Quartz feeding barrel with repeated feeding functions for single crystal furnace

Abstract

The invention discloses a quartz feeding barrel with repeated feeding functions for a single crystal furnace. The quartz feeding barrel comprises a quartz feeding barrel body. A first polytetrafluoroethylene gasket is circularly arranged on the surface of the quartz feeding barrel body, stainless steel reinforcing rings are arranged at the upper end of the quartz feeding barrel body, a second polytetrafluoroethylene gasket is arranged between the stainless steel reinforcing rings, a stainless steel positioning plate is arranged at the upper end of the corresponding stainless steel reinforcingring, a molybdenum draw bar is arranged in the middle of the stainless steel positioning plate, a stainless steel chuck is arranged at the upper end of the molybdenum draw bar, a pin is arranged inside the stainless steel chuck, and a draw bar quartz jacket is arranged on the surface of the molybdenum draw bar. The quartz feeding barrel has the advantages that the quartz feeding barrel is free ofvessel contamination, low in cost and convenient to operate, quartz crucibles can be sufficiently utilized, and the charge amounts of each single quartz crucible can be increased at one step; repeatedfeeding can be carried out according to conditions of the quartz crucibles, the cost of the quartz crucibles can be reduced after feeding is carried out twice, accordingly, the production efficiencycan be greatly improved, the production cost can be reduced, the quartz feeding barrel is easy to operate, and the market competitiveness of products can be improved.

Description

technical field [0001] The invention relates to a feeding device, in particular to a quartz feeding cylinder used for repeated feeding in a single crystal furnace. Background technique [0002] Single crystal furnace is a production device for single crystal silicon used in the production of solar cells. Its operation process is: charging, evacuating, melting, seeding, shouldering, equal diameter, finishing, and furnace shutdown; the production process is to fill the solid silicon raw material in the quartz crucible under vacuum argon, and then heat it to The silicon material is melted, and through the rotation of the seed crystal and the tension between the liquid, it is lifted upwards to produce a single crystal. At present, the crystal pulling basically adopts a one-time feeding method, that is, the silicon material is filled into the quartz crucible at one time before heating. Due to the different shapes and sizes of the silicon material, when the silicon material is pl...

AI Technical Summary

Problems solved by technology

However, the amount of single crystals drawn from a single quartz crucible is small, and the quartz crucible is scrapped after being used once, which accounts for a large proportion of the production cost of single crystals, resulting in high production costs and low production efficiency.

In addition, although some manufacturers have realized the secondary charging of single crystal furnaces, because the secondary charging devices are mostly external devices or container devices, not only limited by the size of raw materials, it is impossible to directly use flake silicon materials (solar energy) Single crystal side leather is a kind of block silicon material), and there are defects such as container pollution, easy blockage during feeding, and high cost of feeding device

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