JP2586920Y2 - Differential distributed fire detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential distributed fire detector provided with an indicator light circuit.

[0002]

2. Description of the Related Art Conventionally, a differential type distributed fire detector has a disadvantage that whether or not it has been operated can be confirmed only at the receiver side. Therefore, at the time of maintenance and inspection, the receiver side and the detector side are at a disadvantage. Inspection personnel were divided and carried out maintenance and inspection while keeping in touch. In addition, during maintenance and inspection, it is necessary to inspect the detector in more detail depending on whether there is a false alarm.However, it is difficult to connect multiple differential fire detectors to the same line of the receiver because they will recover themselves. Was.

At the time of maintenance and inspection of the differential type distributed fire detector, a pump test is usually performed.
Connect the syringe to the sensor and inject air into the air tube,
By measuring the time from injecting air into the air pipe until the normally open contact becomes closed (operating time) and the time until the normally open contact 1 becomes open again (duration), the quality of the sensor is determined. Have judged.

In order to measure the operating time and the duration, a circuit in which the normally open contact 1 and the operation indicator circuit 20 are connected in series as shown in FIG. 4 can be considered. If a plurality of receivers are connected to the same line for recovery, there is a disadvantage that it becomes impossible to identify which sensor has issued the alarm later. Further, if a circuit in which the normally open contact 1 and the operation indicator lamp circuit 30 are connected via the self-holding circuit 4 as shown in FIG. Measurement becomes difficult.

[0005] The present invention has been made in view of the above points, and it is possible to identify which detector has issued a warning even when a plurality of differential distributed fire detectors are connected to the same line of a receiver. An object of the present invention is to provide a differential distributed fire detector which can perform maintenance and inspection easily by one person.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a differential type having a pair of terminals connected to a pair of power / signal lines extending from a receiver or a repeater. In the distributed fire detector, a normally open contact that detects a temperature rise of not less than a predetermined value and closes between the terminals, a first operation indicator light circuit that lights up based on the closed state of the normally open contact, A self-holding circuit that is turned on when the contact is closed, and a second operation indicator circuit that lights up based on the on-operation of the self-holding circuit are provided.

[0007]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which a pair of terminals L and C connected to a pair of power / signal lines extending from a receiver or a repeater and the terminals thereof. Between L and C,
A first contact having a normally open contact 1 for closing the contact by expansion of air using a diaphragm, and an indicator light 22 composed of an LED;
A second operation indicator light having a self-holding circuit 4 using an SCR that is turned on when the normally open contact 1 is closed, and an LED indicator light 33. A series circuit with the circuit 3 is connected.

In the event of a fire, the normally open contact 1 is closed by air expansion due to heat, the indicator lamp 22 of the first operation indicator light circuit 2 connected in series is turned on, and the normally open contact 1 is turned on by the closed circuit of the normally open contact 1. The indicator lamp 33 of the second operation indicator circuit 3 is turned on via the self-holding circuit 4, and a fire signal is transmitted to the receiver via the power / signal line.

FIG. 2 is a diagram showing a normal state of the differential distributed fire detector according to the present invention, in which a normally open contact 1 using a diaphragm, a switching cock 7 capable of selecting a monitoring mode or a test mode, and A leak resistor 6 for leaking air when the temperature rises slowly, a first and a second operation indicator lamp circuit 2,
3 includes a main body 10 having two indicator lights 22 and 33 respectively provided on the main body 3 and an air pipe 5 connected to the main body 10.

At the time of maintenance and inspection, the switching cock 7 is rotated to the test mode as shown in FIG. 3, the syringe 11 is connected to the main body, air is injected into the air pipe 5, and the operation time and duration are measured. To determine the quality of the sensor.

The first operation indicator light circuit 2 and the second operation indicator light circuit 3 are respectively operated when a predetermined amount of air is injected into the air pipe 5 by the injector 11 and the normally open contact 1 is closed. The indicator lamps 22 and 33 are turned on. Therefore, the air pipe 5
The operation time is measured by measuring the time from when air is started to be injected by the syringe 11 to when the indicator light 22 of the first operation indicator light circuit 2 is turned on. When the indicator light 22 of the circuit 2 is turned on, the syringe 11
Is fixed, the air in the air pipe 5 escapes from the leak resistance 6, the normally open contact 1 is opened again, and the time until the indicator light 22 of the first operation indicator light circuit 2 is turned off is measured. Thus, the duration can be measured.

[0012]

[Effects of the Invention] As described above, the present invention provides a
Provided with the first operation indicator light circuit 2, it is possible to reliably measure the operation time and duration during maintenance and inspection, and by providing the second operation indicator light circuit 3, Even if a plurality of differential distributed fire detectors are connected to the same line, it is possible to identify which detector has operated.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a differential distributed fire detector according to the present invention.

FIG. 2 is a diagram showing a normal state of the differential distributed fire detector of the present invention.

FIG. 3 is a diagram showing a test of the differential distributed fire detector of the present invention.

FIG. 4 is a circuit diagram of a conventional differential distributed fire detector.

FIG. 5 is a circuit diagram of a conventional differential distributed fire detector.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 normally open contact 2 first operation indicating light circuit 3 second operation indicating light circuit 4 self-holding circuit 5 air tube 6 leak resistance 7 switching cock 10 main body 11 syringe 20 operation indicating light circuit 22 indicating light 30 operation indicating light circuit 33 Indicator light

Claims (1)

(57) [Scope of request for utility model registration] 1. A differential distributed fire detector having a pair of terminals connected to a pair of power / signal lines extending from a receiver or a repeater, detecting a temperature rise of a predetermined level or more. A normally open contact that closes the terminals, a first operation indicator lamp circuit that lights based on the normally open contact, a self-holding circuit that turns on when the normally open contact is closed, A differential distributed fire detector, comprising: a second operation indicator lamp circuit that lights up based on an ON operation of the circuit.