Patent ID: 8936433
Filing Date: 2015-01-20
Classification: F04D

Abstract:
1. An anti-relief fan frame body structure comprising: a frame body having a receiving space, a top portion, a bottom portion and a shaft seat received in the receiving space, the receiving space having a wind inlet side and a wind outlet side opposite to the wind inlet side, the wind inlet side and the wind outlet side together defining the receiving space, the top portion and the bottom portion being in adjacency to the wind inlet side and the wind outlet side, respectively, the bottom portion comprising a stop backflow inclined surface, the shaft seat being in adjacency to the wind outlet side and having a base section and a bearing cup, the bearing cup being axially extending from the base section for rotatably fitting with a fan impeller with a plurality blades, the frame body further having multiple flow guide members extending from a circumference of shaft seat to an inner circumference of the frame body to connect with the inner circumference of the frame body; and multiple anti-relief sections disposed on the inner circumference of the frame body between the flow guide members and comprising a flat surface and a slant surface, the flat surface below the blades of the fan impeller, the slant surface being connected with the stop backflow inclined surface; and wherein the stop backflow inclined surface is upward obliquely extending from an edge of the bottom portion of the frame body toward the receiving space below the blades; and wherein ends of the blades facing the inner circumference of the frame body do not correspond to the anti-relief sections, and the anti-relief sections are positioned under the blades.