JPS62173598A - Accumulation circuit for double type smoke sensor - 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] The present invention relates to a storage circuit for a two-signal smoke detector.

[Background technology]

This type of dual-signal smoke detector was recently developed to prevent malfunctions, and first operates in an intensity mode that detects even light smoke, and then in a low intensity mode that detects thick smoke. It automatically switches to sensitivity mode.

FIG. 3 shows the configuration of a conventional two-signal smoke detector.

The smoke detection circuit 1 includes OR-connected diodes Dx and D.
2, two constant voltage circuits with different output levels 1.2
A voltage of a predetermined level is selectively supplied. The smoke detection circuit 1 operates in a high sensitivity mode when receiving the output from the constant voltage circuit 1, and operates in a low sensitivity mode when receiving the output from the constant voltage circuit 2. The outputs of the voltage circuits 1 and 2 are connected to two M product parts 31°3.
When the smoke detection signal is received from the smoke detection circuit 1, it accumulates for a preset time and generates a trigger signal, and the switching element S
CR1 or S-CR2 is driven to drive a relay unit (not shown) to operate a fire alarm or smoke prevention equipment.

In the example shown, when PUTI is triggered in high sensitivity mode, 5CRI is turned on, and in low sensitivity mode, PUT2 is turned on.
When triggered, 5CR2 turns on. In addition, in such a configuration, the two storage sections 31 and 32 provided in the storage circuit 30 can respectively set the storage time in the high sensitivity mode and the storage time in the low sensitivity mode. .

Incidentally, the accumulation time of the smoke detector can be freely set in either the high-sensitivity mode or the low-sensitivity mode, but in the accumulation circuit with the above configuration, the two accumulation sections 31 and 32 start the M product operation at the same time. Therefore, the accumulation time in high-sensitivity mode is set short, and the M-integration time in low-sensitivity mode is set to be long. There is no problem if the accumulation time is set short (see Figure 4), but if the accumulation time is set short in high sensitivity mode and low sensitivity mode (
For example, if the sensing mode is a combination of type 2 non-accumulation and type 3 non-accumulation), correct operation cannot be expected in the low sensitivity mode, which significantly reduces the reliability of the smoke detector. For example, depending on the setting of the accumulation time in the high sensitivity mode and the low sensitivity mode, a switching means that should operate in the low sensitivity mode may operate in the high sensitivity mode (see FIG. 5). In this case, in the high-sensitivity mode, only the fire alarm is activated, but in the low-sensitivity mode, the smoke prevention equipment is activated, causing a serious problem.

Therefore, with the storage circuit having the above configuration, it is not possible to set the storage time in high sensitivity mode and low sensitivity mode to a small value, and it is not possible to obtain a smoke detector with fast sensing operation. .

[Purpose of the invention]

The present invention was made in view of the problems with ridges.
The purpose of this paper is to improve a two-signal smoke detector in which the storage circuit has two storage sections, and to provide a two-signal smoke detector storage circuit that can be used especially for smoke detectors with fast detection operation. There is.

[Disclosure of the invention]

In order to achieve the above object, the proposed storage circuit of the present invention relates to an improvement of the storage circuit of a two-signal smoke detector that operates according to the output level from the constant voltage power supply supplied to the smoke detection circuit. The storage circuit is provided with two storage sections to form a first storage section and a second storage section, and a switching circuit that switches the second storage section according to the output level from the constant voltage power supply. By the switching operation of this switching circuit, the operation of the second storage section is blocked when the first storage section starts storage, and the operation of the second storage section is stopped when the storage operation of the first storage section is completed. The device is characterized in that it is configured to start an operation.

Example FIG. 1 shows an embodiment of the present invention.

1 is a smoke detection circuit that operates in two sensitivity modes depending on the input voltage level, and 21. 22 is a constant voltage circuit that outputs different voltage levels Vl and V2. ). DI and D2 are OR-connected diodes for selectively supplying the outputs of the constant voltage circuits 21 and 22 to the smoke detection circuit 1, and Tri is a transistor that is turned on by a smoke detection signal from the smoke detection circuit 1.

5CRI and 5CR2 indicate switching elements that are driven in high-sensitivity mode and low-sensitivity mode, and the part surrounded by 3 is the storage circuit of the present invention. , DL, and C are a high-sensitivity line, a low-sensitivity line, and a common line of the smoke detector.

To explain the basic configuration of the storage circuit 3, the first and second storage sections are configured with trigger circuits of PUTI and PUT2, respectively, and the operating level of the smoke detector Vll,
The voltage between G- of PUTl and PUT2 that defines VL is:
Shared voltage VR3 of resistor R3 in series circuit of resistors R3 and R4
It is taken out by

A first CR open circuit in which R1 and CI are connected in series is provided on the anode side of PUTI, and a second CR open circuit in which R2 and C2 are connected in series is provided on the anode side of PUT2. A series circuit of resistors R3 and R4, and the first . The output end of the second CR open circuit constant voltage power supply 2 and the common line C are connected in parallel with each other, and the output from the constant voltage power supply H2 is supplied. The cathode of PIJTI is connected to the gate of switching element 5CRI, and the cathode of PUT2 is connected to the gate of switching element SCR2.

Also, 1st. Second CR open circuit capacitor CI.

A diode D4.C2 is connected to the input terminal of C2. The anodes of the diodes D3 and D3 are connected to each other, and the cathodes of the diodes D4 and D3 are connected to the collector of the transistor Tri. The helix of the transistor Tri is connected to the smoke detection circuit l, and its emitter is connected to the common line C.

Furthermore, the input terminal of the second CR open circuit capacitor C2 is connected to the collector of a transistor Tr2 via a diode, and the hemisphere of this transistor Tr2 is connected to a constant voltage current tX.
It is connected to the output end of the constant voltage circuit 21 composing the circuit 2. In the embodiment, this transistor Tr2 constitutes a switching circuit, but it may be constituted by a relay or other switching means.

Note that a resistor R5 and a Zener diode ZD connected in parallel with the resistor R4 ensure the reset operation after the PUTl,2 is triggered.

Next, the operation of a smoke detector using the storage circuit of the present invention will be explained.

When the three input terminals DL and C of the constant voltage power supply 2 are energized, the diode D1 is turned on and the diode D2 is turned off, and the output of the constant voltage circuit 21 is supplied to the smoke detection circuit 1. As a result, the smoke detection circuit 1 enters the high sensitivity mode. In this state, when the detection circuit 1 detects burying, it outputs a smoke detection signal ("L" level). Then,
The transistor Tri that was ONL is turned off, the output of the constant voltage circuit 21 is supplied to the storage circuit 3, and the operating level of the storage circuit 3 is set to the high voltage Vll in the high sensitivity mode. At the same time, the transistor Tr2 is also turned ON by the output of the constant voltage circuit 21.

As a result, triggering of PUT2 becomes impossible, and only triggering of PUT1 becomes possible. That is, the first CR open-circuit capacitor C1 is charged and the terminal voltage VC1 reaches the operating level VH, and the PUTI is triggered to turn on the switching element SCR1 and drive a relay (not shown) to issue a fire alarm. The device works.

Then, when SCR1 is turned on and the operation in the high sensitivity mode as described above is completed, there is a short circuit between L and C, so the output of constant voltage circuit 21 becomes 0, diode DI is turned off, and diode D2 is turned on. , constant voltage circuit 22
The output of is supplied to the smoke detection circuit 1. That is, the low sensitivity mode is entered, and at the same time, the operation level of the storage circuit is also set to a level VL corresponding to the low sensitivity mode. Also, at this time,
Since there is no output from the constant voltage circuit 21, the transistor Tr2 is turned off.

In this state, when the detection circuit 1 detects smoke (it switches to a lower sensitivity mode, it is necessary to detect smoke with a higher concentration than in the high sensitivity mode), the transistor Tri turns OFF, and the storage circuit 3 starts the storage operation.

That is, charging of the capacitor C2 of the second CR@path of the second storage unit 6 is started, and after the set storage time, the PU
T2 is triggered and 5CR2 turns on. At this time, the first storage section also starts the storage operation, but the PU
Even when Tl is triggered, SCR1 is not turned on because LC is already shorted. Therefore, in the low sensitivity mode, 5C is generated after M integration time of the second storage section 6.
Only R2 turns on.

FIG. 2 shows a timing chart explaining the above operation.

〔Effect of the invention〕

According to the storage circuit of the present invention, in a two-signal smoke detector, the storage operation in the low sensitivity mode is started after the high sensitivity mode is completed, so that Even if the accumulation time in the sensitivity mode and the low sensitivity mode is set to a short value, highly reliable sensing operation can be expected without causing malfunctions like in the past.

Therefore, the combination of accumulation times of the smoke detector can be arbitrarily set and used, and the smoke detector can be used in any combination of sensing modes.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, FIG. 2 is a timing chart explaining its operation, FIG. 3 is a circuit configuration diagram of a conventional example, and FIGS. 4 and 5 are operations of a conventional example. 2 is a timing chart illustrating. (Explanation of symbols) 1...Smoke detection circuit 2...Constant voltage power supply 3...Storage circuit 4...Switching circuit 5...First storage section 6...Second storage section patent Applicant Matsushita Electric Works Co., Ltd. Agent Patent Attorney Hiroyuki Gyudon Figure 2 PUT1 Trigger PUT2) Riga Figure 4 Figure 5

Claims (1)

[Claims] A storage circuit for a two-signal smoke detector that operates according to the output level from a constant voltage power source supplied to the smoke detection circuit, wherein the storage circuit is provided with two storage sections. a first storage section;
The second storage section is provided with a switching circuit that operates to switch according to the output level from the constant voltage power supply, and the switching operation of the switching circuit causes the first storage section to switch. When the accumulation of
1. A storage circuit for a two-signal type smoke detector, characterized in that the storage circuit is configured to prevent the operation of the storage section and to start the storage operation of the second storage section when the storage operation of the first storage section is completed.