JP2009052755A - Gas shut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shut off gas by sequentially calculating change of a differential value of instantaneous flow rate output from a flow rate measuring means, determining the amount of the change and a predetermined flow rate pattern, setting the optimal value of continuing using time based on the time from starting to a control phenomenon and integration flow of control phenomenon intervals and gas flow rate, and warning at the time when the continuing using time passed. <P>SOLUTION: A gas shut-off device connected to a household gas supply pipe comprises a gas shut-off valve 2, a communication means 9, the flow rate measuring means 3 for measuring the gas flow rate at constant time intervals, a calculation means 6 for obtaining a flow rate value, a storage means 7 for storing a comparison determination value of an instrument, a distinction means 8 for distinguishing and detecting operations of start, control, and stop of the gas instrument to be used, a control interval measuring means 11 for measuring the time from the starting phenomenon to the control phenomenon and the time from the control phenomenon to the next control phenomenon, a continuing time setting means 12 for calculating the continuing time corresponding to the control interval, and a continuing time counting means 13 for counting the continuing time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas shut-off device that discriminates the type of gas appliance connected to a gas pipe flow path and performs the flow rate measurement for each appliance and the security process for each appliance.

  In recent years, CO poisoning accidents due to gas appliances not equipped with safety devices have attracted attention, and gas appliances used indoors are frequently alerted for ventilation every predetermined time (for example, every hour). It is coming.

  On the other hand, houses with high airtightness and high thermal insulation are attracting attention because of their energy saving intentions. For example, double-glazed windows have been adopted in wooden houses other than condominiums. In the case of a highly airtight house, attention has also been paid to indoor ventilation methods such as a slit-like natural ventilation device embedded in a wall.

  Also, in gas shut-off devices, studies have been made to identify appliances based on gas flow rates, and improvements in safety functions have been demanded.

In general, a gas explosion does not occur even if the gas concentration is too high or too low, and it is called an explosion range that requires a mixture of an appropriate gas concentration and an appropriate air concentration. It depends on the species. Here, it is obvious that the amount of gas calculated from the ratio of the gas volume in the air varies depending on the size of the room and the airtightness.
Therefore, if the gas can be shut off before reaching the explosion range, a gas explosion accident can be prevented.

  FIG. 11 is a diagram illustrating an example of a conventional continuous use safety time for each gas consumption. Conventionally, as shown in the table of FIG. 11, this type of gas shut-off device has previously stored safe use time for each gas flow rate classification in order to prevent explosion accidents and CO poisoning due to unburned gas. When the duration of use without fluctuations in the total gas amount exceeds the continuous use safety time corresponding to the maximum flow rate device among the devices that make up the total gas amount And it has a function to cut off the gas flow.

  In addition, as shown in FIG. 12, this type of gas shut-off device includes a gas flow rate measuring unit 18 that measures the flow rate of gas flowing through the gas flow path, a flow rate increase detecting unit 19 that detects an increase in the flow rate from the measurement result, A flow rate increase / decrease detecting means 20 for detecting an instantaneous increase / decrease change of the gas flow accompanying the increase of the flow rate, an instrument determining means 21 for determining the start of use of a new gas combustion instrument when the instantaneous increase / decrease change is detected, and the flow rate increase detecting means. Flow rate registration means 22 is provided for registering the detected increase in the gas flow rate as an increase in the gas flow rate associated with the start of use of the new gas combustion appliance (see, for example, Patent Document 1).

With the above configuration, pay attention to the fact that the gas flow rate increases and decreases instantly when it starts to use a new gas combustion device, and it becomes a stable gas flow rate. By determining, the start of use of a new gas combustion appliance can be determined by a simple method, and stop of use can be determined based on a decrease in the flow rate.
JP 2002-174542 A

  However, in the conventional configuration, the use stop of the new gas combustion appliance is determined based on the decrease change of the gas flow rate corresponding to the increase of the gas flow rate with the start of use. If it is detected, there is a case where it is used for a long time without ventilation for a predetermined time, and even if a gas leak occurs for some reason during use, the gas will not be shut off until the existing shutoff time has elapsed. ing.

  Originally, it should be possible to set the shut-off time depending on the size of the room where the equipment is used and the conditions related to airtightness, but it is very difficult to determine the conditions related to airtightness even if the equipment can be identified from the gas flow rate. There was a problem.

  The present invention solves the above-mentioned conventional problems, and detects the control pattern of a change (increase and decrease) in a predetermined amount of gas flow rate after detecting the activation of the instrument, the interval at which the control pattern occurs, It is an object of the present invention to provide a technique for measuring the integrated flow rate of gas, calculating the amount of heat used, and setting the duration according to the calculated amount of heat.

  In order to solve the conventional problems, a gas shutoff valve connected to a household gas supply pipe, a communication means capable of communicating with the outside, a flow rate measuring means for measuring a gas flow rate at a constant time interval, and the flow rate Calculated by the calculating means for calculating the difference value of the flow rate output from the measuring means, the storage means for storing the flow difference pattern and the comparison determination value for determining the starting amount, the control amount, and the stopping amount of the appliance, and the calculating means. By comparing the difference value with the flow rate difference pattern or comparison determination value registered in the storage means, and determining and detecting the activation, control, and stop operation of the gas appliance to be used, and the determination means The control interval measuring means for measuring the time from the start event to the control event, the time from the control event to the control event, and the control interval measured by the control interval measuring means every time the control event of the appliance is judged A duration setting means for calculating a corresponding duration, and a duration counting means for counting the duration set by the duration setting means, and when the previous period counting means has counted a predetermined duration Thus, the communication means communicates with the outside and has a function of shutting off the gas cutoff valve.

  After detecting the activation of the instrument, the flow rate measuring device of the present invention detects a control pattern of a change (increase and decrease) in a predetermined amount of the gas flow rate, an interval at which the control pattern is generated, and an integrated gas flow rate therebetween. Measure the amount of heat used, set the duration according to the control interval and the calculated amount of heat, alarm when the set duration is counted, shut off the gas, long time Gas leakage due to use and CO poisoning accidents can be prevented in advance, and safety can be improved.

  The first invention is used with a flow rate measuring means for measuring a gas flow rate at regular time intervals, a calculation means for obtaining a flow value output from the flow rate measuring means, and a storage means for storing a comparison judgment value of the instrument. A discriminating means for discriminating and detecting the operating status of the gas appliance, a control interval measuring means for measuring an interval time in an appliance operating event by the discriminating means, and a duration corresponding to the control interval measured by the control interval measuring means. A duration setting means for calculating, and a duration counting means for counting the duration set by the duration setting means, and when the previous period counting means counts a predetermined duration, the gas cutoff valve is It is a thing to cut off.

  And when the control interval is short, a short duration can be set, and when the control interval is long, a long duration can be set, so that gas can be shut off for a predetermined duration while considering convenience, and safety is improved. be able to.

  The second invention is a gas shutoff valve connected to a household gas supply pipe, a communication means capable of communicating with the outside, a flow rate measuring means for measuring a gas flow rate at a constant time interval, and an output from the flow rate measuring means A calculation means for obtaining a difference value of the flow rate to be performed, a storage means for storing a flow difference pattern and a comparison determination value for determining an activation amount, a control amount, and a stop amount of the appliance, a difference value calculated by the calculation means, and the A discrimination means for comparing the magnitude of the flow rate difference pattern and the comparison judgment value registered in the storage means and discriminating and detecting the activation, control, and stop operation of the gas appliance to be used, and a control event of the appliance by the discrimination means Each time is determined, the time from the start event to the control event, the control interval measuring means for measuring the time from the control event to the control event, and the duration according to the control interval measured by the control interval measuring means, A continuation time setting means for outputting and a continuation time counting means for counting the continuation time set by the continuation time setting means, and when the previous continuation time counting means counts a predetermined continuation time, the communication means Communicates with the outside and shuts off the gas shut-off valve.

  3rd invention has the control amount measurement means which measures the integrated flow from a starting event to a control event, and the integrated flow from a control event to a control event, whenever it judges the control event of an instrument by the said discrimination means. The duration setting means calculates the amount of heat consumed from the integrated flow rate and the integrated time, and is set according to a pre-registered heat amount level.

  A short duration can be set when the amount of heat calculated is small and the amount of heat calculated is small, and a long duration can be set when the amount of heat calculated is a large amount of integrated flow. Gas can be shut off and safety can be improved.

  According to a fourth aspect of the present invention, the duration setting means has a function that can be set and changed from the outside, which is set in accordance with an airtightness level registered in advance.

  And the continuation time which considered the user's convenience and safety can be set individually from the outside, and safety can be improved.

  According to a fifth aspect of the invention, in particular, the determination means includes history data holding means for storing history data that has reached an alarm or shut-off such as an instrument determination result, a control interval, an integrated amount of gas flow rate, a duration, and the like. The communication means communicates with the passage of time and the history data of the history data holding means together.

  And, for example, it is possible to send alarms due to continuous use of appliances to the management center using the public line and history data that led to the alarms. It is possible to inform the user of the gas flow rate and usage time that led to the alarm, and the safety function can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a block diagram of a gas meter as a gas shut-off device in the first embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a gas meter device, which is provided in the middle of a gas supply pipe, and one or more gas appliances installed in each customer's house are connected to the downstream pipe.

In FIG. 1, the gas meter device 1 includes a flow rate measuring means 3, an arithmetic means 6, a discriminating means 8, a storage means 7, a control means 10, a display unit 4, a seismic device 5, a gas shut-off valve 2, and a communication means 9. Configured. The flow rate measuring means 3 is connected in the path of the gas supply pipe a and, as will be described later, obtains a propagation time difference caused by the gas flow in the gas supply pipe a by using an ultrasonic signal, and detects an instantaneous gas flow rate. Is. The calculation means 6 performs various calculations related to the flow characteristics for instrument discrimination described later, such as calculating the gas flow rate by integrating the instantaneous flow rate based on the detected instantaneous flow rate, and calculating the flow rate difference value. It is. The flow rate measurement means 3 and the calculation means 6 realize the function of the flow rate measurement unit.

  The discriminating means 8 discriminates the flow rate characteristic of the gas flow rate such as the flow rate value, the flow rate change amount, and the change time based on the stored judgment value for each instrument based on the calculated flow rate value and the flow rate difference value, The specific gas appliance used when a gas is flowing through a is determined.

  The control means 10 has a function of an appliance corresponding processing section. In addition to the operation control of each part in the gas meter device 1, a security process such as a warning or a gas cutoff based on a specific result of the gas appliance by the discrimination means 8, A device identification result report, device identification information update processing, and the like are performed. The storage unit 7 includes appliance discrimination information such as a judgment value used for discrimination of a specific appliance, instantaneous flow rate value information measured by the flow rate measurement unit 3, gas flow rate value information and flow rate difference value information calculated by the calculation unit 6, and the like. Various information used in the gas meter device 1 such as the flow rate information and the history information of the appliances used and the usage status are stored. Here, the control means 10, the calculation means 6, and the discrimination means 8 are constituted by a processor and an operation program that constitute a microcomputer (microcomputer) or the like, and by executing a predetermined operation program in the processor and performing corresponding processing. Each function is realized. The storage unit 7 is configured by a memory such as a flash ROM or a RAM.

  The storage means 7 records comparison determination values for determining the occurrence of flow rate changes such as activation, control, and stop, and records the results of appliance discrimination, and is configured by, for example, a flash ROM, RAM, or the like. .

  The storage means uses a semiconductor memory in the present invention, but may be a magnetic recording medium, a non-volatile memory, or the like as long as recording can be added or rewritten.

  In addition, regarding the flow rate measuring means 3 of the present invention, an ultrasonic type measuring means is used. However, as a measuring method, other flow rate measuring methods can be continuously measured in a constant cycle in a short time such as a fluidic method. If it is.

  The display unit 4 includes an LED, a liquid crystal display, and the like, and displays a gas flow rate, an operating state of the gas appliance, a warning, and the like. The seismoscope 5 detects vibration such as an earthquake and outputs a detection signal to the control means 10. The gas shut-off valve 2 is connected in the path of the gas supply pipe a, and shuts off the gas supply by closing the gas supply pipe a based on an instruction from the control means 10.

  The communication means 9 has a wired or wireless communication function and is connected to a management center (not shown) via a public line, for example. The communication means 9 transmits various information, commands, and signals to the management center such as transmitting an information request signal for requesting appliance discrimination information to the management center and receiving a signal including appliance discrimination information from the management center. It is exchanged between the two.

The management center is configured with a computer and the like, and realizes the function of the management unit. When there is a new instrument information addition or instrument information change every predetermined period, a request is received from the gas meter device 1. When there is a signal, the signal including the instrument discrimination information is transmitted to the gas meter device 1. This management center includes a processor and an operation program that constitute a computer or the like, and each function is realized by executing a predetermined operation program and performing a corresponding process in the processor.

  The operations of the flow rate measuring means 3 and the calculating means 6 will be described in detail. FIG. 2 is a configuration diagram showing a schematic configuration of the flow rate measuring means 3.

  The flow rate measuring means 3 has a measurement flow path 32 having a rectangular cross section communicating with the gas supply pipe a, and a pair of ultrasonic waves is provided on the upstream side and the downstream side of the flow path walls facing each other. Transceivers 33 and 34 are arranged. These ultrasonic transmitters / receivers 33 and 34 are set so that the ultrasonic propagation path obliquely crosses the gas flow flowing through the measurement flow path 32, and the ultrasonic flow is alternately transmitted / received, so that the ultrasonic flow is sequentially transmitted and received. Propagation of ultrasonic waves in the opposite direction.

  At this time, the distance between the ultrasonic transceivers 33 and 34, that is, the measurement distance is L, the angle of the ultrasonic propagation path with respect to the gas flow is φ, and the ultrasonic propagation time from the upstream to the downstream of the ultrasonic transceivers 33 and 34 is If t1, the ultrasonic propagation time from downstream to upstream is t2, and the sound velocity is C, the flow velocity V can be obtained by the following equation.

V = L / 2 cos φ ((1 / t1) − (1 / t2)) (1)
The instantaneous flow rate of the gas flow is calculated from the flow velocity V and the cross-sectional area of the measurement channel 32.

  The time interval for measuring the instantaneous flow rate can be set within a range where ultrasonic waves can be transmitted and received. Since the time to change by activation and control varies depending on the gas appliance, reducing the measurement time interval is advantageous in terms of instantaneous instrument discrimination, but shortening the measurement time interval increases battery consumption. . Moreover, when the measurement time interval is a two-digit order interval equivalent to the membrane type used in the conventional gas meter, it becomes difficult to judge by looking at the difference in flow rate change. Therefore, in this embodiment, when the gas appliance is not used, the periodic instantaneous flow rate is measured at intervals of 2 seconds, and the difference value is taken to determine the activation of the gas appliance. The measurement time interval can be further shortened. For example, after starting the gas appliance, control such as shortening the measurement time interval may be performed in order to increase measurement accuracy.

  Next, the operation of the determination unit 8 will be described in detail. 6 is a characteristic diagram showing a change in gas flow rate when the gas appliance is used, and FIG. 7 is a characteristic diagram showing a change in difference value of the gas flow rate when the gas appliance is used.

  FIG. 6 shows the instantaneous flow rate value of the gas measured by the flow rate measuring means 3, and FIG. 7 shows the differential value at that time, that is, the difference value for each predetermined measurement time interval. The difference value is expressed with a peak on the plus side when the gas appliance is started, and is expressed with a peak on the minus side when the gas appliance is stopped. Here, when the change in the difference value is equal to or greater than a predetermined value (comparison determination value), it is possible to determine the determination of the instrument and the change in state based on the change in the gas flow rate.

  For example, instruments such as a gas stove, a gas fan heater, and a gas water heater can be identified. The gas stove has a single function for cooking and the fan heater has a single function such as for hot air heating, but the gas water heater has two functions for hot water supply and floor heating. In the floor heating, a heat medium flow path is formed on the back side of the floor, and the heat medium flowing therethrough is heated with hot water boiled by a gas water heater. And for hot water supply and floor heating, the start-up or control pattern is different, and naturally there is a difference in the change amount and change time of the difference value. Therefore, when the gas appliance is a gas water heater, it can be determined whether it is for hot water supply or floor heating, based on the number of times the difference value is continuously generated or the continuous generation time. Note that the difference value may be a negative difference at the time of stopping or ending the control as well as at the time of starting or controlling.

  The discriminating means 8 stores in advance in the storage means 7 when the gas appliance is started based on the instantaneous flow rate detected by the flow rate measuring means 3 every predetermined time and the difference value between the instantaneous flow rates calculated by the calculating means 6. The flow rate value, the flow rate change amount and the change time are determined using the appliance discrimination information, and a specific gas appliance is discriminated. In addition, it is also possible to specify the appliance using history information on the usage status of the gas appliance.

  FIG. 8 is a diagram showing an example of appliance discrimination information in the present embodiment. As appliance discrimination information, for example, for each appliance such as appliance A and appliance B, appliance ID, appliance type (gas water heater, floor heating heat source machine, bathroom heater, bathroom dryer, bath water heater, No. 5 water heater, etc. , Gas fan heater, gas FF hot air heater, gas stove, gas table (stove), gas oven, gas cooker, etc.), equipment manufacturer, product number, etc. are assigned specific equipment information, for each specific equipment Corresponding flow rate characteristic information such as flow rate characteristic A (rising flow rate transition), flow rate characteristic B (stable flow rate), flow rate characteristic C (control flow rate transition) is stored in association with each other.

  The appliance discriminating information is stored and registered in the storage means 7 in relation to the gas appliances that have been shipped so far, such as when the gas meter is shipped in the gas meter device 1. In addition, information related to a corresponding type of gas appliance may be set when the gas appliance is installed at the user's home. In addition, when new instrument information is added or instrument information is changed every predetermined period, or when there is a request from the gas meter apparatus 1, instrument discrimination information is sent from the management center (not shown) to the gas meter apparatus 1. It is also possible to set by communication by transmitting to the communication means 9. The appliance discrimination information may be held in the management center and transferred to the gas meter device 1 only when necessary to identify the gas appliance.

  FIG. 9 is a flowchart showing the operation procedure of the gas appliance discrimination system of the present embodiment. First, the instantaneous flow rate is measured at predetermined measurement time intervals by the flow rate measuring means 3 and the calculating means 6, and the integrated value and the difference value of the instantaneous flow rate are calculated (step S1). And it is determined by the control means 10 whether it is a timing which discriminate | determines a specific instrument (step S2). Here, if it is not the appliance discrimination timing, the flow measurement processing is performed again after returning to the original processing. When it is the instrument discrimination timing in step S2, the discrimination means 8 refers to the appliance discrimination information (step S3). Based on the calculated instantaneous flow rate value and the difference value, the flow rate change characteristic according to the flow rate change amount and change time, or the flow rate value at the time of stability, etc. A gas appliance is discriminated (step S4).

  FIG. 10 is a diagram illustrating an example of timing for discriminating a specific gas appliance in the gas flow rate change characteristic. As shown in FIG. 10, the appliance is specified by the flow characteristic of the rising flow rate transition at the timing ta when the gas appliance is started, or the appliance is specified by the flow characteristic of the stable flow rate at the timing tb at the stable operation of the gas appliance. Or, at the timing tc when controlling the output adjustment of the gas appliance, the gas appliance is specified at a predetermined appliance discrimination timing, such as specifying the appliance based on the flow rate characteristic of the control flow rate transition. At this time, when a specific gas appliance is determined, the determination accuracy can be improved by using a plurality of flow characteristics such as a rising flow rate transition and a stable flow rate to determine the combination by a plurality of determination conditions.

  Next, the control means 10 performs an appliance handling process corresponding to a specific gas appliance according to the appliance identification result identified by the discrimination means 8 (step S5). As the appliance handling processing, reporting of the appliance identification result, warning as security processing, cutoff of gas supply, and the like are executed. When performing the security process, various processes and combinations thereof such as an automatic return confirmation function for performing a warning, blocking after performing a warning, blocking, and restoring again after the blocking can be considered. When giving a warning, the user may notify the landline or mobile phone registered by the user of a shutoff or shutoff notice, or report to a management center (not shown) that manages the gas supply path. Is possible.

  When a warning is given, a warning instruction signal is sent from the control means 10 to the display unit 4, and in response to the warning instruction signal, the display unit 4 turns on an LED or displays characters or pictures on a liquid crystal display. Is notified. Moreover, you may warn using a sound etc. When shutting off, a shutoff instruction signal is sent from the control means 10 to the gas shutoff valve 2, and in response to this shutoff instruction signal, the gas shutoff valve 2 is driven to close the gas supply pipe a and shut off the gas supply. To do.

  Further, when reporting the gas appliance identification result, the control means 10 transmits the appliance identification result information from the communication means 9 and notifies the management center (not shown) via, for example, a public line. The management center performs management processing for a specific gas appliance based on the appliance identification result. For example, the appliance identification result can be used for various purposes, such as taking measures such as notification regarding services such as maintenance and sales for a user who uses a specific gas appliance.

  In addition, the management center (not shown) communicates the instrument discrimination information every predetermined period when new instrument information is added or instrument information is changed, or when there is a request from the gas meter device 1. 9 to the gas meter device 1. The control means 10 of the gas meter device 1 stores the received new appliance discrimination information in the storage means 7 and updates the setting of the appliance discrimination information. Thus, by appropriately updating the appliance discrimination information, it is possible to always and accurately specify the gas appliance.

  As described above, according to the present embodiment, it is possible to calculate the flow rate change amount and change time of the gas flow rate in the flow rate measuring means 3 and the calculation means 6 and to specify the type of the gas appliance in the discrimination means 8. Become. Using this appliance identification result, it can be used for various purposes, such as performing security processing such as warning and shut-off, setting gas charges, maintenance, sales, etc. for specific gas appliances. It is possible to manage gas appliances appropriately and conveniently.

  In the present embodiment, the flow rate value, the flow rate change amount and the change time, and the history information of the usage status of the gas appliance are used as the appliance discriminating information stored in advance in the storage means 7, and the specific gas appliance is stored. Although the case where the determination is performed has been described, the present invention is not limited to this, and the flow rate change amount, the gas pressure, and the gas temperature that are increased in measurement frequency can be used as the instrument determination information of a specific gas appliance.

  About the gas meter comprised as mentioned above, the operation | movement and an effect | action are demonstrated regarding the setting of the continuous use time according to operation | movement of an instrument below.

  In FIG. 1, in the gas meter device 1, the flow rate measuring unit 3 measures the gas flow rate, for example, every 2 seconds, and sends the data to the calculation unit 6 to differentiate the flow rate value, and every 2 seconds (every 4 seconds or 6 seconds). (It may be every second.)

  This difference data is sent to the sequential determination means 8 and compared with the comparison determination value registered in the storage means 7. When the difference value exceeds the comparison determination value for determining activation, it is determined that the gas appliance has been activated, and the state is registered in the storage means 7. Further, when the gas appliance is stopped, a negative difference value is generated. When the gas appliance is coincident with the comparison determination value of the stop of the appliance registered for activation, it is determined that the appliance that has been operating is stopped.

  The detailed operation and action of the control means 10 that performs the device discrimination operation of FIG. 1 will be described as the control means 10a of FIG. 3 together with FIG.

  In FIG. 3, when the discriminating means 8 detects a pattern corresponding to the fan heater, for example, the activation flow rate pattern, the activation of the fan heater is determined.

  After detecting the activation of the fan heater, the control interval measuring means 11 starts measuring the time until the next control occurs.

  When the determination unit 8 detects a flow rate decrease (control decrease event), which is control equivalent to a fan heater, for example, the control interval measurement unit 11 acquires the time from the start of activation to the current control decrease event, and subsequently Start measuring the time until the next control occurs.

  When the determination means 8 again detects a flow rate decrease (control decrease event) that is control equivalent to a fan heater, the control interval measurement means 11 acquires the time from the start of activation to the current control decrease event, Start measuring the time until the next control occurs.

  Then, the duration setting means 12 from the control interval time acquired by the control interval measuring means 11 (in this case, the time T1 from the start to the first control, the time T2 from the first control to the second control). The optimum duration is set at, and counting of the duration set by the duration counting means 13 is started.

  Thereafter, the duration counting unit 13 counts the duration until the determination unit 8 detects the stop flow rate pattern and determines that the fan heater has stopped.

  When the count of the duration time counting means 13 reaches the set duration time, the communication means 9 is connected to a center for centralized gas monitoring via, for example, a public telephone line, and sends an alarm, and the gas shut-off valve Shut off.

  In FIG. 6, the fan heater is activated at time t1, and is operating at a stable flow rate Qa1. Since the fan heater is generally activated at the maximum combustion amount, an appliance activated with the activation pattern and the flow rate can be specified as the fan heater.

  In order to lower the combustion amount for temperature adjustment at time t2, a gas flow rate decrease event occurs, and an elapsed time T1 from the start to the first control event (decrease event) is acquired.

  At time t3, the combustion amount is decreased again to adjust the temperature, so that a gas flow decrease event occurs, and an elapsed time T2 from the first control event to the second control event is acquired.

  Differences from FIG. 3 will be described with reference to FIG.

  In FIG. 4, when the determining means 8 detects a flow pattern of activation corresponding to a fan heater, for example, the activation of the fan heater is determined.

  After detecting the activation of the fan heater, the control amount measuring means 14 starts integrating the gas flow rate until the next control occurs.

  When the determination unit 8 detects a flow rate decrease (control decrease event), which is control equivalent to a fan heater, for example, the control amount measurement unit 14 obtains an integrated flow rate of gas flow from the start to the current control decrease event. Subsequently, integration of the gas flow rate until the next control occurs is started.

  When the determination means 8 again detects a flow rate decrease (control decrease event) that is control equivalent to a fan heater, the control interval measurement means 11 acquires the time from the start of activation to the current control decrease event, Start measuring the time until the next control occurs.

  Then, the integrated flow rate acquired by the control amount measuring means 14 (in this case, the integrated flow rate Q1 (not shown) from the start to the first control) and the second integrated flow rate Q2 (not shown) from the first control. ), The optimum duration is set by the duration setting means 12 and counting of the duration set by the duration counting means 13 is started.

  When the count of the duration time counting means 13 reaches the set duration time, the communication means 9 is connected to a center for centralized gas monitoring via, for example, a public telephone line, and sends an alarm, and the gas shut-off valve Shut off.

  The difference from FIG. 4 will be described with reference to FIG.

  The history data holding means 15 holds history data such as the gas flow rate currently used and the continuous use time, for example, when the fan heater is continuously used and interrupted. Data related after the determination is held.

  And when the count of the continuous time counting means 13 reaches the set continuous time, the communication means 9 is connected to a center that performs centralized monitoring of gas via a public telephone line, for example, and transmits an alarm and history data, Shut off with gas shutoff valve 2.

  The center receives the history of fan heater usage for a predetermined time, confirms the usage status of the appliance and whether there is any abnormality, and confirms the gas flow rate and continuous usage time etc. It is possible to communicate with the user, and a more convincing explanation can be given, and the security function can be further improved.

  As described above, the gas shut-off device according to the present invention is connected to a household gas supply pipe, and includes a gas shut-off valve, a communication means capable of communicating with the outside, and a flow rate measuring means for measuring a gas flow rate at a constant time interval. Calculating means for determining a difference value between the flow rates output from the flow rate measuring means, storage means for storing a flow difference pattern and a comparison determination value for determining the activation amount, control amount, and stop amount of the appliance, and the calculation means Comparing the difference value calculated by the flow rate difference pattern and the comparison determination value registered in the storage means, and determining and detecting the activation, control, stop operation of the gas appliance to be used, Each time the control event of the appliance is judged by the discrimination means, the time from the start event to the control event, the control interval measuring means for measuring the time from the control event to the control event, and the control interval measuring means A duration setting means for calculating a duration according to the control interval, and a duration counting means for counting the duration set by the duration setting means, wherein the first period duration count means is a predetermined duration. Is counted, the communication means communicates with the outside to shut off the gas shutoff valve.

  And when the control interval is short, a short duration can be set, and when the control interval is long, a long duration can be set, so that gas can be shut off for a predetermined duration while considering convenience, and safety is improved. be able to.

The block diagram of the gas meter apparatus in embodiment of this invention Schematic configuration diagram of an ultrasonic flowmeter in an embodiment of the present invention The block diagram of the control means in embodiment of this invention The block diagram of the control means in embodiment of this invention The block diagram of the control means in embodiment of this invention Flow characteristic chart in the embodiment of the present invention The characteristic figure of the difference value of the flow in the embodiment of the invention The figure which shows an example of the instrument discrimination | determination information in embodiment of this invention The flowchart which shows the operation | movement procedure of the instrument discrimination | determination of embodiment of this invention The figure which shows an example of the timing which discriminate | determines a gas appliance in the change characteristic of the gas flow rate of embodiment of this invention. The figure which shows an example of the conventional continuous use safe time according to gas consumption Block diagram of a conventional gas meter device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas meter apparatus 2 Gas shut-off valve 3 Flow rate measuring means 4 Display part 5 Shock absorber 6 Calculation means 7 Storage means 8 Discriminating means 9 Communication means 10 Control means 11 Control interval measuring means 12 Duration setting means 13 Duration counting means 14 Control Quantity measuring means 15 History data holding means

Claims (5)

A flow rate measuring means for measuring the gas flow rate at regular time intervals;
A calculation means for obtaining a flow value output from the flow measurement means;
Storage means for storing a comparison judgment value of the instrument;
Discriminating means for discriminating and detecting the operating status of the gas appliance used;
Control interval measuring means for measuring an interval time in an operation event of the instrument by the discriminating means;
A duration setting means for calculating a duration according to the control interval measured by the control interval measuring means;
A duration counting means for counting the duration set by the duration setting means,
A gas shut-off device characterized in that the gas shut-off valve is shut off when the first-term duration counting means counts a predetermined duration. Connected to the household gas supply pipe,
A gas shut-off valve,
A communication means capable of communicating with the outside;
A flow rate measuring means for measuring the gas flow rate at regular time intervals;
A calculating means for obtaining a difference value between the flow rates output from the flow rate measuring means;
A storage means for storing a flow rate difference pattern and a comparison determination value for determining an activation amount, a control amount, and a stop amount of the appliance;
A discrimination for comparing the magnitude of the difference value calculated by the calculation means with the flow rate difference pattern or comparison judgment value registered in the storage means to discriminate and detect the activation, control, and stop operation of the gas appliance to be used Means,
Each time the control event of the appliance is judged by the discriminating means, the time from the start event to the control event, the control interval measuring means for measuring the time from the control event to the control event,
A duration setting means for calculating a duration according to the control interval measured by the control interval measuring means;
A duration counting unit that counts the duration set by the duration setting unit, and communicates to the outside by the communication unit when the previous period counting unit counts a predetermined duration and shuts off the gas. Gas shut-off device that shuts off the valve. Each time the control event of the appliance is judged by the discriminating means, there is a control amount measuring means for measuring an integrated flow rate from the start event to the control event and an integrated flow rate from the control event to the control event, and the duration setting means The gas cutoff device according to claim 1 or 2, wherein the amount of heat consumed is calculated from the integrated flow rate and the integrated time, and is set according to a pre-registered heat amount level. 4. The gas shut-off device according to claim 1, wherein the duration setting unit has a function that can be changed from the outside set in accordance with an airtightness level registered in advance. The discriminating means has history data holding means for storing history data such as an appliance discriminating result, a control interval, an integrated amount of gas flow rate, a duration time, etc., which has reached an alarm or shut-off, and the duration has passed, The gas shut-off device according to any one of claims 1 to 4, wherein together with the history data of the history data holding means, the communication means communicates with the outside.