WO2016058548A1

WO2016058548A1 - Repulsion operation mechanism

Info

Publication number: WO2016058548A1
Application number: PCT/CN2015/092026
Authority: WO
Inventors: 程铁汉; 马志华; 孙珂珂; 刘畅; 张豪; 赵晓民; 胡延涛; 门博
Original assignee: 国家电网公司; 平高集团有限公司; 华北电网有限公司
Priority date: 2014-10-16
Filing date: 2015-10-15
Publication date: 2016-04-21
Also published as: CN104362050B; CN104362050A

Abstract

A repulsion operation mechanism comprises a movable iron core (90) in transmission connection with a switch pull rod (19), and a sealing cavity (7) through which the movable iron core (90) moves in a reciprocating manner for opening and closing purposes. When moving to two ends of the sealing cavity (7), the movable iron core (90) is respectively at a closing position and an opening position. The movable iron core (90) is a moving plate that divides the sealing cavity (7) into two portions. Through holes (610) that connect the inside and the outside of the sealing cavity (7) and are used for feeding or discharging buffering media are formed at an opening position and a closing position or at positions close to the opening position and the closing position on a circumferential wall of the sealing cavity (7). By means of the repulsion operation mechanism, quick buffering on the opening and closing movement of the switch pull rod can be effectively realized, and the buffering effect is good.

Description

Repulsive operating mechanism

Technical field

The invention relates to an ultra-high speed operating mechanism for a DC circuit breaker, in particular to a repulsion operating mechanism.

Background technique

Multi-terminal direct current transmission based on flexible direct current transmission technology has been used more and more in Europe, North America, China and other countries and regions. Although there are several multi-terminal DC transmission systems in operation in the world, due to the lack of DC circuit breakers, The reliability, flexibility and continuity of multi-terminal HVDC transmission are greatly limited, which causes serious obstacles to its popularization and application, and also has a great impact on the construction of DC grid in the future. The lack of high-voltage DC circuit breakers has become a bottleneck affecting the world's construction of the future DC grid, and its development work is imminent.

When a flexible DC and multi-terminal DC transmission system fails, a large short-circuit current is generated, and the fault current rises very quickly, requiring the DC breaker to be turned off in a very short period of time. For example, in a 220kV DC grid (where the maximum overvoltage allowed is 10%), the DC side will produce an equivalent inductance of 100mH, and the DC side current will rise at a rate of 3.5kA/ms when a short circuit occurs, assuming normal The current value on the line during operation is 2kA. After 2ms, the short-circuit current on the line can reach 9kA. That is, a high-voltage DC circuit breaker capable of breaking 9kA current must operate quickly within 2ms to cut off the current. However, the existing spring operating mechanism and the hydraulic operating mechanism have a closing time of several tens of milliseconds, and the breaking time is long, and the breaking time of several milliseconds cannot be satisfied.

The Chinese invention patent application with the publication number CN102214522A discloses a permanent magnet operating mechanism for high and low voltage switches with an air opening buffer device, and the moving iron core and the air chamber of the permanent magnet operating mechanism constitute an air opening buffer device The movable iron core compresses the air in the air cavity when moving at a high speed along the axis thereof in the air cavity, and the compressed air has a reaction force against the moving iron core to form a buffer, wherein the moving iron core and the air cavity of the permanent magnet operating mechanism There is a gap between the inner hole walls, and the compressed air can overflow from the gap. In the same mechanism, the lower end of the movable iron core is fixed with a piston panel, and the piston panel is provided with a vent hole, and the movable iron core When the air is compressed, the gas can be discharged from the vent hole. The permanent magnet operating mechanism has a gap between the movable iron core and the inner wall of the gas chamber when the moving iron core is opened, and a vent hole is arranged on the piston panel at the lower end of the moving iron core, so that the air hole is opposite to the moving iron The core has a limited buffer and cannot meet the buffering requirements of the ultra-high-speed mechanical switch. It is easy to damage the operating mechanism due to mechanical shock caused by the buffer failure.

Summary of the invention

It is an object of the present invention to provide a repulsive operating mechanism suitable for an ultra-high speed mechanical switch for solving the problem that the existing operating mechanism cannot be effectively buffered.

The repulsive operating mechanism of the present invention adopts the following technical solutions:

A repulsive operating mechanism includes a movable iron core connected to a switch rod drive and a sealed cavity for reciprocating movement of the movable iron core, and the movable iron core is respectively in a joint when moving to both ends of the sealed cavity a brake position and a trip position, wherein the movable iron core is a moving disc that isolates the sealed cavity into two parts, and the circumferential cavity wall of the sealed cavity is provided at a position close to or close to a closing position A through hole for connecting the buffer medium to the inside and outside of the sealed cavity.

The sealing cavity is composed of two insulating blocks which are respectively butted together on the butt end faces, and the moving disk is sealed and slidingly matched with the groove groove wall of the insulating block, and the repulsion operating mechanism is used for driving the moving disk. The two coils are respectively fixed to the bottoms of the grooves of the two insulating blocks, and the through holes are arranged next to the two end faces of the coils close to each other.

The two insulating blocks are fixedly butted by a fixing sleeve sleeved on the outer circumference of the insulating block, and the two opposite ends of the insulating block are provided with an outer flange which is matched with the inner hole of the fixing sleeve, and both ends of the fixing sleeve Stop faces for blocking the clamping of the two insulating blocks are respectively provided.

The wall of the fixing sleeve is provided with a hole penetrating the wall of the cylinder.

One end of the fixing sleeve is provided with a spring retaining mechanism, and the spring retaining mechanism includes two limit springs symmetrically disposed on two sides of the fixed sleeve axis. When the opening and closing position is performed, the ends of the switch pull rod are respectively limited. On both sides of the axis of the spring, the end of the switch rod is respectively hinged with a connecting block pressed against one end of the limit spring near the axis of the fixed sleeve, and the other end of the limit spring is provided for adjusting the limit spring pre-compression The amount of adjustment device.

Two limiting springs are respectively disposed in the two limiting sleeves, the connecting block is slidably assembled in the limiting sleeve, and the adjusting device comprises an adjusting bolt screwed on the bottom of the limiting sleeve, the adjusting One end of the bolt extending into the bottom of the limit sleeve is connected to the adjusting pressure plate which is pressed against the end of the limit spring, and the adjusting bolt can be screwed to adjust the pre-compression of the limit spring.

The two sides of the spring holding mechanism are respectively provided with blocking blocks for blocking the movement stroke of the limit switch lever.

The repulsive operating mechanism of the present invention comprises a movable iron core connected to the switch pull rod and a sealed cavity for reciprocating movement of the movable iron core, and the movable iron core is respectively in the closing position when moving to both ends of the sealed cavity And the opening position, the moving iron core is a moving disc for isolating the sealing cavity into two parts, and the circumferential cavity wall of the sealing cavity is provided at the opening and closing position or close to the opening and closing position to be connected with the inside and outside of the sealing cavity. A through hole for accessing the buffer medium. When the moving iron core is initially moved at one end of the sealing cavity, when the moving iron core squeezes the buffering medium in the sealing cavity on the moving direction side, the buffering medium is discharged through the through hole, thereby reducing the buffer medium to the moving iron. The reaction force of the core enables the moving iron core to maintain a high moving speed. When the moving iron core moves to the through hole, the discharge portion of the through hole for the buffer medium gradually decreases with the movement of the moving iron core, and the buffer medium The discharge amount is reduced, the reaction force of the buffer medium on the moving iron core is getting larger and larger, and the buffering braking of the moving iron core is realized. Since the through hole is disposed at the opening and closing position or close to the opening and closing position, the sealing cavity can be Quick braking is achieved when the moving iron core moves to the closing position, so that the switch lever connected to the driving rod can be moved away from the closing position at high speed by the moving iron core, and When moving to the opening position, the speed is reduced to the minimum, the buffering effect is better, the collision of the moving iron core is effectively avoided, the number of through holes is adjusted by data calculation, and even the movable iron core drives the switch lever to move to the opening. The speed at the position is almost zero. At this time, the breaking distance of the switch lever is the axial length of the sealing cavity. The method of buffering the movable iron core by filling the buffer medium in the sealed cavity body can realize effective buffering and braking of the switch rod in a very short opening and short distance.

Further, the sealed cavity is formed by relatively combining two insulating block notches, and the coils are respectively disposed at the bottom of the insulating block groove, thereby effectively preventing the current in the coil from electromagnetically affecting the external metal parts, and improving the electric energy and the kinetic energy. Conversion efficiency.

Further, one end of the fixing sleeve is connected with a spring retaining mechanism, which effectively maintains the switch pull rod stably in the opening and closing position after the completion of the opening and closing movement, and the spring retaining mechanism has a simple structure, instead of the design of the conventional magnetic holding mechanism. To make the structure simpler and more reliable. At the same time, the bottom of the limit sleeve of the opening and closing holding mechanism is provided with an adjusting bolt, and the pre-compression amount of the limit spring can be adjusted by screwing the adjusting bolt, thereby adjusting the retaining size of the limit spring to the switch rod.

DRAWINGS

1 is a schematic structural view of an embodiment of a repulsive operating mechanism of the present invention.

detailed description

An embodiment of the repulsion operating mechanism of the present invention is as shown in FIG. 1 , which includes a transmission pull rod 19 extending left and right. The right end of the transmission rod 19 is connected with a switch pull rod, and the movable iron rod 90 is fixed on the transmission pull rod 19, and the moving iron core is fixed. The plane of the 90 is perpendicular to the transmission rod 19, and the left and right sides of the movable iron core 90 are respectively provided with two

insulating blocks

61 and 62. The

insulating blocks

61 and 62 have the same structure, and the

insulating blocks

61 and 62 are respectively provided with openings and openings. The grooves of the insulating cores 90 are aligned with the outer circumferences of the movable iron cores 90, and the groove bottoms of the grooves are respectively fixed with the first coil 91 and the second coil 92. The outer diameters of the

second coils

91 and 92 are the same as the outer diameter of the movable iron core 90 and coincide with the groove diameter of the groove. The first and

second coils

91 and 92 are both parallel to the movable iron core 90 and located at the movable iron core 90. On both sides, the groove wall of the groove of the

insulating block

61, 62 near the groove bottom is uniformly distributed with a radially extending through hole 610 in the circumferential direction, and all the through holes are located in the same circumferential plane perpendicular to the axis, wherein the number of the through holes Can be arranged according to actual needs. The left and right ends of the transmission rod 19 pass through the first and

second coils

91 and 92 and the

insulating blocks

61 and 62, respectively, and the transmission rod 19 is slidably engaged with the first and

second coils

91 and 92 and the

insulating blocks

61 and 62. A sealing ring 600 for sealing is provided in the hole of the 61, 62 sliding engagement with the driving rod 19, and the

insulating blocks

61, 62 are open and fixedly mounted in the metal fixing sleeve 21, and the two opposite

insulating blocks

61, 62 are relatively far apart. The outer peripheral faces of the ends are respectively provided with outer convex edges which are equal in diameter and equal to the inner diameter of the fixing sleeve 21, between the two outer convex edges of the

insulating blocks

61, 62, the

insulating blocks

61, 62 There is a certain flow passage for the buffer medium to flow between the outer peripheral surface and the inner wall surface of the fixed sleeve 21. The grooves of the two insulating blocks constitute an insulating cavity, and the fixing sleeve 21 is right. The end has a cylinder bottom for blocking the insulating block 61, and the left side opening has an outer flange for connection, and the left open end of the fixing sleeve 21 is connected with a metal fixing seat 4, and the fixing base 4 is a tubular shape extending left and right. The two ends are respectively provided with connecting flanges 41 and 42. The connecting flange 41 is connected to the outer flange of the fixing sleeve 21 by screws, and the flange surface of the connecting flange 41 is pressed against the left end surface of the insulating block 62, and is connected. The flange 41 and the right side of the fixed sleeve 21 cooperate to press and fix the

insulating blocks

61, 62 together, and the first and

second coils

91, 92 and the side walls of the

insulating blocks

61, 62 are enclosed to form a seal. The cavity 7 and the left and right ends of the transmission rod 19 respectively protrude from the flange surface of the fixing base 4 and the bottom of the fixing sleeve 21 and are in sliding sliding fit with the center hole of the flange surface and the bottom of the cylinder, and the transmission rod 19 is fixed. The moving iron core 90 can be reciprocally slid in the left and right of the insulating sealing block 7 and the insulating sealing block 7 to realize the opening and closing. The circumferential wall of the fixing sleeve 21 is uniformly provided with the long hole 211 and is in the shape of a grid. It is stated that the fixing sleeve 21 is disposed in a sealed high-pressure gas-filled space during use, and the high voltage The body can fill the sealed cavity body through the elongated hole 211, that is, the buffer medium is a high-pressure gas, and the elongated hole 211 can also enable the gas in the sealed cavity 7 to be discharged after being discharged from the through hole when the moving iron core moves. In the outer sealing space of the sleeve, of course, in other embodiments, holes of other shapes or other arrangements may be formed on the wall of the fixing sleeve, or the wall of the fixing sleeve is not opened. The gas discharged from the through hole on one side of the core moving direction can enter the sealing cavity through the flow passage from the through hole on the side opposite to the moving direction of the moving iron core. In other embodiments, the buffer medium may also be other media, such as hydraulic oil, etc., in which case the through hole needs to communicate with the hydraulic oil tank. The right side of the fixed sleeve 21 is uniformly provided with a long hole 212 around the transmission rod 19, and the bottom of the tube is further provided with an outlet hole for the wire 101 connected to the first and

second coils

91, 92. Hole 212 reduces the weight of the entire device.

The end portion of the connecting rod 41 extending from the connecting flange 41 of the fixing base 4 is provided with a top block 18 which is perpendicular to the transmission rod 19 and symmetrically extends up and down with the transmission rod 19, and the side wall of the fixing seat 4 is provided with a closing and closing The holding structure 5 directly fixes the opening and closing holding mechanism on the fixing seat to make the structure simpler. The opening and closing holding mechanism 5 includes two limiting sleeves 50 which are vertically symmetrically disposed on the side wall of the fixing base 4, two The core of the limiting sleeve 50 is in the same plane as the top block 18. The open ends of the two limiting sleeves 50 are flush with the inner wall surface of the cylindrical fixing seat 4, and the two limiting sleeves 50 are respectively limited. The outer circumference of the limiting spring 51 is matched with the inner hole of the limiting sleeve 50 to avoid the radial displacement of the limiting spring in the sleeve. The limiting sleeve 50 is also slidably fitted with the slider 52, and the limit is fixed. The spring is located between the slider 52 and the bottom of the limiting sleeve 50. One end of the two sliders 52 is pressed against one end of the limiting spring 51, and the other end passes through the connecting block 17 and the upper and lower ends of the top block 18, respectively. Hinged, when the drive rod 19 moves horizontally left and right, the upper and lower sliders 52 slide up and down, respectively, and squeeze and relax The limiting spring 51 of the limiting sleeve 50 is further provided with an adjusting bolt 53 at the bottom of the limiting sleeve 50. The adjusting bolt 53 is screwed with the threaded hole of the bottom of the adjusting sleeve 50, and the adjusting bolt 53 is inserted into the cylinder. An adjusting platen 54 is connected to one end of the bottom. The adjusting platen 54 is pressed against the end of the limiting spring 51, and the length of the adjusting bolt 53 extending into the bottom of the cylinder can be adjusted to adjust the length of the limiting spring 51.

A first blocking block 122 is disposed on a flange surface of the connecting flange 41 of the fixing base 4 on the side of the connecting rod 19, and the first blocking block 122 has two symmetrical positioning on the upper and lower sides of the transmission rod 19 The side is located on the right side of the top block 18, and the upper and lower first stop blocks 122 respectively correspond to the upper and lower ends of the top block 18. When the transmission rod 19 moves to the right, the first stop block 122 is used to limit the stop top. The farthest position of the block 18 moving to the right, that is, the closing stroke; the second blocking block 121 is further disposed at the center of the inner hole of the fixing base 4, and the second stopping block 121 is located at the left side of the top block 18 at the driving rod When the 19 moves to the left, the second stop block 121 is used to block the farthest distance from the limit top block 18 to the left, that is, the trip stroke. The connecting flange 42 of the fixing base 4 is connected with a metal cover plate 3, and the connecting plate 110 is connected with a connecting terminal 110 by screws. The connecting terminal 110 is injection-molded with a wire 100 connected to the pulse power source 10, and the pulse power source 10 is fixedly arranged at the wiring. The left side of the terminal 110, the pulse power supply 10 is disposed at one end of the metal fixing base 4 to reduce the line inductance, improve the power conversion efficiency, and at the same time make the whole mechanism structure more compact, the wire 100 directly with the two first and second The

coils

91, 92 are connected so that the energization line is minimized, and the resistance and inductance generated by the excessive length of the wires are prevented from affecting the pulse current.

The embodiment of the repulsive operating mechanism of the present invention is as follows: when the brake is opened, the transmission rod 19 is in the closing position, that is, the top block 18 on the transmission rod is located at the rightmost end of the movement stroke, and the moving iron core is located at the most closed insulating chamber. At the right end, the pulse power source 10 energizes the first coil 91, and the movable iron core 90 generates an induced eddy current. The induced eddy current is opposite to the current direction of the first coil 91, and a repulsive force is generated between the movable iron core 90 and the first coil 91, thereby moving the iron core. 90 drives the transmission rod 19 to move to the left, wherein the movement process of the transmission rod is divided into two stages: in the first stage, due to the existence of the through hole 610, in the initial stage of the movement of the movable iron core 90, the moving iron core 90 moves in the moving direction side. The high-pressure gas can be discharged from the through-hole, and the force of the high-pressure gas on the moving iron core is not large and constant, and the high-speed opening and closing movement of the transmission rod is ensured, and the switching time of the switch is not affected during use; In the second stage, the moving iron core 90 moves to the left to the through hole. As the moving iron core continues to move, the outer circumference of the moving iron core gradually blocks the through hole until the through hole is completely blocked. High pressure gas supply for the hole The aperture is getting smaller and smaller, the discharge of the high-pressure buffer gas is less and less, the reaction force of the gas on the moving iron core 90 is getting larger and larger, and the damping force of the moving iron core is getting larger and larger, so that the moving iron core is The speed gradually decreases until the top block 18 of the drive rod contacts the second stop block 121 to stop moving, that is, the opening process is completed, and the repulsion operating mechanism can be realized by being applied to the fast switch by such gas buffering. Quickly open the brakes and achieve braking within a very short distance and time after the completion of the opening, to avoid collision of the moving iron core with the first and second coils. During the entire opening process, the limit spring in the opening and closing holding mechanism is in the early stage of the movement of the moving iron core, the top block 18 is close to the limit sleeve, the limit spring is compressed, and the top block moves to the left in the switch rod When the limit sleeve is over, the limit spring is extended. When the switch lever moves to the top block and contacts the limit stop 121, the limit spring applies a retaining force to the top block to keep the switch lever in the open position; At the time of the gate, the pulse power source 10 energizes the second coil 92, and a repulsive force is generated between the second coil 92 and the movable iron core 90, and the movement of the switch rod is reversed.

In the above embodiment, the repulsive operating mechanism includes two coils for respectively driving the driving disc to open and close, in In other embodiments, the repulsive operating mechanism may employ a permanent magnet mechanism in which a coil and a permanent magnet are used in combination.

In the above embodiment, the sealing cavity is composed of two insulating blocks which are butted together and provided with grooves on the abutting end faces. In other embodiments, the sealing cavity can pass through the barrel insulating block and block the barrel insulation. The blocking sealing plate is formed at the opening of the block. At this time, the first and second coils are respectively disposed on the bottom of the insulating block and the stopper sealing plate.

In the above embodiment, the two insulating blocks are fixedly coupled by the fixing sleeve and enclosed by the first and second coils to form a sealed cavity for the left and right reciprocating movement of the driving iron core. In other embodiments, two The insulating block can also be clamped and fixed by clamping plates provided on the left and right sides of the two insulating blocks.

In the above embodiment, the inner hole of the fixing sleeve is prevented from contacting the outer flange of the two ends of the insulating block. In other embodiments, the outer ends of the insulating block may not have an outer flange, and the outer circumference of the insulating block may be fixed with the fixing sleeve. The inner hole is matched and matched. At this time, the hole in the wall of the fixing sleeve needs to communicate with the through hole in the insulating block, so that the gas in the sealed cavity formed by the insulating block can be discharged through the through hole and the hole in the fixing sleeve. And enter.

In the above embodiment, the limit spring is mounted in the limit sleeve, and the bottom of the limit sleeve is screwed with the adjusting bolt. In other embodiments, the limit spring can be sleeved on the outer circumference of the hollow cylinder, and the end of the drive rod A circular tube having a blocking edge on the outer circumference is hinged, and the round tube is sleeved on the hollow cylinder, and the stopping edge is stopped at the end of the limiting spring. The movement of the driving rod drives the circular tube to slide on the hollow cylinder, thereby compressing or relaxing the limit. The spring, the other end of the hollow cylinder can be threaded, and a screw is screwed. The outer circumference of the screw is provided with a baffle for stopping the end of the limit spring, and the screw can adjust the pre-compression of the limit spring.

In the above embodiment, the fixed seat is provided with a opening and closing holding mechanism, and the opening and closing holding mechanism is held by a spring. In other embodiments, the opening and closing holding mechanism may not be provided, and only the opening and closing coil is continuously required. It can be energized, and other types of opening and closing holding mechanisms, such as an electromagnetic holding mechanism, can also be provided.

In the above embodiment, the first seat and the second block for stopping the movement of the limit switch lever opening and closing are provided on the fixing seat. In other embodiments, the blocking block may not be provided, and in order to avoid the moving iron The high-speed movement of the core smashes the first and second coils, and the reinforcing members may be disposed on the first and second coils, or the first and second blocking blocks may be disposed on other fixed structures fixed to the fixed sleeve.

Claims

A repulsive operating mechanism includes a movable iron core connected to a switch rod drive and a sealed cavity for reciprocating movement of the movable iron core, and the movable iron core is respectively in a joint when moving to both ends of the sealed cavity The brake position and the opening position are characterized in that the moving iron core is a moving disc that isolates the sealed cavity into two parts, and the circumferential cavity wall of the sealed cavity is on the opening and closing position or close to the opening and closing A through hole for connecting the buffer medium to the inside and outside of the sealed cavity is provided at the position.
The repulsive operating mechanism according to claim 1, wherein the sealing cavity is composed of two insulating blocks which are butted together and have grooves respectively on the abutting end faces, and the grooves of the moving plate and the insulating block The slot wall seals the sliding fit, and the two coils for driving the motion disk of the repulsive operating mechanism are respectively fixed to the bottoms of the grooves of the two insulating blocks, and the through holes are disposed next to the two end faces of the coils close to each other.
The repulsion operating mechanism according to claim 2, wherein the two insulating blocks are fixedly butted by a fixing sleeve sleeved on the outer circumference of the insulating block, and the two opposite ends of the insulating block are provided with the inner side of the fixing sleeve. The outer flange of the hole is fitted, and the two ends of the fixing sleeve are respectively provided with stopping surfaces for blocking the clamping of the two insulating blocks.
The repulsive operating mechanism according to claim 3, wherein the cylinder wall of the fixing sleeve is provided with a hole penetrating the wall of the cylinder.
The repulsion operating mechanism according to claim 3, wherein one end of the fixing sleeve is provided with a spring retaining mechanism, and the spring retaining mechanism comprises two limit springs symmetrically disposed on two sides of the fixed sleeve axis. In the closing position, the ends of the switch rods are respectively located on two sides of the axis of the limit spring, and the end portions of the switch rods are respectively hinged with a connecting block pressing the end of the limit spring close to the axis of the fixed sleeve, The other end of the limit spring is provided with an adjusting device for adjusting the amount of pre-compression of the limit spring.
The repulsion operating mechanism according to claim 5, wherein the two limiting springs are respectively disposed in the two limiting sleeves, the connecting block is slidably assembled in the limiting sleeve, and the adjusting device comprises An adjusting bolt screwed on the bottom of the limiting sleeve, the adjusting bolt extending into the bottom of the limiting sleeve is connected with the adjusting pressure plate which is pressed against the end of the limiting spring, and the adjusting bolt can adjust the limit spring Pre-compressed.
The repulsion operating mechanism according to claim 5 or 6, wherein the two sides of the spring holding mechanism are respectively provided with blocking blocks for blocking the movement stroke of the limit switch lever.