Overvoltage protection device, gas discharge tube and preparation method thereof

Abstract

The present application belongs to the technical field of overvoltage protection equipment, and provides an overvoltage protection device, an active fault-cutting gas discharge tube and a preparation method thereof, wherein the gas discharge tube comprises a first insulating tube body, two electrodes and two connectors. The two electrodes are respectively arranged at the two ends of the first insulating tube body, and enclose the first insulating tube body to form a discharge cavity, and the surfaces of the two electrodes facing the discharge cavity form a discharge surface; each connector is clamped between the corresponding electrode and the first insulating tube body, and is used to seal and connect the corresponding electrode to the first insulating tube body, and both connectors are provided with a high-temperature connection part, and at least one of the two connectors is also provided with a low-temperature connection part, and the low-temperature connection part is connected to the high-temperature connection part end to end in a ring shape, and the melting point of the low-temperature connection part is lower than the melting point of the high-temperature connection part. The gas discharge tube provided by the present application has a strong ability to cut off the power frequency continuous current, and the electrode will not be disconnected from the first insulating tube body, and the overall safety of the gas discharge tube is high.

Description

Technical Field

[0001] The present application relates to the technical field of overvoltage protection equipment, and in particular to an overvoltage protection device, an active fault-cutting gas discharge tube, and a preparation method thereof. Background Art

[0002] Gas discharge tubes are usually used as overvoltage protection devices. The gas discharge tubes currently used generally include an insulating tube body and two electrodes. The two electrodes are sealed and connected to the two ends of the insulating tube body, and the insulating tube body encloses a discharge cavity for filling with inert gas. When the voltage at both ends of the gas discharge tube electrode exceeds the breakdown voltage of the inert gas, it will cause gap discharge, causing the gas discharge tube to quickly change from a high resistance state to a low resistance state, discharging the lightning current or overvoltage into the ground, thereby protecting other devices connected in parallel with the gas discharge tube.

[0003] When the short-circuit current of the gas discharge tube is too large during operation, its power frequency continuous current is very large, and the power frequency continuous current in the discharge tube is difficult to block or extinguish. At this time, the power frequency short-circuit arc in the discharge tube continues to burn, forming a short circuit. The protected equipment cannot operate normally, and continuous burning will cause the discharge tube to explode, and the high-speed sputtering of the explosion products will also damage the equipment. Therefore, the existing gas discharge tube has the technical problem of low safety performance. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an overvoltage protection device, an active fault-cutting gas discharge tube and a preparation method thereof, so as to solve the technical problem of low safety performance of gas discharge tubes existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide an active fault-cutting gas discharge tube, the active fault-cutting gas discharge tube comprising:

[0006] A first insulating tube body;

[0007] Two electrodes, the two electrodes are respectively disposed at two ends of the first insulating tube body and enclosed with the first insulating tube body to form a discharge cavity, and the surfaces of the two electrodes facing the discharge cavity form a discharge surface; and

[0008] Two connecting pieces, each of which is clamped between the corresponding electrode and the first insulating tube body, and is used to seal and connect the corresponding electrode to the first insulating tube body. Both of the connecting pieces are provided with a high-temperature connecting part, and at least one of the two connecting pieces is also provided with a low-temperature connecting part. The low-temperature connecting part is connected end to end with the corresponding high-temperature connecting part to form a ring, and the melting point of the low-temperature connecting part is lower than the melting point of the high-temperature connecting part.

[0009] In one embodiment, the low temperature connection portion is a combination of one or more of low temperature solder, low temperature adhesive or silica gel.

[0010] In one embodiment, the high temperature connection portion is a high temperature solder.

[0011] In one embodiment, the discharge surface of the electrode is a plane or a convex surface.

[0012] In one embodiment, the active fault-cutting gas discharge tube also includes a second insulating tube body, which is sleeved on the periphery of the first insulating tube body and spaced apart from the first insulating tube body, and both ends of the second insulating tube body are respectively sealed and connected to the two electrodes, and the second insulating tube body, the first insulating tube body and the two electrodes together form a gas containing cavity.

[0013] In one embodiment, the gas containing chamber is used to contain an inert gas and / or air.

[0014] In one embodiment, the electrode is formed integrally from a conductive material;

[0015] Alternatively, the electrode includes a conductive part and an insulating part that are connected to each other, the conductive part covers the end of the first insulating tube body and is used to enclose the discharge cavity together with the first insulating tube body, and the insulating part is arranged around the outer circumference of the conductive part and is used to enclose the first insulating tube body and the second insulating tube body to form the gas containing cavity.

[0016] In order to achieve the above-mentioned purpose, the present application also provides an overvoltage protection device, which includes the above-mentioned active fault-cutting gas discharge tube.

[0017] To achieve the above object, the present application also provides a method for preparing a gas discharge tube with active fault removal, the method being used to prepare the above gas discharge tube with active fault removal, the method comprising:

[0018] Prepare materials: prepare the two electrodes, the two connectors and the first insulating tube, wherein the discharge surfaces of the two electrodes are coated with electron emission materials, the two connectors each include a high-temperature connector, and at least one of the two connectors includes a high-temperature connector and a low-temperature connector, and the melting point of the high-temperature connector is higher than the melting point of the low-temperature connector;

[0019] Assembly: The two electrodes are respectively arranged at two ends of the first insulating tube body, and each connecting piece is clamped between the corresponding electrode and the first insulating tube body;

[0020] Welding: In an inert gas environment, a welding furnace is used to melt each of the connecting parts and then the corresponding electrode is fixedly connected to the first insulating tube body.

[0021] In one embodiment, the step of preparing the two connecting members comprises:

[0022] Preparing an annular high-temperature connection portion, and forming the low-temperature connection portion by vapor deposition within a predetermined range on the surface of the annular high-temperature connection portion;

[0023] Alternatively, the high-temperature connecting part and the low-temperature connecting part are cast in sections to form the connecting piece.

[0024] In one embodiment, the method for preparing the active fault-cutting gas discharge tube further comprises preparing a second insulating tube body in the material preparation step;

[0025] The assembling step further includes sleeve-arranging the second insulating tube body on the outer circumference of the first insulating tube body and arranging the second insulating tube body spaced apart from the first insulating tube body;

[0026] After the welding step, the method further includes coating a high temperature resistant sealant layer at the interface between the two electrodes and the second insulating tube body in an inert gas environment or an air environment, so that the two ends of the second insulating tube body are respectively sealed and connected to the two electrodes.

[0027] The beneficial effect of the active fault-cutting gas discharge tube provided by the present application is that: compared with the prior art, the active fault-cutting gas discharge tube provided by the present application, by providing a connector having both a low-temperature connection part and a high-temperature connection part, when the lightning current or overvoltage is too large, resulting in excessive power frequency continuous current in the gas discharge tube or the duration is too long, when the temperature in the discharge cavity gradually rises to the melting point of the low-temperature connection part, the low-temperature connection part melts, and an opening is formed at the end of the first insulating tube body, so that gas exchange can be carried out inside and outside the discharge cavity, thereby cutting off the power frequency continuous current, avoiding the explosion of the gas discharge tube, and improving the gas discharge. The safety performance of the gas discharge tube is improved; and, since the melting point of the high-temperature connection part in the connector is higher than the melting point of the low-temperature connection part, after the temperature in the discharge chamber reaches the melting point of the low-temperature connection part, the high-temperature connection part will still not melt, and the connector will not produce excessive molten droplets, which can prevent the molten droplets from splashing onto the first insulating tube body and causing a short circuit in the first insulating tube body, thereby improving the safety performance of the gas discharge tube. Moreover, since the high-temperature connection part can keep the two electrodes connected to the first insulating tube body, it can also prevent the electrodes from collapsing from the first insulating tube body and causing an impact on external personnel or equipment, thereby further improving the safety performance of the gas discharge tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 A schematic diagram of the structure of a gas discharge tube that actively cuts off a fault provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the explosion structure of the active removal of a faulty gas discharge tube provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of a top view of the structure of an active fault-cutting gas discharge tube provided in an embodiment of the present application;

[0032] Figure 4 for Figure 3 The AA sectional view of the active fault removal type gas discharge tube shown;

[0033] Figure 5 A test principle diagram of a fault response characteristic test of a gas discharge tube provided in an embodiment of the present application;

[0034] Figure 6 This is a voltage waveform diagram of the sampling resistor when the gas discharge tube provided in the embodiment of the present application is subjected to a fault response characteristic test.

[0035] Among them, the reference numerals in the figure are:

[0036] 100 - first insulating tube body; 200 - electrode; 210 - discharge surface; 300 - connector; 310 - high temperature connection part; 320 - low temperature connection part; 400 - discharge chamber; 500 - second insulating tube body; 600 - gas containing chamber; 700 - high temperature resistant sealant layer. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0038] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0041] See also Figure 1 and Figure 2 , the active fault-cutting gas discharge tube provided in the embodiment of the present application is now described. The active fault-cutting gas discharge tube comprises a first insulating tube body 100, two electrodes 200 and two connectors 300. The two electrodes 200 are respectively arranged at the two ends of the first insulating tube body 100, and enclose the first insulating tube body 100 to form a discharge cavity 400, and the surfaces of the two electrodes 200 facing the discharge cavity 400 form a discharge surface 210; each connector 300 is sandwiched between the corresponding electrode 200 and the first insulating tube body 100, and is used to seal and connect the corresponding electrode 200 to the first insulating tube body 100, and the two connectors 300 are both provided with a high-temperature connecting part 310, and at least one of the two connectors 300 is also provided with a low-temperature connecting part 320, and the low-temperature connecting part 320 is connected to the corresponding high-temperature connecting part 310 end to end to form a ring, and the melting point of the low-temperature connecting part 320 is lower than the melting point of the high-temperature connecting part 310.

[0042] Specifically, the gas discharge tube may be a diode, a triode or a multiode, and may be configured as required, and is not limited here.

[0043] Specifically, the first insulating tube body 100 can be a ceramic tube body, a glass tube body or other tube bodies suitable for making a gas discharge tube, and can be configured as needed, which is not limited here.

[0044] Specifically, the surface area of ​​the electrode 200 close to the first insulating tube body 100 is larger than the end surface area of ​​the first insulating tube body 100, one end of the first insulating tube body 100 is connected to the middle of the surface of one of the electrodes 200 close to the first insulating tube body 100, and the other end of the first insulating tube body 100 is connected to the middle of the surface of the other electrode 200 close to the first insulating tube body 100.

[0045] Specifically, both connectors 300 may be provided with a low-temperature connector 320, so that when the internal temperature of the discharge chamber 400 of the gas discharge tube reaches the melting point of the low-temperature connector 320, both ends of the gas discharge tube will have openings formed by the melting of the low-temperature connector 320, which facilitates the rapid exchange of gas inside and outside the discharge chamber 400, thereby more timely cutting off the power frequency continuous current, and having good safety performance. Of course, the two connectors 300 may also be configured such that one connector 300 is provided with both a low-temperature connector 320 and a high-temperature connector 310, and the other connector 300 is provided with only a high-temperature connector 310, which can reduce the use of connectors 300 provided with both a high-temperature connector 310 and a low-temperature connector 320, reduce manufacturing costs, and improve manufacturing efficiency.

[0046] Furthermore, in the connector 300 provided with the low-temperature connection part 320, the number of the low-temperature connection parts 320 may be one, two, etc., and the number of the high-temperature connection parts 310 may also be one, two, etc. For example, the connector 300 provided with the low-temperature connection part 320 may include one low-temperature connection part 320 and one high-temperature connection part 310, and the low-temperature connection part 320 and the high-temperature connection part 310 are connected end to end to form a ring. For another example, the connector 300 provided with the low-temperature connection part 320 may include two low-temperature connection parts 320 and two high-temperature connection parts 310, and the two low-temperature connection parts 320 and the two high-temperature connection parts 310 are alternately connected end to end to form a ring. When the low-temperature connection part 320 melts, openings can be formed at different positions of the discharge chamber 400.

[0047] It should be noted that the melting points of the low temperature connection part 320 and the high temperature connection part 310 can be selected according to the current carrying capacity, impulse breakdown voltage, etc. of the gas discharge tube, and are not limited here.

[0048] Generally, the high temperature connection part 310 refers to a connection part with a melting point of 700°C or more, and the high temperature is a temperature of 700°C or more. The low temperature is a lower temperature relative to the high temperature, which is a temperature of 400°C or less. The low temperature connection part 320 refers to a connection part with a melting point less than or equal to 400°C. Preferably, the low temperature is a temperature between 300°C and 400°C. The low temperature connection part 320 refers to a connection part with a melting point between 300°C and 400°C.

[0049] The beneficial effect of the active fault-cutting gas discharge tube provided in the present embodiment is that: compared with the prior art, the active fault-cutting gas discharge tube provided in the present embodiment can not only discharge lightning current or overvoltage, but also protect other devices connected in parallel with the gas discharge tube; and when the lightning current or overvoltage is too large, resulting in excessive power frequency continuous current in the gas discharge tube or the duration is too long, when the temperature in the discharge cavity 400 gradually rises to the melting point of the low-temperature connecting part 320, the low-temperature connecting part 320 of the connecting member 300 will gradually melt, and an opening will be formed at the end of the first insulating tube body 100, so that gas exchange can be carried out inside and outside the discharge cavity 400, thereby cutting off the power frequency continuous current, avoiding the explosion of the gas discharge tube, and improving the gas discharge tube. and, since the melting point of the high-temperature connection part 310 in the connector 300 is higher than the melting point of the low-temperature connection part 320, after the temperature in the discharge chamber 400 reaches the melting point of the low-temperature connection part 320, the high-temperature connection part 310 will still not melt, and the connector 300 will not produce excessive molten droplets, which can prevent the molten droplets from splashing into the first insulating tube body 100 and causing a short circuit in the first insulating tube body 100, thereby improving the safety performance of the gas discharge tube. Moreover, since the high-temperature connection part 310 can still keep the two electrodes 200 connected to the first insulating tube body 100, it can also prevent the electrodes 200 from collapsing from the first insulating tube body 100 and causing an impact on external personnel or equipment, thereby further improving the safety performance of the gas discharge tube.

[0050] In addition, compared to using a connector 300 having only a low-temperature connector 320, the present embodiment uses a connector 300 having both a low-temperature connector 320 and a high-temperature connector 310. When the temperature of the discharge chamber 400 rises to the melting point of the low-temperature connector 320, the heat absorbed by the high-temperature connector 310 is only used to increase the temperature of the high-temperature connector 310, and no phase change occurs. The heat absorbed by the low-temperature connector 320 is used to change the phase state and increase the temperature. Compared with the high-temperature connector 310, the temperature of the low-temperature connector 320 rises more slowly. The heat of the discharge chamber 400 can be more easily transferred to the low-temperature connector 320 having a larger temperature difference than the temperature in the discharge chamber, thereby accelerating the melting of the low-temperature connector 320, so that the gas discharge tube can cut off the power frequency continuous current more quickly, with high sensitivity. The connector 300 is only provided with a low-temperature connecting part 320, and the low-temperature connecting part 320 uses a lot of materials and covers a wide area. When the low-temperature connecting part 320 melts, a large number of molten droplets will be formed, which can easily splash into the first insulating tube body 100 to form a short circuit, and even cause the two electrodes 200 to melt, affecting the fault failure response characteristics of the gas discharge tube.

[0051] Secondly, compared to using a connector 300 that only has a low-temperature connection part 320, the present embodiment provides a connector 300 that has both a low-temperature connection part 320 and a high-temperature connection part 310, which can be installed on a circuit board or other device by a card slot installation method. During installation, the high-temperature connection part 310 can be located at the bottom of the card slot and the low-temperature connection part 320 can be located at the top of the card slot based on the markings of the high-temperature connection part 310 and the low-temperature connection part 320 on the first insulating tube body 100, or by other methods. In this way, the high-temperature connection part 310 directly contacts the circuit board or other device, thereby preventing the low-temperature connection part 320 from melting due to heat, thereby damaging other devices such as the circuit board and causing the overvoltage protection device to fail.

[0052] Thirdly, compared with using a connector 300 having only a low-temperature connector 320, the present embodiment provides a connector 300 having both a low-temperature connector 320 and a high-temperature connector 310. The ratio of the area, volume, etc. of the low-temperature connector 320 to the high-temperature connector 310 can be adjusted to adapt to gas discharge tubes with different current carrying capacities, so that various types of gas discharge tubes have both suitable overvoltage protection capabilities and strong ability to interrupt power frequency continuous current, making the product have great value for promotion and application.

[0053] In another embodiment of the present application, the low-temperature connecting portion 320 is a combination of one or more of low-temperature solder, low-temperature adhesive or silica gel.

[0054] Specifically, when the low-temperature connection part 320 is installed between the corresponding electrode 200 and the first insulating tube body 100, one side of the low-temperature connection part 320 faces the inside of the discharge chamber 400, and the other side faces the outside of the discharge chamber 400. When the temperature in the discharge chamber 400 is higher than the melting point of the bottom connection part, the low-temperature connection part 320 absorbs heat and melts, deforms or softens, which can make the seal of the discharge chamber 400 ineffective. The low-temperature solder can be a tin-antimony-lead alloy solder with a melting point of 400°C, a lead solder with a melting point of 327°C, a zinc solder with a melting point of 420°C, etc. The melting point of the low-temperature solder can also be 227°C, 199°C, 382°C, etc., which is not limited to the only one. The low-temperature adhesive can also be an organic glue.

[0055] With the gas discharge tube of the above structure, the low temperature connection part 320 will melt when the temperature of the discharge cavity 400 is higher than the melting point, thereby making the sealing of the discharge cavity 400 invalid, and gas exchange can be carried out inside and outside the discharge cavity 400, thereby cutting off the power frequency continuous current.

[0056] In another embodiment of the present application, the high temperature connection part 310 is a high temperature solder. When the temperature of the discharge chamber 400 is higher than the melting point of the low temperature connection part 320, the high temperature solder can keep the corresponding electrode 200 and the first insulating tube body 100 connected, so as to prevent the electrode 200 from collapsing and causing damage to external personnel or equipment.

[0057] Specifically, the melting point temperature of the high temperature solder may be 700°C, 720°C, 730°C, 740°C, 760°C, 770°C, 780°C, 790°C, 800°C, etc., which is not limited here.

[0058] Optionally, the high temperature solder is copper-silver alloy solder.

[0059] In another embodiment of the present application, the connector 300 provided with the low-temperature connection part 320 includes at least two low-temperature connection parts 320 and at least two high-temperature connection parts 310, and the at least two low-temperature connection parts 320 and the at least two high-temperature connection parts 310 are alternately connected to form a ring. In this way, when the low-temperature connection part 320 melts, openings can be formed at different positions of the discharge cavity 400, which can avoid the need to ensure that the low-temperature connection part 320 is not blocked by other structures outside the gas discharge tube when only a single low-temperature connection part 320 is provided, which limits the installation method and orientation of the gas discharge tube and increases the difficulty of installing the gas discharge tube.

[0060] In another embodiment of the present application, please refer to Figure 2 The discharge surface 210 of the electrode 200 is a convex surface, which can cause gap discharge in the middle of the two electrodes 200, that is, the part where the distance between the two electrodes 200 is shorter, thereby avoiding damage to the first insulating tube body 100.

[0061] In another embodiment of the present application, the discharge surface 210 of the electrode 200 is a plane (not shown in the figure, the discharge surface 210 of the electrode 200 shown in the figure is a convex surface). Compared with the electrode 200 with a convex discharge surface 210, the electrode 200 with a flat discharge surface 210, when discharge occurs on the discharge surface 210, the heat generated is directly transferred to the peripheral connector 300 through the plane, the heat conduction distance is shorter, the low-temperature connection part 320 melts faster, and the end of the discharge cavity 400 opens faster, thereby being able to cut off the power frequency continuous current faster, ensuring the safety of the gas discharge tube.

[0062] In another embodiment of the present application, please refer to Figure 1 , Figure 2 and Figure 4 The active fault-cutting gas discharge tube also includes a second insulating tube body 500, which is sleeved on the outer periphery of the first insulating tube body 100 and spaced apart from the first insulating tube body 100, and the two ends of the second insulating tube body 500 are respectively sealed and connected to the two electrodes 200, and the second insulating tube body 500, the first insulating tube body 100 and the two electrodes 200 together form a gas containing cavity 600.

[0063] Specifically, the second insulating tube body 500 may be a ceramic tube body, a glass tube body, etc., and may be configured as required, and is not limited here.

[0064] When the gas discharge tube is in use, it is usually filled with glue on the outside to improve the moisture-proof, dust-proof, insulating, and sealing properties of the device. The gas discharge tube provided in this embodiment forms a gas containing chamber 600 on the periphery of the discharge chamber 400 by providing a second insulating tube body 500, so that the inert gas in the discharge chamber 400 can still be exchanged with the gas in the gas containing chamber 600 when it is wrapped by the glue and cannot exchange gas with the external air, thereby realizing the interruption of the power frequency continuous current, and making the application range of the gas discharge tube wider.

[0065] In addition, the gas discharge tube provided with the second insulating tube body 500 has its electrode 200 still kept outside, and the electrode 200 can be directly connected to a circuit board and other structures through a lead, avoiding the need to set the electrode 200 inside the gas discharge tube and requiring the gas discharge tube shell and other structures to be opened, thereby simplifying the manufacturing process of the gas discharge tube components.

[0066] Optionally, a high temperature resistant sealant layer 700 is provided between the second insulating tube body 500 and the corresponding electrode 200, and the high temperature resistant sealant layer 700 is used to connect the corresponding electrode 200 to the second insulating tube body 500. The high temperature resistant sealant layer 700 is not easily deformed or melted when heated, thereby ensuring the reliability of the connection between the second insulating tube body 500 and the electrode 200.

[0067] In another embodiment of the present application, please refer to Figure 3 and Figure 4 The gas containing chamber 600 is used to contain inert gas and / or air.

[0068] Specifically, the gas in the gas containing chamber 600 may be air, argon, neon, etc., and may be set as required.

[0069] It should be noted that the gas in the gas containing chamber 600 is mainly used for gas exchange with the inert gas in the discharge chamber 400 to cut off the industrial frequency continuous current in the discharge chamber 400. Therefore, we do not want the gas in the gas containing chamber 600 to be broken down, but require the gas in the gas containing chamber 600 to have a higher insulation strength. When the type of gas in the gas containing chamber 600, the gap width between the two electrodes 200 and other factors are determined, the breakdown pressure of the gas first decreases and then increases with the increase of the gas pressure. Therefore, the gas pressure of the gas type in the gas discharge tube can be set to avoid the overvoltage applied to the two electrodes 200 from breaking down the gas in the gas containing chamber 600. The gas type and the gas pressure are not limited here.

[0070] Optionally, the gas containing chamber 600 may be filled with high-pressure air, negative-pressure air, high-pressure inert gas, etc. to improve the gas insulation strength, or may be filled with normal-pressure air to save production costs.

[0071] In another embodiment of the present application, please refer to Figure 2 The electrode 200 is formed in one piece from a conductive material, which can simplify the production process of the gas discharge tube and reduce the manufacturing cost.

[0072] In another embodiment of the present application, the electrode 200 includes a conductive portion (not shown) and an insulating portion (not shown) connected to each other. The conductive portion covers the end of the first insulating tube body 100 and is used to enclose the discharge cavity 400 with the first insulating tube body 100. The insulating portion is arranged around the outer circumference of the conductive portion and is used to enclose the gas containing cavity 600 with the first insulating tube body 100 and the second insulating tube body 500.

[0073] Specifically, the conductive part and the insulating part of the electrode 200 may be sealed and connected by glue connection, snap connection, etc., which is not limited here.

[0074] In the gas discharge tube adopting the above structure, both ends of the gas accommodating chamber 600 are insulating parts, and gap discharge is not easy to occur in the gas accommodating chamber 600. In this way, the gas in the gas accommodating chamber 600 can always play a role in blocking the power frequency continuous current when the power frequency continuous current in the discharge chamber 400 is too large or lasts too long, so that the reliability of the gas discharge tube is good.

[0075] This embodiment further provides an overvoltage protection device (not shown), which includes the above-mentioned active fault-cutting gas discharge tube.

[0076] Since the above-mentioned overvoltage protection device adopts all the above-mentioned embodiments of actively cutting off the faulty gas discharge tube, it has at least all the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0077] See also Figure 1 and Figure 2 This embodiment also provides a method for preparing a gas discharge tube with an active fault removal function. The method is used to prepare the above-mentioned gas discharge tube with an active fault removal function. The method comprises:

[0078] Prepare materials: prepare two electrodes 200, two connectors 300 and a first insulating tube body 100, wherein the discharge surfaces 210 of the two electrodes 200 are coated with electron emission materials, the two connectors 300 each include a high-temperature connector 310, and at least one of the two connectors 300 includes a high-temperature connector 310 and a low-temperature connector 320, and the melting point of the high-temperature connector 310 is higher than the melting point of the low-temperature connector 320;

[0079] Assembly: two electrodes 200 are respectively arranged at two ends of the first insulating tube body 100, and each connecting piece 300 is clamped between the corresponding electrode 200 and the first insulating tube body 100;

[0080] Welding: In an inert gas environment, a welding furnace is used to melt each connecting piece 300 and then the corresponding electrode 200 is fixedly connected to the first insulating tube body 100 .

[0081] The method for preparing the active fault-cutting gas discharge tube provided in this embodiment has simple production and assembly processes and low manufacturing cost. The prepared gas discharge tube has a strong ability to interrupt power frequency continuous current.

[0082] In another embodiment of the present application, the steps of preparing two connecting members 300 include:

[0083] An annular high temperature connection portion 310 is prepared, and a low temperature connection portion 320 is formed in a predetermined range on the surface of the annular high temperature connection portion 310 by vapor deposition.

[0084] In this embodiment, the connector 300 is prepared by a vapor deposition method, which has a simple process, improves the environment, is pollution-free, requires less consumables, forms a uniform and dense film, has a strong bonding force between the high-temperature connecting part 310 and the low-temperature connecting part 320, and has good structural strength of the connector 300.

[0085] In another embodiment of the present application, the steps of preparing two connecting members 300 include:

[0086] The high temperature connection part 310 and the low temperature connection part 320 are cast in sections to form the connection member 300 .

[0087] The connector 300 is prepared by a segmented casting method, and the internal stress of the connector 300 is small and the production cost is low.

[0088] Furthermore, the above-mentioned method for preparing the active fault-cutting gas discharge tube further includes preparing a second insulating tube body 500 in the step of preparing materials;

[0089] The assembly step also includes sleeve-arranging the second insulating tube body 500 on the outer periphery of the first insulating tube body 100 and spacing the second insulating tube body 500 from the first insulating tube body 100;

[0090] After the welding step, the method further includes coating a high temperature resistant sealant layer 700 at the interface between the two electrodes 200 and the second insulating tube body 500 in an inert gas environment or an air environment, so that both ends of the second insulating tube body 500 are sealed and connected to the two electrodes 200 respectively.

[0091] Specifically, the pressure of the inert gas environment and the air environment can be set as needed, and is not limited here.

[0092] In the method for preparing a gas discharge tube with active fault removal provided in the present embodiment, the second insulating tube body 500 is sleeved on the outer periphery of the first insulating tube body 100 before the welding step, and after the welding step, the second insulating tube body 500 and the electrode 200 are fixedly connected by using a high temperature resistant sealant layer 700, so that the production and assembly process of the gas discharge tube is simple and the manufacturing efficiency is high. The prepared gas discharge tube not only has a strong ability to cut off the power frequency continuous current, but also has a good ability to cut off the power frequency continuous current even if the gas discharge tube is filled with glue.

[0093] In order to more clearly illustrate the principle of the present application, this embodiment also provides a gas discharge tube, see Figure 2The gas discharge tube comprises a first insulating tube body 100, two electrodes 200 and two connecting pieces 300. The two electrodes 200 are respectively arranged at two ends of the first insulating tube body 100 and enclose the first insulating tube body 100 to form a discharge cavity 400. The surfaces of the two electrodes 200 facing the discharge cavity 400 form a discharge surface 210. Each connecting piece 300 is sandwiched between the corresponding electrode 200 and the first insulating tube body 100, and is used to seal and connect the corresponding electrode 200 to the first insulating tube body 100. One of the two connecting pieces 300 is provided with a high-temperature connecting part 310, and the other of the two connecting pieces 300 is provided with a high-temperature connecting part 310 and a low-temperature connecting part 320, and the low-temperature connecting part 320 is connected to the high-temperature connecting part 310 end to end to form a ring, wherein the high-temperature connecting part 310 adopts a copper-silver alloy solder with a melting point of 750°C, and the low-temperature connecting part 320 adopts a zinc solder with a melting point of 420°C, and the DC breakdown voltage of the gas discharge tube is 600V.

[0094] A fault failure response characteristic test was performed on the gas discharge tube having the above structure.

[0095] 1. Test Principle

[0096] The test principle diagram is as follows Figure 5 As shown, the combination wave generator is a 1.2 / 50μs and 8 / 20μs combination wave generator; the sampling resistor R is a 100W inductive cement resistor with a resistance of 2Ω and an inductance of about 10mH. The cement resistor has the advantages of shock resistance, moisture resistance, heat resistance, good heat dissipation, low price, etc. Its explosion-proof performance is also good and can play a protective role.

[0097] 2. Experimental plan

[0098] A 1.2 / 50μs and 8 / 20μs combination wave generator was used to simulate lightning overvoltage for impulse test. A gas discharge tube was selected to receive an 8 / 20μs pulse current impulse with an amplitude of 2KA, and the voltage waveforms on both sides of the sampling resistor were recorded.

[0099] 3. Analysis of test results

[0100] When the DC regulated power supply is set to 6.5A, 40V, the gas discharge tube can withstand the current pulse impact. At this time, the gas discharge tube will have an arc phenomenon, generate power frequency continuous current and short circuit fault. The voltage waveform of the sampling resistor captured by the oscilloscope is as follows: Figure 6As shown. The waveform vibrates greatly and the disturbance is large. It can be seen from the waveform that when the gas discharge tube is broken down and generates power frequency continuous current, the series circuit of the sampling resistor and the gas discharge tube forms a path, and the voltage drop of the sampling resistor instantly rises to 14V. When the gas discharge tube receives the open-circuit response of the power frequency continuous current fault, the series circuit of the sampling resistor and the gas discharge tube forms an open circuit, and the voltage drop of the sampling resistor instantly becomes 0V. Therefore, the time between the sampling resistor voltage drop of 14V-0V is the gas discharge tube fault failure response time, and the gas discharge tube fault failure response time is about 7s.

[0101] It can be seen that the fault failure response characteristic test of the gas discharge tube having the above structure has a good effect, and the gas discharge tube has a good fault failure response characteristic.

[0102] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A gas discharge tube with active fault removal, characterized in that: The active fault-cutting gas discharge tube comprises: A first insulating tube body; Two electrodes, the two electrodes are respectively arranged at two ends of the first insulating tube body, and together with the first insulating tube body, form a discharge cavity, and the surfaces of the two electrodes facing the discharge cavity form a discharge surface; the area of ​​the surface of the electrode close to the first insulating tube body is larger than the end surface area of ​​the first insulating tube body, one end of the first insulating tube body is connected to the middle of the surface of one of the electrodes close to the first insulating tube body, and the other end of the first insulating tube body is connected to the middle of the surface of the other electrode close to the first insulating tube body; and Two connecting pieces, each of which is clamped between the corresponding electrode and the first insulating tube body, and is used to seal and connect the corresponding electrode to the first insulating tube body. Both of the connecting pieces are provided with a high-temperature connecting part, and at least one of the two connecting pieces is also provided with a low-temperature connecting part. The low-temperature connecting part is connected end to end with the corresponding high-temperature connecting part to form a ring, and the melting point of the low-temperature connecting part is lower than the melting point of the high-temperature connecting part.

2. The active fault-cutting gas discharge tube according to claim 1, characterized in that: The low-temperature connection part is a combination of one or more of low-temperature solder, low-temperature adhesive or silica gel; and / or the high-temperature connection part is high-temperature solder.

3. The active fault-cutting gas discharge tube according to claim 1, characterized in that: The discharge surface of the electrode is a flat surface or a convex surface.

4. The active fault-cutting gas discharge tube according to claim 1, characterized in that: The active fault-cutting gas discharge tube also includes a second insulating tube body, which is sleeved on the periphery of the first insulating tube body and spaced apart from the first insulating tube body, and both ends of the second insulating tube body are respectively sealed and connected to the two electrodes, and the second insulating tube body, the first insulating tube body and the two electrodes together form a gas containing cavity.

5. The active fault-cutting gas discharge tube according to claim 4, characterized in that: The gas containing chamber is used to contain inert gas and / or air.

6. The active fault-cutting gas discharge tube according to claim 4, characterized in that: The electrodes are formed in one piece from a conductive material; Alternatively, the electrode includes a conductive part and an insulating part that are connected to each other, the conductive part covers the end of the first insulating tube body and is used to enclose the discharge cavity together with the first insulating tube body, and the insulating part is arranged around the outer circumference of the conductive part and is used to enclose the first insulating tube body and the second insulating tube body to form the gas containing cavity.

7. An overvoltage protection device, characterized in that: The overvoltage protection device comprises the active fault-cutting gas discharge tube according to any one of claims 1 to 6.

8. A method for preparing a gas discharge tube capable of automatically removing a faulty gas discharge tube, characterized in that: The method is used to prepare the active fault-cutting gas discharge tube according to claim 1, and the method comprises: Prepare materials: prepare the two electrodes, the two connecting pieces and the first insulating tube; Assembly: The two electrodes are respectively arranged at two ends of the first insulating tube body, and each connecting piece is clamped between the corresponding electrode and the first insulating tube body; Welding: In an inert gas environment, a welding furnace is used to melt each of the connecting parts and then the corresponding electrode is fixedly connected to the first insulating tube body.

9. The method for preparing a gas discharge tube capable of automatically removing a fault according to claim 8, characterized in that: The steps of preparing the two connecting pieces include: Preparing an annular high-temperature connection portion, and forming the low-temperature connection portion by vapor deposition within a predetermined range on the surface of the annular high-temperature connection portion; Alternatively, the high-temperature connecting part and the low-temperature connecting part are cast in sections to form the connecting piece.

10. The method for preparing a gas discharge tube with active fault removal according to claim 8, characterized in that: The step of preparing materials also includes preparing a second insulating tube body; The assembling step further includes sleeve-arranging the second insulating tube body on the outer circumference of the first insulating tube body and arranging the second insulating tube body spaced apart from the first insulating tube body; After the welding step, the method further includes coating a high temperature resistant sealant layer at the interface between the two electrodes and the second insulating tube body in an inert gas environment or an air environment, so that the two ends of the second insulating tube body are respectively sealed and connected to the two electrodes.

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