JP2549395Y2 - 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 a pipe (101) so that a 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 locking tool (107) that can be fitted into the notch (105) is fixed inside each of a pair of left and right rotation shafts (106). And the valve body (104) and the pair of rotating shafts (106) are integrally connected by fitting each locking tool (107) into the notch (105). Things.

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 positions on the diameter corresponding to the screw holes (112), and the two bolts (115) are used for the valve body (113). Is mounted on the rotating shaft (108).

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.

[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 at both ends attached to the rotation shaft.
(109), forming a notch (111), machining a screw hole (112), and providing a bolt hole (114) in the valve body (113). )
There is a problem that the number of parts is large, the production is troublesome, and the cost is also high.

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 rectangular shape, cracks occur in the plate material of the valve body (116) from the corner of the slit (117) during use, and the breakage occurs. There is a possibility that. Therefore, both ends of the slit (117) need to be processed into a shape that is rounded into a semicircle or the like, and therefore, the slit (117) is
Will extend outwardly of the outer peripheral surface, and will cause leakage when closed.

An object of the present invention is to provide a butterfly valve which solves these conventional problems.

[0016]

In order to achieve the above-mentioned object, according to the present invention, a through hole is formed in the center of a plate material constituting a valve body, and the outer diameter of a rotary shaft is formed in the plate material on both the left and right sides of the through hole. A semi-circular bearing having an inner diameter corresponding to that of a semi-bearing portion bulging to one side is formed, and the vertical dimension is larger than the opening dimension of the upper and lower edges of the through hole, and the valve element The locking piece provided with a semi-circular semi-circular part bulging in the opposite direction to the semi-bearing part is rotated so as to cover the through hole of the valve body and the semi-bearing part of the locking piece rotates. It is characterized in that it is provided on one side surface of the plate material so as to be in contact with the outer peripheral surface of the shaft.

[0017]

When the locking piece is provided in close contact with the side surface of the plate of the valve body, the bearing is formed by a combination of a semi-bearing part protruding from the valve body and a semi-bearing part bulging in the opposite direction to the locking piece. A hole is formed, and the three members are integrally fixed while closing a through hole or the like formed in the valve body by inserting a rotary shaft into the bearing hole.

[0018]

FIG. 1 is an exploded perspective view showing the structure of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing an assembled state.

The valve body (1) is press-formed into a disk shape using a plate material having an appropriate thickness, and a rectangular through hole is formed in the center thereof.
(2) and slits (2a) are cut in both side edges thereof. The vertical opening size of the through hole (2) is larger than the diameter of the rotating shaft (7), and the horizontal opening size is
It is appropriate that the diameter is about 1/2 to 1/3 of the diameter of the valve element (1).

A pair of half bearings (3) and (4) are formed in the left and right plate members of the through hole (2). The semi-bearings (3) and (4)
The valve body (1) is provided with a substantially semicircular cross-sectional shape on the same diameter, and has an inner diameter corresponding to the outer diameter of the rotary shaft (7) to be inserted.

In this embodiment, the locking piece (5) is formed by using an elastic plate material, and the vertical dimension is made larger than the vertical opening dimension of the through hole (2) and the slit (2a). The left and right dimensions are equal to, preferably slightly smaller than, the left and right dimensions of the through hole (2).

At the center of the locking piece (5), a semi-bearing part (6) having a semicircular cross section pointing in the left-right direction is formed. Semi-bearing
The inner diameter of (6) is the same as that of the semi-bearing portions (3) and (4) of the valve body (1).
Dimensions corresponding to the outer diameter of the rotating shaft (7), semi-bearing parts (3) (4)
It is bulged in the opposite direction.

As shown in FIG. 2, the locking piece (5) is brought into contact with the valve body (1) from the side where the half bearings (3) and (4) are formed, and the half bearing (6) is When projecting to the opposite side through the through hole (2),
When the upper and lower closing pieces (5a) and (5a) of the locking piece (5) abut on the right side of the valve body (1), they are prevented from falling off to the left and the through-hole (2)
And the slit (2a) are covered, and the semi-bearing part of the valve body (1)
(3) The valve body is formed by (4) and the semi-bearing part (6) of the locking piece (5).
Rotation axis (7) with the contact surface between (1) and locking piece (5) as the boundary
A bearing hole is formed to receive the bearing.

In this case, two types of semi-bearing portions (3) (4) and (5)
The distance between the inner surfaces of the locking pieces (5) and (4) was made slightly smaller than the diameter of the rotating shaft (7), and the locking piece (5) was strongly deformed in the direction in which the semi-bearing portion (6) protruded. In this state, the rotary shaft (7) is inserted.

Then, the rotating shaft (7) is moved by the resilient force of the locking piece (5) without using any special fixing means such as welding.
The semi-bearings (3), (4) and (5) of the kind are fixed between them.

In the present invention, as shown by the imaginary line in FIG. 2, the locking piece (5) is simply attached to the surface of the valve body (1) on the side opposite to the half bearings (3) and (4). Of course, it may be fixed by welding or the like so as to be in close contact with the outer peripheral surface of the rotating shaft (7).

[0027]

According to the present invention, the following effects are obtained. (a) Since only two parts, the valve element and the locking piece, are securely held on the rotating shaft and the through holes and the like are closed, the amount of fluid leakage can be reduced.

(B) It can be assembled very easily without using tools and the like.

[Brief description of the drawings]

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

FIG. 2 is a vertical sectional view of the assembled example.

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 (2) Through-hole (2a) Slit (3) (4)
Half bearing (5) Locking piece (5a) Blocking piece (6) Half bearing (7) Rotary shaft

Claims (3)

(57) [Scope of request for utility model registration] 1. A through hole is formed in the center of a plate material constituting a valve body, and the plate material on both the left and right sides of the through hole bulges to one side in a semicircle having an inner diameter corresponding to the outer diameter of the rotating shaft. While forming a semi-bearing part, the dimension in the up-down direction is larger than the opening dimension of the upper and lower edges of the through hole, and bulges in the center to a semi-circle of the same diameter opposite to the semi-bearing part of the valve body. The locking piece provided with the semi-bearing portion, so as to cover the through hole of the valve body, and so that the inner peripheral surface of the semi-bearing portion of the locking piece abuts the outer peripheral surface of the rotating shaft, on one side of the plate material Butterfly valve characterized by being provided. 2. The half-bearing portion of the locking piece is inserted into the through-hole from the half-bearing portion side of the valve body, with the left-right dimension of the locking piece being slightly smaller than the opening size of the left and right edges of the through-hole. The butterfly valve according to claim 1, wherein the upper and lower ends of the locking piece abut against the side surface of the valve body on the side of the semi-bearing portion, and are locked. 3. At least one of the valve body and the locking piece is formed of an elastic plate material, and the locking piece is brought into contact with the through hole of the valve body. 3. The butterfly valve according to claim 2, wherein a distance between the opposed inner surfaces is slightly smaller than a diameter of the rotating shaft.