JPS58182799A - fire alarm control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire alarm control device that is capable of reducing non-fire alarms and controlling air conditioning using a smoke detector by combining a fire alarm device and an air conditioner.

Traditionally, smoke detectors used in fire alarm systems can detect low-concentration smoke such as cigarette smoke if they are made highly sensitive, but in order to prevent false alarms due to cigarette smoke, etc. It is sensitive enough to operate when the smoke concentration reaches 10%/m2, which is equivalent to 10%/m2, and therefore, it is used for air conditioning that detects that the indoor air is contaminated and turns on the smoke exhaust fan. They are not used as sensors, and control of the air conditioner relies on manual operation.

The present invention was made in view of this situation, and it provides a smoke detector of a fire alarm system with a threshold value that is more sensitive than a normal fire detector, and when a low concentration of smoke is detected, the smoke exhaust fan of the air conditioner is activated. Even if the smoke exhaust fan is operated for a predetermined period of time to ventilate the room and prevent non-fire alarms due to low concentration smoke detection, a fire will occur if low concentration smoke continues to be detected. The object of the present invention is to provide a fire alarm control device that can effectively perform air conditioning control and fire detection by issuing an alarm.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

First, to explain the configuration, ■ is a smoke detector installed in a restricted area, and smoke detector 1 is a smoke detection signal according to the smoke concentration in the atmosphere by an ionization smoke detector or a photoelectric smoke detector. The smoke detection circuit 2 has a smoke detection circuit 2 that outputs a smoke concentration that is lower than that of a normal fire detector, e.g.
A low concentration detection circuit 3 having a threshold value of 5%/m in terms of smoke attenuation rate and a high concentration, e.g.
Each of the high concentration detection circuits 4 has a normal threshold of 0 chi/m, and the low concentration detection circuit 3 detects a low concentration when the detected concentration by the smoke detection circuit 2 reaches a concentration that gives a light attenuation rate of 547 m. On the other hand, the high concentration detection circuit 4 outputs a high concentration detection signal e when the detected concentration of the smoke detection circuit 2 reaches a concentration corresponding to a light attenuation rate of 10%/m.

On the other hand, 5 is a receiver, which connects the smoke detector 1 with a signal line,
The low concentration receiving circuit includes a low concentration receiving circuit 6 that receives the low concentration detection signal e1 from the smoke detector 1, and a high concentration receiving circuit 7 that receives the high concentration detection signal e from the smoke detector 1. 6
The received output is given as a control signal to a smoke exhaust fan 9 of an air conditioner 8 installed in the warning area of the smoke detector 1. In addition, the output of the low concentration receiving circuit 6 is given to a confirmation circuit 10, and a confirmation signal indicating that the smoke exhaust fan 9 of the air conditioner 8 has been activated is manually input to the confirmation circuit 10. A confirmation output is generated when both outputs of the receiving circuit 6 are input.

The output of the confirmation circuit 10 is given to the storage circuit 11.
The accumulation circuit 11 is set to have an accumulation time of, for example, 1 minute, and produces an output when the output of the confirmation circuit 10 reaches the accumulation time. On the other hand, the received output of the high concentration receiving circuit 7 is input to one side of the AND gate 12, and the output of the low concentration receiving circuit 6 is input to the other side of the AND gate 12, and the low concentration receiving circuit 6 generates the received output. When the high-concentration receiving circuit 7 generates a received output in the state where The outputs of the AND gate 12 and the accumulation circuit 11 are input to the fire reception circuit 14 via the OR gate 13, and when the output of the high concentration reception circuit 7 is obtained via the accumulation circuit 11 or the AND gate 12, a fire occurs. The receiving circuit 14 operates an alarm section 15 and a fire display section 16 to issue a fire alarm.

Next, the action will be explained.

First, under normal monitoring conditions, the smoke detection circuit 2 of the smoke detector 1 detects smoke from a smoke screen, and the detected concentration reaches the threshold value of 5 chi/m set in the low concentration detection circuit 3. Then,
A low concentration detection signal e1 is output to the receiver 5. The low concentration receiving circuit 6 of the receiver 5 that has received the low concentration detection signal e, (5) outputs a control signal to the smoke exhaust fan 9 of the air conditioner 8 installed in the warning area of the smoke detector 1. Then, the smoke exhaust fan 9 is activated. At the same time, an output is also generated to the confirmation circuit 10, and the confirmation circuit 1
Since a confirmation signal due to the operation of the smoke exhaust fan 9 is inputted to 0, an output to the storage circuit 11 is generated. When the smoke exhaust fan 9 in the warning area where the smoke detector 1 is installed is activated based on the reception of the low concentration detection signal e, the smoke is exhausted by the indoor smoke exhaust fan 9. The smoke density detected by the smoke detection circuit 2 of the sensor 1 gradually decreases. Therefore,
Before the accumulation time set in the accumulation circuit 11, for example 1 minute, elapses, the detected concentration of the smoke detector 1 falls below the threshold value 5%/m set in the low concentration detection circuit 3, and the low concentration detection signal e is detected. , and the reception output of the low concentration receiving circuit 6 is also cut off, so that the smoke exhaust fan 9 is stopped after the smoke has been evacuated from the warning area, and the reception output of the low concentration receiving circuit 6 is also cut off.
6) When the force is cut off, the confirmation circuit 10 and the storage circuit 11 return to their initial states. In this way, in the steady monitoring state, the output of the low concentration detection circuit 3 of the smoke detector 1 controls the exhaust air of the air conditioner 8, and automatically controls the ventilation of the warning area where the smoke detector 1 is installed. is being carried out.

On the other hand, if a fire occurs in the warning area of the smoke detector 1, the detected concentration of the smoke detection circuit 2 will be lower than the threshold 5 of the low concentration detection circuit 3.
When the temperature reaches 1/m, the constant concentration detection signal e1 is output, and the low concentration receiving circuit 6 of the receiver 5 outputs the smoke exhaust fan 9 of the air conditioner 8 as in the normal state, and at the same time the confirmation circuit 10 produces an output for storage circuit 11. in this case,
Since smoke from the fire is detected, the smoke concentration in the warning area does not decrease even if the smoke exhaust fan 9 is activated, and the smoke detector 1
When the output of the low concentration detection signal e continues for the accumulation time of the accumulation circuit 11, the accumulation circuit 11 outputs an accumulation output to the fire reception (b) path 14 via the OR gate 13, and the alarm section 15 and the fire display section 16 are activated. A fire alarm is issued. Further, when the smoke concentration due to a fire rapidly increases, the high concentration detection circuit 4 outputs the high concentration detection signal e following the output of the low concentration detection circuit 3, and the high concentration detection signal e is output by the receiver 5. The receiving circuit 7 generates an output, and the low concentration receiving circuit 6 outputs an output through an AND gate 12 and an OR gate 13 which are in an allowable state.
The fire receiving circuit 14 is operated without waiting for the operation time of the smoke exhaust fan 9, that is, the accumulation time of the accumulation circuit 11, and the alarm section 15 and the fire display section 16 issue a fire alarm.

Similarly, even if the high concentration detection circuit 4 of the smoke detector 1 produces an erroneous output due to noise etc. in the steady monitoring state, the receiver 5
Since the output of the low-concentration receiving circuit 6 is not provided to the AND gate 12 in this case, the received output of the high-concentration receiving circuit 7 is not provided to the fire receiving circuit 14, and no false alarm is generated.

FIG. 2 is a block diagram showing another embodiment of the present invention, and this embodiment is a room occupancy detector 17 that detects the presence or absence of a person in the warning area of the smoke detector 1 using infrared rays, ultrasonic waves, etc. A receiving circuit 1 receives the detection signal of the room occupancy detector 17.
8 is provided in the receiver 5, and the receiving output of the receiving circuit [8] is provided to the confirmation circuit 10, and when the user is in the room, the air conditioner 8 It performs air conditioning control to operate the smoke exhaust fan 9, and when the absence is detected, prohibits the operation of the smoke exhaust fan 9, and also sends a signal to the confirmation circuit 10 to confirm the operation of the smoke exhaust fan 9. It is characterized in that the received output of the receiving circuit 6 is given to the storage circuit 11.

That is, if there is no person in the warning area where the smoke detector 1 is installed, there is no need to control the air conditioner 8, and the presence detection of the room occupancy detector 17 causes the low concentration received signal e1 to be detected.
The electric energy (9) of the air conditioner 8 is saved by prohibiting the operation of the smoke exhaust fan 9 based on the output of Therefore, upon reception of the low concentration detection signal e, the accumulation operation by the accumulation circuit 11 is immediately started, and a fire alarm is issued when the reception of the low concentration detection signal e1 reaches the accumulation time.

Of course, when the high concentration detection signal e is received from the smoke detector 1, the fire receiving circuit 14 is immediately activated without accumulating the signal.
to issue a fire alarm.

FIG. 3 is a block diagram showing another embodiment of the present invention. In this embodiment, the smoke exhaust fan 9 of the air conditioner 8 is a smoke exhaust fan 2o with a timer, and the smoke exhaust fan 9 is provided at the output of the check circuit 10. It is characterized by omitting the storage circuit.

That is, when the low concentration receiving circuit 6 receives the low concentration detection signal e1 from the smoke detector 1, the timer equipped smoke exhaust fan 20
is operated for a certain period of time, for example, one minute, based on the received output, and if the output of the low concentration detection signal from the smoke detector 1 is not cut off within the (10) operation time of this smoke exhaust fan 2o, the timer is activated. When the attached smoke exhaust fan 20 stops, an operation end signal is output to the confirmation circuit 10, the gate is opened by the operation end signal, and the output of the low concentration receiving circuit 6 is given to the fire receiving circuit 14, thereby causing the alarm section 15 and the fire display section. 16
A fire alarm is issued by the activation of the fire alarm.

Incidentally, the fire alarm upon reception of the high concentration detection signal e is the same as the embodiment shown in FIG.

Furthermore, in each of the above embodiments, the smoke detector 1 is provided with two levels of dark values, high and low, but the high concentration detection circuit that is a normal threshold value is omitted, and only the low concentration detection circuit is provided. A similar effect can be obtained by using a smoke detector.

As explained above, according to the present invention, a smoke detector installed in a restricted area has a threshold value that is more sensitive than a normal smoke detector, and when a low concentration of smoke is detected, the smoke exhaust fan of the air conditioner is activated. However, in order to issue a fire alarm when low-concentration smoke is detected after a predetermined time has elapsed after the smoke exhaust fan was activated, the low-concentration smoke detection output of the smoke detector installed in the restricted area is used. On the other hand, the problem of false alarms due to smoke detectors being set to high sensitivity to detect low-concentration smoke is due to the operation of the smoke exhaust fan and the low-concentration detection signal. This problem is solved by the accumulated output of the smoke detector, and reliability is improved by eliminating false alarms caused by smoke such as cigarettes by operating the smoke exhaust fan.In addition, by automatically controlling the air conditioner using a smoke detector, the air conditioner can be controlled appropriately. You can get the effect of being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a block diagram showing another embodiment of the invention using a room occupancy detector, and Fig. 3 is a block diagram showing a smoke exhaust fan with a timer. It is a block diagram showing another example of the present invention used. 1...Smoke detector 2...Smoke detection circuit 3...-
Low concentration detection circuit 4...High concentration detection circuit 5...Receiver 6...Low concentration reception circuit 7...High concentration reception circuit 8...Air conditioner 9...Smoke exhaust fan 1
0... Confirmation circuit 11... Accumulation circuit 12...
AND gate 13... OR gate 14... Fire receiving circuit 15... Alarm section 16... Fire display section 17... Room occupancy detector 18... Room occupancy receiving circuit 2
0-...Smoke exhaust fan with timer Patent applicant Susumu Takeuchi (13) Representative of Hochiki Co., Ltd. Patent attorney

Claims (1)

[Claims] A smoke detector installed in each warning area that has a highly sensitive threshold for smoke concentration in the atmosphere and outputs a low concentration detection signal when the smoke concentration reaches the highly sensitive threshold; When the signal line is connected and the low concentration detection signal is received, the smoke exhaust fan installed in the warning area of the smoke detector is activated, and even after a predetermined period of time has elapsed from the activation of the smoke detector, the low concentration detection signal is not emitted. and a receiver equipped with a storage type alarm output circuit that outputs a fire alarm when receiving a fire alarm.