JPH0613926B2 - Gas accident prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention monitors the usage state of a gas appliance from the amount of gas flowing and the duration of the gas flowing, and stops gas when it is judged to be dangerous. Related to accident prevention device.

[Prior Art] As a gas accident prevention device that stops the gas when it is judged to be dangerous by monitoring the usage state of a gas appliance from the flow amount of the gas and the duration of the gas flow, the present applicant has applied for a patent in the past. The one disclosed in JP-A-57-195978 is known.

The feature of this known invention is that, depending on the gas consumption,
The continuous use safety time of a single gas appliance can be stored in advance, the overall gas flow rate value is measured at regular intervals by the flow rate measuring device, and if an increase in the previous value and the current value is recognized, The increase is taken as the consumption of one gas appliance, and the gas consumption of each appliance can be obtained by this method, and when the total flow rate of the supplied gas changes, starting continuous use time measurement, The same flow rate continues to be used until the next change occurs. Maximum gas consumption during use When the gas consumption of the equipment exceeds the memorized continuous use safety time, an emergency shutoff installed in the gas supply furnace It is configured to issue a closing signal to the valve.

If the gas is stopped under such conditions, the danger is constantly monitored by the usage time of the appliance with the maximum gas consumption of the gas appliances used, which is extremely effective from a safety point of view. There is no worry of running out.

[Problems to be Solved by the Invention] However, in some gas appliances, for example, as in a hot-water storage hot water boiler, in order to keep the hot water temperature constant, O gas is automatically supplied.
Some of them continue N / OFF operation. Considering the case of such a gas appliance, it means that the measurement is cleared every time this is turned on / off. As a result, even if there is a gas leak or forgetting to turn off the gas appliance, it is predicted that the situation cannot be detected.
FIG. 3 shows an example of the above-mentioned conventional example, but it is assumed that the gas flow rate of Q ₁ is measured, the timer is started, and the flow rate of Q ₂ is measured after a lapse of a certain time. In this case, Q ₂ <
Even if Q ₁ or Q ₁ <Q ₂ , there is a change in the flow rate, the timer is cleared, and the time measurement starts again from 0. As a result, even if the gas appliance corresponding to Q ₁ has been in the ON state for a long time beyond the continuous use safety time, the state of ON for a long time can be seen by clearing the measurement, and the emergency shutoff valve can be turned on regardless of the time. A situation occurs in which it does not close.

The present invention is proposed in view of such a point, and an object thereof is to propose a gas accident prevention device that is particularly effective when a gas appliance used by a customer includes an appliance that automatically repeats ON and OFF. Is.

[Structure of the Invention] The structure of the present invention is as follows.

a. A supply gas flow measuring device installed in the gas supply line; b. A supply gas emergency shutoff valve mounted in the gas supply line; c. Gas appliance storage means capable of storing the gas consumption of each gas appliance and the corresponding continuous use safe time, and d. The flow rate measuring device measures the total flow rate of the supply gas at regular time intervals, and when an increase in the total flow rate is recognized, it is determined that one gas appliance corresponding to this increase has started to use the gas appliance. Then, the consumption of this gas appliance is sequentially registered, and if a decrease in the overall flow rate is recognized, the usage status of the gas appliance is registered as if the usage of the gas appliance of the gas consumption corresponding to this decrease was stopped. Gas flow rate storage means for each appliance to be operated, e. An increase in the total flow rate of the supply gas being measured by the flow rate measuring device was recognized, and since one gas appliance corresponding to this increase registered the gas consumption of the gas appliance as having started using it, The measurement of the continuous use time of the gas appliance is started, the time measurement is continued as long as the continued use of the gas appliance is recognized, and the continuous usage time of each gas appliance is continuously measured, and this is continued. Determining means for sending a signal to the emergency shutoff valve to close when the time first exceeds the continuous use safe time corresponding to the individual gas appliance; f. Gas accident prevention device consisting of.

In the present invention, the start and stop of use of the gas appliance can be easily determined by the amount of change if the gas flow rate is measured. Therefore, if you continuously measure the continuous use time of all the gas appliances currently in use and stop the gas when there is something that exceeds this continuous use safe time, other automatic Even if a gas appliance that repeatedly turns on and off is in operation, it is completely unaffected by this.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which 1 is a gas meter, 2 is a metering unit, and 3 is a flow rate measuring device for measuring the flow rate of gas flowing to the consumer side. The measuring device 3 is provided with a permanent magnet in a part of the crank mechanism in the gas meter 1, and a magnetically responsive element for generating a pulse due to its magnetic force is provided within the magnetic sensitive range of the permanent magnet. This is a configuration for emitting the digital signal of.
Reference numeral 4 is an emergency shutoff valve mounted in the gas meter on the gas supply line. Reference numeral 5 is a control circuit (safety monitoring circuit), and the control circuit 5 is a gas appliance storage means capable of storing the gas consumption of each gas appliance and the continuous use safe time corresponding thereto, When the total flow rate of the supplied gas is measured at regular time intervals with a flow rate measuring device and an increase is found in this total flow rate, it is determined that one gas appliance corresponding to this increase has started its use. Then, the consumption of this gas appliance is sequentially registered, and if a decrease in the overall flow rate is recognized, the usage status of the gas appliance is registered as if the usage of the gas appliance of the gas consumption corresponding to this decrease was stopped. An increase in the total flow rate of the supply gas being measured by the instrument-specific gas flow rate storage device and the flow rate measuring device is recognized, and one gas instrument corresponding to this increase is considered to have started to use the gas instrument. From the time the cost is registered, start measuring the duration of use of the gas appliance and continue measuring the time as long as the usage of the gas appliance is permitted to continue. Determining means for transmitting a closing signal to the emergency shutoff valve when the continuous operation time first exceeds the continuous use time corresponding to each gas appliance.

FIG. 2 shows the closing condition of the emergency shutoff valve 4 in the present invention. When the flow rate Q ₁ is sensed now, the timer for measuring the continuous use time of this flow rate is started and the measurement is started. Then, when the flow rate increases by Q ₂ after the lapse of T ₁ , another timer for measuring the continuous use time of Q ₂ is newly started, and the timer for measuring the continuous use time of Q ₁ is cleared. Instead, continue measurement. Furthermore, when the flow rate decreases by Q ₂ after the lapse of time T _2, the gas appliance with the flow rate Q ₂ is stopped,
_The timer for measuring the continuous use time of Q ₂ clears that the flow rate of ₁ is continuing, and the timer for measuring the continuous use time of Q ₁ does not clear and continues time measurement.

Then, when the continuous use safety time T _n of Q ₁ is exceeded, a signal for closing is sent to the emergency shutoff valve 4. Incidentally, when the Q ₁ is deactivated successfully, if there is a flow rate of Q _2, the time measurement for this Q ₂ is continued.

The above shows the simplest example, and for gas appliances that are measuring at the same time, stop the gas when the first one of them exceeds the continuous use safe time.

[Effects of the Invention] As described above, according to the present invention, the continuous use safety time of a single gas appliance is stored in advance according to the gas consumption amount, and the continuous usage time of each gas appliance currently in use is stored. Is simultaneously monitored by the control circuit, and the emergency shutoff valve is closed when there is a gas appliance that exceeds the continuous use safety time for the first time, so the safety is extremely high. or,
Even if there is another change in the flow rate, this is ignored, so there is no worry of overlooking the abnormality in the case of a customer using a gas appliance that automatically repeats ON and OFF.

[Brief description of drawings]

FIG. 1 is an explanatory view of an apparatus embodying the present invention, FIG. 2 is an explanatory drawing of the operating principle of the present invention, and FIG. 3 is an explanatory drawing of the operating principle of a known gas accident prevention apparatus. 1 ... Gas meter, 2 ... Metering unit, 3 ... Flow rate measuring device, 4 ... Emergency shutoff valve, 5 ... Control circuit,

Claims (1)

[Claims] 1. A. A supply gas flow measuring device installed in the gas supply line; b. A supply gas emergency shutoff valve mounted in the gas supply line; c. Gas appliance storage means capable of storing the gas consumption of each gas appliance and the corresponding continuous use safe time, and d. When the total flow rate of the supply gas is measured at regular time intervals by the flow rate measuring device and an increase is recognized in this total flow rate, it is assumed that one gas appliance corresponding to this increase has started its use. Judgment is made and the consumption of this gas appliance is registered in sequence, and if a decrease in the overall flow rate is observed, it is assumed that the usage of the gas appliance with the gas consumption corresponding to this decrease has been stopped Gas flow rate storage means for each device to be registered, e. An increase in the total flow rate of the supply gas measured by the flow rate measuring device was recognized, and one gas appliance corresponding to this increase was registered as the consumption amount of the gas appliance as the start of its use. Continue to use the gas appliance, start measuring the time, continue to measure the time as long as the continued use of the gas appliance is recognized, continuously measure the continuous usage time of each gas appliance, and continue. Determining means for sending a signal to the emergency shutoff valve to close when the open time first exceeds the continuous use time corresponding to the individual gas appliance; f. Gas accident prevention device consisting of.