CN104165472B - The end seal structure of vacuum heat collection pipe - Google Patents
The end seal structure of vacuum heat collection pipe Download PDFInfo
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- CN104165472B CN104165472B CN201410443914.5A CN201410443914A CN104165472B CN 104165472 B CN104165472 B CN 104165472B CN 201410443914 A CN201410443914 A CN 201410443914A CN 104165472 B CN104165472 B CN 104165472B
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- tube
- cut down
- becket
- glass
- transitional
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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 present invention discloses a kind of end seal structure of vacuum heat collection pipe, comprise outer tube and interior pipe, outer tube is outer glass tube, the metal heat-conducting tube that interior Guan Weiyu outer concentric tube is arranged, make to form vacuum heat-preserving chamber between outer glass tube inwall and metal heat-conducting tube outer wall by the hermetically-sealed construction at outer glass tube both ends, heat absorbing sheet is welded on the metal heat-conducting tube in vacuum heat-preserving chamber; 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; Transitional glass lining combines together with outer glass tube end, and outer rim and the transitional glass that can cut down becket serve as a contrast welding; Welding transitional glass lining between the inner and outer pipe that the present invention utilizes the coefficient of expansion to differ larger, reduce stress, increase end mechanical strength, the cannelure of becket can be cut down simultaneously and hang limit design, effectively can absorb the deformation elastic force between inner and outer pipe, reduce the thermal shock to fusion point and thermal stress.
Description
Technical field
The invention belongs to Application of Solar Energy field, particularly a kind of end seal structure of vacuum heat collection pipe.
Background technology
Solar energy heat collection pipe is by sunshine is formed linear light articulate fascia through grooved parabolic reflector, thermal-collecting tube is positioned on hot spot band, absorb heat and material in heating tube, for reducing the heat loss of thermal-collecting tube, must be evacuated between metal inner pipe and outer glass tube, at present general produce in by vacuum degree control at 0.013Pa, therefore, sealing-in place of metal and glass will ensure compact siro spinning technology, and leak rate is reduced as far as possible.
But there is comparatively big difference in front conventional kovar alloy and solar energy high boron glass thermal coefficient of expansion, the two is difficult to directly carry out sealing-in, the problem that one section of transitional glass solves sealing-in is normally added in production, the coefficient of expansion of transition metal is between glass and metal, its two ends respectively with metal and outer glass tube sealing-in, to reach reduction stress, realize the technique effect of sealing, as the Chinese patent that the patent No. is " 201010116612.9 ", namely the method for sealing of a kind of solar energy heat collection pipe metal and glass is disclosed, but this patent transitional glass and outer glass tube are the modes adopting the edge of a knife to cut glass carries out sealing by fusing, this knife seal mode mechanical strength is less, transitional glass and outer glass tube are at high temperature, high pressure, easily depart under the effect that thermal stress or external force are collided with, increase the possibility of gas leakage, the air-tightness of the whole device of final reduction, therefore, develop the connected mode between a kind of transitional glass and outer glass 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, provide a kind of vacuum heat collection pipe, the transitional glass of this thermal-collecting tube and outer glass tube can realize stabilized seal at high temperature under high pressure, and increase the air-tightness of device, the present invention is achieved in that
A kind of end seal structure of vacuum heat collection pipe, comprise outer tube and interior pipe, it is characterized in that, outer tube is outer glass tube, the metal heat-conducting tube that interior Guan Weiyu outer concentric tube is arranged, make to form vacuum heat-preserving chamber between outer glass tube inwall and metal heat-conducting tube outer wall by the hermetically-sealed construction at outer glass tube both ends, 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 outer glass tube end, and outer rim and the transitional glass that can cut down becket serve as a contrast welding.
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 overlap for metal is bushing, the inwall that metal is bushing and metal heat-conducting tube closed set, 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: it is metal sleeve that transition metal overlap, one end of metal sleeve 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 outer glass tube adopts the coefficient of expansion to be 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 outer glass tube and can cut down between becket.
In the present invention, outer glass tube and can cut down and be at least provided with a transitional glass between becket and serve as a contrast, each transitional glass lining is 5-10% with the coefficient of expansion gap between adjacent link.
In the present invention, the described thickness cutting down becket is 0.1 ~ 2mm, the outer ring can cutting down becket is a cannelure, the section of cannelure is semicircular arc, the curved surface of the outside cell wall of cannelure and the transitional glass of next-door neighbour serve as a contrast inwall and 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 upwards roll over turn over be close to transition metal cover outer wall after be tightly connected with it.
In the present invention, the inwall of described transitional glass lining is identical with the curvature of the ring slot outside cell wall curved surface that can cut down becket, and the inwall hypomere that transitional glass serves as a contrast is cell wall surface extending hold in the palm the below in ring slot outside cell wall outside groove annularly.
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: can cut down after becket cleans up, put into hydrogen-burning stove and carry out annealing in hydrogen atmosphere process with 600-1100 DEG C, putting humidity is again be heated to 400-700 DEG C in the atmosphere furnace of 50-100RH, after making to cut down becket surface formation oxide layer, recycling glass work lathe can cut down becket outer rim and transitional glass serves as a contrast welding, and fusion temp is 600-1100 DEG C.
In the present invention, described oxidated layer thickness is 1-6 μm, 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 outer glass tube, to reduce stress, transitional glass lining directly contacts welding with between outer glass tube, but not edge of a knife incision glass head seal, increase the mechanical strength of weld, ensure 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 in thermal-collecting tube work and can cut down expanded by heating distortion and pass to the stress deformation of fusion point; protect weld transitional glass simultaneously; when meeting external force and colliding with; external force can be cut down absorption, ensures that glass can not answer external force cracked.
3, the outer ring can cutting down becket is a cannelure, effectively can absorb by elastic deformation the deformation causing because temperature is different between adjustment metal heat-conducting tube with outer glass tube expanding with heat and contract with cold.
4, cutting down becket and metal heat-conducting tube, to arrange transition bushing, with location and raising soldering reliability, when avoiding thermal-collecting tube heating of metal heat pipe to heat up, high temperature is too fast is simultaneously transmitted to the weld that can cut down becket and outer glass tube, reduce the thermal shock to fusion point and thermal stress, and increase local heat radiation, alleviate thermic load, improve the stability of vacuum tube.
5, the inwall of transitional glass lining adopts identical profile design with the curved surface that can cut down becket, under the effect of vacuum tube external and internal pressure difference, can fit tightly between the two, make 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 becket be cut down, 7, transitional glass lining.
Detailed description of the invention
Below by way of drawings and Examples, the present invention will be further described.
Embodiment 1:
Vacuum heat collection pipe comprises outer tube, interior pipe, heat absorbing sheet and end seal structure, as seen from Figure 1: outer tube of the present invention is glass tube 1, the metal heat-conducting tube 2 that interior Guan Weiyu outer concentric tube is arranged, 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 material 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 bore and be tightly connected; The described transitional glass lining outer wall of 7 and the inwall of outer glass 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 that metal is bushing, the inwall that metal is bushing and metal heat-conducting tube 2 closed set, and outer wall is tightly connected with the centre bore that can cut down becket 6.The described thickness cutting down becket 6 is 0.1 ~ 2mm, the outer ring can cutting 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 the transitional glass of next-door neighbour serve as a contrast 7 inwalls and coincide, their curvature is identical, the inwall hypomere annularly groove outer wall surface extending hold in the palm the below in cannelure outer wall of transitional glass lining 7, 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 the central bore can cutting down becket 6 upwards roll over turn over be close to the bushing outer wall of transition after be tightly connected with it.
In the present embodiment, plane that becket 6 is positioned at outer rim can be cut down be hung on transitional glass lining 7 and along rear with the method for its welding be: can cut down after becket 6 cleans up, put into hydrogen-burning stove and carry out annealing in hydrogen atmosphere process 20min with 600-1100 DEG C, being placed in humidity is again that the atmosphere furnace of 50-100RH is heated to 400-700 DEG C, making to cut down becket surface formation thickness is 1-6 μm, and density is 0.2-2.0mg/m
2after oxide layer, recycling glass work lathe can cut down becket 6 outer rim and hang limit and transitional glass and serve as a contrast 7 and be heated to 600-1100 DEG C, and transitional glass serves as a contrast 7 by scorification, then with can cut down becket 6 outer rim molten adhere, thus make metal-glass transition fusion splice.After transitional glass serves as a contrast 7 elder generations and can cut down becket 6 welding, transitional glass serves as a contrast 7 outer walls and outer glass tube 1 flame and is heated to welding after 700-1200 DEG C of melting, again with the flame of 400-600 DEG C or baking oven annealing, made transitional glass serve as a contrast 7 outer walls again with outer glass tube 1 sealing-in.
Outer glass tube 1 and can cut down and be at least provided with a transitional glass between becket 6 and serve as a contrast 7, transitional glass lining 7 adopts one or many soda-lime glass scorifications composition, 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%, the quantity of 7 and the material mixture ratio of transitional glass is served as a contrast according to outer glass tube 1 and the expansion coefficient difference determination transitional glass that can cut down becket 6, making transitional glass serve as a contrast coefficient of expansion gap between 7 and outer glass tube 1 is within 5-10%, transitional glass lining 7 is within 5-10% with cutting down becket 6 coefficient of expansion gap, and between each transitional glass lining 7, the level gradient of the coefficient of expansion also controls within 5-10%; Also can directly use electronic glass DM308 as transitional glass lining 7 in practical operation.
During concrete enforcement, what described outer glass tube 1 adopted is the coefficient of expansion is 3.0x10
-6-8.0x10
-6the middle Pyrex of/K, can cut down becket 6 and adopt the coefficient of expansion to be 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 described in it and Fig. 1 is: described transition metal overlaps 5 transition metal and overlaps for metal sleeve, one end of metal sleeve after in-flanges with metal heat-conducting tube 2 seal welding, the other end with can cut down becket central bore and be tightly connected.
During concrete enforcement, transition metal cover 5 is welded by the mode of argon arc (also can adopt soldering or vacuum brazing) with interior pipe 2, and the axis of interior pipe 2 adopts laser or hyperacoustic mode to weld 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 embodiments of equivalent variations; these any simple modification, equivalent variations and the remodeling done according to the present invention, still belongs to the protection domain of technical solution of the present invention.
Claims (8)
1. the end seal structure of a vacuum heat collection pipe, comprise outer tube and interior pipe, it is characterized in that, outer tube is outer glass tube, the metal heat-conducting tube that interior Guan Weiyu outer concentric tube is arranged, make to form vacuum heat-preserving chamber between outer glass tube inwall and metal heat-conducting tube outer wall by the hermetically-sealed construction at outer glass tube both ends, 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 outer glass tube end, and outer rim and the transitional glass that can cut down becket serve as a contrast welding;
The described thickness cutting down becket is 0.1 ~ 2mm, the outer ring can cutting down becket is a cannelure, the section of cannelure is semicircular arc, the curved surface of the outside cell wall of cannelure and the transitional glass of next-door neighbour serve as a contrast inwall and 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 upwards roll over turn over be close to transition metal cover outer wall after be tightly connected with it.
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: it is that metal is bushing that transition metal overlap, the inwall that metal is bushing and metal heat-conducting tube closed set, outer wall with 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: it is metal sleeve that transition metal overlap, one end of metal sleeve 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 outer glass tube adopts the coefficient of expansion to be 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 outer glass 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, outer glass tube and can cut down and be at least provided with a transitional glass between becket and serve as a contrast, and each transitional glass lining is 5-10% with the coefficient of expansion gap between adjacent link.
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 inwall of described transitional glass lining is identical with the curvature of the ring slot outside cell wall curved surface that can cut down becket, and the inwall hypomere that transitional glass serves as a contrast is cell wall surface extending hold in the palm the below in ring slot outside cell wall outside groove annularly.
7. 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 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: can cut down after becket cleans up, put into hydrogen-burning stove and carry out annealing in hydrogen atmosphere process with 600-1100 DEG C, being placed in humidity is again that the atmosphere furnace of 50-100RH is heated to 400-700 DEG C, after making to cut down becket surface formation oxide layer, recycling glass work lathe can cut down becket outer rim and transitional glass serves as a contrast welding, and fusion temp is 600-1100 DEG C.
8. the end seal structure of vacuum heat collection pipe according to claim 7, is characterized in that, described oxidated layer thickness is 1-6 μm, and density is 0.2-2.0mg/m
2.
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| CN201410443914.5A CN104165472B (en) | 2014-09-03 | 2014-09-03 | The end seal structure of vacuum heat collection pipe |
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| CN201410443914.5A CN104165472B (en) | 2014-09-03 | 2014-09-03 | The end seal structure of vacuum heat collection pipe |
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| CN104165472B true CN104165472B (en) | 2016-01-13 |
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| 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 |
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 |
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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 |
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| CN104165472A (en) | 2014-11-26 |
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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. |