SU400922A1 - SPEED RELAY - Google Patents

Description

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The invention can be used in systems of hydro or pneumatic automation, in systems of measuring equipment, automatic adjustment and in counter-resolvers.

Speed relays are known that contain a non-magnetic, electrically conductive partition associated with the collapse of the shaft, and control magnets acting on pneumatic or hydraulic sensing elements having movable diaphragms.

The purpose of the invention is to simplify the relay interface with pneumatic or hydraulic systems.

This is achieved by the fact that the membranes of sensing elements are made ferromagnetic and are mounted against control magnets.

Figure 1 shows schematically the proposed speed relay.

The speed switch soda holds a disk 1 made of a non-magnetic material with electrical conductivity, such as copper, aluminum, etc. The disk is connected to the rotating shaft 2 of the mechanism, the speed of which is controlled. A permanent magnet 3 is mounted on one side of the disc, and a pneumatic or hydraulic sensing element, on the other hand, is, for example, a known device.

pressure, and a nonmagnetic magnetic core 4. The amplifier consists of a relay nozzle-damper, including a constant choke 5 and a continuous choke 6, and a membrane unit with two membranes — the main 7 and the separating 8. The membranes are interconnected by a rod 9, The torin of which is simultaneously a damper for variable throttles 6. Membranes and partitions are formed in the body 4 of the chamber 10-13. Chamber 10 is pneumatically connected to throttle 14 and has an adjustable throttle 15. Chamber 11 is pneumatically connected via throttle 16 to chamber 13 and has an adjustable throttle 17. Chamber 13 is connected through atmosphere to the throttle 6 and chamber 12.

The main membrane 7 is made ferromagnetic and is aligned with the magnet 3, and inside the case 4, in place of its alignment with the magnet, pole pieces 18 of a magnet of a soft material are mounted.

In chamber 10, a constant choke 14 is supplied with pressure divided by a pneumatic divider consisting of a standing 14 and an adjustable 15 chokes. The membrane 7 tends to be pressed by the magnetic forces of the permanent magnet 3 to the poles of the tips 18. The degree of approximation of the membrane 7 to the tips depends on the ratio of the magnetic forces H to the forces of water but not compressed pressure.

air in the chamber 10 and is regulated by the choke 15. When the disk 1 rotates in the field of the permanent magnet 3, eddy currents form in it, which create a demagnetizing field, which reduces the total magnetic note acting on the membrane 7.

The degree of flux attenuation is proportional to the speed of rotation of the disk. The membrane 7 tends to move away from the tips. The amount of movement of the membrane depends on the speed of rotation of the disk. Moving the damper (stem 9) causes the throttles 6 to overlap. Chamber 13 is supplied with pressure through choke 5, which changes when the wall of the throttle 6 does not open is unloaded. including a constant choke 16 and an adjustable choke 17, into the negative feedback chamber 11. The presence of two adjustable chokes 15 and 17 allows for a wide variation in the relay transmission ratio.

By varying the pressure in chamber 10, it is possible to remotely or programmatically change the sensitivity of the relay. The sensing element may have a different design, for example in

Chamber 10 can be fitted with a spring, eliminating the need to supply pressure to it, and a feedback chamber may also be missing. In the case of a speed relay interfacing with hydraulic systems, the sensing element may be hydraulic.

In order to obtain a series of signals at certain speeds, several sensitive elements and magnets are installed, having different triggering thresholds.

When using a relay as a proportional element, the sensing element is made with proportional dependence.

Subject invention

A speed switch containing a non-magnetic electrically conductive partition, connected to a rotating shaft, and control magnets acting on pneumatic or hydraulic sensitive elements having moving diaphragms, characterized in that, in order to simplify its interface with pneumatic or hydraulic systems, sensitive membranes the elements are made ferromagnetic and mounted opposite the control magnets.

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