SU907613A1 - Change-over switch - Google Patents

Description

(54) SWITCH

one

The invention relates to electrical engineering, namely to switching devices.

Known switches containing a dielectric body, a drive mechanism and contact groups, including side fixed contact plates, a central support lead and a flip contact plate mounted on the support lead and interacting with their ends with the ends of the fixed contacts 1 and 2.

A disadvantage of the known switches is their insignificant service life, namely the low efficiency of the work of the plane-plane contact pairs in the arcing modes, when the ends of the flip contact plates and the ends of the side contacts are subjected to intensive erosive wear. In this case, the electric arc burning products are layered over the entire contact zone with each switching cycle, causing a sharp increase in the resistance of the electrical contact and failure of the switch during operation.

The problem of increasing the service life is most successfully solved in a switch in which the stability of the contact pressure of each individual pair is ensured 2.

However, this solution is private and does not exclude the use of special wear-resistant contact alloys based on precious metals.

The purpose of the invention is to increase the service life.

Claims (2)

The goal is achieved by a switch comprising a dielectric body, a drive mechanism and contact groups including side fixed contact plates, a central supporting contact terminal and a flip contact plate mounted on the supporting contact output with the possibility of their ends interacting with the ends of the fixed contacts, the ends of the flip contact plate and the ends of the fixed contacts of the plates are made with relief areas for selective interaction between themselves Each relief portion comprises at least two pairs of contact pads, each of the contact pads of one pair is formed adjacent to the pad of the other pair. Moreover, in order to reduce the consumption of precious metals, flip and fixed contacts are made of bimetal. Contact pads can be, for example, inclined and horizontal. The interaction of the inclined pads occurs with some stripping when the contact pairs are closed, which increases reliability and increases the service life of the contacts. Horizontal pads are spare and begin to function as sloped pads wear out. FIG. 1 shows a switch, a general view; in fig. 2 - changeover contact; in fig. 3 - fixed contact; in fig. 4-11 - reliefs of contact areas, the most acceptable for making flip and fixed contacts. The switch consists of contact groups that include fixed side contacts 1, 2, a central support pin 3 and a changeover contact 4, a dielectric body 5 and a drive mechanism that includes a shoe 6, a pusher 7, a spring lever 9, an axis 10, a sleeve 11 and a cover 12 Fixed contacts 1, 2 can be made, for example, with inclined pads 13, and movable - with inclined pads 14 and respectively with horizontal sections 15 and 16. The switch operates as follows. In the static state, lever 9 occupies the right extreme position. When this block 6 under the influence of springs 8 is tucked to the lid 12, the pusher 7 - to change-over contacts 4, and the ends of change-over contacts 4 - to the ends of the fixed contacts 1, while the inclined areas 14 of the movable contacts 4 interact with the inclined areas 13 of the fixed contacts 1. The fixed contacts 2 remain normally open. When an external force is applied, the lever 9, turning on the axis 10, moves the block 6 with the spring-loaded pushers 7 in the opposite direction. When passing through the central support output, the three springs are under maximum compression and provide instant transfer of changeover contacts 4, closure of fixed contacts 2. In this case, for each switching cycle, cleaning of inclined platforms 13 and 14 occurs, and horizontal platforms 15 of fixed contacts 1,2 and platforms 16 changeover contacts 4 do not interact. As the inclined pads 13 and 14 are worn out, the horizontal pads 15 and 16, gradually getting closer, begin to function, and depending on the wear pattern of the electrical contacts, selective (selective) interaction of the contacting pads is possible. Each of the contacting areas is separated from each other and interacts as a separate contact surface. The relief of the contact areas allows the possibility of making several optimal variants of fixed and throw-over contacts (Fig. 2-10). The efficiency of the relief contact areas is achieved with selective contacting without the use of expensive wear-resistant contact alloys. The fixed and change-over contacts are made of bimetal based on bentane colored materials. Claim 1. A switch comprising a dielectric body, a drive mechanism and a contact. groups, including side fixed contact plates, a central support contact terminal and a flip contact plate mounted on the support contact output with the ability to interact with their ends with fixed contact ends, characterized in that, to increase the service life, the ends of the flip contact the plates and the ends of the fixed contact plates are made with relief areas for selective interaction with each other, each relief area includes at least two pairs of co stroke irichem pads each of one pair of contact pads formed adjacent to the pad of the other pair. 2. The switch according to claim 1, characterized in that, in order to reduce the consumption of precious metals, the flip and fixed contacts are made of bimetal. Sources of information taken into account in the examination 1. US patent number 4117284, cl. 200-67, 1978. 2. USSR author's certificate for application number 2905897/07, cl. H01 and 23/02, 1980. FIG. 2 13 / J if 12 C II FIG. ten / 11