SU987708A1 - Electromagnetic relay - Google Patents

Abstract

The apparatus is designed to ensure significant reduction of bounce both during the attraction and the release of the armature. There is a contact leaf spring (1) which is clamped at one end at (6). The small size of the relay makes it expedient to place the actuator (7) outside the contact area of the leaf spring. Contact bounce is limited with a cutout at the free end of the spring in order to match the spring rate to the force-stroke characteristic of the relay electromagnet. The method is suitable for relays with relatively large strokes and low pull force.

Description

(54) ELECTUMAGNIGNAL RELAY

The invention relates to the electrical industry and can be used in switching devices.

An electromagnetic relay is known, which contains fixed and movable contacts, 5 located on flat springs, cantilever-mounted on the base, and an actuating element connected to the electromagnet core and to a free end of the flat spring 1 that protrudes beyond the point of location of the moving contacts.

The lack of a relay is the bounce of its contacts.

The purpose of the invention is to reduce the chatter of the relay contacts.

The goal is achieved by the fact that in 15 relays, containing fixed and movable contacts located on flat springs, cantilever-mounted on the base, and an actuating element, connected with the electromagnet core and free, protruding beyond the point of the moving condoms springs, at the free end of the flat spring of movable contacts, cuts are made symmetrically with the axis of the spring.25

FIG. 1 shows an electromagnetic relay; in fig. 2 - load and magnetic characteristics of the relay; in fig. 3 and 4 are embodiments of the contact spring, view.

The electromagnetic relay contains a flat spring with movable contact 2 and fixed contacts 3 and 4 located on it. Spring 1 is cantilever-mounted on base 5. An element 7 connected to a bore is attached to the free end of the flat spring protruding from the point of moving contacts 2. electromagnet (not shown). Symmetrically to the axis of the spring 1, notches 8 or 9 are made at its free end 6.

Claims (2)

When determining the dimensions of the contact spring, its load characteristic must be matched with the magnetic characteristic in such a way that a sufficiently secure for reliable protection is guaranteed. There is an excess of magnetic force and a slight difference in strength between the magnetic characteristic and the load, the characteristic at the moment of attraction of the core for a reduced 398 bounce. At the same time, for reliable operation of the relay, the load characteristic of the contact spring should not pass above the magnetic characteristic. The load characteristic of the contact spring consists of three sections. Plot a is the stroke of the force-distance characteristic up to the opening of the movable contact 2 and the fixed contact 4. Plot is the stroke of the characteristic strength up to the contact of the movable contact 2 and the fixed contact 3. Plot c is the stroke of the characteristic force-distance up to closing and establishing the working contact force between the moving contact 2 and the fixed contact 3. The matching is carried out by changing the steepness of the contact force from rest to the working state of areas a and c at oschi cutouts 8 or 9 in the area of the free end. 6 of the flat spring 1. The slope of the region in remains unchanged, however, the length of this region increases. The shape of the cut-outs 8 and 9 is chosen arbitrarily, however, the cross-section of the spring 1 cannot be reduced so that the elasticity limit is exceeded as a result of the actuation of the actuator 7 or the section has such elasticity that the actuation force of the core does not fully pass through the performance element on contacts. The reduction in the cross-section of the cut aid helps to ensure that the free end 6 of the flat spring 1 has increased mobility and flexibility in comparison with the area of the spring 1 with the same constant spring between the base 5 and the contact 2. Bounce caused by; by actuation of the core, the actuating element 7 is transmitted to the spring 1, however, as a result of the increased flexibility and elasticity of the free end 6, the spring 1 is transmitted to contact points that are significantly weakened. Making cuts on the plate reduces the contact bounce of the proposed relay both when the core is attracted and when it is released. Claims of Electromagnetic Relay, containing fixed and movable contacts located on the floor} 5c springs, console mounted on the base, and an actuator associated with the electromagnet core and with a free end of the flat spring protruding beyond the point of moving contacts, characterized in that In order to reduce the chattering of the relay contacts, at the free end of the flat spring of the moving contacts there are cutouts symmetrically with the spring axis. Sources of information taken into account during the examination 1. Patent of Germany No. 2126214, cl. H 01 H 50/00, 1971 (prototype). 7 /// 0l / f. /