A self-supplementing liquid recoil arc extinguishing device

Abstract

The invention discloses a self-supplementing liquid recoil arc extinguishing device, which belongs to the field of lightning protection arc extinguishing technology, including a recoil pipe, an automatic liquid replenishing tank and a liquid storage box, the recoil pipe is vertically inverted and downwardly arranged, the bottom of the automatic liquid replenishing tank is sealed with the recoil pipe, the liquid storage box is arranged at the upper end of the automatic liquid replenishing tank and is sealed, a plastic ball and a liquid are placed in the liquid storage box, the plastic ball sinks to the bottom of the liquid, a plastic ball is arranged at the bottom of the recoil pipe to block the nozzle, and liquid is stored in the recoil pipe. The arc extinguishing pressure of the present invention that cuts off the arc reaches 100 atmospheres, which helps the recoil pressure to act on the impact arc and cut it off, cuts off the arc building channel, and the impact arc reignition is delayed, and the persistent and huge recoil pressure destroys the continuous discharge condition and the reignition condition.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection and arc extinguishing, and in particular to a self-supplementing liquid recoil arc extinguishing device. Background Art

[0002] Lightning strikes can cause various forms of damage and destruction to power facilities. Thundercloud discharges can cause lightning overvoltage in power systems. Lightning overvoltage can damage insulators and transmission lines. When lightning strikes a transmission line, the impulse flashover causes line insulator flashover, which in turn generates a large power frequency follow-current, damaging insulator strings and hardware, leading to line accidents. When lightning strikes a transmission line or lightning arrester, it may cause strand breakage or even fracture, making it impossible to carry out power transmission work.

[0003] The single recoil arc extinguishing device can effectively reduce the lightning current and make the volt-second characteristic of the active arc extinguishing parallel gap flatter. However, the existing single recoil arc extinguishing device can only reduce the steepness of the lightning current wave front and cannot further attenuate the lightning current amplitude, so its ability to attenuate lightning current is limited. Summary of the invention

[0004] The purpose of the present invention is to provide a self-replenishing liquid recoil arc extinguishing device to solve the technical problem that the existing recoil arc extinguishing device has limited ability to reduce the amplitude of lightning current. The purpose is to enhance the arc extinguishing pressure of the single recoil arc extinguishing device during the recoil arc extinguishing process, which can not only attenuate the amplitude of lightning current, but also prolong the discharge time of the arc, and avoid the instantaneous lightning current amplitude being too large to cause damage to the transmission line.

[0005] A self-replenishing liquid recoil arc extinguishing device comprises a recoil pipe, an automatic liquid replenishing tank and a liquid storage box. The recoil pipe is vertically inverted and downwardly arranged. The bottom of the automatic liquid replenishing tank is sealed with the recoil pipe. The liquid storage box is arranged at the upper end of the automatic liquid replenishing tank and is sealed. Plastic balls and liquid are placed in the liquid storage box. The plastic balls sink to the bottom of the liquid. A plastic ball is arranged at the bottom of the recoil pipe to block the nozzle. Liquid is stored in the recoil pipe.

[0006] Furthermore, the bottom of the liquid storage box is set as a funnel structure, the inner diameter of the bottom of the liquid storage box is the same as the outer diameter of the plastic ball, the liquid is an insulating liquid, and a feeding port is set on the top of the liquid storage box.

[0007] Furthermore, an elastic card plate and a rotating wheel are arranged in the automatic liquid filling tank. The elastic card plate is arranged inside the automatic liquid filling tank, the rotating wheel is arranged horizontally, and the rotating blades of the rotating wheel rotate and hit the elastic card plate. A plastic ball groove is arranged between the two impellers of the rotating wheel.

[0008] Furthermore, the insulating liquid is insulating oil, crushed stones are arranged in the plastic balls, and the plastic balls sink to the bottom of the insulating oil.

[0009] Furthermore, the recoil tube includes a ceramic tube body, a top sleeve cover plate, a fixing device, a bottom sleeve cover plate, an insulating covering layer and a skirt. The top sleeve cover plate is arranged on the top of the ceramic tube body, and the bottom sleeve cover plate is arranged on the bottom of the ceramic tube body. The fixing device passes through the top sleeve cover plate and the bottom sleeve cover plate and is fixedly arranged. The insulating covering layer is arranged on the outside of the ceramic tube body, the skirt is arranged on the outside of the insulating covering layer, the top sleeve cover plate is arranged with a recoil nozzle, and the bottom sleeve cover plate is connected to the external hardware.

[0010] Furthermore, the interior of the ceramic tube body is arranged as a hollow cylindrical structure, and the internal hollow hole of the ceramic tube body and the recoil spray hole are arranged on the same straight line.

[0011] Furthermore, the top cover plate includes a top cover plate cover and a top cover plate edge, the top cover plate cover is arranged as an upwardly concave structure, and the top cover plate edge is arranged on the bottom side of the top cover plate cover.

[0012] Furthermore, the fixing device is configured as an insulating screw, and screw holes of the same number and size are provided on the edge of the top cover plate and the bottom cover plate, and the insulating screw passes through the screw holes and is tightened with a nut.

[0013] Furthermore, the insulating covering layer is configured as an epoxy resin layer, which covers the insulating screw, the nut, the edge of the top cover plate and the bottom cover plate, and encloses the ceramic tube body.

[0014] The present invention adopts the above technical solution, and the present invention has the following technical effects:

[0015] The arc extinguishing pressure of the present invention for cutting off the arc reaches 100 atmospheres, which helps the recoil pressure to act on the impact arc and cut it off, cuts off the arc building channel, and delays the reignition of the impact arc. The persistent and huge recoil pressure destroys the continuous discharge conditions and the reignition conditions. After cutting off the impact arc, the reignition breakdown time is greatly delayed by more than ten to tens of microseconds, the steepness of the lightning current is significantly reduced by 90%, and the current amplitude is attenuated by more than 50%. The high-temperature shrinkage characteristics of the PET material balls solve the water storage problem, and the PET device is non-toxic and harmless, will not cause harm to the environment, and realizes automatic liquid replenishment. Yes, the recoil tube can be used multiple times, and there is no need to manually add liquid to the recoil tube directly, which is more convenient. At the same time, after adding liquid once, it can be used for a longer time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the recoil tube structure of the present invention.

[0018] Figure 3 A top view of the recoil tube structure of the present invention without the skirt and epoxy installed.

[0019] Figure 4 It is a schematic diagram of the top cover plate structure of the recoil pipe structure of the present invention.

[0020] Numbers in the figure: 1-ceramic tube body; 2-top cover plate; 2.1-top cover plate cover; 2.2-top cover plate edge; 2.3-top cover plate edge fixing hole; 3-nut; 4-fixing device; 5-bottom cover plate; 6-insulating covering layer; 7-skirt; 8-recoil nozzle; 9-recoil pipe; 10-automatic liquid replenishing tank; 11-elastic card plate; 12-rotating wheel; 13-plastic ball; 14-liquid storage box; 15-feeding port; 16-crushed stone. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, preferred embodiments are given to further describe the present invention in detail. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0022] A self-replenishing liquid recoil arc extinguishing device, such as Figure 1 As shown, it includes a recoil pipe 9, an automatic liquid replenishing tank 10 and a liquid storage box 14. The recoil pipe 9 is vertically inverted and downwardly arranged. The bottom of the automatic liquid replenishing tank 10 is sealed with the recoil pipe 9. The liquid storage box 14 is arranged at the upper end of the automatic liquid replenishing tank 10 and is sealed. Plastic balls 13 and liquid are placed in the liquid storage box 14. The plastic balls 13 sink to the bottom of the liquid. A plastic ball 13 is arranged at the bottom of the recoil pipe 9 to block the nozzle. Liquid is stored in the recoil pipe 9.

[0023] The device is generally installed at one end of the insulator to form a parallel structure. When flashover occurs, an arc appears inside the recoil tube 9, from the bottom to the top. When the arc appears, the temperature increases instantly and there is a burning situation. The plastic ball 13 shrinks instantly and then falls. The liquid inside will be instantly detonated by the arc, and the liquid-electric effect and the superposition effect of the reflected shock wave will appear. When the shock wave impacts backward, since the shock wave will directly impact between the blades of the runner 12, it will give the runner 12 a power, rotate through the elastic card plate 11, and then the plastic ball 13 will fall into the recoil tube 9 again and fall like liquid. At ordinary times, the bottom of the liquid storage box 14 will be stuck by a plastic ball 13, and the liquid basically cannot stay down, only a slight inflow, thereby realizing automatic liquid replenishment.

[0024] Liquid-electric effect: Liquid is injected into a cavity to induce arc discharge. At this time, the liquid in the entire discharge channel expands instantly. Vaporization, decomposition, and ionization into high-temperature plasma occur in this discharge channel, and a mechanical pressure wave that propagates rapidly outward is formed (the maximum pressure of this directional shock pressure wave can reach about 100Mpa) and propagates rapidly through the liquid phase. However, since the liquid can be regarded as a shock wave transmission medium that will not be compressed itself, when liquid phase discharge occurs in the discharge channel, ultra-high power mechanical energy will act on the external environment. This is the liquid-electric effect.

[0025] When lightning strikes the recoil tube containing liquid, at the moment of high steepness pre-breakdown, the liquid cannot deform and displace instantaneously due to the extremely short impact time of the lightning arc. At this time, the liquid can be regarded as a shock wave transmission medium that will not be compressed itself. Under the "hammering" action of the arc, the liquid will simultaneously generate a pressure of about 100Mpa, and the impact arc in the recoil tube will be released through the recoil pressure and cut off, thus cutting off the arc building channel.

[0026] Reflected shock wave superposition effect: When the arc enters the recoil tube containing liquid, the plasma temperature generated by the liquid phase discharge is as high as 1500-3000K. The high temperature and high pressure generated in the recoil tube cannot leak out in time. The shock wave reflects back and forth on the inner wall of the recoil tube, and the reflected waves of each wall are superimposed on each other to increase the overpressure peak. The various pressures generated in the recoil tube generate reflected shock waves after encountering the sealing obstacle at the bottom of the recoil tube. The positive reflected shock waves are superimposed together, which strengthens the vibration and increases the energy of the vibration. A large amount of energy is obtained in a short time and ejected from the arc entrance. The pressure in the tube during the impact stage and the power frequency arc extinguishing is strengthened, which has a suppressive effect on the power frequency continuous current.

[0027] PET material has high temperature shrinkage and flame retardant properties: PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. It is resistant to deformation, abrasion and dimensional stability, has low wear and high hardness, and has the greatest toughness among thermoplastics: good electrical insulation performance and little influence by temperature. It is non-toxic, weather-resistant and has low water absorption.

[0028] When the arc enters the recoil tube, the pressure and temperature inside the recoil tube increase sharply. The PET balls will shrink when heated and have flame retardant properties, which is helpful in suppressing the reignition of the arc. When the strong airflow is ejected from the recoil tube, the PET balls will be ejected from the recoil tube with the airflow. PET is non-toxic and harmless and will not cause harm to the human body.

[0029] In the embodiment of the present invention, the bottom of the liquid storage box 14 is set to a funnel structure, the inner diameter of the bottom of the liquid storage box 14 is the same as the outer diameter of the plastic ball 13, the liquid is an insulating liquid, and the liquid storage box 14 is provided with a feeding port 15. The plastic ball 13 will directly block the bottom of the liquid storage box 14, so that the amount of liquid flowing down is very small, and only when the plastic ball 13 falls, the liquid between the plastic balls 13 will flow down directly.

[0030] In the embodiment of the present invention, an elastic card plate 11 and a rotating wheel 12 are arranged in the automatic liquid replenishment tank 10. The elastic card plate 11 is arranged inside the automatic liquid replenishment tank 10, and the rotating wheel 12 is arranged horizontally, and the rotating blades of the rotating wheel 12 are rotated to hit the elastic card plate 11, and a small plastic ball groove is arranged between the two impellers of the rotating wheel 12. When there is no external force of the shock wave, the rotating wheel 12 will be directly stuck at the elastic card plate 11 and cannot rotate. Only after the shock wave impacts the rotating wheel 12, will it rotate a fan blade position. The elastic card plate 11 and the rotating wheel 12 are both made of insulating materials.

[0031] In the embodiment of the present invention, the insulating liquid is insulating oil, crushed stone 16 is arranged in the plastic ball 13, and the plastic ball 13 sinks to the bottom of the insulating oil.

[0032] In the embodiment of the present invention, Figure 2-3 As shown, the recoil tube 9 includes a ceramic tube body 1, a top cover plate 2, a fixing device 4, a bottom cover plate 5, an insulating covering layer 6 and a skirt 7. The top cover plate 2 is arranged at the top of the ceramic tube body 1, the bottom cover plate 5 is arranged at the bottom of the ceramic tube body 1, the fixing device 4 passes through the top cover plate 2 and the bottom cover plate 5 and is fixedly arranged, the insulating covering layer 6 is arranged on the outside of the ceramic tube body 1, the skirt 7 is arranged on the outside of the insulating covering layer 6, the top cover plate 2 is provided with a recoil nozzle 8, and the bottom cover plate 5 is connected to the external hardware. The interior of the ceramic tube body 1 is arranged as a hollow cylindrical structure, and the internal hollow hole of the ceramic tube body 1 and the recoil nozzle 8 are arranged on the same straight line. First, a circular steel plate with a groove is tightly bonded to the upper and lower ends of the recoil tube with epoxy resin, wherein the center of the steel plate at the upper end of the recoil tube has an opening, and the size is consistent with the aperture size of the recoil tube. There are also 4 circular holes on the steel plate for installing insulating bolts, which are evenly distributed on the periphery of the steel plate. Eight nuts are used at the upper and lower ends of four insulating screws to fix the position of the recoil tube. In order to avoid lightning strikes due to the close distance between the steel plates, the insulating screws, ceramic tubes and nuts are fully encapsulated with epoxy resin. The umbrella skirt is located at the outermost edge of the epoxy resin tube after encapsulation. The diameter of the recoil nozzle 8 is smaller than that of the plastic ball 13, and the internal structure is set as a leaky tube structure, which makes the plastic ball 13 have a better sealing effect.

[0033] In the embodiment of the present invention, Figure 4As shown, the top cover plate 2 includes a top cover plate cover 2.1 and a top cover plate edge 2.2, the top cover plate cover 2.1 is set as an upward concave structure, and the top cover plate edge 2.2 is set on the bottom side of the top cover plate cover 2.1. The fixing device 4 is set as an insulating screw, and the top cover plate edge 2.2 and the bottom cover plate 5 are both provided with screw holes of the same number and size, and the insulating screw passes through the screw hole and is provided with a nut 3 to tighten the setting. The insulating covering layer 6 is set as an epoxy resin layer, covering the insulating screw, the nut 3, the top cover plate edge 2.2 and the bottom cover plate 5, and enclosing the ceramic tube body 1. The top cover plate 2 is mainly used to fix the upper end of the ceramic tube body 1, and then when the top of the top cover plate cover 2.1 is exposed, it can be directly used as an arc-starting electrode to achieve the functions of fixing and arc-starting electrode, and realize dual action. At the same time, the practical life of this arc-starting electrode will be very good, with fixity, thick enough thickness, and it can work normally after multiple arc burning and wear.

[0034] The recoil tube 9 enhances the stability of the recoil arc extinguishing structure, increases the air tightness of the device, avoids gas leakage during the recoil process, concentrates all the recoil energy on the arc, and more effectively reduces the lightning current. When the arc approaches the recoil device, many charges of opposite signs will gather on the surface of the steel plate to form a local field area, which plays a role in attracting lightning through the Coulomb force, so that the arc is discharged preferentially through the recoil channel. At the same time, the steel plate at the lower end of the recoil tube acts as a good conductor, which can smoothly guide the attenuated current into the grounding electrode. By setting the front and rear metal plates together, the strength of the recoil tube can be greatly enhanced, avoiding rupture during the recoil process, and providing a practical life.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A self-replenishing liquid recoil arc extinguishing device, characterized in that: The invention comprises a recoil pipe (9), an automatic liquid replenishing tank (10) and a liquid storage box (14), wherein the recoil pipe (9) is vertically inverted and downwardly arranged, the bottom of the automatic liquid replenishing tank (10) is sealed with the recoil pipe (9), the liquid storage box (14) is arranged at the upper end of the automatic liquid replenishing tank (10) and is sealed, a plastic ball (13) and liquid are placed in the liquid storage box (14), the plastic ball (13) sinks to the bottom of the liquid, a plastic ball (13) is arranged at the bottom of the recoil pipe (9) to block the nozzle, and liquid is stored in the recoil pipe (9); The bottom of the liquid storage box (14) is arranged as a funnel structure, the inner diameter of the bottom of the liquid storage box (14) is the same as the outer diameter of the plastic ball (13), the liquid is an insulating liquid, and a feeding port (15) is arranged on the top of the liquid storage box (14); An elastic cardboard (11) and a rotating wheel (12) are arranged in the automatic liquid replenishing tank (10), the elastic cardboard (11) is arranged inside the automatic liquid replenishing tank (10), the rotating wheel (12) is arranged horizontally, and the rotating blades of the rotating wheel (12) are rotated to hit the elastic cardboard (11), and a small plastic ball groove is arranged between two impellers of the rotating wheel (12); The recoil pipe (9) comprises a ceramic tube body (1), a top cover plate (2), a fixing device (4), a bottom cover plate (5), an insulating covering layer (6) and a skirt (7); the top cover plate (2) is arranged on the top of the ceramic tube body (1); the bottom cover plate (5) is arranged on the bottom of the ceramic tube body (1); the fixing device (4) passes through the top cover plate (2) and the bottom cover plate (5) and is fixedly arranged; the insulating covering layer (6) is arranged on the outside of the ceramic tube body (1); the skirt (7) is arranged on the outside of the insulating covering layer (6); a recoil nozzle (8) is arranged on the top cover plate (2); and the bottom cover plate (5) is connected to an external hardware.

2. A self-supplementing liquid recoil arc extinguishing device according to claim 1, characterized in that: The insulating liquid is insulating oil, crushed stone (16) is arranged in the plastic ball (13), and the plastic ball (13) sinks to the bottom of the insulating oil.

3. A self-supplementing liquid recoil arc extinguishing device according to claim 1, characterized in that: The interior of the ceramic tube body (1) is arranged as a hollow cylindrical structure, and the internal hollow hole of the ceramic tube body (1) and the recoil spray hole (8) are arranged on the same straight line.

4. A self-supplementing liquid recoil arc extinguishing device according to claim 3, characterized in that: The top cover plate (2) comprises a top cover plate cover (2.1) and a top cover plate edge (2.2); the top cover plate cover (2.1) is arranged as an upwardly concave structure, and the top cover plate edge (2.2) is arranged on the bottom side of the top cover plate cover (2.1).

5. A self-supplementing liquid recoil arc extinguishing device according to claim 4, characterized in that: The fixing device (4) is configured as an insulating screw. The top cover plate edge (2.2) and the bottom cover plate (5) are both provided with screw holes of the same number and size. The insulating screw passes through the screw holes and is tightened with a nut (3).

6. A self-supplementing liquid recoil arc extinguishing device according to claim 5, characterized in that: The insulating covering layer (6) is configured as an epoxy resin layer, covering the insulating screw, the nut (3), the edge (2.2) of the top cover plate and the bottom cover plate (5), and encapsulating the ceramic tube body (1).

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