CN108947210B - Power supply device for platinum channel of high-temperature molten glass - Google Patents

Power supply device for platinum channel of high-temperature molten glass Download PDF

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CN108947210B
CN108947210B CN201810819985.9A CN201810819985A CN108947210B CN 108947210 B CN108947210 B CN 108947210B CN 201810819985 A CN201810819985 A CN 201810819985A CN 108947210 B CN108947210 B CN 108947210B
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load
power supply
transformer
phase
secondary side
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CN108947210A (en
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高维刚
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Irico Display Devices Co Ltd
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Irico Display Devices Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/02—Forehearths, i.e. feeder channels
    • C03B7/06—Means for thermal conditioning or controlling the temperature of the glass
    • C03B7/07—Electric means

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention provides a novel power distribution system of a platinum channel, which consists of a power supply V1, three phase-shifting transformers T2, T3 and T4, a regulating transformer T1 and platinum channel loads R1, R2, R3 and R4, wherein the impedances from each section of the platinum channel to the secondary side of the power supply transformer are R5, R6, R7, R8 and R9, wherein the power supply V1 provides a three-phase power supply, the phases of the channels of the phase-shifting transformers T2, T3 and T4 are converted into same-phase power which is connected in parallel to the regulating transformer T1, the primary side of the regulating transformer T1 has no tap, the secondary side has two or more slide taps, the secondary side voltage can be controlled by adjusting each slide tap, and further the direct current of the channel and the current of a channel connecting flange can be adjusted.

Description

Power supply device for platinum channel of high-temperature molten glass
Technical Field
The invention relates to the technical field of glass substrate manufacturing, in particular to a power supply device for a platinum channel of high-temperature molten glass.
Background
In order to reduce the composition non-uniformity and the generation of gas inclusions caused by the contact of molten glass and refractory materials in the production and manufacturing process of TFT-LCD glass substrates, a platinum channel is generally used for connecting a melting tank and a forming device, the platinum channel is a device for realizing the clarification, homogenization, stirring and temperature regulation of the molten glass, each section of the platinum channel is required to realize the specific function under the corresponding viscosity, and the control of the viscosity is implemented through the control of the temperature of the platinum channel.
The temperature control of the platinum channel is realized by electric heating, the electric heating implementation mode comprises an indirect heating method and a direct heating method, and the direct heating method is taken as the preferred electric heating method, has the advantages of high thermal efficiency, small time lag, easy control and the like, and becomes the mainstream electric heating realization method in the TFT-LCD glass substrate industry. The direct heating method is to apply controlled alternating current to the platinum channel section to be heated through a flange mounted on the platinum channel body.
As shown in fig. 2, in the prior art, flange temperature is generally reduced by water cooling, and flange temperature is adjusted by adjusting a current superposition value of the entire flange and a heat preservation condition around the flange by channel phase sequence superposition phase difference, but the phase sequence superposition phase difference inevitably causes a lower power factor of a single heating circuit, and particularly, if a power regulator is used for supplying power to adjust and control circuit current by chopping, the power factor is lower, the harmonic ratio in the circuit is increased, the electric energy ratio for heating in the circuit is smaller, and electric energy is greatly wasted.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a power supply device of a platinum channel of high-temperature molten glass, which adjusts and controls each sliding tap on the secondary side of a transformer so as to adjust the direct current of the channel and the current of a channel connecting flange and realize the purpose of saving electric energy.
The invention is realized by the following technical scheme:
a power supply device of a platinum channel of high-temperature molten glass comprises a power supply, a phase-shifting transformer and a regulating transformer T1;
the input end of the phase-shifting transformer is connected with a power supply, the output end of the phase-shifting transformer is connected with the primary side of the regulating transformer T1, at least two groups of sliding taps are arranged on the secondary side of the regulating transformer T1, each group of sliding taps comprises a fixed tapping end and a sliding end, and impedance and load are connected between the fixed end and the sliding end in series.
Preferably, the phase-shifting transformer comprises phase-shifting transformers T2, T3 and T4 connected in parallel, and the ratio of the phase-shifting transformers is 1: 1.
Preferably, the number of the sliding taps is four, the fixed ends of the four groups of sliding taps are respectively a1, a2, a3 and a4, and the sliding ends are respectively b1, b2, b3 and b 4;
the a1 end connected with the secondary side of the regulating transformer T1 is connected with a resistor R5, a load R1 and a resistor R6 in sequence, and the resistor R6 is connected with the b1 end connected with the secondary side;
the a2 end, the a3 end and the a4 end are respectively connected with the a1 end, the b2 end is sequentially connected with a resistor R7 and a load R2 in series, and the load 2 is connected with the load R1;
the b3 end is connected in series with a resistance R8 and a load R3 in sequence, and the load R3 is connected with a load R2;
the b4 end is connected with the resistance R9 and the load R4 in turn, and the load R4 is connected with the load R32.
Preferably, the load R1 corresponds to the maximum voltage transformation ratio 380:10 of the transformer; the load R2 corresponds to the transformer maximum voltage transformation ratio 380:20, the load R3 corresponds to the transformer maximum voltage transformation ratio 380:30, and the load R4 corresponds to the transformer maximum voltage transformation ratio 380: 40.
Preferably, the impedance values of the loads R1, R2, R3 and R4 are 0.5 to 3m Ω, and the impedance values of the impedances R5, R6, R7, R8 and R9 are 0.01 to 0.1m Ω.
Preferably, the power supply is a single-phase power supply or a three-phase power supply.
Compared with the prior art, the invention has the following beneficial technical effects:
the primary side of the regulating transformer T1 of the power supply device supplies power directly from a single-phase power supply or a three-phase power supply through a phase-shifting transformer, the secondary side of the regulating transformer T1 is provided with a plurality of groups of taps, and the plurality of groups of taps are respectively connected with a load to realize multi-loop combined control of a platinum channel. The voltage regulation mode is changed, the power factor is improved, the loop harmonic quantity can be reduced, the running stability of the equipment is improved, and meanwhile, the energy is saved and the production cost is reduced.
The loop current is superposed on the resistors R1/R2/R3/R4 and the secondary side connecting resistor R5 in the same phase, and the temperature of the secondary side connecting resistor R5 is only required to be reduced.
Drawings
FIG. 1 is a circuit diagram of a power supply apparatus of the present invention;
fig. 2 is a circuit diagram of a conventional power supply device.
FIG. 3 is a schematic diagram of the primary side connection of a transformer;
FIG. 4 is a schematic diagram of the secondary side connection of the transformer;
a and B are primary side connecting ends of the transformer; c is a circular magnetic core; d is a guide rail; h is a sliding block; y is a primary coil; e1, E2, E3 and E4 are secondary coils;
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
As shown in fig. 1, a platinum channel power distribution system includes a three-phase power supply V1, a phase-shifting transformer T2, a phase-shifting transformer T3, a phase-shifting transformer T4, and a regulating transformer T1, where the loads of four sections of the platinum channel to each section are R1, R2, R3, and R4, and the impedances of each section of the platinum channel to the secondary side of the power supply transformer are R5, R6, R7, R8, and R9.
A three-phase power supply V1 provides a three-phase power supply, a three-phase power supply V1 is respectively connected with input ends of phase-shifting transformers T2, T3 and T4, the phase-shifting transformers T2, T3 and T4 are connected in parallel, output ends of the phase-shifting transformers T2, T3 and T4 are connected with a primary side of a regulating transformer T1, channel phases of the phase-shifting transformers T2, T3 and T4 are converted into same-phase power supplies and connected in parallel to the regulating transformer T1, two or more sliding taps are arranged on a secondary side of a control transformer T1, voltage of the secondary side can be controlled by adjusting each sliding tap, and channel direct current and channel connection flange current are further regulated.
The secondary side is provided with four groups of sliding taps, each group of taps comprises a fixed end and a sliding end, the secondary side voltage of the taps can be controlled in a sliding mode, the fixed ends of the four groups of sliding taps are respectively a1, a2, a3 and a4, and the sliding ends of the four groups of sliding taps are respectively b1, b2, b3 and b 4.
The a1 end connected with the secondary side of the regulating transformer T1 is connected with the resistor R5, the load R1 and the resistor R6 in sequence, and the resistor R6 is connected with the b1 end of the secondary side.
The a2 terminal, the a3 terminal and the a4 terminal are respectively connected with the a1 terminal, the b2 terminal is sequentially connected with the impedance R7 and the load R2, and the load R2 is connected with the load R1.
The b3 end is connected with the resistance R8 and the load R3 in turn, and the load R3 is connected with the load R2.
The b4 end is connected with the resistance R9 and the load R4 in turn, and the load R4 is connected with the load R3.
The three-phase power supply V1 is a three-phase 380V, 50HZ power supply.
Three phase shifting transformers T2/T3/T4 with a transformer ratio of 1:1 are used to shift the phases to the same phase.
The secondary side of the regulating transformer T1 corresponds to a platinum channel, and the regulating transformation ratio ranges of the platinum channel corresponding to the regulating transformer T1 are respectively as follows:
the load R1 corresponds to the maximum transformer transformation ratio 380:10, the load R2 corresponds to the maximum transformer transformation ratio 380:20, the load R3 corresponds to the maximum transformer transformation ratio 380:30, and the load R4 corresponds to the maximum transformer transformation ratio 380: 40.
The impedance values of the channel loads R1, R2, R3 and R4 are 0.5-3 m omega, and the impedance values of the secondary side connecting impedances R5, R6, R7, R8 and R9 are 0.01-0.1 m omega.
The regulating transformer T1 is a step-down transformer, with the primary side being a high-voltage side and the secondary side being a low-voltage side.
The working principle of the power supply device provided by the invention is explained in detail below.
As shown in fig. 3 and 4, the transformer is wired, the primary coil Y is wound on the inner cylinder of the circular iron core C, and the secondary coils E1, E2, E3 and E4 are wound on the outer cylinder of the circular iron core C; primary-side terminals a and B are connected to both ends of the primary coil Y; secondary side ends a1, a2, a3 and a4 are fixed ends and are directly connected to one ends of secondary coils E1, E2, E3 and E4; the other ends b1, b2, b3 and b4 of the secondary side are connected to a guide rail D, a slider H is mounted on the guide rail D, one surface of the slider H is connected with the guide rail, the other surface of the slider H is connected with secondary coils E1, E2, E3 and E4, and the slider H is driven by a servo motor to slide on the guide rail D to adjust the voltage at the two ends of the secondary side.
Let IiI = R1, R2, R3 … … R9 for the current through i;
according to kirchhoff's law, there are
IR4=IR9
IR3=IR8+ IR4= IR8+ IR9
IR2=IR7+ IR3= IR7+ IR8+ IR9
IR1=IR5=IR6+ IR2= IR6+ IR7+ IR8+ IR9
According to the process requirements, IR1=8000A， IR2=4000A， IR3=2000A， IR4=1000A；
The calculation can obtain: i isR9=1000A， IR8=1000A， IR7=2000A， IR6=4000A；
Adjusting T according to the calculated current value as a reference value1And each group of tap voltage on the secondary side of the transformer ensures that the channel current value meets the process requirement.
The primary side of a regulating transformer T1 of the power supply device supplies power directly from a single-phase power supply or a three-phase power supply through a phase-shifting transformer, the secondary side is provided with a plurality of groups of taps, and the current single-loop control single platinum channel is changed into a multi-loop combined control platinum channel by combining the connection of the secondary side and a load; the existing loop current is superposed on secondary side connected impedances R5, R6, R7, R8 and R9, and instead, the loop current is superposed on loads R1, R2, R3 and R4 and secondary side connected impedance R5; the existing loop current superposition adopts phase-difference control on the currents of the secondary side connecting impedances R5, R6, R7, R8 and R9, and instead, the loop current superposition adopts the same phase superposition on the impedances R1/R2/R3/R4 and the secondary side connecting impedance R5, and only the temperature of the secondary side connecting impedance R5 needs to be reduced.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (6)

1. A power supply device of a platinum channel of high-temperature molten glass is characterized by comprising a power supply, a phase-shifting transformer and a regulating transformer T1;
the input end of the phase-shifting transformer is connected with a power supply, the output end of the phase-shifting transformer is connected with the primary side of the regulating transformer T1, at least two groups of sliding taps are arranged on the secondary side of the regulating transformer T1, each group of sliding taps comprises a fixed tapping end and a sliding end, and impedance and load are connected between the fixed end and the sliding end in series.
2. The apparatus of claim 1, wherein the phase-shifting transformer comprises phase-shifting transformers T2, T3 and T4 connected in parallel, and the ratio of the phase-shifting transformers is 1: 1.
3. The power supply device for the platinum channel of the high-temperature molten glass according to claim 1, wherein the number of the sliding taps is four, the fixed ends of the four groups of sliding taps are respectively a1, a2, a3 and a4, and the sliding ends of the four groups of sliding taps are respectively b1, b2, b3 and b 4;
the a1 end connected with the secondary side of the regulating transformer T1 is connected with a resistor R5, a load R1 and a resistor R6 in sequence, and the resistor R6 is connected with the b1 end connected with the secondary side;
the a2 end, the a3 end and the a4 end are respectively connected with the a1 end, the b2 end is sequentially connected with a resistor R7 and a load R2 in series, and the load 2 is connected with the load R1;
the b3 end is connected in series with a resistance R8 and a load R3 in sequence, and the load R3 is connected with a load R2;
the b4 end is connected with the resistance R9 and the load R4 in turn, and the load R4 is connected with the load R32.
4. The power supply device for the platinum channel of the high-temperature molten glass according to claim 3, wherein a load R1 corresponds to a maximum voltage transformation ratio 380:10 of the transformer; the load R2 corresponds to the transformer maximum voltage transformation ratio 380:20, the load R3 corresponds to the transformer maximum voltage transformation ratio 380:30, and the load R4 corresponds to the transformer maximum voltage transformation ratio 380: 40.
5. The apparatus as claimed in claim 3, wherein the impedance values of the loads R1, R2, R3 and R4 are 0.5-3 m Ω, and the impedance values of the loads R5, R6, R7, R8 and R9 are 0.01-0.1 m Ω.
6. The apparatus as claimed in claim 1, wherein the power supply is a single phase power supply or a three phase power supply.
CN201810819985.9A 2018-07-24 2018-07-24 Power supply device for platinum channel of high-temperature molten glass Active CN108947210B (en)

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Publication number Priority date Publication date Assignee Title
CN2158152Y (en) * 1993-03-18 1994-03-02 吴玉臣 Multi-function industrial frequency electric heating pawer supply unit for petroleum
CN202796311U (en) * 2012-07-30 2013-03-13 彩虹显示器件股份有限公司 Multi-tap transformer for heating loop
CN203734546U (en) * 2014-03-19 2014-07-23 国家电网公司 Large-scale power transformer low-frequency heating device based on square wave modulation

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