JP2009204053A - Lock device for rotary valve lever handle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock device hardly to be found while preventing the intentional or careless operation of a rotary valve provided outdoors such as a farmland. <P>SOLUTION: The lock device for a rotary valve lever handle is constituted in such a manner that a female screw 20 is provided on a long cylinder body 19 with a head mounted in the thickness direction of a lever handle 11 for the rotary valve on which a valve element 8 is rotatably provided via a stem 9, and a bolt 21 mounted in a journal flange 10 in an embedded state is threaded to the female screw 20, whereby the lever handle 11 is fastened to a body 7 to lock the lever handle 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a locking device for a rotary valve lever handle, and more particularly to a locking device for a rotary valve lever handle used for water supply in farmland or fields.

  When water cannot be supplied directly from a river or the like for irrigating the farmland, a water supply facility from the water main is necessary. For example, a water supply device is installed near the farmland to supply water to the farmland.

In such a water supply device, when water supply is stopped for some reason, a valve such as a butterfly valve provided in the water supply device is closed to stop water supply.
However, this type of valve used for irrigation in the field, for example, if the valve is deliberately operated for the purpose of stealing and the water supply is resumed, the valve will be opened carelessly. The purpose of stopping water supply will not be achieved.

  Therefore, various countermeasures for restricting the operation of the butterfly valve have been conventionally taken. For example, as disclosed in Patent Document 1, a padlock is attached to the lever handle, and as disclosed in Patent Document 2, a lock device is provided at a grip portion of the lever handle.

  In Patent Document 1, a lever handle having a lock lever is attached to the stem of the butterfly valve, a plate for locking the lock lever is fixed to the stem projecting surface, and the lock lever engaging portion is operated by operating the lever handle. A lever handle for operating the butterfly valve by engaging the engaging portion of the plate is shown. A lock hole with the lower surface of the lever handle almost touching is provided on the grip part of this lock lever, and the lock lever's grip part is restricted from being pulled toward the lever handle by locking the padlock. The locking device locks the lever handle of the butterfly valve because the engaging portion of the lever with the plate cannot be removed.

  In Patent Document 1, a lever handle is provided on the stem of the butterfly valve, and a locking arm provided with a locking hole for locking the padlock is attached to the lever handle immediately below, and the stem protruding surface is locked to the stem protruding surface. A butterfly valve with a fixed plate for locking the lever is shown. This plate has a locking hole at a position opposite to the locking hole of the locking arm, and the locking hole provided in this plate is locked when the lever handle comes to the fully closed position, for example. By providing it at a possible position, it is a locking device that locks the locking holes when the lever handle comes to the fully closed position, restricts the operation of the lever handle, and thus locks the lever handle of the butterfly valve.

Patent Document 2 discloses a lever handle locking device in which a lever handle is fixed to an upper end portion of a stem of a butterfly valve and a lock member is provided at a lower portion of a grip portion of the lever handle.
This lock device is provided with a lock member having a length up to the vicinity of the flange portion at the lower part of the handle portion of the lever handle in a state in which the handle portion of the lever handle is not gripped, and the lock member is elastically elastic. A plurality of locking holes are formed in a substantially concentric circle on the flange, and the rod is locked to the locking holes to operate the lever handle at an arbitrary position. Is a lock device that locks the movement of the lever handle of the butterfly valve.

Japanese Utility Model Publication 2-74683 JP 2006-266394 A

  However, in the locking device shown in Patent Document 1, when the lever handle is intentionally operated, the padlock can be easily cut or broken by using a cutting tool or the like, and for the purpose of stopping water supply or the like. The effect is not enough. In particular, since the locking device can be easily visually recognized from the outside, it is easy to take a means for removing the locking device intentionally. In addition, the use of padlocks has led to the cost of padlocks, and when the number of butterfly valves to be locked increases, there has been a problem that management of keys, management of dial PIN numbers, and the like become burdensome.

  Furthermore, in addition to the problems associated with using padlocks, the locking device provided with a locking arm has the adverse effect of increasing the work load and the number of parts, such as mounting the locking arm and processing the plate. In the case of a butterfly valve using an arm, there is a problem that it can not be dealt with by exchanging only the lever handle unless the plate portion is provided with a locking hole facing the locking arm.

  In Patent Document 2, it is possible to prevent the lever handle from being moved inadvertently, but it is possible to operate the lever handle by grasping the grip portion, and the lock structure can be easily visually recognized from the appearance. It is impossible to prevent the situation.

  The present invention has been developed as a result of diligent research in view of the above problems, and its purpose is to prevent a rotary valve provided on farmland or the like from being operated intentionally or carelessly. An object of the present invention is to provide a locking device in which the locking device is difficult to find from the appearance.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a valve body in a body is rotatably provided via a stem, and a lever handle is fixed to the stem mounted on a shaft mounting flange of the body. In the rotary valve, a female thread portion is provided in the long cylindrical body with the head inserted in the thickness direction of the lever handle, and a bolt inserted in the shaft mounting flange is screwed into the female thread portion. Thus, there is provided a locking device for a rotary valve lever handle, wherein the lever handle is locked by fastening the lever handle to the body.

  According to a second aspect of the present invention, there is provided a lock for a rotary valve lever handle in which an insertion hole having an engaging step portion is formed in the lever handle, and a long cylindrical body with a head is embedded in the insertion hole. Device.

  According to a third aspect of the present invention, there is provided a locking device for a rotary valve lever handle in which a charging cylinder is suspended from the bottom of a charging hole of the lever handle, and the long cylindrical body is inserted into the charging cylinder. is there.

  According to a fourth aspect of the present invention, there is provided a locking device for a rotary valve lever handle in which one or both of a bolt head and a long cylinder head can be operated only through a special tool.

  According to the first aspect of the present invention, the long cylindrical body having the female thread portion is inserted in the thickness direction of the lever handle, and is screwed with the bolt inserted in the shaft mounting flange of the rotary valve body. Therefore, the lever handle can be fastened to the body and locked, and the head part of the bolt is embedded in the shaft flange, and the screw part of the bolt is screwed into the long cylindrical body. Since it is difficult to visually recognize the locking device, it is not possible to easily remove the locking device even if the lever handle is intentionally operated, and to obtain a locking device in which the lever handle is not inadvertently operated. Can do.

  In addition, the long cylindrical body and the bolt are detachably inserted, and the bolt is screwed into the long cylindrical body having a female thread inside, so when one is turned, the other rotates together. Therefore, the locking device is suitable for an inadvertent operation because it cannot be removed unless the other is rotated while fixing one.

According to the second aspect of the present invention, since the insertion hole is provided in the lever handle so that the long cylindrical body can be inserted in the embedded state, the long cylindrical body has a case where the lever handle is viewed from the operation direction of the rotary valve. It is completely buried and difficult to discover from the exterior. This makes it difficult to find the locking device even if the lever handle is intentionally operated, and the effect is particularly remarkable in a narrow place in a concrete pit installed outdoors such as a field.
Further, since the insertion hole is provided with a step at the bottom, the long cylindrical body can be locked to the lever handle at a predetermined position.

  According to the third aspect of the present invention, the cylindrical portion of the long cylindrical body and the bolt are formed by suspending the cylindrical portion into which the long cylindrical body can be inserted at the lower portion of the insertion hole provided in the lever handle. Since the lock device is not exposed from the outside, it is more difficult to find the lock device from the outside, and it is difficult to remove the lock device. Moreover, since the lock device is covered with the cylindrical portion, it is more difficult to attach and detach the lock device. In addition, there is no fear that the long cylindrical body and the bolt can be visually recognized from the outside, and the durability is maintained by protecting the lock device itself in the outdoors, and the design of the entire lever handle is also improved. .

According to the invention of claim 4, the lock structure cannot be operated with a general-purpose product such as a normal driver, and the heads of both the long cylindrical body and the bolt can be operated only with a special tool. Is a locking device that cannot be unlocked without each special tool.
In particular, the inside of a concrete pit installed outdoors is often quite narrow, and the removal work at such a place is very difficult.

A preferred embodiment of a locking device for a lever handle for a rotary valve according to the present invention will be described with reference to the drawings.

  FIGS. 1-5 shows the example which provided the butterfly valve 3 as a main valve in the water meter unit 2 in the narrow concrete pit 1 installed in the farmland etc. FIG. In FIG. 1, 4 is a metering water meter, 5 is a control valve, and 6 is a water distribution port.

  2 is an exploded perspective view of the butterfly valve 3, FIG. 3 is a plan view showing the lever handle and the plate portion, and FIG. 4 is a partially cutaway front view showing the lock device portion. FIGS. 5A and 5B are a plan view and a cross-sectional view of the locking device.

  2 and 4, a disk-like disc (valve element) 8 is rotatably provided on a short cylindrical body 7 via a stem 9. A shaft mounting flange 10 is provided at the upper end portion of the shaft mounting portion 7a of the body 7, and the tip end portion of the lever handle 11 is provided at the upper end portion of the stem 9 mounted on the shaft mounting portion 7a on the upper portion of the body 7. Is fixed.

  An insertion hole 13 having an opening 12 on the upper side is formed in the thickness direction (the axial direction of the stem 9) on the tip shaft attachment portion side of the lever handle 11, and is engaged with the bottom of the insertion hole 13. A step 14 is provided, and at the bottom of the charging hole 13, a charging cylinder 15 having an inner diameter smaller than that of the charging hole 13 is integrally suspended, and the charging hole 13 and the charging cylinder 15 are In FIG. 4, a communication hole is formed that communicates along the vertical direction (the axial direction of the stem 9) so that it can be inserted. The lower end portion of the charging tube portion 15 is suspended from a position close to the upper surface of the plate 16 described later. Therefore, when the lever handle 11 is set to the fully closed position, the lever handle 11 is formed in the insertion hole 13, the insertion tube portion 15, the communication hole 18 formed in the plate 16 described later, and the shaft mounting flange 10 described later. The bolt mounting hole 17 maintains a state where it communicates along the vertical direction in FIG.

  Further, the shaft mounting flange 10 is provided with a bolt mounting hole 17, and this mounting hole 17 uses a mounting hole for mounting a plate 16 for an automatic actuator or a handle operating machine on the shaft mounting flange 10. . The mounting hole 17 may be formed as a dedicated hole for bolt mounting.

  The bolt mounting hole 17 faces the lower end of the loading cylinder portion 15 of the lever handle 11 when the lever handle 11 is set on the stem 9 of the butterfly valve 3 in the fully closed position as shown in FIG. Provided in position. The shaft flange 10 is fixed by a bolt 29, and a plate 16 having a plurality of locking grooves 16a on the outer periphery thereof is fixed. The plate 16 has a communication hole 18 at a position facing the bolt mounting hole 17. Forming.

4 and 5 includes a long cylindrical body 19 with a head portion 19a, a screw 20 provided on the long cylindrical body 19, and a bolt 21 screwed into the female screw 20. Has been.
As shown in FIG. 4, when the long cylindrical body 19 is inserted through the opening 12 of the insertion hole 13, the long cylinder 19 is engaged with the engagement step portion 14 with the head portion 19 a embedded in the insertion hole 13. The female screw 20 of the long cylindrical body 19 and the communication hole 18 of the plate 16 face each other, and the bolt 21 inserted from the bolt mounting hole 17 is screwed into the female screw 20 through the communication hole 18. The head 21a of the bolt 21 is engaged with the outer peripheral portion of the communication hole 18 of the plate 16 in a state of being embedded in the bolt mounting hole 17 of the shaft mounting flange 10, and the female screw 20 of the long cylindrical body 19 and the bolt 21 can be screwed together. Thereby, the body 7 and the lever handle 11 are fastened through the lock device. Even if the lever handle 11 is to be rotated in this state, the bolt 21 constituting the locking device is accelerated in the communication hole 18 of the plate 16 and cannot be rotated. Therefore, the lever handle 11 is inadvertently operated. It will not be done.

As shown in FIGS. 5 (a) and 5 (b), by providing one or both of the long cylindrical body 19 and the heads 19a, 21a of the bolt 21 so that they can be operated only through a special tool, unlocking becomes difficult. ing. For example, by using the head 19a, 21a with a screw with a hexalobular hole, a screw with a hexalobular hole with a projection, or other screws having a special head structure, the lock device cannot be unlocked inadvertently. .
Depending on the implementation, these head shapes may be hexagonal heads or cross hole heads, but in order to make unlocking difficult, long cylinders with specially structured heads Body and bolts are desirable.

  Moreover, even if it is going to remove any one of the long cylinder 19 and the volt | bolt 21 using a tool, the said bolt 21 and the elongate cylinder 19 are the plate 16 and the insertion hole 13, respectively. Since the long cylindrical body 19 and the bolt 21 are always in a co-rotating state, the bolt 21 is removed from the long cylindrical body 19 even when it is further removed. Since it cannot be removed, unlocking can be made more difficult.

The caps 25 and 26 shown by the alternate long and short dash line in FIG. 4 are for covering the opening 12 and the communication hole 18, and it is difficult to find the lock device from the outside by covering the cap 25 and 26. Is preventing deterioration.
In the figure, A and B are special tools, and if the head of the locking device has a special shape, such as the protruding hexalobular hole 22 shown in FIG. 5, a special tool corresponding to this is prepared. To do. In the figure, 28 is a bolt for fixing the lever handle 11 to the upper end of the stem 9, 27 is a lid, 11a is a stopper lever for locking the tip to the locking groove 16a of the plate 16. , 11b is a shaft attachment portion, and 11c is a spring.

Next, how to lock the above locking device and how to remove the lock will be described.
As shown in FIG. 4, the lever handle 11 is rotated to the fully closed position to bring the butterfly valve 3 into the fully closed state. At this time, the center of the insertion hole 13 of the lever handle 11, the bolt mounting hole 17 of the shaft mounting flange 10 and the communication hole 18 of the plate 16 are in a concentric state, and each hole is in a communication state along the vertical direction in FIG. Become

  In this state, when the long cylindrical body 19 is inserted into the insertion hole 13 and the insertion cylinder portion 15 of the lever handle 11, the head 19 a of the long cylinder 19 is provided at the bottom of the insertion hole 13. It is inserted while being engaged with the stepped portion 14.

  On the other hand, a bolt is inserted from below the bolt mounting hole 17 of the shaft mounting flange 10, and the long cylindrical body with a special tool (dedicated driver) corresponding to the head 19 a of the long cylindrical body 19 and the head 21 a of the bolt 21. 19 and the bolt 21 are screwed together.

  At this time, the head of the bolt 21 is buried and hidden in the mounting hole 17 of the shaft mounting flange 10, and the body portion 23 of the long cylindrical body 19 is covered with the insertion tube portion 15 and is long. The head portion 19a of the scale cylinder 19 is buried in the insertion hole 13 and completely hidden, and the locking device cannot be seen from the outside. As shown in FIG. 4, it is securely locked while maintaining the fully closed position.

  Next, to unlock the lever handle 11, the long cylinder 19 and the bolt 21 are loosened by loosening the head 19a of the long cylinder 19 and the head 21a of the bolt 21 using two kinds of special tools. The locking device can be unlocked by removing the long cylindrical body 19 from the insertion hole 13 and removing the bolt 21 from the mounting hole 17 of the shaft mounting flange 10.

  In this state, the stop lever 11a is removed from the locking groove 16a of the plate while holding the lever handle 11, and the lever handle 11 is appropriately rotated so that the butterfly valve can be operated at an appropriate angle in the opening direction. Become.

Here, the state where the butterfly valve equipped with the lever handle locking device for the rotary valve configured as described above is connected to the water meter unit 2 shown in FIG. 1 and installed in the concrete pit 1 will be described. .
The concrete pit 1 is a frame having a square cross section installed on the ground, and a water meter unit 2 is built in the frame. In FIG. 1, this state is illustrated from the top toward the ground.
The water meter unit 2 is connected to a water supply pipe (not shown) piped in a vertical direction with respect to the ground, and the butterfly valve 3 is connected to the water supply pipe in an orthogonal direction. FIG.
Shows a state in which the butterfly valve 3 is in the fully closed position, and when irrigating the field, the lever handle 11 of the butterfly valve 3 is rotated 90 degrees upward to be in the fully open state. Water is discharged from the water distribution port 6 through the water meter 4 and the control valve 5.
Therefore, a person who intends to operate the butterfly valve 3 connected to the water meter unit 2 sees the lever handle 11 from the side as the operation direction of the rotary valve. Since it is completely buried by the in-tube portion 15 and the shaft mounting flange 10, it is difficult to find out from the appearance. Therefore, even if the lever handle 11 is intentionally operated, the locking device cannot be easily removed, and the lever handle 11 is not inadvertently operated.

  Next, another example of the locking device according to the present invention will be described with reference to FIG. 4 that are the same as those in the embodiment shown in FIG.

In FIG. 6, an insertion hole 13a is sectioned on the tip fixing portion side of the lever handle 11, and an engagement step 14a and an insertion hole 14b are formed at the bottom of the insertion hole 13a.
As in the previous example, when the butterfly valve is in the fully closed position, the insertion hole 13a, the insertion hole 14b, the communication hole 18a, and the bolt mounting hole 17a are communicated along the vertical direction in FIG. The long cylindrical body 19 and the bolt 21 can be screwed together and locked.

  In this example, there is no portion corresponding to the insertion tube portion 15 in FIG. 4, but in this case as well, the long tubular body 19 with a head is embedded in the lever handle 11, and the bolt 21 is also a shaft as in the above example. The lock device embedded in the mounting flange 10 and composed of the long cylindrical body 19 and the bolt 21 is embedded in each head, so that it is not visually recognized from the outside and is longer than the side of the butterfly valve 3. Since only the body part 23 of the scale cylinder 19 can be visually recognized and the screw structure cannot be confirmed from the external appearance, it is difficult to confirm the lock device itself from the outside.

FIG. 7 shows still another example of the locking device according to the present invention. The same parts as those in the embodiment in FIG.
In FIG. 7, an insertion hole 30 is formed through the distal end surface of the lever handle 34, and a long cylindrical body 31 having a head portion 31 a is inserted into the insertion hole 30, and the communication hole 17 b of the shaft mounting flange 10 is inserted. A bolt 32 with a head portion 32a is inserted into and locked with a special tool as in the above example.

In this case, the head of the bolt 32 is embedded in the mounting hole 17b and the long cylindrical body 31 is the same as the above example except that the head 31a of the long cylindrical body 31 is exposed on the surface of the lever handle 34. Since the female screw 20a cannot be visually recognized from the external appearance and only the body portion 32 of the long cylindrical body 31 can be visually recognized from the external appearance of the butterfly valve, it cannot be recognized as a locking device from the outside. This is the same as the above example. Further, in this embodiment, the locking device can be provided simply by providing the insertion hole 30 in the lever handle 34. Therefore, the insertion hole 30 can be formed only by drilling the hole using a general-purpose lever handle. The cost can be reduced as compared with the above example.
In the figure, 22a is a hexalobular hole, 20a is a female screw, and 24a is a male screw.
In any of the embodiments, the long cylinder is disposed on the lever handle side and the bolt is disposed on the shaft flange side. However, the bolt is disposed on the lever handle side and the long cylinder body is disposed on the shaft flange side. You may do it.

  The present invention is a locking device for a lever handle for a rotary valve used in a rotary valve, and its use is not limited to a butterfly valve, and can be applied to, for example, a ball valve, and a water meter installed for irrigation purposes such as farmland It can be applied not only to the case where it is built in, but also to rotary valves used for other piping, etc., and it can be applied to both indoors and outdoors, such as factory plants, piping equipment, air conditioning equipment, etc. The present invention can also be applied to various types of rotary valves used.

It is the schematic where the water meter unit which provided the butterfly valve which provided the locking device of this invention was installed in the concrete pit. It is a disassembled perspective view which applied the locking device of the present invention to a butterfly valve. It is the top view which showed the lever handle and the plate part. It is a partially omitted cutaway sectional view in which the locking device of the present invention is applied to a rotary valve. (A) It is a top view of an elongate cylinder. (B) It is explanatory sectional drawing of the state which screwed the volt | bolt to the elongate cylinder. It is a partially omitted cutaway sectional view of another embodiment of the present invention. It is a partially cutaway sectional view of still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete pit 3 Butterfly valve 7 Body 8 Valve body 9 Stem 10 Shaft mounting flange 11 Lever handle 13 Insertion hole 14 Engagement step part 17 Mounting hole 18 Communication hole 19 Long cylindrical body 19a, 21a Head 20 Female thread 21 Bolt 23 Body A, B Special tool

Claims (4)

  A rotary valve in which a valve body in a body is rotatably provided via a stem, and a lever handle is fixed to the stem mounted on a shaft mounting flange of the body, the head inserted in the thickness direction of the lever handle. A long cylindrical body with a part is provided with a female thread part, and the lever handle is fastened to the body by screwing a bolt inserted into the shaft mounting flange into the female thread part to lock the lever handle. A locking device for a lever handle for a rotary valve.   2. A locking device for a lever handle for a rotary valve according to claim 1, wherein an insertion hole having an engaging step portion is formed in the lever handle, and a long cylindrical body with a head is embedded in the insertion hole. .   The locking device for a lever handle for a rotary valve according to claim 1 or 2, wherein a charging cylinder is suspended from a bottom of the charging hole of the lever handle, and the long cylinder is inserted into the charging cylinder. .   The locking device for the rotary valve lever handle according to any one of claims 1 to 3, wherein one or both of the head of the bolt and the head of the long cylindrical body can be operated only through a special tool.

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