CN102981532B - Electric heating control circuit for air resistance furnace - Google Patents
Electric heating control circuit for air resistance furnace Download PDFInfo
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- CN102981532B CN102981532B CN201210487880.0A CN201210487880A CN102981532B CN 102981532 B CN102981532 B CN 102981532B CN 201210487880 A CN201210487880 A CN 201210487880A CN 102981532 B CN102981532 B CN 102981532B
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Abstract
The invention discloses an electric heating control circuit for an air resistance furnace. The electric heating control circuit is composed of four stage heating control circuits, a main switch and a main control circuit. In the four stage heating control circuits, a first stage heating control circuit is used for controlling an air preheating section of the air resistance furnace, and a controlled electric heating element is arranged at the front end of the air resistance furnace and close to an air inlet; an electric heating element controlled by a fourth stage heating control circuit is arranged at the position close to an air outlet; and electric heating elements controlled by second and third stage heating control circuits are arranged between the first stage heating control circuit and the fourth stage heating control circuit. An external alternating current power supply is accessed through the main switch, and the four stage heating control circuits are arranged at the lower end of the main switch; and the four stage heating control circuits are connected with the main control circuit which sends drive signals and temperature setting signals to control the four stage heating control circuits.
Description
Technical field
The present invention relates to a kind of heating control circuit for air resistance furnace.
Background technology
At present, the heating electrical appliance such as dry cleaner, electric heater, electric oven and electric heating water heater or equipment conventionally adopt resistance wire or Elema to carry out electrical heating and realize heating function.Air resistance furnace is to utilize electricity for energy input heating environment air is to obtain the electric heater unit of high temperature air, can be used as the temperature air-source in scientific experiment and industrial processes.Because the heat transfer property of air is poor, need to effectively protect and realize accurate control to electrical heating elements.How to obtain the heat energy that is converted into air of electric energy highly effective and safe, heater circuit reasonable in design is crucial.Existing heating control circuit mainly adopts the mode of silicon-controlled voltage regulation to adjust heating power, major defect is controllable silicon in the time adjusting conduction angle, to the strong high frequency interference of outside power generation, and can not zero cross fired, power stage can not be started from scratch, and output power is also very little.Air resistance furnace needs larger electrical heating power conventionally, can realize from zero energy and regulate to meet the adjusting to air themperature, and silicon-controlled voltage regulation mode cannot be applied.
Summary of the invention
The object of the invention is to overcome existing electric heater unit external power source is disturbed to larger shortcoming, propose a kind of high-power heating control circuit, it is adjustable continuously that the present invention can realize output power, and adjustment process is disturbed little to external power source.
The present invention adopts servomotor to combine with electric voltage regulator and uses and carries out voltage-regulation, carry out power adjustment in conjunction with the operational amplifier in total control circuit, the driven by servomotor signal that the computing machine in total control circuit sends is exported to servomotor by operational amplifier.The adjustment of can starting from scratch of the output voltage of driven by servomotor electric voltage regulator, output waveform is complete sine wave, and whole circuit is not had to high frequency interference, can realize larger output power.
Technical solution of the present invention is as follows:
The heating control circuit that the present invention adopts level Four independently to control and regulate, can realize the continuous adjusting to four heating region input electric powers in air resistance furnace.
First order heating control circuit is for controlling the preheating of air section of air resistance furnace, control to add thermoelectric element be the serviceability temperatures such as resistance wire lower than the electrical heating resistance material of 600 DEG C, air is heated to preset temperature in this bringing-up section from room temperature, be characterized in that the working temperature of air and electrical heating elements is lower than 600 DEG C, but required electrical heating power is larger.The second level, the third level and fourth stage heating control circuit adopt identical control loop, its heating power can be the same or different, the heating element of controlling is high temperature resistant, oxidation resistant Elema etc., and the working temperature of air and electrical heating elements is 600 DEG C-1200 DEG C.
According to air-flow direction, the electrical heating elements that first order heating control circuit is controlled is positioned at the front end of air resistance furnace, near the entrance of air, flow through the successively electrical heating elements of the second level, the third level and the control of fourth stage heating control circuit of air after the electrical heating elements that the first order of flowing through heating control circuit is controlled, the electrical heating elements that fourth stage heating control circuit is controlled is near air out.Level Four heating control circuit is realized the independent regulation of four heating region input electric powers, can realize regulating in relative broad range of air resistance furnace outlet air temperature, the user's that is content with very little various temperature demand.
Electrical-heating control circuit of the present invention is by level Four heating control circuit, master switch and master control the electric circuit constitute.External ac power source accesses by master switch, and level Four heating control circuit is connected on the lower end of master switch, when level Four heating control circuit after master switch closure is connected external ac power source.Level Four heating control circuit is connected with total control circuit by shielded cable, data line, is sent driving signal and the temperature setting signal of the servomotor of level Four heating control circuit by total control circuit.Every grade of heating control circuit includes switch, temperature controller, electric voltage regulator, servomotor, electrical heating elements, current protective relay, current transformer, and current protector.Four heating control circuits share an AC power master switch and a total control circuit.Total control circuit is control axis of the present invention, and all manipulation signals to level Four heating control circuit send by total control circuit.Total control circuit is connected by data line with servomotor, and total control circuit is connected by shielded cable with temperature controller.
In every grade of heating control circuit, depending on the size of the required heating power of air resistance furnace, its electric voltage regulator can be two-phase electric voltage regulator or three-phase electric pressure regulator.Because air resistance furnace needs larger heating power conventionally, the electrical heating elements that especially first order heating control circuit is controlled is resistance wire, needs very large electrical heating power, and the electric voltage regulator adopting mostly is three-phase electric pressure regulator.The electrical heating elements that the second level, the third level and fourth stage heating control circuit are controlled is Elema, and the visual power demand of electric voltage regulator adopting is selected three-phase regulator or two phase voltage regulators.Described temperature controller is from thermopair Real-time Obtaining temperature signal in air resistance furnace, the converter of temperature signal in temperature controller is converted to voltage signal, in this voltage signal and temperature controller, preset value compares, send according to the steering logic of setting the instruction of whether adjusting voltage, realize temperature feedback control.In the time recording temperature higher than setting value, temperature controller sends instruction thermorelay is disconnected, and stops the heating in this region.In the time recording temperature and drop to setting value, temperature controller sends instruction and makes thermorelay closure, starts to heat in this region.The use of temperature controller, has realized the safe heating of air resistance furnace, can effectively protect electrical heating elements.
The output power of electrical-heating control circuit provided by the invention is to realize continuously adjustablely by the computing machine in total control circuit and operational amplifier control driven by servomotor electric voltage regulator, and power regulating range is large.Input to by total control circuit thermocouple signal that the temperature setting signal of temperature controller and temperature controller accept and compare to control temperature; can effectively protect heating element; antijamming capability is strong; the output power causing when can auto-compensation voltage ripple of power network excessive is unstable, thereby keeps the output power of power supply to remain unchanged at set-point.
Brief description of the drawings
The schematic diagram of Fig. 1 electrical-heating control circuit embodiment 1 of the present invention;
The schematic diagram of Fig. 2 electrical-heating control circuit embodiment 2 of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Electrical-heating control circuit of the present invention is made up of level Four heating control circuit, master switch K and total control circuit.Every grade of heating control circuit is by switch, power light, temperature controller, electric voltage regulator, servomotor, electrical heating elements, current protective relay, current transformer, and the composition such as current protector.
Figure 1 shows that the embodiment 1 of electrical-heating control circuit of the present invention.Embodiment 1 is made up of level Four heating control circuit, master switch K and total control circuit.Every grade of heating control circuit is by switch, power light, temperature controller, electric voltage regulator, servomotor, electrical heating elements, current protective relay, current transformer, and the composition such as current protector.
Live wire Ar, Br, Cr and the zero line of outside three-phase electricity is connected on the upper end of master switch K, the K switch 1 of the lower termination level Four electrical-heating control circuit of master switch K, K2, the upper end of K3 and K4, K switch 1, K2, the first order, the second level, the third level and fourth stage heating control circuit are accessed respectively in the lower end of K3 and K4.
First order heating control circuit is by K switch 1, power light HLa1, HLb1, HLc1, overcurrent protection relay KM11, three-phase electric pressure regulator TY31, servomotor M1, thermorelay KM12, temperature controller T1, three groups of current transformer Lma1, Lmb1, Lmc1, current protector W1, and resistance wire La1, Lb1, Lc1 composition.K switch 1 is controlled the break-make of whole road power supply, and one end of power light HLa1, HLb1, HLc1 is connected with three live wires of first order heating control circuit respectively, and the other end of power light HLa1, HLb1, HLc is all connected with zero line.Connecting with the lower end of K switch 1 in overcurrent protection relay KM11 upper end, connects with the upper end of electric voltage regulator TY31 in overcurrent protection relay KM11 lower end, and lower end and the zero line of electric voltage regulator TY31 join.The centre tap of electric voltage regulator TY31 is connected with the upper end of thermorelay KM12, and the lower end of thermorelay KM12 is connected with one end of resistance wire La1, Lb1, Lc1 respectively, and the other end of resistance wire La1, Lb1, Lc1 links together.Servomotor M1 is connected by shaft coupling with three-phase electric pressure regulator TY31.Three groups of current transformer Lma1, Lmb1, Lmc1; every group of current transformer has two lines to be connected with current protector W1 respectively; current transformer Lma1, Lmb1, Lmc1 are set on the crust of three live wires, are used for monitoring the electric current of Ar, Br, Cr three-phase current.Total control circuit is connected by shielded cable with temperature controller T1, and total control circuit inputs to the temperature setting signal of temperature controller, and thermocouple signal is input to temperature controller, and two signals compare to control temperature.Resistance wire La1, Lb1, Lc1 adopt star connection, and one end is connected together, and the other end is connected on respectively Ar, the Br of three-phase electric pressure regulator TY31, the output terminal of Cr three-phase by KM12.
The actuation means whether K switch 1 switches on for this circuit, K switch 1 closure realizes energising in circuit, and K1 opens and realizes power-off in circuit.Power light HLa1, HLb1, HLc1 are the mark of whether switching in this control circuit, light and represent energising, do not work and represent not pass into electric current.The current signal that current transformer Lma1, Lmb1, Lmc1 detect is delivered to W1, and overcurrent protection relay KM11 is controlled as the current protective device of this circuit by W1, for disconnecting circuit in the time that electric current exceedes predetermined value with protection system.Three-phase electric pressure regulator TY31 is the device of adjusting Voltage-output, can realize the power input in this heater circuit.Servomotor M1 is connected with three-phase electric pressure regulator TY31, and servomotor M1 is subject to the control of computing machine in total control circuit, receives instruction and drives three-phase electric pressure regulator TY31 to regulate.The signal that thermorelay KM12 receives temperature controller T1 carries out opening and closing, whether to pass into electric current in control circuit.Temperature controller T1 is from being positioned at the thermopair of air resistance furnace burner hearth and obtaining temperature signal and systemic presupposition temperature threshold carrying out computing, temperature controller T1 sends a signal to thermorelay KM12, controls unlatching or the closure of thermorelay KM12.Resistance wire La1, Lb1, Lc1 are the electrical heating loads of first order circuit of the present invention, are connected with three-phase regulator TY31 by thermorelay KM12, also change with the variation output power of pressure regulator voltage thereupon.
Second level heating control circuit is by K switch 2, power light HLa2, HLb2, HLc2, overcurrent protection relay KM21; three-phase electric pressure regulator TY32; servomotor M2; thermorelay KM22; temperature controller T2; current transformer Lma2, Lmb2, Lmc2, current protector W2, and Elema La2, Lb2, Lc2 composition.K switch 2 is controlled the break-make of whole road power supply, and one end of power light HLa2, HLb2, HLc2 is connected with three live wires of second level heating control circuit respectively, and the other end of power light HLa1, HLb1, HLc is all connected with zero line.Connecting with the lower end of K switch 2 in overcurrent protection relay KM21 upper end, connects with the upper end of electric voltage regulator TY32 in overcurrent protection relay KM21 lower end, and lower end and the zero line of electric voltage regulator TY32 join.The centre tap of electric voltage regulator TY32 is connected with the upper end of thermorelay KM22, and the lower end of thermorelay KM22 is connected with one end of Elema La2, Lb2, Lc2 respectively, and the other end of Elema La2, Lb2, Lc2 links together.Servomotor M2 is connected by shaft coupling with three-phase electric pressure regulator TY32.Current transformer Lma2, Lmb2, Lmc2, every group of current transformer has two lines to be connected with current protector W2 respectively, and current transformer Lma2, Lmb2, Lmc2 are set on the crust of three live wires, are used for monitoring the electric current of Ar, Br, Cr three-phase current.Total control circuit is connected by shielded cable with temperature controller T2, and total control circuit inputs to the temperature setting signal of temperature controller, and thermocouple signal is input to temperature controller, and two signals compare to control temperature.Elema La2, Lb2, Lc2 adopt star connection, and one end is connected together, and the other end is connected on respectively Ar, the Br of three-phase electric pressure regulator TY32, the output terminal of Cr three-phase by KM22.
The actuation means whether K switch 2 switches on for this circuit, K2 closure realizes energising in circuit, and K2 opens and realizes power-off in circuit.Power light HLa2, HLb2, HLc2 are the mark of whether switching in this control circuit, light and represent energising, do not work and represent not pass into electric current.The current signal that current transformer Lma2, Lmb2, Lmc2 detect is delivered to W2, and overcurrent protection relay KM21 is controlled as the current protective device of this circuit by W2, for disconnecting circuit in the time that electric current exceedes predetermined value with protection system.Three-phase electric pressure regulator TY32 is the device of adjusting Voltage-output, can realize the power input in this heater circuit.Servomotor M2 is connected with three-phase electric pressure regulator TY32, and servomotor M2 is subject to the control of computing machine in total control circuit, receives instruction to driving three-phase electric pressure regulator TY32 to regulate.The signal that thermorelay KM22 accepts temperature controller T2 carries out opening and closing whether to pass into electric current in control circuit.Temperature controller T2 is from being positioned at the thermopair of air resistance furnace burner hearth and obtaining temperature signal and systemic presupposition temperature threshold carrying out computing, and temperature controller T2 sends a signal to thermorelay KM22 and controls and open or closed.Elema La2, Lb2, Lc2 are the second level of the present invention electrical heating loads, are connected with three-phase regulator TY32 by KM22, also change with the variation output power of pressure regulator voltage thereupon.
Third level heating control circuit is by K switch 3; power light HLa3, HLb3, HLc3, overcurrent protection relay KM31; three-phase electric pressure regulator TY33; servomotor M3; thermorelay KM32, temperature controller T3, current transformer Lma3, Lmb3, Lmc3; current protector W3, and Elema La3, Lb3, Lc3 composition.K switch 3 is controlled the break-make of whole road power supply, and one end of power light HLa3, HLb3, HLc3 is connected with three live wires of third level heating control circuit respectively, and the other end of power light HLa3, HLb3, HLc3 is all connected with zero line.Connecting with the lower end of K switch 3 in overcurrent protection relay KM31 upper end, connects with the upper end of electric voltage regulator TY33 in overcurrent protection relay KM31 lower end, and lower end and the zero line of electric voltage regulator TY33 join.The centre tap of electric voltage regulator TY33 is connected with the upper end of thermorelay KM32, and the lower end of thermorelay KM32 is connected with one end of Elema La3, Lb3, Lc3 respectively, and the other end of Elema L3, Lb3, Lc3 links together.Servomotor M3 is connected by shaft coupling with three-phase electric pressure regulator TY33.Three groups of current transformer Lma3, Lmb3, Lmc3; every group of current transformer has two lines to be connected with current protector W3 respectively; current transformer Lma3, Lmb3, Lmc3 are sleeved on the crust of three live wires, are used for monitoring respectively the electric current of Ar, Br, Cr three-phase current.Total control circuit is connected by shielded cable with temperature controller T3, and total control circuit inputs to the temperature setting signal of temperature controller, and thermocouple signal is input to temperature controller, and two signals compare to control temperature.Elema La3, Lb3, Lc3 adopt star connection, and one end is connected together, and the other end is connected on respectively Ar, the Br of three-phase electric pressure regulator TY33, the output terminal of Cr three-phase by KM32.
The actuation means whether K switch 3 switches on for this circuit, K3 closure realizes energising in circuit, and K3 opens and realizes power-off in circuit.Power light HLa3, HLb3, HLc3 are the mark of whether switching in this control circuit, light and represent energising, do not work and represent not pass into electric current.The current signal that current transformer Lma3, Lmb3, Lmc3 detect is delivered to W3, and overcurrent protection relay KM31 is controlled as the current protective device of this circuit by W3, for disconnecting circuit in the time that electric current exceedes predetermined value with protection system.Three-phase electric pressure regulator TY33 is the device of adjusting Voltage-output, can realize the power input in this heater circuit.Servomotor M3 is connected with three-phase electric pressure regulator TY33, and servomotor M3 is subject to the control of computing machine in total control circuit, receives instruction to driving three-phase electric pressure regulator TY33 to regulate.The signal that thermorelay KM32 accepts temperature controller T3 carries out opening and closing whether to pass into electric current in control circuit.Temperature controller T3 is from being positioned at the thermopair of burner hearth and obtaining temperature signal and systemic presupposition temperature threshold carrying out computing, and temperature controller T3 sends a signal to thermorelay KM32 and controls and open or closed.Elema La3, Lb3, Lc3 are the electrical heating loads of tertiary circuit of the present invention, and Elema La3, Lb3, Lc3 are connected with three-phase regulator by KM32 respectively, also change with the variation output power of pressure regulator voltage thereupon.
Fourth stage heating control circuit is by K switch 4; power light HLa4, HLb4, HLc4, overcurrent protection relay KM41; three-phase electric pressure regulator TY34; servomotor M4; thermorelay KM42, temperature controller T4, current transformer Lma4, Lmb4, Lmc4; current protector W4, and Elema La4, Lb4, Lc4 composition.K switch 4 is controlled the break-make of whole road power supply, and one end of power light HLa4, HLb4, HLc4 is connected with three live wires of first order heating control circuit respectively, and the other end of power light HLa4, HLb4, HLc4 is all connected with zero line.Connecting with the lower end of K switch 4 in overcurrent protection relay KM41 upper end, connects with the upper end of electric voltage regulator TY34 in overcurrent protection relay KM41 lower end, and lower end and the zero line of electric voltage regulator TY34 join.The centre tap of electric voltage regulator TY34 is connected with the upper end of thermorelay KM42, and the lower end of thermorelay KM42 is connected with one end of Elema La4, Lb4, Lc4 respectively, and the other end of Elema L4, Lb4, Lc4 links together.Servomotor M4 is connected by shaft coupling with three-phase electric pressure regulator TY34.Three groups of current transformer Lma4, Lmb4, Lmc4; every group of current transformer has two lines to be connected with current protector W4 respectively; current transformer Lma4, Lmb4, Lmc4 are sleeved on the crust of three live wires, are used for monitoring respectively the electric current of Ar, Br, Cr three-phase current.Total control circuit is connected by shielded cable with temperature controller T4, and total control circuit inputs to the temperature setting signal of temperature controller, and thermocouple signal is input to temperature controller, and two signals compare to control temperature.Elema La4, Lb4, Lc4 adopt star connection, and one end is connected together, and the other end is connected on respectively Ar, the Br of three-phase electric pressure regulator TY34, the output terminal of Cr three-phase by thermorelay KM42.
The actuation means whether K switch 4 switches on for this circuit, K4 closure realizes energising in circuit, and K4 opens and realizes power-off in circuit.Power light HLa4, HLb4, HLc4 are the mark of whether switching in this control circuit, light and represent energising, and not working to be expressed as passes into electric current.The current signal that current transformer Lma4, Lmb4, Lmc4 detect is delivered to W4, and overcurrent protection relay KM41 is controlled as the current protective device of this circuit by W4, for disconnecting circuit in the time that electric current exceedes predetermined value with protection system.Three-phase electric pressure regulator TY34 is the device of adjusting Voltage-output, can realize the power input in this heater circuit.Servomotor M4 is connected with three-phase electric pressure regulator TY34, and servomotor M4 is subject to the control of computing machine in total control circuit, receives instruction to driving three-phase electric pressure regulator TY34 to regulate.The signal that thermorelay KM42 accepts temperature controller T4 carries out opening and closing whether to pass into electric current in control circuit.Temperature controller T4 is from being positioned at the thermopair of burner hearth and obtaining temperature signal and systemic presupposition temperature threshold carrying out computing, and temperature controller T4 sends a signal to thermorelay KM42 and controls and open or closed.Elema La4, Lb4, Lc4 are the electrical heating loads of fourth stage circuit of the present invention, and Elema La4, Lb4, Lc4 are connected with three-phase regulator by KM42 respectively, also change with the variation output power of pressure regulator voltage thereupon.
When work, master switch K closure, whole electrical-heating control circuit is in opening.Closure or unlatching K1, K2, K3 and K4 can control level Four heating control circuit and work or some work simultaneously.Taking first order electric heating control loop as example, when K switch 1 is closed, power light HLa1, HLb1, HLc1 are simultaneously bright, in the time that overhead control cabinet sends " start " signal, and overcurrent protection relay KM11 closure, three-phase electric pressure regulator TY31 enters duty.Total control circuit control thermorelay KM12 closure, first order power supply is all connected, and heating load La1, Lb1, Lc1 switch on power simultaneously, and first order power supply can bringing onto load output power.Servomotor M1 is connected by shaft coupling with three-phase electric pressure regulator TY31, is controlled by total control circuit, and servomotor M1 controls the amplitude of accommodation of three-phase electric pressure regulator TY31 and then controls the electric current input in first order circuit, realizes the adjusting of power.Current transformer Lma1, Lmb1, Lmc1 gather the electric current in each phase splitter; in the time that overcurrent protector W1 receives current transformer Lma1, Lmb1, electric current that Lmc1 gathers and exceedes predetermined threshold; when overcurrent protector W1 sends instruction, overcurrent protection relay KM11 is disconnected; cut off the electric current of first order heater circuit, realize overcurrent protection.The thermopair that is positioned at burner hearth is measured the temperature of the heating region that first order heating control circuit controls in real time, temperature signal is delivered in temperature controller T1 and is calculated, when measured temperature value is during higher than the default temperature threshold of first order electrical-heating control circuit, temperature controller T1 transmitted signal break-off signal pilot relay KM12, the input of cutting off the electricity supply.In the time recording temperature and drop to lower than the default temperature threshold of first order electrical-heating control circuit, temperature controller T1 sends instruction and makes thermorelay KM12 closure, starts to heat in this region.The second level, the third level and fourth stage electrical-heating control circuit adopt the method for operation identical with first order electric heating control loop, realize respectively the heating function in each region.
Figure 2 shows that the circuit of the embodiment of the present invention 2.Embodiment 2 is different with the embodiment 1 shown in Fig. 1, and the level Four heating control circuit of embodiment 1 is all three-phase electricity output, is applicable to the power supply of relatively high power output.The first order heating control circuit of embodiment 2 is the electrical-heating control circuit of three-phase electricity output, second and third, level Four is the electrical-heating control circuit of two-phase electricity output.Embodiment 2 is mainly used in the power supply output of smaller power, and easier than the circuit control of embodiment 1, cost is lower.The structure of the first order heating control circuit of embodiment 2 is identical with the structure of the first order heating control circuit of embodiment 1, as shown in Figure 1.Embodiment 2 second, third, the power supply of the fourth stage is the power supply of two-phase output.Second level heating control circuit is by K switch 2, protective tube PU1; power light HLa2, overcurrent protection relay KM21, two-phase electric voltage regulator TY22, servomotor M2; thermorelay KM22; temperature controller T2, current transformer Lma2, current protector W2; and Elema L2 composition; in K switch 2, terminate at the lower end of master switch K, the live wire of this road power supply is Ar, terminates at the lower end of K switch 2 on protective tube PU1.Termination KM21 upper end under PU1, the upper end of termination two-phase electric voltage regulator TY22 under KM21, the lower terminal connecting zero line of TY22.The centre tap jointing temp pilot relay KM22 upper end of TY22, one end of the lower termination Elema L2 of KM22, the Elema L2 other end is connected on zero line.Thermorelay KM22 is controlled by temperature controller T1, and overcurrent protection relay KM21 is subject to the control of overcurrent protector W2.Servomotor M2 is connected by shaft coupling with two-phase electric voltage regulator TY22, and current transformer Lmb2 is connected with overcurrent protector W2, and Current Mutual Inductance Lmb2 is sleeved on the crust of Ar phase firewire, for monitoring current.Total control circuit is connected by shielded cable with temperature controller T2, and total control circuit inputs to the temperature setting signal of temperature controller, and thermocouple signal is input to temperature controller, and two signals compare to control temperature.
The actuation means whether K switch 2 switches on for this circuit, K2 closure realizes energising in circuit, and K2 opens and realizes power-off in circuit.Protective tube PU1 is no more than safety value for the protection of the electric current in circuit.Power light HLa2 is the mark of whether switching in this control circuit, lights and represents energising, does not work and represents not pass into electric current.Overcurrent protection relay KM21 is the current protective device of this circuit, for disconnecting circuit in the time that electric current exceedes predetermined value with protection system.Two-phase electric voltage regulator TY22 is the device of adjusting Voltage-output, can realize the power input in this heater circuit.Servomotor M2 is connected with two-phase electric voltage regulator TY22, and servomotor M2 is subject to the control of computing machine in total control circuit, receives instruction and drives two-phase electric voltage regulator TY22 to regulate.The signal that thermorelay KM22 accepts temperature controller T2 carries out opening and closing whether to pass into electric current in control circuit.Temperature controller T2 obtains the temperature setting signal that temperature signal and total control circuit input to temperature controller and compares from being positioned at the thermopair of air-heating furnace burner hearth., temperature controller T2 sends a signal to thermorelay KM22 and controls unlatching or closed.Elema L2 is the electrical heating load of the second level of the present invention circuit, also changes with the variation output power of pressure regulator voltage thereupon.The third level is identical with second level heating control circuit with the structure of fourth stage heating control circuit.
When work, master switch K closure, whole electrical-heating control circuit is in opening.Closure or opening switch K1, K2, K3 and K4 can control level Four heating control circuit and work or some work simultaneously.First order electrical-heating control circuit is three-phase electricity heating, and the second level, the third level and fourth stage electrical heating loop are respectively that three by three-phase electricity are two-phase electrical heating with zero line.First order electric heating control loop works process is identical with embodiment 1.The second level, the third level are identical with fourth stage electrical heating loop works mode.Taking electrical heating loop, the second level as example, when K switch 2 is closed, power light HLa2 lights, in the time that total control circuit sends " start " signal, and overcurrent protection relay KM21 closure, two-phase electric voltage regulator TY22 enters duty.Temperature controller T2 controls thermorelay KM22 closure, and second level power supply is all connected, and heating load L2 switches on power, and second level power supply can bringing onto load output power.Servomotor M2 is connected by shaft coupling with two-phase electric voltage regulator TY22, and by computing machine and the operational amplifier control servomotor M2 of total control circuit, servomotor M2 control two-phase electric voltage regulator TY22 regulation voltage is realized the adjusting of power.Current transformer LMa2 gathers the electric current in this circuit, and in the time that overcurrent protector W2 receives current transformer electric current that LMa2 gathers and exceedes predetermined threshold, overcurrent protector W2 sends instruction disconnects overcurrent protection relay KM21, realizes overcurrent protection.The thermopair that is positioned at burner hearth is measured the temperature of the heating region that second level heating control circuit controls in real time, temperature signal is delivered in temperature controller T2 and is compared, when measured temperature value is during higher than the default temperature threshold of second level electrical-heating control circuit, temperature controller T2 transmitted signal break-off signal pilot relay KM22, the input of cutting off the electricity supply.In the time recording temperature and drop to lower than the default temperature threshold of second level electrical-heating control circuit, temperature controller T2 sends instruction and makes thermorelay KM22 closure, starts to heat in this region.The third level adopts the method for operation identical with electric heating control loop, the second level with fourth stage electrical-heating control circuit, realizes respectively the heating function in each region.
Claims (3)
1. for an electrical-heating control circuit for air resistance furnace, described electrical-heating control circuit is by level Four heating control circuit, master switch and master control the electric circuit constitute; In described level Four heating control circuit, first order heating control circuit is for controlling the preheating of air section of air resistance furnace, and the electrical heating elements of controlling is positioned at the front end of air resistance furnace, near the entrance of air; The electrical heating elements that fourth stage heating control circuit is controlled is arranged in the position near air out; The electrical heating elements that second level heating control circuit and third level heating control circuit are controlled is arranged between first order heating control circuit and fourth stage heating control circuit; External ac power source is by described master switch access, and level Four heating control circuit is connected to the lower end of master switch; Level Four heating control circuit is connected with total control circuit, is sent and is driven signal and temperature setting signal by total control circuit, controls level Four heating control circuit;
The electrical heating elements that described first order heating control circuit is controlled is resistance wire, and the electrical heating elements that second level heating control circuit, third level heating control circuit and fourth stage heating control circuit are controlled is Elema,
It is characterized in that, described first order heating control circuit is by switch, three power lights, overcurrent protection relay, three-phase electric pressure regulator, servomotor, thermorelay, temperature controller, three groups of current transformers, current protector, and electrical heating elements composition; One end of three power lights is connected with three live wires of switch respectively, and the other end of three power lights is all connected with zero line; Connecting with the lower end of switch in the upper end of overcurrent protection relay, connects with the upper end of electric voltage regulator in the lower end of overcurrent protection relay, and lower end and the zero line of electric voltage regulator join; The centre tap of electric voltage regulator is connected with the upper end of thermorelay, and the lower end of thermorelay is connected with one end of three resistance wires respectively, and the other end of three resistance wires links together; Servomotor is connected by shaft coupling with three-phase electric pressure regulator; Every group of current transformer in three groups of current transformers has two lines to be connected with current protector respectively, and three groups of current transformers are set on the crust of three live wires, for monitoring the electric current of three-phase current; Electrical heating elements adopts star connection, and one end of electrical heating elements is connected together, and the other end is connected on respectively the three-phase output end of three-phase electric pressure regulator by thermorelay.
2. electrical-heating control circuit according to claim 1, it is characterized in that, when described level Four heating control circuit is inputted for two-phase electricity, described first order heating control circuit is the electrical-heating control circuit of three-phase electricity output, and the second heating control circuit, third level heating control circuit and fourth stage heating control circuit are the electrical-heating control circuit of two-phase electricity output.
3. electrical-heating control circuit according to claim 1, it is characterized in that, the temperature controller of described total control circuit control level Four heating control circuit is from the thermopair Real-time Obtaining temperature signal in air resistance furnace, the converter of temperature signal in temperature controller is converted to voltage signal, preset value in this voltage signal and temperature controller compares, send according to the steering logic of setting the instruction of whether adjusting voltage, realize temperature feedback control; In the time recording temperature higher than preset value, temperature controller sends the thermorelay disconnection that instruction makes heating control circuit, and the electrical heating elements that stops air resistance furnace heating heating region; In the time recording temperature and drop to preset value, temperature controller sends instruction and makes thermorelay closure, starts to heat in this heating region; The servomotor of level Four heating control circuit is subject to the control of total control circuit, receives and drives instruction to carry out voltage-regulation to three-phase electric pressure regulator.
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| CN201210487880.0A CN102981532B (en) | 2012-11-26 | 2012-11-26 | Electric heating control circuit for air resistance furnace |
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| CN201210487880.0A CN102981532B (en) | 2012-11-26 | 2012-11-26 | Electric heating control circuit for air resistance furnace |
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| CN102981532B true CN102981532B (en) | 2014-11-26 |
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| WO2008140700A1 (en) * | 2007-05-11 | 2008-11-20 | Searle Bruce R | Quartz tube infrared heater system |
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| CN202362684U (en) * | 2011-11-11 | 2012-08-01 | 安徽禾田电气有限公司 | Low-voltage electric heating control device |
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| WO2008140700A1 (en) * | 2007-05-11 | 2008-11-20 | Searle Bruce R | Quartz tube infrared heater system |
| CN201430441Y (en) * | 2009-04-30 | 2010-03-24 | 重庆哈丁科技有限公司 | Test box heating power supply |
| CN201527593U (en) * | 2009-09-27 | 2010-07-14 | 中航力源液压股份有限公司 | Test bed oil and environmental temperature control device |
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| CN202362684U (en) * | 2011-11-11 | 2012-08-01 | 安徽禾田电气有限公司 | Low-voltage electric heating control device |
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