Flexible connection pluggable cold head container structure

Abstract

The utility model discloses a flexible connection pluggable cold head container structure, and relates to the superconducting magnet refrigeration technology. Comprising a magnet Dewar vacuum cavity and an independent cold head container vacuum cavity; the cold head container assembly is connected with a first multi-stage cold seat and a second multi-stage cold seat through a first-stage thin-walled pipe, a second-stage thin-walled pipe and a flexible corrugated pipe correspondingly, flexible displacement compensation of axial cold shrinkage of the refrigerator cold head is achieved in combination with a spring pre-tightening structure, and it is ensured that the cold energy transmission contact face is tight. The refrigerating machine assembly is quickly inserted and pulled out through the bolt and the compression spring, the vacuum cavity of the cold head container is isolated from the vacuum cavity of the magnet Dewar during disassembly and assembly, the vacuum cavity of the magnet Dewar does not need to be damaged, the low-temperature state of the magnet does not need to be damaged, the replacement and work period is greatly shortened, and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to superconducting magnet refrigeration technology, concretely is a kind of flexible connection pluggable cold head container structure. BACKGROUND

[0002] The existing magnet refrigeration assembly is mostly fixed structure, and the magnet refrigerator is difficult to replace, with large workload, long cold head replacement and maintenance period, and the magnet needs to be rewarming, vacuum breaking and cutting for maintenance, and then reassembled, welded, vacuumed and cooled down.The whole working cycle is long, the workload is large, and the magnet may be damaged to some extent;

[0003] And the existing pluggable cold head container structure mostly adopts plane contact type installation, and increases flexible contact by indium pad or indium welding between primary heat transfer block and primary cold seat, which needs to replace and process indium pad every time to ensure the elasticity of indium layer when replacing the refrigeration unit, and the secondary installation is also mostly in this form, which is more complicated to operate, and the cold head contact piece will be cold contracted during magnet cooling, causing contact disengagement and forming large contact thermal resistance, affecting cooling realization.Therefore, we provide a kind of flexible connection pluggable cold head container structure. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of flexible connection pluggable cold head container structure to solve the above problems.

[0005] The utility model can be realized by the following technical solutions: a kind of flexible connection pluggable cold head container structure, including by dewar constitutes magnet dewar vacuum cavity and its inside independent cold head container vacuum cavity, the cold head container vacuum cavity is constituted by cold head container assembly, and cold head container assembly is fixed by dewar diameter pipe and dewar welding, forms 300K temperature gradient;

[0006] The primary cold seat of cold head container assembly is bolted to the 50K cold screen in magnet dewar vacuum cavity by primary heat connection, forming 50K temperature gradient;

[0007] The bottom of cold head container assembly is secondary cold seat, and the secondary cold seat is bolted to cold mass magnet, forming 4K temperature gradient;

[0008] Refrigeration unit is installed in the inner cavity of cold head container assembly, and can be detachably fixed by connecting seat assembly;The refrigeration unit includes primary cold head and secondary cold head, and the cold head container assembly includes primary cold seat and secondary cold seat, and the primary cold head of refrigeration unit is conically contacted and matched with primary cold seat by primary heat transfer block, and the secondary cold head of refrigeration unit is conically contacted and matched with secondary cold seat by secondary heat transfer block assembly.

[0009] The further technical improvement of the utility model lies in: the connecting seat component includes a refrigerator connecting seat, the refrigerator component is elastically connected with the cold head container seat of the cold head container component through connecting bolts and compression springs, and is provided with an O-ring seal.

[0010] The further technical improvement of the utility model lies in: in the cold head container component, the first-stage cold seat is connected with the cold head container seat through a first-stage thin-wall pipe by brazing.

[0011] The further technical improvement of the utility model lies in: in the cold head container component, the second-stage cold seat is connected with the first-stage cold seat through a second-stage thin-wall pipe and a flexible bellows connected in sequence, the second-stage thin-wall pipe and the flexible bellows are sealedly welded, and the connecting ends of the two and the corresponding cold seat are sealedly brazed.

[0012] The further technical improvement of the utility model lies in: the second-stage heat transfer block component includes a second-stage cold head connecting block, the bottom of the second-stage cold head connecting block is fixed with a plurality of connecting guide shafts, the bottom of the plurality of connecting guide shafts is commonly and slidably connected with a second-stage conical heat transfer block, and the outer periphery of each connecting guide shaft is sleeved with a second-stage flexible spring abutting against the second-stage cold head connecting block and the second-stage conical heat transfer block at two ends.

[0013] The further technical improvement of the utility model lies in: a flexible thermal connection is further arranged between the second-stage conical heat transfer block and the second-stage cold head connecting block, and a second-stage cold head radiation shield is further arranged outside the second-stage heat transfer block component.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The refrigerator component and the cold head container component are connected through elastic bolts and conical contact, and only the connecting bolts need to be adjusted to quickly disassemble and assemble, the vacuum cavity of the cold head container and the magnet Dewar vacuum cavity are independently designed, the O-ring and the brazing / sealing welding process are combined to ensure the integrity of the vacuum cavity during disassembly and assembly, the magnet Dewar vacuum cavity does not need to be damaged, the low-temperature state of the magnet does not need to be damaged, the replacement and working periods are greatly shortened, and the energy consumption is reduced.

[0016] 2. The flexible connection is adopted, the first-stage heat transfer block and the first-stage cold seat are adjusted through the refrigerator connecting seat, the extension spring and the bolt to solve the cold shrinkage separation problem in the cooling process, the second-stage heat transfer block component and the second-stage cold seat are connected through the flexible structure between the condensers to realize the cold shrinkage compensation in the cooling process, the flexible thermal connection is adopted in the second-stage heat transfer block component to complete the cold source transmission, the connecting guide shaft and the second-stage extension spring are adopted to complete the axial cold shrinkage compensation adjustment, and thus the contact separation caused by the cold shrinkage of the refrigerator cold head in the refrigeration process is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to facilitate the understanding of those skilled in the art, the utility model will be further described in conjunction with the drawings.

[0018] Figure 1 It is the overall installation structure section view schematic diagram of the utility model;

[0019] Figure 2 It is the cold head container vacuum cavity plug before state schematic diagram of the utility model;

[0020] Figure 3 It is the refrigeration machine assembly plug before structure connection schematic diagram of the utility model;

[0021] Figure 4 It is the connecting piece assembly working connection state schematic diagram of the utility model;

[0022] Figure 5 It is the secondary cold head cooling before state schematic diagram of the utility model;

[0023] Figure 6 It is the secondary cold head cooling after state schematic diagram of the utility model.

[0024] In the drawing: 1, refrigeration machine assembly;2, connecting seat assembly;3, cold head container assembly;4, dowa diameter pipe;5, dowa;6, primary heat connection;7, 50K cold screen;8, cold quality magnet;9, cold head container vacuum cavity;10, magnet dowa vacuum cavity;101, primary cold head;102, primary heat transfer block;103, secondary cold head;104, secondary heat transfer block assembly;1041, secondary cold head connecting block;1042, flexible heat connection;1043, connecting guide shaft;1044, secondary conical heat transfer block;1045, secondary cold head radiation shield;1048, secondary flexible spring;201, connecting bolt;202, compression spring;203, O ring;204, refrigeration machine connecting seat;301, cold head container seat;302, primary thin-walled pipe;303, primary cold seat;304, secondary thin-walled pipe;305, flexible bellows;306, secondary cold seat. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model are described in detail as follows by combining with the drawings and preferred embodiments.

[0026] Please refer to Figures 1-6As shown, a flexible connection plug-in cold head container structure includes a magnet Dewar vacuum cavity 10 composed of a Dewar 5 and a cold head container vacuum cavity 9 composed of a cold head container assembly 3, and the cold head container assembly 3 is welded and fixed with the Dewar 5 through a Dewar diameter pipe 4, so as to form a 300K temperature gradient; the middle part of the cold head container assembly 3 is bolted with a 50K cold screen 7 in the magnet Dewar vacuum cavity 10 through a first-level thermal connection, so as to form a 50K temperature gradient; the bottom of the cold head container assembly 3 is a second-level cold seat 306, the second-level cold seat 306 is bolted with a cold mass magnet 8, so as to form a 4K temperature gradient;

[0027] The cold head container assembly 3 includes a cold head container seat 301, a first-level cold seat 303 and a second-level cold seat 306, the cold head container seat 301 is fixed with the Dewar diameter pipe 4, and the cold head container seat 301 and the first-level cold seat 303 below are connected through a first-level thin-walled pipe 302 and a first-level cold seat 303 brazing connection to ensure the structural strength and reduce heat leakage; the first-level cold seat 303 and the second-level cold seat 306 are sequentially connected with a second-level thin-walled pipe 304 and a flexible bellows 305, which can not only reduce heat leakage, but also ensure flexible displacement compensation during the axial cold contraction of the second-level thin-walled pipe 304, and the connection is stable, which ensures the strength of the second-level thin-walled pipe 304; more, the second-level thin-walled pipe 304 and the flexible bellows 305 are sealed and welded, and the connection ends of the two and the corresponding cold seat are sealed and welded by brazing.

[0028] A refrigerator assembly 1 is installed in the inner cavity of the cold head container assembly 3, and the two are fixed through a connecting seat assembly 2, the connecting seat assembly 2 includes a refrigerator connecting seat 204 matched and installed with the cold head container seat 301, and the two are connected through a plurality of connecting bolts 201, the connecting bolts 201 are provided with compression springs 202 outside the periphery to provide pre-tightening force, and O-rings 203 are arranged at the positions where the side walls of the cold head container seat 301 and the refrigerator connecting seat 204 are in contact to provide sealing;

[0029] The first-level cold head 101 of the refrigerator assembly 1 is conically contacted and matched with the first-level cold seat 303 through a first-level heat transfer block 102, and the second-level cold head 103 of the refrigerator assembly 1 is conically contacted and matched with the second-level cold seat 306 through a second-level heat transfer block assembly 104;

[0030] Specifically, the secondary heat transfer assembly 104 comprises a secondary cold head connecting block 1041 kept in abutment at the bottom of the secondary cold head 103, a plurality of connecting guide shafts 1043 are fixed at the bottom of the secondary cold head connecting block 1041, a secondary conical heat transfer block 1044 is slidably connected at the bottom of the plurality of connecting guide shafts 1043, and a secondary flexible spring 1048 is sleeved on the outer periphery of each connecting guide shaft 1043, the two ends of the secondary flexible spring 1048 are in abutment with the secondary conical heat transfer block 1044 and the secondary cold head connecting block 1041 respectively, so that the secondary conical heat transfer block 1044 is always in contact with the secondary cold seat 306; in addition, a flexible heat connection 1042 is arranged between the secondary conical heat transfer block 1044 and the secondary cold head connecting block 1041 to complete the cold source transmission, and a secondary cold head radiation shield 1045 is further arranged outside the secondary heat transfer block assembly 104.

[0031] In the cooling working state of the refrigeration machine, the primary cold head 101 of the refrigeration machine will be axially cold contracted, so that a gap is formed between the primary heat transfer block 102 and the primary cold seat 303, the contact area is reduced, the contact thermal resistance is increased, and the cold quantity transmission is obstructed; at this time, the connecting bolt 201 is screwed in, the compression spring 202 is compressed, and then the primary heat transfer block 102 is compressed axially downward, so that the primary cold seat 303 is in re-compressed contact after cooling, so as to ensure the primary cold conduction and the effective transmission of the cold source.

[0032] Similarly, the secondary cold head 103 of the refrigeration machine will be axially cold contracted, so that a gap is formed between the secondary heat transfer block 1044 and the secondary cold seat 306, the contact area is reduced, the contact thermal resistance is increased, and the cold quantity transmission is obstructed; at this time, under the elastic compensation of the secondary flexible spring 1048 and the guiding action of the connecting guide shaft 1043, the secondary conical heat transfer block 1044 always keeps close contact with the secondary cold seat 306, so as to overcome the contact separation caused by the cold contraction in the refrigeration process of the cold head of the refrigeration machine, and protect the cooling process of the secondary cold head 103.

[0033] Since the connection forms between the primary cold seat 303 and the secondary cold seat 306 of the refrigeration machine assembly 1 and the cold head container assembly 3 are all contact connections, only the connecting bolt 201 on the refrigeration machine connecting seat 204 needs to be adjusted to complete the separation of the refrigeration machine assembly 1 and the cold head container assembly 3, so that the plug-in disassembly of the refrigeration machine is completed; and in the disassembly process, since there is an independent cold head container vacuum cavity 9, the vacuum condition of the magnet Dewar vacuum cavity 10 is not considered to be damaged by the disassembly operation.

[0034] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A flexible connection pluggable cold head container structure, characterized by, The magnet Dewar vacuum cavity (10) is composed of Dewar (5) and its internal independent cold head container vacuum cavity (9), the cold head container vacuum cavity (9) is composed of cold head container assembly (3), and the cold head container assembly (3) is welded and fixed with the Dewar (5) through the Dewar diameter pipe (4), forming a 300K temperature gradient; The first level cold seat (303) of the cold head container assembly (3) is bolted with the 50K cold screen (7) in the magnet Dewar vacuum cavity (10) through the first level thermal connection (6), forming a 50K temperature gradient; The bottom of the cold head container assembly (3) is the second level cold seat (306), which is bolted with the cold mass magnet (8), forming a 4K temperature gradient; The refrigerator assembly (1) is installed in the inner cavity of the cold head container assembly (3) and is detachably fixed through the connecting seat assembly (2); the refrigerator assembly (1) includes a first level cold head (101) and a second level cold head (103), the cold head container assembly (3) includes a first level cold seat (303) and a second level cold seat (306), the first level cold head (101) of the refrigerator assembly (1) is in conical contact with the first level cold seat (303) through the first level heat transfer block (102), and the second level cold head (103) of the refrigerator assembly (1) is in conical contact with the second level cold seat (306) through the second level heat transfer block assembly (104).

2. A flexible connection pluggable cold head vessel structure according to claim 1, wherein, The connecting seat assembly (2) includes a refrigerator connecting seat (204), the refrigerator assembly (1) is elastically connected with the cold head container seat (301) of the cold head container assembly (3) through connecting bolts (201) and compression springs (202), and is provided with an O-ring (203) for sealing.

3. The flexible connection pluggable cold head vessel structure of claim 1, wherein, In the cold head container assembly (3), the first level cold seat (303) is brazed with the cold head container seat (301) through the first level thin-walled pipe (302).

4. The flexible connection pluggable cold head vessel structure of claim 1, wherein, In the cold head container assembly (3), the second level cold seat (306) is connected with the first level cold seat (303) through the second level thin-walled pipe (304) and the flexible bellows (305) connected in sequence, the second level thin-walled pipe (304) and the flexible bellows (305) are sealingly welded, and the connecting ends of the two and the corresponding cold seat are sealingly brazed.

5. The flexible connection pluggable cold head vessel structure of claim 1, wherein, The second level heat transfer block assembly (104) includes a second level cold head connecting block (1041), the bottom of which is fixed with a plurality of connecting guide shafts (1043), the bottom of the plurality of connecting guide shafts (1043) is commonly connected with a second level conical heat transfer block (1044), and the outer periphery of each connecting guide shaft (1043) is sleeved with a second level flexible spring (1048) abutting against the second level cold head connecting block (1041) and the second level conical heat transfer block (1044) at both ends.

6. A flexible connection pluggable cold head vessel structure according to claim 5, wherein, The second level conical heat transfer block (1044) and the second level cold head connecting block (1041) are further provided with a flexible thermal connection (1042), and a second level cold head radiation shield (1045) is further provided outside the second level heat transfer block assembly (104).

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