CN202947347U - Vacuum straight-through jacket-type heat-collecting tube with high emissivity and low air drying temperature - Google Patents
Vacuum straight-through jacket-type heat-collecting tube with high emissivity and low air drying temperature Download PDFInfo
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- CN202947347U CN202947347U CN 201220229489 CN201220229489U CN202947347U CN 202947347 U CN202947347 U CN 202947347U CN 201220229489 CN201220229489 CN 201220229489 CN 201220229489 U CN201220229489 U CN 201220229489U CN 202947347 U CN202947347 U CN 202947347U
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- glass tube
- inner glass
- air drying
- tube
- drying temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The utility model discloses a vacuum straight-through jacket-type heat-collecting tube with high emissivity and low air drying temperature. The heat-collecting tube is manufactured by melting and sealing two ends of an inner glass tube and a cover glass tube, and is characterized in that the outer surface of the inner glass tube is provided with a film layer with emissivity thereof being higher than 0.35, and no film layer is deposited in a 140-degree circumferential angle area on the outer surface of the inner glass tube. As shown in Fig. 1, no film layer is deposited in the 140-degree circumferential angle area on the outer surface of the inner glass tube (2), thus to form a no-coating area (4), and the film layer is deposited in the left area. Sunlight penetrates the cover glass tube (1) onto the film layer of the inner glass tube and then is converted into heat for water inside the tube. During normal heat collection, heat energy radiated by the no-coating area (4) is very small and tolerable. During air drying, surface temperature of the inner glass tube (2) is very high, and radiant heat energy of the no-coating area (4) is large, thereby restraining temperature different between the inner glass tube and the cover glass tube and stress induced by the temperature different.
Description
Technical field
The utility model relates to the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of high emissivity.
Background technology
The logical all-glass vacuum thermal-collecting tube in existing a kind of two, is made of the mode of one section spring glass tube bridge joint at the other end because the excessive stresses that temperature contrast forms adopts cover glass tube and inner glass tube are at one end melted envelope for overcoming inner glass tube and cover glass tube.But spring glass tube bridge joint difficulty is high and easily stop up because of fouling.
Summary of the invention
The purpose of this utility model is to provide the low air drying temperature vacuum of high emissivity straight-through jacket type thermal-collecting tube.
One of the technical scheme in the invention for solving the technical problem: by melt envelope inner glass tube and cover glass tube at two ends, make the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of a high emissivity, inner glass tube outside deposition emissivity is higher than 0.35 rete.
Can also be in inner glass tube outside deposition emissivity higher than 0.45 rete.
Two of the technical scheme in the invention for solving the technical problem: by melt envelope inner glass tube and cover glass tube at two ends, make the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of a high emissivity, inner glass tube outer surface 140 degree angle of circumference zones are depositional coating not.
The beneficial effects of the utility model: the depositional coating not in the subregion of inner glass tube outer surface.Can utilize the emissivity of borosilicate 3.3 glass 92% itself, the further rising of restriction set thermal element air drying temperature.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the composite construction schematic diagram of the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of a high emissivity.
1. cover glass tubes in figure; 2. inner glass tube; 3. vacuum heat-insulating layer; 4. coating film area not.
The specific embodiment
Fig. 1 provides an embodiment of the present utility model.
In Fig. 1, cover glass tube 1 and inner glass tube 2 embed with one heart to be installed, and melt chuck of envelope formation in the two-port alignment, with vacuum heat-insulating layer 3 of interlayer vacuum-pumping formation of described chuck, make the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of a high emissivity.Approximately 140 degree angles of circumference are regional at inner glass tube 2 outer surfaces, the position that namely in figure, the compound cross-section bottom represents with two-wire, and depositional coating forms a not coating film area 4.All the other area deposition selective absorption films at inner glass tube 2.
The operation principle of Fig. 1 embodiment: sunlight passes cover glass tube 1 and be converted to heat energy on inner glass tube 2 rete, and these heat energy pass to the interior water of pipe by the tube wall of inner glass tube 2.During normal thermal-arrest, by inner glass tube 2 not the heat energy of coating film area 4 radiation seldom can ignore or tolerate.During air drying, inner glass tube 2 surface temperatures are very high, at this moment, by emissivity be 92% inner glass tube not the heat energy of coating film area 4 radiation increase.In Fig. 1, the below of compound cross-section represents a large amount of radiation of heat energy with three arrows.This has just limited the excessive rising of air drying temperature, thereby has limited both temperature difference of inner glass tube 2 and cover glass tube 1, and the stress that makes inner glass tube 2 and cover glass tube 1 form because of temperature contrast is restricted.
Coating film area does not deposit the rete of high emissivity, can obtain the effect of similar reduction air drying temperature yet.
Sometimes, anti-air drying requires of crucial importance, at this moment, even the heat collecting element absorptivity is hanged down some and emissivity is high a lot, also can tolerate.The high a lot of absorbing film of described emissivity should have a lot, and a part wherein can directly obtain by adjusting process on existing coating machine.
Claims (2)
1. the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of high emissivity, make by melt envelope inner glass tube and cover glass tube at two ends, it is characterized in that described inner glass tube outer surface contains emissivity higher than 0.35 rete.
2. the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of high emissivity according to claim 1 is characterized in that the inner glass tube outer surface contains emissivity higher than 0.45 rete.
3. the straight-through jacket type thermal-collecting tube of the low air drying temperature vacuum of high emissivity, make with cover glass tube by melt the envelope inner glass tube at two ends, it is characterized in that spending not depositional coating of angle of circumference zone at inner glass tube outer surface 140.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229489 CN202947347U (en) | 2012-05-18 | 2012-05-18 | Vacuum straight-through jacket-type heat-collecting tube with high emissivity and low air drying temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229489 CN202947347U (en) | 2012-05-18 | 2012-05-18 | Vacuum straight-through jacket-type heat-collecting tube with high emissivity and low air drying temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202947347U true CN202947347U (en) | 2013-05-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220229489 Expired - Fee Related CN202947347U (en) | 2012-05-18 | 2012-05-18 | Vacuum straight-through jacket-type heat-collecting tube with high emissivity and low air drying temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202947347U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423894A (en) * | 2012-05-18 | 2013-12-04 | 徐秀萍 | High-emissivity and low-air-drying-temperature vacuum direct connection jacketed type heat collection tube |
-
2012
- 2012-05-18 CN CN 201220229489 patent/CN202947347U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423894A (en) * | 2012-05-18 | 2013-12-04 | 徐秀萍 | High-emissivity and low-air-drying-temperature vacuum direct connection jacketed type heat collection tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20140518 |