JPH0670488B2 - 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 is 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, 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, 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 a total flow rate set according to the capacity of each gas meter, an individual maximum flow rate, and a safe continuous use time. 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. What is the individual maximum flow rate?
By detecting the change in gas flow rate every predetermined measurement period, it is possible to identify how many kinds of gas appliances are currently used and how much gas consumption is used for each, and the maximum gas consumption among them exceeds the set value. In this case, a shutoff signal is output to the shut-off device 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 time that can be continuously used set for each range from the statistical data of the time that gas appliances in a certain combustion range are continuously used,
When the data from the usage state detection unit exceeds the set time, an operation signal is sent to the shutoff device to ensure safety even if the gas appliance is forgotten to be turned off.

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. Or later,
The proper use condition determining unit compares the new setting condition with the signal from the use state detecting unit, and if the condition is not satisfied, determines that the condition is abnormal and activates the breaking means. (For example, Japanese Patent Application No. 61-248688) Problem to be Solved by the Invention However, in the above configuration, the gas consumption pattern of each gas meter installation user within the period in which the timer is operating is grasped and individually. Appropriate usage conditions are set, but if the gas appliance is replaced or newly installed after the time-out, the above conditions are not always appropriate.

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 gas passing through a gas meter provided in the gas supply line, a usage state detection unit that detects a gas usage state from a flow rate signal sent from the flow rate measuring unit, and a proper gas usage An initial condition storage unit that stores conditions as initial values in advance; an appropriate use condition determination unit that outputs an interruption signal when the signal from the use state detection unit deviates from the gas proper use condition and outputs an interruption signal; A first timer that counts a predetermined period, a start signal applying means that starts the first timer, a signal from the usage state detection unit that stores the gas usage state during operation of the first timer, and A usage state storage computing unit that computes usage conditions based on the stored usage state, compares the output of the usage state storage computing unit and the initial condition, and sets a predetermined value to a new appropriate usage condition. And a proper use condition setting changing section for changing the setting, and when the proper use condition is changed by the proper use condition setting changing section, the changed proper use condition is multiplied by a predetermined value and an appearance rate observation area of a use state is provided. An appearance rate observation area calculation storage unit, a second timer that counts a second predetermined period, a provisional proper use condition calculation unit that calculates the signal of the use state detection unit to provisionally set the proper use condition, It is determined whether or not the signal of the usage state detection unit has entered the appearance rate observation area, and at the time of the first entry, an activation signal to the second timer is output, and the provisional appropriate usage condition calculation unit also outputs. On the other hand, a start signal is output to the appropriate use condition setting changing unit to output a temporary setting signal, and a gas use state that enters the appearance rate observation area during operation of the second timer is stored, and the stored use is further stored. Based on condition Operating condition storage calculation unit for calculating the usage conditions, the appropriate usage condition temporary storage unit that stores the current appropriate usage conditions, and the gas passage is shut off according to the shutoff signal from the appropriate usage condition determination unit. It is provided with a structure called a shut-off means.

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 usage status of the gas entering the appearance rate observation area is constantly monitored, and when a signal first enters the appearance rate observation area, the proper use condition is provisionally set from the signal and at the same time the second timer is activated and the timer is counting. The operating conditions are calculated on the basis of the gas usage state falling within the observation rate observation area, and the appropriate gas usage conditions are newly reset or returned to the previous appropriate usage conditions based on the result. Even after that, it is determined whether or not the gas should be shut off, and the monitoring of the gas usage state entering the appearance rate observation area is continued.

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. 7 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 a proper use condition setting changing unit 11 that compares the output of the use state storing / calculating unit 7 with an initial condition and changes a predetermined value as a new proper use condition, and the proper use condition setting changing unit.
When the proper use condition is changed in 11, the appearance ratio observation area calculation storage unit 12 that multiplies the changed proper use condition by a predetermined value as the appearance ratio observation area in the use state, and counts the second predetermined period The second timer 13, the provisional proper use condition calculation unit 14 for calculating the signal of the use state detection unit to temporarily set the proper use condition, and whether the signal of the use state detection unit enters the appearance rate observation area. To determine whether or not to output a start signal to the second timer at the time of the first entry, and to cause the temporary appropriate use condition calculation unit to output a temporary setting signal to the appropriate use condition setting change unit. A usage state of the appearance rate observation area that stores a gas use state that outputs a start signal and enters the appearance rate observation area during operation of the second timer, and further calculates a use condition based on the stored usage state Memory operation unit 15 and current correctness It is composed of a proper use condition temporary storage unit 16 for storing the use condition.

In the above configuration, the proper use condition setting changing unit 11 causes the proper use condition temporary storage unit 16 to store the current proper use condition at the time when the provisional setting signal from the provisional proper use condition calculating unit 14 is input, and the provisional setting. After changing the setting of the signal as an appropriate use condition, the setting of the appropriate use condition is changed according to the signal from the use state storage operation unit 15 in the appearance rate observation area or the signal from the temporary storage unit 16.

This situation will be described with reference to FIGS. 2 and 3.

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 cross mark represents the observed data. Also, the alternate long and short dash line is the maximum limit value. The time T1 from the time t1 to t2 on the horizontal axis indicates the time period of the first Eimer, and the safety factor k (for example, the safety factor k is added to the maximum data p1 of the gas use state observed within the period).
The usage condition M2 is calculated by multiplying k = 1.5). That is,
The proper use condition in the period of T1 is M1, which is the same as the maximum limit value, 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 appearance rate observation area to be monitored. That is, L2 to M2
Up to is the appearance rate observation 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 activate the cutoff means.

At time t3, the data p2 exceeds the level L2 and is within the appearance rate observation area. Here, multiply the data p2 by the safety factor k
M3 is calculated and proper use conditions are provisionally set. At the same time
The second timer starts clocking, and M2 is stored in the proper use condition temporary storage section. The period T2 until the time t4 is the time period of the second timer. The appearance rate observation area in the period of T2 is from L3 to M3, and L3 = L2 remains. During this period, data p3 and p4 are included in the observation area. That is, in the T2 period, since the data in the appearance rate observation area was generated three times or more including p2, when the second timer times out, the maximum value p3 in T2 is multiplied by the safety factor k to obtain M4, The proper usage conditions are newly set. Furthermore, in order to obtain a new appearance rate observation area, the lower limit level
L4 is being calculated. After t4, the same data monitoring as described above is continued.

Here, the condition for changing and re-setting the proper use condition is to generate the data in the appearance rate observation area three or more times in total,
A predetermined number of times may be set according to each cutoff condition, and T2 may be further time-divided to combine the appearance rate observation area data generation patterns within each divided time as a condition. For example, in the latter case, even if the occurrence rate data within the observation area occurs multiple times within each division time, it is judged as once, and when each occurrence is recognized within the entire division time, the appropriate use condition is determined based on the observation data. Change and set again. Also, without waiting for the end of T2 timing,
It may be reset when the change condition is satisfied.

FIG. 3 shows an embodiment in which the provisional setting of the proper use condition is canceled and the original proper use condition is restored when the second timer times out. That is, the change rate condition is not satisfied because the data in the frequency of occurrence observation area occurred only twice in total including p2 within the T2 period. Therefore, the proper use condition M2 stored in the proper use condition temporary storage section is again used as the proper use condition.
Reset it as M5. Therefore, the lower limit level L5 of the appearance rate observation area is the same as L2.

In the above, the calculation result Mn of the usage condition was used as it was for comparison with the appropriate usage condition, but from the fixed plurality of appropriate usage conditions, the one with the closest level of Mn or more was selected and compared. There is also a method.

Further, the lower limit level Ln of the appearance rate observation area may be set by multiplying the proper use condition Mn by a predetermined rate (for example, 80% of Mn), or may be set to a fixed value according to the level of Mn. .

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

In FIG. 4, when the program starts, an initial value is set as a gas proper use condition at 17, then a flow rate is measured at 18, and the use condition of the gas as described above is detected at 19. Then, at 20, it is determined whether or not the first timer for measuring the first predetermined period is counting, and when it is counting,
At 21, the usage status of the gas is memorized. That is, the maximum value of the usage state of the gas corresponding to each usage condition is stored and updated. If it is not counting, at 22 it is determined whether or not the second timer for measuring the second predetermined period is counting, and if it is counting, at 23, the gas usage state in the appearance rate observation area is stored. Go. In addition, when it is not counting at 22 and after passing through 21 and 23, at 24, each gas proper use condition is determined. In 25, when the result of the determination in 24 is abnormal, it branches to 26 and outputs a cutoff signal. When it is not abnormal, it is checked at 27 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. 5 will be described. At 28, it is judged whether or not the first timer count is over, and when it is over, at 29, the output of the operating condition storage arithmetic unit is compared with the initial condition, the smaller one is selected, and at 30 the proper operating condition setting is changed. I do. 31
Then, the lower limit level Ln is calculated in order to obtain the appearance rate observation area of the changed appropriate use condition. If the timer count is not completed at 28, the process branches to 32, and the first
It is determined whether the timer of is currently counting.
If it is counting, continue counting as it is at 33,
If it is not counting, the presence or absence of a start signal is determined at 34. When the activation signal is input, the timer count is started at 35. In addition, when there is no start signal and after passing through 31, 33, and 35, the flow returns to and the program processing is continued from the flow rate measurement of 17.

The branch contents of will be described with reference to FIG. At 36, it is determined whether or not the second timer has finished counting, and at the time of termination, at 37, it is determined whether or not the conditions for changing and re-establishing the proper use conditions are satisfied, and if the conditions are satisfied, the appearance rate. The setting of the proper use condition is changed by the output of the operation state storage operation unit of the observation area, and if the condition is not satisfied, the previously stored proper use condition is temporarily set again. Subsequently, the lower limit level Ln is calculated in order to obtain the appearance rate observation area based on the appropriate use condition changed in 38. Then, at 39, the second timer is reset. When the timer count is not completed at 36, the process branches to 40 to determine whether or not the second timer is currently counting. If it is counting, continue counting as it is at 41, if it is not counting
At 42, it is determined whether or not the usage rate of the appearance rate observation area has occurred. When it occurs, the second timer starts counting at 43, and the current proper use condition is temporarily stored at 44.
Then, at 45, the setting of the proper use condition is changed by the output of the provisional proper use condition calculation unit. If it does not occur at 42, or after passing through 39, 41, 45, return to and continue the program processing from the flow rate measurement at 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. Furthermore, after the first timer has timed out, the appearance rate observation area is set and the data is constantly monitored. If data enters the observation area, provisional proper use conditions are set and the second timer is activated. The specified data measurement is performed, and if the changed conditions are satisfied, the proper use conditions are set again, so even if the gas appliance is replaced or newly installed, the optimum use conditions are automatically corrected. By doing so, there is an effect that the usability can be further improved.

[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 proper use according to another embodiment of the present invention. FIG. 4 is a diagram showing changes in conditions with time, FIG. 4 is a diagram showing a schematic program flow in the embodiment of the present invention, FIG. 5 is a diagram showing a continuation of the program flow of FIG. 4, and FIG. 6 is a program of FIG. FIG. 7 is a functional block diagram of a conventional gas shutoff device showing the continuation of the flow. 1 ... Flow rate measuring means, 2 ... Usage state detection section, 3 ... Initial condition storage section, 4 ... Proper usage condition determination section, 6 ... Start signal application means, 7 ... Usage state storage / calculation section, 9 ...... Shut-off means, 10 ...... First timer, 11 ...... Appropriate use condition setting change unit, 12 ...... Occurrence rate observation area calculation storage unit, 13 ...... Second timer, 14 ...... Temporary proper use condition calculation Part, 15 …… The usage state memory calculation unit of the appearance rate observation area, 16 …… The appropriate usage condition temporary storage unit.

 ─────────────────────────────────────────────────── ─── 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. An initial condition storage unit that stores gas proper use conditions as initial values in advance, and an appropriate use condition determination unit that outputs an interruption signal by determining that the signal of the use state detection unit is abnormal when the signal deviates from the gas proper use. , First
A first timer for counting a predetermined period of time,
A start signal applying means for activating the timer, and a signal from the use state detector for storing the gas use state during the operation of the first timer and for calculating the use condition based on the stored use state In the state storage operation unit, an appropriate use condition setting changing unit that compares the output of the use state storage operation unit and the initial condition and changes the setting of a predetermined value as a new appropriate use condition, and the appropriate use condition setting changing unit. When the appropriate use condition is changed, the changed appropriate use condition is multiplied by a predetermined value to make an appearance rate observation region of the use state, and an appearance rate observation area calculation storage unit, and a second timer for counting a second predetermined period. And a provisional proper use condition calculation unit that calculates the signal of the use state detection unit to temporarily set the proper use condition, and whether or not the signal of the use state detection unit is within the appearance rate observation area is determined. At the time of entering, a start signal is output to the second timer, and a start signal is output to the provisional proper use condition calculation unit to cause the proper use condition setting changing unit to output the provisional setting signal. A usage state storage calculation unit for storing the gas usage state that enters the appearance rate observation area during operation of the second timer, and for calculating usage conditions based on the stored usage state; An appropriate use condition temporary storage unit that stores the appropriate use condition and a shutoff unit that shuts off the gas passage according to a shutoff signal from the appropriate use condition determination unit are provided, and the appropriate use condition setting change unit is the temporary appropriateness condition. When the provisional setting signal from the use condition calculating unit is input, the current proper use condition is stored in the proper use condition temporary storage unit, and the provisional setting signal is changed as the proper use condition. Signal from the use state storage operation unit of the rate observed zone, or a gas shutoff device for setting change proper use condition in accordance with a signal from the temporary storage unit.