CN111059076A - Double-blade cluster blade structure, axial flow fan and air conditioner - Google Patents

Double-blade cluster blade structure, axial flow fan and air conditioner Download PDF

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Publication number
CN111059076A
CN111059076A CN201911405113.9A CN201911405113A CN111059076A CN 111059076 A CN111059076 A CN 111059076A CN 201911405113 A CN201911405113 A CN 201911405113A CN 111059076 A CN111059076 A CN 111059076A
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blade
clustering
fan
dual
edge
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CN201911405113.9A
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Inventor
陈小平
林勇进
陈伟健
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Foshan Viomi Electrical Technology Co Ltd
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Foshan Viomi Electrical Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/327—Rotors specially for elastic fluids for axial flow pumps for axial flow fans with non identical blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a double-fan-blade clustering fan blade structure which comprises a fixed framework, wherein at least one group of clustering fan blades are arranged on the fixed framework, each clustering fan blade comprises a first fan blade and a second fan blade, the blade root of the first fan blade is connected with the fixed framework, the blade root of the second fan blade is connected with the fixed framework, and the overall structure of the second fan blade is in a step shape. The cluster fan blade structure has the advantages of stable air supply, large air supply amount and high overall stability. The invention also discloses an axial flow fan with the cluster blade structure and an air conditioner with the axial flow fan.

Description

Double-blade cluster blade structure, axial flow fan and air conditioner
Technical Field
The invention belongs to the technical field of fan heat dissipation, and particularly relates to a double-blade cluster blade structure, an axial flow fan and an air conditioner.
Background
The fan is widely applied to electronic components such as computers, civil electric appliances such as hair dryers and the like, and industries and fields such as chemical engineering, machinery and the like. The main performances of the fan include air supply performance and acoustic performance, wherein the air supply performance is taken as the most basic performance of the fan, and the larger the air supply amount is, the better the heat dissipation effect which can be achieved by the fan is.
In the existing fans, a common single-layer smooth fan blade is mostly adopted, and under the condition that the working space of the fan blade is not changed, in order to improve the air supply performance of the fan blade and further improve the overall performance (such as air output) of the fan, the improvement is mainly realized by increasing the number of the fan blades, however, the performance of the fan blade is improved by increasing the number of the fan blades, the size of the fan blade needs to be reduced, so that the performance of a single fan blade can be reduced, and the improvement effect is not obvious. The existing design of the common single-layer smooth fan blade is difficult to meet the requirement of people on the high performance of the fan.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a double-blade clustering blade structure which has the advantages of stable air supply, large air supply amount and high overall stability.
Another object of the present invention is to provide an axial flow fan;
another object of the present invention is to provide an air conditioner.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the double-fan-blade clustering fan blade structure comprises a fixed framework, wherein at least one group of clustering fan blades are arranged on the fixed framework, each clustering fan blade comprises a first fan blade and a second fan blade, the blade root of the first fan blade is connected with the fixed framework, the blade root of the second fan blade is connected with the fixed framework, and the whole structure of the second fan blade is in a step shape.
Further, the ladder shape of second blade divide into inner leaf, connecting leaf and outer leaf, the inner leaf the connecting leaf with the outer leaf connects gradually and forms the ladder shape.
Further, the windward side of the outer blade is closer to the windward point than the windward side of the inner blade.
The fan comprises a fixed framework, and is characterized by further comprising a noise reduction structure, wherein the edge of one end, connected with the fixed framework, of the first fan blade and/or the edge of one end, connected with the fixed framework, of the second fan blade is provided with the noise reduction structure.
Furthermore, a noise reduction structure is arranged at the junction of the front edge and the outer edge of the first fan blade and/or the junction of the rear edge and the outer edge of the first fan blade.
Furthermore, a noise reduction structure is arranged at the junction of the front edge and the outer edge of the second fan blade and/or the junction of the rear edge and the outer edge of the second fan blade.
Furthermore, noise reduction structures are arranged on the upper edge and the lower edge of the fixed framework.
Further, the edge of the joint of the inner blade and the connecting blade, and/or the edge of the joint of the outer blade and the connecting blade is provided with a noise reduction structure.
Furthermore, the noise reduction structure is set to be any one or combination of any multiple structures of a sawtooth structure, a wave-shaped structure, a V-shaped structure, a W-shaped structure and a semicircular structure.
Further, the noise reducing structure includes any two different shape structures.
Furthermore, the edge of the noise reduction structure is also provided with a secondary noise reduction structure.
Furthermore, the first fan blade and the second fan blade are distributed at intervals.
Further, the clearance between the first fan blade and the second fan blade in height is not less than 10 mm.
Further, the inner installation angle of the first fan blade is set to be 15-75 degrees, the outer installation angle is set to be 10-70 degrees, and/or the inner installation angle of the second fan blade is set to be 15-75 degrees, and the outer installation angle is set to be 10-70 degrees.
Furthermore, a groove is formed in one side face of the fixing framework, and a plurality of reinforcing ribs are uniformly arranged in the groove.
Further, the structure of the fixing framework is arranged to be cylindrical or truncated cone-shaped.
Further, the cluster fan blade is provided with a plurality of fan blade real-time values, wherein the fan blade real-time value calculation formula is as follows:
Figure BDA0002348418540000021
(i and n are positive integers, i is more than or equal to 1, and n is more than i), wherein S isDThe blade real number value L of the clustered blades under the diameter DiIs the chord length of the blade i,
Figure BDA0002348418540000022
is the sum of the chord lengths of the blades of each blade at the same diameter D, and n is the number of blades present at the same diameter D.
Furthermore, the cluster fan blade is provided with a plurality of diameters D, the diameter D ranges from 20mm to 1.5m, and the fan blade solidity value ranges from 0.05 to 0.95.
An axial fan comprises the cluster blade structure.
An air conditioner comprises the axial flow fan.
Compared with the prior art, the invention has the beneficial effects that:
according to the double-blade clustering blade structure, the clustering blades are arranged on the fixed framework, and the mutual combination of the first blades and the second blades can obtain the solidity of a plurality of blades, so that the solidity can be limited to the outermost periphery of a single blade to do effective work, and the wind blown by the clustering blade combination has larger air output, more uniform air output, higher efficiency and obviously improved air output compared with the traditional blades. And through designing the overall structure of second fan blade into the echelonment, its itself just can regard as a cluster fan blade structure alone, and through the cooperation with between the first fan blade, can improve the air supply volume more effectively and can also guarantee the holistic stability of fan blade structure to guarantee the stability of air supply.
In addition, this fan blade structure still is provided with the structure of making an uproar of falling, all is provided with the structure of making an uproar of falling through the edge at all junctions, simultaneously, also all is provided with the structure of making an uproar of falling on the upper and lower edge of fixed framework, can reduce the production of noise effectively.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Wherein:
FIG. 1 is a schematic structural diagram of a clustering fan blade structure with a reinforcing frame according to the present invention;
FIG. 2 is a schematic structural diagram of a clustering fan blade structure with a reinforcing frame provided with a noise reduction structure according to the present invention;
FIG. 3 is a schematic structural view of a noise reducing structure according to the present invention;
FIG. 4 is a schematic view of the connection and junction distribution of the present invention;
FIG. 5 is a schematic structural view of a single fan blade according to the present invention;
FIG. 6 is a schematic view of the shape of the noise reducing structures and secondary noise reducing structures of the present invention;
FIG. 7 is a schematic view of the structure of the intersection according to the present invention;
in the figure:
1-a fixed architecture; 11-reinforcing ribs; 2-a first fan blade; 3-a second fan blade; 31-inner leaf; 32-connecting leaf; 33-outer leaf; 4-noise reduction structure; 41-time noise reduction structure; 5-junction; 6-junction; b1 — trailing edge; b2-outer edge; b3 — leading edge; b4-inner edge; c-junction point; h-geometric center.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and the described embodiments are merely a subset of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1, the double-blade cluster blade structure provided by the present invention includes a fixed framework 1, at least one group of cluster blades is disposed on the fixed framework 1, each cluster blade includes a first blade 2 and a second blade 3, the blade root of the first blade 2 is connected to the fixed framework 1, the blade root of the second blade 3 is connected to the fixed framework 1, and the overall structure of the second blade 3 is stepped. The second blade is divided into an inner blade 31, a connecting blade 32 and an outer blade 33 in a step shape, and the inner blade 31, the connecting blade 32 and the outer blade 33 are sequentially connected to form the step shape. The windward side of the outer blade 33 is closer to the windward point than the windward side of the inner blade 31, so that the outer blade 33 arranged on the outer layer can be contacted with the air flow firstly, and the air supply amount and the air supply stability are ensured. The cluster fan blade structure is arranged on the fixed framework 1, and a plurality of fan blade degrees can be obtained, so that the cluster fan blade structure can be limited to the outermost periphery of a single fan blade to do effective work, and the wind blown out by the cluster fan blade structure is more uniform and has higher efficiency compared with the traditional fan blade.
The first fan blade 2 and the second fan blade 3 are arranged at intervals, so that the first fan blade 2 and the second fan blade 3 can achieve high coordination when rotating, the stability of the fan blades during rotation is guaranteed, the stability of air supply is guaranteed, and the air supply quantity can be further improved. The second fan blade 3 is arranged on the reinforcing frame, so that the material consumption of the second fan blade 3 can be reduced, the structural design is simple, the process difficulty is small, the improvement of the production efficiency can be facilitated, and the production cost is reduced. The distance between the outermost edge of the first fan blade 2 and the fixed framework 1 is greater than or equal to the distance between the outermost edge of the second fan blade 3 and the fixed framework 1, so that the first fan blade 2 can protect the second fan blade 3 to a certain extent, the impact and pressure of airflow on the second fan blade 3 are reduced, the condition of turbulent flow generated when the airflow flows through the stepped second fan blade 3 is reduced, and the overall stability of the clustered fan blade structure is improved.
Be provided with the recess on fixed framework 1's a side, evenly be provided with a plurality of strengthening ribs 11 in the recess, the stability when fixed framework 1 rotates can be guaranteed to strengthening rib 11, and stability when further increasing cluster fan blade structure rotates reduces the vibrations that produce when clustering fan blade rotates to it is smooth and easy to guarantee that the air current flows, improves air supply stability. The structure of the fixed framework 1 is cylindrical or circular truncated cone-shaped, and the design of the cylindrical or circular truncated cone is adopted, so that the impact of airflow on the surface of the fixed framework 1 can be reduced, the generation of turbulent flow or large eddy of the airflow is reduced, and the noise is reduced. In addition, the fixing frame 1 is arranged in a circular truncated cone shape, that is, the surface of the fixing frame 1 is inclined, and an appropriate inclination angle is further arranged according to the flow direction of the air flow, so that the impact of the air flow on the surface of the fixing frame 1 can be further reduced, the condition of generating turbulent flow or large eddy of the air flow can be further reduced, and the noise can be further reduced.
In the design of the fan blade, the angle of a straight line formed by connecting two end points of the crossed line of the fan blade and the fixed framework 1 relative to the central axis of the fixed framework 1 is called an inner installation angle, the angle of a straight line formed by connecting two end points of the interface with the largest width of the fan blade relative to the central axis of the fixed framework 1 is called an outer installation angle, in the design of the fan blade structure, the inner installation angle of the first fan blade 2 is set to be 15-75 degrees, the outer installation angle is set to be 10-70 degrees, and/or the inner installation angle of the second fan blade 3 is set to be 15-75 degrees, and the outer installation angle is set to be. By adopting the design and matching of the first fan blade 2 and the second fan blade 3 with the same or different angles within the specific angle adjusting range, the diffusion parameters of the first fan blade 2 and the second fan blade 3 can be optimized, thereby improving the stability and the air output of the air supply of the fan. Moreover, the gap between the first fan blade 2 and the second fan blade 3 in height is set to be not less than 10mm, so that the airflow on the first fan blade 2 and the airflow on the second fan blade 3 have a hierarchical sense, and the two airflows supplement each other, so that the wind blown out by the clustering fan blade structure is continuous, and the air supply stability and the air supply quantity of the fan are effectively improved.
In the design of the cluster fan blade, the cluster fan blade structure is provided with a plurality of fan blade real-time values, wherein the calculation formula of the fan blade real-time values is as follows:
Figure BDA0002348418540000051
(i and n are positive integers, i is more than or equal to 1, and n is more than i), wherein S isDIs the blade real value L of the cluster blade structure under the diameter DiIs the chord length of the blade i,
Figure BDA0002348418540000052
is the sum of the chord lengths of the blades of each blade at the same diameter D, and n is the number of blades present at the same diameter D. In some specific embodiments, the diameter D may range from 20mm to 1.5m, and the fan blade solidity value may range from 0.05 to 0.95.
In this embodiment, the cluster blade structure has a plurality of blade solidity values, which means that each blade with different diameters can perform effective work on the outermost periphery of the diameter, but is not limited to the outermost periphery of a single blade with one diameter, so that the wind blown out by the cluster blade structure is more uniform and has higher efficiency than the conventional blades.
As shown in fig. 2 to 4, the clustering blade structure is further provided with a noise reduction structure, the noise reduction structure 4 is arranged on an edge of a connection end of the first blade 2 and the fixing structure 1, and/or an edge of a connection end of the clustering blade and the fixing structure 1, and/or an edge of a connection end of the inner blade 31 and the connection blade 32, and/or an edge of a connection end of the outer blade 33 and the connection blade 32, and the connection position is a connection position 6 shown in fig. 4. According to research, the above-mentioned junction 6 is the most unstable area of the flow field during the operation of the fan blade, because the airflow has significant interaction with the geometric surface or edge of the fan blade, and forms an unstable boundary layer, especially at the junction 6 farther from the air inlet surface or in the area with unsmooth transition. The unstable boundary layer strengthens the development of small-scale turbulence, and the energy of the flow field is dissipated and converted into noise energy through a small-scale turbulence mechanism.
In addition, during the operation of the fan blade, the airflow field at each junction 5 on the fan blade is also an extremely unstable region, as shown in fig. 5, the transition section of each adjacent edge on the fan blade is the junction 5, and these edges include a leading edge B3, a trailing edge B1, an outer edge B2, and an inner edge B4. Therefore, each junction 5 on the first fan blade 2 and the second fan blade 3 can also be provided with a noise reduction structure 4, so that the noise can be further reduced. In this embodiment, all junctions 6 and juncture 5 of this cluster fan blade structure all can be provided with and fall the structure 4 of making an uproar, moreover, also can be provided with on the upper and lower edge of fixed frame 1 and fall the structure 4 of making an uproar, can also realize combing the air current of the upper and lower edge of fixed structure of flowing through to further realize effectively falling the effect of making an uproar.
As shown in fig. 6, the noise reduction structure 4 is configured as a zigzag structure and/or a wave-shaped structure, and may also be any one or any combination of structures with shapes like zigzag and wave-shaped structures, such as V-shaped, W-shaped, semicircular, and multi-circular structures. The shape structure can cut and comb large eddy generated when the wind flows out of the connecting part 6 to form small eddy, so that the smooth transition of the wind flow out of the connecting part 6 is ensured, the energy of the flow field is reduced and dissipated and converted into noise energy, and the noise caused by high-speed rotation of the fan blades is reduced. The noise reduction structure 4 may further include a secondary noise reduction structure 41, the shape and structure of the secondary noise reduction structure 41 is the same as those of the noise reduction structure 4, and may be any one or a combination of any plural structures of a zigzag structure, a wave structure, a V-shaped structure, a W-shaped structure, and a semicircular structure, or may be a shape and structure similar to the above structure, which can cut and comb the airflow vortex. The secondary noise reduction structure 41 is arranged on the edge of the primary noise reduction structure 4, and can further cut and comb the airflow vortex, so that the noise is further reduced.
In this embodiment, the noise reduction structure 4 is formed by combining any two different shape structures, for example, at the boundary 5 between the blade leading edge B3 and the outer edge B2, the zigzag noise reduction structure 4 is used at the side close to the leading edge B3, and the wavy noise reduction structure 4 is used at the side close to the outer edge B2, so that the two different shape structures can supplement each other, the phenomenon that the airflow generated after the cutting and combing of the single shape structure is gathered again to form a new vortex is avoided, the formation of the vortex can be further reduced, and the effect of further reducing the noise is realized.
As shown in fig. 7, in particular, a boundary point C is disposed on the boundary 6, the boundary point C is used as a dividing point of the boundary 6, and two different noise reduction structures 5 are disposed on the two boundary points; as a preferred arrangement, the intersection point C is the point on the intersection 6 furthest away from the geometric centre H of the blade body. In order to achieve a better noise reduction effect, different noise reduction structures 5 are arranged on two sides of the intersection point C, and the design of the noise reduction structures 5 is based on the intersection point starting layout. Assuming that B1 is the trailing edge of the first blade, B2 is the outer edge of the first blade, and point C is the intersection point, the structural form of the noise reduction structure 5 disposed on the edge CO1 on one side of the intersection point C may be a wave-shaped structure, and the structural form of the noise reduction structure 5 disposed on the edge CO2 on the other side of the intersection point C may be a saw-tooth structure.
Correspondingly, the embodiment of the invention also provides an axial flow fan, which comprises the clustering blade structure in any one of the embodiments.
In this embodiment, thanks to the improvement of the above-mentioned cluster fan blade, this axial fan has the advantage that the air output is big and the noise is low.
Correspondingly, the embodiment of the invention also provides an air conditioner, which comprises the axial flow fan.
In this embodiment, benefit from the improvement of above-mentioned cluster fan blade, this air conditioner has the air output greatly and the advantage that the noise is low.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that modifications and variations can be effected by one skilled in the art in light of the above teachings without undue experimentation. Therefore, any technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the present inventive concept should be within the scope of protection defined by the present claims.

Claims (20)

1. The double-fan-blade clustering fan blade structure is characterized by comprising a fixed framework, wherein at least one group of clustering fan blades are arranged on the fixed framework, each clustering fan blade comprises a first fan blade and a second fan blade, the blade root of the first fan blade is connected with the fixed framework, the blade root of the second fan blade is connected with the fixed framework, and the overall structure of the second fan blade is in a step shape.
2. The dual-blade clustering blade structure according to claim 1, wherein the second blade is divided into an inner blade, a connecting blade and an outer blade in a step shape, and the inner blade, the connecting blade and the outer blade are sequentially connected to form the step shape.
3. The dual-blade clustering blade structure according to claim 2, wherein the windward side of the outer blade is closer to the windward point than the windward side of the inner blade.
4. The dual-blade clustering blade structure of claim 1, further comprising a noise reduction structure, wherein the noise reduction structure is disposed on an edge of a connection end of the first blade and the fixed framework, and/or an edge of a connection end of the second blade and the fixed framework.
5. The dual-blade clustering blade structure according to claim 1, wherein a noise reduction structure is provided at a junction between a leading edge and an outer edge of the first blade and/or a junction between a trailing edge and an outer edge of the first blade.
6. The dual-blade clustering blade structure according to claim 1, wherein a noise reduction structure is provided at a junction between a leading edge and an outer edge of the second blade and/or a junction between a trailing edge and an outer edge of the second blade.
7. The dual-blade clustering blade structure according to claim 1, wherein noise reduction structures are provided on upper and lower edges of the fixed framework.
8. The dual-blade clustering blade structure according to claim 2, wherein a noise reduction structure is provided at an edge of a joint of the inner blade and the connecting blade, and/or an edge of a joint of the outer blade and the connecting blade.
9. The dual-blade clustering blade structure according to any one of claims 4 to 8, wherein the noise reduction structure is configured as any one or a combination of any multiple structures of a sawtooth structure, a wave structure, a V-shaped structure, a W-shaped structure and a semicircular structure.
10. The dual-blade clustering blade structure according to any one of claim 9, wherein the noise reduction structure comprises any two different shape structures.
11. The dual-blade clustering blade structure according to claim 10, wherein a secondary noise reduction structure is further provided on an edge of the noise reduction structure.
12. The dual-blade clustering blade structure of claim 1, wherein the first and second blades are arranged in a spaced apart arrangement.
13. The dual-blade clustering blade structure according to any one of claim 1, wherein a gap in height between the first blade and the second blade is not less than 10 mm.
14. The dual-blade clustering blade structure of claim 1, wherein the inner setting angle of the first blade is set to 15 ° -75 °, the outer setting angle is set to 10 ° -70 °, and/or the inner setting angle of the second blade is set to 15 ° -75 °, and the outer setting angle is set to 10 ° -70 °.
15. The dual-blade clustering blade structure according to claim 1, wherein a groove is provided on one side of the fixing frame, and a plurality of reinforcing ribs are uniformly provided in the groove.
16. The dual-blade clustering blade structure according to claim 1, wherein the fixed framework is configured to be cylindrical or truncated cone-shaped.
17. The dual-blade clustering blade structure of claim 1, wherein the clustering blade has a plurality of blade solidity values, wherein the blade solidity value calculation formula is as follows:
Figure FDA0002348418530000021
(i and n are positive integers, i is more than or equal to 1, and n is more than i), wherein S isDThe blade real number value L of the clustered blades under the diameter DiIs the chord length of the blade i,
Figure FDA0002348418530000022
is the sum of the chord lengths of the blades of each blade at the same diameter D, and n is the number of blades present at the same diameter D.
18. The dual-blade clustering blade structure of claim 17, wherein the clustering blade has a plurality of diameters D, the diameters D range from 20mm to 1.5m, and the blade solidity value ranges from 0.05 to 0.95.
19. An axial flow fan, characterized in that, comprises the double-blade cluster blade structure of any one of claims 1-18.
20. An air conditioner characterized by comprising the axial flow fan as recited in claim 19.
CN201911405113.9A 2019-12-31 2019-12-31 Double-blade cluster blade structure, axial flow fan and air conditioner Pending CN111059076A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111894899A (en) * 2020-08-26 2020-11-06 珠海格力电器股份有限公司 Fan blade, fan blade impeller, fan assembly and air conditioning equipment
CN111894900A (en) * 2020-08-26 2020-11-06 珠海格力电器股份有限公司 Fan blade, fan blade impeller, fan assembly and air conditioning unit
EP4008911A1 (en) * 2020-12-03 2022-06-08 LG Electronics Inc. Axial fan for outdoor unit of air conditioner
CN116745532A (en) * 2021-01-21 2023-09-12 大金工业株式会社 Propeller fan and air conditioner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111894899A (en) * 2020-08-26 2020-11-06 珠海格力电器股份有限公司 Fan blade, fan blade impeller, fan assembly and air conditioning equipment
CN111894900A (en) * 2020-08-26 2020-11-06 珠海格力电器股份有限公司 Fan blade, fan blade impeller, fan assembly and air conditioning unit
CN111894900B (en) * 2020-08-26 2022-01-28 珠海格力电器股份有限公司 Fan blade, fan blade impeller, fan assembly and air conditioning unit
EP4008911A1 (en) * 2020-12-03 2022-06-08 LG Electronics Inc. Axial fan for outdoor unit of air conditioner
CN114607640A (en) * 2020-12-03 2022-06-10 Lg电子株式会社 Axial flow fan arranged on outdoor unit of air conditioner
AU2021277760B2 (en) * 2020-12-03 2023-10-05 Lg Electronics Inc. Axial fan for outdoor unit of air conditioner
US11828476B2 (en) 2020-12-03 2023-11-28 Lg Electronics Inc. Axial fan for outdoor unit of air conditioner
CN114607640B (en) * 2020-12-03 2024-04-05 Lg电子株式会社 Axial flow fan arranged on outdoor unit of air conditioner
CN116745532A (en) * 2021-01-21 2023-09-12 大金工业株式会社 Propeller fan and air conditioner

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