JPH0628585A - Fire detector for tunnel - Google Patents

Abstract

PURPOSE:To save a power loss caused by the conversion of the level of voltage by providing DC output voltage from each DC-DC converter for at least a part of the electrical device of a corresponding terminal device. CONSTITUTION:The DC-DC converter 19 is provided with the high voltage of 48V from a power supply line E and has the well-known constitution of converting the high voltage of 48V into the DC low voltage VL of 10V necessary for making each circuit of a detection terminal device T1 to work. The DC low voltage VL is provided for each part of the detection terminal device T1 to enable the detection terminal device T1 to execute prescribed operation. As the DC-DC converter 19 converts provided high voltage into required DC low voltage VL, conversion loss can be small as compared with the case of using constant voltage power which consumes an excessive voltage as heat in a resistor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detecting device for a tunnel.

[0002]

2. Description of the Related Art A conventional fire detection device for a tunnel used to detect the occurrence of a fire in a tunnel is, for example, a plurality of flame detection devices arranged as terminal devices on a tunnel inner wall at required intervals. And a receiving device for receiving output signals from these flame detectors, and these flame detectors are for supplying power to equipment in the tunnel extending in the tunnel. It is connected to the power supply line, the ground line, the signal line, and the address control line, respectively.

These lines are also connected to the receiving section,
In this way, each flame detector connected to the receiving unit with a cable is supplied with power via a power supply line, and an output signal from each flame detector is sent to the receiving unit via a signal line. Has become. As described above, the power supply to each flame detector is performed through the power supply line and the ground line extending in the tunnel, but the voltage is a DC voltage and a relatively high voltage value ( Since it is usually set to 48V), each flame detector uses a constant voltage device to control this high voltage to 10V.
It is used as a stabilized DC voltage around V. By the way, flame detectors of this kind are usually arranged at intervals of about 25 m. Therefore, for example, in the case of a tunnel having a length of about 2 km, the number of flame detectors is about 80, and the magnitude of the current flowing through the power line is large. That's a lot. For this reason,
The flame detector is designed to consume as little power as possible, thereby reducing the current capacity required for the power supply line and the ground line to reduce the cost.

[0004]

However, in recent years,
In addition to the demand for higher judgment functions in this type of detector, the communication function between each detector and the receiver, and the address assignment of each detector from the receiver Has been demanded, and various configurations have been proposed for coping with this by mounting a microprocessor on each detector or installing various devices on the detector.

As described above, while efforts are being made to reduce the power consumption of the detector, the current consumption of the detector and the current consumption of the devices attached thereto tend to increase, and the power supply line and the ground are connected. To increase the current capacity of the wire, it is necessary to use thicker cables, but the cost for wiring increases and the power loss when the supplied DC voltage is a stabilized DC voltage is large. Therefore, there is a problem that the efficiency of the entire system is significantly reduced.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved tunnel fire detection device which overcomes the above mentioned problems in the prior art.

[0007]

A feature of the present invention for achieving the above object is that a plurality of terminal devices connected to a receiving device by a cable are arranged at intervals along a passage in a tunnel. In a fire detecting device for a tunnel in which required power can be supplied to these terminal devices through a DC power supply line arranged along the passage, power is supplied from the DC power supply line. Accordingly, a DC-DC converter for generating a required DC output voltage lower than the voltage of the DC power supply line is provided corresponding to the terminal device, and each DC-D
The DC output voltage from the C converter is supplied to at least a part of the electric device of the corresponding terminal device.

[0008] The terminal device may be, for example, a plurality of terminal devices for incorporating a flame sensor or connected to the flame sensor for detecting a fire, or any other terminal device provided in any other suitable form. Good. DC
The provision of the DC converter in correspondence with the terminal device includes not only the one-to-one correspondence but also the correspondence in an appropriate ratio. Further, the DC-DC converter may have an appropriate configuration such as one that once converts a DC voltage into an AC voltage and then converts it into a DC voltage of a required level again, or a chopper type converter.

[0009]

The relatively high voltage sent by the power supply line is efficiently converted into the required low voltage by the DC-DC converter, and the output from the DC-DC converter is supplied to the required parts to obtain the voltage level. The power loss that occurs due to the conversion of the is suppressed to a very small value.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a fire detecting device for a tunnel according to the present invention.
Is an appropriate spacing along the side wall of the tunnel (not shown),
For example, it is provided with detection terminal devices T1, T2, ... Tn arranged at intervals of 25 m.

The receiving portion indicated by the reference character Q has a function of sequentially receiving the outputs from the respective detection terminal devices T1 to Tn and processing them for flame detection, and at an appropriate place inside or outside the tunnel. It is provided in. In addition, the receiving unit Q has a DC power supply unit PW for supplying power to various equipment in the tunnel. From the DC power supply unit PW, a power supply line including a power supply line 3 and a ground line 2 is provided. E extends along the passage in the tunnel. In addition to this, the address control line 4 and the signal line 5 are also arranged along the power supply line E from the receiving unit Q, and these are connected via connector pairs C1 to Cn provided corresponding to the respective detection terminal devices. 2 to 5 are connected to the detection terminal devices T1 to Tn as shown. In addition, the DC power supply unit P
W also supplies electric power to the devices in the receiving section Q.

The voltage supplied from the DC power supply unit PW via the power supply line E is, for example, 48 in accordance with the equipment requiring the highest DC voltage among the equipment in the tunnel.
The voltage is as high as V, and this high DC voltage is supplied to the detection terminal devices T1 to Tn. As can be seen from the above description, the power supply line E is connected to the detection terminal devices T1 to Tn and other equipment in the tunnel that requires electric power, for example, equipment for extinguishing fire. The illustration is omitted.

FIG. 2 shows the structure of the detection terminal device T1. The detection terminal device T1 is a right-eye infrared ray receiving element 1
1 and a left eye infrared light receiving element 12. These infrared light receiving elements 11 and 12 are provided on appropriate substrates in different directions so that their light-receiving fields of view are different from each other, and are configured in a known manner so as to obtain a 180-degree monitoring range. .

The right eye infrared light receiving element 11 outputs a right output signal R1 corresponding to the amount of infrared radiation incident on the right eye infrared light receiving element 11, and the left eye infrared light receiving element 12 enters the left eye infrared light receiving element 12. The left output signal L1 corresponding to the infrared radiation amount is output. The right output signal R1 and the left output signal L1 are respectively amplified by the corresponding amplifiers 13 and 14 and converted into digital signals by the analog-digital (A / D) converter 15. The converted digital signals DR1 and DL1 can be sent from the data output unit 16 to the signal line 5 as serial data.

The detection terminal device T1 further comprises an address setting section 17. The address setting section 17 sets unique address data NO1 in the detection terminal device T1, and this address data NO1 is given to the address control section 18. The address control unit 18 is connected to the address control line 4, and receives address data N from the receiving unit Q via the address control line 4.
When O1 is received, the data output unit 16 is controlled so as to send the digital signals DR1 and DL1 from the data output unit 16 to the signal line 5.

The other detection terminal devices T2 to Tn are also
The detection terminal device T1 has the same configuration as that of the above-described detection terminal device T1, and the detection terminal devices T2 to Tn are provided with unique address data NO2 to NOn, respectively.

Therefore, by sending the address data specific to the required detection terminal device from the reception unit Q through the address control line 4, it is possible to exchange data between the reception unit Q and the required detection terminal device. . Therefore, the address data is NO1, NO2, NO3, ...
.. By sequentially changing the control like NOn, the output from the detection terminal devices T1 to Tn is sequentially received by the receiving section Q.
Can be taken into.

Thus, the detection terminal devices T1, T
2, ..., Tn do not have a flame determination function, and the detection terminal device has only a function of sending data obtained from the infrared light receiving element to the receiving unit.

The address setting unit 17 may set a unique number as address data by using a DIP switch, and the address control unit may be composed of a simple counter. At this time, the address control signal generator of the receiver Q sends a pulse signal as an address control signal one pulse at a time, so that the address controller repeats counting and when the address set value of the DIP switch matches, Data can be exchanged between Q and the detection terminal device T1.

As described above, the detection terminal device T1 is
In addition to processing and transmitting the signal from the infrared light receiving element, it also has the function of communicating with the receiving section Q, and therefore the power consumption increases accordingly. In this way, the detection terminal device has various functions,
Even if the power consumption of the detection terminal device increases, the power supply line E can be improved by increasing its functionality and functionality.
In order not to increase the burden on
A DC-DC converter 19 is provided as a power supply device for supplying electric power used by the detection terminal device T1.

The DC-DC converter 19 is supplied with a high voltage of 48 V from the power supply line E, and is a DC-DC converter.
The converter 19 supplies a high voltage of 48V to the 10V necessary for operating the above-mentioned circuits of the detection terminal device 19.
It has a publicly known configuration for converting into the DC low voltage VL.
The direct current low voltage VL is supplied to each part of the detection terminal device T1 so that the detection terminal device T1 can perform a predetermined operation.

The DC-DC converter 19 may be constructed so that the high-voltage DC voltage supplied by the power supply line E is once converted into an AC voltage, and then the required DC low voltage VL is obtained. Alternatively, a chopper type structure may be adopted. In any case, since the configuration itself of the DC-DC converter 19 is publicly known, its detailed description is omitted here.

In this way, the supplied high voltage is applied to the DC-D
When the required low DC voltage VL is converted by using the C converter 19, the conversion loss can be extremely small as compared with the case of using a constant voltage power source that consumes extra voltage as heat in the resistor. As a result, the detection terminal device T1
The current flowing from the power supply line E to the power supply line E is significantly smaller than that when a constant voltage power supply is used, and the current capacity of the power supply line E can be small. Therefore, the cost can be reduced.

That is, when the DC-DC converter 19 is used to set the voltage of 48V to 10V,
If the efficiency is 80%, it becomes (48/10) × 0.8 = 3.84, and the current consumption in the detection terminal device is 1 /
It can be 3.84. Therefore, if the same current capacity as the conventional one is allowed, the current consumption per terminal can be increased up to 3.84 times.

In the above embodiment, the detection terminal device T1
The configuration of the other detection terminal device T
2 ... Tn have exactly the same configuration, the description of the other detection terminal devices will be omitted.

FIG. 3 is a block diagram showing the structure of the receiving section Q. The data reading unit 31 sequentially sends out the address data NO1 to NOn to the address control line 4 at predetermined time intervals, whereby the detection terminal devices T1, T2 ,.
.., data DR1, DL1, D obtained by Tn
.. are sequentially received via the signal line 5, and the received data are sequentially stored in the data storage unit 32. The above-mentioned data collection operation in the data reading unit 31 is repeatedly performed at appropriate time intervals, whereby the detection terminal devices T1, T2, ...
Data indicating the temporal change in the level of each output of Tn is always stored in the data storage unit 32 for a certain period.

The first discriminating section 33, for each of a plurality of sets of data indicating a level change of each output of the detection terminal devices T1 to Tn stored in the data storing section 32, has a flicker state whose level state is peculiar to a flame, That is, it is checked whether or not the level change cycle and the number of changes are in a predetermined state, and thereby the detection terminal device in the level change state corresponding to the flicker state peculiar to the flame is specified. .

Data indicating the result of the discrimination by the first discriminating unit 33 is given to the second discriminating unit 34, and the change of the specific state of the detection terminal device is checked here. That is, the number of detection terminal devices in the output state corresponding to the flicker state peculiar to the flame, the positional relationship between the detection terminal devices, the state of temporal change in the specific state of the detection terminal devices, etc. are checked. Is comprehensively judged to judge whether or not a flame is generated in the tunnel. When the second discriminating unit 34 discriminates that the flame is generated, the flame detecting signal is output from the receiving unit Q.

FIG. 4 shows a block diagram of another embodiment of the present invention. The tunnel fire detection device 40 shown in FIG. 4 is an I / I arranged as a terminal device at appropriate intervals, for example, 50 m intervals, along the side wall of the tunnel.
O controllers U1, U2, ...
The / O controllers U1, U2, ... Are the same as in the case of the tunnel fire detection device 1 shown in FIG. It is connected to the line 5 via the connectors C1, C2 ....

The I / O controller U1 includes detectors KR1 and KR2 including two infrared detecting elements for detecting flames.
, And two detectors KR3 and KR4 are also connected to the I / O controller U2. In this way, the two detectors are also connected to other I / O controllers not shown, and these detectors KR1,
KR2, ... Are arranged at intervals of 25 m along the passage in the tunnel.

Each of the detectors KR1, KR2, ... Corresponds to the right eye infrared light receiving element 11, the left eye infrared light receiving element 12, the amplifiers 13 and 14 and the A / D converter 15 shown in FIG. The output from each detector is input to the corresponding I / O controller.

On the other hand, the I / O controller U1 has a microprocessor 41 as shown in FIG. 5, and the microprocessor 41 is connected to the address control line 4 and the signal line 5 via a communication control section 42. At the same time, it is connected to the detectors R1 and R2 via the input / output interface circuit 43. This I / O controller U1 is a detector K
It is configured not only to control data transmission between R1 and KR2 and a receiver (not shown), but also to execute automatic valve opening / closing control for a fire extinguishing provided in a fire extinguishing system (not shown). The required wiring 44 for this purpose is provided between the circuit 43 and the fire suppression system.

In order to supply necessary power to each part of the I / O controller U1, the detectors R1 and R2 connected to the I / O controller U1 and the fire extinguishing system, the power line 3 is provided in the I / O controller U1. A power supply device 44, which receives a DC voltage, is provided. In the illustrated embodiment, the power supply device 44 has a function of directly outputting the received 48V DC voltage and a low-voltage DC voltage VL lower than the received 48V DC voltage (10V in the illustrated example).
And the function of converting to
A converter 45 is provided. The structure of the DC-DC converter 45 is the same as the structure of the DC-DC converter 19 shown in FIG. 2, and thus the detailed description thereof will be omitted. The 48V high-voltage DC voltage VH and the low-voltage DC voltage VL from the power supply device 44 are appropriately supplied to the required parts. Other I / O controllers U1, U2,
... are similarly configured. The high-voltage DC voltage VH of 48 V, which is appropriately supplied to each of the required parts, is the power line 3
Of course, it may be obtained directly from.

I / provided as a terminal device
Since the O controllers U1, U2, ... Are constructed as described above, the low voltage DC power that must be covered by the I / O controller is obtained from the high voltage DC voltage by the DC-DC converter. The same effect as in the case of the tunnel fire detection device 1 can be obtained.

In each of the above-mentioned two embodiments, the case where the function for communicating with the receiving portion Q is added to the terminal device has been described as an example, but the configuration of the terminal device is not limited to this, and for example, infrared light reception is possible. The configuration may be such that only the element and the circuit for determining the presence or absence of the flicker component in the output are provided, and it has only a completely different function from the function of processing the output of the infrared detection element. The terminal device having the above configuration may be used, and in such a case, the same effect as that of the above-described embodiment can be obtained.

Further, the terminal device and the DC-DC converter do not necessarily have to be housed in one housing. For example, in the example shown in FIG.
12 and the amplifiers 13 and 14 are housed in one housing, and the DC-DC converter 19 is housed in another housing.
A configuration may be adopted in which these casings are attached to the inner wall of the tunnel so that they are adjacent to the corresponding terminal devices, and the required wiring is performed between the two.

Further, in the terminal device, it is not necessary that all the electric power is supplied from the DC-DC converter 19, and a part of the electric power may be covered by the DC-DC converter 19, or 2 A configuration in which the low voltage DC output from one DC-DC converter corresponding to one terminal device is supplied to the corresponding two terminal devices is also an aspect of the configuration of the present invention.

[0039]

According to the present invention, as described above, the low-voltage DC voltage required in various terminal devices can be supplied very efficiently, so that the current flowing through the power supply line can be reduced. , High functionality in terminal equipment without increasing the cost of equipment,
It is possible to obtain a special effect that can deal with the multi-functionalization.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an embodiment of a fire detection device for a tunnel according to the present invention.

FIG. 2 is a detailed block diagram showing the configuration of the detection terminal device shown in FIG.

FIG. 3 is a block diagram showing a configuration of a main part of a receiving unit shown in FIG.

FIG. 4 is a configuration diagram showing the configuration of another embodiment of the fire detection device for a tunnel according to the present invention.

5 is a block diagram showing the configuration of the I / O controller shown in FIG.

[Explanation of symbols]

 1,40 Fire detection device for tunnel 2 Ground wire 3 Power supply line 19,45 DC-DC converter E Power supply line Q Receiver T1, T2, Tn Detection terminal device U1, U2 I / O controller

Claims (1)

[Claims] 1. A plurality of terminal devices, which are connected to a receiving device by a cable, are arranged at intervals along a passage in a tunnel, and via a DC power supply line arranged along the passage. In a tunnel fire detection device capable of supplying required power to these terminal devices, a required DC output voltage lower than the voltage of the DC power supply line by receiving power from the DC power supply line. A DC-DC converter for generating a voltage is provided corresponding to the terminal device, and the DC output voltage from each DC-DC converter is supplied to at least a part of the electric device of the corresponding terminal device. Characteristic fire detection device for tunnels.