JP5093045B2 - Gas shut-off device - Google Patents

Description

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

Conventionally, as shown in FIG. 3, this type of gas shut-off device includes a flow rate detection unit 1 that outputs a flow rate signal a corresponding to a gas flow rate passing through a gas passage, and the flow rate signal a of the flow rate detection unit 1. When the flow rate calculation unit 2 for calculating the flow rate b is received and the flow rate b of the flow rate calculation unit 2 is received, the value of the flow rate b acquired last time is compared with the flow rate b acquired this time, and there is no change. If no change is made, the increase / decrease calculation unit 3 that outputs the change amount c when there is a change, and if the change amount c output by the increase / decrease calculation unit 3 is the increase amount, use of a new gas appliance is started. The change amount c is added and held, and if it is a decrease amount, a plurality of the change amounts c are deleted while deleting the change amount c closest to the use of the gas appliance that has been stopped. Manage and keep multiple changes c from large Before the start of counting the usage time calculated based on the largest amount of change c held after reordering, starting the time measurement, and acquiring the change amount c of the increase / decrease calculation unit 3 again When the usage time elapses, the increase / decrease determination unit 4 that outputs the valve drive signal d, the valve drive unit 5 that outputs the closing signal e when the valve drive signal d of the increase / decrease determination unit 4 is received, and the valve drive unit When the closing signal e of 5 is received, the valve is configured to close the gas passage (for example, see Patent Document 1).
JP-A 61-289227

  The conventional gas shut-off device describes the addition and deletion of a plurality of variation amounts, but does not describe the variation correction. However, since the handling of this variation is described as background art, it is illustrated.

  However, in the above-mentioned conventional configuration, when the total amount of gas actually used decreases, the close amount of change that the gas shut-off device holds is deleted, so when the change amount is deleted It is a well-known fact that an error occurs in the sum of the total amount of gas actually used and the amount of change held in the gas shut-off device. That is, FIG. 2 shows the total amount of gas used by the three devices, “device 1” of device 1, “device 2” of device 2, and “device 3” of device 3.

  As shown in FIG. 2a, when "container 1" starts to be used, "container 2" starts to use, "container 3" starts to use, and the total amount of gas used decreases, as shown in FIG. 1 ”,“ vessel 1 ”+“ vessel 2 ”,“ vessel 1 ”+“ vessel 2 ”+“ vessel 3 ”, which is good when the total gas usage increases, but it is close when the total gas usage decreases Since the gas appliance was estimated as “Vessel 2”, a “shortage” occurred.

In this way, an error (in this example, a shortage) may occur each time the total gas usage decreases, and the sum of the errors may also increase (the reverse pattern in which the actually reduced amount increases) There was a case where the balance was kept). If the sum of these errors increases, the sum of the changes held by the gas shut-off device decreases, so the largest change itself is inevitably a small value that is far from the actual gas appliance usage. End up. It is a well-known fact that when the usage time is extracted based on the amount of change that has become small apart from the actual gas appliance, the time until the gas passage is closed increases (the type of gas appliance such as a water heater or a fan heater). The amount of usage and the amount of time determined for each are inversely proportional (because the amount of gas used is short and the amount of gas used is short). For this reason, since it becomes later than the time to originally close the gas passage, there is a problem that it may become unsafe in use of the gas.

  The present invention solves the above-described conventional problems, and as shown in FIG. 2c, the largest change amount (in this example, “unit 3”) held by the gas shut-off device is insufficient (in this example, corrected). (The amount) is taken into account (if the magnitude relationship between the close change amount to be deleted and the reduced change amount is reversed, the shortage is subtracted from the largest change amount). The purpose is to correct the discrepancy and divergence from the sum of the amount of change held.

  In order to solve the above-described conventional problem, the gas shutoff device of the present invention is configured so that the increase / decrease determination unit 14 obtains the corrected change amount G from the increase / decrease correction unit 17 or the constant increase / decrease correction unit 18 to obtain the largest change amount. This is deleted and held as a new change amount C. Thus, the gas shut-off device can correct the deviation and deviation between the total amount of gas actually used and the sum of the change amounts held by the gas shut-off device.

  The gas shut-off device of the present invention extracts the gas usage time with the largest change amount of the conventional one, and at the same time, the sum of the total amount of gas actually used and the change amount held by the gas shut-off device. When there is a divergence between 齟齬 and 発 生, the difference can be corrected, and the time until the gas passage is closed is prevented from becoming longer due to 齟齬 and divergence. By holding the amount as a new change amount C, there is a possibility that the largest change amount held by the gas shutoff device is larger than the use amount of the maximum gas appliance actually used. Even if it becomes larger, the time until the gas passage is closed is shortened, so it is possible to stop the gas appliances from being released earlier, so that safety can be ensured), and convenience and safety Can achieve both .

The first invention includes a flow rate detection unit that outputs a flow rate signal in response to the gas flow passing through the gas passage, and a flow rate calculation unit for calculating a flow rate upon receiving the flow signal, the flow rate of the flow rate calculation unit The flow rate value acquired last time and the flow rate acquired this time are compared, and if there is no change, nothing is performed, and if there is a change, an increase / decrease calculation unit that outputs a change amount, and the increase / decrease calculation unit If the output amount of change is an increase amount, the use of a new gas appliance is started and the change amount is added and held. If the amount of decrease is a decrease amount, the use of the gas appliance is stopped and held. and decrease determination unit for outputting a decrease processed signal to manage the amount of change multiple top while deleting a near correct amount of change, when receiving the increase and decrease processed signal, the increase and decrease determination unit is more hold Get all changes and get changes Comparing the sum and the flow rate of the flow rate calculation unit, if there is no difference greater than or equal to a predetermined value, nothing is performed, and if there is a difference greater than or equal to a predetermined value, the maximum change amount obtained from the increase / decrease determination unit is calculated. An increase / decrease correction unit that adds and subtracts the difference and outputs a corrected change amount, a valve drive unit that outputs a closing signal when receiving a valve driving signal from the increase / decrease determination unit , and a gas passage when receiving the closing signal The increase / decrease determination unit deletes the largest change amount held when the corrected change amount is acquired and holds the corrected change amount as a new change amount. Reorder the amount of change held in order from the largest.After reordering, extract the usage time based on the largest amount of change held and start timing, and again change the amount of change in the increase / decrease calculation unit. Before getting When use time has elapsed by outputting a valve drive signal, and inconsistency by matching between a plurality of the variation which the increase and decrease correction unit the decrease determination unit and the flow rate of the flow rate calculation unit holds Deviation can be prevented.

  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 flow rate detection unit 11 may detect a gas flow rate from a difference in ultrasonic propagation time by attaching an ultrasonic sensor facing the gas passage (for example, an ultrasonic sensor facing the gas passage), A gas flow path may be created in the gas passage, and the gas flow rate may be detected from vibrations that occur when the gas flows through the gas path. The gas flow rate is measured each time the gas flow rate is measured and reaches a certain flow rate. The flow rate signal A is output in response to the same effect even if it is detected.

  When the flow rate calculation unit 12 receives the flow rate signal A from the flow rate detection unit 11, the flow rate calculation unit 12 calculates the flow rate B.

  When the flow rate calculation unit 13 receives the flow rate B of the flow rate calculation unit 12, the increase / decrease calculation unit 13 compares the value of the flow rate B acquired last time with the flow rate B acquired this time. If there is no change, nothing is performed. The change amount C is output. (The same effect can be obtained even if it is determined by a predetermined difference value or more, or by the change rate).

When the increase / decrease correction unit 17 receives the increase / decrease processed signal F of the increase / decrease determination unit 14, the increase / decrease determination unit 14 acquires all the change amounts C held by the increase / decrease determination unit 14 (for example, the total amount of gas used in FIG. 2C decreases). At that time, the data of “device 1” and “device 3” are obtained), and the sum of the obtained change amounts C and the flow rate B of the flow rate calculation unit 12 are compared, and if there is no difference greater than a predetermined value, nothing is performed. Thus, the determination may be made with a difference greater than or equal to a predetermined value (for example, a predetermined value (100 L / h) or more. The determination of “predetermined value or more” reflects a minute change in gas usage amount in the largest change amount C). If there is a need for fine correction, the determination of “above a predetermined value” may not be performed. For example, when the total amount of gas used (= flow rate B) in FIG. In “1” “device 3”, “device 3” is large, so “device 3” is added, and the difference (correction amount) calculated is added or subtracted (additional side when mainly improving safety) If the main purpose is to improve convenience, it may be narrowed down to only one of the subtraction sides and corrected to obtain a corrected change amount G (for example, “unit 3 + correction amount in FIG. 2c). Is 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. A plurality of changes while deleting the change amount C that is the closest (for example, it is possible to compare all the change amounts C that are held with the decrease amount and have the smallest difference). When the amount C is managed and the increase / decrease processing signal F is output and the corrected change amount G of the increase / decrease correction unit 17 is acquired, the largest change amount C held is deleted and the corrected change amount G is newly changed. Retained as the amount C and rearranges the plural retained variation amounts C in order from the largest (if the increase / decrease correction unit 17 adds and corrects the largest variation amount C, the largest change before the correction) Since the corrected change amount G is larger than the amount C, a plurality The corrected change amount G is surely larger than the second largest change amount C. On the other hand, when the largest change amount C is subtracted and corrected, it is larger than the largest change amount C before correction. The corrected change amount G becomes smaller, so that the corrected change amount G may continue to be the largest change amount C, or the second largest change amount C that is held in plural. May be larger than the corrected change amount G (the change amount C up to the nth may be larger than the corrected change amount G depending on the magnitude of the correction amount subjected to the subtraction correction). It is necessary to register one corrected change amount G as one of the registered change amounts C, and then rearrange them in a large order, that is, 400 L / h, 350 L / h, 300 L / h, 200 L before correction. 4 variations of / h If a difference (correction amount) of 150 L / h is detected when the value is held, the corrected change amount is 400 L / h−150 L / h = 250 L / h, in which case the second largest change amount 350L / h of C is larger, and 300L / h of the third largest amount of change C is larger, and 350L / h, 300L / h, 250L / h, and 200L / h are obtained by reordering. When the difference (correction amount) is 20 L / h, 400 L / h−150 L / h = 380 L / h, and after realignment, 380 L / h, 350 L / h, 300 L / h, and 200 L / h. The corrected change amount G continues to be the largest change amount C), and after use, the usage time is extracted based on the largest change amount C that is held and the time measurement is started, and the increase / decrease calculation unit is again When the usage time elapses before the change amount C of 13 is acquired, the valve drive signal D is output.

  When the valve drive unit 15 receives the valve drive signal D from the increase / decrease determination unit 14, the valve drive unit 15 outputs a closing signal E.

  When the valve 16 receives the closing signal E from the valve driving unit 15, the valve 16 closes the gas passage.

  As described above, in the present embodiment, the corrected change amount G output from the increase / decrease correction unit 17 in the increase / decrease determination unit 14 is held as a new change amount C, and the flow rate B of the flow rate calculation unit 12 and the increase / decrease determination unit 14. It is possible to prevent wrinkles and divergences by matching with the sum of the plurality of change amounts C held by.

(Embodiment 2)
FIG. 1 shows a functional block diagram of a gas cutoff device according to Embodiment 2 of the present invention. In addition, since the thing of the symbol same as Embodiment 1 is the same function, description is abbreviate | omitted. Further, the increase / decrease correction unit 17 is not included in the second embodiment.

  When the change amount C of the increase / decrease calculation unit 13 is received, the constant increase / decrease correction unit 18 acquires the flow rate B of the flow rate calculation unit 12 and holds it as a reference value, and each time a new flow rate B of the flow rate calculation unit 12 is acquired, If there is no difference greater than or equal to the value, nothing is performed, and determination may be made with a difference greater than or equal to a predetermined value (for example, greater than or equal to a predetermined value (100 L / h). This is to restrict the change in the amount of gas used to the largest amount of change C, but if a fine correction is required, the determination itself of “above a predetermined value” may not be performed.) If there is a change, the change determination unit 14 acquires all the change amounts C, obtains the difference between the sum of the acquired change amounts C and the flow rate B of the flow rate calculation unit 12, and acquires the change amount C acquired from the increase / decrease determination unit 14. The largest change amount C (for example, the total gas consumption in FIG. Assuming that “Vessel 1” and “Vessel 3” were obtained when a difference greater than the value occurred (when the total amount of gas used (= flow rate B) decreased, the total amount of gas used and the gas shut-off device (increase / decrease) There is no difference from the sum of the change amounts C held by the determination unit 14), and thereafter the increase / decrease calculation unit 13 cannot detect the change, and the total gas consumption gradually decreases. The difference (correction amount) calculated in “device 3” because “device 1” and “device 3” are large) is corrected by adding and subtracting the corrected change amount G ( For example, in FIG. 2c, “container 3 + correction amount” is output, and the flow rate B of the flow rate calculation unit 12 is acquired again as a reference value.

  Although the increase / decrease determination unit 14 has acquired the corrected change amount G from the increase / decrease correction unit 17 in the first embodiment, it always acquires the corrected change amount G from the increase / decrease correction unit 18 and does not output the increase / decrease processed signal F. . Further, the usage time has elapsed before acquiring either the change amount C of the increase / decrease calculation unit 13 or the corrected change amount G of the constant increase / decrease correction unit 18 (for example, when only the largest change amount C is considered important). If the change amount C or the corrected change amount G does not become the largest change amount C, the timing may be continued), and the valve drive signal D is output.

  As described above, in the present embodiment, the increase / decrease determination unit 14 always holds the corrected change amount G output from the increase / decrease correction unit 18 as a new change amount C, and the constant increase / decrease correction unit 18 always maintains the flow rate calculation unit 12. It is possible to prevent wrinkles and divergence by matching the flow rate B and the sum of the plurality of change amounts C held by the increase / decrease determination unit 14.

  In the first and second embodiments, when the total gas usage is largely changed in the first embodiment, the total gas usage is different in the second embodiment when there is no large change in the total gas usage. It is possible to detect and correct the occurrence of a difference between the usage amount (= flow rate B) and the sum of the change amounts C held by the gas shut-off device, and it is possible to prevent the discrepancy.

  By this correction, the largest change amount C is deleted and the corrected change amount G is held as a new change amount C, so that the gas shut-off device holds more than the maximum amount of gas appliance actually used. The largest amount of change C may be larger, but even if it becomes larger, the time until the gas passage is closed is shortened. Can be secured.

  Note that a combination of the first embodiment and the second embodiment may be a third embodiment.

  As described above, the gas shutoff device according to the present invention maintains the actual total gas use amount and the gas shutoff device in combination with the estimation of the presence / absence of the use of the gas appliance by increasing / decreasing the total use amount of the conventional gas. If there is a discrepancy between the change amount and the sum of the changes, it can be corrected, and safety can be secured and convenience can be improved. It can also be applied to uses such as meters.

Functional block diagram of the gas shut-off device in the first and second embodiments of the present invention A diagram showing the gas usage pattern and the amount of change the gas shutoff device holds Functional block diagram of a conventional gas shut-off device

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Flow rate detection part 12 Flow rate calculation part 13 Increase / decrease calculation part 14 Increase / decrease determination part 15 Valve drive part 16 Valve 17 Increase / decrease correction part 18 Constant increase / decrease correction part

Claims (1)

A flow rate detector that outputs a flow rate signal corresponding to the gas flow rate passing through the gas passage ;
A flow rate calculation unit for calculating a flow rate upon receiving the flow rate signal,
When the flow rate of the flow rate calculation unit is received, the flow rate value acquired last time is compared with the flow rate acquired this time, and if there is no change, nothing is performed, and if there is a change, an increase / decrease calculation unit that outputs the change amount When,
Held as the amount of change which the increase and decrease calculation unit has output holds by adding the amount of change as you start using the new gas appliance if the increase was stopped using gas appliance if reduction and decrease determination unit for outputting a decrease processed signal to manage the amount of change several while deleting the most proximal correct variation in you are,
Upon receiving the increase / decrease processed signal, all the variation amounts held by the increase / decrease determination unit are acquired, the sum of the acquired variation amounts is compared with the flow rate of the flow rate calculation unit, and a difference greater than or equal to a predetermined value is obtained. If there is no difference, the increase / decrease correction unit outputs the corrected change amount by adding / subtracting the calculated difference to the largest change amount acquired from the increase / decrease determination unit if there is a difference greater than or equal to ,
A valve drive unit that outputs a closing signal upon receiving a valve drive signal from the increase / decrease determination unit ;
And a valve for plugging the gas passage receives the plugging signal,
The increase / decrease determination unit deletes the largest change amount held when acquiring the corrected change amount, holds the corrected change amount as a new change amount, and stores a plurality of change amounts. Sort the order from largest to smallest, extract the usage time based on the largest amount of change that is retained after the adjustment, start timing, and use the usage time before acquiring the amount of change in the increase / decrease calculation unit again A gas shut-off device that outputs a valve drive signal when the time elapses .