CN101975480B - Solar heat absorption tube - Google Patents
Solar heat absorption tube Download PDFInfo
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- CN101975480B CN101975480B CN2010105286257A CN201010528625A CN101975480B CN 101975480 B CN101975480 B CN 101975480B CN 2010105286257 A CN2010105286257 A CN 2010105286257A CN 201010528625 A CN201010528625 A CN 201010528625A CN 101975480 B CN101975480 B CN 101975480B
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- outer tube
- sealing
- glass outer
- bellows
- becket
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
- F24S40/40—Preventing corrosion; Protecting against dirt or contamination
- F24S40/46—Maintaining vacuum, e.g. by using getters
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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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- 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)
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Abstract
The invention discloses a solar heat absorption tube, which comprises a glass outer tube, a metal inner tube arranged in the glass outer tube and a corrugated tube, wherein a vacuum first annular space is formed between the glass outer tube and the metal inner tube; one end of the corrugated tube is connected with the metal inner tube through an end cover, and the other end of the corrugated tube is connected with a sealing metal ring through a connecting piece; the corrugated tube is in a pre-compressed state and is positioned on the outer side of the end part of the glass outer tube axially; getter devices are annually distributed in a second annular space formed between the sealing metal ring and the metal inner tube; and a light shielding ring is fixed on a connecting piece, and at least part of the light shielding ring extends axially to the first annular space for shielding the sealed part of the sealing metal ring and the glass outer tube. The solar heat absorption tube has the advantages of hydrogen absorbing capacity and convenience of manufacturing and has a high effective utilization rate and long service life.
Description
Technical field
The invention belongs to solar energy heat utilization technical field, particularly a kind of solar energy heat absorption pipe that is applied to the groove type solar collecting system.
Background technology
The trough type solar power generation system is a kind of Solar Energy Heat Utilization System; Its utilization can be followed the tracks of the grooved parabolic mirror of the sun; With the incident light reflect focalization on endothermic tube; The selective absorbing film of metal inner pipe surface-coated absorbs sunshine heating intraductal working medium, produces high pressure, high temperature vapor, the pushing turbine generating.Solar energy heat absorption pipe is the parts of core the most in the trough type solar power generation station.
A kind of high-temperature solar thermal-collecting tube and manufacturing process thereof are disclosed among the Chinese patent ZL200610112005.9; This high-temperature solar thermal-collecting tube comprise metal inner pipe with selective absorption film and around the glass outer tube; Connector is connected bellows with metal inner pipe; Bellows and glass-metal transition piece can cut down directly welding of ring; Can cut down ring again with the sealing-in of glass outer tube, form the vacuum annular space between glass outer tube and the metal inner pipe, be used for reducing heat loss and prevent that selective absorbing film from running into air aging.The general long 4060mm that is of this solar energy heat absorption pipe, operating temperature requires at 300-400 ℃, and intraductal working medium is a high temperature heat conductive oil, and the service life of thermal-collecting tube, general the requirement reached 20 years.Because the conduction oil high temperature ageing can decomposite hydrogen, this hydrogen is assembled in pipe, and hydrogen constantly is penetrated in the vacuum annular space that forms between glass outer tube and the metal inner pipe through metal inner pipe under pressure differential.And along with the rising and the conduction oil of operating temperature constantly decomposes, the hydrogen of vacuum annular space is more and more.At present, in order to keep the vacuum of thermal-collecting tube, the measure of taking generally is to adopt getter; Chinese patent number is to disclose a kind of getter supporting component among the CN1720419A, and it comprises a bridge-shaped object, is formed with elongated groove on the bridge-shaped object; This groove has the getter support section; There is the foot of a plurality of fixed connections to be used for supporting this groove, prevents the reflecting surface of focus irradiation in addition in addition, be used for protecting getter.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art: hydrogen increases in the thermal-collecting tube can sharply increase heat loss, reduces the thermal-collecting tube heat absorption efficiency.In addition, because bellows is thinner, differ greatly with glass-metal transition piece wall thickness, welding is difficulty comparatively, often causes welding to damage or gas leakage.The shortcoming of getter supporting component is that this getter device is placed on the metal inner pipe, and temperature through heat transfer the getter temperature is raise, and getter inevitably can suffer focus irradiation simultaneously, makes the getter heating more than 400 ℃ during metal inner pipe work.Because the pumping property of getter raises with temperature and significantly reduces, efficient reduces when causing the endothermic tube hot operation.
Summary of the invention
The purpose of the embodiment of the invention is the defective to above-mentioned prior art, provides a kind of effective rate of utilization high, long service life, and have hydrogen-absorbing ability and the solar energy heat absorption pipe of being convenient to make.
The technical scheme taked of the present invention is to achieve these goals: a kind of solar energy heat absorption pipe; Comprise the glass outer tube, be arranged on metal inner pipe and bellows in the said glass outer tube; Between said glass outer tube and metal inner pipe, form first annular space of vacuum; One end of said bellows is connected with said metal inner pipe through end cap; The other end of said bellows is connected with the sealing-in becket through connector, and said bellows is an its pre-compressed state, and is presented axially in the outside of said glass outer tube end; Said getter device is distributed on hoop in second annular space of sealing-in becket and metal inner pipe formation; Be fixed with shade on the said connector, said shade at least partly extends in first annular space in the axial direction, is used to block sealing-in place of sealing-in becket and glass outer tube.
Said bellows has 3-8 ripple, and said bellows decrement in advance is 3-20mm.
Said connector is a L type ring-type; Said sealing-in becket is a L type ring-type, the L type lateral ends of said connector and bellows welding, the L type longitudinal end welding of the L type longitudinal end of said connector and said sealing-in becket.
Said getter device has at least one pallet, and said pallet is provided with getter, and said getter is provided with briquetting.
Said pallet is connected on connector or the shade.
Said getter is inhaled the hydrogen agent for the zirconium base.
Said end cap is provided with groove, and said groove is positioned at the inboard of end cap, and said groove is provided with metal exhaust tube.
An end of said glass outer tube is provided with shade, and two ends of said glass outer tube are equipped with bellows and getter device, and the getter device of an end is connected on the connector, on hoop, is distributed in second annular space; The getter device of the other end is connected on connector or the shade, on hoop, is distributed in the 3rd annular space of shade and sealing-in becket formation.
Said shade is L type or broadening formation, and said shade exceeds the sealing-in place 5-30mm of sealing-in becket and glass outer tube in the axial direction, and the surface of described shade scribbles the coating of reflected solar radiation.
Described sealing-in becket and the sealing-in of glass outer tube are two-sided sealings by fusing, and the end of said glass outer tube is a contraction mouth.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: solar energy heat absorption pipe of the present invention has hydrogen-absorbing ability and the advantage of being convenient to make, and the effective rate of utilization of endothermic tube is high, long service life.
Description of drawings
Fig. 1 is the profile of a kind of solar energy heat absorption pipe of providing in the embodiment of the invention;
Fig. 2 is a getter device profile among Fig. 1;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the end cap profile of band metal exhaust tube among Fig. 1;
Fig. 5 is the profile of the another kind of solar energy heat absorption pipe that provides in the embodiment of the invention;
Fig. 6 is for having the shade structural representation of getter device among Fig. 5.
Among the figure: 1 metal inner pipe, 2 glass outer tubes, 3 end caps, 4 bellowss, 5 connectors; 6 sealing-in beckets, 7 getter devices, 8 getters, 9 shades, 10 grooves; 11 metal exhaust tubes, 12 tailpipes, 13 first annular spaces, 14 second annular spaces; 15 the 3rd annular spaces, 16 pallets, 17 briquettings, 18 axially-extending parts.
The specific embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Referring to Fig. 1, a kind of solar energy heat absorption pipe comprises glass outer tube 2, is arranged on metal inner pipe 1 and bellows 4 in the glass outer tube 2; Between glass outer tube 2 and metal inner pipe 1, form first annular space 13 of vacuum; One end of bellows 4 is connected with metal inner pipe 1 through end cap 3, and the other end of bellows 4 is connected with sealing-in becket 6 through connector 5, and bellows 4 is an its pre-compressed state; Glass outer tube 2 axially on, bellows 4 is positioned at the outside of glass outer tube 2 ends; Getter device 7 is distributed on hoop in second annular space 14 of sealing-in becket 6 and metal inner pipe 2 formation; Be fixed with shade 9 on the connector 5, shade 9 at least partly extends in first annular space 13 in the axial direction, and shade 9 is used to block sealing-in place of sealing-in becket 6 and glass outer tube 2.
Bellows of the present invention adopts resistant to elevated temperatures metal; Solar energy heat absorption pipe is because when actual motion; The temperature of working medium is about 400 ℃ in the metal inner pipe; And glass outer tube temperature is about 100 ℃, and the coefficient of expansion of metal inner pipe will be much larger than the coefficient of expansion of glass outer tube, and metal inner pipe is than more than 20 millimeter of the glass outer tube elongation of Duoing.In order to alleviate the differential expansion between the inner and outer pipes, place bellows in glass outer tube end.Bellows is positioned at the outside of glass outer tube end in the axial direction fully, and in order to guarantee its stroke, each bellows has 3 ripples at least.Simultaneously, in order to improve the effective rate of utilization of endothermic tube, reduce the length of bellows; Increase the length of glass outer tube, endothermic tube bellows when assembling is in compressive state in advance all the time, has improved the ability of the alleviation expansion of bellows; The bellows pre compressed magnitude is 3mm at least; Generally can be about 10mm, like this when the endothermic tube hot operation, bellows can return to the original state of not only not having compression but also not having stretching; Can not receive bigger pulling force when making glass outer tube and the sealing-in of sealing-in becket be in high temperature yet, prolong the long service life of endothermic tube.Solar energy heat absorption pipe of the present invention has hydrogen-absorbing ability and the advantage of being convenient to make, and the effective rate of utilization of endothermic tube is high.
Referring to Fig. 1, connector 5 welds with bellows 4 and sealing-in becket 6 for ease, and connector 5 is a L type ring-type; Connector 5 has the part of extending axially 18; Be the L type widthwise edge of connector 5, the L type lateral ends of connector 5 is welded on the bellows 4, and shade 6 is welded on the surface of connector 5; Sealing-in becket 6 is a L type ring-type; The welding of the L type longitudinal end of the L type longitudinal end of connector 5 and sealing-in becket 6 can be welded easily, directly welds comparatively difficult problem owing to wall thickness has big difference with the welding of sealing-in becket thereby solved bellows.Another effect of L type circulus of connector 5 is be used for getter device and shade fixing, avoids arranging too much metalwork in the vacuum space of endothermic tube, thereby reduces cost and reduce the venting source.
Referring to Fig. 2 and Fig. 3; Getter device 7 has a plurality of pallets 16 that are connected to connector; Getter 8 is carried in these pallets 16, and getter 8 can be pie or ring-type, for keep and fixedly getter 8 in pallet 16; Getter device 7 also has briquetting 17, and briquetting 17 is pressed on getter 8 in the pallet 16.Getter device 7 is distributed in first annular space of sealing-in becket and metal inner pipe formation on hoop through a large amount of pallet 16; And be fixed on the connector; Thereby avoided the optically focused direct irradiation; And the operating temperature that makes getter is lower than 200 ℃ all the time, improved the gettering ability of getter greatly, prolongs the service life of endothermic tube.Because the hydrogen that conduction oil decomposes can be penetrated in the vacuum through steel pipe, getter 8 is preferably the zirconium base and inhales the hydrogen agent, and this kind getter can absorb micro-molecular gas, particularly hydrogen.
Referring to Fig. 5; Also can adopt getter device 7 is distributed on hoop in the 3rd annular space 15 of shade 9 and 6 formation of sealing-in becket; Getter device 7 directly is fixed on the outer wall or connector 5 of shade 9; Like this because the irradiate light that shade 9 has stoped the inclination reflect focalization to getter, reduces the getter operating temperature.
Referring to Fig. 1 and Fig. 4, end cap 3 is provided with groove 10, and groove 10 is positioned at the inboard of end cap 3, and groove 10 places can also be provided with metal exhaust tube 11.
When end cap and metal inner pipe weld; The not only convenient welding of the groove design of end cap, weld seam is hidden in the groove more attractive in appearance, and can reduce end cap at the endothermic tube axial length; Increase the length of glass outer tube, further improved the optically focused effective rate of utilization of endothermic tube.The groove of end cap has a metal exhaust tube; Advantage is not only can carry out the exhaust of endothermic tube high-temperature vacuum through this metal exhaust tube; And can after endothermic tube vacuum failure or getter gettering ability reduce, can vacuumize once more, prolong endothermic tube service life.
In order to prevent that the slot type reflective mirror from causing the glass outer tube to burst to glass outer tube and sealing-in place of sealing-in becket the light reflect focalization; Fixing shade on the connector, shade adopts specular material, also can scribble the coating of reflected solar radiation on the surface; Process broadening formation or L type; At least part extends in the annular space of glass outer tube and metal inner pipe formation in the axial direction, and shade so not only can shut out the light and shine sealing-in place at the sealing-in place 5-30mm that exceeds sealing-in becket and glass outer tube in the axial direction; Can with the light reflect focalization to the metal inner pipe of endothermic tube, increase the efficient of endothermic tube simultaneously.
Sealing-in becket and glass outer tube directly carry out sealing by fusing through flame or other mode of heatings, and sealing-in place two sides all is surrounded by glass, forms two-sided sealing-in, can improve the sealing strength and the vacuum-tightness of glass and metal like this.
Participate in Fig. 5,, glass outer tube two ends are all processed reducing, can reduce the diameter of bellows and sealing-in becket like this, thereby practice thrift cost in order to reduce the cost of endothermic tube.
The quantity of getter is placed according to demand on the getter device of the present invention; Can arrange at an end of endothermic tube; Also can all arrange, and every end can arrange at least one circle getter, through a concrete embodiment structure of the present invention is described below at two ends.
Referring to Fig. 1; The structure of solar energy heat absorption pipe comprises glass outer tube 2, the coaxial metal inner pipe that has solar selectively absorbing coating 1 and has the bellows 4 of expansion compensation effect, between glass outer tube 2 and metal inner pipe 1, forms first annular space 13 of vacuum; Glass outer tube 2 is provided with tailpipe 12; Bellows 4 is presented axially in the outside of glass outer tube 2 ends, and bellows 4 adopts 3 ripples, when endothermic tube assembles bellows in advance decrement be 10mm, reduced the length of bellows greatly; One end of bellows 4 is connected with metal inner pipe 1 through end cap 3, and end cap 3 has the groove 10 that the degree of depth is 5mm.As shown in Figure 3; Groove 10 is positioned at end cap 3 inboards; So that end cap 3 welds with metal inner pipe 1; Weld seam just is positioned at groove 10, and the end cap 3 of an end of endothermic tube also is designed with a metal exhaust tube 11 in groove 10, is used for endothermic tube vacuum failure or hydrogen and carries out vacuum exhaust when too much once more; The other end of bellows 4 is connected with sealing-in becket 6 through connector 5; Connector 5 is a L type ring-type; Connector 5 has the part of extending axially 18; Connector 5 is welded on the bellows 4 through extending axially part 18, and the longitudinal component of connector 5 and sealing-in becket 6 weld, and weld so easily; Sealing-in becket 6 is two-sided direct high temperature sealings by fusing with 2 sealing-ins of glass outer tube.Two cover getter devices 7 lay respectively at the endothermic tube two ends; Wherein an end is distributed on hoop in second annular space 14 of sealing-in becket 6 and metal inner pipe 1 formation; The other end is distributed on hoop in the 3rd annular space 15 of shade 9 and 6 formation of sealing-in becket, and the getter device 7 at two ends all is fixed on the connector 5.Getter device 7 has 30 pallets 16 that are connected to connector 5 of a circle, and as shown in Figures 2 and 3, getter 8 just is carried in these pallets, and through briquetting 17 it is pressed in the pallet, and these getters adopt the zirconium base of pie to inhale the hydrogen agent.End at endothermic tube is equipped with shade 9, and this shade surface scribbles the coating of reflected solar radiation, is broadening formation, and shade exceeds glass-to-metal seal place 15mm in the axial direction, extends in first annular space 13 of glass outer tube and metal inner pipe formation.
Referring to Fig. 5, the structure of present embodiment and the structure of Fig. 1 are basic identical, and different is, when endothermic tube assembles bellows in advance decrement be 3mm; End cap 3 has the groove 10 that the degree of depth is 2mm, in order to reduce the cost of endothermic tube, glass outer tube 2 every ends is all processed reducing, can reduce the diameter of bellows 4 and sealing-in becket 6 like this, thereby practices thrift cost; Two cover getter devices 7 lay respectively at the endothermic tube two ends; The getter device 7 of one end is fixed on the connector 5, and the getter device 7 of the other end is directly being fixed on the hoop on the shade 9, and is as shown in Figure 6; Getter device 7 has 40 pallets 16 that are connected to connector 5 of a circle; Getter 8 just is carried in these pallets, and through briquetting 17 it is pressed in the pallet, and these getters adopt the zirconium base of ring-type to inhale the hydrogen agent.End at endothermic tube is equipped with shade 9; Shade 9 surfaces scribble the coating of reflected solar radiation; Shade 9 is the L type, and shade 9 exceeds glass-to-metal seal place 20mm in the axial direction, extends in first annular space 13 of glass outer tube and metal inner pipe formation.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. solar energy heat absorption pipe; Comprise glass outer tube, bellows and be arranged on the metal inner pipe in the said glass outer tube; Between said glass outer tube and metal inner pipe, form first annular space of vacuum, it is characterized in that, an end of said bellows is connected with said metal inner pipe through end cap; The other end of said bellows is connected with an end of sealing-in becket through connector; The other end of sealing-in becket is connected with the glass outer tube, and said bellows is an its pre-compressed state, and is presented axially in the outside of said glass outer tube end; Getter device is distributed on hoop in second annular space that forms between sealing-in becket and the metal inner pipe; Be fixed with shade on the said connector, said shade at least partly extends in first annular space in the axial direction, is used to block sealing-in place of sealing-in becket and glass outer tube.
2. solar energy heat absorption pipe according to claim 1 is characterized in that, said bellows has 3-8 ripple, and said bellows decrement in advance is 3-20mm.
3. solar energy heat absorption pipe according to claim 1 is characterized in that, said connector is a L type ring-type; Said sealing-in becket is a L type ring-type, the lateral ends of said connector and bellows welding, the longitudinal end welding of the longitudinal end of said connector and said sealing-in becket.
4. solar energy heat absorption pipe according to claim 1 is characterized in that said getter device has at least one pallet, and said pallet is provided with getter, and said getter is provided with briquetting.
5. solar energy heat absorption pipe according to claim 4 is characterized in that said pallet is connected on connector or the shade.
6. according to claim 4 or 5 described solar energy heat absorption pipes, it is characterized in that said getter is inhaled the hydrogen agent for the zirconium base.
7. solar energy heat absorption pipe according to claim 1 is characterized in that said end cap is provided with groove, and said groove is positioned at the inboard of end cap, and said groove is provided with metal exhaust tube.
8. solar energy heat absorption pipe according to claim 1; It is characterized in that; Said shade is L type or broadening formation, and said shade exceeds the sealing-in place 5-30mm of sealing-in becket and glass outer tube in the axial direction, and the surface of described shade scribbles the coating of reflected solar radiation.
9. solar energy heat absorption pipe according to claim 1 is characterized in that, described sealing-in becket and the sealing-in of glass outer tube are two-sided sealings by fusing, and the end of said glass outer tube is a contraction mouth.
10. solar energy heat absorption pipe; Comprise glass outer tube, bellows and be arranged on the metal inner pipe in the said glass outer tube; Between said glass outer tube and metal inner pipe, form first annular space of vacuum, it is characterized in that, an end of said bellows is connected with said metal inner pipe through end cap; The other end of said bellows is connected with an end of sealing-in becket through connector; The other end of sealing-in becket is connected with the glass outer tube, and said bellows is an its pre-compressed state, and is presented axially in the outside of said glass outer tube end; An end of said glass outer tube is provided with shade, and said shade is fixed on the connector, and said shade at least partly extends in first annular space in the axial direction, is used to block sealing-in place of sealing-in becket and glass outer tube; Two ends of said glass outer tube are equipped with bellows and getter device, and the getter device of an end is connected on the connector, on hoop, are distributed in second annular space that forms between sealing-in becket and the metal inner pipe; The getter device of the other end is connected on connector or the shade, on hoop, is distributed in the 3rd annular space that forms between shade and the sealing-in becket.
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| CN2010105286257A CN101975480B (en) | 2010-11-01 | 2010-11-01 | Solar heat absorption tube |
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| CN2010105286257A CN101975480B (en) | 2010-11-01 | 2010-11-01 | Solar heat absorption tube |
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| CN101975480A CN101975480A (en) | 2011-02-16 |
| CN101975480B true CN101975480B (en) | 2012-08-08 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519160A (en) * | 2011-12-27 | 2012-06-27 | 皇明太阳能股份有限公司 | Straight-through solar collector tube |
| JP2018076976A (en) * | 2016-11-07 | 2018-05-17 | 株式会社豊田自動織機 | Solar heat collection device |
| JP6686845B2 (en) * | 2016-11-07 | 2020-04-22 | 株式会社豊田自動織機 | Solar heat collector |
| CN107166753B (en) * | 2017-07-06 | 2023-07-18 | 常毅 | Groove type solar vacuum heat collecting tube with inner inserting rod |
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| CN200993488Y (en) * | 2006-12-27 | 2007-12-19 | 章建华 | Metal inner pipe two-way vacuum coated heat collecting pipe |
| CN101135501A (en) * | 2006-08-28 | 2008-03-05 | 中国科学院电工研究所 | High-temperature solar thermal-collecting tube and manufacturing process thereof |
| CN101706167A (en) * | 2009-11-11 | 2010-05-12 | 皇明太阳能集团有限公司 | Expansion compensation device of solar evacuated collector tube and processing technology thereof |
| CN201852333U (en) * | 2010-11-01 | 2011-06-01 | 皇明太阳能股份有限公司 | Solar heat-absorbing pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100126499A1 (en) * | 2008-11-24 | 2010-05-27 | Wei David Lu | Solar Thermal Energy Absorber Tube |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135501A (en) * | 2006-08-28 | 2008-03-05 | 中国科学院电工研究所 | High-temperature solar thermal-collecting tube and manufacturing process thereof |
| CN200993488Y (en) * | 2006-12-27 | 2007-12-19 | 章建华 | Metal inner pipe two-way vacuum coated heat collecting pipe |
| CN101706167A (en) * | 2009-11-11 | 2010-05-12 | 皇明太阳能集团有限公司 | Expansion compensation device of solar evacuated collector tube and processing technology thereof |
| CN201852333U (en) * | 2010-11-01 | 2011-06-01 | 皇明太阳能股份有限公司 | Solar heat-absorbing pipe |
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