SU974448A1 - Multi-contact switching device - Google Patents

Description

(54) MULTI-CONTACT COMMUNICATING DEVICE

The invention relates to electrical engineering and can be used in automatic control systems for switching several electrical circuits.

Known multi-contact switching device containing a source of magnetomotive force (MDS), the cylinder, in one end of which is mounted a movable ferromagnetic. contact, and at the other end at least one fixed contact core}.

A disadvantage of the known device is the complexity of its design.

A magnetically controlled contact is known in which a movable ferromagnetic contact core with a flat contact surface has a rectangular cross section in the bending part so that stiffening ribs are formed that provide minimum rigidity in the direction of changing the gap 2.

However, the specified magnetically controlled contact can only switch ONE electrical circuit, which limits functional capabilities.

It is also known myogokontaktnoe switching device containing

a cylinder, in the center of one of whose ends is installed, a movable ferromagnetic contact core, stationary contact cores with a FLAT contact surface installed at the other end of the balloon evenly around the circumference and concentrically movable contact core located with a flat contact surface on the sides of a regular polygon, sources of MDS installed from the outer c-Larona cylinder, one for each fixed contact core.

When an electric current is applied in the winding of ONE of the MDS sources, the magnetic field formed by this winding causes the moving contact core to close with the fixed contact core opposite to this source MDS 13.

Claims (1)

This multiple switching device has limitations for non-commuting currents and has a relatively low reliability due to the shape of the contacts used (spherical). The use of spherical contacts causes the contact core, moving towards the fixed core, to be inclined to some lateral displacement. This does not allow reliable contacting when using planar contacts. This deficiency is a consequence of the same cruelty of the movable contact core, both in the contact plane (the planes of the moving and fixed contact cores) and in the intermediate planes located outside the contact plane. And as the directional pattern of the magnetic field of the MDS source is wide enough, nothing prevents the moving contact core from moving out of the plane of contact, while ensuring the closure of contact cores outside the moving and stationary contact cores. The latter significantly limits the ability of the switching device to switch power and reduces reliability. The purpose of the invention is to increase the reliability of the device. The goal is achieved by the fact that in a multi-contact switching device the movable contact core is made with a cross section in the form of a regular polygon, similar to the polygon on the sides of which the flat contact surfaces of the fixed cores are located, and the movable contact core is installed so that the corresponding sides of both mentioned polygons parallel to each other. The increased rigidity of the movable contact core outside the contact plane prevents the movable contact core from escaping from this plane when contact is closed. This avoids the possibility of lateral closure of the contact cores and ensures planar contact between the contact cores by arranging the contact surfaces of the fixed contact cores in planes of minimum rigidity of the movable contact core. Ensuring the planar contact between the contact cores increases the switching power. In FIG. 1 shows the proposed multi-contact switching device, a longitudinal section; FIG. 2 is the same; An incision (section A-A in Fig. 1); in Fig. 3b, possible cross-sectional shapes of the bending part of the movable contact core. Inside the cylinder 1, fixed contact cores 2 made of a non-magnetic electrically conductive material are installed at one end, A movable magnetic contact core 3 having a cross section that provides the minimum rigidity of the movable contact core in the contact planes is installed at the other end in the center. For example, for a four-contact switching device, the profile may be a regular quad (fig. 3), a cruciform (fig. 4), for a six-contact device, a regular hexagon (fig. 5), a six-pointed star (fig. B), etc. From the outside of the container, opposite sources of fixed contact cores 2, sources of MDS 4 are installed, for example in the form of field windings. When applying electromagnetic current to one of the windings, the magnetic field formed by this coil causes the movable magnetic contact core 3 to close with the fixed contact core opposite to this winding. When an electric current is applied to another winding, the movable contact core 3 closes the electrical circuit with another fixed contact core, i.e. it is possible to switch each electrical circuit in any sequence. The invention of the Multi-contact switching device containing a balloon, in the center of one of the ends of which there is a movable ferromagnetic contact core, fixed contact cores with a flat contact surface, installed at the other end of the balloon evenly around the circumference and concentric with the movable contact core, located at the right contact surface polygon sources MDS installed on the outside of the cylinder, one for each stationary ontact core, about tl and h, which is so that, in order to increase reliability, in it the movable contact core is made with a cross section in the form of a regular polygon, similar to a polygon, on the sides of which there are flat contact surfaces of fixed cores, at