SU858134A1 - Vacuum switch - Google Patents

Description

(54) VACUUM SWITCH

I

The invention relates to vacuum switching devices, namely, / to vacuum switches with induction-dynamic drive.

Vacuum circuit breakers are known that contain a vacuum arcing chamber, a rod connected at one end with a moving contact, and the other with a snap lock, and an inductively-dynamic type drive in the form of a coil and connected to a stem of a nonmagnetic material p 3

The drawbacks of such switches are the presence of a traction insulator, which must withstand a high mechanical load, a long and heavy rod and a massive disc, which make the design more comfortable and reduce the reliability of the switch.

Known vacuum circuit breakers,

which contain a vacuum arc chamber with a moetic con. tact driven by the shaft

and containing alternately energized coils that repel the respective conductive elements (disks), moving the shaft between two stable positions. In the on position, the movable contact and the shaft are held by the field of the permanent magnet 2 J.

In such switches, there is no stock and traction insulator, but they are

10 no less have a very complex structure, large size and weight.

The closest to the technical essence is a vacuum switch J containing a vacuum arc tube that is a two-hour chamber and an induction-dynamic drive with two single-layer slits 1 and. coils and placed between them a metal movable element, mounted on a movable

Claims (3)

10 contact of the vacuum arc chamber, one of the coils mounted on the part with the contact terminal 3. However, this switch has large dimensions and weight. The purpose of the invention is to reduce the size and weight of the switch. The goal is achieved by the fact that the switch is equipped with a magnetic conductor, rigidly connected with a vacuum interrupter chamber, on which the second coil is mounted, and the metal movable element is made in the form of a block of flat springs, the ends of which are clamped between; a magnetic conductor and a detail with a contact conclusion. The proposed vacuum switch is shown in the drawing. The switch contains a vacuum extinguishing chamber 1, on a movable contact 2 of which, using nuts 3 and 4, a membrane-type latch 5 is attached, which is a block of flat springs (membranes) made of a material that is mechanically strong and has a high electrical conductivity, for example, copper, brass, tantalum, etc. The switch actuator consists of single-layer spiral coils 6 and a block of membrane springs-latches 5 that perform the function of a disk. Coil 6, working for opening, K; repits on the magnetic core 8, which has a rigid connection with the vacuum interrupter chamber 1 and amplifies the magnetic field of the coil 6. The coil 7 is mounted on the lower cover 9, having a contact view. The edges of the membrane-latch 5 are clamped by clamp 9 with bolts 10 to the magnetic wire. The switch works as follows. The voltage pulse is applied along the control circuit to the coil 6. In this case, currents generating a magnetic field of the opposite direction are induced in the block of membrane springs 5. The interaction of the oppositely directed fields of the latch springs 5 and the coil 6 leads to the repulsive forces between them, the membrane springs of the latch 5 move downward, dragging the moving contact 2 of the vacuum arcing chamber 1 In the extreme snow 4 position SUBDITIONAL 2 contact is fixed with using membrane spring-latches 5, which thus have two fixed positions and are membrane-type latches. To return the switch to its original position, a voltage pulse is applied to the coil 7. The drive for closing is similar to the drive for opening. In the on position of the switch, the current follows the following path: moving contact 2 | membrane spring-latch block 5, cover 9, having a terminal. The presence of a gap of 0.5 mm between the magnetic core 8 and the membrane spring-latch block 5 serves to compensate for the wear of the contacts and to press them tightly in the on position of the switch. The invention consists of a vacuum circuit breaker containing a vacuum arc chamber and an induction dynamic drive with two single-layer spiral coils and with a metal movable element placed between them, mounted on the movable contact of the vacuum arc chamber, and It is due to the fact that, in order to reduce the size and weight of the switch, it is equipped with a magnetic circuit, which is rigidly connected to the vacuum interrupter chamber, on a magnetic tape recorder. Gadfly carries a second spool, and a movable metal member is a block of flat springs, whose ends are clamped between the yoke and the workpiece with a contact pin. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 524244, cl. H 01 H 33/66, 1975. 2. The patent of the USA 83723922, cl. 335-164, 1970, 3. US patent number 3723922, cl. 335-68, 1972.