SU1432471A1 - Pressure regulator - Google Patents

Abstract

The invention relates to automation, in particular, to pressure regulators of liquid and gaseous working media, and can be used in hydro-pneumatic systems of automatic pressure control of the working fluid. The purpose of the invention is to increase the accuracy of the regulator. The pressure regulator includes a housing .1, an inlet 2 and an outlet 3 cavity, a wall 4, a saddle 5, a locking member 6, a rod 7, an axial channel 8, radial grooves 9, a partition 10, a chamber 11, a bellows sensing element - a bellows 12, a movable base 13 of the bellows, pusher 14i fixed base 15 of the bellows, the setting element - screw 16, stepped hole 17, cavity 18, cavity 19 and flexible tubing 20. 1 Il.

Description

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 The invention relates to automation, in particular to pressure regulators for liquid and gaseous working media, and can be used in

Hydropneumatic automatic pressure control of the working body

The purpose of the invention is to improve the accuracy of the controller

The drawing shows the design of the pressure regulator I The pressure regulator includes a housing 1 with inlet 2 and outlet 3 lanes divided by wall 4 with saddle), shut-off member 6 with stem 7c

(|) with the sevaya channel 8 and the radial grooves 1JI 9, mounted in the partition 10 of the output cavity 3 from samera 11, there is a syphonic sensing element - the background 12, the movable base 13 of which is connected through the pusher 14 with a current of 7, and a fixed base And with a setting element - vinrom 16.

i The rod 7 is made stepwise, and the partition wall is equipped with a counter rod I step hole 17, while the rod 7 is installed in the hole p, and the radial grooves 9 communicate the axial hole 8 and the cavities 18 formed by the outer surface of the rod 7 and the inner surface - | gi 17, with the cavity 19 of the bellows J-2 communicated flexible tubes 20

output cavity 3 of the housing 1; The pressure regulator works as follows;

j When the working fluid flows through the body, the 1 degree of opening of the 6 organ is set as a result of the total force of the rod 7 °. The pressure of the working body on the locking body 6 from the inlet cavity 2 acts on the bottom and the resultant pressure ciin in the outlet cavity 3, from the pressure of the bellows 12, the cavity 19 of which is connected by flexible tubes 20 to the outlet cavity 3, and the pressure in

cavity 18, communicated by the axial channel 8 and the radial grooves 9 with the input cavity 2.

The action of forces on the rod 7 opis-aet- with the equation

+ D S

G. f, P ,,

1-0

where F ;, is the area of the locking body 6; P, is the pressure in the inlet cavity 2;

f is the coefficient of elastic forces of the silicone 12;

dS is the strain value of the bellows 12; F - lower active area

the base of the bellows 12; Pj is the pressure in the output band 3;

f.- total area of the stepped gatok 7 depending

on the degree of discovery stu stupeio

The constant values of this equation are F,, F,, f, and P,.

The balance of the operating forces is established as a result of the vice versa 1

VIA variables P, uS and 2

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depending on P - pressure in the inlet cavity 2. This equilibrium is achieved by adjusting the hydraulic parameters of the pressure regulator. By adjusting the pressure regulator, it is possible to provide a constant pressure P in the outlet cavity 3 of the housing 1.

Constant pressure in the output cavity 3 is provided by an automatic balancing of the forces acting on the step rod 7. For example, if the pressure PI is established in the regulator when the step rod 7 is in the upper position at which the pressure P through the axial channel 8 extends only the area of the upper stage of the stepped rod 7, when the pressure P is increased, the force on the stepped rod 7 from the top downwards through the axial hole 8 increases simultaneously and the force on the bellows 12 increases; ION R. reaction force on the stepped shaft 7 is usshtie bottom by increasing the pressure

Since the previous equilibrium was at the same value P, the pressure P increases (the equilibrium of the stepped rod 7 is disturbed. In this case, the force on the stepped rod 7 increases from the top, as with the full opening of the locking member 6. The pressure difference between P and P decreases to minimum that follows from

the hydraulic characteristics of the valve body 6, and the effective area of the bellows 12 is significantly larger than the area of the valve body 6 ". As a result, the stepped segment 7 is lowered and the resistance in the valve body 6 is increased, which ensures that the pressure P o

Thus, the pressure increase P lowers the stepped rod 7 with the connection of the following steps, therefore, the controller maintains a constant pressure Pij,

With decreasing pressure P, the process of maintaining pressure P is neglected in the reverse order.

Claims (1)

Invention Formula A pressure regulator, comprising a housing, between the inlet and outlet cavities of which a saddle is fitted, in which the closure member is installed. Q 0 associated with the movable base of the bellows sensitive element through the rod and the pusher, located in the opening of the partition mounted between the output cavity and the chamber in which the syphonic sensitive element is located, and the setting element, which is In order to increase the accuracy of the regulator, the stem is staggered, is installed in the counter stem of the stepped opening of the partition and is equipped with an axial channel and radial grooves on the rod end and in steps of the stem and the holes, connected by the relation fixed base of the bellows is fixed to the sensor tuning element and its cavity is connected with the outlet cavity flexible tubes.