JP2001124300A - Gas leakage detecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leakage inspection system which can reduce a cost for inspection duties and can always monitor. SOLUTION: In this leakage detecting system in a pipe line to supply gas to a plurality of parts, an individual flow sensor 6 is arranged per each supply pipe line 4 to each part that gas is supplied to, an integrated flow sensor 5 is arranged in a main branch pipe 2 before the supply pipe line 4 is branched, and a control part 7 is provided to which flow information on the integrated flow sensor 5 and each individual flow sensor 6 are inputted. In the control part 7, no-leakage is discriminated in the case that the total sum of flow from the individual flow sensor 6 is matched with flow from the integrated flow sensor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leak detection system, and more particularly, to a system for detecting a leak in a gas supply path to a commercial consumer such as an apartment house.

[0002]

2. Description of the Related Art In existing gas pipes buried underground or the like, it can be inferred that gas leakage occurs due to odorous components contained in the gas. on the other hand,
For mains gas pipes, it is mandatory to conduct leak inspections regularly. Therefore, the following method has been adopted as a method for inspecting whether or not leakage has occurred in an existing piping system such as a gas pipe. For example, there is a method in which pilot holes are drilled at a plurality of places on the ground along the laying direction of existing pipes, and a concentration sensor is arranged in the pilot holes to detect a gas concentration in the pilot holes to specify a leak position. is there. As another method, there is a method in which a bogie equipped with a leak detector is moved on the ground in a section where a buried pipe is laid, and the presence of a leaking gas is detected by component analysis using the leak detector.

On the other hand, there is a case where leakage detection is performed for a commercial consumer who is a mass consumer such as an apartment house or a building. In this case, for example, as shown in FIG. The gas leak detector 11 is attached to the supply pipe 10 installed in the house, or the presence or absence of a leak is inspected by a leak detector brought by an inspector dispatched to each house. Further, as described above, the worker P moves the trolley 13 on which the leak detector 12 is mounted, and performs a gas leak test on the pipeline 14 before reaching the supply pipe 10.

[0004]

In the above-mentioned commercial customers, regular leak inspections are required,
At the time of inspection, inspection by human tactics is required, which increases personnel costs. In addition, when a gas leak detector is installed in each house, there is a problem that the inspection cost increases in addition to the equipment and the personnel cost described above. In addition, although periodic inspections are often performed as described above, in reality, it is not always possible to always monitor for leakage at the time of non-inspection, and it is not possible to perform instantaneous leakage detection by constant monitoring. There are some defects.

It is an object of the present invention to provide a leak inspection system that can reduce the cost of inspection work and constantly monitor, in view of the above problems in the conventional leak inspection system.

[0006]

In order to achieve this object, an invention according to claim 1 is a leak detection system in a gas supply pipe to a plurality of locations, wherein the leak detection system is provided for each of the supply pipes to the supply destination. A separate flow sensor is installed and an integrated flow sensor is installed in a pipe before the supply pipe is branched, and a control unit is provided to which the integrated flow sensor and the flow rate information for each individual flow sensor are input. The control unit is characterized in that when the total flow rate from the individual flow sensors matches the flow rate from the integrated flow sensor, it is determined that there is no leakage.

According to a second aspect of the present invention, the control section registers the flow rate in the pipe before the supply pipe is branched in advance and sets the flow rate in the pipe to a specified value. It is characterized in that an alarm is issued when the sum of the flow values from the flow sensors does not match.

[0008]

According to the first aspect of the present invention, the simple processing of simply comparing the total flow rate from the individual flow sensors to the flow rate at the centralized flow sensor capable of detecting the total amount of gas flowing in the supply pipe is achieved. Leakage in the supply line can be detected. This makes it possible to perform leak inspection by centralized management without requiring inspection personnel.

According to the second aspect of the present invention, an alarm can be issued when the total flow rate from the individual flow sensors does not match the flow rate at the integrated flow sensor, which is the specified value, so that the individual flow for the specified value can be performed regardless of inspection personnel. A change in the flow rate at the sensor can be constantly monitored, and a necessary alarm can be issued.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a configuration diagram of a gas leak detection system according to an embodiment of the present invention. The gas leak detection system according to the present embodiment is intended for a commercial customer 1 such as an apartment house or a building. In the building, a plurality of pipelines from the main pipe 2 via a shutoff valve 3 are provided. It is branched and connected to each house as a supply pipe 4.

In front of the shutoff valve 3 in the main pipe 2, an integrated flow sensor 5 capable of detecting the flow rate of gas flowing in the main pipe 2 is provided. On the other hand, the supply pipe 4 branched from the main pipe 2 is provided with an individual flow sensor 6 capable of detecting the gas flow rate with each supply pipe.

The integrated flow sensor 5 and the individual flow sensors 6 output flow rate information to a control unit 7 described later. Here, for example, data from the flow sensor 6 is transmitted to the control unit 7 by radio. The control unit 7 includes a microcomputer (not shown) whose main part is constituted by a microcomputer, and the above-mentioned integrated flow sensor 5 is provided on the input side via an I / O interface (not shown).
And an individual flow sensor 6 are connected, and on the output side,
The alarm means 8 and the shutoff valve 3 are connected. The members connected to the input / output side are analog
They are connected via digital conversion means.

The control unit 7 detects leakage by comparing the total flow rate of the gas flowing through the supply pipe 4 with the flow rate of the gas flowing through the main pipe 2. That is, when the flow rate at the integrated flow sensor 5 is A and the flow rates at the individual flow sensors 6 are a, b, and c, A = a + b +
When the relationship of c is obtained, it is determined that there is no leakage. Therefore, if the above equation is not obtained, it is determined that a leak has occurred and a warning is issued.

On the other hand, in addition to discrimination of the leak based on the above equation, the control unit 7 closes the shut-off valve 3 so as to prevent the leak from inadvertently expanding when the leak occurs. That is, when the flow rate of the gas flowing into the main pipe is registered in advance and set as a specified value, and the sum of the gas flow rates of the individual flow sensors 6 does not match the specified value,
An alarm is issued and the shutoff valve 3 is closed. This allows
Since the supply of the gas flowing from the position of the shut-off valve 3 to the individual supply pipes 4 is interrupted, it is possible to prevent the gas leakage in the supply pipe line 4 from expanding. On the other hand, when the flow rate information from the individual flow sensor 6 does not match the specified value, it is possible to warn that a leak has occurred, so that it is possible to constantly monitor until this state is obtained. If a leak occurs, a warning can be taken to take quick measures. In addition, as a process in the case where the sum of the flow rates from the individual flow sensors does not match the specified value, the alarm means 8 is provided with a wireless function, and information in the event of a leak is wirelessly transmitted to a central control center or the like. Is also possible. This makes it possible for the central control sensor to constantly monitor the leak detection in the supply pipe 3.

[0015]

According to the first aspect of the present invention, it is possible to simply compare the total amount of the flow from the individual flow sensors with the total amount of the flows from the integrated flow sensors capable of detecting the total amount of the gas flowing in the supply line. With such a process, it is possible to detect a leak in the supply pipeline. This makes it possible to perform leak inspection by centralized management without requiring inspection personnel. As a result, it is not necessary to monitor by inspection personnel only by providing a control unit capable of performing operation comparison, so that inspection at each house is not required and personnel costs can be reduced.

According to the second aspect of the present invention, an alarm can be issued when the total flow rate from the individual flow sensors does not match the flow rate at the integrated flow sensor, which is the specified value, so that the specified value can be satisfied regardless of the inspection personnel. It is possible to constantly monitor a change in the flow rate by the individual flow sensor and issue a necessary alarm. It is possible to set up a system to constantly monitor gas leaks without sending inspection personnel.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a configuration of a gas leakage inspection system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a conventional inspection system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Building of a commercial customer provided with the piping structure which branches several supply pipes 2 Main branch pipe equivalent to the pipeline located before the supply pipe to a commercial customer branches 3 Shut-off valve 4 Commercial customer Supply pipe branched first 5 Integrated flow sensor installed on the main pipe side 6 Individual flow sensor installed on the supply pipe side 7 Control unit 8 Alarm means

Claims (2)

[Claims] 1. A leak detection system in a gas supply line to a plurality of locations, wherein a separate flow sensor is provided for each of the supply lines to the supply destination, and a book before the supply line is branched. An integrated flow sensor is installed in the branch pipe, and a control unit is provided for inputting the flow information for each of the integrated flow sensor and the individual flow sensor. In the control unit, the total amount of flow from the individual flow sensor is integrated into the integrated flow sensor. A gas leak detection system that determines that there is no leak when the flow rate matches a flow rate from a flow sensor. 2. The control unit according to claim 1, wherein the flow rate in the pipe before the supply pipe is branched is registered in advance and set as a specified value.
2. The gas leak detection system according to claim 1, wherein an alarm is issued when the total of the flow values from the individual flow sensors does not match the specified value.