JP3885695B2 - Gas safety control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas safety control device that shuts off gas by an output from a gas leak alarm or the like, and more particularly to a gas leak safety circuit and a CO safety circuit.
[0002]
[Prior art]
Conventionally, this type of gas safety control device is generally as described in Patent Document 1, for example. As shown in FIG. 2, in this device, when the gas leaks, the photocoupler HC1 of the no-voltage alarm device 1 is electrically short-circuited (normally opened), and the gas safety control device 2 has the transistor Q1 turned on. For example, when the transistor Q2 is turned on, the valve 3 in the gas passage is closed to shut off the gas and prevent gas leakage. The connection of the no-voltage alarm device 1 is recognized by turning on the transistor Q3 of the gas safety control device 2, and when the no-voltage alarm device 1 is connected, Q4 is turned on by the current flowing through the photocoupler HC2. It is configured. Here, the transistors Q1 and Q3 are intermittently turned on to prevent interference between power saving and other functions (Q1 and Q3 are not simultaneously turned on).
[0003]
When this gas safety control device 2 is connected to a voltage alarm device (always outputs 6V and outputs 12V when gas leaks) instead of the no-voltage alarm device 1, the transistor Q4 is always connected from that point. Turn on. Then, the transistor Q4 is turned on while the transistors Q1 and Q3 are turned off, so that a voltage alarm is determined (if the voltageless alarm device 1 is connected, the transistor Q4 is turned on while the transistors Q1 and Q3 are turned off. Nothing), and the valve 3 in the gas passage was closed to shut off the gas.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-183207
[Problems to be solved by the invention]
However, in the above conventional gas safety control device, if the connection of the voltage alarm is detected, the gas is shut off, so various noises generated from radio equipment, radio towers, etc. are applied, and the transistors in the device malfunction. However, there is a problem that the gas may be shut off when the connection of the voltage alarm is erroneously detected.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a non-voltage alarm device that generates an electrical short signal when an abnormality such as a gas leak occurs, and a gas shut-off valve when an abnormality such as a gas leak occurs. A gas safety control device that is connected to a gas safety control circuit body that is operated to prevent the occurrence of gas leakage through a connection portion, the gas safety control circuit body repeatedly turning on and off at a predetermined cycle. A gas leak detector for confirming the output state of the voltage alarm device, an erroneous connection detector for repeatedly confirming the connection state of the no-voltage alarm device by turning on / off and reversing the gas leak detector, and the gas leak detector A microcomputer unit that confirms the presence or absence of gas leakage from the output state of the unit, and an erroneous connection safety unit that determines whether a voltage alarm is connected or noise is applied from the output state of the erroneous connection detection unit, Said error When the connection of the non-voltage alarm device is confirmed by the erroneous connection detection unit, the connection safety unit recognizes the alarm connection determination unit, and when both the gas leak detection unit and the erroneous connection detection unit are in the off state. When having a voltage alarm determination unit that recognizes that a voltage alarm is connected from the output state of the erroneous connection detection unit, when the voltage alarm determination unit detects the output of the error connection detection unit , It is determined whether a voltage alarm is connected or noise is applied based on the recognition data of the alarm connection determination unit, and if the alarm connection determination unit recognizes that there is a connection, a voltage alarm When the alarm connection determination unit recognizes that there is no connection, it is determined that noise or the like has been applied, and the gas cutoff valve is not operated. It is a thing.
[0007]
According to the above invention, the misconnection safety unit checks whether the alarm device is actually connected to the connection unit when it detects that the voltage alarm is connected, so that various noises are generated when the alarm device is not connected. Even when a transistor or the like in the device malfunctions due to being applied, it is possible to eliminate the possibility of erroneously determining as a voltage alarm and shutting off the gas.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a non-voltage alarm device that generates an electrical short signal when an abnormality such as a gas leak occurs, and a gas shut-off valve that operates when an abnormality such as a gas leak occurs. A gas safety control device in which a gas safety control circuit main body to be prevented is connected via a connecting portion, and the gas safety control circuit main body is repeatedly turned on / off at a predetermined cycle, and the output state of the no-voltage alarm device is changed. A gas leak detection unit to be confirmed, an erroneous connection detection unit to repeatedly check the connection state of the no-voltage alarm device by turning on / off and reversing the gas leak detection unit, and a gas leak from the output state of the gas leak detection unit A microcomputer unit for confirming the presence or absence of an error, and an erroneous connection safety unit for determining whether a voltage alarm is connected or noise is applied from the output state of the erroneous connection detection unit, the erroneous connection safety unit is The incorrect connection An alarm connection determination unit that recognizes when the connection of the non-voltage alarm device is confirmed by an output unit, and an output state of the erroneous connection detection unit when both the gas leak detection unit and the erroneous connection detection unit are in an off state. A voltage alarm determination unit that recognizes that a voltage alarm is connected, and when the voltage alarm determination unit detects the output of the erroneous connection detection unit, the alarm connection determination unit Based on the recognition data, it is determined whether a voltage alarm is connected or noise is applied. If the alarm connection determination unit recognizes that there is a connection, it is determined that a voltage alarm is connected. The shutoff valve is operated, and when the alarm connection determination unit recognizes that there is no connection, it is determined that noise or the like has been applied, and the gas shutoff valve is not operated .
[0009]
Then, if the when the organic voltage alarm determination unit misconnection safety unit has detected the output of the erroneous connection detection unit, to check alarm connection portion unit is connected, and determined to be connected Since the gas is shut off, various noises are applied when the alarm is not connected, the transistor in the device malfunctions, and the gas is shut off even when it is erroneously determined that the voltage alarm is connected. You can eliminate things.
[0010]
In addition, by connecting the LCD, when the voltage alarm detection unit detects that there is an output from the erroneous connection detection unit, if the alarm is not connected to the connection unit, the erroneous connection safety unit will send the information. It is also possible .
[0011]
And when the erroneous connection safety unit detects that there is an output from the erroneous connection detection unit when the voltage alarm determination unit detects that there is an output from the erroneous connection detection unit, it determines whether the alarm is connected to the connection unit and determines that it is not connected Since the information is output to the next stage, it is possible to notify a third party that the apparatus is in an environment affected by noise.
[0012]
In addition, when the alarm device connection determination unit detects that there is an output from the erroneous connection detection unit when the voltage alarm device determination unit detects that there is an output from the erroneous connection detection unit, if the alarm unit is not connected to the connection unit, an incorrect connection is stored. It can also be a safety part.
[0013]
And when the erroneous connection safety unit detects that there is an output from the erroneous connection detection unit when the voltage alarm determination unit detects that there is an output from the erroneous connection detection unit, it determines whether the alarm is connected to the connection unit and determines that it is not connected Therefore, it is possible to notify only a third party having means for reading the stored content that the apparatus is in an environment affected by noise.
[0014]
In addition, when the alarm device connection determination unit detects that there is an output from the erroneous connection detection unit when the voltage alarm device determination unit detects that there is an output from the erroneous connection detection unit, it stores that fact and the number of times It is also possible to provide an erroneous connection safety part that responds when the number of times exceeds a preset number.
[0015]
And when the erroneous connection safety unit detects that there is an output from the erroneous connection detection unit when the voltage alarm determination unit detects that there is an output from the erroneous connection detection unit, it determines whether the alarm is connected to the connection unit and determines that it is not connected The information is output to the next stage when the number of times exceeds the preset number, so that the device is more reliably detected in an environment affected by noise and notified to a third party. I can do it.
[0016]
In addition, when the alarm device connection determination unit detects that there is an output from the erroneous connection detection unit when the voltage alarm device determination unit detects that there is an output from the erroneous connection detection unit, it stores that fact, and then When the connection of the alarm device is recognized, the erroneous connection safety unit that responds to the alarm device with the information based on the above-mentioned memory can be used.
[0017]
And, when the erroneous connection safety unit detects that there is an output from the erroneous connection detection unit when the voltage alarm determination unit detects that there is an output from the erroneous connection detection unit, it is determined that the alarm is connected to the connection unit and it is determined that it is not connected When the alarm connection is recognized after that, the above memory is fed back to the alarm device, so that the device is in an environment affected by noise. You can be notified.
[0018]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
Example 1
1 is a functional block diagram and circuit diagram of a gas safety device according to a first embodiment of the present invention. In the figure, 4 is a non-voltage type first gas leak alarm, 5 is a gas safety control circuit body, 6 is a gas shut-off valve, 7 is a gas appliance, 8 is a gas sensor, 9 is an LCD, 10 is a connection device, Reference numeral 11 denotes a speaker. The first gas leak alarm 4 includes an HC 1 output after gas leak is detected, an HC 2 that receives a signal from the gas safety control circuit body 5, a speaker 11 that emits a warning sound, and a microcomputer section that controls them (hereinafter referred to as a microcomputer). ) Etc. The gas safety control circuit body 5 includes a gas leak detection unit a, b erroneous connection detection unit, alarm answering transistor Q5, d microcomputer unit, e gas cutoff valve drive unit (d microcomputer). Part). Further, the microcomputer section d includes 12 misconnection safety sections, and the misconnection safety section 12 includes a voltage alarm determination unit 12a and an alarm connection determination unit 12b. Although the second gas leak alarm device of the voltage type is not shown in the figure, the output is normally 6V, and 12V is output when there is an abnormality such as gas leak.
[0020]
Next, the operation and action will be described. When a gas leak occurs in the piping portion of the gas appliance 7, the gas sensor 8 detects it and the HC1 is turned on (short state). Then, the gas leak detection part a of the gas safety control circuit main body 5 is operated, and the gas cutoff drive valve e is operated from the microcomputer part d to prevent the occurrence of gas leak from the piping part of the gas appliance 7. Note that the transistor Q1 of the gas leak detection unit a is intermittently turned on (every second) so as to prevent interference between power saving and other functions (Q1 and Q3 are not simultaneously turned on). That is, when HC1 is turned on when the transistor Q1 is turned on, the transistor Q2 is turned on, the 3rd pin of the microcomputer d becomes low, the output to the 9th pin is performed, and the gas cutoff valve driving unit e is closed.
[0021]
Further, it outputs to the LCD 9 and displays gas leakage. Further, the gas safety control circuit body 5 responds to the gas leak alarm 4 with this gas leak information. This is done by turning on the alarm answering transistor Q5 and turning on the HC2 of the gas leak alarm 4 when the transistor Q3 is on.
[0022]
Moreover, the determination whether the gas leak alarm 4 is actually connected is performed as follows. When the gas leak alarm 4 is connected, the transistor Q4 is turned on by the current flowing through the photodiode of the HC2 when the transistor Q3 of the erroneous connection detector b is turned on, and the sixth pin of the microcomputer d becomes low. . When the alarm connection determination unit 12b in the erroneous connection safety unit 12 of the microcomputer d detects this, it recognizes that the gas leak alarm 4 is connected. This safety circuit corresponds to a non-voltage alarm device that recognizes an electrical short-circuit condition as a gas leak, but is configured to be safe even if a voltage alarm device is accidentally connected. The voltage alarm always outputs 6V, and outputs 12V when gas leaks. When this alarm device is connected, a voltage of 0.6 V or higher is applied to the base of the transistor Q4 of the erroneous connection detector b at the time of connection, the transistor Q4 is always on, and the 6th pin of the microcomputer d is always low. It becomes.
[0023]
The voltage alarm determination unit 12a detects this state when the 6th pin of the microcomputer d is a low signal when both the transistor Q1 of the gas leak detection unit a and the transistor Q3 of the misconnection detection unit b are turned off. It is determined that the voltage alarm is connected (if the voltageless gas leak alarm 4 is connected, the transistor Q4 is not turned on while the transistors Q1 and Q3 are turned off, and the microcomputer d No. 6 pin high signal).
[0024]
Then, the microcomputer d is instructed to determine the connection of the gas leak alarm device 4 described above. Further, after a certain time (required for connection determination), the voltage alarm determination unit 12a sends a signal to the alarm connection determination unit 12b to confirm the connection of the gas leak alarm 4. When the voltage alarm is connected, since the connection of the gas leak alarm 4 is confirmed, the gas cutoff drive valve e is operated and the gas cutoff valve 6 is closed. In this state, no gas is flowed, so the gas cannot be used, and the connected person is found to be erroneously connected, and a normal type alarm is connected. Next, a case where various kinds of noise generated from a radio device, a radio tower, etc. are applied to the gas safety control circuit body 5 when the gas leak alarm 4 is not connected will be described. The noise affects each part in the gas safety control circuit body 5, but it may also affect the transistor Q4. In normal times, it may be turned off due to malfunction. The 6th pin of the microcomputer d is set to a low signal. The voltage alarm connection determination unit 12a detects this state, and confirms the connection of the gas leak alarm 4 in the same manner as described above. In this case, the connection of the gas leak alarm 4 is not confirmed, and the gas shutoff drive is performed. The valve e is not operated to close the gas shut-off valve 6.
[0025]
【The invention's effect】
As described above, according to the present invention, even when an alarm is not connected, various noises are applied , the transistor in the gas safety control circuit malfunctions, and the abnormal voltage signal is applied to the microcomputer. It is possible to eliminate such a situation that the gas is cut off due to erroneous determination that the machine is connected. As a result, it is possible to supply a gas safety control device that does not malfunction even when an alarm is not connected even in an environment where noise may be generated.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram of a gas safety control device according to a first embodiment of the present invention. FIG. 2 is a block circuit diagram of a conventional gas safety control device.
4 First gas leak alarm 5 Gas safety control circuit body 6 Gas shut-off valve 10 Connection device 12 Incorrect connection safety section 12a Voltage alarm judgment section 12b Alarm connection judgment section a Gas leak detection section b Incorrect connection detection section

Claims (1)

Gas safety that prevents the occurrence of gas leakage by operating a non-voltage alarm that generates an electrical short signal when an abnormality such as a gas leak occurs and a gas shut-off valve that operates when there is an abnormality such as a gas leak A gas safety control device in which a control circuit main body is connected via a connecting portion ,
The gas safety control circuit main body is repeatedly turned on / off at a predetermined cycle to check the output state of the no-voltage alarm device, and repeatedly turns on / off and reverses the gas leak detection unit to An erroneous connection detector that confirms the connection state of the voltage alarm, a microcomputer that confirms the presence or absence of gas leakage from the output state of the gas leak detector, and a voltage alarm connected from the output state of the erroneous connection detector And an erroneous connection safety part that determines whether noise or the like has been applied ,
The erroneous connection safety unit is an alarm connection determination unit that recognizes when the connection of the no-voltage alarm is confirmed by the erroneous connection detection unit, and the gas leak detection unit and the erroneous connection detection unit are both in an off state. Sometimes it has a voltage alarm determination unit that recognizes that a voltage alarm is connected from the output state of the erroneous connection detection unit,
When the voltage alarm determining unit detects the output of the erroneous connection detection unit, it is determined whether a voltage alarm is connected or noise is applied based on the recognition data of the alarm connection determination unit. ,
When the alarm connection determination unit recognizes that there is a connection, it is determined that a voltage alarm is connected and the shut-off valve is operated,
A gas safety control device that determines that noise or the like has been applied when the alarm connection determination unit recognizes that there is no connection, and does not operate the gas shut-off valve .

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