SU706833A1 - Pressure regulator - Google Patents

Description

(54) ADJUSTING PRESS.

, : one .

- The invention relates to full automatic automation and can be used in

gas supply systems.

A gas reducer 1 is known, containing an additional pneumatic valve formed by piston steps. The said cavity is said to or. it is separated from the output pole through a valve device, which only works at the beginning (setup process) and at the end of the operating cycle, -

The disadvantage of the reducer is that there is no correction of the output depending on. gas consumption

.in limited control accuracy .... .... ;;

Izvestiya rear reducer 2 s; The inlet and outlet channels in the case of which between the sensing element and the Stem acting on the valve are placed a pneumatic actuator, the working cavity of which is connected by channels in the game with the cavity of the intake located behind the saddle and the channel with the output cavity.

The disadvantage of this gearbox is that there is relatively low accuracy, due to this. nonlinear characteristic effort. At low cost ,.

 gain is small, at high cost. .-gain, great:.

The purpose of the invention is to improve the control accuracy in the range of costs.

The goal is achieved by the fact that the pressure regulator, comprising a housing with an inlet and outlet cavities and a differential piston located between the sensor element, the ohm and the regulator, is connected to the first and second bands. 5 but with a cavity cavity and output capacity of a valve device, made in the form of a spring-loaded profiled element and installed in a caylo between the first and 20 second cavities of the differential piston ...

The proposed pressure regulator is schematically shown in the drawing.

The pressure regulator has a housing 1 25. With an input 2 and an output 3 cavities, an adjusting member 4, opening or closing the saddle 5 under the influence of a spring 6 or an adjusting spring 7, transmitting force to the 30 adjusting member through the sensing element 8, the pusher 9, the differential piston 10,

The first 11 and second 12 cavities of the differential piston are connected by a channel 13 and are connected respectively to the cavity of the intake 14 and the output cavity 3. In the channel 13 of the differential piston 10 between the cavities 11 and 12 a valve device is installed in the form of a spring-loaded profiled element 15, which can be made a pair of valve - saddle.

The pressure regulator works as follows. .

That from the power source gets into the input cavity 2. When the adjusting spring 7 is unloaded, the regulator 4 is pressed against the saddle 5, while the cavities 2 and 3 are hermetically disconnected,.

When loading the adjusting spring 7, the force of the spring through the sensitive element 8, the pusher 9, differential; the actuating piston 10 is transmitted. on regulation authority 4. The regulator valve. depress from seat 5, and gas through the annular gap formed to K enters the strip; the intake 14 and into the output cavity 3. At the same time, the gas from the cavity of the intake 14 through the channel enters the first cavity 11, creating an additional force aimed at squeezing the shutter .., ...

From the output cavity 3, the gas flows under the sensitive element 8. When a balance of forces arises from pressure and springs acting on the regulator and the sensitive element, a certain pressure is established at the output of the regulator. - ..

With increasing gas extraction from the regulator, pressure drops in the outlet cavity 3, and, due to

This is the release of the shutter of the regulating body 4 from the seat 5. The gas flow through the cylinder increases, the pressure in the cavity of the intake 14 and in the cavity D1 of the differential piston 10 increases with the dynamical component of the gas flow. In this case, an additional force arises, squeezing the shutter of the regulator 4. The pressure in the outlet cavity 3 increases, increasing the accuracy of the output pressure.

However, at low costs and un-. The channel section 13 is dynamically corrected in the cavity of the intake 14 and the working cavity, and is insignificant, which does not allow sufficiently increasing the accuracy of the regulator. At high flow rates, the pressure in the intake cavity increases significantly, which introduces an excess correction and degrades the accuracy of the regulator. The nonlinearity of the correction of the output pressure at a constant channel cross section is due to.

nonlinear, quadratic dependence of the additional pressure in the intake cavity on the gas flow rate through the main seat.

lr-filiGf Zil e g

where p is the flux density;

 K - coefficient of proportional flow rate and gas flow rate o through the saddle;

Q gas flow through the saddle; V is the flow rate. Since the first cavity of the differential piston is a flow 5 cavity, the pressure in it can be adjusted by changing the output section. In the proposed controller, the output section is changed; automatically, due to the displacement of the differential porous 10 with a frame of 13 relative to the profiled element. 15. As the gas flow rate changes, i.e. as the movable system of the regulator moves, the output section is adjusted so that the pressure in the cavity 11 of the differential piston 10 takes the value corresponding to the required adjustment of the output pressure. So at low flow rates (small displacements of the movable system of the regulator) channel

that 15. As the gas flow rate changes, i.e. As the pivot system of the regulator moves, the code section is set so that.

The pressure in the VOLUME 11 of the differential piston 10 assumed the value corresponding to the required adjustment of the output pressure. So, at small expenses (small movements

the moving system of the controller), the channel .13 is blocked by a profiled element to a large extent, and at high flow rates the channel 13 overlap is smaller,. . .

 Thus, the installation of a valve assembly and TV in the channel of the differential piston q with an automatically changing section provides an increase in the accuracy of the regulator. .

 The use of the invention will allow for more accurate pressure control in pneumatic systems or simplify the design of precise and conventional controllers, reducing their cost by about 30%.

Claims (2)

1. USSR author's certificate number 444908, cl. G 05 D 16/06, 1972. 2. USSR author's certificate No. 504038, cl. G .05 D 16/10, 1974 (prototype).