RU2322723C1 - On/off and disconnecting switch - Google Patents

Abstract

FIELD: low-voltage switching apparatuses; on-load and no-load connection and disconnection of electric circuits.

SUBSTANCE: proposed ON/OFF and disconnecting switch has case with fixed contacts installed in its recess, slider with movable contacts, cover attached to case, arc-control chamber, and ON/OFF mechanism incorporating grip, shaft, hub rigidly fixed to shaft and installed in clamp which is attached on side of switch case. Hub-carrying shaft is coupled on one end with grip and on other end, with lever disposed on rear side of case in its recess and coupled through link with slider pin end. Recess mounts extension spring attached on one end to slider pin end and on other end, to clamp.

EFFECT: reduced number of parts and material input, provision for instant disconnection and simultaneous switching of circuit in poles.

1 cl, 3 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of electrical engineering, namely to low-voltage switching devices, in particular to switch-disconnectors, and can be used in many industries and agriculture to turn on and off electric circuits under current load and without it.

State of the art

Known switch-disconnector containing an insulating casing, in the upper part of which a transparent cover is made, a zero conductor, a set of fixed knife contacts with corresponding arcing chambers, a set of movable contacts installed in the corresponding slots of the supporting slider, and a control mechanically coupled to a supporting slider by means of an instantaneous action mechanism configured to provide movement n lzuna, wherein each of said plurality of movable contacts is designed as a four copper clips, and spring-loaded leaf springs formed in unit with said rollers rotatable independently of each other and ensuring a predetermined contact pressure during switching.

In the switch-disconnector, four copper rollers, spring-loaded with leaf springs, are formed into a block by means of a T-shaped metal plate passing through the corresponding coaxial holes of two metal brackets, a metal plate, and also a locking metal plate, which is fixed in the corresponding groove of the T-shaped metal plate .

In the switch-disconnector, the instantaneous mechanism is made in the form of two compression springs, two brackets and a pin and provides the connection of the control body with the indicated movable contacts.

In the switch-disconnector, the control is made in the form of a handle with a telescopic shaft.

In the switch-disconnector, the set of fixed knife contacts contains six fixed knife contacts, the set of movable contacts contains three movable contacts, with each fixed knife contact corresponds to one arcing chamber.

In the switch-disconnector, the transparent cover in the upper part of the housing is made with the possibility of ensuring the visibility of double contact breaking during switching (see US Pat. RF No. 2257634, class H01H 21/02, published on July 27, 2005).

The disadvantages of this switch are low reliability and switching ability.

A load switch is known comprising a housing in which fixed contacts with external clamps, movable rotary contacts, arc chambers, a switching mechanism and a locking mechanism are placed (see "ELEKTROSCHALT GERATE GRIMMA", GDR, 1971).

The disadvantage of this load switch is a complex movable contact system, which consists of contact plates with springs (movable contacts) that are separately pivotally mounted in the recesses of the housing, while the torque from the handle to the movable contacts is transmitted by two parallel drive strips that are connected to the traverse of the individual poles ( contacts).

The closest in technical essence and the achieved positive effect and accepted by the authors for the prototype is a switch-disconnector containing a housing with a lid and fixed contacts installed in the recesses of the housing, and a slider with movable contacts and arcing chambers are installed in the windows of the transverse partitions of the housing forming the switching chambers , on-off mechanism (see. Low-voltage distribution and control equipment. Part 3. Switches, disconnectors, switch-disconnectors and co bination with their fuses. GOST 50030.3-99 (IEC 60947-3-99)).

The disadvantage of this switch is the design complexity, low reliability.

Disclosure of invention

The objective of the invention is to develop a switch-disconnector having a reduced number of parts and material consumption, the possibility of instantaneous disconnection and simultaneous switching of the circuit in the poles.

The technical result that can be obtained using the present invention is to reduce the number of parts and the consumption of materials, the possibility of instantaneous disconnection and simultaneous switching of the circuit at the poles.

The technical result is achieved by means of a switch-disconnector comprising a housing with a lid and fixed contacts installed in the recesses of the housing, and a slide with moving contacts, arcing chambers, an on-off mechanism, is installed in the windows of the transverse partitions of the housing forming the switching chambers, the latter being made of handles, shaft, hub, rigidly connected to the shaft and mounted in a bracket, which is fixed to the side of the housing, and the shaft with the hub at one end is connected to the handle, and the other end with a lever, which is located on the rear side of the housing, in its recess and connected via a rod to the end of the slider pin, while a tension spring is installed in the recess, which is fixed at one end of the slider pin with the other end and is fixed to the bracket.

Brief Description of the Drawings

Figure 1 shows the switch-disconnector without a cover, a General view.

Figure 2 is the same, a section along the longitudinal axis of the switch.

Figure 3 is the same, rear view.

The implementation of the invention

The switch-disconnector (hereinafter referred to as the "Switch") consists of:

- the housing 1 with fixed contacts 2 installed in special recesses of the housing 1 and fixed therein with screws 3;

- slider 4 with movable contacts 5;

- cover 6, fixed to the housing 1 using screws 7;

- interrupter chambers 8;

- an on-off mechanism (not indicated), wherein the slider 4 is installed in the windows 9 of the transverse partitions 10 of the housing 1 with the possibility of moving in the housing 1 together with the movable contacts 5, while the movable contacts 5 are installed in the rectangular windows 11 of the slider 4 and fixed in them together with contact springs 12 using pins 13, contact springs 12 provide contact pressing when connecting the movable contacts 5 to the fixed contacts 2 when the switch is on.

The slider 4 has a guide pin 14, which is rigidly fixed at one end, and is inserted into the groove 15 of the housing 1 at the other end and can be moved together with the slider 4 from one extreme position “disconnected” to another extreme position “turned on”.

The on-off mechanism of the switch consists of a handle 16, a shaft 17, a hub 18, rigidly connected to the shaft and installed in the bracket 19, which is attached to the side of the switch housing 1. A shaft 17 with a hub 18 is connected at one end to a handle 16 and at the other end to a lever 20, which is located on the rear side of the housing 1 in its recess 21 and is connected via a rod 22 to the end of the pin 14 of the slider 4. A tension spring 23 is installed in the recess 21 , which at one end is fixed to the end of the pin 14 of the slider 4, and the other is fixed to the bracket 19.

The recess 21 has dimensions that allow the lever 20 to be rotated through an angle corresponding to the on or off position.

By turning the handle 16, the operator, turning on or off the switch, controls the movement of the slider 4, moving it to the “on” position or the “off” position. In this case, the contacts 2 are closed or opened. The spring 23 provides instantaneous disconnection of the contacts 5 during operation of the switch, and the cover 6, fixed to the housing 1, is provided with protrusions 24.

The operation (switching) of the switch-disconnector is as follows:

- When turning the handle 16 from the “off” position to the “on” position (presumably clockwise), the rotation of the shaft 17 with the hub 18 is transmitted to the lever 20 and the thrust 22, which moves the slide 4 to the left through the pin 14 to the stop by the amount corresponding to the rotation of the handle 16 to the on position. In this case, the movable contacts 5 close the fixed contacts 2, connecting the electrical circuits of all contacts at the same time. The tension spring 23 is stretched, and energy is accumulated by the on-off mechanism of the switch.

- When turning the handle 16 from the "on" position to the "off" position (presumably counterclockwise), the slider 4 moves in the opposite direction to the right until it stops by the amount corresponding to the turn of the handle 16 to the "off" position. In this case, the movable contacts 5 open the fixed contacts 2 and stop at a certain distance, providing for arcing together with the arcing chambers 8 and disconnecting the electrical circuits of all contacts at the same time.

In this case, the spring 23 changes the direction of the force, and there is a release of energy by the on-off mechanism of the switch.

The locking of the movable contacts 5 in the extreme positions “off” or “on” is carried out when the “dead” position of the lever 20 and the link 22 are moved (when passing through the axis connecting the centers of rotation of the lever 20 and the link 22).

When passing through this axis to the “off” position, the direction of the spring force 23 and the release of energy by the on-off mechanism change, which ensures the instantaneous disconnection of the movable contacts 5 and the arcing together with the arcing chambers 8, which are installed in the sockets of the housing 1 and are prevented from falling out by the protrusions 24 covers 6.

The invention in comparison with the prototype and other known technical solutions has the following advantages:

- reduced number of parts and material consumption;

- the ability to instantly turn off the moving contacts (regardless of the operator’s action) of the switch;

- improvement of the conditions of extinguishing;

- simultaneous circuit switching at the poles.

Claims (1)

A switch-disconnector comprising a housing with a lid and fixed contacts installed in the recesses of the housing, and a slider with movable contacts, arcing chambers, an on-off mechanism, wherein the on-off mechanism is made in the windows of the transverse partitions of the housing forming the switching chambers of the handle, shaft, hub, rigidly connected to the shaft and mounted in a bracket that is fixed to the side of the housing, while the shaft with the hub is connected at one end to the handle and the other to tsom - with a lever, which is located on the rear side of the housing in its recess and is connected via a rod to the end of the slider pin, and a tension spring is installed in the recess, which is fixed at one end of the slider pin and the other fixed to the bracket.

Images