Bionic blade with surface wave-shaped structure, impeller and fan

Abstract

The invention discloses a bionic blade with a surface wavy structure, an impeller and a fan. The blade is continuously provided with the wavy structure in the chord length direction. The wave structure comprises a first wave structure, a gentle structure and a second wave structure which are continuously and sequentially arranged in the chord length arrangement direction. According to the closed axial flow impeller, the wave-shaped bionic design is adopted on the surface of the blade, the wave-shaped position is mainly concentrated on the position from 50% of the blade height to the blade top of the blade, and the purpose of the wave-shaped bionic design is mainly used for reducing noise from the top of the blade to the position from the top of the blade to the 50% of the blade height. When the wind wheel works, the part with higher noise pressure intensity is mainly concentrated at the position from more than 50% of the blade height to the blade top, and the noise pressure intensity near the blade top is relatively highest; the blades at the positions are designed in a wavy mode, the airflow energy dissipation and gathering area can be effectively improved, and therefore noise is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fan, and particularly relates to a bionic blade with a surface wave structure, an impeller and a fan. BACKGROUND

[0002] The fan is a device for conveying gas, which comprises a wind wheel, a wind guide ring, a support and a motor, wherein a plurality of blades are arranged on the wind wheel, and the number of blades is adjusted according to actual use, but there is a certain noise in the use of the fan. In order to solve the problem of noise, the blades with a wave structure are arranged in the prior art to reduce noise, but the noise reduction effect of this arrangement is still not ideal. In order to solve the above technical problems, it is necessary to develop a bionic blade with a surface wave structure, an impeller and a fan. SUMMARY

[0003] The present application aims to provide a bionic blade with a surface wave structure, an impeller and a fan to solve the above technical problems. The present application is directed to a closed axial impeller, and a wave type bionic design is adopted on the surface of the blade. The wave type position is mainly concentrated in the position from 50% of the blade height (the blade height is the distance between the blade root and the blade top) to the blade top, and the purpose is mainly to reduce the noise in the position from the blade top to 50% of the blade height. When the wind wheel is working, the position with high noise sound pressure intensity is mainly concentrated in the position from 50% of the blade height to the blade top, and the noise sound pressure intensity is relatively highest near the blade top. The wave type design of the blade in this position can effectively improve the airflow energy dissipation and aggregation area, thereby reducing the noise.

[0004] In order to achieve the above application purposes, the technical scheme adopted by the present application is as follows:

[0005] A bionic blade with a surface wave structure, wherein the wave structure is continuously arranged along the chord length direction.

[0006] The wave structure comprises a first wave structure, a flat structure and a second wave structure which are sequentially arranged along the chord length arrangement direction.

[0007] Preferably, the wave peak amplitude gradually decreases from the first wave structure to the flat structure along the chord length arrangement direction.

[0008] Preferably, the wave peak amplitude gradually increases from the flat structure to the second wave structure along the chord length arrangement direction.

[0009] Preferably, the flat structure is arranged at 35% to 45% of the chord length along the direction from the blade leading edge to the trailing edge. Specifically, the flat structure is arranged at 40% of the chord length along the direction from the blade leading edge to the trailing edge.

[0010] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0011] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0012] Preferably, the second wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0013] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0014] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0015] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0016] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0017] Preferably, the first wave structure is provided with a wave peak amplitude on the pressure surface of the blade greater than that on the suction surface of the blade.

[0018] A kind of impeller, the bionic blade of described is equipped.The present impeller scheme uses cover ring 8 and the outer circle of blade 9 connection, form closed structure, cover ring 8 and air guide ring 2 are installed by gap cooperation, impeller hub 3 uses the structure of gradually increasing in the direction of blade pressure surface to blade suction surface section, this structure makes the meridian flow passage of impeller have mixed flow structure characteristics, make the pressure coefficient of impeller be relatively higher (relative axial flow), realize the high static pressure PQ characteristics of impeller.

[0019] A kind of fan, the impeller of described is equipped.

[0020] The present application has obtained the beneficial technical effect:

[0021] The present application is directed to a closed type axial flow impeller, a wave type bionic design is adopted on the surface of the blade, the wave type position is mainly concentrated in the position from 50% blade height to the top of the blade, and the purpose is mainly to reduce the noise in the position from the top of the blade to 50% blade height. When the fan works, the position with high noise sound pressure intensity is mainly concentrated in the position from 50% blade height to the top of the blade, and the noise sound pressure intensity is relatively highest near the top of the blade; the wave type design is adopted for the blade in the position, so that the airflow energy dissipation and gathering area can be effectively improved, and the noise can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 shows one of the assembly structure schematic diagrams of the fan;

[0023] Figure 2 Fig. 2 shows another of the assembly structure schematic diagrams of the fan;

[0024] Figure 3 Fig. 3 shows one of the structure schematic diagrams of the blade;

[0025] Figure 4 Fig. 4 shows another of the structure schematic diagrams of the blade;

[0026] Figure 5 Fig. 5 shows the cross-sectional schematic diagram of S1 to S5 of the fan; Figure 4

[0027] Figure 6 Fig. 6 shows the schematic diagram of the wave crest H and the wave length λ;

[0028] Figure 7 Fig. 7 shows the cross-sectional structure schematic diagram of the fan. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0030] The technical solutions of the present application will be described in detail below with specific embodiments.

[0031] Referring to Figures 1 to 7 Fig. 1, a bionic blade with a surface wave type structure in an embodiment of the present application is shown, the wave structure is continuously arranged along the chord length direction of the blade;

[0032] ​The wave structure includes a first wave structure, a flat structure and a second wave structure which are arranged continuously in sequence along the chord length setting direction, wherein the first wave structure corresponds to section S1 close to the leading edge of the blade; the first wave structure corresponds to section S2 close to the flat structure; the second wave structure corresponds to section S3 close to the flat structure; the middle position of the second wave structure corresponds to section S4; the second wave structure corresponds to section S5 close to the trailing edge of the blade, wherein the flat structure is correspondingly arranged between section S2 and section S3.

[0033] In one embodiment, along the chord length setting direction (i.e., from the leading edge to the trailing edge of the blade), the peak amplitude of the wave shape from the first wave structure to the flat structure setting gradually decreases. Along the chord length setting direction, the peak amplitude of the wave shape from the flat structure to the second wave structure setting gradually increases. The flat structure is set at 40% of the chord length. Specifically, along the leading edge to the trailing edge of the blade, the flat structure is set at 40% of the chord length. A cross-section is made along the direction from the root to the top of the blade, and sections S1, S2, S3, S4, and S5 are obtained according to different chord length positions. From the different slice sections from the inlet (S1 section) to the outlet (S5 section), it can be seen that the peak amplitude of the wave shape on the inlet section S1 is relatively large, and then gradually decreases. The peak is the lowest when it is approximately close to the 40% chord length position. From 40% chord length to the trailing edge, the peak amplitude gradually increases. The relationship between the maximum wave peak height and the chord length is: H / d=0.04, where H is the wave peak and d is the maximum chord length. The relationship between the minimum wave peak height and the chord length is H / d=0.001, where H is the wave peak and d is the maximum chord length. The wavelength variation range of the wave structure satisfies the following relationship: λ / d=0.05~0.2, where λ is the wavelength and d is the maximum chord length. This changing wave peak and trough structure causes the airflow to generate noise of different wavelengths when passing through these blade wall positions, thereby avoiding the superposition effect of the same wavelength and further reducing the noise value.

[0034] In one embodiment, the peak amplitude of the first wave structure set on the pressure side of the blade is greater than the peak amplitude of the first wave structure set on the suction side of the blade. Near the blade inlet position, the wave structure on the S1 cross-sectional slice is characterized by: the pressure side peak is relatively large, and the suction side peak is relatively small. Specifically, at each corresponding position, the pressure side and suction side peak ratio range is Hs / Hp=0.2~0.9, where Hs is the suction side peak, Hp is the pressure side peak, and the pressure side and suction side wavelength ratio range is λs / λp=0.5~0.9, where λs is the suction side wavelength, and λp is the pressure side wavelength. This structure actually increases the inlet airflow angle of the wave crest spanwise section (compared with no waves), which is beneficial to further increase the flow rate when the airflow enters the blade flow channel. This structure makes the incoming airflow flow smoother and can effectively reduce the inlet noise when the gas enters the impeller.

[0035] In one of the embodiments, near the trailing edge of the blade, the wave structure features on the S5 cross-section slice are as follows: the pressure surface and the suction surface wave peaks are relatively obvious, and the maximum wave peak and the chord length are in the range of H / d=0.02~0.04 (wave peak / chord length), which improves the matching between the airflow and the trailing edge wave structure and is beneficial to reduce the aerodynamic noise near the trailing edge in the flow passage.

[0036] In one of the embodiments, the first wave structure and the second wave structure are provided with a plurality of wave peaks on the pressure surface and the suction surface of the blade.

[0037] In one of the embodiments, the wave structure is arranged in the range from the blade top to 50% of the blade height. For the closed axial flow impeller, the wave type bionic design is adopted on the blade surface, and the wave type position is mainly concentrated in the range from 50% of the blade height to the blade top, and the purpose is mainly to reduce the noise in the range from the blade top to 50% of the blade height. (1) When the fan works, the positions with high noise sound pressure intensity are mainly concentrated in the range from 50% of the blade height to the blade top, and the noise sound pressure intensity near the blade top is relatively highest; (2) The wave type design is adopted for the blade at the position, which can effectively improve the airflow energy dissipation and aggregation area, thereby reducing the noise.

[0038] In one of the embodiments, the first sawtooth type structure 11 is arranged at the leading edge of the blade, and the ratio of the wave peak to the wave length is in the range of H / λ=0.1~5. The coupling design with the inlet wave surface, i.e., the smooth transition with the inlet wave surface, can further reduce the inlet noise.

[0039] In one of the embodiments, the second sawtooth type structure 12 is arranged at the trailing edge of the blade, and the ratio of the wave peak to the wave length is in the range of H / λ=0.1~5. The coupling design with the outlet surface wave, i.e., the smooth transition with the outlet wave surface, can further reduce the outlet noise.

[0040] In one of the embodiments, the wave peak arranged between the first wave structure and the smooth structure and the wave peak arranged between the smooth structure and the second wave structure are staggered.

[0041] The application further provides an impeller assembled with the bionic blade as described above. The impeller scheme adopts the cover ring 8 connected with the outer circle of the blade 9 to form a closed structure, the cover ring 8 is installed through the gap cooperation with the wind guide ring 2, and the impeller hub 3 adopts the structure that the cross section in the direction from the blade pressure surface to the blade suction surface is gradually increased in the taper type, which makes the impeller meridian flow passage have the mixed flow structure characteristics, makes the pressure coefficient of the impeller be relatively high (relative to the axial flow), and realizes the high static pressure PQ characteristics of the impeller.

[0042] The present invention also provides a fan equipped with any of the above-described impellers. It primarily comprises a rotor 1, an air guide ring 2, a bracket 6, and a motor 4. The rotor primarily includes a hub, blades, and a cover ring. The rotating portion of the motor is bolted to the rotor, while the bracket is bolted to the motor base and air guide ring. The air guide ring is secured to the user's mounting plate.

[0043] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

[0045] The above is a detailed description of the embodiments of a bionic blade, an impeller and a fan with a surface wavy structure provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A bionic blade with a wavy surface structure, characterized in that: The blades are continuously provided with a wave structure along the chord length direction; The wave structure includes a first wave structure, a gentle structure, and a second wave structure that are sequentially arranged along the chord length setting direction; The peak amplitude of the wave from the first wave structure to the flat structure is gradually reduced; The wave crest amplitude from the gentle structure to the second wave structure increases gradually along the chord length setting direction.

2. The bionic blade according to claim 1, characterized in that: Along the chord length setting direction, the wave crests set between the first wave structure and the flat structure and the wave crests set between the flat structure and the second wave structure are staggered with each other.

3. The bionic blade according to claim 1, characterized in that: Along the direction from the leading edge to the trailing edge of the blade, the flat structure is arranged at 35% to 45% of the chord length.

4. The bionic blade according to claim 2, characterized in that: The relationship between the maximum wave crest height and the chord length is: H / d = 0.04 (H is the wave crest, d is the maximum chord length); the minimum wave crest height is H / d = 0.001 (H is the wave crest, d is the maximum chord length), and the wavelength variation range of the wave structure satisfies the following relationship: λ / d = 0.05~0.2 (λ is the wavelength, d is the maximum chord length).

5. The bionic blade according to claim 2, characterized in that: The peak amplitude of the first wave structure on the pressure side of the blade is greater than the peak amplitude of the first wave structure on the suction side of the blade; The relationship between the maximum wave crest and the chord length on the pressure side and the suction side of the second wave structure is in the range of H / d=0.02-0.04, where H is the wave crest and d is the maximum chord length.

6. The bionic blade according to claim 1, characterized in that: The crest height of the flat structure is H / d=0.001, where H is the crest and d is the maximum chord length.

7. The bionic blade according to claim 1, characterized in that: The wave structure is arranged in the range from the top of the blade to a position of 50% to 60% of the blade height.

8. The bionic blade according to claim 1, characterized in that: The leading edge of the blade is provided with a first sawtooth structure, and the ratio of its wave crest to wavelength is in the range of: H / λ=0.1-5; The trailing edge of the blade is provided with a second sawtooth structure, and the ratio of the wave crest to the wavelength thereof is in the range of H / λ=0.1-5.

9. An impeller, characterized in that: Assemble the bionic blade according to any one of claims 1 to 8.

10. A fan, characterized in that: Assemble the impeller according to claim 9.

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