CN104165472A - End sealing structures of vacuum heat collection tube - Google Patents
End sealing structures of vacuum heat collection tube Download PDFInfo
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- CN104165472A CN104165472A CN201410443914.5A CN201410443914A CN104165472A CN 104165472 A CN104165472 A CN 104165472A CN 201410443914 A CN201410443914 A CN 201410443914A CN 104165472 A CN104165472 A CN 104165472A
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- tube
- glass
- cut down
- becket
- metal
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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
Abstract
The invention discloses end sealing structures of a vacuum heat collection tube. The vacuum heat collection tube comprises an outer tube and an inner tube. The outer tube is a glass outer tube, and the inner tube is a metal heat conducting tube which is concentric with the outer tube. Vacuum heat preservation cavities are formed between the inner wall of the glass outer tube and the outer wall of the metal heat conducting tube through the sealing structures at the two ends of the glass outer tube, and a heat absorption piece is welded to the metal heat conducting tube in the vacuum heat preservation cavities. Each sealing structure comprises a transition metal sleeve, a kovar metal ring and a transition glass lining. The transition metal sleeves are connected with the metal heat conducting tube in a sealed mode and are connected with central holes in the kovar metal rings in a sealed mode as well. The transition glass linings and the ends of the glass outer tube are fused into a whole, and the outer edges of the kovar metal rings are connected with the transition glass linings in a melt mode. According to the end sealing structures of the vacuum heat collection tube, the transition glass linings are connected between the inner tube and the outer tube which have great difference in expansion factor in a melt mode, so that stress is reduced and end mechanical strength is enhanced; meanwhile,through the design of annular grooves and hanging edges of the kovar metal rings, the deformation elastic force between the inner tube and the outer tube can be effectively absorbed, and thermal shock and thermal stress on melting points can be reduced.
Description
Technical field
The invention belongs to the end seal structure in Application of Solar Energy field, particularly a kind of vacuum heat collection pipe.
Background technology
Solar energy heat collection pipe is by sunshine is formed to linear light articulate fascia through grooved parabolic reflector, thermal-collecting tube is positioned on hot spot band, absorb material in heat heating tube, for reducing the heat loss of thermal-collecting tube, must will between metal inner pipe and glass outer tube, be evacuated, at present in general production by vacuum degree control at 0.013Pa, therefore, sealing-in place of metal and glass will guarantee tight connection, and leak rate is reduced as far as possible.
But front conventional kovar alloy and solar energy high boron glass thermal coefficient of expansion exist compared with big difference, the two is difficult to directly carry out sealing-in, in production, normally add one section of transitional glass and solve the problem of sealing-in, the coefficient of expansion of transition metal is between glass and metal, its two ends respectively with metal and the sealing-in of glass outer tube, to reach, reduce stress, realize the technique effect of sealing, if the patent No. is the Chinese patent of " 201010116612.9 ", the method for sealing of a kind of solar energy heat collection pipe metal and glass is disclosed, but this patent transitional glass and glass outer tube are to adopt the mode of edge of a knife incision glass to carry out sealing by fusing, this knife seal mode mechanical strength is less, transitional glass and glass outer tube are at high temperature, high pressure, under the effect that thermal stress or external force are collided with, easily depart from, increase the possibility of gas leakage, the final air-tightness that reduces whole device, therefore, develop the connected mode between a kind of transitional glass and glass outer tube, increase the air-tightness of vacuum heat collection pipe, it is this area technical barrier urgently to be resolved hurrily always.
Summary of the invention
For the problems referred to above, a kind of vacuum heat collection pipe is provided, the transitional glass of this thermal-collecting tube and glass outer tube can be realized stabilized seal under HTHP, increase the air-tightness of device, and the present invention is achieved in that
A kind of end seal structure of vacuum heat collection pipe, comprise outer tube and inner tube, it is characterized in that, outer tube is glass outer tube, inner tube is the metal heat-conducting tube arranging with outer concentric tube, hermetically-sealed construction by glass outer tube both ends makes to form vacuum heat-preserving chamber between glass outer tube wall and metal heat-conducting tube outer wall, and heat absorbing sheet is welded on the metal heat-conducting tube in vacuum heat-preserving chamber;
Described hermetically-sealed construction comprises transition metal cover, can cut down becket and transitional glass lining, and transition metal cover is tightly connected with metal heat-conducting tube, simultaneously with can cut down becket centre bore and be tightly connected; Described transitional glass lining combines together with glass outer tube end, can cut down outer rim and the welding of transitional glass lining of becket.
In the present invention, described transition metal cover is tightly connected with metal heat-conducting tube, simultaneously with can cut down becket centre bore and be tightly connected and refer to: transition metal cover is metal edge cover, inwall and the metal heat-conducting tube closed set of metal edge cover, outer wall and can cut down becket centre bore and be tightly connected.
In the present invention, described transition metal cover is tightly connected with metal heat-conducting tube, simultaneously with can cut down becket centre bore and be tightly connected and refer to: transition metal cover is metal sleeve, one end of metal sleeve to after in-flanges with metal heat-conducting tube seal welding, the other end with can cut down becket centre bore and be tightly connected.
In the present invention, described glass outer tube is that the employing coefficient of expansion is 3.0x10
-6-8.0x10
-6the Pyrex of/K, the coefficient of expansion that can cut down becket is 4.0x10
-6-6.0x10
-6/ K, the coefficient of expansion of described transitional glass lining is between glass outer tube and can cut down between becket.
In the present invention, glass outer tube and can cut down and be at least provided with a transitional glass lining between becket, the coefficient of expansion gap between each transitional glass lining and adjacent attachment is 5-10%.
In the present invention, the described thickness that cuts down becket is 0.1 ~ 2mm, the outer ring that can cut down becket is a cannelure, the section of cannelure is semicircular arc, the curved surface of outside cell wall of cannelure and next-door neighbour's transitional glass lining inwall coincide, outside cell wall top turn up back plane be hung on transitional glass be lining with along and with its welding, extension edge lengths is 0.5-3mm; The centre bore that can cut down becket makes progress to roll over to turn over to be close to after transition metal overlaps outer wall and is tightly connected with it.
In the present invention, the inwall of described transitional glass lining is identical with the curvature of ring slot outside cell wall curved surface that can cut down becket, and the inwall hypomere that transitional glass serves as a contrast extends and holds in the palm in the below of ring slot outside cell wall along ring slot outside cell wall curved surface.
In the present invention, describedly cut down plane that becket is positioned at outer rim and be hung on transitional glass and be lining with along referring to its welding: after can cutting down becket and cleaning up, put into hydrogen-burning stove and carry out annealing in hydrogen atmosphere processing with 600-1100 ℃, put again in the atmosphere furnace that humidity is 50-100RH and be heated to 400-700 ℃, making to cut down becket surface forms after oxide layer, recycling glass work lathe can cut down becket outer rim and the welding of transitional glass lining, and fusion temp is 600-1100 ℃.
In the present invention, described oxidated layer thickness is 1-6 μ m, and density is 0.2-2.0mg/m
2.
Beneficial effect of the present invention is:
1, the present invention utilizes the coefficient of expansion to differ welding transitional glass lining between larger cut down metal and glass outer tube, to reduce stress, between transitional glass lining and glass outer tube, directly contact welding, but not the edge of a knife is cut glass head seal, increase the mechanical strength of weld, guarantee the air-tightness of whole device.
2, can cut down plane that becket is positioned at outer rim be hung on transitional glass along and its welding; increase the intensity that end face can cut down; can reduce and cut off the stress deformation that can cut down expanded by heating distortion in thermal-collecting tube work and pass to fusion point; protect weld transitional glass simultaneously; when chance external force is collided with; external force can be cut down absorption, and assurance glass can not answer external force cracked.
3, the outer ring that can cut down becket is a cannelure, can be effectively by elastic deformation, absorbs to adjust between metal heat-conducting tube and glass outer tube, because temperature is different, to cause the deformation of expanding with heat and contract with cold.
4, transition edge cover is set can cut down becket and metal heat-conducting tube, with location and raising soldering reliability, the too fast weld that can cut down becket and glass outer tube that is transmitted to of high temperature while simultaneously avoiding thermal-collecting tube heating of metal heat pipe to heat up, reduction is to the thermal shock of fusion point and thermal stress, and the local heat radiation of increase, alleviate thermic load, improve the stability of vacuum tube.
5, the inwall of transitional glass lining adopts identical shape design with the curved surface that can cut down becket, under the poor effect of vacuum tube external and internal pressure, can fit tightly between the two, makes sealing-in tightr.
Accompanying drawing explanation
Fig. 1 is a kind of example structure schematic diagram of the present invention.
Fig. 2 is another kind of example structure schematic diagram of the present invention.
In figure: 1, glass tube, 2, metal heat-conducting tube, 3, heat absorbing sheet, 4, vacuum heat-preserving chamber, 5, transition metal cover, 6, can cut down becket, 7, transitional glass lining.
The specific embodiment
Below by drawings and Examples, the present invention will be further described.
Embodiment 1:
Vacuum heat collection pipe comprises outer tube, inner tube, heat absorbing sheet and end seal structure, as seen from Figure 1: outer tube of the present invention is glass tube 1, inner tube is the metal heat-conducting tube 2 arranging with outer concentric tube, glass tube 1 and metal heat-conducting tube 2 form vacuum heat-preserving chamber 4 by end seal structure, and heat absorbing sheet 3 is welded on the metal heat-conducting tube 2 in vacuum heat-preserving chamber 4.
Described hermetically-sealed construction comprises transition metal cover 5, can cut down becket 6 and transitional glass lining 7, and can cut down becket 6 materials is alloy 4J29, and the material of transition metal cover 5 is stainless steel 304 or Stainless steel 316.Transition metal cover 5 is tightly connected with metal heat-conducting tube 2, simultaneously with can cut down becket 6 centre bores and be tightly connected; The outer wall of described transitional glass lining 7 and the inwall of glass outer tube 1 end combine together, and outer rim extension limit and the transitional glass that can cut down becket 6 serve as a contrast 7 weldings.
In the present embodiment, transition metal cover 5 is metal edge cover, inwall and metal heat-conducting tube 2 closed sets of metal edge cover, and outer wall is tightly connected with the centre bore that can cut down becket 6.The described thickness that cuts down becket 6 is 0.1 ~ 2mm, the outer ring that can cut down becket 6 is a cannelure, the section of cannelure is semicircular arc, the cambered surface diameter 5mm of semicircular arc, the curved surface of outside cell wall of cannelure and next-door neighbour's transitional glass serve as a contrast 7 inwalls and coincide, their curvature is identical, the inwall hypomere of transitional glass lining 7 extends and holds in the palm in the below of cannelure outer wall along cannelure outer wall curved surface, the top of ring slot outside cell wall turn up back plane be hung on transitional glass lining 7 along and with its welding, extension edge lengths is 0.5-3mm, be positioned at can cut down becket 6 central bore upwards folding turn over after being close to transition edge cover outer wall and be tightly connected with it.
In the present embodiment, can cut down plane that becket 6 is positioned at outer rim is hung on transitional glass lining 7 and along rear with method its welding is: after can cutting down becket 6 and cleaning up, put into hydrogen-burning stove and carry out annealing in hydrogen atmosphere processing 20min with 600-1100 ℃, the atmosphere furnace that is placed in humidity again and is 50-100RH is heated to 400-700 ℃, making to cut down becket surface formation thickness is 1-6 μ m, and density is 0.2-2.0mg/m
2after oxide layer, recycling glass work lathe can cut down becket 6 outer rims and hang limits and be heated to 600-1100 ℃ with transitional glass lining 7, and transitional glass serves as a contrast 7 by scorification, then with can cut down becket 6 outer rim molten adhere, thereby make metal-glass transition fusion splice.Transitional glass serves as a contrast 7 first and can cut down after becket 6 weldings, transitional glass serves as a contrast 7 outer walls and glass outer tube 1 use flame and is heated to welding after 700-1200 ℃ of melting, again with the flame of 400-600 ℃ or baking oven annealing, made transitional glass serve as a contrast 7 outer walls again with 1 sealing-in of glass outer tube.
Glass outer tube 1 and can cut down and be at least provided with a transitional glass lining 7 between becket 6, transitional glass lining 7 adopts the scorifications of one or many soda-lime glass to form, and main component is B
2o
3: 5% ~ 30%; SiO
2: 40% ~ 80%; K
2o:1% ~ 10%; Al
2o
3: 1% ~ 10%; Na
2o:1% ~ 10%, according to glass outer tube 1 and the expansion coefficient difference that can cut down becket 6, determine the quantity of transitional glass lining 7 and the material mixture ratio of transitional glass, making coefficient of expansion gap between transitional glass lining 7 and glass outer tube 1 is in 5-10%, transitional glass lining 7 is in 5-10% with cutting down becket 6 coefficient of expansion gaps, and between each transitional glass lining 7, the level gradient of the coefficient of expansion is also controlled in 5-10%; In practical operation, also can directly use electronic glass DM308 as transitional glass lining 7.
During concrete enforcement, what described glass outer tube 1 adopted is that the coefficient of expansion is 3.0x10
-6-8.0x10
-6the middle Pyrex of/K, can cut down the becket 6 employing coefficients of expansion is 4.0x10
-6-6.0x10
-6the alloy 4J29 of/K, the coefficient of expansion of described transitional glass lining 7 is between outer tube and can cut down between becket.
Embodiment 2
As seen from Figure 2, the difference of embodiment is described in it and Fig. 1: it is metal sleeve that described transition metal overlaps 5 transition metal covers, one end of metal sleeve to after in-flanges with metal heat-conducting tube 2 seal weldings, the other end with can cut down becket central bore and be tightly connected.
During concrete enforcement, transition metal cover 5 welds by the mode of argon arc (also can adopt soldering or vacuum brazing) with inner tube 2, and axial employing laser or hyperacoustic mode of inner tube 2 are welded heat absorbing sheet 3.
The various embodiments described above are not limitations of the present invention; professional and technical personnel may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations; any simple modification, equivalent variations and remodeling that these are done according to the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (9)
1. the end seal structure of a vacuum heat collection pipe, comprise outer tube and inner tube, it is characterized in that, outer tube is glass outer tube, inner tube is the metal heat-conducting tube arranging with outer concentric tube, hermetically-sealed construction by glass outer tube both ends makes to form vacuum heat-preserving chamber between glass outer tube wall and metal heat-conducting tube outer wall, and heat absorbing sheet is welded on the metal heat-conducting tube in vacuum heat-preserving chamber;
Described hermetically-sealed construction comprises transition metal cover, can cut down becket and transitional glass lining, and transition metal cover is tightly connected with metal heat-conducting tube, simultaneously with can cut down becket centre bore and be tightly connected; Described transitional glass lining combines together with glass outer tube end, can cut down outer rim and the welding of transitional glass lining of becket.
2. the end seal structure of vacuum heat collection pipe according to claim 1, it is characterized in that, described transition metal cover is tightly connected with metal heat-conducting tube, simultaneously with can cut down becket centre bore and be tightly connected and refer to: transition metal cover overlaps for metal edge, inwall and the metal heat-conducting tube closed set of metal edge cover, outer wall and can cut down becket centre bore and be tightly connected.
3. the end seal structure of vacuum heat collection pipe according to claim 1, it is characterized in that, described transition metal cover is tightly connected with metal heat-conducting tube, simultaneously with can cut down becket centre bore and be tightly connected and refer to: transition metal cover is metal sleeve, one end of metal sleeve to after in-flanges with metal heat-conducting tube seal welding, the other end with can cut down becket centre bore and be tightly connected.
4. the end seal structure of vacuum heat collection pipe according to claim 1, is characterized in that, described glass outer tube is that the employing coefficient of expansion is 3.0x10
-6-8.0x10
-6the Pyrex of/K, the coefficient of expansion that can cut down becket is 4.0x10
-6-6.0x10
-6/ K, the coefficient of expansion of described transitional glass lining is between glass outer tube and can cut down between becket.
5. the end seal structure of vacuum heat collection pipe according to claim 4, is characterized in that, glass outer tube and can cut down and be at least provided with a transitional glass lining between becket, and the coefficient of expansion gap between each transitional glass lining and adjacent attachment is 5-10%.
6. according to the end seal structure of the vacuum heat collection pipe one of claim 1-5 Suo Shu, it is characterized in that, the described thickness that cuts down becket is 0.1 ~ 2mm, the outer ring that can cut down becket is a cannelure, the section of cannelure is semicircular arc, the curved surface of outside cell wall of cannelure and next-door neighbour's transitional glass lining inwall coincide, the top of outside cell wall turn up back plane be hung on transitional glass be lining with along and with its welding, extension edge lengths is 0.5-3mm; The centre bore that can cut down becket makes progress to roll over to turn over to be close to after transition metal overlaps outer wall and is tightly connected with it.
7. the end seal structure of vacuum heat collection pipe according to claim 6, it is characterized in that, the inwall of described transitional glass lining is identical with the curvature of ring slot outside cell wall curved surface that can cut down becket, and the inwall hypomere that transitional glass serves as a contrast extends and holds in the palm in the below of ring slot outside cell wall along ring slot outside cell wall curved surface.
8. the end seal structure of vacuum heat collection pipe according to claim 6, it is characterized in that, the top of the described outside cell wall back plane that turns up is hung on transitional glass and is lining with along and refers to its welding: after can cutting down becket and cleaning up, put into hydrogen-burning stove and carry out annealing in hydrogen atmosphere processing with 600-1100 ℃, the atmosphere furnace that is placed in humidity again and is 50-100RH is heated to 400-700 ℃, making to cut down becket surface forms after oxide layer, recycling glass work lathe can cut down becket outer rim and the welding of transitional glass lining, and fusion temp is 600-1100 ℃.
9. the end seal structure of vacuum heat collection pipe according to claim 8, is characterized in that, described oxidated layer thickness is 1-6 μ m, and density is 0.2-2.0mg/m
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410443914.5A CN104165472B (en) | 2014-09-03 | 2014-09-03 | The end seal structure of vacuum heat collection pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410443914.5A CN104165472B (en) | 2014-09-03 | 2014-09-03 | The end seal structure of vacuum heat collection pipe |
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| CN104165472A true CN104165472A (en) | 2014-11-26 |
| CN104165472B CN104165472B (en) | 2016-01-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403866A (en) * | 2015-07-31 | 2017-02-15 | 北京航天计量测试技术研究所 | Installation clamp applicable to linear displacement sensor assembly without installing holes |
| CN113310221A (en) * | 2021-06-03 | 2021-08-27 | 日照中科美阳太阳能制造有限公司 | Tubular solar energy with vacuum tube explosion-proof function |
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|---|---|---|---|---|
| CN101798184A (en) * | 2010-02-26 | 2010-08-11 | 北京天瑞星真空技术开发有限公司 | Sealing connection method of metal and glass of novel medium-high temperature solar energy heat collection pipe |
| CN201945073U (en) * | 2011-02-16 | 2011-08-24 | 北京天瑞星真空技术开发有限公司 | Intermediate-temperature solar vacuum heat-collecting pipe |
| CN202853169U (en) * | 2012-10-08 | 2013-04-03 | 北京工业大学 | Glass-metal sealing-in ends structure |
| CN204128226U (en) * | 2014-09-03 | 2015-01-28 | 南京诚远太阳能科技有限公司 | The end seal structure of vacuum heat collection pipe |
-
2014
- 2014-09-03 CN CN201410443914.5A patent/CN104165472B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798184A (en) * | 2010-02-26 | 2010-08-11 | 北京天瑞星真空技术开发有限公司 | Sealing connection method of metal and glass of novel medium-high temperature solar energy heat collection pipe |
| CN201945073U (en) * | 2011-02-16 | 2011-08-24 | 北京天瑞星真空技术开发有限公司 | Intermediate-temperature solar vacuum heat-collecting pipe |
| CN202853169U (en) * | 2012-10-08 | 2013-04-03 | 北京工业大学 | Glass-metal sealing-in ends structure |
| CN204128226U (en) * | 2014-09-03 | 2015-01-28 | 南京诚远太阳能科技有限公司 | The end seal structure of vacuum heat collection pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403866A (en) * | 2015-07-31 | 2017-02-15 | 北京航天计量测试技术研究所 | Installation clamp applicable to linear displacement sensor assembly without installing holes |
| CN113310221A (en) * | 2021-06-03 | 2021-08-27 | 日照中科美阳太阳能制造有限公司 | Tubular solar energy with vacuum tube explosion-proof function |
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|---|---|
| CN104165472B (en) | 2016-01-13 |
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Effective date of registration: 20190520 Address after: 210032 No. 6 Xinke No. 4 Road, Jiangbei New District, Nanjing City, Jiangsu Province Patentee after: Nanjing Zheshitai Electronic Technology Co., Ltd. Address before: 210032 No. 6 Xinke No. 4 Road, Nanjing High-tech Development Zone, Jiangsu Province Patentee before: NANJING CHENGYUAN SOLAR HEATING CO., LTD. |