SU549602A1 - Pneumatic device for determining the minimum - Google Patents

Description

This invention relates to pneumatic analog computing devices designed to select from a minimum of input signals.

Pneumatic devices for selecting the minimum are known, containing pulsating vessels, the control cavities of which are connected to the input channels and the working cavities are connected to the input chamber of the repeater.

The disadvantages of the known devices include low dynamic accuracy.

Closest to the proposed pneumatic device for selecting the minimum, there are single-membrane elements, the deaf chambers of which are connected to the inlet channels, the flow-through chambers are connected to the output channel and through the throttle to the feed channel and their nozzles are connected to the atmosphere.

With a large number of input signals, the known device has a low static accuracy due to leakage of elements through the nozzles due to their imperfect closure.

The purpose of the invention is to improve the accuracy of determination of the quantity.

To achieve {n this goal, the proposed device is equipped with a single-membrane element with a spring located in the flow

the chamber, which is connected to the single-membrane elements, the deaf chamber of the additional single-membrane element with the spring is connected to the output channel, and its

nozzle - with the atmosphere.

A schematic diagram of the device is shown in the drawing.

The device contains single-membrane elements / 1-J „, throttle 2 and additional

single-membrane element 3 with a spring located in the flow chamber.

Deaf cameras of the elements are connected to the channels of the input signals P, -P ,, and their flow-through chambers are connected to the output

the channel of the RZ ,, to the deaf chamber of the membrane diaphragm 3 and are connected via a choke 2 to the feed channel. The flow chamber of the membrane diaphragm 3 is connected to the nozzles of the / j- / „elements, and its nozzle is reported

with the atmosphere.

The device works as follows. The sonl of the element, the deaf chamber of which is connected to the channel with the minimum level of 1g; about the input signal, is slightly opened, and the nozzles

the remaining items are closed. The output channel is set to a pressure equal to the minimum of the input: Р ayh in (Р, р. Р)

g. . ,, I f f.

Since the pressure in the flow chamber of the element -3 is lower than the output pressure by the value D determined by the shift of the spring, a constant pressure differential L is established at the nozzles of the elements (i - /), resulting in a decrease in the gas flow through the ideally closed soles ( leakage).

The described device makes it possible to reduce the error in determining the minimum from 100 (for the prototype) to 20 mm of water. Art.

Claims (1)

Invention Formula Pneumatic device for determining the minimum contained by its odiomembrane elements whose main chambers are connected to the input channels, flow chambers are connected to the output channel and through the choke to the power channel, distinguished by the fact that, in order to improve accuracy, determine the minimum, it has an additional single-membrane element with a spring located in the flow chamber, which is connected to the nozzles of the single-membrane elements, the chamber of the additional single-membrane element with the spring is deaf, connected to the output channel, and its nozzle to the atmosphere.