Heat pump system and water heating device

Abstract

The invention provides a heat pump system and a water heating device, and relates to the technical field of heating, the heat pump system comprises a compressor, a gas cooler, a first heat exchanger, a refrigerant driving device and a second heat exchanger, and the heat pump system has a first working mode and a second working mode; when the first working mode is started, the compressor, the gas cooler, the second heat exchanger and the first heat exchanger sequentially communicate to form a first circulation loop; when the second working mode is started, the compressor and the second heat exchanger sequentially communicate to form a second circulation loop, and the refrigerant driving device, the second heat exchanger, the first heat exchanger and the gas cooler sequentially communicate to form a third circulation loop. The high-temperature refrigerant conveyed out by the compressor is conveyed to the second heat exchanger through the second circulation loop, the low-temperature refrigerant is conveyed to the second heat exchanger through the second circulation loop, and after the second heat exchanger conducts heat exchange on the high-temperature refrigerant and the low-temperature refrigerant, the high-temperature refrigerant enters the first heat exchanger to conduct defrosting on the outer surface of the first heat exchanger.

Description

Technical Field

[0001] The present application relates to the field of heating technology, and in particular to a heat pump system and a water heater. Background Art

[0002] When the air source heat pump is running at a low ambient temperature, if the temperature of the heat exchange tube of the evaporator is lower than 0℃ and lower than the dew point temperature of the outdoor air, the outer surface of the evaporator will frost. The accumulation of frost will weaken the heat exchange performance of the evaporator, hinder the heat absorption of the working fluid on the low-temperature heat source side, and cause the heating capacity of the air source heat pump to decrease, the performance coefficient to decrease, and in severe cases, the compressor will stop running. Therefore, how to defrost the evaporator has become an urgent problem to be solved. Summary of the invention

[0003] The present application provides a heat pump system and a hot water device, which can defrost an evaporator and is also applicable to the case where the evaporator is severely frosted.

[0004] In a first aspect, a heat pump system is provided, comprising: a compressor, a gas cooler, a first and a second heat exchanger, a refrigerant driving device and a second heat exchanger, the heat pump system having a first working mode and a second working mode; when the heat pump system is in the first working mode, the compressor, the gas cooler, the second heat exchanger, and the first and the second heat exchangers are connected in sequence to form a first circulation loop; when the heat pump system is in the second working mode, the compressor and the second heat exchanger are connected in sequence to form a second circulation loop, and the refrigerant driving device, the second heat exchanger, the first and the second heat exchanger, and the gas cooler are connected in sequence to form a third circulation loop.

[0005] In the above technical scheme, the present application forms a second circulation loop by connecting the compressor and the second heat exchanger in the heat pump system in sequence, and the refrigerant driving device, the second heat exchanger, the first and second heat exchangers, and the gas cooler are connected in sequence to form a third circulation loop, and the high-temperature refrigerant delivered by the compressor is transported to the second heat exchanger through the second circulation loop, and the low-temperature refrigerant is transported to the second heat exchanger through the second circulation loop. After the second heat exchanger performs heat exchange between the high-temperature refrigerant and the low-temperature refrigerant, the high-temperature refrigerant is transported to the first and second heat exchangers, thereby achieving defrosting of the outer surfaces of the first and second heat exchangers. When the second circulation loop and the third circulation loop of the heat pump system are connected, the high-temperature refrigerant delivered by the compressor is directly delivered to the second heat exchanger and is mainly used for heat exchange. The temperature of the refrigerant delivered by the second heat exchanger to the first and second heat exchangers is close to the temperature of the refrigerant delivered by the compressor. In this way, the defrosting principle realized by the cooperation of the second circulation loop and the third circulation loop is not only applicable to the situation where frosting of the outer surfaces of the first and second heat exchangers is serious, but also can shorten the defrosting time, which is conducive to allowing the heat pump system to restore its heating capacity as soon as possible in a short time, and effectively avoids the situation where the heat pump system cannot provide sufficient heat to the outside world due to frosting of the first and second heat exchangers.

[0006] In one possible implementation, the heat pump system also has a third operating mode; when the heat pump system is in the third operating mode, the compressor, the gas cooler, the second heat exchanger, the first and second heat exchangers are connected in sequence to form the first circulation loop, and the compressor, the second heat exchanger, the first and second heat exchangers are connected in sequence to form a fourth circulation loop.

[0007] In the above technical solution, when the heat pump system is in the third working mode, heating can be performed while achieving defrosting by connecting the first circulation loop and the fourth circulation loop, that is, a portion of the heating capacity can be retained during the process of accelerating defrosting. Among them, defrosting in the third working mode can slow down the frost on the outer surfaces of the first and second heat exchangers.

[0008] In a possible implementation, the heat pump system also includes: a four-way valve, the four-way valve having a first interface, a second interface, a third interface and a fourth interface, the first interface being connected to the compressor, the second interface being connected to the gas cooler, the third interface being connected to the second heat exchanger, and the fourth interface being connected to the first and second heat exchangers; when the heat pump system is in the first operating mode, the first interface is connected to the second interface; when the heat pump system is in the second operating mode, the first interface is connected to the third interface, and the second interface is connected to the fourth interface.

[0009] In a possible implementation, the heat pump system further includes: a bypass line and a first switch valve, one end of the bypass line is connected to the second interface, the other end of the bypass line is connected to the second heat exchanger, and the first switch valve is arranged in the bypass line.

[0010] In a possible implementation, the heat pump system further includes: a second switch valve, wherein the second switch valve is arranged between the second interface and the gas cooler.

[0011] In a possible implementation, the heat pump system also includes: a first pipeline, a second pipeline and a third pipeline, a third switch valve and a fourth switch valve; the gas cooler is connected to the third pipeline through the first pipeline, and the gas cooler is connected to the third pipeline through the second pipeline; the first pipeline and the second pipeline are both connected to the second heat exchanger through the third pipeline; the refrigerant drive device and the third switch valve are arranged in the first pipeline, and the third switch valve is located on the front side of the air intake end of the refrigerant drive device; the fourth switch valve is arranged in the second pipeline.

[0012] In a possible implementation, the heat pump system further includes: a first throttling device, wherein the first throttling device is disposed in the third pipeline.

[0013] In a possible implementation, the heat pump system also includes: a fifth switch valve, a sixth switch valve and a seventh switch valve, the fifth switch valve is arranged between the gas cooler and the second heat exchanger, the sixth switch valve is arranged between the first and second heat exchangers and the compressor, and the seventh switch valve is arranged between the third interface and the second heat exchanger.

[0014] In a possible implementation, the heat pump system further includes: a second throttling device, wherein the second throttling device is located in the second circulation loop and between the second heat exchanger and the compressor.

[0015] In a second aspect, a heat pump system is provided, comprising: a compressor, a gas cooler, a heat accumulator, a regenerator and an evaporator, the heat pump system having a first operating mode and a second operating mode; when the heat pump system is in the first operating mode, the compressor, the gas cooler, the regenerator, the evaporator and the regenerator are connected in sequence to form a first circulation loop; when the heat pump system is in the second operating mode, the compressor, the evaporator, the regenerator, the heat accumulator and the regenerator are connected in sequence to form a second circulation loop.

[0016] In the above technical scheme, the present application forms a refrigerant circulation loop by connecting the compressor, the evaporator, the heat regenerator, the heat accumulator, and the heat regenerator in the heat pump system in sequence, that is, realizing the reverse circulation of the refrigerant using the heat accumulator to defrost the evaporator. Because the high-temperature refrigerant delivered by the compressor directly enters the evaporator, the temperature loss of the high-temperature refrigerant can be very small, the evaporator can be defrosted quickly, the defrost efficiency of the evaporator is improved, and the defrost time is shortened, which is conducive to allowing the heat pump system to restore the heating capacity as soon as possible in a short time.

[0017] In one possible implementation, the heat pump system also has a third operating mode; when the heat pump system is in the third operating mode, the compressor, the heat accumulator, the heat regenerator, the evaporator and the heat regenerator are connected in sequence to form a third circulation loop, and the compressor, the gas cooler, the heat regenerator, the evaporator and the heat regenerator are connected in sequence to form the first circulation loop, so that heat storage can be achieved.

[0018] In a possible implementation, the heat pump system also includes: a four-way valve, the four-way valve having a first interface, a second interface, a third interface and a fourth interface; the first interface is connected to the compressor, the second interface is connected to the gas cooler and the heat accumulator, the third interface is connected to the regenerator, and the fourth interface is connected to the evaporator; when the heat pump system is in the first operating mode, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; when the heat pump system is in the second operating mode, the first interface is connected to the fourth interface, and the second interface is connected to the third interface.

[0019] In a possible implementation, the heat pump system further includes: a first stop valve and a second stop valve; the first stop valve is arranged between the regenerator and the gas cooler; the second stop valve is arranged between the regenerator and the heat accumulator.

[0020] In a possible implementation, the heat pump system further includes: a throttling device, wherein the throttling device is disposed between the regenerator and the evaporator.

[0021] In a third aspect, a water heating device is provided, comprising: the above-mentioned heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 An exemplary schematic diagram of a heat pump system provided by an embodiment of the present application is shown;

[0024] Figure 2 Shows Figure 1 A schematic diagram of an exemplary circulation loop for realizing heating by a heat pump system;

[0025] Figure 3 Shows Figure 1 A schematic diagram of an exemplary cycle loop for achieving defrosting with a heat pump system;

[0026] Figure 4 Shows Figure 1 Another exemplary cycle schematic diagram of a heat pump system for achieving defrosting;

[0027] Figure 5 Another exemplary schematic diagram of a heat pump system provided by an embodiment of the present application is shown;

[0028] Figure 6 Shows Figure 5 A schematic diagram of an exemplary circulation loop for realizing heating by a heat pump system;

[0029] Figure 7 Shows Figure 5 A schematic diagram of an exemplary cycle loop for achieving defrosting with a heat pump system;

[0030] Figure 8 Shows Figure 5 Schematic diagram of an exemplary circulation loop for realizing heat storage by a heat pump system in FIG.

[0031] Reference numerals of an exemplary embodiment of a heat pump system provided in an embodiment of the present application:

[0032] 1-compressor, 2-four-way valve, 3-seventh switch valve, 4-second throttling device, 5-second heat exchanger, 6-fifth switch valve, 7-first heat exchanger, 8-evaporating fan, 9-sixth switch valve, 10-first switch valve, 11-first throttling device, 12-third switch valve, 13-fourth switch valve, 14-gas cooler, 15-second switch valve, 16-sixth switch valve, 17-liquid storage tank.

[0033] Reference numerals for another exemplary embodiment of a heat pump system provided in an embodiment of the present application:

[0034] 1- compressor, 2- gas cooler, 3- heat accumulator, 4- regenerator, 5- evaporator, 6- evaporation fan, 7- low-pressure tank, 8- four-way valve, 9- throttling device, 10- first stop valve, 11- second stop valve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] At present, when the air source heat pump is operating in a low-temperature environment, if the temperature of the evaporator's heat exchange tube is lower than 0°C and lower than the dew point temperature of the outdoor air, frost will form on the outer surface of the evaporator. The accumulation of frost will weaken the heat exchange performance of the evaporator and hinder the heat absorption of the working fluid on the low-temperature heat source side, resulting in a decrease in the heating capacity of the air source heat pump and a decrease in the performance coefficient. In severe cases, the compressor will stop operating.

[0041] Based on the above problems, the embodiments of the present application provide a heat pump system and a hot water device, which can defrost the evaporator and are also suitable for situations where the evaporator is severely frosted.

[0042] The following is an exemplary embodiment of a heat pump system provided in an embodiment of the present application.

[0043] Figure 1 An exemplary schematic diagram of a heat pump system provided in an embodiment of the present application is shown. Figure 1 As shown, a heat pump system 100 provided in an embodiment of the present application includes a compressor 1, a gas cooler 14, a first heat exchanger 7, a refrigerant driving device 18, a second heat exchanger 5 and a liquid storage tank 17, and the liquid storage tank 17 is connected to the compressor 1. The first heat exchanger 7 can be an evaporator, and the second heat exchanger 5 can be a plate heat exchanger. The refrigerant stored in the liquid storage tank 17 is also called a refrigerant or a refrigerant, such as carbon dioxide or Freon. The heat pump system 100 has a first working mode and a second working mode, and the first working mode and the second working mode can be switched to each other. The first working mode can be understood as a heating mode, the heat pump system 100 turns on the first working mode, and the heat pump system 100 performs heating; the second working mode can be understood as a defrosting mode, the heat pump system 100 turns on the second working mode, and the heat pump system 100 mainly defrosts the first heat exchanger 7. Among them, the heating mode can be activated by a user trigger or automatically activated by the system through detection; the second working mode is generally automatically activated by system detection. For example, the outer surface temperature of the first heat exchanger 7 is detected by a temperature sensor arranged on the outer surface of the first heat exchanger 7, and the heat pump system 100 compares the outer surface temperature T0 with the first temperature threshold value T1. If the surface temperature T0 is less than or equal to the first temperature threshold value T1, the second working mode is activated to defrost the outer surface of the first heat exchanger 7.

[0044] Figure 2 Shows Figure 1 An exemplary cycle diagram of the heat pump system for achieving heating is shown in FIG. Figure 2As shown, when the heat pump system 100 is in the first working mode, that is, the first working mode is turned on, the compressor 1, the gas cooler 14, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a first circulation loop 1001. The flow direction of the refrigerant in the first circulation loop 1001 is: compressor 1-gas cooler 14-second heat exchanger 5-first heat exchanger 7-liquid storage tank 17-compressor 1. The high-temperature and high-pressure refrigerant delivered by the compressor 1 in the first circulation loop 1001 enters the gas cooler 14, and the gas cooler 14 releases heat into the air, and the heat pump system 100 achieves heating.

[0045] Figure 3 Shows Figure 1 An exemplary cycle diagram of a heat pump system for achieving defrosting is shown in FIG. Figure 3 As shown, when the heat pump system 100 is in the second working mode, that is, the second working mode is turned on, the compressor 1, the second heat exchanger 5, and the liquid storage tank 17 are connected in sequence to form a second circulation loop 1002, and the refrigerant driving device 18, the second heat exchanger 5, the first heat exchanger 7, and the gas cooler 14 are connected in sequence to form a third circulation loop 1003.

[0046] The flow direction of the refrigerant in the second circulation loop 1002 is: compressor 1-second heat exchanger 5-liquid storage tank 17-compressor 1; the flow direction of the refrigerant in the third circulation loop 1003 is: refrigerant driving device 18-second heat exchanger 5-first heat exchanger 7-gas cooler 14-refrigerant driving device 18. The refrigerant driving device 18 is used to drive the refrigerant in the third circulation loop 1003 to flow, and the refrigerant driving device 18 is, for example, a working fluid pump.

[0047] When the second working mode is turned on, the second circulation loop 1002 and the third circulation loop 1003 cooperate to achieve defrosting. The defrosting principle is: the high-temperature and high-pressure refrigerant delivered by the compressor 1 in the second circulation loop 1002 enters the second heat exchanger 5 through the hot side medium inlet end 53 of the second heat exchanger 5. Under the drive of the refrigerant driving device 18, the low-temperature refrigerant in the third circulation loop 1003 enters the second heat exchanger 5 through the cold side medium inlet end 51 of the second heat exchanger 5. The high-temperature refrigerant entering the second heat exchanger 5 exchanges heat with the low-temperature refrigerant. The cold side medium outlet end 52 of the second heat exchanger 5 delivers the high-temperature refrigerant. The high-temperature refrigerant delivered by the cold side medium outlet end 52 enters the first heat exchanger 7, thereby achieving defrosting of the outer surface of the first heat exchanger 7.

[0048] The present application forms a second circulation loop by connecting the compressor and the heat exchanger in the heat pump system in sequence, and forms a third circulation loop by connecting the refrigerant driving device, the heat exchanger, the evaporator, and the gas cooler in sequence, and the high-temperature refrigerant delivered by the compressor is delivered to the heat exchanger through the second circulation loop, and the low-temperature refrigerant is delivered to the heat exchanger through the second circulation loop. After the heat exchanger performs heat exchange between the high-temperature refrigerant and the low-temperature refrigerant, the high-temperature refrigerant is delivered to the evaporator, thereby achieving defrosting of the outer surface of the evaporator. When the heat pump system conducts the second circulation loop and the third circulation loop, the high-temperature refrigerant delivered by the compressor is directly delivered to the heat exchanger and is mainly used for heat exchange. The temperature of the refrigerant delivered to the evaporator by the heat exchanger is close to the temperature of the refrigerant delivered by the compressor. In this way, the defrosting principle realized by the cooperation of the second circulation loop and the third circulation loop is not only applicable to the severe frosting of the outer surface of the evaporator, but also can shorten the defrosting time, which is conducive to allowing the heat pump system to restore the heating capacity as soon as possible in a short time, and effectively avoids the situation where the heat pump system cannot provide enough heat to the outside world due to frosting of the evaporator.

[0049] In a possible implementation, the heat pump system 100 also has a third working mode, and any two of the first working mode, the second working mode and the third working mode can be switched between each other. The third working mode can be understood as a mode for defrosting and heating. When the heat pump system 100 turns on the third working mode, the heat pump system 100 not only performs heating, but also performs defrosting, and the two functions coexist.

[0050] Figure 4 Shows Figure 1 Another exemplary cycle schematic diagram of the heat pump system for achieving defrosting is shown in FIG. Figure 4 As shown, when the heat pump system 100 is in the third operating mode, that is, the third operating mode is turned on, the compressor 1, the gas cooler 14, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a first circulation loop 1001, and the compressor 1, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a fourth circulation loop 1004.

[0051] The flow direction of the refrigerant in the first circulation loop 1001 is: compressor 1-gas cooler 14-second heat exchanger 5-first heat exchanger 7-liquid storage tank 17-compressor 1. The high-temperature and high-pressure refrigerant delivered by the compressor 1 in the first circulation loop 1001 enters the gas cooler 14, and the gas cooler 14 releases heat into the air, and the heat pump system 100 realizes heating.

[0052] The flow direction of the refrigerant in the fourth circulation loop 1004 is: compressor 1 - second heat exchanger 5 - first heat exchanger 7 - liquid storage tank 17 - compressor 1. The high-temperature refrigerant delivered by the compressor 1 in the fourth circulation loop 1004 enters the second heat exchanger 5 through the cold-side medium inlet end 51 of the second heat exchanger 5, and the high-temperature refrigerant is delivered out from the cold-side medium outlet end 52 of the second heat exchanger 5. The high-temperature refrigerant delivered out from the cold-side medium outlet end 52 enters the first heat exchanger 7, thereby realizing defrosting of the outer surface of the first heat exchanger 7.

[0053] Among them, because in the third working mode, the heat pump system 100 not only heats but also defrosts, the refrigerant delivered by the compressor 1 is shunted by the first circulation loop 1001 and the fourth circulation loop 1004 in the third working mode. The heating capacity achieved by the first circulation loop 1001 in the third working mode is lower than the heating capacity achieved by the first circulation loop 1001 in the first working mode. The defrosting capacity achieved by the fourth circulation loop 1004 in the third working mode is lower than the defrosting capacity achieved by the cooperation of the second circulation loop 1002 and the third circulation loop 1003 in the second working mode. The fourth circulation loop 1004 in the third working mode can slow down the frosting on the outer surface of the first heat exchanger 7 on the premise that the heat pump system 100 is heating.

[0054] The third working mode is generally automatically turned on through system detection. For example, the outer surface temperature of the first heat exchanger 7 is detected by a temperature sensor disposed on the outer surface of the first heat exchanger 7. The heat pump system 100 compares the outer surface temperature T0 with a first temperature threshold T1 and a second temperature threshold T2. If the surface temperature T0 is greater than the first temperature threshold T1 and less than or equal to the second temperature threshold T2, the third working mode is turned on, and the heat pump system 100 heats and defrosts the outer surface of the first heat exchanger 7. Among them, T2 < T1. After the heat pump system 100 turns on the second working mode for defrosting, if it is detected that the outer surface temperature T0 of the first heat exchanger 7 increases, and the surface temperature T0 is greater than the first temperature threshold T1 and less than or equal to the second temperature threshold T2, it switches from the second working mode to the third working mode, so that when defrosting, the heat pump system 100 also heats, which affects the normal operation of the heat pump system 100. If it is detected that the outer surface temperature T0 of the first heat exchanger 7 is greater than the second temperature threshold T2, it switches from the third working mode to the first working mode, that is, the defrosting ends, and the heat pump system 100 completely resumes normal heating.

[0055] In a possible implementation manner, refer to Figure 1-Figure 4The heat pump system 100 also includes: a four-way valve 2, the four-way valve 2 has a first interface A1, a second interface B1, a third interface C1 and a fourth interface D1, the first interface A1 is connected to the compressor 1, the second interface B1 is connected to the gas cooler 14, the third interface C1 is connected to the second heat exchanger 5, the fourth interface D1 is connected to the first heat exchanger 7, and the fourth interface D1 is connected to the liquid storage tank 17.

[0056] When the heat pump system 100 is in the first working mode, the first interface A1 is connected to the second interface B1, and the compressor 1, the four-way valve 2, the gas cooler 14, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a first circulation loop 1001. When the heat pump system 100 is in the second working mode, the first interface A1 is connected to the third interface C1, the second interface B1 is connected to the fourth interface D1, the compressor 1, the four-way valve 2, the second heat exchanger 5, and the liquid storage tank 17 are connected in sequence to form a second circulation loop 1002; the refrigerant driving device 18, the second heat exchanger 5, the first heat exchanger 7, the four-way valve 2, and the gas cooler 14 are connected in sequence to form a third circulation loop 1003. When the heat pump system 100 is in the first working mode or the second working mode, the circulation loop corresponding to the first working mode or the second working mode can be connected by controlling the connection of the interface of the four-way valve 2, thereby realizing the heating or defrosting control of the heat pump system 100.

[0057] In a possible implementation, refer to Figure 1-Figure 4 The heat pump system 100 further includes a bypass pipeline L0 and a first switch valve 10. One end of the bypass pipeline L0 is connected to the second interface B1, and the other end of the bypass pipeline L0 is connected to the second heat exchanger 5. The first switch valve 10 is arranged in the bypass pipeline L0.

[0058] When the heat pump system 100 is in the third working mode, the first interface A1 is connected to the second interface B1, the first switch valve 10 is opened, the compressor 1, the four-way valve 2, the gas cooler 14, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a first circulation loop 1001; the compressor 1, the four-way valve 2, the first switch valve 10, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a fourth circulation loop 1004. Among them, when the heat pump system 100 is in the third working mode, if the first switch valve 10 is closed, the third working mode is switched to the first working mode, the heat pump system 100 performs heating, and the first switch valve 10 plays the role of conducting or blocking the bypass line L0.

[0059] When the heat pump system 100 is in any one of the first working mode, the second working mode and the third working mode, the circulation loop corresponding to any one of the first working mode, the second working mode and the third working mode can be connected by controlling the connectivity of the interface of the four-way valve 2, thereby realizing heating control, defrost control or control related to heating and defrost of the heat pump system 100.

[0060] In a possible implementation, refer to Figure 1-Figure 4 The heat pump system 100 further includes a second switch valve 15, which is arranged between the second interface B1 and the gas cooler 14. It can be understood that based on the arrangement positions of the first switch valve 10 and the second switch valve 15 in the heat pump system 100, a part of the refrigerant delivered from the second interface B1 enters the second heat exchanger 5 through the first switch valve 10, and another part of the refrigerant delivered from the second interface B1 enters the gas cooler 14 through the second switch valve 15. The openings of the first switch valve 10 and the second switch valve 15 can be adjusted. By adjusting the openings of the first switch valve 10 and / or the second switch valve 15, the amount of refrigerant entering the bypass line L0 and the amount of refrigerant entering the gas cooler 14 can be adjusted, so that the heating efficiency and the defrosting efficiency can be adjusted during the heating and defrosting control of the heat pump system 100. For example, the opening ratio of the first switch valve 10 and the second switch valve 15 is set to 7:3 in advance, that is, the amount of refrigerant entering the bypass line L0 is greater than the amount of refrigerant entering the gas cooler 14. The opening ratio of the first switch valve 10 and the second switch valve 15 can be set according to actual needs, and this application does not make a specific limitation.

[0061] In the case where the heat pump system 100 further includes the second switch valve 15, if the first working mode or the third working mode is turned on, the compressor 1, the four-way valve 2, the second switch valve 15, the gas cooler 14, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are sequentially connected to form a first circulation loop 1001. If the second working mode is turned on, the refrigerant driving device 18, the second heat exchanger 5, the first heat exchanger 7, the four-way valve 2, the second switch valve 15, and the gas cooler 14 are sequentially connected to form a third circulation loop 1003.

[0062] In a possible implementation, refer to Figure 1-Figure 4, the heat pump system 100 further includes a first pipeline L1, a second pipeline L2 and a third pipeline L3, a third switch valve 12 and a fourth switch valve 13. The gas cooler 14 is connected to the third pipeline L3 through the first pipeline L1, and the gas cooler 14 is connected to the third pipeline L3 through the second pipeline L2. The first pipeline L1 and the second pipeline L2 are both connected to the second heat exchanger 5 through the third pipeline L3. It can be understood that the first ends of the first pipeline L1 and the second pipeline L2 are simultaneously connected to the gas outlet end of the gas cooler 14, the second ends of the first pipeline L1 and the second pipeline L2 are simultaneously connected to the first end of the third pipeline L3, and the second end of the third pipeline L3 is connected to the second heat exchanger 5.

[0063] The refrigerant driving device 18 has an air inlet end and an air outlet end. The refrigerant driving device 18 and the third switch valve 12 are arranged in the first pipeline, and the third switch valve 12 is located in front of the air inlet end of the refrigerant driving device 18, that is, the third switch valve 12 is located between the gas cooler 14 and the refrigerant driving device 18. It should be understood that the first end of the first pipeline L1 is connected to the air outlet end of the gas cooler 14, the second end of the first pipeline L1 is connected to the first end of the third pipeline L3, the first end of the third switch valve 12 is connected to the first end of the first pipeline L1, the second end of the third switch valve 12 is connected to the air inlet end of the refrigerant driving device 18, and the air outlet end of the refrigerant driving device 18 is connected to the second end of the first pipeline L1. And the fourth switch valve 13 is arranged in the second pipeline L2. The refrigerant delivered from the air outlet of the gas cooler 14 can enter the third pipeline L3 through the third switch valve 12 and the refrigerant driving device 18 in the first pipeline L1 in sequence, and / or the refrigerant delivered from the air outlet of the gas cooler 14 can enter the third pipeline L3 through the fourth switch valve 13 in the second pipeline L2.

[0064] In the case where the heat pump system 100 further includes the first pipeline L1, the second pipeline L2 and the third pipeline L3, the third switch valve 12 and the fourth switch valve 13, if the first working mode or the third working mode is turned on, the compressor 1, the four-way valve 2, the second switch valve 15, the gas cooler 14, the fourth switch valve 13, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are connected in sequence to form a first circulation loop 1001. If the second working mode is turned on, the refrigerant driving device 18, the second heat exchanger 5, the first heat exchanger 7, the four-way valve 2, the second switch valve 15, the gas cooler 14, and the third switch valve 12 are connected in sequence to form a third circulation loop 1003.

[0065] In a possible implementation, refer to Figure 1-Figure 4The heat pump system 100 further includes a first throttling device 11, which is, for example, a throttling valve, and is disposed in the third pipeline L3. It can be understood that the first end of the bypass pipeline L0 is communicated with the second interface B1, and the second end of the bypass pipeline L0 is communicated with the middle pipe body of the third pipeline L3. The first throttling device 11 is disposed on the pipe body of the third pipeline L3 between the second end of the bypass pipeline L0 and the first end of the third pipeline L3. In this way, the first throttling device 11 can reduce the pressure of the refrigerant delivered by the refrigerant driving device 18 or the refrigerant delivered by the gas cooler 14, that is, the refrigerant entering the second heat exchanger 5 is the refrigerant after the pressure is reduced.

[0066] In the case where the heat pump system 100 further includes the first throttling device 11, if the first working mode or the third working mode is turned on, the compressor 1, the four-way valve 2, the second switch valve 15, the gas cooler 14, the fourth switch valve 13, the first throttling device 11, the second heat exchanger 5, the first heat exchanger 7, and the liquid storage tank 17 are sequentially connected to form a first circulation loop 1001. If the second working mode is turned on, the refrigerant driving device 18, the first throttling device 11, the second heat exchanger 5, the first heat exchanger 7, the four-way valve 2, the second switch valve 15, the gas cooler 14, and the third switch valve 12 are sequentially connected to form a third circulation loop 1003.

[0067] In a possible implementation, refer to Figure 1-Figure 4 The heat pump system 100 also includes: a fifth switch valve 6 , a sixth switch valve 9 and a seventh switch valve 3 .

[0068] The fifth switch valve 6 is arranged between the gas cooler 14 and the second heat exchanger 5. It can be understood that the fifth switch valve 6 is arranged between the second end of the bypass pipe L0 and the second heat exchanger 5, and the fifth switch valve 6 can adjust the flow rate of the refrigerant flowing into the second heat exchanger 5.

[0069] The sixth switch valve 9 is arranged between the first heat exchanger 7 and the compressor 1. It can be understood that the sixth switch valve 9 is arranged between the fourth interface D1 and the liquid storage tank 17. The fourth interface D1 is connected to the first heat exchanger 7 and the first end of the sixth switch valve 9 at the same time. The first heat exchanger 7 is connected to the first end of the sixth switch valve 9, and the second end of the sixth switch valve 9 is connected to the liquid storage tank 17. The sixth switch valve 9 includes at least one. When the sixth switch valve 9 includes two, for example, Figure 1-Figure 4 The sixth switch valve 9 and the sixth switch valve 16 are connected in series. The sixth switch valve 6 and the sixth switch valve 16 are connected in series. Setting multiple sixth switch valves 9 can finely control the flow of the refrigerant; in addition, it is also a redundant setting to ensure that even if one of the switch valves fails, the other can still continue to work to maintain the operation of the system and avoid the whole system stopping due to a single point failure.

[0070] The seventh switch valve 3 is disposed between the third interface C1 and the second heat exchanger 5 , and the seventh switch valve 3 can adjust the flow rate of the refrigerant flowing into the second heat exchanger 5 .

[0071] In the case where the heat pump system 100 further includes the fifth switch valve 6, the sixth switch valve 9 and the seventh switch valve 3, if the first working mode or the third working mode is turned on, the compressor 1, the four-way valve 2, the second switch valve 15, the gas cooler 14, the fourth switch valve 13, the first throttling device 11, the fifth switch valve 6, the second heat exchanger 5, the first heat exchanger 7, the sixth switch valve 9, and the liquid storage tank 17 are sequentially connected to form a first circulation loop 1001. If the second working mode is turned on, the compressor 1, the four-way valve 2, the seventh switch valve 3, the second heat exchanger 5, and the liquid storage tank 17 are sequentially connected to form a second circulation loop; the refrigerant driving device 18, the first throttling device 11, the fifth switch valve 6, the second heat exchanger 5, the first heat exchanger 7, the four-way valve 2, the second switch valve 15, the gas cooler 14, and the third switch valve 12 are sequentially connected to form a third circulation loop 1003.

[0072] In a possible implementation, refer to Figure 1-Figure 4 , the heat pump system 100 further includes: a second throttling device 4, such as a throttling valve. The second throttling device 4 is located in the second circulation loop 1002 and between the second heat exchanger 5 and the compressor 1. It can also be understood that the second throttling device 4 is arranged between the second heat exchanger 5 and the liquid storage tank 17. The second throttling device 4 is used to reduce the pressure of the refrigerant delivered by the second heat exchanger 5. In the case where the heat pump system 100 further includes the second throttling device 4, if the second working mode is turned on, the compressor 1, the four-way valve 2, the seventh switch valve 3, the second heat exchanger 5, the second throttling device 4, and the liquid storage tank 17 are sequentially connected to form a second circulation loop.

[0073] The following is another exemplary embodiment of a heat pump system provided in an embodiment of the present application.

[0074] Figure 5 Another exemplary schematic diagram of a heat pump system provided by an embodiment of the present application is shown. Figure 5 As shown, a heat pump system 200 provided in an embodiment of the present application includes: a compressor 1, a gas cooler 2, a heat accumulator 3, a regenerator 4, an evaporator 5 and a low-pressure tank 7, and the low-pressure tank 7 is connected to the compressor 1. The refrigerant stored in the low-pressure tank 7 is, for example, carbon dioxide or freon.

[0075] The heat pump system 200 has a first working mode and a second working mode, and the first working mode and the second working mode can be switched between each other. The first working mode can be understood as a heating mode. When the heat pump system 200 turns on the first working mode, the heat pump system 200 performs heating. The second working mode can be understood as a defrosting mode. When the heat pump system 200 turns on the second working mode, the heat pump system 200 mainly defrosts the evaporator 5. The heating mode can be turned on by a user trigger, or it can be turned on automatically by the system through detection. The second working mode is generally turned on automatically through system detection. For example, the outer surface temperature of the evaporator 5 is detected by a temperature sensor arranged on the outer surface of the evaporator 5. The heat pump system 200 compares the outer surface temperature t0 with the temperature threshold t1. If the surface temperature t0 is less than or equal to the temperature threshold t1, the second working mode is turned on to defrost the outer surface of the evaporator 5.

[0076] Figure 6 Shows Figure 5 An exemplary cycle diagram of the heat pump system for achieving heating is shown in FIG. Figure 6 As shown, when the heat pump system 200 is in the first working mode, that is, the first working mode is turned on, the compressor 1, the gas cooler 2, the regenerator 4, the evaporator 5, the regenerator 4 and the low-pressure tank 7 are connected in sequence to form a first circulation loop 2001, and the flow direction of the refrigerant in the first circulation loop 2001 is: compressor 1-gas cooler 2-regenerator 4-evaporator 5-regenerator 4-low-pressure tank 7-compressor 1. The high-temperature and high-pressure refrigerant delivered by the compressor 1 in the first circulation loop 2001 enters the gas cooler 2, and the gas cooler 2 releases heat into the air, and the heat pump system 200 realizes heating.

[0077] Figure 7 Shows Figure 5 An exemplary cycle diagram of a heat pump system for achieving defrosting is shown in FIG. Figure 7 As shown, when the heat pump system 200 is in the second working mode, that is, the second working mode is turned on, the compressor 1, the evaporator 5, the regenerator 4, the heat accumulator 3, the regenerator 4 and the low-pressure tank 7 are connected in sequence to form a second circulation loop 2002. The flow direction of the refrigerant in the second circulation loop 2002 is: compressor 1-evaporator 5-regenerator 4-heat accumulator 3-regenerator 4-low-pressure tank 7-compressor 1. The high-temperature and high-pressure refrigerant delivered by the compressor 1 in the second circulation loop 2002 is directly input into the evaporator 5, so as to realize defrosting of the outer surface of the evaporator 5.

[0078] The present application forms a refrigerant circulation loop by sequentially connecting the compressor, evaporator, heat regenerator, heat accumulator, and heat regenerator in the heat pump system, thereby realizing reverse circulation of the refrigerant using the heat accumulator to defrost the evaporator. Because the high-temperature refrigerant delivered by the compressor directly enters the evaporator, the temperature loss of the high-temperature refrigerant is very small, the evaporator can be defrosted quickly, the defrost efficiency of the evaporator is improved, and the defrost time is shortened, which is conducive to allowing the heat pump system to restore heating capacity as soon as possible in a short time.

[0079] In a possible implementation, the heat pump system 200 further has a third working mode, which can be understood as a heat storage mode, and any two working modes among the first working mode, the second working mode and the third working mode can be switched with each other.

[0080] Figure 8 Shows Figure 5 An exemplary cycle diagram of the heat pump system for realizing heat storage is shown in FIG. Figure 8 As shown, when the heat pump system 200 is in the third working mode, that is, the third working mode is turned on, the compressor 1, the heat accumulator 3, the regenerator 4, the evaporator 5, the regenerator 4, and the low-pressure tank 7 are sequentially connected to form the third circulation loop 2003, and the compressor 1, the gas cooler 2, the regenerator 4, the evaporator 5, the regenerator 4, and the low-pressure tank 7 are sequentially connected to form the first circulation loop 2001. The flow direction of the refrigerant in the third circulation loop 2003 is: compressor 1-heat accumulator 3, regenerator 4-evaporator 5-regenerator 4-low-pressure tank 7-compressor 1, and the high-temperature refrigerant output by the compressor 1 enters the regenerator 3 to achieve heat storage.

[0081] In a possible implementation, refer to Figure 5-Figure 8 The heat pump system 200 further includes a four-way valve 8, which has a first interface A2, a second interface B2, a third interface C2 and a fourth interface D2, and any two of the first interface A2, the second interface B2, the third interface C2 and the fourth interface D2 can be connected. The first interface A2 is connected to the compressor 1, the second interface B2 is connected to the gas cooler 2 and the heat accumulator 3, the third interface C2 is connected to the regenerator 4, and the fourth interface D2 is connected to the evaporator 5.

[0082] When the heat pump system 200 is in the first working mode, the first interface A2 is connected to the second interface B2, the third interface C2 is connected to the fourth interface D2, and the compressor 1, the four-way valve 8, the gas cooler 2, the regenerator 4, the evaporator 5, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are connected in sequence to form a first circulation loop 2001. When the heat pump system 200 is in the second working mode, the first interface A2 is connected to the fourth interface D2, the second interface B2 is connected to the third interface C2, and the compressor 1, the four-way valve 8, the evaporator 5, the regenerator 4, the heat accumulator 3, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are connected in sequence to form a second circulation loop 2002. When the heat pump system 200 is in the first working mode or the second working mode, the circulation loop corresponding to the first working mode or the second working mode can be connected by controlling the connection of the interface of the four-way valve 8, thereby realizing the heating or defrosting control of the heat pump system 200.

[0083] In a possible implementation, refer to Figure 5-Figure 8 The heat pump system 200 further includes a first stop valve 10 and a second stop valve 11 . The first stop valve 10 is disposed between the regenerator 4 and the gas cooler 2 , and the second stop valve 11 is disposed between the regenerator 4 and the heat accumulator 3 .

[0084] In the case where the heat pump system 200 further includes the first stop valve 10 and the second stop valve 11, if the first working mode is turned on, the compressor 1, the four-way valve 8, the gas cooler 2, the first stop valve 10, the regenerator 4, the evaporator 5, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are sequentially connected to form a first circulation loop 2001, wherein the first stop valve 10 is opened and the second stop valve 11 is closed. If the second working mode is turned on, the compressor 1, the four-way valve 8, the evaporator 5, the regenerator 4, the second stop valve 11, the heat accumulator 3, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are sequentially connected to form a second circulation loop 2002, wherein the second stop valve 11 is opened and the first stop valve 10 is closed. If the third working mode is turned on, the compressor 1, the four-way valve 8, the heat accumulator 3, the second stop valve 11, the regenerator 4, the evaporator 5, the four-way valve 8, the regenerator 4, and the low-pressure tank 7 are connected in sequence to form a third circulation loop 2003; the compressor 1, the four-way valve 8, the gas cooler 2, the first stop valve 10, the regenerator 4, the evaporator 5, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are connected in sequence to form a first circulation loop 2001, wherein the first stop valve 10 and the second stop valve 11 are both open.

[0085] By controlling the interface of the four-way valve 8 and the first stop valve 10 and the second stop valve 11, the circulation loops corresponding to the first working mode, the second working mode and the third working mode can be connected, thereby realizing heating or defrosting or heat storage control of the heat pump system 200.

[0086] In a possible implementation, refer to Figure 5-Figure 8 The heat pump system 200 further includes a throttling device 9, which is, for example, a throttling valve. The throttling device 9 is disposed between the regenerator 4 and the evaporator 5, and is used to reduce the pressure of the refrigerant flowing into the evaporator 5, or reduce the pressure of the refrigerant flowing into the regenerator 4.

[0087] In the case where the pump system 200 further includes a throttling device 9, if the first working mode is turned on, the compressor 1, the four-way valve 8, the gas cooler 2, the first stop valve 10, the regenerator 4, the throttling device 9, the evaporator 5, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are sequentially connected to form a first circulation loop 2001. If the second working mode is turned on, the compressor 1, the four-way valve 8, the evaporator 5, the throttling device 9, the regenerator 4, the second stop valve 11, the heat accumulator 3, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are sequentially connected to form a second circulation loop 2002. If the third working mode is turned on, the compressor 1, the four-way valve 8, the heat accumulator 3, the second stop valve 11, the regenerator 4, the throttling device 9, the evaporator 5, the four-way valve 8, the regenerator 4, and the low-pressure tank 7 are connected in sequence to form a third circulation loop 2003; the compressor 1, the four-way valve 8, the gas cooler 2, the first stop valve 10, the regenerator 4, the throttling device 9, the evaporator 5, the four-way valve 8, the regenerator 4 and the low-pressure tank 7 are connected in sequence to form a first circulation loop 2001.

[0088] For the circulation loop including the throttling device 9, if the first working mode is turned on, the first interface A2 of the four-way valve 8 is connected to the second interface B2, the third interface C2 is connected to the fourth interface D2, the first stop valve 10 is opened, and the second stop valve 11 is closed. The compressor 1 outputs high-temperature and high-pressure refrigerant into the gas cooler 2, the heat of the refrigerant is absorbed by water, the gas cooler 2 outputs medium-temperature and high-pressure refrigerant, and enters the regenerator 4, the heat of the refrigerant is absorbed again, the refrigerant enters the throttling device 9, is throttled into low-temperature and low-pressure liquid refrigerant, and enters the evaporator 5, the low-temperature liquid refrigerant exchanges heat with the air, and then enters the regenerator 4 through the four-way valve 8, the refrigerant entering the regenerator 4 through the four-way valve 8 exchanges heat with the medium-temperature and high-pressure refrigerant, and finally forms a gas refrigerant, the gas refrigerant output by the regenerator 4 enters the compressor 1 through the low-pressure tank 7 to achieve heating.

[0089] If the second working mode is turned on, the first port A2 of the four-way valve 8 is connected to the fourth port D2, the second port B2 is connected to the third port C2, the first stop valve 10 is closed, and the second stop valve 11 is opened.

[0090] The high-temperature and high-pressure refrigerant output by the compressor 1 directly enters the evaporator 5 through the four-way valve 8 for defrosting. The evaporator 5 outputs the medium-temperature and high-pressure refrigerant and enters the regenerator 4. The heat of the refrigerant is absorbed again. The refrigerant output by the regenerator 4 is throttled by the throttling device 9 and enters the heat accumulator 3 to absorb part of the heat and evaporate. The refrigerant output by the heat accumulator 3 enters the regenerator 4 through the four-way valve 8. The refrigerant in the heat accumulator 3 exchanges heat with the medium-temperature and high-pressure refrigerant to finally form a gas refrigerant. The gas refrigerant output by the regenerator 4 enters the compressor 1 through the low-pressure tank 7 to achieve defrosting.

[0091] If the third working mode is turned on, the first port A2 of the four-way valve 8 is connected to the second port B2, the third port C2 is connected to the fourth port D2, the first stop valve 10 is opened, and the second stop valve 11 is opened. The high-temperature and high-pressure refrigerant output by the compressor 1 is output through the second interface B2 of the four-way valve 8. A part of the high-temperature and high-pressure refrigerant output by the second interface B2 enters the gas cooler 2, and the heat of the refrigerant is absorbed by water to form a medium-temperature and high-pressure refrigerant. The other part enters the heat accumulator 3, and the heat of the refrigerant is absorbed by the phase change material in the heat accumulator 3. The refrigerants output by the heat accumulator 3 and the gas cooler 2 enter the regenerator 4 together. The refrigerant output by the regenerator 4 is throttled into a low-temperature and low-pressure liquid refrigerant through the throttling device 9 and enters the evaporator 5. The refrigerant entering the evaporator 5 exchanges heat with the air and then enters the regenerator 4 through the four-way valve 8. The refrigerant entering the regenerator 4 through the four-way valve 8 exchanges heat with the medium-temperature and high-pressure refrigerant to form a gas refrigerant. The gas refrigerant output by the regenerator 4 enters the compressor 1 through the low-pressure tank 7 to achieve heat storage.

[0092] When carbon dioxide is used as the refrigerant, for any working mode from the first working mode to the third working mode, when the heat pump system operates in each working mode, the pressure of the refrigerant returning to the compressor through the evaporator is reduced, so that the pressure of the refrigerant passing through the four-way valve again is reduced, which solves the problem of high pressure resistance of the four-way valve in the heat pump system using carbon dioxide as the refrigerant, and is conducive to ensuring the safe and efficient operation of the heat pump system.

[0093] The following is another exemplary embodiment of a water heating device provided in the embodiments of the present application.

[0094] A water heating device provided in the present application includes the heat pump system in the above-mentioned embodiment, for example, the heat pump system 100 or the heat pump system 200, and the water heating device is, for example, a water heater or a water heater.

[0095] If the hot water device includes a heat pump system 100, when heating is required, the first working mode corresponding to the heat pump system 100 is turned on; when defrosting is required, the second working mode or the third working mode corresponding to the heat pump system 100 is turned on. The second working mode can speed up defrosting, and the third working mode can slow down frosting and retain the heating capacity.

[0096] If the hot water device includes a heat pump system 200, when heating is required, the first working mode corresponding to the heat pump system 200 is turned on; when defrosting is required, the second working mode corresponding to the heat pump system 200 is turned on; when heat storage is required, the third working mode is turned on.

[0097] Since the water heating device adopts all technical solutions of all embodiments of the heat pump system 100 or the heat pump system 200, it has all the beneficial effects brought by the technical solutions of the heat pump system 100 or the heat pump system 200, which will not be described one by one here.

[0098] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0100] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made based on the concept of the present application and the contents of the present application description and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A heat pump system, characterized in that: The heat pump system comprises: a compressor, a gas cooler, a first heat exchanger, a refrigerant driving device and a second heat exchanger, and the heat pump system has a first working mode and a second working mode; When the heat pump system is in the first working mode, the compressor, the gas cooler, the second heat exchanger, and the first heat exchanger are connected in sequence to form a first circulation loop; When the heat pump system is in the second operating mode, the compressor and the second heat exchanger are connected in sequence to form a second circulation loop, and the refrigerant driving device, the second heat exchanger, the first heat exchanger, and the gas cooler are connected in sequence to form a third circulation loop.

2. The heat pump system according to claim 1, characterized in that: The heat pump system also has a third working mode; When the heat pump system is in the third operating mode, the compressor, the gas cooler, the second heat exchanger, and the first heat exchanger are connected in sequence to form the first circulation loop, and the compressor, the second heat exchanger, and the first heat exchanger are connected in sequence to form a fourth circulation loop.

3. The heat pump system according to claim 2, characterized in that: The heat pump system further comprises: a four-way valve, the four-way valve having a first interface, a second interface, a third interface and a fourth interface, the first interface being in communication with the compressor, the second interface being in communication with the gas cooler, the third interface being in communication with the second heat exchanger, and the fourth interface being in communication with the first heat exchanger; When the heat pump system is in the first working mode, the first interface is connected to the second interface; When the heat pump system is in the second working mode, the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface.

4. The heat pump system according to claim 3, characterized in that: The heat pump system further includes: a bypass pipeline and a first switch valve, one end of the bypass pipeline is communicated with the second interface, the other end of the bypass pipeline is communicated with the second heat exchanger, and the first switch valve is arranged in the bypass pipeline.

5. The heat pump system according to claim 4, characterized in that: The heat pump system further includes: a second switch valve, which is arranged between the second interface and the gas cooler.

6. The heat pump system according to claim 3, characterized in that: The heat pump system further comprises: a first pipeline, a second pipeline, a third pipeline, a third switch valve and a fourth switch valve; The gas cooler is in communication with the third pipeline via the first pipeline, and the gas cooler is in communication with the third pipeline via the second pipeline; The first pipeline and the second pipeline are both connected to the second heat exchanger through the third pipeline; The refrigerant driving device and the third switch valve are arranged in the first pipeline, and the third switch valve is located at the front side of the air inlet end of the refrigerant driving device; The fourth switch valve is arranged in the second pipeline.

7. The heat pump system according to claim 6, characterized in that: The heat pump system further includes: a first throttling device, which is arranged in the third pipeline.

8. The heat pump system according to claim 3 or 7, characterized in that: The heat pump system also includes: a fifth switch valve, a sixth switch valve and a seventh switch valve, the fifth switch valve is arranged between the gas cooler and the second heat exchanger, the sixth switch valve is arranged between the first heat exchanger and the compressor, and the seventh switch valve is arranged between the third interface and the second heat exchanger.

9. The heat pump system according to claim 1, characterized in that: The heat pump system further includes: a second throttling device, which is located in the second circulation loop and between the second heat exchanger and the compressor.

10. A heat pump system, characterized in that: The heat pump system comprises: a compressor, a gas cooler, a heat accumulator, a regenerator and an evaporator, and the heat pump system has a first working mode and a second working mode; When the heat pump system is in the first working mode, the compressor, the gas cooler, the regenerator, the evaporator and the regenerator are connected in sequence to form a first circulation loop; When the heat pump system is in the second working mode, the compressor, the evaporator, the regenerator, the heat accumulator, and the regenerator are connected in sequence to form a second circulation loop.

11. The heat pump system according to claim 10, characterized in that: The heat pump system also has a third working mode; When the heat pump system is in the third operating mode, the compressor, the heat accumulator, the regenerator, the evaporator and the regenerator are connected in sequence to form a third circulation loop, and the compressor, the gas cooler, the regenerator, the evaporator and the regenerator are connected in sequence to form the first circulation loop.

12. The heat pump system according to claim 11, characterized in that: The heat pump system further includes: a four-way valve, the four-way valve having a first interface, a second interface, a third interface and a fourth interface; The first interface is in communication with the compressor, the second interface is in communication with the gas cooler and the heat accumulator, the third interface is in communication with the regenerator, and the fourth interface is in communication with the evaporator; When the heat pump system is in the first working mode, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; When the heat pump system is in the second working mode, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface.

13. The heat pump system according to claim 12, characterized in that: The heat pump system further comprises: a first stop valve and a second stop valve; The first stop valve is arranged between the regenerator and the gas cooler; The second stop valve is arranged between the regenerator and the heat accumulator.

14. The heat pump system according to claims 10 to 13, characterized in that: The heat pump system further includes a throttling device, which is arranged between the regenerator and the evaporator.

15. A water heating device, characterized in that: The water heating device comprises: A heat pump system as claimed in any one of claims 1 to 14.

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