JP3401927B2 - 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. 7 and 8.

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 appliance, and the lowest flow rate is 500 Kcal / h when the gas stove is used.
It is a degree. 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, the safe gas usage monitoring area is 500K.
The range from cal / h to the maximum flow rate M is exceeded, and if it exceeds that, an unsafe condition such as gas hose disconnection or pipe breakage is activated, 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 gas appliances 6 in all the houses are used.
The pipe leakage is determined with the expectation that there will be periods when they are not used at the same time. However, when the number of apartments 4 grows and the resident's lifestyle changes, the gas flow upstream of the gas meter 5 will really increase. There was a problem that it was unclear whether there was a leak or whether the gas appliance 6 was continuously used, and the reliability of the leak determination by the pipe leak determination means 8 was significantly reduced. Similarly, when the number of housing units in the multiple dwelling house 4 increases and there are multiple residents who use the fire, the total flow rate of the fire is the lower limit of the safe use monitoring range of gas 5
There was a problem that it exceeded 100 Kcal / h, and even if there was a gas leak, it was determined that there was no gas leak.

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 expanded, and the value of the subtraction result becomes positive even if there is no gas leak, or even if a gas leak occurs. There was a problem that the reliability of the leak judgment was significantly reduced due to the negative value.

The present invention solves the above-mentioned problems, and a first object thereof is to realize automatic leakage determination which is less likely to be affected by the number of apartment houses and the number of fires used.

A second object is to perform automatic leak determination without being affected by the use of gas appliances.

A third object is to improve the accuracy of the automatic leak detection. The fourth purpose is to improve the stability of automatic leak detection.

A fifth object is to bring the occurrence of an error in the automatic leakage discrimination close to zero. A sixth purpose is to facilitate installation of this device in an apartment house.

[0014]

In order to achieve the above-mentioned object, the present invention has a first configuration in which a plurality of gas meters supplied with gas from a gas group supply means and a plurality of gas meters supplied from the gas group supply means. A gas supply pipe for delivering the gas to be supplied 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 for measuring a total gas flow rate, have an increased discrimination means for discriminating the increase of the minimum flow rate value storing means and the minimum flow rate value storing minimum flow rate of the gas flow rate measurement value for each predetermined period of time that is managed by the timer means by the gas total flow rate measuring means , If the minimum flow rate is increased, it is judged as leakage.
A separate pipe leakage determining means is provided.

In the second configuration, the gas is supplied from the gas collective supply means, and the meter flow rate detecting means for detecting the gas flow rate and the flow rate detected by the meter flow rate detecting means determine whether or not the gas appliance is used. A plurality of gas meters having instrument usage determining means, a gas supply pipe for delivering the gas supplied from the gas group supply means to each of the gas meters via a branching means, and the gas group supply means from the branching means. The gas total flow rate measuring means for measuring the total flow rate of the gas provided between the gas meter and the information indicating the non-use of gas appliances according to the information from the appliance usage determining means of the respective gas meters indicates to the total gas flow rate measuring means at the same time. A total sum calculation for calculating the sum total of the gas flow rates obtained from the instrument usage comprehensive determination means for measuring the gas flow rate and the meter flow rate detection means of each gas meter. Have an increased discrimination means for discriminating an increase in the difference calculation means and the difference value for calculating a difference value between the sum means and the gas total flow rate measurements by the gas total flow rate measuring means by said summation means, said difference value When is increased
A pipe leak determination means for determining a leak is provided.

In a third structure, the pipe leakage determining means of the second structure is provided with a first timer means and a gas by a gas total flow rate measuring means for each predetermined period controlled by the first timer means. There is provided a minimum flow rate value storage means for storing the minimum flow rate value of the flow rate measurement values and using the calculated value of the difference calculation means.

According to a fourth structure, in addition to the pipe leakage determining means of the first and second structures, a second timer means and a minimum flow rate value storing means for each predetermined period managed by the second timer means. The average value calculating means for calculating the lowest value or the average value of the difference values by the difference calculating means and outputting it as the discriminant value of the increase discriminating means.

In a fifth configuration, the pipe leakage determining means of the second configuration stores the difference value obtained by the difference calculating means when the gas flow rate is detected by only one meter by the sum calculating means as an error value. There is provided an error storage means for setting an error correction value at the time of calculation by the difference calculation means.

A sixth configuration is a wireless transmission unit that wirelessly transmits the information of the meter flow rate detection unit or the instrument use determination unit of the second configuration together with the identification code of the gas meter, and the wireless transmission information from the wireless transmission unit. Radio reception means for receiving and transmitting to the appliance use comprehensive judgment means or the sum calculation means is provided.

[0020]

According to the first aspect of the present invention, the total gas flow rate of the apartment house is measured by the gas total flow rate measuring means, and the lowest value is the minimum flow rate value of a specific resident of the apartment house. It is stored in the value storage means together with the measurement error. If there is no pipe leakage, the minimum value will not change forever, so the increase determination result by the increase determination means will be pulled down to zero including the above error, but if a pipe leakage occurs, a positive value will occur for the leakage flow rate, It is possible to detect piping leaks.

According to the second configuration, the total gas flow rate is measured together with the measurement error by the total gas flow rate measuring means when all the gas appliances of the housing complex are not used, and the total gas flow rate of each gas meter at the same time. Is also measured by the total sum calculation means together with the measurement error of each meter flow rate detection means. The difference calculation means subtracts the measurement value of the total sum calculation means from the measurement value of the gas total flow rate measurement means to obtain a difference value and stores it in the difference value storage means. However, if there is no pipe leakage, the true difference in gas flow rate is zero. Therefore, the difference between the measurement error of the total gas flow rate measuring means and the measurement error of the total sum calculating means appears as a difference value, but since that value does not change forever, the increase determination result by the increase determination means is bar-drawn including the error. It becomes zero.
When a pipe leak occurs, a positive value is generated by the leak flow rate.
It is possible to detect piping leaks.

According to the third configuration, the smallest value measured in the period controlled by the first timer means is selected by the lowest flow rate storage means and used as the calculated value of the difference calculation means.

Further, according to the fourth configuration, the average value of the period managed by the second timer means can be used as the determination value of the increase determination means, instead of the momentary value.

Further, with the fifth configuration, the error of each meter can be grasped. Further, according to the sixth configuration, the information of the meter flow rate detecting means or the appliance use determining means is transmitted to the appliance use comprehensive determining means or the sum calculating means via the air using the wireless transmitting means and the wireless receiving means. This piping leak detection device can be easily installed in a building where the wiring from the gas meters to the piping leak determination means is not possible in a multi-use housing.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below 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 pipe leakage determination means 8 stores the minimum flow rate of the gas flow rate measured value by the gas total flow rate measurement means 7 for each predetermined period controlled by the first timer means 12. The flow rate value storage means 13 and the signal passage 14 have increase determination means 15 for receiving the stored value and determining the increase. The second timer means 16
Average value calculating means for receiving the minimum value by the minimum flow rate storage means 13 for each predetermined period managed by the signal passage 17, calculating the average value thereof, and outputting it as the determination value of the increase determination means 15 in the signal passage 17. Have eighteen.

The operation of the above configuration will be described. As shown in FIG. 2, it is assumed that the house A, house B, and house C have the same gas flow rates as shown. Houses A and B have no sparks, while house C continuously uses sparks with gas amount f. The total gas flow rate measured by the total gas flow rate measuring means 7 in the housing complex with the house A, house B and house C is shown by a solid line e. Also d
The state when a gas leak m occurs in the pipe is shown in FIG. 3, and the total gas flow rate at that time is shown by the broken line e. This gas leak m
Is shown enlarged in the figure for easy understanding,
Actually, for example, only one No. 20 water heater has 4000
There is a consumption of 0 Kcal / h, but the leak judgment value is 20 Kcal
Since it is about / h, it can be seen that it is a very small value.
In addition, the measurement error of 40,000 Kcal / h or the error between instruments becomes 1200 Kcal / h as 3%, which is much larger than the leak determination value of 20 Kcal / h, so that the difficulty of leak determination can be understood. When the predetermined period managed by the first timer means 12 is t6, the total gas flow rate during this period fluctuates as shown by the solid line e. At this time, even if the gas flow rate is high, for example, at times t1 and t3, even if the gas flow rate values are similar, the houses using the gas at that time are different at B and C at t1 and A and C at t3. , Cannot be specified. Therefore, if a pipe gas leak occurs at t3, m is added, and if a similar increase from t1 is determined, (A home + C home + m) − (B home + C home) =
Although it becomes A house-B house + m, even if the A-house and the B-house are using the same type of appliances, the error between the appliances becomes larger than m, and the leak determination becomes impossible. However, looking at the minimum flow rate value, the ignition f of C house can be identified as shown at times t2, t4, and t5, and even when there is a pipe gas leak, m is added to it. Therefore, when there is no piping gas leakage, for example, t stored in the minimum flow rate value storage means 13
When the increase determination means 15 determines the increase based on the values of 2 and t4, (C home fire f) − (C home fire f) = 0, and it is possible to determine that there is no gas leakage even if the fire is continuously used. If there is a gas leak at t4, (C house opening fire f + m)-
(C home fire f) = m, and it is possible to determine that there is a gas leak. So far, we have explained with a simple example, but as a general content specified by remembering the lowest value, if there is no resident who uses the fire Zero is stored because there is a period when the appliances are not used at the same time, and if there is a resident who continuously uses the fire, the total flow rate of the specific fire is stored. If there is a resident who is using a continuous burner such as a special uncontrolled heater or a personal furnace, the flow rate of the particular continuous burner is stored. Therefore, by discriminating the increase in the minimum value, unspecified gas appliances cannot enter, so that automatic leakage discrimination that is less affected by the number of housing units in the housing complex and the number of fires used can be realized.

Further, the second timer means 16 and the average value calculating means 18 adopt a configuration in which the average value of the calculation results of the difference calculating means 25 is sent to the increase determining means 15, whereby the disturbance caused by the fluctuation of the gas pressure or the like. Even with this, strong automatic leak detection can be realized.

Next, a second embodiment will be described with reference to FIGS. As shown in the drawing, a gas is supplied from the gas collective supply means 1, and a meter flow rate detection means 20 for detecting the gas flow rate and whether or not the gas appliance 6 is used depending on the detected flow rate from the meter flow rate detection means 20 are detected. A plurality of gas meters 5 each having a device usage determination unit 21 for determining, a gas supply pipe 2 for delivering the gas supplied from the gas group supply unit 1 to each of the gas meters 5 through a branch unit 3, and the gas group Gas appliance non-use information is simultaneously provided by the information from the gas total flow rate measuring means 7 which is provided between the supply means 1 and the branching means 3 and measures the total flow rate of gas, and the equipment usage determining means 21 of each of the gas meters 5. When it is established, an instrument usage total determination unit 22 that instructs the total gas flow rate measurement unit 7 to measure the gas flow rate, and a meter flow rate detection unit 20 of each gas meter 5 Sum total calculation means 23 for calculating the total sum of the obtained gas flow rates, and a difference value between the total gas flow rate measurement value transmitted by the total gas flow rate measuring means 7 via the signal passage 24 and the total sum by the total sum calculation means 23. And a pipe leakage determining means 8 having an increase determining means 15 for determining an increase in the difference value. Further, the pipe leak determination means 8 is informed of the minimum flow rate value of the gas flow rate measurement value by the first timer means 12 and the gas total flow rate measurement means 7 controlled by the first timer means 12 for each predetermined period. Passage 2
The minimum flow rate value storage means 13 for storing the calculated value of the difference calculation means 25 via 6 is provided. Further, the minimum value by the minimum flow rate value storage means 13 for each predetermined period managed by the second timer means 16 is received in the signal passage 17, the average value thereof is calculated, and the discrimination value of the increase determination means 15 is calculated in the signal passage 17. It has the average value calculating means 18 which outputs as.

The operation of the above configuration will be described with reference to FIG.
As shown in, it is assumed that the A house, the B house, the C house, and the D house have the gas flow rates as illustrated. Houses A and B have no igniting, but house C uses igniting gas amount f1 continuously, and house D uses igniting gas amount f2 only during the daytime. The total gas flow rate in the housing complex with A house, B house, C house, and D house is shown by a solid line g. Further, the state when the gas leakage m of the pipe occurs is shown in h, and the total gas flow rate at that time is shown by the broken line g. In addition, i is an instrument usage comprehensive judgment means 2
According to the judgment of 2, the instrument usage discriminating means 2 of each gas meter 5
A state in which a gas appliance use signal is input from 1 is represented as 0, and a state in which simultaneous non-use of all gas appliances is established is represented as 1. The total gas flow rate during the period when all gas appliances are not used at the same time is as shown by g at t1 (C
At 1), t2, t3, and t4, (C home fire f1 + D home fire f2) is obtained, the gas meter used can be specified, and the gas flow rates of t1 and t2, t3, and t4 can be reliably identified. Therefore, even when the pipe gas leak occurs and the gas amount m increases, when the difference calculating means 25 obtains the difference from the gas flow amount before the gas amount m increases, the ignition flow rate at that time also includes a measurement error. Since only the gas amount m remains after the rod is pulled out, the increase determination means 15 can accurately determine the leakage.

Further, by adopting a configuration in which the first timer means 12 and the minimum flow rate value storage means 13 select the minimum value and send it to the difference calculation means 25, the total gas flow rate g is t1.
(C home fire f1) is specified, and the determination by the increase determination means 15 becomes more accurate.

Further, the second timer means 16 and the average value calculating means 18 adopt a configuration in which the average value of the calculation results of the difference calculating means 25 is sent to the increase determining means 15, whereby the disturbance due to the fluctuation of the gas pressure or the like. Even with this, strong automatic leak detection can be realized.

Although not shown in the figure, the pipe leakage determination means stores the difference value obtained by the difference calculation means when the gas flow rate is detected in only one gas meter by the summation calculation means as an error value and repeats it. Therefore, if the error storage means for storing the measurement error of all the gas meters and using it as the error correction value at the time of the calculation of the difference calculation means is provided, the error of the automatic leakage determination can be brought close to zero.

Next, a third embodiment will be described with reference to FIGS. As shown in the figure, in the third embodiment, first wireless means 27 for wirelessly transmitting the information of the gas meter 5 together with the identification code of the gas meter and wirelessly receiving the information from the second wireless means described later, and its first Of the gas meter 5 by sequentially calling each of the gas meters using the identification code and receiving the information of the gas meter 5 to comprehensively determine the appliance use 22
Alternatively, a second wireless means 28 for transmitting information is added to the pipe leakage determination means 8.

To explain the operation of the above configuration, the second wireless means 28 appropriately sends a signal to the first wireless means 27 and sequentially calls each gas meter using the identification code. The called gas meter sends the information of the gas meter 5 to the first wireless means 2
In step 7, wireless transmission is carried out together with the identification code of the gas meter, which is received by the second wireless means 28 and is used for comprehensive determination of appliance usage 2
2 or is transmitted to the pipe leakage determination means 8. Therefore, particularly in an existing housing complex requiring this pipe leakage detection device, it is necessary to perform reinforced concrete construction etc. in each place in order to connect the gas meter 5 of each house to the appliance use comprehensive determination means 22 or the pipe leakage determination means 8. ,
In many cases, the installation is not possible, but in this embodiment, the wiring work is not required, the installation is easy, and the safety of the existing housing complex can be improved. In addition, since there is no simultaneous overlap of transmission, there is no useless time delay such as transmission waiting and retransmission, and information transmission can be facilitated especially in special apartments with a large number of homes. Can be increased.

In the above-mentioned embodiment, the appliance use comprehensive judgment means 22 is made to appropriately measure the gas flow rate by the gas integrated flow rate measuring means 7 when the gas appliance non-use information of each house is overlapped. 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, the first wireless means 27 may be built in the gas meter 5 or may be externally attached, and the second wireless means 28 may be built in the appliance use comprehensive determination means 22 or the pipe leakage determination means 8 but externally attached. However, the present invention is not limited to this embodiment.

[0037]

As is apparent from the above description, according to the present invention, a plurality of gas meters supplied with gas from the gas group supply means and the gas supplied from the gas group supply means via the branching means. A gas supply pipe for delivering to each of the gas meters, a gas total flow rate measuring means for measuring a total flow rate of gas provided between the gas collective supply means and the branching means, and a predetermined timer controlled by a first timer means. Since the minimum flow rate value storage means for storing the minimum flow rate of the gas flow rate measurement value by the gas total flow rate measurement means and the pipe leakage determination means having the increase determination means for determining the increase of the minimum flow rate value are provided for each period. The gas appliance at that time is specified by being able to memorize the lowest value. For example, if there is no resident using igniting, normally there is a period in which gas appliances are not used at the same time even in an apartment complex, so zero is memorized and there are resident using igniting continuously. For example, the total flow rate of a specific igniter is stored. If there is a resident who is using a continuous burner such as a special uncontrolled heater or a personal furnace, the flow rate of the particular continuous burner is stored. Therefore, by discriminating the increase in the minimum value, unspecified gas appliances cannot enter, so that automatic leakage discrimination that is less affected by the number of housing units in the housing complex and the number of fires used can be realized.

Further, a gas flow is supplied from the gas collective supply means, and a meter flow rate detecting means for detecting the gas flow rate and an appliance use determination for determining whether or not a gas appliance is used according to the detected flow rate from the meter flow rate detecting means. A plurality of gas meters having means, a gas supply pipe for delivering the gas supplied from the gas group supply means to each of the gas meters via a branch means, and a gas supply pipe provided between the gas group supply means and the branch means. When the gas appliance non-use information is simultaneously established by the information from the gas total flow rate measuring means for measuring the total gas flow rate and the tool usage determining means of each gas meter, the gas total flow rate measuring means is instructed to measure the gas flow rate. And a total sum calculating means for calculating a sum of gas flow rates obtained from the meter flow rate detecting means of each gas meter, There is provided a difference calculation means for calculating a difference value between the total gas flow rate measurement value by the total gas flow rate measurement means and the sum total by the total sum calculation means, and a pipe leakage judgment means having an increase judgment means for judging an increase in the difference value. Therefore, even if only the igniting is detected in the total gas flow rate during the period when all the gas appliances are not used at the same time, even if the gas amount m increases due to the pipe gas leak, the difference calculation means 2
In No. 5, when the difference from the gas flow rate before the increase of the gas amount m is obtained, the ignition flow rate at that time is barred including the measurement error and only the gas amount m remains. It can be done accurately.

In addition, the pipe leakage determination means is provided with a first timer means and a minimum flow rate value of gas flow rate measurement values by the gas total flow rate measurement means for each predetermined period controlled by the first timer means. Since the minimum flow rate value storage means which is stored and used as the calculated value of the difference calculation means is added, the identification of the gas appliance is further narrowed down, and accordingly, the determination of the increase determination means 15 is also more accurate.

Further, the pipe leakage determining means is provided with a second timer means and an average of the minimum value by the minimum flow rate value storage means or the difference value by the difference calculating means for each predetermined period managed by the second timer means. Since the average value computing means for computing the value and outputting it as the discriminant value of the increase discriminating means is provided, it is possible to realize the automatic leak determination which is strong against the disturbance due to the fluctuation of the gas pressure and the like.

Further, in the pipe leakage determining means, the difference value obtained by the difference calculating means when the gas flow rate is detected in only one meter by the summing calculating means is stored as an error value, and by repeating this, all gas meters are stored. Since the error storage means for storing the measurement error of 1 and storing it as the error correction value at the time of the calculation of the difference calculation means is provided, the occurrence of the error of the automatic leakage determination can be brought close to zero.

Further, a wireless transmission means for wirelessly transmitting the information of the meter flow rate detection means or the equipment usage determination means together with the identification code of the gas meter, and the wireless transmission information from the wireless transmission means to receive the equipment usage comprehensive determination means or the sum calculation. In order to connect the gas meter of each house to the appliance usage comprehensive judgment means or the piping leakage judgment means, especially in the existing housing complex requiring this piping leakage detection device, since the wireless reception means for transmitting to the means is provided. In many cases, reinforced concrete work etc. is required in each place, and it is often impossible to actually install it, but in this embodiment, the wiring work is unnecessary, and the installation can be facilitated and the safety of the existing housing complex can be improved. . In addition, since there is no simultaneous overlap of transmission, there is no useless time delay such as transmission waiting and retransmission, and information transmission can be facilitated especially in special apartments with a large number of homes. Can be increased.

[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 is a diagram showing the relationship between the gas flow and the passage of time in the pipe leak detection device

FIG. 3 is a functional block diagram of a pipe leakage detection device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between gas flow and time-lapse of the pipe leakage detection device.

FIG. 5 is a functional block diagram of a pipe leakage detection device according to a third 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 conventional pipe leakage detection device.

[Fig. 8] Layout plan of the same pipe leak detection device

FIG. 9 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 First timer means 13 Minimum flow rate value storage means 15 Increase determination means 16 Second timer means 18 Mean value calculation means 20 meter flow rate detection means 21 Instrument usage determination means 22 Instrument usage comprehensive judgment 23 Summation means 25 Difference calculation means 27 First wireless means 28 Second wireless means

Claims (6)

(57) [Claims] 1. A plurality of gas meters supplied with gas from a gas group supply means, a gas supply pipe for delivering the gas supplied from the gas group supply means to each of the gas meters via a branching means, and the gas group. A gas total flow rate measuring means provided between the supply means and the branching means to measure the total gas flow rate, and a gas flow rate measurement value by the gas total flow rate measuring means for each predetermined period managed by the first timer means. have an increased discrimination means for discriminating an increase in minimum flow rate value storing means and the minimum flow rate value storing minimum flow of said top
A pipe leak detection device comprising a pipe leak determination means for determining a leak when a low flow rate value increases . 2. A meter flow rate detecting means for detecting a gas flow rate when gas is supplied from the gas collective supply means, and an appliance use determination for determining whether or not a gas appliance is used according to a detected flow rate from the meter flow rate detecting means. A plurality of gas meters having means, a gas supply pipe for delivering the gas supplied from the gas group supply means to each of the gas meters via a branch means, and a gas supply pipe provided between the gas group supply means and the branch means. , The gas total flow rate measuring means for measuring the total flow rate of gas, and the information from the instrument usage determining means means of each of the gas meters, when the gas appliance non-use information is simultaneously established, the gas total flow rate measuring means is instructed to determine the gas flow rate. An instrument use total determination means for measuring and a sum total calculation means for calculating the sum total of gas flow rates obtained from the meter flow rate detection means of each gas meter, It is composed of a difference calculation means for calculating a difference value between the total gas flow rate measurement value by the total gas flow rate measurement means and the sum total by the total sum calculation means, and a pipe leakage judgment means having an increase judgment means for judging an increase in the difference value. Pipe leakage detection device. 3. The pipe leakage determination means stores the minimum flow rate value of the gas flow rate measurement values by the first timer means and the gas total flow rate measurement means for each predetermined period managed by the first timer means, and stores the difference. The pipe leakage detection device according to claim 2, further comprising: a minimum flow rate value storage unit that is a calculation value of the calculation unit. 4. The pipe leakage determination means is an average of the minimum value by the second timer means and the minimum flow value storage means for each predetermined period managed by the second timer means or the difference value by the difference calculation means. 3. An average value calculation means for calculating a value and outputting it as a judgment value of the increase judgment means.
Any one of the pipe leakage detection devices. 5. The pipe leakage determining means stores the difference value obtained by the difference calculating means when the gas flow rate is detected by only one meter by the summing calculating means as an error value, and an error correction value at the time of calculation by the difference calculating means. The pipe leakage detection device according to claim 2, further comprising: error storage means. 6. A wireless transmission means for wirelessly transmitting the information of the meter flow rate detection means or the equipment use determination means together with the identification code of the gas meter, and the wireless transmission information from the wireless transmission means to receive the equipment use comprehensive determination means or the sum calculation. 3. The pipe leakage detection device according to claim 2, further comprising a wireless receiving unit that transmits the unit to the unit.