JP2536486Y2 - Butterfly valve - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) The present invention relates to an improvement of a butterfly valve used for opening / closing or adjusting a flow rate of a pipe for flowing water, oil, gas, and the like. The present invention relates to a butterfly valve that reliably prevents leakage from a shaft portion and has excellent durability and operability.

(Conventional technology and its problems) A conventional butterfly valve in which an annular seat ring formed of an elastic material such as rubber is attached to the inner peripheral surface of an annular body, is caused by fluid flow, rotation of a valve plate, or movement by fluid pressure. The seat ring moves, and the through hole of the seat ring pushes the valve shaft, so that the torque for rotating the valve shaft increases, the wear of the through hole increases, and the gap between the through hole and the valve shaft increases. From the outside.

Especially in severe cases, the through-hole pushes the valve shaft and tilts the valve shaft, increasing the above-mentioned torque and wear, and further increasing the occurrence of leakage, and furthermore, the torque is unstable and operability is deteriorated. Had a problem.

 For these reasons, the durability was poor.

The present invention is intended to solve the problems of these conventional butterfly valves.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the invention of the present application mounts an annular seat ring formed of an elastic material such as rubber on the inner peripheral surface of the annular body, and A butterfly valve is formed by forming a boss protruding outward around a through hole through which a valve stem penetrates, and fitting the boss to a fitting hole formed in a body, wherein the end face of the boss is a convex or concave cone. The end face was pressed against the bottom of the fitting hole.

Also, an annular seat ring formed of an elastic material such as rubber is attached to the inner peripheral surface of the annular body, and a boss portion protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. In a butterfly valve in which a boss portion is fitted in a fitting hole formed in a body, an end surface of the boss portion is formed into an annular flat surface, a concentric annular projection is provided on the annular flat surface, and the end surface of the boss portion is pressed against the bottom surface of the fitting hole. An annular projection was provided on the outer peripheral surface of the boss portion, and the outer peripheral surface was pressed against the inner peripheral surface of the fitting hole.

Further, an annular seat ring formed of an elastic material such as rubber is mounted on the inner peripheral surface of the annular body, and a boss portion protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. In the butterfly valve in which the boss portion was fitted in the fitting hole formed in the body, the bottom surface of the fitting hole was formed as a convex or concave conical surface or a spherical surface, and this bottom surface was pressed against the end surface of the boss portion.

(Operation) The butterfly valve of the present invention forms a boss portion projecting outward around a through hole through which the valve shaft of the seat ring passes, and forms a fitting hole into which the boss portion fits in the body. Is fitted into the fitting hole, and the valve shaft is fitted through the through hole, so that the body, the seat ring, the valve shaft, and the valve plate fixed to the valve shaft are securely and concentrically assembled, and the valve shaft is The torque to rotate and open and close the valve is stable.

Furthermore, even when the seat ring slightly moves due to the flow of the fluid, the rotation of the valve plate, or the movement due to the fluid pressure, the boss portion is fitted into the fitting hole of the body near the through hole of the seat ring. There is almost no movement, the seat ring does not push the valve shaft to increase the opening and closing torque, the wear of the through hole does not increase, and there is a fear that leakage will occur from between the through hole and the valve shaft. Absent.

In addition, by sealing the end face, inner and outer faces of the boss part or the bottom face of the fitting hole by pressing, the leakage from the end face and the outer face of the boss part and the leak between the through hole and the valve shaft are more effective. In addition, the boss portion does not move further inside the insertion hole, and the operability and the durability are excellent.

(Embodiment) FIG. 1 is a half-cut perspective view showing an embodiment of the butterfly valve of the present invention, and FIG. 2 is a longitudinal sectional view showing a part of FIG.

1 and 2, reference numeral 1 denotes a body, 2 denotes a seat ring, 3 denotes a valve shaft, and 4 denotes a valve plate.
An annular seat ring 2 made of an elastic material such as rubber is mounted on an inner peripheral surface 1a of the valve body, and a valve shaft 3 passes through a through hole 2a formed in the seat ring 2 and a valve shaft hole 1b formed in the body 1. The valve plate 4 is fixed to the valve shaft 3 and the valve shaft 3
Is rotated to open and close the butterfly valve 5.

A boss 2b projecting outward is formed around the through hole 2a of the seat ring 2, and a fitting hole 1c into which the boss 2b fits in the body 1 is formed.

3 to 8 are partial longitudinal sectional views showing an embodiment of the boss portion 2b of the seat ring 2, and the seat ring 2 shown in FIG. 3 has an end surface 2c of the boss portion 2b having a convex shape. When the boss portion 2b is fitted into the fitting hole 1c, the fitting hole as shown in FIG.
A high contact pressure annular contact zone is formed on the side near the through hole 2a between the flat bottom surface 1d of the base ring 1c and the portion near the end surface 2c of the through hole 2a, and the seat ring 2 and the body are reduced in diameter. 1 and between the seat ring 2 and the valve shaft 3.

The seat ring 2 shown in FIG. 4 has an end face 2c of the boss 2b.
Is a concave conical surface, and similarly, when a concave spherical surface is used, when the boss portion 2b is fitted into the fitting hole 1c, the flat bottom surface 1d of the fitting hole 1c as shown in FIG. A high contact pressure annular contact zone is formed on the side near the outer edge between
The diameter of the portion of 2b near the end surface 2c is increased, and the effect of sealing between the seat ring 2 and the body 1 is enhanced.

FIG. 5 shows the seat ring 2 shown in FIGS. 6 and 7.
Are the end surface 2c, the outer peripheral surface 2d, and the inner peripheral surface of the boss portion 2b, respectively.
2e is provided with an annular projection 2f. When the boss 2b is inserted into the insertion hole 1c as shown in FIG.
Bottom surface 2c, outer peripheral surface 2d, inner peripheral surface 2e and fitting hole 1c or valve shaft 3
The effect of sealing between is enhanced.

The seat ring 2 shown in FIG. 8 is such that a portion of the through hole 2a close to the end face 2c is conically reduced in diameter toward the end face 2c. The effect of sealing between the shaft 3 is enhanced.

9 and 10 show the bottom surface 1d of the fitting hole 1c of the body 1.
Are convex and concave conical surfaces, respectively, as in the case of convex and concave spherical surfaces, when the seat ring 2 having the flat end surface 2c as shown in FIG. 11 is attached. In the shape shown in FIG. 9, a high contact pressure annular contact zone is formed on the bottom surface 1d of the seat ring 2 near the through hole 2a, and the diameter of the portion of the through hole 2a near the end face 2c is reduced. The effect of sealing between the ring 2 and the body 1 and between the seat ring 2 and the valve shaft 3 is enhanced. In the shape of FIG. 10, an annular contact zone of high surface pressure is formed on the side near the outer edge of the end surface 2c of the seat ring 2, and the portion of the boss portion 2b near the end surface 2c is enlarged, so that the seat ring The effect of sealing between the body 2 and the body 1 is enhanced.

Next, the operation will be described based on the embodiment shown in FIGS.

The butterfly valve 5 forms a boss 2b protruding outward around a through hole 2a through which the valve shaft 3 of the seat ring 2 penetrates, and forms an insertion hole 1c into which the boss 2b fits in the body 1, The boss 2b is inserted into the insertion hole 1c, and the valve shaft 3 is inserted into the through hole 2a.
The body 1, the seat ring 2, the valve shaft 3, and the valve plate 4 fixed to the valve shaft 3 are surely mounted concentrically, and the valve shaft 3 is rotated to rotate the valve 5. The opening and closing torque is stable.

Furthermore, even when the seat ring 2 slightly moves due to the flow of the fluid, the rotation of the valve plate 4 or the movement by the fluid pressure,
The vicinity of the through hole 2a of the seat ring 2 hardly moves because the boss portion 2b is fitted into the fitting hole 1c of the body 1, and the seat ring 2 pushes the valve shaft 3 to increase the opening / closing torque. Therefore, there is no fear of leakage from between the through hole 2a and the valve shaft 3 without increasing the wear of the through hole 2a.

Further, by forming the end surface 2c, the inner peripheral surface 2e, the outer peripheral surface 2f of the boss portion 2b, or the bottom surface 1d of the fitting hole 1c as shown in the embodiment, as described above, the end surface of the boss portion 2b is formed. 2c, leakage between the outer peripheral surface 2d and the fitting hole 1c and leakage between the through hole 2a and the valve shaft 3 can be more effectively prevented.

For this reason, the butterfly valve 5 of the present invention is
It has excellent durability.

Effects of the Invention The butterfly valve of the present invention is configured and operates as described above, and thus has the following effects.

At the time of assembly, the body, the seat ring, the valve shaft, and the valve plate fixed to the valve shaft are easily assembled concentrically, and the operating torque for rotating the valve shaft to open and close the valve is stable.

Even when the seat ring slightly moves due to the rotation of the valve plate or the fluid pressure, the vicinity of the through hole hardly moves due to the boss being fitted into the fitting hole,
There is no increase in opening / closing torque or increase in wear of the through-hole.

Therefore, there is no leakage from around the valve shaft.

Furthermore, by appropriately forming the shape of the boss portion and the shape of the bottom surface of the fitting hole, it is possible to reliably prevent leakage from between the seat ring and the body or between the seat ring and the valve shaft.

As a result, a butterfly valve having excellent reliability, durability and operability can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the butterfly valve of the present invention, and FIG. 2 is a partial longitudinal sectional view showing a part of FIG. 3 to 8 are partial longitudinal sectional views showing an embodiment of the boss portion of the seat ring of the butterfly valve according to the present invention, and FIGS. 9 and 10 are embodiments of the fitting hole of the body. FIG. 11 is a partial vertical sectional view showing FIG. 9 and FIG.
FIG. 11 is a partial longitudinal sectional view of a seat ring for inserting a boss into the insertion hole shown in FIG. 10; 1 ... body, 1a ... inner peripheral surface 1b ... valve shaft hole, 1c ... fitting hole 1d ... bottom surface, 2 ... seat ring 2a ... through hole, 2b ... boss portion 2c ... end surface, 2d ... Outer peripheral surface 2e ... Inner peripheral surface, 2f ... Circular projection 3 ... Valve shaft 4 ... Valve plate 5 ... Butterfly valve

Claims (6)

(57) [Scope of request for utility model registration] 1. An annular seat ring made of an elastic material such as rubber is mounted on the inner peripheral surface of an annular body, and a boss protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. The end face of the boss portion is formed as a convex conical surface or a convex spherical surface, and the end surface is pressed against the bottom surface of the fitting hole in the butterfly valve having the boss portion fitted in the fitting hole formed in the body. A butterfly valve characterized by the following. 2. An annular seat ring made of an elastic material such as rubber is mounted on an inner peripheral surface of an annular body, and a boss portion protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. In the butterfly valve having the boss portion fitted in the fitting hole formed in the body, the end surface of the boss portion is formed as a concave conical surface or a concave spherical surface, and the end surface is pressed against the bottom surface of the fitting hole. And butterfly valve. 3. An annular seat ring formed of an elastic material such as rubber is mounted on an inner peripheral surface of the annular body, and a boss portion protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. Then, in a butterfly valve in which the boss portion is fitted in a fitting hole formed in the body, the end surface of the boss portion is formed into an annular plane, and a concentric annular projection is provided on the annular plane, and the end surface of the boss portion is provided on the bottom surface of the fitting hole. Butterfly valve characterized by being pressed. 4. An annular seat ring made of an elastic material such as rubber is mounted on the inner peripheral surface of the annular body, and a boss protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. A butterfly valve having the boss portion fitted in a fitting hole formed in a body, wherein an annular projection is provided on an outer peripheral surface of the boss portion, and the outer peripheral surface is pressed against an inner peripheral surface of the fitting hole. valve. 5. An annular seat ring formed of an elastic material such as rubber is mounted on the inner peripheral surface of the annular body, and a boss portion protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. Then, in the butterfly valve having the boss portion fitted into the fitting hole formed in the body, the bottom surface of the fitting hole is formed as a convex conical surface or a convex spherical surface, and the bottom surface is pressed against the end surface of the boss portion. A butterfly valve characterized by the following. 6. An annular seat ring made of an elastic material such as rubber is mounted on an inner peripheral surface of the annular body, and a boss portion protruding outward is formed around a through hole through which a valve shaft of the seat ring passes. In the butterfly valve having the boss portion fitted into the fitting hole formed in the body, the bottom surface of the fitting hole is formed as a concave conical surface or a concave spherical surface, and the bottom surface is pressed against the end surface of the boss portion. And butterfly valve.