JP4516171B2 - Gas micro delivery amount check system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas minute delivery amount check system used to detect the presence or absence of gas leakage from a gas conduit of a gas supply facility in a specific manufacturing facility of a simple gas business.
[0002]
[Prior art and problems to be solved]
Large gas meters are generally installed in gas supply facilities such as factories in the simple gas business, and the amount of gas used (integrated amount) is measured. Therefore, even if a small amount of gas leaks from a gas supply conduit or the like, a large gas meter cannot accurately measure a minute delivery gas. Can not.
[0003]
In view of this point, an object of the present invention is to propose a minute gas delivery amount check system that can accurately determine minute gas leakage from a gas conduit or the like.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is a gas micro-delivery amount check system used for detecting the presence or absence of gas leakage in a gas supply path, in which gas is normally supplied through a normal gas meter for rate transactions. A gas supply path, the normal gas meter, a leak detection gas supply path for flowing gas through a leak detection gas meter having higher detection sensitivity than the normal gas meter, and a gas supply path as the normal gas supply path and the leak Supply path switching means for switching to any one of the gas supply paths is provided.
[0005]
In the system of the present invention, when the gas supply path is switched from the normal gas supply path to the leakage gas supply path by the supply path switching means, the gas flows through the leak detection gas meter having high detection sensitivity. Therefore, even when a very small amount of gas leakage occurs in the gas conduit or the like, it can be detected with high accuracy.
[0006]
Here, the supply path switching means is configured to switch the gas supply path to the leak detection gas supply path during a preset time zone. For example, it is constituted by a timer switch or the like. The time zone can also be changed. In general, this time zone is desirably a midnight time zone in which there is almost no gas consumption, and can be, for example, between 2 o'clock and 3 o'clock at midnight.
[0007]
Here, when the supply path switching means does not operate normally, for example, when the gas supply path is switched to a path that flows through the leakage gas meter in a time zone in which the amount of gas used is large, the leakage detection gas meter is small. However, since a large flow rate gas cannot be flowed, if a large flow rate gas is flowed, the pressure loss increases and adversely affects the combustion of the gas equipment and the like. In order to avoid such an adverse effect, the gas fine delivery amount check system of the present invention includes the normal gas supply in addition to the normal gas supply path, the leak detection gas supply path, and the supply path switching means. It is the parallel-connected abnormal gas supply path relative to the road and leak detection gas supply passage, characterized by having a the malfunction-time for abnormality is connected to the gas supply channel meter .
[0008]
In this case, adjusting means for switching the gas supply path to the abnormal gas supply path is installed based on a pressure difference between the normal gas supply path and the leakage detection gas supply path and the abnormal gas supply path. do it.
[0009]
Next, if the gas meter is configured so that the meter can be read in response to a request from the management center via a communication line, it is convenient because it is not necessary to go to the place where the gas meter is installed. For this purpose, in order to perform meter reading of the leak detection gas meter on the management center side via a communication line, a transmission device capable of transmitting the measurement value of the leak detection gas meter in response to a request from the management center is provided. What is necessary is just to have the structure which has.
[0010]
If the transmission device is communicable via a portable mobile telephone network such as a PHS network, it is convenient because the meter can be read by communication even in a place where there is no general telephone line.
[0011]
On the other hand, the management center connected via the communication line compares the gas flow integrated value of the leak detection gas meter with a predetermined determination value to determine whether there is a gas leak in the gas supply path. Judgment can be made.
[0012]
Here, in an apartment house or the like, as a gas meter, a parent meter and each door meter are connected to a gas supply path. The present invention can also be applied to such a gas supply system. In this case, if the normal gas meter (parent meter) and each door gas meter can be metered by the management center via the transmission device or a separate transmission device, the management center side can use the normal gas meter and each door gas meter at the same time. By the meter reading, it is also possible to compare the integrated value of the normal gas meter and the total integrated value of the individual gas meters to determine the presence or absence of gas leakage.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a midnight gas micro delivery amount check system to which the present invention is applied will be described with reference to the drawings.
[0014]
FIG. 1 shows an example in which the midnight gas micro-delivery amount check system according to the present invention is applied to a gas supply system in a factory of a simple gas business. The midnight gas micro delivery amount check system 1 of this example includes a management center 2, a gas supply system 3 installed in a factory of each simple gas business, and a mobile phone network such as a PHS network connecting them. 4 is composed of an ISDN communication line 5 via 4.
[0015]
The gas supply system 3 has two sets of LP gas supply sources 11 and 12, and each of the gas supply sources 11 and 12 includes a plurality of LP gas containers 13. The gas supply pipes 14 and 15 for supplying gas from the gas supply sources 11 and 12 merge via the automatic switching devices 16 and 17, respectively, and then branch again into two branches.
[0016]
One branch pipe 18 of the first and second branch pipes 18 and 28 is connected to an inlet port of an actuator valve 21 which is a two-way switching valve via a first LP gas pressure regulator 19 and a valve 20. Has been. The first outlet port 21 a of the actuator valve 21 is connected to a large normal gas meter 23 via a supply pipe 22. Usually, the outlet side of the gas meter 23 is connected to a supply pipe 45 in which a valve 24 is inserted, and the downstream side of the supply pipe 45 is connected to each gas device to be supplied with gas.
[0017]
The second outlet port 21 b of the actuator valve 21 is connected to a supply pipe 26 connected to the supply pipe 22 via a small leak detection gas meter 25.
[0018]
Therefore, as shown by a thick line in FIG. 2, when the actuator valve 21 is switched to the first outlet port side, a normal gas supply path from the supply pipe 18 via the actuator valve 21, the supply pipe 22 and the normal gas meter 23 is formed. The In contrast, when the actuator valve 21 is switched to the second outlet port side as indicated by a thick line in FIG. 3, the supply pipe 18 passes through the actuator valve 21 and the leak detection gas meter 25, and further the supply pipe 22 After that, a leakage detection gas supply path that normally passes through the gas meter 23 is formed.
[0019]
Here, the normal gas meter 23 is, for example, a gas meter for a normal charge transaction with a flow rate of 30 cubic meters, and the leak detection gas meter 25 is a small flow rate with a high detection sensitivity, for example, 2. It is a gas meter of 5 cubic meters.
[0020]
Referring back to FIG. 1, switching control of the actuator bubble 21 is performed by a valve control board 27 with a built-in timer switch. In this example, the actuator valve 21 is switched to the second outlet port side for only one hour from 2 o'clock to 3 o'clock at midnight, and the leak gas detector 25 detects the midnight minute gas delivery amount. Yes. The switching time zone may be changed by an input from an operation unit provided on the control panel 27, or may be changed by a control signal from the management center 2 side.
[0021]
Next, the other second branch pipe 28 is connected to an abnormal gas meter 31 via a second LP gas pressure regulator 29 and a valve 30. The outlet side of the gas meter 31 at the time of abnormality joins the supply pipe 45 via the valve 32. The abnormal-time gas meter 31 may have a flow rate of 15 cubic meters, for example.
[0022]
Here, the first and second LP gas pressure regulators 19 and 29 are provided with a pressure difference. For example, the outlet side pressure of the pressure regulator 19 is set to 3.2 kPa, the outlet side pressure of the other pressure regulator 29 is set to 2.8 kPa, and the outlet side pressure is lower than the pressure thus set. The nozzle of the pressure regulator opens, and in the opposite case, the nozzle closes.
[0023]
In a normal gas supply state, the gas pressure on the downstream side of the meter (the gas pressure in the supply pipe 45) is higher than the outlet side installation pressure of the pressure regulator 29, so the gas supply path via the pressure regulator 29 is closed. Has been. However, the gas pressure on the downstream side of the meter (gas pressure in the supplier 45) in the normal gas supply path (thick line path in FIG. 2) or the leakage detection gas supply path (thick line path in FIG. 3) is abnormally reduced. When the pressure is lower than the outlet side set pressure in the pressure regulator 29, the nozzle of the pressure regulator 29 is opened to form a gas supply path through which the gas is supplied downstream. That is, a gas supply path that passes through the second branch pipe 28 is formed as indicated by a thick line in FIG.
[0024]
For example, when an abnormality occurs in switching of the actuator valve 21 and the gas supply path passes through the leak detection gas meter 25 during the daytime when the gas equipment is frequently used and the gas flow rate is high, the gas meter 25 A large pressure loss occurs, and there is a possibility that defective combustion or the like may occur if sufficient gas is not supplied to the gas instrument. In such a case, the gas supply path is automatically switched to the abnormal gas supply path (thick line path in FIG. 4), and adverse effects such as defective combustion are prevented.
[0025]
On the other hand, as shown in FIG. 1, a measured value such as an integrated value of the leak detection gas meter 25 is supplied to the transmission device 41. The transmission device 41 is capable of communication via the PHS network 4, and in response to a request signal from the management center 2, the meter reading result is transmitted to the management center 2 side via a communication line. Of course, the meter reading result of the normal gas meter 23 and the meter reading result of the gas meter 31 for abnormality can be similarly collected in the transmission device 41 and transmitted to the management center 2 side.
[0026]
In the midnight micro gas delivery amount check system 1 of this example configured as described above, the gas supply path is switched to the leak detection gas supply path indicated by the thick line path in FIG. 2 in the time zone from 2 o'clock to 3 o'clock at midnight. Instead, the integrated value of the gas flow rate is measured by the leaking gas meter 25 with high sensitivity.
[0027]
On the management center 2 side, the accumulated value at midnight by the gas meter for leakage 25 and the result of the leakage investigation of the gas conduit in the actual gas supply system 3 are accumulated, and based on these, it is determined whether or not gas leakage has occurred. A determination value is determined as a determination criterion for the determination. Based on the determined determination value, as shown in FIG. 5, it is determined whether the suspicion of gas leakage is large, the suspicion is small, or there is no gas leakage. Such a determination process can be automatically performed by executing a determination program installed in a personal computer on the management center side.
[0028]
Normally, the amount of gas flowing through the leak detection gas meter is about 20 liters between 2 and 3 o'clock in the middle of the night, so if this reaches, for example, 100 liters, it can be determined that there is a leak or a suspicion of leakage. . The determination value as a criterion for determining whether or not there is a leak is determined, updated, or changed by accumulating actually measured gas flow rate data.
[0029]
Next, FIG. 6 shows an example of a system configuration when the present invention is applied to a gas supply system such as an apartment house. Since the basic configuration of the gas supply system 100 is the same as that of the gas supply system 3 shown in FIG. 1, the corresponding parts are denoted by the same reference numerals and description thereof is omitted.
[0030]
In the gas supply system 100 of this example, a plurality of individual gas meters 51 (1) 51 (2), 51 (3)... Are connected in parallel on the downstream side of the supply pipe 45. The meter reading results of these gas meters are transmitted to the management center side via the multiple repeater 52 and the PHS transmission device 53. Similarly, the meter reading result of the normal gas meter 23 as the parent gas meter and the meter reading result of the leak detection gas meter 25 are also collected by the transmission device 41 via the multiple repeater 54 and transmitted to the management center side. It has become.
[0031]
In the gas supply system 100 having this configuration, it is possible to determine the presence or absence of gas leakage in the gas conduit based on the result of meter reading of the leak detection gas meter 25. It is possible to estimate the presence or absence of leakage by comparing the meter reading results of 23 and the total of the meter reading results of each gas meter 51.
[0032]
【The invention's effect】
As described above, the gas micro-delivery amount check system according to the present invention switches the gas supply path according to the time zone and the like so as to flow to the highly sensitive leak detection gas meter. Presence of leakage can be detected with high accuracy.
[0033]
Further, in the present invention, when an abnormal gas supply path is provided and switching between the normal gas supply path and the leakage detection gas supply path does not operate normally, the gas is passed through the abnormal gas supply path. Can be supplied to gas equipment and the like. Therefore, adverse effects such as a decrease in gas supply amount and hindering normal combustion of gas appliances can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a midnight micro gas delivery amount check system to which the present invention is applied.
FIG. 2 is an explanatory diagram showing a normal gas supply path in the system of FIG.
FIG. 3 is an explanatory diagram showing a leak detection gas supply path in the system of FIG. 1;
4 is an explanatory diagram showing an abnormal gas supply path in the system of FIG. 1; FIG.
5 is a graph for illustrating a method for determining the presence or absence of gas leakage based on an integrated value of a leakage detection gas meter in the system of FIG.
FIG. 6 is a schematic configuration diagram showing a case where the present invention is applied to a gas supply system for an apartment house or the like.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Midnight gas minute delivery amount check system 2 Management center 3 Gas supply system 4 PHS communication network 11, 12 Gas supply source 18, 28 Branch pipe 19, 29 Adjuster 21 Actuator valve 21a, 21b Outlet port 23 Normal gas meter 25 For leak detection Gas meter 27 Actuator valve control panel 31 Abnormal gas meter 41 Transmission device 100 Gas supply system 51 (1), 51 (2), 51 (3)...

Claims (7)

A gas micro-delivery amount check system used to detect the presence or absence of gas leakage in a gas supply path,
A normal gas supply channel for flowing gas through a normal gas meter for fee transactions;
A gas supply path for leakage detection for flowing gas through the normal gas meter and a gas meter for leakage detection having higher detection sensitivity than the normal gas meter;
A supply path switching means for switching the gas supply path on one of the normal gas supply path and the leakage gas supply passage,
An abnormal gas supply path connected in parallel to the normal gas supply path and the leakage detection gas supply path;
A gas micro-delivery amount check system comprising: an abnormal gas meter connected to the abnormal gas supply path . In claim 1,
Adjustment means for switching a gas supply path to the abnormal gas supply path based on a pressure difference between the normal gas supply path and the leakage detection gas supply path and the abnormal gas supply path; This is a system for checking the minute gas delivery amount. In claim 1 or 2,
The gas delivery amount check system characterized in that the supply path switching means switches the gas supply path to the leak detection gas supply path during a preset time zone . In claim 3,
A gas minute delivery amount check system characterized in that the time zone can be changed . In any one of claims 1 to 4,
In order to perform meter reading of the leak detection gas meter on the management center side via a communication line, a transmission device capable of transmitting the measurement value of the leak detection gas meter in response to a request from the management center is provided. Gas minute delivery amount check system. In claim 5,
The management center is connected via a communication line, and the management center compares the gas flow integrated value of the leak detection gas meter with a preset determination value to thereby determine the gas supply path. A gas minute delivery amount check system characterized by determining whether or not there is a gas leak . In claim 6,
A plurality of gas meters connected in parallel on the downstream side of the normal gas supply path,
The normal gas meter and the door gas meter can be metered by the management center via the transmission device or a separate transmission device,
The management center side compares the integrated value of the normal gas meter and the total integrated value of the door gas meter by a simultaneous meter reading of the normal gas meter and the door gas meter to determine the presence or absence of gas leakage. Gas minute delivery amount check system.

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