JPH0749856B2 - Gas shutoff device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gas shutoff that automatically shuts off a gas supply path in the event of an abnormality and prevents the occurrence of explosion accidents, poisoning accidents, etc. due to city gas, propane gas, etc. It relates to the device.

2. Description of the Related Art Conventionally, as shown in FIG. 2, a conventional gas shutoff device of this type has a gas meter 2 in a gas supply line 1, a flow rate measuring means 3 for issuing a signal according to the amount of gas passing through the gas meter, and a gas meter. A shut-off means 4 for stopping the supply is provided, and the use state is judged by the flow rate signal of the flow rate measuring means 3, and when it deviates from the preset gas proper use condition stored, it is judged as abnormal and the shut-off means 4 is closed. It was equipped with a control unit 5 for emitting a signal. 6 is a gas appliance attached to the tip of the gas meter.

FIG. 3 shows a configuration example of the conventional control unit 5. Those having the same reference numerals as those in FIG. 2 are components having the same function. The control unit 5 inputs the flow rate signal from the flow rate measuring unit 3 described above, and a use state detection unit 7 that detects the use state of gas, and an initial condition that sets appropriate use conditions in advance according to the number of the gas meter. It comprises a setting unit 8 and a proper use condition judging unit 9 which judges that the signal of the use state detecting unit is abnormal when the signal deviates from the gas proper use condition and outputs a cutoff signal. 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. What is the total flow condition?
When the total gas flow rate passing through the gas meter within a predetermined measurement period exceeds a predetermined value that is initially set when the gas hose is pulled out or when the gas appliances burn out, the shutoff means is activated. The individual maximum flow rate condition is to detect how many kinds of gas appliances are currently used by detecting the change in gas flow rate for each predetermined measurement period, identify and estimate how much gas consumption is used for each, and determine the maximum value among them. When the gas consumption exceeds a predetermined set value, a closing signal is output to the shut-off means to cope with gas leakage such as cracking of the gas hose and burning out when the gas plug is half opened. In addition, the safe continuous use time condition refers to the continuous usable time set for each range from the statistical data of the time that the gas appliance in a certain combustion range is continuously used, and the data from the usage state detection unit is When the set time is exceeded, an operation signal is sent to the shutoff 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 proper use condition determination unit 9 performs the comparison determination with the initial value, so that the abnormality of the gas supply system is detected. Was detected to ensure safety.

Problems to be Solved by the Invention However, in the configuration as described above, 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. No special conditions were incorporated, and even when the gas usage was normal, it was judged as abnormal and the gas passage was blocked.

The present invention solves the above conventional problems, by actually measuring the flow rate pattern of the gas used in each home for a predetermined period, and resetting the judgment conditions that are strict but suit the actual conditions, It is intended to provide a safer gas shutoff device. Further, another object of the present invention is to provide a device with higher reliability by surely estimating the individual gas appliance during the measurement for the predetermined period of this 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 for generating a signal in accordance with the amount of gas passing through a gas meter provided in the gas supply line, a usage state detecting section for detecting a gas usage state by a 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 activating the timer, an input section for the number of appliances to be used, which can individually determine whether or not a plurality of gas appliances at the end of the gas supply line are used, and the timer is activated by a flow signal sent from the flow measuring means. Gas storage state for storing the gas usage state according to the contents of the number of used appliances input section, a gas for changing the appropriate gas usage conditions according to the contents of the storage section A configuration in which a blocking means for blocking the gas passage in response to the blocking signal of the control unit of a positive use condition changing section from the control unit.

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 usage pattern is measured by the operation of the usage status storage unit. That is, during this period, the actual measurement values such as the total flow rate, the individual maximum flow rate, and the continuous use time described above are updated. However, in the case of individual flow rate, it is updated only when the content of the number of used appliances input section is 1, or when the flow rate of one individual appliance can be accurately determined from the measured value of the flow rate and the content of the number of used tool input section. To do. Further, in the case of continuous use time, updating is performed only when the use time of one individual tool can be accurately determined from the tool use time of the use tool number input section and the measured value of the flow rate. Then, at the same time as the timer ends, the final data is compared and determined by the gas proper use condition changing unit with the initial value, and a predetermined gas proper use condition is newly set. 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. 3 are components having the same functions. 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 a proper use condition determination unit 9 that outputs a cutoff signal by determining that the signal from the use state detection unit 7 deviates from the proper use condition.
A timer 11 for counting a predetermined period, and the timer 11
A starting signal applying means 12 for activating, a number of used appliances input section 15 capable of individually discriminating whether or not a plurality of gas appliances at the tip of the gas supply line are used, and a timer 11 by a flow rate signal sent from the flow rate measuring means 3. A usage state storage unit 13 that stores the operating gas usage state according to the content of the number-of-use-apparatus input unit 15,
The gas proper use condition is changed according to the contents of the use state storage unit 13, and is composed of a gas proper use condition changing unit 14.

In the above configuration, when the activation signal applying means 12 (for example, a push button switch or the like) is activated, an activation signal is sent to the timer 11, and the timer 11 receives the signal and starts counting for a predetermined period. Simultaneously with the operation of the timer 11, the use state storage unit 13 stores the use pattern of gas, that is, the total flow rate, the individual maximum flow rate, and the continuous use time. As for the total flow rate, the maximum value of the total flow rate passing through the meter is compared with the previously stored flow rate and stored. If the actual value of the individual maximum flow rate is estimated based on only the increase / decrease in the total flow rate, the individual appliances will be treated as the flow rate of one appliance when the appliances start up at the same time. For that purpose, the rising of the number-of-uses input section 15 is checked, and only the flow rate at the time of rising of one instrument is compared with the previously stored flow rate and the maximum value is stored. Even if the actual value of the continuous use time is estimated only for the increase / decrease of the total flow rate for individual appliances, the continuous use time will be stored as short if the fluctuation of the flow rate is large for one appliance. Therefore, the minimum value is stored by actually measuring the rising and falling times of the number-of-uses input section 15 and comparing it with the previously stored time. In this way, when the count of the timer 11 is completed, the final data is sent from the use state storage unit 13 to the proper use condition changing unit 14. This change section
In 14, the initial condition is compared with the final data, and the smaller value is selected, that is, the new proper usage condition is set again on the safer side. That is, the timer 11
Until the end of counting, the proper use condition determination unit 9 determines the abnormal state by comparing the current gas use state with a preset initial value, but the gas use pattern during operation of the timer 11 After the condition is newly set based on the actual measurement result, the abnormal state is judged by comparing with the reset value. Here, when it is determined that there is an abnormality, the shutoff means 4 is activated and the gas passage is closed.

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, it is determined to be abnormal. In this case, since the shut-off means operates to stop the gas supply, it is possible to prevent a dangerous state such as gas explosion or gas poisoning.

(2) Since the actual use pattern of the gas supply system in which the gas meter is installed is observed for a predetermined period by the start signal, the measured value is compared with the initial value, and the predetermined value is reset as the proper use condition. Compared with the condition that is uniformly determined by the capacity of the gas meter, the special condition of each home is also added, so the safety level against gas accident can be further increased. Further, it was necessary to change the condition by some method depending on the capacity of the gas meter, but such a trouble is eliminated.

(3) Furthermore, when resetting, since the information on the use / non-use of individual appliances is accurate rather than estimated by the information in the number of used appliances input section, the highly reliable condition suitable for actual use is reset. The safety level can be further increased.

[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 block diagram of a conventional gas shutoff device, and FIG. 3 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 …… Appropriate use condition changing unit, 15 …… Input device number input unit, 16 …… Control unit.

Claims (1)

[Claims] 1. A flow rate measuring means provided in a gas supply passage for generating a signal according to the amount of gas passing through a gas meter, 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 gas proper use conditions as initial values 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 use proper condition deviates from the predetermined condition, a predetermined value A timer for counting a period, a start signal applying means for activating the timer, an input section for the number of appliances to be used, which can individually determine whether or not a plurality of gas appliances at the end of the gas supply path are used, and a flow rate signal sent from the flow rate measuring means. In the use state storage unit that stores the gas use state during the timer operation according to the content of the number-of-use-apparatus input unit, and the gas proper use provision according to the content of the use state storage unit. A gas shutoff device comprising: a control unit including a gas proper use condition changing unit to be changed; and a shutoff unit that shuts off a gas passage in response to a shutoff signal from the control unit.