SU1737540A1 - Three-pole off-switch - Google Patents

Abstract

The invention relates to three-pole switches with voltages up to 1000 V. Essence: the poles of the switch are located on the hollow insulating casing symmetrically, at an angle of 120 & relative to each other, the moving contact control mechanism is positioned inside the housing. The coil of the electromagnet 15 is energized. 4. 1 z.p files, 2 ill.

Description

The invention relates to electrical engineering and can be used in switching devices for voltages up to 1000 V.

Known switches, including automatic ones, contain fixed and movable contacts in each pole, an arcing chamber mounted on an insulating material casing, an actuator whose movable element is connected to a movable contact of each pole by means of a transmission mechanism. The poles of the known switches are located either in one plane, one after the other, or in different planes, one above the other (packet switches).

The disadvantage of these switches is an increase in additional power losses at the poles, due to the effect of inductive power transfer.

The aim of the invention is to increase reliability and economy by reducing power losses at the poles and reducing the size of the switch.

This is achieved by the fact that the casing is made hollow, inside the casing there are fixed and fixed contacts of each pole at an angle of 120 ° relative to each other, the transmission mechanism is designed as a guide rod fixed in the center of the casing, on which is located a movable isolation coupling rigidly connected with the movable element of the actuator and pivotally connected with the movable contacts of all poles, the actuator being located inside the housing under the movable contacts.

The novelty and significant difference of the invention is the presence of a hollow insulating body with fixed contacts attached to it, a guide rod with a spring-loaded coupling fixed inside the case, which is pivotally connected to the moving contacts and rigidly connected to the cortex of the electromagnetic drive.

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FIG. 1 shows the proposed three-pole circuit breaker in a section along two poles; in fig. 2 shows section A-A in FIG. one,

The switch contains a cylindrical or multifaceted hollow insulating body 1, on which the pins 2 fixed contacts and pins 3 movable contacts are fixed. The fixed contact 4 is connected to the terminal 2. The movable contact 5 is placed on the contact holder 6, which has the ability to rotate on the axis 7, and is connected by a flexible coupling 8 to the terminal 3.

Pins 2 and 3 of fixed and moving contacts can be placed inside or outside the case or have a combination of placement. In the opening zone of the fixed 4 and movable 5 contacts, arcing chambers 9 are installed. The housing 1 is closed by two covers 10 and 11. A guide rod 12 is fixed on the cover 10, on which a movable insulating sleeve 13 is located, rigidly connected to a moving element of the drive, for example with a crust of 14 electromagnet. The coil 15 of the electromagnet is located inside the housing under the movable contacts and fixed to the housing.

The movable insulating clutch 13 is pivotally connected to the movable contacts 5 of all poles by a hard 16 and is spring-loaded by a return spring 17. The switch poles located inside the housing 1 symmetrically at 120 ° relative to each other are separated by partitions 18. installation it is equipped with two brackets 19.

The switch works as follows.

To turn on the switch, the coil 15 of the electromagnet is energized, the measles 14 of the electromagnet is drawn into the coil 15, while the movable clutch 13 moves up and with the help of t g 16 causes the movable contacts 5 together with the contact holders 6 to turn on the axis 7 to close with fixed contacts 4.

EJ of the closed state of the contacts, the current at each pole flows from pins 2 to pins 3 through fixed contacts 4,

movable contacts 5 and flexible connections 8. To keep the contacts in a closed state, the coil 15 of the electromagnet is under voltage or the measuring pin 14 of the electromagnet is mounted on a latch (not shown). ,

To turn off the switch, you must turn off the coil 15 of the electromagnet or release the latch holding

measles 14. Anchor under its own weight and under the action of spring 17 will return to its original position. T ha 16, moved together with the movable clutch 13, will move the movable contacts 5 to the disabled

position. An electric arc arising from the opening of contacts 4 and 50 is extinguished in the arc chamber 9.

The proposed switch has a simple design that allows

reduce size, reduces power loss at the poles, increases the reliability and efficiency of operation.

Claims (2)

1. Three-pole circuit breaker with fixed and movable contacts mounted on an insulating material casing, an arc-suppressing chamber, an actuator whose movable element is connected to a movable contact of each pole by means of a transmission mechanism, characterized in that, in order to increase reliability and efficiency by reducing power losses at the poles and downsizing, the switch body is made hollow, inside the case there are fixed and fixed contacts of each pole at an angle of 120 ° relative to each other, the transmission mechanism is designed as rod mounted in the center of the housing, on which a movable insulating coupling with a return spring is located, which is rigidly connected to the movable element of the actuator and is hingedly connected with movable contacts of all poles, and the drive is located inside the housing under the movable contacts. 2. The switch according to claim 1, characterized in that the drive is used An electromagnet whose moving element is the bark located inside the coil. nineteen 18 0 Figure 2.