WO2020235423A1 - Gas safety device and gas safety system - Google Patents

Gas safety device and gas safety system Download PDF

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Publication number
WO2020235423A1
WO2020235423A1 PCT/JP2020/019154 JP2020019154W WO2020235423A1 WO 2020235423 A1 WO2020235423 A1 WO 2020235423A1 JP 2020019154 W JP2020019154 W JP 2020019154W WO 2020235423 A1 WO2020235423 A1 WO 2020235423A1
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Prior art keywords
gas
pressure
true value
absolute
pressure sensor
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PCT/JP2020/019154
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French (fr)
Japanese (ja)
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健太 内田
憲司 安田
行徳　太一
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パナソニックＩｐマネジメント株式会社
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Publication of WO2020235423A1 publication Critical patent/WO2020235423A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
    • G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure

Definitions

  • the present invention relates to a gas security device that measures a gas flow rate and shuts off a gas passage when an abnormal flow rate is measured to ensure safety in using gas.
  • a gas meter that measures the amount of gas used discloses a gas safety device that determines that it is abnormal and shuts off the gas passage to ensure safety (see Patent Document 1).
  • This gas safety device includes an ultrasonic sensor, an ultrasonic flow rate measuring unit in which a circuit board including an ultrasonic sensor drive circuit is integrated, a pressure sensor for measuring the differential pressure between the supply pressure side and the atmospheric pressure, and pressure.
  • a control unit that shuts off the flow path to stop the gas supply and a notification unit that reports.
  • the present disclosure provides a gas security device effective for measuring a gas supply pressure using an absolute pressure sensor.
  • the gas security device in the present disclosure includes a flow path through which gas flows, a flow rate measuring unit for measuring the flow rate of gas flowing through the flow path, a first pressure sensor arranged inside the flow path and measuring the absolute pressure of gas, and a first pressure sensor.
  • a second pressure sensor which is arranged outside the flow path and measures the absolute pressure of atmospheric pressure, is provided. Further, the gas safety device in the present disclosure is based on the difference and true value between the gas pressure true value acquisition unit that acquires the true value of the gas gauge pressure from the outside and the measured values of the first pressure sensor and the second pressure sensor.
  • a gas pressure determination unit that calculates a correction value of a measured value and calculates a gas supply pressure based on the difference between the measured values of the first pressure sensor and the second pressure sensor and the correction value.
  • the gas security device in the present disclosure controls the flow rate measuring unit and the shutoff valve that shuts off the flow path, and determines that the gas is abnormal from the flow rate measured by the flow rate measuring unit and the gas supply pressure calculated by the gas pressure determining unit.
  • a control circuit for shutting off the flow path with a shutoff valve is provided.
  • the gas security device in the present disclosure includes a flow path through which the gas flows, a flow rate measuring unit for measuring the flow rate of the gas flowing through the flow path, and a first pressure sensor arranged inside the flow path for measuring the absolute pressure of the gas. And a second pressure sensor that is arranged outside the flow path and measures the absolute pressure of atmospheric pressure.
  • the gas security device in the present disclosure includes a gas absolute pressure true value acquisition unit that acquires the true value of the absolute gas pressure from the outside, and an atmospheric absolute pressure true value acquisition unit that acquires the true value of the absolute atmospheric pressure from the outside. And.
  • the gas safety device in the present disclosure calculates the first correction value of the first pressure sensor from the difference between the measured value of the first pressure sensor and the true value of the absolute pressure of the gas, and of the second pressure sensor.
  • the second correction value of the second pressure sensor is calculated from the difference between the measured value and the true value of the absolute pressure of the atmosphere, and the measured value of the first pressure sensor, the measured value of the second pressure sensor, and the first correction It is provided with a gas pressure determination unit that calculates the gas supply pressure from the value and the second correction value.
  • the gas security device in the present disclosure controls the flow rate measuring unit and the shutoff valve that shuts off the flow path, and determines that the gas is abnormal from the flow rate measured by the flow rate measuring unit and the gas supply pressure calculated by the gas pressure determining unit.
  • a control circuit for shutting off the flow path with a shutoff valve is provided.
  • the present disclosure can accurately measure changes in gas supply pressure in a gas security device in which gas does not eject even when the temperature around the gas security device becomes high.
  • FIG. 1 is a configuration diagram of a gas security device according to the first embodiment.
  • FIG. 2 is a block diagram of the gas security system according to the first embodiment.
  • FIG. 3 is a configuration diagram showing another configuration of the gas security system according to the first embodiment.
  • FIG. 4 is a block diagram of the gas security device according to the second embodiment.
  • FIG. 5 is a block diagram of the gas security system according to the second embodiment.
  • FIG. 6 is a configuration diagram showing another configuration of the gas security system according to the second embodiment.
  • the pressure sensor built into the gas security device is a differential pressure measurement type that measures the gas pressure based on the atmospheric pressure, it has a through hole for introducing the gas into the pressure sensor, and the area around the gas security device is very large. When the temperature becomes high, the pressure sensor may be deformed and gas may leak from the through hole. Therefore, as a configuration that does not require a through hole, there is a configuration in which the change in gas supply pressure is measured from the difference between the measured values of the absolute pressure pressure sensor that measures the atmospheric pressure and the absolute pressure pressure sensor that measures the gas pressure.
  • the present disclosure provides a gas security device effective for measuring the supply pressure of gas using an absolute pressure sensor.
  • the gas security device will be described as a gas meter.
  • the gas meter 100 which is a gas safety device, includes a flow path 101 through which gas flows, a shutoff valve 102 that shuts off the flow path 101, a flow rate measuring unit 103 that measures the flow rate of gas flowing in the flow path 101, and a flow rate.
  • a control circuit 104 that integrates the amount of gas used by using the flow rate measurement data measured by the measuring unit 103 is provided.
  • the gas meter 100 includes a gas side absolute pressure pressure sensor 105 which is a first pressure sensor for measuring the gas side where the absolute pressure can be measured, and an atmospheric side absolute pressure pressure which is a second pressure sensor for measuring the atmospheric pressure side.
  • the gas meter 100 includes a sensor 106, an electronic circuit 107 installed in a gas atmosphere, and a gas pressure true value acquisition unit 108 that acquires the true value of the gas pressure from the outside. Further, the gas meter 100 is corrected by the difference between the two absolute pressure values measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106 and the true value of the gauge pressure acquired by the gas pressure true value acquisition unit 108.
  • the gas pressure determination unit 109 is provided, which calculates the gas supply pressure from the two absolute pressure values and the correction value.
  • the control circuit 104 determines whether or not there is an abnormality such as a gas leak based on the flow rate measured by the flow rate measuring unit 103, the gas supply pressure obtained by the gas pressure determining unit 109, or a change thereof, and if it is determined to be abnormal, the control circuit 104 determines.
  • the shutoff valve 102 shuts off the flow path 101 to stop the gas supply.
  • the gas-side absolute pressure pressure sensor 105 is mounted as an electronic component on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, and the signal from the control circuit 104 indicates that the gas in the flow path 101 Measure the absolute pressure. Further, the atmospheric side absolute pressure pressure sensor 106 is mounted as an electronic component on the control circuit 104 installed on the atmospheric side outside the flow path 101, and measures the atmospheric side absolute pressure with a signal from the control circuit 104. To do.
  • FIG. 2 shows a gas safety system using the gas meter 100 in the present embodiment, in which the gas meter 100 is connected to each of the gas pipes 200a, 200b, 200c ... Branched from the gas pipe 200, and the gas meter
  • a medium pressure regulator 201 which is a pressure measuring device, is installed in the gas pipe 200 on the upstream side of 100 to reduce the gas supply pressure.
  • the medium pressure regulator 201 has a pressure sensor (not shown) capable of measuring the true value of the gas pressure.
  • the gas is depressurized by the medium pressure regulator 201 and supplied to gas appliances and the like through a gas pipe 200 on the downstream side and a gas meter 100 installed in each household.
  • the medium pressure regulator 201 is provided with a sensor capable of measuring gas pressure with high accuracy, for example, a pressure sensor for measuring the differential pressure between gas pressure and atmospheric pressure (that is, gauge pressure).
  • a pressure sensor for measuring the differential pressure between gas pressure and atmospheric pressure (that is, gauge pressure).
  • gauge pressure the differential pressure between gas pressure and atmospheric pressure
  • the medium pressure regulator 201 and the gas meter 100 which are pressure measuring devices, measure the pressure, respectively, and the gas meter 100 transmits the true value PG of the gauge pressure from the medium pressure regulator 201, communication 201a, etc.
  • Pg-Pa the absolute pressure P calculated by the gas pressure determination unit 109
  • the difference between the gas supply pressure P calculated by the gas pressure determination unit 109 and the true value PG of the gas supply pressure acquired from the medium pressure regulator 201 is corrected as the correction value Pc to be accurate.
  • the gas supply pressure can be calculated.
  • the gas meter 100 By storing the correction value Pc in a storage device or the like (not shown), the gas meter 100 corrects even when the true value PG of the gas supply pressure cannot be obtained from the medium pressure regulator 201 due to the use of gas or the like. It can be carried out. Further, when the true value PG of the gas supply pressure can be acquired, the gas meter 100 can always update to the latest correction value Pc by storing a new correction value Pc based on the true value PG in a storage device or the like, and over time. Can respond to changes.
  • FIG. 3 shows another configuration of the gas safety system using the gas meter 100 in the present embodiment, in which one gas meter A202 among the gas meters connected on the gas pipe 200 has a gauge pressure of the gas supply pressure. It is a figure which shows the case where the true value PG of is measurable.
  • the gas meter A202 is a second gas safety device, and is provided with a sensor capable of measuring gas pressure with high accuracy, for example, a pressure sensor for measuring the differential pressure between the gas pressure side and the atmospheric pressure, and periodically has a pressure measurement accuracy. Has been calibrated.
  • the gas meter A202 and the gas meter 100 which are the second gas safety devices, measure the gas supply pressure, respectively, and the gas meter 100 supplies the gas from the gas meter A202.
  • the true value PG of the gauge pressure of the pressure using communication 202a or the like, it is possible to improve the pressure measurement accuracy of the gas meter 100.
  • the gas meter A202 which is the second gas safety device, has the same configuration as the gas meter 100, and was obtained by measurement by periodically calibrating the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106.
  • the true value PG of the gauge pressure may be calculated from the difference between the two absolute pressures.
  • the gas meter that measures the gas supply pressure by the difference between the absolute pressure of the gas and the absolute pressure of the atmosphere measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106.
  • the true value PG of the gas supply pressure is acquired from the outside.
  • the same can be achieved even if the flow rate measuring unit is used for ultrasonic flow rate measurement.
  • the gas side absolute pressure pressure sensor 105 has been described as being mounted on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, but if it is inside the flow path, It can be implemented anywhere. Further, although the configuration has been described in which the atmospheric pressure absolute pressure sensor 106 is mounted on the control circuit 104 installed on the atmospheric side outside the flow path 101, there is no limitation on the mounting location as long as the atmospheric pressure can be measured.
  • the gas security device will be described as a gas meter.
  • the same components described will be designated by the same number.
  • the gas meter 300 which is a gas safety device, includes a flow path 101 through which gas flows, a shutoff valve 102 that shuts off the flow path 101, a flow rate measuring unit 103 that measures the flow rate of gas flowing in the flow path 101, and a flow rate.
  • a control circuit 304 that integrates the amount of gas used by using the flow rate measurement data measured by the measuring unit 103 is provided.
  • the gas meter 300 includes a gas side absolute pressure pressure sensor 105 which is a first pressure sensor for measuring the gas side where the absolute pressure can be measured, and an atmospheric side absolute pressure pressure which is a second pressure sensor for measuring the atmospheric pressure side. It includes a sensor 106.
  • the electronic circuit 107 installed in the gas atmosphere, the gas absolute pressure true value acquisition unit 301 that acquires the true value of the absolute pressure of the gas supply pressure from the outside, and the gas absolute pressure true value acquisition unit 301 that acquires the true value of the absolute pressure of the atmosphere from the outside. It is provided with an atmospheric absolute pressure true value acquisition unit 302 and a gas pressure determination unit 109.
  • the gas pressure determination unit 109 calculates the gas side correction value from the absolute pressure measured by the gas side absolute pressure pressure sensor 105 and the true value of the gas side absolute pressure acquired by the gas absolute pressure true value acquisition unit 301. Further, the gas pressure determination unit 109 calculates the atmospheric side correction value from the absolute pressure measured by the atmospheric side absolute pressure pressure sensor 106 and the true value of the atmospheric side absolute pressure acquired by the atmospheric absolute pressure true value acquisition unit 302. Further, the gas pressure determination unit 109 corrects each absolute pressure measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106 with the gas side correction value and the atmosphere side correction value, and the difference thereof. Calculate the gas supply pressure with.
  • the control circuit 304 determines whether there is an abnormality such as a gas leak from the flow rate measured by the flow rate measuring unit 103, the gas supply pressure obtained by the gas pressure determining unit 109, or a change thereof, and if it is determined to be abnormal, the control circuit 304 determines.
  • the shutoff valve 102 shuts off the flow path 101 to stop the gas supply.
  • the gas-side absolute pressure pressure sensor 105 is mounted as an electronic component on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, and the gas inside the flow path 101 is received by a signal from the control circuit 104. Measure the absolute pressure of. Further, the atmospheric side absolute pressure pressure sensor 106 is mounted as an electronic component on the control circuit 104 installed on the atmospheric side outside the flow path 101, and the absolute pressure on the atmospheric side is measured by a signal from the control circuit 104. taking measurement.
  • FIG. 5 shows a gas security system using the gas meter 100 in the present embodiment.
  • a gas meter 300 is connected to each of the gas pipes 200a, 200b, 200c ... Branched from the gas pipe 200, and the gas supply pressure is applied to the gas pipe 200 on the upstream side of the gas meter 100.
  • a medium pressure regulator 401 which is a pressure measuring device for reducing the pressure, is installed.
  • the medium pressure regulator 401 has an absolute pressure sensor (not shown) capable of measuring the true values of the gas supply pressure and the absolute pressure of atmospheric pressure.
  • the gas is decompressed by the medium pressure regulator 401 and supplied to gas appliances and the like through the gas pipe 200 on the downstream side and the gas meter 300 installed in each household.
  • the medium pressure regulator 401 which is a pressure measuring device, is equipped with an absolute pressure pressure sensor that can measure the absolute pressure of the gas supply pressure and the absolute pressure of the atmospheric pressure with high accuracy, and the measurement accuracy is calibrated regularly.
  • the gas supply pressure and the absolute pressure of the atmospheric pressure are measured by the medium pressure regulator 401 and the gas meter 300, which are pressure measuring devices, respectively, and the gas meter 300 measures the gas supply pressure from the medium pressure regulator 201.
  • the true value PAg of the absolute pressure of the above and the true value PAa of the absolute pressure of the atmosphere are acquired by using communication 401a or the like. With this configuration, the measured value by the gas side absolute pressure pressure sensor 105 and the measured value by the atmospheric side absolute pressure pressure sensor 106 of the gas meter 300 can be corrected, and the pressure measurement accuracy can be improved.
  • the difference between the absolute pressure measured by the gas side absolute pressure sensor 105 and the true value PAg of the absolute pressure of the gas supply pressure acquired from the medium pressure regulator 401 is corrected as the gas side correction value Pgc. To do. Further, the difference between the absolute pressure measured by the atmospheric absolute pressure sensor 106 and the true value PAa of the absolute pressure of the atmospheric pressure acquired from the medium pressure regulator 401 is corrected as the atmospheric correction value Pac to obtain an accurate gas.
  • the supply pressure can be calculated.
  • the gas meter 300 stores the gas side correction value Pgc and the atmosphere side correction value Pac in a storage device or the like (not shown), so that the absolute pressure of the gas supply pressure from the medium pressure regulator 401 during the use of gas or the like. Even if the true value PAg of and the PAa of the absolute pressure of atmospheric pressure cannot be obtained, the correction can be performed. Further, when the true values PAg and PAa can be obtained, the gas meter 300 always stores the latest correction values Pgc and Pac in a storage device or the like based on the true values PAg and PAa. It can be updated to and can respond to changes over time.
  • FIG. 6 shows another configuration of the gas safety system using the gas meter 300 in the present embodiment, and the true values PAg and PAa of the gas supply pressure and the absolute pressure of the atmospheric pressure can be measured on the gas pipe 200. It is a figure when there is a gas meter B402.
  • the gas meter B402 is a second gas safety device and has an absolute pressure sensor capable of measuring gas supply pressure and atmospheric pressure with high accuracy. For example, it is assumed that the pressure accuracy is calibrated regularly. ..
  • the gas meter B402 and the gas meter 300 which are the second gas safety devices capable of measuring the true value of the gas pressure in a state where there is almost no gas flow, measure the absolute pressure, respectively.
  • the gas meter 300 can improve the pressure measurement accuracy of the gas meter 300 by acquiring the true value PAg of the absolute pressure of the gas and the true value PAa of the absolute pressure of the atmosphere from the gas meter B402 by using the communication 402a or the like. It becomes.
  • the gas meter B402 which is the second gas safety device, has the same configuration as the gas meter 300, and by periodically calibrating the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106, the true value PAg is always set. PAa may be measured.
  • the gas meter that measures the gas supply pressure by the difference between the absolute pressure of the gas and the absolute pressure of the atmosphere measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106.
  • the true values PAg and PAa of the absolute pressures of gas and atmosphere are acquired from the outside.
  • the absolute atmospheric pressure can be obtained from another device having a true value such as meteorological information.
  • the same can be achieved even if the flow rate measuring unit is used for ultrasonic flow rate measurement.
  • the gas side absolute pressure pressure sensor 105 has been described as being mounted on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, but anywhere in the flow path. Needless to say, it may be implemented in. Further, although the configuration has been described in which the atmospheric pressure absolute pressure sensor 106 is mounted on the control circuit 104 installed on the atmospheric side outside the flow path 101, there is no limitation on the mounting location as long as the atmospheric pressure can be measured.
  • the gas security device in the present disclosure can prevent gas from being ejected from the through hole for the pressure sensor even when the surrounding temperature becomes high, it can not only improve safety but also provide it at a lower cost, and can be provided for general household use. And can be applied to applications such as commercial gas meters.
  • Gas pressure determination unit 200, 200a, 200b, 200c Gas piping (piping) 201, 401 Medium pressure regulator (pressure measuring device) 202 Gas meter A (second gas security device) 402 Gas meter B (second gas security device) 301 Gas absolute pressure true value acquisition unit 302 Atmospheric absolute pressure true value acquisition unit

Abstract

A gas safety device (100) is provided with: a flow rate measurement unit (103) for measuring the flow rate of gas flowing through a flow path (101); a first pressure sensor that is disposed inside the flow path (101) and measures an absolute pressure of the gas; and a second pressure sensor that is disposed outside the flow path (101) and measures an absolute pressure of the atmospheric pressure. The invention is also provided with: a gas pressure true value acquisition unit (108) for acquiring a true value of gauge pressure of the gas from the exterior; and a gas pressure determination unit (109) for calculating a correction value of a measurement value from the difference between the measurement values of the first pressure sensor and the second pressure sensor and from the true value, and calculating a gas supply pressure on the basis of the difference between the measurement values of the first pressure sensor and the second pressure sensor and on the basis of the correction value. The invention is further provided with: a shut-off valve (102) for shutting off the flow path (101); and a control circuit (104) for controlling the flow rate measurement unit (103) and shutting off the flow path (101) with the shut-off valve (102) if there has been determined to be an abnormality from the flow rate measured at the flow rate measurement unit (103) or the gas supply pressure calculated at the gas pressure determination unit (109).

Description

ガス保安装置、及び、ガス保安システムGas security device and gas security system
　本発明は、ガス流量を計測し、異常流量が計測された場合にはガス通路を遮断し、ガス使用上の安全性を確保するガス保安装置に関するものである。 The present invention relates to a gas security device that measures a gas flow rate and shuts off a gas passage when an abnormal flow rate is measured to ensure safety in using gas.
　従来、ガスの使用量を測定するガスメータが、異常と判定してガス通路を遮断し、安全性を確保するガス保安装置を開示する（特許文献１参照）。このガス保安装置は、超音波センサと、超音波センサ駆動回路が構成された回路基板を一体とした超音波流量計測部と、供給圧側と、大気圧の差圧を測定する圧力センサと、圧力センサで測定した圧力が異常であると判断した場合は、流路を遮断してガスの供給を停止する制御部と、通報する通報部を備える。 Conventionally, a gas meter that measures the amount of gas used discloses a gas safety device that determines that it is abnormal and shuts off the gas passage to ensure safety (see Patent Document 1). This gas safety device includes an ultrasonic sensor, an ultrasonic flow rate measuring unit in which a circuit board including an ultrasonic sensor drive circuit is integrated, a pressure sensor for measuring the differential pressure between the supply pressure side and the atmospheric pressure, and pressure. When it is determined that the pressure measured by the sensor is abnormal, it is provided with a control unit that shuts off the flow path to stop the gas supply and a notification unit that reports.
特開２０１４－９８５６３号公報Japanese Unexamined Patent Publication No. 2014-98563
　本開示は、絶対圧圧力センサを用いてガスの供給圧を測定することに有効なガス保安装置を提供する。 The present disclosure provides a gas security device effective for measuring a gas supply pressure using an absolute pressure sensor.
　本開示におけるガス保安装置は、ガスを流す流路と、流路を流れるガスの流量を測定する流量計測部と、流路内部に配置されガスの絶対圧力を測定する第１の圧力センサと、流路外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、を備える。また、本開示におけるガス保安装置は、ガスのゲージ圧の真値を外部から取得するガス圧力真値取得部と、第１の圧力センサと第２の圧力センサの測定値の差と真値から測定値の補正値を算出し、第１の圧力センサと第２の圧力センサの測定値の差と補正値に基づきガス供給圧を算出するガス圧判定部と、を備える。さらに、本開示におけるガス保安装置は、流路を遮断する遮断弁と、流量計測部を制御すると共に、流量計測部で測定した流量やガス圧判定部で算出したガス供給圧から異常と判定した場合に遮断弁で流路を遮断する制御回路と、を備える。 The gas security device in the present disclosure includes a flow path through which gas flows, a flow rate measuring unit for measuring the flow rate of gas flowing through the flow path, a first pressure sensor arranged inside the flow path and measuring the absolute pressure of gas, and a first pressure sensor. A second pressure sensor, which is arranged outside the flow path and measures the absolute pressure of atmospheric pressure, is provided. Further, the gas safety device in the present disclosure is based on the difference and true value between the gas pressure true value acquisition unit that acquires the true value of the gas gauge pressure from the outside and the measured values of the first pressure sensor and the second pressure sensor. It is provided with a gas pressure determination unit that calculates a correction value of a measured value and calculates a gas supply pressure based on the difference between the measured values of the first pressure sensor and the second pressure sensor and the correction value. Further, the gas security device in the present disclosure controls the flow rate measuring unit and the shutoff valve that shuts off the flow path, and determines that the gas is abnormal from the flow rate measured by the flow rate measuring unit and the gas supply pressure calculated by the gas pressure determining unit. In some cases, a control circuit for shutting off the flow path with a shutoff valve is provided.
　また、本開示におけるガス保安装置は、ガスを流す流路と、流路を流れるガスの流量を測定する流量計測部と、流路内部に配置されガスの絶対圧力を測定する第１の圧力センサと、流路外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、とを備える。また、本開示におけるガス保安装置は、ガスの絶対圧力の真値を外部から取得するガス絶対圧力真値取得部と、大気の絶対圧力の真値を外部から取得する大気絶対圧力真値取得部と、を備える。また、本開示におけるガス保安装置は、第１の圧力センサの測定値とガスの絶対圧力の真値の差から第１の圧力センサの第１の補正値を算出し、第２の圧力センサの測定値と大気の絶対圧力の真値の差から第２の圧力センサの第２の補正値を算出し、第１の圧力センサの測定値と第２の圧力センサの測定値と第１の補正値と第２の補正値とからガス供給圧を算出するガス圧判定部を備える。さらに、本開示におけるガス保安装置は、流路を遮断する遮断弁と、流量計測部を制御すると共に、流量計測部で測定した流量やガス圧判定部で算出したガス供給圧から異常と判定した場合に遮断弁で流路を遮断する制御回路と、を備える。 Further, the gas security device in the present disclosure includes a flow path through which the gas flows, a flow rate measuring unit for measuring the flow rate of the gas flowing through the flow path, and a first pressure sensor arranged inside the flow path for measuring the absolute pressure of the gas. And a second pressure sensor that is arranged outside the flow path and measures the absolute pressure of atmospheric pressure. Further, the gas security device in the present disclosure includes a gas absolute pressure true value acquisition unit that acquires the true value of the absolute gas pressure from the outside, and an atmospheric absolute pressure true value acquisition unit that acquires the true value of the absolute atmospheric pressure from the outside. And. Further, the gas safety device in the present disclosure calculates the first correction value of the first pressure sensor from the difference between the measured value of the first pressure sensor and the true value of the absolute pressure of the gas, and of the second pressure sensor. The second correction value of the second pressure sensor is calculated from the difference between the measured value and the true value of the absolute pressure of the atmosphere, and the measured value of the first pressure sensor, the measured value of the second pressure sensor, and the first correction It is provided with a gas pressure determination unit that calculates the gas supply pressure from the value and the second correction value. Further, the gas security device in the present disclosure controls the flow rate measuring unit and the shutoff valve that shuts off the flow path, and determines that the gas is abnormal from the flow rate measured by the flow rate measuring unit and the gas supply pressure calculated by the gas pressure determining unit. In some cases, a control circuit for shutting off the flow path with a shutoff valve is provided.
　本開示は、ガス保安装置周辺が高温になってもガスが噴出することのないガス保安装置において、ガス供給圧の変化を精度よく測定することができる。 The present disclosure can accurately measure changes in gas supply pressure in a gas security device in which gas does not eject even when the temperature around the gas security device becomes high.
図１は、第１の実施の形態におけるガス保安装置の構成図である。FIG. 1 is a configuration diagram of a gas security device according to the first embodiment. 図２は、第１の実施の形態におけるガス保安システムの構成図である。FIG. 2 is a block diagram of the gas security system according to the first embodiment. 図３は、第１の実施の形態におけるガス保安システムの別の構成を示す構成図である。FIG. 3 is a configuration diagram showing another configuration of the gas security system according to the first embodiment. 図４は、第２の実施の形態におけるガス保安装置の構成図である。FIG. 4 is a block diagram of the gas security device according to the second embodiment. 図５は、第２の実施の形態におけるガス保安システムの構成図である。FIG. 5 is a block diagram of the gas security system according to the second embodiment. 図６は、第２の実施の形態におけるガス保安システムの別の構成を示す構成図である。FIG. 6 is a configuration diagram showing another configuration of the gas security system according to the second embodiment.
　（本開示の基礎となった知見等）
　ガス保安装置に内蔵された圧力センサはガスの圧力を大気圧基準として測定する差圧測定型であるため、ガスを圧力センサに導入する貫通孔を有しており、ガス保安装置周辺が非常に高温になった場合、圧力センサが変形することによって、貫通孔からガスが漏れ出す可能性がある。そこで、貫通孔が不要な構成として、大気圧を測定する絶対圧圧力センサとガスの圧力を測定する絶対圧圧力センサの測定値の差からガス供給圧の変化を測定する構成がある。 (Knowledge, etc. that was the basis of this disclosure)
Since the pressure sensor built into the gas security device is a differential pressure measurement type that measures the gas pressure based on the atmospheric pressure, it has a through hole for introducing the gas into the pressure sensor, and the area around the gas security device is very large. When the temperature becomes high, the pressure sensor may be deformed and gas may leak from the through hole. Therefore, as a configuration that does not require a through hole, there is a configuration in which the change in gas supply pressure is measured from the difference between the measured values of the absolute pressure pressure sensor that measures the atmospheric pressure and the absolute pressure pressure sensor that measures the gas pressure.
　しかしながら、絶対圧圧力センサは経時変化によって測定精度が低下するという課題を発明者らは発見し、その課題を解決するために、本開示の主題を構成するに至った。 However, the inventors have discovered a problem that the measurement accuracy of the absolute pressure / pressure sensor decreases with time, and in order to solve the problem, the subject of the present disclosure has been constructed.
　そこで本開示は、絶対圧圧力センサを用いてガスの供給圧を測定することに有効なガス保安装置を提供する。 Therefore, the present disclosure provides a gas security device effective for measuring the supply pressure of gas using an absolute pressure sensor.
　以下、図面を参照しながら、実施の形態を詳細に説明する。但し、必要以上に詳細な説明は省略する場合がある。例えば、既によく知られた事項の詳細説明、または、実質的に同一の構成に対する重複説明を省略する場合がある。これは、以下の説明が必要以上に冗長になるのを避け、当業者の理解を容易にするためである。 Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters or duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessarily redundant explanations below and to facilitate the understanding of those skilled in the art.
　なお、添付図面および以下の説明は、当業者が本開示を十分に理解するために提供されるのであって、これらにより請求の範囲に記載の主題を限定することを意図していない。 It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.
　（第１の実施の形態）
　以下、図１～３を用いて、第１の実施の形態を説明する。なお、本実施の形態においてガス保安装置をガスメータとして説明する。 (First Embodiment)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 3. In the present embodiment, the gas security device will be described as a gas meter.
　図１において、ガス保安装置であるガスメータ１００は、ガスが流れる流路１０１と、流路１０１を遮断する遮断弁１０２と、流路１０１に流れるガスの流量を計測する流量計測部１０３と、流量計測部１０３で計測した流量測定データを用いて、ガスの使用量を積算する制御回路１０４と、を備える。また、ガスメータ１００は、絶対圧力が測定できるガス側を計測する第１の圧力センサであるガス側絶対圧圧力センサ１０５と、大気圧側を計測する第２の圧力センサである大気側絶対圧圧力センサ１０６と、ガス雰囲気中に設置されている電子回路１０７と、外部からガス圧力の真値を取得するガス圧力真値取得部１０８と、を備える。さらに、ガスメータ１００は、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定した２つの絶対圧力値の差分とガス圧力真値取得部１０８で取得したゲージ圧の真値で補正値を算出し、２つの絶対圧力値と補正値からガス供給圧力を算出するガス圧力判定部１０９を備える。 In FIG. 1, the gas meter 100, which is a gas safety device, includes a flow path 101 through which gas flows, a shutoff valve 102 that shuts off the flow path 101, a flow rate measuring unit 103 that measures the flow rate of gas flowing in the flow path 101, and a flow rate. A control circuit 104 that integrates the amount of gas used by using the flow rate measurement data measured by the measuring unit 103 is provided. Further, the gas meter 100 includes a gas side absolute pressure pressure sensor 105 which is a first pressure sensor for measuring the gas side where the absolute pressure can be measured, and an atmospheric side absolute pressure pressure which is a second pressure sensor for measuring the atmospheric pressure side. It includes a sensor 106, an electronic circuit 107 installed in a gas atmosphere, and a gas pressure true value acquisition unit 108 that acquires the true value of the gas pressure from the outside. Further, the gas meter 100 is corrected by the difference between the two absolute pressure values measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106 and the true value of the gauge pressure acquired by the gas pressure true value acquisition unit 108. The gas pressure determination unit 109 is provided, which calculates the gas supply pressure from the two absolute pressure values and the correction value.
　制御回路１０４は、流量計測部１０３で計測された流量や、ガス圧力判定部１０９で求めたガス供給圧やその変化でガス漏れ等の異常がないかを判定し、異常と判定した場合は、遮断弁１０２で流路１０１を遮断して、ガスの供給を停止する。 The control circuit 104 determines whether or not there is an abnormality such as a gas leak based on the flow rate measured by the flow rate measuring unit 103, the gas supply pressure obtained by the gas pressure determining unit 109, or a change thereof, and if it is determined to be abnormal, the control circuit 104 determines. The shutoff valve 102 shuts off the flow path 101 to stop the gas supply.
　ガス側絶対圧圧力センサ１０５は、流路１０１の内部のガス雰囲気中に設置されている電子回路１０７上に電子部品として実装されており、制御回路１０４からの信号で流路１０１内のガスの絶対圧力を測定する。また、大気側絶対圧圧力センサ１０６は流路１０１の外部の大気側に設置されている制御回路１０４上に電子部品として実装されており、制御回路１０４からの信号で大気側の絶対圧力を測定する。 The gas-side absolute pressure pressure sensor 105 is mounted as an electronic component on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, and the signal from the control circuit 104 indicates that the gas in the flow path 101 Measure the absolute pressure. Further, the atmospheric side absolute pressure pressure sensor 106 is mounted as an electronic component on the control circuit 104 installed on the atmospheric side outside the flow path 101, and measures the atmospheric side absolute pressure with a signal from the control circuit 104. To do.
　次に、図２を用いて、具体的な動作説明を行う。図２は、本実施の形態におけるガスメータ１００を用いたガス保安システムを示すもので、ガス配管２００から分岐したガス配管２００ａ、２００ｂ、２００ｃ・・・のそれぞれにガスメータ１００が接続されており、ガスメータ１００よりも上流側のガス配管２００にはガスの供給圧を減圧する、圧力計測装置である中圧整圧器２０１が設置されている。この中圧整圧器２０１がガス圧力の真値を測定可能な圧力センサ（図示せず）を有する。ガスは中圧整圧器２０１により減圧されて下流側のガス配管２００を通じて各家庭に設置されたガスメータ１００を介して、ガス器具等に供給される。 Next, a specific operation explanation will be given with reference to FIG. FIG. 2 shows a gas safety system using the gas meter 100 in the present embodiment, in which the gas meter 100 is connected to each of the gas pipes 200a, 200b, 200c ... Branched from the gas pipe 200, and the gas meter A medium pressure regulator 201, which is a pressure measuring device, is installed in the gas pipe 200 on the upstream side of 100 to reduce the gas supply pressure. The medium pressure regulator 201 has a pressure sensor (not shown) capable of measuring the true value of the gas pressure. The gas is depressurized by the medium pressure regulator 201 and supplied to gas appliances and the like through a gas pipe 200 on the downstream side and a gas meter 100 installed in each household.
　中圧整圧器２０１にはガス圧を高精度に測定できるセンサ、例えばガスの圧力と大気圧の差圧（即ち、ゲージ圧）を測定する圧力センサを備えている。ガス配管２００においてガスの流れが殆ど無い場合、ガス配管２００内の圧力は均一となる。そこでガスの流れが殆ど無い状態において、圧力計測装置である中圧整圧器２０１とガスメータ１００がそれぞれ圧力を測定し、ガスメータ１００が中圧整圧器２０１からゲージ圧の真値ＰＧを、通信２０１ａ等を用いて取得することで、ガスメータ１００で測定されたガス供給圧を補正することができ、圧力測定精度を改善することが可能となる。 The medium pressure regulator 201 is provided with a sensor capable of measuring gas pressure with high accuracy, for example, a pressure sensor for measuring the differential pressure between gas pressure and atmospheric pressure (that is, gauge pressure). When there is almost no gas flow in the gas pipe 200, the pressure in the gas pipe 200 becomes uniform. Therefore, in a state where there is almost no gas flow, the medium pressure regulator 201 and the gas meter 100, which are pressure measuring devices, measure the pressure, respectively, and the gas meter 100 transmits the true value PG of the gauge pressure from the medium pressure regulator 201, communication 201a, etc. By acquiring using the above, the gas supply pressure measured by the gas meter 100 can be corrected, and the pressure measurement accuracy can be improved.
　即ち、ガスメータ１００において、ガス圧力判定部１０９は、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力Ｐｇと大気の絶対圧力Ｐａの差でガス供給圧Ｐ（＝Ｐｇ－Ｐａ）を算出する。しかしながら、経時変化によって絶対圧圧力センサの測定精度が低下するとガス圧力判定部１０９で算出されたガス供給圧Ｐは正確な値にならず、このガス供給圧Ｐに基づいて異常判定を行うと誤判定の可能性を生じる。本実施の形態によると、ガス圧力判定部１０９で算出されたガス供給圧Ｐを中圧整圧器２０１から取得したガス供給圧の真値ＰＧとの差分を補正値Ｐｃとして補正することで正確なガス供給圧を算出することができる。 That is, in the gas meter 100, the gas pressure determination unit 109 determines the gas supply pressure P by the difference between the absolute pressure Pg of the gas measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106 and the absolute pressure Pa of the atmosphere. (= Pg-Pa) is calculated. However, if the measurement accuracy of the absolute pressure pressure sensor decreases due to changes over time, the gas supply pressure P calculated by the gas pressure determination unit 109 will not be an accurate value, and it will be erroneous to make an abnormality determination based on this gas supply pressure P. It raises the possibility of judgment. According to the present embodiment, the difference between the gas supply pressure P calculated by the gas pressure determination unit 109 and the true value PG of the gas supply pressure acquired from the medium pressure regulator 201 is corrected as the correction value Pc to be accurate. The gas supply pressure can be calculated.
　なお、ガスメータ１００は、図示していない記憶装置等に補正値Ｐｃを保存しておくことで、ガスの使用中等で中圧整圧器２０１からガス供給圧の真値ＰＧが取得できない場合でも補正を行うことができる。更に、ガスメータ１００は、ガス供給圧の真値ＰＧが取得できた場合、その真値ＰＧに基づく新たな補正値Ｐｃを記憶装置等に保存することで常に最新の補正値Ｐｃに更新でき、経時変化に対応することができる。 By storing the correction value Pc in a storage device or the like (not shown), the gas meter 100 corrects even when the true value PG of the gas supply pressure cannot be obtained from the medium pressure regulator 201 due to the use of gas or the like. It can be carried out. Further, when the true value PG of the gas supply pressure can be acquired, the gas meter 100 can always update to the latest correction value Pc by storing a new correction value Pc based on the true value PG in a storage device or the like, and over time. Can respond to changes.
　図３は、本実施の形態におけるガスメータ１００を用いたガス保安システムの別の構成を示すもので、ガス配管２００上に接続されたガスメータの内の１つのガスメータＡ２０２が、ガス供給圧のゲージ圧の真値ＰＧを測定可能な場合を示す図である。ガスメータＡ２０２は、第２のガス保安装置であり、ガス圧を高精度に測定できるセンサ、例えば、ガス圧側と大気圧の差圧を測定する圧力センサを備えており、定期的に圧力の測定精度が校正されている。 FIG. 3 shows another configuration of the gas safety system using the gas meter 100 in the present embodiment, in which one gas meter A202 among the gas meters connected on the gas pipe 200 has a gauge pressure of the gas supply pressure. It is a figure which shows the case where the true value PG of is measurable. The gas meter A202 is a second gas safety device, and is provided with a sensor capable of measuring gas pressure with high accuracy, for example, a pressure sensor for measuring the differential pressure between the gas pressure side and the atmospheric pressure, and periodically has a pressure measurement accuracy. Has been calibrated.
　そして、図２を用いた説明と同様にガスの流れが殆ど無い状態において、第２のガス保安装置であるガスメータＡ２０２とガスメータ１００がガス供給圧をそれぞれ測定し、ガスメータ１００がガスメータＡ２０２からガス供給圧のゲージ圧の真値ＰＧを、通信２０２ａ等を用いて取得することで、ガスメータ１００の圧力測定精度を改善することが可能となる。 Then, as in the explanation using FIG. 2, in a state where there is almost no gas flow, the gas meter A202 and the gas meter 100, which are the second gas safety devices, measure the gas supply pressure, respectively, and the gas meter 100 supplies the gas from the gas meter A202. By acquiring the true value PG of the gauge pressure of the pressure using communication 202a or the like, it is possible to improve the pressure measurement accuracy of the gas meter 100.
　なお、第２のガス保安装置であるガスメータＡ２０２は、ガスメータ１００と同じ構成とし、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６を定期的に校正することで、測定で得られた２つの絶対圧の差からゲージ圧の真値ＰＧを算出できるようにしても良い。 The gas meter A202, which is the second gas safety device, has the same configuration as the gas meter 100, and was obtained by measurement by periodically calibrating the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106. The true value PG of the gauge pressure may be calculated from the difference between the two absolute pressures.
　以上のように、本実施の形態においては、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力と大気の絶対圧力の差でガス供給圧を測定するガスメータ１００において、ガス供給圧の真値ＰＧを外部から取得する。この構成により、補正値を得ることができ、２つの絶対圧圧力センサの経時変化による誤差に対する測定精度の改善ができるとともに、差圧測定型の圧力センサを用いる場合に必要な貫通孔が不要となる。そのため、ガス保安装置の周囲が高温になってもガスが噴出することを防止でき、より安全性の高いガス保安装置が実現できる。 As described above, in the present embodiment, the gas meter that measures the gas supply pressure by the difference between the absolute pressure of the gas and the absolute pressure of the atmosphere measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106. At 100, the true value PG of the gas supply pressure is acquired from the outside. With this configuration, a correction value can be obtained, the measurement accuracy for errors due to changes over time of the two absolute pressure and pressure sensors can be improved, and the through hole required when using a differential pressure measurement type pressure sensor is not required. Become. Therefore, it is possible to prevent gas from being ejected even when the temperature around the gas security device becomes high, and a gas security device with higher safety can be realized.
　なお、本実施の形態において、流量計測部を超音波流量計測として使用しても同等なことができることは言うまでもない。 Needless to say, in the present embodiment, the same can be achieved even if the flow rate measuring unit is used for ultrasonic flow rate measurement.
　なお、本実施の形態において、ガス側絶対圧圧力センサ１０５を流路１０１の内部のガス雰囲気中に設置されている電子回路１０７上に実装する構成で説明したが、流路の内部であれば何処に実装してもよい。また、大気側絶対圧圧力センサ１０６を流路１０１の外部の大気側に設置されている制御回路１０４上に実装する構成で説明したが、大気圧を測定できれば実装する場所に制限は無い。 In the present embodiment, the gas side absolute pressure pressure sensor 105 has been described as being mounted on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, but if it is inside the flow path, It can be implemented anywhere. Further, although the configuration has been described in which the atmospheric pressure absolute pressure sensor 106 is mounted on the control circuit 104 installed on the atmospheric side outside the flow path 101, there is no limitation on the mounting location as long as the atmospheric pressure can be measured.
　（第２の実施の形態）
　以下、第２の実施の形態について、図４を用いて説明する。なお、本実施の形態においてガス保安装置をガスメータとして説明する。第１の実施の形態において、説明した同一の構成要素については同一番号で示す。 (Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIG. In the present embodiment, the gas security device will be described as a gas meter. In the first embodiment, the same components described will be designated by the same number.
　図４において、ガス保安装置であるガスメータ３００は、ガスが流れる流路１０１と、流路１０１を遮断する遮断弁１０２と、流路１０１に流れるガスの流量を計測する流量計測部１０３と、流量計測部１０３で計測した流量測定データを用いて、ガスの使用量を積算する制御回路３０４と、を備える。また、ガスメータ３００は、絶対圧力が測定できるガス側を計測する第１の圧力センサであるガス側絶対圧圧力センサ１０５と、大気圧側を計測する第２の圧力センサである大気側絶対圧圧力センサ１０６と、を備える。さらに、ガス雰囲気中に設置されている電子回路１０７と、外部からガス供給圧の絶対圧力の真値を取得するガス絶対圧力真値取得部３０１と、外部から大気の絶対圧力の真値を取得する大気絶対圧力真値取得部３０２と、ガス圧力判定部１０９と、を備える。 In FIG. 4, the gas meter 300, which is a gas safety device, includes a flow path 101 through which gas flows, a shutoff valve 102 that shuts off the flow path 101, a flow rate measuring unit 103 that measures the flow rate of gas flowing in the flow path 101, and a flow rate. A control circuit 304 that integrates the amount of gas used by using the flow rate measurement data measured by the measuring unit 103 is provided. Further, the gas meter 300 includes a gas side absolute pressure pressure sensor 105 which is a first pressure sensor for measuring the gas side where the absolute pressure can be measured, and an atmospheric side absolute pressure pressure which is a second pressure sensor for measuring the atmospheric pressure side. It includes a sensor 106. Further, the electronic circuit 107 installed in the gas atmosphere, the gas absolute pressure true value acquisition unit 301 that acquires the true value of the absolute pressure of the gas supply pressure from the outside, and the gas absolute pressure true value acquisition unit 301 that acquires the true value of the absolute pressure of the atmosphere from the outside. It is provided with an atmospheric absolute pressure true value acquisition unit 302 and a gas pressure determination unit 109.
　ガス圧力判定部１０９は、ガス側絶対圧圧力センサ１０５で測定した絶対圧力とガス絶対圧力真値取得部３０１で取得したガス側の絶対圧力の真値からガス側補正値を算出する。また、ガス圧力判定部１０９は、大気側絶対圧圧力センサ１０６で測定した絶対圧力と大気絶対圧力真値取得部３０２で取得した大気側の絶対圧力の真値から大気側補正値を算出する。さらに、ガス圧力判定部１０９は、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定したぞれぞれの絶対圧力をガス側補正値と大気側補正値で補正し、その差分でガス供給圧を算出する。 The gas pressure determination unit 109 calculates the gas side correction value from the absolute pressure measured by the gas side absolute pressure pressure sensor 105 and the true value of the gas side absolute pressure acquired by the gas absolute pressure true value acquisition unit 301. Further, the gas pressure determination unit 109 calculates the atmospheric side correction value from the absolute pressure measured by the atmospheric side absolute pressure pressure sensor 106 and the true value of the atmospheric side absolute pressure acquired by the atmospheric absolute pressure true value acquisition unit 302. Further, the gas pressure determination unit 109 corrects each absolute pressure measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106 with the gas side correction value and the atmosphere side correction value, and the difference thereof. Calculate the gas supply pressure with.
　制御回路３０４は、流量計測部１０３で計測された流量や、ガス圧力判定部１０９で求めたガス供給圧やその変化からガス漏れ等の異常がないかを判定し、異常と判定した場合は、遮断弁１０２で流路１０１を遮断して、ガスの供給を停止する。 The control circuit 304 determines whether there is an abnormality such as a gas leak from the flow rate measured by the flow rate measuring unit 103, the gas supply pressure obtained by the gas pressure determining unit 109, or a change thereof, and if it is determined to be abnormal, the control circuit 304 determines. The shutoff valve 102 shuts off the flow path 101 to stop the gas supply.
　ガス側絶対圧圧力センサ１０５は、流路１０１の内部のガス雰囲気中に設置されている電子回路１０７上に電子部品として実装されており、制御回路１０４からの信号で流路１０１の内部のガスの絶対圧力を測定する。また、大気側絶対圧圧力センサ１０６は、流路１０１の外部の大気側に設置されている制御回路１０４上に電子部品として実装されており、制御回路１０４からの信号で大気側の絶対圧力を測定する。 The gas-side absolute pressure pressure sensor 105 is mounted as an electronic component on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, and the gas inside the flow path 101 is received by a signal from the control circuit 104. Measure the absolute pressure of. Further, the atmospheric side absolute pressure pressure sensor 106 is mounted as an electronic component on the control circuit 104 installed on the atmospheric side outside the flow path 101, and the absolute pressure on the atmospheric side is measured by a signal from the control circuit 104. taking measurement.
　次に、図５を用いて、具体的な動作説明を行う。図５は、本実施の形態におけるガスメータ１００を用いたガス保安システムを示す。図に示すように、ガス配管２００から分岐したガス配管２００ａ、２００ｂ、２００ｃ・・・のそれぞれにガスメータ３００が接続されており、ガスメータ１００よりも上流側のガス配管２００にはガスの供給圧を減圧する、圧力計測装置である中圧整圧器４０１が設置されている。この中圧整圧器４０１がガス供給圧と大気圧の絶対圧力の真値を測定可能な絶対圧圧力センサ（図示せず）を有する。ガスは中圧整圧器４０１により減圧されて下流側のガス配管２００を通じて各家庭に設置されたガスメータ３００を介して、ガス器具等に供給される。 Next, a specific operation explanation will be given with reference to FIG. FIG. 5 shows a gas security system using the gas meter 100 in the present embodiment. As shown in the figure, a gas meter 300 is connected to each of the gas pipes 200a, 200b, 200c ... Branched from the gas pipe 200, and the gas supply pressure is applied to the gas pipe 200 on the upstream side of the gas meter 100. A medium pressure regulator 401, which is a pressure measuring device for reducing the pressure, is installed. The medium pressure regulator 401 has an absolute pressure sensor (not shown) capable of measuring the true values of the gas supply pressure and the absolute pressure of atmospheric pressure. The gas is decompressed by the medium pressure regulator 401 and supplied to gas appliances and the like through the gas pipe 200 on the downstream side and the gas meter 300 installed in each household.
　圧力計測装置である中圧整圧器４０１は、ガス供給圧の絶対圧力と大気圧の絶対圧力を高精度に測定できる絶対圧圧力センサを備え、定期的に測定精度が校正されている。ガス配管２００においてガスの流れが殆ど無い場合、ガス配管２００内の圧力は均一となる。そこでガスの流れが殆ど無い状態において、ガス供給圧と大気圧の絶対圧力を圧力計測装置である中圧整圧器４０１とガスメータ３００がそれぞれ測定し、ガスメータ３００が中圧整圧器２０１からガス供給圧の絶対圧力の真値ＰＡｇと大気の絶対圧力の真値ＰＡａを、通信４０１ａ等を用いて取得する。この構成により、ガスメータ３００のガス側絶対圧圧力センサ１０５による測定値と大気側絶対圧圧力センサ１０６による測定値を補正することができ、圧力測定精度を改善することが可能となる。 The medium pressure regulator 401, which is a pressure measuring device, is equipped with an absolute pressure pressure sensor that can measure the absolute pressure of the gas supply pressure and the absolute pressure of the atmospheric pressure with high accuracy, and the measurement accuracy is calibrated regularly. When there is almost no gas flow in the gas pipe 200, the pressure in the gas pipe 200 becomes uniform. Therefore, in a state where there is almost no gas flow, the gas supply pressure and the absolute pressure of the atmospheric pressure are measured by the medium pressure regulator 401 and the gas meter 300, which are pressure measuring devices, respectively, and the gas meter 300 measures the gas supply pressure from the medium pressure regulator 201. The true value PAg of the absolute pressure of the above and the true value PAa of the absolute pressure of the atmosphere are acquired by using communication 401a or the like. With this configuration, the measured value by the gas side absolute pressure pressure sensor 105 and the measured value by the atmospheric side absolute pressure pressure sensor 106 of the gas meter 300 can be corrected, and the pressure measurement accuracy can be improved.
　即ち、ガスメータ３００において、ガス圧力判定部１０９は、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力Ｐｇと大気の絶対圧力Ｐａの差でガス供給圧Ｐを算出する。しかしながら、経時変化によって絶対圧圧力センサの測定精度が低下するとガス圧力判定部１０９で算出されたガス供給圧Ｐ（＝Ｐｇ－ｐａ）は正確な値にならず、このガス供給圧Ｐに基づいて異常判定を行うと誤判定の可能性を生じる。本実施の形態によると、ガス側絶対圧圧力センサ１０５で測定される絶対圧力と中圧整圧器４０１から取得したガス供給圧の絶対圧力の真値ＰＡｇとの差分をガス側補正値Ｐｇｃとして補正する。さらに、大気側絶対圧圧力センサ１０６で測定される絶対圧力を中圧整圧器４０１から取得した大気圧の絶対圧力の真値ＰＡａとの差分を大気側補正値Ｐａｃとして補正することで正確なガス供給圧を算出することができる。 That is, in the gas meter 300, the gas pressure determination unit 109 determines the gas supply pressure P by the difference between the absolute pressure Pg of the gas measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106 and the absolute pressure Pa of the atmosphere. Is calculated. However, if the measurement accuracy of the absolute pressure pressure sensor decreases due to changes over time, the gas supply pressure P (= Pg-pa) calculated by the gas pressure determination unit 109 does not become an accurate value, and is based on this gas supply pressure P. If an abnormality is determined, there is a possibility of erroneous determination. According to the present embodiment, the difference between the absolute pressure measured by the gas side absolute pressure sensor 105 and the true value PAg of the absolute pressure of the gas supply pressure acquired from the medium pressure regulator 401 is corrected as the gas side correction value Pgc. To do. Further, the difference between the absolute pressure measured by the atmospheric absolute pressure sensor 106 and the true value PAa of the absolute pressure of the atmospheric pressure acquired from the medium pressure regulator 401 is corrected as the atmospheric correction value Pac to obtain an accurate gas. The supply pressure can be calculated.
　なお、ガスメータ３００は、図示していない記憶装置等にガス側補正値Ｐｇｃ、大気側補正値Ｐａｃを保存しておくことで、ガスの使用中等で中圧整圧器４０１からガス供給圧の絶対圧力の真値ＰＡｇ、および大気圧の絶対圧力のＰＡａが取得できない場合でも補正を行うことができる。更に、ガスメータ３００は、真値ＰＡｇ、ＰＡａが取得できた場合、その真値ＰＡｇ、ＰＡａに基づく新たな補正値Ｐｇｃ、Ｐａｃを記憶装置等に保存することで、常に最新の補正値Ｐｇｃ、Ｐａｃに更新でき、経時変化に対応することができる。 The gas meter 300 stores the gas side correction value Pgc and the atmosphere side correction value Pac in a storage device or the like (not shown), so that the absolute pressure of the gas supply pressure from the medium pressure regulator 401 during the use of gas or the like. Even if the true value PAg of and the PAa of the absolute pressure of atmospheric pressure cannot be obtained, the correction can be performed. Further, when the true values PAg and PAa can be obtained, the gas meter 300 always stores the latest correction values Pgc and Pac in a storage device or the like based on the true values PAg and PAa. It can be updated to and can respond to changes over time.
　図６は、本実施の形態におけるガスメータ３００を用いたガス保安システムの別の構成を示すもので、ガス配管２００上に、ガス供給圧と大気圧の絶対圧力の真値ＰＡｇ、ＰＡａが測定可能なガスメータＢ４０２が存在する場合の図である。ガスメータＢ４０２は、第２のガス保安装置であり、ガス供給圧と大気圧を高精度に測定できる絶対圧センサを有しているもので、例えば定期的に圧力精度を校正しているものとする。 FIG. 6 shows another configuration of the gas safety system using the gas meter 300 in the present embodiment, and the true values PAg and PAa of the gas supply pressure and the absolute pressure of the atmospheric pressure can be measured on the gas pipe 200. It is a figure when there is a gas meter B402. The gas meter B402 is a second gas safety device and has an absolute pressure sensor capable of measuring gas supply pressure and atmospheric pressure with high accuracy. For example, it is assumed that the pressure accuracy is calibrated regularly. ..
　そして、図５を用いた説明と同様にガスの流れが殆ど無い状態において、ガス圧力の真値を測定可能な、第２のガス保安装置であるガスメータＢ４０２と、ガスメータ３００が絶対圧力をそれぞれ測定し、ガスメータ３００がガスメータＢ４０２からガスの絶対圧力の真値ＰＡｇと大気の絶対圧力の真値ＰＡａを、通信４０２ａ等を用いて取得することで、ガスメータ３００の圧力測定精度を改善することが可能となる。 Then, as in the explanation using FIG. 5, the gas meter B402 and the gas meter 300, which are the second gas safety devices capable of measuring the true value of the gas pressure in a state where there is almost no gas flow, measure the absolute pressure, respectively. Then, the gas meter 300 can improve the pressure measurement accuracy of the gas meter 300 by acquiring the true value PAg of the absolute pressure of the gas and the true value PAa of the absolute pressure of the atmosphere from the gas meter B402 by using the communication 402a or the like. It becomes.
　なお、第２のガス保安装置であるガスメータＢ４０２は、ガスメータ３００と同じ構成とし、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６を定期的に校正することで、常に真値ＰＡｇ、ＰＡａを計測できるようにしても良い。 The gas meter B402, which is the second gas safety device, has the same configuration as the gas meter 300, and by periodically calibrating the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106, the true value PAg is always set. PAa may be measured.
　以上のように、本実施の形態においては、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力と大気の絶対圧力の差でガス供給圧を測定するガスメータ３００において、ガスと大気の絶対圧力の真値ＰＡｇ、ＰＡａを外部から取得する。この構成により、２つの絶対圧圧力センサの経時変化による誤差に対する測定精度の改善ができるとともに、差圧測定型の圧力センサを用いる場合に必要な貫通孔が不要となる。そのため、ガス保安装置の周囲が高温になってもガスが噴出することを防止でき、より安全性の高いガス保安装置が実現できる。 As described above, in the present embodiment, the gas meter that measures the gas supply pressure by the difference between the absolute pressure of the gas and the absolute pressure of the atmosphere measured by the gas side absolute pressure pressure sensor 105 and the atmosphere side absolute pressure pressure sensor 106. At 300, the true values PAg and PAa of the absolute pressures of gas and atmosphere are acquired from the outside. With this configuration, it is possible to improve the measurement accuracy for errors due to changes over time of the two absolute pressure and pressure sensors, and it is not necessary to have a through hole required when using a differential pressure measurement type pressure sensor. Therefore, it is possible to prevent gas from being ejected even when the temperature around the gas security device becomes high, and a gas security device with higher safety can be realized.
　なお、本実施の形態において、大気絶対圧力は気象情報など他の真値を有する装置から取得できることは言うまでもない。 Needless to say, in the present embodiment, the absolute atmospheric pressure can be obtained from another device having a true value such as meteorological information.
　なお、本実施の形態において、流量計測部を超音波流量計測として使用しても同等なことができることは言うまでもない。 Needless to say, in the present embodiment, the same can be achieved even if the flow rate measuring unit is used for ultrasonic flow rate measurement.
　なお、本実施の形態において、ガス側絶対圧圧力センサ１０５を流路１０１の内部のガス雰囲気中に設置されている電子回路１０７上に実装する構成で説明したが、流路内であれば何処に実装してもよいことはいうまでも無い。また、大気側絶対圧圧力センサ１０６を流路１０１の外部の大気側に設置されている制御回路１０４上に実装する構成で説明したが、大気圧を測定できれば実装する場所に制限は無い。 In the present embodiment, the gas side absolute pressure pressure sensor 105 has been described as being mounted on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101, but anywhere in the flow path. Needless to say, it may be implemented in. Further, although the configuration has been described in which the atmospheric pressure absolute pressure sensor 106 is mounted on the control circuit 104 installed on the atmospheric side outside the flow path 101, there is no limitation on the mounting location as long as the atmospheric pressure can be measured.
　本開示におけるガス保安装置は、周囲が高温になっても圧力センサ用の貫通穴からガスが噴出することを防止できるため、より安全性を向上できるだけでなく、より安価に提供でき、一般家庭用及び業務用ガスメータ等の用途に適用できる。 Since the gas security device in the present disclosure can prevent gas from being ejected from the through hole for the pressure sensor even when the surrounding temperature becomes high, it can not only improve safety but also provide it at a lower cost, and can be provided for general household use. And can be applied to applications such as commercial gas meters.
　１００、３００　ガスメータ（ガス保安装置）
　１０１　流路
　１０２　遮断弁
　１０３　流量計測部
　１０４、３０４　制御回路
　１０５　ガス側絶対圧圧力センサ（第１の圧力センサ）
　１０６　大気側絶対圧圧力センサ（第２の圧力センサ）
　１０７　電子回路
　１０８　ガス圧力真値取得部
　１０９　ガス圧力判定部
　２００、２００ａ、２００ｂ、２００ｃ　ガス配管(配管）
　２０１、４０１　中圧整圧器（圧力計測装置）
　２０２　ガスメータＡ（第２のガス保安装置）
　４０２　ガスメータＢ（第２のガス保安装置）
　３０１　ガス絶対圧力真値取得部
　３０２　大気絶対圧力真値取得部 100, 300 gas meter (gas security device)
101 Flow path 102 Shutoff valve 103 Flow rate measurement unit 104, 304 Control circuit 105 Gas side absolute pressure pressure sensor (first pressure sensor)
106 Atmospheric side absolute pressure pressure sensor (second pressure sensor)
107 Electronic circuit 108 Gas pressure true value acquisition unit 109 Gas pressure determination unit 200, 200a, 200b, 200c Gas piping (piping)
201, 401 Medium pressure regulator (pressure measuring device)
202 Gas meter A (second gas security device)
402 Gas meter B (second gas security device)
301 Gas absolute pressure true value acquisition unit 302 Atmospheric absolute pressure true value acquisition unit

Claims (6)

  1. ガスを流す流路と、
    前記流路を流れるガスの流量を測定する流量計測部と、
    前記流路の内部に配置され前記ガスの絶対圧力を測定する第１の圧力センサと、
    前記流路の外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、
    前記ガスのゲージ圧の真値を外部から取得するガス圧力真値取得部と、
    前記第１の圧力センサと前記第２の圧力センサの測定値の差と前記真値から前記測定値の補正値を算出し、前記第１の圧力センサと前記第２の圧力センサの測定値の差と前記補正値に基づきガス供給圧を算出するガス圧判定部と、
    前記流路を遮断する遮断弁と、
    前記流量計測部を制御すると共に、前記流量計測部で測定した流量や前記ガス圧判定部で算出したガス供給圧から異常と判定した場合に前記遮断弁で前記流路を遮断する制御回路と、
    を備えたガス保安装置。     The flow path for gas flow and
    A flow rate measuring unit that measures the flow rate of gas flowing through the flow path,
    A first pressure sensor arranged inside the flow path and measuring the absolute pressure of the gas,
    A second pressure sensor located outside the flow path and measuring the absolute pressure of atmospheric pressure,
    A gas pressure true value acquisition unit that acquires the true value of the gas gauge pressure from the outside,
    A correction value of the measured value is calculated from the difference between the measured values of the first pressure sensor and the second pressure sensor and the true value, and the measured values of the first pressure sensor and the second pressure sensor are calculated. A gas pressure determination unit that calculates the gas supply pressure based on the difference and the correction value,
    A shutoff valve that shuts off the flow path and
    A control circuit that controls the flow rate measuring unit and shuts off the flow path with the shutoff valve when an abnormality is determined from the flow rate measured by the flow rate measuring unit and the gas supply pressure calculated by the gas pressure determining unit.
    Gas security device equipped with.
  2. ガスを流す配管と、
    前記配管上に設置されたガス供給圧のゲージ圧の真値を測定可能な圧力計測装置と、
    前記配管上に設置された請求項１に記載のガス保安装置と、
    からなり、前記ガス圧力真値取得部は、前記圧力計測装置から前記真値を取得するガス保安システム。     Piping for gas flow and
    A pressure measuring device that can measure the true value of the gauge pressure of the gas supply pressure installed on the pipe,
    The gas safety device according to claim 1 installed on the pipe and
    The gas pressure true value acquisition unit is a gas safety system that acquires the true value from the pressure measuring device.
  3. ガスを流す配管と、
    前記配管上に設置され、ガス供給圧のゲージ圧の真値を測定可能な第２のガス保安装置と、
    前記配管上に設置された請求項１に記載のガス保安装置と、
    からなり、前記ガス圧力真値取得部は、前記第２のガス保安装置から前記真値を取得するガス保安システム。     Piping for gas flow and
    A second gas safety device installed on the pipe and capable of measuring the true value of the gauge pressure of the gas supply pressure,
    The gas safety device according to claim 1 installed on the pipe and
    The gas pressure true value acquisition unit is a gas security system that acquires the true value from the second gas security device.
  4. ガスを流す流路と、
    前記流路を流れるガスの流量を測定する流量計測部と、
    前記流路の内部に配置され前記ガスの絶対圧力を測定する第１の圧力センサと、
    前記流路の外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、
    前記ガスの絶対圧力の真値を外部から取得するガス絶対圧力真値取得部と、
    大気の絶対圧力の真値を外部から取得する大気絶対圧力真値取得部と、
    前記第１の圧力センサの測定値と前記ガスの絶対圧力の真値の差から前記第１の圧力センサの第１の補正値を算出し、前記第２の圧力センサの測定値と前記大気の絶対圧力の真値の差から前記第２の圧力センサの第２の補正値を算出し、前記第１の圧力センサの測定値と前記第２の圧力センサの測定値と前記第１の補正値と前記第２の補正値とからガス供給圧を算出するガス圧判定部と、
    前記流路を遮断する遮断弁と、
    前記流量計測部を制御すると共に、前記流量計測部で測定した流量や前記ガス圧判定部で算出したガス供給圧から異常と判定した場合に前記遮断弁で前記流路を遮断する制御回路と、
    を備えたガス保安装置。     The flow path for gas flow and
    A flow rate measuring unit that measures the flow rate of gas flowing through the flow path,
    A first pressure sensor arranged inside the flow path and measuring the absolute pressure of the gas,
    A second pressure sensor located outside the flow path and measuring the absolute pressure of atmospheric pressure,
    A gas absolute pressure true value acquisition unit that acquires the true value of the gas absolute pressure from the outside,
    The atmospheric absolute pressure true value acquisition unit that acquires the true value of the atmospheric absolute pressure from the outside,
    The first correction value of the first pressure sensor is calculated from the difference between the measured value of the first pressure sensor and the true value of the absolute pressure of the gas, and the measured value of the second pressure sensor and the atmosphere. The second correction value of the second pressure sensor is calculated from the difference between the true values of the absolute pressures, and the measurement value of the first pressure sensor, the measurement value of the second pressure sensor, and the first correction value are calculated. And the gas pressure determination unit that calculates the gas supply pressure from the second correction value,
    A shutoff valve that shuts off the flow path and
    A control circuit that controls the flow rate measuring unit and shuts off the flow path with the shutoff valve when an abnormality is determined from the flow rate measured by the flow rate measuring unit and the gas supply pressure calculated by the gas pressure determination unit.
    Gas security device equipped with.
  5. ガスを流す配管と、
    前記配管上に設置され、ガス供給圧と大気圧の絶対圧力の真値を測定可能な圧力計測装置と、
    前記配管上に設置された請求項４に記載のガス保安装置と、
    からなり、前記ガス絶対圧力真値取得部と前記大気絶対圧力真値取得部は、前記圧力計測装置から前記ガス供給圧の絶対圧力の真値と前記大気の絶対圧力の真値を取得するガス保安システム。     Piping for gas flow and
    A pressure measuring device installed on the pipe that can measure the true value of the gas supply pressure and the absolute pressure of atmospheric pressure,
    The gas safety device according to claim 4 installed on the pipe and
    The gas absolute pressure true value acquisition unit and the atmospheric absolute pressure true value acquisition unit are gas that acquires the true value of the absolute pressure of the gas supply pressure and the true value of the absolute pressure of the atmosphere from the pressure measuring device. Security system.
  6. ガスを流す配管と、
    前記配管上に設置され、ガス供給圧と大気圧の絶対圧力の測定可能な第２のガス保安装置と、
    前記配管上に設置された請求項４に記載のガス保安装置と、
    からなり、前記ガス絶対圧力真値取得部と前記大気絶対圧力真値取得部は、前記第２のガス保安装置から前記ガス供給圧の絶対圧力の真値と前記大気の絶対圧力の真値を取得するガス保安システム。     Piping for gas flow and
    A second gas safety device installed on the pipe and capable of measuring the gas supply pressure and the absolute pressure of atmospheric pressure,
    The gas safety device according to claim 4 installed on the pipe and
    The gas absolute pressure true value acquisition unit and the atmospheric absolute pressure true value acquisition unit obtain the true value of the absolute pressure of the gas supply pressure and the true value of the absolute pressure of the atmosphere from the second gas security device. Gas security system to acquire.
PCT/JP2020/019154 2019-05-23 2020-05-13 Gas safety device and gas safety system WO2020235423A1 (en)

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