RU2402832C1 - Vacuum switch - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: "breaking" lever fixture is composed of supports positioned on the arm ends adjoining the central hinge. Presence of the supports at the specified location enable fixation of the "breaking" lever in the apart position without additional fixture mechanisms. The vacuum switch may contain an electromagnetic pusher. The electromagnetic pusher may operate either jointly with the common shaft drive or individually. In case of individual application of the electromagnetic pusher it may act as the common shaft drive. The vacuum switch may additionally contain a tripping mechanism impacting on the hinge area towards intersection of the axis of the central hinge of the line connecting the hinge connected to the body and the hinge connected to the common shaft. When the said force is applied to the hinge area the central hinge passes the point of maximum distance between the utmost hinges; having passed it becomes folded under the shaft impact. The tripping mechanism drive may be of electrical, mechanical or combined type.

EFFECT: design simplification resulting in fabrication cost reduction and operational reliability improvement and inertance reduction resulting in reduction of the mechanism response time; possibility of manual tripping of the vacuum switch.

5 cl, 2 dwg

Description

The invention relates to electrical engineering, namely to high-voltage apparatus engineering, and for the construction of high-voltage circuit breakers with vacuum interrupter chambers.

The well-known "Drive high-voltage circuit breaker" SU 1775743 [1], containing a mechanism with a pusher mounted on a fixed base, a free trip mechanism, including a breaking lever, consisting of two arms pivotally connected to each other, one of which is connected to the lever of the circuit breaker shaft , the other shoulder at its end is placed with the possibility of reciprocating movement and with the possibility of fixing the extreme position of the latch shut off.

A disadvantage of the known design is the high complexity of the design, involving six hinges. High design complexity leads to increased cost and low reliability.

The closest to the claimed technical solution in the field of electromagnetic drive is the "VACUUM SWITCH" RU 2224318 [2], containing a common shaft and mounted on the base (body) of the vacuum arcing chambers, each of which has a fixed contact and a movable contact connected to an insulating rod, each chamber is equipped with an insulating rod actuator, while the switch is equipped with a common contact locking device for all arc chambers, containing a “breaking” lever of two leche, one end of the arm is pivotally connected to the housing, the other end of the other arm is pivotally connected to a common shaft, the opposite ends of said arms are interconnected by a central hinge.

A disadvantage of the known design is the high complexity of the design, providing for five hinges. High design complexity leads to increased manufacturing costs and low reliability. In addition, the high inertia of the mechanism, consisting of four moving parts with a significant inertial mass, reduces the response time, which affects the consumer properties of vacuum circuit breakers. The disadvantage is the lack of a mechanical switch that allows you to turn off the switch in case of failure of the electrical tripping mechanism.

The technical result of the invention is to simplify the design, leading to lower manufacturing costs and increased reliability in operation. The technical result is also the reduction of inertia, leading to a decrease in the response time of the mechanism, which is very important for vacuum circuit breakers. An additional result is the ability to manually open the vacuum circuit breaker.

The technical result is achieved by the fact that the latch of the “breaking” lever is made in the form of stops located at the ends of the shoulders adjacent to the central hinge.

The presence of stops in the specified location allows you to fix the position of the “breaking” lever in the extended position without additional locking mechanisms, which simplifies the design and reduces its inertia.

The stops can be clamped to each other after crossing the axis of the central hinge of the line connecting the hinge connected to the housing and the hinge connected to a common shaft. The specified execution of the stops allows the mechanism to be automatically fixed after crossing the specified axis, since the mechanism passes the point of greatest distance between the hinge connected to the shaft and the hinge connected to the body (when the shoulders are located along the line connecting all three hinges of the locking mechanism). To remove the locking (turning off) of the vacuum circuit breaker, it is necessary to apply force to pass the central hinge through the specified point.

The vacuum switch may include an electromagnetic pusher. The electromagnetic pusher can work both in conjunction with a common shaft drive, and independently. With the independent use of the electromagnetic pusher, it can perform the functions of a common shaft drive.

The vacuum switch may further comprise a trip mechanism acting on the hinge region in the direction of intersection of the axis of the central hinge of the line connecting the hinge connected to the housing and the hinge connected to a common shaft. When this force is applied to the hinge area, the central hinge passes the maximum point of the distance between the extreme hinges and, after passing it, folds under the influence of the shaft. The shutdown mechanism can be electric, mechanical or combined.

The shutdown mechanism may be a spring-loaded button. The button in this case can be installed in the side wall of the housing. The shutdown button allows you to turn off the vacuum circuit breaker manually, which increases the functionality of the vacuum circuit breaker.

The proposed vacuum circuit breaker in the context using PP 1-4 shows: the state is “on” in figure 1, and the state is “off” in figure 2, where:

1 - vacuum interrupter chambers;

2 - a common shaft;

3 - fixed contact;

4 - movable contact;

5 - insulating rod;

6 - drive insulating rod;

7 - hinge connected to the housing;

8 - hinge connected to a common shaft;

9 - the central hinge;

10 - emphasis;

11 - axis connecting the hinge mounted on the housing, and the hinge connected to a common shaft;

12 - shutdown button;

13 - electromagnetic drive lock;

14 - case.

The device operates as follows. In the on state (shown in figure 1), the stops 10 are pressed against each other, preventing the common shaft 2 from moving down in the figure. The shaft 2 is in the upper position, acting on the actuators of the insulating rods 6, and through the insulating rods 5 presses the movable contacts 4 to the fixed contacts 3. The mechanical force directed upward in the figure is sequentially transmitted from the hinge connected to the housing 7 through the stops 10 k the hinge connected to the common shaft 8, to the common shaft 2. The common shaft 2 through the actuators of the insulating rods 6 transfers the forces directed upward to the insulating rods 5, the insulating rods 5 transmit forces to the movable contacts 4. Movable contacts 4 in The “on” state transfers forces to the fixed contacts 3, which, in turn, transmit forces to the vacuum arcing chambers. Vacuum interrupter chambers are rigidly mounted on the housing of the vacuum circuit breaker 14, which transfers forces from the vacuum chambers to the hinge connected to the housing 7.

To turn off the vacuum circuit breaker, it is necessary to apply a force directed to the left according to the figure to the central part of the “breaking” lever, in the region of the central hinge. The force can be applied, for example, by an electromagnetic shutdown drive (not shown) or by a mechanical button 12, as shown in FIG. 1 and FIG. 2. When the central hinge 9 of the axis connecting the hinge mounted on the housing 7 and the hinge connected to the common shaft 8 passes, the resultant forces from the upper and lower (according to the figure) levers directed to the right according to the figure will act on the central hinge 9. If there are no obstacles, the central hinge will move to the right according to the figure, while the common shaft 2 will lower down, moving the insulation rods 5 down through the drives of the insulating rods 6. The movable contacts 4 in this case move down, breaking the electric circuit between contacts 3 and 4. The vacuum circuit breaker in this case comes to the “off” position.

Industrial application

The invention can be successfully applied for the manufacture of vacuum circuit breakers.

Claims (5)

1. A vacuum circuit breaker containing a common shaft and vacuum arcing chambers installed on the housing, each of which has a fixed contact and a movable contact connected to the insulating rod, each chamber is equipped with an insulating rod drive, and the circuit breaker is equipped with a closed position lock common to all arcing chambers contacts containing a “breaking” lever from two shoulders, one of the ends of the shoulder is pivotally connected to the housing, the other end of the other shoulder is pivotally connected to a common shaft, opposite said ends of the shoulders are interconnected by a central hinge, characterized in that the latch of the “breaking” lever is made in the form of stops located at the ends of the shoulders adjacent to the central hinge. 2. The vacuum switch according to claim 1, characterized in that the stops are made to be pressed against each other after crossing the axis of the central hinge of the line connecting the hinge connected to the housing and the hinge connected to a common shaft. 3. The vacuum switch according to claim 1, characterized in that it contains an electromagnetic pusher. 4. The vacuum switch according to claim 1, characterized in that it further comprises a trip mechanism acting on the hinge region in the direction of intersection of the axis of the central hinge of the line connecting the hinge connected to the housing and the hinge connected to a common shaft. 5. The vacuum switch according to claim 3, characterized in that the shutdown mechanism is a spring-loaded button.

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