Impeller having stability-enhancing and noise-reducing structure, and fan using same
Patent Information
- Application Number
- PCT/CN2025/139033
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-20
- Filing Date
- 2025-12-01
- Publication Date
- 2026-08-27
Smart Images
Figure CN2025139033_27082026_PF_FP_ABST
Abstract
Description
An impeller with a stability-enhancing and noise-reducing structure and a fan using it. Technical Field
[0001] This invention relates to the field of fluid machinery technology, specifically to an impeller with a stabilization and noise reduction structure, and more specifically to a fan using the same. Background Technology
[0002] Fans are commonly used for ventilation, dust removal, and cooling. They are characterized by their small size, simple structure, good ventilation effect, and economic efficiency, and are closely related to people's living environment. During operation, fans generate uneven pressure pulsations, resulting in aerodynamic noise and vibration. However, the structural and layout design of the impeller blades can improve the dynamic characteristics after stall, delay the occurrence of stall, and significantly reduce broadband noise and instability caused by turbulent interference. Therefore, optimizing the impeller design is essential.
[0003] The prior art CN2839671Y discloses a booster axial flow fan, including an impeller 1, impeller blades 2, and a motor 3. The impeller 1 is composed of 6 arc-shaped impeller blades 2 and a core-type hub. The blade roots 10 of the impeller blades are welded to the outer side of the core. Each impeller blade working surface is provided with two arc-shaped booster guide vanes 4. The guiding direction of each booster guide vane is from the leading edge 8 of the impeller blade to the trailing edge 9 of the impeller blade and spans across the impeller blade. The bottom of each booster guide vane 4 is connected to the side wall of the working surface of the impeller blade. One booster guide vane 4 is located in the middle part of the working surface of the impeller blade, and the other booster guide vane 4 is located on the end side wall of the blade tip 11 (the end of the working surface of the impeller blade). Due to the function of the booster vane 4, the airflow entering the impeller blade working surface cannot be directly discharged from the impeller blade. Furthermore, due to the restriction of the arc-shaped booster vane 4, more energy can be absorbed from the impeller blade and the booster vane, thus achieving higher wind pressure and wind speed. Moreover, due to the obstruction of the booster vane on the tip edge of the impeller blade, the airflow entering the impeller blade working surface cannot overflow radially from the impeller blade. Therefore, the airflow entering the impeller blade working surface can absorb energy more fully, thereby ensuring that the impeller has higher boosting efficiency.
[0004] However, the above-mentioned impeller structure has design limitations, involving only the design of some non-general impeller structures without fundamentally changing the impeller structure. It has poor adaptability, large flow losses, poor stability, high surge, high noise, and low efficiency. Therefore, in order to address these problems, the applicant proposes an impeller with a stability-enhancing and noise-reducing structure and a fan using it to solve the above-mentioned problems, reduce surge, noise, and instability, and thus improve operating performance and efficiency. Summary of the Invention
[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an impeller with a stability-enhancing and noise-reducing structure and a fan using the same.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] An impeller with a stabilizing and noise-reducing structure includes a hub, blades, and an outer ring. The blades are evenly distributed along the circumference and installed between the hub and the outer ring to form the impeller. The impeller is characterized by having a first guide rib and a second guide rib on the positive or negative pressure surface of the blades. The first guide rib is located radially outward of the blade, and the second guide rib is located radially inward of the blade. Both the first and second guide ribs are straight plate-type guide ribs. On the positive or negative pressure surface of the blade, the flow channel A formed by the first and second guide ribs along the airflow direction is a gradually expanding flow channel. The first and second guide ribs are located away from the blade. One end of the blade with positive or negative pressure is inclined toward flow channel A, forming a gradually narrowing flow channel B that extends from the positive or negative pressure surface toward the side away from the positive or negative pressure surface; the trailing edge of the blade is provided with a serrated structure; the inlet ends of the first and second guide ribs correspond to the leading edge of the blade, and the outlet ends of the first and second guide ribs correspond to the serrated structure of the trailing edge of the blade; the inlet radius of the impeller is R, the distance from the inlet end of the first guide rib to the central axis is R1, and the distance from the inlet end of the second guide rib to the central axis is R2, where R1 > 0.5R and R2 < 0.5R.
[0008] Furthermore, the first guide rib and the second guide rib have different thicknesses in the radial direction.
[0009] Furthermore, the radial thickness of the first guide rib is greater than the radial thickness of the second guide rib.
[0010] Furthermore, R1 = (0.6 ~ 0.8) R.
[0011] Furthermore, R2 = (0.35~0.45) R.
[0012] Furthermore, the width of channel A in the inlet direction is L1, and the width in the outlet direction is W1, where 1.5L1 < W1 < 3L1.
[0013] Furthermore, the width of the flow channel B away from the positive or negative pressure surface is L2, and the width close to the positive or negative pressure surface is W2, where 1.2L2 < W2 < 2.5L2.
[0014] Furthermore, W1 > W2.
[0015] A fan includes a motor consisting of a stator and a rotor, a collector, a flow guide, and a controller; the flow guide includes ring ribs and flow guide ribs, which are arranged alternately to form a flow guide structure; the fan includes the impeller with the aforementioned stability and noise reduction structure.
[0016] Furthermore, the fairing is a one-piece cast structure.
[0017] Furthermore, the collector outlet end is inserted into the impeller outer ring.
[0018] Furthermore, an auxiliary flow channel is formed between the outer wall of the collector and the inner wall of the outer ring of the impeller.
[0019] This invention discloses an impeller with a stabilizing and noise-reducing structure and a fan using the same, comprising a hub, blades, and an outer ring of the impeller; the blades are evenly distributed along the circumference and installed between the hub and the outer ring of the impeller to form the impeller; characterized in that: a first guide rib and a second guide rib are provided on the positive or negative pressure surface of the blade, the first guide rib being located on the radially outer side of the blade, and the second guide rib being located on the radially inner side of the blade, both the first and second guide ribs being straight plate-type guide ribs; on the positive or negative pressure surface of the blade, the flow channel A formed by the first and second guide ribs along the airflow direction is a gradually expanding flow channel; the first guide rib and the second guide rib... The ends of the guide ribs away from the positive or negative pressure surface of the blades are inclined towards flow channel A, forming a gradually narrowing flow channel B that extends from the positive or negative pressure surface to the side away from it. The trailing edge of the blades has a serrated structure. The inlet ends of the first and second guide ribs correspond to the leading edge of the blades, and the outlet ends of both guide ribs correspond to the serrated structure of the trailing edge of the blades. The impeller inlet radius is R, the distance from the inlet end of the first guide rib to the central axis is R1, and the distance from the inlet end of the second guide rib to the central axis is R2, where R1 > 0.5R and R2 < 0.5R. Due to improvements to the impeller and the fans using it, problems such as poor adaptability, high flow loss, poor stability, high surge, high noise, and low efficiency have been solved, improving operating performance and efficiency. Attached Figure Description
[0020] Figure 1 is a schematic diagram of the axial cross-sectional structure of the wind turbine;
[0021] Figure 2 is a top view of the impeller structure;
[0022] Figure 3 is a schematic diagram of the cross-sectional structure of flow channel A;
[0023] Figure 4 is a schematic diagram of the cross-sectional structure of flow channel B.
[0024] In the diagram: 1. Hub; 2. Blade; 3. Impeller outer ring; 4. Flow channel A; 5. Flow channel B; 6. Motor; 7. Stator; 8. Rotor; 9. Collector; 10. Flow guide shroud; 11. Ring rib; 12. Flow guide rib; 13. Controller; 14. First guide rib; 15. Second guide rib; 16. Inlet radius R of the impeller; 17. Distance R1 from the inlet end of the first guide rib 81 to the central axis; 18. Distance R2 from the inlet end of the second guide rib 82 to the central axis; 19. Width L1 of flow channel A in the inlet direction; 10. Width W1 of flow channel A in the outlet direction; 10. Width L2 of flow channel B away from the positive or negative pressure surface; 11. Width W2 of flow channel B near the positive or negative pressure surface. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0026] The present invention will now be described in further detail with reference to the accompanying drawings.
[0027] As shown in Figures 1-4, an impeller with a stabilizing and noise-reducing structure includes a hub 1, blades 2, and an outer ring 3. The blades 2 are evenly distributed along the circumference and installed between the hub 1 and the outer ring 3 to form the impeller. The impeller is characterized by having a first guide rib 81 and a second guide rib 82 on the positive or negative pressure surface of the blades 2. The first guide rib 81 is located radially outward of the blade 2, and the second guide rib 82 is located radially inward of the blade 2. Both the first guide rib 81 and the second guide rib 82 are straight plate-type guide ribs. On the positive or negative pressure surface of the blades, the flow channel A formed by the first guide rib 81 and the second guide rib 82 along the airflow direction is a gradually expanding flow channel. The ends of the first guide rib 81 and the second guide rib 82 that are away from the positive or negative pressure surface of the blade are inclined towards the flow channel A, forming a gradually narrowing flow channel B that extends from the positive or negative pressure surface to the side away from the positive or negative pressure surface; the trailing edge of the blade 2 is provided with a serrated structure; the inlet ends of the first guide rib 81 and the second guide rib 82 are both corresponding to the leading edge of the blade 2, and the outlet ends of the first guide rib 81 and the second guide rib 82 are both corresponding to the serrated structure of the trailing edge of the blade 2; the inlet radius of the impeller is R, the distance from the inlet end of the first guide rib 81 to the central axis is R1, and the distance from the inlet end of the second guide rib 82 to the central axis is R2, where R1 > 0.5R and R2 < 0.5R.
[0028] The shape and structure of the impeller significantly affect aerodynamic efficiency. Fluid enters the impeller through a variable-diameter flow channel, and the geometric characteristics of the impeller blades cause the distribution of relative fluid velocity, affecting the flow pattern and ultimately impacting losses and efficiency due to vibration and noise. The impeller in this application differs from conventional impellers in the prior art. The applicant's research revealed that the quality of the impeller blade structure design directly affects the intensity of surge noise, etc. To address these issues, the applicant optimized the impeller blade structure, employing a combination of guide ribs and a gradually expanding or contracting flow path structure to form the first guide rib 81 and the second guide rib 82. This guide rib structure accelerates fluid movement, reduces fluid residence time within the blades, and mitigates the impact of surge noise, etc. Furthermore, the straight-plate guide rib design makes the fluid flow path more stable, reducing the possibility of surge noise concentrating in a specific area and thus reducing its impact. Additionally, the serrated trailing edge structure further helps reduce vibration and maintain fan stability.
[0029] Furthermore, the first guide rib 81 and the second guide rib 82 have different thicknesses in the radial direction.
[0030] Furthermore, the radial thickness of the first guide rib 81 is greater than the radial thickness of the second guide rib 82.
[0031] Considering that surge noise on the radial outer side would be relatively greater, in order to reduce the adverse effects on the outer side, the applicant found that the thickness of the guide rib in the radial direction could also reduce the possibility of surge noise at a certain point to some extent.
[0032] Furthermore, R1 = (0.6 ~ 0.8) R.
[0033] Furthermore, R2 = (0.35~0.45) R.
[0034] Furthermore, the width of channel A in the inlet direction is L1, and the width in the outlet direction is W1, where 1.5L1 < W1 < 3L1.
[0035] Furthermore, the width of the flow channel B away from the positive or negative pressure surface is L2, and the width close to the positive or negative pressure surface is W2, where 1.2L2 < W2 < 2.5L2.
[0036] Furthermore, W1 > W2.
[0037] Blade shape and flow channel structure play a crucial role in improving flow patterns, helping to reduce vibration and noise and stabilize fluid flow.
[0038] A fan includes a motor 4 consisting of a stator 41 and a rotor 42, a collector 5, a flow guide 6, and a controller 7; the flow guide 6 includes ring ribs 61 and flow guide ribs 62, which are arranged alternately to form a flow guide structure; the fan includes the impeller with the aforementioned stability and noise reduction structure.
[0039] Furthermore, the fairing 6 is a one-piece cast structure.
[0040] Furthermore, the outlet end of the collector 5 is inserted into the outer ring 3 of the impeller.
[0041] Furthermore, an auxiliary flow channel is formed between the outer wall of the collector 5 and the inner wall of the impeller outer ring 3.
[0042] The flow guide shroud 6, composed of the ring rib 61 and the flow guide rib 62, plays a significant role in improving the flow efficiency, and also greatly reduces noise and increases stability.
[0043] This invention discloses an impeller with a stabilizing and noise-reducing structure and a fan using the same, comprising a hub, blades, and an outer ring of the impeller; the blades are evenly distributed along the circumference and installed between the hub and the outer ring of the impeller to form the impeller; characterized in that: a first guide rib and a second guide rib are provided on the positive or negative pressure surface of the blade, the first guide rib being located on the radially outer side of the blade, and the second guide rib being located on the radially inner side of the blade, both the first and second guide ribs being straight plate-type guide ribs; on the positive or negative pressure surface of the blade, the flow channel A formed by the first and second guide ribs along the airflow direction is a gradually expanding flow channel; the first guide rib and the second guide rib... The ends of the guide ribs away from the positive or negative pressure surface of the blades are inclined towards flow channel A, forming a gradually narrowing flow channel B that extends from the positive or negative pressure surface to the side away from it. The trailing edge of the blades has a serrated structure. The inlet ends of the first and second guide ribs correspond to the leading edge of the blades, and the outlet ends of both guide ribs correspond to the serrated structure of the trailing edge of the blades. The impeller inlet radius is R, the distance from the inlet end of the first guide rib to the central axis is R1, and the distance from the inlet end of the second guide rib to the central axis is R2, where R1 > 0.5R and R2 < 0.5R. Due to improvements to the impeller and the fans using it, problems such as poor adaptability, high flow loss, poor stability, high surge, high noise, and low efficiency have been solved, improving operating performance and efficiency.
Claims
1. An impeller with a noise reduction and stability enhancement structure, comprising a hub (1), blades (2), and an outer ring (3); the blades (2) are evenly distributed along the circumference and installed between the hub (1) and the outer ring (3) to form the impeller; characterized in that: The blade (2) has a first guide rib (81) and a second guide rib (82) on its positive or negative pressure surface. The first guide rib (81) is located on the radial outer side of the blade (2), and the second guide rib (82) is located on the radial inner side of the blade (2). Both the first guide rib (81) and the second guide rib (82) are straight plate-type guide ribs. On the positive or negative pressure surface of the blade, the first guide rib (81) and the second guide rib (82) form a gradually expanding flow channel A along the airflow direction. The ends of the first guide rib (81) and the second guide rib (82) away from the positive or negative pressure surface of the blade are inclined towards the flow channel A, forming a flow channel A. The flow channel B, which is close to the positive or negative pressure surface and away from the positive or negative pressure surface, is a gradually narrowing flow channel; the trailing edge of the blade (2) is provided with a serrated structure; the inlet ends of the first guide rib (81) and the second guide rib (82) are both corresponding to the leading edge of the blade (2), and the outlet ends of the first guide rib (81) and the second guide rib (82) are both corresponding to the serrated structure of the trailing edge of the blade (2); the inlet radius of the impeller is R, the distance from the inlet end of the first guide rib (81) to the central axis is R1, and the distance from the inlet end of the second guide rib (82) to the central axis is R2, where R1 > 0.5R and R2 < 0.5R.
2. The impeller with a stability-enhancing and noise-reducing structure as described in claim 1, characterized in that, The first guide rib (81) and the second guide rib (82) have different thicknesses in the radial direction.
3. The impeller with a stability-enhancing and noise-reducing structure as described in claim 2, characterized in that, The radial thickness of the first guide rib (81) is greater than the radial thickness of the second guide rib (82).
4. The impeller with a stability-enhancing and noise-reducing structure as described in claim 1, characterized in that, R1 = (0.6 ~ 0.8) R.
5. The impeller with a stability-enhancing and noise-reducing structure as described in claim 1, characterized in that, R2 = (0.35 ~ 0.45) R.
6. The impeller with a noise reduction and stability enhancement structure as described in claim 1, characterized in that, The width of flow channel A in the inlet direction is L1, and the width in the outlet direction is W1, where 1.5L1 < W1 < 3L1.
7. The impeller with a stability-enhancing and noise-reducing structure as described in claim 6, characterized in that, The width of flow channel B away from the positive or negative pressure surface is L2, and the width close to the positive or negative pressure surface is W2, where 1.2L2 < W2 < 2.5L2.
8. The impeller with a stability-enhancing and noise-reducing structure as described in claim 7, characterized in that, W1 > W2.
9. A fan, characterized in that, The fan includes a motor (4) consisting of a stator (41) and a rotor (42), a collector (5), a flow guide (6), and a controller (7); the flow guide (6) includes a ring rib (61) and a flow guide rib (62), which are arranged in an alternating manner to form a flow guide structure; the fan includes an impeller with a stabilization and noise reduction structure as described in any one of claims 1 to 8.
10. A fan as described in claim 9, characterized in that, The fairing (6) is a one-piece cast structure.
11. A fan as described in claim 9, characterized in that, The outlet end of the collector (5) is inserted into the outer ring (3) of the impeller.
12. A fan as described in claim 11, characterized in that, An auxiliary flow channel is formed between the outer wall of the collector (5) and the inner wall of the outer ring (3) of the impeller.