CN110323112B - Gas discharge device capable of bearing current and electric arc - Google Patents
Gas discharge device capable of bearing current and electric arc Download PDFInfo
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- CN110323112B CN110323112B CN201910702206.1A CN201910702206A CN110323112B CN 110323112 B CN110323112 B CN 110323112B CN 201910702206 A CN201910702206 A CN 201910702206A CN 110323112 B CN110323112 B CN 110323112B
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- 238000010891 electric arc Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 70
- 239000011261 inert gas Substances 0.000 claims abstract description 52
- 230000000903 blocking effect Effects 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 abstract description 13
- 230000015556 catabolic process Effects 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- 239000001307 helium Substances 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 229910052704 radon Inorganic materials 0.000 description 2
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241001085205 Prenanthella exigua Species 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
- H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuses (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting a load from short circuit. According to the invention, the inert gas with low ionization potential is filled in the sealed space outside the electrode and the protective component, so that the original lightning current passing capacity is improved, and the lightning current exceeding the bearing capacity normally passes without damaging the protective component.
Description
Technical Field
The invention belongs to the technical field of circuit protection, and particularly relates to a gas discharge device capable of bearing current and electric arc.
Background
The fuse is an electric appliance which fuses a melt by heat generated by the fuse when a current exceeds a predetermined value. The fuse is widely applied to high-low voltage distribution systems, control systems and electric equipment, is used as a protector for short circuit and overcurrent, and is one of the most common protection devices.
The fuse is protected by Joule thermal fusing generated by the body resistance to the passing current, and the fuse is ensured to be under the impact of lightning current (I) max Or I imp ) Not fusing, ir 2 t (actual melting heat value) must be smaller than If 2 t (nominal melting heat value). The material of the fuse determines the fusing temperature and fusing speed of the fuse link, has no selective fusing capability on the current property, and only reaches the same Ir for lightning current and power frequency current 2 t will blow, which is why the fuse cannot withstand large impact currents.
The fuse is connected in series in the electronic circuit, and is only equivalent to one wire in normal operation, so that the fuse can be stably conducted for a long time to bear rated current; when current fluctuation occurs due to power supply or external interference, a certain range of overload should be borne; the fuse acts only when a large overload current (fault or short circuit) occurs in the circuit, and the safety of the circuit is protected by breaking the current.
When the fuse passes through lightning current, the fuse is extremely easy to fuse, and the electrical equipment stops working.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a gas discharge device capable of bearing current and electric arc.
The technical scheme adopted by the invention is as follows:
a gas discharge device capable of carrying current and electric arc is used for being arranged between a power supply and a load and used as a device for protecting load from short circuit, and comprises electrodes at two ends and a protecting part arranged between the electrodes, wherein a closed space for wrapping the protecting part is arranged between the electrodes, and inert gas is filled in the closed space
First, the present invention is a circuit protection mechanism, and is a special gas discharge tube with fuse or other protection structure. The two ends are symmetrically arranged electrode structures and are used for connecting a power supply and a load circuit in series. The protection part arranged in the middle is directly connected with the electrode, and after the current is electrified, the current enters the fuse wire through one end electrode and flows out from the other end electrode. The electrode is used as an external connection device, belongs to a structure commonly used in the existing similar structure, and is considered as an essential technical feature. It should be noted that, if the electrode structure has the same core structure as the technology of the present application, but is not limited to a specific electrode structure, for example, the fuse is directly connected to one end of the load or one end of the power supply, but there is a sealed space where inert gas wraps the fuse and a structure where a discharge phenomenon may occur, the electrode structure also falls into the protection scope of the present application.
The invention is that a closed space is arranged around the protective structure and is filled with inert gas. The lightning current protection device has the main effects of reducing the gas ionization potential in the cavity between the two electrode structures, so that when lightning current with higher voltage passes through, the lightning current can be directly discharged from the two electrodes to break down, and the lightning current passes through an inert gas space, thereby avoiding damage to the protection component caused by lightning current impact and ensuring that the protection component can continuously work after the whole device passes through the lightning current.
The protective component not only comprises a fuse structure, but also comprises a plurality of circuit protective conductor structures, current only flows through the protective component under normal-pressure working current, and once pulse current appears, the instantaneous voltage is increased to the breakdown voltage, and the current breaks down inert gas to generate discharge.
Inert gas is a general term of colorless and odorless monoatomic gas, has extremely stable chemical properties, and is difficult to carry out chemical reaction. Is generally used as a protective gas to prevent the target from being deteriorated by contact with oxygen. Among them, helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn, radioactivity) and the like are commonly used in electric lamps except that radon gas having radioactivity at last does not have a large application range, and a bulb filled with inert gas generates bright white light when discharged at both poles and has a low breakdown voltage, so that the bulb is often used as a filling medium of the bulb. The invention also uses the low ionization potential characteristic of inert gas to fill the inert gas between the two end electrodes, which not only can play a role in wrapping the anti-rust effect of the fuse wire, but also mainly provides an air charging space with low breakdown voltage, so that when the lightning current with high voltage passes through the fuse wire, the lightning current can be directly used as a main connection mode in a breakdown discharging mode, thereby avoiding the influence on the fuse wire.
The common inert gases are neon and argon, the ionization potential of the inert gases is reduced more than that of helium, the total cost is relatively low, and the inert gases can be filled into a closed space as a medium to play a good role in guiding.
It should be noted that the filling gas is generally an inert gas, which has a better electrical stability, but in practice the filling gas should be understood to include all gases having a better electrical stability and a lower breakdown voltage, since this is a technical means known to those skilled in the art. It is within the scope of the invention if other gases of the same function or similar properties are present instead, if not inert gases.
Further, a discharge structure is arranged on one side of the electrode facing the main body of the protection component. The so-called discharge is that a gas filled between two conductors is ionized to form a conductor due to a strong electric field strength in a space filled with the gas, thereby forming a current in the space. However, since the discharge structure is provided on the inner surface of the electrode in order to guide the discharge, the original discharge end surface area is reduced, which is a point discharge method.
And the tip discharge is that the end surface area between the conductors is reduced, so that the electric field at the tip of the conductor is strongest, and lightning current is led to form a discharge phenomenon between discharge structures at two ends. In this application, a scheme without a discharge structure is also included, because an inert gas filled in a sealed space is formed between two electrodes, and when the voltage is higher than the breakdown voltage, a discharge phenomenon occurs, and the discharge structure is a structure for guiding an arc, which is an optimization mode.
Further, the discharge structure is a plurality of interval structures which are annularly arranged and outwards protruded. In consideration of the existing discharge structure, the discharge structure may be provided as a plurality of columnar or stripe-shaped protrusion structures, and a discharge current is generated between the discharge structures of the two electrodes.
Further, the discharge structure is a continuous annular structure protruding outwards. The continuous circular ring structure is a homogeneous annular bulge structure, so that the current is guided to discharge at any point on the annular end surface on the basis of reducing the end surface area, and the continuous circular ring structure is not limited to a single-point discharge mode. The specific location may be varied, for example, the axis of the annular protrusion may be collinear with the axis of the entire gas discharge device, or may be non-collinear, or may be located on one side.
Further, the protection component comprises one or more of a fuse wire, a TVS tube, a piezoresistor, an inductance coil and an insulation tube. If the gas discharge device is in a plurality of combination forms, a plurality of gas discharge devices are generally connected in parallel in the whole gas discharge device, or are mainly connected in parallel, and a single branch is provided with a plurality of devices in series, so that a plurality of different protection effects are realized.
Further, a sealed cavity is formed in the fuse, blocking gas with ionization potential higher than that of inert gas filled in the sealed space is filled in the cavity, and when the fuse is fused, the blocking gas enters the sealed space to improve the ionization potential of the gas in the space, so that electrodes at two ends cannot be discharged normally.
In the actual use process, the fuse can be effectively prevented from being damaged when lightning passes through, which exceeds the bearing capacity of the fuse, through the increased inert gas sealed space, but the original discharge structure still exists after the fuse is disconnected due to the occurrence of power frequency current. And the maintenance personnel need a certain time to change the equipment, if lightning current is discharged through inert gas between two electrodes in the time before the replacement of the fuse, the lightning current can smoothly pass through the circuit which is originally formed to be broken, and the subsequent protection equipment connected with the lightning current is easy to be damaged due to the fact that the subsequent protection equipment does not work or loses on-off capability.
In order to avoid the problem, the invention optimizes and improves the fuse structure, and is internally provided with a single cavity structure which comprises a plurality of forms, wherein the cavity structure is hollowed out in the original homogeneous material to form a thin-wall cavity structure, or the cavity is arranged in the fuse structure on the basis of keeping the solid cross-sectional area of the raw material unchanged. The two cavity structures have different morphological characteristics, wherein the thin-wall cavity structure is fused at the thin wall part of the thin-wall cavity structure with high probability, so that the cavity structure is not required to be uniformly arranged inside the whole fuse wire and only needs to be in a closed space. When the fuse wire is fused, the gas with higher ionization potential in the thin-wall cavity can rapidly leak out and destroy the original inert gas system, so that the ionization potential of the original gas is greatly improved, and the lightning current which can pass through the fuse wire in a discharging mode can not break down the gas, so that the breaking stability is improved.
In order to avoid the situation that the fusing part is just not contacted with the cavity, a strip-shaped cavity structure can be adopted and extends to the position close to the two ends of the electrode, so that the gas is rapidly released to destroy the original gas system when the electrode is fused.
It is worth to say that the invention includes the scheme without cavity structure, because it mainly solves the situation that causes the trouble of the protective component to happen when thunder and lightning passes through, but the above-mentioned scheme is the technical content of further improvement optimization, can optimize the performance on the basis of the original scheme, but its original scheme without cavity structure can solve the technical problem too.
Further, the blocking gas is air or oxygen. Generally, air is used as blocking gas, so that the cost is low, and the air blocking effect is good.
Further, the fuse wire also comprises a shell which is connected with the electrodes at two ends and forms a closed space. The shell is of a fully-wrapped structure made of insulating materials, is generally made of tubular glass or ceramic materials, and has good high-temperature resistance and insulating performance.
Further, the electrode is provided with an inward sunken sink at the middle part of the end surface far away from one side provided with the discharge structure, and a through hole for installing the fuse is arranged in the center of the sink.
Further, the fuse wire is externally wrapped with an insulating layer. The insulating layer is a structure for protecting the fuse from being broken by discharge current, and is generally a homogeneous insulating bushing structure.
The beneficial effects of the invention are as follows:
1. according to the invention, the inert gas with low ionization potential is filled in the sealed space outside the electrode and the protective component, so that the original lightning current passing capacity is improved, and the lightning current exceeding the bearing capacity normally passes without causing the fault and disconnection of the protective component;
2. the inner sides of the electrodes at the two ends of the invention are provided with the discharge structures for guiding lightning current discharge, and the tip discharge is carried out through the discharge structures, so that the original breakdown current can carry out the breakdown discharge in a specific area;
3. according to the invention, through the hollow fuse structure, the independent cavity structure is arranged in the hollow fuse, when the fuse is fused, the gas with higher ionization potential in the thin-wall cavity can rapidly leak out and destroy the original inert gas system, so that the ionization potential of the original gas is greatly improved, and the lightning current which can pass through in a discharging mode can not break down the gas, so that the breaking stability is improved.
Drawings
FIG. 1 is an axial side perspective view of the present invention;
FIG. 2 is a schematic view of a three-dimensional exploded structure of the present invention;
FIG. 3 is a side view of the present invention as a parent of the following cross-sectional schematic;
FIG. 4 is a schematic cross-sectional view of the present invention taken along line B-B of FIG. 3;
figure 5 is a schematic cross-sectional view of the invention of figure 3 blocking gas from entering the enclosed space after the fuse has blown.
In the figure: 1-shell, 2-electrode, 3-fuse, 31-cavity, 4-sink, 5-insulating layer and 6-discharge structure.
Detailed Description
The invention is further illustrated by the following description of specific embodiments in conjunction with the accompanying drawings.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, if the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship that a product of the application conventionally puts in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like in the description of the present application, if any, are used for distinguishing between the descriptions and not necessarily for indicating or implying a relative importance.
Furthermore, the terms "horizontal," "vertical," and the like in the description of the present application, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Example 1:
the conventional fuse is generally filled with inorganic insulating materials such as quartz sand around the fuse, mainly to improve heat dissipation capability. Because the fuse can generate heat when passing through the current, the fuse is fused in order to avoid the situation that the heat accumulation is caused by untimely heat dissipation although the passing current does not reach the overload current value. However, the heat dissipation material has an upper capacity limit, and if the lightning current voltage and current are too high, even if the current passes through the current extremely, the fuse can be heated and blown, or other protection components are in fault, a certain risk still exists. The embodiment is a fusing mechanism, as shown in fig. 1-3, specifically a gas discharge device capable of carrying current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting a load from short circuit, and comprises electrodes 2 at two ends and a protecting component arranged between the electrodes 2, wherein a sealed space for wrapping the protecting component is arranged between the electrodes 2, and the sealed space is filled with an electrode 2 structure with inert gas, the two ends of which are symmetrically arranged, and the electrode 2 structure is used for connecting the power supply and the load circuit in series.
The conductors in the gas discharge device are two electrodes 2 and a protective component, two circuits are arranged between the electrodes 2, one of the two circuits is the protective component, and the other is inert gas. While the inert gas is in an open circuit in a normal operating current conducting state, and current only passes through the protection component. When the pulse current is generated and the instantaneous high voltage passes, the inert gas can be broken down to discharge, and the two circuits are connected in parallel in the state.
The protection part arranged in the middle is directly connected with the electrode 2, and after the current is electrified, the current enters the fuse wire 3 through one end electrode 2 and flows out from the other end electrode 2.
Therefore, in this embodiment, a closed space is provided around the protective member and filled with an inert gas. The main function of the device is to reduce the ionization potential of the gas in the cavity 31 between the two electrode 2 structures, so that when lightning current with higher voltage passes through, the lightning current can be directly discharged from the two electrodes 2 to break down, and the lightning current passes through an inert gas space, thereby avoiding damage to the protection component caused by lightning current impact and ensuring that the protection component can continuously work.
In this embodiment, the inert gas is filled between the electrodes 2 at both ends by using the characteristic of low ionization potential of the inert gas, so that the anti-rust effect is achieved, and an inflatable space with low breakdown voltage is mainly provided, so that when the lightning current with high voltage passes through the protection component, the lightning current can be directly used as a main connection mode in a breakdown discharging manner, and the influence on the protection component is avoided.
Example 2:
the embodiment is a fusing mechanism, in particular to a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting load short circuit, and comprises electrodes 2 at two ends and piezoresistors arranged between the electrodes 2, wherein a closed space for wrapping the piezoresistors is arranged between the electrodes 2, and inert gas is filled in the closed space. The two ends are symmetrically arranged electrode 2 structures, which are used for connecting a power supply and a load circuit in series. The piezoresistor arranged in the middle is directly connected with the electrode 2, and after the energizing, the current enters the piezoresistor through one end electrode 2 and flows out from the other end electrode 2.
In this embodiment, a closed space is provided around the varistor and filled with inert gas. The main function of the device is to reduce the ionization potential of the gas in the cavity between the two electrode 2 structures, so that when lightning current with higher voltage passes through the device, the lightning current can be directly discharged from the two electrodes 2 to break down, and the lightning current passes through an inert gas space, thereby avoiding the voltage dependent resistor from being damaged by lightning current surge and keeping the voltage dependent resistor continuously working.
Example 4:
the embodiment is a fusing mechanism, in particular to a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting load short circuit, and comprises electrodes 2 at two ends and an inductance coil arranged between the electrodes 2, wherein a closed space for wrapping the inductance coil is arranged between the electrodes 2, and inert gas is filled in the closed space. The two ends are symmetrically arranged electrode 2 structures, which are used for connecting a power supply and a load circuit in series. The inductance coil arranged in the middle is directly connected with the electrode 2, and after the current is electrified, the current enters the inductance coil through one end electrode 2 and flows out from the other end electrode 2.
In this embodiment, a closed space is provided around the inductance coil and is filled with an inert gas. The main function of the device is to reduce the ionization potential of the gas in the cavity between the two electrode 2 structures, so that when lightning current with higher voltage passes through the device, the lightning current can be directly discharged from the two electrodes 2 to break down, and the lightning current passes through an inert gas space, thereby avoiding the damage of the inductance coil caused by lightning current surge and keeping the inductance coil continuously working.
Example 5:
the embodiment is a fusing mechanism, in particular to a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting load from short circuit, and comprises electrodes 2 at two ends and a fuse 3 arranged between the electrodes 2, wherein a closed space for wrapping the fuse 3 is arranged between the electrodes 2, and inert gas is filled in the closed space. The two ends are symmetrically arranged electrode 2 structures, which are used for connecting a power supply and a load circuit in series. The fuse 3 arranged in the middle is directly connected with the electrode 2, and after being electrified, current enters the fuse 3 through one end electrode 2 and flows out from the other end electrode 2.
In this embodiment, a closed space is provided around the fuse 3 and filled with an inert gas. The main function of the device is to reduce the ionization potential of the gas in the space between the two electrode 2 structures, so that when the lightning current with higher voltage passes through, the lightning current can be directly discharged from the two electrodes 2 to break down, and the lightning current passes through the inert gas space, thereby avoiding the fuse from being damaged by the impact of the lightning current and keeping the fuse 3 continuously working.
While the inert gas in this embodiment is argon.
Example 6:
the embodiment is a fusing mechanism, in particular to a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting load from short circuit, and comprises electrodes 2 at two ends and a fuse 3 arranged between the electrodes 2, wherein a closed space for wrapping the fuse 3 is arranged between the electrodes 2, and inert gas is filled in the closed space. The two ends are symmetrically arranged electrode 2 structures, which are used for connecting a power supply and a load circuit in series. The fuse 3 arranged in the middle is directly connected with the electrode 2, and after being electrified, current enters the fuse 3 through one end electrode 2 and flows out from the other end electrode 2.
While the inert gas in this embodiment is a mixed gas of argon and helium.
Example 7:
the embodiment is a fusing mechanism, in particular to a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting load from short circuit, and comprises electrodes 2 at two ends and a fuse 3 arranged between the electrodes 2, wherein a closed space for wrapping the fuse 3 is arranged between the electrodes 2, and inert gas is filled in the closed space. The two ends are symmetrically arranged electrode 2 structures, which are used for connecting a power supply and a load circuit in series. The fuse 3 arranged in the middle is directly connected with the electrode 2, and after being electrified, current enters the fuse 3 through one end electrode 2 and flows out from the other end electrode 2.
The electrode 2 protrudes outwards towards the body side of the fuse 3 to form a discharge structure. The discharge structures are a plurality of interval structures which are annularly arranged and outwards protruded.
Example 8:
the embodiment is a fusing mechanism, in particular to a gas discharge device capable of bearing current and electric arc, which is used for being arranged between a power supply and a load and used as a device for protecting load from short circuit, and comprises electrodes 2 at two ends and a fuse 3 arranged between the electrodes 2, wherein a closed space for wrapping the fuse 3 is arranged between the electrodes 2, and inert gas is filled in the closed space.
The two ends are symmetrically arranged electrode 2 structures, which are used for connecting a power supply and a load circuit in series. The fuse 3 arranged in the middle is directly connected with the electrode 2, and after being electrified, current enters the fuse 3 through one end electrode 2 and flows out from the other end electrode 2. The electrode 2 protrudes outwards towards the body side of the fuse 3 to form a discharge structure.
The discharge structure is a continuous annular structure which continuously protrudes outwards, and the center of the continuous annular structure is coincident with the axis of the fuse wire 3. The continuous annular structure is a homogeneous annular convex structure, so that the current is guided to discharge at any point on the annular end surface on the basis of reducing the end surface area, and the continuous annular structure is not limited to a single-point discharge mode.
Example 9:
the embodiment discloses a gas discharge device capable of carrying current and arc, as shown in fig. 4 and 5, which comprises a tubular shell 1, wherein the shell 1 is made of insulating ceramic materials, two ends of the shell 1 are circular openings with the same size and shape, and each opening is independently provided with an electrode 2.
The electrode 2 is of a cylindrical structure, clamping rings are arranged on the outer side surface of the electrode 2 in an extending mode, the shell 1 is directly arranged between the clamping rings, and the clamping rings are in contact with the opening end face of the shell 1 to form sealing connection. And a coaxial fuse wire 3 structure is also arranged in the shell 1, and the fuse wire 3 is connected with the electrodes 2 at two ends to form an electric conductor.
The fuse 3 is internally provided with a sealed cavity 31, blocking gas with ionization potential higher than that of inert gas filled in the sealed space is filled in the cavity 31, and when the fuse 3 is fused, the blocking gas enters the sealed space to improve the ionization potential of the gas in the space, so that the electrodes 2 at two ends cannot be normally discharged.
The cavity 31 structure is a thin-wall cavity 31 structure formed by hollowing out in an original homogeneous material, and the thin-wall cavity 31 structure is fused at the thin wall part of the thin-wall cavity 31 with high probability, so that the cavity 31 structure is not required to be uniformly arranged in the whole fuse wire 3 and only needs to be in a closed space. When the fuse 3 is fused, the gas with higher ionization potential in the thin-wall cavity 31 can rapidly leak out and destroy the original inert gas system, thereby greatly improving the ionization potential of the original gas, and the lightning current which can pass through the discharge mode can not break down the gas, so as to improve the breaking stability.
Wherein the blocking gas is air. Generally, air is used as blocking gas, so that the cost is low, and the air blocking effect is good.
The electrode 2 is provided with an inward sunken sink 4 in the middle of the end surface far away from one side provided with the discharge structure, and a through hole for installing the fuse wire 3 is arranged in the center of the sink 4. The fuse 3 is externally wrapped with an insulating layer 5. The insulating layer 5 is a structure for protecting the fuse 3 from being damaged by an electric shock by a discharge current, and is generally a uniform rubber bushing structure.
When the passing lightning current value is smaller than In/Ie <0.5 and the fuse is In the bearing capacity, the lightning current smoothly passes through the fuse; when the lightning current value is greater than the fuse carrying capacity (In/Ie > 0.5), the ohmic voltage caused by the lightning current exceeds the ohmic voltage applied to the both-end electrodes.
An uneven electric field is generated between the annular flanges of the two poles, discharge breakdown occurs between the two poles, and lightning current passes through an inert gas space, so that the fuse is prevented from being damaged by lightning current impact, and the fuse is kept to work continuously.
Example 10:
in this embodiment, the optimization and limitation are performed on the basis of the above embodiment 6, wherein the cavity 31 is configured inside the original fuse 3 on the basis of the unchanged solid cross-sectional area of the raw material, so that in order to avoid the situation that the fusing part is just not in contact with the cavity 31, the elongated cavity 31 may be used, and the structure extends until the structure is close to the two end electrodes 2, so that the gas is released rapidly to destroy the original gas system when the fuse is fused.
During installation, the fuse wire 3 is connected with one side electrode 2, the side electrode 2 is inserted into an opening on one side of the shell 1, then the other side electrode 2 is aligned to be inserted into and connected with the fuse wire 3 in an installation mode, the electrodes 2 on two sides are directly welded with the shell 1 in a silver welding mode, one side opening is reserved to be filled with inert gas, and after the whole airtight space is completely filled with the inert gas and overflows, the opening is sealed to form a complete airtight space.
The embodiment carries out experimental test on the product, and is divided into two steps, wherein the first step carries out pulse current test on the product of the embodiment, and compares the pulse current test with the common insurance tube in the existing market; the second step is to continue to test the on-off condition of the product of the embodiment after the fuse wire 3 is fused.
The comparison test selects a general fuse tube in the existing market, the specification of the general fuse tube is 2A (5 x 20, 250V), the lightning surge current waveform of 8/20us is tested, the impact current is continuously increased, and the experimental result is as follows:
from the above experimental results, the conventional 2A universal fuse tube was blown under the lightning current surge of 0.91kA, but the fuse tube of the present embodiment was not opened until the surge current reached 30.1 kA. The fuse of this embodiment in this table performs the same current passing test as the general fuse under the same conditions, except that the corresponding test result is not shown in this table because no fusing phenomenon occurs when the current passes between cells.
In the second step of experiment, the product of the embodiment after being melted is used as a sample for testing, and the product is found to be in the state of being broken under the lightning current impulse of 0-40kA, so that the air originally in the cavity enters the closed space to destroy the original inert gas system.
The invention is not limited to the alternative embodiments described above, but any person may derive other various forms of products in the light of the present invention. The above detailed description should not be construed as limiting the scope of the invention, which is defined in the claims and the description may be used to interpret the claims.
Claims (8)
1. A gas discharge device capable of carrying current and an arc for placement between a power source and a load as a load short circuit protection device, characterized by: the electrode assembly comprises electrodes (2) at two ends and a protection part arranged between the electrodes (2), wherein a closed space for wrapping the protection part is arranged between the electrodes (2), and inert gas is filled in the closed space;
the protection component comprises one or more of a fuse wire (3), a TVS tube, a piezoresistor, an inductance coil and an insulation tube;
a sealed cavity (31) is arranged in the fuse wire (3), blocking gas with ionization potential higher than that of inert gas filled in the sealed space is filled in the cavity (31), and when the fuse wire (1) is fused, the blocking gas enters the sealed space to improve the gas ionization potential in the space, so that the electrodes (2) at two ends cannot be normally discharged;
the protection part arranged in the middle is directly connected with the electrode (2), and after being electrified, current enters the fuse wire (3) through one end electrode (2) and flows out from the other end electrode (2).
2. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 1, wherein: the electrode (2) is provided with a discharge structure (6) towards the body side of the protection component.
3. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 2, wherein: the discharge structure (6) is a continuous ring structure protruding outwards.
4. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 2, wherein: the discharge structure is a plurality of interval structures which are annularly arranged and outwards protruded.
5. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 1, wherein: the blocking gas is air or oxygen.
6. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 1, wherein: the fuse wire also comprises a shell (1) which is connected with the electrodes (2) at the two ends and wraps the fuse wire (3) to form a closed space.
7. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 6, wherein: the electrode (2) is provided with an inward sunken sink (4) at the middle part of the end surface far away from one side provided with a discharge structure, and a through hole for installing the fuse wire (3) is arranged in the center of the sink (4).
8. A gas discharge device capable of carrying an electric current and an electric arc as claimed in claim 1, wherein: the outside of the protection part is wrapped with an insulating layer (5).
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| CN201910702206.1A CN110323112B (en) | 2019-07-31 | 2019-07-31 | Gas discharge device capable of bearing current and electric arc |
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| CN110323112B true CN110323112B (en) | 2024-03-19 |
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| CN111541229A (en) * | 2020-03-27 | 2020-08-14 | 北京捷安通达科贸有限公司 | Signal protection device for motorized field electronic equipment |
| CN115692127A (en) * | 2022-11-23 | 2023-02-03 | 国网浙江省电力有限公司温州市洞头区供电公司 | A pagoda type fully insulated fuse |
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| CN209912827U (en) * | 2019-07-31 | 2020-01-07 | 厦门大恒科技有限公司 | Gas discharge structure capable of bearing current and electric arc |
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| TW200937479A (en) * | 2008-02-19 | 2009-09-01 | Chun-Chang Yen | An overcurrent protection device structure, and its manufacturing method and device |
| CN101527235A (en) * | 2008-03-06 | 2009-09-09 | 颜琼章 | Overcurrent protection device and method for manufacturing the same |
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