RU2351033C2 - Low-voltage vacuum contactor - Google Patents

Abstract

FIELD: electrics.

SUBSTANCE: invention concerns low-voltage and high-voltage electric devices and can be applied in electric chains for remote control of electric aggregates and networks. Effect is achieved by deactivation spring and lever stop disconnection and reposition in optimum location. For that effect, vacuum contactor including mainly three vacuum arc blowout chutes, electric magnet, case, sealing lever with electric magnet armature, sealing lever axle, yoke, disconnection spring, lever arrester and auxiliary contact array with button, is additionally equipped with stop rod mounted on the lever arm shorter than lever arm carrying disconnection spring. The rod passes through a hole in lever and carries lever stop mounted on thread and fixated by nut lock at one rod end, the other rod end fixated against case. In addition, a metal lathe is attached to sealing lever at the lever stop side and has a hole coaxial to lever hole, for stop rod positioning, while lever stop rests against the metal lathe in disconnection state.

EFFECT: enhanced reliability and life time of contactor.

2 cl, 2 dwg

Description

The invention relates to low-voltage and high-voltage electrical apparatus and may find application in electrical circuits for remote control of electric drives and networks.

A technical solution is known in which the contactor contains vacuum interrupter chambers, an electromagnet, a housing, an insulating lever with an electromagnet armature, a disconnecting spring and a lever stop (for example, AS No. 1725281, class Н01Н 33/66, priority date 09.04.90 g ., as well as the patent of the Russian Federation No. 2040816, CL H01H 33/66, priority from 04/19/93). In a known technical solution, the breaking spring and the lever stop are connected in one node. The breaking spring is centered by a rod, one end of which is screwed into the yoke, and a lever stop is fixed at the other end.

A disadvantage of the known technical solutions is the reduction in the service life of the lever and its failure resulting from the placement of the lever stop at the end of the lever and the combination of the lever stop and the breaking spring. This arrangement is optimal for the breaking spring, since it can be dispensed with a weaker small spring, but not rational for the lever stop, since when placing the lever stop at the end of the lever, the latter is subjected to the greatest shock load. This is because the linear velocity of the movement of the end of the lever is greatest, and the momentum of the force upon impact is directly proportional to the square of the linear velocity.

The proposed technical solution increases the reliability and durability of the contactor. This is achieved by disconnecting the disconnecting spring and the lever stop and placing them in the most optimal places.

To do this, into the well-known vacuum contactor, which contains mainly three vacuum arcing chambers, an electromagnet, a housing, an insulating arm with an electromagnet armature, an axis of the insulating arm, a yoke disconnecting a spring, a lever travel limiter and an auxiliary contact block equipped with a button, an additional stop rod is introduced, which placed on the arm of the lever, smaller than the arm on which the disconnecting spring is located, in the arm there is an opening through which a rod is passed, at one end of which is mounted on the p the lever stop, which is fixed with a lock nut, the other end of the rod is fixed relative to the body; additionally introduced a metal bar, which is attached to the insulating lever on the side of the lever stop, and in which to accommodate the thrust rod there is a hole coaxial with the hole in the lever, the lever stop in the disconnected state of the contactor rests on the metal bar.

Figure 1 shows the contactor in the on position.

Figure 2 - contactor in the off position.

The vacuum contactor contains arcing chambers 1 located in the housing 2, the movable contacts of the chambers are connected to the rods 3 and, when the main circuit is switched on, are pressed by springs 4. An electromagnet 7 is mounted on the housing 2, the anchor of the electromagnet 8 is attached to the insulating arm 5, the metal strip 9 is rigidly attached to the isolation arm with 5 screws (not shown). The yoke 10 of the electromagnet 7 is attached to the housing. The breaking spring 11 is centered by a part 12 provided with a rod 13 and a part 14 with a hole in which the rod 13 enters. The part 12 with a conical socket on the end abuts against the spherical end face of the stop 15 screwed into the metal bar 9, and the spherical end of the part 14 abuts against the conical the socket on the yoke 10. The lever stop is located as close as possible to the axis of rotation 6 of the lever 5, but behind the insulating partition 16 of the housing 2 and consists of a rod 17 with a head 18 sandwiched between the protrusion of the insulating housing 2 and the yoke of the electromagnet 10, and a threaded stop 19 s to trgaykoy 20. The rod 17 passed with clearance through apertures in the lever 5 and 9 in the metal strip.

The contactor operates as follows.

To turn on the main circuit, an electromagnet 7 is turned on, attracting the armature 8. The insulating arm 5 connected to the armature rotates around axis 6, releasing the movable contacts of the main circuit of the arcing chamber 1. Under the influence of atmospheric pressure, the chamber contacts are closed and additionally pressed by the springs 4. When the electromagnet is disconnected, the breaking spring 11 rotates the insulating lever 5, the stroke of which is limited by the stop 19 of the lever. In this case, the insulating lever 5 acts on the rod 3 associated with the movable contact of the arcing chamber 1, and the contacts of the arcing chamber are opened. The stroke of the lever is regulated by rotation of the stop 19 and this position of the stop is fixed by the lock nut 20. The force of the breaking spring 11 is controlled by the rotation of the stop 15.

The introduction of an additional thrust rod and its placement on the lever arm smaller than the arm on which the disconnecting spring is located is necessary for disconnecting the disconnecting spring and the lever stop and placing them in the most optimal places. A metal strip is necessary to protect the insulating lever from destruction during impacts that occur when the contactor is disconnected, the lever stop is fastened to the thread to regulate the lever stroke, and hence the movable contacts of the vacuum chambers.

Claims (2)

1. A vacuum contactor comprising mainly three vacuum interrupter chambers, an electromagnet, a housing, an insulating arm with an electromagnet armature, an arm axis, a yoke disconnecting a spring, a lever travel limiter and an auxiliary contact block equipped with a button, characterized in that a thrust is additionally introduced into it the rod, which is placed on the arm of the lever, smaller than the arm on which the disconnecting spring is located, in the arm there is an opening through which the rod is passed, at one end of which is attached to the thread long lever which is fixed a lock nut, the other end of the rod is fixed relative to the housing. 2. The vacuum contactor according to claim 1, characterized in that a metal strip is additionally inserted into it, which is fastened to the insulating lever on the side of the lever stop, and in which there is a hole coaxial to the hole in the lever for placing the stop rod, the lever stop in the off state contactor rests on a metal bar.

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