Abstract: A seed crystal lifting device (100) and a single crystal furnace (200) are provided. The seed crystal lifting device (100) is applied in the single crystal furnace (200), including a frame (1), a cable pipe (4), and a driving component (5). The frame (1) is disposed at a top of the single crystal furnace (200). The cable pipe (4) is movably disposed on the frame (1), and a peripheral wall of the cable pipe (4) is configured to wind a seed crystal rope. The driving component (5) is disposed to the frame (1) and configured to drive the cable pipe (4) to rotate around an axis of the cable pipe (4) and slide along a vertical direction at the same time to wind and lift the seed crystal rope.

Abstract: The present disclosure relates to a single crystal furnace, which includes a main furnace body, an accessory furnace body, a furnace cover, and a driving component. The accessory furnace body is provided with a first connecting member. The furnace cover is provided with a second connecting member. The driving component can drive the first connecting member or the second connecting member to move, so as to match the first connecting member with the second connecting member, and connect the accessory furnace body with the furnace cover.

Abstract: The present disclosure relates to a single crystal furnace, which includes a main furnace body, an accessory furnace body, a furnace cover, and a driving component. The accessory furnace body is provided with a first connecting member. The furnace cover is provided with a second connecting member. The driving component can drive the first connecting member or the second connecting member to move, so as to match the first connecting member with the second connecting member, and connect the accessory furnace body with the furnace cover.

Abstract: A heat exchange device for a single crystal furnace is provided, including a heat exchanger on which an inner chamber for heat exchange defined in a shape of circular truncated cone is formed. A convex portion is defined by a chamber wall of the inner chamber for heat exchange partially projecting along a radial direction of the inner chamber for heat exchange, the convex portion extends along a direction of an axis of the inner chamber for heat exchange, and a minimum distance between an end away from the chamber wall of the inner chamber for heat exchange of the convex portion and the axis of the inner chamber for heat exchange is denoted as L, which is greater than or equal to a minimum radius of a cross section of the inner chamber for heat exchange.