CN112049819A - Wind wheel, fan and air conditioner outdoor unit - Google Patents

Wind wheel, fan and air conditioner outdoor unit Download PDF

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Publication number
CN112049819A
CN112049819A CN202010860154.3A CN202010860154A CN112049819A CN 112049819 A CN112049819 A CN 112049819A CN 202010860154 A CN202010860154 A CN 202010860154A CN 112049819 A CN112049819 A CN 112049819A
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CN
China
Prior art keywords
blade
wind wheel
edge
wheel
grooves
Prior art date
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Pending
Application number
CN202010860154.3A
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Chinese (zh)
Inventor
朱训智
王元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioning Electric Co Ltd
Priority to CN202010860154.3A priority Critical patent/CN112049819A/en
Publication of CN112049819A publication Critical patent/CN112049819A/en
Priority to PCT/CN2021/108153 priority patent/WO2021233483A1/en
Pending legal-status Critical Current

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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
    • F04D29/38—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
    • F04D29/26—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
    • F04D29/386—Skewed 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a wind wheel, a fan and an air conditioner outdoor unit. The invention aims to solve the problem that the strength of a wind wheel is reduced when the thickness of blades and a hub of the wind wheel is reduced in the conventional axial flow fan, so that an impeller is easily damaged and even broken. For this purpose, the invention forms a plurality of oval grooves distributed along the outer circumference of the suction surface of the blade of the wind wheel, and the polygonal grooves on the suction surface of the blade are arranged to form the circumference of the blade along the root, the leading edge, the side of the oval grooves far away from the outer circumference, and the trailing edge of the blade in sequence. Therefore, by arranging the polygonal groove and the oval grooves which are matched with the shape and the size of the blade, the weight of the blade is reduced, the integral connection strength of the blade can be ensured, and the problem that the strength of the blade cannot meet the use requirement after the blade is thinned is solved.

Description

Wind wheel, fan and air conditioner outdoor unit
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a wind wheel, a fan and an air conditioner outdoor unit.
Background
The air conditioner becomes an essential electrical product in life, and the use experience of people is directly influenced by the quality of the performance of the air conditioner. An air conditioner generally includes an outdoor unit and an indoor unit, and a fan in the outdoor unit is configured to dissipate heat and cold generated by an outdoor heat exchanger.
The fan used in the air-conditioning outdoor unit is generally an axial flow fan, the air volume, noise and air pressure of the axial flow fan are important indexes for evaluating the performance of the axial flow fan, and the weight of a wind wheel is reduced mainly by reducing the thickness of blades of the wind wheel or reducing the thickness of a hub and the like in the conventional axial flow fan so as to achieve the purpose of reducing the load of a motor for driving the wind wheel and the noise of the axial flow fan.
However, the existing axial flow fan has the problem that after the thickness of the wind wheel blade and the hub is reduced, the strength of the wind wheel is also reduced, so that the impeller is easily damaged and even broken.
Accordingly, there is a need in the art for a new wind wheel, fan and outdoor unit of an air conditioner to solve the above problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem that the strength of a wind wheel is reduced when the thicknesses of blades and a hub of the wind wheel are reduced in the conventional axial flow fan, so that an impeller is easily damaged or even broken, the invention provides a wind wheel, a fan and an air conditioner outdoor unit.
Firstly, the invention provides a wind wheel, which comprises a hub and at least one blade; the root of the blade is connected to the outer side wall of the hub, and the blade is provided with a concave curve-shaped front edge, a convex curve-shaped tail edge and an outer peripheral edge, wherein the front edge is connected with the root of the blade, and the outer peripheral edge is connected with the front edge and the tail edge; a plurality of oval grooves distributed along the outer periphery of the suction surface of the blade are formed, the long axes of the oval grooves point to the outer periphery and are sequentially inclined towards the front edge in the direction from the tail edge to the front edge, and the areas of the oval grooves are gradually reduced in the direction from the tail edge to the front edge; the suction surface of the blade is also provided with a polygonal groove, and the polygonal groove is arranged to sequentially form the periphery of the blade along the root of the blade, the front edge, one side of the plurality of elliptical grooves far away from the outer peripheral edge and the tail edge.
As a preferred technical solution of the above wind wheel provided by the present invention, the length of the major axis and the minor axis of each elliptical groove is determined according to the following formula: a isn＝a1+(n-1)×c；bn＝b1+ (n-1). times.d; wherein, anIs the length of the long axis of the nth elliptical groove of the blade in the direction from the trailing edge to the leading edge thereof, a1The length of the long axis of the 1 st oval groove of the blade in the direction from the tail edge to the front edge of the blade is c, which is the difference of the long axes between two adjacent oval grooves and is a negative value; bnThe length of the minor axis of the nth elliptical groove of the blade in the direction from the trailing edge to the leading edge thereof, b1Is the length of the minor axis of the 1 st elliptical groove of the blade in the direction from its trailing edge to its leading edge, d is the difference in minor axes between two adjacent elliptical grooves and is negative.
As a preferable technical solution of the above wind wheel provided by the present invention, when the outer diameter of the wind wheel is R, a1＝1/3R，c＝-0.072a，b11/10R, d-0.125 b; the distance between the circle centers of the oval grooves and the circle center of the wind wheel is 0.8R.
As a preferred technical solution of the wind wheel provided by the present invention, an included angle α between a connecting line between a center of the elliptical groove on the blade near the trailing edge thereof and a center of the wind wheel and a connecting line between an outermost end of the trailing edge and the center of the wind wheel satisfies: alpha is more than 2 degrees and less than 5 degrees; and/or an included angle beta formed between connecting lines between the respective circle centers of the two adjacent elliptic grooves and the circle center of the wind wheel satisfies the following condition: beta is more than 10 degrees and less than 15 degrees; and/or the included angle between the connecting line of the outermost end of the trailing edge of the blade and the circle center of the wind wheel and the connecting line of the outermost end of the leading edge and the circle center of the wind wheel satisfies the following conditions: 81 degrees is less than 85 degrees.
As a preferable technical solution of the wind wheel provided by the present invention, the trailing edge of the blade is provided with a concave structure in the shape of an obtuse triangle, and an included angle θ between a connecting line between the lowest point of the concave structure and the center of the wind wheel and a connecting line between the outermost end of the trailing edge of the blade and the center of the wind wheel satisfies: theta is more than 5 degrees and less than 7 degrees.
As a preferable technical solution of the wind turbine provided by the present invention, the number of the blades is plural, the plural blades are uniformly arranged on the outer side wall of the hub along the circumferential direction of the hub, and the projection of the leading edge of each blade and the projection of the trailing edge of the adjacent blade on the outer side wall of the hub do not coincide.
As a preferable technical solution of the wind wheel provided by the present invention, the hub includes an outer ring wheel having an outer sidewall connected with the at least one blade and an inner ring wheel coaxially disposed inside the outer ring wheel, and the inner ring wheel forms a shaft hole for connecting with an output shaft of a motor; a plurality of radial plates which are parallel to the axis of the wind wheel and are arranged at intervals are connected between the inner ring wheel and the outer ring wheel; two adjacent radials with outer ring wheel with be connected with between the inner circle wheel with the axis vertically diaphragm of wind wheel, every the middle part of diaphragm all is provided with the through-hole.
As a preferable technical solution of the wind wheel provided by the present invention, a plurality of limiting grooves are provided on the inner circumferential surface of the shaft hole at intervals along the axial direction thereof, an aluminum alloy shaft sleeve which is fitted to the limiting grooves is installed in the shaft hole, and the aluminum alloy shaft sleeve is used for connecting with an output shaft of a motor.
Then, the invention also provides a fan, which comprises a motor and the wind wheel in any technical scheme; and the output shaft of the motor is connected with the hub of the wind wheel.
Finally, the invention also provides an air conditioner outdoor unit, wherein the fan is arranged in the air conditioner outdoor unit.
In the wind wheel, the fan and the outdoor unit of the air conditioner, a plurality of oval grooves distributed along the outer periphery are formed on the suction surface of the blade of the wind wheel, the long axes of the oval grooves point to the outer periphery and are sequentially inclined towards the front edge in the direction from the tail edge to the front edge, and the areas of the oval grooves are gradually reduced in the direction from the tail edge to the front edge; and the polygonal grooves on the suction surface of the blade are arranged to form the periphery of the blade along the root part, the front edge, the side, away from the outer periphery, of the elliptical grooves and the tail edge of the blade in sequence. Therefore, by arranging the polygonal groove and the oval grooves which are matched with the shape and the size of the blade, the weight of the blade is reduced, the integral connection strength of the blade can be ensured, and the problem that the strength of the blade cannot meet the use requirement after the blade is thinned is solved.
In addition, in the wind wheel, the fan and the air conditioner outdoor unit provided by the invention, a plurality of radial plates which are parallel to the axis of the wind wheel and are arranged at intervals are connected between the inner ring wheel and the outer ring wheel of the hub; and transverse plates vertical to the axis of the wind wheel are connected between the two adjacent radial plates and the outer ring wheel and the inner ring wheel, and a through hole is formed in the middle of each transverse plate. Therefore, the overall weight of the wind wheel is further reduced on the basis of ensuring the connection strength of the hub through the structure of the hub, so that the load of a motor in the fan is better reduced, and the noise of the fan is reduced.
Drawings
The wind wheel, the fan and the outdoor unit of the air conditioner according to the present invention will be described with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic structural view of a wind wheel of the present embodiment;
fig. 2 is a schematic structural view of a hub in the wind rotor of the present embodiment;
fig. 3 is a schematic structural view of the aluminum alloy shaft sleeve and the shaft hole in the wind wheel of the embodiment;
FIG. 4 is a diagram of the noise comparison test result of the fan of this embodiment and the original fan at different rotation speeds.
List of reference numerals
1-a hub; 11-outer ring wheel; 12-inner ring wheel; 121-axial hole; 13-a web; 14-a transverse plate; 141-a through hole; 15-aluminum alloy shaft sleeve;
2-a blade; 21-leading edge; 22-trailing edge; 23-an outer peripheral edge; 24-an elliptical groove; 25-polygonal grooves; 26-concave structure.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the rotor of the figures is illustrated with 4 blades, the number of blades on the rotor is not constant and can be adjusted as desired by one skilled in the art to suit a particular application without departing from the principles of the present invention. For example, the number of blades on the impeller in the present embodiment may also be 2 or 4, etc.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to solve the above problems in the prior art, that is, to solve the problem that the existing axial flow fan has the problem that the strength of the wind wheel is reduced after the thicknesses of the blades and the hub of the wind wheel are reduced, so that the impeller is easily damaged or even broken, the embodiment provides a wind wheel, a fan and an air conditioner outdoor unit.
First, as shown in fig. 1 to 3, the present embodiment provides a wind turbine, which includes a hub 1 and at least one blade 2; the root of the blade 2 is connected with the outer side wall of the hub 1, and the blade 2 is provided with a front edge 21 which is connected with the root and is in a concave curve shape, a tail edge 22 which is in a convex curve shape and an outer peripheral edge 23 which connects the front edge 21 and the tail edge 22; the suction surface of the blade 2 is provided with a plurality of oval grooves 24 distributed along the outer periphery 23, the major axes of the oval grooves 24 point to the outer periphery 23 and are sequentially inclined towards the front edge 21 in the direction from the tail edge 22 to the front edge 21, and the areas of the oval grooves 24 are gradually reduced in the direction from the tail edge 22 to the front edge 21; the suction side of the blade 2 is further formed with a polygonal groove 25, the polygonal groove 25 being arranged to form its periphery in sequence along the root of the blade 2, the leading edge 21, the side of the plurality of elliptical grooves 24 remote from the outer peripheral edge 23 and the trailing edge 22.
Illustratively, it can be understood that the suction surface of the blade 2, i.e. the air inlet side of the blade 2, in the present embodiment, a plurality of oval grooves 24 are provided on the suction surface of the blade 2, the grooves themselves are for reducing the weight of the blade 2, and the portions of the blade 2 spaced between adjacent oval grooves 24 have the function of serving as reinforcing ribs to ensure the strength of the blade 2 as a whole.
Meanwhile, the shape of the polygonal groove 25 provided on the suction surface of the blade 2 is also adapted to the shape and size of the blade 2 itself, and the position and size of the plurality of elliptical grooves 24 provided, and the polygonal groove 25 is used to reduce the weight of the blade 2 near the root position. The portions between the periphery of the polygonal groove 25 and the root of the blade 2, the leading edge 21, the side of the plurality of elliptical grooves 24 away from the outer peripheral edge 23, and the trailing edge 22 have the function of serving as reinforcing ribs to secure the strength of the entire blade 2, and further improve the operating efficiency of the fan.
In summary, the polygonal groove 25 and the elliptical grooves 24 of the blade 2 according to the present embodiment are not randomly arranged, and the positions, sizes and shapes of the polygonal grooves and the elliptical grooves are considered to reduce the weight of the blade 2 and ensure the strength of the blade 2.
In the wind wheel provided by the embodiment, a plurality of oval grooves 24 distributed along the outer periphery 23 of the suction surface of the blade 2 of the wind wheel are formed, the long axes of the oval grooves 24 are all directed to the outer periphery 23 and are sequentially inclined towards the front edge 21 in the direction from the tail edge 22 to the front edge 21, and the areas of the oval grooves 24 are gradually reduced in the direction from the tail edge 22 to the front edge 21; and the polygonal groove 25 on the suction side of the blade 2 is arranged to form its periphery in the order of the root of the blade 2, the leading edge 21, the side of the plurality of elliptical grooves 24 remote from the outer periphery 23 and the trailing edge 22. Therefore, by arranging the polygonal groove 25 and the oval grooves 24 which are matched with the shape and the size of the blade 2, the weight of the blade 2 is reduced, the integral connection strength of the blade 2 can be ensured, and the problem that the strength of the blade 2 cannot meet the use requirement after the blade 2 is thinned is solved.
As a preferred embodiment of the above wind wheel provided in this embodiment, the length of the major axis and the minor axis of each elliptical groove 24 is determined according to the following formula: a isn＝a1+(n-1)×c；bn＝b1+ (n-1). times.d; wherein, anIs the length of the major axis of the nth elliptical groove 24 of the blade 2 in the direction from its trailing edge 22 to its leading edge 21, a1Is the length of the major axis of the 1 st elliptical groove 24 of the blade 2 in the direction from its trailing edge 22 to its leading edge 21, c is the difference in major axis between two adjacent elliptical grooves 24 and is negative; bnThe length of the minor axis of the nth elliptical groove 24 of the blade 2 in the direction from the trailing edge 22 to the leading edge 21 thereof，b1The length of the minor axis of the 1 st elliptical groove 24 of the blade 2 in the direction from its trailing edge 22 to its leading edge 21, d is the difference in minor axes between two adjacent elliptical grooves 24 and is negative.
Illustratively, in the present embodiment, the major axes and the minor axes of the plurality of elliptical grooves 24 are arranged in an arithmetic progression, so that the weights of different positions of the blade 2 are gradually reduced in a stepwise manner, and the weights of the various parts of the blade 2 are substantially equal, thereby being beneficial to ensuring the operating efficiency of the fan.
Meanwhile, the variation of the size of the elliptical groove 24 and the variation of the long axis direction are both adapted to the shape and size of the blade 2 itself so as to sufficiently and reasonably reduce the weight of the blade 2 without greatly reducing the strength of itself.
As a preferred embodiment of the above wind wheel provided in this embodiment, when the outer diameter of the wind wheel is R, a is1＝1/3R，c＝-0.072a，b11/10R, d-0.125 b; the distance between the circle centers of the oval grooves 24 and the circle center of the wind wheel is 0.8R.
It is to be understood that the above-mentioned dimensions of the oval-shaped groove 24 are designed as a preferred embodiment of the present embodiment, and a new technical solution formed by the adjustment of numerical values made by those skilled in the art still falls within the scope of the present embodiment.
As a preferred embodiment of the above wind wheel provided in this embodiment, an included angle α between a connecting line between the center of the elliptical groove 24 on the blade 2 near the trailing edge 22 and the center of the wind wheel and a connecting line between the outermost end of the trailing edge 22 and the center of the wind wheel satisfies: alpha is more than 2 degrees and less than 5 degrees, and the preferred alpha is 3 degrees; and/or an included angle beta formed between connecting lines of respective circle centers of two adjacent elliptic grooves 24 and the circle center of the wind wheel satisfies the following condition: beta is more than 10 degrees and less than 15 degrees, and the preferred beta is 13 degrees; and/or the included angle between the connecting line of the outermost end of the trailing edge 22 of the blade 2 and the circle center of the wind wheel and the connecting line of the outermost end of the leading edge 21 and the circle center of the wind wheel satisfies the following conditions: 81 < 85 deg., preferably 83 deg., so as to determine the size of the chord of the blade 2 and the optimal distance between the two blades 2, at which the size and layout of the blades 2 are more reasonable.
As a preferred embodiment of the above wind wheel provided in this embodiment, the trailing edge 22 of the blade 2 is provided with a concave structure 26 in the shape of an obtuse triangle, and an included angle θ between a connecting line between the lowest point of the concave structure 26 and the center of the wind wheel and a connecting line between the outermost end of the trailing edge 22 of the blade 2 and the center of the wind wheel satisfies: theta is more than 5 degrees and less than 7 degrees.
Illustratively, the hub 1 is connected with a motor, and the rotation of the motor shaft drives the hub 1 to rotate, thereby driving the blades 2 to rotate around the axial direction, so as to enable the air flow to flow. When the blades 2 rotate around the axial direction, airflow forms vortex at the tail edges 22 of the blades 2, and the concave structures 26 close to delta-shaped shapes at the tail edges 22 of the blades 2 reduce wake vortex, so that vortex noise is reduced, and finally noise generated when the wind wheel rotates is reduced.
As a preferred embodiment of the wind turbine provided in this embodiment, the number of the blades 2 is multiple, the multiple blades 2 are uniformly arranged on the outer side wall of the hub 1 along the circumferential direction of the hub 1, and the projection of the leading edge 21 of each blade 2 and the trailing edge 22 of the adjacent blade 2 on the outer side wall of the hub 1 do not coincide.
Exemplarily, a plurality of blades 2 equipartition are in hub 1 lateral wall for the fan is more steady when rotatory, and is more even to the cutting of air current, thereby noise when further reduction wind wheel is rotatory. And the front edge 21 of each blade 2 and the tail edge 22 of the adjacent blade 2 do not coincide in projection on the end face of the hub 1, that is, the adjacent blades 2 are separated by a certain distance, and airflow does not swirl between the two adjacent blades 2, so that the air supply efficiency of the wind wheel can be further improved.
As shown in fig. 2 and 3, as a preferred embodiment of the wind wheel provided in this embodiment, the hub 1 includes an outer ring wheel 11 having at least one blade 2 connected to an outer side wall thereof, and an inner ring wheel 12 coaxially disposed inside the outer ring wheel 11, the inner ring wheel 12 being formed with a shaft hole 121 for connecting with an output shaft of a motor; a plurality of radial plates 13 which are parallel to the axis of the wind wheel and are arranged at intervals are connected between the inner ring wheel 12 and the outer ring wheel 11; and a transverse plate 14 vertical to the axis of the wind wheel is connected between the two adjacent radial plates 13 and the outer ring wheel 11 and the inner ring wheel 12, and a through hole 141 is formed in the middle of each transverse plate 14.
Therefore, the overall weight of the wind wheel is further reduced on the basis of ensuring the connection strength of the hub 1 by the structure of the hub 1, so that the load of a motor in the fan is better reduced, and the noise of the fan is reduced.
As shown in fig. 2 and fig. 3, in order to further ensure the matching between the output shaft of the motor and the hub 1, a plurality of limiting grooves are provided on the inner circumferential surface of the shaft hole 121 at intervals along the axial direction thereof, an aluminum alloy bushing 15 is installed in the shaft hole 121 and is matched with the limiting grooves, and the aluminum alloy bushing 15 is used for connecting with the output shaft of the motor.
Exemplarily, a wind wheel in an outdoor unit of an air conditioner is generally large, the torque is large during operation, if the plastic hub 1 is adopted, a certain inclination angle is caused due to the fact that the plastic hub 1 needs to be taken into consideration for demoulding, the diameters of the shaft holes 121 are different from top to bottom, gaps are not consistent when the plastic hub 1 is matched with an output shaft of a motor, the hub 1 may be abraded due to long-term operation, and certain potential safety hazards exist.
This embodiment is through installing in the shaft hole 121 of wheel hub 1 rather than the spacing groove to complex aluminum alloy axle sleeve 15, and aluminum alloy material itself has light in weight's advantage, and aluminum alloy is stand wear and tear than plastics to can effectually solve above-mentioned potential safety hazard through adopting aluminum alloy axle sleeve 15.
Then, the embodiment further provides a fan, wherein the fan comprises a motor and the wind wheel in any one of the above embodiments; the output shaft of the motor is connected with the hub 1 of the wind wheel.
Exemplarily, combining the noise comparison test results of the fan proposed in the embodiment of fig. 4 and the original fan at different rotation speeds, it can be known that the fan of the embodiment has a noise reduction amplitude close to 1dB basically under the same rotation speed condition, and the improvement effect is relatively obvious.
Finally, the embodiment also provides an outdoor unit of an air conditioner, wherein the fan is arranged in the outdoor unit of the air conditioner.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A wind wheel, characterized in that the wind wheel comprises a hub and at least one blade; the root of the blade is connected to the outer side wall of the hub, and the blade is provided with a concave curve-shaped front edge, a convex curve-shaped tail edge and an outer peripheral edge, wherein the front edge is connected with the root of the blade, and the outer peripheral edge is connected with the front edge and the tail edge;
a plurality of oval grooves distributed along the outer periphery of the suction surface of the blade are formed, the long axes of the oval grooves point to the outer periphery and are sequentially inclined towards the front edge in the direction from the tail edge to the front edge, and the areas of the oval grooves are gradually reduced in the direction from the tail edge to the front edge;
the suction surface of the blade is also provided with a polygonal groove, and the polygonal groove is arranged to sequentially form the periphery of the blade along the root of the blade, the front edge, one side of the plurality of elliptical grooves far away from the outer peripheral edge and the tail edge.
2. The wind rotor of claim 1, wherein: the length of the major axis and the minor axis of each elliptical groove is determined according to the following formula:
an＝a1+(n-1)×c；bn＝b1+(n-1)×d；
wherein, anIs the length of the long axis of the nth elliptical groove of the blade in the direction from the trailing edge to the leading edge thereof, a1The length of the long axis of the 1 st oval groove of the blade in the direction from the tail edge to the front edge of the blade is c, which is the difference of the long axes between two adjacent oval grooves and is a negative value; bnThe length of the minor axis of the nth elliptical groove of the blade in the direction from the trailing edge to the leading edge thereof, b1Is the length of the minor axis of the 1 st elliptical groove of the blade in the direction from its trailing edge to its leading edge, d is the difference in minor axes between two adjacent elliptical grooves and is negative.
3. The wind rotor of claim 2, wherein: when the outer diameter of the wind wheel is R, a1＝1/3R，c＝-0.072a，b1＝1/10R，d＝-0.125b；
The distance between the circle centers of the oval grooves and the circle center of the wind wheel is 0.8R.
4. The wind rotor of claim 1, wherein:
the included angle alpha between the connecting line of the circle center of the elliptic groove close to the tail edge of the blade and the circle center of the wind wheel and the connecting line of the outermost end of the tail edge and the circle center of the wind wheel satisfies the following conditions: alpha is more than 2 degrees and less than 5 degrees; and/or the like and/or,
an included angle beta formed between connecting lines between the respective circle centers of the two adjacent elliptic grooves and the circle center of the wind wheel meets the following requirements: beta is more than 10 degrees and less than 15 degrees; and/or the like and/or,
the included angle between the connecting line of the outermost end of the tail edge of the blade and the circle center of the wind wheel and the connecting line of the outermost end of the front edge of the blade and the circle center of the wind wheel satisfies the following conditions: 81 degrees is less than 85 degrees.
5. The wind rotor of claim 1, wherein: the trailing edge of blade is provided with the sunk structure that is blunt triangle-shaped, contained angle theta between the line between the minimum of sunk structure and the centre of a circle of wind wheel and the line between the outermost end of the trailing edge of blade and the centre of a circle of wind wheel satisfies: theta is more than 5 degrees and less than 7 degrees.
6. The wind rotor of claim 1, wherein: the blade is provided with a plurality of blades, the blades are uniformly arranged on the outer side wall of the hub along the circumferential direction of the hub, and the projection of the front edge of each blade and the projection of the tail edge of the adjacent blade on the outer side wall of the hub do not coincide.
7. The wind rotor of claim 1, wherein: the hub comprises an outer ring wheel and an inner ring wheel, wherein the outer side wall of the outer ring wheel is connected with the at least one blade, the inner ring wheel is coaxially arranged inside the outer ring wheel, and the inner ring wheel is provided with a shaft hole for being connected with an output shaft of a motor;
a plurality of radial plates which are parallel to the axis of the wind wheel and are arranged at intervals are connected between the inner ring wheel and the outer ring wheel; two adjacent radials with outer ring wheel with be connected with between the inner circle wheel with the axis vertically diaphragm of wind wheel, every the middle part of diaphragm all is provided with the through-hole.
8. The wind rotor of claim 7, wherein: a plurality of limiting grooves are formed in the inner circumferential surface of the shaft hole at intervals along the axial direction of the shaft hole, an aluminum alloy shaft sleeve matched with the limiting grooves in the shaft hole is installed in the shaft hole, and the aluminum alloy shaft sleeve is used for being connected with an output shaft of the motor.
9. A fan, characterized by: the fan comprising an electric motor and the wind rotor of any of claims 1 to 8;
and the output shaft of the motor is connected with the hub of the wind wheel.
10. An outdoor unit for an air conditioner, comprising: the outdoor unit of an air conditioner is provided with the fan of claim 9.
CN202010860154.3A 2020-08-31 2020-08-31 Wind wheel, fan and air conditioner outdoor unit Pending CN112049819A (en)

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CN202010860154.3A CN112049819A (en) 2020-08-31 2020-08-31 Wind wheel, fan and air conditioner outdoor unit
PCT/CN2021/108153 WO2021233483A1 (en) 2020-08-31 2021-07-23 Impeller, fan, and air conditioner outdoor unit

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CN202010860154.3A CN112049819A (en) 2020-08-31 2020-08-31 Wind wheel, fan and air conditioner outdoor unit

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Application publication date: 20201208