Lightweight backward-inclined wind wheel and fan

Abstract

The light-weight backward-inclined wind wheel comprises a wind wheel shell and a plurality of blades, and all the blades are evenly distributed around the wind wheel axis of the wind wheel shell along the circumferential track. Each blade comprises an arc-sheet-shaped wind collecting root part, a front wing part, a middle wing part and a rear wing part, the wind collecting root part is connected to the side, close to the axis of the wind wheel, of the front wing part, the middle wing part is connected to the side, away from the wind collecting root part, of the front wing part, and the rear wing part is connected to the side, away from the front wing part, of the middle wing part; the wind collecting circle center of the wind collecting root part is located on the side, away from the axis of the wind wheel, of the blade, the front wing circle center of the front wing part, the middle wing circle center of the middle wing part and the rear wing circle center of the rear wing part are all located on the side, close to the axis of the wind wheel, of the blade, the front wing curvature of the front wing part is larger than the middle wing curvature of the middle wing part, and the middle wing curvature is larger than the rear wing curvature of the rear wing part. According to the utility model, the flow resistance and energy loss can be effectively reduced, and the blades can meet the lightweight design, so that the load of the wind turbine is reduced, and the energy utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the field of wind turbine components, in particular to a lightweight backward-inclined wind wheel and a wind turbine. Background Art

[0002] The wind wheel, composed of blades and a hub, is one of the key components of a wind turbine. Its performance directly affects the wind energy utilization efficiency of the wind turbine and the loads borne by the unit. The wind wheel can achieve the conversion between wind energy and mechanical energy.

[0003] In related technologies, the designs of wind wheels are diverse, with different types set according to different application scenarios. However, there are generally some deficiencies. Traditional wind wheels often generate relatively large noises during operation, and their aerodynamic performance is not good. To meet the requirements of large air volume and high wind pressure, the blades often need to be set with a relatively large thickness to resist the wind resistance generated during operation, which will cause a relatively large burden on the wind turbine and result in large energy losses. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a lightweight backward-inclined wind wheel and a wind turbine, which have good aerodynamic performance, can meet the requirements of lightweight design, and have high energy utilization rate.

[0005] A lightweight backward-inclined wind wheel according to an embodiment of the first aspect of the utility model includes a wind wheel housing and a plurality of blades. Each blade is connected inside the wind wheel housing, and all the blades are evenly distributed along a circumferential trajectory around the wind wheel axis of the wind wheel housing. Each blade is parallel to the wind wheel axis; the blade includes a wind collection root, a front wing part, a middle wing part, and a rear wing part, all of which are in the shape of an arc sheet. The wind collection root is connected to one side of the front wing part close to the wind wheel axis, the middle wing part is connected to the side of the front wing part far from the wind collection root, the rear wing part is connected to the side of the middle wing part far from the front wing part. The wind collection center of the wind collection root is located on the side of the blade far from the wind wheel axis, and the front wing center of the front wing part, the middle wing center of the middle wing part, and the rear wing center of the rear wing part are all located on the side of the blade close to the wind wheel axis. The front wing curvature of the front wing part is greater than the middle wing curvature of the middle wing part, and the middle wing curvature is greater than the rear wing curvature of the rear wing part.

[0006] In this embodiment, the wind collection curvature of the wind collection root is greater than the front wing curvature.

[0007] In this embodiment, the wind collection root, the front wing part, the middle wing part, and the rear wing part are of an integrated structure, and the surface of the blade is smooth.

[0008] In this embodiment, the connection line between the inlet end of the blade and the outlet end of the adjacent blade is perpendicular to and intersects with the wind wheel axis.

[0009] In this embodiment, the curvature of the inner circular trajectory where one end of all air-collecting roots away from the front wing part is located is the inner-ring curvature, and the rear wing curvature is less than the inner-ring curvature.

[0010] In this embodiment, the wind wheel housing includes a rear cover and an annular front ring, and the rear cover and the front ring are respectively riveted and connected to opposite sides of the blade.

[0011] In this embodiment, a flange ring protruding away from the rear cover is provided on the inner-ring side of the front ring, and a fixing and positioning part is provided on one side of the air-collecting root close to the front ring, and the fixing and positioning part abuts against the flange ring.

[0012] In this embodiment, there are 7 blades provided.

[0013] A wind turbine according to an embodiment of the second aspect of the present invention includes the lightweight rear-tilt wind wheel of the above-mentioned first aspect embodiment, and the outlet angle of the blade is less than a right angle.

[0014] The embodiments of the present invention at least have the following beneficial effects:

[0015] By setting the blades parallel to the wind wheel axis and each part having an arc-shaped structure, a radial air outlet effect can be formed. By setting the front wing curvature, middle wing curvature, and rear wing curvature to decrease in sequence, the air flow on the blades can be made smoother, the air acceleration and diffusion effects are good, the flow resistance and energy loss can be effectively reduced, the blades can meet the lightweight design, thereby reducing the load of the wind turbine, having a high energy utilization rate, being able to guide the air flow more stably and smoothly, thereby improving the overall aerodynamic performance of the wind wheel. By reducing the impact and eddy current between the air and the blades, the generation and propagation of noise can also be reduced; in addition, the gradually decreasing curvature from the inside to the outside can also effectively reduce the wind resistance received by the outer peripheral area of the blade, effectively reducing the load of the rear wing part with a longer force arm. This rear-tilt wind wheel has small vibration and less wear during operation, can not only effectively improve the stability and reliability of the operation of the rear wing part, but also effectively extend the service life of the rear wing part, and has low maintenance costs; by setting the air-collecting center on the side of the blade away from the wind wheel axis and the centers of each wing part on the side of the blade close to the wind wheel axis, the air-collecting root can capture more air and diffuse it to the working areas of each wing part. While maintaining a large air volume, this rear-tilt wind wheel can effectively increase the wind pressure, thereby improving the overall efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0017] Figure 1 is a schematic perspective view of the lightweight rear-tilt wind wheel according to the embodiment of the present invention;

[0018] Figure 2Schematic diagram of the three-dimensional structure of the lightweight rear-tilting wind wheel according to an embodiment of the present invention from another perspective;

[0019] Figure 3 Schematic diagram of the side view structure of the lightweight rear-tilting wind wheel according to an embodiment of the present invention;

[0020] Figure 4 Along Figure 3 Schematic diagram of the sectional structure of A-A' in

[0021] Figure 5 Schematic diagram of the structure of the blade in the lightweight rear-tilting wind wheel according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] Wind wheel housing 100, rear cover 110, front ring 120, flange ring 121;

[0024] Blade 200, air collecting root 210, fixing and positioning part 211, front wing part 220, middle wing part 230, rear wing part 240. Detailed implementation manners

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, left, right, front, and rear is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0027] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0029] The wind wheel, composed of blades and a hub, is one of the key components of a wind turbine. The quality of its performance directly affects the wind energy utilization efficiency of the wind turbine and the loads on the unit. The wind wheel can achieve the conversion between wind energy and mechanical energy. In related technologies, the designs of wind wheels are diverse, with different types set according to different application scenarios, but there are generally some deficiencies. Traditional wind wheels often generate relatively large noises during operation, which not only affects the overall performance of the equipment but may also cause unnecessary interference to the surrounding environment. Moreover, the aerodynamic performance of traditional wind wheels is not good. To meet the requirements of large air volume and high wind pressure, the blades often need to be set with a relatively large thickness to resist the wind resistance generated during operation, which will impose a relatively large burden on the wind turbine, result in large energy losses and low efficiency. Especially in application scenarios with high static pressure and large air volume, these problems are particularly prominent.

[0030] Traditional wind wheel blade designs often adopt straight or simple arc structures, making it difficult to fully utilize the principles of aerodynamics to achieve efficient and low-noise air volume transmission. At the same time, the air collection, flow guiding, and diffusion effects of the blades are not ideal, resulting in limited overall performance of the wind wheel. Therefore, it is necessary to improve the structure of the wind wheel blades to improve the efficiency of the wind wheel, reduce noise, and meet diverse application requirements.

[0031] The following refers to the attached Figure 1 to the attached Figure 5 , and describes the lightweight rear-tilt wind wheel and fan of the embodiment of the present invention, which have good aerodynamic performance, can meet the requirements of lightweight design, and have high energy utilization efficiency.

[0032] Referring to Figures 1 to 5 , a lightweight rear-tilt wind wheel according to an embodiment of the first aspect of the present invention includes a wind wheel housing 100 and a plurality of blades 200. Each blade 200 is fixedly connected inside the wind wheel housing 100. All the blades 200 are evenly distributed along a circumferential trajectory around the wind wheel axis of the wind wheel housing 100. Each blade 200 is parallel to the wind wheel axis to achieve the driving effect of axial air inlet and radial air outlet, and can form a corresponding high-pressure air flow;

[0033] The blade 200 includes a wind-collecting root 210, a front wing 220, a middle wing 230, and a rear wing 240, all of which are arc-shaped sheets. The wind-collecting root 210, the front wing 220, the middle wing 230, and the rear wing 240 are connected to form a curved sheet structure that can smoothly guide the wind. The wind-collecting root 210 is fixedly connected to one side of the front wing 220 close to the wind wheel axis. The middle wing 230 is fixedly connected to the side of the front wing 220 away from the wind-collecting root 210. The rear wing 240 is connected to the side of the middle wing 230 away from the front wing 220. The wind-collecting center of the wind-collecting root 210 is located on the side of the blade 200 away from the wind wheel axis. The sheet-shaped wind-collecting root 210 bends around the wind-collecting axis passing through the wind-collecting center and parallel to the wind wheel axis. The wind-collecting root 210 is arranged in a forward-inclined manner. The front wing center of the front wing 220, the middle wing center of the middle wing 230, and the rear wing center of the rear wing 240 are all located on the side of the blade 200 close to the wind wheel axis. The sheet-shaped front wing 220 bends around the front wing axis passing through the front wing center and parallel to the wind wheel axis. The sheet-shaped middle wing 230 bends around the middle wing axis passing through the middle wing center and parallel to the wind wheel axis. The sheet-shaped rear wing 240 bends around the rear wing axis passing through the rear wing center and parallel to the wind wheel axis. The front wing 220, the middle wing 230, and the rear wing 240 are all arranged in a rearward-inclined manner. The front wing curvature of the front wing 220 is greater than the middle wing curvature of the middle wing 230, and the middle wing curvature is greater than the rear wing curvature of the rear wing 240, that is, the front wing radius of the front wing 220 is smaller than the middle wing radius of the middle wing 230, and the middle wing radius is smaller than the rear wing radius of the rear wing 240. By setting the outlet angles of the front wing 220, the middle wing 230, and the rear wing 240 to decrease in sequence and all be less than ninety degrees, the air flow on the blade 200 can be made smoother. Among them, the outlet angle, also known as the outlet inclination angle, refers to the inclination angle at the outlet of the blade 200, specifically the angle between the outer extension line of the blade 200 and the reverse tangent of the rotation direction of the blade 200 at this point.

[0034] By setting the blades 200 parallel to the wind turbine axis and each part having an arc-shaped structure, a radial air outlet effect can be formed. By setting the curvature of the front wing, middle wing, and rear wing to decrease in sequence, the air flow on the blades 200 can be made smoother, with good air acceleration and diffusion effects, effectively reducing flow resistance and energy loss. The blades 200 can meet the lightweight design, thereby reducing the load on the wind turbine, having a high energy utilization rate, and being able to more stably and smoothly guide air flow, thus improving the overall aerodynamic performance of the wind wheel. By reducing the impact and eddy current between the air and the blades 200, the generation and propagation of noise can also be reduced; in addition, the gradually decreasing curvature from the inside out can also effectively reduce the wind resistance on the outer peripheral area of the blades 200, effectively reducing the load on the rear wing part 240 with a longer lever arm. This rear-tilt wind wheel has less vibration and wear during operation, can not only effectively improve the stability and reliability of the operation of the rear wing part 240, but also effectively extend the service life of the rear wing part 240, with low maintenance costs;

[0035] By setting the wind collection center on the side of the blades 200 away from the wind turbine axis and the centers of each wing part on the side of the blades 200 close to the wind turbine axis, the wind collection root 210 can capture more air and spread it to the working areas of each wing part. While maintaining a large air volume, this rear-tilt wind wheel can effectively increase the wind pressure, thereby improving the overall efficiency; specifically, the wind collection root 210 is set to be forward-tilted, and the front wing part 220, middle wing part 230, and rear wing part 240 are all set to be rear-tilted. The wind collection root 210 has a stronger air collection effect, can form a wind guiding effect with a large air volume and high wind pressure, and the wind collection root 210 has a shorter lever arm compared to other wing parts, and can maintain a stable and reliable structure under high-load conditions, effectively improving the reliability of the wind guiding action, and the wind collection root 210 has a long service life.

[0036] It can be understood that the wind collection curvature of the wind collection root 210 is greater than the curvature of the front wing, that is, the wind collection radius of the wind collection root 210 is smaller than the front wing radius of the front wing part 220. Since the front wing part 220, middle wing part 230, and rear wing part 240 are all set to be rear-tilted, and the wind collection root 210 is set to be forward-tilted, by reducing the wind collection radius of the wind collection root 210, while ensuring the wind capture effect, the overall load on the wind collection root 210 can be effectively reduced, thereby effectively improving the stability of the structure of the wind collection root 210, and further improving the smoothness and reliability of the overall structure operation of the blades 200.

[0037] It can be understood that the air-collecting root 210, the front wing part 220, the middle wing part 230 and the rear wing part 240 are of an integrated structure, that is, the blade 200 as a whole is of an integrated structure. The surface of the blade 200 is smooth and fluent. By setting the air-collecting root 210, the front wing part 220, the middle wing part 230 and the rear wing part 240 to be of an integrated structure, and the connection and alignment between adjacent structural parts are smooth, the blade 200 forms a smooth and fluent surface, which can effectively reduce air resistance and energy loss, and the effect of guiding air flow is smooth, and can effectively reduce the vibration and wear during the operation of the wind wheel.

[0038] It can be understood that the connection line between the inlet end of the blade 200 and the outlet end of the adjacent blade 200 is perpendicular to the wind wheel axis, that is, the inlet end of each blade 200 and the outlet end of the corresponding adjacent blade 200 are arranged radially. Connect the wind wheel axis and the inlet end of one of the blades 200 radially, and this connection line must pass through the outlet end of the other blade 200. The inlet end refers to the end of the air-collecting root 210 far from the front wing part 220, and the outlet end refers to the end of the rear wing part 240 far from the middle wing part 230.

[0039] Projecting radially from the center of the wind wheel housing 100 towards the surroundings, the radial projections of the respective blades 200 are connected to form a coherent structure, which can effectively control the area and quantity of the blades 200 while ensuring the air capture volume, and can effectively save the input cost of materials.

[0040] It can be understood that since the axes of all the blades 200 are evenly distributed along a circular trajectory around the wind wheel axis of the wind wheel housing 100, and each blade 200 is parallel to the wind wheel axis, the outer edges of all the blades 200 are located on the same circle, the inner edges of all the blades 200 are located on the same circle, the curvature of the inner circle trajectory where the ends of all the air-collecting roots 210 far from the front wing part 220 are located is the inner ring curvature, and the rear wing curvature is less than the inner ring curvature. It can also be understood that the radius of the inner circle trajectory where the ends of all the air-collecting roots 210 far from the front wing part 220 are located is the inner ring radius, and the rear wing radius is greater than the inner ring radius.

[0041] By setting a sufficiently large rear wing radius, the air capture volume of the blade 200 as a whole can be effectively ensured, so as to effectively ensure the output effect of a large air volume. Combined with the fact that the outlet angles of the front wing part 220, the middle wing part 230 and the rear wing part 240 decrease in turn, the air guiding effect of the surface of the blade 200 on the air can be made smoother, and the efficiency of the overall rear-tilt wind wheel can be effectively improved.

[0042] It can be understood that the wind wheel housing 100 includes a rear cover 110 and an annular front ring 120. The rear cover 110 and the front ring 120 are respectively riveted and connected to opposite sides of each blade 200. By arranging a pressing piece to be connected between the front ring 120 and the rear cover 110 in a riveting manner, the manufacturing difficulty of the backward-inclined wind wheel can be effectively simplified, and the manufacturing cost can be reduced.

[0043] It can be understood that the front ring 120 is an annular plate structure. A flange ring 121 protruding away from the rear cover 110 is provided on the inner ring side of the front ring 120. A fixing and positioning portion 211 is provided on the side of the air collecting root 210 close to the front ring 120. The fixing and positioning portion 211 and the flange ring 121 are in mutual abutment. By arranging the flange ring 121 to cooperate with the fixing and positioning portion 211, the contact area between the blade 200 and the front ring 120 can be effectively increased, the pressure formed between the blade 200 and the front ring 120 during operation can be effectively reduced, the wind-catching load capacity of the whole backward-inclined wind wheel can be effectively improved, the stability during operation is strong, and the service life of the whole structure can be effectively prolonged.

[0044] It can be understood that 7 blades 200 are provided. By the backward-inclined wind wheel arranged in this solution, the number of the blades 200 can be effectively reduced. Preferably, it is set to 7, which can reduce the input of materials while ensuring the efficiency.

[0045] A fan according to an embodiment of the second aspect of the present invention includes the lightweight backward-inclined wind wheel according to any one of the embodiments of the first aspect above. The outlet angle of the blade 200 is less than a right angle, that is, the outlet angle at the end of the blade 200 is less than 90 degrees, and the main part of the blade 200 is a backward-inclined structure.

[0046] It can be understood that the fan further includes a driving motor. The wind wheel housing 100 is connected to the driving end of the driving motor, and the driving motor drives the blade 200 to rotate and work through the wind wheel housing 100.

[0047] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lightweight backward-inclined wind wheel, characterized in that: It comprises a wind rotor housing (100) and a plurality of blades (200), each of the blades (200) is connected to the wind rotor housing (100), all of the blades (200) are evenly distributed along a circular trajectory around the wind rotor axis of the wind rotor housing (100), and each of the blades (200) is parallel to the wind rotor axis; The blade (200) comprises a wind collecting root (210), a front wing (220), a middle wing (230) and a rear wing (240), all of which are arc-shaped sheets; the wind collecting root (210) is connected to a side of the front wing (220) close to the wind wheel axis, the middle wing (230) is connected to a side of the front wing (220) away from the wind collecting root (210), and the rear wing (240) is connected to a side of the middle wing (230) away from the front wing (220). The wind collecting center of the wind collecting root (210) is located on a side of the blade (200) away from the axis of the wind wheel, the front wing center of the front wing portion (220), the middle wing center of the middle wing portion (230), and the rear wing center of the rear wing portion (240) are all located on a side of the blade (200) close to the axis of the wind wheel, the front wing curvature of the front wing portion (220) is greater than the middle wing curvature of the middle wing portion (230), and the middle wing curvature is greater than the rear wing curvature of the rear wing portion (240).

2. A lightweight backward-inclined wind wheel according to claim 1, characterized in that: The wind collecting curvature of the wind collecting root (210) is greater than the curvature of the front wing.

3. The lightweight backward-inclined wind wheel according to claim 1, characterized in that: The wind collecting root (210), the front wing portion (220), the middle wing portion (230) and the rear wing portion (240) are an integrated structure, and the surface of the blade (200) is smooth.

4. The lightweight backward-inclined wind wheel according to claim 1, characterized in that: A line connecting an inlet end of the blade (200) and an outlet end of an adjacent blade (200) intersects perpendicularly with the axis of the wind wheel.

5. The lightweight backward-inclined wind wheel according to claim 1, characterized in that: The curvature of the inner circle trajectory of the end of all the wind collecting roots (210) away from the front wing portion (220) is an inner ring curvature, and the curvature of the rear wing is smaller than the inner ring curvature.

6. The lightweight backward-inclined wind wheel according to claim 1, characterized in that: The wind wheel housing (100) comprises a rear cover (110) and an annular front ring (120); the rear cover (110) and the front ring (120) are respectively riveted and connected to opposite sides of the blade (200).

7. A lightweight backward-inclined wind wheel according to claim 6, characterized in that: The inner ring side of the front ring (120) is provided with a flange ring (121) protruding away from the rear cover (110), and the side of the wind collecting root (210) close to the front ring (120) is provided with a reinforcing positioning portion (211), and the reinforcing positioning portion (211) is in contact with the flange ring (121).

8. The lightweight backward-inclined wind wheel according to claim 1, characterized in that: The blades (200) are provided in seven pieces.

9. A fan, characterized in that: It comprises a lightweight backward-inclined wind wheel as claimed in any one of claims 1 to 8, wherein the outlet angle of the blade (200) is smaller than a right angle.

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