KR940015423A - Exhaust fan rotation speed control device and method for gas boiler - Google Patents

Abstract

The present invention relates to an apparatus and an automatic control method for automatically controlling the rotational speed of an exhaust fan in a gas boiler, a petroleum combustion device, and the like. Regardless of the fluctuation of the year load, the exhaust fan is driven at a constant rotation speed (= RPM) or a constant torque, so incomplete combustion occurs due to fluctuations in the year load, resulting in reduced combustion efficiency and CO, CO ₂ gas. And increase of power consumption due to excessive exhaust fan rotation speed setting at normal load.

The present invention detects the rotation speed of the exhaust fan and the voltage level supplied to the exhaust fan motor, calculates the year load therefrom, determines the fluctuation of the year load according to the calculated load, and rotates the exhaust fan according to the determined year load. By increasing or decreasing the number, it is possible to control the combustion in the optimum combustion state, and to suppress the harmful gas generation and reduce the power consumption. It is applied to gas combustion equipment and petroleum combustion equipment.

Description

Exhaust fan rotation speed control device and method for gas boiler

Since this is an open matter, no full text was included.

1 is a circuit diagram of the exhaust fan rotational speed control apparatus of the present invention, Figure 2 is a flow chart of the exhaust fan rotational speed control method of the present invention, Figure 3 is a rotational speed according to the exhaust fan load change according to the present invention: voltage graph.

Claims (5)

Fan rotation speed control unit for increasing or decreasing fan rotation speed by varying the duty ratio of the fan power supply unit 1 for supplying power to the exhaust fan drive motor and the power supplied from the fan power supply unit 1 to the exhaust fan drive motor. (2) and the year load is determined from the fan power level supplied from the fan power supply unit 1 and the fan speed detection value input from the fan speed detection unit 4, and in response to the determination result, the fan speed control unit ( 2) a microcomputer 3 for driving control of the exhaust fan through a fan, and a fan speed detection unit 4 for supplying a rotation detection signal input corresponding to the rotation of the exhaust pin to the microcomputer 2 as fan speed detection information. And a fan power switching control unit 5 for controlling the switching switching operation of the fan power switching control unit 6 according to the rotation detection signal of the exhaust fan, and under the control of the fan power switching control unit 5 of the exhaust fan drive motor. To switch the power supply path Exhaust fan rotation speed control device of a gas boiler composed of a fan power switching unit (6). The detection control unit (7) according to claim 1, wherein an overload of the fan driving motor is detected by detecting switching supply power by the fan power switching unit (6), and the detection control unit (7) which stops the fan power switching control unit (5) when the overload is detected. Exhaust fan rotation speed control apparatus of a gas boiler comprising a). 2. The fan power supply unit (1) according to claim 1, wherein the fan power supply unit (1) includes a diode (D1-D4) for rectifying an input AC power supply, a capacitor (C1) (C2) (C16) and a choke coil (H1) for smoothing the rectified power supply. ) And a switching transistor TR1 for supplying and cutting off the rectified power, and the fan rotation speed control unit 2 switches the rotation speed control signal supplied from the microcomputer 3 with a reference level. A comparator A1 for outputting a signal and a transistor TR2 for turning on and off the transistor TR1 in accordance with the switching signal. The fan speed detection unit 4 inverts the fan rotation detection signal. Inverter G4 is supplied to the microcomputer 3, and the fan power switching control section 5 is configured to supply or cut off the inverter G1 for inverting the input fan rotation detection signal and the fan rotation detection signal. Supply the noah gate G2 and the inverted fan rotation detection signal, or Is composed of a NOA gate G3 for blocking control and a transistor TR7 (TR8) turned on / off by the output of the NOA gate G3 (G2), and the fan power supply switching unit 6 is the transistor. (TR7) An exhaust fan rotation speed control apparatus for a gas boiler composed of transistors (TR3) (TR6) and transistors (TR4) and (TR5) for securing a fan power supply path according to on / off of (TR8). The overload detection control unit (7) according to claim 2, wherein the overload detection control unit (7) includes a resistor (R20-R23) and a capacitor (C7) (C8) for detecting a power level supplied to the fan driving motor by the fan power switching control unit (6). And a resistor R24 (R25) for setting a reference voltage for overload detection, and a comparator A2 for outputting an overload detection switching signal by comparing the detected power supply level with a reference voltage. Control unit. A first process of calculating a load value of the current year from a value of detecting a power supply voltage and a fan rotation speed applied to the exhaust fan driving motor; and varying the duty ratio of the exhaust fan motor driving power supply voltage from the calculated load value. A method for controlling the exhaust fan rotation speed of a gas boiler comprising a second process of increasing or decreasing the rotation speed. ※ Note: The disclosure is based on the initial application.