A gas discharge tube

Abstract

The present invention belongs to the technical field of electronic devices, and specifically discloses a gas discharge tube, including an upper electrode, a lower electrode, and an insulating tube body, wherein the upper electrode includes an upper pole cap and an upper pole seat; the lower electrode includes a lower pole cap and a lower pole seat; the upper pole cap is covered on the lower pole cap, and a first gap is provided between the top surface of the lower pole cap and the inner bottom surface of the upper pole cap; the insulating tube body is sleeved on the lower pole cap and the two ends are respectively sealed and fastened with the upper pole seat and the lower pole seat, and a second gap is provided between the outer peripheral surface of the lower pole cap and the inner wall of the insulating tube body, and the spacing of the second gap is smaller than the spacing of the first gap. The gas discharge tube designed with this structure is not only compact, stable and reliable, but also can effectively improve the electrical performance of the gas discharge tube.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and in particular to a gas discharge tube. Background Art

[0002] The gas discharge tube is a switch type protection device, usually used as an overvoltage protection device. The gas discharge tube commonly used at present is composed of an insulating tube body and electrodes sealed at both ends, and the inner cavity is filled with inert gas. When the voltage at both ends of the gas discharge tube electrode exceeds the breakdown voltage of the gas, it will cause gap discharge, and the gas discharge tube will quickly change from a high resistance state to a low resistance state, forming a conduction, thereby protecting other devices connected in parallel with it.

[0003] As the application environment of gas discharge tubes becomes more and more complex, customers have more and more requirements for discharge tubes, and the performance requirements for discharge tubes are becoming more and more stringent, and the requirements for miniaturization of discharge tubes are becoming higher and higher. For example, the national standard GB9043-2008 for lightning strikes requires ±5T, and the DC turn-on voltage and impulse breakdown voltage of gas discharge tubes can be combined with the standard. Customers will increase the lightning strike requirements to ±20T according to the application scenario, and its DC turn-on voltage and impulse breakdown voltage still need to meet the national standard requirements. Previously, 8 / 20μs@20KA required the use of φ16mm products, but due to the requirement for miniaturization, φ12mm needs to meet this requirement.

[0004] Furthermore, in addition to the overvoltage protection capability, customers also expect the discharge tube to meet other functional requirements, such as the ability to break the power frequency continuous current, power frequency tolerance, transient overvoltage tolerance, wide range current open circuit failure and other overcurrent capabilities. Meeting these new requirements often affects the overvoltage protection capability of the discharge tube itself. For example, the emergence of the discharge tube with open circuit failure is a gas discharge tube that can protect against both overvoltage and overcurrent. The traditional open circuit failure discharge tube has poor open circuit stability and consistency, and the open circuit capability and the discharge tube current capacity are contradictory. Summary of the invention

[0005] The object of the present invention is to provide a gas discharge tube which is not only compact in structure, small in size, and easy to assemble, but also capable of improving the electrical performance of the gas discharge tube.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A gas discharge tube, comprising:

[0008] An upper electrode and a lower electrode, wherein the upper electrode comprises an upper pole cap and an upper pole seat extending horizontally from the edge of the upper pole cap port; the lower electrode comprises a lower pole cap and a lower pole seat extending horizontally from the edge of the lower pole cap port; the upper pole cap is covered on the lower pole cap, and a first gap is provided between the top surface of the lower pole cap and the inner bottom surface of the upper pole cap;

[0009] The insulating tube body is sleeved on the lower pole cap and its two ends are respectively sealed and fastened to the upper pole seat and the lower pole seat. A second gap is provided between the outer peripheral surface of the lower pole cap and the inner wall of the insulating tube body, and the spacing of the second gap is smaller than the spacing of the first gap.

[0010] A mounting hole is formed through the top surface of the lower pole cap, an electrode is arranged in the mounting hole, and the electrode is sealed and fastened to the lower pole cap through a low-temperature seal.

[0011] The electrode is arranged in a "J" shape or a "T" shape, the top surface of the electrode is exposed in the first gap, and a cathode emission layer or an anode emission layer is arranged on the top surface of the electrode.

[0012] Wherein, the upper electrode and the lower electrode are both formed by integrally stamping sheets.

[0013] The first gap and the second gap are interconnected to form a sealed cavity, and the sealed cavity is filled with one or more of neon, argon, hydrogen, nitrogen, krypton, xenon and helium.

[0014] The demoulding slopes of the cavities of the upper pole cap and the lower pole cap are both greater than 0 degrees and less than 10 degrees, and the top surface of the lower pole cap and the inner bottom surface of the upper pole cap are both provided with a cathode emission layer or an anode emission layer.

[0015] Wherein, the top surface of the lower pole cap and the inner bottom surface of the upper pole cap are both provided with honeycomb-shaped concave surfaces, and the honeycomb-shaped concave surfaces are both coated with electrode emission materials for forming cathode emission layers or anode emission layers.

[0016] Wherein, the insulating tube body is configured as an insulating ceramic tube, and both end surfaces of the insulating tube body are sealed and welded to the upper pole seat and the lower pole seat through sealing members.

[0017] Wherein, the top surface of the lower pole cap is located in the cavity of the upper pole cap, and a trigger conductive belt is arranged in the second gap.

[0018] Wherein, both the upper pole seat and the lower pole seat have wiring plates extending horizontally.

[0019] The beneficial effects of the present invention are as follows: the present invention discloses a gas discharge tube, comprising an upper electrode, a lower electrode, and an insulating tube body, wherein the upper electrode comprises an upper pole cap and an upper pole seat; the lower electrode comprises a lower pole cap and a lower pole seat; the upper pole cap is covered on the lower pole cap, and a first gap is provided between the top surface of the lower pole cap and the inner bottom surface of the upper pole cap; the insulating tube body is sleeved on the lower pole cap and the two ends are respectively sealed and fastened with the upper pole seat and the lower pole seat, and a second gap is provided between the outer peripheral surface of the lower pole cap and the inner wall of the insulating tube body, and the spacing of the second gap is smaller than the spacing of the first gap. The gas discharge tube designed with this structure is not only compact, stable and reliable, but also can effectively improve the electrical performance of the gas discharge tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axonometric diagram of a gas discharge tube in this embodiment.

[0021] Figure 2 yes Figure 1 main view.

[0022] Figure 3 yes Figure 2 A cross-sectional view of the first embodiment in section AA.

[0023] Figure 4 yes Figure 2 A cross-sectional view of the second embodiment in section AA.

[0024] In the figure:

[0025] 1. Upper electrode; 11. Upper electrode cap; 12. Upper electrode seat; 13. Wiring board; 14. First gap;

[0026] 2. Lower electrode; 21. Lower pole cap; 22. Lower pole seat; 23. Second gap; 3. Insulating tube body; 4. Triggering conductive belt; 5. Electrode; 6. Low-temperature seal. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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. 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 invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Figure 1 is an axonometric diagram of a gas discharge tube in this embodiment; Figure 2 yes Figure 1 The main view; Figure 3 yes Figure 2 A cross-sectional view of the first embodiment in section AA; Figure 4 yes Figure 2 A cross-sectional view of the second embodiment in section AA. Figures 1 to 4 As shown, the gas discharge tube provided in this embodiment has not only a compact structure and good electrical performance, but also is easy to process and has a low production cost.

[0032] Embodiment 1

[0033] The present embodiment provides a gas discharge tube, which is composed of several parts such as an upper electrode 1, a lower electrode 2 and an insulating tube body 3. Preferably, the upper electrode 1 in the present embodiment includes an upper pole cap 11 and an upper pole seat 12 horizontally extending from the edge of the port of the upper pole cap 11. Further preferably, in order to effectively reduce the production cost of the gas discharge tube and improve the processing efficiency, the upper pole cap 11 and the upper pole seat 12 in the present embodiment are formed by integrally stamping and bending of sheets, and the edge of the upper pole seat 12 of the formed upper electrode 1 is extended with a wiring plate 13 to facilitate electrical connection with an external power supply device; the present embodiment is also provided with a honeycomb concave surface in the middle of the inner bottom surface of the above-mentioned upper pole cap 11, and the honeycomb concave surface is coated with an electrode emission material for forming a cathode emission layer or an anode emission layer.

[0034] Specifically, the structure of the lower electrode 2 in this embodiment is substantially the same as the structure and processing technology of the upper electrode 1. Preferably, the lower electrode 2 in this embodiment includes a lower pole cap 21 and a lower pole seat 22 extending horizontally from the edge of the port of the lower pole cap 21. Preferably, in order to effectively reduce the production cost of the gas discharge tube and improve the processing efficiency, the lower pole cap 21 and the lower pole seat 22 in this embodiment are formed by stamping and bending the sheet as a whole. Furthermore, in order to facilitate the demolding of the mold during stamping, preferably, the cavity demolding slopes of the upper pole cap 11 and the lower pole cap 21 are both greater than 0 degrees and less than 10 degrees. Preferably, in this embodiment, the cavity demolding slopes of the upper pole cap 11 and the lower pole cap 21 are both set to 4 degrees. The edge of the lower pole seat 22 of the lower electrode 2 formed in this way also extends with a wiring plate 13, so as to facilitate electrical connection with an external power supply device.

[0035] In addition, the upper electrode 1 and the lower electrode 2 integrally stamped and formed by the sheet material are bent multiple times, which greatly alleviates the damage to the gas discharge tube caused by stress release during the subsequent high-temperature sealing of the gas discharge tube due to the processing stress of the material; in particular, the tearing of the joint surface between the upper electrode 1 and the lower electrode 2 and the insulating tube body 3 is reduced, thereby effectively improving the safety and reliability of the gas discharge tube.

[0036] Different from the upper electrode 1, the honeycomb concave surface on the lower pole cap 21 in this embodiment is arranged in the middle of the top surface of the lower pole cap 21, and is arranged opposite to the honeycomb concave surface on the inner bottom surface of the upper pole cap 11. Similar to the upper pole cap 11, the honeycomb concave surface on the lower pole cap 21 is also coated with an electrode emission material for forming a cathode emission layer or an anode emission layer.

[0037] Preferably, in this embodiment, the honeycomb concave surface on the lower pole cap 21 is coated with the same electrode emission material as the honeycomb concave surface on the upper pole cap 11, and both are set to be cathode emission materials for forming cathode emission layers. The specific components of the cathode emission materials in this embodiment are commonly used in related technologies and will not be described in detail here.

[0038] When assembling the upper pole cap 11 and the lower pole cap 21 with the above-mentioned structural design, the insulating tube body 3 can be sleeved on the lower pole cap 21 first, and then the upper electrode 1 can be covered to the upper end of the insulating tube body 3, and then the two ends of the insulating tube body 3 are sealed and welded to the upper pole seat 12 and the lower pole seat 22 by sealing solder. Preferably, the insulating tube body 3 in this embodiment is preferably a ceramic sleeve, and the gas discharge tube housing assembled in this way can not only effectively reduce the volume of the gas discharge tube, but also make the structure of the gas discharge tube more compact and the assembly more convenient and quick.

[0039] To be more specific, preferably, a first gap 14 is provided between the top surface of the lower pole cap 21 of the gas discharge tube with the above-mentioned structure and the inner bottom surface of the upper pole cap 11, and a second gap 23 is provided between the outer peripheral surface of the lower pole cap 21 and the inner wall of the insulating tube body 3, the spacing of the second gap 23 is smaller than the spacing of the first gap 14, and a trigger conductive belt 4 is provided in the second gap 23; further preferably, the first gap 14 and the second gap 23 are interconnected to form a sealed cavity, and the sealed cavity is filled with one or more of neon, argon, hydrogen, nitrogen, krypton, xenon and helium, and preferably, nitrogen is preferred in this embodiment.

[0040] The first gap 14 arranged in the above manner forms the main discharge space of the gas discharge tube in this embodiment, and the second gap 23 constitutes the trigger discharge space of the gas discharge tube in this embodiment.

[0041] In addition, the main discharge space is larger than the trigger discharge space. When lightning strikes, the impact on the discharge tube first acts on the main discharge space. The impact force first acts on the top surface of the lower pole cap 21, and then is transmitted to the joint surface between the upper electrode 1 and the lower electrode 2 and the insulating tube body 3, which is beneficial to alleviate the structural damage to the joint surface, thereby improving the current flow and multiple impact capabilities of the gas discharge tube.

[0042] In addition, the gas discharge tube adopting the above-mentioned structural design has the upper electrode 1 and the lower electrode 2 respectively arranged in a cap-shaped structure, the top surface of the lower pole cap 21 in the lower electrode 2 extends into the cavity of the upper pole cap 11 in the upper electrode 1, and the top surface of the lower pole cap 21 in the lower electrode 2 is higher than the top surface of the insulating tube body 3, so that the specific surface area of ​​the upper electrode 1 and the lower electrode 2 per unit mass is the largest, and the heat dissipation effect is the best. The lightning strike and power frequency current tolerance of the gas discharge tube will be improved. For example: it can increase the number of lightning strikes suffered by the discharge tube, can increase the power frequency current tolerance time, and is not easy to burn due to local overheating when the AC255v, 100A continuous current is broken, and during the transient overvoltage tolerance test.

[0043] Furthermore, in the gas discharge tube adopting the above-mentioned structural design, the sputtering and evaporation products generated by the discharge in the main discharge gap will sputter and evaporate on the side of the electrolysis, that is, the top surface of the lower pole cap 21, thereby effectively reducing the amount of light reaching the trigger discharge space; greatly alleviating the pollution to the inner side of the insulating tube body 3, and also alleviating the damage to the trigger conductive belt 4; the response speed and residual voltage of the discharge tube will not be significantly deteriorated after multiple lightning strikes.

[0044] Furthermore, since the main discharge space is wrapped by the upper electrode 1, it has a shielding effect on the external electromagnetic field and is not affected by the external electromagnetic environment during the continuous current break or transient overvoltage tolerance, which is beneficial to improving its stability.

[0045] Embodiment 2

[0046] Different from the first embodiment, the present embodiment further has a mounting hole through the top surface of the lower pole cap 21, and an electrode 5 is arranged in the mounting hole, and the electrode 5 is sealed and fastened to the lower pole cap 21 through a low-temperature seal. Preferably, the low-temperature seal 6 in the present embodiment is a low-temperature solder or a low-temperature adhesive; further preferably, the electrode 5 in the present embodiment is arranged in a "J" shape or a "T" shape, and the top surface of the electrode 5 is exposed in the first gap 14, that is, in the main discharge space. As in the first embodiment, the top surface of the electrode 5 is provided with a cathode emission layer or an anode emission layer, which is the same as the cathode emission layer or the anode emission layer on the inner bottom surface of the upper pole cap 11 above.

[0047] In the gas discharge tube provided in the second embodiment, the main discharge space and the trigger discharge space are surrounded by the upper electrode 1 and the lower electrode 2. During discharge, the upper electrode 1 and the lower electrode 2 can provide a good shielding effect and are not affected by the external electric field, which is beneficial to the consistency and stability of the power frequency open circuit.

[0048] In addition, the structure has the function of quickly transferring the temperature generated by the arc discharge to the low-temperature seal 6. The low-temperature seal 6 is heated, so that the sealing of the gas discharge tube is destroyed to form an open circuit, and then it plays a role in safe failure. In addition, the structure has a good heat dissipation effect, which can ensure that a thermal balance is formed when there is a small current and power frequency overcurrent without burning the gas discharge tube; when the current is large, it will not cause burning or melting short circuit due to overheating and cause unsafe failure. Because the structure has a good heat dissipation effect, it has a good and stable open circuit failure function at a large current such as 50A without increasing the gap.

[0049] In addition, the "J"-shaped or "T"-shaped electrode 5 is deeply hidden in the pit of the lower electrode 2. When the power frequency current fails to open the circuit, the airtightness is destroyed, causing the gas discharge tube to expand and spray outward to release pressure, thereby reducing the impact on the internal cavity of the gas discharge tube, thereby reducing the probability of fire or explosion, and effectively improving the safety and reliability of the gas discharge tube.

[0050] The gas discharge tubes provided in the above-mentioned embodiments 1 and 2 have the following advantages compared with the gas discharge tubes in the related art:

[0051] 1. It can solve the problem of product miniaturization and meet the same performance requirements in a smaller volume;

[0052] 2. Improve the overvoltage protection capability of the discharge tube, for example, the response speed of the discharge tube will not decrease significantly after increasing the number of lightning strikes, and then fail;

[0053] 3. Increase the discharge tube's continuous current breaking capacity (AC255V, 100A) and transient overvoltage tolerance (AC1200V, 300A, 0.2S).

[0054] Compared with open circuit failure gas discharge tube, it has the following advantages:

[0055] 1) While not sacrificing the discharge tube's overcurrent overvoltage capability, increase its overcurrent open circuit breaking capability, for example, from 30A to 50A;

[0056] 2) Broaden the breaking current opening capacity, and the breaking current range is wider;

[0057] 3) Improve the consistency and stability of current open circuit breaking;

[0058] 4) Ensure that transient overvoltage tolerance is in tolerance or open circuit mode and will not cause fire or short circuit.

[0059] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A gas discharge tube, characterized in that: include: An upper electrode (1) and a lower electrode (2), wherein the upper electrode (1) comprises an upper pole cap (11) and an upper pole seat (12) extending horizontally from the edge of a port of the upper pole cap (11); the lower electrode (2) comprises a lower pole cap (21) and a lower pole seat (22) extending horizontally from the edge of a port of the lower pole cap (21); the upper pole cap (11) is covered on the lower pole cap (21), and a first gap (14) is provided between the top surface of the lower pole cap (21) and the inner bottom surface of the upper pole cap (11); The insulating tube body (3) is sleeved on the lower pole cap (21) and its two ends are respectively sealed and fastened to the upper pole seat (12) and the lower pole seat (22); a second gap (23) is provided between the outer peripheral surface of the lower pole cap (21) and the inner wall of the insulating tube body (3); the spacing of the second gap (23) is smaller than the spacing of the first gap (14); wherein: The top surface of the lower pole cap (21) is located in the cavity of the upper pole cap (11), and a trigger conductive strip (4) is arranged in the second gap (23).

2. A gas discharge tube according to claim 1, characterized in that: A mounting hole is provided through the top surface of the lower pole cap (21), an electrode (5) is provided in the mounting hole, and the electrode (5) is sealed and fastened to the lower pole cap (21) via a low-temperature seal (6).

3. A gas discharge tube according to claim 2, characterized in that: The electrode (5) is arranged in a "J" shape or a "T" shape, the top surface of the electrode (5) is exposed in the first gap (14), and the top surface of the electrode (5) is provided with a cathode emission layer or an anode emission layer.

4. A gas discharge tube according to claim 1, characterized in that: The upper electrode (1) and the lower electrode (2) are both formed by integrally stamping sheets.

5. A gas discharge tube according to claim 1, characterized in that: The first gap (14) and the second gap (23) are interconnected to form a sealed cavity, and the sealed cavity is filled with one or more of neon, argon, hydrogen, nitrogen, krypton, xenon and helium.

6. A gas discharge tube according to claim 1, characterized in that: The cavity demoulding slopes of the upper pole cap (11) and the lower pole cap (21) are both greater than 0 degrees and less than 10 degrees, and the top surface of the lower pole cap (21) and the inner bottom surface of the upper pole cap (11) are both provided with a cathode emission layer or an anode emission layer.

7. A gas discharge tube according to claim 1, characterized in that: The top surface of the lower pole cap (21) and the inner bottom surface of the upper pole cap (11) are both provided with honeycomb-shaped concave surfaces, and the honeycomb-shaped concave surfaces are both coated with electrode emission materials for forming a cathode emission layer or an anode emission layer.

8. A gas discharge tube according to claim 1, characterized in that: The insulating tube body (3) is configured as an insulating ceramic tube, and both end surfaces of the insulating tube body (3) are sealed and welded to the upper pole seat (12) and the lower pole seat (22) via sealing members.

9. A gas discharge tube according to claim 1, characterized in that: The upper pole seat (12) and the lower pole seat (22) are both horizontally extended with a wiring plate (13).

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