JPS5824703Y2 - Chiyo-shaped valve drive device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drive device for opening and closing the valve plate of a butterfly valve.

In a butterfly valve, at least one of the valve stems fixed to the valve plate disposed inside the valve body protrudes from the valve needle, and the valve plate is opened and closed by rotating a handle, lever, etc. attached to this protruding part. However, since it is impossible to check the opening degree of the valve plate with this alone, various mechanisms have been proposed in the past that are equipped with a valve plate opening indication mechanism.

Figure 1 shows a known valve plate opening indicating mechanism of this type.
A main body 1 having a matching flange portion is fixed to a flange portion formed on a valve body (not shown) and supporting a protruding valve shaft.

The body is formed as a substantially hollow cylinder and has two axially opposed slits 11, 12 at diametrically opposite positions.
is formed.

Inside the body 1, there is a shoulder portion 13 whose upper end is formed on the body 1.
Further, there are provided cylinder members 5 whose lower ends are respectively supported by plate members 14 arranged and fixed in the main body 1 and are provided so as to be rotatable in a fixed position.

A hollow portion 53 is further formed in this cylinder member 5, and a polygonal hole 54 is formed in the lower part.

A polygonal portion 21, which is formed on the protruding portion of the valve needle of the valve stem 2 and is aligned with the polygonal hole, is inserted into the polygonal hole 5A.

A threaded rod 3 is inserted coaxially with the valve shaft 2 into a through hole formed at the upper end of the main body 1, and the threaded portion of this threaded rod passes through the hollow portion 53 of the cylinder member 5.

In the illustrated embodiment, the lower end of the threaded rod 3 is loosely fitted into a polygonal hole 54 of the cylinder member so that it can rotate within this hole.

Further, the screw rod 3 is formed with a large diameter portion 32, and the upper surface of the large diameter portion 32 is covered with a lid 8 to prevent the screw rod from escaping outward.

An elevating piece 4 is fitted into the hollow portion 53 of the cylinder member 5 of the threaded rod 3 .

This lifting piece 4 has protrusions 41 and 42 at diametrically opposed positions.
are integrally formed, and these protrusions 41 and 42 are slidably protruded into the sills N1 and 12 of the main body, respectively.

Furthermore, spiral holes 51 and 52 with a large pitch are formed in the peripheral wall of the cylinder member 5, and the protrusions 41 and 42 of the piece 4 are loosely fitted into these wire holes 51 and 52, respectively. ing.

Since the illustrated drive mechanism is configured in this way, when the top protrusion of the threaded rod 3 is rotated by a suitable means such as a handle or a lever, the threaded rod will move due to the presence of the large diameter portion 32 as described above. Therefore, the lifting piece 4 that is engaged with the lifting piece 4 moves up and down within the hollow portion 53 of the cylinder member 5.

That is, since the protrusions 41 and 42 of the bridge are fitted into the retainers N1 and 12 of the fixed main body 1 and prevented from rotating as described above, they do not rotate as the screw rod 3 rotates. It will go up and down.

On the other hand, since the length portions 41 and 42 are also engaged with the linear holes 51 and 52 in the cylinder member 5, the cylinder member 5 rotates along the linear holes 51 and 52 as the piece 4 moves up and down. It will move.

Since the valve shaft 2 is engaged with the lower end of most cylinder members,
As the cylinder member rotates, the valve shaft 2 rotates, and accordingly, a valve plate (not shown) attached to the valve shaft 2 opens and closes.

A drive mechanism having such a configuration is known as described above, and includes a transparent plate 61, 62 attached to the sulin Nl, 12 and a scale attached thereto so that the position of the protrusion of the piece can be checked from the outside. I think it is easy to understand that the opening degree of the valve can be determined by

Such a drive mechanism is advantageous in that it can precisely control the opening degree of the valve plate, but for example, when the screw rod 3 is rotated to raise the piece 4, the piece may reach its top. Then, as can be seen from FIG. 1, the part of the main body 1 located between the large diameter part 32 of the screw rod and the top surface of the printing press is firmly clamped between them, and then the screw rod is removed. It is often extremely difficult to rotate and lower the piece.

If this happens, it may become impossible to rotate without the use of an auxiliary tool in the case of manual operation, or damage may occur if a motor or the like is used.

In order to prevent such inconvenience, the present invention, as shown in FIG. The feature is that it is made of elastic resin/guar.

By disposing a rod with appropriate elasticity in this part, when the screw rod 3 is rotated and the piece 4 is raised, the piece reaches the upper end and comes into contact with the contact surface of the main body. Since the rotational torque of the screw rod increases in a way that is clearly noticeable to the operator, it is possible to easily prevent a strong engagement between the bridge, the main body, and the screw rod.

FIG. 2 shows another embodiment of the present invention, in which an elastic ring 9 is arranged on the top surface of the piece 4.

In this case, as in the case shown in FIG. 1, it is easy to understand that the piece can be operated so as not to come into extreme contact with the contact surface of the main body 1.

Furthermore, although not shown, the elastic ring can be placed not on the top surface of the printing press but on the side of the main body 1 that comes in contact with the pieces, as shown by the reference numeral in FIG. 2. It is also possible to use sublime glaze instead.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a drive device according to the present invention, and FIG. 2 is a sectional view of main parts showing another embodiment. In the drawings, reference numeral 1: Main body, 2: Valve shaft, 3: Screw rod, 4: Lifting piece, 5: Cylinder member, 7, 9.
9'...Elastic ring.

Claims (1)

[Claims for Utility Model Registration] A hollow cylinder member 5 that non-rotatably engages with the valve stem 2 of a butterfly valve is rotatably installed in a hollow body 1 fixed to a fixed part such as a valve body, The threaded portion of the threaded rod 3, which is disposed on the same axis as the valve shaft 2 and is disposed in the main body 1 so that it cannot move up and down but can only rotate, is located in the hollow part of the cylinder member 5, and the screw A lifting piece 4 is engaged with the threaded portion of the rod 3, and a protrusion 41.4:2e is provided at a position opposite to the lifting piece 4 in the diametrical direction, a linear sulin N1 is formed at a position facing the main body 1 in the diametrical direction 12, and a large pitch parallel linear hole 51.5 provided in the cylinder member 5.
2 so that the rotation of the screw rod 3 is converted into the vertical movement of the lifting piece, which is further converted into the rotation of the cylinder member 5 and therefore the valve shaft 2. A driving device for a butterfly valve, wherein an elastic member is attached to an end face of the lifting piece, which is in contact with a part of the main body supporting a threaded rod when the lifting piece is at its uppermost position.