Shell-and-tube combined heat pipe exchanger

A shell-and-tube combined heat pipe exchanger comprises an upper shell body and a lower shell body, and is characterized in that the upper shell body is provided with a cold medium inlet and a cold medium outlet, a plurality of U-shape or straight tube-shape upper heat pipes are arranged in the upper shell body, and one end of each U-shape or straight tube-shape upper heat pipe is sealed and fixed in a corresponding through hole on an upper pipe board; the shell wall of the lower shell body is provided with a thermal medium inlet and a thermal medium outlet, a plurality of U-shape or straight tube-shape lower heat pipes are arranged in the lower shell body, and one end of each U-shape or straight tube-shape lower heat pipe is sealed and fixed in a corresponding through hole on a lower pipe board; the upper pipe board and the lower pipe board are directly connected or respectively arranged at two ends of a connection drum, a gas-liquid separation exchange space communicating the upper heat pipes and the lower