heat pump unit

Abstract

This utility model relates to the field of heat pump technology, specifically to a heat pump device. This application aims to solve the problem of condensation and safety hazards in the electrical control box during the defrosting process of heat pump devices. To this end, the heat pump device of this application includes: a compressor; a four-way valve, whose first and second interfaces are respectively connected to the compressor's exhaust port and intake port; a first heat exchanger, one end of which is connected to the third interface of the four-way valve; a first throttling element, one end of which is connected to the other end of the first heat exchanger; a second throttling element, one end of which is connected to the other end of the first throttling element; a second heat exchanger, one end of which is connected to the other end of the second throttling element, and the other end of which is connected to the fourth interface of the four-way valve; a first valve body, connected in parallel with the second throttling element via a first bypass pipe; and a portion of the refrigerant pipe between the first and second throttling elements cooling the electrical control components inside the electrical control box. This application can prevent condensation inside the electrical control box during the defrosting process, improving the safety of the device.

Description

Technical Field

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

[0002] Heat pumps, as devices that transfer heat energy from a lower heat source to a higher heat source, are increasingly accepted by users. Compared to fixed-frequency products, variable-frequency heat pumps are more popular in the market due to their advantages such as high control precision, high operating efficiency, and energy saving. However, the components inside the electrical control box of a variable-frequency heat pump are more complex than those in a fixed-frequency product, resulting in greater heat generation. Ordinary air cooling is no longer sufficient to meet their high heat dissipation requirements, especially for high-horsepower heat pumps.

[0003] To address this, one solution proposes introducing refrigerant piping into the electrical control box to assist in heat dissipation. This method not only effectively suppresses temperature rise within the control box but also promotes refrigerant phase change. Taking a heat pump water heater as an example, for heat pump devices that operate in a single mode year-round, a portion of the refrigerant piping located downstream of the water-side heat exchanger and upstream of the throttling element can be introduced into the electrical control box for heat dissipation. This method typically does not cause problems. However, in low-temperature, high-humidity winter environments, heat pump devices require reverse-circulation defrosting. In this case, the refrigerant flow direction is reversed; that is, the refrigerant only enters the electrical control box after being throttled and depressurized by the throttling element. At this point, the refrigerant temperature is too low, easily causing condensation inside the control box and creating a safety hazard.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] To address at least one of the aforementioned problems in the prior art, namely the issue of easy condensation and safety hazards in the electrical control box during the defrosting process of heat pump devices, this application provides a heat pump device. The heat pump device includes a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a first throttling element, a second throttling element, a first valve body, and an electrical control box. The compressor's exhaust port and intake port are respectively connected to the first and second interfaces of the four-way valve. The third interface of the four-way valve is connected to one end of the first heat exchanger, and the other end of the first heat exchanger is connected to the first throttling element. One end of the first throttling element is connected to the other end of the second throttling element, the other end of the second throttling element is connected to one end of the second heat exchanger, and the other end of the second heat exchanger is connected to the fourth port of the four-way valve. A portion of the refrigerant pipeline between the first throttling element and the second throttling element is configured to cool the electrical control components in the electrical control box. The first valve body is connected in parallel with the second throttling element through a first bypass pipeline, and the first valve body is configured to be open at least when the refrigerant flows from the second heat exchanger to the first heat exchanger.

[0006] The heat pump device of this application, by incorporating a second throttling element and a first valve body, with the first valve body connected in parallel with the second throttling element via a first bypass pipe, can prevent condensation inside the electrical control box during defrosting, thereby improving the device's safety. Specifically, during defrosting, the four-way valve reverses, and the refrigerant discharged from the compressor first passes through the first heat exchanger, then the second heat exchanger. After passing through the first heat exchanger, the first throttling element can be fully opened, and the second throttling element is used to throttle the refrigerant. At this time, the refrigerant, after passing through the first heat exchanger, first cools the electrical control components inside the electrical control box before undergoing throttling and pressure reduction, which can prevent condensation caused by excessively low refrigerant temperature and improve device safety.

[0007] In the preferred embodiment of the above-mentioned heat pump device, the first valve body is a one-way valve, which is configured to open when the refrigerant flows from the second heat exchanger to the first heat exchanger; or

[0008] The first valve body is an electrically controlled valve.

[0009] The first valve body is designed as a one-way valve, which can reduce production costs and improve product competitiveness while meeting the requirements for preventing condensation.

[0010] In the preferred embodiment of the above-mentioned heat pump device, the first throttling element is an electronic expansion valve.

[0011] In the preferred embodiment of the above-mentioned heat pump device, the second throttling element is a capillary tube.

[0012] The second throttling element is a capillary tube, which can reduce production costs and improve product competitiveness while meeting the defrosting throttling and pressure reduction requirements.

[0013] In the preferred embodiment of the above-mentioned heat pump device, the heat pump device further includes a second valve body, which is connected in parallel with the first throttling element through a second bypass pipe.

[0014] By setting a second valve body and connecting it in parallel with the first throttling element through a second bypass pipe, the second valve body can be used to bypass the first throttling element during defrosting, thus avoiding premature throttling and pressure reduction of the refrigerant caused by the maximum opening of the first throttling element being too small.

[0015] In the preferred embodiment of the above-mentioned heat pump device, the second valve body is a one-way valve, which is configured to open when the refrigerant flows from the first heat exchanger to the second heat exchanger; or

[0016] The second valve body is an electrically controlled valve.

[0017] The second valve body adopts a one-way valve, which can save production costs and improve product competitiveness while meeting the requirements.

[0018] In the preferred embodiment of the above-mentioned heat pump device, the first heat exchanger is an air-cooled heat exchanger, and the heat pump device further includes a fan, which is arranged corresponding to the first heat exchanger.

[0019] In the preferred embodiment of the above-mentioned heat pump device, the second heat exchanger is a water-cooled refrigerant heat exchanger, which has a first refrigerant interface, a second refrigerant interface, a first water interface, and a second water interface. The first refrigerant interface and the second refrigerant interface are respectively connected to the other end of the second throttling element and the fourth interface of the four-way valve. The first water interface and the second water interface are used for circulating communication with water-using equipment.

[0020] In the preferred embodiment of the above-mentioned heat pump device, the heat pump device is a heat pump water heater.

[0021] In the preferred embodiment of the above-mentioned heat pump device, the compressor, the four-way valve, the first heat exchanger, the second heat exchanger, the first throttling element, the second throttling element, the electrical control box, and the first valve body are all housed in the same outer casing. Attached Figure Description

[0022] The present application will now be described with reference to the accompanying drawings. In the drawings:

[0023] Figure 1 This is a system diagram of the heat pump device of this application;

[0024] Figure 2This is a schematic diagram of the heat pump device in the hot water production mode of this application.

[0025] Figure 3 This is a schematic diagram of the heat pump device in defrost mode according to this application.

[0026] List of reference numerals

[0027] 1. Compressor; 2. Four-way valve; 3. First heat exchanger; 4. Second heat exchanger; 5. First throttling element; 6. Second throttling element; 7. First valve body; 8. Second valve body; 9. Electrical control box; 10. Refrigerant piping; 11. First bypass piping; 12. Second bypass piping; 13. Fan. Detailed Implementation

[0028] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0029] It should be noted that in the description of this application, terms such as "upper," "lower," "left," and "right," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] First refer to Figure 1 The heat pump device of this application is described below.

[0032] like Figure 1 As shown, to address the issues of condensation and safety hazards posed by heat pump devices during the defrosting process inside the electrical control box, the heat pump device of this application includes a compressor 1, a four-way valve 2, a first heat exchanger 3, a second heat exchanger 4, a first throttling element 5, a second throttling element 6, a first valve body 7, and an electrical control box 9. The four-way valve 2 has four ports ( Figure 1The compressor 1's exhaust port and intake port are connected to the first port D and the second port S of the four-way valve 2, respectively. The third port E of the four-way valve 2 is connected to one end of the first heat exchanger 3. The other end of the first heat exchanger 3 is connected to one end of the first throttling element 5. The other end of the first throttling element 5 is connected to one end of the second throttling element 6. The other end of the second throttling element 6 is connected to one end of the second heat exchanger 4. The other end of the second heat exchanger 4 is connected to the fourth port C of the four-way valve 2. A portion of the refrigerant pipeline 10 between the first throttling element 5 and the second throttling element 6 is configured to cool the electrical control components inside the electrical control box 9. The first valve body 7 is connected in parallel with the second throttling element 6 via a first bypass pipeline 11, and the first valve body 7 is configured to be open at least when the refrigerant flows from the second heat exchanger 4 to the first heat exchanger 3.

[0033] In one possible implementation of an existing heat pump device, during normal operation, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the second heat exchanger 4 for condensation after passing through the four-way valve 2. The condensed refrigerant becomes a medium-temperature and medium-pressure liquid and dissipates heat for the electronic control components through the electrical control box 9. Then, the refrigerant becomes a low-temperature and low-pressure gas-liquid mixture after being throttled and depressurized by the first throttling element 5, and enters the first heat exchanger 3 for evaporation. The evaporated refrigerant absorbs heat and becomes a low-temperature and low-pressure gaseous refrigerant, which returns to the compressor 1 via the four-way valve 2 to continue the cycle.

[0034] When operating in winter, the first heat exchanger 3 acts as an evaporator, making it prone to frost formation. When defrosting the first heat exchanger 3 is required, the four-way valve 2 reverses, allowing the high-temperature, high-pressure refrigerant discharged from the compressor 1 to first pass through the first heat exchanger 3 for defrosting, transforming it into a medium-temperature, medium-pressure refrigerant. However, in existing heat pump devices, the refrigerant continues to flow through the first throttling element 5, becoming a low-temperature, low-pressure gas-liquid mixture. At this point, the refrigerant temperature is low, and if it enters the electrical control box 9 to cool the electrical control components, condensation can easily occur, leading to a safety hazard.

[0035] In the heat pump device of this application, the first throttling element 5 can be fully opened during defrosting. At this time, the medium-temperature and medium-pressure refrigerant first passes through the electrical control box 9 to dissipate heat from the electrical control components and prevent condensation from forming inside the electrical control box 9. Then, it passes through the second throttling element 6 to reduce its pressure and become a low-temperature and low-pressure gas-liquid mixture refrigerant. It then enters the second heat exchanger 4 to evaporate. The evaporated refrigerant becomes a low-temperature and low-pressure gaseous refrigerant and returns to the compressor 1 through the four-way valve 2. Since this application is equipped with a first valve body 7, the first valve body 7 can be opened when the refrigerant flows from the second heat exchanger 4 to the first heat exchanger 3. Therefore, during normal operation, the refrigerant will flow through the first valve body 7, bypassing the second throttling element 6.

[0036] As can be seen, the heat pump device of this application, by setting a second throttling element 6 and a first valve body 7 in the heat pump device, and the first valve body 7 being set in parallel with the second throttling element 6 through a first bypass pipe 11, can prevent condensation in the electrical control box 9 during defrosting and improve the safety of the device.

[0037] The following further combines Figure 1 This paper describes a specific embodiment of the heat pump device of this application.

[0038] like Figure 1 As shown, in one specific embodiment, the heat pump device is a heat pump water heater, which includes a compressor 1, a four-way valve 2, a first heat exchanger 3, a second heat exchanger 4, a first throttling element 5, a second throttling element 6, a first valve body 7, a second valve body 8, an electrical control box 9, and a fan 13. All of the above components are housed in the same housing, and are thus sold as a complete unit.

[0039] The discharge port of compressor 1 is connected to the first port D of four-way valve 2 via refrigerant line 10. The suction port of compressor 1 is connected to the second port S of four-way valve 2 via refrigerant line 10. The third port E of four-way valve 2 is connected to one end of first heat exchanger 3 via refrigerant line 10. The other end of first heat exchanger 3 is connected to one end of first throttling element 5 via refrigerant line 10. The other end of first throttling element 5 is connected to one end of second throttling element 6 via refrigerant line 10. The other end of second throttling element 6 is connected to one end of second heat exchanger 4 via refrigerant line 10. The other end of second heat exchanger 4 is connected to the fourth port C of four-way valve 2 via refrigerant line 10. A portion of the refrigerant line 10 between first throttling element 5 and second throttling element 6 passes through electrical control box 9 to dissipate heat from the electrical control components within electrical control box 9. For example, a portion of the refrigerant pipe 10 between the first throttling element 5 and the second throttling element 6 can be installed inside the electrical control box 9, and the heat dissipation of the electrical control element can be achieved by exchanging heat with the air inside the electrical control box 9.

[0040] Furthermore, the first heat exchanger 3 is an air-cooled heat exchanger, such as a finned heat exchanger, and the fan 13 is provided corresponding to the first heat exchanger 3. The second heat exchanger 4 is a water-cooled heat exchanger, more specifically a shell-and-tube heat exchanger. The shell-and-tube heat exchanger has a first refrigerant interface, a second refrigerant interface, a first water interface, and a second water interface. The first refrigerant interface and the second refrigerant interface are respectively connected to the other end of the second throttling element 6 and the fourth interface C of the four-way valve 2. The first water interface and the second water interface are used for circulating connection with water-using equipment, such as the first water interface and the second water interface being circulatedly connected to the insulated water tank through water pipes.

[0041] Furthermore, the first throttling element 5 is an electronic expansion valve, and the second throttling element 6 is a capillary tube. Both the first valve body 7 and the second valve body 8 are one-way valves. The first valve body 7 is connected in parallel with the second throttling element 6 via a first bypass pipe 11, and is configured to be open when the refrigerant flows from the second heat exchanger 4 to the first heat exchanger 3. The second valve body 8 is connected in parallel with the first throttling element 5 via a second bypass pipe 12, and is configured to be open when the refrigerant flows from the first heat exchanger 3 to the second heat exchanger 4. It should be noted that although the above description uses "parallel" to describe the positional relationship between the first valve body 7 and the second throttling element 6, and between the second valve body 8 and the first throttling element 5, this does not refer to the electrical connection method. Rather, this application borrows the "parallel" connection method from electrical engineering to describe the relative positional relationship between the first valve body 7 and the second throttling element 6, and between the second valve body 8 and the first throttling element 5. This descriptive method achieves the purpose of conciseness and clarity. In reality, those skilled in the art will understand that the first valve body 7 is connected in parallel with the second throttling element 6 through the first bypass pipe 11, that is, one end of the first bypass pipe 11 ( Figure 1 The upper end shown is connected to one end of the second throttling element 6. Figure 1 On the refrigerant pipe 10 between the upper end shown and the electrical control box 9, the other end (shown at the upper end) Figure 1 The lower end shown is connected to the other end of the second throttling element 6. Figure 1 The refrigerant pipe 10 between the lower end shown and the second heat exchanger 4. Similarly, the second valve body 8 is connected in parallel with the first throttling element 5 through the second bypass pipe 12, that is, one end of the second bypass pipe 12 (shown at the lower end) is connected to the first throttling element 5. Figure 1 The upper left end shown is connected to one end of the first heat exchanger 3. Figure 1 On the refrigerant pipe 10 between the left end shown and one end of the first throttling element 5, the other end (shown on the left) Figure 1 The right end shown is connected to the refrigerant pipe 10 between the other end of the first throttling element 5 and the electrical control box 9.

[0042] The following is combined Figure 2 and Figure 3 The working principle of the heat pump water heater of this application will be introduced.

[0043] like Figure 2As shown, during normal hot water production, the first throttling element 5 opens to a certain degree. The high-temperature, high-pressure refrigerant discharged from the compressor 1 enters the second heat exchanger 4 through the first port D and the fourth port C of the four-way valve 2 to exchange heat with the circulating water, thus producing hot water. After heat exchange, the refrigerant becomes a medium-temperature, medium-pressure liquid and enters the electrical control box 9 through the first valve body 7 to dissipate heat from the electrical control components in the electrical control box 9. Then, after the refrigerant is throttled and depressurized by the first throttling element 5, it becomes a low-temperature, low-pressure gas-liquid mixture and enters the first heat exchanger 3 to exchange heat with the ambient air. After heat exchange, the refrigerant absorbs heat and becomes a low-temperature, low-pressure gaseous refrigerant, which returns to the compressor 1 through the third port E and the second port S of the four-way valve 2 to continue the cycle.

[0044] like Figure 3 As shown, when the first heat exchanger 3 needs defrosting due to frost buildup, the first throttling element 5 closes, and the four-way valve 2 reverses direction. The high-temperature, high-pressure refrigerant discharged from the compressor 1 enters the first heat exchanger 3 after passing through the first port D and the third port E of the four-way valve 2, where it exchanges heat with the outdoor air, thus defrosting the first heat exchanger 3. After heat exchange, the refrigerant becomes a medium-pressure liquid and enters the electrical control box 9 after passing through the second valve body 8, where it dissipates heat from the electrical control components. Then, the refrigerant passes through the second throttling element 6, where it is throttled and depressurized, becoming a low-temperature, low-pressure gas-liquid mixture. It then enters the second heat exchanger 4 to exchange heat with the circulating water. After heat exchange, the refrigerant absorbs heat and becomes a low-temperature, low-pressure gaseous refrigerant, which returns to the compressor 1 via the fourth port C and the second port S of the four-way valve 2 to continue circulating.

[0045] In the above configuration, the first valve body 7 and the second valve body 8 are both one-way valves, and the second throttling element 6 is a capillary tube. This configuration can meet the anti-condensation requirements while reducing production costs, maximizing the product's cost-effectiveness and thus improving its competitiveness. By setting the second valve body 8 and connecting it in parallel with the first throttling element 5 through the second bypass pipe 12, the second valve body 8 can bypass the first throttling element 5 during defrosting, avoiding premature refrigerant throttling and pressure reduction caused by the maximum opening of the first throttling element 5 being too small.

[0046] It should be noted that the above preferred embodiments are merely illustrative of the principles of this application and are not intended to limit the scope of protection of this application. Without departing from the principles of this application, those skilled in the art can adjust the above settings to make this application applicable to more specific application scenarios.

[0047] For example, in an alternative embodiment, although the above embodiment is described using an electronic expansion valve as the first throttling element 5 and a capillary tube as the second throttling element 6 as an example, this is only a preferred embodiment. Those skilled in the art can adjust the two as long as they can achieve the function of throttling and reducing pressure. The first throttling element 5 can also be a thermostatic expansion valve or a capillary tube, and the second throttling element 6 can also be a thermostatic expansion valve or an electronic expansion valve. Of course, following the above adjustments will not be conducive to improving the overall cost-effectiveness of the machine.

[0048] For example, in another alternative embodiment, although both the first valve body 7 and the second valve body 8 are described using a check valve as an example, the specific forms of the first valve body 7 and the second valve body 8 are not fixed, and those skilled in the art can adjust them based on specific application scenarios. For example, at least one of the first valve body 7 and the second valve body 8 can be replaced with a solenoid valve or other electric valves, but when using electric valves, it is obviously less cost-effective than using check valves.

[0049] For example, in another alternative embodiment, although the above embodiment is described with the second valve body 8 as an example, the second valve body 8 is not necessary. Those skilled in the art can selectively omit the valve and achieve the corresponding function by controlling the opening of the first throttling element 5.

[0050] For example, in another alternative implementation, the use of an air-cooled heat exchanger as the first heat exchanger 3 is merely one possible implementation. This application does not limit the specific structural form of the first heat exchanger 3, and those skilled in the art can choose based on the application scenario. For instance, the first heat exchanger 3 can also be a water-cooled heat exchanger or a microchannel heat exchanger, etc.

[0051] For example, in another alternative implementation, using a shell-and-tube heat exchanger as the second heat exchanger 4 is merely one feasible implementation method for a heat pump water heater. Besides a shell-and-tube heat exchanger, the second heat exchanger 4 can also be a shell-and-tube heat exchanger or a plate heat exchanger. Of course, when the heat pump device is applied to other application scenarios, the second heat exchanger 4 also needs to be adjusted accordingly. For example, when used as a heat pump air conditioner, the second heat exchanger 4 can be replaced with an air-cooled heat exchanger.

[0052] For example, in another alternative embodiment, although the above preferred embodiment is described in conjunction with a heat pump water heater, this is merely exemplary. Those skilled in the art can apply this application to other heat pump devices, such as heat pump air conditioners, heat pump heating machines, etc.

[0053] For example, when a heat pump device is applied to a water heater, the arrangement of compressor 1, four-way valve 2, first heat exchanger 3, second heat exchanger 4, first throttling element 5, second throttling element 6, first valve body 7, second valve body 8, electrical control box 9 and fan 13 in the same housing to form a complete unit is merely an example. Those skilled in the art can disassemble some of the components and place them in other locations, and such changes do not deviate from the principles of this application.

[0054] For example, in another alternative embodiment, although the above embodiment is described in conjunction with the placement of a portion of the refrigerant pipe 10 between the first throttling element 5 and the second throttling element 6 inside the electrical control box 9 to dissipate heat from the electrical control components, this is only one possible implementation for heat dissipation of the electrical control components inside the electrical control box 9. In other embodiments, as long as heat dissipation of the electrical control components inside the electrical control box 9 is achieved, those skilled in the art can adjust the specific arrangement of the refrigerant pipe 10. For example, a portion of the refrigerant pipe 10 between the first throttling element 5 and the second throttling element 6 can be placed outside the electrical control box 9, indirectly achieving heat dissipation of the internal electrical control components through heat exchange with the air outside the electrical control box 9.

[0055] Of course, the alternative implementation methods described above, as well as the alternative implementation methods and preferred implementation methods, can be used in combination to create new implementation methods that are suitable for more specific application scenarios.

[0056] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0057] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A heat pump device, characterized in that, The heat pump device includes a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a first throttling element, a second throttling element, a first valve body, and an electrical control box. The exhaust port and intake port of the compressor are respectively connected to the first and second interfaces of the four-way valve. The third interface of the four-way valve is connected to one end of the first heat exchanger. The other end of the first heat exchanger is connected to one end of the first throttling element. The other end of the first throttling element is connected to one end of the second throttling element. The other end of the second throttling element is connected to one end of the second heat exchanger. The other end of the second heat exchanger is connected to the fourth interface of the four-way valve. A portion of the refrigerant pipeline between the first and second throttling elements is configured to cool the electrical control components in the electrical control box. The first valve body is connected in parallel with the second throttling element through a first bypass pipeline, and the first valve body is configured to be open at least when the refrigerant flows from the second heat exchanger to the first heat exchanger.

2. The heat pump device according to claim 1, characterized in that, The first valve body is a one-way valve, which is configured to open when refrigerant flows from the second heat exchanger to the first heat exchanger; or The first valve body is an electrically controlled valve.

3. The heat pump device according to claim 1, characterized in that, The first throttling element is an electronic expansion valve.

4. The heat pump device according to claim 1, characterized in that, The second throttling element is a capillary tube.

5. The heat pump device according to claim 1, characterized in that, The heat pump device further includes a second valve body, which is connected in parallel with the first throttling element via a second bypass pipe.

6. The heat pump device according to claim 5, characterized in that, The second valve body is a one-way valve, which is configured to open when refrigerant flows from the first heat exchanger to the second heat exchanger; or The second valve body is an electrically controlled valve.

7. The heat pump device according to claim 1, characterized in that, The first heat exchanger is an air-cooled heat exchanger, and the heat pump device further includes a fan, which is set corresponding to the first heat exchanger.

8. The heat pump device according to claim 1, characterized in that, The second heat exchanger is a water-cooled refrigerant heat exchanger, which has a first refrigerant interface, a second refrigerant interface, a first water interface, and a second water interface. The first refrigerant interface and the second refrigerant interface are respectively connected to the other end of the second throttling element and the fourth interface of the four-way valve. The first water interface and the second water interface are used for circulating communication with water-using equipment.

9. The heat pump device according to claim 1, characterized in that, The heat pump device is a heat pump water heater.

10. The heat pump device according to claim 9, characterized in that, The compressor, the four-way valve, the first heat exchanger, the second heat exchanger, the first throttling element, the second throttling element, the electrical control box, and the first valve body are all housed in the same housing.

Images