JP2568204Y2 - Fixing device for 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 a fixing device for a valve driving portion of a rotary valve such as a butterfly valve.

[0002]

2. Description of the Related Art An example of a conventional rotary valve driving device for a rotary valve will be described with reference to a manual driving device using a planetary gear shown in FIG. A planetary gear 3 composed of a large diameter portion 3a and a small diameter portion 3b is rotatably supported and provided. The planetary gear 3 is formed on the inner surface of the stationary body 4 and the inner surface of the large diameter portion 5a of the output shaft 5, respectively. External gears 3a, 3 meshing with both internal gears 4a, 5b
b is formed on the large diameter portion and the small diameter portion, respectively.
During operation, the rotation of the eccentric shaft 2 driven by the handle 1 causes the planetary gear 3 to move the inner surface of the stationary body 4 and the output shaft 5
While rotating along the internal gears 4a and 5b on the inner surface while revolving, the output shaft 5 is rotated at a reduced speed in accordance with the ratio (difference) between the meshing teeth of the two systems.

In the drawing, reference numeral 6 denotes an upper cover of the main body 4, and 7 denotes a driving portion mounting flange on the valve main body side, which is fixed to the main body 4 by bolts 8. 9 is an indicator mounted on the top of the output shaft 5 and 10 is a keyway 5d at the bottom of the output shaft 5.
1A is the central axis of the handle 1 and coincides with the central axis of the output shaft 5. Also, 2A
Is the central axis of the outer diameter of the lower eccentric part 2 a of the eccentric shaft 2, that is, the central axis of the inner diameter of the planetary gear 3.

[0004]

[Problems to be solved by the invention] As described above,
The drive unit body 4 and a valve body (not shown) are fixed by a plurality of bolts 8 via a drive unit mounting flange 7,
The drive unit is prevented from coming off and from rotating. And in the case of a butterfly valve,
The drive unit is fixed by four, eight or twelve bolts, as determined by the ISO (International Organization for Standardization) standards. This is the shape and size calculated from the bolt tightening force and the torque, but most of the force is provided to suppress this torque.

In this case, when the bolt 8 is not tight enough, or when an excessive torque (torque) acts on the output shaft 5,
When the rotation is repeated by the gap between the hole of the drive unit mounting flange 7 and the bolt 8 and this is repeated, in the worst case, the bolt 8
However, there is a problem that the drive part is loosened and the drive part is lost. In addition, since the rotation is stopped by the tightening force of the bolt 8, it is necessary to tighten the bolt with a stronger force.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and prevents a conventional mounting bolt for mounting a drive unit body and a valve body from coming off without applying the torque (torque) of the valve drive unit. It is an object of the present invention to provide a fixing device for a valve drive unit that supports only a role.

[0007]

In order to achieve the above object, the present invention provides a fixing device in which a valve driving unit is mounted on a valve body via a driving unit mounting flange. A skirt portion having a shape adapted to the shape of the driving portion mounting flange of the valve body was provided on the peripheral portion of the end face, and the skirt portion was fitted into the driving portion mounting flange to fix the rotation of the valve driving portion main body. It is characterized by:

[0008]

Since the present invention is constructed as described above, during operation, when a handle or the like is rotated to rotate the valve body and a reduced output is generated on the output shaft, a planetary gear mechanism is used as the reduction means. When torque is used, torque acts on the internal gear fixed to the drive unit body side, and torque acts to rotate the drive unit body with respect to the valve body.

However, since the valve driving section main body is fitted and fixed to the driving section mounting flange on the valve main body side via a skirt portion provided on the lower end surface thereof, the torque is reduced by the mounting bolt. , And the mounting bolt exclusively serves to prevent the drive unit main body from coming off.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention.

In FIG. 1, an upper portion of a valve driving section main body 11 is sealed by an upper lid 12 and an indicator 13, and an indicator 13 is fixed to an upper end of an output shaft (not shown) extending through the upper lid 12. On the other hand, a plurality of skirts 14 are provided at intervals on the peripheral edge of the lower end surface of the valve drive unit main body 11, and the skirts 14 are
The skirt portion 1 is formed to have an inner shape that matches the outer shape of the drive portion mounting flange 15 of the valve body.
4 is fitted into the drive unit mounting flange 15 to fix the rotation. Therefore, skirt part 1
As means for preventing rotation, the means 4 and the drive unit mounting flange 15 may be formed by using a non-cylindrical surface for both fitting surfaces or providing an engaging portion for preventing rotation on both fitting surfaces. ing. In the drawing, reference numeral 16 denotes a retaining bolt for attaching the lower end surface of the driving section main body 11 to the driving section mounting flange 15, which is fixed by a nut 17. Reference numeral 18 denotes a hand grip, which is integrated with the upper lid 12. Therefore, the upper lid 12
Also has the role of a steering wheel. An indicator 13 is provided to prevent the upper lid 12 from coming off.

With the above-mentioned structure, a planetary gear mechanism is used as a speed reducing means when the steering wheel 18 is rotated to rotate the valve body to generate a reduced output on the output shaft during operation. At this time, torque acts on the internal gear fixed to the drive section main body 11 side, and torque acts to rotate the drive section main body 11 with respect to the valve body.

However, the valve driving unit main body 11 is
Since the rotation is fixed to the drive unit mounting flange 15 on the valve body side via the skirt portion 14 provided on the peripheral edge of the lower end surface, the torque is almost completely applied to the mounting bolt 16. The mounting bolt 16
Performs the function of preventing the drive unit main body 11 from coming off exclusively.

According to this embodiment, since the rotational force acting on the drive unit main body 11 is suppressed by the plurality of skirts 14, the mounting bolts 16 need only be provided for retaining the bolts. If the bolt size M8 (JIS,
The role of the drive unit mounting flange 15 which is mounted by a metric system screw symbol displayed in a standard such as ISO) corresponds to F07 of ISO 5211. In this case,
The maximum weight of the driving unit is about 50 kgf.
Since the breaking strength of No. 8 exceeds at least 1 t with one wire, it is considered that one piece of fixing for preventing the drive unit from falling off is sufficient. However, it is preferable to fix with two diagonal bolts 16 from the viewpoint of balance.

In the present invention, the skirt portion 14 provided on the lower end surface of the driving portion main body 11 is provided with the driving portion mounting flange 1.
As long as the rotation is fixed to 5, it is not necessary to divide it into a plurality of parts, and it may be a whole circumference.

[0016]

As described above, according to the present invention, according to the present invention, in a fixing device in which a valve driving unit is mounted on a valve body via a driving unit mounting flange, a peripheral portion of a lower end surface of the valve driving unit main body is provided. By providing a skirt portion having a shape adapted to the shape of the driving portion mounting flange of the valve body, and fitting the skirt portion to the driving portion mounting flange to fix the rotation of the valve driving portion main body, during operation. Since the torque of the valve drive unit main body acting upon rotation of the valve body is suppressed by the skirt provided on the lower end surface of the drive unit main body, the mounting bolt for mounting the drive unit main body to the drive unit mounting flange is used. Functions merely as a stopper, so that various troubles caused by excessive torque acting on the mounting bolt can be effectively eliminated.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Valve drive part main body 12 Top cover and handle 13 Indicator and handle holder 14 Skirt part 15 Drive part mounting flange 16 Mounting bolt 17 Nut 18 Handle grip

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixing device in which a valve driving part is mounted on a valve body via a driving part mounting flange, wherein a peripheral portion of a lower end face of the valve driving part main body is adapted to a shape of a driving part mounting flange of the valve main body. A skirt portion having a predetermined shape, and the skirt portion is fitted into the driving portion mounting flange to fix rotation of the valve driving portion main body.