JPH1038136A - Reduction operating device for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reduction operating device suitable for an eccentric rotary valve which brings about a large torque at the time of closing and improve its rotation efficiency at the time of opening by rotating an output rotary shaft by substantially 90 degrees. SOLUTION: In order to close a valve, a handle 23 is rotated to the right and a female screw member 30 is moved to the left side of a spindle 20. A link 50 is pushed and an arm 61 of an output rotary shaft 60 is rotated to the left by substantially 90 degrees. At this time, the link 50 and the spindle push the arm 61 of the rotary shaft 60 with a large angle in respect to a screwing amount of the female screw member 30. A rotation amount of the output rotary shaft 60 is thus small. A large torque can be obtained when the valve is opened or closed to secure the closing operation. In order to open the valve, the handle 23 is rotated to the left, and the female screw member 30 is rotated to the left. The female screw member 30 is moved to the right side of the spindle 20. The output rotary shaft 60 is rotated to the right by 90 degrees while pulling the link 50 and the arm 61. An operation amount of valve opening is thus enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed reducer for rotating a valve stem, such as a large-diameter ball valve or a butterfly valve, which opens and closes by rotating a valve body by 90 degrees, with a small torque, and more particularly to a valve. The present invention relates to a speed reducer suitable for an eccentric rotary valve requiring a large torque when closing a body.

[0002]

2. Description of the Related Art Conventionally, as this kind of speed reducer, there is one shown in FIG. 3 disclosed in, for example, Japanese Patent Application Laid-Open No. 61-197866. In this gear box, a fan-shaped worm wheel 2 linked to a valve stem 1 and a worm gear 4 linked to an operating tool 3 are provided in a gear case 5, and the valve stem is rotated 90 degrees by a reduction mechanism of the worm wheel 2 and the worm gear to rotate the valve. Is opened and closed.

[0003]

In the conventional speed reducer described above, the rotational locus of the operating tool 3 (the handle 6) and the rotational locus of the valve stem 1 are the same, and a constant reduction ratio can always be obtained. The worm wheel 2 and the worm gear 4, which are difficult to process, must be provided, and the weight is heavy. Also, since the rotation is always reduced at a constant reduction ratio, for example, in the case of an eccentric rotary valve or the like in which the valve body mounted in the valve is eccentrically rotated to press the valve body against the valve seat surface and closes, the valve body is closed when the valve is closed Requires a large operation torque to press the valve against the valve seat surface. However, a large torque capacity reduction operation device is required in consideration of the large torque when the valve is closed. Therefore, the number of rotations of the operation handle 6 is increased. Therefore, it takes time to open and close the valve, and the operating device becomes large. The present invention solves the above-mentioned problems, is easy to manufacture, can be light in weight, can rotate efficiently when the valve is opened, and can generate a large rotating torque when the valve is closed, and is particularly suitable for operation of an eccentric rotary valve. It is intended to provide a simple deceleration operating device.

[0004]

The gist of the present invention is to provide a spindle which is rotated by a drive source such as a manual drive, a female screw member which is screwed into the spindle and slides therethrough, and a through hole is formed in a side of the spindle of the female screw member. A link provided and connected by a pin, and an arm of an output rotary shaft connected to the other end of the link by a pin. The output rotary shaft is connected via the link by rotating the spindle and sliding the female screw member. Is driven by approximately 90 degrees. In the above, the screw with which the female screw member of the spindle is screwed can be made a two-start thread for efficient transmission.

[0005]

According to the present invention, when the spindle is rotated, the female screw member screwed to the spindle slides on the spindle and pushes the link connected to the side of the female screw member by a pin. Since the link is connected to the arm of the output rotary shaft by a pin, the output rotary shaft is rotated using the arm as the radius of the output rotary shaft, and the valve stem of the valve fixed to the output rotary shaft is rotated. Since the linear motion of the link female screw member is transmitted to the rotational motion of the output shaft arm, for example, the amount of movement of the female screw member near the link parallel to the spindle approaches the amount of rotational movement of the arm, and the link becomes larger than the spindle. Since the link pushes the arm at a large angle with respect to the amount of movement of the female screw member when the angle is reached, the amount of rotational movement of the arm is reduced.

Therefore, the valve is closed at a large angle where the link approaches a right angle with the spindle, and is connected to the valve stem of the valve so that the valve is opened near the link approaches the spindle. The rotating torque at the time of closing the valve is increased, the amount of movement of the valve body at the time of opening the valve is increased, and the valve can be opened and closed efficiently. Further, since the female screw member and the link are connected to the side of the female screw member, the connecting pin can be penetrated and connected to the female screw member, and the connection between the female screw member and the link can be easily performed. Further, the length between the fulcrum points of the link connected to the side of the female screw member can be increased, and the reduction ratio increases by that much, so that a large torque can be generated. Furthermore, a torque can be efficiently transmitted by using a double-threaded screw between the spindle and the female screw member, so that a simple structure and a compact structure that is easy to manufacture can be provided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial plan sectional view showing an embodiment of the present invention, showing a state in which a valve is closed. FIG. 2 is a side sectional view of FIG. In the figure, a case 10 has a spindle 20 rotatably supported by thrust bearings 21 and 22 provided on both sides thereof, and is fixed by lids 11 and 12. The lower part of the case 10 is provided with a fixing flange 13 for fixing to the upper end flange of the valve. The spindle 20 is made of stainless steel, and is provided with a square double threaded screw 24 by a thread rolling method.
2 and is fixed to the handle 23. An internal thread member 30 is screwed into the rectangular double thread 24 so that a large moving distance can be obtained with a large torque.

The female screw member 30 is made of a copper alloy so as not to cause seizure with the spindle 20, and is provided with a rectangular double-threaded screw 31 to be screwed with the spindle. It penetrates and is rotatably connected to the link 50. The connecting pin 40 of the female screw member 30
The side end surface 32 is provided near the inner side surface 14 of the case 10. Two links 50 are provided above and below the female screw member 30 so as to sandwich the female screw member, and are connected to the female screw member 30 by the connecting pin 40. The other end is rotatable vertically above and below the arm 61 of the output rotary shaft 60. They are connected by connecting pins 41. The arm 61 is formed integrally with the output rotation shaft 60, and the valve shaft 70 is fixed to the output rotation shaft 60.

FIG. 1 shows a state at the time of a valve closing operation.
By turning the handle 23 clockwise, the female screw member 30 is moved to the left side of the spindle 20, and the link 50 is pushed to rotate the arm 61 of the output rotary shaft 60 counterclockwise. At this time, since the link 50 pushes the arm 61 of the rotating shaft 60 at a large angle with the spindle with respect to the moving amount of the female screw member 30 to be screwed, the rotating movement amount of the output rotating shaft 60 is small, and thus the valve is closed. In this case, a large torque can be obtained, so that the closing operation can be reliably performed. At this time, the link 50 is connected to the arm 61
The spindle 20 is pushed upward in the drawing as a reaction force to
The spindle 20 supports this force. In the present embodiment, the side end surface 32 of the female screw member 30 comes into contact with the inner side surface 14 of the case 10 and receives this reaction force.

On the contrary, when the valve is opened, the handle 2
3 is rotated counterclockwise to move the female screw member 30 to the right side of the spindle 20, and the link 50 and the arm 61 are pulled to rotate the output rotation shaft 60 clockwise. When the valve is opened in this manner, the link 50 sequentially approaches the spindle 20 and the angle between the spindle 20 and the spindle 20 decreases, so that the rotational movement amount of the output rotary shaft 60 approaches the screwing movement amount of the female screw member, and the valve moves. The amount of operation at opening increases. A normal valve requires a large closing operation torque when the valve is closed, and does not require a large torque when the valve is opened because the valve element is loosely fitted in the valve box. Therefore, the deceleration operating device of the present embodiment is suitable as an operating device for a valve. Although the present embodiment has been described with the manual handle, an electric motor, an air motor, or the like may be used instead of the manual handle.

[0011]

As described above, the speed reducer according to the present invention can open and close the valve efficiently, can easily connect the mating screw member to the link, and can easily connect the link member to the side of the female screw member. The fulcrum length can be increased to increase the reduction gear ratio and generate a large torque. Further, no worm wheel or worm gear is required, the manufacture is easy, and the whole can be made lightweight and compact. This is a very good operating device for valves.

[Brief description of the drawings]

FIG. 1 is a partial plan cross-sectional view showing one embodiment of the present invention when a valve is closed.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a partial plan sectional view showing a conventional valve speed reducer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Case 11, 12 Lid 13 Fixed flange 14 Inner side surface 20 Spindle 21, 22 Thrust bearing 23 Handle 24 Spindle square double thread 30 Female thread member 31 Square double thread of female thread member 32 Side end face of female thread member 40, 41 Connecting Pin 50 Link 60 Output Rotary Shaft 61 Arm of Output Rotary Shaft 70 Valve Stem

Claims (2)

[Claims] A spindle that is rotated by a manual or equivalent rotary drive source, a female screw member that is screwed into the spindle and slides, a link that is provided with a through hole in a spindle side of the female screw member and is connected with a pin, An output rotary shaft arm connected to the other end of the link by a pin, and rotating the spindle to slide the female screw member to rotate the output rotary shaft by approximately 90 degrees via the link. Characteristic reduction gear operating device for valves. 2. The valve speed reducer according to claim 1, wherein the screw into which the female screw member of the spindle is screwed is a double thread.