SU1290275A1 - Gas pressure regulator - Google Patents

Abstract

The invention relates to instrument engineering and can be used in a pneumatic automation system where precise control of gas pressure is required, as well as chromatographic and gas analysis devices for controlling the pressure of carrier gases and analyzed gases at particularly low flow rates. The aim of the invention is to improve the control accuracy, increase the reliability of the controller, increase speed, reduce the volume of gas cavities and reduce the complexity of tuning. The gas pressure regulator contains a housing 1 with an input 2 and an output 3 channels, a cover 4 with a spring 5 installed in it, a membrane sensing element 7 and a regulator 6 of the nozzle-damper type with a nozzle connected to the inlet channel by a flexible tube 10. Sensitive element 7 is made in the form of in the left membrane and used as a flap. On one side of the membrane, a figured nozzle 9 is formed and pressed to it, forming a flow chamber connected to the output channel 2 with the central part of the membrane; on the other side of the membrane, an adjustable stop 14 is installed in the lid partition wall, the end of which is pressed to the membrane 7 and has an air cavity 15. The membrane through the support ring 16 and the rods installed in the openings of the partition wall of the lid 4 is connected to the preload spring B. 1 Il. i (L 1CHE SO o yu | SP 75 7J

Description

The invention relates to instrumentation engineering and can be used in pneumatic automation systems for precise pressure control of gas, as well as in chromatographic and gas analysis devices for controlling pressure of carrier gases and analyzed gases at particularly low flow rates.

The aim of the invention is to improve the accuracy, reliability, increase the speed of the controller.

The drawing shows a gas pressure regulator circuit.

The pressure regulator contains a housing 1 with an inlet 2 and an outlet 3 channels, a cover 4 in which a spring 5 is installed and an adjusting screw 6. A membrane sensor element 7 is installed in the membrane as a seal between the housing 1 and the cover 4. On the underside of the membrane 7, a cup 8 is installed with a nozzle 9 connected to the inlet channel 2 by a flexible tube 10 and a spring 11 pressed to the membrane 7. The membrane 7 and the cup 8 with the nozzle 9 form a flow chamber 12 connected through a directional tube 13 with exit 3. On the upper side of the membrane 7, an adjustable stop 14 is installed in the partition wall of the cover 4, rests on the lower end of the membrane 7 and has a cavity 15. The support ring 16 is pressed against the membrane 7, between which is pressed against the spring 5 in the hole x partitions of a cover are established pushers 17.

The regulator works as follows.

High pressure gas through the inlet channel 2 and the flexible tube 10 enters the nozzle 9. In an adjustable gap between the outlet of the nozzle 9 and the central part of the mambran 7, the gas pressure decreases, the gas enters the flow chamber 12 and acts on the central part of the membrane 7, deflection it toward the support ring 16 and the adjustable stop 14. Bending, the membrane encloses the end of the adjustable stop 14 and pulls on it, creating an ideal flap plane. From the supply chamber 12, the reduced pressure gas through the guide tube 13 enters the outlet channel 3 and through the gaps in the nozzle openings for the guide tube to the cavity under the membrane 7.

On the sensitive element - the membrane 7, the forces generated from one side of the membrane are balanced by the gas pressure and the spring 11, and the force created by

Compiled by A. Abarinov

Editor A. GulkoTehred.I. VeresKorrektor M. Pojo

Order 7901/45 Circulation 864Subscription

VNIIPI USSR State Committee for Inventions and Discoveries

113035, Moscow, Zh-35, Raushsk ng: b., D. 4/5 Production and Printing Enterprise, Uzhgorod, ul. Project, 4

On the other side of the membrane, press the spring 5, which is transmitted to the membrane through the rods 17 and the support ring 16. When balancing, the membrane 7 bends and moves the cup 8, changing the gap between the outlet nozzle 9 and the central part of the membrane 7, tensioned on the end of the adjustable stop 14 and ensuring stabilization of the pressure drop across the executive body. The outlet pressure of the regulator depends on the force of preloading the spring 5 with the adjusting screw 6. Adjusting the stop 14 adjusts the gap between the nozzle and the valve, and its location outside the gas cavity of the regulator allows adjustment without disassembling the regulator and during operation.

By changing the position of the adjustable stop 14, the pressure regulator is adjusted depending on the required gas flow — with a small gas flow, the minimum clearance between the nozzle and the flap is set.

A cavity 15 at the end of the adjustable stop prevents the surface of the membrane from compressing the grooves during compaction with a nozzle and improves the membrane tension.

Claims (1)

Invention Formula A gas pressure regulator comprising a housing with inlet and outlet channels. A cover with a preload spring installed in it, a sensitive element in the form of a membrane and a regulator such as a nozzle, a damper, the nozzle of which is connected to the inlet channel by a flexible tube, characterized in that, in order to improve the accuracy, reliability, increase the speed of the controller, was used as a regulator valve of the nozzle-valve type, the nozzle is made in the tip of a glass spring-loaded to the membrane, which forms a flow chamber connected to the output part of the membrane nalom, on the other side of the membrane in the partition cover is mounted the adjustable stop with its end contacting with the membrane, and in the end part of the adjustable stop a recess, and the pressing spring is associated with the membrane via tappets and the support ring.