JP2002039432A - Opening and closing operation rod for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening and closing operation rod free from the use of a torque transmission pin to dispense with the complex exchanging work of the torque transmission pin, and capable of being adapted to the opening and closing operation of a number of valves by one opening and closing operation rod of the valve, and preventing the valve from being damaged in opening and closing operation to protect the valve, without mounting a slip device at a side of a number of valves to be used. SOLUTION: An operating shaft part 1 and a box part 2 are simultaneously rotatably connected through a slip device 11. When the torque in opening and closing operation is over a predetermined value, an annular irregular part 2D at a box part 2 side and an annular irregular part 14A at an upper ring 14 side, and an annular irregular part 2E of the box part 2 side and an annular irregular part 15A at a lower ring 15 side, respectively engaged with each other are slipped in the circumferential direction to idle a shell 12 of the slip device 11, the upper ring 14, the lower ring 15 and a cap 16, and the operating shaft part 1 and the box part 2 are relatively rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve opening / closing operation rod, for example, a valve used for opening / closing a valve such as a gate valve, a butterfly valve or a ball valve interposed in a water supply pipe or the like. About sticks.

[0002]

2. Description of the Related Art Conventionally, for example, a valve shown in FIG. 14 has been known as an operating rod for opening and closing a gate valve interposed in a water supply pipe. The opening / closing operation rod of the valve includes an operation shaft portion 1 and a box portion 2 provided with a rectangular recess 2A. The operation shaft portion 1 includes an operation-side first shaft 3 having a hollow portion 3A having a uniform inner diameter and extending in the axial direction provided at a distal end side.
And an opposite operation-side second shaft 4 inserted into the hollow portion 3A of the operation-side first shaft 3. A handle 5 for opening and closing operation is integrally provided at the rear end of the operation-side first shaft 3. The box 2 is integrally provided at the tip of the second shaft 4 on the non-operation side. Then, the operation-side first shaft 3 and the non-operation-side second shaft 4
Is a torque transmitting pin 6 which is fitted through and fixed in the radial direction.
Are connected integrally so that they cannot rotate relative to each other.

The opening / closing operation rod of the valve is, for example, shown in FIG.
Is used for opening and closing a gate valve 8 provided in a water supply pipe 7 shown in FIG. That is, an opening / closing operation cap (projecting square end) 10 is attached to the upper end of the valve stem 9 of the gate valve 8, and the opening / closing operation cap 10 is attached to the opening / closing operation rod of the valve shown in FIG. After the square concave portion 2A of the box portion 2 is externally fitted from above, a handle 5 for opening and closing operation is provided.
By gripping and rotating in the forward and reverse directions, the valve stem 9
Can be simultaneously rotated in the forward and reverse directions to open and close the gate valve 8.

[0004] With the valve opening / closing operation rod configured as described above, an excessive torque exceeding a set value during the opening / closing operation is applied to the gate valve 8.
In order to prevent the gate valve 8 from being damaged by being loaded on the torque transmission pin 6, the cross-sectional area of the torque transmission pin 6 is set so that the torque transmission pin 6 is sheared by the excessive torque. That is, in the conventional valve opening / closing operation rod, the torque transmission pin 6 is provided with a shear pin (shear pin) function to protect the gate valve 8.

[0005]

Although the gate valve 8 can be prevented from being damaged by the shearing of the torque transmitting pin 6, when the valve operating rod is used again, the complicated procedure of replacing the torque transmitting pin 6 is required. In addition to the need for complicated work, in order to securely fit and fix the torque transmission pin 6 through the radial direction between the first operating shaft 3 and the second non-operating shaft 4, the sheared torque is required. A torque transmission pin 6 having a larger diameter than the transmission pin 6 must be used as a replacement. For this reason, there is a concern that excessive torque exceeding the set value may be applied to the gate valve 8 and damage the gate valve 8.

On the other hand, as another protection means for preventing the gate valve 8 from being applied with excessive torque and preventing damage, a torque transmission pin (not shown) having a shear pin function is provided by a valve stem shown in FIG. A slip device (not shown) is provided on the first means or the opening / closing operation cap 10 for connecting the opening / closing operation cap 9 and the opening / closing operation cap 10 so that the slipping device cannot be rotated when the torque at the time of opening / closing operation exceeds a set value. A second means for slipping and preventing damage to the gate valve 8 is known. However, these first and second means have to be attached to each of the gate valves 8 which are frequently used, which complicates the structure of the gate valves 8 and increases the cost. Moreover, the existing gate valve 8 is not configured to provide protection by employing any of the first and second means. These facts can be applied not only to the gate valve 8 described above but also to other valves such as a butterfly valve and a ball valve.

Therefore, the present invention avoids the use of torque transmission pins on the valve operating and operating rod side and on the valve side, and eliminates the need for complicated replacement work of torque transmission pins. Without providing a device, the opening / closing operation rod of one valve can be adapted to the opening / closing operation of a large number of valves, thereby preventing each valve from being applied with excessive torque and protecting the valve by avoiding its damage. An object of the present invention is to provide a valve operating rod.

[0008]

In order to achieve the above object, a valve opening / closing operation rod according to the present invention comprises: a box portion provided with a rectangular recess which can be externally fitted to a protruding rectangular end on the valve side; An opening / closing operation rod for a valve having an operation shaft portion provided so as to be interlocked with the box portion and rotating the box portion in the opening and closing direction of the valve, wherein the operation shaft portion and the box portion are connected via a slip device. Simultaneously rotatably connected to each other, the slip device is slipped when a torque exceeding a set value is applied to the box portion at the time of opening and closing the valve, so that the operation shaft portion and the box portion are relatively rotated. It is characterized by being constituted.

According to the present invention, when the torque at the time of opening / closing the valve exceeds a set value, a slip occurs in the slip device, and the rotation transmission from the operation shaft portion to the box portion is interrupted.
As a result, the operation shaft and the box rotate relatively. That is, only the operation shaft rotates and the box stops. For this reason, it is possible to prevent an excessive torque from being applied to the valve, and to prevent and protect the valve from being damaged.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example will be described with the same reference numerals. FIG. 1 is a front view showing an embodiment of the present invention. In FIG. 1, the valve opening / closing operation rod includes an operation shaft portion 1 and a box portion 2 provided with a tapered square hole 2A. The operation shaft portion 1 is made of a solid metal rod, and a handle 5 for opening and closing operation is integrally provided at a rear end thereof. The box 2 is connected to the tip of the operation shaft 1 via a slip device 11 so as to be simultaneously rotatable.

[0011] As shown in FIG.
A metal shell 12, a plurality of disc springs 13, 13,..., A metal upper ring 14, a metal lower ring 15, a metal cap 16, a torque adjusting push bolt 17, a pressing plate 18, rubber A seal ring 19 made of an elastic material such as a metal box 2 is incorporated.

As shown in FIGS. 3 and 4, the shell 12 is formed in the shape of a downwardly-facing cup having a polygonal (eg, octagonal) inner surface, and an annular portion 12B protrudes upward from a ceiling portion 12A. At the center of the annular portion 12B, that is, at the center of the ceiling 12A, a screw hole 12C for screwing a bolt is provided vertically penetrating therethrough. Further, a female screw 12D having a larger diameter than the octagonal inner surface is provided on the inner surface of the lower end opening.

As shown in FIGS. 5 and 6, the upper ring 14 has an outer shape that can be fitted to the octagonal inner surface of the shell 12;
An inner diameter slightly larger than the outer diameter of the box portion 2 is provided, and an annular uneven portion 14A is formed on the lower surface thereof. As shown in FIG. 7, the annular concave-convex portion 14A has a plurality of downward convex portions formed by flat surfaces formed at a predetermined interval in the circumferential direction and orthogonal to the axis C of the upper ring 14. 14a1, 14a1... And a plurality of these convex portions 14a
, A plurality of recesses 14a2, 14a2... Formed continuously between the plurality of recesses 14a1,.
, 14a2... Are projected toward the intermediate line C1 at the other end of the projection 14a1 adjacent to one end of the projection 14a1.
The first slope 14aD1 which is inclined upward at one end of the first slope 14aD1
And a second inclined surface 14aD2 that is inclined upward from the other end of the convex portion 14a1 toward the intermediate line C1, and is formed symmetrically with the intermediate line C1 as a symmetric axis.

The lower ring 15 is made of the same product having the same structure and dimensions as the upper ring 14.
4 is used with the annular uneven portion 14A facing downward, while the lower ring 15 is used with the annular uneven portion 15A facing upward. Therefore, FIG. 5 and FIG.
Only the reference numerals corresponding to the lower ring 15 and the annular concavo-convex portion 15A are given, and the duplicate description will be omitted.

As shown in FIGS. 8 and 9, the cap 16 is a ring-shaped one having an external thread 16A which can be screwed to the internal thread 12D of the shell 12, and has two detachable recesses 16B, 16B. Are provided to open downward.

In FIG. 2, the push bolt 17 for torque adjustment is a bolt with a square hole, and is screwed through a screw hole 12C for screwing a bolt provided in the ceiling 12A of the shell 12 from the upper side. And presses the disc spring 13 through the pressing plate 18 at the tip.

On the other hand, the box section 2 corresponds to FIGS.
As shown in FIG. 1, a cylindrical member penetrating through the tapered square hole 2A is provided with a flange portion 2B extending radially outward from a central portion in the axial direction, and a seal is provided on the outer periphery of the lower end portion. A ring fitting hole 2C is provided. The inner and outer diameters of the flange portion 2B are the upper ring 14 and the lower ring 1.
5 is set to be substantially the same as the inner and outer diameters of the annular concave and convex portions 14A and 15A, and on the upper surface thereof, as shown in FIG. 12, engages with the annular concave and convex portion 14A of the upper ring 14 described in FIG. An annular uneven portion 2D is formed, and an annular uneven portion 2E that meshes with the annular uneven portion 15A of the lower ring 15 is formed on the lower surface as shown in FIG.

The slip device 11 shown in FIG. The pressing plates 18,. Multiple disc springs 1
3,13 ...,. The upper rings 14,. The box parts 2,... In which the seal ring 19 is fitted and attached to the seal ring fitting hole 2C. After these are loaded in the order of the lower ring 15, the male screw 16A of the cap 16 is screwed into the female screw 12D of the shell 12, and the cap 16 is removably fastened and fixed to the opening at the lower end of the shell 12. Then, a torque adjusting push bolt 17 is screwed from above into a bolt screwing screw hole 12C provided in the ceiling 12A of the shell 12, and the tip thereof presses the disc spring 13 via the pressing plate 18.

The fastening and fixing of the cap 16 can be easily performed by using a tool such as a spanner having a projection which can be fitted into the two detachable concave portions 16B, 16B. Further, by inserting the box portion 2, the annular uneven portion 2D formed on the upper surface of the flange portion 2B of the box portion 2 is moved relative to the annular uneven portion 14A of the upper ring 14 already installed. As shown in FIG. 12, the lower ring 15 is inserted into the lower ring 15 so that the annular concave and convex portion 15A formed on the upper surface of the lower ring 15 is fitted to the flange of the box portion 2 already inserted. The annular concave and convex portion 2E formed on the lower surface of the portion 2B is engaged. Further, a pressing plate 18 is provided by a pressing bolt 17 for torque adjustment.
By adjusting the pressing force against which the disc spring 13 is pressed, the spring force of the disc springs 13 is changed.
An annular uneven portion 2D formed on the upper surface of the flange portion 2B of the box portion 2 and an annular uneven portion 14 of the upper ring 14
A (Friction) and Flange 2B
The engagement strength (frictional force) between the annular uneven portion 2E formed on the lower surface of the lower ring 15 and the annular uneven portion 15A of the lower ring 15 can be adjusted and set.

As shown in FIG. 1 and FIG. 2, the slip device 11 having the above-described configuration is configured such that a connecting plate 20 integrally provided at the lower end of the operating shaft portion 1 is mounted on the annular portion 12B, and a plurality of The connecting plate 20 is integrally fixed to the operating shaft portion 1 by fastening and fixing the connecting plate 20 to the annular portion 12B by the fastening bolts 21, 21,..., And the operating shaft portion 1 and the box portion 2 incorporated in the slip device 11 They will be connected to each other via the device 11 so as to be interlocked.

With such a configuration, for example, FIG.
An opening / closing operation cap (projecting square end) 10 attached to an upper end of a valve rod 9 of a gate valve 8 provided in a water supply pipe 7 shown in FIG. After the square recess 2A of the box portion 2 of the rod is externally fitted from above, the handle 5 for opening and closing operation shown in FIG. 1 is gripped and rotated in the forward and reverse directions, and the valve stem 9 is simultaneously rotated in the forward and reverse directions. The gate valve 8 can be opened and closed. That is, the rotation of the operation shaft 1 in the forward and reverse directions is performed by the (connection plate 20) →
(Metal shell 12) → (upper ring 14 and lower ring 15) → (annular uneven portion 14A of upper ring 14)
→ The annular uneven portion 2D of the box portion 2 and the lower ring 1
4 is transmitted to the box 2 through the transmission path of the annular uneven portion 15A → the annular uneven portion 2E) of the box portion 2 to rotate the box portion 2 in the forward and reverse directions to open and close the gate valve 8. Can be.

When the torque at the time of opening / closing the gate valve 8 exceeds a set value, a slip occurs in the slip device 11, and the rotation transmission from the operation shaft portion 1 to the box portion 2 is interrupted. That is, the torque that can respond to the opening / closing operation of the gate valve 8 is determined by the spring force of the plurality of disc springs 13, 13, and the annular unevenness formed on the upper surface of the flange portion 2 </ b> B of the box portion 2 by the spring force. The engagement strength (frictional force) between the portion 2D and the annular uneven portion 14A of the upper ring 14, the annular uneven portion 2E formed on the lower surface of the flange portion 2B, and the annular uneven portion 15A of the lower ring 15 When the torque at the time of opening and closing the gate valve 8 exceeds a set value, the torque at the time of opening and closing the opening of the gate valve 8 becomes larger than the above-mentioned engaging strength. A circumferential slip occurs between the portion 2D and the annular uneven portion 14A and between the annular uneven portion 2E and the annular uneven portion 15A, and the operation shaft portion 1, the shell 12, the upper ring 14, and the lower ring 15 You Such as micro cap 16 idles, the box portion 2 is held in the stopped state, operating shaft 1 and the box portion 2 is able to rotate relative to each other.

Therefore, unlike the conventional valve opening / closing operation rod shown in FIG. 14, the use of the torque transmitting pin 6 can be avoided, and the complicated operation of replacing the torque transmitting pin 6 can be eliminated. Further, a slip device is attached to the first conventional means or the opening / closing operation cap 10 in which the valve rod 9 of the conventional gate valve 8 and the opening / closing operation cap 10 shown in FIG. As in the second conventional means provided with an unillustrated (not shown), each of the gate valves 8 used in large numbers is not provided with a torque transmitting pin or a slip device, and a large number of open / close operation rods of one valve are used. By adapting to the opening / closing operation of the gate valve 8, it is possible to prevent an excessive torque from being applied to each gate valve 8 and to protect the gate valve 8 by avoiding its damage.

On the other hand, by adjusting the pressing force with which the disc spring 13 is pressed via the pressing plate 18 by the torque adjusting push bolt 17, the spring force of the disc springs 13, 13,. The value of the torque corresponding to the opening / closing operation of the valve 8 can be variously adjusted and set. That is, as the push bolt 17 increases the amount of protrusion from the screw hole 12C for screwing toward the pressing plate 18, the spring force of the disc springs 13, 13,... As the amount of torque that can be increased is increased, and conversely, as the amount of protrusion is reduced, the spring force of the disc springs 13, 13,. It is possible to sufficiently open and close the gate valve 6 of a specification designed to be opened and closed by a high torque exceeding the set maximum value, so that its use range can be expanded. Can be.

In the above embodiment, the opening and closing operation of the gate valve 8 has been described. However, the valve operating rod of the present invention is not limited to the gate valve 8 but may be a butterfly valve or a ball valve. It can be applied to opening and closing other valves.

[0026]

As described above, since the opening / closing operation rod of the valve according to the present invention is constituted, the following special effects can be obtained.

That is, when the torque at the time of opening / closing the valve exceeds a set value, a slip occurs in the slip device, and the rotation transmission from the operation shaft to the box is cut off, and the box is stopped. For this reason, it is possible to prevent an excessive torque from being applied to the valve, and to prevent and protect the valve from being damaged. In addition, the use of torque transmitting pins on the valve opening / closing operation rod side and the valve side is avoided, and complicated replacement work of the torque transmitting pins is not required. The opening / closing operation rod of one valve can be adapted to the opening / closing operation of a large number of valves, thereby preventing the excessive torque from being applied to each valve and preventing and protecting the valves from being damaged.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view showing a main part of the present invention.

FIG. 3 is a half sectional view of a shell.

FIG. 4 is a view as viewed in the direction of arrows AA in FIG. 3;

FIG. 5 is a half sectional view of the upper ring.

FIG. 6 is a view taken in the direction of arrows BB in FIG. 5;

FIG. 7 is an enlarged development view of an annular uneven portion.

FIG. 8 is a half sectional view of a cap.

9 is a view as viewed in the direction of arrows CC in FIG. 8;

FIG. 10 is a half sectional view of a box portion.

FIG. 11 is a view as viewed in the direction of the arrow DD in FIG. 10;

FIG. 12 is an enlarged development view showing the engagement between the annular uneven portion of the box portion and the annular uneven portion of the upper ring.

FIG. 13 is an enlarged development view showing the engagement between the annular uneven portion of the box portion and the annular uneven portion of the lower ring.

FIG. 14 is a front view showing an example of a conventional valve opening / closing operation rod.

FIG. 15 is a structural explanatory view illustrating a partition valve and a valve stem of a water supply pipe applied to use of a valve opening / closing operation rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation shaft part 2 Box part 2A Tapered square hole (square concave part) 8 Gate valve (valve) 10 Opening / closing operation cap (projecting square type end) 11 Slip device

Claims (1)

[Claims] 1. A box portion provided with a rectangular recess that can be fitted to the outside at a protruding square-shaped end portion on a valve side, and an operation provided to be interlocked with the box portion to rotate the box portion in the opening and closing direction of the valve. An opening and closing operation rod for a valve having a shaft, wherein the operation shaft and the box are connected to each other via a slip device so as to be simultaneously rotatable, and a torque exceeding a set value is applied to the box when the valve is opened and closed. A valve opening / closing operation rod configured to cause the slip device to slip when a load is applied, thereby causing the operation shaft portion and the box portion to rotate relative to each other.