JP2551555Y2 - Butterfly valve - 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 which is installed in a fluid passage and rotates around an axis perpendicular to the fluid passage to open and close the fluid passage.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a butterfly valve has a thin plate-shaped valve element (102) fixed to a required portion of a pipe (101) on a rotating shaft (103) orthogonal to the pipe. And is rotatably supported together with the rotating shaft (103).

In this butterfly valve, a rotating shaft (103) is rotated by operating means provided outside the pipe (101), and the valve body (102) is brought into contact with the inner surface of the pipe (101) shown by a solid line. The pipe (101) is opened and closed by rotating between a closed position in contact with the pipe and an open position parallel to the axial direction of the pipe (101).

Conventionally, the following various means have been applied to integrally connect the valve body (102) and the rotary shaft (103).

FIG. 4 is a perspective view showing an example of a conventional butterfly valve.
A notch (105) is formed symmetrically at each location, and a fork-like engaging tool (107) that can be fitted into the notch (105) is provided at each inner end of the pair of left and right rotation shafts (106). The valve body (104) and the pair of rotating shafts (106) are integrally connected by fixedly attaching the fittings (107) to the notches (105), respectively. It was done.

FIG. 5 is a perspective view showing another example of the structure of a conventional butterfly valve, in which a rotating shaft (108) has bearing shafts at both ends.
At the center (110), which has a larger diameter than (109), a disc-shaped valve (11
Form a notch (111) slightly longer than the diameter of 3),
Two screw holes (112) are provided.

The valve body (113) is provided with two bolt holes (114) at diametric positions corresponding to the diametric screw holes (112),
The valve body (113) is mounted on the rotating shaft (108) by two bolts (115).

FIG. 6 is a perspective view showing still another example of the structure of a conventional butterfly valve, in which a disc-shaped valve element (116) formed by pressing is placed in a direction perpendicular to the axis of a rotating shaft (120). A pair of slits (117) facing each other are cut at required intervals, and the plate material of the valve body (116) between the two slits (117) is half of the inner diameter corresponding to the outer diameter of the rotating shaft (120). Circular, bulging to one side to form a semi-bearing (118), while two slits
The plate material of the valve body (116) outside of (117) is semicircular with the same inner diameter, and is bulged to the other side to form a semi-bearing (119).

The rotating shaft (120) has two types of semi-bearings (118) and (11).
9) is inserted and mounted in the bearing hole formed by the above. In this case, the plate material of the valve body (116) uses a relatively thin elastic material, and the interval at which the inner surfaces of the two types of half bearings (118) and (119) face each other is the diameter of the rotating shaft (120). It is somewhat smaller than the above, so that the mounted rotary shaft (120) is pressed and held.

[0010]

The above-mentioned conventional butterfly valve has the following drawbacks in production or use.

In the means shown in FIG. 4, it is necessary to form two notches (105) in the valve body (104) and to attach a locking member (107) to each of the pair of rotating shafts (106). Therefore, there is a problem that the number of manufacturing steps is large and the cost is high.

The means shown in FIG. 5 also includes a support shaft (109) at both ends, a notch (111) formed on the rotating shaft (108), and a screw hole (11).
It takes time and effort to process 2) and to provide bolt holes (114) in the valve body (113), and also requires many bolts (115) for assembly. Hanging,
There is still a problem of high cost.

The means shown in FIG. 6 has a relatively simple structure and requires a small number of assembling operations.
Since the two slits (117) extend to both sides of the rotary shaft (120), there is a problem that when the butterfly valve is set to the closed position, the portion leaks and cannot be completely closed.

That is, if the end of the slit (117) is formed in, for example, a square hole, the slit (11) is used during use.
There is a possibility that a crack may occur from the corner of 7) and the valve body (116) may be damaged. Therefore, both ends of the slit (117) are processed into a shape that is rounded into a semicircle or the like, and therefore, the slit (117) extends outside the outer peripheral surface of the inserted rotating shaft (120) and is opened. Leaks when closed.

An object of the present invention is to provide a butterfly valve which solves the above-mentioned problems.

[0016]

According to the present invention, a plurality of slits are cut in a plate constituting a valve body in a direction perpendicular to an axis of a rotating shaft to be mounted. Forming a bearing hole between the slits and outside the outermost slit in a semicircular shape having an inner diameter corresponding to the outer diameter of the rotating shaft, and alternately in the opposite direction to form a bearing hole; In a butterfly valve having a rotary shaft inserted into a hole, a sealing member having a cross section matching the opening is attached to an opening extending outward of an outer peripheral surface of the rotary shaft in each of the slits. And

It is preferable that the sealing member is formed in a circular plate having a sectional shape matching the opening of the slit, and having a through hole formed in the center thereof through which a rotating shaft is inserted.

[0018]

When a sealing member having a sectional shape matching the opening of the slit is mounted, the opening is closed and leakage from the slit is prevented when the butterfly valve is in the closed position.

The sealing member is formed in a disk shape having a through hole through which a rotation shaft is inserted at the center, and the outer ring-shaped portion has a cross-sectional shape matching the opening of the slit. Can be assembled.

[0020]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, and FIG. 2 is a front view of the same.

The present invention is a butterfly valve shown in FIG. 6 in which the opening of the slit on the outer peripheral surface of the rotary shaft is easily closed. 1) requires a pair of slits (2a) and (2b) in a press-formed disc-shaped valve element (1) in a direction perpendicular to the axis of the rotating shaft (6), as in FIG. The plate material of the valve body (1) between the two slits (2a) and (2b) is swelled to one side with a semicircle having an inner diameter corresponding to the outer diameter of the rotating shaft (6). To form a semi-bearing (3), while two slits (2a)
The plate material of the valve element (1) on the outside of (2b) is semicircular with the same inner diameter, and is bulged to the other side to form half bearings (4) and (5).

The rotating shaft (6) has two types of semi-bearings (3), (4) and (5).
Into the bearing hole formed by the above. As in the case of FIG. 6, the plate material of the valve element (1) uses a relatively thin elastic material, and the facing distance between the inner surfaces of the two types of half bearings (3), (4) and (5). Is somewhat smaller than the diameter of the rotating shaft (6) so that the mounted rotating shaft (6) is pressed and held.

In the present invention, the sealing members (7a) (7) which are respectively fitted to the slits (2a) and (2b) and close the opening of the extension portion.
b) is provided. The sealing members (7a) and (7b) have slits (2a) (2
A disk having a diameter corresponding to the length of the slits (2a) and (2b) after forming a plate having a thickness corresponding to the width of b) by projecting the semi-bearings (3), (4) and (5). And the cross-sectional shape of the periphery is rounded into a semicircle corresponding to the end of the slit (2a) (2b).

In the center of the sealing members (7a) (7b), a rotating shaft (6)
Through holes (8a) and (8b) through which the holes can be inserted.

To assemble the butterfly valve according to the present invention, first, two sealing members (7a) and (7b) are inserted into two slits (2a) and (2b) of the valve body (1), respectively. The through holes (8a) and (8b) are held at positions matching the bearing holes formed by the half bearings (3), (4) and (5).

Next, the rotating shaft (6) is connected to one of the outer half bearings.
(4), and through the through hole (8a) of the first sealing member (7a), into the central half bearing (3). Further, through the through hole (8b) of the second sealing member (7b), the other outer half bearing
(5).

At this time, the interval between the inner surfaces of the two types of semi-bearings (3) and (4) (5) is slightly smaller than the diameter of the rotating shaft (6). ) Is securely held between the half bearings (3), (4) and (5) by the elasticity of the valve body (1).

The two slits (2a) and (2b) are
The openings formed by extending outward from the peripheral surface of (6) are closed by the sealing members (7a) and (7b) having a cross-sectional shape matching with the respective openings. When in the closed position, leakage from the ends of the slits (2a) and (2b) can be prevented.

The closing members (7a) (7) for the slits (2a) (2b)
If the cross-sectional shape of the closing members (7a) and (7b) is slightly smaller than the slits (2a) and (2b) to facilitate the mounting of b), seal them with the slits (2a) and (2b). Although there is a small gap between the members (7a) and (7b), the leakage from this gap is much smaller than the conventional example shown in FIG. is there.

If it is necessary to completely prevent leakage, after assembling the butterfly valve, the closing member (7
a) The joint between (7b) and the valve element (1) may be closed by soldering or welding.

Although the above description has been given based on the illustrated embodiment, the present invention is not limited to the above description.
In particular, in the illustrated embodiment, two slits (2a) and (2b) are provided, and three half bearings (3), (4) and (5) are alternately projected in the opposite direction. May be provided.

[0032]

According to the present invention, the following effects can be obtained. (a) A semi-circular semi-bearing is alternately formed in a plate-shaped valve body in a reverse direction, and a slit formed between the semi-bearings in a butterfly valve having a simple configuration for holding a fitted rotary shaft. Can be prevented from leaking.

(B) It is only necessary to attach a sealing member having a simple shape to a conventional butterfly valve having a simple configuration, and the embodiment can be easily implemented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a butterfly valve according to the present invention.

FIG. 2 is a front view in which the embodiment is assembled.

FIG. 3 is an explanatory diagram of a butterfly valve.

FIG. 4 is a perspective view showing a configuration example of a conventional butterfly valve.

FIG. 5 is a perspective view showing another conventional configuration example.

FIG. 6 is a perspective view showing another conventional configuration example.

[Explanation of symbols]

(1) Valve (2a) (2b) Slit (3) (4) (5) Semi-bearing (6) Rotary shaft (7a) (7b) Sealing member (8a) (8b) Through-hole

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of slits are cut in a plate material constituting a valve body in a direction orthogonal to an axis of a rotation shaft to be mounted, and between the slits and outside of an outermost slit. A semicircular shape having an inner diameter corresponding to the outer diameter of the rotary shaft, and alternately bulging in the opposite direction to form a bearing hole, and the rotary shaft is inserted into the bearing hole. 3. A butterfly valve, wherein a sealing member having a cross section matching each opening is attached to an opening extending outwardly of an outer peripheral surface of a rotary shaft in the above. 2. The sealing member according to claim 1, wherein the sealing member has a sectional shape matching the opening of the slit, and is formed in a disk shape having a through hole through which a rotation shaft is inserted at the center. Butterfly valve.