JP7190765B1 - butterfly valve - Google Patents

Abstract

An object of the present invention is to provide a butterfly valve having a seat member made of an elastic material, in which opening and closing torque of the valve is reduced and convenience is improved. A butterfly valve that opens and closes a valve by rotating a valve body, comprising a valve body (3), a valve copper (1), and a seat member (2) made of an elastic material. It is attached between the valve body 3 and the valve copper 1, and the inner peripheral surface of the valve copper 1 is provided with relief grooves 11a for releasing the deformation of the seat member 2 on the surface that contacts the seat member 2. , butterfly valve. [Selection drawing] Fig. 2

Description

Application of Article 30, Paragraph 2 of the Patent Act On June 7, 2021, Niikura Industries Co., Ltd. distributed a prototype butterfly valve to Miho Shipbuilding Co., Ltd.

The present invention relates to a butterfly valve having a seat member made of elastic material.

Traditionally, various valves have been used to control the flow of fluids.

In particular, butterfly valves are widely used because of their advantages such as low fluid resistance when the valve is opened and easy opening and closing operations.

A butterfly valve is a valve that has a disc-shaped valve body and a cylindrical valve body, and that opens and closes by rotating the valve body installed inside the valve body.

In designing a butterfly valve, it is now a well-known technique to provide a seat member made of an elastic material between the valve body and the valve body in order to improve the sealing performance when the valve is closed.

For example, Patent Literature 1 describes a butterfly valve in which an annular seat member made of an elastic material is attached to the outer peripheral surface of a valve body.

Patent Document 2 describes a butterfly valve in which an annular seat member made of an elastic material is attached to the inner peripheral surface of the valve body.

Japanese Patent Publication No. 62-46751 Japanese Patent Publication No. 8-1267

However, the seat member made of an elastic material has the problem of increasing the opening and closing torque of the valve while improving the sealing performance when the valve is closed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a butterfly valve having a seat member made of an elastic material, in which opening and closing torque of the valve is reduced and convenience is improved. is the subject.

In order to solve the above problems, the present invention provides a butterfly valve that opens and closes by rotating a valve body,
comprising a valve body, a valve body, and a seat member made of an elastic body,
The seat member is attached between the valve body and the valve body ,
The inner peripheral surface of the valve body is provided with relief grooves for relief of deformation of the seat member on the surface that contacts the seat member.

According to the present invention, the deformation that occurs in the elastic seat member due to the rotation of the valve body can be relieved to the relief groove, and the opening and closing torque of the valve can be reduced.

In a preferred embodiment of the present invention, the valve body has a fitting groove for fitting the seat member,
The fitting groove includes the escape groove inside.

With such a configuration, the deformation of the seat member can be directed to the escape groove via the fitting groove, further enhancing the opening/closing torque reduction effect.
In addition, the fitting groove allows the seat member to be detachably attached to the valve body with a simple structure.

In a preferred form of the invention, the relief groove is provided along the inner peripheral surface of the valve body .

With such a configuration, the relief groove has a shape that follows the outer periphery of the valve body, and the deformation of the seat member due to the rotation of the valve body can be efficiently relieved, further enhancing the effect of reducing the opening and closing torque.

In a preferred form of the present invention, the relief groove is formed in the center of the inner peripheral surface of the valve body.

With such a configuration, the relief groove is positioned at the central portion of the inner peripheral surface of the valve body where the opening/closing torque of the valve is maximized, further enhancing the effect of reducing the opening/closing torque.

Moreover, in a preferred embodiment of the present invention, the relief groove is formed in a substantially annular shape.

With such a configuration, the relief groove has a shape that follows the outer periphery of the valve body, and most of the deformation of the seat member that occurs when the valve is opened and closed can be relieved to the relief groove, thereby reducing the opening and closing torque. further increase.

Also, in a preferred embodiment of the present invention, the escape groove is formed in a substantially strip shape.

With such a configuration, more deformation of the seat member that occurs during the opening and closing operation of the valve can be relieved to the relief groove, further enhancing the effect of reducing the opening and closing torque.

ADVANTAGE OF THE INVENTION According to this invention, the butterfly valve provided with the seat member formed from the elastic body WHEREIN: The opening-and-closing torque of a valve can be reduced and the convenience can be improved.

1 is a schematic perspective view of a butterfly valve according to an embodiment of the invention; FIG. FIG. 2 is an exploded view of the butterfly valve according to the embodiment of the present invention, showing (A) a schematic perspective view of the valve body and (B) a PP' cross-sectional view. FIG. 4 is an exploded view of the butterfly valve according to the embodiment of the present invention, including (A) a schematic perspective view of the seat member and (B) a QQ′ cross-sectional view. FIG. 4 is an exploded view of the butterfly valve according to the embodiment of the present invention, showing (A) a schematic perspective view and (B) an RR′ cross-sectional view of the valve body after mounting the seat member. 1(A) An exploded view (valve body), (B) a schematic perspective view, and (C) an SS′ sectional view of a butterfly valve according to an embodiment of the present invention. FIG. FIG. 4A is a view when the valve is open, and FIG. 4B is a partially enlarged view of the SS′ cross section for explaining the effects of the present invention.

A butterfly valve according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG.
In addition, the embodiment shown below is an example of the present invention, and the present invention is not limited to the following embodiments. Moreover, in these figures, the code|symbol X shows the butterfly valve which concerns on this embodiment.
Further, hereinafter, the term "center" refers to a portion of the valve body or seat member that is in the middle between one surface and the other surface that are substantially perpendicular to the fluid passage.

As shown in FIG. 1 , the butterfly valve X includes a valve body 1 , a seat member 2 made of an elastic material, and a valve body 3 .
The upper valve shaft Us and the lower valve shaft Ls, which are inserted inside, are indicated by dashed lines.

As shown in FIG. 2, the substantially cylindrical valve body 1 has a substantially annular fitting groove 11 provided at the center of the inner peripheral surface and a pair of grooves provided on one surface and the other surface that are substantially perpendicular to the fluid passage. It has a substantially annular sub-fitting groove 12 and a pair of insertion shaft holes 13 provided vertically.
The fitting groove 11 includes an escape groove 11a formed in a substantially annular shape in the center of the interior.

Further, the valve body 1 has an upper flange Uf , a side flange Sf, a valve barrel ss, and a lightening portion r, but these may be designed to be increased or decreased as appropriate.

As shown in FIG. 3, the substantially cylindrical seat member 2 has a substantially annular fitting protrusion 21 provided at the center of the outer peripheral surface, and a pair of fitting protrusions 21 provided on one surface and the other surface substantially perpendicular to the fluid passage. It has a substantially annular outer edge portion 22, a pair of insertion shaft holes 23 provided on the upper and lower sides, and a substantially annular close-contact protrusion 24 provided at the center of the inner peripheral surface.
The pair of outer edge portions 22 are provided with a substantially annular sealing uneven portion 22a and a substantially annular sub-fitting protrusion 22b, respectively.

The seal concave-convex portion 22a is provided with a plurality of substantially annular concave-convex portions, which has the effect of making it difficult for the fluid to leak from the junction between the valve and the pipeline or the like.

As shown in FIG. 4, the valve body 1 and the seat member 2 are fitted with the fitting groove 11 and the fitting ridge 21, and the sub-fitting groove 12 and the sub-fitting ridge 22b, respectively. and attached to each other.
At this time, a space for releasing the deformation of the sheet member 2 can be created between the fitting groove 11 and the fitting protrusion 21 by forming the relief groove 11a.

As shown in FIG. 5, the valve body 3 is incorporated into the valve body 1 to which the seat member 2 is attached via the upper valve stem Us and the lower valve stem Ls.
The upper valve shaft Us and the lower valve shaft Ls, which are inserted inside, are indicated by dashed lines.

As shown in FIG. 5(C), the outer peripheral surface of the valve body 3 can be brought into close contact with the tight protrusion 24, thereby enhancing the sealing performance when the valve is closed.
Further, the relief groove 11a, which is formed in a substantially annular shape, can form a space on the back side of the close-fitting protrusion 24 along the outer peripheral surface of the valve body 3 when the valve is closed.

FIG. 6(A) is a cross-sectional view of the butterfly valve X taken along line S--S' during valve opening operation, and FIG. 6(B) shows an enlarged view of the shaded portion in (A). The effects of the present invention will be described in detail below with reference to these figures.

First, when the valve body 3 begins to rotate in the direction d1, the valve body 3 comes into contact with the tight protrusion 24, and a force is transmitted to the seat member 2, causing it to deform.

At this time, the deformation occurring in the sheet member 2 is relieved in the direction d2 by the presence of the relief groove 11a.

As the deformation of the seat member 2 is relieved in the direction d2, the force that the valve body 3 receives from the seat member 2 is temporarily weakened, and the rotational torque of the valve body 3 is reduced.

This is because the rotational torque of the valve body 3 is similarly reduced even during the valve closing operation in which the direction d1 is reversed.

Therefore, the relief groove 11a reduces the opening/closing torque of the valve body 3 particularly at the central portion of the valve body where the opening/closing torque is maximum.

Moreover, the sealing performance between the valve body 3 and the seat member 2 can be maintained by the restoring force that causes the deformation in the seat member 2 to escape to the escape groove 11a.

Further, the deformation of the seat member 2 caused by the opening and closing of the valve body 3 is relieved by the escape groove 11a, so that the wear of the seat member 2 can be reduced to less than half and the durability of the seat member 2 can be enhanced.

According to this embodiment, the relief groove 11a is provided on the inner peripheral surface of the valve body 1 with which the elastic seat member 2 abuts. It is possible to escape to the escape groove 11a and reduce the opening and closing torque of the valve.

Further, the valve body 1 has a fitting groove 11 for fitting the seat member 2, and the fitting groove 11 includes an escape groove 11a inside, so that the deformation that occurs in the seat member 2 is reduced by the fitting groove. 11 toward the escape groove 11a, further enhancing the effect of reducing the opening/closing torque.

In addition, since the relief groove 11a is provided along the inner peripheral surface of the valve body 1, the relief groove 11a has a shape along the outer periphery of the valve body 3, and deformation of the seat member 2 accompanying the rotation of the valve body 3 is prevented . can be efficiently released, further enhancing the effect of reducing opening and closing torque.

In addition, since the relief groove 11a is formed in the center of the inner peripheral surface of the valve body 1, the relief groove 11a is located in the center of the inner peripheral surface of the valve body 1, where the opening/closing torque of the valve is maximized. Further enhance the torque reduction effect.

In addition, since the relief groove 11a is formed in a substantially annular shape, most of the deformation of the seat member 2 that occurs when the valve is opened and closed can be relieved to the relief groove 11a, further enhancing the effect of reducing the opening and closing torque. .

In addition, since the relief groove 11a is formed in a substantially strip shape, the deformation of the seat member 2 generated when the valve is opened and closed can be relieved to the relief groove 11a more, and the effect of reducing the opening and closing torque is further enhanced.

It should be noted that the shapes, dimensions, etc., of the constituent members shown in the above-described embodiment are merely examples, and can be changed in various ways based on design requirements and the like.

For example, the escape groove 11 a may be provided independently on the inner peripheral surface of the valve body 1 instead of inside the fitting groove 11 .
By doing so, the shapes of the fitting groove 11 and the relief groove 11a are not restricted to each other, and can be freely designed according to desired specifications.

Also, the escape groove 11a does not have to be along the center of the inner peripheral surface.
For example, assuming an eccentric butterfly valve or the like, the opening and closing torque of the valve may not be maximized at the center of the inner peripheral surface of the valve body 1, so a design suitable for this may be considered.

Also, the relief groove 11a may not be substantially annular or substantially strip-shaped.
For example, if the valve body 3 has a special shape instead of the substantially disk shape shown in the above embodiment, the deformation of the seat member 2 can be released more efficiently according to the shape. The shape of the escape groove 11a can be considered.

Further, by adjusting the width and depth of the escape groove 11a, it is possible to obtain the desired sealing performance and the effect of reducing the opening/closing torque, etc., and it is possible to meet various specifications.

INDUSTRIAL APPLICABILITY The present invention relates to a butterfly valve having a seat member made of an elastic material, and therefore can be suitably used in many situations where butterfly valves are used.

X butterfly valve 1 valve body
11 Fitting groove 11a Relief groove 12 Sub-fitting groove 13 Insertion hole 2 Seat member 21 Fitting protrusion 22 Outer edge portion 22a Seal uneven portion 22b Sub-fitting protrusion 23 Insertion hole 24 Close protrusion 3 Valve body Us Upper valve stem Ls Lower valve Shaft Uf Upper flange Sf Side flange ss Valve barrel r Lightening part

Claims (6)

A butterfly valve that opens and closes by rotating a valve body,
comprising a valve body, a valve body, and a seat member made of an elastic body,
the seat member attached between the valve body and the valve body has a fitting ridge on its outer peripheral surface;
The inner peripheral surface of the valve body in contact with the outer peripheral surface of the seat member is provided with a fitting groove into which the fitting protrusion is fitted,
A butterfly valve, wherein a relief groove is further provided inside the fitting groove for relief of deformation of the seat member. The inner peripheral surface of the sheet member is provided with a close-fitting ridge,
2. The butterfly valve according to claim 1 , wherein said relief groove is provided at a position opposite to the back side of said tight protrusion . 3. The butterfly valve according to claim 1, wherein said escape groove is provided along the inner peripheral surface of said valve body . The butterfly valve according to any one of claims 1 to 3, wherein said escape groove is formed in the center of the inner peripheral surface of said valve body . The butterfly valve according to any one of claims 1 to 4, wherein said escape groove is formed in a substantially annular shape. The butterfly valve according to any one of claims 1 to 5, wherein said escape groove is formed in a substantially strip shape.

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