JPH0644938B2 - 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.
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 time, a start signal applying means 6 for activating the timer, and a signal from the usage state detector for storing the gas usage state during the timer operation and for setting the stored usage 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 to set a predetermined value 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. Judgment is a use condition for 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 activation signal is applied to the timer, counting of 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 status 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. Thereafter, the proper 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 means.
(For example, Japanese Patent Laid-Open 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 in which 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 such a conventional problem, and always monitors the gas usage state even after the timer has finished operating, catches the gas consumption change in the meter-installed household, and automatically corrects it to the optimum optimum usage condition. This aims to provide a safer 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. A shutoff means for shutting off, and a monitoring area calculation storage section which, after the appropriate usage condition is changed by the appropriate usage condition setting changing section, multiplies the changed appropriate usage condition by a predetermined value to obtain a usage state monitoring area, A second timer that starts counting for a second predetermined period, and it is determined whether or not a signal from the usage state detection unit has entered the monitoring area, and each time a signal is input, the second timer is reset and counted. And a monitoring area data appearance observing section for restarting the first timer, and when the count end signal is output from the second timer, the first timer
The activation signal applying means is actuated in order to activate the timer and re-store and calculate the gas use state, and the proper use condition setting change section resets the proper use condition.

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 after the timeout. The state of use of the gas entering the monitoring area is constantly monitored, and the count of the second timer is reset and restarted each time the gas flow rate data in the monitoring area is generated. Then, when the data in the monitoring area is not observed for the second predetermined period, the first timer is activated to observe the gas usage state again, and the proper usage condition setting changing unit resets the proper usage condition. Of.

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 of 10 is 5
It has the same function as the timer. Further, the present gas shutoff device includes an appropriate use condition setting changing unit 12 that compares the output of the use state storing / calculating unit 7 with an initial condition and changes a predetermined value as a new appropriate use condition, and the appropriate use condition setting changing unit.
After the proper use condition is changed in 12, the changed use condition is multiplied by a predetermined value to set a monitoring region calculation storage unit 13 as a monitoring region of a use state, and a count for a second predetermined period is started. 2 timer 14 and a monitoring area data appearance observing section that determines whether or not the signal of the use state detecting section has entered the monitoring area, and resets the second timer and restarts counting each time a signal is input. 15 and the starting signal applying means 11 of the first timer. In the above structure, when the second timer 14 outputs a signal indicating the end of counting, the first timer is started and the start signal applying means 11 is operated to store and calculate the gas usage state again, and the proper use condition setting is performed. The changing unit 12 resets the proper use condition.

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 level for each breaking condition. The x mark represents the observed data, that is, the usage state. Also,
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 indicates the time period of the first timer, and the safety factor k (for example, k = 1, k = 1, 1) is included in the maximum data p1 of the gas use state observed within the period. 5) is multiplied to obtain the proper use condition M2. That is, the proper use condition in the period of T1 is M1, which is the same as the initial condition, and at time t2, M1 is compared with M2 of the calculation result, and the smaller M2 is newly set as the proper use condition. At the same time, the lower limit level L2 is calculated in order to obtain the data monitoring area. That is,
The area from L2 to M2 is the monitoring area. After that, when the gas use state exceeds M2, the proper use condition determination unit determines that it is abnormal and outputs a cutoff signal to operate the proper means.

The timer 2 starts counting from the time t2, but since the data p2 in the monitoring area is generated at the time t3,
The count is reset. T2A is a time period until the reset. Subsequently, the timer 2 restarts counting from time t3. However, similarly to the above, since the data p3 exceeding the level L2 is generated at the time t4, the count is reset. T2B is t
It is a timing period from 3 to t4.

However, from time t4 to time t5, no data is generated in the monitoring area, and the second timer finishes counting for the second predetermined period T2. Therefore, time t
The first timer starts from 5 and the gas usage state is observed in the same manner as the period from t1 to t2 described above, and the maximum value p4 in the T1 period from time t5 to time t6 is multiplied by the safety factor k to obtain a new appropriate value. The usage state M3 is required. L3 is the lower limit level of the new monitoring area.

After the time t6, the second timer is activated and restarts counting, but since the data p5, p6, p7 in the monitoring area are generated at the respective times t7, t8, t9, the count is reset at each time. Has been done. The count period until the reset is T2C, T2D, T2E, respectively.
Is.

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

In FIG. 3, when the program starts, an initial value is set as a gas proper use condition at 16, then a flow rate is measured at 17, and a use condition of the gas as described above is detected at 18. Then, at 19, it is determined whether or not the first timer for measuring the first predetermined period is counting, and when it is counting,
Use 20 to memorize the usage status of gas. That is, the maximum value of the usage state of the gas corresponding to each usage condition is stored and updated. After exiting 20 and when counting is not in progress in 19, the determination of appropriate gas usage conditions is performed in 21. At 22, when the result of the determination at 21 is abnormal, it branches to 23 and outputs a cutoff signal. When it is not abnormal, it is checked at 24 whether or not the proper use condition setting changing section has been operated by the output of the use state storing / calculating section, and the process branches to when it has been operated and to when it has not been operated.

The branch contents in FIG. 4 will be described. At 25, it is determined whether or not the first timer count has ended, and when it has ended, at 26, the timer count is stopped, and at 27, the output of the use state storage operation unit is compared with the initial condition, and the smaller one is selected. Then 28
Change the setting of proper use conditions with. At 29, the data monitoring area is calculated and stored from the changed appropriate use conditions. Then, at 30, the second timer starts counting and the process branches to. When the timer count is not completed at 25, the process branches to 31, and it is determined whether the first timer is currently counting. If it is counting, it continues to count at 32, and if it is not counting, it counts to 33.
The presence or absence of a start signal is determined by. When the activation signal is input, the counting of the first timer is started at 34. If there is no start signal yet, and after passing through 30, 32, 34, return to and continue the program processing from the flow rate measurement of 17.

The branch contents of will be described with reference to FIG. At 35, it is determined whether or not the second timer has finished counting. At the time of termination, at 36, the counting of the second timer is stopped, and at 37, the determination contents of 24 change the proper use condition setting by the output of the use state storage calculation unit. The part is changed so that it does not operate, and the initial condition is set as a proper use condition, and subsequently, at 38, the first timer is started to start timing. If the timer count is not completed at 35, the process branches to 39 to determine whether or not data has occurred in the data monitoring area. If so, the process branches to 40 to reset and start the second timer count. . If the data is not generated at 39, the second timer continues counting at 41.
After passing through 38, 40, 41, return to and continue the program processing from the flow rate measurement of 17.

By executing this program flow, the function 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.

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. In addition, the start signal is used to observe the actual usage pattern of the gas supply system in which the gas meter is installed for the specified time of the first timer, and the maximum value is compared with the initial value to re-establish the specified value as an appropriate usage condition. Since the setting is made, it is possible to further increase the safety level against a gas accident, because the determination is made taking into account individual special conditions, as compared with the conditions that are uniformly determined by the capacity (number) of the gas meter. Further, after the first timer has timed out, the data monitoring area is set to constantly monitor the data, the second timer starts counting, and a period during which no data enters the monitoring area is the second timer. If the count time of is exceeded, the actual usage pattern of the gas supply system is observed from the initial state,
It will be reset as appropriate usage conditions. In other words, even if the gas consumption decreases, or if you replace the equipment with a smaller amount of combustion, you can automatically cope with it, and there is an effect that the gas cutoff level is set to a safer side. .

[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 changes over time in proper use conditions of the device, and FIG. 3 is a schematic program flow in an embodiment of the present invention. FIG. 4, 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 usage condition determination section, 7 ... Usage state storage / calculation section, 9 ... Shut-off means, 10 ... 1st timer, 11 ... Activation signal applying means, 12 ... Appropriate use condition setting changing section, 13 ... Monitoring area calculation storage section, 14 ... Second timer, 15 ... Monitoring area data appearance observing section.

 ─────────────────────────────────────────────────── ─── 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 Research Center

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 for counting a first predetermined period, a start signal applying means for starting the first timer, and a gas use state during operation of the first timer based on a signal from the use state detection unit. And a use state storage operation unit that calculates use conditions based on the stored use state,
A proper use condition setting changing unit that compares the output of the use state storage calculation unit with 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 shut-off means for shutting off, and a monitoring area calculation storage section which, after the appropriate usage conditions are changed by the appropriate usage condition setting changing section, multiplies the changed appropriate usage conditions by a predetermined value to obtain a usage state monitoring area. , A second timer that starts counting a second predetermined period, and whether or not a signal from the usage state detection unit has entered the monitoring area, and resets the second timer each time a signal is input. And a monitoring area data appearance observing section for restarting counting, and when the counting completion signal is output from the second timer, the first timer should be started to store and calculate the gas usage state again. Activation signal applying means is operated, said proper use condition setting gas shutoff device for resetting the proper use condition at changing unit.