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WO2016017384A1 - Solar heat collecting tube - Google Patents

Solar heat collecting tube Download PDF

Info

Publication number
WO2016017384A1
WO2016017384A1 PCT/JP2015/069644 JP2015069644W WO2016017384A1 WO 2016017384 A1 WO2016017384 A1 WO 2016017384A1 JP 2015069644 W JP2015069644 W JP 2015069644W WO 2016017384 A1 WO2016017384 A1 WO 2016017384A1
Authority
WO
WIPO (PCT)
Prior art keywords
joint
tube
bellows
solar heat
heat collecting
Prior art date
Application number
PCT/JP2015/069644
Other languages
French (fr)
Japanese (ja)
Inventor
林　裕人
Original Assignee
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2016017384A1 publication Critical patent/WO2016017384A1/en

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a solar heat collecting tube, and more particularly to a solar heat collecting tube used in a trough type solar heat collecting device.
  • a trough-type solar heat collecting apparatus that condenses solar heat on a solar heat collecting tube using a condensing means having a parabolic surface and heats a heat medium flowing through the inner tube of the solar heat collecting tube.
  • the solar heat collecting tube used in this solar heat collecting apparatus has a double tube structure consisting of an inner tube and an outer tube in order to efficiently convert sunlight into heat and reduce heat loss. It is insulated by making a vacuum state between.
  • the solar heat collecting tube 111 includes an inner tube 112 that is a metal tube made of stainless steel (SUS) through which a heat medium can circulate, and an outer tube 114 that is a glass tube.
  • a vacuum space 113 is formed between the outer tube 114 and the outer tube 114.
  • a thermal expansion difference absorbing means 120 is provided between the inner tube 112 and the outer tube 114.
  • SUS bellows 115 and 116 are arranged in series and radially in a state of being overlapped via a SUS connecting tube 117.
  • the bellows 116 is connected to the inner tube 112 through a flange 118 made of SUS.
  • the bellows 115 is connected to the outer tube 114 via the Kovar metal ring 119.
  • the bellows 115 and 116 are manufactured with the shortest dimension in which the adjacent mountain fold portions and the valley fold portions are in close contact with each other.
  • the heat medium flowing through the inner tube 112 reaches about 400 ° C., so that a difference in thermal expansion occurs between the inner tube 112 and the outer tube 114. .
  • the bellows 115 and 116 are in an extended state.
  • the condensing range (active area) of the solar heat collecting tube 111 is the bellows 115 or bellows 116 for absorbing the shortest dimension of the bellows 115 or bellows 116 which is a dead space and the thermal expansion difference from the total length of the inner tube 112. It is the length obtained by subtracting the total amount of elongation. Since the amount of elongation of the bellows 115 or bellows 116 is determined by the material, it is necessary to shorten the shortest dimension of the bellows 115 or bellows 116 in order to increase the active area without changing the material and increase the heat collecting efficiency of the solar heat collecting tube 111. There is.
  • the solar heat collecting tube 111 described in Patent Document 1 is arranged such that the bellows 115 and 116 are arranged in series and in the radial direction via the connecting cylinder 117, and the bellows 115 and 116 are earned by the bellows.
  • this method since a plurality of bellows are provided, there is a problem that the cost increases.
  • the present invention has been made to solve such a problem, and an object thereof is to provide a solar heat collecting tube having an enlarged active area.
  • the solar heat collecting tube according to the present invention is installed on the surface of the inner tube near the end of the outer tube, the inner tube, and the inner tube, and a plurality of mountain fold shape portions and valley fold shape portions are alternately arranged.
  • the outer tube and the inner tube are connected via the thermal expansion difference absorption means, and at least two of the plurality of mountain fold shape portions and valley fold shape portions are adjacent to each other.
  • the diameters of the mountain fold shape portions and the valley fold shape portions are different.
  • the diameters of at least two adjacent mountain fold shape portions or valley fold shape portions of the plurality of mountain fold shape portions and valley fold shape portions of the thermal expansion difference absorbing means are different. Since the shortest dimension of the thermal expansion difference absorbing means is shortened, the active area can be enlarged.
  • Embodiment 1 of this invention It is a partial exploded view of one end part vicinity of the solar heat collecting tube which concerns on Embodiment 1 of this invention. It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 1 of the present invention. It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 1 of the present invention. It is a partial exploded view of one end part vicinity of the solar heat collecting tube which concerns on Embodiment 2 of this invention. It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 2 of the present invention. It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 2 of the present invention. It is a fragmentary sectional view near one end of a conventional solar heat collecting tube.
  • the solar heat collecting tube 1 has a double tube structure including a glass tube 2 as an outer tube and a heat medium flow tube 3 as an inner tube. Further, the solar heat collecting tube 1 includes a bellows 4 (only one bellows 4 is shown in FIG. 1) and a bellows 4 which are annular thermal expansion difference absorbing means disposed at both ends of the glass tube 2.
  • An annular joint 5 provided between the glass tube 2 and a Kovar metal which is a joint attachment portion for attaching the joint 5 to the glass tube 2 and is a cylindrical member provided concentrically with the glass tube 2 A ring 6 is provided.
  • the material of the glass tube 2 is not particularly limited, and transparent heat-resistant glass can be generally used.
  • Examples of the transparent heat-resistant glass glass tube include a borosilicate glass tube.
  • the material of the heat medium flow pipe 3 is not particularly limited, and generally, a heat-resistant metal such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like can be used. .
  • a heat-resistant metal such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like can be used.
  • SUS heat-based material
  • alloy steel for example, alloy steel, carbon steel
  • aluminum-based material aluminum-based material
  • the glass tube 2 and the heat medium flow tube 3 share the central axis X.
  • One end of a bellows 4 is connected to the outer peripheral surface of the heat medium flow pipe 3 in the vicinity of one end 3a of the heat medium flow pipe 3.
  • the other end of the bellows 4 is connected to the joint 5.
  • the joint 5 is connected to one end of the Kovar metal ring 6, and the other end of the Kovar metal ring 6 is connected to the end of the glass tube 2.
  • a connection portion between the Kovar metal ring 6 and the glass tube 2 is referred to as a glass metal joint portion 7.
  • the bellows 4, the joint 5, and the Kovar metal ring 6 share the central axis X.
  • the bellows 4, the joint 5, and the Kovar metal ring 6 form an annular sealed space between the glass tube 2 and the heat medium flow tube 3, and the vacuum space 8 is formed by bringing the sealed space into a vacuum state. Forming.
  • the bellows 4 alternately includes a mountain fold-shaped portion 4 a in which a fold is formed toward the radially outer side of the bellows 4 and a valley fold-shaped portion 4 b in which a fold is formed toward the radially inner side of the bellows 4.
  • Each has a plurality.
  • the diameter of each of the plurality of mountain fold-shaped portions 4 a decreases in a tapered shape toward the end portion 3 a of the heat medium flow pipe 3.
  • the diameter of each of the plurality of valley-folded portions 4b also decreases in a tapered shape toward the end portion 3a of the heat medium flow pipe 3.
  • each mountain fold shape part 4a is a position shifted in the radial direction of the bellows 4 with respect to the adjacent mountain fold shape part 4a, and is generally an adjacent mountain fold shape part 4a and an adjacent valley fold shape part 4b. It is formed so as to be located at an intermediate position (intermediate portion).
  • each valley fold shape part 4b is a position shifted in the radial direction of the bellows 4 with respect to the adjacent valley fold shape part 4b, and is intermediate between the adjacent mountain fold shape part 4a and the adjacent valley fold shape part 4b. It is formed so as to be located in the part.
  • the material of the bellows 4 is not particularly limited, and for example, a metal having heat resistance such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material can be used. Further, another member may be used for a part of the bellows 4.
  • the connection method of the bellows 4, the heat medium distribution pipe 3, and the joint 5 is not specifically limited, For example, well-known joining methods, such as welding, soldering, and brazing, can be used.
  • the joint 5 includes a joint vertical surface portion 5a that is a joint ring-shaped portion, a joint cylindrical portion 5b, a joint innermost portion 5c, and a joint outermost portion 5d.
  • the joint vertical surface portion 5 a is an annular plate-shaped member that is provided concentrically with the heat medium flow pipe 3 and is perpendicular to the central axis X, and is connected to the bellows 4.
  • the joint cylindrical portion 5b is a cylindrical member concentric with the heat medium flow pipe 3, and is provided so as to surround the bellows 4 in the vicinity of the glass metal joint portion 7, and is connected to the joint vertical surface portion 5a. Yes.
  • the joint innermost part 5c is provided so as to be connected to the inner peripheral edge of the joint vertical surface part 5a, and is a cylindrical member concentric with the heat medium flow pipe 3.
  • the joint outermost part 5d is an annular plate-like member that is provided concentrically with the heat medium flow pipe 3, and is perpendicular to the central axis X.
  • the joint outermost part 5d is connected to the end of the joint cylindrical part 5b and the Kovar metal ring 6. Each is connected.
  • the joint cylindrical portion 5b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction.
  • the joint 5 is provided so as to surround the bellows 4 as a whole.
  • the material of the joint 5 is not particularly limited, and for example, a metal having heat resistance that does not transmit light, such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like is used. Can do.
  • a metal having heat resistance that does not transmit light such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like is used. Can do.
  • the connection method of the joint 5 and the Kovar metal ring 6 is not specifically limited, For example, well-known joining methods, such as welding, soldering, and brazing, can be used.
  • the Kovar metal ring 6 is made of Kovar and has a linear expansion coefficient close to that of the glass tube 2.
  • the Kovar metal ring 6 is provided so as to surround the bellows 4 and the joint 5.
  • the Kovar metal ring 6 is connected such that its end is inserted into the end of the glass tube 2.
  • the region between the end 3a of the heat medium flow pipe 3 and the joint innermost part 5c indicated by the arrow A is an inactive area of the solar heat collecting pipe 1 because it does not contribute to the collection of sunlight.
  • the configuration described above is a configuration near one end of the solar heat collecting tube 1, but the configuration near the other end of the solar heat collecting tube 1 is the same.
  • the bellows 4 is in the most contracted state as shown in FIG.
  • the length in the central axis X direction of each mountain fold shape portion 4a, each valley fold shape portion 4b, and the intermediate portion of the bellows 4 is determined between each mountain fold shape portion 4a, each valley fold shape portion 4b, and the intermediate portion. If it calls the width about each, the width
  • each mountain fold shape part 4a is formed so that it may be located in the same height as an intermediate part with respect to the radial direction of the adjacent mountain fold shape part 4a and valley fold shape part 4b on the opposite side to the edge part 3a. Therefore, the adjacent mountain fold shaped portion 4a on the same side as the end portion 3a can be accommodated in the intermediate portion.
  • each valley fold shape part 4b is formed so that it may be located in the same height as an intermediate part with respect to the radial direction of the adjacent mountain fold shape part 4a and the valley fold shape part 4b on the same side as the edge part 3a. Therefore, the mountain fold shape portion 4a and the valley fold shape portion 4b opposite to the end portion 3a can be accommodated in the intermediate portion.
  • each mountain fold shape portion 4a and the valley fold shape portion 4b having a width larger than the width of the intermediate portion can be accommodated in each intermediate portion, the diameters of each mountain fold shape portion 4a and each valley fold shape portion 4b are uniform.
  • the shortest dimension of the bellows 4 is smaller than that of the case.
  • the heat medium flowing inside the heat medium flow tube 3 is heated by the heat of sunlight transmitted through the glass tube 2.
  • the glass tube 2 and the heat medium flow tube 3 are thermally expanded by the heat of the heat medium.
  • the difference in thermal expansion between the glass tube 2 and the heat medium flow tube 3 is caused. Occurs. Since the thermal expansion coefficient of the heat medium flow tube 3 is larger than that of the glass tube 2, the heat medium flow tube 3 protrudes in the direction of the end 3 a rather than the glass tube 2 as shown in FIG. 3.
  • the bellows 4 extends in the longitudinal direction of the heat medium flow tube 3 to absorb the difference in thermal expansion between the glass tube 2 and the heat medium flow tube 3.
  • the inactive area of the solar heat collecting tube 1 at this time is the area indicated by the arrow A which is the inactive area at the time of the shortest dimension of the bellows 4, and the bellows 4 extends due to absorption of the thermal expansion difference.
  • the area indicated by the arrow A ′ is obtained by adding the area indicated by the arrow B which is the minute area.
  • the area indicated by the arrow A is reduced, and as a result, the area indicated by the arrow A ′ that is an inactive area is also reduced.
  • the area of the inactive area can be enlarged and the heat collection efficiency of the solar heat collecting tube 1 can be increased.
  • the joint cylindrical portion 5b is disposed between the heat medium flow pipe 3 and the glass metal joint 7, and shields the radiant heat indicated by the arrow C from the heat medium flow pipe 3. Is prevented from reaching the glass-metal joint 7 directly. Further, since the joint cylindrical portion 5b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction, the joint vertical surface portion 5a is joined to the glass tube 2 of the Kovar metal ring 6 in the central axis X direction. It is located at the same position as the end on the other side or further on the side farther from the end 3a.
  • the joint vertical surface part 5a blocks the reflected light indicated by the arrow D from the heat medium flow pipe 3, the reflected light is prevented from reaching the glass metal joint 7 directly.
  • the joint cylindrical portion 5b is connected to the joint vertical surface portion 5a, and the joint outermost portion 5d is connected to the joint cylindrical portion 5b, whereby the Kovar metal ring 6 is connected to the joint cylindrical portion 5b.
  • the path through which the heat from the surface of the heat medium flow pipe 3 is transmitted to the glass metal joint 7 via the bellows 4, the joint 5, and the Kovar metal ring 6 is the joint cylindrical part 5b and the outermost part of the joint. Since only the portion 5d becomes longer, it becomes difficult for the heat from the heat medium flow pipe 3 to reach the glass metal joint portion 7. Therefore, it is possible to reduce the possibility that the glass-metal joint 7 is damaged by heat.
  • a member corresponding to the flange 118 (see FIG. 7) is not provided as compared with the invention described in Patent Document 1. Therefore, the number of parts is reduced as compared with the case where a member corresponding to the flange 118 is provided, and the number of parts connected to each other is reduced. If the connection between parts is damaged due to a failure or manufacturing problem, the vacuum space 8 is leaked, the vacuum degree of the vacuum space 8 is lowered, and the efficiency and function of the solar heat collecting tube 1 are reduced. Leads to failure. For this reason, it is desirable that the number of parts to be connected is small. Therefore, not providing a member corresponding to the flange 118 of the first embodiment is an advantage compared to the invention described in Patent Document 1.
  • the diameters of the plurality of mountain fold-shaped portions 4a and valley fold-shaped portions 4b of the bellows 4 decrease in a tapered shape toward the end portion 3a of the heat medium flow pipe 3, so that the shortest of the bellows 4 is achieved. Since a dimension becomes short, the active area of the solar heat collecting tube 1 can be expanded.
  • Embodiment 2 Next, a solar heat collecting tube according to Embodiment 2 of the present invention will be described.
  • the same reference numerals as those in FIGS. 1 to 3 are the same or similar components, and thus detailed description thereof is omitted.
  • the solar heat collecting tube according to the second embodiment of the present invention is obtained by changing the shape of the bellows with respect to the first embodiment.
  • the solar heat collecting tube 21 has a bellows 24 that is an annular thermal expansion difference absorbing means disposed at both ends of the glass tube 2 (only one bellows 24 is shown in FIG. 4). ), An annular flange 29, an annular joint 25 provided between the bellows 24 and the glass tube 2, and a Kovar metal ring 6.
  • the flange 29 includes a cylindrical outer peripheral refracting portion 29 a provided along the outer peripheral edge of the flange 29 and a cylindrical inner peripheral refracting portion 29 b provided along the inner peripheral edge of the flange 29. And.
  • the inner peripheral refracting portion 29 b is connected to the outer peripheral surface of the heat medium flow tube 3 in the vicinity of the end 3 a of the heat medium flow tube 3.
  • One end of the bellows 24 is connected to the outer peripheral refracting portion 29a. The other end of the bellows 24 is connected to the joint 25.
  • the bellows 24 alternately includes a mountain fold-shaped portion 24a in which a fold is formed toward the radially outer side of the bellows 24 and a valley fold-shaped portion 24b in which a fold is formed toward the radially inner side of the bellows 24.
  • Each has a plurality.
  • the diameter of each of the plurality of mountain fold-shaped portions 24 a increases in a tapered shape toward the end 3 a of the heat medium flow pipe 3.
  • the diameter of each of the plurality of valley-folded portions 24b also increases in a tapered shape toward the end portion 3a of the heat medium flow pipe 3.
  • each mountain fold shape part 24a is a position shifted in the radial direction of the bellows 24 with respect to the adjacent mountain fold shape part 24a, and is intermediate between the adjacent mountain fold shape part 24a and the adjacent valley fold shape part 24b. It is formed to be a part.
  • each valley fold shape portion 24b is a position shifted in the radial direction of the bellows 24 with respect to the adjacent valley fold shape portion 24b, and is intermediate between the adjacent mountain fold shape portion 24a and the adjacent valley fold shape portion 24b. It is formed to be a part.
  • the material of the bellows 24 is the same as that of the bellows 4 of the first embodiment.
  • the material of the flange 29 is not particularly limited, and for example, a heat-resistant metal such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like can be used.
  • a heat-resistant metal such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like can be used.
  • connection method of the flange 29 and the bellows 24 is not specifically limited, For example, well-known joining methods, such as welding, soldering, and brazing, can be used.
  • the joint 25 includes a joint vertical surface portion 25a which is a joint ring-shaped portion, a joint cylindrical portion 25b, a joint innermost portion 25c, a joint outermost portion 25d, and a joint escape portion 25e.
  • the joint vertical surface portion 25 a is an annular plate member that is provided concentrically with the heat medium flow pipe 3 and is perpendicular to the central axis X, and is connected to the bellows 24.
  • the joint cylindrical portion 25b has a cylindrical shape concentric with the heat medium flow pipe 3, is provided so as to surround the bellows 4 in the vicinity of the glass metal joint portion 7, and is connected to the joint vertical surface portion 25a.
  • the joint innermost portion 25c is provided so as to be connected to the inner peripheral edge of the joint vertical surface portion 25a, and is a cylindrical member concentric with the heat medium flow pipe 3.
  • the joint outermost part 25d is an annular member that is concentrically provided with the heat medium flow pipe 3 and is perpendicular to the central axis X.
  • the joint outermost part 25d is connected to the end of the joint cylindrical part 25b and the Kovar metal ring 6, respectively. Connected.
  • the joint cylindrical portion 25b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction.
  • the joint 25 is provided so as to surround the bellows 24 as a whole.
  • the joint escape portion 25e is a recess into which the mountain fold-shaped portion 24a closest to the joint vertical surface portion 25a enters when the bellows 24 contracts.
  • the joint cylindrical portion 25b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction.
  • the material of the joint 25 is the same as that of the joint 5.
  • the connection method between the joint 25 and the Kovar metal ring 6 is the same as the connection method between the joint 5 and the Kovar metal ring 6.
  • the bellows 24 is contracted to the shortest dimension as shown in FIG.
  • the width of the mountain fold shape portion 24a and the valley fold shape portion 24b is larger than the width of the intermediate portion, as in the first embodiment. Since the mountain fold shape portion 24a and the valley fold shape portion 24b having a width larger than the width of the intermediate portion can be accommodated at the position of the intermediate portion, each mountain fold shape portion 24a and each valley fold shape portion 24b The shortest dimension when the bellows 24 contracts is smaller than when the diameter is uniform.
  • the heat medium flow tube 3 is more end 3a than the glass tube 2 due to the difference in thermal expansion between the heat medium flow tube 3 and the glass tube 2 as shown in FIG. Protrudes depending on the direction.
  • the bellows 24 extends in the longitudinal direction of the heat medium flow tube 3 to absorb the difference in thermal expansion between the glass tube 2 and the heat medium flow tube 3.
  • the inactive area of the solar heat collecting tube 21 at this time is the area indicated by the arrow E, which is the inactive area when the bellows 24 is the shortest dimension, and the bellows 24 is extended to absorb the difference in thermal expansion.
  • a region indicated by an arrow E ′ is added to a region indicated by an arrow F which is a minute region.
  • the area indicated by the arrow E is reduced, and as a result, the area indicated by the arrow E ′ which is an inactive area is also reduced.
  • the area of the inactive area can be enlarged and the heat collection efficiency of the solar heat collecting tube 21 can be increased.
  • the joint cylindrical portion 25b prevents the radiant heat indicated by the arrow C from the heat medium flow pipe 3 from reaching the glass metal joint portion 7 directly.
  • the joint vertical surface portion 25a prevents the reflected light indicated by the arrow D from the heat medium flow pipe 3 from reaching the glass metal joint portion 7 directly.
  • the Kovar metal ring 6 is connected to the joint cylindrical portion 25b.
  • the path through which the heat from the surface of the heat medium flow pipe 3 is transmitted to the glass metal joint 7 via the bellows 24, the joint 25, and the Kovar metal ring 6 is the joint cylindrical part 25b and the joint outermost part 25d. Therefore, it becomes difficult for the heat from the heat medium flow pipe 3 to reach the glass metal joint 7. Therefore, it is possible to reduce the possibility that the glass-metal joint 7 is damaged by heat.
  • the diameters of the plurality of mountain fold-shaped portions 24 a and valley fold-shaped portions 24 b of the bellows 24 increase in a tapered shape toward the end portion 3 a of the heat medium flow pipe 3, so that the shortest of the bellows 24 is achieved. Since a dimension becomes short, the active area of the solar heat collecting tube 1 can be expanded.
  • the plurality of mountain fold-shaped portions 4a and valley fold-shaped portions 4b of the bellows 4 decrease in a tapered shape toward the end portion 3a of the heat medium flow pipe 3, and in the second embodiment, the bellows 24
  • the plurality of mountain fold-shaped portions 24a and valley fold-shaped portions 24b increase in a tapered shape toward the end 3a of the heat medium flow pipe 3, but are not limited to this configuration.
  • at least two adjacent mountain fold shape portions or valley fold shape portions may have different diameters.
  • a mountain fold-shaped portion or a valley fold-shaped portion provided at one end of the bellows and a mountain fold-shaped portion provided at the other end you may form so that the diameter of the mountain fold shape part and valley fold shape part provided between valley fold shape parts may become the largest.
  • the joint 5 includes a joint vertical surface portion 5a, a joint cylindrical portion 5b, a joint innermost portion 5c, and a joint outermost portion 5d.
  • the joint 25 is a joint
  • the vertical surface portion 25a, the joint cylindrical portion 25b, the joint innermost portion 25c, the joint outermost portion 25d, and the joint escape portion 25e are provided, the present invention is not limited to this configuration.
  • the joint cylindrical shape portion 5b and the joint outermost portion 5d may not be provided, and the Kovar metal ring 6 may be connected to the joint vertical surface portion 5a.
  • the joint 5 has only the joint vertical surface portion 5a and the joint innermost portion 5c.
  • the Kovar metal ring 6 may be connected to the joint vertical surface portion 25a without providing the joint cylindrical portion 25b and the joint outermost portion 25d.
  • the joint 25 includes only a joint vertical surface portion 25a, a joint innermost portion 25c, and a joint relief portion 25e.
  • the Kovar metal ring 6 is made of Kovar metal, but another material having a linear expansion coefficient close to that of the glass tube 2 may be used.
  • the joint vertical surface portion 5a and the joint outermost portion 5d are provided perpendicular to the central axis X
  • the joint vertical surface portion 25a and the joint outermost portion 25d are the central axis X
  • the present invention is not limited to this form.
  • the joint vertical surface part 5a and the joint outermost part 5d may be provided so as to intersect with the central axis X at an angle other than 90 degrees.
  • the joint vertical surface portion 25a and the joint outermost portion 25d may be provided so as to intersect with the central axis X at an angle other than 90 degrees.

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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)
  • Joints Allowing Movement (AREA)

Abstract

The diameter of each of a plurality of mountain fold-shaped sections (4a) of a bellows (4) decreases in a tapering manner with decreasing distance to an end portion (3a) of a heat carrier circulating tube (3). Likewise, the diameter of each of a plurality of valley fold-shaped sections (4b) decreases in a tapering manner with decreasing distance to the end portion (3a) of the heat carrier circulating tube (3). Specifically, each mountain fold-shaped section (4a) is formed so as to be positioned in a position that is offset in the radial direction of the bellows (4) from adjacent mountain fold-shaped sections (4a) and that is an approximately intermediate position (intermediate section) between the adjacent mountain fold-shaped sections (4a) and between adjacent valley fold-shaped sections (4b). Likewise, each valley fold-shaped section (4b) is formed so as to be positioned in a position that is offset in the radial direction of the bellows (4) from adjacent valley fold-shaped sections (4b) and that is an intermediate section between adjacent mountain fold-shaped sections (4a) and between the adjacent valley fold-shaped sections(4b).

Description

太陽熱集熱管Solar collector tube
　この発明は、太陽熱集熱管に係り、特に、トラフ式の太陽熱集熱装置に用いられる太陽熱集熱管に関する。 The present invention relates to a solar heat collecting tube, and more particularly to a solar heat collecting tube used in a trough type solar heat collecting device.
　放物面を有する集光手段を用いて太陽熱を太陽熱集熱管に集光し、太陽熱集熱管の内管の内部を流通する熱媒体を加熱するトラフ式の太陽熱集熱装置が知られている。この太陽熱集熱装置に用いられる太陽熱集熱管は、太陽光を効率良く熱に変換して熱損失を少なくするために、内管と外管とからなる二重管構造とし、内管と外管との間を真空状態にすることで断熱している。 2. Description of the Related Art A trough-type solar heat collecting apparatus is known that condenses solar heat on a solar heat collecting tube using a condensing means having a parabolic surface and heats a heat medium flowing through the inner tube of the solar heat collecting tube. The solar heat collecting tube used in this solar heat collecting apparatus has a double tube structure consisting of an inner tube and an outer tube in order to efficiently convert sunlight into heat and reduce heat loss. It is insulated by making a vacuum state between.
　このような従来の太陽熱集熱管が特許文献１に記載されている。図７に示すように、この太陽熱集熱管１１１は、熱媒体が流通可能なステンレス鋼（ＳＵＳ）製の金属管である内管１１２と、ガラス管である外管１１４とを備え、内管１１２と外管１１４との間に真空空間１１３が形成されている。内管１１２と外管１１４との太陽熱による熱膨張差を吸収するため、熱膨張差吸収手段１２０が内管１１２と外管１１４との間に設けられている。熱膨張差吸収手段１２０として、ＳＵＳ製のベローズ１１５，１１６がＳＵＳ製の接続筒１１７を介して直列に、且つ径方向に重なる状態で配置されている。ベローズ１１６はＳＵＳ製のフランジ１１８を介して内管１１２に接続されている。ベローズ１１５はコバール金属環１１９を介して外管１１４に接続されている。 Such a conventional solar heat collecting tube is described in Patent Document 1. As shown in FIG. 7, the solar heat collecting tube 111 includes an inner tube 112 that is a metal tube made of stainless steel (SUS) through which a heat medium can circulate, and an outer tube 114 that is a glass tube. A vacuum space 113 is formed between the outer tube 114 and the outer tube 114. In order to absorb the thermal expansion difference due to solar heat between the inner tube 112 and the outer tube 114, a thermal expansion difference absorbing means 120 is provided between the inner tube 112 and the outer tube 114. As the thermal expansion difference absorbing means 120, SUS bellows 115 and 116 are arranged in series and radially in a state of being overlapped via a SUS connecting tube 117. The bellows 116 is connected to the inner tube 112 through a flange 118 made of SUS. The bellows 115 is connected to the outer tube 114 via the Kovar metal ring 119.
　太陽熱集熱管１１１の製造時は、ベローズ１１５，１１６の隣り合う山折り形状部同士及び谷折り形状部同士が密着している最短寸法で製造される。太陽熱集熱管１１１を太陽熱集熱装置に設けて使用する場合は、内管１１２を流れる熱媒体が約４００℃に達するため、内管１１２と外管１１４との間に熱膨張差が生じてしまう。この熱膨張差を吸収するために、ベローズ１１５，１１６は伸びた状態になる。この時、太陽熱集熱管１１１の集光範囲（アクティブエリア）は、内管１１２の全長から、デッドスペースであるベローズ１１５又はベローズ１１６の最短寸法と熱膨張差を吸収するためのベローズ１１５又はベローズ１１６の伸び量との合計を引いた長さとなる。ベローズ１１５又はベローズ１１６の伸び量は材質によって決まるので、材質を変えずにアクティブエリアを拡大して太陽熱集熱管１１１の集熱効率を上げるためには、ベローズ１１５又はベローズ１１６の最短寸法を短くする必要がある。 When the solar heat collecting tube 111 is manufactured, the bellows 115 and 116 are manufactured with the shortest dimension in which the adjacent mountain fold portions and the valley fold portions are in close contact with each other. When the solar heat collecting tube 111 is used in a solar heat collecting device, the heat medium flowing through the inner tube 112 reaches about 400 ° C., so that a difference in thermal expansion occurs between the inner tube 112 and the outer tube 114. . In order to absorb this thermal expansion difference, the bellows 115 and 116 are in an extended state. At this time, the condensing range (active area) of the solar heat collecting tube 111 is the bellows 115 or bellows 116 for absorbing the shortest dimension of the bellows 115 or bellows 116 which is a dead space and the thermal expansion difference from the total length of the inner tube 112. It is the length obtained by subtracting the total amount of elongation. Since the amount of elongation of the bellows 115 or bellows 116 is determined by the material, it is necessary to shorten the shortest dimension of the bellows 115 or bellows 116 in order to increase the active area without changing the material and increase the heat collecting efficiency of the solar heat collecting tube 111. There is.
特開２０１４－３１９０９号公報JP 2014-31909 A
　しかしながら、特許文献１に記載された太陽熱集熱管１１１は、ベローズ１１５の各山折り形状部の直径がそれぞれ等しく、ベローズ１１５の各谷折り形状部の直径がそれぞれ等しい。同様に、ベローズ１１６の各山折り形状部の直径がそれぞれ等しく、ベローズ１１６の各谷折り形状部の直径がそれぞれ等しい。このため、ベローズ１１５，１１６は隣り合う山折り形状部同士及び隣り合う谷折り形状部同士が接触した状態よりも縮むことができないので、アクティブエリアをさらに拡大することができないという問題点があった。また、特許文献１に記載された太陽熱集熱管１１１は、ベローズ１１５，１１６が接続筒１１７を介して直列に、且つ径方向に重なる状態で配置されていてベローズの伸び量を稼いでいるが、この方法ではベローズを複数設けるため、コストが増大するという問題点もあった。 However, in the solar heat collecting tube 111 described in Patent Document 1, the diameter of each mountain fold shape portion of the bellows 115 is equal, and the diameter of each valley fold shape portion of the bellows 115 is equal. Similarly, the diameter of each mountain fold shape portion of the bellows 116 is equal, and the diameter of each valley fold shape portion of the bellows 116 is equal. For this reason, since the bellows 115 and 116 cannot shrink more than the state where the adjacent mountain fold-shaped portions and the adjacent valley fold-shaped portions contact each other, there is a problem that the active area cannot be further expanded. . In addition, the solar heat collecting tube 111 described in Patent Document 1 is arranged such that the bellows 115 and 116 are arranged in series and in the radial direction via the connecting cylinder 117, and the bellows 115 and 116 are earned by the bellows. In this method, since a plurality of bellows are provided, there is a problem that the cost increases.
　この発明はこのような問題を解決するためになされたものであり、アクティブエリアを拡大した太陽熱集熱管を提供することを目的とする。 The present invention has been made to solve such a problem, and an object thereof is to provide a solar heat collecting tube having an enlarged active area.
　この発明に係る太陽熱集熱管は、外管と、内管と、内管の端部付近の内管の表面に設置され、複数の山折り形状部及び谷折り形状部が交互に配置された伸縮可能な熱膨張差吸収手段とを備え、外管と内管とは熱膨張差吸収手段を介して接続され、複数の山折り形状部及び谷折り形状部のうち、少なくとも二つの隣り合っている山折り形状部同士及び谷折り形状部同士の直径が異なる。 The solar heat collecting tube according to the present invention is installed on the surface of the inner tube near the end of the outer tube, the inner tube, and the inner tube, and a plurality of mountain fold shape portions and valley fold shape portions are alternately arranged. The outer tube and the inner tube are connected via the thermal expansion difference absorption means, and at least two of the plurality of mountain fold shape portions and valley fold shape portions are adjacent to each other. The diameters of the mountain fold shape portions and the valley fold shape portions are different.
　この発明によれば、熱膨張差吸収手段の複数の山折り形状部及び谷折り形状部のうち、少なくとも２つの隣り合っている山折り形状部同士又は谷折り形状部同士の直径が異なることで、熱膨張差吸収手段の最短寸法が短くなるので、アクティブエリアを拡大することができる。 According to this invention, the diameters of at least two adjacent mountain fold shape portions or valley fold shape portions of the plurality of mountain fold shape portions and valley fold shape portions of the thermal expansion difference absorbing means are different. Since the shortest dimension of the thermal expansion difference absorbing means is shortened, the active area can be enlarged.
この発明の実施の形態１に係る太陽熱集熱管の一方の端部付近の部分分解図である。It is a partial exploded view of one end part vicinity of the solar heat collecting tube which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る太陽熱集熱管の一方の端部付近の部分断面図である。It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 1 of the present invention. この発明の実施の形態１に係る太陽熱集熱管の一方の端部付近の部分断面図である。It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 1 of the present invention. この発明の実施の形態２に係る太陽熱集熱管の一方の端部付近の部分分解図である。It is a partial exploded view of one end part vicinity of the solar heat collecting tube which concerns on Embodiment 2 of this invention. この発明の実施の形態２に係る太陽熱集熱管の一方の端部付近の部分断面図である。It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 2 of the present invention. この発明の実施の形態２に係る太陽熱集熱管の一方の端部付近の部分断面図である。It is a fragmentary sectional view near one end of the solar heat collecting tube according to Embodiment 2 of the present invention. 従来の太陽熱集熱管の一方の端部付近の部分断面図である。It is a fragmentary sectional view near one end of a conventional solar heat collecting tube.
　以下、この発明の実施の形態を添付図面に基づいて説明する。
　実施の形態１
　図１に示すように、太陽熱集熱管１は、外管であるガラス管２と、内管である熱媒体流通管３とを備えた二重管構造を有している。また、太陽熱集熱管１には、ガラス管２の両端に配置される環状の熱膨張差吸収手段であるベローズ４（図１には、一方のベローズ４のみが示されている）と、ベローズ４とガラス管２との間に設けられた環状のジョイント５と、ガラス管２にジョイント５を取付けるためのジョイント取付部でありガラス管２と同心円状に設けられた円筒形状の部材であるコバール金属環６とが設けられている。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1
As shown in FIG. 1, the solar heat collecting tube 1 has a double tube structure including a glass tube 2 as an outer tube and a heat medium flow tube 3 as an inner tube. Further, the solar heat collecting tube 1 includes a bellows 4 (only one bellows 4 is shown in FIG. 1) and a bellows 4 which are annular thermal expansion difference absorbing means disposed at both ends of the glass tube 2. An annular joint 5 provided between the glass tube 2 and a Kovar metal which is a joint attachment portion for attaching the joint 5 to the glass tube 2 and is a cylindrical member provided concentrically with the glass tube 2 A ring 6 is provided.
　ガラス管２の材質としては、特に限定されず、透明な耐熱ガラスを一般に用いることができる。透明な耐熱ガラス製のガラス管としては、例えば、ホウケイ酸ガラス管等が挙げられる。 The material of the glass tube 2 is not particularly limited, and transparent heat-resistant glass can be generally used. Examples of the transparent heat-resistant glass glass tube include a borosilicate glass tube.
　熱媒体流通管３の材質としては、特に限定されず、一般に、鉄系材料（例えば、ＳＵＳ、耐熱鋼、合金鋼、炭素鋼）、アルミニウム系材料等の耐熱性を有する金属を用いることができる。これらの中でも、使用環境（例えば、太陽熱集熱管１の加熱温度）を考慮すると、ＳＵＳ製や耐熱鋼製のものを用いることが好ましい。 The material of the heat medium flow pipe 3 is not particularly limited, and generally, a heat-resistant metal such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like can be used. . Among these, considering use environment (for example, heating temperature of the solar heat collecting tube 1), it is preferable to use those made of SUS or heat resistant steel.
　図２に示すように、ガラス管２と熱媒体流通管３とは中心軸Ｘを共有している。熱媒体流通管３の一方の端部３ａ付近の熱媒体流通管３の外周表面にベローズ４の一端が接続されている。ベローズ４の他端はジョイント５に接続されている。ジョイント５はコバール金属環６の一端に接続されており、コバール金属環６の他端はガラス管２の端部に接続されている。コバール金属環６とガラス管２との接続部をガラス金属接合部７と呼ぶ。ベローズ４とジョイント５とコバール金属環６とは中心軸Ｘを共有している。ベローズ４と、ジョイント５と、コバール金属環６とで、ガラス管２と熱媒体流通管３との間に環状の密閉空間を形成し、該密閉空間を真空状態にすることで真空空間８を形成している。 As shown in FIG. 2, the glass tube 2 and the heat medium flow tube 3 share the central axis X. One end of a bellows 4 is connected to the outer peripheral surface of the heat medium flow pipe 3 in the vicinity of one end 3a of the heat medium flow pipe 3. The other end of the bellows 4 is connected to the joint 5. The joint 5 is connected to one end of the Kovar metal ring 6, and the other end of the Kovar metal ring 6 is connected to the end of the glass tube 2. A connection portion between the Kovar metal ring 6 and the glass tube 2 is referred to as a glass metal joint portion 7. The bellows 4, the joint 5, and the Kovar metal ring 6 share the central axis X. The bellows 4, the joint 5, and the Kovar metal ring 6 form an annular sealed space between the glass tube 2 and the heat medium flow tube 3, and the vacuum space 8 is formed by bringing the sealed space into a vacuum state. Forming.
　ベローズ４は、ベローズ４の半径方向外側に向かって折れ目が形成される山折り形状部４ａと、ベローズ４の半径方向内側に向かって折れ目が形成される谷折り形状部４ｂとを交互にそれぞれ複数備えている。複数の各山折り形状部４ａの直径は、熱媒体流通管３の端部３ａに向かうに従いテーパ状に減少している。同様に、複数の各谷折り形状部４ｂの直径も、熱媒体流通管３の端部３ａに向かうに従いテーパ状に減少している。つまり、各山折り形状部４ａは、隣り合う山折り形状部４ａに対してベローズ４の半径方向にずれた位置であり、隣り合う山折り形状部４ａと隣り合う谷折り形状部４ｂとのおおむね中間の位置（中間部）に位置するように形成されている。同様に、各谷折り形状部４ｂは隣り合う谷折り形状部４ｂに対してベローズ４の半径方向にずれた位置であり、隣り合う山折り形状部４ａと隣り合う谷折り形状部４ｂとの中間部に位置するように形成されている。 The bellows 4 alternately includes a mountain fold-shaped portion 4 a in which a fold is formed toward the radially outer side of the bellows 4 and a valley fold-shaped portion 4 b in which a fold is formed toward the radially inner side of the bellows 4. Each has a plurality. The diameter of each of the plurality of mountain fold-shaped portions 4 a decreases in a tapered shape toward the end portion 3 a of the heat medium flow pipe 3. Similarly, the diameter of each of the plurality of valley-folded portions 4b also decreases in a tapered shape toward the end portion 3a of the heat medium flow pipe 3. That is, each mountain fold shape part 4a is a position shifted in the radial direction of the bellows 4 with respect to the adjacent mountain fold shape part 4a, and is generally an adjacent mountain fold shape part 4a and an adjacent valley fold shape part 4b. It is formed so as to be located at an intermediate position (intermediate portion). Similarly, each valley fold shape part 4b is a position shifted in the radial direction of the bellows 4 with respect to the adjacent valley fold shape part 4b, and is intermediate between the adjacent mountain fold shape part 4a and the adjacent valley fold shape part 4b. It is formed so as to be located in the part.
　ベローズ４の材質は、特に限定されず、例えば、鉄系材料（例えばＳＵＳ、耐熱鋼、合金鋼、炭素鋼）、アルミニウム系材料等の耐熱性を有する金属を用いることができる。また、ベローズ４の一部に別部材を用いてもよい。そして、ベローズ４と熱媒体流通管３及びジョイント５との接続方法は特に限定されず、例えば溶接、はんだ付け、ロウ付け等の公知の接合方法を用いることができる。 The material of the bellows 4 is not particularly limited, and for example, a metal having heat resistance such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material can be used. Further, another member may be used for a part of the bellows 4. And the connection method of the bellows 4, the heat medium distribution pipe 3, and the joint 5 is not specifically limited, For example, well-known joining methods, such as welding, soldering, and brazing, can be used.
　ジョイント５は、ジョイント円環形状部であるジョイント垂直面部５ａと、ジョイント円筒形状部５ｂと、ジョイント最内部５ｃと、ジョイント最外部５ｄとを備えている。ジョイント垂直面部５ａは、熱媒体流通管３と同心円状に設けられ、中心軸Ｘに対して垂直な円環板状の部材であり、ベローズ４と接続している。ジョイント円筒形状部５ｂは、熱媒体流通管３と同心円状の円筒形状の部材であり、ガラス金属接合部７の近傍でベローズ４を取り囲むように設けられており、ジョイント垂直面部５ａに接続している。ジョイント最内部５ｃは、ジョイント垂直面部５ａの内周縁に接続するように設けられ、熱媒体流通管３と同心円状の円筒形状の部材である。ジョイント最外部５ｄは、熱媒体流通管３と同心円状に設けられ、中心軸Ｘに対して垂直な円環板状の部材であり、ジョイント円筒形状部５ｂの端部とコバール金属環６とにそれぞれ接続している。ジョイント円筒形状部５ｂは、中心軸Ｘ方向に対して少なくともコバール金属環６と同じ幅を持つ。そして、ジョイント５は全体としてベローズ４を取り囲むように設けられている。また、ジョイント５の材質は、特に限定されず、例えば、鉄系材料（例えばＳＵＳ、耐熱鋼、合金鋼、炭素鋼）、アルミニウム系材料等の光を透過せず耐熱性を有する金属を用いることができる。そして、ジョイント５とコバール金属環６との接続方法は特に限定されず、例えば溶接、はんだ付け、ロウ付け等の公知の接合方法を用いることができる。 The joint 5 includes a joint vertical surface portion 5a that is a joint ring-shaped portion, a joint cylindrical portion 5b, a joint innermost portion 5c, and a joint outermost portion 5d. The joint vertical surface portion 5 a is an annular plate-shaped member that is provided concentrically with the heat medium flow pipe 3 and is perpendicular to the central axis X, and is connected to the bellows 4. The joint cylindrical portion 5b is a cylindrical member concentric with the heat medium flow pipe 3, and is provided so as to surround the bellows 4 in the vicinity of the glass metal joint portion 7, and is connected to the joint vertical surface portion 5a. Yes. The joint innermost part 5c is provided so as to be connected to the inner peripheral edge of the joint vertical surface part 5a, and is a cylindrical member concentric with the heat medium flow pipe 3. The joint outermost part 5d is an annular plate-like member that is provided concentrically with the heat medium flow pipe 3, and is perpendicular to the central axis X. The joint outermost part 5d is connected to the end of the joint cylindrical part 5b and the Kovar metal ring 6. Each is connected. The joint cylindrical portion 5b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction. The joint 5 is provided so as to surround the bellows 4 as a whole. The material of the joint 5 is not particularly limited, and for example, a metal having heat resistance that does not transmit light, such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like is used. Can do. And the connection method of the joint 5 and the Kovar metal ring 6 is not specifically limited, For example, well-known joining methods, such as welding, soldering, and brazing, can be used.
　コバール金属環６は材質がコバールであり、線膨張係数がガラス管２に近い。コバール金属環６はベローズ４とジョイント５とを取り囲むように設けられる。コバール金属環６はその端部がガラス管２の端部に差し込まれるように接続される。 The Kovar metal ring 6 is made of Kovar and has a linear expansion coefficient close to that of the glass tube 2. The Kovar metal ring 6 is provided so as to surround the bellows 4 and the joint 5. The Kovar metal ring 6 is connected such that its end is inserted into the end of the glass tube 2.
　矢印Ａで示されている熱媒体流通管３の端部３ａからジョイント最内部５ｃまでの間の領域は、太陽光の集光に寄与しないので、太陽熱集熱管１の非アクティブエリアである。
　以上で説明した構成は太陽熱集熱管１の一方の端部付近の構成であるが、太陽熱集熱管１の他方の端部付近の構成も同じである。 The region between the end 3a of the heat medium flow pipe 3 and the joint innermost part 5c indicated by the arrow A is an inactive area of the solar heat collecting pipe 1 because it does not contribute to the collection of sunlight.
The configuration described above is a configuration near one end of the solar heat collecting tube 1, but the configuration near the other end of the solar heat collecting tube 1 is the same.
　次に、この発明の実施の形態１に係る太陽熱集熱管の動作を説明する。
　太陽熱集熱管１は、加熱されていない時は、図２に示すように、ベローズ４が最も縮んだ状態である。ここで、ベローズ４の各山折り形状部４ａと各谷折り形状部４ｂと中間部との中心軸Ｘ方向に関する長さを各山折り形状部４ａと各谷折り形状部４ｂと中間部とのそれぞれについての幅と呼ぶと、各山折り形状部４ａ及び各谷折り形状部４ｂの幅は、中間部の幅よりも大きい。そして、各山折り形状部４ａは、端部３ａとは反対側の隣の山折り形状部４ａ及び谷折り形状部４ｂの半径方向に対して、中間部と同じ高さに位置するように形成されているので、端部３ａと同じ側の隣の山折り形状部４ａを中間部に収めることができる。また、各谷折り形状部４ｂは、端部３ａと同じ側の隣の山折り形状部４ａ及び谷折り形状部４ｂの半径方向に対して、中間部と同じ高さに位置するように形成されているので、端部３ａとは反対側の山折り形状部４ａ及び谷折り形状部４ｂを中間部に収めることができる。中間部の幅よりも大きい幅を持つ山折り形状部４ａ及び谷折り形状部４ｂを各中間部に収めることができるので、各山折り形状部４ａと各谷折り形状部４ｂとの直径が均一である場合よりも、ベローズ４の最短寸法が小さくなる。 Next, the operation of the solar heat collecting tube according to Embodiment 1 of the present invention will be described.
When the solar heat collecting tube 1 is not heated, the bellows 4 is in the most contracted state as shown in FIG. Here, the length in the central axis X direction of each mountain fold shape portion 4a, each valley fold shape portion 4b, and the intermediate portion of the bellows 4 is determined between each mountain fold shape portion 4a, each valley fold shape portion 4b, and the intermediate portion. If it calls the width about each, the width | variety of each mountain fold shape part 4a and each valley fold shape part 4b is larger than the width | variety of an intermediate part. And each mountain fold shape part 4a is formed so that it may be located in the same height as an intermediate part with respect to the radial direction of the adjacent mountain fold shape part 4a and valley fold shape part 4b on the opposite side to the edge part 3a. Therefore, the adjacent mountain fold shaped portion 4a on the same side as the end portion 3a can be accommodated in the intermediate portion. Moreover, each valley fold shape part 4b is formed so that it may be located in the same height as an intermediate part with respect to the radial direction of the adjacent mountain fold shape part 4a and the valley fold shape part 4b on the same side as the edge part 3a. Therefore, the mountain fold shape portion 4a and the valley fold shape portion 4b opposite to the end portion 3a can be accommodated in the intermediate portion. Since the mountain fold shape portion 4a and the valley fold shape portion 4b having a width larger than the width of the intermediate portion can be accommodated in each intermediate portion, the diameters of each mountain fold shape portion 4a and each valley fold shape portion 4b are uniform. The shortest dimension of the bellows 4 is smaller than that of the case.
　太陽熱集熱管１の使用時には、熱媒体流通管３の内部に流通する熱媒体がガラス管２を透過した太陽光の熱によって加熱される。この時、熱媒体の熱によって、ガラス管２及び熱媒体流通管３が熱膨張するが、それらの材質の違いに起因して、ガラス管２と熱媒体流通管３との間に熱膨張差が生じる。ガラス管２よりも熱媒体流通管３の方が熱膨張率は大きいので、図３に示すように熱媒体流通管３がガラス管２よりも端部３ａ方向により突き出すようになる。この時、ベローズ４が熱媒体流通管３の長手方向に伸びることで、ガラス管２と熱媒体流通管３との熱膨張差を吸収する。また、この時の太陽熱集熱管１の非アクティブエリアは、ベローズ４の最短寸法時の非アクティブエリアである矢印Ａで示されている領域と、熱膨張差の吸収のためにベローズ４が伸びた分の領域である矢印Ｂで示された領域を加えた矢印Ａ’で示された領域となる。 When the solar heat collecting tube 1 is used, the heat medium flowing inside the heat medium flow tube 3 is heated by the heat of sunlight transmitted through the glass tube 2. At this time, the glass tube 2 and the heat medium flow tube 3 are thermally expanded by the heat of the heat medium. However, due to the difference in the materials, the difference in thermal expansion between the glass tube 2 and the heat medium flow tube 3 is caused. Occurs. Since the thermal expansion coefficient of the heat medium flow tube 3 is larger than that of the glass tube 2, the heat medium flow tube 3 protrudes in the direction of the end 3 a rather than the glass tube 2 as shown in FIG. 3. At this time, the bellows 4 extends in the longitudinal direction of the heat medium flow tube 3 to absorb the difference in thermal expansion between the glass tube 2 and the heat medium flow tube 3. In addition, the inactive area of the solar heat collecting tube 1 at this time is the area indicated by the arrow A which is the inactive area at the time of the shortest dimension of the bellows 4, and the bellows 4 extends due to absorption of the thermal expansion difference. The area indicated by the arrow A ′ is obtained by adding the area indicated by the arrow B which is the minute area.
　前記したとおり、ベローズ４が縮む際の最小寸法が小さくなるので、矢印Ａで示される領域が小さくなり、その結果、非アクティブエリアである矢印Ａ’で示される領域も小さくなる。非アクティブエリアの領域を縮小することでアクティブエリアの領域を拡大して太陽熱集熱管１の集熱効率を上げることができる。 As described above, since the minimum dimension when the bellows 4 is contracted is reduced, the area indicated by the arrow A is reduced, and as a result, the area indicated by the arrow A ′ that is an inactive area is also reduced. By reducing the area of the inactive area, the area of the active area can be enlarged and the heat collection efficiency of the solar heat collecting tube 1 can be increased.
　また、太陽熱集熱管１の使用中には、高温の熱媒体流通管３から矢印Ｃで示されるように輻射熱が輻射される。さらに、太陽光が熱媒体流通管３の表面に対して斜めに反射することにより、矢印Ｄで示されるような反射光が生じる。ガラス金属接合部７がこれらに直接曝されると、ガラス金属接合部７がこれらの熱によって損傷する等の不具合が発生する可能性がある。またさらに、熱媒体流通管３の表面からの熱がベローズ４とジョイント５とコバール金属環６とを介してガラス金属接合部７に伝わる。この熱が大きすぎると、やはりガラス金属接合部７が損傷する等の不具合が発生する可能性がある。 Further, while the solar heat collecting tube 1 is in use, radiant heat is radiated from the high-temperature heat medium circulation tube 3 as indicated by an arrow C. Further, the sunlight is reflected obliquely with respect to the surface of the heat medium flow pipe 3, thereby generating reflected light as indicated by an arrow D. When the glass metal joint 7 is directly exposed to these, there is a possibility that a malfunction such as damage of the glass metal joint 7 due to these heats may occur. Furthermore, heat from the surface of the heat medium flow pipe 3 is transmitted to the glass metal joint 7 through the bellows 4, the joint 5, and the Kovar metal ring 6. If this heat is too great, there is a possibility that a problem such as damage to the glass-metal joint 7 may occur.
　この実施の形態１では、ジョイント円筒形状部５ｂが、熱媒体流通管３とガラス金属接合部７との間に配置され、熱媒体流通管３からの矢印Ｃで示される輻射熱を遮るので、輻射熱がガラス金属接合部７に直接到達することを防ぐ。また、ジョイント円筒形状部５ｂは、中心軸Ｘ方向に対して少なくともコバール金属環６と同じ幅を持つので、ジョイント垂直面部５ａは中心軸Ｘ方向についてコバール金属環６のガラス管２に接合している側の端と同じ位置かあるいはそれよりもさらに端部３ａから遠い側に位置する。それにより、ジョイント垂直面部５ａが熱媒体流通管３からの矢印Ｄで示される反射光を遮るので、反射光がガラス金属接合部７に直接到達することを防ぐ。また、ジョイント垂直面部５ａにジョイント円筒形状部５ｂが接続され、ジョイント円筒形状部５ｂにジョイント最外部５ｄが接続されていることにより、ジョイント円筒形状部５ｂにコバール金属環６が接続されている構成と比較して、熱媒体流通管３の表面からの熱がベローズ４とジョイント５とコバール金属環６とを介してガラス金属接合部７に伝達する経路が、ジョイント円筒形状部５ｂ及びジョイント最外部５ｄの部分だけ長くなるため、熱媒体流通管３からの熱がガラス金属接合部７に到達しにくくなる。したがって、熱によるガラス金属接合部７の損傷が発生する可能性を小さくすることができる。 In the first embodiment, the joint cylindrical portion 5b is disposed between the heat medium flow pipe 3 and the glass metal joint 7, and shields the radiant heat indicated by the arrow C from the heat medium flow pipe 3. Is prevented from reaching the glass-metal joint 7 directly. Further, since the joint cylindrical portion 5b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction, the joint vertical surface portion 5a is joined to the glass tube 2 of the Kovar metal ring 6 in the central axis X direction. It is located at the same position as the end on the other side or further on the side farther from the end 3a. Thereby, since the joint vertical surface part 5a blocks the reflected light indicated by the arrow D from the heat medium flow pipe 3, the reflected light is prevented from reaching the glass metal joint 7 directly. Further, the joint cylindrical portion 5b is connected to the joint vertical surface portion 5a, and the joint outermost portion 5d is connected to the joint cylindrical portion 5b, whereby the Kovar metal ring 6 is connected to the joint cylindrical portion 5b. Compared to the above, the path through which the heat from the surface of the heat medium flow pipe 3 is transmitted to the glass metal joint 7 via the bellows 4, the joint 5, and the Kovar metal ring 6 is the joint cylindrical part 5b and the outermost part of the joint. Since only the portion 5d becomes longer, it becomes difficult for the heat from the heat medium flow pipe 3 to reach the glass metal joint portion 7. Therefore, it is possible to reduce the possibility that the glass-metal joint 7 is damaged by heat.
　また、この実施の形態１では、特許文献１に記載の発明と比較して、フランジ１１８（図７参照）に相当する部材を設けていない。したがって、フランジ１１８に相当する部材を設ける場合と比較して部品点数が少なくなり、さらに部品同士の接続箇所が少なくなる。部品同士の接続箇所は、もし故障や製造上の問題で接続に不具合が生じると真空空間８の密閉漏れが発生して真空空間８の真空度が低下し、太陽熱集熱管１の効率低下や機能不全につながる。このため、部品同士の接続箇所は少ないことが望ましい。ゆえにこの実施の形態１のフランジ１１８に相当する部材を設けないことは、特許文献１に記載の発明と比較して利点となる。 Further, in the first embodiment, a member corresponding to the flange 118 (see FIG. 7) is not provided as compared with the invention described in Patent Document 1. Therefore, the number of parts is reduced as compared with the case where a member corresponding to the flange 118 is provided, and the number of parts connected to each other is reduced. If the connection between parts is damaged due to a failure or manufacturing problem, the vacuum space 8 is leaked, the vacuum degree of the vacuum space 8 is lowered, and the efficiency and function of the solar heat collecting tube 1 are reduced. Leads to failure. For this reason, it is desirable that the number of parts to be connected is small. Therefore, not providing a member corresponding to the flange 118 of the first embodiment is an advantage compared to the invention described in Patent Document 1.
　このように、ベローズ４の複数の山折り形状部４ａ及び谷折り形状部４ｂの直径が、熱媒体流通管３の端部３ａに向かうに従いテーパ状に減少していることで、ベローズ４の最短寸法が短くなるので、太陽熱集熱管１のアクティブエリアを拡大することができる。 As described above, the diameters of the plurality of mountain fold-shaped portions 4a and valley fold-shaped portions 4b of the bellows 4 decrease in a tapered shape toward the end portion 3a of the heat medium flow pipe 3, so that the shortest of the bellows 4 is achieved. Since a dimension becomes short, the active area of the solar heat collecting tube 1 can be expanded.
　実施の形態２
　次に、この発明の実施の形態２に係る太陽熱集熱管を説明する。尚、実施の形態２において、図１～図３の参照符号と同一の符号は、同一または同様な構成要素であるので、その詳細な説明は省略する。
　この発明の実施の形態２に係る太陽熱集熱管は、実施の形態１に対して、ベローズの形状を変更したものである。 Embodiment 2
Next, a solar heat collecting tube according to Embodiment 2 of the present invention will be described. In the second embodiment, the same reference numerals as those in FIGS. 1 to 3 are the same or similar components, and thus detailed description thereof is omitted.
The solar heat collecting tube according to the second embodiment of the present invention is obtained by changing the shape of the bellows with respect to the first embodiment.
　図４に示すように、太陽熱集熱管２１には、ガラス管２の両端に配置される環状の熱膨張差吸収手段であるベローズ２４（図４には、一方のベローズ２４のみが示されている）と、円環状のフランジ２９と、ベローズ２４とガラス管２との間に設けられた環状のジョイント２５と、コバール金属環６とが設けられている。 As shown in FIG. 4, the solar heat collecting tube 21 has a bellows 24 that is an annular thermal expansion difference absorbing means disposed at both ends of the glass tube 2 (only one bellows 24 is shown in FIG. 4). ), An annular flange 29, an annular joint 25 provided between the bellows 24 and the glass tube 2, and a Kovar metal ring 6.
　図５に示すようにフランジ２９は、フランジ２９の外周縁に沿って設けられた円筒形状の外周縁屈折部２９ａと、フランジ２９の内周縁に沿って設けられた円筒形状の内周縁屈折部２９ｂとを備えている。内周縁屈折部２９ｂが、熱媒体流通管３の端部３ａ付近の熱媒体流通管３の外周表面に接続されている。ベローズ２４の一端が外周縁屈折部２９ａに接続されている。ベローズ２４の他端が、ジョイント２５に接続されている。ベローズ２４は、ベローズ２４の半径方向外側に向かって折れ目が形成される山折り形状部２４ａと、ベローズ２４の半径方向内側に向かって折れ目が形成される谷折り形状部２４ｂとを交互にそれぞれ複数備えている。複数の各山折り形状部２４ａの直径は、熱媒体流通管３の端部３ａ方向に向かうに従いテーパ状に増大している。同様に、複数の各谷折り形状部２４ｂの直径も、熱媒体流通管３の端部３ａに向かうに従いテーパ状に増大している。つまり、各山折り形状部２４ａは、隣り合う山折り形状部２４ａに対してベローズ２４の半径方向にずれた位置であり、隣り合う山折り形状部２４ａと隣り合う谷折り形状部２４ｂとの中間部になるように形成されている。同様に、各谷折り形状部２４ｂは隣り合う谷折り形状部２４ｂに対してベローズ２４の半径方向にずれた位置であり、隣り合う山折り形状部２４ａと隣り合う谷折り形状部２４ｂとの中間部になるように形成されている。 As shown in FIG. 5, the flange 29 includes a cylindrical outer peripheral refracting portion 29 a provided along the outer peripheral edge of the flange 29 and a cylindrical inner peripheral refracting portion 29 b provided along the inner peripheral edge of the flange 29. And. The inner peripheral refracting portion 29 b is connected to the outer peripheral surface of the heat medium flow tube 3 in the vicinity of the end 3 a of the heat medium flow tube 3. One end of the bellows 24 is connected to the outer peripheral refracting portion 29a. The other end of the bellows 24 is connected to the joint 25. The bellows 24 alternately includes a mountain fold-shaped portion 24a in which a fold is formed toward the radially outer side of the bellows 24 and a valley fold-shaped portion 24b in which a fold is formed toward the radially inner side of the bellows 24. Each has a plurality. The diameter of each of the plurality of mountain fold-shaped portions 24 a increases in a tapered shape toward the end 3 a of the heat medium flow pipe 3. Similarly, the diameter of each of the plurality of valley-folded portions 24b also increases in a tapered shape toward the end portion 3a of the heat medium flow pipe 3. That is, each mountain fold shape part 24a is a position shifted in the radial direction of the bellows 24 with respect to the adjacent mountain fold shape part 24a, and is intermediate between the adjacent mountain fold shape part 24a and the adjacent valley fold shape part 24b. It is formed to be a part. Similarly, each valley fold shape portion 24b is a position shifted in the radial direction of the bellows 24 with respect to the adjacent valley fold shape portion 24b, and is intermediate between the adjacent mountain fold shape portion 24a and the adjacent valley fold shape portion 24b. It is formed to be a part.
　ベローズ２４の材質は、実施の形態１のベローズ４と同じである。フランジ２９の材質は、特に限定されず、例えば、鉄系材料（例えばＳＵＳ、耐熱鋼、合金鋼、炭素鋼）、アルミニウム系材料等の耐熱性を有する金属を用いることができる。そして、フランジ２９とベローズ２４との接続方法は特に限定されず、例えば溶接、はんだ付け、ロウ付け等の公知の接合方法を用いることができる。 The material of the bellows 24 is the same as that of the bellows 4 of the first embodiment. The material of the flange 29 is not particularly limited, and for example, a heat-resistant metal such as an iron-based material (for example, SUS, heat-resistant steel, alloy steel, carbon steel), an aluminum-based material, or the like can be used. And the connection method of the flange 29 and the bellows 24 is not specifically limited, For example, well-known joining methods, such as welding, soldering, and brazing, can be used.
　ジョイント２５は、ジョイント円環形状部であるジョイント垂直面部２５ａと、ジョイント円筒形状部２５ｂと、ジョイント最内部２５ｃと、ジョイント最外部２５ｄと、ジョイント逃げ部２５ｅとを備えている。ジョイント垂直面部２５ａは、熱媒体流通管３と同心円状に設けられ、中心軸Ｘに対して垂直な円環板状の部材であり、ベローズ２４と接続している。ジョイント円筒形状部２５ｂは、熱媒体流通管３と同心円状の円筒形状であり、ガラス金属接合部７の近傍でベローズ４を取り囲むように設けられており、ジョイント垂直面部２５ａに接続している。ジョイント最内部２５ｃは、ジョイント垂直面部２５ａの内周縁に接続するように設けられ、熱媒体流通管３と同心円状の円筒形状の部材である。ジョイント最外部２５ｄは、熱媒体流通管３と同心円状に設けられ、中心軸Ｘに対して垂直な円環形状の部材であり、ジョイント円筒形状部２５ｂの端部とコバール金属環６とにそれぞれ接続している。ジョイント円筒形状部２５ｂは、中心軸Ｘ方向に対して少なくともコバール金属環６と同じ幅を持つ。ジョイント２５は全体としてベローズ２４を取り囲むように設けられている。ジョイント逃げ部２５ｅは、ベローズ２４が縮んだ時に、ジョイント垂直面部２５ａに最も近い山折り形状部２４ａが入り込むための凹部である。ジョイント円筒形状部２５ｂは、中心軸Ｘ方向に対して少なくともコバール金属環６と同じ幅を持つ。また、ジョイント２５の材質は、ジョイント５と同じである。さらに、ジョイント２５とコバール金属環６との接続方法はジョイント５とコバール金属環６との接続方法と同じである。 The joint 25 includes a joint vertical surface portion 25a which is a joint ring-shaped portion, a joint cylindrical portion 25b, a joint innermost portion 25c, a joint outermost portion 25d, and a joint escape portion 25e. The joint vertical surface portion 25 a is an annular plate member that is provided concentrically with the heat medium flow pipe 3 and is perpendicular to the central axis X, and is connected to the bellows 24. The joint cylindrical portion 25b has a cylindrical shape concentric with the heat medium flow pipe 3, is provided so as to surround the bellows 4 in the vicinity of the glass metal joint portion 7, and is connected to the joint vertical surface portion 25a. The joint innermost portion 25c is provided so as to be connected to the inner peripheral edge of the joint vertical surface portion 25a, and is a cylindrical member concentric with the heat medium flow pipe 3. The joint outermost part 25d is an annular member that is concentrically provided with the heat medium flow pipe 3 and is perpendicular to the central axis X. The joint outermost part 25d is connected to the end of the joint cylindrical part 25b and the Kovar metal ring 6, respectively. Connected. The joint cylindrical portion 25b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction. The joint 25 is provided so as to surround the bellows 24 as a whole. The joint escape portion 25e is a recess into which the mountain fold-shaped portion 24a closest to the joint vertical surface portion 25a enters when the bellows 24 contracts. The joint cylindrical portion 25b has at least the same width as the Kovar metal ring 6 with respect to the central axis X direction. The material of the joint 25 is the same as that of the joint 5. Further, the connection method between the joint 25 and the Kovar metal ring 6 is the same as the connection method between the joint 5 and the Kovar metal ring 6.
　次に、この発明の実施の形態２に係る太陽熱集熱管の動作を説明する。
　太陽熱集熱管２１は、加熱されていない時は図５に示すようにベローズ２４が最短寸法まで縮んでいる。最小寸法まで縮んでいる時のベローズ２４は実施の形態１と同様に、山折り形状部２４ａと谷折り形状部２４ｂとの幅は中間部の幅よりも大きい。そして、中間部の幅よりも大きい幅を持つ山折り形状部２４ａと谷折り形状部２４ｂとを中間部の位置に収めることができるので、各山折り形状部２４ａと各谷折り形状部２４ｂとの直径が均一である場合よりもベローズ２４が縮む際の最短寸法が小さくなる。 Next, the operation of the solar heat collecting tube according to Embodiment 2 of the present invention will be described.
When the solar heat collecting tube 21 is not heated, the bellows 24 is contracted to the shortest dimension as shown in FIG. When the bellows 24 is contracted to the minimum dimension, the width of the mountain fold shape portion 24a and the valley fold shape portion 24b is larger than the width of the intermediate portion, as in the first embodiment. Since the mountain fold shape portion 24a and the valley fold shape portion 24b having a width larger than the width of the intermediate portion can be accommodated at the position of the intermediate portion, each mountain fold shape portion 24a and each valley fold shape portion 24b The shortest dimension when the bellows 24 contracts is smaller than when the diameter is uniform.
　太陽熱集熱管２１の使用時には実施の形態１と同様に、図６に示すように熱媒体流通管３とガラス管２との熱膨張差により熱媒体流通管３がガラス管２よりも端部３ａ方向により突き出すようになる。この時、ベローズ２４が熱媒体流通管３の長手方向に伸びることで、ガラス管２と熱媒体流通管３との熱膨張差を吸収する。また、この時の太陽熱集熱管２１の非アクティブエリアは、ベローズ２４の最短寸法時の非アクティブエリアである矢印Ｅで示されている領域と、熱膨張差の吸収のためにベローズ２４が伸びた分の領域である矢印Ｆで示された領域とを加えた矢印Ｅ’で示された領域となる。 When the solar heat collecting tube 21 is used, as in the first embodiment, the heat medium flow tube 3 is more end 3a than the glass tube 2 due to the difference in thermal expansion between the heat medium flow tube 3 and the glass tube 2 as shown in FIG. Protrudes depending on the direction. At this time, the bellows 24 extends in the longitudinal direction of the heat medium flow tube 3 to absorb the difference in thermal expansion between the glass tube 2 and the heat medium flow tube 3. In addition, the inactive area of the solar heat collecting tube 21 at this time is the area indicated by the arrow E, which is the inactive area when the bellows 24 is the shortest dimension, and the bellows 24 is extended to absorb the difference in thermal expansion. A region indicated by an arrow E ′ is added to a region indicated by an arrow F which is a minute region.
　前記したとおり、ベローズ２４が縮む際の最小寸法が小さくなるので、矢印Ｅで示される領域が小さくなり、その結果非アクティブエリアである矢印Ｅ’で示される領域も小さくなる。非アクティブエリアの領域を縮小することでアクティブエリアの領域を拡大して太陽熱集熱管２１の集熱効率を上げることができる。 As described above, since the minimum dimension when the bellows 24 is contracted is reduced, the area indicated by the arrow E is reduced, and as a result, the area indicated by the arrow E ′ which is an inactive area is also reduced. By reducing the area of the inactive area, the area of the active area can be enlarged and the heat collection efficiency of the solar heat collecting tube 21 can be increased.
　また、この実施の形態２では、実施の形態１と同様に、ジョイント円筒形状部２５ｂが、熱媒体流通管３からの矢印Ｃで示される輻射熱がガラス金属接合部７に直接到達することを防ぎ、ジョイント垂直面部２５ａが熱媒体流通管３からの矢印Ｄで示される反射光がガラス金属接合部７に直接到達することを防いでいる。さらに、ジョイント垂直面部２５ａにジョイント円筒形状部２５ｂが接続され、ジョイント円筒形状部２５ｂにジョイント最外部２５ｄが接続されていることにより、ジョイント円筒形状部２５ｂにコバール金属環６が接続された場合と比較して、熱媒体流通管３の表面からの熱がベローズ２４とジョイント２５とコバール金属環６とを介してガラス金属接合部７に伝達する経路が、ジョイント円筒形状部２５ｂ及びジョイント最外部２５ｄの部分だけ長くなるため、熱媒体流通管３からの熱がガラス金属接合部７に到達しにくくなる。したがって、熱によるガラス金属接合部７の損傷が発生する可能性を小さくすることができる。 Further, in the second embodiment, as in the first embodiment, the joint cylindrical portion 25b prevents the radiant heat indicated by the arrow C from the heat medium flow pipe 3 from reaching the glass metal joint portion 7 directly. The joint vertical surface portion 25a prevents the reflected light indicated by the arrow D from the heat medium flow pipe 3 from reaching the glass metal joint portion 7 directly. Furthermore, when the joint cylindrical portion 25b is connected to the joint vertical surface portion 25a, and the joint outermost portion 25d is connected to the joint cylindrical portion 25b, the Kovar metal ring 6 is connected to the joint cylindrical portion 25b. In comparison, the path through which the heat from the surface of the heat medium flow pipe 3 is transmitted to the glass metal joint 7 via the bellows 24, the joint 25, and the Kovar metal ring 6 is the joint cylindrical part 25b and the joint outermost part 25d. Therefore, it becomes difficult for the heat from the heat medium flow pipe 3 to reach the glass metal joint 7. Therefore, it is possible to reduce the possibility that the glass-metal joint 7 is damaged by heat.
　このように、ベローズ２４の複数の山折り形状部２４ａ及び谷折り形状部２４ｂの直径が、熱媒体流通管３の端部３ａに向かうに従いテーパ状に増大していることで、ベローズ２４の最短寸法が短くなるので、太陽熱集熱管１のアクティブエリアを拡大することができる。 As described above, the diameters of the plurality of mountain fold-shaped portions 24 a and valley fold-shaped portions 24 b of the bellows 24 increase in a tapered shape toward the end portion 3 a of the heat medium flow pipe 3, so that the shortest of the bellows 24 is achieved. Since a dimension becomes short, the active area of the solar heat collecting tube 1 can be expanded.
　実施の形態１では、ベローズ４の複数の山折り形状部４ａ及び谷折り形状部４ｂは、熱媒体流通管３の端部３ａに向かうに従いテーパ状に減少し、実施の形態２では、ベローズ２４の複数の山折り形状部２４ａ及び谷折り形状部２４ｂは、熱媒体流通管３の端部３ａに向かうに従いテーパ状に増大していたが、この形態に限定するものではない。ベローズの複数の山折り形状部及び谷折り形状部のうち、少なくとも二つの隣り合っている山折り形状部同士又は谷折り形状部同士の直径が異なっていればよい。例えば、ベローズ複数の山折り形状部及び谷折り形状部のうち、ベローズの一方の端部に設けられた山折り形状部又は谷折り形状部と、他方の端部に設けられた山折り形状部又は谷折り形状部との間に設けられている山折り形状部及び谷折り形状部の直径が一番大きくなるように形成されていてもよい。 In the first embodiment, the plurality of mountain fold-shaped portions 4a and valley fold-shaped portions 4b of the bellows 4 decrease in a tapered shape toward the end portion 3a of the heat medium flow pipe 3, and in the second embodiment, the bellows 24 The plurality of mountain fold-shaped portions 24a and valley fold-shaped portions 24b increase in a tapered shape toward the end 3a of the heat medium flow pipe 3, but are not limited to this configuration. Of the plurality of mountain fold shape portions and valley fold shape portions of the bellows, at least two adjacent mountain fold shape portions or valley fold shape portions may have different diameters. For example, among the plurality of mountain fold-shaped portions and valley fold-shaped portions of the bellows, a mountain fold-shaped portion or a valley fold-shaped portion provided at one end of the bellows and a mountain fold-shaped portion provided at the other end Or you may form so that the diameter of the mountain fold shape part and valley fold shape part provided between valley fold shape parts may become the largest.
　実施の形態１では、ジョイント５は、ジョイント垂直面部５ａと、ジョイント円筒形状部５ｂと、ジョイント最内部５ｃと、ジョイント最外部５ｄとを備えており、実施の形態２では、ジョイント２５は、ジョイント垂直面部２５ａと、ジョイント円筒形状部２５ｂと、ジョイント最内部２５ｃと、ジョイント最外部２５ｄと、ジョイント逃げ部２５ｅとを備えていたが、この形態に限定するものではない。例えば、実施の形態１において、ジョイント円筒形状部５ｂ及びジョイント最外部５ｄを設けず、ジョイント垂直面部５ａにコバール金属環６を接続してもよい。この場合、ジョイント５はジョイント垂直面部５ａとジョイント最内部５ｃとだけの構成となる。また、実施の形態２において、ジョイント円筒形状部２５ｂ及びジョイント最外部２５ｄを設けず、ジョイント垂直面部２５ａにコバール金属環６を接続してもよい。この場合、ジョイント２５はジョイント垂直面部２５ａとジョイント最内部２５ｃとジョイント逃げ部２５ｅとだけの構成となる。これにより、ジョイント５又はジョイント２５の形状が簡単になり、ジョイント５又はジョイント２５の製造及び加工が容易になる。 In the first embodiment, the joint 5 includes a joint vertical surface portion 5a, a joint cylindrical portion 5b, a joint innermost portion 5c, and a joint outermost portion 5d. In the second embodiment, the joint 25 is a joint Although the vertical surface portion 25a, the joint cylindrical portion 25b, the joint innermost portion 25c, the joint outermost portion 25d, and the joint escape portion 25e are provided, the present invention is not limited to this configuration. For example, in Embodiment 1, the joint cylindrical shape portion 5b and the joint outermost portion 5d may not be provided, and the Kovar metal ring 6 may be connected to the joint vertical surface portion 5a. In this case, the joint 5 has only the joint vertical surface portion 5a and the joint innermost portion 5c. In the second embodiment, the Kovar metal ring 6 may be connected to the joint vertical surface portion 25a without providing the joint cylindrical portion 25b and the joint outermost portion 25d. In this case, the joint 25 includes only a joint vertical surface portion 25a, a joint innermost portion 25c, and a joint relief portion 25e. Thereby, the shape of the joint 5 or the joint 25 becomes simple, and manufacture and processing of the joint 5 or the joint 25 become easy.
　実施の形態１及び２では、コバール金属環６はコバール金属を材料としていたが、線膨張係数がガラス管２に近い別の材料を用いてもよい。 In Embodiments 1 and 2, the Kovar metal ring 6 is made of Kovar metal, but another material having a linear expansion coefficient close to that of the glass tube 2 may be used.
　実施の形態１では、ジョイント垂直面部５ａとジョイント最外部５ｄとは中心軸Ｘに対して垂直に設けられており、実施の形態２では、ジョイント垂直面部２５ａとジョイント最外部２５ｄとは中心軸Ｘに対して垂直に設けられていたが、この形態に限定するものではない。実施の形態１では、ジョイント垂直面部５ａ及びジョイント最外部５ｄは、中心軸Ｘと９０度以外のある角度をなして交差するように設けられていてもよい。同様に、実施の形態２でも、ジョイント垂直面部２５ａ及びジョイント最外部２５ｄは、中心軸Ｘと９０度以外のある角度をなして交差するように設けられていてもよい。 In the first embodiment, the joint vertical surface portion 5a and the joint outermost portion 5d are provided perpendicular to the central axis X, and in the second embodiment, the joint vertical surface portion 25a and the joint outermost portion 25d are the central axis X. However, the present invention is not limited to this form. In the first embodiment, the joint vertical surface part 5a and the joint outermost part 5d may be provided so as to intersect with the central axis X at an angle other than 90 degrees. Similarly, also in the second embodiment, the joint vertical surface portion 25a and the joint outermost portion 25d may be provided so as to intersect with the central axis X at an angle other than 90 degrees.

Claims (5)

  1. 　外管と、
    　内管と、
    　前記内管の端部付近の内管の表面に設置され、複数の山折り形状部及び谷折り形状部が交互に配置された伸縮可能な熱膨張差吸収手段と
    を備え、
    　前記外管と前記内管とは前記熱膨張差吸収手段を介して接続され、
    　複数の前記山折り形状部及び前記谷折り形状部のうち、少なくとも二つの隣り合っている前記山折り形状部同士及び前記谷折り形状部同士の直径が異なる太陽熱集熱管。     An outer tube,
    An inner pipe,
    It is installed on the surface of the inner pipe in the vicinity of the end of the inner pipe, and includes a heat expansion difference absorbing means capable of expansion and contraction in which a plurality of mountain fold-shaped portions and valley fold-shaped portions are alternately arranged,
    The outer tube and the inner tube are connected via the thermal expansion difference absorbing means,
    A solar heat collecting tube in which at least two adjacent mountain fold shape portions and valley fold shape portions have different diameters among the plurality of mountain fold shape portions and valley fold shape portions.
  2. 　前記山折り形状部及び前記谷折り形状部の直径が、前記内管の端部に向かうに従いテーパ状に変化している請求項１に記載の太陽熱集熱管。 The solar heat collecting tube according to claim 1, wherein the diameters of the mountain fold shape portion and the valley fold shape portion change in a tapered shape toward an end portion of the inner tube.
  3. 　前記山折り形状部及び前記谷折り形状部の直径が、前記内管の端部に向かうに従い減少している請求項２に記載の太陽熱集熱管。 The solar heat collecting tube according to claim 2, wherein the diameters of the mountain fold shape portion and the valley fold shape portion decrease toward the end of the inner tube.
  4. 　前記外管と、前記熱膨張差吸収手段とが、ジョイント取付部と、ジョイントとを介して接続され、
    　前記ジョイント取付部は、前記外管と同心円状の円筒形状を有し、一端が前記外管に接続され、
    　前記ジョイントは、ジョイント円環形状部を備え、
    　前記ジョイント円環形状部は、前記内管と同心円状の前記内管の中心軸と交差する円環板状の形状を有し、前記ジョイント取付部の他端と、前記熱膨張差吸収手段とに接続されている請求項１～３のいずれか一項に記載の太陽熱集熱管。     The outer tube and the thermal expansion difference absorbing means are connected via a joint mounting portion and a joint,
    The joint mounting portion has a cylindrical shape concentric with the outer tube, and one end is connected to the outer tube,
    The joint includes a joint annular shape portion,
    The joint annular shape portion has an annular plate shape that intersects the central axis of the inner tube that is concentric with the inner tube, the other end of the joint mounting portion, the thermal expansion difference absorbing means, The solar heat collecting tube according to any one of claims 1 to 3, wherein the solar heat collecting tube is connected to the solar heat collecting tube.
  5. 　前記外管と、前記熱膨張差吸収手段とが、ジョイント取付部と、ジョイントとを介して接続され、
    　前記ジョイント取付部は、前記外管と同心円状の円筒形状を有し、一端が前記外管に接続され、
    　前記ジョイントは、ジョイント最外部と、ジョイント円筒形状部と、ジョイント円環形状部とを備え、
    　前記ジョイント最外部は、前記内管と同心円状の前記内管の中心軸と交差する円環板状の形状を有し、前記ジョイント取付部の他端に接続され、
    　前記ジョイント円筒形状部は、前記内管と同心円状の円筒形状を有し、前記熱膨張差吸収手段を取り囲むように設けられており、前記内管の中心軸方向に対して少なくとも前記ジョイント取付部と同じ長さを持ち、一端が前記ジョイント最外部に接続され、
    　前記ジョイント円環形状部は、前記内管と同心円状の前記内管の中心軸と交差する円環板状の形状を有し、前記ジョイント円筒形状部の他端と、前記熱膨張差吸収手段とに接続されている請求項１～３のいずれか一項に記載の太陽熱集熱管。     The outer tube and the thermal expansion difference absorbing means are connected via a joint mounting portion and a joint,
    The joint mounting portion has a cylindrical shape concentric with the outer tube, and one end is connected to the outer tube,
    The joint includes a joint outermost part, a joint cylindrical part, and a joint annular part.
    The outermost joint has an annular plate shape that intersects the central axis of the inner tube concentric with the inner tube, and is connected to the other end of the joint mounting portion.
    The joint cylindrical portion has a cylindrical shape concentric with the inner tube, is provided so as to surround the thermal expansion difference absorbing means, and at least the joint mounting portion with respect to the central axis direction of the inner tube Have one end connected to the outermost part of the joint,
    The joint annular shape portion has an annular plate shape that intersects the central axis of the inner tube concentric with the inner tube, the other end of the joint cylindrical shape portion, and the thermal expansion difference absorbing means The solar heat collecting tube according to any one of claims 1 to 3, wherein the solar heat collecting tube is connected to the solar heat collecting tube.
PCT/JP2015/069644 2014-07-28 2015-07-08 Solar heat collecting tube WO2016017384A1 (en)

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JP2004251612A (en) * 2002-07-08 2004-09-09 Carl-Zeiss-Stiftung Absorber pipe for solar heating
US20120272950A1 (en) * 2009-11-12 2012-11-01 Abengoa Solar New Technologies, S.A. Insulating element for expansion compensation device and method for the manufacture thereof
JP2013508670A (en) * 2009-10-27 2013-03-07 ショット・ゾラール・アーゲー Absorption tube and method for reversibly loading and unloading free hydrogen to or from getter material
WO2014002643A1 (en) * 2012-06-27 2014-01-03 株式会社 豊田自動織機 Solar-heat collection tube

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JP2008025778A (en) * 2006-07-25 2008-02-07 Kinugawa Rubber Ind Co Ltd Constant velocity joint boot

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JP2004251612A (en) * 2002-07-08 2004-09-09 Carl-Zeiss-Stiftung Absorber pipe for solar heating
JP2013508670A (en) * 2009-10-27 2013-03-07 ショット・ゾラール・アーゲー Absorption tube and method for reversibly loading and unloading free hydrogen to or from getter material
US20120272950A1 (en) * 2009-11-12 2012-11-01 Abengoa Solar New Technologies, S.A. Insulating element for expansion compensation device and method for the manufacture thereof
WO2014002643A1 (en) * 2012-06-27 2014-01-03 株式会社 豊田自動織機 Solar-heat collection tube

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