KR900000926Y1 - Combustion auto-control circuit for combustion apparatus - Google Patents

Abstract

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Description

Combustion automatic control circuit of combustion equipment

1 is a circuit diagram of the present invention.

2 is the initial combustion and burnout phase.

3 is a square wave conversion waveform diagram of an AC power sine wave.

4 is a driving pulse diagram of the electronic pump.

* Explanation of symbols for main parts of the drawings

1: Micom 2: Combustion air flow motor control circuit

3: electronic pump flow control circuit part 4: combustion state comparison control circuit part

5: voltage amplification circuit section 6: attenuator control circuit

7: wind pressure comparison control circuit portion 8: square wave generation circuit portion

MO: Motor for air flow oxygen EP: Electronic pump (for oil supply)

CDS: Flame Detector IG: Igniter

LX: Wind Pressure Sensor VCC: DC Power

The present invention relates to a combustion automatic control circuit of a combustion device capable of maintaining an optimal combustion state by detecting a combustion state with light during the burner operation of the combustion device and processing it in three stages according to the combustion state.

Conventionally, the combustion method of a large and medium combustion device is a method of supplying oxygen to a fan while supplying oil by simply operating an oil pump to a burner, and igniting it by igniter (ignitor) for a predetermined time. It was a lot of problems such as excessive consumption of oil, thermal efficiency drop, harmful gas field life.

The present invention is to solve this problem by using a flame sensor and pressure (wind pressure) sensor to determine the combustion phase of the combustor oxygen supply motor. The purpose of the present invention is to provide an automatic combustion control circuit for a combustion device that can control the oil supply electronic pump and the igniter circuit to prevent burner overheating and improve the annual efficiency by a complete combustion state. .

The present invention is a microcomputer (1) for processing a variety of data inputs to control each drive unit and processing a signal, and a combustion air volume motor control circuit unit (2) to supply oxygen to the combustion burner by the control signal and the microcomputer (1) control signal; An electric pump flow rate control circuit part 3 driven by the control signal of the microcomputer 1 to supply oil to the burner, and a voltage amplification circuit part 5 which detects the flame state of the burner and outputs a combustion state detection voltage; . And a combustion state comparison chair circuit portion (4) for comparing the output voltages of the voltage amplification circuit portion (5) to apply a signal voltage for determining the combustion state to the microcomputer (1). An igniter control circuit section 6 for controlling the driving of the igniter with the output of the drive chair of the microcomputer 1; Wind pressure comparison control circuit unit 7 for detecting the air volume for combustion to apply the air volume detection signal voltage to the microcomputer 1, and a square wave regeneration unit 8 for converting AC power into a square wave to apply to the microcomputer 1 .

Each circuit component in the present invention of such a configuration will be described in detail.

Each input / output terminal of the microcomputer 1 which processes various input data to control each drive unit and processes signals has the best combustion air flow rate motor control output terminal P ₁ (P ₂ ) and electromagnetic pump control output terminal P ₃ . An input terminal (P ₄ ) to which state data is input is composed of an input terminal (P ₅ ) to which intermediate combustion state data is applied, and an input terminal (P ₆ ) to which incomplete combustion state data is applied, and an igniter which controls combustion ignition of the burner. It consists of a control output terminal (P ₇ ), a minimum combustion air volume signal input terminal (P ₈ ) and a maximum combustion air volume signal input terminal (P ₉ ) to which data signals processed by wind pressure sensing the oxygen supply state at the time of combustion are inputted Square wave conversion signal input terminal P ₁₀ for converting and inputting power into a square wave.

And the combustion air flow the motor control circuit part (2) is the output terminal of the microcomputer (1) (P ₁₎ (P _2), the output resistance (R ₁₎ (R ₂₎ (R ₃₎ (R ₄₎ coming through the transistor (Q ₁ ) the collector side of the relay of the (Q ₂₎ is to be connected to the base, and the transistor (Q ₁₎ (Q ₂₎ of the (RY ₁₎ (connecting RY ₂₎ and a diode to remove the abnormal voltage generated during the relay operation (D ₁ ) (after configuring the D ₂₎ the relay (RY ₁₎ (semi-glossy diode indicating the operations relative _{RY 2) (LED 2) (} LED 4) and a driving resistor (R ₅₎ relay, composed of (R ₆₎ ( gale to the contact end of the RY ₁₎ (Hm) and stroke (Nhn) the contact end of the selected combustion air amount supplied to the motor (NlO) is connected in the configuration, and the relay (RY ₂₎ for Mild Wind (Lm) is presented to the combustion air flow selection The rotation of the supply motor (mo) is strong wind in accordance with the output of the output terminal (P ₁ ) (P ₂ ) of the microcomputer (1). Stroke. Configured to control by light wind.

The solenoid pump flow rate control circuit part 3 has a nose of the relay RY ₃ to the collector of the transistor Q _{1 to} which the output terminal P ₃ of the microcomputer 1 is applied through the resistors R ₇ and R ₈ . After connecting one end and the diode (D ₅ ) that removes the abnormal voltage generated during the relay operation to both ends of the relay coil, and then the light emitting diode (LED ₆ ) indicating the operating state of the relay (RY ₃ ) and the driving resistor (R) ₉ ) is connected in series and the electronic pump (EP) is connected to the contact point of the relay (RY ₃ ) so that the driving of the electronic pump (EP) is controlled by the output of the output terminal (P ₃ ) of the microcomputer (1). A half-wave rectifying diode D ₇ is connected to both ends of the pump EP.

Also. The voltage amplification circuit part 5 connects the resistors R ₁₇ and R _{18 in} parallel and parallel to the flame detection sensor CDS for detecting the flame state of the burner, and the flame detection sensor to the OP amplifier OP ₅ used as a buffer. The output of the (CDS) is configured to be applied and the output of the OP amplifier (OP ₅ ) is connected to the flame state detected by the flame detection sensor (CDS) through the OP amplifier (OP ₄ ) to which the resistors R ₁₅ and R ₁₆ are connected. After amplifying the fine voltage according to the configuration, the output voltage is configured to be connected to one terminal (+) of the OP amplifiers OP _{1 to} OP ₃ of the combustion state comparison control circuit 4.

In addition, a reference voltage setting resistor (R ₁₀ ) (R ₁₁ ) (R ₁₂ ) (R ₁₃ ) is connected to the other terminal (-) of the OP amplifiers OP _1- OP ₃ of the combustion comparison control circuit section 4. The output is configured so that data is input through the input terminals P ₄ (P ₅ ) (P ₆ ) of the microcomputer 1 and the input terminal P ₄ (P ₅ ) (P ₆ ) is applied from the microcomputer 1. The igniter control circuit unit 6 outputs the output terminal P ₇ of the microcomputer 1 to drive the transistor Q ₄ through the resistors R ₁₉ and R ₂₀ . Light emitting diode (LED) which is configured to control but connects the relay coil terminal to the collector of transistor (Q ₄ ) and connects the diode (D ₉ ) to remove the abnormal voltage generated during relay operation at both ends of the relay coil. ₈ ) and the resistor R ₂₁ are connected.

In addition, the wind pressure comparison control circuit 7 detects the wind volume of the combustion fan by wind pressure sensor LX, and connects the detected voltage to one terminal (+) of the OP amplifier OP ₆ (○ P ₇ ). After connecting the reference voltage setting resistor (R ₂₂ ) (R ₂₃ ) (R ₂₄ ) to the other terminal (-), the data of the combustion air flow state is input through the input terminal (P ₉ ) (P ₁₀ ) of the microcomputer (1). Configure to be entered.

And the AC power source (AC) input of the square wave half life circuit 8 is then connected to the base-side resistor (R2 ₂₅₎ (R ₂₆₎ and the collector-side resistor (R ₂₇₎ to the transistor (Q ₅₎ the microprocessor (1) Using Connected to the terminal (P ₁₀ ) is configured to generate a square wave pulse at the O point of the AC power supply.

Thus configured "H level" at the output terminal (P ₁₎ of the microcomputer (1) for the recognition time (TA), such as when the subject innovation initial combustion function in the function selection unit is not displayed selection operation the combustion in the in the second Fig. When the transistor Q ₁ is turned on by outputting the output signal, the contact of the relay RY ₁ is contacted by the strong wind Hm to operate the motor for supplying the airflow oxygen in the strong wind to remove burners. After the predetermined time TA, the igniter drive output terminal P ₇ of the microcomputer 1 outputs an "H level" output for the set time TB as shown in FIG. 2 to turn on the transistor Q ₄ . Since the contact of the contactor relay RY ₄ is connected, the operation display light-emitting diode LED ₈ turns on to indicate the connection state of the relay RY ₁ and simultaneously drives the burner TG to ignite the burner. From the operating time of the igniter to the same stall time as in Figure 2 After that, the transistor Q ₃ is turned on by outputting an “H level” signal to the EP supply terminal P ₃ for oil supply of the microcomputer 1. The contact of the relay RY ₃ is connected, the relay operation indicator light-emitting diode LED ₆ is turned on to indicate the operation state, and then the electronic pump EP is driven to supply oil to the burner, to ignite, and to start combustion.

In addition, the motor (MO) for supplying the coral (air volume) maintains a strong wind state for a set time (TD) after the IG is operated for a predetermined time (TB) as shown in FIG. The light emitting diode LED ₄ 4 is turned on by turning on the transistor Q _{2 with} the strong wind output terminal P ₁ of the microcomputer 1 in the "L level" state and the weak wind output terminal P ₂ with the "H level". japsok to the point of contact at the same time the relay (RY ₂₎ for lighting the air volume hayeoseo coral supply the motor (MO) for the to be Mild Wind (LM) to supply oxygen to the burner.

In this way, when the combustion device is operated and the room temperature rises, the room temperature is sensed by an undisplayed room temperature sensor, and the combustion is stopped when the room temperature is maintained. At this time, when the combustion is stopped, the microcomputer (1) Output terminal (P ₃ ) of the output to the "L level" to cut off the electronic pump (EP), after the pendulum pump (EP) is cut off the output terminal (P ₂ ) of the microcomputer (1) for a certain time (TE). `` L level ''. The output terminal P ₁ is output at the "H level" to switch the oxygen supply motor MO from the mild wind to the strong wind to drive the motor M0 so that the gas generated by the incomplete combustion is released and then shut off.

In other words, in the initial stage of combustion, when the carding state is burned, as shown in FIG. 2, the motor for supplying the air volume oxygen (MO) is rotated with a strong wind for TA time to remove the grease inside the burner, and the igniter lG is operated for TB time. After operation, it is delayed for TC time until the EP pump is operated, and after the igniter (lG) is turned off, the air flow oxygen feeding motor (MO) is rotated in a strong wind for the TD time for complete combustion. After “off”, the motor for supplying the air volume oxygen (MO) is rotated in a strong wind for TE time to release the gas generated by incomplete combustion.

The voltage medium circuit 5 detects a flame state by a combustion flame detector (CDS) attached to the inside of the combustor, changes the voltage to a voltage through the OP amplifier OP ₅ , and then amplifies it in the ○ P amplifier OP ₄ . The output is input to the combustion state comparison control circuit section 4 and compared with the reference voltage level distributed by the resistors R ₁₀ (R ₁₁ ) (R ₁₂ ) (P ₁₃ ) to the input terminal P ₄ of the microcomputer 1. (P ₅ ) (P ₆ ) inputs to the input terminals (P ₄ ) (P ₅ ) (P ₆ ) of the microcomputer 1 due to the low interleaver amplification voltage of the voltage longitudinal circuit section 5 during incomplete combustion. L level "." L. Level "," L. level "signal (OOO) or" L level "," L level "," H level "signals (O, O, 1) are input to the microcomputer incomplete combustion state (1), when it is in a proper combustion state, the sense amplification voltage of the voltage amplifying circuit section 5 is increased ("L level", "H level", "H level" signals (0.1, 1) and the microcomputer (1). ) And write it to Micom It recognized that the combustion sikimyeo complete combustion when the state is "H level", the amplified voltage of the voltage amplifying circuit 5 is higher than the reference voltage by a resistor (R ₁₀ -R _13), "H level" state, "H ryebel" Since the signal 1.1.1 is input to the microcomputer 1 as a data signal, the microcomputer 1 recognizes the complete combustion state.

In other words, the combustion state of the combustor is incomplete. proper. According to the complete combustion state, different voltages are applied to the input terminals P ₄ , P ₅ and R 6 of the microcomputer 1 to detect the combustion state in the microcomputer 1.

In addition, the wind generated by the motor for supplying the air volume oxygen (M0) converts the air volume into the sensed voltage by the wind pressure sensor (LX), so that the wind pressure comparison control circuit unit (7) provides the proper wind pressure (Lℓ) and the maximum wind pressure (Hℓ). Are compared and input to the microcomputer 1.

At this time, if the proper wind pressure (Lℓ) generated in the motor for supplying air flow oxygen does not reach the "H level", the igniter (igniter) (lG). The electromagnetic pump (EP) does not operate, and the combustion function is kept in the shut-off state, so that the optimum combustion pressure (Lℓ) becomes "H level", and the combustion operation is performed only when the maximum wind pressure (Hℓ) becomes "H level". Data is inputted into the microcomputer 1 with the air volume of.

In addition, referring to FIG. 3, the electromagnetic pump (EP) driving partner shows that when the AC power waveform (-) is applied to the base type side of the transistor Q ₅ of the square wave generation circuit unit 8 using the waveform of the AC power source AC. (1) an input terminal (P ₁₀₎ is "H level" square wave pulse to be input to and the point of the AC waveform that is zero. The point A of FIG. 3 is subjected to data processing by the microcomputer 1.

In other words. In FIG. 4, the electronic pump EP determines the timing of FIG. 3 at the time of output of the electronic pump control terminal P _P of the microcomputer 1, and after χTG + TF from the point A, (χ: constant) ) The output terminal (P ₇ ) is set to the "H level" so that the "H level" period is indicated by T _H as shown in the electronic pump driving pulse shown in FIG. T _I. T _J (T _H > T _I > T _J ) and the "L level" period becomes T _K .T _L, T _M (T _K > T _L > T _M ) to interrupt the "on-off" .

At this time, when the output terminal P ₇ of the microcomputer 1 becomes "H level", as shown in FIG. 4, the AC waveform is input to the electromagnetic pump, and the half-wave rectification is performed by the half-wave rectifying diode D ₇ . Since the electronic pump (EP) is operated.

As described above, the present invention operates according to the time delay pulse input of FIG. 2 at the beginning of combustion, and when the combustion is in progress, the microcomputer 1 of the microcomputer 1 is in the best combustion state according to the data signal of the combustion state comparison control circuit part 4. The "H level", "H level", and "H level" signals (1.1.1) are inputted to the input terminals P ₄ , P ₅ , and P ₆ to the air flow coral supply motor after data processing. The control entry terminal P ₁ is "L level". The output terminal (P ₂ ) is set to "H level" so that the motor enters a mild wind, and the oil supply electromagnetic pump (EP) has a driving cycle of T (H level) as shown in FIG. The flow rate and air flow should be chaired to be plate combustion by driving at T, (T level) to supply oil.

Also. If the combustion state is an appropriate combustion state MC, the output terminal P ₂ of the Comicum 1 remains in the "H level" state and the electronic pump drive of the output terminal P ₃ is driven as shown in FIG. The period is set to T (H level) and T (L level) to increase the oil supply to burn, so as to be the best combustion partner.

In the incomplete combustion state LC, the combustion air supply motor MO is set to strong wind, that is, the output terminal P ₁ is set to "H level", and the driving period of the electronic pump EP is set to T (Fig. 4). H level). It is controlled by T (L level) to increase the air flow rate and flow rate so as to be in plate combustion.

In this way, the flame detection sensor CDS determines the combustion state HC, MC and IC to automatically control the combustion air supply motor MO and the electronic pump EP by the microcomputer 1 as described above. It will maintain the best combustion state with minimum flow rate and negative air flow.

As described above, the present invention detects the combustion state with light when the burner of the combustion device operates, and processes the combustion state in three stages so that the coral supply motor (MO) and the oil supply electronic pump (EP) are properly applied. By driving the combustion state at all times to produce the best efficiency to reduce the annual efficiency due to incomplete combustion harmful gas generated by the excessive supply of oil to prevent the waste of power due to overheating and unnecessary motor operation.

Claims (1)

Combustion wind amount motor control circuit part 2 for controlling the oxygen supply in the combustion device by the strong wind and weak wind operation control of the motor (MO) for supplying air flow oxygen, and the oil supply of the combustion device by the drive control of the electromagnetic pump (EP) With electronic pump flow control circuit section (3). A voltage amplification circuit unit 5 which detects and amplifies the combustion state of the combustion device with a flame detection sensor CDS, and a combustion which outputs a combustion state control signal by comparing the flame detection voltage of the voltage amplification circuit unit 5 with a reference voltage; The state comparison control circuit section 4, the igniter control circuit section 6 for controlling the bagging operation of the igniter lG, and the wind pressure comparison control circuit section for detecting the combustion air flow rate by the wind pressure sensor LX and supplying a combustion air flow state signal. (7), a square wave generator circuit portion 8 for generating square waves using an AC power source, and the square wave generator circuit portion 8; The wind pressure comparison control circuit 7 and the combustion state comparison control circuit section 4 process the state signal data, and the combustion air volume motor control circuit section 2 and the electronic pump flow rate control circuit section 3 are processed. An automatic combustion control circuit for a combustion device composed of a microcomputer (1) for outputting a drive control signal of the igniter control circuit section (6).