JP2014119134A - Light condensing device and heat collection facility including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably rotate a mirror of a light condensing device around a shaft with high accuracy.SOLUTION: A drive device which directs sunlight reflected by a mirror to a predetermined light condensing position comprises: a first drive part 51 which is supported by a support base and which rotates a mirror structure around a first rotary shaft line A1; and a second drive part which is supported by the first drive part 51 and which rotates the mirror structure around a second rotary shaft line A2. The first drive part 51 includes: a first rotary shaft 52 with the first rotary shaft line A1 being a central axis line; a first rotary shaft supporting part 59 which rotatably supports the first rotary shaft 52; and a first drive mechanism 60 which rotates the first rotary shaft 52. The first rotary shaft supporting part 59 includes: a rear bearing 56 for supporting the first rotary shaft 52 in a position separating in the first rotary shaft direction from an intersection point Q1 between the first rotary shaft line A1 and a second rotary shaft line A2; a front bearing 55 for supporting the first rotary shaft 52 in a position closer to the intersection point Q1 than the rear bearing 56 in the first rotary shaft direction; and a connection member 57 for rigidly connecting the rear bearing 56 and the front bearing 55.

Description

  The present invention relates to a condensing device that reflects sunlight with a mirror and condenses the sunlight at a predetermined condensing position, and a heat collecting facility including the same.

  In recent years, facilities using thermal energy obtained by concentrating sunlight at a predetermined position as environmentally friendly clean energy have been actively developed.

  As a condensing device that condenses sunlight at a predetermined position, for example, there is a device described in Patent Document 1 below.

  The light collecting device includes a red meridian axis as a polar axis parallel to the earth axis, a declination axis provided at a tip of the red meridian axis, a driving mechanism for rotating the ecliptic axis and the declination axis, A frame attached to the declination axis and a plurality of mirrors attached to the frame via hinges are provided.

JP 2004-37037 A

  The above-mentioned Patent Document 1 does not disclose the configuration and arrangement of the drive mechanism that rotates each axis. However, the drive mechanism that rotates the red meridian axis near the intersection with the declination axis in the red meridian axis. Is arranged. In this case, the distance between the mirror arranged on one side of the declination axis and the mirror arranged on the other side of the declination axis is widened, and the declination axis and red when a plurality of mirrors receive a wind load. The moment applied to the intersection with the meridian increases, making it difficult to stably rotate a plurality of mirrors around each axis. Conversely, it is assumed that a driving mechanism for rotating the red meridian axis is disposed at the end of the red meridian axis opposite to the intersection with the declination axis. In this case, a load is applied to both ends of the red meridian axis, and the red meridian axis is bent, so that it is difficult to stably rotate the plurality of mirrors around the meridian axis with high accuracy. That is, the technique described in Patent Document 1 has a problem that it is difficult to stably rotate the mirror with high accuracy.

  Accordingly, the present invention focuses on the problems of the prior art, and an object thereof is to provide a light collecting device capable of stably rotating a mirror around an axis with high accuracy, and a heat collecting facility provided with the same. .

The light condensing device according to one aspect of the invention for solving the above problems is as follows.
A mirror structure having a plurality of mirrors, a driving device that directs sunlight reflected by the plurality of mirrors of the mirror structure to a predetermined condensing position, and a support base that supports the driving device,
The drive device includes a first drive unit that is supported by the support base and rotates the mirror structure around a first rotation axis, and a second drive unit that is supported by the first drive unit and orthogonal to the first rotation axis. A second drive unit that rotates the mirror structure around a rotation axis, and the first drive unit includes a first rotation axis having the first rotation axis as a central axis, and the first rotation axis. A first rotation shaft support portion that rotatably supports the first rotation axis; and a first drive mechanism that rotates the first rotation shaft, wherein the first rotation shaft support portion includes the first rotation shaft support portion. The first rotary shaft is supported so as to be rotatable around the first rotary axis at a position away from the intersection of the rotary axis and the second rotary axis in the first rotary axis direction where the first rotary axis extends. A rear bearing and the first rotational axis around the first rotational axis at a position closer to the intersection than the rear bearing in the first rotational axis direction; A front bearing that is rotatably supported, and a connecting member that rigidly connects the rear bearing and the front bearing, and the first drive mechanism is attached to the rear bearing side of the connecting member, and A rotational driving force is applied to the rear bearing side of one rotation shaft, and the support base supports the front bearing side of the connecting member that supports the first rotation shaft via the rear bearing and the front bearing. It is characterized by doing.

  In the condensing device, the first rotation shaft is lengthened, and the first drive mechanism is disposed at a position away from the intersection of the first rotation axis and the second rotation axis with the first rotation axis. A mirror can be disposed in the vicinity of the intersection of the first rotation axis and the second rotation axis, and the moment applied to this intersection when the mirror structure receives a wind load can be reduced. Moreover, in the said condensing device, among the comparatively long 1st rotating shafts, the position of the front bearing side near the intersection of a 1st rotating shaft line and a 2nd rotating shaft line, in other words, the mirror attached to a 2nd rotating shaft. Since the position close to the center of gravity of the structure is supported by the support base via the bearing and the connecting member, the mirror structure and the driving device can be stably supported by the support base.

  Thus, in the said condensing device, although the 1st rotating shaft is made comparatively long, the 1st rotating shaft is rotated with the front bearing and rear bearing which are mutually spaced apart in the 1st rotating shaft direction. Since the front bearing and the rear bearing are rigidly connected by the connecting member while being supported at both ends, resistance to the bending moment applied to the first rotating shaft can be enhanced. Furthermore, since the front bearing and the rear bearing are rigidly connected by the connecting member, it is possible to suppress twisting around the first rotation axis of the rear bearing with respect to the front bearing.

  Therefore, according to the condensing device, the mirror structure can be stably rotated with high accuracy around the first rotation axis.

  Here, in the light concentrating device, the connecting member is a tube that has a cylindrical shape around the first rotation axis and covers the outer peripheral sides of the first rotation shaft, the rear bearing, and the front bearing. May be.

  In the condensing device, the weight of the connecting member can be reduced while increasing the rigidity of the connecting member.

Further, in the light collecting device in which the connecting member is the tube,
It is preferable that the first drive unit has a seal member that closes between the inner peripheral side of the tube and the outer peripheral side of the first rotating shaft at the positions of both ends of the tube.

  In the condensing device, the sealing member can prevent rainwater, dust, and the like from the outside from entering the front bearing and the rear bearing.

  Further, in any one of the above condensing devices, the support base supports the first rotating shaft via the rear bearing and the front bearing so that the angle of the first rotating shaft with respect to a horizontal plane can be changed. A support arm that supports the front bearing side of the connecting member, and the driving device includes an elevation angle changing unit that changes an angle of the first rotation axis with respect to a horizontal plane, and the elevation angle changing unit is configured to connect the connecting member. A force for changing the angle of the first rotating shaft may be applied to the rear bearing side of the connecting member while supporting the rear bearing side.

  In a heat collection facility, a plurality of light collecting devices are often provided. In this case, the relative position with respect to the condensing position is different for each of the plurality of heat collecting devices, and it is necessary to change the angle of the first rotation axis with respect to the horizontal plane. Since the condensing device has an elevation angle changing unit, when providing a plurality of concentrating devices, the angle of the first rotation axis with respect to the horizontal plane can be changed for each of the plurality of heat collecting devices.

  Further, in any one of the above condensing devices, the second drive unit has a second rotation attached to the front bearing side end of the first rotation shaft with the second rotation axis as a central axis. The mirror structure has a center of gravity between the plurality of mirrors, and the center of gravity of the mirror structure is within the first rotation axis or within an extension of the first rotation axis. In addition, it may exist in the second rotation shaft or on an extension of the second rotation shaft.

  In the condensing device, since the center of gravity of the mirror structure exists in the first rotation axis or in the extension of the first rotation axis and in the second rotation axis or the extension of the second rotation axis, Even if the first rotating shaft rotates or the second rotating shaft rotates, the position of the center of gravity of the mirror structure hardly moves, and the weight of the mirror structure itself causes the mirror structure itself to move to the first position. There is almost no moment to try to rotate around the one rotation axis or the second rotation axis.

  Therefore, in the condensing device, the driving force for rotating the mirror structure can be reduced, the rigidity of the first rotating shaft and the second rotating shaft, and the bearing that rotatably supports these rotating shafts. The mirror structure can be stably supported even when the rigidity of the support structure including is somewhat small.

Here, in the light collecting device in which the center of gravity of the mirror structure exists in the first rotating shaft or on the extension of the first rotating shaft and in the second rotating shaft or on the extension of the second rotating shaft, The support base supports the front bearing side of the connecting member that supports the first rotary shaft via the rear bearing and the front bearing so that the angle of the first rotary shaft with respect to a horizontal plane can be changed. A support arm, and a support column having the support arm fixed to one end and the other end fixed to the foundation,
The center of gravity of the mirror structure may be positioned vertically above a cross section at the other end of the support column.

  In this condensing device, the center of gravity of the mirror structure exists vertically above the cross section at the end of the support surface on the installation surface side, so the bending moment applied to the installation surface side of the support table due to the weight of the mirror structure Can be reduced. For this reason, a support stand and its foundation can be reduced in size.

The heat collection facility according to one aspect of the invention for solving the above problems is as follows:
One of the above condensing devices and a heat receiver that heats the medium with sunlight condensed by the condensing device are provided.

  According to the present invention, the mirror can be stably rotated around the axis with high accuracy.

It is explanatory drawing which shows the structure of the heat collecting equipment in one Embodiment which concerns on this invention. It is a schematic perspective view of the heliostat in one embodiment concerning the present invention. It is a side view of the heliostat in one embodiment concerning the present invention. It is a figure which shows the mirror structure in one Embodiment which concerns on this invention, The figure (a) is a rear view of a mirror structure, The figure (b) is a bottom view of a mirror structure. It is explanatory drawing which shows the mirror in one Embodiment which concerns on this invention, The figure (a) is explanatory drawing which shows the shape of the front of a mirror, The figure (b) is explanatory drawing which shows the shape of the bottom face of a mirror. FIG. 6C is an explanatory diagram showing the shape of the side surface of the mirror. It is sectional drawing around each rotating shaft in one Embodiment concerning this invention. It is a perspective view of a support stand in one embodiment concerning the present invention. It is explanatory drawing which shows the mutual relationship of the optical axis of the mirror structure in one Embodiment which concerns on this invention, a gravity center, and each rotation axis. It is explanatory drawing which shows the setting method of the 1st rotating shaft line in one Embodiment which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a heat collection facility including a light collecting device according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the heat collection facility 1 of the present embodiment reflects sunlight with a heat receiver 10 to which sunlight is irradiated, a tower facility 20 to which the heat receiver 10 is fixed, and a mirror. The heat receiving device 10 is provided with a plurality of heliostats 30 as a light collecting device that irradiates sunlight, and a control device 2 that controls the plurality of heliostats 30.

  The heat receiver 10 includes a heat receiving portion 11 that is irradiated with sunlight, and a casing 12 that covers the heat receiving portion 11. A working fluid such as water or air is supplied into the heat receiving unit 11, and the working fluid is heated by heat from sunlight. When the working fluid is air, the heat collection facility 1 further includes a gas turbine that is driven by heated air and a generator that generates electric power by driving the gas turbine, thereby constituting a solar thermal power generation facility. be able to. In addition, when the working fluid is water, the heat collecting facility further includes a steam turbine driven by steam generated by heating water and a generator driven by the steam turbine to constitute the solar power generating facility. be able to. In this example, the heat energy from the heat receiver 10 is used for generating electric energy, but this heat energy may be used for generating steam.

  A plurality of heliostats 30 are scattered in a ring-shaped region around the tower facility 20. In other words, a plurality of heliostats 30 are arranged 360 ° in the circumferential direction around the tower facility 20, and a plurality of heliostats 30 are also arranged in the perspective direction with the tower facility 20 as a reference. Here, a plurality of heliostats 30 are arranged in a ring-shaped region with the tower facility 20 as the center, but a plurality of heliostats 30 are arranged in a fan-shaped region or a rectangular region requiring the tower facility 20. May be arranged.

  2 to 4, the heliostat 30 includes a mirror structure 31 having a mirror 32 that reflects sunlight, a drive device 40 that directs the mirror 32 of the mirror structure 31 in a target direction, and these And a support base 80 for supporting. The drive device 40 is a device that rotates the mirror structure 31 around the first rotation axis A1 and the second rotation axis A2 that are orthogonal to each other, as will be described in detail later.

  The mirror structure 31 includes two mirrors 32, a back reinforcing plate 33 bonded to the back of each mirror 32, and a support frame 35 that supports the back of the back reinforcing plate 33.

  As shown in FIG. 5, the two mirrors 32 included in the mirror structure 31 have the same size and the same rectangular plate shape. In the mirror structure 31 of this embodiment, the reflecting surfaces of the two mirrors 32 form one rotationally symmetric surface, specifically, a paraboloid of revolution. The top of this paraboloid is located at the midpoint between the two mirrors 32. Hereinafter, in this embodiment, the vertex of the paraboloid of revolution is the principal point Q1 of the mirror structure 31, and the axis extending through the principal point Q1 in the normal direction to the reflecting surface, that is, rotational symmetry of the rotationally symmetric surface. The axis is the optical axis Ao of the mirror structure 31.

  As shown in FIGS. 2 to 4, the back reinforcing plate 33 is bonded to the entire back surface of the two mirrors 32 as described above. The back reinforcing plate 33 is formed of a thin steel plate, a thin aluminum alloy plate, a resin plate, or the like, and is formed so as to have an uneven shape in the plate thickness direction. The back reinforcing plate 33 is bonded to the back surface of the mirror 32 via an adhesive at the top of the convex portion of the concavo-convex shape. On the other hand, a support frame 35 is joined to a portion of the back reinforcing plate 33 that is recessed relative to the convex portion by welding or adhesion.

  The support frame 35 includes a plurality of support beam members 36 (see FIG. 4) and a connecting member 37 that connects the plurality of support beam members 36 to each other. The cross section of the support beam member 36 has a groove shape or a square pipe shape. The plurality of support beam members 36 are joined to the back reinforcing plate 33 such that the longitudinal direction thereof faces the radial direction from the optical axis Ao of the mirror structure 31. Specifically, in this embodiment, two support beam members 36 are provided for one back reinforcing plate 33. One end portion of each support beam member 36 faces the optical axis Ao side, and the other end portion faces the corner side of the back reinforcing plate 33, that is, the corner side of the mirror 32. The back reinforcing plate 33 is provided so as to form a letter. Here, although two support beam members 36 are provided for one back reinforcing plate 33, that is, one mirror 32, three or more support beam members 36 may be provided from the viewpoint of strength.

  The connecting member 37 of the support frame 35 includes a connecting beam 38 interconnecting the two supporting beam members 36 of one back reinforcing plate 33, a connecting beam 38 on the one back reinforcing plate 33 side, and the other back reinforcing plate 33. It has a cylindrical shaft 42 for connecting the side connection beam 38 and a second outer tube 54 through which the shaft 42 is inserted.

  The central axis of the shaft 42 that connects the connecting beams 38 passes through the principal point Q1 that is orthogonal to the optical axis Ao and that is the apex of the paraboloid of the mirror structure 31. As shown in FIG. 6, the shaft 42 enters the second outer tube 54 and can be rotated around its own central axis by two bearings 43 provided in the second outer tube 54. It is supported by. Sealing members 44 that close the space between the inner peripheral side of the second outer tube 54 and the outer peripheral side of the shaft 42 are provided at both ends of the second outer tube 54. The bearing 43 is a bearing capable of receiving a radial load and an axial load, such as a deep groove ball bearing or an angular ball bearing. In the present embodiment, the shaft 42 described above forms the second rotation axis, and the central axis of the shaft 42 forms the second rotation axis A2. Therefore, hereinafter, this shaft 42 is referred to as a second rotating shaft 42.

  The first rotation axis A1 orthogonal to the second rotation axis A2 passes through the principal point Q1, which is the apex of the paraboloid of the mirror structure 31, as in the second rotation axis A2, as shown in FIGS. ing. That is, in the present embodiment, the intersection of the first rotation axis A1 and the second rotation axis A2 and the principal point Q1 of the mirror structure 31 coincide with each other. Further, as shown in FIG. 8, the center of gravity Q2 of the mirror structure 31 in the present embodiment is on the optical axis Ao of the mirror structure 31 and is based on the mirror 32 from the principal point Q1 of the mirror structure 31. It exists in the position which shifted | deviated slightly to the support beam member 36 side. However, the center of gravity Q2 exists in the intersection of the first rotating shaft 52 and the second rotating shaft 42.

  The driving device 40 includes a first driving unit 51 that rotates each mirror 32 around the first rotation axis A1, a second driving unit 41 that rotates each mirror 32 around the second rotation axis A2, and a first driving unit 40 with respect to the horizontal plane. And an elevation angle changing unit 70 that changes the angle of one rotation axis A1.

  The second drive unit 41 includes the above-described second rotation shaft 42 having the second rotation axis A2 as the central axis, and the above-described bearing 43 (supporting the second rotation shaft 42 rotatably about the second rotation axis A2. 6) and a second drive mechanism 45 that rotates each mirror 32 about the second rotation axis A2.

  As shown in FIG. 6, the first drive unit 51 rotatably supports the first rotation shaft 52 having the first rotation axis A1 as a center axis and the first rotation axis A1 as a center. It has the 1st rotating shaft support part 59 and the 1st drive mechanism 60 which rotates the 1st rotating shaft 52 around the 1st rotating shaft line A1.

  The first rotating shaft 52 includes a first rotating shaft main body 53 having the first rotating axis A1 as a central axis, and the above-described second outer tube 54 that is a part of the connecting member 37 in the mirror structure 31. ing. As described above, the second rotating shaft 42 enters the second outer tube 54 and is supported by the bearing 43 provided inside the second outer tube 54 so as to be rotatable around the second rotating axis A2. ing. One end of the first rotating shaft main body 53 is joined to the side periphery of the second outer tube 54. In other words, the second outer tube 54 serves as a shaft connecting member that connects the second rotating shaft 42 and the first rotating shaft main body 53.

  As described above, in this embodiment, the shaft 42 and the second outer tube 54 of the connecting member 37 that are components of the mirror structure 31 are also components of the drive device 40.

  The first rotating shaft support portion 59 is a connecting member that rigidly connects the two bearings 55 and 56 and the two bearings 55 and 56 that rotatably support the first rotating shaft 52 around the first rotation axis A1. The first outer tube 57 and a seal member 58 that closes both ends of the first outer tube 57 are provided. The first outer tube is a tube that has a cylindrical shape around the first rotation axis A <b> 1 and covers the outer sides of the first rotation shaft main body 53 and the two bearings 55 and 56. The front bearing 55, which is one of the two bearings 55 and 56, supports the front portion of the first rotating shaft 52 near the intersection Q1 between the first rotating axis A1 and the second rotating axis A2. The rear bearing 56, which is the other bearing, supports a rear portion of the first rotation axis A1 that is far from the intersection Q1 between the first rotation axis A1 and the second rotation axis A2. Both the front bearing 55 and the rear bearing 56 are bearings that can receive a radial load and an axial load, such as a deep groove ball bearing and an angular ball bearing. The inner rings of the front bearing 55 and the rear bearing 56 are fixed to the outer peripheral surface of the first rotating shaft main body 53, and the outer rings of the front bearing 55 and the rear bearing 56 are fixed to the inner peripheral surface of the first outer tube 57. Therefore, in this embodiment, the outer ring of the front bearing 55 and the outer ring of the rear bearing 56 are connected and integrated by the first outer pipe 57, and the front bearing 55, the rear bearing 56, and the first outer pipe 57 are combined. Thus, one bearing device that supports the first rotating shaft 52 is configured.

  The first drive mechanism 60 has, for example, a linear motion actuator. The operating end of the linear motion rod of this linear motion actuator is connected to, for example, the end of the first rotary shaft 52 on the rear bearing 56 side via a link mechanism. The rod cover of this linear motion actuator is pin-connected to the first outer tube 57, for example. As described above, the first drive mechanism 60 does not use a linear actuator as a drive source, but may use a motor having a rotation output shaft as a drive source. In this case, the motor case is fixed to the first outer tube 57, and the rotation output shaft of this motor is directly connected to the first rotation shaft 52 by a spline or key via a reduction gear.

  Further, the second drive mechanism 45 has, for example, a linear actuator. The operating end of the linear motion rod of this linear motion actuator is pin-connected to the back surface of the mirror structure 31 that can rotate around the second rotational axis A2, for example. The rod cover of this linear motion actuator is pin-connected to the first outer tube 57, for example. Note that the second drive mechanism 45 is not limited to the linear motion actuator as a drive source as described above, and may be a motor having a rotation output shaft as a drive source. In this case, the motor case is fixed to the first outer tube 57, and the rotation output shaft of this motor is directly connected to the second rotation shaft 42 via a speed reducer by a spline or a key. Further, when each of the first rotating shaft 52 and the second rotating shaft 42 is rotated by a motor, an orthogonal two-axis integrated motor that rotates each of the first rotating shaft 52 and the second rotating shaft 42 may be provided. Good.

  The elevation angle changing unit 70 includes a turnbuckle 71 that changes the angle of the first rotation axis A <b> 1 with respect to the support base 80.

  As shown in FIG. 3, the turnbuckle 71 includes a body frame 72 in which female screws are formed at both ends, and screw rods 72 a and 72 b that are screwed into each end of the body frame 72. doing. One end of the screw rod 72 a of the turnbuckle 71 is pin-connected to the first outer tube 57. The end of the other screw rod 72 b of the turnbuckle 71 is pin-connected to the support base 80.

  When the body frame 72 of the turnbuckle 71 is rotated, the mutual interval between the screw rods 72a and 72b changes. When the distance between the screw rods 72a and 72b changes, the distance between the pin connection position of the first outer tube 57 and the pin connection position of the support base 80 relative to the turnbuckle 71 changes. As a result, the angle of the first rotation shaft 52 with respect to the horizontal plane changes.

  Here, the turnbuckle 71 is used for the elevation angle changing unit 70 that changes the angle of the first rotating shaft 52 with respect to the support base 80. Instead, for example, a linear actuator or a rotary motion is converted into a linear motion. A device having a rack-and-pinion mechanism that rotates and a rotary motor that rotates the pinion of this mechanism may be used. Further, a fixing plate may be used for the purpose of simplifying the structure.

  As shown in FIGS. 3 and 6, the support base 80 is formed along the base plate 81 placed at the installation position of the heliostat 30, the support 82 fixed on the base plate 81, and the bus of the support 82. And a plurality of ribs 83, and a shaft support base 85 that supports the first rotation shaft 52.

  The support 82 has a rotating body shape formed by rotating an isosceles trapezoid around the center axis of the isosceles trapezoid, that is, a truncated cone shape. The rib 83 is provided from the lower end to the upper end of the support 82 along the bus line of the support 82. If there is no problem in strength, the rib 83 may be provided only in a part from the lower end to the upper end of the support 82, or the rib 83 may be omitted.

  The shaft support base 85 has a pair of arm plates (support arms) 86 facing each other with a space therebetween, and a connecting plate 87 for connecting the ends of the pair of arm plates 86 to each other. The connecting plate 87 of the shaft support base 85 is fixed to the upper end of the column 82. In addition, as shown in FIG. 6, a first outer tube 57 into which the first rotating shaft 52 is inserted is disposed between the pair of arm plates 86. In the first outer tube 57, an elevation angle changing shaft 88 extending in the horizontal direction and perpendicular to the first rotation axis A1 is provided in the vicinity of the front bearing 55. The arm plate 86 is formed with a shaft hole 86a that penetrates in the horizontal direction and into which the elevation angle changing shaft 88 is rotatably inserted around its central axis. Therefore, the first outer tube 57 and the first rotating shaft 52 inserted into the first outer tube 57 are rotated horizontally by the elevation angle changing shaft 88 inserted through the shaft hole 86a of the arm plate 86 about its own central axis. The angle with respect to can be changed.

  By the way, in this embodiment, as mentioned above using FIG.2 and FIG.3, the intersection of 1st rotation axis A1 and 2nd rotation axis A2 and the main point Q1 of the mirror structure 31 correspond. For this reason, in this embodiment, even if the mirror structure 31 rotates around the first rotation axis A1 or the second rotation axis A2, the main point Q1 of the mirror structure 31 does not move. In other words, in this embodiment, the main point Q1 of the mirror structure 31 is a fixed point. In addition, since the intersection of 1st rotation axis A1 and 2nd rotation axis A2 and the main point Q1 of the mirror structure 31 correspond, the code | symbol of an intersection may also be set to Q1.

  Thus, in this embodiment, even if the mirror structure 31 rotates about the first rotation axis A1 or the second rotation axis A2, the main point Q1 of the mirror structure 31 does not move. Therefore, the relative position between the main point Q1 of the mirror structure 31 and the heat receiving part 11 (heat collecting position) of the heat receiver 10 does not change.

  Therefore, in this embodiment, the angle formed by the virtual line connecting the sun and the principal point Q1 of the mirror structure 31 and the virtual line connecting the principal point Q1 of the mirror structure 31 and the condensing position is bisected. If the optical axis Ao of the mirror structure 31 is directed in the direction, the sunlight reflected by the mirror 32 of the mirror structure 31 can be accurately irradiated to the heat receiving unit 11 of the heat receiver 10.

  Further, the center of gravity Q2 of the mirror structure 31 described above exists in the intersection of the first rotating shaft 52 and the second rotating shaft 42 as described above. For this reason, in this embodiment, the position of the center of gravity Q2 hardly moves even if the mirror structure 31 rotates about the first rotation axis A1 or about the second rotation axis A2. The moment of trying to rotate the mirror structure 31 itself around the first rotation axis A1 and the second rotation axis A2 with the weight of the mirror structure 31 itself hardly occurs.

  Therefore, in the present embodiment, the driving force for rotating the mirror structure 31 can be reduced, the rigidity of the first rotating shaft 52 and the second rotating shaft 42, and the rotating shafts 52 and 42 are rotated. The mirror structure 31 can be stably supported even when the rigidity of the support structure including the bearings that can be supported is somewhat small.

  Thus, in this embodiment, since rigidity of the 1st rotating shaft 52, the 2nd rotating shaft 42, etc. can be made small, it is also possible to achieve size reduction and weight reduction of these.

  Further, in the present embodiment, as shown in FIG. 8, the center of gravity Q2 of the mirror structure 31 is located at the horizontal cross section at the lower end of the column 82 or vertically above the horizontal cross section. Thus, in this embodiment, since the center of gravity Q2 of the mirror structure 31 is located vertically above the horizontal cross section at or near the lower end of the support 82, the weight of the mirror structure 31 is placed at the lower end of the support 82. The overturning moment generated by is hardly affected. Therefore, in this embodiment, the cross-sectional secondary moment at the lower end portion of the support 82 can be reduced, the support 82 can be reduced in size and weight, and the foundation can be reduced in size and weight.

  Moreover, in this embodiment, the 1st rotating shaft 52 is lengthened, and the 1st drive mechanism 60 is made into the position which left | separated from the intersection Q1 of 1st rotating shaft line A1 and 2nd rotating shaft line A2 with this 1st rotating shaft 52. Therefore, the mirror 32 can be disposed in the vicinity of the intersection Q1 between the first rotation axis A1 and the second rotation axis A2, and the moment applied to the intersection Q1 when the mirror structure 31 receives a wind load. Can be reduced. In the present embodiment, among the relatively long first rotary shafts 52, the position on the front bearing 55 side near the intersection Q1 between the first rotary axis A1 and the second rotary axis A2, in other words, the second rotary shaft. Since the position close to the center of gravity Q2 of the mirror structure 31 attached to 42 is supported by the support base 80 via the bearings 55 and 56 and the first outer tube 57, the mirror structure 31 and the driving device 40 are supported. It is possible to stably support the table 80.

  Thus, in this embodiment, although the 1st rotating shaft 52 is made comparatively long, it is the 1st rotating shaft by the front bearing 55 and the rear bearing 56 which are mutually spaced apart in the 1st rotating shaft direction. Since the front bearing 55 and the rear bearing 56 are rigidly connected to each other by the first outer pipe 57, the resistance against the bending moment applied to the first rotation shaft 52 can be enhanced. Furthermore, since the front bearing 55 and the rear bearing 56 are rigidly connected by the first outer tube 57, it is possible to suppress twisting around the first rotational axis A1 of the rear bearing 56 with respect to the front bearing 55.

  Therefore, according to this embodiment, the mirror structure 31 can be stably rotated with high accuracy around the first rotation axis A1.

  Further, if the front bearing 55 and the rear bearing 56 are not rigidly connected by the first outer tube 57, the first rotation axis direction in which the first rotation axis A1 extends in order to receive a bending moment applied to the first rotation shaft 52. It is necessary to form a front bearing with two deep groove ball bearings adjacent to each other in the same manner, and similarly form a rear bearing with two deep groove ball bearings adjacent to each other in the first rotation axis direction. However, in the present embodiment, since the front bearing 55 and the rear bearing 56 are rigidly connected by the first outer tube 57, each of the front bearing 55 and the rear bearing 56 may be constituted by one deep groove ball bearing or the like. The first rotating shaft 52 is supported at both ends, and the bending moment applied to the first rotating shaft 52 can be received by the front bearing 55, the rear bearing 56 and the first outer tube 57. Therefore, according to the present embodiment, the configuration of the first rotating shaft support portion 59 can be simplified as compared with the case where the front bearing 55 and the rear bearing 56 are not rigidly connected by the first outer tube 57. Further, according to the present embodiment, the moment around the elevation angle changing axis can be effectively supported by the turnbuckle 71.

  Next, the installation method of the heliostat 30 demonstrated above is demonstrated.

  In astronomical telescopes, equatorial mounts are used to facilitate tracking of stars and the sun. This equatorial mount has an ecliptic axis set parallel to the earth axis and an ecliptic axis perpendicular to the ecliptic axis. In this equatorial mount, the astronomical telescope is rotated about the ecliptic axis and the declination axis, the optical axis of the astronomical telescope is once directed to the target astronomical object, and thereafter the astronomical telescope is rotated about the ecliptic axis. Only can cope with the diurnal motion of celestial bodies.

  Accordingly, in the heliostat, if the mirror structure drive device has two rotation axes orthogonal to each other, one rotation axis is set parallel to the ground axis, and the mirror structure is centered on the rotation axis. By turning the, the sun moving in a diurnal motion can be tracked. However, the heliostat needs to reflect light from the sun that moves in a diurnal motion and irradiate the fixed heat receiver 10 with the light. For this reason, as with the astronomical telescope, even if one of the two orthogonal rotation axes is set parallel to the ground axis, the mirror structure must be rotated around the two rotation axes. It is impossible to irradiate the fixed heat receiver 10 with light from the moving sun.

  Therefore, in the following description, a helio that can irradiate the fixed heat receiver 10 with light from the sun moving in a diurnal motion by basically rotating the mirror structure 31 around one rotating shaft 52. A method for setting the rotation axis A1 of the stat 30 will be described.

  First, as shown in FIG. 9, the position data on the earth where the mirror structure 31 is installed, the position data on the earth of the heat receiving part 11 of the heat receiver 10 that becomes the sunlight condensing position Pc, and within one year. And solar position data based on the position of the mirror structure 31 for each of a plurality of times on a predetermined day.

  The position data and the condensing position data of the mirror structure 31 are coordinate data on the earth, that is, data indicated by latitude, longitude, and altitude. Here, the position data of the mirror structure 31 is the position data of the principal point Q1 which is a fixed point of the mirror structure 31 here.

  The solar position data based on the position of the mirror structure 31 is data indicated by the azimuth angle of the sun Ps from the position of the mirror structure 31 and the elevation angle of the sun Ps. Further, the predetermined day of the year is, for example, a spring equinox day or an autumn equinox day. Moreover, the number of sun position data is the number which can specify the locus | trajectory of the sun Ps of the day in a predetermined day, and is specifically 3 or more.

  Next, for each of a plurality of times on a predetermined day, an optical axis vector Vo indicating the direction of the optical axis Ao of the mirror structure 31 that directs the light from the sun Ps at the time to the condensing position Pc is obtained. The direction of the optical axis Ao of the mirror structure 31 that directs the light from the sun Ps at a certain time to the condensing position Pc is the virtual line L1 connecting the sun Ps and the principal point Q1 of the mirror structure 31, and the mirror structure 31 This is a direction that bisects the angle formed by the virtual line L2 connecting the principal point Q1 and the condensing position Pc. In the present embodiment, a unit vector facing this direction is an optical axis vector Vo.

  The trajectory of the direction line segment indicated by the optical axis vector Vo accompanying the diurnal motion of the sun Ps describes the side circumferential surface of a certain cone C. That is, the trajectory of the optical axis Ao of the mirror structure 31 that directs the light from the sun Ps that moves in a diurnal direction toward the condensing position Pc describes the side peripheral surface of the cone C. Therefore, next, a cone C having a generatrix along which a direction line segment indicated by a plurality of optical axis vectors Vo for each time is defined is determined, and a cone center axis vector Va indicating the direction of the center axis of the cone C is obtained. This conical center axis vector Va is also a unit vector.

  When the direction of the first rotation axis A1 of the heliostat 30 coincides with the direction indicated by the conical center axis vector Va, the mirror structure 31 is rotated once around the second rotation axis A2, and the mirror structure 31 If the reflected sunlight is applied to the condensing position Pc, the mirror structure 31 is basically simply rotated around the first rotation axis A1, and the sun Ps is accompanied by the diurnal motion. The locus of the direction line segment indicated by the actual optical axis vector Vo forms the side peripheral surface of the cone C described above. That is, by making the direction of the first rotation axis A1 coincide with the direction of the conical center axis vector Va, the sun Ps that moves in a diurnal motion only by basically rotating the mirror structure 31 about the first rotation axis A1. Can be applied to the light condensing position Pc.

  Here, as described above with reference to FIG. 1, a plurality of heliostats 30 are installed in the installation area of the heat collection facility. Naturally, the relative position with respect to the heat receiver 10 is different for each of the plurality of heliostats 30. For this reason, the angle (elevation angle) with respect to the horizontal plane of the first rotation axis A1 for each of the plurality of heliostats 30 is different. Further, the orientation of the first rotation axis A1 for each of the plurality of heliostats 30 is also different.

  Therefore, in the actual installation of the heliostat 30, first, the mirror structure 31 is located at the position indicated by the position data of the mirror structure 31 acquired previously, and the orientation of the first rotation axis A1 is the cone center axis vector Va. The heliostat 30 is installed so that the direction indicated by Next, the first rotation axis A1 is set so that the angle of the first rotation axis A1 with respect to the horizontal plane becomes the angle of the conical center axis vector Va with respect to the horizontal plane. At this time, the turnbuckle 71 of the elevation angle changing unit 70 is operated to set the angle of the first rotation shaft 52 with respect to the horizontal plane. Thus, the installation of the heliostat 30 is completed.

  After the installation of the heliostat 30, the first rotating shaft 52 and the second rotating shaft 42 are rotated so that the sunlight reflected by the mirror structure 31 is irradiated to the condensing position Pc. The mirror structure 31 around the first rotation axis A1 and the second rotation axis A2 is rotated. In this way, once the sunlight reflected by the mirror structure 31 is irradiated to the condensing position Pc, as described above, the mirror structure is basically basically rotated around the first rotation axis A1. It is possible to irradiate the fixed condensing position Pc with the light of the sun moving in a diurnal motion only by rotating 31.

  Therefore, in this embodiment, the control system of the drive device 40 is simplified and energy consumption can be suppressed.

  The elevation angle of the sun changes as the season changes, even at the same time of day. When the elevation angle of the sun changes with this seasonal change, the optical axis vector Vo at the same time of the day also changes. As a result, the cone C defined when the first rotation axis A1 is set also changes with the seasonal change. Will change. However, the change of the cone C accompanying the seasonal change is only a change in the diameter of the bottom surface of the cone C, and there is no change in the direction of the central axis of the cone C. For this reason, in the present embodiment, the change in the rotation angle of the second rotation axis A2, in other words, the rotation angle of the mirror 32 around the second rotation axis 42 is changed for the change in the elevation angle of the sun accompanying the seasonal change. To respond.

  Further, in the above embodiment, the mirror structure 31 having two mirrors 32 is illustrated, but the present invention is not limited to this, and can be applied to one having three or more mirrors. It is. Moreover, although the mirror structure 31 which has the rectangular plate-shaped mirror 32 is illustrated in the above embodiment, this invention is not limited to this, For example, other shapes, for example, a semicircle plate shape, It may be a mirror structure having a mirror.

  Q1 ... principal point (intersection point), Q2 ... center of gravity, Ao ... optical axis, A1 ... first rotation axis, A2 ... second rotation axis, 1 ... heat collecting equipment, 2 ... control device, 10 ... heat receiver, 11 ... heat receiving , 20 ... Tower facility, 30 ... Heliostat (condensing device), 31 ... Mirror structure, 32 ... Mirror, 33 ... Back reinforcement plate, 35 ... Support frame, 36 ... Support beam member, 37 ... Connecting member, 40 DESCRIPTION OF SYMBOLS ... Drive device, 41 ... 2nd drive part, 42 ... 2nd rotating shaft, 43 ... Bearing, 44 ... Seal member, 45 ... 2nd drive mechanism, 51 ... 1st drive part, 52 ... 1st rotating shaft, 53 ... First rotating shaft main body 54 ... second outer tube 55 ... front bearing (bearing) 56 ... rear bearing (bearing) 57 ... first outer tube (connecting member) 58 ... seal member 59 ... first rotation Shaft support section, 60 ... first drive mechanism, 70 ... elevation angle changing section, 71 ... turn buckle, 80 ... support base, 82 ... support, 5 ... axis support base, 86 ... arm plate (support arm)

Claims (7)

A mirror structure having a plurality of mirrors;
A driving device for directing sunlight reflected by the plurality of mirrors of the mirror structure to a predetermined condensing position;
A support base for supporting the drive device,
The drive device includes a first drive unit that is supported by the support base and rotates the mirror structure around a first rotation axis, and a second drive unit that is supported by the first drive unit and orthogonal to the first rotation axis. A second drive unit that rotates the mirror structure around a rotation axis,
The first drive unit includes a first rotation shaft having the first rotation axis as a central axis, a first rotation shaft support unit that supports the first rotation shaft so as to be rotatable about the first rotation axis, A first drive mechanism for rotating the first rotation shaft,
The first rotating shaft support portion is configured to displace the first rotating shaft at a position away from the intersection of the first rotating axis and the second rotating axis in the first rotating shaft direction in which the first rotating shaft extends. A rear bearing rotatably supported about the first rotational axis, and the first rotational axis can be rotated about the first rotational axis at a position closer to the intersection than the rear bearing in the first rotational axis direction. A front bearing that supports the front bearing, and a connecting member that rigidly connects the rear bearing and the front bearing,
The first driving mechanism is attached to the rear bearing side of the connecting member, and applies a rotational driving force to the rear bearing side of the first rotating shaft,
The support base supports the front bearing side of the connecting member supporting the first rotating shaft via the rear bearing and the front bearing;
A light condensing device. The light collecting device according to claim 1,
The connecting member is a tube that has a cylindrical shape around the first rotation axis, and covers the outer peripheral side of the first rotation shaft, the rear bearing, and the front bearing.
A light condensing device. The light collecting device according to claim 2,
The first drive unit has a seal member that closes between the inner peripheral side of the tube and the outer peripheral side of the first rotating shaft at the positions of both ends of the tube.
A light condensing device. In the condensing device according to any one of claims 1 to 3,
The support base supports the front bearing side of the connecting member that supports the first rotary shaft via the rear bearing and the front bearing so that the angle of the first rotary shaft with respect to a horizontal plane can be changed. Having a support arm,
The drive device includes an elevation angle changing unit that changes an angle of the first rotation axis with respect to a horizontal plane,
The elevation angle changing unit applies a force for changing the angle of the first rotating shaft to the rear bearing side of the connecting member while supporting the rear bearing side of the connecting member.
A light condensing device. In the condensing device according to any one of claims 1 to 4,
The second drive unit has a second rotation shaft attached to an end of the first rotation shaft on the front bearing side, with the second rotation axis as a central axis.
The mirror structure has a center of gravity between the plurality of mirrors,
The center of gravity of the mirror structure is present in the first rotation axis or on the extension of the first rotation axis, and in the second rotation axis or on the extension of the second rotation axis.
A light condensing device. The light collecting device according to claim 5,
The support base supports the front bearing side of the connecting member that supports the first rotary shaft via the rear bearing and the front bearing so that the angle of the first rotary shaft with respect to a horizontal plane can be changed. A support arm, and a support column having the support arm fixed to one end and the other end fixed to the foundation,
The center of gravity of the mirror structure is located vertically above the cross section at the other end of the column;
A light condensing device. The light collecting device according to any one of claims 1 to 6,
A heat receiver for heating the medium by sunlight collected by the light collecting device;
A heat collecting facility characterized by comprising:

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