Hot air circulation flow guide pipeline structure for deicing fan blades

Abstract

The utility model discloses a hot air circulation flow guide pipeline structure for deicing fan blades. The hot air circulation flow guide pipeline structure comprises a tower drum, a cabin is fixedly arranged at the upper end of the tower; a mounting groove is formed in the end of the cabin; a fixed joint and a rotary joint are arranged in the mounting groove; the rotating joint is fixedly connected with three blades in a circumferential array; when icing or snow accumulation occurs on the surface of the fan blade in a low-temperature environment, hot air is input into the first flow guide pipelines, the second flow guide pipelines and the third flow guide pipelines through the hot air generator, the first flow guide pipelines and the second flow guide pipelines are distributed on the edge of the blade, and the multiple third flow guide pipelines are located in the middle of the blade; therefore, when hot air passes through the first flow guide pipeline, the second flow guide pipeline and the third flow guide pipeline, heat can be continuously conveyed to the blades, so that ice or accumulated snow on the blades is quickly melted, and normal operation of the fan is prevented from being influenced.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine de-icing technology, specifically, it relates to a hot gas circulation guide pipe structure for wind turbine blade de-icing. Background Technology

[0002] Wind turbine blades are key components of wind turbine generators, typically made of lightweight, high-strength composite materials, and feature a streamlined aerodynamic shape. They are used to capture wind energy and convert it into mechanical energy. Modern blades can reach lengths of over 100 meters, and their design balances strength, lightweighting, and fatigue resistance to withstand the long-term challenges of complex natural environments. The operating efficiency of the blades directly affects power generation; therefore, their surface morphology and structural stability are crucial.

[0003] Wind turbine blade icing primarily occurs in low-temperature, high-humidity environments, such as winters in cold regions or high-altitude areas. When the temperature is below freezing and the air contains supercooled water droplets or moisture, the water droplets will quickly condense into ice upon contact with the blade surface. Furthermore, the intense friction between the blades and the low-temperature airflow during high-speed rotation further lowers the surface temperature, exacerbating icing. Even minute roughness or structural defects on the blade surface can become nuclei for ice crystal growth, forming different types of icing such as frost, rime, or hoarfrost, leading to the gradual accumulation of ice layers.

[0004] Ice accumulation significantly increases blade weight and disrupts aerodynamic shape, reducing power generation efficiency and even forcing the unit to shut down. Uneven ice distribution can also cause blade vibration and structural overload, leading to safety accidents such as breakage or collapse. Therefore, timely and rapid de-icing of wind turbine blades is crucial for their normal operation. Utility Model Content

[0005] To address the technical problem of icing on wind turbine blades in low-temperature and high-humidity environments, which affects the normal operation of wind turbines, this utility model provides a hot gas circulation guide pipe structure for de-icing wind turbine blades.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A hot air circulation guide pipe structure for de-icing wind turbine blades includes a tower; a nacelle is fixedly installed at the upper end of the tower; an installation groove is provided at the end of the nacelle; a fixed joint and a rotating joint are provided in the installation groove; three blades in a circumferential array are fixedly connected to the rotating joint; a first guide pipe and a second guide pipe are provided inside the blade along the length direction, and the first guide pipe and the second guide pipe are interconnected and located at the edge of the blade; a plurality of third guide pipes are also provided inside the blade along the width direction, and the two ends of the third guide pipes are respectively connected to the first guide pipe and the second guide pipe.

[0008] Furthermore, the fixed joint is fixedly connected to the engine compartment; the rotary joint is rotatably connected to the engine compartment; and the fixed joint and the rotary joint are rotatably connected.

[0009] Furthermore, a connecting shaft is fixedly connected to the center of the side of the rotary joint; a through circular hole is opened at the center of the fixed joint; the connecting shaft is inserted into the circular hole and connected to the shaft of the gearbox.

[0010] Furthermore, the fixed joint has a platform structure; a tapered groove is provided inside the rotating joint near the connecting shaft, and the fixed joint is located inside the tapered groove.

[0011] Furthermore, the ends of the first and second guide pipes are connected to the conical groove.

[0012] Furthermore, the fixed joint has a first annular groove on its side corresponding to the end of the first guide pipe and a second annular groove on its side corresponding to the second guide pipe; the fixed joint has an axially formed second air outlet channel inside, which communicates with the first annular groove; the fixed joint also has an axially formed second air inlet channel inside, which communicates with the second annular groove.

[0013] Furthermore, a hot air generator is fixedly installed on the upper part of the cabin; a first air outlet channel is opened on the end face of the cabin, which is L-shaped and connected to a second air outlet channel and the input end of the hot air generator at both ends respectively; a first air inlet channel is also opened on the end face of the cabin, which is L-shaped and connected to a second air inlet channel and the output end of the hot air generator at both ends respectively.

[0014] The beneficial effects of this utility model are:

[0015] 1. When the surface of the fan blades freezes or accumulates snow in a low-temperature environment, the present invention inputs hot air into the first guide pipe, the second guide pipe, and the third guide pipe through a hot air generator. Since the first and second guide pipes are distributed at the edge of the blades and the multiple third guide pipes are located in the middle of the blades, the hot air will continuously deliver heat to the blades as it passes through the first, second, and third guide pipes, thereby causing the ice or snow on the blades to melt quickly and avoiding affecting the normal operation of the fan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3 This is a cross-sectional view of the present invention;

[0019] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0020] Figure 5 This is a cross-sectional view of the blade in this utility model;

[0021] Figure 6 This is a cross-sectional view of the fixed joint in this utility model;

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Tower; 2. Nacelle; 3. Mounting slot; 4. Hot air generator; 5. Fixed joint; 6. Rotary joint; 7. Blade; 8. First air outlet duct; 9. First air inlet duct; 10. Conical groove; 11. Connecting shaft; 12. First guide pipe; 13. Second guide pipe; 14. Third guide pipe; 15. Circular hole; 16. First annular groove; 17. Second annular groove; 18. Second air outlet duct; 19. Second air inlet duct. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-3 As shown, a hot air circulation guide pipe structure for de-icing wind turbine blades includes a tower 1; a nacelle 2 is fixedly installed at the upper end of the tower 1, which is used to integrate a gearbox, generator, yaw system, cooling system and control system; an installation groove 3 is opened at the end of the nacelle 2; a fixed joint 5 and a rotating joint 6 are provided in the installation groove 3; the fixed joint 5 is fixedly connected to the nacelle 2; the rotating joint 6 is rotatably connected to the nacelle 2; and the fixed joint 5 and the rotating joint 6 are rotatably connected.

[0026] Please refer to it again. Figures 3-4 As shown, a connecting shaft 11 is fixedly connected to the center of the side of the rotary joint 6; a through circular hole 15 is opened in the center of the fixed joint 5; the connecting shaft 11 is inserted into the circular hole 15 and connected to the shaft of the gearbox.

[0027] Please refer to it again. Figures 5-6 As shown, the fixed joint 5 has a platform structure; the rotating joint 6 has a tapered groove 10 near the connecting shaft 11, and the fixed joint 5 is located inside the tapered groove 10.

[0028] Please refer to it again. Figures 4-5 As shown, three blades 7 in a circumferential array are fixed to the rotary joint 6; a first guide pipe 12 and a second guide pipe 13 are formed inside the blade 7 along the length direction, and the first guide pipe 12 and the second guide pipe 13 are interconnected and located at the edge of the blade 7; a plurality of third guide pipes 14 are also formed inside the blade 7 along the width direction, and the two ends of the third guide pipes 14 are connected to the first guide pipe 12 and the second guide pipe 13 respectively; the ends of the first guide pipe 12 and the second guide pipe 13 are connected to the conical groove 10.

[0029] Please refer to it again. Figures 4-6 As shown, a first annular groove 16 is provided on the side of the fixed joint 5 at the position corresponding to the end of the first guide pipe 12, and a second annular groove 17 is provided at the position corresponding to the second guide pipe 13; a second air outlet channel 18 is provided axially inside the fixed joint 5, which communicates with the first annular groove 16; a second air inlet channel 19 is also provided axially inside the fixed joint 5, which communicates with the second annular groove 17.

[0030] Please refer to it again. Figures 3-4 As shown, a hot air generator 4 is fixedly installed on the upper part of the cabin 2. The model of the hot air generator 4 is Leister LE 5000HT, which is used to deliver hot air into the first guide pipe 12, the second guide pipe 13 and the third guide pipe 14. A first air outlet channel 8 is opened on the end face of the cabin 2. The first air outlet channel 8 is L-shaped and its two ends are respectively connected to the second air outlet channel 18 and the input end of the hot air generator 4. A first air inlet channel 9 is also opened on the end face of the cabin 2. The first air inlet channel 9 is L-shaped and its two ends are respectively connected to the second air inlet channel 19 and the output end of the hot air generator 4.

[0031] To facilitate understanding of the above-mentioned technical solution of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below:

[0032] Under normal operating conditions, the fixed joint 5 is connected to the nacelle 2 by screws, and the rotating joint 6 is connected to the nacelle 2 by the connecting shaft 11. The blades 7 rotate under the action of wind, thereby driving the connecting shaft 11 to rotate. The connecting shaft 11 is driven by the generator through the gearbox to achieve the purpose of wind power generation.

[0033] When the surface of the fan blades 7 freezes or accumulates snow in a low-temperature environment, hot air is supplied to the first air inlet channel 9 through the hot air generator 4. The hot air then passes through the second air inlet channel 19 and the second annular groove 17 into the first guide pipe 12. The hot air inside the first guide pipe 12 is directly input into the second guide pipe 13, or input into the second guide pipe 13 through the third guide pipe 14. After that, it is transported to the first annular groove 16 through the second guide pipe 13, and finally passes through the second air outlet channel 18 and the first air outlet channel 8 to re-enter the hot air generator 4, thus achieving the purpose of circulating heating. The specific hot air delivery path is as follows:

[0034] Hot air generator 4 output terminal → first air inlet channel 9 → second air inlet channel 19 → second annular groove 17 → first guide pipe 12 → second guide pipe 13 → first annular groove 16 → second air outlet channel 18 → first air outlet channel 8 → hot air generator 4 output terminal;

[0035] Alternatively, the output end of the hot air generator 4 → the first air inlet channel 9 → the second air inlet channel 19 → the second annular groove 17 → the first guide pipe 12 → the third guide pipe 14 → the second guide pipe 13 → the first annular groove 16 → the second air outlet channel 18 → the first air outlet channel 8 → the output end of the hot air generator 4.

[0036] Since the first guide pipe 12 and the second guide pipe 13 are distributed at the edge of the blade 7, and multiple third guide pipes 14 are located in the middle of the blade 7, when hot air passes through the first guide pipe 12, the second guide pipe 13 and the third guide pipe 14, it will continuously deliver heat to the blade 7, thereby melting the ice or snow on the blade 7 and avoiding affecting the normal operation of the fan.

[0037] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A hot gas circulation guide pipe structure for de-icing wind turbine blades, comprising a tower (1); a nacelle (2) is fixedly disposed at the upper end of the tower (1); characterized in that: The engine compartment (2) has an installation slot (3) at one end; a fixed joint (5) and a rotating joint (6) are provided in the installation slot (3); The rotary joint (6) is fixed with three blades (7) arranged in a circumferential array; a first guide pipe (12) and a second guide pipe (13) are provided inside the blade (7) along the length direction, and the first guide pipe (12) and the second guide pipe (13) are connected to each other and located at the edge of the blade (7); a plurality of third guide pipes (14) are also provided inside the blade (7) along the width direction, and the two ends of the third guide pipes (14) are connected to the first guide pipe (12) and the second guide pipe (13) respectively.

2. The hot gas circulation guide pipe structure for de-icing wind turbine blades according to claim 1, characterized in that: The fixed joint (5) is fixedly connected to the cabin (2); the rotating joint (6) is rotatably connected to the cabin (2); the fixed joint (5) and the rotating joint (6) are rotatably connected.

3. The hot gas circulation guide pipe structure for de-icing wind turbine blades according to claim 2, characterized in that: The rotating joint (6) has a connecting shaft (11) fixedly connected to the center of its side; the fixed joint (5) has a through hole (15) at its center; the connecting shaft (11) is inserted into the hole (15) and connected to the shaft of the gearbox.

4. The hot gas circulation guide pipe structure for de-icing wind turbine blades according to claim 3, characterized in that: The fixed joint (5) has a platform structure; the rotating joint (6) has a tapered groove (10) located near the connecting shaft (11), and the fixed joint (5) is located inside the tapered groove (10).

5. The hot gas circulation guide pipe structure for de-icing wind turbine blades according to claim 4, characterized in that: The ends of the first guide pipe (12) and the second guide pipe (13) are connected to the conical groove (10).

6. The hot gas circulation guide pipe structure for de-icing wind turbine blades according to claim 5, characterized in that: The fixed joint (5) has a first annular groove (16) on its side corresponding to the end of the first guide pipe (12), and a second annular groove (17) on its side corresponding to the end of the second guide pipe (13); The fixed joint (5) has a second air outlet channel (18) axially opened inside, which is connected to the first annular groove (16); the fixed joint (5) also has a second air inlet channel (19) axially opened inside, which is connected to the second annular groove (17).

7. The hot gas circulation guide pipe structure for de-icing wind turbine blades according to claim 6, characterized in that: A hot air generator (4) is fixedly installed on the upper part of the cabin (2); The engine compartment (2) has a first air outlet channel (8) on its end face. The first air outlet channel (8) is L-shaped and its two ends are connected to the second air outlet channel (18) and the input end of the hot air generator (4), respectively. The end face of the cabin (2) is also provided with a first air intake channel (9), which is L-shaped and connected at both ends to the second air intake channel (19) and the output end of the hot air generator (4).

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