Gas discharge tube and protection circuit
By designing the leads of the gas discharge tube parallel to the end surface of the end electrode, shortening the length of the discharge tube body, combined with the use of insulating enclosures, the problems of large volume and poor lead stability of the traditional gas discharge tube are solved, and a smaller volume and higher reliability are achieved.
Patent Information
- Application Number
- CN202421619087.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-09
AI Technical Summary
Traditional gas discharge tubes are large in size, occupy a large space on the circuit board, and the stress at the bending of the leads is likely to cause the leads to fall off, resulting in poor product.
A gas discharge tube is designed, with the lead wires arranged parallel to the end face of the end electrode, the length of the discharge tube body along the axis direction is shortened to L≤4mm, and the discharge tube body and the lead wires are covered with an insulating enclosure.
It reduces the axial size and volume of the gas discharge tube, reduces the size of the circuit board space, improves the stability of the leads, avoids the problem of leads falling off, and achieves higher reliability and smaller space occupancy.
Smart Images
Figure CN222966506U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of overvoltage protection, in particular to a gas discharge tube and a protection circuit. Background Art
[0002] A gas discharge tube is a switching protection device, usually used as an overvoltage protection device, and its basic working principle is gas discharge. When the voltage across the electrodes of the gas discharge tube exceeds the breakdown voltage of the gas, it will cause gap discharge, protecting the subsequent circuit connected in parallel with the gas discharge tube.
[0003] However, the volume of the traditional gas discharge tube is relatively large, occupying a large space on the circuit board. Summary of the Utility Model
[0004] In order to solve the problems existing in the prior art, one of the purposes of the utility model is to provide a gas discharge tube.
[0005] The utility model provides the following technical solutions:
[0006] A gas discharge tube, comprising:
[0007] A discharge tube body, the discharge tube body includes two end electrodes, and the two end electrodes are respectively located at both ends of the discharge tube body along the axial direction; and
[0008] Leads corresponding to the end electrodes, the leads are parallel to the end faces of the end electrodes and are connected to the corresponding end electrodes.
[0009] As a further optional solution for the discharge tube body, the length of the discharge tube body along the axial direction is L, and L≤4mm.
[0010] As a further optional solution for the discharge tube body, the lead includes a connecting section and a pin section connected to each other, the connecting section is connected to the corresponding end electrode, the connecting sections of the two leads intersect obliquely, and the pin sections of the two leads are parallel to each other.
[0011] As a further optional solution for the discharge tube body, the connecting section is arranged along the radial direction of the discharge tube body.
[0012] As a further optional solution for the discharge tube body, the gas discharge tube further includes an insulating encapsulation member, and the insulating encapsulation member covers the discharge tube body and one end of the lead close to the discharge tube body.
[0013] As a further optional solution for the discharge tube body, the insulating encapsulation member is an insulating paint layer cured on the surfaces of the discharge tube body and the lead.
[0014] As a further optional solution for the discharge tube body, the gas discharge tube further includes a soldering layer, and the lead wire is connected to the corresponding end electrode through the soldering layer.
[0015] As a further optional solution for the discharge tube body, the discharge tube body further includes a porcelain tube, the porcelain tube is arranged along the axial direction of the discharge tube body, and the two end electrodes are respectively arranged at both ends of the porcelain tube.
[0016] As a further optional solution for the discharge tube body, the discharge tube body further includes a solder sheet, the solder sheet is arranged between the end electrode and the porcelain tube, and the end electrode is connected to the porcelain tube through the solder sheet.
[0017] Another object of the present invention is to provide a protection circuit.
[0018] The present invention provides the following technical solutions:
[0019] A protection circuit includes a circuit board and the above-mentioned gas discharge tube, and one end of the lead wire away from the discharge tube body is connected to the circuit board.
[0020] The embodiments of the present invention have the following beneficial effects:
[0021] In the existing gas discharge tube, one end of the lead wire close to the discharge tube body first extends a certain distance along the axial direction of the discharge tube body, and then bends at a certain angle for connection with the circuit board. When the distance that the lead wire extends along the axial direction of the discharge tube body is too short, the stress at the bending part of the lead wire easily causes the lead wire to fall off from the discharge tube body, thereby resulting in defective products. Therefore, the distance that the lead wire of the existing gas discharge tube extends along the axial direction of the discharge tube body is generally 1-2 mm, resulting in too large an axial dimension of the entire gas discharge tube.
[0022] Compared with the existing gas discharge tube, the lead wire in the above-mentioned gas discharge tube is arranged parallel to the end face of the end electrode, and the increased axial dimension of the gas discharge tube due to the lead wire is only the diameter of the lead wire, which is smaller than the distance that the lead wire of the existing gas discharge tube extends along the axial direction of the discharge tube body. Thus, the above-mentioned gas discharge tube has a smaller volume and occupies less space on the circuit board.
[0023] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given below in conjunction with the accompanying drawings for detailed description. Description of the Drawings
[0024] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0025] Figure 1 Shows an explosion schematic diagram of a gas discharge tube in the related art;
[0026] Figure 2 Shows an overall structural schematic diagram of a gas discharge tube in the related art;
[0027] Figure 3 Shows an overall structural schematic diagram of a gas discharge tube provided by an embodiment of the present utility model;
[0028] Figure 4 Shows an explosion schematic diagram of a gas discharge tube provided by an embodiment of the present utility model;
[0029] Figure 5 Shows a structural schematic diagram of a lead in a gas discharge tube provided by an embodiment of the present utility model.
[0030] Main element symbol description:
[0031] 100 - Discharge tube body; 110 - End electrode; 120 - Porcelain tube; 130 - Solder sheet; 200 - Lead; 210 - Connection section; 220 - Pin section; 300 - Solder layer; 400 - Insulating encapsulation. Detailed implementation manners
[0032] The following will describe in detail the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.
[0033] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.
[0034] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0037] Please refer to Figure 1 , in the related art, a gas discharge tube is composed of a discharge tube body 100 and leads 200.
[0038] Among them, the discharge tube body 100 is composed of a porcelain tube 120, end electrodes 110 and solder sheets 130. The axis of the porcelain tube 120 coincides with the axis of the discharge tube body 100, and the end electrodes 110 are arranged in pairs at both ends of the porcelain tube 120 along the axial direction. The solder sheets 130 are located between the end electrodes 110 and the porcelain tube 120, and the end electrodes 110 are connected to the porcelain tube 120 through the solder sheets 130. In addition, the leads 200 extend along the axial direction of the discharge tube body 100 and there are two of them. The two leads 200 respectively correspond to the two end electrodes 110, and the ends of the leads 200 are welded to the corresponding end electrodes 110.
[0039] Please combine with Figure 2, after the gas discharge tube is further processed, one end of the lead 200 close to the discharge tube body 100 first extends a certain distance along the axis direction of the discharge tube body 100, and then bends at a certain angle for connection to the circuit board. Since the contact between the ends of the lead 200 and the electrode 110 is a point contact, when the distance that the lead 200 extends along the axis direction of the discharge tube body 100 is too short, the stress at the bending part of the lead 200 easily causes the lead 200 to fall off from the discharge tube body 100, resulting in defective products. Therefore, the distance that the lead 200 of the gas discharge tube extends along the axis direction of the discharge tube body 100 is generally 1 - 2 mm, which causes the axial dimension of the entire gas discharge tube to be too large.
[0040] Embodiment
[0041] Please refer to Figure 3 and Figure 4 , in view of the above problems, this embodiment provides a gas discharge tube, specifically a lead 200 type gas discharge tube, which includes a discharge tube body 100 and a lead 200.
[0042] Specifically, the discharge tube body 100 includes two end electrodes 110. One end electrode 110 is located at one end of the discharge tube body 100 along the axis direction, and the other end electrode 110 is located at the other end of the discharge tube body 100 along the axis direction.
[0043] In addition, the leads 200 are arranged corresponding to the end electrodes 110, and the number is two. Both leads 200 are parallel to the end face of the end electrode 110 and are connected to the corresponding end electrode 110.
[0044] Wherein, the end face of the end electrode 110 refers to the surface of the end electrode 110 that is far away from the other end electrode 110 along the axis direction of the discharge tube body 100.
[0045] Compared with the gas discharge tube in the related art, the lead 200 in the above gas discharge tube is arranged parallel to the end face of the end electrode 110. The increased axial dimension of the gas discharge tube due to the lead 200 is only the diameter of the lead 200, which is smaller than the distance that the lead 200 of the gas discharge tube in the related art extends along the axis direction of the discharge tube body 100. Thus, the above gas discharge tube has a smaller volume and occupies less space on the circuit board.
[0046] Optionally, the material of the lead 200 can be tinned copper wire, or copper clad steel wire, or other conductive materials, and this embodiment does not limit this.
[0047] In some embodiments, the above gas discharge tube further includes solder layers 300. There are two solder layers 300, which correspond to two groups of leads 200 and end electrodes 110 respectively, and the leads 200 are connected to the corresponding end electrodes 110 through the solder layers 300.
[0048] In some embodiments, considering that the lead 200 is arranged parallel to the end face of the end electrode 110 and the contact between the lead 200 and the end electrode 110 is a line contact, during the manufacturing process, two leads 200 can be used to clamp and fix the discharge tube body 100, and then the leads 200 are connected to the end electrodes 110, thus eliminating the clamping device for clamping the discharge tube body 100. On this basis, the length of the discharge tube body 100 in the axial direction is L, satisfying L≤4mm.
[0049] In the related art, the length of the discharge tube body 100 in the axial direction is not less than 6mm, and both the volume and weight are relatively large, making it difficult for the lead 200 to stably clamp and fix the discharge tube body 100. In this embodiment, the length of the discharge tube body 100 in the axial direction is not greater than 4mm, and the volume and weight are relatively small, which is conducive to the lead 200 stably clamping and fixing the discharge tube body 100.
[0050] Exemplarily, the length of the discharge tube body 100 in the axial direction is 4mm.
[0051] Please refer to Figure 5 , in some embodiments, considering that the lead 200 is arranged parallel to the end face of the end electrode 110 and the contact between the lead 200 and the end electrode 110 is a line contact, during the manufacturing process, two leads 200 can be used to clamp and fix the discharge tube body 100, and then the leads 200 are connected to the end electrodes 110, thus eliminating the clamping device for clamping the discharge tube body 100. On this basis, the lead 200 includes a connecting section 210 and a pin section 220 which are connected to each other, and the connecting section 210 is connected to the corresponding end electrode 110. In addition, the connecting sections 210 of the two leads 200 intersect obliquely, and the pin sections 220 of the two leads 200 are parallel to each other.
[0052] When the discharge tube body 100 is clamped and fixed by the lead 200, the clamping force exerted by the lead 200 on the discharge tube body 100 acts on the area of the end electrode 110 in contact with the lead 200, corresponding to the connecting section 210. Making the connecting sections 210 of the two leads 200 intersect obliquely can ensure that the discharge tube body 100 is subjected to forces that are equal in magnitude, opposite in direction and collinear from the two leads 200 at least in a certain area, which is conducive to the lead 200 stably clamping the discharge tube body 100.
[0053] Conversely, if the two leads 200 are parallel to each other, the discharge tube body 100 can be stably clamped only when the two leads 200 are completely aligned along the axial direction of the discharge tube body 100. When the two leads 200 are misaligned, no area of the discharge tube body 100 can receive forces that are equal in magnitude, opposite in direction, and collinear from the two leads 200, resulting in the discharge tube body 100 being prone to deflection and unable to be stably clamped and fixed by the leads 200.
[0054] Further, the connecting section 210 is arranged along the radial direction of the discharge tube body 100.
[0055] When the discharge tube body 100 is clamped and fixed by the leads 200, the clamping force applied by the leads 200 to the discharge tube body 100 acts on the center of the discharge tube body 100, which is beneficial for the leads 200 to clamp the discharge tube body 100 more stably.
[0056] Please refer to again Figure 3 and Figure 4 In some embodiments, the above gas discharge tube further includes an insulating encapsulation 400, and the insulating encapsulation 400 covers the discharge tube body 100 and one end of the lead 200 close to the discharge tube body 100.
[0057] It can be understood that both the end electrodes 110 and the leads 200 are made of conductive materials. When exposed, they may come into contact with other electrical components on the circuit board and cause a short circuit. Covering the discharge tube body 100 and one end of the lead 200 close to the discharge tube body 100 with the insulating encapsulation 400 can effectively solve this problem.
[0058] In addition, when the length of the discharge tube body 100 along the axial direction is not greater than 4 mm, the distance between the two end electrodes 110 is too short, and it may occur that the air outside the discharge tube body 100 is broken down by the current to conduct the two end electrodes 110, which will also affect other electrical components on the circuit board. After covering the discharge tube body 100 and one end of the lead 200 close to the discharge tube body 100 with the insulating encapsulation 400, no discharge path can be formed outside the discharge tube body 100, making the gap discharge process stable and controllable, which is beneficial to the normal operation of the above gas discharge tube and other electrical components on the circuit board.
[0059] In some embodiments, the insulating encapsulation 400 is an insulating paint layer cured on the surfaces of the discharge tube body 100 and the lead 200.
[0060] Specifically, the insulating paint adheres to the surfaces of the discharge tube body 100 and the lead 200 by spraying or dipping, etc., and forms an insulating paint layer after curing, which can stably and fully cover the discharge tube body 100 and one end of the lead 200 close to the discharge tube body 100.
[0061] Exemplarily, the insulating varnish can be epoxy resin or phenolic resin, and this embodiment does not limit this.
[0062] In some embodiments, the discharge tube body 100 further includes a porcelain tube 120. The porcelain tube 120 is arranged along the axis direction of the discharge tube body 100, and the axis of the porcelain tube 120 coincides with the axis of the discharge tube body 100.
[0063] Correspondingly, one end electrode 110 is arranged at one end of the porcelain tube 120 along the axis direction, and the other end electrode 110 is arranged at the other end of the porcelain tube 120 along the axis direction.
[0064] During use, an inert gas is injected into the lumen of the porcelain tube 120. When the size of the discharge tube body 100 is fixed, by selecting an inert gas with an appropriate conductivity, the breakdown voltage of the discharge tube body 100 can be controlled to be adapted to the safe operating voltage of the circuit.
[0065] It can be understood that in a harsh environment, the porcelain tube 120 may absorb moisture, which may affect the performance of the above gas discharge tube. However, the insulating encapsulation 400 wraps the porcelain tube 120, which can prevent the porcelain tube 120 from contacting the water vapor in the external environment, thereby avoiding the porcelain tube 120 from absorbing moisture and being beneficial to the reliable operation of the above gas discharge tube.
[0066] Furthermore, the discharge tube body 100 further includes solder sheets 130. The number of solder sheets 130 is two, which are respectively located between the two end electrodes 110 and the porcelain tube 120, and the end electrodes 110 are connected to the porcelain tube 120 through the solder sheets 130.
[0067] In summary, the lead 200 in the above gas discharge tube is arranged parallel to the end face of the end electrode 110. The additional axial dimension of the gas discharge tube due to the lead 200 is only the diameter of the lead 200, which is smaller than the distance that the lead 200 of the gas discharge tube in the related art extends along the axis direction of the discharge tube body 100. At the same time, the length of the discharge tube body 100 along the axis direction is smaller, making the above gas discharge tube smaller in volume, occupying less space on the circuit board, and saving up to 70% of the space compared with the traditional gas discharge tube. On this basis, the material cost can be further saved to meet the cost reduction requirements of users.
[0068] The insulating encapsulation 400 is used to wrap the discharge tube body 100 and the end of the lead 200 close to the discharge tube body 100, making the outside of the device completely enclosed, with better protection and higher reliability, and more in line with the high-standard PCB design specifications and requirements. In addition, the encapsulated gas discharge tube has no discharge tube flash during discharge, and will not cause panic to users.
[0069] This embodiment also provides a protection circuit, including a circuit board and the above-mentioned gas discharge tube. One end of the lead 200 away from the discharge tube body 100 is connected to the circuit board.
[0070] In all examples shown and described herein, any specific values should be construed as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values.
[0071] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0072] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.
Claims
1. A gas discharge tube, characterized in that: include: A discharge tube body, the discharge tube body comprising two end electrodes, the two end electrodes being respectively located at two ends of the discharge tube body along the axial direction; as well as A lead wire is arranged corresponding to the terminal electrode, wherein the lead wire is parallel to the end surface of the terminal electrode and is connected to the corresponding terminal electrode.
2. The gas discharge tube according to claim 1, characterized in that The length of the discharge tube body along the axial direction is L, and L≤4mm.
3. The gas discharge tube according to claim 1, characterized in that The lead wires include a connecting segment and a pin segment that are connected to each other. The connecting segment is connected to the corresponding terminal electrode. The connecting segments of two lead wires intersect obliquely, and the pin segments of two lead wires are parallel to each other.
4. The gas discharge tube according to claim 3, characterized in that: The connecting section is arranged along the radial direction of the discharge tube body.
5. The gas discharge tube according to any one of claims 1 to 4, characterized in that: The gas discharge tube further comprises an insulating encapsulation member, wherein the insulating encapsulation member encapsulates the discharge tube body and an end of the lead wire close to the discharge tube body.
6. The gas discharge tube according to claim 5, characterized in that The insulating encapsulation member is an insulating paint layer cured on the surface of the discharge tube body and the lead wire.
7. The gas discharge tube according to any one of claims 1 to 4, characterized in that: The gas discharge tube further comprises a solder layer, and the lead wire is connected to the corresponding terminal electrode through the solder layer.
8. The gas discharge tube according to any one of claims 1 to 4, characterized in that: The discharge tube body further comprises a porcelain tube, which is arranged along the axial direction of the discharge tube body, and the two end electrodes are respectively arranged at two ends of the porcelain tube.
9. The gas discharge tube according to claim 8, characterized in that: The discharge tube body further comprises a solder sheet, which is arranged between the end electrode and the porcelain tube, and the end electrode is connected to the porcelain tube via the solder sheet.
10. A protection circuit, characterized in that: The invention comprises a circuit board and the gas discharge tube according to any one of claims 1 to 9, wherein one end of the lead wire away from the discharge tube body is connected to the circuit board.