CN215299780U - Gas discharge tube - Google Patents
Gas discharge tube Download PDFInfo
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- CN215299780U CN215299780U CN202120831021.3U CN202120831021U CN215299780U CN 215299780 U CN215299780 U CN 215299780U CN 202120831021 U CN202120831021 U CN 202120831021U CN 215299780 U CN215299780 U CN 215299780U
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Abstract
The utility model belongs to the technical field of discharge tube, a gas discharge tube is provided, gas discharge tube include two electrodes and be used for enclosing the insulating body that forms the holding chamber with two electrodes, wherein, the holding chamber is used for holding insulating gas, and the electrode is located the fixed graphite electron emitter that is equipped with on the surface of holding intracavity. According to the gas discharge tube, the work function of the graphite electron emitter is small, the time for forming the electron collapse between the two electrodes is short, so that the response time of the gas discharge tube is short, the breakdown voltage is low, and the gas discharge tube can rapidly discharge surge and can meet the requirement of an electric element on low breakdown voltage; and because the work function of the graphite electron emitter is stable, the density of emitted electrons is stable, and the graphite electron emitter is resistant to high-temperature electric arc, the phenomena of melting, sputtering and the like of the electrode can be avoided, and the breakdown voltage fluctuation of the gas discharge tube is small.
Description
Technical Field
The application relates to the technical field of discharge tubes, in particular to a gas discharge tube.
Background
A gas discharge tube is a switching type protection device, and is generally used as an overvoltage protection device. Currently used gas discharge tubes generally comprise an insulating tube and electrodes sealed at both ends thereof. The insulating tube body and the electrodes with two sealed ends are filled with proper inert gas medium, the opposite surfaces of the two electrodes are coated with electron emission material (such as electron powder), when the voltage at the two ends of the electrodes of the gas discharge tube exceeds the breakdown voltage of gas, gap discharge can be caused, the gas discharge tube is rapidly changed from a high resistance state to a low resistance state to form conduction, and other devices connected with the gas discharge tube in parallel are protected.
With the popularization of mobile terminals and the requirement of miniaturization of electronic products, products with lower breakdown voltage and better protection capability are urgently needed to prevent surge in electronic circuits, and the voltage protection level of the existing gas discharge tube with lower breakdown voltage is not stable enough.
SUMMERY OF THE UTILITY MODEL
An object of the embodiments of the present application is to provide a gas discharge tube and a method for manufacturing the same, so as to solve the technical problem in the prior art that the voltage protection level of the gas discharge tube with a lower breakdown voltage is poor.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: the gas discharge tube comprises at least two electrodes and an insulating tube body which is used for enclosing the two electrodes to form an accommodating cavity, wherein the accommodating cavity is used for accommodating insulating gas, and a graphite electron emitter is fixedly arranged on the surface of the electrode, which is positioned in the accommodating cavity.
In one embodiment, the surface of the electrode in the accommodating cavity is provided with a concave portion, and the corresponding graphite electron emitter is fixedly embedded in the concave portion.
In one embodiment, the electrode is provided with a convex portion on the surface thereof located in the accommodating cavity, and the corresponding graphite electron emitter is fixedly arranged on the convex portion and covers the convex portion.
In one embodiment, the corresponding graphite electron emitter covers the convex portion.
In one embodiment, the insulating gas in the accommodating cavity is electronegative gas.
In one embodiment, the accommodating cavity is used for accommodating carbon tetrafluoride gas.
In one embodiment, the accommodating cavity is used for accommodating sulfur hexafluoride gas.
In one embodiment, the pressure of the electronegative gas in the accommodating cavity is 28-32 kpa.
In one embodiment, the insulating tube is a teflon tube.
In one embodiment, the insulating tube is an epoxy tube.
In order to achieve the above object, the present application also provides a method of manufacturing a gas discharge tube for manufacturing the above gas discharge tube, the method comprising:
preparing two electrodes, and preparing two graphite electron emitters by using graphite powder with the mass fraction of 70% -100% and titanium dioxide powder with the mass fraction of 0% -30%;
securing each of the graphite electron emitters to a corresponding one of the electrodes;
in an electronegative gas environment, the two electrodes are fixed by adopting a mould, and the peripheries of the two electrodes are poured by liquid epoxy resin or liquid polytetrafluoroethylene to form an insulating pipe body.
In one embodiment, the step of forming the two graphite electron emitters comprises:
uniformly mixing 70-100% of graphite powder and 0-30% of titanium dioxide powder by mass to obtain first mixed powder, and forming the first mixed powder;
and placing the formed first mixed powder in a sintering device for sintering, wherein the sintering temperature is 1500-2000 ℃.
In one embodiment, the step of forming the two graphite electron emitters comprises:
uniformly mixing 70-100% of graphite powder and 0-30% of titanium dioxide powder by mass to obtain second mixed powder, and adding a binder into the second mixed powder;
putting the second mixed powder added with the binder into a mould to prepare a compact;
placing the pressed blank in a baking device for baking at the temperature of 150-200 ℃.
In one embodiment, fixing each of the electron emitters to the corresponding electrode includes: punching the electrode emitter into the corresponding electrode by adopting an external machining device; or, the corresponding electrodes are poured on the periphery of the graphite electron emitter.
The application provides a gas discharge tube's beneficial effect lies in: compared with the prior art, the gas discharge tube provided by the application has the advantages that the work function of the graphite electron emitter is small, the electron emissivity is high, the time for forming the electron collapse between the two electrodes is short, the response time of the gas discharge tube is short, the breakdown voltage is low, and the gas discharge tube can rapidly discharge surge and can meet the requirement of an electrical element on low breakdown voltage; and because the work function of the graphite electron emitter is stable, the density of electrons emitted by the graphite electron emitter is stable, and the high-temperature-resistant electric arc performance of the graphite electron emitter is good, so that the graphite electron emitter can be stably connected to the surface of a corresponding electrode, cannot easily fall off, can avoid the phenomena of melting, sputtering and the like of the electrode, and ensures that the gas discharge tube has small breakdown voltage fluctuation and good voltage protection level stability in the long-time use process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a gas discharge tube according to an embodiment of the present disclosure;
FIG. 2 is an exploded view of the gas discharge tube of FIG. 1;
FIG. 3 is a schematic view of a partial structure of the gas discharge tube shown in FIG. 1;
FIG. 4 is a first schematic view of a graphite electron emitter and an electrode with the graphite electron emitter embedded in the electrode according to an embodiment of the present disclosure;
FIG. 5 is a second schematic structural view of an electrode and a graphite electron emitter according to an embodiment of the present disclosure when the graphite electron emitter is embedded in the electrode;
fig. 6 is a schematic structural view of an electrode and a graphite electron emitter when the graphite electron emitter is fastened to the electrode according to an embodiment of the present disclosure.
Wherein, in the figures, the respective reference numerals:
100-electrodes; 110-a recess; 120-a convex part; 200-an insulating tube body; 300-an accommodating cavity; 400-graphite electron emitters; 410-grooves.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 3, a gas discharge tube according to an embodiment of the present application will be described. The gas discharge tube includes two electrodes 100 and an insulating tube 200 surrounding the two electrodes 100 to form an accommodating chamber 300, wherein the accommodating chamber 300 is used for accommodating insulating gas, and a graphite electron emitter 400 is fixed on the surface of the electrode 100 in the accommodating chamber 300.
It should be noted that the electrode 100 may be made of various materials, such as copper, iron-nickel alloy, etc., and may be selected according to the needs, which is not limited herein. The graphite electron emitter 400 may have a multi-structure, such as a block structure, a cap structure, etc., and may be disposed as needed, which is not limited herein. The graphite electron emitter 400 comprises graphite with the mass fraction of 70-100% and titanium dioxide with the mass fraction of 0-30%, the graphite has the characteristics of small work function and stable work function, the titanium dioxide has the characteristics of good electron transport performance, high temperature resistance and good stability, the mass fraction of the graphite and the mass fraction of the titanium dioxide in the graphite electron emitter 400 are one hundred percent in total, for example, the graphite electron emitter 400 can be directly made of graphite sheets; for another example, the graphite electron emitter 400 may be made using 80% graphite powder and 20% titanium dioxide powder, and for another example, the electron emitter 400 may be made using 99% graphite powder and 1% titanium dioxide powder.
Compared with the prior art, the gas discharge tube provided by the application has the advantages that the work function of the graphite electron emitter 400 is small, the electron emissivity is high, the time for forming the electron avalanche between the two electrodes 100 is short, the response time of the gas discharge tube is short, the breakdown voltage is low, and the gas discharge tube can quickly discharge the lightning surge and can adapt to the requirement of an electrical element on low breakdown voltage; and because the work function of the graphite electron emitter 400 is stable, the density of electrons emitted by the graphite electron emitter 400 is stable, and the high-temperature-resistant electric arc performance of the graphite electron emitter 400 is good, so that the graphite electron emitter can be more stably connected to the surface of the corresponding electrode 100, the graphite electron emitter cannot easily fall off, the phenomena of melting, sputtering and the like of the electrode 100 can be avoided, and the gas discharge tube has small breakdown voltage fluctuation and good voltage protection level stability in the long-time use process.
In another embodiment of the present application, referring to fig. 4 and 5, the surface of the electrode 100 in the accommodating cavity 300 is provided with a concave portion 110, and the corresponding graphite electron emitter 400 is fixedly embedded in the concave portion 110.
It should be noted that the cross section of the graphite electron emitter 400 is adapted to the cross section of the recess 110, and may be polygonal, circular, etc., and may be provided as needed, which is not limited herein. The graphite electron emitter 400 may be embedded in the recess 110 in various ways, for example, a machining device is used to punch the graphite electron emitter 400 into the surface of the electrode 100 to form the recess 110, the graphite electron emitter 400 is tightly connected to the surface of the electrode 100, for example, a liquid metal or a liquid metal alloy is directly poured around the graphite electron emitter 400 to form the electrode 100, and the cooled electrode 100 is tightly connected to the graphite electron emitter 400.
Compared with the traditional gas discharge tube adopting the electron emission material coating, the gas discharge tube provided by the embodiment has the advantages that the thickness of the graphite electron emitter 400 is thicker than that of the electron emission material coating, so that the gas discharge tube has a better covering effect on the electrode 100, and the electrode 100 can be prevented from being melted or sputtered due to high-temperature electric arc; and the connection of the graphite electron emitter 400 and the electrode 100 is more firm than the connection of the electron emission material coating and the motor, so that the graphite electron emitter is less prone to being peeled off from the surface of the electrode 100 when the gas discharge tube is conducted, the electrode 100 is more stably protected, and the stability of the voltage protection level of the gas discharge tube is further improved.
In another embodiment of the present application, referring to fig. 6, the electrode 100 is provided with a protrusion 120 on the surface thereof inside the receiving cavity 300, and the corresponding graphite electron emitter 400 is fixedly disposed on the protrusion 120.
It should be noted that the graphite electron emitter 400 may be fixedly disposed on the protrusion 120 in various ways, for example, a mold is used to fix the graphite electron emitter 400, then the liquid metal or liquid metal alloy is poured on the graphite electron emitter 400 to form the electrode 100, and for example, a groove 410 having an inner diameter slightly smaller than an outer diameter of the protrusion 120 is formed on the graphite electron emitter 400, and the protrusion 120 is pressed into the groove 410 of the graphite electron emitter 400 by a machining device, which may be disposed as required, and is not limited herein.
In the gas discharge tube provided in this embodiment, the graphite electron emitter 400 can be firmly connected to the surface of the electrode 100 located in the accommodating cavity 300, so as to prevent the electrode 100 from melting or sputtering due to high-temperature arc, which is beneficial to improving the stability of the voltage protection level of the gas discharge tube.
In another embodiment of the present application, referring to fig. 6, the corresponding graphite electron emitter 400 covers the protrusion 120.
In the gas discharge tube of the present embodiment, the graphite electron emitter 400 can completely cover the surface of the projection 120, and the electrode 100 can be protected more effectively.
In another embodiment of the present application, referring to fig. 3, the insulating gas in the accommodating chamber 300 is an electronegative gas. The gas discharge tube with the structure has the advantages that electronegative gas has strong electron obtaining capacity, power frequency follow current can be rapidly extinguished, the voltage drop of electric arcs is improved, and re-ignition of the electric arcs can be avoided.
In another embodiment of the present application, referring to fig. 3, the accommodating chamber 300 is used for accommodating carbon tetrafluoride gas or sulfur hexafluoride gas.
The gas discharge tube provided by the embodiment has the advantages that the carbon tetrafluoride gas and the sulfur hexafluoride gas have good arc extinguishing performance, the liquefaction temperature is low, the chemical stability is good, the production is simple, the cost is low, and the gas discharge tube is convenient to manufacture and use.
In another embodiment of the present application, referring to FIG. 3, the pressure of the electronegative gas in the receiving chamber 300 is between-70 kPa and 80 kPa.
It should be noted that, when the distance between the two electrodes 100 of the gas discharge tube, the material of the graphite electron emitter 400, and the kind of the electronegative gas in the housing chamber 300 are fixed, the breakdown pressure of the gas discharge tube decreases first and then increases as the pressure of the electronegative gas increases.
The gas discharge tube that this embodiment provided, its pressure setting through with electronegative gas is in reasonable within range, can guarantee that gas discharge tube can extinguish the power fast and continue, has lower breakdown pressure simultaneously, is favorable to gas discharge tube to satisfy the demand of electrical component to low electrical pressure.
In another embodiment of the present application, the insulating tube body 200 is an epoxy tube body.
The epoxy resin is a high molecular compound containing an epoxy group in a molecular structure, and the epoxy resin cured by the epoxy resin has good physical and chemical properties, excellent bonding strength to the surfaces of metal and nonmetal materials, good dielectric property, small deformation shrinkage, good product dimensional stability, high hardness, good flexibility and stability to alkali and most solvents.
The gas discharge tube that this embodiment provided, its epoxy body mechanical properties is good, can guarantee to bond well with electrode 100, makes gas discharge tube's structural stability good, and the epoxy body has good electric arc resistance and high temperature resistance, can guarantee that gas discharge tube's voltage protection horizontal stability is good.
In another embodiment of the present application, the insulating tube 200 is a teflon tube.
Polytetrafluoroethylene is a polymer compound obtained by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing properties, electrical insulating properties, and good aging resistance.
The gas discharge tube that this embodiment provided, its polytetrafluoroethylene body is not only mechanical, chemical stability, can guarantee gas discharge tube's structural stability, and the resistant electric arc and the high temperature resistance of polytetrafluoroethylene body in low-voltage system are outstanding, and the voltage protection horizontal stability that can guarantee gas discharge tube is good.
The present embodiment also provides a method for manufacturing a gas discharge tube, the method for manufacturing a gas discharge tube being used for manufacturing the gas discharge tube, the method for manufacturing a gas discharge tube including:
preparing two electrodes 100, and sintering 70% -100% of graphite powder and 0% -30% of titanium dioxide powder to prepare two graphite electron emitters 400;
fixing each graphite electron emitter 400 to the corresponding electrode 100;
in an electronegative gas environment, the two electrodes 100 are fixed by using a mold, and the insulating tube body 200 is formed by pouring liquid epoxy resin or liquid polytetrafluoroethylene on the peripheries of the two electrodes 100.
The manufacturing method of the gas discharge tube provided by the embodiment can avoid the complex operations of cleaning the surface of the electrode 100, modulating the electronic powder, coating the electronic powder coating, drying the electronic powder coating and placing the gas discharge tube in a drying vessel for storage after drying the gas discharge tube in the traditional process, the production process is simple to a great extent, the labor cost is low, the gas discharge tube manufactured by the method has stable low breakdown voltage, and the requirement of an electrical element on the low breakdown voltage can be well met.
In another embodiment of the present application, the step of forming two graphite electron emitters 400 comprises:
uniformly mixing 70-100% of graphite powder and 0-30% of titanium dioxide powder to obtain first mixed powder, and forming the first mixed powder;
and placing the formed first mixed powder in a sintering device for sintering, wherein the sintering temperature is 1500-2000 ℃.
Specifically, the first mixed powder may be formed in various manners, such as by molding or pressing, and may be selected according to the need, and is not limited herein.
The graphite electron emitter 400 manufactured by the manufacturing method of the gas discharge tube is sintered at a proper sintering temperature, has good uniformity of the structure and better electromechanical properties, and is beneficial to maintaining stable breakdown voltage of the gas discharge tube.
In another embodiment of the present application, the step of forming two graphite electron emitters 400 comprises:
uniformly mixing 70-100% of graphite powder and 0-30% of titanium dioxide powder by mass to obtain second mixed powder, and adding a binder into the second mixed powder;
putting the second mixed powder added with the binder into a die to prepare a pressed compact;
placing the pressed blank in a baking device for baking at the temperature of 150-200 ℃.
The binder may be polyethylene oxide or polyvinyl alcohol, and may be selected as needed, which is not limited herein.
The method for manufacturing the gas discharge tube is used for manufacturing the graphite electron emitter 400, so that the fuel consumption is low, the cost is low, and after the graphite electron emitter 400 is baked at a proper temperature, the binder in the graphite electron emitter 400 is completely evaporated, so that the high purity of the insulating gas in the gas discharge tube is favorably kept.
In another embodiment of the present application, fixing each electron emitter to the corresponding electrode 100 includes: punching the emitter of the electrode 100 into the corresponding electrode 100 by using an external machining device; alternatively, the corresponding electrode 100 is cast around the graphite electron emitter 400.
The method for manufacturing a gas discharge tube according to the present embodiment can easily and quickly fix the graphite electron emitter 400 to the corresponding electrode 100, and has high production efficiency and low production cost.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A gas discharge tube, characterized by: the gas discharge tube comprises two electrodes and an insulating tube body, wherein the insulating tube body is used for enclosing the two electrodes to form an accommodating cavity, the accommodating cavity is used for accommodating insulating gas, and a graphite electron emitter is fixedly arranged on the surface of the electrode, which is located in the accommodating cavity.
2. The gas discharge tube of claim 1, wherein: the surface of the electrode, which is positioned in the accommodating cavity, is provided with a concave part, and the corresponding graphite electron emitter is fixedly embedded in the concave part.
3. The gas discharge tube of claim 1, wherein: and convex parts are arranged on the surface of the electrode, which is positioned in the accommodating cavity, and the corresponding graphite electron emitter is fixedly arranged on the convex parts.
4. The gas discharge tube of claim 3, wherein: the corresponding graphite electron emitter covers the convex portion.
5. The gas discharge tube of claim 1, wherein: the insulating gas in the accommodating cavity is electronegative gas.
6. The gas discharge tube of claim 5, wherein: the containing cavity is used for containing carbon tetrafluoride gas.
7. The gas discharge tube of claim 5, wherein: the accommodating cavity is used for sulfur hexafluoride gas.
8. The gas discharge tube of claim 6 or 7, wherein: the pressure of the electronegative gas in the accommodating cavity is-70 kpa to 80 kpa.
9. The gas discharge tube of claim 1, wherein: the insulating pipe body is a polytetrafluoroethylene pipe body.
10. The gas discharge tube of claim 1, wherein: the insulating pipe body is an epoxy resin pipe body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120831021.3U CN215299780U (en) | 2021-04-21 | 2021-04-21 | Gas discharge tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120831021.3U CN215299780U (en) | 2021-04-21 | 2021-04-21 | Gas discharge tube |
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| Publication Number | Publication Date |
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| CN215299780U true CN215299780U (en) | 2021-12-24 |
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| CN202120831021.3U Active CN215299780U (en) | 2021-04-21 | 2021-04-21 | Gas discharge tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022222211A1 (en) * | 2021-04-21 | 2022-10-27 | 深圳市瑞隆源电子有限公司 | Gas discharge tube and manufacturing method therefor |
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2021
- 2021-04-21 CN CN202120831021.3U patent/CN215299780U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022222211A1 (en) * | 2021-04-21 | 2022-10-27 | 深圳市瑞隆源电子有限公司 | Gas discharge tube and manufacturing method therefor |
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