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

Abstract

A method for manufacturing an all-glass solar heat collecting tube without a tail pipe. The bottom of one end of an inner glass tube plated by a selective absorbing coating layer is rounded, the other end is connected to a first glass outer tube. The bottom of one end of a second glass outer tube is rounded and the other end is flared. The connected inner glass tube/first glass outer tube is inserted into the second glass outer tube. A gap is formed between the first glass outer tube and the second glass outer tube to serve as an air exhausting channel. The first glass outer tube is inserted into the flared opening of the second glass outer tube. The contact point between the first glass outer tube and the second glass outer tube is heated to frit seal and butt joint.

Claims

1. 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, and 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; rounding a bottom of end of a second outer glass tube, and flaring the other end thereof; 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 flaring site of the second 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 first outer glass tube using a mechanical device in the exhaust groove to insert the first outer glass tube into a flared opening of the second 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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of a flaring exhaust structure of a second outer glass tube 2 in a first embodiment;

(2) FIG. 2 is a schematic diagram of a flaring exhaust structure of a first outer glass tube 1 in a second embodiment;

(3) FIG. 3 is a schematic diagram of a structure of an all-glass heat tube type collector tube in a third embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(4) A further detailed illustration on contents of the present invention will be given below in combination with specific embodiments and the accompanying drawings, but the protection scope of the present invention is not merely limited to the following embodiments, and any technical solutions equivalent to the contents of the present invention belong to the protection scope of the present patent.

(5) First Embodiment

(6) Referring to FIG. 1, a method for manufacturing an all-glass solar collector tube without an exhaust tail tube includes the following steps:

(7) (a) rounding the bottom of one end of an inner glass tube 9 plated with selective absorption coating, and sealing a first outer glass tube 1 on the other end thereof, wherein the length of the first outer glass tube 1 is not larger than the length of the inner glass tube 9;

(8) (b) rounding the bottom of one end of a second outer glass tube 2, and flaring the other end thereof;

(9) (c) inserting the inner glass tube 9 sealed with the first outer glass rube 1 into the second outer glass tube 2;

(10) (d) abutting joint, sealing and vacuumizing an exhaust groove 3 of an exhaust platform and the flaring site of the second outer glass tube 2, to form a gap between the first outer glass tube 1 and the second outer glass tube 2 to serve as an exhaust passage;

(11) (e) after vacuumizing and exhausting (when vacuumizing to lower than 10.sup.2Pa), propelling the first outer glass tube 1 by means of a mechanical device 10 in the exhaust groove 3 to insert the first outer glass tube into the flared opening of the second outer glass tube 2, wherein the first outer glass tube 1 is in contact with the second outer glass tube 2;

(12) (f) heating the contact point of the first outer glass tube 1 and the second outer glass tube 2 to achieve the frit seal and butt joint of the first outer glass tube 1 and the second outer glass tube 2.

(13) Second Embodiment

(14) Referring to FIG. 2, a method for manufacturing an all-glass solar collector tube without an exhaust tail tube includes the following steps:

(15) (a) rounding the bottom of one end of an inner glass tube 9 plated with selective absorption coating, sealing a first outer glass tube 1 on the other end thereof, wherein the length of the first outer glass tube 1 is not larger than the length of the inner glass tube, and flaring the other end of the first outer glass tube 1;

(16) (b) rounding the bottom of one end of a second outer glass tube 2;

(17) (c) inserting the inner glass tube 9 sealed with the first outer glass tube 1 into the second outer glass tube 2;

(18) (d) abutting joint, sealing and vacuumizing an exhaust groove 3 of an exhaust platform and the flared opening of the first outer glass tube 1, to form a gap between the first outer glass tube 1 and the second outer glass tube 2 to serve as an exhaust passage;

(19) (e) after vacuumizing and exhausting, propelling the second outer glass tube 2 by means of a mechanical device 10 in the exhaust groove 3 to insert the second outer glass tube into the flared opening of the first outer glass tube 1, wherein the first outer glass tube 1 is in contact with the second outer glass tube 2;

(20) (f) heating the contact point of the first outer glass tube 1 and the second outer glass tube 2 to achieve the frit seal and butt joint of the first outer glass tube 1 and the second outer glass tithe 2.

(21) Third Embodiment

(22) Referring to FIG. 3, a method for manufacturing an all-glass solar collector tube without an exhaust tail tube includes the following steps:

(23) (a) frit sealing a third outer glass tube on an inner glass tube 4;

(24) (b) rounding the bottom of one side close to the frit sealing site of the inner glass tube, vacuumizing, and filling liquid and sealing the other side thereof to obtain a glass heat tube;

(25) (c) plating selective absorption coating on an evaporation segment 5 of the inner glass tube;

(26) (d) inserting the evaporation segment 5 of the glass heat tube into a fourth outer glass tube 6, rounding the bottom of one end of the fourth outer glass tube 6, and flaring the other end thereof;

(27) (e) butting joint and sealing the flaring site of the outer glass tube 6 and an exhaust groove to exhaust, wherein at this time, a gap is reserved between the third outer glass tube 4 and the fourth outer glass tube 6 to serve as an exhaust passage;

(28) (f) after vacuumizing and exhausting, propelling a condensation segment 7 of the inner glass tube by means of a mechanical device 10 in the exhaust groove 3 to insert the third outer glass tube 4 into the flared opening of the fourth outer glass tube 6, wherein the third outer glass tube 4 is in contact with the fourth outer glass tube 6;

(29) (g) heating the contact point of the third outer glass tube 4 and the fourth outer glass tube 6 to achieve the frit seal and butt joint of the third outer glass tube 4 and the fourth outer glass tube 6.