JPS6057066A - Butterfly valve - Google Patents

Abstract

PURPOSE:To make valve operating force smaller and to intercept high water pressure by providing a water-seal member disposed in a groove formed on the inner circumferential side of a valve shell and a water-seal control member which brings said member in pressure-contact with or separated from the outer circumference of the valve. CONSTITUTION:Water-seal members 6 are slidably mounted in a groove 10 formed inside a valve shell 1 on the water-sealing position of a valve body 2, and holding jaws 7 having slopes are fixed to both ends. Clamp units 8 are pushed into V-shape portions formed by the slopes, then holdin jaws 7, 7 fixed by respective water-seal members 6 are got away and the water-seal members 6 are pressed to the outer circumference of the valve body 2 to seal water. When the valve body 2 is moved from the valve open position to the close position, after the valve body 2 is completely revolved to the close position, the clamp units 8 are driven by a servo motors 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a valve for blocking the passage of fluid, particularly a tough-fly valve suitable for use in large-diameter, high-head applications.

[Background of the invention]

1 to 4 show a conventional cutter fly valve, and FIGS. 1 and 3 are longitudinal sectional views and FIG. 2, respectively.

FIG. 4 is a cross-sectional side view of FIG. 1 and FIG. 3, respectively.

In FIGS. 1 and 2, 1 is a cylindrical valve body, and 2 is a disc-shaped valve body, which is rotatably attached to the valve body 1 so as to block the flow of fluid. It is fixed to a valve shaft 9 passing through the valve 1 and is driven to open and close. 3 is a water-sealing backing attached to the outer periphery of the valve body 2, and 4 is a valve seat.

In the above conventional structure, when the valve body 2 rotates from the open position to the closed position, that is, when it moves from the open position to the closed position, the water sealing backing 3 and the valve seat 4 have a small valve opening. As the pressure increases, the contact portion becomes increasingly stiffer, and the entire circumference of the water sealing backing comes into contact with the valve seat 4 in the fully closed position.

Then, a preset interference of the water-sealing backing 3 acts to perform the water-sealing action. Therefore, when the valve body 2 rotates, the contact with the water-sealing backing 3 generates a large frictional force, requiring an operating force that is approximately the same as the mechanical frictional force generated by the valve stem.

Furthermore, in order to reduce the valve turning force in the structure shown in FIGS. 1 and 2, a method shown in FIG. 3 is conventionally known. In the method shown in FIG. 3, the valve seat 4 is not used, but a hose-shaped valve seat backing 5 is housed on the inner circumferential side of the valve body 1 in the closed position of the valve body 2. When the valve body 2 is opened, the fluid pressure inside the valve seat backing 5 is discharged to prevent it from coming into contact with the outer periphery of the valve body 2, and when the valve body 2 is in the fully closed position, the valve seat backing 5
Pressure is applied inside to expand the valve seat backing 5 and bring it into close contact with the outer periphery of the valve body 2 to form a water seal.

However, in this method, since the valve seat backing 5 is made of rubber or soft resin material, when the valve body 2 is fully closed,
The gap created by the valve body 2 being bent by the internal pressure of the valve body 1 prevents damage due to misalignment of the contact position between the valve seat backing 5 and the valve body 2 and protrusion on the end face of the valve seat backing 5. arise. Furthermore, the valve seat backing 5 may be damaged and its lifespan will be shortened.9 Therefore, it is difficult to use it for high-pressure valves whose working pressure exceeds 20 kg/cm2. For this reason, in the past, in order to eliminate the above-mentioned problems, it was necessary to increase the rigidity of the valve body 2, which increased manufacturing costs and became uneconomical.

[Purpose of the invention]

The present invention was made in view of the above situation, and an object of the present invention is to provide a butterfly valve that has a simple structure, requires little valve operation force, is durable, and can shut off high water pressure. be.

[Summary of the invention]

The butterfly I of the present invention includes a cylindrical valve body, a disc-shaped valve body disposed inside the valve body, a valve body that penetrates the valve body, fixes the valve body, and allows the valve body to be removed from the outside of the valve body. a valve shaft formed to be able to drive the valve body to open and close; the valve body is slidably attached to a groove formed on the inner circumferential side of the valve body with a backing interposed therebetween, and is wrapped around the outer circumference of the valve body; The water sealing member is provided with a water sealing member formed to be able to be unwound, pressed and separated, and a water sealing control member that presses and separates the water sealing member from the outer periphery of the valve body.

[Embodiments of the invention]

Below, the butterfly valve of the present invention will be described as an example, and the same parts as the conventional one will be denoted by the same reference numerals, and the structure of the same parts will be explained. The explanation will be omitted with reference to FIGS. 5 to 5. 5 is a sectional view of the valve body in the closed position but not in contact with the water sealing member of the backing; FIG. 6 is a sectional view of the valve body after the water sealing member contacts the valve body from the state shown in FIG. 5; 7 is a side view showing a part of FIG. 6 in cross section, and FIG. 8 is a perspective view of section A in FIG. 7 with the tightening piece removed. In the figure, 6 is a backing water sealing member formed in half, which is made of a soft, elastic, rust-resistant material, such as metal materials such as 18.8 stainless steel, phosphor bronze, hard rubber, etc. The material, plastic material, or water sealing part is made of a rubber material or the like, and the part that imparts elasticity is made of a composite material made of a metal material. This water sealing member 6 is slidably attached in a groove 10 formed inside the valve body 1 at the water sealing position of the valve body 2, and has slopes 21 at both ends, respectively, as shown in FIG. A locking jaw 7 is fixed. Then, the water sealing members 6 adjacent to each other
The v-shaped part 22 is formed by the slopes 21, 21 of the locking jaws 7, 7.
It is attached to form a That is, the locking jaw 7,
7 are fixed to the ends of the water sealing member 6 and have slopes 21 and 21 mutually.
are made to face each other to form a V-shaped part 22, and the --shaped part 22 is formed from one locking jaw 7 on one side and two locking jaws on the other side.

By pushing the clamping piece 8 into the ■-shaped portion 22 in the direction of arrow B, the locking jaws 7, 7 fixed to each water sealing member 6 are moved away in the direction of the arrow in FIG. A water sealing member 6 is pressed against the outer periphery of the valve body 2 to seal water. The clamping piece 8 is formed at one end of the water sealing control member 18 and contacts the inclined surface 21 of the locking jaw 7 of the V-shaped portion 22 with an inclined surface 23 having a reverse slope corresponding to the arrow 11 in FIG. It is driven by a piston 12 of a servo motor 11 to be displaced in the C direction. The water sealing control member 18 is connected to the servo motor 1
1. ■-shaped part 2 consisting of a tightening piece 8, locking jaws 7, 7, etc.
It is formed from 2nd grade.

13 is a boat for closing operation of the servo motor 11, 14 is a boat for opening operation, 15 is a seam backing, 16 is a water sealing part,
17 is a backing that seals between the valve body 1 and the water sealing member 6.

In the above structure, when moving the valve body 2 from the open position to the closed position, the valve body 2 is rotated to the closed position as shown in FIG. At this time, the inner diameter of the water sealing member 6 is expanded and it is placed in a position where it does not come into contact with the valve body 2. After the valve body 2 is completely rotated to the closed position, the pressure oil in the servo motor 11 is discharged from the opening boat 14 and refilled from the closing boat 13, as shown in FIGS. 6 and 7. The piston 12 is then driven in the direction of arrow B in FIG. 8, and the clamping piece 8 displaces the locking jaws 7, 7 of the V-shaped portion 22 in the direction of the arrow.

Therefore, the water sealing member 6 has its inner diameter reduced and is pressed against the outer diameter of the valve body 2 to seal water, and the valve body 2 receives and blocks off the water pressure P shown in FIG. 6. In addition, when the valve body 2 is moved from the closed position to the open position, oil is drained from the closing operation boat 13 of the servo motor 11 and pressure oil is supplied from the opening operation boat 14, contrary to the above operation. The inner diameter of the water sealing member 6 is expanded by moving the tightening piece 8 in the direction of arrow C in FIG. 8, and the tightening piece 8 is separated from the valve body 2. Thereafter, the valve body 2 is rotated from the closed position to the open position.

In this way, in the butterfly valve of this embodiment, the water sealing member of the water sealing backing is made of a soft, elastic, and induction-resistant material.
When the valve body is opened and closed, the inner diameter of the water sealing member is expanded or contracted to separate or contact the outer periphery of the valve body when the valve body is in the closed position, so it has a simple structure. ,
While the valve body is rotating, the valve body does not come into contact with the valve seat or backing, so the operating force for opening and closing the valve is purely the mechanical frictional force of the valve stem. compared to,
It is possible to reduce the size and weight of the valve device by about 60%.

゛Also, since the water sealing member of this embodiment uses the above-mentioned material, even if the valve body is deformed due to partial deflection when the valve body is closed, its position will be maintained even if the water sealing surface is displaced. ,
No damage will occur. Therefore, it is possible to effectively maintain a watertight function that allows for a large diameter, high water pressure, and long-term use.

Furthermore, although the above embodiments have been described with reference to the case in which the water sealing ring is constituted by two water sealing members, the effect is the same even if the water sealing ring is constituted by one or three or more water sealing members.

FIG. 7 shows another embodiment, and the difference from the above embodiment is that in the above embodiment, the water sealing surface 16 is formed as a flat surface, whereas in this embodiment, the water sealing surface 16 is formed on a slope. The point is that The water sealing surface 16 of the present embodiment 10 is formed with an inclined surface 19 that forms a groove with a cross section of a ■ shape in the water sealing member 6,
The valve body 2 is formed by breaking a protruding section having a V-shaped cross section and has an inclined surface 20 corresponding to and in contact with the inclined surface 19 of the water sealing member 6 on the outer circumferential portion, and the inclined surfaces 19 and 20 contact and seal water. It is formed like this. Therefore, when the valve is fully opened, the deflection of the valve body 2 due to the liquid pressure is suppressed, and the fitting does not come off at the water sealing surface 16, which can be used even when the pressure is high.

〔Effect of the invention〕

As described above, the batten valve of the present invention has the effect of being able to cut off water pressure with a simple structure, requiring little valve operating force, and with durability.

[Brief explanation of the drawing]

Figures 1 to 4 each show a conventional backfly valve, Figure 1, Figure 9M3 is a longitudinal sectional view, Figure 2, Figure 4 respectively.
The figures show a cross-sectional side view of Fig. 1 and Fig. 3, respectively, and Fig. 5 shows an embodiment of the butterfly valve of the present invention, in which the valve body is in the closed position but the backing is not in contact with the water sealing member. figure,
Fig. 6 is a longitudinal sectional view of the state after the water sealing member has contacted the valve body from the state of Fig. 5, Fig. 7 is a side view showing a part of Fig. 6 in cross section, and Fig. 8 is the state after the water sealing member has contacted the valve body. 7 is a perspective view of part A with the tightening piece removed, and FIG. 9 is a detailed view of the contact portion between the valve body and the water sealing member of another embodiment of the butterfly valve of the present invention. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve body, 6... Water sealing member, 7...
...Latching bar, 8...Tightening piece, 9...Valve stem, 10.
...Groove, 11...Servo motor, 16...Water sealing surface,
17... Backing, 18... Water sealing control member, 19
．． 20... Inclined surface, 21° (1 other person) 1st plan 2ρ f73 Figure 50 Figure 7 3

Claims (1)

[Scope of Claims] 1. A cylindrical valve body, a disc-shaped valve body disposed within the valve body, and a valve body that penetrates the valve body and fixes the valve body, and that is secured to the valve body from outside the valve body. The valve body is provided with a valve shaft formed to be able to be driven to open and close, the valve body being slidably attached to a groove formed on the inner periphery of the valve body with a backing interposed therebetween, and wrapped around the outer periphery of the valve body. A butterfly valve comprising: a water sealing member that can be attached, unwound, pressure-contacted, and separated; and a water-sealing control member that presses and separates the water-sealing member from the outer periphery of the valve body. 2. The butterfly valve according to claim 1, wherein the water sealing member is divided into a plurality of parts in the circumferential direction. 3. The water sealing control member has a slope and is fixed to each end of the water sealing member, and the slopes are opposite to each other at the ends of the adjacent water sealing members to form a square shape. and a locking jaw formed to constitute a section, and a V-shaped cross section with a slope corresponding to the V-shaped section, and by being pushed into the V-shaped section, the water sealing member is moved in the circumferential direction. The butterfly valve according to claim 1, comprising a tightening piece that is tensioned and brought into pressure contact with the valve body, and a servo motor that drives the tightening piece. 4. The water sealing surface between the water sealing member and the valve body is formed by an inclined surface of the water sealing member having a V-shaped groove in cross section in the longitudinal direction of the water sealing member, and a shape of the ■-shaped cross section. The butterfly valve according to claim 1, further comprising inclined surfaces formed on both sides of the valve body so as to be in contact with the inclined surfaces.