JP4144482B2 - Gas shut-off device - Google Patents

Description

  The present invention relates to a gas shut-off device for ensuring safety in use of gas when a gas is used after a gas meter.

  Gas meters that are already in practical use monitor gas flow rates and the like. When a large amount of gas that is different from the normal usage state flows, or when gas flows continuously for a long time, or when an abnormality such as an earthquake occurs, the control unit determines that it is in an abnormal state, It is configured to prevent an accident in advance by supplying a current to the shut-off valve to stop the gas supply.

  This control can be remotely operated from the outside through a telephone line or the like.

  In addition, some control units of conventional gas shut-off devices prevent heat generation and ignition of the circuit and power supply, and when a short circuit occurs temporarily, the current is cut off only during that time to restore the circuit to normal. (See Patent Document 1).

  FIG. 3 includes a shut-off valve 1 that shuts off the gas passage, a power source 2 that supplies power by a battery, a microcomputer 3 that controls the operation of the shut-off valve, and a circuit unit 4.

Further, the resistance value is usually small but the resistance value increases in the case of overcurrent, and the resistance value is restored to the original state when it is in a normal use state, and the printed circuit board on which the microcomputer 3, the circuit unit 4, and the protection element 5 are mounted. 6.
JP-A-11-166723

  However, in the conventional configuration, gas can be used even if the control unit is inoperable due to overcurrent, and the control unit is continuously used even if the circuit and parts are abnormal due to overcurrent. Therefore, there was a problem that gas can be used.

  The present invention solves the conventional problems, and if the control unit is in an overcurrent state and inoperable, the gas is immediately shut off according to the magnitude of the current value if the current value is within a predetermined range, or If the circuit is diagnosed and there is no problem, it is possible to select whether to use the gas continuously.

In addition, the circuit unit and power supply are diagnosed by overcurrent generated due to short circuit, etc., and gas can be shut off when there is an abnormality, and if there is no abnormality, gas can be used continuously. It is an object to provide a gas shut-off device that improves safety and safety in use of gas.

  In order to solve the above-described conventional problems, the gas cutoff device of the present invention has a current detection unit provided separately from the control unit, so that an accurate current value is measured even in an abnormal state of the control unit, and whether or not the gas cutoff is possible. Since it can be judged, it aims at providing the gas interruption | blocking apparatus which improves the convenience on the gas use of a gas company, and ensuring safety | security ensuring on gas use.

According to the present invention, by providing the current detection unit separately from the control unit, it is possible to measure an accurate current value even in the abnormal state of the control unit and determine whether or not the gas can be shut off.

The present invention includes a flow rate detection unit that detects a gas flow rate, a shut-off valve that is disposed in the gas flow path and shuts off the gas, a valve drive unit that drives the shut-off valve by a shut-off signal, and a signal from the flow rate detection unit The flow rate calculation unit for calculating the flow rate by the control unit, the control unit for controlling the valve drive unit and the flow rate calculation unit, the current consumption of the control unit is detected, and the current value is output when the current consumption is not within a predetermined range A current detection unit; a self-diagnosis unit for self-diagnosis of a circuit abnormality of the control unit when the current value from the current detection unit is less than a predetermined value; and a storage unit for storing the current value from the current detection unit; A comparison unit that compares a measured current consumption value with a plurality of past consumption current values stored in the storage unit, and outputs a cut-off signal when the difference is within a predetermined range, In the gas shut-off device, the current detection part is installed separately from the control part. In, also measured the accurate current value in the control unit abnormal state, it is possible to determine whether the gas shut-off
Further, when the circuit is in an abnormal state, the gas can be immediately shut off to ensure safety in use of the gas from the abnormal circuit operation.

  Furthermore, even when there is no abnormality in the circuit, when a current consumption in a certain range is consumed during a certain period, by shutting off the gas, safety in using the gas can be ensured before the battery is consumed.

In addition, it has a communication unit for transmitting the diagnosis result of the self-diagnosis unit via the communication circuit, and the abnormal part is safe in terms of gas use during the period until the replacement of the control unit due to the detected abnormal state. By allowing the gas to be used continuously where there is no problem, the convenience in using the gas can be achieved.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram of a gas cutoff device according to Embodiment 1 of the present invention. As shown in FIG. 1, a flow rate detection unit 1 that detects a gas flow rate, a shutoff valve 2 that is disposed in the gas flow path and shuts off the gas, a valve drive unit 3 that drives the shutoff valve 2 by a shutoff signal, and a flow rate A flow rate calculation unit 4 that calculates a flow rate based on a signal from the detection unit 1, a control unit 5 that controls the valve drive unit 3 and the flow rate calculation unit 4, and a current consumption of the control unit 5 are detected, and the current consumption is within a predetermined range. The current detection unit 6 outputs a current value when it is not, and the communication unit 7 transmits the current value from the current detection unit 6 to the centralized monitoring center via the communication line.

  As in the above configuration, the gas cutoff device of the present embodiment is provided with a current detection unit separately from the control unit, so that an accurate current value is measured even in an abnormal state of the control unit, and it is determined whether or not the gas cutoff is possible. be able to.

  In addition, by sending the current value from the current detection unit to the centralized monitoring center via the communication line, the current value of the control unit can be confirmed at the centralized monitoring center, so it is possible to take appropriate measures on site. it can.

(Embodiment 2)
FIG. 2 is a configuration diagram of a gas cutoff device according to Embodiment 2 of the present invention. As shown in FIG. 2, the difference from the first embodiment is that when the current value from the current detection unit 6 is equal to or greater than a predetermined value, the current value determination unit 8 that outputs a cutoff signal to the valve drive unit 3 and the current detection When the current value from the unit 6 is less than the predetermined value, the self-diagnosis unit 9 for self-diagnosis of the circuit abnormality of the control unit 5, the storage unit 10 for storing the current value from the current detection unit 6, and the storage unit 10 A comparison unit 11 that compares the measured current consumption value for a plurality of times in the past with the measured current consumption value and outputs a cut-off signal when the difference is within a predetermined range.

  When the current value from the current detection unit is greater than or equal to a predetermined value, a shutoff signal is output to the valve drive unit to immediately shut off the gas, thereby ensuring safety in using the gas before the battery is consumed.

  Furthermore, when the current value from the current detection unit is less than the predetermined value, the circuit abnormality of the control unit is self-diagnosed. Safety can be ensured.

In addition, the diagnosis result of the self-diagnosis unit is sent to the centralized monitoring center via the communication circuit, and continues if there is no problem in terms of gas use and safety during the period until the replacement of the control unit due to the detected abnormal state. By making the gas usable, convenience in using the gas can be achieved.

In addition, when the circuit is in a normal state, when a current consumption in a certain range is constantly consumed, by shutting off the gas, safety in using the gas can be ensured before the battery is consumed.

In addition, if the current value returns to normal after a certain period of time, the gas can be used normally, so that convenience in using the gas can be achieved.

  The gas cutoff device of the present invention can also be applied to applications such as technical fields where it is necessary for the control unit to accurately determine whether gas cutoff is possible even in an abnormal state.

The block diagram of the gas cutoff device in Embodiment 1 of this invention The block diagram of the gas cutoff device in Embodiment 2 of this invention Configuration diagram of conventional gas shut-off device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow rate detection part 2 Shut-off valve 3 Valve drive part 4 Flow rate calculation part 5 Control part 6 Current detection part 7 Communication part 8 Current determination part 9 Self-diagnosis function 10 Storage part 11 Comparison part

Claims (2)

A flow rate is detected by a flow rate detection unit that detects a gas flow rate, a shut-off valve that is disposed in the gas flow path to shut off the gas, a valve drive unit that drives the shut-off valve by a shut-off signal, and a signal from the flow rate detection unit. A flow rate calculation unit, a control unit that controls the valve drive unit and the flow rate calculation unit, a current detection unit that detects current consumption of the control unit and outputs a current value when the current consumption is not within a predetermined range ; A self-diagnosis unit for self-diagnosis of a circuit abnormality of the control unit when the current value from the current detection unit is less than a predetermined value; a storage unit for storing the current value from the current detection unit; and the storage unit A gas cutoff device comprising: a comparison unit that compares the measured current consumption value with a plurality of past consumption current values stored in the step and outputs a cutoff signal when the difference is within a predetermined range . Gas cutoff apparatus according to claim 1, further comprising a communication unit for transmitting through the communication circuit diagnostic results of the self-diagnosis unit.

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