Thermal expansion prevention gas switch

Abstract

The utility model provides an anti-thermal-expansion gas switch, which comprises a copper pipe and a ceramic pipe arranged on the inner wall of the copper pipe. The number of the metal support assemblies is two, the two metal support assemblies are symmetrically arranged on the inner wall of the ceramic tube up and down, and a discharge area is formed between the two metal support assemblies and the ceramic tube; the number of the electrodes is two, and the two electrodes are arranged on the two metal support assemblies respectively and are symmetrical to each other, so that the discharge ends of the two electrodes are both located in a discharge area; each metal support assembly is provided with an expansion joint extending from the surface to the interior and used for extruding the expansion joint to absorb expansion force when the metal support assembly is heated to expand. Through the preset expansion joint, it is guaranteed that the metal support assembly does not generate radial deformation when heated, and the ceramic tube is not damaged by radial extrusion.

Description

Technical Field

[0001] The utility model relates to the field of pulse switches, in particular to a gas switch that is resistant to thermal expansion. Background Art

[0002] Gas switches are usually used in high-voltage pulse discharge devices in water. In essence, they are actually a group of electrodes. When high voltage electricity is applied to both ends of the electrodes, when the voltage reaches a certain level, the gas medium between the electrodes is broken down to form conduction. At this time, the high voltage electricity is applied to the next group of working electrodes through the arc, allowing the working electrodes to work normally. When the gas switch does not break down, the working electrode does not discharge, and it plays the function and role of a switch.

[0003] Due to insulation requirements in gas switches, electrodes and metal connectors are fixed in insulating materials (such as ceramics). When the gas switch is working normally, the gas medium is constantly broken down, resulting in continuous switching actions. During this period, the arc is pulled out and a large amount of heat is generated. The metal connectors that fix the electrodes are generally bonded to the ceramic tube with heat-resistant glue; due to the different thermal expansion coefficients of the ceramic tube and the metal connectors, the metal connectors expand relatively large. After a long period of continuous discharge, the temperature will quickly rise to 300-400 degrees Celsius. The expansion of the metal connectors will squeeze the ceramic tube and affect the normal operation of the gas switch. At the same time, when the gas switch is working, the continuous discharge state will continuously ablate the electrode material, generating a lot of tiny metal powder in the middle of the electrode. Since the metal powder is conductive, it changes the dielectric properties of the medium in the gas switch, which will also affect the normal operation of the gas switch.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The utility model provides a gas switch capable of preventing thermal expansion, so as to solve the technical problem that a ceramic tube is squeezed and cracked.

[0006] A gas switch for preventing thermal expansion, comprising a copper tube, and

[0007] A ceramic tube, wherein the ceramic tube is arranged on the inner wall of the copper tube;

[0008] A metal bracket assembly, wherein two metal bracket assemblies are provided, and the two metal bracket assemblies are symmetrically arranged one above and one below on the inner wall of the ceramic tube, and a discharge zone is formed between the two metal bracket assemblies and the ceramic tube;

[0009] Electrode, two electrodes are provided, and the two electrodes are respectively arranged on the two metal bracket components and are symmetrical to each other, so that the discharge ends of the two electrodes are both located in the discharge area;

[0010] A heat sink is arranged on the metal bracket assembly and is used for heat dissipation of the metal bracket assembly.

[0011] Preferably, the metal bracket assembly comprises a sleeve and a connecting plate, a plurality of connecting plates are provided, and a circular array is arranged on the side of the sleeve, and each connecting plate is provided with the heat sink;

[0012] The electrode is arranged on the sleeve, and the heat sink faces a direction away from the discharge region.

[0013] Preferably, a gap is left between two adjacent heat sinks.

[0014] Preferably, each of the heat sinks is adhered to the inner wall of the ceramic tube by means of high temperature resistant adhesive.

[0015] Preferably, the portion of the electrode outside the discharge zone is provided with threads, the inner wall of the sleeve is provided with threads, the electrode is threadedly connected in the threaded hole, and a locking nut abutting against the metal bracket assembly is threadedly connected to the electrode.

[0016] In summary, compared with the existing technology:

[0017] 1. The pre-set gap ensures that the metal bracket assembly does not produce radial deformation when heated, so that the ceramic tube is not damaged by radial extrusion, thereby extending the working time of the gas switch and ensuring the normal operation of the power pulse device;

[0018] 2. Use the self-generated electric field to adsorb and ablate electrode powder to ensure the normal working state of the gas switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A cross-sectional view provided in one embodiment of the utility model;

[0021] Figure 2 A top view provided in one embodiment of the utility model;

[0022] Figure 3 It is a three-dimensional schematic diagram of a metal bracket assembly provided in one embodiment of the present utility model.

[0023] In the above drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Copper tube; 2. Ceramic tube; 3. Metal bracket assembly; 3-1. Casing; 3-2. Connecting plate; 4. Electrode; 5. High temperature resistant glue; 6. Locking nut; 7. Heat sink; 8. Gap. DETAILED DESCRIPTION

[0025] In order to make the above and other features and advantages of the utility model more clear, the utility model is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] The utility model discloses a gas switch for preventing thermal expansion, comprising a copper tube 1 and a ceramic tube 2, wherein the ceramic tube 2 is arranged on the inner wall of the copper tube 1; a metal bracket component 3, wherein two metal bracket components 3 are provided, and the two metal bracket components 3 are symmetrically arranged on the inner wall of the ceramic tube 2 one above and one below, and a discharge zone is formed between the two metal bracket components 3 and the ceramic tube 2; an electrode 4, wherein two electrodes 4 are provided, and the two electrodes 4 are respectively arranged on the two metal bracket components 3 and are symmetrical to each other, so that the discharge ends of the two electrodes 4 are both located in the discharge zone; and a heat sink 7, wherein the heat sink 7 is provided on the metal bracket component 3 and is used for heat dissipation of the metal bracket component 3.

[0031] On the basis of the above embodiments, some other embodiments of the present application may be further increased or limited by one or more of the following combinations on the basis of the above specific embodiments.

[0032] The metal support assembly 3 includes a sleeve 3-1 and a connecting plate 3-2. There are multiple connecting plates 3-2, and a circular array is arranged on the side of the sleeve 3-1. Each connecting plate 3-2 is provided with the heat sink 7; the electrode 4 is arranged on the sleeve 3-1, and the heat sink 7 faces the direction away from the discharge area.

[0033] A gap 8 is left between two adjacent heat sinks 7 .

[0034] Each heat sink 7 is adhered to the inner wall of the ceramic tube 2 by means of a high temperature resistant adhesive 5 .

[0035] The portion of the electrode 4 outside the discharge zone is provided with threads, the inner wall of the sleeve 3 - 1 is provided with threads, the electrode 4 is threadedly connected in the threaded hole, and a locking nut 6 abutting against the metal bracket assembly 3 is threadedly connected to the electrode 4 .

[0036] In summary, when the gas switch is working, continuous discharge pulses pull out an arc and generate a large amount of heat. The heat is conducted to the ceramic tube through the heat sink 7 on the metal bracket assembly 3. The sleeve 3-1 on the metal bracket assembly 3 expands due to the heat, and the expansion force is transmitted to the heat sink 7 through the connecting plate 3-2, and then absorbed by the gap 8 between the heat sink 7, so that it does not expand in the radial direction, ensuring that the ceramic tube is not squeezed and cracked.

[0037] At the same time, when the gas switch is working normally, the continuous discharge pulses generated will induce a certain voltage on the copper tube 1. This voltage generates an electric field in the gas medium. Under the action of this electric field, the metal powder of the electrode 4 material that is ablated is adsorbed to the inner wall of the ceramic tube 2. In this way, the dielectric parameters of the gas medium in the gas switch will not change greatly, thereby ensuring the normal operation of the gas switch.

[0038] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gas switch for preventing thermal expansion, characterized in that: Including copper pipes, and A ceramic tube, wherein the ceramic tube is arranged on the inner wall of the copper tube; A metal support assembly, wherein two groups of the metal support assemblies are provided, and the two groups of the metal support assemblies are symmetrically arranged one above and one below on the inner wall of the ceramic tube, and a discharge zone is formed between the two metal support assemblies and the ceramic tube; Electrode, two electrodes are provided, and the two electrodes are respectively arranged on the two metal bracket components and are symmetrical to each other, so that the discharge ends of the two electrodes are both located in the discharge area; A heat sink is arranged on the metal bracket assembly and is used for heat dissipation of the metal bracket assembly.

2. The gas switch for preventing thermal expansion according to claim 1, characterized in that: The metal bracket assembly includes a sleeve and a connecting plate, wherein a plurality of connecting plates are provided and a circular array is arranged on the side of the sleeve, and each connecting plate is provided with the heat sink; The electrode is arranged on the sleeve, and the heat sink faces a direction away from the discharge region.

3. The gas switch for preventing thermal expansion according to claim 2, characterized in that: A gap is left between two adjacent heat sinks.

4. The gas switch for preventing thermal expansion according to claim 2, characterized in that: Each of the heat sinks is adhered to the inner wall of the ceramic tube by means of high temperature resistant adhesive.

5. The gas switch for preventing thermal expansion according to claim 2, characterized in that: The portion of the electrode outside the discharge zone is provided with threads, the inner wall of the sleeve is provided with threads, the electrode is threadedly connected in the threaded hole, and a locking nut abutting against the metal bracket assembly is threadedly connected on the electrode.

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