JPH0648090B2 - 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.
Gas meter 2 in the gas supply line 1 and flow rate measuring means 3 for issuing a signal according to the amount of gas passing through the gas meter 3.
And a shutoff means 4 for stopping the supply of gas is provided, and the flow rate signal of the flow rate measuring means 3 is used to determine the usage state. It was equipped with part 5.

An example of the configuration of the conventional control 5 is shown in FIG. Those having the same numbers as in FIG. 3 are components having the same function. The control unit 5 receives a flow rate signal from the flow rate measuring unit 3 to detect a gas use state, a use state detection unit 6, an initial condition setting unit 7 that sets appropriate use conditions as initial values in advance, and the use state. When the signal of the state detection unit 6 deviates from the proper use condition, it is determined to be abnormal, and the proper use condition determination unit 8 that outputs a shutoff signal to the shutoff unit 4 and the flow rate signal sent from the flow rate measurement unit 3 use the gas. It is composed of a usage state storage unit 9 that stores a history of states, and an appropriate usage condition changing unit 10 that derives and changes the appropriate usage conditions based on a gas usage pattern obtained from the usage state storage unit 9.

In the above-mentioned configuration, the condition changing period in the proper use condition changing unit 10, that is, the learning period, may be only a fixed period after the initial setting of the present apparatus, or the proper use condition is changed each time according to the use pattern. Good.

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 gas flow rate 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, the circuit breaker was activated. Let 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 is sent to the shutoff means to ensure safety even if the gas appliance is forgotten to be turned off.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, when the usage pattern under the environment where the gas meter is installed changes significantly after the learning period ends, or even during the learning period, the gas flow rate is not measured at all. In this case, deriving and changing the proper use conditions based on the gas use pattern is meaningless. That is, the gas usage pattern as time-series data is treated as a macroscopic continuous amount.However, for example, when the gas unused state continues for a long time due to moving etc. Even if it is continuous, there is a problem that it cannot be distinguished.

The present invention solves such a conventional problem, and when a gas unused state continues for a certain period of time or longer, a safer gas shutoff device is provided by discarding the proper use conditions derived by learning so far. The purpose is to provide.

Means for Solving the Problems In order to solve the above problems, the gas shutoff device of the present invention, when the gas is in an unused state, counts the duration of time in the unused state and after a predetermined time or more, proper use conditions The configuration is newly provided with an unused state confirmation unit for changing the proper use condition to the initial setting value again for the change unit.

Effect The present invention, by the above-described configuration, starts the time measurement each time the unused state confirmation unit changes from the gas use state to the unused state, and if the gas use state is restored by the predetermined time, stops the time measurement and the counter value. The operation of clearing is repeated.
However, if the unused state continues for a predetermined time or longer, the appropriate use condition changing unit discards the value of the appropriate use condition derived by learning so far and sets the appropriate use condition to the initial setting value again. Since the signal is sent to change it again, the gas usage pattern is newly treated as different from the conventional one.

Embodiments Embodiments 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. 4 are components having the same function. The control unit 11 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 7 that presets gas proper usage conditions as initial values. And a flow rate sent from the flow rate measuring means 3 and a proper use condition judging section 8 which judges that the signal of the use state detecting section 6 is abnormal when it deviates from the gas proper use condition and outputs a shutoff signal to the shutoff means 4. The use state storage unit 9 that stores the gas use state from the signal, the proper use condition change unit 10 that changes the gas proper use condition according to the contents of the use state storage unit 9, and the use state detection unit 6 If it is in an unused state, the duration is counted, and after a predetermined time or more, the proper use condition section 10 reconfigures the proper use condition to the initial setting value. There.

In the above configuration, the usage state storage unit 9 stores the gas usage pattern under the environment where the gas meter is installed, that is, the total flow rate, the individual maximum flow rate, the continuous usage time, etc. during the learning period. The proper use condition changing unit 10 refers to these data, and gradually changes the initial set values of the proper use condition given in advance by the initial condition setting unit 7, while changing the proper use condition according to the current gas use pattern. That is, the learning period is set to be two weeks after the initialization operation by the initial condition setting unit 7. However, if the unused state continues for a predetermined time or longer (for example, one month) after the learning period ends, the unused state confirmation unit 12 determines that the gas usage pattern has changed from the conventional one, and has been derived by learning so far. Since the value of the obtained proper use condition is discarded and a signal is sent to change the proper use condition to the initial setting value again, the gas use pattern can be newly treated as different from the conventional one. Further, after the operation of initializing the proper use condition by the unused state confirmation unit 12, if the gas flow rate is detected, that is, if the state returns to the use state again, the learning may be newly started from this point.

The above-described operation of the control unit can be easily realized by using a calculation or judgment function by a program such as a microcomputer. FIG. 2 shows a schematic flowchart below.

When the program starts, first, in step 201, an initial value is set as an appropriate gas usage condition, then in step 202 the flow rate is measured, and in step 203 the gas usage state as described above is detected. Further, if the gas is currently in use in step 204, the unused timer is cleared in step 205, but if it is in the unused state, the unused timer is updated in step 206 to measure the duration of the unused state. .
When this continuation time has passed a predetermined time (for example, one month), the process returns to the initial condition setting of step 201 to initialize the proper use condition. (Step 207) If it is determined in step 207 that the predetermined time has not elapsed or if the gas is in use, the appropriate use condition is determined in step 208, and if it is determined to be abnormal, the cutoff signal is output. (Step 209,
210) On the other hand, if it is determined that there is no abnormality, the process proceeds to step 211. In step 211, it is determined whether or not the learning period is currently in progress, and if the learning period has already ended, the flow returns to the next flow rate measurement in step 202 with the proper use condition fixed. If it is during the learning period, the usage history is stored according to the usage detected in step 203 (step 212), and after changing the appropriate usage conditions (step 213), the flow rate measurement in step 202 is performed. Return to. Note that the flow rate measurement in step 202 is performed at regular sampling intervals, and by executing this flowchart, it is possible to realize the control unit function of the gas shutoff device of the present invention.

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

(1) If there is a long period of unused gas and it can be clearly considered that it is necessary to distinguish the gas use pattern from the past and the gas use pattern expected in the future, it can be learned by learning from the past gas use pattern. Proper use conditions can be rejected once, and when a gas use state is entered in the future, a new gas use pattern can be dealt with, and as a result, the proper use conditions can be reset on the safer side. That is, there is an effect that a dangerous state such as gas explosion or gas poisoning can be prevented in advance.

(2) Since the initialization operation can be automatically performed under proper use conditions when the gas user is absent for a long period of time or moves, even if the resident changes once the gas shutoff device is installed, that is, the gas usage pattern. There is an effect that a large discontinuous change occurs and the operation can be performed without maintenance.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas shutoff device according to an embodiment of the present invention, FIG. 2 is a schematic flowchart of a control unit of the device, FIG. 3 is a configuration diagram of a conventional gas shutoff device, and FIG. It is a block diagram of a gas shutoff device. 2 ... Gas meter, 3 ... Flow rate measuring means, 4 ... Shutoff means, 6 ... Usage state detecting section, 7 ... Initial condition setting section, 8
…… Appropriate use condition judgment part, 9 …… Use condition storage part, 10 ・ ・ ・
… Appropriate use condition change section, 11 …… Control section, 12 …… Unused state confirmation section.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location G08B 21/00 W 7319-5G (72) Inventor Shinzo Kato 2-16 Tadachi, Machida, Tokyo No. 4 Inside the Liquefied Petroleum Gas Laboratory, High Pressure Gas Safety Association (72) Inventor Mitsuo Namba 2-16-4 Tadao, Machida-shi, Tokyo Inside the Liquefied Petroleum Gas Laboratory (72) Inventor Reihei Uematsu Tokyo 2-16-4 Tadao Machida City, High Pressure Gas Safety Association, Liquefied Petroleum Gas Laboratory (56) Reference JP 63-176087 (JP, A) JP 1-203818 (JP, A)

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 setting unit that sets a gas proper use condition as an initial value in advance, a proper use condition determination unit that outputs an interruption signal by determining that the signal of the use state detection unit is abnormal when the gas proper use condition deviates, A usage state storage unit that stores a history of gas usage states obtained from the usage state detection unit, an appropriate usage condition change unit that derives and changes the appropriate usage conditions based on a gas usage pattern obtained from the usage state storage unit, and the usage When the gas is in the unused state by the state detection unit, the duration time during the unused state is counted, and when the predetermined time or more has passed, Degrees using the default values unused state confirmation unit to re-change the conditions, the proper use gas cutoff apparatus provided with a blocking means for blocking the gas passage in accordance with the interruption signal from the state determining unit.