JP2015026322A - Fire sensor and fire alarm facility using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that when an external input is performed in a non-contact state, it takes a long time to confirm the result of the external input, or that when the result is found out in another place, whether or not a fire sensor has detected the external input is not recognized, causing an operator to continue an operation of performing the external input.SOLUTION: A fire sensor 30 is connected to a sensor line 20 extended from a fire receiver 10, and configured to output a fire signal to the sensor line 20 in accordance with a switching operation when a fire is detected. The fire sensor 30 includes: an external input detection part 32 for detecting an external input in a non-contact state; and a display part 33 for displaying the fact that the external input detection part 32 has detected the external input in a predetermined time.

Description

  The present invention relates to a fire detector that displays that non-contact external input has been detected, and a fire alarm system using the fire detector.

Conventionally, as an example of non-contact external input, there is a fire detector that executes a predetermined function or switches modes when a magnet is brought close to a magnet switch built in the fire detector. (For example, see Patent Document 1)
When a non-contact external input is performed, the fire detector performs a predetermined function in a short time, and if the result can be confirmed by the fire detector, the external input is detected by the fire detector. I understand that.

JP 09-062961 A

  However, if it takes a long time until the result of executing the specified function can be confirmed by the fire detector, if the specified function is displayed on a device installed at a location away from the fire detector, or after switching the mode When it is understood that the mode has been switched by performing the above operation, the worker did not know whether the fire detector detected an external input, and the worker had to continue the external input operation.

  A fire detector according to the present invention is a fire detector that is connected to a sensor line extending from a fire receiver and outputs a fire signal to the sensor line by a switching operation when a fire is detected. The sensor includes an external input detection unit that detects an external input by non-contact and a display unit that displays that the external input detection unit has detected the external input for a predetermined time.

  The fire detector according to the present invention is characterized in that the display unit displays that an external input has been detected by continuously blinking at predetermined time intervals for a predetermined time.

  The fire detector according to the present invention displays the fact that the display unit has detected an external input by continuously flashing over a predetermined time at alternate intervals of a first predetermined time and a second predetermined time. .

  The fire alarm system according to the present invention detects whether a fire signal is output to the sensor line when the fire detector is connected, and detects when a fire signal is continuously detected a predetermined number of times. It is characterized by performing an operation.

According to the present invention, it is possible to notify the worker that the fire detector has detected an external input, so that the worker can continue the external input or perform unnecessary work to operate continuously. Absent.
Also, the fire receiver can be prevented from malfunctioning due to the current increasing to display the external input.

It is a schematic block diagram which shows an example of the fire alarm equipment containing the fire detector which concerns on embodiment of this invention. It is an example of the operation timing of the fire receiver and fire detector which concern on embodiment of this invention. It is a flowchart figure which shows an example of operation | movement of the fire detector which concerns on Embodiment 1 of this invention.

Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of a fire alarm facility 1 according to Embodiment 1 of the present invention.

  The fire alarm system 1 includes a fire detector 30 installed in each room or common area of a building (for example, a housing complex such as a hotel or a condominium, an office building, or a commercial facility), and a detection result of the fire detector 30. A P-type fire receiver 10 (hereinafter referred to as fire receiver 10) that performs a warning based on the sensor line 20 is connected. A termination resistor 40 is connected to the end of the sensor line 20.

  The fire sensor 30 is connected so as to straddle the common line 21 and the line line 22 which are the sensor lines 20, and the voltage between the common line 21 and the line line 22 is changed to thereby change the voltage to the sensor line 20. The flowing current is changed, and the fire receiver 1 is notified of a fire or performance degradation as an abnormal signal.

  Here, in FIG. 1, only a pair of sensor lines 20 extending from the fire receiver is shown, but a plurality of sensor lines 20 may be extended from the fire receiver. Further, only two fire detectors 30 are shown, but a predetermined number (for example, 30) of fire detectors 30 can be connected to the sensor line 20.

  The terminating resistor 40 indicates that the sensor line 20 is not disconnected by passing a minute current that is larger than the maximum current consumption of the entire fire sensor 30 connected to the sensor line 20 to the sensor line 20. It is.

(Fire receiver configuration)
The fire receiver 10 includes a line power supply unit 11, a conversion unit 12, a state determination unit 13, an alarm display unit 14, and an acoustic unit 15.
The line power supply unit 11 converts an AC voltage supplied from a commercial power supply (not shown) into, for example, DC 24V, and is supplied to the detector line 20 as a power source for the fire detector 30 and energized. The line power supply unit 11 is a power supply circuit including a transformer and a smoothing circuit, or an AC / DC conversion power supply device.

  The conversion unit 12 is supplied from the power supply circuit unit 11 to the sensor line 20, and converts the current flowing through the common line 21, each fire detector 30, the termination resistor 40, and the line line 21 into a voltage by the current-voltage conversion circuit. The voltage is converted into a digital value. The current-voltage conversion circuit is, for example, a circuit having only a resistor, and allows a current to flow through the resistor to generate a voltage at both ends of the resistor, or a circuit using an operational amplifier to input a current and output a voltage. The converted voltage is converted into a digital value by an AC / DC converter.

  The state determination unit 13 has a fire threshold and a disconnection threshold for determining whether the sensor line 20 is normal, fire, or disconnection. The state determination unit 13 compares the digital value converted by the conversion unit 12 with each threshold value to determine the state of the sensor line 20, thereby detecting an abnormality in the fire sensor line 20, and detecting fire detection. The fire signal from the container 30 is received. The state determination unit 13 performs the above determination every predetermined period, and determines that the abnormality of the sensor line 20 or the fire signal from the fire detector 30 has been received when the same determination result continues for a predetermined number of times. This prevents malfunction due to transient factors such as noise.

Note that, similarly to the state determination unit 13, the conversion unit 12 may operate every predetermined cycle to convert the current value into a digital value.
Further, the conversion unit 12 and the state determination unit 13 are not limited to the above, the conversion unit 12 outputs a converted voltage without being converted into a digital value, and the state determination unit 13 compares the output voltage with a comparator. The state of the sensor line 20 may be determined by a voltage comparison circuit configured by the above.

The alarm display unit 14 and the acoustic unit 15 are alarm units that warn of occurrence of a fire or abnormality.
The alarm display unit 14 includes an indicator lamp, an LCD device, and the like, and performs a visual alarm.
The acoustic unit 15 includes a buzzer, a speaker, and the like, and performs an acoustic alarm.

(Fire detector configuration)
The fire sensor includes a smoke sensor, a heat sensor, a flame sensor, and the like. Here, a heat sensor that detects a fire by detecting heat generated in a fire will be described as an example.
The fire sensor 30 includes a fire detection unit 31, an external input detection unit 32, a display unit 33, and a state output unit 35.

  The fire detection unit 31 detects heat generated in the event of a fire and makes a fire determination, and has a temperature detection element (for example, a thermistor or a thermopile) (not shown). The fire detection unit 31 calculates a temperature based on a change in voltage, resistance, or the like output from the temperature detection element, determines a fire based on whether or not the ambient temperature has reached a fire level, and detects a fire.

  The external input detection unit 32 has a reed switch (not shown) that is turned on when a magnet is brought close as a non-contact external input unit, determines the state of the reed switch, and when the reed switch is turned on Detects the presence of external input. The external input unit is not limited to a reed switch. For example, a coil that flows a current when receiving radio waves of a predetermined frequency, a circuit that turns on a switch when receiving radio waves of a predetermined frequency, or wireless communication, What is necessary is just to be able to change a state without contact from the outside. Also, it may be detected that there is an external input when it is normally turned on and turned off.

  Here, it is assumed that the external input detection unit 32 functions for external sensitivity setting, and switches the fire level of the fire detection unit 31 to a temperature of 65 degrees, 70 degrees, and 75 degrees. Note that the function of the external input detection unit 32 is not limited to the switching of the fire level. For example, when the input is detected, the internal input of the external input detection unit 32 is self-checked. It is possible to detect execution inputs of various functions such as notification.

  The display unit 33 includes an indicator lamp 34 such as an LED and a display lamp control circuit (not shown) that turns on the indicator lamp, and detects when the fire detection unit 31 detects a fire or when the external input detection unit 32 has an external input. When this is done, the indicator lamp control circuit controls lighting of the indicator lamp 34 and performs lighting display.

  When the fire detection unit 31 detects a fire, the state output unit 35 is in a low impedance state, lowers the line impedance of the sensor line 20, and allows more current to flow through the sensor line 20 than normal. This notifies the fire receiver 10 that a fire has been detected.

(Fire receiver operation)
The fire receiver 10 operates as follows.
The current flowing through the sensor line 20 is in the case of disconnection <normal time << fire, and the fire receiver 10 determines the occurrence of fire or disconnection by determining the current flowing through the sensor line 20.
In order to monitor the state of the sensor line 20, the conversion unit 12 converts the current flowing through the sensor line 20 into a voltage by a current-voltage conversion circuit, and converts the converted voltage into a digital value.

  The state determination unit 13 determines whether the digital value converted by the conversion unit 12 is equal to or greater than the fire threshold at a time interval T1 (for example, 20 ms) indicated by a vertical line in FIG. . The state determination unit 13 determines that the fire signal has been received when the fire threshold value or more continues for a plurality of times (for example, 5 times). When the determination of the fire signal reception is confirmed, the state determination unit 13 notifies the alarm display unit 14 and the sound unit 15 of the occurrence of the fire. When the notification is received, the alarm display unit 14 displays a fire alarm as a fire alarm, the acoustic unit 15 sounds a fire alarm, and the fire receiver 10 warns of the occurrence of a fire.

  Similarly to the determination of reception of the fire signal, the state determination unit 13 determines that the termination resistor 40 has dropped, that is, the sensor line 20 has been disconnected, when the disconnection threshold value or lower continues for a plurality of times. When the state determination unit 13 determines that the disconnection has occurred, the state determination unit 13 notifies the alarm display unit 14 and the sound unit 15 of the occurrence of the disconnection. When the notification is received, a disconnection alarm is displayed as a disconnection alarm, and the acoustic unit 15 sounds a disconnection alarm and warns the occurrence of disconnection in the fire receiver 10.

  Further, since the digital value is normal when the disconnection threshold is exceeded and less than the fire threshold, the fire receiver 10 does not give any alarm.

(Fire detector operation)
The operation of the heat sensor, which is an example of the fire sensor 30, will be described with reference to FIG.
The fire detection unit 31 calculates the temperature based on the output of the temperature detection element, and detects the ambient temperature (S301). The fire detection unit 31 determines whether the ambient temperature is equal to or higher than the fire level (S302). If the fire level is equal to or higher than the fire level in S302, the fire detection unit 31 detects a fire (S303), and continuously lights the indicator lamp 34 of the display unit 33 to alert the fire detector 30 of the fire. In addition, the fire detection unit 31 notifies the state output unit 35 of fire detection. When receiving a fire detection notification, the status output unit 35 enters a fire impedance state, outputs a fire signal by flowing a larger current through the sensor line 20 than during normal times and abnormal conditions, and a fire is generated in the fire receiver. Is notified (S304). Thereafter, the process returns to S301.

When the ambient temperature is lower than the fire level in S302, the external input detection unit 32 detects the external input (S305), and when the external input is detected, notifies the display unit 33 and the fire detection unit 31 that there is an external input. Upon receiving the notification, the display unit 33 turns on the indicator lamp 34 for a predetermined time in order to notify the worker that an external input has been entered (S306). The fire detection unit 31 that has received the notification changes the fire level (S307). Thereafter, the process returns to S301. If no external input is detected in S305, the process also returns to S301.
The fire level is changed in the order of 65 degrees, 70 degrees, and 75 degrees, and after 75 degrees, a loop operation that returns to 65 degrees is performed.

Here, lighting of the indicator lamp 34 of the display unit 33 when an external input is detected will be described with reference to FIG. In FIGS. 2B to 2E, the indicator light is turned on when the line is on the upper side, and the indicator light is turned off when the line is on the lower side.
When the indicator lamp 34 is turned on, the current flowing through the sensor line 20 increases. When the fire threshold of the fire receiver 10 is set to a value that does not determine that a fire signal has been received even if the current flowing through the sensor line 20 increases due to the lighting of the indicator lamp 34, as shown in FIG. It can be lit continuously for a predetermined time.

  However, if a large amount of current does not flow, the indicator lamp 34 does not light, or the difference between the normal current flowing through the sensor line 20 and the current that the fire receiver 10 determines to receive a fire signal is small. If the indicator lamp 34 is continuously lit for a predetermined time as shown in FIG. 2B, the fire receiver 10 may determine that a fire signal has been received, and may erroneously determine a fire.

  Therefore, as shown in FIGS. 2C to 2E, if the indicator lamp 34 is intermittently turned on (continuously flashed) at predetermined intervals over a predetermined time, the fire receiver 10 is activated by the lighting of the indicator lamp 34. Can be determined not to receive a fire signal. In general, the time resolution of the human eye is about 50 ms to 100 ms, and blinking for a short time is perceived as being continuously lit.

FIG. 2C shows a lighting method of the indicator lamp 34 when the fire signal reception determination interval T1 of the fire receiver 10 is less than 50 ms. The lighting interval T2 is set longer than T1. Thereby, it is not continuous that the indicator lamp 34 is lit when the fire signal is received by the fire receiver 10.
FIG. 2D shows a lighting method of the indicator lamp 34 when the fire signal reception judgment interval T1 of the fire receiver 10 is 50 ms or more. The lighting interval T3 is set shorter than T1 and the fire signal reception judgment is performed. It is set so that it does not become the same timing continuously or several times continuously. For example, if T1 is 100 ms and T3 is set to 30 ms, the indicator 34 is not continuously turned on when the fire receiver 10 determines fire signal reception.

  FIG. 2E shows a method in which the lighting of the indicator lamp 34 is alternately performed at two time intervals of T4 (for example, 17 ms) and T5 (for example, 31 ms). If T4 and T5 are made prime numbers, the fire receiver 10 It is possible to reduce the probability that the indicator lamp 34 is continuously lit when it is determined that the fire signal is received. In this way, if the indicator lamps 34 are alternately lit at different time intervals as shown in FIG. 2 (e), the fire detector 30 is connected to a fire receiver with a time interval of determination of fire signal reception of, for example, 80 ms. Even if it is connected, even if it is connected to a fire receiver with a time interval of 100 ms, the indicator lamp 34 will not be lit when it is determined that the fire receiver 10 has received a fire signal continuously or continuously. In any of FIGS. 2C to 2E, the lighting time of the indicator lamp 34 is appropriately determined so as not to be the same timing a plurality of times after the fire determination timing T1.

  As described above, according to the fire detector 30 according to the present embodiment, it is possible to notify the operator that the non-contact external input has been entered by turning on the indicator lamp 34. In addition, according to the fire alarm facility 1 according to the present embodiment, the operator can be informed by the lighting of the indicator lamp 34 that the fire receiver 10 does not malfunction and that a non-contact external input has been entered. .

DESCRIPTION OF SYMBOLS 1 Fire alarm equipment, 10 Fire receiver, 11 Line power supply part, 12 Conversion part, 13 State determination part, 14 Alarm display part, 15 Sound part, 20 Sensor line, 21 Common line, 22 line line, 30 Fire detector , 31 Fire detection unit, 32 External input detection unit, 33 Display unit, 34 Indicator lamp, 35 Status output unit, 40 Termination resistance

Claims (4)

A fire detector connected to a sensor line extending from a fire receiver and outputting a fire signal to the sensor line by a switching operation when a fire is detected,
The fire detector includes an external input detection unit that detects an external input by non-contact and a display unit that displays that the external input detection unit has detected an external input for a predetermined time. vessel.   The fire detector according to claim 1, wherein the display unit displays that an external input is detected by continuously blinking at predetermined time intervals for a predetermined time.   3. The fire according to claim 2, wherein the display unit displays that an external input has been detected by blinking continuously at alternate intervals of a first predetermined time and a second predetermined time over a predetermined time. sensor. The fire detector according to claim 2 or claim 3 is connected to a sensor line,
The fire receiver detects whether or not a fire signal is output to the sensor line at a predetermined cycle, and performs a warning operation when the fire signal is continuously detected a predetermined number of times. Notification equipment.

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