JP2000145356A - Elastic packing and pit mouth sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic packing and a pit mouth sealing device, which are manufactured easily and which have excellent sealing properties and durability. SOLUTION: The elastic packing 10 has an outer circumferential end 10b and an inner circumferential end 10a installed to a pit mouth such as a tunnel hole, and has a cubic shape extended in an umbrella shape extending over the outer circumferential end from the inner circumferential end. The elastic packing comprises a plate-shaped elastic raw material 11 formed in a contour shape obtained by developing the cubic shape, and is formed in the cubic shape by joining the open ends 11a, 11b of the elastic raw material 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device attached to a wellhead or the like of a shaft, and more particularly to a three-dimensional elastic packing umbrella-shaped from the inner peripheral end to the outer peripheral end and a wellhead seal provided with the elastic packing. Related to the device.

[0002]

2. Description of the Related Art Conventionally, as a wellhead sealing device to be mounted on a wellhead of a shaft, as shown in FIG. 8, an elastic packing 1 made of rubber or the like and an outer peripheral end 1a of the elastic packing 1 are mounted on a wellhead 2. The one provided with the member 3 is known. The inner peripheral end 1 b of the elastic packing 1 is a wellhead 2
It has an opening shape smaller than the outer shape of the tunnel segment, the fume tube 4 and the like disposed inside the elastic packing when the propulsion device, the tunnel segment or the fume tube 4 or the like is inserted into the tunnel from the wellhead 2. Inner end 1 of 1
b is expanded on the outer peripheral surface of the fume tube 4 or the like and is closely attached to the outer peripheral surface to seal the gap between the wellhead 2 and the fume tube 4 or the like. When no backing member is provided on the back side (the right side in FIG. 8) of the elastic packing 1 against external pressure, the elastic packing 1 itself must be formed of a harder elastic material so that the elastic packing 1 can withstand the external pressure. is there.

As an elastic packing used in this type of wellhead sealing device, as shown by a two-dot chain line in FIG. 8, a structure in which the whole is formed in a flat shape when the inner peripheral end 1b is released is generally used. As shown in FIG. 9A, an elastic packing 1 having a three-dimensional shape that expands like an umbrella from the inner peripheral end 1b to the outer peripheral end 1a has been considered. When the elastic packing 1 has such a three-dimensional shape, the elastic packing 1 can easily withstand an external pressure, and the inner peripheral end thereof can be more easily expanded with a fume tube or the like as compared with an elastic packing having a flat plate as a whole. Even when the elastic packing 1 is formed of a hard rubber material, the insertion of the propulsion device, the tunnel segment, the fume tube, etc. is facilitated, and the elastic packing 1 is prevented from being cracked due to excessive force. It becomes possible. In particular, when the inner peripheral end of the elastic packing 1 has a substantially rectangular shape, the concentration of stress generated at the inner peripheral corner can be relaxed, and the generation of cracks can be effectively prevented.

[0004]

In order to manufacture the above-mentioned three-dimensional elastic packing, dies 5 and 6 for rubber vulcanization molding as shown in FIG. (B)
For example, a method of vulcanizing and forming four divided rubber pieces 7 as shown in FIG. 9 and vulcanizing and bonding them to integrate them into a three-dimensional shape shown in FIG. It is necessary to form a complicated three-dimensional cavity in each of the bonding dies. In addition, since it is necessary to separately manufacture molds for vulcanization molding and vulcanization bonding according to the required size of the elastic packing, the production cost is greatly increased.

Accordingly, an object of the present invention is to provide an elastic packing and a wellhead sealing device which are easy to manufacture and have excellent sealing properties and durability.

[0006]

In order to solve the above-mentioned problems, the present invention has an outer peripheral end and an inner peripheral end attached to a wellhead such as a tunnel hole, and extends in an umbrella shape from the inner peripheral end to the outer peripheral end. An elastic packing having a three-dimensional shape, wherein the elastic packing is made of a flat plate-shaped elastic material having a contour shape developed from the three-dimensional shape, and an open end of the elastic material is joined to form a three-dimensional shape. It is characterized by the following.

[0007] Since the elastic packing having the above structure has an umbrella-shaped three-dimensional shape extending from the inner peripheral end to the outer peripheral end,
Propeller, tunnel segment,
When it is brought into close contact with the outer peripheral surface of an arrangement such as a fume tube, it can exhibit high sealing performance against external pressure, and the inner peripheral end of the elastic packing can be easily expanded by the outer peripheral surface of the arrangement. Can be done. Therefore, it is possible to prevent the inner peripheral end of the elastic packing from being forcibly pushed and expanded to generate a crack, and to improve durability. In addition, the three-dimensional elastic packing is made of a flat elastic material, and this elastic material can be cut out from a general-purpose rubber sheet into a required size. A three-dimensional elastic packing can be made without the need. Further, since the elastic material is flat, it is not necessary to use a complicated three-dimensional cavity-shaped joining mold when joining the open ends thereof. Therefore,
An elastic packing of an arbitrary size having a three-dimensional shape can be easily manufactured.

[0008] Preferably, the elastic material is formed by joining a plurality of plate-like elastic pieces together. According to this configuration, the required number of plate-like elastic pieces can be cut out from a general-purpose rubber sheet with good material efficiency, so that a lower-cost elastic packing and wellhead seal device can be provided.

The wellhead sealing device according to the present invention includes the elastic packing and a mounting member for mounting the outer peripheral end of the elastic packing to a wellhead such as a shaft.
A wellhead sealing device that is easy to manufacture, has excellent sealing properties and durability, and is easy to attach to a wellhead can be provided.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0011]

1 to 3 show one embodiment in which the present invention is applied to a rectangular elastic seal for a wellhead seal. FIGS. 1 (a) and 1 (b) show flat plates, respectively. 2A and 2B are a plan view and a side view of an elastic packing formed by joining the flat elastic material shown in FIG. 1A, respectively. FIG. 3 is a schematic sectional view of a main part of a joining apparatus showing a joining method of a flat elastic material.

Referring first to FIGS. 1 and 2, the flat elastic material 11 shown in FIG.
The elastic packing 10 shown in FIG. 2B has an expanded contour of the three-dimensional elastic packing 10, and the elastic packing 10 shown in FIGS. 2A and 2B has substantially rectangular inner and outer contours. It has a three-dimensional shape that expands like an umbrella from the peripheral end 10a to the outer peripheral end 10b.

The elastic material 11 may be formed by cutting a single elastic sheet, for example, a rubber sheet, into the contour shape shown in FIG. 1A. In this embodiment, a plurality of plates cut out from the rubber sheet are formed. The elastic members 12 are joined and joined together to form an elastic material 11 having a contour shape shown in FIG. When the plate-like elastic material 11 is formed by a plurality of plate-like elastic pieces 12 as described above,
Since the plate-like elastic pieces 12 can be cut out from a flat sheet material with good yield, the manufacturing cost of the elastic packing 10 can be reduced. In addition, since the elastic material 11 can be made from a sheet material having a size smaller than the outer size of the elastic material 11, storage and management of the sheet material are facilitated.

The open ends 11a and 11b of the flat elastic material 11 shown in FIG. 1A are bonded (for example, vulcanized) to each other via an adhesive rubber material 13 as shown in FIG. Accordingly, a three-dimensional elastic packing 10 as shown in FIG. 2 can be obtained.

As shown in FIG. 3, the bonding apparatus used for vulcanization bonding of the elastic material 11 includes a pair of bonding dies 14, 14 each having a heater 15 therein.
After the open ends 11a and 11b of the elastic material 11 are brought into contact with each other through the joint 3, the open ends 11a and 11b of the elastic material 11 are sandwiched by the joining molds 14 and 14 and vulcanization bonding is performed while pressing. Has become. Since the elastic material 11 has a flat plate shape, the pressing surface of the joining mold 14 that sandwiches the elastic material 11 may be a flat surface, is easy to process, and can be used for joining the elastic material 11 of any size. . This joining device can also be used for mutual joining of the above-mentioned plate-like elastic pieces 12. Therefore, the elastic packing 10 can be manufactured by using an inexpensive joining device having a simple mold shape.

FIG. 4 shows an embodiment of a wellhead sealing device according to the present invention. A tunnel hole 17 having a rectangular cross section is opened in a hole wall of a shaft or the like, and a wellhead sealing device is provided at the wellhead 17a. Is provided. Fig. 2
(A) a three-dimensional elastic packing 10 shown in (b);
A mounting member 16 for mounting the elastic packing 10 on the wellhead 17a.

The mounting member 16 has a mounting portion 16a for mounting the outer peripheral end 10b of the elastic packing 10. In this embodiment, the mounting portion 16a is compatible with the umbrella-shaped three-dimensional shape of the inner surface of the elastic packing 10. It is bent in a substantially umbrella shape. Reference numeral 18 denotes a bolt for fixing the elastic packing 11 to the mounting member 16, and reference numeral 19 denotes an anchor bolt for fixing the mounting member 16 to the wellhead 17. As shown in FIG. 2A, the elastic material 11 has a mounting hole 11c through which the bolt 18 passes.

In the wellhead sealing device having the above structure, the elastic packing 10 is moved from the inner peripheral end 10a to the outer peripheral end 1a.
0b, the inner peripheral end 10a of the elastic packing 10 is brought into close contact with the outer peripheral surface of an arrangement body such as a propulsion unit, a tunnel segment, a fume tube, etc. (not shown). Sometimes high sealing performance against external pressure can be demonstrated. Further, since the inner peripheral end 10a of the elastic packing 10 can be easily expanded by the outer peripheral surface of the arrangement body such as the propulsion device, the tunnel segment, the fume tube, etc., the inner peripheral end 10a of the elastic packing 10 is forcibly pushed. It is possible to prevent the cracks from being generated at the inner peripheral corners or the like due to the expansion, and the durability can be improved. In addition, the three-dimensional elastic packing 10
Is made of a flat elastic material 11. This elastic material 11 can be cut out from a general-purpose rubber sheet or the like to a required size. A shaped elastic packing 10 can be made. Further, since the elastic material 11 is flat, the joining dies 14, 14 having a simple shape can be used when joining the open ends 11a, 11b. Therefore, the elastic packing 10 having an arbitrary size having a three-dimensional shape can be easily manufactured.

FIGS. 5 (a), 5 (b) and 5 (c) show other embodiments of the wellhead sealing device according to the present invention. 5 (a), 5 (b) and 5 (c) are different from the above embodiments only in the mounting member 16 and the mounting form of the elastic packing 10 on the mounting member 16. The shape and manufacturing method are the same as those in the above embodiment.

In the embodiment shown in FIG.
Has a fixing member 20 attached to the wellhead 17a and a holding plate 21. The fixing member 20 is
It has a mounting portion 21a which is bent in a substantially umbrella shape so as to be fitted to the outer surface of the outer peripheral end 10b. The pressing plate 21 is formed in a substantially umbrella shape so as to fit with the inner surface of the outer peripheral end 10b of the elastic packing 10. Although the mounting member 16 of this embodiment has more parts than the mounting member shown in FIG. 4, the mounting of the elastic packing 10 to the mounting member 16 can be easily performed inside the shaft.

In the embodiment shown in FIG.
Has a fixing member 20 and a holding plate 21 similarly attached to the wellhead 17a.
0 is formed in a flat plate shape, and the holding plate 21 is also formed in a flat plate shape. Therefore, in the case of this embodiment, the elastic packing 10 is attached to the attachment member 16 in a state where the outer peripheral end 10b is extended in a flat plate shape.
In the case of this embodiment, since the fixing member 20 and the pressing plate 21 constituting the mounting member 16 are simple flat plates, their manufacture is easy. Further, as shown, the fixing member 20
The elastic packing 10 can be attached to the attachment member 16 using the anchor bolt 19 for attaching the elastic packing 10 to the wellhead 17a.

In the embodiment shown in FIG.
Has a fixing member 20 and a holding plate 21 similarly attached to the wellhead 17a.
Reference numeral 0 indicates that the mounting portion 20a is bent at a substantially right angle so as to form a substantially cylindrical shape in accordance with the cross-sectional shape of the tunnel hole 17, and the holding plate 21 is also formed in a substantially cylindrical shape. Therefore, in the case of this embodiment, the elastic packing 10 is attached to the attachment member 16 in a state where the outer peripheral end 10b is reduced to a substantially cylindrical shape.

FIGS. 6 and 7 show an embodiment in which the present invention is applied to a circular elastic seal for a wellhead seal. Referring to these drawings, the flat elastic material 31 shown in FIG. 6A has a contour shape obtained by developing the three-dimensional elastic packing 30 shown in FIGS. 7A and 7B. The elastic packing 30 shown in (a) and (b) has a frusto-conical inner peripheral surface and an outer peripheral surface shape, and has an umbrella-shaped three-dimensional shape extending from the inner peripheral end 13a to the outer peripheral end 30b. .

The elastic material 31 may be formed by cutting a single elastic sheet, for example, a rubber sheet, into the contour shape shown in FIG. 6A. In this embodiment, a plurality of plates cut out from the rubber sheet are formed. The elastic members 32 having a contour shape shown in FIG. 6A are formed by joining and joining the elastic members 32 together. When the plate-like elastic material 31 is formed by a plurality of plate-like elastic pieces 32 as described above,
Since the plate-like elastic pieces 32 can be cut out from the flat sheet material with high yield, the manufacturing cost of the elastic packing 30 can be reduced. Further, since the elastic material 31 can be made from a sheet material having a size smaller than the outer size of the elastic material 31, storage and management of the sheet material become easy.

The flat elastic material 31 shown in FIG. 6 (a) has its open ends 31a, 31b connected to an adhesive rubber material (not shown).
By vulcanizing and adhering to each other through the through hole, a three-dimensional elastic packing 30 as shown in FIG. 7 can be obtained.
Using this elastic packing 30, a wellhead sealing device having a cross-sectional structure as shown in FIGS. 4 and 5 can be formed in the same manner as in the above embodiment.

Although the illustrated embodiment has been described above, the present invention is not limited to only the above embodiment.
Various changes can be made to the components within the scope of the invention described in the claims. For example, the elastic packing is not limited to one having a rectangular or circular contour shape, and may have any contour shape, for example, an oval shape, an elliptical shape, a horseshoe shape, a dharma shape, or the like according to the shape of a wellhead to be applied.

[0027]

As is apparent from the above description, the present invention provides a three-dimensional elastic packing that expands in an umbrella shape from the inner peripheral end to the outer peripheral end by forming a flat elastic member having a contour shape obtained by developing the three-dimensional elastic packing. Since it is formed of a material and is formed into a three-dimensional shape by joining the open ends of the elastic material, it is possible to provide an elastic packing which is easy to manufacture and has excellent sealing properties and durability. Further, by using this elastic packing, it is possible to provide a wellhead sealing device which is easy to manufacture and has excellent sealing properties and durability.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a side view, respectively, showing a flat elastic material for forming an elastic packing according to the present invention.

2 (a) and 2 (b) are a plan view and a side view showing an elastic packing formed by joining the flat elastic material shown in FIG. 1 (a), respectively.

FIG. 3 is a schematic sectional view of a main part of a joining apparatus showing a joining method of the elastic material shown in FIG.

FIG. 4 is a sectional view of a wellhead showing one embodiment of a wellhead sealing device using the elastic packing shown in FIG. 2;

FIGS. 5 (a), (b), and (c) are cross-sectional views of main parts showing another embodiment of a wellhead sealing device according to the present invention.

FIGS. 6A and 6B are a plan view and a side view showing a flat elastic material for forming an elastic packing according to the present invention, respectively.

7 (a) and 7 (b) are a plan view and a side view showing an elastic packing formed by joining the flat elastic material shown in FIG. 6 (a), respectively.

FIG. 8 is a sectional view showing the structure of a conventional wellhead sealing device.

FIGS. 9A, 9B, and 9C are explanatory views showing a reference example of an elastic packing and a method of manufacturing the elastic packing, respectively.

[Explanation of symbols]

 10, 30 Elastic packing 10a, 31a Inner peripheral end 10b, 31b Outer peripheral end 11, 31 Elastic material 11a, 11b, 31a, 31b Open end 12, 32 Plate elastic piece 13 Adhesive rubber material 14 Joining mold 15 Heater 16 Mounting member 16a Mounting section 17 Tunnel hole 17a Wellhead 18 Bolt 19 Anchor bolt 20 Fixing member 20a Mounting section 21 Press plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 390027661 Kanazawa Seisakusho Co., Ltd. 7-7-9, Nishigotanda, Shinagawa-ku, Tokyo (72) Inventor Mitsuru Shinohara 1-7-1, Kyobashi, Chuo-ku, Tokyo, Takeda Toda (72) Inventor Akira Usami 1-7-1 Kyobashi, Chuo-ku, Tokyo, Toda Takeshi Incorporated (72) Inventor Takeshi Yagura 1-7-1, Kyobashi, Chuo-ku, Tokyo, Toda Takeshi (72) Inventor Seiichi Matsushita 1-7-1 Kyobashi, Chuo-ku, Tokyo; Toda Construction Co., Ltd. (72) Inventor Junichi Aikawa 1-2-3, Shibaura, Minato-ku, Tokyo, Shimizu Construction Co., Ltd. (72) Inventor Kuniyoshi Kato 1-24-4 Shinkawa, Chuo-ku, Tokyo, Daitoyo Construction Co., Ltd. Formula company Kanazawa Plant in the F-term (reference) 2D055 BA01 LA01

Claims (3)

[Claims] 1. A three-dimensional elastic packing having an outer peripheral end and an inner peripheral end attached to a wellhead of a tunnel hole or the like, and expanding in an umbrella shape from the inner peripheral end to the outer peripheral end. An elastic packing comprising a flat plate-shaped elastic material having an expanded contour shape, wherein open ends of the elastic material are joined to each other to form a three-dimensional shape. 2. The elastic packing according to claim 1, wherein said elastic material is formed by joining a plurality of plate-like elastic pieces to each other. 3. A wellhead sealing device comprising: the elastic packing according to claim 1; and a mounting member for mounting an outer peripheral end of the elastic packing to a wellhead such as a shaft.