JPH0229323Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a butterfly valve installed in a large diameter pipe for feeding fluid, and a sub valve inserted into the main valve shaft. The present invention relates to a sub-valve structure in a butterfly valve with a built-in sub-valve in which the shaft can be opened and closed independently of the main valve shaft.

[Prior art]

A typical example of a conventional butterfly valve with a built-in auxiliary valve is the Utility Model 48-1 shown in Figure 6.
There is one shown in Publication No. 25237. This conventional technology is equipped with a main valve body 01 and a sub-valve body 02, and when the handle 07 is rotated, each gear rotates, and the gear 06 is rotated.
When the sub-valve shaft 05 rotates, the sub-valve shaft 05 keyed thereto rotates, and the sub-valve body 02 keyed 03 to the sub-valve shaft 05 opens. Further, when the large handle is rotated, the large segment gear 09 meshing with the large worm gear 010 rotates, and in conjunction with the rotation, the main valve shaft 04 and the main valve body 01 open.

In the case of this conventional butterfly valve, when attaching the sub-valve body 02, the sub-valve stem 05 is inserted from above into the main valve stem 04, the main valve body 01, and the sub-valve body 02, and the key 03 is The auxiliary valve body 02 and the auxiliary valve shaft 05 were fixed by being hammered from inside the pipe. Therefore, installing and fixing the sub-valve body was not only complicated but also caused errors in the mounting position.Moreover, recently, only the tip of the sub-valve shaft is square and is inserted and fixed into the square hole of the sub-valve body. However, it was difficult to achieve accuracy and could cause wobbling.

[Problem that the invention attempts to solve]

With this invention, the auxiliary valve shaft, which is pre-fixed to a high-precision internal gear, is inserted into the main valve shaft, main valve body, and auxiliary valve from above, and the auxiliary valve can be adjusted to the auxiliary valve shaft with high precision and with one touch. The purpose is to make it possible to install and fix the

[Means to solve the problem]

However, the present invention has solved the technical problem by adopting the following configuration. That is, the auxiliary valve shaft 2 is spline-coupled 3 so that it can move forward and backward with respect to the mounting hole 10 of the auxiliary valve B, and the position fixing screw 4 is connected to the mounting hole 10 of the auxiliary valve B.
The sub-valve shaft 2 extends from the surface to the spline joint 3 and is fixedly connected to the sub-valve B.

[Effect]

Since the above configuration is adopted, after completing the installation of the main valve A and the main valve drive section, insert the sub-valve shaft 2 hanging down from the sub-valve drive section incorporating the internal gear from the upper part of the main valve A, It passes through the main valve shaft 1 and the inside of the main valve A, and is spline-coupled to the installed sub-valve B.

After that, by adjusting the height of the sub-valve B vertically with respect to the sub-valve shaft 2 and tightening the position fixing screw 4 from the surface of the sub-valve B, the fixed connection between the sub-valve B and the sub-valve shaft 2 is established. Accurately and easily completed.

〔Example〕

A preferred embodiment will now be described in detail with reference to FIGS. 1-5.

A support case 13 is fixedly installed above the bearing part 12 of the housing 8, and a segment gear 14 in the support case 13 is fitted and fixed to the upper part of the main valve shaft 1. A worm gear 15 that is horizontal and perpendicular to the valve shaft 1 is provided, and a main valve operating shaft that meshes with the segment gear 14 and rotates the worm gear 15 via a bevel gear is installed.

The upper end surface of the segment gear 14 exposed on the upper surface side of the support case 13 has a two-split gear case 1.
A fixed internal gear 17 is formed on the upper inner circumference of the gear case 16, and the gear case 16 below the gear 17 is fixed.
Inside is the same diameter as the gear 17 and the number of teeth is 1 or 2.
Drive internal gears 18 that are different in size are fitted, and the central lower part of the gears 18 is fitted to the upper end of the sub-valve shaft 2 and fixed via the key 6. gear case 1
6, an internal pinion 19 straddles and meshes with both the gears 17 and 18, and above the center of the gear case 16 is installed an auxiliary valve operating shaft 20 that can be rotated.

The auxiliary valve shaft 2 passes through the center hole 11 of the main valve shaft 1 and the center hole 11' provided in the main valve A, extends to the small valve hole 7, and further, as shown in FIG. The auxiliary valve B and the auxiliary valve shaft 2 are fixedly connected by tightening a position fixing screw 4 that passes through the center hole 10 of the valve B and extends from the surface of the auxiliary valve B into the threaded hole 11. As shown in FIGS. 3 to 5, the sub-valve B and the sub-valve shaft 2 consist of a spline joint 3 and a flexible joint 3', and the sub-valve B
can be moved up and down by a fixed interval while fitted into the sub-valve shaft 2. In particular, the spline shown in FIG. 4 is just one example, and accuracy can be improved by increasing the number of notch teeth.

Therefore, when assembling the butterfly valve with built-in auxiliary valve of the present invention, after assembling the main valve A and the support case 13 which is the driving part of the main valve, the internal gear which is the driving part of the auxiliary valve is assembled. The sub-valve shaft 2 hanging down from the built-in gear case 16 is inserted into the center hole 11 of the main valve shaft 1 and the center hole 11 of the main valve A from above the valve body. When the sub-valve shaft 2 is inserted into the center hole 10 of the sub-valve B installed in the small valve hole 7 and the spline connection 3 is completed, the seal portion 5 of the sub-valve B and the valve seat 9 are properly sealed. Adjust sub-valve B by raising and lowering it until it hits the right spot. After adjustment, the position fixing screw 4 is tightened with a screwdriver or the like, and the tip of the position fixing screw 4 is brought into strong contact with the spline joint 3, thereby completing the installation of the sub-valve.

〔effect〕

Therefore, in the present invention, the sub-valve shaft 2 is spline-coupled to the mounting hole 10 of the sub-valve B so that it can move forward and backward, and the position fixing screw 4 is extended from the surface of the sub-valve B to the spline coupling portion 3. By fixedly connecting the sub-valve shaft 2 to the sub-valve B, after completing the installation of the main valve A and the main valve drive section, the sub-valve shaft 2 hanging down from the sub-valve drive section incorporating the internal gear,
It is inserted from the upper part of the main valve A, passes through the main valve shaft 1, and is spline-coupled to the installed sub-valve B.
After that, by adjusting the height of the sub-valve B vertically with respect to the sub-valve shaft 2 and tightening the position fixing screw 4 from the surface of the sub-valve B, the fixed connection between the sub-valve B and the sub-valve shaft 2 is established. , can be easily completed with high precision and little wobbling. Further, in order to remove dust or the like that gets caught in the seal portion of the sub-valve B, the work can be easily done by simply loosening the position fixing screw 4.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view of the butterfly valve structure, Fig. 2 is an enlarged sectional view of the sub-valve part, Fig. 3 is a front view of Fig. 2, and Fig. 4 is: Figure 3 -
5 shows a sectional view taken along the - line of FIG. 3, and FIG. 6 shows a sectional view of a prior art valve. A...Main valve, B...Sub-valve, 1...Main valve shaft, 2...
...Sub-valve shaft, 3...Spline joint, 4...Position fixing screw.

Claims (1)

[Scope of utility model registration request] A sub valve is fitted in the center of the main valve, and both main and sub valves are pivoted to the main valve shaft and the sub valve shaft on the same axis so that each valve can be rotated to open and close. In the butterfly valve with a built-in valve, the sub-valve shaft is spline-coupled to the mounting hole of the sub-valve so as to be movable forward and backward, and a position fixing screw is extended from the surface of the sub-valve to the spline joint portion to connect the sub-valve. A sub-valve structure in a butterfly valve with a built-in sub-valve, characterized in that a shaft is fixedly connected to the sub-valve.