A gas discharge tube and overvoltage protection device

Abstract

The embodiment of the present invention discloses a gas discharge tube and an overvoltage protection device. The gas discharge tube includes: a tubular electrode; an insulating component, the tube mouth of the tubular electrode and the insulating component are sealed and connected by solder to form a discharge cavity, and the discharge cavity is filled with discharge gas; at least two inner electrodes are arranged at intervals, located in the discharge cavity, and the inner electrode and the tubular electrode are arranged at intervals; the surface of the inner electrode close to the inner surface of the tubular electrode adjacent to the tubular electrode is parallel and opposite to the part of the inner surface of the tubular electrode to form a first discharge gap; the opposite surfaces of two adjacent inner electrodes are parallel to form a second discharge gap, and the extension direction of the tubular electrode is parallel to the opposite surfaces of the two adjacent inner electrodes. The technical solution provided by the embodiment of the present invention can easily increase the flow rate by increasing the height of the gas discharge tube without re-opening the mold, and the size relationship of each discharge gap can be conveniently and freely adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of overvoltage protection, and in particular to a gas discharge tube and an overvoltage protection device. Background Art

[0002] Lightning and instantaneous overvoltages in large electrical equipment can invade indoor electrical equipment and network equipment through power supplies, antennas, radio signal transceivers and other lines, causing damage to equipment or components, casualties, interference or loss of transmitted or stored data, and even causing electronic equipment to malfunction or temporarily fail, system pauses, data transmission interruptions, and damage to local area networks and even wide area networks. Therefore, overvoltage protection devices need to be installed in electronic equipment.

[0003] The three-electrode gas discharge tube is a switching type protection device, usually used as an overvoltage protection device. Figure 1 The cross-sectional structure diagram of a triode gas discharge tube in the prior art. The existing triode gas discharge tube comprises an upper electrode 101, a first porcelain tube 104, an intermediate electrode 102, a second porcelain tube 105 and a lower electrode 103 which are sequentially sealed and connected by solder to form a discharge cavity. A through hole 106 is provided on the intermediate electrode 102. The surface opposite to the upper electrode 101 and the lower electrode 103 is a discharge surface. In order to increase the flow rate of the existing triode gas discharge tube, it is necessary to increase the discharge surface of the upper electrode 101 and the lower electrode 103, that is, to increase the diameter of the upper electrode 101, the intermediate electrode 102 and the lower electrode 103, so it is necessary to re-open the mold of the end electrode, the porcelain tube, the solder and the intermediate electrode, resulting in a complicated manufacturing process and high manufacturing cost. In addition, the size of the discharge gap between the upper electrode 101 and the middle electrode 102 is D3, the size of the discharge gap between the lower electrode 103 and the middle electrode 102 is D4, and the size of the discharge gap between the upper electrode 101 and the lower electrode 103 is D5. D5 is always greater than D3, and D5 is always greater than D4. Adjusting the size of D3 or D4 will affect D5, so the size relationship of the discharge gaps between the electrodes is limited and it is not convenient to adjust freely. Summary of the invention

[0004] The embodiments of the present invention provide a gas discharge tube and an overvoltage protection device, which are convenient for increasing the height of the gas discharge tube to increase the discharge surface area of ​​each electrode of the gas discharge tube, thereby increasing the flow rate of the gas discharge tube. Since there is no need to re-open the mold when increasing the height of the gas discharge tube, the complexity of the manufacturing process can be reduced and the manufacturing cost can be reduced. In addition, the discharge gaps between the electrodes are independent of each other, and the size relationship of the discharge gaps between the electrodes can be freely adjusted.

[0005] In a first aspect, an embodiment of the present invention provides a gas discharge tube, comprising:

[0006] Tubular electrodes;

[0007] The insulating component, the tube mouth of the tubular electrode and the insulating component are sealed and connected by solder to form a discharge cavity, and the discharge cavity is filled with a discharge gas;

[0008] At least two inner electrodes are spaced apart and located in the discharge cavity, wherein the inner electrodes are spaced apart from the tubular electrode;

[0009] The surface of the inner electrode adjacent to the inner surface of the tubular electrode is parallel to and opposite to a portion of the inner surface of the tubular electrode to form a first discharge gap;

[0010] The opposing surfaces of two adjacent inner electrodes are parallel to form a second discharge gap. The extending direction of the tubular electrode is parallel to the opposing surfaces of the two adjacent inner electrodes. The first discharge gap and the second discharge gap are located in the accommodation space of the tubular electrode.

[0011] Furthermore, the circumference of the cross section of the tubular electrode is circular, and the inner electrodes are arranged along the circumference direction of the cross section of the tubular electrode; or, the inner electrodes are arranged in multiple circles in an encircling manner along the radius direction of the cross section of the tubular electrode, the number of inner electrodes in each circle is the same, and the number of inner electrodes in each circle is greater than or equal to 2.

[0012] Furthermore, the inner electrode is a column with a fan-shaped cross section.

[0013] Furthermore, the number of the inner electrodes is 2, and the inner electrodes are cylinders with a semicircular cross section.

[0014] Furthermore, the perimeter of the cross section of the tubular electrode is rectangular, the inner electrodes are arranged in a row or in a matrix, the number of rows in the matrix arrangement is greater than or equal to 2, and the number of columns in the matrix arrangement is greater than or equal to 2.

[0015] Furthermore, the inner electrode is a rectangular parallelepiped.

[0016] Furthermore, the first discharge gap is larger than the second discharge gap.

[0017] Furthermore, the number of the internal electrodes is at least 3, and the internal electrodes are arranged at equal intervals.

[0018] Further, two adjacent internal electrodes are not electrically connected, but are electrically connected to an internal electrode adjacent to the same internal electrode.

[0019] Furthermore, the number of the inner electrodes is an even number greater than or equal to four.

[0020] Furthermore, the first discharge gaps between each inner electrode close to the inner surface of the tubular electrode and the tubular electrode are equal.

[0021] Furthermore, the inner electrode is provided with pins, and the pins of all the inner electrodes pass through the insulating component on the same tube opening of the tubular electrode and extend to the outside of the discharge cavity.

[0022] In a second aspect, an embodiment of the present invention further provides an overvoltage protection device, comprising: a gas discharge tube provided in any embodiment of the present invention, wherein the tubular electrode is electrically connected to the ground, and at least two inner electrodes are electrically connected to at least two AC power supply lines.

[0023] Furthermore, the number of inner electrodes is 2, the number of AC power supply lines is 2; the overvoltage protection device further includes a first voltage-limiting surge protection device, a second voltage-limiting surge protection device and a third voltage-limiting surge protection device,

[0024] An inner electrode is electrically connected to an AC power supply line via a first voltage-limiting surge protection device;

[0025] Another inner electrode is electrically connected to another AC power supply line via a second voltage-limiting surge protection device;

[0026] The tubular electrode is electrically connected to the ground via a third voltage-limiting surge protection device.

[0027] In the technical solution of the embodiment of the present invention, the gas discharge tube includes a tubular electrode, an insulating component and at least two inner electrodes, wherein the tube mouth of the tubular electrode is sealed and connected with the insulating component by solder to form a discharge cavity, and the discharge cavity is filled with discharge gas; at least two inner electrodes are arranged at intervals, located in the discharge cavity, and the inner electrode and the tubular electrode are arranged at intervals; the surface of the inner electrode close to the inner surface of the tubular electrode adjacent to the tubular electrode is parallel and opposite to the inner surface of the tubular electrode to form a first discharge gap; the opposite surfaces of two adjacent inner electrodes are parallel to form a second discharge gap, and the tubular electrode The extending direction is parallel to the opposite surfaces of two adjacent inner electrodes, the first discharge gap and the second discharge gap are located in the accommodating space of the tubular electrode, and the discharge surface of each electrode is parallel to the height direction of the gas discharge tube, so it is convenient to increase the discharge surface area of ​​each electrode of the gas discharge tube by increasing the height of the gas discharge tube, thereby increasing the flow rate of the gas discharge tube. Since there is no need to re-open the mold when increasing the height of the gas discharge tube, the complexity of the manufacturing process can be reduced and the manufacturing cost can be reduced. In addition, the discharge gaps between the electrodes are independent of each other, and the size relationship of the discharge gaps between the electrodes can be freely adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of a triode gas discharge tube in the prior art;

[0029] Figure 2 A schematic diagram of the structure of a gas discharge tube provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of an explosion structure of a gas discharge tube provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the structure of a gas discharge tube provided by an embodiment of the present invention when an insulating upper cover is not welded;

[0032] Figure 5 A schematic diagram of a top view of a gas discharge tube provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the side structure of a gas discharge tube provided by an embodiment of the present invention;

[0034] Figure 7 A schematic cross-sectional structure diagram of a gas discharge tube provided by an embodiment of the present invention;

[0035] Figure 8 For Figure 7 Schematic diagram of the equivalent circuit structure of the corresponding gas discharge tube;

[0036] Fig. 9 A schematic diagram of the structure of a voltage protection device provided by an embodiment of the present invention;

[0037] Fig.10 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention;

[0038] Fig.11 A schematic cross-sectional structure diagram of another gas discharge tube provided by an embodiment of the present invention;

[0039] Fig.12 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention;

[0040] Fig.13 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention;

[0041] Fig.14 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention;

[0042] Fig.15 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention;

[0043] Fig.16 A schematic cross-sectional structure diagram of another gas discharge tube provided by an embodiment of the present invention;

[0044] Fig.17 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention;

[0045] Fig.18 A schematic structural diagram of yet another voltage protection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] 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.

[0047] An embodiment of the present invention provides a gas discharge tube. Figure 2 A schematic structural diagram of a gas discharge tube provided in an embodiment of the present invention. Figure 3 A schematic diagram of the explosion structure of a gas discharge tube provided by an embodiment of the present invention. Figure 4 A schematic structural diagram of a gas discharge tube provided by an embodiment of the present invention when an insulating upper cover is not welded thereon. Figure 5 A schematic top view of the structure of a gas discharge tube provided by an embodiment of the present invention. Figure 6 A schematic side view of the structure of a gas discharge tube provided by an embodiment of the present invention. Figure 7 A schematic cross-sectional structure diagram of a gas discharge tube provided in an embodiment of the present invention. Figure 8 For Figure 7 Schematic diagram of the equivalent circuit structure of the corresponding gas discharge tube. Fig. 9 A schematic diagram of the structure of a voltage protection device provided by an embodiment of the present invention. Figures 2 to 9 As shown, the gas discharge tube 1 comprises: a tubular electrode 10 , an insulating component 20 and at least two inner electrodes 30 .

[0048] Among them, the tube mouth of the tubular electrode 10 is sealed and connected to the insulating component 20 by solder 50 to form a discharge cavity 40, and the discharge cavity 40 is filled with discharge gas; at least two inner electrodes 30 arranged at intervals are located in the discharge cavity 40, and the inner electrode 30 is arranged at intervals from the tubular electrode 10; the surface of the inner electrode 30 adjacent to the inner surface of the tubular electrode 10 is parallel to and opposite to a part of the inner surface of the tubular electrode 10 to form a first discharge gap 31; the opposite surfaces of two adjacent inner electrodes 30 are parallel to form a second discharge gap 32, the extension direction O5O6 of the tubular electrode 10 is parallel to the opposite surfaces of the two adjacent inner electrodes 30, and the first discharge gap 31 and the second discharge gap 32 are located in the accommodating space of the tubular electrode 10.

[0049] Among them, the perimeter of the cross section of the tubular electrode 10 can be a triangle, etc., which is not limited in the embodiment of the present invention. Optionally, the perimeter of the cross section of the tubular electrode 10 is circular or rectangular. The tubular electrode 10 may include at least one of the following materials: oxygen-free copper, iron-nickel alloy, and tungsten-copper alloy. The discharge gas may include at least one of the following gases: an inert gas (for example, helium, argon, krypton, xenon, radon), nitrogen, and hydrogen. The insulating component 20 may include one of the following materials: ceramics and glass. The inner electrode 30 may include at least one of the following materials: oxygen-free copper, iron-nickel alloy, and tungsten-copper alloy. The materials of the tubular electrode 10 and the inner electrode 30 are the same or different. At least two inner electrodes 30 may be arranged in one or more rows. At least two inner electrodes 30 may be arranged in an array. The inner electrode 30 may be columnar. The extension direction of the inner electrode 30 may be parallel to the extension direction O5O6 of the tubular electrode 10. The extension direction O5O6 of the tubular electrode 10 is parallel to the height direction of the gas discharge tube 1. Figure 7 For gas discharge tube Figure 5 Schematic diagram of the cross-sectional structure along the AB direction. Figures 2 to 7 The circumference of the cross section of the tubular electrode 10 is drawn as an example, and there are two inner electrodes 30, and the inner electrode 30 is a columnar cross section with a fan-shaped cross section. Among them, the two inner electrodes 30 are respectively a first inner electrode 30-1 and a second inner electrode 30-2, and the surface of the first inner electrode 30-1 adjacent to the tubular electrode 10 is parallel to and opposite to the first part 11-1 of the inner surface of the tubular electrode 10 to form a first discharge gap 31-1. The surface of the second inner electrode 30-2 adjacent to the tubular electrode 10 is parallel to and opposite to the second part 11-2 of the inner surface of the tubular electrode 10 to form a first discharge gap 31-2. The tubular electrode 10 may be provided with a pin 35-1, the first inner electrode 30-1 may be provided with a pin 35-2, and the second inner electrode 30-2 may be provided with a pin 30-3. Among the inner electrodes 30 near the inner surface of the tubular electrode 10, the surfaces of different inner electrodes 30 adjacent to the tubular electrode 10 are parallel and opposite to different parts of the inner surface of the tubular electrode 10 adjacent to the discharge inner cavity 40. The opposing surfaces of the first inner electrode 30-1 and the second inner electrode 30-2 are parallel to form a second discharge gap 32. The tubular electrode 10 can be electrically connected to the ground PE through its pin 35-1. The first inner electrode 30-1 can be electrically connected to a power supply line through its pin 35-2, for example, it can be a live line L. The second inner electrode 30-2 can be electrically connected to another power supply line through its pin 35-3, for example, it can be a neutral line N.

[0050] The inner electrode 30 may be provided with a pin 35. The tubular electrode 10 may have two tube openings, and any tube opening may be sealed and connected to an insulating component 20, that is, the two insulating components 20 are an insulating base and an insulating upper cover, respectively. One tube opening of the tubular electrode 10 is sealed and connected to the insulating base, and the other tube opening is sealed and connected to the insulating upper cover. The pin 35 of any inner electrode 30 may pass through the insulating component 20 on any tube opening of the tubular electrode 10 and extend to the outside of the discharge cavity 40, so as to facilitate the gas discharge tube 1 to be welded to the printed circuit board through the pin 35. The pins 35 of a part of the inner electrode 30 may pass through the insulating component 20 on one tube opening of the tubular electrode 10 and extend to the outside of the discharge cavity 40, and the pins 35 of the other part of the inner electrode 30 may pass through the insulating component 20 on the other tube opening of the tubular electrode 10 and extend to the outside of the discharge cavity 40.

[0051] In the inner electrode 30 close to the inner surface of the tubular electrode 10, the first discharge gap 31 between each inner electrode 30 and the tubular electrode 10 can be equal or unequal. For example, the first discharge gap 31-1 and the first discharge gap 31-2 can be equal or unequal, and can be freely adjusted and set as needed, which is not limited in the embodiment of the present invention. The size of the first discharge gap 31 is D1, and the size of the second discharge gap 32 is D2. The size relationship between D1 and D2 can be freely adjusted and set as needed, which is not limited in the embodiment of the present invention. For example, D1 is less than or equal to D2. The discharge gaps between the electrodes are independent of each other, and the size relationship between the discharge gaps between the electrodes can be freely adjusted.

[0052] Working principle: When the voltage between the tubular electrode 10 and any inner electrode 30 close to the inner surface of the tubular electrode 10 reaches the turn-on voltage, the first discharge gap 31 between the inner electrode 30 and the tubular electrode 10 starts to discharge, forming a conductive state to protect the device connected between the tubular electrode 10 and the inner electrode 30. When the voltage between the two inner electrodes 30 reaches its turn-on voltage, the second discharge gap 32 between the two inner electrodes 30 starts to discharge, forming a conductive state to protect the device connected between the two inner electrodes 30.

[0053] The surface of the inner electrode 30 close to the inner surface of the tubular electrode 10, the inner surface of the tubular electrode 10 close to the discharge inner cavity 40, and the surfaces facing each other of two adjacent inner electrodes 30 are discharge surfaces. The discharge surface of the tubular electrode 10 is parallel to the height direction of the gas discharge tube 1, and the discharge surfaces of the inner electrode 30 are parallel to the height direction of the gas discharge tube 1, that is, the discharge surfaces of each electrode are parallel to the height direction of the gas discharge tube 1, so it is convenient to increase the area of ​​the discharge surface of each electrode of the gas discharge tube by increasing the height of the gas discharge tube, thereby increasing the flow rate between each electrode of the gas discharge tube. Since there is no need to re-open the mold when increasing the height of the gas discharge tube, the complexity of the manufacturing process can be reduced and the manufacturing cost can be reduced. For example, if the current capacity needs to be increased, for example, from 10KA to 20KA, it is only necessary to double the length of the tubular electrode 10 along the extension direction O5O6 and the height of the inner electrode 30 along the extension direction O5O6. There is no need to change the size or diameter of the cross section of the tubular electrode 10 and the inner electrode 30, and all raw materials do not need to be re-molded, for example: the insulating base, the insulating cover, and the solder do not need to be changed, and the tubular electrode 10 and the inner electrode 30 do not need to be re-molded.

[0054] In the technical solution of this embodiment, the gas discharge tube includes a tubular electrode, an insulating component and at least two inner electrodes, wherein the tube mouth of the tubular electrode is sealed and connected with the insulating component by solder to form a discharge inner cavity, and the discharge inner cavity is filled with discharge gas; at least two inner electrodes are arranged at intervals and are located in the discharge inner cavity, and the inner electrode and the tubular electrode are arranged at intervals; the surface of the inner electrode close to the inner surface of the tubular electrode adjacent to the tubular electrode is parallel and opposite to a part of the inner surface of the tubular electrode to form a first discharge gap; the opposite surfaces of two adjacent inner electrodes are parallel to form a second discharge gap, and the extension direction of the tubular electrode is parallel to the opposite surfaces of the two adjacent inner electrodes. The first discharge gap and the second discharge gap are located in the accommodating space of the tubular electrode. The discharge surface of each electrode is parallel to the height direction of the gas discharge tube, so it is convenient to increase the discharge surface area of ​​each electrode of the gas discharge tube by increasing the height of the gas discharge tube, thereby increasing the flow rate of the gas discharge tube. Since there is no need to re-open the mold when increasing the height of the gas discharge tube, the complexity of the manufacturing process can be reduced and the manufacturing cost can be reduced. In addition, the discharge gaps between the electrodes are independent of each other, and the size relationship of the discharge gaps between the electrodes can be freely adjusted.

[0055] Optionally, based on the above embodiment, continue to refer to Figures 2 to 9 , the first discharge gap 31 between each inner electrode 30 close to the inner surface of the tubular electrode 10 and the tubular electrode 10 is equal. That is, all D1 are equal. For example, continue to refer to Figures 2 to 9, a first discharge gap 31 - 1 formed between the first inner electrode 30 - 1 and the tubular electrode 10 is equal to a first discharge gap 31 - 2 formed between the second inner electrode 30 - 2 and the tubular electrode 10 .

[0056] Optionally, based on the above embodiment, continue to refer to Figures 2 to 9 , the first discharge gap 31 is greater than the second discharge gap 32, that is, D1 is greater than D2. The tubular electrode 10 is electrically connected to the ground PE through its pin 35-1, the first inner electrode 30-1 is electrically connected to the live wire L through its pin 35-2, and the second inner electrode 30-2 is electrically connected to the neutral wire N through its pin 35-3. The first discharge gap 31-1 is equal to the first discharge gap 31-2, and D1 is greater than D2, so that the opening voltage of the first discharge gap 31-1 between the ground wire and the live wire is equal to the opening voltage of the first discharge gap 31-2 between the ground wire and the neutral wire N, and the opening voltage of the discharge gap 31-1 between the ground wire and the live wire L is greater than the opening voltage of the second discharge gap 32 between the live wire L and the neutral wire N, thereby avoiding the grounding resistance after the ground wire is grounded, and it is easy to form a ground potential counterattack to cause the discharge gap between the ground wire and the live wire and the discharge gap between the ground wire and the neutral wire to break down.

[0057] Optionally, based on the above embodiment, Fig.10 A schematic top view of another gas discharge tube provided in an embodiment of the present invention is shown. Fig.11 This is a schematic cross-sectional structure diagram of another gas discharge tube provided by an embodiment of the present invention, wherein the number of the inner electrodes 30 is greater than or equal to three.

[0058] in, Fig.11 For gas discharge tube Fig.10 Schematic diagram of the cross-sectional structure along the AB direction. Fig.10 and Fig.11 The circumference of the cross section of the tubular electrode 10 is drawn as an example, the number of the inner electrodes 30 is 3, the inner electrodes 30 are arranged in a row, and the inner electrodes 30 are rectangular. The second discharge gaps 32 between the inner electrodes 30 can be equal or unequal, and the size relationship of the second discharge gaps 32 between the inner electrodes 30 can be set as needed, which is not limited in the embodiment of the present invention. The number of the inner electrodes 30 can be set as needed, which is not limited in the embodiment of the present invention.

[0059] Optionally, based on the above embodiment, continue to refer to Fig.11 One end of the tubular electrode 10 may be a blind end, and the other end may be a tube mouth end, which is sealed and connected to an insulating component 20. An insulating component 20 may be provided inside the blind end of the tubular electrode 10 to prevent the inner electrode 30 from short-circuiting with the tubular electrode 10.

[0060] Optionally, based on the above embodiment, continue to refer to Fig.10 and Fig.11 , the inner electrodes 30 are arranged at equal intervals. The second discharge gaps 32 between any two adjacent inner electrodes 30 are equal, that is, all D2 are equal. For example, continue to refer to Fig.10 and Fig.11 , the size of the second discharge gap 32 between the middle internal electrode 30 and the internal electrode 30 on the left is equal to the size of the second discharge gap 32 between the middle internal electrode 30 and the internal electrode 30 on the right.

[0061] An embodiment of the present invention provides another gas discharge tube. Fig.12 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention is shown. Based on the above embodiment, the perimeter of the cross section of the tubular electrode 10 is circular, and the inner electrodes 30 are arranged along the perimeter direction O1O2 of the cross section of the tubular electrode 10 .

[0062] in, Fig.12 The circumference of the cross section of the tubular electrode 10 is shown as an example, the number of discharge areas 11 is 3, the number of inner electrodes 30 is 3, and the inner electrode 30 is a columnar shape with a 120-degree fan-shaped cross section. Optionally, the second discharge gaps 32 of two inner electrodes 30 adjacent to each other in the order of arrangement along the circumference direction O1O2 are equal, that is, all D2 are equal. Optionally, the inner electrode 30 is a columnar body with a fan-shaped cross section. Optionally, the inner electrodes 30 have the same shape. The curved surface of the inner electrode 30 with a fan-shaped cross section is parallel to and opposite to a portion of the inner surface of the tubular electrode 10.

[0063] An embodiment of the present invention provides another gas discharge tube. Fig.13 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention. Based on the above embodiment, the perimeter of the cross section of the tubular electrode 10 is circular, and the inner electrodes 30 are arranged in multiple circles in a surrounding manner along the radial direction O3O4 of the cross section of the tubular electrode 10, and the number of the inner electrodes 30 in each circle is the same, and the number of the inner electrodes 30 in each circle is greater than or equal to 2.

[0064] in, Fig.13 For example, the circumference of the cross section of the tubular electrode 10 is a circle, there are 8 inner electrodes 30, the inner electrodes 30 are cylindrical with a fan-shaped cross section, the inner electrodes 30 are arranged in two circles along the radial direction O3O4 of the cross section of the tubular electrode 10, and the number of inner electrodes 30 in each circle is 4. Fig.13As shown, a corresponding first discharge gap 31 is formed between the outermost circle of inner electrodes 30 close to the inner surface of the tubular electrode 10 and the tubular electrode 10. No discharge gap is formed between the innermost circle of inner electrodes 30 and the tubular electrode 10. Optionally, the inner electrode 30 is a cylinder with a fan-shaped cross section. Optionally, the inner electrodes 30 are arranged in concentric rings. Optionally, the number of inner electrodes 30 on the same ring (i.e., the same circle) is an even number greater than or equal to 2. Optionally, along the radial direction O3O4, the inner electrodes 30 are arranged at equal intervals, that is, the second discharge gaps 32 between two inner electrodes 30 adjacent in the arrangement order are equal. Optionally, on the same ring (i.e., the same circle), along the circumference direction O1O2, the inner electrodes 30 are arranged at equal intervals, that is, the second discharge gaps 32 between two inner electrodes 30 adjacent in the arrangement order are equal.

[0065] Optionally, based on the above embodiment, continue to refer to Figures 2 to 7 , the number of inner electrodes 30 is 2, and the inner electrode 30 is a cylinder with a semicircular cross section. If the current carrying capacity of the gas discharge tube needs to be adjusted, the discharge area needs to be increased. The discharge surface in the axial direction only needs to adjust the height of the tubular electrode and the semi-cylindrical inner electrode. In this processing of the electrode, the mold is the same, only the height is adjusted; and the other insulating bases and insulating upper covers and solders do not need to be changed, which greatly increases the mold cost of product development and saves development costs. However, the gas discharge tube of the prior art needs to increase the transverse diameter, which requires changing the molds of all solders, electrodes, and porcelain tubes, and the manufacturing process is complicated and the cost is high.

[0066] The embodiment of the present invention provides another gas discharge tube. Fig.13 , two adjacent inner electrodes 30 are not electrically connected, and the inner electrode 30 adjacent to the same inner electrode 30 is electrically connected, so that part of the inner electrode 30 is conveniently connected to the first power supply line, and the rest of the inner electrode 30 is connected to the second power supply line, and the number of discharge gaps connected in parallel between the two power supply lines can be increased. The first power supply line and the second power supply line are different power supply lines.

[0067] in, Fig.13 The connection status of the inner electrodes 30 when the inner electrodes 30 are arranged in concentric rings is illustrated as an example, wherein, along the radial direction O3O4, two inner electrodes 30 that are adjacent in arrangement order are not electrically connected, but are electrically connected to the inner electrode 30 adjacent to the same inner electrode 30; along the circumferential direction O1O2, i.e., in the same ring (i.e., the same circle), two inner electrodes 30 that are adjacent in arrangement order are not electrically connected, but are electrically connected to the inner electrode 30 adjacent to the same inner electrode 30.

[0068] Optionally, based on the above embodiment, Fig.14A schematic diagram of a top view of the structure of another gas discharge tube provided in an embodiment of the present invention, wherein the number of inner electrodes is an even number greater than or equal to 4, so that the number of inner electrodes 30 connected to the first power supply line is equal to the number of inner electrodes 30 connected to the second power supply line, so that the current flowing through the unit area of ​​each inner electrode 30 is equal.

[0069] in, Fig.14 As an example, the circumference of the cross section of the tubular electrode 10 is a circle, there are four inner electrodes 30 , the inner electrodes 30 are cylindrical with a 90-degree fan-shaped cross section, and two diagonal inner electrodes 30 are electrically connected. Fig.14 Technical solutions and Figure 5 Compared with the technical solution of FIG. 1 , the use of electrode materials can be saved.

[0070] An embodiment of the present invention provides another gas discharge tube. Fig.15 A schematic top view of another gas discharge tube provided by an embodiment of the present invention. Fig.16 A schematic cross-sectional structure diagram of another gas discharge tube provided by an embodiment of the present invention. Based on the above embodiment, the perimeter of the cross section of the tubular electrode 10 is a rectangle, and the inner electrodes 30 are arranged in a row. Optionally, the inner electrodes 30 are rectangular. Optionally, the inner electrodes 30 have the same shape.

[0071] in, Fig.16 For gas discharge tube Fig.15 Schematic diagram of the cross-sectional structure along the AB direction. Fig.15 and Fig.16 As an example, the perimeter of the cross section of the tubular electrode 10 is a rectangle, the number of the inner electrodes 30 is four, the inner electrodes 30 are arranged in a row, and the inner electrodes 30 are rectangular parallelepipeds.

[0072] An embodiment of the present invention provides another gas discharge tube. Fig.17 A schematic diagram of a top view of another gas discharge tube provided by an embodiment of the present invention. Based on the above embodiment, the perimeter of the cross section of the tubular electrode 10 is rectangular, and the inner electrodes 30 are arranged in a matrix, the number of rows of the matrix arrangement is greater than or equal to 2, and the number of columns of the matrix arrangement is greater than or equal to 2. The row direction can be parallel to the length direction of the rectangular cross section of the tubular electrode 10. The column direction can be parallel to the width direction of the rectangular cross section of the tubular electrode 10.

[0073] in, Fig.17 As an example, the perimeter of the cross section of the tubular electrode 10 is a rectangle, the inner electrodes 30 are arranged in a matrix, the number of rows is 2, the number of columns is 4, and the inner electrodes 30 are rectangular parallelepiped.

[0074] Optionally, based on the above embodiment, continue to refer to Figures 15 to 17, the inner electrodes 30 are rectangular parallelepiped. Optionally, the inner electrodes 30 have the same shape.

[0075] Optionally, based on the above embodiment, continue to refer to Figures 15 to 17 , the first discharge gap 31 between each inner electrode 30 close to the inner surface of the tubular electrode 10 and the tubular electrode 10 is equal. That is, all D1 are equal.

[0076] Optionally, based on the above embodiment, continue to refer to Figures 15 to 17 , the first discharge gap 31 is larger than the second discharge gap 32. That is, D1 is larger than D2.

[0077] Optionally, based on the above embodiment, continue to refer to Figures 15 to 17 , the number of internal electrodes is at least 3, and the internal electrodes 30 are arranged at equal intervals. That is, all D2 are equal. The discharge gap 32 between any two adjacent internal electrodes 30 is equal. In the row direction, the internal electrodes 30 are arranged at equal intervals; in the column direction, the internal electrodes 30 are arranged at equal intervals. The discharge gap between two adjacent internal electrodes 30 in the row direction is equal to the discharge gap between two adjacent internal electrodes 30 in the column direction.

[0078] Optionally, based on the above embodiment, continue to refer to Figures 15 to 17 , two adjacent internal electrodes 30 are not electrically connected, and the internal electrodes 30 adjacent to the same internal electrode 30 are electrically connected. In the row direction, two adjacent internal electrodes 30 are not electrically connected, and the internal electrodes 30 adjacent to the same internal electrode 30 are electrically connected; in the column direction, two adjacent internal electrodes 30 are not electrically connected, and the internal electrodes 30 adjacent to the same internal electrode 30 are electrically connected, so that a part of the internal electrodes 30 are connected to the first power supply line, and the rest of the internal electrodes 30 are connected to the second power supply line, and the number of discharge gaps connected in parallel between the two power supply lines can be increased. The first power supply line and the second power supply line are different power supply lines.

[0079] Optionally, based on the above embodiment, continue to refer to Figures 15 to 17 , the number of internal electrodes 30 is an even number greater than or equal to 4, so that the number of internal electrodes 30 connected to the first power supply line is equal to the number of internal electrodes 30 connected to the second power supply line, so that the current flowing through the unit area of ​​each internal electrode 30 is equal.

[0080] Optionally, based on the above embodiment, continue to refer to Figures 2 to 7 The inner electrode 30 is provided with pins 35, and the pins 35 of all the inner electrodes 30 pass through the insulating component 20 on the same tube mouth of the tubular electrode 10 and extend to the outside of the discharge cavity 40, so that the welding surfaces of all the pins are coplanar, which is convenient for welding.

[0081] Optionally, based on the above embodiment, continue to refer to Figures 2 to 7 The pins 35 of the tubular electrode 10 and the welding surfaces of the pins 35 of all the inner electrodes 30 are coplanar, which facilitates welding.

[0082] The embodiment of the present invention provides an overvoltage protection device. Figures 2 to 9 The overvoltage protection device comprises: a gas discharge tube 1 provided in any embodiment of the present invention, a tubular electrode 10 electrically connected to the ground PE, and at least two inner electrodes 30 electrically connected to at least two AC power supply lines.

[0083] Wherein, the circuit 2 to be protected can be electrically connected to two AC power lines. When the voltage between any AC power line and the ground PE exceeds the opening voltage of the discharge gap between the AC power line and the ground, the discharge gap starts to discharge, changes from a high resistance state to a low resistance state, and forms a conductive state, so that the circuit 2 to be protected is protected from lightning strikes or overvoltage. When the voltage between the two AC power lines exceeds the opening voltage of the discharge gap between the two AC power lines, the discharge gap starts to discharge, changes from a high resistance state to a low resistance state, and forms a conductive state, so that the circuit 2 to be protected is protected from lightning strikes or overvoltage. The AC power line may include at least one of the following: a live line L and a neutral line N.

[0084] The overvoltage protection device provided in the embodiment of the present invention includes the gas discharge tube in the above embodiment. Therefore, the overvoltage protection device provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be described in detail here.

[0085] An embodiment of the present invention provides another overvoltage protection device. Fig.18 A schematic diagram of the structure of another overvoltage protection device provided by an embodiment of the present invention. Figures 2 to 8 , Fig.18 As shown, the overvoltage protection device further includes a first voltage-limiting surge protection device 3, a second voltage-limiting surge protection device 4 and a third voltage-limiting surge protection device 5. The number of the inner electrodes is 2, and the number of the AC power supply lines is 2.

[0086] Among them, one inner electrode 30 is electrically connected to an AC power line L through a first voltage-limiting surge protection device 3; another inner electrode 30 is electrically connected to another AC power line N through a second voltage-limiting surge protection device 4; and the tubular electrode 10 is electrically connected to the ground PE through a third voltage-limiting surge protection device 5.

[0087] Among them, optionally, the first voltage-limiting surge protection device 3 includes: a varistor or a transient suppression diode. The second voltage-limiting surge protection device 4 includes: a varistor or a transient suppression diode. Optionally, the third voltage-limiting surge protection device 5 includes: a varistor or a transient suppression diode. The protection of each circuit is a gas discharge tube in combination with a voltage-limiting surge protection device such as a varistor, and the low leakage current characteristic of the gas discharge tube when not conducting is used to overcome the problem of excessive leakage current and easy fire when a single voltage-limiting surge protection device such as a varistor is used. The clamping characteristics of voltage-limiting surge protection devices such as varistors and the switching characteristics of gas discharge tubes are used to discharge lightning current. The high voltage of the combination of the clamping high voltage characteristics of voltage-limiting surge protection devices such as varistors and gas discharge tubes is much greater than the working voltage of the power supply, so that the current of the power supply cannot be injected into the circuit, which is equivalent to a dam. The gas discharge tube 1 is equivalent to three discharge gaps connected in a triangle. Compared with the three discharge gaps connected in a star shape, the triangle circuit can be used multiple times in overcurrent protection with a varistor without replacing parts. The number of times each surge protection device is turned on can be reduced, the reliability and life of the circuit can be improved, and the residual pressure can be lower when surge interference occurs.

[0088] It should be noted that Figure 1 In the prior art three-electrode gas discharge tube, if the middle electrode 102 is electrically connected to the ground, and the upper electrode 101 and the lower electrode 103 are electrically connected to the live wire and the neutral wire respectively, the discharge gap between the live wire (or the neutral wire) and the ground will be smaller than the discharge gap between the live wire and the neutral wire. Since there is a problem of ground potential rebound caused by the grounding resistance, the discharge gap between the ground wire and the live wire and the discharge gap between the ground wire and the neutral wire will be set larger. Since there is no influence of the grounding resistance between the live wire and the neutral wire, the discharge gap between the live wire and the neutral wire is set smaller, that is, it is necessary to Figure 1 The size relationship of each discharge gap of the gas discharge tube is set to D3 = D4> D5, and Figure 1 D5 in the gas discharge tube is always larger than D3 and D4, so the discharge gap of the three-electrode gas discharge tube in the prior art cannot meet the required size relationship. The tubular electrode of the gas discharge tube in the technical solution of the embodiment of the present invention is grounded, part of the inner electrode is electrically connected to the live wire, and the other part of the inner electrode is electrically connected to the neutral wire. By setting the first discharge gap between the tubular electrode and the inner electrode to be larger than the second discharge gap between the inner electrodes, the discharge gap between the ground wire and the live wire and the discharge gap between the ground wire and the neutral wire can be equal, and the discharge gap between the live wire and the neutral wire is smaller than the discharge gap between the ground wire and the live wire, so it can be made Figure 7 In the example, D1>D2, the sizes D1 of the two first discharge gaps can be equal.

[0089] 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 described herein, and that various obvious changes, readjustments, combinations 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: Tubular electrodes; An insulating component, wherein the tube mouth of the tubular electrode is sealed and connected to the insulating component by solder to form a discharge cavity, wherein the discharge cavity is filled with a discharge gas; At least two inner electrodes are spaced apart and located in the discharge cavity, wherein the inner electrodes are spaced apart from the tubular electrode; The surface of the inner electrode adjacent to the inner surface of the tubular electrode is parallel to and opposite to a portion of the inner surface of the tubular electrode to form a first discharge gap; The opposing surfaces of two adjacent inner electrodes are parallel to form a second discharge gap, the extending direction of the tubular electrode is parallel to the opposing surfaces of the two adjacent inner electrodes, and the first discharge gap and the second discharge gap are located in the accommodation space of the tubular electrode; The first discharge gap is larger than the second discharge gap; The inner electrode is provided with pins, and all the pins of the inner electrode pass through the insulating component on the same tube opening of the tubular electrode and extend to the outside of the discharge cavity.

2. The gas discharge tube according to claim 1, characterized in that The circumference of the cross section of the tubular electrode is circular, and the inner electrodes are arranged along the circumference direction of the cross section of the tubular electrode; or, the inner electrodes are arranged in multiple circles in an encircling manner along the radius direction of the cross section of the tubular electrode, the number of inner electrodes in each circle is the same, and the number of inner electrodes in each circle is greater than or equal to 2.

3. The gas discharge tube according to claim 2, characterized in that: The inner electrode is a column with a fan-shaped cross section.

4. The gas discharge tube according to claim 3, characterized in that: The number of the inner electrodes is 2, and the inner electrodes are cylinders with semicircular cross sections.

5. The gas discharge tube according to claim 1, characterized in that: The perimeter of the cross section of the tubular electrode is rectangular, and the inner electrodes are arranged in a row or in a matrix. The number of rows in the matrix arrangement is greater than or equal to 2, and the number of columns in the matrix arrangement is greater than or equal to 2.

6. The gas discharge tube according to claim 5, characterized in that The inner electrode is a rectangular parallelepiped.

7. The gas discharge tube according to claim 1, characterized in that The number of the inner electrodes is at least 3, and the inner electrodes are arranged at equal intervals.

8. The gas discharge tube according to claim 7, characterized in that: Two adjacent internal electrodes are not electrically connected, but are electrically connected to an internal electrode adjacent to the same internal electrode.

9. The gas discharge tube according to claim 8, characterized in that: The number of the inner electrodes is an even number greater than or equal to 4.

10. The gas discharge tube according to claim 1, characterized in that The first discharge gap between each inner electrode close to the inner side surface of the tubular electrode and the tubular electrode is equal.

11. An overvoltage protection device, characterized in that: include: The gas discharge tube according to any one of claims 1 to 10, wherein the tubular electrode is electrically connected to the ground, and the at least two inner electrodes are electrically connected to at least two AC power supply lines.

12. The overvoltage protection device according to claim 11, characterized in that: The number of the inner electrodes is 2, the number of the AC power supply lines is 2; the overvoltage protection device further includes a first voltage-limiting surge protection device, a second voltage-limiting surge protection device and a third voltage-limiting surge protection device, One of the inner electrodes is electrically connected to an AC power supply line via the first voltage-limiting surge protection device; Another of the inner electrodes is electrically connected to another AC power supply line via the second voltage-limiting surge protection device; The tubular electrode is electrically connected to the ground via the third voltage-limiting surge protection device.

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