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Inner intumescence type vacuum thermal-collecting tube

A vacuum heat collector tube and internal expansion technology, which is applied to solar collectors, solar collectors using working fluid, heating devices, etc. Good vacuum, ensure vacuum, reduce the effect of seams

Inactive Publication Date: 2011-05-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of existing heat collecting tubes such as insufficient strength and rigidity, limited length, and large flow resistance, the present invention proposes an internal expansion vacuum heat collecting tube, which not only properly solves the problem of the difference in thermal expansion coefficient between glass and metal, but also has sufficient Strength and rigidity, reliable connection, can maintain long-term sealing

Method used

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Examples

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Embodiment 1

[0024] The internal expansion composite material vacuum heat collecting tube of this embodiment is shown in Figure 1. Its structure is that the glass tube 2 is sleeved on the absorption tube 3, and is sealed by a transitional seal 1. The transitional seal can be made of Kovar alloy. It can also be made of composite materials, as shown in Figure 3, a vacuum layer 6 is formed between the absorption tube 3 and the glass tube 2, and a getter 10 can be placed in the vacuum layer 6 to better maintain the vacuum in the tube Spend. The absorption pipe 3 is a three-layer composite structure, the innermost layer is a composite material, a metal layer is outside the composite material, and a solar heat absorbing coating 5 is outside the metal layer. Compared with the original metal pipe, the composite material of the inner layer has better corrosion resistance, and the compatibility with the working fluid is also greatly improved. The absorption pipe 3 contains a wave expansion joint 7 ...

Embodiment 2

[0026] The internal expansion vacuum heat collecting tube of this embodiment is shown in Figure 2, and its structure is basically the same as that of Example 1, except that the transitional sealing member 1 is a plug, which is sealed and bonded with a high-temperature sealant after it is tightly plugged.

Embodiment 3

[0028] The internal expansion vacuum heat collecting tube of this embodiment is shown in Fig. 9, and its basic structure is the same as that of the above embodiment. The difference is that there is no protective cover outside the absorption tube 3, and the two ends are directly sealed with the end face of the glass tube 2 through transitional seals.

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Abstract

The invention relates to solar collector tube field, and discloses an internal expansion type vacuum collector tube comprising an outer layer glass tube with an absorption tube disposed therein. A vacuum layer in which a degasser is disposed to ensure vacuum degree better is provided between the absorption tube and the glass tube. The absorption tube is connected to the glass tube by a transition sealing-in member. The absorption tube is provided with three-layer composite structure, wherein the inner most layer is composite material, a metal layer is disposed outside the composite material, a solar heat absorption coating is provided outside the metal layer, and the metal layer may be aluminum, carbon steel, stainless steel or copper. The inner layer composite material tube has better corrosion resistance property comparing with metal tubes in prior art, and compatibility thereof with working medium is increased greatly. A corrugated-type expansion joint is provided on the absorption tube to eliminate expansion quantity difference generated by temperature difference better. The composite material layer of the absorption tube can be produced by using carbon fiber composite material or glass fibre composite material.

Description

technical field [0001] The invention relates to the field of solar vacuum heat collecting tubes, in particular to an internally expanding vacuum heat collecting tube. Background technique [0002] The vacuum heat collector is the core device in the solar heat utilization system. The typical structure of the existing vacuum heat collecting tube is as described in Chinese Patent Application No. 95117947. The outer glass tube is set on the metal tube in the middle, and the two ends are sealed and connected. To prevent heat loss, the metal pipe is coated with a heat-absorbing coating to absorb the heat of the sun. The problem in the use of this type of heat collecting tube is: because the expansion coefficient of the metal tube is much larger than that of the glass tube, when the temperature is high, the expansion of the metal tube cannot be digested in the heat collecting tube unit, and it is often necessary to use external expansion joints, etc. Measures lead to complex inst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/05F24J2/48F24S10/40
CPCY02E10/44
Inventor 王军张耀明
Owner SOUTHEAST UNIV
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