CN201561587U - Expansion compensation device of solar vacuum collector tube - Google Patents
Expansion compensation device of solar vacuum collector tube Download PDFInfo
- Publication number
- CN201561587U CN201561587U CN2009202469723U CN200920246972U CN201561587U CN 201561587 U CN201561587 U CN 201561587U CN 2009202469723 U CN2009202469723 U CN 2009202469723U CN 200920246972 U CN200920246972 U CN 200920246972U CN 201561587 U CN201561587 U CN 201561587U
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- glass
- outer tube
- expansion
- tube
- compensation device
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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 provides an expansion compensation device of a solar vacuum collector tube and relates to the solar power vacuum collector tube. The expansion compensation device is arranged between a metal inner tube and a glass outer tube and comprises a corrugated tube sleeved on the outer portion of the metal inner tube. One end of the corrugated tube is fixedly connected with the metal inner tube via a connector, and the other end of the corrugated tube is fixedly connected with the glass outer tube via a glass-metal transition component. The expansion compensation device is applicable under medium-high temperature and has the advantages of simple structure and fine gas tightness.
Description
Technical field
The utility model relates to focusing type solar thermal utilization vacuum heat collection pipe field, and more particularly, the utility model relates to a kind of expansion compensation device of solar vacuum heat-collecting pipe.
Background technology
Solar energy is most important basic power source in the various regenerative resources, it have aboundresources, inexhaustible, nexhaustible, do not pollute the environment and destroy advantages such as the ecological balance.The today of therefore reduce year by year at fossil fuel, the international energy situation is severe day by day, development and use solar energy is one of important channel of realizing energy supply diversification, assurance energy security.Focusing on the type solar vacuum heat-collecting pipe and can be applied in industry heating and power field, is the important development direction of following solar energy optical-thermal industry, and the quality of its performance is directly connected to the speed of following photo-thermal industry development.
Solar vacuum heat-collecting pipe is generally by the metal inner pipe of surface-coated or sputter solar selective absorbing coating and form around the glass outer tube of metal inner pipe.Between glass outer tube and the metal inner pipe by vacuumizing to reduce heat loss, but the difference of and the coefficient of expansion different with the metallic surface temperature owing to glass in the thermal-collecting tube need be provided with the expansion compensation device and alleviate vertical thermal expansion stress between glass outer tube and metal inner pipe.
At present, existing expansion compensation device has two types.
One is to adopt flange directly to support stressed pressuring method, with glass-to-metal seal together.Its processing technology is to adopt the hot pressing encapsulation method of solid-state welding, is scolder with lead, and sealing temperature is 0.7-0.9 a times of lead welding fusing point.Because this kind structure belongs to non-matching pressure sealing-in, so warm field in can only being applied in, under the condition of high temperature, air-tightness is not good enough.
Its two, be to adopt bellows as compensation, specifically between glass outer tube and metal inner pipe, bellows is set.Bellows also is made of metal.This expansion compensation device specifically is provided with inside and outside two-layer hermetically-sealed construction at metal and glass sealing place, and internal layer uses binding agent and sealant to be bonded and sealed, and the outer pressure differential that relies on closely is pressed on rubber seal on the glass tube.This kind structure is in the process complex process, and finished product also can only be applied in warm field, under the condition of high temperature, its bonding strength and air-tightness can reduce, and can directly influence the serviceability of product.
Summary of the invention
The purpose of the utility model embodiment is the defective at above-mentioned prior art, and a kind of expansion compensation device of solar vacuum heat-collecting pipe is provided, temperature and high temperature and have advantage simple in structure, that air-tightness is good during described device is applicable to.
The technical scheme taked of the utility model embodiment is to achieve these goals: a kind of expansion compensation device of solar vacuum heat-collecting pipe, be arranged between metal inner pipe and the glass outer tube, comprise the bellows that is set in the metal inner pipe outside, one end of described bellows is fixedlyed connected with metal inner pipe by connector, and the other end of described bellows is fixedlyed connected with the glass outer tube by the glass metal transition piece.
In order to guarantee bonding strength and the bubble-tight designs simplification of accomplishing simultaneously, the part of described glass metal transition piece be socketed on the outer wall of described glass outer tube and with the contacted outer wall single face of described glass outer tube sealing by fusing.
In order to stop slot light collection to reflex to sealing-in place, and increase effective endotherm area of thermal-collecting tube, improve thermal-collecting tube efficient, described bellows is arranged in the annular space that described metal inner pipe and glass outer tube constitute.
In order to produce the pressure sealing-in, the coefficient of expansion of described glass metal transition piece is greater than the coefficient of expansion of described glass outer tube.
As preferably, the coefficient of expansion difference of the coefficient of expansion of described glass metal transition piece and described glass outer tube is in 10%.
For easy to operate, the glass outer tube that carries out sealing-in with described glass metal transition piece is a short tube, and described short tube is connected with long glass tube butt joint, forms the required glass outer tube of solar vacuum heat-collecting pipe.
The beneficial effect of the utility model embodiment is: compared to existing technology, expansion compensation device described in the utility model, adopted the structure that an end of described bellows is fixedlyed connected with metal inner pipe, the other end is fixedlyed connected with the glass outer tube by the glass metal transition piece, made device described in the utility model be applicable to middle temperature and high temperature and have advantage simple in structure, that air-tightness is good.
Description of drawings
Fig. 1 is the structural representation of the expansion compensation device of the described solar vacuum heat-collecting pipe of the utility model embodiment;
Fig. 2 is the connection enlarged drawing of glass outer tube shown in Fig. 1 and glass metal transition piece.
Among the figure: 1 metal inner pipe, 2 glass outer tubes, 3 bellowss, 4 glass metal transition pieces, 5 connectors, 6 solar vacuum heat-collecting pipes.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, but not as to qualification of the present utility model.
Shown in Fig. 1-2, a kind of solar vacuum heat-collecting pipe 6 comprises metal inner pipe 1 and the glass outer tube 2 coaxial with it.Glass outer tube 2 adopts the high glass of light transmittance, and metal inner pipe 1 adopts stainless steel alloy, and metal inner pipe 1 outer wall is coated with the high-temperature selective absorber coatings.Reduce heat loss by vacuumizing between glass outer tube 2 and the metal inner pipe 1, and alleviate vertical thermal expansion stress by the expansion compensation device.
Concrete, shown in Fig. 1-2, the described expansion compensation device of the utility model embodiment adopts the bellows 3 with expansion compensation effect.Bellows 3 is set in the outside of metal inner pipe 1.During concrete enforcement, bellows 3 can be arranged on outside the annular space that glass outer tube 2 and metal inner pipe 1 form or within.In this example, bellows 3 is arranged in the annular space, and this setting not only can stop slot light collection to reflex to sealing-in place, and has increased effective endotherm area of thermal-collecting tube, has improved thermal-collecting tube efficient.
Referring to Fig. 1, an end of bellows 3 is welded to connect by connector 5 and metal inner pipe 1, also can be the fixedly connected of other, as bonding.The other end of bellows 3 is connected with 2 sealing-ins of glass outer tube by glass metal transition piece 4, and wherein, glass metal transition piece 4 can adopt two-sided or the single face sealing-in with glass outer tube 2.As shown in Figure 1, in this example, glass outer tube 2 adopts extrapolation to carry out sealing-in with glass metal transition piece 4, is about to glass outer tube 2 outer walls and glass metal transition piece 4 inwalls and seals (referring to Fig. 2) in single face sealing by fusing mode, is guaranteeing bonding strength and the bubble-tight designs simplification of having accomplished simultaneously.Specifically, referring to Fig. 1 and Fig. 2, glass metal transition piece 4 is for covering shape, be provided with the hole that is used to pass metal inner pipe 1 in the middle of it, be provided with annular groove around the hole, annular groove is used to insert glass outer tube 2, and the inner surface of annular groove external annulus is used as and contacts with the outer surface of the outer wall of described glass outer tube 2 and form sealing surface.So it is lower to the dimension precision requirement of glass outer tube 2 to plant structure, make simple to operately, in the sealing-in process, only need to guarantee that glass outer tube 2 outer walls can be inserted in the glass metal transition piece 4, sealing-in just can be finished smoothly.
In order to help producing the pressure sealing-in, the coefficient of expansion of glass metal transition piece 4 is greater than the coefficient of expansion of glass outer tube 2, or the coefficient of expansion of the coefficient of expansion of glass metal transition piece 4 and glass outer tube 2 is complementary.As preferably, the coefficient of expansion difference of the coefficient of expansion of described glass metal transition piece 4 and described glass outer tube 2 is in 10%.Because the coefficient of expansion of metal will be higher than glass, in annealing process, glass metal transition piece 4 can produce pressure to glass, and the compression strength of glass is higher than its tensile strength far away, although therefore 4 pairs of glass outer tubes of glass metal transition piece 2 produce bigger compression, this pressure but can make sealing-in place have sealing strength preferably.In this example, the coefficient of expansion of glass metal transition piece 4 is 4.9 * 10
-6/ K, the coefficient of expansion of glass outer tube 2 are 3.3 * 10
-6/ K.The coefficient of expansion of glass outer tube 2 also can be 4.8 * 10
-6/ K.
In order to make air-tightness better, when adopting the sealing-in of single face sealing by fusing mode in this example, need to guarantee sealing-in length more than 5mm, can make between glass and metal, to form fine and close oxide sealing layer, be beneficial to the maintenance of vacuum performance.In this example, glass outer tube 2 is 6mm with the sealing-in length of glass metal transition piece 4.In order to improve the reliability of sealing-in place, the outer surface coating reflecting layer at glass metal transition piece 4 reduces the solar radiation and the heat radiation of sealing-in place, thereby has reduced the temperature of sealing-in place.
Generally speaking, the length of the glass outer tube 2 in the solar vacuum heat-collecting pipe 6 is four meters, adopts four meters glass outer tube 2 to carry out sealing-in with glass metal transition piece 4 in the production, in case the failure of sealing-in link occurs, whole glass outer tube 2 all will be scrapped, and has very big waste.In the utility model, the glass outer tube 2 that carries out sealing-in with glass metal transition piece 4 is the glass short tube, and after the sealing-in step was finished, the glass short tube docked with long glass tube with bore again.The short glass tube of this employing directly can adopt less annealing device with the modes of glass metal transition piece 4 sealing-ins, and is not only easy to operate, in case and sealing-in damage, whole four meters long glass outer tube 2 is not influenced, greatly the yield rate of the product of Ti Gaoing.
So expansion compensation device described in the utility model, adopted the structure that an end of described bellows 3 is fixedlyed connected with metal inner pipe 1, the other end is fixedlyed connected with glass outer tube 2 by glass metal transition piece 4, made device described in the utility model be applicable to middle temperature and high temperature and have advantage simple in structure, that air-tightness is good.
Above-described embodiment, the utility model specific embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solutions of the utility model scope and replacing all should be included in the protection domain of the present utility model.
Claims (6)
1. the expansion compensation device of a solar vacuum heat-collecting pipe, be arranged between metal inner pipe and the glass outer tube, comprise the bellows that is set in the metal inner pipe outside, it is characterized in that: an end of described bellows is fixedlyed connected with metal inner pipe by connector, and the other end of described bellows is fixedlyed connected with the glass outer tube by the glass metal transition piece.
2. expansion compensation device according to claim 1 is characterized in that: the part of described glass metal transition piece be socketed on the outer wall of described glass outer tube and with the contacted outer wall single face sealing by fusing of described glass outer tube.
3. expansion compensation device according to claim 2 is characterized in that: described bellows is arranged in the annular space of described metal inner pipe and glass outer tube formation.
4. according to claim 2 or 3 described expansion compensation devices, it is characterized in that: the coefficient of expansion of described glass metal transition piece is greater than the coefficient of expansion of described glass outer tube.
5. expansion compensation device according to claim 4 is characterized in that: the coefficient of expansion difference of the coefficient of expansion of described glass metal transition piece and described glass outer tube is in 10%.
6. according to the described expansion compensation device of the arbitrary claim of claim 1-3, it is characterized in that: the glass outer tube that carries out sealing-in with described glass metal transition piece is a short tube, and described short tube is connected with long glass tube butt joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202469723U CN201561587U (en) | 2009-11-11 | 2009-11-11 | Expansion compensation device of solar vacuum collector tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202469723U CN201561587U (en) | 2009-11-11 | 2009-11-11 | Expansion compensation device of solar vacuum collector tube |
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| Publication Number | Publication Date |
|---|---|
| CN201561587U true CN201561587U (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202469723U Expired - Fee Related CN201561587U (en) | 2009-11-11 | 2009-11-11 | Expansion compensation device of solar vacuum collector tube |
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| CN (1) | CN201561587U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673350A (en) * | 2013-12-05 | 2014-03-26 | 敖火庚 | Manufacturing method of solar vacuum heat-collecting tube |
| CN104380007A (en) * | 2012-06-27 | 2015-02-25 | 株式会社丰田自动织机 | Solar-heat collection tube |
| CN106918147A (en) * | 2015-12-28 | 2017-07-04 | 康雪慧 | A kind of heat collecting element and heat collector |
-
2009
- 2009-11-11 CN CN2009202469723U patent/CN201561587U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104380007A (en) * | 2012-06-27 | 2015-02-25 | 株式会社丰田自动织机 | Solar-heat collection tube |
| CN103673350A (en) * | 2013-12-05 | 2014-03-26 | 敖火庚 | Manufacturing method of solar vacuum heat-collecting tube |
| CN103673350B (en) * | 2013-12-05 | 2015-08-12 | 敖火庚 | The manufacture method of solar vacuum heat-collecting pipe |
| CN106918147A (en) * | 2015-12-28 | 2017-07-04 | 康雪慧 | A kind of heat collecting element and heat collector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20151111 |
|
| EXPY | Termination of patent right or utility model |