US 11,739,436 B2
Apparatus and method for continuous crystal pulling
Jun Yang, Shanghai (CN); Weize Shang, Shanghai (CN); and Xiaolong Bai, Shanghai (CN)
Assigned to Jinko Green Energy (Shanghai) Management Co., LTD, Shanghai (CN); and JINKO SOLAR CO., LTD., Jiangxi (CN)
Filed by Jinko Green Energy (Shanghai) Management Co., LTD, Shanghai (CN); and JINKO SOLAR CO., LTD., Jiangxi (CN)
Filed on Sep. 30, 2020, as Appl. No. 17/38,591.
Claims priority of application No. 202010886463.8 (CN), filed on Aug. 28, 2020.
Prior Publication US 2022/0064815 A1, Mar. 3, 2022
Int. Cl. C30B 15/00 (2006.01); C30B 15/02 (2006.01); C30B 15/12 (2006.01); C30B 15/22 (2006.01); C30B 29/06 (2006.01)
CPC C30B 15/002 (2013.01) [C30B 15/005 (2013.01); C30B 15/02 (2013.01); C30B 15/12 (2013.01); C30B 15/22 (2013.01); C30B 29/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus for continuous crystal pulling, comprising:
a crucible including a first sub-crucible and a second sub-crucible located at an inner side of the first sub-crucible, wherein a material feeding space is formed between the first sub-crucible and the second sub-crucible;
a draft tube located above the crucible; and
a delivery duct disposed corresponding to the material feeding space and configured to supply materials into the crucible;
wherein a ratio of an inner diameter of the second sub-crucible to an outer diameter of the draft tube is in a range from 1.09 to 1.3, the outer diameter of the draft tube is in a range from 500 mm to 550 mm, and the inner diameter of the second sub-crucible is in a range from 600 mm to 650 mm,
wherein the draft tube is capable of moving between a first position and a second position, in the first position, a distance between a bottom surface of the draft tube and a bottom surface of the crucible is designated as a first distance, and in the second position, a distance between the bottom surface of the draft tube and the bottom surface of the crucible is designated as a second distance while the delivery duct is adapted to extend into the material feeding space, the first distance is greater than the second distance,
wherein in both the first position and the second position, a distance between the bottom surface of the draft tube and a crystal-liquid interface in the crucible is kept substantially unchanged, and
wherein the draft tube comprises a straight tube portion, and a gap is formed between an inner sidewall of the second sub-crucible and an outer sidewall of the straight tube portion of the draft tube with a width in a range from 50 mm to 150 mm.