JPS5840792B2 - Photoelectric smoke detector circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photoelectric smoke detector circuit, and an object thereof is to provide a photoelectric smoke detector circuit having a circuit configuration suitable for driving with battery power.

In conventional photoelectric smoke detector circuits, which use a battery as a power source to detect smoke, the operating status is determined by the appearance and reappearance of a display that responds to relay operation, but the battery quickly wears out and the smoke is detected over a long period of time. There is no detection capability with a battery, which makes replacing the battery a hassle, and it is unclear what operating state it is in unless you read the characters on the display, which is not suitable for this type of equipment that is mounted on the ceiling. This is a problem that requires improvement.

In view of the above problems, the present invention provides a photoelectric smoke detector circuit that reduces battery consumption as much as possible and has an easy-to-read display.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The photoelectric smoke detector of the present invention will be explained below with reference to the drawings shown as examples.

FIG. 1 shows an embodiment of the present invention, in which A is a light emitting circuit and B is a light emitting circuit.
is the detection circuit, C is the manual switch, D is the display switching circuit, E
is a battery.

The light emitting circuit A has an oscillation circuit 1 connected between two wires l□ and 12 from the batch IJ E, a switching element 2 that is turned on and off by the output of the oscillation circuit 1, and a connection between the collector of the switching element 2 and the line 11. A series circuit of the resistor 3, the light-emitting element 4, and one element 5a of the two-color light-emitting element 5 is connected to a series circuit of the switching element 6, which is turned on by the detection operation, and the other element 5b of the two-color light-emitting element 5. The emitter is connected to a line 12.

The detection circuit B includes a light receiving element 7 in order to drive the sound generating device 8 by the output of the light receiving element 7 which receives reflected light when the light beam of the light emitting element 4 collides with smoke particles when smoke F enters.
An amplifier 9 connected to the amplifier 9, a monostable multivibrator 10 that inverts using the amplified output as a trigger, and an integrating circuit 11 that integrates the output and outputs an output after a certain period of time, and the integrated output drives a switching element (not shown). This is to drive the sounding device 8 connected to the battery 1.

The manual switch C is driven by, for example, a pull string operation, and is suitable for operating a photoelectric smoke detector installed at a high place.The manual switch C is connected to a circuit that supplies power from a battery E to the sound generating device 8, and the circuit is connected to the circuit. The circuit is cut off and kept closed at all times.

The display switching circuit is constructed by connecting the output of the monostable multivibrator 10 of the detection circuit B to the switching element 6, and is designed to turn on the switching element 6 at the same time as the detection operation.

According to the present invention, when one of the two-color light-emitting elements 5a emits green light, when the switching element 2 is repeatedly turned on and off in response to the oscillation pulse of the oscillation circuit 1, the second Light emitting element 4 and element 5a for detection as shown in figure a.
An intermittent light appears.

When the element 5a shines green, the light notifies the outside that the device is in a state of alarm.

In this state, there is no input to the light receiving element 1, the amplifier 9 outputs a low level output as shown in FIG. 2, the monostable multivib break 10 is not inverted, and the sound generating device 8 is not driven.

Next, when smoke enters between the light emitting element 4 and the light receiving element 7, the light beam from the light emitting element 4 collides with the smoke particles, and the reflected light enters the light receiving element 7.

Therefore, the amplifier 9 outputs a high level output as shown in FIG. 2, and in order to stabilize the monostable multivibrator 10 by inverting as shown in FIG. The sound generating device 8 is driven as shown in g.

At the same time when the monostable multi-bi break 10 is reversed, the display switching circuit turns on the switching element 6, and as shown in FIG. Switching element 2
Drives intermittently by on/off operation.

Therefore, together with the light emitting element 4, the element 5 of the two-color light emitting element 5
When a and 5b are driven intermittently at the same time, and red and green are displayed, a yellowish light, which is the combined color of red and green, appears, indicating that the fire alarm operation has been switched to and giving a forecast.

In order to stop the drive of the sounding device 8 in this fire alarm operation, it is sufficient to turn off the manual switch C by external operation as shown in Fig. 2 f. When this happens, unnecessary sound is stopped without removing battery E, and unnecessary power consumption is cut off.

The element 5a, which displays the operating state in the above-mentioned alert state, is intermittently driven together with the light emitting element 4 by the switching element 2, and the element 5b, which displays the operating state in the fire alarm state, is also intermittently driven in the same way. In particular, since the two-color light emitting element 5 itself consumes less power, the consumption of the battery E can be reduced.

FIG. 3 shows another embodiment of the present invention, in which a light emitting circuit A, a detection circuit B, a manual switch C1 and a display switching circuit D are shown.
, a battery voltage monitoring circuit G is coupled to a photoelectric smoke detector circuit consisting of a batch IJE, and the battery voltage monitoring circuit G is configured with a level detection circuit 12 and an intermittent oscillation circuit 13 driven by the output thereof, The sound generating device is driven through a switching element not shown in the figure.
It can be connected to the sounding device 8 together with the detection circuit B.

According to this embodiment, in the alert state the batch IJ E
When the batch IJ is consumed and its voltage decreases, the level detection circuit 12 detects it as shown in the second figure, and during that period it can output an oscillation output with a larger period width than the intermittent oscillation circuit 13 as shown in the second figure i. Even if the battery E is used, the sound generating device 8 can generate an oscillating sound for a long time, and the battery E can be used effectively.

FIG. 4 shows another embodiment of the present invention, in which a switching element 14 is driven by the output of an integrating circuit 11 of a detection circuit B, and the switching element 14 drives a sounding device 8 and a relay 15. The contact 15a drives a display device or a sounding device at a remote location, and the relay 15 drives only the relay contact 15a, so the load force is small and the power consumption of the batch IJE is also low.

As described above, according to the photoelectric smoke detector of the present invention, the light emitting element 4 that emits light for detection and one element 5a of the two-color light emitting element 5 that displays the warning state are formed by the oscillation circuit 1 and the switching element 2. Intermittent drive and no intermittent drive In order to reduce the operating current in the alarm state, and to display the display during detection operation due to fire alarm, one element 5b of the two-color light emitting element 5 is used, and the display is performed by intermittent drive of the switching element 2. This is a photoelectric smoke detector circuit that reduces the display current, reduces consumption of batch IJE, allows the same batch IJE to be used for a long period of time, reduces battery replacement, and reduces maintenance and inspection work. be.

[Brief explanation of drawings]

The figures show an embodiment of the photoelectric smoke detector circuit of the present invention, FIG. 1 is a circuit diagram of one embodiment, FIG. 2 is a time chart showing the operation, and FIG. 3 is a circuit diagram showing another embodiment. FIG. 4 is a circuit diagram showing another embodiment. A... Light emitting circuit, B... Detection circuit, C... Manual switch, D... Display switching circuit, E... Battery, F
...Smoke, G...Battery voltage monitoring circuit, 1...Oscillation circuit, 2...Switching element, 3...Resistance, 4
... Light-emitting element, 5... Two-color light-emitting element, 5a, 5b.
... Element, 6... Switching element, 7... Light receiving element, 8... Sound generating device, 9... Amplifier, 10... Monostable multi-vibration break, 11... Integrating circuit, 12...
... Level detection circuit, 13... Intermittent oscillation circuit.

Claims (1)

[Scope of Claims] 1. Inserting one of the two-color light-emitting elements in series with the light-emitting element into a circuit that drives the light-emitting element with a switching element that is turned on and off by the output of an oscillation circuit connected to a battery power source, and a light emitting circuit in which the other element is driven by a switching element connected in series with a switching element that is turned on by a detection operation and turned on and off by the output of the oscillation circuit; and reflected light from the light emitting element colliding with smoke particles. A detection circuit that amplifies the output of a light-receiving element that receives light and photoelectrically converts it, detects it with a monostable multivibrator, integrates the output, drives a sounding device, and is equipped with a manual switch that turns off the circuit of the sounding device. and a display switching circuit formed by connecting a switching element turned on by the detection operation to the output of a monostable multivibrator. 2. Insert one of the two-color light emitting elements in series with the light emitting element into a circuit that drives the light emitting element with a switching element that is turned on and off by the output of an oscillation circuit connected to a battery power source, and performs a detection operation on the other element. a light-emitting circuit driven by a switching element connected in series with a switching element that is turned on by the output of the oscillation circuit and turned on and off by the output of the oscillation circuit; a detection circuit comprising a manual switch for amplifying the output of a light-receiving element, detecting it with a monostable multivibrator, integrating the output, driving a sounding device, and turning off the circuit of the sounding device; A display switching circuit consisting of a switching element that operates on is connected to the output of a monostable multi-bi break, and a display switching circuit that monitors the battery voltage, drives an intermittent oscillation circuit with its output, and connects it to a sounding device together with the output of a detection circuit. A photoelectric smoke detector comprising a battery voltage monitoring circuit.