JP4979094B2 - Solar concentrator - Google Patents

Description

  The present invention relates to a solar light collecting device, and more particularly to a light collecting device of a CPC (Compound Parabolic Concentrator) that is a solar heat collecting device.

  Conventionally, many devices using sunlight have been developed. For example, CPC (Compound Parabolic Concentrator) is one of them. This is a light collector (reflector) composed of a parabolic part and an involute curved part directly under a heat collecting tube having a selective absorption film. It is known that the arrangement effectively collects light rays within an angle θ depending on the aperture width without tracking the sun (see, for example, Patent Document 1).

  Further, the light collecting plate (reflecting plate) has a compound paraboloid (parabolic shape portion and involute curve shape portion) at its side surface, and the bottom surface portion is a flat or flat combination, or a pair of compound paraboloids. Are known in the shape of a combination of planes that approximate the outer composite paraboloid between the bottoms of each other (see, for example, Patent Document 2).

  In addition, as a structure for installing two light collecting plates (reflecting plates) having a composite parabolic surface, two attachment receiving surfaces formed in a substantially W shape, each formed on the composite parabolic surface, and the both attachments There has been known one using a base made up of intersecting ridges whose receiving surfaces intersect in the width direction and formed at a low position (see, for example, Patent Document 3).

  According to the device described in Patent Document 3, the outer locking portions formed at both ends in the width direction of the base and the inner locking portions formed at both ends in the width direction of the intersecting ridges are gathered respectively. Both ends of the light plate (reflecting plate) in the width direction can be inserted and fixed.

JP 2008-138899 A JP 2001-221514 A JP 2002-106975 A

  In the light converging structure having the compound paraboloid described in Patent Documents 1, 2, and 3, the light collecting plate (reflecting plate) is used for sunlight rays within the range of the light receiving angle θ depending on the opening width of the light converging plate (reflecting plate). ) To the heat collecting tube.

  However, when the heat collecting tube and the light collecting plate are in contact with each other, there is a problem that a heat radiation loss due to heat conduction from the heat collecting tube to the light collecting plate occurs, and the amount of heat transfer to the heat medium in the heat collecting tube is reduced.

  In addition, since the heat stored in the heat collection tube is dissipated to the atmosphere by air convection, a contrivance to reduce the convective heat loss from this heat collection tube to the surrounding area is made especially by making the circumference of the heat collection tube a vacuum structure. Has been tried. Specifically, the heat collecting tube is generally covered with a vacuum glass tube, etc., and a vacuum structure is provided. However, the vacuum glass tube and the light collecting plate are disposed between the vacuum glass tube and the light collecting plate because of conduction heat loss. Therefore, it is necessary to provide a space, and the distance between the heat collecting tube and the light collecting plate tends to be larger.

  However, the space provided between the heat collecting tube and the light collecting plate causes a problem of reducing the light collecting accuracy from the light collecting plate to the heat collecting tube. In other words, due to the space, some of the sunlight rays reflected from the light collecting plate did not reach the heat collecting tube, causing a problem of attenuation of light energy at the light collecting stage.

  In addition, in order to improve the light collection accuracy of the light collector itself, the light receiving surface (reflective surface) of the light collector is formed into an ideal composite paraboloid (parabolic portion and involute curve portion) in a W shape. In order to incorporate it into the frame member of the apparatus while maintaining the shape of the light collecting plate formed in this way, careful attention is required, and there are problems such as increased labor and cost for assembly. It was.

  The present invention has been made by the inventors and others in earnest research in view of the above circumstances. Even if a space is provided between the heat collecting tube and the light collecting plate, the light collecting accuracy (to the heat collecting tube of the solar rays reflected from the light collecting plate) The solar light collecting device is provided which can improve the degree of (reachability) and can be easily assembled.

  In order to solve the above-mentioned problems, the present invention is a solar concentrator that warms a heat medium that circulates in a heat collection tube by concentrating solar light incident near the heat collection tube on the heat collection tube. A light collecting frame member provided along the heat pipe, having a concave fitting portion at the center, and having a mounting surface formed on both sides symmetrical and W-shaped composite paraboloid, and a composite parabolic curve And two wedge-shaped connecting members that are fitted into the concave fitting portions and sandwich the inner end portions of the two light collecting plates with the light collecting frame member. A concave-convex shape portion is formed on the light-receiving surface of the wedge-shaped connecting member to reduce a reflection angle with respect to an incident angle of light incident on the light-receiving surface. In this case, if the uneven portion formed on the light receiving surface of the wedge-shaped connecting member has a shape that reduces the reflection angle with respect to the incident angle of the light incident on the light receiving surface, the light receiving surface is formed into a rough surface. However, it is preferable to form the concavo-convex shape portion in a triangular wave shape in the cross-section and to form it in the longitudinal direction of the heat collecting tube. In this case, the light receiving surface of the wedge-shaped connecting member may be flat or may be a gentle concave shape.

  By configuring in this way, the wedge-shaped connecting member is fitted to the concave fitting portion of the light collecting frame member to sandwich the light collecting plate, so that the compound parabolic curved light collecting plate is attached to the mounting surface of the light collecting frame member. Can be attached. Moreover, since the reflection angle with respect to the incident angle of the sunlight ray to the light-receiving surface of the wedge-shaped connecting member becomes small, it is possible to increase the ratio of the sunlight rays that have reflected from the light-receiving surface to reach the heat collecting tube.

  In the present invention, it is preferable that the light receiving surface of the wedge-shaped connecting member is subjected to a brightening treatment or white coating (for example, electrodeposition coating). In this case, for example, the bright treatment can be performed by chemical polishing, electrolytic polishing, or the like.

  By comprising in this way, the reflectance of the light-receiving surface of a wedge-shaped connection member can be enlarged.

  Moreover, in this invention, it is better to form the outer locking groove part which inserts the outer side edge part of the said light-condensing plate in the both ends of the width direction of the said light-condensing frame member.

  By comprising in this way, the outer side edge part of the light-condensing plate by which the inner side edge part was clamped with the condensing frame member and the wedge-shaped connection member can be hold | maintained by the outer side locking groove formed in the condensing frame member. it can.

  Further, in the present invention, a concave locking receiving portion is formed on both sides of the bottom of the concave fitting portion provided in the light collecting frame member, and the wedge-shaped connecting member has a pair of side pieces on both sides of the light receiving side piece. In addition to forming a U-shaped cross section, a pressing wing piece is formed on both sides of the light receiving side piece to hold the inner end of the light collector, and the tip of each side piece is engaged with the concave locking receiving part. It is preferable to adopt a structure in which a possible locking claw portion is provided.

  With this configuration, a wedge-shaped connection is achieved in a state where the concave locking receiving portion provided in the concave fitting portion is engaged with the locking claw portion provided on the side piece of the wedge-shaped connecting member. The light guide plate can be clamped and held by fitting the member into the concave fitting portion.

  Moreover, in this invention, it is more preferable to form the said condensing frame member and a wedge-shaped connection member with the extruded shape member made from aluminum.

  By configuring in this way, the dimensional accuracy of the condensing frame member and the wedge-shaped connecting member can be increased. Therefore, even when the condensing frame member and the wedge-shaped connecting member are long in the longitudinal direction, Springback and bending deformation can be prevented. Further, it is possible to facilitate the assembly and disassembly of the light collecting plate to the light collecting frame member, and to obtain the advantage of recyclability.

  In addition, in this invention, it further comprises a side frame member disposed at an end of the light collecting frame member and the wedge-shaped connecting member, and faces the light collecting frame member and the wedge-shaped connecting member of the side frame member. A locking holding portion that engages with the end portion of the light collecting frame member, the wedge-shaped connecting member, and the light collecting plate may be formed on the surface to be formed. In this case, as the above-mentioned locking holding portion, for example, a plurality of projections that engage with the end portions of the light collecting frame member, the wedge-shaped connecting member and the light collecting plate, or the light collecting frame member, the wedge-shaped connecting member, and the light collecting plate It can be formed by a groove edged in the shape of the end.

  By comprising in this way, the condensing frame member, a wedge-shaped connection member, and the condensing plate whole holding | maintenance can be ensured.

  According to this invention, since it is configured as described above, the following remarkable effects can be obtained.

  A composite formed on the condensing frame member by fitting a wedge-shaped connecting member to a concave fitting portion formed at the center of the condensing frame member and sandwiching two composite parabolic curved condensing plates A compound parabolic curved light collector can be easily mounted on a parabolic curved mounting surface.

  In addition, the unevenness formed on the light receiving surface of the wedge-shaped connecting member reduces the reflection angle with respect to the incident angle of sunlight on the light receiving surface. Can be bigger. Therefore, even if a space is provided between the heat collecting tube and the light collecting plate, it is possible to improve the light collecting accuracy (the degree of arrival of sunlight reflected from the light collecting plate to the heat collecting tube).

It is a schematic perspective view which shows the sunlight condensing device which concerns on this invention. It is a perspective view which shows the principal part of the said sunlight condensing device. It is sectional drawing (a) which shows the principal part of the said sunlight condensing device, I part enlarged view (b) of (a), and II part enlarged view (c) of (a). It is a schematic side view which shows the reflection angle in case the sunlight ray in the light-shielding plate and wedge-shaped connection member in this invention is incident angle 0 degree. It is a schematic side view which shows the reflection angle when the sunlight in the light-shielding plate and wedge-shaped connecting member in this invention is an incident angle of 10 degrees. It is a schematic side view which shows the reflection angle in case the sunlight ray in the light-shielding plate and wedge-shaped connection member in this invention is an incident angle of 20 degrees. It is a schematic side view which shows the reflection angle in case the sunlight ray in the light-shielding plate and wedge-shaped connection member in this invention is an incident angle of 30 degrees. It is the perspective view (a) which shows the wedge-shaped connection member in this invention, and the front view (b) which shows an end surface. It is a schematic perspective view which shows the different form of the latching holding part provided in the side frame member in this invention. It is explanatory drawing which shows the state of the incident angle from which the sunlight ray in the light-condensing plate of the comparative example 1 differs. It is explanatory drawing which shows the state of the incident angle from which the sunlight ray in the light-condensing plate of the comparative example 2 differs. It is explanatory drawing which shows the state of the incident angle from which the sunlight ray in the light-condensing plate of the comparative example 3 differs. It is explanatory drawing which shows the state of the incident angle from which the sunlight rays differ in the light-condensing plate of the Example of this invention.

  Hereinafter, embodiments of a solar light collecting device according to the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, the solar light collecting device according to the present invention has a rectangular cylindrical main frame 2 into which a water supply pipe 4 and a hot water supply pipe 5 are inserted, and a lower portion of one side wall of the main frame 2. A plurality of base plates 1 arranged in parallel above the base plate 3 via a main body 1 composed of a rectangular base plate 3 extending outward from the side frame member 6 provided along a side wall portion of the main frame 2. A heat collecting tube 7 and a condensing frame member 10 disposed below each heat collecting tube 7 are attached to the heat collecting tube 7 by a wedge-shaped connecting member 20, and reflect sunlight rays that enter the vicinity of the heat collecting tube to concentrate on the heat collecting tube 7. Two light collecting plates 30 are provided.

  The concentrating frame member 10 is formed of an extruded shape made of aluminum (including an aluminum alloy), has a concave fitting portion 11 having a U-shaped cross section at the center, and both sides are symmetrical and It has a mounting surface 12 formed on a W-shaped compound paraboloid. The compound paraboloid that forms the mounting surface 12 is a combination of an involute curve and a parabolic curve (CPC curve) that collects light within the range of the light receiving angle θ, The shape reflects the heat collecting tube 7 most efficiently.

  On both sides of the bottom of the concave fitting portion 11, a concave locking receiving portion 13 having a locking flat surface 13a at the upper end is formed. A narrow opening-shaped screw pocket 14 is formed at the center of the back surface of the concave fitting portion 11. In addition, outer locking grooves 15 into which outer end portions of the light collector 30 are inserted are formed at both ends in the width direction of the light collector frame member 10. In this case, the outer locking groove portion 15 includes a concave groove 15a that is bent outward from the upper end of the mounting surface 12, and a light collecting plate pressing piece 15b that is bent from the upper end of the concave groove 15a toward the mounting surface 12 side.

  As shown in FIG. 5, the wedge-shaped connecting member 20 is formed of an extruded shape made of aluminum (including an aluminum alloy), and has a cross-sectional core having a pair of side pieces 22 on both sides of the light receiving side piece 21. A pressing wing piece 23 is formed on both sides of the light receiving side piece 21 and presses the inner end of the light collector 30, and is engaged with the concave locking receiving portion 13 at the tip of the side piece 22. Possible latching claw portions 24 are projected.

  Furthermore, the surface of the light-receiving side piece 21 of the wedge-shaped connecting member 20, that is, the light-receiving surface, is formed with an uneven portion 25 that reduces the reflection angle with respect to the incident angle of the light incident on the light-receiving surface. In this case, the concavo-convex shape portion 25 has a triangular cross-sectional shape and is formed in the longitudinal direction of the heat collecting tube 7 (see FIGS. 2, 3, and 5).

  Further, the light receiving surface is subjected to a glittering treatment or white coating. In this case, when the wedge-shaped connecting member 20 is made of an aluminum alloy such as 6000 series, white electrodeposition coating is possible. The treatment method is an existing technique. After pretreatment such as degreasing and etching, an anodized film is formed, and then an acrylic / melamine resin emulsion containing a white color pigment is electrophoresed on the film. Paint and bake and harden. The film thickness is preferably 10 to 100 μm. The reason is that when the film thickness is larger than 100 μm, the uneven surface of the uneven portion 25 on the light receiving surface of the wedge-shaped connecting member 20 is flattened, and when the film thickness is less than 10 μm, the wedge-shaped connecting member 20. This is because the reflectance of the base material is reflected on the light receiving surface. If a 6000 series aluminum alloy is used, it will become a member excellent in both strength and cost.

  In addition, when the wedge-shaped connecting member 20 uses high-purity aluminum such as 1000 series, the reflectance of the light-receiving surface of the wedge-shaped connecting member 20 can be increased through bright processing by chemical polishing or electrolytic polishing. It becomes possible.

  The condensing plate 30 is formed of, for example, a bright reflecting aluminum plate having a thickness of 0.3 mm, and each is formed on a composite parabolic surface similar to the mounting surface 12 of the condensing frame member 10.

  The two light collecting plates 30 formed as described above are attached to the light collecting frame member 10 in the following procedure. First, the outer end of each light collector 30 is placed on the mounting surface 12 in a state where the outer end is inserted into the outer locking groove 15 of the light collector frame member 10. Next, the wedge-shaped connecting member 20 is fitted into the concave fitting portion 11 of the light condensing frame member 10, and the pressing blade piece 23 of the wedge-shaped connecting member 20 and the concave fitting portion 11 of the light collecting frame member 10 are fitted. The inner end of the light collector 30 is sandwiched between the mounting surface 12 in the vicinity. In this state, the locking claw portion 24 provided at the tip of the side piece 22 of the wedge-shaped connecting member 20 engages (fits) with the concave locking receiving portion 13 of the concave fitting portion 11, and the light collector 30 Is prevented from being bent and deformed by the spring back.

  In order to further suppress the bending deformation due to the spring back of the light collecting plate 30 attached to the light collecting frame member 10, the surface of the side frame member 6 facing the light collecting frame member 10 and the wedge-shaped connecting member 20 is collected. You may form the latching holding part 40 engaged with the edge part of the optical frame member 10, the wedge-shaped connection member 20, and the light-condensing plate 30. FIG. In this case, the locking holding portion 40 can be formed by a plurality of protrusions 41 that engage with the light collecting frame member 10, the wedge-shaped connecting member 20, and the light collecting plate 30 (see FIG. 6A). ). Further, in place of the plurality of protrusions 41, the locking holding portion 40 may be formed by a groove portion 42 which is edged in the shape of the end portions of the light collecting frame member 10, the wedge-shaped connecting member 20 and the light collecting plate 30 ( (Refer FIG.6 (b)).

  However, in this case, it is preferable to perform a process of filling a gap such as the groove 42 so as not to deteriorate the heat insulating property in the main frame 2.

  On the other hand, a heat transfer pipe (not shown) connected to the water supply pipe 4 and the hot water supply pipe 5 inserted into the main frame 2 is inserted into the heat collecting pipe 7. The heat collecting tube 7 is inserted into a glass vacuum outer tube 8 through a vacuum layer. A base end portion of the heat collecting tube 7 inserted into the vacuum outer tube 8 is attached to a side wall of the main frame 2 through a mounting hole 6 a formed in the side frame member 6 together with the vacuum outer tube 8. (See FIG. 6). Further, the tips of the heat collecting tube 7 and the vacuum outer tube 8 are held by a holding cap 9 attached to the base plate 3.

  According to the concentrating device of the embodiment configured as described above, the wedge-shaped connecting member 20 can be fitted to the concave fitting portion 11 of the condensing frame member 10 so that the light collecting plate 30 can be sandwiched. The concentric parabolic condensing plate 30 can be easily and reliably attached to the attachment surface 12 of the condensing frame member 10.

  Moreover, since the uneven | corrugated shaped part 25 (for example, triangular wave shape) which makes the reflection angle with respect to the incident angle of a sunlight ray small is formed in the light-receiving surface of the wedge-shaped connection member 20, the sunlight ray reflected from the light-receiving surface 31 of the light-condensing plate 30 The ratio of reaching the heat collecting tube 7 can be increased. That is, as shown in FIG. 4A, when the light receiving angle θ = 0 ° is taken as an example, the sunlight R entering the outer region T30 of the light receiving surface 31 of the light collector 30 is reflected by the light receiving surface 31. The reflection angle of the light beam applied to the light receiving surface of the wedge-shaped connecting member 20 can be reduced by the uneven portion 25 (triangular wave shape) to reach the heat collecting tube 7. Thereby, the ratio which reaches | attains the heat collecting tube 7 among the sunlight rays reflected from the light-receiving surface 31 of the light-condensing plate 30 can be enlarged.

  In FIG. 4A, the sunlight R entering the central region T10 directly enters (irradiates) the heat collecting tube 7 and enters the intermediate region T20 between the central region T10 and the outer region T3. The sunlight R enters the light receiving surface 31 of the light collector 30 and is reflected, and is incident (irradiated) on the heat collecting tube 7.

  When the light receiving angle θ = 10 °, as shown in FIG. 4B, the sunlight R entering the outer region T31 on the inclined side (right side in the drawing) of the light receiving surface 31 of the light collector 30 is received by the light receiving surface 31. The reflection angle of the light beam reflected on the light receiving surface of the wedge-shaped connecting member 20 can be reduced by the uneven portion 25 (triangular wave shape) to reach the heat collecting tube 7.

  Note that the sunlight R entering the central region T11 moves to the inclined side (right side in the figure) compared to when the light receiving angle θ = 0 °, and directly enters (irradiates) the heat collecting tube 7 to enter the central region. The sunlight R entering the intermediate region T21a between T11 and the outer region T31 and the region T21b opposite to the intermediate region T21a with respect to the heat collecting tube 7 enters the light receiving surface 31 of the light collector 30. And is incident (irradiated) on the heat collecting tube 7.

  Further, when the light receiving angle θ = 20 ° and the light receiving angle θ = 30 °, as shown in FIGS. 4C and 4D, the outer region T32 on the inclined side (right side in the drawing) of the light receiving surface 31 of the light collector plate 30, respectively. The solar ray R incident on T33 is reflected on the light receiving surface 31 and the reflection angle of the light beam irradiated on the light receiving surface of the wedge-shaped connecting member 20 is reduced by the concave / convex shape portion 25 (triangular wave shape). Can be reached.

  Note that the sunlight R entering the central regions T12 and T13 moves further to the inclined side (right side in the figure) than when the light receiving angle θ = 0 ° and the light receiving angle θ = 10 °, and directly the heat collecting tube 7 To the intermediate regions T22a and T23a between the central regions T12 and T13 and the outer regions T32 and T33, and the regions T22b and T23b opposite to the intermediate regions T22a and T23a with respect to the heat collecting tube 7. The incident sunlight R enters the light receiving surface 31 of the light collector 30 and is reflected, and is incident (irradiated) on the heat collecting tube 7.

  Next, in order to investigate the light collecting accuracy of the light collecting device according to the present invention, the comparative examples 1, 2, and 3 having different shapes immediately below the heat collecting tube 7 in the light collecting plate 30 and implementation of the light collecting device according to the present invention An experiment comparing the example will be described.

A. Condensing plate design <Involute curve and CPC curve locus>
The center of the heat collecting tube 7 is the origin,
Heat collection tube radius: Ra
Maximum allowable half-width: θmax
Vacuum outer tube radius: R0
Then,
The shape of the light collector is composed of the following two parts depending on the region of the central angle θ.

(i) Involute curve part (θ ≦ π / 2 + θmax)
(ii) CPC curve part (π / 2 + θmax <θ ≦ 3π / 2−θmax)
It is well known that the (X, Y) coordinates forming the light collecting plate shape at this time are both determined by the equations (1) and (2).

X = Ra (sinθ−ρcosθ) (1)
Y = −Ra (cosθ−ρsinθ) (2)
However, ρ = θ in (i),
(ii) ρ = {π / 2 + θmax + θ−cos (θ−θmax)} / {1 + sin (θ−θmax)}
In this implementation,
Ra = 18 mm, allowable half angle θmax = 34 °, R0 = 23.5 mm,
The distance between the vacuum outer tube 8 and the wedge-shaped connecting member 20 is 2.0 mm,
The allowable half angle θmax is an index indicating a range in which sunlight rays incident on the light collecting structure are counted. That is, the allowable half angle θmax, which is the maximum acceptance half angle determined by the opening width of the light collector 30, is designed to receive sunlight from 9:00 to 15:30 in each season.

<Prerequisites>
Installation location: Sugawara, Shizuoka City, Shizuoka Prefecture (latitude 35 degrees, east longitude 138.6 degrees)
In the area of the ground angle of the light collecting device: 45 degrees, the sunlight rays incident from 9 o'clock to 15:30 were counted at the spring equinox, summer solstice, autumn equinox, and winter solstice.

From Table 1 above, the difference between the annual maximum south-middle altitude and the minimum incident angle in the region is
78.8 ° -10.8 ° = 68.0 °,
The range of the full incident angle (2θmax) is 68.0 °.

B. Condensing accuracy Next, a comparison of the condensing accuracy of Comparative Examples 1, 2, and 3 and the example of the present invention will be described under the above conditions.

<Comparative Example 1>
A portion immediately below the heat collecting tube 7 of the light collector 30A is brought close to the heat collecting tube 7 (see FIG. 7).
<Comparative example 2>
Immediately below the heat collecting tube 7 of the light collector 30B is made flat (see FIG. 8).
<Comparative Example 3>
The light receiving surface immediately below the heat collecting tube 7 of the connecting member 20C that connects the two light collecting plates 30C is not roughened (see FIG. 9).
<Example>
Condensing frame member 10: 6063 alloy Wedge-shaped connection member 20: 6063 alloy Width of light receiving surface (uneven shape portion 25) of wedge-shaped connection member 20: 12 mm, uneven angle: 135 ° (see FIG. 5B)
Light collecting plate 30: 0.3t-bright reflecting plate In the light collecting structures of Comparative Examples 1, 2, and 3 and the embodiment of the present invention configured as described above, the light receiving angles are 0 °, 5 °, 10 °, When the light collection accuracy for each of 15 °, 20 °, 23 °, 30 ° and 33 ° was 1.00, the relative light collection accuracy was compared, and the results shown in Table 2 were obtained. Note that the refractive index of the glass of the vacuum outer tube 8 is not considered.

  As can be seen from Table 2 above, Comparative Example 1 had an average light collection accuracy of 0.90, Comparative Example 2 had an average light collection accuracy of 0.89, and Comparative Example 3 had an average light collection accuracy of 0.92. The average light collection accuracy of the example was 0.94.

6 side frame member 7 heat collecting tube 10 light collecting frame member 11 concave fitting portion 12 mounting surface 13 concave locking receiving portion 15 outer locking groove portion 20 wedge-shaped connecting member 21 light receiving side piece 22 side piece 23 pressing blade piece 24 locking Claw part 25 Uneven shape part 30 Light collecting plate 31 Light receiving surface 40 Locking holding part

Claims (7)

A solar concentrator that heats a heat medium that circulates in the heat collection tube by concentrating solar rays that enter the vicinity of the heat collection tube on the heat collection tube,
A light collecting frame member provided along the heat collecting tube, having a concave fitting portion in the central portion, and having mounting surfaces formed on left and right symmetrical and W-shaped compound paraboloids;
Two concentric parabolic condensing plates,
A wedge-shaped connecting member that is fitted to the concave fitting portion, and sandwiches the inner end portions of the two light collecting plates with the light collecting frame member,
On the light receiving surface of the wedge-shaped connecting member, an uneven shape portion is formed to reduce the reflection angle with respect to the incident angle of the light incident on the light receiving surface.
The solar condensing device characterized by the above. The solar light collecting device according to claim 1,
The solar light concentrating device, wherein the uneven portion formed on the light receiving surface of the wedge-shaped connecting member has a triangular cross-sectional shape and is formed in a longitudinal direction of the heat collecting tube. In the sunlight condensing device according to claim 1 or 2,
A sunlight condensing device, wherein the light receiving surface of the wedge-shaped connecting member is subjected to a brightening treatment or a white coating. In the solar condensing device according to any one of claims 1 to 3,
The solar light concentrating device, wherein outer locking groove portions for inserting outer end portions of the light collector plate are formed at both ends in the width direction of the light collector frame member. In the solar condensing device according to any one of claims 1 to 4,
A concave latch receiving portion is formed on both sides of the bottom of the concave fitting portion,
The wedge-shaped connecting member is formed in a U-shaped cross-section having a pair of side pieces on both sides of the light receiving side piece, and a pressing blade piece for holding the inner end of the light collector on both sides of the light receiving side piece. A locking claw portion that is formed and engages with the concave locking receiving portion protrudes from the tip of the both side pieces.
The solar condensing device characterized by the above. In the solar condensing device according to any one of claims 1 to 5,
The solar light concentrator, wherein the condensing frame member and the wedge-shaped connecting member are formed of an aluminum extruded shape. In the solar condensing device according to any one of claims 1 to 6,
The light collecting frame member and the wedge-shaped connecting member further include a side frame member disposed on an end of the light collecting frame member and the wedge-shaped connecting member. A solar light condensing device, characterized in that a frame member, a wedge-shaped connecting member, and an engaging holding portion that engages with an end portion of the light collecting plate are formed.

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