JPH11190447A - Gas shutoff device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To normally close a gas passage and to instantaneously open a gas passage during the use of gas. SOLUTION: An instantaneous flow rate deciding part 9 calculates an instantaneous flow rate value I from an instantaneous flow rate H detected by an instantaneous flow rate detecting part 8 to output a result. An external communication means 11 effects communication J to transmit a combustion demand signal K when a start of combustion is demanded from an external apparatus 10 and permit combustion when a combustion permission signal M is received. A combustion start deciding part 12 outputs an opening signal E and a combustion advisability decision signal L when the combustion demand signal K is received. The combustion permission deciding part 13 receives the combustion permission decision signal L. When a receipt instantaneous flow rate value I is available, a closing signal C is outputted and when the value is unavailable, the combustion permission signal M is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off device for ensuring safety when using gas after a gas meter. In particular, it relates to a gas passage opening / closing plug.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 9, in a gas shut-off device of this kind, a flow rate detecting section 1 outputs a flow rate pulse A when a predetermined amount of gas passes through a gas passage, and a flow rate determining section 2
Receives the flow rate pulse A of the flow rate detector 1 and calculates a flow rate value B. The abnormal flow rate determination section 3 determines the flow rate value B of the flow rate determination section 2 and determines the predetermined value which the flow rate value B holds in advance. If it has exceeded, the plugging signal C is output and the valve driving unit 4
Outputs a valve closing drive signal D when receiving the plugging signal C, and outputs a valve opening driving signal F when receiving the opening signal E.

The valve 5 closes the gas passage when receiving the valve closing drive signal D of the valve driving unit 4 and opens the gas passage when receiving the valve opening driving signal F, and the return signal input unit 6 controls the valve of the valve driving unit 4. When there is a return input after receiving the closing drive signal D, an opening signal E and a leak determination signal G are output, and the gas leak determination unit 7 determines the flow rate after receiving the leak determination signal G from the return signal input unit 6. If the flow value B of the section 2 is present, the plugging signal C is output.

[0004]

However, in the conventional gas shut-off device, the gas measuring method generates a flow pulse A when a fixed amount of gas passes through the gas passage, and the gas is generated based on the flow pulse A. Used (leaked)
Therefore, when the gas is finely used (for example, when a pilot flame is lit), the presence or absence of the flow pulse A must be monitored for a long time (for example, 60 minutes). .

Conversely, also at the time of a gas leak inspection performed when the gas passage is changed from the closed state to the open state by the return of the valve, it takes time (for example, 2 hours) to detect a minute gas leak.
Minutes).

[0006] These two reasons (it takes time to measure the gas flow rate both for detecting when the gas is not used and for opening the gas passage), and taking into account the convenience of the user ( When the gas is not used, the gas passage must always be kept open even when the gas is not used.

[0007] Because of this, since the gas passage is always open, it is not possible to prevent a minute gas leak between the gas shut-off device and the combustion appliance, which does not affect the above-mentioned gas leak determination, or when the gas is not used. (However, except when closing the gas passage)
When the battery which is the power supply of the gas shut-off device is rapidly consumed due to short circuit and the like and the ability to close the gas passage is rapidly lost, the gas passage is closed when the battery voltage drops (because the function of the original gas cut-off device does not work) The gas passage was closed before the battery was exhausted for the purpose of ensuring the safety of the user.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an instantaneous flow rate detecting unit which instantaneously obtains the flow of gas in a gas passage to determine whether or not gas is used and to determine whether gas is leaking. It is possible to instantaneously determine,
When the gas is not used, the gas passage can be closed immediately, and when the gas device is to be started to be used by the external communication means, the gas passage can be immediately opened to make the gas usable.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An instantaneous flow rate detecting section for measuring an instantaneous flow rate of a gas flowing in a gas passage, and an instantaneous flow rate value is calculated from the instantaneous flow rate of the instantaneous flow rate detecting section. The instantaneous flow rate determining unit that outputs a plugging signal at the time of, and the instantaneous flow rate determining unit determines the instantaneous flow rate value, and determines that the instantaneous flow rate value exceeds a predetermined value held in advance. An abnormal flow rate determination unit that outputs a valve closing drive signal when receiving the plugging signal, and outputs a valve opening drive signal when receiving the plugging signal; and the valve closing drive signal of the valve driving unit. The valve that closes the gas passage upon receipt of the valve and opens the gas passage when the valve opening drive signal is received, and the opening signal and the leakage when there is a return input after receiving the valve closing drive signal of the valve drive unit. Output the judgment signal A signal input unit, a gas leak determination unit that outputs the plugging signal if there is the instantaneous flow rate value of the instantaneous flow rate determination unit after receiving the leak determination signal of the return signal input unit, and combustion start from an external device. An external communication unit that outputs a combustion request signal when requested and receives a combustion permission signal and communicates with an external device that notifies the external device of permission to start burning, and the combustion request signal of the external communication unit. A combustion start determination unit that outputs the opening signal and a combustion feasibility determination signal when received, and if the instantaneous flow rate determination unit has the instantaneous flow rate value after receiving the combustion feasibility determination signal of the combustion start determination unit, It has a combustion permission determining unit that outputs a plugging signal and outputs the combustion permission signal if the instantaneous flow rate value does not exist.

Also, a flowless timer unit for outputting the plugging signal by judging that the instantaneous flow value is equal to or less than a predetermined value for a certain period of time upon receipt of the closing signal from the instantaneous flow determining unit is added. It is.

A gas use time learning unit for receiving the instantaneous flow rate value of the instantaneous flow rate determination unit and storing a gas use time zone, and an optional gas use time before the gas use time zone of the gas use time learning unit. And a use start timer unit for outputting the opening signal when the time is reached.

Further, an instantaneous flow rate detector for measuring the instantaneous flow rate of the gas flowing in the gas passage, and an instantaneous flow rate value calculated from the instantaneous flow rate of the instantaneous flow rate detector, wherein the instantaneous flow rate value is less than a certain value. When the instantaneous flow rate determination unit that outputs the plugging signal, and when the instantaneous flow rate value of the instantaneous flow rate determination unit is determined and the instantaneous flow rate value exceeds a predetermined value held in advance, the plugging signal is output. An abnormal flow rate determination unit to output, a valve driving unit that outputs a valve closing drive signal when receiving the plugging signal and outputs a valve opening driving signal when receiving an opening signal, and the valve closing driving signal of the valve driving unit. A valve that closes the gas passage when received and opens the gas passage when the valve opening drive signal is received, and when the return input is received after receiving the valve closing drive signal of the valve drive unit, the open signal and the leak determination are made. Output signal A return signal input unit, a gas leak determination unit that outputs the plugging signal if the instantaneous flow rate value of the instantaneous flow rate determination unit is received after receiving the leak determination signal of the return signal input unit, and combustion from an external device. An external communication means for outputting a combustion request signal when requested to start and receiving a combustion permission signal and communicating with an external device that notifies the external device of permission to start combustion, and measuring a pressure in a gas passage to measure gas pressure. A pressure detection unit that outputs a pressure value, a pressure learning unit that stores the gas pressure value of the pressure detection unit and outputs a gas pressure fluctuation range, and after acquiring the plugging signal, after holding the shutoff gas pressure value. The shutoff pressure holding unit that outputs the plugging signal, and the gas pressure value of the pressure detection unit and the shutoff gas pressure value of the shutoff pressure holding unit when the combustion request signal of the external communication unit is received. When the difference is equal to or less than an arbitrary value and the gas pressure value is included in the gas pressure fluctuation range of the pressure learning unit, a return pressure determination unit that outputs the opening signal and the combustion permission signal is provided. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a functional block diagram of a gas shut-off device according to Embodiment 1 of the present invention. FIG. 2 (a),
(B) is a program flowchart of the first embodiment.

In FIG. 1, an instantaneous flow rate detector 8 measures a gas flow rate in a gas passage and outputs an instantaneous flow rate H corresponding to the gas flow rate.

The instantaneous flow rate determining section 9 calculates an instantaneous flow rate value I based on the instantaneous flow rate H measured by the instantaneous flow rate detecting section 8. When the instantaneous flow rate H is equal to or less than a certain value (for example, when the instantaneous flow rate is equal to or less than the pilot flow rate of the gas appliance, it is determined that the gas is not used), and the plugging signal C is output.

The abnormal flow rate judging section 3 determines whether the instantaneous flow rate I of the instantaneous flow rate judging section 9 has a predetermined value (maximum measured amount of the gas shut-off device or gas usage for each gas flow rate permitted by the gas shut-off device). (Duration time, etc.), the plugging signal C is output.

The valve driving section 4 outputs a valve closing driving signal D when receiving the plugging signal C, and outputs a valve opening driving signal F when receiving the plugging signal E. When the valve 5 receives the valve closing drive signal D, it closes the gas passage and stops the gas supply, and when it receives the valve opening drive signal F, opens the gas passage to make the gas usable.

After receiving the valve closing drive signal D, the return signal input unit 6 receives a return input for opening the gas passage (for example, an input from a push switch or the like).
And a leakage determination signal G is output.

The gas leak judging section 7 receives the leak judging signal G from the return signal input section 6 and then outputs the instantaneous flow rate I of the instantaneous flow judging section 9 (for example, if the average of two consecutive instantaneous flow rates is not zero). ), A closure signal C is output.

The external communication means 11 performs communication J with the external device 10. As communication, when a request to start combustion is issued from the external device 10 (for example, a signal is output from the external device 10 when the external device 10 attempts to start combustion through a wired or wireless connection), a combustion request signal K is output, and combustion is performed. Upon receiving the permission signal M, the external device 10 performs communication for permitting combustion. For example, a combustion start permission signal or a combustion start disable signal is output to the external device 10 through a wired or wireless connection.

Upon receiving the combustion request signal K from the external communication means 11, the combustion start judging section 12 opens the gas passage and checks the presence or absence of a gas flow rate in a state where the gas has not been used yet to detect a gas leak. The presence / absence can be determined), and an opening signal E and a combustion determination signal L are output.

The combustion permission judging section 13 comprises a combustion start judging section 12
When the combustion permission / inhibition determination signal L is received, the gas passage is already opened before the determination of the start of combustion. If the gas is used, the combustion permission signal M is output immediately. When the gas passage is opened simultaneously with the determination of the start of combustion, if the instantaneous flow rate value I of the instantaneous flow rate determination unit 9 is present (for example, if the average of the instantaneous flow rate values of two consecutive times is not zero), the closing signal C is output. If there is no flow value I, a combustion permission signal M is output.

Next, the operation and operation will be described.
(A) and (b) show the program flow of the above means from S0 to S36. Now, it is assumed that the flow from the process start to the process end is periodically processed by an interval calendar or the like. Instantaneous flow rate determination unit 9 of gas shutoff device
In step S0, the process proceeds to step S1 if the determination of the start of combustion is not requested from the external device 10, and to step S7 if the determination of the start of combustion is requested.

In the process S2, if a return input (for example, an input by a push switch) is inputted and the gas leak is not determined, the process shifts to the process S2. If the gas leak is determined, the process S7 is performed.
Move to. The process S2 calculates an instantaneous flow value (for example, an average of two consecutive instantaneous flow values to smooth out minute fluctuations) from the instantaneous flow detected by the instantaneous flow detection unit 8,
If the instantaneous flow rate value is equal to or less than a certain value (for example, if the instantaneous flow rate is equal to or less than the pilot flow rate of the gas appliance, it is determined that the gas is not used), and the process proceeds to step S3. If the instantaneous flow rate value is equal to or more than a certain value, the process proceeds to step S6. In step S3, the process proceeds to step S4 if the valve has not already closed the gas passage, and to step S7 if the valve is closed. Valve drive unit 4
In step S4, a plugging signal is output, and the process proceeds to step S5. In the valve 5, the process S5 closes the gas passage and the process S7.
Move to.

A predetermined value (a maximum measured amount of the gas shut-off device, a gas use continuation time for each gas flow allowed by the gas shut-off device, etc.) held in advance in the abnormal flow rate determination section 3.
If the value exceeds the predetermined value, the process proceeds to step S4, and if not, the process proceeds to step S7.

In the external communication means 11, the process S7 proceeds to the process S8 if the combustion start determination has not been requested, and proceeds to the process S16 if the combustion start determination has been requested. The process S8 monitors the presence / absence of a request for starting combustion from the external device 10. If there is a request for starting combustion, the process proceeds to step S9. If not, the process proceeds to step S21.

The process S9 in the combustion start judging section 12 judges whether the gas passage has already been opened (if the gas passage has been opened, another gas appliance has already been used, or the gas leak has been judged by the return input). Is determined), and
If the plug has been opened, the process proceeds to step S10, and if not, the process proceeds to step S13.

In the process S10 in the combustion permission judging section 13, the process S1 is executed unless the return input is inputted and the gas leakage is not judged.
Then, the process proceeds to S1 if the gas leakage is being determined. The process S11 permits the start of combustion and proceeds to the process S12. The process S12 ends the request process of the combustion start determination, and shifts to the process S21.

The process S13 in the combustion start judging section 12 permits the request process of the combustion start judgment, and proceeds to the process S14. In step S14, the valve driving unit 4 outputs an opening signal, and the process proceeds to step S15. In the valve 5, the process S15 opens the gas passage and shifts to the process S21.

In the combustion permission judging section 13, the process S16 judges the presence or absence of an instantaneous flow rate value. It is determined that there is a gas leak or that the gas cock or the gas appliance is in an open state on the downstream side of the gas shutoff device, and the process proceeds to step S17. If no gas is flowing, the process proceeds to step S19.

In step S17, the valve driving section 4 outputs a plugging signal, and the process proceeds to step S18. Processing S1 at valve 5
8 closes the gas passage and shifts to processing S20.

In the process S19 in the combustion permission judging section 13, the start of the combustion is permitted, and the process proceeds to the process S20. Processing S20
Ends the combustion start determination request process and shifts to process S21.

In the process S21 in the return signal input section 6, the process proceeds to a process S22 if the return input has not already been input and the gas leak is not being determined, and to the process S27 if the gas leak is being determined. In step S22, the process proceeds to step S23 if the valve has closed the gas passage, and to step S31 otherwise. The process S23 is a process S23 when a return input is input.
24, and if no return input is input, the process proceeds to step S31.
Move to. The process S24 starts the gas leak determination process, and proceeds to the process S25.

In step S25, the valve driving section 4 outputs an opening signal, and the process proceeds to step S26. Processing S2 at valve 5
In step 6, the gas passage is opened, and the process proceeds to step S31.

The gas leak judging section 7 judges the presence or absence of the instantaneous flow rate value in the step S27. If the gas is flowing (for example, if the average of the instantaneous flow rate values of two consecutive times is not zero), the gas leak is determined. It is determined that there is a gas leak or that the gas cock or the gas appliance is in an open state on the downstream side of the gas shutoff device, and the process proceeds to step S28. If no gas is flowing, the process proceeds to step S30.

In step S28, the valve driving section 4 outputs a plugging signal, and the flow advances to step S29. Processing S2 at valve 5
No. 9 closes the gas passage and shifts to processing S30. In the gas leak determination unit 7, the process S30 ends the gas leak determination process, and proceeds to the process S31.

In the external communication means 11, the process S31 shifts to the process S32 if the combustion start determination has been completed, and the process is ended if the combustion start determination has not been completed. Processing S
32 determines whether or not the start of combustion of the gas appliance is permitted. If there is permission to start combustion, the process proceeds to step S33, and if there is no permission to start combustion, the process proceeds to step S35. The process S33 communicates the permission of combustion to the external device 10 (for example, wired or wireless), and proceeds to the process S34.

In step S34, the permission to start combustion is cleared, and the routine goes to step S36. The process S35 communicates the non-combustibility to the external device 10 and proceeds to the process S36. In the process S36, the request process for the determination of the start of combustion is ended, and the process is ended.

(Embodiment 2) FIG. 3 is a functional block diagram of a gas shut-off device according to Embodiment 2 of the present invention. FIG. 4 is a program flowchart of the second embodiment. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

The difference from the first embodiment is that, in the functional block diagram of FIG.
Is received for a certain period of time (for example, 1
By setting the time to 0 minutes, the gas passage is not opened and closed each time the gas equipment is used, and the time lag associated with the gas use start permission determination is eliminated after the temporary use of the continuous gas is stopped.) It determines that the flow rate is equal to or less than a predetermined value (the instantaneous flow rate value is not zero), and outputs a plugging signal C.

Next, the operation and operation will be described in detail with reference to FIG. 4 (a) and 4 (b) show the program flow of the above means from S0 to S40. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

It should be noted that the process S2 shifts to the process S37 if the instantaneous flow rate value is equal to or more than a certain value, and the process S3 shifts to the process S38 if the valve has not already closed the gas passage. The process S37 in the instantaneous flow rate determination section 9 clears the non-flow rate timer counter for measuring the time during which the gas flow rate is not flowing, and proceeds to the process S6.

In the flowless timer section 14, the process S38 counts the flowless timer counter, and the process shifts to the process S39. In step S39, it is determined whether or not the non-flow rate timer counter has counted up.
The process shifts to 40, and if not counted up, the process S7.
Move to. The process S40 clears the no-flow-rate timer counter and shifts to the process S4.

(Embodiment 3) FIG. 5 is a functional block diagram of a gas shut-off device according to Embodiment 3 of the present invention. FIG. 6 is a program flowchart of the third embodiment. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

The difference from the first embodiment is that the gas use time learning unit 15 monitors the instantaneous flow rate value I of the instantaneous flow rate judgment unit 9 and learns the gas use start time N in the functional block diagram of FIG. For example, the same time for three consecutive days (error within 5 minutes)
If the use of gas is started, the gas use start time is registered. If gas is not used for three consecutive days at the registered time when the gas use start time is registered (within 5 minutes), the life pattern has changed. To delete the gas use start time.

Based on the internal clock of the gas shut-off device, the use start timer section 16 immediately before the gas use start time N of the gas use time learning section 15 (for example, by setting it to 10 minutes before, the time at which gas use is started slightly) When the gas passage is in the closed state, the opening signal E is output.

Next, the operation and operation will be described in detail with reference to FIG. 6 (a) and 6 (b) show the program flow of the above means from S0 to S49. Where S
37 to S40 are missing numbers. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

Processing S4 in gas usage time learning section 15
In step 1, the process proceeds to step S <b> 42 if the start of combustion determination is not requested from the external device 10, and to step S <b> 46 if the start of combustion determination is requested. In the process S42, the process shifts to a process S43 if the return input is input and the gas leak determination is not being performed, and to the process S46 if the gas leak determination is being performed.

In step S43, it is determined whether or not there is an instantaneous flow rate value. If the gas is flowing (for example, if the average of two consecutive instantaneous flow rate values is not zero), the process proceeds to step S44. Move to S45. The process S44 holds the gas use start time (for example, if the gas use is started at the same time (within an error of 5 minutes) for three consecutive days, the gas use start time is registered), and the process proceeds to the process S46.

In step S45, the gas use start time is deleted (if gas is not used for three consecutive days at the registered time at which the gas use start time is registered (within 5 minutes), it is determined that the life pattern has changed and the gas use start time is changed. The time is deleted), and the process shifts to step S46.

Processing S46 in use start timer section 16
If the valve has not opened the gas passage, the process proceeds to step S47, and if the valve has been opened, the process ends. In step S47, it is determined based on the internal clock of the gas shut-off device whether or not the gas use start time has come just before (for example, if the gas use start time is slightly shifted by 10 minutes before, it can be corrected). If it is immediately before, the process proceeds to step S48, and if not, the process ends. Process S48 in the valve drive unit 4
Outputs an opening signal and proceeds to step S49. In the valve 5, the process S49 opens the gas passage and terminates the process.

(Embodiment 4) FIG. 7 is a functional block diagram of a gas shut-off device according to Embodiment 4 of the present invention. FIG. 8A,
(B) is a program flowchart of the fourth embodiment.
The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

The difference from the first embodiment is that in the functional block diagram of FIG.
3 is deleted, and in the functional block diagram of FIG. 7, the pressure detecting unit 17 acquires the gas pressure value O in the gas passage by the pressure sensor.

The pressure learning section 18 learns the gas pressure fluctuation range P from the gas pressure value O. For example, in order to obtain the maximum value of the gas pressure, learning is performed when the same pressure value exceeds the currently held maximum value three times in succession. Thereafter, the gas pressure value is monitored, and if the registered gas pressure value does not reappear within 30 days, the gas pressure value is returned to the previous gas pressure value.

When the shutoff pressure holding unit 19 receives the closing signal C, it acquires the gas pressure value O of the pressure detecting unit 17, holds the shutoff gas pressure value Q, and outputs the closing signal C.

Upon receiving the combustion request signal K from the external communication means 11, the return pressure determining section 20 receives the combustion request signal K from the external communication means 11, and the difference between the gas pressure value O of the pressure detecting section 17 and the shutoff gas pressure value Q of the pressure learning section 18 is equal to or less than a certain value ( If the gas pressure value O of the pressure detection unit 17 is within the gas pressure fluctuation range P of the pressure learning unit 18, there is no gas leakage due to a scratch in the gas passage, or the gas shutoff device On the downstream side, it is determined that the gas cock or the gas appliance is not in the open state, and the combustion permission signal M is output, and the difference between the gas pressure value O and the shutoff gas pressure value Q is equal to or greater than a certain value or the gas pressure value O Is outside the gas pressure fluctuation range P, a plugging signal C is output.

Next, the operation and operation will be described in detail with reference to FIGS. 8 (a) and 8 (b).

FIGS. 8A and 8B show the program flow of the above means from S0 to S60. However, from S7 to S2
0 and S37 to S49 are skipped. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted. It is assumed that all the processes that have been shifted to the process S7 because the process S7 is missing are shifted to the process S50.

In step S50, the pressure detecting section 17 acquires the gas pressure value in the gas passage from the pressure sensor, and executes step S5.
Move to 1.

In the pressure learning section 18, the process S51 shifts to a process S52 if the valve has opened the gas passage, and shifts to a process S53 if the valve has not been opened. The process S52 is performed in a gas pressure fluctuation range (for example, to obtain the maximum value of the gas pressure, 3
Learning is performed when the current pressure value exceeds the currently held maximum value at the same pressure value consecutively. Thereafter, the gas pressure value is monitored, and if the registered gas pressure value does not reappear within 30 days, the gas pressure value is returned to the previous gas pressure value), and the process proceeds to step S53.

Process S53 in the pressure holding unit 19 during shutoff
Moves to step S54 if there is a plugging output, and moves to step S55 if there is no plugging output. In step S54, the process proceeds to step S55 while maintaining the shutoff gas pressure value.

Process S55 in the return pressure determination section 20
The process proceeds to step S56 if the start of combustion determination has been requested from the external device 10, and the process proceeds to step S60 if the start of combustion determination has not been requested. In step S56, if the plug is being opened, the process proceeds to step S59.
Go to 57.

In step S57, when the difference between the gas pressure value of the pressure detecting section 17 and the gas pressure value at the time of shutoff of the pressure learning section 18 is equal to or less than a certain value (for example, 10 mmH2O or less), the processing shifts to step S58. If the difference between the hour gas pressure values is equal to or more than a certain value, the process proceeds to step S60.

In step S58, if the gas pressure value of the pressure detecting section 17 is within the range of the gas pressure fluctuation range of the pressure learning section 18, the process proceeds to step S59, and if the gas pressure value is out of the range of the gas pressure fluctuation range. Move to processing S60. The process S59 permits the start of combustion and proceeds to the process S60. The process S60 ends the request process for the determination of the start of combustion and ends the process.

[0066]

As apparent from the above description, the following effects can be obtained according to the gas shut-off device of the present invention.

According to the first aspect of the present invention, when the gas is not used, the gas passage is always closed, and when the gas is used, the gas leak is determined instantaneously, and after confirming that there is no leak in the gas passage, the gas passage is closed. Can be opened. Accordingly, it is not necessary to always keep the gas passage in the open state, so that it is possible to prevent minute gas leakage caused by cracks in the gas passage. Except for gas leakage due to insufficient sealing of the valve section for closing the gas passage, only the amount of gas trapped in the gas passage between the gas appliances from the gas shut-off device can be reduced.

Further, since the gas passage is always closed, even if the battery, which is the power supply of the gas shut-off device, is rapidly consumed, the user can operate after the battery voltage drops (the function of the gas shut-off device is not operating). There is an advantageous effect that the use of gas in an unmanaged state can be prevented and safety can be improved.

According to the second aspect of the present invention, by delaying the closing of the gas passage when the gas is not used, when the gas appliance is temporarily stopped and the gas appliance is used again,
It is possible to eliminate the instantaneous gas leak determination time at the start of gas use (instantaneously, but a slight time lag occurs), thereby improving user convenience.

Further, the number of times of opening and closing the gas passage can be reduced, so that useless consumption of the battery can be suppressed.
This allows the battery to be designed to have a small capacity, and by using a small battery, the size of the gas shut-off device can be reduced, or the life of the product can be extended even if a battery of the same capacity is used. This has the advantageous effect that it can be performed.

Further, according to the third aspect of the present invention, the life pattern of the user using the gas can be held, and the gas passage can be opened before starting use of the gas appliance based on this life pattern. . Further, by combining with the present invention 2, it is possible to prevent the gas passage from being closed immediately even if the life pattern slightly shifts and the gas use start time is delayed.

As a result, it is possible to eliminate the instantaneous gas leak determination time at the time of starting gas use (instantaneous but slight time lag occurs), and it is convenient for the user and the gas passage is always closed. Security can be achieved at the same time.

Further, according to the fourth aspect of the present invention, it is possible to confirm that there is no gas leakage by determining the difference between the gas pressure in the gas passage at the time of shutoff and the gas pressure in the gas passage immediately before the gas passage is opened. The gas passage can be opened immediately at the start of use, and both user convenience and safety can be ensured by always closing the gas passage.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a gas cutoff device according to a first embodiment of the present invention.

FIG. 2A is a program flowchart of the same apparatus. FIG. 2B is a program flowchart following the same apparatus.

FIG. 3 is a functional block diagram of a gas cutoff device according to a second embodiment of the present invention.

FIG. 4A is a program flowchart of the same apparatus. FIG. 4B is a program flowchart following the same apparatus.

FIG. 5 is a functional block diagram of a gas cutoff device according to a third embodiment of the present invention.

FIG. 6A is a program flowchart of the same device. FIG. 6B is a continuation of a program flowchart of the same device.

FIG. 7 is a functional block diagram of a gas cutoff device according to a fourth embodiment of the present invention.

FIG. 8A is a program flowchart of the same apparatus. FIG. 8B is a program flowchart following the same apparatus.

FIG. 9 is a functional block diagram of a conventional gas shut-off device.

[Explanation of symbols]

 3 Abnormal flow rate determination section 4 Valve drive section 5 Valve 6 Return signal input section 7 Gas leak determination section 8 Instantaneous flow rate detection section 9 Instantaneous flow rate determination section 10 External device 11 External communication means 12 Combustion start determination section 13 Combustion permission determination section 14 Flow rate Non-timer unit 15 Gas use time learning unit 16 Start of use timer unit 17 Pressure detection unit 18 Pressure learning unit 19 Pressure holding unit at shutoff 20 Return pressure judgment unit

Claims (4)

[Claims] An instantaneous flow rate detector for measuring an instantaneous flow rate of gas flowing in a gas passage; an instantaneous flow rate determination section for outputting a plugging signal when an instantaneous flow rate value of the instantaneous flow rate detector is less than a certain value; When the instantaneous flow rate determination unit determines that the instantaneous flow value exceeds a predetermined value held in advance, an abnormal flow rate determination unit that outputs a plugging signal, and outputs a valve closing drive signal when a plugging signal is received. A valve driving unit that outputs a valve opening drive signal when receiving an opening signal, a valve that closes a gas passage when receiving a valve closing drive signal of the valve driving unit, and opens a gas passage when receiving a valve opening driving signal. When a return input is received after receiving the valve closing drive signal of the valve drive unit, a return signal input unit that outputs an open signal and a leak determination signal, and after receiving the leak determination signal of the return signal input unit. The instantaneous flow rate determination unit A gas leak determination unit that outputs a plugging signal if there is an instantaneous flow rate value, and when a combustion start is requested from an external device, outputs a combustion request signal and receives a combustion permission signal, and notifies the external device of permission to start combustion. An external communication unit that communicates with the external device; a combustion start determination unit that outputs a plugging signal and a combustion feasibility determination signal when receiving a combustion request signal from the external communication unit; A gas shutoff device that outputs a plugging signal if the instantaneous flow rate value of the instantaneous flow rate determination unit is present after receiving the determination signal, and outputs a combustion permission signal if there is no instantaneous flow rate value. 2. A flow rate non-timer section for outputting a plugging signal upon judging that the instantaneous flow rate value is equal to or less than a predetermined value for a certain period when receiving the plugging signal from the instantaneous flow rate determining section. Gas shut-off device. 3. A gas use time learning unit for receiving an instantaneous flow rate value of an instantaneous flow rate determination unit and storing a gas use time zone, and at an arbitrary time before reaching the gas use time zone of the gas use time learning unit. 2. The gas shut-off device according to claim 1, further comprising a use start timer unit that outputs an opening signal when the operation is completed. 4. An instantaneous flow rate detector for measuring an instantaneous flow rate of gas flowing in a gas passage, an instantaneous flow rate determiner for outputting a plugging signal when an instantaneous flow rate value of the instantaneous flow rate detector is less than a certain value, When the instantaneous flow rate determination unit determines that the instantaneous flow value exceeds a predetermined value held in advance, an abnormal flow rate determination unit that outputs a plugging signal, and outputs a valve closing drive signal when a plugging signal is received. A valve driving unit that outputs a valve opening drive signal when receiving an opening signal, a valve that closes a gas passage when receiving a valve closing drive signal of the valve driving unit, and opens a gas passage when receiving a valve opening driving signal. When a return input is received after receiving the valve closing drive signal of the valve drive unit, a return signal input unit that outputs an open signal and a leak determination signal, and after receiving the leak determination signal of the return signal input unit. The instantaneous flow rate determination unit A gas leak determination unit that outputs a plugging signal if there is an instantaneous flow rate value, and when a combustion start is requested from an external device, outputs a combustion request signal and receives a combustion permission signal, and notifies the external device of permission to start combustion. External communication means for communicating with the external device, a pressure detection unit for measuring the pressure in the gas passage and outputting a gas pressure value, and storing the gas pressure value of the pressure detection unit and outputting a gas pressure fluctuation range. A pressure learning unit, a shutoff pressure holding unit that outputs a plugging signal after holding a shutoff gas pressure value when a plugging signal is obtained, and a gas of the pressure detection unit when a combustion request signal of the external communication unit is received. When the difference between the pressure value and the shutoff gas pressure value of the shutoff pressure holding unit is equal to or less than an arbitrary value and the gas pressure value is included in the gas pressure fluctuation range of the pressure learning unit, the opening signal and the combustion permission are issued. Output signal Return the pressure determination unit gas cutoff apparatus having a.