KR20230039040A - Fire Sensor Detector of Differential Motion - Google Patents

Abstract

According to the present invention, if it is not an actual fire, but a sudden rise in temperature such as a lighter, grilling meat, electromagnetic waves, or lightning in a localized area, a differential fire detection device measures ambient temperature again using an accumulation function of a receiver and prevents malfunction of a fire detector through temperature comparison, thereby preventing unnecessary sprinkler operation and contact with a fire station.

Description

Differential fire detection device {Fire Sensor Detector of Differential Motion}

The present invention relates to a differential fire detection device, and more particularly, when a rapid increase in temperature such as a lighter, grilling meat, electromagnetic waves, lightning, etc. in a local area is not an actual fire, the ambient temperature is reset using a receiver accumulation function. It relates to a differential fire detection device capable of preventing malfunction of a fire detector through temperature comparison by measuring.

In general, fire detectors include differential fire detectors or constant temperature detectors that detect changes in heat.

A constant temperature type fire detector generates a fire detection signal that detects a fire and transmits it to a receiver when the temperature around the detector is higher than a certain temperature.

The differential type fire detector generates a fire detection signal that detects a fire and transmits it to a receiver when the temperature around the detector rises above a certain temperature increase rate.

For example, when the temperature around the sensor is 20 ° C., when the room temperature is 20 ° C., when the temperature rise rate (eg, 30 ° C.) or higher, that is, when 20 ° C. (room temperature) => 50 ° C. (measured value), a fire detection signal is generated. .

Conventional differential type fire detector senses a fire detection signal and transmits it to a receiver when the ambient temperature of the detector rises by more than 30° C. from room temperature (20° C.).

When the receiver receives a fire detection signal from the differential fire detector, an alarm is generated and a sprinkler operation and dispatch signal are transmitted to the fire department to request the fire department to be dispatched.

However, conventional differential type fire detectors detect fire immediately if it is higher than a certain temperature (e.g. 50℃) when the cause is not an actual fire, but a rapid rise in temperature such as lighter, meat grilling, electromagnetic waves, lightning, etc. in a local area. Operation and fire brigade contact functions are performed.

In the conventional differential fire detector, when the measured temperature is recognized as room temperature + 30 ° C, regardless of whether or not there is a malfunction, the detector is operated and turned on / off within the accumulation time of the receiver. The problem of recognizing as occurs.

Subsequently, when the conventional differential fire detector is re-operated, it must be room temperature (50 ° C) + 30 ° C = 80 ° C to detect and operate a fire signal. Therefore, since the differential fire detector operates at an operating temperature of 80° C., it is difficult to recognize the fire signal.

Korea Patent Registration No. 10-0892662

In order to solve this problem, the present invention compares the temperature by measuring the ambient temperature again using the receiver accumulation function when the cause is not an actual fire but a rapid increase in temperature such as a lighter, grilling meat, electromagnetic waves, lightning, etc. in a local area. An object of the present invention is to provide a differential fire detection device capable of preventing malfunction of a fire detector through

Differential fire detection device according to the features of the present invention for achieving the above object,

A temperature detection unit for detecting an ambient temperature, and a microcomputer for periodically sensing a first temperature detected by the temperature detection unit and for flowing an operating current when the detected first temperature exceeds room temperature + a preset temperature increase rate. one fire detector; and

It is electrically connected to the fire detector, and when the operating current of the fire detector flows and operates, the power supplied to the fire detector is cut off one or more times within a preset accumulation time and then re-applied power after a few seconds. Including a receiver that performs the function,

The microcomputer detects a second temperature from the temperature detector when power is applied after a few seconds after power is cut off within the accumulation time according to the accumulation function of the receiver, and the detected second temperature is room temperature + a preset temperature. If the temperature rise rate is less than or equal to the temperature increase rate, it is recognized as a malfunction of the fire detector and reset to an initial value.

When the microcomputer is turned on and off within the accumulation time of the receiver, the room temperature + the preset temperature increase rate is stored and maintained as it is without being reset.

The receiver can control to change the accumulation time, the number of times power is turned on and off, and the power re-apply time.

The fire detector includes a rectification processing unit for rectifying power supplied from the receiver;

a constant voltage conversion unit that converts the power rectified through the rectification processing unit into a constant voltage;

The temperature detection unit detects and detects a temperature change;

a micom that detects a temperature change in the temperature detector and determines whether or not there is a fire; and

When the temperature detected by the temperature detection unit reaches the operating temperature, an operating current unit generating an operating current under the control of a microcomputer is included.

According to the configuration described above, the present invention measures the ambient temperature again using the receiver accumulation function when the differential fire detector is not an actual fire but a sudden increase in temperature such as a lighter, grilling meat, electromagnetic waves, or lightning in a local area. It is possible to prevent malfunction of the fire detector through temperature comparison, which has the effect of preventing unnecessary sprinkler operation and contact with the fire department.

1 is a block diagram conceptually showing the configuration of a differential fire detection device according to an embodiment of the present invention.
2 is an exploded perspective view showing the appearance of a fire detector according to an embodiment of the present invention.
3 is a block diagram showing a circuit of a fire detector according to an embodiment of the present invention.
4 is a circuit diagram of a fire detector according to an embodiment of the present invention.

Throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

1 is a block diagram conceptually showing the configuration of a differential fire detection device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the appearance of a fire detector according to an embodiment of the present invention, and FIG. It is a block configuration diagram showing a circuit of a fire detector according to an embodiment, and FIG. 4 is a diagram showing a circuit diagram of a fire detector according to an embodiment of the present invention.

Differential fire detection device 100 according to an embodiment of the present invention includes a fire detector 110 and a receiver 170.

The fire detector 110 is formed by combining an upper case 110a, a middle case 110b, and a lower case 110c, and a PCB board having an IC chip is mounted on the middle case 110b.

The fire detector 110 includes a rectification processing unit 120 that rectifies power supplied from the receiver 170, a constant voltage converter 130 that converts the power rectified through the rectification processing unit 120 into a constant voltage, and a temperature change. When the temperature detection unit 140 detects and detects, the temperature change in the temperature detection unit 140 is detected and the micom 150 determines whether a fire has occurred, and the temperature detected by the temperature detection unit 140 reaches the operating temperature, the micom ( An operating current unit 160 generating an operating current under the control of 150 is configured in the form of a PCB board.

The rectification processing unit 120 includes bridge diodes D1 and D2 121 and a capacitor C7 122. The bridge diode 121 and the capacitor C7 122 rectify incoming power and , it plays a smoothing role.

The rectification processing unit 120 supplies power through the bridge diodes D1 and D2 121 through the capacitor C7 122, which is a constant voltage anti-noise filter of 24V through the receiver 170.

The constant voltage conversion unit 130 includes a transistor (Q3) 131, a zener diode (ZD1) 132, and a resistor (R1) 133, and converts the current introduced through the rectification processing unit 120 to a constant voltage. play a role in maintaining

In the constant voltage conversion unit 130, the voltage input through the rectification processing unit 120 is made 4V by the Zener diode (ZD1) 132 through the transistor Q3 131, and the 4V micom 150 operates. It is used as a power source for

In the temperature detector 140, one end of an NTC thermistor 141, which is a temperature sensor, is connected in series to the resistor R5 142, and the other end of the NTC thermistor 141 is connected to port 5 of the microcomputer 150. Connect the wires in parallel.

The other end of the NTC thermistor 141 connects a resistor (R3) 143 and a capacitor (C8) 144 in parallel, respectively, and the capacitor (C8) 144 is grounded.

The other end of the NTC thermistor 141 is connected to port 6 of the microcomputer 150 through a resistor R3 (143).

The temperature detector 140 detects temperature information by reading the voltage at intervals of about 2 seconds and replacing it with a temperature value.

The operating current unit 160 includes a PNP transistor (Q1) (161), an NPN transistor (Q2) (162), a capacitor (C3) (163), a resistor (R6) (164), a resistor (R7) (165), light emitting diode 166.

Port 3 of the microcomputer 150 is connected to the base terminal of the NPN transistor Q2 162 by a resistor R4 151.

The NPN transistor (Q2) (162) is connected to the collector terminal and the base terminal of the PNP transistor (Q1) (161).

The PNP transistor (Q1) (161) connects a capacitor (C3) (163) and a resistor (R6) (164) in parallel between the base terminal and the emitter terminal, respectively.

The NPN transistor (Q2) 162 connects the light emitting diode 166 in series to the emitter terminal.

The PNP transistor (Q1) (161) has a collector terminal and a resistor (R7) (165) connected in series.

When the temperature detected by the temperature detector 140 reaches the operating temperature, the microcomputer 150 generates a pulse to the resistor R4 to turn on the PNP transistor Q1 161 and the NPN transistor Q2 162 to operate. let the current flow

When the NPN transistor (Q2) 162 is turned on, the light emitting diode 166 emits light.

The microcomputer 150 is electrically connected to the receiver 170 to receive and process control signals from the receiver 170.

The operating principle of the differential fire detection device 100 configured as described above is as follows.

The microcomputer 150 periodically detects the first temperature detected by the temperature detector 140, and sends a pulse to the resistor R4 when the detected first temperature exceeds room temperature + a preset temperature increase rate (30°C). The fire detector 110 is operated by turning on the PNP transistor (Q1) 161 and the NPN transistor (Q2) 162 of the operating current unit 160 so that the operating current flows.

Then, when the operating current of the fire detector 110 flows, the receiver 170 electrically connected to the fire detector 110 cuts off the power supplied to the fire detector 110 one or more times within a preset accumulation time. Then, after a few seconds, it performs the accumulation function to re-apply power.

The accumulation function of the receiver 170 is set as a pre-stored program to cut off power 1 or 2 times within 30 seconds and re-apply power after 1 second.

The microcomputer 150 detects a second temperature from the temperature detector 140 when power is applied after a few seconds after power is cut off within the accumulation time (eg, 30 seconds) according to the accumulation function of the receiver 170, and , When the detected second temperature is equal to or less than room temperature + a preset temperature increase rate (50° C. or less), it is recognized as a malfunction of the fire detector 110 and reset to an initial value. When the fire detector 110 is reset, the receiver 170 is also automatically reset.

When the microcomputer 150 is turned on and off within the storage time of the receiver 170, the existing room temperature (20° C.) + the preset temperature rise rate (30° C.) is stored and maintained without being reset.

For example, if the fire determination criterion is room temperature (20 ° C) + a preset temperature increase rate (30 ° C), the fire detector 110 detects 60 degrees due to a rapid increase in temperature such as a lighter, meat grilling, electromagnetic waves, lightning, etc. in a local area. When °C is sensed as the first temperature, the receiver 170 shuts off the power one or two times within 30 seconds as an accumulation function, and reapplies power after a few seconds.

When the fire detector 110 detects the second temperature through the temperature detector 140, when it is measured as room temperature (20 ° C) + a preset temperature increase rate (30 ° C), that is, 50 ° C or less, that is, the first temperature If it is lower than that, it is determined as a temporary malfunction of the fire detector 110 and the fire detector 110 is reset to an initial value.

The fire detector 110 may prevent a temporary malfunction caused by a rapid rise in temperature in a local area.

The aforementioned microcomputer 150 sets a series of malfunction determination processes, such as temperature detection and initial value reset due to temporary malfunction recognition, as pre-stored programs.

The receiver 170 can control to change the accumulation time, the number of times power is turned on and off, and the power re-apply time.

For example, the receiver 170 adjusts the power supplied to the fire detector 110 to a preset accumulation time of 1 minute, cuts off the power at 1 second, cuts off the power again at 60 seconds, and then turns off the power. It may also perform the accumulation function of reapplying.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. that fall within the scope of the right.

100: differential fire detection device
110: fire detector
120: rectification processing unit
130: constant voltage conversion unit
140: temperature detector
150: microcomputer
160: operating current unit
170: receiver

Claims (6)

A temperature detection unit for detecting an ambient temperature, and a microcomputer for periodically sensing a first temperature detected by the temperature detection unit and for flowing an operating current when the detected first temperature exceeds room temperature + a preset temperature increase rate. one fire detector; and
It is electrically connected to the fire detector, and when the operating current of the fire detector flows and operates, the power supplied to the fire detector is cut off one or more times within a preset accumulation time and then re-applied power after a few seconds. Including a receiver that performs the function,
The microcomputer detects a second temperature from the temperature detector when power is applied after a few seconds after power is cut off within the accumulation time according to the accumulation function of the receiver, and the detected second temperature is room temperature + a preset temperature. If the temperature rise rate is less than the differential fire detection device for recognizing the fire detector as a malfunction and resetting it to an initial value. The method of claim 1,
When the micom is turned on and off within the accumulation time of the receiver, the room temperature + the preset temperature rise rate is stored and maintained as it is without being reset. The method of claim 1,
The differential fire detection device that controls the receiver to change the accumulation time, the number of power on/off, and the power re-apply time. The method of claim 1,
The fire detector includes a rectification processing unit for rectifying power supplied from the receiver;
a constant voltage conversion unit for converting the power rectified through the rectification processing unit into a constant voltage;
The temperature detection unit detects and detects a temperature change;
the micom detecting a temperature change in the temperature detection unit and determining whether or not a fire has occurred; and
and an operating current unit generating an operating current under control of the micom when the temperature detected by the temperature detector reaches an operating temperature. The method of claim 4,
The temperature detector is an NTC thermistor, which is a temperature sensor, one end of the NTC thermistor is connected in series to a resistor (R5), and the other end of the NTC thermistor is connected to port 5 of the micom in parallel with a wire, A resistor (R3) and a capacitor (C8) are connected in parallel, respectively, and the other end of the NTC thermistor is connected to port 6 of the micom by a resistor (R3). The method of claim 4,
The operating current part includes a PNP transistor (Q1), an NPN transistor (Q2), a capacitor (C3), a resistor (R6), a resistor (R7), and a light emitting diode (166),
Port 3 of the micom is connected to the base terminal of the NPN transistor (Q2) by a resistor (R4), the NPN transistor (Q2) is connected to the collector terminal and the base terminal of the PNP transistor (Q1), The PNP transistor (Q1) connects the capacitor (C3) and the resistor (R6) in parallel between the base terminal and the emitter terminal, respectively, and when the temperature detected by the temperature detection unit becomes the operating temperature, the microcontroller A differential type fire detection device in which a pulse is generated in (R4) to turn on the PNP transistor (Q1) and the NPN transistor (Q2) so that an operating current flows.

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