JPH0565918B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a fire receiver that inputs a fire detection signal from a detector and obtains a fire detection display output for each district line. This invention relates to a fire receiver that has a function of detecting wires and displays this information individually for each district line when a disconnection is detected.

[Background technology]

In general, P-type 1st class fire receivers are required to have a device for detecting disconnection of district lines l ₁ , l ₂ , etc. to which detectors G ₁ , G ₂ , etc. are connected. Therefore, in order to make this disconnection detection function more effective, we have changed from manual detection to automatic detection.
Its functionality has been improved to automatic display (representative display), and further to individual automatic detection and individual automatic display.

In this way, fire receivers with individual automatic detection and individual automatic display functions automatically detect disconnected district rotation l ₁ ... and display it for each district line, so disconnected lines can be seen at a glance. This has the effect of greatly simplifying maintenance and inspection, as it is easy to understand and take prompt action.

However, on the other hand, in the case of such a fire receiver, when individually indicating a disconnection line, the district lights L ₁ , L ₂ ... or a part thereof for fire indication are shared, so fire detection and disconnection detection are performed. When these events occurred at the same time, there was a problem that the areas where they occurred could be misjudged. That is, in this type of device, in the case of a fire, the district lights L ₁ and L ₂ in the area where the fire occurred are turned on (continuously), and in the case of a disconnection, the district lights L 1 and L ₂ in the area where the disconnection occurred are turned on. Since L ₂ ... or a part of it is configured to blink, a fire signal may be generated on district lines l ₁ , l ₂ ... that are different from the disconnected district circuits l ₁ , l ₂ ... while the disconnection is displayed. Or, during a fire display, a disconnection occurs in a district line l ₁ , l ₂ ··· different from the fire outbreak district line l ₁ , l ₂ ··· in multiple district lines l ₁ , l ₂ …. If a fire and a disconnection are detected at the same time, one of the different district lights L ₁ , L ₂ . . . will display a fire indication and the other one will indicate a disconnection. Occurrence area lines l ₁ , l ₂ …
There was a problem that there was a risk of errors occurring in determining the

[Purpose of the invention]

The present invention prevents the display of a fire occurrence and the wire breakage from being displayed at the same time by blocking the wire breakage display function when displaying the fire outbreak.
It is an object of the present invention to provide a fire receiver that eliminates the possibility of misidentifying the area where a fire has occurred and allows appropriate measures to be taken quickly in response to a fire outbreak.

[Disclosure of the invention]

The drawing shows a circuit diagram of an embodiment of the present invention, and the fire receiver of this embodiment includes a plurality of district lines l ₁ , l ₂ . . .
Sensors C ₁ and C ₂ and a terminating resistor R ₀ are connected in parallel to the respective district lines l ₁ , l _{2 .} . . , respectively. In addition, in the drawing, the sensors C ₁ , C ₂ ... of each district line l ₁ , l ₂ ...
Although shown as one sensor, each district is actually provided with a plurality of sensors, so these plurality of sensors are connected to each district line l ₁ , l ₂ . . . .
This fire receiver operates with the power from the power supply circuit 1, and applies a predetermined voltage to each district line l ₁ , l ₂ . . . to detect fire and disconnection.
District lights L ₁ , L ₂ ... installed for each district line L ₁ , L ₂ ... indicate fire and disconnection separately for each district line L ₁ , L ₂ .... In addition, in the case of this embodiment, the district lights L ₁ , L ₂ . . .
A light emitting diode is used as the light emitting diode. In this fire receiver, a fire detection circuit is provided for each district line l ₁ , l ₂ , and so on to detect that a fire has been detected by the sensor C ₁ from the voltage state of the district line l ₁ , l ₂ , and so on. The fire detection circuit consists of transistors Tr ₁ , Tr ₂ and resistor R ₃ ~
It is composed of _R7 . In addition, a disconnection detection circuit is provided for each district line l ₁ , l ₂ , which detects disconnection of the district line l ₁ , l ₂ based on the state of voltage applied to the district line l ₁ , l ₂ .
This disconnection detection circuit is connected to comparators com1 and com2.
It is composed of... In addition, this comparator com
The reference voltage of 1, com2, . . . is given in common by resistors R ₁₆ and R ₁₇ . Furthermore, when the output of the fire detection circuit is obtained, the district lights l ₁ , l ₂ . . .
It is equipped with a continuous lighting circuit consisting of a relay Ry ₁ and its contact ry ₁ , which is connected between the terminals and lights the district lights l ₁ , l ₂ . . . continuously. Note that the contact ry ₁ serves as a switch means for connecting the district lights l ₁ , l _{2 .} . . to the power supply circuit 1 in this continuous lighting circuit. When the output of the above disconnection detection circuit is obtained, the district lights l ₁ , l ₂ ...
A flashing circuit that is connected intermittently between the power supply circuit 1 and blinks is installed in the pulse oscillation circuit 2 and the output of the comparator com1 as a disconnection detection circuit for each district line _L1 in the case of district line _L1 . It consists of a transistor Tr ₃ and a resistor R ₈ R. In addition, in the case of district line _l2 , a pulse oscillation circuit 2 and a comparator com2 as a disconnection detection circuit for each district line _l1
Transistor Tr ₆ and resistor provided at the output of
It is composed of R ₁₅ . In other words, in the case of this blinking circuit, the contact ry ₁ is the switching means for connecting the district lights l ₁ , l _{2 .} . . of the continuous lighting circuit between the power supply circuit 1, and the transistor
Tr ₃ , Tr ₆ , ... are used. Furthermore, a pulse oscillation circuit 2 for switching Tr ₃ , Tr ₆ , etc., which is the switching means of the blinking circuit, is connected to each district line l ₁ , l _{2 .}
It is provided in common to...

The operations of the parts related to the above configuration will be individually explained below. Assuming that the sensor C ₁ now operates to detect a fire, both ends of the sensor C ₁ are short-circuited, so a base current flows to the transistor Tr ₂ through the resistor R ₈ and the transistor Tr ₂ is turned on. For this reason, the base current is supplied to the transistor Tr ₁ via the resistor R ₃ and this transistor Tr ₁ is also turned on. Therefore, the district light L ₁ is turned on and the relay Ry ₁ is energized, and the relay Ry ₁ is connected to the contact ry _1. The district light L ₁ maintains its lighting state,
Fire operation will be maintained. Furthermore, sensor C ₂
When a fire detection operation is performed, transistors Tr ₅ and Tr ₄ are turned on by a similar operation, and relay Ry ₂ is self-held, and district light L ₂ is turned on. Next, the disconnection operation will be explained. First, under normal conditions, the reference voltage made up of resistors R ₁₆ and R ₁₇ and the voltage of district lines l ₁ and l ₂ are connected to comparators Com1 and Com2.
The comparison is made using terminating resistors for district lines l ₁ and l ₂ .
If R ₀ exists, that is, if there is no disconnection,
Voltages R ₅ , R ₆ R ₇ and terminating resistance R ₀ of district lines l ₁ and l ₂
This voltage is set to be lower than the reference voltage. Further, the comparators Com1, Com2, . . . are of an open collector type, and when the input on one side is high, the output is short-circuited, and when the input on the + side is high, the output is open.
Therefore, when there is a normal termination resistor _R0 , the negative input is high, so the outputs of comparators Com1 and Com2 are short-circuited, and the pulse oscillation circuit 2 is connected to the resistor.
The signal via R ₁ is thereby shorted and transistor Tr ₃ remains off. In this state, for example, if the district line l ₁ is disconnected, the terminating resistor R ₀ will disappear, so the voltage of the district line l ₁ will rise, the + side of the input voltage of the comparator Com1 will become high, and its output will become open. Become. Therefore, the base current is supplied in pulses from the pulse oscillation circuit 2 to the transistor Tr ₃ through the resistor R ₁ , and the transistor Tr ₃ is repeatedly turned on and off. Therefore, the district light _L1 connected to the transistor _Tr3 via the resistor _R2 blinks to indicate a disconnection. If a fire is detected on the same district line _l1 , the voltage of the district line _l1 will drop because the detector _C1 will be short-circuited.
The above configuration and operation are the basic operations of this type of fire receiver, where only the fire detection operation is performed and the disconnection detection operation is not performed.The following are the features of this embodiment. Let me explain the parts.

In this embodiment, when the output of any fire detection circuit is obtained, the input of the output signal of the pulse oscillation circuit 2 to the blinking circuit of each district line l ₁ and l ₂ is cut off, and all the district lines l ₁ , l ₂ ... is provided with a disconnection display stop circuit that disables the blinking circuit. This disconnection display stop circuit is composed of contacts ry ₁ , ry _{2 .} . . and diodes D ₁ , D ₂ that constitute a continuous lighting circuit for each district line l ₁ , l ₂ .

The operation of the main parts of this embodiment will be explained below. As mentioned above, when a disconnection is detected, another district line _l2 ...
When a fire signal is input to, for example, a fire occurs in the district line _L2 , transistors _Tr5 and _Tr4 are turned on, and the relay _Ry2 is also self-holding, and the contact _Ry2 of the relay _Ry2 is in the ON state. Therefore, the output of the pulse oscillation circuit 2 is short-circuited via the resistor R ₁ and the diode D ₂ , and the base current is not supplied to the transistor Tr ₃ , so the transistor Tr ₃ remains off and the district light is turned off. _L1 does not blink and remains off. In addition, even in this case, the sensor
When C ₁ is activated, transistor Tr ₁ is turned on and district light L ₁ lights up to indicate a fire. Further, if a fire signal is input during the disconnection display operation, the disconnection display is stopped by the same operation as described above, and a fire display is performed based on the newly input fire signal.

〔Effect of the invention〕

As described above, the present invention cuts off the input of the output signal of the pulse oscillation circuit to the blinking circuit of each district line when an output from any fire detection circuit is obtained, thereby disabling the blinking circuit of all district lines. Since the circuit is equipped with a disconnection display stop circuit, when fire detection and disconnection detection occur simultaneously in multiple area lines, only the fire indication is performed, ensuring that the disconnection area is not mistaken for the fire area. It is possible to determine the area where the fire occurred.

[Brief explanation of drawings]

The drawing is a circuit diagram of one embodiment of the present invention, with l ₁ and l ₂
is the district line, C ₁ and C ₂ are the sensors, R ₀ is the terminating resistor,
L ₁ , L ₂ are district lights, Tr ₁ to _{Tr 6} are transistors, R ₃
~R ₁₇ is a resistor, D ₁ and D ₂ are diodes, Ry ₁ and Ry ₂
is a relay, ry ₁ and ry ₂ are contacts, com 1 and com 2 are comparators, 1 is a power supply circuit, and 2 is a pulse oscillation circuit.

Claims (1)

[Claims] 1 Multiple detectors and terminating resistors are connected in parallel to multiple district lines, and a fire is detected by one of the detectors based on the district lights that both indicate fire and disconnection, and the voltage status of the district lines. A disconnection detection circuit detects disconnection of the district line from the state of voltage applied to the district line, and a disconnection detection circuit detects disconnection of the district line from the state of voltage applied to the district line, and when the output of the fire detection circuit is obtained, the district light is connected between the power terminals. It has a continuous lighting circuit that turns on the district lights continuously, and a switch means connected in parallel with a switch means that connects the district lights of this continuous lighting circuit between the power terminals. A flashing circuit that is connected intermittently between the power supply terminals and flashes is provided for each district line, and a pulse oscillation circuit that switches the switching means of the flashing circuit is provided in common, so that the output of one of the fire detection circuits is A fire is characterized in that a disconnection display stop circuit is provided which cuts off the input of the output signal of the pulse oscillation circuit to the blinking circuits of each district line and renders the blinking circuits of all district lines inoperable when a fire occurs. Receiving machine.