CN108507017B - Fan blade structure and air conditioner with same - Google Patents
Fan blade structure and air conditioner with same Download PDFInfo
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- CN108507017B CN108507017B CN201810215818.3A CN201810215818A CN108507017B CN 108507017 B CN108507017 B CN 108507017B CN 201810215818 A CN201810215818 A CN 201810215818A CN 108507017 B CN108507017 B CN 108507017B
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- fan blade
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- blade structure
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- 230000007704 transition Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000000875 corresponding effect Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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Classifications
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- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a fan blade structure and an air conditioner with the same. The fan blade structure comprises a hub; the first end of the fan blade is connected with the hub, the second end of the fan blade is far away from the hub, and an air guide inclined plane is arranged on the side edge of at least part of the fan blade and used for reducing the resistance of the fan blade to air flow when the fan blade rotates. The side edges of the fan blades are provided with the air guide inclined planes, so that the air flow resistance of the fan blade structure during rotation is effectively reduced, the energy consumption of the fan blade for working by overcoming the air flow resistance in the rotation process is reduced, and the air guide efficiency of the fan blade is effectively improved. Meanwhile, as the wind guide inclined plane is arranged on the side edge of the fan blade, the fan blade is milder when cutting the air flow, and therefore noise generated when the fan blade cuts the air flow is effectively reduced.
Description
Technical Field
The invention relates to the technical field of air conditioner equipment, in particular to a fan blade structure and an air conditioner with the fan blade structure.
Background
In the prior art, the structural arrangement of the axial flow fan blade is unreasonable, so that the axial flow fan blade has the defects of high noise and the like during operation. Further, the axial flow fan blade in the prior art is adopted, so that the problem of low air guiding efficiency of the fan blade is caused under a certain rotating speed.
Disclosure of Invention
The invention mainly aims to provide a fan blade structure and an air conditioner with the same, so as to solve the problem of low air guiding efficiency of axial flow fan blades in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a fan blade structure, including: a hub; the first end of the fan blade is connected with the hub, the second end of the fan blade is far away from the hub, and an air guide inclined plane is arranged on the side edge of at least part of the fan blade and used for reducing the resistance of the fan blade to air flow when the fan blade rotates.
Further, the fan blade is provided with a first side, a second side and a third side which are sequentially connected, the first side is located on the windward side of the fan blade, the second side is formed at the end part of the second end of the fan blade, the third side is located on the leeward side of the fan blade, and the air guide inclined plane is arranged on the first side and the second side and located on the same side of the fan blade.
Further, the width of the air guiding inclined plane is L1, wherein L1 is more than or equal to 0 and less than or equal to 50mm.
Further, the thickness of the first side edge and/or the second side edge is L2, and L2 is more than or equal to 0 and less than or equal to 10mm.
Further, the end molded lines of the second ends of the fan blades form upper wing molded lines of the fan blades, the upper wing molded lines extend gradually along the axis direction of the hub, the upper wing molded lines comprise a first arc section and a second arc section, the first arc section and the second arc section are in smooth transition, and the curvature radius of the first arc section is different from that of the second arc section.
Further, the curvature radius of the second arc section is R, and the curvature radius of the first arc section is R/3.
Further, the central angle corresponding to the first arc section is 30 degrees, and/or the central angle corresponding to the second arc section is 11 degrees.
Further, the end profile of the first end of the fan blade forms a lower wing profile of the fan blade, the lower wing profile is an arc, and a projection line of the first arc section on the hub is intersected with the lower wing profile.
Further, the central angle corresponding to the lower wing molded line is the same as the central angle corresponding to the first arc section.
Further, the molded line of the first side is an arc, and the circle where the arc is located passes through the geometric center of the hub.
Further, the fan blades are a plurality of, and the fan blades are evenly arranged along the peripheral surface of the hub.
Further, the centroid of the fan blade is located on a straight line passing through the geometric center of the hub.
According to another aspect of the present invention, there is provided an air conditioner including a fan blade structure, wherein the fan blade structure is the above-mentioned fan blade structure.
By applying the technical scheme of the invention, the wind guide inclined plane is arranged on the side edge of the fan blade, so that the airflow resistance of the fan blade structure during rotation is effectively reduced, the energy consumption of the fan blade for overcoming the airflow resistance in the rotation process is reduced, and the wind guide efficiency of the fan blade is effectively improved. Meanwhile, as the wind guide inclined plane is arranged on the side edge of the fan blade, the fan blade is milder when cutting the air flow, and therefore noise generated when the fan blade cuts the air flow is effectively reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic structural view of a first embodiment of a fan blade structure according to the present invention;
fig. 2 shows a schematic structural view of a second embodiment of a fan blade structure according to the present invention;
FIG. 3 shows an embodiment of a profile of a fan blade structure according to the present invention;
fig. 4 shows a schematic structural view of a third embodiment of a fan blade structure according to the present invention;
fig. 5 shows a schematic structural view of a fourth embodiment of a fan blade structure according to the present invention;
fig. 6 shows a schematic structural view of a fifth embodiment of a fan blade structure according to the present invention.
Wherein the above figures include the following reference numerals:
10. a hub;
20. a fan blade; 21. a first side; 22. a second side; 23. a third side;
30. an air guiding inclined plane;
40. an upper wing profile; 41. a first arc segment; 42. a second arc segment;
50. a lower wing profile;
60. and (5) water ring beating.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.
Referring to fig. 1 to 6, according to an embodiment of the present invention, a fan blade structure is provided.
Specifically, the blade structure includes a hub 10 and blades 20. The first end of the fan blade 20 is connected to the hub 10. The second end of the fan blade 20 is arranged far away from the hub 10, and at least part of the side edges of the fan blade 20 are provided with air guiding inclined planes 30. The air guiding inclined plane 30 is used for reducing resistance of the fan blade 20 to air flow during rotation.
In the embodiment, the air guide inclined plane is arranged on the side edge of the fan blade, so that the air flow resistance of the fan blade structure during rotation is effectively reduced, the energy consumption of the fan blade for overcoming the air flow resistance in the rotation process is reduced, and the air guide efficiency of the fan blade is effectively improved. Meanwhile, as the wind guide inclined plane is arranged on the side edge of the fan blade, the fan blade is milder when cutting the air flow, and therefore noise generated when the fan blade cuts the air flow is effectively reduced.
Specifically, as shown in fig. 1, the fan blade 20 has a first side 21, a second side 22, and a third side 23 that are sequentially connected. The first side 21 is located on the windward side of the fan blade 20, the second side 22 is formed at the end of the second end of the fan blade 20, the third side 23 is located on the leeward side of the fan blade 20, and the air guiding inclined plane 30 is disposed on the first side 21 and the second side 22 and located on the same side of the fan blade 20. As shown in fig. 2, the windward side is the side where the air flow is cut to achieve wind guiding during the rotation of the fan blade, and the leeward side is the side opposite to the windward side. The arrangement can improve the wind guiding efficiency of the fan blade.
In order to further improve the air guiding efficiency of the fan blade, the width of the air guiding inclined plane 30 can be set to be L1, wherein L1 is more than or equal to 0 and less than or equal to 50mm. The thickness of the first side edge 21 and the second side edge 22 is set to L2, and 0.ltoreq.L2.ltoreq.10mm.
As shown in fig. 3, the end profile of the second end of the fan blade 20 forms the upper airfoil line 40 of the fan blade 20. The upper wing profile 40 extends gradually in the axial direction of the hub 10. The upper airfoil line 40 includes a first arc segment 41 and a second arc segment 42, the first arc segment 41 and the second arc segment 42 smoothly transition, and a radius of curvature of the first arc segment 41 is different from a radius of curvature of the second arc segment 42. The arrangement can effectively improve the air guiding efficiency of the fan blade.
Preferably, the radius of curvature of the second arc segment 42 is R, and the radius of curvature of the first arc segment 41 is R1, wherein r1=r/3. Wherein, the central angle corresponding to the first arc section 41 is 30 degrees, and the central angle corresponding to the second arc section 42 is 11 degrees.
As shown in fig. 3, the end profile of the first end of the blade 20 forms a lower airfoil line 50 of the blade 20, the lower airfoil line 50 being an arc, and the projection line of the first arc segment 41 on the hub 10 intersecting the lower airfoil line 50. The arrangement can enable the structure of the fan blade to achieve the optimal design, and effectively improves the air guiding efficiency of the fan blade.
As shown in fig. 6, the first side 21 has a circular arc shape, and the circle in which the circular arc is located passes through the geometric center of the hub 10. The arrangement further optimizes the structure of the windward side of the fan blade, further improves the wind guiding efficiency of the fan blade and reduces the noise generated when the fan blade guides wind.
As shown in fig. 4 and 5, the plurality of blades 20 are provided, and the plurality of blades 20 are uniformly disposed along the outer circumferential surface of the hub 10. Preferably, the number of the fan blades 20 is five.
The fan blade structure in the above embodiment may also be used in the technical field of air conditioner devices, that is, according to another aspect of the present invention, an air conditioner is provided, which includes the fan blade structure, where the fan blade structure is the fan blade structure in the above embodiment.
Specifically, in the embodiment, the blade profile of the fan blade is optimized, and the fan blade structure can improve the air quantity by 15% under the same diameter and size and the same motor rotation speed. The fan blade structure can improve airflow structure, effectively reduce noise and effectively improve the air guiding efficiency of the fan blade.
The air guide inclined plane is arranged to enable the fan blade to form a gradual change region with gradually changed thickness, and the air flow is gradually cut into and separated from the gradual change region, so that the air flow cut by the fan blade is smoother. The existing axial flow fan blade is insufficient in air quantity, the overall efficiency is low at the same rotating speed, the air quantity can be improved by more than 15% by adopting the fan blade structure in the embodiment under the same load and the same motor rotating speed, the power is increased by a little but is increased by not more than 10%, the overall efficiency is effectively improved, the noise is improved, and finally the overall energy efficiency is improved when the fan blade is applied to an air conditioner.
As shown in FIG. 1, the profile edge is increased by a gradual change in L1 thickness, which is more advantageous than 10mm, but may be 0-50mm, as seen from the front. The thickness of the gradual change region (the thickness of the curved surface of the fan blade) is about 3mm, and of course, the thickness can be 0-10mm. Because of the design of the gradual change area, the wing-shaped blade tip (shown at f in fig. 2) is more flexible when sweeping the airflow in the rotating process, the noise is improved (compared with the original blade), the airflow resistance is reduced, the airflow broken by the blade tip flows along the edge of the blade, and the edge of the blade drives the blade to obtain larger air quantity.
Fig. 3 is a schematic view of upper and lower airfoil lines drawn from a top view of a fan blade. The lower wing molded line contacts with the hub round surface and is a curve. The traditional design is mostly irregular line or other pitch arc, adopts the pitch arc in this scheme, and processing is more accurate, and it is also comparatively easy to measure, can guarantee production inspection uniformity. In addition, the arc angle (radian) corresponding to the fan blade arc in the embodiment is highly correlated (or equal) to the arc angle of the first arc section of the upper wing molded line. The two ends of the first arc section and the second arc section are spliced by adopting arc lines, and the arc line of the first arc section adopts a circle center fixed at the position of 2/3 of the radius of the first half section (namely R1=1/3*R). The lower wing profile and the upper wing profile are staggered in top view, and can determine the general curved profile of the fan blade. While the determination of the lower airfoil line may estimate the optimum point by simulation calculations. As shown in fig. 3, α1 is a central angle corresponding to the second arc segment, α2 is a central angle corresponding to the lower wing profile, and α3 is a central angle corresponding to the first arc segment, where α2 may be equal to α3.
After the upper wing profile line and the lower wing profile line are determined, the edge profile line of the windward side of the fan blade is designed to be an arc line, a circle where the arc line is located passes through the center of a wheel hub, and the mass center of the whole fan blade (shown as M in fig. 6) and the center line passing through the center of the wheel hub are on the same line. Likewise, the center point of the blade edge arc may be determined by a simulation tool to determine an optimal point or advantage.
The fan blade structure in this embodiment is an axial flow fan blade, which can be used in a window air conditioner, and the outer ring is a water ring 60, as shown in fig. 4, and condensed water on the side of the evaporator is pumped to the condenser by water pumping, so as to enhance heat exchange. The axial flow fan blade can be used for a split air conditioner or other air conditioners, and only the outer ring water ring is removed.
In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a fan blade structure which characterized in that includes:
a hub (10);
the wind-guiding device comprises a wind blade (20), wherein a first end of the wind blade (20) is connected with a hub (10), a second end of the wind blade (20) is far away from the hub (10), a wind-guiding inclined plane (30) is arranged on at least part of the side edges of the wind blade (20), and when the hub (10) drives the wind blade (20) to rotate, the wind-guiding inclined plane (30) can reduce resistance of the wind blade (20) to air flow during rotation;
the fan blade (20) is provided with a first side (21), a second side (22) and a third side (23) which are sequentially connected, the first side (21) is positioned on the windward side of the fan blade (20), the second side (22) is formed at the end part of the second end of the fan blade (20), the third side (23) is positioned on the leeward side of the fan blade (20), and the air guide inclined plane (30) is arranged on the first side (21) and the second side (22) and is positioned on the same side of the fan blade (20);
the end profile of the second end of the fan blade (20) forms an upper wing profile (40) of the fan blade (20), the upper wing profile (40) gradually extends along the axial direction of the hub (10), the upper wing profile (40) comprises a first arc section (41) and a second arc section (42), the first arc section (41) and the second arc section (42) are in smooth transition, and the curvature radius of the first arc section (41) is different from the curvature radius of the second arc section (42);
the end profile of the first end of the fan blade (20) forms a lower wing profile (50) of the fan blade (20), the lower wing profile (50) is an arc, and a projection line of the first arc section (41) on the hub (10) is intersected with the lower wing profile (50).
2. The fan blade structure according to claim 1, wherein the width of the air guiding inclined plane (30) is L1, and L1 is more than or equal to 0 and less than or equal to 50mm.
3. Fan blade structure according to claim 1, characterized in that the thickness of the first side edge (21) and/or the second side edge (22) is L2, 0.ltoreq.l2.ltoreq.10mm.
4. The fan blade structure according to claim 1, wherein the radius of curvature of the second arc section (42) is R, and the radius of curvature of the first arc section (41) is R/3.
5. The fan blade structure according to claim 1, wherein,
the central angle corresponding to the first arc section (41) is 30 DEG and/or
The central angle corresponding to the second arc section (42) is 11 degrees.
6. The fan blade structure according to claim 1, wherein the central angle corresponding to the lower wing profile (50) is the same as the central angle corresponding to the first arc segment (41).
7. Fan blade structure according to claim 1, characterized in that the profile of the first side (21) is an arc of a circle passing through the geometric centre of the hub (10).
8. The fan blade structure according to claim 1, wherein the number of the fan blades (20) is plural, and the plurality of the fan blades (20) are uniformly arranged along the outer circumferential surface of the hub (10).
9. A fan blade structure according to claim 1, characterized in that the centre of mass of the fan blade (20) is located on a straight line passing through the geometrical centre of the hub (10).
10. An air conditioner comprising a fan blade structure, characterized in that the fan blade structure is as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810215818.3A CN108507017B (en) | 2018-03-15 | 2018-03-15 | Fan blade structure and air conditioner with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810215818.3A CN108507017B (en) | 2018-03-15 | 2018-03-15 | Fan blade structure and air conditioner with same |
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| Publication Number | Publication Date |
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| CN108507017A CN108507017A (en) | 2018-09-07 |
| CN108507017B true CN108507017B (en) | 2023-07-14 |
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| CN201810215818.3A Active CN108507017B (en) | 2018-03-15 | 2018-03-15 | Fan blade structure and air conditioner with same |
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| CN114165479A (en) * | 2021-12-13 | 2022-03-11 | 珠海格力电器股份有限公司 | Fan blade structure and air conditioner with same |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1089289A (en) * | 1996-09-13 | 1998-04-07 | Ebara Corp | Impeller for axial flow blower |
| JP4747784B2 (en) * | 2005-10-31 | 2011-08-17 | パナソニック株式会社 | Axial blower impeller |
| CN202091255U (en) * | 2011-06-14 | 2011-12-28 | 珠海格力电器股份有限公司 | Axial fan |
| CN103967839B (en) * | 2013-01-30 | 2016-03-16 | 珠海格力电器股份有限公司 | Axial flow fan blade and air conditioner with same |
| CN105257597B (en) * | 2015-11-12 | 2018-04-20 | 珠海格力电器股份有限公司 | Axial flow fan and axial flow fan blade thereof |
| CN106949095B (en) * | 2017-04-20 | 2018-12-07 | 浙江理工大学 | The optimization method of Low-pressure axial fan impeller blade |
| CN208237988U (en) * | 2018-03-15 | 2018-12-14 | 珠海格力电器股份有限公司 | Fan blade structure and air conditioner with same |
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