JPS6316000Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a photoelectric smoke detector for home use in which a smoke detection part and an alarm part such as a buzzer are housed in the same case. , the operation of the entire circuit can be easily checked by operating the same changeover switch.

Conventionally, fire detectors for home use have had separate operations for a switch that stops the sound of a buzzer during operation and an operation check that checks the status of each function of the detector. This invention allows the alarm stop and operation check to be performed using the same switch. An embodiment of this invention will be described in detail below with reference to the drawings.

As shown in the drawing, the photoelectric smoke detector alarm stop and operation check device of this invention includes a photoelectric conversion element 1 that receives light scattered by smoke particles and converts it into an electrical signal, and a photoelectric conversion element 1 that amplifies the signal of the photoelectric conversion element 1. a switching circuit 3 that synchronizes with the light emitting section and emits an output signal when the output signal of the amplification circuit 2 exceeds a predetermined value; an oscillation circuit 4 that generates a pulse signal; and a pulse signal of the oscillation circuit 4. a light emitting element 5 that is driven by and emits pulsed light into the smoke monitoring space;
A check light source 6 for receiving light equivalent to light scattered by smoke particles directly or by reflecting it inside the case on the photoelectric conversion element 1, a capacitor 7 that constantly charges a power supply voltage, and a switching circuit. 3, an alarm device 9 such as a buzzer that is driven when the transistor 8 is on, a changeover switch 10 for stopping the alarm and checking its operation, and a power supply 11. It is composed of.

In the photoelectric smoke detector configured in this manner, the changeover switch 10 is normally connected to the contact A side. A voltage is applied from a power supply 11 to the amplifying circuit 2, switching circuit 3, oscillation circuit 4, and capacitor 7 to carry out a monitoring operation.

When smoke is generated due to a fire or the like and enters the smoke monitoring space of the sensor, the pulsed light from the light emitting element 5 is scattered by smoke particles, and this scattered light is received by the photoelectric conversion element 1. When the smoke detection signal of the amplifier circuit 2 exceeds a predetermined level, the switching circuit 3 operates and issues an output signal. The transistor 8 then becomes conductive and drives an alarm device 9 such as a buzzer. The sound of this buzzer notifies neighbors of the alarm condition.

In this sensor alarm state, when the changeover switch 10 is operated and turned to the contact B side, the power supply 11 supplied to each circuit is cut off, the transistor 8 changes from a conductive state to a cutoff state, and the alarm 9 operates. can be stopped.

In the normal monitoring state, when checking the operation of the sensor, the changeover switch 10 is switched from contact A to contact B in the same way as when stopping the alarm. Since the capacitor 7 is normally charged with an electric charge, even if the power supply 11 is turned off, each circuit continues to operate for a short time due to the energy stored in the capacitor 7. A pulse current flows through contact B, and light is emitted. The light from the check light source 6 directly
Or, the photoelectric conversion element 1 may be reflected inside the case.
It is configured to receive light. If each circuit operates normally, the switching circuit 3 operates at the same time as smoke is detected. The transistor 8 then becomes conductive and drives an alarm device 9 such as a buzzer. Since this operation time is performed by the discharge energy of the capacitor 7, it is short. That is, if the buzzer sounds momentarily immediately after switching, it indicates that the sensor is normal. Through this operation, it is possible to check whether the oscillation circuit 4 and most of the circuit functions of the sensor from the photoelectric conversion element 1 to the alarm 9 are normal.

As explained above, in this invention, the alarm can be stopped when the sensor is activated and the operation check can be performed using the same changeover switch 10, and also in the operation check, by providing the check light source 6. This is very useful in practice, since it is possible to check the functions of almost all the circuits of the sensor with simple operations.

[Brief explanation of the drawing]

The drawing is a wiring diagram showing one embodiment of the photoelectric smoke detector of this invention. 1...Photoelectric conversion element, 2...Amplification circuit, 3...
Switching circuit, 4...Oscillation circuit, 5...Light emitting element, 6...Light source for checking, 7...Capacitor, 8...Transistor, 9...Alarm device, 10...
...Selector switch, 11...Power supply.

Claims (1)

[Scope of utility model registration request] In a photoelectric smoke detector, which is composed of a light emitting element that irradiates a light beam into a smoke monitoring space, a light receiving element that detects light scattered by smoke particles, and an alarm that operates with an output signal of the light receiving element at a predetermined level or higher. , a check light source that emits light equivalent to light scattered by smoke particles, a capacitor that is connected between the power supply of the photoelectric smoke detector and that charges the power supply voltage, and a capacitor that charges the power supply voltage by separating the power supply from the photoelectric smoke detector. A device for stopping an alarm and checking the operation of a photoelectric smoke detector, characterized in that it is connected to the light source for checking and is equipped with a changeover switch which acts as an alarm stop during an alarm and as an operation check during monitoring.