CN211595850U

CN211595850U - Outer guide anti-falling structure of single crystal furnace draft tube

Info

Publication number: CN211595850U
Application number: CN201921727874.1U
Authority: CN
Inventors: 周小飞; 郭艳旗; 汪二明
Original assignee: Henan Gcl Photovoltaic Technology Co ltd
Current assignee: Henan Gcl Photovoltaic Technology Co ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-09-29
Anticipated expiration: 2029-10-15

Abstract

The utility model provides a single crystal growing furnace draft tube leads anti-drop structure outward, including interior draft tube and the outer draft tube of going up the border connection, set up the anticreep piece that high temperature resistant metal made on the outer draft tube inner wall, anticreep piece upper end is fixed in the intermediate layer at border on interior draft tube and the outer draft tube, and anticreep piece lower extreme is fixed with the middle part or the lower part of outer draft tube inner wall. The anti-drop piece is a molybdenum piece, the upper part of the molybdenum piece is fixed in the interlayer of the inner guide cylinder and the outer guide cylinder, the lower part of the molybdenum piece is fixed on the inner wall of the outer guide cylinder by adopting a carbon-carbon bolt, and the molybdenum piece is arranged to be tightly attached to the inner surface of the outer guide cylinder; at least one molybdenum sheet is arranged on the outer guide cylinder along the circumference. After the outer guide cylinder has cracks or is broken, the falling part is connected with the broken outer guide cylinder, so that the outer guide cylinder can continue to work and can not fall into the silicon dissolved in the quartz crucible.

Description

Outer guide anti-falling structure of single crystal furnace draft tube

Technical Field

The utility model belongs to silicon rod production facility, concretely relates to anti-drop structure is led outward to single crystal growing furnace draft tube.

Background

The single crystal furnace is a device for producing silicon rods, and a guide cylinder of the single crystal furnace comprises an inner guide cylinder and an outer guide cylinder which can be called as outer guide and inner guide for short. The upper edges of the inner guide cylinder and the outer guide cylinder are detachably fixed together through bolt connection, and the lower parts of the inner guide cylinder and the outer guide cylinder are contacted and not fixed. The existing external conductor is made of graphite and has the advantages of high temperature resistance, small thermal expansion coefficient and the like, but the graphite material belongs to a fragile product, and the graphite external conductor can fall off from the lower edge position after being used for a certain time. The external conductor falls into the quartz crucible to dissolve silicon after falling off, so that the dissolved silicon cannot be used continuously, the loss is large, and the loss of the external conductor falling off each time is roughly calculated to be about 2 ten thousand yuan.

Because of the fragile characteristic of graphite, also there is the experiment and changes outer leading material into carbon material by graphite, nevertheless through long-term trial discovery, carbon is outer leading and can take place the oxidation corrosion serious with lower limb after using a certain time, the phenomenon of sediment is fallen to the bottom in the appearance simultaneously. After falling impurities fall into a quartz crucible to dissolve silicon, the phenomena of difficult crystallization and overproof carbon content can be caused, and the product quality is seriously influenced. So that the carbon-carbon material cannot meet the demand. For the fragile outer conductor of graphite material, a structure for preventing it from falling off is required.

SUMMERY OF THE UTILITY MODEL

The utility model provides a single crystal furnace draft tube external-guiding anti-drop structure with simple structure and low cost.

The purpose of the utility model is realized with the following mode: the anti-drop structure is led outward to single crystal growing furnace draft tube, including interior draft tube and outer draft tube that the top edge is connected, sets up the anticreep piece that high temperature resistant metal made on the outer draft tube inner wall, and anticreep piece upper end is fixed in the intermediate layer at interior draft tube and outer draft tube top edge, and anticreep piece lower extreme is fixed with the middle part or the lower part of outer draft tube inner wall.

The anti-drop piece is a molybdenum piece, the upper part of the molybdenum piece is fixed in the interlayer of the inner guide cylinder and the outer guide cylinder, the lower part of the molybdenum piece is fixed on the inner wall of the outer guide cylinder by adopting a carbon-carbon bolt, and the molybdenum piece is arranged to be tightly attached to the inner surface of the outer guide cylinder; at least one molybdenum sheet is arranged on the outer guide cylinder along the circumference.

Three molybdenum sheets are uniformly distributed on the outer guide cylinder along the circumference.

The utility model has the advantages that: an anti-falling part is fixedly arranged on the inner wall of the outer guide cylinder, and the upper end of the anti-falling part is fixed in the interlayer at the upper edges of the inner guide cylinder and the outer guide cylinder. Therefore, after the outer guide cylinder is cracked or broken, the falling part is connected with the broken outer guide cylinder, so that the outer guide cylinder can continue to work and can not fall into the silicon dissolved in the quartz crucible.

Drawings

Fig. 1 is a prior art draft tube structure.

Fig. 2 shows the anti-falling structure of the outer draft tube of the present invention.

Fig. 3 is a front view of a molybdenum sheet.

FIG. 4 is a left side view of the molybdenum sheet,

Wherein, 1 is an outer guide cylinder, 2 is an inner guide cylinder, 3 is a molybdenum sheet, and 4 is a carbon-carbon bolt.

Detailed Description

As shown in fig. 1-4, an external guide anti-drop structure of a single crystal furnace draft tube comprises an internal draft tube 2 and an external draft tube 1 which are connected at the upper edge. The inner wall of the outer guide cylinder 1 is provided with an anti-falling part made of high-temperature-resistant metal, the upper end of the anti-falling part is fixed in an interlayer at the upper edges of the inner guide cylinder 2 and the outer guide cylinder 1, and the lower end of the anti-falling part is fixed with the middle part or the lower part of the inner wall of the outer guide cylinder 1. The outer draft tube 1 is an outer draft tube, and the main falling position of the outer draft tube 1 is located below the upper edge of the outer draft tube 1, as shown in fig. 1, a is the main falling position of the outer draft tube 1. After the anti-dropping piece is arranged, the outer guide cylinder 1 is cracked or broken, and the dropping piece is connected with the broken outer guide cylinder to enable the outer guide cylinder to continue working and not to drop into the silicon dissolved in the quartz crucible.

The anti-drop piece can be a molybdenum sheet 3, the upper part of the molybdenum sheet 3 is fixed in the interlayer of the inner guide cylinder 2 and the outer guide cylinder 1, the lower part of the molybdenum sheet 3 is fixed on the inner wall of the outer guide cylinder 1 by adopting a carbon-carbon bolt 4, and the molybdenum sheet 3 is arranged close to the inner surface of the outer guide cylinder 1. The molybdenum sheet 3 is positioned in the interlayer of the inner guide shell 2 and the outer guide shell 1. At least one molybdenum sheet 3 is arranged on the outer guide cylinder 1 along the circumference. The molybdenum sheet 3 and the outer guide cylinder 1 are integrated after being fixed by bolts, and the production quality are not affected. Designing an L-shaped molybdenum sheet 3, and forming kidney-shaped holes at two ends of the molybdenum sheet 3; two ends of the molybdenum sheet 3 are fixed by bolts. The original inner and outer guide shell have 3 groups of holes 6, which are fixed together by bolts to form a whole. Theoretically, the positions of the three molybdenum sheets 3 can be three equally divided points of the circle, and in view of reducing the labor consumption and repeated processing caused by punching, 3 of the 6 bolts for fixing the inner guide cylinder and the outer guide cylinder are used as upper fixing bolts of the molybdenum sheets 3, and the lower part of the outer guide cylinder 1 does not have available holes, so that the molybdenum sheets are fixed by punching again. After the molybdenum sheet 3 and the outer guide cylinder 1 are fixed, even if the lower edge of the outer guide cylinder 1 is broken, the broken lower part of the outer guide cylinder 1 cannot fall into the dissolved silicon and still can be suspended above the dissolved silicon under the action of the tensile force of the molybdenum sheet 3 on the inner surface of the outer guide cylinder 1, so that the dissolved silicon is prevented from being scrapped due to graphite pollution. Instead of the molybdenum sheet 3, other high temperature resistant metal sheets may be used. Preferably, three molybdenum sheets 3 are uniformly distributed on the outer guide cylinder 1 along the circumference. The included angle between each molybdenum sheet 3 is 120 degrees. The risk that the outer guide shell 1 falls off can be effectively reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

Claims

1. The outer guide anti-drop structure of the single crystal furnace guide shell comprises an inner guide shell and an outer guide shell which are connected at the upper edge, and is characterized in that: the inner wall of the outer guide cylinder is provided with an anti-falling part made of high-temperature-resistant metal, the upper end of the anti-falling part is fixed in an interlayer at the upper edges of the inner guide cylinder and the outer guide cylinder, and the lower end of the anti-falling part is fixed with the middle part or the lower part of the inner wall of the outer guide cylinder; the anti-drop piece is a molybdenum piece, the upper part of the molybdenum piece is fixed in the interlayer of the inner guide cylinder and the outer guide cylinder, and the lower part of the molybdenum piece is fixed on the inner wall of the outer guide cylinder by adopting a carbon-carbon bolt.

2. The single crystal furnace draft tube external guide anti-falling structure according to claim 1, which is characterized in that: the molybdenum sheet is arranged close to the inner surface of the outer guide cylinder; at least one molybdenum sheet is arranged on the outer guide cylinder along the circumference.

3. The single crystal furnace draft tube external guide anti-falling structure according to claim 2, which is characterized in that: three molybdenum sheets are uniformly distributed on the outer guide cylinder along the circumference.