CN110553407A - Sealing method of outer glass tube for medium-high temperature vacuum heat collecting tube - Google Patents
Sealing method of outer glass tube for medium-high temperature vacuum heat collecting tube Download PDFInfo
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- CN110553407A CN110553407A CN201910903743.2A CN201910903743A CN110553407A CN 110553407 A CN110553407 A CN 110553407A CN 201910903743 A CN201910903743 A CN 201910903743A CN 110553407 A CN110553407 A CN 110553407A
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- CN
- China
- Prior art keywords
- sealing
- outer glass
- glass tube
- kovar alloy
- tube
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
- C03C27/04—Joining glass to metal by means of an interlayer
- C03C27/042—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts
- C03C27/044—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts of glass, glass-ceramic or ceramic material only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
Abstract
the invention discloses a sealing method of an outer glass tube for a medium-high temperature vacuum heat collecting tube, which comprises the following steps: step 1, cleaning kovar alloy, and then carrying out hydrogen burning treatment in a hydrogen furnace; step 2, preheating the outer glass tube and the kovar alloy after hydrogen burning by using a fire head, and hanging a circle of inner glass beads on the inner wall of the sealing part of the kovar alloy when the sealing part of the outer glass tube is fully melted; step 3, hanging a circle of outer glass beads on the outer side of the kovar alloy sealing part; step 4, sealing the outer glass tube and the kovar alloy, and annealing by using a fire head after sealing; step 5, sealing two ends of a glass tube with a kovar-glass sealing piece respectively by using a flame fusion sealing method; and 6, annealing the sealed glass shell whole tube in an oven, and finishing the sealing work of the outer glass tube after the annealing is finished. The invention solves the problems that the existing metal-glass transition sealing process is complicated, the skill requirement is high, and the light transmittance is influenced by blackening of the sealing part.
Description
Technical Field
The invention belongs to the technical field of locomotive electrical appliances, and relates to a sealing method of an outer glass tube for a medium-high temperature vacuum heat collecting tube.
Background
at present, 3.3 borosilicate glass is mostly used for the outer glass tube of the domestic medium-high temperature vacuum heat collecting tube, the expansion coefficient of the 3.3 borosilicate glass is (3.3 +/-0.1) × 10 -6/° C, compared with DM308 glass, the glass has the advantages of high temperature resistance, high strength, good light transmittance, good chemical stability and the like, and can meet the use requirement of the outer glass tube of the solar medium-high temperature heat collecting tube, but the 4J29 kovar alloy is a ternary alloy material, the main components of the alloy material are iron, cobalt and nickel, the thermal expansion coefficient is between 4.8 × 10 -6/° C and 5.0 × 10 -6/° C, the difference between the thermal expansion coefficients of the glass and the 3.3 borosilicate glass is large, and the two are non-matching materials, so the sealing technology of the 3.3 borosilicate glass and the kovar alloy becomes a difficult point.
at present, transition sealing structures and thin edge straight sealing structures are mainly used in China. The transitional sealing technology needs to finish the transition of glass with the Kovar expansion coefficient of 5.0 to 3.3 through the sealing of Kovar and a plurality of transition materials which are approximately matched with each other, the sealing process is complicated, the requirement on the skill of an operator is high, and the production efficiency is low; in addition, the glass at the transitional sealing part is uneven in thickness and easy to blacken, and the mechanical strength and transmittance of the glass tube are affected. The metal thin edge sealing structure has the defects of high sealing difficulty and poor mechanical strength at the metal thin edge, belongs to non-matching sealing, and is easy to crack compared with matching sealing.
Disclosure of Invention
the invention aims to provide a sealing method of an outer glass tube for a medium-high temperature vacuum heat collecting tube, which solves the problems of complicated metal-glass transition sealing process, high skill requirement and influence on light transmittance due to blackening of a sealing part in the prior art.
the technical scheme adopted by the invention is that the sealing method of the outer glass tube for the medium-high temperature vacuum heat collecting tube specifically comprises the following steps:
Step 1, after cleaning the kovar alloy, carrying out hydrogen burning treatment in a hydrogen furnace, wherein a dark gray oxide layer is formed on the surface of the kovar alloy after hydrogen burning;
Step 2, preheating the outer glass tube and the kovar alloy after hydrogen burning by using a fire head, and hanging a circle of inner glass beads on the inner wall of the sealing part of the kovar alloy when the sealing part of the outer glass tube is fully melted and an oxide layer on the surface of the kovar alloy is in a molten state;
Step 3, hanging a circle of outer glass beads on the outer side of the kovar alloy sealing part;
Step 4, sealing the outer glass tube and the kovar alloy, and annealing by using a fire head after sealing;
Step 5, sealing two ends of a glass tube with a kovar-glass sealing piece respectively by using a flame fusion sealing method;
and 6, annealing the whole glass tube sealed in the step 5 in an oven, and finishing the sealing work of the outer glass tube after the annealing is finished.
the present invention is also characterized in that,
The hydrogen burning treatment temperature in the step 1 is 800-1300 ℃.
The width of the inner glass bead in the step 2 is 3-6 mm.
And 3, the width of the outer glass beads is 3-6 mm.
The annealing time in the step 4 is 2-10 minutes.
The annealing temperature in the step 6 is 500-600 ℃, and the heat preservation time is 10-60 min.
The kovar alloy is 4J29 kovar alloy.
The outer glass tube is made of borosilicate glass with an expansion coefficient of 4.8 multiplied by 10 -6/DEG C-5.1 multiplied by 10 -6/DEG C.
the sealing method of the outer glass tube for the medium-high temperature vacuum heat collecting tube has the advantages that the metal-glass of the outer glass tube can be directly sealed in a matching way, the sealing process is simple, the skill requirement is reduced, the sealing efficiency is improved, the original 4-5 transitional sealing is changed into only 1 sealing, and the production efficiency is improved by 2-3 times; the sealing product is safe and reliable, the service life of the product is long, and the mechanical strength and the light transmission performance of the sealing part are good.
drawings
FIG. 1 is a schematic structural view of an outer glass tube sealed by the sealing method of the invention.
In the figure, 1. kovar alloy, 2. borosilicate glass.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The 4J29 kovar alloy is a ternary alloy material, the main components of which are iron, cobalt and nickel, the thermal expansion coefficient is between 4.8 x 10 -6/DEG C and 5.0 x 10 -6/DEG C, the thermal expansion coefficient of the novel glass is between 4.8 x 10 -6/DEG C and 5.1 x 10 -6/DEG C, the two expansion coefficients are relatively close, and the matching sealing can be carried out.
The novel glass adopted by the outer glass tube in the invention is closer to 3.3 borosilicate glass in performance, and the specific parameter pairs are as shown in the following table 1:
TABLE 1
In addition, by performing a mechanical impact resistance test on the heat collecting tube using the novel glass as the outer glass tube, according to GB/T19775-2005, a solid steel ball with the diameter of 30mm freely falls off at the position 800mm above the middle parts of the two brackets and is aligned to the center of the heat collecting tube, and vertically impacts the middle part of the heat collecting tube, so that the heat collecting tube is not damaged.
The results of physical and chemical property tests show that the novel glass and the 3.3 borosilicate glass are relatively close to each other in acid resistance, alkali resistance, water resistance and light transmittance, and the novel glass has good mechanical impact resistance and can meet the use requirements of the direct-sealed heat collecting tube.
Therefore, the outer glass tube of the invention adopts borosilicate glass with the expansion coefficient of 4.8 multiplied by 10 -6/DEG C-5.1 multiplied by 10 -6/DEG C, and the sealing method of the outer glass tube for the medium-high temperature vacuum heat collecting tube comprises the following steps:
Step 1, cleaning the processed kovar alloy, and then carrying out hydrogen burning treatment in a hydrogen furnace, wherein the treatment temperature is 800-1300 ℃, a medium-dark gray oxide layer is formed on the surface of the kovar alloy after hydrogen burning, the main component is ferric argon oxide, and the oxide and glass have good wettability.
Cutting a section of outer glass tube of 40-200 mm, preheating the outer glass tube and the kovar alloy after hydrogen burning by using a fire head, wherein the outer glass tube is made of borosilicate glass with an expansion coefficient of 4.8 multiplied by 10 -6/DEG C-5.1 multiplied by 10 -6/DEG C, turning an inner glass bead on the inner surface of the kovar and gold sealing part when the sealing part of the outer glass tube is fully melted and an oxide layer on the surface of the kovar and gold sealing part is in a molten state, hanging a circle of inner glass bead on the sealing part of the kovar alloy, the width of the inner glass bead is 3-6 mm, the outer glass tube is made of the borosilicate glass with an expansion coefficient of 4.8 multiplied by 10 -6/DEG C-5.1 multiplied by 10 -6/DEG C, and the kovar alloy is 4J29 kovar alloy.
The material property of the novel glass is relatively short in the sealing process, namely, compared with kovar alloy, transition glass for 3.3 sealing and 3.3 borosilicate glass, the temperature reduction speed is high, and the novel glass is easy to crack. Aiming at the defect, the glass is fully preheated for 1-3 minutes by big fire before sealing, and then is sealed after being preheated and melted by a small fire head.
step 2, hanging a circle of outer glass beads on the outer side of the kovar alloy sealing part; the width of the outer glass bead is 3mm-6 mm.
Step 3, after hanging the inner glass bead and the outer glass bead, sealing the outer glass tube and the kovar alloy, and annealing by using a fire head for 2-10 minutes after sealing;
And 4, sealing two ends of a long glass tube with a kovar-glass sealing piece respectively by using a flame fusion sealing method.
And 5, annealing the sealed glass shell whole tube in an oven, and finishing the sealing work of the outer glass tube after the annealing is finished, wherein the annealing temperature is 500-600 ℃, and the temperature is kept for 10-60 min.
The structural schematic diagram of the sealed outer glass tube is shown in fig. 1, wherein the label 1 is kovar alloy, and the label 2 is borosilicate glass with the expansion coefficient of 4.8 multiplied by 10 -6/DEG C-5.1 multiplied by 10 -6/DEG C.
Claims (8)
1. A sealing method of an outer glass tube for a medium-high temperature vacuum heat collecting tube is characterized by comprising the following steps: the method specifically comprises the following steps:
Step 1, after cleaning the kovar alloy, carrying out hydrogen burning treatment in a hydrogen furnace, wherein a dark gray oxide layer is formed on the surface of the kovar alloy after hydrogen burning;
Step 2, preheating the outer glass tube and the kovar alloy after hydrogen burning by using a fire head, and hanging a circle of inner glass beads on the inner wall of the sealing part of the kovar alloy when the sealing part of the outer glass tube is fully melted and an oxide layer on the surface of the kovar alloy is in a molten state;
Step 3, hanging a circle of outer glass beads on the outer side of the kovar alloy sealing part;
step 4, sealing the outer glass tube and the kovar alloy, and annealing by using a fire head after sealing;
step 5, sealing two ends of a glass tube with a kovar-glass sealing piece respectively by using a flame fusion sealing method;
And 6, annealing the whole glass tube sealed in the step 5 in an oven, and finishing the sealing work of the outer glass tube after the annealing is finished.
2. The sealing method of the outer glass tube for the middle and high temperature vacuum heat collecting tube according to claim 1, wherein: the hydrogen burning treatment temperature in the step 1 is 800-1300 ℃.
3. The sealing method of the outer glass tube for the middle and high temperature vacuum heat collecting tube according to claim 1, wherein: the width of the inner glass bead in the step 2 is 3-6 mm.
4. the sealing method of the outer glass tube for the middle and high temperature vacuum heat collecting tube according to claim 1, wherein: and in the step 3, the width of the outer glass beads is 3-6 mm.
5. The sealing method of the outer glass tube for the middle and high temperature vacuum heat collecting tube according to claim 1, wherein: and the annealing time in the step 4 is 2-10 minutes.
6. The sealing method of the outer glass tube for the middle and high temperature vacuum heat collecting tube according to claim 1, wherein: the annealing temperature in the step 6 is 500-600 ℃, and the heat preservation time is 10-60 min.
7. The sealing method of the outer glass tube for the middle and high temperature vacuum heat collecting tube according to claim 1, wherein: the kovar alloy is 4J29 kovar alloy.
8. The method for sealing an outer glass tube of a medium-high temperature vacuum heat collecting tube according to claim 1, wherein the outer glass tube is made of borosilicate glass having an expansion coefficient of 4.8 x 10 -6/° C-5.1 x 10 -6/° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910903743.2A CN110553407A (en) | 2019-09-24 | 2019-09-24 | Sealing method of outer glass tube for medium-high temperature vacuum heat collecting tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910903743.2A CN110553407A (en) | 2019-09-24 | 2019-09-24 | Sealing method of outer glass tube for medium-high temperature vacuum heat collecting tube |
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| CN110553407A true CN110553407A (en) | 2019-12-10 |
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| CN201910903743.2A Withdrawn CN110553407A (en) | 2019-09-24 | 2019-09-24 | Sealing method of outer glass tube for medium-high temperature vacuum heat collecting tube |
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Citations (8)
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| CN101020598A (en) * | 2006-02-14 | 2007-08-22 | 江希年 | Glass-metal sealing process for vacuum heat collecting tube |
| 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 |
| CN102840702A (en) * | 2012-09-06 | 2012-12-26 | 北京工业大学 | External expansion joint type glass-metal sealing-in end socket structure with internal shielding cover |
| CN202993623U (en) * | 2012-11-21 | 2013-06-12 | 山东禄禧新能源科技有限公司 | Metal heat tube type vacuum solar collector tube utilizing sealing technology |
| CN103193380A (en) * | 2013-03-19 | 2013-07-10 | 深圳职业技术学院 | Method for sealing metal and glass for high/medium-temperature solar evacuated collector tube |
| CN103408220A (en) * | 2013-07-13 | 2013-11-27 | 北京工业大学 | Trench type photo-thermal utilization high-temperature heat collection pipe end head sealing structure |
| JP2015014444A (en) * | 2013-07-08 | 2015-01-22 | 株式会社豊田自動織機 | Heat collection pipe |
| CN106865978A (en) * | 2017-03-29 | 2017-06-20 | 沧州天瑞星光热技术有限公司 | A kind of middle Pyrex and its application |
-
2019
- 2019-09-24 CN CN201910903743.2A patent/CN110553407A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020598A (en) * | 2006-02-14 | 2007-08-22 | 江希年 | Glass-metal sealing process for vacuum heat collecting tube |
| 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 |
| CN102840702A (en) * | 2012-09-06 | 2012-12-26 | 北京工业大学 | External expansion joint type glass-metal sealing-in end socket structure with internal shielding cover |
| CN202993623U (en) * | 2012-11-21 | 2013-06-12 | 山东禄禧新能源科技有限公司 | Metal heat tube type vacuum solar collector tube utilizing sealing technology |
| CN103193380A (en) * | 2013-03-19 | 2013-07-10 | 深圳职业技术学院 | Method for sealing metal and glass for high/medium-temperature solar evacuated collector tube |
| JP2015014444A (en) * | 2013-07-08 | 2015-01-22 | 株式会社豊田自動織機 | Heat collection pipe |
| CN103408220A (en) * | 2013-07-13 | 2013-11-27 | 北京工业大学 | Trench type photo-thermal utilization high-temperature heat collection pipe end head sealing structure |
| CN106865978A (en) * | 2017-03-29 | 2017-06-20 | 沧州天瑞星光热技术有限公司 | A kind of middle Pyrex and its application |
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Application publication date: 20191210 |
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| WW01 | Invention patent application withdrawn after publication |