Low magnetic noise thermal radiation shielding structure

Abstract

The utility model provides a low magnetic noise thermal radiation shielding structure, which relates to the field of low-temperature superconducting weak magnetic detection and comprises an outer layer, a middle layer is arranged at the bottom of the outer layer, an inner layer is arranged at the bottom of the middle layer, and the middle layer comprises epoxy resin and a conductor structure. According to the utility model, the outer layer, the middle layer and the inner layer are arranged, and the metal wires or strips are cooled through volatilized cold helium at the neck part of the non-magnetic Dewar, so that the whole glass fiber layer is cooled, the glass fiber layer forms integral heat radiation shielding, the heat radiation of the wall of the liquid helium main container is reduced, and the effect of reducing the volatilization of liquid helium is achieved; the integrity equivalent to metal heat radiation shielding is realized, the heat radiation of the liquid helium main container is obviously reduced, and the liquid helium volatilization rate is reduced; meanwhile, the eddy current problem existing in overall metal shielding is avoided, the SQUID has extremely high sensitivity and detection precision, and the structure is flexible in shape and can be of a cylinder structure, a flat plate structure or an irregular shape.

Description

Technical Field

[0001] The utility model belongs to the field of low-temperature superconducting weak magnetic detection, in particular to a low-magnetic noise thermal radiation shielding structure. Background Art

[0002] The non-magnetic liquid helium dewar is an experimental device used for magnetic and cryogenic experiments. It consists of a liquid helium cooling system and a dewar magnet. In order to achieve the ultra-high sensitivity and detection accuracy of SQU ID, its mechanical structure is made of all-glass fiber reinforced composite materials; the role of the thermal radiation shield in the non-magnetic liquid helium dewar is to recover the cold carried by the volatile helium gas, form an intermediate temperature, reduce the thermal radiation of the liquid helium main container wall, and play a role in reducing the volatilization of liquid helium. In principle, the overall metal thermal radiation shield is most conducive to reducing the thermal radiation of the liquid helium main container. However, the eddy current formed by the overall metal thermal radiation shield causes serious system noise, and the sensitivity of SQU ID is greatly reduced, and it cannot work normally;

[0003] Cutting the overall metal thermal radiation shield into wires or strips and then assembling them can significantly reduce the interference of eddy currents. However, the disadvantage of this method is that it is difficult to form uniform spacing when arranging the metal wires or strips, it is difficult to form a regular plane or cylindrical surface, and it is difficult to form an overall cooling shield, resulting in the gaps between the metal wires or strips forming heat radiation channels, thereby reducing the efficiency of the thermal radiation shielding.

[0004] In summary, the utility model provides a low magnetic noise thermal radiation shielding structure to solve the above problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The low magnetic noise heat radiation shielding structure comprises an outer layer, a middle layer is arranged at the bottom of the outer layer, an inner layer is arranged at the bottom of the middle layer, and the middle layer comprises epoxy resin and a conductor structure.

[0007] Furthermore, in the present invention, the inner layer is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.05-0.2 mm, and the number of glass fiber cloth layers is 3-15.

[0008] Furthermore, in the utility model, the conductor structure includes a circular cross-section conductor and a rectangular cross-section conductor, and the conductor structure material includes pure copper, copper alloy, high-purity aluminum, aluminum alloy, gold, silver and ceramic.

[0009] Furthermore, in the present invention, the diameter of the circular cross-section conductor is 0.2-1.5 mm, the thickness of the conductor structure is 0.2-1.5 mm, and the width is 2-20 mm.

[0010] Furthermore, in the present invention, the outer layer is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.05-0.1 mm, and the number of glass fiber cloth layers is 3-10.

[0011] Furthermore, in the present invention, the outer layer, the middle layer and the inner layer are solidified and formed under a step temperature system.

[0012] Beneficial effects: The utility model has the following beneficial effects:

[0013] The utility model provides an outer layer, an intermediate layer and an inner layer, and the metal wire or strip is cooled by the volatilized cold helium gas of the non-magnetic Dewar neck, thereby cooling the entire glass fiber layer, so that the glass fiber layer forms an overall thermal radiation shield, reduces the thermal radiation of the liquid helium main container wall, plays a role in reducing the volatilization of liquid helium, achieves integrity equivalent to that of a metal thermal radiation shield, significantly reduces the thermal radiation of the liquid helium main container, and reduces the volatilization rate of liquid helium; at the same time, the eddy current problem existing in the overall metal shield is avoided, so that the SQU ID has extremely high sensitivity and detection accuracy, and the structure is flexible in shape, and can be a cylindrical structure, a flat plate structure, or an irregular shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of low magnetic noise thermal radiation shielding structure formed by circular cross-section conductor;

[0015] Figure 2 Schematic diagram of the low magnetic noise thermal radiation shielding structure formed by a rectangular cross-section conductor.

[0016] In the figure:

[0017] 1. Outer layer; 2. Middle layer; 21. Epoxy resin; 22. Conductor structure; 221. Circular cross-section conductor; 222. Rectangular cross-section conductor; 3. Inner layer. DETAILED DESCRIPTION

[0018] In order to better understand the technical content of the utility model, specific embodiments are cited and described as follows in conjunction with the accompanying drawings. In this disclosure, various aspects of the utility model are described with reference to the accompanying drawings, and many illustrative embodiments are shown in the accompanying drawings. The embodiments of the present disclosure are not necessarily defined to include all aspects of the utility model. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the utility model are not limited to any implementation method. In addition, some aspects disclosed in the utility model can be used alone, or used in any appropriate combination with other aspects disclosed in the utility model.

[0019] Example 1

[0020] like Figure 1 and 2 As shown, the first embodiment of the utility model provides a low magnetic noise thermal radiation shielding structure, including an outer layer 1, a middle layer 2 is arranged at the bottom of the outer layer 1, an inner layer 3 is arranged at the bottom of the middle layer 2, and the middle layer 2 includes an epoxy resin 21 and a conductor structure 22.

[0021] The inner layer 3 is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the thickness of the glass fiber cloth is 0.05-0.2 mm, and the number of layers of the glass fiber cloth is 3-15.

[0022] The conductor structure 22 includes a circular cross-section conductor 221 and a rectangular cross-section conductor 222 . The conductor structure 22 is made of pure copper, copper alloy, high-purity aluminum, aluminum alloy, gold, silver and ceramic.

[0023] The diameter of the circular cross-section conductor 221 is 0.2-1.5 mm, the thickness of the conductor structure 22 is 0.2-1.5 mm, and the width is 2-20 mm.

[0024] The outer layer 1 is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the thickness of the glass fiber cloth is 0.05-0.1 mm, and the number of layers of the glass fiber cloth is 3-10.

[0025] The outer layer 1, the middle layer 2 and the inner layer 3 are solidified and formed under a step temperature system.

[0026] like Figure 1 and 2 As shown, the metal wire or strip is cooled by the volatilized cold helium gas in the neck of the non-magnetic Dewar, and then the entire glass fiber layer is cooled, so that the glass fiber layer forms an overall thermal radiation shield, reduces the thermal radiation of the liquid helium main container wall, plays a role in reducing the volatilization of liquid helium, and achieves the integrity equivalent to the metal thermal radiation shield, significantly reduces the thermal radiation of the liquid helium main container, and reduces the volatilization rate of liquid helium; at the same time, the eddy current problem existing in the overall metal shield is avoided, so that the SQU ID has extremely high sensitivity and detection accuracy. The structure is flexible in shape and can be a cylindrical structure, a flat plate structure, or an irregular shape.

[0027] Example 2

[0028] Reference Figure 1 and 2 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0029] In this embodiment, an outer layer 1 is included. An intermediate layer 2 is disposed at the bottom of the outer layer 1 . An inner layer 3 is disposed at the bottom of the intermediate layer 2 . The intermediate layer 2 includes an epoxy resin 21 and a conductor structure 22 .

[0030] The inner layer 3 is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.05 mm, and the number of layers of the glass fiber cloth is 3.

[0031] The conductor structure 22 includes a circular cross-section conductor 221 and a rectangular cross-section conductor 222 . The circular cross-section conductor 221 and the conductor structure 22 are made of pure copper and copper alloy, respectively.

[0032] The diameter of the circular cross-section conductor 221 is 0.2 mm, and the thickness and width of the conductor structure 22 are 0.2 mm and 2 mm, respectively.

[0033] The outer layer 1 is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.05 mm, and the number of layers of the glass fiber cloth is 3.

[0034] The outer layer 1, the middle layer 2 and the inner layer 3 are solidified and formed under a step temperature system.

[0035] like Figure 1 and 2 As shown, the metal wire or strip is cooled by the volatilized cold helium gas in the neck of the non-magnetic Dewar, and then the entire glass fiber layer is cooled, so that the glass fiber layer forms an overall thermal radiation shield, reduces the thermal radiation of the liquid helium main container wall, plays a role in reducing the volatilization of liquid helium, and achieves the integrity equivalent to the metal thermal radiation shield, significantly reduces the thermal radiation of the liquid helium main container, and reduces the volatilization rate of liquid helium; at the same time, the eddy current problem existing in the overall metal shield is avoided, so that the SQU ID has extremely high sensitivity and detection accuracy. The structure is flexible in shape and can be a cylindrical structure, a flat plate structure, or an irregular shape.

[0036] Example 3

[0037] Reference Figure 1 and 2 , which is the third embodiment of the utility model, and this embodiment is based on the previous two embodiments.

[0038] In this embodiment, an outer layer 1 is included. An intermediate layer 2 is disposed at the bottom of the outer layer 1 . An inner layer 3 is disposed at the bottom of the intermediate layer 2 . The intermediate layer 2 includes an epoxy resin 21 and a conductor structure 22 .

[0039] The inner layer 3 is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.2 mm, and the number of glass fiber cloth layers is 15.

[0040] The conductor structure 22 includes a circular cross-section conductor 221 and a rectangular cross-section conductor 222 , and the circular cross-section conductor 221 and the rectangular cross-section conductor 222 are made of high-purity aluminum and aluminum alloy, respectively.

[0041] The diameter of the circular cross-section conductor 221 is 1.5 mm, and the thickness and width of the conductor structure 22 are 1.5 mm and 20 mm respectively.

[0042] The outer layer 1 is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.1 mm, and the number of glass fiber cloth layers is 10.

[0043] The outer layer 1, the middle layer 2 and the inner layer 3 are solidified and formed under a step temperature system.

[0044] like Figure 1 and 2 As shown, the metal wire or strip is cooled by the volatilized cold helium gas in the neck of the non-magnetic Dewar, and then the entire glass fiber layer is cooled, so that the glass fiber layer forms an overall thermal radiation shield, reduces the thermal radiation of the liquid helium main container wall, plays a role in reducing the volatilization of liquid helium, and achieves the integrity equivalent to the metal thermal radiation shield, significantly reduces the thermal radiation of the liquid helium main container, and reduces the volatilization rate of liquid helium; at the same time, the eddy current problem existing in the overall metal shield is avoided, so that the SQU ID has extremely high sensitivity and detection accuracy. The structure is flexible in shape and can be a cylindrical structure, a flat plate structure, or an irregular shape.

[0045] When in use, the metal wire or strip is cooled by the volatilized cold helium gas in the neck of the non-magnetic Dewar, and then the entire glass fiber layer is cooled, so that the glass fiber layer forms an overall thermal radiation shield, reduces the thermal radiation of the wall of the liquid helium main container, plays a role in reducing the volatilization of liquid helium, and achieves the integrity equivalent to the metal thermal radiation shield, significantly reduces the thermal radiation of the liquid helium main container, and reduces the volatilization rate of liquid helium; at the same time, it avoids the eddy current problem of the overall metal shielding, so that the SQU ID has extremely high sensitivity and detection accuracy. The structure is flexible in shape and can be a cylindrical structure, a flat plate structure, or an irregular shape.

[0046] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented through simple programming by technicians in this field, which is common knowledge in the field. This application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0047] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A low magnetic noise thermal radiation shielding structure, comprising an outer layer (1), characterized in that: An intermediate layer (2) is arranged at the bottom of the outer layer (1), an inner layer (3) is arranged at the bottom of the intermediate layer (2), and the intermediate layer (2) comprises epoxy resin (21) and a conductor structure (22).

2. The low magnetic noise thermal radiation shielding structure according to claim 1, characterized in that: The inner layer (3) is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.05-0.2 mm, and the number of glass fiber cloth layers is 3-15.

3. The low magnetic noise thermal radiation shielding structure according to claim 1, characterized in that: The conductor structure (22) comprises a circular cross-section conductor (221) and a rectangular cross-section conductor (222); the conductor structure (22) is made of materials including pure copper, copper alloy, high-purity aluminum, aluminum alloy, gold, silver and ceramic.

4. The low magnetic noise thermal radiation shielding structure according to claim 3, characterized in that: The diameter of the circular cross-section conductor (221) is 0.2-1.5 mm, and the thickness of the conductor structure (22) is 0.2-1.5 mm, and the width is 2-20 mm.

5. The low magnetic noise thermal radiation shielding structure according to claim 1, characterized in that: The outer layer (1) is composed of multiple layers of glass fiber cloth pre-impregnated with epoxy resin, the glass fiber cloth has a thickness of 0.05-0.1 mm, and the number of glass fiber cloth layers is 3-10.

6. The low magnetic noise thermal radiation shielding structure according to claim 1, characterized in that: The outer layer (1), the middle layer (2) and the inner layer (3) are solidified and formed under a step temperature system.

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