Patent ID: 6230407
Filing Date: 2001-05-15
Classification: F28D,F28F,Y10T

Abstract:
In the production of a heat pipe formed by a container having an outwardly projecting tube portion whose interior defines a gas retaining portion in communication with the interior of the container and into which container a working liquid is injected through an outer end opening of said gas retaining portion prior to closing said opening, said container being heated when said outer end opening of said outwardly projecting tube portion is closed to evaporate the working liquid thereby causing the gas retaining portion to receive noncondensable gases from said container, and a container opening establishing said communication between the interior of said container and the interior of said gas retaining portion being closed, and the gas retaining portion being separated from the container to produce the heat pipe,the method of checking for the existence of non-condensable gases in the container comprising the steps of:measuring the weight of the container prior to removal of the closed gas retaining portion;measuring the weight of the produced heat pipe together with the separated gas retaining portion;comparing the measured weights obtained from conduct of the foregoing steps;determining that the produced heat pipe contains noncondensable gases when no difference in weight measurements is found to exist; anddetermining that the produced heat pipe contains no noncondensable gases when the weight obtained from the second weight measuring step is smaller than that from the first weight measuring step.