Filling pipe for use in high-temperature heat pipe filling operation

A filling pipe for use in high-temperature heat pipe filling operation to fill a plurality of alkali metals into a metallic pipe with an end having an opening, the filling pipe comprising:

• an alkali metal filling unit, having:
• a filling body;
• a receiving space disposed in the filling body;
• a feed inlet disposed at a top of the filling body and in communication with the receiving space;
• a feeding pipe disposed at a bottom of the filling body and in communication with the receiving space;
• a first connecting portion disposed at the bottom of the filling body;
• and
• a vacuum-generating component disposed at the filling body and in communication with the receiving space;
• a metallic pipe fixing unit, having:
• a fixing body;
• a taper opening disposed at a bottom of the fixing body and adapted to limit the opening-disposed end of the metallic pipe;
• and
• a second connecting portion disposed at a top of the fixing body and connected to the first connecting portion,
• wherein, when the first connecting portion gets connected to the second connecting portion, the feeding pipe of the alkali metal filling unit is inserted into the opening-disposed end of the metallic pipe;
• a hermetic seal cover separably covering the feed inlet of the alkali metal filling unit;
• and
• a stopping net movably disposed in the receiving space of the alkali metal filling unit.