SU1265883A1

SU1265883A1 - Automatic switch

Info

Publication number: SU1265883A1
Application number: SU853903372A
Authority: SU
Inventors: Владислав Яковлевич Гущин; Николай Макарович Кузнецов
Priority date: 1985-05-29
Filing date: 1985-05-29
Publication date: 1986-10-23

Abstract

Изобретение относитс к электротехнике , в частности к автоматическим вьжлючател м низковольтных электрических аппаратов. Целью изобретени вл етс повышение надежности при отключении токов короткого замыкани . Автоматический выключатель (АВ) содержит механизм свободного расцеплени , состо щий из расцепл ющего рычага (РР) 1, закрепленного на оси 2 с возможностью вращени , и отключающей рейки 7, с которой входит в зацепление РР, неподвижньй контакт 10, подвижный контакт 8, шарнирно соединенный с РР 1 с возможностью вращени вокруг этого шарнира 9, пружину 11, руко тку управлени 5, дугогасительную камеру 16, максимальный расцепиго тель тока 15 и дополнительную пружину 12, котора установлена между не (Л подвижной частью АВ и РР с возможноThis invention relates to electrical engineering, in particular, to automatic switches for low-voltage electrical apparatus. The aim of the invention is to increase reliability when short-circuit currents are disconnected. The circuit breaker (AB) contains a free trip mechanism consisting of a release lever (PP) 1 fixed on the axis 2 rotatably and a disconnecting rail 7 with which the PP engages, fixed contact 10, movable contact 8, hinged connected to the PP 1 rotatably around this hinge 9, the spring 11, the control handle 5, the arcing chamber 16, the maximum current release 15 and the additional spring 12, which is installed between not (L mobile part AB and PP with possible

Description

стью воздействи на PP. При отключении токов короткого замыкани АВ обеспечивает повьшение надежности в работе благодар дополнительной пружине 12. Усилие ее приложено к РР 1, создает момент относительно оси 2 его вращени ,направленный в сторонуimpact on PP. When the short-circuit currents of the AB are disconnected, the reliability in operation is due to the additional spring 12. Its force is applied to the PP 1, it creates a moment relative to the axis 2 of its rotation, directed towards

расцеплени РР с отключающей рейкой .7 и действующий на прот жении всего угла поворота РР независимо от величины сцеплени приварившихс контактов , и резко увеличивает отрывающее усилие подвижного контакта 8 от неподвижного контакта 10. 3-ил.disconnecting PP with disconnecting rail .7 and acting for the entire angle of rotation PP regardless of the amount of adhesion of the welded contacts, and sharply increases the tearing force of the movable contact 8 from the fixed contact 10. 3-yl.

Изобретение относитс к электротехнике , в частности к автоматическим выключател м низковольтных электрических аппаратов.This invention relates to electrical engineering, in particular to automatic switches of low-voltage electrical apparatus.

Цель изобретени - повьшение надежности при отключении токов короткого замыкани .The purpose of the invention is to increase reliability when short-circuit currents are disconnected.

На фиг.1 представлена кинематическа схема автоматического выключател в положении Включено ; на фиг.2 jTo же, в положении Отключено автома тически ; на фиг. 3 - то же, в поло;жении Отключено вручную или Взведено .Figure 1 shows the kinematic circuit of the circuit breaker in the On position; 2, the jTo is also in the Disabled position automatically; in fig. 3 - the same, in the position; Disabled manually or Cocked.

Автоматический выключатель содержит расцепл ющийс рычаг 1, закрепленный с возможностью вращени на оси 2, установленную на шарнире 3 скобу 4, на которой установлена руко тка 5 управлени . Скоба 4 имеет отгиб 6, который может.поворачивать расцепл ющийс рычаг 1 только по часовой стрелке вокруг оси 2 при движении руко тки 5 управлени ,в сторону отключающей рейки 7. Подвижный контакт 8 вращаетс в шарнире 9, которым он соединен с расцепл ющимс рычагом 1. Контактное нажатие между подвижным контактом 8 и неподвижным контактом 10 создаетс пружиной 11 раст жени , котора зацеплена од- ним концом за ПОДВИЖНЕЙ контакт 8, а другим - за скобу 4.The circuit breaker contains a disengaging lever 1 mounted for rotation on an axis 2, mounted on a hinge 3 a bracket 4 on which a control handle 5 is mounted. Bracket 4 has a bend 6 that can turn the disengaging lever 1 only clockwise around axis 2 when the control handle 5 moves in the direction of the disconnecting rail 7. The movable contact 8 rotates in the hinge 9, which connects it to the disengaging lever 1 The contact pressure between the moving contact 8 and the fixed contact 10 is created by a tension spring 11, which is hooked by one end to the MOVING contact 8, and the other end to the clip 4.

Пружина 12 раст жени , зацепленна одним концом за расцепл ющийс рычаг 1 на участке межцу осью 2 и шарниром 9, а другим - за неподвижную часть автоматического выключател , обеспечивает расцепл ющемус рычагу 1 вращающий момент, направленный против часовой стрелки, т.е. в сторону расцеплени расцепл ющегос рычага 1 с отключающей рейкой 7.. The tension spring 12, which is hooked at one end to the disengaging lever 1 in the area between the axis 2 and the hinge 9, and the other to the fixed part of the circuit breaker, provides the disengaging lever 1 with a counter-clockwise torque, i.e. in the direction of disengagement of the disengaging lever 1 with the disconnecting rail 7 ..

других вариантах пружина 12 раст жени может быть зацеплена за расцепл ющийс рычаг1 на участке между шарниром 9 и концом расцепл ющегос рычага 1, которым он входит в зацепление с отключающей рейкой 7. Могут быть также применены пружины сжати кручени и другие упругие элементы. Однако все они должны создавать вращающий момент, приложенный к расцепл ющемус рычагу в направлении его расцеплени с отключающей рейкой 7.In other embodiments, the tension spring 12 may be engaged with the release lever 1 in the region between the hinge 9 and the end of the release lever 1 with which it engages with the release rail 7. Torsion springs and other elastic elements may also be used. However, they must all create a torque applied to the release lever in the direction of its disengagement from the release rail 7.

Разомкнутое положение контактов фиксируетс при касании подвижного контакта 8 с упором 13.The open position of the contacts is fixed when the movable contact 8 is touched with the stop 13.

Положение расцепл ющего рычага 1 после расцеплени его с отключающей рейкой 7 фиксируетс упором 14.The position of the release lever 1 after it has been disengaged from the release rail 7 is fixed by the abutment 14.

Дл обеспечени срабатывани механизма свободного расцеплени при токах короткого замыкани автоматический выключатель снабжен максимальным расцепителем 15 тока, а дл гашени электрической дуги, возникающей при отключении тока короткого замыкани - дугогасительной камерой 16.In order to ensure the operation of the free trip mechanism at short-circuit currents, the circuit breaker is equipped with a maximum current release 15, and for extinguishing the electric arc arising when the short circuit current is turned off, the arc chute 16.

Автоматический выключатель работает следующим образом.The circuit breaker operates as follows.

При движении руко тки 5 управлени в сторону отключающей рейки 7 скоба 4 отгибом 6 поворачивает расцепл ющийс рычаг 1 вокруг оси 2, ввод его в зацепление с отключающей рейкой 7. При этом вместе с расцепл ющимс рычагом 1 перемещаетс соединенный с ним шарниром 9 подвижный контакт 8, который все это врем разомкнут и поджат пружиной 11 раст жени к упору 13. When the control handle 5 moves in the direction of the disconnecting rail 7, the bracket 4 bends 6 rotates the disengaged lever 1 around axis 2, and engages it with the disconnecting rail 7. At the same time, movable contact 8 connected with it by hinge 9 moves together with the disengaging lever 1 All this time it is open and pressed by the tension spring 11 against the stop 13.

Claims

The force P created by the tension spring 11 is expanded on the force P ,, directed along the movable contact 8, and the force P pressing the movable contact 8 to the stop 13. The automatic switch is turned on as follows. The control knob 5 moves with the clip 4 around the hinge 3 towards the fixed contact 10, moving the end of the extension spring 11, which is hooked by the clip 4. When the upper point of the tension of the tension spring 11 approaches the hinge 9, the force Pj generated by the tension spring 11 decreases and the force P increases. When the spring 11 stretches through the hinge 9, when the longitudinal axis of the tension spring 11 coincides with the longitudinal axis of the movable contact 8, the force Pj decreases to zero and the force P becomes equal to P and directed along the longitudinal axis of the movable contact 8. Upon further movement of the control knob 5 and moving the upper point of engagement of the spring 11 stretching the hinge 9, the force P appears, directed towards the closing side of the movable contact 8 with the fixed contact 10. Under the action of the force P, the movable contact 8 rotates g of the hinge 9, which is currently fixed, since the release to the lever lever 1 is engaged with the disconnecting rail 7 until it touches the fixed contact 10. The contacts are closed. The circuit breaker is on. When flowing through an automatic circuit breaker that exceeds the setpoint, the maximum current release 15 is activated and turns the disconnecting rail 7, disengaging the release lever 1, which, due to the forces generated by the springs 11 and 12, rotates around the axis 2 counterclockwise, moving the hinge 9 to the left, whereby the movable contact 8, remaining closed with the fixed contact 10, approaches the expansion spring 11. When the hinge 9 moves beyond the longitudinal axis of the tension spring 11 and is to its left, the movable contact 8 with the fixed contact 10 will open under the action of the force P, which changes its direction towards the opening. 34 When the automatic short-circuit breaker trips, contact welding is possible. Most often this happens when the circuit-breaker is switched on a short-circuited circuit due to the rebound of the movable contact 8 from the fixed 10 after their impact. If the cohesive forces at the place of welding of the contacts are significant, then from the stretching spring 11 to the disengaging lever 1, at best, a slight force will be transmitted through the movable contact 8 only due to the component P. At the same time, the magnitude of the force of the spring 12 for stretching Γ acting directly on the disengaging pn 1 does not depend on whether the contacts are made or not. After uncoupling with the disconnecting rail 7, the disengaging lever 1 is rotated by the force of the tension spring 12, moving the movable contact 8, which, acting as a lever of the first kind, destroys it. Upon further movement of the disengaging lever 1, the contacts dissolve in a manner similar to that considered. Thus, in comparison with the known device, the proposed circuit breaker provides increased reliability when the short-circuit currents are disconnected, since the use of an additional spring, the force of which is applied directly to the unlocking lever, and creates a moment relative to the axis of its rotation, in the direction of uncoupling with disconnecting rail and operating over the entire angle of rotation of the lever regardless of the strength of the grip of the welded contacts , dramatically increases the tearing force of the movable contact from the stationary. The formula of the Isobre and the Circuit Breaker, which contains an insulating housing, a free trip mechanism, consisting of a tripping lever fixed on an axis so that it can be rotated, and a tripping bar, from which the tripping lever can engage a fixed contact , mobile ontact, pivotally connected with the disengaging lever with the possibility of rotation around this hinge, spring, creating contact pressure, control knob, connected with the help of said spring with moving contact, ogasitelnuyu chamber and maximum release current, characterized in that, in order to increase reliability when switched off short circuit currents SRI it. 12 83, 4 is provided with an additional spring installed between the fixed part of the circuit-breaker and the disengaging lever with the possibility of its action on the disengaging lever, while the moment it generates relative to the axis of rotation of the disengaging lever is directed toward the disengaging rail.