RU2722889C2 - Gas reducer - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to control pipeline valves, mainly to gas reducers intended for adjustment of gas pressure at low pressure lines. Gas reducer comprises a prefabricated body, a support with a sealing insert, a tubular structure valve made in the form of a hollow cylinder, combined with a command piston, arranged to reciprocate, contact end of valve of tubular structure with closed gas reducer thrusts against sealing insert of support. Gas reducer is additionally equipped with a check valve arranged at the output of the reducing device, which acts as a safety device, an operating reduction gear installed before the reducing device, and a discharge valve installed after the reducing device. Reducer is connected to reset valve by means of tube, so that it is possible to control discharge valve by means of command pressure supply.

EFFECT: result is reduction of control force, simplified design of gas reducer.

1 cl, 1 dwg

Description

The invention relates to control valves, mainly to gas reducers designed to regulate the gas pressure on the low pressure lines, but is not limited to these lines and can be used for the gas environment in the gas industry, chemical industry, etc. The technical result of the invention is to reduce the control effort and simplify the design of the gas gear.

Known gas reducer by ed. St. No. 192575, characterized in that, in order to improve the accuracy and reliability of the regulator, a ring of elastic material is installed in it between the tubular valve and the sensing element (USSR patent No. 694842 “Gas reducer” IPC G05D 16/06, G05D 16/10 , published on 10/30/1979).

The disadvantage of this device is the instability and unreliability of work, the need for heating during operation.

Known gas reducer containing a sensing element made in the form of a membrane, a control cavity containing an adjustment spring, an actuator containing a pneumatically unloaded valve, pressed by an auxiliary spring to the seat, separating the cavity of high and medium pressure with a radial seal, characterized in that the sealing surface is pneumatically the unloaded valve is made conical, and the sealing surface of the seat is made in the form of a rounded edge formed by a cylindrical hole on the flat end of the seat. The gas gear according to claim 1, characterized in that the valve is made of all-metal, and the seat is made of polymeric material. A gas reducer according to claim 1, characterized in that the control cavity contains a handwheel on which a spindle is mounted connected to the support of the adjustment spring by a threaded connection with the possibility of reciprocating (patent for invention of the Russian Federation No. 72936 "Gas Reducer" IPC B63C 11/32, G05D 16/06, B63C 11/20, published 05/10/2008)

The disadvantage of this device is the great effort of control, setting to pre-installation mode, the need for heating during operation, a complex design.

Known gas reducer containing a membrane connected to the locking plate, the main positive feedback in the form of two shoulders, one of the shoulders of which are connected with the locking plate, negative feedback in the form of a compression spring, additional positive feedback in the form of two identical tension springs, equipped a movable support connected to two shoulders levers, the contact surface of which is made profiled. When the spring support changes its position under the influence of the medium, the levers rotate around the axes, while the arms of the levers, which are acted upon by the springs, change their length, which changes the force of action of these springs on the spring (RF patent No. 2132509 “Gas Reducer” IPC F16K 31/12, G05D 16/06, published on 06/27/1999).

The disadvantage of these designs is the great control effort and design complexity.

A controller is known having a prefabricated housing divided by a rubber membrane into a control part with a main spring and a working part with a seat and valve, which interacts with the main spring through the membrane. High pressure gas is supplied to the valve, and low pressure gas, acting on the membrane, is discharged to the consumer. Regulation of the gas pressure at the outlet is carried out by the interaction of gas through the membrane to the main spring (DF Gurevich "Calculation and design of pipe fittings", M., 1964, Leningrad, "Engineering", S. 205, Fig. 127).

The disadvantage of this device is the great control effort, setting to pre-installation mode, the need for heating during operation.

Also known is a pressure-reducing valve with a piston actuator and an internal pulse mechanism (DF Gurevich "Calculation and design of pipeline valves", M., 1964, Leningrad, "Mechanical Engineering", p. 205, Fig. 128).

The disadvantage of this device is the great control effort, setting to pre-installation mode, the need for heating during operation and the complexity of the design.

Also known is a spring reducer, tuned to a specific mode of operation, consisting of a piston, a stem and a poppet valve, structurally interconnected (MV Dobrovolsky "Liquid rocket engines", M .: 1968, "Engineering", p. 352 , Fig. 9.13).

The disadvantage of this device is the great control effort. Limited operation mode, customizable during manufacture.

There are known designs of gearboxes with a poppet valve controlled through the stem by a command medium and a spring acting on the valve to hold the gearbox in the closed position (N.A. Kiselev. Boiler installations. - Higher school, M., 1975, p. 210, fig. . 136).

The disadvantage of these designs is the great control effort and design complexity.

The closest to the claimed technical solution for the combination of essential features and purpose is the patent according to the invention of the Russian Federation No. 2344461 "Reducer", IPC G05D 16/00, published on 01.20.2009. The essence of the known technical solution is a gearbox, comprising a prefabricated housing, a valve, a command piston, providing the possibility of reciprocating movement of the valve, the contact end of which, when the gearbox is closed, is rested against the sealing insert of the support, characterized in that the valve is made tubular in the form of a hollow cylinder at the same time as the command a piston, which is made in the form of a glass having a protrusion in the bottom part.

The disadvantages of this technical solution are:

- the absence of a safety device that would be triggered when an uncontrolled excess of command pressure is greater than the set value (uncontrolled excess of command pressure is greater than the set value, which leads to the complete opening of the valve, as a result of which the outlet pressure will be higher than the required one, which, as a result, can lead to emergency in systems);

- design complexity, as the design contains a large number of mating parts;

- low manufacturability of the assembly;

- low maintainability;

- low reliability in operation;

- high cost.

The claimed technical solution is aimed at eliminating the disadvantages of the prototype, namely:

- elimination of the possibility of uncontrolled exceeding of command pressure greater than a predetermined value;

- simplification of the design;

- improving the manufacturability of the assembly;

- increase in maintainability;

- increased reliability;

- cost reduction.

The essence of the claimed technical solution is a gas reducer, comprising a prefabricated housing, a support with a sealing insert, a tubular valve made in the form of a hollow cylinder, combined with a command piston, installed with the possibility of reciprocating movement, the contact end of the valve of the tubular design with the gas reducer closed rested against the sealing insert of the support is characterized by the fact that the gas reducer is additionally equipped with a check valve located at the outlet of the reducing device, performing the function of a safety device, a command reducer installed before the reducing device and a relief valve installed after the reducing device, while the command reducer is connected to a relief valve by means of a tube, with the possibility of controlling the relief valve by means of a command pressure supply.

The claimed technical solution is illustrated in Fig., Which shows a General view of a gas reducer in longitudinal section.

The gas reducer consists of the following structural elements:

- prefabricated building 1;

- command gear 2;

- relief valve 3;

- valve tubular design, made in the form of a hollow cylinder, combined with the command piston 4;

- support 5;

- fitting 6, 7 and 10;

- check valve 8;

- stuffing box seals 9.1-9.3.

It is assembled as follows: a prefabricated housing 1, inside of which a tubular valve (not shown in Fig. Pos. Not shown) is installed with the possibility of reciprocating movement, made in the form of a hollow cylinder, combined with a command piston 4 (the valve of the tubular structure is made of a smaller diameter in comparison with a command piston and is located to the left of it, see Fig., and together they represent a single structural element). The valve of the tubular design has a contact end, which abuts against the sealing insert of the support 5, in case the gearbox is closed, i.e. in the absence of team pressure. The command piston of the valve 4 is made in the form of a glass with a protrusion in the bottom part and has three working surfaces, which are affected by the corresponding pressure:

- pressure of the command medium (Pk) created by the command gear 2 and flowing through the pipe through the nozzle 10 to the surface 4.1 of the piston 4 (when the set pressure of the command pressure is exceeded, the check valve 8 acts as a safety device, which relieves the excess pressure into the space by exit from the reducing device, which will protect the system from an emergency);

- pressure of the reduced medium (Rv) - on the surface 4.2;

- pressure of the medium taken from the inlet side (Pin = Pu) and coming from the nozzle 6 through the tube to the nozzle 7 - to the surface 4.3.

The command gear 2 is mounted on the prefabricated housing 1 to the reducing device, which is part of the gas gear mechanism, which includes the support 5 and the tubular valve made in the form of a hollow cylinder, combined with the command piston 4. The packing 9.1 separates the command pressure cavities (Pk ) and a manager (Ru) on the command piston 4. Stuffing box seals 9.2 and 9.3 of the same design, separate the pressure cavities (Pk) from the inlet (Pbx) and the control (Ru) from the output (Pv). When the pressure at the outlet is exceeded, the relief valve 3 is activated, installed after the reducing device, connected to the control gear 2 by means of a tube, with the possibility of controlling the relief valve by means of command pressure.

Gas gear works as follows. The reduction (lowering of pressure) of the working medium takes place in the area of the valve end face of the tubular structure made in the form of a hollow cylinder combined with the command piston 4 and the end face of the support 5 with the gearbox open, the opening of which is carried out by applying command pressure (P _to ) to surface 4.1. The command pressure is created using the command gear 2, which is transmitted through the pipe through the nozzle 10. When the command pressure is uncontrolled, the check valve 8 acts as a safety device.

The working medium flows through the space in the support 5, passes through the reduction zone, then through the valve of the tubular structure, made in the form of a hollow cylinder, combined with the command piston 4 to the pipeline outlet from the gas reducer.

Command medium must balance the force from the pressure bleed from the input (P _in) to the surface 4.3 and the working medium pressure reducing device after (F _a) on the surface of 4.2. The dynamic balance of all forces ensures reduction in the required mode.

The pressure (P _y ) is created by taking the gas with the help of the nozzle 6 installed on the collection case 1 to the reducing device, then the selected gas passes through the tube to the nozzle 7 and enters the surface 4.3.

The gas reducer closes from the pressure force (P _y ) to the surface 4.3, as soon as the command medium (P _k ) is removed from the corresponding cavity of the command piston. The working environment will be cut off.

When the pressure at the outlet is exceeded, the relief valve 3 is activated, installed after the reducing device, connected to the control gear 2 by means of a tube, with the possibility of controlling the relief valve by means of command pressure.

Based on the foregoing, the claimed technical solution provides the opportunity to implement the tasks, namely:

- high safety of the gearbox is ensured due to the installation of a check valve at the outlet of the reducing device;

- simplified design by combining several structural elements into one;

- Improved manufacturability of the assembly also by combining several structural elements into one;

- improved maintainability also by combining several structural elements into one;

- increased reliability in operation by installing a check valve and combining several structural elements into one;

- the cost is also reduced by combining several structural elements into one.

The claimed technical solution meets the criterion of novelty for inventions, because from the investigated prior art there are no technical solutions with the claimed combination of features.

The claimed technical solution meets the criterion of inventive step for inventions, because it is not obvious to the specialist, as a result, it provides the opportunity to implement the tasks that are implemented due to, on the one hand, simplifying the design while ensuring reliability and maintainability, which is not obvious to the specialist.

The claimed technical solution meets the criterion of industrial applicability, because can be manufactured on standard equipment using well-known materials and technologies.

Claims (1)

A gas reducer, comprising a prefabricated housing, a support with a sealing insert, a tubular valve made in the form of a hollow cylinder, combined with a command piston, mounted with the possibility of reciprocating movement, the contact end face of the valve of a tubular design with the gas reducer closed is abutted in the sealing insert of the support characterized in that the gas reducer is additionally equipped with a check valve located at the outlet of the reducing device, performing the function of a safety device, a command reducer installed before the reducing device, and a relief valve installed after the reducing device, while the command reducer is connected to the relief valve by tube, with the ability to control the relief valve, carried out by applying command pressure.

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