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Line focusing solar vacuum heat-collecting tube sealing structure and unloading device

A technology of vacuum heat collector tube and unloading device, which is applied in the direction of solar thermal device, solar collector, solar collector safety, etc., can solve problems such as gaps

Inactive Publication Date: 2008-10-22
中金盛唐新能源科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many patented technologies related to metal straight-through pipes in China. The main difference lies in the structural differences. The technical solutions tend to be consistent. There is a clear gap between performance research and processing technology research and foreign countries

Method used

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  • Line focusing solar vacuum heat-collecting tube sealing structure and unloading device
  • Line focusing solar vacuum heat-collecting tube sealing structure and unloading device
  • Line focusing solar vacuum heat-collecting tube sealing structure and unloading device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: direct fusion sealing method

[0029] Select iron-nickel kovar alloy and glass outer tube with the same linear expansion coefficient. Firstly, the iron-nickel kovar alloy part 4 is stamped and formed into a spherical head or a tubular part with grooves. After atomization treatment, it is placed on a fixture or In the mold cavity, the end of the glass outer tube 1 is set on the exposed spherical tubular part of the Kovar alloy part 4, and the glass is melted with flame on a glass lathe or a rotary workbench, or the method of static sealing in the mold cavity can also be adopted , after the iron-nickel kovar alloy 4 and the glass outer tube 1 are fully welded, heat treatment according to the glass operation regulations, annealing and stress relief, and then used as a component for standby. The metal end cover 3 is stamped and made into a central concave-shaped opening end cover, the two ends of the unloading device bellows 4 are welded with pipe joints 7, th...

Embodiment 2

[0030] Embodiment 2: Indirect fusion sealing method

[0031] Select iron-nickel kovar alloy 4 with the same linear expansion coefficient, low-melting glass-ceramic sealing material 6 and glass outer tube 1, and iron-nickel kovar alloy part 4 is stamped and made into different convex ring parts in the inner circle, and the outer glass tube 1 The end is processed into a glass flange of the same shape slightly larger than the iron-nickel Kovar alloy part 4, and the low-melting glass-ceramic sealing material 6 is evenly coated on the atomized iron-nickel Kovar alloy part 4 and glass On the sealing surface of the outer tube 1, the opening is placed upwards in a high-temperature furnace for welding, and after full welding, it is heat treated according to the glass operation regulations, annealed and stress-relieved, and then used as a component for standby use. The metal end cover 3 is stamped and made into a central concave-shaped opening end cover, the two ends of the unloading de...

Embodiment 3

[0033] Using the inner glass flange processing method, first cut the glass outer tube 1, process the inner sealing surface of the bell mouth flange with the opening inward at the end of the glass outer tube 1, and process the iron-nickel kovar alloy part 4 into an enlarged end of the same shape. For the tubular piece with a bell mouth, glass sealing materials 6 are respectively placed between the atomized iron-nickel kovar alloy piece 4 and the contact surface of the glass flange, and are welded in a static high-temperature environment. Since the iron-nickel kovar alloy part 4 is installed in the flange of the glass outer tube 1, it can bear greater axial stress from the thermal expansion of the metal inner tube, which is more conducive to stabilizing the unloading structure. Others are the same as before. Such as Figure 9 shown.

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Abstract

The invention relates to a seal structure of a line-focusing solar vacuum heat collecting pipe and various material options and constructions of an unloading device. After swelling coefficient of a glass pipeline is adjusted rationally and an iron-nickel kovar alloy material is configured, a direct smelting seal is realized by means of hot melt; an iron-nickel kovar member and a glass outer pipe adopt a new annular structure design to realize indirect heat sealing; the unloading device arranged inside of a heat collecting pipe and an improved connecting method are favorable for improving stability and reliability of the line-focusing solar vacuum heat collecting pipe; a plurality of structure combinations are further favorable for processing and manufacturing through using the prior solar vacuum heat collecting pipe production technology and equipment. The line-focusing solar vacuum heat collecting pipe made by the invention can be widely applied to solar medium-high temperature heat collecting devices for groove-type solar heat power generation, solar air-condition refrigeration and solar seawater desalination and so on.

Description

technical field [0001] The invention relates to a sealing structure and an unloading device for a trough-type wire-focusing metal runner solar vacuum heat collecting tube, belonging to the technical field of solar heat utilization. Background technique [0002] Line-focusing solar collector tubes are the main collector elements in solar thermal utilization systems such as solar thermal power generation, solar air conditioning and refrigeration, and solar desalination. Due to the high temperature of the working fluid, the thermal expansion of the metal inner tube, and the glass-to-metal sealing technology, the line-focused solar heat collector has relatively high requirements for the design structure and manufacturing process. The improved ZL200420091975.1 and ZL200620113317.7 patents of solar vacuum collector tubes with internal and external unloading functions focus on solving the problem of the influence of thermal expansion on the structure of the metal inner tube. It has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/05F24J2/24F24S10/40F24S10/70
CPCY02E10/44F24J2/4636F24J2/055F24S10/45F24S40/80Y02A20/142
Inventor 张建城
Owner 中金盛唐新能源科技(北京)有限公司
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