JPS61170893A - Storage type receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a storage type receiver for fire alarm.

[Background Art] Conventionally, in this type of storage type receiver, when a fire signal is output from a fire detector, it does not immediately determine that there is a fire, but instead uses a fire reception method that receives the fire signal from the fire detector. If the fire signal reception operation of the circuit is temporarily stopped, and the fire signal is output again from the fire detector after a predetermined period of time, it is determined that there is a fire.The so-called accumulation operation prevents the fire reception circuit from malfunctioning due to noise, etc. I was trying to prevent it. A circuit that performs the above operation is shown in FIG. 2, and its configuration is as follows. A fire detector 1 that detects and responds to smoke or heat, a fire receiver path 4 that receives a fire signal from the fire detector 1, a power supply circuit 2 that supplies power to the fire receiver circuit 4; fire detector 1
A fire signal detection circuit 5 that detects a fire signal from the fire signal earlier than the fire reception circuit 4, and two contacts so that the output of the fire signal detection circuit 5 disables the fire signal reception operation of the fire reception circuit 4 for a certain period of time. Contact r1 of the first relay Re, having
and a disabling means for switching the power supply circuit 2 to stop the power supply to the fire reception circuit 4. Here, the inoperable means consisted of a timer circuit 6.7, a one-shot generating circuit 8, and a fire reception cutoff circuit 3. The circuit having the above configuration will be detailed as follows. A fire reception cutoff circuit 3 is connected to the power supply circuit 2, and the fire reception cutoff circuit 3 is composed of a cutoff relay Re+ and a transistor Q1 as a switching element.

A series circuit of transistors Q and Q is connected to both ends of the power supply circuit 2, and a contact r having terminals a and bjl of the relay Re+ is inserted in series with the power supply circuit 2. The fire detector 1 is connected to the terminal a via the fire receiving circuit 4, leaving the terminal a vacant terminal. Further, a fire signal detection circuit 5 is connected to the fire detector 1 for detecting fire signals from the fire detector 1, and the output of the fire signal detection circuit 5 is used to determine the non-operation time of the fire reception circuit 4. The first timer circuit 6 is connected to a one-shot generation circuit 8 that drives the first timer circuit 6 and the transistor Q, and the first timer circuit 6 connects a second timer circuit 7 that determines the time at which the fire reception circuit 4 receives the fire signal. The one-shot generating circuit 8 is connected to the one-shot generating circuit 8 via the one-shot generating circuit 8.

The operation of this circuit configured as described above is as follows.

First, in a normal state, the contact r of the relay Re is switched to the terminal a side, and power is supplied to the fire receiving circuit 4 via the fire receiving circuit 4. Here, when a fire is detected by the fire detector 1 and a fire signal is output as shown in FIG. 3(a), the fire signal is detected by the fire signal detection circuit 5, and the fire signal detection circuit 5 Outputs a trigger pulse to the one-shot generating circuit 8. The one-shot generating circuit 8 is triggered by this trigger pulse and outputs a high-level pulse output to the base of the transistor Q1. Then, transistor Q1 turns on and relay Re+
A current flows through the terminal, and the terminal switch is switched to the terminal side, and the power supply to the fire receiving circuit 4 is temporarily stopped, and the fire signal receiving operation of the fire receiving circuit 4 is stopped. Here, since the above-mentioned operation is performed before the fire receiving circuit 4 detects the output of the fire detector 1, the fire alarm driven by the fire receiving circuit 4 does not issue a fire alarm. At the same time, the fire signal detection circuit 5 operates the first timer circuit 6 as shown in FIG. 3(b). Even if a fire signal is output from the fire detector 1 as shown in FIG. 3(n) during the timed operation of the timer circuit 6, the fire signal reception operation of the fire receiving circuit 4 is performed in the same manner as described above. By stopping, no fire alarm will be issued. Furthermore, the reason why the fire signal is pulsed as shown in Figure 3(a) is because when the power supply to the fire receiving circuit 4 is stopped, the power supply to the fire detector 1 is also stopped. If the device is self-maintained by a thyristor, such as a smoke detector, the power supply must be temporarily stopped (this is because malfunction of the smoke detector cannot be detected.Then, the timed operation of the timer circuit 6 ends. Then, the second timer circuit 7 starts a timed operation as shown in FIG. 3(e), and during the timed operation of the second timer circuit 7, the fire signal from the fire detector 1 is detected. Even if the circuit 5 detects the fire, the one-shot generating circuit 8 is controlled by the timer circuit 7 so that it does not receive the fire detection circuit 5 output signal. Therefore, since the contact r1 of the relay Re+ continues to supply power to the fire receiving circuit 4, the fire receiving circuit 4 receives the fire signal from the fire detector 1 and activates the fire alarm. Drive the third
A fire alarm is issued as shown in Figure (e).

However, in the circuit described above, if a failure occurs in which transistor Q1 continues to be on, or contact r1 of relay Re is caught on the terminal side, and relay Re becomes unable to switch contacts, fire detection circuit 4 No power is supplied at all, making it impossible to detect a fire.Especially, if the above operation is performed all at once in the above circuit (including one relay), which performs one accumulation operation on all lines, the operation frequency will increase, The switching operation of relay Re, contact r, is likely to fail with ν1 and ~
There was one problem.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to detect a failure in the contact switching operation of a relay and prevent a situation in which fire cannot be detected. The object of the present invention is to provide a storage type receiver.

[Disclosure of the Invention] (Embodiment) FIG. 1 shows an embodiment of the present invention, in which an abnormality detection circuit 10 as an abnormality detection means and a bypass relay Re2 are provided in a circuit similar to the conventional example. It is something that This abnormality detection circuit 10 includes a transistor Q2 and resistors R1 to R1.
, and a capacitor C1, a series circuit of a relay Re2 and a transistor Q2 is connected to the power supply circuit 2, and a resistor R2 and a capacitor are connected from the terminal of the contact r of the relay Rel of the fire reception cutoff circuit 3 through the resistor R1. The connection point between resistor R1 and resistor R2 is connected to the base of transistor Q2, and the contact r2 of relay Re2 connects the common terminal of contact r1 of relay Re and terminal a. Connected like this. Here, resistors R1, R2 and capacitor C8 constitute a time constant circuit. A light emitting diode LD is connected to the relay Re2.

The operation of this embodiment having the above-described configuration is as follows.

First, in the same operation as the conventional example, the fire signal detection circuit 5 detects a fire signal emitted from the fire detector 1, and the one-shot generation circuit 8 outputs a trigger pulse to the transistor Q1, which turns on the transistor Q1. Assume that this causes the relay Re to operate and the contact rl to switch to the terminal side. During the switching operation of contact r1 at this time, transistor Q1
If relay Re continues to be on and malfunctions, or if contact r1 of relay Rel gets caught on the terminal side, and the contact switching operation of relay Re becomes impossible, power will not be supplied to fire receiving circuit 4, and a fire will occur. Detection operation becomes impossible. Then, the power supply is connected to the resistor R1 from the terminal.
The signal is supplied to the entire transistor Q2 through the transistor Q2. However, transistor Q2 + resistor R2 and capacitor CI
Since the base potential of the transistor Q2 does not exceed the threshold value immediately, the resistors R5 and R2
, the transistor Q2 is not turned on for a time determined by the time constant of the capacitor C1. Since this time constant is longer than the on-time of transistor Q1, abnormality detection circuit 10 does not operate during normal storage operation. And transistor Q2
When turned on, current flows through relay Re2, and relay Re
2 closes the normally open contact r2. Therefore, even if power is supplied to the fire receiving circuit 4 and the contact rl of the relay Re1 becomes inoperable, power will not be supplied to the fire receiving circuit 4 and the fire receiving circuit 4 will become inoperable. It is prevented.

When the relay Re2 is operating like this, the light emitting diode LD connected in parallel to the relay Rez
If it is made to emit light when the transistor Q2 is turned on, an abnormality occurs in the storage type receiver and a storage type notification can be issued in an emergency state.

[Effects of the Invention] As described above, the present invention includes an abnormality detecting means for detecting that the relay for shutting off the inoperable means has become inoperable, and when the abnormality detecting means detects an abnormality, the inoperable means A bypass relay is installed to supply power from the power supply circuit to the fire receiving circuit by bypassing the relay, and if for some reason the cutoff relay is switched to not supply power to the fire receiving circuit. Then, the abnormality detection means that detects this abnormality drives the bypass relay, which bypasses the cutoff relay and supplies power to the fire receiving circuit. It is possible to prevent the storage type receiver from becoming inoperable due to a failure, and there is an effect that the reliability of the operation of the storage type receiver can be improved.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing a conventional example, and Fig. 3 is a circuit diagram showing an embodiment of the present invention.
:! el 1118 FVI f-1 is a fire detector, 2 is a power supply circuit, 3 is a fire reception cutoff circuit, 4 is a fire reception circuit, 5 is a fire signal detection circuit, 6.7 is a timer circuit, 8
9 is a time constant circuit, 10 is an abnormality detection circuit, Re, Re2 relays, Ql, Q2 are transistors, and 1 and r2 are contacts.

Claims (2)

[Claims] (1) A fire detector that detects and responds to smoke or heat, a fire reception circuit that receives a fire signal from the fire detector, a power supply circuit that supplies power to the fire reception circuit, and the fire detector A fire signal detection circuit that detects a fire signal from the fire earlier than the fire reception circuit, and a fire signal detection circuit that stops the power supply to the fire reception circuit of the power supply circuit at the output of the fire signal detection circuit so that the fire reception circuit can receive the fire signal. A storage type receiver comprising an inoperable means having a cut-off relay that is inoperable for a certain period of time, an abnormality detection means for detecting that the cut-off relay of the inoperable means has become inoperable; A storage type receiver comprising a bypass relay that bypasses the relay of the inoperable means and supplies power from the power supply circuit to the fire reception circuit when the abnormality detection means detects an abnormality. (2) The storage type receiver according to claim 1, further comprising an indicator such as a light emitting diode to indicate that the cutoff relay is in an abnormal state when the abnormality detection means detects an abnormality.