Device for cooling silicon core drawing area during silicon core drawing

Abstract

The invention discloses a device for cooling a silicon core drawing area during silicon core drawing, which relates to the field of artificial crystals. A cooling liquid passage cools the lower surface of a gate valve; the use reliability of the gate valve is further improved; the service life of the gate valve is effectively prolonged; a throttle valve (10) is arranged at the air inlet end of each air blowing pipe (3); the air blowing amount of the drawing holes with different crystallization temperatures can be adjusted; therefore, the crystallization temperature of each crystallization areacan be ensured to be consistent; the simultaneous drawing of a plurality of silicon cores is further realized; the quality of the silicon core is effectively ensured; the rapid and uniform cooling ofthe silicon core can improve the drawing speed of the crystal and increase the diameter of the drawn silicon core, and the diameter of the silicon core is increased, so that the growth speed of the silicon core in the reduction furnace in the later period is increased, the production efficiency is improved, and the device has the advantages of simple structure, good use effect and the like, and is suitable for large-scale popularization and application.

Description

【Technical field】 [0001] The invention relates to the field of artificial crystals, in particular to a device for cooling a silicon core drawing area during silicon core drawing. 【Background technique】 [0002] It is known that in the process of preparing silicon cores, seed crystals are generally used for seeding, and the silicon cores are drawn after the seeding is completed. During this process, the seed crystal needs to be held by the seed chuck. After the high-frequency coil partially melts the end of the raw material rod into liquid, the seed chuck drives the seed crystal down, passes through the drawing hole of the high-frequency coil and inserts it into the solution at the upper end of the raw material rod, and then drives the seed crystal down through the seed chuck. The seed crystal rises, and the seed crystal drives the solution to rise and recrystallize, eventually forming a silicon core of the desired length. [0003] As the seed crystal rises with the melt, t...

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Problems solved by technology

[0006] Although the above-mentioned patent application solves the problem of slow crystallization speed of the silicon core, the gas flow rate of each blowing tube cannot be adjusted during the process of drawing the silicon core (that is, the blowing volume of each blowing tube is the same), because each The temperature of the drawing hole corresponding to the blowing pipe is inconsistent. When the blowing volume is the same, the crystallization speed of the newly drawn silicon core will be inconsistent, which will affect the quality of the silicon core. In severe cases, some silicon cores will be scrapped, etc.

The most important thing is that the above-mentioned patents cannot cool the flapper valve at the same time, so how to provide a device for cooling the silicon core drawing area during silicon core drawing has always been a long-term technical demand of those skilled in the art

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