CN108389749B - A three-position isolating grounding switch - Google Patents

Abstract

The invention provides a three-station isolating grounding switch. The three-station isolating and grounding switch includes a switch body with a moving end, and the moving end has an isolating closing position, an opening position and a grounding closing position, and also includes a magnetic operating mechanism. The magnetic operating mechanism includes a mechanism frame and a power output end connected to the moving end transmission that is assembled on the mechanism frame by guide movement. The mechanism frame is equipped with a fixed permanent magnet that forms a magnetic field gap extending along the moving direction of the power output end. In the magnetic field gap There is an electromagnetic coil connected to the power output end that can reciprocate along the extension direction of the magnetic field gap. The electromagnetic coil has a first limit position and a second limit position at both ends on the reciprocating stroke, and a In the intermediate position between the limit position and the second limit position, the magnetic force operating mechanism also includes an elastic member that applies force to the electromagnetic coil and maintains the electromagnetic coil in the intermediate position when stretching to a set length.

Description

A three-position isolating grounding switch

technical field

The invention relates to a three-position isolating grounding switch.

Background technique

The operating mechanisms used in the current three-position isolation and grounding switches are mostly traditional operating mechanisms such as electric mechanisms, electric spring mechanisms, and hydraulic mechanisms. In a specific historical period, limited by the level of technological development, the traditional operating mechanisms have its technological advancement. However, with the advancement of science and technology, the disadvantages of traditional mechanisms are gradually revealed. Traditional mechanisms have defects such as complex structures, many types of parts, difficult installation and maintenance, high operating noise, and oil leakage. The value of intelligent transformation.

An invention patent application with application publication date of July 7, 2017 and application publication number CN106935438A discloses a magnetic operating mechanism, which includes a mechanism frame and a permanent magnet arranged in the mechanism frame. The two permanent magnets form a magnetic field gap, and a coil frame is arranged in the magnetic field gap, and an electromagnetic coil is wound on the coil frame, and the coil frame is driven to move up and down by electrifying the electromagnetic coil, and the switch is opened and closed. Compared with the traditional mechanism such as the spring operating mechanism in the prior art, the structure is simple, the types of components are few, and the difficulty of installation and maintenance is reduced.

However, in the patent application for this invention, the coil frame only has two positions of closing and opening, and the coil frame can only be in the closing or opening position after being powered on. On the bottom of the mechanism frame, the switch is in the opening or closing position at this time. The invention patent application cannot realize the three-station operation, which does not match the three-station operation requirements of the main body. The three-position isolation and grounding switch usually includes a switch body, and the switch body includes a moving end. During the movement, the moving end includes an isolation closing position connected to the static end, an opening position separated from the moving end, and a grounding closing position for grounding closing. bit.

Contents of the invention

The purpose of the present invention is to provide a three-position isolating grounding switch to solve the problem that the magnetic force operating mechanism in the prior art cannot meet the three-position operation requirements.

In order to achieve the above object, the technical scheme of the magnetic operating mechanism for the three-station isolating grounding switch of the present invention is: a three-station isolating and grounding switch, comprising a body with a moving end, the moving end has an isolating closing position, an opening position and The grounding closing position also includes a magnetic operating mechanism connected to the moving end transmission. The magnetic operating mechanism includes a mechanism frame and at least two fixed permanent magnets that form a magnetic field gap in the mechanism frame. The magnetic field gap is provided with After electrification, it can move up and down and drive the electromagnetic coil of the moving end. The electromagnetic coil has a first limit position, a second limit position and a middle position in the moving stroke, and the first limit position, the second limit position and the middle position. One of them corresponds to the isolation closing position of the moving end, one of them corresponds to the opening position of the moving end, and the other corresponds to the grounding closing position of the moving end. The elastic support between the upper end and/or lower end of the electromagnetic coil and the mechanism frame An elastic member that applies force to the coil and holds the solenoid coil in the neutral position after stretching to a set length.

The three-position isolating grounding switch provided by the present invention includes a switch body and a magnetic operating mechanism, the switch body includes a moving end, and the moving end has an isolation closing position, an opening position and a grounding closing position, and the mechanism frame of the magnetic operating mechanism, The guide movement on the mechanism frame is equipped with a power output end connected with the drive of the moving end. There is a fixed permanent magnet in the mechanism frame. The fixed permanent magnet forms a magnetic field gap with the moving direction of the power output end. The electromagnetic coil moves back and forth in the direction. The electromagnetic coil has a first limit position, a second limit position and an intermediate position during the movement process. One of the three corresponds to the isolation closing position of the moving end, and one of the remaining two corresponds to the closing position of the moving end. The opening position of the moving end corresponds, and the other of the remaining two corresponds to the grounding closing position of the moving end. The electromagnetic coil can be kept in the middle position under the action of the elastic member or the resultant force of the elastic member and the electromagnetic coil. The magnetic operating mechanism of the three-position isolation grounding switch provided by the present invention enables the electromagnetic coil to have three exact working positions, and can realize the three-position operation of the three-position isolation grounding switch through the control of the electromagnetic coil.

Further, the middle position of the electromagnetic coil corresponds to the opening position of the moving end, one of the first and second limit positions corresponds to the isolation closing position of the moving end, and the other corresponds to the grounding closing position of the moving end.

Further, the mechanism frame is provided with a coil frame fixedly connected with the power output end and provided with the electromagnetic coil. The coil frame has a first end of the coil frame and a second end of the coil frame along the moving direction of the electromagnetic coil. The first end of the coil frame is The elastic member is elastically supported between the end and/or the second end of the coil frame and the mechanism frame, and the power output end is fixedly connected to the first end of the coil frame.

Further, the elastic member elastically supported between the first end of the coil frame and the mechanism frame and between the second end of the coil frame and the mechanism frame is a compression spring.

Further, the power output end includes a connecting rod fixed on the first end of the coil frame and guided to move and assembled on the mechanism frame, and the compression spring corresponding to the first end of the coil frame is sleeved on the connecting rod.

Further, a compression spring positioning column is provided on the second end of the coil frame, and one end of the compression spring corresponding to the second end of the coil frame is positioned and sleeved on the compression spring positioning column.

Further, the power output end also includes a mechanism output rod arranged on one end of the connecting rod outside the mechanism frame, and the mechanism output rod is connected to the driving end through a rack and pinion mechanism.

Further, the three-position isolating grounding switch includes a mechanism controller that controls the magnitude and direction of the input current of the magnetic operating mechanism, and also includes an upper controller that outputs control signals to the mechanism controller.

Description of drawings

Fig. 1 is a schematic diagram of Embodiment 1 of a three-position isolating grounding switch of the present invention;

Fig. 2 is the schematic diagram of magnetic force operating mechanism in Fig. 1;

Fig. 3 is a schematic diagram of the magnetic force operating mechanism in Embodiment 3 of the three-position isolating grounding switch of the present invention;

Fig. 4 is a schematic diagram of the magnetic operating mechanism in Embodiment 4 of the three-position isolating grounding switch of the present invention.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The first specific embodiment of the three-position isolating grounding switch of the present invention, as shown in Figures 1 to 2, the three-positioning isolating and grounding switch includes a body 1 and a magnetic operating mechanism 2, and the body 1 includes a moving end and a magnetic operating mechanism. The mechanism 2 is connected by transmission and rotates under the drive of the magnetic operating mechanism to realize the transmission shaft of the opening, isolation closing and grounding closing operations. The mechanism controller 5 that controls the action of the magnetic operating mechanism and the upper controller 6 that issues commands for opening, isolating and grounding to the mechanism controller, and both the mechanism controller 5 and the upper controller 6 are located in the mechanism box 4 .

As shown in Figure 2, the magnetic force operating mechanism 2 includes a mechanism frame 7, and a left permanent magnet 9, a middle permanent magnet 8 and a right permanent magnet 10 are arranged in sequence along the left and right directions in the mechanism frame 7, wherein the left permanent magnet 9 and the middle permanent magnet A first magnetic field gap is formed between the magnets 8, a second magnetic field gap is formed between the middle permanent magnet 8 and the right permanent magnet 10, and the directions of the parallel magnetic fields of the first magnetic field gap and the second magnetic field gap are opposite. A coil frame 11 is sleeved on the middle permanent magnet 8, and an electromagnetic coil is wound on the coil frame 11. In the present embodiment, the coil frame 11 is in a square shape, and the electromagnetic coil wound on the coil frame includes a coil positioned in the first magnetic field gap The first part and the second part of the coil located in the second magnetic field gap, wherein the extension directions of the first part of the coil and the second part of the coil correspond to the direction of the magnetic field perpendicular to the first magnetic field gap and the second magnetic field gap. When the coil is energized, the coil frame 11 can move up or down.

The coil frame 11 is provided with four connecting rods 15 extending in the up and down direction, the upper ends of the connecting rods 15 are guided out from the mechanism frame 7, and the upper ends of the connecting rods 15 are provided with a mechanism output rod 16, the mechanism output rod 16 is The rack and pinion structure drives the transmission shaft of the main body to rotate through the rack and pinion transmission mechanism, and then drives the moving end of the main body to complete the isolation closing, opening and grounding closing operations.

An upper compression spring 12 is sheathed outside the connecting rod 15 , and the upper compression spring 12 is elastically supported between the coil frame 11 and the mechanism frame 7 . The lower end of the coil frame 11 is provided with a clip spring positioning post 14, the clip spring positioning post 14 is covered with a lower clip spring 13, and the mechanism frame 7 is provided with a clip spring positioning post corresponding to the clip spring positioning post of the coil frame. One end of the compression spring 13 can be sleeved on the compression spring positioning column, and the lower compression spring 13 is elastically supported between the lower end of the coil frame 11 and the mechanism frame 7 .

The coil frame 11 can be suspended and kept at a fixed position by the bidirectional action of the upper compression spring 12 and the lower compression spring 13, and the coil frame can be kept in the middle position by changing the force value of the compression spring. When the coil frame 11 is in the middle position, the three-station isolating grounding switch is in the opening position, passing current to the coil can make the coil frame move upwards to realize the isolation and closing operation of the three-station isolating and grounding switch, and the coil is supplied with reverse The current can make the coil frame move down to realize the grounding closing operation of the three-position isolating grounding switch. In the present invention, the compression springs are elastically supported between the upper end and the lower end of the coil frame and the mechanism frame, so that the coil frame 11 has three exact working positions, which facilitates the control of the stroke of the coil frame 11 .

In the present invention, the magnetic operating mechanism is fixed on the body through a flange, and the magnetic operating mechanism is connected with the mechanism controller through a cable, and the upper controller and the mechanism controller are placed in the mechanism box 4 together.

The working process of the three-position isolation and grounding switch is as follows: in the initial state, the coil frame 11 is in the middle position, and the three-position isolation and grounding switch is in the open position. When isolating and closing, the upper controller 6 issues an isolating and closing instruction to the mechanism controller 5, and the mechanism controller 5 judges according to the received instruction that the coil in the magnetic operating mechanism 2 should be input with a corresponding direction and a corresponding magnitude of current, and the coil The frame 11 moves according to the ampere force it receives, and the direction of movement is consistent with the direction of the force. The direction of the force can be judged according to the left-hand rule. The movement distance depends on the magnitude of the current. The greater the current, the greater the ampere force, and the compression of the upper compression spring 12. When the coil frame 11 moves up to the upper limit position, the three-position isolating and grounding switch is in the isolation and closing state, and the coil remains energized to keep the three-position isolating and grounding switch in the isolation and closing state.

When opening the brake, the upper controller sends an opening instruction to the mechanism controller, and the mechanism controller judges according to the received instruction that the coil in the magnetic operating mechanism should input a corresponding direction and a corresponding magnitude of current. The direction of current flow is reversed when the isolation is closed. The coil frame 11 moves downward to the equilibrium position under the action of the upper compression spring 12 and the received ampere force, and at this time the upper compression spring 12 is completely released, and the ampere force generated by the incoming current is not enough to make the coil frame 11 continue to move down By compressing the lower compression spring 13 and stretching the upper compression spring 12, the coil frame 11 is kept in a balanced position.

When grounding and closing, a current in the same direction that is greater than that of opening is passed into the coil, so that the coil frame 11 compresses the lower compression spring 13 under the action of the ampere force to realize the grounding closing operation. When the coil frame 11 moves down to the lower limit position, the three-position isolating and grounding switch is in the grounding closing state, and the coil remains energized to keep the three-station isolating and grounding switch in the grounding and closing state. The state when the grounding switch is turned into an open switch is similar to the state when the isolation switch is switched to an open switch, but the direction of the current flowing in is opposite.

The upper controller involved in the present invention includes a human-computer interaction system and an integrated display processor. The upper controller communicates with the mechanism controller through optical fiber. The upper controller can issue instructions to the mechanism controller, and can also read and receive mechanism control. The status information and feedback information of the magnetic actuator are used to monitor the real-time status of the magnetic actuator, and these data are uploaded to the background of the power grid system through the IEC61850 communication protocol or stored in the host controller for user reference.

In this embodiment, when the coil frame is in the middle position, the electromagnetic coil is in the middle position, and the moving end is in the opening position at this time; Move down until the moving end is in the grounding closing position, and the electromagnetic coil is in the second limit position.

The second specific embodiment of the three-position isolating grounding switch of the present invention is different from the above-mentioned embodiment in that the corresponding relationship between the positions of the electromagnetic coil and the positions of the moving end is different, for example, the middle position of the electromagnetic coil corresponds to the isolation and closing of the moving end. Brake position, the first limit position of the electromagnetic coil corresponds to the opening position of the moving end, and the second limit position of the electromagnetic coil corresponds to the grounding closing position of the moving end.

The third specific embodiment of the three-position isolating grounding switch of the present invention, as shown in FIG. Between the coil frame 11 and the mechanism frame 7 , and not sleeved on the connecting rod 15 .

In the foregoing embodiments, the upper and lower compression springs are elastic members.

The specific embodiment four of the three-position isolating grounding switch of the present invention, as shown in FIG. An elastic piece 16 is arranged between the lower end and the mechanism frame 7, and the elastic piece 16 can be a metal sheet with elastic properties, etc., and the electromagnetic coil can be kept in the middle position by stretching and compressing the elastic piece 16. In other embodiments, the elastic member can be a tension spring or a compression spring, and when the ampere force received by the electromagnetic coil is the same as the force of the elastic member, the electromagnetic coil can be kept in the middle position.

The fifth embodiment of the three-position isolating grounding switch of the present invention differs from the fourth embodiment in that the elastic member is only arranged between the upper end of the coil frame and the mechanism frame.

In the above embodiments, the upper end of the coil frame is the first end of the coil frame, and the lower end of the coil frame is the second end of the coil frame. The connecting rod and the mechanism output rod together constitute the power output end.

Claims (4)

1. A three-position isolation and grounding switch, comprising a body with a moving end, the moving end has an isolation closing position, an opening position and a grounding closing position, and also includes a magnetic operating mechanism, which includes a mechanism frame and a guide Move the power output end connected to the moving end transmission assembled on the mechanism frame. A fixed permanent magnet forming a magnetic field gap extending along the moving direction of the power output end is arranged in the mechanism frame. An electromagnetic coil that can reciprocate along the extension direction of the magnetic field gap is characterized in that: the electromagnetic coil has a first limit position and a second limit position located at both ends on the stroke of reciprocating movement, and also has a position located at the first limit position and the second limit position. The middle position between the limit positions, one of the first limit position, the second limit position and the middle position corresponds to the isolation closing position of the moving end, one of the remaining two corresponds to the opening position of the moving end, and the remaining two The other one corresponds to the grounding closing position of the moving end. The magnetic operating mechanism also includes an elastic member that applies force to the electromagnetic coil and keeps the electromagnetic coil in the middle position when the length is stretched and set; the mechanism frame is equipped with The power output end is fixedly connected to the coil frame provided with the electromagnetic coil. The coil frame has a first end of the coil frame and a second end of the coil frame along the moving direction of the electromagnetic coil. The first end of the coil frame and the second end of the coil frame are connected with the mechanism The elastic member is elastically supported between the frames, and the power output end is fixedly connected to the first end of the coil frame; the elastic support is between the first end of the coil frame and the mechanism frame and between the second end of the coil frame and the mechanism frame The elastic member is a compression spring; the power output end includes a connecting rod fixed on the first end of the coil frame and guided to move and assembled on the mechanism frame, and the corresponding compression spring at the first end of the coil frame is sleeved on the connecting rod ; The second end of the coil frame is provided with a compression spring positioning column, and one end of the compression spring corresponding to the second end of the coil frame is positioned and sleeved on the compression spring positioning column. 2. The three-position isolating grounding switch according to claim 1, characterized in that: the middle position of the electromagnetic coil corresponds to the opening position of the moving end, and one of the first and second limit positions corresponds to the isolation closing position of the moving end Correspondingly, the other corresponds to the grounding closing position of the moving end. 3. The three-position isolating grounding switch according to claim 1, characterized in that: the power output end also includes a mechanism output rod arranged on one end of the connecting rod outside the mechanism frame, and the mechanism output rod passes through the rack-and-pinion mechanism Connected with the drive end drive. 4. The three-position isolation grounding switch according to any one of claims 1-3, characterized in that: the three-position isolation grounding switch includes a mechanism controller that controls the magnitude and direction of the input current of the magnetic operating mechanism, and also includes a The mechanism controller outputs the upper controller of the control signal.