JP2008202947A - Gas meter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas meter device capable of improving the discrimination accuracy of fittings and the determination accuracy of an abnormality in a gas fitting or a gas pipe by revising the registered fitting discrimination value and security reference value, even if variations in the gas pressure in the gas pipe causes difference between the registered fitting discrimination value and security reference value and the starting characteristics, or the like, of actual fitting. <P>SOLUTION: This gas meter device comprises a fitting discriminating means 10 for determining the used gas fitting, a security discriminating means 11 for determining the abnormality in the gas fitting or gas pipe; a pressure measuring means 6 for measuring the gas pressure in the gas supply pipe; and a registration value varying means 13 for varying the fitting discrimination value and security reference value, in a registering/storing means 9 with the measured value of the pressure measuring means 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a gas meter that is installed at the entrance of a gas supply pipe in each home and measures the gas flow rate. It relates to the technology to detect.

  Conventionally, as shown in FIG. 12, this type of flow rate measuring apparatus has the following proposal as a method for discriminating a specific instrument (for example, refer to Patent Document 1).

The operation of the proposed example will be described. FIG. 12 shows a gas flow rate change pattern when a certain gas appliance is activated and reference values (pattern table) for performing pattern matching based on the pattern. For one gas appliance, this pattern table needs to be prepared for a series of gas flow rate change patterns generated along with the combustion control of the gas appliance, and it is also necessary for the total number of gas appliances used in each household. . A matching device is extracted by constantly comparing the change in the flow rate value measured by the flow meter of the gas meter with these pattern tables to identify the appliance to be used.
JP 2003-149027 A

  In the above configuration, if the appliance judgment value related to the discrimination of each gas appliance and the safety standard value related to the abnormality in the gas appliance or gas pipe have changed from the gas pressure in the gas pipe at the time of registration, the gas pressure adjustment It is highly likely that the volume of the combustion gas will change with an appliance without the mark and the activation status will be different from the registered data, so that the instrument will fail to be identified, or that it will fail to detect an abnormality in the gas appliance or gas pipe. It has a problem of becoming.

  The present invention solves the above-mentioned problem, and there is a difference between the appliance judgment value and the safety standard value of the registered data and the actual equipment judgment value and the security standard value due to the pressure change in the gas pipe. Even if there is a pressure measurement means, if there is a change in pressure, by changing the instrument judgment value and the safety reference value in response to the pressure change, even if the pressure in the gas pipe changes, the instrument can be identified and It is an object of the present invention to provide a technique that makes it possible to prevent erroneous detection and to easily perform maintenance of appliance judgment values and safety reference values.

  In order to solve the above-mentioned conventional problems, the gas meter device of the present invention includes flow rate measuring means connected to a household gas supply pipe and measuring a gas flow rate, and flow rate information when using a gas appliance connected to the gas supply pipe. Appliance information input means to be registered; registration storage means for storing flow rate information registered by the appliance information input means as appliance judgment values and safety reference values for judging abnormalities in gas appliances or gas supply pipes; and the registration A device determination means for comparing the gas flow rate value measured by the flow rate measurement means based on the device determination value registered in the storage means to determine the gas appliance to be used; and a security reference value registered in the registration storage means And a safety determination means for judging an abnormality in the gas appliance or the gas supply pipe by comparing with the gas flow rate value measured by the flow measurement means, and a pressure measuring means for measuring the gas pressure in the gas supply pipe When a structure having a registered value changing means for changing the registered value of the instrument determination value and the safety standard value in the registration storage unit by measurement of the pressure measuring means.

The gas meter device of the present invention is a registered instrument even if there is a difference between the registered instrument judgment value and safety reference value and the actual starting characteristics of the instrument due to the change in gas pressure in the gas pipe. By reviewing the determination value and the safety reference value, it is possible to improve the accuracy of appliance discrimination and the accuracy of determining an abnormality in the gas appliance or gas pipe.

  In addition, since the appliance discriminating function and the security function can be updated without changing the specifications of the gas meter, the maintenance of the future equipment functions can be easily performed.

  According to a first aspect of the present invention, there is provided a flow rate measurement means for measuring a gas flow rate, an appliance information input means, a registration storage means for storing data registered by the information input means, and the registration storage connected to a household gas supply pipe. A device judgment means for judging a gas appliance to be used by comparing the gas flow rate value measured by the flow rate measurement means based on the equipment judgment value which is means data, and a safety reference value registered in the registration storage means. The safety determination means for comparing the gas flow rate value measured by the flow rate measurement means to determine an abnormality in the gas appliance or the gas pipe, the pressure measurement means for measuring the gas pressure in the gas supply pipe, and the pressure measurement means The appliance judgment registered by changing the gas pressure in the gas pipe by having the registered value changing means for changing the appliance judgment value and the safety reference value in the registration storage means by the measured value of And activation characteristics of the safety standard value and the actual instrument also becomes possible to review the registered instrument determination value and safety standard value change.

  In particular, the second invention is provided with calculation means for obtaining a difference value between the flow rate values output from the flow rate measurement means in the first invention, and the difference value calculated by the calculation means and the instrument registered in the registration storage means By comparing the size of the judgment value and the safety standard value and determining the use of the gas appliance and abnormality in the gas appliance or the gas pipe, it corresponds to the measurement time of the flow rate measuring means with a simple algorithm. It becomes possible to judge a change in the usage state of the gas appliance and an abnormality in the gas appliance or the gas pipe at a speed.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the registered value changing means changes the appliance judgment value and the safety reference value in proportion to the gas pressure fluctuation when the gas pressure fluctuates. Even if there is a difference between the registered instrument judgment value and safety standard value due to changes in gas pressure in the gas pipe and the actual starting characteristics of the instrument, the registered equipment judgment value and safety standard value Can be automatically changed in response to fluctuations.

  In particular, the fourth invention is a registered value changing means for changing the value of the appliance judgment value and the safety reference value in proportion to the margin of gas pressure in proportion to the fluctuation of gas pressure. By adopting a certain configuration, it is possible to change not only the appliance judgment value and safety standard value but also the judgment margin associated with it when the pressure changes, in proportion to the change in gas pressure. It becomes possible to do.

  In particular, the fifth aspect of the invention has a gas pressure storage means for storing the gas pressure value measured by the pressure measurement means of any one of the first to fourth aspects of the invention, thereby leaving a history of the measured gas pressure. This makes it possible to clarify gas pressure fluctuations.

  The sixth invention changes the appliance determination value and the safety reference value particularly when the measured gas pressure varies more than a predetermined amount from the value stored in the gas pressure storage means in the fifth invention. By adopting the configuration as the registered value changing means, it is possible to make clear from the history that the gas pressure has changed.

In the seventh aspect of the invention, in particular, in the fifth or sixth aspect of the invention, the gas pressure information is also registered in the registration storage means when registering the instrument information, so that the pressure when the instrument determination value and the safety reference value are registered. Since the information is also registered at the same time, the relationship between the appliance judgment value and the safety standard value and the pressure is always uniquely determined.

  In the eighth aspect of the invention, in particular, in the fifth aspect of the invention, the pressure measuring means measures the gas pressure every predetermined time, so that the appliance judgment value and the safety reference value can be updated periodically, and the pressure fluctuation It is possible to reduce as much as possible the error in device discrimination and the error in abnormality determination.

  In the ninth invention, in particular, in the fifth invention, when the measurement flow rate of the measuring means does not correspond to the instrument determination value when the instrument is started, the gas pressure is measured, so that the determination failure is caused. In the case of a gas pressure change, it is possible to prevent the next failure and an error in abnormality determination.

  In the tenth aspect of the invention, in particular, in the registration storage means of any one of the first to ninth aspects of the invention, it is configured to register an appliance that changes the appliance determination value and the safety reference value when the gas pressure changes. Only the appliance whose gas flow rate changes when the appliance is activated by the gas pressure may be changed in the appliance judgment value and the safety reference value, and the appliance judgment value and the safety reference value can be updated efficiently.

  In the eleventh aspect of the invention, in particular, when the gas supply to the gas supply pipe is a cylinder system in the fifth aspect of the invention, the pressure measuring means measures the gas pressure when replacing the cylinder, so that the pressure when replacing the gas cylinder. Even when there is a change, the appliance determination value and the safety reference value are updated in response to the pressure change, so that the appliance determination and the abnormality determination do not malfunction.

  In a twelfth aspect of the invention, in particular, in any one of the first to eleventh aspects of the invention, there is provided a temperature measurement means for measuring the temperature in the gas supply pipe, and the appliance determination in the registration storage means is performed based on the measurement value of the temperature measurement means. By adopting a configuration as a registered value changing means for changing the value and the safety reference value, the appliance judgment value and the safety reference value are corrected even for a change in the starting flow rate due to the volume expansion of the gas due to a temperature change. It becomes possible.

  In the thirteenth aspect of the invention, in particular, by having a temperature storage means for storing the temperature measured by the temperature measurement means in the twelfth aspect of the invention, it is possible to leave a history of the measured temperature and clarify temperature fluctuations. Can be.

  In the fourteenth aspect of the invention, in particular, the flow rate measuring means according to any one of the first to thirteenth aspects is configured by an ultrasonic measurement method, and instantaneous measurement can be performed. Therefore, it is possible to discriminate instruments with higher accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a configuration of a gas meter device according to Embodiment 1 of the present invention.

  In FIG. 1, reference numeral 1 denotes a gas meter device, which is provided in the middle of a gas supply pipe, and one or more gas appliances installed in each customer's house are connected to the downstream pipe.

The gas meter device 1 has a gas cutoff valve 2 provided in a gas flow path connected to a gas pipe, a gas flow rate measuring means 3, and a signal from the gas flow rate measuring means 3 for arithmetic processing to obtain a used gas flow rate. A display unit 4 for displaying, a seismic sensor 5 for detecting vibration such as an earthquake, a pressure measuring means 6 for measuring the pressure in the gas pipe, a computing means 7 for performing gas appliance discrimination according to the present invention, and The appliance information input means 8, the registration storage means 9 and the appliance determination means 10 for registering the information, the safety judgment means 11 for judging an abnormality in the gas appliance or the gas pipe, and the gas pressure measured by the pressure measurement means 6 Gas pressure recording means 12 for recording, registered value changing means 13 for changing the registered content in the registration storage means 9 according to the measured value of the pressure measuring means 12, operation of the seismoscope 5 and pressure measuring means 6 and instrument judgment, Control security functions and others It has a built-in control processing for the control circuit 14 and a battery serving as their power source (not shown).

  The registration storage means 9 stores an appliance determination value that is a comparison determination value as to whether or not a flow rate change has occurred, and a security reference value that is a comparison determination value as to whether or not an abnormality has occurred. As a storage means for storing and holding recorded data, a semiconductor memory is used in the present invention. However, a magnetic recording medium or the like can be used as long as recording can be added or rewritten. Moreover, it is also possible to divide and record on a plurality of recording media as required.

  In addition, regarding the flow rate measuring means 3 of the present invention, an ultrasonic type measuring means is used, but as a measuring method, other flow rate measuring methods can be continuously measured in a constant cycle in a short time such as a full dick method. Can be used.

  The operation will be described below.

  First, ultrasonic flow velocity measurement will be described with reference to FIG. The measurement channel 15 has a rectangular cross section, and a pair of ultrasonic transmitters and receivers 16, 17 are located upstream of the channel with the measurement channel 15 sandwiched between walls perpendicular to the gas flow direction of the measurement channel 15. The side and the downstream side are mounted to face each other at an angle φ. Ultrasonic waves are alternately transmitted and received between the ultrasonic transmitters / receivers 16 and 17, and the difference between the propagation times of the ultrasonic waves in the forward direction and the reverse direction with respect to the flow of the fluid is measured at regular intervals, and output as a propagation time difference signal. Have a job. In response to this propagation time difference signal, the calculation means (not shown) calculates the flow velocity and flow rate of the fluid to be measured.

  The calculation formula is shown below.

In FIG. 2, L is a measurement distance, where t1 is the transmission time from the upstream, t2 is the transmission time from the downstream, and C is the speed of sound, the flow velocity V is expressed by the equation (1) V = (L / 2cosφ) ((1 / t1)-(1 / t2))
Although the measurement time interval can be set in a range where ultrasonic waves can be transmitted and received, in the present invention, measurement is performed at intervals of 2 seconds. Furthermore, it is possible to reduce the time interval in terms of the measurement principle. Depending on the gas instrument, there are instruments that start up in less than 2 seconds, so reducing the measurement time interval is advantageous in terms of instantaneous instrument discrimination. However, if the measurement interval is shortened, there is a problem that the battery consumption increases, and the measurement interval equivalent to the membrane type used in the conventional gas meter is a second digit order interval. Therefore, it becomes difficult to make a judgment by looking at the difference in flow rate change of the algorithm of the present invention, and in the present invention, it is performed by measuring at intervals of 2 seconds as a well-balanced time from the viewpoint of cost and instrument discrimination performance.

  Next, the procedure for determining the operating state of the gas appliance will be described with reference to FIG.

  As described above, the gas meter device 1 measures the gas flow rate at intervals of 2 seconds, sends the data to the calculation means 7, differentiates the flow rate value, and outputs it as differential data of the flow rate every 2 seconds.

The difference data is sequentially sent to the appliance determination means 10 and the security determination means 11 and is compared with the change determination value registered in the registration storage means 9. If the difference value exceeds the change determination value, it is determined that the gas appliance has changed state. When a change is detected, in order to further determine which gas appliance is in what state, first, the security judgment means 11 compares it with the safety standard value of each gas appliance and gas piping registered in the registration storage means 9. Judge whether there is any abnormality in each gas appliance and gas piping. If there is an abnormality, a predetermined abnormality process such as operating the gas shut-off valve 2 is performed. If there is no abnormality, the appliance determination means 10 next states the status of each gas appliance registered in the registration storage means 9. Compared with another change value, discrimination of the appliance and the status of the appliance are performed.

  FIG. 4A shows a change in gas flow rate and a change in difference value when an actual gas appliance is used.

  In the graph of FIG. 4A, the solid line indicates the gas flow rate value measured by the flow rate measuring means and the broken line indicates the differential value at that time, that is, the difference value every 2 seconds. The difference value is expressed with a peak on the plus side when the gas appliance is started, and is expressed with a peak on the minus side when the gas appliance is stopped.

  Next, FIG. 4B shows an example of a change in the gas flow rate and a change in the difference value when there is an abnormality in the gas appliance or the gas piping.

  In the graph of FIG. 4B, the solid line indicates the gas flow rate value measured by the flow rate measuring means and the broken line indicates the differential value at that time, that is, the difference value every 2 seconds. As an example of an abnormality in a gas appliance or gas pipe, for example, when the maximum flow rate value of a registered gas appliance is used as a safety standard value, a flow that is larger than the total flow rate value of the safety standard values of each appliance has occurred. Etc. are considered. In such a case, assuming that the flow rate value obtained by adding up the safety reference values of each appliance is 4000 l / h as a threshold value, an abnormality occurs when a flow rate of about 5000 l / h flows as shown in FIG. It is determined that the gas has occurred, and the gas cutoff valve 2 is operated as an abnormal process.

  In the above embodiment, first, when the difference value is greater than or equal to a predetermined value (change determination value), there is a change as shown in FIG. Although the identification of the appliance and the determination of the change of the state are performed, in the case of the determination for the limited appliance registered in advance and the processing speed is high, the difference value data from the calculation means is left as it is, and the change of all the gas appliances If the comparison with the point determination value data is possible within 2 seconds, it is also possible to determine the changed gas appliance or state directly from the difference value as shown in FIG.

  In addition, although the flow rate value and difference value at the time of using three apparatuses (A, B, C) simultaneously in FIG. 5 are shown on a graph, it can confirm that the change at the time of starting and a stop of three apparatuses is read.

  The discriminated information is a means for confirming information from the registration storage means 9 on the display unit 4 via the control circuit 14 or data transfer to an external terminal (not shown). Any of them can be used.

  FIG. 6 shows the change in the piping gas pressure and the change in the starting flow rate of the gas appliance.

  As shown in FIG. 6, when the piping gas pressure changes, the starting flow rate changes depending on the gas appliances (instruments A, B, and C), so the appliance judgment value and the safety reference value registered in the discrimination method described above and the actual The flow rate at the time of start-up changes and becomes a factor for misjudgment.

  Therefore, the present invention has a configuration in which the determination value of the instrument is changed when there is a change in gas pressure. The configuration will be described below.

  First, a method for measuring gas pressure according to the present invention will be described.

  As shown in the flow of FIG. 7, first, it is confirmed that there is no change in the gas flow rate. If there is no change in the flow rate, pressure measurement is started, and the measured value is stored in the gas pressure storage means 12.

  Next, the procedure for examining the gas pressure fluctuation will be described with reference to FIG.

  The gas pressure is measured, compared with the value registered in the gas pressure storage means 12, and if there is a difference greater than a predetermined value between them, a new gas pressure is registered assuming that there is a difference in gas pressure.

  Newly registered appliance judgment values and safety reference values include, for example, a method of determining appliance judgment values and safety reference values as shown in equations (2-1) and (2-2) in proportion to pressure changes. .

When a new device determination value and _{Q new new} previous appliance determination value _{Q old} new a safety standard value _{Qs new new} earlier the safety standard value _{Qs old} newly gas pressure _{P new} previous measured gas pressure _{P old} formula (2 1) _Qnew = _Qold * ( _Pnew / _Pold )
Equation _{(2-2) Qs new = Qs old} × (P new / P old)
It can be calculated with

  In addition, it is possible to give stability to the determination result by having a predetermined margin in the determination value when determining the appliance, but the margin is also set to a value according to the pressure change. It is ideal and can be obtained by the equation (3) as well as the appliance judgment value and the safety reference value.

If the margin of the appliance judgment value is M _old before the revision and M _new after the change,
Formula (3) _Mnew = _Mold * ( _Pnew / _Pold )
Calculated by

  In the above example, the determination value to be newly registered is calculated and calculated in proportion to the change in pressure. However, a method of determining from a correlation table prepared in advance for the pressure value and the determination value is also possible.

  In order to perform appliance discrimination, it is necessary to record appliance information in the registration storage means 9, but when an appliance is installed and registered on site, an appliance registration setting button (not shown) is operated. When the operation is performed, the control means 14 measures the gas pressure and records the gas pressure value at the same time, so that the relationship between the appliance judgment value and the safety reference value and the pressure is always uniquely determined by one operation. Therefore, it is not possible to make an instrument discrimination error and an error judgment error due to a registration error.

  In addition, it has time measuring means (not shown) in the device, and by performing this pressure measurement at regular time intervals, it is possible to periodically update the appliance judgment value and the safety reference value, resulting in pressure fluctuations. Even in such a case, since correction is made periodically, it is possible to reduce as much as possible the error in device discrimination and the error in abnormality determination.

  If a gas appliance is activated and there is a change in the flow rate of gas used and some appliance is activated, but there is no instrument that matches the instrument judgment value registered at the instrument discrimination, The device determines that a gas pressure fluctuation has occurred, measures the gas pressure, and if there is a difference from the previous registered value, it is assumed that there is a gas pressure fluctuation. In addition, by having a configuration for re-registering the security reference value, it is possible to have an automatic correction function in the case of erroneous determination.

  Note that when the gas pressure is changed, the gas flow rate of the appliance changes when the gas appliance is not equipped with a gas pressure adjustment device, and conversely, an appliance with a gas pressure adjustment mechanism (FIG. 6). Since the appliance D) does not need to change the appliance judgment value and the safety standard value even if the gas pressure fluctuates, register the necessity of reviewing the equipment judgment value and the safety standard value as the registration information of the appliance. Thus, it is possible to increase the efficiency of the re-registration process without performing re-registration processing for those that do not need to be changed.

  FIG. 10 shows a registration table as an example of appliance registration.

  In addition, when the gas supply is a cylinder system, the gas pressure to be supplied may change by replacing the cylinder. Therefore, when the cylinder is replaced, a cylinder replacement operation button (not shown) is provided. By operating the button or notifying the gas meter device that the cylinder has been replaced by some other means, it will automatically remeasure the pressure and, if there is a difference from the previous time, automatically review the appliance judgment value and safety standard value. It is possible to prevent the malfunction that may occur when replacing the cylinder.

(Embodiment 2)
FIG. 11 shows the configuration of the gas meter device according to the second embodiment of the present invention.

  In FIG. 11, 1 is a gas meter device, which is provided in the middle of a gas supply pipe, and one or more gas appliances installed in each customer's house are connected to the downstream pipe.

  The gas meter device 1 has a gas cutoff valve 2 provided in a gas flow path connected to a gas pipe, a gas flow rate measuring means 3, and a signal from the gas flow rate measuring means 3 for arithmetic processing to obtain a used gas flow rate. A display unit 4 for displaying, a seismic sensor 5 for detecting vibration such as an earthquake, a pressure measuring means 6 for measuring the pressure in the gas pipe, a computing means 7 for performing gas appliance discrimination according to the present invention, and The appliance information input means 8, the registration storage means 9 and the appliance determination means 10 for registering the information, the safety judgment means 11 for judging an abnormality in the gas appliance or the gas pipe, and the gas pressure measured by the pressure measurement means 6 Gas pressure recording means 12 for recording, temperature measuring means 18 for measuring the temperature in the gas pipe, temperature recording means 19 for recording the temperature measured by the temperature measuring means 18, and measured values and temperature records of the pressure measuring means 12. hand A registered value changing means 20 for changing the registered contents in the registration storage means 9 based on the 19 measured values, a control circuit 14 for performing overall control processing of the operation of the seismoscope 5 and the pressure measuring means 6, instrument judgment, safety function and the like, and A battery (not shown) serving as a power source is incorporated. The difference from the first embodiment is that a temperature measuring unit 18, a temperature storing unit 19, and a registered value changing unit 20 are provided.

  The operation will be described below.

  First, the temperature in the gas supply pipe is measured by the temperature measuring means 18, the difference from a certain predetermined reference temperature is obtained, and then the volume expansion of the gas with respect to a certain predetermined reference temperature is calculated. Since the volume expansion of the gas becomes a change in the gas flow rate due to a temperature change, the appliance determination value and the security reference value in the registration storage unit 9 are corrected by the value calculated by the registration value changing unit 20.

  As described above, the apparatus has the temperature measuring means 18 capable of measuring the temperature in the gas supply pipe, and knows the change in the gas flow rate due to the volume expansion of the gas. Even if there is a difference between the value and the safety standard value and the actual starting characteristics of the device, it is possible to correct the device judgment value and the safety standard value, so it is possible to prevent errors in device discrimination and errors in abnormality judgment. .

  Further, by providing the temperature storage means 19 for recording the temperature measured by the temperature measurement means 18, it is possible to leave a history of the measured temperature, and the temperature fluctuation can be clarified.

  In addition, by setting it as the structure which memorize | stores reference temperature in the temperature memory | storage means 19, it is also possible to register the temperature at the time of apparatus installation as reference temperature.

  In the ultrasonic measurement method, since the transmission time of the ultrasonic wave changes due to a temperature change, it is possible to detect a change in temperature from the time difference. Therefore, the gas flow rate measuring means 3 and the temperature measuring means 18 are combined. You can also

  As described above, the gas meter device according to the present invention is connected to a household gas supply pipe and stores flow rate measuring means for measuring a gas flow rate, instrument information input means, and data registered by the instrument information input means. A registration storage unit that compares the gas flow rate value measured by the flow rate measurement unit based on the appliance determination value that is data of the registration storage unit, and determines the gas appliance to be used. The safety judgment means for comparing the gas flow rate value measured by the flow rate measurement means based on the safety standard value registered in the means and judging the abnormality in the gas appliance or gas pipe, and the gas pressure in the gas supply pipe is measured. And a registered value changing means for changing the registration data of the appliance judgment value and the safety reference value in the registration storage means according to the measured value of the pressure measuring means. Even if there is a difference between the registered device judgment value and safety standard value and the actual starting characteristics of the device due to changes in pressure, the device judgment is made by reviewing the registered device judgment value and safety standard value. And the accuracy of determining an abnormality in the gas appliance or gas pipe can be improved.

  In addition, since the appliance discriminating function and the security function can be updated without changing the specifications of the gas meter, the maintenance of the future equipment functions can be easily performed.

Configuration diagram of a flow rate measuring device according to Embodiment 1 of the present invention Configuration diagram of a flow rate measurement unit in Embodiment 1 of the present invention Flow chart of discrimination operation in Embodiment 1 of the present invention Characteristics diagram of flow rate and calculation value in Embodiment 1 of the present invention Characteristics diagram of flow rate and calculation value in Embodiment 1 of the present invention Correlation diagram between pressure change and gas flow rate in Embodiment 1 of the present invention Flow chart for explaining functions in the first embodiment of the present invention Flow chart for explaining functions in the first embodiment of the present invention Flow chart for explaining functions in the first embodiment of the present invention State diagram of registration data in Embodiment 1 of the present invention Configuration diagram of a flow rate measuring apparatus according to Embodiment 2 of the present invention Discrimination method data structure diagram of conventional flow measurement device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas meter apparatus 2 Gas shut-off valve 3 Flow measuring means 4 Display part 5 Seismic device 6 Pressure measuring means 7 Calculation means 8 Instrument information input means 9 Registration storage means 10 Appliance judgment means 11 Security judgment means 12 Gas pressure memory means 13 Registered value Change means 14 Control circuit 15 Measurement flow path 16, 17 Ultrasonic transmitter / receiver 18 Temperature measurement means 19 Temperature storage means 20 Registered value change means

Claims (14)

A flow rate measuring means connected to a household gas supply pipe for measuring the gas flow rate, an appliance information input means for registering flow rate information when using the gas appliance connected to the gas supply pipe, and the appliance information input means are registered. The flow rate information based on the appliance determination value registered in the registration storage means, and the registration storage means for storing the flow rate information as the appliance judgment value and the safety reference value for judging the abnormality in the gas appliance or the gas supply pipe A gas flow value measured by the flow rate measuring means based on a safety reference value registered in the registration storage means; Safety judgment means for comparing and determining abnormality in the gas appliance or gas supply pipe, pressure measurement means for measuring the gas pressure in the gas supply pipe, and the stored value in the registration storage means by the measured value of the pressure measurement means Ingredients judgment value and gas meter device having a register value changing means for changing the registered value of the safety standard value. The appliance determination means has a calculation means for obtaining a difference value between the flow rate values output from the flow measurement means, the difference value calculated by the calculation means, the appliance determination value and the security reference value registered in the registration storage means, The gas meter device according to claim 1, wherein the gas meter device is used to determine use of the gas appliance and abnormality in the gas appliance or the gas pipe. 3. The gas meter device according to claim 1, wherein the registered value changing means changes the appliance judgment value and the safety reference value in proportion to the gas pressure fluctuation when the gas pressure fluctuates. 4. The gas meter device according to claim 3, wherein the appliance determination value and the safety reference value have a predetermined margin width, and are registered value changing means for changing the value in proportion to the gas pressure fluctuation with respect to the margin. The gas meter device according to claim 1, further comprising a gas pressure storage unit that stores a gas pressure value measured by the pressure measurement unit. When the gas pressure measured by the pressure measuring means is different from a value stored in the gas pressure storing means by a predetermined amount or more, the registered value changing means changes the appliance judgment value and the safety reference value. Item 6. The gas meter device according to Item 5. The gas meter device according to claim 5 or 6, wherein the gas pressure information is also registered in the gas pressure storage means simultaneously with registering the instrument information in the registration storage means. 6. The gas meter device according to claim 5, wherein the pressure measuring means measures the gas pressure every predetermined time. When the measured flow rate of the flow rate measuring means when the pressure measuring means does not correspond to the appliance judgment value registered in the registration storage means, the gas pressure is measured, and the registered value changing means changes the equipment judgment value and the safety reference value. The gas meter device according to claim 5. The gas meter device according to any one of claims 1 to 9, wherein an appliance that changes the appliance determination value and the safety reference value when the gas pressure changes is registered in the registration information of the registration storage means. 6. The gas meter device according to claim 5, wherein when the gas supply to the gas supply pipe is of a cylinder system, the pressure measuring means measures the gas pressure when replacing the cylinder. The temperature measuring means for measuring the temperature in the gas supply pipe, and the registered value changing means for correcting the registered value of the appliance judgment value and the safety reference value in the registration storage means by the measured value of the temperature measuring means. The gas meter device according to any one of the above. The gas meter device according to claim 12, further comprising temperature storage means for storing the temperature measured by the temperature measurement means. The gas meter device according to any one of claims 1 to 13, wherein the flow rate measuring means includes an ultrasonic measurement method.

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