JP5493610B2 - Gas shut-off device - Google Patents

Description

  The present invention improves the flow rate monitoring function of the gas shut-off device.

  Conventionally, this type of gas shut-off device is described as a configuration as described in Patent Document 1.

  FIG. 6 is a block diagram of a conventional gas shut-off device described in Patent Document 1 for easy comparison with the present invention.

  As shown in FIG. 6, the conventional gas shut-off device includes a flow rate detection unit 1, a flow rate calculation unit 2, an increase / decrease calculation unit 3, an increase / decrease determination unit 4, a timing unit 5, a valve drive unit 6, a valve 7, and a notification unit 8. The role is described below.

  The flow rate detection unit 1 outputs a flow rate signal a corresponding to the gas flow rate passing through the gas passage, and the flow rate calculation unit 2 calculates the flow rate b using the flow rate signal a of the flow rate detection unit 1.

  The increase / decrease calculation unit 3 compares the value of the flow rate b acquired the last time using the flow rate b of the flow rate calculation unit 2 with the flow rate b acquired this time, and outputs a change amount c if there is a flow rate change of 3% or more. If there is no change in flow rate of at least%, the difference between the sum of the plurality of changes c held and the latest flow rate b is constant and the sum of the plurality of changes c held is greater than the latest flow rate b. If so, the correction signal m is output.

  In the increase / decrease determination unit 4, if the change amount c output from the increase / decrease calculation unit 3 is an increase amount, the change amount c is added and held assuming that the use of a new gas appliance is started. After managing the plurality of variation amounts c while deleting the closest variation amount c held as having been stopped, reordering the plurality of variation amounts c in order from the largest The use permission time d based on the flow rate zone to which the largest change amount of the retained change amount c belongs is extracted, and a notice time e is calculated by subtracting a predetermined time held in advance from the use permission time d. The use permission time d and the notice time e are output, and if there is a correction signal m output by the increase / decrease calculation unit 3, the latest flow rate b of the flow rate calculation unit is obtained and the sum of the plurality of changes c held therein is obtained. Find the difference value minus the latest flow rate b, The minus the difference value as a new maximum variation retains the reduction amount, to obtain and output notice time e and use permission time d based on a new maximum variation.

  When the time counting unit 5 receives the use permission time d of the increase / decrease determination unit 4, it starts measuring the use time, and before acquiring the new use permission time d from the increase / decrease determination unit 4, the use time is notified to the increase / decrease determination unit 4. When the time e is reached, a notice signal f is output, and when the usage time reaches the use permission time d of the increase / decrease determination unit 4, a valve drive signal g is output.

  When the valve driving unit 6 receives the valve driving signal g from the time measuring unit 5, it outputs a closing signal h, and when the valve 7 receives the closing signal h from the valve driving unit 6, it closes the gas passage.

  Furthermore, the notification unit 8 is configured to output a warning notification signal n to the gas leak alarm 9 which is an external device when the notification signal f of the time measuring unit 5 is received.

JP 2009-30976 A

  However, the conventional configuration has the following problems.

  FIG. 7 (a) is an example of a flow rate zone classification table showing the correspondence between the flow rate zone previously held by the gas shutoff device and the use permission time d. For example, if the gas shut-off device having the conventional configuration has one change amount, that is, if the hold value is 403 L / h with only the maximum change amount (change amount 1), the change amount 1 is shown in FIG. Is 403 L / h, so the flow rate band is n. Since the sum of the change amounts c is 403 L / h, 3% of the sum is 12.09 L / h. If the difference between the previous flow rate b and the current flow rate b is not less than 12.09 L / h, the flow rate does not change. For this reason, as shown in FIG. 7B, if the flow rate b gradually decreases and the flow rate does not change, the correction does not work until 382 L / h of 403 L / h-21 L / h is reached (conventional). In the example, the constant flow rate of the second determination criterion is described as 21 L / h in the embodiment, and if this value is 1 L / h instead of 21 L / h, a phenomenon in which a similar gap is generated occurs. ). For this reason, even though the flow rate b exceeds the boundary of the flow rate zone (400 L / h shown by a one-dot broken line), it becomes an unsupported region where the correction does not work from 399 L / h to 383 L / h. There was a problem that it was impossible to monitor based on the new flow rate zone.

  Alternatively, when the change amount c held by the gas shut-off device having the conventional configuration is two or more, for example, the hold value of the maximum change amount (change amount 1) is 420 L / h, and the second largest change amount c is obtained. It is assumed that at 405 L / h, the two changes are in the same flow rate range. At this time, as in FIG. 7B, if the flow rate b gradually decreases and the flow rate does not change, the sum of the change amounts c is 825 L / h, so the current flow rate b is 804 L / h (second determination). When the reference constant flow rate is 21 L / h), the maximum amount of change 1 is 420 L / h- (825 L / h-804 L / h) = 399 L / h. Since the maximum change amount replaces the change amount 1 with 399 L / h, the change amount 1 belongs to the flow rate zone n-1.

  Therefore, the use permission time d is changed from 60 minutes in the flow rate zone n to 80 minutes in the flow rate zone n-1 as shown in FIG. That is, before the correction process, the change amount 1 and the change amount 2 belong to the same flow rate zone n from FIG. 7A, and no contradiction occurred, but the change amount 2 after the correction process remains 405 L / h. The value is larger than the amount of change 1 after the correction process, and the use permission time d must be 60 minutes based on the amount of change 2. However, a contradiction occurs because it is changed to 80 minutes by the correction process (conventional example) In the embodiment, the constant flow rate of the second determination criterion is described as 21 L / h, even if this value is 1 L / h instead of 21 L / h, the change 1 and the change 2 are the same value of 400 L / h. If there is, the same contradiction will occur).

  The present invention solves the above-described conventional problem, and corrects the maximum change amount based on the difference between the periodically measured flow rate and the reference value, and determines the flow rate band, thereby determining the use permission time. The purpose is to alert the gas supplier who is monitoring the gas shutoff device at a time when safety can be ensured by checking whether the abnormal gas is being used by changing or changing the notice time. And

In order to solve the above-described conventional problems, a gas shutoff device according to the present invention includes a flow rate detection unit that periodically outputs a flow rate signal corresponding to a gas flow rate passing through a gas passage, and the flow rate of the flow rate detection unit. The flow rate calculation unit that calculates the flow rate based on the signal, the flow rate value acquired at the previous time or the previous time using the flow rate of the flow rate calculation unit and the current flow rate are compared, and if there is a change, Increase / decrease calculation unit to be output, flow rate zone table that sets the usage permission time for each divided flow rate range, and if the change amount is an increase amount, the change amount is added as starting to use a new gas appliance If the amount of decrease is the amount of change, the plurality of variation amounts are managed and retained while deleting the closest variation amount that is held as having stopped using the gas appliance. Of the maximum change and the flow rate zone In the flow rate zone to which the maximum change amount belongs and an increase / decrease determination unit that outputs a notice time obtained by subtracting a predetermined time from the use permission time, and when the use permission time is received, the time measurement of the use time is started. When the usage time reaches the warning time, a warning signal is output; when the usage permission time is reached, a valve timing signal is output; and when the maximum change is received, the flow rate calculation unit acquires the flow rate. To obtain a difference between the reference value and the flow rate of the flow rate calculation unit that is periodically output, the difference is in an increasing direction, and the sum of the difference and the maximum change amount is the flow rate band. A flow rate change determination unit that changes a time obtained by subtracting a predetermined time from a use permission time based on a flow rate range after crossing to a notification time, and a closure signal when the valve drive signal is received. output A valve driving part, a valve for closing the gas passage when receiving the closing signal, and a notifying part for alarming using the warning signal. It is possible to monitor minute flow fluctuations that cannot be detected and managed, and change multiple changes that are managed based on clear ignition or extinguishing of gas appliances due to flow rate changes or adjustment of gas appliance flow rate. The use permission time and notice time can be adjusted without any problem.

  In the gas shutoff device of the present invention, the flow rate in the vicinity of the flow rate band appears and is registered as the maximum change amount. After that, for example, even if the gas usage changes due to the slight increase and decrease of gas by automatic temperature adjustment such as gas fan heater etc. Since the correction can be performed immediately after crossing the flow rate zone, there is no unsupported area, and it is possible to call attention at a timing at which safety can be ensured.

Functional block diagram of the gas cutoff device in Embodiment 1 of the present invention Program flow diagram in Embodiment 1 of the present invention (A) The figure which shows the relationship between the flow volume in Embodiment 1 of this invention, and use permission time, (b) The figure for demonstrating the correction process at the time of flow increase, (c) The correction process at the time of the flow decrease Figure to do The figure explaining the hysteresis process in Embodiment 1 of this invention The figure explaining the delay process of the time change in Embodiment 1 of this invention Functional block diagram of a conventional gas shut-off device (A) The figure which shows the relationship between the flow volume in the conventional gas cutoff device, and use permission time, (b) The figure for demonstrating the correction | amendment process at the time of the flow volume reduction | decrease of the gas cutoff device

According to a first aspect of the present invention, a flow rate detector that periodically outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, and a flow rate calculator that calculates a flow rate based on the flow rate signal of the flow rate detector, The flow rate value acquired by the flow rate calculation unit is compared with the flow rate value acquired last time or the previous time and the flow rate acquired this time, and if there is a change, an increase / decrease calculation unit that outputs a change amount, and a divided flow rate zone The flow rate zone table that defines the usage permission time for each time, and if the amount of change is an increase amount, the change amount is added and held as if the use of a new gas device is started. Managing the plurality of variation amounts while deleting the closest variation amount held as having been stopped, and maintaining the maximum variation amount among the plurality of variation amounts and the flow rate zone classification In the table, the flow rate zone to which the maximum change amount belongs is used. An increase / decrease determination unit that outputs a permission time and a notice time obtained by subtracting a predetermined time from the use permission time, and starts counting the use time when the use permission time is received, and if the use time reaches the notice time A timing unit that outputs a warning signal and further outputs a valve drive signal when the use permission time is reached, and receives the maximum amount of change, obtains the flow rate of the flow rate calculation unit as a reference value, When the difference is in the increasing direction and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone, the difference is obtained. A flow rate change determination unit that changes a time obtained by subtracting a predetermined time from a use permission time based on a later flow rate range to a notice time, a valve drive unit that outputs a closure signal when receiving the valve drive signal, and the closure signal When you receive It is characterized by comprising a valve for closing the passage and a notifying unit for alarming using the warning signal, and the flow rate gradually increases and the flow rate zone of the maximum flow rate is changed to a flow rate zone with a large flow rate. If it is determined that the gas has been used, the alarm can be notified at an earlier timing than the original notice time, and the gas supplier monitoring the gas use of the gas user will receive the alarm notification and the gas will be used properly. It is possible to determine whether or not the gas is present at an early timing, and it is possible to achieve both convenience and safety in using the gas.

  According to a second aspect of the present invention, there is provided a flow rate detection unit that periodically outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, and a flow rate calculation unit that calculates a flow rate based on the flow rate signal of the flow rate detection unit, The flow rate zone table that defines the use permission time for each of the divided flow rate zones, and the flow rate value acquired this time or the previous time using the flow rate of the flow rate calculation unit is compared with the flow rate acquired this time, An increase / decrease calculation unit that outputs a change amount if there is a change, and if the change amount is an increase amount, the change amount is added and held as if a new gas appliance has started to be used. Managing the plurality of variation amounts while deleting the closest variation amount held as having been stopped, and maintaining the maximum variation amount among the plurality of variation amounts and the flow rate zone classification In the table, the flow rate zone to which the maximum variation An increase / decrease determination unit that outputs a permission time and a notice time obtained by subtracting a predetermined time from the use permission time, and starts counting the use time when the use permission time is received, and if the use time reaches the notice time A timing unit that outputs a warning signal and further outputs a valve drive signal when the use permission time is reached, and receives the maximum amount of change, obtains the flow rate of the flow rate calculation unit as a reference value, When the difference is in the decreasing direction and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone, the difference is obtained. A flow rate change determination unit that changes a use permission time based on a later flow rate band to a new use permission time, a valve drive unit that outputs a closing signal when receiving the valve driving signal, and a gas passage when receiving the closing signal Valve closing , Characterized in that it comprises a notifying unit for alerting using the warning signal, when the flow rate is gradually decreased and the flow rate zone of the maximum flow rate is determined to have been changed to a small flow rate zone, By keeping the original notice time as it is and extending the use permission time longer than the original use permission time, it is possible to issue an alarm notification at an early timing with respect to the use permission time, and monitor the gas use of the gas user. When the gas supplier receives the alarm notification, it can be determined at an early timing whether or not the gas is being used properly, and both convenience and safety of gas use can be achieved.

According to a third aspect of the present invention, there is provided a flow rate detector that periodically outputs a flow signal corresponding to a gas flow rate passing through the gas passage, and a flow rate calculator that calculates a flow rate based on the flow rate signal of the flow rate detector. The flow rate value acquired by the flow rate calculation unit is compared with the flow rate value acquired last time or the previous time and the flow rate acquired this time, and if there is a change, an increase / decrease calculation unit that outputs a change amount, and a divided flow rate zone The flow rate zone table that defines the usage permission time for each time, and if the amount of change is an increase amount, the change amount is added and held as if the use of a new gas device is started. Managing the plurality of variation amounts while deleting the closest variation amount held as having been stopped, and maintaining the maximum variation amount among the plurality of variation amounts and the flow rate zone classification In the table, the flow rate zone to which the maximum change amount belongs is used. An increase / decrease determination unit that outputs a permission time and a notice time obtained by subtracting a predetermined time from the use permission time, and starts counting the use time when the use permission time is received, and if the use time reaches the notice time A timing unit that outputs a warning signal and further outputs a valve drive signal when the use permission time is reached, and receives the maximum amount of change, obtains the flow rate of the flow rate calculation unit as a reference value, When the difference is in the increasing direction and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone, the difference is obtained. The time obtained by subtracting the predetermined time from the use permission time based on the later flow rate zone is changed to the advance notice time, the difference is in a decreasing direction, and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone. If so, after straddling A flow rate change determination unit that changes a use permission time based on a flow rate band to a new use permission time, a valve drive unit that outputs a closing signal when receiving the valve driving signal, and a gas passage that closes the gas passage when receiving the closing signal And a notifying unit for alarming using the warning signal, and it is determined that the flow rate gradually increases and the flow rate zone of the maximum flow rate has been changed to a flow rate zone. If it is determined that the alarm has been announced at a timing earlier than the original notice time, and the flow rate has gradually decreased and the maximum flow rate zone has been changed to a smaller flow rate zone, By leaving the notice time as it is and extending the use permission time from the original use permission time, it is possible to alert the use permission time at an early timing. It is possible to notify the alarm at an early timing, and the gas supplier who monitors the gas use of the gas user receives the alarm notification to judge at an early timing whether or not the gas is being used properly. This makes it possible to achieve both convenience and safety in using gas.

  In the fourth invention, particularly in the first invention, the sum of the maximum change amount and the difference is changed over the boundary flow rate in the flow rate zone table, and then returned to the flow rate zone before crossing again. In this method, hunting is prevented by providing hysteresis to the determined boundary flow rate.

  The fifth aspect of the present invention is the flow rate band after a predetermined time has elapsed after determining that the sum of the maximum change amount and the difference has crossed the boundary flow rate of the flow rate zone division table, particularly in any one of the first to fourth aspects of the invention. If it is, the notice time or use permission time is changed. By confirming that the flow rate is stable, it is possible to prevent the notice time and use permission time from being inadvertently changed. .

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

(Embodiment 1)
FIG. 1 shows a functional block diagram of a gas cutoff device in Embodiment 1 of the present invention.

  In FIG. 1, the gas shut-off device of Embodiment 1 includes a flow rate detection unit 11, a flow rate calculation unit 12, an increase / decrease calculation unit 13, an increase / decrease determination unit 14, a timer unit 15, a valve drive unit 16, a valve 17, a notification unit 18, a flow rate. The band change determination unit 19 is described below and its role is described below.

  The flow rate detection unit 11 periodically (for example, every 1 second or every 1 minute) corresponding to the gas flow rate passing through the gas passage, the flow rate signal A (for example, the superposition facing the gas passage) A gas sensor may be installed to detect the gas flow rate from the difference in the propagation time of the ultrasonic wave, or a gas flow path may be created in the gas passage and the gas flow rate detected from the vibration generated when the gas flows through the path. Alternatively, the same effect can be obtained by detecting a pulse output every time a predetermined gas flows.

  The flow rate calculation unit 12 calculates the flow rate B based on the flow rate signal A of the flow rate detection unit 11 by multiplying the flow rate signal A by a coefficient weighted to the flow rate signal A held in advance. The flow rate B may be obtained from a single flow rate signal A, or the averaged flow rate B may be obtained from a plurality of flow rate signals A).

The increase / decrease calculation unit 13 may use the flow rate B of the flow rate calculation unit 12 the previous time or the previous time (for example, only the previous time or the previous time may be used as a comparison with the current flow rate B, or both the previous time and the previous time may be used as a comparison control. The acquired flow rate B may be compared with the acquired flow rate B. The flow rate B acquired this time is compared. If there is no change, nothing is performed. If there is a change (for example, a predetermined difference value) The change amount C (gas appliance flow rate) may be output. The change amount C (gas appliance flow rate) may be output.

  The increase / decrease determination unit 14 adds and holds the change amount C if the change amount C output from the increase / decrease calculation unit 13 is an increase amount, and starts to use a new gas appliance. It is possible to subtract the decrease amount for each retained change amount C, and use the smallest absolute value as the closest change amount C. ) Managing a plurality of change amounts C while deleting the change amounts C, then rearranging the plurality of change amounts C in order from the largest, and after reordering, The use permission time D (for example, the flow band n, for example, based on the flow rate zone to which the large maximum change amount I belongs (for example, the flow rate band is n when the maximum change amount I is 600 L / h from the table of FIG. 3A). The use permission time D is 60 minutes) Preliminary time E obtained by subtracting a predetermined time (for example, 5 minutes) held in advance from time D (for example, if 5 minutes of the predetermined time is subtracted from 60 minutes of use permission time D of flow rate zone n, 55 minutes). The use permission time D, the advance notice time E, and the maximum change amount I are output.

  When receiving the use permission time D of the increase / decrease determination unit 14, the timer unit 15 starts measuring the use time, and before acquiring a new use permission time D from the increase / decrease determination unit 14, 2 If the notice time K is received, if the use time reaches the second notice time K, the notice signal F (for example, when the second notice time K is output, the use time has already exceeded the second notice time K). If the second warning time K is output, the warning signal F may be output), and if the second warning time K of the flow rate change determination unit 19 has not been received, the use time increase / decrease determination unit When the notice time E reaches 14, notice signal F is output. Further, if the third use permission time J of the flow rate change determination unit 19 is received, the valve drive signal G is output when the use time reaches the third use permission time J, and the third use permission of the flow rate change determination unit 19. If the time J is not received, the valve drive signal G is output when the usage time reaches the usage permission time D of the increase / decrease determination unit 14.

  When the valve drive unit 16 receives the valve drive signal G from the time measuring unit 15, the valve drive unit 16 outputs a closing signal H. When the valve 17 receives the closing signal H from the valve drive unit 16, the valve 17 closes the gas passage.

  The notification unit 18 uses the warning signal F of the time measuring unit 15 to issue an alarm notification (for example, a gas user who uses gas by displaying on the LCD or LED, sees the display and contacts the gas supplier by telephone or the like) May communicate via a wired or wireless public communication line, or the same effect can be obtained by notifying the gas supplier via communication via the Internet) .

When the flow rate change determination unit 19 receives the maximum change amount I of the increase / decrease determination unit 14, the flow rate change determination unit 19 acquires the flow rate B of the flow rate calculation unit 12 as a reference value, and receives a new maximum change amount I from the increase / decrease determination unit 14 ( That is, the maximum change I does not change until the gas appliance is ignited or extinguished, or the gas appliance flow rate is adjusted and the flow rate is changed. The difference between the value and the flow rate B of the flow rate calculation unit 12 that is periodically output is obtained, and the difference (for example, when the amount gradually changed without changing the flow rate is 200 L / h) is the difference and the maximum in the increasing direction. When the sum with the change amount I (for example, 800 L / h when the maximum change amount I is 600 L / h and the difference is 200 L / h) straddles the flow rate band (for example, in the case of FIG. 3B) , The second use permission time based on the flow rate zone after straddling ( For example, from FIG. 3A, when the maximum change I is 600 L / h, the flow rate is n, and when the difference is 200 L / h, the sum of the maximum change I and the difference is 800 L / h, and the flow rate is n + 1. Therefore, the second use permission time is 40 minutes, and the second notice time K (for example, the flow rate band) obtained by subtracting the predetermined time (for example, 5 minutes) previously held from the second use permission time is extracted. Subtract 5 minutes from n + 1 for 40 minutes to get 35 minutes) and output the difference (for example, if the amount changed gradually without changing flow is -201 L / h)
When the sum of the difference and the maximum change I in the decreasing direction (for example, 399 L / h when the maximum change I is 600 L / h and the difference is −201 L / h) crosses the flow rate zone (for example, FIG. 3 (c)), the third use permission time J based on the flow rate band after straddling (for example, the maximum flow rate I is 600 L / h, the flow rate range is n, and the difference is − In the case of 201 L / h, the sum of the maximum change amount I and the difference is 399 L / h, and the flow rate band is n−1, so the third use permission time J is 80 minutes).

  As described above, in the present embodiment, the flow rate change determination unit 19 determines whether to cross the flow rate range by adding the difference between the flow rate B and the reference value to the maximum change amount I. 2 The advance notice time K (for example, 35 minutes from the above example) or the third use permission time J (for example, 80 minutes from the above example) can be extracted. As a result, the alarm is issued at an earlier timing than the original notice time E based on the second notice time K (for example, the use permission time D of the time zone n is 60 minutes minus 60 minutes minus 55 minutes from the above example). It is possible to make a notification, or the notice time E is kept instead of the third notice time based on the original third use permission time J (for example, 75 minutes minus 80 minutes from the above example). Thus, the timing is earlier than the third notice time (from the time when the maximum change amount I is registered or rearranged, it is automatically changed in the conventional example so that 75 minutes have elapsed, but in the present invention, it remains 55 minutes. It becomes possible to make an alarm notification.

  Therefore, it becomes possible for the gas supplier who monitors the gas use of the gas user to determine whether or not the gas is being used properly at an early timing by receiving an alarm notification, and the convenience of gas use Both safety can be achieved.

  Next, the operation will be described with reference to the program flow diagram shown in FIG.

  The process S01 in the flow rate detector 11 detects the gas flow rate from the difference in the propagation time of the ultrasonic wave by attaching a flow rate signal A corresponding to the gas use of the gas user (for example, by attaching an ultrasonic sensor facing the gas passage). Alternatively, a gas flow path may be created in the gas passage, and the gas flow rate may be detected from vibration generated when the gas flows through the gas path, or a pulse output every time a predetermined gas flows is detected. (Same effect can be obtained) (for example, every second or every minute), and the process proceeds to step S02.

  In the flow rate calculation unit 12, the process S02 may calculate the flow rate B by multiplying the flow rate signal A by a coefficient that gives a weight to the flow rate signal A (for example, the flow rate signal A held in advance). The flow rate B may be obtained from the single flow rate signal A, or the average flow rate B may be obtained from the plurality of flow rate signals A), and the process proceeds to step S03.

  In the increase / decrease calculation unit 13, the process S03 calculates an increase / decrease flow rate (the value of the flow rate B acquired last time or the previous time and the flow rate B acquired this time), and proceeds to the process S04. The process S04 determines whether or not there is a change based on the increase / decrease flow rate (for example, the determination may be made with a predetermined difference value or more, or the same effect can be obtained with the change rate). Is transferred to the process S05 as a change amount C, and if there is no change, the process proceeds to the process S10.

  In the increase / decrease determination unit 14, the process S05 determines whether the change amount C is an increase amount or a decrease amount. If the change amount C is an increase amount, the process proceeds to a process S06, and if it is a decrease amount, the process proceeds to a process S07.

The process S06 manages the plurality of variation amounts C while registering the variation amounts C, rearranges the plurality of variation amounts C held in order from the largest, and arranges the plurality of variation amounts C retained after the reordering. The largest change amount C is set as the maximum change amount I, and the use permission time D based on the flow rate zone to which the maximum change amount I belongs (for example, the maximum change amount I is 600 L / h from the table of FIG. 3A). In this case, the flow rate zone is n, and the usage permission time D of the flow rate zone n is 60 minutes) and the notice time E (for example, the usage permission time D of the time zone n is 60 minutes, minus 5 minutes of the predetermined time from 60 minutes) 55 minutes) is calculated, and the process proceeds to step S08.

  The process S07 is the closest among the plurality of stored values (for example, the decrease amount is subtracted for each stored change amount C, and the smallest absolute value may be used as the closest change amount C). A plurality of change amounts C are managed while deleting the change amount C, and then the plurality of change amounts C that are held are rearranged in order from the largest, and after the reordering, the plurality of change amounts C that are held The largest change amount C among them is defined as the maximum change amount I, and the use permission time D based on the flow rate zone to which the maximum change amount I belongs (for example, the flow rate zone is n when the maximum change amount I is 600 L / h). For example, the use permission time D of the flow rate zone n is 60 minutes), and a notice time E (for example, the flow rate zone is obtained by subtracting a predetermined time (for example, 5 minutes) held in advance from the use permission time D. n from 60 minutes of the permitted use time D to 5 minutes of the predetermined time Draw when it comes to 55 minutes) is calculated and the process proceeds to S08 to.

  In step S08, the flow rate change determination unit 19 holds the flow rate B as a reference value and proceeds to step S09. The process S09 clears the elapsed timer that counts the elapsed time until the use permission time D is reached, and proceeds to the process S01.

  In step S10, the difference between the periodically acquired flow rate B and the reference value is calculated, and the process proceeds to step S11.

  The process S11 determines whether or not the sum of the difference between the flow rate B and the reference value and the maximum change amount I crosses the flow rate zone (for example, when the boundary of the table shown in FIG. 3A is exceeded). If straddling the band, the process proceeds to step S12, and if not straddling the flow band, the process proceeds to step S15.

  In process S12, it is determined whether the difference between the flow rate B and the reference value is an increasing direction or a decreasing direction. If the difference is an increasing direction, the process proceeds to process S13, and if the difference is a decreasing direction, the process proceeds to process S14.

  In the process S13, the sum of the difference between the flow rate B and the reference value and the maximum change amount I (for example, 800 L / h when the maximum change amount I is 600 L / h and the difference is 200 L / h) crosses the flow rate band. In the case (for example, in the case of FIG. 3B), the second use permission time based on the flow rate band after straddling (for example, in FIG. 3A, the maximum change amount I is 600 L / h, the flow rate band is n. When the difference is 200 L / h, the sum of the maximum change amount I and the difference is 800 L / h, and the flow rate zone is n + 1. Therefore, the second use permission time is 40 minutes) and the second use permission is extracted. Calculate and process a second notice time K obtained by subtracting a predetermined time (for example, 5 minutes) held in advance from the time (for example, subtracting 5 minutes of the predetermined time from 40 minutes of the flow rate zone n + 1 is 35 minutes). The process proceeds to S15.

  Process S14 is the sum of the difference between the flow rate B and the reference value and the maximum change amount I (for example, 399 L / h when the maximum change amount I is 600 L / h and the difference is -201 L / h). When straddling (for example, in the case of FIG. 3C), the third use permission time J based on the flow rate band after straddling (for example, when the maximum change I is 600 L / h from FIG. n, if the difference is -201 L / h, the sum of the maximum change amount I and the difference is 399 L / h and the flow rate band is n-1, so the third use permission time J is 80 minutes) Then, the process proceeds to process S15.

  In the timer unit 15, the process S15 counts the elapsed timer and proceeds to the process S16.

The process S16 determines whether the elapsed timer and the second advance notice time K coincide with each other if the second advance notice time K is present (for example, when the second advance notice time K is output, the elapsed timer has already been set to the second advance notice). If the time K has been exceeded, the process may proceed to step S17 when the second notice time K is output), or if there is no second notice time K, the elapsed timer and the notice time E If they match, the process proceeds to step S17. If they do not coincide with the notice time E or the second notice time K, the process proceeds to step S18.

  In the notification unit 18, the process S <b> 17 may be an alarm notification (for example, a gas user using gas by displaying on an LCD or an LED may see the display and contact the gas supplier by telephone or the like. Then, communication may be performed via a wired or wireless public communication line, or the same effect can be obtained even if the gas supplier is notified by communication via the Internet or the like.

  In the time measuring unit 15, the process S18 determines whether the elapsed timer and the third use permission time J match if there is a third use permission time J, and moves to the process S19 if they match, or the third use permission time J is determined. If not, it is determined whether or not the use permission time D matches. If they match, the process proceeds to step S19. If they do not match the use permission time D or the third use permission time J, the process proceeds to step S01.

In the valve drive unit 16, the process S19 uses the valve 17 to close the gas passage and stop the process. (In addition, when the gas passage is opened, the process is executed again from the process S01)
In addition, the flow rate change determination unit 19 takes into account the difference between the flow rate B and the reference value to the maximum change amount I and determines that the flow rate range (for example, the flow rate range n → the flow rate range n−1) is straddled, and then the difference is calculated. When the added maximum change I returns to the flow rate band before straddling again (for example, (flow rate band n →) flow rate n−1 → flow rate n), the hysteresis is applied to the determination on the flow rate band side before straddling (FIG. 3). As shown in (d), when the flow rate zone n-1 is once changed to the right side of the flow rate zone transition point and then becomes the flow rate zone n again, the transition of the flow rate zone is frequently repeated. The flow rate zone n is provided with a hysteresis H of 10 L / h).

  Therefore, it is possible to prevent so-called hunting in which the flow rate band is frequently changed.

  Furthermore, the flow rate change determination unit 19 takes into account the difference between the flow rate B and the reference value to the maximum change amount I and determines that the flow rate range (for example, the flow rate range n → the flow rate range n−1) is straddled. The second predetermined period T (for example, 1 minute) that the maximum change amount I taking into account is not returned to the flow rate band before the crossing again (for example, (flow rate band n →) flow rate band n−1 → flow rate band n). Until the second notice time or the third use permission time is delayed.

  Therefore, the flow rate change determination unit 19 monitors that there is no fluctuation in the flow rate B as shown in FIG. 3D during the second predetermined period T, and then at the second notice time or the third use permission time. By replacing it, the stability of the flow rate B can be taken into account.

  This process determines the second predetermined period T (for example, 1 minute) in the process S11 in the program flow diagram of FIG. 2, and proceeds to the process S12 when the second predetermined period is reached. If not, the process proceeds to step S15.

  As described above, it is determined whether or not the flow rate zone is crossed by adding the difference between the reference value and the flow rate B to the maximum change amount I. If it is crossed, the monitoring is performed based on the second notice time or the third use permission time. By ensuring that the gas supplier performs safety, the convenience of the gas shutoff device can be prevented from being impaired.

  In the present embodiment, the case where the sum of the maximum flow rate and the difference increases and decreases is described together. However, even when only the increase or only the decrease, the early purpose of the present invention is achieved. It goes without saying that a warning can be issued.

  As described above, the gas shutoff device according to the present invention can monitor the gradually changing flow rate without changing the flow rate, correct the use permission time and the advance notice time, and notify the supplier at an early timing. If is replaced with electricity or water, it can also be applied to uses such as electric meters and water meters.

DESCRIPTION OF SYMBOLS 11 Flow rate detection part 12 Flow rate calculation part 13 Increase / decrease calculation part 14 Increase / decrease determination part 15 Timing part 16 Valve drive part 17 Valve 18 Notification part 19 Flow rate zone change determination part

Claims (5)

A flow rate detector that periodically outputs a flow signal corresponding to a gas flow rate passing through the gas passage, a flow rate calculator that calculates a flow rate based on the flow rate signal of the flow rate detector, and a flow rate calculator Compare the value of the flow rate acquired last time or the previous time with the flow rate and the flow rate acquired this time, and if there is a change, an increase / decrease calculation unit that outputs the change amount, and a use permission time for each divided flow rate zone If the amount of change is determined and the amount of change is an increase, the amount of change is added and held as if a new gas appliance has started to be used. A plurality of change amounts are managed while deleting the closest change amount held, and the maximum change amount among the plurality of change amounts held, and the maximum change amount in the flow rate zone table The usage permission time of the flow zone to which An increase / decrease determination unit that outputs a notice time obtained by subtracting a predetermined time from the use permission time, and when the use permission time is received, starts measuring the use time, and outputs a notice signal when the use time reaches the notice time In addition, when the use permission time is reached, a timer unit that outputs a valve drive signal, and when the maximum change amount is received, the flow rate of the flow rate calculation unit is acquired as a reference value, and the reference value is periodically output. If the difference is in the increasing direction and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone, the flow rate zone after straddling A flow rate change determination unit that changes a time obtained by subtracting a predetermined time from a use permission time based on the above to a notice time, a valve drive unit that outputs a closing signal when receiving the valve driving signal, and a gas passage when receiving the closing signal Plug Gas cutoff apparatus characterized by comprising a valve, and a notification unit for alarm notification using the warning signal. A flow rate detection unit that periodically outputs a flow rate signal corresponding to the gas flow rate passing through the gas passage, a flow rate calculation unit that calculates a flow rate based on the flow rate signal of the flow rate detection unit, and a divided flow rate zone The flow rate zone table that defines the use permission time for each time, the flow rate value acquired last time or the previous time using the flow rate of the flow rate calculation unit and the flow rate acquired this time are compared, and if there is a change, the change amount If the change amount is an increase amount, the change amount is added and retained if the change amount is an increase amount, and if the change amount is a decrease amount, the use of the gas appliance is stopped. A plurality of change amounts are managed while deleting the closest change amount held, and the maximum change amount among the plurality of change amounts held, and the maximum change amount in the flow rate zone table The usage permission time of the flow zone to which An increase / decrease determination unit that outputs a notice time obtained by subtracting a predetermined time from the use permission time, and when the use permission time is received, starts measuring the use time, and outputs a notice signal when the use time reaches the notice time In addition, when the use permission time is reached, a timer unit that outputs a valve drive signal, and when the maximum change amount is received, the flow rate of the flow rate calculation unit is acquired as a reference value, and the reference value is periodically output. If the difference is in the decreasing direction and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone, the flow rate zone after straddling A flow rate change determination unit that changes a use permission time based on the new use permission time, a valve drive unit that outputs a closing signal when receiving the valve driving signal, and a valve that closes the gas passage when receiving the closing signal And the notice Gas cutoff apparatus characterized by comprising a notification unit for alarm notification using. A flow rate detector that periodically outputs a flow signal corresponding to a gas flow rate passing through the gas passage, a flow rate calculator that calculates a flow rate based on the flow rate signal of the flow rate detector, and a flow rate calculator Compare the value of the flow rate acquired last time or the previous time with the flow rate and the flow rate acquired this time, and if there is a change, an increase / decrease calculation unit that outputs the change amount, and a use permission time for each divided flow rate zone If the amount of change is determined and the amount of change is an increase, the amount of change is added and held as if a new gas appliance has started to be used. A plurality of change amounts are managed while deleting the closest change amount held, and the maximum change amount among the plurality of change amounts held, and the maximum change amount in the flow rate zone table The usage permission time of the flow zone to which An increase / decrease determination unit that outputs a notice time obtained by subtracting a predetermined time from the use permission time, and when the use permission time is received, starts measuring the use time, and outputs a notice signal when the use time reaches the notice time In addition, when the use permission time is reached, a timer unit that outputs a valve drive signal, and when the maximum change amount is received, the flow rate of the flow rate calculation unit is acquired as a reference value, and the reference value is periodically output. If the difference is in the increasing direction and the sum of the difference and the maximum change amount crosses the boundary flow rate of the flow rate zone, the flow rate zone after straddling When the time obtained by subtracting the predetermined time from the use permission time based on the above is changed to the notice time, the difference is in the decreasing direction, and the sum of the difference and the maximum change amount straddles the boundary flow rate of the flow rate zone, Based on the flow zone after straddling A flow rate change determination unit that changes the use permission time to a new use permission time, a valve drive unit that outputs a closing signal when receiving the valve driving signal, a valve that closes a gas passage when receiving the closing signal, A gas shut-off device, comprising: a notification unit that issues a warning using the warning signal. When the sum of the maximum change amount and the difference crosses the boundary flow rate in the flow rate zone table, the flow rate zone category is changed, and when returning to the flow rate zone before crossing again, a hysteresis is provided for the determined boundary flow rate. The gas shut-off device according to claim 3, wherein hunting is prevented. After determining that the sum of the maximum change amount and the difference crosses the boundary flow rate of the flow rate zone table, the notice time or use permission time is changed if the flow rate zone is after a predetermined time span. The gas interruption | blocking apparatus of any one of 1-4.