Patent ID: 9541336
Date: 2017-01-10
CPC Classifications: F28F

Claim:
1. An evaporation heat transfer tube with a hollow cavity comprises a tube main body; outer fins are arranged at intervals on the outer surface of said tube main body and inter-fin grooves are formed between two adjacent outer fins, wherein said evaporation heat transfer tube with a hollow cavity further comprises at least one hollow frustum structure; said hollow frustum structure is arranged at the bottom of said inter-fin grooves and the said hollow frustum structure is surrounded by side walls; the top of the said hollow frustum structure is provided with an opening; said side walls extend inwards and upwards from the bottom of said inter-fin grooves and thus the area of said opening is less than the area of the bottom of said hollow frustum structure; the inner surface of said side walls and the outer surface of said side walls are intersected at said opening to form a flange.