CN111141038A - Three-tube butt joint structure and method of solar heat collection tube - Google Patents
Three-tube butt joint structure and method of solar heat collection tube Download PDFInfo
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- CN111141038A CN111141038A CN202010046949.0A CN202010046949A CN111141038A CN 111141038 A CN111141038 A CN 111141038A CN 202010046949 A CN202010046949 A CN 202010046949A CN 111141038 A CN111141038 A CN 111141038A
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- 210000001503 joint Anatomy 0.000 title claims abstract description 36
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- 238000007789 sealing Methods 0.000 claims description 45
- 238000009833 condensation Methods 0.000 claims description 44
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- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 17
- 238000003466 welding Methods 0.000 abstract description 5
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- 229910021641 deionized water Inorganic materials 0.000 description 7
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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
- F24S10/90—Solar heat collectors using working fluids using internal thermosiphonic circulation
- F24S10/95—Solar heat collectors using working fluids using internal thermosiphonic circulation having evaporator sections and condenser sections, e.g. heat pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/10—Details of absorbing elements characterised by the absorbing material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/60—Details of absorbing elements characterised by the structure or construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/70—Sealing means
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Joining Of Glass To Other Materials (AREA)
Abstract
The invention provides a three-tube butt joint structure and a method of a solar heat collecting tube, wherein the three-tube butt joint structure is formed by oppositely welding an inner tube, a cover glass tube and a condensing section, and the cover glass tube and the condensing section are connected with each other at an oblique angle of 120-150 degrees; the wall thickness of the joint of the inner pipe and the condensing section is reduced to 60% -90% of the wall thickness of other parts of the inner pipe and the condensing section. The invention greatly improves the installation cheapness and reliability of the all-glass heat pipe type vacuum solar heat collecting pipe, and effectively reduces the occurrence of installation damage and installation accidents, thereby effectively reducing the installation damage rate of the all-glass heat pipe type vacuum solar heat collecting pipe to 0.05 percent from 1.2 percent. The efficiency of the system is effectively improved.
Description
Technical Field
The invention relates to a solar heat collecting pipe, in particular to a three-pipe butt joint structure and a three-pipe butt joint method of an all-glass heat pipe vacuum solar heat collecting pipe with a gradual change structure.
Background
The all-glass vacuum solar heat collecting tube has been developed for more than 30 years, forms the field of solar photo-thermal utilization, and is widely applied to solar water heating application.
The all-glass heat pipe type solar heat collecting pipe adopts the phase-change heat exchange technology, and no water exists in the pipe, so that the problems of low starting speed, low heat efficiency, easy scaling or damage caused by icing caused by water in the common all-glass vacuum heat collecting pipe are solved. The characteristics of scale prevention, freeze prevention, damage and leakage prevention are realized, the solar energy photo-thermal heating water heater is gradually accepted by solar energy photo-thermal heating markets, and the popularization and demonstration application are started.
At present, the main structure of the all-glass heat pipe type vacuum solar heat collection pipe is shown in fig. 1, and the all-glass heat collection pipe is provided with an inner pipe 2, a cover glass pipe 5 and a condensation section 1, wherein the inner pipe 2 generally adopts a glass pipe with the outer diameter of 47mm, the cover glass pipe 5 generally adopts a glass pipe with the outer diameter of 58mm, and the condensation section 1 is equal to the inner pipe in diameter, so that a three-pipe butt joint structure is formed among the condensation section 1, the inner pipe 2 and the cover glass pipe 5.
The existing all-glass heat pipe type vacuum solar heat collecting pipe is particularly easy to form a step structure at the butt joint of three pipes, so that the stress concentration phenomenon is formed, the stress state is difficult to eliminate or even reduce through a general annealing process, and the heat collecting pipe at the butt joint of the three pipes is easy to damage due to the extrusion and collision of the step and a sealing ring of a solar water tank in the installation process.
The problems are not obvious when the all-glass heat pipe vacuum solar heat collecting pipe is in small market demands. However, with the demonstration and popularization of the solar photo-thermal heating market, the problems are obvious day by day, and the damage rate and the safety of the system during installation are seriously influenced.
Therefore, how to solve the problems of steps and stress caused by the structure and the process of the existing all-glass heat pipe type vacuum heat collecting pipe is one of the key problems of whether the existing all-glass heat pipe type solar heat collecting pipe can be widely applied in solar photo-thermal heating and one of the key problems of whether a solar photo-thermal heating system taking the all-glass heat pipe type solar heat collecting pipe as a core can be widely marketed is influenced.
Disclosure of Invention
The invention provides a three-pipe butt joint structure and a three-pipe butt joint method of a solar heat collecting pipe, aiming at solving the problems that the existing all-glass heat pipe type vacuum heat collecting pipe has steps and stress concentration at the butt joint of three pipes, so that whether the existing all-glass heat pipe type solar heat collecting pipe can be widely applied in solar photo-thermal heating and whether a solar photo-thermal heating system taking the all-glass heat pipe type solar heat collecting pipe as a core can be widely marketed are influenced.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a three tub of butt joint structures of solar energy collection pipe, three tub of butt joint structures constitute its characterized in that by the relative butt fusion of inner tube, cover glass pipe and condensation segment:
the cover glass tube is connected with the condensing section at an oblique angle of 120-150 degrees;
the wall thickness of the joint of the inner pipe and the condensing section is reduced to 60% -90% of the wall thickness of other parts of the inner pipe and the condensing section.
The three-tube butt joint structure of the solar heat collection tube, wherein: the total length of the wall thickness reduction areas of the inner pipe and the condensation section is not more than 10 mm.
The three-tube butt joint structure of the solar heat collection tube, wherein: the total length is 5-10 mm.
The three-tube butt joint structure of the solar heat collection tube, wherein: the wall thickness of the inclined part of the cover glass tube connected to the condensing section is reduced to 60% -90% of that of the other part.
The three-tube butt joint structure of the solar heat collection tube, wherein: and a fillet transition structure is formed at the joint of the cover glass tube and the inner tube.
A three-tube butt joint method of a solar heat collecting tube is characterized in that a ring seal of a condensation section and a ring seal of an inner tube assembly and an outer tube assembly are sealed together in a melting mode under the action of flame, the inner tube assembly and the outer tube assembly are an inner tube and a cover glass tube which are clamped and positioned together, and the three-tube butt joint method is characterized in that:
and under the state of melt sealing, the inner tube and the cover glass tube which are connected together by melt sealing are axially stretched opposite to the condensing section, so that the glass wall thicknesses of the inner tube, the condensing section and the cover glass tube at the position of the ring sealing opening are integrally thinned, and the step shape between the cover glass tube and the condensing section is changed into a gradual change structure inclined by 120-150 degrees.
The three-tube butt joint method of the solar heat collecting tube comprises the following steps: before the three pipes are butted, the condensing section is flared, and the thickness of the glass wall of the fusion sealing transition section is reduced through flaring.
The three-tube butt joint method of the solar heat collecting tube comprises the following steps: before the three pipes are butted, the inner pipe assembly and the outer pipe assembly are subjected to fusion sealing and thinning, namely, the pipe orifice of the inner pipe in a fusion state and the pipe orifice of the cover glass pipe are connected in a fusion sealing manner, and the thickness of the glass wall of the inner pipe and the cover glass pipe at the ring sealing port is thinned under the action of gas pressure by introducing gas into the cover glass pipe.
The three-tube butt joint method of the solar heat collecting tube comprises the following steps: the inner tube and the cover glass tube which are connected together in a sealing mode are opposite to the axial stretching length of the condensation section and are 5-10mm in length.
The three-tube butt joint method of the solar heat collecting tube comprises the following steps: the glass wall thickness of the inner tube, the condensing section and the cover glass tube at the position of the ring seal is reduced to 60% -90% of the wall thickness of other parts.
The invention greatly improves the installation cheapness and reliability of the all-glass heat pipe type vacuum solar heat collecting pipe, and effectively reduces the occurrence of installation damage and installation accidents, thereby effectively reducing the installation damage rate of the all-glass heat pipe type vacuum solar heat collecting pipe to 0.05 percent from 1.2 percent. The efficiency of the system is effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of a conventional all-glass heat pipe type evacuated collector tube;
FIG. 2 is a schematic structural diagram of a solar heat collecting tube provided by the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a process flow diagram of the present invention.
Description of reference numerals: a condensing section 1; an inner tube 2; a selective absorbing coating 3; a vacuum interlayer 4; a cover glass tube 5; a bracket 6; a getter (7); a liquid working medium 8; a fillet r; processing an inner pipe A; processing a cover glass tube B; condensing section processing C; d, processing a bracket; and E, sealing the three pipes by fusing.
Detailed Description
As shown in figure 2, the invention provides an all-glass heat pipe type vacuum heat collecting pipe, which is provided with a three-pipe butt joint structure consisting of an inner pipe 2, a cover glass pipe 5 and a condensation section 1, wherein a round head of the inner pipe 2 is fixed with the cover glass pipe 5 through a support 6, a getter 7 is arranged on the support 6, a vacuum interlayer 4 is arranged between the inner pipe 2 and the cover glass pipe 5, the outer wall of the inner pipe 2 is provided with a selective absorption coating 3, the inner parts of the inner pipe 2 and the condensation section 1 form a working medium cavity, a liquid working medium 8 is vacuumized and placed in the working medium cavity, and the volume ratio of the volume of the liquid working medium 8 to the volume of the working medium cavity is.
In order to reduce or even eliminate the stress concentration at the joint of the three pipes, as shown in fig. 2 and fig. 3, the invention adopts a structure that the cover glass pipe 5 and the condensation section 1 are connected by an oblique angle of 120-150 degrees, thereby realizing the gradual transition of the cover glass pipe 5 to the condensation section 1 in the diameter direction and eliminating the original structure of approximate right-angle steps.
Meanwhile, the wall thickness of the joint of the inner tube 2, the condensing section 1 and the cover glass tube 5 is reduced to 60-90% of the wall thickness of the other parts of the inner tube 2, the condensing section 1 and the cover glass tube 5; wherein the total length of the wall thickness reduction area of the inner tube 2 and the condensation section 1 is not more than 10mm, preferably 5-10mm, and most preferably 8 mm.
In addition, the invention also forms a small round corner r transition structure at the joint of the cover glass tube 5 and the inner tube 2.
The gradual change type three-tube butt joint structure is internally provided with a small arc structure and a thin-wall structure, so that the problem that the existing all-glass heat tube vacuum solar heat collecting tube steps collide with a sealing ring during installation is effectively solved, the heat collecting tube is easily inserted into a water tank, and an effective sealing structure of the sealing ring and a cover glass tube 5 is formed.
By adopting the designed gradual change length, the gradual change of the butt joint transition area of the three tubes can be effectively realized, and the influence on the sealing of the cover glass tube 5 and the sealing ring caused by the overlong gradual change length of the cover glass tube 5 is avoided.
And the stress problem of the gradual change area can be effectively weakened or even eliminated by the effective thinning design, so that the problem of stress damage caused by installation impact in the transition area is solved.
The design of the structure greatly improves the installation cheapness and reliability of the all-glass heat pipe type vacuum solar heat collecting pipe, and effectively reduces the installation damage and the installation accidents. Therefore, the damage rate of the vacuum solar heat collecting tube of the all-glass heat pipe is effectively reduced to 0.05 percent from 1.2 percent due to installation. The efficiency of the system is effectively improved.
In order to realize the gradual three-tube butt joint structure, a small arc structure and a thin-wall structure are arranged in the gradual three-tube butt joint structure, as shown in fig. 4, the invention provides a production process flow of the heat collecting tube, which mainly comprises the working procedures of inner tube processing A, cover glass tube processing B, condensing section processing C, bracket processing D, inner and outer tube assembly, three-tube melt sealing E, vacuum exhaust and the like.
The inner tube processing step A sequentially comprises the main steps of cutting to length and length, pulling a round head, cleaning, drying, degassing, coating, strengthening and the like.
The cutting length sizing is mainly characterized in that the length of the blank inner tube 2 is cut to the designed length range according to the designed process length of the inner tube 2, and the fused end cut is burned flat through high-temperature flame, so that the cut is round and neat.
The round head is drawn, mainly according to 2 button head sizes in the inner tube of design, through 2 one end of flame heating fusion inner tube to draw out 2 button heads in the inner tube through drawing equipment, and under the molten state, carry out the button head rounding.
The cleaning is mainly to carry out treatments such as oil removal and decontamination on the outer surface of the inner tube 2 by using a cleaning agent, and then to clean the cleaning agent on the outer surface of the inner tube 2 by using deionized water, so that the subsequent coating process is facilitated, and the bonding strength of a film substrate is improved.
And the drying is mainly to dry the deionized water on the surface of the cleaned inner tube 2 and remove water films and water molecules on the surface so as to be beneficial to vacuumizing before subsequent coating and improve the bonding strength of a film substrate.
The degassing is mainly to remove impurities and residual gas on the surface of the inner tube 2 by high-temperature baking and plasma bombardment under the vacuum condition, and to improve the surface temperature of the inner tube 2 of the heat collecting tube, so as to be beneficial to improving the coating quality and the film-substrate bonding strength.
The coating film is mainly formed by plating a selective absorption coating 3 comprising an infrared reflecting layer, a low resistance layer, a transition layer, a high resistance layer and an antireflection layer on the outer surface of the inner tube 2 by adopting more than one target material.
The strengthening process is mainly to carry out secondary strengthening on the selective absorption coating 3 through a high-temperature oxidation or plasma treatment process, so as to improve the performance and the high-temperature stability of the selective absorption coating 3.
And step B, the processing of the cover glass tube sequentially comprises the main processes of cutting to length and sizing, drawing a round head, punching a round head, combining a tail tube, necking the tail tube, cleaning, drying, mounting a support and the like.
The cutting length sizing of the working procedure B of processing the cover glass tube is mainly to cut the length of the blank cover glass tube 5 to the designed length range according to the length of the working procedure of designing the cover glass tube 5, and to burn the cut of the melting end seal by high-temperature flame to ensure the cut to be round.
And the round head drawing of the cover glass tube processing step B is mainly to heat and melt one end of the cover glass tube 5 by flame according to the designed round head size of the cover glass tube 5, draw out the round head of the cover glass tube 5 by drawing equipment and round the round head in a molten state.
And after the round head drawing process is completed, the round head is blown to the center of the round head by high-pressure gas with a certain diameter in a high-temperature molten state, a round hole is formed under the action of the high-pressure gas, and a regular round head hole is formed under the action of automatic rotation and gravity of the cover glass tube 5.
And the tail pipe of the processing step B of the cover glass pipe is connected into a round head hole 5 of the cover glass pipe in a sealing manner under the high-temperature condition.
And the tail pipe necking of the step B of processing the cover glass pipe refers to that after the step of tail pipe connection is finished, the tail pipe and the cover glass pipe 5 are connected, and the tail pipe and the cover glass pipe 5 are stretched and rotated to form a hole with the diameter of 3-5 mm. And the tail pipe with the wall thickness smaller than 1mm is reduced, so that the tail pipe can be killed after the heat collecting pipe exhausts.
And the cleaning of the processing B procedure of the cover glass tube is mainly to perform treatments of oil removal, decontamination and the like on the inner surface of the cover glass by using a cleaning agent, and then to clean the cleaning agent on the inner surface of the cover glass tube 5 by using deionized water.
And the drying of the processing B procedure of the cover glass tube is mainly to dry the deionized water on the surface of the cleaned cover glass tube 5 to remove water films and water molecules on the surface, so as to be beneficial to vacuumizing before subsequent film coating.
The support mounting process of the cover glass tube processing B process refers to that the support 6 is led into the tail part of the cover glass tube 5 from the opening of the cover glass tube 5.
And step D, the bracket processing mainly comprises the steps of forming and shearing, deburring, spot welding connection, bracket cleaning and getter spot welding.
The shaping and shearing refers to shearing and shaping according to the design shape of the bracket 6;
the deburring is carried out to remove burrs formed in the shearing process of the support 6 by a chemical method or a physical method, so that the burrs are prevented from scratching the inner surface of the cover glass tube 5 in the process of mounting the support.
The spot welding is to weld the two supports 6 together crosswise to form the basic support 6 structure.
The stent cleaning refers to the procedures of ultrasonic cleaning, drying and the like of the stent 6 by adopting oil removal agent, deionized water and the like.
The getter spot welding means that the evaporable getter 7 or the non-evaporable getter is spot welded on the back surface of the bracket 6.
And fourthly, assembling the inner pipe and the outer pipe, wherein the assembling process mainly comprises the steps of installing the inner pipe and the outer pipe, positioning a support ring, positioning the inner pipe and the outer pipe and the like.
The inner tube and the outer tube are arranged, namely the inner tube 2 which is finished with film coating is arranged inside the cover glass tube 5, and the round head of the inner tube 2 is fixed on the cover glass tube 5 through the bracket 6.
The support ring positioning means that the support ring is installed at a position 10-40mm away from the ring seal. The inner tube 2 is fixed in the cover glass tube 5 by means of a support ring and a holder 6, and the inner tube 2 and the cover glass tube 5 are coaxial.
The positioning of the inner pipe and the outer pipe refers to moving the relative positions of the inner pipe and the outer pipe to ensure that the inner pipe 2 extends out of the pipe by 5-10mm relative to the cover glass pipe 5.
And fifthly, the working procedure C of processing the condensation section mainly comprises the main working procedures of cutting to length and fixing to length, pulling a round head, punching a round head, closing a tail pipe, necking the tail pipe, cleaning, drying, flaring and the like in sequence.
The cutting length sizing of the condensation section processing procedure C is mainly characterized in that the length of the blank condensation section 1 is cut to the designed length range according to the length of the procedure of the condensation section 1, and the fused end cut is flattened through high-temperature flame, so that the cut is ensured to be round.
The rounding head of the condensation section processing procedure C is mainly characterized in that one end of the inner tube 2 is heated and melted by flame according to the size of the round head of the condensation section 1, the round head of the condensation section 1 is pulled out by drawing equipment, and the round head rounding is carried out in a melting state.
The round head punching of the condensation section processing C procedure is realized by blowing high-pressure gas with a certain diameter to the center of the round head in a high-temperature melting state after the round head drawing procedure is completed, forming a round hole under the action of the high-pressure gas and forming a regular round head hole under the automatic rotation and gravity action of the condensation section 1.
And the tail pipe of the condensation section processing step C is formed by connecting the tail pipe into a round head hole of the condensation section 1 in a sealing manner under a high-temperature condition.
The tail pipe necking of the condensation section processing step C means that after the tail pipe closing step is completed, a tail pipe necking with the aperture of 3-5mm and the wall thickness smaller than 1mm is formed at the position where the tail pipe and the condensation section 1 are connected through stretching and the rotation of the condensation section 1, so that the tail pipe can be killed after the heat collecting pipe is exhausted.
The cleaning of the procedure C of processing the condensation section is mainly to carry out the treatments of oil removal, decontamination and the like on the inner surface of the condensation section 1 by using a cleaning agent, and then to clean the cleaning agent on the inner surface of the condensation section 1 by using deionized water.
And the drying of the condensation section processing C procedure is mainly to dry the deionized water on the surface of the cleaned condensation section 1 and remove water films and water molecules on the surface so as to be beneficial to vacuumizing before subsequent coating.
The flaring of the condensation section processing step C is that under the action of flame, the opening of the condensation section 1 is flared through a graphite plate, the diameter of the flaring is the same as that of the cover glass tube 5, and the thinning of the glass wall thickness of the fusion sealing transition section is realized through flaring.
Sixthly, the three-tube melt sealing E procedure mainly comprises the following steps: the method comprises the following steps of clamping an inner pipe and an outer pipe, preheating the inner pipe and the outer pipe, thinning the inner pipe and the outer pipe in a fusion sealing manner, clamping the condensing section, preheating the condensing section, butt-jointing the three pipes at the same speed, fusion sealing the three pipes at the same speed, thinning the condensing section in a fusion sealing manner, and high-low temperature segmented annealing at the fusion sealing section.
The inner pipe and outer pipe clamping means that the assembled inner pipe and outer pipe assemblies are automatically or manually installed on three-pipe butt fusion sealing equipment, and the inner pipe and outer pipe assemblies are positioned through pipe orifices.
The preheating of the inner pipe and the outer pipe refers to the simultaneous preheating of the pipe orifices of the inner pipe and the outer pipe through flame, and the inner pipe and the outer pipe gradually reach a molten state.
The inner tube and the outer tube are fused and sealed and thinned, namely, the tube openings of the inner tube and the outer tube in a fusion state are fused and sealed and connected through a graphite plate tool, gas is introduced through a tail tube of the cover glass tube 5, and the wall thickness of the glass at the ring sealing opening of the inner tube 2 and the cover glass tube 5 is thinned under the action of gas pressure.
The condensation section clamping means that the assembled condensation section 1 assembly is automatically or manually installed on three-pipe butt fusion sealing equipment, and the condensation section 1 assembly is positioned through a pipe orifice.
The preheating of the condensation section refers to that the pipe orifice of the condensation section 1 is simultaneously preheated by flame to gradually reach a molten state.
The three pipes are butt jointed at the same speed, so that the inner pipe assembly, the outer pipe assembly and the condensing section 1 assembly which are sealed by melting are rotated at the same speed under the action of flame, and the ring seal opening of the condensing section 1 is flared and is oppositely connected with the ring seal openings of the inner pipe assembly and the outer pipe assembly.
The three pipes are sealed at the same speed by fusing, namely the ring seal of the condensation section 1 and the ring seal of the inner pipe component and the ring seal of the outer pipe component are sealed together by fusing under the action of flame.
The three tubes are subjected to same-speed fusion sealing, namely, the inner tube 2 and the cover glass tube 5 which are connected together in a fusion sealing mode are axially stretched by 5-10mm opposite to the condensing section 1 in the fusion sealing state, so that the glass wall thicknesses of the inner tube 2, the condensing section 1 and the cover glass tube 5 at the ring sealing position are integrally thinned, and the step shape between the cover glass tube 5 and the condensing section 1 is changed into a gradual change structure inclined by 120-150 degrees.
The high-low temperature annealing of the melt seal section refers to the stress weakening from the ring seal to the position far away from the ring seal from high temperature to low temperature of the ring seal position which is easy to generate stress, so that the stress near the ring seal is eliminated through thinning and high-low temperature annealing.
And seventhly, vacuum exhaust refers to vacuum exhaust of the vacuum heat collecting pipe assembly after the sealing and annealing are finished, and the vacuum interlayer 4 of the heat collecting pipe reaches a set vacuum degree to finish tail pipe sealing of the cover glass pipe 5.
The working medium filling means that working medium filling equipment is adopted, a working medium cavity of the heat collecting tube is vacuumized, and then a quantitative liquid working medium is filled, so that the tail pipe of the condensation section 1 is sealed.
The getter 7 is evaporated, namely the getter 7 on the heat collecting pipe bracket 6 is evaporated at high temperature under the action of high-frequency equipment to form a barium film of the getter 7.
The inspection refers to the process of inspecting finished products which are subjected to the procedures and form the all-glass heat pipe vacuum solar heat collecting pipe according to relevant standard requirements, and packaging and warehousing qualified products.
The process flow effectively ensures that the stable gradual change type three-tube butt joint structure is realized at the ring sealing position of the all-glass heat tube vacuum solar heat collection tube, a small arc structure and a thin-wall structure are arranged in the three-tube butt joint structure, the problem that the step of the existing all-glass heat tube vacuum solar heat collection tube collides with a sealing ring during installation is effectively solved, the heat collection tube is easily inserted into a water tank, and an effective sealing structure of the sealing ring and a glass cover tube 5 is formed. The stable, efficient, highly reliable and high-yield production of the all-glass heat pipe vacuum solar heat collecting pipe with the gradual change type three-pipe butt joint structure, the built-in small arc structure and the thin-wall structure and the near-ring seal stress-free can be realized under the process flow. The performance of the heat collecting pipe can meet the installation and use requirements of the current market for changing solar photo-thermal coal into electricity. All have the obvious effect of improving the quality and the performance of the product.
Claims (10)
1. The utility model provides a three tub of butt joint structures of solar energy collection pipe, three tub of butt joint structures constitute its characterized in that by the relative butt fusion of inner tube, cover glass pipe and condensation segment:
the cover glass tube is connected with the condensing section at an oblique angle of 120-150 degrees;
the wall thickness of the joint of the inner pipe and the condensing section is reduced to 60% -90% of the wall thickness of other parts of the inner pipe and the condensing section.
2. The three-tube butting structure of solar heat collecting tubes according to claim 1, wherein: the total length of the wall thickness reduction areas of the inner pipe and the condensation section is not more than 10 mm.
3. The three-tube butting structure for solar heat collecting tubes according to claim 2, wherein: the total length is 5-10 mm.
4. The three-tube butting structure of solar heat collecting tubes according to claim 1, wherein: the wall thickness of the inclined part of the cover glass tube connected to the condensing section is reduced to 60% -90% of that of the other part.
5. The three-tube butting structure of solar heat collecting tubes according to claim 1, wherein: and a fillet transition structure is formed at the joint of the cover glass tube and the inner tube.
6. A three-tube butt joint method of a solar heat collecting tube is characterized in that a ring seal of a condensation section and a ring seal of an inner tube assembly and an outer tube assembly are sealed together in a melting mode under the action of flame, the inner tube assembly and the outer tube assembly are an inner tube and a cover glass tube which are clamped and positioned together, and the three-tube butt joint method is characterized in that:
and under the state of melt sealing, the inner tube and the cover glass tube which are connected together by melt sealing are axially stretched opposite to the condensing section, so that the glass wall thicknesses of the inner tube, the condensing section and the cover glass tube at the position of the ring sealing opening are integrally thinned, and the step shape between the cover glass tube and the condensing section is changed into a gradual change structure inclined by 120-150 degrees.
7. The three-tube butting method for solar heat collecting tubes according to claim 6, wherein the three-tube butting method comprises the following steps: before the three pipes are butted, the condensing section is flared, and the thickness of the glass wall of the fusion sealing transition section is reduced through flaring.
8. The three-tube butting method for solar heat collecting tubes according to claim 6, wherein the three-tube butting method comprises the following steps: before the three pipes are butted, the inner pipe assembly and the outer pipe assembly are subjected to fusion sealing and thinning, namely, the pipe orifice of the inner pipe in a fusion state and the pipe orifice of the cover glass pipe are connected in a fusion sealing manner, and the thickness of the glass wall of the inner pipe and the cover glass pipe at the ring sealing port is thinned under the action of gas pressure by introducing gas into the cover glass pipe.
9. The three-tube butting method for solar heat collecting tubes according to claim 6, wherein the three-tube butting method comprises the following steps: the inner tube and the cover glass tube which are connected together in a sealing mode are opposite to the axial stretching length of the condensation section and are 5-10mm in length.
10. The three-tube butting method for solar heat collecting tubes according to any one of claims 6 to 9, wherein: the glass wall thickness of the inner tube, the condensing section and the cover glass tube at the position of the ring seal is reduced to 60% -90% of the wall thickness of other parts.
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