CN211788900U - Gas discharge tube and overvoltage protection device - Google Patents
Gas discharge tube and overvoltage protection device Download PDFInfo
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- CN211788900U CN211788900U CN202020368132.0U CN202020368132U CN211788900U CN 211788900 U CN211788900 U CN 211788900U CN 202020368132 U CN202020368132 U CN 202020368132U CN 211788900 U CN211788900 U CN 211788900U
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Abstract
The embodiment of the utility model discloses gas discharge tube and overvoltage protection device. Wherein, this gas discharge tube includes: the device comprises an insulating tube body, a terminal electrode and at least two inner electrodes; the terminal electrode is hermetically connected with the pipe orifice of the insulating pipe body through solder to form a discharge inner cavity, and discharge gas is filled in the discharge inner cavity; at least two internal electrodes which are arranged at intervals are positioned in the discharge inner cavity, and the internal electrodes and the terminal electrodes are arranged at intervals; the surface of the inner electrode close to the end electrode is parallel to and opposite to the part of the end electrode close to the inner side surface of the discharge cavity to form a first discharge gap; the surfaces of the two adjacent inner electrodes which are opposite to each other are parallel to form a second discharge gap, the extending direction of the insulating tube body is parallel to the surfaces of the two adjacent inner electrodes which are opposite to each other, and the first discharge gap and the second discharge gap are located in the accommodating space of the insulating tube body. The embodiment of the utility model provides a technical scheme can make the big or small relation of the discharge gap between each electrode of multipole gas discharge tube freely adjust.
Description
Technical Field
The utility model relates to an overvoltage protection technical field especially relates to a gas discharge tube and overvoltage protection device.
Background
Lightning and transient overvoltage of large electrical equipment can invade indoor electrical equipment and network equipment through circuits such as a power supply, an antenna, radio signal transceiving equipment and the like, so that equipment or components are damaged, casualties are caused, transmitted or stored data are interfered or lost, even the electronic equipment generates misoperation or temporary paralysis, system pause, data transmission interruption and damage to a local area network and even a wide area network, and therefore an overvoltage protection device needs to be arranged in the electronic equipment.
A triode gas discharge tube is a switching type protection device, and is generally used as an overvoltage protection device. Fig. 1 is a schematic cross-sectional view of a three-pole gas discharge tube in the prior art. The conventional triode gas discharge tube includes an upper end electrode 101, a first ceramic tube 104, a middle electrode 102, a second ceramic tube 105 and a lower end electrode 103 which are hermetically connected in this order by solder to form a discharge chamber. 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, the size of the discharge gap between the upper electrode 101 and the lower electrode 103 is D5, D5 is always larger than D3, D5 is always larger than D4, and adjusting the size of D3 or D4 affects D5, so that the adjustment of the size relationship of the discharge gap between the electrodes is limited, which is inconvenient to freely adjust.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a gas discharge tube and overvoltage protection device to realize the discharge gap mutual independence between each electrode among the gas discharge tube, the big or small relation in discharge gap between each electrode can freely be adjusted.
In a first aspect, an embodiment of the present invention provides a gas discharge tube, including:
an insulating tube body;
the terminal electrode is hermetically connected with the pipe orifice of the insulating pipe body through solder to form a discharge inner cavity, and discharge gas is filled in the discharge inner cavity;
at least two internal electrodes which are arranged at intervals are positioned in the discharge inner cavity, and the internal electrodes and the terminal electrodes are arranged at intervals;
the surface of the inner electrode close to the end electrode is parallel to and opposite to the part of the end electrode close to the inner side surface of the discharge cavity to form a first discharge gap;
the surfaces of the two adjacent inner electrodes which are opposite to each other are parallel to form a second discharge gap, the extending direction of the insulating tube body is parallel to the surfaces of the two adjacent inner electrodes which are opposite to each other, and the first discharge gap and the second discharge gap are located in the accommodating space of the insulating tube body.
Furthermore, the circumference of the cross section of the insulating tube body is circular, and the inner electrodes are arranged along the circumference direction of the cross section of the insulating tube body; or the inner electrodes are arranged in a surrounding manner in a plurality of circles along the radius direction of the cross section of the insulating tube body, the number of the inner electrodes in each circle is the same, and the number of the inner electrodes in each circle is more than or equal to 2.
Further, the inner electrode is a cylinder with a sector-shaped cross section.
Furthermore, the circumference of the cross section of the insulating tube body 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.
Further, the internal electrode is a rectangular parallelepiped.
Further, the first discharge gap is larger than the second discharge gap.
Furthermore, the number of the internal electrodes is at least 3, and the internal electrodes are arranged at equal intervals.
Further, the two adjacent internal electrodes are not electrically connected, and are electrically connected to the internal electrodes adjacent to the same internal electrode.
Further, the number of the inner electrodes is an even number greater than or equal to 4.
Further, the first discharge gaps between the inner electrodes and the terminal electrodes are equal.
Furthermore, the gas discharge tube also comprises an insulating part, the insulating tube body is provided with two tube openings, one tube opening of the insulating tube body is hermetically connected with the end electrode through solder to form a discharge inner cavity, the other tube opening of the insulating tube body is hermetically connected with the insulating part through solder, the inner electrode is provided with pins, and the pins of all the inner electrodes penetrate through the insulating part and extend to the outside of the discharge inner cavity.
In a second aspect, the embodiment of the present invention further provides an overvoltage protection device, including: the utility model discloses the gas discharge tube that arbitrary embodiment provided, end electrode and ground electricity are connected, and two at least inner electrodes are connected with two at least alternating current supply line electricity.
Furthermore, the number of the inner electrodes is 2, and the number of the alternating current supply lines is 2; the overvoltage protection device also comprises a first voltage-limiting surge protection device, a second voltage-limiting surge protection device and a third voltage-limiting surge protection device, wherein an inner electrode is electrically connected with an alternating current power supply line through the first voltage-limiting surge protection device; the other inner electrode is electrically connected with the other alternating current power supply line through a second voltage limiting type surge protection device; and the end electrode is connected with the ground through a third voltage limiting surge protection device.
In the technical scheme of the example of the utility model, gas discharge tube includes: the device comprises an insulating tube body, a terminal electrode and at least two inner electrodes, wherein the terminal electrode is hermetically connected with a tube opening of the insulating tube body through solder to form a discharge inner cavity which is filled with discharge gas; at least two internal electrodes which are arranged at intervals are positioned in the discharge inner cavity, and the internal electrodes and the terminal electrodes are arranged at intervals; the surface of the inner electrode close to the end electrode is parallel to and opposite to the part of the end electrode close to the inner side surface of the discharge cavity to form a first discharge gap; the opposite surfaces of the two adjacent inner electrodes are parallel to form a second discharge gap, the extending direction of the insulating tube body is parallel to the opposite surfaces of the two adjacent inner electrodes, the first discharge gap and the second discharge gap are positioned in the accommodating space of the insulating tube body, so that the mutual independence of the discharge gaps among the electrodes in the gas discharge tube can be realized, and the size relation of the discharge gaps among the electrodes can be freely adjusted.
Drawings
FIG. 1 is a schematic cross-sectional view of a prior art triode gas discharge tube;
fig. 2 is a schematic structural diagram of a gas discharge tube according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas discharge tube without welding an upper electrode according to an embodiment of the present invention;
fig. 4 is a schematic top view of a gas discharge tube according to an embodiment of the present invention;
fig. 5 is a schematic side view of a gas discharge tube according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a gas discharge tube according to an embodiment of the present invention;
FIG. 7 is a schematic view of an equivalent circuit structure of the gas discharge tube corresponding to FIG. 6;
fig. 8 is a schematic structural diagram of an overvoltage protection device according to an embodiment of the present invention;
fig. 9 is a schematic top view of another gas discharge tube according to an embodiment of the present invention;
fig. 10 is a schematic top view of another gas discharge tube according to an embodiment of the present invention;
fig. 11 is a schematic top view of another gas discharge tube according to an embodiment of the present invention;
fig. 12 is a schematic top view of another gas discharge tube according to an embodiment of the present invention;
fig. 13 is a schematic cross-sectional view of another gas discharge tube according to an embodiment of the present invention;
fig. 14 is a schematic top view of another gas discharge tube according to an embodiment of the present invention;
fig. 15 is a schematic top view of another gas discharge tube according to an embodiment of the present invention;
FIG. 16 is a schematic cross-sectional view of another gas discharge tube according to an embodiment of the present invention
Fig. 17 is a schematic structural diagram of another overvoltage protection device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the utility model provides a gas discharge tube. Fig. 2 is a schematic structural diagram of a gas discharge tube according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a gas discharge tube when an upper electrode is not welded according to an embodiment of the present invention. Fig. 4 is a schematic top view of a gas discharge tube according to an embodiment of the present invention. Fig. 5 is a schematic side view of a gas discharge tube according to an embodiment of the present invention. Fig. 6 is a schematic cross-sectional structure diagram of a gas discharge tube according to an embodiment of the present invention. Fig. 7 is a schematic view of an equivalent circuit structure of the gas discharge tube corresponding to fig. 6. Fig. 8 is a schematic structural diagram of an overvoltage protection device according to an embodiment of the present invention. As shown in fig. 2 to 8, the gas discharge tube 1 includes: an insulating tube body 10, a terminal electrode 20 and at least two internal electrodes 30.
The terminal electrode 20 is hermetically connected with the pipe orifice of the insulating pipe body 10 through solder 50 to form a discharge inner cavity 40, and discharge gas is filled in the discharge inner cavity 40; at least two internal electrodes 30 which are arranged at intervals are positioned in the discharge inner cavity 40, and the internal electrodes 30 and the terminal electrode 20 are arranged at intervals; the surface of the inner electrode 30 adjacent to the terminal electrode 20 is parallel to and opposite to the portion 21 of the terminal electrode 20 adjacent to the inner side surface of the discharge vessel 40 to form a first discharge gap 31; the opposing surfaces of two adjacent inner electrodes 30 are parallel to form a second discharge gap 32, the extending direction O5O6 of the insulating tube body 10 is parallel to the opposing surfaces of 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 insulating tube body 10.
The circumference of the cross section of the insulating pipe 10 may be a triangle, etc., and the embodiment of the present invention does not limit this. Alternatively, the circumference of the cross section of the insulating tube body 10 is circular or rectangular. The insulating pipe body 10 may include one of the following materials: ceramics, glass, and the like. The terminal electrode 20 may comprise at least one of the following materials: oxygen-free copper, iron-nickel alloy, tungsten-copper alloy, and the like. The discharge gas may include at least one of the following gases: inert gases (which may be helium, argon, krypton, xenon, radon), nitrogen and hydrogen, for example. The inner electrode 30 may include at least one of the following materials: oxygen-free copper, iron-nickel alloy, tungsten-copper alloy, and the like. The terminal electrode 20 and the internal electrode 30 are made of the same or different materials. The at least two internal electrodes 30 may be arranged in one or more rows. The at least two internal electrodes 30 may be arranged in an array. The inner electrode 30 may be columnar. The extending direction of the inner electrode 30 may be parallel to the extending direction O5O6 of the insulating tube body 10. The extending direction O5O6 of the insulating tube body 10 is parallel to the height direction of the gas discharge tube 1. The inner side surface of the terminal electrode 20 adjacent to the discharge cavity 40 is a discharge surface. The surface of the internal electrode 30 adjacent to the terminal electrode 20 is a discharge surface. The surface of the inner electrode 30 adjacent to the terminal electrode 20 is perpendicular to the extending direction O5O6 of the insulating tube 10. Different ones of the inner electrodes 30 are opposed to different portions 21 of the inner side surface of the terminal electrode 20 in the extending direction O5O6 of the insulating tube body 10. The terminal electrode 20 may be a sheet shape. Projections of the surfaces of all the inner electrodes 30 near the terminal electrode 20 on the terminal electrode 20 are arranged at intervals in the extending direction O5O6 of the insulating tube body 10. Fig. 6 is a schematic sectional view of the gas discharge tube 1 taken along the direction AB in fig. 4. Fig. 2 to 6 exemplarily show a case where the circumference of the cross section of the insulating tube 10 is circular, two inner electrodes 30 are provided, and the cross section of each inner electrode 30 is a column shape having a sector shape. Wherein, the two inner electrodes 30 are a first inner electrode 30-1 and a second inner electrode 30-2, respectively. The surface of the first internal electrode 30-1 adjacent to the terminal electrode 20 is parallel to and opposite to the first portion 21-1 of the inner side surface of the terminal electrode 20 to form a first discharge gap 31-1, which may be D1. The surface of the second internal electrode 30-2 adjacent to the terminal electrode 20 is parallel to and opposite to the second portion 21-2 of the inner side surface of the terminal electrode 20 to form a first discharge gap 31-2, which may be D1. The first internal electrode 30-1 may be provided with a pin 35-1, and the second internal electrode 30-2 may be provided with a pin 35-2. The opposing surfaces of the first and second internal electrodes 30-1 and 30-2 form a second discharge gap 32 therebetween, which may be D2. The terminal electrode 10 may be electrically connected to ground PE through its outer side surface 22 remote from the discharge vessel 40. The first inner electrode 30-1 is electrically connected to a power supply line, which may be, for example, a hot line L, via its pin 35-1. The second inner electrode 30-2 is electrically connectable via its pin 35-2 to another supply line, which may be a neutral line N, for example.
The first discharge gaps 31 between the inner electrodes 30 and the terminal electrodes 20 may be equal or different, and for example, the first discharge gaps 31-1 and 31-2 may be equal or different, that is, all D1 may be equal or different, which is not limited by the embodiment of the present invention. The size of the second discharge gap 32 between any two adjacent inner electrodes 30 may be equal or different, that is, the turn-on voltage of the second discharge gap 32 between any two adjacent inner electrodes 30 may be equal or different, that is, all D2 may be equal or different, which is not limited by the embodiment of the present invention. The size relationship between D1 and D2 may be set as required, and this is not limited by the present novel embodiment. Illustratively, D1 is less than or equal to D2, i.e., the turn-on voltage of a first discharge gap 31 between an inner electrode 30 and a terminal electrode 20 may be less than or equal to the turn-on voltage of a second discharge gap 32 between two adjacent inner electrodes 30. Optionally, D1 is greater than D2. The number of the terminal electrodes 20 may be one or two to seal one or two nozzles of the insulating tube body 10. The size of the first discharge gap 31 between any one of the inner electrodes 30 and the terminal electrode 20 can be adjusted by adjusting the height of the inner electrode 30 in the extending direction of the insulating tube 10; the size of the second discharge gap 32 between the adjacent inner electrodes 30 can be adjusted by adjusting the distance between the adjacent inner electrodes 30; the discharge gaps between the electrodes in the gas discharge tube 1 are independent of each other, and the magnitude relationship of the discharge gaps between the electrodes can be freely adjusted.
The working principle is as follows: when the voltage between the terminal electrode 20 and any one of the internal electrodes 30 reaches the turn-on voltage of the first discharge gap 31 formed between the internal electrode 30 and the terminal electrode 20, the first discharge gap 31 formed between the internal electrode 30 and the terminal electrode 20 starts to discharge, forming a conduction state, and discharging overvoltage and overcurrent to protect the device connected between the terminal electrode 20 and the internal electrode 30. When the voltage between the two internal electrodes 30 reaches the turn-on voltage of the second discharge gap 32 therebetween, the second discharge gap 32 between the two internal electrodes 30 starts discharging, forming a conduction state, releasing overvoltage and overcurrent to protect devices connected between the two internal electrodes 30.
The technical scheme of this example gas discharge tube includes: the device comprises an insulating tube body, a terminal electrode and at least two inner electrodes, wherein the terminal electrode is hermetically connected with a tube opening of the insulating tube body through solder to form a discharge inner cavity which is filled with discharge gas; at least two internal electrodes which are arranged at intervals are positioned in the discharge inner cavity, and the internal electrodes and the terminal electrodes are arranged at intervals; the surface of the inner electrode close to the end electrode is parallel to and opposite to the part of the end electrode close to the inner side surface of the discharge cavity to form a first discharge gap; the opposite surfaces of the two adjacent inner electrodes are parallel to form a second discharge gap, the extending direction of the insulating tube body is parallel to the opposite surfaces of the two adjacent inner electrodes, the first discharge gap and the second discharge gap are positioned in the accommodating space of the insulating tube body, so that the mutual independence of the discharge gaps among the electrodes in the gas discharge tube can be realized, and the size relation of the discharge gaps among the electrodes can be freely adjusted.
Optionally, on the basis of the above embodiment, fig. 9 is a schematic top view structure diagram of another gas discharge tube provided in the embodiment of the present invention, and the number of the inner electrodes 30 is greater than or equal to 3.
Fig. 9 exemplarily shows a case where the circumference of the cross section of the insulating tube 10 is circular, the number of the inner electrodes 30 is 3, and the cross section of the inner electrode 30 is a column shape having a sector shape.
Alternatively, on the basis of the above embodiment, with continued reference to fig. 4 and 9, the circumference of the cross section of the insulating tube body 10 is circular, and the inner electrodes 30 are arranged along the circumferential direction O1O2 of the cross section of the inner surface of the insulating tube body 10. Alternatively, the inner electrode 30 is a cylinder with a sector-shaped cross section. Alternatively, the inner electrodes 30 are the same size and shape. Fig. 4 exemplarily shows a case where each of the inner electrodes 30 is a semicircular cylinder. Fig. 9 exemplarily shows a case where each of the internal electrodes 30 is a cylinder having a sector shape of 120 degrees in cross section.
The embodiment of the utility model provides a further gas discharge tube. Fig. 10 is a schematic top view of another gas discharge tube according to an embodiment of the present invention. In the above embodiment, the circumference of the cross section of the insulating tube 10 is circular, and the inner electrodes 30 are arranged in a plurality of surrounding circles along the radial direction O3O4 of the cross section of the insulating tube 10. Optionally, 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. And (4) optional. The inner electrodes 30 are arranged in concentric rings. Alternatively, the inner electrode 30 is a cylinder with a sector-shaped cross section. The curved surface of the innermost ring of the inner electrodes 30 is parallel to the inner surface of the insulating tube body 10. Alternatively, the inner electrodes 30 located in the same ring (i.e., the same turn) are the same size and shape. Fig. 10 exemplarily shows a case where the circumference of the cross section of the insulating tube 10 is circular, the number of the inner electrodes 30 is 8, the inner electrodes 30 are arranged in two surrounding circles along the radial direction O3O4 of the cross section of the insulating tube 10, and the inner electrodes 30 are in a column shape having a sector-shaped cross section.
Optionally, on the basis of the above embodiment, with continued reference to fig. 4, the first discharge gap 31 is larger than the second discharge gap 32, i.e. D1 is larger than D2, so as to electrically connect the inner electrode 30 with the corresponding power supply line, and the terminal electrode 20 is connected with the ground, so as to ensure that the second discharge gap 32 between the power supply lines is smaller than the first discharge gap 31 between the ground line and the power supply line, so as to make the turn-on voltage of the second discharge gap 32 between the power supply lines smaller than the turn-on voltage of the first discharge gap 31 between the ground line and the power supply line, thereby avoiding the ground resistance existing after the ground line is grounded, and easily causing the ground counterattack to cause the breakdown of the discharge gap between the ground line and the live line and the discharge gap between the ground line and the neutral line.
Alternatively, on the basis of the above embodiment, with continued reference to fig. 9 and 10, the number of the internal electrodes 30 is at least 3, and the internal electrodes 30 are arranged at equal intervals. I.e. all D2 of the gas discharge tube 1 are of equal size. As shown in fig. 9, the internal electrodes 30 are arranged at equal intervals in the circumferential direction O1O2 of the cross section of the insulating tube body 10, that is, the second discharge gaps 32 between two internal electrodes 30 adjacent in the arrangement order are equal. As shown in fig. 10, the inner electrodes 30 located in the same ring are arranged at equal intervals in the circumferential direction O1O2 of the cross section of the insulating tube body 10, that is, the second discharge gaps 32 between two inner electrodes 30 adjacent in the arrangement order are equal. Alternatively, the inner electrodes 30 are arranged at equal intervals along the radial direction O3O4 of the cross section of the insulating tube 10, that is, the second discharge gaps 32 between two inner electrodes 30 adjacent to each other in the arrangement order are equal.
Alternatively, on the basis of the above embodiment, fig. 11 is a schematic top view structure diagram of another gas discharge tube provided in the embodiment of the present invention, in which 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 as to conveniently connect a part of the internal electrodes 30 to the first power supply line, and connect the other part of the internal electrodes 30 to the second power supply line, and increase the number of discharge gaps connected in parallel between the two power supply lines. The first power supply line and the second power supply line are different power supply lines.
Alternatively, the pins of the electrically connected inner electrodes 30 are electrically connected together at the outer surface or the inner surface of the gas discharge tube 1 to achieve the electrical connection of the inner electrodes 30. Alternatively, the pins of the electrically connected inner electrodes 30 may be electrically connected by traces on the printed circuit board to electrically connect the inner electrodes 30. Can set up as required, the embodiment of the utility model provides a do not restrict this.
Fig. 11 exemplarily shows a case where the circumference of the cross section of the insulating tube 10 is circular, the number of the inner electrodes 30 is 4, the cross section of each inner electrode 30 is a column with a sector shape of 90 degrees, and the two diagonal inner electrodes 30 are electrically connected. The solution of fig. 11 allows to save the use of electrode material compared to the solution of fig. 4.
Fig. 10 exemplarily shows a connection condition of the internal electrodes 30 when the internal electrodes 30 are arranged in a concentric ring manner, wherein two internal electrodes 30 adjacent to each other in the arrangement order are not electrically connected and are electrically connected to the internal electrodes 30 adjacent to the same internal electrode 30 along the radial direction O3O 4; in the circumferential direction O1O2, that is, in the same ring (i.e., the same turn), two internal electrodes 30 adjacent to each other in the arrangement order are not electrically connected to each other, and the internal electrodes 30 adjacent to the same internal electrode 30 are electrically connected to each other.
Alternatively, on the basis of the above-described embodiment, with continued reference to fig. 10 and 11, the number of the internal electrodes 30 is an even number greater than or equal to 4, so that the number of the internal electrodes 30 connected to the first power supply line is equal to the number of the internal electrodes 30 connected to the second power supply line, so that the currents flowing per unit area of the respective internal electrodes 30 are equal. Optionally, the inner electrodes 30 are arranged in concentric rings, the number of the inner electrodes 30 in each ring is the same, and the number of the inner electrodes 30 in each ring is an even number greater than or equal to 2.
Alternatively, with continued reference to fig. 4 on the basis of the above embodiment, the first discharge gaps 31 between the respective inner electrodes 30 and the terminal electrodes 20 are equal. I.e. all D1 in the gas discharge tube 1 are equal.
The embodiment of the utility model provides a further gas discharge tube. Fig. 12 is a schematic top view of another gas discharge tube according to an embodiment of the present invention. Fig. 13 is a schematic cross-sectional view of another gas discharge tube according to an embodiment of the present invention. In the above embodiment, the circumference of the cross section of the insulating tube 10 is rectangular, and the internal electrodes 30 are arranged in a line. Optionally, the inner electrode 30 is a cuboid. Alternatively, the inner electrodes 30 are the same size and shape.
Fig. 13 is a schematic cross-sectional view of the gas discharge tube along the direction AB in fig. 12. Fig. 12 and 13 exemplarily show a case where the circumference of the cross section of the insulating tube body 10 is rectangular, the number of the internal electrodes 30 is 3, the internal electrodes 30 are arranged in a line, and the internal electrodes 30 are rectangular solids.
The embodiment of the utility model provides a further gas discharge tube. Fig. 14 is a schematic top view of another gas discharge tube according to an embodiment of the present invention. On the basis of the above embodiment, the circumference of the cross section of the insulating tube body 10 is rectangular, and the internal electrodes 30 are arranged in a matrix form. 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. Optionally, the inner electrode 30 is a cuboid. Alternatively, the inner electrodes 30 are the same size and shape.
In fig. 14, the circumference of the cross section of the insulating tube 10 is exemplarily shown as a rectangle, the number of the inner electrodes 30 is 8, the inner electrodes 30 are arranged in a matrix form, the number of rows is 2, the number of columns is 4, and the inner electrodes 30 are cuboids.
Alternatively, on the basis of the above-described embodiment, with continued reference to fig. 13, the first discharge gap 31 is larger than the second discharge gap 32. I.e., D1 is greater than D2.
Alternatively, on the basis of the above embodiment, with continuing reference to fig. 12 to 14, the number of the internal electrodes 30 is at least 3, and the internal electrodes 30 are arranged at equal intervals. I.e. all D2 of the gas discharge tube 1 are equal.
Wherein, as shown in fig. 14, the inner electrodes 30 are arranged at equal intervals in the row direction; the internal electrodes 30 are arranged at equal intervals in the column direction. The row direction is parallel to the length direction of the rectangular cross section of the insulating tube body 10. The column direction is parallel to the width direction of the rectangular cross section of the insulating tube body 10.
Alternatively, on the basis of the above embodiment, with continued reference to fig. 14, two adjacent internal electrodes 30 are not electrically connected, and are electrically connected to the internal electrodes 30 adjacent to the same internal electrode 30.
As shown in fig. 14, in the row direction, the inner electrodes 30 ordered as odd numbers are electrically connected, the inner electrodes 30 ordered as even numbers are electrically connected, and the inner electrodes 30 ordered as odd numbers and the inner electrodes 30 ordered as even numbers are not electrically connected; in the column direction, the inner electrodes 30 arranged in the odd number are electrically connected, the inner electrodes 30 arranged in the even number are electrically connected, and the inner electrodes 30 arranged in the odd number and the inner electrodes 30 arranged in the even number are not electrically connected.
Alternatively, on the basis of the above embodiment, fig. 15 is a schematic top view structure diagram of another gas discharge tube provided in the embodiment of the present invention, fig. 16 is a schematic cross-sectional structure diagram of another gas discharge tube provided in the embodiment of the present invention, and the number of the inner electrodes 30 is an even number greater than or equal to 4, so that the number of the inner electrodes 30 connected to the first power supply line is equal to the number of the inner electrodes 30 connected to the second power supply line, and the current flowing in each unit area of the inner electrodes 30 is equal. Fig. 16 is a schematic sectional view of the gas discharge tube taken along the direction AB in fig. 15. The solution of fig. 16 allows to save the use of electrode material compared to the solution of fig. 4.
In fig. 15 and 16, the circumference of the cross section of the insulating tube 10 is exemplarily shown as a rectangle, the internal electrodes 30 are arranged in a line, the number of the internal electrodes 30 is 4, and the internal electrodes 30 are rectangular solids.
Alternatively, with continued reference to fig. 13 and 16 on the basis of the above-described embodiment, the first discharge gaps 31 between the respective inner electrodes 30 and the terminal electrodes 20 are equal. I.e. all D1 in the gas discharge tube 1 are equal.
Optionally, on the basis of the above embodiment, with continuing reference to fig. 6 and 13, the gas discharge tube 1 further includes an insulating member 11, the insulating tube 10 has two tube openings, one tube opening of the insulating tube 10 is hermetically connected to the terminal electrode 20 by solder 50 to form a discharge cavity 40, the other tube opening of the insulating tube 10 is hermetically connected to the insulating member 11 by solder 50, the internal electrodes 30 are provided with pins 35, and all the pins 35 of the internal electrodes 30 penetrate through the insulating member 11 and extend to the outside of the discharge cavity 40 to facilitate the soldering of the gas discharge tube 1 to the printed circuit board through the pins 35. The insulating tube 10 and the insulating member 11 may be integrally formed, that is, the insulating tube 10 may have one end as a tube opening and the other end as a blind end.
Optionally, on the basis of the above embodiment, the terminal electrode 20 is provided with a pin, and the pin of the terminal electrode 20 is coplanar with the soldering surfaces of the pins 35 of all the internal electrodes 30, so as to facilitate soldering to the printed circuit board.
An embodiment of the utility model provides an overvoltage protection device. As shown in fig. 2 to 8, the overvoltage protection device includes: the utility model discloses the gas discharge tube 1 that arbitrary embodiment provided, end electrode 20 is connected with ground PE electricity, and two at least inner electrodes 30 are connected with two at least alternating current supply line electricity.
Wherein the circuit 2 to be protected can be electrically connected to two ac supply lines. When the voltage between any ac power supply line and ground PE exceeds the turn-on voltage of the discharge gap between the ac power supply line and ground, the discharge gap starts to discharge, changes from a high-resistance state to a low-resistance state, and becomes 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 supply lines exceeds the opening voltage of the discharge gap between the two ac supply lines, the discharge gap starts to discharge, changing from a high-resistance state to a low-resistance state, forming a conducting state, so that the circuit 2 to be protected is protected from lightning strikes or overvoltage. The ac supply line may comprise at least one of: live line L and neutral line N.
The embodiment of the utility model provides an overvoltage protection device includes the gas discharge tube in above-mentioned embodiment, consequently the embodiment of the utility model provides an overvoltage protection device also possesses the beneficial effect that the above-mentioned embodiment described, and this is no longer repeated here.
The embodiment of the invention provides a further overvoltage protection device. Fig. 17 is a schematic structural diagram of another overvoltage protection device according to an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 17 in conjunction with fig. 2 to 7, 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. Optionally, the number of the inner electrodes is 2. Optionally, the number of ac supply lines is 2.
Wherein, an inner electrode 30 is electrically connected with an alternating current supply line L through a first voltage limiting surge protection device 3; the other inner electrode 30 is electrically connected with the other alternating current supply line N through a second voltage-limiting surge protection device 4; the terminal electrode 20 is electrically connected to the ground PE through the third voltage limiting surge protection device 5.
Wherein, optionally, the first voltage-limiting surge protection device 3 includes: a varistor or a transient suppression diode. The second voltage limiting type 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. Each path of protection is used by matching a gas discharge tube with voltage-limiting surge protection devices such as a piezoresistor and the like, and the problem that when the voltage-limiting surge protection devices such as a piezoresistor and the like are used, the excessive leakage current is easy to cause fire is solved by utilizing the low leakage current characteristic of the gas discharge tube when the gas discharge tube is not conducted. The clamping characteristic of voltage-limiting surge protection devices such as piezoresistors and the switching characteristic of a gas discharge tube are utilized to discharge lightning current. The clamping high voltage characteristic of voltage-limiting surge protection devices such as piezoresistors and the like and the high voltage of the combination of the gas discharge tube are far greater than the working voltage of a power supply, so that the current of the power supply cannot be injected into a circuit, and the device is equivalent to a barrage. The gas discharge tube 1 is equivalent to three discharge gaps in triangular connection, and compared with the mode of three discharge gaps in star connection, the triangular circuit matched piezoresistor can be used for multiple times in overcurrent protection without replacing components, so that the conduction times of each surge protection device can be reduced, the reliability and the service life of the circuit can be improved, and the residual voltage is lower when surge interference occurs.
In the conventional tripolar gas discharge tube shown in fig. 1, when the middle electrode 102 is electrically connected to 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 is smaller than the discharge gap between the live wire and the neutral wire, the problem of ground potential counterattack caused by the existence of ground resistance can set the discharge gap between the ground wire and the live wire and the discharge gap between the ground wire and the zero wire to be larger, the influence of the grounding resistance does not exist between the live wire and the zero wire, so the discharging gap between the live wire and the zero wire is set to be smaller, that is, the relationship of the magnitude of each discharge gap of the gas discharge tube in fig. 1 needs to be set to D3 ═ D4> D5, since D5 in the gas discharge tube of fig. 1 is always larger than D3 and D4, the discharge gap of the prior art three-pole gas discharge tube cannot satisfy the required size relationship. Will the utility model discloses gas discharge tube's among the technical scheme termination electrode ground connection, be connected partial inner electrode and live wire electricity, another partial inner electrode is connected with the zero line electricity, through with the termination electrode and the inner electrode between first discharge gap set up to be greater than the second discharge gap between the inner electrode, can realize that the discharge gap between ground wire and the live wire equals with the discharge gap between ground wire and the zero line, discharge gap between live wire and the zero line is less than the discharge gap between ground wire and the live wire, the event can make D1 in figure 6 > D2, two first discharge gap's big or small D1 equal can.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (13)
1. A gas discharge tube, comprising:
an insulating tube body;
the terminal electrode is hermetically connected with the pipe orifice of the insulating pipe body through solder to form a discharge inner cavity, and discharge gas is filled in the discharge inner cavity;
at least two internal electrodes which are arranged at intervals and are positioned in the discharge inner cavity, wherein the internal electrodes and the terminal electrodes are arranged at intervals;
the surface of the inner electrode close to the terminal electrode is parallel to and opposite to the part of the terminal electrode close to the inner side surface of the discharge inner cavity so as to form a first discharge gap;
the opposite surfaces of two adjacent inner electrodes are parallel to form a second discharge gap, the extending direction of the insulating tube body is parallel to the opposite surfaces of two adjacent inner electrodes, and the first discharge gap and the second discharge gap are positioned in the accommodating space of the insulating tube body.
2. The gas discharge tube of claim 1, wherein the circumference of the cross-section of the insulating tube body is circular, and the inner electrodes are arranged along the circumference of the cross-section of the insulating tube body; or the inner electrodes are arranged in a surrounding manner in a plurality of circles along the radius direction of the cross section of the insulating tube body, the number of the inner electrodes in each circle is the same, and the number of the inner electrodes in each circle is more than or equal to 2.
3. The gas discharge tube of claim 2, wherein the inner electrode is a cylinder having a sector-shaped cross-section.
4. The gas discharge tube of claim 1, wherein the insulating tubulation has a rectangular cross-sectional perimeter, the inner electrodes are arranged in a row or in a matrix, the number of rows in the matrix is greater than or equal to 2, and the number of columns in the matrix is greater than or equal to 2.
5. The gas discharge tube of claim 4, wherein the inner electrode is a cuboid.
6. The gas discharge tube of claim 1, wherein the first discharge gap is larger than the second discharge gap.
7. The gas discharge tube of claim 1, wherein the number of inner electrodes is at least 3, and the inner electrodes are arranged at equal intervals.
8. The gas discharge tube of claim 7, wherein two adjacent inner electrodes are not electrically connected and are electrically connected to inner electrodes adjacent to the same inner electrode.
9. The gas discharge tube of claim 8, wherein the number of inner electrodes is an even number greater than or equal to 4.
10. The gas discharge tube of claim 1, wherein the first discharge gap between each inner electrode and the end electrode is equal.
11. The gas discharge tube of claim 1, further comprising an insulating member, the insulating tube having two orifices, one orifice of the insulating tube being hermetically connected to the terminal electrode by solder to form a discharge chamber, the other orifice of the insulating tube being hermetically connected to the insulating member by solder, the internal electrodes being provided with pins, all of the pins of the internal electrodes passing through the insulating member and extending outside the discharge chamber.
12. An overvoltage protection device, comprising: a gas discharge tube according to any of claims 1 to 11, wherein the end electrodes are electrically connected to ground and the at least two internal electrodes are electrically connected to at least two ac supply lines.
13. The overvoltage protection device of claim 12, wherein the number of said internal electrodes is 2, and the number of said ac supply lines is 2; the overvoltage protection device also comprises 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 internal electrodes is electrically connected with an alternating current power supply line through the first voltage-limiting surge protection device;
the other internal electrode is electrically connected with the other alternating current power supply line through the second voltage-limiting surge protection device;
and the terminal electrode is connected with the ground through the third voltage-limiting surge protection device.
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| CN202020368132.0U CN211788900U (en) | 2020-03-20 | 2020-03-20 | Gas discharge tube and overvoltage protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112927935A (en) * | 2021-01-23 | 2021-06-08 | 深圳市凯特电子有限公司 | Anti-lightning stroke electrolytic capacitor and production process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112927935A (en) * | 2021-01-23 | 2021-06-08 | 深圳市凯特电子有限公司 | Anti-lightning stroke electrolytic capacitor and production process thereof |
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