Wind engine blade capable of avoiding icing

Abstract

The invention relates to the technical field of wind power new energy equipment, in particular to a wind power engine blade capable of avoiding icing, which comprises a blade main body and a heating cable, and the heating cable is arranged in a shell of the blade main body; the wind turbine blade further comprises a baffle, a jacking mechanism and a mounting groove, the mounting groove is formed in a shell of the blade body, the jacking mechanism comprises a motor, a driving wheel, a transmission belt, driven wheels, a jacking rod, mounting bases and a rotating shaft, the two driven wheels, one jacking rod, one rotating shaft and the two mounting bases form a jacking unit, and a plurality of jacking units are arranged in series. A plurality of mounting holes with openings in one ends are formed in the mounting groove, the baffle is mounted at the openings of the mounting holes, and the jacking unit is mounted in the mounting groove below the baffle. According to the wind turbine blade, the ice is cut by heating and melting, the ice is removed through the jacking mechanism, only a small amount of ice blocks need to be melted, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wind engines, and in particular to a wind engine blade capable of avoiding icing. Background Art

[0002] Wind turbines, also known as fans or wind turbines for short, are devices that convert the kinetic energy of airflow into mechanical energy, and they capture wind energy through blades. Wind turbines can be connected to and driven by generators to generate electricity; connected to and driven by water pumps to pump water for irrigation; connected to and driven by heat pump systems to heat or cool. Blade icing is prone to occur in areas with high humidity in winter. Icing will increase the weight of the blades, change their shape, and form an unbalanced load, which will affect the service life of the wind turbine. Ice thrown when the blades rotate will also threaten personal and property safety. Existing solutions to the icing problem include: 1. Applying anti-icing paint; 2. Thermal deicing, which melts the ice layer on the surface of the blades by heating. There are two heating methods: electric heating and gas heating. Electric heating is to install conductive materials on the blades to convert electrical energy into thermal energy, and heat the blades to achieve deicing; gas heating is to install heating and blowing devices in the blades to use the flow of hot air in the cavity of the fan blades to transfer heat and melt the ice layer. Applying anti-icing paint can slow down freezing, but when encountering extremely cold weather, the anti-freeze paint will become ineffective; thermal deicing requires melting a large amount of ice and consumes more electricity.

[0003] To this end, the invention patent with authorization announcement number CN116498507B provides an electric heating control method and electric heating system for wind turbine blades. The electric heating system includes a power supply device, an electric heating assembly formed by multiple electric heating units located on the surface of the blade body and arranged longitudinally along the wind turbine blade, and an electrical connection device connecting the power supply device and each electric heating unit. Each electric heating unit is connected to the power supply device in parallel to form a plurality of parallel circuits; the power supply device includes a power supply and a control device, and the control device connects the power supply and the electrical connection device to control each parallel circuit separately; the electric heating control method includes: using the control device to adjust the voltage on each electric heating unit separately, so that each electric heating unit generates the required heat, effectively realizing the anti-icing of the wind turbine blade, and at the same time significantly reducing the self-consumption of the system.

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: 1. The patented technology adopts a method of individually controlling each electric heating unit to heat the ice, but it still needs to melt a large amount of ice cubes, which consumes a lot of electricity; 2. Regardless of whether the blades are heated simultaneously or locally, the existing thermal deicing method needs to melt a large amount of ice cubes, which consumes a lot of electricity. Summary of the invention

[0005] The present invention aims at the deficiencies of the prior art and develops a wind turbine blade capable of avoiding icing, which reduces the energy consumption of removing ice.

[0006] The technical solution to the technical problem solved by the present invention is as follows: an embodiment of the present invention provides a wind turbine blade that can avoid icing, comprising a blade body and a heating cable, wherein the heating cable is arranged in a shell of the blade body; the wind turbine blade also comprises a baffle, a lifting mechanism, and a mounting groove, wherein the mounting groove is arranged in the shell of the blade body, and the lifting mechanism is arranged in the mounting groove, wherein the lifting mechanism comprises a motor, a driving wheel, a transmission belt, a driven wheel, a lifting rod, a mounting seat, and a rotating shaft, wherein the driving wheel is installed on the output shaft of the motor, two driven wheels and a lifting rod are fixed on the rotating shaft, and both ends of the rotating shaft are installed on the mounting seat through bearings Two driven wheels, a push rod, a rotating shaft, and two mounting seats constitute a group of lifting units. Multiple groups of lifting units are arranged in series. The driven wheel of the first group of lifting units is connected to the driving wheel through a transmission belt, and the driven wheel of the next group of lifting units is connected to the driven wheel of the previous group of lifting units through a transmission belt; a plurality of mounting holes with one end open are arranged in the mounting groove, and the openings of the mounting holes are located on the outside of the blade shell. The baffle is installed at the opening of the mounting hole, and the lifting unit is installed in the mounting groove below the baffle. A shaft connecting hole is arranged at one end of the push rod, and the distance between the other end of the push rod and the center of the shaft connecting hole is greater than the distance between the bottom surface of the baffle and the center of the rotating shaft.

[0007] As an optimization, the baffle is an elastic rubber plate or a soft plastic plate.

[0008] As an optimization, the driving wheel and the driven wheel are pulleys, and the transmission belt is a belt; or the driving wheel and the driven wheel are sprockets, and the transmission belt is a chain; or the driving wheel and the driven wheel are synchronous pulleys, and the transmission belt is a synchronous belt.

[0009] As an optimization, the motor is fixed on a mounting plate, and the mounting plate and the mounting seat are fixed on the bottom surface of the mounting groove.

[0010] As an optimization, the driving wheel is fixed to the output shaft of the motor through a key, and the driven wheel and the push rod are fixed to the rotating shaft through a key.

[0011] As an optimization, the heating cable is arranged on a side close to the outer surface of the blade body.

[0012] As an optimization, the heating cable is arranged along the length direction of the blade body, and the heating cable passes through both ends of the blade body in the length direction; the lifting mechanism is arranged along the length direction of the blade body, and the lifting mechanism passes through both ends of the blade body in the length direction.

[0013] As an optimization, the heating cable and the lifting mechanism are spaced apart from each other.

[0014] As an optimization, the maximum distance between the heating cable and the lifting mechanism is 0.3~0.5m.

[0015] As an optimization, a heating cable is arranged at the center of the front end face and / or the rear end face in the rotation direction of the blade body.

[0016] The effects provided in the content of the invention are only the effects of the embodiments, rather than all the effects of the invention. The above technical solution has the following advantages or beneficial effects:

[0017] 1. By setting the heating cable in the shell of the blade body, the trouble of disassembling and assembling the heating material is omitted compared to installing the heating material on the blade surface; the push rod is installed on the rotating shaft through the shaft connection hole and the key, and the distance between the other end of the push rod and the center of the shaft connection hole is set to be greater than the distance between the bottom surface of the baffle and the center of the rotating shaft. By rotating the push rod, the baffle can be lifted up, so that a bulge appears on the surface of the blade body, thereby pushing the ice down; by arranging the heating cable and the lifting mechanism at intervals, when the ice is thin, only the lifting mechanism is started to push the ice away from the blade; when the ice is thick, the heating cable is first started to divide the ice, melt the ice into multiple parallel pieces, and then the lifting mechanism is started to push the ice away from the blade. The wind turbine blade only needs to heat and melt the divided ice, and only a small amount of ice is melted to remove the ice, thereby reducing the energy consumption of removing the ice.

[0018] 2. The baffle is elastic. By setting the baffle to be an elastic rubber plate or a soft plastic plate, the baffle can be installed at the opening of the mounting hole in the mounting groove by gluing, which can not only seal the mounting groove to prevent water from intruding and affecting the normal operation of the equipment, but also deform when in contact with the top rod to form a bulge on the blade surface, thereby removing ice. By setting the heating cable on the side close to the outer surface of the blade body, heat can be quickly transferred to the ice, reducing heat loss.

[0019] 3. The length of wind turbine blades can reach tens or hundreds of meters, and the surface of the blades is a large-diameter curved surface, so it is difficult for small pieces of ice to adhere to the surface of the blades. During thermal deicing, the size of the ice falling from the blades is usually more than one meter, so the maximum distance between the heating cable and the lifting mechanism is set to 0.3~0.5m, and the maximum distance between the two heating cables is 0.6~1m. The maximum width of the ice formed after the heating cable cuts the ice will not exceed 1m, and it cannot adhere to the surface of the blade and is easily pushed down.

[0020] 4. When the wind turbine blades rotate, the front and rear faces of the blades in the direction of rotation rotate in a circle in the vertical plane. The points of force for ice accumulation are mainly concentrated on the front and rear faces of the blades in the direction of rotation. By arranging heating cables at the center of the front and / or rear faces of the blade body in the direction of rotation, the ice accumulation can be separated from the gravity direction through the heating cables, eliminating the main force area for ice accumulation, which is more conducive to the removal and automatic shedding of ice. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of an embodiment of the present invention.

[0022] Figure 2 for Figure 1 Magnified view of the fracture.

[0023] Figure 3 It is an enlarged left view of an embodiment of the present invention.

[0024] Figure 4 for Figure 2 Enlarged cross-sectional view along CC direction.

[0025] Figure 5 for Figure 3 A partial enlarged view of the D area in the middle.

[0026] Figure 6 for Figure 3 A partial enlarged view of the E area.

[0027] Figure 7 for Figure 4 A partial enlarged view of the F area.

[0028] Figure 8 It is a stereoscopic view from the upper left rear end perspective of the jacking mechanism in one embodiment of the present invention.

[0029] Fig. 9 for Figure 8 A partial enlarged view of the middle H area.

[0030] Fig.10 It is a stereoscopic view from the upper left front end perspective of a lifting mechanism in one embodiment of the present invention.

[0031] Fig.11 for Fig.10 A partial enlarged view of the middle J region.

[0032] Fig.12 for Figure 2 A partial enlarged view of the middle G area.

[0033] Fig.13 for Figure 2 A magnified partial cross-sectional view of the middle G area.

[0034] Fig.14 for Fig.12 Enlarged cross-sectional view along the AA direction.

[0035] Fig.15 This is the structural principle diagram of the baffle area.

[0036] Fig.16 This is the working status diagram of the baffle area.

[0037] Among them: 1. heating cable, 2. baffle, 3. lifting mechanism, 4. mounting groove, 31. motor, 32. driving wheel, 33. transmission belt, 34. driven wheel, 35. ejector rod, 36. mounting seat, 37. rotating shaft. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0039] Figures 1 to 16 As an embodiment of the present invention, Figure 5 As shown, a wind turbine blade that can avoid icing includes a blade body and a heating cable 1, wherein the heating cable 1 is arranged in a shell of the blade body and arranged on a side close to the outer surface of the blade body. Figure 2 , Figure 6 , Figure 7 As shown, the wind turbine blade also includes a baffle 2, a lifting mechanism 3, and a mounting groove 4, wherein the mounting groove 4 is arranged in the shell of the blade body, and the lifting mechanism 3 is arranged in the mounting groove 4. The blade body is mainly made of composite materials, among which glass fiber is one of the key raw materials. In addition, carbon fiber also plays an important role because it has the characteristics of high strength, good rigidity and light weight, and is particularly suitable for high-speed, high-temperature and high-pressure environments. Wind turbine blades usually consist of three parts: a root, a shell and a reinforcing rib, and most of these parts are made of composite materials, and their weight usually accounts for more than 90% of the entire blade. Glass fiber has a low thermal conductivity and a weak thermal conductivity. By arranging the heating cable 1 on one side close to the outer surface of the blade body, heat can be quickly transferred to the ice cubes to reduce heat loss.

[0040] like Figure 2 As shown, the heating cable 1 is arranged along the length direction of the blade body, and the heating cable 1 runs through both ends of the blade body in the length direction; the lifting mechanism 3 is arranged along the length direction of the blade body, and the lifting mechanism 3 runs through both ends of the blade body in the length direction. The heating cable 1 and the lifting mechanism 3 are spaced apart. The maximum spacing between the heating cable 1 and the lifting mechanism 3 is 0.3~0.5m. The length of the wind turbine blade can reach tens or hundreds of meters, and the blade surface is a large-diameter arc surface, and small pieces of ice are difficult to adhere to the blade surface. During thermal deicing, the size of the ice cubes falling from the blade is usually more than one meter, so the maximum spacing between the heating cable 1 and the lifting mechanism 3 is set to 0.3~0.5m, and the maximum spacing between the two heating cables 1 is 0.6~1m. The maximum width of the ice cubes formed after the heating cable 1 cuts the ice will not exceed 1m, and cannot adhere to the blade surface, and is easily pushed down.

[0041] like Figure 3As shown, the top of the figure is the front end face of the blade body in the rotation direction, and a heating cable 1 is arranged at the center of the front end face in the rotation direction of the blade body. When the blade body rotates, the front end face and the rear end face in the rotation direction of the blade make a circular rotation in the vertical plane, and the force points of ice coating are mainly concentrated on the front end face and the rear end face in the rotation direction of the blade. By arranging the heating cable 1 at the center of the front end face and / or the rear end face in the rotation direction of the wind turbine blade, the ice coating can be separated from the gravity direction by the heating cable 1, eliminating the main force area of ​​ice coating, which is more conducive to the removal and automatic shedding of ice.

[0042] like Figures 8 to 11 As shown, the jacking mechanism 3 includes a motor 31, a driving wheel 32, a transmission belt 33, a driven wheel 34, a push rod 35, a mounting seat 36, and a rotating shaft 37. The driving wheel 32 is mounted on the output shaft of the motor 31. Two driven wheels 34 and a push rod 35 are fixed on the rotating shaft 37. Both ends of the rotating shaft 37 are mounted on the mounting seat 36 through bearings. Two driven wheels 34, a push rod 35, a rotating shaft 37, and two mounting seats 36 form a group of jacking units. Multiple groups of jacking units are arranged in series. The driven wheels 34 of the first group of jacking units are connected to the driving wheel 32 through the transmission belt 33, and the driven wheels 34 of the next group of jacking units are connected to the driven wheels 34 of the previous group of jacking units through the transmission belt 33. Figure 8 As shown, the driving wheel 32 is fixed on the output shaft of the motor 31 through a key, and the driven wheel 34 and the push rod 35 are fixed on the rotating shaft 37 through a key.

[0043] like Figures 13 to 16 As shown, the mounting groove 4 is provided with a plurality of mounting holes with one end open, such as Fig.14 As shown, the opening of the mounting hole is located outside the blade shell, the baffle 2 is installed at the opening of the mounting hole, and the jacking unit is installed in the mounting groove 4 below the baffle 2, as shown in FIG. Fig.11 As shown, one end of the push rod 35 is provided with an axis connection hole, such as Fig.16 As shown, the distance between the other end of the push rod 35 and the center of the shaft connection hole is greater than the distance between the bottom surface of the baffle 2 and the center of the rotating shaft 37. Fig.14As shown, the motor 31 is fixed on the mounting plate, and the mounting plate and the mounting seat 36 are fixed on the bottom surface of the mounting groove 4. The baffle 2 is an elastic rubber plate or a soft plastic plate. The baffle 2 is elastic. By setting the baffle 2 as an elastic rubber plate or a soft plastic plate, the baffle 2 can be installed at the opening of the mounting hole in the mounting groove 4 by pasting. The baffle 2 is a circular plate, and a groove for installing the baffle 2 is provided at the opening of the mounting hole. When not in contact with the top rod 35, the top surface of the baffle 2 is flush with the surface of the blade. The baffle 2 can not only seal the mounting groove 4 to prevent water from ingress and affecting the normal operation of the equipment, but also deform when in contact with the top rod 35 to form a bulge on the surface of the blade, thereby removing ice. The driving wheel 32 and the driven wheel 34 are pulleys, and the transmission belt 33 is a belt; or the driving wheel 32 and the driven wheel 34 are sprockets, and the transmission belt 33 is a chain; or the driving wheel 32 and the driven wheel 34 are synchronous pulleys, and the transmission belt 33 is a synchronous belt.

[0044] By arranging the heating cable 1 in the shell of the blade body, the trouble of disassembling and assembling the heating material is omitted compared to installing the heating material on the blade surface; the push rod 35 is installed on the rotating shaft 37 through the shaft connection hole and the key, and by setting the distance between the other end of the push rod 35 and the center of the shaft connection hole to be greater than the distance between the bottom surface of the baffle 2 and the center of the rotating shaft 37, the push rod 35 can be rotated to lift up the baffle 2, so that a bulge appears on the surface of the blade body, thereby pushing down the ice cube; by arranging the heating cable 1 and the lifting mechanism 3 at intervals, when the ice is thin, only the lifting mechanism 3 is started to push the ice cube away from the blade; when the ice is thick, the heating cable 1 is first started to divide the ice, melt the ice into multiple parallel pieces, and then the lifting mechanism 3 is started to push the ice cube away from the blade. The wind turbine blade only needs to heat and melt the divided ice, and only a small amount of ice cubes are melted to remove the ice, thereby reducing the energy consumption of removing the ice.

[0045] The production steps of wind turbine blades include:

[0046] 1. Design and manufacture blade molds: According to the needs of wind turbines, formulate blade design plans and manufacture blade molds that meet production needs for use in subsequent production molds.

[0047] 2. Manufacturing blade shell: Cut, splice, and solidify glass fiber and other materials according to the design plan to make blade shell. In the shell, embed heating cables 1 and connectors to connect the blade and the mechanical shaft. At the same time, the installation groove 4 is also processed in the shell.

[0048] 3. Coating with glass fiber material: A layer of glass fiber material (usually epoxy resin) is coated on the surface of the blade shell to increase the strength and durability of the blade.

[0049] 4. Perform welding: connect the connector on the surface of the blade to the mechanical shaft, connect the heating cable 1, and install the jacking mechanism 3 and the baffle 2. At the same time, a series of quality inspections and tests should be carried out to ensure that the quality of the blade meets the requirements.

[0050] 5. Final processing: The blades are processed and shaped to ensure the balance and streamline of the blades. Finally, the blades are surface treated (such as painting) to improve the appearance quality.

[0051] 6. Delivery completed: The blades that have gone through the above steps will be quality inspected, and the blades that meet the requirements will be packaged and shipped.

[0052] Although the above describes a specific implementation method in conjunction with the drawings, it is not intended to limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A wind turbine blade capable of avoiding icing, comprising a blade body and a heating cable (1), wherein: The heating cable (1) is arranged in a shell of a blade body; the wind turbine blade further comprises a baffle (2), a lifting mechanism (3), and a mounting groove (4); the mounting groove (4) is arranged in the shell of the blade body; the lifting mechanism (3) is arranged in the mounting groove (4); the lifting mechanism (3) comprises a motor (31), a driving wheel (32), a transmission belt (33), a driven wheel (34), a lifting rod (35), a mounting seat (36), and a rotating shaft (37); the driving wheel (32) is mounted on an output shaft of the motor (31); two driven wheels (34) and a lifting rod (35) are fixed on the rotating shaft (37); two ends of the rotating shaft (37) are mounted on the mounting seat (36) via bearings; the two driven wheels (34), a lifting rod (35), a A rotating shaft (37) and two mounting seats (36) form a group of jacking units, and a plurality of jacking units are arranged in series. The driven wheel (34) of the first group of jacking units is connected to the driving wheel (32) via a transmission belt (33), and the driven wheel (34) of the next group of jacking units is connected to the driven wheel (34) of the previous group of jacking units via a transmission belt (33). A plurality of mounting holes with one end open are arranged in the mounting groove (4), and the openings of the mounting holes are located outside the blade shell. The baffle (2) is mounted at the openings of the mounting holes. The jacking unit is mounted in the mounting groove (4) below the baffle (2). A shaft connecting hole is arranged at one end of the jacking rod (35), and the distance between the other end of the jacking rod (35) and the center of the shaft connecting hole is greater than the distance between the bottom surface of the baffle (2) and the center of the rotating shaft (37).

2. A wind turbine blade capable of avoiding icing according to claim 1, characterized in that: The baffle (2) is an elastic rubber plate or a soft plastic plate.

3. The wind turbine blade capable of avoiding icing according to claim 1, characterized in that: The driving wheel (32) and the driven wheel (34) are pulleys, and the transmission belt (33) is a belt; or the driving wheel (32) and the driven wheel (34) are sprockets, and the transmission belt (33) is a chain; or the driving wheel (32) and the driven wheel (34) are synchronous pulleys, and the transmission belt (33) is a synchronous belt.

4. The wind turbine blade capable of avoiding icing according to claim 1, characterized in that: The motor (31) is fixed on a mounting plate, and the mounting plate and the mounting seat (36) are fixed on the bottom surface of the mounting groove (4).

5. The wind turbine blade capable of avoiding icing according to claim 1, characterized in that: The driving wheel (32) is fixed to the output shaft of the motor (31) via a key, and the driven wheel (34) and the push rod (35) are fixed to the rotating shaft (37) via a key.

6. The wind turbine blade capable of avoiding icing according to claim 1, characterized in that: The heating cable (1) is arranged on a side close to the outer surface of the blade body.

7. The wind turbine blade capable of avoiding icing according to claim 1, characterized in that: The heating cable (1) is arranged along the length direction of the blade body, and the heating cable (1) passes through both ends of the blade body in the length direction; the lifting mechanism (3) is arranged along the length direction of the blade body, and the lifting mechanism (3) passes through both ends of the blade body in the length direction.

8. The wind turbine blade capable of avoiding icing according to claim 7, characterized in that: The heating cable (1) and the lifting mechanism (3) are spaced apart.

9. The wind turbine blade capable of avoiding icing according to claim 8, characterized in that: The maximum distance between the heating cable (1) and the lifting mechanism (3) is 0.3-0.5 m.

10. The wind turbine blade capable of avoiding icing according to claim 9, characterized in that: A heating cable (1) is arranged at the center of the front face and / or the rear face in the rotation direction of the wind turbine blade.

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