JPH0342550Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to a smoke pipe type fire detector installed on ships, mainly cargo ships.

<Prior art> Traditionally, smoke tube type fire detectors guide air or smoke from each warning area through a conduit into a dark room equipped with a light emitting/receiving section, detect scattered light due to the presence of smoke, and notify that a fire has occurred. was. This also turns on the light source for visual inspection installed in the dark room, switches the above-mentioned conduits one after another so that only air from one restricted area flows into the dark room, and detects scattered light caused by the presence of smoke through the viewing window. The area where the fire occurred was determined by In addition, the light source for visual inspection is
A weak current was constantly passed through this light source, and a failure of the light source was detected when the current stopped.

<Problems with the prior art> However, with the above device, a person is always present at the location where the receiving panel is installed, and upon receiving a fire alarm, they must immediately manually turn on the visual light source and switch the conduits to determine the fire area. There were drawbacks, such as the need for fire detection, the time required for detection, and the inability to know the area where the fire occurred elsewhere.

<Means for solving the problem> In view of the above points, this invention is designed to detect scattered light based on the presence of smoke in smoke tube type fire detectors corresponding to the pipes that intake air or smoke in the restricted area. a darkroom equipped with a light emitting/receiving section; an alarm circuit that detects a predetermined amount of scattered light generated in the darkroom and generates a fire alarm signal and a fire district signal; The light source for confirmation includes a limiting resistor that constantly flows a weak current,
A disconnection detection circuit for detecting the presence or absence of this weak current, and a current increasing circuit for short-circuiting the limiting resistor in response to the fire alarm signal are provided.

<Function> The fire detector of this invention displays the occurrence of a fire and the fire area using the light emitting/receiving section provided corresponding to the conduit that takes in air or smoke in each warning area, and also uses a light source for visual inspection to increase the flow of light. It will be possible to visually confirm that a fire has broken out in the area. Additionally, if there is a break in the visual light source, a failure alarm is immediately issued.

<Example> An example of this invention will be described below with reference to the drawings.

In the figure, A1 to An are each hold as a fire warning area, B1 to Bn are intake pipes piped from each hold A1 to An to the wheelhouse, and C1 to Cn are each pipe B1.
This is a scattered light type smoke detection unit installed in ~Bn.
Each smoke detection section C1 to Cn is as shown in FIG.
A dark room 1, a light projecting section 2 therein, a light receiving section 3 provided in a position where the light is not directly irradiated, an intake pipe connection port 4, an exhaust pipe connection port 5, a viewing window 6, and a viewing window 6. a light emitting diode LED1 as a light source;
It is composed of a circuit (not shown) that detects a predetermined output of the light receiving section 3, that is, a predetermined amount of scattered light. B
1' to Bn' are exhaust pipes connected to a compressor (not shown), G is an OR circuit connected to the outputs of smoke detectors C1 to Cn, and the outputs are the fire indicator lights La,
Relay F for fire level Bl and fire alarm signal
connected to. Further, the smoke detection units C1 to Cn are connected to fire area indicator lights L1 to Ln and fire area signal relays N1 to Nn, respectively. In addition, light emitting diode LEDs for visual inspection of each of the above smoke detection parts C1 to Cn
As shown in FIG. 3, each of the circuits 1 is provided with a current limiting resistor R1 in series and a failure detection circuit 7 in parallel. The failure detection circuit 7 includes a resistor R2
The Zener diode ZD connected in series with the LED1 and the light emitting diode LED1 failed and the Zener diode ZD
Transistor Tr1 turns ON when conducts.
and a transistor Tr2 that turns on when the transistor Tr1 turns on. 8 is a failure display circuit operated by the output of the failure detection circuit 7, which is connected in parallel to the transistor Tr3, which is always turned on by resistors R3 and R4, the relay T provided on its collector side, and the transistor Tr3. Make setting f2 of fire alarm relay F,
It consists of a break contact t of a relay T and a light emitting diode LED2 as a failure indicator connected in series, and the collector side of the transistor Tr2 is connected to the base of a transistor Tr3. In addition
dc is a contact that is closed when the backup power supply fails. Reference numeral 9 denotes a current increasing circuit for increasing the current of a light emitting diode LED1 serving as a visual light source, and is configured by connecting a limiting resistor R1 and a make contact f2 of a fire alarm relay F in parallel.

Next, the operation of the above fire detector will be explained.

The air in each hold A1 to An is inlet pipe B1.
～Bn and the associated smoke detection parts C1～Cn and exhaust pipe B
It is discharged from the compressor through 1' to Bn'. Further, a weak current is applied to the visual light emitting diode LED1 of each of the smoke detection units C1 to Cn through a resistor R1.

By the way, when a fire breaks out in the hold A1 and smoke flows into the smoke detection section C1 through the intake pipe B1, scattered light generated in the dark room is detected by the light receiving section 3.
The fire indicator light La is lit through the OR circuit G and the fire bell Bl is sounded. Furthermore, the fire area indicator light L1 is lit to indicate that a fire has occurred in the hold A1, and the information is transferred to another location through the contacts of relays F and N1. Also, the make contact f of the above relay F
1 is also closed, resistor R1 is shorted, and the light emitting diode
The current flowing through LED 1 is increased, so when you look into the dark room 1 through the viewing window 6, the inside becomes bright due to light scattered by the smoke, and it can be confirmed by visual observation that smoke from a fire has occurred in this area. . In addition,
If you look into the dark room 1 and find that it is dark, it is possible that the smoke detector C1 has malfunctioned due to electrical noise, etc., so it is best to immediately head to the scene to investigate without activating the fire extinguishing system. can.

Further, when the visual light emitting diode LED1 is disconnected, the Zener diode ZD becomes conductive and the transistors Tr1 and Tr2 are turned on. This allows you to always
Transistor Tr3, which was ON, turns OFF, relay T is restored, contact t is closed, and the fault indicator light is turned off.
LED2 is lit. Furthermore, when the standby power supply fails and the break contact dc of the relay that uses it as a power source closes, the transistor Tr3 is turned off, as in the case of a visual light source, the relay T is restored, and the failure indicator LED2 is turned on.

<Effects> The fire detector of this invention has a smoke detection section for each warning area, and uses the output to issue a fire alarm and display the fire area, so it can be automatically transmitted even when moving to a distant location. In addition, since the fire alarm is issued and the current to the visual light source is increased, it is possible for people to immediately confirm the occurrence of a fire.
Furthermore, since only a weak current is constantly flowing, it is possible to obtain a smoke tube type fire detector equipped with a disconnection detection circuit that consumes less current.

[Brief explanation of drawings]

Figure 1 is a block circuit diagram of the smoke tube type fire detector of this invention, Figure 2 is a schematic diagram of the smoke detection section of Figure 1,
FIG. 3 shows a disconnection detection and display circuit for the visual light source shown in FIG. A1~An...Hold, B1~Bn...Intake pipe, B
1'~Bn'...exhaust pipe, C1~Cn...smoke detection section,
LED1...Light emitting diode as a visual light source, R1...Limiting resistor, 1...Dark room, 2...Light emitter, 3...Light receiving unit, 6...Visual window, 7...Failure detection circuit, 8 ...Failure indication circuit.

Claims (1)

[Scope of utility model registration request] A darkroom is equipped with a light emitting/receiving unit for detecting scattered light due to the presence of smoke, corresponding to each pipe that takes in air or smoke in the warning area, and a predetermined amount of scattered light generated in the darkroom is detected to detect a fire. An alarm circuit that generates an alarm signal and a fire area signal is provided, and the light source for visual confirmation installed in the dark room has a limiting resistor that constantly supplies a weak current to the light source, and a circuit that detects the presence or absence of this weak current. 1. A fire pipe type fire detector, characterized in that it is provided with a disconnection detection circuit for detecting a disconnection detection circuit, and a flow increasing circuit for short-circuiting the limiting resistor in response to the fire alarm signal.