JP3108402B2 - Butterfly valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve device having a structure in which a flow path is opened and closed by rotating a disk-shaped butterfly valve body.

[0002]

Conventionally, when a butterfly valve and various sensors such as a flow rate sensor and a pressure sensor are attached to various pipes, a butterfly valve device 11 is connected to a short pipe 12 and a long pipe 13 as shown in FIG. , And these three members are fastened together by bolts 14, and the long tube 13 is provided with a sensor mounting socket 15. In this case, the butterfly valve device 11 attaches a metal circular butterfly valve element 17 to a diametrically-rotated valve rotating shaft 16 of an annular valve casing 11a, and has a convex section on the inner peripheral surface of the valve casing 11a. A rubber packing (not shown) is attached, and the butterfly valve element 17 is rotated by the valve rotation shaft 16 to vary the valve opening.
When the valve is closed, the outer peripheral edge of the butterfly valve element 16 comes into contact with the convex rubber seal member, so that the flow path is completely shut off.

However, when the valve is closed, the butterfly valve device 11 having the above-mentioned conventional structure has a metallic butterfly valve element 17.
Has only a line contact with the rubber packing having a convex cross section mounted on the inner periphery of the valve casing 11a.
The contact area of the seal portion at the time of closing the valve is small, and the sealing property is likely to deteriorate while the opening and closing of the butterfly valve element 17 is repeated.
There is a problem in reliability and durability of the seal portion.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a butterfly valve device capable of improving the reliability and durability of a seal portion.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a valve housing tube for forming a flow path, and an interior of the valve housing tube orthogonal to the flow passage. And a disc-shaped butterfly valve element which is rotatably provided via a shaft extending in a direction in which the valve element is housed. On the inner peripheral surface, a spherical concave portion having a shape along the rotation locus of the outer peripheral portion of the butterfly valve body is formed , and the butterfly
A) Open the outer periphery of the valve body with the butterfly valve body closed.
Bullet having an arcuate curved surface part whose peripheral surface is in close contact with the spherical concave surface part
Of the one end side of the valve body storage tube portion.
At the two opposing locations on the peripheral surface, the spherical shape
A valve body insertion groove portion extending to the concave surface portion is formed .

According to the above means, when the butterfly valve element is closed (when the valve is closed), the outer peripheral portion of the butterfly valve element
In this configuration, the arcuate curved surface portion of the elastic member and the spherical concave surface portion on the inner peripheral surface of the valve body storage tube portion are brought into surface contact and sealed. For this reason, the contact area between the outer peripheral portion of the butterfly valve element and the inner peripheral surface of the valve element storage tube in the seal portion is reduced by the conventional linear contact.
It is possible to make it much larger than in the case of touch ,
The reliability of the seal portion can be improved, and the durability can be improved.

[0007]

[0008]

In addition, since the contact area of the seal portion can be increased and the sealing performance can be enhanced in this manner, it is not necessary to particularly greatly deform the elastic member of the butterfly valve to enhance the sealing performance. The driving force at the time of turning can be relatively small.

[0010]

Further, the valve element is inserted into two places of the valve element storage tube.
By forming the groove, when attaching or detaching the butterfly valve body to or from the valve body storage tube, by passing the valve body insertion groove while elastically deforming the elastic member on the outer periphery of the butterfly valve body. , The butterfly valve element can be easily attached and detached. Moreover, since the valve element insertion groove is connected to the spherical concave surface,
In the process of rotating the butterfly valve body to the closed position (spherical recess portion), the valve body insertion groove fluid plays a moderately escape roles, sharp fluctuations in inertia force of the fluid when the valve is closed is reduced, The so-called water hammer phenomenon is also reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, a tubular butterfly valve unit 21 of this embodiment is formed of, for example, one iron pipe, and has a short pipe portion 22 for connecting to an external pipe, and a disc-shaped butterfly valve body. 23 is integrated with a long tube portion 26 to which sensor mounting sockets 25a, 25b, 25c for mounting various sensors such as a flow sensor, a pressure sensor, and a temperature sensor are welded. Rust prevention treatment such as nylon coating and hot-dip galvanizing is applied to all of them. Both ends of the tubular butterfly valve unit 21 (the short pipe section 22 and the long pipe section 26)
Flanges 27 and 28 are welded to the flange ends 27 and 28, respectively, and bolt insertion holes 27a and 28
a is formed.

On the other hand, a sleeve tube 30 is welded to a peripheral edge of an insertion hole 29 formed at an upper portion of the valve body storage tube portion 24, and the valve rotating shaft 3 forming a shaft portion in the sleeve tube 30.
1 (see FIG. 1) is inserted and supported.
A square fitting portion 31a formed at the lower end of the first fitting 1 is fitted into a square hole 32a formed above the metal core 32 of the butterfly valve body 23. Thereby, the upper side of the butterfly valve element 23 is supported by the valve rotation shaft 31 so that rotation can be transmitted. The lower side of the butterfly valve element 23 is rotatably supported by inserting a pin 33 into a round hole 32b formed below the cored bar 32. The pin 33 is inserted into an insertion hole 34 formed at a lower portion of the valve body storage tube portion 24, and a threaded pipe 35 welded to a periphery of the insertion hole 34.
Is secured by tightening the plug 36 in the hole.

On the inner circumferential surface of the valve body housing tube portion 24, a spherical concave portion having a shape along the rotation locus of the outer circumferential portion of the butterfly valve body 23 is provided over the entire circumference at the portion where the butterfly valve body 23 is disposed. 37 is formed by cutting or the like. Correspondingly, the outer peripheral portion of the butterfly valve element 23 has a curvature substantially the same as or slightly larger than the spherical concave surface section 37 so that the outer peripheral surface is in close contact with the spherical concave section 37 when the butterfly valve element 23 is closed. Arc curved surface part 3 of radius
A rubber member 38 as an elastic member having 8a is formed, and the core metal 32 is insert-molded at the center portion of the rubber member 38 so as to increase the strength of the butterfly valve body 23 as a whole.

On the other hand, two valve body insertion grooves 39 extending from the opening edge to the spherical concave surface 37 are formed on opposite sides of the inner surface of the short tube portion 22 and the valve body housing tube portion 24 by cutting or the like. (See FIGS. 2 and 3). By forming the groove width of the valve element insertion groove portion 39 to be slightly larger than the thickness of the butterfly valve element 23, the valve element insertion groove portion 39 is formed.
The butterfly valve element 23 can be easily taken in and out through the through hole.

In this embodiment, the connection square tube portion 41 of the operating lever 40 is fitted into a square fitting portion 31b formed at the upper end of the valve rotation shaft 31. Thereby, when the operation lever 40 is rotated 90 ° in the horizontal direction, the valve rotation shaft 31 and the butterfly valve body 23 are integrally rotated by 90 °.
It rotates to open / close the flow path. A lock mechanism 42 is provided at the upper end of the sleeve tube 30 to lock the butterfly valve element 23 between the open position and the closed position. This locking mechanism 42 is used for the sleeve tube 3
0, and a middle plate 4 fitted to the square fitting portion 31b of the valve rotation shaft 31.
4 and a wing bolt 45 for fixing the middle plate 44 to the lower plate 43 at the open position and the closed position. On the lower plate 43, as shown in FIG. 3, an upper plate 47 is fixed by bolts 48 via a collar 46, so that the middle plate 44 can rotate between the upper and lower plates 47, 43. In addition, as shown in FIG. 1, the connecting rectangular tube portion 41 of the operation lever 40 is supported on the upper plate 47.

According to the tubular butterfly valve unit 21 configured as described above, two valve element insertion grooves 39 extending from the opening edge to the spherical surface are formed on both inner peripheral surfaces of the short tube portion 22. In addition, since the outer peripheral portion of the butterfly valve element 23 is formed of the rubber member 38, the valve element storage tube portion 24
Without removing the short pipe section 22 from the
The butterfly valve element 23 can be inserted into or removed from the valve element storage tube section 24 through the valve element insertion groove 39 while elastically deforming the outer peripheral portion (the rubber member 38) of the third element 3.

Therefore, when assembling the butterfly valve element 23 to the valve element accommodating tube portion 24, the butterfly valve element 23 is inserted through the valve element insertion groove 39 while elastically deforming the outer peripheral portion (rubber member 38) of the butterfly valve element 23. Valve body storage tube part 24
After that, the valve rotation shaft 31 is inserted into the sleeve tube 30 to fit the square fitting portion 31 a of the valve rotation shaft 31 into the square hole 32 a of the core metal 32 of the butterfly valve body 23, and Is inserted into the insertion hole 34 of the valve body storage tube portion 24, and the tip of the pin 33 is inserted into the round hole 32 b of the cored bar 32.
And screw the plug 36 into the threaded tube 35,
Assembly work is completed.

On the other hand, due to a failure or the like, the tubular butterfly valve unit 21 is removed from the pipe and the butterfly valve body 23 is removed.
Is replaced, the butterfly valve element 23 can be removed by pulling out the valve rotation shaft 31 and the pin 33. Thereafter, the butterfly valve element 23 may be pulled out from the valve element storage tube 24 through the valve element insertion groove 39 while elastically deforming the outer peripheral portion (rubber member 38) of the butterfly valve element 23.

According to the embodiment described above, the short pipe portion 22 and the long pipe portion 26 are integrated with the valve body storage tube portion 24. The labor for assembling the long pipe portion 26 is omitted, and the piping work is facilitated.
In addition, even when the butterfly valve element 23 needs to be detached and attached due to a failure or the like, the short pipe section 22 can be connected to the valve element storage pipe section 24.
It is not necessary to remove the long tube section 26 and the maintenance work is easy.

On the inner peripheral surface of the valve body housing tube portion 24, a spherical concave portion 37 having a shape along the rotation locus of the outer peripheral portion of the butterfly valve body 23 is formed, and the outer peripheral portion of the butterfly valve body 23 is Since the rubber member 38 having the arcuate curved surface portion 38a is used, when the valve is closed, the spherical concave portion 37 of the valve housing tube portion 24 and the spherical surface portion 38a of the outer peripheral portion of the butterfly valve body 23 come into surface contact and seal. As a result, the contact area between the two becomes much larger than in the past, so that the reliability of the seal portion can be significantly increased, and the durability can be improved.

In addition, since the contact area of the seal portion can be increased and the sealing performance can be enhanced, it is not necessary to particularly greatly deform the rubber member 38 of the butterfly valve body 23 in order to enhance the sealing performance. The driving force for rotating the body 23 can be relatively small. In addition, since the spherical concave portion 37 formed in the valve body storage tube portion 24 has a spherical shape extending over the entire circumference, the workability is superior to that having a linear portion.

Further, since the valve element insertion groove 39 on the inner peripheral surface of the short pipe part 22 is connected to the spherical concave part 37 of the valve element storage pipe part 24, the butterfly valve element 23 is closed at the valve closing position (spherical concave part 37). 2), the two valve element insertion grooves 39 play a role of appropriately releasing the fluid, so that the sudden fluctuation of the inertia force of the fluid when the valve is closed is reduced, and the water hammer phenomenon is also reduced.

In the above embodiment, the short pipe portion 22, the valve housing tube portion 24 and the long pipe portion 26 are formed by one iron pipe, so that they are compared with those of the conventional structure formed by casting. Thus, there are advantages that the weight can be reduced, the productivity is good, and the cost can be reduced. However, the present invention may employ a configuration in which a spherical concave portion is formed on the inner peripheral surface by cutting or the like using a casting-made pipe member, and even in this case, the intended purpose of the present invention can be sufficiently achieved. . Of course,
The present invention is not limited to an iron pipe and a cast pipe, and it goes without saying that another metal pipe such as a stainless steel pipe may be used.

In the above-described embodiment, the short tube portion 22, the valve body storage tube portion 24, and the long tube portion 26 are integrally formed. The corresponding portion is formed by one pipe member, and the portion corresponding to the long tube portion 26 is integrated with the tube portion by welding or the like, or the above three portions are formed separately and welded to each other. May be integrated.

Further, the butterfly valve element 23 of the above embodiment is used.
Although the strength of the butterfly valve body 23 as a whole is increased by insert-molding the core metal 32 in the center portion of the rubber member 38, in the case of a small butterfly valve body, the entire butterfly valve body is You may make it form with a rubber member.

In addition, the present invention provides a sensor mounting socket 25 for appropriately changing a rotation operation mechanism and a lock mechanism of the valve rotation shaft 31 or mounting a sensor.
a, 25b, 25c, etc.
It goes without saying that various changes can be made without departing from the scope of the invention.

[0028]

As is apparent from the above description, according to the butterfly valve device of the first aspect, when the butterfly valve element is closed, the elastic portion at the outer peripheral portion of the butterfly valve element.
The arcuate curved surface portion of the material and the spherical concave surface portion on the inner peripheral surface of the valve body storage tube portion are brought into surface contact and sealed. For this reason,
The contact area in the sealing portion of the outer peripheral portion and the valve housing tube portion inner peripheral surface of the butterfly valve body, compared with the conventional line contact
Thus, it is possible to increase the reliability of the seal portion and improve the durability.

[0029]

In addition, since the contact area of the seal portion can be increased and the sealing performance can be enhanced in this way, it is not necessary to particularly greatly deform the elastic member of the butterfly valve to enhance the sealing performance. The driving force at the time of turning can be relatively small.

Further, the valve body is inserted into two places of the valve body storage tube.
By forming the groove, when attaching or detaching the butterfly valve body to or from the valve body storage tube, by passing the valve body insertion groove while elastically deforming the elastic member on the outer periphery of the butterfly valve body. , The butterfly valve element can be easily attached and detached.

[0032] Moreover, since the valve body insertion groove is connected to the spherical recess portion, in the process of rotating the butterfly valve body to the closed position (spherical recess portion), the role of the valve body insertion groove portion escape moderately fluid As a result, the rapid fluctuation of the inertia force of the fluid when the valve is closed is reduced, and the so-called water hammer phenomenon is also reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a main part showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view of the entire tubular butterfly valve unit with a butterfly valve element removed.

FIG. 3 is a left side view of a tubular butterfly valve unit.

FIG. 4 is a top view of a lock mechanism portion of the operation lever.

FIG. 5 is a front view of a conventional butterfly valve unit.

[Explanation of symbols]

In the drawing, 21 is a tubular butterfly valve unit, 22 is a short pipe portion, 23 is a butterfly valve body, 24 is a valve body storage tube portion, 26
Is a long tube portion, 31 is a valve rotating shaft (shaft portion), 32 is a metal core, 37 is a spherical concave portion, 38 is a rubber member (elastic member),
38a is an arcuate curved surface portion, 39 is a valve element insertion groove portion, 40 is an operation lever, and 42 is a lock mechanism.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-99346 (JP, A) JP-A-62-230443 (JP, A) Fully open 1980-64570 (JP, U) Really open 4 27268 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 27/02 F16K 1/22 F16K 1/226 F16K 47/02

Claims (1)

(57) [Claims] 1. A valve body storage pipe part forming a flow path, and provided rotatably inside the valve body storage pipe part via a shaft part extending in a direction perpendicular to the flow path. A butterfly valve device having a disc-shaped butterfly valve body that opens and closes the flow path by rotation. The butterfly valve device includes: an inner peripheral surface of the valve body housing pipe portion; forming Then the spherical concave portion of the shape
In both cases, the outer peripheral portion of the butterfly valve body is
A circle whose outer peripheral surface is in close contact with the spherical concave portion when the valve element is closed.
It is constituted by an elastic member having an arcuate surface portion, and is opposed to the inner peripheral surface on one end side of the valve body storage tube portion.
At two locations, extending from the opening edge to the spherical concave surface
A butterfly valve device having a valve body insertion groove formed therein .