Quick replacement structure of low-temperature refrigerator
By designing heat-conducting components and bellows, the problems of efficient heat transfer and flexible coupling between the cryogenic refrigerator and the Dewar were solved, enabling rapid replacement of the refrigerator and maintenance of system efficiency.
Patent Information
- Application Number
- CN202520247152.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-17
AI Technical Summary
In existing technologies, the connection structure between the cryogenic refrigerator and the Dewar cannot simultaneously achieve efficient heat transfer and flexible coupling, resulting in the inability to quickly replace the refrigerator when it fails, thus affecting system efficiency.
The first and second heat-conducting components are detachably connected, forming a low-temperature refrigeration chamber and a Dewar chamber on the inner side of the cylinder. The bellows is sealed on the outer periphery of the cylinder, and the flexible coupling is adjusted by the constraint component to achieve efficient heat transfer and mechanical coupling.
It enables rapid replacement of cryogenic refrigerators, avoids damaging the Dewar vacuum, ensures heat transfer efficiency and mechanical coupling effect, and reduces heat loss.
Smart Images
Figure CN223596233U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to low temperature technical field especially relates to a low temperature refrigerator quick replacement structure. BACKGROUND
[0002] The microwave surface resistance of high-temperature superconducting thin film is smaller than conventional metal by nearly 3 orders of magnitude, and the microwave device made therefrom has the advantages of low insertion loss, high frequency selectivity, and steep passband edge, such as being applied to a receiving front end, the receiver will have an extremely low noise figure, and the sensitivity and selectivity are greatly improved. At present, the receiving front end subsystem composed of a high-temperature superconducting filter, a low-temperature low-noise amplifier, and a refrigerator has been used in civil communication (mobile communication base station, radio astronomy, etc.) and military communication (radar, measurement and control, etc.) fields, and has good economic and social benefits.
[0003] In view of the high dependence of the high-temperature superconducting microwave receiving front end on the low-temperature environment, the service life and reliability of the cold source are particularly important. The commonly used cold source is a gas bearing Stirling refrigerator or a Stirling type pulse tube refrigerator, both of which have large cooling capacity, small volume, and light weight. In order to reduce the heat loss, the refrigerator is often welded and integrated with the dewar, and the defects of this structure are that once the refrigerator fails, the whole system is scrapped because the cold source cannot be replaced for maintenance, and at the same time the vacuum of the dewar needs to be destroyed to take out the internal device, which greatly affects the working efficiency of the receiving front end.
[0004] In order to realize the connection of the refrigerator and the dewar, the prior art usually adopts a direct coupling structure or an indirect coupling structure. The direct coupling structure can directly contact the cold head of the refrigerator with the cold guide structure of the dewar, and high-efficiency heat transfer can be realized with the aid of thermal interface material, but precise structure design and processing are needed to ensure appropriate coupling compression, otherwise the cold head of the refrigerator will be deformed and damaged under long-term extrusion if the coupling compression is too large, or the interface contact thermal resistance will be increased if the coupling compression is too small, which will affect the cooling effect. The indirect coupling structure realizes mechanical coupling by setting a flexible transition piece between the cold head of the refrigerator and the cold guide structure of the dewar, which increases the fault tolerance of the structure, but the increase of the heat transfer link will affect the refrigeration effect and increase the system complexity.
[0005] Therefore, how to provide a low-temperature refrigerator quick replacement structure that takes into account high-efficiency heat transfer and flexible coupling is a technical problem that technicians in the field need to solve. Utility model content
[0006] The utility model provides a low-temperature refrigerator quick replacement structure to solve the defects that high-efficiency heat transfer and flexible coupling cannot be taken into account in the prior art, and realizes the quick replacement of the refrigerator.
[0007] The utility model provides a kind of low-temperature refrigerator quick replacement structure, for realizing the heat conduction of device and low-temperature refrigerator, the device is placed in Dewar, and the quick replacement structure includes:
[0008] First heat conduction piece, with the cold head of the low-temperature refrigerator is connected;
[0009] Second heat conduction piece, with the first heat conduction piece is detachably connected;And the second heat conduction piece is used to be connected with the device;
[0010] Cylinder, open top and bottom, top end is embedded and connected the second heat conduction piece;The first heat conduction piece is located in the inside of the cylinder;The low-temperature refrigerator cold head penetrates the bottom end of the cylinder;The inside of the cylinder forms low-temperature refrigerator cavity, and the outside of the cylinder is Dewar cavity;
[0011] Bellows, sealing is arranged on the circumference of the cylinder.
[0012] According to the low-temperature refrigerator quick replacement structure provided by the utility model, still include first transition piece, the cylinder includes:
[0013] Inner cylinder, inside is provided with the first heat conduction piece and the second heat conduction piece, and the inner cylinder is connected with the second heat conduction piece;And the bottom end of the inner cylinder is integrally extended with outer ring outward;
[0014] Outer cylinder, the inside of bottom end is sealingly connected with the outer ring, the top end of the outer cylinder is connected with first transition piece, and the bottom end of the outer cylinder is suspended.
[0015] According to the low-temperature refrigerator quick replacement structure provided by the utility model, still include:
[0016] Second transition piece and connecting blind plate, all be located at the bottom end of the outside of the outer cylinder, and the second transition piece is used for the bellows and the connecting blind plate sealing connection.
[0017] According to the low-temperature refrigerator quick replacement structure provided by the utility model, the first transition piece and the second transition piece are all sealed by silver welding between the bellows.
[0018] According to the low-temperature refrigerator quick replacement structure provided by the utility model, still include KF joint, the bottom side of the connecting blind plate is connected with the KF joint, and the KF joint is connected with the low-temperature refrigerator.
[0019] According to the low-temperature refrigerator quick replacement structure provided by the utility model, the KF joint is connected with suction pipe.
[0020] According to the low-temperature refrigerator quick replacement structure provided by the utility model, annular gap between the low-temperature refrigerator cold head and the inner cylinder is filled with heat insulation material.
[0021] The low-temperature refrigerator quick replacement structure further comprises a plurality of constraint members, the constraint members are distributed on the outer periphery of the bellows, and two ends of each constraint member are connected with the first transition member and the connecting blind plate respectively.
[0022] The low-temperature refrigerator quick replacement structure further comprises a plurality of constraint members, the constraint members are distributed on the outer periphery of the bellows, and two ends of each constraint member are connected with the first transition member and the connecting blind plate respectively.
[0023] A pair of fixed nuts are fixedly arranged on the first transition member and the connecting blind plate respectively;
[0024] A pair of fixed nuts are fixedly arranged on the first transition member and the connecting blind plate respectively;
[0025] A pair of movable nuts are adaptively connected with the top end and the bottom end of the lead screw respectively.
[0026] The low-temperature refrigerator quick replacement structure further comprises a plurality of constraint members, the constraint members are distributed on the outer periphery of the bellows, and two ends of each constraint member are connected with the first transition member and the connecting blind plate respectively.
[0027] The low-temperature refrigerator quick replacement structure comprises a first heat-conducting member, a second heat-conducting member, a cylinder, a low-temperature refrigerator cold head and a bellows.
[0028] The two ends of the constraint member are connected with the first transition member and the connecting blind plate respectively, so that the deformation of the two cavities caused by the excessive pressure difference between the inside and the outside during replacement is prevented.
[0029] The long path of the inner cylinder and the outer cylinder can reduce the solid heat conduction heat loss at the cold head.
[0030] The vacuum degree of the cavity where the low-temperature refrigerator is located can be adjusted individually to reduce the residual gas leakage heat of the annular gap as much as possible.
[0031] The combination of the fixed nut, the lead screw and the movable nut can realize the expansion and contraction adjustment and constraint support of the flexible bellows, and can prevent the structure from being deformed due to the excessive pressure difference between the inside and the outside during replacement. BRIEF DESCRIPTION OF DRAWINGS
[0032] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described in the following are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on these drawings.
[0033] Figure 1 It is the installation schematic diagram of the low-temperature refrigerator quick replacement structure provided by the present application.
[0034] Figure 2 It is the sectional view of the low-temperature refrigerator quick replacement structure provided by the present application.
[0035] Figure 3 It is the appearance schematic diagram of the low-temperature refrigerator quick replacement structure provided by the present application.
[0036] Reference signs:
[0037] 1, first heat-conducting part; 2, second heat-conducting part; 3, cylinder; 4, corrugated pipe; 5, constraint part; 6, first transition part; 7, second transition part; 8, connecting blind plate; 9, KF joint; 10, suction pipe; 31, inner cylinder; 32, outer ring; 33, outer cylinder; 51, fixed nut; 52, screw rod; 53, movable nut; 100, low-temperature refrigerator; 200, dewar; 61, first vertical part; 62, horizontal part; 63, second vertical part. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will combine the drawings in the present application to clearly and completely describe the technical solutions in the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.
[0039] In the description of the embodiments of the present application, it should be noted that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0040] The low-temperature refrigerator quick replacement structure is described below. Figures 1-3 The low-temperature refrigerator quick replacement structure is described below.
[0041] As Figure 1 shown, the low-temperature refrigerator quick replacement structure is provided to solve the problem that the high-temperature superconducting microwave receiving front-end cold source fault cannot be repaired and replaced in the prior art, while taking into account efficient heat transfer and flexible coupling, and realizing replacement of the low-temperature refrigerator without damaging the Dewar vacuum.
[0042] The low-temperature refrigerator quick replacement structure provided by the embodiment of the utility model realizes efficient heat transfer and flexible coupling of the Dewar where the device is located and the low-temperature refrigerator, and at the same time, the Dewar where the device is located and the low-temperature refrigerator are isolated into two cavities in space, and the vacuum does not interfere with each other.
[0043] As Figure 2 and Figure 3 shown, the low-temperature refrigerator quick replacement structure is provided to solve the problem that the high-temperature superconducting microwave receiving front-end cold source fault cannot be repaired and replaced in the prior art, while taking into account efficient heat transfer and flexible coupling, and realizing replacement of the low-temperature refrigerator without damaging the Dewar vacuum.
[0044] The first heat-conducting member 1 is installed on the cold head of the low-temperature refrigerator, and the second heat-conducting member 2 is detachably connected with the first heat-conducting member 1, usually through threaded connection for close cooperation, to realize efficient heat transfer. The second heat-conducting member 2 is used for connecting with the device in the Dewar, and the specific installation mode can be that a threaded hole is left on the second heat-conducting member 2, and the threaded hole is connected with the device. When the area of the device is greater than the area of the second heat-conducting member 2 or there is a special installation position requirement, a cold conduction structure can also be arranged between the device and the second heat-conducting member 2 to improve the cold conduction efficiency.
[0045] The cylinder body 3 is open at the top and bottom, and the second heat-conducting member 2 is embedded at the top end, and the cylinder body 3 is connected with the second heat-conducting member 2; the first heat-conducting member 1 is located on the inner side of the cylinder body 3; the cold head of the low-temperature refrigerator penetrates the bottom end of the cylinder body 3 and is connected with the first heat-conducting member 1; the inner side of the cylinder body 3 forms a low-temperature refrigerator cavity, and the outer side of the cylinder body 3 is a Dewar cavity. The arrangement of the cylinder body 3 realizes isolation and sealing of the Dewar cavity where the device is located and the low-temperature refrigerator cavity, at the same time, the heat conduction path is lengthened, and the solid conduction heat leakage of the first heat-conducting member 1 and the second heat-conducting member 2 is reduced.
[0046] The two ends of the corrugated pipe 4 are sealingly arranged on the outer periphery of the cylinder body 3, and the middle section of the corrugated pipe 4 is telescopic and movable, to ensure the coupling allowance, at the same time, the heat conduction path is lengthened, and the solid conduction heat leakage is reduced.
[0047] The low-temperature refrigerator quick replacement structure provided by the embodiment of the utility model can complete the replacement of the low-temperature refrigerator within several minutes without damaging the Dewar vacuum where the device is located; the threaded cooperation of the first heat-conducting part 1 and the second heat-conducting part 2 can realize the close contact and efficient heat transfer of the low-temperature refrigerator 100 and the device; the expansion characteristic of the bellows 4 can realize the suitable mechanical coupling of the low-temperature refrigerator 100 and the Dewar where the device is located.
[0048] It should be noted that the first heat-conducting part 1 and the second heat-conducting part 2 are usually made of red copper, which has good heat conduction effect.
[0049] When the flexible bellows is adopted, in order to better realize the sealed connection between the bellows 4 and the cylinder body 3, in one feasible embodiment of the utility model, a first transition part 6 is further included, the cylinder body 3 includes an inner cylinder 31 and an outer cylinder 33, the inner side of the inner cylinder 31 is provided with the first heat-conducting part 1 and the second heat-conducting part 2, and the inner cylinder 31 is connected with the second heat-conducting part 2, and the inner cylinder 31 is not connected with the first heat-conducting part 1. The bottom end of the inner cylinder 31 integrally extends outwardly with an outer ring 32. The inner side of the bottom end of the outer cylinder 33 is sealingly connected with the outer ring 32. The top end of the outer cylinder 33 is sealingly connected with the first transition part 6, and the bottom end of the outer cylinder 33 is suspended. The long path of the gap between the inner cylinder 31 and the outer cylinder 33 can also reduce the solid heat conduction heat leakage at the cold head.
[0050] Furthermore, the inner cylinder 31 is silver soldered with the second heat-conducting part 2, the outer cylinder 33 is argon arc welded with the outer ring 32, and the outer cylinder 33 is also argon arc welded with the first transition part 6.
[0051] The bellows 4 can adopt a flexible bellows or a customized disc-shaped bellows, and when the customized disc-shaped bellows is adopted, the disc-shaped bellows can be directly welded and connected with the outer cylinder 33 and the connecting blind plate 8.
[0052] In one feasible embodiment of the utility model, a second transition part 7 and a connecting blind plate 8 are further included, which are located at the bottom end of the outer side of the outer cylinder 33, the second transition part 7 is located at the top side of the connecting blind plate 8, and the second transition part 7 is used for the sealed connection of the bellows 4 and the connecting blind plate 8.
[0053] More specifically, the first transition part 6 and the second transition part 7 are sealingly silver soldered with the bellows 4, the middle segment of the bellows 4 is flexibly movable, the coupling allowance is ensured, the heat conduction path is prolonged, and the solid conduction heat leakage is reduced.
[0054] Further, the first transition piece 6 is annular, and the first transition piece 6 comprises a first vertical part 61, a horizontal part 62 and a second vertical part 63, the inner periphery of the first vertical part 61 is welded with the outer side of the outer cylinder 33; the horizontal part 62 is connected perpendicularly with the first vertical part 61; the second vertical part 63 is connected perpendicularly with one end of the horizontal part 62 which is away from the first vertical part 61, and the second vertical part 63 and the first vertical part 61 are distributed on both sides of the horizontal part 62. The horizontal part 62 and the second vertical part 63 are both welded and fixed with the bellows 4. Through the above structural arrangement, the isolation and sealing of the dewar cavity and the cryogenic refrigerator cavity can be better realized.
[0055] In addition, the second transition piece 7 is the same as the first transition piece 6 in shape, and the difference lies in that the first vertical part of the second transition piece 7 is not connected with the outer cylinder 33, and the outer side is welded and connected with the inner periphery of the connecting blind plate 8.
[0056] In a feasible embodiment of the utility model, still include KF joint 9, the bottom side of connecting blind plate 8 is welded and connected with KF joint 9, and KF joint 9 is connected and sealed with cryogenic refrigerator through the clamp.
[0057] In a feasible embodiment of the utility model, the KF joint 9 is connected with the gas extraction pipe 10, and the gas extraction pipe 10 is welded with the reserved hole position of the KF joint 9, so that the adjustment of the vacuum degree of the cryogenic refrigerator cavity can be realized by the external gas extraction pump.
[0058] Among them, the first transition piece 6, the second transition piece 7 and the gas extraction pipe 10 all preferably adopt stainless steel parts.
[0059] In another feasible embodiment of the utility model, in the occasion that the control requirements for cooling time or residual gas heat leakage are not high, the gas extraction pipe need not be arranged, and the annular gap between the cold head of the cryogenic refrigerator and the inner cylinder 31 can be filled with the heat insulation material, so that the operation convenience is improved.
[0060] Through the above two embodiments, the residual gas heat leakage of the annular gap can be reduced as much as possible.
[0061] In a feasible embodiment of the utility model, still include constraint piece 5, and the two ends of constraint piece 5 are connected with the first transition piece 6 and the connecting blind plate 8 respectively, constraint piece 5 can guarantee the appropriate heat transfer and mechanical coupling effect, and prevent the deformation caused by the excessive pressure difference between the two cavities during replacement.
[0062] The constraint piece 5 is provided with multiple groups, and the multiple groups of constraint piece 5 are distributed on the outer periphery of the bellows 4, so that the uniform constraint on the bellows 4 can be realized through the arrangement of the multiple groups of constraint piece 5.
[0063] In a feasible embodiment of the utility model, each set of constraint 5 includes a pair of fixed nut 51, a screw rod 52 and a pair of movable nut 53, a pair of fixed nut 51 is fixedly arranged on first transition piece 6 and connecting blind plate 8 respectively;Screw rod 52 is inserted into the inner side of a pair of fixed nut 51;A pair of movable nut 53 is connected with the top end and bottom end of screw rod 52 respectively.The movable nut 53 at the upper end realizes distance adjustment function, and the movable nut 53 at the lower end is stacked with its corresponding fixed nut 51, so that the screw rod 52 has certain insertion depth constraint.
[0064] In order to facilitate operation, in a feasible embodiment of the utility model, the model of fixed nut 51 is slightly larger than screw rod 52 and movable nut 53 (for example, screw rod 52 and movable nut 53 adopt M3, and fixed nut 51 adopts M4), through the adjustment of movable nut 53, the control of flexible bellows compression amount is realized, and the appropriate heat transfer and mechanical coupling effect are guaranteed;Through the constraint of fixed nut 51, the deformation caused by excessive pressure difference between the inside and outside of the two cavities during replacement is prevented.
[0065] The use method of the quick replacement structure of the low-temperature refrigerator provided by the utility model is as follows:
[0066] (1) the vacuum degree of the dewar 200 where the device is located and the cavity of the low-temperature refrigerator 100 is pumped to 10 Pa or below by a molecular pump unit, and then the pumping pipeline is cut off and sealed; -3
[0067] (2) start the low-temperature refrigerator 100, reduce the temperature of the device side to below the superconducting transition temperature and keep stable, and the device enters the working state;
[0068] (3) if the low-temperature refrigerator 100 fails and stops, cut off all communications, loosen the KF clamp at the quick replacement structure of the low-temperature refrigerator, and unscrew the dewar where the device is located from the fault refrigerator by rotating;
[0069] (4) prepare a new refrigerator, and screw the dewar where the device is located and the low-temperature refrigerator together through the threaded connection of the first heat-conducting member and the second heat-conducting member;
[0070] (5) connect the communication and the refrigerator pumping pipeline to pump, and start the new refrigerator at the same time;
[0071] (6) cut off the pumping pipeline and seal it, and when the device side returns to below the superconducting transition temperature, re-enter the working state.
[0072] The quick replacement structure of the low-temperature refrigerator provided by the utility model can be used for any refrigeration field requiring quick replacement, and is not limited to the application of high-temperature superconducting microwave receiving front end.
[0073] The low-temperature refrigerator can be a Stirling type pulse tube refrigerator or a gas bearing Stirling refrigerator.
[0074] In the description of the embodiments of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, 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 ordinary 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.
[0075] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "way", "specific way" or "some ways" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or way are included in at least one embodiment or way of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or way. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or ways in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or features of the different embodiments or ways described in the present application without contradiction.
[0076] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; 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 quick-change structure for a cryogenic refrigerator, used to achieve heat conduction between a device and a cryogenic refrigerator (100), the device being placed inside a Dewar (200), characterized in that, The quick-change structure includes: The first heat-conducting component (1) is connected to the cold head of the cryogenic refrigerator (100); The second heat-conducting component (2) is detachably connected to the first heat-conducting component (1); and the second heat-conducting component (2) is used to connect to the device. The cylinder (3) has openings at the top and bottom, and the top end is fitted with a connection to the second heat-conducting component (2); the first heat-conducting component (1) is located inside the cylinder (3); the cold head of the low-temperature refrigerator penetrates through the bottom end of the cylinder (3); the inner side of the cylinder (3) forms the low-temperature refrigerator cavity, and the outer side of the cylinder (3) is the Dewar cavity; A bellows (4) is sealed on the outer periphery of the cylinder (3).
2. The rapid replacement structure for a cryogenic refrigeration unit according to claim 1, characterized in that, It also includes a first transition member (6), and the cylinder (3) includes: The inner cylinder (31) is provided with the first heat-conducting component (1) and the second heat-conducting component (2) on its inner side, and the inner cylinder (31) is connected to the second heat-conducting component (2); and the bottom end of the inner cylinder (31) is integrally extended outward with an outer ring (32). The inner side of the bottom end of the outer cylinder (33) is sealed to the outer ring (32), the top end of the outer cylinder (33) is connected to the first transition piece (6), and the bottom end of the outer cylinder (33) is suspended.
3. The rapid replacement structure for the cryogenic refrigerator according to claim 2, characterized in that, Also includes: The second transition piece (7) and the connecting blind plate (8) are both located at the bottom of the outer side of the outer cylinder (33), and the second transition piece (7) is used for sealing connection between the bellows (4) and the connecting blind plate (8).
4. The rapid replacement structure for the cryogenic refrigerator according to claim 3, characterized in that, The first transition piece (6) and the second transition piece (7) are both sealed to the bellows (4) by silver soldering.
5. The rapid replacement structure for a cryogenic refrigerator according to claim 3, characterized in that, It also includes a KF connector (9), the bottom side of the connecting blind plate (8) is connected to the KF connector (9), and the KF connector (9) is connected to the cryogenic refrigerator.
6. The rapid replacement structure for a cryogenic refrigerator according to claim 5, characterized in that, The KF connector (9) is connected to an air extraction pipe (10).
7. The rapid replacement structure for a cryogenic refrigerator according to claim 5, characterized in that, The annular gap between the cold head of the cryogenic refrigerator (100) and the inner cylinder (31) is filled with insulating material.
8. The rapid replacement structure for a cryogenic refrigeration unit according to claim 5, characterized in that, It also includes a constraint member (5), which is provided in multiple sets. The multiple sets of constraint members (5) are distributed on the outer periphery of the bellows (4), and the two ends of each set of constraint members (5) are respectively connected to the first transition member (6) and the connecting blind plate (8).
9. The rapid replacement structure for a cryogenic refrigerator according to claim 8, characterized in that, Each set of the constraints (5) includes: A pair of fixing nuts (51) are respectively fixed on the first transition piece (6) and the connecting blind plate (8); The lead screw (52) is inserted into the inside of a pair of fixing nuts (51); A pair of movable nuts (53) are respectively adapted to the top and bottom ends of the lead screw (52).
10. The rapid replacement structure for a cryogenic refrigerator according to claim 9, characterized in that, The fixed nut (51) is larger than the lead screw (52) and the movable nut (53).