CN203453115U - Backward centrifugal wind wheel - Google Patents

Backward centrifugal wind wheel Download PDF

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Publication number
CN203453115U
CN203453115U CN201320511026.3U CN201320511026U CN203453115U CN 203453115 U CN203453115 U CN 203453115U CN 201320511026 U CN201320511026 U CN 201320511026U CN 203453115 U CN203453115 U CN 203453115U
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CN
China
Prior art keywords
wind wheel
small leaf
large blade
blade
centrifugal 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.)
Expired - Lifetime
Application number
CN201320511026.3U
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Chinese (zh)
Inventor
马丽华
李跃飞
韦福权
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Guangdong Midea HVAC Equipment Co Ltd
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Guangdong Midea HVAC Equipment Co Ltd
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Priority to CN201320511026.3U priority Critical patent/CN203453115U/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30Vanes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers

Abstract

The utility model is suitable for the technical field of centrifugal wind wheel structures, and provides a backward centrifugal wind wheel. The backward centrifugal wind wheel comprises a front disc, a back disc and a plurality of blade groups arranged between the front disc and the back disc, wherein the blade groups are uniformly distributed between the front disc and the back disc along a circumferential direction, and each of the blade groups comprises at least one big blade and at least one small blade. According to the backward centrifugal wind wheel, the blades are configured to the small blades and the big blades with the different shapes and sizes, so that a fluid channel at the front edges of the blades is wider, the flow choking on an inlet of the fluid channel can be effectively inhibited, through setting the small blades, the back fluid channel becomes narrow, the fluid is accelerated, and the kinetic energy of the fluid on a suction surface is effectively increased through the accelerated fluid, so that gathering of the low-energy fluid is effectively inhibited, and increase of the thickness of a boundary layer is stopped, thus the airflow separation phenomenon on the suction surface of the blades can be reduced, and the purposes of reducing the fluid flow loss and the pneumatic noise of the wind wheel are finally realized.

Description

Backward centrifugal wind wheel
Technical field
The utility model belongs to centrifugal wind wheel technical field of structures, relates in particular to a kind of backward centrifugal wind wheel that is applicable to indoor apparatus of air conditioner group.
Background technique
Centrifugal wind wheel can be divided into forward centrifugal wind wheel, radially centrifugal wind wheel and three kinds of different forms of backward centrifugal wind wheel according to the difference of blade outlet angle, wherein, the blade outlet angle of forward centrifugal wind wheel is greater than 90, and blade to curve direction identical with the sense of rotation of wind wheel; Radially the blade outlet angle of centrifugal wind wheel equals 90, and the trailing edge of blade is installed along the radial direction of wind wheel; The blade outlet angle of backward centrifugal wind wheel is less than 90, and blade to curve direction contrary with the sense of rotation of wind wheel.Backward centrifugal wind wheel is widely used on indoor apparatus of air conditioner because its efficiency is high.
Backward centrifugal wind wheel generally comprise shroud, hub disk and be located at described shroud and described hub disk between blade, in prior art, the size shape of each blade on same backward centrifugal wind wheel is all identical, the design parameters such as chord length, height and setting angle that are each blade are all identical, and this blade structure design course of working is simpler.But, this blade structure Shortcomings part still in concrete application, be embodied in: in wind wheel operation process, easily in the ventilation flue inlet being formed by blade, there is air-flow blocking phenomenon on the one hand, low energy fluid is easily piled up on the suction surface of blade on the other hand, and on blade suction surface, form larger-size whirlpool, finally make near the suction surface place of fluid blade exit that flow separation phenomenon occurs, thereby caused wind wheel to produce in the running larger aerodynamic noise, and caused larger energy loss, and then the working efficiency of wind wheel and the overall performance of indoor apparatus of air conditioner have been had a strong impact on.
Model utility content
The purpose of this utility model is to provide a kind of backward centrifugal wind wheel, the technical problem that when it is intended to solve existing backward centrifugal wind wheel running, aerodynamic noise is large, energy loss is large.
The utility model is achieved in that a kind of backward centrifugal wind wheel, comprise shroud, hub disk and be located at described shroud and described hub disk between some vane group, described some vane group are uniformly distributed along the circumferencial direction of described shroud and hub disk, and described vane group comprises at least one large blade and at least one small leaf.
Preferably, the chord length ratio of the chord length of described small leaf and described large blade is between 0~0.5.
Preferably, the height ratio of described small leaf along the height of this wind wheel axis direction and described large blade along this wind wheel axis direction is between 0~1.
Particularly, described hub disk comprises chassis portion in the form of annular discs, described small leaf has the first trailing edge near described chassis portion outer rim, described large blade has the second trailing edge near described chassis portion outer rim, and described the first trailing edge is more than or equal to 0 and be less than 0.4 to the radial distance of described the second trailing edge and described chassis portion external diameter ratio.
Particularly, a described vane group comprises a described large blade and a described small leaf, and described large blade and described small leaf described in each in vane group arrange relative identical.
Or a described vane group comprises a described small leaf and at least two described large blades, and described in each, described large blade in vane group is all arranged at the same side of a described small leaf.
Or a described vane group comprises a described large blade and at least two described small leaf, and described in each, described small leaf in vane group is all arranged at the same side of a described large blade.
Preferably, described in each, the chord length of small leaf is all identical or have at least the chord length of two described small leaf different, and described in each, the chord length of large blade is all identical.
Preferably, described in each, the height of small leaf is all identical or have at least the height of two described small leaf different, and described in each, the height of large blade is all identical.
Preferably, all described small leaf are identical or not identical with the setting angle of described large blade on described hub disk.
The backward centrifugal wind wheel that the utility model provides, by blade, be set to small leaf and the large blade that shape, size are different, like this, make the fluid passage intake grill at blade inlet edge place wider, be beneficial to more fluid and enter in fluid passage, thereby effectively the air-flow at suppression fluid passage intake grill place stops up; Simultaneously, the exhaust outlet place of fluid passage narrows down, can make fluid accelerate, the fluid accelerating can effectively increase the kinetic energy of blade suction surface fluid, thereby effectively suppress the gathering of low energy fluid, suppress the growth of boundary layer thickness, and then reduce the flow separation phenomenon at blade suction surface place, finally reach the object that reduces fluid flow losses and reduce wind wheel aerodynamic noise.Meanwhile, the material consumption of the large blade of ratio of material dosage of small leaf is few, therefore it has effectively alleviated the overall weight of wind wheel, thereby has reduced the load of motor, and then has improved the working efficiency of wind wheel, and improved the overall performance of indoor apparatus of air conditioner.
Accompanying drawing explanation
Fig. 1 is the perspective view of the backward centrifugal wind wheel that provides of the utility model embodiment;
Fig. 2 is the cross-sectional view of the backward centrifugal wind wheel that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As depicted in figs. 1 and 2, the backward centrifugal wind wheel that the utility model embodiment provides, comprise shroud 1, hub disk 2 and be located at shroud 1 and hub disk 2 between some vane group 3, the setting of shroud 1 and hub disk 2, on the one hand can be used for supporting stator blade group 3, can form fluid passage with together with blade in vane group 3 on the other hand.Some vane group 3 are along the circumferential direction uniformly distributed between shroud 1 and hub disk 2, and vane group 3 comprises at least one small leaf 32 and at least one large blade 31, and small leaf 32 and large blade 31.The relative position that arranges of the small leaf 32 in a vane group 3 and large blade 31 magnitude settings and small leaf 32 and large blade 31 is mainly in order to guarantee small leaf 32 and large blade 31 being uniformly distributed between shroud 1 and hub disk 2.Small leaf 32 and the greatly mode that is uniformly distributed of blade 31 herein, can be that small leaf 32 and large blade 31 are alternately uniformly distributed in a circumferential direction, be to be only provided with a large blade 31 between any two adjacent small leaf 32, and be also only provided with a small leaf 32 between any two adjacent large blades 31; Or, can be that small leaf 32 is uniformly distributed in the mode at interval of two or more large blades 31, be to be provided with at least two large blades 31 between any two adjacent small leaf 32, and large blade 31 quantity that arrange between any two adjacent small leaf 32 are identical; Or, can be that large blade 31 is uniformly distributed in the mode at interval of two or more small leaf 32, be to be provided with at least two small leaf 32 between any two adjacent large blades 31, and small leaf 32 quantity that arrange between any two adjacent large blades 31 are identical.The intermediate portion of shroud 1 offers intake grill (not indicating in figure), between arbitrary neighborhood two blades and shroud 1, hub disk 2, can form the fluid passage (not indicating in figure) of wind wheel, one end that fluid passage extends hub disk 2 edges is the exhaust outlet (not indicating in figure) of wind wheel, during wind wheel running, the fluids such as air enter in wind wheel from intake grill, and outside exhaust outlet flows out wind wheel.The side that on small leaf 32, pressurized is larger is the first pressure side 323, and the side that pressurized is less is the first suction surface 324; On large blade 31, the larger side of pressurized is the second pressure side 313, and the side that pressurized is less is the second suction surface 314.The utility model, by blade 3 being set to small leaf 32 and the large blade 31 that shape, size are different, like this, the fluid passage intake grill consisting of large blade 31 and small leaf 32 is wider, be beneficial to more fluid and enter in fluid passage, thereby effectively the air-flow at suppression fluid passage intake grill place stops up; The fluid passage exhaust outlet consisting of large blade 31 and small leaf 32 is on the other hand narrower, being beneficial to fluid accelerates, the fluid accelerating can effectively increase the kinetic energy of small leaf 32 first suction surface 324 fluids, thereby effectively suppress low energy fluid in the gathering of small leaf 32 first suction surfaces 324, suppress the growth of boundary layer thickness, and then the flow separation phenomenon of minimizing blade suction surface, finally reach the object that reduces fluid flow losses and reduce wind wheel aerodynamic noise.Meanwhile, because the material consumption of the large blade 31 of ratio of material dosage of small leaf 32 is few, therefore, small leaf 32 the overall weight that has effectively alleviated wind wheel is set, thereby reduced the load of motor, and then improved the working efficiency of wind wheel, and improved the overall performance of indoor apparatus of air conditioner.In concrete application, the quantity of small leaf 32 and large blade 31 can require according to concrete air quantity demand, wind wheel balance, wind wheel noise requires and design processing cost etc. is optimized design.
Particularly, as depicted in figs. 1 and 2, shroud 1 comprises vertical tube part 11 and arc ring portion 12, and the hollow space of vertical tube part 11 is intake grill, and during wind wheel running, the fluids such as air enter in wind wheel and are rotated from intake grill.Hub disk 2 comprises chassis portion 21 and is located at the hub portion 22 in chassis portion 21, and hub portion 22 is provided with the axis hole 221 with motor output shaft adaptation.In the chassis portion 21 of the top of large blade 31 and the arc ring portion 12 that bottom is connected to respectively shroud 1 and hub disk 2, the bottom of small leaf 32 is connected in the chassis portion 21 of hub disk 2.In specific design, shroud 1, hub disk 2, large blade 31 and small leaf 32 can adopt plastics to pass through the one-body molded design of mould and process.During concrete installation, by being connected of hub portion 22 upper shaft holes 221 and motor (not shown) output shaft, backward centrifugal wind wheel can be set on motor output shaft, then by can be by the rear output shaft that is tightly fixed on motor to centrifugal wind wheel casing pressure at pressed components such as motor output shaft end mounting nuts or glands, like this,, realized being fixedly connected with between backward centrifugal wind wheel and motor.
Preferably, the ratio t of the chord length of the chord length of small leaf 32 and large blade 31 between 0~0.5, i.e. 0<t<0.5.Particularly, small leaf 32 has first leading edge 321 at close hub disk 2 centers and first trailing edge 322 at close hub disk 2 edges, the first leading edge 321 is the inside edge of close intake grill on small leaf 32, the first trailing edge 322 is the outer ledge of close exhaust outlet on small leaf 32, and the crow flight distance between the first leading edge 321 and the first trailing edge 322 is the chord length of small leaf 32; Large blade 31 has second leading edge 311 at close hub disk 2 centers and second trailing edge 312 at close hub disk 2 edges, the second leading edge 311 is the inside edge of close intake grill on large blade 31, the second trailing edge 312 is the outer ledge of close exhaust outlet on large blade 31, and the crow flight distance between the second leading edge 311 and the second trailing edge 312 is the chord length of large blade 31.The present embodiment, the chord length of small leaf 32 is set to be less than 0.5 with the ratio of the chord length of large blade 31, be that the chord length of small leaf 32 is less than half of the chord length of large blade 31, like this, can make on the one hand the fluid passage intake grill that formed by large blade 31 and small leaf 32 wider, be beneficial to more fluid and enter in fluid passage, thereby effectively the air-flow at suppression fluid passage intake grill place stops up; Can make on the other hand the fluid passage exhaust outlet that formed by large blade 31 and small leaf 32 narrower, being beneficial to fluid accelerates, the fluid accelerating can effectively increase the kinetic energy of small leaf 32 first suction surface 324 fluids, thereby effectively suppress low energy fluid in the gathering of small leaf 32 first suction surfaces 324, suppress the growth of boundary layer thickness, and then the flow separation phenomenon of minimizing small leaf 32 first suction surfaces 324, finally effectively guaranteed the effect that reduces fluid flow losses and reduce wind wheel aerodynamic noise.
Preferably, the chord length of each small leaf 32 is all identical or have at least the chord length of two small leaf 32 different, and the chord length of each large blade 31 is all identical.More preferably, the chord length of each small leaf 32 is all identical, the chord length of each large blade 31 is all identical, like this, can guarantee whole wind wheel balance and meet under the prerequisite that reduces noise requirement, can reduce again the design processed complex degree of small leaf 32 and large blade 31, thereby effectively reduce the design processing cost of backward centrifugal wind wheel.Certainly, in concrete application, the chord length of each small leaf 32 can be not identical yet, and the chord length of each large blade 31 can be not identical yet, as long as guarantee the whole machine balancing of wind wheel.
Preferably, the ratio delta of small leaf 32 along the height of this wind wheel axis direction and large blade 31 along the height of this wind wheel axis direction between 0~1, i.e. 0< δ <1.Small leaf 32 refers to that along the height of this wind wheel axis direction the bottom of small leaf 32 is to the crow flight distance at top, and large blade 31 refers to that along the height of this wind wheel axis direction the bottom of large blade 31 is to the crow flight distance at top.Wherein, in the bottom of small leaf 32 and the large equal butt in bottom of blade 31 and the chassis portion 21 of hub disk 2, the top of large blade 31 is connected in the arc ring portion 12 of shroud 1.The present embodiment, the height of small leaf 32 is less than the set-up mode of the height of large blade 31, can make to there is certain gap between the top of small leaf 32 and shroud 1 bottom, like this, in wind wheel operation process, can make the part high-energy fluid of small leaf 32 first pressure side 323 sides flow to the first suction surface 324 sides from the gap between small leaf 32 tops and shroud 1 bottom, thereby can effectively increase the kinetic energy of the first suction surface 324 side liquids, and then can effectively suppress low energy fluid in the accumulation of small leaf 32 first suction surface 324 sides, reach the object that effective inhibition small leaf 32 first suction surface 324 side low energy fluid layer thicknesses increase, and then reduced or eliminated the flow separation phenomenon at small leaf 32 first suction surface 324 places, finally reach the object that reduces fluid flow losses and reduce wind wheel aerodynamic noise.
Preferably, the height of each small leaf 32 is all identical or have at least the height of two small leaf 32 different, and the height of each large blade 31 is all identical.More preferably, the height of each small leaf 32 is all identical, and the height of each large blade 31 is all identical.Like this, can guaranteeing whole wind wheel balance and meeting under the prerequisite that reduces noise requirement, can reduce again the design processed complex degree of small leaf 32 and large blade 31, thereby effectively reduce the design processing cost of backward centrifugal wind wheel.Certainly, in concrete application, the height of each small leaf 32 can be not identical yet, and the height of each large blade 31 can be not identical yet, as long as guarantee the whole machine balancing of wind wheel.
Particularly, the chassis portion 21 of hub disk 2 is in the form of annular discs, the first trailing edge 322 of small leaf 32 is more than or equal to 0 and be less than 0.4 to the radial distance of the second trailing edge 312 of large blade 31 and the 21 external diameter ratio ε of chassis portion, i.e. 0≤ε <0.4, like this, can make the first trailing edge 322 of small leaf 32 less with the radial distance of the second trailing edge 312 on wind wheel of large blade 31, like this, be beneficial to the flow separation phenomenon that reduces or eliminates wind wheel exhaust outlet place on the one hand, be beneficial on the other hand and reduce the phenomenon that fluid stops up at wind wheel intake grill place generation air-flow.
Preferably, all small leaf 32 are all identical with the setting angle of large blade 31 on hub disk 2.Like this, can guaranteeing whole wind wheel balance and meeting under the prerequisite that reduces noise requirement, can reduce again the design processed complex degree of small leaf 32 and large blade 31, thereby effectively reduce the design processing cost of backward centrifugal wind wheel.Certainly, in concrete application, the setting angle of each small leaf 32 can be not identical yet, and the setting angle of each large blade 31 can be not identical yet, as long as guarantee the whole machine balancing of wind wheel.
Particularly, the relative position that arranges of the small leaf 32 in a vane group 3 and large blade 31 magnitude settings and small leaf 32 and large blade 31, be mainly in order to guarantee small leaf 32 and large blade 31 being uniformly distributed between shroud 1 and hub disk 2, and then guarantee the whole machine balancing of wind wheel.Relative position is set can adopts following three specific embodiments of small leaf 32, large blade 31 in small leaf in a vane group 3 32 and large blade 31 magnitude settings and vane group 3:
One: one vane group 3 of embodiment only includes a large blade 31 and a small leaf 32, and large blade 31 with small leaf 32 in each vane group 3 that relative position is set is identical.Like this, small leaf 32 quantity that arrange between shroud 1 and hub disk 2 are identical with large blade 31 quantity, and between any two adjacent small leaf 32, a large blade 31 is only set, between any two adjacent large blades 31, be also only provided with a small leaf 32, small leaf 32 and large blade 31 are alternately uniformly distributed in a circumferential direction.The present embodiment, can guarantee under the prerequisite of whole wind wheel balance, can reduce again the design processed complex degree of wind wheel, thereby effectively reduces the design processing cost of wind wheel.
Two: one vane group 3 of embodiment comprise a small leaf 32 and at least two large blades 31, and each the large blade 31 in each vane group 3 is all arranged at the same side of a small leaf 32.Like this, small leaf 32 quantity that arrange between shroud 1 and hub disk 2 are less than large blade 31 quantity, large blade 31 quantity that arrange between any two adjacent small leaf 32 are identical and be at least two, be that small leaf 32 is uniformly distributed in the mode at interval of two or more large blades 31, this distribution mode, also can guarantee the balance of whole wind wheel.Compare with embodiment one, the wind wheel material consumption of the present embodiment has reduced, and the overall weight of wind wheel has alleviated, but the design processed complex degree of its wind wheel is larger.
As three, one vane group 3 of embodiment of the present utility model, comprise a large blade 31 and at least two small leaf 32, and each small leaf 32 in each vane group 3 is all arranged at the same side of a large blade 31.Like this, the quantity of the small leaf 32 arranging between shroud 1 and hub disk 2 is more than the quantity of large blade 31, small leaf 32 quantity that arrange between any two adjacent large blades 31 are identical and be at least two, be that large blade 31 is uniformly distributed in the mode at interval of two or more small leaf 32, this distribution mode, also can guarantee the balance of whole wind wheel.Compare with embodiment one, embodiment two, embodiment three wind wheel material consumption has increased, and the overall weight of wind wheel has also increased, and the design processed complex degree of its wind wheel is also larger than the design processed complex degree of embodiment one wind wheel; Therefore in concrete application, small leaf 32 and the be uniformly distributed mode of large blade 31 between shroud 1 and hub disk 2 preferably adopt the distribution mode of above-described embodiment one.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace or improvement etc., within all should being included in protection domain of the present utility model.

Claims (10)

1. a backward centrifugal wind wheel, comprise shroud, hub disk and be located at described shroud and described hub disk between some vane group, it is characterized in that: described some vane group are uniformly distributed along the circumferencial direction of described shroud and hub disk, and described vane group comprises at least one large blade and at least one small leaf.
2. backward centrifugal wind wheel as claimed in claim 1, is characterized in that: the chord length ratio of the chord length of described small leaf and described large blade is between 0~0.5.
3. backward centrifugal wind wheel as claimed in claim 1, is characterized in that: the height ratio of described small leaf along the height of this wind wheel axis direction and described large blade along this wind wheel axis direction is between 0~1.
4. backward centrifugal wind wheel as claimed in claim 1, it is characterized in that: described hub disk comprises chassis portion in the form of annular discs, described small leaf has the first trailing edge near described chassis portion outer rim, described large blade has the second trailing edge near described chassis portion outer rim, and described the first trailing edge is more than or equal to 0 and be less than 0.4 to the radial distance of described the second trailing edge and described chassis portion external diameter ratio.
5. the backward centrifugal wind wheel as described in claim 1 to 4 any one, is characterized in that: a described vane group comprises a described large blade and a described small leaf, and described large blade and described small leaf described in each in vane group arrange relative identical.
6. the backward centrifugal wind wheel as described in claim 1 to 4 any one, it is characterized in that: a described vane group comprises a described small leaf and at least two described large blades, and described in each, described large blade in vane group is all arranged at the same side of a described small leaf.
7. the backward centrifugal wind wheel as described in claim 1 to 4 any one, it is characterized in that: a described vane group comprises a described large blade and at least two described small leaf, and described in each, described small leaf in vane group is all arranged at the same side of a described large blade.
8. backward centrifugal wind wheel as claimed in claim 1 or 2, is characterized in that: described in each, the chord length of small leaf is all identical or have at least the chord length of two described small leaf different, and described in each, the chord length of large blade is all identical.
9. the backward centrifugal wind wheel as described in claim 1 or 3, is characterized in that: described in each, the height of small leaf is all identical or have at least the height of two described small leaf different, and described in each, the height of large blade is all identical.
10. the backward centrifugal wind wheel as described in claim 1 to 4 any one, is characterized in that: all described small leaf are identical or not identical with the setting angle of described large blade on described hub disk.
CN201320511026.3U 2013-08-20 2013-08-20 Backward centrifugal wind wheel Expired - Lifetime CN203453115U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105352033A (en) * 2015-07-29 2016-02-24 深圳奥郎格环保有限公司 Air purifier
CN106438466A (en) * 2016-11-03 2017-02-22 海信(山东)空调有限公司 Centrifugal fan and air-conditioner indoor unit
CN106837866A (en) * 2016-09-12 2017-06-13 东莞市卓奇电子科技有限公司 Noise-and-vibration-reduction impeller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105352033A (en) * 2015-07-29 2016-02-24 深圳奥郎格环保有限公司 Air purifier
CN106837866A (en) * 2016-09-12 2017-06-13 东莞市卓奇电子科技有限公司 Noise-and-vibration-reduction impeller
CN106438466A (en) * 2016-11-03 2017-02-22 海信(山东)空调有限公司 Centrifugal fan and air-conditioner indoor unit

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Granted publication date: 20140226