Flow control valve

Abstract

The invention relates to a flow control valve, comprising a brake machine and a housing with a control element, the control element is provided with an inlet nozzle and an outlet nozzle, the central part between the nozzles is coaxial with the nozzles, and radial and longitudinal throttling elements are distributed on the inner cylindrical surface of the central part; the cross section of each protrusion is in a triangular tooth shape, and the movable throttling element is located between the protrusions and used for changing the size of the through hole in the center portion so as to make translational motion in the radial direction of the side wall of the fixed throttling element and make contact with the fixed throttling element. The terminal parts of all the throttling elements are in a triangular wedge shape, the vertex angle is 360 / n, n is the number of the movable throttling elements, and the inner diameter of the central part of the control element is as follows: n is greater than or equal to 2 under the condition of considering the cross sectional area of the throttling elements when the control valve is in the'open 'position; any cross-sectional area of the specified central portion deviates from the cross-sectional area of the flow portion of any one of the nozzles by no more than 2%.

Description

Technical Field

[0001] The invention relates to a device for adjusting flow parameters of a working medium, and can be used for equipment in natural gas, petroleum, chemical, energy, metallurgy and coal industries. Background Art

[0002] In terms of a set of basic features, the closest to the claimed invention is the known (RU 2682468, IPCF16K3 / 03, F16K 31 / 54, published on February 02, 2019) flow control valve (hereinafter referred to as regulator), which comprises a brake mechanism, a housing with a control element, the control element having inlet and outlet nozzles with through holes and movable and fixed control teeth (throttling elements), wherein the control teeth are located on the outside of the fluid; all control teeth are streamlined, with wedge-shaped ends, and the size of the cross-sectional angle is defined as 360 / n, where n is the number of movable control teeth, and the channel cross-section of the regulator is symmetrical, in the shape of a multi-faceted star, and gradually tapers toward the center during the flow blocking process.

[0003] Since the arrangement of the throttling element leads to a partial taper of the fluid, it is not possible to achieve the following technical result in the known invention. During the movement of the medium in any control mode (including in the "open" position), the cross-sectional area of ​​the flow changes, resulting in a change in its characteristics, even if this is not necessary at the time. This leads to a reduction in the flow characteristics of the regulator. Summary of the invention

[0004] The objective (technical problem) that the present invention aims to solve is to reduce the cost of pumping water.

[0005] The technical result obtained by implementing the present invention is to achieve the best flow velocity characteristics of the medium.

[0006] The above technical effect can be achieved because there is such a flow control valve, which includes a brake mechanism and a shell with a control element, the control element is provided with an inlet nozzle and an outlet nozzle, the nozzles are provided with through holes of the same diameter, there is a coaxial central part between the nozzles, and radial and longitudinal throttling elements are evenly distributed on the inner cylindrical surface of the central part: the fixed throttling element is in the shape of a convexity, and the cross section of each convexity is in the shape of a triangular tooth, and the movable throttling element is located between them, and its function is to change the size of the through hole in the central part to achieve radial (at the arrival / departure) along the side wall (apex surface) of the fixed throttling element The control element is movable (in the direction of the longitudinal axis of the opening control element) and in contact with it; the terminal parts of all throttling elements are triangular wedges with a vertex angle of 360 / n, where n is the number of movable throttling elements, and when the regulator is in the "open" position, the cross-section of the through hole in the central part of the control element is a symmetrical multi-faceted star; the inner diameter of the central part of the control element is larger than the inner diameter of any nozzle, and its size is: taking into account the cross-sectional area of ​​the throttling element when the regulator is in the "open" position, the deviation of any cross-sectional area of ​​the designated central part from the cross-sectional area of ​​the flow part of any nozzle does not exceed 2%.

[0007] Due to the radial displacement of the movable throttling element between the regulator "open" and "closed" positions, the size of the through-hole in the central part of the control element changes, thus adjusting the flow value.

[0008] In the "open" position of the regulator, the cross section of the through hole in the central part of the control element is limited by the vertex surface of the throttling element (the surface with the wedge-shaped vertex). During the adjustment of the flow value, the movable throttling element moves from the initial position (the "open" position of the regulator) until its vertex surface is completely closed on the longitudinal axis of the control element and its side faces are in full contact with the vertex surface of the fixed throttling element in the central part of the control element (the "closed" position of the regulator).

[0009] As the inner diameter of the control element increases, the volume of the central part of the control element also increases, thereby compensating for the volume occupied by the throttling element in this part. Due to this compensation, when the regulator is in the "open" position, the cross-sectional area of ​​the through hole at any point in the entire control area (the central part of the control element) remains unchanged or has a slight (within 2%) deviation. At the same time, the changes in the through hole shape and cross-sectional area have the same or very similar characteristics, which optimizes the characteristics of the medium flow through the regulator in the "open" position and the medium flow in the pipeline. In other words, in the open state, the flow of the regulator is equal to the flow of the pipeline in which the regulator is installed (or the difference does not exceed 2%).

[0010] These changes in the through-holes, characterized by the flow coefficient, allow the medium flow to maintain exactly the same characteristics (flow and velocity) both upstream and downstream of the control element. Since the specific characteristics of the medium flow do not change in the regulator's "open" position, pumping costs can be reduced several times.

[0011] Depending on the brakes used, the regulator can be either a control or anti-surge design.

[0012] This device is the only control device that fully complies with the "axisymmetric" standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To illustrate the essence of the present invention, the following drawings are provided:

[0014] Figure 1 is a longitudinal section through the regulator housing with the through hole of the flow component in the "open" position of the regulator;

[0015] Figure 2 It is a BB section view of the center part of the regulator, with the through hole of the flow component in the "open" position of the regulator;

[0016] Figure 3 is a longitudinal section through the center of the regulator, with the through hole of the flow component in the "closed" position of the regulator;

[0017] Figure 4 is a cross-section AA of the center section of the regulator, with the through hole of the flow section in the "closed" position of the regulator. DETAILED DESCRIPTION

[0018] In order to demonstrate the industrial implementation of the present invention, the specific design of the flow control valve and its working mode are now introduced.

[0019] The flow control valve comprises a stopper (not shown) and a housing with a control element 6, the inlet and outlet nozzles of which (3 and 4, respectively) have the same diameter D. In the central portion 5 of the control element 6, six radial and longitudinal throttling elements (control teeth) are evenly arranged: fixed throttling elements 2, each of which has a triangular tooth in cross section, formed in the form of a projection on the inner cylindrical surface of the central portion 5 of the control element 6; and movable throttling elements 1 located between them. All throttling elements 1 and 2 are streamlined, with wedge-shaped ends and a 120° cross-sectional vertex angle.

[0020] When the cross section of the through hole of the central part 5 of the control element 6 is symmetrical and the number of edges is even, the regulator is in the "open" position ( Figure 2 ).

[0021] When the apex surfaces of the active throttling element 1 are closed to each other on the longitudinal axis of the control element 6, the regulator is in the "closed" position ( Figure 3 , Figure 4 ).

[0022] The inner diameter D1 of the central portion 5 of the control element 6 is increased by a certain amount compared to the inner diameter D of the regulator nozzle 3, when the regulator is in the "open" position ( Figure 1 , 2 ), taking into account the cross-sectional areas of the throttling elements 1, 2, any cross-sectional area of ​​the central part 5 of the control element 6 is kept within + / - 2% of the cross-sectional area of ​​any flow portion of the nozzle 3 (4).

[0023] When the fixed throttling element 2 moves radially along the side wall (apex surface) 4 of the fixed throttling element 2 and contacts it, the size of the through hole 5 of the central part of the control element 6 changes, thereby adjusting the flow value. The translational movement of the movable throttling element 1 is achieved by rotating the wheel of the regulator push rod and transmitting this movement to the push rod disc through the gear system. Each movable throttling element 1 is meshed with the push rod disc through a matching rod.

Claims

1. A flow control valve, characterized in that: comprising an actuator and a housing having a control element having an inlet nozzle and an outlet nozzle having through openings of the same diameter and a central portion positioned between the nozzles coaxially with the through openings, wherein a radially oriented, longitudinally oriented throttling element is uniformly positioned on an inner cylindrical surface of the central portion thereof: A fixed throttling element—in the form of projections, each projection having a triangular tooth shape in cross section, a movable throttling element located between the projections, the movable throttling element being configured to change the size of the through opening of the central portion, the through opening being configured to enable radial translational movement along the side wall of the fixed throttling element and in contact therewith; wherein all throttling elements have an end portion in the form of a triangular wedge having a vertex angle dimension of 360 / n, wherein n is the number of movable throttling elements, the cross section of the through-opening of the central portion of the control element in the "open" position of the control valve having the shape of a symmetrical multi-sided star, The inner diameter of the central portion of the control element is larger than the inner diameter of any one nozzle and is sized so that any cross-sectional area of ​​the designated central portion does not deviate more than 2% from the cross-sectional area of ​​the flow portion of any one nozzle, taking into account the cross-sectional area of ​​the throttling element when the controller is in the "open" position.

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