SU1332105A1 - Apparatus for monitoring flame - Google Patents

Abstract

The invention relates to automatic flame monitoring means and allows for increased reliability of the device. The photoresistor 3 is installed on the front panel of the boiler, thus, so that only a controlled torch is in its field of view. With an excessive increase in the flame in the furnace device, its resistance decreases, the operating current passing through the coil 6 of the measuring device increases. Pins 10 and 11 are closed and a beep sounds. When the torch goes out, contacts 9 and 1.1 are closed, including the electrical signal supply circuit to the fuel cutoff. The stability of the operation of the circuit with fluctuations of the environment t-ry is carried out with the help of a solid-sea resistance 8 with a negative t-factor. 1 il. SP

Description

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The invention relates to automatic means of automation intended for operation in the open atmosphere of the atmosphere in which the ambient air temperature varies within (-60) - (+ 85) ° C, and to control the combustion of gas or fuel oil in boiler furnace

The purpose of the invention is to increase reliability.

tfe. Fig. 1 is a schematic diagram of a flame control device.

The device contains a power source 1, a variable resistor 2, a photoresistor 3, a capacitor 4 and a constant resistor 5. The measuring device coil 6 is connected in series with the variable resistor and photoresistor. The second variable resistor 7 and the thermistor 8 are connected in parallel to the coil b of the measuring device, which is equipped with movable contacts 9-11, included in the signaling and blocking circuit.

The power source 1 provides a stabilized DC voltage. The photoresistor 3 is installed on the front panel of the cat- that in its field of the mature unit, only a controlled torch does not fall. If the flame increases too much in the combustion device, its resistance decreases, the operating current increases, the passage w increases, and the measuring device coil 6 begins to approach, contact 11 begins to approach contact 10, and when closed, the electrical signal is emitted. When the flame decreases, flame extinction may occur, and the working space will begin to be filled with gas or fuel, which ultimately can lead to an explosion. Therefore, contact 9 is used to control the limits of the steady flame burning. When flame brightness decreases, the current passing through the coil 6 of the measuring instrument, as a result, the contact 11 moves in the direction of the contact 9 until it touches it. When they come in contact, an electrical signal supply circuit to the fuel cut-off device is turned on. The stability of the operation of the scheme with fluctuations in the temperature of the surrounding air medium over relatively wide limits is carried out by psi

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Thermistor assistance with a negative temperature coefficient. To obtain a signal proportional to the artificial study of the illumination, and to linearize the measurement characteristics of the illumination of the combustion device, the photoresistor 3 is bounded by a resistor 5. The fine adjustment of the scale of the device, which is scaled in lux, corresponds to a certain value of the artificial illumination of the combustion space measured by the luxometer, variable resistors 2 and 7, the axes of which are derived under the slots. By changing the electrical parameters of the current flowing through the coil 6 of the measuring device, the calibration of the device corresponds to the readings of the lux meter. The device operates stably with fluctuations in ambient air temperature (-60) - (+ 85) ° С. The photo-5 resistor can, if necessary, be installed at a considerable distance from the device, and the length of the connecting line does not have a noticeable effect. accuracy of device readings. Device: Your device has a wide range of setpoints for shutdown, which can cover the full scale of a measuring instrument. Since it is constant, the time that determines the thermal inertia of a thermore

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the shunt photoresistor is small, and the zener diode has an internal thermal stabilization, the device with low inertia monitors all changes in ambient air temperature, which stabilizes the operating mode, which automatically maintains the operating parameters during operation of the flame control device.

Claims (1)

Invention Formula A flame control device containing a power source connected to a series-connected variable resistor, photoresistor and measuring instrument coil, a constant resistor, a second variable resistor and an alarm circuit, characterized in that it is equipped with a capacitor and a thermistor to increase reliability. 313321054 and the measuring device is a movable marine resistor together with a second alternating contact, with the capacitor being switched on in parallel with the first variable resistor by the on-resistor. measuring coil, resistor, constant resistor on | the vise contacts of which are included in the cw parallel to the photoresistor, the alarm and interlocking circuit.