CN216355294U - Arc extinguishing device bearing high-strength pressure seal - Google Patents
Arc extinguishing device bearing high-strength pressure seal Download PDFInfo
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- CN216355294U CN216355294U CN202121850963.2U CN202121850963U CN216355294U CN 216355294 U CN216355294 U CN 216355294U CN 202121850963 U CN202121850963 U CN 202121850963U CN 216355294 U CN216355294 U CN 216355294U
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Abstract
The utility model discloses an arc extinguishing device bearing high-strength pressure seal, which belongs to the technical field of lightning protection and arc extinguishing and comprises a plastic sleeve, a steel sleeve, a ceramic tube, arc extinguishing insulating liquid, a conductive electrode and sealing silica gel. The electric arc is discharged in liquid to generate a liquid-electric effect to form an impact pressure wave, the impact electric arc is immediately cut off when being formed, the high voltage in the ceramic tube destroys a continuous discharge condition and a reignition condition, the reignition breakdown time is greatly delayed by more than ten to dozens of microseconds after the impact electric arc is cut off, an arc extinguishing current interruption mechanism is optimized, the generated pressure wave is focused to one point on an arc extinguishing channel, and higher pressure is generated at a focus.
Description
Technical Field
The utility model relates to the technical field of lightning protection and arc extinction, in particular to an arc extinction device bearing high-strength pressure seal.
Background
When the existing arc extinguishing lightning protection device is struck by lightning, because the arc extinguishing process can produce transient high energy impact, the existing arc extinguishing lightning protection device is possibly insufficient in air tightness, hundreds of megaPascals of high strength pressure generated by arc extinguishing act on an arc extinguishing cylinder, mechanical deformation occurs, the whole arc extinguishing device is exploded, and the reached arc extinguishing lightning protection effect is unsatisfactory.
According to the arc extinguishing structure of the insulating liquid seal designed according to the requirement, because when the electric arc is conducted, a large shock wave pressure can be formed, if the internal liquid seal is not good, the liquid leakage condition can often occur, and therefore, a sealing device capable of bearing the pressure is required to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an arc extinguishing device bearing high-strength pressure seal, and solves the technical problems mentioned in the background. When realizing the quick extinguishing of long electric arc, improve the sealed security of device, prevent that arc extinguishing lightning protection device from being destroyed, improve the stability and the reliability of arc extinguishing, realize effective arc extinguishing.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a bear sealed arc control device of high strength pressure, includes plastic cover, steel bushing, ceramic pipe, arc extinguishing insulating liquid, conducting electrode, sealing silica gel, and the conducting electrode nestification is in sealing silica gel, and sealing silica gel seals the both ends that set up at ceramic pipe, and the steel bushing fastening is in the outside of sealing silica gel and the junction of ceramic pipe, and arc extinguishing insulating liquid sets up in ceramic pipe, and the plastic ways is established in the outside of steel bushing and ceramic pipe.
Further, above-mentioned scheme still includes stainless steel packing ring and O-ring, and the stainless steel packing ring pad is established at the front end of conducting electrode, and the O-ring setting is between sealed silica gel and ceramic pipe contact department.
Further, above-mentioned scheme still includes the extrusion fixed block, and the extrusion fixed block setting is provided with the bolt hole in the outside of sealing silica gel on the extrusion fixed block, and the bolt hole sets up with the contact of stainless steel packing ring.
Furthermore, the sealing silica gel is arranged to be a T-shaped structure silica gel, and the bottom of the T-shaped structure silica gel is arranged to be a spherical concave structure.
Furthermore, the conductive electrode is set to be a T-shaped structure electrode, the upper end of the T-shaped structure electrode is set to be a metal block, the lower end of the T-shaped structure electrode is set to be a graphite rod, and the graphite rod is fixedly connected with the metal block.
Furthermore, the working process of the arc-extinguishing device is as follows,
step 1: before lightning is formed, because of electrostatic induction, charges with polarity opposite to that of thundercloud are induced in the insulating tube and accumulated in the sealed insulating tube, and because liquid is incompressible fluid, the charges cannot move freely, and finally an arc chain is formed in the insulating tube; mutually repulsive coulomb force is generated among the charges with the same polarity, and the coulomb force acts on the pipe wall to form reaction force due to the sealing of the insulating pipe, so that the induced charge chain is cut off;
step 2: when arc discharge is initiated in the sealed tube filled with insulating oil, shock waves towards the side edges are generated by the liquid electricity effect;
and step 3: the Pascal effect enhances the liquid electric effect, when electric arcs act on the insulating oil, when a certain part of static insulating oil generates pressure intensity change, the electric arcs constantly transmit the pressure intensity to all directions of the inner side of the sealing pipe;
and 4, step 4: impact waves of the liquid-electricity effect and the Pascal effect return to impact after impacting the side edges, the two ends are arranged to be spherical concave surfaces, pressure waves are focused at the focus, the pressure of the impact waves is increased, the impact arc extinguishing is carried out on the arc channel in a centralized mode, and overvoltage protection is carried out.
Further, the specific process of step 2 is that arc discharge is initiated in the ceramic tube filled with insulating oil, part of the insulating oil in the discharge channel is instantly vaporized, decomposed and ionized into high-temperature plasma and suddenly expanded to form a mechanical pressure wave which rapidly propagates outwards, but since the liquid can be regarded as a shock wave transmission medium which is not compressed, a mechanical effect of power is shown to the outside when liquid-phase discharge is performed in the discharge channel, an acting force which impacts the wall of the ceramic tube is formed in the ceramic tube, and the wall of the ceramic tube generates a shock wave in the insulating oil medium due to the interaction of the forces.
Further, the specific process of step 3 is that when the impact arc acts on the metal electrode to apply pressure to the insulating oil in the ceramic tube, according to the pascal principle, a certain part of the static fluid in the closed container generates pressure variation, the pressure is constantly transmitted to all directions, then the insulating oil medium around is impacted by a larger acting force from the discharge channel in the ceramic tube, and the acting force rebounds after contacting the wall of the ceramic tube.
Further, the specific process of step 4 is that the pressure in the ceramic tube is increased and the temperature is increased by the liquid electric effect and the pascal effect, so that an acting force pointing to the center from the ceramic tube wall is generated, under the acting force, the arc moves towards the tip of the arc-extinguishing grid, the tip lengthens the length of the arc, and under the blowing of the insulating oil to the arc, the temperature of the arc is reduced, so that the arc is extinguished more rapidly, the longer the arc formed in the ceramic tube is, the greater the acting force is on the ceramic tube wall, and conversely, the greater the impact force for cutting the arc is, the rebounding occurs after the acting force acts on the shell, so that the acting force pointing to the center of the insulating tube is formed, the arc is cut, the current amplitude and the steepness are reduced, and the counterattack voltage is avoided and the induced lightning overvoltage is reduced.
Further, the specific process of the step 4 is that the pressure wave is focused at the focus, and the specific process that the pressure wave is reflected by the ceramic pipe wall, focused at the focus through the paraboloid and generates larger pressure at the focus, so that the electric arc is cut off when the amplitude of the lightning current is small, and the electric field is reduced and the arc establishment rate is reduced due to the existence of the breakpoint.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
the electric arc is discharged in liquid to generate a liquid-electric effect, an impact pressure wave is quickly formed, the impact electric arc is immediately cut off when being formed, the high voltage in the ceramic tube destroys a continuous discharge condition and a reignition condition, the reignition breakdown time is greatly delayed by more than ten microseconds to more than dozens of microseconds after the impact electric arc is cut off, the gradient of lightning current is remarkably reduced by 90 percent, the amplitude of current is attenuated by more than 50 percent, an arc-extinguishing current interruption mechanism is optimized, the generated pressure wave is focused to one point on an arc-extinguishing channel, greater pressure is generated at a focus, the interruption capability is stronger, the structure is simple, and the sealing performance is good.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the drawings, 1: plastic cover; 2: a stainless steel washer; 3: an O-ring; 4: steel jacket; 5: a ceramic tube; 6: an arc-extinguishing insulating liquid; 7: a conductive electrode; 8: sealing the silica gel; 9: extruding the fixed block; 10: bolt holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in fig. 1, an arc extinguishing device bearing high-strength pressure seal comprises a plastic sleeve 1, a steel sleeve 4, a ceramic tube 5, arc extinguishing insulating liquid 6, a conductive electrode 7 and sealing silica gel 8, wherein the conductive electrode 7 is nested in the sealing silica gel (8), the sealing silica gel 8 is hermetically arranged at two ends of the ceramic tube 5, the steel sleeve 4 is fastened at the outer side of the joint of the sealing silica gel 8 and the ceramic tube 5, the arc extinguishing insulating liquid 6 is arranged in the ceramic tube 5, and the plastic sleeve 1 is sleeved at the outer sides of the steel sleeve 4 and the ceramic tube 5. Still include stainless steel packing ring 2 and O type ring 3, stainless steel packing ring 2 fills up and establishes at the front end of conducting electrode 7, and O type ring 3 sets up between 8 and the ceramic pipe 5 contact departments of sealed silica gel. Still include extrusion fixed block 9, extrusion fixed block 9 sets up in the outside of sealing silica gel 8, is provided with bolt hole 10 on the extrusion fixed block 9, and bolt hole 10 sets up with the contact of stainless steel packing ring 2.
The ceramic tube filled with the arc extinguishing liquid is made of high-hardness, high-temperature-resistant and high-pressure-resistant inorganic non-metallic materials and is cylindrical; the shell is made of plastic insulating materials and is used for fixing the ceramic tube; the steel sleeves are arranged at two ends of the ceramic tube to fix the end part of the ceramic tube and prevent the ceramic tube from being mechanically deformed by the generated high-strength pressure; the upper and lower electrodes are wrapped up in the silica gel that is half arc, and narrow and small space when upper and lower electrode arc extinguishing, the area is little, produces the pressure dispersion phenomenon, wraps up the electrode with the silica gel of half arc and can focus the pressure wave, and the pressure of arc extinguishing passageway improves several times, effectively blocks the electric arc. The screw generates thrust to the stainless steel gasket and the silica gel assembly, so that the stainless steel gasket and the silica gel assembly are tightly matched with the O-shaped ring and the ceramic tube, the purpose of high-pressure sealing is achieved, high-strength pressure is well prevented from leaking, and the generated high-strength pressure can be guaranteed to act on the electric arc to the maximum.
When the device is struck by lightning, a liquid-electricity effect is generated, a strong impact pressure wave is formed, and the strong impact pressure wave acts on a discharge channel in an impulse or impact pressure mode to cut off electric arcs. Meanwhile, a certain pressure is applied to the arc extinguishing liquid in the ceramic tube, and according to the Pascal principle, the pressure change of a certain part of the static fluid in the closed container is transmitted to all directions invariably, so that a larger acting force is generated on the inner wall of the ceramic tube. The action rebounds after acting on the shell to form an action force with the direction pointing to the center of the ceramic tube, so that the purposes of cutting off the electric arc, reducing the amplitude of the current, reducing the gradient of the lightning wave and prolonging the discharge time of the electric arc are achieved, and the arc is effectively extinguished.
In this embodiment, the sealing silica gel 8 is a "T" type structure silica gel, and the bottom of the "T" type structure silica gel is a concave spherical structure. The interior is a paraboloid through which the pressure wave is scattered and focused to a point which is many times higher than the original channel. And a large asymmetry is formed, so that the arc interruption is advanced and interrupted at a smaller current amplitude.
In this embodiment, the conductive electrode 7 is a "T" type structure electrode, the upper end of the "T" type structure electrode is a metal block, the lower end of the "T" type structure electrode is a graphite rod, and the graphite rod is fixedly connected with the metal block.
Set up to graphite electrode at the lightning-receiving part, graphite electrode electric conductivity is good, easily introduces the electric arc in the recoil pipe: graphite is a non-metallic material, and the conductivity of graphite is 100 times higher than that of general non-metallic ore. Graphite is an electrical conductor in that the periphery of each carbon atom in graphite is linked to three other carbon atoms arranged in a honeycomb pattern of many hexagons, and since each carbon atom gives off an electron, those electrons are free to move. Generally, the electrical discharge machining speed of the graphite electrode is 1.5 to 2 times faster than that of the copper electrode as a whole. When the power transmission line is struck by lightning, the graphite electrode can play a role in striking arcs, so that the arcs can smoothly enter the arc extinguishing pipe.
The graphite electrode has extremely high melting point, can bear larger current and is not easy to deform: graphite electrodes have the property of being able to withstand high current conditions. The softening point of copper is about 1000 ℃, and the copper is easy to deform due to heating; and the sublimation temperature of the graphite is about 3650 ℃. Lightning strike currents of between 5000 amperes and 5 kiloamperes, producing lightning strike temperatures of up to 3000 degrees. Therefore, the metal electrode is easy to deform under the action of lightning strike heavy current, generates metal powder, splashes, damages the structure of the arc extinguish chamber and influences the effect of recoil arc extinction, and the graphite electrode can effectively solve the problems.
The loss of the graphite electrode is small: the graphite electrode has the characteristic of bearing a large current condition, a polarity effect is generated under the action of lightning arcs, partial corrosion removal objects and carbon particles can be adhered to the surface of the electrode to form a protective layer, and the graphite electrode is ensured to have extremely low loss or even zero loss in the process of recoil arc extinguishing.
The working process of the arc-extinguishing device is as follows,
step 1: before lightning is formed, because of electrostatic induction, charges with polarity opposite to that of thundercloud are induced in the insulating tube and accumulated in the sealed insulating tube, and because liquid is incompressible fluid, the charges cannot move freely, and finally an arc chain is formed in the insulating tube; mutually repulsive coulomb force is generated among the charges with the same polarity, and the coulomb force acts on the pipe wall to form reaction force due to the sealing of the insulating pipe, so that the induced charge chain is cut off;
step 2: when arc discharge is initiated in the sealed tube filled with insulating oil, the electrohydraulic effect generates shock waves which impact to the side edges. Arc discharge is initiated in the ceramic tube filled with insulating oil, part of the insulating oil in the discharge channel is instantly vaporized, decomposed and ionized into high-temperature plasma and suddenly expands to form a mechanical pressure wave which rapidly propagates outwards, but the liquid can be regarded as a shock wave transmission medium which can not be compressed, so that when the discharge channel is subjected to liquid-phase discharge, the mechanical effect of power is shown to the outside, an acting force which impacts the wall of the ceramic tube is formed in the ceramic tube, and the wall of the ceramic tube generates shock waves in the insulating oil medium due to the interaction of the forces.
And step 3: the Pascal effect enhances the liquid-electric effect, when the electric arc acts on the arc extinguishing insulating liquid 6, and when a certain part of the static arc extinguishing insulating liquid 6 generates pressure intensity change, the electric arc is constantly transmitted to all directions of the inner side of the sealed tube. When an impact electric arc acts on the metal electrode to apply pressure to the insulating oil in the ceramic tube, according to the Pascal principle, a certain part of static fluid in the closed container generates pressure change, the pressure is constantly transmitted to all directions, and then the insulating oil medium around is impacted by a larger acting force from a discharge channel in the ceramic tube, and the acting force rebounds after contacting the wall of the ceramic tube.
And 4, step 4: impact waves of the liquid-electricity effect and the Pascal effect return to impact after impacting the side edges, the two ends are arranged to be spherical concave surfaces, pressure waves are focused at the focus, the pressure of the impact waves is increased, the impact arc extinguishing is carried out on the arc channel in a centralized mode, and overvoltage protection is carried out.
The hydro-electric effect and the Pascal effect enable the pressure in the ceramic tube to be increased, the temperature to be increased, acting force pointing to the center from the ceramic tube wall is generated, under the acting force, the electric arc moves towards the tip of the arc-extinguishing grid, the tip lengthens the length of the electric arc, under the condition that insulating oil blows the electric arc, the temperature of the electric arc is reduced, the electric arc is extinguished more quickly, the longer the electric arc formed in the ceramic tube is, the larger the acting force on the ceramic tube wall is, the larger the impact force for cutting the electric arc in reverse is, the action force rebounds after acting on the shell, the acting force pointing to the center of the insulating tube is formed, the electric arc is cut, the amplitude and the gradient of current are reduced, counterattack voltage is avoided, and induced lightning overvoltage is reduced.
The specific process of the pressure wave focusing on the focus is that the pressure wave is reflected by the ceramic tube wall and focused on the focus through the paraboloid, and larger pressure is generated at the focus, so that the electric arc is cut off when the amplitude of the lightning current is very small, and the electric field is reduced due to the existence of a breakpoint, and the arc establishment rate is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. The utility model provides a bear sealed arc control device of high strength pressure which characterized in that: including plastic cover (1), steel bushing (4), ceramic tube (5), arc extinguishing insulating liquid (6), conducting electrode (7), sealing silica gel (8), conducting electrode (7) nestification is in sealing silica gel (8), sealing silica gel (8) seal the both ends that set up at ceramic tube (5), steel bushing (4) fastening is in the outside of the junction of sealing silica gel (8) and ceramic tube (5), arc extinguishing insulating liquid (6) set up in ceramic tube (5), plastic cover (1) cover is established in the outside of steel bushing (4) and ceramic tube (5).
2. An arc extinguishing device bearing a high-strength pressure seal according to claim 1, wherein: still include stainless steel packing ring (2) and O type ring (3), stainless steel packing ring (2) pad is established at the front end of leading electrical pole (7), and O type ring (3) set up between sealed silica gel (8) and ceramic pipe (5) contact department.
3. An arc extinguishing device bearing a high-strength pressure seal according to claim 1, wherein: the sealing device is characterized by further comprising an extrusion fixing block (9), wherein the extrusion fixing block (9) is arranged on the outer side of the sealing silica gel (8), a bolt hole (10) is formed in the extrusion fixing block (9), and the bolt hole (10) is in contact with the stainless steel gasket (2).
4. An arc extinguishing device bearing a high-strength pressure seal according to claim 3, wherein: the sealing silica gel (8) is arranged into T-shaped structure silica gel, and the bottom of the T-shaped structure silica gel is arranged into a spherical concave structure.
5. An arc extinguishing device bearing a high-strength pressure seal according to claim 4, wherein: the conductive electrode (7) is arranged to be a T-shaped structure electrode, the upper end of the T-shaped structure electrode is arranged to be a metal block, the lower end of the T-shaped structure electrode is arranged to be a graphite rod, and the graphite rod is fixedly connected with the metal block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121850963.2U CN216355294U (en) | 2021-08-09 | 2021-08-09 | Arc extinguishing device bearing high-strength pressure seal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121850963.2U CN216355294U (en) | 2021-08-09 | 2021-08-09 | Arc extinguishing device bearing high-strength pressure seal |
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| Publication Number | Publication Date |
|---|---|
| CN216355294U true CN216355294U (en) | 2022-04-19 |
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| CN202121850963.2U Active CN216355294U (en) | 2021-08-09 | 2021-08-09 | Arc extinguishing device bearing high-strength pressure seal |
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- 2021-08-09 CN CN202121850963.2U patent/CN216355294U/en active Active
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