SU583494A1 - Vacuum switch - Google Patents

Description

one

The invention relates to electrical engineering, in particular to vacuum switches, intended for switching electrical and radio circuits.

Vacuum switches containing a vacuumized chamber are known; contacts that are installed on the inputs are not suitable; a movable contact is rigidly fixed through an insulator on the cortex of an electromagnet freely mounted on an axis located in the holes of the electromagnet ij nS21

As is well known, in a high vacuum, a series of metals, which include magnet materials, have a tendency to cold diffusion welding of the mating surfaces of parts that are under insignificant pressure- Having always had an unbalanced response | in the core and the body under the axis, as well as direct contact in the specified

above the products of a magnetically soft material with an axial material, when the bale is rotated by the surfaces of the axle and holes, a very large friction force occurs and mechanical transfer of the magnetically strong occurs.

metal on the surface of the core, which further leads to the appearance of micro-welds on the core joining on the axis.

To reduce the friction force in vacuum, solid lubricants are applied by different methods on the rubbing over the top. Among them, the most widespread in quality (vashly graphite grease and molybdenum disulfide 3j.

However, these materials are characterized by a limited resource, a significant gassing during friction, and the products of gas emissions of materials can react chemically with the surfaces of electrical contacts. The presence of particles of solid lubricant with the ability to move freely inside the device leads to electrical inter-contact clearance.

The aim of the invention is to eliminate the likelihood of seizure (micro welding) of the core on the axis and thereby increasing the reliability of the switch.

Claims (3)

To this end, the core axis is installed with the possibility of being covered around its own axis and made of glass. 3 In FIG. 1 shows the proposed switch when the Kongakg is open; in fig. 2 - section A-A of FIG. one; and in fig. 3 - section bb FIG. 1. The vacuum circuit breaker has a cylindrical glass envelope 1, the vacuum is tightly t soldered to the molybdenum outputs, contacts 2 and the transition ring 3 from the covar, with which a diamagnetic cylinder 4 is connected to a vacuum tightly connected with welding; the core 5 is made of a magnetically soft material and mechanically firmly with a ring 6 of a magnet of a flexible metal, which is part of the body of an electromagnet located in a vacuum. The second element of the electromagnet body is a magnetically soft metal body 7, located outside the vacuum envelope and coupled to the ring 6 through the bottom of the diamagnetic cylinder 4. To the inner surface of the ring 6, through a nickel plate 8, a non-spread gas absorber 9 is rigidly attached. using the overlays 10 welded to the ring, the axis 11 is movably fixed on which it rotates. Measles 12 electromagnets on a magnet of a bland metal A moving contact is rigidly fixed on the bark 12 of the electromagnet through an insulator. The open position of the contacts is provided by a return spring 13, j and the required gap between the fixed terminals - contacts 2 and. A movable contact is provided with a device made on ring 6. A control coil 14 is provided for controlling the movable contact fixed on the core. The axis of the glass is made on which the magnet of a soft metal rotates. allows the star to reduce the frictional force in vacuum between the axle surfaces and core corners, and since glass does not tend to cold diffusion welding in vacuum, the likelihood of microwelding and axial blocking during core operation is excluded. The use of an axis that does not have a rigid fixation in the body of an electromagnet makes it possible to increase the reliability of the operation of the moving switch system due to the additional degree of freedom of rotation of the core from the rotation of the OCP in the openings of the body of the electromagnet. 1. Vacuum circuit breaker containing an accumulated chamber, fixed contacts installed on the inputs, i a moving contact rigidly fixed through a sol on the electromagnet cortex fixedly mounted on an axis installed in the holes of the electromagnet housing, Improving the reliability of operation, the axis of the CDR is installed with the possibility of rotation of its axis. 2. The switch according to claim 1, characterized in that, in order to increase reliability by reducing friction forces to eliminate cold welding of the axis to the core m, the core axis is made of glass. Sources of information taken into account in the examination: 1. US patent Ne 3541484, And, 01 And 33/66, 1974. 2. USSR author's certificate No. 305517, AND 01 H 33/66, 1971. 3. Kragelsky I.V. and others. Friction and wear in a vacuum, M., Mashinostroenie, 1973. one P .2 6-6