SU1474611A1 - Pressure ratio controller - Google Patents

Abstract

This invention relates to automatic regulation and can be used in pneumatic systems for various purposes. The purpose of the invention is to improve the accuracy of the pressure ratio controller. The regulator includes a housing 1 with an input 2 and an output 3 cavities between which a double-seat valve is located, the valves 4 are each interconnected and connected to the two-arm double lever 5, the shoulders of which are rigidly connected by an axis 6 installed in the bulkhead 7 of the housing, and the lever 5 is connected to the first 8 and second 9 membranes and the double-seat valve, and the membranes 8 and 9 form with the body, respectively, the cavities 10 (command) and 11 (working) pressures. 3 il.

Description

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The invention relates to the field of automatic regulation and can be used in pneumatic systems for various purposes.

The purpose of the invention is to improve the accuracy of the pressure ratio controller.

Figures 1 and 3 show the pressure ratio regulator, connection options: figure 2 - section aa in fig.t.

The regulator includes a housing 1 with an input 2 and an output .3 cavity, a two-week valve, the valves 4 of which are interconnected and connected to the two-arm double lever 5, the shoulders of which are rigidly connected by an axis 6 installed in the bulkhead 7 of the housing, with: a lever 5 is associated with the first 8 and second 9 membranes, which form with the body, respectively, the cavity 10 command and T1 working pressure

The cavity tt of the working pressure can be connected via a choke divider 12 (Fig. 1) to the output cavity 3 or connected to the regulator input before the hydraulic resistance 13 (Fig. 3).

The regulator operates as follows.

When the regulator is turned on according to the scheme of Fig. 1, the membrane 8 is acted upon by the command pressure Рко / и, and the membrane 9 - by the pressure Рreg, which is equal to the pressure behind the choke divider 12.

In the steady state, the forces acting on the lever 5 from the side of the membranes 8 and 9 are balanced.

The outlet pressure is taken from the gas pipeline network supplying combustible gas to the furnace, and may not be constant. The outlet pressure is supplied to the burners and through the throttle valve 12 to cavity 11, and the command pressure is taken from the pipeline supplying the blast air to the burners, and this pressure is also variable and depends on the thermal performance of the burner. If a

CO / I

and

the predetermined pressure ratio P Reg is violated, for example, by changing the command pressure, then the lever 5 rotates, increasing or decreasing the flow sections between the closures 4 and the seats of the double-seat valve, as a result of which

12

the pressure is changed until the preset pressure ratio is established again.

When the regulator is operated according to the scheme of FIG. 3, the membrane 8 is affected by the back pressure PKom, and the membrane 9 is affected by two pressures: P ,, and P2, taken using impulse tubes before and after flow resistance 13.

In the steady state, the lever 5 is in the equilibrium position corresponding to a predetermined ratio of the pressures Pc and the differential LP on the resistance 13. The input pressure is taken from the gas pipeline network supplying the combustible gas to the furnace. Adjustable gas outlet pressure is applied to the burners, command pressure is taken from the pipeline supplying the blast air to the burners.

If the given pressure ratio is Rkom and & P is broken, for example by changing the command pressure, then the lever 5 is rotated, changing the flow areas between the valves 4 and the seats of the double-seat valve, until the predetermined ratio of magnitudes and LR is restored.

When reducing or increasing the pressure drop across the hydraulic resistance 13 due to a change in the applied pressure, the specified

ratio of P values

COLA

and P resur

Claims (1)

similarly. Invention Formula A pressure ratio regulator, comprising a housing with inlet and outlet cavities, between which a two-seat valve is located, as well as first and second diaphragms placed in the housing and forming with it, respectively, command and working pressure cavities, characterized in that regulator, it contains an articulated double-arm lever, the shoulders of which are rigidly connected by an axis mounted in the partition wall of the housing with the possibility of rotation of the axis, the articulated double-arm lever being connected to the first and second membranes and control valve. J oGo04 X G2 adherence to b-to conpo Fig.Z