WO2010078704A1

WO2010078704A1 - Splcing type of light-gathering solar energy collecting device and splicing method thereof

Info

Publication number: WO2010078704A1
Application number: PCT/CN2009/000960
Authority: WO
Inventors: 肖刚
Original assignee: 上海神曦太阳能科技有限公司
Priority date: 2008-12-29
Filing date: 2009-08-21
Publication date: 2010-07-15
Also published as: CN101769636B; CN101769636A

Abstract

A splicing type of light-gathering solar energy collecting device is disclosed and the solar energy collecting device includes a base plate (1), two head plates (2) and a transparent panel (3); each head plate (2) is provided with a bearing (5) and a heat collecting tube (4) crosses over two bearings (5); the head plate (2) is provided with two sides on the top and bottom, and the top side is linear and the bottom side is parabolical; the base plate (1) and each head plate (2) are provided with a surface as reflecting mirror surface, and each side of the base plate (1), the head plates (2) and the panel (3) is provided with a strip slicing component; a closing tank is sliced by the base plate (1), the head plates (2) and the panel (3) via the slicing components and a light-gathering reflecting construction is formed; the heat collecting tube (4) crosses over the inner rings of two bearings (5) and is positioned on the focal line of the light-gathering reflecting construction. A splicing method for the solar energy collecting device mentioned above is disclosed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of solar energy utilization, and more particularly to a trackable assembled cylindrical concentrating solar energy collecting device and a assembling method thereof.

Background technique:

Parabolic trough tracking concentrating solar collectors are a cost-effective way to use solar energy in a variety of environments, from medium-scale solar thermal harvesting to large-scale solar power plants. It focuses the incident sunlight onto a collector tube located on the focal line of the parabolic cylinder with one or a series of mirror surfaces curved into a parabolic cylinder. After collecting the heat energy of the solar light into heat energy, the collection tube The circulating heat transfer medium inside the heat pipe collects heat energy for collection, or for heating or for power generation. Commercially operated large trough solar power plants have been around for decades.

The biggest difficulty faced by trough solar energy collection is that the installation cost of the device is too high, so that the energy cost used for energy collection is economically lacking competitive advantage compared with fossil energy such as coal, which seriously restricts its large-scale promotion. Therefore, cost reduction devices is the main topic of technological development ₀

Among the cost of trough solar installations, the cost of parabolic concentrating mirrors is often the most important part. This is because the manufacture of mirrors is now generally carried out by bending a flat-shaped base material (metal or glass) into a desired shape by means of a mold. Any small inhomogeneities in material and temperature during the forming process will introduce local normal direction errors. At the same time, the efficiency of the mirror surface is extremely sensitive to the local normal direction error, and a small normal direction error will cause defocusing, which reduces the collection efficiency of the device. Therefore, the precision is very high during the processing, and the scrap rate is not easy to control, which seriously increases the cost.

Moreover, the existing trough solar devices mostly adopt an open technical solution without a front transparent panel. Open trough devices rely on the strength of the mirror base material to prevent deformation and sufficient wind resistance, so the substrate material must have high mechanical strength and sufficient thickness. This further increases the difficulty and cost of forming processing.

The small closed-type acquisition device with front transparent panel can obtain strong natural geometric stability. The anti-deformation and wind-resistance ability is much stronger than that of the sputum-type device, but the problem of the local normal direction error caused by the mirror-heated forming bow I Still very serious.

The presence of forming errors directly affects the concentration of the collection device, which limits its efficiency. The theoretical maximum line concentration of the parabolic trough collection device is about 220 times, corresponding to 70 times the surface concentration. However, the most advanced nominal line concentration rate in commercial devices is currently one.

Confirmation It is 82 times, and these devices are expensive to manufacture and install. Under the general processing conditions, the hot-formed trough-type collecting device has many difficulties in ensuring an effective line concentrating rate of 30 times.

Another drawback associated with pre-formed mirror surfaces is packaging and shipping costs. In particular, small enclosed units are inexpensive to manufacture, light in weight and bulky, and in some cases the cost of packaging, storage and transportation can even approach or exceed manufacturing costs.

Summary of the invention:

The object of the present invention is to provide an assembled solar energy collecting device, which can greatly simplify the manufacturing process and reduce the cost, and can easily obtain a higher light collecting precision by the correcting method, and can also make the volume and the packaging and transportation volume. The cost is minimized.

The technical solution of the present invention is realized as follows: The assembled concentrating solar energy collecting device is characterized in that: the solar energy collecting device comprises a bottom plate, two top plates, a transparent panel, and two top plates each have a bearing, The root collecting heat pipe passes through two bearings; the top plate has upper and lower sides, the upper side is a straight line, the lower side is a symmetrical parabola, and the bottom plate and the top plate each have a surface as a mirror surface; and each side of the bottom plate, the top plate and the panel is provided with a strip The splicing member, the bottom plate, the top plate and the panel are assembled into a closed box shape by the splicing member and form a concentrating reflection structure, and the heat collecting tube is positioned on the focal line of the condensing reflection structure through the two bearing inner rings.

The assembling method of the assembled concentrating solar energy collecting device is characterized in that: the assembling method of the solar energy collecting device comprises the following steps: a. inserting the bottom plate slightly and inserting the top edge into the splicing member groove at the bottom edge of a top plate; b. Insert the other top edge of the bottom plate into the splicing member groove of the bottom edge of the other top plate; c. Pass the heat collecting tube into the bearing of the two top plates; d. Cover the panel while the two sides of the bottom plate Inward pressing forces it into the inner corner of the corner strip of the panel; wherein the panel presses the side of the bottom plate inwardly by the side splicing member to elastically bend the latter into a shape close to the symmetrical parabolic cylinder, the shape further passing The splicing of the lower edge of the top plate and the top edge of the bottom plate is corrected and fixed; after the splicing, the mirror faces of the bottom plate and the top plate form a concentrating reflection structure; the side strip splicing members of the bottom plate and the panel are angle strips, which are respectively fixed to the side of the bottom plate and the panel After the assembly, the two corner strips abut against each other under the outward elastic force of the bottom plate; the top edge splice member of the panel is a metal corner strip; the splice member on the top panel side Square metal tube, f. Fasten the top edge of the panel with the upper edge of the top plate with fastening bolts. The splicing member at the bottom edge of the top plate is a grooved strip with a lower hook at the bottom, and the splicing member at the top edge of the bottom plate is a slanted strip. The protrusion and the opening of the top edge; the top edge of the bottom plate is inserted into the grooved strip when assembling, and the strip-shaped protrusion of the bottom plate inserted is completely placed into the groove of the splicing member at the bottom edge of the top plate, and is formed by the grooved strip The hook lock does not fall off, and the splitting of the top edge of the bottom plate is pressed by the bottom of the grooved strip; at this time, the splitting of the top edge of the bottom plate is pressed by the bottom of the grooved strip to waterproof, and finally the metal strip and the square metal tube are pressed. Fastened with bolts after assembly.

The invention can be directly assembled from a flat plate material, and utilizes the natural elastic bending shape of the material. Converging light surface, without pre-forming by heating. The advantage is that it is relatively simple to manufacture and install, which not only greatly simplifies the manufacturing process and reduces the cost, but also makes it easy to obtain a high concentration accuracy by means of correction, while also minimizing the volume and cost during packaging and transportation.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 to 4 are schematic views showing the assembly process of the solar energy collection device of the present invention. 1 is a distributed component, wherein the bottom plate is in an elastic bending state; FIG. 2 is a case where the bottom plate and the top plate are assembled and assembled; FIG. 3 is a case after the heat collecting tube is inserted into the bearing; and FIG. 4 is a collecting device after the assembly is completed.

Fig. 5 is a cross-sectional view showing the side of the panel and the side of the bottom plate of the present invention (before the insertion position).

Figure 6 is a cross-sectional view of the splicing member of the side of the panel and the side of the bottom plate of the present invention (after being assembled).

Figure 7 is a cross-sectional view of the splicing member of the lower side of the top plate and the top edge of the bottom plate of the present invention (before the insertion position).

Figure 8 is a cross-sectional view of the splicing member of the lower side of the top plate and the top side of the bottom plate of the present invention (after being inserted into the position).

Figure 9 is a cross-sectional view of the splicing member of the top edge of the panel and the top edge of the panel of the present invention (before the loading position).

Figure 10 is a cross-sectional view of the splicing member of the top edge of the panel and the top edge of the panel of the present invention (after being assembled).

Figure 11 is a perspective view of the lower floor correcting member of the present invention.

detailed description:

The invention will now be further described with reference to the drawings and embodiments.

Reference numeral 1 in the drawing is the bottom plate of the device, 2 is the top plate of the device, 3 is the face plate of the device, 4 is a heat collecting tube, and 5 is a bearing. 6 is the top edge splicing member of the panel, 7 is the side splicing member of the panel, 8 is the side splicing member of the bottom plate, 9 is the top splicing member of the bottom plate, 10 is the lower splicing member of the top plate, and 11 is the upper splicing of the top plate The member, 12 is a curved strip at the top of the panel side splicing member, 13 is a splicing fastening bolt of the panel and the top panel, 14 is an inner hook at the lower part of the lower splicing member of the top panel, 15 is a slit of the top edge of the bottom plate, 16 is a corrective reflecting surface a rod-shaped turning member having an edge curvature, 17 is a supporting member at one end of the rod-shaped turning member against the bottom plate, 20 is a corner strip for correcting the curvature of the curved surface, and 21 is a wire for correcting the curvature of the curved surface. Pressure bar.

The invention is a concentrating solar energy collecting device, characterized in that: the solar energy collecting device comprises a bottom plate 1, two top plates 2, a transparent panel 3, a heat collecting tube 4 and two bearings 5, and the characteristics are as follows: The bottom plate is a rectangular uniform plate under the condition of no external force; the transparent panel is rectangular; the top plate has upper and lower sides, the lower side is a symmetrical parabola, and the upper side is a straight line; the top plate has a shaft hole in the middle, and the center of the shaft hole is a lower side parabola Below the focus or focus of the line, the distance between the center and the focus is not more than 0.01 times the length of the top plate; the bearing is fixed around the shaft hole; the bottom plate and the top plate each have a smooth mirror with a reflectance of 80% or more. a strip-shaped splicing member (6, 7, 8, 9, 10, 11) is provided on each side of the bottom plate, the top plate and the panel; the bottom plate, the top plate and the panel can be assembled into a closed box-shaped structure by means of the splicing member, wherein The panel presses the side edges of the bottom plate inwardly by the side splicing members to elastically bend the latter to be close to the shape of the symmetrical parabolic cylinder surface, and the shape is further corrected and fixed by the splicing of the lower edge of the top plate and the top edge of the bottom plate; Forming a concentrating reflection structure inwardly with the mirror of the top plate; the heat collecting tube is positioned on the focal line of the concentrating reflection structure through the two bearing inner rings; and the box structure can surround the bearing and the heat collecting tube by means of a manual or control mechanism Free rotation to track the movement of the sun, greatly improving the collection effect of concentrating and solar energy.

In order to bend the bottom plate as close as possible to the parabolic cylinder, the ratio of thickness to width of the acquisition device should be between 1 : 3 and 1 : 4 and as close as possible to 1: 4 . The width to length ratio of the device can be selected from 1:1 to 1:3.

The transparent panel can be made of glass or transparent plastic, and the bottom and top panels can be made of metal sheets (steel or aluminum) or plastic sheets. In order to avoid the difference between the thermal expansion and contraction coefficients of different materials, the deformation of the cabinet when the ambient temperature changes too much, the glass panel should be used with the metal bottom plate and the top plate, and the plastic panel should be made of plastic bottom plate and top plate. With the use of.

The reflective surface thus formed provides a good approximation of the parabolic cylinder. The calculation shows that the theoretical maximum line concentration of this surface is about 70 times. The actual available concentrating rate can be quite close to this because the general commercial homogenous sheet has sufficient consistency so that there is little observable local normal direction error in this surface. After taking into account materials and processing errors and safety factors, it is not difficult to obtain reliable products with a practical line concentration of 40 times or more without industrial correction. Handmade can also achieve 30 times better results.

In addition to large-scale solar power plants, the maximum operating temperature of a typical solar thermal collector does not exceed 300 °C. For this type of application, a 40x line concentration ratio is sufficient. On the other hand, solar power plants want to increase the operating temperature to at least 350 ° C in order to achieve higher power generation efficiency. For such use, the present invention proposes the following method for correcting the reflection surface error, which can increase the effective line concentrating rate by 80 times or more.

The difference between the reflective curved surface formed by the elastic bending and the ideal parabolic cylindrical surface is mainly that the curvature of the curved surface edge is too low, and the curvature is in the region between the distance from the center line of the bottom plate of 1/6 to 1/3 of the width of the curved surface. high. In particular, the curvature of the curved edge of the curved surface is too low, so that the effective collection area of the device without correction is lost by 10% to 15% due to defocusing.

Because the actual reflective surface is different from the parabolic cylinder, the actual focal line of the reflective surface is below the focal line of the parabolic cylinder. 008。 The distance between the two focal lines is the width of the reflective surface (ie the length of the top side of the top plate) of 0. 008 The position of the axis of the top plate is set below the parabola focus and the distance from the focus of the parabola is 0. 005 to 0. 01 times the most reasonable position.

In order to correct the curvature of the curved edge of the curved surface, the method proposed by the present invention is to install 4 to 20 rod-shaped turning members 16 on the outer sides of the bottom plate; one end of the rod-shaped turning member is fixed to the side strip of the bottom plate The splicing member is connected to the edge of the bottom plate by the side strip splicing member; the other end of the rod-shaped swaying member abuts and presses the bottom plate; the contact point of the other end with the bottom plate is the distance from the edge of the bottom plate Width of 0. 13 to 0. 23 times, or direct contact, or contact through the struts 17; the force of the other end pressing the bottom plate is transferred to the edge of the bottom plate by the transfer of the rod-shaped turning member, and the edge of the bottom plate is curvatured倍之间。 Q. 1 times to Q. 6 times between the width of the bottom plate.

A preferred option is that the contact point of the other end of the rod-shaped turning member with the bottom plate is from the edge of the bottom plate by a distance of Q. 2 times, and the radius of curvature of the edge of the bottom plate is corrected to 1.45 times the width of the reflective surface. The struts may be springs or adjustable length bolts that adjust the strength of the curvature of the bottom edge of the shank by adjusting the length of the bolt.

In order to correct an area of excessive curvature, the invention proposes to add a correcting member composed of two metal corner strips 19 and one or more steel wire pressing rods 20 outside the assembled bottom plate; the length of the metal strip Same as the length of the bottom plate, the direction is parallel to the heat collecting tube, and is fixed to the outside of the bottom plate. The center line of the bottom plate is between 1/6 and 1/3 of the width of the collecting device; the two ends of the steel wire pressing rod are fixed to the collecting device On the side, the inside presses the bottom plate by pressing the metal corner strips. As shown in Figure 11.

The middle part of the steel bar can be bolted, and the pressure applied to the bottom plate by the length of the bolt can be adjusted by adjusting the length of the bolt.

A preferred option is: The metal corner strips are fixed below the bottom plate from the center line of the bottom plate to 1/4 of the width of the collection device.

The method can not only accurately correct the theoretical curvature error of the reflective surface, but also correct the errors caused by material inconsistency and gravity. The calculated post-correction theoretical maximum line concentration is as high as 170 times.

The corrected reflection surface is closer to the ideal parabolic cylinder, so its focal line is closer to the focal line of the parabolic cylinder. The center of the shaft hole of the top plate may be positioned at the parabola focus or below the parabola focus and the distance from the parabola focus is not more than 0.002 times the width of the reflective surface.

If only the rod-shaped turning member is used to correct the edge curvature is too low and the curvature is too high, the distance between the end of the rod-shaped turning member that abuts the bottom plate and the bottom plate is from the edge of the bottom plate. 17 times. After the correction, the theoretical maximum line concentration is more than 90 times, and the loss of the effective collection area of the curved edge is basically eliminated.

The collector tube can be used in a variety of different configurations depending on the application. For working temperature A low temperature enthalpy collection device that does not exceed 10 Q ° C, a common metal round tube with a black exterior can meet the requirements. The metal round tube can also be laid with a layer of solar photovoltaic cells to generate electricity, and the water circulation in the tube can provide cooling for the solar photovoltaic cells on the one hand, and provide a low-temperature heat source on the other hand to realize the combined heat and power. The heat collecting tube of the high-temperature collecting device needs to be insulated by a transparent glass tube, and the space between the heat collecting tube and the glass tube is vacuum-sealed to enhance the heat insulation effect.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS - In a specific embodiment, the side strip-shaped splicing members of the bottom plate and the panel are angled strips respectively fixed to the side edges of the bottom plate and the panel, and the two corner strips are assembled against each other under the external elastic force of the bottom plate Tight, as shown in Figure 5 and Figure 6. In order to prevent slipping, a curved strip 12 is attached to the top of the panel corner strip to lock the corner strip of the bottom plate. The curved strip is only installed in the middle of the panel and does not exceed 2/3 of the length of the panel to ensure that the bottom panel can be elastically passed over the curved strip into the splicing position during assembly.

The top edge splicing members of the panel are metal corner strips, and the splicing members on the top panel are square metal tubes. The metal corner strips and the square metal tubes are assembled and fastened by bolts 13 after assembly. As shown in Figure 9 and Figure 10.

The splicing member at the bottom of the top plate is a grooved strip with a lower inner hook 14, and the splicing member at the top side of the bottom plate is a strip-shaped protrusion 9 with a bevel and a split of the top edge 15, as shown in Fig. 7 and Fig. 8(8). When assembling, the top edge of the bottom plate is inserted into the grooved strip, and the strip-shaped protrusion of the bottom plate is completely inserted into the grooved strip, and is locked by the inner hook in the grooved strip without falling off. At this time, the slit at the top of the bottom plate is pressed by the bottom of the grooved strip to provide waterproofing.

The solar collector can be assembled in the following order. 1. Insert the bottom plate slightly into the slot of the splicing member at the bottom edge of the top plate; 2. Insert the other top edge of the bottom plate into the splicing member groove at the bottom edge of the other top plate; 3. Pass the heat collecting tube Into the bearing of the two top plates; 4. Cover the panel and press the two sides of the bottom plate inward to force it into the inside of the corner strips on the side of the panel; 5. Use the fastening bolts to the top edge of the panel Fasten the top of the top plate.

One specific production is that the bottom plate and the top plate are made of a common polystyrene plate with a mirror-reflecting film layer on one side, and the thickness is 2, and the panel is made of a 2-leg thick polycarbonate transparent plate. The base plate is a square having a length and a width of one meter, and the width of the reflective surface after the assembly is 0. 857 meters. The center of the shaft hole is located 28 以下 below the top of the top plate, and the maximum thickness of the collecting device is 232. The outer diameter of the collector tube is 10 awake. Therefore, the design line concentration of the acquisition device is approximately 86 times. Taking the midpoint of the top edge of the top plate as the origin, the curve equation under the bottom plate is (in millimeters): y = 228 - 0. 0012434X ²

The rod-shaped turning member is made of a stainless steel strip with a width of 15 and a thickness of 3 mm, and the spacing of the adjacent rod-shaped turning members is Q. 2 times the width of the bottom plate. The supporting member is an adjustable length bolt, and the steel pressing rod is adjusted by bolts. Length and pressure.

The collection device after the assembly is completed can be corrected by direct observation, such as Next. The observation position is located on the front side of the acquisition device, and the distance is 1/2Q to 1/6 of the product of the width of the collection device and the line concentration. At this time, an enlarged image of the heat collecting tube can be observed on the reflective curved surface of the collecting device. Moving the viewing position then moves the image. 5倍。 The image of the width of the image is about 0.5 to 0.6 times. As the image moves from the center to the edge, its width should gradually shrink proportionally. If the image width of a certain area is too high, the curvature of the surface of the area is too high, and vice versa.

If the width of the image does not decrease or increase as it moves from the center to a certain direction, it can be corrected by shortening the length of the adjusting bolt of the steel bar; if the width is reduced too fast, the length of the bolt is elongated.

If the edge image 3⁄4 degrees is less than 0.55 times the width of the middle, it can be corrected by increasing the length of the struts; otherwise, shortening the length.

The actual measurement shows that a hand-made acquisition device can be accurately focused at a line concentration of more than 80 times after being corrected by the method, except that the two edges of the reflection surface do not exceed 2% of the reflection area beyond the curvature correction area. Outside the area, there is no apparent observable defocus loss, and the overall optical efficiency of the acquisition device can reach over 70%.

Claims

Claim

1. The assembled concentrating solar energy collecting device is characterized in that: the solar energy collecting device comprises a bottom plate, two top plates, a transparent panel, two top plates each having a bearing, and one collecting tube passing through two bearings The top plate has upper and lower sides, the upper side is a straight line, the lower side is a symmetrical parabola, and the bottom plate and the top plate each have a smooth mirror surface with a reflectance of more than 80%; and each side of the bottom plate, the top plate and the panel is provided with a strip shape; The splicing member, the bottom plate, the top plate and the panel are assembled into a closed box shape by the splicing member and form a concentrating reflection structure, and the heat collecting tube is positioned on the focal line of the condensing reflection structure through the two bearing inner rings.

2. The assembled concentrating solar energy collecting device according to claim 1, wherein: the bottom plate is a rectangular uniform plate under the condition of no external force, and the transparent plate is a rectangular uniform plate; Hole, the center of the shaft hole is the focus of the lower parabola or below the focus. The distance between the center and the focus is not more than Q. Q1 times the length of the top plate. The bearing is fixed around the shaft hole.

3. The assembled concentrating solar energy collecting device according to claim 1, wherein: the panel presses the side of the bottom plate inwardly by the side splicing member to elastically bend the latter to be close to the symmetric parabolic column. The shape of the surface is further corrected and fixed by the splicing of the lower edge of the top plate and the top edge of the bottom plate; the spliced bottom plate and the mirror of the top plate face the inner side to form a concentrating reflection structure; the side strip splicing members of the bottom plate and the panel are corner strips , respectively fixed to the side of the bottom plate and the panel, the two corner strips abut against each other under the outward elastic force of the bottom plate; the top edge splicing member of the panel is a metal corner strip; the splicing member on the top plate is a square metal tube, a metal corner The strip and the square metal tube are fastened by bolts after assembling; the joint member at the bottom of the top plate is a grooved strip with an inner hook at the lower part; the joint member at the top side of the bottom plate is a strip-shaped protrusion with a slope and a split of the top edge; The top edge of the bottom plate is inserted into the grooved strip, and the strip-shaped protrusion of the bottom plate is inserted into the grooved strip completely, and is locked by the inner hook in the grooved strip, and the top edge of the bottom plate is closed. The fork is pressed by the bottom of the grooved strip.

4. The assembled concentrating solar energy collecting device according to claim 1, wherein: 4 to 20 rod-shaped turning members are mounted on the outer sides of the bottom plate; one end of the rod-shaped turning member is fixed to a side strip-shaped splicing member of the bottom plate, and connected to the edge of the bottom plate by the side strip-shaped splicing member; the other end of the rod-shaped turning member abuts and presses the bottom plate; the contact point of the other end with the bottom plate is away from the bottom plate The distance of the edge is Q. 13 to 0.23 times of the width of the bottom plate, or is in direct contact, or is contacted by the struts; the force of pressing the bottom plate by the other end is reversed by the transmission of the rod-shaped turning member, and the edge of the bottom plate is turned 5倍之间。 The distance between the width of the bottom plate is between Q. 1 times to 0.6 times between the width of the bottom plate.

5倍倍的范围内的范围内。 The concentrating concentrating solar collector device according to claim 4, wherein: the distance between the end of the rod-shaped member of the bottom plate and the bottom plate is from the edge of the bottom plate is Q. 2 times the width of the bottom plate The radius of curvature of the edge of the bottom plate is corrected to 1.45 times the width of the reflective surface. The struts may be springs or bolts of adjustable length, and the correcting strength of the curvature of the bottom edge of the sole plate by the length of the adjusting bolt is adjusted.

6. The assembled concentrating solar energy collecting device according to claim 1, wherein: the outer surface of the bottom plate is provided with a correcting member composed of two metal corner bars and at least one steel wire pressing bar; The length is the same as the length of the bottom plate, and the direction is parallel to the heat collecting tube, and is fixed below the bottom plate. The center line of the bottom plate is between 1/6 and 1/3 of the width of the collecting device; the two ends of the steel bar are fixed for collecting. The device is edged and the inside is pressed against the bottom plate by pressing the metal corner strips.

7. The assembled concentrating solar energy collecting device according to claim 1, wherein: the ratio of the thickness to the width of the collecting device is between 1:3 and 1:4, and the ratio of the width to the length is 1. : Between 1 and 1:3.

8. The assembling method of the assembled concentrating solar energy collecting device according to claim 1, wherein: the assembling method of the solar energy collecting device comprises the following steps: a. inserting a top plate into a top plate after slightly bending the bottom plate In the splicing member groove of the bottom edge; b. insert the other top edge of the bottom plate into the splicing member groove of the bottom plate of the other top plate; c. penetrate the heat collecting tube into the bearing of the two top plates; d. At the same time, the two side edges of the bottom plate are pressed inwardly to force the inside of the corner strips of the panel to be positioned; wherein the panel presses the side edges of the bottom plate inwardly by the side splicing members to elastically bend the latter to be close to symmetry. The shape of the parabolic cylinder is further corrected and fixed by the splicing of the lower edge of the top plate and the top edge of the bottom plate; the mirror of the bottom plate and the top plate is formed to form a concentrating reflection structure after splicing; the side strip splicing members of the bottom plate and the panel are angled The strips are respectively fixed on the side edges of the bottom plate and the panel, and the two corner strips are tightly pressed against each other under the outward elastic force of the bottom plate; the top edge jointing member of the panel is a metal corner The splicing member on the top plate is a square metal pipe, f. The top edge of the panel is fastened with the upper edge of the top plate by fastening bolts, and the splicing member at the bottom edge of the top plate is a grooved strip with a lower hook at the bottom, and the top edge of the bottom plate The splicing member is a strip-shaped protrusion with a bevel and a split of the top edge; the top edge of the bottom plate is inserted into the grooved strip when assembling, and the strip-shaped protrusion inserted into the back bottom plate is completely placed into the groove of the splicing member at the bottom edge of the top plate, And the inner hook of the grooved strip is not locked off, and the splitting of the top edge of the bottom plate is pressed by the bottom of the grooved strip; at this time, the splitting of the top edge of the bottom plate is pressed by the bottom of the grooved strip to waterproof, and finally The metal corner strips and the square metal tube are assembled and fastened by bolts.