A new type of PVT solar thermal power generation device

Abstract

The present invention relates to the field of solar thermal utilization and photovoltaic power generation technology, and specifically discloses a novel PVT solar thermal power generation device. The device comprises a housing, a first heat collection assembly, a second heat collection assembly, a photovoltaic panel, and a solar tracking bracket. The housing comprises a base plate and side panels fixedly connected to both sides of the base plate. The first heat collection assembly comprises an upper header, a lower header, and a heat collection tube. The heat collection tube is disposed between the upper header and the lower header. The upper header and the lower header are disposed on the upper side of the base plate and are respectively fixedly connected to the ends of the side panels. The side panels, the upper header, and the lower header together form a accommodating chamber on the upper side of the base plate. The second heat collection assembly is disposed within the accommodating chamber. The photovoltaic panel is disposed above the second heat collection assembly. The solar tracking bracket comprises a connecting frame disposed in the middle of the lower side of the base plate. The present invention provides the first and second heat collection assemblies to improve heat collection efficiency. The solar tracking bracket ensures a perfect incident angle of sunlight, thereby improving photoelectric and photothermal conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal utilization and photovoltaic power generation, and in particular to a novel PVT solar thermal collection and power generation device. Background Art

[0002] Currently, there are two main ways to utilize solar energy: one is to convert solar energy into electricity, commonly known as photovoltaics; the other is to convert solar energy into heat, known as solar thermal energy. Solar panels generate a certain amount of heat while converting solar energy into electricity. If this heat is not removed promptly, it will cause the solar panel temperature to rise, resulting in a decrease in conversion efficiency. The PVT thermal power generation system can recycle and reuse the heat generated by solar panels during operation, reducing the temperature of the solar panels and improving power generation efficiency.

[0003] Since solar panels are not photothermal materials after all, the heat energy collected by existing PVT thermal power generation devices is only the parasitic heat energy generated by the solar panels, which cannot perfectly utilize solar energy and has low heat collection efficiency. In addition, the installation angle of existing PVT thermal power generation devices is fixed and cannot be adjusted according to the actual position of the sun, resulting in poor solar thermal incident angles and further limiting the efficiency of thermal power generation. Summary of the Invention

[0004] The purpose of the present invention is to provide a novel PVT solar thermal power generation device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A new type of PVT solar thermal power generation device includes an outer shell, a first thermal collection component, a second thermal collection component, a photovoltaic panel and a solar tracking bracket. The outer shell includes a bottom plate and side plates fixedly connected to both sides of the bottom plate. The first thermal collection component includes an upper header, a lower header and a thermal collection pipe. The thermal collection pipe is fixedly connected between the upper header and the lower header. The upper header and the lower header are arranged on the upper side of the bottom plate and are respectively fixedly connected to the two ends of the side plates. The side plates, the upper header and the lower header are combined to form a accommodating chamber on the upper side of the bottom plate. The second thermal collection component is arranged inside the accommodating chamber. The photovoltaic panel is arranged on the upper side of the second thermal collection component. The solar tracking bracket includes a connecting frame, which is fixedly connected to the middle part of the lower side of the bottom plate.

[0007] Furthermore, there are multiple heat collecting tubes, which are arranged in parallel with equal intervals and are all double-pass direct current all-glass vacuum tubes.

[0008] Furthermore, the second heat collecting assembly includes an upper header, a lower header and a row pipe, the upper header and the lower header are fixedly connected to the upper header and the lower header respectively, the row pipe is fixedly connected between the upper header and the lower header, the row pipe is divided into multiple groups, and the multiple groups of row pipes are arranged in parallel with equal intervals, the upper header and the lower header are provided with multiple mounting holes, the mounting holes are located between two adjacent groups of row pipes, the heat collecting pipe is fixedly connected to the inner side of the mounting hole, the top and bottom of the accommodating chamber are fixedly connected with a glass cover and an insulation layer respectively, one end of the upper header is fixedly connected with a connecting pipe, the end of the connecting pipe away from the upper header passes through the side plate and is fixedly connected to one end of the upper header, one end of the lower header is fixedly connected with a water inlet pipe, and one end of the lower header is also provided with a water outlet.

[0009] Furthermore, each group of the row pipes includes a rectangular pipe, and the photovoltaic panel is fixedly connected to the upper side of the rectangular pipe.

[0010] Furthermore, each group of the row pipes includes three circular pipes, a heat conducting plate is fixedly connected to the upper side of the circular pipes, and the photovoltaic panel is fixedly connected to the upper side of the heat conducting plate.

[0011] Furthermore, the solar tracking bracket also includes a fixed column and a second U-shaped member, the second U-shaped member includes an upper horizontal plate, a lower horizontal plate and a second connecting plate, the second connecting plate is fixedly connected between the upper horizontal plate and one end of the lower horizontal plate, the end of the lower horizontal plate away from the second connecting plate is fixedly connected to the upper side of the fixed column, a rotating column is rotatably connected between the fixed column and the upper horizontal plate through a first transmission assembly, a semicircular plate is fixedly connected to the rotating column, the left and right ends of the upper side of the semicircular plate are fixedly connected to connecting blocks, the upper side of the connecting block is fixedly connected to the first U-shaped member, the upper side of the first U-shaped member is rotatably connected to a rotating shaft through a second transmission assembly, the connecting frames are divided into two groups, and the rotating shafts are fixedly connected between the connecting frames.

[0012] Furthermore, the first transmission assembly includes an arc-shaped rack fixedly connected to the outer edge of the lower side of the semicircular plate, a motor is fixedly connected to the lower horizontal plate, and a driving gear meshing with the arc-shaped rack is fixedly connected to the output end of the motor.

[0013] Furthermore, the first U-shaped part includes a first connecting plate and a mounting shell fixedly connected to both sides of the first connecting plate, the second transmission assembly includes a dual-axis motor fixedly connected to the middle part of the upper side of the first connecting plate, the output end of the dual-axis motor is inserted into the interior of the mounting shell and is fixedly connected to a driving sprocket, and a driven sprocket is also provided on the top of the mounting shell, the driven sprocket and the driving sprocket are engaged and driven together by a chain, the middle part of the driven sprocket is fixedly connected to the rotating shaft, both ends of the rotating shaft are inserted into the mounting shell and are fixedly connected to the connecting frame.

[0014] Furthermore, the fixing column is a retractable fixing column, which includes a first section and a second section. A fastening bolt is further provided on the outer side of the first section, and the fastening bolt is threadedly connected in the threaded holes of the first section and the second section.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The first heat collecting assembly and the second heat collecting assembly are set at the same time to improve the heat collection efficiency. When the photovoltaic panel is working to generate electricity, it will generate a certain amount of heat energy. The heat generated by the heat collecting assembly is absorbed by the row pipes of the second heat collecting assembly. Specifically, cold water enters the lower header from the water inlet pipe and is then distributed to the row pipes on the lower side of each photovoltaic panel. After the cold water cools the photovoltaic panel, it is gathered in the upper header. In order to make the device have stronger heat collection performance and produce hot water with higher temperature and better quality for indoor use, the warm water gathered in the upper header enters the upper header in the first heat collecting assembly through the connecting pipe. The warm water is distributed to each heat collecting tube. While the photovoltaic panel fully absorbs solar energy, the heat collecting tube can also fully absorb solar energy to further heat the warm water. Finally, the hot water is gathered in the lower header and then transported indoors through the water outlet for residents to use.

[0017] 2. By setting up a solar tracking bracket and utilizing the first transmission assembly and the second transmission assembly, the heat-collecting power generation device can be adjusted in multiple directions according to the actual position of the sun, ensuring the perfect angle of incidence of sunlight and fully performing photoelectric and thermal conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 A schematic structural diagram of a novel PVT solar thermal power generation device provided by an embodiment of the present invention;

[0020] Figure 2 Another structural schematic diagram of the novel PVT solar thermal power generation device provided by an embodiment of the present invention;

[0021] Figure 3 A schematic structural diagram of a second heat collecting assembly provided in an embodiment of the present invention;

[0022] Figure 4 A cross-sectional schematic diagram showing the internal structure of a novel PVT solar thermal power generation device provided by an embodiment of the present invention;

[0023] Figure 5 for Figure 4 A magnified view of the structure at center A;

[0024] Figure 6Another structural schematic diagram of the novel PVT solar thermal power generation device provided by an embodiment of the present invention;

[0025] Figure 7 A schematic structural diagram of a second transmission assembly provided in an embodiment of the present invention;

[0026] Figure 8 A schematic structural diagram of a first transmission assembly provided in an embodiment of the present invention;

[0027] Figure 9 Another structural schematic diagram of the first transmission assembly provided by an embodiment of the present invention;

[0028] Figure 10 A schematic diagram of the principle of a solar thermal power generation system composed of a novel PVT solar thermal power generation device provided in an embodiment of the present invention.

[0029] The markings in the accompanying drawings are: 1. Shell; 1.1. Bottom plate; 1.2. Side plate; 2. Upper header; 3.1. Water outlet; 4. Heat collecting pipe; 5. Upper header; 6. Lower header; 7. Drain pipe; 8. Mounting hole; 9. Water inlet pipe; 10. Connecting pipe; 11. Glass cover; 12. Photovoltaic panel; 13. Insulation layer; 14. Heat conducting plate; 15. Connecting frame; 16. Rotating shaft; 17. First U-shaped member; 17 .1. First connecting plate; 17.2. Mounting housing; 18. Dual-axis motor; 19. Driving sprocket; 20. Chain; 21. Driven sprocket; 22. Connecting block; 23. Semicircular plate; 24. Arc rack; 25. Rotating column; 26. Second U-shaped member; 26.1. Second connecting plate; 26.2. Upper horizontal plate; 26.3. Lower horizontal plate; 27. Motor; 28. Driving gear; 29. ​​Fixing column; 30. Fastening bolts. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] like Figure 1-10As shown, an embodiment of the present invention provides a novel PVT solar thermal power generation device, comprising a housing 1, a first thermal collection assembly, a second thermal collection assembly, a photovoltaic panel 12, and a solar tracking bracket. The housing 1 comprises a base plate 1.1 and two side panels 1.2, each of which is fixedly connected to either side of the base plate 1.1. The first thermal collection assembly specifically comprises an upper header 2, a lower header 3, and a thermal collection pipe 4, which is fixedly connected between the upper and lower headers 2 and 3. The upper and lower headers 2 and 3 are both fixedly mounted on the upper side of the base plate 1.1 and fixedly connected to the ends of the side panels 1.2. The side panels 1.2, upper header 2, and lower header 3 together form a housing chamber on the upper side of the base plate 1.1. The second thermal collection assembly is disposed within the housing chamber, and the photovoltaic panel 12 is disposed above the second thermal collection assembly. The solar tracking bracket comprises a connecting frame 15, which is fixedly connected to the middle portion of the lower side of the base plate 1.1.

[0032] Specifically, there are multiple heat collecting tubes 4, which are arranged in parallel at equal intervals, and these heat collecting tubes 4 are all double-pass direct current all-glass vacuum tubes made of high borosilicate glass, with excellent impact resistance and good light transmittance.

[0033] like Figure 1 and 3 -6, the second heat collection assembly provided by the embodiment of the present invention specifically includes an upper header 5, a lower header 6 and a row pipe 7, and the upper header 5 and the lower header 6 are fixedly connected to the upper header 2 and the lower header 3 respectively. The row pipes 7 are arranged in multiple groups and fixedly connected between the upper header 5 and the lower header 6. The multiple groups of row pipes 7 are arranged in parallel with equal intervals. A plurality of mounting holes 8 are provided on each of the upper header 5 and the lower header 6. The mounting holes 8 are located between two adjacent groups of row pipes 7, that is, the mounting holes 8 are arranged alternately with each group of row pipes 7. Accordingly, the heat collection tubes 4 are fixedly connected to the inner side of the mounting holes 8. A glass cover plate 11 is fixedly connected to the top of the accommodating chamber, and an insulation layer 13 is fixedly connected to the bottom thereof. The insulation layer 13 can be set as an insulation layer made of materials such as rock wool, mineral wool, glass wool, polystyrene, polyurethane and phenolic resin, but is not limited thereto. The insulation layer 13 can also be made of other insulation materials.

[0034] To connect the first and second heat collection assemblies in series, a connecting pipe 10 is fixedly connected to one end of the upper header 2. The end of this connecting pipe 10, remote from the upper header 2, passes through the side panel 1.2 and is fixedly connected to one end of the upper header 5. Specifically, a water inlet pipe 9 is fixedly connected to one end of the lower header 6, and a water outlet 3.1 is also provided at one end of the lower header 3.

[0035] Specifically, each set of pipes 7 comprises a rectangular pipe, to which the photovoltaic panel 12 is fixedly connected. Furthermore, each set of pipes 7 may also comprise multiple circular pipes. In the embodiment of the present invention, each set of pipes 7 preferably comprises three circular pipes. Because the upper ends of the circular pipes are curved, they cannot perfectly fit with the photovoltaic panel 12 and fully absorb heat. Therefore, a heat conducting plate 14 is fixedly connected to the upper side of the circular pipes, and the photovoltaic panel 12 is fixedly connected to the upper side of the heat conducting plate 14. To reduce the temperature of the photovoltaic panel 12 and ensure sufficient heat exchange with the second heat collection assembly, the pipes 7 and heat conducting plate 14 are made of a metal material with good thermal conductivity, preferably copper or aluminum.

[0036] Therefore, when the photovoltaic panel 12 is working, while generating electricity, it will also generate a certain amount of heat energy, which will be absorbed by the row pipes 7 of the second heat collection assembly. Specifically, cold water enters the lower header 6 from the water inlet pipe 9, and is then distributed to the row pipes 7 on the lower side of each photovoltaic panel 12, cooling the photovoltaic panel 12 and then converging into the upper header 5; in order to make the device have stronger heat collection performance and produce hot water with higher temperature and better quality for indoor use, the warm water gathered in the upper header 5 enters the upper header 2 in the first heat collection assembly through the connecting pipe 10, and the warm water is distributed to each heat collection pipe 4. When the photovoltaic panel 12 fully absorbs solar energy, these heat collection pipes 4 can also fully absorb solar energy to further heat the warm water, and finally the hot water is gathered in the lower header 3, and then transported to the indoor bathroom or kitchen through the water outlet 3.1 for residents to use.

[0037] like Figure 2 and 7 As shown in Figure 9, the solar tracking bracket provided in this embodiment of the present invention also includes a fixed column 29 and a second U-shaped member 26. The second U-shaped member 26 specifically includes an upper transverse plate 26.2, a lower transverse plate 26.3, and a second connecting plate 26.1. The second connecting plate 26.1 is fixedly connected between the upper transverse plate 26.2 and one end of the lower transverse plate 26.3. The end of the lower transverse plate 26.3 away from the second connecting plate 26.1 is fixedly connected to the upper side of the fixed column 29. A rotating column 25 is rotatably connected between the fixed column 29 and the upper transverse plate 26.2 via a first transmission assembly. The rotating column 25 is fixedly connected to a semicircular plate 23. The left and right ends of the upper side of the semicircular plate 23 are fixedly connected to connecting blocks 22. The upper side of the connecting block 22 is fixedly connected to a first U-shaped member 17. The upper side of the first U-shaped member 17 is rotatably connected to a rotating shaft 16 via a second transmission assembly. The aforementioned connecting frame 15 is preferably provided in two groups, with the rotating shaft 16 fixedly connected between the connecting frames 15.

[0038] Specifically, such as Figure 8-9As shown, the above-mentioned first transmission assembly includes an arc-shaped rack 24, which is detachably fixedly connected to the outer edge of the lower side of the semicircular plate 23. The first transmission assembly also includes a motor 27, which is fixedly connected to the lower horizontal plate 26.3. The output end of the motor 27 is fixedly connected to a driving gear 28 that meshes with the arc-shaped rack 24.

[0039] Specifically, such as Figure 7 As shown, the first U-shaped member 17 includes a first connecting plate 17.1 and a mounting shell 17.2 fixedly connected to both sides of the first connecting plate 17.1. The above-mentioned second transmission assembly includes a dual-axis motor 18 fixedly connected to the middle part of the upper side of the first connecting plate 17.1. The output end of the dual-axis motor 18 is inserted into the interior of the mounting shell 17.2 and is fixedly connected to a driving sprocket 19. A driven sprocket 21 is also provided on the top of the mounting shell 17.2. The driven sprocket 21 and the driving sprocket 19 are engaged and driven together by a chain 20. The middle part of the driven sprocket 21 is fixedly connected to the rotating shaft 16. Both ends of the rotating shaft 16 are inserted into the mounting shell 17.2 and are fixedly connected to the connecting frame 15.

[0040] Therefore, the arrangement of the first transmission assembly and the second transmission assembly in the solar tracking bracket can enable the thermal power generation device to rotate left and right and up and down, and adjust according to the actual position of the sun to ensure the perfect angle of incidence of sunlight and fully realize the photoelectric and thermal conversion.

[0041] In particular, in order to facilitate the adjustment of the installation height of the solar power generation device, the fixing column 29 can be set as a retractable fixing column. Specifically, the fixing column 29 can include a first section and a second section. A fastening bolt 30 is also provided on the outside of the first section. The fastening bolt 30 is threadedly connected to the threaded holes of the first section and the second section. After adjusting the installation height of the device, it is fixed with the fastening bolt 30.

[0042] like Figure 10 As shown, the novel PVT solar thermal power generation device provided in an embodiment of the present invention forms a solar thermal power generation system, which specifically includes a solar thermal collection system and a solar power generation system. Specifically, the hot water generated by the solar thermal collection system (first and second thermal collection assemblies) can be supplied to indoor bathrooms and kitchens for residents' use; while the electrical energy generated by the solar power generation system (photovoltaic panels 12) can be stored in batteries or directly transmitted indoors via an inverter, where it is electrically connected to various loads, such as lighting, air conditioners, refrigerators, and other household appliances.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A new type of PVT solar thermal power generation device, characterized in that: The invention comprises a housing (1), a first heat collecting assembly, a second heat collecting assembly, a photovoltaic cell panel (12) and a solar tracking bracket, wherein the housing (1) comprises a bottom plate (1.1) and side plates (1.2) fixedly connected to both sides of the bottom plate (1.1), the first heat collecting assembly comprises an upper header (2), a lower header (3) and a heat collecting pipe (4), the heat collecting pipe (4) is fixedly connected between the upper header (2) and the lower header (3), and the upper header (2) and the lower header (3) are arranged The solar tracking bracket comprises a connecting frame (15) and a connecting frame (15) fixedly connected to the middle portion of the lower side of the bottom plate (1.1); the side plate (1.2), the upper connecting box (2) and the lower connecting box (3) are enclosed on the upper side of the bottom plate (1.1) to form a receiving chamber; the second heat collecting assembly is arranged inside the receiving chamber; the photovoltaic cell panel (12) is arranged on the upper side of the second heat collecting assembly; and the solar tracking bracket comprises a connecting frame (15); the connecting frame (15) is fixedly connected to the middle portion of the lower side of the bottom plate (1.1); The second heat collecting assembly comprises an upper header (5), a lower header (6) and a row pipe (7), wherein the upper header (5) and the lower header (6) are fixedly connected to the upper header (2) and the lower header (3) respectively, and the row pipe (7) is fixedly connected between the upper header (5) and the lower header (6), and the row pipe (7) is a plurality of groups, and the plurality of groups of the row pipes (7) are arranged in parallel at equal intervals, and the upper header (5) and the lower header (6) are both provided with a plurality of mounting holes (8), and the mounting holes (8) are all located between two adjacent groups of row pipes (7). The heat collecting pipe (4) is fixedly connected to the inner side of the mounting hole (8), the top and bottom of the accommodating chamber are fixedly connected to a glass cover plate (11) and a heat-insulating layer (13), respectively. One end of the upper header (2) is fixedly connected to a connecting pipe (10), and the end of the connecting pipe (10) away from the upper header (2) passes through the side plate (1.2) and is fixedly connected to one end of the upper header (5). One end of the lower header (6) is fixedly connected to a water inlet pipe (9), and one end of the lower header (3) is also provided with a water outlet (3.1).

2. The novel PVT solar thermal power generation device according to claim 1 is characterized in that: There are a plurality of heat collecting tubes (4), which are arranged in parallel at equal intervals and are all double-pass direct-flow all-glass vacuum tubes.

3. The novel PVT solar thermal power generation device according to claim 1 is characterized in that: Each group of the pipes (7) comprises a rectangular pipe, and the photovoltaic panel (12) is fixedly connected to the upper side of the rectangular pipe.

4. The novel PVT solar thermal power generation device according to claim 1 is characterized in that: Each group of the pipes (7) comprises three circular pipes, a heat conducting plate (14) is fixedly connected to the upper side of the circular pipes, and the photovoltaic panels (12) are fixedly connected to the upper side of the heat conducting plate (14).

5. The novel PVT solar thermal power generation device according to claim 1 is characterized in that: The solar tracking bracket further comprises a fixing column (29) and a second U-shaped member (26), wherein the second U-shaped member (26) comprises an upper transverse plate (26.2), a lower transverse plate (26.3) and a second connecting plate (26.1), wherein the second connecting plate (26.1) is fixedly connected between the upper transverse plate (26.2) and one end of the lower transverse plate (26.3), and an end of the lower transverse plate (26.3) away from the second connecting plate (26.1) is fixedly connected to the upper side of the fixing column (29), and the fixing column (29) and the upper transverse plate (26 .2) are rotatably connected to a rotating column (25) through a first transmission component, a semicircular plate (23) is fixedly connected to the rotating column (25), both left and right ends of the upper side of the semicircular plate (23) are fixedly connected to connecting blocks (22), the upper side of the connecting block (22) is fixedly connected to a first U-shaped member (17), the upper side of the first U-shaped member (17) is rotatably connected to a rotating shaft (16) through a second transmission component, the connecting frame (15) is divided into two groups, and the rotating shaft (16) is fixedly connected between the connecting frames (15).

6. The novel PVT solar thermal power generation device according to claim 5, characterized in that: The first transmission assembly comprises an arc-shaped rack (24) fixedly connected to the outer edge of the lower side of the semicircular plate (23); a motor (27) is fixedly connected to the lower transverse plate (26.3); and a driving gear (28) meshing with the arc-shaped rack (24) is fixedly connected to the output end of the motor (27).

7. The novel PVT solar thermal power generation device according to claim 5, characterized in that: The first U-shaped member (17) includes a first connecting plate (17.1) and a mounting shell (17.2) fixedly connected to both sides of the first connecting plate (17.1). The second transmission assembly includes a dual-axis motor (18) fixedly connected to the middle of the upper side of the first connecting plate (17.1). The output end of the dual-axis motor (18) is inserted into the interior of the mounting shell (17.2) and is fixedly connected to a driving sprocket (19). A driven sprocket (21) is also provided on the top of the mounting shell (17.2). The driven sprocket (21) and the driving sprocket (19) are meshed and driven together by a chain (20). The middle of the driven sprocket (21) is fixedly connected to the rotating shaft (16). Both ends of the rotating shaft (16) are inserted into the mounting shell (17.2) and are fixedly connected to the connecting frame (15).

8. The novel PVT solar thermal power generation device according to claim 5, characterized in that: The fixing column (29) is a telescopic fixing column, and the fixing column (29) comprises a first section and a second section. A fastening bolt (30) is further provided on the outside of the first section, and the fastening bolt (30) is threadedly connected in the threaded holes of the first section and the second section.

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