SU499603A1 - Switch - Google Patents

Description

one

The invention relates to control elements for switching electrical circuits.

To alternately connect several electrical circuits to the power source, in a number of cases, switches are used on reed switches controlled by the field of the moving permanent magnet. With small values of the return coefficient used in such switches, reed switches and a small distance between them does not ensure their separate operation.

Switches are known in which the return coefficient of a reed switch is increased by supplying it with a biasing coil connected to a power source through its own contacts. However, increasing the return coefficient of reed switches in multi-chain switches (especially at small distances between reed switches) does not guarantee the required closing sequence of the contacts of the next (along the magnet) reed switch after opening the previous contacts due to the relatively large volume occupied by the control magnet, and a significant variation in magnitudes of magnetizing forces (n. s.) of the switch actuators.

In order to increase the reliability of the separate operation of reed switches, which guarantees

The sequence of connecting electrical circuits to a power source, in the proposed switch, each reed switch is provided with an additional bias coil connected to the power source through the contact of the previous one, near the reed switch. If necessary, ensure the normal operation of the switch during the reverse movement of the control magnet each reed switch

provided with a second bias coil connected to the power source through the contact of the reed switch located on the other side.

FIG. 1 shows schematically a switch with elements of electrical load and adjustment circuits, a possible variant; in fig. 2 shows the relative position of its permanent magnet and reed switches. The movable permanent magnet 1 is designed to control reed switches 2-5. Each of the reed switches is provided with bias coils that are wound directly onto the reed switch flasks. Biasing coil 6 reed switch 3

connected to a power source through its own contacts and is designed to adjust the moment of release of the reed switch 3 by changing it n. with. release, which can be achieved, for example, by using resistance RQ. With a given, shown in

FIG. 1 figure arrow, direction of movement of the magnet 1 biasing coil 7 of the reed switch 3 is connected to the source of the thread through the contacts of the reed switch 2. Coil 7 is used to adjust the moment of response of the reed switch by changing it n. with. actuation, carried out with the aid of resistance. If, according to the operating conditions of the switch, the reverse movement of the magnet is necessary, then an additional magnetizing coil 8 must be placed on each of the reed switches, the purpose of which is the same as the coil 7. The coil 8 must be connected to the power supply through the contacts sides of the approaching magnet.

Thus, when changing the direction of movement of the magnet 1 to the opposite direction indicated in FIG. The 1 reel 8 of the reed switch 3 is connected to the power source via the contacts of the reed switch 4 and the variable resistance Rs.

As magnet 1 approaches the reed switch 2 in the working gap of the latter, the flux created by the magnet Fm increases. At the moment when the flow Fm reaches the magnitude of the flow of operation of the reed switch 2, the contacts of the latter are closed, simultaneously closing the electrical circuit of the load resistance Rn and the circuit of the magnetizing coils 6 and 7.

The direction of winding and the polarity of the connection of coils 6 and 7 are such that the flows Fe and Ft in the working gaps of the reed switches 2 and 3, created by currents flowing in the coils 6 and 7, are directed oppositely to the flow Fm. In this case, the Fb flow contributes to an increase in with. releasing the reed switch 2, i.e., it accelerates the moment of opening of its contacts when the magnet 1 passes. With the opening of the contacts of the reed switch 2 (position B of the magnet 1), the electrical circuits of the coils 6 and 7 are broken, the flows Fb and Fg disappear and the reed switch 3

under the action of the flow FM closes its contacts. The closure of the contacts of the reed switch 3 in the manner described keeps the contacts of the reed switch 4 from the closure, following along the course of the magnet, etc.

The action of the biasing coil 8 with the direction of movement of the magnet 1, opposite to that indicated in FIG. 1, does not differ in any way from the action of the biasing coil 7 in the direct direction of movement of the magnet.

The use of a biasing coil in the switch in order to increase the reliability of the separate actuation of reed switches allows, moreover, to use reed switches in the switch with a sufficiently large spread of n. with. actuation and release. At the same time, the influence of individual properties of reed switches on the alternating switching of electrical load circuits is eliminated by adjusting the current in the biasing coils.

Claims (2)

1. A switch comprising reed switches, control windings and a movable control magnet, which, when moved, sequentially acts on reed switches, characterized in that, in order to increase the reliability of the separate actuation of the reed switches; each reed switch is equipped with a bias coil connected to the power source through a contact of a number of the previous reed switch located, the winding direction and polarity of the connection indicated coils are such that the magnetic flux from it in the working gap the reed switch is always directed counter flow from the control magnet. 2. A switch according to claim 1, characterized in that, in order to increase the reliability of the separate actuation of the reed switches in the reversing mode of motion of the magnet, each reed switch is equipped with a second bias coil connected to a power source through the contact of the reed switch located on the other side. .2