JP2004218786A - Butterfly valve provided with water filling function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a butterfly valve with water filling function capable of preventing peeling off of paint on a valve body and paint in a valve box due to direct attack of fluid being a jet stream when the fluid contains large amount of suspended substance under high pressure specifications. <P>SOLUTION: A pair of disc tail parts 14, 15 are provided on a rear surface side D of a valve element 6 in the direction of rotation when opening the valve element. Both disc tail parts 14, 15 are formed into a fan shape in the direction of rotation of the valve element 6 and are attached to a peripheral fringe part of the valve element 6. A water passing hole 16 opened on an outer peripheral face side and an inner peripheral face side is formed in the disc tail part 14 on one side which has an outer peripheral face like a spherical face coming into slide contact with a valve box seal ring 3 when the valve element 6 is opened to small extent E and is displaced toward an upstream side A in the direction of stream in accordance with rotation of the valve element 6 when opening the valve element. A protection guide plate 17 guiding the fluid flowing to a downstream side B through the water passing hole 16 from the upstream side A into the direction in which the fluid leaves the rear surface side D of the valve element 6 onto the downstream side B is provided in the valve element 6 by opposing to an opening part on the inner peripheral face side of the water passing hole 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a butterfly valve having a water filling function, and relates to a technique of a valve for supplying a fluid at a constant flow rate when filling a pipe with water.
[0002]
[Prior art]
Conventionally, as this type of butterfly valve, for example, as shown in FIG. 11, a valve body 43 for opening and closing a flow path 42 is rotatably provided in a valve box 41, and the valve body in a rotation direction C at the time of opening is opened. 43 is provided with a pair of disk tail portions 45 and 46 on the back side D of the same.
[0003]
The disk tail portions 45 and 46 are formed in a fan shape in the rotation direction of the valve body 43 and provided on the peripheral portion of the valve body 43, and slide on the inner peripheral surface of the valve box 41 when the valve body 43 is at a small opening degree. It has an outer peripheral surface that is spherically curved and in contact with it. Each of the disk tail portions 45 and 46 has a plurality of water passage holes 47 each having one end opened to the outer peripheral surface and the other end opened to the inner peripheral surface.
[0004]
According to this, by opening the valve body 43 by the small opening E, the fluid flows from the outer peripheral surface side of the one disk tail portion 45 displaced toward the upstream side A through the water passage hole 47 to the inner peripheral surface side. And flows from the inner peripheral surface side of the other disk tail portion 46 displaced toward the downstream side B to the outer peripheral surface side through the water passage hole 47. Thereby, at the time of initial filling or refilling, it is possible to fill the pipeline on the downstream side B with a small flow rate, thereby preventing a water hammer (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-7-208615
[Problems to be solved by the invention]
However, in the above-mentioned conventional type, in the case of a fluid containing a large amount of suspended matter such as agricultural water at a high pressure, when the valve body 43 is kept at a small opening E for a long period of time, the fluid becomes one disk. When flowing from the outer peripheral surface side of the tail portion 45 to the inner peripheral surface side through the water passage hole 47, it becomes a high-speed jet and the back side D of the valve body 43 (that is, the valve body in the rotation direction C at the time of opening). There is a problem that the paint on the back side D of the valve body 43 is peeled off by directly hitting the back side D) of the valve body 43.
[0007]
Further, when the fluid flows from the inner peripheral surface side of the other disk tail portion 46 to the outer peripheral surface side through the water passage hole 47, it becomes a high-speed jet and directly hits the inner peripheral surface of the valve box 41, and the valve There is a problem that the coating on the inner peripheral surface of the box 41 is peeled off.
[0008]
ADVANTAGE OF THE INVENTION This invention can prevent that the coating of a valve body or the coating in a valve box peels off by the direct hit of the fluid which became the jet when the fluid contains a large amount of suspended matter in a high-pressure specification. An object of the present invention is to provide a butterfly valve having a water filling function.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a valve box seal ring arranged in an annular shape along an inner peripheral surface in a valve box, and a valve box seal which is rotated around the axis of a valve rod to be fully closed. A butterfly valve having a valve body that is in sliding contact with a ring and a pair of disk tail portions attached to the back side of the valve body in the rotation direction at the time of opening, wherein the disk tail portion is fan-shaped in the valve body rotation direction. And has a spherically curved outer peripheral surface which is provided on the peripheral portion of the valve element and is in sliding contact with the valve box seal ring at a small opening degree of the valve element. In one of the disk tail portions displaced toward the upstream side in the flow direction, a water passage hole having one end opened to the outer peripheral surface side and the other end opened to the inner peripheral surface side is formed. Move the fluid flowing downstream through the valve from the back side of the valve body to the downstream side. Protection and guide member for guiding the direction, opposite to the inner peripheral surface side opening of the water flow hole, in which is provided on the valve body.
[0010]
According to this, when the valve body is set to a small opening degree, the fluid becomes a high-speed jet when flowing from the outer peripheral surface side of one of the disk tail portions to the inner peripheral surface side through the water holes. At this time, the jet is guided by the protection guide body in a direction away from the back side of the valve body (that is, the back side of the valve body in the rotation direction at the time of opening) to the downstream side. There is no direct hit. Therefore, it is possible to prevent the coating of the valve body from peeling off due to the direct impact of the jet.
[0011]
Furthermore, since there is no water hole in the other disk tail, the fluid is blocked by the other disk tail and the flow from the inner peripheral surface to the outer peripheral surface of the other disk tail is prevented. You. Thus, the jet of fluid does not hit the inner peripheral surface of the valve box through the other disk tail portion, and therefore, the coating of the inner peripheral surface of the valve box is prevented from peeling off due to the direct impact of the jet. Can be.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, reference numeral 1 denotes a butterfly valve, and a valve box 2 has an upstream pipe (not shown) and a downstream pipe (not shown) connected to ports (not shown) on both sides. I have.
[0013]
As shown in FIG. 3, in the valve box 2, a valve box seal ring 3 is arranged in an annular shape along the inner peripheral surface. An openable and closable valve element 6 that rotates about a rotation axis 5 orthogonal to a flow path axis 4 that passes through the valve box 2 is provided in the valve box 2 via a valve rod 7. The end of the valve rod 7 is linked to a drive device (not shown) such as a manual handle for rotating the valve rod 7 to open and close the valve element 6 and a motor with a speed reducer.
[0014]
As shown in FIGS. 3 to 6, the valve body 6 has a disk-shaped body 9 having a hollow inside, and a plate-shaped peripheral plate formed on the outer periphery of the body 9 and thinner than the body 9. And a unit 10. As shown by the solid line in FIG. 3, at the fully closed position S, the outer edge of the peripheral plate portion 10 slides on the valve box seal ring 3, so that the upstream side A and the downstream side B of the valve element 6 are watertight. Sealed. The valve stem 7 is inserted into a pair of cylindrical bosses 11 provided on the valve body 6 and integrally connected to each other, and is rotatably held by the valve box 2.
[0015]
A pair of disk tail portions 14 and 15 are provided on the back side D of the valve body 6 in the rotation direction C (opening direction) at the time of opening. Each of the disk tail portions 14 and 15 is formed in a fan shape in the rotation direction of the valve body 6, is attached to the outer peripheral edge of the peripheral plate portion 10, and rises from the peripheral plate portion 10. As shown in FIG. 7, the outer peripheral surfaces of the two disk tail portions 14 and 15 are each curved in a spherical shape that comes into sliding contact with the valve box seal ring 3 when the valve body 6 is set to the small opening degree E.
[0016]
The one disk tail portion 14 is displaced toward the upstream side A with the rotation of the valve body 6 in the rotation direction C at the time of opening. Further, the other disk tail portion 15 is displaced toward the downstream side B with the rotation of the valve body 6 in the rotation direction C at the time of opening.
[0017]
The one disk tail portion 14 is formed with a water passage hole 16 having one end opened to the outer peripheral surface and the other end opened to the inner peripheral surface. The water passage hole 16 has an elongated oval shape along the circumferential direction of the valve body 6 and is formed at one location adjacent to the peripheral plate portion 10.
[0018]
As shown in FIGS. 7 and 8, the fluid flowing from the upstream side A to the downstream side B through the water passage 16 is applied to the peripheral plate portion 10 of the valve body 6 from the back side D to the downstream side of the valve body 6. A protection guide plate 17 (an example of a protection guide body) that guides in the direction away from B is provided. The protection guide plate 17 has an inclined guide surface 17a facing the inner peripheral surface side opening 16a of the water passage hole 16. The guide surface 17a is inclined toward the inner peripheral side of the peripheral plate portion 10 toward the downstream side B.
[0019]
Further, on the other disk tail portion 15 side, the water passage hole 16 as described above is not formed, and the protection guide plate 17 does not exist.
Hereinafter, the operation of the above configuration will be described.
[0020]
At the beginning of the operation at the time of initial filling and refilling when laying the pipe, the valve element 6 is in the fully closed position S as shown by a solid line in FIG. The rim slides on the valve box seal ring 3 so that the upstream side A and the downstream side B of the valve body 6 are sealed watertight. Thereafter, in order to prevent the piping from being damaged by sudden water filling, as shown in FIG. 7, the valve body 6 is opened to a small opening degree E, and the downstream piping is filled with a small flow rate.
[0021]
That is, when the valve body 6 is opened to the small opening degree E by the opening operation, the outer peripheral surfaces of the two disk tail portions 14 and 15 are in sliding contact with the valve box seal ring 3, respectively. In the fully opened state, the upstream side A and the downstream side B in the valve box 2 via the valve body 6 communicate with each other only through the water passage 16.
[0022]
Thereby, the fluid (agricultural water or the like) on the upstream side A becomes a high-speed jet when flowing from the outer peripheral surface side of the one disk tail portion 14 to the inner peripheral surface side through the water passage hole 16, and flows to the downstream side B. The water flows to the downstream piping.
[0023]
At this time, the jet is guided by the guide surface 17a of the protection guide plate 17 in the direction F away from the back side D of the valve body 6 (that is, the back side D of the valve body 6 in the rotation direction C) to the downstream side B. Therefore, it does not directly hit the back side D of the valve body 6. Therefore, it is possible to prevent the coating of the valve element 6 from peeling off due to the direct impact of the jet.
[0024]
In addition, since the flow direction of the direct jet is bent by the guide surface 17a of the protection guide plate 17 and greatly changes, the momentum of the jet is reduced.
Further, as shown in FIG. 7, since the other disk tail portion 15 does not have the water passage hole 16, the fluid is blocked by the other disk tail portion 15 and the inner peripheral surface of the other disk tail portion 15 is blocked. The flow from the side to the outer peripheral surface side is prevented. As a result, the fluid jet does not hit the inner peripheral surface of the valve box 2 through the other disk tail portion 15, and therefore, the coating on the inner peripheral surface of the valve box 2 is peeled off by the direct impact of the fluid jet. Can be prevented.
[0025]
Further, as a second embodiment, as shown in FIG. 9, the surface of the guide surface 17 a of the protection guide plate 17 may be covered with the protection member 21. In addition, as the protective member 21, a material in which a stainless material is thinly coated (coated) on the guide surface 17 a or the like is used.
[0026]
According to this, since the guide surface 17a is protected by the protection member 21, the abrasion of the guide surface 17a due to the jet can be reduced.
In the above embodiments, only one water passage hole 16 is formed in one disk tail portion 14 as shown in FIG. 4, but a plurality of water passage holes 16 may be formed.
[0027]
In the first embodiment, as shown in FIG. 7, the valve element 6 is constituted by a hollow main body 9 and a plate-shaped peripheral plate 10 formed on the outer periphery of the main body 9. However, the present invention is not limited to such a shape. For example, as shown in FIG. 10 as a third embodiment, the valve body 6 is formed in a disk shape gradually thinner toward the outer periphery, and is formed in the center. A boss 11 may be provided.
[0028]
【The invention's effect】
As described above, according to the present invention, when the valve body is set to a small opening degree, the fluid becomes a high-speed jet when flowing from the outer peripheral surface side of one disk tail portion to the inner peripheral surface side through the water hole. However, since this jet is guided by the protective guide body in a direction away from the back side of the valve body (that is, the back side of the valve body in the rotation direction at the time of opening) to the downstream side, the jet flow is formed on the back side of the valve body. There is no direct hit. Therefore, it is possible to prevent the coating of the valve body from peeling off due to the direct impact of the jet.
[0029]
Further, since there is no water hole in the other disk tail, the fluid is blocked by the other disk tail and the flow from the inner peripheral surface to the outer peripheral surface of the other disk tail is prevented. You. Accordingly, the jet of the fluid does not hit the inner peripheral surface of the valve box through the other disk tail portion, and therefore, the coating of the inner peripheral surface of the valve box is prevented from being peeled off by the direct impact of the jet. Can be.
[Brief description of the drawings]
FIG. 1 is a side view of a butterfly valve according to a first embodiment of the present invention.
FIG. 2 is a view taken along the line XX in FIG. 1;
FIG. 3 is a transverse sectional view when the valve body of the butterfly valve is in a fully closed position.
FIG. 4 is a perspective view of a valve body of the butterfly valve.
FIG. 5 is a view of the valve body of the butterfly valve as viewed from a rotation axis direction of a valve stem.
FIG. 6 is a view taken along the line XX in FIG. 5;
FIG. 7 is a transverse sectional view when the valve body of the butterfly valve is set to a small opening degree.
FIG. 8 is an enlarged sectional view of a portion of a protection guide plate of the butterfly valve.
FIG. 9 is an enlarged sectional view of a portion of a protection guide plate of a butterfly valve according to a second embodiment of the present invention.
FIG. 10 is a cross-sectional view of a butterfly valve according to a third embodiment of the present invention when the valve body is set to a small opening.
FIG. 11 is a diagram of a conventional butterfly valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Butterfly valve 2 Valve box 3 Valve box seal ring 5 Rotation axis 6 Valve element 7 Valve rod 14 One disk tail part 15 The other disk tail part 16 Water hole 16a Inner peripheral surface opening 17 Protection guide plate (protection) Information body)
A Upstream side B Downstream side C Rotation direction at opening D Back side of valve E Small opening S Fully closed position

Claims (1)

A valve case seal ring arranged in an annular shape along the inner peripheral surface in the valve case, a valve body that rotates around the axis of the valve rod and slides on the valve case seal ring at the fully closed position, And a pair of disc tails attached to the back side of the valve body in the direction of rotation of the valve body, wherein the disk tail is formed in a fan shape in the direction of rotation of the valve body and provided on the peripheral edge of the valve body. The valve body has a spherically curved outer peripheral surface that slides on the valve box seal ring when the valve body is at a small opening degree, and is displaced upstream in the flow direction with rotation of the valve body when the valve body is opened. A water passage hole is formed in one of the disk tail portions, one end of which is opened on the outer peripheral surface side and the other end is opened on the inner peripheral surface side. The protective guide that guides away from the back side of the body to the downstream side is To face the inner peripheral surface side opening of the water hole, a butterfly valve having a filling of water functions, characterized in that provided on the valve body.

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