KR100320740B1 - control device of exhaust pan for boiler - Google Patents

Abstract

The present invention relates to an exhaust fan control device for a boiler, the input terminal of the microcomputer 11 and the manual key input unit 20 for inputting a different rotation speed in accordance with the boiler capacity and rotation speed; The output unit 13 for outputting a load voltage in accordance with the exhaust fan rotation state of the motor driving voltage unit 25 is connected to the input terminal, the other input terminal from the output signal and the microcomputer 11 of the manual key input unit 20 A comparison amplifier 23 for simultaneously inputting and comparing output speed control signals and amplifying the output speed control signal to a driving voltage controller; A maximum output unit 40 connected to an output terminal of the microcomputer 11 so that the rotational speed of the exhaust fan of the motor driving unit 31 is maximized through the motor driving voltage unit 25; The output unit 13 is connected to the output terminal of the microcomputer 11 so as to generate an abnormal signal when the exhaust fan of the motor driving unit 31 is abnormal. It provides the effect of smoothing the combustion state of the boiler by driving.

Description

Control device of exhaust pan for boiler

The present invention relates to an exhaust fan control device for a boiler, and more particularly, in the electronic control device for detecting the rotational speed of the exhaust fan by capacity of the boiler and controlling the exhaust fan, the circuit for controlling the speed of the exhaust fan and maximum at startup. It is related with the exhaust fan control device for the boiler to configure the circuit to output the signal to drive the exhaust fan accurately and precisely according to the combustion state to facilitate the combustion state of the boiler.

The exhaust fan of the boiler is to discharge the burned gas to the outside through the boiler outlet.

Such a conventional conventional exhaust fan control device can be seen in the 'exhaust fan control circuit of Korean Patent Application Publication No. 96-7653', which allows the exhaust gas to be discharged at an appropriate amount of air without reducing the thermal efficiency even in an accident such as a reverse wind. As described above, the rectifying unit 1 rectifies the input power to DC, the constant voltage control unit 2 controlling the power from the rectifying unit 1 to supply the motor, and the hall sensor unit adjacent to the motor ( The logic gate part 6 which generates a logic signal based on the polarity sensing signal of 7), and the power supply from the said constant voltage control part 2 are input, and are alternately driven by the signal from the said logic gate part 6; When the motor driver 5, which is controlled to rotate the motor, the load detector 4 that detects the load of the motor driver 5, and the load detector 4 detects an overcurrent of the motor, When the logic gate unit 6 is controlled to cut off the current of the motor driving unit 5, and when the load detection unit 4 detects no load of the motor, the constant voltage control unit 2 is controlled to increase the load corresponding to the load. The regulating means 3 controls the voltage signal to be applied to the motor driving part 5.

In the conventional exhaust fan control circuit configured as described above, when an overcurrent flows to the motor driving unit 5, the exhaust fan control circuit detects this through the load detecting unit 4 and applies an output signal according to the overcurrent detection to the logic gate unit 6. 5) to prevent overcurrent from flowing through the motor drive unit 5, and when no load flows, a reverse wind blows through the communication, or a hose connected to the communication is bent so that a small current flows in the coil of the motor. By increasing the voltage of the load in the constant voltage controller 2 based on the load voltage of the motor driving unit 5 generated in the case of a loss, the increased speed of the motor signal is applied to the motor driving unit 5 to increase the rotational speed of the motor. It is designed to operate to make it work.

However, in the conventional exhaust fan control circuit, the rotational speed is applied by applying the charging voltage of the constant voltage controller to the motor driving unit so that the rotational speed is increased. Not only does not control the combustion capacity of the boiler and the amount of flue gas emissions and site conditions have a problem that can not be discharged to the outside smoothly in the combustion gas in the combustion cylinder.

In addition, in the conventional exhaust fan control circuit of the boiler, when the foreign matter is caught in the exhaust fan or rain water enters through the boiler communication, the exhaust gas is accumulated in the inner cylinder of the exhaust fan. Incomplete combustion occurs because it can not be discharged and the soot is burned in the boiler, the risk of fire occurs, even if there is a small gap of the boiler waste gas is introduced into the room has a problem that can have a fatal effect on human life.

Another conventional problem is a circuit for controlling the constant voltage control unit by releasing current when a counter current blows or when wild birds form a nest or a communication is bent. Even if it is completely blocked or the fan is disengaged from the fixed shaft of the motor and becomes in a no-load state where the normal combustion cannot be made, it can not be controlled, so it will continue to rotate.

In addition, the conventional exhaust fan control circuit cannot be controlled according to the number of revolutions of the boiler during ignition, so that the ignition is not performed properly. It has a problem of being controlled.

The present invention is intended to solve such problems in the related art, and an object thereof is to provide a circuit configuration and a capacity of a boiler and a maximum output of a motor at the initial start of the electronic control device for controlling the discharge fan. By arbitrarily adjusting the number of rotations according to the site conditions, the exhaust plate is driven accurately and precisely according to the combustion state so that the combustion state of the boiler can be smoothed. When the speed rises above a certain speed due to the overload of the fan or when the speed rises above a certain amount, the combustion stop signal is transmitted to the main controller of the boiler to stop the combustion. Can be controlled differently so that smooth ignition and combustion control can be achieved. There used to.

1 is a block diagram of a conventional exhaust fan control apparatus for a boiler.

2 is a circuit diagram of an exhaust fan control device according to an exemplary embodiment of the present invention.

Code descriptions for the main parts of the drawings

1,27; rectifier 2; constant voltage controller

3, control means 4, 22; load detection unit

5, 31; motor drive part 6; logic gate part

7,30; Hall sensor 10; Oscillator

11; microcomputer 12; power detection unit

13; output unit 20; manual key input unit

21; speed control unit 23; comparative amplifier

24; drive voltage control unit 25; motor drive voltage unit

26; power supply section 32; filter section

40; maximum output

Hereinafter, the technical configuration of the present invention with reference to the accompanying drawings in detail.

2 is a circuit diagram of an exhaust fan control device according to an exemplary embodiment of the present invention.

As shown in Figure 2 of the accompanying drawings, the rectifying unit 27 is connected to a plurality of diodes (D1 ~ D4) as a bridge diode to rectify the external AC power source to the DC power source, and the A power supply unit 26 for supplying an output signal at a constant voltage through the IC, and a resistor (R1) (R3) and a condenser to output a pulse frequency of a predetermined width through the power supplied from the power supply unit (26). C1) is connected to the emitter stage, and the collector stage is connected to the transistor (Q1) connecting the diode, coil, and capacitor, and the base of the transistor (Q1) to the emitter stage through a resistor, and the resistor (R9) is connected to the base stage. The motor driving voltage section 25 made up of the transistor Q2 is connected.

On the other hand, the oscillation unit 10 is connected to the crystal element (X1) so that a predetermined frequency is oscillated so that the rotation speed and the rotation speed of the exhaust fan by the power supply of the power supply unit 26, the resistor (R41), the condenser ( C18), a power detector 12 for connecting a diode D51 to detect a power supply state, an output unit 13 for outputting an abnormal state of a rotational speed as an electrical signal, and The output unit 13 and the power detecting unit 12 connect the microcomputer 11 to determine the combustion state through the program set therein by connecting the oscillating unit 10 to each input terminal and the output terminal.

In addition, an output 13 of the resistor R40 and the photo coupler PC1 is connected to an output terminal of the microcomputer 11 to output an abnormal occurrence of the rotation of the exhaust fan to the outside.

The input terminal of the microcomputer 11 has a manual key input unit 20 for finely adjusting the capacity and rotational speed of the boiler, and is connected to the output terminals of the manual key input unit 20 and the microcomputer 11 to the combustion of the boiler. A speed control unit 21 for outputting a different signal according to the present invention, a hall sensor unit 30 including a hall sensor IC20 and a condenser C201 to convert the magnetic poles and output an electrical signal, and the hall sensor A filter unit 32 connecting the diode D6 and the zener diode ZD1 in series and connecting the resistor R16 and the capacitor C10 in series so as to remove and output high frequency components of the output signal of the IC20; Resistor R13 to R15, R17, R18 and capacitor C11 connected to the output terminal of the filter unit 32 and the other output terminal of the microcomputer 11 and rotated by the output signal of the motor driving voltage unit 25. C13) Motor port connecting transistors Q3 to Q8 to exhaust fan motor M The connecting portion 31.

The motor driver 31 includes a plurality of resistors R20, R21, R22 and capacitor C14 connected in series to each emitter terminal of the transistors Q7 and Q8 to detect the load voltage of the exhaust fan motor. C15) (C16) is connected and the other end of the load detector 22 is made by connecting a resistor (R19).

The other output terminal of the microcomputer 11 connects the resistor R26 to the base terminal and converts the resistor R27 to the collector terminal so that the rotational speed of the exhaust fan motor of the motor driving unit 31 can be converted through the output signal. A transistor Q9 for connecting to the passive input unit and the speed control unit 21 for connecting the resistors R23, R24 and R25 in series so as to divide the output signal of the passive input unit to control the rotational speed of the exhaust fan motor. Connect it.

The manual input unit connected to the input terminal of the microcomputer 11 is connected in parallel so that the input signals of the switch SW1 to which the plurality of input keys are connected can be output to the microcomputer 11 and the speed controller 21 to each input / output terminal. It is connected in parallel to the input terminals of the diodes (D11 ~ D14) connected to the resistors (R32 ~ R35), connected to the diode (D7 ~ 10) connected to the resistors (R28 ~ R31) to each output terminal and in parallel to the output of the switch It has a configuration made by connecting so as to output the input signal via the connected resistor (R37 ~ R39).

The collector terminal of the transistor Q9 of the speed controller 21 is connected to receive a signal output through the resistors R37 to R39 of the passive input unit.

The output signal of the speed controller 21 and the output signal of the load detector 22 may be inputted so that the output signal of the speed control unit may be input to the inverting input terminal of the comparator OP1 and the load may be input to the non-inverting input terminal. Connect the resistor R22 of the detector 22 and connect the capacitor resistor to the non-inverting input terminal and the output terminal so as to detect the motor rotational speed of the exhaust fan, connect the resistor R11 to the inverting input terminal and the output terminal, and connect the resistance ( It has a configuration made by connecting the comparative amplifier 23 made by connecting R10).

The output terminal of the comparison amplifier 23 outputs a driving voltage to the motor of the exhaust fan through the compared speed control signal and the load signal of the exhaust fan to the output terminal of the comparison amplifier 23 so that the rotation speed or the rotation speed can be controlled. The signal is input to the non-inverting input terminal, the capacitor is connected to the non-inverting input terminal and the output terminal, and the resistor R5 and the resistor R6 are respectively connected to the output terminal of the motor driving voltage section 25 at the inverting input terminal and the resistor R5 ( A capacitor and a resistor capacitor are respectively connected to R6), and an output terminal constitutes a driving voltage control unit 24 including a comparator OP2 for connecting to the base terminal of the transistor Q2 of the voltage unit of the motor driving unit 31.

In addition, the microcomputer 11 has a maximum output connected to the base terminal of the transistor Q2 of the motor driving voltage unit 25 through the resistor R42 at the output terminal so that the exhaust fan can instantly rotate at high speed by obtaining the maximum output. The part 40 is comprised.

Referring to the effects of the present invention configured in this way in detail as follows.

The present invention is to control the speed of the exhaust fan of the boiler, as shown in Figure 2 is to operate the combustion gas generated while starting to operate the boiler by rotating the exhaust fan. Here, in the operation control of the exhaust fan, the microcomputer 11 initializes a program set therein with the power applied from the power detection unit 12 and determines whether there is an input signal from the outside.

The microcomputer 11 reads the rotation speed of the exhaust fan input from the manual key input unit 20 and outputs a control signal to enable the motor rotation according to the rotation speed of the exhaust fan read in the motor driving unit 31.

Here, the manual key input unit 20 allows the rotation speeds of different exhaust fan motors to be set when a plurality of input keys are set by the user. When each switch is input, the diodes D11 to D14 of the output terminal of each switch and The resistors R32 to R36 are converted to appropriate voltage levels in the course of the current flow, so that voltage levels corresponding to different rotational speeds are output to the microcomputer 11.

At this time, the motor driving unit 31 inputs the output signal of the rotational speed of the exhaust fan read from the manual key input unit 20 by the microcomputer 11 through the resistor R16, the capacitor C11, and the resistor R14 to output the resistor ( The signal input at R17 causes the transistors Q3, Q5 and Q8 to switch and the signal input at resistor R14 causes the transistors Q4, Q7 and Q6 to switch.

When the exhaust fan motor of the motor driver 31 is driven, the operation state of the exhaust fan motor is output to the load detector 22 connected to the emitter terminals of the transistor Q6 and the transistor Q8 of the motor driver 31. In addition, the hall sensor unit 30 of the input terminal of the motor driving unit 31 detects the operation state of the exhaust fan motor and outputs the signal detected by the microcomputer 11 through the filter unit 32.

At this time, the load detector 22 converts the exhaust fan motor output voltage AC component of the motor driving unit 31 into a stable DC component through the resistors R19 to R22 and the capacitors C14 to C16 to the comparative amplifier 23. The exhaust fan motor outputs the load state generated while the motor rotates.

On the other hand, the comparison amplifier 23 inputs a signal output from the load detector 22 to the non-inverting input terminal of the comparison element IC3A, and the fine adjustment switch SW5 of the manual key input unit 20 to the inverting input terminal. SW6) (SW7) allows the output signal to be input via resistors R37, R38 and R39.

Here, the comparison amplifier 23 simultaneously inputs the control speed signal of the exhaust fan motor output from the microcomputer 11 to the other input terminal of the inverting input terminal through the speed controller 21 simultaneously with the fine adjustment signal of the manual key input unit 20. To be compared.

At this time, the speed controller 21 switches the control speed signal of the exhaust fan motor M output from the microcomputer 11 and switches the transistor Q9 through the resistor R26 to switch SW1 to the manual key input unit 20. Combined with the output signal of SW4) to output to the inverting input terminal of the comparator (IC3A) of the comparison amplifier 23, and at the same time to input a reference voltage so that a constant voltage falls through the resistor (R25) from the resistor (R23) The output signals of the resistors R28 to R31 of the passive key input unit 20 are combined and output to the comparison element inverting input terminal of the comparison amplifier 23.

The comparison amplifier 23 inputs the output signal of the speed controller 21 coupled with the output signal of the manual key input unit 20 to the inverting input terminal through the comparison element, and compares the output signal of the load control unit to the inverting input terminal. After the differential amplification is output to the driving voltage control unit 24 through the resistor (R10).

The driving voltage control unit 24 inputs the comparison signal output from the comparison amplifier 23 to the non-inverting input terminal, and the inverting input terminal inputs the output signal of the motor driving voltage unit 25 through the internal comparator IC3B. The rotation speed signal of the controlled exhaust fan is output again to the motor driving voltage unit 25.

Here, the driving voltage controller 24 combines the values through the resistors R6, R7, and R8 and the pulse signals through the resistor R5 and the capacitor C5 to convert the smooth signal to the capacitor C8. The signal inputted through and output from the comparison amplifier 23 is inputted as a non-inverted signal for comparison control.

The motor driving voltage unit 25 receives the power supplied from the current unit and the power supply unit 26 to perform signal processing to apply a voltage for operating the motor M of the exhaust fan. In this case, the transistor Q1 is applied. And the reference voltage output by the switching operation of the transistor Q2 is applied to the exhaust fan motor (M).

In addition, the motor driving voltage unit 25 may include a resistor R5 and a capacitor C5 of the driving voltage control unit 24 connected to the output terminal so that a pulse width modulation signal may be applied to the motor M of the exhaust fan. After the frequency control through (C8) is to supply to the motor drive unit 31 from the output of the coil (L1).

Here, the motor driving voltage unit 25 connects the resistor R42 of the maximum output unit 40 to the base terminal of the transistor Q2 so as to input the maximum output signal from the microcomputer 11 to the microcomputer 11. By inputting the maximum output signal output from the motor output section so that the exhaust fan motor of the motor drive unit 31 to rotate at the maximum speed.

The rectifier 27 and the power supply 26 constitute a normal circuit, and the rectifier 27 rectifies and controls the AC power through the bridge diode BZ and outputs it to the motor driving voltage unit 25. A constant voltage may be supplied to the microcomputer 11 through 26.

On the other hand, the microcomputer 11 inputs the abnormal signal of the exhaust fan detected by the hall sensor through the filter unit 32 when the rotation state of the exhaust fan of the motor driving unit 31 is abnormal, and output unit 13. Through the photo coupler (PC1) of the exhaust fan abnormal signal to notify the external control device foreign matter is caught around the exhaust fan or the abnormality of the peripheral device of the exhaust fan.

The present invention acting as described above connects the speed control unit and the maximum output unit to the microcomputer so that the rotational speed of the exhaust fan input through the manual key input unit 20 can be properly rotated according to the capacity of the boiler. The exhaust fan can be rotated according to the rotation speed of the exhaust fan read through the manual key input unit, and the maximum output unit allows the microcomputer to rotate the rotation speed of the exhaust fan to the maximum speed and exhaust the exhaust fan. It prevents the rotation stop by foreign matters around the fan and if the abnormality occurs in the exhaust fan's rotation state, the abnormal signal can be notified to the external control device through the output of the microcomputer to prevent the abnormality of the fan's exhaust fan rotation state. It has the effect of preventing it in advance.

Claims (5)

The hall sensor unit 30 is connected to an input terminal of the motor driving unit 31 mounted on the exhaust fan motor to be rotated through an external control signal, the hall sensor unit 30 having a hall sensor detecting a motor state of the exhaust fan. The filter unit 32 converts the output signal of the hall sensor into an appropriate signal to the microcomputer 11 and outputs the same, and controls the rotational state of the exhaust fan of the motor driving unit 31 and the rotation speed output from the microcomputer 11. The load detection unit 22, the driving voltage control unit 24, and the motor driving voltage unit 25 are connected to compare the signals to control the occurrence of abnormality, and are fixed to the motor driving voltage unit 25 and the microcomputer 11. In the boiler that connects the rectifier 27 and the power supply 26 so that the voltage can be supplied, and the oscillator 10 and the power detection unit 12 so that the normal operation can be made to the microcomputer 11, The input terminal of the microcomputer 11 has a manual key input unit 20 for inputting different rotational speeds according to the capacity and the rotational speed of the boiler; The output unit 13 for outputting a load voltage according to the exhaust fan rotation state of the motor driving unit 31 is connected to an input terminal, and the other input terminal outputs the output signal of the manual key input unit 20 and the microcomputer 11. A comparison amplifier 23 which inputs and compares the signals of the speed controller 21 at the same time and amplifies and outputs the signals to the driving voltage controller; A maximum output unit 40 connected to an output terminal of the microcomputer 11 so that the rotational speed of the exhaust fan of the motor driving unit 31 is maximized through the motor driving voltage unit 25; Exhaust fan control apparatus for the boiler is connected to the output terminal of the microcomputer 11 is connected to the output unit 13 for generating an abnormal signal when the rotation state of the exhaust fan of the motor drive unit 31 is abnormal. The manual key input unit 20 connected to the input terminal of the microcomputer 11 sends input signals of the switches SW1 to SW7 to which the plurality of input keys are connected to the microcomputer 11 and the speed controller 21. Diodes (D7 ~) connected in parallel to the input terminals of diodes (D11 ~ D14) connected in parallel to each other and connected with resistors (R32 ~ R35) connected in parallel to connect outputs (R28 ~ R31). 10) connected to the output terminal of the switch exhaust fan control device for the boiler, characterized in that the connection is made so as to output the input signal via a resistor (R37 ~ R39) connected in parallel. According to claim 1, wherein the comparison amplifier 23 inputs the output signal of the speed control unit 21 and the output signal of the load detector 22 to compare the signal to the inverting input terminal of the comparator (OP1) speed control unit ( The output signal of 21) can be inputted, and the resistor R22 of the load detector 22 is connected to the non-inverting input terminal, and the capacitor C9 and the resistor R12 are connected to the non-inverting input terminal and the output terminal, and inverted. A resistor (R11) is connected to the input terminal and the output terminal, the exhaust fan control device for a boiler, characterized in that the output is made of a resistor (R10) is connected. According to claim 1, wherein the output terminal of the microcomputer 11 is connected to the output unit 13 made of a resistor (R40) and a photo coupler (PC1) to further output the abnormal occurrence of the rotation of the exhaust fan. An exhaust fan control device for a boiler. The base terminal of the transistor (Q2) of the motor driving voltage unit 25 via the resistor (R42) at the output terminal so that the exhaust fan is instantaneously obtains the maximum output and rotates at high speed. Exhaust fan control device for a boiler, characterized in that the maximum output unit 40 is connected to further made.