CN206626015U - Wind wheel and household electrical appliance - Google Patents

Wind wheel and household electrical appliance Download PDF

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Publication number
CN206626015U
CN206626015U CN201621093757.0U CN201621093757U CN206626015U CN 206626015 U CN206626015 U CN 206626015U CN 201621093757 U CN201621093757 U CN 201621093757U CN 206626015 U CN206626015 U CN 206626015U
Authority
CN
China
Prior art keywords
blade
wheel
wind wheel
blades
wind
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn - After Issue
Application number
CN201621093757.0U
Other languages
Chinese (zh)
Inventor
滕国华
叶似锦
熊亮
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.)
Midea Group Co Ltd
GD Midea Environment Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Environment Appliances Manufacturing 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.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, GD Midea Environment Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Priority to PCT/CN2016/105079 priority Critical patent/WO2017128803A1/en
Priority to JP2018539071A priority patent/JP2019504958A/en
Application granted granted Critical
Publication of CN206626015U publication Critical patent/CN206626015U/en
Priority to JP2020217647A priority patent/JP2021060040A/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/327—Rotors specially for elastic fluids for axial flow pumps for axial flow fans with non identical blades

Abstract

The utility model discloses a kind of wind wheel and household electrical appliance.Wind wheel includes first wheel, the second wheel hub, multiple first blades and multiple second blades.First wheel is coaxially disposed with the second wheel hub.Multiple first blades are fixedly connected with first wheel and the second wheel hub.Multiple first spacing with blades arrangements.Multiple second blades are fixed on the lateral surface of the second wheel hub.Multiple second spacing with blades arrangements.The gross area of multiple first blades is more than the gross area of multiple second blades.In above-mentioned wind wheel, because the gross area of the first blade of wind wheel is more than the gross area of blade, first blade produces large effect to overall air-flow caused by wind wheel, the first blade is produced with the second blade after air-flow converges can spread, so as to increase the blowing area of wind wheel, the demand of user is met.

Description

Wind wheel and household electrical appliance
Technical field
It the utility model is related to household appliance technical field, more particularly to a kind of wind wheel and a kind of household electrical appliance.
Background technology
The wind wheel of existing double-deck blade structure can ensure wind concentration, increase the blowing distance of wind wheel.It is however, existing The internal layer blade of the wind wheel for the double-deck blade structure having is smaller, and the influence to overall air-flow is little, makes the blowing area mistake of wind wheel It is small, user's request can not be met.
Utility model content
The utility model is intended at least solve one of technical problem present in prior art.Therefore, the utility model carries For a kind of wind wheel and a kind of household electrical appliance.
The wind wheel of the utility model embodiment includes first wheel, the second wheel hub, multiple first blades and multiple second Blade.The first wheel is coaxially disposed with second wheel hub.The multiple first blade is fixedly connected with the first wheel With second wheel hub.The multiple first spacing with blades arrangement.The multiple second blade is fixed on second wheel hub Lateral surface.The multiple second spacing with blades arrangement.The gross area of the multiple first blade is more than the multiple second blade The gross area.
In above-mentioned wind wheel, because the gross area of the first blade is more than the gross area of the second blade, the first blade is to wind wheel Overall air-flow produces large effect, and the first blade is produced with the second blade after air-flow converges can spread, so as to increase The blowing area of wind wheel, meet the demand of user.
In some embodiments, the angle of attack of first blade is more than the angle of attack of second blade.
In some embodiments, the multiple first blade radial interval row centered on the first wheel Cloth.
In some embodiments, the multiple second blade radial interval row centered on the first wheel Cloth.
In some embodiments, circumferencial direction of first blade along the first wheel is uniformly distributed.
In some embodiments, circumferencial direction of second blade along second wheel hub is uniformly distributed.
In some embodiments, first blade is airfoil fan.
In some embodiments, second blade is airfoil fan.
In some embodiments, between the gross area of the multiple first blade and adjacent two first blades The ratio of area sum in gap be more than 1 and less than 3.
In some embodiments, between the gross area of the multiple second blade and adjacent two second blades The ratio of area sum in gap be more than 1 and less than 4.
In some embodiments, between the gross area of the multiple first blade and adjacent two first blades Gap area sum ratio be less than the multiple second blade the gross area and adjacent two second blades it Between gap area sum ratio.
In some embodiments, the wind wheel is formed in one structure.
The household electrical appliance of the utility model embodiment include above-mentioned wind wheel.
Due to the above-mentioned wind wheel of the application in domestic appliances of present embodiment so that household electrical appliance blowing during use Wind area is bigger, can meet the needs of user.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
In description of the of the present utility model above-mentioned and/or additional aspect and advantage from combination accompanying drawings below to embodiment It will be apparent and be readily appreciated that, wherein：
Fig. 1 is the floor map of the wind wheel of the utility model embodiment.
Fig. 2 is the operation principle schematic diagram of the wind wheel of the utility model embodiment.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein Same or similar label represents same or similar element or the element with same or like function from beginning to end.Lead to below It is exemplary to cross the embodiment being described with reference to the drawings, and is only used for explaining the utility model, and it is not intended that to this practicality New limitation.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", The orientation or position relationship of the instructions such as " clockwise ", " counterclockwise " be based on orientation shown in the drawings or position relationship, be only for Be easy to describe the utility model and simplify to describe, rather than instruction or imply signified device or element must have it is specific Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " first ", " second " is only used for describing purpose, and it is not intended that indicating or implying relative importance or imply the technology indicated by indicating The quantity of feature.Thus, " first " is defined, the feature of " second " can be expressed or implicitly include one or more The feature.In description of the present utility model, " multiple " are meant that two or more, unless otherwise clearly specific Limit.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly Connection；It can be mechanical connection or electrical connection or can mutually communicate；Can be joined directly together, can also be in Between medium be indirectly connected, can be connection or the interaction relationship of two elements of two element internals.For this area For those of ordinary skill, concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or it " under " can directly be contacted including the first and second features, it is not directly to contact but lead to that can also include the first and second features The other characterisation contact crossed between them.Moreover, fisrt feature second feature " on ", " top " and " above " include the One feature is directly over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.First is special Sign second feature " under ", " lower section " and " below " including fisrt feature directly over second feature and oblique upper, or only Represent that fisrt feature level height is less than second feature.
Following disclosure provides many different embodiments or example is used for realizing different structure of the present utility model. In order to simplify disclosure of the present utility model, hereinafter the part and setting of specific examples are described.Certainly, they are only Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals And/or reference letter, this repetition are for purposes of simplicity and clarity, itself not indicate discussed various embodiments And/or the relation between setting.In addition, various specific techniques and the example of material that the utility model provides, but this Field those of ordinary skill can be appreciated that the application of other techniques and/or the use of other materials.
Refer to Fig. 1 and Fig. 2, the wind wheel 100 of the utility model embodiment include first wheel 10, the second wheel hub 20, Multiple first blades 30 and multiple second blades 40.
First wheel 10 is coaxially disposed with the second wheel hub 20.Multiple first blades 30 are fixedly connected with first wheel 10 and second Wheel hub 20.Multiple first blades 30 are intervally arranged.Multiple second blades 40 are fixed on the lateral surface 22 of the second wheel hub 20.Multiple Two blades 40 are intervally arranged.The gross area Σ S1 of multiple first blades 30 are more than the gross area Σ S2 of multiple second blades 40.
In above-mentioned wind wheel 100, because the gross area of the first blade 30 of wind wheel 100 is more than the gross area of the second blade 40, First blade 30 produces large effect to overall air-flow caused by wind wheel 100, the first blade 30 is produced with the second blade 40 Air-flow can spread after converging, and so as to increase the blowing area of wind wheel 100, meet the demand of user.
In addition, air-flow caused by the first blade 30 and the second blade 40 converges interaction, the centrifugal force of wind wheel 100 can be reduced Caused eddy current effect, the wind after diffusion is more nearly natural wind, improve Consumer's Experience.
Inventor will detect wind wheel 100 and existing wind wheel according to the utility model embodiment under identical conditions Parameter be compared, wherein being compared to obtain table 1 to air quantity and noise when rotating speed is close：
Table 1
Noise is compared when air quantity is identical to obtain table 2：
Table 2
As can be seen from Table 1, when rotating speed is close, the air quantity of the wind wheel 100 of present embodiment is significantly greater than existing wind The air quantity of wheel, but noise difference is smaller, the influence to user is little.
As can be seen from Table 2, when air quantity is identical, the noise of the wind wheel 100 of present embodiment is significantly lower than existing wind The noise of wheel, rotating speed and power are also significantly lower than existing wind wheel, therefore can save electricity.
It should be noted that in present embodiment, it can be understood as, first wheel 10 is inner wheel hub, and the second wheel hub 20 is Outer wheel hub.First blade 30 is intra vane, and the second blade 40 is outer leafs.
Center of rotation of the first wheel 10 compared with the second wheel hub 20 close to wind wheel 100, the first blade 30 lean on compared with the second blade 40 The center of rotation of nearly wind wheel 100.
Specifically, the inner end edge 32 of multiple first blades 30 is connected on the lateral wall 12 of first wheel 10.Multiple The outer end edges 34 of one blade 30 are connected on the medial surface 24 of the second wheel hub 20.
The wheel hub 20 of first wheel 10 and second is directly connected by the first blade 30, reduces the complicated of wind wheel 100 Degree, wind wheel 100 is set to be more prone to manufacture.
In present embodiment, multiple first blades 30 are radial centered on first wheel 10 to be intervally arranged.
In this way, being advantageous to the first blade 30 connection wheel hub 20 of first wheel 10 and second, the intensity of wind wheel 100 can be improved.
In present embodiment, multiple second blades 40 are radial centered on first wheel 10 to be intervally arranged.
The incoming air area of wind wheel 100 can so be increased, be advantageous to increase the air output of wind wheel 100.
In present embodiment, circumferencial direction of first blade 30 along first wheel 10 is uniformly distributed.
That is, the distance between two the first blades 30 of arbitrary neighborhood in a circumferential direction is equal or any phase Angle between two adjacent the first blades 30 is equal, can so facilitate the manufacture of wind wheel 100, additionally it is possible to the first blade 30 is existed The uniform air-flow of speed is produced on circumferencial direction, ensures that the first blade 30 and the second blade 40 are produced after air-flow converges and can expanded Dissipate, so as to increase the blowing area of wind wheel 100.
In present embodiment, circumferencial direction of second blade 40 along the second wheel hub 20 is uniformly distributed.
In this way, being advantageous to the manufacture of wind wheel 100, and make the caused current density of wind wheel 100 uniform, be advantageous to gas Flowing.
In addition, the circumferencial direction of the first blade 30 and the second blade 40 along wind wheel 100 is uniformly distributed, additionally it is possible to ensures wind Under static state, the mass cg of wind wheel 100 is located in the center of rotation of wind wheel 100 wheel 100.Wind wheel can so be reduced Vibration during 100 rotation, caused noise is rotated so as to reduce wind wheel 100.
Specifically, first wheel 10 offers centre bore 14, and wind wheel 100 can be connected by the rotary shaft of centre bore 14 and motor Connect, motor driving wind wheel 100 rotates.
In present embodiment, the angle of attack of the first blade 30 is more than the angle of attack of the second blade 40.
In this way, wind wheel 100 has preferable aeroperformance, the efficiency of wind wheel 100 is improved, and make the wind of present embodiment Wheel 100 is compared with traditional wind wheel, and under identical rotating speed, air quantity caused by wind wheel 100 is bigger.
In present embodiment, the first blade 30 is airfoil fan.
Because airfoil fan has preferable aeroperformance, each aeroperformance of first blade 30 can be so improved, and And first blade 30 it is larger to the overall airflow influence of wind wheel 100, can so improve the aeroperformance of wind wheel 100, reduce wind The power attenuation of wheel 100, has saved the energy (such as electric energy).
Specifically, the structure all same of multiple first blades 30, that is to say, that the overall structure of each first blade 30 It is identical, it can so facilitate the manufacture of wind wheel 100.
Further, the first blade 30 is the airfoil fan of distortion.Due to the shape of the blade of distortion and the flowing of air-flow Rule is consistent, and can so reduce the loss of gas flowing, improves the efficiency of wind wheel 100.
It is preferred that the second blade 40 is airfoil fan.It so can further improve the aeroperformance of wind wheel 100.
In addition, airfoil fan is for example designed by bionical object of the assistant of flying bird.Specifically, in one example, First blade 30 may be designed as secondary feather shape, and the second blade 40 may be designed as primaries shape, just can so design profile Two layers different of blades, its advantage are：1. the profile of blade uses Bionic Design, make blade that there is good aeroperformance, and Overall appearance after assembling；2. twi-tier blade designs, wind sweeping area can be added, improves air quantity；3. the middle outer wheel hub of twi-tier blade Design, the intensity of blade is improved, extend working life.
In present embodiment, between gross area Σ S1 and adjacent two the first blade 30 of multiple first blades 30 The area sum Σ S1 ' in gap ratio is more than 1 and less than 3.
That is, 1<ΣS1/ΣS1’<3.Obtained according to experiment test, Σ S1/ Σ S1 ' more than 1 and less than 3 this During scope, the first blade 30 has preferable aeroperformance, and the air quantity of wind wheel 100 is larger, and blowing area is larger.
In present embodiment, between gross area Σ S2 and adjacent two the second blade 40 of multiple second blades 40 The area sum Σ S2 ' in gap ratio is more than 1 and less than 4.
That is, 1<ΣS2/ΣS2’<4.Obtained according to experiment test, Σ S2/ Σ S2 ' more than 1 and less than 4 this During scope, can further very high wind wheel 100 aeroperformance so that the blowing amount of wind wheel 100 is larger, and blowing area is more Extensively.
In present embodiment, between gross area Σ S1 and adjacent two the first blade 30 of multiple first blades 30 The area sum Σ S1 ' in gap ratio Σ S1/ Σ S1 ' are less than the gross area Σ S2 of multiple second blades 40 and adjacent two The area sum Σ S2 ' in the gap between the second blade 40 ratio Σ S2/ Σ S2 '.
That is, Σ S1/ Σ S1 '<ΣS2/ΣS2’.It can thus be concluded that circumference of first blade 30 along first wheel 10 Directional spreding is sparse compared with circumferencial direction distribution of second blade 40 along the second wheel hub 20.The air intake of wind wheel 100 can so be ensured Amount is sufficient, meets the demand of the Wind Volume of wind wheel 100.
Specifically, in present embodiment, the quantity of the first blade 30 is 7, and the quantity of the second blade 40 is 9.
In other embodiments, the particular number of the first blade and the second blade can determine according to actual conditions.At this In the other embodiment of sample, it is preferred that can also meet the gross areas of multiple first blades and two adjacent the first blades it Between gap area sum ratio be less than multiple second blades the gross area and adjacent two the second blades between The ratio of the area sum of gap.
It should be noted that between gross area Σ S1 of multiple first blades 30, adjacent two the first blades 30 The area S1 ' of gap, multiple second blades 40 gross area Σ S2 and adjacent two the second blade 40 between gap area S2 ' is that wind wheel 100 carries out the area that measures after forward projection, and wind wheel 100 regards in the view such as Fig. 1 of the forward projection of wind wheel 100 Figure.
Wherein, the area S1 ' in the gap between two adjacent the first blades 30 be the forward projection of wind wheel 100 after, it is adjacent The contour line of two the first blades 30, the contour line of the contour line of first wheel 10 and the second wheel hub 20 figure that surrounds Area.
Such as in Fig. 1, the area for the figure that line segment L1, line segment L2, line segment L3 and line segment L4 are surrounded is adjacent two The area S1 ' in the gap between the first blade 30.
The gross area Σ S1 of multiple first blades 30 are the contour line of each first blade 30 after the forward projection of wind wheel 100 The area S1 sums of the figure surrounded.
The area S2 ' in the gap between two adjacent the second blades 40 is two adjacent after the forward projection of wind wheel 100 Extended line (such as Fig. 1 of the external periphery outline line of the contour line of second blade 40, the contour line of the second wheel hub 20 and the second blade 40 Shown in middle dotted line) area of figure that surrounds.
In present embodiment, the structure it is preferred that wind wheel 100 is formed in one.
Specifically, the material of wind wheel 100 can be plastics, and then the knot to form wind wheel 100 is manufactured by Shooting Technique Structure.
It can so make the processing technology of wind wheel 100 simple, reduce the manufacturing cost of wind wheel 100, first can also be improved The intensity of the blade 40 of blade 30 and second, the first blade 30 and the second blade 40 is set to be not easy to be damaged.
The household electrical appliance of the utility model embodiment include above-mentioned wind wheel 100.
Due to the above-mentioned wind wheel 100 of the application in domestic appliances of present embodiment so that household electrical appliance are in use Blowing area is bigger, can meet the needs of user.
Household electrical appliance are, for example, the household electrical appliance that fan, warmer or air conditioner etc. have wind wheel.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation The description of mode ", " example ", " specific example " or " some examples " etc. means with reference to the embodiment or example description Specific features, structure, material or feature are contained at least one embodiment or example of the present utility model.In this explanation In book, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, the specific spy of description Sign, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
While there has been shown and described that embodiment of the present utility model, one of ordinary skill in the art can manage Solution：A variety of to the progress of these embodiments can change in the case where not departing from principle and objective of the present utility model, change, Replace and modification, the scope of the utility model are limited by claim and its equivalent.

Claims (13)

  1. A kind of 1. wind wheel, it is characterised in that including：
    First wheel；
    The second wheel hub being coaxially disposed with the first wheel；
    It is fixedly connected with multiple first blades of the first wheel and second wheel hub, the multiple first spacing with blades row Cloth；And
    It is fixed on multiple second blades of the lateral surface of second wheel hub, the multiple second spacing with blades arrangement；
    The gross area of the multiple first blade is more than the gross area of the multiple second blade.
  2. 2. wind wheel as claimed in claim 1, it is characterised in that the angle of attack of first blade is more than meeting for second blade Angle.
  3. 3. wind wheel as claimed in claim 1, it is characterised in that the multiple first blade is in centered on the first wheel Radial separation is arranged.
  4. 4. wind wheel as claimed in claim 1, it is characterised in that the multiple second blade is in centered on the first wheel Radial separation is arranged.
  5. 5. wind wheel as claimed in claim 1, it is characterised in that circumferencial direction of first blade along the first wheel is equal Even distribution.
  6. 6. wind wheel as claimed in claim 1, it is characterised in that circumferencial direction of second blade along second wheel hub is equal Even distribution.
  7. 7. wind wheel as claimed in claim 1, it is characterised in that first blade is airfoil fan.
  8. 8. wind wheel as claimed in claim 1, it is characterised in that second blade is airfoil fan.
  9. 9. wind wheel as claimed in claim 1, it is characterised in that the gross area of the multiple first blade and two adjacent institutes The ratio for stating the area sum in the gap between the first blade is more than 1 and less than 3.
  10. 10. wind wheel as claimed in claim 1, it is characterised in that the gross area of the multiple second blade and adjacent two The ratio of the area sum in the gap between second blade is more than 1 and less than 4.
  11. 11. such as the wind wheel any one of claim 1-10, it is characterised in that the gross area of the multiple first blade with The ratio of the area sum in the gap between two adjacent first blades is less than the gross area of the multiple second blade The ratio of the area sum in the gap between two adjacent second blades.
  12. 12. wind wheel as claimed in claim 1, it is characterised in that the wind wheel is formed in one structure.
  13. 13. a kind of household electrical appliance, it is characterised in that including the wind wheel as described in any one of claim 1~12.
CN201621093757.0U 2016-01-27 2016-09-29 Wind wheel and household electrical appliance Withdrawn - After Issue CN206626015U (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2016/105079 WO2017128803A1 (en) 2016-01-27 2016-11-08 Fan wheel, and home appliance
JP2018539071A JP2019504958A (en) 2016-01-27 2016-11-08 Fans and home appliances
JP2020217647A JP2021060040A (en) 2016-01-27 2020-12-25 Fan and consumer electronics

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2016200836249 2016-01-27
CN201620083624 2016-01-27

Publications (1)

Publication Number Publication Date
CN206626015U true CN206626015U (en) 2017-11-10

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CN201621093757.0U Withdrawn - After Issue CN206626015U (en) 2016-01-27 2016-09-29 Wind wheel and household electrical appliance
CN201610865361.1A Active CN106930974B (en) 2016-01-27 2016-09-29 Wind wheel and household appliance

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN201610865361.1A Active CN106930974B (en) 2016-01-27 2016-09-29 Wind wheel and household appliance

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN106930974A (en) * 2016-01-27 2017-07-07 广东美的环境电器制造有限公司 Wind wheel and household electrical appliance
CN110645649A (en) * 2019-09-17 2020-01-03 吴嵘 Air sterilization dust collector

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CN111043063B (en) 2018-10-15 2021-06-18 广东美的白色家电技术创新中心有限公司 Counter-rotating fan
CN110107505B (en) * 2019-06-14 2020-07-03 安徽工业大学 Aircraft supercharging device
CN112503007A (en) * 2019-09-16 2021-03-16 广东美的环境电器制造有限公司 Air supply device and household appliance
CN112503005A (en) * 2019-09-16 2021-03-16 广东美的环境电器制造有限公司 Air supply device and household appliance
CN112012959B (en) * 2020-09-27 2021-12-31 北京航天奥祥通风科技股份有限公司 Axial flow impeller and fan

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CN206626015U (en) * 2016-01-27 2017-11-10 广东美的环境电器制造有限公司 Wind wheel and household electrical appliance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106930974A (en) * 2016-01-27 2017-07-07 广东美的环境电器制造有限公司 Wind wheel and household electrical appliance
CN106930974B (en) * 2016-01-27 2023-02-17 广东美的环境电器制造有限公司 Wind wheel and household appliance
CN110645649A (en) * 2019-09-17 2020-01-03 吴嵘 Air sterilization dust collector

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