JP2002106782A - Mechanism for sealing inner surface of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism for sealing an inner surface of a pipe capable of precisely cutting-off a fluid in a short time, by inserting a valve element into a joint and a pipe for sealing the inner surface of the pipe, when an already existing pipe replacement work is carried out without stopping fluid supply into the inside of the pipe. SOLUTION: Between disc flanges 3, 3 on both sides, a core 2 and a ring- shaped elastic disc 1 are interposed. Between the core 2 and the elastic disc 1, an annular pressure receiving part 4 is formed, and a pressurized fluid guide hole 6 is formed opposite to the annular pressure receiving part 4. In an operation rod 5 arranged in the center portion of the core 2, a guide pressure hole 7 is formed opposite to the pressurized fluid introducing hole 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inner surface sealing mechanism, which is relatively simple and compact when replacing existing pipes without stopping fluid supply inside the pipe body. Is to be inserted into a pipe to seal the inner surface of the pipe and to provide a mechanism capable of properly shutting off fluid in a short time.

[0002]

2. Description of the Related Art In the case of laying in a fluid supply line such as gas or water, it is necessary to close and block the flow of internal fluid. Although the use of the conventional technology has long been adopted, such a conventional technology requires a certain length for stable mounting in a pipeline and can form an accurate sealing state. It is not easy and inevitably requires considerable man-hours.

In some cases, a tube is used for the purpose of sealing the above-mentioned fluid conduit. That is, an attempt is made to seal the inner surface of the tube by expanding the tube.

[0004]

Since the conventional tube method as described above seals the inner surface of the tube by inflating the tube, the obtained sealing state is a potential for the tube to shrink. It is necessary to perform the joint sealing by overcoming both the acting force and the fluid pressure in the pipe, and it is basically difficult to secure a stable seal.

[0005] In particular, in any case of a fluid pipe such as a gas pipe, the inner hole has a relatively small diameter, so that it is inevitable to be a small seal body. It is not easy to form a condition and maintain a seal that withstands fluid pressure in the tube.

[0006]

SUMMARY OF THE INVENTION The present invention has been studied to solve the problems in the prior art as described above, and forms an effective and accurate sealing state by appropriately using fluid pressure as a sealing force. , And succeeded in obtaining a stable seal, as described below.

(1) A core and a ring-shaped elastic disk are interposed between both disk flanges to form an annular pressure receiving portion between the core and the elastic disk, and a pressurized fluid introduction hole for the annular pressure receiving portion is formed. A pipe inner surface sealing mechanism, wherein a pressure guiding hole for the pressurized fluid introduction hole is formed in an operating rod provided at a central portion of the core.

[0008] (2) The tube inner surface sealing mechanism according to the above item (1), wherein the ring-shaped elastic disk has flat both side surfaces.

(3) The tube inner surface sealing mechanism according to the above item (1), wherein substantially parallel bends are formed inside and outside both side surfaces of the ring-shaped elastic disk.

(4) A centering piece is disposed on the peripheral side of the disk flange.
(3) The tube inner surface sealing mechanism according to any one of the above (3).

(5) The above-mentioned (1) to (4), characterized in that a groove is provided in the center of the peripheral surface of the ring-shaped elastic disk.
(4) The tube inner surface sealing mechanism according to any one of the above (4).

(6) The above-mentioned (1) to (5), wherein an annular engaging groove is provided on the peripheral side of the core so as to be engaged with an engaging protrusion formed inside the ring-shaped elastic disk. The pipe inner surface sealing mechanism according to any one of the above items).

According to the present invention as described above, a core and a ring-shaped elastic disk are interposed between disk flanges on both sides, an annular pressure-receiving portion is formed between the core and the elastic disk, and the annular pressure-receiving portion is formed. The ring-shaped elastic disk is set in the pipe in a state where the ring-shaped elastic disk is appropriately shaped by the disk flange and the core by forming the pressurized fluid introduction hole with respect to the above, and an appropriate sealing relationship is formed by the ring-shaped elastic disk.

The object of the present invention as described above can be achieved by a relatively simple and compact structure because the ring-shaped elastic disk has flat both side surfaces.

By forming substantially parallel bends inside and outside both side surfaces of the ring-shaped elastic disk, the elastic disk can be expanded and contracted in the radial direction by a relatively small ring-shaped elastic disk, so that an effective blockage against the inner surface of a pipe having a considerably large diameter can be obtained. The seal can be achieved smoothly and properly with relatively small operating force.

By forming a pressure guiding hole for the pressurized fluid introduction hole in the operation rod provided at the center of the core as described above, the pressurized fluid is adopted as a sealing force, and as described above, an appropriate sealing relationship is obtained. An effective sealing state is formed in the ring-shaped elastic disk formed with.

By arranging the centering piece on the peripheral side of the disk flange as described above, the outer diameter and the pipe thickness of the pipe to be applied are obtained, and the centering piece is adjusted in accordance with the inner diameter obtained by calculation, and an appropriate value is obtained. Make settings.

By arranging the groove in the center of the peripheral surface of the ring-shaped elastic disk, the fluid in the pipe acts on the groove appropriately, that is, the sealing action utilizing the fluid pressure in the pipe is obtained in the groove. Can ensure a stable seal, leakage prevention.

An annular engaging groove is provided on the peripheral side of the core, and is engaged with an engaging protrusion formed inside the ring-shaped elastic disk, whereby the core is properly engaged with the ring-shaped elastic disk. And secures the setting and sealing action of the ring-shaped elastic disk.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention as described above will be described with reference to the accompanying drawings. The general structure of the present invention is as shown in FIGS. As shown in FIG. 2, the ring-shaped elastic disk 1 has a core 2 in the center portion, and disk flanges 3 are provided on both sides of the ring-shaped elastic disk 1 and the core 2 so that a plurality of rings are provided. It is fixed to the core 2 from both sides by the mount 11.

The core 2 has a locking groove 12 at its peripheral edge.
And the locking projections 13 are formed concentrically, and the ring-shaped engaging projections 14 formed on the inner diameter side of the ring-shaped elastic disk 1 are received in the locking grooves 12, and are provided between the disk flanges 3 on both sides. A ring groove 15 is formed on the inner diameter side of the elastic disk 1, an outer groove 16 is formed on the outer diameter center, and lip portions 17, 17 are formed on both sides of the outer groove 16. It is designed to secure the joint sealing property to the inner surface of the tube body 10 as shown in FIG. 4 to be provided and applied.

A pressurized fluid introduction hole 6 is formed in the core 2 as described above.
The pressurized fluid introduction hole 6 is connected to the operation rod 5 attached to the disc flange 3 via a connection hole (pressure-conduction hole) 7 orthogonal to the core 2. And a predetermined fluid pressure is applied to the inner cavity 4 through the inner hole 9 so that the lip portions 17 and 17 are connected to the tube 1.
0 to form an effective seal.

As shown in FIGS. 2 and 3, a plurality of centering pieces 18 are provided on the disk flange 3 mounted on the disk 1 as described above. That is, the outer diameter and the pipe thickness of the pipe 10 are measured, and the centering piece 18 is adjusted and set in accordance with the calculated inner diameter. As shown in FIG. It is formed and fixed, and in this state, as shown in FIG.
When the elastic disk 1 is expanded and expanded by filling the elastic disk 1 with a gas or liquid fluid after the elastic disk 1 is set in a state of being joined and supported on the inner surface of the tubular body 10, the elastic disk 1 is expanded as shown in FIG. A sealing relationship is formed in which the inner surface of the tube is extended and supported in a balanced set state.

FIGS. 8 to 10 show a structure which can appropriately respond to the case where the inner diameter of the tube to be applied by the present invention is considerably larger than the case shown in FIGS. It is shown. That is, the elastic disk 1 shown in FIGS. 1 to 7 does not have a particularly large diameter.
The ring groove 15 is simply filled with a pressurized fluid, and the groove 16 and the lip 17 are joined and sealed to the inner surface of the tube. On the other hand, in those shown in FIGS. A pressure fluid is introduced into the grooved pressure receiving portion 15 through the pressure guiding hole 7 and the pressurized fluid introduction groove 6 as shown in FIG. Is configured to change in diameter.

That is, the elastic disk 1a expands and contracts sufficiently as described above, and is adapted to the diameter of the pipe to be applied, thereby facilitating the loading / unloading operation of the disk with respect to the pipe. It is possible to make the joint sealing state of the disk 1a to a predetermined constant state, and obtain a reasonable and accurate set and measurement result. Regardless of the radial expansion and contraction of the disk 1a, the both ends in the radial direction are relatively thick, so that a stable mounting state and a sealing state can be ensured, so that laying of existing pipes and other work can be performed efficiently and effectively. .

[0026]

According to the present invention as described above, replacement of existing pipes to be applied can be carried out smoothly, effectively and appropriately by means of a turning work in which the supply of fluid is performed without stopping. It is an invention which is industrially effective.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a pipe inner surface sealing mechanism according to the present invention.

FIG. 2 is a cross-sectional view of what is shown in FIG.

FIG. 3 is a rear view of the one shown in FIGS.

FIG. 4 is a partially cutaway side view of a rubber disk.

FIG. 5 is a partially cutaway front view of a half portion of a rubber disk.

FIG. 6 is an explanatory view of a setting state in a tube using a centering piece of a disk according to the present invention.

7 is a cross-sectional view of a state where air is filled in a rubber disk from the state of FIG. 6;

FIG. 8 is a partial front view showing another configuration relationship according to the present invention.

FIG. 9 is a partially cutaway side view of the one shown in FIG.

FIG. 10 is a general front view of what is shown in FIG. 8 as viewed from the back side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring-shaped elastic disc 2 Core 3 Disc flange 4 Annular pressure receiving part which is a bore of disc 5 Operating rod 6 Pressurized fluid introduction hole 7 Connecting hole (pressure guide hole) 9 Inner hole 10 Tube 11 Mounter 12 Lock groove DESCRIPTION OF SYMBOLS 13 Locking protrusion 14 Engagement protrusion 15 Ring groove 16 Groove part 17 Lip part 18 Centering piece

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000230526 Nihon Victoria Co., Ltd. 2-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo (72) Inventor Yoshio Akiyama 17-1 Hommachi, Fussa-shi, Tokyo Takeyo Gas Co., Ltd. Inside the company (72) Inventor Satoshi Maeda 2-17-4 Kuramae, Taima-ku, Tokyo Kawatetsu Techno-Contraction Traction Co., Ltd. (72) Inventor Akira 2-17-4 Kuramae, Taito-ku, Tokyo Kawatate Techno-Cono Traction Stock Inside the Company (72) Inventor Masahiko Yoneda 2-17-4 Kuramae, Taito-ku, Tokyo Kawatetsu technocontraction Traction Co., Ltd. (72) Inventor Akihito Mouri 2-19-6 Nakaikekami, Ota-ku, Tokyo Oogi Precision Stock In-house (72) Inventor Takamitsu Suzuki 2-19-6 Nakaikegami, Ota-ku, Tokyo (72) Shintaro Ikeda, Shintaro Ikeda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo East Keiyo Marine Building Nippon Victory Co., Ltd. (72) Yuji Noda 1-1-2, Marunouchi, Chiyoda-ku, Tokyo East (72) Inventor Akifumi Kono 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term in Japan Victoria Co., Ltd. (Reference) 3H025 DA02 DB12 DC02 3J043 AA02 BA09 CA04 CB13

Claims (6)

[Claims] 1. A core and a ring-shaped elastic disk are interposed between disk flanges on both sides, an annular pressure receiving portion is formed between the core and the elastic disk, and a pressurized fluid introduction hole for the annular pressure receiving portion is formed. A tube inner surface sealing mechanism, wherein a pressure guiding hole for the pressurized fluid introduction hole is formed in an operation rod provided at a central portion of the core. 2. The tube inner surface sealing mechanism according to claim 1, wherein the ring-shaped elastic disk has flat both side surfaces. 3. The tube inner surface sealing mechanism according to claim 1, wherein substantially parallel bends are formed inside and outside both side surfaces of the ring-shaped elastic disk. 4. The pipe inner surface sealing mechanism according to claim 1, wherein a centering piece is arranged on a peripheral side of the disk flange. 5. The ring-shaped elastic disk according to claim 1, wherein a groove is provided in the center of the peripheral surface.
4. A pipe inner surface sealing mechanism according to any one of the above. 6. An annular engaging groove is provided on a peripheral side of a core, and is engaged with an engaging protrusion formed inside a ring-shaped elastic disk. The tube inner surface sealing mechanism according to one of the above aspects.