Cold shield self-pressing cooling device

Abstract

The invention relates to the technical field of low-temperature cooling, and provides a cold shield self-pressing cooling device which comprises a vacuum cavity and a refrigerating machine arranged on the vacuum cavity. The first cold shield flange, the first-stage cold shield and the second cold shield flange form a first-stage cold shield cavity, and the first-stage cold shield cavity is embedded in the vacuum cavity; the first cold shield flange is connected with the bottom end of the first-stage cold shield; the spring assembly is arranged between the second cold shield flange and the top end of the vacuum cavity; and the to-be-cooled test cavity is located in the first-stage cold shield cavity. According to the cold screen self-pressing cooling device, the spring assembly is used for covering the second cold screen flange to the top end of the first-stage cold screen, and the spring assembly can be stretched or compressed when subjected to axial force; by arranging the spring assembly, when the vacuum chamber is closed, the second cold shield flange and the first-stage cold shield can be automatically pressed, so that the assembly difficulty of the first-stage cold shield chamber is greatly reduced, and a certain space can be reserved for the height design of the first-stage cold shield.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature cooling, and in particular to a cold screen self-compression cooling device. Background Art

[0002] Cryogenic environments are crucial for large-scale scientific projects. These include the Large Hadron Collider, nuclear fusion devices, and superconducting magnets, all requiring extremely low temperatures to cool critical internal components and achieve the desired results. Most low-temperature experiments are conducted in cryostats, key equipment in scientific research and industry used for precision measurement and storage of specialized materials. In certain high-precision applications, such as superconducting magnet systems, the stability of the internal cryogenic environment is crucial. To maintain constant low temperatures, the amount of heat transferred from the external environment via radiation must be significantly reduced.

[0003] Installing a cold shield and its flange is an important means of effectively suppressing radiant heat transfer. Existing cold shield systems typically use aluminum or copper plates as the main material, thermally connected to the GM chiller's primary cold head via a copper braid. The cold temperature of the chiller's cold head is efficiently transferred to the cold shield via the copper braid, maintaining a low temperature and significantly reducing radiant heat load.

[0004] In the prior art, the connection between the cold screen flange and the cold screen is mostly through threaded fasteners. However, this method places certain requirements on the processing accuracy of the threads and the through holes on the cold screen, and the connection through threaded fasteners is not convenient for the assembly of the cold screen chamber. Summary of the Invention

[0005] The present invention provides a cold screen self-compression cooling device, which is used to solve the defect in the prior art that the cold screen and the cold screen flange are connected by threaded fasteners, which is inconvenient for assembling the cold screen chamber, and enables the spring assembly to be stretched or compressed when subjected to axial force.

[0006] The present invention provides a cold screen self-compression and temperature reduction device, comprising: Vacuum chamber, A refrigerator is provided on the vacuum chamber, and the refrigerator provides cooling for the interior of the vacuum chamber; A first-level cold shield chamber is formed by a first cold shield flange, a first-level cold shield, and a second cold shield flange, wherein the first-level cold shield chamber is nested inside the vacuum chamber; the first cold shield flange is connected to the bottom end of the first-level cold shield; a spring assembly, disposed between the second cold shield flange and the top of the vacuum chamber, the spring assembly being used to cover the second cold shield flange to the top of the primary cold shield; The test cavity to be cooled is located inside the first-level cold shield chamber.

[0007] A cold screen self - pressing cooling device provided by the present invention, the vacuum cavity includes: The first vacuum flange, on which the refrigerator is provided; The vacuum cover, which is hermetically connected to the first vacuum flange; The second vacuum flange, which is hermetically connected to the top of the vacuum cover; the first vacuum flange, the vacuum cover and the second vacuum flange enclose the vacuum cavity.

[0008] A cold screen self - pressing cooling device provided by the present invention, the spring assembly includes: The spring bottom plate, which is connected to the second vacuum flange through threaded fasteners; The spring top plate, on which a threaded post is provided, and the threaded post is connected to the second cold screen flange; The spring member, with both ends respectively connected to the spring bottom plate and the spring top plate.

[0009] A cold screen self - pressing cooling device provided by the present invention, the spring bottom plate and the spring top plate are coaxially arranged.

[0010] A cold screen self - pressing cooling device provided by the present invention, both ends of the spring member are connected with boss blocks, and the boss blocks are respectively connected to the spring bottom plate and the spring top plate.

[0011] A cold screen self - pressing cooling device provided by the present invention, the refrigerator includes: The refrigerator body, which is arranged on the first vacuum flange, and the refrigerator body penetrates through the first vacuum flange and the first cold screen flange; The first - stage cold head and the second - stage cold head, which are arranged on the refrigerator body at intervals, the first - stage cold head is connected to the first cold screen flange, the first - stage cold head is used to provide cooling capacity for the first - stage cold screen chamber, the second - stage cold head is thermally connected to the test chamber to be cooled, and the second - stage cold head is used to provide cooling capacity for the test chamber to be cooled.

[0012] A cold screen self - pressing cooling device provided by the present invention, further includes: The connecting rod, which connects the second vacuum flange and the second cold screen flange.

[0013] A cold screen self - pressing cooling device provided by the present invention, the connecting rod is threadedly connected to the second vacuum flange, and the connecting rod is threadedly connected to the second cold screen flange.

[0014] A cold screen self - pressing cooling device provided by the present invention, the first - stage cold screen, the first cold screen flange and the second cold screen flange are all made of oxygen - free copper.

[0015] A cold screen self - pressing cooling device provided by the present invention, wherein the spring top plate and the spring bottom plate are made of polytetrafluoroethylene or epoxy resin.

[0016] Through this structural arrangement, the following cooling process can be achieved: The refrigerating machine provides a cold source for the test cavity to be cooled; Based on the first cold screen flange being covered to the lower end of the first - stage cold screen through connecting bolts and the second cold screen flange being covered to the upper end of the first - stage cold screen through the spring assembly, the first - stage cold head of the refrigerating machine is connected to the first cold screen flange, providing cold energy for the first - stage cold screen cavity including the first cold screen flange, the first - stage cold screen, and the second cold screen flange; The second - stage cold head of the refrigerating machine is thermally connected to the test cavity to be cooled, providing cold energy for the test cavity to be cooled.

[0017] In the cold screen self - pressing cooling device provided by the present invention, the spring assembly is arranged between the second cold screen flange and the top of the vacuum cavity. The spring assembly is used to cover the second cold screen flange to the top of the first - stage cold screen, and the spring assembly can be stretched or compressed when subjected to an axial force; By setting the spring assembly, when the vacuum chamber is sealed, the second cold screen flange and the first - stage cold screen can be automatically pressed tightly, greatly reducing the assembly difficulty of the first - stage cold screen cavity and also leaving some room for the height design of the first - stage cold screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the cold screen self - pressing cooling device provided by the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the spring assembly in the cold screen self - pressing cooling device provided by the present invention.

[0021] Reference Numerals: 1. Vacuum cavity; 11. First vacuum flange; 12. Vacuum cover; 13. Second vacuum flange; 2. Refrigerating machine; 21. Refrigerating machine body; 22. First - stage cold head; 23. Second - stage cold head; 3. First cold screen flange; 4. First - stage cold screen; 5. Second cold screen flange; 6. First - stage cold screen cavity; 7. Spring assembly; 71. Spring bottom plate; 72. Spring top plate; 73. Spring element; 74. Boss block; 8. Test cavity to be cooled; 9. Connecting rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0023] The following combines Figure 1 - Figure 2 to describe the cold screen self-pressing cooling device of the present invention.

[0024] As Figure 1 and Figure 2 shown, the structural schematic diagram of the cold screen self-pressing cooling device provided by the embodiment of the present invention includes a vacuum chamber 1, a refrigerator 2, a first cold screen flange 3, a primary cold screen 4 and a second cold screen flange 5.

[0025] The interior of the vacuum chamber 1 forms a vacuum cavity, and the vacuum cavity is airtight. The refrigerator 2 is arranged on the vacuum chamber 1, and the refrigerator 2 provides cooling capacity for the interior of the vacuum chamber 1. The primary cold screen cavity 6 formed by the first cold screen flange 3, the primary cold screen 4 and the second cold screen flange 5 is nested inside the vacuum chamber 1; the first cold screen flange 3 is connected to the bottom end of the primary cold screen 4, and the first cold screen flange 3 can be covered to the bottom end of the primary cold screen 4 through connecting bolts, and the second cold screen flange 5 is covered to the top end of the primary cold screen 4 through a spring assembly 7. That is, the spring assembly 7 is arranged between the second cold screen flange 5 and the top end of the vacuum chamber 1, and the spring assembly 7 is used to cover the second cold screen flange 5 to the top end of the primary cold screen 4. The test cavity 8 to be cooled is located inside the primary cold screen cavity 6.

[0026] In the cold screen self-pressing cooling device provided by the present invention, the refrigerator 2 provides a cold source for the test cavity 8 to be cooled. The first cold screen flange 3 is connected to the bottom end of the primary cold screen 4, and the second cold screen flange 5 is covered to the top end of the primary cold screen 4 through the spring assembly 7. The refrigerator 2 is thermally connected to the test cavity 8 to be cooled to provide cooling capacity for the test cavity 8 to be cooled.

[0027] By arranging the spring assembly 7 between the top wall of the vacuum cavity and the top wall of the primary cold screen cavity 6, the spring assembly 7 can be stretched or compressed when subjected to an axial force. When the vacuum chamber 1 is airtight, the second cold screen flange 5 and the primary cold screen 4 can be automatically pressed together, and the second cold screen flange 5 and the primary cold screen 4 in the primary cold screen cavity 6 are tightly covered. The assembly difficulty of the primary cold screen cavity 6 is greatly reduced, and a certain margin can also be left for the height design of the primary cold screen 4. At the same time, the refrigerator 2 is connected to the first cold screen flange 3 to realize the heat conduction of the cooling capacity of the refrigerator 2 to the first cold screen flange 3, the primary cold screen 4 and the second cold screen flange 5.

[0028] In a feasible embodiment of the present invention, the vacuum chamber 1 includes a first vacuum flange 11, a vacuum cover 12, and a second vacuum flange 13. A refrigerator 2 is provided on the first vacuum flange 11; the vacuum cover 12 is hermetically connected to the first vacuum flange 11; the second vacuum flange 13 is hermetically connected to the top of the vacuum cover 12; the first vacuum flange 11, the vacuum cover 12, and the second vacuum flange 13 enclose the vacuum chamber 1. The vacuum chamber 1 is airtight, and the vacuum cover 12 is connected to the first vacuum flange 11 and the second vacuum flange 13 by connecting bolts, and sealing rings are provided between them.

[0029] It should be noted here that the present invention does not make any limitations on the specific structures of the vacuum cover 12, the first vacuum flange 11, and the second vacuum flange 13. For example, the vacuum cover 12 can be composed of a cylinder and an outer extension flange, the cylinder and the outer extension flange are welded together, and the cylinder, the outer extension flange, the first vacuum flange 11, and the second vacuum flange 13 are made of stainless steel material.

[0030] In a feasible embodiment of the present invention, the spring assembly 7 includes a spring bottom plate 71, a spring top plate 72, and a spring member 73. The spring bottom plate 71 is connected to the second vacuum flange 13 by threaded fasteners; a threaded post is provided on the spring top plate 72, and the threaded post is connected to the second cold shield flange 5; both ends of the spring member 73 are respectively connected to the spring bottom plate 71 and the spring top plate 72, and the spring member 73 can be stretched or compressed when subjected to an axial force. The spring bottom plate 71 and the spring top plate 72 are coaxially arranged. Both ends of the spring member 73 are connected with boss blocks 74, and the boss blocks 74 are respectively connected to the spring bottom plate 71 and the spring top plate 72.

[0031] It should be noted here that in order to reduce the heat leakage of the cold quantity of the first stage cold head 22 of the refrigerator 2 along the spring assembly 7 and improve the thermal efficiency of the spring assembly 7, the materials of the spring top plate 72 and the spring bottom plate 71 can be polytetrafluoroethylene or epoxy resin.

[0032] In a feasible embodiment of the present invention, the refrigerator 2 includes a refrigerator body 21, and a first stage cold head 22 and a second stage cold head 23 arranged at intervals. The refrigerator body 21 is provided on the first vacuum flange 11, and the refrigerator body 21 penetrates through the first vacuum flange 11 and the first cold shield flange 3. The first stage cold head 22 and the second stage cold head 23 are arranged at intervals on the refrigerator body 21. Both the first stage cold head 22 and the second stage cold head 23 are located in the vacuum cavity of the vacuum cover 12. The first stage cold head 22 is connected to the first cold shield flange 3, and the first stage cold head 22 is used to provide cold quantity for the first stage cold shield chamber 6. The second stage cold head 23 is thermally connected to the test chamber 8 to be cooled, and the second stage cold head 23 is used to provide cold quantity for the test chamber 8 to be cooled. For example, the test chamber 8 to be cooled includes but is not limited to a gas test kettle.

[0033] As can be seen from the embodiments described above, the primary cold shield chamber 6 provided in the cold shield self-compressing cooling device can effectively reduce the heat leakage caused by heat conduction and radiation, thereby achieving a better cooling effect.

[0034] It should be noted here that, to ensure the reliability of heat transfer, the materials of the primary cold shield 4, the first cold shield flange 3, and the second cold shield flange 5 are oxygen-free copper, and the primary cold shield 4, the first cold shield flange 3, and the second cold shield flange 5 need to be pickled and passivated.

[0035] With this structural arrangement, the following cooling process can be achieved: The refrigerator 2 provides a cold source for the test cavity 8 to be cooled; based on the first cold shield flange 3 being covered to the lower end of the primary cold shield 4 through a connecting bolt and the second cold shield flange 5 being covered to the upper end of the primary cold shield 4 through a spring assembly 7, the first cold shield flange 3 is connected to the primary cold head 22 of the refrigerator 2, providing cold for the primary cold shield chamber 6 including the first cold shield flange 3, the primary cold shield 4, and the second cold shield flange 5; the test cavity 8 to be cooled is thermally connected to the secondary cold head 23 of the refrigerator 2, providing cold for the test cavity 8 to be cooled.

[0036] In a feasible embodiment of the present invention, it further includes a connecting rod 9, and the connecting rod 9 connects the second vacuum flange 13 and the second cold shield flange 5.

[0037] It should be noted here that the present invention does not make any specific limitations on the connection method of the connecting rod 9 to the second vacuum flange 13 and the connection method of the connecting rod 9 to the second cold shield flange 5. For example, the connecting rod 9 is threadedly connected to the second vacuum flange 13, and the connecting rod 9 is connected to the second cold shield flange 5 using a threaded nut.

[0038] In a feasible embodiment of the present invention, the spring top plate 72 and the spring bottom plate 71 are made of polytetrafluoroethylene or epoxy resin.

[0039] Therefore, for the cold shield self-compressing cooling device provided by the present invention, the first vacuum flange 11, the vacuum cover 12, and the second vacuum flange 13 form a vacuum cavity 1. The inner side of the vacuum cavity 1 is a vacuum chamber. The first cold shield flange 3, the primary cold shield 4, and the second cold shield flange 5 form a primary cold shield chamber 6. The first cold shield flange 3 is covered to the lower end of the primary cold shield 4 through a connecting bolt, and the second cold shield flange 5 is covered to the upper end of the primary cold shield 4 through a spring assembly 7. The vacuum chamber and the primary cold shield chamber 6 are nested layer by layer from the outside to the inside. The refrigerator 2 includes a refrigerator body 21 and a primary cold head 22 and a secondary cold head 23 spaced apart on the refrigerator body 21. The primary cold head 22 and the secondary cold head 23 are both located inside the vacuum chamber. The primary cold head 22 is connected to the first cold shield flange 3 for providing cold for the primary cold shield chamber 6, and the secondary cold head 23 is thermally connected to the test cavity 8 to be cooled for providing cold for the test cavity 8 to be cooled.

[0040] The working process of the cold shield self - pressing cooling device is described below in conjunction with specific embodiments. It should be understood that the following are only illustrative embodiments of the present invention and do not constitute any limitation to the present invention. Specifically, the above - mentioned working process may include the following steps: The refrigeration machine body 21 is installed on the first vacuum flange 11 of the vacuum chamber. The refrigeration machine body 21, the first - stage cold head 22, and the second - stage cold head 23 are connected in sequence. The first - stage cold head 22 of the refrigeration machine 2 is connected to the first cold shield flange 3, and the second - stage cold head 23 of the refrigeration machine 2 is thermally connected to the test cavity 8 to be cooled; The vacuum chamber and the first - stage cold shield chamber 6 are nested layer by layer from the outside to the inside. The first cold shield flange 3 is covered to the lower end of the first - stage cold shield 4 through connecting bolts. When the vacuum chamber is sealed, that is, when the vacuum cover 12 is connected to the first vacuum flange 11 and the second vacuum flange 13 through connecting bolts and sealing rings are provided on both, the second cold shield flange 5 and the first - stage cold shield 4 in the first - stage cold shield chamber are automatically pressed through the spring assembly 7; The vacuum chamber including the vacuum cover 12, the first vacuum flange 11, and the second vacuum flange 13 is evacuated by an external vacuum pump; The refrigeration machine 2 is turned on. The cold quantity of the first - stage cold head 22 of the refrigeration machine 2 is conducted to the first cold shield flange 3, the first - stage cold shield 4, and the second cold shield flange 5, greatly reducing the radiative heat leakage from the test cavity 8 to be cooled from the room - temperature end to the low - temperature end. The cold quantity of the second - stage cold head 23 of the refrigeration machine 2 is conducted to the test cavity 8 to be cooled, realizing the cooling of the test cavity 8 to be cooled.

[0041] According to the above - described cooling process, when the vacuum chamber is sealed, that is, when the vacuum cover 12 is connected to the first vacuum flange 11 and the second vacuum flange 13 through connecting bolts and sealing rings are provided on both, the second cold shield flange 5 and the first - stage cold shield 4 in the first - stage cold shield chamber are tightly covered through the spring assembly 7, realizing the conduction of the cold quantity of the first - stage cold head 22 of the refrigeration machine 2 to the first cold shield flange 3, the first - stage cold shield 4, and the second cold shield flange 5. Thus, by setting the spring assembly 7, when the vacuum chamber is sealed, the second cold shield flange 5 and the first - stage cold shield 4 can be automatically pressed, greatly reducing the assembly difficulty of the first - stage cold shield chamber 6 and also leaving some room for the height design of the first - stage cold shield 4.

[0042] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the embodiments of the present invention can be understood according to specific situations.

[0043] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "way", "specific way", or "some ways", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or way are included in at least one embodiment or way of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or way. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or ways. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or ways described in this specification and the features of different embodiments or ways.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some 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 invention.

Claims

1. A cold screen self-pressing cooling device, characterized in that, Comprising: Vacuum chamber (1); Refrigerator (2), disposed on the vacuum chamber (1), and the refrigerator (2) provides cooling capacity for the interior of the vacuum chamber (1); A primary cold shield chamber (6) composed of a first cold shield flange (3), a primary cold shield (4) and a second cold shield flange (5), the primary cold shield chamber (6) is nested inside the vacuum chamber (1); the first cold shield flange (3) is connected to the bottom end of the primary cold shield (4); Spring assembly (7), disposed between the top end of the second cold shield flange (5) and the vacuum chamber (1), the spring assembly (7) is used to cover the second cold shield flange (5) to the top end of the primary cold shield (4); Test chamber to be cooled (8), located inside the primary cold shield chamber (6).

2. The cold screen self-pressing cooling device according to claim 1, characterized in that, The vacuum chamber (1) includes: First vacuum flange (11), on which the refrigerator (2) is disposed; Vacuum hood (12), sealingly connected to the first vacuum flange (11); Second vacuum flange (13), sealingly connected to the top of the vacuum hood (12); the first vacuum flange (11), the vacuum hood (12) and the second vacuum flange (13) enclose the vacuum chamber (1).

3. The cold screen self-pressing cooling device according to claim 2, wherein, The spring assembly (7) includes: Spring bottom plate (71), connected to the second vacuum flange (13) by threaded fasteners; Spring top plate (72), on which a threaded post is provided, and the threaded post is connected to the second cold shield flange (5); Spring member (73), with two ends respectively connected to the spring bottom plate (71) and the spring top plate (72).

4. The cold screen self-pressing cooling device according to claim 3, characterized in that, The spring bottom plate (71) and the spring top plate (72) are coaxially arranged.

5. The cold screen self-pressing cooling device according to claim 3, wherein Both ends of the spring member (73) are connected with boss blocks (74), and the boss blocks (74) are respectively connected to the spring bottom plate (71) and the spring top plate (72).

6. The cold screen self-pressing cooling device according to claim 2, wherein The refrigerator (2) includes: Refrigerator body (21), disposed on the first vacuum flange (11), and the refrigerator body (21) penetrates through the first vacuum flange (11) and the first cold shield flange (3); Primary cold head (22) and secondary cold head (23), spaced apart on the refrigerator body (21), the primary cold head (22) is connected to the first cold shield flange (3), the primary cold head (22) is used to provide cooling capacity for the primary cold shield chamber (6), the secondary cold head (23) is thermally connected to the test chamber to be cooled (8), and the secondary cold head (23) is used to provide cooling capacity for the test chamber to be cooled (8).

7. The cold screen self-pressing cooling device according to claim 2, wherein, It further includes: Connecting rod (9), connecting the second vacuum flange (13) and the second cold shield flange (5).

8. The cold screen self-pressing cooling device according to claim 7, wherein The connecting rod (9) is threadedly connected to the second vacuum flange (13), and the connecting rod (9) is threadedly connected to the second cold shield flange (5).

9. The cold screen self-pressing cooling device according to claim 2, wherein The primary cold shield (4), the first cold shield flange (3) and the second cold shield flange (5) are all made of oxygen-free copper.

10. The cold screen self-pressing cooling device according to claim 3, characterized in that, The spring top plate (72) and the spring bottom plate (71) are made of polytetrafluoroethylene or epoxy resin.

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