JPS62133976A - Inspection apparatus of fire alarm equipment - 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 [Industrial Field of Application] The present invention mainly relates to a maintenance and inspection device for fire alarm equipment, and particularly to an inspection device that can be efficiently carried out by a small number of people.

[Conventional example]

For fire alarm equipment, these tests are generally carried out manually every six months or a year; thermal detectors are heated with a heating tester, and smoke detectors are still tested by a smoke test. Fire alarms were activated by amplifying smoke with a fire alarm, and fire receivers located at central monitoring stations confirmed this activation signal and performed restoration operations.

In such inspections, especially for sensors that use semiconductor switching elements such as smoke detectors, the switching element itself has a self-holding function, so once it has activated, it will not recover even if the smoke is removed, so the sensor After activation, the sensor automatically recovers by intermittent power supply to the sensor (Utility Model Publication No. 56-5198), or a signal unique to each line is used to identify such an activated line on the sensor side. A system has been proposed that generates a signal and sends it wirelessly to the sensor (Utility Model Application No. 7182/1982).

[Problem that the invention seeks to solve]

However, in such conventional systems, for example, in the former case, a special recovery circuit must be installed in the fire receiver in advance, and if there are many lines, it is difficult to determine which line is operational on the detector side. I can't tell if it did. In addition, in the latter case, the automatic recovery of the sensor with a self-holding function was not possible, and there were problems such as difficulty in identifying the sensors when testing the operation of the sensors on multiple lines at the same time. .

[Failure to solve the problem]

This invention solves all of the drawbacks of the conventional test devices as described above, and in order to enable easy connection and use with existing fire alarm equipment, the present invention has been developed to provide a fire receiver that is connected to each district track. , a voltage detection circuit that detects a drop in the line voltage, an oscillator, a short-circuit circuit that shorts the district line by an AND output of the voltage detection circuit and the oscillator, and responds to the district line based on the voltage drop of the district line. The device is equipped with a transmitter that transmits radio waves with a specific frequency, and a receiver that receives the radio waves and issues an identification display and/or an alarm.

[Embodiment] Fig. 1 is a circuit diagram showing an embodiment of the transmitter of the device of the present invention, Fig. 2 is a block diagram of main parts of the receiver, and Fig. 3 is a time chart for explaining the operation of each part. are shown respectively. In the figure, Re is the existing fire receiver, TM is the transmitter, and R
, C indicate receivers, respectively.

The fire receiver Re shown in Fig. 1 is of a commonly used type, including the power supply area relay RL, ~? A plurality of fire detectors De are connected between the respective district lines 1, . In each district relay RL, ~1, a self-holding contact r l 1 '' n is connected in parallel to the power supply via a backflow prevention/earth diode d, ~dyL, and an automatic recovery switch SWl, respectively. Although some relays RL,~1 use semiconductor circuits, they have similar functions, and these district relays RL,~1
Based on the operation of step 1, a display/alarm device (not shown) is driven.

During inspection, as shown in the diagram, the fire receiver Re's district track! , ~1 connection terminals L1-n, a line l extending from the transmitter TM to C; ~1. C' is connected. This swamp~1 and
A series circuit of resistors R,,R, is connected between 07 and 07, and an inverter INV is connected to this series connection point.

is connected to one input terminal of AND gate G1 via
These constitute a voltage detection circuit that detects the line voltage of the district line 11. The output of the inverter INV is further applied to the control input terminal of the electronic switch P. The other input of the AND gate GI is connected to the common oscillator 08.
is connected to co via capacitor C0, and this A
The output of the ND gate GI is a monostable multi-MM.

Furthermore, the output of this monostable multi-MM is applied to the pace electrode of the transistor Tr1 which shorts the district line 11. Moreover, the electronic switch P mentioned above.

A natural frequency oscillator OSC, which is controlled by the oscillator OSC, is provided.

Such a voltage detection circuit, a monostable multi-MM, a transistor Tr that becomes a short circuit, and a natural frequency oscillator O
In this embodiment, a series of circuits consisting of SCs are provided in a number corresponding to the number of district lines.
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To No. 51, each natural frequency oscillator OSC,
-, the output of antenna AN
It is transmitted as radio waves from T.

A transmitter T is connected to the receiver RC shown in FIG.
A bandpass filter BPF, ~, corresponding to the natural frequency oscillator OSC, ~7L of M is connected to the output side thereof, and is connected to the respective output terminals 1-n via a comparator CMP, ~U, and by this output, A display, alarm, etc. (not shown) is driven.

The operation of the apparatus of the present invention will be explained based on the time chart shown in FIG.

When the smoke detector S among the sensors De connected to the district line 1+ shown in FIG.
The voltage drops to a level that remains the voltage drop V due to relays such as the above, indicator lights (none of which are shown), etc. As a result, the voltage of the resistor R2-1 connected to the input gate of the inverter INV of the transmitter TM decreases, the output of the inverter INV becomes H, and the AND gate G and the electronic switch P
, is applied to. The oscillator 08co is excavated as shown in Fig. 3 08co, and the output via this capacitor C6 has a differential waveform as shown in Fig. 3 01-1, and the positive side of this output is applied to the AND gate G. , it drives a monostable multi-MM. The output of the monostable multi-channel MM has a waveform as shown in FIG. 3, and during this time, the transistor Tr, which shorts the district line l, is turned on.

Natural frequency oscillator 080, power, etc. From the moment electronic switch 1 is turned on, the natural frequency changes to modulator MOD,',
・.

is applied to the antenna ANT, and from it is applied to the antenna ANT.
Radio waves as shown in ' are being transmitted.

When the smoke sensor S is not restored by a single operation of the transistor Trl, the oscillator 08co repeatedly and periodically turns on the transistor Tr to perform a restoration operation. In the third diagram, the second transistor Tr1 is turned on.
The signal is restored, and the voltage of the district line 11 is restored to the original monitored voltage, as shown by the square in FIG. 3 L1.

If a person who has previously tested the operation of the fire detector De carries a receiver RC as shown in Figure 2, then
The output waveform shown in is the bandpass filter B P
1 comparator CI) M.

An output as shown in FIG. 3 is obtained at terminal 1 via the terminal 1.

Therefore, the inspector can identify the operation and the operating line by using the display or alarm based on this output, and can check the operation of each sensor in sequence after confirming that the sensor has been restored.

In large buildings, it is possible to test the operation of fire detectors on multiple floors simultaneously, and in this case it is sufficient to prepare multiple receivers RC. Further, the operation of each part at this time is the same as described above.

If a sound generator is used as the natural frequency oscillator 08CI~1 of the transmitter TM, and a speaker or the like is used as the alarm device of the receivers R and C, the device of the present invention can detect the number of active lines by hearing the existing equipment. Fire alarm equipment district tracks 11-l
Even if a fire detector with a self-holding function is connected to a fire detector, it can be automatically and reliably restored, and operation inspectors can easily identify which district lines are in operation and which ones have been restored. Inspection work can be carried out efficiently with a small number of people. moreover,
It has features such as being able to check the operation of multiple lines at the same time.

[Brief explanation of drawings]

The drawings show an embodiment of the device of the present invention, FIG. 1 is a circuit diagram of a transmitter, FIG. 2 is a circuit diagram of a receiver, and FIG. 3 explains the operation of each part in FIGS. 1 and 2. The time charts for each are shown below. Re...Fire receiver, De...Fire detector, 11~
11... District line, TM... Transmitter, 08co...
・Oscillator, Ill"... Transistor, OSC, ~OSC,,... Natural frequency generator, P1-P7L... Electronic switch, AN
'L',, ANT2...Antenna, l'viOD・
...Modulator, RC...Receiver, OEMO...Demodulator, El)F, ~BI)F-rL, -Bandpass filter, CMP. ~CMP□... Comparison circuit.

Claims (1)

[Claims] a voltage detection circuit that is connected to each district line of the fire receiver and detects a drop in line voltage; an oscillator; a short circuit that shorts the district line by an AND output of the voltage detection circuit and the oscillator; a transmitter that transmits radio waves with a unique signal corresponding to the district line based on the voltage drop in the area;
An inspection device for fire alarm equipment, comprising a receiver that receives the radio waves and issues an identification display and/or an alarm.