JP2001324035A - Auxiliary device for air supply to and discharge from gas bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary device for air supply to and discharge from a gas bag, capable of supplying air to and discharging air from a gas bag in a short period of time and with ease. SOLUTION: The auxiliary device for air supply to and discharge from air bag is a device for supplying and discharging air by using a compressor to a gas bag to shut off gas by arranging and expanding it in a gas pipe and integrating an air supply pipe 10 furnished with a regulator 2 which is a pressure regulator and an air discharge pipe furnished with an ejector 4 which is a suction negative pressure generating device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary device for supplying and discharging air to and from a gas bag for shutting off gas in a gas pipe by gas construction or the like, and more particularly to a gas bag air supply and discharge using a compressor. It relates to an auxiliary device.

[0002]

2. Description of the Related Art For example, when replacing a part of an existing gas pipe disposed underground or providing a new branch pipe, the gas in the construction section is temporarily stopped to perform the work. Sometimes you want to. At this time, gas bags for shutting off gas are used at two places on both sides of the construction section. Generally, a gas bag is a type of air bag formed of a flexible and well-sealed material such as a rubberized cloth, and is put in a gas pipe and supplied with air to inflate the outer surface of the gas bag. The gas pipe is closed so as to be in close contact with the entire inner circumference of the pipe. Here, FIG. 2 is an explanatory diagram showing a method of using the gas bag 60.

[0003] When performing gas work or the like, first, the gas pipe is exposed, a hole 51 for a gas bag is opened, and the deflated gas bag 60 is inserted into the gas pipe. A tube 61 is attached to the gas bag 60, and a manual pump is connected to the tube 61 to supply air and inflate the gas bag 60 to close the gas pipe 50 at that point. By arranging and inflating such gas bags 60 on both sides of the construction section, the flow of gas in that section is cut off.

Next, gas remaining in the gas pipe closed by the two gas bags 60 is discharged. For this, a compressor is used. Therefore, two holes are opened in the gas pipe at the portion closed by the two gas bags 60, and the compressed air of the compressor is blown from one side to discharge the gas from the other, thereby replacing the residual gas inside the gas pipe with air. . This prevents gas leakage even when the gas pipe between the gas bags 60 is cut. In such a construction method, the gas can be cut off only in a necessary section by using the gas bag 60, so that the influence of the gas cut-off and the like in a portion other than the construction section is minimized.

After the construction of the gas pipe is completed, the air in the gas bag is exhausted and deflated, and the gas bag is taken out of the gas pipe and stored. Finally, the gas bag holes are closed and the ground is backfilled to complete the entire construction.

[0006]

By the way, in the above-mentioned conventional gas bag, when supplying air, a manual pump is connected to the tube 61 to supply the air manually. Had to manually push out the air. However, since the tube 61 is relatively thin so that air does not escape during work and the gas bag does not easily collapse, the tube 61 is used.
1, the pressure loss during the supply and discharge of air to and from the gas bag performed through the airbag 1 was large, and the work of supplying and discharging the air from the gas bag was a considerable labor. Such work was also time-consuming.

[0007] Especially when the diameter of the gas pipe is large, a large gas bag is used, and furthermore, it takes a lot of labor and takes much time. In the case of a large-diameter gas pipe, it takes about 10 minutes to supply air to one gas bag, and in some cases, it takes much more time to discharge air.
These operations are not only burdensome for the workers, but also prolong the gas shut-off time and road cut-off time due to the construction. In addition, when air is supplied manually, there is a danger that the gas supply may be incomplete due to insufficient air supply, or the gas bag may be damaged due to excessive air supply. Means for supplying and discharging air have been eagerly desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas bag air supply / discharge auxiliary device for easily supplying / discharging air to / from a gas bag in a short time. It is in.

[0009]

SUMMARY OF THE INVENTION A gas bag air supply / discharge auxiliary device of the present invention is a device for supplying and discharging air to a gas bag which is disposed in a gas pipe and inflates to shut off gas by using a compressor. And an air supply pipe provided with a regulator as a pressure regulator and an air discharge pipe provided with an ejector as a suction negative pressure generator.

Therefore, according to the gas bag air supply / discharge auxiliary device of the present invention, when air is supplied to the gas bag, the compressor and the gas bag are connected to both ends of the air supply pipe, and the compressed air of the compressor is supplied. The pressure is reduced by the regulator and supplied to the gas bag. When discharging air from the gas bag, a compressor and a gas bag are connected to both ends of the air discharge pipe. By connecting the gas bag to the suction side of the ejector, the air in the gas bag is sucked and forcibly discharged. This makes it possible to use the gas bag air supply / discharge auxiliary device and the compressor of the present invention instead of the manual pump, and to easily supply and discharge air to the gas bag in a short time.

Further, the gas bag air supply / discharge auxiliary device of the present invention is characterized in that the regulator has a shut-off function of automatically stopping the air supply when the secondary side reaches a set pressure. . Therefore, according to the gas bag air supply / discharge auxiliary device of the present invention, by setting the supply pressure by the regulator at the time of air supply, the air supply is automatically stopped when the pressure inside the gas bag reaches the set pressure, and the compressor is used. Even if air is supplied to the gas bag in such a manner, the gas bag is not damaged due to excessive supply, or the gas bag does not expand insufficiently due to insufficient air supply, and an appropriate amount of air can be supplied.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying a gas bag air supply / discharge auxiliary device of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram illustrating a gas bag air supply / discharge auxiliary device according to the present embodiment.

As shown in FIG. 1, a gas bag air supply / discharge auxiliary device 1 includes an air supply pipe 10 provided with a regulator 2 and a pressure gauge 3 and an air discharge pipe 20 provided with an ejector 4.
Consists of The regulator 2 is a small pressure regulator for air. The regulator 2 decompresses the compressed air input from the input port 11 and outputs it to the output port 12 side. When the secondary pressure exceeds a preset pressure, the air supply is stopped. It has a shut-off function. The ejector 4 is a suction negative pressure generating jig that generates a negative pressure by a small amount of jet airflow and induces a large amount of secondary air to suck the gas, and uses the compressed air flowing from the input port 21 side as a jet airflow. Air is ejected from the discharge port 23, air is sucked from the suction port 22 side by the generated negative pressure, and the air is discharged from the discharge port 23. The pressure gauge 3 is provided with a secondary pressure of the regulator 2,
That is, the air pressure in the gas bag can be checked by an operator.

The air supply pipe 10 has the regulator 2 and the pressure gauge 3 arranged in this order, the input port 11 of which is connected to a compressor via a control valve (not shown), and the output port 12 of which is connected to a gas bag tube 61.
(See FIG. 2). On the other hand, the ejector 4 is connected and the air discharge pipe 20 has an input port 21 connected to a compressor via a control valve (not shown), and a suction port 22 connected to a gas bag tube 61 (see FIG. 2). The discharge port 23 of the ejector 4 is open to the atmosphere.

Next, supply and exhaust of gas to and from a gas bag using the gas bag air supply / discharge auxiliary device 1 of the present embodiment will be described. First, as in the prior art, as shown in FIG. 2, a hole 51 for inserting the gas bag 60 into the gas pipe 50 at a position where the gas is to be cut off is opened, and the deflated gas bag 60 is inserted into the gas pipe 50. I do. Gas bag 6
A tube 61 for supplying and discharging air is connected to 0, and the tube 61 extends from a gas bag 60 inserted into the gas pipe 50 to the outside. Therefore, when supplying air, the air supply pipe 10 side of the gas bag air supply / discharge auxiliary device 1 is used, and the compressor is connected to the input port 11 and the tube 61 of the gas bag 60 is connected to the output port 12. At this time, a compressor used to replace the gas in the gas cutoff section with air is used.

The regulator 2 is set to perform pressure adjustment appropriate for inflating the gas bag 60.
Therefore, the compressed air from the compressor is supplied to the air supply pipe 1
0, the input port 11
Compressed air input from is output to the output port 12 after being reduced to a set pressure value. The output air is supplied to the gas bag 60 via the pressure gauge 3 and the tube 61. Then, the air is sufficiently supplied to the gas bag 60,
The outer surface is in close contact with the inner peripheral surface of the gas pipe 50. The pressure gradually increases in the gas bag 60, and when the pressure exceeds the set pressure of the regulator 2, the supply of air is stopped by the shutoff function. During this time, the operator can check the air pressure in the gas bag with the pressure gauge 3.

Thereafter, the control valve connected to the input port 11 is closed, the compressor is further stopped, and the opening of the tube 61 is disconnected from the air supply pipe 10 so as to prevent air leakage. Complete the air supply. The gas bag 60 thus attached
The gasket 50 has its outer peripheral surface in close contact with the inner peripheral surface of the gas pipe 50 for sealing, thereby blocking gas flow. As shown in FIG. 2, by arranging the gas bag 60 on the upstream side of the hole 51 in the gas flow direction (arrow in the figure), gas leakage from the hole 51 does not occur.

Subsequently, after the construction of the gas pipe 50 is completed, the air in the gas bag 60 is discharged and taken out of the gas pipe 50. For this purpose, the compressor is connected to the input port 21 of the air discharge pipe 20, and the tube 61 of the gas bag 60 is connected to the suction port 22. Then, the compressed air of the compressor is sent to the ejector 4 to generate jet air, and the air in the gas bag 60 is forcibly sucked and exhausted from the exhaust port 23. Then, when the air in the gas bag 60 can be exhausted, the compressor is stopped, and the gas bag 60 is extracted from the gas pipe 50.

Therefore, as described above, according to the gas bag air supply / discharge auxiliary device 1 of the present embodiment, the supply operation time conventionally required by a manual pump for about 10 minutes is reduced to about 2 minutes. It was possible to reduce the time required for air discharge from about 10 minutes to about 2 minutes. By properly setting the pressure value on the output side of the regulator 2, there is no danger of gas leakage due to insufficient air supply to the gas bag 60 or damage to the gas bag 60 due to excessive air supply.
0 can be supplied with air. Also,
The compressor is conventionally used for replacing the air in the gas pipe 50 and does not require a new device. Therefore, the cost required for the operation is small and the compressor can be easily implemented. Therefore, it can be provided at a low cost.

It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with modifications without departing from the spirit of the invention.

[0021]

According to the present invention, there is provided a device for supplying and discharging air to a gas bag, which is arranged in a gas pipe and inflated to shut off gas, by using a compressor, wherein the air is provided with a regulator which is a pressure regulator. Since the supply pipe and the air discharge pipe equipped with an ejector that is a suction negative pressure generator are integrated, a gas bag air supply / discharge auxiliary device that supplies and discharges air to and from the gas bag in a short time and easily is provided. We were able to.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a gas bag air supply / discharge auxiliary device.

FIG. 2 is an explanatory diagram illustrating a method of using a gas bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas bag air supply and discharge auxiliary device 2 Regulator 3 Pressure gauge 4 Ejector 10 Air supply pipe 20 Air discharge pipe 60 Gas bag

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H045 AA12 AA26 BA20 BA31 CA03 DA15 EA34 3H076 AA40 BB41 BB43 BB50 CC99 4G068 AA10 AB01 AC20 AD37 AD40 AD50 AE10 AF28 AF37 AF40

Claims (2)

[Claims] 1. A device for supplying and discharging air using a compressor to a gas bag, which is arranged in a gas pipe and inflated to shut off gas, comprising: an air supply pipe having a regulator as a pressure regulator;
A gas bag air supply / discharge auxiliary device, wherein an air discharge pipe having an ejector, which is a suction negative pressure generating device, is integrated. 2. The gas bag air supply and discharge auxiliary device according to claim 1, wherein the regulator has a shutoff function of automatically stopping air supply when the secondary side reaches a set pressure. Characteristic gas bag air supply and discharge auxiliary device.