Dual-pipe butting structure of solar energy heat collecting pipe and method

Abstract

The invention provides a dual-pipe butting structure of a solar energy heat collecting pipe and a method. The dual-pipe butting structure is formed by the welding of an annular sealing opening of thebody part of an inner pipe and a nozzle of a hood glass pipe, wherein the part in the hood glass pipe, of the inner pipe is a heat absorption section; the part extending outside the hood glass pipe, of the inner pipe is a condensing section; a convex ring is formed in a position of the annular sealing opening of the inner pipe; the nozzle of the hood glass pipe is in smooth connection with the convex ring, so that the outer wall of the nozzle of the hood glass pipe is connected with the outer wall of the condensing section in a manner that the inclination angle of the outer wall of the nozzleof the hood glass pipe and the outer wall of the condensing section is 120-150 degrees; and the wall thickness at a joint of the inner pipe and the condensing section is reduced to 60%-90% of the wallthickness of the straight pipe part of the inner pipe and the condensing section. Through the adoption of the dual-pipe butting structure disclosed by the invention, economy and reliability of mounting of a whole-glass heat pipe type vacuum solar energy heat collecting pipe are substantially improved, and the generation of mounting breakage and mounting accidents is effectively reduced, so that the mounting breakage rate of the whole-glass heat pipe type vacuum solar energy heat collecting pipe is effectively reduced from 1.2% to 0.05%, and the system efficiency is effectively improved.

Description

technical field [0001] The invention relates to a solar heat collecting tube, in particular to a double-pipe butt joint structure and method of an all-glass heat pipe vacuum solar heat collecting tube with a gradient structure. Background technique [0002] The all-glass vacuum solar collector tube has been developed for more than 30 years, forming the field of solar thermal utilization, and has been widely used in solar hot water applications. [0003] The all-glass heat-pipe solar collector tube adopts phase-change heat technology, and there is no water in the tube, which solves the problem of low startup speed, low thermal efficiency, and easy scaling or freezing caused by water in the ordinary all-glass vacuum heat collector tube. question. It has achieved the characteristics of anti-scaling, anti-freezing, damage and leakage prevention, and has gradually been accepted by the solar thermal heating market, and has begun to promote demonstration applications. [0004] At...

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Problems solved by technology

[0008] In order to solve the step problem and stress concentration problem of the existing all-glass heat pipe vacuum heat collector at the joint of the double pipes, this will affect whether the current all-glass heat pipe solar heat collector can be widely used in solar thermal heating, and affect the following To solve the problem of whether the solar thermal heating system with the all-glass heat pipe solar collector tube as the core can be widely marketed, this invention proposes a double-pipe docking structure and method for solar collector tubes

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