RU2367049C1 - Vacuum contactor - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to LV and HV electrical hardware and can be used in remote control circuitry. Proposed contactor comprises, preferably, three vacuum arc-extinguishing chambers, electromagnet, casing, insulating lever with electromagnet armature, insulating lever axle, yoke, opening spring, lever stroke limiter and set of auxiliary contacts furnished with a push-button. In compliance with this invention, it is furnished with additional lever arranged on the housing to turn thereabout. Longer arm of additional lever interacts with insulating lever, while its shorter arm acts on auxiliary contact unit push-button. Ratio of auxiliary lever short arm-to-its long arm equals the ration of auxiliary contact set button-to-insulating lever stroke at the point of interaction with auxiliary lever. Auxiliary lever can have positive camber on the side of interaction with auxiliary contact set button.

EFFECT: higher reliability and longer life.

2 cl, 4 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 comprises three arc chambers, an electromagnet, a housing, an insulating arm with an electromagnet armature and an auxiliary contact block provided with a button.

(AS No. 1725281, class Н01Н 33/66, priority dated 04/09/90.) In this device, the lever directly affects the button of the auxiliary contact block.

A disadvantage of the known device is that when the contactor is turned on, the auxiliary contact block is subjected to loads arising from the high speed of the lever. These loads can become shock and increase sharply if, due to the small stroke of the button of the auxiliary contact block and shrinkage of its spring in the disconnected position of the contactor, a gap occurs between the button of the auxiliary contact block and the contactor lever. Button loads lead to premature wear of the contacts of the auxiliary contact block, reducing the service life of the auxiliary contact block and reducing the reliability and durability of the contactor.

The proposed technical solution increases the reliability and durability of the contactor, as well as the convenience of its maintenance. This is achieved by reducing the speed of the button of the auxiliary contact block and preventing the gap between the button of the auxiliary contact block and the contactor lever in the off position.

For this purpose, a well-known vacuum contactor containing mainly three vacuum interrupter chambers, an electromagnet, a housing, an insulating arm with an electromagnet armature, an axis of an insulating arm, a yoke that disconnects a spring, a lever travel limiter and an auxiliary contact block equipped with a button, an additional arm mounted on rotatable housing, the long shoulder of the additional lever interacts with the contactor lever, and the short shoulder with the button of the auxiliary contact block, and the ratio the short arm of the additional lever to its long shoulder is equal to the ratio of the button stroke of the auxiliary contact block to the stroke of the contactor lever at the point of interaction with the additional lever; the additional lever from the side of interaction with the button of the auxiliary contact block has a positive curvature.

Figure 1 shows the contactor in the on position, the disconnecting spring and the stop of the insulating lever are visible;

figure 2 is the same in the off position of the contactor;

figure 3 - shows a block of auxiliary contacts and an additional lever when the position of the contactor;

figure 4 - block auxiliary contacts and an additional lever with the off position of the contactor.

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 disconnecting spring 11 is centered by a part 12 provided with a rod 13 and a part 14 with an opening into which the rod 13 enters. 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 with to with nut 20. Rod 17 is passed with a gap through the holes in the lever 5 and in the metal strip 9. The auxiliary contacts block 21 with the button 22 and the additional lever 23 on the axis 24 are also installed on the body.

To turn on the main circuit, an electromagnet 7 is turned on, attracting the armature 8. The insulating lever 5 connected to the armature rotates around axis 6, releasing the movable contacts of the main circuit of the interrupter 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 turns the insulating lever 5, the stroke of which is limited by the emphasis of the lever 19. In this case, the insulating lever 5 acts on the rod 3 associated with the movable contact of the arc chamber 1, and the contacts of the arcing chamber open. The lever stroke is controlled by rotation of the stop 19 and this stop position is fixed by the lock nut 20. The force of the breaking spring 11 is controlled by the rotation of the stop 15. Turning, the lever 5 acts on the long shoulder of the additional lever 23, which in turn acts on the button 22 of the auxiliary contact block 21 for switching contacts in the control circuit of the contactor, as well as in the control circuit of the electric drive.

In this case, the working stroke of the lever of the contactor 5 at the point of interaction with the additional lever 23 is equal to the working stroke of the long arm of the additional lever, and the working stroke of the additional lever at the point of contact with the button is equal to the working stroke of the button of the auxiliary contact unit. Thus, the contact of the lever of the contactor 5 with the additional lever 23 and the latter with the button 22 of the auxiliary contact block 21 is not interrupted during switching the contactor on and off, which prevents the occurrence of shock loads. In addition, the introduction of an additional lever reduces the linear speed of the button of the auxiliary contact block in proportion to the shoulders of the additional lever, which also favorably affects the durability of the auxiliary contact block and, as a consequence, the durability of the contactor.

The introduction of an additional lever is necessary to reduce the speed of movement of the button of the auxiliary contact block, the positive curvature of the additional lever provides an emphasis on the button of the auxiliary contact block in a surface perpendicular to the axis of the button, which protects the latter from bending loads. All this improves the reliability and durability of the contactor.

Claims (2)

1. A vacuum contactor comprising mainly three vacuum interrupter chambers, an electromagnet, a housing, an insulating lever with an electromagnet armature, a lever axis, a yoke disconnecting a spring, a lever travel limiter and an auxiliary contact block equipped with a button, characterized in that an additional lever is inserted into it mounted on the housing with the possibility of rotation, the long shoulder of the additional lever interacts with the lever of the contactor, and the short shoulder with the button of the auxiliary contact block, and the ratio one additional lever arm to its long arm equal to the ratio turn button unit to the auxiliary contacts of the contactor working stroke of the lever at the point of interaction with an additional lever. 2. The vacuum contactor according to claim 1, characterized in that the additional lever on the side of interaction with the button of the auxiliary contact unit has a positive curvature.

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