Patent ID: 7665508

Claim:
A heat pipe comprising: a pipe containing phase changeable working media therein, the working media being phase changeable between liquid and vapor, a wick structure being located on an inner face of the pipe, a space being surrounded by the wick structure in the pipe, at least one muzzle with an inlet and an outlet being positioned in space of the pipe, the inlet and the outlet being different in radius thereof, the space being for pass of the vapor in the heat pipe from one end to another end of the heat pipe; wherein the pipe defines an evaporating section, a condensing section and an adiabatic section located between the evaporating section and the condensing section, the inlet of the at least one muzzle extending toward the evaporating section and the outlet of the at least one muzzle extending toward the condensing section; wherein the muzzle is continuously decreasing in radius from the inlet to the outlet and thus has a radius at the inlet larger than a radius at the outlet; wherein the muzzle is located adjacent to a joint of the evaporating section and the adiabatic section, without extending over an entirety of the adiabatic section and without extending into any part of the condensing section.