JP2561320Y2 - Gas leak alarm system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leak alarm system.

[0002]

2. Description of the Related Art A conventional gas leak alarm system will be described with reference to FIG. The first power supply unit 100 is connected to a commercial power supply via a plug 102, rectifies AC 100 volts to DC, and reduces the voltage to a predetermined voltage. The first power supply unit 100 includes a detection unit 10 having a built-in gas leak sensor.
4. Power is supplied to the alarm unit 106 for notifying the gas leak and the first control unit 108. The transistor 110 is a first current regulating circuit that allows a current in the direction I3 when a base voltage is applied. On the other hand, the diode 112
This is a second current regulating circuit that is connected in parallel with the transistor 110 and allows a current in the reverse direction I4. The first control unit 108 controls the alarm 114 and detects
When a detection signal 116 indicating a gas leak is received from 04,
When the alarm unit 106 is activated, the transistor 110
To apply a base voltage. The second control unit 118 controls the first
Is supplied with power from a second power supply unit 120 that is separate from the power supply unit 100, and the transistor 110 and the diode 112
Then, currents in the I3 direction and the I4 direction are alternately flowed. The second control unit 118 controls an additional mechanism (for example, a gas circuit breaker), and activates the additional mechanism when the current I3 flows to the transistor 110. That is, when a gas leak is detected and the first control unit 108 applies a voltage to the base of the transistor 110, the second control unit 118 operates the additional mechanism. This is because the second control unit 118 constantly detects the disconnection and the short circuit between the first control unit 108 and the alarm 114 and the second control unit 118 by constantly flowing the current I4 to the diode 112.

[0003]

However, the above-mentioned conventional gas leak alarm system has the following problems. The second control unit 118 allows the currents I3 and I4 to flow alternately, but the diode 112 allows the current I4 regardless of the state of the first control unit 108. On the other hand, the current I3 is allowed only when the base voltage is applied to the transistor 110. Therefore, even when the user forgets to connect the plug 102 to the commercial power supply, the current I4 flows through the diode 112. On the other hand, even if the user forgets to connect the plug 102 to the commercial power supply and the transistor 110 is in an inoperative state, this state is the same as a state in which no gas leakage occurs. Therefore, the conventional gas leak alarm system cannot detect the plug 102 even if the user forgets to connect the plug 102 to the commercial power supply. For this reason, there is a problem in that if the user forgets to connect the plug 102 to a commercial power supply, a gas leak alarm cannot be issued and a circuit breaker cannot be operated even if a gas leak occurs. Therefore, in the present invention, the first power supply unit is O
An object of the present invention is to provide a gas leak alarm system that can notify a user of the FF state when the state is FF.

[0004]

To solve the above-mentioned problems, the present invention has the following arrangement. That is, a first power supply unit that is connected to a commercial power supply, rectifies an AC voltage supplied from the commercial power supply, and transforms the AC voltage to a predetermined voltage, receives power supplied from the first power supply unit, and detects gas leakage. Then, a detecting unit that outputs a detection signal, a first current regulating circuit that allows a current in a first direction when a voltage is applied, and a parallel connection with the first current regulating circuit, A second allowing current in a second direction opposite to the first direction when applied
A current regulating circuit, an alarm unit that operates upon receiving supply of electric power from the first power supply unit and notifies the occurrence of a gas leak, and receives a supply of electric power from the first power supply unit, Applying a voltage to the current regulating circuit of the, when receiving the detection signal from the detection unit, to activate the alarm unit,
A first control unit that applies a voltage to the first current regulating circuit, a second power supply unit that is separate from the first power supply unit, and operates by receiving power supply from the second power supply unit A notification unit for notifying that the first power supply unit is not operating; and a power supply unit for receiving power from the second power supply unit.
A current control circuit that alternately supplies the currents in the first direction and the second direction to the current control circuit, and a second control unit that activates the notification unit when no current flows to the second current control circuit. It is characterized by doing.

[0005]

[Operation] The operation will be described. A voltage is applied to the second current regulating circuit from the first power supply unit, and the second current regulating circuit does not flow a current unless a voltage is applied from the first power supply unit. The second control unit constantly supplies a current to the second current regulating circuit, and when the current does not flow to the second current regulating circuit, activates the notification unit to report the non-operation of the first power supply unit.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 10 denotes a first power supply unit, which is connected to a commercial power supply (AV 100 volt) via a plug 12, rectifies an AC voltage supplied from the commercial power supply to DC, and reduces the voltage to a predetermined voltage. . Reference numeral 14 denotes a detection unit, which incorporates a known gas leak detection sensor (for example, a semiconductor gas sensor). The detection unit 14 receives supply of power from the first power supply unit 10 and outputs a detection signal 16 when the sensor detects a gas leak. 18 is the first
Is a first transistor which is an example of a current regulating circuit of the first type, and when a base voltage is applied, a current flows in a first direction (I
Accept to 1). As the first transistor 18, an NPN transistor is used.

Reference numeral 20 denotes a second transistor which is an example of a second current regulating circuit, which is connected in parallel with the first transistor 18 and reverses the current when the base voltage is applied to the first direction. In the second direction (I2). Second
As the transistor 20, an NPN transistor is used. Reference numeral 22 denotes an alarm unit which operates upon receiving power supply from the first power supply unit 10 and notifies the occurrence of gas leakage.
The alarm unit 22 may employ, for example, a buzzer and a red LED. Reference numeral 24 denotes a first control unit 24, which controls the gas leak alarm 32. The first control unit 24 receives power supply from the first power supply unit 10 and constantly applies a voltage to the base of the second transistor 20 to turn on the second transistor 20. When the second transistor 20 is turned on, a current I2 flows. Also, the first control unit 24
When receiving the detection signal 16 from the detection unit 14, the alarm unit 2
2 and apply a voltage to the base of the first transistor 18 to turn on the first transistor 18. When the first transistor 18 is turned on, the current I1
Flows.

Reference numeral 26 denotes a second power supply unit, which uses, for example, a battery. The second power supply unit 26 includes the first power supply unit 1.
0 is a completely different power supply. Reference numeral 28 denotes a notification unit which operates upon receiving power supply from the second power supply unit 26. For example, when the plug 12 is not connected to the commercial power supply, the notification unit 28 notifies the user or the centralized monitoring center of the inactivity of the first power supply unit 10. Buzzer that operates directly or via a communication line as an example of the notification unit 28, red L
ED. A second control unit 30 controls the notification unit 28 and a gas circuit breaker which is an example of an additional mechanism. The second control unit 30 receives the supply of power from the second power supply unit 26, and constantly supplies currents I1 and I2 to the first transistor 18 and the second transistor 20 alternately.

The current I1 flowing to the first transistor 18
Is returned to the second control unit 30 when the detection unit 14 detects a gas leak and the first control unit 24 turns on the first transistor 18. Therefore, the current I1 is
Is returned to the control unit 30, the second control unit 30 activates the notification unit 28, activates the gas circuit breaker, and stops the gas supply. Further, the occurrence of gas leakage may be notified to the centralized monitoring center via the notification unit 28. On the other hand, the current I2 flowing to the second transistor 20
Is returned to the second control unit 30 because the alarm 32 and the second
This is a case where the circuit (including the communication line) with the control unit 30 is not disconnected. Therefore, the current I2 is controlled by the second control unit 3
When the flow returns to 0, the second control unit 30 can confirm that the electric wire is in a normal state. Note that by detecting the current I2, a short circuit between the alarm 32 and the second control unit 30 can also be detected. The occurrence of troubles such as disconnection and short circuit between the alarm 32 and the second control unit 30 is also notified by the notification unit 2.
8 can be notified.

Next, the operation of the gas leak alarm system configured as described above will be described. In a state where the first power supply unit 10 is operating normally, the first control unit 24
A voltage is applied to the base of the transistor 20 and the second transistor 20 is ON. The detector 14 constantly monitors for gas leaks. While the detection unit 14 does not detect a gas leak, the first control unit 24 controls the first transistor 18
Is turned off, and only the second transistor 20 is turned on. The second control unit 30 constantly switches the currents I1 and I2 alternately between the first transistor 18 and the second transistor 20.
Flow to In the monitoring state, the first transistor 18
Is OFF and the second transistor 20 is ON, so only the current I2 flows back to the second control unit 30.

If the detector 14 detects a gas leak, the first controller 24 turns on the first transistor 18 as well.
And the first transistor 18 and the second transistor 2
Both 0 are ON. As a result, the currents I1 and I2 flow back to the second control unit 30 alternately. In particular, the current I1
Is refluxed, the second control unit 30 determines that there is a gas leak,
The supply of gas is stopped by operating the gas circuit breaker, which is an additional mechanism. On the other hand, the first control unit 24 also activates the alarm unit 22 to issue a gas leak alarm. If the user forgets to connect the plug 12 to the commercial power supply, the base voltage is not applied from the first power supply unit 10 to the first transistor 18 and the second transistor 20. Therefore, the second
The current I2 does not flow back to the second control unit even if the control unit 30 of FIG. Therefore,
The second control unit 30 determines that the circuit between the alarm 32 and the second control unit 30 is disconnected. As a result, it can be determined that the first power supply unit 10 is not operating. This abnormality is reported via the reporting unit 28. As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and it is needless to say that many modifications can be made without departing from the spirit of the present invention. .

[0012]

When the gas leak alarm system according to the present invention is used, a voltage is applied to the second current regulating circuit from the first power supply unit, and the voltage is applied from the first power supply unit. Unless is applied, the second current regulating circuit does not flow current. The second control unit always supplies a current to the second current regulating circuit, and when no current flows to the second current regulating circuit, activates the notification unit and reports the non-operation of the first power supply unit. Since the user can recognize that the first power supply unit is in the OFF state, it is possible to prevent the user from forgetting to turn on the first power supply unit.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a gas leak alarm system according to the present invention.

FIG. 2 is a circuit diagram of a conventional gas leak alarm system.

[Explanation of symbols]

 Reference Signs List 10 first power supply 14 detection unit 16 detection signal 18 first transistor 20 second transistor 22 alarm unit 24 first control unit 26 second power supply unit 28 notification unit 30 second control unit I1 first direction Current I2 current in the second direction

Claims (1)

(57) [Scope of request for utility model registration] A first power supply unit connected to a commercial power supply for rectifying an AC voltage supplied from the commercial power supply and transforming the AC voltage to a predetermined voltage; receiving a power supply from the first power supply unit; A detection unit that outputs a detection signal when a leak is detected, and a first unit that allows a current in a first direction when a voltage is applied.
And a second current regulating circuit connected in parallel with the first current regulating circuit and allowing a current in a second direction opposite to the first direction when a voltage is applied. An alarm unit that operates upon receiving supply of electric power from the first power supply unit and notifies the occurrence of a gas leak; and receives an electric power supply from the first power supply unit and constantly operates the second power supply unit.
Applying a voltage to the current regulating circuit, and, upon receiving the detection signal from the detecting unit, activating the alarm unit and applying a voltage to the first current regulating circuit; A second power supply unit that is separate from the first power supply unit, a notification unit that operates upon receiving power supply from the second power supply unit, and that reports that the first power supply unit is not operating; Receiving a supply of power from the second power supply unit, alternately flowing currents in the first direction and the second direction to the first current regulating circuit and the second current regulating circuit; A second control unit that activates the notification unit when current does not flow to the gas leak alarm system.