Outer glass pipes for solar heat collector pipes

摘要

An outer glass pipe for a solar heat collector pipe includes an outer glass pipe body formed of a straight glass pipe being open at both ends and a lid member provided therein with a small diameter opening. An exhaust pipe of a small diameter is attached to the lid member to form a bottom member. The bottom member is air-tightly fixed to one open end of the outer glass pipe body on its peripheral edge to close one of the open ends.