JPH022125Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention (field of industrial application) This invention relates to an opening indicating mechanism for rotary valves such as butterfly valves.

(Prior Art and Issues to be Solved) In the case of rotary valves such as butterfly valves, the position of the valve member cannot be seen from the outside, so various means have been proposed to allow the valve opening degree to be observed from the outside. .

FIG. 2 shows an example of a structure in which the valve opening degree can be monitored from the outside, particularly from the side.

In the figure, a hollow member 10 having vertical slits 10a, 10b formed on the sides is fixed to a trunnion VF of a valve V having a valve member (not shown) that rotates to open and close inside.

Inside the hollow member 10, a cylinder member 15 having large pitch diagonal slits 15a, 15b around the periphery is disposed so as to rotate together with the valve shaft 11. A drive shaft 12 is arranged inside the valve shaft 11 and concentrically.

Near the lower end of the drive shaft 12, the cylinder member 1
A screw 13 is cut into the inner portion of 5, and a piece 14 is screwed into this screw portion 13.

The piece 14 is formed with protrusions 14a and 14b, and the protrusion 14a is connected to the slits 10a and 15a.
In addition, the protrusions 14b are engaged with the slits 10b and 15b, respectively.

With this structure, when the drive shaft 12 is rotated, the piece 14 is restrained by the vertical slits 10a and 10b and is displaced in the vertical direction.
This allows the piece 14 to pass through the diagonal slit 15.
a, 15b, the cylinder 15
rotates in accordance with the pitch provided therein, and in conjunction with this, the valve shaft 11 also rotates and the valve member (not shown) also rotates.

Although this configuration allows the opening and closing of the valve to be observed from the side, it has the disadvantage that it cannot be seen from the top.

In order to avoid such drawbacks, for example, as seen in Japanese Patent Application Laid-Open No. 53-54322, a large pitch diagonal slit, a vertical slit, and a rod body that engages with both of them are proposed. A system has been proposed in which the valve opening degree can be observed from the top surface, that is, from the axial direction of the valve stem.

However, it must be said that this type of device also has a drawback in that it is impossible to monitor from the side.

The present invention has been developed in view of the above-mentioned current situation, and it is possible to monitor this type of valve from both above and from the side. The object of the present invention is to provide a valve opening indicating mechanism that allows the valve opening degree to be significantly increased.

(2) Structure of the invention (technical means for solving the problem and its effects) In order to achieve the above purpose, the invention consists of a hollow body fixed to an immovable part such as the valve body of a rotary valve;
A cylinder disposed within the main body so as to be rotatable only; and a drive shaft disposed within the cylinder concentrically with the valve shaft and having a thread formed inside the cylinder, the drive shaft being screwed into the threaded portion. The protrusion formed on the piece to
The slits formed in the main body and extending in the axial direction of the valve shaft are engaged with the slits formed in the cylinder that extend diagonally and have a large pitch, and the slits are formed on the top surface of the cylinder to rotate together with the cylinder. It is characterized by being provided with a movable bush and a pointer that rotates together with the bush.

With this configuration, it is possible to monitor the opening degree of the valve from the side and above with the same accuracy.

(Description of Embodiment) FIG. 1A is a side cross-sectional view of a valve opening indicating mechanism according to an embodiment of the present invention, in which a hollow main body 1 fixed to a valve (not shown) is similar to the above-mentioned known mechanism. A collar 6 having a square hole that engages with the corner of the end of the valve stem 3, and a cylinder 5 that is locked and fixed by the collar 6 and a key 7 are disposed inside the valve stem 3. The cylinder 5 rotates together.

The main body 1 has slits 1a and 1b in the vertical direction.
However, the cylinder 5 is provided with diagonally large pitch slits 5a and 5b, respectively, and the cylinder 5 is provided with a driving screw portion 2b concentrically arranged with the valve shaft 3. Axis 2 is arranged,
A piece 4 is screwed into the threaded portion 2b, and protrusions 4a and 4b formed on the piece 4 engage with the slits 1a and 5a and the slits 5a and 5b, respectively.

A large diameter portion 2a is formed at the lower end of the drive shaft 2, and this portion engages with the cylinder 5 to prevent upward movement of the drive shaft 2, allowing only rotation at this position. .

With this configuration, it is possible to monitor the movement of the piece 4 from the side and instruct the open/closed state of the valve, similarly to the above-mentioned known device.

In such cases, in the present invention,
A bush 8 is disposed on the top surface of the cylinder 5, and an appropriate number of notches (two in the illustrated one) 8a, 8b are formed at the bottom end of the bush 8. It engages with the formed notches 5c and 5d.

Furthermore, a pointer 9 is fixed to the top surface of the bush 8 so as to rotate together with it.

With this structure, when the drive shaft 2 is rotated, the piece 4 moves up and down, thereby rotating the cylinder 5 and, therefore, the valve member (not shown) via the valve 3. At this time, the opening degree of the valve can be observed from the side by the movement of the piece 4, and the pointer 9 also turns by the rotation of the cylinder 4. Therefore, the valve opening degree can be monitored from above.

(3) Effects of the invention As explained above, when using the invention, the valve opening degree of a rotary valve such as a butterfly valve can be monitored with the same precision both from the side and from above. The range of use of the valve can be greatly expanded.

[Brief explanation of the drawing]

Fig. 1A is a side sectional view of the opening indicating mechanism showing an embodiment of the present invention, Fig. 1B is a partial perspective view of the same, and Fig. 2
The figure is a side sectional view showing an example of a known opening degree indicating mechanism. 1...Main body, 2...Drive shaft, 3...Valve shaft, 4...
... Piece, 5... Cylinder, 8... Butsuyu.

Claims (1)

[Scope of claim for utility model registration] A hollow body fixed to an immovable part such as the valve body of a rotary valve, a cylinder disposed within the body so as to be rotatable only and attached to the end of the valve shaft, and the cylinder a drive shaft that is located inside the cylinder and is arranged concentrically with the valve shaft and has a thread formed in the inner part of the cylinder, and a protrusion formed on the piece that is screwed into the threaded part is formed on the main body; A slit extending in the direction and a slit extending diagonally in the cylinder and formed at a large pitch are engaged with each other, and a bush that rotates together with the cylinder and a bush that rotates with the bush are mounted on the top surface of the cylinder. A valve opening indication mechanism that is equipped with a moving pointer.