JPH0617747B2 - Gas shutoff device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shutoff device that automatically shuts off a gas passage when an abnormality occurs to prevent an accident such as an explosion or poisoning caused by city gas or propane gas. Regarding

2. Description of the Related Art A conventional gas shutoff device of this type, as shown in FIG.
Gas meter 2 in the gas supply line 1 and flow rate measuring means 3 for issuing a signal according to the amount of gas passing through the gas meter 3.
And a cutoff means 4 for stopping the supply of gas is provided, and the cutoff means is judged to be abnormal if the usage condition is judged by the flow rate signal of the flow rate measurement means 3 and deviates from the preset and stored proper gas usage condition. 4 was provided with a control unit 5 for issuing a closing signal.

FIG. 4 shows an example of the configuration of this conventional control unit. Those having the same numbers as in FIG. 3 are components having the same function. The control unit 5 includes a use state detection unit 6 that receives the flow rate signal from the flow rate measuring unit 3 and detects the use state of gas, and an initial condition that sets appropriate use conditions in advance according to the number of the gas meter. A setting unit 7; a gas proper use condition setting unit 8 which stores the setting contents and sends a reference signal to the abnormality judging unit 9;
It comprises a closing signal output unit 10 which outputs a closing signal to the breaking means 4 in response to a signal from the abnormality judging unit 9.

Here, the proper use conditions indicate items such as total flow rate, individual maximum flow rate, and safety continuous use time set according to the capacity of each gas meter. The total flow rate is the total gas flow rate that passes through the gas meter within the specified measurement period.If the current total flow rate exceeds the specified value that was initially set when the gas hose was pulled out or when the gas appliances burned out, the shut-down means is activated. Let The individual maximum flow rate is the maximum gas consumption among the various gas appliances currently in use by detecting the change in the gas flow rate for each predetermined measurement period, and identifying how much gas consumption each has. When the amount exceeds the set value, a shut-off signal is output to the shut-off means to deal with gas leaks such as cracks in the gas hose and burning out when the gas plug is half-opened. In addition, the safe continuous use time is the continuous usable time set for each range from the statistical data of the time when the gas appliance in a certain combustion range is continuously used, and the data from the usage state detection unit is set as described above. When the time is exceeded, an operation signal is sent to the shutoff means to ensure safety even if the gas appliance is forgotten to be turned off.

Problems to be Solved by the Invention However, in the above-mentioned configuration, since the proper use condition is uniformly determined only by the initial value depending on the capacity of the gas meter installed in the gas pipe, it is special for households, etc. where the meter is installed. There was a problem that various conditions could not be incorporated.

The present invention solves such a conventional problem, and an object of the present invention is to provide a safer gas shutoff device by measuring the usage pattern of each home.

Means for Solving the Problems In order to solve the above problems, the gas shutoff device of the present invention is
Flow rate measuring means that emits a signal according to the amount of gas passing through the gas meter provided in the gas supply line, and shutoff means, and gas proper use conditions are stored in advance and the flow rate signal sent from the flow rate measuring means indicates the usage state. In a device provided with a control unit which judges that it is abnormal if it deviates from the proper use condition and issues a closing signal to the breaking means, a predetermined start signal applying means and a timer which counts a predetermined time by the start signal. A usage state storage means for storing a usage state within the predetermined time by a flow rate signal sent from the flow rate measuring means, and a gas proper use condition changing means for changing the gas proper use condition according to the contents of the storage means. It has a configuration.

Operation According to the present invention, when the start signal is applied to the timer, the present invention starts counting for a predetermined time, and at the same time, the gas usage pattern during the time is measured by the operation of the usage status storage means. That is, during this time, the measured values of the total flow rate, individual maximum flow rate, continuous use time, etc. described above are updated, and at the same time as the timer ends, the final data is sent from the gas proper use condition changing means to the setting section. . The gas proper use condition setting unit compares the initial condition with the final data to newly set a predetermined gas proper use condition. After that, the abnormality determination unit compares the new setting condition with the signal from the usage state detection unit, and if the condition is not satisfied, it is determined to be abnormal and the cutoff unit is activated.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, those having the same numbers as those in FIG. 4 are components having the same function. The control unit 11 inputs a flow rate signal from the flow rate measuring means 3 similar to the conventional one, and detects a use state of the gas and a use state detection unit 6, and an initial stage for setting appropriate use conditions in advance according to the number of the gas meter. A condition setting unit 7, a gas proper use condition setting unit 12 that stores the setting contents and sends a reference signal to the abnormality determination unit 9, and the abnormality determination unit 9
A closing signal output unit 10 for issuing a closing signal to the breaking means 4 in response to a signal from the timer, and a timer 1 for counting a predetermined time.
3, a start signal application means 14 for sending a start signal for starting counting to the timer, and a use state storage means 15 for storing a predetermined gas use pattern in response to a signal from a use state detection section when the timer starts operating. It comprises gas proper use condition changing means 16 which updates the actually measured value of the use pattern and sends final data to the gas proper use condition setting section when the timer expires.

In the above configuration, when the activation signal applying means (for example, the push button switch, the signal transmission means from the outside, etc.) is activated, the activation signal is sent to the timer, and the timer receives the signal and starts counting for a predetermined time. The predetermined time may be set in advance or may be set arbitrarily, for example, a span of one week or one month. Simultaneously with this timer operation, the usage state storage means 15 stores the gas usage pattern, that is, the total flow rate, the individual maximum flow rate, and the continuous use time. The gas proper use condition changing means stores the maximum value of the actually measured gas use pattern, and therefore updates the data. When the timer count ends, the final data is sent from the changing means to the gas proper use condition setting unit. In this setting section, the already set initial condition is compared with the maximum value sent from the changing means, and the one with the smaller value is selected and reset as a new proper use condition. In other words, until the above-mentioned timer count ends, the abnormality determination unit compares the current gas usage state with the preset initial value to determine the abnormal state, but the gas usage pattern measurement result during the timer operation. After the condition is newly reset from, the abnormal state is judged by comparing with the reset value. Here, when it is determined that there is an abnormality, the shutoff means is activated and the gas passage is closed.

The control unit described above can be easily realized by using a calculation or judgment function by a program operation of a microcomputer or the like. Hereinafter, FIG. 2 shows a schematic program flow.

When the program starts, the flow rate is measured at A, and then the usage state of gas is detected at B. Then, at C, it is determined whether or not the timer for a predetermined time is counting, and when counting, the usage state is stored at E and the maximum value is updated. If the timer is not working,
At D, the gas proper use condition and the use state detection value are compared. By the way, after exiting E, the comparison work is started at D. As a result of this comparison, if there is an abnormality, branch at F and G
Jump to the closing signal output part of. When it is not abnormal, it is checked whether or not the changing means is operated by H, and when it is operated, S,
That is, it returns to the flow rate measurement of A. When it has not been operated, I determines whether or not the timer count has ended,
At the end, J operates the gas proper use condition changing means. As described above, the maximum value of each stored pattern is compared with the initial value, and the one with the smaller value is selected and K is selected.
To reset. Thereafter, in D, the reset value is treated as a gas proper use condition, and is compared and compared with the detected value. When the timer count is not completed at I, the process branches to L to determine whether or not the timer is currently being counted. If it is counting, M continues counting as it is, and if it is not counting, N determines whether or not there is a start signal.
When the activation signal is input, the timer count is started with O. If there is no signal, it returns to A again. By executing this program flow, the function of the control unit of the gas shutoff device of the present invention can be realized.

Effects of the Invention As described above, the gas cutoff device of the present invention has the following effects.

(1) Gas leakage and combustion extinction can be detected by constantly monitoring the gas usage status and comparing it with the set appropriate usage conditions. In this case, the shutoff means is activated to stop the gas supply, so that it is possible to prevent a dangerous state such as gas explosion or gas poisoning.

(2) Observe the actual usage pattern of the gas supply system in which the gas meter is installed for a predetermined time by the start signal, compare the maximum value with the initial value, and make the specified value (for example, the smaller value) appropriate. Since it is set again as the usage condition, it is judged in consideration of individual special conditions compared with the condition that was uniformly determined by the capacity (number of gas meters) of the gas meter, which further increases the safety level against gas accidents. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas shutoff device in an embodiment of the present invention, FIG. 2 is a diagram showing a schematic program flow of a control unit of the device, FIG. 3 is a configuration diagram of a conventional gas shutoff device, and FIG. The figure is a block diagram of a conventional control unit. 2 ... Gas meter, 3 ... Flow rate measuring means, 4 ... Shutoff means, 11 ... Control section, 13 ... Timer, 14 ... Start signal applying means, 15 ... Use state storing means, 16 ... Gas proper Means of changing usage conditions.

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Claims (1)

[Claims] 1. A flow rate measuring means for emitting a signal according to the amount of gas passing through a gas meter provided in a gas supply line, a shutoff means, and a flow rate sent from the flow rate measuring means for storing gas proper use conditions in advance. A signal is used to judge the state of use, and when it deviates from the proper use condition, it is judged to be abnormal, and a control unit for issuing a closing signal to the shutoff means is provided. A timer and a gas proper use condition changing means for changing the gas proper use condition according to the contents of the use state storage means for storing the use state within the predetermined time by the flow rate signal sent from the flow rate measuring means are provided. Gas shutoff device.