JPH06274779A - Terminal equipment for fir alarm equipment - Google Patents

Abstract

PURPOSE:To inhibit return of the signals different from an actual state when the internal temperature of a terminal equipment becomes high by detecting this internal temperature of a terminal equipment and then stopping the operation of the terminal equipment when its internal temperature exceeds a prescribed level. CONSTITUTION:An internal temperature detecting part 70 consists of the diodes D1 and D2 and a resistance R1 provided on an internal printed board of a smoke/flame sensor 1 similarly to other circuit elements. A microcomputer 10 outputs a power cut-off signal through an output port P when it is decided that the voltage corresponding to the internal temperature detected by the part 70 is higher than the voltage corresponding to the maximum allowable temperature. Therefore the microcomputer 10 decides whether the internal temperature of the sensor 1 is higher than a prescribed temparature or not after the internal temperature of the sensor 1 is detected by the part 70. When the internal temperature of the sensor 1 is higher than the prescribed level, the operation of the sensor 1 is stopped. Thus the malfunctions of the sensor 1 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature guarantee device for terminal devices such as fire detectors and repeaters.

[0002]

2. Description of the Related Art In a fire detector in a fire alarm system, each sensor periodically detects the ambient temperature, the amount of smoke, etc.
When a built-in microcomputer (microcomputer) or the like determines that the detection amount exceeds a preset reference level, a fire alarm is issued to the receiver via a signal line.

[0003]

By the way, the fire detector is installed in an environment where the temperature becomes extremely high during a fire.
Once a fire occurs, not only the temperature around the fire detector but also the temperature inside the fire detector becomes very high. The microcomputer has a standard for temperature, and the operation of the microcomputer is not guaranteed at a temperature above this standard (a temperature above the nominal temperature). Therefore, when the ambient temperature of the microcomputer becomes abnormally high, the microcomputer may run into heat and run unexpectedly. For example, if a fire detector is installed in a certain warning area, a microcomputer is built in the fire detector, a fire occurs only in that warning area, and a fire does not occur in another warning area. Nevertheless, it may send a false alarm to the receiver that a fire has occurred in another warning zone, and even if there is a subsequent fire in one warning zone, There is a problem that a signal indicating that the temperature has returned to the normal temperature may be sent to the receiver, and a signal whose meaning is unknown may be sent back to the receiver. That is, when the ambient temperature of the microcomputer becomes abnormally high, a signal different from the actual one may be returned to the receiver.

In this case, in the receiver, the receiver may give a false alarm based on an erroneous signal from the fire detector, and since the signal returned from the fire detector has no meaning, it is interpreted. Can slow down processing at the receiver.

The cause of the fire detector returning a signal different from the actual one to the receiver as described above is that the built-in parts of the fire detector are other than when the ambient temperature of the fire detector becomes high. It is possible that abnormal heat is generated and a signal different from the actual one is returned to the receiver due to this heat.

Further, the above problem occurs not only in the fire detector but also in a terminal device such as a repeater, a transmitter, or a controlled device controlled by the fire receiver such as a smoke proof device.

The present invention relates to a fire alarm system capable of preventing the terminal device from returning an unrealistic signal to the receiver when the internal temperature of the terminal device in the fire alarm system becomes abnormally high. It is intended to provide a terminal device.

[0008]

DISCLOSURE OF THE INVENTION The present invention is to detect the temperature inside a terminal device in a fire alarm facility and stop the operation of the terminal device when the internal temperature is equal to or higher than a predetermined temperature. .

[0009]

The present invention detects the internal temperature of the terminal equipment in the fire alarm equipment and stops the operation of the terminal equipment when the internal temperature is equal to or higher than the predetermined temperature. It is possible to prevent the terminal device from returning an unrealistic signal to the receiver when it becomes abnormally high.

[0010]

1 is a block diagram showing a smoke-type fire detector 1 according to an embodiment of the present invention.

In this embodiment, a microcomputer (microcomputer) 10 controls the smoke-type fire detector 1 as a whole, and a ROM 20 stores the program of the flow chart shown in FIG. RAM
Reference numeral 21 denotes a work area, which stores the output voltage SLT of the internal temperature detection unit 70, the output voltage SLV of the sample hold circuit 42 that holds the peak value of the amplifier circuit 40, and the calculated smoke concentration value. is there.

The ROM 20 also stores the address of the smoke type fire sensor 1 and the voltage SLTm corresponding to the maximum allowable temperature in the smoke type fire sensor 1. The voltage SLTm corresponding to the maximum allowable temperature is the smoke type fire detector 1
It is determined with reference to the nominal temperature of the active elements and the like provided therein. In the above embodiment, the voltage SLTm corresponding to the maximum allowable temperature is determined with reference to the nominal temperature of the microcomputer 10.

The light emitting circuit 30 supplies a current pulse for light emission to the light emitting element 31 when receiving a light emission control pulse from the microcomputer 10, and the amplifier circuit 40 sets the output level of the light receiving element 41 to a predetermined gain. It is to be amplified by. The transmission / reception circuit 50 has a transmission circuit for transmitting a signal from the microcomputer 10 to a receiver (not shown) and a reception circuit for receiving a signal from the receiver and transmitting it to the microcomputer 10.
The confirmation light 51 is turned on when the smoke-type fire detector 1 shown in FIG. 1 detects a fire.

The constant voltage circuit 60 is a circuit that supplies a constant voltage to the microcomputer 10, and the switching circuit 61 is turned off by a power-off command signal output from the output port P of the microcomputer 10, and is normally It is turned on.

The internal temperature detector 70 is a smoke type fire detector 1
For detecting the temperature inside the casing (not shown), diodes D1 and D2 provided inside the smoke-type fire detector 1 in the same manner as other circuit elements, for example, on a printed circuit board,
A resistor R connected in series with these diodes D1 and D2
It is composed of 1 and 1. That is, one end of the resistor R1 is connected to the power source _Vcc , the other end of the resistor R1 is connected to the anode terminal of the diode D1, the cathode terminal of the diode D1 is connected to the anode terminal of the diode D2, and the cathode terminal of the diode D2 is connected to The connection point between the other end of the resistor R1 and the anode terminal of the diode D1 is grounded and serves as the output terminal of the internal temperature detection unit 70. The internal temperature detector 70
Is to detect the internal temperature of the smoke-type fire detector 1 by utilizing the temperature characteristic of the voltage across the diodes D1 and D2. The diodes D1 and D2 are preferably provided near the microcomputer 10.

Further, in the microcomputer 10, the voltage corresponding to the internal temperature detected by the internal temperature detecting section 70 via the built-in analog / digital converter A / D is higher than the voltage SLTm corresponding to the maximum allowable temperature or higher. When it is determined that the power-off command signal is output from the output port P.

The internal temperature detecting section 70 is an example of temperature detecting means for detecting the internal temperature of the fire detector 1. The microcomputer 10 is an example of temperature comparison means for detecting that the internal temperature of the fire detector 1 is higher than a predetermined temperature, and the temperature comparison means detects that the internal temperature of the fire detector is higher than the predetermined temperature. It is also an example of the operation stopping means for stopping the operation of the fire detector when the operation is performed.

Next, the operation of the above embodiment will be described.

FIG. 2 shows the microcomputer 1 in the above embodiment.
7 is a flowchart showing an operation performed by 0.

First, initial values are set (S1), and the ROM
The voltage SVTm corresponding to the maximum allowable temperature is read from 20 and stored in the RAM 21 (S2), and the internal temperature detecting unit 70 is read.
Of the output voltage SLT is stored in the RAM 21 (S3).

Then, the microcomputer 10 compares the voltage SVTm corresponding to the maximum allowable temperature stored in the RAM 21 with the output voltage SLT of the internal temperature detector 70 (S
4) If the output voltage SLT of the internal temperature detection unit 70 is equal to or lower than the voltage SVTm corresponding to the maximum allowable temperature, the ambient temperature of the microcomputer 10 in the fire detector 1 is not so high as to cause thermal runaway of the microcomputer 10. The fire detection operation is performed as usual (S5).

On the other hand, in step S4, if the output voltage SLT of the internal temperature detecting section 70 is higher than the voltage SVTm corresponding to the maximum allowable temperature, the microcomputer 10 may be out of control, and the power is cut off from the output port P. A command signal is output, the switching circuit 61 is turned off, and the power supply from the constant voltage circuit 60 to the microcomputer 10 is stopped (S1).
2). Before stopping the power supply, the receiver is informed that the fire detector 1 will stop operating (S11).
The step of notifying the receiver of the operation stop before the power supply is stopped may be omitted.

According to the above embodiment, when the internal temperature of the fire detector 1 becomes abnormally high, the fire detector 1 can be prevented from returning a signal different from the actual signal to the receiver. In addition, although the smoke type fire detector 1 has been described as an example in the above-described embodiment, when the other type of fire detector such as a thermal type fire detector is used instead of the smoke type fire detector 1, Similar to the fire detector, but instead of a repeater,
The same applies to the case of using a controlled device (smoke-proof device, etc.) controlled by the fire receiver.

Instead of the internal temperature detecting section 70, an internal temperature detecting section utilizing the temperature characteristic of the voltage between the base and emitter of the transistor may be used, and an internal temperature detecting section utilizing a thermistor or the like. May be used.

FIG. 3 is a block diagram showing a smoke type fire detector 2 which is another embodiment of the present invention.

The smoke-type fire detector 2 shown in FIG. 3 is basically the same as the smoke-type fire detector 1 shown in FIG. 1, and the internal temperature detecting section 70 in FIG. Instead of outputting the power cutoff command signal, a power cutoff control circuit 80 is provided, and the power cutoff control circuit 80 outputs the power cutoff command signal.

The power cutoff control circuit 80 is composed of an internal temperature detection circuit 81, a reference voltage generation circuit 82 and a comparator C1 and is provided in the housing of a sensor (not shown). The internal temperature detection circuit 81 includes a thermistor TH and a resistor R.
1 is a circuit that is connected in series and generates an internal temperature corresponding voltage corresponding to the internal temperature. The reference voltage generating circuit 82 is
The resistors R1 and R2 are connected in series to generate a reference voltage, and the comparator C1 outputs a power cutoff command signal when the internal temperature corresponding voltage becomes higher than the reference voltage.

The comparator C1 is an example of temperature comparing means for detecting that the internal temperature of the terminal equipment is higher than a predetermined temperature, and the power shutoff control circuit 80 indicates that the internal temperature of the terminal equipment is higher than the predetermined temperature. It is an example of operation stopping means for stopping the operation of the terminal device when the temperature comparing means detects.

FIG. 4 is a block diagram showing a smoke-type fire detector 3 according to another embodiment of the present invention.

The smoke-type fire detector 3 shown in FIG. 4 is basically the same as the smoke-type fire detector 2 shown in FIG. 3 except that the power-off control circuit 80 outputs a power-off command signal to the microcomputer. Instead of stopping the power supply to 10, the transmission stop control circuit 90 is provided and the transmission stop control circuit 90 stops the signal transmission to the receiver.

The sending stop control circuit 90 is composed of an internal temperature detecting circuit 91, a reference voltage generating circuit 92 and a comparator C2, and is provided in the housing of a sensor (not shown). The internal temperature detection circuit 91 includes a thermistor TH and a resistor R.
1 is a circuit that is connected in series and generates an internal temperature corresponding voltage corresponding to the internal temperature. The reference voltage generating circuit 92 is
The resistors R2 and R3 are connected in series to generate a reference voltage. The comparator C2 outputs a transmission stop command signal when the internal temperature corresponding voltage becomes higher than the reference voltage.

The switching circuit 50s is a transmission / reception circuit 5
0 is a switch provided between the receiver and the receiver, which is normally turned on and turned off when a transmission stop command signal is received.

The comparator C2 is an example of temperature comparing means for detecting that the internal temperature of the terminal equipment is higher than the predetermined temperature, and the sending stop control circuit 90 indicates that the internal temperature of the terminal equipment is higher than the predetermined temperature. It is an example of the signal transmission stopping means for stopping the transmission of the signal from the terminal device when the temperature comparison means detects.

In each of the above embodiments, the operation of the microcomputers 10 and 11 provided in the smoke type fire detector and the sending operation of the transmission / reception circuit 50 are stopped. The operation of internal circuit components other than the circuit 50 may be stopped.

In the fire detector of each of the above embodiments, the one whose operation is stopped should be replaced.
Although detailed description is omitted, it is preferable that the receiver to which these terminal devices are connected or connected thereto record the terminal device whose operation is stopped.

[0036]

According to the present invention, when the internal temperature of the terminal equipment in the fire alarm facility becomes abnormally high, the terminal equipment can be prevented from returning a signal different from the actual signal to the receiver. Has the effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a smoke-type fire detector 1 according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation executed by a microcomputer 10 in the above embodiment.

FIG. 3 is a block diagram showing a smoke-type fire detector 2 according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a smoke-type fire detector 3 according to another embodiment of the present invention.

[Explanation of symbols]

 1, 2, 3 ... Smoke type fire detector, 10, 11 ... Microcomputer, 20 ... ROM, 21 ... RAM, 30 ... Light emitting circuit, 31 ... Light emitting element, 40 ... Amplifying circuit, 41 ... Light receiving element, 50 ... Transceiver circuit , 50s, 61 ... Switching circuit, 70, 81, 91 ... Internal temperature detecting section, 60 ... Constant voltage circuit, 82, 92 ... Reference voltage generating circuit, 80 ... Power supply cutoff control circuit, 90 ... Delivery stop control circuit.

Claims (5)

[Claims] 1. A temperature detecting means for detecting an internal temperature of a terminal device in a fire alarm facility; a temperature comparing means for detecting that the internal temperature of the terminal device is higher than a predetermined temperature; an internal temperature of the terminal device. Is higher than a predetermined temperature when the temperature comparing means detects an operation stopping means for stopping the operation of the terminal equipment. 2. The terminal in a fire alarm facility according to claim 1, wherein the terminal device is at least one of a fire detector, a relay device, and a controlled device controlled by a fire receiver. machine. 3. The terminal device in a fire alarm facility according to claim 1, wherein the operation stopping means stops the operation of a microcomputer or an internal circuit component built in the terminal device. 4. The fire receiver according to claim 1, immediately before the operation stopping means stops the operation of the terminal device, notifying the fire receiver that the terminal device stops the operation, and stopping the operation after the notification. A terminal device in a fire alarm facility characterized by: 5. A temperature detecting means for detecting the internal temperature of the terminal equipment in the fire alarm facility; a temperature comparing means for detecting that the internal temperature of the terminal equipment is higher than a predetermined temperature; an internal temperature of the terminal equipment. Is higher than a predetermined temperature when the temperature comparison means detects that the signal transmission stop means for stopping the signal transmission from the terminal equipment; terminal equipment in the fire alarm equipment.