JPH053637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a storage type receiver that provides fire alarm.

[Background technology]

Storage-type receivers that issue an alarm when they receive continuous fire signals from a detector are stipulated to cancel the storage function when they receive a fire signal from an emergency call transmitter. Generally, a transmitter has a contact structure, and its signal is the same as that of a thermal sensor.To identify the transmitter's signal, one more wire is connected from the transmitter to the receiver, The sensor also sends a signal to distinguish it from signals from other sensors. By the way, when connecting a P-type 1st class receiver and a P-type 1st class transmitter, there is a separate signal response line, but in the case of a P-type 2nd class receiver and a P-type 2nd class transmitter, there is a separate signal response line. Because there were no wires, separate wiring had to be done, resulting in three wires between the receiver and transmitter, which posed a construction problem.

FIG. 3 shows a block diagram of a conventional receiver A', in which a sensor connection line l and a common line lc are connected to connection terminals T _L and T _C of the receiver A'. Between this sensor connection line l and the common line lc, a smoke detector 1a that detects smoke, a sensor 1b that detects heat,
A transmitter 5' etc. for emergency notification is connected. Fire signals from the detectors 1a and 1b are input to a fire reception circuit 2 and a fire signal detection circuit 4 via connection terminals T _L. The fire reception circuit 2 that receives the fire signal outputs a signal to the alarm generation circuit 3, and the alarm generation circuit 3 that receives this signal issues an alarm. However, in the storage type receiver A', even if the first fire signal is input, the fire reception circuit 2 does not operate immediately, and if a fire signal is input again after a certain period of time, it is determined that there is a real fire. In order to make this determination, the following circuit configuration is added. That is, a fire signal detection circuit 4 that receives a fire signal is provided, and the operating sensitivity of this fire signal detection circuit 4 is set higher than that of the fire receiving circuit 2, and the fire signal is detected before the fire receiving circuit 2 operates. The detection circuit 4 is made to operate. Therefore, when the detectors 1a and 1b operate as shown in FIG. 2a, the fire signal detection circuit 4 receives the signal.
operates immediately (Fig. 2c), and its output is
The one-shot generating circuit 6 is driven. The output of this one-shot generating circuit 6 drives the fire reception cutoff circuit 7 (Fig. 2d), and the fire reception circuit 2
is inoperable. The one-shot generating circuit 6 and the fire reception cutoff circuit 7 constitute an inoperable means.

Also, the output of the fire signal detection circuit 4 is
The timer circuit 8 is driven (FIG. 2e) to count a predetermined time. Then, the second timer circuit 9 is further driven by the time-up signal of the first timer circuit 8 to perform a time-limiting operation (FIG. 2f). In other words, while the first timer circuit 8 is operating, the fire signal detection circuit 4 activates the one-shot generation circuit 6 every time a fire signal is received.
is activated, and further the fire reception cutoff circuit 7 is activated to disable the fire reception circuit 2. In other words, even if signals from the sensors 1a and 1b are received while the first timer circuit 8 is counting, it is regarded as a false alarm, increasing the probability of a fire alarm. Then, after the time-up of the first timer circuit 8, the second timer circuit 9 is activated, and while the second timer circuit 9 is activated, the one-shot generation circuit 6 is deactivated, so that the fire reception is cut off. Since the circuit 7 also does not work, if a fire signal is input while the second timer circuit 9 is operating, the fire receiving circuit 2 responds and drives the alarm generating circuit 3 to issue an alarm (second timer circuit 9 is activated). Figure g). Note that the first and second timer circuits 8 and 9 constitute a timer means. Further, the power supply circuit 10 supplies power to each circuit. In this way, the fire signal detection circuit 4, the one shot generation circuit 6, the fire reception cutoff circuit 7, the first and second timer circuits 8, 9, etc. form the storage function of this receiver A'.

By the way, as mentioned above, the transmitter 5' is constituted by something like a push button that short-circuits the contacts, and is connected between the sensor connection line l and the common line lc. Further, in order to cause the fire reception circuit 2 of the receiver A' to respond to the operation of the transmitter 5' and issue an alarm immediately, a means is taken to cancel the storage function. That is, one connection line _lA is wired from one end of the transmitter 5' to a terminal _TA of the receiver A', and this terminal _TA is connected to the internal storage release circuit 11. Then, when transmitter 5' is operated,
The signal activates the accumulation release circuit 11, which stops any one of the fire signal detection circuit 4, one shot generation circuit 6, fire reception cutoff circuit 7, first timer circuit 8, etc., as shown by the broken line in the figure. . Therefore, since the storage function is canceled, the signal from the transmitter 5' is input to the fire receiving circuit 2, and drives the alarm generation circuit 3 to immediately generate an alarm. In this way, in order to release the storage function of receiver A', it is necessary to wire the connection line _lA separately.
The wiring between receiver A' and transmitter 5' is sensor connection line l.
There were three lines including the common line LC and the common line LC, and there was a problem of poor workability.

[Purpose of the invention]

The present invention has been provided in view of the above-mentioned points, and aims to improve workability by making it possible to release the accumulation function of the receiver without performing separate wiring. This invention provides a storage receiver whose purpose is to enable connection between second-class transmitters using two wires.

[Disclosure of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a block diagram of receiver A, and the circuit forming the storage function is constructed in the same manner as in the prior art. Zener diode in series with transmitter 5
A voltage drop element such as ZD is connected, and this series circuit is connected between the sensor connection line l and the common line lc. Here, when the sensor 1 operates, the sensor connection line l and the common line become almost short-circuited,
As described above, the fire signal detection circuit 4 or the fire reception circuit 2 operates. Then, when the transmitter 5 is operated, the Zener diode
Zener voltage VzD on sensor connection line l by ZD
will occur, so the fire reception circuit 2 is set to operate at this Zener voltage VzD, and the fire signal detection circuit is set so that the fire signal detection circuit 4 does not operate at this Zener voltage VzD. 4 is set. In other words, the operating sensitivity of the fire receiving circuit 2 is set to be greater than the operating sensitivity of the fire signal detecting circuit 4.
At Zener voltage VzD) of ZD, the fire signal detection circuit 4 is not activated, the fire reception circuit 2 is activated, and the alarm generation circuit 3 generates an alarm. Of course, in other detectors (heat, smoke detector) 1, the Zener voltage VzD of the Zener diode ZD is set so that both the fire reception circuit 2 and the fire signal detection circuit 4 operate reliably. Further, the time for the fire signal detection circuit 4 to operate and the fire reception cutoff circuit 7 to operate is set to be earlier than the time for the fire reception circuit 2 to operate.

With this configuration, when a fire signal from the detector 1 enters the receiver A, the storage circuit operates normally as shown in FIG. 2.
Note that the operation in this case is the same as the conventional one, so a description thereof will be omitted. Furthermore, when a fire signal is received from the transmitter 5, the fire signal detection circuit 4 does not operate, the one-shot generation circuit 6 also does not operate, and the fire reception cutoff circuit also does not operate. is input as is to the fire receiving circuit 2, and the receiver A issues an alarm. That is, the storage function is canceled and an alarm is issued immediately after the transmitter 5 is operated.

〔Effect of the invention〕

As described above, the present invention includes a fire reception circuit that is connected between a sensor connection line and a common line and receives a fire signal from a sensor that detects and responds to smoke or heat;
An alarm generation circuit that generates an alarm based on the signal from the fire signal detection circuit; a fire signal detection circuit that responds faster than the fire signal detection circuit when receiving a fire signal from the detector; and a timer means for disabling the above-mentioned disabling means and activating the fire receiving circuit after a predetermined period of time has elapsed based on the output from the fire signal detection circuit. In a storage type receiver that generates an alarm when a fire signal is input after the fire signal has elapsed, the fire signal detection circuit sends an alarm to the emergency call transmitter connected between the sensor connection line and the common line. It is equipped with a voltage drop element that generates a predetermined level of voltage that increases the operating sensitivity of the receiving circuit, so when the transmitter is operated, the voltage between the sensor connection line and the common line is A predetermined voltage is reached by the voltage drop element, and therefore, the fire signal detection circuit that causes the accumulation function of the receiver is made inoperative and the fire reception circuit is activated, thereby canceling the accumulation function and immediately generating an alarm. As a result, there is no need for separate wiring between the transmitter and receiver as in the past, improving workability. The P-type second class transmitter can be connected using two wires, and it can also be used with existing wiring.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a timing chart of the same, and FIG. 3 is a block diagram of a conventional example. 1 is a detector, 2 is a fire receiving circuit, 3 is an alarm generation circuit, 4 is a fire signal detection circuit, 5 is a transmitter, l is a sensor connection line, lc is a common line, and A is a receiver.

Claims (1)

[Claims] 1. A fire reception circuit that is connected between the sensor connection line and the common line and receives fire signals from the detector that detects and responds to smoke or heat, and generates an alarm based on the signal from the fire reception circuit. an alarm generation circuit; a fire signal detection circuit that responds faster than the fire reception circuit when receiving a fire signal from the detector; and a deactivation means that deactivates the fire reception circuit in response to a signal from the fire signal detection circuit. and a timer means for disabling the deactivation means and activating the fire receiving circuit after a predetermined time has elapsed due to the output from the fire signal detection circuit, and generating an alarm when the fire signal is input after the predetermined time has elapsed. In the storage type receiver,
The emergency call transmitter connected between the sensor connection line and the common line is equipped with a voltage drop element that generates a voltage at a predetermined level that makes the fire reception circuit more sensitive than the fire signal detection circuit. A storage type receiver characterized by comprising: