JPH0331874Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a butterfly valve, and more specifically to a butterfly valve that can enhance the effect of abutting the valve body against the valve body.

<Problems to be solved by conventional technology and ideas> Butterfly valves have been widely used for various fluids such as liquids, gases, and powders.
In particular, in the case of the metal touch type, both the disc-shaped valve body and the valve body with which it comes into contact are finished in a certain shape, and the valve is closed by pressure contact, so the contact area between the outer periphery of the valve body and the valve body is This required extremely high machining accuracy, which led to problems with manufacturing efficiency. In addition, there is a structure in which a rubber body is added to at least the contact surface of the valve body and valve body to reduce the accuracy of the contact part, but this has the disadvantage that it has a much inferior service life compared to the metal touch method. It was hot.

Therefore, in this invention, an attempt is made to provide a valve body that does not require a high level of machining precision at the outer end of the valve body that contacts the valve body, and that can also exert good contact force over a long period of time.

<Means for Solving the Problems> In order to achieve the above object, this butterfly valve has a disc-shaped valve body and a plate-like body connected to the valve body, which is made of an elastic material. A valve body ring is sandwiched therebetween, and the valve body is characterized in that the outer circumferential portion of the valve body is formed into a ring-shaped wave-like uneven stripe, and the outer end portion that contacts the valve body is formed in an arc shape.

<Operation> When the valve body rotates and the outer end and the valve body ring come into contact with the abutment part of the valve body, the ring-shaped undulating grooves formed on the outer periphery of the valve body and the circular arc on the outer end of the valve body Due to the shape and flexibility of the valve body ring, it comes into close contact with the abutting portion of the valve body, and the closing performance of the valve is improved.

<Example> Next, an example of this invention will be described below with reference to the drawings.

In the figure, 10 is a valve box, 11 is a contact portion of the valve box 10, and 20 is a disc-shaped valve body, which is preferably made of a highly rigid metal material such as stainless steel. The valve body 20 is installed so that the valve shaft 30 is eccentric by the distances x and y and rotates due to double eccentricity (Fig. 2), and when the valve shaft 30 is placed at the center without eccentricity (Fig. 3). (Fig.), it is necessary to adopt a contact structure that is different from the upper and lower parts than the other parts, and the peripheral surface that becomes the contact part 11 of the valve box 10 is also separated into left and right parts. The former method, in which the circumferential surfaces are continuous, is more preferable.

The disc-shaped valve body 20 is formed by press molding, and the outer end 21 that contacts the valve box 10 is formed into an arc shape, and the outer peripheral part 22 of the valve body 20 has a shape such that the outer end 21 is shaped like a valve body. It is formed into a ring-shaped wavy concavo-convex strip that is easy to expand, contract, and bend when abutting against the abutting portion 11 of the box 10, so that elastic and tight pressure contact can be performed.

Further, numeral 40 in the figure is a plate-shaped member for holding a ring connected to the valve body 20, and extends from the middle of the valve body 20 to near the outer end 21 of the valve body 20, as shown in FIGS. 2 and 3. In addition to the case where it is provided, it is also possible to connect it by making it approximately the same length as the valve body 20, and it is formed from the same material as the valve body 20 or a different metal material. Reference numeral 50 denotes a valve body ring which is interposed between the outer end 21 of the valve body 20 and the plate-shaped body 40, and is made of an elastic material such as a rubber material or a synthetic resin material that is softer than the valve body 20. This is preferable, and even if the abutting portion 11 of the valve body 10 is made of metal, semi-metal touch type auxiliary abutment can be achieved.

In addition, in practice, both the valve body 20 and the valve box 10 may be made of metal such as stainless steel, and may be of the metal touch type. Part 11
It is also possible to partially form the same synthetic resin material to create a semi-metal touch type structure. Further, the shape of the wavy concave and convex stripes on the outer circumference of the valve body 20 is not limited to the shape shown in the drawings, but can be implemented in various ways.

As for the method of driving the valve shaft 30, known coupling drive methods such as a lock lever type, gear type, cylinder type, and electric type can be adopted.

In the butterfly valve of this invention as described above, when the valve body 20 is rotated to close, the contact between the valve body 10 and the abutting portion 11 is a metal touch method in which both are made of metal, and in addition, the valve body The valve body ring 50 sandwiched between the valve body 20 and the plate-like body 40 can achieve a close and reliable sealing action.

Therefore, the valve closing performance of the valve body 20 and the valve body ring 50 is improved.

<Effects of the invention> According to this invention, the outer periphery of the valve body relative to the valve box abutting part is formed into a ring-shaped wave-shaped uneven strip, and the outer end following this is formed into an arc shape, so that the valve body is Expansion/contraction and flexibility can be imparted to the contact of the outer end to the contact part of the box, and the valve body can be brought into close contact with the valve box contact part. In addition to such metal touch type abutment, a flexible auxiliary abutment of the valve body ring provides a good sealing effect and ensures valve closure.

Therefore, the accuracy of the outer end of the valve body does not require as much sophistication as conventional products, but it can be used easily and is easy to manufacture, and even after repeated use, it maintains a good pressure contact state due to its elasticity and flexibility. It is possible to provide a butterfly valve that is excellent in terms of long-term maintenance.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view, FIG. 2 is a cross-sectional plan view along the - line, and FIG. 3 is a cross-sectional plan view of a modified example. DESCRIPTION OF SYMBOLS 10...Valve box, 11...Abutment part, 20...Valve body, 21...Outer end of the valve body, 22...Outer circumferential part formed by ring-shaped corrugated grooves, 30...Valve stem, 40...
...plate-shaped body, 50...valve body ring.

Claims (1)

[Scope of utility model registration request] It is a disc-shaped valve body, and a valve body ring made of an elastic material is sandwiched between a plate-like body connected to the valve body, and the outer circumference of the valve body is formed into a ring-shaped wave-shaped uneven strip. , a butterfly valve characterized in that an outer end that comes into contact with a valve box is formed into an arc shape.