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Evacuated collector tube

A vacuum heat collection tube and vacuum technology, applied in the field of heat collection tubes, can solve problems such as broken glass tubes and large temperature differences, and achieve the effect of reducing the heat loss coefficient

Pending Publication Date: 2022-05-27
徐阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above problems, the present invention creatively solves the problem that the glass tube breaks due to the large temperature difference between the inner and outer tubes of the straight-through vacuum heat collecting tube at high temperature, resulting in different expansion and contraction states.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Figures 2(1) to 2(4) The structure of the first preferred embodiment of this case is given.

[0074] The vacuum heat collecting tube in this embodiment 1 includes a vacuum outer tube 21, a vacuum inner tube 22, a vacuum interlayer 23 between the two, and a solar heat collecting layer 24 on the outer surface of the vacuum inner tube 22, and the heat collecting layer 24 is Selective absorption coating on the outer wall of the vacuum inner tube 22 .

[0075] From the cross-sectional view of FIG. 2(2), the heat collecting layer 24 does not completely cover the outer wall of the vacuum inner tube 22, but adopts partial coverage. The coating area 241 and the non-coating area 242 are axially arranged along the outer wall of the vacuum inner tube to form two A sector-shaped area, wherein the central angle corresponding to the sector-shaped area of ​​the non-coated area 242 is shown as θ, and the central angle corresponding to the sector-shaped area of ​​the coated area 241 is...

Embodiment 2

[0084] Figures 3(1) to 3(4) The structure of the second preferred embodiment of this case is given.

[0085] The basic structure of this embodiment is similar to that of Embodiment 1. The vacuum heat collecting tube includes a vacuum outer tube 21, a vacuum inner tube 22, a vacuum interlayer 23 between the two, and a solar heat collecting layer 24 on the outer surface of the vacuum inner tube 22. The heat collecting layer 24 includes two fan-shaped coating areas 241 and a non-coating area 242 .

[0086] The difference from Embodiment 1 is that a reflection unit 26 fixed by a bracket is added in the vacuum interlayer 23 . As shown in the figure, the two ends of the reflection unit 26 are respectively arranged on the outer side of the vacuum inner tube 22 and the inner side of the vacuum outer tube 21 , so as to separate the vacuum interlayer 23 into two areas, and all the coating areas 241 are located in the area separated by the reflection unit 26 . within the same area.

...

Embodiment 3

[0091] Figures 4(1) to 4(4) The structure of the third preferred embodiment of this case is given.

[0092] The structure of this embodiment is similar to that of Embodiment 2, and a reflection unit 26 is also added in the vacuum interlayer 23 of the vacuum heat collector. The difference is that the reflection unit 26 is not fixedly arranged between the vacuum outer tube 21 and the vacuum inner tube 22, but is linked with the movable cover unit 25, that is, the movable heat preservation fins 251 of the movable cover unit 25 are in When the temperature of the vacuum inner tube 22 is too high, or the temperature difference between the vacuum inner tube 22 and the vacuum outer tube 21 is too large, as shown in FIG. 4(3) and FIG. The non-coated area 242 on the surface increases the heat dissipation control temperature, and drives the reflection unit 26 to move around the vacuum inner tube 22 during the opening process, thereby reducing the solar reflection absorption area. When...

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Abstract

The invention provides an evacuated collector tube, which comprises a vacuum outer tube, a vacuum inner tube and a vacuum interlayer between the vacuum outer tube and the vacuum inner tube, and is characterized in that the evacuated collector tube further comprises a solar heat collection layer which is arranged on the outer surface of the vacuum inner tube and comprises a coating area and a non-coating area; and the movable covering unit comprises at least one movable heat preservation fin which is arranged on the outer side of the non-coating area. According to actual tests, the vacuum heat collecting tube plays a role in heat shielding for the vacuum tube through the design of the film coating area, the non-film coating area and the heat preservation fins in the covering state, and has an obvious role in reducing the heat loss coefficient of the heat collecting tube.

Description

technical field [0001] The invention mainly relates to a heat collecting tube, in particular to a vacuum heat collecting tube. Background technique [0002] The vacuum collector tube is the key component of the vacuum collector. The vacuum collector tube has the characteristics of high heat collection efficiency and low cost, and has a wide range of applications in the solar collector market. [0003] like figure 1 , shows a cross-sectional view of a traditional vacuum heat collector tube with a U-shaped cup-shaped structure open on one side. The vacuum heat collector tube is composed of double-layer glass, including a glass inner tube 11 and a glass outer tube 12, a vacuum interlayer 13 is drawn between the two, and the outer wall of the glass inner tube 11 of the vacuum interlayer 13 is coated with a solar endothermic coating layer 14 to improve solar radiation absorption. The glass outer tube 12 is a light-transmitting glass tube, and one end of the heat collecting tu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S10/40F24S10/75F24S80/60
CPCF24S10/40F24S10/75F24S80/60F24S2010/751F24S50/40F24S40/50Y02E10/44
Inventor 徐阳
Owner 徐阳
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