JPS6216553Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention constitutes a watertight blind cover for preventing earth and sand and spring water from entering through the openings of pipes being laid during various piping works. This relates to seal rings.

[Conventional technology]

Watertight blind lids (stop valves) are used in various types of piping work to prevent dirt and spring water from entering through the openings of the pipes being installed.

FIGS. 1 and 2 are vertical cross-sectional views of a conventional watertight blind lid, with some parts omitted. A bolt 3 is fixed to the center 0-0 of a disc-shaped lower lid 2 whose diameter is slightly smaller than that of the tube body 1, and a disc-shaped upper lid 4 whose diameter is slightly larger than that of the tube body 1 is attached to this bolt 3. A rubber seal ring 6 having a transverse V-shape or shape in cross section is inserted between the lower cover 2 and the upper cover 4 by penetrating the center thereof, and the upper cover 4 is tightened with a nut 5. This is what I did. When the nut 5 is tightened, the seal ring 6 is compressed and comes into close contact with the inner wall of the tube body 1 due to its elasticity, so that watertightness is obtained between the seal ring 6 and the tube body 1.

[Problem that the invention attempts to solve]

The seal ring 6 having the above shape is attached to the tube body 1.
Since the contact surface (elastic surface) with the tube body 1 is a wide surface contact, it cannot sufficiently follow small irregularities on the inner surface of the tube body 1, and therefore high watertightness cannot be obtained. As a result, they are unable to withstand the pressure of water and earth, and muddy water and earth and sand often seep into the pipes, which not only requires a large amount of money to drain and clean, but also affects the construction period.

The present invention was devised to solve the above-mentioned problems, and aims to provide a watertight seal ring that can improve watertightness and tightening workability.

[Means for solving problems]

In order to achieve the above object, the present invention includes both side surfaces made of an elastic material, a curved portion projecting in a chevron shape from above the both side surfaces, and an inverted V-shaped portion projecting between the both side surfaces from below the both side surfaces. A watertight seal comprising a hollow part formed by a bent part, a protruding part provided on the circumference near the top of the bent part, and a plurality of air vent holes provided on the circumference near the top of the bent part. It provides a ring.

[Effect]

When a seal ring is inserted between the lower and upper press covers and the nut is tightened, the side and bent parts of the seal ring are folded into the hollow part and come into surface contact, and the protruding part of the seal ring is inserted into the pipe. Protrudes from the wall and makes surface contact, providing high sealing performance.

〔Example〕

FIG. 3 is a longitudinal sectional view showing a part of a watertight blind lid using the seal ring according to the embodiment of the present invention. In addition,
The same or corresponding parts as in FIG. 1 and FIG. 2 are given the same reference numerals, and their explanation will be omitted. The seal ring according to the present invention is made of an elastic material such as rubber, and as shown in the cross-sectional view of FIG. curved parts b, b, and both side parts a,
Bent parts c, c protruding in an inverted V shape are provided between a, and these are connected together to form a hollow part d inside.
is formed. Furthermore, sponge-like protrusions e are integrally formed near the tops of the curved portions b, b, and annular protrusions f are formed on the outsides of the side surfaces a, a. Symbols g are air vent holes provided at appropriate intervals on the circumference of the tops of the bends c and c.

In order to seal the tube end with the seal ring configured as described above, the lower pusher cover 2 is attached as shown in Fig. 3.
A seal ring 6 is interposed between the top cover 4 and the top cover 4, and the nut 5 is tightened. Side parts a, a and bent parts c, c of the seal ring 6 sandwiched between the upper and lower press covers 2 and 4
is folded into the hollow part d, and the bent parts c and c come into surface contact with the side parts a and a, reducing the space in the hollow part d and reducing the degree of freedom of displacement of the curved parts b and b. and the seal ring 6 to maintain surface pressure retention. Furthermore, due to the shape characteristics of the curved portions b and b, the protruding portion e of the seal ring 6 compressed by the upper and lower press covers 2 and 4 protrudes to the tube wall and comes into surface contact with the tube wall, thereby achieving higher sealing performance. can.

On the other hand, the bent portions c, c are compressed by the upper and lower lids 2, 4, and are folded into four layers together with the side portions a, a, thereby maintaining the ability to maintain surface pressure against the tube wall. Further, the annular projections f provided on the outside of the side surfaces a and a prevent muddy water and dirt from entering between the seal ring 6 and the upper and lower lids 2 and 4.

Since the seal ring of the present invention is formed hollow, the nut 5 can be tightened with extremely small torque in the initial stage. In addition, due to the soft elasticity and adhesion of the spongy protrusion e, it adheres closely to the unevenness of the inner wall of the pipe and forms a continuous loop.
Furthermore, it can improve watertightness and prevent the intrusion of muddy water and earth and sand.

In the above description, a case has been described in which the protruding part e is integrated with the curved parts b, b, but a separately manufactured part may be adhered to the vicinity of the top of the curved parts b, b with an adhesive or the like. Furthermore, although the protrusion e has been described as being spongy, it is not limited to this; for example, the outer periphery may be formed into sawtooth-like irregularities e' as shown in FIG.

[Effect of idea]

As is clear from the above explanation, the seal ring of the present invention can significantly improve watertightness, so it can be applied to watertight blind lids to prevent mud and earth from entering, and the tightening workability has also improved, making it practical. It is highly effective when applied to

[Brief explanation of drawings]

Figures 1 and 2 are vertical cross-sectional views of a conventional watertight blind lid with some parts omitted, and Figure 3 is a vertical cross-sectional view of a part of a watertight blind lid using the seal ring of the embodiment of the present invention. Figure 4 is a vertical cross-sectional view of the embodiment of the present invention, Figure 5 is
The figure is a longitudinal sectional view of another embodiment of the protrusion. 6: seal ring, a: side part, b: curved part,
c: bent part, d: hollow part, e: protrusion part.

Claims (1)

[Scope of utility model registration request] A hollow portion is formed by both side surfaces made of an elastic material, a curved portion projecting in a chevron shape from above the both side surfaces, and a bent portion projecting in an inverted V-shape between the both side surfaces from below the both side surfaces, and the curved A watertight seal ring comprising a protrusion on the circumference near the top of the bent part and a plurality of air vent holes on the circumference near the top of the bent part.