JPH0882570A - Gas leak monitor device of lamp outer/inner pipe - Google Patents

Abstract

PURPOSE: To provide a gas leak monitor device capable of simply detecting the gas leak of a lamp outer/inner pipe. CONSTITUTION: The closure means such as a fluid bag 2 or a small-sized solenoid valve closing and opening the pipeline received in a gas pipe 1 is provided in the vicinity of the most upstream part of a lamp outer/inner pipe 1. Further, a control unit 6 controlling the opening and closing of the closure means through the transmission means such as a hose 4 or an electric wire passed through the gas pipe 1 and a pressure sensor 7 detecting the lowering of the pressure in the gas pipe 1 on the downstream side of the closure means are provided in a house gas meter 8 or in the vicinity thereof. Since the closure means is provided in the gas pipe 1, excavation construction or an underground protective box is not required and the closure means can be closed and opened by the remote control from the gas meter. By cutting off gas on an upstream side at the time of the breakage of the gas pipe, secondary disaster such as gas explosion can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting gas leakage in a so-called outer lamp tube from a supply tube to a gas meter of each dwelling unit.

[0002]

2. Description of the Related Art Generally, it is easy to detect a gas leak on the downstream side of a dwelling unit gas meter, but as shown in FIG.
It is difficult to detect a gas leak in the inner pipe from the supply pipe 10 branched from 2 to the dwelling unit gas meter 8, that is, the outer light inner pipe 1, and the portion where the gas leakage accident occurs occurs in the outer light inner pipe 1. ing. As a conventional gas leakage monitoring device for the outer lamp inner tube 1, an inlet portion of the outer lamp inner tube 1, that is, the supply pipe 10 is used.
Install a gas meter at the connection with and measure the gas flow rate at a time when the gas is considered not to be used (for example, at midnight), and if there is a flow rate above a certain value, it is determined that there is a leak in the lamp inner tube. I was trying to do it.

[0003]

However, in order to install the gas meter and its accessories at the entrance of the lamp inner tube, excavation work is required, and in addition, these devices are permanently installed thereafter. There was a problem in terms of cost, such as safety management for the storage and installation place of the protection box. The present invention eliminates these problems, without needing excavation work,
Provide a low-cost gas leak detection device that can detect gas leaks in the inner tube outside the lamp and that can automatically cut off gas supply even when a breakage accident occurs in the inner tube due to an earthquake, etc. That is the purpose.

[0005]

As shown in FIGS. 1 and 2, a gas leakage monitoring device according to the present invention is housed inside a gas pipe 1 near an entrance of an inner pipe 1 of a lamp to close a pipe line. -Providing a closing means such as a fluid bag 2 to be opened or a small gas cutoff valve 3, and a hose 4 which is passed through the gas pipe 1.
Alternatively, a control device 6 for closing / opening the above-mentioned closing means 2 and 3 via a transmission means such as an electric wire 5 and a pressure sensor 7 for detecting a pressure drop in the inner pipe 1 are provided in or near the dwelling unit gas meter 8. A gas leak is detected by a pressure drop in the pipe when the gas pipe is closed.

[0006]

In the leak detecting operation, as shown in FIG. 1, the working fluid such as air and water is sent to the fluid bag 2 provided near the inlet of the inner tube 1 of the lamp through the hose 4, and the fluid bag 2 is supplied. Is expanded until it comes into close contact with the pipe wall to seal the inside of the inner pipe 1, or as shown in FIG. By energizing, the inside of the inner pipe 1 is sealed, and the pressure inside the pipe is monitored by the pressure sensor 7 for a certain period of time. When the gas meter 8 detects the use of gas in the dwelling unit during the leak detection operation, the closing means 2 and 3 are immediately opened.

[0007]

FIG. 1 shows an embodiment of the present invention, in which a dwelling unit gas meter 8 is provided toward the vicinity of the entrance of the inner pipe from the tip of the outer lamp inner pipe 1, that is, the supply pipe 10 to the dwelling unit gas meter 8.
A hose 4 having a fluid bag 2 attached thereto is inserted from a branch portion 9 provided in the gas pipe 1 inside or in the vicinity thereof, and a control device 6 for inflating and deflating the fluid bag 2 is provided at a base end portion of the hose 4. And a pressure sensor 7 for detecting the pressure in the gas pipe 1 in the dwelling unit gas meter 8. Since the dwelling unit gas meter 8, which is usually called a "microcomputer meter", has a built-in pressure sensor 7 for detecting a decrease in gas pressure, it can also be used. The control device 6 inflates and contracts the control fluid bag 2 in response to a closing signal and a release signal from the microcomputer type dwelling unit gas meter 8. As shown in the figure, the air pump 11 and the exhaust valve 12 are operated by using air as a working fluid. It is simple to use, but tap water can be used as the working fluid, and it can be configured with a water supply valve and a drain valve. Reference numeral 13 is a case containing a control circuit and a battery. As a means for pushing the fluid bag 2, the rigidity of the hose 4 may be used.
You may use the steel wire 14 and steel strip as shown in FIG.

The fluid bag 4 is made of rubber or a flexible synthetic resin material having airtightness and is formed into an elongated bag shape.
A conical spring 15 attached to the tip of the hose 4 and also attached to the tip of the hose 4 protects the bag 2 from damage when the fluid bag 2 is inserted into the gas tube 1, and protects the tube wall after insertion. The position of the fluid bag 2 is fixed by being attached to the. Further, when the bag 2 is contracted, the bag 2 is pushed back into the conical spring 15 by the gas flow, so that there is no fear of obstructing the gas flow. Also, the hose 5 is inserted from the branch portion 9 of the gas pipe 1,
By the rigidity of the hose 4 itself or the steel wire 14, the fluid bag 2 is pushed until it reaches the vicinity of the connecting portion between the outer lamp inner tube 1 and the supply tube 10.

The gas leak detection operation is performed periodically (for example, once a day) by a program built in the control device 6 or the microcomputer meter 8, and the gas can be used for each dwelling unit at the time of operation. Set at a time when the nature is small. When the set time comes, first, the signal that the gas flow rate in the gas meter 1 is zero is received, the air pump 11 is operated, the fluid bag 2 is inflated, and the supply pipe 10 is inflated.
The gas inflow from the light to the inner tube 1 outside the lamp is blocked, and the time is measured for a fixed time (for example, 10 minutes). When the pressure sensor 7 in the gas meter 8 does not drop to a preset pressure within this fixed time, it is determined that there is no gas leak. When the pressure sensor 7 detects a gas leak, an alarm signal is issued, and when the amount of gas leak is large, the gas shutoff by the fluid bag 2 is continued to prevent a secondary disaster. Also, when the pressure sensor 7 detects a breakage accident of the inner tube of the lamp,
The fluid bag 2 can be closed to minimize damage.

FIG. 2 shows another embodiment of the present invention. As a closing means, a cylindrical bag 16 is attached to the outer circumference of a cylindrical gas cutoff valve 3 having an outer diameter smaller than the inner diameter of the gas pipe 1. The gas cutoff valve 3 and the tube wall are inserted by the control wire 5 of the gas cutoff valve 3 and the hose 4 for supplying the fluid to the cylindrical bag 16 through the gas pipe 1. The space is sealed. In the figure, 17 is an electromagnet coil, 18 is a plunger, 19 is a valve element, 20 is a valve seat, and the gas inlet 2 is provided on the upstream end surface of the cylindrical case of the shutoff valve 3.
1. A plurality of gas outlets 22 are provided on the circumferential side surface, and the gas inlet 19 is closed by energizing the electromagnet coil 17. When the gas shutoff valve 3 is inserted into the gas pipe 1 and fixed at a predetermined position, the gas shutoff valve 3 is fixed to the tip of the steel wire 14 or a steel strip having an arc-shaped cross section, and the gas shutoff valve 3 is attached to the housing unit gas meter 8 After being inserted from a branch portion 9 provided in the gas pipe 1 inside or in the vicinity thereof and pushed in to a predetermined length toward the upstream side, a working fluid, that is, a fluid such as air or water is press-fitted into the cylindrical bag 16. This cylindrical bag 1
Reference numeral 6 is for sealing between the gas shutoff valve 3 and the pipe wall, and it is not necessary to expand and then contract it. Therefore, for example, an elastic foam sealing agent such as polyurethane foam should be filled. Good. Further, in this embodiment, the gas shutoff valve 3
Although a solenoid valve was used as, various valve types can be used.

FIG. 3 shows still another embodiment of the present invention. As a closing means, a cylindrical bag 16 is attached to the outer periphery of a cylindrical motor 23 having an outer diameter smaller than the inner diameter of the gas pipe 1. , The motor 23 on the upstream end face of the motor 23
A sirocco-type blower 24 driven by is provided, and the gas in the pipe sucked from the gas inlet 21 is sent into the bag 16 through the ventilation pipe 25 to be inflated by the blower 24 to close the gas flow path. It is a thing. According to this configuration, the gas in the pipe is filled in the bag 16, so that it is safe even if the bag 16 is damaged. For example, the airbag is damaged and an explosive mixture is created. There is no. Also in this example, the steel wire 14 is used as the inserting means. Further, as shown in FIG. 4, the operation of providing the branch portion 9 in the existing pipe or inserting the closing means or the like, as shown in FIG.
If a transparent bag 30 having pipe insertion holes 28 at both ends of 7 and holes 29 for inserting a hand on both sides of the body is used, it can be easily performed without stopping gas. 3 in the figure
1 is a packing.

[0012]

As described above, according to the present invention, the insertion type closing means is provided near the entrance of the lamp inner tube, and the closing means is remotely controlled via the transmission means inserted through the gas pipe. Since it is designed to seal the inside of the pipe, it is easy to automate the detection of gas leaks and immediately interrupt the detection operation when using gas, and since it is possible to shut off the gas on the upstream side when the gas pipe is broken, There is an advantage that secondary disasters such as gas explosion can be prevented, and there is no need to secure a place to install instruments near the connection between the supply pipe and the inner pipe or to install a protective box in the ground. Since the gas pipe is exposed on the ground, you can insert the closing means, so no excavation work is required, and it can be easily applied to existing houses. Can be taken out for repair and inspection There is an advantage in that.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of an embodiment of the device of the present invention.

FIG. 2 is a sectional view of a main part of another embodiment of the device of the present invention.

FIG. 3A is a cross-sectional view of a main part of still another embodiment of the device of the present invention, and FIG. 3B is a perspective view of the same part.

FIG. 4 is a perspective view of a work tool suitable for installation work of the device of the present invention.

[Explanation of symbols]

 1 Light Outer Inner Tube or Gas Tube 2 Fluid Bag or Closing Means 3 Gas Cutoff Valve or Closing Means 4 Hose or Transmission Means 5 Control Wire or Transmission Means 6 Control Device 7 Pressure Sensor 8 Dwelling Unit Gas Meter 9 Branch 10 Supply Pipe 11 Air Pump 12 Exhaust valve 13 Control circuit / battery case 14 Steel wire or steel strip 15 Conical spring 16 Cylindrical bag 21 Gas inlet 23 Cylindrical motor 24 Blower

Claims (7)

[Claims] 1. A closure means for accommodating the inside of a gas pipe to close and open a pipeline is provided in the vicinity of the most upstream portion of the lamp inner tube, and the above-mentioned closure is provided via a transmission means passed through the gas tube. A control device for closing / opening the means and a pressure sensor for detecting a pressure drop in the gas pipe are provided in the dwelling unit gas meter or in the vicinity thereof so that a gas leak is detected by the pipe pressure drop when the gas pipe is closed. Gas leak monitoring device for outer and inner pipes. 2. The gas leak monitoring device for a lamp inner tube according to claim 1, wherein the closing means is immediately controlled to open when the dwelling unit gas meter or the pressure sensor detects the start of use of gas. 3. As a means for installing the closing means in the gas pipe, the closing means is attached to the tip of a steel wire or steel strip, and the upstream side is provided from a branch portion provided in the gas pipe in or near the dwelling unit gas meter. The gas leakage monitoring device for the inner tube of a lamp according to claim 1, wherein the steel wire or the like is inserted. 4. A fluid bag that expands / contracts in a gas pipe is used as the closing means, and a fluid bag is used as the transmitting means from a branch portion provided in the gas pipe in or near the dwelling unit gas meter toward an upstream side. 2. A gas leak monitoring device for a lamp inner tube according to claim 1, wherein a hose communicating with the lamp is inserted and a fluid is supplied and discharged through the hose to expand and contract the fluid bag to close the gas tube. . 5. A cylindrical gas cutoff valve having a cylindrical fluid bag mounted on the outer periphery is used as the closing means, and a control wire of the gas cutoff valve and a hose for supplying fluid to the fluid bag are provided in the gas pipe. 2. The gas leakage monitoring device for a lamp inner tube according to claim 1, wherein the gas shutoff valve and the tube wall are sealed by the bag inserted therethrough. 6. As the closing means, a cylindrical gas bag is mounted on the outer periphery of a cylindrical motor having an outer diameter smaller than the inner diameter of the gas pipe, and the motor is driven on the upstream end surface of the motor. By providing a small blower, by blowing gas into the gas bag by the blower to inflate,
The gas leakage monitoring device for an inner tube of a lamp according to claim 1, wherein the gas tube is closed. 7. The pressure sensor or the dwelling unit gas meter detects the release of raw gas in the dwelling unit, forgetting to turn off the gas equipment, or the breakage accident of the lamp inner tube, and closes the closing means. Item 1. A gas leak monitoring device for an inner tube of a lamp according to Item 1.