JP3457229B2 - Signal transmission system for gas fire extinguishing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-based fire extinguishing facility for extinguishing a fire by releasing a fire extinguishing gas such as carbon dioxide, and an operation box provided in a protective compartment and a control panel for controlling the operation box. The present invention relates to a signal transmission system for gas fire extinguishing equipment for transmitting various signals between the two.

[0002]

2. Description of the Related Art Conventionally, gas-based fire extinguishing equipment has been proposed for extinguishing a fire by releasing a fire extinguishing gas such as carbon dioxide or halon gas when a fire occurs. This gas-based fire extinguishing facility is characterized in that it is possible to quickly extinguish a fire in a room in which equipment that dislikes water loss and pollution is installed, while minimizing equipment loss during fire extinguishing.

FIG. 1 shows an overall configuration diagram of such a gas fire extinguishing facility. In FIG. 1, a plurality of protection sections A and B
A fire detector 1 for detecting a fire, an injection head 2 for injecting a fire extinguishing gas, and a broadcast speaker 3 for performing an emergency broadcast are provided inside each of the above. Further, in the vicinity of the outside of each of the protection sections A and B, there are provided an operation box 4 for manually discharging the fire extinguishing gas and a discharge indicator lamp 5 for displaying the discharge of the fire extinguishing gas. Further, outside the protective compartment, an extinguishing agent storage container 6 for storing extinguishing gas, a selection valve 7 for releasing the extinguishing gas, and this selection valve 7 are provided.
A starting device 8 for driving the control panel, a control panel 9 and the like are provided.

In such a gas fire extinguishing facility, in the automatic mode operation, when an AND alarm is issued from the fire detector 1 connected to the lines of a plurality of systems, a start of countdown for a predetermined time is permitted. The condition (hereinafter, countdown condition) is established, and the countdown is started. When this countdown ends, the conditions for permitting the release of the extinguishing gas (hereinafter, gas release conditions) are established and the extinguishing gas is released. In the manual mode, the observer can detect the fire either visually or by the fire detector 1.
The countdown condition is established by pressing the start switch of the operation box 4. When the countdown ends, the gas release condition is established and the fire extinguishing gas is released.

During operation in each of the above modes, various signals are transmitted from the control panel 9 to each operation box 4 or from each operation box 4 to the control panel 9. FIG. 9 is a connection diagram between a conventional control panel and operation box. In FIG. 9, the control panel 9 has a display for generating and transmitting signals (display control signals) for controlling various display devices (displays) such as indicator lights provided in the operation boxes 4. A transmitter circuit 40 and a receiver circuit for start-up which receives signals (starter control signals) transmitted from various devices (starter controller) such as starter switches provided in the operation box 4 for controlling the start-up of the fire extinguishing equipment. 41 and a ground fault detection circuit 42 for detecting the occurrence of a ground fault in the operation box 4.

A plurality of display control signals transmitted from the display transmission circuit 40 of the control panel 9 are subjected to voltage application in parallel via a plurality of parallel lines 46 according to the control signals, and the display of the operation box 4 is displayed. Is input to control the display. As a start control signal output from the start controller of the operation box 4, a signal due to a voltage change is sent in parallel via a plurality of parallel lines 45, and the control panel 9
The fire extinguishing equipment is activated by the input to the receiving circuit 41 for activation. The activation receiving circuit 41 has a transmission failure of the activation control signal (parallel line 45 and parallel line 4).
A transmission failure detection unit 50 is provided which detects a disconnection and a short circuit in a line from 5 to the ground point G via the terminating resistor R and outputs a transmission failure signal. Further, the ground fault detection circuit 42 detects the ground fault and outputs a ground fault signal when all the lines connected to the operation box 4 have a ground fault.

[0007]

In such a conventional signal transmission system for gas fire extinguishing equipment, the display control signals are simply transmitted in parallel, which causes various problems as described below. It was That is, since the number of parallel lines 46 increases according to the number of display devices provided in the operation box 4, the connection work requires a considerable amount of work. In particular, in recent years, there is a tendency to increase the amount of display information provided on the operation box. For example, when the operation box 4 is provided with a display such as a 7-segment display lamp, connection work is more difficult. Further, when a large number of parallel lines 46 are installed, it is difficult to detect the failure, and there is a problem that the detection mechanism of the display control signal transmission failure becomes complicated.

The present invention has been made in view of the above problems in the signal transmission system for the conventional gas fire extinguishing equipment, and transmits a plurality of signals between the control panel and the operation box with a simple structure. It is an object of the present invention to provide a transmission system for gas-based fire extinguishing equipment that can be used.

[0009]

In order to achieve such an object, the present invention according to claim 1 provides various types of operation between an operation box provided in a protective compartment and a control panel for controlling the operation box. In a signal transmission system for gas fire extinguishing equipment for transmitting a signal, a serial transmission path for transmitting a serial signal is provided between the control panel and the operation box, and the control panel has a plurality of serial transmission lines. A plurality of display control signals for controlling the display device are serially converted and transmitted to the serial transmission line, and the operation box has a plurality of display control signals received through the serial transmission line. Providing a receiving means for converting the signal into parallel and outputting it to each of the display devices,
The control panel is wired to the operation box and the control panel.
Line fault detection means to detect line faults on parallel lines
Provide the operation box with a transmission failure of the display control signal.
Transmission failure detection means to detect and this transmission failure detection means
When a transmission failure is detected by the
It is characterized in that a transmission failure generating means for causing harm is provided .

According to a second aspect of the present invention, in the present invention according to the first aspect, the transmission area of the serial signal is
How to detect the ground fault of each wiring between the control panel and the operation box
It is characterized by being in the region.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is generally
The display control signal is serially transmitted from the control panel to the operation box. 1 is an overall configuration diagram of a gas fire extinguishing facility according to the present embodiment, FIG. 2 is a front view of an operation box, FIG. 3 is a front view of the inside of the operation box, FIG. 4 is a front view of a control panel, and FIG. 5 is an automatic mode operation. 6 is an operation flow at the time of manual mode operation.

First, the configuration and control procedure of the entire gas fire extinguishing facility will be described, and then the configuration and control procedure relating to the signal transmission system will be described. As shown in FIG. 1, a fire detector 1, a jet head 2, and a broadcast speaker 3 are provided inside each of the protective sections A and B. Further, an operation box 4 and a discharge indicator lamp 5 are provided near the outside of the protection sections A and B. Further protective compartment A,
Outside of B, a fire extinguishing agent storage container 6, a selection valve 7, a starting device 8, a control panel 9 and the like are provided.

The fire detector 1 is a fire detecting means for detecting the occurrence of a fire in each of the protection zones A and B and issuing a warning, and a plurality of fire detectors are provided for one protection zone. The plurality of fire detectors 1 are connected to the control panel 9 via receiving circuits of different systems. In order to avoid erroneous release due to an abnormality in the fire detector 1 or the receiving circuit, providing the receiving circuit of the separate system in this way causes the fire detector 1 connected to the receiving circuits of these two systems in the automatic mode. This is because the fire occurrence is judged on the condition that the AND of the reports is obtained.

The injection head 2 is an injection means for injecting a fire extinguishing gas, and is connected to the fire extinguishing agent storage container 6 via a gas pipe line. A selection valve 7 is provided in the gas pipeline, and the extinguishing gas is released by opening the selection valve 7. The activation device 8 activates the selection valve 7 and the open valve of the fire extinguishing agent storage container 6. Further, the broadcast speaker 3 broadcasts a sound notifying that the fire-extinguishing gas is released, and the emission indicator lamp 5 displays that the fire-extinguishing gas has been released.

As shown in FIG. 2, each operation box 4 has a countdown display portion 11 on the front side of its door 10 for displaying the countdown time before extinguishing the extinguishing gas, and an emergency stop for extinguishing the extinguishing gas. A stop button 12, a key switch 13 for selecting the operation mode or the manual mode, a fire lamp 14 indicating a fire, a start lamp 15 indicating that the gas discharge operation is activated, and a power state of the operation box 4 are indicated. A power supply lamp 16, a shut-off valve closing light 31 that flashes when the shut-off valve for releasing extinguishing gas is closed, a manual mode light 17 that lights up during manual mode operation, and an automatic mode light 18 that lights up during automatic mode operation are provided. It is configured. Further, as shown in FIG. 3, the operation box 4 detects the opening of the door 10 and the start switch 19 for manually instructing the release of the fire extinguishing gas inside the door 10 exposed when the door 10 is opened. A door open detection switch 32 is provided.

Hereinafter, the fire lamp 14, the starting lamp 15, the power source lamp 16, the manual mode lamp 17, the automatic mode lamp 18, and the shutoff valve closing lamp 31 will be collectively referred to as an indicator if necessary. Further, the emergency stop button 12, the key switch 13, the start switch 19, and the door open detection switch 32 are collectively referred to as a start controller as necessary.

On the other hand, the control panel 9 has a plurality of protection sections A and B.
Fire monitoring and fire extinguishing conditions in Japan are intensively monitored. Each fire detector 1, each broadcast speaker 3,
It is electrically connected to each emission indicator lamp 5, each operation box 4, and the like. As shown in FIG. 4, the control panel 9 is provided with a plurality of display windows 20 above the front surface thereof to show the status of each of the protection sections A and B. Each display window 20 has a fire lamp 21 indicating a fire, a start circuit abnormality lamp 22 indicating an abnormality in the start circuit, an automatic mode lamp 23 lit during automatic mode operation,
Also, a manual mode lamp 24 that lights up during the manual mode operation is provided.

On the lower part of the front face of the control panel 9, a countdown display section 25 for displaying the countdown time in the protection sections A and B in which the discharge operation of the extinguishing gas is first started, and an alarm speaker for issuing an alarm sound. 26, a key switch 27 for collectively switching the operation mode in all the protection zones to the automatic mode or the manual mode, a start light 28 indicating that the gas discharge operation is activated, a power source indicating the power state of the control panel 9 A lamp 29, a discharge lamp 30 that indicates that gas has been discharged, a failure representative lamp 33 that typically notifies the occurrence of a failure, and the like are provided.

In such a gas fire extinguishing facility, as a basic operation mode for performing the fire extinguishing control, it is possible to switch and select between the automatic mode and the manual mode as in the conventional case. In the automatic mode, as shown in FIG. 5, in the normal monitoring state (step S1), there is an alarm from the fire detector 1 (step S2), and an alarm from the fire detector 1 of another system is issued. If there is (step S
3) The countdown condition is established (hereinafter, the protected section where the countdown condition is established is referred to as a fire section).
When the countdown condition is established, predetermined control is performed (steps S4 and S5), and countdown for a predetermined time is started (step S6). When this countdown is completed (step S7), the gas release condition is established (step S8). Then, a control signal issued from the control panel 9 causes the activation device 8 of the fire compartment to operate and the selection valve 7
Is driven, and gas is released from the ejection head 2 in the fire section (step S9).

In the manual mode, as shown in FIG.
In the normal monitoring state (step S10), the observer discovers a fire visually or by issuing a warning from the fire detector 1, opens the door 10 of the operation box 4 (step S11), and further activates the start switch 19 inside the operation box 4. Press (Step S1
2) The countdown condition is established (step S1)
3). After that, the same processing as the processing after the establishment of the countdown condition in the above-described automatic mode is performed (steps S14 to S18).

Next, the configuration and control procedure relating to the signal transmission system will be described. FIG. 7 is a connection diagram between the control panel and the operation box in the present embodiment, and FIG. 8 is a flowchart of control operation of the display receiving circuit described later. As shown in FIG. 7, the control panel 9 is provided with a display transmission circuit 40, a startup reception circuit 41, and a ground fault detection circuit 42, and the operation box 4 is provided with a display reception circuit 43. ing. The display transmitting circuit 40 of the control panel 9 is connected to the display receiving circuit 4 of the operation box 4 via the pair of serial transmission lines 44.
3 and the display receiving circuit 43 is connected to the display. The activation controller of the operation box 4 is connected to the activation receiving circuit 41 of the control panel 9 via a plurality of parallel lines 45 similar to the conventional one. In this serial transmission, in order to accurately determine a failure such as a disconnection or a short circuit of another transmission line, the transmission is performed with an amplitude in a predetermined range equal to or higher than a predetermined voltage.

In such a structure, the display control signal is transmitted as follows. First, the display transmission circuit 40 of the control panel 9 sequentially generates a display control signal indicating a display state of each display transmitted to the display of each operation box 4, and serially converts the plurality of display control signals. One serial type display control signal is formed, and this display control signal is repeatedly transmitted to the operation box 4 via the serial transmission path 44. The serial-type display control signal is configured by arranging, for example, a synchronization signal, a display control signal indicating a display state of each of a plurality of indicator lights, and an error check signal if necessary according to a predetermined order standard. can do.

On the other hand, in the display receiving circuit 43 of the operation box 4, after the control operation is started by turning on the power (step S1), the synchronization signal included in the display control signal input through the serial transmission path 44. Are constantly monitored (step S2). When the sync signal is input, the subsequent display control signal and the error check signal are read with the sync signal as a reference (step S3). The signal read timing based on the synchronization signal is preset in the display receiving circuit 43.

In the display receiving circuit 43, whether or not there is an error in the read display control signal is confirmed using an error check signal, and the display control signal is converted into a display control signal for each of a plurality of display devices in parallel format. (Step S4). Then, the parallel display control signal is output to the display device, and the display device is controlled based on the display control signal (step S5). As a result, display control such as lighting and blinking of the fire lamp 14 and the starting lamp 15 is performed. Thereafter, the above procedure is repeated until the power is shut off (steps S6 and S7 will be described later). Since the display control signal is serially transmitted in this transmission system, the display control signal can be transmitted via the pair of serial transmission paths 44 regardless of the number of display devices.
Therefore, the work of connecting the transmission line is facilitated.

On the other hand, the transmission of the activation control signal in this transmission system is performed in the same manner as in the conventional case. That is, the plurality of start control signals output from the start controller of the operation box 4 are transmitted by the voltage fluctuations via the plurality of parallel lines 45, and are received by the start receiving circuit 41 of the control panel 9. Then, the activation receiving circuit 41 performs activation control based on the received activation control signal. The activation control signal may be serially transmitted like the display control signal described above. However, in the case of serial transmission, there is a possibility that, when a transmission failure due to noise or the like occurs, the startup control may be erroneously performed or the startup control may not be performed. In order to avoid such a problem, in this embodiment, the activation control signal is wired in parallel as described above to maintain the reliability of the activation control.

Here, the start-up receiving circuit is provided with a line-fault detecting section 50 (line-fault detecting means) for detecting a line fault of the start-up control signal, as in the conventional case. The line fault detection unit 50 constantly or at predetermined intervals monitors the voltage value in each parallel line 45, and when the voltage value exceeds or falls below a predetermined normal range, issues a disconnection or short circuit fault signal. To do. When the disconnection or short circuit failure signal is issued from the line failure detection unit 50, in the control panel 9,
The starting circuit abnormal light 22 of the display window 20 corresponding to the faulty line and the fault representative light 33 are turned on, and the alarm speaker 2
An alarm sound is emitted at 6 and a fault signal is transmitted to an external device. This informs the observer that a failure has occurred.

Further, in the present transmission system, the transmission control signal transmission fault is used to detect and issue a display control signal transmission fault.
For this reason, the display reception circuit 43 of the operation box 4 is provided with a transmission failure detection section 51 (transmission failure detection means) for detecting a transmission failure of the display control signal, and a transmission failure relay 52. A fault relay contact 53 is provided in the line from the parallel signal line 45 to the terminating resistor R.

Then, during the control operation of the display receiving circuit 43 of FIG. 8, the transmission failure detection section 51 of the operation box 4 monitors the transmission interval of the display control signal from the control panel 9 (step S6), and the predetermined time is passed. If it exceeds, it is determined that a transmission failure has occurred. That is, since the display control signal is transmitted from the control panel 9 at a predetermined interval, for example, when the synchronization signal in the display control signal is not detected for a predetermined time, it is determined that there is a transmission failure. This failure determination is difficult in the conventional parallel line having a large number of signals, but can be easily performed in the present system because only the transmission interval of one serial signal needs to be monitored.

When the transmission failure detection section 51 determines that a transmission failure has occurred, the transmission failure detection section 51 controls the transmission failure relay 52 to operate (step S).
7). Then, the transmission failure relay contact 53 is driven by the transmission failure relay 52, and the line from the parallel line 45 to the terminating resistor R is artificially disconnected (that is, the transmission failure relay 52 and the transmission failure relay contact 53 are parallel. A transmission failure generating means for causing a wire disconnection failure is configured). This disconnection is detected by the line fault detection unit 50 of the control panel 9 as described above, the start circuit abnormality lamp 22 and the fault representative lamp 33 are turned on in the control panel 9, and an alarm sound is emitted from the alarm speaker 26. To be Also, it is sent as a transfer signal to an external device. As a result, it is possible to notify the observer that a failure has occurred.

As described above, in the present transmission system, it is difficult to monitor the lines of a plurality of display control signals in the conventional parallel wiring. It is possible to easily detect disconnection and short-circuit failure when the line is disconnected or short-circuits due to contact with another activation control signal line. When the display control signal line is grounded, the ground fault detection circuit can detect the ground fault by monitoring the voltage when the serial signal line is grounded. It is possible to detect a fault, and it is possible to improve the reliability of the display by the display of the operation box 4. Especially parallel line 4
Since the failure of the serial transmission path 44 can be detected by using the failure detection function of No. 5, it is not necessary to provide an individual failure detection mechanism in the serial transmission path 44, and the system configuration becomes simple.

Finally, the transmission system and the ground fault detection circuit 4
The relationship with 2 will be described. The ground fault detection circuit 42 of the control panel 9 shown in FIG. 7 detects the ground faults of all the lines connected to the operation box 4 and outputs a ground fault signal, as in the conventional case. Specifically, the ground fault detection circuit 42 monitors the voltage of the ground fault detection line 54 provided between the operation box 4 and the control panel 9, and this voltage exceeds a predetermined range (ground fault non-detection range). If it is lower or lower, it is judged that a ground fault has occurred and a ground fault signal is issued.

Here, when the voltage of the display control signal is monitored by parallel wiring as in the conventional case, the voltage of the line at the time of monitoring is constant, so the monitoring voltage in the case of a ground fault is near a certain predetermined voltage. Since it can be predicted that the value becomes, the threshold value for determining the ground fault can be determined based on the value, and the ground fault can be reliably detected. However, in this system, the display control signals are serially transmitted as a series. Since the serial transmission transmits a signal by voltage, current, or phase fluctuation, when a ground fault occurs, the voltage fluctuation of the display control signal at the time of the ground fault is large. Therefore, depending on the setting of the threshold value of the ground fault, the failure judgment and the normal judgment are repeated, such as exceeding the threshold value or returning to the original value. Therefore, in this system, the transmission voltage of the serial transmission is transmitted in the voltage range equal to or higher than the predetermined voltage value, and in the region where the width of the region is narrowed as much as possible, and the ground fault is not detected in the range away from the voltage range of the display control signal. The detection range is set to prevent erroneous detection when the voltage of the display control signal is applied to the ground fault detection line. Specifically, the maximum value of the ground fault non-detection range is set to be a low value separated as much as possible from the minimum value of the voltage region of the display control signal.

Although one embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment and may be implemented in various different forms within the scope of the technical idea thereof. Yes, these different forms will be described below. For example, the transmission failure relay contacts are not limited to the positions shown in the figure, but can be arranged at any position that causes a line failure of a parallel signal. Further, it may be arranged on the ground fault detection line to artificially generate a ground fault, and a fault of the serial transmission line may be detected by using the ground fault detection circuit.

[0034]

As described above, according to the present invention described in claim 1, a serial transmission line for transmitting a serial signal is provided between the control panel and the operation box, and the control box is provided in the operation box. A transmitter is provided for converting a plurality of display control signals for controlling a plurality of display devices to a serial transmission path and converting the plurality of display control signals received through the serial transmission path into parallel in the operation box. By providing a receiving means for outputting to each display device, a signal for display control can be transmitted to the operation box through a pair of serial transmission lines regardless of the number of display devices provided in the operation box. Connection work of the transmission line becomes easy. In addition, for the control box and the control box
Line failure to detect line failure of wired parallel lines
A detection means is provided, and the operation box has a transmission failure of display control signals.
Transmission failure detection means for detecting
Line failure of parallel line when transmission failure is detected in
By providing the transmission failure generation means that causes
With regard to the display control signal, which was difficult with conventional parallel transmission
It is possible to detect a transmission failure due to
The reliability of the display can be improved. Especially para
Fault of serial transmission line using fault detection function of real line
Can be detected and an individual failure in the serial transmission line
The need for a detection mechanism is eliminated, and the system configuration is simple.
Become a pull.

Further, according to the present invention as defined in claim 2 , since the transmission area of the serial signal is within the area for detecting the ground fault of each wiring between the control panel and the operation box, the control panel and the operation box are connected. By performing the amplitude of serial transmission in the ground fault detection area that detects the ground fault of multiple wires, if the display control signal has a ground fault, the line fault can be reliably performed without repeating the ground fault and normal judgment. Can be alarmed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a gas fire extinguishing facility according to an embodiment of the present invention.

FIG. 2 is a front view of an operation box.

FIG. 3 is a front view of the inside of an operation box.

FIG. 4 is a front view of a control panel.

FIG. 5 is an operation flow during automatic mode operation.

FIG. 6 is an operation flow during manual mode operation.

FIG. 7 is a connection diagram between the control panel and the operation box according to the embodiment of the present invention.

FIG. 8 is a flowchart of a control operation of the display receiving circuit according to the embodiment of the present invention.

FIG. 9 is a connection diagram between a conventional control panel and an operation box.

[Explanation of symbols]

A, B protection section 1 fire detector 2 jet head 3 broadcast speakers 4 operation box 5 emission indicator light 6 Fire extinguishing agent storage container 7 selection valve 8 starter 9 control panel 10 doors 11,25 Countdown display 12 Emergency stop button 13, 27 key switch 14,21 Fire light 15, 28 Start light 16, 29 Power light 17, 24 Manual mode light 18,23 Automatic mode light 19 Start switch 20 display window 22 Start circuit error light 26 alarm speakers 30 emission lamp 31 Stop valve closed light 32 Door open detection switch 33 Obstacle representative light 40 Transmitting circuit for display 41 Start-up receiver circuit 42 Ground fault detection circuit 43 Display receiving circuit 44 Serial transmission line 45 parallel lines 50 Track failure detector 51 Transmission failure detector 52 Transmission failure relay 53 Fault relay contact 54 Ground fault detection line

Continuation of the front page (56) Reference JP-A-8-276029 (JP, A) JP-A-11-96488 (JP, A) JP-A-8-280838 (JP, A) Actual development Sho-62-42351 (JP , U) Yuji Mihara, Fundamentals of Data Transmission Technology, Transistor Technology SPECIAL, Japan, CQ Publishing Co., Ltd., March 1, 1989, NO. 8, p2-p9 (58) Fields investigated (Int.Cl. ⁷ , DB name) A62C 27/00-39/00 G08B 23/00-31/00 H04Q 9/00

Claims (2)

(57) [Claims] 1. A signal transmission system of a gas fire extinguishing facility for transmitting various signals between an operation box provided in a protected compartment and a control panel for controlling the operation box, wherein the control panel and the operation box are connected to each other. A serial transmission path for transmitting a serial signal is provided between the control panel and the control panel, and a plurality of display control signals for controlling a plurality of display units provided in the operation box are serially converted to serial transmission. transmission means for transmitting the road provided, on the operation box is provided with a receiving means for outputting a plurality of display control signals received via the serial transmission line, said parallel conversion on each display, the control panel Is wired to the operation box and the control panel
Line fault detection means to detect line faults on parallel lines
Provided on the operation box to detect a transmission failure of the display control signal.
Transmission failure detection means and transmission by this transmission failure detection means
When a fault is detected, the line fault of the parallel line is generated.
A signal transmission system for gas fire extinguishing equipment, characterized in that it is provided with transmission failure generation means for causing the same . 2. The transmission area of the serial signal is the control area.
Within the area to detect the ground fault of each wiring between the control panel and the operation box
Signal transmission system of the gas system extinguishing equipment according to claim 1, wherein there.