Air source cooling and heating heat pump device

Abstract

The utility model relates to the technical field of heat pump equipment, and discloses an air source cooling and heating heat pump device which comprises a shell, a first air duct structure, a frequency conversion controller and a fan structure. The frequency conversion controller is arranged in the second cavity, the fan structure is arranged in the first cavity, the first cavity is communicated with the second cavity through an air duct structure, one end of the air duct structure is communicated with the air inlet of the shell, the other end of the air duct structure is communicated with the first cavity, the first cavity is communicated with the air outlet, and a heat dissipation structure of the frequency conversion controller extends into the air duct structure. The fan structure rotates to drive the air to flow, so that the flowing air exchanges heat with the variable frequency controller, the heat dissipation efficiency of the variable frequency controller is improved, and the stability of the air source cold and warm heat pump device under the high-load working condition is guaranteed. The influence of the temperature of the fin type heat exchanger on the temperature of the frequency conversion controller is reduced, the heat dissipation efficiency of the frequency conversion controller is improved, the refrigeration effect is further improved, and the universality and applicability of the air source cooling and heating heat pump device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump equipment, in particular to an air source heating and cooling heat pump device. Background Art

[0002] With the gradual expansion of the application scope of coal-to-electricity conversion in the north, air-cooled heat pumps are used more and more widely in the heating market. Conventional heating and cooling heat pump units mainly focus on the heating function in application. In terms of refrigeration capacity, they are relatively weak compared with air conditioners and are difficult to meet the high requirements of some users for the refrigeration effect.

[0003] In the prior art, the fan of the heat pump drives the air to flow to exchange heat with the variable frequency controller, so as to cool the variable frequency controller. In the heating mode, the temperature of the fin heat exchanger is relatively low, so the temperature difference with the variable frequency controller is large, so as to realize effective heat exchange with the variable frequency controller, thereby reducing the temperature of the variable frequency controller. In the refrigeration mode, since the temperature at the fin heat exchanger is relatively high, the temperature of the variable frequency controller cannot be dissipated in time, so the operating frequency of the heat pump unit is reduced, resulting in poor refrigeration effect. Summary of the Utility Model

[0004] In view of this, the utility model provides an air source heating and cooling heat pump device to solve the problem that the heat dissipation efficiency of the variable frequency controller module in the existing heating and cooling heat pump unit is low, which easily leads to poor refrigeration effect.

[0005] To solve the above technical problems, the technical solution of the utility model is as follows:

[0006] The utility model provides an air source heating and cooling heat pump device, including: a housing, a first air duct structure, a variable frequency controller and a fan structure; an air inlet is provided on one side wall of the housing, an air outlet is provided on the other side wall of the housing, a first cavity and a second cavity are provided in the housing, and the first cavity is communicated with the air outlet; the first air duct structure is arranged in the housing, one end of the first air duct structure is communicated with the air inlet, the other end of the first air duct structure is communicated with the first cavity, and the second cavity is communicated with the middle of the first air duct structure; the variable frequency controller is arranged in the second cavity, a heat dissipation structure is arranged outside the variable frequency controller, and the heat dissipation structure extends into the air duct structure; the fan structure is arranged in the first cavity, and the fan structure rotates to drive air to enter from the air inlet, flow through the first air duct structure and the second cavity, and flow out from the air outlet.

[0007] It has the following advantages: By arranging a first cavity and a second cavity in the housing, placing the frequency conversion controller in the second cavity, and arranging the fan structure in the first cavity, the first cavity is communicated with the second cavity through an air duct structure. One end of the air duct structure is communicated with the air inlet of the housing, and the other end is communicated with the first cavity. The first cavity is communicated with the air outlet. The heat dissipation structure of the frequency conversion controller extends into the air duct structure. By rotating the fan structure to drive the air flow, the flowing air exchanges heat with the frequency conversion controller, improving the heat dissipation efficiency of the frequency conversion controller and ensuring the stability of the air source heat pump device under high load conditions. The fan structure drives the air to enter from the air inlet, passes through the first air duct and the second cavity and then discharges, forming an independent ventilation path to avoid the influence of the temperature of the fin heat exchanger on the temperature of the frequency conversion controller in the traditional technology, improving the heat dissipation efficiency of the frequency conversion controller, and further improving the refrigeration effect, so as to improve the versatility and applicability of the air source heat pump device.

[0008] According to some embodiments of the present invention, grille structures are provided at both the air inlet and the air outlet.

[0009] According to some embodiments of the present invention, the fan structure is communicatively connected to the frequency conversion controller. The frequency conversion controller is provided with a temperature sensor to monitor the temperature parameter of the frequency conversion controller and feedback it to the frequency conversion controller in real time. The frequency conversion controller controls the start and stop of the fan according to the temperature parameter.

[0010] According to some embodiments of the present invention, the air source heat pump device further includes: a compressor, a first heat exchanger, a second heat exchanger, and a throttling component; in the heating mode, the heat exchange medium flows out of the compressor, sequentially flows through the first heat exchanger, the throttling component, and the second heat exchanger, and then returns to the compressor; in the refrigeration mode, the heat exchange medium flows out of the compressor, sequentially flows through the second heat exchanger, the throttling component, and the first heat exchanger, and then returns to the compressor; the first heat exchanger is a plate heat exchanger, and the second heat exchanger is a fin heat exchanger.

[0011] According to some embodiments of the present invention, a second air duct structure is provided in the housing. One end of the second air duct structure is communicated with the second cavity, and the other end outlet of the air duct structure is arranged opposite to the second heat exchanger. The first air duct structure and the second air duct structure are separately arranged.

[0012] According to some embodiments of the present invention, the air source heat pump device further includes a spraying device. The spraying device is arranged outside the second heat exchanger. The spraying device is communicated with the water outlet of the first heat exchanger through a pipeline. The spraying device is adapted to spray warm water on the second heat exchanger to reduce the condensation temperature of the second heat exchanger.

[0013] According to some embodiments of the present utility model, a valve body is provided on the pipeline between the spraying device and the water outlet of the first heat exchanger. The valve body is communicatively connected to the frequency conversion controller, and the frequency conversion controller controls the opening degree of the valve body according to the external environmental temperature parameter.

[0014] According to some embodiments of the present utility model, the valve body is an electric ball valve. In the refrigeration mode, as the external environmental temperature increases, the frequency conversion controller controls the opening degree of the valve body to increase.

[0015] According to some embodiments of the present utility model, in the refrigeration mode, the valve body has at least a first opening degree, a second opening degree, and a third opening degree;

[0016] When the external environmental temperature is greater than T1 and less than T2, the valve body is at the first opening degree;

[0017] When the external environmental temperature is greater than T2 and less than T3, the valve body is at the second opening degree;

[0018] When the external environmental temperature is greater than T3 and less than T4, the valve body is at the third opening degree;

[0019] Wherein T1 < T2 < T3 < T4; the first opening degree is less than the second opening degree, and the second opening degree is less than the third opening degree.

[0020] According to some embodiments of the present utility model, the air source heating and cooling heat pump device further includes a reversing valve. The reversing valve is communicatively connected to the frequency conversion controller, and the frequency conversion controller controls the reversing of the reversing valve to control the switching between the heating mode and the refrigeration mode; the reversing valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is communicated with the discharge port of the compressor, the second valve port is communicated with the first heat exchanger, the third valve port is communicated with the first return port of the compressor, and the fourth valve port is communicated with the second heat exchanger; in the heating mode, the first valve port is communicated with the second valve port, and the third valve port and the fourth valve port are communicated; in the refrigeration mode, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1Schematic structural diagram of an air source heating and cooling heat pump device according to some embodiments of the present utility model;

[0023] Figure 2 External structure diagram of an air source heating and cooling heat pump device according to some embodiments of the present utility model;

[0024] Figure 3 Operating principle diagram of an air source heating and cooling heat pump device according to some embodiments of the present utility model.

[0025] Description of reference numerals:

[0026] 1. Housing; 11. Air inlet; 12. Air outlet; 13. First cavity; 14. Second cavity; 15. First air duct structure; 2. Fan structure; 3. Frequency conversion controller; 31. Heat dissipation structure; 4. Compressor; 5. First heat exchanger; 6. Second heat exchanger; 7. Spraying device; 71. Valve body; 8. Throttle assembly; 9. Reversing valve. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] Referring to Figure 1 and Figure 2 As shown, the present utility model provides an air source heating and cooling heat pump device, including: a housing 1, a first air duct structure 15, a variable frequency controller 3 and a fan structure 2; an air inlet 11 is provided on one side wall of the housing 1, an air outlet 12 is provided on the other side wall of the housing 1, a first cavity 13 and a second cavity 14 are provided inside the housing 1, and the first cavity 13 is communicated with the air outlet 12; the first air duct structure 15 is arranged inside the housing 1, one end of the first air duct structure 15 is communicated with the air inlet 11, the other end of the first air duct structure 15 is communicated with the first cavity 13, and the second cavity 14 is communicated with the middle of the first air duct structure 15; the variable frequency controller 3 is arranged inside the second cavity 14, a heat dissipation structure 31 is provided outside the variable frequency controller 3, and the heat dissipation structure 31 extends into the air duct structure; the fan structure 2 is arranged inside the first cavity 13, and the fan structure 2 rotates to drive air to enter from the air inlet 11, flow through the first air duct structure 15 and the second cavity 14, and flow out from the air outlet 12.

[0032] Specifically, by arranging the first cavity 13 and the second cavity 14 inside the housing 1, the variable frequency controller 3 is placed inside the second cavity 14, the fan structure 2 is arranged inside the first cavity 13, the first cavity 13 and the second cavity 14 are communicated through the air duct structure, one end of the air duct structure is communicated with the air inlet 11 of the housing 1, the other end is communicated with the first cavity 13, the first cavity 13 is communicated with the air outlet 12, the heat dissipation structure 31 of the variable frequency controller 3 extends into the air duct structure, and the fan structure 2 rotates to drive air to flow, so that the flowing air exchanges heat with the variable frequency controller 3, improving the heat dissipation efficiency of the variable frequency controller 3 and ensuring the stability of the air source heating and cooling heat pump device under high load conditions. The fan structure 2 drives air to enter from the air inlet 11, passes through the first air duct and the second cavity 14 and then discharges, forming an independent ventilation path to avoid the influence of the temperature of the fin heat exchanger on the temperature of the variable frequency controller 3 in the traditional technology, improving the heat dissipation efficiency of the variable frequency controller 3, and further improving the refrigeration effect, so as to improve the versatility and applicability of the air source heating and cooling heat pump device.

[0033] In some embodiments of the present utility model, grille structures are provided at both the air inlet 11 and the air outlet 12.

[0034] Specifically, the setting of the grille structure can effectively prevent foreign objects from entering the equipment, and at the same time ensure the smooth passage of air flow, further improving the working efficiency and reliability of the equipment.

[0035] In some embodiments of the present utility model, the fan structure 2 is communicatively connected to the variable frequency controller 3. The variable frequency controller 3 is provided with a temperature sensor for monitoring the temperature parameter of the variable frequency controller 3 and feeding it back to the variable frequency controller 3 in real time. The variable frequency controller 3 controls the start and stop of the fan according to the temperature parameter.

[0036] Specifically, the variable frequency controller 3 is provided with a temperature sensor for monitoring its operating temperature. When it is detected that the temperature of the variable frequency controller 3 exceeds the preset threshold, the temperature sensor feeds the signal back to the variable frequency controller 3. The variable frequency controller 3 automatically adjusts the operating state of the fan according to the temperature change, starting or stopping the fan, so as to ensure the heat dissipation effect of the variable frequency controller 3 and the stable operation of the equipment under different working environments.

[0037] Refer to Figure 3 As shown, in some embodiments of the present utility model, the air source heat pump device further includes: a compressor 4, a first heat exchanger 5, a second heat exchanger 6, and a throttling assembly 8; in the heating mode, the heat exchange medium flows out of the compressor 4, sequentially passes through the first heat exchanger 5, the throttling assembly 8, and the second heat exchanger 6, and then returns to the compressor 4; in the cooling mode, the heat exchange medium flows out of the compressor 4, sequentially passes through the second heat exchanger 6, the throttling assembly 8, and the first heat exchanger 5, and then returns to the compressor 4; the first heat exchanger 5 is a plate heat exchanger, and the second heat exchanger 6 is a fin heat exchanger.

[0038] It can be understood that in the heating mode, the high-temperature and high-pressure gaseous heat exchange medium enters the first heat exchanger 5 for heat exchange and condenses into a low-temperature and high-pressure liquid heat exchange medium. The low-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid heat exchange medium after passing through the throttling assembly 8. The low-temperature and low-pressure liquid heat exchange medium enters the second heat exchanger 6 for evaporation and heat exchange with air to form a cycle; in the cooling mode, the high-temperature and high-pressure gaseous heat exchange medium enters the second heat exchanger 6 for heat exchange and condenses into a low-temperature and high-pressure liquid heat exchange medium. The low-temperature and high-pressure liquid heat exchange medium becomes a low-temperature and low-pressure liquid heat exchange medium after passing through the throttling assembly 8. The low-temperature and low-pressure liquid heat exchange medium enters the first heat exchanger 5 for evaporation and heat exchange with water to form a cycle.

[0039] The throttling assembly 8 includes component structures such as an economizer, an electronic expansion valve, and a filter.

[0040] In some embodiments of the present utility model, a second air duct structure is provided inside the housing 1. One end of the second air duct structure is communicated with the second cavity 14, and the other end outlet of the air duct structure is disposed opposite to the second heat exchanger 6. The first air duct structure 15 and the second air duct structure are separately arranged.

[0041] Specifically, one end of the second air duct structure is connected to the second cavity 14, and the other end outlet is opposite to the second heat exchanger 6, and the first air duct structure 15 is separated from the second air duct structure, so as to achieve more efficient air diversion and heat dissipation effects, and ensure the reliable operation of the air source heat pump under different working conditions.

[0042] It can be understood that in the refrigeration mode, the fan structure 2 starts to cool the heat exchange medium. In the heating mode, the fan structure 2 starts, and the heat exchange medium absorbs heat from the air, avoiding frosting on the second heat exchanger 6 and improving the defrosting efficiency.

[0043] In some embodiments of the present invention, the air source heat pump device further includes a spraying device 7. The spraying device 7 is arranged outside the second heat exchanger 6. The spraying device 7 is communicated with the water outlet of the first heat exchanger 5 through a pipeline. The spraying device 7 is adapted to spray warm water on the second heat exchanger 6 to reduce the condensation temperature of the second heat exchanger 6.

[0044] Specifically, the spraying device 7 is arranged outside the second heat exchanger 6 and is communicated with the water outlet of the first heat exchanger 5 through a pipeline. In the refrigeration mode, the spraying device 7 sprays warm water on the second heat exchanger 6, thereby reducing the surface condensation temperature, enhancing the heat exchange efficiency, and improving the refrigeration effect.

[0045] In some embodiments of the present invention, a valve body 71 is provided on the pipeline between the spraying device 7 and the water outlet of the first heat exchanger 5. The valve body 71 is communicatively connected with the frequency conversion controller 3. The frequency conversion controller 3 controls the opening degree of the valve body 71 according to the external environmental temperature parameters.

[0046] Specifically, the frequency conversion controller 3 controls the opening degree of the valve body 71 according to the external environmental temperature parameters, ensuring that the air source heat pump device can achieve the best cooling effect according to different environmental temperatures.

[0047] In some embodiments of the present invention, the valve body 71 is an electric ball valve. In the refrigeration mode, as the external environmental temperature increases, the frequency conversion controller 3 controls the opening degree of the valve body 71 to increase.

[0048] In some embodiments of the present invention, in the refrigeration mode, the valve body 71 has at least a first opening degree, a second opening degree, and a third opening degree;

[0049] When the external environmental temperature is greater than T1 and less than T2, the valve body 71 is at the first opening degree;

[0050] When the external environmental temperature is greater than T2 and less than T3, the valve body 71 is at the second opening degree;

[0051] When the external environmental temperature is greater than T3 and less than T4, the valve body 71 is at the third opening degree;

[0052] Wherein, T1 < T2 < T3 < T4; the first opening degree is less than the second opening degree, and the second opening degree is less than the third opening degree.

[0053] Specifically, in the refrigeration mode, as the external environmental temperature rises, the variable frequency controller 3 controls the opening degree of the valve body 71 to gradually increase according to the detected temperature parameters, thereby enhancing the spraying effect of the spraying device 7 and reducing the temperature of the heat exchanger. Specifically, when the external temperature is from T1 to T2, the valve body 71 is at the first opening degree; when the temperature is from T2 to T3, the opening degree of the valve body 71 increases to the second opening degree; when the temperature is from T3 to T4, the valve body 71 reaches the third opening degree, so as to ensure that the air source heating and cooling heat pump device can maintain the best refrigeration working state within different temperature ranges.

[0054] In some embodiments of the present utility model, the air source heating and cooling heat pump device further includes a reversing valve 9, and the reversing valve 9 is communicatively connected with the variable frequency controller 3. The variable frequency controller 3 controls the reversing valve 9 to reverse to switch between the heating mode and the refrigeration mode; the reversing valve 9 includes a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is communicated with the discharge port of the compressor 4, the second valve port is communicated with the first heat exchanger 5, the third valve port is communicated with the first return port of the compressor 4, and the fourth valve port is communicated with the second heat exchanger 6; in the heating mode, the first valve port is communicated with the second valve port, and the third valve port and the fourth valve port are communicated; in the refrigeration mode, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port.

[0055] Specifically, through the function of the reversing valve 9, the air source heating and cooling heat pump device can efficiently switch between different working modes, improving the versatility.

[0056] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An air source cooling and heating heat pump device, characterized in that: include: A shell (1), wherein an air inlet (11) is provided on one side wall of the shell (1), an air outlet (12) is provided on the other side wall of the shell (1), a first cavity (13) and a second cavity (14) are provided in the shell (1), and the first cavity (13) is communicated with the air outlet (12); a first air duct structure (15) disposed in the housing (1), one end of the first air duct structure (15) being in communication with the air inlet (11), the other end of the first air duct structure (15) being in communication with the first cavity (13), and the second cavity (14) being in communication with the middle of the first air duct structure (15); A frequency conversion controller (3) is arranged in the second cavity (14); a heat dissipation structure (31) is arranged outside the frequency conversion controller (3); and the heat dissipation structure (31) extends into the air duct structure; A fan structure (2) is disposed in the first cavity (13), and the fan structure (2) rotates to drive air to enter from the air inlet (11), flow through the first air duct structure (15) and the second cavity (14), and then flow out from the air outlet (12).

2. The air source cooling and heating heat pump device according to claim 1, characterized in that: The air inlet (11) and the air outlet (12) are both provided with a grille structure.

3. The air source cooling and heating heat pump device according to claim 1, characterized in that: The fan structure (2) is in communication connection with the frequency conversion controller (3); the frequency conversion controller (3) is provided with a temperature sensor suitable for monitoring the temperature parameters of the frequency conversion controller (3) and providing real-time feedback to the frequency conversion controller (3); the frequency conversion controller (3) controls the start and stop of the fan according to the temperature parameters.

4. The air source cooling and heating heat pump device according to claim 1, characterized in that: Also includes: Compressor (4); A first heat exchanger (5) and a second heat exchanger (6); Throttle assembly (8); In the heating mode, the heat exchange medium flows out of the compressor (4), flows through the first heat exchanger (5), the throttling assembly (8) and the second heat exchanger (6) in sequence, and flows back to the compressor (4); In the cooling mode, the heat exchange medium flows out of the compressor (4), flows through the second heat exchanger (6), the throttling assembly (8) and the first heat exchanger (5) in sequence, and flows back into the compressor (4); The first heat exchanger (5) is a plate heat exchanger, and the second heat exchanger (6) is a fin heat exchanger.

5. The air source cooling and heating heat pump device according to claim 4, characterized in that: A second air duct structure is provided in the shell (1), one end of the second air duct structure is in communication with the second cavity (14), the other end of the air duct structure has an outlet arranged opposite to the second heat exchanger (6), and the first air duct structure (15) and the second air duct structure are arranged separately.

6. The air source cooling and heating heat pump device according to claim 5, characterized in that: The invention also comprises a spray device (7), wherein the spray device (7) is arranged outside the second heat exchanger (6), and the spray device (7) is connected to the water outlet of the first heat exchanger (5) through a pipeline, and the spray device (7) is suitable for spraying warm water to the second heat exchanger (6) to reduce the condensation temperature of the second heat exchanger (6).

7. The air source cooling and heating heat pump device according to claim 6, characterized in that: A valve body (71) is provided on the pipeline between the spray device (7) and the water outlet of the first heat exchanger (5). The valve body (71) is communicatively connected to the frequency conversion controller (3), and the frequency conversion controller (3) controls the opening degree of the valve body (71) according to the external environmental temperature parameter.

8. The air source cooling and heating heat pump device according to claim 7, characterized in that: The valve body (71) is an electric ball valve. In the refrigeration mode, as the external environmental temperature increases, the frequency conversion controller (3) controls the opening degree of the valve body (71) to increase.

9. The air source cooling and heating heat pump device according to claim 8, characterized in that: In the refrigeration mode, the valve body (71) has at least a first opening degree, a second opening degree, and a third opening degree. When the external environmental temperature is greater than T1 and less than T2, the valve body (71) is at the first opening degree. When the external environmental temperature is greater than T2 and less than T3, the valve body (71) is at the second opening degree. When the external environmental temperature is greater than T3 and less than T4, the valve body (71) is at the third opening degree. Where T1 < T2 < T3 < T4; the first opening degree is less than the second opening degree, and the second opening degree is less than the third opening degree.

10. The air source cooling and heating heat pump device according to claim 4, characterized in that: It further includes a reversing valve (9). The reversing valve (9) is communicatively connected to the frequency conversion controller (3), and the frequency conversion controller (3) controls the reversing of the reversing valve (9) to control the switching between the heating mode and the refrigeration mode. The reversing valve (9) includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is communicated with the discharge port of the compressor (4), the second valve port is communicated with the first heat exchanger (5), the third valve port is communicated with the first return port of the compressor (4), and the fourth valve port is communicated with the second heat exchanger (6). In the heating mode, the first valve port is communicated with the second valve port, and the third valve port and the fourth valve port are communicated; in the refrigeration mode, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port.

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