JPS62293868A - Fire alarm system utilizing private branch telephone line - Google Patents

Abstract

PURPOSE:To know a place where a fire broke out without providing an address transmitting section in each fire sensor by utilizing fire a private branch telephone line at each part of a building to watch the fire. CONSTITUTION:A telephone line L is normally connected to a sensor signal detecting section 1 by a change-over switch SW, and power source is supplied from a power source section 6 to a telephone set TL and sensors DE1, DE2 through, for instance, the double wound relay of an outgoing signal detecting section 2. When the sensor DE1 detects the smoke of specified temperature and outputs a fire signal, the signal is received by the sensor signal detecting section 1 and an interruption signal is outputted to a processing section 5. The processing section 5 judges which sensor signal detecting section 1 received the fire signal by the input of the interruption signal, and displays the result of judgement, for instance room number or the extension number of telephone in a display section 7 to report the outbreak of fire.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Technical Field] This invention relates to a fire alarm system that utilizes a premises-type talking system.

[Prior art]

Traditionally, fire alarm systems used in buildings with a large area for one fire warning area, or in buildings where one fire warning area is divided into multiple rooms, such as hotels, are unable to tell at which point or in which room a fire has occurred. In order to subdivide and display heat, each fire detector is equipped with a transmitter with a different address.

A fire detector that detects a fire phenomenon such as smoke or Co gas sends out its own address along with fire number 18, and a receiver that receives the fire signal uses the address signal to specify and notify the location or room where the fire occurred. Something like this is used.

[Problems with conventional technology]

However, in such conventional equipment, it is necessary to provide an address signal transmitter in each fire detector and an address signal discriminator in the receiver, which has the disadvantage of being expensive. In addition, when installing fire detectors, changing the floor plan, or adding an extension, fire detectors with different addresses must be installed in the designated locations and rooms, which is a very troublesome task. It is.

Solution to Problem c] In view of the above points, this invention focuses on the fact that many of these buildings are equipped with internal telephone equipment, and each location or room is equipped with an internal telephone line. I did it,
A fire detector is connected to a telephone line, and a detector signal detection unit that detects a fire signal output from the fire detector, a changeover switch that connects the telephone line to an exchange or a detector signal detection unit, and a switch that connects the telephone line to an exchange or a detector signal detection unit; The outgoing signal detection section detects the outgoing signal from the telephone, the incoming signal detection section detects the incoming signal output from the exchange to the telephone line, and the telephone line is normally connected to the sensor signal detection section to detect the outgoing signal. The fire alarm system is characterized by a switch control means that controls a changeover switch to connect to an exchange when a detection section or an incoming signal detection section detects a signal, and uses a private telephone facility.

[For production]

With the above-mentioned characteristic configuration, this fire alarm equipment constantly monitors fires through the telephone line, and when a call is necessary, detects an outgoing or incoming signal and connects the telephone line to an exchange.

〔Example 〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figure 1 is a system diagram of one of the multiple telephone lines, where PBX is an exchange installed in a hotel's telephone exchange room or front desk, TL is a telephone installed in a guest room, etc., and L is a telephone line. It is.

DEI and DE2 are installed on the ceiling of the guest room where the telephone TL is installed, and the telephone port 1;! A heat type, smoke type or gas type fire detector connected in parallel to
When gas etc. is detected, a specific frequency, e.g. 2 K I
Outputs the Iz fire signal to the telephone line.

RE is a fire receiver, and is provided with a sensor signal detection section 1 that detects fire signals of specific frequencies output from the fire detectors DEI and DE2.

On the other hand, in the middle of the telephone line, there is a terminal board M in this embodiment.
Inside the DF, a telephone line is normally connected to the sensor signal detection unit 1 of the receiver RE for fire detection, and when the telephone TL is used for a call, the telephone line is connected. In order to connect to aipBx, a contact of the relay S is provided as a changeover switch SW.

The reception IRE also includes a transmission signal detection unit 2 that detects the current flowing through the telephone line when the handset of the telephone TL is disconnected and the hook switch FS is on, and a replacement aP.
A processing unit that includes an incoming signal detection unit 3 that detects an incoming signal of 1 611 z output from the BX, a line switching drive unit 4 that operates a relay S and switches a changeover switch SW, and a microprocessor CPU, memory, etc. part 5, the telephone TL and the fire detector DE1 when the receiver F2E main body and the telephone line are connected to the detector signal detection part l.
．． A power supply unit 6 that supplies power to the DE 2 is provided. Note that R is a load resistance that replaces the telephone TL when the telephone TL is not connected to the exchange PBX. Further, each signal detection section 1 to 3 and line switching drive section 4 are provided for each telephone line.

Next, the operation will be explained with reference to the flowchart shown in FIG.

The telephone line is normally connected to the sensor signal detection unit 1 by a changeover switch SW as shown in FIG. Power is supplied to the unit 2 via, for example, a multi-winding relay.

In such a state, for example, when the DE 1 detects smoke at a predetermined temperature and outputs a fire signal, the sensor signal detection section 1 receives this signal and outputs an interrupt signal to the processing section 5. . The processing unit 5 receives the interrupt signal (S
l), to determine which sensor signal detection unit l received the fire signal S2), to display the determination result, for example, the room number or telephone extension number on the display unit S3), and to notify the occurrence of a fire. . At this time, in order to prevent false alarms due to malfunction of the fire detector, the power supply to the telephone line is temporarily cut off, the fire detector DEI is restored, and the detector DEI is operated again within a predetermined period of time. A so-called accumulation operation for determining whether to output a fire signal may be repeated multiple times, and a fire alarm may be issued based on the result.

By the way, when there is no fire interrupt signal (Sl) or when the process in S3 is completed, the processing unit 5 determines whether an outgoing interrupt signal is input (S4) or whether an incoming interrupt signal is input manually (S5). ) to determine. This call interruption signal is generated when the call signal detection unit 2 detects that the handset of the telephone TL is removed for a call, the hook switch FS is turned on, and a call current (DC) flows through the telephone line. Output and also
The incoming call interruption signal is output when the incoming signal detection unit 3 detects that the exchange PBX has sent out a 1 6 Hz AC pulse which is the incoming call signal of the telephone TL.

When this outgoing interruption signal or incoming interruption signal is input, the processing unit 5 determines which outgoing signal detection unit 2 or incoming signal detection unit 3 is detecting the outgoing signal or incoming signal (S6) L Based on this determination result, an on signal is output to the line switching drive section 4 of the corresponding telephone line (S7).As a result, the drive section 4 is turned on, the relay S operates, and the changeover switch SW is switched. Telephone line exchanger P
Connects to BX and enables telephone TL to make and receive calls.

On the other hand, 34. If there is no outgoing interrupt signal 2 incoming interrupt signal in S5, the processing unit 5 switches the line switching drive unit 4 of each line.
Outputs an off signal to (S8). As a result, the line switching drive unit 4 set in S7 is reset, and the relay S
is turned off, the selector switch SW is switched, and the telephone line is connected to the sensor signal detection section 1.

In addition, the power supply to the telephone TL and the fire detector DB by the electric AG6 should be carried out between the switching switch and the detector signal detection unit 1 (see Fig. 1) if it is necessary to prevent interference with the exchange PBX. The power supply may be supplied from the DC cut capacitor (between the DC cut capacitor and the DC cut capacitor).

In addition, in the above embodiment, for example, 16
A circuit is installed that outputs a continuous Hz signal as an emergency signal, and when a fire signal is received, this circuit outputs an emergency signal to the corresponding telephone line, and this emergency signal rings the bell of the telephone TL to prevent a fire from occurring. The fire alarm DE may be provided with a voltage-frequency converter that converts an output signal corresponding to the amount of fire phenomenon into a frequency signal and outputs the signal, and the detection signal detector is provided with a frequency discrimination device. If a circuit is provided, changes in the fire phenomenon can be known.

〔effect 〕

According to this invention, fire monitoring is carried out using the telephone lines within the building that are wired throughout the building, so there is no need to provide an address transmitter in each fire alarm system (it is possible to know the location of the fire outbreak). In addition, it is possible to obtain a fire alarm system that is easy to install, is inexpensive, and uses a local telephone line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a fire alarm system using a local telephone line according to the present invention, and FIG. 2 is a flowchart illustrating its operation. TL...telephone, PBX...exchange, L...telephone line, DEL, DE2...fire detector, RE...receiver, SW...changeover switch, 1...sensor signal Detection unit, 2... Outgoing signal detection unit, 3... Incoming signal detection unit, 4... Line switching drive unit, 5... Processing unit.

Claims (1)

[Scope of Claims] A fire detector connected to a telephone line; a detector signal detection unit for detecting a fire signal output from the fire detector; and a detector signal detection unit that connects the telephone line to an exchange or the sensor signal detection unit. a changeover switch for connecting the telephone line; an outgoing signal detection unit that detects an outgoing signal from the telephone flowing to the telephone line; an incoming signal detection unit that detects an incoming signal output from the exchange to the telephone line; A switching control means that is normally connected to the sensor signal detection section and controls the changeover switch so that the switch is connected to the exchange when the outgoing signal detection section or the incoming signal detection section detects a signal. A fire alarm system that uses a telephone line within the premises.