SU1005076A1 - Pneumatic device for deviation indication - Google Patents

Description

The invention relates to instrumentation, namely, to pneumatic zone indication devices for use in tolerance control systems.

A pneumatic zone indication device is known comprising first and second single-membrane elements (OE) and a choke, the inlet channel being connected to the flow chamber of the first OE, the reference pressure channel with the deaf chamber of the second OE, and the nozzle of the first OE through the choke is connected to the atmosphere 1.

A disadvantage of this device is that it does not allow an inverse function to be performed.

It is also known a pneumatic device containing two throttles and the first, second and third single-membrane elements, the deaf chambers of the first and second OE are connected to the reference pressure channel, flow through the inlet channel, the nozzle of the first OE through the first choke is connected to the atmosphere and the nozzle of the third OE from with the second choke -23.

A disadvantage of the known device is that it requires complicated adjustment, since the reference pressure

does not coincide with the nominal value of the controlled pneumatic signal.

The purpose of the invention is to simplify the setting of a pneumatic zone indication device.

This goal is achieved by the fact that

J.Q pneumatic deviation indication device containing two drossel, the first, second and third single-membrane elements (OE), deaf first:. The second OE is connected to the reference pressure channel, the flow 15 to the inlet canal, the nozzle of the first single-membrane element is connected to the atmosphere through the first choke, and the nozzle of the third OE is connected to the second choke, additionally installed

20, the third choke, the flow chamber of the third OE is connected to the nozzle of the first single-membrane element, to the deaf directly to the nozzle of the second mono-membrane element and through the third choke to the atmosphere, and its nozzle is connected directly to the output channel and to the second choke to the atmosphere. The drawing is presented (1a diagram

30 devices.

Claims (1)

A pneumatic deviation indication device containing two throttles and a first, second and third one25 membrane elements, blind chambers of the first and second single membrane elements are connected to the reference pressure channel, flow-through to the inlet channel, the nozzle of the first single membrane element is connected to the atmosphere through the first throttle, and the nozzle of the third single-membrane element is connected with the following of the first and elements ^p ₀ +, ^ 2, - offset 7 / ^r o - ^R V'L And p e> x where and the second single-membrane 3 and 4. The device works in a manner. If the input signal ( ^p e *) is greater than the upper threshold level Ρ _ο + Δρ_, the pressure P _x in the line of the nozzle 17 of the second single-membrane element 4 is different from atmospheric: P _x - P ₀ y. This leads to the closure of the nozzle 13 of the third single-membrane element 5, the output signal of which (Ρβχ.) Assumes a zero value Р ₀ уу = 0. Similarly, for Р &><Р _о ~ Δ4, the pressure in the line of the nozzle 12 of the first single-membrane element 3 and, therefore, you are a second throttle, characterized in that, in order to simplify the setup, a third throttle is additionally installed in it, and the flow chamber of the third single-membrane element is connected to the nozzle of the first single-membrane element, blind - directly to the nozzle of the second single-membrane element and through the third throttle to the atmosphere, and its nozzle is connected directly to the output channel and through the second throttle to the atmosphere.