Crystalline silicon ingot casting furnace

Abstract

The embodiment of the invention discloses a crystalline silicon ingot casting furnace. The ingot casting furnace comprises a furnace body, a crucible, a crucible bottom plate, a cooling block, a flow guide pipe and a silicon liquid overflow detection wire, wherein the crucible is arranged in the furnace body; the crucible bottom plate is arranged below the bottom of the crucible; a plurality of flow guide holes are formed on the crucible bottom plate and pass through the crucible bottom plate; the cooling block is positioned below the crucible bottom plate; at least one flow guide groove is formed on the cooling block; the flow guide pipe is arranged below the cooling block; the flow guide groove is communicated with the flow guide holes and the flow guide pipe; the silicon liquid overflow detection wire is arranged at the upper end, near the cooling block, of a cavity channel of the flow guide pipe; and the silicon liquid overflow detection wire is connected with a silicon liquid overflow control device arranged outside the ingot casting furnace. According to the technical scheme, a silicon liquid overflow problem can be detected and solved timely; and the silicon liquid overflow route is single and controllable, the polluted area is small and the safety is high.

Description

technical field [0001] The invention relates to the technical field of solar cell manufacturing technology, and more specifically, relates to a crystalline silicon ingot furnace. Background technique [0002] When casting crystalline silicon ingots, the silicon material is placed in a quartz crucible, and after vacuuming, high-temperature melting, crystal growth, annealing, cooling and other processes in the ingot casting furnace, crystalline silicon ingots with high purity are finally formed. During the production process, the silicon liquid overflow problem may occur due to the rupture of the quartz crucible and other reasons. Once the silicon liquid overflow problem is not dealt with in a timely and effective manner, the overflowing high-temperature silicon liquid will accumulate at the bottom of the furnace body. Burn through the steel plate of the furnace body, thus causing catastrophic accidents. Therefore, special silicon liquid overflow protection devices need to be...

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Problems solved by technology

However, as figure 1 As shown in , the silicon liquid overflow detection wire 8 is arranged in the adapter 7 at the bottom of the furnace body 1. The distance between the installation position of the silicon liquid overflow detection wire 8 and the silicon liquid leakage point is too large. When the quartz crucible 2 accidentally ruptures the silicon liquid 15 When an overflow occurs, the alarm device can only be activated when the silicon liquid flows into the adapter 7 at the bottom of the furnace body. The overflow detection of the silicon liquid is delayed, and the accident alarm cannot be issued in time, which leads to a delay in the treatment of the silicon liquid overflow; The circulation path is messy and the polluted area is large, such as figure 1 There is accumulation of silicon liquid on the bottom of the middle furnace body, the bottom plate of the heat preservation crucible and in the adapter

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