Method for manufacturing all-glass solar collector tube without exhaust tail tube

A method for manufacturing an all-glass solar collector tube without an exhaust tail tube, comprising the steps of:

• rounding a bottom of one end of an inner glass tube plated with a selective absorption coating, sealing a first outer glass tube on the other end thereof, wherein a length of the first outer glass tube is not larger than a length of the inner glass tube, and flaring the other end of the first outer glass tube;
• rounding a bottom of one end of a second outer glass tube;
• inserting the inner glass tube sealed with the first outer glass tube into the second outer glass tube;
• abutting joint, sealing and vacuumizing an exhaust groove of an exhaust platform and a flared opening of the first outer glass tube, to form a gap between the first outer glass tube and the second outer glass tube to serve as an exhaust passage;
• after vacuumizing and exhausting, propelling the second outer glass tube using a mechanical device in the exhaust groove to insert the second outer glass tube into the flared opening of the first outer glass tube, wherein the first outer glass tube is in contact with the second outer glass tube;
• heating a contact point of the first outer glass tube and the second outer glass tube to achieve a frit seal and butt joint of the first outer glass tube and the second outer glass tube.

A method for manufacturing an all-glass solar collector tube without an exhaust tail tube, comprising the steps of:

• frit sealing a third outer glass tube on an inner glass tube;
• rounding a bottom of one side close to a frit sealing site of the inner glass tube, vacuumizing, and filling liquid and sealing the other side thereof to obtain a glass heat tube;
• plating a selective absorption coating on an evaporation segment of the inner glass tube;
• inserting an evaporation segment of the glass heat tube into a fourth outer glass tube, rounding a bottom of one end of the fourth outer glass tube, and flaring the other end thereof;
• butting joint and sealing a flaring site of the outer glass tube and an exhaust groove to exhaust, wherein at this time, a gap is reserved between the third outer glass tube and the fourth outer glass tube to serve as an exhaust passage;
• after vacuumizing and exhausting, propelling a condensation segment of the inner glass tube by means of using a mechanical device in the exhaust groove to insert the third outer glass tube into a flared opening of the fourth outer glass tube, wherein the third outer glass tube is in contact with the fourth outer glass tube;
• heating a contact point to achieve a frit seal and butt joint of the third outer glass tube and the fourth outer glass tube.