SU1597957A2 - Sealed power contact - Google Patents

Abstract

This invention relates to electrical engineering, in particular to hermetic power contacts. The aim of the invention is to increase switching capacity and reliability. The surface of the pole 7, on which the ferromagnetic plates 21 and 22 are fixed, and the contacting surfaces of the fixed contacts 13, 14 are located at the same level, relative to the bottom of the Gersikon. The main ferromagnetic plate 21 is made in a stepped form, with the length of one of the steps chosen such that it overlaps both poles, and the second step is located below the first and is the loose end of the main ferromagnetic plate divided into two longitudinal symmetrical parts. Due to such an arrangement, the vibration of the moving contacts is significantly reduced when switched on, the possibility of contact welding is eliminated, and consequently, the switching capacity and reliability of the device are improved. 1 hp ff. 2 Il.

Description

26

(L

13

SP

with sd

TO)

The invention relates to electrical engineering, in particular to hermetic power contacts, hersicons, designed to perform the functions of contactors of contactors, and is an improvement of the known hersicon according to the author. St. No. 1144156.

The aim of the invention is to increase the switching capacity and reliability of the device by eliminating the possibility of welding the contacts.

FIG. 1 shows a sealed force contact, a longitudinal section; in fig. 2 - the same, top view.

The hermetic power contact consists of an insulating ceramic shell and the housing 1, and a metal bottom 2. The main supporting part is the housing 1, on which all the assemblies and parts of the herson are mounted. The housing 1 is made in the form of a box with four holes 3-6 with metallized beams. Holes 3 and 4 are designed to accommodate ferromagnetic poles 7 and 8, which are soldered with the help of shields 9 and 10 to the metallized beams of these holes. Holes 5 and 6 are used to accommodate adjustment screws 11 and 12, carrying fixed contacts 13 and 14. Squares 15 and 16 are soldered to the plated holes 5 and 6, which are current leads for external wiring connections and at the same time serve to fasten adjusting screws 11

  2-

From the outside of the housing 1 between the squares 15 and 16 there is a pocket 17 in which a permanent magnet 18 is placed. The outer side of the pocket 17 inside the housing 1 between the contacts 13 and 14 creates a partition that forms two separate arcing chambers for each pair of contacts: the stationary 13 and movable 19 contacts, fixed 14 and movable 20 contacts.

A bark is attached to the ferromagnetic pole 7, made in the form of the main ferromagnetic plate 21 and a set of thinner ferromagnetic plates 22 supported on the stop 23 pressed together with the ferromagnetic shunt 24 to the ferromagnetic pole 7 with a screw 25. The main ferromagnetic plate 21 forms with a ferromagnetic pole 8, the working gap b (Fig. 1), which makes it possible to move the core when exposed to an external magnetic field created by the coil 26 seated on the core 27.

The ends of the ferromagnetic poles 7 and 8 are inserted inside the housing 1. The end of the pole 7) is flush with the contacting surfaces of the fixed contacts 13 and 14 fixed on the adjusting screws II and 12 relative to the bottom 2. The end of the pole 8 ends 1 to 2 mm higher that provides pushing contacts. Thanks to this arrangement of the poles 7

ten

g 20 op

thirty

five

g 0

five

0

and 8 the working surface of the main ferromagnetic plate 21 (in the process of its movement under the influence of a magnetic field created by the coil 26) at the time of initial contact of the moving contacts 19 and 20 with the fixed contacts 13 and 14 lies in the same plane with the contact surface and perpendicular to the plane through the OS .. And the adjusting screws 11 and 12, carrying fixed contacts 13 and 14. Thanks to this mutual arrangement of the poles 7 and 8 and the fixed contacts 13 and 14 during the further movement of the bases second ferromagnetic plate 21 and the deformation oto- bent portion to complete abutment with the open part of the working surface 8 poles virtually eliminated vibration of the movable contacts 19 and 20 with respect to the fixed contacts 13 and 14.

To ensure that the contact surfaces, perpendicular to the axis of the adjusting screws 11 and 12, carrying fixed contacts 13 and 14, coincide with the working surface of the main ferromagnetic plate 21, are made stepwise, the length of the section of one of the steps is chosen such that it covers both poles 7 and 8, and the area forming the other stage is the loose end of the main ferromagnetic plate 21, divided into two longitudinal sym-, metric parts, to each of which a rim 28 and 29 are attached a U-pattern - contact pins 30 and 31, carrying movable contacts 19 and 20. A stage with movable contacts is located below the first stage. The movable contacts 19 and 20 are interconnected by a flexible connection 32 and 33 of a high-elastic elastic bundle, the ends of which are attached to the inner surface of the washer 10. The current lead 34 is additionally attached to the outer surface of this washer 10.

Contact works as follows.

When a voltage is applied to the kagushka 26, the main ferromagnetic plate 21, together with a set of thinner ferromagnetic plates 22, is attracted to the pole 8. As a result, the contacts are closed: non-movable contact 13 - moving, contact 19 and fixed contact 14 - moving contact 20. At By disconnecting the voltage, the main ferromagnetic plate 21 falls off and the contacts are opened.

In those cases, when an additional, —– –– current electric lead 34 is used, it can switch two circuits: one circuit through the fixed contact 13 - the moving contact 19 and the second circuit through the fixed contact 14 - the movable contact 20.

Thus, in comparison with the known, the proposed contact allows to significantly reduce the vibrations of the moving contacts.

when turned on, eliminate the possibility of welding contacts, and thus increase the switching capacity and reliability.

Claims (2)

1. Sealed power contact auth. St. No. 1144156, characterized in that, in order to increase the switching capacity and reliability, the ferromagnetic pole, on which the main and additional ferromagnetic plates and fixed contacts located on the adjusting screws located inside the insulating ceramic shell, are mounted at the same level relative to the metal of the base plate, the main ferromagnetic plate is stepped with two kinks, the length of the section of one of the steps is chosen such that it overlaps both poles, and the section forming the other step below the first stage is the loose end of the main ferromagnetic plate divided into two sold „1 symmetrical parts. 2. A contact according to claim 1, characterized in that it is provided with an additional current lead mounted on an insulating ceramic shell, said additional current lead connected to a flexible electrically conductive tongue. 3 7/5,