JP2987808B2 - Opening adjustment mechanism of valve drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening adjustment mechanism of a valve driving device used for a rotary valve such as a butterfly valve or a ball valve that opens and closes by rotating a valve body by approximately 90 degrees.

[0002]

2. Description of the Related Art As means for rotating a valve body of a valve, there is a valve drive device for opening and closing the valve by transmitting the rotational movement of an operation handle to a valve shaft of the valve via a worm gear. As shown in FIG. 6, a worm wheel 52 and a worm 53 that constitute a worm gear are engaged with each other, disposed in the casing 51, and a shaft portion 53a of the worm 53 is extended to project outside the casing 51. In some cases, an operation handle 54 is fixed to an end of a portion 53a, and a shaft hole 52c for fitting a valve stem of a valve to a worm wheel 52 is provided.

As shown in FIG. 5, the conventional opening adjustment mechanism used in the gear-type valve driving device described above has a structure in which the worm wheel 52 rotates in the direction of rotation of the worm wheel 52 when the valve is substantially fully opened and fully closed. Each end face 52a, 52b is attached to a side wall 51b of the casing 51 facing the common face.
a, 52b are drilled in two places so as to face the bolts 52a and 52b.
Then, an adjusting bolt 56 is screwed into the bolt through-hole 55 so that the tip projects into the casing.
The rotation angle of the worm wheel 52 is adjusted by the protrusion length of the worm wheel 6. A nut 58 is fastened to the other end of the adjusting bolt 56 with a washer 57 interposed between the adjusting bolt 56 and the casing 51.

This opening adjustment mechanism is usually used to obtain a fully closed state and an appropriate opening degree (including a fully opened state). For example, when the fully closed state is changed to the fully opened state, the rotation direction of the worm wheel 52 ( The end surface 52a (in the opening direction) comes into contact with the tip of one of the adjustment bolts 56, forcibly stopping the rotation of the operation handle 54, and fully opening the valve. When the valve is fully closed from the open state, the end surface 52b of the worm wheel 52 in the rotating direction (closing direction) comes into contact with the tip of the other adjustment bolt (not shown), and the rotation of the operation handle 54 is performed. Is forcibly stopped and the valve opening is fully closed. As described above, by projecting the adjusting bolt 56 into the casing 51, the valve body can be held at a predetermined valve opening. Further, the valve opening can be adjusted by changing the projection length.

[0005]

Grease is used as a lubricating oil in a casing 51 of a gear type valve driving device. This grease has a viscosity at first and does not leak to the outside, but the viscosity decreases as it gets older, and the grease has a possibility of leaking due to a change in temperature or the like. Therefore, depending on the mounting direction of the valve driving device, the bolt through-hole 55 into which the adjusting bolt 56 is screwed may be located below the grease pool. In this case, the grease leakage from the bolt through-hole 55 is completely prevented. I couldn't. Thus, in the above-described conventional opening adjustment mechanism, the nut 58 is tightened with the washer 57 interposed between the casing 51 and the casing 51. However, with this, sufficient tightening cannot be performed, and the vibration transmitted from the worm wheel 52 causes a problem that the nut 58 is loosened, the sealing performance is not maintained, and grease leaks. Further, there has been another problem that the length of the protrusion of the adjusting bolt 56 is shortened, and the set opening of the valve is deviated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and reliably prevents grease leakage.
An object of the present invention is to provide an opening adjustment mechanism of a valve driving device that can stabilize a valve opening.

[0007]

According to the present invention, a worm gear for operating a valve shaft of a valve is provided in a casing, a bolt through hole is provided in the casing, and an adjusting bolt is provided in the bolt through hole. Screw in the bolt to project the tip into the casing, and then contact the tip of this adjusting bolt with the worm wheel end face of the worm gear,
In the opening adjustment mechanism of the valve driving device that adjusts the opening of the valve, the regulating bolt is screwed into the bolt through hole so that the tip of the adjusting bolt contacts the rear end of the adjusting bolt,
Since a gap is provided between the rear end and the front end of the regulating bolt and the sealing bolt is screwed into the bolt through hole, the adjusting bolt is not easily loosened, and the set opening is not disturbed. Further, since the vibration of the worm wheel transmitted to the adjusting bolt is not transmitted to the sealing bolt, the sealing bolt can be prevented from loosening and the sealing performance can be maintained.

[0008] Since the seal bolt is tightened by interposing a seal washer between the seal bolt and the casing, it is possible to seal in detail.
Grease does not leak down the thread.

A recess is formed at the outer end of the bolt through-hole, and a seal ring is provided on the outer periphery of the head of a sealing bolt screwed into the bolt through-hole. Then, the bolt through hole may be sealed,
In this case, it is possible to prevent the loosening by regulating the adjusting bolt only with the sealing bolt, and to reliably seal between the end of the bolt through hole and the head of the sealing bolt.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2, a worm gear formed by engaging a worm wheel 2 and a worm 3 formed in a substantially fan shape is disposed in the casing 1, and a shaft portion 3a of the worm 3 projects outside the casing 1. The operation handle 4 is fixed to an end of the protruding worm shaft 3a.
A through hole (not shown) for inserting a valve shaft end of a valve (not shown) is formed in the bottom surface of the casing 1, and a square shaft hole that fits into the valve shaft end inserted into the casing 1. 2c is provided on the worm wheel 2. Further, a scale 1 indicating the valve opening is provided on the upper surface of the casing 1.
a is provided.

When the valve is fully opened (fully closed), a bolt through hole 5 facing the end face 2a and a bolt through hole 5 facing the end face 2a are formed in the side wall 1b of the casing 1 facing the end face 2a (end face 2b) in the rotating direction of the worm wheel 2. And a bolt through-hole (not shown) opposed to the bolt hole, and a thread is formed on an inner peripheral surface of the bolt through-hole 5. The not-shown bolt through-holes are provided at symmetric positions with a line parallel to the illustrated through-hole of the bolt through-hole 5 and passing through the center of rotation of the worm wheel as a symmetric axis.

Further, the adjusting bolt 6 is inserted into the bolt through hole 5.
Into the casing 1 so as to project the tip into the casing 1 as appropriate. Next, the regulating bolt 7 is screwed in, and the tip of the regulating bolt 7 is brought into contact with the rear end of the adjusting bolt 6. Further, a gap 9 is provided between the rear end and the front end of the adjusting bolt 6, and the sealing bolt 8 is screwed with a seal washer 10 interposed between the adjusting bolt 6 and the casing 1. An adjusting bolt and a regulating bolt (not shown) are similarly screwed into bolt through holes (not shown). The adjusting bolt 6 and the regulating bolt 7 screwed into the bolt through-hole 5 are set screw-shaped bolts having a hexagonal screw hole at the rear end.

The bottom surface of the casing 1 is brought into contact with the upper surface of the valve shaft cylinder of the valve (not shown), the end of the valve shaft is inserted into the insertion shaft hole, and the valve shaft is inserted into the shaft hole 2c of the worm wheel 2. By fitting the ends, the valve driving device is attached to the valve, and the rotational movement of the operation handle 4 is transmitted to the valve shaft via the worm gear, and the valve is manually opened and closed.

The operation of the above-described opening adjustment mechanism will be described below. The projecting length of the adjusting bolt 6 and the adjusting bolt (not shown) is adjusted in advance so that the valve body is set to stop at the fully open and fully closed positions. First, when the valve is changed from the fully closed state to the fully opened state (the state shown in FIGS. 1 and 2), the operation handle 4 is turned to rotate the worm wheel 2 through the worm 3 in the opening direction. The valve element rotates in the opening direction via the combined valve shaft. Then, when the worm wheel 2 rotates 90 degrees and the valve is fully opened,
The end surface 2 a of the worm wheel 2 abuts on the tip of the adjusting bolt 6 to restrict the rotation of the worm wheel 2, and forcibly stops the rotation of the operation handle 4 via the worm 3.

When the valve is fully closed from the fully opened state (the state shown in FIGS. 1 and 2), the operation handle 4 is turned in the opposite direction, and the worm wheel 2 is turned through the worm 3 in the closing direction. When it is moved, the valve element rotates in the closing direction via the valve shaft fitted to the worm wheel 2. When the worm wheel 2 rotates 90 degrees and the valve is fully closed, the end surface 2b of the worm wheel 2 comes into contact with the tip of the other adjusting bolt (not shown) to rotate the worm wheel 2. The movement is restricted, and the rotation of the operation handle 4 via the worm 3 is forcibly stopped. In addition, each adjustment bolt 6
By changing the protruding length of the worm wheel, the opening degree of the valve can be finely adjusted, and the rotation angle of the worm wheel 2 can be set in advance so that the valve body stops at an appropriate opening position. it can.

The valve body can be held at an appropriate valve opening by projecting the adjusting bolt 6 into the casing 1, and the valve opening can be finely adjusted by changing the projecting length. is there. Furthermore, the regulating bolt 7
Are screwed into the bolt through holes 5 by contacting the rear ends of the adjusting bolts 6, so that the adjusting bolts 6 are not easily loosened, and the set opening is not disturbed. Further, since a gap 9 is provided on the rear end side of the regulating bolt 7 and the sealing bolt 8 is screwed thereto, the worm wheel 2 transmitted to the adjusting bolt 6 is formed.
To prevent the vibrations from being transmitted to the sealing bolt 8,
The loosening of the sealing bolt 8 can be prevented, and the sealing performance can be maintained. And, since the sealing bolt 8 is tightened with the seal washer 10 interposed between the casing 1 and the casing 1, it is possible to seal the details in detail, and the grease does not leak along the screw thread.

Next, another embodiment of the present invention will be described with reference to FIGS. A worm gear formed by engaging a worm wheel 32 and a worm 33 formed in a substantially fan shape is disposed in the casing 31, and further, a shaft portion 33 a of the worm 33 is formed so as to protrude outside the casing 31, and An operation handle 34 is fixed to an end of the protruding worm shaft 33a. Also,
An insertion shaft hole (not shown) for inserting a valve shaft end of a valve (not shown) is formed on the bottom surface of the casing 31, and a square shaft hole 32c that fits into the valve shaft end inserted into the casing 31 is formed. , The worm wheel 32. As in the above-described embodiment, a scale indicating the valve opening may be provided on the upper surface of the casing 31.

When the valve is fully opened (fully closed), the end surface 32a (end surface 32b) of the worm wheel 32 in the rotating direction.
An end face 32a is provided on a side wall 31b of the casing 31 facing the end face 32a.
And a bolt through hole (not shown) facing the end surface 32b, and a thread is formed on the inner peripheral surface of the bolt through hole 35. Further, the outer end of the bolt through hole 35 is enlarged in diameter to form a short cylindrical recess 35 a concentric with the bolt through hole 35. The not-shown bolt through-hole is provided at a symmetrical position with a line parallel to the illustrated through-hole of the bolt through-hole 35 and passing through the rotation center of the worm wheel 32 as a symmetric axis.

Then, an adjusting bolt 36 is screwed into the bolt through hole 35, and the tip is protruded into the casing 31 as appropriate. Next, an annular groove 38b is formed on the outer peripheral surface of the head 38a, and a sealing bolt 38 in which a seal ring 40 made of an elastic member is fixed in the annular groove 38b, and the tip of the sealing bolt 38 abuts on the rear end of the adjusting bolt 36. Bolt through hole 35
Into the recess 35a with a gap 39 between the head 38a and the recess 35a.
A bolt through hole 38 is formed between the inner peripheral surface and the outer peripheral surface of the seal ring 40.
Seal. Here, a bolt through hole (not shown)
Similarly, an adjusting bolt and a sealing bolt (not shown) are screwed therein. In the same manner as in the above-described example, a regulating bolt is brought into contact with the rear end of the adjusting bolt 36, and a gap is provided between the regulating bolt 36 and the rear end of the regulating bolt. You may.

Hereinafter, only the operation different from that of the above embodiment will be described. Since the seal ring 40 was provided on the outer periphery of the head 38a of the sealing bolt 38 and this head 38a was fitted into the recess 35a formed at the end of the bolt through hole 35,
The bolt through hole 35 can be sealed, and the sealing bolt 38 can be prevented from loosening. Thus, only the sealing bolt 38 formed in this way can regulate the adjusting bolt 36 to prevent loosening and to reliably seal. Also, the head 38a
A gap 39 is provided between the first and second concave portions 35a, and the head portion 38a is embedded in the concave portion 35a, so that the valve opening can be finely adjusted, and the sealing bolt 38 is provided outside the casing 31. The head 38a does not protrude, so that the safety of the worker can be improved.

Although the above-described valve driving device uses a worm gear, the present invention is not limited to this, and can be applied to a valve driving device using a bevel gear or the like.

[0022]

According to the present invention described in detail above, since the adjusting bolt to be brought into contact with the end surface of the worm wheel can be prevented from loosening, the opening of the valve is stabilized. Since the regulating bolt is arranged between the sealing bolt and the adjusting bolt, the sealing bolt is securely prevented from leaking without the loosening of the sealing bolt. Furthermore, since the seal washer is interposed, the seal is tightly sealed and does not leak to the outside through the thread of the sealing bolt or the like.

A sealing ring is provided on the outer periphery of the head of the sealing bolt, and the sealing ring and the recess at the end of the bolt through-hole are tightly sealed to prevent leakage of grease and loosen the adjusting bolt. Therefore, the valve opening can be maintained at the set opening, and the valve opening can be easily adjusted as in the related art. In addition, the head of the sealing bolt does not protrude outside the casing, so that safety during transportation and operation can be enhanced.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross section showing an example of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the whole of the above example.

FIG. 3 is a partially enlarged cross section showing another example of the embodiment of the present invention.

FIG. 4 is a schematic diagram showing the whole of the above example.

FIG. 5 is a partially enlarged cross section showing a conventional example.

FIG. 6 is a schematic view showing the whole of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 31 Casing 2, 32 Worm wheel 3, 33 Worm 4, 34 Operation handle 5, 35 Bolt through hole 35a Depression 6, 36 Adjustment bolt 7 Regulatory bolt 8, 38 Sealing bolt 9 Gap part 10 Seal washer 40 Seal ring

Claims (3)

(57) [Claims] 1. A worm gear for operating a valve shaft of a valve is provided in a casing, a bolt through hole is provided in the casing, and an adjusting bolt is screwed into the bolt through hole to project a tip end into the casing. Contact the tip of the adjustment bolt with the worm wheel end face of the worm gear,
In the opening adjustment mechanism of the valve drive device for adjusting the opening of the valve, a regulating bolt screwed into the bolt through hole is tightened to abut on a rear end of the adjusting bolt, and further, a regulating bolt rear end is provided. And a gap between the tip and
An opening adjusting mechanism for a valve driving device, wherein a sealing bolt is screwed into a bolt through hole. 2. The valve opening adjusting mechanism according to claim 1, wherein a seal washer is interposed between the sealing bolt and the casing. 3. A worm gear for operating a valve shaft of a valve is provided in a casing, a bolt through hole is provided in the casing, and an adjusting bolt is screwed into the bolt through hole to project a tip end into the casing. Contact the tip of the adjustment bolt with the worm wheel end face of the worm gear,
In an opening adjusting mechanism of a valve driving device for adjusting an opening of a valve, a concave portion is formed at an outer end of the bolt through hole, and a seal is formed around a head outer periphery of a sealing bolt screwed into the bolt through hole. An opening adjustment mechanism for a valve driving device, wherein a ring is provided, and a bolt through hole is sealed by the seal ring and the inner peripheral surface of the concave portion.