Gas discharge tube

Abstract

The utility model relates to gas discharge tube technical field discloses a kind of gas discharge tube, including insulating tube and two electrodes, insulating tube is internally hollow pipe body structure;Two electrodes are oppositely arranged at the two ends of insulating tube, and are enclosed with insulating tube to form sealed cavity, and one end of each electrode towards another electrode is provided with discharge structure, and the facing side of two discharge structures has discharge surface, and two discharge surfaces are spaced and arranged in parallel, and discharge gap is enclosed between two discharge surfaces, and discharge surface includes at least two connection surfaces arranged in intersection. The utility model increases the effective discharge area of electrode, and improves the current-carrying capacity of gas discharge tube.

Description

Technical Field

[0001] This utility model relates to the field of gas discharge tube technology, and in particular to a gas discharge tube. Background Technology

[0002] Currently, the Gas Discharge Tube (GDT) is a voltage-limiting electronic component. Its main structure includes a ceramic tube and upper and lower electrodes at both ends of the tube. A discharge gap is formed between the upper and lower electrodes and filled with a specific inert gas. When the voltage applied across the gas discharge tube exceeds its breakdown threshold, the gas discharge tube breaks down, conducts, and releases current to protect the circuit connected in parallel with it.

[0003] In traditional gas discharge tube structures, the upper and lower electrodes typically have discharge plane structures parallel to the cross-section of the gas discharge tube, and the current-carrying discharge function can be achieved through the two opposing discharge plane structures. However, when the overall size of the gas discharge tube is limited by space, the effective area of ​​the electrode discharge cross-section is small, which restricts the current-carrying capacity of the gas discharge tube. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a gas discharge tube that improves the flow capacity of the gas discharge tube.

[0005] To achieve the above objectives, this utility model provides a gas discharge tube, comprising:

[0006] An insulating tube, the insulating tube having an internally hollow tube structure; and

[0007] Two electrodes are disposed at opposite ends of the insulating tube and enclosed with the insulating tube to form a sealed cavity. Each electrode has a discharge structure at one end facing the other electrode. The two discharge structures have a discharge surface on their opposite sides. The two discharge surfaces are spaced apart and arranged in parallel, and a discharge gap is formed between the two discharge surfaces. The discharge surface includes at least two intersecting connecting surfaces.

[0008] In one embodiment, the discharge structure is arranged in a stepped shape, including a plurality of stepped units connected in sequence, wherein each stepped unit includes a platform and a side surface;

[0009] Each pair of adjacent platforms is staggered in the axial direction of the insulating tube, and each pair of adjacent platforms is connected by the side surface, with both the platform and the side surface defining the connecting surface.

[0010] In one embodiment, the platform is arranged parallel to the cross-section of the insulating tube, and the side surface is arranged perpendicular to the cross-section of the insulating tube.

[0011] In one embodiment, a plurality of the step units are arranged sequentially along a straight line.

[0012] In one embodiment, the discharge gaps are equidistant.

[0013] In one embodiment, the discharge surfaces of both electrodes are coated with a cathode discharge material.

[0014] In one embodiment, the inner wall of the insulating tube is provided with carbon wire, which is located on the periphery of the discharge structure and extends along the axial direction of the insulating tube.

[0015] In one embodiment, each electrode has a connecting structure at one end facing away from the other electrode. The connecting structure is plate-shaped and its periphery is fixedly connected to the outer end of the insulating tube.

[0016] In one embodiment, the electrode further includes a guide structure connected between the connection structure and the discharge structure. The guide structure is cone-shaped, and its cross-sectional area gradually decreases from the connection structure toward the discharge structure.

[0017] In one embodiment, the end of the connection structure facing away from the discharge structure is provided with a groove.

[0018] This utility model provides a gas discharge tube, which has the following advantages compared with the prior art:

[0019] In this embodiment of the invention, the gas discharge tube has two electrodes facing each other with discharge structures. Each of the two discharge structures has a discharge surface on its facing side. The two discharge surfaces are spaced apart and arranged in parallel to form a discharge gap for absorbing the energy of the current-carrying discharge. Specifically, this invention includes at least two intersecting connecting surfaces on the discharge surface of the discharge structure. At least a portion of the connecting surface can be angled to the cross-section of the insulating tube, allowing lateral discharge through the discharge gap formed by these connecting surfaces. This effectively increases the total area of ​​the relative discharge surfaces between the two discharge structures, thereby improving the current-carrying capacity of the gas discharge tube. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the gas discharge tube described in an embodiment of the present invention;

[0021] Figure 2 This is a front view of the gas discharge tube described in this embodiment of the utility model;

[0022] Figure 3 This is a utility model Figure 2 Cross-sectional view of the gas discharge tube;

[0023] Figure 4 This is a schematic diagram of the electrode structure according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic projection of the discharge area of ​​the gas discharge tube according to an embodiment of the present invention.

[0025] In the figure, 100 is the gas discharge tube; 100a is the sealed cavity; 10 is the insulating tube; 20 is the electrode; 20a is the discharge gap; 201a is the first discharge region; 202a is the second discharge region; 21 is the discharge structure; 211 is the stepped unit; 211a is the platform; 211b is the side; 22 is the connecting structure; 221 is the groove; 23 is the guiding structure; and 30 is the carbon wire. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] It should be understood that the terms "before" and "after" are used in this utility model to describe various types of information, but these terms should not be limited to them. These terms are only used to distinguish information of the same type from each other. For example, "before" information can also be called "after" information, and "after" information can also be called "before" information, without departing from the scope of this utility model.

[0028] like Figures 1 to 3 As shown, a gas discharge tube according to an embodiment of the present invention includes an insulating tube 10 and two electrodes 20. The insulating tube 10 has a hollow tube structure. The two electrodes 20 are respectively disposed at opposite ends of the insulating tube 10 and form a sealed cavity with the insulating tube 10. Each electrode 20 has a discharge structure 21 at one end facing the other electrode 20. The two discharge structures 21 have a discharge surface on their opposite sides. The two discharge surfaces are spaced apart and arranged in parallel, and a discharge gap 20a is formed between the two discharge surfaces. The discharge surface includes at least two intersecting connecting surfaces.

[0029] In this embodiment, the insulating tube 10 is hollow inside. Two electrodes 20 are arranged opposite each other along the axial direction of the insulating tube 10 and respectively cover both ends of the insulating tube 10, sealing them together. This allows the gas discharge tube to form a sealed cavity through the two electrodes 20 and the insulating tube 10, which can be filled with an inert gas with stable electrical properties. Discharge structures 21 are also provided at both ends of the two electrodes 20, extending into the insulating tube 10, and their shapes are compatible. The two discharge structures 21 are spaced apart and arranged parallel within the sealed cavity, and the facing surfaces of the two discharge structures 21 have relatively spaced discharge surfaces that can be enclosed to form a discharge gap 20a.

[0030] Furthermore, the discharge surface includes at least two intersecting connecting surfaces, and the connecting surfaces of the two discharge surfaces are spaced apart and arranged in parallel. With this arrangement, compared to conventional gas discharge tubes that can only achieve discharge function through their cross-section, this invention increases the flexibility of the discharge surface arrangement of the discharge structure 21, and by making the connecting surfaces form an angle with the cross-section of the insulating tube 10, the total area of ​​the discharge surface can be increased, thereby improving the flow capacity of the gas discharge tube.

[0031] Among them, at least part of the discharge gap 20a of the two discharge structures 21 is set at an angle to the cross-section of the insulating tube 10, while the extension direction of the remaining discharge gap 20a can be set parallel to the cross-section of the insulating tube 10.

[0032] Specifically, when a portion of the connecting surface of the two discharge structures 21 is configured to form an angle with the cross-section of the insulating tube 10, a discharge gap 20a can be formed by enclosing this portion of the connecting surface, with its extending direction forming an angle with the cross-section of the insulating tube 10. Through this structural design, the two electrodes 20 can achieve lateral discharge at this portion of the discharge gap 20a.

[0033] Optionally, in some embodiments, the discharge gap 20a may be perpendicular to the cross-section of the insulating tube 10. Of course, in other embodiments, the discharge gap 20a for side discharge 211b may also be configured to be inclined to the cross-section of the insulating tube 10, for example, such that the angle between its extension direction and the cross-section of the insulating tube 10 is acute or obtuse.

[0034] The insulating tube 10 can be a ceramic tube to provide good insulation, high temperature resistance, and low production cost. Both electrodes 20 can be made of a metallic material such as copper to ensure good conductivity and ease of implementation. The inert gas can be argon, neon, or similar gases. Specific implementation methods can be customized according to actual needs and are not limited here.

[0035] like Figures 3 to 5As shown, the discharge structure 21 of this utility model embodiment is arranged in a stepped shape, including a plurality of stepped units 211 connected in sequence. Each stepped unit 211 includes a platform 211a and a side surface 211b. Each pair of adjacent platforms 211a are staggered in the axial direction of the insulating tube 10, and each pair of adjacent platforms 211a are connected by the side surface 211b. Both the platform 211a and the side surface 211b define a connecting surface.

[0036] In this design, the platform surfaces 211a of the stepped units 211 of the two discharge structures 21 are arranged opposite each other in pairs to form the first discharge region 201a of the discharge gap 20a; similarly, the side surfaces 211b of the stepped units 211 of the two discharge structures 21 are also arranged opposite each other in pairs to form the second discharge region 202a of the discharge gap 20a. Since each pair of adjacent platform surfaces 211a of the same discharge structure 21 is staggered in the axial direction of the insulating tube 10, the side surfaces 211b connecting the adjacent platform surfaces 211a can be arranged at an angle to the cross-section of the insulating tube 10. Thus, discharge can be achieved on the side surfaces 211b in the second discharge region 202a of the discharge gap 20a.

[0037] Optionally, such as Figure 3 As shown, in this embodiment of the present invention, the tabletop 211a is arranged parallel to the cross-section of the insulating tube 10, and the side surface 211b is arranged perpendicular to the cross-section of the insulating tube 10.

[0038] With this configuration, the extension direction of the first discharge region 201a of the discharge gap 20a is parallel to the cross-sectional direction of the insulating tube 10. Thus, the cross-sectional discharge function of a conventional gas discharge tube can be achieved through the first discharge region 201a. Furthermore, based on the cross-sectional discharge, the side 211b discharge can also be achieved through the second discharge region 202a, thereby effectively increasing the total area of ​​the discharge surface of the electrode 20.

[0039] Specifically, in this embodiment, the discharge structure 21 includes two stepped units 211 connected in sequence. Thus, the discharge gap 20a formed by the two discharge structures 21 includes a first discharge region 201a, a second discharge region 202a, and a third discharge region 201a connected in sequence. The projection of each discharge region onto the cross-section of the insulating tube 10 is as follows: Figure 5 As shown.

[0040] like Figure 3 and Figure 4 As shown, several step units 211 of this utility model embodiment are arranged sequentially along a straight line.

[0041] In this embodiment, by arranging a plurality of stepped units 211 of the same discharge structure 21 sequentially along a straight line, the discharge structure 21 can be made to have an easily achievable straight stepped shape. The height of the plurality of stepped units 211 of the same discharge structure 21 can be progressively increased or decreased; the height of the plurality of stepped units 211 of the same discharge structure 21 can also be convex (higher in the middle and lower at both ends) or concave (lower in the middle and higher at both ends).

[0042] Of course, the technical solution of this utility model is not limited to this. In other embodiments, the subsequent step unit 211 of the same discharge structure 21 can be configured to surround the periphery of the previous step unit 211, and the height of several step units 211 can be set to increase or decrease step by step. The specific implementation can be set according to actual needs and is not limited here.

[0043] like Figure 3 As shown, the discharge gaps 20a in this embodiment of the present invention are equidistant, which helps to ensure the stability and reliability of the gas discharge tube operation.

[0044] Optionally, in some embodiments, the discharge surfaces of both discharge structures 21 of this invention are coated with a cathode discharge material. The cathode discharge material can be specifically configured as an oxide of an active metal such as sodium, magnesium, or aluminum. With this configuration, this invention can discharge through the cathode discharge material-assisted electrode 20, thereby facilitating a faster response of the gas discharge tube.

[0045] like Figure 3 As shown, the inner wall of the insulating tube 10 in this embodiment of the present invention is provided with carbon wire 30, which is located on the periphery of the discharge structure 21 and extends along the axial direction of the insulating tube 10.

[0046] In this embodiment, the carbon wire 30 is a strip-shaped structure extending along the axial direction of the insulating tube 10, and there are several of them. The carbon wires 30 are spaced apart in the circumferential direction of the insulating tube 10. Optionally, the carbon wire 30 can be centrally located on the inner wall of the insulating tube 10 and adjacent to the discharge gap 20a formed by the discharge structure 21 of the two electrodes 20; the two ends of the carbon wire 30 are spaced apart from the two electrodes 20 at both ends of the insulating tube 10 to avoid the two electrodes 20 from being interconnected through the carbon wire 30.

[0047] It should be noted that, in other embodiments, the carbon wire 30 may also be configured as an annular structure surrounding the insulating tube 10 in the circumferential direction, with a plurality of carbon wires 30 spaced apart in the axial direction of the insulating tube 10. Specific implementation methods can be customized according to actual needs and are not limited here.

[0048] It is understood that by providing carbon wires 30 on the inner wall of the insulating tube 10, this utility model helps to reduce the pulse breakdown voltage and achieve a faster operating response. Furthermore, by providing a plurality of carbon wires 30, the remaining carbon wires 30 can continue to reduce the pulse breakdown voltage even if a single carbon wire 30 fails, thereby helping to ensure the working stability of the gas discharge tube.

[0049] like Figure 3 and Figure 4 As shown, in this embodiment of the present invention, each electrode 20 is provided with a connecting structure 22 at one end away from the other electrode 20. The connecting structure 22 is arranged in a flat plate shape, and the periphery of the connecting structure 22 is fixedly connected to the outer end of the insulating tube 10.

[0050] In this embodiment, the periphery of the connecting structure 22 can be specifically welded to the outer end face of the insulating tube 10 by metal solder. This arrangement helps to ensure the connection strength between the insulating tube 10 and its two end electrodes 20, and to ensure the sealing performance of the sealing cavity of the gas discharge tube.

[0051] like Figure 3 and Figure 4 As shown, electrode 20 also includes a guide structure 23 connected between connection structure 22 and discharge structure 21. The guide structure 23 is arranged in a cone shape, and the cross-sectional area of ​​the guide structure 23 gradually decreases from connection structure 22 toward discharge structure 21.

[0052] With this configuration, during the assembly of electrode 20 and insulating tube 10, the guide structure 23 can act as a guide, allowing electrode 20 to be quickly assembled to the end of insulating tube 10, thereby improving the ease of assembly of the gas discharge tube. Furthermore, the guide structure 23 can also limit the position of electrode 20, helping to ensure the assembly accuracy of the gas discharge tube.

[0053] like Figure 1 and Figure 3 As shown, the end of the connecting structure 22 facing away from the discharge structure 21 has a groove 221. This design facilitates the soldering process on the electrode 20, which improves the ease of assembly of the gas discharge tube.

[0054] The working process of this invention is as follows: Under normal operating voltage, the sealed cavity of the gas discharge tube is filled with inert gas, making the gas discharge tube in a high-resistance state during normal operation, with almost no current flowing through it, allowing the parallel circuit to function normally. When an abnormal high voltage occurs due to lightning strikes or overvoltage conditions, the voltage applied across the gas discharge tube exceeds its breakdown threshold. At this time, the gas discharge tube can break down and conduct, releasing current to protect the circuit connected in parallel from damage. When the abnormal high voltage disappears, the voltage applied across the gas discharge tube falls below its breakdown threshold, and the gas discharge tube shell automatically returns to a high-resistance state, enabling the gas discharge tube to achieve automatic recovery and multiple-use overvoltage protection.

[0055] In summary, this utility model provides a gas discharge tube, which includes an insulating tube 10 and electrodes 20 disposed at both ends of the insulating tube 10. Each electrode 20 has a discharge structure 21 at one end facing the other electrode 20, and the two discharge structures 21 have a discharge surface on their facing sides. The two discharge surfaces are spaced apart and arranged in parallel, forming a discharge gap 20a between the two discharge surfaces for absorbing the energy of the current discharge. Specifically, this utility model includes at least two intersecting connecting surfaces on the discharge surface of the discharge structure 21, allowing at least a portion of the connecting surfaces to be angled to the cross-section of the insulating tube 10. This enables lateral discharge through the discharge gap 20a formed by these connecting surfaces, effectively increasing the total area of ​​the relative discharge surfaces between the two discharge structures 21.

[0056] With this configuration, under the same size and specifications, the total area of ​​the discharge surface of the gas discharge tube of this invention can be increased by 30% or more, giving the gas discharge tube a stronger flow capacity. Under the same flow capacity requirements, the gas discharge tube of this invention can reduce its size and specifications to a certain extent to achieve miniaturization. Thus, the gas discharge tube of this invention can simultaneously meet the stringent requirements of both size and flow capacity in various application scenarios, resulting in better practicality.

[0057] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A gas discharge tube, characterized in that, include: An insulating tube, wherein the insulating tube has an internally hollow tube structure; and Two electrodes are disposed at opposite ends of the insulating tube and enclosed with the insulating tube to form a sealed cavity. Each electrode has a discharge structure at one end facing the other electrode. The two discharge structures have a discharge surface on their opposite sides. The two discharge surfaces are spaced apart and arranged in parallel, and a discharge gap is formed between the two discharge surfaces. The discharge surface includes at least two intersecting connecting surfaces.

2. The gas discharge tube according to claim 1, characterized in that, The discharge structure is arranged in a stepped shape, including a number of stepped units connected in sequence, and each stepped unit includes a platform and a side. Each pair of adjacent platforms is staggered in the axial direction of the insulating tube, and each pair of adjacent platforms is connected by the side surface, with both the platform and the side surface defining the connecting surface.

3. The gas discharge tube according to claim 2, characterized in that, The platform is arranged parallel to the cross-section of the insulating tube, and the side is arranged perpendicular to the cross-section of the insulating tube.

4. The gas discharge tube according to claim 2, characterized in that, Several of the aforementioned step units are arranged sequentially along a straight line.

5. The gas discharge tube according to claim 1, characterized in that, The discharge gaps are equidistant.

6. The gas discharge tube according to any one of claims 1 to 5, characterized in that, Both discharge structures have their discharge surfaces coated with cathode discharge material.

7. The gas discharge tube according to any one of claims 1 to 5, characterized in that, The inner wall of the insulating tube is provided with carbon wires, which are located on the periphery of the discharge structure and extend along the axial direction of the insulating tube.

8. The gas discharge tube according to any one of claims 1 to 5, characterized in that, Each electrode has a connecting structure at one end away from the other electrode. The connecting structure is flat and its periphery is fixedly connected to the outer end of the insulating tube.

9. The gas discharge tube according to claim 8, characterized in that, The electrode further includes a guide structure connecting the connection structure and the discharge structure. The guide structure is cone-shaped, and its cross-sectional area gradually decreases from the connection structure toward the discharge structure.

10. The gas discharge tube according to claim 8, characterized in that, The connection structure has a groove at the end opposite to the discharge structure.

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