Extremely-low-temperature-resistant high-thermal-conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly

Abstract

The utility model discloses an extremely low temperature resistant high thermal conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly, comprising a cable unit and a connector unit, the cable unit comprises a cable inner conductor, a cable dielectric layer and a cable shielding layer, the cable inner conductor is arranged in the cable dielectric layer, and the cable shielding layer is arranged in the cable dielectric layer. The cable dielectric layer is arranged in the cable shielding layer, the cable dielectric layer is used for fixing and supporting the cable inner conductor and the cable shielding layer, the shell is connected with the cable shielding layer, the connector inner conductor is connected with the cable inner conductor, and the connector inner conductor is connected with the connector inner conductor. The connector unit comprises a sealing gasket, a clamping ring, a threaded sleeve, a connector inner conductor, a connector medium, a shell and a medium sheet, the sealing gasket and the clamping ring are installed between the shell and the threaded sleeve, and the high-heat-conduction non-magnetic connector has the advantages that high heat conduction and non-magnetic performance are achieved, and good transmission performance can still be kept in an extremely low temperature environment. In addition, the whole assembly is simple in parts, easy to assemble and also easy to produce on a large scale.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field especially relates to a kind of SMA type semi-flexible braided type coaxial cable assemblies of extremely low temperature resistant high thermal conductivity non-magnetic. BACKGROUND

[0002] In recent years, quantum computing technology and industry show accelerated development trend, has become the focus of the science and technology circle and business circle. Dilution refrigerator is a kind of high-end scientific instruments that can provide near absolute zero environment, and is widely used in condensed matter physics, materials science, particle physics and even astronomical exploration and other scientific fields, and is an irreplaceable key equipment in quantum computing research. Microwave components are needed in dilution refrigerator, and cable assembly is essential for the connection of these components, and the signal needs to be successfully input from room temperature 300K to the bottom layer 10mK temperature of the refrigerator through the cable.

[0003] The existing microwave cable assembly cannot quickly transfer and dissipate high-strength heat while ensuring performance, has a complicated structure, is not easy to process and assemble, and cannot meet the signal complete transmission in extremely low temperature and non-magnetic environment.

[0004] Therefore, a SMA type semi-flexible braided type coaxial cable assembly of extremely low temperature resistant high thermal conductivity non-magnetic is needed to solve the above problems. SUMMARY

[0005] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the problems of the above SMA type semi-flexible braided type coaxial cable assembly of extremely low temperature resistant high thermal conductivity non-magnetic, the utility model is proposed.

[0007] Therefore, the utility model aims to provide a SMA type semi-flexible braided type coaxial cable assembly of extremely low temperature resistant high thermal conductivity non-magnetic, which combines SMA type coaxial connector and semi-flexible braided type coaxial cable to realize high thermal conductivity and reliable transmission performance, and can work in extremely low temperature and non-magnetic environment.

[0008] The utility model provides the following technical scheme: a SMA type semi-flexible braided type coaxial cable assembly of extremely low temperature resistant high thermal conductivity non-magnetic, comprising:

[0009] A cable unit includes a cable inner conductor, a cable medium layer and a cable shielding layer, the cable inner conductor is arranged inside the cable medium layer, the cable medium layer is arranged inside the cable shielding layer, and the cable medium layer is used for fixing and supporting the cable inner conductor and the cable shielding layer;

[0010] A connector unit includes a sealing pad, a snap ring, a sleeve, a connector inner conductor, a connector medium, a shell and a medium sheet, the sealing pad and the snap ring are installed between the shell and the sleeve to seal and fix the shell and the sleeve, the connector inner conductor is installed inside the shell, the connector medium is installed between the shell and the connector inner conductor to fix the shell and the connector inner conductor, the medium sheet is installed between the connector inner conductor and the shell to prevent the connector inner conductor from contacting the shell due to thermal expansion and contraction, and the connector inner conductor is connected with the cable inner conductor.

[0011] As a preferred scheme of the SMA type semi-flexible braided coaxial cable assembly with high heat conduction and no magnetism in extremely low temperature, in the utility model, the sealing pad is composed of red silicone rubber, and the snap ring is composed of beryllium bronze.

[0012] As a preferred scheme of the SMA type semi-flexible braided coaxial cable assembly with high heat conduction and no magnetism in extremely low temperature, in the utility model, the sleeve is composed of beryllium bronze, and the connector inner conductor is composed of beryllium bronze.

[0013] As a preferred scheme of the SMA type semi-flexible braided coaxial cable assembly with high heat conduction and no magnetism in extremely low temperature, in the utility model, the connector medium is composed of polytetrafluoroethylene, and the shell is composed of beryllium bronze.

[0014] As a preferred scheme of the SMA type semi-flexible braided coaxial cable assembly with high heat conduction and no magnetism in extremely low temperature, in the utility model, the cable inner conductor is composed of copper silver plating, and the cable medium layer is composed of polytetrafluoroethylene.

[0015] As a preferred scheme of the SMA type semi-flexible braided coaxial cable assembly with high heat conduction and no magnetism in extremely low temperature, in the utility model, the cable shielding layer is composed of copper silver plating, and the shell and the cable shielding layer are connected through welding.

[0016] The utility model discloses a cable unit, a connector unit and a SMA type semi-flexible braided coaxial cable assembly with high heat conduction and no magnetism in extremely low temperature.

[0017] Compared with the prior art microwave cable assembly, the beryllium bronze material used in the connector and the copper silver plating material used in the cable shielding layer can ensure the performance, quickly transfer and dissipate high-strength heat, have a compact structure, are easy to process and assemble, and can still realize complete signal transmission in an extremely low temperature and non-magnetic environment. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings. Among them:

[0019] Figure 1 It is a structural schematic diagram of the present application of a low-temperature-resistant high-thermal-conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly.

[0020] Figure 2 It is a structural schematic diagram of the connector unit in the present application of a low-temperature-resistant high-thermal-conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly.

[0021] Figure 3 It is a structural schematic diagram of the cable unit in the present application of a low-temperature-resistant high-thermal-conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly.

[0022] Figure 4 It is a test result of the present application of a low-temperature-resistant high-thermal-conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly in a normal temperature 300K environment.

[0023] Figure 5 It is a test result of the present application of a low-temperature-resistant high-thermal-conductivity non-magnetic SMA type semi-flexible braided coaxial cable assembly in a liquid nitrogen ultra-low temperature 77K environment.

[0024] BRIEF DESCRIPTION OF DRAWINGS: 100, cable unit; 101, cable inner conductor; 102, cable dielectric layer; 103, cable shielding layer; 200, connector unit; 201, gasket; 202, snap ring; 203, sleeve; 204, connector inner conductor; 205, connector dielectric; 206, housing; 207, dielectric sheet. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail in conjunction with the drawings of the specification.

[0026] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0027] Secondly, the "one embodiment" or "embodiments" referred to herein are intended to encompass a particular feature, structure, or characteristic in at least one implementation of the present application. The appearances of the "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a single, alternative embodiment, or a single, alternative implementation of the present application.

[0028] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0029] The coaxial cable has the advantages of wide frequency band, excellent electrical performance, bendable, convenient to use, etc. The radio frequency coaxial cable is composed of an inner conductor, a dielectric layer, an outer conductor and an outer sheath. The characteristic impedance of the radio frequency coaxial cable is:

[0030]

[0031] In the formula, a is the radius of the inner conductor of the radio frequency coaxial cable, b is the radius of the outer conductor of the radio frequency coaxial cable, The relative dielectric constant of the insulating medium between the conductors. As can be seen from the impedance formula, the change of each parameter will affect the characteristic impedance Z0 of the radio frequency coaxial cable.

[0032] Referring to Figure 1 - Figure 3 In one embodiment of the present application, a kind of SMA type semi-soft braided coaxial cable assembly of low temperature resistance high thermal conductivity non-magnetic is provided, comprising:

[0033] Cable unit 100, cable unit 100 includes cable inner conductor 101, cable dielectric layer 102 and cable shielding layer 103, cable inner conductor 101 is arranged inside cable dielectric layer 102, cable dielectric layer 102 is arranged inside cable shielding layer 103, cable dielectric layer 102 is used to fixedly support cable inner conductor 101 and cable shielding layer 103;

[0034] The connector unit 200 comprises a sealing gasket 201, a snap ring 202, a sleeve 203, a connector inner conductor 204, a connector medium 205, a shell 206 and a medium sheet 207, the sealing gasket 201 and the snap ring 202 are installed between the shell 206 and the sleeve 203 to seal and fix the shell 206 and the sleeve 203, the connector inner conductor 204 is installed inside the shell 206, the connector medium 205 is installed between the shell 206 and the connector inner conductor 204 to fix the shell 206 and the connector inner conductor 204, the medium sheet 207 is installed between the connector inner conductor 204 and the shell 206 to prevent the connector inner conductor 204 and the shell 206 from being in contact due to thermal expansion and contraction, so that the connector is short-circuited, and the connector inner conductor 204 is connected with the cable inner conductor 101.

[0035] The sealing gasket 201 is made of red silicone rubber, the snap ring 202 is made of beryllium bronze, the sleeve 203 is made of beryllium bronze, the connector inner conductor 204 is made of beryllium bronze, the connector medium 205 is made of polytetrafluoroethylene, the shell 206 is made of beryllium bronze, the cable inner conductor 101 is made of copper-plated silver, the cable medium layer 102 is made of polytetrafluoroethylene, the cable shielding layer 103 is made of copper-plated silver, and the shell 206 and the cable shielding layer 103 are connected through welding.

[0036] The beryllium bronze and the copper-plated silver material adopted in the application enable the cable to still have good performance in a super-low-temperature non-magnetic environment, and the heat generated by the cable unit 100 is conducted to the connector unit 200 through the cable shielding layer 103 and quickly dissipated. The overall structure of the assembly is very strong and reliable; the parts constituting the cable are simple, easy to assemble, test and mass produce, and the contents not described in detail in the description belong to the prior art known to those skilled in the art.

[0037] Reference Figure 4 , 5 Through comparison between normal temperature ( Figure 4 ) and extreme low temperature ( Figure 5 ), it is found that the assembly still has excellent performance indicators in a low-temperature environment, the return loss can reach below -20 dB at normal temperature; the return loss is below -20 dB at extreme low temperature 77K, and the indicators are still relatively good.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the application but not limit the application, although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the application, and all should be covered in the scope of the claims of the application.

Claims

1. A cryogenically resistant, high thermal conductivity, non-magnetic SMA type semi-flexible braided coaxial cable assembly characterized by, The utility model relates to a cable connector, which comprises: a cable unit (100) comprising a cable inner conductor (101), a cable medium layer (102) and a cable shielding layer (103), the cable inner conductor (101) being arranged inside the cable medium layer (102), the cable medium layer (102) being arranged inside the cable shielding layer (103), the cable medium layer (102) being used for fixing and supporting the cable inner conductor (101) and the cable shielding layer (103); a connector unit (200) comprising a sealing gasket (201), a snap ring (202), a screw sleeve (203), a connector inner conductor (204), a connector medium (205), a shell (206) and a medium sheet (207), the sealing gasket (201) and the snap ring (202) being arranged between the shell (206) and the screw sleeve (203) to seal and fix the shell (206) and the screw sleeve (203), the connector inner conductor (204) being arranged inside the shell (206), the connector medium (205) being arranged between the shell (206) and the connector inner conductor (204) to fix the shell (206) and the connector inner conductor (204), the medium sheet (207) being arranged between the connector inner conductor (204) and the shell (206) to prevent the connector inner conductor (204) from contacting the shell (206) due to thermal expansion and cold shrinkage, and the connector inner conductor (204) being connected with the cable inner conductor (101).

2. A low temperature resistant, high thermal conductivity, non-magnetic SMA type semi-flexible braided coaxial cable assembly according to claim 1, characterized in that: The sealing gasket (201) is made of red silicone rubber, and the snap ring (202) is made of beryllium bronze.

3. A low temperature resistant, high thermal conductivity, non-magnetic SMA type semi-flexible braided coaxial cable assembly according to claim 1, characterized in that: The screw sleeve (203) is made of beryllium bronze, and the connector inner conductor (204) is made of beryllium bronze.

4. A low temperature resistant, high thermal conductivity, non-magnetic SMA type semi-flexible braided coaxial cable assembly according to claim 1, characterized in that: The connector medium (205) is made of polytetrafluoroethylene, and the shell (206) is made of beryllium bronze.

5. A low temperature resistant, high thermal conductivity, non-magnetic SMA type semi-flexible braided coaxial cable assembly according to claim 1, characterized in that: The cable inner conductor (101) is made of copper-plated silver, and the cable medium layer (102) is made of polytetrafluoroethylene.

6. A low temperature resistant, high thermal conductivity, non-magnetic SMA type semi-flexible braided coaxial cable assembly according to claim 1, characterized in that: The cable shielding layer (103) is made of copper-plated silver, and the shell (206) and the cable shielding layer (103) are connected by welding.

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