CN204993078U - Permanent power conditioning circuitry of thyristor of intermediate frequency smelting furnace - Google Patents
Permanent power conditioning circuitry of thyristor of intermediate frequency smelting furnace Download PDFInfo
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- CN204993078U CN204993078U CN201520807340.5U CN201520807340U CN204993078U CN 204993078 U CN204993078 U CN 204993078U CN 201520807340 U CN201520807340 U CN 201520807340U CN 204993078 U CN204993078 U CN 204993078U
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Abstract
The utility model discloses a permanent power conditioning circuitry of thyristor of intermediate frequency smelting furnace, three phase current are connected with three phase bridge, and three phase bridge is connected to one -way contravariant bridge through flat ripples inductance, and the output of one -way contravariant bridge is connected with the heating load, connect in parallel and have first electric capacity in the both ends of heating load, still connect in parallel and have the regulating circuit in the both ends of heating load, the regulating circuit is including connecting the single phase rectification bridge at the heating load both ends, and reverse input end that the output of single phase rectification bridge was put through first ohmic connection to first fortune, positive going input end that first fortune was put be through the 2nd grounding, and the both ends of first resistance are parallelly connected to have second electric capacity, output that reverse input end that first fortune was put to first fortune through the third resistance of establishing ties and the 3rd capacitance connection, and the output series connection that first fortune was put has fourth resistance, the 5th resistance and the 6th resistance. The utility model discloses the not enough of prior art can be improved, the stability of equipment operation has been improved.
Description
Technical field
The utility model relates to industry heating technical field, especially a kind of thyristor invariable power regulating circuit of mid-frequency melting furnace.
Background technology
It is molten iron that mid-frequency melting furnace is mainly used in metal moltens such as wastes of iron and steel, and molten iron casts required form workpiece after pouring sand mo(u)ld into.Apply with other of intermediate frequency equipment compared with (quench, diathermanous), state during mid-frequency melting furnace work has significant difference, Here it is operationally tank circuit equiva lent impedance alter a great deal, namely when direct voltage one timing, altering a great deal of direct current.When material is few in stove, electric current is very little, expects that many times electric currents is very large; During cold conditions, electric current is comparatively large, and time hot, electric current is less; During new furnace lining (furnace wall is thick), electric current is less, and during old furnace lining (furnace wall is thin), electric current is larger.Thus, when different conditions, the ratio of voltage and current is also just very greatly different.Existing mid-frequency melting furnace, when impedance larger current is less, if want to increase power, can only raise direct voltage, but the maximum of direct voltage is certain, it is decided by three-phase input voltage; When impedance small electric stream is very large, it is desirable to reduce electric current, in order to avoid overcurrent damage, can only reduce direct voltage, but direct voltage is lower, power factor is lower, reactive current is larger, and harmonic pollution is also larger, both takes electricity, also affects other power consumption equipment.And, because power output approximates voltage and amp product, the two any one lower, power output is just low, can affect burn-off rate.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of thyristor invariable power regulating circuit of mid-frequency melting furnace, can solve the deficiencies in the prior art, improves the stability that equipment runs.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of thyristor invariable power regulating circuit of mid-frequency melting furnace, three phase mains is connected with three-phase commutation bridge, three-phase commutation bridge is connected to unidirectional inverter bridge by flat ripple inductance, the output of unidirectional inverter bridge is connected with heating load, the two ends of heating load are parallel with the first electric capacity, and the two ends of heating load are also parallel with regulating circuit, regulating circuit comprises the single-phase rectification bridge being connected to heating load two ends, the output of single-phase rectification bridge is connected to the reverse input end of the first amplifier by the first resistance, the positive input of the first amplifier is by the second grounding through resistance, the two ends of the first resistance are parallel with the second electric capacity, the reverse input end of the first amplifier is connected to the output of the first amplifier by the 3rd resistance of series connection and the 3rd electric capacity, the output of the first amplifier is connected in series with the 4th resistance, 5th resistance and the 6th resistance, seven resistance of output by connecting of single-phase rectification bridge, 4th electric capacity, 5th electric capacity and the 6th capacity earth, the two ends of the 5th electric capacity are parallel with the first triode, the two ends of the 6th electric capacity are parallel with the second triode, the base stage of the first triode is connected between the 4th resistance and the 5th resistance, the base stage of the second triode is connected between the 5th resistance and the 6th resistance.
The beneficial effect adopting technique scheme to bring is: the utility model obtains intermediate frequency power supply by three phase mains is carried out rectification, filtering and inversion.By changing the phase place of rectifier and trigger pulse in switching process, realizing the controllable adjustment of output voltage, by adjustment inverse envelope in reversals, changing tank circuit resistance value, thus reaching the object of adjustment current value.By the adjustment for voltage and current, achieve the substantially constant of power output.Regulating circuit is gathered by the change exported inverter bridge voltage, uses the break-make of its variation tendency to two triodes to control, thus changes the reactance value of whole regulating circuit, realizes improving power factor, reduces the object of harmonic pollution.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment.
Fig. 2 is the circuit diagram of regulating circuit in the utility model embodiment.
In figure: V1, three-phase commutation bridge; V2, single-phase rectification bridge; S, three phase mains; U, unidirectional inverter bridge; AC, regulating circuit; R1, the first resistance; R2, the second resistance; R3, the 3rd resistance; R4, the 4th resistance; R5, the 5th resistance; R6, the 6th resistance; R7, the 7th resistance; C1, the first electric capacity; C2, the second electric capacity; C3, the 3rd electric capacity; C4, the 4th electric capacity; C5, the 5th electric capacity; C6, the 6th electric capacity; L1, flat ripple inductance; L2, heating load; A1, the first amplifier; Q1, the first triode; Q2, the second triode.
Embodiment
With reference to Fig. 1-2, in the utility model embodiment, three phase mains S is connected with three-phase commutation bridge V1, three-phase commutation bridge V1 is connected to unidirectional inverter bridge U by flat ripple inductance L 1, the output of unidirectional inverter bridge U is connected with heating load L2, the two ends of heating load L2 are parallel with the first electric capacity C1, and the two ends of heating load L2 are also parallel with regulating circuit AC, regulating circuit AC comprises the single-phase rectification bridge V2 being connected to heating load L2 two ends, the output of single-phase rectification bridge V2 is connected to the reverse input end of the first amplifier A1 by the first resistance R1, the positive input of the first amplifier A1 is by the second resistance R2 ground connection, the two ends of the first resistance R1 are parallel with the second electric capacity C2, the reverse input end of the first amplifier A1 is connected to the output of the first amplifier A1 by the 3rd resistance R3 of series connection and the 3rd electric capacity C3, the output of the first amplifier A1 is connected in series with the 4th resistance R4, 5th resistance R5 and the 6th resistance R6, the seven resistance R7 of output by connecting of single-phase rectification bridge V2, 4th electric capacity C4, 5th electric capacity C5 and the 6th electric capacity C6 ground connection, the two ends of the 5th electric capacity C5 are parallel with the first triode Q1, the two ends of the 6th electric capacity C6 are parallel with the second triode Q2, the base stage of the first triode Q1 is connected between the 4th resistance R4 and the 5th resistance R5, the base stage of the second triode Q2 is connected between the 5th resistance R5 and the 6th resistance R6.
Wherein, the first resistance R1 is 80k Ω, and the second resistance R2 is 120k Ω, and the 3rd resistance R3 is 50k Ω, and the 4th resistance R4 is 200k Ω, and the 5th resistance R5 is 200k Ω, the 6th resistance R6 is 200k Ω, and the 7th resistance R7 is 350k Ω.The capacitor value of the first electric capacity C1 is determined according to the induction reactance value of smelting furnace heater circuit, and the second electric capacity C2 is 79 μ F, and the 3rd electric capacity C3 is 100 μ F, and the 4th electric capacity C4 is 400 μ F, and the 5th electric capacity C5 is 300 μ F, the 6th electric capacity C6 is 300 μ F.Flat ripple inductance L 1 is 35mH, and the induction reactance value of heating load L2 is measured according to actual heater strip and obtains.
By adjustment inverse envelope, change tank circuit resistance value, thus realize when direct voltage is constant (normally maximum), make electric current desirably direction change, diminish time excessive, become large time too small, thus realize close to invariable power operating state.Inverter control circuit is according to operating state requirement, and the trigger rate of adjustment inversion in good time, thus the impedance of the change tank circuit, overcome the adverse effect that smelting furnace state variation is brought, substantially improve equipment performance.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. the thyristor invariable power regulating circuit of a mid-frequency melting furnace, it is characterized in that: three phase mains (S) is connected with three-phase commutation bridge (V1), three-phase commutation bridge (V1) is connected to unidirectional inverter bridge (U) by flat ripple inductance (L1), the output of unidirectional inverter bridge (U) is connected with heating load (L2), the two ends of heating load (L2) are parallel with the first electric capacity (C1), and the two ends of heating load (L2) are also parallel with regulating circuit (AC), regulating circuit (AC) comprises the single-phase rectification bridge (V2) being connected to heating load (L2) two ends, the output of single-phase rectification bridge (V2) is connected to the reverse input end of the first amplifier (A1) by the first resistance (R1), the positive input of the first amplifier (A1) is by the second resistance (R2) ground connection, the two ends of the first resistance (R1) are parallel with the second electric capacity (C2), the reverse input end of the first amplifier (A1) is connected to the output of the first amplifier (A1) by the 3rd resistance (R3) of series connection and the 3rd electric capacity (C3), the output of the first amplifier (A1) is connected in series with the 4th resistance (R4), 5th resistance (R5) and the 6th resistance (R6), seven resistance (R7) of output by connecting of single-phase rectification bridge (V2), 4th electric capacity (C4), 5th electric capacity (C5) and the 6th electric capacity (C6) ground connection, the two ends of the 5th electric capacity (C5) are parallel with the first triode (Q1), the two ends of the 6th electric capacity (C6) are parallel with the second triode (Q2), the base stage of the first triode (Q1) is connected between the 4th resistance (R4) and the 5th resistance (R5), the base stage of the second triode (Q2) is connected between the 5th resistance (R5) and the 6th resistance (R6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520807340.5U CN204993078U (en) | 2015-10-19 | 2015-10-19 | Permanent power conditioning circuitry of thyristor of intermediate frequency smelting furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520807340.5U CN204993078U (en) | 2015-10-19 | 2015-10-19 | Permanent power conditioning circuitry of thyristor of intermediate frequency smelting furnace |
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| CN204993078U true CN204993078U (en) | 2016-01-20 |
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| CN201520807340.5U Expired - Fee Related CN204993078U (en) | 2015-10-19 | 2015-10-19 | Permanent power conditioning circuitry of thyristor of intermediate frequency smelting furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114679805A (en) * | 2022-03-16 | 2022-06-28 | 重庆银雁科技有限公司 | Special energy controller for induction quenching |
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2015
- 2015-10-19 CN CN201520807340.5U patent/CN204993078U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114679805A (en) * | 2022-03-16 | 2022-06-28 | 重庆银雁科技有限公司 | Special energy controller for induction quenching |
| CN114679805B (en) * | 2022-03-16 | 2023-08-15 | 重庆银雁科技有限公司 | Special energy controller for induction quenching |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20211019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |