JPS5814588B2 - Mounting structure of band-shaped sheet member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a band-shaped sheet member configured in, for example, a butterfly valve, and more particularly to a structure in which an elastic band-shaped sheet member is pressed and fixed against a valve box by an arc-shaped pressing member. .

The valve stem of a butterfly valve is rotatably attached to the valve box at both ends via a bearing (push) or the like.

The band-shaped sheet member has, at its longitudinal end (corresponding to the circumferential direction of the valve box when attached to the valve box),
It must be in contact with the bearing, an elastic annular sealing material that is fitted externally to the bearing, or directly externally fitted to the valve shaft inside the bearing.

In other words, unless the band-shaped sheet member and the bearing, or the annular sealing material fitted externally to the bearing or valve shaft, form a series of seats (valve seats) for the valve body over the entire circumferential length, leakage will occur when the valve is closed. This is because it occurs.

Conventionally, as this kind of thing, for example,
A structure as disclosed in Japanese Patent No. 20 is known.

It consists of two bearings 1 as shown in Figures 7 and 8.
4, 14, a total of two belt-shaped sheet members 15, 15, one each for one half and the other half, are fitted in the circumferential groove 17 on the inner surface of the valve body 16, and each of the belt-shaped The sheet member 15.15 has an arcuate pressing member 18 of approximately the same length as the sheet member 15.15,
18 is pressed and fixed to the valve box 16.

Each arcuate pressing member 18, 18 serves as a means for pressing and fixing the pressing member.
Accordingly, a plurality of bolts 19 are used, each extending along the radial direction of the valve body 16.

20 is a valve stem, and 21 is a valve body.

Since the end of the band-shaped sheet member 15 near the bearing 14 is particularly susceptible to movement, a tightening bolt 19 is always disposed near this end.

When tightening this bolt 19, the band-shaped sheet member 15 receives stress in the direction away from the bearing 14 in the circumferential direction of the valve box 16, which reduces the sealing performance between the band-shaped sheet member 15 and the bearing 14. There is.

That is, the arc-shaped pressing member 1 against the belt-shaped sheet member 15
8 is a rigid body, and since this is moved radially outward of the valve body 16 and tightened, at that time, the belt-shaped sheet member 1
5 is moved to a position far from the valve center without changing its length, so the end of the belt-shaped sheet member 15 separates from the circumferential surface of the annular seal fitted onto the valve stem, resulting in poor sealing performance. be.

A technical problem to be solved by the present invention is to prevent the end of the band-shaped sheet member from separating from the side surface of the valve shaft when the pressing member is tightened, and to ensure sealing performance.

Technical means taken by the present invention to solve the above technical problems are as follows.

Among the plurality of pressing members that press and fix the elastic band-shaped sheet member to the valve box, the pressing member corresponding to the end of the band-shaped sheet member and the pressing member adjacent thereto are inclined with respect to the radial direction of the valve box. The slopes are in contact with each other on the far side in the radial direction and slopes that slope toward or away from the valve shaft, and a bolt mounting hole for the pressing member on the end side is formed in a blank hole, Further, the pressing member on this end side is provided with an engaging portion that engages with the band-shaped sheet member in its length direction.

Next, to describe the operation, when the band-shaped sheet member is pressed against the valve box by the end-side pressing member, the engaging portion of the end-side pressing member is pressed against the band-shaped sheet member in the circumferential direction of the valve box. engages in a state that restricts relative movement.

Furthermore, by causing a slip between the slopes where the end-side pressing member and the adjacent pressing member are in contact with each other, the end-side pressing member is moved in a direction away from these adjacent pressing members. use

During this movement, the end-side pressing member pulls and moves the band-shaped sheet member engaged as described above together in the same direction.

In other words, the belt-shaped sheet member is not only prevented from being compressed as in the past, but is also actively stretched.

Therefore, the end of this band-shaped sheet member is strongly pressed against the adjacent bearing or the annular sealing material fitted externally to the bearing or valve shaft, so the sealing performance between them is poor. It becomes certain.

Moreover, in addition to the original pressing and fixing action of the end-side pressing member against the belt-shaped sheet member, the force of pressing the belt-shaped sheet member toward the valve shaft side is accumulated as internal stress in this belt-shaped sheet member, and the end surface of the sheet member is Even when worn, the seat member continues to be elastically pressed against the valve stem.

The unique effect of the present invention is that it is possible to maintain good sealing performance over a long period of time regardless of wear, even though it has an extremely simple structure using mounting fasteners.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

A valve box 1 having a flange for connecting a fluid transport pipe is provided with bearings 2 and 3 around an axis perpendicular to the center of the valve box, and removable shaft support members 4 and 5 are attached to each of the bearings 2 and 3. A valve shaft 7 for attaching the valve body 6 is rotatably installed on the shaft support members 4 and 5, and a valve body opening/closing mechanism 8 is attached to the end of the valve shaft protruding from one of the shaft support members 4. At the same time, a seal structure 9 for maintaining a seal in the closed state of the valve body 6 is provided to constitute a butterfly valve.

The seal structure 9 connects the inner peripheral surfaces of the bearings 2 and 3 and the shaft supporting member 4.
, 5 and the shaft support member side end surface of the valve body 6, the annular sealing material 10 is fitted onto the valve shaft 7 and elastically displaced into an annular space surrounding the valve shaft 7. 1
0, and when the valve body 6 is in the closed state, an elastic band-shaped sheet member 11.1 that is in close contact with the circumference of the valve body and whose end surface is in contact with the annular sealing material 10.10.
1 is fitted into a groove 12.12 formed on the inner circumferential surface of the valve box 1, and the elastic band-shaped sheet member 11.11 is pressed by a plurality of pressing members 13, which are attached to the valve box 1 by bolts a... is attached to form a separate seal structure 9.

The band-shaped sheet member 11 has a convex cross-section with a narrow valve body contacting surface, and a groove 12 for inserting the sheet member.
is wider than the belt-shaped sheet member 11, and one inner surface thereof has a shape that almost matches the side surface shape of the sheet member 11.

The pressing member 13 is connected to the belt-shaped sheet member 11 and the groove 1.
The belt-shaped sheet member 11 has a wedge shape that fits into the narrowing space formed by the groove 12, and is configured so that the belt-shaped sheet member 11 is brought into close contact with the bottom and side surfaces of the groove 12 by fastening with the bolts a.

Among the plurality of members for pressing the sheet member, an end pressing member 13 that acts on the end side of the strip-shaped sheet member 11 and an adjacent pressing member 13 are arranged in a radial direction between the contact surfaces of the pressing member 13 and the adjacent pressing member 13. At the same time, mounting holes c, c for bolts a, a to the end pressing member 13 are formed as blank holes. , a protrusion that bites into the strip-shaped sheet member 11, that is, an engaging portion d... is provided, and the end pressing member 13 and the end side of the strip-shaped sheet member 11 are integrated by the biting protrusion, that is, the engaging portion d... By tightening the end pressing member 13 with the bolts a and a, the end side of the band-shaped sheet member 11 is integrated with the end pressing member 13 by a cam action using the other adjacent pressing member 13 as a reaction force point. The end face of the band-shaped sheet member 11 is brought into pressure contact with the annular sealing material 10 by moving toward the annular sealing material 10 side.

FIG. 6 shows the band-shaped sheet member 1 with respect to the annular sealing material 10.
1 shows a deformed structure for pressing contact with the slope b
, b are formed closer to the valve shaft 7 toward the valve body, and the end pressing member 13 is relatively moved toward the annular sealing material 10 side by tightening the adjacent pressing member 13 with the bolt a. It is something.

[Brief explanation of the drawing]

The drawings in FIGS. 1 to 6 show an embodiment of the mounting structure for the belt-shaped sheet member according to the present invention, in which FIG. 1 is a sectional view of the butterfly valve, FIG. 2 is a detailed view of the seal structure, and FIG. 3 is a sectional view of the butterfly valve. 4 is a sectional view of the seat member mounting structure, and FIG. 4 is a longitudinal sectional side view thereof. Fig. 5 is a broken perspective view of the pressing member, Fig. 6 is a sectional view showing a modified example of the seat member mounting structure, Fig. 7 is a sectional view showing a conventional example, and Fig. 8 is a partially enlarged sectional view. It is. DESCRIPTION OF SYMBOLS 1...Valve box, 11...Elastic band-shaped sheet member, 13...Press member, b...Slope, a...Engagement Department.

Claims (1)

[Claims] 1 Among the plurality of pressing members 13 that press and fix the elastic band-shaped sheet member 11 to the valve box 1, the pressing member 13 corresponding to 9 parts of the band-shaped sheet member 11 and the pressing member 1 adjacent thereto
3 are inclined with respect to the radial direction of the valve body 1, and this inclination is in contact with each other at the inclined surfaces b, b, which are inclined toward the side away from or approaching the valve shaft 7 on the far side in the radial direction, and The mounting holes c, c for the bolts a, a to the pressing member 13 on the end side are formed as blank holes, and the pressing member 13 on the end side is provided with the bolts a, c in the longitudinal direction with respect to the strip-shaped sheet member 11. 1. A mounting structure for a belt-shaped sheet member, characterized in that an engaging portion d is provided for locking the belt-shaped sheet member.