JP3401925B2 - Piping leak detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe leakage detecting device for automatically detecting the presence or absence of gas leakage in the upstream pipes of a plurality of gas meters.

[0002]

2. Description of the Related Art Conventionally, as a first conventional example, gas leak detection in the upstream pipes of a plurality of gas meters has been carried out as a practical example.
The configuration as shown in Japanese Patent No. 0343 has been general. The configuration will be described below with reference to FIGS. 8 and 9.

As shown in the figure, each of the collective housing 4 in the private area M from the gas collective supply means 1 such as a gas concentrated supply pipeline in the public area P through the branch means 3 by the gas supply pipe 2 Gas is supplied to the gas meter 5 provided in the house. A gas instrument 6 is connected to each gas meter 5 to receive gas supply. A gas total flow rate measuring means 7 for measuring the total flow rate of the gas supplied to all gas meters 5 is connected between the gas collective supply means 1 and the branching means 3, and the gas leak upstream of the gas meter is measured by the measured flow rate value information. It has a pipe leakage judging means 8 for judging. Information on pipe leakage determination is
It is sent to the centralized monitoring center 11 through the telephone network control device 9 and the telephone line 10 to be dealt with.

In addition, as a second conventional example, a configuration similar to the above is used, in which the total sum of gas flow rates detected by each gas meter 5 is calculated and compared with the total gas flow rate measurement value of the total gas flow rate measuring means. It is disclosed in Japanese Patent Laid-Open No. 4-363638.

The flow rate characteristic of the gas meter common to the above conventional example will be described with reference to FIG. The gas meter can flow up to the maximum flow rate M to the gas appliances, and the lowest flow rate is 500 Kcal / when using the gas stove.
It is about h. The maximum flow rate M varies depending on the amount of gas appliances owned by each house, and the capacity of the gas meter is also selected accordingly. Therefore, it is 500 as a safe use monitoring area of gas.
The range from Kcal / h to the maximum flow rate M is exceeded, and if it exceeds that range, an unsafe condition such as disconnection of gas hose or breakage of piping has occurred, and the gas meter shuts off the gas by activating the shutoff function. Is common. In addition, the gas meter has the function of detecting gas leakage in the downstream of the gas meter, and monitors the flow rate from the leak judgment value (about 20 Kcal / h) to the lower limit value of 500 Kcal / h of the safe use monitoring area of gas. , When a gas having a leakage determination value L or more continues to flow for 30 consecutive days, an alarm indicating downstream leakage is issued. However, for gas appliances that have igniting, the general igniting flow rate range is 200 Kcal / h to 300 Kcal as indicated by the diagonal lines.
Since it will enter the downstream leak detection area at about / h, if the igniter is left unlit, a warning of downstream leak will be issued. In order to avoid this, the method of registering or automatically detecting the ignition flow rate of the house and ignoring the detected flow rate is adopted.

In the configuration of the first conventional example described above, the total gas flow rate measuring means 7 is provided under the expectation that the gas appliances of all the houses will not be used at the same time even in an apartment house.
When the gas flow rate was continuously measured for 30 days and the measured flow rate value was determined by the pipe leakage determination means 8 to always exceed the leak determination value L, it was determined that there was a gas leak upstream of the gas meter.

Further, in the second conventional example, the total sum of gas flow rates detected by each gas meter 5 is subtracted from the total flow rate measurement value by the gas total flow rate measuring means, and if the value is positive, it is upstream of the gas meter. It was determined that there was a gas leak.

[0008]

However, in the pipe leakage detection device as the first conventional example, the pipe leakage determination is performed with the expectation that there is a period in which the gas appliances 6 in all homes are not used at the same time. , As the number of apartments 4 grows and the living styles of residents change, it is unclear whether there is a gas leak upstream of the gas meter 5 or whether the gas appliance 6 is continuously used. Therefore, there is a problem that the reliability of the leak judgment by the pipe leak judging means 8 is significantly lowered.

Also, as a problem common to the first and second conventional examples, it is judged that there is a gas leak upstream of the gas meter even when there is a downstream leak on the gas meter 5 side or when there is continuous use of igniting. There was a problem such as being lost.

In the second conventional example, the gas flow rate measurement is ±
Since there is an error of about 3%, the error between each gas meter and the total gas flow rate measuring means is overlapped and enlarged, and there is a problem that the reliability of the leak determination is significantly reduced.

The present invention solves the above problems, and a first object thereof is to enhance the reliability of automatic leakage determination.

The second purpose is to reliably grasp the gas leakage upstream of each gas meter. The third purpose is not to confuse the downstream leakage of each gas meter with the upstream gas leakage.

A fourth object is not to confuse the continuous use of a gas appliance with a igniter with an upstream gas leak.

A fifth object is to prevent the leakage discrimination from being unnecessarily caused by an allowable fine gas leakage which does not lead to an explosion accident.

A sixth object is not to confuse the continuous use of gas appliances with upstream gas leaks.

The seventh object is to further improve the sixth object. The eighth purpose is to clearly indicate an apartment house in which upstream gas leakage cannot be automatically identified.

A ninth object is to facilitate the installation of this device in an apartment house. The tenth object is to perform information transmission from each gas meter control means to the measurement control means without delay.

[0018]

In order to achieve the above-mentioned object, the present invention has a first configuration which is provided in a plurality of gas meters and which detects the flow rate of the gas supplied from the gas collective supply means. Flow rate detecting means, gas meter control means for performing various control of the meter using gas flow rate detection signals from the meter flow rate detecting means as basic information, and gas supplied from the gas group supply means through the branching means for each gas meter A gas supply pipe for supplying the gas, a gas total flow rate measuring means provided between the gas collective supply means and the branching means, and the gas total flow rate measuring means based on control information from each of the gas meter control means. Measurement control means
And the gas meter control means comprises a meter flow rate.
Gas appliances are used depending on the flow rate detected by the detection means
It has a device use determination means for determining whether or not the
The measurement control means does not use the gas appliance from the appliance usage determination means.
Total gas flow rate measurement when all the gas information is met simultaneously for all gas meters
A comprehensive tool usage determination method that allows gas flow rate measurement by means
And a pipe leakage determination means for determining gas leakage based on the measured flow rate value information obtained by the gas total flow rate measurement means.

[0019]

In a second configuration, the gas meter control means of the first configuration has a downstream leakage detection means for detecting gas leakage on the gas meter downstream side based on the gas flow rate information of the meter flow rate detection means, and the measurement control means is the downstream side. The present invention has a downstream leak comprehensive judging means for invalidating the leak judgment of the pipe leak judging means when there is at least one gas leak information from the leak detecting means.

In a third configuration, the gas meter control means of the first configuration has a igniting fire registration detecting means for registering or detecting the use of igniting fire of a used gas appliance connected to the downstream side of the gas meter, and the measurement control means includes the igniting fire. The present invention has a fire-fire use registration comprehensive determination means for invalidating the leak determination of the pipe leak determination means when there is even one piece of fire-fire use registration or detection information from the registration detection means.

According to a fourth structure, the pipe leakage judging means of the first structure compares the flow rate value measured by the total gas flow rate measuring means with the leak judging value, and outputs the leak when the leak judging value is exceeded. It has a flow rate excess determination means.

In a fifth configuration, the pipe leakage determination means of the fourth configuration is set by the output of the leakage flow rate excess determination means, counts a predetermined time and outputs a leakage determination output, and a total gas flow rate measurement. And a leakage flow rate decrease determination means for comparing and determining the flow rate value measured by the means with the leakage determination value, outputting the flow rate value when it is below the leakage determination value, and resetting the leakage monitoring timer.

In a sixth configuration, the pipe leakage determination means of the fifth configuration has a timer stop means for stopping the counting of the leakage monitoring timer when the gas appliance use determination is made by the appliance usage comprehensive determination means.

In a seventh configuration, the pipe leakage determination means of the sixth configuration counts a predetermined time and outputs an output, and is reset when a gas appliance is not used by the appliance usage comprehensive determination means. Is to have.

The eighth structure is provided with a plurality of gas meters and has a meter flow rate detecting means for detecting the flow rate of the gas supplied from the gas collective supply means, and a gas flow rate detecting signal from the meter flow rate detecting means as basic information. As a gas meter control means for performing various controls of the meter, a wireless transmission means for wirelessly transmitting the information of the gas meter control means together with the identification code of the gas meter, and the gas supplied from the gas collective supply means through the branching means. A gas supply pipe for supplying a gas meter, a gas total flow rate measuring means provided between the gas collective supply means and the branching means, a wireless receiving means for receiving wireless transmission information from the wireless transmission means, and its information. Gas leakage based on the measurement control means for controlling the gas total flow rate measurement means based on the above, and the flow rate value information measured by the gas total flow rate measurement means Which is constituted by a pipe leak discriminating means for discriminating.

The ninth structure is provided with a plurality of gas meters and has a meter flow rate detecting means for detecting the flow rate of the gas supplied from the gas collective supply means, and a gas flow rate detecting signal from the meter flow rate detecting means as basic information. As a gas meter control means for performing various control of the meter, a first wireless means for wirelessly transmitting the information of the gas meter control means together with the identification code of the gas meter and receiving information from the second wireless means, and a gas collective supply means A gas supply pipe for supplying the gas supplied from each of the gas meters via a branching means, a gas total flow rate measuring means provided between the gas group supplying means and the branching means, and the first wireless means. Second wireless means for transmitting and sequentially calling each gas meter using the identification code to receive information of the gas meter control means,
The measurement control means controls the total gas flow rate measuring means based on the information of the gas meter control means, and the pipe leakage determination means determines the gas leakage based on the measured flow rate value information by the total gas flow rate measuring means. .

[0028]

According to the first aspect of the present invention, the gas leakage is not judged only by the total gas flow rate measuring means, but the information on the equipment use judging means is used to judge the equipment use comprehensive judgment.
Comprehensive gas flow meter when the stage determines that all gas appliances are not used
Since the gas flow rate is measured by a measuring means,
There is no mixture of gas appliance use and gas leak information in the report
Each gas meter is not affected by the use of gas appliances.
It is possible to reliably grasp the gas leakage upstream of the data , and since the measured value of the gas leakage flow rate that is the basis of the determination is the value of only the total gas flow rate measuring means, there is no error superposition and the result is the leakage. The reliability of automatic discrimination is improved.

[0029]

Further the configuration of the Second, when there is gas leakage on the downstream side of the gas meter, although the piping leakage determination means determines erroneously preparative there leakage, since the misjudgment by the downstream leakage comprehensive judgment means is disabled, The downstream leakage of each gas meter is no longer confused with the upstream gas leakage.

Further, according to the third configuration, when there is continuous use of the igniting of the gas appliance by registering the igniting with the gas meter, the pipe leak judging means erroneously judges that there is a leak, but the igniting use registration comprehensive judging means Since the misjudgment is nullified, continuous use of each gas meter's igniting will not be confused with upstream gas leakage.

Further, according to the fourth configuration, when the flow rate value measured by the gas flow rate measuring means is judged to exceed the leak judgment value by the leak flow rate excess judging means, a leak judgment output is outputted, which does not lead to an explosion accident. It is possible to prevent leaks from being unknowingly leaked by an allowable fine gas leak.

Further, according to the fifth configuration, even if the gas appliances are continuously used for a long time, there is a period during which the gas appliances are not simultaneously used by all the gas meters even once within the leakage monitoring timer time, and the total gas flow rate measuring means. If the leakage flow rate decrease determination unit determines that the measured flow rate value is below the leakage determination value, the leakage monitoring timer is reset, so that the leakage determination does not occur erroneously.

According to the sixth configuration, it is determined that the flow rate value measured by the total gas flow rate measuring means exceeds the leak determination value by the leak flow rate excess determining means only during the period when the gas appliances of all gas meters are not used simultaneously. In this case, the leak monitoring timer is activated and the counting is advanced. Therefore, it is possible to make a reliable leak judgment after confirming that the gas leak continues for a predetermined period without being affected by the continuous use of the gas appliance.

Further, according to the seventh constitution, the continuous use of the gas appliance continues for an extremely long time, and in a special apartment house in which the leak detection timer cannot operate and the leak cannot be detected, the appliance continuous use timer operates. Then, it clearly states that it is not possible to automatically detect upstream gas leakage, and urges caution or necessary action.

In the eighth configuration, the information of the gas meter control means is sent to the measurement control means through the air using the wireless transmission means and the wireless reception means, so that each gas meter can be used in an apartment house using an existing rebar. Even in a building where wiring to the measurement control means is not possible, this pipe leakage detection device can be easily installed.

According to the ninth structure, the first wireless means is sequentially called by the second wireless means and the information of the gas meter control means is sent to the measurement control means. There is no unnecessary time delay such as waiting for transmission due to simultaneous overlap, and information transmission can be facilitated.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. The same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the gas meter 5 has a meter flow rate detecting means 12 for measuring the flow rate of gas passing through the meter, and a gas flow rate detecting signal from the meter flow rate detecting means 12 as basic information for various kinds of meters. It has a gas meter control means 13 for controlling, and this gas meter control means 13
Is a device use determination means 14 for determining whether or not the gas appliance 6 is used based on the flow rate detected by the meter flow rate detection means 12, and a downstream leak for detecting a gas leak on the downstream side based on the gas flow rate information of the meter flow rate detection means 12. Detection means 15,
It is comprised of a igniter registration detecting means 16 for registering or detecting the igniter use of the gas appliance used in the downstream side.

Further, there is provided measurement control means 17 for controlling the total gas flow rate measurement means 7 based on the control information from each gas meter control means 13, and the measurement control means 17 does not use the gas appliance from the appliance usage determination means 13. When the information is simultaneously established by all the gas meters, the instrument use total determination means 18 for causing the gas total flow rate measurement means 7 to measure the gas flow rate, and the pipe leakage determination means when at least one gas leak information from the downstream leak detection means 15 exists. Downstream leak comprehensive judgment means 19 for invalidating the leak judgment of No. 8 and the use of fire fire for invalidating the leak judgment of the pipe leak judging means 8 even when there is at least one registration or detection information of the use of fire fire from the fire fire registration detecting means 16. It is composed of a registration comprehensive judgment means 20.

Further, the pipe leakage determining means 8 compares the flow rate value measured by the gas total flow rate measuring means 7 with the leakage determination value, and outputs the leakage flow rate excess determining means 21 when it exceeds the leakage determination value. And the leakage flow rate excess determination means 2
The leak monitoring timer 22 which is set by the output of 1 to count a predetermined time and outputs a leak determination output and the flow rate value measured by the gas total flow rate measuring means 7 are compared with the leak determination value to determine the leak determination value. Leakage flow rate decrease determination means 2 which outputs when it falls below and resets the leakage monitoring timer 22
3, a timer stop means 24 for stopping the counting of the leakage monitoring timer 22 when the gas appliance usage judgment is made by the appliance usage comprehensive judgment means 18, and a gas appliance by the appliance usage integrated judgment means 18 while counting and outputting a predetermined time. It is composed of an instrument continuous use monitoring timer 25 which is reset when it is judged that it is not used.

The operation of the above configuration will be described with reference to FIG.
As shown in the timing chart of FIG. 3, the tool usage discriminating means 13 has information indicating that the tool is used by 1 and the tool is not used by 0. For example, the tools shown in A house, B house, C house, D house, and E house are illustrated. If it is in the use state, the appliance usage comprehensive determination means 18 causes the gas integrated flow rate measuring means 7 to appropriately measure the gas flow rate at the time when the gas appliance nonuse information of the homes A to D overlaps. . Therefore, since the gas flow rate is measured to detect the leak only when the gas does not originally flow, the gas leak can be surely grasped.

If a downstream leak occurs in any of the gas meters 5, the gas total flow rate measuring means 7 determines that there is a gas leak as a result of the flow rate measurement, and is confused with a gas leak upstream of each gas meter. However, since the downstream leak comprehensive determination means 19 invalidates the leakage determination based on the information from the downstream leakage detection means 15, the risk is eliminated.

If any of the gas meters 5 continuously uses a igniter, it is judged that there is a gas leak as a result of the flow rate measurement by the gas total flow rate measuring means 7, and there is a risk that it will be confused with a gas leak with the upstream side of each gas meter. However, since the downstream leak comprehensive judging means 19 invalidates the leak judgment based on the information from the igniter registration detecting means 16, the risk is eliminated. As described above, the measurement control unit 17 controls the total gas flow rate measuring unit 7 based on the control information from each gas meter control unit 13, so that the reliability of the automatic leakage determination can be increased.

Next, referring to FIG.
This will be described with reference to the timing chart of. The total gas flow rate supplied from the gas collective supply means 1 is shown in (e). A gas leak occurs after the elapsed time t5 and the total gas flow rate is always higher than the leak determination value L even when the gas appliance is not used. The output of the device usage comprehensive judgment means 18 is shown in (g), where the device usage state is 1 and the device non-use state is 0. The time during which the gas leak can be measured by the gas total flow rate measuring means 7 is prohibited by the equipment usage comprehensive judging means 18 when the equipment is used.
It becomes the area of 1 shown in (f) opposite to (g). The leakage flow rate excess determination means 21 outputs the output X as shown in (d) when the total gas flow rate exceeds the leakage determination value L shown in (e) in the gas leak measurable time shown in (f). put out. Therefore, fine gas leakage that does not lead to an explosion accident that falls below the leakage determination value L is ignored, and wasteful work such as identification and repair of gas leakage locations that are difficult to find because they are minute are eliminated.

Further, the leakage flow rate decrease determining means 23 is (f)
(C) when the total gas flow rate falls below the leakage judgment value L shown in (e) during the gas leakage measurable time shown in (c)
The output 1 shown in is output. The leakage monitoring timer 22 is reset at that time as indicated by R in (b), but the output of the leakage flow rate excess determination means 21 which should be set during the non-reset elapsed times t1 to t2 and t3 to t4 is also set to (d). As shown in the figure, since it is in the 0 state, it is in the NC state in which the timer is not counted. At the elapsed time t5, the leakage flow rate decrease determination means 2
Since (c) indicating the output of 3 is also in the state of 0 and the reset does not work, and the output of the leakage flow rate excess judging means 21 is in the state of 1 as shown in (d), the leakage monitoring timer 22 is C in (b).
It is set as shown at T to start counting. After that, as the gas leakage continues, the total gas flow rate measured by the total gas flow rate measuring means 7 exceeds the leakage determination value L as shown in (e), and the reset output by the leakage flow rate decrease determining means 23 does not occur. The leakage monitoring timer 22 outputs an output Y after a lapse of a predetermined time T1 to notify the gas leakage. Therefore, even if the number of housing in the housing complex 4 is large and the continuous use time of the gas appliance is long, if the leak monitoring timer 22 is within the predetermined time T1, the leak determination output Y will not be erroneously output. It is less likely that the continuous use of will be mistaken for gas leakage.

Further, since the timer stopping means 24 stops counting of the leak monitoring timer 22 when the gas appliance usage comprehensive judging means shown in (g) is output, the counting state at that time is shown in (a), but (b) is shown. The difference from the above is that the leakage determination time is extended by the amount of the stop of counting and the output Z is output after T2. Therefore, the leakage judgment is made after confirming that the gas leakage continues for a predetermined period T1 without being affected by the continuous use of the gas appliance, and thus the reliability of the judgment becomes higher.

Also, in an abnormal case where the number of apartments is extremely large and there is no chance of simultaneous non-use of gas appliances, gas leakage cannot be measured forever and therefore no leakage output is leaked. There is a risk that it will be erroneously determined to be none, but at that time the appliance continuous use monitoring timer 25 will not be reset, and it will be output at a predetermined time, and it will be impossible to automatically determine the upstream gas leakage. Be explicit.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. As shown in the figure, in the first embodiment, the information of the gas meter control means 13 is wirelessly transmitted together with the identification code of the gas meter 5, and the wireless transmission means 26 receives the wireless transmission information and transmits the information to the measurement control means 17. The wireless receiving means 27 is added, and other configurations are the same, and the description thereof will be omitted.

To explain the operation in the above configuration, the information transmitted from the gas meter control means 13 is wirelessly transmitted together with the identification code of the gas meter 5 by the wireless transmission means 26, which is received by the wireless reception means 27 and transmitted to the measurement control means 17. It is a thing.

Therefore, in particular, in an existing housing complex requiring this pipe leakage detection device, it is necessary to carry out reinforced concrete work or the like at each place in order to connect the gas meter 5 of each house to the measurement control means 17, so that the installation is substantially impossible. Although it is possible in many cases, the wiring work is unnecessary in this embodiment, the installation is facilitated, and the safety of the existing housing complex can be improved.

Next, the third embodiment will be described with reference to FIG. As shown in the figure, first wireless means 27 for wirelessly transmitting the information of the gas meter control means 13 together with the identification code of the gas meter 5 and wirelessly receiving the information from the second wireless means described later in the first embodiment, and In addition to the second wireless means 29, which transmits to the first wireless means 28, sequentially calls each gas meter by using the identification code, receives the information of the gas meter control means 13 and transmits the information to the measurement control means 17. Since the other configurations are the same, the description thereof will be omitted.

To explain the operation in the above configuration, the second wireless means 29 appropriately transmits to the first wireless means 28 and sequentially calls each gas meter using the identification code. The called gas meter wirelessly transmits the information of the gas meter control means 13 together with the identification code of the gas meter by the first wireless means 28, which is received by the second wireless means 29 and transmitted to the measurement control means 17. Therefore, since transmissions do not overlap at the same time, there is no useless time delay such as transmission waiting or retransmission, and information transmission can be facilitated even in a special apartment complex with a large number of homes. Can be increased.

In the above-mentioned embodiment, the appliance usage comprehensive judgment means 18 appropriately causes the gas integrated flow rate measuring means 7 to measure the gas flow rate when the gas appliance non-use information of each home overlaps. This means that the measured value of the gas flow rate by the gas total flow rate measuring means 7 when the gas appliance is used is not used for judging the gas leakage, and the gas flow rate measurement by the gas total flow rate measuring means 7 when the gas appliance is used for other purposes. If a value is required, the gas total flow rate measuring means 7 will naturally measure the gas flow rate even when using a gas appliance. Further, although it has been stated that the downstream leak comprehensive determination means 19 and the fire registration overall determination means 20 invalidate the leak determination of the pipe leak determination means 8, this may be invalidated as a result. The flow rate measurement value may be forcibly set to zero. Further, the wireless transmission means 26 and the first wireless means 28 may be built in the gas meter 5 or externally attached, and the wireless reception means 27 and the second wireless means 29 are also the measurement control means 1.
7 may be built in or externally attached, and is not limited to this embodiment.

[0055]

As is apparent from the above description, according to the present invention, the measurement control means for controlling the total gas flow rate measuring means based on the information from the gas meter control means provided in a plurality of gas meters, Since the pipe leakage determination means for determining gas leakage based on the measured flow rate value information by the flow rate measurement means is provided, the gas leakage is not determined only by the total gas flow rate measurement means, and it is obtained from each gas meter control means. Gas leakage is determined by taking into account the information
Moreover, since the measured value of the gas leakage flow rate, which is the basis of the discrimination, uses the value of only the gas total flow rate measuring means, no error is superimposed, and as a result, the reliability of the automatic leakage discrimination is improved. That is, the gas flow rate detection means
Gas appliances are used depending on the flow detected by the means
It is equipped with an instrument usage determination means to determine whether
The gas appliance non-use information from the appliance usage determination means
When the previous gas meters are simultaneously established,
Providing an instrument usage comprehensive judgment means for measuring gas flow rate
Therefore, the leak is detected only when the gas originally does not flow.
Measures the gas flow rate to ensure that gas leaks are understood
can do.

[0056]

Further, since the measurement control means is provided with the downstream leak comprehensive judging means for invalidating the leak judgment of the pipe leak judging means even when there is at least one gas leak information from the downstream leak detecting means of the gas meter, Even if there is a gas leak on the downstream side of the gas meter and the pipe leak determination means erroneously determines that there is a leak, the incorrect determination is invalidated by the downstream leak comprehensive determination means, and the downstream leak of each gas meter is confused with the upstream gas leak. Will disappear.

Further, in the measurement control means, the ignition control registration or detection information from the ignition control registration detecting means of the gas meter is 1
Even if there is any, even if there is any, there is a comprehensive litigation registration registration judgment means that invalidates the leakage judgment of the piping leak judgment means, so it is erroneously judged that the piping leakage judgment means is leaking due to continuous use of the igniting of the gas appliance by registering the igniting fire with the gas meter In this case, the erroneous judgment is invalidated by the igniter use registration comprehensive judgment means, so that continuous use of igniter of each gas meter is not confused with upstream gas leakage.

Further, the pipe leakage determination means is provided with the leakage flow rate excess determination means for comparing and determining the flow rate value measured by the gas total flow rate measuring means with the leak determination value and outputting when the flow rate value exceeds the leak determination value. , Leakage judgment output is only output when the flow rate value measured by the gas flow rate measuring means is judged to exceed the leak judgment value by the leakage flow rate excess judging means, and the allowable fine gas leak does not lead to an explosion accident. There is no need to accidentally detect leakage.

Further, a leak monitoring timer which is set in the pipe leak determining means by the output of the leak flow excess determining means to count a predetermined time and outputs a leak determination output, and a flow rate value measured by the gas total flow rate measuring means are leak determined. Since there is provided a leakage flow rate reduction determination means for comparing and discriminating against the value and outputting when the leakage determination value falls below and resetting the leakage monitoring timer, it is assumed that the gas appliance is continuously used for a long time in a normal apartment house. Even within the leak monitoring timer time, there is usually a period when all gas meters are not using the gas appliances at the same time, and if there is no gas leakage, the total gas flow rate measuring means The flow rate measured value fell below the leak judgment value. Since the leakage flow rate decrease determination means is determined, the leakage monitoring timer is reset, and therefore the leakage determination is prevented from being erroneously issued.

Further, since the pipe leakage determination means is provided with the timer stop means for stopping the counting of the leakage monitoring timer when the gas appliance use determination is made by the appliance usage comprehensive determination means, only during the period when the gas appliances of all gas meters are not used simultaneously. When the flow rate value measured by the gas flow rate measuring means is determined to exceed the leak determination value by the leak flow rate excess determining means, the leak monitoring timer counts. Therefore, it is possible to make a reliable leak judgment after confirming that the gas leak continues for a predetermined period set by the leak monitoring timer without being affected by the continuous use of the gas appliance.

Further, since the pipe leakage judging means counts a predetermined time and outputs an output, and the appliance continuous use monitoring timer which is reset when the gas appliance non-use judgment is made by the appliance usage comprehensive judging means is provided, the gas appliance is continuously used. Is extremely long, and there is no period for the leak monitoring timer to operate, and it is not possible to detect leaks, it is clearly stated that automatic continuous gas leak detection is not possible due to the continuous appliance use timer. , Safety can be assured by caution or necessary action.

Further, wireless transmission means for wirelessly transmitting the information of the gas meter control means together with the identification code of the gas meter,
Since the wireless reception means for receiving the wireless transmission information and transmitting the information to the measurement control means is provided, the information of the gas meter control means is sent to the measurement control means through the air using the wireless transmission means and the wireless reception means. By doing so, the installation of the pipe leakage detection device can be easily performed even in a prefabricated apartment building where the wiring from each gas meter to the measurement control means is not possible.

Further, first radio means for wirelessly transmitting the information of the gas meter control means together with the identification code of the gas meter and receiving information from the second radio means, which will be described later, and the identification code for transmitting to the first radio means. By calling each gas meter sequentially by using the second wireless means for receiving the information of the gas meter control means and sending the information to the measurement control means, the second wireless means sequentially calls the first wireless means. By transmitting the information of the gas meter control means to the measurement control means, even if the number of houses in the housing complex increases, there is no unnecessary time delay such as waiting for transmission due to simultaneous transmission, and information transmission can be facilitated. I can.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a pipe leakage detection device according to a first embodiment of the present invention.

[Fig. 2] Layout plan of the same pipe leak detection device

FIG. 3 is a timing chart showing the operation of the functional block diagram of the pipe leak detection apparatus.

FIG. 4 is another timing chart showing the operation of the functional block diagram of the pipe leak detection apparatus.

FIG. 5 is a functional block diagram of a pipe leakage detection device according to a second embodiment of the present invention.

FIG. 6 is a layout diagram of the same pipe leak detection device.

FIG. 7 is a functional block diagram of a pipe leakage detection device according to a third embodiment of the present invention.

FIG. 8 is a functional block diagram of a conventional pipe leakage detection device.

[Fig. 9] Layout plan of the same pipe leakage detection device

FIG. 10 is a gas flow rate characteristic diagram of a gas meter of the pipe leak detection device.

[Explanation of symbols]

1 gas group supply means 2 gas supply pipes 3 branching means 5 gas meters 7 Gas total flow rate measuring means 8 Piping leakage determination means 12 meter flow rate detection means 13 Gas meter control means 14 Instrument usage determination means 15 Downstream leakage detection means 16 Fire registration detection means 17 Measurement control means 18 Instrument usage comprehensive judgment means 19 Downstream leakage comprehensive judgment means 20 Comprehensive Judgment Registration Measures 21 Leakage flow excess determination means 22 Leakage monitoring timer 23 Leakage flow reduction determination means 24 Timer stop means 25 Instrument continuous use monitoring timer 26 Wireless transmission means 27 Wireless reception means 28 First wireless means 29 Second wireless means

Claims (9)

(57) [Claims] 1. A meter flow rate detecting means provided in a plurality of gas meters for detecting a flow rate of gas supplied from a gas collective supply means, and various meter types using gas flow rate detection signals from the meter flow rate detecting means as basic information. Gas meter control means for controlling, a gas supply pipe for supplying gas supplied from the gas group supply means to each of the gas meters via a branching means, and a gas provided between the gas group supply means and the branching means The total flow rate measuring means and the measurement control means for controlling the gas total flow rate measuring means based on the control information from the gas meter control means , and
The gas meter control means is detected by the meter flow rate detection means.
Determine whether gas appliances are being used by the flow rate
Has a device use determination means, and the measurement control means is the device
Information on non-use of gas appliances from the tool usage determination means
The gas flow rate is measured by the total gas flow rate measuring means when the two are simultaneously established.
A pipe leakage detection device having a device use comprehensive determination means for performing the above, and a pipe leakage determination means for determining gas leakage based on the measured flow rate value information by the gas total flow rate measurement means. 2. The gas meter control means has a downstream leak detection means for detecting a gas leak on the gas meter downstream side based on the gas flow rate information of the meter flow rate detection means, and the measurement control means uses the gas leak information from the downstream leak detection means. The pipe leakage detection device according to claim 1, further comprising a downstream leakage comprehensive determination unit that invalidates the leakage determination of the pipe leakage determination unit when even one exists. 3. The gas meter control means has a igniting fire registration detecting means for registering or detecting the use of igniting fire of a gas appliance in use, which is connected to the downstream side of the gas meter, and the measurement control means, the igniting fire use registration from the wicking fire registration detecting means or Detection information is 1
The pipe leakage detection device according to claim 1, further comprising a igniter use registration comprehensive determination unit that invalidates the leakage determination by the pipe leakage determination unit when any one of them exists. 4. A piping leakage determination means according to claim 1 having a leak rate excess judgment unit for output when it exceeds the leakage determination value compared judged leakage determination value measured flow rate value by the gas Overall flow rate measuring means The described pipe leak detection device. 5. The pipe leakage determining means leaks the flow rate value measured by the gas total flow rate measuring means, which is set by the output of the leakage flow rate excess determining means, counts a predetermined time and outputs a leak determination output. The pipe leakage detection device according to claim 4, further comprising: a leakage flow rate decrease determination unit that compares the determination value with a determination value, outputs the value when the leakage determination value falls below the determination value, and resets the leakage monitoring timer. 6. The pipe leakage detection device according to claim 5, wherein the pipe leakage determination means has a timer stop means for stopping counting of the leak monitoring timer when the gas appliance use determination is made by the appliance use comprehensive determination means. 7. A pipe leak discriminating means, piping leakage according to claim 6, further comprising an instrument continuous usage monitoring timer that is reset when a gas appliance not in use determined by instrumentation overall judgment means together with issue counts a predetermined time the output Detection device. 8. A meter flow rate detecting means provided in a plurality of gas meters for detecting the flow rate of the gas supplied from the gas collective supply means, and various kinds of meters using the gas flow rate detection signal from the meter flow rate detecting means as basic information. Gas meter control means for controlling, wireless transmission means for wirelessly transmitting the information of the gas meter control means together with the identification code of the gas meter, and gas supplied from the gas group supply means is supplied to each of the gas meters via a branching means. A gas supply pipe,
A gas total flow rate measuring means provided between the gas group supply means and the branching means, a wireless receiving means for receiving wireless transmission information from the wireless transmission means, and the gas total flow rate measuring means based on the information. Measurement control means for controlling,
A pipe leak detection device comprising: a pipe leak determination unit that determines a gas leak based on the measured flow rate value information obtained by the gas total flow rate measurement unit. 9. A meter flow rate detecting means provided in a plurality of gas meters for detecting the flow rate of gas supplied from a gas collective supply means, and various meter types using gas flow rate detection signals from the meter flow rate detecting means as basic information. Gas meter control means for controlling, first wireless means for wirelessly transmitting the information of the gas meter control means together with the identification code of the gas meter and receiving information from the second wireless means, and the gas collective supply means are supplied. A gas supply pipe for supplying gas to each of the gas meters via a branching means, a gas total flow rate measuring means provided between the gas collective supply means and the branching means, and the identification signal transmitted to the first wireless means. Second radio means for sequentially calling each gas meter using a code and receiving information of the gas meter control means, and based on the information of the gas meter control means The gas total flow rate and measurement control means for controlling the measuring means, the pipe leakage detection device which is constituted by a pipe leak discriminating means for discriminating gas leaks in the measurement flow rate value information by the gas total flow rate measuring means.