RU2681513C9 - Pressure regulator amplifier - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: gas pressure regulator amplifier comprises a housing, a lid with a pulse gas supply nozzle, a mono-valve with pull-back spring, a fixed seat, a movable seat, measuring piston with rod, command pressure cavity in communication with the command pressure channel, feedback pressure cavity, a control spring. Measuring piston rod is made movable relative to the measuring piston with a ledge for contact with this piston and is equipped with an additional feedback piston located in a sleeve coaxially placed in the amplifier body. Additional piston and sleeve form a cavity, communicated through radial and axial drilling in a movable rod or with a command pressure cavity through central drilling in a mono-valve, or with a feedback pressure cavity through a slit gap between a mono-valve and a movable seat, made in movable rod and having a flat shape. Rod is loaded with a control spring through the additional piston and the ball. In addition to the central drilling, the mono-valve has two radially spaced drillings: the first for communicating with the command pressure cavity and the second through the groove on the mono-valve with the impulse gas supply cavity through the gap between the fixed and left saddle of the mono-valve, the right flat end of which is in contact with the movable seat.

EFFECT: quality of regulation is improving.

3 cl, 3 dwg

Description

The invention relates to the field of control valves and relates to an integral part of the gas pressure regulator - amplifier.

A command device is known that includes a diaphragm with a driver spring and a stem that forms the seat of a spherical valve, which is a waste valve, which is connected to a second spherical valve, which is a working valve, while the cavity between the valves is command, and the cavity behind the waste valve is through a central section in the stem reported with the cavity to the left of the membrane and which is the feedback cavity (RF patent for useful model No. 155506 IPC G01L 7/00, 10/07/2014).

The disadvantage of the device with a good tightness of the valves is to increase the idle stroke of the valves and as a result, an increase in the insensitivity of the amplifier.

Known regulator-amplifier paired, containing two cylindrical body with cavities input, command and output pressure, valve-piston, piston-rod, dual valve, seat, pressure device (RF patent for useful model №147597, IPC G05D 16/00, 10.11 .2014).

The disadvantage of this device is the lack of sensitivity with alternating loads.

Known amplifier gas pressure regulator, comprising a housing, a sensitive element in the form of two membranes, between which is placed a regulating body, including a rod rigidly fixed in the housing with a nozzle installed in it, interacting with the saddle mounted on the clamp, and the clamp is connected to the membranes using plates, discs and nuts (RF patent for utility model 171287, IPC G05D 16/06, 09/08/2016).

The disadvantage of this device is the possibility of oscillatory processes of the membrane assembly at the minimum gas flow rates through the gas pressure regulator.

Known pilot-regulator, working in conjunction with a pressure regulator, comprising a housing, a choke gas supply nozzle, a mono-valve with two conical surfaces, a movable seat supported on the second conical surface of the mono-valve, a measuring piston with a rod, a cavity of command pressure and feedback, while the input the stationary seat and the inlet section of the rolling seat are made in the form of thin-walled cylindrical shells with the possibility of elastic deformation when in contact with a mono-valve (RF patent on the invention of 2010708, IPC G05D 16/00, 31.12.2015).

The disadvantage of this device, taken as a prototype, and the listed analogs is the poor quality of regulation in transient operating modes, especially in case of disturbances in low gas flow modes through the gas pressure regulator.

The technical result, the achievement of which the invention is directed, is to improve the quality of regulation, as well as to ensure good adaptability in the assembly-disassembly and adjustment of the amplifier gas pressure regulator.

The technical result is achieved by the fact that in the gas pressure regulator amplifier, comprising a housing, a lid with a pulse gas supply nozzle, a spring-loaded mono-valve, a saddle stationary, a movable saddle, a measuring piston with a rod, a command pressure cavity communicated with the command pressure channel, a pressure cavity feedback, the spring setting, new is that the piston rod of the measuring is made movable relative to the piston measuring with a ledge for contact with this piston and is provided with an additional pore It has a feedback positioned in the sleeve coaxially placed in the amplifier body, while the additional piston and the sleeve form a cavity communicated through radial and axial drilling in the movable rod or to the command pressure cavity through the central drilling in the feedback pressure through a slit gap between a monoclap and a saddle movable, movable in the rod and having a flat shape, with the rod through the additional piston and ball loaded with a spring defining; In addition to the central drilling, a mono-valve has two radially spaced drills: the first for communicating with the command pressure chamber and the second through a groove on a mono-valve with a pulsed gas supply cavity through the gap between the stationary seat and the left end of the mono valve, whose right flat end is in contact with the movable seat.

Also, a fixed protrusion is made in the saddle around the circumference of the central drilling, and a sealing gasket made of a durable, wear-resistant elastic material, for example, Adiprene, is embedded in the left end of the mono-valve.

The mono valve is also made of stainless steel, and the rod is made of bronze.

FIG. 1 shows a structural diagram of an amplifier for a gas pressure regulator (hereinafter referred to as an amplifier), FIG. 2 is a diagram of the operating valve; in FIG. 3 - diagram of the waste valve.

The amplifier includes a housing 1, a cover 2 with a fitting 3 for supplying a pulse gas. The cover 2 fixes the support 4 with the spring 5 of the mono valve 6 placed in the seat of the stationary 7. This left part of the mono valve 6 with the seat of the stationary 7 forms the operating valve “P” (Fig. 2)

The piston rod 8 of the measuring piston 9 is placed on the same axis as the monoclap 7. The rod 8 is made movable relative to the measuring piston 9 and has a step 10 for contact with this piston. The rod 8 contains an additional feedback piston 11 placed in a fixed sleeve 12, which is coaxially mounted in the housing 1 of the amplifier. The piston 11 and the sleeve 12 form a cavity 13. This cavity can be communicated through the radial 14 and axial drilling 15 in the movable rod 8 or with the command pressure cavity 16 through the central hole 17 in the mono valve 6, or with the feedback pressure cavity 18 through the slit gap 19 between the mono valve 6 and the movable saddle 20, which is made in the stem of the movable 8 and having a flat shape. This right side of the mono valve 6 and the movable seat 20 form a waste valve "C" (Fig. 3). The movable rod 8 through the additional feedback piston 11, the ball 21 and the support 22 is loaded with a spring defining 23. Screw 24 serves to adjust the pressure level behind the gas pressure regulator.

In addition to central drilling 17, a mono valve 6 has two radially spaced drillings: drilling 25 communicates with a command pressure chamber 16, which communicates with a command pressure supply channel 26 to the gas pressure regulator, and drilling 27, which communicates through a groove 28 in a mono valve 6 with a pulse supply cavity gas 29 through the slit 30 between the fixed seat 7 and the left end 31 of the mono valve 6 (Fig. 2). The right end 32 of the monoclap 6 is in contact with the movable seat 20.

The operating valve "P" must be sealed to eliminate the possibility of spontaneous activation of the pressure regulator. To do this, a gasket 33 made of durable, wear-resistant elastic material, for example Adiprene, is embedded in the left end of a monoclap 6, and a protrusion 34 is made on the plane of the seat 7 fixed around the hole (drilling 15). In the waste valve “C” the mono valve 6 is made of stainless steel, and the movable seat 20 in the composition of the rod 8 is made of bronze to ensure a good fit. However, according to its function in the waste valve “C”, complete tightness is not required, since the presence of leakage through this valve is compensated for by pressure feedback after the pressure regulator.

The amplifier gas pressure regulator works as follows. On the equilibrium modes in the cavity of the command pressure 16 and, accordingly, through the channel 26 in the executive body of the pressure regulator (not shown conventionally) a fixed pressure is established, determined by the position of the working “P” and waste “C” valves. In turn, this position is determined by the forces from the spring specifying 23, the pressure in the feedback cavity 18 and the return spring 5, and the pressure in cavity 13. This fixed pressure determines the corresponding preset level of regulated pressure downstream of the gas pressure regulator.

The presence of insignificant permissible leaks on the waste valve “C” in equilibrium modes will cause a decrease in pressure in the executive body of the pressure regulator and, as a result, a decrease in pressure behind the gas pressure regulator, to which the measuring piston 9 reacts, which, under the action of the spring specifies 23 through bearing 22, the ball 4 and an additional feedback piston 11 will displace the mono valve 6 to the left to open the operating valve “P” to restore the preset initial pressure level downstream of the pressure regulator. As the leakage on the waste valve “C” develops, the cycles described above will be repeated, maintaining the desired pressure mode downstream of the pressure regulator.

In transient conditions (change in network load after pressure regulator — change in gas flow rate and pressure), additional feedback on pressure downstream of the operating valve “P” serves to improve the quality of control (reducing overpressure downstream of the gas pressure regulator and eliminating the possibility of self-oscillations).

For example, when the pressure in the network is downstream of the gas pressure regulator, the pressure feedback signal behind the pressure regulator passes into the feedback pressure cavity 18 as a decrease in pressure. As a result, under the action of the spring defining 23, the rod 8 through the mono valve 6 opens the working valve “P”, simultaneously closing the valve of the waste “C” and connecting the cavity 13 through the central drilling 15 in the saddle of the movable 20 and drilling 17 in the mono valve 6 with the supply of command pressure for operating valve "P". The opening of the operating valve "P" increases the command pressure on the executive body of the pressure regulator. Simultaneously, under the action of pressure in the cavity 13, the piston of the additional feedback 11 will shift to the right and after it the mono valve 6 will shift to the right under the action of the spring 5, covering the working valve “P” and reducing the command pressure. This eliminates the possibility of overshooting and the occurrence of self-oscillations.

When the pressure in the feedback cavity 18 rises, all processes proceed in the reverse order.

Thus, the proposed implementation of the amplifier gas pressure regulator improves the quality of its regulation. In addition, its manufacturability and ease of maintenance has been improved, for example, by reducing the requirements for precision manufacturing of the waste valve “C”.

Claims (3)

1. The amplifier gas pressure regulator, comprising a housing, a cover with a nozzle supply of pulsed gas, a mono valve with a return spring, a saddle stationary, a movable saddle, a piston measuring with a rod, a command pressure cavity in communication with the command pressure channel, a feedback pressure cavity, a spring specifying , characterized in that the measuring piston rod is made movable relative to the measuring piston with a ledge for contact with this piston and is equipped with an additional feedback piston located in the sleeve coaxially placed in the amplifier body, while the additional piston and sleeve form a cavity communicated through radial and axial drilling in a movable rod or with a command pressure cavity through a central drilling in a mono valve, or with a feedback pressure cavity through a slot gap between the mono valve and the moving seat made in the rod movable and having a flat shape, and the rod through the additional piston and the ball is loaded with a spring specifies; In addition to the central drilling, a mono-valve has two radially spaced drillings: the first for communicating with the command pressure chamber and the second through a groove on a mono-valve with a pulsed gas supply cavity through the gap between the stationary seat and the left end of the mono valve, the right flat end of which is in contact with the movable seat. 2. The device according to claim 1, characterized in that the fixed seat has a protrusion around the circumference of the central drilling, and a gasket made of durable, wear-resistant elastic material, for example, Adiprene, is embedded in the left end of a mono valve. 3. The device of claim 1, characterized in that the mono-valve is made of stainless steel, and the movable seat is made of bronze.

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