JP2005293234A - P-type fire alarm facility, and its fire detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a P-type fire alarm facility, and its fire detector wherein software controlling operation of detecting whether or not a fire alarm signal has been issued is simple even when there are many fire detectors which are objects of detecting whether or not the fire alarm signal has been issued, and it does not take too much time to detect which fire detector has issued the alarm in regard to all fire detectors. <P>SOLUTION: The fire detector in the P-type fire alarm facility has a fire alarm issuing means for outputting the fire alarm signal by a switching action via a fire detector line, a fire alarm stopping means for stopping the fire alarm, and a fire alarm existence notifying means for notifying whether or not a fire alarm has been issued to a fire receiver at predetermined timing after stopping the fire alarm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a P-type fire alarm system and its fire detector, and more particularly to a fire detector incorporating a microcomputer.

  Conventionally, in a so-called P-type fire alarm facility, a plurality of lines are connected to a fire receiver, and a fire alarm signal receiving circuit that receives a fire alarm signal corresponding to each of the plurality of lines is a fire receiver. When a fire alarm signal is generated on a predetermined line, the fire receiver can recognize which line the fire alarm has occurred (see, for example, Patent Document 1).

In the conventional P-type fire alarm system, the fire receiver can recognize which line the fire alarm signal has occurred in, but which of the multiple fire detectors provided in that line The fire detector cannot recognize whether a fire has been triggered.
Japanese Patent Laid-Open No. 7-200962

  In the above-mentioned conventional P-type fire alarm system, in order to enable the fire receiver to recognize which fire detector of the plurality of fire detectors connected to the line where the fire was reported has fired. In some cases, a unique address is assigned to each of the plurality of fire detectors, and after a fire is reported, the fire receiver polls the fire detector and returns whether there is a fire alert.

  In other words, after the fire receiver receives the fire alarm signal, the fire receiver specifies the address of the first fire detector, sends a command to return the presence of the fire alarm, and receives this command. The first fire detector returns its address and a return signal indicating whether or not the fire has been triggered to the fire receiver.

  Next, the fire receiver designates the address of the second fire detector and sends a command to return the presence or absence of fire alarm. The address and a return signal indicating whether or not the fire has been reported are returned to the fire receiver.

  Similarly, for each of the third and subsequent fire detectors, the address and command are transmitted, and in response, the corresponding fire detector indicates its own address and whether or not it has fired. Return the return signal to the fire receiver.

  In other words, in the P-type fire alarm system, an address and a command are transmitted for each fire detector, and a return signal indicating whether or not the fire has been issued is returned to the fire receiver. When the number of fire detectors that detect whether a fire alarm signal has been generated is large, software that controls the operation to detect whether a fire alarm signal has occurred is complicated. In addition, there is a problem that it takes a long time to detect which fire detector is triggered for all fire detectors.

The present invention detects whether or not a fire alarm signal is generated even if there are a large number of fire detectors that are targets for detecting whether or not a fire alarm signal has been generated in a P-type fire alarm facility. The purpose of the present invention is to provide a P-type fire alarm system in which the software for controlling the operation is simple and it does not take a long time to detect which fire sensor is triggered for all fire detectors, and the fire detector. It is what.

  The present invention provides a fire alarm means for outputting a fire alarm signal by switching operation via a fire detector line, and a fire alarm for stopping the fire alarm after a predetermined time has elapsed since the alarm was fired. Fire detection in a P-type fire alarm facility having stop means and fire alarm presence / absence notification means for notifying the fire receiver at the predetermined timing after stopping the fire alarm. It is a vessel.

In addition, the present invention provides a plurality of fire detector lines, fire alarm means for outputting a fire alarm signal by switching operation via each of the fire detector lines, and a predetermined time has elapsed since the alarm was fired. Later, a fire alarm stop means to stop the fire alarm and a fire alarm presence / absence notification to notify the fire receiver at the predetermined timing after the fire alarm is stopped. P having a plurality of fire detectors, a fire receiver connecting the plurality of fire detectors, a fire signal receiving means, and a polling means for polling the plurality of fire detectors. A type fire alarm system.

According to the present invention, in the P-type fire alarm facility, it is determined whether or not a fire alarm signal has been generated even if there are a large number of fire detectors that are targets for detecting whether or not a fire alarm signal has been generated. There is an effect that the software for controlling the operation to be detected is simple, and there is an effect that it does not take a long time to detect which fire detector has issued for all the fire detectors.

  The best mode for carrying out the invention is the following examples.

[Timing by reference pulse]
FIG. 1 is a diagram showing a P-type fire alarm system PS1 that is Embodiment 1 of the present invention.

  In the P-type fire alarm system PS1, a plurality of fire detectors SE are connected to one fire receiver RE.

  Each fire detector SE is supplied with power from the fire receiver RE, measures physical quantities such as smoke concentration and ambient temperature, and performs fire monitoring.

  FIG. 2 is a block diagram showing the fire receiver RE1 in the P-type fire alarm facility PS1.

  A fire receiver RE1 shown in FIG. 2 is used as the fire receiver RE shown in FIG. 1, and includes a power supply unit 11, a signal transmission circuit 12, a signal reception circuit 13, a fire detection circuit 14, and a disconnection detection circuit. 15, a control circuit 16, a main control unit 17, and a display operation unit 18, a common terminal to which the power and signal lines C and L1 to Ln are connected, and a plurality of line terminals, and a plurality of fires A sensor SE is provided.

  Each line is configured between the power / signal line C and L1 to Ln, and a terminator is disposed at each terminal portion. Of the block configuration in the fire receiver RE1, the signal transmission circuit 12, the signal reception circuit 13, the fire detection circuit 14, the disconnection detection circuit 15, and the control circuit 16 are arranged for each line. Yes.

  FIG. 3 is a block diagram showing the fire detector SE1 in the P-type fire alarm facility PS1.

  The fire detector SE1 shown in FIG. 3 is used as the fire detector SE of FIG. 1 or FIG. 2, and includes a light emitting circuit 31a1, a light receiving circuit 31a2, an amplifier circuit 31b, a transmission transmitting circuit 41, and a transmission receiving circuit. 42, a constant voltage circuit 51, a power supply circuit 52, a charging circuit 53, a clock circuit 61, a microcomputer 71 as a control circuit, a clock oscillation circuit 81, an EEPROM 91 in which addresses and the like are stored, and a diode bridge DB Have

  FIG. 4 is a circuit diagram showing a transmission / transmission circuit 41 provided in the fire detector SE1 shown in FIG.

  The transmission / transmission circuit 41 includes transistors Qy1 and Qy2, a Zener diode Zy, and a recovery detection circuit 50. The recovery detection circuit 50 includes a transistor Qz and a diode Dz.

  When the fire detector SE1 transmits a fire alarm signal, the corresponding port of the microcomputer 71 is maintained at the Hi level. Since this Hi level is supplied to the base of the NPN transistor Qy1, the transistor Qy1 becomes conductive, and the transistor Qy2 becomes conductive through the Zener diode Zy. If the output of the microcomputer port can maintain the Hi level as it is, the power / signal lines C and L of the fire detector SE1 are substantially short-circuited to a low impedance state via the diode bridge DB (the line voltage is, for example, 7V). become). Here, the “Hi level” is a voltage (for example, 24 V) that is equal to or higher than the reference level with respect to the input to the port of the microcomputer 71, and the “Lo level” is a reverse low voltage (for example, 7 V). ). The Hi output and Lo output are the same as the Hi level and Lo level.

  In this state, since the collector of the transistor Qy1 is conductive to the ground GND, the emitter side of the transistor Qz is connected to the ground GND, and the output voltage of the constant voltage circuit 51 is + Vcc via the diode Dz. Since the transistor Qz connected to is also in a conductive state, the anode side of the diode Dz becomes a low potential, and the Lo voltage is sent to the fire signal input to the microcomputer 71. As long as the voltage is supplied from the fire receiver RE in this way, this state continues and the fire output state is maintained.

  FIG. 5 is a circuit diagram of the transmission receiving circuit 42 in the fire detector SE1 shown in FIG.

  Contrary to the conventional example, the transmission / reception circuit 42 has a small current when the voltage between the power / signal lines C and L is higher than the threshold, and the voltage between the power / signal lines C and L is In this case, the current increases when the voltage is lower.

  In the transmission / reception circuit 42, the threshold is determined by the Zener voltage of the Zener diode Zx and the resistance values of the resistors Rx1 and Rx2. The transistor Qx is a MOS-FET, and when the gate-source voltage becomes equal to or higher than a certain voltage (ON voltage), the source-drain is made conductive.

  That is, the voltage value divided by the resistors Rx1 and Rx2 is obtained by subtracting the voltage drop of the diode bridge DB and the Zener voltage of the Zener diode Zx from the voltage applied between the power supply and signal lines C and L of the fire detector SE1. When the + Vcc voltage is lower than the value obtained by subtracting the ON voltage of the transistor Qx and the forward voltage of the diode Dx, and the source-gate voltage of the transistor Qx becomes equal to or higher than the ON voltage, the source-drain of the transistor Qx becomes conductive. Since the + Vcc voltage is applied to the resistor Rx4, the Hi voltage is input to the microcomputer 71.

  Therefore, a state in which the voltage applied between the power supply / signal lines C and L is high (that is, a normal monitoring state) surely turns off the transistor Qx. The transistor Qx, the Zener diode Zx, and the resistors Rx1 and Rx2 may be selected so that the transistor Qx is in a conductive state at a voltage that is less than or equal to the voltage to be set.

  Although a Pch MOS-FET is used as the transistor Qx, a PNP transistor may be used.

  According to the above embodiment, when the input voltage of the voltage detection circuit of the transmission / reception circuit is high, the current consumption of the determination circuit is low, and when the input voltage is low, the current consumption of the determination circuit increases. The current consumption of the fire detector SE1 is small.

  FIG. 6 is a circuit diagram showing a specific example of the confirmation lamp circuit 80 in the fire detector SE1 shown in FIG.

  The confirmation lamp circuit 80 is an emitter follower circuit. In a conventional fire detector, there is an example in which an emitter follower circuit is used as a confirmation lamp circuit. The voltage applied to the fire detector is nominally 24V, but actually varies from 17-30V. In order to obtain a constant brightness with respect to a varying voltage, an emitter follower circuit capable of obtaining a constant current is advantageous.

  The confirmation lamp circuit 80 shown in FIG. 6 has a point that a base resistor R1 that is originally unnecessary in the emitter follower circuit is inserted, and a point that guides a signal between the base resistor R1 and the base to the voltage discriminating means. There is a feature.

  As a result, in the unlikely event that the confirmation lamp LA runs out of bulb, no current is supplied to the collector, so the base current increases and the voltage drop due to the base resistance R1 increases. Therefore, if the voltage determination means determines the voltage at the connection point between the resistor R1 and the base, it is possible to find out that the confirmation lamp LA has run out.

  In the P-type fire alarm system PS1, as a result of fire monitoring, when the physical quantity increases to a level that requires an alarm, the fire detector SE connects its own power line (transmission line) to the fire receiver RE. By a short-circuiting method, so-called switching operation, the line current is increased and a fire is notified.

  Further, if it is not a fire, it judges by itself whether or not the automatic inspection result is appropriate, and sends the judgment result in response to an inquiry from the fire receiver RE.

  Next, the operation of the first embodiment will be described.

  FIG. 7 is a diagram illustrating an example of polling transmission in the first embodiment.

  In FIG. 7, “parent” is the fire receiver RE in FIG. 1, and “child” is the fire detector SE.

  FIG. 7 (1) shows a signal output from the fire receiver RE, and FIG. 7 (2) shows a signal output from the fire detector SE.

  In the case of polling transmission in the above embodiment, the fire receiver RE is assigned with individual addresses to a plurality of fire detectors SE provided for each line, and the fire detectors SE are grouped based on the addresses, and 15 address units. (For each address 1 to 15), the data of the fire detector SE is collected, and the start pulse, the reference pulse, and the fire polling 1 are sent out based on the fire alarm signal of the fire detector SE.

  The fire alarm signal is a signal output from a fire detector that detects a fire, and is, for example, a Lo pulse with a width of 1.645 S ± 35 ms. Then, after this fire alarm signal, the fire detector turns off the fire alarm, and outputs an OFF signal (for example, 24V signal) of 1 ms or more, for example. That is, as shown in FIG. 7 (2), the fire detector SE stops the fire alarm after a predetermined time has elapsed since the fire alarm.

  The start pulse receives the fire alarm signal of the fire detector SE and the subsequent fire alarm stop signal, detects a predetermined timing of the fire alarm stop, and after that, the microcomputer 71 of the fire detector SE is turned on. The fire receiver RE transmits a Lo pulse with a pulse width of 2 ms and a Hi pulse with a pulse width of 18 ms. The fire detector SE returns the microcomputer 71 from the sleep mode and prepares for reception of the reference pulse. Note that the microcomputer 71 enters the sleep mode after a necessary operation such as a fire detection operation, and requires a stable time after starting from this state.

    The reference pulse is a reference pulse that is a basic length of a transmission pulse interval, and is 4 ms at a falling edge interval (H → L to H → L).

    FIG. 8 is an explanatory diagram of the first embodiment.

    The fire polling 1 is a control command to the fire detector SE, and indicates an 8-bit code at four pulse intervals. For each pulse interval, as shown in FIG. Replace with

  As shown in FIG. 8, a 2-bit code is indicated by a falling edge interval (tb).

  FIG. 9 is an explanatory diagram of the first embodiment.

  For example, the control command fire polling 1 shown in FIG. 9 is 10110101b = B5h. The code content of the control command fire polling 1 is as shown in FIG. In other words, 5 bits from b7 to b3, here, a line is designated by 10110b, 2 bits from b2 and b1, here, 10 is used to instruct a control command and selecting of the fire detector SE, and an odd parity of b0 Is added. The fire detector SE makes no response when it detects a parity error.

  Then, when waiting for transmission shown in FIG. 7, the fire detector SE analyzes the control command fire polling 1 and the like.

  FIG. 10 is an explanatory diagram of the first embodiment.

  Slots 0 to 14 (slots corresponding to addresses 1 to 15 respectively) determine the timing of transmission from the fire detector SE to the fire receiver RE, and are slot positions based on polling 1 or 2 and their own addresses. Then, as shown in FIG.

  The fire sensor SE transmits the pulse shown in FIG. 10 to the specified slot.

  The pulse from the fire detector SE is output by the microcomputer 71 via the transmission / transmission circuit 41 shown in FIG. 3, and the code from the fire detector SE is expressed by changing the pulse width. In the example shown, a result when a signal indicating whether or not there is a fire alarm signal in each fire detector SE (a signal indicating whether or not the fire alarm signal has been output) is returned. That is, if the fire detector has not fired (fire detector normal), a pulse with a pulse width of 2 ms is returned, while if the fire detector has fired, the pulse width Send back one 4ms pulse.

  Therefore, as shown in FIG. 7B, the fire detector SE has fired to the fire receiver at a predetermined timing (slot position based on its own address) after stopping the fire reporting. Notify

  The fire polling 2 is an 8-bit control code similar to the fire polling 1, and the code transmission / reception method is the same as the fire polling 1. The contents of control are indicated by the contents of these fire polling 1 and fire polling 2.

  Using such signal transmission, the fire receiver RE is connected between the power and signal lines C, L1 to Ln by including the control content of fire polling 1 or fire polling 2 in the control command and transmitting it. The fire receiver RE collects information indicating the presence / absence of a fire alarm signal from each fire detector SE.

  In the first embodiment, as shown in FIG. 2, since the signal transmission circuit 12 and the signal reception circuit 13 are provided for each of the power / signal lines C and L1 to Ln, for each line, A signal is exchanged with the fire detector SE, and therefore the line designation portion in the control command fire polling 1 may be ignored. And there are up to 30 fire detectors SE connected and addressed to one line.

  In this way, the P-type fire alarm system PS1 detects the fire signal from each fire detector SE by the fire detector RE for each line by the fire detector RE, and the signal transmission circuit 12 and the signal reception circuit. 13, the fire receiver RE can recognize which fire detector has output the fire alarm signal.

  If the fire detector SE erroneously detects fire polling from the fire receiver RE, no response is made in the slot corresponding to its own fire detector. If fire polling is an error (for example, when there is a response from an address that does not exist or an address with no response error), fire polling is retried once. Furthermore, if fire polling is not received again within a predetermined time (for example, 340 to 270 ms) from fire polling 2 (polling for slot 14), it is determined that “fire polling is established”. The same is true after retrying. When a predetermined time (for example, 340 to 270 ms) elapses after the fire polling is established or the fire pulse is transmitted, the confirmation lamp is turned on and the line is held at the Lo level until the fire receiver RE is restored. When the fire detector SE receives the recovery from the fire receiver RE, the fire detector SE returns to the normal monitoring state.

  Here, the transmission format (that is, the start pulse, the reference pulse, the fire polling, the transmission standby, and the slot) used for the fire polling transmission shown in FIG. The format of the fire detector disclosed in the 109136 publication is the same format except that the commands for the failure detection format and the detection format are changed.

  That is, in the first embodiment, since the fire alarm detection format and the failure detection format are shared, the software of the transmission part can be shared, and the software processing can be simplified. Also, from the viewpoint of the fire detector, it is possible to distinguish between fire transmission and failure transmission according to the difference in command, so it is possible to collect a plurality of information (fire alarms / failures) in a single transmission.

  In other words, the fire detector SE outputs a fire alarm signal by switching operation via the fire detector line, and stops the fire alarm after a predetermined time has elapsed since the fire alarm was issued. P-type fire alarm having a fire alarm stop means for performing and a fire alarm presence / absence notification means for notifying the fire receiver at the predetermined timing after the fire alarm is stopped. It is an example of the fire detector in an installation.

  In this case, the fire notification presence / absence notification means is a means for discriminating the presence or absence of the fire notification by changing the pulse width.

  The fire alarm system PS1 includes a plurality of fire detector lines, a fire alarm means for outputting a fire alarm signal by switching operation via each of the fire detector lines, and a predetermined time after the fire alarm is issued. After the elapse of time, the fire alarm stop means for stopping the fire alarm and the fire alarm for notifying the fire receiver at the predetermined timing after stopping the fire alarm. A fire receiver comprising a plurality of fire detectors having presence / absence notification means; a fire signal receiving means connected to the plurality of fire detector lines; and a polling means for polling the plurality of fire detectors; It is an example of a P-type fire alarm facility having

  In this case, the fire alarm system PS1 has a fire alarm stop timing detecting means for detecting the timing at which the fire detector stops the fire alarm, and the polling means has a predetermined timing after the fire alarm stop timing. This is a means for polling by sending a command to the fire detector.

  Further, the polling means is a means for polling the plurality of fire detectors in a format for outputting a predetermined pulse every predetermined time. The fire sensor is a fire sensor that recognizes that its own fire sensor is polled when it receives a predetermined number of pulses of the plurality of predetermined pulses in the format.

  According to the above embodiment, in the P-type fire alarm facility, even if there are a large number of fire detectors that are targets for detecting whether or not a fire alarm signal has been generated, the fire alarm signal can be generated by one command. Since it detects whether it generate | occur | produced, the software which controls the operation | movement which detects whether the fire alarm signal was generated is simple.

In addition, according to the above embodiment, in the P-type fire alarm system, even if there are a large number of fire detectors that are targets for detecting whether or not a fire alarm signal has been generated, It does not take a long time to detect whether the sensor has reported.

It is a figure which shows P type fire alerting | reporting installation PS1 which is Example 1 of this invention. It is a block diagram which shows the structure of the fire receiver RE1 in the said Example. It is a block diagram which shows the structure of the fire detector SE1 in the said Example. FIG. 4 is a circuit diagram showing a transmission / transmission circuit 41 in FIG. 3. FIG. 4 is a circuit diagram showing a transmission / reception circuit 42 of FIG. 3. It is a circuit diagram which shows the confirmation lamp circuit 80 of FIG. It is a figure which shows the example of the polling transmission in the said Example. It is explanatory drawing of the said Example. It is explanatory drawing of the said Example. It is explanatory drawing of the said Example.

Explanation of symbols

RE, RE1 ... Fire receiver,
SE, SE1 ... Fire detector,
PS1 ... P type fire alarm equipment,
12 ... Signal transmission circuit,
13: Signal receiving circuit,
14 ... Fire detection circuit,
15 ... Disconnection detection circuit,
41 ... Transmission circuit,
42 ... receiving circuit,
71: Microcomputer,
81: Clock oscillation circuit.

Claims (6)

Fire alarm means for outputting a fire alarm signal by switching operation via a fire detector line;
Fire alarm stop means for stopping the fire alarm after a predetermined time has elapsed since the fire alarm;
Fire notification presence / absence notification means for notifying the fire receiver whether or not a fire has been triggered at a predetermined timing after the fire reporting is stopped;
A fire detector in a P-type fire alarm facility characterized by comprising: In claim 1,
The fire detector in the P-type fire alarm facility, wherein the fire notification presence / absence notification means is means for distinguishing the presence / absence of a fire alarm by changing a pulse width. With multiple fire detector lines;
Fire alarm means for outputting a fire alarm signal by switching operation via each fire detector line, and fire alarm stop means for stopping the fire alarm after a predetermined time has elapsed since the alarm was fired. And a plurality of fire detectors comprising a fire report presence / absence notification means for notifying the fire receiver at a predetermined timing after stopping the fire report;
A fire receiver comprising: a plurality of fire detectors connected; a fire signal receiving means; and a polling means for polling the plurality of fire detectors;
A P-type fire alarm facility characterized by comprising: In claim 3,
Having a fire alarm stop timing detection means for detecting the timing when the fire detector stops the fire alarm;
The P-type fire alarm system characterized in that the polling means is a means for polling by transmitting a predetermined command to the fire detector after the fire alarm stop timing. In claim 3,
The P-type fire alarm system, wherein the polling means is means for polling the plurality of fire detectors in a format for outputting a predetermined pulse every predetermined time. In claim 5,
The fire detector is a fire detector that recognizes that its own fire detector is polled when it receives a predetermined number of pulses of the plurality of predetermined pulses in the format. Notification equipment.

Images