JPH0456916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a switching device that can switch the operation of a rotating valve body such as a butterfly valve or a ball valve to either manual or automatic operation.

(Prior art) A valve with a rotating valve body, such as a butterfly valve or a ball valve, has a valve stem connected to the rotating shaft of the valve body that extends outside the main body to serve as a drive shaft, and a driving force is applied to this valve stem. Connected and operating. Valve opening and closing operations can be performed automatically using fluid pressure or electrical driving force.
It is configured such that a switching device can switch between two types of operation: manual operation and manual operation. Normal valve opening and closing operations are performed automatically, and manual operation is required during test runs of valves that have not yet been connected to the driving force for automatic operation, or in emergencies when the automatic operation mechanism is disabled for some reason. This switch opens and closes the valve.

(Problems to be Solved by the Invention) A valve that selectively enables two types of operation, automatic operation and manual operation, is equipped with a manual operation consisting of, for example, a gear train on the upper part of the main body 1, as shown in FIG. A mechanism 2 and an automatic operation mechanism 3 consisting of a fluid pressure device are arranged on the drive shaft, and a switching mechanism 4 consisting of a clutch device is disposed between both mechanisms 2 and 3, so that both mechanisms 2 and 3 are connected to the drive shaft. The valve is opened and closed by selectively connecting and disconnecting the three mechanisms 2, 3, and 4, but forming and installing these three mechanisms 2, 3, and 4 separately increases the manufacturing cost of the valve.
In addition, the valve operating mechanism occupies an excessive amount of space, and the number of parts increases, resulting in a problem that maintenance is laborious and costly. Moreover, because of the manual operation mechanism and its switching mechanism, which are unnecessary except in specific cases such as test runs or emergencies, there are problems such as the overall size of the valve becomes large and the cost increases considerably. Ta.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems found in conventional butterfly valves and ball valves that can be switched between automatic and manual operation.
A worm wheel is fixed to a drive shaft that is connected to an automatic operation mechanism and can drive a valve body, and a worm gear that meshes with the worm wheel is fixed to the gear shaft,
The gear shaft is slidable in the axial direction together with a manually operable handle shaft, and a stopper cylinder connected to the handle shaft is provided with a stopper at an interval corresponding to the distance from the meshing position to the non-meshing position between the worm gear and the worm wheel. The present invention is characterized in that a groove is formed and a stopper disk is provided which can rotate between a position where it engages in the stopper groove and a position where it does not engage.

(Function) By rotating the stopper disk and separating it from the stopper groove, the gear shaft can slide freely in the axial direction, and when the handle is pushed in or pulled out by hand, the gear shaft integrated with this can be moved in the axial direction via the handle shaft. The worm gear can be changed to a state in which the worm gear is engaged with the worm wheel or a state in which it is not engaged with the worm wheel. As a result, the drive shaft can be rotated manually or automatically.

(Effects of the invention) The switching mechanism is simplified, reducing the number of parts and cost, and it is easy to operate because switching between manual and automatic modes can be performed simply by operating the handle. .

(Embodiments) Preferred embodiments of the present invention will be described below with reference to FIGS. 1 to 7. The illustrated embodiment is applied to a butterfly valve, but it is also applicable to a ball valve or other structure that includes a rotating valve body and a drive shaft for driving the valve body that extends outside the main body. Those skilled in the art will readily understand that the invention is equally applicable to various types of valves.

In the figure, reference numeral 10 denotes a drive shaft that is connected to the disc-shaped valve body of the butterfly valve and can rotate the valve body, and is driven by fluid pressure such as air pressure or electrical energy as is conventionally known. The valve body is connected to a drive device and is driven by an automatic operation device to open and close the valve body. A worm wheel 11 is attached to the drive shaft 10, and a worm gear 12 that meshes with the worm wheel 11 is fixed to a gear shaft 13. The gear shaft 13 is rotatably and axially supported by a gear box 15 that is integral with the main body casing 14 . A gear box 1 is installed at one end of the gear shaft 13.
A handle shaft 16 extending outward from the handle shaft 5 is connected, and a slip-out prevention nut 17 is fastened to the other end.
A handle 18 is fixed to the handle shaft 16.

Reference numeral 19 denotes a stopper cylinder rotatably inserted on the outer periphery of the shaft 16, and two stopper grooves 21 and 22 into which the stopper disk 20 engages are formed on the outer periphery. two stopper grooves 21,
22 is positioned at an interval corresponding to the distance that the worm gear 12 moves in the axial direction from a position where it engages with the worm wheel 11 to a position where it does not engage. The stopper disk 20 is rotatably supported on the gearbox 15 by an axle pin 23 at a position eccentric from the center, and is rotatably supported on the gearbox 15 via the axle pin 23, with the stopper disk 20 being centered around the axle pin 23. It has an engagement hole 24 extending laterally from the center along the rotation locus. The engaging hole 24 has a small diameter portion 24a having a center diameter equal to the outer diameter of the stopper groove 21, and a peripheral portion having a diameter equal to the outer diameter of the stopper groove 21.
It is a daruma-shaped hole with the same diameter as the large diameter part 24b of 9, and the small diameter part 24a at the center is connected to the stopper groove 21.
When the stopper cylinder 19 is engaged with the stopper disk 20, the stopper cylinder 19 is prevented from moving in the axial direction
Rotate the large diameter part 24b to the stopper cylinder 1.
When the stopper cylinder 19 is positioned on the outer periphery of the cylinder 9, the stopper cylinder 19 can be freely moved in the axial direction. 25 is an arc-shaped guide hole formed in the stopper disk 20;
Reference numeral 26 denotes a guide pin that engages in the guide hole 25 and guides the rotation of the stopper disk 20 and regulates the amount of rotation. 27 is stopper disk 2
This is a bar handle for rotating the 0.

The stopper cylinder 19 is held between a flange 28 formed on the gear shaft 13 and a cylindrical spacer 29 inserted between the handle 18 and is integral with the gear shaft 13 and the handle shaft 16 in the axial direction. be converted into It goes without saying that the stopper cylinder 19 may be integrally extended toward the handle 18 instead of the spacer 29.

30 is a cylindrical cover that covers the nut 17 attached to the other end of the gear shaft 13, and has a length corresponding to the moving distance of the gear shaft 13 from the meshing position to the non-meshing position, At a position where the worm wheel 11 and the worm gear 12 are engaged, the tip of the nut 17 comes into contact with the inner end of the cover 30.

1 and 2 show the state during automatic operation using fluid pressure and electric energy, the gear shaft 13 and the handle shaft 16 are moved to the right in FIG.
It is in a non-meshing position away from 1. In this position, the small diameter portion 24a of the stopper disk 20 is aligned with the first stopper groove 2 of the stopper cylinder 19.
1, the gear shaft 13 and the handle shaft 16 are held in a non-meshing position, and even if the handle 18 is rotated, the rotational force is not transmitted to the drive shaft 10.

3 and 4 show the state during manual operation in which the handle 18 is rotated to drive the drive shaft 10. From the state shown in FIGS. 1 and 2, the gear shaft 13 and the handle shaft 16 are moved to the left in the figure. , and the worm gear 12 is in a position where it meshes with the worm wheel 11. In this position, the stopper disk 20 is engaged in the second stopper groove 22.

5 and 6 show a state in which the worm gear 12 and the worm wheel 11 are allowed to be exchanged to an engaged position or a non-engaged position, and the stopper disk 20 is rotated by the bar handle 20,
The large diameter portion 24b of the engagement hole 24 is located on the outer periphery of the stopper cylinder 19. This allows the stopper cylinder 19 to move freely in the axial direction, so by pushing in or pulling out the handle 18, the gear shaft 13 is slid in the axial direction via the handle shaft 16, and the worm gear 12 is engaged with the worm wheel 11. The position shown in Figures 3 and 4,
Alternatively, it can be moved to the non-meshing position shown in Figures 1 and 2. Then, when moving to the engaged position,
Since the spacer 29 is inserted between the handle 18 and the stopper cylinder 19, the handle 1
By pushing in while rotating 8, the stopper cylinder 19 is pushed inward, and the worm gear 1
2 can be engaged with the worm wheel 11, and there is no need to manually push in the stopper and apply rotational pushing force to the handle as in the conventional case, which simplifies the operation. Since it touches the inner end, it is possible to confirm the exact engagement position.

Further, to move to the non-meshing position, by rotating the handle 18 in the reverse direction, the gear shaft 13 is pushed out by the meshing of the worm gear 12 and the worm wheel 11. At the completely disengaged position, the nut 17 abuts against the end face of the gearbox 15.

After moving to the engaged position or non-engaged position in this manner, the stopper disk 20 is rotated to engage the small diameter portion 24a of the engagement hole 24 into the first or second stopper groove 21, 22. Good.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the automatic operation position, FIG. 2 is a side view of the same, and FIG. 3 is a sectional view showing the manual operation position.
Fig. 4 is a side view of the same, Fig. 5 is a sectional view showing the switching position, Fig. 6 is a side view of the same, Fig. 7 is a perspective view of the gear shaft, handle shaft, stopper disc, etc., and Fig. 8 is a conventional FIG. 3 is a front view of a valve having a switching mechanism. 10... Drive shaft, 11... Worm wheel, 12
...Worm gear, 13...Gear shaft, 14...Body casing, 15...Gear box, 16...Handle shaft, 17...Nut, 18...Handle, 19...Stopper cylinder, 20...Stopper disk, 2
1, 22...stopper groove, 23...shaft pin, 24...
Engagement hole, 25... Guide hole, 26... Guide pin, 27...
Bar handle, 28...flange, 29...spacer, 3
0...Cover.

Claims (1)

[Claims] 1. A worm wheel is fixed to a drive shaft that is connected to an automatic operation mechanism and can drive a valve body, a worm gear that meshes with the worm wheel is fixed to a gear shaft, and the gear shaft is axially moved together with a manually operable handle shaft. A stopper cylinder which is slidable and connected to the handle shaft is provided with stopper grooves at intervals corresponding to the distance from the meshing position of the worm gear and the worm wheel to the non-meshing position, and a position where the stopper groove engages with the worm wheel is formed. 1. A valve operation switching device comprising a stopper disk that can rotate between a non-engaged position and a non-engaged position.