JPH066838U - Butterfly valve - Google Patents

Abstract

(57) [Summary] [Purpose] In a butterfly valve with a simple structure in which the valve element is made of sheet metal, to prevent leakage from a slit cut in the valve element. [Structure] A plurality of slits 2a, 2b are cut in a valve body 1, and plate materials of the valve body on both sides of each slit are alternately bulged in opposite directions to form a bearing hole into which a rotary shaft 6 is inserted. In the butterfly valve described above, each slit has an opening formed by extending outward from the outer peripheral surface of the rotary shaft, and closing members 7a and 7b having a cross-sectional shape matching the opening are attached to the opening. The closing member is
It is formed in a disk shape, through which the rotary shaft can be inserted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a butterfly valve that is installed in a fluid conduit and opens and closes the conduit by rotating around an axis orthogonal to the conduit.

[0002]

[Prior art]

 As shown in FIG. 3, a butterfly valve normally has a thin plate-shaped valve element (102) fixed to a rotary shaft (103) orthogonal to the pipe line at a required position of the pipe line (101). It is rotatably supported with (103).

In this butterfly valve, the rotating shaft (103) is rotated by an operating means provided outside the conduit (101), and the valve body (102) is moved to the inner surface of the conduit (101) indicated by the solid line. The pipe line (101) is opened and closed by rotating the pipe line (101) into an abutting closed position and an open position parallel to the axial direction of the pipe line (101).

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

FIG. 4 is a perspective view showing an example of a conventional butterfly valve, in which notches (105) are symmetrically formed at two opposite positions on the peripheral edge of a disc-shaped valve body (104). At each inner end of the pair of left and right rotary shafts (106), a fork-shaped locking tool (107) that can fit in the notch (105) is fixed, and each locking tool (107) is cut. The valve body (104) and the pair of rotating shafts (106) are integrally connected by fitting in the notches (105).

FIG. 5 is a perspective view showing another configuration example of a conventional butterfly valve, in which the rotating shaft (108) has a circular shape in a central portion (110) having a larger diameter than the supporting shaft portions (109) at both ends. A notch (111) having a length slightly larger than the diameter of the plate-shaped valve body (113) is formed, and two screw holes (112) are provided.

The valve body (113) is provided with two bolt holes (114) at diametrical positions which are aligned with the diametrical screw holes (112), and the two bolts (115) allow the valve body (113) to move. (113) is attached to the rotating shaft (108).

FIG. 6 is a perspective view showing still another configuration example of a conventional butterfly valve, in which a disc-shaped valve body (116) molded by a press is mounted in a direction orthogonal to the axis of the 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) has an inner diameter corresponding to the outer diameter of the rotating shaft (120). A semi-circular shape is formed by bulging to one side to form a semi-bearing (118), while the plate material of the valve body (116) outside the two slits (117) is a semi-circular shape with the same inner diameter and the other side. Each side is bulged to form a half bearing (119).

The rotating shaft (120) is fitted and mounted in a bearing hole formed by two kinds of half bearings (118) and (119). In this case, the plate material of the valve body (116) is made of a relatively thin elastic material, and the distance between the inner surfaces of the two kinds of half bearings (118) and (119) facing each other is set to be straight between the rotary shaft (120). It is slightly smaller than the diameter so that the attached rotating shaft (120) can be crimped and held.

[0010]

[Problems to be solved by the device]

 The above-mentioned conventional butterfly valve has the following drawbacks in manufacture and use.

The means shown in FIG. 4 requires two cutouts (105) to be formed in the valve body (104) and a lock (107) to be attached 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.

In the means shown in FIG. 5, the rotary shaft (108) is also provided with bearing shaft portions (109) at both ends, notches (111), screw holes (112), and a valve body (113). ) Also needs a lot of labor such as providing a bolt hole (114), and the bolt (115) is required for assembly. .

The means shown in FIG. 6 has a relatively simple structure and requires less assembly work, but in the assembled state, the two slits (117) extend to both sides of the rotary shaft (120). Therefore, when the butterfly valve is set to the closed position, there is a problem that leakage occurs in this part and the butterfly valve cannot be completely closed.

That is, if the end of the slit (117) is formed as a square hole, for example, a crack is generated from the corner of the slit (117) during use, and the valve body (116) is damaged. There is something to do. Therefore, both ends of the slit (117) are machined into a rounded shape such as a semicircle, and therefore the slit (117) is extended to the outside of the outer peripheral surface of the inserted rotary shaft (120). Since it is open, it will leak when closed.

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

[0016]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention cuts a plurality of slits on a plate material constituting a valve body in a direction orthogonal to an axis of a rotating shaft to be mounted, between slits, and. The outer plate of the outermost slit and the outermost slit are alternately bulged in a semicircular shape having an inner diameter corresponding to the outer diameter of the rotating shaft in opposite directions to form a bearing hole, and the rotating shaft is fitted into the bearing hole. The butterfly valve that is inserted is characterized in that a sealing member having a cross section that matches each opening is attached to the opening that extends outward of the outer peripheral surface of the rotating shaft in each slit.

It is desirable that the sealing member has a cross-sectional shape that matches the opening of the slit, and is formed into a circular plate having a through hole formed at the center for inserting the rotation shaft.

[0018]

[Action]

 If a sealing member with a cross-sectional shape that matches the opening of the slit is attached, 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 the rotary shaft is inserted, and the ring-shaped portion on the outside has a cross-sectional shape that matches the opening of the slit. It can simply be assembled.

[0020]

【Example】

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

Among the above-mentioned conventional means, the present invention is the butterfly valve shown in FIG. 6, in which the opening of the slit outside the peripheral surface of the rotating shaft is simply closed. Similar to FIG. 6, (1) is a press-formed disc-shaped valve body (1) having a pair of slits (2a) (2b) oriented in a direction orthogonal to the axis of the rotating shaft (6). Cut at the required intervals and expand the plate material of the valve body (1) between the two slits (2a) and (2b) to one side with a semicircular shape with an inner diameter corresponding to the outer diameter of the rotating shaft (6). To form the semi-bearing (3), while the plate material of the valve body (1) outside the two slits (2a) and (2b) is a semi-circular shape with the same inner diameter and is placed on the other side. The half bearings (4) and (5) are formed by bulging each.

The rotating shaft (6) is fitted and mounted in a bearing hole formed by two kinds of half bearings (3), (4) and (5). As in the case of FIG. 6, the plate material of the valve body (1) is made of a relatively thin elastic material, and the inner surface of the two types of half bearings (3), (4) and (5) faces each other. Is slightly smaller than the diameter of the rotary shaft (6) so that the mounted rotary shaft (6) can be crimped and held.

In the present invention, the sealing members (7a) and (7b) which are fitted into the slits (2a) and (2b) and close the openings of the extending portions are provided. The sealing members (7a) and (7b) are made of a plate material having a thickness corresponding to the widths of the slits (2a) and (2b) formed by protruding the half bearings (3), (4) and (5). It is formed into a disk shape having a diameter corresponding to the length of the grate (2a) (2b), and the cross-sectional shape of the peripheral edge is rounded into a semicircle corresponding to the ends of the slits (2a) (2b).

Through holes (8a) and (8b) through which the rotary shaft (6) can be inserted are provided at the centers of the sealing members (7a) and (7b).

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

Then, the rotary shaft (6) is fitted into one outer half bearing (4) and passed through the through hole (8a) of the first sealing member (7a) to the center half bearing (3). Insert it. Further, it is fitted into the other outer half bearing (5) through the through hole (8b) of the second sealing member (7b).

At this time, the distance between the inner surfaces of the two kinds of half bearings (3) and (4) and (5) facing each other is set to be 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).

Further, the openings formed by the two slits (2a) and (2b) extending outward of the peripheral surface of the rotating shaft (6) are sealing members having a cross-sectional shape that matches the respective openings. Since it is blocked by (7a) and (7b), it is possible to prevent leakage from the ends of the slits (2a) and (2b) when the butterfly valve is in the closed position in the pipeline.

In order to easily attach the closing members (7a) and (7b) to the slits (2a) and (2b), the cross-sectional shape of the closing members (7a) and (7b) is slightly larger than that of the slits (2a) and (2b). When formed small, a small gap is created between the slits (2a) (2b) and the sealing members (7a) (7b), but the leakage from this gap is larger than that of the conventional example in FIG. And much smaller, and in most cases not a problem.

If it is necessary to prevent leakage completely, after assembling the butterfly valve, the joints between the closing members (7a) (7b) and the valve body (1) are soldered or welded. It may be closed by, for example.

Although the above description is based on the illustrated embodiment, the present invention is not limited to the above description. Particularly, in the illustrated embodiment, two slits (2a) and (2b) are provided and three half bearings (3), (4) and (5) are alternately protruded in the opposite direction. The slit and the half bearing may be provided.

[0032]

[Effect of device]

 The present invention has the following effects. (a) In a butterfly valve with a simple structure in which semicircular semi-bearings are alternately formed in opposite directions on a plate-shaped valve body to hold the inserted rotary shaft, they are formed between the semi-bearings. Leakage in the slit can be prevented.

(B) The conventional butterfly valve having a simple structure only needs to be provided with a sealing member having a simple shape, and the butterfly valve can be easily implemented.

[Brief description of drawings]

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

FIG. 2 is a front view in which the same 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 example of the conventional configuration.

[Explanation of symbols]

(1) Valve body (2a) (2b) Slit (3) (4) (5) Half bearing (6) Rotating shaft (7a) (7b) Sealing member (8a) (8b) Through hole

Claims (2)

[Scope of utility model registration request] 1. A plate material constituting a valve body, wherein a plurality of slits are cut in a direction orthogonal to an axis of a rotating shaft to be mounted, and the plate material is provided between the slits and outside the outermost slit. In a butterfly valve in which a bearing hole is formed by alternately bulging in a semicircular shape having an inner diameter corresponding to the outer diameter of the rotating shaft in opposite directions, and the rotating shaft is fitted in the bearing hole. A butterfly valve, wherein a sealing member having a cross section matching each opening is attached to the opening extending outward of the outer peripheral surface of the rotating shaft. 2. The sealing member is formed in a disk shape having a cross-sectional shape that matches the opening of the slit and having a through hole at the center through which the rotary shaft is inserted. Butterfly valve.