High-energy-efficiency backward centrifugal wind wheel

Abstract

The utility model provides a backward centrifugal wind wheel with high energy efficiency. The backward centrifugal wind wheel comprises a chassis, a wheel cover and a plurality of blades, the blades extend outwards at the airflow outlet end to form an extension part, the extension part sequentially comprises a first air outlet angle face, a transition angle face and a second air outlet angle face from top to bottom, and the first air outlet angle face, the transition angle face and the second air outlet angle face jointly form a retroverted structure. The design of the retroverted structure obviously optimizes the dynamic characteristics of airflow, and the design of large and small air outlet angles and a transition angle surface is combined, so that the flow resistance is effectively reduced, and the energy efficiency ratio of the wind wheel is improved. The wind wheel not only can achieve high-air-volume output under the low-power condition, but also has excellent aerodynamic performance and structural strength, and is suitable for various application scenes.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and more specifically, to a high-efficiency backward centrifugal wind turbine. Background Technology

[0002] With the increasing global demand for energy conservation and emission reduction, improving energy efficiency has become a key direction in the research and development of small household appliances. Centrifugal impellers, as a common core component in small household appliances, directly affect the overall energy efficiency of the equipment. Existing centrifugal impellers typically employ a traditional arc-shaped blade design, such as the centrifugal impeller with publication number CN211950963U, which includes a cover plate and a base plate, with multiple blades positioned between the base plate and the cover plate, connected by the blades. While this design can meet basic airflow requirements, it has significant shortcomings in practical applications. For example, the traditional blade structure easily generates significant flow resistance when airflow passes through, resulting in high energy consumption and limited airflow output, making it difficult to meet the requirements of high efficiency and energy saving. Furthermore, the single outlet angle design makes it difficult to simultaneously meet the needs of large airflow drive and low power consumption, thus limiting the overall energy efficiency ratio.

[0003] In view of this, the applicant hereby submits this application after studying the existing technology. Utility Model Content

[0004] This invention provides a high-efficiency backward centrifugal impeller, which aims to improve at least one of the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, this utility model provides a high-efficiency backward centrifugal impeller, including a chassis, a wheel cover and multiple blades. The blades are evenly spaced around the axis of the chassis. The blades extend outward at the airflow outlet end to form an extension portion. The extension portion forms a first air outlet angle surface, a transition angle surface and a second air outlet angle surface from top to bottom, wherein the air outlet angle of the first air outlet angle surface is α and the air outlet angle of the second air outlet angle surface is β, satisfying α < β.

[0006] As a further optimization, the air outlet angle α of the first air outlet face is 54° to 58°.

[0007] As a further optimization, the air outlet angle β of the second air outlet face is 66° to 72°.

[0008] As a further optimization, the leading edge of the blade is formed with a cutting edge, and the thickness of the cutting edge gradually increases from the outer end toward the middle of the blade.

[0009] As a further optimization, the thickness of the middle part of the blade is 2-3.5 mm.

[0010] As a further optimization, the thickness of the outer end of the cutting edge is 0.4-0.7 mm.

[0011] As a further optimization, the chassis is recessed, and the center of the chassis has rounded corners.

[0012] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0013] This application provides a high-efficiency backward-curved centrifugal impeller, comprising a chassis, a wheel cover, and multiple blades. The blades extend outward at the airflow outlet to form an extension, which, from top to bottom, includes a first outlet angle surface, a transition angle surface, and a second outlet angle surface, together forming a backward-curved structure. This backward-curved structure significantly optimizes the airflow dynamics. Combined with the design of the large and small outlet angles and the transition angle surface, it effectively reduces flow resistance and improves the impeller's energy efficiency ratio. The impeller not only achieves high airflow output under low-power conditions but also possesses excellent aerodynamic performance and structural strength, making it suitable for various application scenarios. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a high-efficiency backward centrifugal impeller according to the present invention;

[0016] Figure 2 This is a cross-sectional structural schematic diagram of a high-efficiency backward centrifugal impeller according to the present invention;

[0017] Figure 3 This is a schematic diagram of the air outlet angle of this utility model;

[0018] The markings in the diagram are: 1. Chassis; 2. Wheel cover; 3. Blade; 4. Air inlet; 5. Outer extension; 6. First air outlet angle; 7. Transition angle; 8. Second air outlet angle; 9. Middle part; 10. Edge; 11. Rounded corner. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Depend on Figures 1 to 3 As shown, this embodiment of the invention provides a high-efficiency backward-curved centrifugal impeller, including a chassis 1, a wheel cover 2, and multiple blades 3. The blades 3 are evenly distributed between the chassis 1 and the wheel cover 2, and are circumferentially spaced around the axis of the chassis 1. An air inlet 4 is provided on the wheel cover 2 for airflow to enter the impeller; simultaneously, the impeller is radially divided into multiple air outlet channels by the blades 3 for discharging the accelerated airflow. The blades 3 extend outward at the airflow outlet end to form an extension 5, which, from top to bottom, includes a first outlet angle surface 6, a transition angle surface 7, and a second outlet angle surface 8, together forming a backward-curved structure. This backward-curved structure design significantly optimizes the dynamic characteristics of the airflow, reduces flow resistance, and improves overall energy efficiency.

[0021] Preferably, the outlet angle of the first outlet facet 6 is α, and the outlet angle of the second outlet facet 8 is β, and α < β must be satisfied. In this embodiment, specifically, α is set to 54°~58°, and β is set to 66°~72°. The small outlet angle design of the first outlet facet 6 allows the airflow to obtain a larger torque upon contact, thereby driving a higher air volume output. The large outlet angle design of the second outlet facet 8 effectively reduces the power requirement. At the same time, the tip of the second outlet facet 8 extends to the bottom of the chassis 1, which can more effectively guide the airflow, reduce the turbulence and backflow phenomenon of the airflow around the rearward centrifugal impeller, and improve the orderliness of the airflow. The transition facet 7 is located between the first outlet facet 6 and the second outlet facet 8. It can provide a directional vector for the airflow in the axial direction, make fuller use of the space inside the impeller, enhance the uniformity and stability of the airflow, and reduce the dead zone and vortex of the airflow between the blades 3. Through the synergistic effect of the above three surfaces, a backward-sloping structure is formed, which reduces the turbulence and resistance of the airflow inside the wind turbine, allowing the airflow to pass through the wind turbine more smoothly and achieving the performance goal of low power and high air volume.

[0022] Furthermore, the thickness of the middle section 9 of blade 3 is designed to be between 2mm and 3.5mm to ensure sufficient structural strength during high-speed rotation, while avoiding airflow obstruction due to excessive thickness. In addition, a cutting edge 10 is formed at the leading edge of blade 3, with its thickness gradually increasing from the outer end towards the middle section 9, where the outer end has a thickness of 0.4mm to 0.7mm. This design significantly reduces local turbulence when airflow impacts the leading edge of blade 3, thereby reducing the impact of structural drag on aerodynamic performance. Experimental verification shows that this cutting edge 10 design can reduce the power loss of the wind turbine by approximately 10% under the same airflow conditions.

[0023] The chassis 1 is recessed, and a rounded corner 11 is provided in the middle of the end near the air inlet 4. The design of the rounded corner 11 reduces local turbulence when the airflow enters the impeller, improves the smoothness of guiding the airflow to the airflow channel between the blades 3, and thus optimizes the overall aerodynamic performance.

[0024] Regarding the operating principle of this backward centrifugal impeller, the airflow first enters the impeller through the inlet 4, and is accelerated radially and changes direction under the action of the blades 3. When the airflow contacts the first outlet facet 6, due to its small outlet angle design, the airflow obtains a large torque, thereby driving a higher air volume output. Subsequently, the airflow passes through the transition facet 7, and the axial direction vector provided by the transition facet 7 further stabilizes the airflow direction, improves the uniformity of the airflow, and reduces the generation of eddies. Finally, the airflow is discharged through the second outlet facet 8, whose large outlet angle design effectively reduces the power requirement. Through the above steps, the impeller achieves a combination of high air volume and low power, thereby significantly improving the energy efficiency ratio.

[0025] To verify the actual effectiveness of this invention, several tests were conducted. The test conditions were set at an air volume of 300 m³ / h. 3 The results showed that the power consumption of the wind turbine of this invention was reduced by 10% compared to that of a conventional arc-shaped blade wind turbine, from 27.5W to 25W. This indicates that the wind turbine of this invention can significantly reduce energy consumption and meet the requirements of energy conservation and emission reduction under the premise of the same air volume output.

[0026] Furthermore, the high-efficiency backward centrifugal impeller of this invention is applicable to high-efficiency fan systems in the field of small household appliances. For example, in air purifiers, this impeller can achieve high airflow output under low power conditions while maintaining excellent aerodynamic performance and structural strength. In practical applications, users can control the working state of the impeller by adjusting the motor speed, thereby adapting to different purification needs.

[0027] In summary, this invention solves the problems of high flow resistance and low energy efficiency in existing technologies by optimizing the overall structural design of the impeller and the specific parameter configuration of the blades 3. Specifically, by introducing a backward-curved structure, combining large and small outlet angles, and designing the transition angle surface 7, the flow resistance is significantly reduced and the energy efficiency ratio of the impeller is improved. In addition, by optimizing the thickness of the blades 3 and the design of the cutting edge 10, local turbulence during airflow impact is further reduced, improving the overall aerodynamic performance. The concave setting of the chassis 1 and the rounded corner design 11 further optimize the smoothness of airflow entry. Ultimately, the impeller of this invention can not only achieve high air volume output under low power conditions, but also has excellent aerodynamic performance and structural strength, making it suitable for various application scenarios.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high energy efficient backward centrifugal wind rotor, characterized in that, The fan comprises a base, a wheel cover and a plurality of blades which are evenly spaced around the axis of the base; the blades extend outwardly at the air outlet end to form an outward extension, the outward extension is formed with a first air outlet corner surface, a transition corner surface and a second air outlet corner surface from top to bottom, wherein the air outlet angle of the first air outlet corner surface is α, the air outlet angle of the second air outlet corner surface is β, and α < β.

2. A high energy efficient backward centrifugal wind wheel according to claim 1, characterized in that The air outlet angle α of the first air outlet corner surface is 54°-58°.

3. A high energy efficient backward centrifugal wind turbine according to claim 1, characterized in that The air outlet angle β of the second air outlet corner surface is 66°-72°.

4. A high energy efficient backward centrifugal wind turbine according to claim 1, characterized in that The leading edge end of the blade is formed with a blade edge portion, the thickness of the blade edge portion gradually increases from the outer end to the middle portion of the blade.

5. A high energy efficient backward centrifugal wind turbine according to claim 4, characterized in that The thickness of the middle portion of the blade is 2-3.5mm.

6. A high energy efficient backward centrifugal wind turbine according to claim 5, characterized in that The thickness of the outer end of the blade edge portion is 0.4-0.7mm.

7. A high energy efficient backward centrifugal wind turbine according to claim 1, characterized in that The base is concave, and the middle portion of the base is formed with a rounded corner portion.

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