JP5310035B2 - Gas shut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an operating time limiting function proper by properly registering the flow rate of a flow rate control device. <P>SOLUTION: This gas shut-off device includes a flow rate change determining means 13 for determining whether a flow rate is changed from an average flow rate or not, a flow rate registering means 14 for registering the change in flow rate when the detected flow rate change is increasing changed, and decreasingly correcting the registered flow rate near the flow rate change in decreasing change, a registered flow rate totalizing means 15 for operating the total value of the registered flow rate, a flow rate difference operating means 16 for determining a flow rate difference from the total value of registered flow rate and the average flow rate, a flow rate correcting determining means 17 for adding the flow rate difference determined in detecting the decreasing change by a flow rate change detecting means to a flow rate registration value with priority, when the registered flow rate total value and the average flow rate are different in detecting the decreasing change by the flow rate change detecting means 13, and the flow rate difference obtained from the registered total flow rate and the average flow rate is positive, and then correcting the registered flow rate with the detected decreasing flow rate, and a shut-off means 19 for shutting off gas supply when the abnormality is determined by an abnormality determining means 18 on the basis of the registered flow rate and a monitoring determination value. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a gas shut-off device, and more particularly to a gas shut-off device that prevents erroneous shut-off due to a use time limiting function even when the use flow rate is changed by flow control of the instrument itself.

  Conventionally, as this type of gas shut-off device, the flow rate measuring means that outputs a flow rate signal corresponding to the amount of gas passing through, and the increase / decrease of the individual appliances in use when the flow rate signal increases / decreases are estimated. Individual instrument estimation means for outputting the individual calculation flow rate and the used time, individual flow registration means for registering the flow rate of the individual instrument to be used in advance and outputting the registered individual flow rate and usage time, and individual flow memory for storing the registered individual flow rate And an error that outputs an individual abnormality signal when the estimated individual calculation flow rate of the increased / decreased appliance is not included in the registered individual flow rate of the individual flow rate storage means and the continued use time of the increased / decreased appliance continues for the first predetermined time or more A flow rate determination unit, a notification unit that receives the individual abnormality signal and gives a warning notification of an abnormality in the gas flow rate, or a blocking unit that blocks the gas passage, and an estimated individual performance of the individual instrument estimation unit When the flow rate is not included in the registered individual flow rate of the individual flow rate storage means and the time used by the device of the individual device estimation means is longer than the second predetermined time and shorter than the first predetermined time, the estimated individual flow estimation means There has been disclosed a gas shut-off device provided with a constant individual flow rate registering means for registering the calculated flow rate in the individual flow rate storage means (see, for example, Patent Document 1).

  The configuration of the conventional gas shut-off device will be briefly described with reference to FIG. 4. Reference numeral 101 denotes a flow rate measuring means, which is a flow rate sensor attached to a gas meter. Reference numeral 102 denotes an individual appliance estimation means that calculates the flow rate signal of the flow rate sensor 1 as an average flow rate for a fixed measurement period (30 seconds), estimates the increase or decrease of the individual flow rate in use based on the increase or decrease of this average flow rate, The estimated individual calculation flow rate Q and the time used are output. When the average flow rate increases, the individual device estimation means 102 determines that the increased amount of gas device has been used, and when the average flow rate decreases, determines that the decreased amount of gas device has been stopped, Estimate individual equipment. When the flow rate of the appliance coincides with the flow rate change amount by the reduction correction by various controls, for example, if the difference between the registered flow rate and the flow rate change amount falls within a predetermined flow rate range, the flow rate is determined as the corresponding flow rate and the correction is made. Reference numeral 103 denotes an individual flow rate registration means, which is a setter for inputting in advance the flow rate (Qi) of an individual appliance used in the home. Reference numeral 104 denotes individual flow rate storage means for sequentially storing the flow rate (Qi) of the individual appliance of the individual flow rate registration means 103 and the flow rate of the individual flow rate registration means 107 as Q1, Q2, Q3,. 105 is an abnormal flow rate determination unit, and the estimated individual flow rate Q output from the individual appliance estimation unit 102 is not included in {Q1, Q2, Q3,..., Qn} of the individual flow rate storage unit 104, and the estimated individual flow rate Q Continues for the first predetermined time (10 minutes) or more, the individual abnormality signal E is output. Reference numeral 106 denotes a notification means or a cutoff means, which is provided with an LCD or LED for receiving a warning in response to the individual abnormality signal E, or a cutoff valve for blocking the gas passage. 107 is an always individual flow rate registering means, and when the estimated individual flow rate Q output from the individual flow rate estimating means 102 is not less than the second predetermined time (3 minutes) and within the first predetermined time (10 minutes), the estimated individual flow rate Q is output to the individual flow rate storage means 104.

  Next, the operation of the configuration of the conventional example will be described. Based on the flow rate signal of the flow rate measuring means 101, the average flow rate is calculated. A change flow rate between this average flow rate and the previous average flow rate is obtained to determine whether the change is an increase or a decrease, and an estimated individual calculation flow rate Q is obtained by each process. It is determined whether this estimated individual calculation flow rate Q newly appearing as a result of the increase / decrease process is included in the individual flow rate storage means 104 and whether it has been used for the first predetermined time (10 minutes). If it is not included and is used for 10 minutes or more, the notification means or blocking means 106 is operated. If it is not included or is not used for 10 minutes or more, it is judged whether it is an unregistered flow rate, 3 minutes or more, or 10 minutes or less. The means 107 performs registration processing in the individual flow rate storage means 104.

  If there is an increase in the average flow rate of Qt (for example, Q2 + Q3 as an example) due to simultaneous use of a plurality of devices, and the usage time is 7 minutes, for example, the average flow rate decreases after 7 minutes, the individual device estimation means 102 The estimated individual flow rate Qt is output. The estimated individual flow rate Qt is registered in the individual flow rate storage unit 104 by the individual flow rate registration unit 107 at all times because the usage time is 3 minutes or more and 10 minutes or less. Thereafter, since it is registered in the individual flow rate storage means 104, even if this flow rate appears for 10 minutes or more, it is not blocked. That is, it is possible to reduce erroneous interruption due to gas appliances that are often started up simultaneously. Further, when there is a new individual flow rate Qk (3 minutes or more and 10 minutes or less) due to a replacement device or the like, the estimated individual flow rate Qk is output from the individual device estimation means 102. The estimated individual flow rate Qk is registered in the individual flow rate storage unit 104 by the individual flow rate registration unit 107 at all times because the usage time is 3 minutes or more and 10 minutes or less.

Thereafter, since it is registered in the individual flow rate storage means 104, even if this flow rate appears for 10 minutes or more, it is not blocked. Individual appliances used in each home can be stored in advance to prevent accidents due to gas leaks due to flow rates other than the individual appliances, and prevent accidental interruption due to simultaneous startup of appliances or replacement of appliances.
JP 7-44239 A

  However, in the above-described conventional configuration, the function of preventing a gas passage when a flow rate other than that registered in the individual flow rate storage means is newly detected or by erroneously registering as a registered individual flow rate is prevented. However, when the individual device estimation means estimates the individual device, the device registered as the registered individual flow rate stops using when the flow rate gradually changes within the normal range due to the flow control of the device itself. If this happens, the value will be different from the individual flow rate at the time of registration, and there may be cases where the registered individual flow rate will be deleted by mistake when deleting the registered individual flow rate. If one remains, the time limit for continuous use of the instrument will be shortened, and the gas shut-off valve will operate in a shorter time than expected to stop the gas supply. On the other hand, if the one with the larger registered individual flow rate is deleted and the smaller one remains, the continuous use time limit will be extended. It will have a problem in terms.

  For example, when using a shower, the water heater may control the gas flow rate according to the temperature deviation in order to keep the set hot water temperature, and the combustion amount may be varied, and the fan heater etc. may have a gas flow rate to keep it at a constant room temperature. There are cases where the amount of combustion is controlled and variable. In such a case, the estimated individual calculation flow rate obtained by the individual device estimation unit at the start of the use of the device and registered in the individual flow rate registration unit gradually decreases the gas flow rate by the combustion amount control corresponding to the load fluctuation, and the initial estimation is performed over time. There may be a difference from the individual calculation flow rate. Normally, when the other instrument stops using or a large flow rate change occurs while using multiple devices, the estimated individual calculation flow rate of the individual flow rate registration means is re-registered based on the change amount. If the estimated individual calculation flow rate is changed gradually, the re-registration process of the estimated individual calculation flow rate is not executed. In some cases, the actual flow rate that has been reduced in step 1 and the total value of the registered flow rate may be different. In such a case, the total value of the registered flow rate will be monitored in a state larger than the actual flow rate. The continuous use time limit is shifted to a short time, leading to erroneous interruption. In other words, there is a problem that erroneous interruption cannot be prevented because monitoring different from the actual use flow rate is performed.

The present invention solves the above-mentioned problem. When detecting the stop of use of the instrument, the registered individual flow rate after deleting the predetermined registered individual flow rate is compared with the average flow rate value obtained by the flow rate calculation means, and a difference of a predetermined value or more is obtained. By correcting the registered individual flow rate based on the difference data, the registered individual flow rate can be brought close to the actual used flow rate even in the usage mode in which the gas flow rate gradually changes with a small change rate, The present invention provides a highly safe gas shut-off device without erroneous shut-off.

In order to solve the above-described conventional problems, the gas shutoff device according to the present invention includes a flow rate detection unit that measures a flow rate every predetermined period, and a flow rate calculation unit that calculates an instantaneous flow rate value based on the detected value . the average and the flow rate computation unit, a flow change determination unit that determines whether the flow rate changes chromatic than the present value and the previous value of the average flow rate determined, at decision detected flow change is an increase change rate to obtain the average flow rate from the instantaneous flow rate the variation flow rate registration, also mean reduction change determination at the time of the flow rate registration unit for deleting the registered flow rate near the flow rate change amount, a registration total flow rate means for calculating a total value of registered flow rate, the total value of the registered flow rate a flow rate difference calculating means for calculating a flow rate difference from the flow rate, when determining the decrease change in flow rate change decision unit, when than the sum of the registered flow rate is large previous value of the average flow, the average flow rate and the total value of registered flow rate flow rate obtained in the previous value of the The added processing to the maximum flow rate value of previously flow registration, then detected and line Cormorant flow correction determining means to delete the close registration flow to decrease the flow rate, the monitoring value storage unit for storing a determination value for monitoring the use state of the device And an abnormality determining means for determining the presence / absence of an abnormality from the registered flow rate of the flow rate registering means and the determination value of the monitoring value storage means, and a shutting means for shutting off the gas supply when the abnormality determination is established by the abnormality determining means.

  According to the above invention, when a device is used and the flow rate of the device is registered, after a slight increase in flow rate change that is not determined as a flow rate change by the flow rate change determination means, some device stops using or significantly reduces the flow rate. However, if there is a flow rate difference between the registered flow total value before the flow rate change detection and the average flow rate, it is determined that the flow rate change has occurred before registration. The flow rate difference from the flow rate is calculated, added to the largest registered flow rate among the registered flow rates, corrected, and then the closest registered flow rate registered in the flow rate registration unit from the reduced flow rate detected by the flow rate change detection unit By correcting the decrease, the total flow rate of the equipment used and the total registered flow value to be monitored can be monitored in the corresponding usage time, and the flow rate that has changed slightly by mistake is mistaken for the equipment. Register and monitor the flow rate for the usage time, cut off the usage time early, increase the number of unnecessary dispatches of gas companies, or stop for a short time although it can be used for a long time like a heater, etc. It is possible to prevent the deterioration and high safety.

  The gas shut-off device of the present invention is used when a plurality of appliances are used and a plurality of appliance flow rates are registered. If stop or drastic flow reduction control is performed, priority is given to the correction of the flow rate value registered by the flow rate difference between the average flow rate of all the instrument flows used before detection of the flow rate change and the total flow rate of the flow rate registration means. Next, by looking for the registered flow rate that is closest to the detected decrease change amount, and correcting the decrease, it is always possible to monitor the average flow rate of all devices used and the total flow rate of the flow rate registration means that always monitors the flow rate. Since the flow rate registration is not performed when there is a difference between the actual total device usage and the total registered flow rate, the flow rate registration at the time of the flow rate change is not performed. There is no trouble of monitoring the usage time with the flow rate and shutting off the usage time early, and there is no increase in the number of unnecessary turnouts of gas companies due to early shutdown, and it can be used for a long time, especially in the winter heating equipment. However, it can be prevented from being stopped in a short time and the usability is lowered, and there is an effect of high reliability and safety.

In order to achieve the above object, the present invention is a gas shut-off device that monitors the use status of a plurality of gas appliances and shuts off the supply of gas when an abnormality occurs , and is a flow rate detecting means for measuring the flow rate at predetermined intervals. A flow rate calculation means for calculating an instantaneous flow rate value from a detection value of the flow rate detection means, an average flow rate calculation means for calculating an average flow rate from a predetermined number of instantaneous flow rates obtained by the flow rate calculation means, and a current time of the obtained average flow rate The flow rate change judging means for judging the presence or absence of the appliance change flow rate from the value and the previous value, and when the increase change judgment is made by the flow rate change judgment means, the flow rate change amount is registered, and when the decrease change judgment is made, it is close to the flow rate change amount. determined and the flow rate registration unit for deleting the registration flow rate, and the registration total flow rate means for calculating a total value of registered flow rate, the flow rate difference from the average flow rate total value of registered flow rate and determined in the mean flow rate of the registered flow summing means A flow rate difference calculating means, when determining the decrease changes in the flow rate change decision unit, when than the sum of the registered flow rate is large previous value of the average flow rate was determined in the previous value of the average flow rate and the total value of registered flow rate the flow rate difference is the addition processing to the maximum flow rate value of previously flow registration, storing and subsequent detected close to reduce the flow rate registration flow line power sale rate correction determination means the removal of the determination value for monitoring the use state of the device monitoring value Storage means, abnormality determination means for determining the presence / absence of an abnormality from the registered flow rate of the flow rate registration means and the determination value of the monitoring value storage means, and a blocking means for cutting off the supply of gas when the abnormality determination is established by the abnormality determination means; Consists of.

  Then, the start of use of the instrument is detected by the flow rate detection means, converted to an instantaneous flow rate by the flow rate calculation means, and the average flow rate is obtained and registered by the flow rate registration means. However, a plurality of instruments are used and the instrument flow rate is registered. However, the flow rate change is not determined by the flow rate change judging means by the flow rate control of the device, and after a slight flow increase change continues for a long time, it is determined that the flow rate change is the first time that any device in use is throttled or stopped. If there is a flow rate difference between the registered total flow rate and the average flow rate due to a slight increase in flow rate, it is determined that a small flow rate change has occurred before the flow rate change, and the flow rate difference between the registered flow rate total value and the average flow rate is obtained and registered The corrected flow rate is corrected from the nearest registered flow rate, and the total flow rate of the equipment used is matched with the monitored flow rate registered value sum, and then the reduced flow rate detected by the flow rate detection unit by the flow rate correction unit By using the flow rate registration means to reduce the flow rate, the flow rate of all the instruments used can be registered and monitored at the corresponding usage time. The usage time is monitored and the usage time is cut off early, and the number of unnecessary dispatches of the gas company increases, while it can be used for a long time like a heater, but it stops in a short time and the usability is reduced. It can be prevented and is highly safe.

  Further, it is a program for causing a computer to execute all or part of the means of the gas cutoff device.

  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 configuration 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 2 is installed at the entrance of the gas supply pipe 1 in each household, and various gas appliances used in each home are installed by branching from the gas pipe 3 after passing through the gas shut-off device 2. Piping to place and gas is supplied. For example, a water heater 4 is installed outdoors, and hot water generated by the water heater 4 is installed in a kitchen hot water tap 5, a bath 6 in which a bathtub and a shower device are installed, a living room and the like through a water pipe. It is supplied to the floor heating 7 and forms various usage forms.

  In addition, when indoors, gas is supplied to a gas table 8 installed in a kitchen, a gas fan heater 9 installed in a living room, a bedroom, or the like, and is used as needed.

When the installed gas appliance is used and gas consumption occurs, the amount of use is measured by the gas shutoff device 2, and the amount of use is accumulated and stored as a meter reading value. The data stored in the gas shut-off device 2 is subjected to predetermined information processing based on a periodic data request command from the gas company, and then the gas fee, gas usage, discount service provided by the gas company, etc. This information is used by consumers and gas companies.

  The gas shut-off device 2 has a gas flow path having a gas inlet and a gas outlet, and is provided with a flow rate detection means 10 for measuring the gas flow rate. Note that there are various methods as the flow rate detection means 10, and an ultrasonic signal is transmitted from one to the other with 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.

  Accordingly, the flow rate detection means 10 using an ultrasonic sensor will be briefly described. 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, and a control circuit is provided. Can be switched between transmission and reception. The flow rate is measured by processing signals from the first transceiver and the second transceiver, and ultrasonic waves are transmitted from upstream to downstream. And it receives with a 2nd transmitter / receiver, and measures propagation time by a time measuring means.

  Next, an ultrasonic signal is transmitted from the downstream to the upstream by the switching means, and the propagation time is measured. Then, the flow rate calculation means 11 obtains the flow rate value by multiplying the difference in ultrasonic propagation time between the first transmitter / receiver and the second transmitter / receiver by the flow rate coefficient corresponding to the size of the flow path and the fluid flow state. The flow rate is obtained every predetermined cycle as an instantaneous flow rate value.

  Then, the instantaneous flow rate value obtained by measuring every predetermined cycle is input to the average flow rate calculation means 12, and a predetermined number of instantaneous flow rate values are collected to be calculated as an average flow rate value. The flow rate change determining means 13 determines the change in the presence or absence of the appliance flow rate from the average flow rate value. The change is determined from the average flow rate obtained this time and the previous average flow rate. Thereafter, the current average flow rate is stored in the flow rate change determination means 13 in time series. That is, the flow rate change determination unit 13 compares the average flow rate value calculated by the current average flow rate calculation unit 12 with the previous average flow rate, and determines whether or not there is a change flow rate or a flow rate change rate that exceeds a predetermined value. Then, it is determined whether or not the appliance has been used or whether or not the flow rate has changed. For example, when the customer uses the water heater 4, the flow rate value changes from zero to a predetermined flow rate, or from the average flow rate obtained when the water heater 4 is used while using other appliances and the previous average flow rate. The use / stop of the device or the presence / absence of the flow rate change is determined based on whether the flow rate change rate or the flow rate change amount is greater than or equal to a predetermined value.

  When the change in flow rate is detected by the flow rate change determination means 13, it is determined whether the use of the instrument is started or the use of the instrument is stopped. Specifically, when the instrument is used, the change in the flow rate is registered as the flow rate registration means. 14 is set as a registered flow rate value. Here, the flow rate registration unit 14 includes an increase flow rate registration unit 14a and a decrease flow rate registration unit 14b. Every time a change on the flow rate increase side is detected, it is determined that the appliance has been additionally used, and each time the flow rate change is newly set as a flow rate registration value. On the other hand, when the use of the appliance is stopped, it is determined that the registered flow value that is close to the flow rate change amount among the registered flow values registered in the flow registration means 14 is deleted from the registered flow value. Change and register the registered flow again in descending order. Similarly, in this deletion process, every time a change on the flow rate decrease side is detected, it is determined that the use of the appliance has been stopped, and the deletion process of the registered flow rate value is executed each time. If the flow rate change amount does not match the registered flow rate value, obtain the change rate from the registered flow rate that is the smallest difference between each registered flow rate and the flow rate change amount, or the ratio between each registered flow rate and the flow rate change amount and the registered flow rate. The flow rate value with the smallest change rate is corrected to decrease with the flow rate change value, and the flow rate value of the closest instrument is determined to be changed, and the registered values are changed in ascending order.

Next, the registered flow rate summing unit 15 obtains a total flow rate of the flow rate values registered by the flow rate registering unit 14. The flow rate difference calculating means 16 determines the presence or absence of a flow rate difference from the total value of the registered flow rates in the registered flow rate summing means 15 and the average flow rate of the entire device used by the average flow rate calculating means 12, and determines the flow rate difference. Reference numeral 17 denotes a flow rate correction determination means. The flow rate change determination means 13 inputs a decrease-side flow rate change detection signal and is detected by the flow rate difference calculation means 16 from the outputs of the registered flow rate summation means 15 and the average flow rate calculation means 12. Is input, the flow registration correction request of the next procedure is output. First, in this case, it is determined that a flow rate difference has occurred immediately before the flow rate change, and a minute change that is not detected by the flow rate change determination means 13 has continued, and the flow rate difference is already registered. Precisely add and correct the largest flow rate value among the flow rates. Secondly, with respect to a new flow rate registration value in which the flow rate difference from the actual flow rate is corrected, the reduced flow rate registration unit 14b searches for a device corresponding to the reduced flow rate detected by the flow rate change determination unit 13 and decreases from the flow rate registration unit 14. to correct. Continue until this flow rate difference disappears.

  And the abnormality determination means 18 monitors an apparatus used by the set registration flow volume. The monitoring value storage means 19 stores a time limit value for use time corresponding to each flow rate range, a monitoring judgment value for the maximum use flow rate, or the like. 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 monitoring time storage means 19 stores the usage time cutoff time limit that defines the usage time limit time corresponding to the case where it has been used for a much longer time. By comparing and determining this set value and the registered flow rate value of the flow rate registration unit 14 by the abnormality determination unit 18, the registered flow rate value does not exceed the maximum use flow rate value or the usage time of the appliance corresponds to the registered flow rate. Monitor whether the time limit for continuous use is exceeded. When the abnormality determination means 18 determines that an abnormality has occurred, a cutoff signal is sent to the cutoff means 20 to stop the gas supply. In addition, the notification communication means 21 displays the shut-off state and shut-off content on a liquid crystal display element and the like, and notifies the center of the gas company that is monitoring the safety of the gas by communication such as a telephone line.

  Next, operation | movement of the gas interruption | blocking apparatus 2 comprised as mentioned above is demonstrated. When a gas appliance held at a customer's house, such as a water heater 4 or a gas stove 9, is used, the flow rate is detected by the flow rate detection means 10. 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 11 and converted into an instantaneous flow rate value. Calculated as the average flow value. The obtained average flow rate is periodically determined by the flow rate change determination means 13 for the presence or absence of changes in the appliance flow rate. The flow rate change determining means 13 stores a plurality of time-series data after determining the flow rate change. The presence or absence of a flow rate change is obtained from the past average flow rate stored in the flow rate change determination means 13 (for example, the previous or previous time or the average flow rate stored N times before) and the current average flow rate. That is, using the average flow rate value output at a predetermined interval, the use of the appliance or the stoppage of the appliance is determined from the change state, and the flow rate change at the time of change is used as the registered flow rate of the appliance to be used. By newly registering or by correcting or deleting the registered flow rate that has already been registered, it is possible to accurately set the registered flow rate corresponding to the device used at the time of change. There may be a change in flow rate due to instrument stop or various controls when there is a decrease, and the change in flow rate may not match the registered flow rate. If it falls within a predetermined flow rate range or within a predetermined rate, the flow rate registration means 14 will determine that the device is a corresponding device. Decrease correction. If it is within the predetermined range, the difference between the registered flow rate and the reduced flow rate becomes an error between the actual flow rate and the registered flow rate.

For example, when the water heater 4 is used, for example, when the past flow rate is zero, the flow rate changes to 1500 L / h or the like, and the change is compared with the current average flow rate and the past average flow rate to determine whether there is a change. If the rate of change or the amount of change is greater than or equal to a predetermined value, it is determined that there is a change, and some device is used, and is registered in the flow rate registration means 14. Alternatively, when the water heater 4 is used while the gas table 8 is used, the flow rate of the gas table 8 is stored in the past flow rate of the flow rate change determination unit 13, and the flow rate change determination unit 13 calculates the current average flow rate and the past flow rate stored value. Similarly, the change flow rate is obtained, and similarly, the change rate from the current flow rate or the change flow rate is registered in the flow rate registration means 14 when there is a change when the change flow rate is greater than or equal to a predetermined value. Here, in the flow rate registration means 14, the average flow rate obtained when the flow rate changes is input to the increase flow rate registration means 14a and the decrease flow rate re-registration means 14b. When a flow rate increase and determination signal is input by the flow rate change determination means 13, an increased flow rate with the previous average flow rate is registered. When any of the devices is stopped or the flow rate is changed during use of a plurality of devices, the flow rate change judging means 13 determines whether the change is a decrease from the past flow rate stored value and the average flow rate, and outputs the reduced change flow rate. Then, the flow rate registration means 14 deletes or reduces the closest flow rate registration value among the flow rates registered from the decreasing change flow rate. If the flow rate change amount does not match the registered flow rate value, find the smallest registered flow rate or the change rate between the registered flow rate and the difference between each registered flow rate and flow rate change amount. The small flow rate value is corrected to decrease by the flow rate change value, and it is determined as the flow rate change of the nearest instrument, and the registered value is changed in ascending order.

All the registered flow rate values are added by the registered flow rate summing unit 15 to obtain the total flow rate. The flow rate difference calculating means 16 calculates the flow rate difference from the calculated average flow rate and the registered flow rate total value. If the flow rate difference is not zero, it is determined that the flow rate of the appliance used is not registered in the flow rate registration unit 14 to be monitored, and a flow rate difference signal is output to the flow rate correction determination unit 17. When a plurality of devices are used and registered in the flow rate registering means 14, when the registered device flow rate has a slight flow rate increase change, any device in use stops or changes in flow rate decrease. If it is performed, when the decrease change behavior is detected by the flow rate change determination means 13, it is output to the flow rate registration means 14 and the flow rate correction determination means 17.

When the flow rate difference signal and the flow rate change detection signal are input, the flow rate correction determination unit 17 issues a flow rate registration control instruction according to the following procedure. When there is a positive flow rate difference and the amount of change in the decrease flow rate, the flow control is performed on the instrument that is already used until just before the decrease change occurs, and a slight increase in flow rate that is not detected by the flow rate change determination means 13 is continued for a long time. In this case, the registered total flow rate is different from the average flow rate at the time when the decrease change is detected. That is, when the difference in flow rate obtained by subtracting the average flow rate for using the appliance from the registered total flow rate is positive, it is determined that any of the registered device flow rates has changed and decreased. The flow rate difference is added and corrected to the maximum flow rate value registered by the increased flow rate registering unit 14a of the flow rate registering unit 14 with the previously obtained flow rate difference. This is because there are many cases where the instrument is relatively equipped with a flow control function. By this process, the registered flow rate total value matches the average flow rate immediately before the decrease change is detected. Next, a decrease correction of the instrument flow rate corresponding to the flow rate decrease detected by the flow rate change determination means 13 is performed. Since the monitored instrument flow rate total and the flow rate registration total value are matched, the appliance flow rate corresponding to the flow rate reduction amount is searched for the nearest registered flow rate by the reduced flow rate registration means 14b and deleted or corrected for reduction. For example, the ratio between the registered flow rate and the difference between the registered flow rate and the reduced flow rate is obtained to determine the degree of change from the registered flow rate, and it is determined that the instrument having the smallest flow rate has caused the flow rate change. The detected decreased flow rate is corrected to decrease from the registered flow rate determined to have caused the flow rate change. If a decrease correction is made and the flow rate difference remains, a decrease correction is made from the next closest flow rate registration value. As a result, the flow rate is corrected until there is no difference.

When using the water heater 4 while the gas table 8 or the gas fan heater 9 is in use, when it is used for floor heating or the like, the initial water temperature is high when the load at the initial stage of operation is large, when the load at the stable state is small, or at the shower. When the hot water temperature stabilizes when the difference between the temperature and the set temperature is large, the amount of combustion changes greatly. In such a case, the increased flow rate registration unit 14a of the flow rate registration unit 14 registers the increased flow rate of the gas table 8 and the gas fan heater 9, and further registers the flow rate of the water heater 4. In the initial stage of operation of the water heater 4, the flow rate of use of the water heater 4 is changed and the average flow rate value at this time is registered in the flow rate registration means 14 as a registered flow rate. When the operation is continued, when the room temperature is stabilized, the combustion amount, that is, the gas flow rate is controlled in a decreasing direction by proportional control. Thereafter, when the door or window of the room is opened, the room temperature gradually decreases, and the gas flow rate is controlled in the increasing direction by proportional control. At this time, there is a case where the flow rate increases so as not to be detected by the flow rate change determination means 13. When such a minute change that cannot be determined by the flow rate change determination unit 13 continues for a long time, the flow rate registered in the flow rate registration unit 14 and the average flow rate obtained periodically do not match. . When another device is used at such a time, first, the flow rate change due to the flow rate change is first registered in the flow rate registration means 14 as the device flow rate, and then the gradually increased flow rate amount is added to the registered flow rate total value and the average. The flow rate difference calculating means 16 obtains the flow rate difference from the flow rate. This flow rate difference is output as a change flow rate of the flow rate of the instrument already registered before newly registering the flow rate so that the flow rate correction determination means 17 first adds the flow rate difference first. The increased flow rate registering unit 14a of the flow rate registering unit 14 adds to the previous registered flow rate without newly registering. The result average flow rate matches the registered total flow rate. When there are a plurality of registered flow rates before new registration, the gradually increased flow rate difference is added to the larger of the registered flow rates. In other words, a large flow rate instrument is often equipped with electronic control such as proportional control.

  Then, the abnormality determination means 18 monitors the used appliance with reference to the corresponding use time limit time in the monitor value storage means 19 with the reset registered flow rate. When the monitoring time elapses and an abnormality occurs, safety is ensured by operating the shut-off means 20 and stopping the gas supply.

  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 there is a gradual increase in the flow rate when the flow rate change determination unit 13 does not detect a flow rate change greater than or equal to the predetermined value, it is determined that the flow rate has changed due to the control of the already registered device depending on the timing of using the device. First, the flow rate difference is added and corrected to the registered appliance flow rate, and the flow rate registration corresponding to the flow rate change is performed in a state where the total value of the flow rate registration means 14 and the actual appliance flow rate in use immediately before the change detection are matched. The processing can be performed, and the maximum registered flow rate can be monitored by the abnormality determination means 18, and an appropriate use restriction function corresponding to the device used can be secured. Alternatively, if the flow rate is reduced, erroneously re-registering the flow value that has changed slightly due to the minute flow rate and monitoring the usage time at that flow rate can prevent erroneous shut-off. However, it is possible to prevent late shut-off and early shut-off, which is extremely safe and reliable, and can reduce unnecessary dispatch of gas companies due to early shut-off. .

  As described above, the gas shut-off device according to the present invention is intended to optimize the function of limiting the usage time of appliances whose usage is slightly changed. The present invention can be applied to all appliance monitoring devices such as monitoring the amount of electricity used for each appliance of a digital power meter that monitors the current for each appliance by controlling the current of the appliance.

The block diagram which shows the installation mode of the gas cutoff device and gas appliance in Embodiment 1 of this invention Control block diagram of gas shutoff device in embodiment 1 of the present invention Control block diagram of a conventional gas shut-off device

DESCRIPTION OF SYMBOLS 10 Flow rate detection means 11 Flow rate calculation means 12 Average flow rate calculation means 13 Flow rate change determination means 14 Flow rate registration means 15 Registered flow rate total means 16 Flow rate difference calculation means 17 Flow rate correction determination means 18 Abnormality determination means 19 Monitor value storage means 20 Shut off means

Claims (2)

A gas shut-off device that monitors the usage status of a plurality of gas appliances and shuts off the gas supply when an abnormality occurs.
Flow rate detection means for measuring the flow rate at predetermined intervals ;
A flow rate calculation means for calculating an instantaneous flow rate value from a detection value of the flow rate detection means;
Average flow rate calculating means for obtaining an average flow rate from a predetermined number of instantaneous flow rates obtained by the flow rate calculating means;
A flow rate change determination means for determining the presence or absence of the appliance change flow rate from the current value and the previous value of the obtained average flow rate,
When increasing the change determination by the flow change determination unit flow rate variation and flow rate registration, also reduces the change determination time is a flow registering means for deleting the registration flow rate close to the rate variation,
A registered flow total means for calculating the total value of the registered flow;
A flow rate difference calculating means for obtaining a flow rate difference from a total value of registered flow rates of the registered flow rate summing means and an average flow rate obtained from the average flow rate ;
When it is judged the reduced change in the flow rate change decision unit, when than the sum of the registered flow rate greater previous value of the average flow, the flow rate the flow rate difference obtained in the previous value of the average flow rate and the total value of registered flow rate above and adding process to the maximum flow rate value of the registration, and then cormorant row to delete the registered flow rate near the detected decrease flow rate correction determination means,
Monitoring value storage means for storing a judgment value for monitoring the use state of the appliance;
An abnormality determination means for determining the presence or absence of abnormality from the registered flow rate of the flow rate registration means and the determination value of the monitoring value storage means;
A shut-off means for shutting off the supply of gas when the abnormality judgment is established by the abnormality judgment means ;
Gas shut-off device with A program for causing a computer to function as all or part of means of the gas shut-off device according to claim 1.