JPH09196228A - Method for connecting valve shaft and actuator driving shaft with each other - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform alignment for center axes only by inserting a valve shaft and an actuator driving shaft into a cylindrical body fixed to the tip part of a valve box from opposing directions so as to enable even unskilled wofkers to perform assembling work for joining the valve shaft and the actuator driving shaft together within a short time and to facilitate disassembling work for maintenance. SOLUTION: In the tip part of a valve box 1, a cylindrical body 7 using its inner circumference as a sliding surface is fixed by aligning its center line with those of a valve shaft 3 and an actuator driving shaft 5 and engaging parts are formed in the tip parts of the valve shaft 3 and the actuator driving shaft 5. Further, the tip parts of the valve shaft 3 and the actuator driving shaft 5 are inserted from the opposing directions of the cylindrical body 7 and engaged with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a valve shaft and an actuator drive shaft in an actuator for operating a valve element installed in various pipes.

[0002]

2. Description of the Related Art Conventionally, assembling work for connecting a valve shaft 3 and an actuator drive shaft 5 in an actuator 4 for operating a valve box 1 installed in various pipes, as shown in FIG. Bracket 10 between
And the coupling between the valve shaft 3 and the actuator drive shaft 5 with a coupling member 15 or the formation of an engaging portion and a locking portion at the distal end of the valve shaft 3 and the actuator drive shaft 5, This has been done by directly connecting the valve shaft 3 and the actuator drive shaft 5 without using the material 15.

[0003]

In any case, a center axis aligning operation for aligning the center points of the valve shaft and the actuator drive shaft is required, but in the above-mentioned conventional connecting method, a bracket is required to perform this operation. 10 is lightly fixed between the tip of the valve element 1 and the tip of the actuator 2 with bolts 16 so that it can be adjusted. Then, the center axes of the valve shaft 3 and the actuator drive shaft 5 are aligned. Is fixed to the valve box 1 and the actuator 4 by bolts 16.

[0004] However, this operation is complicated, requires a long time, and has a drawback that it requires skill.

[0005] In addition, in order to match the drive of the actuator and the degree of opening and closing of the valve, in addition to the above-described center axis alignment,
Since it is necessary to adjust the angle between the valve shaft and the actuator drive shaft, the complexity of the work increases and further skill is required.

In addition, the conventional joining method requires a bracket and a coupling material. However, there is a problem in that the purchase and production of these require a large amount of cost.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention provides a cylindrical body having an inner periphery as a sliding surface at the center of a valve shaft and an actuator drive shaft. And an engaging portion is formed at one end of the valve shaft and the actuator drive shaft, and the distal end of the valve shaft and the actuator drive shaft is inserted from the opposite direction of the cylindrical body to thereby engage the engaging portion. The present invention proposes a method of coupling a valve shaft and an actuator drive shaft, which are adapted to engage with each other.

In other words, according to the present invention, the valve shaft and the actuator drive shaft are arranged in opposite directions from each other in a cylinder fixed to the valve box or the distal end of the actuator so that the center line thereof is fixed to the center line of the valve shaft and the actuator drive shaft. The center axis alignment work is completed only by inserting.

Therefore, according to the present invention, an assembling operation for connecting the valve shaft and the actuator drive shaft can be performed easily and in a short time even by a non-expert technician.
Also, disassembly work for maintenance can be easily performed.

Further, in the present invention, since the cylindrical body is fixed to the valve box or the tip of the actuator, and the bracket is not required unlike the prior art, the assembling or disassembling operation can be easily performed, and the purchase of the bracket is not only possible. Alternatively, the production cost is unnecessary, and the economic effect is great.

It is needless to say that a cylindrical body may be fixed by providing a bracket on the valve box or the distal end of the actuator as in the prior art.

Further, if the engagement portion formed at the distal end portion of the valve shaft and the actuator drive shaft is engaged at only one position in the rotation direction of the valve shaft or the actuator drive shaft, the actuator can be used. It is also possible to easily adjust the angle between the valve shaft and the actuator drive shaft for adjusting the driving of the valve and the degree of opening and closing of the valve.

On the other hand, the cylindrical body used in the present invention is formed of a wear-resistant resin such as fluororesin so that the valve shaft and the actuator drive shaft slide on the inner peripheral surface.

When connecting a valve shaft and an actuator drive shaft having different diameters to each other, the center axis can be inevitably determined by using a sliding cylinder adapted to the outer diameter of each shaft.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiment. FIG. 1 shows an example of the connection between a valve shaft and an actuator drive shaft in a butterfly valve. Reference numeral 3 denotes a valve shaft, 4 denotes an actuator, and 5 denotes an actuator drive shaft.

At the tip of the valve box 1, a cylindrical mounting hole 6 is provided.
Then, a cylindrical body 7 made of fluororesin having an inner peripheral surface as a sliding surface is fitted into and fixed to the mounting hole 6.

The valve shaft 3 and the actuator drive shaft 5 are formed at their distal ends with engaging portions 8 and 9 which engage with each other.

The distal ends of the valve shaft 3 and the actuator drive shaft 5 as described above are inserted from opposite directions of the cylindrical body 7 so that the engaging portions 8 and 9 are engaged to perform center axis alignment.

In this embodiment, the cylindrical body 7 is fixed to the mounting hole 6 so that the center line of the cylindrical body 7 coincides with the center line of the valve shaft 3 and the actuator drive shaft 5. The center axis can be easily adjusted simply by inserting the distal end portion into the cylindrical body 7 and engaging the engaging portions 8 and 9.

The engagement portions 8 and 9 are engaged only at one position in the rotation direction of the valve shaft or the actuator drive shaft in order to match the drive of the actuator 4 and the opening / closing degree of the valve 2. In this embodiment, engagement surfaces 8 and 9 are inclined surfaces inclined at opposite directions at a predetermined angle.

Therefore, the angle between the valve shaft 3 and the actuator drive shaft 5 can be easily adjusted only by engaging the engaging portions 8 and 9.

There are various examples of the engaging portions 8 and 9 which have a relationship of engaging the engaging portions 8 and 9 only at one position in the rotational direction of the valve shaft or the actuator drive shaft.

In FIG. 3, the valve shaft 3 and the actuator drive shaft 5
FIG. 4 shows an example in which engaging portions 8 and 9 are formed at step portions which are engaged with each other at a predetermined position in the rotation direction of the valve body. This shows a state where the distal end portion of the actuator drive shaft 5 is inserted and engaged.

FIG. 5 shows an improved example of FIGS. 1 and 2 in which a projection 8a and a corresponding depression 9a are formed on an inclined surface which is inclined at a predetermined angle in a direction opposite to each other, and engagement portions 8 and 9 are formed. Is in good engagement.

In the above embodiment, an example in which the cylindrical body 7 is fixed to the valve box 1 to the tip of the actuator 4 without using the bracket is shown, but of course the bracket is provided between the valve box 1 and the tip of the actuator 4. The cylindrical body may be fixed in this bracket by interposing.

FIG. 6 shows this embodiment. A bolt hole 12 for attaching to the actuator 4 is formed in a flange 11 at one end of a bracket 10 interposed between the valve box 1 and the distal end of the actuator 4. The other end of the flange 13 is formed with a bolt hole 14 for attachment to the valve box 1,
A cylindrical body 7 is fitted and fixed in 10, and the valve shaft 3 having the engaging portions 8 and 9 shown in FIG. 5 and the actuator drive shaft 5 are inserted into the cylindrical body 7.

FIG. 7 shows an example of the engaging portions 8 and 9 in the case where the outer diameters of the valve shaft 3 and the actuator drive shaft 5 are different. A projection 8a is formed on the inclined surface, and a depression 9a corresponding to the projection 8a is formed on the inclined surface at the distal end of the valve shaft 3 having a large outer diameter in accordance with the center line of the valve shaft 3 and the actuator drive shaft 5. .

FIG. 8 shows an example in which the valve shaft 3 having a different outer diameter and the actuator drive shaft 5 are aligned with the center axis as described above. In this case, the cylindrical body 7 fixed to the distal end of the valve box 1 is used. If the inner peripheral surface is made to have a diameter corresponding to the outer diameter on the insertion side of the valve shaft 3 and the insertion side of the actuator drive shaft 5, respectively, and the distal ends of the valve shaft 3 and the actuator drive shaft 5 are inserted, The center axes of the valve shaft 3 and the actuator drive shaft 5 can be easily aligned.

[0029]

In summary, according to the present invention, the valve shaft and the actuator drive shaft are mutually fixed in a cylinder fixed to the valve box or the distal end of the actuator so that its center line is aligned with the center line of the valve shaft and the actuator drive shaft. The center axis can be aligned simply by inserting it from the opposite direction. Therefore, even a non-skilled technician can easily and quickly assemble the valve shaft and the actuator drive shaft. The disassembly work can be easily performed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the above.

FIG. 3 is a diagram showing another example of the engagement portion between the valve shaft and the actuator drive shaft.

FIG. 4 is a diagram showing a coupling state between the valve shaft and the actuator drive shaft according to the first embodiment;

FIG. 5 is a diagram showing still another example of the engaging portion between the valve shaft and the actuator drive shaft.

FIG. 6 is a diagram showing a coupling state between a valve shaft and an actuator drive shaft using a bracket.

FIG. 7 is a diagram showing an example of an engaging portion between a valve shaft having a different outer diameter and an actuator drive shaft.

FIG. 8 is a diagram showing a coupling state between the valve shaft and the actuator drive shaft according to the first embodiment;

FIG. 9 is an exploded perspective view showing a conventional connection between a valve shaft and an actuator drive shaft.

[Explanation of symbols]

 1 is a valve box 2 is a valve 3 is a valve shaft 4 is an actuator 5 is an actuator drive shaft 6 is a mounting hole 7 is a cylindrical body 8, 9 is an engagement portion 8 a is a projection 9 a is a depression 10 is a bracket 11, 13 is a flange 12, 14 is a bolt hole 15 is a coupling material 16 is a bolt

Claims (4)

[Claims] A cylindrical body having an inner periphery as a sliding surface is fixed to a valve box or an end of an actuator so that its center line is aligned with the center line of a valve shaft and an actuator drive shaft. The valve is characterized in that an engaging portion is formed at the distal end of the valve, and the distal end of the valve shaft and the actuator drive shaft are inserted from the opposite direction of the cylindrical body to engage the engaging portion. How to connect shaft and actuator drive shaft. 2. The method according to claim 1, wherein the engagement portion formed at the distal end of the valve shaft and the actuator drive shaft engages only at one position in the rotation direction of the valve shaft or the actuator drive shaft. 3. The method according to claim 1, wherein a cylinder formed of a wear-resistant resin is used. 4. The method according to claim 1, wherein a bracket is provided on the valve box or the tip of the actuator to fix the cylindrical body.