JPS59122819A - Fuel shut-off control device - Google Patents

Abstract

PURPOSE:To enable a completion of returning-back operation to be informed without providing additional display units by a method wherein a content of display at the display unit is reset to eliminate the displayed content after a flow rate is measured for a specified period of time with signals from a returning-back signal input part. CONSTITUTION:A main control part 6 has various flow rate data which may be applied as a reference for a shut-off operation etc., and detects a released gas cock and a non-diminished condition of the combustion unit and at the same time outputs display data in response to the kind of flow rate data so as to inform the condition. Further, when a return signal is input to a return signal input circuit 5 during a manual returning operation of the shut-off part 8, a flow rate is measured again and a fact that no flow rate pulse is present for a specified period of time is acknowledged, the cause of shut-off operation is eliminated and the fact that a returning operation has been positively performed can be informed to the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a fuel cutoff control device that detects an abnormality in gas flow rate and cuts off gas supply.

Conventional configuration and its problems There is a fuel cutoff control device that detects the gas flow rate, determines abnormalities such as a large amount of gas continuing to flow for a long time, and prevents gas explosions and gas suicides. do.

As this type of gas cutoff device, there is one having a configuration shown in FIG. In FIG. 3, 26 is a flow rate sensor attached to the gas meter 32 to detect the flow rate of gas. The flow rate sensor 26 is, for example, a combination of a magnet provided in a diaphragm constituting the gas meter 32 or a part of a link mechanism that transmits the reciprocating motion of the diaphragm to an indicator, and a reed switch that detects the position of this magnet. There is. The gas flow rate can be determined by measuring the time from when the reed switch is turned on to when it is turned on again.

Reference numeral 28 denotes a self-holding manual return type solenoid valve which is a combination of a magnet and an electromagnetic coil provided in the gas flow path, and shuts off the gas flow path in response to a cutoff signal from the control section 31.

This solenoid valve 28 is configured to self-maintain in an open state by the force of a magnet, thereby reducing battery consumption as a power source for the device. Further, the shutoff operation is performed when the self-holding state is released as the electromagnetic force generated by passing a current through the electromagnetic coil overcomes the force of the magnet holding the valve in the open state. In this way, when the transmission is in the off-speed state, the magnetic force alone will not bring it into the open state, and there is no longer a need for current to flow.

To open the valve, open it manually and use the magnet to hold it in place. The control unit 31 receives a signal from the flow rate sensor 26, processes this signal according to a predetermined processing procedure, determines whether or not to shut off, and if the shut-off conditions are satisfied, sends a shut-off signal to the solenoid valve 28. Output against. As a processing procedure, for example, it is determined whether the flow rate detected by the flow rate sensor 26 continues to flow at a constant value for a predetermined time period. If the flow rate is exceeded, this condition indicates some kind of abnormality due to the equipment being used for a longer period of time than the normal usage time of the equipment corresponding to the flow rate.
Outputs a cutoff signal.

Since this type of device uses a self-holding manual return type solenoid valve, it is necessary for the control section to recognize whether the valve is in the cutoff state or not after the control section outputs the cutoff signal.

For this reason, for example, a magnet can be installed in the movable part of a solenoid valve, and a reed switch can be installed at a position where the solenoid valve is turned on when it is open and turned off when it is closed. Conventionally, it has been necessary for the control unit to recognize the This will now be explained in more detail using FIG. 4.

27 is a control circuit that converts the on/off state of the reed switch of the flow rate sensor 26 into voltage "Hi" and "LO" signals using a resistor 27A.This signal is received by the microcomputer 27B, and is converted into a predetermined signal stored as a program. Process according to the processing procedure. If the cutoff conditions are satisfied, the microcomputer 27B outputs a cutoff signal, which turns on the transistor 27C, causing current to flow through the electromagnetic coil of the solenoid valve 28C, and cutting off the gas flow path. Reference numeral 29 denotes a return detection circuit, which converts the ON/OFF state of the reed switch 2CIG into a voltage 'Hi' or *L ON signal using a resistor 29B, and inputs the signal to the microcomputer 27B. In the cutoff state, the reed switch 29C is off and the output of the recovery detection circuit 29 is "Hi". If the manual return operation is performed, valve 2
When valve 8C becomes open again, reed switch 29C is turned on and the output of return detection circuit 29 becomes "LO", thereby allowing microcomputer 27B to recognize that valve 28C is open. 3° is a battery as a power source for the device.

A drawback of such a conventional device is that when the solenoid valve 28C is manually reset, the solenoid valve 28C becomes truly open, and it is not possible to know whether or not the control circuit 27 recognizes this.

Purpose of the Invention The present invention solves these conventional problems.
In a combustion cutoff control device that has a function of displaying the reason for the cutoff, the present invention is intended to notify the operator that the return operation has been reliably performed without providing a new indicator.

Structure of the Invention In order to achieve this object, a display unit that displays a plurality of conditions, a sensor human input unit that inputs a fuel flow rate signal, a return signal input unit that inputs a return signal, and a return signal input unit for determining a shutoff. The basic configuration is a main control unit that has a storage unit that stores flow rate data. With this configuration, the content displayed on the display unit can be reset after measuring the flow rate for a predetermined period of time using a signal from the return signal input unit. It is easy to see that there is no longer any gas leakage and that the device has completely returned to its open state.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 1 is a power supply section consisting of a battery, 2
3 is a sensor input unit that inputs a fuel flow rate signal; 4 is an external sensor input unit that inputs an external sensor such as an earthquake sensor; and 6 is a shutoff unit. 6 is a main control unit consisting of a microcomputer; 7 is a display consisting of a light emitting diode for displaying a plurality of different states to indicate the reason for the interruption; Section 8 is a shutoff section consisting of a self-holding electromagnetic valve that shuts off the fuel supply path.

Next, the operation of the above configuration will be explained.

First, when the power supply unit 1 is turned on, the entire control device becomes operational. The main control unit 6 consists of a microcomputer,
The flow rate signal from the sensor human power section 3 and the clock signal from the clock generation section 2 are input, and the fuel flow rate per unit time is measured from the number of flow rate signals at arbitrary time intervals. Flow rate data that serves as a reference for shutting off is registered in advance in the microcomputer, and the measurement results and the flow rate data are compared. The registered flow rate is, for example, data on the maximum passing amount that must not be exceeded under normal usage conditions as specified by the gas meter in each home in the gas supply route, or the elapsed time at the same flow rate. If the time stipulated in the above is exceeded, it is determined that the appliance was forgotten to be turned off, and the flow rate data is used to shut it off.

As a result of the comparison, for example, if the maximum flow rate data is exceeded, the data will be displayed as shown in (a) of the table, and if the time exceeds the same flow rate, the data will be outputted to the display unit 7 as much as possible as shown in the table (b). A cutoff output is also provided to the cutoff section 8.

Table *However, ○ is on and × is off. In this way, various flow rate data are registered in the main control unit 6 to serve as criteria for shutting off, etc., and the gas valve is opened.

In addition to detecting forgetting to turn off an appliance, display data is output depending on the type of flow rate data to notify the cause. Further, when a return signal is input to the return signal input circuit 5 during manual return operation of the cut-off section 8,
After measuring the flow rate again and confirming that there is no flow pulse for a predetermined period of time, the reason for the interruption can be erased to notify the operator that the return operation has been reliably performed.

Further, by measuring the flow rate from when the return signal is input until the reason for the cutoff is removed, it is possible to prevent the terminal equipment from being returned with the cock open, for example, during a return operation.

FIG. 2 shows a specific embodiment based on the block diagram of FIG. The same numbers as in FIG. 1 indicate the same contents. Reference numeral 10 denotes a crystal oscillator whose frequency is divided by a counter 21, and is used to generate, for example, a clock pulse with a cycle of 01 seconds at the input terminal 11 of the main controller 6. Reference numeral 11 denotes a reed switch for measuring the flow rate of fuel, which is installed close to the meter so that a magnet responds to the gas flow rate, for example, and a transistor 12 responds to the operation of the reed switch 11 via a resistor 9 and the like. Therefore, the main control unit 6 can measure the fuel flow rate per unit time at any given time based on the number of pulses entering the input terminal I3 and the time at which the clock pulses entering the input terminal are counted. can. 13, 14゜16 are transistors and light emitting diodes (LED) 16, 17, 18 are connected to each other.
These currents are controlled by the output terminals o1, 02, and 03 of the main control section 6. Reference numeral 19 denotes a transistor for driving the self-holding shutoff valve 20. 22 is a transistor that turns on and off in response to a signal input to an external sensor terminal 26. Reference numeral 23 is a switch for generating a return signal, which may be configured to be turned on when the cutoff valve 2o is reset, and is inputted to the input terminal 14 of the main control unit 6 via the transistor 24.

Effects of the Invention As described above, the fuel cutoff control device of the present invention provides the following effects.

■ It is possible to notify the operator that the return operation has been reliably performed without providing a new indicator.

■ It is also possible to prevent accidents such as gas leakage that would occur if the device is returned with the cock of the terminal device open.

[Brief explanation of drawings]

The third paddle diagram is a schematic configuration diagram of a fuel cutoff control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the same device, FIG. 3 is a block diagram of a conventional fuel cutoff control device, and FIG. FIG. 3... Sensor human power section, 6... Return signal input section, 6... Main control section, 7... Display section, 8...・Shutoff part. Name of agent: Patent attorney Toshio Nakao and 1 other person Kasumi 1
Figure 3 Figure 4 Inside Tokyo Gas Co., Ltd., 1-2-16 Yaesu, Chuo-ku, Tokyo Applicant: Tokyo Gas Co., Ltd. 97, 1-2-16 Yaesu, Chuo-ku, Tokyo

Claims (1)

[Claims] A sensor input section into which a fuel flow rate signal is input, a cutoff section that cuts off the fuel supply path, a display section that displays a plurality of different states, and a return signal input section that detects when the cutoff section is reset. and signals from the output terminals that drive each of the display section and the cutoff section, the sensor human power section, and the return signal input section, and at least a plurality of flow rate data and the flow rate data that serve as a reference for driving the cutoff section. a main control unit that has a program ROM in which cut-off cause data related to the reset signal is registered in advance, and that resets the display data of the display unit after comparing the flow rate sensor signal with a predetermined flow rate for a predetermined time when the return signal is input; A fuel cutoff control device consisting of: