Flow guiding device for polycrystal ingot-casting furnace

Abstract

The invention discloses a flow guiding device for a polycrystal ingot-casting furnace. The flow guiding device comprises a matching and connecting drum and a flow guiding drum which are axially connected, wherein the matching and connecting drum comprises a hollow matching and connecting drum part and a gas feeding platform part, the drum wall of the matching and connecting drum part is internally provided with a first buffering cavity which is concentric with the matching and connecting drum part and is provided with an opening at the lower end; a gas feeding hole is formed in the gas feeding platform part and is communicated with the first buffering cavity; the drum wall of the upper end part of the flow guiding drum is internally provided with a second buffering cavity which is provided with an opening at the upper end surface and corresponds to the first buffering cavity; the drum wall of the flow guiding drum is internally provided with at least one flow-guiding gas channel which extends downwards from the lower end surface of the second buffering cavity along a cylindrical spiral line, and an outlet of the flow-guiding gas channel is positioned at the lower end part of the flow guiding drum. The flow guiding device disclosed by the invention has a visual field leading into the ingot-casting furnace, and by the flow guiding device, carrier gas is sprayed to liquid silicon in a dispersed manner, so that the contact surface of the carrier gas and the liquid silicon is enlarged, local supercooling caused by the carrier gas and impurity formation enhanced by the carrier gas are reduced; and simultaneously, a rotary flow field is generated in the process that the carrier gas drives the liquid silicon, so that the impurity volatilization is promoted.

Description

[0001] This application is a divisional application with the application number 201610082952.1, the application date is 2016-02-03, and the name is a diversion device for a polycrystalline ingot furnace. technical field [0002] The invention relates to a flow guide device, in particular to a flow guide device for guiding the flow direction of a carrier gas used in a polycrystalline ingot furnace, and belongs to the field of crystal growth equipment. Background technique [0003] The polycrystalline ingot casting furnace 10 is mainly composed of an infrared detector 16, a furnace body 11, a flow guiding device 12, a heat insulation cage 13, a heater 14, and a graphite platform 15, such as figure 1 shown. The flow guiding device 12 includes a graphite tube 123 , a coupling nut 121 and a flow guiding tube 122 . The upper end of the guide tube 122 is provided with an external thread that matches the internal thread of the fitting nut 121, and the upper end of the guide tube 12...

AI Technical Summary

Problems solved by technology

In order to overcome the problems existing in the application of the flow guide device in the prior art: the carrier gas is concentratedly blown on a certain area on the surface of the liquid silicon, and the carrier gas takes away a large amount of heat from this area, causing the local supercooling of the liquid silicon in this area, which promotes The nucleation and growth of impurities in liquid silicon; the field of view leading to the ingot furnace in the diversion device is completely blocked, and the state of the ingot furnace cannot be observed through the observation window through the diversion device, which is inconvenient for the furnace operation; the crystal rod cannot It cannot be inserted into the ingot furnace through the diversion device, and the crystal growth rate is inconvenient to measure; the infrared detector cannot detect the state of the silicon material in the furnace, and the automatic crystal growth process cannot be carried out normally

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