SU1355980A1 - Pneumatic analog amplifier - Google Patents

Abstract

The invention relates to pneumatic automation means, namely to analog amplifiers, intended for use in conjunction with nozzle-flapper assemblies, for example, in positioners. The purpose of the invention is to ensure the independence of the output pressure signal from the change in supply pressure. The pneumatic analog amplifier contains the first 2 and second 3 membranes installed in the core / pus 1, the rigid 15 centers of which are interconnected, and the effective area of the first membrane is larger than the effective area of the second membrane. The supply valve seat 5 is made in the bulkhead 4 of the housing located between the power supply chambers 9 and outlet 11. The reset valve seat 6 is made in the rigid center of the second membrane located between the output outlet 11 and the intermembrane cavity 10 communicated with the atmosphere. The supply and reset valve spools are rigidly interconnected by the rod 7 and are connected to the spring 8 installed in the power chamber 9, the tuning spring 17 is placed in the control chamber 13 located between the first diaphragm 2 and the housing and communicated with the control channel 19 and through the first choke 12 with an output chamber 11. The amplifier is equipped with a second choke 14, through which the power supply chamber 9 is connected to the camera of the 11 input. 1 sludge. 19 IS rj II // & in (L with JV QD 00

Description

The invention relates to pneumatic automation means, namely to analog amplifiers intended for use in conjunction with cone units.

As the pressure in chamber 13 increases, the dual membrane unit moves downward, reducing the air flow through the relief valve. With a large change in pressure in chamber 13, closing the valve on the vent does not lead to equilibrium of the membrane unit, which continues to move downwards, which causes the supply valve to open. As a result, the pressure in the chamber 11 increases to the value at which it will again reach

Lo-damper, for example, in positioners.

The purpose of the invention is to ensure the independence of the output pressure signal from the change in supply pressure. Q

The amplifier circuit is shown in the drawing.

The first and second membranes 2 and 3 are installed in the housing 1, the rigid centers of which are interconnected. The effect-imbalance of the membrane block equilibrium. The area of the membrane 2 is larger than the effective area of the membrane 3. In the bulkhead of the housing 4, a power supply saddle 5 is made, and in the rigid center of the membrane 3 a seat 6 of the relief valve is made. 20 Valves of supply and discharge valves are rigidly interconnected by a rod

7 and are associated with a spring 8 located in the supply chamber 9. Cavity 10

between membranes 2 and 3 communicates with the 25 th apt, the saddle of which is made in the sphere.

The output chamber 11 is connected via the first throttle 12 to the control chamber 13 and through the second throttle 14 to the power supply chamber 9. The camera 11 is also connected to the output channel 15, and the camera 9 is connected to the power supply channel 16

The control chamber 13 is fitted with a tuning spring 17, the force of which is adjusted by means of the sleeve 18. The chamber 13 is connected by a control channel 19 to the nozzle of the spool-spool assembly (not shown).

The amplifier works as follows:

Pneumatic analog amplifier, containing 1st installed in the case of the first and second membranes, whose rigid centers are interconnected, and the effective area of the first membrane is greater than the effective area of the second membrane, valve PI30

35

the body partition located between the feed and outlet chambers, the relief valve, the seat of which is formed in the rigid center of the second membrane located between the outlet chamber and the intermembrane cavity communicating with the atmosphere, and the spools of the power supply valves h of a spring installed in the supply chamber and a tuning spring placed in the control chamber located between the first membrane and the housing and directly connected to the control channel and through the first choke with swarm output, characterized in that in order to provide nezaviaimosti output pressure measured by the pressure Neny power amplifier provided with a second throttle, via Ko toryu feed chamber is connected with the output chamber ..

zom.

In steady state, the membrane unit with membranes 2 and 3 is in equilibrium under the action of pressure in chambers 11 and 13 and the force of spring 17. Air flow through the throttle 14 compensates for air release through a nozzle connected to chamber 13 and through a relief valve. In the established Editor I. Rybchenko

Compiled by N. Lanin Tehred A. Kravchuk

Order 5794/42 Circulation 671

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

with the power valve mode is always closed.

As the pressure in chamber 13 increases, the dual membrane unit moves downward, reducing the air flow through the relief valve. With a large change in pressure in chamber 13, closing the relief valve does not lead to equilibrium of the membrane unit, which continues to move downwards, which causes the supply valve to open. As a result, the pressure in the chamber 11 increases to the value at which it will again reach

equilibrium of the membrane block is maintained.

equilibrium of the membrane block is maintained.

Claims (1)

Invention Formula Pneumatic analog amplifier, containing 1st installed in the case of the first and second membranes, the rigid centers of which are interconnected, and the effective area of the first membrane is larger than the effective area of the second membrane, the supply valve, the seat of which is made the body partition located between the feed and outlet chambers, the relief valve, the seat of which is formed in the rigid center of the second membrane located between the outlet chamber and the intermembrane cavity communicating with the atmosphere, and the spools of the power supply valves h of a spring installed in the supply chamber and a tuning spring placed in the control chamber located between the first membrane and the housing and directly connected to the control channel and through the first choke with swarm output, characterized in that in order to provide nezaviaimosti output pressure measured by the pressure Neny power amplifier provided with a second throttle, via Ko toryu feed chamber is connected with the output chamber .. Proofreader M. Sharoshi Subscription