SU90253A1 - Device for automatic control of the ratio of two non-electric quantities - Google Patents

Description

And, A. Ilinykh

DEVICE FOR AUTOMATIC REGULATION OF THE RATIO OF TWO NON-ELECTRIC VALUES

Applied on April 5, 1948 for 376605 to the USSR State Technical University

Published in the Bulletin of Inventions .V 5 for 1951

A device is proposed for automatically controlling the ratios of non-electric quantities by adjusting the "1" of electrical values proportional to non-electric.

The device, as well as the known ones, is built according to the scheme of differential connection of these electrical quantities and differs in that in the branch of the differential circuit transformers are connected that supply alternating voltages proportional to the adjustable values, and the measuring instrument is switched on the difference of the voltage drop two branches of the scheme.

For use of a measuring instrument of direct current, rectifiers can be included in the shoulders of the circuit, and for changing the ratio of controlled values to one of the legs - a variable resistance.

The proposed electrical system for controlling non-electrical quantities has several advantages over the known hydraulic and pneumatic systems. The distance between the regulating part of the device and the actuator can be practically unlimited, the remote control of the actuators is much simpler and more reliable.

FIG. 1 is a schematic diagram of the device described; in fig. 2 - its differential scheme with the developed image of the contact system of the measuring device.

To secondary devices of flow meters U and .2, for example, fuel and air, through communication transformers 3 and 4 and cuprox rectifiers 5

90253-2-connects a highly sensitive contact zero-device 6 DC, controlling the electric actuator 7 of the controller. The secondary windings of transformers 5 and 4 and the resistances S and 9 constitute an alternating current bridge.

The primary windings of these communication transformers are electrically connected to induction sensors operating from the secondary devices of the flowmeters.

An adjustable active resistance 10 (Fig. 2) is included in one of the arms of the bridge of the regulator to define the relation between the master and the follower arms of the regulator.

To change the sensitivity, the frame of the null device 6 is shunted by resistance 11. The contact system of the null device allows the controller to vary the operating time of the actuator motor, depending on the deviation of the controlled pulse. The zero-instrument arrow is mounted on the contacts of the on-off controller 12, and the controller issues a command to open or close the regulator. As the regulator approaches the equilibrium state, the pointer of the null device of the regulator comes into contact with the step regulator 13; however, the on-off action of the regulator is terminated.

As the zero-instrument needle approaches the zero position, the duration of the command sent by the step controller decreases. This is achieved by using a three-step execution of the contact of the step regulator 13. The length of time between command delivery can be changed from 5 to 30 seconds, and the duration of the command with step control varies from 1.5 to 5 seconds.

In this way, this electrical regulator makes it possible to obtain a wide setting for obtaining the displacement of the regulator in proportion to the controlled pulse by varying the operating time of the actuator.

In the case of adjustment of one parameter, the primary winding of the second communication transformer is supplied with a compensating alternating current of unchanged voltage, which can be used to set the reference for the controller.

Subject invention

Claims (4)

1. A device for automatically controlling the ratios of two non-electric quantities, built according to a differential switching circuit of electrical quantities proportional to adjustable non-electric quantities, characterized in that the differential circuit branch includes transformers that supply alternating voltages proportional to adjustable values, and the measuring device is switched on the difference the voltage drops in the parts of the resistance included in the two branches of the circuit. 2. The device according to claim 1, characterized in that, in order to use a measuring device of direct current, rectifiers are introduced into the arms of the circuit. 3. A device according to claim 1, characterized in that a variable resistance is included in one of the circuit branches to change the ratio of the controlled values. 4. The device according to claim 1, characterized by the use of on-off control with large deviations of the ratio of adjustable values from a predetermined value and the use of step control with small deviations. .