RU2201615C2 - Integrating pneumatic amplifier - Google Patents

Abstract

FIELD: automatic control equipment. SUBSTANCE: invention can find use in pilot pressure regulators of gas supply system in public utilities. Integrating pneumatic amplifier has chambers of static 1, controlling 25 and outlet 5 pressures and chamber 21 under membrane, body 22, setting spring 2, membranes 3, 20 and 23 intercoupled by means of rod 4 carrying pushers 6 and 18. Two bell-cranks loaded with springs 19 and 17 are installed in output pressure chamber 5 on axles 8 and 16 anchored in body 22. Arms 26 and 24 of bell-cranks are linked to pushers 6 and 18 and other arms 7 and 12 carry valves 9 and 13 interacting with seats 10 and 14 communicating with pneumatic conduits 11 and 15 with pressures P₁ and P₂ correspondingly. Chamber 21 located under membrane communicates with the aid of conduit 27 with control chamber 25. EFFECT: raised accuracy of pneumatic amplifier thanks to prevention of influence of output pressure on adjustment controlling pressure. 1 dwg

Description

 The invention relates to techniques for automatic regulation and can be used in pilot pressure regulators, in the gas supply system of the public utilities.

 Known integrating pneumatic amplifiers working with pilot gas pressure regulators (amplifier pressure regulator indirect action, patent 2035059, Bull. 13, 1995).

 The integrating pneumatic booster contains a housing, chambers of static, control and output pressures, two membranes fixed at the periphery with the housing, between which a control pressure chamber is located, a task spring with a control element connected to the first membrane and placed in a static chamber, a spring-loaded two-arm lever installed in the outlet pressure chamber on a first axis fixed in the housing, one arm of which contains a first valve connected to the first seat, communicating the outlet pressure chamber with th input of the servomotor, and the other arm is connected to the rod, and the second valve seat.

 Its disadvantage is the effect of the output pressure on the tuning due to the formation of additional force on the second membrane from changes in the output pressure, which impairs the accuracy of the amplifier.

 The aim of the invention is to increase the accuracy of the amplifier by eliminating the influence of the output pressure on the control pressure control.

 This goal is achieved by the fact that a third membrane with a sub-membrane chamber and a second spring-loaded two-arm lever rotating on a second axis fixed in the housing are introduced into the outlet pressure chamber, the second seat communicating with the second input of the pneumatic amplifier, fixed in the housing and connected with a second valve fixed on one of the shoulders of the second spring-loaded two-arm lever, the membranes are fixed to each other by a rod connected to the two-arm arms and interacting with them in antiphase, and the control pressure chamber submembrane communicates with the camera.

 The analysis of patent, information and catalog materials on integrating pneumatic amplifiers by the funds of the regional scientific and technical library of the city of Saratov allows us to conclude that the proposed solution is not known from the prior art, i.e. it is new. In addition, the proposed device does not follow explicitly from the prior art, i.e. has an inventive step. The practice of operating integrating pneumatic amplifiers indicates that the proposed solution has industrial utility.

 The drawing shows an integrating pneumatic amplifier.

It contains a housing 22, a control pressure chamber 25, three membranes 3, 20 and 23, fixed on the periphery with the housing 22 and connected in the center by a rod 4. Between the membranes 20 and 23 there is an outlet pressure chamber 5. In the static pressure chamber 1, communicating with the atmosphere, a control pressure spring 2 is installed in the chamber 25 with a control element (not shown in the drawing). In the chamber of the output pressure 5, two two-armed arms are installed, spring-loaded with springs 13 and 17, levers rotating on the axes 8 and 16, fixed in the housing 22. On the stem 4 there are pushers 6 and 18, which interact with the shoulders 26 and 24 of the two-armed arms. On the other shoulders 7 and 12 of these levers, valves 9 and 13 are placed, interacting with saddles 10 and 14, communicating with pneumatic channels 11 and 15 with inputs P ₁ and P ₂ . The submembrane chamber 21 is connected by a channel 27 with a control pressure chamber 25.

 The amplifier operates as follows.

The spring 2 tasks set the required value of the adjusting pressure P _adjust. at the facility, in particular, it may be the outlet pressure of the pilot regulator. If the input P _{1 is} connected to a pressure that is greater than the maximum adjusting output pressure, and the input P ₂ is a pressure that is less than the minimum adjusting output pressure, then the integrating pneumatic amplifier operates in inverse mode. With a decrease in the control pressure P _in relative to the tuning pressure in the chamber 25, the reference spring moves the membranes with the rod down, and the pusher 6 turns the shoulders 7 and 23 of the two shoulders of the lever clockwise on the axis 8, opening the valve 9 with a seat 9 with a pressure of P ₁ . With a constant gap between the valve 9 and the seat 10, the pressure in the chamber of the output pressure 5 will increase over time.

When the pilot pressure P increases _Rin in the chamber 25 on the adjusting diaphragm 3 through the rod 4, moving upwards, the plunger 18 turns the arms 12 and 24 of a two-armed lever in the clockwise direction on the axle 16 by opening the valve seat 14, 13 with the pressure P _2. With a constant gap between the seat 14 and valve 13, the pressure in the outlet pressure chamber 5 will decrease over time.

If you swap the pressure P ₁ and P ₂ , then the integrating pneumatic amplifier will be non-inverting, and with an increase in the input pressure P _{in, the} output pressure P _out in the chamber 5 will also increase, and vice versa. So, if the output pressure P _o in the chamber 5 acts on both membranes 23 and 20 in opposite directions, then its change will not change the force from the task spring 2, and therefore, the accuracy of the amplifier increases.

 Thus, in the integrating amplifier, the accuracy of maintaining the output pressure is improved by eliminating its effect on the control control pressure.

Claims (1)

 An integrating pneumatic booster comprising a housing, chambers of static, control, and output pressures, two membranes mounted peripherally with the housing, between which a control pressure chamber is located, a task spring with a control element connected to the first membrane and placed in a static chamber, a spring-loaded two-arm lever, installed in the outlet pressure chamber on a first axis fixed in the housing, one arm of which contains a first valve connected to the first seat, communicating the outlet pressure chamber with the first input of the pneumatic booster, and the other shoulder is connected to the stem, and the second valve with a seat, characterized in that a third membrane with a sub-membrane chamber and a second spring-loaded two-arm lever rotating on a second axis fixed in the housing are introduced into the outlet pressure chamber, the second seat communicating with the second input of the pneumatic amplifier, is fixed in the housing and connected to the second valve, mounted on one of the shoulders of the second spring-loaded two-shouldered lever, the membranes are fixed to each other by a rod connected with two-shouldered levers and interacting with them in antiphase, and the control pressure chamber is in communication with the submembrane chamber.