KR101685196B1 - Device for multistage quantitative opening and closing of the ball valve - Google Patents

Abstract

The present invention relates to a device for quantitatively opening and closing a ball valve in multiple stages. The device for quantitatively opening and closing a ball valve in multiple stages comprises: a valve body having a flow passage in which a fluid flows; a connection pipe fixed on both horizontal sides of the valve body and connected to a pipe; a valve stem provided with a handle and installed to be rotated in a direction perpendicular to the flow passage of the valve body; a ball connected to one end of the valve stem to open and close the flow passage of the valve body; a stem support pipe mounted on the valve body to support the valve stem; a ball inserted into the stem support pipe to be exposed to an upper surface; a handle having a plurality of grooves formed on a bottom surface coming in contact with the upper surface of the stem support pipe in a circumferential direction to accommodate the ball; and an elastic member to press the ball to expose the ball inserted into the stem support pipe to an upper portion to insert the ball into an insertion groove of the handle. Steam and a fluid supplied by a power plant, a boiler, and other industrial facilities can be quantitatively supplied.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-

The present invention relates to a multi-stage constant volume opening / closing valve, and more particularly, to a multi-stage constant volume opening / closing valve which is capable of supplying a predetermined amount of steam or fluid in a plurality of stages in a ball valve installed in an industrial facility including a power plant turbine and a boiler, To a metering opening / closing apparatus.

Valves are an essential component in systems that require opening and closing of passageways to control the passage or stopping of fluids, and these valves vary in the type and form of fluid flow and control.

As industrial technology develops and becomes more sophisticated, various types of fluids to be used or controlled are required. In addition to industrial safety, there is a need for means for controlling high-energy fluids such as high-temperature and high-pressure fluids. And a valve having a valve opening.

In addition, the structure of the valve gradually develops, so that the automatic control concept such as the solenoid or the actuator is introduced to drive the valve, so that it is precisely controlled. In addition to the actuator, the internal structure of the valve is improved to control the fluid precisely and finely Is required.

As described above, various kinds of micro flow rate control valves have been developed and used so that a constant flow rate can be supplied in a constant amount. One example is presented in Korean Patent No. 10-1576523. Wherein the micro flow rate control valve comprises a valve body having a fluid supply hole and a fluid discharge hole formed therein, a control hole communicating a fluid supply hole and a fluid discharge hole in the valve body, A control valve connected to a lower end of the valve stem to open and close the control hole and an actuator connected to an upper portion of the valve stem to move the valve stem in the upward and downward directions, Wherein the control hole is formed in a longitudinal direction between an operation hole and a fluid supply hole which are formed so that a valve seat can be operated while being connected to a fluid discharge hole, and is coupled to a control hole at a lower end of the valve stem, And a control pin connected to the control hole and a control pin coupled to the control hole, a control hole, and a control pin, So that the flow rate can be finely controlled by the resistance against the incense.

The fine flow rate control valve is a kind of needle valve, and the control pin serves as a needle in the needle valve.

Needle valves are suitable for small adjustments while reducing the flow rate when the flow rate is low or high. Therefore, it is not possible to supply the predetermined flow rate in the stepwise flow rate supply such as pre-warming, chest warming, and turbine rolling like the turbine system of the power plant.

Unlike the needle valve described above, a ball valve is formed by integrally forming a valve stem with a handle fixed and rotatably mounted on the valve body to open and close the flow path of the valve body.

An example of the above-mentioned ball valve is disclosed in Korean Patent Publication No. 10-2014-0002317.

Wherein the ball valve includes a valve body, a cap fixed to both right and left sides of the valve body, a valve stem installed in a direction perpendicular to the flow path of the valve body, a ball connected to one end of the valve stem, A seat ring that makes surface contact with the ball, and sealing means for preventing leakage of the fluid.

Such a ball valve allows the handle to be manually rotated within a range of about 90 degrees and gradually opens and closes the flow path formed in the valve body by the valve stem and ball interlocked with the handle as the handle rotates, The flow of the fluid can be opened or closed.

Generally, steam turbines installed in thermal power plants consist of high-pressure turbines and low-pressure turbines. The steam flowing into the high pressure turbine and the low pressure turbine and the steam discharged through the turbine are controlled by the turbine governor control system equipment.

Here, the turbine governor control system facility consists of various types of turbine valves that regulate the pressure and flow of the steam.

During operation of the turbine, or during shutdown, the various system valves are opened and closed by manual operation of the operator, if necessary. By operating the turbine valve, the pressure and the flow rate of the steam can be controlled to control the rotational speed load of the steam turbine. In this case, the control of the pressure and the flow of the steam must be controlled at a constant pressure and flow rate according to the load of the turbine.

First of all, the valve that is opened or closed by the automatic control valve system including the solenoid or the needle valve has a disadvantage in that the facility cost is relatively high and the maintenance cost is large, and the control of the flow rate is continuously performed, Not only is it not suitable for controlling the flow rate, but also results in an excessive investment for this purpose.

 In the case of a ball valve, it is difficult to precisely control the flow rate due to manual operation, and there is a problem in that it is not possible to control the multi-stage flow rate which is determined constantly.

KR 10-1576523 B1 (Dec. 04, 2015) KR 10-2014-0002317 A (2014. 01. 08.)

The present invention is intended to provide a multi-stage constant volume open / close ball valve capable of supplying a predetermined amount of pressure and flow rate of steam supplied from a ball valve installed in an industrial facility including a turbine and a boiler of a power plant.

For example, the present invention provides a method for controlling the pressure and flow rate of a steam flowing into a high-pressure turbine and a low-pressure turbine in a power plant turbine system and a steam discharged through the turbine, , The pressure and the flow rate of the steam supplied quantitatively are determined in a multistage manner, so that a certain amount of steam can be supplied.

Technical features of the present invention include: a valve body for quantitatively supplying steam or fluid in a turbine, a boiler, and an industrial plant of a power plant, the valve body comprising a flow path through which fluid flows, A valve stem installed to be rotatable in a direction perpendicular to the flow path of the valve body, and an opening / closing ball connected to one end of the valve stem for opening and closing the flow path of the valve body, A stem support tube supporting the valve stem; A ball inserted into the stem support tube and exposed to the upper surface; A handle having a plurality of grooves circumferentially formed on a bottom surface of the stem supporting tube so as to be able to receive the ball; And an elastic member pressing the ball so that the ball inserted into the stem supporting tube is exposed upward to be inserted into the insertion groove of the handle.

Further, the present invention is characterized by further comprising a release preventing device for preventing rotation of the stem support pipe threaded to the valve body.

The release preventing device is characterized in that the stopper, which is supported by the upper surface of the valve body and the side surface of the stem supporting tube, is fastened to the valve body with a fastener such as a set screw.

Further, in the present invention, a horizontal flange having an area corresponding to the stem support tube is formed at a portion where the valve stem is coupled to the handle, and the plurality of recesses are formed in the flange.

Further, a coating material selected from engineering plastics or synthetic polymer plastics is coated on the bottom surface of the flange and the surface of the concave groove.

Further, the present invention is characterized in that a numerical value indicative of a flow rate to the associated grooves is formed at each position where a plurality of grooves is formed in the flange.

In addition, the present invention is characterized in that both sides parallel to the direction in which the flow path is formed in the valve body are formed in a vertical plane so as to be fixedly installed on an unspecified wall, and a fixing hole penetrating the vertical plane is formed.

In the present invention, the ball inserted into the stem supporting tube is always exposed to the outside of the upper surface of the stem supporting tube by the elastic member, and the handle coupled to the upper end of the valve stem is positioned at the bottom of the stem supporting tube And presses the ball while pressing the elastic member while coming into contact with the upper surface. When the handle is rotated, the ball is inserted into the concave groove due to elasticity accumulated in the elastic member when the ball and the concave groove of the handle coincide with each other, so that the rotation of the handle can be temporarily stopped.

In this state, the handle is not rotated unless a rotational force capable of compressing the elastic member is applied to the handle, so that the valve can be kept in the closed state and the open state continuously.

The handle can be stopped by selectively inserting the ball into the groove formed in the circumference by turning the handle with a force enough to compress the elastic member when closing the valve or changing the flow rate.

Accordingly, the opening / closing ball for opening / closing the valve body at the end of the valve stem rotating together with the handle can control the opening / closing degree of the flow path, so that the set flow rate can be constantly supplied according to the rotated position of the handle will be.

At this time, the flow rate at the corresponding position can be recognized while viewing the numerical value display unit formed on the flange upper surface.

According to the present invention, when the handle is rotated, the ball can be opened and closed step by step according to the position where the ball is inserted into the concave groove of the handle, so that the predetermined flow rate can be supplied to each step. Thus, in order to drive and control the turbine in the power plant turbine system, The pressure and the flow rate of the steam flowing into the low pressure turbine and the steam discharged through the turbine can be adjusted according to the load of the turbine so that the turbine system can be safely operated.

It can be used to perform specific purposes by supplying the fluid in a multistage and constant amount throughout the industrial facilities including the boiler.

1 is a perspective view of the present invention.
2 is an exploded perspective view of the present invention.
3 is a sectional view of the present invention.
4 is a perspective view showing a part of the present invention.
Fig. 5 is an enlarged view of part A of Fig. 3; Fig.
6 is a plan view showing a valve closed state in the present invention.
7 is a plan view showing a state in which a valve is opened in the present invention.
8 is an enlarged view of a portion B in Fig. 3;

The features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

Prior to describing the embodiments of the present invention, the present invention is applied to ball valves used in power plants, boilers, and industrial facilities in general. In the embodiment described below, in order to drive and control a turbine in a power plant turbine system, A ball valve for supplying steam and a fluid in a quantitative manner will be described as an example.

Hereinafter, embodiments of the present invention will be described.

Fig. 1 is a perspective view of the present invention, Fig. 2 is an exploded perspective view of the present invention, and Fig. 3 is a sectional view of the present invention.

The multi-stage constant volume opening and closing ball valve of the power plant turbine system according to the embodiment of the present invention includes a valve body 10, an opening and closing ball 20, a valve stem 30, a stem supporting pipe 40, (50), a flow rate adjusting device (60), and a release preventing device (70).

The valve body 10 is formed with an inlet 100 and an outlet 101 forming a flow path coaxially and has a through hole 102 for installing a valve stem 30 from a central portion of the flow path to an upper portion thereof And the opening / closing ball 20 is positioned at the center of the flow path from the upper portion of the through hole 102.

In the valve body 10, a continuous flow path is formed horizontally, and an opening / closing ball 20 for blocking the flow path is disposed. The valve body 10 is vertically passed through the through hole 102 A valve stem 30 fixed to the opening and closing ball 20 is formed.

The outer shape of the valve body 10 has a rectangular shape. The front surface and the rear surface of the valve body 10 are formed in parallel with the flow path forming direction. The valve body 10 has a fixing hole (not shown) penetrating the front surface and the rear surface from both sides of the through hole 102 85, 85a are perforated.

The fixing holes 85 and 85a allow the valve body 10 to be fixed to an unspecified wall by using separate fasteners.

The connecting pipes 80 and 80a are respectively connected to the inlet and the outlet of the flow channel and between the connecting pipes 80 and 80a and the opening and closing ball 20, The sheets 81 and 81a are arranged.

Screws are formed on the inner circumferential surface of the inlet 100 and the outlet 101 and the outer circumferential surface of the connecting pipe 80 and 80a so that the valve body 10 and the connecting pipes 80 and 80a are screw- A separate connection pipe is coupled to the connection pipe (80, 80a) to form a flow path.

The coupling tubes 80 and 80a may be coupled to the valve body 10 in addition to being screwed to the valve body 10, or may have a structure in which a bolt and a nut are coupled with each other by forming a flange.

The sheets 81 and 81a are formed to be in contact with both sides of the opening and closing ball 20 and include a first seat carrier 82 and a second seat carrier 82a which are closely contacted to the opening and closing ball 20 .

The first and second seat carriers 82 and 82a are preferably configured to be self-relieving so that the first seat carrier 80 is capable of self- And the second sheet carrier 82a is formed on the outlet side 101 of the flow path.

The first and second sheet carriers 82 and 82a which are subjected to the self-decompression are pushed out in the flow direction of the fluid when the pressure of the cavity 83 is increased in the case of the first sheet carrier 82, The second sheet carrier 82a installed in the direction of the outlet of the fluid flows downward to press the opening and closing ball 20 so that no leakage occurs between the contact surface with the opening and closing ball 20. [

The first and second sheet carriers 82 and 82a may be formed of any one material selected from polytetrafluoroethylene resin PTFE, TEFRON, ethylene propylene rubber EPDM and acrylonitrile butadiene rubber NBR .

In the through hole 102, a packing 84 for mounting a valve stem 30 and a stem supporting tube 40 are coupled.

The packing 84 is inserted into the through hole 102 along the axial direction of the valve stem 30 after being inserted into the through hole 102 of the valve stem 30, Contacts the first and second sheet carriers 82 and 82a, and the upper portion contacts the stem support tube 40. [

The opening and closing ball 20 is integrally fixed to the lower portion of the valve stem 30 and is rotatably disposed at the center of the flow path inside the valve body 10, It is possible to open and close the flow path while forming a flow path connecting the outlet 101 and the outlet 101 horizontally.

The valve stem 30 is formed of a metal seal, the lower portion thereof is fixed to the opening / closing ball 20, and the upper portion thereof is coupled to the handle 50 and the spline 300.

The valve stem 30 is supported in a vertical direction to the packing 84 and the stem support tube 40 and can be opened or closed by selectively controlling the flow rate regulator 60 through the handle 50 Let's do it.

The stem support tube 40 is composed of an upper stem support tube 400 and a lower stem support tube 410 to configure the flow rate regulator 60.

A shaft hole 401 through which the valve stem 30 passes is formed at the center of the upper stem support pipe 400. An insertion hole 402 extending coaxially with the shaft hole 401 is formed at a lower portion of the shaft hole 401 So that the lower stem support tube 410 can be inserted.

The lower stem support pipe 410 is formed with a screw hole 404 to which the set screw 403 is coupled from the outer circumferential surface of the main body of the upper stem support pipe 400 to be inserted into the insertion hole 402, As shown in Fig.

A through hole (406) penetrating through the upper surface in a vertical direction from a bottom surface contacting the lower stem support pipe (410) is formed at one side of the insertion hole (402) to constitute the flow rate regulating device (60).

A shaft hole 411 through which the valve stem 30 penetrates is formed at the center of the lower stem support pipe 410. The shaft hole 411 is extended and protruded upward to be inserted into the insertion hole of the upper stem support pipe 400 And a threaded portion 413 for engaging with the valve body 10 is formed in a lower portion thereof.

The upper stem support tube 400 and the lower stem support tube 410 are formed such that a flow rate regulating device 60 is formed on the upper stem support tube 400 and then the annular protrusion 412 is connected to the upper stem support tube 400 And the set screw 403 is fastened to the screw hole 404 so that the set screw 403 is brought into close contact with the outer circumferential surface of the annular protruding portion 412, .

A flange 500 constituting a flow rate regulating device 60 is formed on the handle 50 together with the upper stem support pipe 400 to be coupled with the valve stem 30 and the spline 300, So that the degree of opening and closing of the flow path of the opening and closing ball 20 can be adjusted.

5, the flow rate regulator 60 includes a ball 600 inserted into the through hole 406 of the upper stem support tube 400 and exposed to the upper surface thereof, A plurality of recessed grooves 501 formed in the bottom surface of the flange 500 in contact with the upper surface of the upper stem support tube 400 in the circumferential direction so as to contact the upper stem support tube 400, The elastic member 610 inserted into the concave groove 501 of the handle 50 and the elastic member 610 fixed to the through hole 406 so that the elastic member can press the ball 600, And a screw 620.

The ball 600 is made of steel of a perfectly spherical shape, and preferably one of coatings selected from engineering plastics or synthetic polymer plastics can be coated in consideration of abrasion resistance.

The through hole 406 of the upper stem support tube 400 into which the ball 600 is inserted is formed as an inner circumferential surface having a diameter larger than the diameter of the ball 600. The ball 600 inserted into the through hole 406, The upper stem support pipe 400 is formed with a space smaller than the diameter of the ball 600 so that the upper stem support pipe 400 is exposed to the upper portion of the upper stem support pipe 400, A curved surface portion 405 which makes a rolling contact is formed.

4, the grooves 501 are formed at the bottom surface of the flange 500 at appropriate intervals in the circumferential direction with respect to the center of rotation of the handle 50 at positions corresponding to the balls 600.

The bottom surface of the flange 500 and the surface of the concave groove 501 are coated with a coating material selected from engineering plastics or synthetic polymer plastics and the elastic member 610 is made of a compression coil spring.

6 and 7, a stepwise numerical value display unit 502 is formed on the upper surface of the flange 500 to measure a flow rate of the flow of the flow of the air in accordance with the degree of opening / On the upper surface of the body 10, an indicating mark 503 serving as an opening / closing reference is formed.

2, 3, and 6, a screw hole 700 is formed on an upper surface of the valve body 10, and an upper surface of the valve body 10 And the stopper 710 which is in contact with the side surface of the lower stem support tube 410 is formed with a screw hole 711 coinciding with the screw hole 700 so that the set screw 720 is screwed into the screw holes 700 and 711 So that the stopper 710 fixed to the valve body 10 supports the lower stem support pipe 410 so as not to move so as to prevent the screw from being loosened.

In the present invention constructed as described above, the fluid of the turbine system of the power plant is discharged to the valve body 10, the opening and closing ball 20 and the other connecting pipe 80a through the connecting pipe 80 on one side, The flow rate of the fluid is adjusted according to the degree of opening / closing of the flow path of the opening / closing ball 20 by turning the flow path 50.

Referring to FIGS. 3 and 6, the state illustrated in this figure is a state in which the opening and closing ball 20 blocks the flow path in the valve body 10. At this time, the ball 600 is exposed to the upper portion of the through hole 406 by the elasticity of the elastic member 610, and the numerical value " 0 " of the numerical value display unit 502 formed on the flange 500 is And the ball 600 is inserted into one fitting groove 501 formed on the bottom surface of the flange 500 where the numerical value " 0 " is formed.

The numerical value " 0 " of the numerical value display unit 502 is aligned with the indicating mark 503 in a state in which the handle 5 is in parallel with the flow path forming direction, and this position indicates that the supply of the flow rate is stopped You will know.

7, when the handle 50 is rotated, the valve stem 30 coupled to the handle 50 by the spline 500 is rotated, and the opening / closing ball (not shown) coupled to the lower end of the valve stem 30 20 can control the degree of opening and closing of the flow path.

At this time, when the handle 50 is rotated, the flange 500 rotates so that the concave groove 501 in which the ball 600 is inserted is released from the ball 600, and the ball 600 is inserted into the flange 500 So that the elastic member 610 is compressed while being inserted into the through hole 406. When the flange 500 continues to rotate, the ball 600 compressing the elastic member 610 is pressed against the elastic member 610 when the recessed groove 501 close to the circumference is positioned on the indicating mark 502 610 are inserted into the recesses located in the indicia 502.

As the handle 50 rotates, the opening and closing degree of the opening and closing ball 20 can be controlled in a stepwise manner as the ball 600 is stopped each time the ball 600 is inserted into the plurality of concave grooves 501, .

The stem support tube 40 which is subjected to the rotational friction of the flange 500 as the handle 50 is operated is fastened to the valve body 10 by the set screw 720 and contacts the lower stem support tube 410 The fastening force of the lower stem supporting tube 410 screwed to the valve body 10 is not released.

The present invention has been described with reference to preferred embodiments thereof.

The embodiments described in the present specification and the configurations shown in the drawings relate to the most preferred embodiment of the present invention and are not intended to represent all of the technical ideas of the present invention and thus various equivalents, Examples should be understood.

Therefore, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. There may be embodiments in which various modifications and changes are possible.

10: Valve body 20: Opening and closing ball
30: valve stem 40: stem support tube
50: Handle 60: Flow control device
70: release preventing device 80, 80a: connection pipe
81, 81a: sheets 82, 82a: sheet carrier
83: Cavity 84: Packing
85, 85a: Fixing hole 100: Entrance
101: outlet 300: spline
400: upper stem support tube 401:
402: insertion hole 403: set screw
406: through hole 410: lower stem support tube
411: shaft hole 412: annular protrusion
413: Screw part 500: Flange
501: grooved groove 502: numerical value display section
503: Indication marker 600: Ball
610: elastic member 620: set screw
710: Stopper 711:
720: Set screw

Claims (5)

A ball valve for supplying steam and fluid by gradually opening and closing a flow path formed in a valve body by a valve stem and a ball interlocked with a handle by rotating a handle so as to open or close the flow of steam or fluid,
A valve body in which a fluid flow path is formed;
A valve stem having a handle and installed to be rotatable in a direction perpendicular to the flow path of the valve body;
An opening / closing ball connected to one end of the valve stem to open / close a flow path of the valve body;
A stem support tube coupled to the valve body to support the valve stem;
A handle including a flange having a plurality of grooves formed in a circumferential direction on a bottom surface that is in contact with an upper surface of the stem support tube so as to receive the ball;
A release preventing device installed on an upper surface of the valve body and a side surface of the stem supporting tube; And
A flow rate adjusting device for adjusting the opening and closing degree of the opening / closing ball so as to be adjusted;
, ≪ / RTI &
Wherein the valve body comprises:
A fixing hole passing through the vertical surface is formed on both sides parallel to the direction in which the flow path is formed, and an indication mark indicating opening / closing reference is formed on the upper surface, The flow rate of the water supplied from the water supply source can be recognized,
The stem support tube includes:
The valve stem is fixed to the valve body by a set screw so that it can not be rotated by the stopper in contact with the lower stem support tube. And the upper stem support tube and the lower stem support tube are configured to constitute the flow rate adjusting device,
The through hole of the upper stem supporting tube into which the ball is inserted is formed to have an inner peripheral surface having a diameter larger than the diameter of the ball. The ball inserted into the through hole is not released to the outside while being exposed to the upper portion of the upper stem supporting tube Wherein the upper stem support tube is formed with a curved surface portion that makes a rolling contact with the ball so that a space smaller than the diameter of the ball is formed,
The flange
And the valve stem is coupled with the valve stem by a spline so as to rotate the valve stem,
The bottom surface of the flange and the surface of the concave groove are coated with a coating material selected from engineering plastics or synthetic polymer plastics to prevent wear, and the upper surface of the flange has a plurality of concave grooves A numerical value display unit is formed to indicate a flow rate to the corresponding groove,
Wherein the release preventing device comprises:
A stopper is abutted on the upper surface of the valve body and the side surface of the lower stem support pipe and a screw hole is formed on the upper surface of the valve body to prevent the stopper from being loosened when the stopper is fixed to the valve body by the set screw A stopper fixed to the valve body supports the lower stem support pipe so as not to move so as to prevent the screw from being loosened,
Wherein the flow rate regulating device comprises:
A ball which is made of steel of a perfect sphere body and is inserted into the stem supporting pipe which is connected to the valve body and supports the valve stem and is exposed to the upper surface, A plurality of concave grooves formed in the bottom surface of the flange to be contacted in a circumferential direction; an elastic member having the ball inserted into the upper stem support tube exposed upward to be inserted into the concave groove of the handle; And a set screw which is fastened to the through hole so that the set screw can be pressed,
The bottom surface of the handle flange coupled to the upper end of the valve stem is brought into contact with the upper surface of the stem support tube so that the elastic member presses the ball and the handle rotates so that when the balls and the grooves of the handle coincide, The ball is inserted into the concave groove due to the accumulated elasticity so that the rotation of the handle can be temporarily stopped,
The handle does not rotate unless a rotational force capable of compressing the elastic member is applied to the handle, so that the valve can be kept in the closed state and the open state continuously,
When the handle is rotated with a force enough to compress the elastic member when the valve is closed or the flow rate is to be changed, the ball can be selectively inserted into the groove formed in the circumferential surface to stop the handle, Wherein the opening and closing ball for opening and closing the valve body at the end of the valve stem that rotates together can control the degree of opening and closing of the flow path so that the set flow rate is constantly supplied in accordance with the rotated position of the handle. Quantity switchgear.
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