Combination heat dissipation unit

A combination heat dissipation unit comprising:

• a vapor chamber having a lower side wall with a first wick structure provided on an inner surface of the lower side wall and an upper side wall with at least one through hole extending through the upper side wall and with a third wick structure arranged on an inner surface of the upper side wall;
• and the vapor chamber including at least one annular element corresponding to the at least one through hole and the at least one annular element having a single, uniform outer diameter and a single, planar upper end surface, wherein the single, planar upper end surface is arranged in contact with the third wick structure and the at least one annular element having a lower end surface arranged in contact with the first wick structure;
• at least one heat pipe internally defining a heat pipe chamber, which is communicable with the vapor chamber;
• the at least one heat pipe having two ends, one of which is a closed end and another one is an open end, the open end of the at least one heat pipe being correspondingly inserted into the at least one through hole to be structurally supported on the single, planar upper end surface of the at least one annular element;
• the at least one annular element providing axial supporting, locating, and propping to the open end of the at least one heat pipe and thereby giving the combination heat dissipation unit enhanced overall structural strength and defining an airtight chamber;
• and
• a working fluid filled in the airtight chamber, wherein the at least one annular element and the third wick structure guide the working fluid condensed in the at least one heat pipe to flow to the first wick structure in the vapor chamber.