Heat insulation supporting structure used in ultralow temperature environment and cryostat

Abstract

The utility model discloses a heat insulation supporting structure used in an ultralow temperature environment and a cryostat, heat insulation is realized mainly by arranging a low temperature heat insulation piece, a first main bearing piece, a medium temperature heat insulation piece, a second main bearing piece and a room temperature heat insulation piece which are stacked layer by layer, all the components are only stacked and connected layer by layer, the structure is simple, the processing is easy, and the cost is low. And the requirement for structure machining precision is low, and production and machining cost can be reduced. According to the main technical scheme, the heat insulation supporting structure comprises a low-temperature heat insulation part, a first main bearing part, a medium-temperature heat insulation part, a second main bearing part and a room-temperature heat insulation part. The first main bearing part is located between the low-temperature heat insulation part and the medium-temperature heat insulation part, and the second main bearing part is located between the medium-temperature heat insulation part and the room-temperature heat insulation part. The heat insulation support is mainly used for heat insulation support.

Description

Technical Field

[0001] The utility model relates to the technical field of low temperature thermostats, in particular to a heat insulation support structure and a low temperature thermostat used in an ultra-low temperature environment. Background Art

[0002] Devices that need to work in ultra-low temperature environments are referred to as cold mass components in this application and need to be placed in a vacuum cryostat to ensure normal operating performance. The cold mass component needs to be installed and fixed in the cryostat through a support structure, and the support structure must be tightly connected to the outer shell of the cryostat to maintain a certain degree of reliability and structural strength. However, since the cryostat is in a room temperature environment with a temperature of about 300K, the support structure connects the cold mass component and the 300K thermostat outer shell, which will cause heat transfer between the two, affecting the temperature and working performance of the cold mass component.

[0003] In order to ensure the reliability of the cold mass assembly and reduce heat leakage, high requirements are placed on the support structure. In the prior art, a low-temperature insulation support device is disclosed in the patent with publication number CN204026050U, including a glass fiber thin-walled cylinder, and the cylinder is provided with multiple groups of rings and discs from top to bottom, each group of rings and discs are interference fit with the glass fiber thin-walled cylinder, wherein the upper and lower groups of rings and discs are made of stainless steel, and each group of rings and discs in the middle is made of hard aluminum material, and the hard aluminum rings are used to fix the cold screen. Although such a device meets the requirements of low-temperature insulation support, it has a low assembly yield rate because of its high requirements on component processing accuracy, complex assembly process, and low assembly yield rate. Utility Model Content

[0004] In view of this, in order to solve at least one of the above technical problems, an embodiment of the utility model provides a thermal insulation support structure and a cryostat for use in an ultra-low temperature environment.

[0005] In order to achieve the above purpose, the utility model mainly provides the following technical solutions:

[0006] On the one hand, the utility model provides a heat-insulating support structure for use in an ultra-low temperature environment, comprising:

[0007] A low-temperature insulation component (1), a first main load-bearing component (2), a medium-temperature insulation component (3), a second main load-bearing component (4) and a room-temperature insulation component (5);

[0008] The first main load-bearing member (2) is located between the low-temperature insulation member (1) and the medium-temperature insulation member (3), and the second main load-bearing member (4) is located between the medium-temperature insulation member (3) and the room-temperature insulation member (5).

[0009] Wherein, the first main load-bearing component (2) and the second main load-bearing component (4) are both hollow barrel-shaped structures.

[0010] Among them, the low-temperature insulation component (1), the medium-temperature insulation component (3) and the room-temperature insulation component (5) are all annular components.

[0011] The low-temperature insulation component (1), the medium-temperature insulation component (3) and the room-temperature insulation component (5) are made of glass fiber.

[0012] The thermal insulation support structure also includes:

[0013] A plurality of bolts (6) and a plurality of nuts (7);

[0014] The first main load-bearing member (2) and the low-temperature heat-insulating member (1), as well as the first main load-bearing member (2) and the medium-temperature heat-insulating member (3), are connected respectively by at least one bolt (6) and at least one nut (7);

[0015] The second main load-bearing member (4) and the medium-temperature insulation member (3), as well as the second main load-bearing member (4) and the room-temperature insulation member (5) are connected respectively by at least one bolt (6) and at least one nut (7).

[0016] The first main load-bearing component (2) comprises a first load-bearing body (21), a first upper flange (22) and a first lower flange (23); the first load-bearing body (21) is a cylindrical structure; the first upper flange (22) and the first lower flange (23) are respectively arranged at the edges of the openings at both ends of the first load-bearing body (21) and extend toward the outside of the first load-bearing body (21); the low-temperature heat-insulating component (1) is connected to the first upper flange (22); and the medium-temperature heat-insulating component (3) is connected to the first lower flange (23);

[0017] The second main load-bearing component (4) comprises a second load-bearing body (41), a second upper flange (42) and a second lower flange (43); the second load-bearing body (41) is a tubular structure; the second upper flange (42) and the second lower flange (43) are respectively arranged at the opening edges at both ends of the second load-bearing body (41) and extend toward the outside of the second load-bearing body (41); the medium-temperature insulation component (3) is connected to the second upper flange (42); and the room-temperature insulation component (5) is connected to the second lower flange (43).

[0018] The thermal insulation support structure also includes:

[0019] A plurality of thermal insulation gaskets (8);

[0020] The heat insulating gasket (8) is sleeved on the bolt (6), the heat insulating gasket (8) is arranged between the first main load bearing member (2) and the nut (7), and the heat insulating gasket (8) is arranged between the second main load bearing member (4) and the nut (7).

[0021] The thermal insulation support structure also includes:

[0022] A cooling ring (9), the cooling ring (9) is connected to the second main load-bearing component (4), and the cooling ring (9) is used to connect a cooling component.

[0023] On the other hand, the utility model also provides a low temperature thermostat, comprising any of the aforementioned heat insulation support structures for use in ultra-low temperature environments and a thermostat body;

[0024] The thermostat body comprises a vacuum cylinder, the vacuum cylinder comprises an inner cavity, the heat insulating support structure is located in the inner cavity, and the room temperature heat insulating member (5) is connected to the vacuum cylinder.

[0025] The cryostat also includes a liquid nitrogen cold screen, which is used to cool the inner cavity;

[0026] The cooling ring (9) of the heat-insulating support structure is connected to the liquid nitrogen cold shield.

[0027] The utility model proposes an insulating support structure and a low-temperature thermostat for use in an ultra-low temperature environment, and thermal insulation is mainly achieved by arranging low-temperature insulating parts, a first main load-bearing part, a medium-temperature insulating part, a second main load-bearing part and a room-temperature insulating part that are stacked layer by layer. Three-layer insulation is achieved by the low-temperature insulating parts, the medium-temperature insulating parts and the room-temperature insulating parts, and heat leakage is small, thereby ensuring the working characteristics of the cold mass component. The load-bearing performance of the entire supporting structure is ensured by the first main load-bearing part and the second main load-bearing part, and the components only need to be stacked and connected layer by layer. The structure is simple and easy to process, and the requirements for structural processing accuracy are low, which can reduce production and processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a heat-insulating support structure for use in an ultra-low temperature environment provided by an embodiment of the utility model;

[0029] Figure 2 A partially enlarged structural schematic diagram of a thermal insulation support structure for use in an ultra-low temperature environment provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of a thermal insulation support structure for use in an ultra-low temperature environment proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] On the one hand, if Figure 1-2 As shown, the embodiment of the utility model provides a heat-insulating support structure for use in an ultra-low temperature environment, comprising:

[0032] A low-temperature insulation component (1), a first main load-bearing component (2), a medium-temperature insulation component (3), a second main load-bearing component (4) and a room-temperature insulation component (5);

[0033] The first main load-bearing member (2) is located between the low-temperature insulation member (1) and the medium-temperature insulation member (3), and the second main load-bearing member (4) is located between the medium-temperature insulation member (3) and the room-temperature insulation member (5).

[0034] The insulation support structure can be used in a cryostat. The structure of the cryostat can be various. For example, in one embodiment, the cryostat can include a vacuum cylinder. The vacuum cylinder can be made of stainless steel. The vacuum cylinder includes an inner cavity. The cold mass component and the insulation support structure are both located in the inner cavity. A liquid nitrogen cold screen can be set on the inner side of the vacuum cylinder. The cold screen is generally a copper screen or an aluminum screen. A cold screen tube filled with liquid nitrogen is set on it. The cold screen tube is coiled. The liquid nitrogen cold screen circulates liquid nitrogen to provide cooling for the inner cavity, thereby maintaining the low temperature environment in the inner cavity.

[0035] The insulating support structure can be arranged at multiple positions of the side wall of the inner cavity according to the different cold mass components to be supported. Only a single insulating support structure can be arranged in the inner cavity, or multiple insulating support structures can be arranged at different positions. The cold mass component mainly includes a superconducting cavity and a superconducting solenoid, and the low-temperature insulation member (1) is used to connect the cold mass component. The insulating support structure can be arranged on the bottom wall or the top wall of the inner cavity. The room temperature insulation member (5) is fixedly connected to the vacuum cylinder, and the temperature of the vacuum cylinder is room temperature, about 300K. The second main load-bearing member (4) is connected to the room temperature insulation member (5), and the medium temperature insulation member (3) is connected to the second main load-bearing member (4), and the second main load-bearing member (4) plays a supporting and weighing role. The temperature of the vacuum cylinder will be partially isolated by the room temperature insulation member (5), and part of the heat will be conducted to the second main load-bearing member (4), and then further blocked by the medium temperature insulation member (3). A first main load-bearing member (2) is arranged on the medium-temperature insulation member (3), a low-temperature insulation member (1) is arranged on the first main load-bearing member (2), and the low-temperature insulation member (1) is connected to a cold mass component. The temperature of the medium-temperature insulation member (3) is between 4K and 80K. After the heat is blocked by the medium-temperature insulation member (3), only a small part of the heat is transferred to the first main load-bearing member (2), and then further blocked by the low-temperature insulation member (1), thereby greatly reducing the heat transferred to the cold mass component, and ensuring that the temperature of the cold mass component is stable at 4K.

[0036] The structures and materials of the first main load-bearing member (2) and the second main load-bearing member (4) can be various. In order to ensure the supporting performance of the first main load-bearing member (2) and the second main load-bearing member (4), the first main load-bearing member (2) and the second main load-bearing member (4) need to have sufficient mechanical strength. For example, the first main load-bearing member (2) and the second main load-bearing member (4) can be made of stainless steel. In order to reduce the heat conduction of the first main load-bearing member (2) and the second main load-bearing member (4), the first main load-bearing member (2) and the second main load-bearing member (4) can both be hollow barrel structures, and the wall thickness of the first main load-bearing member (2) and the second main load-bearing member (4) should be as thin as possible, thereby reducing heat transfer by reducing the volume. The first main load-bearing member (2) and the second main load-bearing member (4) can be a cylinder, a square cylinder, etc. The low temperature insulation component (1) and the medium temperature insulation component (3) are respectively located at the two ends of the axial direction of the first main load-bearing component (2), and the medium temperature insulation component (3) and the room temperature insulation component (5) are respectively located at the two ends of the axial direction of the second main load-bearing component (4). The low temperature insulation component (1), the medium temperature insulation component (3) and the room temperature insulation component (5) are all flat annular components. The annular low temperature insulation component (1), the medium temperature insulation component (3) and the room temperature insulation component (5) are adapted to the shape of the end edges of the first main load-bearing component (2) and the second main load-bearing component (4) to which they are connected. The annular structure reduces the weight of the insulation support structure as a whole on the one hand, and facilitates the internal vacuuming of the insulation support structure on the other hand.

[0037] The insulating support structure and low-temperature thermostat for use in an ultra-low temperature environment proposed in the embodiments of the utility model mainly achieve thermal insulation by arranging low-temperature insulation parts, first main load-bearing parts, medium-temperature insulation parts, second main load-bearing parts and room-temperature insulation parts that are stacked layer by layer. Three-layer insulation is achieved by the low-temperature insulation parts, medium-temperature insulation parts and room-temperature insulation parts, and heat leakage is small, thereby ensuring the working characteristics of the cold mass component. The load-bearing performance of the entire supporting structure is ensured by the first main load-bearing parts and the second main load-bearing parts, and the various components only need to be stacked and connected layer by layer. The structure is simple and easy to process, and the requirements for structural processing accuracy are low, which can reduce production and processing costs.

[0038] The low temperature insulation component (1), the medium temperature insulation component (3) and the room temperature insulation component (5) play a role in heat insulation and can be made of a variety of materials with poor thermal conductivity, such as light, loose, porous or fibrous materials, which can block the conduction of heat due to the stagnant air inside. More specifically, the low temperature insulation component (1), the medium temperature insulation component (3) and the room temperature insulation component (5) can be made of glass fiber.

[0039] The annular low-temperature insulation member (1), medium-temperature insulation member (3), and room-temperature insulation member (5) may be connected to the first main load-bearing member (2) and the second main load-bearing member (4) in various ways, such as bonding, clamping, plugging, etc. In a more specific embodiment, the insulation support structure further includes: a plurality of bolts (6) and a plurality of nuts (7). The first main load-bearing member (2) and the low-temperature insulation member (1) are connected to each other, and the first main load-bearing member (2) and the medium-temperature insulation member (3) are connected to each other by at least one bolt (6) and at least one nut (7). The second main load-bearing member (4) and the medium-temperature insulation member (3) are connected to each other, and the second main load-bearing member (4) and the room-temperature insulation member (5) are connected to each other by at least one bolt (6) and at least one nut (7).

[0040] Any two adjacent parts can be connected by multiple pairs of bolts (6) and nuts (7), and the multiple pairs of bolts (6) and nuts (7) are evenly arranged on the circumference of the cylindrical first main load-bearing member (2) and the second main load-bearing member (4). For example, if there are 12 bolts (6) and nuts (7), the low-temperature insulation member (1) and the first main load-bearing member (2) are fixed by 4 pairs of bolts (6) and nuts (7), the medium-temperature insulation member (3), the first main load-bearing member (2) and the second main load-bearing member (4) are fixed by 4 pairs of bolts (6) and nuts (7), and the room-temperature insulation member (5) and the second main load-bearing member (4) are fixed by 4 pairs of bolts (6) and nuts (7). The method of fixing with bolts (6) and nuts (7) is simple to connect and has strong versatility. It does not require high precision in the structural processing of the first main load-bearing member (2), etc., thereby reducing production difficulty and cost.

[0041] In one embodiment, if Figure 2 As shown, the first main load-bearing component (2) includes a first load-bearing body (21), a first upper flange (22) and a first lower flange (23); the first load-bearing body (21) is a cylindrical structure; the first upper flange (22) and the first lower flange (23) are flat annular structures; the first upper flange (22) and the first lower flange (23) are respectively arranged at the edges of the openings at both ends of the first load-bearing body (21) and extend toward the outside of the first load-bearing body (21); the low-temperature heat-insulating component (1) is connected to the first upper flange (22); and the medium-temperature heat-insulating component (3) is connected to the first lower flange (23). The second main load-bearing component (4) comprises a second load-bearing body (41), a second upper flange (42) and a second lower flange (43); the second upper flange (42) and the second lower flange (43) are flat annular structures; the second load-bearing body (41) is a cylindrical structure; the second upper flange (42) and the second lower flange (43) are respectively arranged at the opening edges at both ends of the second load-bearing body (41) and extend toward the outside of the second load-bearing body (41); the medium-temperature insulation component (3) is connected to the second upper flange (42); and the room-temperature insulation component (5) is connected to the second lower flange (43).

[0042] By setting the flange, bolt connection is achieved on the one hand, and on the other hand, the contact area between the low-temperature insulation component (1), the medium-temperature insulation component (3) and the first main load-bearing component (2) is increased, and the relative position is more stable. Similarly, the contact area between the medium-temperature insulation component (3), the room-temperature insulation component (5) and the second main load-bearing component (4) is increased, and the relative position is more stable. At the same time, the problem of complex processing of the connection method such as embedding the low-temperature insulation component (1) into the first main load-bearing component (2) is avoided.

[0043] In one embodiment, the heat-insulating support structure further comprises: a plurality of heat-insulating gaskets (8). The heat-insulating gaskets (8) are sleeved on the bolts (6), the heat-insulating gaskets (8) are arranged between the first main bearing member (2) and the nut (7), and the heat-insulating gaskets (8) are arranged between the second main bearing member (4) and the nut (7).

[0044] Any combination of a bolt (6) and a nut (7) corresponds to an insulating gasket (8), and the insulating gasket (8) is made of a low thermal conductivity material, such as a glass fiber gasket, a resin gasket, a ceramic gasket, etc. In the aforementioned embodiment including the first upper flange (22) and the first lower flange (23), the first upper flange (22) and the first lower flange (23) are used to contact the insulating gasket (8), and the second upper flange (42) and the second lower flange (43) are used to contact the insulating gasket (8). By providing the insulating gasket (8), the heat conduction from the bolt (6) can be reduced, thereby further ensuring the thermal insulation performance of the overall insulating support structure.

[0045] In one embodiment, the heat-insulating support structure further comprises a cooling ring (9), the cooling ring (9) being connected to the second main load-bearing component (4), and the cooling ring (9) being used to connect to a cooling component.

[0046] The cooling ring (9) is made of stainless steel and can be integrally formed with the second main load-bearing member (4). The cooling ring (9) can be a flat ring structure, connected to the middle position of the height of the second main load-bearing member (4) and extending outward. The cooling member can be a component on a low-temperature thermostat, such as a liquid nitrogen cold screen. The cooling ring (9) is connected to the liquid nitrogen cold screen, and the temperature is 80K, which can assist in lowering the temperature of the second main load-bearing member (4).

[0047] On the other hand, the utility model also provides a low temperature thermostat, comprising any of the aforementioned insulating support structures for use in ultra-low temperature environments and a thermostat body. The thermostat body comprises a vacuum cylinder, the vacuum cylinder comprises an inner cavity, the insulating support structure is located in the inner cavity, and a room temperature insulating member (5) is connected to the vacuum cylinder. The low temperature thermostat comprises any of the aforementioned insulating support structures for use in ultra-low temperature environments, and the advantages of any of the aforementioned insulating support structures for use in ultra-low temperature environments are not repeated here.

[0048] In one embodiment, the cryostat further comprises a liquid nitrogen cold screen, which is used to cool the inner cavity. The cooling ring (9) of the thermal insulation support structure is connected to the liquid nitrogen cold screen. The connection can be made through a copper braid with good thermal conductivity, and then the liquid nitrogen cold screen can cool the cooling ring (9) and the second main bearing member (4).

[0049] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A thermal insulation support structure for use in ultra-low temperature environments, characterized in that: include: A low-temperature insulation component (1), a first main load-bearing component (2), a medium-temperature insulation component (3), a second main load-bearing component (4) and a room-temperature insulation component (5); The first main load-bearing component (2) is located between the low-temperature insulation component (1) and the medium-temperature insulation component (3), and the second main load-bearing component (4) is located between the medium-temperature insulation component (3) and the room-temperature insulation component (5).

2. The thermal insulation support structure for use in ultra-low temperature environments according to claim 1, characterized in that: The first main load-bearing component (2) and the second main load-bearing component (4) are both hollow barrel-shaped structures.

3. The thermal insulation support structure for use in ultra-low temperature environments according to claim 1, characterized in that: The low-temperature thermal insulation component (1), the medium-temperature thermal insulation component (3) and the room-temperature thermal insulation component (5) are all annular components.

4. The heat-insulating support structure for use in a super-low temperature environment according to claim 1, characterized in that: The low-temperature thermal insulation component (1), the medium-temperature thermal insulation component (3) and the room-temperature thermal insulation component (5) are made of glass fibers.

5. The heat-insulating support structure for use in a super-low temperature environment according to claim 1, characterized in that: The thermal insulation support structure further comprises: A plurality of bolts (6) and a plurality of nuts (7); The first main load-bearing component (2) and the low-temperature heat-insulating component (1), and the first main load-bearing component (2) and the medium-temperature heat-insulating component (3) are respectively connected by at least one bolt (6) and at least one nut (7); The second main load-bearing component (4) and the medium-temperature insulation component (3), as well as the second main load-bearing component (4) and the room-temperature insulation component (5) are connected respectively by at least one bolt (6) and at least one nut (7).

6. The heat-insulating support structure for use in ultra-low temperature environments according to claim 5, characterized in that: The first main load-bearing component (2) comprises a first load-bearing body (21), a first upper flange (22) and a first lower flange (23); the first load-bearing body (21) is a cylindrical structure; the first upper flange (22) and the first lower flange (23) are respectively arranged at the edges of the openings at both ends of the first load-bearing body (21) and extend toward the outside of the first load-bearing body (21); the low-temperature heat-insulating component (1) is connected to the first upper flange (22), and the medium-temperature heat-insulating component (3) is connected to the first lower flange (23); The second main load-bearing component (4) comprises a second load-bearing body (41), a second upper flange (42) and a second lower flange (43); the second load-bearing body (41) is a tubular structure; the second upper flange (42) and the second lower flange (43) are respectively arranged at the opening edges at both ends of the second load-bearing body (41) and extend toward the outside of the second load-bearing body (41); the medium-temperature insulation component (3) is connected to the second upper flange (42); and the room-temperature insulation component (5) is connected to the second lower flange (43).

7. The heat-insulating support structure for use in ultra-low temperature environments according to claim 5, characterized in that: The thermal insulation support structure further comprises: A plurality of thermal insulation gaskets (8); The heat insulating gasket (8) is sleeved on the bolt (6), the heat insulating gasket (8) is arranged between the first main load-bearing component (2) and the nut (7), and the heat insulating gasket (8) is arranged between the second main load-bearing component (4) and the nut (7).

8. The thermal insulation support structure for use in ultra-low temperature environments according to claim 1, characterized in that: The thermal insulation support structure further comprises: A cooling ring (9), the cooling ring (9) is connected to the second main load-bearing component (4), and the cooling ring (9) is used to connect a cooling component.

9. A cryostat, characterized in that: It comprises a heat-insulating support structure and a thermostat body for use in a super-low temperature environment as described in any one of claims 1 to 8; The thermostat body comprises a vacuum cylinder, the vacuum cylinder comprises an inner cavity, the insulation support structure is located in the inner cavity, and the room temperature insulation component (5) is connected to the vacuum cylinder.

10. The cryostat according to claim 9, characterized in that The cryostat further comprises a liquid nitrogen cold shield, which is used to cool the inner cavity; The cooling ring (9) of the thermal insulation support structure is connected to the liquid nitrogen cold shield.

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