JPH044313Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Technical field of the invention] This invention is used to repair part or all of buildings, etc.
Or, regarding temporary fire alarms that are temporarily installed to warn of fire during remodeling, etc., improvements to the one previously filed by the applicants as Utility Model Application No. 1983-130891 (Utility Model Application No. 59-37692). It is related to.

[Technical background of the invention and its problems]

When renovating or redecorating a building, the existing fire detector and the wiring connecting the fire detector and the fire receiver are usually removed, and the ceiling, floor, and walls are renovated. However, when renovations or construction work lasts for several days or months, temporary electric wires have traditionally been strung out and fire detectors have been connected to these wires to guard against fires during the renovation work. However, such temporary lighting wires are often confused with other temporary lighting wires, etc., and are often cut when the temporary lighting wires are removed, impairing the fire detection function. There were problems such as obstruction to opening and closing of doors, etc.

As a solution to these problems, the applicants first proposed
What was proposed as No. 57-130891 (Utility Model Application No. 59-37692) is a transmitter that transmits a unique radio wave based on the output signal of a fire detector, and a transmitter that receives the radio wave and receives the resulting received signal. This is a temporary fire alarm equipped with a receiver that supplies signal lines connected to the input terminal of the existing central fire monitoring system, but if commercial power is used as the power source for the transmitter, a In addition to requiring temporary power lines, which may be disconnected for the reasons mentioned above, it is difficult to supply commercial power to any part of the building under renovation, and batteries are used to power the transmitter. In this case, there was a risk that the fire signal could not be transmitted due to the battery voltage decreasing due to battery life, resulting in a false alarm.

In addition, conventional fire alarm transmitters that use batteries periodically monitor the battery voltage and send an alarm signal when the voltage drops below a certain value, allowing for early replacement of batteries that have reached the end of their service life. Techniques for improving the reliability of notifications are also known (for example, Utility Model Application Publication No. 15285/1983 and Publication No. 77135/1983). However, the above conventional technology simply monitors the output voltage of the battery, and does not monitor the battery voltage when the transmitter is actually operating, so it does not provide sufficient reliability. There were flaws.

In other words, if the battery no longer has enough current capacity to drive the transmitter, a sufficient output voltage is obtained when the transmitter is not being driven, but when the transmitter is driven, the load will cause the output voltage to drop suddenly. There is a property that the output voltage decreases and it becomes difficult to send a fire signal. Conventional techniques have the disadvantage of not being able to deal with such cases.

[Purpose of invention]

This idea was made in view of the above circumstances, and uses batteries as a power source for transmitters installed in various parts of the building, and periodically applies a pseudo load equivalent to the load of the operating transmitter to the battery. When the battery voltage is below a predetermined voltage, the transmitter sends a battery failure signal to the receiver, and the receiver identifies and displays this so that battery failure can be automatically monitored. The purpose of this project is to provide a temporary fire alarm system.

[Summary of the idea]

In order to achieve the above object, the present invention is a temporary fire alarm consisting of a transmitter that is driven by a battery power source and transmits a fire signal by the operation of a fire detector, and a receiver that receives and displays this fire signal. In the machine, a pseudo load corresponding to the operating load is periodically connected to the battery power supply to the above transmitter, and a battery failure signal is sent when the battery voltage drops below a certain value when the pseudo load is connected. The present invention is characterized in that a highly reliable fire alarm system is realized by being equipped with a function to detect not only a decrease in the voltage of the battery power source but also a decrease in current capacity.

[Example of idea]

Next, the temporary fire alarm system of the present invention will be explained in detail based on the drawings showing one embodiment thereof.

FIG. 1 shows a circuit diagram of a transmitter according to the present invention, and FIG. 2 shows a block diagram of a receiver according to the present invention.

In FIG. 1, a transmitter 10 includes a power source battery 1, a battery voltage detection circuit 2 connected to both ends of the battery 1, which sends out a signal when the battery voltage drops below a predetermined value, and a pulse generator that periodically generates pulses. 3 and a transistor Tr1 that is periodically brought into conduction by the output pulse of the pulse generator 3 and connects a pseudo load resistor R to the battery 1, and these are connected to the battery 1 to form a battery failure detection circuit 7. are doing.

The feature of the present invention is that the pulse generator 3, the pseudo load R, and the transistor Tr1 are provided.

Further, in the transmitter 10, an oscillation modulation circuit 5 and an amplifier circuit 6 are connected between the terminals of the battery 1 via the emitter-collector circuit of the transistor Tr2 from the battery 1, and a transmitting antenna 9 extends from the amplifier circuit 6. There is. The output terminal of the OR circuit 4 is connected to the base electrode of the transistor Tr2.
One of the input terminals of is connected to the output terminal of the battery voltage detection circuit 2, and the output of this battery voltage detection circuit 2 is further connected to one of the input terminals of the oscillation modulation circuit 5. The other input terminal of the OR circuit 4 is connected to a series connection point a between a fire detector D and a resistor 8 connected between the terminals of the battery 1 via a resistor 8, and this connection point a is further connected to an oscillation modulation circuit. is connected to the other input terminal of 5.

The receiver 20 shown in FIG.
7, a tuning circuit 11, a frequency converter 12, a local oscillator 18, a wave detector 13, a signal discriminator 14, a fire indicator 15, and a battery defect indicator 16, respectively.

The operation of the temporary fire alarm system of the present invention will be described below. In the normal fire monitoring state, the fire detector D is in a non-conducting state, and the pulse generator 3 periodically (for example, once every 2 to 3 minutes)
A pulse is generated, the transistor Tr1 is turned on, and the load resistance R corresponding to the load of the oscillation modulation circuit 5, the amplifier circuit 6, etc. is instantaneously connected to the battery 1, and the voltage at this time is detected by the battery voltage detection circuit 2. ing.

When the fire detector D operates, the potential at the connection point a between the fire detector D and the resistor 8 increases, this signal is applied to the OR circuit 4 and the oscillation modulation circuit 5, the transistor Tr2 is made conductive, and the oscillation modulation circuit 5 , a battery 1 is connected to an amplifier circuit 6, an oscillation modulation circuit 5 modulates a carrier wave with a signal of a frequency corresponding to the operating signal of a fire detector D, this output is amplified by an amplifier circuit 6, and a fire alarm is transmitted from a transmitting antenna 9. It is sent out as a signal radio wave.

When the load resistor R is connected and the voltage of the battery 1 falls below a predetermined voltage, a battery failure signal is applied from the battery voltage detection circuit 2 to the OR circuit 4 and the oscillation modulation circuit 5, similar to when the fire detector is activated. Then, a carrier wave is modulated with a signal of a frequency corresponding to the battery failure signal to generate a battery failure signal radio wave, and the battery failure signal radio wave is transmitted from the transmitting antenna 9.

In the receiver 20, when a fire signal radio wave or a battery failure signal radio wave is received by the receiving antenna 17 and the tuning circuit 11, this is mixed with the output of the local oscillator 18 by the frequency converter 12, and the output is detected by the detector 13. The signal is demodulated and identified by a signal identification circuit 14 consisting of a bandpass filter, etc. If it is a fire signal, a fire indicator 15 is lit, and if it is a battery failure signal, a battery failure indicator 16 is lit.

Incidentally, perpsers or the like may be used as the indicators 15 and 16, and these may also be arranged side by side.

[Effect of idea]

As mentioned above, the temporary fire alarm system of this invention is
The battery used to power the transmitter is tested under the same conditions as the transmitter's operating conditions to discover battery defects based on battery life, etc., making it possible to prevent missed alarms due to battery defects with high reliability. It has the effect of becoming.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a transmitter of this invention, and FIG. 2 is a block diagram showing an example of a receiver of this invention. 1... Power supply battery, 7... Battery defect detection circuit, D
... Fire detector, 5 ... Transmission modulation circuit, 10 ...
Transmitter, 12... Frequency converter, 13... Detector, 14... Signal identifier, 15, 16... Display device.

Claims (1)

[Scope of Claim for Utility Model Registration] A temporary fire alarm comprising a transmitter that transmits a fire signal radio wave according to the operation of a fire detector, and a receiver that receives and displays the fire signal radio wave, which comprises: The transmitter includes a battery power source, a pseudo load having a resistance value corresponding to the load resistance during radio wave transmission, a pseudo load connection means for periodically connecting the pseudo load to the battery power source, and the pseudo load. battery voltage detection means for detecting the output voltage of the battery power source when the battery power source is connected to the radio wave power source and outputting a battery failure signal when the voltage drops below a predetermined value; and in the event of a fire or battery failure. The receiver includes a radio wave transmitting means to which the battery power source is connected and transmits a fire signal radio wave or a battery failure signal radio wave, and the receiver includes a signal detecting means for receiving the signal transmitted by the transmitter, and a radio wave transmitting means for transmitting a fire signal radio wave or a battery failure signal radio wave. A hypothetical fire alarm comprising an identification means for identifying whether a fire signal radio wave or a battery failure signal radio wave is received, and a display means for displaying when a fire signal radio wave or a battery failure signal radio wave is received. .