JPS5914800B2 - Fire and intrusion detection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire/intrusion detection device capable of detecting fire and intruder with one device.

Conventionally, as shown in FIG. 1, a differential distribution type fire detector has been known to have a plurality of serially connected thermocouple junctions 21, each of which has a linear heat-sensitive section 22 with a large heat capacity at every other junction point. It is being

This is because when the sensing part is given a temperature rise rate exceeding a certain value due to the rising air current generated by a fire, a temperature difference occurs between the junction point 21 of the low heat capacity part and the junction point 22 of the high heat capacity part, and this temperature difference causes heat to be generated. The device is configured to detect electromotive force and issue a fire alarm.

On the other hand, a reed switch that closes the circuit using a magnet and magnetic field is installed on a window, door, etc. and its frame, etc. When the window, etc. is closed, the reed switch closes the circuit, but if the window, etc. is opened by an intruder, the reed switch closes. Intrusion detectors that detect an open circuit and issue an alarm are also known.

The former type of fire detector is installed near the ceiling of all the rooms in the area requiring vigilance, with each room connected in series.

Also, in the case of the latter intrusion detector, all the windows of each room are connected and installed in series.

Therefore, if both are done on the same line, the installation work will be simplified and the effect will be great.

The present invention was proposed to achieve the above object, and its purpose is to detect fire and intrusion (gaps between windows, etc.) using a single linear detection line.

Hereinafter, the fire and intrusion detection device of the present invention will be explained along with the drawings.

FIG. 2 shows an embodiment of the device according to the invention.

In the figure, 1 is the detection line, and between terminals a and b,
Heat sensitive part of differential distribution type sensor 11. A contact piece 12 of the reed switch that is activated depending on the presence or absence of an intruder, a heat-sensitive portion 11 of the differential distribution type sensor, and a contact piece 12' of the reed switch are connected in series.

13 and 13' indicate magnets for operating the reed switch.

Terminal A is grounded, and terminal a is connected to DC power supply 3 through resistor 2.
The negative side of the power supply is connected to the positive side of the power supply, and the negative side of the power supply is grounded.

Furthermore, the terminal a has a voltage detection circuit 4 having a threshold value ■, and a threshold value v
It is connected to the voltage detection circuit 5 having the voltage detection circuit 2.

The relationship between the threshold values V1 and V2 is ■1>■2.

The voltage detection circuit 4 is connected to an intrusion indicator 7 (indicator light, etc.), and the voltage detection circuit 5 is connected to a fire indicator 8 via a prohibition circuit 6.

Furthermore, the terminal d of the inhibiting circuit 6 is connected to the voltage detecting circuit 4, and when there is an input to the terminal d, the inhibiting circuit is in an open state, and no signal is transmitted from the voltage detecting circuit 5 to the display 8.

Reference numeral 9 denotes an OR circuit to which outputs from both voltage detection circuits 4 and 5 are applied, and the output is applied to an alarm device 10 such as a buzzer.

Next, the operation will be explained.

(g) In normal conditions, there is no electromotive force due to the heat sensitive part (thermocouple) 11, and the current flowing from the power source 3 through the resistor 2 causes a ground fault because the reed switch is closed, and the two voltage detection circuits 4, There is no voltage input to 5.

(b) When a fire occurs, thermoelectromotive force (for example, several mV) is generated, but this is only detected by the detection circuit 5 and not detected by the detection circuit 4.

This is because the threshold value of the detection circuit 4 is high.

e→ When the reed switch operates and opens, the detection circuit 4
, 5 generates a voltage equal to that of the power supply 3 (for example, several volts), and the detection circuits 4 and 5 also operate.

That is, only the detection circuit 5 is activated in the event of a fire, and the detection circuits 4 and 5 are activated when a window or the like is opened.

When the detection circuits 4 and 5 are activated, the output of the detection circuit 4 is input to the inhibition circuit (gate) 6, so the signal from the detection circuit 5 does not reach the fire indicator 8, and the indicator 8 does not operate. Since the information is input to the intrusion display I, "intrusion" is displayed.

If only the detection circuit 5 is activated, this signal passes through the inhibit circuit 6 and activates the fire indicator 8.

In either case, OR with the outputs of detection circuits 4 and 5 as inputs
The circuit (OR circuit) activates the alarm device 10 such as a buzzer to perform an alarm operation.

In the present invention, one terminal of a detection line consisting of a differential distributed sensor and a reed switch that is activated depending on the presence or absence of an intruder is grounded, and the other terminal is connected to a DC power source via a resistor. , and are connected to two voltage detection circuits with different threshold values, and the first voltage detection circuit is connected to an indicator for displaying an abnormal state via an inhibition circuit, and the inhibition circuit is connected to a second voltage detection circuit with a different threshold value. If the circuit has an output, it is configured so that its operation is prohibited, so one device can detect the presence or absence of a fire and the presence of an intruder, so the detection device and detection wiring can be This has the effect of simplifying the process.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a differentially distributed thermocouple type sensing wire, and FIG. 2 is a diagram of the fire and intrusion detection device of the present invention. 1...Detection line, 2...Resistance, 3.
. . . Power supply, 4 . . . Voltage detection circuit having a threshold value ■, 5 . ...Intrusion indicator, 8...Fire indicator, 9...OR circuit, 10...Alarm, 11...Differential distribution Heat-sensitive part of type sensor, 12, 12'--... Contact piece of reed switch, 13, 13'... Magnet.

Claims (1)

[Claims] 1 One terminal of a detection line consisting of multiple differential distribution sensors and reed switches connected in series, which are activated depending on the presence or absence of an intruder, is grounded, and the other terminal is connected to a DC power source via a resistor and set to a threshold value. The output terminal of the first voltage detection circuit with a lower threshold is connected to an intrusion indicator for indicating an abnormal condition, and the output terminal of the second voltage detection circuit with a lower threshold is connected to two voltage detection circuits with different threshold values. The output terminal is connected to a fire indicator for indicating abnormal conditions through a prohibition circuit,
The prohibition circuit is configured such that its operation is prohibited by the output of the first voltage detection circuit, and the output terminals of the two voltage detection circuits are connected to an alarm via an OR circuit. Fire and intrusion detection equipment.