JPH0690651B2 - Gas shutoff device - Google Patents

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 and prevents an accident such as an explosion or poisoning accident due to city gas or propellant. .

2. Description of the Related Art A conventional gas shutoff device of this type, as shown in FIG.
A flow rate measuring means 1 which emits a signal according to the amount of gas passing through a gas meter provided in the gas supply line, a use state detecting section 2 which detects a use state of gas by a flow rate signal sent from the flow rate measuring means, and a gas. An initial condition storage unit 3 that stores proper use conditions as initial values in advance, and an appropriate use condition determination unit 4 that outputs an interruption signal by determining that the signal from the use state detection unit deviates from the gas proper use condition. A timer 5 for counting a predetermined period of time, a start signal applying means 6 for activating the timer, and a signal from the use state detector for storing the gas use state during the timer operation and for setting the stored use state. The use state storage operation unit 7 which calculates the use condition based on the output is compared with the output of the use state storage operation unit and the initial condition, and a predetermined value is set as a new proper use condition. Further to proper use condition setting change unit 8
And a shut-off means 9 for shutting off the gas passage in response to a shut-off signal from the appropriate use condition judging section.

Here, the proper use condition indicates 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 flow rate of the gas 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 disconnected or the gas appliances burned out, it was judged as abnormal. This is the operating condition for determining and operating the interruption device. 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 shutoff signal is output to the shutoff device to deal with gas leaks such as cracks in the gas hose and burning out when the gas plug is half open. In addition, the safe continuous use time is
When the data from the usage condition detection unit exceeds the set time at 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, It sends an operation signal to ensure safety even if you forget to turn off the gas appliance.

With the above-described configuration, when the start signal is applied to the timer, the cout for a predetermined time is started, and at the same time, the gas usage pattern during the time is measured by the operation of the usage state storage / calculation unit. That is, during this time, the measured values of the above-mentioned total flow rate, maximum individual flow rate, continuous use time, etc. are updated, and at the same time as the timer ends, the final data is multiplied by a predetermined value in the use state storage calculation unit and gas is used properly. It is sent to the condition setting change section. The gas proper use condition setting changing unit compares the initial condition with the data of the storage operation unit to newly set a predetermined gas proper use condition. Or later,
The appropriate use condition determination unit compares the new setting condition with the signal from the use state detection unit, and if the condition is not satisfied, determines that the condition is abnormal and activates the shutoff unit.
(For example, Japanese Unexamined Patent Publication No. 63-101617) Problem to be Solved by the Invention However, in the above-mentioned configuration, the gas consumption pattern of each gas meter installation user within the period when the timer is operating is grasped and individually Although appropriate usage conditions are set, the above-mentioned conditions are not always appropriate when the gas appliance is replaced or is no longer used after the timeout.

The present invention solves the above-mentioned conventional problems, and monitors the gas usage state regularly even after the timer has finished operating, catches the gas consumption change of the meter-installed household, and automatically optimizes the optimum usage conditions. It is an object of the present invention to provide a safer gas shutoff device by modifying the gas shutoff device.

Means for Solving the Problems In order to solve the above problems, the gas shutoff device of the present invention is a flow rate measuring unit that emits a signal according to the amount of passing gas of a gas meter provided in a gas supply line, and the flow rate measuring unit. From the flow rate signal sent from the use state detection unit, an initial condition storage unit that stores gas proper use conditions as initial values in advance, and a signal from the use state detection unit indicates the gas proper use conditions. When it deviates, it is determined to be abnormal and an appropriate use condition determination unit that outputs a cutoff signal, a first timer that counts a first predetermined period, a start signal application unit that starts the first timer, and the use state A usage state storage computing unit that stores a gas usage state during operation of the first timer based on a signal from a detection unit and calculates usage conditions based on the stored usage state; A proper use condition setting changing unit that compares the output of the use state storage calculating unit with the initial condition and changes the setting of a predetermined value as a new proper use condition, and a gas passage according to a cutoff signal from the proper use condition determining unit. It comprises a shutoff means for shutting off and a second timer for repeatedly counting the second predetermined period.

Effect The present invention has the above-described configuration, detects the actual gas consumption pattern during the period in which the first timer operates, and sets the proper use condition of the meter-installed household based on the data, and at the same time, the first When the second predetermined period elapses, the first timer starts counting again to monitor the data for a predetermined period, and the proper use condition is reset. Since the second timer is repeatedly counted, data monitoring and resetting of proper use conditions are carried out periodically.

Embodiment An embodiment 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. 6 are components having the same function. However, the first timer 10 and the activation signal applying means 11 have the same functions as the timer 5 and the same means 6, respectively. Further, the gas shutoff device is composed of a second timer 12 that counts for a second predetermined period. In the above configuration,
When the count end signal is output from the second timer 12, the first timer 10 is started and the start signal applying means 11 is operated to store and calculate the gas usage state again. At 8, the proper use conditions are reset.

This situation will be described with reference to FIG.

In FIG. 2, the horizontal axis represents the elapsed time, and the vertical axis represents the proper use condition, that is, the interruption level for each interruption condition. The x mark represents the observed data, that is, the gas usage state. The alternate long and short dash line indicates the initial condition M1 (for example, the maximum limit value). The time T1 from time t1 to t2 on the horizontal axis is the first
The time period of the timer is shown, and the optimum use condition M2 is obtained by multiplying the maximum data p1 of the gas use state observed within the period by the safety factor k (for example, k = 1,5).
That is, the proper usage conditions during the period T1 are the same as the initial conditions.
It is M1, and at time t2, M1 is compared with M2 of the calculation result, and the smaller M2 is newly set as an appropriate use condition. After that, until the time t3 when the count of the second timer is over, this proper use condition M2 is applied, and when the gas use state exceeds M2, the proper use condition measuring unit judges that it is abnormal and activates the shutoff means. Output a cutoff signal. Time t1
The period from to the time t3 is the second predetermined period T2.

At time t3, the first timer restarts counting,
As in the period from t1 to t2, the gas usage state is observed, and at time t3
Is calculated by multiplying the maximum value p2 within the period T1 at time t4 by the safety factor k. This time t3 to t4
Within the T1 period, the condition M3 is applied as it is as a proper use condition.

After the time t4, M4 is applied until the second timer finishes timing, as described above, and the first timer is activated again at the timing end.

The above contents can be easily realized by using the calculation and judgment functions by the program operation of the microcomputer or the like. The schematic program flow is shown below in FIGS.

In FIG. 3, when the program starts, the initial value is set as the gas proper use condition at 13 and the start of the second timer is started, then the flow rate is measured at 14, and the gas flow as described above at 15 is measured. Detect the usage status. Then, at 16 it is determined whether or not the first timer for measuring the first predetermined period is counting, and when counting, at 17 the gas usage state is stored. That is, the maximum value of the usage state of the gas corresponding to each usage condition is stored and updated. After exiting 17 and when counting is not underway at 16, the appropriate gas usage conditions are judged at 18. In the case of 19, when the result of the determination in 18 is abnormal, it branches to 20 and outputs a cutoff signal. If not abnormal, the second at 21
The timer continues counting, and then at 22 it is checked whether or not the proper use condition setting changing section has been activated by the output of the use state storing / calculating section.

The branch contents in FIG. 4 will be described. At 23, it is judged whether or not the first timer count is over, and when it is over, the timer count is stopped at 24, and at 25, the output of the use state memory operation unit is compared with the initial condition, and the smaller one is selected. To change the settings for proper use conditions and branch to. Also, 23
If the timer count is not finished, the process branches to 26 to determine whether or not the first timer is currently counting. If it is counting, it continues counting as it is at 27, and if it is not counting, it is judged at 28 whether there is a start signal. When the activation signal is input, the counting of the first timer is started at 29. When there is no start signal yet, and after passing through 27 and 29, return to and continue the program processing from the flow rate measurement of 14.

The branch contents of will be described with reference to FIG. At 30, it is determined whether or not the second timer has finished counting, and at the time of termination, at 31 the count of the second timer is reset, and at 32, the determination content of 22 changes the proper use condition setting by the output of the use state storage operation unit. The part is changed so that it does not operate, and a start signal is set to operate the first timer, and subsequently, at 33, the second timer is started to start timing. When the timer count is not finished at 30 and after exiting 33, return to and continue the program processing from the flow rate measurement at 14.

By executing this program flow, the function of the gas shutoff device of the present invention can be realized.

By the way, in the above description, after the second timer counts over, the previous proper use condition is slid as the proper use condition applied during the period in which the first timer operates. That is, the data may be observed by applying the initial value as the proper use condition.

Further, after the gas use state deviates from the proper use condition and the gas is shut down, the shutoff condition may be reset by reobserving the data from the initial stage by the shutting-off means returning operation. At this time,
By continuing without resetting the count of the second timer and resetting the interruption condition again when the regular time comes, the periodic interruption condition can be corrected at a predetermined time of the year.

Furthermore, the second predetermined period is made the same as the first predetermined period,
That is, by continuously observing the data, it is possible to constantly observe the actual gas usage and immediately respond even if the gas equipment is changed in a short period of time.

Further, if the calendar function is applied as the second timer so that the second predetermined period can be set according to the seasonal variation, more detailed support can be provided.

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

By constantly monitoring the gas usage status and comparing it with the set appropriate usage conditions, it is possible to detect gas leakage and combustion extinction.If the conditions are deviated, that is, if it is determined that there is an abnormality Since the shutoff means operates to stop the gas supply, there is an effect that a dangerous state such as gas explosion or gas poisoning can be prevented in advance. Also, the start signal is used to observe the actual use pattern of the gas supply system in which the gas meter is installed for the predetermined time of the first timer, and compares the maximum value and the initial value observed during that period with the predetermined value. Since it will be set again as an appropriate use condition, it will be judged in consideration of individual special conditions compared with the condition that was uniformly determined by the capacity (number of issues) of gas appliances and gas meters. The safety level can be further increased. Furthermore, when the count time of the second timer ends after the first timer times out, the actual usage pattern of the gas supply system is observed again,
It will be reset as appropriate usage conditions. In other words, even when gas consumption decreases, replacement of equipment with a smaller combustion amount, or increase in consumption, it is possible to automatically respond by periodic data observation, and in actual use. There is an effect that the gas cutoff level can be set on the safer side without any trouble.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a gas shutoff device according to an embodiment of the present invention, FIG. 2 is a diagram showing a change over time in the operation of the device, and FIG. 3 is a diagram showing a schematic program flow in the embodiment of the present invention. FIG. 4 is a diagram showing a continuation of the program flow of FIG. 3, FIG. 5 is a diagram showing a continuation of the program flow of FIG. 3, and FIG. 6 is a functional block diagram of a conventional gas shutoff device. 1 ... Flow rate measuring means, 2 ... Usage state detection section, 3 ... Initial condition storage section, 4 ... Proper use condition determination section, 7 ... Use state storage calculation section, 8 ... Proper use condition setting change section , 9 ...
... shut-off means, 10 ... first timer, 11 ... activation signal applying means, 12 ... second timer.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Horii 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shinzo Kato 2-16-4 Tadao Machida, Tokyo High-pressure gas Liquefied petroleum gas research institute of the Japan Security Association (72) Inventor Mitsuo Namba 2-16-4 Tadao Tokyo Machida No. 16-4 High Pressure Gas Safety Association Liquefied Petroleum Gas Laboratory (56) Reference JP-A-2-144608 (JP, A) JP-A-1-308575 (JP, A) JP-A-63-127018 (JP, A) JP-A-63-101619 (JP, A)

Claims (1)

[Claims] 1. A flow rate measuring means for emitting a signal in accordance with an amount of passing gas of a gas meter provided in a gas supply line, and a usage state detecting section for detecting a gas usage state by a flow rate signal sent from the flow rate measuring means. And an initial condition storage unit that stores gas proper use conditions as initial values in advance, and a proper use condition determination unit that outputs a cutoff signal by determining that the signal from the use state detection unit is abnormal when the signal deviates from the gas proper use conditions. When,
A first timer that counts a first initial period, a start signal applying unit that starts the first timer, and a signal from the use state detection unit indicate a gas use state during operation of the first timer. A usage state storage computing unit that stores the usage conditions and computes usage conditions based on the stored usage states;
A proper use condition setting changing unit that compares the output of the use state storage operation unit and the initial condition and changes a predetermined value as a new proper use condition, and a gas passage according to a cutoff signal from the proper use condition determining unit. A shutoff means for shutting off and a second timer for repeatedly counting a second predetermined period are provided, and when the second timer counts over, a signal is transmitted to the activation signal applying means and the first timer restarts counting. Gas shutoff device.