JP3695821B2 - Airtight tool for pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airtight tool for pipes. Specifically, after completion of gas pipe repair or laying work, etc., it is attached to the pipe end to forcibly send gas into the pipe, so-called air purge work to remove the remaining air in the pipe, or air to the pipe, Filled with gas such as city gas, natural gas, LPG gas, etc., used for airtightness confirmation work (airtightness test) to check if there is any leakage in the piping part, or intrusion of dust or sewage into the pipe during construction The present invention relates to an airtight tool for a pipe used as a temporary stopper for preventing it.
[0002]
[Prior art]
As shown in FIG. 4 (a), a conventional airtight tool for a pipe is, in principle, screwed into a disk 1 and a screw hole provided in the center of the disk 1, and a flange 2 is attached to one end. A substantially barrel-shaped elastic sealing member (rubber or the like) 4 is inserted between the bolt 3 and the flange 2 and the disc 1.
[0003]
And as shown in the figure (b), by inserting the elastic sealing member 4 in the edge part of the pipe 5 which should be sealed, and rotating the volt | bolt 3 in the direction which compresses this elastic sealing member 4, The elastic sealing member 4 is expanded in the radial direction, and can be hermetically sealed by contacting and pressing the inner diameter of the pipe 5.
[0004]
[Problems to be solved by the invention]
In the conventional pipe hermetic tool, the retaining force against the gas pressure in the pipe is only due to the friction between the elastic sealing member 4 and the inner surface of the pipe 5, so that the gastight tool comes off the pipe 5 when the gas pressure is high. There is a case. If the airtight tool is detached, there is a problem that it may lead to a serious accident.
[0005]
In view of the above-described conventional problems, an object of the present invention is to realize an airtight tool for a pipe that is provided with a measure for preventing a disconnection and that can reliably hermetically seal a pipe.
[0006]
[Means for Solving the Problems]
The pipe hermetic tool of the present invention is a detachable pipe hermetic tool that is attached to the end of the pipe and seals its opening, and includes a main body having a coupler, a housing, an elastic sealing member, The main body has an outer diameter substantially the same as the outer diameter of the pipe to be sealed, an annular groove is formed on the outer periphery, and a hole that rotatably supports the coupler at the center of the main body The housing has an annular shape having an inner diameter that is substantially the same as the outer diameter of the pipe to be sealed, and is divided into two parts and hinged at one end, and a fastening means is provided at the other end. Furthermore, an annular protrusion that engages with the annular groove of the main body and an anti-slip means that contacts the outer periphery of the pipe to be sealed are provided on the inner diameter of the housing, and the elastic sealing member is made of an elastic material. Of pipes to be formed and sealed The pressing member sandwiches the elastic sealing member between itself and the main body, and presses the elastic sealing member by the pressing means of the coupler screw inserted through the main body. It is characterized in that the pipe can be sealed by expanding in the radial direction.
[0007]
In addition, the elastic sealing member has a mountain shape or an arc shape whose cross section swells outward. The coupler is characterized in that a lever handle is provided at a right angle to the axial direction.
[0008]
By adopting this configuration, it is possible to obtain an airtight tool for a pipe that is provided with a measure against slipping out and that can reliably hermetically seal the pipe.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 is a view showing an embodiment of the present invention, FIG. 1 is a front view, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. As shown in the figure, the present embodiment includes a main body 11 having a coupler 10, a housing 12, an elastic sealing member 13, and a pressing member 14.
[0010]
The main body 11 has a disk shape having an outer diameter substantially equal to the outer diameter of the pipe 15 to be sealed, and an annular groove 11a is provided on the outer periphery thereof. A cylindrical portion slightly smaller than the inner diameter of the pipe 15 to be sealed is formed on one surface thereof, and a step portion 11b that supports the elastic sealing member is formed on the cylindrical portion. Further, a through hole 11c through which the threaded portion 10a of the coupler 10 is inserted is formed in the center of the main body 11, and two O-ring grooves 11d are formed in the through hole 11c. Is charged. The threaded portion 10a of the coupler 10 is inserted through the through hole 11c. The coupler 10 is provided with a lever handle 10b for facilitating the rotation operation.
[0011]
The housing 12 has an annular shape having an outer diameter substantially equal to the outer diameter of the pipe 15 to be sealed, and is divided into two parts in the vertical direction, one end of which is hinged by a hinge pin 16 and the other end is Tightening means by bolts 17 is provided. An annular protrusion 12a that engages with the annular groove 11a of the main body 11 is formed at the end of the housing 12, and a sawtooth-shaped annular concavo-convex shape is provided on the inner diameter as the anti-slip means 12b.
[0012]
The elastic sealing member 13 is formed in a ring shape from an elastic material such as silicon rubber. Its outer diameter is slightly smaller than the inner diameter of the pipe 15 to be sealed, and its cross section has a mountain shape or an arc shape bulging outward.
[0013]
The pressing member 14 has a bottomed cylindrical shape having a flange portion, and the flange portion is provided with a stepped portion 14a for supporting the elastic sealing member 13, and the elastic sealing is provided between the pressing member 14 and the main body 11. The member 13 is supported. An internal thread is formed at the center of the cylindrical bottom and is screwed into the threaded portion 10a of the coupler 10.
[0014]
This embodiment configured as described above is used as shown in FIG. That is, the fastening means of the housing 12 is loosened, and the pressing member 14 and the elastic sealing member 13 are inserted into the pipe 15 until the main body 11 contacts the end of the pipe 15 to be sealed, and then the fastening means of the housing 12 is used. Tighten and fix to pipe 15. Next, the coupler 10 is rotated by the lever handle 10b, and the pressing member 14 is drawn to the main body 11 by the screw portion 10a. As a result, the elastic sealing member 13 is pressed and expands in the radial direction so as to adhere to the inner diameter of the pipe 15 and seal the pipe.
[0015]
Then, air or gas can be fed into the pipe 15 from the coupler 10 through the hole 10c. In this case, even if the present embodiment is pressed in the direction in which the present embodiment comes out from the pipe due to the pressure in the pipe, the slip prevention means 12b provided in the housing 12 bites into the pipe, so that it is prevented from coming out. Further, if the coupler 10 is provided with a blind cover, it is possible to prevent intrusion of dust or dirty water into the pipe during construction.
[0016]
【The invention's effect】
According to the hype hermetic tool of the present invention, the pipe is securely sealed by the elastic sealing member by including the housing having the anti-slip means and the elastic sealing member sandwiched between the housings. With respect to the gas pressure in the pipe, it is possible to prevent the housing from slipping out by the non-slip means of the housing.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention.
FIG. 4 is a view showing a conventional airtight tool for pipes.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Coupler 10a ... Screw part 10b ... Lever handle 10c ... Hole 11 ... Main body 11a ... Annular groove 11b, 14a ... Step part 12 ... Housing 12a ... Annular projection 12b ... Anti-slip means 13 ... Elastic sealing member 14 ... Pressing member 15 ... Pipe 16 ... Hinge pin 17 ... Screw 18, 19 ... O-ring

Claims (3)

A detachable pipe airtight tool that is attached to the end of a pipe and seals its opening, and comprises a main body having a coupler, a housing, an elastic sealing member, and a pressing member.
The body, an annular groove formed in and the outer periphery has substantially the same outer diameter as the outer diameter of the pipe to be sealed, the center of the main body rotatably supported to the hole is provided with the coupler, pores may The threaded part of the coupler is inserted,
The housing has an annular shape having an inner diameter that is substantially the same as the outer diameter of the pipe to be sealed, and is divided into two parts, hinged at one end, and provided with fastening means at the other end. The inner diameter of the housing is provided with an annular protrusion that engages with the annular groove of the main body, and anti-slip means that contacts the outer periphery of the pipe to be sealed,
The elastic sealing member is formed of a material having elasticity, has a ring shape that can be inserted into the inner diameter of the pipe to be sealed,
A female screw that is screwed into the threaded portion of the coupler is formed at the center of the pressing member, and the pressing member sandwiches the elastic sealing member between the main body and the coupler inserted through the main body. The elastic sealing member is pressed by a pressing means using a screw and expanded in the radial direction so that the pipe can be sealed, and air or gas can be fed into the pipe to be sealed by the coupler. Airtight tool for pipes.   The airtight tool for pipes according to claim 1, wherein the elastic sealing member has a mountain shape or an arc shape whose cross section swells outward.   2. The airtight tool for pipes according to claim 1, wherein the coupler is provided with a lever handle perpendicular to the axial direction thereof.

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