratio of the heat pump system.

[0049] Optionally, combined Figures 2 to 4 , Figures 6 to 8 As shown, the end of the third pipe 9 furthest from the compressor 1 is connected to the second pipe 8. Specifically, one end of the third pipe 9 is connected to the pipe between the outlet end of the evaporator 4 and the suction port of the compressor 1, and the other end is connected to the second pipe 8. This reduces the number of connecting pipes at the fourth refrigerant interface d, thereby improving the convenience of refrigerant piping layout.

[0050] Optionally, combined Figures 1 to 8 As shown, the heat pump system also includes a pressure sensor 10, which is disposed on a pipe connected to the suction port of the compressor 1, and / or on a pipe connected to the discharge port of the compressor 1, and / or on a pipe connected to the intermediate pressure port of the compressor 1, and / or on the first pipe 7.

[0051] In this optional embodiment, the pressure sensor 10 can be installed on the pipeline between the exhaust port of the compressor 1 and the refrigerant inlet of the condenser 2, on the pipeline between the intermediate pressure port of the compressor 1 and the third refrigerant interface c of the intermediate heat exchanger 3, on the pipeline between the suction port of the compressor 1 and the refrigerant outlet of the evaporator 4, or on the first pipeline 7. In this way, the pressure sensor 10 can be used to monitor the refrigerant pressure in the heat pump system in real time to ensure the safety of the heat pump system. Simultaneously, the collected pressure parameters can be used for auxiliary diagnosis and intelligent control.

[0052] This utility model provides a vehicle including the heat pump system described above.

[0053] The beneficial effects of the vehicle in this embodiment are the same as those of the heat pump system described above, and will not be repeated here.

[0054] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A heat pump system, characterized in that, The system includes a compressor (1), a condenser (2), an intermediate heat exchanger (3), an evaporator (4), and a throttling assembly (5). The intermediate heat exchanger (3) is provided with a first refrigerant interface (a), a second refrigerant interface (b), a third refrigerant interface (c), a fourth refrigerant interface (d), a heat conduction channel, and a liquid storage chamber. The first refrigerant interface (a) and the second refrigerant interface (b) are connected through the heat conduction channel. The third refrigerant interface (c) and the fourth refrigerant interface (d) are connected through the liquid storage chamber. The exhaust port of the compressor (1) is connected to the refrigerant inlet of the condenser (2). The suction port of the compressor (1) is connected to the refrigerant outlet of the evaporator (4). The medium pressure port of the compressor (1) is connected to the third refrigerant interface (c). The fourth refrigerant interface (d) is connected to the refrigerant inlet of the evaporator (4). The throttling assembly (5) is installed on the pipeline between the evaporator (4) and the intermediate heat exchanger (3). When the condenser (2) is a subcooled condenser, the refrigerant outlet of the condenser (2) is connected to the refrigerant inlet of the evaporator (4), and the first refrigerant interface (a) and the second refrigerant interface (b) are respectively connected to the condenser (2); or, when the condenser (2) is a non-subcooled condenser, the first refrigerant interface (a) and the second refrigerant interface (b) are respectively connected to the refrigerant outlet of the condenser (2) and the refrigerant inlet of the evaporator (4).

2. The heat pump system according to claim 1, characterized in that, When the condenser (2) is a subcooled condenser, the condenser (2) is provided with a first connection port and a second connection port. The first connection port is connected to the refrigerant inlet end of the condenser (2), and the second connection port is connected to the refrigerant outlet end of the condenser (2). The first refrigerant interface (a) and the second refrigerant interface (b) are respectively connected to the first connection port and the second connection port.

3. The heat pump system according to claim 1, characterized in that, The throttling assembly (5) includes a first throttling valve (51) and a second throttling valve (52). The refrigerant inlet of the evaporator (4) is connected to the refrigerant outlet of the condenser (2) or the second refrigerant interface (b) through a first pipe (7). The fourth refrigerant interface (d) is connected to the first pipe (7) through a second pipe (8). The first throttling valve (51) is installed on the first pipe (7) and located between the part of the second pipe (8) connected to the first pipe (7) and the refrigerant inlet of the evaporator (4). The second throttling valve (52) is installed on the second pipe (8).

4. The heat pump system according to claim 3, characterized in that, It also includes a switching valve (6), and the fourth refrigerant interface (d) is also connected to the outlet end of the evaporator (4) and the suction port of the compressor (1) through the third pipeline (9). The switching valve (6) is set on the third pipeline (9) and is used to connect or disconnect the third pipeline (9).

5. The heat pump system according to claim 4, characterized in that, The third pipeline (9) is connected to the second pipeline (8) at the end away from the compressor (1).

6. The heat pump system according to claim 4, characterized in that, The first throttle valve (51) is a one-way throttle valve, and the second throttle valve (52) is a two-way throttle valve.

7. The heat pump system according to claim 3, characterized in that, The first throttle valve (51) and / or the second throttle valve (52) are electronic expansion valves.

8. The heat pump system according to claim 4, characterized in that, The switching valve (6) is a solenoid valve.

9. The heat pump system according to claim 3, characterized in that, It also includes a pressure sensor (10), which is disposed on a pipe connected to the suction port of the compressor (1), and / or disposed on a pipe connected to the discharge port of the compressor (1), and / or disposed on a pipe connected to the medium pressure port of the compressor (1), and / or disposed on the first pipe (7).

10. A vehicle, characterized in that, Including the heat pump system as described in any one of claims 1-9.

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