RU2542718C2 - Vacuum switch with three component drive - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: vacuum switch contains three poles with vacuum arc chutes installed on the casing. Two electromagnetic drives with magnetic locks are installed on the same casing between the middle and outmost insulation tie-rods of the poles, at that the movable parts of the drives are connected with the insulation tie-rods of the arc chutes by common tie-rod. The third magnetic drive contains two detachable blocks, at that the first block is connected with casing, and second block - with common tie-rod. Minimum one block of the third magnetic drive contains a permanent magnet.

EFFECT: increased switch on/off speed of the switch due to increased speed of movement of the drive mechanical parts, and assurance of high vibration and impact strength of the switch in off position.

5 cl, 3 dwg

Description

The invention relates to electrical engineering, namely, electrical switching apparatus engineering, in particular to vacuum circuit breakers.

Known "Switch with electromagnetic control" JP 2006-049247 [1], containing vacuum chambers with three poles arranged in a line relative to each other with a certain interval. Electromagnetic actuators are located on the surface of the housing, parallel to the vacuum valves. Electromagnetic actuators are at least partially placed in the bulk regions between the vacuum chambers alternately in a stepwise manner.

A disadvantage of the known design is the lack of compactness of the device.

Closest to the claimed technical solution is "HIGH-VOLTAGE SWITCH WITH ELECTROMAGNETIC DRIVE" RU 2282266 [2], containing three poles with vacuum arc chambers mounted on the housing, an electromagnetic driving device mounted on the same housing, and its movable part is connected to insulating rods vacuum interrupter chambers with a common thrust, the electromagnetic drive device contains two electromagnetic drives mounted in a row with the poles between the middle and extreme drafts.

Known vacuum circuit breaker has a greater compactness compared to [1].

A disadvantage of the known device is the increased shutdown time, due to the fact that during shutdown, only the spring force of the return springs acts on the shutdown drive. At the same time, during the start-up process, the action of the return springs reduces the total force exerted by the start-up drive to the mechanical moving parts, which leads to a decrease in the time characteristics of the start-up of the drive. The use to turn off only the elastic forces of the return springs leads to the need to increase their stiffness, which leads to the need to increase the dimensions of the drive as a whole. In addition, the disadvantage of the known drive is low vibration and shock resistance in the off state.

The technical result of the proposed design solution is to increase the speed of movement of the mechanical parts of the drive when turning on and off the vacuum circuit breaker, as well as increasing the vibration and shock resistance of the circuit breaker in the off state.

The technical result is achieved by the fact that a vacuum circuit breaker containing three poles with vacuum interrupter chambers mounted on the housing, two electromagnetic actuators with magnetic latches installed on the same housing, the movable parts of the actuators connected to the insulation rods of the vacuum interrupter chambers with a common traction, two electromagnetic the drive is installed between the middle and extreme insulating poles of the poles, characterized in that it further comprises a third magnetic drive containing two p to be connected, the first block is connected to the housing, the second block is connected to a common rod, and at least one of the blocks of the third magnetic drive contains a permanent magnet.

The total thrust can be performed with an axis located offset to the housing wall, and the third magnetic drive can be offset to the opposite wall of the drive housing. The offset of the third electromagnetic drive to the opposite side from the axis of the drive will reduce the size of the drive due to the optimal location inside the housing, and by reducing the size of the magnetic parts of the third magnetic drive.

The third magnetic drive can be positioned so that the position of the closed magnetic circuit of two electromagnetic drives with magnetic latches corresponds to the on position of the vacuum circuit breaker, and the position of the closed magnetic circuit of the third magnetic drive corresponds to the off position of the vacuum circuit breaker. With the indicated mutual arrangement of the elements of the third magnetic drive, a high compactness of the device is achieved while maintaining acceptable reliability.

The second block of the third magnetic drive can be made of two metal ferromagnetic parallelepipeds, between which there is a permanent magnet, and the first block can contain a metal ferromagnetic parallelepiped. The specified configuration of the magnetic cores and magnets allows to reduce the mass of the permanent magnet with sufficient force of the magnetic system.

The first block of the third magnetic drive can be configured to rotate the plane of the parallelepiped. The specified implementation will increase the clamping force of the first block of the third magnetic drive to the first, which will further increase the separation force and the reliability of the fixation of the drive in the off position.

A vacuum circuit breaker manufactured using claims 1 to 5 is shown in FIG. 1 (longitudinal section in the on state), FIG. 2 (longitudinal section in the off state), FIG. 3 (bottom view), where:

1 - housing;

2 - total thrust;

3 - insulating rod of a vacuum interrupter chamber;

4 - the first block;

5 - the second block;

6 - return spring;

7 - two ferromagnetic parallelepipeds of the second block;

8 - permanent magnet;

9 - axis of general thrust.

The device operates as follows.

Three poles with vacuum interrupter chambers and two electromagnetic drives with magnetic latches (not shown) connected to a common rod 2 with insulating rods 3 of the vacuum chambers (a pole rod located in the center of the case are shown) are fixed on the housing 1. The first block 4 is mounted on the housing in any known manner. The second block 5 is mounted on a common rod 2. A return spring 6 is installed around the insulating rod of the vacuum interrupter chamber 3. A permanent magnet 8 is located between two metal ferromagnetic parallelepipeds 7. The axis of the general rod 9 is displaced to the wall of the housing 1. When the vacuum circuit breaker is on, the common rod 2 is fixed by magnetic latches located in the electromagnetic drives. When the state is off, the common rod 2 is fixed by the third magnetic drive, the movable part of which (second block) is connected by closing the magnetic flux to the fixed part (first block), reliably fixing the general rod of the drive in the off position.

The technical result is an increase in the speed of movement of the mechanical parts of the drive when the vacuum circuit breaker is turned on is achieved by a non-linear dependence of the efforts of the third drive on the coordinate of movement. When you turn on there is an increase in the strength of the electromagnetic drive. When a certain coordinate is reached (about half the working stroke of the common traction), the force of the third magnetic drive, counteracting the switched on electromagnetic drive, sharply weakens, due to a sharp decrease in the counteracting force of the electromagnetic drive, the general traction receives additional acceleration, increasing the speed of the vacuum circuit breaker.

The technical result is an increase in the speed of movement of the mechanical parts of the drive when the vacuum circuit breaker is turned off is achieved by a non-linear dependence of the efforts of the third drive on the coordinate of movement. When the coordinate of the drive reaches about half of the working stroke of the total thrust, there is a sharp increase in the force developed by the third magnetic drive, which increases the shutdown speed of the vacuum circuit breaker.

EFFECT: increased vibration and shock resistance of the circuit breaker in the off state is achieved due to the large value of the pressing force of the fixed part of the magnetic circuit (first block) to the moving part of the third magnetic drive (second block), which reliably fixes the common traction and movable pole traction.

Industrial application

The invention can be successfully applied in the manufacture of vacuum circuit breakers with increased speed on and off, as well as high vibration and shock resistance in the off state.

Claims (5)

    1. A vacuum circuit breaker containing three poles with vacuum interrupter chambers mounted on the housing, two electromagnetic actuators with magnetic latches mounted on the same housing, the movable parts of the actuators connected to the insulation rods of the vacuum arrester chambers by a common traction, two electromagnetic actuators are installed between the middle and extreme insulating poles of poles, characterized in that it further comprises a third magnetic drive containing two separable blocks, the first block is connected to housing, the second block is connected to a common rod, and at least one of the blocks of the third magnetic drive contains a permanent magnet.     2. The vacuum switch according to claim 1, characterized in that the common thrust is made with an axis located offset to the housing wall, and the third magnetic drive is biased to the opposite wall of the drive housing.     3. The vacuum switch according to claim 1, characterized in that the third magnetic drive is arranged so that the position of the closed magnetic circuit of two electromagnetic drives with magnetic latches corresponds to the on position of the vacuum circuit breaker, and the position of the closed magnetic circuit of the third magnetic drive corresponds to the off position of the vacuum circuit breaker.                4. The vacuum switch according to claim 1, characterized in that the second block of the third magnetic drive is made of two metal ferromagnetic parallelepipeds, between which there is a permanent magnet, and the first block contains a metal ferromagnetic parallelepiped.     5. The vacuum switch according to claim 1, characterized in that the first block of the third magnetic drive is rotatable.

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