RU97210U1 - AUTOMATIC SWITCH CONTROL MECHANISM - Google Patents

Abstract

 The control mechanism of the circuit breaker, comprising a spring-loaded rotary handle mounted in the circuit breaker housing, in which the rod is pivotally mounted, a movable contact mounted on a fixed axis, mounted in the circuit breaker housing, a spring providing contact pressing and opening, a rail, characterized in that it is equipped with a trip mechanism made in the form of two links rotatably connected, the first link connected to the indicator being pivotally connected to the handle through the rod and filled with a protrusion for engagement with the rail, the second link connected to the movable contact, and the rail, spring-loaded relative to the second link, are mounted on the same axis with the movable contact, while the movable contact on the specified axis is held by the groove with the possibility of rotation around it and movement.

Description

The invention relates to electrical engineering, in particular to low-voltage circuit breakers, designed to protect electrical circuits and consumers of electric energy from short circuit currents and overload currents, conducting currents in normal conditions, as well as for infrequent operational on and off electrical circuits.

The known control mechanism of a circuit breaker from the description of the invention to patent RU No. 20146440, IPC Н01Н 73/00, 1994.07.15, comprising a spring-loaded rotary handle mounted in a switch housing in which a rod is pivotally mounted, a movable contact mounted on an axis mounted in the switch case , a spring providing contact pressing of the contacts and opening, a trip lever that disconnects the rail.

The disadvantages of the known control mechanism is:

- the complexity of the design and technology of its manufacture;

- a large tripping force on the rail leads to unstable operation of the thermal release and unreliable operation of the control mechanism of the circuit breaker during operation.

The problem the utility model is aimed at is creating a design of a control mechanism for a circuit breaker, which makes it possible to increase the reliability and stability of operation of a circuit breaker.

The proposed control mechanism of the circuit breaker contains a spring-loaded rotary handle mounted in the circuit breaker housing, in which the rod is pivotally mounted, a movable contact mounted on an axis fixed in the circuit breaker housing, a spring providing contact contact pressing and opening and rail simultaneously.

What is new is that the control mechanism of the circuit breaker is equipped with a trip mechanism made in the form of two links rotatably connected. The first link connected to the position indicator is pivotally connected to the handle through the rod and is made with a protrusion for engagement with the rail. The second link connected to the movable contact and the rail, spring-loaded relative to the second link, are mounted on the same axis as the movable contact, while the movable contact on the specified axis is held by the groove with the possibility of rotation around it and movement.

The utility model, due to the fact that the control mechanism of the circuit breaker is equipped with a trip mechanism made in the form of two links rotatably connected, the first link connected to the position indicator, pivotally connected to the handle through the rod and made with a protrusion for engagement with the rail and the second link connected to the movable contact and the rail spring-loaded relative to the second link are mounted on the same axis as the movable contact, while the movable contact on the specified axis is held pa zom with the possibility of rotation around it and moving, improves the reliability and stability of operation of the control mechanism of the circuit breaker during operation. In the proposed control mechanism of the circuit breaker, the movable contact moves forward even after contact with the fixed contact, further stretching the spring, i.e. the movable contact is shifted by a certain distance, which determines the necessary contact pressing and, as a result, the guarantee of the reliability of the contacts at a given number of on-off switches.

Figure 1 shows a circuit breaker in which the inventive control mechanism of a circuit breaker is installed without a cover;

figure 2 shows the control mechanism of the circuit breaker in the "on" position without position indicator;

figure 3 shows the control mechanism of the circuit breaker in the "on" position with the position indicator installed;

figure 4 shows the control mechanism of the circuit breaker in the "off" position without position indicator;

figure 5 shows the control mechanism of the circuit breaker in the off position with the position indicator installed.

The control mechanism of the circuit breaker (see Fig. 1) contains a spring-loaded rotary handle 2 mounted in the housing 1, in which the rod 3 is pivotally mounted, a trip mechanism, a rail 4, a movable contact 5 mounted on an axis 6 mounted in the circuit breaker housing 1. The spring 7 provides simultaneous contact pressing and opening of the movable 5 and fixed 5 ^I contacts with the protruding horn 8, one end of the spring 7 is installed in the hole 9 of the movable contact 5, and its other end is connected to the pin 10 of the switch housing 1. The trip mechanism is made in the form of two links 11 and 11 ^I , interconnected through a rivet 12 with the possibility of rotation (see figure 1 and figure 2). In the first link 11 connected to the position indicator 13, the second end of the rod 3 is pivotally mounted. On the same axis 6 with the movable contact 5 there is a rail 4 and a second link 11 ^{I of the} trip mechanism connected to the movable contact 5 by means of a rivet 14. The rail 4 is spring loaded 15 relative to the second link 11 ^I. The movable contact 5 is held by the groove 16 (see figure 2) on the axis 6 with the possibility of rotation around it and movement. The first link 11 of the trip mechanism (see FIG. 2) has a protrusion 17, and the trip rail 4 has a recess 18 for engaging the first link 11 with the rail 4.

The circuit breaker (see Fig. 1) has a thermal release 19 installed with the possibility of influencing the movable contact 5 through the rod 20. The electromagnetic release 21 is installed with the possibility of influencing the movable contact 5 by the rod 22. The switch has an arcing chamber 23 mounted between the arcing horn 8 and bracket 24.

In the on position (see FIG. 2 and FIG. 3), the spring-loaded rotary handle 2 is in the extreme left position, abutting against the housing 1. The first link 11 of the release mechanism is pivotally connected to the rotary spring-loaded handle 2 through the link 3 in the engaged position with a rail 4. By means of a spring 7 (not shown in FIG. 3 and FIG. 3), the movable contact 5 receives a load with respect to the fixed contact 5 ^I. Contacts are in a closed position. The position indicator 13 is “red”.

In the “off” position (see FIG. 4 and FIG. 5), when the circuit breaker is tripped, the rail 4, spring-loaded with a spring 16, rotates, as a result of which the second link 11 ^I rotates. In the process of further rotation, the protrusion 17 of the first link 11 of the trip mechanism is engaged in the recess 18 of the rail 4 and facilitates the movement of the movable contact 5 from the stationary contact 5 ^I and the circuit opens. The position indicator 13 is green.

The mechanism works as follows.

To quickly turn on the switch, the handle 2 is turned to the extreme position counterclockwise. The handle 2 through the rod 3 drives the first link 11 of the release mechanism, which then engages with the river 4. Since the rail 4 is spring-loaded relative to the second link 11 ^{I of the} release mechanism via a spring 15 fixed to the second link 11 ^{I of the} release mechanism, with further movement of the handle 2, the movable contact 5 is rotated relative to the axis 6 and goes into a closed position with a fixed contact 5 ^I.

To quickly turn off the switch, the handle 2 is rotated in the opposite direction.

When the short-circuit current flows, the electromagnetic release 21 is activated, which acts by the rod 22 on the rail 4, spring-loaded with a spring 15 relative to the second link 11 ^{I of the} trip mechanism, and rotates it. Rail 4 releases the first link 11 of the trip mechanism. Under the influence of the spring 7, the movable contact 5, being held by the groove 16 on the axis 6, mounted in the housing 1, rotates and comes into the open position.

When overload currents on the rail 4 acts thermal release 19, which with increasing magnitude of the current flowing through it, bends and through the rod 20 turns it. Under the action of the spring 7, the movable contact 5, being held by the groove 16 on the axis 6, mounted in the housing 1, rotates and comes into the open position.

Claims (1)

The control mechanism of the circuit breaker, comprising a spring-loaded rotary handle mounted in the circuit breaker housing, in which the rod is pivotally mounted, a movable contact mounted on a fixed axis, mounted in the circuit breaker housing, a spring providing contact pressing and opening, a rail, characterized in that it is equipped with a trip mechanism made in the form of two links rotatably connected, the first link connected to the indicator being pivotally connected to the handle through the rod and filled with a protrusion for engagement with the rail, the second link connected to the movable contact, and the rail, spring-loaded relative to the second link, are mounted on the same axis with the movable contact, while the movable contact on the specified axis is held by the groove with the possibility of rotation around it and movement.