Heat pump systems and heat pump system control methods

Abstract

This application relates to a heat pump system and a heat pump system control method. The heat pump system includes a heat exchange module and a power module. The power module includes a first switching unit and multiple compressors. The multiple compressors form a cycle with the heat exchange module through the first switching unit. The first switching unit is used to switch the connection relationship between the compressors, wherein the connection relationship is either parallel or series. By setting the first switching unit to design the series and parallel connection relationship between multiple compressors, the compressors in the heat pump system can adjust the series and parallel connection relationship as needed. For a single heat pump system, a higher outlet water temperature can be achieved when the compressors are connected in series, and a higher unit capacity can be achieved when the compressors are connected in parallel, meeting the application needs of different scenarios.

Description

Technical Field

[0001] This application relates to the field of heat pump units, and more particularly to a heat pump system and a heat pump system control method. Background Technology

[0002] Multiple compressors can be installed in a heat pump unit to improve its performance; when the compressors are connected in parallel, a smaller structure can achieve a higher unit capacity; when the compressors are connected in series, a higher outlet water temperature can be achieved; however, existing heat pump units have the connection relationship between the compressors set at the factory, which cannot simultaneously meet the user's needs for series and parallel connection of heat pump units. Summary of the Invention

[0003] This application provides a heat pump system and a heat pump system control method to solve the technical problem that the prior art cannot simultaneously meet the user's requirements for series and parallel connection of heat pump units.

[0004] In a first aspect, this application provides a heat pump system, the heat pump system including a heat exchange module and a power module, the power module including a first switching unit and a plurality of compressors, the plurality of compressors forming a cycle with the heat exchange module through the first switching unit; wherein:

[0005] The first switching unit is used to switch the connection relationship between the compressors, wherein the connection relationship is either parallel or series.

[0006] Optionally, the first switching unit includes a first four-way valve, and the compressor includes a first compressor and a second compressor, wherein:

[0007] The first end of the first four-way valve is connected to the input end of the second compressor, the output end of the second compressor is connected to the input end of the heat exchange module, the second end of the first four-way valve is connected to the output end of the first compressor, the input end of the first compressor is connected to the output end of the heat exchange module, the third end of the first four-way valve is connected to the input end of the heat exchange module, and the fourth end of the first four-way valve is connected to the output end of the heat exchange module.

[0008] In the first state, the first end of the first four-way valve is connected to the fourth end, the second end is connected to the third end, and the first compressor and the second compressor are connected in parallel.

[0009] In the second state, the first end of the first four-way valve is connected to the second end, and the third end is connected to the fourth end, and the first compressor and the second compressor are connected in series.

[0010] Optionally, the first switching unit further includes a first solenoid valve and a second solenoid valve; wherein:

[0011] The first solenoid valve is disposed between the fourth end of the first four-way valve and the output end of the heat exchange module, and the second solenoid valve is disposed between the third end of the four-way valve and the input end of the heat exchange module.

[0012] In the first state, the first solenoid valve and the second solenoid valve are connected; in the second state, the first solenoid valve and the second solenoid valve are closed.

[0013] Optionally, the first switching unit further includes a first check valve and a second check valve; wherein:

[0014] The first check valve is disposed between the output end of the first compressor and the second end of the first four-way valve, wherein the conduction direction of the first check valve is from the first compressor to the first four-way valve;

[0015] The second one-way valve is disposed between the output end of the second compressor and the input end of the heat exchange module, wherein the conduction direction of the second one-way valve is from the second compressor to the heat exchange module.

[0016] Optionally, the first switching unit further includes an oil separator and a third solenoid valve; wherein:

[0017] The oil separator is connected between the third end of the first four-way valve and the input end of the heat exchange module, and the oil outlet end of the oil separator is connected to the output end of the heat exchange module.

[0018] Optionally, the heat exchange module includes a gas-liquid separator, a second four-way valve, and a heat exchange unit; wherein:

[0019] The first end of the second four-way valve is connected to the first end of the heat exchange unit, the second end of the second four-way valve serves as the input end of the heat exchange module, the third end of the second four-way valve is connected to the second end of the heat exchange unit, the fourth end of the second four-way valve is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator serves as the output end of the heat exchange module; wherein:

[0020] In cooling mode, the first end of the second four-way valve is connected to the second end, and the third end is connected to the fourth end. The refrigerant is input from the first end of the heat exchange unit and output from the second end.

[0021] In heating mode, the third end of the second four-way valve is connected to the second end, and the first end is connected to the fourth end. The refrigerant is input from the second end of the heat exchange unit and output from the first end.

[0022] Optionally, the heat exchange unit includes a first heat exchanger, a first filter, a flow direction subunit, a drive cooling subunit, a second filter, and a second heat exchanger; the flow direction subunit includes a first flow direction subunit and a second flow direction subunit, wherein the limiting conduction directions of the first flow direction subunit and the second flow direction subunit are different; wherein:

[0023] The first end of the first heat exchanger serves as the first end of the heat exchange unit. The second end of the first heat exchanger is connected to the first end of the second heat exchanger via the first filter, the first flow direction subunit, the drive cooling subunit, the second flow direction subunit, and the second filter. The second end of the second heat exchanger serves as the second end of the heat exchange unit.

[0024] Wherein, the restricted conduction direction of the first flow direction subunit is from the first filter to the drive cooling subunit, and the restricted conduction direction of the second flow direction subunit is from the drive cooling subunit to the second filter.

[0025] Optionally, the compressor includes a first compressor and a second compressor. When the first compressor and the second compressor are connected in series, the first compressor is located near the input end of the power module, and the second compressor is located near the output end of the power module. The first compressor is a low-pressure stage compressor, and the second compressor is a high-pressure stage compressor.

[0026] The heat exchange unit further includes an economizer plate heat exchanger and a second electronic expansion valve; wherein:

[0027] The first end of the first heat exchange side of the economizer plate heat exchanger is connected to the second end of the first heat exchanger, and the second end of the first heat exchange side of the economizer plate heat exchanger is connected to the end of the first filter that passes through the first heat exchanger.

[0028] The second electronic expansion valve is connected between the second end of the first heat exchange side and the second end of the second heat exchange side of the economizer plate heat exchanger, and the first end of the second heat exchange side of the economizer plate heat exchanger is connected to the first compressor.

[0029] In a second aspect, this application also proposes a heat pump system control method, applied to the heat pump system described above; the heat pump system control method includes:

[0030] Determine the target connection relationship of the compressor;

[0031] After controlling the first switching unit to connect the compressor in series or in parallel through the target connection relationship, it is connected to the heat exchange module.

[0032] Optionally, the step of connecting the first switching unit to the heat exchange module after controlling the compressor to be connected in series or parallel through the target connection relationship includes:

[0033] If the target connection is in parallel, then the first four-way valve is controlled to the first state;

[0034] If the target connection is in series, then the first four-way valve is controlled to the second state.

[0035] This application proposes a heat pump system and a heat pump system control method. The heat pump system includes a heat exchange module and a power module. The power module includes a first switching unit and multiple compressors. The multiple compressors form a cycle with the heat exchange module through the first switching unit. The first switching unit is used to switch the connection relationship between the compressors, which can be parallel or series. By setting the first switching unit to design the series and parallel connection relationship between multiple compressors, the compressors in the heat pump system can adjust the series and parallel connection relationship as needed. For a single heat pump system, a higher outlet water temperature can be achieved when the compressors are connected in series, and a higher unit capacity can be achieved when the compressors are connected in parallel, meeting the application needs of different scenarios. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0039] Figure 1 This is a functional block diagram of an embodiment of the heat pump system of this application;

[0040] Figure 2 This is a schematic flowchart of an embodiment of the heat pump system control method of this application;

[0041] Figure 3 This is a schematic diagram of the structure of an embodiment of the heat pump system of this application;

[0042] Figure 4 This is a schematic diagram of the process for switching between series and parallel operation of the compressor in the heat pump system of this application;

[0043] Figure 5 This is a schematic diagram illustrating the process of switching between cooling and heating modes in the heat pump system of this application.

[0044] Figure 6 This is a diagram showing the refrigerant flow direction of the heat pump system in this application.

[0045] Explanation of icon numbers:

[0046]

[0047] Detailed Implementation

[0048] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0052] To address the technical problem that existing technologies cannot simultaneously meet users' demands for series and parallel operation of heat pump units, this application provides a heat pump system. By setting a first switching unit 210, the series and parallel operation relationship between multiple compressors is designed, thereby enabling the compressors in the heat pump system to adjust the series and parallel operation relationship as needed. For a single heat pump system, a higher outlet water temperature can be achieved when the compressors are connected in series, and a higher unit capacity can be achieved when the compressors are connected in parallel, thus meeting the application needs of different scenarios.

[0053] This application provides a heat pump system, see [link]. Figure 1 , Figure 1 This is a functional block diagram of an embodiment of the heat pump system of this application; in this embodiment, the heat pump system includes a heat exchange module 100 and a power module 200, the power module 200 includes a first switching unit 210 and a plurality of compressors 220, the plurality of compressors 220 forming a cycle with the heat exchange module 100 through the first switching unit 210; wherein:

[0054] The first switching unit 210 is used to switch the connection relationship between the compressors 220, wherein the connection relationship is either parallel or series.

[0055] The heat exchange module 100 includes devices that implement specific heat exchange functions in the heat pump system; the power module 200 includes devices that provide driving power for the refrigerant in the heat pump system; it can be understood that in the heat pump system, the device that provides driving power for the refrigerant is the compressor 220.

[0056] Multiple compressors 220 are connected in parallel or in series through the first switching unit 210;

[0057] When there are two compressors 220, the connection between the compressors 220 can be in series or in parallel. When the compressors 220 are in series, the two compressors 220 connected in series are called a circuit, and the two ends of the circuit are connected to the two ends of the heat exchange module 100 to form a loop. When the compressors 220 are in parallel, the two ends of the two compressors 220 are respectively connected to the two ends of the heat exchange module 100, and each compressor 220 can form a loop with the heat exchange module 100.

[0058] When the number of compressors 220 is greater than two, the connection relationship between the compressors 220 can be that all of them are connected in series, all of them are connected in parallel, or a combination of partial parallel and partial series connections. It can be understood that the compressors 220 connected in series to form a circuit and the heat exchange module 100 form a loop, and the compressors 220 connected in parallel and the heat exchange module 100 form a loop.

[0059] In subsequent embodiments, the example of two compressors 220 will be used for illustration. The case of more compressors 220 can be set up by analogy and will not be described again.

[0060] It is understood that the state of the first switching unit 210 in this embodiment can be switched. Specifically, the first state of the first switching unit 210 is to connect the compressors 220 in parallel, and the second state of the first switching unit 210 is to connect the compressors 220 in series. During the operation of the heat pump system, the series and parallel connection relationship between the compressors 220 can be adjusted by switching the state of the first switching unit 210.

[0061] This application also provides a heat pump system control method, applied to the heat pump system described above; see [link to application]. Figure 2 The heat pump system control method includes:

[0062] Step S10: Determine the target connection relationship of the compressor;

[0063] Step S20: Control the first switching unit to connect the compressor in series or in parallel through the target connection relationship, and then connect it to the heat exchange module.

[0064] The target connection relationship can be manually switched by the user, or the user can set switching conditions. When the heat pump system starts running or the switching conditions are met, the user can control the state of the first switching unit to switch the connection relationship between the compressors to the target connection relationship.

[0065] In practical applications, the state of the first switching unit 210 can be manually switched by the user, or it can be switched to the corresponding state when the heat pump system meets the switching conditions by setting switching conditions.

[0066] Further details will follow. Figure 3 The first switching unit 210 includes a first four-way valve F1, and the compressor 220 includes a first compressor C1 and a second compressor C2, wherein:

[0067] The first end of the first four-way valve F1 is connected to the input end of the second compressor C2, the output end of the second compressor C2 is connected to the input end of the heat exchange module 100, the second end of the first four-way valve F1 is connected to the output end of the first compressor C1, the input end of the first compressor C1 is connected to the output end of the heat exchange module 100, the third end of the first four-way valve F1 is connected to the input end of the heat exchange module 100, and the fourth end of the first four-way valve F1 is connected to the output end of the heat exchange module 100.

[0068] In the first state, the first end of the first four-way valve F1 is connected to the fourth end, the second end is connected to the third end, and the first compressor C1 and the second compressor C2 are connected in parallel.

[0069] In the second state, the first end of the first four-way valve F1 is connected to the second end, and the third end is connected to the fourth end. The first compressor C1 and the second compressor C2 are connected in series.

[0070] The first state indicates that the first compressor C1 and the second compressor C2 are connected in parallel, and the second state indicates that the first compressor C1 and the second compressor C2 are connected in series.

[0071] In the first state, i.e., the parallel state, the refrigerant is transmitted through two paths:

[0072] First path: The heat is transmitted from the output end of the heat exchange module 100 to the input end of the first compressor C1, and then from the output end of the first compressor C1 through the second and third ends of the first four-way valve F1 to the input end of the heat exchange module 100.

[0073] The second path: The heat exchange module 100 output terminal is transmitted sequentially through the fourth and first terminals of the first four-way valve F1 to the input terminal of the second compressor C2, and then from the output terminal of the second compressor C2 back to the input terminal of the heat exchange module 100.

[0074] In the second state, i.e., the series state, the refrigerant is transmitted through one path:

[0075] The refrigerant is transferred from the output end of the heat exchange module 100 to the input end of the first compressor C1. Then, it is transferred from the output end of the first compressor C1 to the input end of the second compressor C2 through the second end and the first end of the first four-way valve F1. Finally, it is transferred from the output end of the second compressor C2 to the input end of the heat exchange module 100.

[0076] In the heat pump system control method, step S20 includes:

[0077] If the target connection is in parallel, then the first four-way valve is controlled to the first state;

[0078] If the target connection is in series, then the first four-way valve is controlled to the second state.

[0079] The target connection relationship is set at startup, or the target state of the first four-way valve F1 is switched during application. When a state switch is required, the state switch is achieved by controlling the power-on and power-off of the first four-way valve F1. See [link to relevant documentation]. Figure 4 :

[0080] In this embodiment, when the first four-way valve F1 is de-energized, the first end is connected to the second end, and the third end is connected to the fourth end.

[0081] When the first four-way valve F1 is energized, the first end is connected to the fourth end, and the second end is connected to the third end.

[0082] When the system starts up, it determines whether to activate the series mode based on the real-time determined target connection relationship. If the series mode needs to be activated, the first four-way valve F1 is de-energized, and the first end is connected to the second end, and the third end is connected to the fourth end; the first compressor C1 and the second compressor C2 are switched to a series state. If the series mode does not need to be activated, the first four-way valve F1 is energized, and the first end is connected to the fourth end, and the second end is connected to the third end; the first compressor C1 and the second compressor C2 are switched to a parallel state.

[0083] In series mode, the system determines whether to exit series mode based on the target connection relationship determined in real time. When exiting series mode, the first four-way valve F1 is energized, the first end is connected to the fourth end, and the second end is connected to the third end; the first compressor C1 and the second compressor C2 are switched to parallel mode; when exiting series mode is not required, the first four-way valve F1 is de-energized.

[0084] In other embodiments, other devices can be used to replace the first four-way valve F1, such as setting multiple electronic expansion valves to replace the switching state between any two ends of the first four-way valve F1. Then, the series-parallel switching of the compressor 220 can be realized based on the switching control of each electronic expansion valve.

[0085] Furthermore, the first compressor C1 is a low-pressure stage compressor, and the second compressor C2 is a high-pressure stage compressor.

[0086] In the series configuration, the input terminal of the first compressor C1 is connected to the output terminal of the heat exchange module 100, and the output terminal of the second compressor C2 is connected to the input terminal of the heat exchange module 100. That is, the first compressor C1 processes the refrigerant first, and then the second compressor C2 processes the refrigerant. In this embodiment, the first compressor C1 is set as a low-pressure stage compressor to initially pressurize the refrigerant, and the second compressor C2, a high-pressure stage compressor, further pressurizes the refrigerant, thus realizing the setting of the refrigerant pressurization stage.

[0087] Furthermore, the first switching unit 210 further includes a first solenoid valve E1 and a second solenoid valve E2; wherein:

[0088] The first solenoid valve E1 is disposed between the fourth end of the first four-way valve F1 and the output end of the heat exchange module 100, and the second solenoid valve E2 is disposed between the third end of the four-way valve and the input end of the heat exchange module 100.

[0089] In the first state, the first solenoid valve E1 and the second solenoid valve E2 are connected; in the second state, the first solenoid valve E1 and the second solenoid valve E2 are closed.

[0090] In the first state, the pipes containing the first solenoid valve E1 and the second solenoid valve E2 need to carry out the task of refrigerant transmission. Specifically, the refrigerant output from the first compressor C1 is transmitted to the input end of the heat exchange module 100 through the pipe containing the second solenoid valve E2; the refrigerant output from the heat exchange module 100 is transmitted to the fourth end of the first four-way valve F1 through the pipe containing the first solenoid valve E1. Therefore, in the first state, the first solenoid valve E1 and the second solenoid valve E2 need to be set to be open.

[0091] In the second state, the pipes containing the first solenoid valve E1 and the second solenoid valve E2 do not need to carry out the task of refrigerant transmission. At the same time, the pipes containing the first solenoid valve E1 and the second solenoid valve E2 are connected due to the action of the first four-way valve F1. At this time, the output and input ends of the heat exchange module 100 are connected through the pipes containing the first solenoid valve E1 and the second solenoid valve E2. If the first solenoid valve E1 and the second solenoid valve E2 are connected, the high-pressure refrigerant output by the second compressor C2 may be diverted to the input end of the heat exchange module 100 through the pipes containing the first solenoid valve E1 and the second solenoid valve E2. Therefore, in order to avoid this problem, in the second state, the first solenoid valve E1 and the second solenoid valve E2 need to be set to closed.

[0092] Furthermore, the first switching unit 210 further includes a first check valve S1 and a second check valve S2; wherein:

[0093] The first one-way valve S1 is disposed between the output end of the first compressor C1 and the second end of the first four-way valve F1, wherein the conduction direction of the first one-way valve S1 is from the first compressor C1 to the first four-way valve F1;

[0094] The second one-way valve S2 is disposed between the output end of the second compressor C2 and the input end of the heat exchange module 100, wherein the conduction direction of the second one-way valve S2 is from the second compressor C2 to the heat exchange module 100.

[0095] In the first state, i.e. the parallel state, the output end of the first compressor C1 and the output end of the second compressor C2 are short-circuited through the first four-way valve F1. Since the refrigerant pressures output by the first compressor C1 and the second compressor C2 are different, in order to avoid backflow of refrigerant between different pressures, the first one-way valve S1 and the second one-way valve S2 are set so that the output ends of the first compressor C1 and the second compressor C2 only output refrigerant and do not backflow refrigerant.

[0096] Furthermore, the first switching unit 210 also includes an oil separator I1 and a third solenoid valve E3; wherein:

[0097] The oil separator I1 is connected between the third end of the first four-way valve F1 and the input end of the heat exchange module 100, and the oil outlet end of the oil separator I1 is connected to the output end of the heat exchange module 100.

[0098] Oil separator I1 is used to separate refrigerant and lubricating oil in the pipeline. It is understood that the compressor contains lubricating oil in its cylinder during operation, and some of this lubricating oil is output along with the refrigerant. If the lubricating oil enters the heat exchange module 100 along with the refrigerant, it will thicken at the low temperature of the evaporator and remain there, affecting the heat exchange performance of the evaporator. Simultaneously, it leads to a lack of lubricating oil in the compressor. Therefore, in this embodiment, oil separator I1 is used to separate the refrigerant and lubricating oil, ensuring that the refrigerant output to the heat exchange module 100 does not contain lubricating oil, thus avoiding any impact on heat exchange performance. Simultaneously, the separated lubricating oil is output to the output end of the heat exchange module 100 via a third electronic valve, and this lubricating oil returns to the compressor along with the refrigerant, preventing a lack of oil in the compressor. The third solenoid valve E3 is used to control the on / off state of the pipeline.

[0099] Furthermore, the heat exchange module 100 includes a gas-liquid separator G1, a second four-way valve F2, and a heat exchange unit 110; wherein:

[0100] The first end of the second four-way valve F2 is connected to the first end of the heat exchange unit 110, the second end of the second four-way valve F2 serves as the input end of the heat exchange module 100, the third end of the second four-way valve F2 is connected to the second end of the heat exchange unit 110, the fourth end of the second four-way valve F2 is connected to the input end of the gas-liquid separator G1, and the output end of the gas-liquid separator G1 serves as the output end of the heat exchange module 100; wherein:

[0101] In cooling mode, the first end of the second four-way valve F2 is connected to the second end, and the third end is connected to the fourth end. The refrigerant is input from the first end of the heat exchange unit 110 and output from the second end.

[0102] In heating mode, the third end of the second four-way valve F2 is connected to the second end, and the first end is connected to the fourth end. The refrigerant is input from the second end of the heat exchange unit 110 and output from the first end.

[0103] The gas-liquid separator G1 is used to separate the gaseous refrigerant from the liquid refrigerant and output the gaseous refrigerant to the power module 200.

[0104] The flow direction of the refrigerant in the heat exchange unit 110 can be changed by controlling the state of the second four-way valve F2, thereby realizing the switching between cooling mode and heating mode.

[0105] In cooling mode, the refrigerant input at the second end of the second four-way valve F2 is output to the heat exchange unit 110 through the first end of the second four-way valve F2. The refrigerant output from the heat exchange unit 110 is sequentially transmitted to the input end of the gas-liquid separator G1 through the fourth and third ends of the second four-way valve F2. The refrigerant is then transmitted to the power module 200 through the output end of the gas-liquid separator G1.

[0106] In heating mode, the refrigerant input at the second end of the second four-way valve F2 is output to the heat exchange unit 110 through the third end of the second four-way valve F2. The refrigerant output from the heat exchange unit 110 is sequentially transmitted to the input end of the gas-liquid separator G1 through the first and third ends of the second four-way valve F2. The refrigerant is then transmitted to the power module 200 through the output end of the gas-liquid separator G1.

[0107] The control methods for heat pump systems also include:

[0108] Determine the current target pattern;

[0109] If the target mode is cooling mode, then the second four-way valve is de-energized;

[0110] If the target mode is heating mode, then the second Stone valve is energized.

[0111] In this embodiment, when the second four-way valve F2 is de-energized, the first and second terminals are connected, and the third and fourth terminals are connected; when the second four-way valve F2 is energized, the first and third terminals are connected, and the second and fourth terminals are connected. The target state of the second four-way valve can be set at startup or switched during application. When mode switching is required, the state is switched by controlling the energization and de-energization of the second four-way valve. See [link to relevant documentation]. Figure 5 :

[0112] Determine if the target mode is cooling mode. If it is cooling mode, when the second four-way valve F2 is de-energized, the first and second terminals are connected, and the third and fourth terminals are connected. At this time, the system is in cooling mode. If it is not cooling mode, when the second four-way valve F2 is energized, the first and third terminals are connected, and the second and fourth terminals are connected. At this time, the system is in heating mode.

[0113] When the system is in cooling mode, determine whether to switch to heating mode. If it is switched to heating mode, when the second four-way valve F2 is energized, the first and third terminals are connected, and the second and fourth terminals are connected. At this time, the system is in heating mode.

[0114] Further, the heat exchange unit 110 includes a first heat exchanger T1, a first filter R1, a flow direction subunit 111, a drive cooling subunit, a second filter R2, and a second heat exchanger T2; the flow direction subunit 111 includes a first flow direction subunit 1111 and a second flow direction subunit 1112, wherein the limiting conduction directions of the first flow direction subunit 1111 and the second flow direction subunit 1112 are different; wherein:

[0115] The first end of the first heat exchanger T1 serves as the first end of the heat exchange unit 110. The second end of the first heat exchanger T1 is connected to the first end of the second heat exchanger T2 via the first filter R1, the first flow direction subunit 1111, the drive cooling subunit, the second flow direction subunit 1112, and the second filter R2. The second end of the second heat exchanger T2 serves as the second end of the heat exchange unit 110.

[0116] Wherein, the restricted conduction direction of the first flow direction subunit 1111 is from the first filter R1 to the drive cooling subunit, and the restricted conduction direction of the second flow direction subunit 1112 is from the drive cooling subunit to the second filter R2.

[0117] The specific types or structures of the first heat exchanger T1 and the second heat exchanger T2 can be set based on the actual application scenario; in this embodiment, the first heat exchanger T1 includes a finned heat exchanger and a fan; the second heat exchanger T2 is a plate heat exchanger.

[0118] The drive cooling subunit is used to cool the IPM (Intelligent Power Module).

[0119] Filters are used to absorb moisture from pipes and remove impurities.

[0120] In cooling mode, the refrigerant input at the first end of the second four-way valve F2 is transferred to the first heat exchanger T1 for heat exchange. At this time, the first heat exchanger T1 acts as a condenser. After the refrigerant releases heat, it passes through the first filter R1, the first flow direction subunit 1111, the drive cooling subunit, the second flow direction subunit 1112, and the second filter R2 in sequence to reach the second heat exchanger T2. The refrigerant exchanges heat in the second heat exchanger T2. At this time, the second heat exchanger T2 acts as an evaporator. After the refrigerant absorbs heat, it is output to the gas-liquid separator G1 through the fourth and third ends of the second four-way valve F2.

[0121] In heating mode, the refrigerant input at the first end of the second four-way valve F2 is transferred to the second heat exchanger T2 for heat exchange. At this time, the second heat exchanger T2 acts as a condenser. After the refrigerant releases heat, it passes through the second filter R2, the second flow direction subunit 1112, the drive cooling subunit, the first flow direction subunit 1111, and the first filter R1 in sequence to reach the first heat exchanger T1. The refrigerant exchanges heat in the first heat exchanger T1. At this time, the first heat exchanger T1 acts as an evaporator. After the refrigerant absorbs heat, it is output to the gas-liquid separator G1 through the first and third ends of the second four-way valve F2.

[0122] Furthermore, the flow direction subunit 111 includes a third one-way valve S3 and a first electronic expansion valve V1, wherein:

[0123] The third one-way valve S3 is connected in parallel with the first electronic expansion valve V1, and the conduction direction of the third one-way valve S3 is the restricted conduction direction of the flow subunit 111.

[0124] The third one-way valve S3 and the first electronic expansion valve V1 control the direction of refrigerant flow;

[0125] In cooling mode, refrigerant flows from the first heat exchanger T1 to the second heat exchanger T2. At this time, the third check valve S3 in the first flow subunit 1111 is open and the first electronic expansion valve V1 is closed. The third check valve S3 in the second flow subunit 1112 is closed and the first electronic expansion valve V1 is open. The refrigerant output from the first heat exchanger T1 flows to the second heat exchanger T2 through the third check valve S3 in the first flow subunit 1111 and the first electronic expansion valve V1 in the second flow subunit 1112.

[0126] In heating mode, refrigerant flows from the second heat exchanger T2 to the first heat exchanger T1. At this time, the third check valve S3 in the first flow subunit 1111 is closed and the first electronic expansion valve V1 is open. The third check valve S3 in the second flow subunit 1112 is open and the first electronic expansion valve V1 is closed. The refrigerant output from the second heat exchanger T2 flows to the first heat exchanger T1 through the first electronic expansion valve V1 in the second flow subunit 1112 and the third check valve S3 in the first flow subunit 1111.

[0127] Furthermore, the compressor 220 includes a first compressor C1 and a second compressor C2. When the first compressor C1 and the second compressor C2 are connected in series, the first compressor C1 is close to the input end of the power module 200, and the second compressor C2 is close to the output end of the power module 200. The first compressor C1 is a low-pressure stage compressor, and the second compressor C2 is a high-pressure stage compressor.

[0128] The heat exchange unit 110 further includes an economizer plate heat exchanger T3 and a second electronic expansion valve V2; wherein:

[0129] The first end of the first heat exchange side of the economizer plate heat exchanger T3 is connected to the second end of the first heat exchanger T1, and the second end of the first heat exchange side of the economizer plate heat exchanger T3 is connected to the first filter R1 near one end of the first heat exchanger T1.

[0130] The second electronic expansion valve V2 is connected between the second end of the first heat exchange side and the second end of the second heat exchange side of the economizer plate heat exchanger T3, and the first end of the second heat exchange side of the economizer plate heat exchanger T3 is connected to the first compressor C1.

[0131] When the first compressor C1 and the second compressor C2 are connected in series, the exhaust temperature of the low-pressure stage compressor needs to be reduced before it is output to the high-pressure stage compressor. Therefore, in this embodiment, the low-temperature refrigerant output from the back end of the first heat exchanger T1 is used to cool the low-pressure stage compressor.

[0132] In cooling mode, the first heat exchanger T1 acts as a condenser. The refrigerant releases heat through the first heat exchanger T1 to obtain low-temperature refrigerant. The low-temperature refrigerant flows through the economizer plate heat exchanger T3 for heat exchange, cooling the second heat exchange side of the economizer plate heat exchanger T3. The refrigerant on the second heat exchange side of the economizer plate heat exchanger T3 evaporates from high-temperature saturated liquid refrigerant into low-temperature medium-pressure gaseous refrigerant. The low-temperature medium-pressure gaseous refrigerant cools the exhaust temperature of the low-pressure stage compressor.

[0133] The following reference Figure 6 The overall implementation principle of the heat pump system in this application is explained as follows:

[0134] First, the control state of the device will be explained:

[0135] When the first four-way valve F1 is de-energized, the first end is connected to the second end, and the third end is connected to the fourth end.

[0136] When the first four-way valve F1 is energized, the first end is connected to the fourth end, and the second end is connected to the third end.

[0137] When the second four-way valve F2 is de-energized, the first end is connected to the second end, and the third end is connected to the fourth end.

[0138] When the second four-way valve F2 is energized, the first end is connected to the third end, and the second end is connected to the fourth end.

[0139] I. In cooling mode:

[0140] 1. The first compressor C1 and the second compressor C2 are connected in parallel. The first four-way valve F1 is energized, and the second four-way valve F2 is de-energized; the refrigerant is transferred through two paths:

[0141] First refrigerant flow path: First compressor C1 - First one-way valve S1 - Second end of first four-way valve F1 - Third end of first four-way valve F1 - First solenoid valve E1 - Oil separator I1 - Second end of second four-way valve F2 - First end of second four-way valve F2 - First heat exchanger T1 - First filter R1 - Third one-way valve S3 of first flow subunit 1111 - Drive cooling subunit - First electronic expansion valve V1 of second flow subunit 1112 - Second filter R2 - Second heat exchanger T2 - Fourth end of second four-way valve F2 - Third end of second four-way valve F2 - Gas-liquid separator G1 - First compressor C1;

[0142] Second refrigerant flow path: Second solenoid valve E2 - Fourth end of first four-way valve F1 - First end of first four-way valve F1 - Second compressor C2 - Second check valve S2 - Oil separator I1 - Second end of second four-way valve F2 - First end of second four-way valve F2 - First heat exchanger T1 - First filter R1 - Third check valve S3 of first flow subunit 1111 - Drive cooling subunit - First electronic expansion valve V1 of second flow subunit 1112 - Second filter R2 - Second heat exchanger T2 - Fourth end of second four-way valve F2 - Third end of second four-way valve F2 - Gas-liquid separator G1 - Second solenoid valve E2;

[0143] 2. The first compressor C1 and the second compressor C2 are connected in parallel. The first four-way valve F1 is de-energized, the second four-way valve F2 is de-energized, and the refrigerant is transferred through one channel:

[0144] Refrigerant flow direction: First compressor C1 - First one-way valve S1 - Second end of first four-way valve F1 - First end of first four-way valve F1 - Second compressor C2 - Second one-way valve S2 - Oil separator I1 - Second end of second four-way valve F2 - First end of second four-way valve F2 - First heat exchanger T1 - First filter R1 - Third one-way valve S3 of first flow subunit 1111 - Drive cooling subunit - First electronic expansion valve V1 of second flow subunit 1112 - Second filter R2 - Second heat exchanger T2 - Fourth end of second four-way valve F2 - Third end of second four-way valve F2 - Gas-liquid separator G1 - First compressor C1;

[0145] II. Heating Mode:

[0146] 1. The first compressor C1 and the second compressor C2 are connected in parallel. The first four-way valve F1 is energized, and the second four-way valve F2 is energized; the refrigerant is transferred through two paths:

[0147] First refrigerant flow path: First compressor C1 - First one-way valve S1 - Second end of first four-way valve F1 - Third end of first four-way valve F1 - First solenoid valve E1 - Oil separator I1 - Second end of second four-way valve F2 - Fourth end of second four-way valve F2 - Second heat exchanger T2 - Second filter R2 - Third one-way valve S3 of second flow subunit 1112 - Drive cooling subunit - First electronic expansion valve V1 of first flow subunit 1111 - First filter R1 - First heat exchanger T1 - First end of second four-way valve F2 - Third end of second four-way valve F2 - Gas-liquid separator G1 - First compressor C1;

[0148] Second refrigerant flow path: Second solenoid valve E2 - Fourth end of first four-way valve F1 - First end of first four-way valve F1 - Second compressor C2 - Second check valve S2 - Oil separator I1 - Second end of second four-way valve F2 - Fourth end of second four-way valve F2 - Second heat exchanger T2 - Second filter R2 - Third check valve S3 of second flow subunit 1112 - Drive cooling subunit - First electronic expansion valve V1 of first flow subunit 1111 - First filter R1 - First heat exchanger T1 - First end of second four-way valve F2 - Third end of second four-way valve F2 - Gas-liquid separator G1 - Second solenoid valve E2;

[0149] 2. The first compressor C1 and the second compressor C2 are connected in parallel. The first four-way valve F1 is de-energized, and the second four-way valve F2 is energized. The refrigerant is transferred through one channel:

[0150] Refrigerant flow direction: First compressor C1 - First one-way valve S1 - Second end of first four-way valve F1 - First end of first four-way valve F1 - Second compressor C2 - Second one-way valve S2 - Oil separator I1 - Second end of second four-way valve F2 - Fourth end of second four-way valve F2 - Second heat exchanger T2 - Second filter R2 - Third one-way valve S3 of second flow subunit 1112 - Drive cooling subunit - First electronic expansion valve V1 of first flow subunit 1111 - First filter R1 - First heat exchanger T1 - First end of second four-way valve F2 - Third end of second four-way valve F2 - Gas-liquid separator G1 - First compressor C1.

[0151] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0152] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a specific order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0153] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat pump system, characterized in that, The heat pump system includes a heat exchange module and a power module. The power module includes a first switching unit and multiple compressors, and the multiple compressors form a cycle with the heat exchange module through the first switching unit; wherein: The first switching unit is used to switch the connection relationship between the compressors, wherein the connection relationship is either parallel or series; The first switching unit includes a first four-way valve, and the compressor includes a first compressor and a second compressor, wherein: The first end of the first four-way valve is connected to the input end of the second compressor, the output end of the second compressor is connected to the input end of the heat exchange module, the second end of the first four-way valve is connected to the output end of the first compressor, the input end of the first compressor is connected to the output end of the heat exchange module, the third end of the first four-way valve is connected to the input end of the heat exchange module, and the fourth end of the first four-way valve is connected to the output end of the heat exchange module. In the first state, the first end of the first four-way valve is connected to the fourth end, the second end is connected to the third end, and the first compressor and the second compressor are connected in parallel. In the second state, the first end of the first four-way valve is connected to the second end, the third end is connected to the fourth end, and the first compressor and the second compressor are connected in series. The first switching unit further includes a first solenoid valve and a second solenoid valve; wherein: The first solenoid valve is disposed between the fourth end of the first four-way valve and the output end of the heat exchange module, and the second solenoid valve is disposed between the third end of the first four-way valve and the input end of the heat exchange module. In the first state, the first solenoid valve and the second solenoid valve are connected; in the second state, the first solenoid valve and the second solenoid valve are closed.

2. The heat pump system as described in claim 1, characterized in that, The first switching unit further includes a first check valve and a second check valve; wherein: The first check valve is disposed between the output end of the first compressor and the second end of the first four-way valve, wherein the conduction direction of the first check valve is from the first compressor to the first four-way valve; The second one-way valve is disposed between the output end of the second compressor and the input end of the heat exchange module, wherein the conduction direction of the second one-way valve is from the second compressor to the heat exchange module.

3. The heat pump system as described in claim 1, characterized in that, The first switching unit further includes an oil separator and a third solenoid valve; wherein: The oil separator is connected between the third end of the first four-way valve and the input end of the heat exchange module, and the oil outlet end of the oil separator is connected to the output end of the heat exchange module.

4. The heat pump system as described in claim 1, characterized in that, The heat exchange module includes a gas-liquid separator, a second four-way valve, and a heat exchange unit; wherein: The first end of the second four-way valve is connected to the first end of the heat exchange unit, the second end of the second four-way valve serves as the input end of the heat exchange module, the third end of the second four-way valve is connected to the second end of the heat exchange unit, the fourth end of the second four-way valve is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator serves as the output end of the heat exchange module; wherein: In cooling mode, the first end of the second four-way valve is connected to the second end, and the third end is connected to the fourth end. The refrigerant is input from the first end of the heat exchange unit and output from the second end. In heating mode, the third end of the second four-way valve is connected to the second end, and the first end is connected to the fourth end. The refrigerant is input from the second end of the heat exchange unit and output from the first end.

5. The heat pump system as described in claim 4, characterized in that, The heat exchange unit includes a first heat exchanger, a first filter, a flow direction subunit, a drive cooling subunit, a second filter, and a second heat exchanger; the flow direction subunit includes a first flow direction subunit and a second flow direction subunit, wherein the limiting conduction directions of the first flow direction subunit and the second flow direction subunit are different; wherein: The first end of the first heat exchanger serves as the first end of the heat exchange unit. The second end of the first heat exchanger is connected to the first end of the second heat exchanger in sequence through the first filter, the first flow direction subunit, the drive cooling subunit, the second flow direction subunit, and the second filter. The second end of the second heat exchanger serves as the second end of the heat exchange unit. Wherein, the restricted conduction direction of the first flow direction subunit is from the first filter to the drive cooling subunit, and the restricted conduction direction of the second flow direction subunit is from the drive cooling subunit to the second filter.

6. The heat pump system as described in claim 5, characterized in that, The compressor includes a first compressor and a second compressor. When the first compressor and the second compressor are connected in series, the first compressor is close to the input end of the power module, and the second compressor is close to the output end of the power module. The first compressor is a low-pressure stage compressor, and the second compressor is a high-pressure stage compressor. The heat exchange unit further includes an economizer plate heat exchanger and a second electronic expansion valve; wherein: The first end of the first heat exchange side of the economizer plate heat exchanger is connected to the second end of the first heat exchanger, and the second end of the first heat exchange side of the economizer plate heat exchanger is connected to the end of the first filter near the first heat exchanger. The second electronic expansion valve is connected between the second end of the first heat exchange side and the second end of the second heat exchange side of the economizer plate heat exchanger, and the first end of the second heat exchange side of the economizer plate heat exchanger is connected to the first compressor.

7. A control method for a heat pump system, characterized in that, Applicable to the heat pump system as described in any one of claims 1 to 6; The heat pump system control method includes: Determine the target connection relationship of the compressor; After controlling the first switching unit to connect the compressor in series or in parallel through the target connection relationship, it is connected to the heat exchange module.

8. The heat pump system control method as described in claim 7, characterized in that, The step of connecting the first switching unit to the heat exchange module after controlling the compressor to be connected in series or parallel through the target connection relationship includes: If the target connection is in parallel, then the first four-way valve is controlled to the first state; If the target connection is in series, then the first four-way valve is controlled to the second state.

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