SU630613A2 - Device for regulating production processes - Google Patents

Description

the house of the reference item to which the job is connected.

The principal scheme of the proposed controller is shown in the drawing.

The regulator contains an integral unit 1, consisting of a comparison element 2, adjustable throttle 3, tank 4, repeater 5 — a follower separator with a constant choke 6, and a proportional link, made on the basis of the second comparison element 7, and throttle adders 8 and 9. The device also includes a comparison element 10, an amplifier relay AND, a switching relay 12 from manual control to automatic.

The output of the repeater 5 is connected to the inputs of the constant chokes of the adders 8 and 9, and the inputs of their variable chokes, respectively, with the output channel of the amplifying relay 11 and with the output of the reference element 2. The outputs of the choke adders are connected respectively to the negative and positive chambers of the comparison element 7.

Adjacent plus and minus chambers of the comparison element 2 are connected via switch 13 to the channels of the parameter Rpar and the Rzad reference, and the output of capacity 4 to the chamber of the reference pressure of element 2 adjacent to the flow chamber in which the feed nozzle is located.

In accordance with the concept, the regulator implements the following law:

Р - (Р „Р -,. V pairs 3W Aj

+ Y (par-Yazad) /, V

where K.i is the gain factor of the throttle adders;

3 /

Kz is the gain constant of constant droplets 6;

Hz is the integration time adjusted by the variable choke.

Since in the steady state the pressure differential across the adjustable throttle 3 is zero, the pressure in the flow chambers and the feedback chambers of the reference element are also equal to each other, and therefore the pressure differential on the measuring membranes of the throttled positive feedback chamber is absent. This prevents disruption of the tightness of the membrane and ensures practical independence of the accuracy of the regulator from possible leaks through the membranes of the throttled chamber.

The invention can be used in pneumatic PID controllers of the relationship with local and remote tasks.

Claims (1)

Invention Formula A device for regulating technological processes according to the author. St. No. 310231, characterized in that, in order to improve the accuracy of the device, therein a reference pressure chamber of the integral unit element is located behind the flow chamber with a power nozzle, and the input of the integral unit element to which the parameter is connected is a chamber adjacent to the chamber Which is the input of the comparison item to which the job is connected. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 310231, cl. G 05B 11/60, 1969.