CN102276166B - Seal method of straight-through solar heat-collecting tube - Google Patents
Seal method of straight-through solar heat-collecting tube Download PDFInfo
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Abstract
A seal method of a straight-through solar heat-collecting tube. According to the seal method provided by the invention, a metal tube with a thick wall is disposed inside a coil of high frequency electromagnetic induction equipment so as to seal glass and metal. The straight-through solar heat-collecting tube is sealed by the glass and Kovar alloy which comprise the following components of: by weight, 10.5-11.5% of B2O3, 5-6.8% of Al2O3, 6.4-7% of Na2O, 0.1-1.2% of K2O, 0.1-1% of BaO, 0.4-1.5% of CaO, and the balance being SiO2. The Kovar alloy and the glass are sealed to form an internal-external clamping seal structure which has good seal strength. Due to the matching seal of glass and metal, the seal method provided by the invention has a simple technology without the use of intermediate glass and is used to solve the problem that the glass is hard to seal due to its high softening temperature. By the adoption of the method, the seal efficiency is high and annealing can be timely carried out. In addition, the method provided by the invention is suitable for large-scale industrial production and manufacture.
Description
Technical field
The present invention relates to a kind of straight way type solar collector tube glass-to-metal seal method, particularly a kind of method of the high-temperature solar thermal-collecting tube glass-to-metal seal for groove type solar light and heat collection system.
Background technology
Straight way type solar collector tube is mainly used in groove type solar light and heat collection system, by the parabolic mirror that can follow the tracks of the sun, incident beam is focused on this thermal-collecting tube, and thermal-collecting tube absorbs sunlight heating intraductal working medium, thereby produces high-temperature steam.Straight way type solar collector tube generally comprises the metal inner pipe with selective absorbing radiation coating and is looped around the Glass tubing outside metal inner pipe, because the coefficient of expansion between Glass tubing and metal inner pipe is different different with working temperature, poor by being positioned at the axial expansion that the corrugated tube at two ends is alleviated both between Glass tubing and metal inner pipe, in order to reduce thermosteresis and to prevent selective absorbing film oxidation, between Glass tubing and metal inner pipe, need to vacuumize, therefore between corrugated tube and Glass tubing, there is the glass-to-metal seal link of most critical.The general long 4 meters of left and right of this thermal-collecting tube, metal inner pipe external diameter is in 70mm left and right, glass tube external diameter is at 115-125mm, thermal-collecting tube long-time running temperature is more than 300 DEG C, and be in the harsh environment in field, transmittance to glass, heat-resisting, water-fast, acidproof and alkali resistance are had relatively high expectations, and this glass must can form reliable sealing-in with metal simultaneously, not only to meet the requirement of vacuum and high temperature, and frequent alternation that can withstand temp.
In general straight way type solar collector tube, generally adopt high-boron-silicon glass (Pyrex glass), its coefficient of expansion is 3.3 × 10
-6/ K, owing to there is no at present the metal more consistent with the high borosilicate coefficient of expansion, is difficult to form the glass and the reliable sealing-in of metal that are applied to straight way type solar collector tube.Patent CN1262248A has proposed a kind of glass and metal heat pressing encapsulation method, it belongs to Solid State Welding of Material technology, the solid-state scolder of low melting point is placed between kovar alloy end cap and high-boron-silicon glass pipe flange as lead or aluminium, solid-state scolder is heated to when softening, utilize cylinder to apply surge pressure to kovar alloy end cap rapidly, and then interatomic phase mutual diffusion occurs realize glass and be connected with metal, reach seal request.This kind of straight way type solar collector tube is owing to adopting low-melting scolder, and glass-to-metal seal is subject to the restriction of use temperature.
In US Patent No. 6324870, proposing a kind of employing high-boron-silicon glass (Pyrex glass) is 17 × 10 with the coefficient of expansion
-6the stainless steel of/K carries out the method for unmatched sealing, the stainless steel of high expansion coefficient is processed into very thin sharp-crested (being less than 0.1mm), then heating and high-boron-silicon glass carry out heat-sealablely, and the stainless steel plastoelastic deformation by thin-walled is alleviated the thermal stresses after sealing-in.But from 9 trough type solar power generation station discoveries in service of the U.S., this kind of method is after straight way type solar collector tube application, because long-term repeated stress causes at high load region mechanical failure, there is every year the crackle rate of 3%-5% in sealing-in place glass, significantly reduce trough type solar power generation efficiency, larger financial loss has been caused in slot type power station.
The patent of invention of CN100513926C has proposed a kind of high-temperature solar thermal-collecting tube and manufacturing process thereof, and DM308 glass and kovar alloy that this thermal-collecting tube adopts the coefficient of expansion relatively to approach carry out matched seal.But DM308 glass water tolerance is poor, and should not manufacture on a large scale, for nearly 4 meters of long Glass tubings in straight way type solar collector tube, can only adopt this kind of glass of a part, then utilize the method for multistage transitional glass sealing-in that short DM308 Glass tubing and long high-boron-silicon glass pipe are sealed up, realize 4 meters long glass outer tubes and make.But this kind of method is because transitional glass seam is more, and sealing process is comparatively complicated, and not acid-alkali-corrosive-resisting of transitional glass, and production efficiency is lower, and large-scale industrial production is restricted.
CN101602579A patent of invention proposes a kind of heat-sealable technique of metal-glass type solar vacuum heat-collecting pipe, adopt high-frequency electromagnetic induction heating means to realize the hot melt sealing-in of glass and metal, this sealing-in mode effect in the time carrying out the lower glass-to-metal seal of softening temperature is better, but for the higher glass of softening temperature, because the area of metal and glass contact is less, the simple metal end that relies on makes to the heat conduction of glass that glass is softening or the fusion time is long, even occur metal temperature to reach a high temperature the limit and glass temperature does not reach the problem of molten state, therefore be difficult to effective sealing-in for the high glass of softening temperature.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method for sealing for straight way type solar collector tube is provided.The Glass tubing of straight way type solar collector tube of the present invention adopts the glass comparatively mating with the kovar alloy coefficient of expansion to make, and this glass transmittance is high, water-fast, acidproof and alkaline resistance properties is good.The technical scheme that the sealing method of straight way type solar collector tube of the present invention adopts is, in the coil of high-frequency electromagnetic induction equipment, thick-wall metal pipes is set, and to glass and METAL HEATING PROCESS sealing-in, and forms curb pins seal structure, has good sealing strength.Method for sealing of the present invention is owing to being matched seal, and technique is simple, without using transitional glass, and has solved the high-leveled and difficult problem with sealing-in of glass transition temperature, and this sealing-in efficiency is high, can anneal in time, is adapted to large-scale industrial production and makes.
To achieve these goals, the Glass tubing of thermal-collecting tube of the present invention adopts glass and the kovar alloy with following component (weight percent) directly to carry out sealing-in:
B
2O
3：10.5％-11.5％
Al
2O
3：5％-6.8％
Na
2O：6.4％-7％
K
2O：0.1-1.2％
BaO：0.1％-1％
CaO：0.4％-1.5％
SiO
2surplus.
Through experiment measuring; acidproof (DIN 12116) grade of described glass is S1; alkaline-resisting (ISO 695) grade is A2; water-fast (GBT 6582-1997) grade HGB1; glass transmittance reaches more than 91%; above-mentioned performance can meet the performance requriements of straight way type solar collector tube to glass outer tube; and described glass has good cold-hot impact property; can realize the mass-producing of Large Diameter Pipeline, long tube produces; therefore can substitute transitional glass sealing-in, can adopt a kind of glass to produce the glass homogeneous tube of 4 meters long completely.
Described glass swelling coefficient is 4.9 × 10
-6/ K left and right, differs and is less than 10% with the kovar alloy coefficient of expansion.Will be higher than DM308 glass due to this kind of glass and kovar alloy sealing temperature and annealing temperature, therefore original method for sealing is difficult to realize the efficient sealing-in of described glass and kovar alloy.And the sealing temperature of described glass and annealing cooling need accurately to control, after guarantee sealing-in, do not burst and there is good sealing strength.
The sequence of process steps of the straight way type solar collector tube method for sealing that the present invention proposes is as follows:
1) kovar alloy ring is placed in the coil of high-frequency electromagnetic induction equipment;
2) by one section of thick-wall metal pipes coaxial sleeve outside described kovar alloy ring, and described thick-wall metal pipes is positioned at the coil of high-frequency electromagnetic induction equipment, the coil three of described thick-wall metal pipes, kovar alloy ring and high-frequency electromagnetic induction equipment does not all contact each other;
3) open high-frequency electromagnetic induction equipment, adopt electromagnetic induction heating mode first by described thick-wall metal pipes and the heating of kovar alloy ring, control the temperature of kovar alloy ring between 800-950 DEG C, 1-15 minute holds time;
4) Glass tubing is aligned and contacted with kovar alloy ring, continue heating, keeping kovar alloy ring temperature is 850 DEG C-1050 DEG C, until with the glass melting of kovar alloy articulating synapsis after, directly kovar alloy ring is inserted in the tube wall of Glass tubing, depth of penetration is 3-8mm;
5) reduce electromagnetic induction heating power, maintain thick-wall metal pipes temperature at 450-700 DEG C, time 10-60 minute, taps into row annealing to Glass tubing and kovar alloy ring seal;
6) be slow cooling to room temperature, rate of temperature fall per minute is less than 10 DEG C.
Described method for sealing, is to utilize high-frequency electromagnetic induction heating installation direct heating thick-wall metal pipes and kovar alloy ring, first kovar alloy ring is carried out to pre-oxidation treatment.Described pre-oxidation treatment, is due to glass and the own wettability of metal bad, need in advance kovar alloy ring be heated to certain hour and temperature, makes surface oxidation form layer oxide film.This layer of oxide film is the key component of glass and melts combine, need to control temperature and time parameter, guarantee glass-to-metal seal intensity.Through a large amount of oxidation experiments, the described kovar alloy ring preoxidation layer weightening finish that is applicable to this kind of glass is 0.3-0.8mg/cm
2, after such zone of oxidation and glass sealing, there is at least tensile strength and the good resistance to air loss of 2MPa.
After the preoxidation of kovar alloy ring, Glass tubing is aligned and contacted with kovar alloy ring, continue to utilize high-frequency electromagnetic induction heating installation to thick-wall metal pipes and the heating of kovar alloy ring, make kovar alloy ring temperature reach 850 DEG C-1050 DEG C.By thick-wall metal pipes, to Glass tubing lower surface radiation heating, and the heat conduction of kovar alloy ring to Glass tubing lower surface, by after the contact part melting of Glass tubing lower end, is directly inserted into kovar alloy ring in glass tube walls, forms inside and outside wall clamp.Described inside and outside wall clamp, can cut down on the inside and outside wall of alloy hoop sealing-in place all sealings by fusing has glass, and sealing-in tensile property is like this good, and resistance to air loss is also better, and the life-span is long.Due to the coefficient of expansion of this kind of glass and the coefficient of expansion of kovar alloy ring slightly variant, resistance to compression and the tensile strength of glass are poor, experiment shows, 1.5mm at least of the thickness of glass of sealing-in on kovar alloy ring inner and outer wall, guarantee kovar alloy and described glass have higher sealing strength.
After kovar alloy ring and described Glass tubing sealing-in, reduce high-frequency electromagnetic induction heating installation power, maintain thick-wall metal pipes temperature within the scope of 450-700 DEG C, time 10-60 minute, Glass tubing and kovar alloy ring seal are tapped into row annealing, then be less than 10 DEG C according to rate of temperature fall per minute and be slow cooling to room temperature, complete sealing-in process.
Described thick-wall metal pipes is ferromagnetic substance, and this thick-wall metal pipes height is 30-80mm, and wall thickness is 5-30mm.By adopting thick-wall metal pipes coaxial sleeve outside kovar alloy ring, due to described glass transition temperature and annealing temperature higher, on the one hand described thick-wall metal pipes can direct heating glass sealing part, ensure that glass can Flashmelt, avoided kovar alloy by superheated, and strengthened the heating uniformity of glass, after completing, sealing-in directly anneals on the other hand, after preventing sealing-in, fast cooling causes sealing-in to damage, and has reduced the use of annealing furnace, convenient and swift.
With during formation of glass sheets region, the wall thickness of described kovar alloy ring is 0.6mm-1.5mm, being sealed with to be like this beneficial to increases physical strength and work-ing life of sealing-in place.
Another kind method is that kovar alloy ring is being produced thin-walled edge of a knife shape with during formation of glass sheets region, and its thin-walled edge of a knife tapering is less than 5 °, and the outermost edge thickness of the thin-walled edge of a knife is 0.1-0.6mm.Through experiment, the unrelieved stress that Glass tubing described in this sealing-in measure can reduce greatly and kovar alloy ring seal connect, increase the binding ability of sealing-in place, and this kind of thin-walled edge of a knife wall thickness between 0.1-0.6mm just can, the processing and the sealing-in that are less than the 0.1mm thin-walled edge of a knife with respect to wall thickness all comparatively easily realize.
Brief description of the drawings
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is Glass tubing and kovar alloy ring high-frequency electromagnetic induction sealing-in schematic diagram involved in the present invention;
Fig. 2 is that Glass tubing and kovar alloy ring seal involved in the present invention connects sectional view;
Fig. 3 is Glass tubing of the present invention and kovar alloy ring thin-walled knife seal sectional view;
In figure: the coil of 1 Glass tubing, 2 kovar alloy rings, 3 high-frequency electromagnetic induction equipment, 4 thick-wall metal pipes, 5 Glass tubing fixtures, 6 high-frequency electromagnetic induction sealing-in supports.
Embodiment
Figure 1 shows that method for sealing of the present invention.As shown in Figure 1, kovar alloy ring 2 is coaxially placed in the coil 3 of high-frequency electromagnetic induction equipment, and thick-wall metal pipes 4 is also enclosed within kovar alloy ring 2 outsides coaxially, in coil 3, and heating thick-wall metal pipes 4 and kovar alloy ring 2.After 2 preoxidation of kovar alloy ring, with Glass tubing fixture 5, Glass tubing 1 is fixing, and control Glass tubing 1 by high-frequency electromagnetic induction sealing-in support 6 and align and contact with kovar alloy ring 2, by the radiation heating of thick-wall metal pipes 4 and the heat conduction of kovar alloy ring 2, Glass tubing 1 end is heated, after glass melting, move down Glass tubing 1, kovar alloy ring 2 is inserted in the tube wall of Glass tubing 1.Then utilize thick-wall metal pipes 4 to anneal to sealing-in, complete sealing-in.
Embodiment 1
As shown in Figure 2, in the present embodiment, there is following component (weight percent): B for making the glass of high-temperature vacuum heat-collecting tube
2o
3: 10.5%, Al
2o
3: 5%, Na
2o:7%, K
2o:0.1%, BaO:1%, CaO:1.5%, SiO
2surplus, its coefficient of expansion and the kovar alloy coefficient of expansion differ in 6% left and right.The external diameter of Glass tubing 1 is 125mm, wall thickness 3mm.The external diameter of kovar alloy ring 2 is 118mm, height 30mm, with the wall thickness d in during formation of glass sheets region be 0.6mm.In the present embodiment, first kovar alloy ring 2 is placed on coaxially in the coil 3 of high-frequency electromagnetic induction equipment, thick-wall metal pipes 4 is also enclosed within kovar alloy ring 2 outsides coaxially, in coil 3.This thick-wall metal pipes height is 80mm, and wall thickness is 5mm, open high-frequency electromagnetic induction equipment, by the coil 3 of high-frequency electromagnetic induction equipment, thick-wall metal pipes 4 and kovar alloy ring 2 are first heated, the Pre oxidation of kovar alloy ring 2 is 950 DEG C, and 1 minute time, the preoxidation layer weightening finish of this kovar alloy ring 2 is 0.8mg/cm
2, then by Glass tubing fixture 5, Glass tubing 1 is fixed, and control Glass tubing 1 by high-frequency electromagnetic induction sealing-in support 6 and align and contact with kovar alloy ring 2, by the radiation heating of thick-wall metal pipes 4 and the heat conduction of kovar alloy ring 2, Glass tubing 1 end is heated, make the temperature of kovar alloy ring 2 reach 1000 DEG C, after glass melting Deng Glass tubing 1 and kovar alloy ring 2 contact positions, move down Glass tubing 1, kovar alloy ring 2 is inserted in the tube wall of Glass tubing 1, form inside and outside wall clamp, kovar alloy ring 2 depth of penetration L are 8mm, and on kovar alloy ring 2 sealing-in place inner and outer walls, the glass wall thickness of sealing-in is all 1.5mm, then reduce electromagnetic induction heating power, maintain the temperature of thick-wall metal pipes 4 at 600 DEG C, 40 minutes time, sealing-in is annealed, finally control rate of temperature fall and be per minute and be less than 5 DEG C and be reduced to room temperature, complete sealing-in.
Embodiment 2:
In the present embodiment, there is following component (weight percent): B for making the glass of high-temperature vacuum heat-collecting tube
2o
3: 11%, Al
2o
3: 5.4%, Na
2o:6.5%, K
2o:0.5%, BaO:0.5%, CaO:0.5%, SiO
2surplus, its coefficient of expansion and the kovar alloy coefficient of expansion differ in 5% left and right.The external diameter of Glass tubing 1 is 120mm, wall thickness 3mm.The external diameter of kovar alloy ring 2 is 118mm, height 26mm, with the wall thickness d in during formation of glass sheets region be 1mm.In the present embodiment, first kovar alloy ring 2 is placed on coaxially in the coil 3 of high-frequency electromagnetic induction equipment, thick-wall metal pipes 4 is also enclosed within kovar alloy ring 2 outsides coaxially, in coil 3.This thick-wall metal pipes height is 30mm, and wall thickness is 20mm, open high-frequency electromagnetic induction equipment, by the coil 3 of high-frequency electromagnetic induction equipment, thick-wall metal pipes 4 and kovar alloy ring 2 are first heated, the Pre oxidation of kovar alloy ring 2 is 800 DEG C, and 3 minutes time, the preoxidation layer weightening finish of this kovar alloy ring 2 is 0.3mg/cm
2, then by Glass tubing fixture 5, Glass tubing 1 is fixed, and control Glass tubing 1 by high-frequency electromagnetic induction sealing-in support 6 and align and contact with kovar alloy ring 2, by the radiation heating of thick-wall metal pipes 4 and the heat conduction of kovar alloy ring 2, Glass tubing 1 end is heated, make the temperature of kovar alloy ring 2 reach 950 DEG C, after glass melting Deng Glass tubing 1 and kovar alloy ring 2 contact positions, move down Glass tubing 1, kovar alloy ring 2 is inserted in the tube wall of Glass tubing 1, form inside and outside wall clamp, kovar alloy ring 2 depth of penetration L are 6mm, and on kovar alloy ring 2 sealing-in place inner and outer walls, the glass wall thickness of sealing-in is all 2mm, then reduce electromagnetic induction heating power, maintain the temperature of thick-wall metal pipes 4 at 700 DEG C, 20 minutes time, sealing-in is annealed, finally control rate of temperature fall and be per minute and be less than 5 DEG C and be reduced to room temperature, complete sealing-in.
Embodiment 3:
In the present embodiment, there is following one-tenth and be grouped into (weight percent): B for making the glass of high-temperature vacuum heat-collecting tube
2o
3: 11.5%, Al
2o
3: 6.8%, Na
2o:7%, K
2o:1.2%, BaO:0.1%, CaO:0.4%, SiO
2surplus, its coefficient of expansion and the kovar alloy coefficient of expansion differ in 8% left and right.The external diameter of Glass tubing 1 is 115mm, wall thickness 3mm.The external diameter of kovar alloy ring 2 is 118mm, height 35mm, with the wall thickness d in during formation of glass sheets region be 1.5mm.In the present embodiment, first kovar alloy ring 2 is placed on coaxially in the coil 3 of high-frequency electromagnetic induction equipment, thick-wall metal pipes 4 is also enclosed within kovar alloy ring 2 outsides coaxially, in coil 3.This thick-wall metal pipes height is 50mm, and wall thickness is 30mm, open high-frequency electromagnetic induction equipment, coil 3 by high-frequency electromagnetic induction equipment first heats thick-wall metal pipes 4 and kovar alloy ring 2, the Pre oxidation of kovar alloy ring 2 is 800 DEG C, and 15 minutes time, the preoxidation layer weightening finish of this kovar alloy ring 2 is 0.65mg/cm
2, then by Glass tubing fixture 5, Glass tubing 1 is fixed, and control Glass tubing 1 by high-frequency electromagnetic induction sealing-in support 6 and align and contact with kovar alloy ring 2, by the radiation heating of thick-wall metal pipes 4 and the heat conduction of kovar alloy ring 2, Glass tubing 1 end is heated, make the temperature of kovar alloy ring 2 reach 1050 DEG C, after glass melting Deng Glass tubing 1 and kovar alloy ring 2 contact positions, move down Glass tubing 1, kovar alloy ring 2 is inserted in the tube wall of Glass tubing 1, form inside and outside wall clamp, kovar alloy ring 2 depth of penetration L are 3mm, and on kovar alloy ring 2 sealing-in place inner and outer walls, the glass wall thickness of sealing-in is all 1.8mm, then reduce electromagnetic induction heating power, maintain the temperature of thick-wall metal pipes 4 at 450 DEG C, 60 minutes time, sealing-in is annealed, finally control rate of temperature fall and be per minute and be less than 10 DEG C and be reduced to room temperature, complete sealing-in.
Embodiment 4:
As shown in Figure 3, in the present embodiment, there is following component (weight percent): B for making the glass of high-temperature vacuum heat-collecting tube
2o
3: 10.5%, Al
2o
3: 5%, Na
2o:7%, K
2o:0.1%, BaO:0.2%, CaO:1.5%, SiO
2surplus, its coefficient of expansion and the kovar alloy coefficient of expansion differ in 10% left and right.The external diameter of Glass tubing 1 is 120mm, wall thickness 3mm.The external diameter of kovar alloy ring 2 is 118mm, and kovar alloy ring 2 is being produced the thin-walled edge of a knife with glass sealing fusion area, 1 ° of thin-walled edge of a knife tapering, and the outermost edge thickness d of the thin-walled edge of a knife is 0.1mm.In the present embodiment, first kovar alloy ring 2 is placed on coaxially in the coil 3 of high-frequency electromagnetic induction equipment, thick-wall metal pipes 4 is also enclosed within kovar alloy ring 2 outsides coaxially, in coil 3.This thick-wall metal pipes height is 60mm, and wall thickness is 25mm, open high-frequency electromagnetic induction equipment, coil 3 by high-frequency electromagnetic induction equipment first heats thick-wall metal pipes 4 and kovar alloy ring 2, the Pre oxidation of kovar alloy ring 2 is 900 DEG C, and 1 minute time, the preoxidation layer weightening finish of this kovar alloy ring 2 is 0.48mg/cm
2, then by Glass tubing fixture 5, Glass tubing 1 is fixed, and control Glass tubing 1 by high-frequency electromagnetic induction sealing-in support 6 and align and contact with kovar alloy ring 2, by the radiation heating of thick-wall metal pipes 4 and the heat conduction of kovar alloy ring 2, Glass tubing 1 end is heated, make the temperature of kovar alloy ring 2 reach 1050 DEG C, after glass melting Deng Glass tubing 1 and kovar alloy ring 2 contact positions, move down Glass tubing 1, kovar alloy ring 2 is inserted in the tube wall of Glass tubing 1, form inside and outside wall clamp, kovar alloy ring 2 depth of penetration L are 8mm, and on kovar alloy ring 2 sealing-in place inner and outer walls, the glass wall thickness of sealing-in is all 2.2mm, then reduce electromagnetic induction heating power, maintain the temperature of thick-wall metal pipes 4 at 600 DEG C, 30 minutes time, sealing-in is annealed, finally control rate of temperature fall and be per minute and be less than 3 DEG C and be reduced to room temperature, complete sealing-in.
Claims (7)
1. a straight way type solar collector tube method for sealing, is characterized in that, the sequence of process steps of described method for sealing is as follows:
1) kovar alloy ring (2) is placed in the coil (3) of high-frequency electromagnetic induction equipment;
2) by one section of thick-wall metal pipes (4) coaxial sleeve outside described kovar alloy ring (2), described thick-wall metal pipes (4) be ferromagnetic substance make, it is highly 30-80mm, wall thickness is 5-30mm; Described thick-wall metal pipes (4) is positioned at the coil (3) of high-frequency electromagnetic induction equipment; Coil (3) three of described thick-wall metal pipes (4), kovar alloy ring (2) and high-frequency electromagnetic induction equipment does not all contact each other;
3) open high-frequency electromagnetic induction equipment, adopt electromagnetic induction heating mode by described thick-wall metal pipes (4) and kovar alloy ring (2) heating, keep the temperature of kovar alloy ring (2) between 800-950 DEG C, 1-15 minute holds time;
4) with Glass tubing fixture (5), Glass tubing (1) is fixing, and align and contact with kovar alloy ring (2) by high-frequency electromagnetic induction sealing-in support (6) control Glass tubing (1), continue heating, controlling kovar alloy ring (2) temperature is 850 DEG C-1050 DEG C, by thick-wall metal pipes (4) to Glass tubing (1) lower surface radiation heating, and the heat conduction of kovar alloy ring (2) to Glass tubing (1) lower surface, after the glass melting contacting with kovar alloy ring (2) until Glass tubing (1), directly kovar alloy ring (2) is inserted in the tube wall of Glass tubing (1), depth of penetration is 3-8mm, form inside and outside wall clamp,
5) reduce electromagnetic induction heating power, maintain thick-wall metal pipes (4) temperature at 450-700 DEG C, time 10-60 minute, anneals;
6) be slow cooling to room temperature, rate of temperature fall per minute is less than 10 DEG C.
2. according to straight way type solar collector tube method for sealing claimed in claim 1, it is characterized in that, the component that the glass that described Glass tubing adopts forms is by weight percentage:
B
2O
3：10.5％-11.5％
Al
2O
3：5％-6.8％
Na
2O：6.4％-7％
K
2O：0.1-1.2％
BaO：0.1％-1％
CaO：0.4％-1.5％
SiO
2: surplus.
3. according to straight way type solar collector tube method for sealing claimed in claim 2, it is characterized in that, the coefficient of expansion of described glass and the kovar alloy coefficient of expansion differ in 10%.
4. according to straight way type solar collector tube method for sealing claimed in claim 1, it is characterized in that all 1.5mm at least of the thickness of glass of sealing-in on the inner and outer wall of described kovar alloy ring (2).
5. according to straight way type solar collector tube method for sealing claimed in claim 1, it is characterized in that, described kovar alloy ring (2) with Glass tubing (1) sealing-in before first carry out preoxidation, the weightening finish of the preoxidation layer of kovar alloy ring (2) is 0.3-0.8mg/cm
2.
6. according to straight way type solar collector tube method for sealing claimed in claim 1, it is characterized in that, with described kovar alloy ring (2) wall thickness in during formation of glass sheets region be 0.6mm-1mm.
7. according to straight way type solar collector tube method for sealing claimed in claim 1, it is characterized in that, described kovar alloy ring (2) is being produced thin-walled edge of a knife shape with during formation of glass sheets region, and its thin-walled edge of a knife tapering is less than 5 °, and the outermost edge thickness of the thin-walled edge of a knife is 0.1-0.6mm.
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| CN102276166A (en) | 2011-12-14 |
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