JPH0616317B2 - Fire alarm device for storage type receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fire alarm device for a storage-type receiver that performs a fire alarm with a storage time.

[Background Art] A storage-type receiver that issues an alarm when it receives a continuous fire signal from a detector is standardized to cancel the storage function when it receives a fire signal from an emergency call transmitter. It is set. Generally, the transmitter has a contact structure and its signal is the same as that of the thermal cutoff sensor. To distinguish the signal of the transmitter, another wire is connected from the transmitter to the receiver side. Also, by sending a signal, it is distinguished from the signals from other sensors. In the case of P type 2 class receiver and P type 2 class transmitter, there is no separate signal response line, so separate wiring is required, and there are 3 wires between the receiver and transmitter. There was a problem.

FIG. 2 is a block diagram of a conventional receiver A ', in which a sensor connection line 1 and a common line lc are connected to the connection terminals T _L and T _C of the receiver A'. A smoke sensor 1a for detecting smoke is provided between the sensor connection line 1 and the common line lc.
A heat detector 1b for detecting heat, an emergency call transmitter 5 ', etc. are connected. Fire signals from the detectors 1a and 1b are input to the fire receiving circuit 2 and the fire signal detecting circuit 4 via the connection terminal T _L. The fire receiving circuit 2 receiving the fire signal outputs a signal to the alarm generating circuit 3, and the alarm generating circuit 3 receiving this signal issues an alarm. However, in the storage-type receiver A ′, even if the first fire signal is input, the fire receiving circuit 2 does not operate immediately, and if a fire signal is input again after a certain period of time, it is a true fire. Since the determination is made, a storage circuit B having the following circuit configuration is added. That is, a fire signal detection circuit 4 for receiving a fire signal is provided, and the operation sensitivity of the fire signal detection circuit 4 is set higher than the operation sensitivity of the fire reception circuit 2, and the fire signal is detected before the fire reception circuit 2 operates. The detection circuit 4 is made to operate. Therefore, the third
When the detectors 1a and 1b operate as shown in Fig. (A), the fire signal detection circuit 4 immediately operates in response to the signal (Fig. 3).
(c)), the one-shot generating circuit 6 is driven by the output. The fire reception cutoff circuit 7 is driven by the output of the one-shot generation circuit 6 to make the fire reception circuit 2 inoperative, as shown in FIG. 3 (d).

The first timer circuit 8 is driven by the output of the fire signal detection circuit 4 (FIG. 2 (e)) 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 the time delay operation (FIG. 3 (f)). That is, during the time when the first timer circuit 8 is operating, the fire signal detection circuit 4 operates the one-shot generation circuit 6 each time a fire signal is input.
Is activated, and the fire reception cutoff circuit 7 is activated to deactivate the fire reception circuit 2. In other words, while the first timer circuit 8 is counting, even if signals from the detectors 1a and 1b are input, it is considered as a false alarm and the probability of fire notification is increased. Then, since the second timer circuit 9 is activated after the time of the first timer circuit 8 is up, and the one-shot generating circuit 6 is inoperative while the second timer circuit 9 is operating, Since the fire reception cutoff circuit 7 does not work, if a fire signal is input while the second timer circuit 9 is operating, the fire reception circuit 2 responds and drives the alarm generation circuit 3 to issue an alarm. (Fig. 3 (g)).
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 blocking circuit 7, the first timer circuit 8, the second timer circuit 9 and the like constitute the storage circuit B of the receiver A '. It is what

By the way, the transmitter 5'is constituted by a switch-like device whose contacts are short-circuited as described above, and the sensor connection line l
And the common line lc. Further, in order to respond to the fire receiving circuit 2 of the receiver A'by the operation of the transmitter 5'and give an alarm immediately, a means for canceling the above-mentioned storage function is provided. In other words, 'the connecting line l _A from one end of one receiver A' transmitter 5 and the wiring to the terminal T _A of, and connected to a storage release circuit 11 through the transmitter in response circuit 12 from the terminal T _A . When the transmitter 5'is operated, a signal causes the accumulation canceling circuit 11 to operate, and as shown by the broken line in the figure, the fire signal detection circuit 4, the one-shot generation circuit 6, the fire reception interruption circuit 7, the first One of the timer circuits 8 and so on is stopped. Therefore, since the accumulation function is canceled by the signal from the accumulation cancellation circuit 11,
The signal from the transmitter 5'is input to the fire receiving circuit 2 to drive the alarm generating circuit 3 to immediately generate an alarm. As described above, in order to release the storage function of the receiver A ′, it is necessary to separately wire the connection line l _A , and the receiver A ′
The wiring between the transmitter and the transmitter 5'has a total of three wires including the sensor connection line 1 and the common line lc, which deteriorates the workability.

By the way, FIG. 4 is a block diagram obtained by further dividing FIG. 2. As shown in FIG. 4, terminals of the sensor connection line 1 and the common line lc are terminators for detecting disconnection. The terminating resistor R is connected, and the disconnection is detected by detecting the current flowing through the terminating resistor R. That is, the receiver A ′ is provided with the disconnection detection circuit 13 that detects the presence or absence of disconnection by detecting the current flowing through the sensor connection line 1 via the terminating resistor R. As described above, in the receiver A ′ having the storage function, the storage function is provided in the case of the fire signal from the detectors 1a and 1b, and the storage is released in the case of the fire signal from the transmitter 5 ′ to cancel the fire. The method to output the signal immediately is adopted, but in the case of the P-type second class receiver, the wiring is the second
As shown in FIG. 4 and FIG. 4, it is necessary to increase the number of the connection line 1 _A more than that of the non-storage type receiver, and it is difficult to replace the existing receiver with the storage type receiver.

[Object of the Invention] The present invention has been provided in view of the above points, and has two wirings between a receiver and a transmitter to provide a fire signal from the transmitter and a fire signal from a detector. An object of the present invention is to provide a fire alarm device of a storage type receiver that can be discriminated.

DISCLOSURE OF THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block circuit diagram of a main part showing the gist of the present invention. The gist of the present invention will be described, and the description of the same parts as conventional ones will be omitted. That is, the transmitter 5 has a common contact 5c connected to the common line lc, and a normally-closed break contact 5b connected to the sensor connection line 1 via the terminating resistor R,
Make contact 5m directly connected to the sensor connection line l
It consists of and. The signal from the sensor connection line 1 is input to the fire reception circuit 2 and the disconnection detection circuit 13 in the receiver A via the terminal _TL , respectively. Then, the output from the fire receiving circuit 2 and the output from the disconnection detection circuit 13 are input to the accumulation canceling circuit 11, and the accumulation canceling circuit 11 operates only when signals from both circuits 2 and 13 are present at the same time. The alarm function of the storage circuit B is canceled and the alarm is immediately issued from the alarm generation circuit 3. If only one of the fire reception circuit 2 and the disconnection detection circuit 13 outputs, the accumulation canceling circuit 11 does not operate, and the accumulation circuit B issues an alarm with a normal accumulation function.

Now, when the sensor 1a or 1b is activated, a fire signal, that is, a short circuit signal is input to the fire receiving circuit 2. On the other hand, in the disconnection detection circuit 13, since the sensor connection line 1 and the like are not disconnected,
Judge as normal. Therefore, when only the detector 1a or 1b is activated, the signal is input only to the fire reception circuit 2,
Although the signal from the fire receiving circuit 2 is input to the accumulation canceling circuit 11, the accumulation canceling circuit 11 does not operate and the normal accumulation function operates because it is only the signal from the fire receiving circuit 2. . Next, when the sensor connection line 1 or the like is disconnected, the signal is input only to the disconnection detection circuit 13, so that it is not immediately notified. When the transmitter 5 is operated, the contact switches from the break contact 5b to the make contact 5m. At this time, when the break contact 5b is switched to the make contact 5m, the state between the sensor connection line 1 and the common line lc is just the same as the disconnection state, so that state is detected by the disconnection detection circuit 13 and temporarily. Retained.

When the break contact 5b is switched to the make contact 5m, the sensor connection line 1 and the common line lc are short-circuited, and the short-circuit signal is input to the fire reception circuit 2. Therefore, the disconnection signal and the short circuit signal are simultaneously input to the disconnection detection circuit 13 and the fire reception circuit 2, and further, both circuits 2 and 13 are connected.
Signal is input from the storage canceling circuit 11 to the storage circuit B
The accumulation function of will be canceled and an alarm will be issued immediately.
In order to ensure the detection of disconnection, the transmitter 5 should have a longer switching time from the break contact 5b to the make contact 5m.

[Effects of the Invention] As described above, the present invention is a fire that receives a fire signal consisting of a short circuit signal from a sensor that is connected between a sensor connection line and a common line and that detects and responds to smoke and heat. The receiving circuit, the storage circuit that does not output the fire signal even if the fire signal is received again within a predetermined time, and outputs the fire signal when the fire signal is received after the predetermined time, and the signal from the storage circuit gives an alarm. An alarm generation circuit that issues an alarm, a terminator for detecting disconnection connected to the terminals of the sensor connection line and the common line, and a disconnection of the sensor connection line or the common line by detecting the current flowing through the terminator. In a storage-type receiver that has a disconnection detection circuit that detects a fire and that issues a warning when a fire signal is input after the predetermined time has elapsed, a common contact connected to the common line and a sensor via a terminator. With a normally closed break contact connected to the connecting line A disconnection wire that forms a fire alarm transmitter with a normally open make contact directly connected to the sensor connection line, and detects the disconnection state that occurs when the break contact is switched to the make contact by the operation of this transmitter. If there is an output of the detection circuit and an output of the fire reception circuit that detects a short circuit signal that occurs after switching from the break contact of the transmitter to the make contact, the storage function of the above storage circuit is released and the alarm circuit is driven immediately. Since the storage release circuit is formed, when the transmitter is operated, when the break contact of the transmitter is switched to the make contact, a disconnection occurs, which is detected by the disconnection detection circuit. Later, the make contact short-circuits the sensor connection line and the common line, and this short-circuit signal is detected by the fire reception circuit. With the output from the line, the storage release circuit is activated to release the storage function. Therefore, a separate connection line is no longer required as in the past, and only two wires are needed between the receiver and transmitter. The signal of the sensor and the signal of the transmitter can be distinguished, and in this way, an effect that a storage type system can be built without increasing the wiring is achieved. Since only a book is needed, the existing system (non-storage type) can be easily changed to a storage type system.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of essential parts of an embodiment of the present invention, FIG. 2 is a system block diagram of a conventional example, FIG. 3 is an operation explanatory diagram of the same as above, and FIG. 4 is a block circuit diagram of the same as above. Is. 1a and 1b are detectors, 2 is a fire reception circuit, 3 is an alarm generation circuit, 5 is a transmitter, 5c is a common contact, 5b is a break contact,
5 m is a make contact, 11 is an accumulation release circuit, 13 is a disconnection detection circuit, A is a receiver, B is an accumulation circuit, l is a sensor connection line, and lc is a common line.

Claims (1)

[Claims] 1. A connection between a sensor connection line and a common line,
A fire reception circuit that receives a fire signal consisting of a short circuit signal from a detector that detects and responds to smoke and heat, and does not output a fire signal even if the fire signal is received again within a predetermined time, and after the predetermined time A storage circuit that outputs a fire signal when a fire signal is received, an alarm generation circuit that issues an alarm by the signal of the storage circuit, and a terminator for detecting disconnection connected to the terminals of the sensor connection line and the common line. And a disconnection detection circuit for detecting the disconnection of the sensor connection line or the common line by detecting the current flowing through this terminator, and the alarm is issued by the fire signal input after the lapse of the predetermined time. In storage-type receivers, a common contact connected to the common line, a normally closed break contact connected to the sensor connection line via a terminator, and a normally open make contact directly connected to the sensor connection line. Form a fire alarm transmitter with contacts However, a fire that detects the output of the disconnection detection circuit that detects the disconnection state that occurs when switching from the break contact to the make contact by operating this transmitter, and the short-circuit signal that occurs after switching from the break contact of the transmitter to the make contact. A fire alarm device for a storage type receiver, comprising a storage canceling circuit for canceling the storage function of the storage circuit and immediately driving the alarm generating circuit when there is an output from the receiving circuit.