JPH0221078A - Air discharge device - Google Patents

Abstract

PURPOSE:To conduct easily the regulation and handling of the work of air discharge, by providing at the insertion-attachment portion of a sealing up plug a connecting hole which connects the end portion of the interior side of a pipe passage to a side portion where a male screw is formed. CONSTITUTION:A sealing up plug 10 which is insert-attached within an air hole 15 connecting the interior of a pipe passage to the exterior thereof, is provided. This sealing up plug 10 is made up of a flange portion 11 which come into contact strikingly with the outside end portion perimeter line of the air hole 15 through a sealing ring 18, and an insertion-attachment portion 13 where a cylindrical male screw portion 13a which is fixed at this flange portion and is engaged with the cylindrical female screw portion 15a of the air hole 15, is formed. A connecting hole 17 which connects the end portion of the interior side of a pipe passage to a side surface where the male screw portion 13a is formed, is provided at the insertion-attachment portion 13. When the sealing up plug 10 is loosened a little, pressure within the pipe passage is discharged to the exterior via the connecting hole 17.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an air vent device installed at a stopper at the end of a water pipe, and particularly relates to an air vent device that is easy to adjust and has a high degree of safety. Regarding extraction equipment.

(Prior Art) Recently, roads in urban areas have been affected by urbanization, and it has become extremely difficult to bury water pipes and other buried objects in designated road-occupied positions.

For this reason, there are many cases in which the installation of water pipes has to be stopped for a short or long period of time during the installation of water pipes.

In such cases, temporarily install a stopper at the end of the water pipe,
Water is passed to this stopper to provide relief to the user.

In addition, when restarting the installation work, the air inside the water pipe is removed using an air vent device installed in the stopper, and then the stopper is removed and the installation work is restarted.

A conventional stopper and air vent device will be explained with reference to FIGS. 4 and 5.

As shown in FIGS. 4 and 5, a plug 20 is installed at an end socket 25 of a water pipe that is currently being installed. Both the end socket 25 and the plug 20 are made of cast iron (FCD), and the plug 20 is fixed to the end socket 25 with a plurality of single-head bolt nuts 23. In addition, the plug 20 and the end socket 2
A rubber ring 24 (made of SBR) is interposed between the end socket 25 and the stopper 20 to supply water.

Further, the stopper 20 is formed with a plurality of air vent holes 15, for example, two air vent holes 15, which communicate the inside and outside of the water pipe.

A sealing plug 29 is inserted into the air vent hole 15 with a seal tape (not shown) wrapped around it to form an air vent device.

The air vent hole 15 has a tapered shape such that its inner diameter gradually decreases toward the inside, and a female thread 15a is formed on the inner peripheral surface of the air vent hole 15. On the other hand, the sealing plug 29 also has a tapered shape corresponding to the air vent hole 15, and a male thread 29a that engages with the female thread 15a of the air vent hole is formed on the outer peripheral surface of the sealing plug 29.

In this way, by forming the air vent hole 15 and the sealing plug 29 into a tapered shape, the watertightness of the sealing plug 29 can be improved.

Note that a tool engaging portion 28 is attached to the outside of the sealing plug 29.

(Problems to be Solved by the Invention) When the stopper 20 is removed from the end socket 25 of the water pipe as described above, the air inside the water pipe is vented using an air venting device.

This air venting work involves loosening the sealing plug 29 by engaging a suitable tool, such as a spanner, with the tool engaging portion 28, and then tightening the female thread 15a of the air vent hole 15 and the male thread 29a of the sealing plug 29.
Air is being removed from between the

However, since the air vent hole 15 and the sealing plug 29 have a tapered shape, if the sealing plug 29 is loosened significantly, the sealing plug 29 may suddenly come out. On the other hand, if the sealing plaque 29 is loosened to a small extent, it will take a long time to bleed the air.

As described above, it is difficult to adjust the conventional air purge operation.

Therefore, if the operator is inexperienced, the plug 20 may be removed before sufficient air is removed. If the operator removes the plug while the residual pressure inside the water pipe is high, the plug 20 may pop out, creating a very dangerous situation. was.

Furthermore, the sealing plug 29 is tightly tightened and inserted into the air vent hole 15 with a sealing tape wrapped around it, but for this reason, a large torque is required to loosen the sealing plug 29. Furthermore, it has been reported that when the sealing plug 29 is re-inserted into the air vent hole 15, the sealing plug 29 must be cleaned and the sealing tape re-wrapped and re-inserted.

The present invention has been made in consideration of these points,
It is an object of the present invention to provide an air purge device that is easy to adjust and handle for air purge work and is highly safe.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a sealing plug that is inserted into an air hole that communicates the inside and outside of a conduit, and the sealing plug has a seal ring attached to an outer edge of the air hole. It consists of a flange portion that abuts through the flange portion, and an insertion portion that is fixed to the flange portion and has a cylindrical male threaded portion that engages with the cylindrical female threaded portion of the air vent hole. This air venting device is characterized in that a communication hole is provided that communicates the inner end of the pipe with the side surface on which the male thread is formed.

(Function) According to the present invention, when the sealing plaque is slightly loosened, the pressure inside the conduit is reduced between the female threaded part of the air vent hole and the male threaded part of the insertion part, and at the outer end of the air vent hole. The pressure inside the pipe is discharged to the outside through the space between the peripheral edge of the part and the flange part, and when the insertion part is further loosened and the communication hole of the insertion part is exposed to the outside, the pressure inside the pipe is discharged to the outside through this communication hole.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 3 are diagrams showing an embodiment of an air venting device according to the present invention.

Note that the same reference numerals are given to the same members as in the prior art, and detailed description thereof will be omitted.

In FIGS. 2 and 3, a plug 20 is installed at an end socket 25 of a water pipe that is currently being installed.

The plug 20 is fixed to the end socket 25 with a plurality of single-headed bolts and nuts 23, and a rubber ring 24 is interposed between the plug 20 and the end socket 25.

Moreover, two air vent holes 15 are formed in the stopper 20 to communicate the inside and outside of the water pipe.

The air venting device according to the present invention is constructed by inserting a sealing plug 10 into an air venting hole 15 of a stopper 20.

Next, the air venting device will be explained in detail with reference to FIG.

As shown in FIG. 1, a female threaded portion 15a is formed on the cylindrical inner peripheral surface of the air vent hole 15 of the plug 20. As shown in FIG.

On the other hand, the sealing plug 10 has an outer edge 2 of the air vent hole 15.
It is composed of a flange portion 11 that abuts on the flange portion 0a, and an insertion portion 13 that is fixed to the flange portion 11. This insertion portion 13 is formed with a cylindrical male threaded portion 13a that engages with a female threaded portion 15a of the air vent hole 15. Further, a tool engaging portion 12 is attached to the outside of the flange portion 11.

Furthermore, the insertion portion 13 is provided with a communication hole 17 that communicates between the end 16 on the inner side of the conduit (the end opposite to the flange portion 11) and the side surface on which the male thread portion 13a is formed. This communication hole 17 includes an axial communication hole 17a extending from the end 16 of the insertion portion 13 on the inside side of the conduit toward the flange portion 11 side, and a side surface male threaded portion 13a of the insertion portion 13 and the axial communication hole 17a. and a radial communication hole 17b that communicates with the radial direction.

Further, the flange portion 11 is provided with a seal ring 18 (S
(manufactured by BR) is installed.

Note that the flange portion 11 of the sealing bolt 10 and the tool engaging portion 1
2 and the insertion portion 13 are both made of 5U3403.

Next, the operation of this embodiment having such a configuration will be explained.

When the stopper 20 is installed in the end socket 25 of a water pipe during installation work, the sealing plug 10 is firmly tightened and inserted into the air vent hole 15 of the stopper 20 (Fig. 1(a)). ).

Subsequently, when removing air from the water pipe in order to remove the stopper 20, a wrench is engaged with the tool engaging portion 12 to loosen the sealing plug 10, as shown in FIG. 1(b). In this case, the seal ring 18 attached to the flange portion 11 separates from the outer edge 20a of the air vent hole 15, and the residual pressure inside the water pipe is released between the female threaded portion 15a of the air vent hole 15 and the insertion portion 13.
The air is discharged to the outside through between the external threaded portion 13a of the air vent hole and between the outer end peripheral edge 20a of the air vent hole and the flange portion 11. The discharge status of this residual pressure can be confirmed by applying soapy water to the vicinity of the flange portion 11. In this state, the radial communication holes 1, 7b of the insertion portion 13 are still located within the air vent hole 15.

When the sealing plug 10 is further loosened, the radial communication hole 17b of the insertion portion 13 is connected to the air vent hole 1 as shown in FIG. 1(C).
5.Exposed from inside to outside. At this time, the residual pressure inside the water pipe is discharged to the outside through the axial communication hole 17a and the radial communication hole 17b of the insertion portion 13.

In this case, the discharge amount of the residual pressure inside the water pipe can be adjusted by changing the exposure state by exposing all or part of the radial communication hole 17b to the outside.

As explained above, according to this embodiment, the sealing plug 10
By gradually loosening the opening and changing the exposure state of the radial communication hole 17b, the discharge amount of the residual pressure inside the water pipe can be adjusted over a wide range. Furthermore, since both the female threaded portion 15a of the air vent hole 15 and the male threaded portion 13a of the insertion portion 13 have a cylindrical shape, the engagement length between the female threaded portion 15a and the male threaded portion 13a is made long. be able to. Therefore, when the sealing plug 10 is loosened, the sealing plug 10 does not release air. Further, since the seal ring 18 of the flange portion 11 is brought into contact with the outer edge 20a of the air vent hole 15 to perform water purification, there is no need to wrap seal tape around the insertion portion 13. In addition, by making the sealing plug 10 from 5US403, the air vent hole 15 and the sealing plug 1
The sealing plug 10 can be easily handled by preventing rust from forming on the insertion portion 13 of the sealing plug 10.

In addition, in the above embodiment, an example was shown in which the air vent device was provided at the stopper 20 installed at the end socket 25 of the water pipe, but the air vent device is not limited to this, and the air vent device may be provided in the water pipe, etc. .

〔Effect of the invention〕

As explained above, according to the present invention, the female threaded portion of the air vent hole and the male threaded portion of the insertion portion are both cylindrical, so that the engagement length between the female threaded portion and the male threaded portion is increased. Therefore, when the sealing plug is loosened, air will not be released from the sealing plug, ensuring a high level of safety. Further, by loosening the sealing plug and changing the state of exposure of the communication hole to the outside, the amount of residual pressure discharged inside the pipe can be easily adjusted.

FIG.
Figures (a), (b), and (c) are diagrams showing details of the air vent device, Figure 2 is a side sectional view showing the state in which the air vent device is installed on the stopper, and Figure 3 is Figure 2 -■ line arrow view, Figure 4 is a side sectional view showing a state in which a conventional air vent device is installed on the stopper, Figure 5 is
The figure is a view taken along the line v-v in FIG. 4.

10...Sealing plug, 11...Flange part, 12.
...Tool engagement part, 13...Insertion part, 15...Air vent hole, 17...Communication hole, 18...Seal ring, 20
... Plug, 20a... Outer end periphery, 25... End socket of water pipe.

Claims (1)

[Claims] a sealing plug inserted into an air hole that communicates the inside and outside of the conduit, the sealing plug having a flange portion that abuts a peripheral edge of an outer end of the air hole via a seal ring;
The insertion part is fixed to the flange part and has a cylindrical male threaded part that engages with the cylindrical female threaded part of the air vent hole. An air vent device characterized by having a communication hole that communicates with a side surface on which a male thread is formed.