JPH0644936B2 - 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 As shown in FIG. 9, a conventional gas shutoff device of this type is as follows.
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 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 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?
When the gas flow rate change is detected every predetermined measurement period, how many kinds of gas appliances are currently used, and what kind of gas flow rate each is identified, and when the maximum gas flow rate among them exceeds the set value , It outputs a closing signal to the shutoff device, and copes 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 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 for a predetermined period is started, and at the same time, the gas use pattern during the period is measured by the operation of the use state storage / calculation unit. That is, during this period, 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 the predetermined value in the use state storage calculation unit, respectively, and gas proper It is sent to the use condition setting change section. In this gas proper use condition setting changing unit, each initial condition is compared with each 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 set 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 Application No. 61-248688).

Problems to be Solved by the Invention However, in the above configuration, the gas consumption pattern of each gas meter installation user within the period when the timer was operating is grasped and each proper use condition of individual correspondence is set, A value that is multiplied by a predetermined value according to each condition, that is,
When the multiplication coefficient is different, there are cases where the interruption condition at the total flow rate becomes smaller than the interruption condition at the individual maximum flow rate, and there is a problem that the setting condition is defective.

The present invention solves the above-described conventional problems, and corrects the calculation result obtained by multiplying each of the flow rate data during operation of the timer by each coefficient, thereby providing a gas shutoff device without the above-mentioned problems. To aim.

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 timer, and a use state detection unit Signal for storing the total flow rate state of the gas flowing in the unit time during the timer operation and calculating the condition based on the stored total flow rate state Similarly, the section stores the individual flow rate state of the gas appliance being used from the change of the gas flow rate per unit time during the timer operation which is equal to or more than a predetermined value, and calculates the condition based on the stored individual flow rate state. An individual maximum flow rate storage operation unit, a condition correction unit that inputs the output of the total flow rate storage operation unit and the output of the individual maximum flow rate storage operation unit, and performs a correction so that the former is equal to or more than the latter condition; A proper use condition setting changing unit that compares each output of the condition correcting unit with the initial condition and changes each setting as a new proper use condition of a predetermined value, and a gas passage according to a cutoff signal from the proper use condition determining unit. It is provided with a configuration of a blocking means for blocking.

The present invention has the above-described configuration, detects the actual gas consumption pattern during the period in which the first timer operates, and based on the data, each proper use condition of the meter-installed household, at least the total flow condition and the individual maximum flow rate. The condition and the condition are set via the condition correction unit. That is, when the total flow rate condition output from the total flow rate storage operation unit is smaller than the individual maximum flow rate condition output from the individual maximum flow rate storage operation unit, the condition correction unit determines the individual maximum flow rate condition as The condition is corrected to the same value or more.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, the elements having the same numbers as those in FIG. 9 are components having the same function. In the present embodiment, the usage state storage calculation part is described by focusing on the total flow rate storage calculation part 10 and the individual maximum flow rate storage calculation part 11. A condition correction unit 12 inputs the output of the total flow rate storage calculation unit and the output of the individual maximum flow rate storage calculation unit, and performs correction so that the former becomes equal to or greater than the latter condition.

FIG. 2 is a diagram for explaining the operation of the condition correction unit, in which the horizontal axis represents the elapsed time and the vertical axis represents the proper use condition represented by the gas flow rate. T1 is the operating period of the first timer,
It is from t ₀ to t ₄ . A gas flow rate Q ₁ is generated at time t ₀ , and Q ₂ is further overlapped and generated at t ₁ . At this point, the total flow rate is Q ₁ + Q ₂ and the individual maximum flow rate is Q ₂ . At t ₂ , Q ₂ disappears, and at t ₃ ,
In addition, Q ₁ has disappeared. Until time t ₄ , the proper use condition of the total flow rate, that is, the total flow rate cutoff condition is LG1.
The cutoff condition for the individual maximum flow rate was LK1. These are initial conditions, and have a relationship of LG1> LK1. In a first time t ₄ is a timer count end point, than it is calculated and set a new cut-off condition based on the data of the respective shutoff condition observed, with respect to the total flow rate of _(Q 1 ₊ Q ₂₎ values Is multiplied by a predetermined coefficient k ₁ , and Q ₂ is multiplied by a predetermined coefficient k ₂ for the individual maximum flow rate. Here, in the case of k ₁ <k ₂ , there may be a case where the calculation result is the total flow rate cutoff condition <the individual maximum flow rate cutoff condition. Therefore, the former is corrected so that it is higher than the latter. After t ₄ , LG2 = LK2.

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. 3 and 4.

In FIG. 3, when the program starts, the initial value is set as the gas proper use condition at 13, then the flow rate is measured at 14, and the use state of the gas as described above at 15, 16; State and individual maximum flow rate state are detected. Then at 17 the first measuring the first predetermined period
It is determined whether or not the timer is counting, and when counting, the gas use states of the total flow rate and the individual maximum flow rate are stored at 18 and 19, respectively. That is, the maximum value of the usage state of the gas corresponding to each usage condition is stored and updated. After exiting 19 and when not counting in 17, each proper use condition is determined in 20. Two
In 1 check whether the above judgment result is abnormal,
In the case of an abnormality, a cutoff signal is output at 22 and a series of processing ends. Further, if it is not abnormal in 21, it is checked in 23 whether or not the proper use condition setting changing unit has been operated, and if it is operated, the process branches to return to the initial process of the routine. If the operation has not been completed, the process proceeds to the process shown in FIG.

In FIG. 4, it is checked at 24 whether or not the first timer has finished counting. If the first timer has finished counting, at 25, the calculation outputs from the total flow rate storage / calculation section and the individual maximum flow rate storage / calculation section are described above. Is corrected and output to the appropriate use condition setting changing unit. At 26, each output from the condition correction unit is compared with each initial condition. In 27, the smaller one is selected and the setting is newly changed as the proper use condition. Then branch to. If the counting is not finished at 24, it is determined at 28 whether the first timer is counting, and if it is counting, the counting is continued at 29 and branched to. If it is not counting, it is checked at 30 whether or not there is a start signal, and if it is, the counting of the first timer is started at 31, and if it is not present, immediately. Branch off.

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

That is, the calculation result of the gas use pattern observed during the first timer operation period is corrected by the condition correction unit so that the total flow rate cutoff condition is always equal to or more than the individual maximum flow rate cutoff condition. The problem as a condition can be solved.

Next, another embodiment of the present invention will be described with reference to FIG. Those having the same numbers as those in FIG. 1 are components having the same function.
In the gas shutoff device, when the proper use condition is changed by the proper use condition setting changing section 32, the appearance rate observation area calculation is performed by multiplying each of the changed proper use conditions by a predetermined value to obtain the appearance rate observation area in the use state. A storage unit 33, a second timer 34 that counts a second predetermined period, a temporary proper use condition calculation unit 35 that calculates a signal of a use state detection unit to temporarily set a proper use condition, and the appearance rate. It is determined whether or not the signal of the usage state detection unit has entered the observation area, and at the time of the first entry, the activation signal to the second timer is output, and the provisional appropriate usage condition calculation unit is provided with the appropriate value. A use signal is output to the use condition setting change unit so as to output a temporary setting signal, and each gas use state that enters the appearance rate observation area during the operation of the second timer is stored, and further, the stored use state is stored. Used based on In order to make the total flow rate condition of the usage rate storage area calculation unit 36 of the appearance rate observation area, the appropriate usage condition temporary storage unit 37 that stores the current appropriate usage condition, and the individual maximum flow rate condition, to be more than the individual maximum flow rate condition. It is composed of a condition correction unit 38 that performs correction.

In the above-described configuration, the proper use condition setting changing unit 32 is configured to use the current proper use condition when the provisional setting signal from the provisional proper use condition calculating unit 35 input without any operation in the condition correcting unit 38 is detected. The condition is stored in the proper use condition temporary storage unit 37, and the temporary setting signal is changed as the proper use condition, and then the signal from the use state storage operation unit 36 of the appearance rate observation area corrected by the condition correction unit, Alternatively, the proper use condition is changed according to the signal from the temporary storage unit 17.

This situation will be described with reference to FIG.

In FIG. 6, the horizontal axis shows the elapsed time, and the vertical axis shows the proper use condition, that is, the level for each breaking condition. The cross indicates the observed maximum individual flow rate data. Also, the alternate long and short dash line is the initial condition. Time T1 from the time t ₁ on the horizontal axis to t ₂ shows a counting period of the first timer, the maximum data p ₁ safety factor to k of the observed gas used state within the period (e.g., k = 1.5) and use condition LK
Seeking 2 That is, the proper use condition in the period of T1 is LK1 or LG1 which is the same as the initial condition,
Data of the individual maximum flow rate compares at time t ₂ LK1 and the LK2 operation result is set to LK2 smaller as a new proper use condition. At the same time, the lower limit level L ₂
Is being calculated. That is, the from L ₂ until LK2 is incidence observation area of individual maximum flow rate. After that, when the gas usage state of the individual maximum flow rate exceeds LK2, the proper use condition determination unit determines that there is an abnormality and outputs a shutoff signal to activate the shutoff means.

At time t ₃ , the data p ₂ exceeds the level L ₂ and is within the appearance rate observation area. Here, the safety factor k is added to the data p _2.
LK3 is obtained by multiplying by and the proper use condition is provisionally set. At the same time, the second timer starts timing and LK2
Are stored in the appropriate use condition temporary storage unit. The period T2 until the time t ₄ is a timing period of the second timer. T2
The appearance rate observation area in the period is from L ₃ to LK ₃ , and L ₃ = L ₂ remains. During this period, the data p ₃ and p ₄ are included in the appearance rate observation area. That is, T
Since the data in the frequency of occurrence observation area including the p ₂ was generated 3 times or more in 2 periods, the maximum value p ₃ in T 2 is multiplied by the safety factor k at the time when the second timer times out, and LK 4
, And the proper use conditions are newly set again. Further, in order to obtain a new appearance rate observation area, the lower limit level L
4 is being calculated. After t _4, the same data monitoring as described above is continued.

By the way, the proper use condition of the total flow rate was still LG2, but at time t ₄ , the calculation result LK4 of the proper use condition of the individual maximum flow rate exceeded LG2, so that the condition correction unit sets LG4 = LK4.

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.

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 FIG. 7 and FIG.

In FIG. 7, the processing units having the same numbers as those in FIG. 3 are the units that execute the same program processing. If the first timer is not counting at 17, it is checked at 39 whether the second timer is counting, and if it is counting, at 40, each of the corresponding appearance rate observation areas is checked. Memorize the usage status of the gas shutoff condition. If 39 is not counting, the process proceeds to 20 for appropriate use condition determination processing. Further, if the appropriate use condition setting changing unit has been operated at 23, the process branches to. If the operation has not been completed, the process branches to.

In the process shown in FIG. 4, after changing the setting of the proper use condition of 27 in the process shown in FIG. 4, the lower limit level Ln is calculated and branched to obtain the appearance rate observation area of the changed proper use condition. ing. Other processes are the same.

FIG. 8 shows the contents of processing in. At 41, it is determined whether or not the second timer has finished counting, at the time of termination, at 42, the timer is reset, and at 43, it is determined whether or not a condition for changing and resetting the proper use condition is satisfied, If the condition is satisfied, the cutoff condition is calculated from the usage state of the appearance rate observation area at 44, and then the condition is corrected at 45. That is, the total flow rate condition is corrected so as not to be smaller than the individual maximum flow rate condition. In 46, the corrected result is newly reestablished as a proper use condition. At 47, the appearance rate observation area corresponding to the appropriate use condition is calculated and set. If the condition is not satisfied at 43,
At 48, the previous proper use condition temporarily stored and retained is returned. If the timer count is not completed at 41, the process branches to 49 to determine whether or not the second timer is currently counting. If it is counting, it continues to count at 50, and if it is not counting, it counts as 51.
At, it is determined whether the usage rate of the appearance rate observation area has occurred. If it occurs, the second timer starts counting at 52, and the current proper use condition is temporarily stored at 53. Then, at 54, the setting of the proper use condition is changed by the output of the provisional proper use condition calculation unit. Further, if it does not occur at 51 or after passing through 47, 48, 50 and 54, 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 another embodiment of the present invention can be realized.

In the above-mentioned embodiment, the appearance rate observation area is set to a predetermined range below that including the proper use condition. However, in addition to the appearance rate observation area, a data generation check level is provided further below, and data of the above level or higher is provided. If does not occur for a predetermined period, the program may be initialized and restarted from the first timer operation.

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

(1) It is possible to detect gas leakage and combustion extinction by constantly monitoring the gas usage state and comparing it with the set appropriate usage conditions.
When it is determined that there is an abnormality, the shut-off 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, by the start signal, the actual use pattern of the gas supply system in which the gas meter is installed is observed for the predetermined time of the first timer,
Since the maximum value and the initial value are compared, the total flow rate condition and the individual maximum flow rate condition are calculated, correction is made, and the predetermined value is reset as the proper use condition, so there is no problem in setting the cutoff condition. Is eliminated, and individual special conditions are taken into consideration in comparison with conditions that were simply determined by the gas meter capacity (number of issues), so the safety level against gas accidents can be further increased. it can.

(2) 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 set. It operates and measures the prescribed data, and when the changed conditions are satisfied, the condition correction is added and the proper use conditions are reset, so even if the gas appliance is replaced or newly installed, the condition setting is performed. By automatically correcting to the optimum usage conditions without the above problems,
This has the effect of further improving usability.

[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 view showing the continuation of the program flow of FIG. 3, FIG. 5 is a functional block diagram of a gas shutoff device in another embodiment of the present invention, and FIG. 6 is proper use in another embodiment. FIG. 7 is a diagram showing changes in conditions with time, FIG. 7 is a diagram showing a schematic program flow in another embodiment of the present invention, FIG. 8 is a diagram showing a continuation of the program flow in FIG. 7, and FIG. 9 is a conventional gas. It is a functional block diagram of a blocking device. 1 ... Flow rate measuring means, 2 ... Usage state detection section, 3 ... Initial condition storage section, 4 ... Proper usage condition determination section, 5 ... First
Timer, 6 ... Start-up signal applying means, 8 ... Appropriate use condition setting changing section, 9 ... Breaking means, 10 ... Total flow rate memory computing section, 11 ... Individual maximum flow rate memory computing section, 12 ...
Condition correction unit 33 ... Appearance rate observation area calculation storage unit 34 ...
… Second timer, 35 …… Temporary appropriate use condition calculation unit, 3
6 ... Use state storage / calculation unit of the appearance rate observation area, 37 ... Temporary storage unit for appropriate use conditions.

 ─────────────────────────────────────────────────── ─── 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 (2)

[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 predetermined period, a start signal applying means that starts the timer, and a total flow rate state of gas flowing in a unit time during the timer operation by a signal from the usage state detecting section. A total flow rate storage calculation unit that stores and calculates a condition based on the stored total flow rate state, and an individual gas appliance that is used from a change in the gas flow rate per unit time during the timer operation that is equal to or greater than a predetermined value. The flow rate state is stored and an individual maximum flow rate storage computation section that calculates a condition based on the stored individual flow rate state, an output of the total flow rate storage computation section and an output of the individual maximum flow rate storage computation section are input. The condition correction unit that performs correction so that the former becomes equal to or greater than the latter condition is compared with each output of the condition correction unit and the initial condition, and each predetermined value is set as a new proper use condition. And the proper use condition setting changing unit that further,
A gas shutoff device, comprising: shutoff means for shutting off the gas passage in response to a shutoff signal from the appropriate use condition determination unit. 2. An appearance rate observation area calculation storage unit which, when the appropriate use conditions are changed by the appropriate use condition setting changing unit, multiplies the changed appropriate use conditions by a predetermined value to obtain an appearance rate observation area in a use state. 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 each proper use condition, and each of the appearance rate observation areas. It is determined whether or not a signal from the usage state detection unit is input, and when the signal is input for the first time, a start signal to the second timer is output, and the provisional appropriate use condition calculation unit is notified to the appropriate use condition setting change unit. A starting signal is output to output a temporary setting signal, and each gas usage state that enters the appearance rate observation area during the second timer operation is stored, and
The condition correction unit has an appearance rate observation area use state storage operation unit for calculating use conditions based on the stored use state, and an appropriate use condition temporary storage unit for storing current appropriate use conditions. The gas shutoff device according to claim 1, wherein correction is performed so that the total flow rate condition of the proper use condition is equal to or more than the individual maximum flow rate condition with respect to the output of the usage state storage / calculation unit in the rate observation area.