JPH0731553B2 - 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 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 the capacity of each gas meter, the total flow rate set according to the gas appliance owned by the gas user, the maximum flow rate of each individual, and the 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. 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 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 will be sent to the circuit breaker 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 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 multiplied by the use state storage calculation value by the predetermined value It is sent to the changed condition settings. In this gas proper use condition setting changing unit, the predetermined condition is newly set by comparing the initial condition with the data for the stored calculation. 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 Unexamined Patent Publication No. 63-101617) Problem to be Solved by the Invention However, in the above configuration, the gas consumption pattern of each meter-installing user within the period when the timer is operating is grasped and individually handled. However, if the gas appliance is replaced or is no longer used after the time-out, the above condition is 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 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 amount, the initial condition storage unit that stores the gas proper use condition as an initial value in advance, and the signal of the use state detection unit indicates the gas proper use condition. 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 calculation 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. After the proper use condition is changed by the proper use condition setting changing unit, the range of the changed proper use condition and the value obtained by multiplying the proper use condition by a predetermined value less than 1 is set. A monitoring area calculation storage unit that is a monitoring area of the usage state, a second timer that starts counting for a second predetermined period, and a signal that determines whether or not the signal of the usage state detection unit has entered the monitoring area. When a signal indicating the end of counting is output from the second timer, a monitoring area data appearance observing unit that resets the second timer and restarts the counting every time the At parts in accordance with the proper use condition when the second timer count end are those having a structure that resets a new proper use condition.

Further, in the gas shutoff device of the present invention, when the count end signal is output from the second timer, the proper use condition setting changing unit causes the proper use condition at the end of the second timer count to be multiplied by a predetermined number. Then, a configuration is provided in which new proper use conditions are reset.

Further, the gas shutoff device of the present invention stores a gas use state during the operation of the second timer and calculates a use condition based on the stored use state. It is determined whether or not the signal of the use state detection unit is input into the monitoring area, and each time the signal is input, the storage information of the second use state storage operation unit is initialized and the second timer is reset to count. And a monitoring area data appearance observing section for restarting the operation, and when the count end signal is output from the second timer, the proper use condition setting is performed according to the signal from the second use state storage operation section. The changing unit resets the proper use conditions.

Effect The present invention has the above-described configuration to first detect an actual gas consumption pattern in the period in which the first timer operates and set the proper use condition of the meter-installed household based on the data, and at the same time after the time-out. Also constantly monitors the gas usage state entering the monitoring area, and resets and restarts the count of the second timer each time the gas flow rate data in the monitoring area is generated. And a second predetermined period,
When the data in the monitoring area is not observed, the proper use condition setting changing unit newly resets the proper use condition.

Further, for the resetting of the new proper use condition, a proper multiple of the proper condition at the end of the second timer count is applied, or the use condition is calculated based on the gas use state during operation of the second timer. Etc. are taken.

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. 10 are components having the same function. However, 10 first timers and 11 start signal applying means are 5 timers,
And, it has the same function as the same means of 6. 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. It consists of 15 and.

In the above configuration, when the count end signal is output from the second timer 14, the appropriate use condition setting changing unit 12
Then, the proper use condition, that is, the cutoff condition is reset.

Next, when changing the setting of the proper use condition when the second timer counts over, a state in which the proper use condition at the end of counting is multiplied by a predetermined value to obtain a new proper condition 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 χ 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.
5) is multiplied to find the proper use condition M2. That is, T
Proper use condition in the period of 1 is M1 same as the initial condition,
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, in order to obtain the data monitoring area, the lower limit level L2 is calculated by multiplying the proper use condition M2 by a predetermined value (for example, 0.3, that is, 30%). In other words, the monitoring area is from L2 to M2. After that, when the gas use state exceeds M2, the proper use condition determination unit determines that there is an abnormality and outputs a shutoff signal to activate the shutoff means.

Timer 2 starts counting from time t2, but at time t3
Since the data p2 in the monitoring area has been generated, the count is reset. T2A is a time period until the reset. Subsequently, the timer 2 restarts counting from time t3. However, since the data p3 exceeding the level L2 is generated at the time t4 similarly to the above, the count is reset. T2B is a time period from t3 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, at time t5, the previous proper use condition M2 is multiplied by a predetermined value d (for example, 0.8) to obtain a new proper use condition M3. Then, in order to obtain the data monitoring area under the new proper use condition, the proper use condition M3 is set to a predetermined value (for example, 0.3, that is, 30).
%) To calculate the lower limit level. This is the lower limit level of the monitoring area.

After time t5, the second timer starts again and restarts counting, but since the data p4, p5, p6 in the monitoring area are generated at each time t6, t7, t8, count at each time. It has been reset. Counting periods until resetting are T2C, T2D, and T2E, respectively.

The above 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. At the time of the end, at 26, the timer count is stopped, and at 27, the output of the usage state storage / calculation unit is compared with the currently applied proper usage conditions. , Select the smaller one, and change the setting of the proper use condition at 28. 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, the count continues as it is at 32, and if it is not counting, the presence or absence of the start signal is determined at 33.
When the activation signal is input, the counting of the first timer is started at 34. When there is no start signal and after passing through 30, 32 and 34, the process 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 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 proper use condition currently applied is multiplied by a predetermined value d to obtain a new value. It is set again as a proper use condition. After that, the flow branches to that of FIG. 4, a new data monitoring area is calculated, and the second timer is started. When the timer count is not completed at 35, the process branches to 38 to determine whether or not data has occurred in the data monitoring area. If so, the process branches to 39 to reset and start the second timer count. . If no data is generated at 38, the second timer continues counting at 40. After passing through 39 and 40, 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.

Therefore, when the second timer period, the predetermined gas flow rate, or the data of less than the predetermined use time is observed, a new cutoff level is set immediately after the end of the second timer period. This has the effect that data monitoring can be continued under various conditions. The predetermined value d may be changed for each interruption condition or may be variable.

Next, another embodiment of the present invention will be described with reference to FIG.
Components having the same numbers as in FIG. 1 have the same functions. 41 is a second timer for measuring the second predetermined period. Reference numeral 42 is a second use state storage operation unit that stores the use state of the gas during operation of the second timer 41 and calculates use conditions based on the stored use state, and 43 is a monitor determined by 13. It is determined whether or not the signal of the use state detection 2 is input into the area, and every time the signal is input, the storage information of the second use state storage operation unit 42 is initialized and the second timer 41 is reset. It is a monitoring area data appearance observation unit that restarts counting. Reference numeral 44 denotes a proper use condition setting changing unit, which resets the proper use condition according to the calculation result of the second use state storage calculating unit 42 when the second timer counts over.

Next, when changing the setting of the proper use condition when the second timer counts over, the operating state of FIG.
This will be described with reference to the figure. The state up to time t4 is the same as in FIG. However, during the second timer operation period, the gas use state is stored by the second use state storage / calculation unit, and p4 is stored as the maximum value during the period from t4 to t5. At time t5 when the second timer finishes counting, the value p4 is multiplied by the safety factor k to reset a new proper use condition, that is, the cutoff level M3. Here, the lower limit value L3 of the monitoring area is newly calculated and set.

After time t5, the second timer starts again and restarts counting, but since the data p5, p6, p7 in the monitoring area are generated at each time t6, t7, t8, count at each time. It has been reset. Counting periods until resetting are T2C, T2D, and T2E, respectively.

The above contents can be easily realized by using the calculation and judgment functions by the program operation of the microcomputer or the like, and the outline of the program flow is shown in FIGS. 8 and 9 below.

In FIG. 8, processing elements having the same numbers as those in FIG. 3 have the same execution content. At 19, if the first timer is not counting, the process branches to 45, and it is determined whether or not the second timer is counting. When it is counting, at 46, the second use state memory is stored. The operating unit stores the usage state. Further, the program processing is restarted from 21 when it is not counting at 45 and after passing through 46.

The branch processing contents of are the same as in FIG.

The branching process will be described with reference to FIG. Processing elements with the same numbers as in FIG. 5 have the same execution content. In 48, the storage information of the second use state storage / calculation unit, that is, the maximum data in the second predetermined period is multiplied by a coefficient to newly calculate and set the proper use condition. Next, at 49, a new data monitoring area is calculated and stored. At 50, the storage information of the second usage state storage / calculation unit is initialized, that is, cleared.

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

EFFECTS OF THE INVENTION As described above, according to the gas shutoff device of the present invention, the following effects are obtained.

(1) Gas leakage and combustion extinction can be detected by constantly monitoring the gas usage state and comparing it with the set appropriate usage conditions. If the conditions are deviated, that is, it is judged as abnormal. 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. Also, the start signal is used to observe the actual usage pattern of the gas supply system in which the gas meter is installed for a predetermined time of the first timer, and the observed data (for example, maximum value) is compared with an initial value to obtain a predetermined value. Is set as an appropriate usage condition, so it is judged by considering individual special conditions, in comparison with the conditions that were uniformly determined by the combustion amount of the gas appliances and the capacity (number of gas meters) of the gas appliances. Therefore, the safety level against a gas accident can be further increased. 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 set by the second timer. When the count time is exceeded, the proper use conditions are reset again. That is,
If the gas consumption decreases, or if you replace the equipment with a smaller amount of combustion, you can automatically deal with it, and the gas cutoff level will be set on the safer side. Furthermore, there is an effect that the data observation can be continued immediately under an appropriate cutoff condition by applying the cutoff condition applied when the second timer has finished counting by a predetermined multiple.

(2) Further, by storing the gas use state during the second timer operation and calculating the proper use condition based on the stored use state, the cut-off level according to the gas actual use state of the gas user can be obtained. It can be set, and more appropriate re-setting is possible on the safety 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 diagram showing the same apparatus in another embodiment of the present invention. FIG. 7 is a functional block diagram, FIG. 7 is a diagram showing changes over time in proper use conditions of the same apparatus in FIG. 6, FIG. 8 is a diagram showing a schematic program flow in FIG. 7, and FIG. 9 is a program flow in FIG. FIG. 10 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 ... Breaker, 10 ... 1st timer, 11 ... Activation signal applying means, 12, 44 ... Appropriate use condition setting changing section, 13 ... Surveillance area calculation storage section, 14, 41 ... Second
Timer, 15, 43 ... Monitoring area data appearance observation section, 42 ...
... Second usage state storage / calculation unit.

Front Page Continuation (72) Inventor Hiroshi Horii 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inside the Oil and Gas Research Institute (72) Inventor Mitsuo Namba 2-16-4 Tadao, Machida, Tokyo Metropolitan Gas Safety Association Liquefied Oil and Gas Research Institute (72) Inventor Reihei Uematsu 2-16-4 Tadao, Machida, Tokyo No. High Pressure Gas Safety Association, Liquefied Petroleum Gas Laboratory (56) Reference JP-A-1-308575 (JP, A) JP-A-63-127018 (JP, A) JP-A-63-101619 (JP, A) Kai 63-127020 (JP, A)

Claims (3)

[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. And a range of a value obtained by multiplying the changed proper use condition and the proper use condition by a predetermined value less than 1 after the proper use condition is changed by the proper use condition setting changing unit. Is used as a monitoring area for the monitoring area, a second timer for starting counting for a second predetermined period, and whether or not a signal from the usage status detecting section has entered the monitoring area is determined. A monitoring area data appearance observing unit that resets the second timer and restarts counting each time a signal is input,
The gas shutoff device resets the proper use condition according to the proper use condition at the end of the second timer count when the count end signal is output from the timer. 2. When a count end signal is output from the second timer, the proper use condition setting changing unit multiplies the proper use condition at the end of the second timer count by a predetermined number to newly make a proper use. The gas shutoff device according to claim 1, wherein the condition is reset. 3. A second use state storage calculation unit for storing a gas use state during operation of a second timer and calculating a use condition based on the stored use state, and the use state in the monitoring area. A monitoring area in which it is determined whether or not a signal from the detection unit is input, and each time a signal is input, the storage information of the second usage state storage / calculation unit is initialized, and the second timer is reset to restart counting. A data appearance observing section, and when a signal indicating the end of counting is output from the second timer, the proper use condition setting changing section appropriately uses the signal in accordance with the signal from the second use state storage calculating section. Claim 1 wherein the condition is reset
The gas shutoff device according to the item.