JPH0438138Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a drive device for the valve body of a valve such as a butterfly valve that opens and closes the valve by rotating the valve body, and in particular relates to a valve body drive device for a valve such as a butterfly valve that opens and closes the valve by rotating the valve body. The present invention relates to a drive device equipped with a lever.

(Prior art) Conventionally, in a type of valve such as a butterfly valve that opens and closes by rotating the valve body, an operating lever is attached to the valve stem that supports the valve body, and the operating lever is manually rotated. There are known valves that open and close the valve body. In such a manual operation mechanism, a lock is provided on the operating lever to prevent erroneous operation, especially when there is no need to change the set opening for a long period of time, and to maintain the set opening. The present inventor previously proposed an operating mechanism in which the operating lever is composed of a main lever and an auxiliary lever, and the auxiliary lever is detachable.

As shown in FIG. 5, this operating mechanism connects an adapter 1 to the outer end of a valve stem that pivotally supports a valve body by means of a key engagement, and connects a main lever to the adapter 1. 2 are attached so that they can freely pivot vertically on a shaft 3 and are rotated in one direction, and a protrusion 5 that engages with a notch in the opening plate 4 is formed at the tip of the main lever 2. An auxiliary lever 6 is removably connected to the auxiliary lever 6 with a lock screw 7.
By pushing down the auxiliary lever 6 by hand, the tip of the main lever 2 moves upward and the protrusion 5 disengages from the notch in the opening plate 4, allowing the adapter 1 to rotate freely via the main lever 2. The valve body can be opened and closed via the valve stems that are connected together in the rotating direction. When the auxiliary lever 6 is removed from the main lever 2, the main lever 2 becomes inoperable manually, which, together with the engagement between the tip and the protrusion, has the advantage of preventing erroneous operation.

(Problems to be Solved by the Invention) In the structure shown in FIG. The structure allows the main lever 2 to be rotated by releasing the engagement.
There was a risk that the valve stem would be rotated by an unexpected external force.

(Means for Solving the Problems) In order to solve the above problems, this invention attaches an adapter to the outer end of the valve stem that supports the valve body so that it can freely open and close. A main lever, which has a hook portion that fits into a notch in the dial and is always biased in the direction that the hook portion fits into the notch, is attached to the adapter so that it can rotate in one direction and pivot freely in the vertical direction. , the auxiliary lever is connected to the rear end of the main lever so that it can move forward and backward, and the tip of the auxiliary lever is engaged with the adapter in the forward position, making it impossible to push down the auxiliary lever.

(Function) By moving the auxiliary lever forward, its tip engages the adapter, making it impossible to push it down.On the other hand, by moving it backward and releasing the connection with the adapter, the auxiliary lever can be pushed down, and the main lever, adapter, and valve stem The valve body can be opened and closed through.

(Effects of the invention) According to this invention, by advancing the auxiliary lever and engaging it with the adapter, it becomes impossible to push down the auxiliary lever, so the manual lever can be easily locked, and unexpected external forces This eliminates the danger of the valve body opening and closing.

(Embodiment) A preferred embodiment of this invention will be described below with reference to the drawings. Although the illustrated embodiment relates to a butterfly valve, it is not limited to this, and can be applied to all valves whose valve bodies are opened and closed by rotating a valve stem.

In the figure, reference numeral 10 denotes an adapter that is inserted into the outer end of a valve stem that supports a valve body that is rotatably supported inside the main body of a substantially cylindrical butterfly valve, and that is integrated in the rotational direction with a key. It is. As shown in FIG. 4, the adapter 10 has a shaft hole 11 penetrated through its center, and a keyway 12 is attached to the shaft hole 11. An extension plate 13 extending laterally is integrally formed on the adapter 10, and a cylindrical projection 14 is formed approximately at the center of the upper surface of the extension plate 13.

Reference numeral 15 denotes a main lever, which is pivotally supported by a shaft pin 16 on the adapter 10 so as to be able to freely pivot in the vertical direction. The main lever 15 and the adapter 10 are integrated in the rotational direction, and when the main lever 15 is rotated in the horizontal direction, the valve stem can be rotated via the adapter 10. The main lever 15 is the first
As shown in the figure, the tip has a hook portion 18 that fits into the notch of the opening plate 17, and the projection 1 is provided on the rear lower surface.
A protrusion 19 that abuts with 4 is formed. Main lever 1
A spring 20 is tensioned between the main lever 15 and the adapter 10, and constantly urges the main lever 15 in the direction in which the hook portion 18 at the tip fits into the notch of the opening plate 17. Connect the rear end of the main lever 15 to two protrusions 1
When the main lever 15 and the opening plate 1 are pushed down against the spring 20 until they collide with each other, the main lever 15 and the opening plate 1
7, the main lever 15 becomes freely rotatable.

As shown, the main lever 15 is formed to have a short length that substantially matches the diameter of the valve body to reduce the space required for packaging. An auxiliary lever 21 is detachably connected to the main lever 15. Reference numeral 22 denotes a lock screw that prevents the auxiliary lever 21 from coming off. It can be easily screwed out with fingers, and a rubber ring 23 is interposed between the head 24 of the lock screw 22 and the main lever 15 to prevent it from loosening. has been done.

A screw insertion hole 25 formed in the auxiliary lever 21 for inserting the lock screw 22 is formed into a long hole extending in the longitudinal direction of the auxiliary lever 21.
The auxiliary lever 21 can move forward or backward in the longitudinal direction within the range of the elongated hole.

FIG. 2 shows the state in which the auxiliary lever 21 is advanced, and the tip of the auxiliary lever 21 engages with the upper end of the extension plate 13 in the form of the adapter 10, making it impossible to push down the auxiliary lever 21.

Further, FIG. 3 shows the retracted state, and since the tip of the auxiliary lever 21 is removed from the upper end of the extension plate 13, the auxiliary lever 21 can be pushed down.

In the state shown in FIG. 2, the auxiliary lever 21 cannot be pushed down and is locked, so there is no risk of the auxiliary lever 21 being operated by an unexpected external force.

In the illustrated embodiment, the tip of the auxiliary lever 21 is engaged with the adapter 10, but the structure is not limited to this, and the auxiliary lever 21 may be engaged with the main body of the valve or the valve stem cylinder. Of course, it is also a good thing.

[Brief explanation of the drawing]

Fig. 1 is a side view of the drive device according to this invention, Fig. 2 is a sectional view showing the auxiliary lever in the forward state, and Fig. 3
FIG. 4 is a perspective view of the adapter, and FIG. 5 is a front view of the conventional drive device. 10...Adapter, 11...Shaft hole, 12...Keyway, 13...Extension plate, 14...Protrusion, 15...
Main lever, 16... Axis pin, 17... Opening plate, 1
8...Hook portion, 19...Protrusion, 20...Spring, 21...Auxiliary lever, 22...Lock screw, 23...Rubber ring, 24...Head, 25...
...Screw insertion hole.

Claims (1)

[Scope of utility model registration request] An adapter is attached to the outer end of the valve stem, which supports the valve body so that it can be freely opened and closed, and has a hook part that fits into the notch of the valve opening plate, and the hook part is always engaged with the notch. The main lever, which is biased in the direction of A valve body driving device characterized in that the tip of the lever is engaged with an adapter, making it impossible to push down the auxiliary lever.