JPH0325028Y2 - - Google Patents

Description

[Detailed explanation of the invention] ● Industrial application field This invention monitors the usage status of gas appliances from the flow rate of gas flowing to the consumer, and the flow rate that matches the preset gas consumption amount is determined as the flow rate. When detected by the measuring device, a timer is started to measure the amount of time this flow continues to flow, and when this measured time exceeds a preset safe continuous use time, it is determined to be dangerous and an emergency shutoff valve is activated. This relates to a gas accident prevention device that sends a shut-off signal to shut off the gas supply.

● Prior art and its problems In gas accident prevention devices, when the number of gas appliances increases or decreases, it becomes necessary to change the abnormal flow rate judgment value or the set value of the safe continuous use time in the control circuit (microcomputer).

As shown in Fig. 3, this conventional changing means removes the set screw 02 of the lid covering the control circuit with a screwdriver, and when changing the abnormal flow rate judgment value, a binary rotary switch provided on the printed circuit board is used. 01 by changing the position using a screwdriver or the like. Further, the setting of the safe continuous use time is changed by pulling out the jumper wire 04 and connecting it to the time extension terminal 03.

Therefore, it takes time to remove and reattach the lid, and since the contacts of the rotary switch 01 and the terminal 03 are physical contacts, there are concerns about reliability over time.

● Purpose of the present invention The present invention is proposed in view of the above points.
The purpose of the present invention is to propose a gas accident prevention device that allows setting values to be changed while the control circuit is covered.

● Structure of the present invention The present invention is a technical means to achieve the above purpose.
A supply gas flow measuring device installed in the gas supply line and a supply gas emergency shutoff valve installed in the gas supply line and, depending on the gas consumption, the continued use safety of a single gas appliance. The time can be stored in advance, and the overall gas flow rate value is measured at regular intervals using the flow rate measuring device, and if an increase is observed between the previous value and the current value,
The increase is taken as the consumption amount of one gas appliance newly started to be used, and if a decrease is recognized, the use of the gas appliance whose consumption is closest to the decrease is assumed to be stopped. The gas consumption of each appliance being used can be determined, and when it is detected by the method that a new gas appliance has started to be used that has a larger gas consumption than any of the appliances currently in use. We will continue to measure the continuous use time as long as the appliance is allowed to continue to be used, and if this measured time exceeds the safe continuous use time of the gas appliance, it will be determined that there is an abnormality. A closing signal is issued to the emergency shutoff valve, or the continuous use time of each gas appliance currently being used at the same time is continuously measured, and during this continuous use safe time, the corresponding continuous use is first stopped. If the time exceeds the specified time, it will be determined that there is an abnormality and a shut-off signal will be issued to the emergency shutoff valve, or if there is a change in the overall flow rate of the supplied gas, the continuous use time will be measured and the next step will be taken. When the continuous use time of the same flow rate until a change occurs exceeds the memorized continuous use safe time for the gas consumption of the maximum gas consumption appliance in use, a close signal is issued to the emergency shutoff valve. In a gas accident prevention device consisting of a control circuit configured as described above, the control circuit reads a reed switch and the ON/OFF pattern of the reed switch, determines the ON/OFF pattern, and determines whether or not the control circuit continues to use the reed switch. Change the safety time setting,
A circuit for selecting an appropriate constant among different constants for each measurement unit of the flow rate measuring device is provided, and a setting device with an electromagnet that continuously creates a magnetic field by turning on and off a switch button is provided. The present invention proposes a set value changing device for a gas accident prevention device, which is configured to turn on and off a magnetic field brought close to the reed switch.

According to the set value changing device described above, the electromagnet of the setting device is brought close to the reed switch and the switch button is operated to turn the electromagnet on and off.
The control circuit determines each set value based on the ON/OFF pattern of the reed switch that operates in the OFF state, and it is possible to change, add, or abolish each set value.

● Embodiment Figure 1 shows an embodiment of the present invention, in which 1 is a gas accident prevention device, 2 is a reed switch built into this device 1, and 3 is a control circuit. The safe continuous use time of each single gas appliance can be memorized in advance according to the consumption of gas, and the use of the gas appliance with the highest gas consumption currently in use can be detected by flow measurement. The device starts measuring time from the time when the gas appliance is used, and when the measured time exceeds the safe continuous use time of the gas appliance, it is determined that there is an abnormality and a signal is sent to the emergency shutoff valve to close it. Further, this control circuit 3 reads the ON/OFF pattern of the reed switch 2, determines the abnormal flow rate setting value and the continuous use safe time setting value from this ON/OFF pattern, and can change the respective setting values. .

Reference numeral 4 designates an operating device for changing each setting value of the control circuit 3, and this operating device 4 includes a keyboard (operating switch) 6 and an electromagnet 5 whose power is turned on and off in a certain pattern by operating the keyboard 6. , a control circuit 7 , a phototransistor 9 ,
It consists of a display 10.

Next, an example of changing the set value on the control circuit 3 side using the operating device 4 will be explained. First, the electromagnet 5 of the operating device 4 is brought close to the reed switch 5 of the control circuit 3,
Type on the keyboard 6 in a predetermined pattern. When the keyboard 6 is typed, the power is turned on and off, and the electromagnet 5 is turned on and off in accordance with the pattern typed on the keyboard 6. This ON,
Since the magnetic field turns ON and OFF in the same pattern due to OFF, the reed switch 2 turns ON and OFF in the same pattern due to this magnetic field. The control circuit 3 reads the ON/OFF pattern of the reed switch 2, and changes each set value based on this pattern.

In addition, in order to confirm the above change, control circuit 3
It is necessary to have a means to check whether the judgment is correct or not.
For this reason, in the embodiment, in order to confirm whether or not the signal received by the control circuit 3 is the one sent by the operating device, the cutoff/warning display LED 8 is blinked with the received unique putter. This flashing signal is received by the phototransistor 9, read into the control circuit 7 of the operating device 4, and checked to see if the settings are correct. If the verification result is correct, a signal indicating that it is correct is sent to the display means of the operating device 4 and the control circuit 3. The control circuit 3 receives this signal and confirms the change in the set value.

● Effects of the present invention As described above, the present invention includes a reed switch on the control circuit (microcomputer) side and an ON/OFF state of the reed switch.
We have installed a circuit that judges and changes the set value based on the OFF pattern, so you can turn the electromagnet on and off with the cover on.
By turning OFF, the abnormal flow rate judgment value and safe continuous use time setting values can be changed.

Therefore, it is convenient because it saves the trouble of removing the cover when changing the setting value, and since the setting value is not changed using physical contacts of switches or terminals, it is very reliable over time. It increases.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the changing device according to the present invention;
The figure is an explanatory diagram of the configuration and flow of operation on the operating device side.
The figure is an explanatory diagram of a conventional control circuit and an example of changing set values. 1... Gas accident prevention device, 2... Reed switch, 3... Control circuit, 4... Operating device (switching device), 5... Electromagnet, 6... Keyboard, 7...
...Control circuit, 8...LED, 9...Phototransistor, 10...Display.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A supply gas flow rate measuring device installed in the gas supply line, a supply gas emergency cutoff valve installed in the gas supply line, and a supply gas flow measuring device installed in the gas supply line, according to the amount of gas consumed. , the safe continuous use time of a single gas appliance can be memorized in advance, and the flow measuring device measures the overall gas flow rate at regular intervals, and if an increase is observed between the previous value and the current value. , let that increase be the consumption of one newly started gas appliance,
If a decrease is recognized, the use of the gas appliance whose consumption is closest to the decrease is assumed to have been stopped, and by this method, the gas consumption of each appliance currently in use can be determined, and the gas consumption of each appliance currently in use can be determined. From the time it is detected by the method described above that a gas appliance that consumes more gas than any of the appliances currently in use has been newly started, the continuous usage time will be measured, and the appliance will continue to be used as long as continued use of the appliance is permitted. Continuing to measure the usage time, when this measured time exceeds the safe continuous usage time of the gas appliance, it is determined that there is an abnormality and a close signal is issued to the emergency shutoff valve, or if the gas appliance is currently being used at the same time. The continuous use time of each gas appliance is continuously measured, and when the corresponding continuous use safe time is exceeded for the first time during this continuous use time, it is determined that there is an abnormality and the emergency shutoff valve is activated. Start measuring the continuous usage time from the time there is a change in the total flow rate of the supplied gas, or the maximum gas consumption appliance in use for the continuous use time of the same flow rate until the next change occurs. A gas accident prevention device comprising a control circuit configured to issue a closing signal to the emergency shutoff valve when a stored continuous use safe time is exceeded for the gas consumption amount,
The reed switch and the ON/OFF pattern of the reed switch are read into the control circuit, the ON/OFF pattern is judged, and the set value of the safe continuous use time in the control circuit is changed, and the metering of the flow rate measuring device is performed. A circuit is provided to select an appropriate constant among different constants for each unit, and a setting device with an electromagnet that continuously creates a magnetic field by turning a switch button ON and OFF is provided, and the magnetic field created by the electromagnet is transferred to the reed switch. A setting value changing device in a gas accident prevention device configured to be turned on and off when brought close to the device. 2 After the settings have been changed by the setting value changing device, turn on the reed switch on the control circuit side.
The OFF pattern is externally displayed by blinking an LED for emergency shutoff/warning display, and the blinking LED is read into a verification circuit through a phototransistor installed in the setting device to judge whether the setting is correct or not. A set value changing device in a gas accident prevention device according to claim 1, which is configured to display the determination result on a display means.