JPH11328553A - Fire alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To grasp the approximate level of the generation of a fire by varying the sound volume of an alarm means according to variation in the density and temperature of smoke. SOLUTION: When smoke enters a fire alarm 1 and reaches density almost corresponding to a prediction level, a smoke density decision part 11 outputs a voltage corresponding to the density to an output control part 12. The output control part 12 outputs a voltage to a transistor Tr1 , which is turned on. Then the potential at a voltage division point drops and an IC 22 for alarming detects this voltage drop and outputs a voltage from a terminal 2 to a buzzer 21. The buzzer 21 makes a sound loud enough to be associated with the prediction level. When smoke of high density enters the fire alarm 1 as the fire expands, the smoke density decision part 11 outputs a voltage corresponding to the density to the output control part 12. The output control part 12 quits outputting the voltage to the TR Tr2 and outputs a voltage to a TR Tr2 . The potential at the voltage division part drops and the IC 22 for alarming detects that and outputs a voltage from the terminal 2 to the buzzer 21, which sounds loud.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fire alarm for a house.

[0002]

2. Description of the Related Art As shown in FIG. 5, when a certain smoke density is reached, a built-in buzzer 2 and the like emit a buzzer 2 and emit light when a fire alarm for households (domestic use) is widely used at present. The diode 3 is turned on. Reference numeral 4 denotes an alarm stop push button, which stops the alarm for several minutes when pressed during an alarm.

[0003]

However, the above-mentioned notification method has a problem that it is difficult to grasp a fire situation such as how much the fire is spreading. Another problem is that the buzzer alone cannot inform a person with hearing impairment of the occurrence of a fire.

[0004] The present invention has been made to solve the above problems, and an object of the present invention is to provide a fire alarm capable of grasping an outline of a fire occurrence level.

[0005]

According to the first aspect of the present invention, there is provided a fire alarm including a notifying means for notifying a fire occurrence in a fire alarm.
The sound volume of the notification means is changed in accordance with changes in the density and temperature of the smoke.

According to a second aspect of the present invention, there is provided a fire alarm having a notifying means for notifying the occurrence of a fire within the fire alarm, wherein the notifying cycle of the notifying means is changed in accordance with a change in smoke concentration or temperature. To change.

According to a third aspect of the present invention, there is provided a fire alarm having a light emitting means for displaying a fire occurrence in the fire alarm, wherein a light emission cycle of the light emitting means is changed in accordance with a change in smoke density or temperature. To change.

According to a fourth aspect of the present invention, there is provided a fire alarm having an external indicator light for indicating occurrence of a fire, wherein the indicator light is turned on or blinked when a set smoke density or temperature is reached.

According to a fifth aspect of the present invention, there is provided a fire alarm including an external flash for displaying a fire occurrence, wherein the flash is turned on when a set smoke density or temperature is reached.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an internal circuit diagram of a fire alarm, and FIG. 2 is an internal circuit diagram of a fire alarm of another embodiment.

(Embodiment 1) As a fire alarm, there are methods such as smoke detection and heat detection. In this embodiment, an example of a fire alarm based on smoke detection will be described. In FIG. 1, a fire alarm 1 includes a smoke detection IC circuit 10 and a notification unit 20 as its internal circuits.
And The smoke detection IC circuit 10 includes a smoke density determination unit 11
And an output control unit 12. The smoke concentration determination unit 11 detects smoke flowing into the fire alarm 1 and sends a voltage corresponding to the concentration to the output control unit 12. The output control unit 12 receives the voltage output from the smoke detection IC circuit 10 and outputs the voltage from the control lines L ₁ and L ₂ according to the smoke density level. In this example, the smoke density is output from the control lines L ₁ and L ₂ as two levels, but may be three levels, four levels,.

The notification unit 20 includes a transistor Tr ₁ and a transistor Tr ₂ as switching elements, and a buzzer 21
And a notification IC 22. The notification IC 22
The voltage is changed from the terminal 2 to the buzzer 21 according to the voltage applied to the terminal 1 and output. The terminal 1 of the notification IC 22 is connected to a voltage dividing point P of the resistors R ₁ and R ₂ , and the collector of the transistor Tr ₁ is connected to the voltage dividing point P via a resistor R _3. . More dividing point P, the collector of the transistor Tr ₂ is is connected via a resistor R _4. Transistor Tr ₁ , Transistor Tr ₂
Are connected to control lines L ₁ and L ₂ , respectively.
The resistance values of the resistors R ₂ , R _3, and R ₄ are equal to the resistance R
₂ > resistance R ₃ > resistance R ₄ .

Next, the operation will be described. When smoke due to a fire enters the fire alarm device 1 and reaches a density of about the forecast level, the smoke density determination unit 11 outputs a voltage corresponding to the concentration to the output control unit 12. The output control unit 11, the transistor Tr ₁ and the voltage output to the transistor Tr ₁ is turned on. Then, the potential at the voltage dividing point P decreases, and the notification IC 22 detects this voltage change and outputs a voltage from the terminal 2 to the buzzer 21. The buzzer 21 sounds with a sound having a size reminiscent of the forecast level.

When the fire progresses and smoke with a higher concentration enters the fire alarm 1, the smoke concentration determiner 11 outputs a voltage corresponding to the concentration to the output controller 12. The output control unit 11 to stop the voltage output to the transistor Tr _1, to the voltage output to the transistor Tr _2. Transistor Tr ₁
Is turned off, the transistor Tr ₂ is turned on. Then, the potential at the voltage dividing point P further decreases, and the notification IC 22 detects this voltage change and outputs a voltage from the terminal 2 to the buzzer 21. The buzzer 21 sounds with a loud sound reminiscent of the report level. By changing the volume as described above, the buzzer 2 is not suddenly sounded at a loud volume (sound pressure) as in the prior art, and the occupants are not surprised. Can be dealt with. For example, the buzzer 21 can be sounded with a small sound in response to low-concentration smoke generated during cooking or the like, and the operation of the fire alarm 1 can be detected without giving anxiety to a cook or a resident. There are benefits.

(Embodiment 2) FIG. 2 shows an example of a fire alarm based on smoke detection. The fire alarm 1 has a smoke detection IC circuit 10 and a notification unit 30 as its internal circuits. Smoke detection IC
The circuit 10 sequentially controls the control lines L ₄ , L ₅ ,
Continue to voltage output to L _6. Notification unit 30 includes a buzzer 31 and a transistor Tr _3, and Tr _4, Tr ₅ and resistor R _5, R _6. The connection relationship is as follows:
₃ collectors Yes connected to the emitter of the transistor Tr ₃ collector and the resistor R ₅ of the transistor Tr ₄ is connected, further resistor to the emitter of the transistor Tr ₄ R ₅
The connection point, the resistance and the collector of the transistor Tr ₅ R ₆
And are connected. The control lines L ₄ , L ₅ , L ₆ are respectively connected to the bases of the transistors Tr ₃ , Tr ₄ , Tr ₅ .

Next, the operation will be described. When smoke due to a fire enters the fire alarm 1 and the smoke density gradually increases, the transistors Tr ₃ , Tr ₄ , Tr ₅ are turned on one after another. After operation of the transistor Tr _3, it operated sequentially transistor Tr _4, Tr ₅ is, resistor R _5, the resistor R ₅
Are successively bypassed, and the volume of the buzzer 31 gradually increases. By changing the volume in this manner, the buzzer 2 is not suddenly sounded with a large sound pressure to surprise the occupants as in the conventional case, and the alarm sound is calmly dealt with. Becomes possible.
For example, for low-concentration smoke generated during cooking,
There is an advantage that the buzzer 31 can be sounded with a small sound, and the operation of the fire alarm 1 can be detected without giving anxiety to the cook or the resident.

Next, a second embodiment will be described with reference to FIG. FIG. 3 is an internal circuit diagram of the fire alarm. The fire alarm 1 has a smoke detection IC circuit 10 and a notification unit 40 as its internal circuit. Smoke detector IC circuit 10, the soft program, depending on the concentration of smoke, it is to output a different pulse signals pulse widths to the control line L _7. If the smoke density is relatively low, a pulse signal with a small pulse width is output. When the smoke density is medium, a pulse signal having a slightly larger pulse width is output. As the smoke density increases,
A pulse signal having a larger pulse width is output.

The notification unit 40 includes a constant voltage supply IC 41, a buzzer 42 or a light emitting diode 43, and a transistor Tr.
And a _6, base control line of the transistor Tr ₆ L ₇
Connected to

Next, the operation will be described. When smoke from the fire enters the fire alarm 1 and the smoke density gradually increases, the output pulse from the output control unit 12 gradually widens, and the tone of the buzzer 42 changes. By changing the timbre as described above, the buzzer 2 can be suddenly sounded at a large sound pressure as in the related art, so that the user is not surprised.

Next, a third embodiment will be described with reference to FIG. FIG. 4 is a connection diagram of a fire alarm and an indicator light or flash.

The fire alarm 1 via the signal line L _8, connects the indicator 5 or the flash 6 with an external condition. The fire alarm 1 is provided with a transfer terminal, and is configured to output a contactless output of no voltage to the indicator lamp 5 or the flash 6 from the transfer terminal. In this case, the indicator lamp 5 or the flash 6 is supplied with a commercial power supply separately or is of a storage battery type.

Incidentally, as a configuration for outputting a voltage from the fire alarm 1, a configuration may be adopted in which power is directly supplied to the indicator lamp 5 or the flash 6.

In the fire alarm 1, the smoke density at which the indicator lamp 5 or the flash 6 is turned on or blinks can be set. Accordingly, when the smoke density reaches the set value, the fire alarm 1 outputs a no-voltage or a voltage, and the display lamp and the flash can be turned on or off.

According to this embodiment, for example, at bedtime, not only the auditory stimulus by the buzzer 2 but also the visual stimulus by the flash can be given, and the fire detection rate can be improved.

[0025]

According to the first aspect of the present invention, there is provided a fire alarm having a notifying means for notifying the occurrence of a fire in the fire alarm, wherein the alarm is provided in accordance with a change in smoke concentration or temperature. Since the volume of the means is changed, it is possible to obtain the effect that the degree of fire progress can be grasped by hearing.

According to a second aspect of the present invention, there is provided a fire alarm having a notifying means for notifying the occurrence of a fire in the fire alarm, wherein the notifying means is provided in accordance with a change in smoke concentration or temperature. Since the notification cycle is changed, there is an effect that the degree of progress of the fire can be grasped by hearing.

According to the third aspect of the present invention, there is provided a fire alarm having a light emitting means for displaying a fire occurrence in a fire alarm, wherein the light emitting means is provided in accordance with a change in smoke density or temperature. Since the light emission cycle is changed, an effect is provided that even a person with hearing impairment can grasp the progress of the fire.

According to a fourth aspect of the present invention, there is provided a fire alarm including an external indicator light for indicating the occurrence of a fire, wherein the indicator light is turned on or flashed when a set smoke density or temperature is reached. Therefore, if the indicator light is installed outdoors, it is possible to provide an effect that a nearby person can take action such as a report and set a level of the transfer to the outside.

According to the fifth aspect of the present invention, there is provided a fire alarm including an external flash for displaying a fire occurrence, wherein the flash is turned on when a set smoke density or temperature is reached. By applying the visual stimulus, it is possible to promote early detection of a fire and to set a flashing level.

[Brief description of the drawings]

FIG. 1 is an internal circuit diagram of a fire alarm according to a first embodiment of the present invention.

FIG. 2 is an internal circuit diagram of a fire alarm according to another embodiment of the present invention.

FIG. 3 is an internal circuit diagram of a fire alarm according to a second embodiment of the present invention.

FIG. 4 is a connection diagram of a fire alarm and an indicator or a flash according to a third embodiment of the present invention.

FIG. 5 is a bottom view of a conventional fire alarm.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fire alarm 2 Buzzer 3 Light-emitting diode 5 Indicator (light-emitting means) 6 Flash (light-emitting means) 10 Smoke detection IC circuit 11 Smoke density determination section 12 Output control section 20 Notification section 21 Notification section (buzzer) 22 Notification IC 30 notifying section 31 notifying means (buzzer) 40 notification unit 41 a constant voltage supply IC Tr ₁ to Tr ₆ transistors L ₁ ~L ₇ control line L ₈ signal lines

Claims (5)

[Claims] 1. A fire alarm having a notifying means for notifying the occurrence of a fire in a fire alarm, wherein the volume of the notifying means is changed in accordance with a change in smoke concentration or temperature. Fire alarm. 2. A fire alarm, comprising: a notifying means for notifying the occurrence of a fire in the fire alarm, wherein the notifying cycle of the notifying means is changed in accordance with a change in smoke concentration or temperature. And fire alarm. 3. A fire alarm having a light emitting means for displaying a fire occurrence in a fire alarm, wherein a light emitting cycle of the light emitting means is changed in accordance with a change in smoke concentration or temperature. And fire alarm. 4. A fire alarm equipped with an external indicator light for indicating occurrence of a fire, wherein the indicator light is turned on or flashed when a set smoke concentration or temperature is reached. vessel. 5. A fire alarm having an external flash for displaying a fire occurrence, wherein the flash is turned on when a set smoke concentration or temperature is reached.