CN111964279A - Vacuum tube structure of solar heat collector - Google Patents
Vacuum tube structure of solar heat collector Download PDFInfo
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- CN111964279A CN111964279A CN202010884047.4A CN202010884047A CN111964279A CN 111964279 A CN111964279 A CN 111964279A CN 202010884047 A CN202010884047 A CN 202010884047A CN 111964279 A CN111964279 A CN 111964279A
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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
- F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
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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
- F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
- F24S40/80—Accommodating differential expansion of solar collector elements
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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
- F24S70/225—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption for spectrally selective absorption
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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
- F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
- F24S2010/751—Special fins
- F24S2010/752—Special fins extending obliquely
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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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Dispersion Chemistry (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to a vacuum tube structure of a solar heat collector, which comprises a metal inner tube, a glass outer tube and a U-shaped tube arranged in the metal inner tube, wherein the open end of the metal inner tube is welded with the open end of the glass outer tube, a tube plug is embedded at the end of the metal inner tube in a sealing manner, two ends of the U-shaped tube penetrate through the tube plug, a vacuum cavity is formed between the metal inner tube and the glass outer tube, and an elastic clamping piece is arranged at the bottom of the U-shaped tube of the metal inner tube in; the outer surface of the metal inner tube is coated with a selective absorption coating, the outer wall and the inner wall of the metal inner tube are of a wavy structure consisting of protruding portions and groove portions which are arranged at intervals, the protruding portions of the inner wall of the metal inner tube are integrally connected with a plurality of fin rings which are distributed in parallel up and down, and the U-shaped tube penetrates through the fin rings. The invention has the following advantages: the structural strength and the bearing capacity of the metal inner pipe are improved, the high utilization rate and the heat conductivity of light energy are realized, and the stress change caused by expansion with heat and contraction with cold of the metal inner pipe is effectively buffered.
Description
The technical field is as follows:
the invention belongs to the field of solar heat collectors, and particularly relates to a vacuum tube structure of a solar heat collector.
Background art:
solar energy is a dispersive and intermittent energy source, and energy storage technology is needed to store sufficient solar energy in the daytime for use at night or in cloudy days to make full use of the solar energy. A solar collector is a device that absorbs solar radiation energy, and converts solar radiation into other forms of energy by absorbing solar radiation of a certain wavelength. The vacuum tube structure for the solar heat collector at present adopts double-layer glass tubes, one end opening end is a long cylindrical pipeline in a closed state, the closed end is placed downwards, the open end is connected with a header of the solar heat collector, an air interlayer between the double-layer glass tubes is subjected to vacuum treatment, heat loss caused by air flow is reduced, the vacuum tube structure of the solar heat collector with the structure has the advantages of less conduction and convection heat loss, however, the mature production technology has the following defects:
1. the glass inner tube is hard and brittle, the glass inner tube absorbs solar radiation and the temperature rises, the surface and the inside of the glass inner tube generate temperature difference, the surface temperature of the directly heated glass inner tube is high, the temperature of the indirectly heated glass inner tube is low, the outer wall of the heated glass inner tube is expanded in an attempt to expand towards the periphery, the inner part with lower temperature attempts to maintain the original shape to block the expansion of the outside, so that the effects of expansion and reverse expansion are generated in the glass inner tube, the effects of stretching and compression are also generated, the outer wall of the glass inner tube generates compressive stress, the inner wall generates tensile stress, and the smooth glass inner tube is easy to crack under the effect of internal and external stresses for a long time;
2. because the solar radiation angle changes greatly within a day, partial light is refracted and scattered, the condensation effect is poor, the solar energy utilization rate is low, the high utilization rate of the light energy cannot be realized, the flow in the glass inner tube cannot be fully contacted with the U-shaped tube, and the thermal conductivity is low.
3. The tip thermal stress of vacuum tube is more concentrated, the tradition sets up the elasticity fastener in the vacuum cavity, to playing certain buffering guard action behind the glass inner tube tip receiving the thermal energy, current elasticity fastener comprises a plurality of metal cards, a plurality of metal cards evenly distributed are at the outer wall of glass inner tube, and a side of metal card contacts with the inner wall of glass outer tube, another side of metal card contacts with the outer wall of glass inner tube, and contact each other is the point contact, area of contact is less, when the glass inner tube takes place the inflation by the thermal stress effect, metal card and glass inner tube, the pressure of contact position is great between the glass outer tube, the elasticity of spring card itself is progressively weakened, after using a period, the spring card breaks away from glass inner tube and glass outer tube, influence the thermal stress buffer protection of glass inner tube tip position.
The invention content is as follows:
the invention aims to overcome the defects and provide a vacuum tube structure of a solar heat collector, which improves the structural strength and the pressure bearing capacity of a metal inner tube, realizes high utilization rate and thermal conductivity of optical energy and effectively buffers the stress change caused by expansion caused by heat and contraction caused by cold of the metal inner tube.
The purpose of the invention is realized by the following technical scheme: a vacuum tube structure of a solar heat collector comprises a metal inner tube, a glass outer tube and a U-shaped tube arranged in the metal inner tube, wherein the open end of the metal inner tube is welded with the open end of the glass outer tube, a tube plug is embedded at the end of the metal inner tube in a sealing manner, two ends of the U-shaped tube penetrate through the tube plug and are correspondingly connected with the inlet end and the outlet end of the solar heat collector, a vacuum cavity is formed between the metal inner tube and the glass outer tube, and an elastic clamping piece is arranged at the bottom of the U-shaped tube of the; the outer surface of the metal inner tube is coated with a selective absorption coating, the outer wall and the inner wall of the metal inner tube are of a wavy structure consisting of protruding portions and groove portions which are arranged at intervals, the protruding portions of the inner wall of the metal inner tube are integrally connected with a plurality of fin rings which are distributed in parallel up and down, and the U-shaped tube penetrates through the fin rings.
The invention is further improved in that: the outer wall of the bottom of the metal inner pipe is a smooth surface, and the inner wall of the bottom of the metal inner pipe is a wavy surface.
The invention is further improved in that: the elasticity fastener includes annular supporting seat and arranges a plurality of elastic metal pieces of outside extension on the annular supporting seat outer wall in, elastic metal piece is including the first circular arc section that sets gradually, first protruding section, the second circular arc section, the protruding section of second, the third circular arc section, first protruding section, the protruding section of second is the circular-arc structure that the opening dorsad metal inner tube set up, through second circular arc section smooth transition between first protruding section and the protruding section of second, through third circular arc section smooth transition between protruding section of second and the annular supporting seat, the protruding section of second of elasticity fastener contacts with two bellying adjacent with the metal inner tube outer wall under natural state, the first circular arc section of elasticity fastener contacts with the inner wall of glass outer tube under natural state.
The invention is further improved in that: the integrative direction circular arc piece that is equipped with of inward flange of annular supporting seat, direction circular arc piece and the bottom of metal inner tube cooperate, and the lower extreme of annular supporting seat is equipped with the connection piece that a plurality of equal circumference distribute, and a plurality of connection pieces are gathered together and are extended to the inner wall bottom an organic whole of glass outer tube towards the center of annular supporting seat has the spring, the one end and the glass outer tube butt fusion of spring.
The invention is further improved in that: the connecting pieces comprise inclined parts connected with the annular supporting seat and horizontal parts arranged at the lower ends of the inclined parts, and the horizontal parts of the connecting pieces are stacked up and down and fixed at the central axis of the annular supporting seat.
The invention is further improved in that: the elastic metal sheet gradually expands and extends from the bottom of the metal inner tube to the end part.
The invention is further improved in that: the opening of the first arc segment is arranged towards the metal inner pipe.
The invention is further improved in that: the finned ring is obliquely arranged in the metal inner tube, and the finned ring is horizontally arranged after the glass outer tube is obliquely arranged.
The invention is further improved in that: the metal inner pipe is internally provided with fluid which is water.
The invention is further improved in that: the vacuum cavity is formed by sealing a glass outer tube and a metal inner tube and then vacuumizing.
Compared with the prior art, the invention has the following advantages:
1. the vacuum tube adopts a structural form of combining the metal inner tube and the glass outer tube, and meanwhile, the outer wall and the inner wall of the metal inner tube are of a wavy structure consisting of the convex parts and the groove parts which are arranged at intervals, the wavy structure on the outer wall can effectively utilize refraction and scattering of different solar rays, so that the utilization rate of light energy is improved, meanwhile, the wavy structure can improve the structural strength of the metal inner tube, and the compressive stress of the outer wall and the tensile stress of the inner wall are effectively avoided; secondly, the wavy structure of the inner wall of the metal inner tube improves the full contact area between the temperature of the inner wall of the metal inner tube and the fluid in the metal inner tube, the heating is uniform, the thermal conductivity is improved, the fin ring in the metal inner tube not only improves the structural strength of the metal inner tube and avoids the deformation and even cracking of the metal inner tube caused by the concentration of internal thermal stress caused by the difference of the internal temperature and the external temperature, but also has the function of enhancing heat transfer, so that the fluid in the metal inner tube has the same temperature and high thermal conductivity.
2. The elastic clamping piece adopts an integrated structure, so that the elastic clamping piece is prevented from loosening in a vacuum cavity after losing part of elasticity due to expansion of the end part of the metal inner tube for a long time, the elastic clamping piece is prevented from being separated from the bottom of the vacuum cavity, the second protruding section of the elastic metal sheet is contacted with two adjacent protruding parts of the metal inner tube, two contact points are positioned on two sides of the central axis of the second protruding section, the pressure on the elastic metal sheet is small when the metal inner tube expands, and the elastic metal sheet is prevented from deforming and damaging, so that the normal use of the vacuum tube is influenced; the elasticity fastener is formed by two protruding sections and three arc sections which are arranged at intervals in sequence, so that the elasticity of the elasticity fastener is ensured, and the buffering effect is improved.
3. The direction circular arc piece plays certain support effect to the tip of metal inner tube, the direction circular arc piece can buffer outward when the pipe end expansion in the metal simultaneously, the setting of spring plays the effect of being connected elasticity fastener and glass outer tube inner wall, elasticity fastener is not hard up or even breaks away from in the vacuum cavity after avoiding the metal inner tube shrinkage, the buffer power of elasticity fastener has further been improved in the setting of spring simultaneously, when the metal inner tube tip receives heat card shrinkage, its high position in the vacuum cavity can in good time be adjusted to the elasticity fastener.
Description of the drawings:
fig. 1 is a schematic structural diagram of a vacuum tube structure of a solar heat collector according to the present invention.
Fig. 2 is a schematic structural diagram of an elastic clip of a vacuum tube structure of a solar heat collector according to the present invention.
Reference numbers in the figures:
1-elastic clamping piece, 2-glass outer tube, 3-U-shaped tube, 4-tube plug, 5-vacuum cavity, 6-metal inner tube and 7-fin ring;
11-annular supporting seat, 12-elastic metal sheet, 13-guiding arc sheet, 14-connecting sheet and 15-spring;
121-a first arc segment, 122-a first convex segment, 123-a second arc segment, 124-a second convex segment, 125-a third arc segment;
141-inclined part, 142-horizontal part;
61-convex part, 62-concave part, 63-smooth surface and 64-wavy surface.
The specific implementation mode is as follows:
for the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship, such as one based on the drawings, are used only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the structure or unit indicated must have a specific orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise specified and limited, terms such as "connected," "provided," "having," and the like are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, or directly connected, and may be connected through an intermediate medium, so that those skilled in the art can understand the basic meaning of the above terms in the present invention according to specific situations.
Fig. 1 shows an embodiment of a vacuum tube structure of a solar collector according to the present invention, which includes a metal inner tube 6, a glass outer tube 2, and a U-shaped tube 3 disposed in the metal inner tube 6, wherein an open end of the metal inner tube 6 is welded to an open end of the glass outer tube 2, a tube plug 4 is embedded at the end of the metal inner tube 6 in a sealing manner, two ends of the U-shaped tube 3 penetrate through the tube plug 4 and are correspondingly connected to an inlet end and an outlet end of the solar collector, a vacuum chamber 5 is disposed between the metal inner tube 6 and the glass outer tube 2, and an elastic clamping member 1 is disposed at the bottom of the U-shaped tube of the metal inner tube; the outer surface of the metal inner tube 6 is coated with a selective absorption coating, the outer wall and the inner wall of the metal inner tube 6 are both of a wavy structure consisting of protruding portions 61 and groove portions 62 which are arranged at intervals, the protruding portions 61 on the inner wall of the metal inner tube 6 are integrally connected with a plurality of fin rings 7 which are distributed in parallel up and down, and the U-shaped tube 3 penetrates through the fin rings 7.
The vacuum tube adopts a structural form that the metal inner tube 6 and the glass outer tube 2 are combined, meanwhile, the outer wall and the inner wall of the metal inner tube 6 are both of a wavy structure consisting of the convex parts 61 and the groove parts 62 which are arranged at intervals, the wavy structure on the outer wall can effectively utilize refraction and scattering of different solar rays, the light energy utilization rate is improved, meanwhile, the wavy structure can improve the structural strength of the metal inner tube 6, and the outer wall compressive stress and the inner wall tensile stress are effectively avoided; secondly, the wavy structure of the inner wall of the metal inner tube 6 improves the full contact area between the temperature of the inner wall of the metal inner tube and the fluid in the metal inner tube 6, the heating is uniform, the thermal conductivity is improved, the fin ring 7 in the metal inner tube 6 not only improves the structural strength of the metal inner tube 6, and avoids the deformation and even cracking of the metal inner tube 6 caused by the internal thermal stress concentration caused by the difference between the internal temperature and the external temperature, but also the fin ring 7 has the function of heat transfer enhancement, so that the fluid in the metal inner tube 6 has the same temperature and high thermal conductivity.
In the present application, if the wavy structure is provided only on the inner and outer walls of the end portion of the metal inner tube 6, the temperature at the middle position and the end position of the metal inner tube 6 cannot be uniform, and if the wavy structure is provided only on the inner wall of the metal inner tube 6 or only on the outer wall of the metal inner tube 6, the compressive stress generated on the outer wall of the glass inner tube and the tensile stress generated on the inner wall cannot be avoided.
Further, the outer wall of the bottom of the metal inner tube 6 is a smooth surface 63, and the inner wall of the bottom of the metal inner tube 6 is a wavy surface 64.
The smooth surface 63 of the outer wall is convenient to realize connection with the elastic clamping piece 1, and the wavy surface 64 of the inner wall ensures that fluid in the metal inner tube 6 is fully contacted with the inner wall and is heated uniformly.
Further, as shown in fig. 2, the elastic clip element 1 includes an annular supporting seat 11 and a plurality of elastic metal pieces 12 arranged on the outer wall of the annular supporting seat 11 and extending outwards, each elastic metal piece 12 includes a first arc segment 121, a first protruding segment 122, a second arc segment 123, a second protruding segment 124, and a third arc segment 125, which are sequentially arranged, each first protruding segment 122 and each second protruding segment 124 are arc-shaped structures with openings facing away from the inner metal tube 6, each first protruding segment 122 and each second protruding segment 124 are in smooth transition through the second arc segment 123, each second protruding segment 124 and the annular supporting seat 11 are in smooth transition through the third arc segment 125, each second protruding segment 124 of the elastic clip element 1 is in contact with two adjacent protruding portions 61 on the outer wall of the inner metal tube 6 in a natural state, and each first arc segment 121 of the elastic clip element 1 is in contact with the inner wall of the outer glass tube 2 in a natural state.
In this application, the one end of U type pipe 3 communicates the end of intaking of solar collector's header, and the other end communicates the play water end of solar collector's header, and the water in making the header through U type pipe 3 through the pump constantly circulates, and the water in U type pipe 3 receives the heat transfer of 6 inside temperatures in the metal inner tube and carries out the thermal-arrest.
The vacuum chamber 5 of the vacuum tube structure generally further comprises a getter and a getter film, which have a certain effect of maintaining the vacuum degree in the vacuum tube in order to absorb gas generated during the operation of the vacuum tube after evaporation, and the getter film are common knowledge known to those skilled in the art, so that they are not described in detail in the present application and illustrated in the attached drawings.
The elastic clamping piece 1 adopts an integrated structure, so that the phenomenon that the elastic clamping piece 1 loosens in the vacuum cavity 5 after losing part of elastic force due to the expansion of the end part of the metal inner tube 6 for a long time is avoided, the elastic clamping piece 1 is prevented from being separated from the bottom of the vacuum cavity 5, the second bulge section 124 of the elastic metal sheet 12 is contacted with the two adjacent bulge parts 61 of the metal inner tube 6, the two contact points are positioned at two sides of the central axis of the second bulge section 124, the pressure on the elastic metal sheet 12 is small when the metal inner tube 6 expands, and the deformation and damage of the elastic metal sheet 12 are avoided, so that the normal use of; the elastic clamping piece 1 is composed of two convex sections and three arc sections which are sequentially arranged at intervals, so that the elasticity of the elastic clamping piece is ensured, and the buffering effect is improved.
Furthermore, the inner edge of the annular supporting seat 11 is integrally provided with a guiding arc piece 13, the guiding arc piece 13 is matched with the bottom of the metal inner tube 6, the lower end of the annular supporting seat 11 is provided with a plurality of connecting pieces 14 which are distributed in an equal circumference manner, the connecting pieces 14 are gathered towards the center of the annular supporting seat 11 and integrally extend towards the bottom of the inner wall of the glass outer tube 2 to form a spring 15, and one end of the spring 15 is welded with the glass outer tube 2.
The guide circular arc piece 13 plays a certain supporting role for the end part of the metal inner tube 6, the guide circular arc piece 13 can be outwards diffused to buffer when the end part of the metal inner tube 6 expands, the spring 15 is arranged to play a role in connecting the elastic clamping piece 1 with the inner wall of the glass outer tube 2, the elastic clamping piece 1 is prevented from loosening or even separating from the vacuum cavity 5 after the metal inner tube 6 contracts, meanwhile, the arrangement of the spring 15 further improves the buffering force of the elastic clamping piece 1, and when the end part of the metal inner tube 6 is contracted by heat syndrome, the elastic clamping piece 1 can timely adjust the height position of the elastic clamping piece in the vacuum cavity 5.
Further, the connecting piece 14 includes an inclined portion 141 connected to the annular support base 11 and a horizontal portion 142 disposed at a lower end of the inclined portion 141, and the horizontal portions 142 of the plurality of connecting pieces 14 are stacked and fixed up and down at a central axis of the annular support base 11 to secure the spring 15 at a central line position of the annular support base 11.
Further, the elastic metal sheet 12 gradually expands and extends from the bottom of the metal inner tube 6 toward the end, and supports the inner wall of the glass outer tube 2 and the inner wall of the metal inner tube 6, thereby stabilizing the end of the metal inner tube 6.
Further, the opening of the first arc segment 121 is disposed toward the metal inner pipe 6.
Furthermore, the fin ring 7 is obliquely installed in the metal inner tube 6, and after the glass outer tube 2 is obliquely installed, the fin ring 7 is horizontally arranged.
During installation, a plurality of vacuum tubes of the solar heat collector are obliquely arranged between a header and a bracket of the solar heat collector, and the fin ring 7 is kept horizontal after installation, so that the area of full contact with fluid in the metal inner tube is increased; the plurality of fin rings 7 divide the interior of the metal inner tube 6 into a plurality of heat collection chambers, and fluid in each heat collection chamber is subjected to heat collection by the side wall of the metal inner tube 6 and the end faces of the fin rings 7, so that the heat collection efficiency is ensured.
Furthermore, the metal inner tube 6 has a fluid inside, and the fluid is water.
Furthermore, the vacuum cavity 5 is formed by sealing the glass outer tube 2 and the metal inner tube 6 and then vacuumizing.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a solar collector vacuum tube structure which characterized in that: the solar heat collector comprises a metal inner pipe (6), a glass outer pipe (2) and a U-shaped pipe (3) arranged in the metal inner pipe (6), wherein the open end of the metal inner pipe (6) is welded with the open end of the glass outer pipe (2), the end of the metal inner pipe (6) is embedded with a pipe plug (4) in a sealing manner, two ends of the U-shaped pipe (3) penetrate through the pipe plug (4) and are correspondingly connected with the inlet end and the outlet end of the solar heat collector, a vacuum cavity (5) is arranged between the metal inner pipe (6) and the glass outer pipe (2), and an elastic clamping piece (1) is arranged at the U-shaped bottom of the metal inner pipe (6) in the vacuum cavity (; the outer surface of the metal inner tube (6) is coated with a selective absorption coating, the outer wall and the inner wall of the metal inner tube (6) are of a wavy structure formed by protruding portions (61) and groove portions (62) which are arranged at intervals, a plurality of fin rings (7) which are distributed in parallel up and down are integrally connected to the protruding portions (61) of the inner wall of the metal inner tube (6), and the U-shaped tube (3) penetrates through the fin rings (7).
2. The solar collector vacuum tube structure as claimed in claim 1, wherein: the outer wall of the bottom of the metal inner pipe (6) is a smooth surface (63), and the inner wall of the bottom of the metal inner pipe (6) is a wavy surface (64).
3. The solar collector vacuum tube structure as claimed in claim 2, wherein: the elastic clamping piece (1) comprises an annular supporting seat (11) and a plurality of elastic metal sheets (12) which are arranged on the outer wall of the annular supporting seat (11) and extend outwards, each elastic metal sheet (12) comprises a first arc section (121), a first protruding section (122), a second arc section (123), a second protruding section (124) and a third arc section (125) which are sequentially arranged, each first protruding section (122) and each second protruding section (124) are of circular-arc structures with openings back to the metal inner tube (6), each first protruding section (122) and each second protruding section (124) are in smooth transition through the corresponding second arc section (123), each second protruding section (124) and the annular supporting seat (11) are in smooth transition through the corresponding third arc section (125), and the second protruding section (124) of the elastic clamping piece (1) is in contact with two adjacent protruding portions (61) on the outer wall of the metal inner tube (6) in a natural state, the first arc section (121) of the elastic clamping piece (1) is in contact with the inner wall of the glass outer tube (2) in a natural state.
4. A solar collector vacuum tube structure according to claim 3, wherein: the inward flange an organic whole of annular supporting seat (11) is equipped with direction circular arc piece (13), direction circular arc piece (13) cooperate with the bottom of metal inner tube (6), the lower extreme of annular supporting seat (11) is equipped with connection piece (14) that a plurality of circumferences distribute such as a plurality of, a plurality of connection pieces (14) are gathered together and are extended spring (15) to the inner wall bottom an organic whole of glass outer tube (2) towards the center of annular supporting seat (11), the one end and the glass outer tube (2) butt fusion of spring (15).
5. The solar collector vacuum tube structure as claimed in claim 4, wherein: the connecting piece (14) comprises an inclined part (141) connected with the annular supporting seat (11) and a horizontal part (142) arranged at the lower end of the inclined part (141), and the horizontal parts (142) of the connecting pieces (14) are vertically stacked and fixed at the central axis of the annular supporting seat (11).
6. The solar collector vacuum tube structure as claimed in claim 5, wherein: the elastic metal sheet (12) gradually expands and extends from the bottom of the metal inner tube (6) to the end part.
7. The solar collector vacuum tube structure as claimed in claim 6, wherein: the opening of the first arc section (121) is arranged towards the metal inner pipe (6).
8. The solar collector vacuum tube structure as claimed in claim 1, wherein: the fin rings (7) are obliquely arranged in the metal inner pipe (6), and the fin rings (7) are horizontally arranged after the glass outer pipe (2) is obliquely arranged.
9. The solar collector vacuum tube structure as claimed in claim 1, wherein: the metal inner pipe (6) is internally provided with fluid, and the fluid is water.
10. The solar collector vacuum tube structure as claimed in claim 1, wherein: the vacuum cavity (5) is formed by sealing a glass outer tube (2) and a metal inner tube (6) and then vacuumizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010884047.4A CN111964279B (en) | 2020-08-28 | 2020-08-28 | Vacuum tube structure of solar heat collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010884047.4A CN111964279B (en) | 2020-08-28 | 2020-08-28 | Vacuum tube structure of solar heat collector |
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| Publication Number | Publication Date |
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| CN111964279A true CN111964279A (en) | 2020-11-20 |
| CN111964279B CN111964279B (en) | 2021-12-28 |
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| CN202010884047.4A Active CN111964279B (en) | 2020-08-28 | 2020-08-28 | Vacuum tube structure of solar heat collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310221A (en) * | 2021-06-03 | 2021-08-27 | 日照中科美阳太阳能制造有限公司 | Tubular solar energy with vacuum tube explosion-proof function |
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