Cold shield assembly and Dewar

Abstract

The utility model discloses a cold shield assembly and Dewar, the cold shield assembly is used for being installed on a connecting piece of an inner cylinder of the Dewar, the cold shield assembly comprises an anti-radiation layer, a cold shield layer, a heat insulation layer and a locking assembly, and the anti-radiation layer is arranged on the periphery of the connecting piece in a sleeving mode and makes contact with the inner wall of the inner cylinder of the Dewar; the cold shield layer sleeves the periphery of the connecting piece and supports the lower part of the anti-radiation layer; the heat insulation layer sleeves the periphery of the connecting piece, at least partially supports the cold shield layer and at least partially separates the cold shield layer from the connecting piece; the locking assembly sleeves and is connected to the connecting piece and is used for supporting the heat insulation layer. According to the cold shield assembly, heat radiation can be reduced, and then excessive loss of heat is reduced; heat conduction can be reduced, so that excessive loss of heat is further reduced; and meanwhile, the heat insulation layer, the cold shield layer and the anti-radiation layer can be stably connected to the connecting piece, so that the mounting stability is improved, and heat radiation, heat conduction and the like are further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Dewar, in particular to a cold screen assembly and a Dewar. BACKGROUND

[0002] The Dewar includes a Dewar outer cylinder and a Dewar inner cylinder. The Dewar inner cylinder stores low-temperature medium. A cold screen assembly is arranged in the neck pipe of the inner cavity of the Dewar inner cylinder, and the cold screen assembly can reduce heat radiation. However, some existing cold screen assemblies cannot isolate heat conduction, thereby causing heat loss and the like. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a cold screen assembly and a Dewar to solve the technical problems that the existing Dewar inner cylinder cannot isolate heat conduction, thereby causing heat loss and the like.

[0004] To solve the above technical problems, the present application provides a cold screen assembly for being installed on a connecting piece of a Dewar inner cylinder, the cold screen assembly comprising: a radiation-proof layer, which is sleeved on the outer periphery of the connecting piece and is in contact with the inner wall of the Dewar inner cylinder; a cold screen layer, which is sleeved on the outer periphery of the connecting piece and supports the lower part of the radiation-proof layer; a heat insulation layer, which is sleeved on the outer periphery of the connecting piece, and at least partially supports the cold screen layer and at least partially separates the cold screen layer and the connecting piece; and a locking assembly, which is sleeved on and connected to the connecting piece and is used for supporting the heat insulation layer.

[0005] The heat insulation layer comprises a heat insulation part and a supporting part connected to the heat insulation part, the heat insulation part separates the cold screen layer and the outer periphery of the connecting piece, and the upper part of the supporting part supports the bottom of the cold screen layer.

[0006] The heat insulation part has a transverse cross-sectional dimension smaller than that of the supporting part, the surface of the supporting part is provided with a supporting surface, and the supporting surface supports the bottom of the cold screen layer.

[0007] The locking assembly is releasably locked on the outer periphery of the connecting piece.

[0008] The locking assembly comprises a locking ring and a locking piece, the locking ring is provided with a locking part, the locking ring is sleeved on the connecting piece, and the locking piece is connected to the locking part and abuts against the outer periphery of the connecting piece.

[0009] The cold screen layer has the same size as the radiation-proof layer.

[0010] The radiation-proof layer is a polystyrene radiation-proof layer or a polyurethane radiation-proof layer; the cold screen layer is an aluminum cold screen layer or an alloy cold screen layer; and / or the heat insulation layer is a glass fiber and resin rolling composite heat insulation layer.

[0011] To solve the above technical problems, the present application provides a Dewar, which comprises: a Dewar inner cylinder provided with a connecting pipe, the connecting pipe being a connecting piece; and the cold screen assembly described above, which is arranged on the connecting pipe and located at the neck pipe of the Dewar inner cylinder.

[0012] The Dewar includes at least two cold screen assemblies, and the at least two cold screen assemblies are arranged in a stack from top to bottom.

[0013] The Dewar includes a Dewar outer cylinder, a flange cover, and a connecting pipe. The Dewar outer cylinder is arranged around the Dewar inner cylinder, and a vacuum layer is formed between the Dewar outer cylinder and the Dewar inner cylinder. The flange cover is arranged at the top end of the Dewar outer cylinder, and the connecting pipe is arranged on the flange cover and at least partially extends into the Dewar inner cylinder. The connecting pipe is at least one of a liquid inlet pipe, a liquid outlet pipe, and a gas outlet pipe.

[0014] The application provides a cold screen assembly. The cold screen assembly is arranged on a connecting pipe of a Dewar inner cylinder. The cold screen assembly includes a radiation-proof layer, a cold screen layer, a heat insulation layer, and a locking assembly. The radiation-proof layer is arranged around the connecting pipe and in contact with the inner wall of the Dewar inner cylinder. The cold screen layer is arranged around the connecting pipe and supports the lower part of the radiation-proof layer. The heat insulation layer is arranged around the connecting pipe. The heat insulation layer at least partially supports the cold screen layer and separates the cold screen layer from the connecting pipe. The locking assembly is arranged around and connected to the connecting pipe to support the heat insulation layer.

[0015] The radiation-proof layer, the cold screen layer, the heat insulation layer, and the locking assembly cooperate with each other to reduce heat radiation and heat conduction, thereby reducing excessive heat loss. The heat insulation layer, the cold screen layer, and the radiation-proof layer are stably connected to the connecting pipe, thereby improving the installation stability and reducing heat radiation and heat conduction. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0017] Figure 1 is a first partial structure schematic view of an embodiment of the cold screen assembly of the application;

[0018] Figure 2 is a structure schematic view of A shown in Figure 1

[0019] Figure 3 is a partial cross-sectional schematic view of an embodiment of the cold screen assembly of the application;

[0020] Figure 4 is a structure schematic view of B shown in Figure 3

[0021] Figure 5 ​​is a second partial structural schematic view of an embodiment of the cold screen assembly of the present application;

[0022] Figure 6 is Figure 5 is a structural schematic view of C shown in

[0023] Figure 7 is a structural schematic view of an embodiment of the dewar of the present application;

[0024] Figure 8 is a cross-sectional schematic view of an embodiment of the dewar of the present application;

[0025] Figure 9 is Figure 8 is a structural schematic view of D shown in

[0026] BRIEF DESCRIPTION OF DRAWINGS 10, cold screen assembly; 11, radiation shielding layer; 12, cold screen layer; 13, thermal insulation layer; 131, thermal insulation portion; 132, support portion; 14, locking assembly; 141, locking ring; 142, locking member; 100, dewar; 21, dewar inner cylinder; 22, dewar outer cylinder; 23, vacuum interlayer; 401, flange cover; 402, connecting pipe. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0028] Reference herein to“an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily referring to a particular alternative embodiment or set of alternative embodiments. It will be explicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments.

[0029] The cold screen assembly and the dewar provided by the present application will be described in detail below in combination with the embodiments.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 is a first partial structural schematic view of an embodiment of the cold screen assembly of the present application; Figure 2 is Figure 1 is a structural schematic view of A shown in Figure 3is a partial cross-sectional schematic view of an embodiment of a cold shield assembly of the present application; Figure 4 is Figure 3 is a structural schematic view of B. The present application provides a cold shield assembly. The cold shield assembly 10 is used for a connecting member (not shown in the figure) of a dewar inner cylinder (not shown in the figure). The cold shield assembly 10 is detachably or fixedly connected to the connecting member. The connecting member can be a part of the dewar inner cylinder, such as a connecting pipe 402. Alternatively, the connecting member can be a newly added part, which can be used to connect the cold shield assembly 10. The number of the connecting member can be one, two, three or more, but is not limited to these.

[0031] The cold shield assembly 10 comprises a radiation-proof layer 11, a cold shield layer 12, a thermal insulation layer 13 and a locking assembly 14. The radiation-proof layer 11 is sleeved on the outer periphery of the connecting member. At the same time, the radiation-proof layer 11 is in contact with the inner wall of the dewar inner cylinder. The radiation-proof layer 11 can reduce heat radiation, thereby preventing heat loss. The radiation-proof layer 11 can reduce heat radiation, and the specific structure and material thereof are not limited.

[0032] The cold shield layer 12 is sleeved on the outer periphery of the connecting member. The cold shield layer 12 supports the lower part of the radiation-proof layer 11. That is, the cold shield layer 12 is located below the radiation-proof layer 11 and can support the radiation-proof layer 11 to some extent, so that the radiation-proof layer 11 is stably sleeved on the outer periphery of the connecting member. The cold shield layer 12 can reduce heat radiation, thereby preventing heat loss. The cold shield layer 12 can reduce heat radiation, and the specific structure and material thereof are not limited.

[0033] The thermal insulation layer 13 is sleeved on the outer periphery of the connecting member. The thermal insulation layer 13 at least partially supports the cold shield layer 12, that is, the thermal insulation layer 13 can at least partially support the cold shield layer 12 to some extent, so that the cold shield layer 12 is stably sleeved on the outer periphery of the connecting member. At the same time, the thermal insulation layer 13 at least partially separates the cold shield layer 12 and the connecting member, that is, the thermal insulation layer 13 can at least partially play a certain heat insulation role, which can reduce the heat conduction between the cold shield layer 12 and the connecting member. The thermal insulation layer 13 can play a supporting and isolating role, and the specific structure and material thereof are not limited.

[0034] The locking assembly 14 is sleeved on the outer periphery of the connecting member. At the same time, the locking assembly 14 is connected to the connecting member. When the locking assembly 14 is connected to the connecting member, the locking assembly 14 is locked to the connecting member, at this time the locking assembly 14 can fix the thermal insulation layer 13, so that the thermal insulation layer 13 at least partially supports the cold shield layer 12 and at least partially separates the cold shield layer 12 and the connecting member. After the cold shield layer 12 is limited by the thermal insulation layer 13, the cold shield layer 12 further limits the radiation-proof layer 11. The locking assembly 14 can play a locking role, and the specific structure thereof is not limited.

[0035] Through the cooperation of the above-mentioned radiation-proof layer 11, cold screen layer 12, heat insulation layer 13 and locking assembly 14, not only can reduce heat radiation, thereby reducing excessive heat loss; but also can reduce heat conduction, thereby further reducing excessive heat loss; at the same time, the heat insulation layer 13, the cold screen layer 12 and the radiation-proof layer 11 are stably connected to the connecting piece, thereby improving the installation stability, thereby reducing heat radiation and heat conduction, etc.

[0036] Please refer to Figure 5 and Figure 6 , Figure 5 is a second partial structure schematic view of an embodiment of the cold screen assembly of the present application; Figure 6 is Figure 5 the structure schematic view of C shown in. In combination with Figures 1 to 4 , in some embodiments, the heat insulation layer 13 includes a heat insulation part 131 and a support part 132. The heat insulation part 131 and the support part 132 are detachably connected or fixedly connected. In this embodiment, the heat insulation part 131 and the support part 132 are integrally formed. The heat insulation part 131 separates the cold screen layer 12 and the outer periphery of the connecting piece, which can reduce heat conduction between the cold screen layer 12 and the connecting piece, thereby reducing excessive heat loss. The heat insulation part 131 is located on the upper part of the support part 132. The upper part of the support part 132 supports the bottom of the cold screen layer 12, which not only can support the cold screen layer 12 to some extent, so that the cold screen layer 12 is stably sleeved on the connecting piece; but also after the cold screen layer 12 is limited, the cold screen layer 12 further limits the support of the radiation-proof layer 11, so that the radiation-proof layer 11 can be stably sleeved on the outer periphery of the connecting piece.

[0037] Through the cooperation of the above-mentioned heat insulation part 131, support part 132, cold screen layer 12 and connecting piece, not only can reduce heat conduction between the cold screen layer 12 and the connecting piece, thereby reducing excessive heat loss; but also can make the cold screen layer 12 and the radiation-proof layer 11 stably sleeved on the connecting piece, thereby improving the installation stability of the cold screen assembly 10.

[0038] Specifically, the transverse cross-sectional dimension of the heat insulation part 131 is smaller than the transverse cross-sectional dimension of the support part 132. The transverse cross-section is a horizontal cross-section, which is a cross-section parallel to the horizontal plane. By limiting the size of the transverse cross-sectional dimension of the heat insulation part 131 and the support part 132, the heat insulation layer 13 at least partially supports the cold screen layer 12 and at least partially separates the cold screen layer 12 and the connecting piece. The surface of the support part 132 is provided with a support surface (not shown in the figure). The support surface supports the bottom of the cold screen layer 12. By limiting the specific structure shape of the heat insulation part 131 and the support part 132, the stability of the heat insulation layer 13 installed on the cold screen assembly 10 can be improved. The transverse cross-sectional shape of the heat insulation part 131 and the transverse cross-sectional shape of the support part 132 can be but not limited to circular and elliptical, etc.

[0039] Please continue to refer toFigures 1 to 6 In some embodiments, the locking assembly 14 can be releasably locked to the outer periphery of the connecting member. When the locking assembly 14 is locked to the outer periphery of the connecting member, it is used to directly fix the thermal insulation layer 13 and to fix the cold shield layer 12 and the radiation shielding layer 11, etc. in a spaced manner. Alternatively, when the locking assembly 14 is released from the outer periphery of the connecting member, the thermal insulation layer 13, the cold shield layer 12 and the radiation shielding layer 11 can meet the disassembly requirements, etc. By limiting the locking assembly 14 to be releasably locked to the outer periphery of the connecting member, the installation and disassembly of the cold shield assembly 10 can be facilitated, etc. The above-mentioned locking assembly 14 can be, but is not limited to, a clamping, a plug-in and a bolt, etc.

[0040] Specifically, the locking assembly 14 includes a locking ring 141 and a locking member 142. The locking ring 141 is provided with a locking portion (not shown in the figure). The locking portion can be detachably or fixedly connected to the locking ring 141. When the locking portion is opened, the locking ring 141 can be opened; when the locking portion is closed, the locking ring 141 can be closed. The locking ring 141 is sleeved on the connecting member. The locking member 142 is connected to the locking portion; at the same time, the locking member 142 abuts against the outer periphery of the connecting member. Through the cooperation of the above-mentioned locking ring 141, the locking portion and the locking member 142, not only the locking assembly 14 can be quickly disassembled and installed, but also the structure is simple and easy to obtain, etc.

[0041] Further, the locking ring 141 can include two sub-locking rings (not shown in the figure). One end of the two sub-locking rings is hingedly connected, and the locking portion is arranged between the other ends of the two sub-locking rings. The locking member 142 can be releasably locked to the locking portion.

[0042] In the process of supporting the lower part of the radiation shielding layer 11 by the cold shield layer 12, the cold shield layer 12 can partially support the radiation shielding layer 11, i.e. the size of the cold shield layer 12 can be smaller than the size of the radiation shielding layer 11; or the cold shield layer 12 can fully support the radiation shielding layer 11, i.e. the size of the cold shield layer 12 can be completely the same as the size of the radiation shielding layer 11.

[0043] As in a specific embodiment, the size of the cold shield layer 12 is the same as the size of the radiation shielding layer 11, i.e. the cold shield layer 12 can fully support the radiation shielding layer 11, which not only can increase the support area between the cold shield layer 12 and the radiation shielding layer 11, thereby improving the stability of the installation of the radiation shielding layer 11 on the connecting member; but also can further reduce the heat radiation. When the size of the cold shield layer 12 is the same as the size of the radiation shielding layer 11, the outer periphery of the cold shield layer 12 can be in contact with the inner wall of the Dewar inner cylinder.

[0044] In some embodiments, the radiation protection layer 11 can be, but is not limited to, a polystyrene radiation protection layer (not shown in the figure) or a polyurethane radiation protection layer (not shown in the figure). When the radiation protection layer 11 is a polystyrene radiation protection layer, the polystyrene radiation protection layer is made of polystyrene material. The polystyrene material has excellent low-temperature resistance, can maintain good mechanical properties and dimensional stability, and thus can reduce heat radiation and the like. During use, the polystyrene radiation protection layer can reduce the risk of slagging and thus reduce the impact on the purity of low-temperature medium and the like. When the radiation protection layer 11 is a polyurethane radiation protection layer, the polyurethane radiation protection layer is made of polyurethane material. The polyurethane material has low-temperature performance and can also reduce heat radiation and the like.

[0045] When the radiation protection layer 11 is the above-mentioned polystyrene radiation protection layer or polyurethane radiation protection layer, and the size of the cold shield layer 12 is the same as that of the radiation protection layer 11, the cold shield layer 12 can support the radiation protection layer 11 and reduce the risk of slagging and the like.

[0046] In some embodiments, the cold shield layer 12 is an aluminum cold shield layer (not shown in the figure) or an alloy cold shield layer (not shown in the figure). The aluminum cold shield layer is made of aluminum material. The aluminum material has good plasticity, corrosion resistance, electrical conductivity and thermal conductivity, and can reduce the risk of slagging and the like. The alloy cold shield layer is made of alloy material. The alloy material can be, but is not limited to, stainless steel. The alloy material also has good plasticity, corrosion resistance, electrical conductivity and thermal conductivity.

[0047] In some embodiments, the thermal insulation layer 13 is a glass fiber and resin rolling composite thermal insulation layer (not shown in the figure). The glass fiber and resin rolling composite thermal insulation layer is made of glass fiber and resin rolling composite material. The glass fiber and resin rolling composite material not only has an isolation effect, which can reduce heat conduction between the cold shield layer 12 and the connecting piece, but also has a certain supporting effect, which is used to support the cold shield layer 12 and the like.

[0048] In some embodiments, the radiation protection layer 11 is provided with a radiation protection hole (not shown in the figure). The cold shield layer 12 is provided with a cold shield hole (not shown in the figure). The thermal insulation layer 13 is provided with a thermal insulation hole (not shown in the figure). The radiation protection hole of the radiation protection layer 11, the cold shield hole of the cold shield layer 12 and the thermal insulation hole of the thermal insulation layer 13 are all sleeved on the outer periphery of the connecting piece. The thermal insulation layer 13 separates the cold shield hole and the outer periphery of the connecting piece. The size of the cold shield hole is greater than that of the radiation protection hole. The number of the above-mentioned radiation protection holes in the radiation protection layer 11, the number of the cold shield holes in the cold shield layer 12 and the number of the thermal insulation holes in the thermal insulation layer 13 can be determined according to the number of the connecting pieces. When the number of the connecting pieces is three, the number of the above-mentioned radiation protection holes, cold shield holes and thermal insulation holes can all be three.

[0049] Please refer to Figure 7 , Figure 8 and Figure 9 ,Figure 7 This is a schematic diagram of the structure of one embodiment of the Dewar of this application; Figure 8 This is a cross-sectional schematic diagram of an embodiment of the Dewar of this application; Figure 9 yes Figure 8 The diagram shows the structure of D. (Combined with...) Figures 1 to 6 This application provides a Dewar 100. The Dewar 100 includes an inner cylinder 21 and a cooling shield assembly 10. The inner cylinder 21 is provided with a connecting pipe 402. The connecting pipe 402 is detachably or fixedly connected to the inner cylinder 21. The connecting pipe 402 is a component of the Dewar 100 itself and can be used as a connector, for liquid inlet and outlet, etc. The cooling shield assembly 10 is disposed on the connecting pipe 402. The cooling shield assembly 10 is located at the neck of the inner cylinder 21 and can reduce heat radiation and heat conduction. It should be noted that the cooling shield assembly 10 in this embodiment is the same as the cooling shield assembly 10 described in the above embodiments, and will not be repeated here.

[0050] By using the aforementioned cold shield assembly 10, the Dewar 100 can not only reduce heat radiation and thus reduce excessive heat loss, but also reduce heat conduction and thus further reduce excessive heat loss. At the same time, it can stably connect the heat insulation layer 13, the cold shield layer 12, and the radiation shielding layer 11 to the connector, thereby improving installation stability and reducing heat radiation and heat conduction.

[0051] In some embodiments, the Dewar 100 includes at least two cold screen components 10. The at least two cold screen components 10 are stacked sequentially on the connecting pipe 402, which can reduce heat radiation and heat conduction, thereby reducing excessive heat loss. The number of cold screen components 10 can be, but is not limited to, two, three, or more than four, and the number can be determined according to actual needs, and is not limited here.

[0052] In some embodiments, the Dewar 100 further includes an outer Dewar cylinder 22. The outer Dewar cylinder 22 is fitted around the outer periphery of the inner Dewar cylinder 21. A vacuum interlayer 23 is formed between the outer Dewar cylinder 22 and the inner Dewar cylinder 21. A cryogenic medium is stored in the inner cavity of the Dewar 100. The cryogenic medium may be, but is not limited to, liquid hydrogen. A flange cover 401 is disposed at the top of the outer Dewar cylinder 22. The flange cover 401 is detachably or fixedly connected to the top of the outer Dewar cylinder 22. In this embodiment, the flange cover 401 is connected to the top of the outer Dewar cylinder 22 by bolts or the like. A connecting pipe 402 is disposed on the flange cover 401. The connecting pipe 402 is detachably or fixedly connected to the flange cover 401. In this embodiment, the connecting pipe 402 is welded to the end of the flange cover 401 facing the inner Dewar cylinder 21. When the connecting pipe 402 is installed on the flange cover 401, the connecting pipe 402 extends at least partially into the Dewar inner cylinder 21 so that the cold shield assembly 10 is installed on the connecting pipe 402.

[0053] Through the cooperation of the dewar outer cylinder 22, the dewar inner cylinder 21, the flange cover 401, the connecting pipe 402 and the cold screen assembly 10, the excessive heat loss of the dewar inner cylinder 21 can be reduced. When the cold screen assembly 10 needs to be disassembled and installed, the flange cover 401 is disconnected from the top end of the dewar outer cylinder 22, and then the flange cover 401 and the cold screen assembly 10 can be lifted out for inspection.

[0054] In some embodiments, the connecting pipe 402 is at least one of the liquid inlet pipe (not shown in the figure), the liquid outlet pipe (not shown in the figure) and the gas outlet pipe (not shown in the figure). The connecting pipe 402 can be one, two or all of the liquid inlet pipe, the liquid outlet pipe and the gas outlet pipe. The connecting pipe 402 is a part of the dewar 100, which can reduce the use of parts and reduce costs.

[0055] The terms "first", "second", "third" in the present application are only for descriptive purpose, and cannot be understood as indicating the number of the technical features. Therefore, the features with "first", "second", "third" can include at least one of the features explicitly or implicitly. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components, and if the specific posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover the non-exclusive inclusion. For example, the process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0056] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A cold screen assembly for mounting to a connection of a dewar inner vessel, the cold screen assembly comprising: The cold shield assembly comprises: a radiation-proof layer, sleeved on the outer periphery of the connecting pipe and in contact with the inner wall of the inner cylinder of the Dewar; a cold shield layer, sleeved on the outer periphery of the connecting pipe and supporting the lower part of the radiation-proof layer; a thermal insulation layer, sleeved on the outer periphery of the connecting pipe, at least partially supporting the cold shield layer and at least partially separating the cold shield layer and the connecting pipe; a locking assembly, sleeved on and connected to the connecting pipe, for supporting the thermal insulation layer.

2. The cold-shield assembly of claim 1, wherein, The thermal insulation layer comprises a thermal insulation part and a supporting part connected to the thermal insulation part, the thermal insulation part separating the cold shield layer and the outer periphery of the connecting pipe, and the supporting part supporting the bottom of the cold shield layer.

3. The cold-shield assembly of claim 2, wherein, The thermal insulation part has a smaller transverse cross-sectional dimension than the supporting part, and the surface of the supporting part is provided with a supporting surface for supporting the bottom of the cold shield layer.

4. The cold-shield assembly of claim 1, wherein, The locking assembly is releasably locked on the outer periphery of the connecting pipe.

5. The cold-shield assembly of claim 4, wherein, The locking assembly comprises a locking ring provided with a locking part and a locking member connected to the locking part and abutting against the outer periphery of the connecting pipe.

6. The cold-shield assembly of claim 1, wherein, The cold shield layer has the same size as the radiation-proof layer.

7. The cold-shield assembly of claim 1, wherein, The radiation-proof layer is a polystyrene radiation-proof layer or a polyurethane radiation-proof layer. The cold shield layer is an aluminum cold shield layer or an alloy cold shield layer. The thermal insulation layer is a glass fiber and resin rolling composite thermal insulation layer.

8. A dewar, characterized by, The Dewar comprises: an inner cylinder of the Dewar provided with a connecting pipe, which is the connecting pipe; the cold shield assembly according to any one of claims 1 to 7, which is arranged on the connecting pipe and located at the neck pipe of the inner cylinder of the Dewar.

9. The Dewar of claim 8, wherein, The Dewar comprises at least two cold shield assemblies arranged in sequence and stacked one on another on the connecting pipe.

10. The Dewar of claim 8, wherein, The Dewar comprises: an outer cylinder of the Dewar, sleeved on the outer periphery of the inner cylinder of the Dewar, and forming a vacuum interlayer between the outer cylinder and the inner cylinder of the Dewar; a flange cover arranged at the top end of the outer cylinder of the Dewar, and the connecting pipe is arranged on the flange cover and at least partially extends into the inner cylinder of the Dewar; and / or the connecting pipe is at least one of an inlet pipe, an outlet pipe and a gas outlet pipe.

Images