CN114439771A - Become inclined formula centrifugal impeller - Google Patents
Become inclined formula centrifugal impeller Download PDFInfo
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- CN114439771A CN114439771A CN202210080686.4A CN202210080686A CN114439771A CN 114439771 A CN114439771 A CN 114439771A CN 202210080686 A CN202210080686 A CN 202210080686A CN 114439771 A CN114439771 A CN 114439771A
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- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application relates to the technical field of impellers, in particular to a variable-inclination centrifugal impeller which comprises a chassis, a frame and blades; the middle part of the frame is an air inlet, the middle part of the chassis, which is close to one side of the frame, is provided with a rotating shaft, and the rotating shaft is externally connected with a driving shaft; the blades are arranged between the frame and the chassis, the blades are arranged around the rotating shaft at equal intervals, and air outlets are formed among the blades; the blade consists of an equal-shaped section and a deformed section, the equal-shaped section is positioned at one side close to the chassis, and the deformed section is positioned between the frame and the equal-shaped section; the thickness of the deformation section is gradually reduced in the direction from one side of the chassis to one side of the frame, and the projection area of the top of the deformation section is positioned in the projection area of the equal-shaped section; the invention can effectively improve the pneumatic performance of the fan, improve the pressure distribution of the upper end surface of the blade, and has the effects of improving the working efficiency of the impeller and reducing the weight of the blade.
Description
Technical Field
The invention relates to the technical field of impellers, in particular to a variable-inclination centrifugal impeller.
Background
The centrifugal impeller is used for being installed inside a centrifugal fan, and the centrifugal fan is generally used for air extraction or refrigeration devices such as air conditioners, refrigerators, exhaust fans and the like. The blade of the traditional centrifugal impeller is set to have the same profile of the blade profile section in the axial direction of the impeller, and the inlet attack angle is small, so that the blade channel area at the top of the impeller is weak in acting, the overall acting efficiency of the impeller is low, and the air volume is small.
Disclosure of Invention
In view of the above-mentioned drawbacks, the present invention provides a variable-pitch centrifugal impeller, in which each blade of the impeller is designed by stacking multiple blade types, so as to effectively improve the aerodynamic performance of a fan, improve the pressure distribution on the upper end surface of the blade, and improve the work efficiency of the impeller and reduce the weight of the blade.
In order to achieve the purpose, the invention adopts the following technical scheme:
a variable-inclination centrifugal impeller comprises a chassis, a frame and blades;
the middle part of the frame is an air inlet, the middle part of the chassis, which is close to one side of the frame, is provided with a rotating shaft, and the rotating shaft is externally connected with a driving shaft;
the blades are arranged between the frame and the chassis, the blades are arranged around the rotating shaft at equal intervals, and air outlets are formed among the blades;
the blade consists of an equal-shaped section and a deformed section, the equal-shaped section is positioned at one side close to the chassis, and the deformed section is positioned between the frame and the equal-shaped section; the thickness of the deformation section is gradually reduced in the direction from one side of the chassis to one side of the frame, and the projection area of the top of the deformation section in the direction perpendicular to the chassis is located in the projection area of the equal-shaped section in the direction perpendicular to the chassis.
Preferably, the front and the back of the blade are cambered surfaces which are bent towards the same side, the front profile of the deformation section is overlapped with the front profile of the equal-shaped section, the bottom of the deformation section is overlapped with and connected with the top of the equal-shaped section, and the back of the deformation section is gradually narrowed towards one side of the front.
Preferably, the thinnest part of the top of the deformation section has a thickness of LA1, and the maximum thickness is LA 2; the thinnest part of the equal-shaped section has the thickness of LB1, and the maximum thickness is LB2, wherein 0 < LA2-LA1 < (LB2-LB 1)/2.
Preferably, the thickness LA1 at the thinnest point of the top of the deformation section is in the range of 0.6mm to 1 mm.
Preferably, the height of the equal-shaped section is H1, the total height of the blade is H, and 1/3H & lt, H1 & lt, 3/4H.
Preferably, the outer side wall of the rotating shaft is provided with a plurality of reinforcing ribs, one end of each reinforcing rib is connected with the base plate, the other end of each reinforcing rib extends along the axial direction of the rotating shaft, and the plurality of reinforcing ribs are arranged around the rotating shaft at equal intervals.
Preferably, the bottom of the reinforcing rib is connected with the chassis, and the width of the bottom of the reinforcing rib is larger than that of the top of the reinforcing rib.
Preferably, the impeller is made of plastic and is integrally formed.
The technical scheme comprises the following beneficial effects:
the become inclined formula centrifugal impeller of this embodiment adopts multiple profile stack design on same blade, and the blade setting of traditional centrifugal impeller is the same in the profile of the profile cross-section of impeller axial direction, compares the profile design of traditional domestic plastics centrifugal impeller, and the become inclined formula centrifugal impeller of this embodiment can effectively improve the aerodynamic performance of fan, improves the pressure distribution of upper end surface in the blade. For the weaker working blade channel area at the top of the impeller (the blade profile area A), the adjusting area of the inlet attack angle of the blade profile in the embodiment is larger, so that the working effect of the blade profile area with weaker performance in the impeller is improved on the premise of ensuring the same performance of the blade profile area of the main body, and the impeller is more suitable for the complicated fan inner flow design.
Drawings
FIG. 1 is a schematic overall structure of one embodiment of the present invention;
FIG. 2 is a schematic representation of the profile dimensions of a bucket according to the present invention;
FIG. 3 is a schematic view of the vertical profile of a blade according to the present invention;
fig. 4 is a comparison between the flow channel speed cloud chart of the variable-pitch centrifugal impeller of the present embodiment and the flow channel speed cloud chart of the conventional impeller based on the B-blade profile, where (a) is the flow channel speed cloud chart of the variable-pitch centrifugal impeller in the B-blade profile zone, and (B) is the flow channel speed cloud chart of the conventional impeller in the same height zone; (c) the flow channel speed cloud picture of the variable-pitch centrifugal impeller in an AB blade profile interval, (d) the flow channel speed cloud picture of the traditional impeller in an equal height interval; (e) the flow channel speed cloud picture of the inclined centrifugal impeller in the A blade profile region is shown, and the flow channel speed cloud picture of the traditional impeller in the same height region is shown.
Wherein: 1. a chassis; 11. a rotating shaft; 2. a frame; 21. an air inlet; 3. a blade; 31. an isochaped segment; 32. a deformation section; 4. an air outlet; 5. and (5) reinforcing ribs.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in specific cases to those skilled in the art.
The following describes an oblique-type centrifugal impeller according to an embodiment of the present invention with reference to fig. 1 to 4, including a base plate 1, a frame 2, and blades 3;
the middle part of the frame 2 is provided with an air inlet 21, the middle part of the chassis 1 close to one side of the frame 2 is provided with a rotating shaft 11, and the rotating shaft 11 is externally connected with a driving shaft;
the blades 3 are arranged between the frame 2 and the chassis 1, the blades 3 are arranged around the rotating shaft 11 at equal intervals, and air outlets 4 are formed between the blades 3;
the blade 3 consists of an equal-shaped section 31 and a deformed section 32, wherein the equal-shaped section 31 is positioned at one side close to the chassis 1, and the deformed section 32 is positioned between the frame 2 and the equal-shaped section 31; the thickness of the deformation section 32 becomes thinner gradually in the direction from the chassis 1 side to the frame 2 side, and the projection area of the top of the deformation section 32 in the direction perpendicular to the chassis 1 is located in the projection area of the equal-shaped section 31 in the direction perpendicular to the chassis 1.
Specifically, as shown in fig. 2, the cross-sectional profile of the iso-shaped segment 31 is L2, which is defined as a B-lobe; the top of the deformation segment 32 has a contour of L1, defined as an A-lobe shape, and the projection of L1 is located inside the projection of L2.
The impeller is used for installing inside the fan, is equipped with a plurality of blades 3 on the impeller, and 1 one side on chassis is the bottom of impeller, and 2 one sides on the frame are the top of impeller. The become inclined formula centrifugal impeller of this embodiment adopts multiple profile stack design on same blade 3, and traditional centrifugal impeller's blade 3 sets to the profile of blade section profile on impeller axial direction all the same, compares the profile design of traditional domestic plastics centrifugal impeller, and the become inclined formula centrifugal impeller of this embodiment can effectively improve the aerodynamic performance of fan, improves the pressure distribution of upper end surface in the blade 3. For the weaker working blade channel area at the top of the impeller (the blade profile area A), the adjusting area of the inlet attack angle of the blade profile in the embodiment is larger, so that the working effect of the weaker blade profile area A in the impeller is improved on the premise of ensuring the same performance of the blade profile area B in the main body, and the impeller is more suitable for the complicated fan inner flow design.
Preferably, the front surface and the back surface of the blade 3 are both cambered surfaces bending towards the same side, the front surface profile of the deformation section 32 is overlapped with the front surface profile of the equal-shaped section 31, the bottom of the deformation section 32 is overlapped with and connected with the top of the equal-shaped section 31, and the back surface of the deformation section 32 is gradually narrowed towards the front side.
Specifically, the front surface of the blade 3 is a windward surface, the back surface of the blade 3 is a leeward surface, and the blade 3 is bent from the position with the largest diameter of the impeller to the inside of the impeller and towards one side of the front surface of the blade 3. As shown in fig. 4, (a) is a flow channel speed cloud chart of the variable-pitch centrifugal impeller in a B blade profile interval, and (B) is a flow channel speed cloud chart of the traditional impeller in an equal height interval; (c) the flow channel speed cloud picture of the variable-inclination centrifugal impeller in an AB blade type interval, (d) the flow channel speed cloud picture of the traditional impeller in an equal height interval; (e) the flow channel speed cloud picture of the variable-inclination centrifugal impeller in the A blade profile region is shown, and the flow channel speed cloud picture of the traditional impeller in the same height region is shown;
as shown in the figure, the air flow state is not obviously changed in the B blade type interval, and the main vortex and the high-speed area of the B blade type interval have similar performances;
the air flow in the AB blade type interval is changed, which is mainly characterized in that the flow of the main air flow at the position close to the air outlet 4 of the inclined centrifugal impeller is enhanced, the air flow in the impeller is more uniform at the air inlet 21 of the impeller due to the adjustment of the inlet attack angle, and the high-speed area of the air outlet 4 of the impeller is enlarged;
the air flow in the blade profile section A is obviously improved, the high-speed area of the main air flow near the air outlet 4 of the inclined centrifugal impeller is obviously increased, the near-wall surface vortex is reduced, the air flow separation in each blade profile section is inhibited, and the flow in the whole blade profile section is improved.
In summary, the variable-pitch centrifugal impeller of the present embodiment can improve the aerodynamic performance of the impeller in the axial direction AB and the interval of the blade profile a by changing the blade profile. According to actual test experiments, under the condition that the energy consumption of the impeller is not changed in the same rotating speed state, the air quantity of the variable-inclination centrifugal impeller can be improved by 2% -3%, and the variable-inclination centrifugal impeller has great use value for fan energy conservation and static pressure lifting working conditions.
Preferably, the thinnest part of the top of the deformation section 32 has a thickness of LA1, and the maximum thickness is LA 2; the thinnest part of the equal-shaped section 31 has the thickness of LB1, and the maximum thickness of LB2, wherein 0 < LA2-LA1 < (LB2-LB 1)/2.
Preferably, the thickness LA1 at the thinnest point of the top of the deformation section 32 ranges from 0.6mm to 1 mm.
Specifically, the design of blade 3 thickness in this embodiment has combined the lightweight design requirement of impeller blade profile, can be under the prerequisite of guaranteeing domestic plastics impeller strength standard, considers actual deformation effect, obtains the novel become inclined formula centrifugal impeller that can improve pneumatic performance and have the lightweight characteristic again, and blade 3 reduces heavy effect and can reach 7% -9%, has improved the utilization ratio of production material, is favorable to energy-saving manufacturing and sustainable development's environment-friendly manufacturing.
Preferably, the height of the equal-shaped section 31 is H1, the total height of the blade 3 is H, and 1/3H & lt, H1 & lt, 3/4H.
Specifically, the shape of the blade 3 is a B-blade shape within the H1 interval, and the connection between the top of the blade 3 and the frame 2 is an a-blade shape; the transition from the B blade profile to the A blade profile is formed in the height interval H2(H1 < H2 < H) of the blade 3, and the transition is defined as the AB blade profile.
Preferably, the outer side wall of the rotating shaft 11 is provided with a plurality of reinforcing ribs 5, one end of each reinforcing rib 5 is connected with the chassis 1, the other end of each reinforcing rib extends along the axial direction of the rotating shaft 11, and the plurality of reinforcing ribs 5 are arranged around the rotating shaft 11 at equal intervals.
Specifically, because the whole impeller passes through rotation axis 11 and is connected with outside actuating shaft, and the impeller itself has weight, and the impeller also probably can produce skew and rock because of centrifugal force in the rotation process, compare in traditional centrifugal impeller, this embodiment adds strengthening rib 5 on rotation axis 11, can improve the joint strength between rotation axis 11 and chassis 1 for rotation axis 11 is difficult for producing deformation when the impeller uses, is difficult for leading to rotation axis 11 to warp or split. In the present embodiment, the number of the reinforcing ribs 5 is set to five, which can better disperse the acting force.
Preferably, the bottom of the reinforcing rib 5 is connected with the chassis 1, and the width of the bottom of the reinforcing rib 5 is larger than that of the top of the reinforcing rib.
Specifically, the width of the bottom of the reinforcing rib 5 is larger than that of the top of the reinforcing rib, so that the bearing capacity of the bottom is better, and better stress and buffering effects are achieved.
Preferably, the impeller is made of plastic and is integrally formed.
Specifically, the novel centrifugal impeller of this embodiment is made for mould injection moulding integrated into one piece, has removed the process of assembly, has improved the utilization ratio and the production efficiency of manufacturing material.
Other constructions and operation of a tapered centrifugal impeller according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A becomes inclined formula centrifugal impeller which characterized in that: comprises a chassis, a frame and blades;
the middle part of the frame is an air inlet, the middle part of the chassis, which is close to one side of the frame, is provided with a rotating shaft, and the rotating shaft is externally connected with a driving shaft;
the blades are arranged between the frame and the chassis, the blades are arranged around the rotating shaft at equal intervals, and air outlets are formed among the blades;
the blade consists of an equal-shaped section and a deformed section, the equal-shaped section is positioned at one side close to the chassis, and the deformed section is positioned between the frame and the equal-shaped section; the thickness of the deformation section is gradually reduced in the direction from one side of the chassis to one side of the frame, and the projection area of the top of the deformation section in the direction perpendicular to the chassis is located in the projection area of the equal-shaped section in the direction perpendicular to the chassis.
2. A tapered centrifugal impeller according to claim 1, wherein: the front and the back of the blade are cambered surfaces which are bent towards the same side, the front profile of the deformation section is superposed with the front profile of the equal-shape section, the bottom of the deformation section is superposed with the top of the equal-shape section and is connected with the top of the equal-shape section, and the back of the deformation section is gradually narrowed towards one side of the front.
3. A tapered centrifugal impeller according to claim 2, wherein: the thickness of the thinnest part of the top of the deformation section is LA1, and the maximum thickness is LA 2; the thinnest part of the equal-shaped section has the thickness of LB1, and the maximum thickness is LB2, wherein 0 < LA2-LA1 < (LB2-LB 1)/2.
4. A tapered centrifugal impeller according to claim 3, wherein: the thickness LA1 at the thinnest point of the top of the deformation section ranges from 0.6mm to 1 mm.
5. A tapered centrifugal impeller according to claim 1, wherein: the height of the equal-shaped section is H1, the total height of the blade is H, and H1 is not less than 1/3H and not more than 3/4H.
6. A tapered centrifugal impeller according to claim 1, wherein: the lateral wall of rotation axis is equipped with a plurality of strengthening ribs, the chassis is connected to the one end of strengthening rib, the other end is followed the axial extension of rotation axis, and is a plurality of the strengthening rib is around the rotation axis equidistance range.
7. The tapered centrifugal impeller of claim 6, wherein: the bottom of the reinforcing rib is connected with the chassis, and the width of the bottom of the reinforcing rib is larger than that of the top of the reinforcing rib.
8. A tapered centrifugal impeller according to claim 1, wherein: the impeller is made of plastic and is integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210080686.4A CN114439771A (en) | 2022-01-24 | 2022-01-24 | Become inclined formula centrifugal impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210080686.4A CN114439771A (en) | 2022-01-24 | 2022-01-24 | Become inclined formula centrifugal impeller |
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| Publication Number | Publication Date |
|---|---|
| CN114439771A true CN114439771A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210080686.4A Pending CN114439771A (en) | 2022-01-24 | 2022-01-24 | Become inclined formula centrifugal impeller |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11166498A (en) * | 1997-12-02 | 1999-06-22 | Mitsubishi Heavy Ind Ltd | Multi-vane blower |
| US20110299987A1 (en) * | 2009-02-19 | 2011-12-08 | Turbomeca | Erosion indicator for a compressor wheel |
| CN207004918U (en) * | 2017-07-05 | 2018-02-13 | 广东顺威精密塑料股份有限公司 | A kind of centrifugal wind wheel that can improve flow field |
| CN207920910U (en) * | 2017-02-17 | 2018-09-28 | 日本电产株式会社 | Air-supply arrangement |
| CN209761851U (en) * | 2018-05-18 | 2019-12-10 | 广东美的制冷设备有限公司 | Wind wheel and blade thereof |
| CN211623815U (en) * | 2020-01-16 | 2020-10-02 | 佛山市顺德区涵一电器配件有限公司 | Air exhaust centrifugal impeller |
| CN212297019U (en) * | 2020-08-20 | 2021-01-05 | 奇鋐科技股份有限公司 | Centrifugal fan blade structure |
| CN213655240U (en) * | 2020-10-09 | 2021-07-09 | 嘉兴普洛瓦电器有限公司 | Bidirectional multi-wing centrifugal fan impeller |
| CN113266592A (en) * | 2021-07-06 | 2021-08-17 | 杭州老板电器股份有限公司 | Blade, impeller and fan |
-
2022
- 2022-01-24 CN CN202210080686.4A patent/CN114439771A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11166498A (en) * | 1997-12-02 | 1999-06-22 | Mitsubishi Heavy Ind Ltd | Multi-vane blower |
| US20110299987A1 (en) * | 2009-02-19 | 2011-12-08 | Turbomeca | Erosion indicator for a compressor wheel |
| CN207920910U (en) * | 2017-02-17 | 2018-09-28 | 日本电产株式会社 | Air-supply arrangement |
| CN207004918U (en) * | 2017-07-05 | 2018-02-13 | 广东顺威精密塑料股份有限公司 | A kind of centrifugal wind wheel that can improve flow field |
| CN209761851U (en) * | 2018-05-18 | 2019-12-10 | 广东美的制冷设备有限公司 | Wind wheel and blade thereof |
| CN211623815U (en) * | 2020-01-16 | 2020-10-02 | 佛山市顺德区涵一电器配件有限公司 | Air exhaust centrifugal impeller |
| CN212297019U (en) * | 2020-08-20 | 2021-01-05 | 奇鋐科技股份有限公司 | Centrifugal fan blade structure |
| CN213655240U (en) * | 2020-10-09 | 2021-07-09 | 嘉兴普洛瓦电器有限公司 | Bidirectional multi-wing centrifugal fan impeller |
| CN113266592A (en) * | 2021-07-06 | 2021-08-17 | 杭州老板电器股份有限公司 | Blade, impeller and fan |
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