JP2013029537A - Concentrator and concentration apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentrator capable of reducing the weight and a concentration apparatus including the same.SOLUTION: A trough-type concentrator 4 having a reflecting part 3 for concentrating solar beam to a linearly extending receiver 2 includes: a base 9 of resin on which the reflecting part 3 is disposed; a metal torque tube 10 which extends along the receiver 2 and is provided to the base 9 at the opposite side of the reflecting part 3; and plural metal ribs 11 extending along the base 9 in a direction crossing the torque tube 10 fixed to the base 9 and the torque tube 10. The base 9 has plural reinforcement rib-faces A having a polygonal grid shape at the opposite side of the reflecting part 3.

Description

  The present invention relates to a reflective concentrator that collects sunlight and a condensing device including the same.

  In recent years, the use of sunlight, which is renewable natural energy, has been widely studied. For the use of sunlight, a method of directly converting to sunlight by a solar cell and a method of absorbing sunlight and using it as solar heat are known. Since the use of solar heat does not use semiconductors, the initial investment can be kept lower than that of solar cells. For this reason, development of the condensing device which can obtain solar heat efficiently is carried out in the world.

  Known concentrators include trough, tower, dish, and Fresnel types. Here, the trough type will be described. The trough-type condensing device includes a bowl-shaped concentrator that condenses light on a linear receiver, and a drive mechanism that changes the direction of the concentrator in accordance with the movement of the sun. In the trough-type condensing device, the heat transport fluid flows inside the tubular receiver, and the heat obtained by the receiver by condensing is transported by the heat transport fluid, so that solar heat is used.

  As a concentrator provided in the trough-type condensing device, a configuration in which a glass mirror that reflects sunlight is supported by a metal structure is known (for example, see Patent Documents 1 and 2). Patent Document 1 discloses a light collector that supports a glass mirror by a structure that is a framework of a metal square pipe.

JP 59-23302 JP 2007-162671 A

  By the way, the concentrator of the trough-type condensing device needs to have sufficient strength so as not to be deformed even under strong wind. On the other hand, if the number of members of the structure of the concentrator is increased or the thickness is increased in order to increase the strength, the manufacturing cost of the concentrator is improved and the weight is also increased. An increase in the weight of the concentrator leads to an increase in the size of the drive mechanism, leading to an increase in manufacturing cost of the entire apparatus. For this reason, the weight reduction of a collector is strongly calculated | required.

  Therefore, an object of the present invention is to provide a concentrator that can be reduced in weight and a condensing device including the same.

  In order to solve the above-mentioned problems, the present invention is a trough-type concentrator having a reflecting portion that condenses a linearly extending receiver, and a resin base material on which the reflecting portion is disposed; A metal torsion load receiving member provided on the opposite side of the reflecting portion with respect to the base material and extending along the receiver; and extending along the base material in a direction intersecting the torsion load receiving member; And a bending load receiving member fixed to the torsional load receiving member, and the base material is provided with a polygonal lattice-shaped reinforcing rib surface on the side opposite to the reflecting portion.

  According to this concentrator, by adopting a resin base material, it is possible to achieve a significant weight reduction as compared with a metal case. In addition, by providing a polygonal lattice-shaped reinforcing rib surface on the resin base material, it is possible to ensure sufficient strength while suppressing the amount of resin used. Furthermore, the load received by the collector due to wind or the like is efficiently shared by the torsional load receiving member and the bending load receiving member, so that the structure of the collector is simplified and the weight is reduced. The strength of the vessel can be ensured. Moreover, since the torsional load receiving member and the bending load receiving member are provided, the strength burden on the base material can be reduced, so that the base material can be made thinner and lighter. Therefore, according to this concentrator, a significant weight reduction can be achieved as compared with the conventional product.

In the said collector, the bending load receiving member may reach the both ends of a base material in the extension direction of the said bending load receiving member.
According to this concentrator, since the bending load receiving member reaches the end of the base material, even if a load is applied to the end of the base material by wind or the like, the bending load receiving member can receive the load, Durability can be improved.

In the concentrator, the reflection part may be a film mirror.
According to this concentrator, by adopting a film mirror for the reflecting portion, it is possible to significantly reduce the weight as compared with the case of using a glass mirror. Moreover, according to this concentrator, since the glass bending process which was the cause of the increase in manufacturing cost becomes unnecessary, the manufacturing cost of the concentrator can be reduced.

In the above concentrator, the reflecting portion may be a thin glass mirror having a thickness of 0.03 mm to 1 mm.
According to this concentrator, since it is not necessary to give strength to the reflecting portion, it is possible to reduce the weight of the concentrator by adopting a thin glass mirror having a thickness of 0.03 mm to 1 mm.

In the concentrator, the base material may be formed by injection molding or compression molding.
In this case, since the base material having the reinforcing rib surface can be obtained in one process, the production efficiency can be increased, which is advantageous for mass production.

In the concentrator, the base material may be made of any material of acrylic, polycarbonate, polymethyl, methacrylate, styrene, and polystyrene.
According to this concentrator, the lifetime of the concentrator can be improved by forming the base material with a resin having high resistance to sunlight (particularly ultraviolet rays).

In the above concentrator, a ventilation slit that passes from the front side of the reflection part to the opposite side of the reflection part in the base material may be formed in the reflection part and the base material.
According to this concentrator, since the wind blown to the concentrator can be passed by the ventilation slit, the load applied to the concentrator by the wind can be greatly reduced. Therefore, according to this concentrator, since durability against wind can be improved, the life of the concentrator can be improved.

The condensing apparatus which concerns on this invention is provided with one of the said concentrators, and the drive mechanism which changes the direction of the said concentrator according to a motion of the sun, It is characterized by the above-mentioned.
According to this condensing device, since the concentrator can be significantly reduced in weight, the entire device can be reduced in weight. Therefore, according to this condensing device, since the output required for the driving mechanism is reduced by reducing the weight of the concentrator, the driving mechanism can be made small, and the manufacturing cost of the device can be reduced. it can.

  According to the present invention, the weight can be reduced.

It is a perspective view which shows the condensing apparatus which concerns on 1st Embodiment. It is a side view which shows the condensing apparatus of FIG. It is the perspective view which looked at the concentrator of FIG. 1 from the front side. It is the perspective view which looked at the concentrator of FIG. 1 from the back side. It is a perspective view which shows the collector of the condensing apparatus which concerns on 2nd Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
As shown in FIG. 1, the light concentrator 1 according to the first embodiment includes a receiver 2 that extends linearly and a bowl-shaped reflector 3 that condenses the receiver 2. 4 is a trough-type condensing device. In FIG. 1, two condensers 4 arranged in a row are illustrated and described. Each concentrator 4 has one receiver 2, and these receivers 2 are connected by a receiver support member 5 that functions as a joint.

  In the trough-type condensing device 1, the heat transport fluid flows inside the tube-shaped receiver 2, and the heat obtained by the receiver 2 by the condensing of the concentrator 4 is transported by the heat transport fluid and used as solar heat. The Solar heat is used, for example, for steam power generation, hot water supply, steam supply, heating air conditioning, cooling air conditioning (high-temperature heat source of absorption chiller), and the like. The receiver 2 is fixed to the condenser 4 via the receiver support member 5.

  As shown in FIGS. 1 and 2, the light collecting device 1 includes a support base 6 that rotatably supports the light collector 4, and a drive mechanism 7 that changes the direction of the light collector 4 in accordance with the movement of the sun. It is equipped with. The support bases 6 are disposed on the left and right sides of the condenser 4 and support the condenser 4 so as to be rotatable about a horizontal axis parallel to the receiver 2.

  The drive mechanism 7 is provided between the support base 6 and the condenser 4 and rotates the condenser 4. An example of the rotated condenser 4 is shown by a one-dot chain line in FIG. The drive mechanism 7 can employ actuators of various mechanisms such as an electric type and a hydraulic type. The drive mechanism 7 does not necessarily need to rotate the condenser 4 360 degrees, and may be configured to swing at less than 360 degrees. Further, it is not necessary to provide the drive mechanism 7 on all the support bases 6.

  As shown in FIGS. 3 and 4, the concentrator 4 includes a bowl-shaped reflecting portion 3 that reflects sunlight, a base material 9 on which the reflecting portion 3 is disposed, and a back side of the base material 9 (base material). 9, a torque tube 10 provided on the side opposite to the reflecting portion 3), and a metal rib 11 fixed to the base material 9 and the torque tube 10.

  The reflection part 3 is a film mirror in which a metal film for reflection is formed on a resin film. As a material for the resin film, acrylic, polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, or the like can be used. Moreover, silver, aluminum, etc. can be used as a material of a metal film.

  The reflector 3 is curved in a bowl shape so as to surround the receiver 2 when viewed from the side surface direction of the light collector 1 shown in FIG. Further, a cross section perpendicular to the receiver 2 in the reflecting portion 3 has a parabolic shape with the receiver 2 as a focal point. Note that the reflecting section 3 does not necessarily have a parabolic cross section. The reflecting portion 3 may have a flat portion, or may be a so-called Fresnel type mirror shape.

  The base material 9 is a resin plate-like member on which the reflecting portion 3 is disposed. The base material 9 is curved in a bowl shape so as to surround the linear receiver 2. The base material 9 is made of a material such as acrylic, polycarbonate, polymethyl, methacrylate, styrene, or polystyrene. Since the light concentrator 1 is used in an environment having a strong influence of sunlight, such as a desert region or a dry region, the concentrator is formed by forming the base material 9 from a resin having high resistance to sunlight (particularly ultraviolet rays). 4 can improve the service life.

  Moreover, the base material 9 is comprised from the resin material of the linear expansion coefficient with the resin material of the reflection part 3. FIG. As described above, since the reflecting portion 3 and the base material 9 are formed of a resin material having a close linear expansion coefficient, stress is generated between the reflecting portion 3 and the base material 9 due to thermal deformation accompanying a change in environmental temperature. You can avoid that. This contributes to the improvement of the lifetime of the condenser 4.

  As shown in FIGS. 3 and 4, the base material 9 and the reflecting portion 3 can be divided into 16 mirror units. In the mirror unit, a mirror surface constituting the reflecting portion 3 is formed on the surface of a base material panel constituting the base material 9. The base material 9 and the reflection part 3 are divided into four rows of mirror units when four mirror units arranged in the lateral direction of the base material 9 (the extending direction of the receiver 2) are arranged in one row. FIG. 3 shows the rows 3a to 3d of the mirror surfaces of the four rows of mirror units. FIG. 4 shows the rows 9a to 9d of the base panel of the four rows of mirror units.

  The mirror units are connected to each other in the horizontal direction and the vertical direction. Each mirror unit may be connected only in the lateral direction in consideration of thermal deformation and the like. Each mirror unit is connected so as to be separable from each other.

  Thus, by comprising the base material 9 and the reflecting part 3 from a plurality of mirror units, it is only necessary to replace the damaged mirror unit even if a part of the mirror 9 is damaged. Maintenance of the vessel 4 can be simplified. The number of mirror units is not limited to 16, but is changed according to the size of the condenser 4 and the like. Moreover, the base material 9 and the reflection part 3 do not necessarily need to be comprised from a some mirror unit, and may be comprised from one mirror unit.

  On the back side of the base material 9 (on the side opposite to the reflecting portion 3 with respect to the base material 9), a reinforcing rib surface A having a quadrangular lattice shape is formed. The reinforcing rib surface A is formed on the entire back surface of the base material 9 and is for suppressing the occurrence of bending of the base material 9. The reinforcing rib surface A has a lateral rib 12 extending in the lateral direction of the base material 9 and a longitudinal rib 13 orthogonal to the lateral rib 12. The reinforcing rib surface A of each mirror unit has, for example, five horizontal ribs 12 and three vertical ribs 13. The reinforcing rib surface A includes the back surface of the base material 9 surrounded by the horizontal ribs 12 and the vertical ribs 13.

  Such a base material 9 is formed by injection molding or compression molding. For example, in injection molding, the base material 9 can be formed by injecting a thermoplastic resin heated in a molten state into a mold from an injection machine and then solidifying the thermoplastic resin in the mold.

  Thus, the base material 9 which has the reinforcing rib surface A can be obtained by one process by forming the base material 9 by injection molding or compression molding. As a result, the manufacturing efficiency of the substrate 9 can be increased, which is advantageous for mass production. In addition, the formation method of the base material 9 can employ | adopt various methods other than injection molding or compression molding. For example, the aspect which continuously shape | molds the base material 9 which has the reinforcement rib surface A by high temperature embossing may be sufficient.

  On the back side of the base material 9, a torque tube (twisted load receiving member) 10 and a metal rib (bending load receiving member) 11 are provided in order to ensure the strength of the condenser 4. The torque tube 10 is a metal tubular member extending in the lateral direction along the receiver 2. The torque tube 10 receives a torsional load applied to the light collector 4. The torque tube 10 is connected to the drive mechanism 7 of the support base 6 and is located at the rotation center of the condenser 4. The torque tube 10 does not necessarily have to be the rotation center of the condenser 4.

  The metal rib 11 is an arc-shaped plate member that extends along the reinforcing rib surface A of the substrate 9 in a direction (vertical direction) orthogonal to the torque tube 10. The metal rib 11 receives a vertical bending load applied to the light collector 4. The metal rib 11 is fixed integrally with the base material 9 and the torque tube 10.

  Five metal ribs 11 are arranged with respect to the base material 9, and the torque tube 10 is fixed in a state of passing through the centers of the five metal ribs 11. The two metal ribs 11 positioned at the left and right ends of the base material 9 are bolted with the base material 9 sandwiched therebetween. Further, the metal rib 11 is formed with four holes 11a for weight reduction.

  These metal ribs 11 reach both ends of the base material 9 in the extending direction (vertical direction) of the metal ribs 11. Thus, even if a bending load is added to the edge part of the base material 9 by a wind etc. because the metal rib 11 has reached the edge part of the base material 9, the metal rib 11 can receive a load and light collection. The durability of the vessel 4 is improved.

  According to the concentrator 4 of the concentrating device 1 according to the first embodiment described above, by adopting the resin base material 9, it is possible to achieve a significant weight reduction as compared with the case of metal. it can. Moreover, by providing the resin-made base material 9 with the rectangular lattice-shaped reinforcing rib surface A, the strength of the base material 9 can be sufficiently secured while suppressing the amount of resin used. Such a reinforcing rib surface A can be easily formed by integral molding of the resin base material 9, which is advantageous in reducing the manufacturing cost. Furthermore, by adopting a configuration in which the load received by the condenser 4 due to wind or the like is efficiently shared by the torque tube 10 and the metal rib 11, the structure of the condenser 4 is simplified and the weight is reduced while concentrating. The strength of the vessel 4 can be ensured. Moreover, since the torque burden of a base material can be reduced by providing the torque tube 10 and the metal rib 11, the base material 9 can be reduced in thickness and weight. Therefore, according to this concentrator 4, a significant weight reduction can be achieved as compared with the conventional product.

  Further, according to the light collector 4, by adopting a film mirror for the reflecting portion 3, it is possible to significantly reduce the weight as compared with the case where a glass mirror is used. Furthermore, according to this concentrator 4, since the glass bending process which was the cause of the manufacturing cost increase becomes unnecessary, the cost of the concentrator 4 can be reduced.

  Therefore, according to this condensing apparatus 1, since the concentrator 4 can be significantly reduced in weight, the condensing apparatus 1 as a whole can be reduced in weight. Moreover, in this condensing device 1, since the output requested | required of the drive mechanism 7 becomes small by the weight reduction of the collector 4, the drive mechanism 7 can be made small and the manufacturing cost of an apparatus is aimed at. Can do.

[Second Embodiment]
As shown in FIG. 5, the light collector 20 of the light collector according to the second embodiment has a ventilation slit S compared to the light collector 4 according to the first embodiment. Mainly different.

  In the concentrator 20 according to the second embodiment, a horizontally long slit S that extends from the front side of the reflecting unit 3 to the back side of the substrate 9 is formed in the reflecting unit 21 and the substrate 22. The ventilation slits S are respectively formed between the four rows of mirror units constituting the reflecting portion 21 and the base material 22. FIG. 3 shows rows 21a to 21d of the mirror surfaces of the four rows of mirror units.

  According to the collector 20 according to the second embodiment, the wind blown to the collector 20 can be passed by the ventilation slit S, so that the load applied to the collector 20 by the wind can be greatly reduced. it can. Therefore, according to this concentrator 20, since durability with respect to wind can be improved, the life of the concentrator 20 can be improved.

  The present invention is not limited to the embodiment described above.

  The condensing device according to the present invention can be utilized for various applications. For example, in addition to solar thermal power generation, a solar cell may be disposed in the receiver 2 to be used as a concentrating solar power generation device.

  Further, a thin glass mirror may be employed in the reflecting portion 3 instead of the film mirror. According to the present invention, since it is not necessary to give the reflecting portion 3 strength, the light collector 4 can be reduced in weight by adopting a thin glass mirror having a thickness of 0.03 mm to 1 mm. The same applies to the case where a thin glass mirror is employed for the reflecting portion 21.

  Moreover, the shape of the base material 9 is not restricted to what was shown by embodiment. For example, the base material 9 may partially have a frame shape or the like, and may be any shape that can appropriately support the reflecting portion 3. Moreover, the base material 9 may be configured to be bonded to the reflective portion 3 with an adhesive, or may be configured to mechanically grip the reflective portion 3.

  Further, the shape of the reinforcing rib surface A is not limited to the quadrangular lattice shape, and may be a polygonal lattice shape. For example, the reinforcing rib surface A may have a triangular lattice shape, a pentagonal lattice shape, a hexagonal lattice shape, or the like. Moreover, the shape of the grating | lattice which combined the triangle, the square, etc. may be sufficient. In addition, as long as the base material 9 can be reinforced, the base material 9 is not necessarily a lattice, and may have a shape similar to a rectangular lattice shape. In the embodiment, the reinforcing rib surface A is provided on the entire back side of the base material 9, but the reinforcing rib surface A may be provided on only a part thereof.

  Further, the shape of the torsion load receiving member described in the claims does not necessarily need to be the shape of the torque tube 10. The torsion load receiving member may be a round bar, a polygonal column, a plate shape, or other various shapes, and may be any shape that can receive a torsion load applied to the substrate 9.

  Similarly, the bending load receiving member described in the claims is not necessarily made of metal, and may be made of resin. Further, the bending load receiving member is not limited to the direction orthogonal to the torsion load receiving member, and may be configured to extend in the direction intersecting with the torsion load receiving member. The shape of the bending load receiving member is not limited to the shape of the metal rib 11 and may be any shape that can receive a bending load applied to the base material 9.

  Moreover, the ventilation slit S shown to 2nd Embodiment may be only one place or two places, and may be formed four or more places. Moreover, the ventilation slit S does not need to be formed long in the horizontal direction, and may be formed long in the vertical direction or the oblique direction. Further, the shape of the ventilation slit S may be an elliptical shape in addition to the rectangular shape.

  DESCRIPTION OF SYMBOLS 1 ... Condensing apparatus 2 ... Receiver 3,21 ... Reflection part 3a-3d, 21a-21d ... Row | line | column of mirror surface 4,20 ... Condenser 5 ... Receiver support member 6 ... Support stand 7 ... Drive mechanism 9,22 ... Base material 9a-9d ... Row of base panel 10 ... Torque tube (torsion load receiving member) 11 ... Metal rib (bending load receiving member) 12 ... Horizontal rib 13 ... Vertical rib 21 ... Reflecting portion A ... Reinforcing rib surface S ... Ventilation slit

Claims (8)

A trough-type concentrator having a reflecting portion that condenses the linearly extending receiver,
A resin base material on which the reflective portion is disposed;
A metal torsion load receiving member provided on the opposite side of the reflecting portion with respect to the base material and extending along the receiver;
A bending load receiving member extending along the base material in a direction crossing the torsion load receiving member, and fixed to the base material and the torsion load receiving member,
The collector is characterized in that a polygonal rib-shaped reinforcing rib surface is provided on the substrate on the side opposite to the reflecting portion.   The concentrator according to claim 1, wherein the bending load receiving member reaches both ends of the base material in an extending direction of the bending load receiving member.   The concentrator according to claim 1, wherein the reflecting portion is a film mirror.   The concentrator according to claim 1 or 2, wherein the reflecting portion is a thin glass mirror having a thickness of 0.03 mm to 1 mm.   The said base material is formed by injection molding or compression molding, The concentrator as described in any one of Claims 1-4 characterized by the above-mentioned.   The said base material consists of any materials among an acryl, a polycarbonate, a polymethyl, a methacrylate, styrene, and a polystyrene, The collector as described in any one of Claims 1-5 characterized by the above-mentioned.   The ventilation part which escapes from the front side of the said reflection part to the other side of the said reflection part in the said base material is formed in the said reflection part and the said base material, The any one of Claims 1-6 characterized by the above-mentioned. Concentrator according to item.   A condensing apparatus comprising: the concentrator according to any one of claims 1 to 7; and a drive mechanism that changes a direction of the concentrator in accordance with movement of the sun.

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