A wind wheel and a fan thereof

Abstract

The application discloses a wind wheel and a fan thereof, and belongs to the technical field of wind wheels. The wind wheel comprises wind wheel blades and a hub; the hub is a cylinder; a plurality of the wind wheel blades are evenly arranged on the side surface of the hub along the circumferential direction of the hub; the wind wheel blades all comprise blade tips and blade roots; the bottom surface of the blade root is mounted on the side surface of the hub; the top surface of the blade root and the bottom surface of the blade tip are connected; the blade root comprises a plurality of blade root blades; every two adjacent blade root blades are staggered to form a gap. The wind wheel is applied to the fan, and in the movement process of the wind wheel, the airflow separated on both sides of the wind wheel blades can be pulled back to the position of the wind wheel blades, so that vortex separation is not generated, vortex loss in the working process of the wind wheel is reduced, static pressure in the working process of the wind wheel is improved, and noise in the working process of the wind wheel is reduced.

Description

Technical Field

[0001] This invention belongs to the field of fans in fluid machinery, and specifically relates to a wind turbine and its fan. Background Technology

[0002] like Figure 13 As shown, when the existing wind turbine is running, the installation angle of the blades will cause vortex separation when the airflow reaches the suction surface at the blade root, forming a vortex separation zone 30, which will increase the noise during the operation of the wind turbine.

[0003] Patent application CN114909325A discloses a low-noise axial flow impeller blade and an axial flow fan. By designing the blade tip winglets, the development of tip vortices is controlled, suppressing vortex noise at the blade tip and casing, thereby reducing the aerodynamic noise of the fan. However, vortex separation still occurs when the airflow passes over the blade root, and the static pressure of this design is not high, so the noise reduction effect is not good enough. Summary of the Invention

[0004] The purpose of this invention is to provide a wind turbine and its fan that can effectively solve the problem of airflow separation at the blade position during wind turbine operation, thereby increasing the static pressure and reducing the noise during wind turbine operation.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0006] A wind turbine includes wind turbine blades and a hub; a plurality of wind turbine blades are evenly arranged on the side of the hub along the circumferential direction; each wind turbine blade includes a blade tip and a blade root; the bottom surface of the blade root is mounted on the side of the hub; the top surface of the blade root and the bottom surface of the blade tip are connected; the blade root includes a plurality of blade roots; every two adjacent blade roots are staggered to form a gap.

[0007] By setting multiple blades at the blade root, and staggering each pair of adjacent blades to form a gap, a negative pressure zone is formed at the gap when the airflow passes through. This can pull the airflow separated on both sides of the wind turbine blade back to the position of the wind turbine blade, thus preventing vortex separation. This reduces vortex losses during wind turbine operation, increases static pressure during wind turbine operation, and reduces noise during wind turbine operation.

[0008] Preferably, the leaf root includes a first leaf root blade and a second leaf root blade; the first leaf root blade and the second leaf root blade are staggered to form a gap.

[0009] By setting the blade root to two blades, the first blade root blade and the second blade root blade, so that there is only one gap, it is beneficial to better control the high-speed airflow.

[0010] Preferably, the first blade root includes a first top surface, a first bottom surface, a first leading edge, a first trailing edge, a first front surface, and a first back surface; the first top surface is connected to the bottom surface of the blade tip; the first bottom surface is mounted on the side of the hub; the first leading edge is away from the second blade root; the first trailing edge is close to the second blade root; the second blade root includes a second top surface, a second bottom surface, a second leading edge, a second trailing edge, a second front surface, and a second back surface; the second top surface is connected to the bottom surface of the blade tip; the second bottom surface is mounted on the side of the hub; the second leading edge is close to the first trailing edge; the second trailing edge is away from the first blade root; and the second leading edge and the first trailing edge are staggered to form the gap.

[0011] Preferably, the leaf root includes a top mounting surface and a bottom mounting surface; the intersection line of the first leading edge and the first top surface and the intersection line of the second trailing edge and the second top surface are located on the top mounting surface; the intersection line of the first leading edge and the first bottom surface and the intersection line of the second trailing edge and the second bottom surface are located on the bottom mounting surface.

[0012] Preferably, the angle between the top mounting surface and the cross-section of the hub is α1; the angle between the bottom mounting surface and the cross-section of the hub is α2; the angle between the second bottom surface and the cross-section of the hub is α3; the angle between the first bottom surface and the cross-section of the hub is α4; and α1 < α2; α4 < α2 < α3.

[0013] This configuration, with the blade root's base installation angle at α2 and its top installation angle at α1, ensures a uniform pressure distribution on the blade root pressure surface during wind turbine operation, since α1 < α2. This improves wind turbine efficiency and reduces noise. Furthermore, the first blade root's base installation angle is α4, and the second blade root's base installation angle is α3, where α4 < α2 < α3. This facilitates airflow on the suction surface without increasing flow resistance, effectively enhancing the work done by the blades and ultimately increasing static pressure during wind turbine operation.

[0014] Preferably, the width of each of the gaps is T1, and 1mm≤T1≤10mm.

[0015] This setting allows for the limitation of the gap width; it prevents the installation difficulty of the wind turbine blades from being increased due to an excessively small gap, and also prevents the wind turbine from being unable to generate high-speed airflow when it is working due to an excessively large gap, which would affect the generation of a negative pressure zone at the gap, causing the phenomenon of airflow separation and vortex generation to occur as usual, thus increasing the noise during the wind turbine's operation.

[0016] Preferably, the front and back sides of the wind turbine blades are respectively configured as a pressure surface and a suction surface; the first front side and the second front side are located on the pressure surface; the first back side and the second back side are located on the suction surface; the wind turbine blades rotate along the circumference of the hub, and the direction of rotation is the same as the orientation of the pressure surface.

[0017] Preferably, the impeller blade is an arc-shaped blade that is concave in its rotation direction, and the arc of the intersection line of the second bottom surface and the second back surface is the same as the arc of the impeller blade; the distance from the maximum width position of the second bottom surface to the second leading edge is T2; from the direction of the pressure surface to the suction surface, the first trailing edge and the second leading edge overlap by a length of T3; and 0≤T3≤0.2T2.

[0018] This design limits the overlap length of the first and second root blades, preventing insufficient overlap from affecting airflow acceleration during wind turbine operation and thus preventing the generation of high-speed airflow for noise reduction. It also prevents excessive overlap from causing the negative pressure zone formed by the gap to deviate from its position, thus failing to pull the separated airflow on both sides of the wind turbine blades back to the position of the wind turbine blades and preventing airflow separation.

[0019] Preferably, the distance from the tip of the blade to the hub is L1; the distance from the tip of the blade root to the hub is L2; ​​and 0 < L2 ≤ 0.5L1.

[0020] This design reduces the amount of airflow diverted to the blade tip suction surface through the gaps during wind turbine operation, thereby increasing the static pressure during wind turbine operation.

[0021] The present invention also provides a fan, including the aforementioned wind turbine.

[0022] Preferably, the fan further includes an air guide ring; the air guide ring is sleeved on the outside of the wind turbine.

[0023] Beneficial effects:

[0024] The present invention discloses a wind turbine and its fan, which, by setting the blade root to include two blades including a first blade root blade and a second blade root blade, and the first blade root blade and the second blade root blade are staggered to form a gap, when the airflow flows through, a negative pressure zone is formed at the gap, which can pull the airflow separated on both sides of the wind turbine blade back to the position of the wind turbine blade, thereby preventing eddy separation, reducing eddy loss during the operation of the wind turbine, increasing the static pressure of the wind turbine during operation, reducing the noise of the wind turbine during operation, and realizing a fan. Attached Figure Description

[0025] Figure 1 The diagram shown is a structural diagram of a fan according to Embodiment 2;

[0026] Figure 2 The diagram shown is a structural diagram of a wind turbine according to Embodiment 1;

[0027] Figure 3 As shown Figure 2 A structural diagram of the pressure surface of a wind turbine blade;

[0028] Figure 4 As shown Figure 3 Exploded view;

[0029] Figure 5 As shown Figure 3 Rear view;

[0030] Figure 6 As shown Figure 3 Schematic diagram of the first installation angle;

[0031] Figure 7 As shown Figure 3 Schematic diagram of the second installation angle;

[0032] Figure 8 As shown Figure 6 and Figure 7 External schematic diagram of the mounting angle;

[0033] Figure 9 As shown Figure 7 First external schematic diagram of the mounting angle;

[0034] Figure 10 As shown Figure 7 A second external schematic diagram of the mounting angle;

[0035] Figure 11 The diagram shows a high-speed airflow in implementation one;

[0036] Figure 12 The diagram shown is a schematic representation of the gap width in Example 1.

[0037] Figure 13 The diagram shown is a schematic representation of high-speed airflow in the prior art.

[0038] Figure Labels

[0039] 1. Wind turbine blade; 2. Hub; 3. Guide ring; 11. First root blade; 111. First top surface; 112. First bottom surface; 113. First leading edge; 114. First trailing edge; 12. Second root blade; 121. Second top surface; 122. Second bottom surface; 123. Second leading edge; 124. Second trailing edge; 13. Blade tip; 20. Slit; 30. Vortex separation zone; 40. High-speed airflow; 50. Suction surface; 60. Pressure surface; L1, length of the wind turbine blade; L2, length of the blade root; α1, angle between the top surface of the blade root and the hub cross-section; α2, angle between the bottom surface of the blade root and the hub cross-section; α3, angle between the second bottom surface and the hub cross-section; α4, angle between the first bottom surface and the hub cross-section; T1, width of the gap between the first trailing edge and the second leading edge; T2, distance from the highest arc position of the second bottom surface to the second leading edge; T3, length of the overlapping portion of the first trailing edge and the second leading edge. Detailed Implementation

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0041] The technical solution of the present invention will be described in detail below with specific embodiments.

[0042] Example 1

[0043] like Figures 2-12 As shown, a wind turbine of this embodiment includes wind turbine blades 1 and a hub 2; the hub 2 is a cylinder; multiple wind turbine blades 1 are evenly arranged on the side of the hub 2 along the circumference of the hub 2; each wind turbine blade 1 includes a blade tip 13 and a blade root; the bottom surface of the blade root is mounted on the side of the hub 2; the top surface of the blade root and the bottom surface of the blade tip 13 are connected; the blade root includes a first blade root blade 11 and a second blade root blade 12; the first blade root blade 11 and the second blade root blade 12 are staggered to form a gap 20.

[0044] In this embodiment, a wind turbine is configured with two blades at the blade root, including a first blade 11 and a second blade 12. The first blade 11 and the second blade 12 are staggered to form a gap 20. When the airflow passes through, a negative pressure zone is formed at the gap 20, which can pull the airflow separated on both sides of the wind turbine blade 1 back to the position of the wind turbine blade 1, thereby preventing vortex separation. This reduces vortex loss during wind turbine operation, increases static pressure during wind turbine operation, and reduces noise during wind turbine operation.

[0045] Preferably, the first root blade 11 includes a first top surface 111, a first bottom surface 112, a first leading edge 113, a first trailing edge 114, a first front surface, and a first back surface; the first top surface 111 is connected to the bottom surface of the blade tip 13; the first bottom surface 112 is mounted on the side of the hub 2; the first leading edge 113 is away from the second root blade 12; the first trailing edge 114 is close to the second root blade 12; the second root blade 12 includes a second top surface 121, a second bottom surface 122, a second leading edge 123, a second trailing edge 124, a second front surface, and a second back surface; the second top surface 121 is connected to the bottom surface of the blade tip 13; the second bottom surface 122 is mounted on the side of the hub 2; the second leading edge 123 is close to the first trailing edge 114; the second trailing edge 124 is away from the first root blade 11; and the second leading edge 123 and the first trailing edge 114 are staggered to form a gap 20.

[0046] Preferably, the blade root includes a top mounting surface and a bottom mounting surface; the intersection line of the first leading edge 113 and the first top surface 111 and the intersection line of the second trailing edge 124 and the second top surface 121 are located on the top mounting surface; the intersection line of the first leading edge 113 and the first bottom surface 112 and the intersection line of the second trailing edge 124 and the second bottom surface 122 are located on the bottom mounting surface.

[0047] Preferably, the angle between the top mounting surface and the cross section of the hub 2 is α1; the angle between the bottom mounting surface and the cross section of the hub 2 is α2; the angle between the second bottom surface 122 and the cross section of the hub 2 is α3; the angle between the first bottom surface 112 and the cross section of the hub 2 is α4; and α1 < α2; α4 < α2 < α3.

[0048] Specifically, such as Figure 4 As shown, on the pressure surface 60 of the wind turbine impeller 1, let the angles between the second front surface of the second blade root 12 and the second top surface 121, second bottom surface 122, second leading edge 123, and second trailing edge 124 of the surrounding sidewalls be A, B, C, and D; let the angles between the first front surface of the first blade root 11 and the first top surface 111, first bottom surface 112, first leading edge 113, and first trailing edge 114 of the surrounding sidewalls be E, F, G, and H; then the plane AF containing angles A and F is the top surface mounting surface AF of the blade root; the plane CH containing angles C and H is the bottom surface mounting surface CH of the blade root.

[0049] Specifically, such as Figures 6-8 As shown, the angle between the top mounting surface AF of the blade root and the cross section O of the hub 2 is α1, that is, the top mounting angle of the blade root is α1; the angle between the bottom mounting surface CH of the blade root and the cross section O of the hub 2 is α2, that is, the bottom mounting angle of the blade root is α2. Since α1 < α2, the pressure on the blade root pressure surface can be evenly distributed during the operation of the wind turbine, thereby improving the working efficiency of the wind turbine and reducing the noise generated during the operation of the wind turbine.

[0050] Furthermore, the plane CD containing angles C and D is the plane containing the second bottom surface 122, i.e., the bottom mounting surface CD of the second blade root 12; the plane GH containing angles G and H is the plane containing the first bottom surface 112, i.e., the bottom mounting surface GH of the first blade root 11; as shown Figures 7-10 As shown, the angle between the bottom mounting surface CD of the second root blade 12 and the cross section O of the hub 2 is α3, that is, the bottom mounting angle of the second root blade 12 is α3; the angle between the bottom mounting surface GH of the first root blade 11 and the cross section O of the hub 2 is α4, that is, the bottom mounting angle of the first root blade 11 is α4; since α4 < α2 < α3, it is beneficial for the airflow to flow on the suction surface 50 during the operation of the wind turbine without increasing the flow resistance, and it can effectively improve the work done by the wind turbine blade 1, and ultimately increase the static pressure during the operation of the wind turbine.

[0051] Preferably, the width of the gap 20 is T1, and 1mm≤T1≤5mm.

[0052] Specifically, this setting can limit the width of the gap 20; it prevents the installation difficulty of the wind turbine blades 1 from being increased due to the gap 20 being too small, and it also prevents the wind turbine from being unable to generate high-speed airflow 40 when it is working due to the gap 20 being too large, which would affect the generation of the airflow negative pressure zone at the gap 20, causing the phenomenon of airflow separation and vortex separation zone 30 to occur as usual, and increase the noise during the wind turbine's operation.

[0053] Preferably, the front and back sides of the wind turbine blade 1 are respectively set as a pressure surface 60 and a suction surface 50; the first front side and the second front side are located on the pressure surface 60; the first back side and the second back side are located on the suction surface 50; the wind turbine blade 1 rotates along the circumference of the hub 2, and the rotation direction is the same as the orientation of the pressure surface 60.

[0054] Preferably, the impeller blade 1 is an arc-shaped blade that is concave in its rotation direction, and the arc of the intersection line of the second bottom surface 122 and the second back surface is the same as the arc of the impeller blade 1; the distance from the maximum width position of the second bottom surface 122 to the second leading edge 123 is T2; from the direction of the pressure surface 60 to the suction surface 50, the first trailing edge 114 and the second leading edge 123 overlap by a length of T3; and 0≤T3≤0.2T2.

[0055] Specifically, this setting limits the overlap length T3 of the first root blade 11 and the second root blade 12. It prevents the overlap length T3 from being too small, which would affect the airflow acceleration during the wind turbine's operation and result in no high-speed airflow 40 being generated for noise reduction. It also prevents the overlap length of the first root blade 11 and the second root blade 12 from being too long, which would cause the negative pressure zone of the airflow formed by the gap 20 to deviate from its position and fail to pull the airflow separated on both sides of the wind turbine blade 1 back to the position of the wind turbine blade 1, thus preventing airflow separation.

[0056] Preferably, the distance from the tip of the blade 13 to the hub 2 is L1; the distance from the tip of the blade root to the hub 2 is L2; ​​and 0 < L2 ≤ 0.5L1.

[0057] Specifically, this setting can reduce the amount of airflow diverted through the gap 20 to the suction surface 50 of the blade tip 13 during wind turbine operation, thereby increasing the static pressure during wind turbine operation.

[0058] Specifically, such as Figure 11 As shown, during the operation of the wind turbine in this embodiment, airflow flows in from the first leading edge 113 of the first blade root 11 and is split by the wind turbine blade 1 into high-speed airflow 40 flowing towards the suction surface 50 and the pressure surface 60 respectively. When the high-speed airflow 40 flowing towards the pressure surface 60 passes through the gap 20, a portion of the airflow will be separated and flow towards the suction surface 50 due to the negative pressure zone formed by the gap 20, and then flow along the second back surface of the second blade root 12. At the same time, when the airflow flowing towards the suction surface 50 also passes through the gap 20, it will also be pulled back to the position of the wind turbine blade 1 due to the effect of the gap 20, and continue to flow along the second back surface of the second blade root 12, without the formation of vortex separation zone 30 due to airflow separation. This reduces vortex losses during the operation of the wind turbine, thereby increasing the static pressure and reducing the noise during the operation of the wind turbine.

[0059] Example 2

[0060] like Figure 1 As shown, a wind turbine in this embodiment includes the impeller of Embodiment 1.

[0061] Preferably, the fan also includes a guide ring 3; the guide ring 3 is fitted around the outside of the impeller.

[0062] Specifically, in this embodiment, the wind guide ring 3 can support the operation of the wind turbine and rectify the airflow generated during the operation of the wind turbine.

[0063] The embodiments of a wind turbine and its fan provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A wind turbine, characterized in that, The device includes wind turbine blades (1) and a hub (2); multiple wind turbine blades (1) are evenly arranged on the side of the hub (2) along the circumferential direction; each wind turbine blade (1) includes a blade tip (13) and a blade root; the bottom surface of the blade root is mounted on the side of the hub (2); the top surface of the blade root is connected to the bottom surface of the blade tip (13); the blade root includes multiple blade roots; each pair of adjacent blade roots is staggered to form a gap (20); the blade root includes a first blade root (11) and a second blade root (12); the first blade root (11) and the second blade root (12) The blades (12) are staggered to form a gap (20); the first root blade (11) includes a first top surface (111), a first bottom surface (112), a first leading edge (113), a first trailing edge (114), a first front surface, and a first back surface; the first top surface (111) is connected to the bottom surface of the blade tip (13); the first bottom surface (112) is mounted on the side of the hub (2); the first leading edge (113) is away from the second root blade (12); the first trailing edge (114) is close to the second root blade (12); the second root blade (12) includes a second top surface (121). The second bottom surface (122), the second leading edge (123), the second trailing edge (124), the second front surface, and the second back surface; the second top surface (121) and the bottom surface of the blade tip (13) are connected; the second bottom surface (122) is mounted on the side of the hub (2); the second leading edge (123) is close to the first trailing edge (114); the second trailing edge (124) is away from the first blade root (11); and the second leading edge (123) and the first trailing edge (114) are staggered to form the gap (20); the blade root includes a top mounting surface and a bottom mounting surface; the first leading edge (122) is close to the first trailing edge (114); the second leading edge (123) is close to the first trailing edge (114); the second trailing edge (124) is close to the first blade root (11); and the second leading edge (123) and the first trailing edge (114) are staggered to form the gap (20); the blade root includes a top mounting surface and a bottom mounting surface; the first leading edge (123) is close to the first trailing edge (124); the second ... 13) The line of intersection of the first top surface (111) and the line of intersection of the second trailing edge (124) and the second top surface (121) are located on the top surface mounting surface; the line of intersection of the first leading edge (113) and the first bottom surface (112) and the line of intersection of the second trailing edge (124) and the second bottom surface (122) are located on the bottom surface mounting surface; the top surface mounting angle of the leaf root is α1, the bottom surface mounting angle of the leaf root is α2, the bottom surface mounting angle of the second leaf root blade (12) is α3, and the bottom surface mounting angle of the first leaf root blade (11) is α4; and α1 < α2; α4 < α2 < α3.

2. The wind turbine according to claim 1, characterized in that, The width of each of the gaps (20) is T1, and 1mm≤T1≤10mm.

3. The wind turbine according to claim 1, characterized in that, The front and back sides of the wind turbine blade (1) are respectively set as a pressure surface (60) and a suction surface (50); the first front side and the second front side are located on the pressure surface (60); the first back side and the second back side are located on the suction surface (50); the wind turbine blade (1) rotates along the circumference of the hub (2), and the rotation direction is the same as the orientation of the pressure surface (60).

4. The wind turbine according to claim 3, characterized in that, The wind turbine blade (1) is an arc-shaped blade that is concave in its rotation direction, and the arc of the intersection line of the second bottom surface (122) and the second back surface is the same as the arc of the wind turbine blade (1); the distance from the maximum width position of the second bottom surface (122) to the second leading edge (123) is T2; from the direction of the pressure surface (60) towards the suction surface (50), the first trailing edge (114) and the second leading edge (123) overlap by a length of T3; and 0≤T3≤0.2T2.

5. The wind turbine according to claim 1, characterized in that, The distance from the tip of the blade (13) to the hub (2) is L1; the distance from the tip of the blade root to the hub (2) is L2; ​​and 0 < L2 ≤ 0.5L1.

6. A fan, characterized in that, The wind turbine includes the wind turbine as described in any one of claims 1 to 5; the wind turbine also includes a wind guide ring (3); the wind guide ring (3) is sleeved on the outside of the wind turbine.

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