Refrigerator

Abstract

The embodiment of the invention provides a refrigerator, and relates to the technical field of refrigeration. The refrigerating machine comprises a machine shell assembly, a compression piston, an expansion piston and a cooler, the compression piston and the expansion piston are both arranged in the machine shell assembly, the machine shell assembly is provided with a first cavity, the first cavity is located between the compression piston and the expansion piston, and the cooler is arranged in the first cavity. The refrigerating efficiency of the refrigerator is improved.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and more particularly to a refrigeration machine. Background Technology

[0002] A refrigeration machine is a device used to cool equipment. In existing technology, refrigeration machines typically use a compression piston to compress the working fluid and an expansion piston to expand it, thereby transferring heat during the cycle to cool the equipment. However, in the refrigeration cycle using the compression and expansion pistons, the refrigeration machine still suffers from low efficiency, affecting both the cooling effect and the energy utilization efficiency of the refrigeration machine. Summary of the Invention

[0003] This application provides a refrigerator for improving the refrigeration efficiency of the refrigerator. The refrigerator includes a housing assembly, a compression piston, an expansion piston, and a cooler. The compression piston and the expansion piston are both disposed within the housing assembly. The housing assembly has a first cavity located between the compression piston and the expansion piston. The cooler is disposed within the first cavity.

[0004] As can be seen from the refrigerator provided in the first aspect above, since the first chamber of the refrigerator is located between the compression piston and the expansion piston, the temperature of the working medium in the first chamber will rise during the compression process of the compression piston. The cooler located in the first chamber can cool the working medium in the first chamber, thereby reducing the temperature of the working medium in the first chamber, reducing the temperature rise caused by the compression piston compressing the working medium, and avoiding the temperature rise of the working medium in the first chamber.

[0005] This reduces the adverse effects of the higher-temperature working fluid in the first cavity flowing through the connecting channel to the expansion cavity on the cooling effect within the expansion cavity, thereby helping to maintain a lower temperature within the expansion cavity, improving the cooling effect of the expansion cavity, and ultimately enhancing the refrigeration efficiency of the refrigerator.

[0006] Furthermore, due to the cooler, even if the compression piston has a small impact on the working fluid in the first chamber, the cooler can reduce the temperature of the working fluid entering the expansion piston by lowering the temperature of the first chamber.

[0007] In conjunction with the first implementation of the first aspect, the housing assembly includes a compressor housing assembly and an expander housing assembly, with a compression piston disposed within the compressor housing assembly and an expansion piston disposed within the expander housing assembly, and the first cavity being a chamber within the compressor housing assembly and / or a chamber within the expander housing assembly.

[0008] As can be seen from the first implementation method described above, since the first cavity can be located within the compressor housing assembly, the expander housing assembly, or both, the location of the first cavity is more flexible. The appropriate formation method can be selected based on the specific arrangement of the compressor and expander within the refrigeration unit, thus facilitating adaptation to different refrigeration unit structural design requirements. Furthermore, by modifying the existing compressor housing assembly and / or expander housing assembly of the refrigeration unit to form the first cavity, the first cavity can be structurally closer to the compressor or expander, which is beneficial for the integrated arrangement of related components, the miniaturization of the refrigeration unit, and reducing the overall structural complexity of the refrigeration unit.

[0009] In conjunction with the second implementation of the first aspect, the housing assembly includes a compressor housing assembly, the compressor housing assembly includes a compression chamber, the compression chamber is connected to the expander housing assembly, the first cavity includes the compression chamber, and at least a portion of the cooler is disposed within the compression chamber.

[0010] As can be seen from the second implementation method above, when the cooler is set in the compression chamber, when the compression piston compresses the working medium, the heat of compression generated by the working medium in the compression chamber can be carried away by the cooler more quickly, thereby reducing the temperature of the working medium in the compression chamber and reducing the temperature rise caused by the compression piston compressing the working medium.

[0011] In conjunction with the third implementation of the first aspect, the cooler is disposed in the compression chamber, the compression chamber including a first wall surface of the compression piston facing the compression chamber, a second wall surface opposite to the first wall surface, and a first peripheral wall disposed on the first wall surface and the second wall surface; at least a portion of the cooler is disposed on the first peripheral wall; and / or, at least a portion of the cooler is disposed on the second wall surface; and / or, at least a portion of the cooler is disposed on the first wall surface.

[0012] As can be seen from the third implementation method above, when the cooler is set on the first circumferential wall, it is beneficial to exchange heat with the working fluid in the cavity along the circumference of the compression cavity, reduce the temperature accumulation of the working fluid in the circumferential region during the compression process, and reduce the impact of heat transfer from the compression cavity circumferential wall to the outside or from the wall to the working fluid; when the cooler is set on the second wall, it can exchange heat with the working fluid near the compression end region or the end region of the working fluid flow path, reduce the adverse effects of local temperature rise in this region on the subsequent working fluid flow and connection; when the cooler is set on the first wall, it can cool the working fluid and the wall near the compression piston, weaken the near-end heat accumulation caused by the reciprocating compression of the compression piston.

[0013] By placing the cooler in one or more of the above locations, different areas can be cooled according to the temperature distribution characteristics in the compression chamber, thereby reducing the overall temperature of the working fluid in the compression chamber, reducing the impact of the high-temperature working fluid transferring heat to the subsequent flow channel and expansion side, which is beneficial to maintaining the low-temperature environment in the refrigeration cycle and improving the refrigeration efficiency of the refrigeration machine.

[0014] In conjunction with the fourth implementation of the first aspect, the expander housing assembly includes a transition cavity communicating with the compression cavity, and the first cavity also includes the transition cavity; the cooler includes a first cooling unit and a second cooling unit, the first cooling unit being disposed in the compression cavity and the second cooling unit being disposed in the transition cavity.

[0015] As can be seen from the fourth implementation method above, when the compression piston compresses the working fluid, the first cooling unit can cool the working fluid in the compression chamber that has a temperature rise due to compression, reducing the heat accumulation at the compression end and the impact of the high-temperature working fluid being transferred to the subsequent flow path; the second cooling unit is set in the transition chamber, which can cool the working fluid in the transition chamber and its surrounding area, which is conducive to a lower temperature environment at the inlet of the expansion chamber and improves the cooling efficiency of the refrigerator.

[0016] By setting cooling units in the compression chamber and the transition chamber respectively, heat exchange of the working fluid can be carried out in different stages of the refrigeration cycle, which is beneficial to improve the refrigeration capacity during the expansion process and improve the cooling effect and energy utilization efficiency of the refrigeration machine.

[0017] In conjunction with the fifth implementation of the first aspect, the compression chamber includes a first wall surface of the compression piston facing the compression chamber, a second wall surface opposite to the first wall surface, and a first peripheral wall disposed on the first wall surface and the second wall surface; at least a portion of the first cooling unit is disposed on the first peripheral wall; and / or, at least a portion of the first cooling unit is disposed on the second wall surface; and / or, at least a portion of the first cooling unit is disposed on the first wall surface.

[0018] As can be seen from the sixth implementation method above, when the first cooling unit is set on the first peripheral wall, it is beneficial to cool the working fluid along the circumference of the compression chamber, reduce the heat accumulation of the working fluid in the circumferential region during the compression process, and reduce the impact of the peripheral wall temperature rise on the working fluid temperature in the chamber; when the first cooling unit is set on the second wall, it is beneficial to cool the working fluid and the corresponding wall surface in the area of ​​the compression chamber away from the compression piston, reduce the adverse effects of the local high temperature in this area on the subsequent flow and heat transfer of the working fluid; when the first cooling unit is set on the first wall, it is beneficial to cool the working fluid and the wall surface near the compression piston, and reduce the near-end temperature rise caused by the reciprocating compression of the compression piston.

[0019] By placing the first cooling unit at one or more of the above-mentioned locations, different areas can be cooled according to the heat distribution in the compression chamber, thereby reducing the overall temperature of the working fluid in the compression chamber, reducing the impact of heat transfer from the compression end to the subsequent flow channel, transition chamber or expansion side, which is beneficial to maintaining the lower temperature conditions required for the subsequent expansion process, and thus improving the refrigeration efficiency of the refrigerator.

[0020] In conjunction with the sixth implementation of the first aspect, the transition cavity includes a third wall surface of the expansion piston facing the transition cavity, a fourth wall surface opposite to the third wall surface, and a second peripheral wall disposed on the third wall surface and the fourth wall surface; at least a portion of the second cooling unit is disposed on the second peripheral wall surface; and / or, at least a portion of the second cooling unit is disposed on the fourth wall surface; and / or, at least a portion of the second cooling unit is disposed on the third wall surface.

[0021] As can be seen from the sixth implementation method above, when the second cooling unit is set on the second peripheral wall, it is beneficial to cool the working fluid flowing through the transition cavity along the circumference, reducing the heat accumulation and uneven temperature distribution in the circumferential region; when the second cooling unit is set on the fourth wall, it is beneficial to cool the working fluid and wall surface in the area of ​​the transition cavity away from the expansion piston, reducing the influence of heat transfer from this area to the interior of the transition cavity; when the second cooling unit is set on the third wall, it is beneficial to cool the working fluid and wall surface near the expansion piston, thereby reducing the temperature of the corresponding area of ​​the expansion piston facing the transition cavity, reducing the adverse effects of heat transfer from this side to the expansion process.

[0022] By placing the second cooling unit in one or more of the above locations, different areas can be cooled according to the heat distribution in the transition cavity, thereby reducing the temperature of the working fluid that participates in the subsequent flow and expansion process through the transition cavity. This helps to maintain a lower temperature on the expansion side, thereby improving the cooling effect and energy utilization efficiency of the refrigerator.

[0023] In conjunction with the seventh implementation of the first aspect, the housing assembly includes an expansion housing assembly, which includes a transition cavity and an expansion cavity. The transition cavity is connected to the compressor housing assembly. The expansion cavity and the transition cavity are located on both sides of the expansion piston. The expansion piston is provided with a connecting flow channel and a regenerator. The connecting flow channel connects the transition cavity and the expansion cavity. The first cavity includes the transition cavity, and the cooler is located inside the transition cavity.

[0024] As can be seen from the seventh implementation method above, placing the cooler in the transition cavity can pre-cool the working fluid entering the transition cavity from the compressor housing assembly, thereby helping to reduce the temperature of the working fluid entering the expansion cavity, improve the expansion and cooling effect of the working fluid in the expansion cavity, and thus improve the cooling efficiency of the refrigerator.

[0025] In conjunction with the eighth implementation of the first aspect, the housing assembly includes a compressor housing assembly and an expander housing assembly. The housing assembly is also provided with a connecting channel that connects the compressor housing assembly and the expander housing assembly. The first cavity includes the connecting channel, and the cooler is disposed in the connecting channel.

[0026] As can be seen from the eighth implementation method above, placing the cooler in the connecting channel can cool the working fluid flowing between the compressor housing assembly and the expander housing assembly, thereby helping to reduce the temperature of the working fluid entering the expander housing assembly and improve the cooling efficiency of the refrigerator.

[0027] In conjunction with the ninth implementation of the first aspect, the wall of the first cavity includes a portion of the housing assembly, a cooler is disposed on the inner wall of a portion of the housing assembly, and a heat dissipation structure is provided on the surface of the portion of the housing assembly facing away from the cooler.

[0028] As can be seen from the ninth implementation method above, the cooler can exchange heat between the working fluid in the first cavity and the adjacent inner wall surface. This part of the housing assembly can serve as a heat transfer part to conduct heat to the outside. The heat dissipation structure set on the outer surface is conducive to further dissipating the heat conducted to the outside, thereby reducing the accumulation of heat on the housing wall and lowering the temperature level of the corresponding wall surface.

[0029] In conjunction with the tenth implementation method of the first aspect, the heat dissipation structure includes heat dissipation fins.

[0030] As can be seen from the tenth implementation method above, this can increase the heat dissipation area between the first part of the casing assembly and the external environment, and improve the heat exchange capacity of this part to the outside.

[0031] In conjunction with the eleventh implementation of the first aspect, the wall of the first cavity includes a portion of the housing assembly, a portion of which has an opening, a cooler is disposed within the opening, and the surface of the cooler facing the first cavity forms the wall of the first cavity.

[0032] As can be seen from the eleventh implementation method above, the cooler can directly form part of the boundary of the first cavity, thereby shortening the heat transfer path between the cooler and the working fluid in the first cavity, reducing the obstruction of the intermediate structure to the heat exchange process, and improving the heat exchange effect of the cooler on the working fluid in the first cavity.

[0033] In conjunction with the twelfth implementation of the first aspect, the cooler includes a thermoelectric cooler with the cold end of the thermoelectric cooler facing the first cavity.

[0034] As can be seen from the twelfth implementation method described above, the refrigerator can directly cool the working fluid and adjacent areas in the first cavity using the cold end of the thermoelectric cooler. This reduces the temperature level of the working fluid in the first cavity, minimizes the temperature rise caused by the compression process, inhibits heat accumulation in the first cavity, and weakens the adverse effects of the temperature rise on the first cavity wall on the working fluid temperature.

[0035] In conjunction with the thirteenth implementation of the first aspect, the refrigerator also includes a temperature sensor and a controller. The temperature sensor is used to detect the temperature of the working fluid in the first cavity, and the controller is connected to the temperature sensor and the cooler, and is used to control and adjust the power of the cooler according to the working fluid temperature detected by the temperature sensor.

[0036] As can be seen from the thirteenth implementation method described above, the refrigerator can acquire the temperature state of the working fluid in the first chamber in real time and adjust the working power of the cooler accordingly, so that the cooling capacity of the cooler is adapted to the actual temperature change of the working fluid in the first chamber. When the temperature of the working fluid in the first chamber rises, the power of the cooler can be increased to enhance the cooling effect and reduce the adverse effects of the compression process or heat accumulation on the working fluid temperature; when the temperature of the working fluid in the first chamber is low or the temperature change is small, the power of the cooler can be reduced to avoid unnecessary energy consumption.

[0037] This helps to maintain the temperature of the working fluid in the first chamber within a suitable range, reduces the impact of heat transfer from the higher-temperature working fluid to the subsequent flow path and expansion side, and improves the rationality of energy utilization in the operation of the cooler, thereby improving the cooling effect and overall refrigeration efficiency of the refrigerator. Attached Figure Description

[0038] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0039] Figure 1 This is a schematic diagram of a split-type refrigeration unit provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an integrated refrigeration unit provided in an embodiment of this application; Figure 3 The cooler provided in the embodiments of this application is Figure 1 A schematic diagram of the first method of refrigeration unit setup; Figure 4 The cooler provided in the embodiments of this application is Figure 1 A schematic diagram of the second method of refrigeration unit installation; Figure 5 The cooler provided in the embodiments of this application is Figure 1A schematic diagram of the third method of refrigeration unit configuration; Figure 6 for Figure 1 A schematic diagram of the heat dissipation structure of the refrigerator provided in the embodiments of this application; Figure 7 for Figure 4 A schematic diagram of the installation structure of the cooler provided in the embodiments of this application.

[0040] Figure label: 100 - Refrigeration unit; 101 - Housing assembly; 101a - Opening; 1011 - Compressor housing assembly; 1011a - Compression chamber; 1011b - First peripheral wall; 1011c - Second wall; 1012 - Expansion housing assembly; 1012a - Transition chamber; 1012b - Expansion chamber; 1012c - Fourth wall; 1012d - Second peripheral wall; Q - First cavity; 102 - Compression piston; 1021 - First wall; 103 - Expansion piston; 1031 - Third wall; 104 - Cooler; 1041 - First cooling unit; 1042 - Second cooling unit; 105 - Heat dissipation structure; 1051 - Heat dissipation fins; 106 - Temperature sensor; 107 - Connecting structure; 108 - First elastic element; 109 - Second elastic element. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0044] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0045] Please see Figure 1 First, the structure of the refrigeration unit 100 involved in the embodiments of this application will be described. To facilitate understanding of the technical solution of this application, the working principle of the refrigeration unit 100 will be described below using a Stirling refrigeration unit 100 as an example. It should be understood that the technical solution of this application is not limited to the Stirling refrigeration unit 100, and can also be applied to other refrigeration units with the same or similar working principles.

[0046] In some embodiments, see Figure 1 This application provides a refrigerator 100, which includes a housing assembly 101, a compression piston 102, an expansion piston 103, and a cooler 104. The compression piston 102 and the expansion piston 103 are both disposed inside the housing assembly 101. The housing assembly 101 is provided with a first cavity Q, which is located between the compression piston 102 and the expansion piston 103. The cooler 104 is disposed in the first cavity Q.

[0047] The compression piston 102 and the expansion piston 103 move in coordination to circulate the working fluid between the first cavity Q and the expansion cavity 1012b, thereby achieving heat transfer. Specifically, when the compression piston 102 moves toward the first cavity Q, the working fluid in the first cavity Q is compressed, the working fluid pressure increases, and it pushes the expansion piston 103 to move.

[0048] In some embodiments, housing assembly 101 includes compressor housing assembly 1011 and expander housing assembly 1012, compression piston 102 is disposed in compressor housing assembly 1011, expansion piston 103 is disposed in expander housing assembly 1012, and the first chamber is a chamber in compressor housing assembly 1011 and / or a chamber in expander housing assembly 1012.

[0049] For example, the housing assembly 101 can be configured as separate units, that is, the housing assembly 101 includes a compressor housing assembly 1011 and an expander housing assembly 1012, which are independently configured. The compression piston 102 is disposed within the compressor housing assembly 1011, forming an internal space corresponding to the compression process together with the compressor housing assembly 1011. The expansion piston 103 is disposed within the expander housing assembly 1012, forming an internal space corresponding to the expansion process together with the expander housing assembly 1012. In this way, the compression piston 102 and the expansion piston 103 are respectively disposed within different housing structures and can move within their respective housing assemblies 101.

[0050] It should be understood that the first chamber Q is a chamber within the compressor housing assembly 1011 and / or within the expander housing assembly 1012. This means that the first chamber Q can be located within the compressor housing assembly 1011, or within the expander housing assembly 1012, or both. In other words, the first chamber Q is not limited to being formed within only one housing assembly 101, but can be configured according to the specific arrangement, spatial structure, and system requirements of the compressor housing assembly 1011 and the expander housing assembly 1012.

[0051] For example, the expander housing assembly 1012 includes a transition cavity 1012a communicating with the compression cavity 1011a, and the first cavity Q also includes the transition cavity 1012a. The compressor housing assembly 1011 includes the compression cavity 1011a, which communicates with the expander housing assembly 1012, and the first cavity Q includes the compression cavity 1011a. The first cavity Q may include the communicating compression cavity 1011a and the transition cavity 1012a; that is, the compression cavity 1011a is a chamber within the compressor housing assembly 1011, and the transition cavity 1012a is a chamber within the expander housing assembly 1012.

[0052] The housing assembly 101 is also provided with an expansion chamber 1012b. The expansion chamber 1012b and the transition chamber 1012a are located on both sides of the expansion piston 103. The expansion piston 103 is provided with a connecting channel and a regenerator. The connecting channel connects the transition chamber 1012a and the expansion chamber 1012b.

[0053] The regenerator recovers both heat and cold. During the expansion and compression of the Stirling refrigerator cycle, the working fluid (such as helium) flows back and forth between the cold and hot ends. The regenerator stores the heat released by the working fluid as it flows from the hot end to the cold end through its internal high specific heat capacity packing (such as wire mesh or porous material), and returns the stored heat to the working fluid when it flows in the reverse direction.

[0054] The compression piston 102 and expansion piston 103 work together to circulate the working fluid between the first cavity Q and the expansion cavity 1012b, thereby achieving heat transfer. Specifically, when the compression piston 102 moves toward the compression cavity 1011a of the first cavity Q, the working fluid in the compression cavity 1011a is compressed and moves to the transition cavity 1012a. The pressure of the working fluid in the transition cavity 1012a increases, pushing the expansion piston 103 to move. During this process, part of the working fluid flows to the expansion cavity 1012b through the connecting channel. Since the working fluid passes through the regenerator during its flow, the regenerator can perform heat exchange on the working fluid flowing through the connecting channel to recover some of the heat carried by the working fluid.

[0055] When the working fluid enters the expansion chamber 1012b, it expands and its temperature decreases, creating a lower temperature region on one side of the expansion chamber 1012b to achieve refrigeration. Subsequently, as the compression piston 102 and expansion piston 103 continue to move in coordination, the working fluid in the expansion chamber 1012b can flow back to the first chamber Q through the connecting channel. During the recirculation process, the working fluid passes through the regenerator again, which can release the previously recovered heat to the returning working fluid or continue to exchange heat with the flowing working fluid, thereby reducing the heat loss of the working fluid during the circulation process.

[0056] Thus, the working fluid flows back and forth between the first cavity Q and the expansion cavity 1012b, absorbing and releasing heat during the compression, flow, and expansion processes, thereby transferring heat away from the side requiring cooling to achieve the refrigeration effect of the refrigerator 100. Simultaneously, the regenerator recovers heat from the working fluid flowing through the connecting channel, which helps improve the energy utilization efficiency of the refrigeration cycle.

[0057] It should be noted that, please refer to Figure 1 and Figure 2 This application does not limit the specific structure of the housing assembly 101. For ease of explanation, two exemplary structures of the housing assembly 101 are described below with reference to the accompanying drawings.

[0058] Please see Figure 1 , Figure 1 In the refrigeration unit 100 shown, the housing assembly 101 adopts a split structure, with the compressor housing assembly 1011 and the expander housing assembly 1012 arranged at intervals. In this case, the compressor housing assembly 1011 and the expander housing assembly 1012 can each form an independent structural unit and be connected by corresponding connection structures.

[0059] Please see Figure 2 , Figure 2In the refrigeration unit 100 shown, the housing assembly 101 adopts an integral structure, and the compressor housing assembly 1011 and the expander housing assembly 1012 are integrally set and assembled together to form the same device. At this time, the compressor housing assembly 1011 and the expander housing assembly 1012 can form an integrated structure.

[0060] In some embodiments, see Figure 1 and combined Figure 3 The refrigerator 100 also includes a cooler 104, which is located in the first cavity Q.

[0061] It should be noted that this application does not limit the specific type and structure of the cooler 104, nor does it limit its specific location within the first cavity Q, as long as it can cool the working fluid within the first cavity Q and / or the corresponding area of ​​the first cavity Q.

[0062] For example, the cooler 104 may be disposed in the compression chamber 1011a, or in the transition chamber 1012a, or in the communication area between the compression chamber 1011a and the transition chamber 1012a in the housing assembly 101.

[0063] Since the first chamber Q is located between the compression piston 102 and the expansion piston 103, the working medium in the first chamber Q will generate a temperature rise during the compression process of the compression piston 102. The cooler 104 can cool the working medium in the first chamber Q after the temperature rise, reduce the temperature rise caused by the compression process, and reduce the adverse effect of the compression process of the compression piston 102 on the subsequent refrigeration cycle.

[0064] Meanwhile, by integrating the cooler 104 into the housing assembly 101, this application can also reduce the temperature of the corresponding area (compression chamber 1011a and transition chamber 1012a) on the side of the expansion piston 103 away from the expansion chamber 1012b, weaken the influence of heat transfer from this area to the expansion process, thereby helping to maintain a lower temperature environment on the expansion side and improve the cooling effect of the refrigerator 100.

[0065] In some embodiments, see Figure 1 and combined Figure 3 The housing assembly 101 includes a compressor housing assembly 1011 and an expander housing assembly 1012. The refrigerator also includes a connecting structure 107. The compressor housing assembly 1011 has a compression chamber 1011a, and the expander housing assembly 1012 has a transition chamber 1012a. The compression chamber 1011a and the transition chamber 1012a are connected by the connecting structure 107, thereby allowing the working fluid to flow between the compression side and the expansion side. The compression piston 102 can be disposed in the compression chamber 1011a to compress the working fluid in the compression chamber 1011a.

[0066] At least a portion of the cooler 104 is located within the compression chamber 1011a.

[0067] It is understood that the connecting structure 107 is an external component of the housing assembly 101. For example, the connecting structure 107 can be a pipeline structure, a channel structure, or a connecting structure 107 composed of multiple connecting components. This embodiment does not limit this, as long as fluid communication between the compression chamber 1011a and the transition chamber 1012a can be achieved.

[0068] The compressor housing assembly 1011 and the expander housing assembly 1012 can be installed as a whole or as separate units connected by a connecting structure 107. This embodiment does not limit this.

[0069] It should be noted that there are multiple ways to implement the cooler 104 within the compression chamber 1011a. For example, the cooler 104 can be entirely disposed within the compression chamber 1011a, so that the entire cooler 104 is located within the compression space defined by the compressor housing assembly 1011. Alternatively, the cooler 104 can be partially disposed within the compression chamber 1011a, meaning that a portion of the cooler 104 is located within the compression chamber 1011a, while the other portion can be located on the wall of the compressor housing assembly 1011, at an adjacent structure communicating with the compression chamber 1011a, at the communicating structure 107, or in other areas of the housing assembly 101. This embodiment does not limit this, as long as the portion located within the compression chamber 1011a can cool the working fluid within the compression chamber 1011a. In other words, the arrangement of the cooler 104 can be selected based on the specific structure of the housing assembly 101, the spatial arrangement within the compression chamber 1011a, and the heat exchange requirements.

[0070] When the refrigerator 100 is working, the compression piston 102 moves within the compression chamber 1011a and compresses the working fluid, causing the temperature of the working fluid to rise during compression. Since at least a portion of the cooler 104 is located within the compression chamber 1011a, the cooler 104 can directly exchange heat and cool the working fluid within the compression chamber 1011a, and can also regulate the wall temperature of the corresponding area of ​​the compression chamber 1011a, thereby reducing the impact of temperature rise caused by the compression process.

[0071] The cooled working fluid can flow to the transition cavity 1012a through the connecting structure 107. Since the temperature of the working fluid entering the connecting structure 107 is reduced, it helps to reduce the influence of the higher temperature on the compression side on the expansion side, and thus helps to maintain a lower temperature environment on the inlet side of the expansion cavity 1012b.

[0072] In some embodiments, see Figure 3The cooler 104 is disposed in the compression chamber 1011a. The compression chamber 1011a includes a first wall surface 1021 of the compression piston 102 facing the compression chamber 1011a, a second wall surface 1011c opposite to the first wall surface 1021, and a first peripheral wall 1011b disposed on the first wall surface 1021 and the second wall surface 1011c.

[0073] The first wall surface 1021 and the second wall surface 1011c together constitute the two end walls of the compression chamber 1011a in the direction of movement of the compression piston 102. The compression piston 102 itself has one side facing the interior of the compression chamber 1011a, used to act on the working fluid within the compression chamber 1011a; this side can be called the compression side of the compression piston 102. The end wall surface opposite this compression side within the compression chamber 1011a is the "first wall surface 1021".

[0074] It should be noted that the specific type, structure, installation method, and specific location of the cooler 104 in the embodiments of this application are not limited, as long as it can be installed in the compression chamber 1011a and cool the working fluid in the compression chamber 1011a.

[0075] In this embodiment, the cooler 104 is integrally disposed within the compression chamber 1011a, and is either integrally formed with or configured in conjunction with the corresponding structure of the compression chamber 1011a. By disposing the cooler 104 within the compression chamber 1011a, the working fluid that heats up during the compression process of the compression piston 102 can be cooled, reducing the temperature rise caused by the compression process and mitigating the adverse effects of heat transfer from the compression side to subsequent flow paths.

[0076] In some embodiments, see Figure 3 and combined Figure 4 At least a portion of the cooler 104 is disposed on the first peripheral wall 1011b.

[0077] It should be noted that the specific manner in which the cooler 104 is disposed on the first peripheral wall 1011b is not limited in the embodiments of this application.

[0078] For example, the cooler 104 can be embedded in the first peripheral wall 1011b, attached to the side of the first peripheral wall 1011b facing the compression chamber 1011a, or formed in a local area of ​​the first peripheral wall 1011b or extended along the first peripheral wall 1011b; the part of the cooler 104 provided in the first peripheral wall 1011b can be a single-segment structure or a multi-segment structure distributed circumferentially.

[0079] By disposing at least a portion of the cooler 104 on the first circumferential wall 1011b, heat exchange cooling can be performed on the working fluid and the corresponding wall surface in the circumferential region of the compression chamber 1011a, reducing the heat accumulation of the working fluid in the circumferential region and reducing the impact of the temperature rise of the first circumferential wall 1011b on the temperature of the working fluid in the compression chamber 1011a.

[0080] In some embodiments, see Figure 3 At least a portion of the cooler 104 is disposed on the second wall surface 1011c.

[0081] It should be noted that the embodiments of this application do not limit the specific arrangement and coverage of the cooler 104 on the second wall surface 1011c.

[0082] For example, the cooler 104 may be disposed in the middle region of the second wall 1011c, or in the edge region of the second wall 1011c, or extended along at least a portion of the area of ​​the second wall 1011c; the cooler 104 may be entirely located in the corresponding region of the second wall 1011c, or only partially located in the corresponding region of the second wall 1011c.

[0083] By providing at least a portion of the cooler 104 on the second wall 1011c, the working fluid and the corresponding wall on the side of the compression chamber 1011a away from the compression piston 102 can be cooled, reducing the local temperature rise in this area and reducing the impact of heat transfer to the subsequent flow path.

[0084] In some embodiments, see Figure 3 At least a portion of the cooler 104 is disposed on the first wall surface 1021.

[0085] For example, the first wall surface 1021 may be provided with a mounting groove, a receiving groove, or an opening 101a, and at least a portion of the cooler 104 is embedded in the mounting groove, receiving groove, or opening 101a, thereby forming an assembly relationship between the cooler 104 and the first wall surface 1021. In another example, the cooler 104 may also be integrally formed with the first wall surface 1021, so that the side of the cooler 104 facing the compression chamber 1011a directly constitutes at least a portion of the wall structure of the first wall surface 1021.

[0086] It should be noted that the embodiments of this application do not limit the specific location, installation form and size range of the cooler 104 on the first wall surface 1021.

[0087] For example, the cooler 104 may be disposed in a local area of ​​the first wall 1021 or may cover at least a portion of the first wall 1021; it may be disposed separately from the first wall 1021 or may be integrally formed with the first wall 1021.

[0088] By providing at least a portion of the cooler 104 on the first wall 1021, heat exchange cooling can be performed on the working fluid and the corresponding wall near the compression piston 102, thereby reducing the temperature rise in the near-end region caused by the reciprocating compression of the compression piston 102.

[0089] It should be noted that the above-mentioned configurations of cooler 104 being located in compression chamber 1011a, at least part of cooler 104 being located on the first peripheral wall 1011b, at least part of cooler 104 being located on the second wall surface 1011c, and at least part of cooler 104 being located on the first wall surface 1021 can be configured individually, or two, three, or all of them can be configured simultaneously. This application does not limit this configuration.

[0090] By arranging the cooler 104 at at least one location on different walls according to the spatial structure and temperature distribution within the compression chamber 1011a, targeted cooling can be performed on different areas within the compression chamber 1011a, thereby reducing the temperature rise caused by the compression process and helping to reduce the adverse effects of the compression side on the subsequent cooling process.

[0091] In some embodiments, see Figure 1 The cooler 104 includes a first cooling unit 1041 and a second cooling unit 1042. The first cooling unit 1041 is located in the compression chamber 1011a, and the second cooling unit 1042 is located in the transition chamber 1012a.

[0092] It should be noted that the specific type, structure, size, installation method, and specific location of the first cooling unit 1041 and the second cooling unit 1042 in the corresponding cavity are not limited, as long as the first cooling unit 1041 can cool the working fluid in the compression cavity 1011a and / or the corresponding area of ​​the compression cavity 1011a, and the second cooling unit 1042 can cool the working fluid in the transition cavity 1012a and / or the corresponding area of ​​the transition cavity 1012a.

[0093] For example, the first cooling unit 1041 and the second cooling unit 1042 may employ the same cooling structure or different cooling structures. As another example, the first cooling unit 1041 and the second cooling unit 1042 may be independently configured or may together constitute different functional parts of the same cooler 104.

[0094] Specifically, the first cooling unit 1041, after being installed in the compression chamber 1011a, can regulate the temperature corresponding to the working process on the compression side. Since the compression piston 102 moves within the compression chamber 1011a and compresses the working fluid, the working fluid typically experiences a temperature rise during compression. The wall surface of the corresponding area within the compression chamber 1011a may also experience a temperature rise due to the pressure and heat transfer of the working fluid. The first cooling unit 1041, installed within the compression chamber 1011a, can directly exchange heat and cool the working fluid within the compression chamber 1011a, and can also regulate the temperature of the wall surface in adjacent areas within the compression chamber 1011a, thereby reducing the temperature rise caused by the compression process. This reduces the overall temperature level of the working fluid within the compression chamber 1011a, decreases heat accumulation on the compression side, and mitigates the adverse effects of heat transfer along the subsequent flow path by the higher-temperature working fluid. For example, the first cooling unit 1041 may be disposed in a local area of ​​the compression chamber 1011a, or it may be disposed in a corresponding area of ​​at least a portion of the wall of the compression chamber 1011a, so as to cool different areas according to the heat distribution in the compression chamber 1011a.

[0095] After the second cooling unit 1042 is installed in the transition cavity 1012a, it can regulate the temperature of the expansion cavity 1012b during its operation. Since the transition cavity 1012a is the area where the working fluid expands and absorbs heat, the temperature state in the expansion cavity 1012b will affect the cooling process. The second cooling unit 1042, installed in the transition cavity 1012a, can directly cool the working fluid in the transition cavity 1012a and cool the wall surface of the corresponding area of ​​the transition cavity 1012a, thereby reducing the possibility of external heat entering the expansion cavity 1012b and causing a temperature rise.

[0096] This helps maintain a lower temperature environment inside the expansion cavity 1012b, reduces the adverse effects of heat transfer from the working fluid flowing into the expansion cavity 1012b or the surrounding structure on the expansion process, and thus makes the low temperature state on the expansion cavity 1012b side more stable.

[0097] For example, the second cooling unit 1042 may be located in the transition cavity 1012a near the working fluid inflow area, or it may be located in the corresponding area of ​​the wall of the transition cavity 1012a, or in other locations in the transition cavity 1012a suitable for heat exchange and cooling. This application does not limit this.

[0098] The first cooling unit 1041 and the second cooling unit 1042 are respectively disposed in the compression chamber 1011a and the transition chamber 1012a, thereby enabling temperature regulation of two regions in different thermal states during the refrigeration cycle.

[0099] That is, the first cooling unit 1041 mainly acts on the compression side to reduce the temperature rise caused by the compression piston 102 compressing the working fluid; the second cooling unit 1042 mainly acts on the expansion side to maintain a lower temperature state in the transition chamber 1012a.

[0100] This partitioning method allows the compression chamber 1011a and the transition chamber 1012a to receive corresponding cooling, thereby reducing the adverse effects of the higher temperature on the compression side on the low temperature environment on the expansion side and mitigating the impact of the temperature rise on the expansion side on the refrigeration process.

[0101] In some embodiments, see Figure 1 The first cooling unit 1041 and the second cooling unit 1042 can operate simultaneously. During the operation of the refrigerator 100, the first cooling unit 1041 cools the working fluid in the compression chamber 1011a that has heated up due to compression, thereby reducing the temperature of the working fluid entering the subsequent flow path; the second cooling unit 1042 cools the working fluid and the corresponding area in the transition chamber 1012a, thereby maintaining a lower temperature environment in the transition chamber 1012a.

[0102] In this way, on the one hand, the degree of heat transfer from the compression end to the expansion end can be reduced, and on the other hand, the temperature of the expansion end can be continuously maintained, thereby forming a temperature distribution that is more suitable for the refrigeration cycle between the compression side and the expansion side.

[0103] In some implementations, please refer to Figure 1 The first cooling unit 1041 and the second cooling unit 1042 can also be configured with different cooling capacities according to actual needs. For example, the first cooling unit 1041 can focus on reducing the temperature rise caused by the compression process to reduce the heat accumulation in the compression chamber 1011a; the second cooling unit 1042 can focus on maintaining a lower temperature in the transition chamber 1012a to enhance the cooling effect during the expansion process.

[0104] This allows the two cooling units to adapt to the different heat exchange requirements of the compression and expansion sides, thereby improving the targeted nature of the cooling arrangement.

[0105] In some embodiments, see Figure 1 Although the first cooling unit 1041 and the second cooling unit 1042 are respectively located in different cavities, they can still serve the same refrigeration cycle. Specifically, after the first cooling unit 1041 lowers the temperature of the working fluid in the compression cavity 1011a, it can reduce the heat that the high-temperature working fluid continues to transfer to the expansion side; the second cooling unit 1042 maintains the cooling of the transition cavity 1012a side.

[0106] Therefore, the first cooling unit 1041 and the second cooling unit 1042 can improve the internal temperature conditions of the refrigerator 100 from the two aspects of cooling the compression side and maintaining the expansion side, respectively.

[0107] In some implementations, please refer to Figure 1 and combined Figure 3 The compression chamber 1011a is a chamber used to accommodate the compression piston 102 and to compress the working fluid. The walls of the compression chamber 1011a include a first wall surface 1021, a second wall surface 1011c, and a first peripheral wall 1011b. The first wall surface 1021 is a wall surface opposite to the side of the compression piston 102 facing the compression chamber 1011a; the second wall surface 1011c is a wall surface opposite to the first wall surface 1021; and the first peripheral wall 1011b is a circumferential sidewall connecting the first wall surface 1021 and the second wall surface 1011c. That is, the first wall surface 1021 and the second wall surface 1011c are located on opposite sides of the compression chamber 1011a in the direction of movement of the compression piston 102, and the first peripheral wall 1011b surrounds them to jointly define the compression chamber 1011a. It should be noted that the specific shape, size and relative position of the first wall 1021, the second wall 1011c and the first peripheral wall 1011b are not limited, as long as they can form the compression chamber 1011a and satisfy the movement of the compression piston 102 and the compression process of the working fluid.

[0108] In some embodiments, see Figure 1 and combined Figure 3 At least a portion of the first cooling unit 1041 is disposed on the first peripheral wall 1011b.

[0109] It should be noted that the specific type, structural form, location, and installation method of the first cooling unit 1041 located on the first peripheral wall 1011b are not limited.

[0110] For example, the first cooling unit 1041 can be disposed on the inner surface of the first peripheral wall 1011b facing the compression chamber 1011a, can be embedded in the first peripheral wall 1011b, can be disposed on the side of the first peripheral wall 1011b away from the compression chamber 1011a, or can be integrally formed with the corresponding part of the first peripheral wall 1011b, as long as at least a part of the first cooling unit 1041 is disposed corresponding to the first peripheral wall 1011b and can perform heat exchange cooling on the working fluid in the adjacent area of ​​the first peripheral wall 1011b and / or the first peripheral wall 1011b itself.

[0111] By disposing at least a portion of the first cooling unit 1041 on the first peripheral wall 1011b, the working fluid in the circumferential region of the compression chamber 1011a can be cooled, reducing the heat accumulation of the working fluid in the circumferential region and reducing the adverse effect of the temperature rise of the first peripheral wall 1011b on the temperature of the working fluid in the compression chamber 1011a.

[0112] In some embodiments, see Figure 1 and combined Figure 3 At least a portion of the first cooling unit 1041 is disposed on the second wall surface 1011c.

[0113] It should be noted that the specific location and arrangement of the first cooling unit 1041 on the second wall surface 1011c are not limited.

[0114] For example, the first cooling unit 1041 can be disposed on the side of the second wall 1011c facing the compression cavity 1011a, can be embedded in the second wall 1011c, can be disposed on the side of the second wall 1011c away from the compression cavity 1011a, or can be disposed in cooperation with a corresponding area of ​​the second wall 1011c. The portion of the first cooling unit 1041 disposed on the second wall 1011c can be located in a local area of ​​the second wall 1011c, or can be arranged to extend along at least a portion of the second wall 1011c.

[0115] By disposing at least a portion of the first cooling unit 1041 on the second wall 1011c, the working fluid and the corresponding wall in the area of ​​the compression chamber 1011a away from the compression piston 102 can be cooled, thereby reducing heat accumulation in this area and reducing the impact of heat transfer from the compression side to the subsequent flow area.

[0116] In some embodiments, see Figure 1 and combined Figure 3 At least a portion of the first cooling unit 1041 is disposed on the first wall surface 1021.

[0117] It should be noted that the specific structural form and installation form of the first cooling unit 1041 located on the first wall 1021 are not limited.

[0118] For example, the first cooling unit 1041 can be disposed on the side surface of the first wall 1021 facing the compression chamber 1011a, can be embedded in the first wall 1021, can be disposed on the side of the first wall 1021 away from the compression chamber 1011a, or can be integrally disposed with the first wall 1021, as long as at least a part of the first cooling unit 1041 is disposed corresponding to the first wall 1021 and can perform heat exchange cooling on the working fluid near the first wall 1021 and / or the first wall 1021.

[0119] Since the first wall 1021 is a wall opposite to the side of the compression piston 102 facing the compression chamber 1011a, at least part of the first cooling unit 1041 is disposed on the first wall 1021, which is beneficial to adjust the temperature rise generated in the corresponding area during the compression of the working medium by the compression piston 102, and reduce the adverse effects of the compression process on the temperature distribution in the compression chamber 1011a.

[0120] In some embodiments, see Figure 1 and combined Figure 5 The transition chamber 1012a is a chamber connected to the compression chamber 1011a and located on one side of the expansion piston 103. The working fluid can flow between the compression side and the expansion side through the transition chamber 1012a.

[0121] The wall of the transition cavity 1012a includes a third wall 1031, a fourth wall 1012c, and a second peripheral wall 1012d. The third wall 1031 is a wall that is disposed opposite to the side of the expansion piston 103 facing the transition cavity 1012a. The fourth wall 1012c is a wall that is disposed opposite to the third wall 1031. The second peripheral wall 1012d is a circumferential sidewall that connects the third wall 1031 and the fourth wall 1012c.

[0122] That is, the third wall surface 1031 and the fourth wall surface 1012c are located on both sides of the transition cavity 1012a in the corresponding direction of movement of the expansion piston 103, and the second peripheral wall 1012d is arranged between the two to jointly define the transition cavity 1012a.

[0123] It should be noted that the specific structural form and relative positional relationship of the third wall 1031, the fourth wall 1012c, and the second peripheral wall 1012d are not limited, as long as they can form the transition cavity 1012a and satisfy the working fluid flow and the cooperation of the expansion piston 103.

[0124] In some embodiments, see Figure 1 and combined Figure 5 At least a portion of the second cooling unit 1042 is disposed on the second peripheral wall 1012d.

[0125] It should be noted that the specific arrangement of the second cooling unit 1042 on the second peripheral wall 1012d is not limited. For example, the second cooling unit 1042 can be disposed on the side of the second peripheral wall 1012d facing the transition cavity 1012a, can be embedded in the second peripheral wall 1012d, can be disposed on the side of the second peripheral wall 1012d away from the transition cavity 1012a, or can be integrally formed with the corresponding part of the second peripheral wall 1012d.

[0126] The portion of the second cooling unit 1042 disposed on the second peripheral wall 1012d can be a continuous structure or multiple structural segments spaced apart along the circumference. By disposing at least a portion of the second cooling unit 1042 on the second peripheral wall 1012d, the working fluid and corresponding wall surface in the circumferential region of the transition cavity 1012a can be cooled, reducing heat accumulation in the circumferential region of the transition cavity 1012a and helping to lower the temperature of the working fluid flowing through the transition cavity 1012a.

[0127] In some embodiments, see Figure 1 and combined Figure 5 At least a portion of the second cooling unit 1042 is disposed on the fourth wall surface 1012c.

[0128] It should be noted that the specific location and coverage of the second cooling unit 1042 on the fourth wall surface 1012c are not limited.

[0129] For example, the second cooling unit 1042 may be disposed in a partial area of ​​the fourth wall 1012c, or in at least a portion of the fourth wall 1012c; it may be disposed on the side of the fourth wall 1012c facing the transition cavity 1012a, or on the side of the fourth wall 1012c away from the transition cavity 1012a, or embedded inside the fourth wall 1012c.

[0130] By disposing at least a portion of the second cooling unit 1042 on the fourth wall surface 1012c, the working fluid and the corresponding wall surface in the area of ​​the transition cavity 1012a away from the expansion piston 103 can be cooled, thereby reducing the influence of heat transfer from this area to the interior of the transition cavity 1012a and helping to reduce the heat carried by the working fluid when it enters the subsequent flow path.

[0131] In some embodiments, see Figure 1 and combined Figure 5 At least a portion of the second cooling unit 1042 is disposed on the third wall surface 1031.

[0132] It should be noted that the specific arrangement of the second cooling unit 1042 on the third wall surface 1031 is not limited. For example, the second cooling unit 1042 can be disposed on the surface of the third wall surface 1031 facing the transition cavity 1012a, can be embedded in the third wall surface 1031, can be disposed on the side of the third wall surface 1031 away from the transition cavity 1012a, or can be integrally formed with the third wall surface 1031.

[0133] Since the third wall surface 1031 is a wall surface that is disposed opposite to the side of the expansion piston 103 facing the transition cavity 1012a, at least a portion of the second cooling unit 1042 is disposed on the third wall surface 1031, which can cool the working fluid and the corresponding wall surface near the side of the transition cavity 1012a of the expansion piston 103, thereby reducing the temperature of the corresponding area on the side of the transition cavity 1012a and reducing the adverse effects of heat transfer from this area to the expansion process.

[0134] It should be noted that the first cooling unit 1041, when disposed on the first peripheral wall 1011b, the second wall surface 1011c, and the first wall surface 1021, can be disposed individually or simultaneously on two or three of them; this application does not limit this. Similarly, the second cooling unit 1042, when disposed on the second peripheral wall 1012d, the fourth wall surface 1012c, and the third wall surface 1031, can also be disposed individually or simultaneously on two or three of them; this application also does not limit this.

[0135] Furthermore, the arrangement of the first cooling unit 1041 and the second cooling unit 1042 on the corresponding wall can be independent of each other, and they are not required to adopt the same structural form, installation method or layout range.

[0136] By arranging the first cooling unit 1041 and the second cooling unit 1042 at at least one location on the corresponding wall surface according to the heat distribution in different regions of the compression chamber 1011a and the transition chamber 1012a, the compression side and the transition side can be cooled, thereby reducing the temperature rise caused by the compression process, reducing the situation where the working fluid carries high heat when flowing to the expansion side, and improving the cooling effect of the refrigerator 100.

[0137] In some embodiments, see Figure 1 , Figure 2 , Figure 3 and combined Figure 4 The expander housing assembly 1012 includes a transition chamber 1012a and an expansion chamber 1012b. The transition chamber 1012a is connected to the compressor housing assembly 1011. The expansion chamber 1012b and the transition chamber 1012a are located on both sides of the expansion piston 103. The expansion piston 103 is provided with a connecting channel and a regenerator. The connecting channel connects the transition chamber 1012a and the expansion chamber 1012b. The first cavity Q includes the transition chamber 1012a. The cooler 104 is located in the transition chamber 1012a.

[0138] Specifically, the compressor housing assembly 1011 is provided with a compression chamber 1011a, and the expander housing assembly 1012 is provided with a transition chamber 1012a. The working fluid in the compression chamber 1011a flows to the transition chamber 1012a through the communication structure 107 provided outside the housing assembly 101, so as to carry out the subsequent expansion and refrigeration process in the expander.

[0139] It should be noted that the specific type, structure, installation method, and specific location of the cooler 104 within the transition cavity 1012a are not limited.

[0140] For example, the cooler 104 can be entirely disposed within the transition cavity 1012a, or it can be partially disposed within the transition cavity 1012a, as long as the portion located within the transition cavity 1012a can cool the working fluid within the transition cavity 1012a and / or the corresponding area of ​​the transition cavity 1012a.

[0141] Since the compressor housing assembly 1011 and the expander housing assembly 1012 are connected by the communication structure 107 outside the housing assembly 101, the working fluid needs to pass through the external path of the housing assembly 101 during the process of flowing from the compression chamber 1011a to the transition chamber 1012a.

[0142] Thus, when the working fluid flows through the connecting structure 107, it may be affected by the temperature rise on the compression side or by the heat transfer from the external environment, thereby increasing the temperature of the working fluid entering the transition cavity 1012a.

[0143] After the cooler 104 is placed in the transition cavity 1012a, it can directly exchange heat and cool the working fluid after it enters the transition cavity 1012a, and can regulate the temperature of the adjacent area and the corresponding wall surface in the transition cavity 1012a, thereby reducing the adverse effects of the working fluid temperature rise transmitted through the external connection structure 107 on the low temperature environment on the expansion side.

[0144] Meanwhile, the cooler 104 is located in the transition cavity 1012a, which also helps to reduce the heat accumulation in the transition cavity 1012a, maintain a lower temperature on the side of the transition cavity 1012a, and reduce the impact of external ambient heat being transferred to the transition cavity 1012a through the expansion housing assembly 1012.

[0145] For example, the cooler 104 can be disposed within the transition cavity 1012a near the communication structure 107 connecting to the transition cavity 1012a, so as to cool the working fluid after it enters the transition cavity 1012a. For example, the cooler 104 can also be disposed in the corresponding area of ​​the wall of the transition cavity 1012a, so as to regulate the heat exchange between the working fluid in the transition cavity 1012a and the wall of the transition cavity 1012a. For example, the cooler 104 can also be disposed in other suitable locations for heat exchange and cooling within the transition cavity 1012a, which is not limited in this application.

[0146] By placing the cooler 104 inside the transition cavity 1012a, it can directly act on the expansion side region, thereby helping to maintain lower temperature conditions during the expansion process and improving the cooling effect and energy utilization efficiency of the refrigerator 100.

[0147] In some embodiments, see Figure 2 The housing assembly 101 is also provided with a connecting channel, which connects the compressor housing assembly 1011 and the expander housing assembly 1012. The first cavity Q includes the connecting channel, and the cooler 104 is disposed in the connecting channel.

[0148] Specifically, the connecting channel connects the compression chamber 1011a and the transition chamber 1012a.

[0149] For example, the communication channel can be directly formed from the housing body of the housing assembly 101; see [link to relevant documentation]. Figure 2 The connecting channel includes a connecting structure 107 reserved inside the housing assembly 101. The connecting structure 107 can be a channel structure, a groove structure, a hole structure, or an enclosing space; it can also be formed by different parts of the housing assembly 101 cooperating to enclose it, as long as the connecting channel is located inside the housing assembly 101 and can realize fluid communication between the compression chamber 1011a and the transition chamber 1012a.

[0150] It should be noted that the specific type, structure, installation method, and specific location of the cooler 104 in the connecting channel are not limited.

[0151] For example, the cooler 104 can be entirely disposed within the connecting channel, or only partially disposed within the corresponding area of ​​the connecting channel; it can be disposed on the inner wall of the connecting channel, embedded in the housing body forming the connecting channel, or integrally disposed with the housing body forming the connecting channel, as long as it can perform heat exchange and cooling of the working fluid flowing through the connecting channel. When the refrigerator 100 is working, the compression piston 102 moves in the compression chamber 1011a and compresses the working fluid. The heated working fluid flows from the compression chamber 1011a to the transition chamber 1012a through the connecting channel.

[0152] Since the cooler 104 is located at the connecting channel, the working fluid can be cooled during its transfer from the compression chamber 1011a to the transition chamber 1012a. This reduces the temperature before entering the transition chamber 1012a, minimizing the temperature rise caused by the compression process and reducing the degree of heat transfer from the compression side to the transition chamber 1012a. This helps to lower the temperature in the corresponding region of the transition chamber 1012a, thereby mitigating the adverse effects of heat transfer to the expansion process and improving the cooling effect of the refrigerator 100.

[0153] In some embodiments, see Figure 6 and combined Figure 7 The wall of the first cavity Q includes a portion of the housing assembly 101, and the cooler 104 is disposed on the inner wall of a portion of it. A heat dissipation structure 105 is provided on the surface of a portion of the housing assembly 101 facing away from the cooler 104.

[0154] For example, when the first cavity Q includes a compression cavity 1011a and a transition cavity 1012a, this part of the housing assembly 101 can be the housing wall portion corresponding to the first wall surface 1021, the second wall surface 1011c, or the first peripheral wall 1011b of the compression cavity 1011a, or it can be the housing wall portion corresponding to the third wall surface 1031, the fourth wall surface 1012c, or the second peripheral wall 1012d of the transition cavity 1012a.

[0155] The cooler 104 can be attached, embedded, or integrally disposed on the inner wall surface of the housing wall so that the cooler 104 faces the working fluid in the first cavity Q; the heat dissipation structure 105 can be disposed on the outer surface of the housing wall away from the first cavity Q so as to dissipate the heat transferred by the cooler 104 to the wall of the housing assembly 101.

[0156] In this way, the cooler 104 can exchange heat and cool the working fluid adjacent to the wall of the first cavity Q, and the heat dissipation structure 105 can improve the heat dissipation capacity between the corresponding part of the housing assembly 101 and the outside world, thereby reducing the accumulation of heat on the wall of the housing assembly 101 and maintaining a lower temperature level in the corresponding area of ​​the cooler 104.

[0157] For example, when the cooler 104 is disposed on the wall of the compression chamber 1011a, this part of the housing assembly 101 can be the first peripheral wall 1011b of the compression chamber 1011a. The cooler 104 is disposed on the inner wall of the first peripheral wall 1011b facing the compression chamber 1011a, and the outer surface of the first peripheral wall 1011b away from the cooler 104 is provided with heat dissipation fins 1051. When the compression piston 102 compresses the working fluid, the working fluid in the compression chamber 1011a generates a temperature rise. The cooler 104 can cool the working fluid in the area adjacent to the first peripheral wall 1011b, and the heat absorbed by the wall of the housing assembly 101 can be dissipated through the heat dissipation fins 1051 on the outer surface, thereby reducing the heat accumulation in the circumferential area of ​​the compression chamber 1011a.

[0158] For example, this part of the housing assembly 101 may also be a second wall surface 1011c or a first wall surface 1021. The cooler 104 is disposed on the inner wall surface of the second wall surface 1011c or the first wall surface 1021. A heat dissipation structure 105 is provided on the surface of the second wall surface 1011c or the first wall surface 1021 away from the cooler 104 to provide targeted cooling for the area of ​​the compression chamber 1011a away from the compression piston 102 or the area of ​​the compression piston 102.

[0159] For example, when the cooler 104 is disposed on the corresponding wall of the transition cavity 1012a, this part of the housing assembly 101 can be the third wall 1031. Since the third wall 1031 is a wall disposed opposite to the side of the expansion piston 103 facing the transition cavity 1012a, after the cooler 104 is disposed on the inner wall of the third wall 1031, it can cool the working fluid in the area corresponding to the side of the expansion piston 103 away from the expansion cavity 1012b. The heat dissipation structure 105 disposed on the outer side of the third wall 1031 can dissipate heat from the outer surface of the housing assembly 101, thereby helping to reduce the temperature of the area corresponding to the side of the expansion piston 103 away from the expansion cavity 1012b and weakening the adverse effects of heat transfer from this area to the expansion process. For example, this part of the housing assembly 101 may also be a fourth wall surface 1012c or a second peripheral wall 1012d, with the cooler 104 and heat dissipation structure 105 respectively disposed on the inner and outer sides of the corresponding wall to adjust the heat exchange in different areas of the transition cavity 1012a.

[0160] For example, when the housing assembly 101 has a connecting channel between the compression chamber 1011a and the transition chamber 1012a, this part of the housing assembly 101 can also be the housing body wall forming the connecting channel. The cooler 104 can be disposed on the inner wall surface of the connecting channel, and the heat dissipation structure 105 can be disposed on the outer surface of the housing wall forming the connecting channel. In this way, when the working fluid flows from the compression chamber 1011a to the transition chamber 1012a, it can directly exchange heat with the cooler 104 during the process of passing through the connecting channel. The heat absorbed by the cooler 104 is transferred to the outer heat dissipation structure 105 through the housing wall and dissipated outward, thereby reducing the adverse effects of the temperature rise caused by the compression process on the transition chamber 1012a and the subsequent expansion process.

[0161] It should be noted that this part of the housing assembly 101 can be a single wall or multiple adjacent walls; the cooler 104 can be disposed on the inner wall surface of only one of the walls, or it can be disposed on the inner wall surfaces of multiple walls; the heat dissipation structure 105 can also be disposed in a one-to-one correspondence with each wall. This application does not limit the specific shape, size, coverage area and installation method of the cooler 104 and the heat dissipation structure 105, as long as the arrangement relationship of the cooler 104 being located on the inner side of the wall of the housing assembly 101 and the heat dissipation structure 105 being located on the outer side of the corresponding wall is acceptable.

[0162] In some embodiments, see Figure 6 and combined Figure 7 The heat dissipation structure 105 includes heat dissipation fins 1051.

[0163] Specifically, the heat dissipation fins 1051 can be disposed on the surface of the corresponding portion of the housing assembly 101 facing away from the cooler 104, and extend outward from that surface. It should be noted that the specific number, shape, size, arrangement, and extension direction of the heat dissipation fins 1051 are not limited. For example, the heat dissipation fins 1051 can be multiple spaced-apart sheet-like structures, or they can be strip-like structures extending continuously along the surface of the housing assembly 101; the heat dissipation fins 1051 can be arranged in parallel or staggered arrangements, as long as they can increase the heat exchange area between the corresponding portion of the housing assembly 101 and the external environment.

[0164] A cooler 104 is disposed on the inner wall surface of the corresponding portion of the housing assembly 101, and heat dissipation fins 1051 are disposed on the outer surface of this portion away from the cooler 104, thereby forming a heat transfer section between the cooler 104 and the heat dissipation fins 1051 on the corresponding wall portion of the housing assembly 101. When the cooler 104 cools the working fluid in the adjacent area of ​​the first cavity Q, heat can be transferred to the corresponding wall portion of the housing assembly 101 and further conducted to the outer heat dissipation fins 1051, which can then dissipate the heat to the external environment. In this way, the accumulation of heat on the wall portion of the housing assembly 101 can be reduced, the temperature level of the corresponding wall surface can be lowered, and the heat exchange conditions in the corresponding area of ​​the cooler 104 can be maintained.

[0165] In other embodiments, the heat dissipation structure 105 includes a heat sink capable of improving the heat dissipation capacity of the housing assembly 101. For example, the heat dissipation structure 105 includes a heat sink column disposed on the outer surface of the housing assembly 101 and opposite to the cooler 104. The heat dissipation structure 105 is disposed on the outer surface of the housing assembly 101 corresponding to the cooler 104, with the cooler 104 located inside the housing assembly 101 and the heat dissipation structure 105 located outside the housing assembly 101, thereby positioning the housing assembly 101 between the cooler 104 and the heat dissipation structure 105.

[0166] In this application, when the cooler 104 cools the working fluid in the first cavity Q, the cooler 104 absorbs heat from the working fluid in the first cavity Q and transfers the heat to the side away from the first cavity Q. The heat dissipation structure 105 disposed on the surface of the housing assembly 101 opposite to the surface of the cooler 104 can dissipate this heat, thereby improving the heat dissipation capacity of the corresponding area of ​​the cooler 104. In this way, the adverse effects of heat accumulation on the outside of the cooler 104 on the continuous operation of the cooler 104 can be reduced, and the cooling effect of the cooler 104 on the working fluid in the first cavity Q can be maintained.

[0167] For example, the heat dissipation structure 105 can be disposed in a local area of ​​the housing assembly 101 corresponding to the cooler 104, or it can be disposed in a larger area of ​​the housing assembly 101 corresponding to the cooler 104, as long as it can dissipate the heat transferred from the cooler 104 to the outside of the housing assembly 101. The specific shape, size and arrangement of the heat dissipation structure 105 are not limited in the embodiments of this application.

[0168] The heat can be dissipated to the outside through the heat dissipation structure 105 to reduce the accumulation of heat in the corresponding part of the housing assembly 101.

[0169] In some embodiments, see Figure 6 and combined Figure 7 The wall of the first cavity Q includes a portion of the housing assembly 101, a portion of which has an opening 101a. A cooler 104 is disposed in the opening 101a, and the surface of the cooler 104 facing the first cavity Q forms the wall of the first cavity Q.

[0170] The cooler 104 is installed within the opening 101a. After being positioned within the opening 101a, the side of the cooler 104 facing the interior of the housing assembly 101, together with the corresponding portion of the housing assembly 101, the compression piston 102, and the expansion piston 103, defines the boundary of the first cavity Q. Simultaneously, the placement of the cooler 104 within the opening 101a facilitates the assembly of the cooler 104 with the housing assembly 101. Furthermore, utilizing the opening 101a position helps prevent the cooler 104 from occupying additional internal space within the first cavity Q, reducing its adverse impact on the effective volume of the first cavity Q, thereby balancing the cooling effect and volume requirements of the first cavity Q.

[0171] It should be noted that this application does not limit the specific structural form of the opening 101a.

[0172] For example, the opening 101a can be a hole structure that penetrates this part of the housing assembly 101, or it can be a groove structure or receiving groove structure with the opening 101a facing the first cavity Q, as long as it can be used to set the cooler 104 and make the surface of the cooler 104 facing the first cavity Q form at least a part of the wall surface of the first cavity Q.

[0173] Meanwhile, this application does not limit the specific type, structural form, installation method, or the matching relationship between the cooler 104 and the opening 101a. For example, the cooler 104 may be fully accommodated in the opening 101a, or it may be only partially accommodated in the opening 101a; the cooler 104 may be assembled with the wall of the opening 101a, or it may be integrally set with the corresponding part of the housing assembly 101.

[0174] After the cooler 104 is disposed within the opening 101a, the surface of the cooler 104 facing the first cavity Q directly faces the interior of the first cavity Q and forms at least a portion of the wall surface of the first cavity Q. That is, the surface of the cooler 104 facing the first cavity Q can directly serve as part of the inner boundary of the first cavity Q, and together with the remaining inner wall surface of this portion of the housing assembly 101, define the first cavity Q. For example, the surface of the cooler 104 facing the first cavity Q can be substantially flush with the corresponding inner wall surface of the housing assembly 101, or it can be slightly protruding or slightly concave relative to the inner wall surface of the housing assembly 101. This application does not limit this, as long as it can form the wall surface of the first cavity Q and perform heat exchange and cooling on the working fluid inside the first cavity Q.

[0175] For example, when this part of the housing assembly 101 is the wall corresponding to the first wall surface 1021, the second wall surface 1011c, or the first peripheral wall 1011b of the compression chamber 1011a, the opening 101a can be provided on the first wall surface 1021, the second wall surface 1011c, or the first peripheral wall 1011b, and the cooler 104 is embedded in the opening 101a, with the surface of the cooler 104 facing the compression chamber 1011a forming part of the wall surface of the compression chamber 1011a. In this way, when the compression piston 102 compresses the working fluid, the heated working fluid in the compression chamber 1011a can directly exchange heat with the surface of the cooler 104 facing the compression chamber 1011a.

[0176] For example, when this part of the housing assembly 101 is the wall corresponding to the third wall surface 1031, the fourth wall surface 1012c, or the second peripheral wall 1012d of the transition cavity 1012a, the opening 101a can be provided on the third wall surface 1031, the fourth wall surface 1012c, or the second peripheral wall 1012d, and the cooler 104 is provided in the opening 101a, with the surface of the cooler 104 facing the transition cavity 1012a forming part of the wall surface of the transition cavity 1012a. In this way, the working fluid flowing through the transition cavity 1012a can directly exchange heat with the cooler 104, thereby reducing the temperature of the corresponding area of ​​the transition cavity 1012a.

[0177] For example, when the housing assembly 101 is provided with a connecting channel between the compression chamber 1011a and the transition chamber 1012a, this part of the housing assembly 101 can also be a wall forming the connecting channel, with an opening 101a provided on the wall, a cooler 104 provided in the opening 101a, and the surface of the cooler 104 facing the connecting channel forming part of the inner wall of the connecting channel, so as to cool the working fluid flowing through the connecting channel.

[0178] Since the surface of the cooler 104 facing the first cavity Q directly forms the wall of the first cavity Q, there is no need for heat transfer between the cooler 104 and the working fluid inside the first cavity Q through an additional wall. This allows the cooler 104 to more directly regulate the temperature of the working fluid in the adjacent area of ​​the first cavity Q. At the same time, the cooler 104 is disposed within the opening 101a of the housing assembly 101, which also facilitates the integration of the cooler 104 with the housing assembly 101, achieving cooling of the working fluid inside the first cavity Q while forming the wall structure of the first cavity Q.

[0179] In some embodiments, see Figure 4 and combined Figure 5 The cooler 104 includes a thermoelectric cooler, the cold end of which faces the first cavity.

[0180] It should be noted that the specific structural form, size, installation method, and specific placement position of the thermoelectric cooler on the housing assembly 101 are not limited, as long as the cold end of the thermoelectric cooler can face the first cavity and can cool the working fluid and / or the corresponding area of ​​the first cavity. For example, the thermoelectric cooler can be disposed on the wall portion of the housing assembly 101 forming the first cavity, embedded in the wall portion of the housing assembly 101, or configured in conjunction with a corresponding part of the housing assembly 101.

[0181] The cold end of the thermoelectric cooler faces the first cavity, indicating that when the thermoelectric cooler is working, the side of it used for heat absorption and cooling faces the inside of the first cavity, or is arranged corresponding to the wall of the first cavity, so as to perform heat exchange and cooling on the adjacent area inside the first cavity.

[0182] In some embodiments, the cooler 104 further includes a terminal block that extends through the housing assembly 101 and communicates with the outside.

[0183] With the above configuration, the outside world can be electrically connected to the cooler 104 via the wiring terminals, thereby facilitating the supply of power or control to the cooler 104 so that the cooler 104 can cool the working fluid in the first cavity Q.

[0184] It should be understood that the specific location of the wiring terminals is not limited in the embodiments of this application. For example, the wiring terminals can be located on the housing assembly 101 near the cooler 104, or they can be located on the housing assembly 101 away from the cooler 104, as long as the wiring terminals can penetrate the housing assembly 101 and communicate with the outside to realize the electrical connection between the cooler 104 and the outside. The specific arrangement of the wiring terminals is not limited in the embodiments of this application.

[0185] In some embodiments, see Figure 4 and combined Figure 5The refrigerator 100 also includes a temperature sensor 106 and a controller. The temperature sensor 106 is used to detect the temperature of the working fluid in the first cavity Q. The controller is connected to the temperature sensor 106 and the cooler 104 and is used to control and adjust the power of the cooler 104 according to the working fluid temperature detected by the temperature sensor 106.

[0186] Specifically, the temperature sensor 106 can be located at a corresponding position in the first cavity Q to detect the temperature of the working fluid inside the first cavity Q. The controller is electrically connected to the temperature sensor 106 to acquire the working fluid temperature information detected by the temperature sensor 106. The controller is also connected to the cooler 104 to adjust the operating power of the cooler 104 based on the working fluid temperature information. That is, the controller can control the cooling intensity of the cooler 104 based on the change in the working fluid temperature inside the first cavity Q.

[0187] For example, when the temperature sensor 106 detects an increase in the working fluid temperature inside the first cavity Q, the controller can control the cooler 104 to increase its power to enhance the cooling effect on the working fluid inside the first cavity Q; when the temperature sensor 106 detects a decrease in the working fluid temperature inside the first cavity Q, the controller can control the cooler 104 to decrease its power to maintain the cooler 104 in an operating state that matches the working fluid temperature inside the first cavity Q. Through the above settings, the cooler 104 can dynamically adjust according to the changes in the working fluid temperature inside the first cavity Q, thereby helping to maintain the stability of the working fluid temperature inside the first cavity Q.

[0188] It should be understood that the specific location of the temperature sensor 106 is not limited, as long as it can detect the temperature of the working fluid in the first cavity Q. The specific control method of the controller is also not limited, as long as it can adjust the power of the cooler 104 according to the working fluid temperature detected by the temperature sensor 106. The specific structural forms of the temperature sensor 106 and the controller are not limited in this embodiment.

[0189] In some implementations, please refer to Figure 3 The compression piston 102 is slidably disposed within the compressor housing. A driving member is kinetically connected to the compression piston 102 to drive the compression piston 102 to reciprocate along the extension direction of the compression chamber. As the compression piston 102 moves, the volume of the compression chamber 1011a formed between the compression piston 102 and a portion of the cooler 104 changes, thereby compressing or releasing the working fluid within the compression chamber 1011a. Since the compression chamber 1011a constitutes at least a part of the first chamber Q, the working fluid within the compression chamber 1011a can communicate with the working fluid in other areas of the first chamber Q and participate in the refrigeration cycle of the refrigerator 100.

[0190] It should be noted that the driving component can be a driving structure capable of driving the compression piston 102 to reciprocate. The specific structural form of the driving component is not limited in the embodiments of this application.

[0191] For example, the driving component is a drive motor, and the output end of the drive motor is connected to the compression piston 102.

[0192] Another example is that the driving component is an electromagnetic driving component. Specifically, the electromagnetic driving component includes an electromagnetic coil and a permanent magnet connected to the compression piston. The electromagnetic coil is located on the outer periphery of the permanent magnet. After the electromagnetic coil is energized, it drives the permanent magnet to move the compression piston 102.

[0193] It should be understood that the driving method of the expansion piston 103 is not limited in the embodiments of this application. For example, the refrigerator 100 may be provided with an independent driving structure to drive the expansion piston 103 to move. In another example, the refrigerator 100 may not be provided with an independent driving structure, and the expansion piston 103 may move under the action of different chamber air pressure changes generated by the movement of the compression piston 102, that is, the expansion piston 103 may be moved by pneumatic means.

[0194] In some embodiments, see Figure 3 and combined Figure 5 The compressor housing assembly 1011 includes a first elastic element 108, which is connected to the compression piston 102 and is located on the side of the compression piston 102 away from the compression chamber 1011a.

[0195] Specifically, the compression piston 102 is movably disposed within the compressor housing assembly 1011, with one side of the compression piston 102 facing the compression chamber 1011a and the other side facing away from the compression chamber 1011a. The first elastic member 108 is disposed on the side of the compression piston 102 facing away from the compression chamber 1011a and is connected to the compression piston 102.

[0196] In this way, during the movement of the compression piston 102, the first elastic element 108 can provide elastic force to the compression piston 102, thereby providing elastic support and elastic adjustment for the movement of the compression piston 102.

[0197] It should be noted that the first elastic element 108 can be a spring, as long as it can provide elastic force to the compression piston 102. This application embodiment does not limit this.

[0198] The first elastic element 108 is disposed on the side of the compression piston 102 opposite to the compression chamber 1011a. It provides elastic support to the compression piston 102 without affecting the formation of the compression chamber 1011a, thereby reducing vibration and impact during the movement of the compression piston 102 and improving its stability. Simultaneously, the first elastic element 108 also facilitates the reset and position adjustment of the compression piston 102 during its movement, thus promoting smoother volume changes in the compression chamber 1011a and further enhancing the stability of the compression process.

[0199] In some embodiments, see Figure 3 and combined Figure 5 The expander housing assembly 1012 includes a second elastic element 109, which is connected to the expansion piston 103 and is disposed within the expansion cavity 1012b.

[0200] Specifically, the expansion piston 103 is movably disposed within the expansion housing assembly 1012, and together with the expansion housing assembly 1012, forms an expansion cavity 1012b. A second elastic element 109 is disposed within the expansion cavity 1012b and connected to the expansion piston 103. Thus, when the expansion piston 103 moves, the second elastic element 109 can elastically deform along with the expansion piston 103 to provide an elastic force to the expansion piston 103. It should be understood that the second elastic element 109 can be a spring, as long as it can provide elastic support or elastic reset for the expansion piston 103; this embodiment does not limit this.

[0201] The second elastic element 109 is disposed within the expansion cavity 1012b and connected to the expansion piston 103. It provides elastic support to the expansion piston 103, thereby reducing vibration and impact during the movement of the expansion piston 103 and improving the stability of its movement. Simultaneously, the second elastic element 109 also facilitates the reset and position adjustment of the expansion piston 103 during its movement, thus promoting smoother volume changes in the expansion cavity 1012b and further enhancing the stability of the expansion process.

[0202] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A refrigeration machine, characterized in that, The device includes a housing assembly, a compression piston, an expansion piston, and a cooler. The compression piston and the expansion piston are both disposed within the housing assembly. The housing assembly has a first cavity located between the compression piston and the expansion piston. The cooler is disposed within the first cavity.

2. The refrigeration machine according to claim 1, characterized in that, The housing assembly includes a compressor housing assembly and an expander housing assembly. The compression piston is disposed within the compressor housing assembly, and the expansion piston is disposed within the expander housing assembly. The first cavity is a chamber within the compressor housing assembly and / or a chamber within the expander housing assembly.

3. The refrigeration machine according to claim 1, characterized in that, The housing assembly includes a compressor housing assembly, the compressor housing assembly includes a compression chamber, the compression chamber is in communication with the expander housing assembly, the first cavity includes the compression chamber, and at least a portion of the cooler is disposed within the compression chamber.

4. The refrigeration machine according to claim 3, characterized in that, The cooler is disposed in the compression chamber, and the compression chamber includes a first wall surface of the compression piston facing the compression chamber, a second wall surface opposite to the first wall surface, and a first peripheral wall disposed on the first wall surface and the second wall surface; At least a portion of the cooler is disposed on the first peripheral wall; and / or, at least a portion of the cooler is disposed on the second wall surface; and / or, at least a portion of the cooler is disposed on the first wall surface.

5. The refrigeration machine according to claim 3, characterized in that, The expander housing assembly includes a transition cavity communicating with the compression chamber, and the first cavity further includes the transition cavity; the cooler includes a first cooling unit and a second cooling unit, the first cooling unit being disposed in the compression chamber and the second cooling unit being disposed in the transition cavity.

6. The refrigeration machine according to claim 5, characterized in that, The compression chamber includes a first wall surface of the compression piston facing the compression chamber, a second wall surface opposite to the first wall surface, and a first peripheral wall disposed on the first wall surface and the second wall surface; at least a portion of the first cooling unit is disposed on the first peripheral wall; and / or, at least a portion of the first cooling unit is disposed on the second wall surface; and / or, at least a portion of the first cooling unit is disposed on the first wall surface.

7. The refrigeration machine according to claim 5, characterized in that, The transition cavity includes a third wall surface of the expansion piston facing the transition cavity, a fourth wall surface opposite to the third wall surface, and a second peripheral wall disposed on the third wall surface and the fourth wall surface; At least a portion of the second cooling unit is disposed on the second peripheral wall; and / or, at least a portion of the second cooling unit is disposed on the fourth wall surface; and / or, at least a portion of the second cooling unit is disposed on the third wall surface.

8. The refrigeration machine according to claim 1, characterized in that, The housing assembly includes an expansion housing assembly, which includes a transition chamber and an expansion chamber. The transition chamber is connected to the compressor housing assembly. The expansion chamber and the transition chamber are located on both sides of the expansion piston. The expansion piston is provided with a connecting channel and a regenerator. The connecting channel connects the transition chamber and the expansion chamber. The first cavity includes the transition chamber, and the cooler is located inside the transition chamber.

9. The refrigeration machine according to claim 1, characterized in that, The housing assembly includes a compressor housing assembly and an expander housing assembly. The housing assembly also has a connecting channel that connects the compressor housing assembly and the expander housing assembly. The first cavity includes the connecting channel, and the cooler is disposed in the connecting channel.

10. The refrigeration machine according to any one of claims 1-9, characterized in that, The wall of the first cavity includes a portion of the housing assembly, the cooler is disposed on the inner wall of the portion, and the surface of the portion of the housing assembly facing away from the cooler is provided with a heat dissipation structure.

11. The refrigeration machine according to claim 10, characterized in that, The heat dissipation structure includes heat dissipation fins.

12. The refrigeration machine according to any one of claims 1-9, characterized in that, The wall of the first cavity includes a portion of the housing assembly, the portion having an opening, the cooler being disposed within the opening, and the surface of the cooler facing the first cavity forming the wall of the first cavity.

13. The refrigeration machine according to any one of claims 1-9, characterized in that, The cooler includes a thermoelectric cooler, the cold end of which faces the first cavity.

14. The refrigeration machine according to any one of claims 1-9, characterized in that, It also includes a temperature sensor and a controller. The temperature sensor is used to detect the temperature of the working fluid in the first cavity. The controller is connected to the temperature sensor and the cooler and is used to control and adjust the power of the cooler according to the working fluid temperature detected by the temperature sensor.

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