JPH0730917B2 - 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 gas meter 2 in the gas supply line 1 and a flow rate measuring means 3 which emits a signal according to the amount of gas passing through the gas meter,
A shut-off means 4 for stopping the supply of gas is provided, and the shut-off means 4 is judged to be abnormal if the usage condition is judged by the flow rate signal of the flow rate measuring means 3 and deviates from the preset gas proper usage condition stored in advance. It was equipped with a control unit 5 for issuing a closing signal. Further, the control unit 5 carries out signal transmission with the external communication device 6.

FIG. 5 shows a configuration example of this conventional control unit. Those having the same numbers as in FIG. 4 are components having the same function. The control unit 5 receives the flow rate signal from the flow rate measuring unit 3 and detects the usage state of the gas, and the initial condition setting that sets appropriate usage conditions in advance according to the number of the gas meter. Data communication control between an external device and a unit 8, a proper use condition determination unit 9 that determines that the signal from the use state detection unit 7 deviates from the proper gas use condition, and outputs a cutoff signal. It is composed of a communication control unit 10 for performing.

Here, the proper use condition indicates each condition item 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 condition is to activate the shut-off means when the total gas flow rate that passes through the gas meter within the predetermined measurement period exceeds a predetermined value that is initially set when the gas hose is pulled out or the gas appliances burn out. . The individual maximum flow rate condition is to detect the gas flow rate change for each predetermined measurement period, identify how many kinds of gas appliances are currently used, and identify how much gas consumption is used for each, and determine the maximum gas among them. When the consumption exceeds a predetermined set value, a shutoff signal is output to the shut-off means to deal with gas leaks such as cracks in the gas hose and combustion extinction when the gas plug is half open. In addition, the safety continuous use time condition refers to the continuous usable time set for each range from the statistical data of the time when a gas appliance in a certain combustion range is continuously used, and the data from the use state detection unit 7 When the above-mentioned set time is exceeded, an operation signal is sent to the shut-off means to ensure safety even when the gas appliance is forgotten to be turned off.

As described above, the usage state detection unit 7 observes the total flow rate, the individual maximum flow rate, and the continuous use time, and the appropriate use condition determination unit 9 of 9 performs a comparison determination with the initial value, thereby the gas supply system Had detected an anomaly. In addition, the communication control unit 10
Is an external communication device (for example, a handy checker,
Alternatively, a signal is transmitted to and from a host computer that performs signal transmission using a line, and a cutoff signal is output to the cutoff unit in response to a request from the communication device, or the determination unit determines that there is an abnormality. Information was output as data.

Problems to be Solved by the Invention However, in the above-mentioned configuration, since the proper use condition is uniformly determined only by the initial value depending on the capacity of the gas meter installed in the gas pipe, it is not possible to use it in a home where the meter is installed. There was a problem that special conditions were not incorporated.

The present invention solves such a conventional problem, and the flow rate pattern of the gas actually used in each home is measured for a predetermined period of time, and although it is a severe eye, a judgment condition that matches the actual condition is obtained by comparing the actual condition with the initial condition. The purpose of the present invention is to provide a safer gas shutoff device by resetting.

Means for Solving the Problems In order to solve the above problems, the gas shutoff device of the present invention is
Flow rate measuring means 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 the usage state of gas by the flow rate signal sent from the flow rate measuring means, and proper gas usage conditions Is set as an initial value in advance, an appropriate use condition determination unit that outputs an interruption signal when the signal of the use state detection unit deviates from the gas proper use condition and outputs a cutoff signal, and a timer that counts a predetermined period. , A start signal applying means for starting the timer, a use state storage section for storing a gas use state during the timer operation by a flow rate signal sent from the flow rate measuring means, a classification judgment based on the contents of the storage section, and a corresponding coefficient Is selected and calculated to determine the judgment conditions, and is changed as the gas proper use condition, the gas proper use condition changing unit and the shielding from the proper use condition judging unit are selected. A configuration in which a blocking means for blocking the gas passage in accordance with the signal.

Operation According to the present invention, when the activation signal is applied to the timer, the present invention starts counting for a predetermined period, and at the same time, the gas usage pattern during the timer operation is measured by the operation of the usage state storage unit. That is, during this period, the measured values of the above-mentioned total flow rate, individual maximum flow rate, continuous use time, etc. are updated, and at the same time as the timer ends, the final data is compared and judged with the initial value by the gas proper use condition changing unit. The predetermined gas proper use condition is newly set. In setting, the judgment condition is reset by multiplying the final data by a coefficient, and the coefficient is selected from the values prepared in advance by comparing the final data with the initial condition. By doing so, even if the final data is much lower than the initial condition, premature disconnection can be prevented by increasing the coefficient. After that, the proper use condition determination unit compares the new set condition with the signal from the use state detection unit, and when the condition is not satisfied, determines that the condition is abnormal and activates the shutoff means.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, the same reference numerals as those in FIG. 4 are components having the same function. The control unit 16 inputs a flow rate signal from the flow rate measuring unit 3 similar to the conventional one and detects a usage state of gas, and an initial condition setting unit 8 that presets gas proper usage conditions as initial values. And an appropriate use condition determination unit 9 that outputs an interruption signal by determining that the signal from the use state detection unit deviates from the gas proper use condition and determines that it is abnormal.
A timer 11 for counting a predetermined period, a start signal applying means 12 for starting the timer 11, and a use state storage section for storing a gas use state during the timer operation by a flow rate signal sent from the flow rate measuring means 3. 13 and a gas proper use condition changing unit 14 that changes the gas proper use condition according to the contents of the storage unit.

In the above configuration, the activation signal is sent to the timer that activates the activation signal applying means 12 (for example, the push button switch), and the timer receives the signal and starts counting for a predetermined period. The predetermined period is set in advance and has a span of, for example, one week or one month. At the same time when this timer is activated, the usage status storage unit 13
Stores the gas usage pattern, that is, the total flow rate, the individual maximum flow rate, and the continuous use time. The gas appropriate use condition changing unit 14 stores the maximum value of the actually measured gas use pattern, and therefore updates the data. In this way, when the timer finishes counting, the final data is transferred from the storage unit to the proper use condition changing unit.
Sent to 14. The changing unit 14 compares the initial condition with the final data and selects the one with the smaller value, that is, resets a new proper usage condition on the safer side. That is, until the above-described timer count ends, the abnormality determination unit 9 determines the abnormal state by comparing the current gas usage state with a preset initial value. After selecting the maximum data from the measured results and considering the usability of actual use and multiplying it by a predetermined constant, the judgment condition will be changed again.
It is judged as an abnormal state by comparing with the reset value.

Here, when it is determined that there is an abnormality, the shutoff means 4 is activated in response to the signal and the gas passage is closed.

In the above, the determination condition is a value obtained by multiplying the maximum data of the actual measurement results by a predetermined coefficient, and the method of determining the predetermined coefficient will be described below.

First, the initial condition is divided into n divisions, and the maximum data in the actual measurement result is compared with the initial condition divided into n divisions to determine which division they belong to. Then, the maximum data in the actual measurement result is multiplied by the coefficient corresponding to the category to which it belongs, and a new determination condition is set when the conditions are not exceeded. If the value of the coefficient corresponding to the segment is increased as the content value of the segment becomes smaller, premature disconnection and false disconnection can be prevented. FIG. 2 is an example of the safety continuation time and will be described below. The initial conditions are
The flow rate Q1 is cut off at the duration t1, but it is assumed that the maximum value is tm as a result of actually measuring the flow rate pattern. The tm belongs to dm in t1 divided into n, and the coefficient corresponding to dm
If km is multiplied by tm and t1> tm × km, a new judgment condition for flow rate Q1 will be set. At that time, corresponding to d1> d2 ...> dm, k1 <k2 ...
If <km is set, the coefficient becomes larger as the actual measurement result becomes smaller, so the value to be reset becomes larger than multiplying by a uniformly determined coefficient. Can be prevented. The above can be applied to the total maximum flow rate and the individual maximum flow rate.

The control unit described above can be easily realized by using a calculation or judgment function by a program operation of a microcomputer or the like. Hereinafter, FIG. 3 shows a schematic program flow.

When the program starts, an initial value is set as a gas proper use condition in A, a flow rate is measured in D, and a use state of the gas as described above is detected in E. Then, at F, it is determined whether or not the timer for a predetermined time is counting, and when counting, the usage state of gas is stored at G. That is, the maximum value of the usage state of the gas corresponding to each usage condition is stored and updated. Then, H is used to determine each gas proper use condition. If not counting, jump to H immediately. In I, when the result of H determination is abnormal, it branches to J and outputs a cutoff signal. When it is not abnormal, it is checked in K whether the proper use condition changing portion has operated, and when it has been operated, the process returns to h1. When the change unit has not been operated, L determines whether or not the timer has finished counting, and when it finishes, compares the usage state stored in M1 with the initial condition and determines the category, and M2 determines the coefficient according to the category. Choose. Next, N is used to change the gas proper use condition to a predetermined value. As described above, the maximum value of each stored pattern is compared with the initial value, and, for example, the smaller value is selected and reset. After that, in H, the reset value is treated as a gas proper use condition, and compared with the detected value. If the timer count is not completed at L, the process branches to O to determine whether the timer is currently counting. When the counting is in progress, the counting continues as it is in P, and when it is not counting, the presence or absence of the start signal is determined in Q. If there is still no signal,
Return to h1. By executing this program flow, the function of the control unit 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.

(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, if it is determined to be abnormal. Since the shut-off means operates to stop the gas, it is possible to prevent a dangerous state such as gas explosion or gas poisoning.

(2) When determining the judgment conditions, by multiplying the final data within the actual measurement time by a coefficient according to the category in comparison with the initial conditions, premature disconnection / erroneous disconnection can be performed when the flow rate is small and the usage time is short. Can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas shutoff device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an embodiment at the same safety continuation time,
FIG. 3 is a diagram showing a schematic program flow of a control unit of the apparatus, FIG. 4 is a block diagram of a conventional gas shutoff device, and FIG. 5 is a block diagram of a conventional control unit. 2 ... Gas meter, 3 ... Flow rate measuring means, 4 ... Shutoff means, 7 ... Usage state detecting section, 8 ... Initial condition setting section, 9
...... Appropriate use condition determination unit, 11 ...... Timer, 12 ...... Starting signal applying means, 13 ...... Use state storage unit, 14 …… Adjust use condition changing unit, 15 ...... Communication control unit, 16 ...... Control unit .

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 setting unit for preliminarily classifying and setting the gas proper use condition as an initial value, and a proper use for judging that the signal of the use state detection unit is abnormal when the signal of the use state detection unit is abnormal and outputting a cutoff signal. A condition determining unit, a timer for counting a predetermined time, a start signal applying unit for starting the timer, and a use state storage unit for storing a gas use state during the timer operation by a flow rate signal sent from the flow rate measuring unit. When selecting the maximum value of the usage condition and multiplying it by a coefficient to determine an appropriate usage condition, it is determined which category of the initial condition setting unit the output signal of the usage condition storage unit belongs to. A gas appropriate use condition changing unit that determines a proper use condition when the stored condition is selected and the stored condition is selected and the determination condition is calculated and the initial condition from the initial condition setting unit is not deviated. A gas shutoff device comprising: shutoff means for shutting off a gas passage in response to a shutoff signal from a proper use condition determination unit.