JP2005266950A - Fire sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate even when earthquake occurs, and a signal line is disconnected, and to surely announce the occurrence of a fire when the fire is detected in this case. <P>SOLUTION: This fire sensor is provided with a power source circuit for fetching a power supply voltage to be impressed from a fire receiver to a signal line, a vibration detection circuit for detecting vibration amounts due to earthquake, and for outputting a vibration amount level corresponding to the detected vibration amounts, a fire detection circuit for detecting physical amounts related with a fire phenomenon, and for outputting a physical amount level corresponding to the detected physical amount and a control circuit for detecting earthquake based on the vibration amount level, and for detecting a fire based on the physical amount level. This fire sensor is provided with an internal power source and a power source switching circuit for switching and connecting either an internal power source or the power source circuit, and for selecting it as a fire sensor power source. The power source switching circuit is connected to the power source circuit in a normal state, and when earthquake is detected by the control circuit, the power source switching circuit is connected to the internal power source. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fire detector provided with a vibration detection circuit that detects vibration caused by an earthquake or the like.

  When an earthquake occurs, the fire detector is equipped with a vibration detection circuit that detects vibrations caused by earthquakes, etc. for the purpose of detecting fire earlier, taking prompt action, and stopping disasters in advance or at a minimum. It is known to increase the detection sensitivity of a fire detector when an earthquake vibration is detected (see, for example, Patent Document 1).

Basically, such a fire detector is connected to a fire receiver through a signal line to constitute a fire alarm facility. The power supply voltage of the fire detector is applied and supplied from the fire receiver through the signal line. When the fire detector detects a fire, it outputs a fire signal on the signal line. The fire receiver can receive and display the fire signal to notify the manager of the building provided with the fire alarm facility of the occurrence of the fire.
Japanese Patent Laid-Open No. 10-188174

  When an earthquake occurs, the signal line may be disconnected due to the vibration, and if it is disconnected, the fire detector will not be supplied with the power supply voltage from the signal line. It was.

  In addition, when the detection sensitivity of the fire detector is increased, it may be possible to detect a fire quickly. However, depending on the adjustment of the detection sensitivity, there is a problem that a fire is erroneously detected due to noise. For example, when a smoke detector is taken as an example of a fire detector, the noise level increases compared to the initial time due to an increase in contamination over time in the dark box of the smoke detector.

  The present invention has been made to solve the above-described problems, and includes a vibration detection circuit for detecting vibration such as an earthquake, and a fire detector to which a power supply voltage is supplied from a fire receiver generates an earthquake signal. The operation is possible even if the wire is disconnected, and in this case, when a fire is detected, it is intended to reliably notify the occurrence of a fire.

  The present invention includes a power supply circuit that takes in a power supply voltage applied to a signal line from a fire receiver, a vibration detection circuit that detects a vibration amount due to an earthquake and the like, and outputs a vibration amount level corresponding to the detected vibration amount, A fire detection circuit that detects a physical quantity related to a fire phenomenon and outputs a physical quantity level corresponding to the detected physical quantity, and a control circuit that detects an earthquake based on the vibration level and detects a fire based on the physical quantity level A fire detector comprising: an internal power source; and a power source switching circuit that selects and connects either the power source circuit or the internal power source as a fire detector power source, the power source switching circuit comprising: Normally, the power supply circuit is connected to the power supply circuit. When the control circuit detects an earthquake, the power supply switching circuit is connected to the internal power supply.

  Further, the control circuit makes the sampling period of the physical quantity level when an earthquake is detected earlier than the sampling period of the physical quantity level when no earthquake is detected.

  In addition, a fire signal output circuit that outputs a fire signal to the signal line, and a wireless transmission circuit that wirelessly transmits the fire signal, the control circuit in a state where the power switching circuit is connected to the internal power supply When the fire is detected, the voltage level of the power supply circuit is sampled, the disconnection of the signal line is detected based on the sampled voltage level, and the disconnection of the signal line is not detected, the fire signal output circuit And a fire signal is output by the wireless transmission circuit when a disconnection of the signal line is detected.

  A wireless transmission circuit that wirelessly transmits a disconnection signal, and wherein the control circuit is connected to the internal power supply and the power supply circuit does not detect a fire for a certain period of time. And the signal line disconnection is detected based on the sampled voltage level. If the signal line disconnection is not detected, the power supply switching circuit is connected to the power supply circuit, and the signal line When disconnection is detected, a disconnection signal is output by the wireless transmission circuit.

  The fire signal or disconnection signal transmitted by the wireless transmission circuit is transmitted to a manager's mobile phone via a wireless communication network.

  The fire detector equipped with this vibration detection circuit is a power supply switching circuit that selects either the power supply circuit that takes in the power supply voltage applied to the signal line from the fire receiver or the internal power supply, and selects it as the fire detector power supply. It has. This power supply switching circuit is normally connected to the power supply circuit. And if the control circuit which detects an earthquake based on the vibration amount level of a vibration detection circuit detects an earthquake, a power supply switching circuit will be connected with an internal power supply. In other words, when an earthquake occurs, the signal line is highly likely to be disconnected, so that the fire detector is prevented from being stopped by operating it with the internal power supply for the time being. Therefore, the fire detector to which the power supply voltage is supplied from the fire receiver can be operated even if an earthquake occurs and the signal line is disconnected.

  In addition, the control circuit detects a fire based on the physical quantity level of the fire detection circuit, but makes the physical quantity level sampling cycle when an earthquake is detected faster than the physical quantity level sampling period when no earthquake is detected. . Therefore, when an earthquake occurs, the detection sensitivity is increased as in the past to eliminate the problem of false detection of fire due to noise, so the detection sensitivity remains unchanged, but faster than usual. A fire can be detected.

  Moreover, the fire detector provided with this vibration detection circuit includes a fire signal output circuit that outputs a fire signal to a signal line, and a wireless transmission circuit that wirelessly transmits the fire signal. The control circuit samples the voltage level of the power supply circuit when a fire is detected with the power supply switching circuit connected to the internal power supply, and detects disconnection of the signal line based on the sampled voltage level. . When the disconnection of the signal line is not detected, a fire signal is output by the fire signal output circuit, and when the disconnection of the signal line is detected, the fire signal is output by the wireless transmission circuit. Therefore, even when an earthquake occurs and the signal line is disconnected, when a fire is detected, the occurrence of the fire can be reliably notified.

  In addition, the fire detector equipped with this vibration detection circuit includes a wireless transmission circuit that wirelessly transmits a disconnection signal. In addition, the control circuit samples the voltage level of the power supply circuit when a fire is not detected for a certain period while the power supply switching circuit is connected to the internal power supply, and the signal line is disconnected based on the sampled voltage level. Is detected. And when the disconnection of the signal line is not detected, the power supply switching circuit is connected to the power supply circuit, so the power supply period from the internal power supply to the fire detector can be minimized, and the life can be extended. . Further, when the disconnection of the signal line is detected, the disconnection signal is output by the wireless transmission circuit, so that it is possible to reliably notify that the signal line has been disconnected due to an earthquake.

  The fire signal or disconnection signal transmitted by the wireless transmission circuit is transmitted to the manager's mobile phone via the wireless communication network. Therefore, even if an earthquake occurs and the signal line is disconnected, it is possible to reliably notify the occurrence of fire or disconnection. Here, for example, due to the occurrence of an earthquake, the manager may not be able to check the display of the fire receiver in various emergency situations such as the occurrence of a fire at another location in the building or the destruction of the building. It is done. However, since the administrator carries the mobile phone to which the fire signal or the failure signal is transmitted, it is possible to reliably notify the occurrence of the fire or the failure.

  FIG. 1 is a partial schematic configuration diagram of a fire alarm facility including a schematic block diagram of a fire detector showing an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the control circuit in the fire detector.

  First, although not shown in detail, a plurality of fire detectors SE are connected in parallel between the common line C and the line L as the signal lines C and L, and the fire detector SE is fired. It is connected to a receiver (not shown) by signal lines C and L to constitute a fire alarm facility.

  The fire detector SE includes a power supply circuit 20 that takes in a power supply voltage applied to signal lines C and L from a fire receiver (not shown), an internal battery 19 that is an example of an internal power supply, and a power supply circuit 20 or an internal circuit. A power source switching circuit 18 that switches and connects one of the power sources 19 to select as a power source of the fire detector SE, and a vibration that detects a vibration amount due to an earthquake or the like and outputs a vibration amount level corresponding to the detected vibration amount The detection circuit 10 includes a fire detection circuit 11 that detects a physical quantity related to a fire phenomenon and outputs a physical quantity level corresponding to the detected physical quantity, and a control circuit 12 that controls the entire fire detector SE. The control circuit 12 detects an earthquake based on the vibration level, detects a fire based on the physical quantity level, and further detects a disconnection of the signal lines C and L based on the voltage level of the power supply circuit 20.

  Furthermore, the fire detector SE takes in the power supply voltage from the acoustic circuit 13 and the power supply circuit 20 that outputs sound corresponding to the fire detection and the disconnection detection of the signal lines C and L, and the vibration detection circuit 10 and the fire detection circuit. 11, a constant voltage circuit 14 that supplies a constant voltage to the control circuit 12 and the acoustic circuit 13, and a wireless transmission circuit 15 that wirelessly transmits a fire signal corresponding to fire detection and a disconnection signal corresponding to detection of disconnection of the signal lines C and L. A switch 15A that is closed only when wireless transmission is performed by the wireless transmission circuit 15, a confirmation lamp circuit 16 that performs display corresponding to fire detection and detection of disconnection of the signal lines C and L, and the signal lines C and L when a fire is detected. And a fire signal output circuit 17 for outputting a fire signal.

  The power supply switching circuit 18 is normally connected to the power supply circuit 20. When the control circuit 12 detects an earthquake, the power supply switching circuit 18 is disconnected from the power supply circuit 20 and connected to the internal battery 19. That is, when an earthquake occurs, the signal lines C and L are highly likely to be disconnected, so that the fire detector SE is operated by the internal battery 19 to prevent the operation from being stopped. For this reason, the fire detector SE to which the power supply voltage is supplied from the fire receiver can operate even when the earthquake occurs and the signal lines C and L are disconnected.

  The control circuit 12 sets the sampling period of the physical quantity level when an earthquake is detected to be earlier than the sampling period of the physical quantity level when no earthquake is detected. For example, the sampling period is 1 second when an earthquake is detected, and 5 seconds when no earthquake is detected. Therefore, when an earthquake occurs, the detection sensitivity is increased as in the past to eliminate the problem of false detection of fire due to noise, so the detection sensitivity remains unchanged, but faster than usual. A fire can be detected.

  The control circuit 12 samples the voltage level of the power supply circuit 20 when a fire is detected in a state where the power supply switching circuit 18 is connected to the internal battery 19, and the signal line C is based on the sampled voltage level. , L is detected, and when the signal lines C, L are not detected, the fire signal output circuit 17 outputs a fire signal, and when the signal lines C, L are detected, the wireless transmission circuit 15 is detected. To output a fire signal. Therefore, even when an earthquake occurs and the signal lines C and L are disconnected, when a fire is detected, the occurrence of the fire can be reliably notified.

  Further, the control circuit 12 samples the voltage level of the power supply circuit 20 when the fire is not detected for a certain period in a state where the power supply switching circuit 18 is connected to the internal battery 19, and based on the sampled voltage level. When the disconnection of the signal lines C and L is detected, and when the disconnection of the signal lines C and L is not detected, the power supply switching circuit 18 is connected to the power supply circuit 20, and when the disconnection of the signal lines C and L is detected, it is wireless. The transmission circuit 15 outputs a disconnection signal. When the disconnection of the signal lines C and L is not detected, the power supply switching circuit 18 is connected to the power supply circuit 20, so that the power supply period from the internal battery 19 to the fire detector SE can be minimized, and its life Can be extended. When the disconnection of the signal lines C and L is detected, the disconnection signal is output by the wireless transmission circuit 15, so that it is possible to reliably notify that the signal lines C and L are disconnected due to the occurrence of an earthquake.

  Here, the wireless transmission circuit 15 wirelessly transmits a fire signal and a disconnection signal, and these signals are transmitted to the server SV via the wireless communication network NW, and the manager SV of the fire alarm facility is transmitted from the server SV. Sent to the mobile phone K as an e-mail. For this reason, the storage unit (not shown) of the control circuit 12 stores the e-mail address of the cellular phone K of the manager M and the text messages corresponding to the fire signal and the failure signal.

  Since the fire signal or disconnection signal transmitted by the wireless transmission circuit 15 is transmitted to the cellular phone K of the manager M via the wireless communication network NW, the signal lines C and L are disconnected due to an earthquake. However, it is possible to reliably notify the occurrence of fire or disconnection. Here, for example, due to the occurrence of an earthquake, the manager M may not be able to check the display of the fire receiver in various emergency situations such as fires in other places in the building or damage to the building. Conceivable. However, since the manager M is carrying the mobile phone K to which the fire signal or failure signal is transmitted, it is possible to reliably notify the occurrence of a fire or failure.

  Next, the operation of the fire detector SE will be described based on the operation of the control circuit 12 with reference to the flowchart of FIG.

  First, the control circuit 12 controls the power supply switching circuit 18 to switch-connect the power supply switching circuit 18 to the power supply circuit 20 (S1). Therefore, the power supply voltage taken in from the signal lines C and L by the power supply circuit 20 is supplied as the power supply for the fire detector SE.

  Next, the control circuit 12 samples the vibration amount level of the vibration detection circuit 10, and determines whether or not an earthquake has been detected based on the vibration amount level (S2). During normal times, that is, when no earthquake is detected (S2), the physical quantity level of the fire detection circuit 11 is sampled at a normal cycle of, for example, 5 seconds (S3), and whether or not a fire is detected based on this physical quantity level. Is determined (S4). If a fire is not detected (S4), the process returns to step S2. If a fire is detected (S4), the fire signal output circuit 17 is controlled to send a fire signal to the signal lines C, Output on L. Further, the confirmation lamp circuit 16 is controlled to light a confirmation lamp (not shown) corresponding to the fire detection, and the acoustic circuit 13 is controlled to continuously sound the sound corresponding to the fire detection ( S5). Note that a fire receiver (not shown) receives and displays a fire signal output on the signal lines C and L, thereby notifying the occurrence of a fire.

  When an earthquake is detected in step S2 (S2), the control circuit 12 controls the power supply switching circuit 18 to switch and connect the power supply switching circuit 18 from the power supply circuit 20 to the internal battery 19 (S6). Therefore, a power supply voltage is supplied from the internal battery 19 as a power source for the fire detector SE.

  Next, the physical quantity level of the fire detection circuit 11 is sampled at a period earlier than the normal period, for example, at an early period of 1 second (S7), and it is determined whether or not a fire is detected based on this physical quantity level (S8). . When a fire is detected (S8), the voltage level of the power supply circuit 20 is sampled, and it is determined whether or not the disconnection of the signal lines C and L is detected based on this voltage level (S9). When there is a voltage, that is, when the signal lines C and L are not disconnected (S9), the fire signal output circuit 17 is controlled so that the fire signal is output from the fire signal output circuit 17 onto the signal lines C and L. . Further, the confirmation lamp circuit 16 is controlled to light a confirmation lamp (not shown) corresponding to the fire detection, and the acoustic circuit 13 is controlled to continuously sound the sound corresponding to the fire detection ( S10).

  When there is no voltage, that is, when the signal lines C and L are disconnected (S9), the control circuit 12 controls the wireless transmission circuit 15 to output a fire signal from the wireless transmission circuit 15. Further, the confirmation lamp circuit 16 is controlled to light a confirmation lamp (not shown) corresponding to the fire detection, and the acoustic circuit 13 is controlled to continuously sound the sound corresponding to the fire detection ( S11).

  Note that the control circuit 12 controls the switch 15A to close only when a fire signal is output from the wireless transmission circuit 15, thereby suppressing wasteful consumption of the power supply voltage of the fire detector SE. When the fire signal is output from the wireless transmission circuit 15, the control circuit 12 sends an e-mail including the e-mail address of the cellular phone K of the manager M and a text message corresponding to the fire signal as the fire signal. The data is transmitted to the server SV via the wireless communication network NW. Then, an e-mail as a fire signal is transmitted from the server SV to the mobile phone K of the manager M of the fire alarm facility.

  If no fire is detected in step S8 (S8), it is determined whether or not a certain period has elapsed since the detection of the earthquake (S12). If a certain period has not elapsed (S12), the process proceeds to step S7. Return. If a predetermined period has elapsed (S12), the voltage level of the power supply circuit 20 is sampled, and it is determined whether or not the disconnection of the signal lines C and L is detected based on this voltage level (S13). If there is a voltage, that is, if the signal lines C and L are not disconnected (S13), the process returns to step S1, and the control circuit 12 controls the power supply switching circuit 18 to turn the power supply switching circuit 18 into the power supply circuit 20. Switching connection is made (S1). Therefore, the power supply voltage taken in from the signal lines C and L by the power supply circuit 20 is supplied as the power supply for the fire detector SE.

  When there is no voltage, that is, when the signal lines C and L are disconnected (S13), the control circuit 12 controls the wireless transmission circuit 15 to output a disconnection signal from the wireless transmission circuit 15. Further, the confirmation lamp circuit 16 is controlled to blink a confirmation lamp (not shown) corresponding to the disconnection detection, and the acoustic circuit 13 is controlled to cause the sound to intermittently sound corresponding to the disconnection detection ( S14).

  Note that the control circuit 12 controls the switch 15A to close only when the disconnection signal is output from the wireless transmission circuit 15, thereby suppressing unnecessary consumption of the power supply voltage of the fire detector SE. When the disconnection signal is output from the wireless transmission circuit 15, the control circuit 12 sends an email including the email address of the administrator's mobile phone K and the text message corresponding to the disconnection signal as the disconnection signal. The data is transmitted to the server SV via the wireless communication network NW. Then, an e-mail as a disconnection signal is transmitted from the server SV to the mobile phone K of the manager M of the fire alarm facility.

  In step S11, the control circuit 12 controls the wireless transmission circuit 15, the confirmation lamp circuit 16, and the acoustic circuit 13 so as to notify the fire detection. However, in step S11, since the control circuit 12 detects both fire and disconnection, the wireless transmission circuit 15, the confirmation lamp circuit 16, and the acoustic circuit 13 are notified so that the detection of these two is performed. May be controlled. For example, the wireless transmission circuit 15 outputs a fire signal and a disconnection signal, the confirmation lamp circuit 16 alternately turns on and blinks a confirmation lamp (not shown), and the acoustic circuit 13 alternately sounds a continuous sound and an intermittent sound. You may control to.

  Further, even during normal times when no earthquake is detected in step S2, the signal lines C and L may be disconnected for some reason. Therefore, the step of monitoring the voltage level of the power supply circuit 20 between step S2 and step S4. When the disconnection of the signal lines C and L is detected, the disconnection signal may be output from the wireless transmission circuit 15 after the power source of the fire detector SE is switched to the internal battery 19.

  In the embodiment, the fire signal or the disconnection signal transmitted by the wireless transmission circuit 15 is transmitted to the mobile phone K of the manager M via the wireless communication network NW, for example, an earthquake occurs. Even when the manager M cannot confirm the display of the fire receiver due to various emergencies caused by this, the manager M can be surely notified of the occurrence of a fire or failure. However, if the manager M can confirm the display of the fire receiver, the fire signal or the disconnection signal transmitted by the wireless transmission circuit 15 is transmitted to the fire receiver, and the fire signal or A wireless reception circuit that receives a disconnection signal may be provided, and a fire display or a disconnection display may be performed by a fire receiver.

  In the above-described embodiment, the signal lines C and L have been disconnected. However, the same applies to the case where the power supply voltage is not supplied to the fire detector SE due to a ground fault of the signal lines C and L.

  In the above-described embodiment, the vibration detection circuit 10 is provided in the fire detector SE. However, a fire alarm facility may be configured by providing a vibration detector that detects an earthquake separately from the fire detector. In other words, the fire detector (without the vibration detection circuit 10) and the vibration detector are connected to the fire receiver via the signal line, and the fire detector (without the vibration detection circuit 10) transmits the earthquake detection signal of the vibration detector. It may be configured to receive.

It is a partial schematic block diagram of fire alarm equipment including a schematic block diagram of a fire detector showing an embodiment of the present invention. It is a flowchart which shows operation | movement of the control circuit in a fire detector.

Explanation of symbols

SE ... Fire detector NW ... Wireless communication network K ... Mobile phone M ... Manager 10 ... Vibration detection circuit 11 ... Fire detection circuit 12 ... Control circuit 15 ... Wireless transmission circuit 17 ... Fire signal output circuit 18 ... Power switch circuit 19 ... Internal battery (internal power supply)
20 ... Power circuit

Claims (5)

A power supply circuit that takes in the power supply voltage applied to the signal line from the fire receiver, a vibration detection circuit that detects the amount of vibration due to an earthquake, etc., and outputs a vibration amount level according to the detected vibration amount, and a physical quantity related to the fire And a fire detection circuit that outputs a physical quantity level corresponding to the detected physical quantity, and a control circuit that detects an earthquake based on the vibration quantity level and detects a fire based on the physical quantity level. In the fire detector
An internal power supply, and a power supply switching circuit for selecting either the power supply circuit or the internal power supply as a fire detector power supply.
The fire detector according to claim 1, wherein the power switching circuit is normally connected to the power circuit, and when the control circuit detects an earthquake, the power switching circuit is connected to the internal power source. 2. The fire detector according to claim 1, wherein the control circuit makes a sampling period of the physical quantity level when an earthquake is detected earlier than a sampling period of the physical quantity level when no earthquake is detected. . A fire signal output circuit that outputs a fire signal to the signal line, and a wireless transmission circuit that wirelessly transmits the fire signal,
The control circuit samples the voltage level of the power supply circuit when a fire is detected with the power supply switching circuit connected to the internal power supply, and the signal line is disconnected based on the sampled voltage level. If the disconnection of the signal line is not detected, a fire signal is output by the fire signal output circuit, and if a disconnection of the signal line is detected, a fire signal is output by the wireless transmission circuit. The fire detector according to claim 1 or 2, characterized in that A wireless transmission circuit that wirelessly transmits a disconnection signal,
The control circuit samples the voltage level of the power supply circuit when a fire is not detected for a certain period in a state where the power supply switching circuit is connected to the internal power supply, and the signal is based on the sampled voltage level. When the disconnection of the signal is detected and the disconnection of the signal line is not detected, the power supply switching circuit is connected to the power supply circuit, and when the disconnection of the signal line is detected, the disconnection signal is output by the wireless transmission circuit The fire detector according to claim 1 or 2, wherein The fire sensor according to claim 3, wherein the fire signal or the disconnection signal transmitted by the wireless transmission circuit is transmitted to a manager's mobile phone via a wireless communication network.

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