CN101270923A - Vacuum heat collecting tube - Google Patents
Vacuum heat collecting tube Download PDFInfo
- Publication number
- CN101270923A CN101270923A CNA2008100196416A CN200810019641A CN101270923A CN 101270923 A CN101270923 A CN 101270923A CN A2008100196416 A CNA2008100196416 A CN A2008100196416A CN 200810019641 A CN200810019641 A CN 200810019641A CN 101270923 A CN101270923 A CN 101270923A
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- CN
- China
- Prior art keywords
- pipe
- bellows
- metal tube
- glass
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
- F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
- F24S2025/6012—Joining different materials
- F24S2025/6013—Joining glass with non-glass elements
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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
- Y02E10/44—Heat exchange systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to the solar energy technical field, mainly related to a vacuum tube collector, comprising a metal pipe with the surface coated with a solar energy absorption coating layer, wherein a glass pipe is arranged outside the metal pipe; a vacuum layer is arranged between the glass pipe and the metal pipe, and getter can be put in the vacuum layer between the glass pipe and the metal pipe to maintain the vacuum degree; at least one end of the glass pipe is provided with a corrugated metal pipe, one end of the corrugated metal pipe is directly connected and sealed with the glass pipe, and the other end of the corrugated metal pipe is connected with the metal pipe; the joint between the corrugated metal pipe and the metal pipe and the corrugated metal pipe with the glass pipe are both provided with a shield to better protect the connecting joints. The corrugated pipe is made of material with the linear expansion coefficient between the 3 multiplied by 10<-6>/<m/m> degrees to 5 multiplied by 10<-6>/<m/m> degrees. The expansion coefficient is close to that of glass, thereby the corrugated pipe can be directly connected and sealed with the glass pipe arranged outside rather than connected through Kovar, thus reducing the number of the joints, improving the reliability of the pipes and better ensuring the vacuum degree.
Description
Technical field
What the present invention relates to is the solar energy heat collection pipe field, relates generally to the solar energy heat collection pipe field that has bellows.
Background technology
Present domestic glass-metal straight-through type solar energy vacuum heat collecting tube generally adopts and covers solar energy absorbing coating on the metal tube, and the metal tube outer casing glass tube vacuumizes between glass tube and metal tube.In order to compensate the back glass tube that heats up less than the swell increment of metal tube, bellows commonly used comes the compensate for dilatation amount poor, adopts the kovar alloy transition to connect between bellows and the glass.
The patent No. that application on July 25th, 2006 is delivered in retrieval is ZL 200620075347.3, the patent of outer expanded-type solar vacuum heat-collecting pipe by name, thermal-collecting tube comprises the metal tube of surface coverage solar energy absorbing coating, described metal tube is with glass tube outward, form vacuum layer between described glass tube and the metal tube, one end of the bellows that described glass pipe end is outer with being enclosed within metal tube equally is by the kovar alloy sealing by fusing, the other end of described bellows is connected with metal tube, the sealing by fusing interface adds protective cover, and described metal tube is connected by a bellows respectively with the glass tube two ends.This thermal-collecting tube has two major defects: the one, and the glass tube bellows outer with being enclosed within metal tube equally passes through the kovar alloy sealing by fusing, increased operation easier; The 2nd, the formed connection seam of bellows+kovar alloy structure increases, and has increased the difficulty that keeps vacuum.
Summary of the invention
To pass through the kovar alloy sealing by fusing in order to solve being connected of present bellows and glass tube, increase operation easier, connect the many shortcomings of seam, the present invention proposes the direct-connected vacuum heat collection pipe of a kind of bellows and glass tube, this vacuum heat collection pipe can well solve bellows and be connected difficulty with glass tube, the shortcoming that seam is many.
Technical scheme of the present invention is a kind of vacuum heat collection pipe; the metal tube that comprises the surface coverage solar energy absorbing coating; described metal tube is provided with glass tube outward; it between described glass tube and the metal tube vacuum layer; can place getter in the vacuum layer between described glass tube and the metal tube to keep vacuum; at least one end of described glass tube is provided with bellows; described bellows one end and the direct sealing-in of glass tube; the other end of described bellows is connected with metal tube; the interface of described bellows and metal tube and described bellows and glass tube is the peripheral hardware protective cover respectively; connect seam with better protection, described bellows adopts linear expansion coefficient 3 * 10
-6M/m ℃ to 5 * 10
-6M/m ℃ material is made, like this can be directly and the glass tube sealing-in of peripheral hardware because linear expansion coefficient and glass are approaching, do not need to have connected by kovar alloy, and reduced the number of seam, improved the reliability of pipe, can better guarantee vacuum; When adopting single-ended bellows structure, reduced by a bellows especially, and then reduced to connect and stitched.
Described vacuum heat collection pipe, described bellows is connected by flange with metal tube.Between described metal tube and glass tube, also be provided with hold-down support.Also be provided with fin between described metal tube and glass tube, fin is provided with solar absorbing layer, and described fin is cross, screw type or yi word pattern.The other end of described metal tube can also be established a bellows again, and the existence of such two bellowss can better digest the swell increment that inside and outside temperature difference produces.
Beneficial effect of the present invention is: 1. bellows uses linear expansion coefficient and the approaching material manufacturing of glassy phase, with the direct sealing-in of glass tube, does not need to have connected by kovar alloy again, reduces to connect seam, has reduced cost, has improved the reliability of thermal-collecting tube;
2. the stability that is arranged so that whole pipe of hold-down support is improved;
3. the setting of fin has increased the effective area of the solar absorbing layer of metal tube greatly, improved absorption efficiency, and reduced the accuracy of manufacture requirement of concentrator, the weight of whole thermal-collecting tube be can also reduce by the method that reduces the absorption tube caliber, and then the manufacturing and the operating cost of whole system reduced.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of one embodiment of the invention.
Wherein 1 is flange, the 2nd, bellows, the 3rd, glass tube, the 4th, vacuum layer, the 5th, metal tube, the 6th, fin, the 7th, solar absorbing layer, the 8th, hold-down support, the 9th, protective cover, the 10th, getter.
Fig. 2 is the schematic diagram of the embodiment of spiral fins.
Fig. 3 be among Fig. 1 A to enlarged drawing.
Fig. 4 be among Fig. 1 B to cutaway view.
Fig. 5 be among Fig. 1 C-C to cutaway view Amplified image.
The specific embodiment
Vacuum heat collection pipe as shown in Figure 1; the metal tube 5 that comprises surface coverage solar energy absorbing coating 7; the described metal tube 5 outer glass tubes 3 that are provided with; be vacuum layer 4 between described glass tube 3 and the metal tube 5; can place getter 10 in the vacuum layer 4 between described glass tube 3 and the metal tube 5 to keep vacuum; the two ends of described glass tube 3 are provided with bellows 2; can certainly be only therein an end be provided with bellows 2; described bellows 2 one ends and glass tube 3 direct sealing-ins; the other end of described bellows 2 is connected with metal tube 5; the interface of described bellows 2 and metal tube 5 and described bellows 2 and glass tube 3 is peripheral hardware protective cover 9 respectively; connect seam with better protection, described bellows 2 adopts linear expansion coefficient 3 * 10
-6M/m ℃ to 5 * 10
-6M/m ℃ material is made, like this can be directly and the glass tube sealing-in of peripheral hardware because linear expansion coefficient and glass are approaching, as shown in Figure 3, do not need to have connected by kovar alloy, reduced the number of seam, improve the reliability of pipe, can better guarantee vacuum, and the temperature that interface can Nai Genggao; When adopting single-ended bellows structure, reduced by a bellows especially, and then reduced to connect and stitched.Bellows 2 is connected with metal tube by flange 1 as shown in Figure 1, forms the sealing structure of flange 1+ bellows 2+ glass tube 3, and bellows 2 also can directly be connected with metal tube certainly, can realize by welding, as shown in Figure 2.Also be provided with fin 6 between metal tube 5 and glass tube 3, it can be yi word pattern, cross or screw type as shown in Figure 2 that solar absorbing layer 7, fin are also arranged on the fin 6.For the stability that increases whole thermal-collecting tube can also install the hold-down support 8 that is supported between metal tube 5 and the glass tube 3 additional outside metal tube 5, make metal tube 5 and glass tube 3 more reliable location.As shown in Figure 4 and Figure 5, this hold-down support 8 can be to be made of circular arc supporting seat, elasticity support sheet, the head of conflicting, the arc radius of circular arc supporting seat and metal tube external diameter match, be fixed on outside the metal tube, elasticity support sheet is by stretching to both sides on the circular arc supporting seat, and the conflict head by the end is resisted against in the glass outer tube locatees.During assembling, two one group of support member is separately fixed at metal tube bilateral symmetry place.Protective cover 9 is contained in outside the seam of bellows 2 and glass tube 3 and metal tube 5, can prevent the focused ray direct irradiation at interface, prolongs the life-span of thermal-collecting tube.
During work, speculum reflects sunshine, makes light see through vacuum between glass tube and metal tube, is radiated on the metal tube and fin that is coated with solar energy absorbing coating, after coated surface absorbs, and the working medium in the heating metal pipe.Because the existence of fin 6 has improved the effective absorbing area of solar energy, reduced manufacturing requirement simultaneously, obtained using under the prerequisite of identical energy the present invention can adopt the littler metal tube of diameter, effectively reduced overall weight concentrator, saved material, made installation more convenient.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (9)
1. vacuum heat collection pipe, comprise that the surface is provided with the metal tube of solar absorbing layer, outside described metal tube, be provided with glass tube, it between described glass tube and the metal tube vacuum layer, at least one end of described glass tube is provided with bellows, and described bellows one end is connected with glass tube, and the other end is connected with metal tube, the junction of described bellows and metal tube and described bellows and glass tube is the peripheral hardware protective cover respectively, and it is characterized in that: described bellows one end and glass tube directly are tightly connected.
2. vacuum heat collection pipe as claimed in claim 1 is characterized in that described bellows adopts linear expansion coefficient 3 * 10
-6M/m. ℃ to 5 * 10
-6M/m. ℃ material is made.
3. vacuum heat collection pipe as claimed in claim 1 is characterized in that described bellows is connected by flange with metal tube.
4. vacuum heat collection pipe as claimed in claim 1 is characterized in that also being provided with between described metal tube and the glass tube hold-down support.
5. vacuum heat collection pipe as claimed in claim 1 is characterized in that also being provided with fin between described metal tube and the glass tube, and fin is provided with solar absorbing layer.
6. vacuum heat collection pipe as claimed in claim 5 is characterized in that described fin is cross.
7. vacuum heat collection pipe as claimed in claim 5 is characterized in that described fin is a screw type.
8. vacuum heat collection pipe as claimed in claim 5 is characterized in that described fin is a yi word pattern.
9. as the arbitrary described vacuum heat collection pipe of claim 1～5, it is characterized in that the other end of described metal tube also is provided with bellows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100196416A CN101270923A (en) | 2008-03-11 | 2008-03-11 | Vacuum heat collecting tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100196416A CN101270923A (en) | 2008-03-11 | 2008-03-11 | Vacuum heat collecting tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101270923A true CN101270923A (en) | 2008-09-24 |
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ID=40005051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100196416A Pending CN101270923A (en) | 2008-03-11 | 2008-03-11 | Vacuum heat collecting tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101270923A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011039281A3 (en) * | 2009-09-29 | 2012-04-12 | Schott Solar Ag | Absorber pipe |
| CN102135337B (en) * | 2010-01-21 | 2013-02-13 | 淄博运特能源科技有限公司 | Mechanical sealing device for medium and high temperature straightway heat collecting pipe |
| US20130228166A1 (en) * | 2009-12-04 | 2013-09-05 | Schott Solar Ag | Absorber tube |
| CN103940126A (en) * | 2014-04-14 | 2014-07-23 | 浙江大学 | Natural circulation solar loop type heat collecting pipe based on heat transfer modified surface and method |
| CN108204683A (en) * | 2017-12-25 | 2018-06-26 | 北京有色金属研究总院 | A kind of solar vacuum heat-collecting pipe heat-insulated hood of high temperature resistant high reflection |
-
2008
- 2008-03-11 CN CNA2008100196416A patent/CN101270923A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011039281A3 (en) * | 2009-09-29 | 2012-04-12 | Schott Solar Ag | Absorber pipe |
| EP2581684A3 (en) * | 2009-09-29 | 2014-02-26 | SCHOTT Solar AG | Absorber pipe |
| US9939176B2 (en) | 2009-09-29 | 2018-04-10 | Rioglass Solar Holding, S.A. | Absorber pipe |
| US20130228166A1 (en) * | 2009-12-04 | 2013-09-05 | Schott Solar Ag | Absorber tube |
| US9404674B2 (en) * | 2009-12-04 | 2016-08-02 | Schott Ag | Absorber tube |
| EP2507563B1 (en) * | 2009-12-04 | 2017-02-08 | Schott Solar AG | Absorber tube |
| CN102135337B (en) * | 2010-01-21 | 2013-02-13 | 淄博运特能源科技有限公司 | Mechanical sealing device for medium and high temperature straightway heat collecting pipe |
| CN103940126A (en) * | 2014-04-14 | 2014-07-23 | 浙江大学 | Natural circulation solar loop type heat collecting pipe based on heat transfer modified surface and method |
| CN108204683A (en) * | 2017-12-25 | 2018-06-26 | 北京有色金属研究总院 | A kind of solar vacuum heat-collecting pipe heat-insulated hood of high temperature resistant high reflection |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080924 |