A segmented thermal conductivity switch device for low temperature system

Abstract

The present invention discloses a segmented thermal conductivity switch device for use in a cryogenic system, comprising: a plurality of switch assemblies, which are used to connect to a plurality of cold plates and are sequentially spaced along the height direction of the cryogenic system, each of the switch assemblies comprises a conduction rod, one of the conduction rods is used to connect to a cold source, each of the conduction rods has an engagement position and a disconnection position, when the conduction rods are in the engagement position, each of the conduction rods is thermally connected, when the conduction rods are in the disconnection position, each of the conduction rods is disconnected. The segmented thermal conductivity switch device for use in a cryogenic system of the present invention can reduce heat leakage and improve cooling efficiency.

Description

Technical Field

[0001] The invention relates to the field of cryogenic and ultra-cryogenic technology, and in particular to a segmented thermal conductivity switch device used in a cryogenic system. Background Art

[0002] In the related technology, low temperature and ultra-low temperature environments are usually used in scientific research and some high-tech fields. Among them, the low temperature and ultra-low temperature environments required for scientific research or high-tech are achieved by lowering the room temperature. So far, people have come up with a way to use thermal conductivity switch devices for pre-cooling. Among them, traditional thermal conductivity switch devices often encounter heat leakage problems, etc., resulting in low cooling efficiency, and thus the desired low temperature environment cannot be achieved. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a segmented thermal conductivity switch device for use in a cryogenic system, which can reduce heat leakage and improve cooling efficiency.

[0004] According to some embodiments of the present invention, a segmented thermal conductivity switch device for use in a cryogenic system comprises: a plurality of switch assemblies, which are used to connect to a plurality of cold plates and are arranged in sequence along the height direction of the cryogenic system; each of the switch assemblies comprises a conduction rod, wherein one of the conduction rods is used to connect to a cold source, and each of the conduction rods has an engaged position and a disconnected position; when the conduction rods are in the engaged position, each of the conduction rods is thermally connected; and when the conduction rods are in the disconnected position, each of the conduction rods is disconnected.

[0005] According to some embodiments of the present invention, a segmented thermal conductivity switch device for use in a cryogenic system has at least the following beneficial effects: a cold source is connected to a conduction rod, so that the conduction rod transfers heat to the cold source, wherein when a plurality of conduction rods are each in a joined position, the conduction rods conduct heat to each other, thereby the cold plate conducts heat to the respective corresponding conduction rods, thereby each cold plate reaches its respective set low temperature, and when the plurality of conduction rods are each in a disconnected position, the cold plates do not affect each other, such a segmented thermal conductivity switch device for use in a cryogenic system can reduce heat leakage and improve cooling efficiency.

[0006] According to some embodiments of the present invention, a segmented thermal conductivity switch device is used in a low-temperature system, and each of the conduction rods can be driven to move axially toward the same end. When one of the conduction rods is driven to move axially, it can engage and drive the adjacent conduction rod to move axially, so that each of the conduction rods is in the engaged position.

[0007] According to some embodiments of the present invention, a segmented thermal conductivity switch device for use in a cryogenic system further includes a second flexible connector, one end of which is connected to the cold plate, and the other end of which is connected to the conductive rod.

[0008] In a segmented thermal conductivity switch device for use in a cryogenic system according to some embodiments of the present invention, the second flexible connector includes an oxygen-free copper braid.

[0009] According to some embodiments of the present invention, a segmented thermal conductivity switch device is used in a low-temperature system, the low-temperature system also includes a terminal plate, the cold plate located at the bottom of a plurality of the cold plates along the height direction of the low-temperature system is the terminal plate, and when each of the conduction rods is in the engagement position, the conduction rod located at the bottom abuts against the terminal plate.

[0010] According to some embodiments of the present invention, a segmented thermal conductivity switch device is used in a low-temperature system, the low-temperature system also includes a flange, the flange is arranged corresponding to one of the switch components, the flange is arranged above the cold plate located at the topmost layer among the multiple cold plates along the height direction of the low-temperature system, the flange includes a connecting part, one end of the connecting part is connected to the cold source, and the conduction rod is connected to the other end of the connecting part.

[0011] According to some embodiments of the present invention, a segmented thermal conductivity switch device for use in a cryogenic system further includes a first flexible connector, one end of which is connected to the connecting portion, and the other end of which is connected to the conductive rod.

[0012] According to some embodiments of the present invention, a segmented thermal conductivity switch device is used in a low-temperature system, the low-temperature system also includes an operating rod, the operating rod is arranged above the flange along the height direction of the low-temperature system, the operating rod can be switched between a working position and a release position, when the operating rod is in the working position, the conduction rod located at the uppermost end abuts against the operating rod, and the operating rod drives the conduction rod at the uppermost end to move axially so that each conduction rod is in the engagement position.

[0013] According to some embodiments of the present invention, a segmented thermal conductivity switch device is used in a low-temperature system, the switch assembly also includes a shell and an elastic element, the shell has a mounting cavity, the conduction rods are sequentially inserted into the elastic element and the mounting cavity, the elastic element can drive the conduction rods to move axially toward the same end, and when one of the conduction rods is driven to move axially, it can engage and drive the adjacent conduction rods to move axially so that each of the conduction rods is in the disconnected position.

[0014] According to some embodiments of the present invention, a segmented thermal conductivity switch device is used in a low-temperature system, the switch assembly also includes a retaining ring and two guide rings, the two guide rings are respectively connected to the upper end and the lower end of the elastic element, the conduction rod includes an abutment portion, and the retaining ring is arranged at the lower end of the abutment portion.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 It is a schematic diagram of a segmented thermal conductivity switch device used in a cryogenic system according to some embodiments of the present invention being arranged in a cryogenic system;

[0018] Figure 2 Schematic diagram of a cold source, a cold plate, a manipulator, a first flexible connector, a second flexible connector, a terminal plate, a flange, and a switch assembly in a segmented thermal conductivity switch device for use in a cryogenic system according to some embodiments of the present invention;

[0019] Figure 3 Schematic diagram of a cold plate, a first flexible connector, a second flexible connector, a terminal plate, a flange and a switch assembly in a segmented thermal conductivity switch device for use in a cryogenic system according to some embodiments of the present invention;

[0020] Figure 4 A schematic diagram of connecting a switch assembly to a second flexible connector in a segmented thermal conductivity switch device used in a cryogenic system according to some embodiments of the present invention;

[0021] Figure 5 A cross-sectional view of a switch assembly connected to a second flexible connector in a segmented thermal conductivity switch device for a cryogenic system according to some embodiments of the present invention;

[0022] Figure 6 A top view of a switch assembly connected to a second flexible connector in a segmented thermal conductivity switch device for use in a cryogenic system according to some embodiments of the present invention.

[0023] Reference numerals:

[0024] Cryogenic system 10;

[0025] A first cold plate 100, a second cold plate 110, and a third cold plate 120;

[0026] A first conducting rod 210, a second conducting rod 211, a third conducting rod 212, a fourth conducting rod 213, a housing 220, an elastic element 230, a retaining ring 240, a guide ring 250, and an abutting portion 260;

[0027] Cold source 300, cold source guide rod 310;

[0028] A first flexible connector 400, a second flexible connector 500, an oxygen-free copper braid 510, and a heat sink connector 511;

[0029] Terminal board 600;

[0030] Flange 700, connecting portion 710, vacuum chamber 720;

[0031] Operating lever 800;

[0032] Manipulator 900. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0038] Please refer to Figure 1 In some embodiments, a segmented thermal conductivity switch device (hereinafter referred to as the segmented thermal conductivity switch) for use in a cryogenic system 10 includes: a plurality of switch assemblies, which are used to connect to a plurality of cold plates and are arranged in sequence along the height direction of the cryogenic system 10. Each switch assembly includes a conduction rod, which is used to connect to a cold source 300. Each conduction rod has an engaged position and a disconnected position. When the conduction rod is in the engaged position, each conduction rod is thermally connected. When the conduction rod is in the disconnected position, each conduction rod is disconnected.

[0039] The cold source 300 is connected to the conduction rod, and the heat of the conduction rod and the object connected to the conduction rod will be transferred to the cold source 300 (the temperature of the conduction rod is greater than that of the cold source 300), and the temperature of the conduction rod and the object connected to the conduction rod will decrease. Among them, when the multiple conduction rods are in the joint position, all the conduction rods are in contact with each other, and the conduction rods conduct heat to each other. As a result, the heat of the cold plate connected to the conduction rod will be transferred to the conduction rod, and then transferred to the cold source 300; after a certain period of time, the temperature of the cold plate gradually decreases, and the temperature of each cold plate eventually drops to a level closer to the temperature of the cold source 300. Among them, after the conduction rod is in the disconnected position, each cold plate is independent of each other, without mutual involvement and interference. At the same time, each conduction rod is also independent of each other, and each maintains the temperature of the cold plate where it is located, unlike the traditional one with a higher temperature conduction rod, which extends from top to bottom to the ultra-low temperature area below (which will cause greater heat leakage). In this way, the segmented thermal conductivity switch can reduce heat leakage and improve the cooling efficiency.

[0040] Please continue to refer to Figure 2 In some embodiments, each conductive rod can be driven to move axially toward the same end. When one conductive rod is driven to move axially, it can engage and drive the adjacent conductive rod to move axially, so that each conductive rod is in an engaged position. Figure 2 In the up and down directions, each conduction rod can be driven to move downward.

[0041] For details, please refer to Figure 3, taking the low temperature system 10 including four conduction rods as an example, wherein the four conduction rods are respectively marked as the first conduction rod 210, the second conduction rod 211, the third conduction rod 212, and the fourth conduction rod 213. When the first conduction rod 210 is driven to move downward, the bottom end of the first conduction rod 210 abuts against the top end of the second conduction rod 211, and then the first conduction rod 210 and the second conduction rod 211 move downward together. As the second conduction rod 211 moves downward, when the bottom end of the second conduction rod 211 abuts against the top end of the third conduction rod 212, the first conduction rod 210, the second conduction rod 211, and the third conduction rod 212 move downward together. Similarly, as the third conduction rod 212 moves downward, when the bottom end of the third conduction rod 212 abuts against the top end of the fourth conduction rod 213, the first conduction rod 210, the second conduction rod 211, the third conduction rod 212, and the fourth conduction rod 213 move downward together until the bottom end of the fourth conduction rod 213 abuts against the terminal plate 600. Finally, when the multiple conduction rods are in the joint position, the combination of the multiple conduction rods is similar to a continuous rod. Since the first conduction rod 210 is connected to the cold source 300, the heat of any conduction rod and any cold plate can be transferred to the cold source.

[0042] Specifically, in order to reduce the impact of external factors such as vibration on the segmented thermal conductivity switch and improve the cooling efficiency of the segmented thermal conductivity switch, please refer to Figure 2 In some embodiments, the segmented thermal conductivity switch further includes a second flexible connector 500, one end of the second flexible connector 500 is connected to the cold plate, and the other end is connected to the conductive rod. For example, the flexible connector has good adaptability and can reduce the interference of factors such as vibration on the segmented thermal conductivity switch.

[0043] For further information, please refer to Figure 3 In some embodiments, the second flexible connector 500 includes an oxygen-free copper braid 510. Oxygen-free copper has the characteristic of high thermal conductivity. The oxygen-free copper braid 510 made of oxygen-free copper can increase the rate at which the cold plate conducts heat to the cold source 300, thereby increasing the cooling rate of the cold plate. Furthermore, the oxygen-free copper braid 510 is provided with a heat sink connector 511, and the heat sink connector 511 is connected to the conduction rod by bolts or the like.

[0044] Although the above description uses the example that the second flexible connector 500 includes the oxygen-free copper braid 510, it is not limited to this. Similarly, the first flexible connector 400 also includes the oxygen-free copper braid 510. As long as the second flexible connector 500 and the first flexible connector 400 include components supported by materials with good thermal conductivity such as metal, they will not be described one by one here.

[0045] For further information, please refer to Figure 1In some embodiments, the cryogenic system 10 further includes a terminal plate 600. The cold plate located at the bottom of the plurality of cold plates along the height direction of the cryogenic system 10 is the terminal plate 600. When each conductive rod in the segmented thermal conductivity switch device is in the engagement position, the conductive rod located at the bottom abuts against the terminal plate 600. For example, when a conductive rod is driven to move axially, it can engage with the conductive rod adjacent thereto and drive the conductive rod adjacent thereto to move axially, so that each conductive rod moves axially, wherein the conductive rod located at the bottom abuts against the terminal plate 600.

[0046] For further information, please refer to Figure 3 In some embodiments, the cryogenic system 10 further includes a flange 700, which is arranged corresponding to a switch assembly, and is arranged above the uppermost cold plate among the plurality of cold plates along the height direction of the cryogenic system 10, and the flange 700 includes a connecting portion 710, one end of the connecting portion 710 is connected to the cold source 300, and a conductive rod is connected to the other end of the connecting portion 710. For example, the flange 700 may be made of a flange, and the flange 700 encloses a vacuum cavity 720 in the cryogenic system 10, specifically, the cold source 300 is connected to the connecting portion 710 of the flange 700, and at the same time, the connecting portion 710 is connected to the conductive rod, for example, the connecting portion 710 may be a connecting rod, specifically, because the connecting portion 710 of the flange 700 is connected to the cold source 300, the cold source 300 may be liquid helium, and the cold source 300 absorbs heat.

[0047] Furthermore, in order to avoid unnecessary interference from external factors, please refer to Figure 2 In some embodiments, the segmented thermal conductivity switch further includes a first flexible connector 400, one end of the first flexible connector 400 is connected to the connecting portion 710, and the other end is connected to the conduction rod. For example, one end of the first flexible connector 400 is connected to the connecting portion 710, and the other end is connected to the conduction rod, whereby the cold source 300 absorbs the heat of the connecting portion 710, and the connecting portion 710 absorbs the heat of the conduction rod through the first flexible connector 400. When the multiple conduction rods are each in the engaged position, the conduction rods conduct heat to each other, whereby each cold plate transfers heat to the corresponding conduction rod. When the multiple conduction rods are each in the disconnected position, the cold plates do not affect each other, so the segmented thermal conductivity switch can reduce heat leakage and improve the cooling efficiency.

[0048] Specifically, in order to facilitate the staff to operate the segmented thermal conductivity switch device, improve the staff's work efficiency, and better use the segmented thermal conductivity switch, please refer to Figure 2In some embodiments, the cryogenic system 10 further includes an operating rod 800. The operating rod 800 is disposed above the flange 700 along the height direction of the cryogenic system 10. The operating rod 800 can be switched between a working position and a release position. When the operating rod 800 is in the working position, the conduction rod at the uppermost end abuts against the operating rod 800, and the operating rod 800 drives the conduction rod at the uppermost end to move axially, so that each conduction rod is in an engagement position. When the operating rod 800 is in the release position, the operating rod 800 is spaced apart from the top end of the first conduction rod 210. For example, a staff member can manipulate the operating rod 800 to switch the operating rod 800 between the working position and the release position. When the operating rod 800 is in the working position, the operating rod 800 abuts against the conduction rod at the upper end to drive the conduction rod at the upper end to move axially, so that each conduction rod is in an engagement position.

[0049] Furthermore, in order to facilitate the operation of the operating rod 800 and improve the accuracy of the movement of the operating rod 800 in the axial direction, specifically, a manipulator 900 is connected to the upper end of the operating rod 800, and the manipulator 900 is used to drive the operating rod 800 to rise and fall.

[0050] For further information, please refer to Figure 4 , Figure 5 and Figure 6 In some embodiments, the switch assembly further includes a housing 220 and an elastic element 230. The housing 220 has a mounting cavity, the conductive rod passes through the mounting cavity, and the conductive rod passes through the elastic element 230. The elastic element 230 can drive the conductive rod to move and reset. Figure 5 The conducting rod of the switch assembly in is in the disconnected position.

[0051] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 5 The first conducting rod 210 is taken as an example. In some embodiments, the switch assembly further includes a retaining ring 240 and two guide rings 250, the two guide rings 250 are respectively connected to the upper end and the lower end of the elastic element 230, the conducting rod includes an abutment portion 260, and the retaining ring 240 is arranged at the lower end of the abutment portion 260. For example, the elastic element 230 can be a spring, and the guide ring 250 is connected to the upper end and the lower end of the spring, thereby being arranged together in the installation cavity. The abutment portion 260 of the conducting rod abuts against the top of the retaining ring 240, and the abutment portion 260 can be a portion with a larger diameter in the conducting rod. In this way, when the conducting rod is driven to move downward (that is, the process of the switch assembly and the conducting rod switching from the disconnected position to the engaged position), the retaining ring 240 squeezes the spring, and the compression degree of the elastic element 230 increases; when the external force driving the conducting rod to move downward is eliminated, under the elastic force of the elastic element 230, the conducting rod is reset and moves upward, and the conducting rod returns to the disconnected position.

[0052] The following is a detailed description of the working process of the segmented thermal conductivity switch. Please refer to Figure 1 , Figure 2 and Figure 3 , take the low temperature system 10 including four cold plates and four conduction rods as an example, wherein the four cold plates are respectively marked as the first cold plate 100, the second cold plate 110, the third cold plate 120, and the terminal plate 600, and the four conduction rods are respectively marked as the first conduction rod 210, the second conduction rod 211, the third conduction rod 212, and the fourth conduction rod 213. Such marking is only for the convenience of readers to understand the present application according to the drawings, and is not a specific limitation. At the same time, since the positions of the four conduction rods are different, their lengths are different. It can be imagined that the functions and uses of the four cold plates do not have to be the same.

[0053] Specifically, liquid helium is used to provide the cold source 300, and the temperature of the liquid helium is 4K. After that, the operating rod 800 abuts against the first conduction rod 210 located at the uppermost position, thereby driving the first conduction rod 210 to move axially, and the upper first conduction rod 210 is connected to the cold source guide rod 310 through the first flexible connector 400, and the cold source guide rod 310 is connected to the cold source 300. Further, the flange 700 and the shell of the cryogenic system 10 form a closed vacuum chamber 720, and the cold source guide rod 310 is in the liquid helium. Thus, the first conduction rod 210 conducts heat to the cold source 300, and then the second conduction rod 211 conducts heat to the first conduction rod 210, the first cold plate 100 conducts heat to the second conduction rod 211, the third conduction rod 212 conducts heat to the second conduction rod 211, the second cold plate 110 conducts heat to the third conduction rod 212, the fourth conduction rod 213 conducts heat to the third conduction rod 212, the third cold plate 120 conducts heat to the fourth conduction rod 213, and the fourth conduction rod 213 at the bottom is abutted against the terminal plate 600.

[0054] Among them, after each conduction rod is in the engagement position, the temperature of multiple cold plates is roughly around 4K. After that, the staff can use other means to lower the temperature of each cold plate to a lower level.

[0055] Furthermore, in the low temperature system 10 with limited space, the contact area of ​​each conduction rod can be appropriately increased to improve the rate of heat conduction. A thermometer can be provided on each cold plate for temperature monitoring, so that the target temperature to be achieved is displayed on the thermometer on each cold plate. Furthermore, each conduction rod is in a disconnected position to ensure that each cold plate can independently maintain its own temperature range without being disturbed by changes in other cold plates. Therefore, when the mobile manipulator 900 moves upward, the elastic element 230 in each switch assembly will drive the conduction rod to be in a disconnected position, thereby stopping the conduction of heat between the conduction rods, so that the temperature of each cold plate is different, and the temperature of each cold plate will not affect each other.

[0056] Among them, the upper and lower positions, as well as the upper and lower ends mentioned in this article are based on the description when the cold plate is placed horizontally. The cold plate is placed horizontally to form a horizontal bearing surface. The cold plate can provide an operating environment to facilitate the work, such as placing samples or sensors on the cold plate. Therefore, the upper and lower positions are determined based on the actual use environment of the low-temperature system 10 and the cold plate, and cannot be used as a limitation here.

[0057] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A segmented thermal conductivity switch device for use in a cryogenic system, characterized in that: include: A plurality of switch assemblies, used to connect with a plurality of cold plates, and arranged in sequence along the height direction of the cryogenic system. Each of the switch assemblies comprises a conduction rod, one of which is used to connect with a cold source, and each of the conduction rods has an engaged position and a disconnected position. When the conduction rod is in the engaged position, each of the conduction rods is thermally connected, and when the conduction rod is in the disconnected position, each of the conduction rods is disconnected. Each of the conductive rods can be driven to move axially toward the same end. When one of the conductive rods is driven to move axially, it can engage with and drive the adjacent conductive rod to move axially, so that each of the conductive rods is in the engaged position. It also includes a second flexible connector, one end of which is connected to the cold plate, and the other end of which is connected to the conductive rod; The cryogenic system further comprises a terminal plate, wherein the cold plate located at the bottom of the plurality of cold plates along the height direction of the cryogenic system is the terminal plate, and when each of the conduction rods is in the engagement position, the conduction rod located at the bottom abuts against the terminal plate; The cryogenic system further comprises a flange, the flange is arranged corresponding to one of the switch assemblies, the flange is arranged above the uppermost cold plate among the plurality of cold plates along the height direction of the cryogenic system, the flange comprises a connecting portion, one end of the connecting portion is connected to the cold source, and the conducting rod is connected to the other end of the connecting portion; It also includes a first flexible connector, one end of which is connected to the connecting portion, and the other end of which is connected to the conductive rod; The cryogenic system also includes an operating rod, which is arranged above the flange along the height direction of the cryogenic system. The operating rod can be switched between a working position and a release position. When the operating rod is in the working position, the conduction rod at the uppermost end abuts against the operating rod, and the operating rod drives the conduction rod at the uppermost end to move axially so that each conduction rod is in the engagement position.

2. A segmented thermal conductivity switch device for use in a cryogenic system according to claim 1, characterized in that: The second flexible connector includes an oxygen-free copper braid.

3. A segmented thermal conductivity switch device for use in a cryogenic system according to any one of claims 1 to 2, characterized in that: The switch assembly also includes a shell and an elastic element, the shell has an installation cavity, the conduction rod is sequentially inserted into the elastic element and the installation cavity, the elastic element can drive the conduction rod to move axially toward the same end, when one of the conduction rods is driven to move axially, it can engage and drive the adjacent conduction rod to move axially so that each of the conduction rods is in the disconnected position.

4. A segmented thermal conductivity switch device for use in a cryogenic system according to claim 3, characterized in that: The switch assembly further comprises a retaining ring and two guide rings, wherein the two guide rings are respectively connected to the upper end and the lower end of the elastic element, the conductive rod comprises an abutting portion, and the retaining ring is arranged at the lower end of the abutting portion.

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