Refrigeration system

Abstract

The utility model relates to the technical field of refrigeration, in particular to a refrigeration system. The refrigerating system comprises a first heat exchange flow path, a second heat exchange flow path, a cooling flow path, a compressor and a four-way reversing valve, one end of the first heat exchange flow path and one end of the second heat exchange flow path communicate with the four-way reversing valve, and the other end of the first heat exchange flow path and the other end of the second heat exchange flow path communicate with the cooling flow path. An inlet and an outlet of the compressor are communicated with the four-way reversing valve; wherein the refrigerating system has a refrigerating mode and a heating mode, a cooling part and an expansion valve are arranged on the cooling flow path, and in the refrigerating mode or the heating mode, the cooling part is located on the upstream of the expansion valve in the heat exchange medium flow path direction of the refrigerating system. The heat exchanger has the advantages that by arranging the first branch, the second branch and the switch parts on the first branch and the second branch, the heat exchange medium can still be guided to pass through the cooling part and then pass through the expansion valve, and the problem that condensed water appears on the cooling part after the heat exchange medium is throttled and cooled through the expansion valve is solved.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and in particular to a refrigeration system. Background Technology

[0002] A refrigeration system typically includes a compressor, a heat exchanger, a cooling module, and an electronic expansion valve. The heat exchange medium is pressurized in the compressor to a high-temperature, high-pressure gaseous state. It exchanges heat with the external environment in the heat exchanger, releasing energy to the outside. After passing through the cooling module to cool the components and the electronic expansion valve to throttle and reduce pressure, it becomes a low-temperature, low-pressure gas-liquid two-phase state.

[0003] When the refrigeration system is in cooling mode, the heat exchange medium first flows through the cooling module and then through the electronic expansion valve. The temperature of the heat exchange medium is relatively high when it enters the cooling module, and no condensation is generated. However, when the refrigeration system is in heating mode, the heat exchange medium first passes through the expansion valve for throttling, becoming a low-temperature, low-pressure gas-liquid two-phase state before entering the cooling module. This results in the heat exchange medium being at an excessively low temperature when it enters the cooling module, making it prone to condensation on the surface of the cooling module and potentially damaging components. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a refrigeration system.

[0005] A refrigeration system includes a first heat exchange flow path, a second heat exchange flow path, a cooling flow path, a compressor, and a four-way reversing valve. One end of the first heat exchange flow path and one end of the second heat exchange flow path are connected to the four-way reversing valve, and the other end of the first heat exchange flow path and the other end of the second heat exchange flow path are connected to the cooling flow path. The inlet and outlet of the compressor are connected to the four-way reversing valve.

[0006] The refrigeration system has a refrigeration mode and a heating mode. A cooling element and an expansion valve are provided on the cooling flow path. In the refrigeration mode or the heating mode, the cooling element is located upstream of the expansion valve along the heat exchange medium flow path of the refrigeration system.

[0007] With this configuration, the first and second heat exchange paths are connected in parallel. At any given time, the heat exchange medium flows in only one of these paths. When the refrigeration system is in cooling mode, the first heat exchange path is connected to the cooling path, and the heat exchange medium flows from the first heat exchange path to the cooling path, where it is cooled down. When the refrigeration system switches to heating mode, the heat exchange medium flows from the second heat exchange path to the cooling path. Furthermore, since the cooling element is always located upstream of the expansion valve, the heat exchange medium, regardless of whether it flows from the first or second heat exchange path to the cooling path, will first pass through the cooling element. Therefore, the temperature is higher when passing through the cooling element, preventing condensation from forming on its surface and thus preventing damage to the component.

[0008] In one embodiment, the cooling flow path includes a first main path, a first branch path, and a second branch path. The first main path, the first branch path, and the second branch path are all connected to the first heat exchange flow path and the second heat exchange flow path. A first switching unit is provided on the first main path, a second switching unit is provided on the first branch path, and a third switching unit is provided on the second branch path. In the cooling mode, the first switching unit is turned on, and the second and third switching units are turned off. In the heating mode, the first switching unit is turned off, and the second and third switching units are turned on.

[0009] In one embodiment, the cooling element is connected to the expansion valve on the first main line. The first switching unit includes a first switching element and a second switching element. The first switching element is disposed at the end of the cooling element away from the expansion valve, and the second switching element is disposed at the end of the expansion valve away from the cooling element. The two ends of the first branch are respectively connected between the first switching element and the cooling element and between the second switching element and the expansion valve. The two ends of the second branch are respectively connected between the end of the first switching element away from the cooling element and between the expansion valve and the second switching element.

[0010] In one embodiment, the second switching unit includes a third switching element, and the third switching unit includes a fourth switching element.

[0011] In one embodiment, the first switch, the second switch, the third switch, and the fourth switch are all configured as one-way valves and / or solenoid valves.

[0012] In one embodiment, the cooling flow path includes a third branch and a fourth branch, which are connected in parallel. The third branch and the fourth branch are each provided with the cooling element and the expansion valve. The third branch and the fourth branch are connected to the first heat exchange flow path and the second heat exchange flow path respectively.

[0013] In one embodiment, the third branch is provided with a fifth switch, which is located at the end of the cooling element in the third branch away from the expansion valve, and the fourth branch is provided with a sixth switch, which is located at the end of the cooling element in the fourth branch away from the expansion valve.

[0014] In one embodiment, the cooling flow path includes a second main path, a fifth branch path, and a sixth branch path. The second main path, the fifth branch path, and the sixth branch path are all connected to the first heat exchange flow path and the second heat exchange flow path, and the fifth branch path and the sixth branch path are both connected in parallel with the second main path. The second main path is provided with the cooling element and two expansion valves located on both sides of the cooling element. The second main path is provided with a seventh switch and an eighth switch, which are located on the outer sides of the two expansion valves, away from each other. The fifth branch path is provided with a ninth switch, and the sixth branch path is provided with a tenth switch. The ninth switch and the tenth switch can be opened or closed according to the ambient temperature.

[0015] In one embodiment, the refrigeration system further includes a control device, wherein the compressor is connected to the four-way reversing valve, the four-way reversing valve is connected to the control device, and is configured to switch flow paths in response to an electrical signal from the control device.

[0016] In one embodiment, the first heat exchange path further includes a first heat exchanger, one end of which is connected to the four-way reversing valve and the other end of which is connected to the cooling path; the second heat exchange path includes a second heat exchanger, one end of which is connected to the four-way reversing valve and the other end of which is connected to the cooling path.

[0017] Compared to existing technologies, the refrigeration system provided by this utility model has opposite flow directions of the heat exchange medium in the cooling and heating modes. However, by setting the first branch, the second branch, and the switching components thereon, it is still possible to guide the heat exchange medium to pass through the cooling component first and then through the expansion valve. This avoids the problem of condensation on the cooling component after the medium passes through the expansion valve for throttling and cooling. Attached Figure Description

[0018] Figure 1 A schematic diagram of the refrigeration system provided in Embodiment 1 of this utility model;

[0019] Figure 2 A partial structural schematic diagram of the refrigeration system provided in Embodiment 2 of this utility model;

[0020] Figure 3 A partial structural schematic diagram of the refrigeration system provided in Embodiment 3 of this utility model.

[0021] The symbols in the diagram represent the following meanings:

[0022] 100. Refrigeration system; 10. First heat exchange path; 11. First heat exchanger; 20. Second heat exchange path; 21. Second heat exchanger; 30. Cooling path; 31. First main path; 311. First switch; 312. Second switch; 32. First branch; 321. Third switch; 33. Second branch; 331. Fourth switch; 34. Third branch; 341. Fifth switch; 35. Fourth branch; 351. Sixth switch; 36. Cooling component; 37. Expansion valve; 38. Second main path; 381. Seventh switch; 382. Eighth switch; 39. Fifth branch; 391. Ninth switch; 301. Sixth branch; 3011. Tenth switch; 40. Compressor; 50. Four-way reversing valve. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0028] Please see Figures 1-3 This utility model provides a refrigeration system 100, including a first heat exchange flow path 10, a second heat exchange flow path 20, a cooling flow path 30, a compressor 40, and a four-way reversing valve 50. One end of the first heat exchange flow path 10 and one end of the second heat exchange flow path 20 are connected to the four-way reversing valve 50, and the other end of the first heat exchange flow path 10 and the other end of the second heat exchange flow path 20 are connected to the cooling flow path 30. The inlet and outlet of the compressor 40 are connected to the four-way reversing valve 50. The refrigeration system has a cooling mode and a heating mode. The cooling flow path 30 is provided with a cooling element 36 and an expansion valve 37. In either the cooling mode or the heating mode, the cooling element 36 is located upstream of the expansion valve 37 along the direction of the heat exchange medium flow path of the refrigeration system.

[0029] Thus, the first heat exchange path 10 and the second heat exchange path 20 are connected in parallel, and the heat exchange medium flows in only one of the paths at the same time. When the refrigeration system 100 is in the refrigeration mode, the first heat exchange path 10 is connected to the cooling path 30, and the heat exchange medium flows from the first heat exchange path 10 to the cooling path 30 and completes the cooling in the cooling path 30. When the refrigeration system 100 switches to the heating mode, the heat exchange medium flows from the second heat exchange path 20 to the cooling path 30. Furthermore, since the cooling element 36 is always located upstream of the expansion valve 37 (that is, in front of the heat exchange medium flow path of the refrigeration system, the cooling element 36 is closer to the source of the heat exchange medium than the expansion valve 37), the heat exchange medium will pass through the cooling element 36 first, regardless of whether it flows from the first heat exchange flow path 10 or the second heat exchange flow path 20 to the cooling flow path 30. Therefore, the temperature is higher when passing through the cooling element 36, which avoids the formation of condensate on the surface of the cooling element 36, thereby preventing the condensate from damaging the component.

[0030] The refrigeration system 100 also includes a compressor 40, a four-way reversing valve 50, and a control device. The compressor 40 is connected to the four-way reversing valve 50, which is also connected to the control device and configured to switch flow paths in response to an electrical signal from the control device. The high-temperature, high-pressure heat exchange medium compressed by the compressor 40 enters the four-way reversing valve 50. The four-way reversing valve 50, according to the control signal from the control device, directs the heat exchange medium into either the first heat exchange flow path 10 or the second heat exchange flow path 20.

[0031] The first heat exchange path 10 also includes a first heat exchanger 11, one end of which is connected to a four-way reversing valve 50, and the other end of which is connected to a cooling path 30. The second heat exchange path 20 includes a second heat exchanger 21, one end of which is connected to the four-way reversing valve 50, and the other end of which is connected to the cooling path 30. When the heat exchange medium flows in the first heat exchange path 10, it exchanges heat with the external environment through the first heat exchanger 11, and in the second heat exchange path 20, it exchanges heat with the external environment through the second heat exchanger 21. In cooling mode, the first heat exchanger 11 acts as a condenser and the second heat exchanger 21 acts as an evaporator. The heat exchange medium is transported to the compressor 40 through the four-way reversing valve 50 to form a high-temperature, high-pressure gaseous state. Heat dissipation occurs in the first heat exchanger 11, and the heat exchange medium condenses into a liquid state. The gaseous state is then cooled by the cooling element 36 and flows through the expansion valve to form a low-temperature, low-pressure heat exchange medium. The low-temperature, low-pressure heat exchange medium absorbs heat and evaporates in the second heat exchanger, thus cooling the external environment. In heating mode, the first heat exchanger 11 acts as an evaporator and the second heat exchanger 21 acts as a condenser. The heat exchange medium is transported to the compressor 40 through the four-way reversing valve 50 to form a high-temperature, high-pressure gaseous state. Heat dissipation occurs in the second heat exchanger 21, thus heating the external environment. The heat exchange medium condenses into a liquid state and then cools the gaseous state through the cooling element 36. The gaseous state flows through the expansion valve 37 to form a low-temperature, low-pressure heat exchange medium. The low-temperature, low-pressure heat exchange medium absorbs heat and evaporates in the first heat exchanger 11.

[0032] Specifically, in Embodiment 1, the cooling flow path 30 includes a first main path 31, a first branch path 32, and a second branch path 33. The first main path 31, the first branch path 32, and the second branch path 33 are all connected to the first heat exchange flow path 10 and the second heat exchange flow path 20. A first switching unit is provided on the first main path 31, a second switching unit is provided on the first branch path 32, and a third switching unit is provided on the second branch path 33. In the cooling mode, the first switching unit is open, and the second and third switching units are closed. In the heating mode, the first switching unit is closed, and the second and third switching units are open. Thus, when the first switch unit is opened, the first main path 31 is connected to the first heat exchange flow path 10 and the second heat exchange flow path 20, and the heat exchange medium can flow on the first main path 31. When the first switch unit is closed and the second switch unit and the third switch unit are opened, the heat exchange medium can flow on the second branch path 33 and the third branch path 34. The flow direction of the heat exchange medium is guided by the second branch path 33 and the third branch path 34, so that the heat exchange medium always passes through the cooling element 36 first and then the expansion valve 37.

[0033] Furthermore, the cooling element 36 and the expansion valve 37 are connected to the first main circuit 31. The first switching unit includes a first switching element 311 and a second switching element 312. The first switching element 311 is located at the end of the cooling element 36 away from the expansion valve 37, and the second switching element 312 is located at the end of the expansion valve 37 away from the cooling element 36. The two ends of the first branch circuit 32 are respectively connected between the first switching element 311 and the cooling element 36, and between the second switching element 312 and the expansion valve 37. The two ends of the second branch circuit 33 are respectively connected between the end of the first switching element 311 away from the cooling element 36, and between the expansion valve 37 and the second switching element 312. Therefore, when the first switching unit is opened, that is, when the first switching element 311 and the second switching element 312 are in the open state, the heat exchange medium passes smoothly through the first switching element 311, the cooling element 36, the expansion valve 37, and the second switching element 312. When the refrigeration system 100 is in heating mode, the first switch 311 and the second switch 312 are closed. Since the first switch 311 is located upstream of the cooling element 36, and there is a connection port at one end of the first branch 32 between the first switch 311 and the cooling element 36, the heat exchange medium will flow from the first branch 32 into the cooling element 36 without passing through the first switch 311. The second switch 312 is located downstream of the expansion valve 37, and one end of the second branch 33 is connected between the expansion valve 37 and the second switch 312. Therefore, after passing through the expansion valve 37, the heat exchange medium will directly enter the second branch 33 without flowing to the second switch 312. In the second branch 33, the medium flows towards the first switch 311 and away from the cooling element 36. That is, the closure of the first switch 311 and the second switch 312 will not affect the flow of the heat exchange medium in the refrigeration system 100 in heating mode.

[0034] Therefore, please see Figure 1 In heating mode, the specific flow path is as follows: after adjustment by the four-way reversing valve 50, the heat exchange medium flows from the second heat exchange flow path 20 to the cooling flow path. Since the second switch valve is in the closed state, the second switch unit on the first branch 32 is in the open state. The heat exchange medium will enter the first branch 32 and go around to the upstream of the cooling element 36 through the first branch 32. Then it passes through the cooling element 36 and then through the expansion valve 37. In this process, the problem of condensation caused by passing through the expansion valve 37 for cooling and then passing through the cooling element 36 in the conventional flow path is avoided. After passing through the expansion valve 37, the heat exchange medium enters the second branch 33.

[0035] In this embodiment, the second switching unit includes a third switching element 321, and the third switching unit includes a fourth switching element 331. The first switching element 311, the second switching element 312, the third switching element 321, and the fourth switching element 331 are all configured as check valves and / or solenoid valves. Check valves have a simple structure and can prevent backflow of the heat exchange medium, while solenoid valves can be controlled by electrical signals to achieve the same valve-closing effect as check valves.

[0036] In other embodiments, the second switching unit may also include two third switching elements 321, and the third switching unit may also include two fourth switching elements 331, thereby improving the stability of the structure and ensuring that there will be no leakage of heat exchange medium after the valve is closed.

[0037] In Example 2, please refer to Figure 2 Alternatively, the cooling flow path 30 can be set not in the combination of the first main path 31, the first branch path 32 and the second branch path 33, but instead in the parallel connection of the third branch path 34 and the fourth branch path 35. The third branch path 34 and the fourth branch path 35 are connected in parallel, and both the third branch path 34 and the fourth branch path 35 are equipped with cooling components 36 and expansion valves 37. The third branch path 34 and the fourth branch path 35 are connected one-to-one with the first heat exchange flow path 10 and the second heat exchange flow path 20. The control device can switch the connection between the third branch path 34 and the first heat exchange flow path 10 or the fourth branch path 35 and the second heat exchange flow path 20 according to the ambient temperature. Thus, the control device determines whether the refrigeration system 100 is operating in refrigeration mode or heating mode based on the ambient temperature. When in refrigeration mode, the first heat exchange flow path 10 is connected to the third branch 34. When in heating mode, the second heat exchange flow path 20 is connected to the fourth branch 35. Both the third branch 34 and the fourth branch 35 are equipped with independent cooling components 36 and expansion valves 37, and the two branches will not affect each other.

[0038] Specifically, please see Figure 2Since the cooling element 36 is located upstream of the expansion valve 37, and the flow directions of the first heat exchange flow path 10 and the second heat exchange flow path 20 are opposite, the positions of the cooling element 36 and the expansion valve 37 in the third branch 34 are exactly opposite to those in the fourth branch 35.

[0039] Furthermore, a fifth switch 341 is provided in the third branch 34, located upstream of the cooling element 36 in the third branch 34. A sixth switch 351 is provided in the fourth branch 35, also located upstream of the cooling element 36 in the fourth branch 35. Thus, by controlling the fifth switch 341 and the sixth switch 351, the control device can connect the third branch 34 to the first heat exchange flow path 10, or the fourth branch 35 to the second heat exchange flow path 20.

[0040] In Example 3, please refer to Figure 3 The cooling flow path 30 includes a second main path 38, a fifth branch path 39, and a sixth branch path 301. The second main path 38, the fifth branch path 39, and the sixth branch path 301 are all connected to the first heat exchange flow path 10 and the second heat exchange flow path 20. The fifth branch path 39 and the sixth branch path 301 are connected in parallel with the second main path 38. The second main path 38 is provided with a cooling element 36 and two expansion valves 37 located upstream and downstream of the cooling element 36, respectively. The second main path 38 is provided with a seventh switch element 381 and an eighth switch element 382, ​​which are located on the outer sides of the two expansion valves 37, away from each other. The fifth branch path 39 is provided with a ninth switch element 391, and the sixth branch path 301 is provided with a tenth switch element 3011. The control device can switch one of the ninth switch element 391 and the tenth switch element 3011 to open or close according to the ambient temperature.

[0041] Thus, the control device can open the ninth switch 391 to connect the fifth branch 39 to the first heat exchange flow path 10. At this time, the medium flows directly through the fifth branch 39 to the cooling element 36, while the tenth switch 3011 on the sixth branch 301 is closed, preventing the heat exchange medium from passing through the sixth branch 301. Therefore, the medium continues to flow through the expansion valve 37 and the eighth switch 382. Conversely, the control device can switch to heating mode based on room temperature. In this mode, the tenth switch 3011 on the sixth branch 301 is opened, allowing the heat exchange medium to flow through the sixth branch 301 to the cooling element 36. Simultaneously, the ninth switch 391 on the fifth branch 39 is closed, and the heat exchange medium flows through the expansion valve 37 located on the cooling element 36 near the seventh switch 381.

[0042] This invention can acquire ambient temperature; based on the measured ambient temperature, it determines whether the refrigeration system 100 is set to refrigeration mode or heating mode; when the refrigeration system 100 is in refrigeration mode, the first switch 311 and the second switch 312 are turned on, and the third switch 321 and the fourth switch 331 are turned off; at this time, the first main circuit 31 is connected, and the heat exchange medium first passes through the cooling element 36 and then flows to the expansion valve 37, thus avoiding the generation of condensate on the cooling element 36.

[0043] When the refrigeration system 100 is in heating mode, the first switch 311 and the second switch 312 are turned off, and the third switch 321 and the fourth switch 331 are turned on. The heat exchange medium is redirected to the first branch 32 and the second branch 33, so that although the second heat exchange flow path 20 flows in the opposite direction, the heat exchange medium can still pass through the cooling element 36 first.

[0044] The control device (not shown) includes a memory and a processor. The memory is configured to store computer programs that, when executed by the processor, enable the computer programs to perform relevant operations.

[0045] Compared to existing technologies, the refrigeration system 100 provided by this utility model has the opposite flow direction of the heat exchange medium in the refrigeration mode and the heating mode. However, by setting the first branch 32, the second branch 33 and the switching components thereon, it is still possible to guide the heat exchange medium to pass through the cooling component 36 first and then through the expansion valve 37. This avoids the problem of condensation on the cooling component 36 after the medium is throttled and cooled by the expansion valve 37 first.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A refrigeration system, characterized in that, It includes a first heat exchange flow path (10), a second heat exchange flow path (20), a cooling flow path (30), a compressor (40), and a four-way reversing valve (50). One end of the first heat exchange flow path (10) and one end of the second heat exchange flow path (20) are connected to the four-way reversing valve (50). The other end of the first heat exchange flow path (10) and the other end of the second heat exchange flow path (20) are connected to the cooling flow path (30). The inlet and outlet of the compressor (40) are connected to the four-way reversing valve (50). The refrigeration system has a refrigeration mode and a heating mode. The cooling flow path (30) is provided with a cooling element (36) and an expansion valve (37). In the refrigeration mode or the heating mode, along the flow path of the heat exchange medium of the refrigeration system, the cooling element (36) is located upstream of the expansion valve (37).

2. The refrigeration system according to claim 1, characterized in that, The cooling flow path (30) includes a first main path (31), a first branch path (32), and a second branch path (33). The first main path (31), the first branch path (32), and the second branch path (33) are all connected to the first heat exchange flow path (10) and the second heat exchange flow path (20). A first switching unit is provided on the first main path (31), a second switching unit is provided on the first branch path (32), and a third switching unit is provided on the second branch path (33). In the cooling mode, the first switching unit is turned on, and the second and third switching units are turned off; In the heating mode, the first switch unit is off, and the second and third switch units are on.

3. The refrigeration system according to claim 2, characterized in that, The cooling component (36) and the expansion valve (37) are connected on the first main path (31). The first switching unit includes a first switching component (311) and a second switching component (312). The first switching component (311) is located at the end of the cooling component (36) away from the expansion valve (37). The second switching component (312) is located at the end of the expansion valve (37) away from the cooling component (36). The two ends of the first branch path (32) are respectively connected between the first switching component (311) and the cooling component (36) and between the second switching component (312) and the expansion valve (37). The two ends of the second branch path (33) are respectively connected between the end of the first switching component (311) away from the cooling component (36) and between the expansion valve (37) and the second switching component (312).

4. The refrigeration system according to claim 3, characterized in that, The second switching unit includes a third switching element (321), and the third switching unit includes a fourth switching element (331).

5. The refrigeration system according to claim 4, characterized in that, The first switch (311), the second switch (312), the third switch (321) and the fourth switch (331) are all configured as one-way valves and / or solenoid valves.

6. The refrigeration system according to claim 1, characterized in that, The cooling flow path (30) includes a third branch (34) and a fourth branch (35), which are connected in parallel. The third branch (34) and the fourth branch (35) are each provided with a cooling component (36) and an expansion valve (37). The third branch (34) and the fourth branch (35) are connected to the first heat exchange flow path (10) and the second heat exchange flow path (20) in a one-to-one correspondence.

7. The refrigeration system according to claim 6, characterized in that, The third branch (34) is provided with a fifth switch (341), which is located at the end of the cooling component (36) in the third branch (34) away from the expansion valve (37). The fourth branch (35) is provided with a sixth switch (351), which is located at the end of the cooling component (36) in the fourth branch (35) away from the expansion valve (37).

8. The refrigeration system according to claim 1, characterized in that, The cooling flow path (30) includes a second main path (38), a fifth branch path (39), and a sixth branch path (301). The second main path (38), the fifth branch path (39), and the sixth branch path (301) are all connected to the first heat exchange flow path (10) and the second heat exchange flow path (20), and the fifth branch path (39) and the sixth branch path (301) are both connected in parallel with the second main path (38). The cooling element (36) and two cooling components located on both sides of the cooling element (36) are provided on the second main path (38). The expansion valve (37) is provided with a seventh switch (381) and an eighth switch (382) on the second main line (38), the seventh switch (381) and the eighth switch (382) are provided on the outer side of the two expansion valves (37) away from each other, the fifth branch line (39) is provided with a ninth switch (391), and the sixth branch line (301) is provided with a tenth switch (3011); the ninth switch (391) and the tenth switch (3011) can be opened or closed according to the ambient temperature.

9. The refrigeration system according to claim 1, characterized in that, The refrigeration system also includes a control device, wherein the compressor (40) is connected to the four-way reversing valve (50), the four-way reversing valve (50) is connected to the control device, and is configured to switch flow paths in response to an electrical signal from the control device.

10. The refrigeration system according to claim 9, characterized in that, The first heat exchange flow path (10) further includes a first heat exchanger (11), one end of which is connected to the four-way reversing valve (50), and the other end is connected to the cooling flow path (30); The second heat exchange path (20) includes a second heat exchanger (21), one end of which is connected to the four-way reversing valve (50), and the other end is connected to the cooling path (30).

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