JP5158945B2 - Gas shut-off device - Google Patents

Description

  The present invention relates to a CO alarm device and a gas shut-off device, and more particularly to a gas shut-off device that specifies a carbon monoxide gas leaking instrument based on an output signal from the CO alarm device and ensures safety.

  Conventionally, this type of gas shut-off device has a configuration shown in FIG. 4 as disclosed in, for example, Japanese Patent Application Laid-Open No. 11-306463 (see Patent Document 1).

  The gas cutoff device of Patent Document 1 will be briefly described with reference to FIG. Reference numeral 1 is an alarm device, and 2 is a microcomputer gas meter, which are connected via signal lines. The microcomputer meter 2 is connected to the NCU 3 and is connected to a monitoring center (not shown) via the telephone line 4.

  The alarm device 1 has a methane gas sensor 4 for detecting methane. A CO sensor 5 is a gas sensor that detects CO. A CPU 6 detects signals from the methane gas sensor 4 and the CO sensor 5 when detection gas is generated. Sensor information is detected as a continuous gas concentration value. Reference numeral 7 denotes an audio LSI. When a gas leak situation is detected via the speaker 8, the voice LSI notifies the surroundings by voice. Reference numeral 9 denotes an LED, which displays when a gas leak condition is detected and notifies the surroundings. Reference numeral 10 denotes a power supply circuit. When power is first applied to the alarm device 1, the above-described functions start to operate.

  Next, the operation of the configuration of the conventional example will be described. This type of alarm 1 is often placed in a home cooking place. In general, city gas sometimes detects methane gas, which is a combustible gas, and also detects CO gas generated during incomplete combustion. The methane gas sensor 4 and the CO sensor 5 use the combustibility, and the combustible gas to be detected is burned in the vicinity of the high-temperature coil, so that the sensor temperature rises and is detected by a resistance value change or the like. When the gas is detected, it is output from the methane gas sensor 4 and the CO sensor 5 to the CPU 6 to detect a gas leak. When the alarm device 1 detects the occurrence of a gas leakage situation, it notifies a surrounding person by display or sound through the speaker 8 or the LED 9 through the sound LSI 7.

When the alarm device 1 detects gas, information is sent to the microcomputer meter 2 via the signal line, and further, the microcomputer meter 2 notifies the monitoring center via the NCU 3 and the telephone line 4. As described in various documents, when the alarm device 1 detects a gas leak and the microcomputer meter 2 sends it, the microcomputer meter 2 stops the gas supply and blocks the gas passage. When the gas concentration increases, the alarm device 1 performs alarm alarm transmission. When the gas concentration further increases, transmission is performed according to the gas concentration increase and decrease at regular intervals such as 1.5 times, 2 times, 2.5 times, and 3 times.
JP-A-11-306463

  However, in the conventional configuration described above, the gas appliance in use falls into an incomplete combustion state for some reason, the alarm device detects carbon monoxide gas (hereinafter referred to as CO) at an early stage, and the microcomputer meter uses a normal appliance. The flow rate of the state is not able to identify the carbon monoxide generating instrument, and if the microcomputer meter stops using the gas supply, if you use multiple instruments, you do not know which instrument was emitting carbon monoxide gas, As a result, the repair and repair of the equipment is delayed, especially when a stove or a bath water heater is used in a sealed room, the carbon monoxide gas is colorless and odorless, and the life of the user is long and dangerous. There are cases where it is placed, and there will be problems in terms of safety.

  The present invention solves the above-mentioned problems, identifies a carbon monoxide generating device from carbon monoxide gas having a lower concentration than an alarm device, enables early repair of the device, and is highly reliable and safe. A high gas shut-off device is provided.

In order to solve the above-described conventional problems, a gas shutoff device according to the present invention includes a CO alarm device that monitors whether carbon monoxide gas is generated, a flow rate detection unit that measures a gas flow rate, and a detection value of the flow rate detection unit. mean more and a flow rate calculating means for calculating a flow rate value, a flow rate storage unit flow rate is stored as a flow rate pattern in the case of more than a predetermined flow rate which has been determined by the flow rate calculating means, the instantaneous flow rate value determined from the flow rate computing means an average flow rate computing means for obtaining an average flow rate value turned into, if the average flow rate obtained by the average flow computing unit has changed more than a predetermined flow rate, a flow rate registration unit for flow registering an increase flow amount as the instrument flow, the CO and CO gas leakage determination unit for inputting an output signal corresponding to the concentration levels of carbon monoxide gas from the alarm, carbon monoxide gas occurrence signal from the CO gas leakage determination unit by the CO gas leakage determination unit If it detects a device flow storage unit for storing the registration flow rate are flow registered in the storage and flow rate pattern group of the flow rate storage unit the flow registration unit, registration flow is the flow rate registered in the flow registration unit Compare the flow rate pattern group stored in the flow rate storage means with the flow rate pattern stored in the appliance flow rate storage means and the registered flow rate to estimate the CO gas leakage device, and shorten the use time limit time if estimated as a CO gas leakage device An appliance estimation means for setting, an abnormality determination means for monitoring the abnormal state of the appliance in use by a registered flow rate from the flow rate registration means, the use time limit time, and a signal from the CO gas leakage determination means, and determining whether there is an abnormality, and When the abnormality determination of the abnormality determination means is established, a cutoff means for cutting off the gas supply, and a CO leakage appliance specified by the appliance estimation means, the appliance information is obtained. And a communication means for distribution.

  According to the above invention, when the use of the instrument is started, the instantaneous flow rate is obtained by the flow rate calculation means and sequentially stored in the flow rate storage means, while the average flow rate is obtained by the average flow rate calculation means, and the flow rate is registered as the flow rate for the appliance monitoring. Registered in the means, and the abnormality judgment means monitors the flow rate, length of use time, etc., but during monitoring, the CO alarm detects CO (carbon monoxide) gas generation and the CO gas leakage judgment means is low. When it is determined as a concentration state alarm signal, the flow rate pattern of the flow rate storage means and the registered flow rate of the flow rate registration means are input as a data group to the equipment estimation means as a device that may leak CO gas and the registered flow rate is registered in the abnormality determination means. Although the usage time is monitored in the corresponding flow rate category, if the flow rate pattern group that is estimated to be a CO gas leakage target device enters the device estimation means, the remaining time of the usage time is changed to a shorter time and monitored again. The equipment information such as the equipment number, which is classified and stored, is reported to the monitoring center, and if it is used without any CO gas leakage countermeasures being used thereafter, the equipment estimation means checks it against the previous flow rate pattern group for a predetermined correlation. When the flow rate is registered in the flow rate registration means, the abnormal judgment means restricts the usage time to a short usage time, thereby limiting the usage time from the very small alarm signal stage. Because the time is limited, the CO gas leakage is extremely small and shut off in a short time, so the danger to the user is extremely low, and the gas company is abnormal because it alerts the device information etc. It is possible to identify the device early and take action.

  The gas shutoff device of the present invention converts the instantaneous flow rate by the flow rate calculation means when the use of the instrument is started, and sequentially classifies the instantaneous flow rate as an instrument flow rate pattern in the flow rate storage means and stores it with an instrument number or the like. On the other hand, the average flow rate is calculated by the average flow rate calculation means for monitoring the total flow rate cutoff, the increased flow rate cutoff or the usage time cutoff, and monitored by the abnormality determination means. During monitoring, the CO alarm detects the CO gas leak, the CO gas leak determination means determines that the alarm signal is in a low concentration state, and outputs the alarm signal to the instrument estimation means. The instrument estimation means may cause a CO gas leak The flow pattern of the flow rate storage means and the registered flow rate of the flow rate registration means are stored in the device flow rate storage means as a device flow rate data group, and the flow rate pattern of the device flow rate storage means is reused. When the equipment flow rate is estimated by the group, and the CO gas leakage equipment estimation signal is input from the equipment estimation means in the abnormality judgment means, the usage time is not the usage time in the corresponding flow rate category of the registered flow, and the monitoring time is significantly shortened in preference. By setting the limit and monitoring the usage, the monitoring center is notified together with the information such as the equipment number, and the previous flow rate pattern group is used by the equipment estimation means even if some measures to deal with gas leaks are delayed and used by the customer. If the leak rate is within the specified correlation coefficient with the specified flow rate pattern, the usage time is limited from the very small warning signal stage and the usage time is limited every time it is used. Since the CO gas leakage is extremely small and shut off in a short time, the danger to the user is extremely low, and a warning is reported to the gas company as soon as possible. It can be, there is a high safety effect.

  A first invention for achieving the above object is to calculate a flow rate value from a CO alarm device for monitoring the presence or absence of carbon monoxide gas generation, a flow rate detection means for measuring a gas flow rate, and a detection value of the flow rate detection means. A flow rate calculating means, a flow rate storing means for storing the flow rate obtained by the flow rate calculating means and classifying and storing the flow rate, and an average for obtaining an average flow rate value by averaging instantaneous flow rate values obtained from the flow rate calculating means A flow rate calculation means, a flow rate registration means for registering a flow rate at the time of determination as an instrument flow rate from the average flow rate obtained by the average flow rate calculation means, and an output signal corresponding to the concentration level of carbon monoxide gas generation from the CO alarm CO gas leakage determination means, and when the flow signal is registered by the output signal of the CO gas leakage determination means and the flow rate registration means, the flow rate pattern group and the registered flow rate stored in the flow rate storage means are stored. An instrument estimation means for estimating a gas leakage instrument, and an output signal of the CO gas leakage determination means when the instrument estimation means determines the CO gas leakage instrument, and a memory of the flow rate storage means when the flow rate registration means registers the flow rate An appliance flow rate storage means for storing the flow rate pattern group, an abnormality determination means for monitoring the abnormal state of the appliance in use by a registered flow rate from the flow rate registration means and a signal from the CO gas leakage determination means, and determining whether there is an abnormality, When the alarm signal corresponding to the concentration from the CO alarm device is received, the usage time adjusting means for changing the usage time limit time corresponding to the registered flow rate and outputting it to the abnormality judgment means for monitoring, and the abnormality judgment of the abnormality judgment means When established, it comprises a shut-off means for shutting off the gas supply, and a communication means for reporting instrument information when a CO leakage instrument is specified by the instrument estimation means.

  And when the instrument is started to use, the instantaneous flow rate is obtained by the flow rate calculation means, sequentially stored in the flow rate storage means, while the average flow rate is obtained by the average flow rate calculation means, and the flow rate for the instrument monitoring is registered in the flow rate registration means, The abnormality judgment means monitors the flow rate value, length of use time, etc., but during monitoring, the instrument becomes incompletely combusted for some reason, the CO alarm detects the CO gas leak, and the CO gas leak judgment means is in the low concentration state. When it is determined as an alarm signal, the flow rate pattern of the flow rate storage means or the registered flow rate of the flow rate registration means as a device that may leak CO gas, and the past flow rate stored in the appliance flow rate storage means in the device estimation means from the data group Estimate whether the flow pattern of CO gas is leaking constantly from the pattern and registered flow rate, and store it in the device flow rate storage means. However, if the flow rate group that is estimated to be a CO leakage target instrument enters the instrument estimation means, the monitored usage time will be shortened and the remaining time will be shortened and monitored again. When notifying the monitoring center and then using it without taking any CO gas leakage countermeasures, the device estimation means checks it against the previous flow rate pattern group and, for example, if it falls within a predetermined correlation coefficient, it registers the flow rate. When the flow rate is registered in the means, the abnormality determination means limits the use time from the stage of the extremely small amount of CO gas alarm signal by limiting to a short use time, and the use time is limited every time it is used. Since CO gas leakage is extremely small and shuts off in a short time, the danger to the user is extremely low, and the gas company identifies abnormal equipment by notifying the equipment information with a warning. Easy it is possible early correspondence.

  Furthermore, a second invention for achieving the above object is a CO alarm device for monitoring the presence or absence of carbon monoxide gas generation, a flow rate detection means for measuring a gas flow rate, and a flow rate value from a detection value of the flow rate detection means. A flow rate calculating means for calculating; a flow rate storing means for storing the flow rate obtained by the flow rate calculating means; an average flow rate calculating means for averaging the instantaneous flow rate values obtained from the flow rate calculating means to obtain an average flow value; and the average A flow rate registration means for registering a flow rate at the time of determination as an appliance flow rate from an average flow rate obtained by a flow rate calculation means; a CO gas leakage determination means for inputting an output signal according to a concentration level of carbon monoxide gas generation from the CO alarm device; When the output signal of the CO gas leakage determination unit and the flow rate registration by the flow rate registration unit are registered, the flow rate pattern group stored by the flow rate storage unit and the registered flow rate are stored to estimate and use the CO gas leakage device. Instrument estimation means for outputting a signal for shortening the time limit setting time, occurrence frequency measurement means for measuring the occurrence frequency of the flow rate data group estimated by the instrument estimation means and performing a specific output with the CO gas leakage instrument, and An appliance flow rate storage means for storing an output signal of the CO gas leakage determination means when the appliance estimation means determines a CO gas leakage appliance and a flow rate pattern group stored in the flow rate storage means when the flow rate registration means is registered. The abnormality determination means for monitoring the abnormal state of the appliance in use by the registered flow rate from the flow rate registration means and the signal from the CO gas leakage determination means, and for determining whether there is an abnormality, and when the abnormality determination of the abnormality determination means is established And a communication means for reporting appliance information when the CO leakage appliance is specified by the appliance estimation means.

  And when the instrument is started to use, the instantaneous flow rate is obtained by the flow rate calculation means, sequentially stored in the flow rate storage means, while the average flow rate is obtained by the average flow rate calculation means, and the flow rate for the instrument monitoring is registered in the flow rate registration means, The abnormality judgment means monitors the flow rate value, length of use time, etc., but during monitoring, the instrument becomes incompletely combusted for some reason, the CO alarm detects the CO gas leak, and the CO gas leak judgment means is in the low concentration state. When it is determined as a CO alarm signal, the flow rate pattern of the flow rate storage means and the registered flow rate of the flow rate registration means as the appliances that may leak CO gas from the data group are past data stored in the appliance flow rate storage means in the appliance estimation means. It is estimated from the flow rate pattern and the registered flow rate whether the device has a flow rate pattern in which CO gas leaks constantly, and the occurrence frequency measurement means determines the flow rate pattern determined as CO gas leak by the equipment estimation means. The frequency of coincidence between the gas flow rate and the registered flow rate device and the CO gas leak is measured, and if it exceeds the predetermined number of times, the abnormality determination unit monitors the usage time in the corresponding flow rate category even if there is no signal from the CO gas leak determination unit. However, if the usage time is shortened and the remaining time is changed to monitor again, the monitoring center is notified, and if any CO gas leakage countermeasures are not taken afterwards, the appliance estimation means will use the previous flow rate. When the flow rate is registered in the flow rate registration means when collated with the pattern group and within the predetermined correlation coefficient, the abnormality determination means limits the use time to a short time and uses it from the stage of an extremely small amount of CO alarm signal. Because the time is limited and the usage time is limited every time it is used, the CO gas leakage is extremely small and shut off in a short time, so there is a great danger to the user. Ku, gas companies by warning Problem with instrument information is capable of quick response easier to identify an abnormal instrument.

  And since it is a program, a part or all of the interruption | blocking apparatus of this invention can be easily implement | achieved using a microcomputer etc. Also, program distribution and installation can be simplified by recording on a recording medium or distributing a program using a communication line.

(Embodiment 1)
FIG. 1 is a diagram showing an installation mode of a gas cutoff device and a gas appliance in Embodiment 1 of the present invention, and FIG. 2 is a control block diagram of the gas cutoff device.

  A gas shut-off device 12 is installed at the entrance of the gas supply pipe 11 in each household, and branches to the place where various gas appliances used at home are branched from the gas pipe 13 after passing through the gas shut-off device 12. Piped and supplied with gas. For example, a gas water heater 14 is installed outdoors, and hot water generated by the gas water heater 14 is installed in a kitchen hot water tap 15, a bath 16 in which a bathtub and a shower device are installed, a living room and the like through a water pipe. The floor heating 17 is supplied to form various usage forms. In addition, when indoors, gas is supplied to the gas table 18 installed in the kitchen and the gas fan heater 19 installed in the living room, bedroom, etc., but the CO alarm 20 is installed in the kitchen, living room, bedroom, etc. CO (carbon monoxide, abbreviated as CO) gas leakage is monitored.

  When the installed gas appliance is used and gas consumption occurs, the gas shut-off device 12 measures the amount of use, and the data is accumulated and stored every predetermined period. The data stored in the gas shut-off device 12 is subjected to predetermined information processing based on a periodic data request command from the gas company, and then the gas fee, gas usage amount, discount service provided by the gas company, etc. This information is sent to consumers and gas companies.

  FIG. 2 is a control block diagram of the CO alarm 20 connected to the gas shut-off device 12. As an example, the 20 CO alarm device includes a CO gas sensor 21 that detects CO gas and changes its signal level according to the CO concentration level, an amplifying means 22 that amplifies the signal, and a CPU 23 that processes the amplified signal. . The CO alarm 20 is connected through a terminal block of the gas shut-off device 12 or the like. The CO alarm device 20 outputs a code signal or an analog signal to the gas cutoff device 12 as the CO gas concentration level increases.

  As the gas shut-off device 12, 24 is a flow rate detecting means for measuring the gas flow rate. There are various methods as the flow rate detection means 24, and an ultrasonic signal is transmitted from one to the other by a pair of ultrasonic sensors installed in the flow path shown in the present embodiment, and the gas flow rate used is determined from the propagation time. For detecting the flow rate, or for determining the flow rate from the impedance that changes depending on the flow with a hot-wire sensor installed in the flow path, and for detecting the amount of gas with a metering membrane, Some devices detect the flow rate as an electrical pulse signal.

  For example, in the case of the flow rate detection means 24 using an ultrasonic sensor, although not shown, a first transmitter / receiver for transmitting or receiving ultrasonic waves and a second transmitter / receiver for receiving or transmitting ultrasonic waves are arranged in opposition to the flow direction, An ultrasonic signal is transmitted from the upstream to the downstream and from the downstream to the upstream at predetermined intervals, and the propagation time is measured. Then, an instantaneous flow rate value is obtained by 25 flow rate calculation means in consideration of the cross-sectional area of the flow path and the flow state of the fluid from the propagation time difference of the ultrasonic waves between the first transceiver and the second transceiver.

  Reference numeral 26 denotes a flow rate storage means for storing a detected instantaneous flow rate that is equal to or higher than a predetermined flow rate and is equal to or higher than a flow rate that is determined as an instrument flow rate. The data is stored as a flow rate pattern group, and is classified into a large flow rate region, a medium flow rate region, and a small flow rate region, and stored with serial instrument numbers. Reference numeral 27 denotes an average flow rate calculation means for inputting instantaneous flow rate values obtained in a predetermined cycle, and a predetermined number of instantaneous flow rate values are collected and averaged to be calculated as an average flow rate value. Reference numeral 28 denotes a flow rate registration means, which is registered as a usage time monitoring target as an instrument flow rate when the obtained average flow rate value is equal to or greater than a predetermined flow rate. Usually, when the flow rate change width is greater than or equal to a predetermined flow rate with respect to the flow rate value of the previous time or N times before, the increased flow rate is registered as the instrument flow rate. If it decreases, it is determined that the instrument is stopped and the registered flow rate is deleted or changed.

  Reference numeral 29 denotes a CO gas leakage determination means, which outputs a signal corresponding to the CO gas concentration level in the room from the CO alarm device 20, and determines which concentration level the leakage signal is. The CO gas leakage determination means 28 receives and processes an analog signal, receives it as a communication signal, and receives it as a digital signal in which the concentration level is encoded. 30 is an appliance estimation means, and past appliance flow pattern groups and flow registration values stored in the appliance flow storage means 31 from the flow rate pattern group stored in the flow storage means 26 and the signal of the CO gas leakage determination means 29. Based on the above, it is estimated whether there is an instrument flow pattern that may cause gas leakage. When there is only one flow rate registration in the flow rate registration unit 28, the flow rate pattern device in the flow rate storage unit 26 is estimated as a CO gas leakage device and registered therein. When multiple flow rates are registered, the flow rate value change over the predetermined flow rate, the peak flow rate, and the flow rate change after the peak flow rate are determined based on whether the closeness of the flow rate is within a predetermined range using, for example, a correlation coefficient or covariance. . The appliance flow rate storage means 31 stores information such as a flow rate pattern group of the flow rate storage means 26 and a flow rate registration value of the flow rate registration means 28 every time a signal is output from the CO gas leakage determination means 29 in sequence.

  Reference numeral 32 denotes an abnormality determination unit that monitors the appliance used. The monitoring value setting means 33 stores the appliance continuous use time limit corresponding to the flow rate range from the registered flow rate of the flow rate registration means 28, or the monitoring judgment value of the maximum use flow rate. For example, when the hose that supplies gas to a stove or the like is disconnected for some reason, an abnormally large flow rate is generated, but the total flow cutoff value for monitoring such a condition and the maximum use time of the appliance normally A usage time cutoff time limit that defines a usage time limit time is set corresponding to the case where it is used for a much longer time, and this set value and the registered flow rate value of the flow rate registration means 27 are compared and determined by the abnormality determination means 32. Thus, it is determined whether the registered flow rate value does not exceed the maximum use flow rate value, or whether the appliance use time exceeds the appliance continuous use limit time corresponding to the registered flow rate value. When a CO leakage appliance determination signal is output from the appliance estimation means 30 to the abnormality determination means 32, a much shorter use time limit time is set in preference to the original time limit of the monitor setting means 33. When the alarm signal having the highest CO concentration level is output from the CO gas leakage determination means 28, the alarm signal is output to the abnormality determination means 32, and the interruption means 34 is immediately activated to shut it off.

  When the abnormality determination means 32 determines that there is an abnormality, a cutoff signal is sent to the cutoff means 34 to stop the gas supply. In addition, the shut-off state and the shut-off content are displayed on the liquid crystal display element and the like, and the center that performs gas safety monitoring is notified through the communication means 35.

  If the appliance estimation means 30 estimates that the CO gas leaks, the abnormality determination means 32 monitors the usage time of the registered flow rate, but adjusts the usage time significantly. When the appliance flow rate is registered in the flow rate registration means 27 and the usage time is monitored by the abnormality determination means 29, when the CO gas leakage leakage appliance is estimated by the appliance estimation means 30, the usage time is adjusted. Whenever the usage time is adjusted, a call notification with the usage time limit changed is sent to the monitoring center (not shown) of the gas company through the communication means 35. The flow rate range codes of the large flow rate range, medium flow rate range, and small flow rate range and instrument numbers belonging to each flow rate range belonging to this time are communicated to the center through the communication means 35.

  Next, the operation of the gas cutoff device of the present invention will be described. When a gas appliance, such as a gas stove 19 or a water heater 14, held at a customer's home is used, the flow rate is detected by the flow rate detection means 24. For example, when an ultrasonic sensor is used, the propagation time of the ultrasonic signal is measured as a detection value, and this signal is sent to the flow rate calculation means 25 and calculated as an instantaneous flow rate value. When the value is detected, it is determined that the flow rate is an instrument flow rate, and a time-series flow rate value is stored as a flow rate pattern. Based on the instantaneous flow rate value of the flow rate pattern detected at the same time, the flow rate code is classified into a large flow rate region, a medium flow rate region, and a small flow rate region and the flow rate region, and an instrument number is assigned and stored. The average flow rate calculation means 27 calculates the average flow rate from the flow rate of each predetermined number, and the obtained average flow rate is compared with the average flow rate before N times (n = 1) before the flow rate changes more than the predetermined flow rate. The increased flow rate is registered in the flow rate registration means 28 by determining that the appliance is being used.

  Then, the abnormality determination unit 32 measures and monitors the usage time of the used appliance with reference to the monitoring value stored in the monitoring value storage unit 33 from the flow rate classification to which the registered flow rate belongs, that is, the time limit value of the usage time. On the other hand, it is also monitored in parallel whether the flow rate value obtained by the average flow rate calculation means 26 before being registered in the flow rate registration means 27 does not exceed the abnormal flow rate due to a cause such as hose disconnection.

  When the gas table 18, the gas fan heater 19 or the like is used in a living room or kitchen, if a carbon monoxide (abbreviated as CO) gas leakage occurs due to an incomplete combustion state for some reason, the CO gas sensor 21 of the CO alarm 20 Is detected, and a CO gas leak signal is output from the CPU 23 to the gas shut-off device 12 as a first-stage alarm signal, for example, as an alarm signal at a very low CO gas concentration level. When the CO gas leakage determining means 29 detects the first stage signal, the appliance estimating means 30 is a flow rate registered value, a flow rate pattern group stored in the flow rate storage means 26, a flow rate data group in the appliance flow rate storage means 31, and a flow rate pattern. The group and the registered flow rate are compared, and the correlation is examined by dividing into blocks of each flow rate pattern. Judgment is made based on the rise of the flow rate, the peak flow rate, the flow rate value in a stable state, the change flow rate gradient when the flow rate changes, and the like, and it is estimated whether the device flow rate is when the CO gas leak signal is detected.

  When a CO gas leak signal is first detected, the flow rate pattern group and the registered flow rate are stored in the instrument flow rate storage means 31, and for safety, a signal is output to the abnormality determination means 32 as CO gas leak instrument detection to measure the usage time. And reduce the monitoring time. For example, while the gas table 18 and the gas fan heater 19 are being used, the time monitored from 720 minutes at the beginning is shortened to, for example, 20 minutes. And it classify | categorizes for every high flow area memorize | stored in the flow volume memory | storage means 26, the middle flow area, and the small flow area, and stores an instrument number collectively. When the CO gas leakage determination means 29 inputs the maximum n-th stage alarm signal having a higher CO concentration than the CO alarm device while it is used, the estimated output that the CO leakage apparatus is in use is output to the abnormality determination means by the apparatus estimation means 30. When output, the abnormality determination unit 32 immediately outputs a blocking signal to the blocking unit 34.

  When the instrument is stopped and reused, and the CO gas leak determination means 29 detects the CO gas leak signal, the instrument estimation means 30 determines whether the instrument is a CO gas leak instrument based on the data in the instrument flow rate storage means 31 and the correlation coefficient, for example. And a CO gas leakage appliance detection signal is output to the abnormality determination means 32 to greatly limit the usage time. When a CO leakage appliance determination signal is output from the appliance estimation means 30 to the abnormality determination means 32, a much shorter use time limit time is set in preference to the original time limit of the monitor setting means 33. At the same time, a call communication with a limited use time by CO gas leakage detection is performed to the center of the gas company via the communication means 31. A normal call is a code signal indicating an abnormal content and a flow rate classification. In the case of CO leakage, a CO leakage code indicating a CO leakage state and an instrument code CO alarm content (concentration levels such as the first and second stages) Send encoding) and time limit. Usually, the alarm signal of the density level in the first stage is an extremely low level signal that does not affect the human body.

  When the CO gas concentration detected by the CO alarm 20 gradually increases, the second and third alarms are changed and sent. When the signal is detected, the judgment range of the correlation coefficient of the instrument flow rate pattern in the instrument estimation means 32 is widened, the estimation of the gas leak instrument is facilitated, the monitoring value of the usage time is further shortened, and the remaining time is gradually shortened. . At the same time, call communication is made to the center. Further, when the gas concentration level is rapidly increased and the CO gas leakage determination means 29 receives an extremely dangerous alarm signal having the maximum concentration, it outputs to the abnormality determination means 32 and immediately outputs a cutoff signal to the cutoff means 33 to supply gas. To ensure safety.

  It should be noted that the numerical limitation used in the present embodiment is an example, and the usage pattern is not limited to this embodiment.

  As described above, when the CO gas leak is detected by the CO alarm device 20 and the first gas warning signal having a low CO gas concentration level is detected by the CO gas leak determination means 29 on the gas cutoff device 12 side, the instrument estimation is performed. From the instrument flow rate registered in the means 30, the time series signal of the flow rate stored in the flow rate storage means 26 above the predetermined flow rate, and the data stored in the instrument flow rate storage means 31, it is estimated whether or not it is a CO gas leaking instrument. When it is estimated that the gas leaks, it limits the usage time monitored and monitored by the abnormality determination means 32, and notifies the center of the appliance number that is classified and stored by the communication means. It is possible to notify the gas appliance customers, and to prevent the danger to life such as carbon monoxide poisoning due to CO gas leakage, and to the gas company center, etc. Help identify instruments by Problem distribution, early safety gas operators with low CO gas concentration level stage, or can be taken to the gas consumer, extremely safe, and reliable.

(Embodiment 2)
FIG. 3 is a control block diagram of the gas cutoff device according to Embodiment 2 of the present invention. In FIG. 3, the same number is attached to the means for performing the same function as in FIGS. 1, 2, 4 and 5.

  In FIG. 3, gas is supplied to the gas table 18 installed in the kitchen and the gas fan heater 19 installed in the living room or bedroom in each household, and the CO alarm is used for monitoring the CO gas leak in the kitchen, living room or bedroom. A vessel 20 is installed.

  Reference numeral 36 denotes an occurrence frequency measuring means. When the CO gas leakage determination means 29 detects a CO gas leak signal from the CO alarm device 20, the appliance estimating means 30 stores the flow rate pattern stored in the flow rate storage means 26 and the flow rate registration means 28. As a group of flow rate data, it is counted that there is a gas leak frequency from the registered flow rate, and after reaching the predetermined number of times, the gas leak is determined only by determining the flow pattern even if there is no gas leak signal from the CO gas leak determination means 29 A use time shortening setting signal is output to the abnormality determination means 32 by estimating that the appliance is to be used.

  Next, the operation of the gas shut-off device configured as described above will be described. When a gas appliance, such as a gas stove 19 or a water heater 14, held at a customer's home is used, the flow rate is detected by the flow rate detection means 24. For example, when an ultrasonic sensor is used, the propagation time of the ultrasonic signal is measured as a detection value, and this signal is sent to the flow rate calculation means 25 and calculated as an instantaneous flow rate value. When the value is detected, the flow rate is determined to be an instrument flow rate, and the time-series flow rate value is stored as a flow rate pattern. The average flow rate calculation means 27 calculates the average flow rate from the flow rate of every predetermined number, and the obtained average flow rate is compared with the average flow rate N times before, and if there is a flow rate change more than the predetermined flow rate, it is determined that some device is used. The increased flow rate is registered in the flow rate registration means 28.

  Then, the abnormality determination unit 32 measures and monitors the usage time of the used appliance with reference to the monitoring value stored in the monitoring value storage unit 33 from the flow rate classification to which the registered flow rate belongs, that is, the time limit value of the usage time. On the other hand, it is also monitored in parallel whether the flow rate value obtained by the average flow rate calculation means 26 before being registered in the flow rate registration means 27 does not exceed the abnormal flow rate due to a cause such as hose disconnection.

  When the gas table 18 or the gas fan heater 19 is used in a living room or kitchen, if the CO gas leaks due to incomplete combustion due to some cause, the CO gas sensor 21 of the CO alarm device 20 detects the CO gas leak. As an alarm signal at an extremely low gas concentration level, for example, a CO gas leakage signal is output from the CPU 23 to the gas shut-off device 12 as a first-stage alarm signal. When the CO gas leakage determining means 29 detects the first stage signal, the instrument estimating means 30 is a flow rate registered value, a flow rate pattern group stored in the flow rate storage means 26, a flow rate data group in the instrument flow rate storage means 31, and a flow rate pattern. The group and the registered flow rate are compared, and the correlation is examined by dividing into blocks of each flow rate pattern. Judgment is made based on the rise of the flow rate, the peak flow rate, the flow rate value in a stable state, the change flow rate gradient when the flow rate changes, and the like, and it is estimated whether the device flow rate is when the gas leak signal is detected. Every time a device is used and a CO gas leak is detected, the occurrence frequency measuring means 36 measures the number of occurrences of CO gas leaks as the occurrence frequency of the flow rate pattern device estimated by the device estimating means 30 as a CO gas leak device.

  When a gas leak signal is first detected, the flow rate pattern group and the registered flow rate are stored in the instrument flow rate storage means 31, and for safety, a signal is output to the abnormality determination means 32 as gas leak instrument detection, and the usage time is measured and monitored. To reduce the time spent. For example, while the gas table 18 and the gas fan heater 19 are being used, the time initially monitored from 720 minutes is set to 60 minutes, for example, and the remaining time is shortened.

  When the instrument is stopped and reused, and the gas leak signal is detected by the CO gas leak determination means 29, the instrument estimation means 30 estimates whether the instrument is a gas leak instrument based on the data in the instrument flow rate storage means 31 and the correlation coefficient, for example. Every time, the occurrence frequency measuring means 35 measures the number of times. When the number of occurrences exceeds a predetermined number, even if there is no gas leak signal from the gas leak determination means 29, a gas leak appliance detection signal is output to the abnormality determination means 32 to greatly limit the use time. At the same time, the communication information 31 is sent to the center of the gas company, along with the call communication corresponding to the use time limit based on the gas leakage detection, and the device information such as the device number in which an abnormality has occurred. When the CO alarm 20 is activated, although not shown, a warning is given to the gas customer by voice notification or the like. However, if the CO alarm is repeated, the CO alarm may be unplugged, resulting in leakage from the gas appliance. However, it can be estimated from the gas flow rate data as the flow pattern of the gas leakage device, and the usage time of the device can be greatly limited. Further, the alarm signal of the concentration level in the first stage is a very low level signal that does not affect the human body, and is an initial stage, and safety can be ensured by limiting the use time.

  It should be noted that the numerical limitation used in the present embodiment is an example, and the usage pattern is not limited to this embodiment.

  As described above, when the CO alarm device 20 detects a gas leak and the CO gas leak determination means 29 on the gas shut-off device 12 side detects the first-stage alarm signal having a low gas concentration level, the appliance estimation means 30. Is estimated from the flow rate time series signal stored in the flow rate storage means 26 and the flow rate time series signal stored in the flow rate storage means 26 and the data stored in the appliance flow rate storage means 31, and the number of occurrences is estimated. The occurrence frequency measuring means 35 counts, and when the predetermined number of times is reached, even if there is no alarm signal from the CO gas leakage determining means 29, the signal from the instrument estimating means 30 is estimated to be a gas leaking instrument, and the abnormality determining means 32 monitors the time. By limiting the usage time, the safety of gas appliance customers is ensured, the risk of fire and life due to gas leaks is prevented, and the appliance is judged abnormal by the appliance estimation means 30 By reporting the equipment information such as the number to the gas company's center, it is easy to identify the CO generating equipment and allow gas companies or gas customers to take safety measures at an early stage when the gas concentration level is low. It is extremely safe and reliable.

  As described above, the gas shut-off device according to the present invention can appropriately secure the use restriction function of the gas flow device that identifies and monitors the gas leakage device when gas leakage is detected, and is applicable to the device monitoring device in general. It can be done.

The figure which shows the installation form of the gas appliance Control block diagram of gas shutoff device in embodiment 1 of the present invention Control block diagram of gas shut-off device in embodiment 2 of the present invention Control block diagram of a conventional gas shut-off device

Explanation of symbols

20 CO alarm device 24 Flow rate detection means 25 Flow rate calculation means 26 Flow rate storage means 27 Average flow rate calculation means 28 Flow rate registration means 29 CO gas leakage determination means 30 Instrument estimation means 31 Instrument flow rate storage means 32 Abnormality determination means 34 Shutoff means 36 Shut off means 36 CO generation Frequency measurement means

Claims (3)

A CO alarm for monitoring the presence or absence of carbon monoxide gas;
A flow rate detecting means for measuring a gas flow rate;
A flow rate calculation means for calculating a flow rate value from a detection value of the flow rate detection means;
A flow rate storage unit flow rate obtained by the flow rate computing means stores a flow pattern in the case of more than a predetermined flow rate,
Average flow rate calculation means for averaging the instantaneous flow rate values obtained from the flow rate calculation means to obtain an average flow rate value;
If the average flow rate obtained by the average flow computing unit has changed more than a predetermined flow rate, a flow rate registration unit for flow registering an increase flow amount as the instrument flow,
CO gas leakage determination means for inputting an output signal corresponding to the concentration level of carbon monoxide gas from the CO alarm device;
When the CO gas leakage determination means detects a carbon monoxide gas generation signal from the CO gas leakage determination means, the flow rate pattern group stored in the flow rate storage means and the registered flow rate registered in the flow rate registration means Instrument flow rate storage means for storing
Estimating a CO gas leakage appliance, compared with the registered flow rate that is the flow rate registration and flow rate pattern group stored in said flow rate storage unit, the flow rate pattern stored in the appliance flow rate storage unit and the registered flow rate and by the flow rate registration unit, an instrument estimating means for shortening setting the use time limit time After estimating the CO gas leakage appliance,
An abnormality determination unit that monitors the abnormal state of the appliance in use by a registered flow rate from the flow rate registration unit, the use time limit time, and a signal from the CO gas leakage determination unit, and determines whether there is an abnormality,
Shut-off means for shutting off the supply of gas when the abnormality judgment of the abnormality judgment means is established;
A gas shut-off device comprising communication means for reporting appliance information when a CO leakage appliance is specified by the appliance estimation means. A CO alarm for monitoring the presence or absence of carbon monoxide gas;
A flow rate detecting means for measuring a gas flow rate;
A flow rate calculation means for calculating a flow rate value from a detection value of the flow rate detection means;
A flow rate storage unit flow rate obtained by the flow rate computing means stores a flow pattern in the case of more than a predetermined flow rate,
Average flow rate calculation means for averaging the instantaneous flow rate values obtained from the flow rate calculation means to obtain an average flow rate value;
If the average flow rate obtained by the average flow computing unit has changed more than a predetermined flow rate, a flow rate registration unit for flow registering an increase flow amount as the instrument flow,
CO gas leakage determination means for inputting an output signal corresponding to the concentration level of carbon monoxide gas from the CO alarm device;
When the CO gas leakage determination means detects a carbon monoxide gas generation signal from the CO gas leakage determination means, the flow rate pattern group stored in the flow rate storage means and the registered flow rate registered in the flow rate registration means Instrument flow rate storage means for storing
Estimating a CO gas leakage appliance, compared with the registered flow rate that is the flow rate registration and flow rate pattern group stored in said flow rate storage unit, the flow rate pattern stored in the appliance flow rate storage unit and the registered flow rate and by the flow rate registration unit, an instrument estimating means for shortening setting the use time limit time After estimating the CO gas leakage appliance,
Counting the number of times that estimated to CO gas leakage appliance by the appliance estimation unit, when the number reaches a predetermined number of times, the occurrence frequency measuring unit to greatly limit the use time limit time,
An abnormality determination unit that monitors the abnormal state of the appliance in use by a registered flow rate from the flow rate registration unit, the use time limit time, and a signal from the CO gas leakage determination unit, and determines whether there is an abnormality,
Shut-off means for shutting off the supply of gas when the abnormality judgment of the abnormality judgment means is established;
A gas shut-off device comprising communication means for reporting appliance information when a CO leakage appliance is specified by the appliance estimation means. The program for functioning a computer as all the means of the gas cutoff device of any one of Claims 1-2.

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