JPS5938638B2 - Fire alarm equipment in tunnels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to fire alarm equipment in tunnels.

Conventionally, fire detectors in fire alarm systems in tunnels are different from those in general buildings, and are of the radiant type that detect fire radiation.As shown in Figure 1, multiple fire detectors 1 are installed on the wall 3 of the tunnel 2 etc. are attached at predetermined intervals.

In this case, since each fire detector 1 has only one detection part 5 facing the opposite wall, its monitoring angle is limited, so that the monitoring areas of adjacent fire detectors touch each other. Even so, it is inevitable that a non-monitoring area will be created that is not included in either of the monitoring areas. Therefore, in order to narrow this non-monitored area to an extent that does not affect fire detection, it is necessary to shorten the installation interval of each fire detector 1 as much as possible. Several fire detectors 1 had to be installed. Incidentally, in recent years, the sensitivity of radiation-type fire detectors has improved significantly and the monitoring distance has been extended, but even with improved sensitivity, with only one detection part, the monitoring angle remains the same as before, and the installation interval has to be lengthened. I can't.

In view of the above points, the present invention provides each fire detector with a pair of detecting parts whose monitoring distance is longer than the length of at least one warning area, facing both the left and right directions of the tunnel, thereby providing several detecting parts for each warning area. This eliminates the need to install a fire detector.An example of this will be explained below with reference to the drawings.In Fig. 2, 11 to 1n are tunnel 2.
Each caution area 40 to 4n separated by dotted lines on wall 30 of 0
A fire detector that detects fire radiation light installed at the boundary position of the tunnel, and a pair of detection parts 51 to 5n and 61 to 6n whose monitoring distance is longer than the length of at least one warning area are oriented toward both left and right edges of the tunnel. Each is provided.

As shown in FIG. 3, the detection units 51 to 5n and 61 to 6n of the fire detectors 11 to 1n have output terminals 40' and 4n' whose terminals 51 and 6n correspond to the caution areas 40 and 4n, respectively.
52 to 5n are directly connected to the inverter N.
Detectors 51 to 5 on the left through VLl to INVLO-1
AND circuits ANDLl to ANDLn connected to n-1
-1 to one of the input sides of the OR circuits 0R1 to 0Rn-1, and 61 to 6. -1, one of the input side is the detection section 62 to the right through the inverter INVRl to NVRO-1.
AND circuit ANDRl~ANDRO- connected to 6n
1 to the other input side of the OR circuits 0R1 to 0R0-1, and the output side of the OR circuits 0R1 to 0Rn-1 corresponds to the warning areas 41 to 40-1.
〜4n−“, respectively.

Next, the operation will be explained. For example, when a fire occurs in the warning area 43, the detection units 51 to 5n and 61 to 6n of each fire detector 11 to 1n will One or more sequentially from the leftmost one, and one or a plurality of sequentially from the rightmost one among 61 to 63 detect fire radiant light.

Then, the detection units 54 to 5n and 61 to 61 which detected the radiant light
AND circuits ANDL3 to ANDLn− connected to 63
The detection signal is input to one of the input sides of ANDR1 and ANDR1 to ANDR3.

The other input side of the AND circuits ANDL3 to ANDLO-1 and ANDR1 to ANDR3 has an inverter I whose one output is connected to the detection units 54 to 5n.
NVL3~INVLO-1 detects the left detection unit 53~
5n-1 inverted signals, and one of them is detected by the detection units 61 to 6.
3 is connected to inverter INVRl~INVR
3, the inverted signals of the right detecting sections 62 to 64 are respectively input. 5, the detection units 54 to 5n and 6
Regardless of the operation mode of 1 to 63, the AND circuit ANDL3 connected to the leftmost one closest to the fire outbreak point among 54-5n and the rightmost one closest to the fire outbreak point among 61 to 63 The AND circuit ANDR3 connected to the gate 63 operates, and its signals are input to both input sides of the OR circuit 0R3.
operates and the signal is output to the output terminal 437 corresponding to the caution area 43. Then, based on the signal, for example, a display device (not shown) displays that a fire has occurred within the warning area 43, and various disaster prevention devices are also controlled.In addition, in the above case, if the vehicle is stopped on the right side of the point where the fire occurred. If the detection unit 54 does not detect the radiation light, the AND circuit ANDL3 does not operate and no signal is input to one input side of the OR circuit 0R3, but the OR circuit 0R3 receives the signal from the AND circuit ANDR3. Therefore, in order to operate, the signal is outputted to the output terminal 43/.

Furthermore, even if the detection section 62 detects radiation light for the first time when the fire moves from the warning area 43 to 42, the AND circuit ANDR2 connected to the detection section 62 will be activated by the inverted signal of the right detection section 63. Although it does not work, the detection unit 53
The AND circuit ANDL2 connected to the left detecting section 52
The signal is operated by the inverted signal of OR circuit 0R2.
The signal is input to the output terminal 42/.

The fire detectors 11 to 1n are a pair of detection units 51 to 5n and 61 that monitor the left and right directions of the tunnel, respectively.
~6n must be provided, but both detectors 51~5n
and 61 to 6n may be configured separately or a part thereof may be configured in common.

Next, referring to the drawings, an example will be described in which a part of both the detection units 51 to 5n and 61 to 6n are configured in common.
In FIG. 4, REL and RER are the detection units 51 to 5n and 61 that monitor the left direction and right direction, respectively.
Switching circuit S controlled by oscillator 0SC in ~6n light receiving section
They are alternately switched and connected by W.

The switching circuit SW includes a direct AND circuit ANDL,
On the input side of the ANDR, there is also a discrimination circuit JU which discriminates whether there is a fire or not based on the intensity of the radiant light received by the amplifier AMP and the light receiving sections REL and RER and the time of receiving the light.
D to the other input side of the AND circuits ANDL, ANDR, and both AND circuits ANDL,
ANDR is further connected to signal generation circuits SGL and SGR activated by AND circuits ANDL and ANDR, respectively. And constant light receiving parts REL and RE
R is alternately connected to the amplifier AMP and the AND circuit ANDL, and to the amplifier AMP and the AND circuit ANDR through a switching circuit SW controlled by the oscillator 0SC. Therefore, when the switching circuit SW is switched to the light receiving section REL side and the light receiving section REL receives beam radiation, the signal is input to one of the input sides of the AND circuit ANDL and is amplified by the amplifier AMP. It is also input to the discrimination circuit JUD. Therefore, when the intensity of the radiant light reaches a predetermined value or more and this state continues for a predetermined time, the discrimination circuit JU
When D operates, its signal is input to the other input side of the AND circuit ANDL, and the AND circuit ANDL operates and a leftward detection signal is generated from the signal generating circuit SGL. Also, when the switching circuit SW is switched to the light receiving section RER side, the operation is similar to that described above, and when the intensity of the radiated light reaches a predetermined value or more and this state continues for a predetermined time, the signal generating circuit SW
A rightward detection signal is generated from GR. In addition, the above-mentioned discrimination circuit JUD is designed to judge a fire when radiant light of a predetermined value or more continues for a predetermined period of time to distinguish it from noise, so if a fire is not accompanied by a large amount of smoke, it can be judged as a fire. Since the state continues for a certain period of time, it can be determined each time the switching circuit SW switches to the light receiving part REL or RER that received the radiant light, but a large amount of smoke is generated immediately after ignition, like when gasoline etc. burns. In the case of a fire, the radiant light is blocked by the smoke, so the period in which it can be determined that there is a fire is extremely short.Therefore, even after the light receiving unit REL or RER receives the radiant light, the switching circuit SW continues to switch. and the light receiving section REL or RER on the opposite side.
Therefore, when the light receiving part REL or RER receives radiant light, the switching circuit SW switches the light receiving part REL or RER to the radiant light.
It may be configured to continue to be connected to the ER. FIG. 5 shows an example of the embodiment, which is the same as FIG. 4 except that an inhibition circuit NOT is connected between the amplifier AMP and the oscillator 0SC, and when the switching circuit SW is switched to the light receiving section REL side. When the light receiving unit REL receives radiant light, the signal is also input from the amplifier AMP to the inhibit circuit NOT, and its operation causes the oscillation of the oscillator 0SC to stop and the switching circuit S
The state in which W is switched to the light receiving section REL is maintained, and the signal of the radiant light received by the light receiving section REL is continuously inputted to one input side of the AND circuit ANDL and the discrimination circuit JUD. According to the present invention, each fire detector is provided with a pair of detection parts whose monitoring distance is longer than the length of at least one warning area, facing both the left and right directions of the tunnel, so that the monitoring angle of each fire detector is not limited. Since each detection section can monitor the entirety of at least one warning area, it is economical because it is only necessary to install each fire detector at the boundary position of each warning area.

Although it is necessary to install a pair of detection parts in the fire detector in the device of the present invention, if the light receiving side and the signal generating side are synchronized and alternately switched and connected, the middle part excluding them can be shared. Can be configured. In that case, if the switching connection is stopped when the radiant light is received, the light receiving side and the signal generating side of the detection section that received the radiant light will continue to be connected to the common part, so that the radiant light can be Changes can be continuously monitored.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing how a fire detector is installed in a conventional tunnel, Figures 2 to 5 are embodiments of the present invention, and Figure 2 shows how a fire detector is installed in a tunnel. 3 is a circuit diagram for detecting a fire outbreak point based on the operating status of each detection unit, and Figures 4 and 5 are a circuit diagram of a pair of detection units located in the middle excluding the light receiving side and the signal generation side. It is a block diagram having common parts. 11~1n...Fire detector, 20...
Tunnel, 40-4n... Restricted area, 51-5
n, 61-6n...detection section.

Claims (1)

[Claims] 1. A fire detector 11 in which a pair of detection units 51 to 5n and 61 to 6n, each of which has a monitoring distance longer than the length of at least one warning zone 40 to 4n, are provided facing both right and left directions of the tunnel 20. ~1n is attached at the boundary position of each warning area 40~4n, and the detection units 51~5n and 61~6
When n detects fire radiant light, the boundary position and the width where the fire detectors 11 to 1n to which the leftmost one of the detection units 51 to 5n that has detected the radiant light are attached are attached. A signal corresponding to the warning area 40 to 4n between the boundary position where the fire detector 11 to 1n to which the rightmost one of the detection units 61 to 6n that detected the emitted light is attached is output, When either one of the detection units 51 to 5n or 61 to 6n detects the radiant light, it
In the case of 1 to 5n, the detection unit 51 to which detected the above-mentioned beam radiation
Fire detectors 11 to 1 in which the leftmost one of 5n is layered
If the signal corresponding to the guard area 40 to 4n on the left side adjacent to the boundary position where n is attached is 61 to 6n, the rightmost one of the detection units 61 to 6n that detected the radiation light is detected. The fire alarm equipment in the tunnel is configured to output signals corresponding to warning areas 40 to 4n on the right side adjacent to the boundary position where fire detectors 11 to 1n are installed. 2 The leftmost one 51 among the detection units 51 to 5n and the rightmost one 6n among the detection units 61 to 6n are connected to the output terminal 40′ corresponding to the guard area 40 and the guard area 4, respectively.
The other detectors 52 to 5n and 61 to 6n-1 are directly connected to the output terminal 4n' corresponding to n, and the former has one input side connected to the inverter INV_L_1 to INV_L_n-1.
Through the AND circuits AND_L_1 to AND_L_n-1 connected to the left detection units 51 to 5n-1 through the
In addition, in the latter case, one of the input sides is the inverter INV_R_1~
AND circuits AND_R_1 to ANP_R_n connected to the right detection units 62 to 6n through INV_R_n-1
-1, both of them are further OR circuit OR_1~OR_
The fire alarm equipment in a tunnel according to claim 1, which is commonly connected to the output terminals 41' to 4n-1' corresponding to the warning areas 41 to 4n-1 through n_-_1. 3 A pair of detection units 51 to 5n and 61 to 6n are commonly configured in the middle excluding the light receiving side and the signal generating side, and the light receiving side and the signal generating side are synchronously and alternately switched and connected to the common part. A fire alarm system in a tunnel according to claim 1. 4. A patent in which the switching connection is stopped when radiated light is received, and the light receiving side and the signal generating side of the detection units 51 to 5n or 61 to 6n that received the radiated light are continuously connected to a common part. Fire alarm equipment in a tunnel according to claim 3.