JPS60231294A - Gas alarm breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention starts integrating the gas flow rate when the commercial power is cut off, that is, when the power outage time has elapsed, and the integrated value is determined in advance. When the gas volume matches the safety limit gas volume calculated according to the configuration of the gas usage area, the gas shutoff valve is closed to cut off the inflow of gas, and an abnormality alarm is displayed to prevent a gas disaster. This invention relates to a gas alarm shutoff device that can prevent accidents.

(Prior art) In recent years, houses, especially apartment complexes, have become taller and taller.
Due to airtightness, many gas disasters occur due to age-related deterioration of gas appliances, gas piping, gas hoses, etc., or due to deliberate gas ejections, such as when a person attempts to commit suicide by gas. In some cases, neighboring houses were also damaged by explosions.

For this reason, gas safety devices are needed to prevent gas accidents, etc. For example, gas alarms are installed at gas usage locations to issue an alarm when the gas concentration at the gas usage location reaches a dangerous concentration. There is a method to stop the inflow of gas by outputting a gas cutoff signal to the gas cutoff valve, but since gas safety devices generally function by receiving power from a commercial power source, it is possible to If a person intending to do so intentionally cuts off the supply of commercial power, the gas safety device becomes inoperable, making it impossible to prevent a gas disaster.

(Objective of the Invention) The object of the present invention is to prevent the gas alarm and cutoff device from operating when the commercial power supply supplied to the gas alarm cutoff device is cut off intentionally or due to a power outage.
When the integrated gas flow rate, which is measured after a certain period of time has passed since the commercial power was cut off, matches the safety limit gas volume value calculated and set in advance according to the configuration of the gas usage area, the gas It is an object of the present invention to prevent gas disasters by providing a gas alarm cutting device that outputs a cutoff IN signal to a gas cutoff valve to cut off the inflow of gas.

(Structure of the Invention) In order to achieve the object of the invention, the present invention includes a gas meter that outputs a flow rate signal corresponding to a gas flow rate, a gas cutoff valve disposed on the outlet side of the gas meter, and a commercial power source. a power supply device that includes a built-in battery that is charged by receiving the power supply, and outputs a predetermined voltage when the supply of commercial power is cut off; The integrated value of the gas flow rate is calculated by inputting the signal and a condition signal preset according to the configuration conditions of the gas usage location, and starting measurement at an arbitrary set time from the time when the commercial power supply is cut off. When it matches the safety @ outside gas volume value calculated and set in response to the condition signal, a gas a cutoff signal is output to the gas cutoff valve to cut off the inflow of gas to the gas usage area and display an abnormality alarm. This is a gas alarm shutoff device equipped with a sound control device.

(Embodiment of the Invention) The configuration of one embodiment of the present invention will be explained with reference to FIG. A gas cutoff valve 5 is provided on the outlet 2 side of the gas meter 1, which displays the integrated gas flow rate and outputs an electrical signal corresponding to the gas flow rate, and is operated by a gas cutoff signal output from a control panel OB, which will be described later. A gas stove 6 is provided at the gas use place 4 via a gas cock 5.

The control panel OB is made up of the following circuits and alarm indicators. That is, the power supply circuit includes a battery, for example, a nickel-cadmium battery, which is charged by receiving a commercial 100V power source, and outputs a predetermined voltage when the supply of the commercial 100V power source is cut off due to a power outage or intentionally. 7, when the supply of commercial 100V power is cut off, the gas meter 1 receives a predetermined DC voltage supply from the power supply circuit 7, and outputs the flow rate number, and the gas usage location 4.
By inputting the configuration conditions, for example, the product of the gas usage area and the setting output 1d from the potentiometer for converting the ventilation rate r into an electric signal, For example, start integrating the gas flow rate after one minute has passed, and the integrated value corresponds to the space volume and ventilation rate of the gas usage area 4, and the explosive limit gas concentration.
It is composed of a calculation circuit 8 in advance and an alarm display 9 that outputs a gas cutoff signal to the gaff and cutoff valve 3 to display an alarm that the gas has been cut off.

FIG. 2 shows the internal configuration of the control panel CB.
volts and a DC voltage of 24 volts is supplied to a control circuit 8 and a pulse output circuit 12 which outputs a gas interruption pulse signal to the gas cutoff valve 5.

The control circuit 8 is a microcomputer CPU.

Continuous writing memory RAM, read-only memory ROM,
It is composed of an input/output port 10, etc., and the gas meter 1 outputs an fc electric r= signal, for example, a pulse signal, corresponding to the gas flow rate, and the gas flow rate is integrated by inputting and counting this pulse signal.

It also includes a potentiometer 15 for setting the spatial volume of the gas usage location 4, and a potentiometer 14 for setting the ventilation rate determined by the structure of the gas usage location 4, etc. Based on the output voltage and the gas lower explosion limit a degrees set in advance by the program, the safety limit gas volume value indicating the safe maximum gas flow cumulative value at the gas usage location 4 is calculated and memo! Make memory settings in RAM.

(Operation of the embodiment) Next, the operation of the embodiment will be explained. Now the control panel O
For example, if the commercial power supply that was being supplied to B is
1. When the signal is turned on, a predetermined voltage is immediately supplied from the source circuit 7 to the control circuit 8 and the pulse output circuit 12.

For example, one minute after the control circuit 8 receives the voltage supply from the d source circuit 7, it starts counting the pulse signals output from the gas meter 1 and starts integrating the gas flow rate flowing through the gas meter 1. , a spatial volume signal of the gas usage location 4 set in advance by the potentiometer 16,
Based on the ventilation rate signal of the gas use location 4 set by the potentiometer 14 and the lower explosive limit concentration signal of the gas set by the program in the read-only memory ROM,
Calculate the safe limit gas volume value that determines the safe maximum gas flow integrated value at the gas usage location 4, and store it in the memory RAM.
Store in.

At the moment when the integrated value of the gas flow rate after the control circuit 8 starts integrating the gas flow rate flowing through the gas meter 1 matches the safe limit gas volume value, the circuit outputs a pulse abnormal signal via the input/output port 10. At the same time, a display signal is output to the alarm display 9 to cause it to light up, sound a buzzer, and display a pipe display.

The pulse output circuit 12 into which the abnormal signal outputted from the input/output port 10 of the control circuit 8 is inputted is connected to the gas disconnection valve 6.
In the DC analogy, by outputting a pulse voltage with a pulse width of 24 ports and 100 milliseconds to close the valve,
The gas flowing into the gas usage location 4 is cut off.

This effect can be expressed in concrete numbers as follows. That is, if the space volume R of the gas usage area is 55 (g), the ventilation rate of the gas usage area is 0 times/hour, that is, a completely sealed state, and the lower explosive limit concentration C of gas is 0.05, then
The safe limit gas volume value Mmax (F7/) is 1.75y/
Therefore, at the moment when the integrated value of the gas flow rate flowing into the gas use place 4 matches 1.75a, the pulse voltage is outputted from the control panel CB to the gas cutoff valve 2 to stop the gas inflow.

In this way, even if a person who intends to commit suicide intentionally cuts off the commercial power supply and then opens the gas cock 5 at the gas usage area 4 to blow out unburned gas, the integrated gas flow rate will be Since it cuts off the inflow of gas to rrlJ, which is in a dangerous state due to a gas explosion, it works to prevent a gas disaster caused by a gas explosion. This specific example is a fairly simple example, but ventilation is basically determined by the space volume of the gas usage area, the structure of the room (for example, whether it is made of concrete or wood), and the airtightness of the windows. If the potentiometer is set according to the rate, it will automatically work to prevent gas disasters.

(Effects of the Invention) The present invention provides a method for detecting gas that starts measuring a certain amount of time after a certain period of time has elapsed since the commercial power supply was cut off, either intentionally or due to a power outage. The flow rate integrated value will vary depending on the configuration of the gas usage location.
By outputting a gas cutoff signal to the gas cutoff valve to cut off the inflow of gas when the gas volume matches a preset safety limit gas volume value, gas disasters can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a gas alarm shutoff device according to an embodiment of the present invention, and FIG. 2 is a partial detailed diagram thereof. 1...Gas meter 5...Gas cutoff valve 4...Gas usage location 5...Gas cock 7...VT source circuit 8
...Control circuit 9...Alarm indicator 11...Battery CB...Control panel

Claims (1)

[Claims] A gas meter that outputs a flow rate signal corresponding to the gas flow rate;
a gas cutoff valve disposed on the outlet side of the gas meter; and a power supply device that includes a built-in battery that is charged by receiving the supply of commercial power and outputs a predetermined voltage when the supply of the commercial power is cut off. , receives voltage from the power supply, inputs a flow rate signal from the gas meter and a condition signal preset corresponding to the configuration conditions of the gas usage location, and calculates the flow rate from the point in time when the commercial disarmament is cut off. When the gas flow rate integrated value that started measurement after an arbitrary set time has passed matches the safety limit gas volume value calculated and set in response to the condition signal,
A gas alarm cutoff device comprising: a control device that outputs a gas cutoff signal to the gas cutoff valve to cut off gas inflow to a gas usage area and displays an abnormality alarm.