JP2000120915A - Rotation-locking device for valve stem - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation-locking device for a valve stem, capable of being manufactured in lightweight, reducing costs, eliminating factors generating dew condensation, and preventing erroneous operation. SOLUTION: With the rotation-locking device for a valve stem, a sleeve 5 through which a stem 4 is passed, is fitted on the body 1 side so that it can move vertically, but cannot be rotated, and its top is fixed not to be slipped out upward. A stem-through hole of the sleeve 5 is non-circular, and the sleeve 5 is energized by a spring to move upward. The stem 4 has a non-circular part 4c having the same shape as that of the stem-through hole, and a circular part on its lower side. By depressing the sleeve 5 against the spring tension, the sleeve is positioned at the circular part of the stem 4 to enable the stem 4 to rotate, and by releasing the depression of the sleeve 5, the sleeve 5 rises by the spring tension to be fitted on the non-circular part of the stem 4, and thus to prevent the rotation of the stem 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve mounted on a pipe of an air conditioner, a plant, a factory, or the like.
The present invention relates to a device for rotating and locking a valve shaft used for a ball valve or other valves.

[0002]

2. Description of the Related Art A butterfly valve is one example of such an apparatus. This valve is a lever operating device having a lever handle and a lock lever at the outer end of the valve shaft cylinder, and a valve body covered with a heat insulating material for heat insulation by extending the valve shaft cylinder and piping, or a scotch yoke type. , A worm gear type, a bevel gear type or the like, and a lever operating device and the like are mounted while being exposed to the outside of the heat insulating material. As described above, since the lever operating device, the deceleration operating device, and the like are mounted on the outer end portion of the valve shaft cylinder, the entire device is increased in size and weight, and also causes a cost increase.

Further, since the lever operating device and the like are covered with a heat insulating material in a protruding state, the lever operating device and the like exposed to the outside may be erroneously operated or carelessly operated due to negligence or mischief. May be done.

[0004] Furthermore, when covering the outer periphery of a butterfly valve or the like with a heat insulating material, the operation is troublesome or difficult because the lever operating device or the like is covered outside the heat insulating material. However, the operating device itself has a problem such as dew condensation.

[0005] The present invention has been developed to solve the conventional problems, and its object is to make it possible to reduce the cost while making it lightweight.
It is possible to provide a valve shaft rotation / lock device capable of eliminating the cause of dew condensation and preventing erroneous operation.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sleeve through which a stem penetrates and is non-rotatably fitted to a body side so as to be vertically movable, and is prevented from falling off upward. The through-hole is made non-circular, and the sleeve is urged upward by a spring.The stem has a non-circular portion having substantially the same shape as the stem through-hole, and a lower circular portion, and the sleeve resists the spring force. By pressing down, it is positioned at the circular part of the stem to enable rotation of the stem, and by releasing the pressing down of the sleeve, the sleeve rises by spring force and fits into the non-circular part of the stem to prevent rotation of the stem. This is a valve shaft rotation / lock device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a valve shaft rotation / lock device of a butterfly valve, a ball valve and other valves according to the present invention is applied to a butterfly valve will be described with reference to the drawings. 1 to 7 show an example of a valve shaft rotating / locking device. A bonnet 2 is fixed on a cylindrical body 1 constituting a butterfly valve with bolts 3 and rotated inside the body 1. A stem 4 fixed to a disk (not shown) is rotatably provided.

The stem 4 is provided with a thick shaft portion 4a and a circular portion 4b as a thin shaft portion thereon, and a non-circular portion 4c as a square shaft portion with a chamfered corner at the upper end thereof. Yes,
The small shaft portion 4b has substantially the same diameter as the small diameter portion of the chamfered portion 4d of the square shaft portion 4c. As shown in FIG. 4, the thick shaft portion 4a of the stem 4 regulates the lowering position of the sleeve 5 so as not to lower further.

A stop ring 6 such as an E-ring is fitted in the middle of the stem 4 and the stem 4 is prevented from coming off by a projection 7 fixed between the bush 7 on the body 1 and the body 1 and the hood 2. . The sleeve 5 described above is
The coil spring 9 fits into the stem 4 inside the bonnet 2.
, And is prevented from coming off by a stopper portion 3a formed integrally with the upper end of the bonnet 2.

The stem through-hole 5a of the sleeve 5 is
The non-circular portion 4c, which is a square shaft portion of the stem 4, is a non-circular portion 5a having substantially the same shape as the non-circular portion 4c. The non-circular portion 4c and the non-circular portion 5a are provided so as to rotate integrally in the fitted state. If so, the non-circular shape of both may be any shape. As described above, the non-circular portion 5a of the sleeve 5 fits into the non-circular portion 4c of the stem 4 at the rising end to prevent rotation of the stem 4, and when pushed down, the diameter of the thin shaft portion 4b of the stem 4 and the sleeve 5 Since the non-circular portion 5a has substantially the same diameter as the small-diameter portion of the chamfered portion 5b, the small-diameter portion 4b is provided so as to substantially contact the non-circular portion 5a and the stem 4 is allowed to rotate.

The lower side of the center hole of the sleeve 5 is a thick hole 5.
c, and is provided so that the thick shaft portion 4a can be fitted therein. The guide projections 5d provided at both ends of the sleeve 5 are engaged with the engaging portions 2a of the bonnet 2 so as to be non-rotatably fitted vertically.

In the drawing, reference numeral 10 denotes a hole for fixing a gear unit for manual operation, reference numeral 10a denotes a relief portion for a nut, reference numeral 11 denotes an indicator for confirming the open / closed state,
Reference numeral 12 denotes a heat insulating material.

In this embodiment, since the stem 4 is rotated as described above, when the stem 4 is rotated, a handle (not shown) is fitted onto the stem 4 and pushed down to thereby turn the non-circular portion 5a of the sleeve 5 down.
Is positioned at the small-diameter portion 4b of the stem 4, and by turning the handle in this state, the stem 4 can be rotated.

On the other hand, when the handle is released from the depressed state,
The sleeve 5 is raised by the spring force of the coil spring 9, and the non-circular portion 4c of the stem 4 is fitted into the non-circular portion 5a, so that the stem 4 cannot rotate and is securely locked. In this case, if the indicator 11 itself is strong and has a handle function, the indicator 11 can be fitted to the stem 4 and rotated.

FIGS. 8 and 9 show another example of the valve shaft rotating / locking device. The same parts as those in the above example are denoted by the same reference numerals, and the description thereof will be omitted. According to the present example, the protrusion 14 a is provided on the bonnet 14, the guide groove 13 b is provided on the sleeve 13, and the sleeve 1
3 is provided so as to be vertically movable and non-rotatable.

In each of the above examples, if the diameter of the thin shaft portion 4b of the stem 4 is made to coincide with the minimum diameter of the non-circular portion 4c, the posture of the sleeves 5, 13 is stabilized.

Furthermore, even if the outer peripheral shape of the sleeve is a non-circular cylindrical body such as a square or hexagon, the function of preventing rotation can be exhibited.

[0018]

Therefore, according to the present invention, since it can be manufactured at a light weight and at a low cost, it is remarkably economical as compared with the conventional product, and there is no operation part such as a handle, so that the valve shaft is not provided. Erroneous operation of the valve shaft can be prevented, unnecessary rotation of the valve shaft can be prevented, and when necessary, the valve shaft can be easily rotated and locked by attaching an operating part such as a handle, and the heat insulator When coating
Since the operation part is not exposed, the covering operation can be easily performed, and there is an effect that there is no fear of dew condensation. In addition, the attachment and detachment of the simple handle can help prevent erroneous operation and mischief, and this device is suitable for a line where valve opening and closing are less frequent.

Further, since the sleeve only moves up and down, the spring is only compressed and no torsional force acts, so that the spring can be reliably resiliently operated, and the rotation and locking mechanism are simple and compact. Further, since the non-circular portion and the circular portion of the stem are used for the lock mechanism, there is no deviation of the axis. Also, since the stem is attached by one,
There is little backlash due to coupling, and the positioning accuracy for opening and closing is increased.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an example of a valve shaft rotation / lock device according to the present invention.

FIG. 2 is a partially cutaway plan view of FIG. 1;

FIG. 3 is a partial vertical sectional view of FIG. 2;

FIG. 4 is a longitudinal sectional view showing a state where a sleeve shown in FIG. 1 is pushed down.

FIG. 5 is a perspective view of the stem in FIG. 1;

FIG. 6 is a perspective view of a sleeve in FIG. 1;

FIG. 7 is a cross-sectional perspective view of the sleeve of FIG. 6;

FIG. 8 is a plan view showing another example of the valve shaft rotation / lock device according to the present invention.

FIG. 9 is a partial longitudinal sectional view of FIG.

[Explanation of symbols]

 Reference Signs List 1 body 4 stem 5 sleeve 4c, 5c non-circular portion 5a stem through hole

Claims (1)

[Claims] 1. A sleeve, through which a stem penetrates, is vertically and non-rotatably fitted to a body side so as to be non-rotatably fitted, and is prevented from falling off. The stem has a non-circular part with the same shape as the above stem through-hole and a circular part below it, and it is possible to rotate the stem by pressing the sleeve down against the spring force and positioning it in the circular part of the stem The rotation / locking device for a valve shaft, wherein the sleeve is raised by spring force by releasing the pressing down of the sleeve and fitted into the non-circular portion of the stem to prevent the rotation of the stem.