JPS6235183A - Switching device for valve control - Google Patents

Abstract

PURPOSE:To easily perform switching operation to a manual control mechanism and an automatic control mechanism, by providing a worm gear, meshed with a worm wheel secured to a driving shaft, in a manual handle shaft and turnably forming it to a position where the worm wheel is disengaged from the worm gear. CONSTITUTION:To disconnect a device from its manually controllable condition that a worm gear 12 is engaged with a worm wheel 11, the device, removing a lock pin 16, places a handle shaft 14 in a free turning condition. Under this condition, the handle shaft 14 is turned to retreat the worm gear 12 from the worm wheel 11, and the device, if it releases the worm wheel 11 from its engagement with the worm gear 12, enables a valve unit to be opened and closed through automatic operation by actuating an automatic control unit because the worm wheel 11 can be freely turned.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a valve with a rotating valve body such as a butterfly valve or a ball valve (prior art). The valve stem connected to the rotating shaft extends outside the main body to serve as a drive shaft, and a driving force is connected to this for operation. The opening/closing operation of the valve is configured such that a switching device can switch between two types of operations: automatic operation using fluid pressure or electric driving force, and manual operation. Normal valve opening/closing operations are performed automatically, and during test runs of valves that have not yet been connected to the driving force for automatic operation, or during automatic operation 8! In the event of an emergency when the system is disabled for some reason, the system switches to manual operation to open and close the valve.

(Problems to be Solved by the Invention) A valve that selectively enables two types of operation, automatic operation and manual operation, is made up of, for example, a gear train mounted on the upper part of the main body (1), as shown in FIG. A manual operation mechanism (2) and an automatic operation mechanism (3) consisting of a fluid pressure device are arranged on the drive shaft, and a switching mechanism (2) consisting of a clutch device is arranged between the two mechanisms (2) and (3).
4) to selectively connect and disconnect the two mechanisms (2), (3) and the drive shaft to open and close the valve, but these three mechanisms (2), (3), and Separately forming and attaching the valve increases the manufacturing cost of the valve, and the valve operation mechanism occupies too much space, increases the number of parts, and requires time and cost for maintenance. .

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) This 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. Automatic operation! 8! A worm wheel is fixed to a drive shaft that is connected to a drive shaft that can open and close a valve body, and a manual handle shaft having a worm gear that meshes with the worm wheel can be freely rotated to a position where the worm wheel and the worm gear do not mesh. shall be.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to FIG. 1.2. Although the illustrated embodiment is applied to a butterfly valve, it can also be applied to a ball valve or other valve that is equipped with a rotating valve body and in which a drive shaft for driving the valve body extends outside the main body. Applicability will be easily understood by those skilled in the art.

In the figure, (10) is 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 electric 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. (11) is a worm wheel attached to the drive shaft (10), and a worm gear (12) meshing with the worm wheel (11) is fixed to a handle shaft (14) equipped with a manual handle (13). Ru. Handle shaft (1
4) is attached to the gear box (15) so as to be pivotable around the tip end direction of the shaft. (16) is the handle shaft (
14), and is movable back and forth from the locked position with the handle shaft (14). The inner surface of the gear box (15) has a spherical surface (
17) (18), and the handle shaft (14) bearing (
19) and (20) are movable along the spherical surfaces (17) and (18). (21) is a bellows-shaped cover that extends between the gear box (15) and the handle shaft (14), and covers the shaft hole (22) from which the handle shaft (14) extends. Connect the worm gear (12) to the worm wheel (
11), and then lock the lock pin (16) into the handle 11.
11 (14) and prevents rotation of the handle shaft (14), the state shown in FIG. 1 indicates a state in which manual operation is possible.

When the manual handle (13) is manually rotated in the state shown in FIG. 1, the worm gear (12) is rotated via the handle shaft (14), and the worm wheel (11) that meshes with the worm gear (12) is rotated. The drive shaft (10) rotates to open and close the valve body.

To disconnect the manual operation, remove the lock pin (16) to allow the handle shaft (14) to freely rotate.

In this state, rotate the handle shaft (14) and move the worm gear (12) to the worm wheel (1) as shown in FIG.
1) and release the mesh between the worm wheel (11) and the worm gear (12), the worm wheel (11) can freely rotate. It can be opened and closed.

Rotate the handle shaft (14) and attach the worm wheel (11).
) with the worm gear (12) and lock pin (16).
) may be engaged with the handle shaft (14). This connects the manual handle (13) and the drive shaft (10), making it possible to open and close the valve body by manual operation.

The handle shaft (14) is locked using the lock pin (16) shown in the figure.
), and various locking mechanisms are applicable.

(Effects of the Invention) According to the valve operation switching device of the present invention, a worm wheel is fixed to a drive shaft that is connected to an automatic operation mechanism and can be used to rm the valve body, and a manual handle has a worm gear that meshes with the worm wheel. Since the shaft is rotatable until the worm wheel and worm gear are in a non-meshing position, it is possible to easily switch between the manual operation mechanism and the drive shaft that opens and closes the valve body, and the switching mechanism occupies a small space. Since the number of parts can be reduced and the number of parts can be reduced, costs can be reduced. Furthermore, the switching mechanism allows the handle shaft to be freely rotated in the conventional manual operation 8!2 mechanism, and locks the rotation. Since it is only necessary to attach the valve to the valve, it can be applied to a commercially available valve by simply modifying its structure.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a manual operation switching mechanism according to the present invention, FIG. 2 is a view similar to FIG. 1 showing a state in which the manual operation is disconnected, and FIG. It is a front view. (10)... Drive shaft (11)... Worm wheel (12)... Form gear (13)...
Manual handle (14)...handle shaft (15)...
...Gear box (16) ...Lock bin (17)
)(18)...Spherical surface (19)(20)...Bearing (21)...Cover (22)...Shaft hole Patent applicant Tomoe Technology Research Institute Co., Ltd. 10

Claims (1)

[Claims] (1) A worm wheel is fixed to a drive shaft that is connected to an automatic operation mechanism and can open and close a valve body, and a manual handle shaft having a worm gear that meshes with the worm wheel can be freely rotated to a position where the worm wheel and worm gear are not meshed. A valve operation switching device characterized by: