Refrigerator

Abstract

The present application relates to the technical fields of refrigeration and low temperature engineering, and provides a kind of refrigerator, including first refrigeration unit, second refrigeration unit, connecting plate and flexible connecting piece, the two sides of connecting plate are formed room temperature side and low temperature side respectively, first refrigeration unit is connected with connecting plate, and the two ends of first refrigeration unit are arranged in room temperature side and low temperature side respectively, second refrigeration unit is connected with connecting plate, and the two ends of second refrigeration unit are arranged in room temperature side and low temperature side respectively, flexible connecting piece is arranged in one side of room temperature side, one end of flexible connecting piece is connected with first refrigeration unit or second refrigeration unit, and the other end of flexible connecting piece is connected with connecting plate.The deformation of the parts of first refrigeration unit and second refrigeration unit can be compensated by the deformation of flexible connecting piece in room temperature side, so as to avoid serious deformation, and the low temperature side does not need to use redundant flexible connecting mechanism, to realize the increase of heat transfer efficiency and the improvement of refrigeration performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration and cryogenics, and particularly relates to a refrigeration machine. BACKGROUND

[0002] The regenerative refrigeration machine adopts a multi-stage structure, which can be generally divided into a thermal coupling type and a gas coupling type. The thermal coupling structure transmits the cold energy of the cold head of the pre-cooling stage to the low-temperature stage through a thermal bridge, and the working gas in the pre-cooling stage and the low-temperature stage does not interfere with each other. The gas coupling structure uses the same compressor to drive the pre-cooling stage and the low-temperature stage, and the working gas flowing between the two stages influences each other, and the gas amount going to the two stages is determined by the impedance of each stage.

[0003] The conventional thermal coupling regenerative refrigeration machine is connected through a thermal bridge between different refrigeration machines. In order to avoid the problems of excessive stress or size deformation of components caused by thermal expansion and contraction of components due to changes in the temperature of the refrigeration machine, a flexible connection is used between the end of the thermal bridge and the cold head of the refrigeration machine, or between the end of the thermal bridge and the component to be cooled, such as a copper braid, a graphite element, and a heat pipe. However, this method inevitably increases the contact surface between components, and the existence of the contact surface inevitably increases the contact thermal resistance, thereby affecting the heat transfer effect.

[0004] It is necessary to pay a great price to obtain cold energy at low temperature, and therefore, there is an urgent need for a refrigeration machine to reduce thermal resistance and improve heat transfer effect. SUMMARY

[0005] The present application provides a refrigeration machine to solve the technical problem that the installation of flexible materials on the thermal bridge affects the heat transfer effect in the prior art, and to achieve the increase of heat transfer efficiency and the improvement of refrigeration performance.

[0006] The present application provides a refrigeration machine, comprising: a first refrigeration unit, a second refrigeration unit, a connecting plate, and a flexible connecting piece.

[0007] Two sides of the connecting plate form a room temperature side and a low temperature side, respectively.

[0008] The first refrigeration unit is connected to the connecting plate, and two ends of the first refrigeration unit are arranged on the room temperature side and the low temperature side, respectively.

[0009] The second refrigeration unit is connected to the connecting plate, and two ends of the second refrigeration unit are arranged on the room temperature side and the low temperature side, respectively.

[0010] The flexible connecting piece is arranged on one side of the room temperature side, one end of the flexible connecting piece is connected to the first refrigeration unit or the second refrigeration unit, and the other end of the flexible connecting piece is connected to the connecting plate.

[0011] According to the present application, a refrigerator is provided, wherein the connecting plate is provided with a first mounting passage and a second mounting passage;

[0012] The first refrigeration unit is adapted to pass through the first mounting passage so that two ends of the first refrigeration unit are arranged at the room temperature side and the low temperature side, respectively;

[0013] The second refrigeration unit is adapted to pass through the second mounting passage so that two ends of the second refrigeration unit are arranged at the room temperature side and the low temperature side, respectively.

[0014] According to the present application, a refrigerator is provided, wherein the first refrigeration unit comprises, in sequence, a first hot end component, a high temperature end component, a position to be cooled component, a first low temperature end component and a first cold head;

[0015] The first hot end component is located at the room temperature side;

[0016] The high temperature end component is adapted to pass through the first mounting passage;

[0017] The position to be cooled component, the first low temperature end component and the first cold head are all located at the low temperature side.

[0018] According to the present application, a refrigerator is provided, wherein the flexible connecting piece is adapted to be sleeved outside the high temperature end component, one end of the flexible connecting piece is sealingly connected with the first hot end component, the other end of the flexible connecting piece is sealingly connected with the connecting plate, and the flexible connecting piece closes the first mounting passage.

[0019] According to the present application, a refrigerator is provided, wherein the first hot end component is adapted to be sealingly connected with the connecting plate by means of fasteners or welding pieces, and the first hot end component closes the first mounting passage.

[0020] According to the present application, a refrigerator is provided, wherein the second refrigeration unit comprises, in sequence, a second hot end component, a second low temperature end component and a second cold head;

[0021] The second hot end component is located at the room temperature side;

[0022] The second low temperature end component is adapted to pass through the second mounting passage;

[0023] The second cold head is located at the low temperature side.

[0024] According to the present application, a refrigerator is provided, wherein the flexible connecting piece is adapted to be sleeved outside the second low temperature end component, one end of the flexible connecting piece is sealingly connected with the second hot end component, the other end of the flexible connecting piece is sealingly connected with the connecting plate, and the flexible connecting piece closes the second mounting passage.

[0025] According to the refrigerator provided by the application, the second hot end component is adapted to be connected with the connecting plate by a fastener or a welding piece, and the second hot end component seals the second mounting channel.

[0026] According to the refrigerator provided by the application, the refrigerator further comprises a heat conduction unit.

[0027] The heat conduction unit is rigidly connected with the position component to be cooled and the second cold head at two ends thereof.

[0028] According to the refrigerator provided by the application, the refrigerator further comprises a heat conduction unit.

[0029] The position component to be cooled, the heat conduction unit and the second cold head are integrally formed.

[0030] The refrigerator provided by the embodiment of the application cools by the first refrigeration unit and the second refrigeration unit, and realizes the transfer of cold energy by the heat conduction unit. During refrigeration, the components of the first refrigeration unit and the second refrigeration unit will deform and shrink due to thermal expansion and contraction, and the deformation amount can be compensated by the flexible connecting piece at the room temperature side at this time, so that the first refrigeration unit and the second refrigeration unit are prevented from generating large thermal stress and serious deformation, the normal work of the refrigerator is ensured, and the first refrigeration unit and the second refrigeration unit do not need to use a redundant flexible connecting mechanism at the low temperature side, so that good heat conductivity can be ensured to increase the heat transfer efficiency and improve the refrigeration performance. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0032] Figure 1 is one of the structural schematic diagrams of the refrigerator provided by the application;

[0033] Figure 2 is the second structural schematic diagram of the refrigerator provided by the application;

[0034] Figure 3 is the third structural schematic diagram of the refrigerator provided by the application;

[0035] Figure 4 is the fourth structural schematic diagram of the refrigerator provided by the application.

[0036] Reference signs:

[0037] 1, connecting plate; 2, first mounting passage; 3, second mounting passage; 4, flexible connecting member; 5, heat conducting unit; 6, first hot end component; 7, high temperature end component; 8, component to be cooled; 9, first low temperature end component; 10, first cold head; 11, second hot end component; 12, second low temperature end component; 13, second cold head. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be further described in details with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0039] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0043] The following will be described in conjunction with Figures 1-4 The refrigerator of the present application is described, comprising a first refrigeration unit, a second refrigeration unit, a connecting plate 1 and a flexible connecting piece 4, wherein the room temperature side and the low temperature side are formed on both sides of the connecting plate 1 respectively, the first refrigeration unit is connected with the connecting plate 1, and both ends of the first refrigeration unit are arranged on the room temperature side and the low temperature side respectively, the second refrigeration unit is connected with the connecting plate 1, and both ends of the second refrigeration unit are arranged on the room temperature side and the low temperature side respectively, the flexible connecting piece is arranged on one side of the room temperature side, one end of the flexible connecting piece 4 is connected with the first refrigeration unit or the second refrigeration unit, and the other end of the flexible connecting piece 4 is connected with the connecting plate 1.

[0044] In the present embodiment, refrigeration is carried out by the first refrigeration unit and the second refrigeration unit, and the heat transfer unit 5 is used to realize the transfer of cold energy. During refrigeration, the parts of the first refrigeration unit and the second refrigeration unit will deform and shrink due to thermal expansion and contraction, and at this time the deformation amount can be compensated by the flexible connecting piece 4 on the room temperature side, so as to avoid the first refrigeration unit and the second refrigeration unit from generating large thermal stress and serious deformation, and to ensure the normal work of the refrigerator. Moreover, the first refrigeration unit and the second refrigeration unit do not need to use a redundant flexible connecting mechanism on the low temperature side, which can ensure good thermal conductivity, so as to increase the heat transfer efficiency and improve the refrigeration performance.

[0045] According to the refrigerator provided by the present application, the first installation channel and the second installation channel are arranged on the connecting plate, wherein the first refrigeration unit is adapted to pass through the first installation channel so that both ends of the first refrigeration unit are arranged on the room temperature side and the low temperature side respectively, and the second refrigeration unit is adapted to pass through the second installation channel so that both ends of the second refrigeration unit are arranged on the room temperature side and the low temperature side respectively. It can be understood that the first installation channel and the second installation channel can be used to arrange both ends of the first refrigeration unit on the room temperature side and the low temperature side respectively, and both ends of the second refrigeration unit on the room temperature side and the low temperature side respectively. Thus, the cold energy of the first refrigeration unit and the second refrigeration unit can be transferred on the low temperature side.

[0046] According to the present application, the first refrigeration unit comprises, in sequence, a first hot end component 6, a high temperature end component 7, a position to be cooled component 8, a first low temperature end component 9 and a first cold head 10, the first hot end component 6 is located at the room temperature side, the high temperature end component 7 is adapted to pass through the first mounting channel 2, the position to be cooled component 8, the first low temperature end component 9 and the first cold head 10 are all located at the low temperature side. The first refrigeration unit is formed by using the first hot end component 6, the high temperature end component 7, the position to be cooled component 8, the first low temperature end component 9 and the first cold head 10, and the high temperature end component 7 is passed through the first mounting channel 2 to realize the passing between the first refrigeration unit and the first mounting channel 2.

[0047] The second refrigeration unit comprises, in sequence, a second hot end component 11, a second low temperature end component 12 and a second cold head 13, the second hot end component 11 is located at the room temperature side, the second low temperature end component 12 is adapted to pass through the second mounting channel 3, and the second cold head 13 is located at the low temperature side. The second refrigeration unit is formed by using the second hot end component 11, the second low temperature end component 12 and the second cold head 13, and the second low temperature end component 12 is passed through the second mounting channel 3 to realize the passing between the second refrigeration unit and the second mounting channel 3.

[0048] According to the present application, the refrigeration machine further comprises a heat conduction unit 5, two ends of the heat conduction unit 5 are rigidly connected with the position to be cooled component 8 and the second cold head 13 respectively, so that the cold energy of the second cold head 13 is transmitted to the position to be cooled component 8 through the heat conduction unit 5, and the temperature of the position to be cooled component 8 is gradually forced to be cooled to a temperature close to that of the second cold head 13. Moreover, a redundant flexible connecting mechanism is avoided to be arranged between the heat conduction unit 5 and the position to be cooled component 8, and between the heat conduction unit 5 and the second cold head 13, so that the transmission thermal resistance of the cold energy at the low temperature side is small, and the heat conduction unit 5 has good heat conduction, so as to increase the heat transfer efficiency and improve the refrigeration performance.

[0049] The first cold head 10 can be provided in a groove type structure, and the first cold head 10 is directly clamped on the first low temperature end component 9. The heat conduction unit 5 can be provided in a plate type structure, and one end of the heat conduction unit 5 is rigidly connected with one end of the position to be cooled component 8, and the other end of the heat conduction unit 5 is rigidly connected with the second cold head 13. Figure 1 Figure 2 The position to be cooled component 8, the heat conduction unit 5 and the second cold head 13 can be integrally processed and formed. Figure 3 Figure 4 The position to be cooled component 8, the heat conduction unit 5 and the second cold head 13 can be integrally processed and formed.

[0050] ​​In one embodiment of the present invention, the flexible connector 4 is adapted to be sleeved on the outside of the high-temperature end component 7. One end of the flexible connector 4 is sealed to the first hot end component 6, and the other end of the flexible connector 4 is sealed to the connecting plate 1, and the flexible connector 4 closes the first mounting channel 2. At this time, the second hot end component 11 is adapted to be sealed to the connecting plate 1 by fasteners or welded parts, and the second hot end component 11 closes the second mounting channel 3.

[0051] Fasteners can be used to secure the second hot end component 11 to the connecting plate 1 by means of screws, bolts, etc., or they can be used to secure the connection between the second hot end component 11 and the connecting plate 1 by welding.

[0052] During the cooling process, the second cold head 13 and the component 8 to be cooled are directly connected through the heat conduction unit 5. After the first and second refrigeration units are started, the temperatures of the high-temperature component 7, the component 8 to be cooled, the first low-temperature component 9, the first cold head 10, the second low-temperature component 12, and the second cold head 13 gradually decrease. At this time, through the heat conduction effect of the heat conduction unit 5, the temperature of the component 8 to be cooled is forcibly cooled to a temperature similar to that of the second cold head 13. As the temperature decreases, the dimensions of the above components (high-temperature component 7, component 8 to be cooled, first low-temperature component 9, first cold head 10, second low-temperature component 12, and second cold head 13) shrink, specifically in the axial direction ( Figure 1 (up and down direction) and radial direction ( Figure 1 The shrinkage occurs in the left and right directions of the components. Since the material composition and size of the above components are different, the amount of shrinkage will also be different. When the above components shrink, the flexible connector 4 located between the first hot end component 6 and the connecting plate 1 can shrink accordingly, so that the flexible connector 4 can play the role of shrinkage compensation. That is to say, the flexible connector 4 can compensate for the shrinkage caused by the temperature drop in the axial and radial directions, which can avoid large thermal stress and serious deformation of components, thereby avoiding the occurrence of failure.

[0053] During the heating process, which is the opposite of the aforementioned cooling process, the first and second refrigeration units are shut down. The aforementioned components will begin to heat up, resulting in thermal expansion. During the thermal expansion, the flexible connector 4 located between the first hot end component 6 and the connecting plate 1 will expand accordingly, thereby enabling the flexible connector 4 to compensate for the expansion. In other words, the flexible connector 4 can compensate for the expansion caused by the temperature rise in both the axial and radial directions, thereby preventing malfunctions.

[0054] In another embodiment of the present invention, the flexible connector 4 is adapted to be sleeved on the outside of the second low-temperature end component 12, one end of the flexible connector 4 is sealed to the second hot end component 11, the other end of the flexible connector 4 is sealed to the connecting plate 1, and the flexible connector 4 closes the second mounting channel 3. At this time, the first hot end component 6 is adapted to be sealed to the connecting plate 1 by fasteners or welded parts, and the first hot end component 6 closes the first mounting channel 2.

[0055] Fasteners can be used to secure the connection between the first hot end component 6 and the connecting plate 1 by means of screws, bolts, etc., or by welding.

[0056] During the cooling process, the second cold head 13 and the component 8 to be cooled are directly connected through the heat conduction unit 5. After the first and second refrigeration units are started, the temperatures of the high-temperature component 7, the component 8 to be cooled, the first low-temperature component 9, the first cold head 10, the second low-temperature component 12, and the second cold head 13 gradually decrease. At this time, through the heat conduction effect of the heat conduction unit 5, the temperature of the component 8 to be cooled is forcibly cooled to a temperature similar to that of the second cold head 13. As the temperature decreases, the dimensions of the above components shrink, specifically in the axial direction ( Figure 2 (up and down direction) and radial direction ( Figure 2 The shrinkage occurs in the left and right directions of the components. Since the material composition and size of the above components are different, the amount of shrinkage will also be different. When the above components shrink, the flexible connector 4 located between the second hot end component 11 and the connecting plate 1 can shrink accordingly, so that the flexible connector 4 can play the role of shrinkage compensation. That is to say, the flexible connector 4 can compensate for the shrinkage caused by the temperature drop in the axial and radial directions, which can avoid large thermal stress and serious deformation of the components, thereby avoiding the occurrence of failure.

[0057] During the heating process, which is the opposite of the aforementioned cooling process, the first and second refrigeration units are shut down. The aforementioned components will begin to heat up, resulting in thermal expansion. During the thermal expansion, the flexible connector 4 located between the second hot end component 11 and the connecting plate 1 will expand accordingly, thereby enabling the flexible connector 4 to compensate for the expansion. In other words, the flexible connector 4 can compensate for the expansion caused by the temperature rise in both the axial and radial directions, thereby preventing malfunctions.

[0058] According to the embodiment of the application, the first refrigeration unit is a low-temperature stage refrigeration machine, the first hot end component 6 is a low-temperature stage refrigeration machine hot end flange, the high-temperature end component 7 is a low-temperature stage refrigeration machine high-temperature end component, the position to be cooled component 8 is a low-temperature stage refrigeration machine position to be cooled flange, the first low-temperature end component 9 is a low-temperature stage refrigeration machine low-temperature end component, and the first cold head 10 is a low-temperature stage refrigeration machine cold head. The second refrigeration unit is a precooling stage refrigeration machine, the second hot end component 11 is a precooling stage refrigeration machine hot end flange, the second low-temperature end component 12 is a precooling stage refrigeration machine low-temperature end component, and the second cold head 13 is a precooling stage refrigeration machine cold head. The heat conduction unit 5 is a thermal bridge. The connecting plate 1 is a vacuum cover flange. It can be understood that the refrigeration machine further comprises a vacuum cover, which is sleeved on one end of the low-temperature side and connected with the vacuum cover flange, so that the high-temperature end component 7, the position to be cooled component 8, the first low-temperature end component 9, the first cold head 10, the second low-temperature end component 12 and the second cold head 13 are located in the vacuum cover.

[0059] It can be understood that the low-temperature stage refrigeration machine hot end flange and the precooling stage refrigeration machine hot end flange are located on the room temperature side of the vacuum cover flange, the first mounting channel 2 is used to mount the low-temperature stage refrigeration machine high-temperature end component, the low-temperature stage refrigeration machine position to be cooled flange, the low-temperature stage refrigeration machine low-temperature end component and the low-temperature stage refrigeration machine cold head on the low-temperature side of the vacuum cover flange, and the second mounting channel 3 is used to mount the precooling stage refrigeration machine low-temperature end component and the precooling stage refrigeration machine cold head on the low-temperature side of the vacuum cover flange. The thermal bridge is used to conduct heat and connect the precooling stage refrigeration machine cold head and the low-temperature stage refrigeration machine position to be cooled flange. During the cooling process, the precooling stage refrigeration machine cold head can forcibly cool the temperature at the low-temperature stage refrigeration machine position to be cooled flange to a temperature close to that of the precooling stage refrigeration machine cold head, thereby completing the refrigeration to meet the refrigeration demand.

[0060] Through the above arrangement, the redundant connection mechanism can be avoided on the thermal bridge, the low-temperature contact thermal resistance and the heat transfer temperature difference are reduced, the refrigeration performance of the refrigeration machine can be effectively improved, and through the installation of the flexible connecting piece 4, the problems of excessive stress or size deformation of components caused by thermal expansion and cold contraction after temperature change can be avoided, and the long-term reliable operation of the refrigeration machine is ensured.

[0061] The flexible connecting piece 4 is one of a bellows, a metal hose and a corrugated compensator.

[0062] The first refrigeration unit and the second refrigeration unit are one of a pulse tube refrigeration machine, a Stirling refrigeration machine and a Gifford-McMahon refrigeration machine. Or a composite refrigeration device composed of at least two of a pulse tube refrigeration machine, a Stirling refrigeration machine and a Gifford-McMahon refrigeration machine.

[0063] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigeration machine, characterized in that, include: First refrigeration unit, second refrigeration unit, connecting plate and flexible connector; The connecting plate has a room temperature side and a low temperature side on its two sides, respectively; The first refrigeration unit is connected to the connecting plate, and the two ends of the first refrigeration unit are respectively located on the room temperature side and the low temperature side; The second refrigeration unit is connected to the connecting plate, and the two ends of the second refrigeration unit are respectively located on the room temperature side and the low temperature side; The flexible connector is disposed on the room temperature side, one end of the flexible connector is connected to the first refrigeration unit or the second refrigeration unit, and the other end of the flexible connector is connected to the connecting plate; The connecting plate is provided with a first mounting channel and a second mounting channel; the first refrigeration unit is adapted to pass through the first mounting channel so that its two ends are respectively located on the room temperature side and the low temperature side; the second refrigeration unit is adapted to pass through the second mounting channel so that its two ends are respectively located on the room temperature side and the low temperature side; the first refrigeration unit includes, in sequence, a first hot end component, a high temperature end component, a component to be cooled, a first low temperature end component, and a first cold head; the first hot end component is located on the room temperature side; the high temperature end component is adapted to pass through the first mounting channel; the component to be cooled, the first low temperature end component, and the first cold head are all located on the low temperature side; The second refrigeration unit includes, in sequence: a second hot end component, a second low-temperature end component, and a second cold head; the second hot end component is located on the room temperature side; the second low-temperature end component is adapted to pass through the second mounting channel; The second cold head is located on the low-temperature side; The first cold head has a slot-shaped structure, and the refrigerator also includes a heat-conducting unit. The second cold head and the component to be cooled are directly connected through the heat-conducting unit.

2. The refrigeration machine according to claim 1, characterized in that, When one end of the flexible connector is connected to the first refrigeration unit, the flexible connector is adapted to be sleeved on the outside of the high-temperature end component, one end of the flexible connector is sealed to the first hot end component, the other end of the flexible connector is sealed to the connecting plate, and the flexible connector closes the first installation channel.

3. The refrigeration machine according to claim 1, characterized in that, When one end of the flexible connector is connected to the second refrigeration unit, the first hot end component is adapted to be sealed to the connecting plate by fasteners or welded parts, and the first hot end component closes the first mounting channel.

4. The refrigeration machine according to claim 1, characterized in that, When one end of the flexible connector is connected to the second refrigeration unit, the flexible connector is adapted to be sleeved on the outside of the second low-temperature end component, one end of the flexible connector is sealed to the second hot end component, the other end of the flexible connector is sealed to the connecting plate, and the flexible connector closes the second installation channel.

5. The refrigeration machine according to claim 1, characterized in that, When one end of the flexible connector is connected to the first refrigeration unit, the second hot end component is adapted to be sealed to the connecting plate by fasteners or welded parts, and the second hot end component closes the second mounting channel.

6. The refrigeration machine according to claim 1, characterized in that, The two ends of the heat-conducting unit are rigidly connected to the component to be cooled and the second cold head, respectively.

7. The refrigeration machine according to claim 1, characterized in that, The component to be cooled, the heat-conducting unit, and the second cold head are integrally formed.

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