Gas discharge tube

Abstract

The gas discharge tube comprises an insulating tube, a bulge, an upper end electrode and a lower end electrode, the upper-end electrode and the lower-end electrode are respectively arranged at the openings at the two ends of the insulating tube in a sealing manner; protrusions are arranged on the inner side wall of the insulating tube, and the protrusions are annular protrusions distributed along the inner side wall of the insulating tube. Compared with a traditional discharge tube, the inner wall of the ceramic tube protrudes, insulation reduction caused by the fact that electronic powder is sputtered to the tube wall is avoided, and internal insulation is increased through the protruding period of the inner wall of the ceramic tube. The carbon lines drawn on the inner wall of the ceramic tube can reduce pulse breakdown voltage and residual voltage. According to a traditional smooth inner wall painting carbon line, insulation is reduced due to conduction between two electrodes due to the fact that a carbon pen is thick, the discharge tube only needs to draw the carbon line at the protruding position, the two electrodes cannot be conducted, and the risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of discharge tubes, and particularly relates to a gas discharge tube. Background Art

[0002] Gas discharge tubes are often used in the first or first two stages of a multi-stage protection circuit to discharge lightning instantaneous overcurrent and limit overvoltage. The packaging shell material is mostly ceramic, so it is also called a ceramic discharge tube. This type of discharge tube has the advantages of small size and large current capacity, but it also has disadvantages such as poor product consistency and high residual voltage. It is an important lightning protection component with a wide range of applications. When selecting and using it, it is necessary to fully understand its performance parameters and precautions for use to ensure that it can effectively protect circuits and equipment from the harm of lightning.

[0003] The traditional smooth inner wall carbon line is easy to cause conduction between the two electrodes due to the thick carbon pencil, which reduces the insulation. At the same time, the size of the insulating tube is limited by the structure, the distance between the inner wall is small, and the current carrying capacity is relatively weak. Utility Model Content

[0004] The purpose of the utility model is to provide a gas discharge tube to solve the above problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A gas discharge tube comprises an insulating tube, a protrusion, an upper electrode and a lower electrode; the two ends of the insulating tube are open, and the upper electrode and the lower electrode are respectively sealed and arranged at the openings at the two ends of the insulating tube; the inner wall of the insulating tube is provided with a protrusion, and the protrusion is an annular protrusion distributed along the inner wall of the insulating tube.

[0007] Furthermore, a plurality of carbon wires are arranged at equal intervals on the annular protrusion.

[0008] Furthermore, the carbon wire is arranged along the axial direction of the insulating tube, and the length of the carbon wire is equal to the width of the protrusion.

[0009] Furthermore, the number of carbon threads is 4-8.

[0010] Furthermore, a first electrode boss and a second electrode boss are arranged on the inner side of the upper electrode. The first electrode boss is arranged on the lower surface of the upper electrode, and the second electrode boss is arranged on the lower surface of the first electrode boss.

[0011] Furthermore, the upper electrode and the lower electrode have the same structure and are relatively mounted on the insulating tube.

[0012] Furthermore, an upper emitting surface and a lower emitting surface are respectively provided on the first electrode bosses of the upper electrode and the lower electrode.

[0013] Furthermore, the upper emitting surface and the lower emitting surface are both in a grid shape.

[0014] Furthermore, the insulating tube is a ceramic tube.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] Compared with the traditional discharge tube, the utility model has a bulge on the inner wall of the ceramic tube, thereby avoiding the reduction of insulation caused by the sputtering of electron powder to the tube wall, and increasing the internal insulation through the bulge of the inner wall of the ceramic tube.

[0017] The carbon lines painted on the inner wall of the ceramic tube can reduce the pulse breakdown voltage and residual pressure. The traditional smooth inner wall carbon lines are easy to cause conduction between the two electrodes and reduce insulation due to the thick carbon pencil. The discharge tube only needs to draw carbon lines on the raised areas to avoid conduction between the two electrodes, reducing the above risks.

[0018] When the discharge tube is welded, the metallized metal will be laminarized and adhere to the inner wall of the ceramic tube, reducing the internal insulation. The discharge tube has a larger current capacity due to the increased distance from the inner wall of the protrusion and the increased strength of the ceramic due to the protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Figure 2 This is an axonometric drawing of the utility model.

[0021] Figure 3 It is a cross-sectional view of the utility model.

[0022] in:

[0023] 1 upper electrode, 2 insulating tube, 3 protrusion, 4 lower electrode, 5 carbon wire, 6 upper emission surface, 7 lower emission surface, 8 first electrode protrusion, 9 second electrode protrusion. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1 The utility model provides a gas discharge tube, comprising an insulating tube 2, a protrusion 3, an upper electrode 1 and a lower electrode 4; both ends of the insulating tube 2 are open, and the upper electrode 1 and the lower electrode 4 are respectively sealed and arranged at the openings at both ends of the insulating tube 2; the inner wall of the insulating tube 2 is provided with a protrusion 3, and the protrusion 3 is an annular protrusion distributed along the inner wall of the insulating tube 2. A plurality of carbon wires 5 are arranged at equal intervals on the annular protrusion.

[0028] Compared with the traditional discharge tube, the utility model has a bulge on the inner wall of the ceramic tube, thereby avoiding the reduction of insulation caused by the sputtering of electron powder to the tube wall, and increasing the internal insulation through the bulge of the inner wall of the ceramic tube.

[0029] The carbon lines painted on the inner wall of the ceramic tube can reduce the pulse breakdown voltage and residual pressure. The traditional smooth inner wall carbon lines are easy to cause conduction between the two electrodes and reduce insulation due to the thick carbon pencil. The discharge tube only needs to draw carbon lines on the raised areas to avoid conduction between the two electrodes, reducing the above risks.

[0030] The carbon wire 5 is arranged along the axial direction of the insulating tube 2 , and the length of the carbon wire 5 is equal to the width of the protrusion 3 .

[0031] The number of carbon wires 5 is 4 to 8. The embodiment of the utility model uses 4 carbon wires, which are distributed on the annular protrusion at 90 degrees to each other.

[0032] A first electrode boss 8 and a second electrode boss 9 are arranged inside the upper electrode 1. The first electrode boss 8 is arranged on the lower surface of the upper electrode 1, and the second electrode boss 9 is arranged on the lower surface of the first electrode boss 8. The electrodes at both ends are made of metal materials, such as copper, copper alloy and other metal materials, which have good conductivity and are easy to implement.

[0033] The upper electrode 1 and the lower electrode 4 have the same structure and are mounted on the insulating tube 2 relative to each other.

[0034] An upper emitting surface 6 and a lower emitting surface 7 are respectively provided on the first electrode bosses 8 of the upper electrode 1 and the lower electrode 4 .

[0035] The upper emitting surface 6 and the lower emitting surface 7 are both in a grid shape.

[0036] The insulating tube 2 is a ceramic tube. The insulating tube is realized by using a ceramic tube, which has good insulation performance, high temperature resistance, good stability, is easy to realize, and has low cost.

[0037] Working principle:

[0038] Under normal operating voltage, the gas inside the gas discharge tube is insulated, and almost no current will pass through. At this time, the gas discharge tube has almost no effect on the circuit. When the circuit is damaged by lightning, the voltage suddenly rises, and when it exceeds the breakdown voltage of the gas discharge tube, the gas molecules in the tube begin to ionize, generating a large number of free electrons and positive ions. These charge carriers move under the action of the electric field, rapidly increasing the flow of current, causing the gas discharge tube to quickly change to a low resistance state. Once the discharge begins, the plasma formed inside the gas discharge tube can conduct electricity, so that the excessive voltage is released through the gas discharge tube, thereby protecting other components in the circuit from damage. During the discharge process, the resistance value of the gas discharge tube is extremely low, and the overvoltage can be quickly derived. When the voltage in the circuit drops to a safe range, the ionization state in the gas discharge tube will disappear quickly, the plasma will cool, and the gas discharge tube will return to a high resistance state, which will again play a role in insulating protection of the circuit. The advantage of this application is the air gap formed by the boss, which increases creepage. With this gap, sputtering onto the boss does not affect insulation, and the gap will not be sputtered after being blocked by the boss.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A gas discharge tube, characterized in that: The insulating tube (2) comprises an insulating tube (2), a protrusion (3), an upper electrode (1) and a lower electrode (4); both ends of the insulating tube (2) are open, and the upper electrode (1) and the lower electrode (4) are respectively sealed and arranged at the openings at both ends of the insulating tube (2); the inner wall of the insulating tube (2) is provided with a protrusion (3), and the protrusion (3) is an annular protrusion distributed along the inner wall of the insulating tube (2).

2. A gas discharge tube according to claim 1, characterized in that: A plurality of carbon wires (5) are arranged at equal intervals on the annular protrusion.

3. A gas discharge tube according to claim 2, characterized in that: The carbon wire (5) is arranged along the axial direction of the insulating tube (2), and the length of the carbon wire (5) is equal to the width of the protrusion (3).

4. A gas discharge tube according to claim 2, characterized in that: The number of carbon wires (5) is 4-8.

5. A gas discharge tube according to claim 1, characterized in that: A first electrode boss (8) and a second electrode boss (9) are arranged on the inner side of the upper electrode (1); the first electrode boss (8) is arranged on the lower surface of the upper electrode (1); and the second electrode boss (9) is arranged on the lower surface of the first electrode boss (8).

6. A gas discharge tube according to claim 5, characterized in that: The upper electrode (1) and the lower electrode (4) have the same structure and are relatively mounted on the insulating tube (2).

7. A gas discharge tube according to claim 6, characterized in that: An upper emission surface (6) and a lower emission surface (7) are respectively provided on the first electrode bosses (8) of the upper electrode (1) and the lower electrode (4).

8. A gas discharge tube according to claim 7, characterized in that: The upper emitting surface (6) and the lower emitting surface (7) are both in a grid shape.

9. A gas discharge tube according to claim 1, characterized in that: The insulating tube (2) is a ceramic tube.

Images