RU2806943C1 - Flow control valve - Google Patents

Abstract

FIELD: working medium.

SUBSTANCE: devices for regulating the parameters of the flow of a working medium used in equipment for the gas, oil, chemical, energy, metallurgical and coal industries. The flow control valve contains a drive and a housing with a control element having inlet and outlet pipes of the same diameter. In the central part of the control element, radially directed, longitudinally oriented throttling elements are evenly located. The fixed throttling elements each have a triangular tooth shape in cross section, and they are made in the form of protrusions on the inner cylindrical surface of the central part of the control element. Between them there are movable throttling elements. All throttling elements have a streamlined shape and end in a wedge, the size of the vertex angle in the section is equal to 120°. In this case, the internal diameter of the central part of the regulating element is larger than the internal diameter of any of the nozzles by the amount at which the area of any cross-section of this central part, taking into account the cross-sectional area of the throttling elements in the “open” position of the regulator, has a deviation from the cross-sectional area of the flow part of any of the nozzles more than 2%.

EFFECT: achieving optimal flow characteristics of the medium.

1 cl, 4 dwg

Description

The invention relates to devices for regulating the parameters of the flow of a working medium and can be used in equipment for the gas, oil, chemical, energy, metallurgical and coal industries.

The closest in terms of the set of essential features to the claimed invention is a flow control valve (hereinafter referred to as the regulator), accepted as a prototype, containing a drive, a housing with a regulating an element having inlet and outlet pipes with passage holes and movable and stationary control teeth (throttle elements), while the control teeth are located along the outer part of the flow, all teeth are streamlined and end with a wedge, the size of the angle in the section is defined as 360/ n, where n is the number of movable teeth, the passage of the regulator is made symmetrical in cross section in the form of a multi-beam star with the possibility of narrowing towards the center in the process of blocking the flow.

Achieving the technical result indicated below in the known invention is impossible due to the narrowing of the flow path due to the placement of throttling elements. During the movement of the medium in any control mode, including in the “open” position, a change occurs in the cross-sectional area of the flow, which leads to a change in its characteristics even if this is not necessary at the moment. This leads to a decrease in the flow characteristics of the regulator.

The task (technical problem) to which the present invention is aimed is to reduce pumping costs.

The technical result achieved by implementing the claimed invention is to achieve optimal characteristics of the medium flow.

The specified technical result is achieved due to the fact that in a flow control valve containing a drive and a housing with a regulating element having inlet and outlet pipes with passage holes of the same diameter and a central part located between the pipes coaxial with them and evenly spaced radially on its inner cylindrical surface directional, longitudinally oriented throttling elements: fixed - in the form of protrusions, each having the shape of a triangular tooth in cross section, and movable throttling elements located between them, designed to change the size of the passage opening of the central part with the possibility of radial, in the direction towards/from the longitudinal axis a regulating element for translational movement along the side walls (vertical faces) of the fixed throttling elements, in contact with them; in this case, all throttling elements have an end part in the form of a triangular wedge with a vertex angle size of 360/n, where n is the number of movable throttling elements, the cross-section of the passage hole of the central part of the regulating element in the “open” position of the regulator, tapering towards the center in the process of blocking the flow, has the shape of a symmetrical multi-rayed star, and the internal diameter of the central part of the regulating element is greater than the internal diameter of any of the nozzles by the amount at which the area of any cross-section of the said central part, taking into account the cross-sectional area of the throttling elements in the “open” position of the regulator, has a deviation from the cross-sectional area of the flow part of any of the nozzles of no more than 2% .

Regulation of the flow value is carried out by changing the size of the passage opening of the central part of the regulating element due to the radial displacement of the movable throttling elements between the “open” and “closed” positions of the regulator.

The cross-section of the passage hole in the central part of the control element in the “open” position of the regulator is limited by the apical faces (faces at a wedge-shaped apex) of the throttling elements. In the process of regulating the flow value, the movable throttling elements are displaced from their initial position (the “open” position of the regulator) until their vertex faces are completely closed on the longitudinal axis of the regulating element and their lateral faces are in full contact with the vertex faces of the fixed throttling elements within the central part of the regulating element ( regulator position "closed").

Increasing the volume of the central part of the control element by increasing its internal diameter compensates for the volume occupied in this part by the throttling elements. As a result of such compensation, the cross-sectional area of the passage hole at any point along the entire control zone (the central part of the control element) in the “open” position of the regulator remains the same or has minor (within 2%) deviations. In this case, equal or very similar characteristics of changes in the shape and cross-sectional area of the passage hole are achieved, which leads to optimization of the movement of the medium flow through the regulator in the “open” position to the characteristics of the medium flow in the pipe. That is, in the open state, the throughput of the regulator is equal to (or differs by no more than 2%) the throughput of the pipeline on which the regulator is installed.

These changes in the passage opening, characterized by the throughput coefficient, allow the flow of the medium to remain exactly the same characteristics (volume and speed) both before and after the control element. Due to the absence of changes in the specified characteristics of the medium flow in the “open” position of the regulator, pumping costs are reduced several times.

Depending on the drive used, the regulator can be manufactured in both regulating and anti-surge versions.

The claimed device is the only control device that fully meets the “axisymmetric” criterion.

To explain the essence of the claimed invention, the following graphic materials are presented:

fig. 1 - longitudinal section of the regulator body, the passage hole of the flow part in the “open” position of the regulator;

fig. 2 - section B-B of the central part of the regulator, the passage opening of the flow part in the “open” position of the regulator;

fig. 3 - longitudinal section of the central part of the regulator, the passage hole of the flow part in the “closed” position of the regulator;

fig. 4 - section A-A of the central part of the regulating element, the passage opening of the flow part in the “closed” position of the regulator;

As evidence of the industrial implementation of the claimed invention, a description of the specific design of the flow control valve and the method of its operation is presented.

The flow control valve contains a drive (not shown) and a housing with a regulating element 6, having inlet 3 and outlet 3 pipes of the same diameter D. In the central part 5 of the regulating element 6, six radially directed longitudinally oriented throttling elements (regulating teeth) are evenly located: fixed 2 throttling elements, each having a triangular tooth shape in cross section, made in the form of protrusions on the inner cylindrical surface of the central part 5 of the control element 6; and movable 1 throttling elements located between them. All throttling elements 1 and 2 have a streamlined shape and end with a wedge, the size of the apex angle in the section is 120°.

The regulator is in the “open” position (Fig. 1,2), when the cross-section of the passage hole of the central part 5 of the control element 6 has the shape of a symmetrical multi-beam star with an even number of rays (Fig. 2).

The regulator is in the “closed” position (Fig. 3, 4) when closed the vertex faces of the movable 1 throttling elements with each other on the longitudinal axis of the control element 6.

The internal diameter D1 of the central part 5 of the regulating element 6 is increased in comparison with the internal diameter D of the branch pipes 3 of the regulator by the amount at which the area of any cross-section of the central part 5 of the regulating element 6, taking into account the cross-sectional area of the throttling elements 1, 2 in the "open" position of the regulator ( Fig. 1, 2) is maintained within +/- 2% of the cross-sectional area of the flow part of any 3 (4) of the nozzles.

Regulation of the flow value is carried out by changing the size of the passage hole in the central part 5 of the regulating element 6 as a result of the radial displacement of the fixed 2 throttling elements along and in contact with the side walls (vertical faces) of the 4 fixed 2 throttling elements, in the direction towards/from its longitudinal axis. The translational movement of the movable 1 throttling elements is ensured by the rotation of the regulator drive wheel and the transmission of this movement through a gear system to the drive disk, with which each of the movable 1 throttling elements is engaged through a counterplate.

Claims (1)

A flow control valve containing an actuator and a housing with a regulating element having inlet and outlet pipes with passage holes of the same diameter and a central part located between the pipes, coaxial with them, with radially directed, longitudinally oriented throttling elements evenly spaced on its inner cylindrical surface: fixed - in the form protrusions, each having the shape of a triangular tooth in cross section, and movable throttling elements located between them, designed to change the size of the passage opening of the central part of the regulating element with the possibility of translational movement radial towards/from the longitudinal axis of the regulating element along the side walls of the fixed throttling elements by contacting them; in this case, all throttling elements have an end part in the form of a triangular wedge with a vertex angle size of 360/n, where n is the number of movable throttling elements, and the cross-section of the passage hole of the central part of the regulating element in the “open” position of the regulator, tapering towards the center in the process of blocking the flow has the shape of a symmetrical multi-beam star, characterized in that the internal diameter of the central part of the regulating element is greater than the internal diameter of any of the nozzles by the amount at which the area of any cross-section of the said central part, taking into account the cross-sectional area of the throttling elements in the “open” position of the regulator, has a deviation from the cross-sectional area of the flow part of any of the nozzles of no more than 2% .