JP2008134064A - Gas shut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately secure a use restriction function of a tool whose use gas amount varies. <P>SOLUTION: This gas shut-off device comprises: a flow detecting means 17 for measuring the gas flow; a flow arithmetic means 19 for calculating the flow value from the detected value of the flow detecting means 17; an average flow arithmetic means 12 for averaging instantaneous flow values to determine an average flow value; a flow storing means 14 for storing the average flow value; a flow variation determining means 15 for determining that flow varies when the difference between the average flow value and the stored value of the flow storing means 14 is larger than a predetermined variation value; a flow registering means 16 for registering/deleting a part corresponding to the flow variation when the flow variation determining means 15 determines that flow varies; a registered flow determining means 20 for determining whether the registered flow after deletion processing by the flow registering means 16 is normal; and a registered flow correcting means 21 for correcting the registered flow so as to make it close to the average flow value using the differential flow when the registered flow after the variation processing is abnormal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas shut-off device, and more particularly, to a device that prevents erroneous shut-off due to a tool use restriction function even when a use flow rate is changed by flow control of the tool 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 registration means for registering a calculated flow rate in an individual flow rate storage means (see, for example, Patent Document 1).

  The gas cutoff device of Patent Document 1 will be briefly described with reference to FIG. 6. 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, which calculates the flow rate signal s of the flow rate sensor 1 as an average flow rate for a fixed measurement period (30 seconds), estimates the increase or decrease in individual flow rate in use based on the increase or decrease in the average flow rate, The estimated individual calculation flow rate Q of the increased / decreased instrument and the used time 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. 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. 106 is a notification means or shut-off means, which is provided with an LED for receiving a warning in response to the individual abnormality signal E or a shut-off valve for shutting off 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, if the registered individual flow rate is stopped when the flow rate changes within the normal range due to the flow control of the device itself, the value will differ from the individual flow rate at the time of registration. In some cases, the wrong registered individual flow rate may be deleted when deleting, and in this case, if the smaller registered individual flow rate is deleted and the remaining one is left, the device can be used continuously. The time will be shortened, and the gas shut-off valve will operate in a shorter time than expected and the gas supply will be stopped. If it is left will, continuous use time limit will be extended, such as when using a large instruments used flow will have a problem in safety.

  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. That is, there is a problem that monitoring different from the actual use flow rate cannot be performed to prevent erroneous interruption.

The present invention solves the above-mentioned problem, and when it is determined that the use of the instrument is stopped by detecting a change in flow rate of a predetermined value or more, an average obtained by the registered individual flow rate and the flow rate calculation means after deleting the predetermined registered individual flow rate When the flow rate value is compared and there is a difference greater than or equal to the specified value, the registered individual flow rate is corrected based on the difference data. Therefore, it is possible to provide a highly safe gas shut-off device that can be made close to the flow rate of use and that has no erroneous shut-off.

  In order to solve the above-described conventional problems, a gas shutoff device according to the present invention is obtained by a flow rate detection unit that measures a gas flow rate, a flow rate calculation unit that calculates a flow rate value from a detection value of the flow rate detection unit, and a flow rate calculation unit. Average flow rate calculation means for averaging the instantaneous flow rate values to obtain an average flow value, flow rate storage means for storing the average flow rate value obtained by the average flow rate calculation means, values obtained by the average flow rate calculation means and the flow rate storage means A flow rate change determining unit that determines that there is a flow rate change when the difference between stored values is greater than a predetermined first change value; and a flow rate registering unit that registers / deletes the flow rate change when the flow rate change determining unit determines that there is a change. The registered flow rate determination means for determining whether or not the registered flow rate after the registration flow change processing is normal, and the average flow rate value using the differential flow rate when the registered flow rate after the change processing is abnormal Close to Those having a registered flow correction unit that urchin corrected.

  According to the above invention, when the flow rate change determining means detects a flow rate change greater than or equal to a predetermined value, it judges whether to start using or stop using the device. If the use is stopped, the registered flow that is close to the flow rate change is deleted and set as the registered flow that is close to the actual use state, and the registered flow after the deletion is the registered flow corresponding to the device used. When it is determined that it is not compatible, the registered flow rate is corrected based on the differential flow rate so that it is close to the value corresponding to the device used. Even if another registered flow rate is deleted by mistake, it can be corrected to a registered flow rate that is compatible with the appliance currently in use, and an appropriate blockage function can be secured by ensuring an appropriate use restriction function for the appliance in use. It can be prevented, and can provide a high gas shutoff device safety.

  The gas shutoff device according to the present invention has a registered flow rate corresponding to the appliance used when the registered flow rate is deleted when a change in the flow rate of more than a predetermined value is detected and the use stop of the appliance is determined and the registered flow rate is deleted. When it is determined that it is not compatible, the registered flow rate is corrected based on the difference flow rate so that it is close to the value corresponding to the device used. Even if another registered flow rate is deleted by mistake, it is possible to correct it to the registered flow rate corresponding to the device currently in use, and by ensuring an appropriate use restriction function corresponding to the device used, erroneous blocking is achieved. It is possible to provide a gas barrier device that can be prevented and has high safety.

  A first invention is a gas shut-off device that monitors the usage status of a plurality of gas appliances connected to piping after passing through a gas meter, and shuts off the supply of gas when an abnormality occurs. A flow rate detecting means for measuring a flow rate, a flow rate calculating means for calculating a flow rate value from a detection value of the flow rate detecting means, and an average flow rate calculating means for averaging the instantaneous flow rate values obtained by the flow rate calculating means to obtain an average flow rate value And a flow rate storage means for storing the average flow rate value obtained by the average flow rate calculation means, and a difference between the value obtained by the average flow rate calculation means and the stored value of the flow rate storage means is greater than a predetermined first change value. The flow rate change determining means for determining that there is a change in flow rate, the flow rate registration means for registering / deleting the flow rate change when the flow rate change determining means determines that there is a change, and the process for changing the registered flow rate were performed. Registered flow rate determining means for determining whether or not the registered flow rate is normal, and registered flow rate correcting means for correcting the registered flow rate to be close to the average flow rate value using the differential flow rate when the registered flow rate after the change process is abnormal. It is characterized by having.

When the flow rate change determining means detects a flow rate change greater than or equal to a predetermined value, it determines the start of use or stop of use of the appliance. Set and delete the registered flow rate that is close to the flow rate change and set it as the registered flow rate that is close to the actual use state, and check whether the registered flow rate after deletion is the registered flow rate that corresponds to the device used. When it is determined that it is not compatible, the registered flow rate is corrected based on the differential flow rate so that it is close to the value corresponding to the device being used. Even if the registered flow rate is deleted, it can be corrected to the registered flow rate corresponding to the appliance currently in use, and an appropriate blockage function corresponding to the appliance used is secured to prevent erroneous blockage. It can, and it is possible to provide a highly safe gas cutoff apparatus.

  The second invention is a gas shut-off device that monitors the use status of a plurality of gas appliances connected to the pipe after passing through the gas meter, and shuts off the gas supply when an abnormality occurs. A flow rate detecting means for measuring a flow rate, a flow rate calculating means for calculating a flow rate value from a detection value of the flow rate detecting means, and an average flow rate calculating means for averaging the instantaneous flow rate values obtained by the flow rate calculating means to obtain an average flow rate value And a flow rate storage means for storing the average flow rate value obtained by the average flow rate calculation means, and a difference between the value obtained by the average flow rate calculation means and the stored value of the flow rate storage means is greater than a predetermined first change value. A flow rate change determination unit that determines that there is a change in flow rate, and a change direction determination unit that outputs a registration signal or a deletion signal according to the change direction when the flow rate change determination unit determines that there is a change, When the output of the change direction determination means is an increase change, a flow rate change is registered, and when the decrease change is a flow rate registration means for deleting a registered flow rate close to the flow change, and when the deletion process is performed by the flow rate registration means Subtraction processing between the value obtained by the average flow rate calculation means and the total flow value of the flow rate registration means, and when there is a predetermined difference or more, a registered flow rate determination means that outputs an abnormal signal, and an abnormality of the registered flow rate determination means A flow rate difference correction estimation unit that receives a signal and corrects a registered value of the flow rate registration unit using the differential flow rate, a monitoring value storage unit that stores a determination value for monitoring an abnormality in a use state, and a flow rate registration unit. An abnormality determination unit that determines whether or not there is an abnormality in comparison with a determination value of the monitoring value storage unit that corresponds to a flow rate value, and a blocking unit that blocks gas supply by the abnormality determination of the abnormality determination unit. And even It is.

  When the flow rate change determining means detects a flow rate change greater than or equal to a predetermined value, it determines whether the flow rate change is an increase change or a decrease change, and determines whether to start or stop using the device. Output and newly register the flow rate change and set it as the registered flow rate corresponding to the use restriction of the appliance.If the use is stopped, output the delete signal and delete the registered flow rate close to the flow rate change and put it in the actual use state Set as a close registered flow rate and determine whether or not the registered flow rate after deletion is a registered flow rate corresponding to the device used, and if it is determined not to correspond, register based on the differential flow rate calculated by the differential flow rate calculation means Since the flow rate is corrected to approach the value corresponding to the device used, even if another registered flow rate is deleted by mistake when deleting the registered flow rate when use is stopped, registration corresponding to the device currently in use It is possible to correct the registered flow rate using the differential flow rate generated by the reduction even when the reduction of the registered flow rate is performed when the usage flow rate at the time of suspension of use is reduced by combustion control etc. Therefore, it is possible to reset the registered flow rate to be close to the actual use state, and by ensuring an appropriate use restriction function corresponding to the equipment used, it is possible to prevent erroneous shut-off and a highly safe gas. A blocking device can be provided.

(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, FIG. 2 is an internal configuration diagram of the gas cutoff device, and FIG. 3 is a control block diagram of the gas cutoff device.

A gas meter 2 is installed at the entrance of the gas supply pipe 1 of each household, and the gas is branched from the gas pipe 3 after passing through the gas meter 2 to a place where various gas appliances used at home are installed. Supplied. For example, a gas water heater 4 is installed outdoors, and hot water generated by the gas 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. The floor heating 7 is supplied to form 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 meter 2, and the data is accumulated and stored every predetermined period. The data stored in the gas meter 2 is subjected to predetermined information processing based on a periodic data request command from the gas company, and then information such as gas charges, gas usage, discount services provided by the gas company, etc. To the consumer and the gas company.

  The gas meter 2 is formed with a gas flow path having a gas inlet and a gas outlet, and a pair of a shut-off valve 11 that shuts off the gas at the time of abnormality and a flow rate detection means 17 that measures the gas flow rate in the gas flow path. Ultrasonic sensors 17a and 17b are arranged. Further, a control composed of a flow rate calculation unit 19 that calculates a gas flow rate based on a signal from the flow rate detection unit 17, an average flow rate calculation unit 12 that sets the calculated instantaneous flow rate values a predetermined number of times and calculates the average flow rate value, and the like. A circuit 10 is built in and a battery 13 for driving the control circuit 10 is housed.

  There are various types of flow rate detecting means, and an ultrasonic signal is transmitted from one to the other with a pair of ultrasonic sensors installed in the flow path shown in this embodiment, and the gas flow rate used is determined from the propagation time. What to detect, one that has a hot-wire sensor in the flow path and obtains the flow rate from the impedance that changes depending on the flow, and further detects the amount of gas by the metering membrane, and the mechanical action of the metering membrane is a magnet and reed switch or magnetoresistive element In this embodiment, a gas meter using an ultrasonic sensor as the flow rate detection means will be described.

  First, the flow rate detection means 17 using the ultrasonic sensors 17a and 17b will be briefly described. A first transmitter / receiver 17A for transmitting or receiving ultrasonic waves and a second transmitter / receiver 17B for receiving or transmitting ultrasonic waves are arranged in the flow direction. The transmission / reception can be switched by the measurement controller 18 having switching means constituting the control circuit 10, and the flow state of fluid such as gas is detected. The flow rate is measured by processing the signals of the first transmitter / receiver 17A and the second transmitter / receiver 17B. Specifically, the first transmitter / receiver 17A is first driven by the measurement control unit 18 and the second transmitter / receiver 17B is then driven. The ultrasonic wave is transmitted toward the upstream, that is, from the upstream to the downstream. Then, the signal received by the second transmitter / receiver 17B is amplified by the amplifying means provided in the measurement control unit 18, the amplified signal is compared with the reference signal, and after the signal equal to or higher than the reference signal is detected, the measurement control unit The above-described transmission / reception is repeated a predetermined number of times by the repeating means provided at 18, and each time value is measured by a time measuring means such as a timer counter provided at the measurement control unit 18.

  Next, transmission / reception of the first transmitter / receiver 17A and the second transmitter / receiver 17B is switched by the measurement control unit 18 having switching means, and the ultrasonic waves are transmitted from the second transmitter / receiver 17B to the first transmitter / receiver 17A, that is, from downstream to upstream. A signal is transmitted, this transmission is repeated as described above, and each time value is measured. Then, the flow rate value is obtained by the signal processing means 19 constituting the flow rate calculation means in consideration of the size of the flow path and the fluid flow state from the ultrasonic propagation time difference between the first transceiver 17A and the second transceiver 17B. The flow rate data is obtained every predetermined cycle as an instantaneous flow rate value.

Then, the instantaneous flow rate value obtained in a predetermined cycle is input to the average flow rate calculation means 12, where a predetermined number of instantaneous flow rate values are collected and averaged to be calculated as an average flow rate value. This average flow value is stored in the flow rate storage means 14 in time series, and whether there is a change greater than a predetermined change value compared to the average flow value calculated by the average flow rate calculation means 12 by the flow rate change detection means 15. Determine whether or not to use the appliance. For example, when the customer uses the water heater 4, the flow rate value is from zero to a predetermined flow rate, or from the average flow rate obtained when the water heater 4 or the like is used while using other appliances and the past flow memory value. Whether or not the instrument is used / stopped is determined based on whether the flow rate change rate or the flow rate change amount is equal to or greater than a predetermined value.

  When a change value greater than or equal to a predetermined value is detected by the flow rate change detection means 15, it is determined that the instrument has been used or that the use of the instrument has been stopped. If the instrument has been used, the flow rate change is registered. Registered in the means 16 and set as a registered flow rate value. In this case, every time a change on the flow rate increasing side is detected, it is determined that an instrument has been additionally used, and each time the flow rate change is newly registered, it is set as a registered flow rate value. On the other hand, when the use of the instrument is stopped, the registered flow rate value close to the flow rate change is deleted from the registered flow rate values registered in the flow rate registration means 16. Similarly, in the case of 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.

  Specifically, as shown in FIG. 4, when a change signal is output from the flow rate change detection unit 15, the change direction determination unit 24 determines whether the flow rate change is an increase change or a decrease change, and further calculates a differential flow rate. The difference flow rate between the average flow rate value calculated by the average flow rate calculation unit 12 and the stored value stored in the flow rate storage unit 14 when the flow rate change detection unit 15 determines that there is a change is calculated by the unit 25, and this change direction The registration process or the deletion process of the registered flow rate value of the flow rate registration unit 16 is performed by the differential flow rate calculated by the differential flow rate calculation unit 25 in accordance with the registration signal or the deletion signal from the determination unit 24.

  When the deletion signal is output from the change direction determination unit 24 and the deletion process of the registered flow rate value is executed, the registered flow rate determination unit 20 calculates the average of the registered flow rate value after deletion and the average flow rate calculation unit 12. Compare with the flow rate value to determine whether the difference is within the predetermined range. If the difference is within the range, the deletion process has been executed normally. Therefore, it is determined that the appliances coincide with each other, and the use of the appliance is continuously monitored with the registered flow rate value as it is without correcting the registered flow rate value. Further, if the comparison result exceeds the predetermined range, it is determined that the deletion process has not been executed normally, that is, the deleted registered flow value does not match the stopped use of the device, and the differential flow shown in FIG. The calculation means 26 performs a subtraction process between the registered flow rate value after deletion and the average flow rate value to calculate a difference flow rate value. The registered flow rate value of the flow rate registering unit 16 is corrected using the differential flow rate value calculated by the differential flow rate calculating unit 26, and the flow rate is set again to be a registered flow rate corresponding to the instrument currently in use.

  Then, the appliance used is monitored with the reset registered flow rate. In this case, the device continuous use limit time corresponding to the flow rate range or the monitoring judgment value of the maximum use flow rate is stored, for example, an abnormality that occurs when the hose that supplies gas to the use device such as a stove is disconnected for some reason Monitoring with a total flow cutoff value for monitoring a large flow rate and a usage time cutoff time limit that defines a usage time limit corresponding to when the instrument is used for much longer than the maximum normal usage time A value storage means 27 is provided, and by confirming the set value and the registered flow rate value of the flow rate registration means 16 with the abnormality determination means 22, the registered flow rate value does not exceed the maximum use flow rate value, or the instrument usage time. It is possible to determine whether or not the appliance continuous use time limit corresponding to the registered flow rate value has been exceeded. When an abnormality is determined by the abnormality determining means 22, a signal is sent to the blocking means 23. It actuates the shut-off valve 11 Te to stop the supply of gas. In addition, the shut-off state and shut-off content are displayed on a liquid crystal display device and the like, and a gas monitoring center is notified through communication means.

The operation of the gas shut-off device configured as described above will be explained. When a gas appliance held in a customer's house, such as a gas stove 9 or a water heater 4, is used, its flow rate is detected by the flow rate detection means 17. To do. 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 19 to be calculated as an instantaneous flow rate value. A plurality of average flow rates calculated and obtained as average flow rate values are stored in the flow rate storage means 14 periodically and chronologically, and past flow rates stored in the flow rate storage means 14 (for example, the previous flow rate) Alternatively, the presence or absence of a flow rate change is obtained from the previous time or the flow rate memory value n times before). That is, using the average flow rate value output at a predetermined interval, it is determined whether the appliance is used or the appliance is stopped 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 deleting a registered flow rate that has already been registered, it is possible to accurately set a registered flow rate that corresponds to the appliance used at the time of change.

  For example, when the user uses the water heater 4, when the past flow rate is zero, the flow rate changes to an arbitrary flow rate, but the change is obtained as a change flow rate from the average flow rate and the past flow rate, and the change rate or change amount is equal to or greater than a predetermined value. In this case, it is registered in the flow rate registration means 16 as having a change, that is, having some appliance used. 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 storage means 14, and the flow rate change detection means 15 changes from the current average flow rate and the past flow rate stored value. The 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 16 when there is a change when the change flow rate is greater than or equal to a predetermined value. Not only when the appliance usage increases, but when any appliance is stopped while a plurality of appliances are in use or the flow rate changes, the flow rate change detection means 15 determines whether the change has decreased from the past flow rate stored value and the average flow rate. The decrease change flow rate is output, and the flow rate registration means 16 deletes or reduces the closest flow rate registration value among the flow rates registered from the decrease change flow rate.

  However, when the hot water heater 4 is used, particularly when it is used for floor heating or the like, the amount of combustion varies greatly when the initial load is large and when the stable load is small. In such a case, it is determined that there is a change in the flow rate at the beginning of operation, and the use of the water heater 4 is determined, and the average flow rate value at this time is registered in the flow rate registration means 16 as a registered flow rate. When the operation is continued, the heating load is gradually decreased, and the combustion amount, that is, the gas flow rate is controlled in the decreasing direction by the proportional control. Since the amount of change at this time changes by an amount smaller than the determination value set by the flow rate change detecting means 15, only the average flow value is gradually reduced without making a determination that there is a change in flow rate. The registered flow rate value registered in (1) is held in the state as initially set.

  In other words, the difference between the registered flow rate value and the average flow rate value greatly spreads over time. When the heating load is saturated and the water heater 4 stops in this state, the flow rate change detecting means 15 determines that the flow rate has changed. Thus, the flow rate change at this time is deleted from the registered flow rate registered in the flow rate registration means 16. However, since the average flow rate value when the water heater 4 stops is considerably reduced by the proportional control, the flow rate change is also reduced compared to the initial value, and this reduced flow rate change is used as the registered flow rate. Even if the registered flow rate is deleted, a certain value remains as the registered flow rate, and the remaining registered flow rate of the appliance that is not actually used is compared with the set value of the monitoring value storage unit 27 by the abnormality determination unit 22. It becomes the target of the registered flow rate. In other words, the device to be used is monitored at a registered flow rate that is larger than the registered flow rate of the device that is actually used, the continuous use time limit is shortened, and the shut-off valve 11 can be shortened in an unexpectedly short time. Will cause a malfunction that will be interrupted.

  Therefore, in the present invention, when the registered flow rate is deleted, the registered flow rate determination means 20 compares the deleted flow rate value with the average flow rate value, and determines whether or not the difference is within a predetermined range. Determine whether the deletion process of the registered flow rate has been executed normally. If it is within the specified range, determine that the deletion process has been executed normally and keep the registered flow rate as it is, and continue monitoring the use of the device. To do. When the predetermined range is exceeded, the deletion process is not executed normally, and it is determined that a problem has occurred as described above, and a signal is sent to the differential flow rate calculation means 26 to calculate the total of the registered flow rate values after deletion. A difference flow rate value from the average flow rate value calculated by the average flow rate calculation means 12 is calculated.

  Next, this differential flow rate value data is sent to the registered flow rate correcting means 21, and the registered flow rate registered in the flow rate registering means 16 is corrected by this registered flow rate correcting means 21, and the registered flow rate corresponding to the instrument currently in use. Set to.

  The equipment used is monitored with the reset registration flow rate, and when an abnormality occurs, the shutoff valve 11 is operated to stop the gas supply to ensure safety.

  The correction process by the registered flow rate correcting unit 21 is performed when the comparison result between the registered flow rate value after deletion and the average flow rate value in the registered flow rate determining unit 20 is in the relationship of the registered flow rate value after deletion> average flow rate value. As described above, in the relationship of the registered flow rate value after deletion <average flow rate value, it is determined that there is a slight increase, and the difference is output to the flow rate registration means 16 and registered, so that the registered flow rate corresponding to the appliance state currently in use can be obtained. I try to secure it.

  Next, the above correction operation will be described in more detail with reference to FIG. 5. The vertical axis indicates the flow rate of use (l / h), the horizontal axis indicates the progress of use, and represents the usage form of the instrument. At point A, for example, a gas stove is used and the usage flow rate changes from 0 (l / h) to 40 (l / h). At point B, the water heater starts to operate, for example, to use floor heating. From 40 (l / h) to 160 (l / h), the combustion amount of the water heater is controlled by proportional control as the heating load changes, and the flow rate used is gradually reduced to 100 (l / h). This represents a state in which the combustion of the water heater is stopped at the point C which has been reduced until the usage flow rate is reduced to 40 (l / h).

  Explaining the operation of the control circuit 10 which is an instrument monitoring function in this usage pattern, the detection of the used gas flow rate is obtained as an instantaneous flow rate value by the flow rate detection means 17 and the flow rate calculation means 19, and the instantaneous flow rate value is determined by a predetermined number or Aggregated for a predetermined time and averaged, calculated as an average flow rate value at timings a, b, c... A ′, b ′, c ′, d ′ and stored in the flow rate storage means 14.

  Then, the average flow rate value 40 (l / h) obtained at timing c at point A and the average flow rate value 0 (l / h) at timing b stored in the flow rate storage means 14 are compared by the flow rate change detection means 15. In the comparison result, if the differential flow rate is a predetermined value, for example, 10 (l / h) or more, it is determined that the instrument has been used or stopped as “changed”, and a signal is sent to the change direction determination means 24, Here, it is determined whether the change is increasing or decreasing. In the case of the usage pattern shown in FIG. 5, it is determined that the instrument has been used because it has increased from 0 (l / h) to 40 (l / h), and the differential flow rate calculation means 25 determines the differential flow rate 40 (l / h). h) is calculated. This differential flow rate 40 (l / h) is newly registered as a registered flow rate value in the flow rate registration means 16, and the use restriction of the gas appliance is monitored with this registered flow rate value until a change occurs thereafter. In the usage mode of FIG. 5, since there is no change in the average flow rate value from timing c to timing k, the registered flow rate value remains the differential flow rate 40 (l / h) registered at the initial stage.

  Then, the average flow rate value 160 (l / h) obtained at the timing l at the point B and the average flow rate value 40 (l / h) at the timing k stored in the flow rate storage unit 14 are compared by the flow rate change detection unit 15. In the comparison result, since the differential flow rate 120 (l / h) is a predetermined value, for example, 10 (l / h) or more, it is determined that the instrument has been used or stopped as “changed”, and the change direction determination means 24 A signal is sent to determine whether the change is increasing or decreasing. Since the flow rate change at point B increases from 40 (l / h) to 160 (l / h), it is determined that the instrument is used, and the differential flow rate calculation means 25 sets the differential flow rate 120 (l / h). calculate. This differential flow rate 120 (l / h) is newly registered in the flow rate registration means 16 as a registered flow rate value.

  And the use restriction | limiting of a gas appliance is monitored by the total value 160 (l / h) of the last registration flow value 40 (l / h) and this registration flow value 120 (l / h).

  Then, the gas flow rate is controlled by proportional control or the like from timing p after timing B to timing c ′, and the usage flow rate gradually decreases with a small change amount, but the average flow rate value at timing p is 156 (l / h). Even if the average flow rate value 160 (l / h) at the timing o stored in the flow rate storage unit 14 and the flow rate change detection unit 15 are compared, the change is smaller than the predetermined comparison reference value 10 (l / h). “None” is determined, and the process of changing the registered flow rate value is not performed. Further, since the average flow rate value at the timing q also changes by the same proportional control, it becomes 152 (l / h), and the differential flow rate from the average flow value 156 (l / h) at the timing p stored in the flow rate storage means 14 is 4 (l / h), and even if the flow rate change detection means 15 compares, it is determined that there is no change, and the registered flow rate value is not changed.

  In this way, the determination result in the flow rate change detection means 15 is “no change” until the timing c ′ at which the change is small, so that the registered flow rate value is not changed, and the differential flow rate value registered at point B is not processed. 120 (l / h) is held as the registered flow rate value.

  However, the average flow rate value at the timing c ′ is 100 (l / h), and the differential flow rate value is 60 (l / h), which should be set as the registered flow rate value in accordance with the actual use state. It is an object of the present invention to reduce the difference between 120 (l / h) and 60 (l / h) as close as possible to a registered flow rate value in accordance with the actual use state.

  Therefore, the average flow rate value 40 (l / h) obtained at the timing d ′ at the point C and the average flow rate value 100 (l / h) at the timing c ′ stored in the flow rate storage unit 14 are the flow rate change detection unit 15. In the comparison result, the difference flow rate 60 (l / h) is equal to or greater than a predetermined value, for example, 10 (l / h). A signal is sent to 24, where it is determined whether the change is increasing or decreasing. Since the change in flow rate at point C decreases from 100 (l / h) to 40 (l / h), it is determined that the use of the instrument has been stopped, and the differential flow rate calculation means 25 uses the differential flow rate 60 (l / h). ) Is calculated.

  Since this differential flow rate 60 (l / h) is a decreasing change, of the registered flow rates 40 (l / h) and 120 (l / h) registered in the current flow rate registration means 16, the differential flow rate 60 (l / H) A registered flow value larger than and close to the registered flow value, which is 120 (l / h) in this embodiment, is deleted. As a result of this deletion processing, 40 (l / h) and 60 (l / h) are registered as the registered flow values registered in the flow rate registration means 16, and 100 (l / h) is present as the total value of the remaining registered flow values. Will do.

  Here, the registered flow rate determination means 20 compares the total value 100 (l / h) of the registered flow rate values after the deletion process with the average flow rate value 40 (l / h) obtained at the timing d ′, and the difference flow rate. Is within a predetermined range, for example, within 5% of the average flow rate value, and if the differential flow rate exceeds the range, it is determined as abnormal. In the case of the present embodiment, the differential flow rate is 60 (l / h), which exceeds 5% of the average flow rate value 40 (l / h), that is, exceeds 2 (l / h). 26, a differential flow rate 60 (l / h) is calculated.

Then, the registered flow rate correction unit 21 corrects the registered flow rate value after the deletion process with the differential flow rate 60 (l / h) calculated by the differential flow rate calculation unit 26. In this case, there are 40 (l / h) and 60 (l / h) as registered flow values, and among these registered flow values, a registered flow value that is larger than the differential flow rate as described above and close to the registered flow value. In the case of the present embodiment, the registered flow rate value 60 (l / h) is targeted, and this registered flow rate value 60 (l / h) is used as the differential flow rate 60 (l / h).
When the correction, that is, the subtraction process is executed in h), 40 (l / h) remains as the registered flow rate value, which matches the average flow rate value 40 (l / h) obtained at timing d ′. The registered flow rate value can be brought close to the use state.

  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 flow rate change determination means 15 detects a flow rate change of a predetermined value or more, it judges whether to start using or stop using the device, and in the case of starting use, it registers the flow rate change to deal with the use limit of the device. If the use is stopped, the registered flow that is close to the flow rate change is deleted and set as the registered flow that is close to the actual use state, and the registered flow after the deletion is the registered flow corresponding to the device used. When it is determined that it is not compatible, the registered flow rate is corrected based on the differential flow rate so that it is close to the value corresponding to the device used. Even if another registered flow rate is deleted by mistake, it can be corrected to a registered flow rate that is compatible with the appliance currently in use, and an appropriate blockage function can be secured by ensuring an appropriate use restriction function for the appliance in use. It can be prevented, and it is possible to provide a high gas shutoff device safety.

  Further, as a specific means, it is determined whether or not the registered flow rate after deletion is a registered flow rate corresponding to the device to be used, and when it is determined that the registered flow rate is not corresponding, the registered flow rate is calculated based on the differential flow rate calculated by the differential flow rate calculation unit. Is corrected so as to be close to the value corresponding to the device used, and the registered flow rate can be accurately corrected when the registered flow rate is monitored for each device used.

  As described above, the gas shut-off device according to the present invention can appropriately secure the use restriction function of the appliance in which the amount of gas used changes, and can be applied to all appliance monitoring devices.

The figure which shows the installation form of the gas interruption | blocking apparatus and gas appliance in Embodiment 1 of this invention Internal configuration diagram of the gas shutoff device Control block diagram of the gas shutoff device Another control block diagram of the gas shutoff device The figure explaining the registration flow correction operation of the gas cutoff device Control block diagram of a conventional gas shut-off device

Explanation of symbols

2 Gas meter 11 Gas shutoff valve 12 Average flow rate calculation means 14 Flow rate storage means 15 Flow rate change detection means 16 Flow rate registration means 17 Flow rate detection means 19 Flow rate calculation means 20 Registered flow rate determination means 21 Registered flow rate correction means 22 Abnormality determination means 23 Shutdown means 24 Change direction determination means 25, 26 Differential flow rate calculation means

Claims (2)

A gas shut-off device that monitors the usage status of a plurality of gas appliances connected to piping after passing through a gas meter, and shuts off the gas supply when an abnormality occurs,
The gas meter includes a flow rate detection unit for measuring a gas flow rate, a flow rate calculation unit for calculating a flow rate value from a detection value of the flow rate detection unit, and an average flow rate value obtained by averaging the instantaneous flow rate values obtained by the flow rate calculation unit. The average flow rate calculation means to be obtained, the flow rate storage means for storing the average flow rate value obtained by the average flow rate calculation means, and the difference between the value obtained by the average flow rate calculation means and the storage value of the flow rate storage means is determined in advance. A flow rate change determining unit that determines that there is a flow rate change when greater than one change value, a flow rate registration unit that registers / deletes a flow rate change when the flow rate change determining unit determines that there is a change, and a process of changing the registered flow rate are performed. Registered flow rate determination means for determining whether or not the registered flow rate after normal operation is normal, and when there is an abnormality in the registered flow rate after the change process, the registered flow rate is corrected so as to approach the average flow rate value using the differential flow rate. Gas cutoff apparatus provided with a flow correcting device. A gas shut-off device that monitors the usage status of a plurality of gas appliances connected to piping after passing through a gas meter, and shuts off the gas supply when an abnormality occurs,
The gas meter includes a flow rate detection unit for measuring a gas flow rate, a flow rate calculation unit for calculating a flow rate value from a detection value of the flow rate detection unit, and an average flow rate value obtained by averaging the instantaneous flow rate values obtained by the flow rate calculation unit. The average flow rate calculation means to be obtained, the flow rate storage means for storing the average flow rate value obtained by the average flow rate calculation means, and the difference between the value obtained by the average flow rate calculation means and the storage value of the flow rate storage means is determined in advance. A flow rate change determination unit that determines that there is a flow rate change when greater than one change value, a change direction determination unit that outputs a registration signal or a deletion signal according to the change direction when the flow rate change determination unit determines that there is a change, and When the output of the change direction determination unit is an increase change, a flow rate change is registered, and when the output is a decrease change, a flow rate registration unit that deletes a registered flow rate close to the flow rate change, and a deletion process by the flow rate registration unit A registration flow rate determination unit that performs subtraction processing between the value obtained by the average flow rate calculation unit and the total flow rate value of the flow rate registration unit and outputs an abnormal signal when there is a difference greater than or equal to a predetermined value; A flow rate difference correction estimation unit that receives an abnormality signal of the determination unit and corrects a registered value of the flow rate registration unit using the differential flow rate; a monitoring value storage unit that stores a determination value for monitoring an abnormality in use state; Comparing with a judgment value of the monitoring value storage means corresponding to the flow rate value of the flow rate registration means, an abnormality judgment means for judging the presence or absence of an abnormality, and a shutoff means for shutting off the gas supply by the abnormality judgment of the abnormality judgment means. Gas shut-off device.