Backward centrifugal wind wheel with high energy efficiency and low noise

Abstract

The utility model provides a backward centrifugal wind wheel with high energy efficiency and low noise, which comprises a base plate, a wheel cover and a plurality of blades uniformly distributed between the base plate and the wheel cover, and by combining the offset design of the blades with the optimization of a wing-shaped curve, the wind wheel has a lower rotating speed than a traditional centrifugal wind wheel under the same air volume, and the wind speed is improved. Therefore, the operation power is obviously reduced. The high-air-volume characteristic of the axial-flow fan blades is introduced into the centrifugal wind wheel through the offset faces, the air volume performance is improved, meanwhile, the rotating speed of the wind wheel is reduced, and noise is effectively reduced. The backward centrifugal wind wheel with high energy efficiency and low noise is successfully realized. According to the wind wheel, the operation power and the noise level are remarkably reduced while the high air volume performance is kept, and the wide application prospect is achieved.

Description

Technical Field

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

[0002] In the field of ventilation systems, high energy efficiency and low noise are the core objectives of turbomachinery design and key factors for enhancing product market competitiveness. Backward centrifugal impellers, as important components in ventilation systems, are widely used in various air handling equipment. However, existing backward centrifugal impellers still have certain shortcomings in practical applications. For example, the centrifugal impeller with publication number CN211950963U includes a cover plate and a base plate, with multiple blades between the base plate and the cover plate. The base plate and the cover plate are connected by the blades to maximize the centrifugal impeller's function. However, its standard blade structure design limits aerodynamic performance to the geometry and layout of the blades, resulting in high power consumption during operation. Furthermore, pressure losses due to airflow reversal and structural resistance easily lead to high noise levels.

[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, low-noise 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, low-noise backward centrifugal impeller, including a backward centrifugal impeller body. The body includes a chassis, a wheel cover, and multiple blades evenly distributed between the chassis and the wheel cover. The wheel cover is provided with an air inlet. The body is divided into multiple air outlets in the radial direction by the blades. The blades are configured such that the side away from the air inlet and the side close to the air inlet are offset by a radial distance L, so that the windward side of the blade forms a backward-inclined offset surface.

[0006] As a further optimization, the offset distance L is greater than 3mm and less than 10mm.

[0007] As a further optimization, the extension angle between the two ends of the blade near the air inlet is in the range of 58° to 64°.

[0008] As a further optimization, the extension angle between the two ends of the blade on the side away from the air inlet is in the range of 68° to 74°.

[0009] As a further optimization, the radial section of the blade is airfoil-shaped.

[0010] As a further optimization, the mid-arc angle of the airfoil curve on the side of the blade away from the air inlet increases linearly from the air inlet angle to the air outlet angle.

[0011] As a further optimization, the air inlet angle of the middle arc of the airfoil curve on the side of the blade away from the air inlet is in the range of 50° to 54°.

[0012] As a further optimization, the air outlet angle of the middle arc of the airfoil curve on the side of the blade away from the air inlet is in the range of 64° to 70°.

[0013] As a further optimization, the wheel cover is arranged in an arc shape on the side near the blade.

[0014] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0015] This application provides a high-efficiency, low-noise backward-curved centrifugal impeller, comprising a chassis, a wheel cover, and multiple blades evenly distributed between the chassis and the wheel cover. Through an offset design of the blades combined with airfoil curve optimization, the impeller achieves a lower rotational speed than traditional centrifugal impellers at the same airflow rate, thus significantly reducing operating power. It introduces the high airflow characteristics of axial blades into the centrifugal impeller through the offset surface, improving airflow performance while reducing the impeller's rotational speed, thereby effectively reducing noise. Furthermore, the linear transition design of the mid-curve angle reduces structural drag from airflow reversal, further reducing noise during operation. Finally, the optimized extension angle design ensures the best match between blade length and aerodynamic performance, avoiding increased friction due to excessively long airflow channels. In summary, this application successfully realizes a high-efficiency, low-noise backward-curved centrifugal impeller through a special blade structure design, including optimization of the offset surface, extension angle, and airfoil curve. This impeller significantly reduces operating power and noise levels while maintaining high airflow performance, and has broad application prospects. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of a high-efficiency, low-noise backward centrifugal impeller according to this utility model;

[0018] Figure 2 This is a cross-sectional structural schematic diagram of a high-efficiency, low-noise backward centrifugal impeller according to the present invention.

[0019] Figure 3 This is a schematic diagram showing the offset distance and extension angle positions of this utility model;

[0020] Figure 4 This is a schematic diagram of the position of the middle arc line of this utility model;

[0021] The markings in the diagram are: 1. Chassis; 2. Wheel cover; 3. Blade; 4. Air inlet; 5. Air outlet; 6. Mid-curve. Detailed Implementation

[0022] 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.

[0023] Depend on Figures 1 to 4 As shown, this embodiment of the invention provides a high-efficiency, low-noise backward centrifugal impeller. The impeller body comprises a chassis 1, a wheel cover 2, and multiple blades 3 evenly distributed between the chassis 1 and the wheel cover 2. The wheel cover 2 has an air inlet 4 for introducing airflow. In the radial direction, the blades 3 divide the impeller into multiple air outlets 5 to guide and distribute the airflow. Preferably, the core of the blade profile structure of the blades 3 lies in the radial offset distance L between the side away from the air inlet 4 and the side near the air inlet 4. The blade profile curve near the air inlet 4 is the result of the offset of the blade profile curve away from the air inlet 4. This offset causes the windward surface of the blades 3 to form a backward-inclined offset surface. The presence of this offset surface adds a vector component along the airflow direction to the blades 3, thereby giving the backward centrifugal impeller certain axial flow characteristics, improving airflow performance, and achieving a lower rotational speed than a centrifugal impeller of the same size at the same airflow, thus resulting in lower noise. In practical applications, when the impeller is running, the offset surface can significantly reduce the energy loss generated during the airflow turning process after entering through the air inlet 4, thereby improving overall aerodynamic efficiency. For example, in home air purifiers, using this impeller can reduce the rotation speed under the same airflow conditions, thereby reducing operating noise and improving the user experience.

[0024] Preferably, the extension angle between the two ends of the blade 3 on the side closest to the air inlet 4 is defined as the first blade 3 extension angle A, with an angle range of 58° to 64°. The extension angle between the two ends of the blade 3 on the side furthest from the air inlet 4 is defined as the second blade 3 extension angle B, with an angle range of 68° to 74°. The design of the extension angle requires finding the optimal balance between the blade 3 length and aerodynamic performance. A larger extension angle results in a relatively longer blade 3, thus providing a longer airflow channel, which can enhance aerodynamic performance. However, an excessively long airflow channel increases friction, leading to energy loss and negatively impacting aerodynamic efficiency. Therefore, the first blade 3 extension angle A and the second blade 3 extension angle B are respectively limited to the above ranges, ensuring the aerodynamic performance of the blade 3 while avoiding efficiency reduction due to an excessively long airflow channel.

[0025] Preferably, the radial cross-section of the blade 3 is airfoil-shaped, and the angle of the mid-arc line 6 of the airfoil curve on the side of the blade 3 away from the air inlet 4 increases linearly from the inlet angle to the outlet angle. Further, the inlet angle C of the mid-arc line 6 ranges from 50° to 54°, and the outlet angle D of the mid-arc line 6 ranges from 64° to 70°. Specifically, in this embodiment, the inlet angle of the mid-arc line 6 is 52°, and the outlet angle of the mid-arc line 6 is 66°. The linear transition of the mid-arc line 6 from a small inlet angle to a large outlet angle allows the airflow to smoothly change direction when passing over the surface of the blade 3, reducing the structural drag caused by airflow deflection, improving aerodynamic efficiency, and thus reducing noise. Furthermore, the larger outlet angle design of this application gives the impeller the characteristics of low wind pressure and high air volume, making it suitable for various ventilation system scenarios.

[0026] Preferably, the wheel cover 2 is arc-shaped on the side near the blade 3. This design optimizes the airflow path and reduces airflow resistance. At the same time, the chassis 1 is concave, and an arc-shaped guide is also provided on the side near the inside of the wind turbine. The arc shape allows the airflow to move along a smoother trajectory when entering the wind turbine, thereby reducing energy loss and noise caused by airflow impact or turbulence.

[0027] In practical applications, the operating principle of this invention's wind turbine is as follows: Airflow enters the wind turbine through the inlet 4 and then flows along the airflow channel between the blades 3. Due to the offset surface design of the blades 3, the airflow acquires a vector component along the outlet direction during flow, which enhances the wind turbine's airflow output capability. Simultaneously, the presence of the offset surface allows the wind turbine to operate at a lower speed than traditional centrifugal wind turbines under the same airflow conditions, thereby reducing airflow noise caused by high-speed rotation. Furthermore, the extension angle design of the blades 3 ensures a moderate length of the airflow channel, improving aerodynamic performance while avoiding energy loss due to increased friction. The linear transition design of the airfoil's mid-curve 6 angle further optimizes the airflow path, reducing pressure loss during airflow reversal and improving overall aerodynamic efficiency.

[0028] To verify the technical effectiveness of this invention, multiple sets of comparative experiments were conducted. See the table below:

[0029] No bias 5mm offset 10mm offset <![CDATA[Air volume m 3 / h]]> 298 300 297 Power W 25 24.4 24

[0030] Analysis shows that in this experiment, by setting the experimental conditions to a similar airflow output range (297-300m³), the effectiveness of the experiment was achieved. 3 The operating power and noise levels were tested under three conditions: no offset, 5mm offset, and 10mm offset. The results showed that the operating power was 25W under no offset condition; with a 5mm offset, the operating power dropped to 24.4W; and with a 10mm offset, the operating power further decreased to 24W. This indicates that a proper blade offset design has a significant effect on improving the wind turbine's energy efficiency. By setting an appropriate offset surface, the airflow trajectory within the wind turbine can be altered, allowing the airflow to achieve greater velocity and pressure increments under centrifugal force. This increases the wind turbine's airflow and pressure output at the same turbine rotation speed, improving the overall performance of the turbine. Simultaneously, optimized airflow and reduced airflow turbulence help reduce the impact and vibration between the airflow and the blades, allowing the airflow to pass more gently through the turbine, thereby effectively reducing the noise generated during wind turbine operation.

[0031] Meanwhile, the wind turbine of this invention also has good adaptability to manufacturing processes. Although a larger offset distance improves wind turbine performance, an excessively large offset distance increases manufacturing difficulty. Considering both performance and process feasibility, this invention limits the offset distance to the range of 3-10mm. An offset distance within this range significantly improves wind turbine performance without substantially increasing manufacturing costs. In actual production, the offset surface design of blade 3 can be achieved through precision machining technology, and the overall assembly of the wind turbine can be completed using automated assembly processes, thereby ensuring product consistency and reliability.

[0032] In summary, this invention successfully achieves a high-efficiency, low-noise backward centrifugal impeller through the synergistic optimization of the offset surface, extension angle, and airfoil curve. This impeller significantly reduces operating power and noise levels while maintaining high airflow performance, and has broad application prospects.

[0033] 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-efficiency, low-noise backward centrifugal impeller, comprising a backward centrifugal impeller body, the body including a chassis, a wheel cover, and a plurality of blades evenly distributed between the chassis and the wheel cover, the wheel cover having an air inlet, and the body having a plurality of air outlets radially separated by the blades, characterized in that, The blade has a blade shape structure in which the radial offset distance between the side away from the air inlet and the side close to the air inlet is L, so that the windward side of the blade forms a backward-tilted offset surface.

2. The high-efficiency, low-noise backward centrifugal impeller according to claim 1, characterized in that... The offset distance L is greater than 3mm and less than 10mm.

3. The high-efficiency, low-noise backward centrifugal impeller according to claim 1, characterized in that... The extension angle between the two ends of the blade near the air inlet is in the range of 58° to 64°.

4. The high-efficiency, low-noise backward centrifugal impeller according to claim 1, characterized in that... The extension angle between the two ends of the blade away from the air inlet ranges from 68° to 74°.

5. A high-efficiency, low-noise backward centrifugal impeller according to claim 1, characterized in that... The radial cross-section of the blade is airfoil-shaped.

6. A high-efficiency, low-noise backward centrifugal impeller according to claim 5, characterized in that... The angle of the mid-arc curve of the airfoil curve on the side of the blade away from the air inlet increases linearly from the air inlet angle to the air outlet angle.

7. A high-efficiency, low-noise backward centrifugal impeller according to claim 6, characterized in that... The air inlet angle of the airfoil curve on the side of the blade away from the air inlet is in the range of 50° to 54°.

8. A high-efficiency, low-noise backward centrifugal impeller according to claim 6, characterized in that... The air outlet angle of the airfoil curve on the side of the blade away from the air inlet is in the range of 64° to 70°.

9. A high-efficiency, low-noise backward centrifugal impeller according to claim 1, characterized in that... The wheel cover is arc-shaped on the side closest to the blade.

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