JP5322260B2 - 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 gas from the alarm device 1 is detected, 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. a flow rate calculation means for calculating a more instantaneous flow rate value, when the flow rate determined by the flow rate calculation means is equal to or larger than a predetermined flow rate, a flow rate storage unit for storing a flow rate pattern group, and more determined instantaneous to the flow rate calculating means an average flow rate computing means for obtaining an average flow rate value the flow rate values are averaged, the average flow when the average flow rate obtained by the calculation means is changed more than a predetermined flow rate, the flow rate increases the flow amount and the instrument flow registered flow rate registration unit When the the abnormality determining means for monitoring the continuous use time limit or usage maximum flow rate depending on the flow rate range of the registered instrument flow by the flow rate registration unit, the concentration Les of carbon monoxide gas from the CO alarm If it detects carbon monoxide gas occurrence signal from the CO alarm by the CO gas leakage determination unit for inputting an output signal corresponding to Le, the CO gas leakage determination unit, the flow pattern stored in the flow storage unit Instrument flow storage means for storing a group and the instrument flow rate registered by the flow rate registration means, the instrument flow rate registered by the flow rate registration means, and the flow rate pattern stored by the flow rate storage means A CO gas leaking device is estimated by comparing the group, the flow rate pattern group stored in the device flow rate storage means and the device flow rate, and the CO gas leaking device is estimated to shorten the use time limit. an estimation unit, in parallel with the monitoring by the abnormality determining means, the flow rate the instrument flow from the registration unit, the use time limit time, the CO gas Mode to monitor the abnormal condition of the signal by using the instrument of the decision means, and CO anomaly determination unit determines the presence or absence of abnormality, when the abnormality determination is satisfied by the abnormality determining means or said CO anomaly determination unit, the gas supply comprising a blocking means for blocking, when specifying the CO leakage appliance by the appliance estimation unit, and a communication means for flagging device information.

  According to the above-described invention, when the use of the instrument is started, the instantaneous flow rate is obtained by the flow rate calculation means, and is sequentially stored in the flow rate storage means. And the abnormality determination 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 leak determination means has a low concentration. When it is determined as a 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 detected by the CO abnormality determination means. However, if the flow rate pattern group that is estimated to be a CO gas leakage target device is entered in the device estimation means, the remaining time of the monitored usage time is changed to a shorter time and monitored again. In addition, the device information such as the device number classified and stored is reported to the monitoring center, and if it is used without any CO gas leakage countermeasures being used thereafter, the device estimation means collates the previous flow rate pattern group with a predetermined phase. If the flow rate is registered in the flow rate registration means when it is within the relational number, the abnormality judgment means limits the usage time from the very small alarm signal stage by limiting the usage time to a short amount of time. Since the usage time is limited, the CO gas leakage is extremely small and is shut off in a short time, so the danger to the user is extremely low, and the gas company is alerted to the appliance information. Abnormal instruments can be identified early and actions can be taken.

  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 the registered maximum flow rate is monitored by the abnormality judgment unit. CO gas leakage is detected, the CO gas leakage determination means determines that the alarm signal is in a low concentration state and outputs it to the appliance estimation means, and the appliance estimation means assumes that a device that is likely to leak CO gas is used. The flow rate pattern and the registered flow rate of the flow rate registration means are stored in the appliance flow rate storage means as an appliance flow rate data group, and the appliance flow rate is estimated with the flow rate pattern group of the appliance flow rate storage means even if it is reused. In parallel with the monitoring of the fixed means, the CO abnormality determining means receives a CO gas leakage appliance estimation signal from the appliance estimation means, and instead of using the time in the corresponding flow rate category of the registered flow rate, the monitoring time is significantly shortened in preference. In addition to monitoring the usage and monitoring the information together with the information such as the instrument number, even if some measures for dealing with gas leaks are delayed and used by the customer, the appliance estimation means is used to determine the previous flow rate pattern group. If it is within the specified correlation coefficient with the specified flow rate pattern, the usage time is limited from the very small alarm signal stage, and the usage time is limited every time it is used. Because of this condition, CO gas leakage is extremely small and shuts off in a short time, so the danger to the user is extremely low, and it is possible to respond immediately to the gas company by issuing a warning notification. 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. Flow rate calculation means, flow rate storage means for classifying and storing the flow rate and flow rate obtained by the flow rate calculation means, and 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 Flow rate registration means for registering a flow rate at the time of determination as an instrument flow rate from the average flow rate calculated by the average flow rate calculation means, an abnormality determination means for monitoring the usage time and total flow rate of the flow rate registered by the flow rate registration means, CO gas leakage determination means for inputting an output signal corresponding to the concentration level of carbon monoxide gas from a CO alarm device, and the output signal of the CO gas leakage determination means and the flow rate registration means The apparatus estimation means for storing the flow rate pattern group stored in the flow rate storage means and the registered flow rate, outputting a signal for estimating the CO gas leakage apparatus and shortening the use time limit time, and determining the CO leakage apparatus by the apparatus estimation means. Then, the instrument flow rate storage means for storing the output signal of the CO gas leakage determination means and the flow rate pattern group stored in the flow rate storage means when the flow rate is registered by the flow rate registration means, and the abnormality determination means in parallel with the abnormality determination means. An abnormality determination is performed by a CO abnormality determination unit that monitors the abnormal state of the appliance in use by a registered flow rate from the flow rate registration unit and a signal from the CO gas leakage determination unit, and determines whether there is an abnormality, and the abnormality determination unit and the CO abnormality determination unit. 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.

  Then, the instantaneous flow rate is obtained by the flow rate calculation means, and the sequential flow rate storage means is assigned with an instrument number for each flow area, and the average flow rate is obtained by the average flow rate calculation means, and is registered in the flow rate registration means as the monitoring flow rate. In addition, while monitoring the total flow rate value, usage time after registration, etc., the abnormal judgment means will cause the instrument to be in an incomplete combustion state for some reason, the CO alarm will detect the CO gas leak, and the CO gas leak judgment means will be 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 stored in the device flow rate storage means in the device estimation means from the data group as a device that may leak CO gas. It is estimated from the past flow rate pattern and the registered flow rate whether the device has a flow rate pattern in which CO gas leakage is constantly occurring, and is stored in the device flow rate storage means. The use time is monitored by the abnormality determination means, and the use time is normally monitored in the corresponding flow rate classification. However, the use time monitored when the flow rate pattern group that is estimated to be a CO leakage target instrument enters the instrument estimation means. If the remaining time is shortened, the remaining time is shortened, the monitoring is performed again, the monitoring center is notified, and then any CO gas leakage countermeasures are not taken. If it is estimated that it is within the correlation coefficient, the CO abnormality determination means limits the monitoring to a short usage time, so even if a large flow rate appliance such as a water heater is used in parallel, the usage time is monitored separately. In addition, since the usage time is limited from the stage of a very small amount of CO gas warning signal and the usage time is limited every time it is used, the usage time monitoring is postponed by using a large flow rate device. Because the CO gas leakage is extremely small and is shut off in a short time, the risk to the user is extremely low. It is easy to identify abnormal devices and can respond quickly.

  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 shut-off device and a gas appliance according to Embodiment 1 of the present invention, and FIG.

  FIG. 2 is a control block diagram of the gas cutoff device according to Embodiment 1 of the present invention. In FIG. 2, the same number is attached | subjected to the means which performs the same function as FIG.1 and FIG.3.

  In FIG. 2, reference numeral 36 denotes a CO abnormality determination unit. When the CO gas leak determination unit 29 detects a CO gas leak signal from the CO alarm device 20, the instrument estimation unit 30 stores the flow rate pattern stored in the flow rate storage unit 26. From the registered flow rate of the flow rate registration means 28, it is determined that there is a CO gas leak as a group of flow rate data groups, and the usage time is monitored in parallel with the flow rate registration means 28. Even if the abnormality determination means 32 monitors the usage time of a gas appliance having a larger flow rate than the CO generating instrument, the CO abnormality determination means 36 monitors the usage time in parallel. Further, even if there is no gas leak signal from the CO gas leak determination means 29, it is estimated that the use of the gas leak device is started only by determining the flow rate pattern, and a use time shortening setting signal is output to the CO abnormality determination means 36.

  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. Registered in descending order of instrument flow.

  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 The usage time cutoff time limit that defines the usage time limit time is set corresponding to the case of using for a much longer time, and this set value and the registered flow rate value of the flow rate registration means 28 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 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.

  On the other hand, 36 is a CO abnormality determination means. When the CO gas leak determination means 29 detects a CO gas leak signal from the CO alarm device 20, the appliance estimation means 30 registers the flow rate pattern and flow rate stored in the flow rate storage means 26. From the registered flow rate of the means 28, it is determined that there is a CO gas leak as a group of flow rate data, and the usage time is monitored in parallel with the flow rate registration means 28. Even if the abnormality determination means 32 monitors the usage time of a gas appliance having a larger flow rate than the CO generating instrument, the CO abnormality determination means 36 monitors the usage time in parallel. Further, even if there is no gas leak signal from the CO gas leak determination means 29, it is estimated that the use of the gas leak device is started only by determining the flow rate pattern, and a use time shortening setting signal is output to the CO abnormality determination means 36. That is, when a CO leakage appliance determination signal is output from the appliance estimation means 30 to the CO abnormality determination means 36, a much shorter use time limit time is set in preference to the original time limit of the monitor setting means 33. When an 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 CO abnormality determination means 36, and the interruption means 34 is immediately activated to shut it off.

  Once the appliance estimation means 30 estimates that the CO gas leaks, the CO abnormality determination means 36 monitors the CO-generated instrument flow rate while greatly reducing the usage time. Thereafter, when the appliance flow rate is registered in the flow rate registration means 28 and the usage time is monitored by the abnormality determination means 32, the power supply voltage of the CO alarm device 20 decreases or the 100V power supply is removed and the original CO detection signal is transmitted. At least, when the CO gas leakage leakage device is estimated by the device estimation means 30, the usage time is automatically 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 belonging to this time and the instrument numbers belonging to the respective flow rate ranges are communicated to the center through the communication means 35.

  Next, the operation of the gas shut-off device configured as described above will be described. When a gas appliance held at a customer's house, such as a gas stove 19 or a water heater 14, 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 detected value, and this signal is sent to the flow rate calculation means 25 and calculated as an instantaneous flow rate value. When the flow rate value is detected, it is determined that the flow rate is an appliance flow rate, and the 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 for each predetermined number. The obtained average flow rate is compared with the average flow rate before N times (n = 1 to), and when there is a flow rate change of a predetermined flow rate or more, it is determined that some device is used, and the increased flow rate is registered in the flow rate registration means 28.

  Then, the abnormality determination means 32 measures and monitors the usage time of the used appliance with reference to the monitoring value stored in the monitoring value setting means 33 from the flow rate classification to which the registered flow belongs, that is, the usage time limit time value. Always monitor for abnormal flow rates due to hose disconnection. The flow rate registration means 28 is registered in descending order of the flow rate value obtained by the average flow rate calculation means 27 every time the instrument is used, and the usage time monitoring by the abnormality determination means 32 is the maximum registered in the flow rate registration means 28. Measure and monitor the usage time, giving priority to the appliance flow rate.

  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 leakage signal is output from the CPU 23 to the gas shutoff 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 registration value, a flow rate pattern group stored in the flow rate storage means 26, an appliance number, and a flow rate data group of the appliance flow rate storage means 31. The flow rate pattern group, the registered flow rate, and the instrument number 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 appliance flow rate storage means 31, and a signal is output to the CO abnormality determination means 36 as CO gas leak appliance detection to measure the usage time and start monitoring. To do. At this time, the monitoring judgment time is set to a time significantly shorter than the normal usable time than the instrument flow rate. For example, while the gas table 18 and the gas fan heater 19 are being used, the time monitored from the initial 720 minutes 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 CO abnormality determination means 36 immediately outputs a cutoff signal to the cutoff means 34.

  The normal flow rate registration means 28 registers the appliance flow rates in the descending order, and the abnormality determination means 32 preferentially monitors the usage time in the descending order of the appliance flow rate. When the use of the CO leaking appliance is started and at the same time the hot water heater 14 is used to fill hot water in the bath, the usage time monitoring of the hot water heater precedes the usage time monitoring of the CO leaking appliance. Even if the flow rate of the CO gas leaking device is registered in the flow rate registering unit 28, the CO abnormality determining unit 36 monitors the usage time in parallel with the abnormality determining unit 32 when the device estimating unit 30 identifies and determines the CO leaking device. When used at the same time as the water heater 14 for a long time, even if the usage time in the abnormality determination means 32 does not reach the determination value, the CO abnormality determination means 36 monitors the usage time of the CO leakage device and restricts the use. As soon as the time is reached, a shut-off signal is output to the shut-off means 34 to stop gas use.

  Even when the instrument is reused, if the CO gas leak determination means 29 detects the CO gas leak signal in the same manner, the instrument estimation means 30 uses the data of the instrument flow rate storage means 31 and the CO gas leak instrument in accordance with, for example, a correlation coefficient. Whether or not, and a CO gas leakage appliance detection signal is output to the CO abnormality determination means 36 to greatly limit the use time. When a CO leakage appliance determination signal is output from the appliance estimation means 30 to the CO abnormality determination means 36, a much shorter use time limit time is set in preference to the original limit time of the monitoring value setting means 33. At the same time, the communication information 34 is sent to the center of the gas company together with the call information of the usage time limit by the detection of the CO gas leak, together with the equipment information such as the equipment number of the CO leak detected together with the center. 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 30 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. Also, when the gas concentration level increases at a stretch and the CO gas leakage determination means 29 receives an extremely dangerous alarm signal with the maximum concentration, it outputs to the CO abnormality determination means 36 and immediately outputs a shut-off signal to the shut-off means 34. Supply is stopped 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 estimated as a gas leak device, the CO abnormality determination means 36 monitors the usage time independently without being affected by other large flow rate devices, greatly restricts the usage time monitored and classifies and stores it. By reporting the instrument number to the center via communication means, it is possible to notify the gas company which instrument is causing the trouble, ensuring the safety of gas appliance consumers, and carbon monoxide due to CO gas leakage In addition to preventing poisoning and other life-threatening risks, it is easy to identify equipment by reporting information such as equipment numbers to the gas company's center, and gas companies take safety measures at an early stage when the CO gas concentration level is low Or it can be taken by gas consumers and 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 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 Shut off means 35 Communication means 36 CO abnormality determination means

Claims (1)

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 an instantaneous flow rate value from a detection value of the flow rate detection means;
A flow rate storage means for storing a flow rate pattern group when the flow rate obtained by the flow rate calculation means is equal to or greater than a predetermined flow rate;
Average flow rate calculation means for averaging the instantaneous flow rate values obtained by the flow rate calculation means to obtain an average flow rate value;
When the average flow rate calculated by the average flow rate calculation unit changes more than a predetermined flow rate, a flow rate registration unit for registering the increased flow rate as a device flow rate,
An abnormality determination means for monitoring a continuous use limit time or a maximum use flow rate according to a flow rate range of the appliance flow rate registered by the flow rate registration means;
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 alarm, the flow rate pattern group stored in the flow rate storage means and the flow rate of the appliance registered in the flow rate registration means Instrument flow rate storage means for storing
The appliance flow rate registered by the flow rate registration means, the flow rate pattern group stored in the flow rate storage means, the flow rate pattern group stored in the appliance flow rate storage means and the appliance flow rate are compared. A device estimation means for estimating a CO gas leakage device, and shortening the use time limit when the CO gas leakage device is estimated;
In parallel with the monitoring by the abnormality determination unit, the abnormal state of the appliance used is monitored by the signal from the flow rate registration unit, the appliance flow rate, the use time limit time, and the CO gas leakage determination unit, and whether or not there is an abnormality. CO abnormality determining means for determining;
A shut-off means for shutting off gas supply when an abnormality judgment is established by the abnormality judgment means or the CO abnormality judgment means;
When a CO leaking instrument is identified by the instrument estimating means, a communication means for reporting instrument information;
Gas shut-off device with

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