JPS5835267Y2 - Flame sensor for fire extinguishing equipment - Google Patents

Description

[Detailed explanation of the invention] A weak electric current is constantly passed through the fuse, and the fuse is blown by the heat of the fire.The electrical change is detected and a fire extinguishing system is activated via a relay or the like. The operating devices have been in use for a long time, but these existing devices
This circuit combines a fuse and a transistor, and requires a DC power source to use the transistor.

The present invention provides a flame sensor that does not require a DC power source and consists of a simple circuit.

The present invention will be explained below with reference to Examples.

A diode 1 and a fuse 2 are connected in series, and a diode 3 is connected in parallel to the diode 1, so that the diode 3 has a direction opposite to that of the diode 1.

A resistor 4 is connected to this circuit end a, which is connected to a transformer 5 of an AC power source, and the circuit end a is connected to the other end of the transformer 5.

Further, a diode 6, a resistor 7, and a photothyristor 8 are connected in series to the circuit ends a and l), and an SCR 9 and a varistor 1 are connected to the active end cd of the photothyristor.
0 is connected, and the circuit end ef of 5CR9 and the varistor 10 is connected to the power supply 12 via the solenoid 11 in series.

13 is a capacitor, 14 is a transformer connected in series,
It is connected to the circuit end al).

16 is a diode, and 17 is a neon lamp.

Typically, the power supply 12 is 100 V, stepped down by the transformer 5 to, for example, 24 V.

The solenoid 11 is provided to start a fire extinguishing system, and when it is energized and activated, a fire extinguishing system (not shown) is activated.
The mechanism is such that extinguishing agents are released.

Normally, the voltage 24V supplied by the transformer 5 through the opposite diodes 1 and 3 is mostly dropped by the resistor 4, and the voltage at the circuit end al) is as low as O, SV.

At a voltage of about 0.8 V AC, the photothyristor 8 does not operate via the diode 6 and resistor 7.

Next, when fuse 2 blows due to the heat of the fire, since only diode 3 is bridged to circuit end al), the AC voltage of 24V passes through diode 3, is half-wave rectified, and is transferred to circuit end al). A high potential is generated due to the half wave.

This passes through diode 6, resistor 7, and capacitor 13.
The voltage becomes a DC voltage, and the photothyristor 8 is operated.

Then, due to the potential difference generated at the operating end CD of the photothyristor 8, 5CR9 is activated to establish an AC circuit, energizes the solenoid 11, the solenoid 11 is activated, and the fire extinguishing system is activated.

The varistor 10 serves to prevent noise from entering from the outside.

When the electrical circuit between 10,000-a-a and bb-b is disconnected, an alternating current voltage is applied to circuit end a (circuit at the bottom of the drawing), but it is caused by capacitor 3, the voltage is low, and the photothyristor doesn't work.

However, a current of approximately 24 V/R flows through the capacitor 13, and the neon lamp 17 lights up through the transformer 14, indicating that the wire is disconnected.

Further, by switching the circuit using the changeover switch 15, disconnection and operation tests can be performed.

In the disconnection test, the result is the same as if the line aa was cut, and in the operation test, the line aa was cut and the diode 16 was inserted at the end of the circuit to obtain the same operating state.

In this device, a switching circuit such as a relay may be used instead of the photothyristor.

The present invention requires a configuration consisting of the above circuit, and the circuit is simple, and as in the embodiment, a disconnection test can be easily performed, making it a convenient device.

There is always very weak current consumption between circuits aa and l) and b.
It is a stable device with no voltage drop due to wiring and no malfunctions due to circuit breaks.

[Brief explanation of drawings]

The figure is an electrical circuit diagram of a flame sensor according to an embodiment of the present invention. 1.3...Diode, 2...Fuse, ab...Circuit end.

Claims (1)

[Scope of utility model registration request] A diode and a fuse are connected in series, and the diode and a reverse diode are connected in parallel to supply AC power to this circuit end. When the fuse is blown by the heat of the fire, a potential difference due to an alternating current half wave is generated at the ends of the circuit, and this voltage is detected to operate the switching circuit and drive the device. A flame sensor for fire extinguishing equipment made as follows.