Impeller with stability-expanding and noise-reducing structure and fan applying same

Abstract

The present application discloses a kind of impeller with stabilizing and noise reduction structure and fan using it, the positive pressure surface or negative pressure surface of blade is provided with first guide rib and second guide rib, first guide rib is located at the radial outer side of blade, second guide rib is located at the radial inner side of blade, first guide rib and second guide rib are straight plate type guide rib;In the positive pressure surface or negative pressure surface of blade, first guide rib and second guide rib are gradually expanding flow channel A formed along the direction of airflow flow;The end of first guide rib and second guide rib away from the positive pressure surface or negative pressure surface of blade is inclined to flow channel A, and forms gradually shrinking flow channel B from the positive pressure surface or negative pressure surface to the positive pressure surface or negative pressure surface away;The trailing edge of blade is provided with sawtooth structure.As the impeller and fan using it are improved, the problems such as poor adaptability, large flow loss, poor stability, high surge, high noise and low efficiency are solved, and the operating performance and operating efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid machinery, in particular to a vane with a stability-expanding and noise-reducing structure, and more particularly to a fan using the same. BACKGROUND

[0002] The fan is usually used for ventilation, dust removal and cooling, and has the characteristics of small volume, simple structure, good ventilation effect, good economy and the like, and is closely related to people's living environment. During the operation of the fan, uneven pressure pulsation is formed, thereby generating aerodynamic noise and vibration, etc. The structure and layout design of the vane blade can improve the dynamic characteristics after stall, can delay the occurrence of stall, and can significantly reduce the wide-band noise of turbulent interference and instability. Therefore, it is necessary to optimize the design of the vane.

[0003] The prior art CN2839671Y discloses a booster axial flow fan, which comprises a vane 1, vane blades 2 and a motor 3. The vane 1 is composed of six circular-arc vane blades 2 and a core barrel hub. The vane blade root 10 is welded to the outside of the core barrel. Two circular-arc booster guide vanes 4 are arranged on the working surface of each vane blade. The guide direction of each booster guide vane is from the leading edge 8 to the trailing edge 9 of the vane blade, and the booster guide vanes 4 are arranged across the vane blade. One of the booster guide vanes 4 is arranged at the middle part of the working surface of the vane blade, and the other booster guide vane 4 is arranged on the side wall of the tip 11 of the vane blade (the end of the working surface of the vane blade). Due to the effect of the booster guide vanes 4, the airflow entering the working surface of the vane blade cannot directly exit the vane blade. Due to the limitation of the circular-arc booster guide vanes 4, more energy can be absorbed from the vane blade and the booster guide vanes, so that higher wind pressure and wind speed can be obtained. Due to the blocking of the booster guide vanes on the edge of the tip of the vane blade, the airflow entering the working surface of the vane blade cannot overflow the vane blade radially, so that the airflow entering the working surface of the vane blade can more fully absorb energy, thereby ensuring higher booster efficiency of the vane.

[0004] However, the above-mentioned vane structure has design limitations, only involves the design of part of the non-universal vane structure, does not essentially change the vane structure, has poor adaptability, large flow loss, poor stability, high surge, high noise and low efficiency. Therefore, in view of these problems, the present application provides a vane with a stability-expanding and noise-reducing structure and a fan using the same to solve the above-mentioned problems to reduce the surge, noise and instability, and thereby improve the working condition performance and efficiency. SUMMARY

[0005] The application aims at providing a blade wheel with a stability-expanding and noise-reducing structure and a fan using the same to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical scheme.

[0007] A blade wheel with a stability-expanding and noise-reducing structure comprises a hub, blades, and an outer ring of the blade wheel. The blades are evenly distributed along a circumference and are installed between the hub and the outer ring of the blade wheel to form the blade wheel. The positive pressure surface or the negative pressure surface of the blade is provided with a first guide rib and a second guide rib. The first guide rib is located at the radial outer side of the blade, and the second guide rib is located at the radial inner side of the blade. Both the first guide rib and the second guide rib are straight plate type guide ribs. On the positive pressure surface or the negative pressure surface of the blade, the first guide rib and the second guide rib form a gradually expanding flow channel A along the direction of airflow. The end of the first guide rib and the end of the second guide rib away from the positive pressure surface or the negative pressure surface of the blade are both inclined to the flow channel A to form a gradually shrinking flow channel B away from the positive pressure surface or the negative pressure surface. The trailing edge of the blade is provided with a sawtooth structure. The inflow end of the first guide rib and the inflow end of the second guide rib correspond to the leading edge of the blade, and the outflow end of the first guide rib and the outflow end of the second guide rib correspond to the sawtooth structure of the trailing edge of the blade. The inlet radius of the blade wheel is R, the distance from the inflow end of the first guide rib to the central axis is R1, and the distance from the inflow end of the second guide rib to the central axis is R2, wherein R1>0.5R and R2<0.5R.

[0008] Further, the thickness of the first guide rib and the second guide rib in the radial direction is different.

[0009] Further, the thickness of the first guide rib in the radial direction is greater than the thickness of the second guide rib in the radial direction.

[0010] Further, R1=(0.6-0.8)R.

[0011] Further, R2=(0.35-0.45)R.

[0012] Further, the width of the flow channel A in the inlet direction is L1, and the width of the flow channel A in the outlet direction is W1, wherein 1.5L1W1<3L1.

[0013] Further, the width of the flow channel B away from the positive pressure surface or the negative pressure surface is L2, and the width of the flow channel B close to the positive pressure surface or the negative pressure surface is W2, wherein 1.2L2W2<2.5L2.

[0014] Further, W1>W2.

[0015] A fan comprises a motor composed of a stator and a rotor, a current collector, a flow guide cover, and a controller. The flow guide cover comprises ring ribs and flow guide ribs, and the ring ribs and the flow guide ribs are arranged alternately to form a flow guide structure. The fan comprises the blade wheel with a stability-expanding and noise-reducing structure.

[0016] Further, the fairing is an integral casting structure.

[0017] Further, the collector outlet end is inserted into the impeller outer ring.

[0018] Further, the auxiliary flow guide channel is formed between the collector outer sidewall and the impeller outer ring inner sidewall.

[0019] The impeller with stability-expanding and noise-reducing structure and the fan using the same, which comprises a hub, blades, and an impeller outer ring, the blades are uniformly distributed along the circumference and are installed between the hub and the impeller outer ring to form the impeller, characterized in that: the positive pressure surface or the negative pressure surface of the blade is provided with a first guide rib and a second guide rib, the first guide rib is located on the radial outer side of the blade, the second guide rib is located on the radial inner side of the blade, and the first guide rib and the second guide rib are both straight plate type guide ribs; on the positive pressure surface or the negative pressure surface of the blade, the first guide rib and the second guide rib form a gradually expanding flow channel A along the airflow direction; the end of the first guide rib and the end of the second guide rib away from the positive pressure surface or the negative pressure surface of the blade are both inclined to the flow channel A, forming a gradually shrinking flow channel B from the positive pressure surface or the negative pressure surface to the end away from the positive pressure surface or the negative pressure surface; the trailing edge of the blade is provided with a sawtooth structure; the inflow end of the first guide rib and the inflow end of the second guide rib both correspond to the leading edge of the blade, and the outflow end of the first guide rib and the outflow end of the second guide rib both correspond to the sawtooth structure of the trailing edge of the blade; the inlet radius of the impeller is R, the distance from the inflow end of the first guide rib to the center axis is R1, and the distance from the inflow end of the second guide rib to the center axis is R2, wherein R1>0.5R and R2<0.5R. Due to the improvement of the impeller and the fan using the same, the problems of poor adaptability, large flow loss, poor stability, high surge, high noise, and low efficiency are solved, and the working condition performance and the operation efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an axial sectional structure schematic diagram of the fan;

[0021] Figure 2 It is a top view of the impeller structure;

[0022] Figure 3 It is a sectional structure schematic diagram of the flow channel A;

[0023] Figure 4 It is a sectional structure schematic diagram of the 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] like Figures 1-4 As shown, 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 first guide rib 81 and the second guide rib 82 form a gradually expanding flow channel A along the airflow direction. The first guide rib 81 and the second guide rib 82 form a gradually expanding flow channel. The ends of the two guide ribs 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 the aerodynamic efficiency of the air. The fluid enters the impeller through the variable-diameter flow passage, and the geometric characteristics of the impeller blades cause the distribution of the relative velocity of the fluid, which affects the distribution of the flow state and ultimately affects the loss and efficiency caused by vibration noise. The impeller in the application is different from the conventional impeller in the prior art. The applicant found that the advantages and disadvantages of the structure design of the impeller blade directly affect the intensity of the surge noise and the like. In view of the above problems, the applicant optimizes the design of the impeller blade structure, adopts the first guide rib 81 and the second guide rib 82 formed by combining the guide rib with the gradually expanding or gradually contracting flow path structure, and the above structure of the guide rib accelerates the movement of the fluid, reduces the residence time of the fluid in the blade, and reduces the influence of the occurrence of the surge noise and the like. In addition, the structure design of the straight plate type guide rib also makes the fluid more stable on the flow path, reduces the possibility of concentrated occurrence of the surge noise and the like at a certain place, and reduces the influence of the occurrence of the surge noise and the like. In addition, the sawtooth structure of the trailing edge is more conducive to reducing vibration and maintaining the stability of the fan.

[0029] Further, the thickness of the first guide rib 81 and the second guide rib 82 in the radial direction is different.

[0030] Further, the thickness of the first guide rib 81 in the radial direction is greater than the thickness of the second guide rib 82 in the radial direction.

[0031] Considering that the surge noise on the outer side of the radial direction is relatively larger, in order to reduce the adverse effects of the outer side, the applicant found that the thickness of the guide rib in the radial direction can also reduce the possibility of the occurrence of the surge noise and the like at a certain place to a certain extent.

[0032] Further, R1=(0.6-0.8)R.

[0033] Further, R2=(0.35-0.45)R.

[0034] Further, the width of the flow passage A in the inlet direction is L1, and the width in the outlet direction is W1, wherein 1.5L1

[0035] Further, the width of the flow passage B away from the positive pressure surface or the negative pressure surface is L2, and the width close to the positive pressure surface or the negative pressure surface is W2, wherein 1.2L2

[0036] Further, W1>W2.

[0037] The blade type and the flow path structure play a crucial role in improving the flow state, which can assist in reducing vibration and noise and stabilizing the fluid flow state.

[0038] A fan, comprising a motor 4 composed of a stator 41 and a rotor 42, a current collector 5, a flow guide cover 6, a controller 7; the flow guide cover 6 comprises ring ribs 61 and flow guide ribs 62, which are arranged alternately to form a flow guide structure; the fan comprises the impeller with the stability-expanding and noise-reducing structure.

[0039] Further, the flow guide cover 6 is an integrally cast structure.

[0040] Further, the outlet end of the current collector 5 is inserted into the outer ring 3 of the impeller.

[0041] Further, an auxiliary flow guide channel is formed between the outer sidewall of the current collector 5 and the inner sidewall of the outer ring 3 of the impeller.

[0042] The flow guide cover 6 composed of the ring ribs 61 and the flow guide ribs 62 plays a significant flow guide and efficiency increasing role, greatly reduces noise, and increases stability.

[0043] The application discloses an impeller with a stability-expanding and noise-reducing structure and a fan applying the same, which comprises a hub, blades and an outer ring of the impeller; the blades are uniformly distributed along a circumference and are 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 arranged on a positive pressure surface or a negative pressure surface of the blade, the first guide rib is located at a radial outer side of the blade, the second guide rib is located at a radial inner side of the blade, and the first guide rib and the second guide rib are both straight plate type guide ribs; on the positive pressure surface or the negative pressure surface of the blade, the first guide rib and the second guide rib form a gradually expanding flow channel A along a gas flow direction; one end of the first guide rib and the second guide rib, which is away from the positive pressure surface or the negative pressure surface, is inclined to the flow channel A, forming a gradually shrinking flow channel B from the positive pressure surface or the negative pressure surface to the flow channel A; a sawtooth structure is arranged on a trailing edge of the blade; the inflow end of the first guide rib and the second guide rib corresponds to a leading edge of the blade, and the outflow end of the first guide rib and the second guide rib corresponds to the sawtooth structure of the trailing edge of the blade; the inlet radius of the impeller is R, the distance from the inflow end of the first guide rib to a central axis is R1, and the distance from the inflow end of the second guide rib to the central axis is R2, wherein R1>0.5R and R2<0.5R. Due to the improvement of the impeller and the fan applying the same, the problems of poor adaptability, great flow loss, poor stability, high surge, high noise and low efficiency are solved, and the working condition performance and operation efficiency are improved.

Claims

1. A kind of impeller with stabilizing noise reduction structure, it includes hub (1), blade (2), impeller outer ring (3);Blade (2) is evenly distributed along the circumference and is installed between hub (1) and impeller outer ring (3) to form impeller;Its characterized in that: The positive pressure surface or the negative pressure surface of the blade (2) is provided with a first guide rib (81) and a second guide rib (82), the first guide rib (81) is located on the radial outer side of the blade (2), the second guide rib (82) is located on the radial inner side of the blade (2), and the first guide rib (81) and the second guide rib (82) are both straight plate type guide ribs; on the positive pressure surface or the 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 direction of airflow flow; the end of the first guide rib (81) and the second guide rib (82) away from the positive pressure surface or the negative pressure surface is inclined to the flow channel A, forming a gradually shrinking flow channel B away from the positive pressure surface or the negative pressure surface; the trailing edge of the blade (2) is provided with a sawtooth structure; the inflow end of the first guide rib (81) and the second guide rib (82) corresponds to the leading edge of the blade (2), and the outflow end of the first guide rib (81) and the second guide rib (82) corresponds to the sawtooth structure of the trailing edge of the blade (2); the inlet radius of the impeller is R, the distance from the inflow end of the first guide rib (81) to the center axis is R1, and the distance from the inflow end of the second guide rib (82) to the center axis is R2, wherein R1>0.5R, and R2<0.5R; the thickness of the first guide rib (81) and the second guide rib (82) in the radial direction is different; the width of the flow channel A in the inlet direction is L1, and the width in the outlet direction is W1, wherein 1.5L1<W1<3L1; the width of the flow channel B away from the positive pressure surface or the negative pressure surface is L2, and the width close to the positive pressure surface or the negative pressure surface is W2, wherein 1.2L2<W2<2.5L2.

2. The impeller with stability-expanding and noise-reducing structure according to claim 1, characterized in that, The thickness of the first guide rib (81) in the radial direction is greater than the thickness of the second guide rib (82) in the radial direction.

3. The impeller with stabilizing and noise reducing structure according to claim 1, characterized in that, R1=(0.6-0.8)R.

4. The impeller with stabilizing and noise reducing structure according to claim 1, wherein, R2=(0.35-0.45)R.

5. The impeller with stabilizing and noise reducing structure according to claim 1, wherein, W1>W2.

6. A fan, characterized by The fan comprises a motor (4) composed of a stator (41) and a rotor (42), a current collector (5), a flow guide cover (6), and a controller (7); the flow guide cover (6) comprises ring ribs (61) and flow guide ribs (62), and the ring ribs (61) and the flow guide ribs (62) are arranged alternately to form a flow guide structure; the fan comprises the impeller with the stability-expanding and noise-reducing structure according to any one of claims 1 to 5.

7. A fan as claimed in claim 6, wherein The flow guide cover (6) is an integral casting structure.

8. A fan as claimed in claim 6, wherein The outlet end of the current collector (5) is inserted into the outer ring (3) of the impeller.

9. A fan as claimed in claim 8, wherein An auxiliary flow guide channel is formed between the outer side wall of the current collector (5) and the inner side wall of the outer ring (3) of the impeller. The flow guide cover (6) is an integral casting structure.

Images