Wind power blade hot air deicing device with temperature protection function

Abstract

The invention relates to the technical field of wind driven generators, and discloses a wind power blade hot air deicing device with a temperature protection function, which comprises a rack, a cabin arranged at the top of the rack, a blade platform arranged in front of the cabin, a rotating blade arranged on the outer side of the blade platform and a heating assembly, and the rotating blade comprises a front edge, a rear edge, a blade tip and a blade tail. The heating assembly specifically comprises a heating pipeline and a backflow pipeline which are arranged in the rotating blade. According to the wind power blade hot air deicing device with the temperature protection function, by arranging the heating assembly and the hot air unit, hot air is blown in from the heating pipeline and then returns to the hot air unit through the backflow pipeline, so that heat is transferred to the rotating blade through the heating pipeline and the backflow pipeline, and an ice layer on the outer side of the rotating blade is melted; therefore, the ice layer is prevented from influencing the wind energy capturing efficiency of the rotating blade and reducing the power generation efficiency of equipment, and the service life of the rotating blade is also prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generators, and in particular to a hot air deicing device for wind turbine blades with a temperature protection function. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy. Its core principle is to use wind power to drive the wind wheel to rotate, and the wind wheel drives the generator rotor to rotate. According to the law of electromagnetic induction, an induced electromotive force is generated in the stator winding of the generator. When the stator winding is connected to the external power grid, current will be generated, thereby realizing the conversion of wind energy into electrical energy. For example, when the wind blows through the blades of the wind wheel, the airflow speed above and below the blades is different due to the airfoil design. According to Bernoulli's principle, a pressure difference is generated on the upper and lower surfaces. This pressure difference causes the blades to be lifted, driving the wind wheel to rotate.

[0003] A circulating hot air deicing device for wind power is disclosed in the patent with patent publication number CN217976474U, including a wind turbine blade, a mounting plate is fixedly installed on the front side of the inner cavity of the wind turbine blade, an air pump is fixedly installed on the front side of the upper surface of the mounting plate, a gas heating device is fixedly installed on the rear side of the upper surface of the mounting plate, an air supply pipe is fixedly installed in the inner cavity of the wind turbine blade, an ultrasonic transmitter is installed in the inner cavity of the wind turbine blade, and ice attached to the surface of the wind turbine blade can be vibrated and removed by the ultrasonic transmitter. By arranging the air pump and the gas heating device to be installed at the root of the wind turbine blade, the air supply pipe is S-shaped and attached to the inner wall of the wind turbine blade and extends to the tip of the wind turbine blade, the tip of the wind turbine blade can be better heated, the heating of the entire wind turbine blade is made more uniform, the residence time of the hot air in the inner cavity of the blade is prolonged, and the air supply and heating power consumption of the gas heating device are also reduced.

[0004] The prior art has the following defects:

[0005] Since most wind turbines are built in high and windy areas, when the ambient temperature is below 0℃ and the humidity in the air is high, the blades of the wind turbines are very easy to freeze. After freezing, the surface shape of the blades changes, the airfoil is damaged, and the wind energy capture efficiency is greatly reduced. At the same time, the resistance of the wind turbine increases and the starting wind speed increases, which seriously affects the power generation. The ice layer increases the load on the blades, causing fatigue damage, which may cause cracks, deformation or even breakage of the blades.

[0006] Affected by the shape and size of wind turbine blades, the leading edge of the blades and other areas under the impact of airflow become high-incidence areas for water droplets to gather and freeze; at the same time, the higher the rotation speed at the tip of the wind turbine blade, the lower the air pressure at the tip, the faster the water vapor may gather, and ice is more likely to occur; due to the above reasons, the ice layer on the surface of the wind turbine blades is uneven, which increases the difficulty of de-icing. Summary of the invention

[0007] In view of the problem that blades of wind turbines are very easy to freeze in the prior art, a hot air deicing device for wind turbine blades with a temperature protection function is proposed.

[0008] The present application provides a hot air deicing device for wind turbine blades with a temperature protection function, the purpose of which is to remove ice layers on the outside of wind turbine blades.

[0009] The technical solution of the present invention is: a hot air deicing device for wind turbine blades with a temperature protection function, comprising a frame, a cabin arranged on the top of the frame, a blade platform arranged in front of the cabin, and a rotating blade arranged outside the blade platform, wherein the rotating blade comprises a leading edge, a trailing edge, a blade tip, and a blade tail, and further comprises a heating component, wherein the heating component specifically comprises a heating pipe and a return pipe arranged in the rotating blade;

[0010] The heating pipe is laid on the inner wall of the leading edge, the return pipe is laid on the inner wall of the trailing edge, the heating pipe and the return pipe are connected at the blade tip, and the heating pipe and the return pipe extend from the blade tail.

[0011] Furthermore, the heating pipe is laid in a coiled manner and gradually becomes sparse from the blade tail to the blade tip.

[0012] Furthermore, the heating component also includes a straight-through pipe arranged in the rotating blade, the straight-through pipe is laid on the inner wall of the leading edge, and a jump bridge is arranged at the intersection of the straight-through pipe and the heating pipe.

[0013] Furthermore, the heating assembly also includes an embedding hole opened on the inner wall of the front edge, an inner embedded plate and an outer sleeve arranged inside the embedding hole, a mounting hole arranged on the surface of the inner embedded plate, an electric telescopic rod arranged inside the mounting hole, a heating interface and a straight-through interface arranged on the outside of the outer sleeve, an adjustment inner core arranged inside the outer sleeve, an upper notch, a lower notch and a connecting hole arranged on the outside of the adjustment inner core, and a jack arranged on one end of the adjustment inner core close to the inner embedded plate;

[0014] A sensor is arranged in the inner panel, one end of the electric telescopic rod away from the inner panel is threadedly connected to the socket, the upper notch is connected to the lower notch, the connecting hole is connected to the upper notch, the heating pipe is connected to the openings at both ends of the straight-through interface, the jump bridge is connected to the openings at both ends of the heating interface, and the heating interface is connected to the connecting hole.

[0015] Furthermore, the upper notch is butted against an end of the heating pipe close to the blade tail, and the lower notch is butted against an end of the jump bridge close to the blade tail.

[0016] Furthermore, a filter assembly is also provided in the rotating blade, and the filter assembly is located in the blade tail and closes the opening of the blade tail.

[0017] Furthermore, the filter assembly specifically includes two limit platforms arranged in the blade tail, an outer shell arranged between the two limit platforms, an inner liner arranged inside the outer shell, a filter membrane arranged inside the inner liner, a through hole opened at the center of the limit platform, and a side opening opened on the outside of the outer shell; the heating assembly also includes an internal pipe and an external pipe.

[0018] A groove is arranged on one side of the limit platform close to the shell, through holes penetrate into the lining from both ends, and the inner pipe and the outer pipe penetrate the through holes and are distributed at both ends of the filter membrane.

[0019] Furthermore, the filter assembly further comprises a water leakage hole arranged on the outer side of the liner;

[0020] The outer shell and the inner liner are both spherical, a water storage space is arranged between the outer shell and the inner liner, and the water leakage hole communicates the water storage space and the inner space of the inner liner.

[0021] Beneficial effects of the present invention:

[0022] 1. By setting a heating component, when ice forms on the outside of the rotating blades, the hot air unit blows hot air in from the heating pipe, and then returns to the hot air unit through the return pipe. In this way, the heat is transferred to the rotating blades through the heating pipe and the return pipe, so that the ice layer on the outside of the rotating blades melts. This prevents the ice layer from affecting the wind energy capture efficiency of the rotating blades, reducing the power generation efficiency of the equipment, and extending the service life of the rotating blades. At the same time, the heating pipe is coiled, so that the hot air flows longer at the leading edge, which can better exchange heat energy and keep more heat at the leading edge, which can achieve a better deicing effect.

[0023] 2. By setting up a straight-through pipe, according to the distribution of ice on the outside of the leading edge sensed by the sensor, hot air flows from the heating pipe where deicing is needed, and flows into the straight-through pipe where deicing is not needed. In this way, more heat in the hot air is retained in the required area, which can avoid heat waste, achieve better deicing effect, and reduce energy consumption.

[0024] 3. By setting up a filter component, the external pipe inputs the hot air into the inner lining. After the filter diaphragm filters the particles and water vapor in the hot air, the pure hot air is input into the straight pipe through the internal pipe. This can prevent particles and water vapor from entering the heating pipe, return pipe and straight pipe. The heating pipe, return pipe and straight pipe will not be corroded by particles and water vapor, and the thermal conductivity efficiency can be maintained for a long time, and the service life can also be extended. At the same time, the water vapor collected by the filter diaphragm falls into the inner lining and enters the water storage space, which can prevent water from entering the external pipe or the internal pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A three-dimensional diagram of a hot air deicing device for wind turbine blades with a temperature protection function according to the present invention;

[0026] Figure 2 It is a schematic diagram of the rotating blade of the present invention;

[0027] Figure 3 It is a schematic diagram of the interior of the rotating blade of the present invention;

[0028] Figure 4 It is a schematic diagram of the heating component of the present invention;

[0029] Figure 5 For the present invention Figure 3 Enlarged view of point A in the middle;

[0030] Figure 6 For the present invention Figure 4 Middle partial enlarged picture;

[0031] Figure 7 It is an enlarged view of the heating component of the present invention;

[0032] Figure 8 This is a disassembled diagram of the heating assembly of the present invention;

[0033] Fig. 9 For the present invention Figure 8 Schematic diagram of perspective flipping;

[0034] Fig.10 It is a plan view of the rotating blade of the present invention;

[0035] Fig.11 For the present invention Fig.10 Middle AA section view;

[0036] Fig.12 For the present invention Fig.10 Middle BB section view;

[0037] Fig.13 For the present invention Fig.12 A magnified view of the filter assembly;

[0038] Fig.14 This is a disassembled diagram of the filter assembly of the present invention;

[0039] Fig.15 This is a schematic diagram of the interior of the liner of the present invention.

[0040] In the figure:

[0041] 1. Frame; 2. Nacelle; 3. Blade platform; 4. Rotating blade; 41. Leading edge; 42. Trailing edge; 43. Blade tip; 44. Blade tail; 5. Heating component; 51. Heating pipe; 52. Return pipe; 53. Straight pipe; 54. Jump bridge; 55. Embedded hole; 56. Inlaid plate; 57. Mounting hole; 58. Electric telescopic rod; 59. Adjustment core; 510. Upper notch; 511. Lower notch; 512. Connecting hole; 513. Outer sleeve; 514. Heating interface; 515. Straight interface; 516. Socket; 517. Internal pipe; 518. External pipe; 6. Filter component; 61. Limiting platform; 62. Outer shell; 63. Lining; 64. Filter membrane; 65. Leakage hole; 66. Through hole; 67. Side opening. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0043] Example 1, reference Figure 1-Figure 12 , which is the first embodiment of the present invention, provides a wind turbine blade hot air deicing device with a temperature protection function, including a frame 1, a nacelle 2 arranged on the top of the frame 1, a blade platform 3 arranged in front of the nacelle 2, and a rotating blade 4 arranged on the outside of the blade platform 3. The rotating blade 4 includes a leading edge 41, a trailing edge 42, a blade tip 43, and a blade tail 44. It also includes a heating component 5. The heating component 5 specifically includes a heating pipe 51 and a return pipe 52 arranged in the rotating blade 4.

[0044] Specifically, the frame 1 is fixed to the ground, the cabin 2 is welded to the frame 1, the blade platform 3 is rotatably connected to the cabin 2, the rotating blade 4 is fixed to the blade platform 3 by bolts, a hot air unit is arranged inside the blade platform 3, the heating assembly 5 is connected to the hot air blower, the heating pipe 51 is laid on the inner wall of the leading edge 41, the return pipe 52 is laid on the inner wall of the trailing edge 42, the heating pipe 51 and the return pipe 52 are connected at the blade tip 43, and the heating pipe 51 and the return pipe 52 extend from the blade tail 44; the heating pipe 51 adopts a coiled laying method, and gradually becomes sparse from the blade tail 44 to the blade tip 43.

[0045] By setting up the heating component 5, when ice forms on the outside of the rotating blade 4, the hot air unit blows in hot air from the heating pipe 51, and then returns to the hot air unit through the return pipe 52, so that the heat is transferred to the rotating blade 4 through the heating pipe 51 and the return pipe 52, so that the ice layer on the outside of the rotating blade 4 melts, thereby preventing the ice layer from affecting the wind energy capture efficiency of the rotating blade 4, reducing the power generation efficiency of the equipment, and extending the service life of the rotating blade 4. At the same time, the heating pipe 51 is coiled, so that the flow time of the hot air at the leading edge 41 is prolonged, which can better exchange heat energy and leave more heat at the leading edge 41, which can achieve a better deicing effect.

[0046] The heating assembly 5 also includes a straight-through pipe 53 arranged in the rotating blade 4, the straight-through pipe 53 is laid on the inner wall of the leading edge 41, a jump bridge 54 is arranged at the intersection of the straight-through pipe 53 and the heating pipe 51, and the heating pipe 51 and the straight-through pipe 53 are connected at both ends; an embedding hole 55 opened on the inner wall of the leading edge 41, an inner plate 56 and an outer sleeve 513 arranged inside the embedding hole 55, a mounting hole 57 arranged on the surface of the inner plate 56, an electric telescopic rod 58 arranged inside the mounting hole 57, a heating interface 514 and a straight-through interface 515 arranged on the outside of the outer sleeve 513, an adjusting inner core 59 arranged inside the outer sleeve 513, an upper notch 510, a lower notch 511 and a connecting hole 512 arranged on the outside of the adjusting inner core 59, and a plug hole 516 arranged on one end of the adjusting inner core 59 close to the inner plate 56.

[0047] Specifically, the inner panel 56 is threadedly connected to the embedding hole 55, and a sensor is provided in the inner panel 56. The sensor can sense the ice coverage on the outer side of the leading edge 41 through infrared rays or temperature. The electric telescopic rod 58 is threadedly connected to the mounting hole 57, and the end of the electric telescopic rod 58 away from the inner panel 56 is threadedly connected to the insertion hole 516. The electric telescopic rod 58 is slidably inserted in the outer sleeve 513, and the outer sleeve 513 and the inner panel 56 are fixed by bolts. The upper notch 510 is connected to the lower notch 511, and the connecting hole 512 is connected to the upper notch 510. The heating pipe 51 is connected to the openings at both ends of the straight-through interface 515, and the jumping bridge 54 is connected to the openings at both ends of the heating interface 514. The heating interface 514 is connected to the connecting hole 512, the upper end notch 510 is connected to the end of the heating pipe 51 close to the blade tail 44, and the lower end notch 511 is connected to the end of the jumping bridge 54 close to the blade tail 44.

[0048] By setting up the straight pipe 53, according to the distribution of ice layer on the outside of the leading edge 41 sensed by the sensor, hot air flows from the heating pipe 51 where deicing is needed, and flows into the straight pipe 53 where deicing is not needed. In this way, more heat in the hot air is retained in the required area, which can avoid heat waste, achieve better deicing effect, and reduce energy consumption.

[0049] Example 2, reference Figure 1-Figure 7 and Figure 10-Figure 15 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that a filter assembly 6 is further provided in the rotating blade 4 , and the filter assembly 6 is located in the blade tail 44 and closes the opening of the blade tail 44 .

[0050] The filter assembly 6 specifically includes two limit platforms 61 arranged in the blade tail 44, an outer shell 62 arranged between the two limit platforms 61, an inner lining 63 arranged inside the outer shell 62, a filter membrane 64 arranged inside the inner lining 63, a through hole 66 opened at the center of the limit platform 61, and a side opening 67 opened on the outer side of the outer shell 62; the heating assembly 5 also includes an internal pipe 517 and an external pipe 518; the filter assembly 6 also includes a water leakage hole 65 arranged on the outer side of the inner lining 63.

[0051] Specifically, the limit platform 61 is fixed in the front edge 41 by bolts, and a groove is provided on one side of the limit platform 61 close to the outer shell 62, and the outer shell 62 is embedded in the groove. The through hole 66 penetrates from both ends to the inner lining 63, and the inner pipe 517 and the outer pipe 518 penetrate the through hole 66 and are distributed at both ends of the filter diaphragm 64. The filter diaphragm 64 can filter particulate matter and water vapor. The limit platform 61, the outer shell 62, and the inner lining 63 are all threadedly connected with the inner pipe 517 or the outer pipe 518. The inner pipe 517 and the outer pipe 518 are located at the inner and outer ends of the filter diaphragm 64. One end in the liner 63 is distributed on both sides of the center of the filter diaphragm 64; the outer shell 62 and the inner liner 63 are both spherical, and the outer shell 62 and the inner liner 63 are both composed of two hemispheres. A water storage space is set between the outer shell 62 and the inner liner 63, and the leakage hole 65 connects the water storage space and the internal space of the liner 63. The side opening 67 extends to both sides of the process limit platform 61. The leakage hole 65 is conical, and the opening is narrow at one end close to the filter diaphragm 64 and wide at the other end to prevent the accumulated water entering the outer shell 62 from flowing back into the liner 63.

[0052] By setting up the filter component 6, the external pipe 518 inputs the hot air into the inner lining 63, and the filter diaphragm 64 filters the particulate matter and water vapor in the hot air, and then the pure hot air is input into the straight pipe 53 through the internal pipe 517, so that the particulate matter and water vapor can be prevented from entering the heating pipe 51, the return pipe 52 and the straight pipe 53. The heating pipe 51, the return pipe 52 and the straight pipe 53 will not be corroded by the particulate matter and water vapor, the thermal conductivity efficiency can be maintained for a long time, and the service life can also be extended; at the same time, the water vapor collected by the filter diaphragm 64 falls into the inner lining 63 and enters the water storage space, which can prevent the accumulated water from entering the external pipe 518 or the internal pipe 517.

[0053] Based on Examples 1-2, the working principle of a hot air deicing device for wind turbine blades with a temperature protection function of the present invention is as follows:

[0054] During installation, install the inner panel 56 into the embedding hole 55, then insert the electric telescopic rod 58 into the mounting hole 57, then connect the adjusting inner core 59 to the electric telescopic rod 58, and finally put the outer sleeve 513 on the outside of the adjusting inner core 59, and fix the outer sleeve 513 and the inner panel 56 with bolts; lay the heating pipe 51, the return pipe 52 and the straight pipe 53 in the corresponding areas in the rotating blade 4, connect the jump bridge 54 to the heating interface 514, and connect the heating pipe 51 to the straight interface 515.

[0055] Place the filter membrane 64 into the inner liner 63 on one side, then piece the two inner liners 63 together, then pass the inner tube 517 through the limit platform 61, then put the outer shell 62 on the outside of the inner tube 517, embed the outer shell 62 into the groove, use the outer tube 518 to pass through the limit platform 61 and the outer shell 62 on the other side in the same way, then piece the two outer shells 62 together on the outside of the inner liner 63, thus completing the assembly of the filter assembly 6, and finally fix the filter assembly 6 into the blade tail 44.

[0056] When in use, the hot air unit sends the hot air into the external pipe 518, and then the external pipe 518 sends the hot air into the inner lining 63, and the hot air passes through the filter diaphragm 64 and enters the internal pipe 517. In this process, the particulate matter and water vapor in the hot air are intercepted, and the hot air enters the straight pipe 53 through the internal pipe 517. When the hot air flows to the jump bridge 54, it enters the outer sleeve 513 through the heating interface 514. At this time, the regulating inner core 59 is located above the outer sleeve 513, and the regulating inner core 59 is separated from the straight interface 515. One side of the heating interface 514 is connected to the upper end notch 510, and the other side of the heating interface 514 is blocked by the regulating inner core 59. In this way, the hot air flows from the upper notch 510 to the lower notch 511, and then flows into the heating pipe 51 through the straight interface 515. The hot air flows along the heating pipe 51 keeps flowing, and a large amount of heat is transferred to the leading edge 41 during the flow process. When it encounters the outer sleeve 513 again, if deicing is not required here, the sensor feedback signal is given to the electric telescopic rod 58, and the electric telescopic rod 58 pulls the adjusting inner core 59 to make the connecting hole 512 dock with the heating interface 514, and the adjusting inner core 59 blocks the opening on one side of the straight interface 515, so that the hot air enters the outer sleeve 513 through the straight interface 515, flows into the upper notch 510 from the straight interface 515, and then flows into the jump bridge 54 and the straight pipe 53 through the connecting hole 512 and the heating interface 514. The hot air flows along the straight pipe 53 all the time and flows quickly toward the direction of the blade tip 43 to reduce heat loss. In this way, the hot air takes different routes according to the actual situation, and finally enters the return pipe 52 and returns to the hot air unit.

[0057] Since the channel for hot air circulation is relatively closed, it is difficult for particulate matter to penetrate, but water vapor can penetrate more easily. After the equipment has been working for a period of time, a large amount of water vapor will gather on the surface of the filter membrane 64, and the water vapor will gather and condense and flow down, gathering in the lining 63. When the rotating blades 4 rotate around the blade platform 3, the accumulated water will flow into the outer casing 62 through the leakage holes 65.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hot air deicing device for wind turbine blades with a temperature protection function, comprising a frame (1), a nacelle (2) arranged on the top of the frame (1), a blade platform (3) arranged in front of the nacelle (2), and a rotating blade (4) arranged outside the blade platform (3), wherein the rotating blade (4) comprises four parts: a leading edge (41), a trailing edge (42), a blade tip (43), and a blade tail (44), and characterized in that: It also includes a heating component (5), which specifically includes a heating pipe (51) and a return pipe (52) arranged in the rotating blade (4); The heating pipe (51) is laid on the inner wall of the leading edge (41), and the return pipe (52) is laid on the inner wall of the trailing edge (42). The heating pipe (51) and the return pipe (52) are connected at the blade tip (43), and the heating pipe (51) and the return pipe (52) extend out from the blade tail (44).

2. The hot air deicing device for wind turbine blades with temperature protection function according to claim 1 is characterized in that: The heating pipe (51) is laid in a coiled manner and gradually becomes sparser from the blade tail (44) to the blade tip (43).

3. The hot air deicing device for wind turbine blades with temperature protection function according to claim 2 is characterized in that: The heating assembly (5) further comprises a straight-through pipe (53) arranged in the rotating blade (4); the straight-through pipe (53) is laid on the inner wall of the leading edge (41); and a jump bridge (54) is arranged at the intersection of the straight-through pipe (53) and the heating pipe (51).

4. The hot air deicing device for wind turbine blades with temperature protection function according to claim 3 is characterized in that: The heating assembly (5) further comprises an embedding hole (55) provided on the inner wall of the front edge (41), an inner plate (56) and an outer sleeve (513) arranged inside the embedding hole (55), a mounting hole (57) provided on the surface of the inner plate (56), an electric telescopic rod (58) provided inside the mounting hole (57), a heating interface (514) and a straight-through interface (515) provided on the outer side of the outer sleeve (513), an adjusting inner core (59) provided inside the outer sleeve (513), an upper notch (510), a lower notch (511) and a connecting hole (512) provided on the outer side of the adjusting inner core (59), and a plug hole (516) provided on one end of the adjusting inner core (59) close to the inner plate (56); A sensor is arranged in the inner panel (56); one end of the electric telescopic rod (58) away from the inner panel (56) is threadedly connected to the plug hole (516); the upper notch (510) is connected to the lower notch (511); the communicating hole (512) is connected to the upper notch (510); the heating pipe (51) is connected to the openings at both ends of the straight-through interface (515); the jumping bridge (54) is connected to the openings at both ends of the heating interface (514); and the heating interface (514) is connected to the communicating hole (512).

5. The hot air deicing device for wind turbine blades with temperature protection function according to claim 4 is characterized in that: The upper notch (510) is butted against an end of the heating pipe (51) close to the blade tail (44), and the lower notch (511) is butted against an end of the jump bridge (54) close to the blade tail (44).

6. The hot air deicing device for wind turbine blades with temperature protection function according to claim 5 is characterized in that: A filter assembly (6) is also provided inside the rotating blade (4). The filter assembly (6) is located inside the blade tail (44) and closes the opening of the blade tail (44).

7. The hot air deicing device for wind turbine blades with temperature protection function according to claim 6 is characterized in that: The filter assembly (6) specifically comprises two limiting platforms (61) arranged in the blade tail (44), an outer shell (62) arranged between the two limiting platforms (61), an inner liner (63) arranged inside the outer shell (62), a filter membrane (64) arranged inside the inner liner (63), a through hole (66) opened at the center of the limiting platform (61), and a side opening (67) opened on the outer side of the outer shell (62); the heating assembly (5) further comprises an inner pipe (517) and an outer pipe (518); A groove is provided on one side of the limiting platform (61) close to the outer shell (62), and through holes (66) penetrate into the inner lining (63) from both ends. The inner pipe (517) and the outer pipe (518) penetrate the through holes (66) and are distributed at both ends of the filter membrane (64).

8. The hot air deicing device for wind turbine blades with temperature protection function according to claim 7 is characterized in that: The filter assembly (6) further comprises a water leakage hole (65) arranged on the outside of the inner lining (63); The outer shell (62) and the inner liner (63) are both spherical, a water storage space is provided between the outer shell (62) and the inner liner (63), and the water leakage hole (65) communicates the water storage space with the internal space of the inner liner (63).

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