CN106989034B - Centrifugal fan and dust collector with same - Google Patents
Centrifugal fan and dust collector with same Download PDFInfo
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- CN106989034B CN106989034B CN201710331122.2A CN201710331122A CN106989034B CN 106989034 B CN106989034 B CN 106989034B CN 201710331122 A CN201710331122 A CN 201710331122A CN 106989034 B CN106989034 B CN 106989034B
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- diffuser
- backward flow
- impeller
- centrifugal fan
- blades
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- 239000000428 dust Substances 0.000 title abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000010992 reflux Methods 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 230000007704 transition Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal fan and a dust collector with the same, wherein the centrifugal fan comprises: the device comprises a shell, an impeller, a stator blade assembly and a motor. The casing has air intake and air outlet, and the impeller is established in the casing and is close to the air intake and set up, and quiet leaf subassembly is established in the casing and is located the low reaches of impeller, prescribes a limit to between the inner wall of quiet leaf subassembly and casing and is suitable for the wind channel that the air current flows, and the parallel axis cross-section in wind channel is "U" shape, and the motor is established in the low reaches of quiet leaf subassembly and links to each other with the impeller. According to the centrifugal fan, the section of the parallel axis of the air channel defined between the stationary blade assembly and the shell is arranged in the U shape, so that the loss generated in the process of air flow flowing in the air channel can be effectively reduced, and the noise can be reduced.
Description
Technical Field
The invention relates to the technical field of dust collectors, in particular to a centrifugal fan and a dust collector with the same.
Background
The centrifugal fan for the dust collector is a core functional component of the dust collector, and high efficiency, energy conservation and low noise are one of important trends in the development of the centrifugal fan. The reasonable pneumatic design and the structural design of the centrifugal fan can effectively improve the performance of the dust collector, reduce energy consumption and improve the noise level and the sound quality. The centrifugal fan for the dust collector in the related art has a large loss of the air flow in the flowing process due to the self-limitation of the structural design, so that the energy consumption is high and the generated noise is large.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the centrifugal fan which is low in energy consumption and low in noise.
The invention also provides a dust collector with the centrifugal fan.
According to an embodiment of the first aspect of the invention, the centrifugal fan comprises: a housing having an air inlet and an air outlet; the impeller is arranged in the shell and is adjacent to the air inlet; the impeller comprises a shell, a fixed blade assembly, a blade and a blade support, wherein the shell is internally provided with a fan blade, the fixed blade assembly is arranged in the shell and is positioned at the downstream of the impeller, an air duct suitable for airflow flowing is defined between the fixed blade assembly and the inner wall of the shell, and the section of a parallel axis of the air duct is U-shaped; and the motor is arranged at the downstream of the static blade assembly and is connected with the impeller.
According to the centrifugal fan disclosed by the embodiment of the invention, the section of the air channel defined between the stationary blade assembly and the shell, which is parallel to the axis, is arranged in a U shape, so that the loss generated in the process of flowing air in the air channel can be effectively reduced, and the noise can be reduced.
According to some optional embodiments of the invention, the vane assembly comprises: the vane diffuser is arranged close to the impeller and comprises a diffuser body and a plurality of diffuser vanes arranged on the diffuser body, and the diffuser vanes are arranged at intervals along the circumferential direction of the diffuser body and surround the periphery of the impeller; the backward flow ware, the backward flow ware is established the low reaches of blade diffuser, the backward flow ware includes the backward flow ware body and establishes a plurality of backward flow blades on the backward flow ware body, the backward flow ware body with the diffuser body links to each other and constitutes the wheel hub of quiet leaf subassembly, it is a plurality of backward flow blade is followed the circumference interval of backward flow ware body sets up, the orientation of backward flow ware body the wall orientation of motor is along keeping away from in the direction at the center of backward flow ware body the direction slope of air intake extends. Therefore, the wall surface of the reflux device facing the motor is arranged to be an inclined surface extending obliquely, so that airflow flowing out of the U-shaped air channel is converted from radial to axial under the guide of the inclined surface, the flow channel loss is reduced, and the heat dissipation of the motor is facilitated.
Alternatively, a wall surface of the reflow device body facing the motor is formed into an arc-shaped surface. Therefore, the shape of the wall surface of the reflux device body facing the motor can be further optimized, and the better guiding effect on the air flow can be achieved.
Furthermore, a plurality of diffuser blades are arranged near the outer periphery of the diffuser body, the part of the diffuser body, which is located between two adjacent diffuser blades, is formed into a flow guide surface, and the flow guide surface extends obliquely in the direction away from the air inlet in the direction away from the center of the diffuser body. Therefore, the aerodynamic characteristics of the flow channel are improved, and the flow loss of the airflow is reduced.
Optionally, the deflector surface is formed as an arcuate surface. Thereby, it is further facilitated to guide the flow of the air flow, further reducing the flow loss of the air flow.
Optionally, the included angle between the flow guide surface and the rotation plane of the impeller is α, the included angle α satisfies α ≤ 30 °, and the rotation plane is a plane perpendicular to the rotation central axis of the impeller, thereby, the inclination angle α of the flow guide surface is limited in the above range, and the impact loss caused by the excessively large inclination angle of the flow guide surface can be avoided while the flow loss caused by the large-angle turning of the air flow is reduced.
Optionally, an outer end of each diffuser vane extends outwards beyond the outer peripheral edge of the diffuser body, and/or an outer end of each backflow vane extends outwards beyond the outer peripheral edge of the backflow device body. Therefore, the distance of the air flow doing work can be prolonged, and the efficiency of the whole machine is improved.
Optionally, a portion of the outer circumferential edge of the hub, which is located between two adjacent diffuser blades, is formed as a cutting segment, a connecting line between outer ends of two adjacent diffuser blades is an outer connecting line, and the cutting segment extends from an outer end of one of two adjacent diffuser blades toward the other of the two adjacent diffuser blades and is inwardly deviated from the outer connecting line. Therefore, the flow area of the airflow is increased by adopting a cutting mode in the curve of the blade diffuser and the return device, and the flow speed and the downstream flow loss are reduced.
Further, a perpendicular line between an outer end of the one of the two adjacent diffuser blades and the other of the two adjacent diffuser blades is an inner connecting line, and the cutting segment is a median line of a portion of the other of the two adjacent diffuser blades between the outer connecting line and the inner connecting line. Therefore, the cutting mode can be further optimized through the arrangement, the flow area is more reasonable to set, and the flow speed and the downstream flow loss are reduced while the effect of the blade diffuser on the airflow is ensured.
According to some optional embodiments of the invention, the vane assembly comprises: the vane diffuser is arranged close to the impeller and comprises a diffuser body and a plurality of diffuser vanes arranged on the diffuser body, and the diffuser vanes are arranged at intervals along the circumferential direction of the diffuser body and surround the periphery of the impeller; the backward flow ware, the backward flow ware is established the low reaches of blade diffuser, the backward flow ware includes the backward flow ware body and establishes a plurality of backward flow blades on the backward flow ware body, the backward flow ware body with the diffuser body links to each other and constitutes the wheel hub of quiet leaf subassembly, it is a plurality of backward flow blade is followed the circumference interval of backward flow ware body sets up, still be equipped with on the backward flow ware body and be used for the installation the installing support of motor, the installing support with the inner of backward flow blade links to each other. From this, through linking to each other the return flow blade that is used for the installing support of installation motor and backward flow ware, can make things convenient for the installation of motor and make centrifugal fan's overall structure set up more compactly, reasonable.
Further, the mounting bracket is formed into a column shape and is in smooth transition connection with the inner end of the backflow blade. Therefore, the mounting bracket is simple in structure and easy to machine and mold.
A vacuum cleaner according to an embodiment of the second aspect of the present invention includes: a centrifugal fan according to an embodiment of the first aspect of the invention.
According to the dust collector provided by the embodiment of the invention, the centrifugal fan is arranged, so that the energy efficiency of the dust collector can be improved, and the working noise can be reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a sectional view of a partial structure of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a vane assembly of a centrifugal fan according to an embodiment of the present disclosure;
FIG. 3 is a sectional view of a vane assembly of a centrifugal fan according to an embodiment of the present invention;
FIG. 4 is a schematic view of a vane diffuser of a centrifugal fan according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of a hub cutting pattern of a vane assembly of a centrifugal fan according to an embodiment of the present invention;
FIG. 6 is a schematic view of a centrifugal fan return according to an embodiment of the present invention.
Reference numerals:
a shell 1, a front cover 11, an air inlet 111, a rear baffle 12, an air outlet 121,
the impeller 2, the cover plate 21, the vent 211, the base plate 22, the moving blades 23,
the static blade component 3, the blade diffuser 31, the diffuser body 311, the diffuser blade 312, the flow guide surface 313, the return device 32, the return device body 321, the wall surface 3211, the return blade 322, the mounting bracket 323, the mounting hole 3231, the hub 33, the cutting section 331, the external connecting line 332, the internal connecting line 333,
the first section 41, the second section 42, the third section 43,
and a motor 5.
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 "central," "longitudinal," "lateral," "front," "back," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. 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.
A centrifugal fan according to an embodiment of the present invention is described below with reference to fig. 1 to 6.
As shown in fig. 1 to 6 (the direction of the arrow in fig. 1 is the airflow direction), the centrifugal fan according to the embodiment of the first aspect of the present invention includes: the impeller comprises a shell 1, an impeller 2, a static blade assembly 3 and a motor 5.
Specifically, the casing 1 has the air inlet 111 and the air outlet 121, and the casing 1 may have a shape of a rotary body. The case 1 may include a front cover 11 and a rear barrier 12 connected to each other, wherein the intake vent 111 is formed on the front cover 11 and the exhaust vent 121 is formed on the rear barrier 12.
The impeller 2 and the stationary blade assembly 3 are both disposed in the casing 1, wherein the impeller 2 is disposed adjacent to the air inlet 111, the impeller 2 may include a cover plate 21 and a base plate 22 disposed at intervals in a front-rear direction (refer to a front-rear direction in fig. 1) and a plurality of moving blades 23 disposed between the cover plate 21 and the base plate 22, and the cover plate 21 is provided with a ventilation opening 211 communicating with the air inlet 111. The stationary blade assembly 3 is located downstream of the impeller 2 (for example, in the example of fig. 1, the stationary blade assembly 3 is located on the rear side of the impeller 2), an air duct adapted to the flow of the air flow is defined between the stationary blade assembly 3 and the inner wall of the casing 1, and the motor 5 is provided downstream of the stationary blade assembly 3 and connected to the impeller 2 (for example, in the example of fig. 1, the motor 5 is located on the rear side of the stationary blade assembly 3 and outside the casing 1).
Therefore, when the centrifugal fan works, the motor 5 drives the impeller 2 to rotate, external air enters the impeller 2 from the air inlet 111 and the ventilation opening 211 and flows into the air duct after being pressurized and accelerated by the impeller 2, airflow flows out of the air outlet 121 after flowing through the air duct, and a part of airflow flowing out of the air outlet 121 can dissipate heat of the motor 5, so that the service life of the motor 5 can be prolonged.
The cross section of the air duct with parallel axes (the "cross section of the air duct with parallel axes" refers to a cross section obtained by cutting the air duct along a plane passing through the rotation central axis of the impeller 2) is "U" shaped (see fig. 1). Therefore, the loss generated in the process of the air flow flowing in the air duct can be effectively reduced, and the noise can be reduced.
For example, in the example of fig. 1, the "U" -shaped duct includes: a first section 41 defined by the forward sidewall of the casing 1 and the forward side surface of the vane assembly 3, a second section 42 defined by the peripheral wall of the casing 1 and the peripheral wall of the vane assembly 3, and a third section 43 defined by the aft sidewall of the casing 1 and the aft side surface of the vane assembly 3. Wherein the first section 41 and the third section 43 of the "U" -shaped air duct extend substantially in the radial direction of the stationary blade assembly 3, the second section 42 of the "U" -shaped air duct extends in the axial direction of the stationary blade assembly 3, and the transition sections between the first section 41 and the second section 42 of the "U" -shaped air duct and between the third section 43 and the second section 42 of the "U" -shaped air duct are circular arc-shaped. Therefore, when the air flow flows through the air channel, the circular arc transition is adopted between the sections of the air channel, so that the air flow flows more smoothly, the problem that the air flow turns in the air channel harder is solved, the flow loss of the air flow is reduced, and the noise generated by the air flow can be reduced.
Alternatively, the second section 42 of the "U" shaped duct may extend linearly or arcuately.
According to the centrifugal fan disclosed by the embodiment of the invention, the section of the air channel defined between the stationary blade assembly 3 and the shell 1 and parallel to the axis is arranged in a U shape, so that the loss generated in the process of flowing air flow in the air channel can be effectively reduced, and the noise can be reduced.
According to some alternative embodiments of the present invention, referring to fig. 1 to 6, the vane assembly 3 includes: a vane diffuser 31 and a diffuser 32. The vane diffuser 31 is arranged adjacent to the impeller 2, the vane diffuser 31 includes a diffuser body 311 and a plurality of diffuser vanes 312 arranged on the diffuser body 311, the plurality of diffuser vanes 312 are arranged at intervals along the circumferential direction of the diffuser body 311 and surround the periphery of the impeller 2, the number range of the diffuser vanes 312 can be 17-30, the diffuser vanes 312 can be arc-shaped or airfoil-shaped, and the diffuser vanes 312 can be vanes with equal thickness. The backflow device 32 is disposed downstream of the vane diffuser 31 (for example, in the example of fig. 1 to 3, the backflow device 32 is located at the rear side of the vane diffuser 31), the backflow device 32 includes a backflow device body 321 and a plurality of backflow blades 322 disposed on the backflow device body 321, the backflow device body 321 is connected to the diffuser body 311 and constitutes the hub 33 of the stationary vane assembly 3, the plurality of backflow blades 322 are disposed at intervals along the circumferential direction of the backflow device body 321, the number of the backflow blades 322 may range from 7 to 15, the backflow blades 322 may be arc-shaped or airfoil-shaped, and the backflow blades 322 may be equal-thickness blades. Alternatively, the diffuser body 311 and the return body 321 may be integrally formed, that is, the hub 33 of the stationary blade assembly 3 may be an integrally formed part, so that the structure and the forming process of the centrifugal fan may be simplified.
Therefore, when the centrifugal fan operates (refer to fig. 1), external air enters the impeller 2 from the air inlet 111, and flows into the part of the air duct between the vane diffuser 31 and the housing 1 after being pressurized and accelerated by the impeller 2, the airflow can change the flow into divergent flow after being acted by the vane diffuser 31, the speed of the airflow is reduced, meanwhile, the rotational component velocity of a part of the airflow can be recovered to be the meridian velocity, and the flow loss at the downstream can be reduced, so that the airflow enters the return device 32 under the action of the diffusion and energy recovery of the vane diffuser 31. The function of the backflow device 32 is to restore the radial flow of the airflow to axial flow, the airflow flowing out of the backflow device 32 flows out of the air outlet 121, and the flowing airflow can dissipate heat of the motor 5, so that efficient and stable operation of the motor 5 can be guaranteed.
Referring to fig. 1 and 3, a wall surface 3211 of the reflow device main body 321 facing the motor 5 extends obliquely in a direction away from the air inlet 111 in a direction toward the center of the reflow device main body 321. Therefore, the wall surface 3211 of the return device 32 facing the motor 5 is provided with an inclined surface extending obliquely, so that the airflow flowing out of the U-shaped air duct can be converted from the radial direction to the axial direction under the guidance of the inclined surface, thereby reducing the flow passage loss and facilitating the heat dissipation of the motor 5.
For example, in the example of fig. 1 and 3, the wall 3211 of the backflow device body 321 extends obliquely rearward from the outer periphery of the backflow device body 321 in the direction to the center of the backflow device body 321, so that the airflow flowing out of the "U" -shaped air duct can be changed from the radial direction to the axial direction while the airflow flows along the wall 3211 of the backflow device body 321, and the airflow can be smoothly and softly turned, so that the airflow can be turned while the flow loss is reduced. This air current is after the transition is axial flow, can dispel the heat to motor 5, is carrying out radiating in-process to motor 5, can avoid the air current directly to let in the great loss that causes because of the resistance in the stator-rotor structure of motor 5 simultaneously.
Alternatively, referring to fig. 1 and 3, a wall surface 3211 of the backflow device body 321 facing the motor 5 may be formed as an arc-shaped surface. Therefore, the shape of the wall surface 3211 of the return device main body 321 facing the motor 5 can be further optimized, so that the airflow flows more smoothly and softly, and the better guiding effect on the airflow is achieved.
Further, an inner wall surface of the casing 1 facing the reflector body 321 is formed into an arc-shaped surface, for example, in the example of fig. 1, an inner wall surface of the back flap 12 of the casing 1 facing the reflector body 321 is formed into an arc-shaped surface. From this, the common guide effect of the arcwall face through backward flow ware body 321 and the arcwall face of casing 1 can further make the air current flow more smooth and easy, and make the air current more better be the axial by radial transition, reduce the runner loss, be favorable to the heat dissipation of motor 5 simultaneously.
In some alternative embodiments of the present invention, referring to fig. 1, 2 and 4, a plurality of diffuser blades 312 are disposed adjacent to the outer circumferential edge of the diffuser body 311, and a portion of the diffuser body 311 between two adjacent diffuser blades 312 is formed as a flow guide surface 313, and the flow guide surface 313 extends obliquely in a direction away from the air inlet 111 in a direction away from the center of the diffuser body 311. Therefore, the aerodynamic characteristics of the flow channel are improved, and the flow loss of the airflow is reduced.
For example, in the example of fig. 1, 2 and 4, the flow guide surface 313 extends obliquely upward and rearward in a direction from the center of the diffuser body 311 to the outer periphery of the diffuser body 311, so that the guide surface 313 guides the flow accelerated by the impeller 2 while the flow is flowing to the U-shaped air passage, thereby reducing energy loss due to the sharp turning of the flow and reducing flow noise. Alternatively, the flow guide surface 313 may be formed as an arc surface. Thereby, it is further facilitated to guide the flow of the air flow, further reducing the flow loss of the air flow.
Optionally, the included angle between the flow guiding surface 313 and the rotation plane of the impeller 2 is α (refer to fig. 1), α satisfies α ≦ 30 °, and the rotation plane is a plane perpendicular to the rotation central axis of the impeller 2, thereby limiting the inclination angle α of the flow guiding surface 313 within the above range, reducing the flow loss caused by the large angle turning of the air flow, and avoiding the impact loss caused by the excessively large inclination angle of the flow guiding surface 313.
For example, in the example of fig. 1, the impeller 2 includes the above-mentioned base plate 22, the cover plate 21 and the plurality of moving blades 23, wherein the base plate 22 and the cover plate 21 may be disposed parallel to each other and both the base plate 22 and the cover plate 21 are parallel to the rotation plane of the impeller 2, and in this case, α is the angle between the flow guide surface 313 and the plane of the base plate 22.
Alternatively, referring to fig. 4 and 6, the outer end of each diffuser vane 312 extends outwardly beyond the outer peripheral edge of the diffuser body 311, and/or the outer end of each return vane 322 extends outwardly beyond the outer peripheral edge of the return body 321. For example, only the outer end of each diffuser vane 312 may extend outward beyond the outer circumferential edge of the diffuser body 311, so that the working distance of the airflow flowing over the vane diffuser 31 may be extended; for example, only the outer end of each backflow blade 322 may extend outward beyond the outer peripheral edge of the backflow device body 321, so that the working distance of the airflow flowing over the backflow device 32 can be prolonged; for example, the outer end of each diffuser vane 312 extends outwardly beyond the outer peripheral edge of the diffuser body 311, and the outer end of each return vane 322 extends outwardly beyond the outer peripheral edge of the return body 321, thereby extending the working distance of the airflow over both the vane diffuser 31 and the return device 32. Therefore, the distance of the air flow doing work can be prolonged, and the efficiency of the whole machine is improved.
In some alternative embodiments of the present invention, referring to fig. 4 and 5, a portion of the outer peripheral edge of the hub 33 between two adjacent diffuser blades 312 is formed as a cut section 331, a connecting line between outer ends of the two adjacent diffuser blades 312 (the "outer end of the diffuser blade 312" refers to an end of the diffuser blade 312 away from the center of the diffuser body 311) is an outer connecting line 332, and the cut section 331 extends from the outer end of one of the two adjacent diffuser blades 312 toward the other of the two adjacent diffuser blades 312 and is offset from the outer connecting line 332 inward (the "inward" refers to a direction toward the center of the diffuser body 311). Thus, the flow velocity and the downstream flow loss can be reduced by increasing the flow area of the air flow by cutting the vane diffuser 31 and the return duct 32 at the curved portion.
Further, referring to fig. 5, a perpendicular line between the outer end of the one of the adjacent two diffuser blades 312 and the other of the adjacent two diffuser blades 312 is an interconnection 333, and the cutting section 331 is a median line of a portion of the other of the adjacent two diffuser blades 312 between the outer connection 332 and the interconnection 333. The outer connecting line 332, the inner connecting line 333, and the portion of the other one of the two adjacent diffusion fins 312 between the outer connecting line 332 and the inner connecting line 333 define a triangle, that is, the portions of the outer connecting line 332, the inner connecting line 333, and the portion of the other one of the two adjacent diffusion fins 312 between the outer connecting line 332 and the inner connecting line 333 respectively form three sides a, b, and c of the triangle, wherein a central line corresponding to the side c is the position of the cutting segment 331. Therefore, the cutting mode can be further optimized through the arrangement, the flow area is more reasonable to set, and the flow speed and the downstream flow loss are reduced while the effect of the vane diffuser 31 on the airflow is ensured.
According to some alternative embodiments of the present invention, referring to fig. 1, 3 and 6, the vane assembly 3 includes: a vane diffuser 31 and a diffuser 32. The blade diffuser 31 is adjacent to the impeller 2, the blade diffuser 31 includes a diffuser body 311 and a plurality of diffuser blades 312 arranged on the diffuser body 311, the plurality of diffuser blades 312 are arranged along the circumference interval of the diffuser body 311 and surround the periphery of the impeller 2, the return device 32 is arranged at the downstream of the blade diffuser 31, the return device 32 includes a return device body 321 and a plurality of return blades 322 arranged on the return device body 321, the return device body 321 is connected with the diffuser body 311 and forms the hub 33 of the stationary blade assembly 3, and the plurality of return blades 322 are arranged along the circumference interval of the return device body 321. The reflux device body 321 is provided with a mounting bracket 323 for mounting the motor 5, the mounting bracket 323 is connected with the inner end of the reflux blade 322, and the mounting bracket 323 is provided with a mounting hole 3231 for mounting the motor 5. Therefore, the mounting bracket 323 for mounting the motor 5 is connected with the return blade 322 of the return device 32, so that the mounting of the motor 5 is facilitated, and the overall structure of the centrifugal fan is more compact and reasonable.
Further, referring to fig. 6, the mounting bracket 323 is formed in a cylindrical shape and is smoothly transitionally connected with an inner end of the backflow vane 322 (the "inner end of the backflow vane 322" refers to an end of the backflow vane 322 facing the center of the backflow body 321). Therefore, the mounting bracket 323 has a simple structure and is easy to machine and mold, and when the airflow flows inwards (the inward direction is a direction toward the center of the backflow device body 321) along the outer end of the backflow blade 322 (the outer end of the backflow blade 322 refers to one end of the backflow blade 322 away from the center of the backflow device body 321) to the inner end of the backflow blade 322, the inner ends of the mounting bracket 323 and the backflow blade 322 are in smooth transition, so that the smoothness of the airflow flow can be ensured, and the noise can be reduced.
A vacuum cleaner according to an embodiment of the second aspect of the present invention includes: a centrifugal fan according to an embodiment of the first aspect of the invention.
According to the dust collector provided by the embodiment of the invention, the centrifugal fan is arranged, so that the energy efficiency of the dust collector can be improved, and the working noise can be reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 (10)
1. A centrifugal fan, comprising:
a housing having an air inlet and an air outlet;
the impeller is arranged in the shell and is adjacent to the air inlet;
a stationary blade assembly disposed within the casing downstream of the impeller, the stationary blade assembly defining an air duct adapted for airflow flow with an inner wall of the casing, the section of the parallel axis of the air duct is U-shaped, the stationary blade component comprises a blade diffuser and a reflux device, the vane diffuser is arranged close to the impeller and comprises a diffuser body and a plurality of diffusion vanes arranged on the diffuser body, the diffusion vanes are arranged at intervals along the circumferential direction of the diffuser body and surround the periphery of the impeller, the reflux device is arranged at the downstream of the blade diffuser and comprises a reflux device body and a plurality of reflux blades arranged on the reflux device body, the backflow device body is connected with the diffuser body and forms a hub of the static blade assembly, and a plurality of backflow blades are arranged at intervals along the circumferential direction of the backflow device body;
the motor, the motor is established the low reaches of quiet leaf subassembly and with the impeller links to each other, be equipped with on the backward flow ware body and be used for the installation the installing support of motor, the installing support with the inner of backward flow blade links to each other, the installing support form into the column and with the smooth transitional coupling in inner of backward flow blade, the installing support is in the ascending size in the circumferential direction of backward flow ware body is greater than the backward flow blade is in the ascending size in the circumferential direction of backward flow ware body, the installing support with the inner of backward flow blade links to each other through the changeover portion, by the backward flow blade extremely in the direction of installing support, the changeover portion is in the ascending size in the circumferential direction of backward flow ware body increases gradually.
2. The centrifugal fan of claim 1, wherein the vane assembly comprises:
the vane diffuser is arranged close to the impeller and comprises a diffuser body and a plurality of diffuser vanes arranged on the diffuser body, and the diffuser vanes are arranged at intervals along the circumferential direction of the diffuser body and surround the periphery of the impeller;
the backward flow ware, the backward flow ware is established the low reaches of blade diffuser, the backward flow ware includes the backward flow ware body and establishes a plurality of backward flow blades on the backward flow ware body, the backward flow ware body with the diffuser body links to each other and constitutes the wheel hub of quiet leaf subassembly, it is a plurality of backward flow blade is followed the circumference interval of backward flow ware body sets up, the orientation of backward flow ware body the wall orientation of motor is along keeping away from in the direction at the center of backward flow ware body the direction slope of air intake extends.
3. The centrifugal fan as claimed in claim 2, wherein a wall surface of the backflow device body facing the motor is formed into an arc-shaped surface.
4. The centrifugal fan as claimed in claim 2, wherein a plurality of the diffuser blades are disposed adjacent to an outer circumferential edge of the diffuser body, and a portion of the diffuser body between two adjacent diffuser blades is formed as a flow guide surface extending obliquely in a direction away from the air inlet in a direction away from a center of the diffuser body.
5. The centrifugal fan of claim 4 wherein the flow guide surface is formed as an arcuate surface.
6. The centrifugal fan as claimed in claim 4, wherein the included angle between the flow guide surface and the rotation plane of the impeller is α, the included angle is α, α is equal to or less than 30 degrees, and the rotation plane is a plane perpendicular to the rotation central axis of the impeller.
7. The centrifugal fan as claimed in claim 2, wherein an outer end of each diffuser vane extends outwardly beyond a peripheral edge of the diffuser body and/or an outer end of each return vane extends outwardly beyond a peripheral edge of the return body.
8. The centrifugal fan as claimed in claim 2, wherein a portion of the outer peripheral edge of the hub between adjacent two of the diffuser blades is formed as a cut segment, a line connecting outer ends of adjacent two of the diffuser blades is an outer line, and the cut segment extends from the outer end of one of adjacent two of the diffuser blades toward the other of adjacent two of the diffuser blades and is inwardly offset from the outer line.
9. The centrifugal fan as claimed in claim 8, wherein a perpendicular line between an outer end of the one of the adjacent two diffuser blades and the other of the adjacent two diffuser blades is an interconnector, and the cut section is a median line of a portion of the other of the adjacent two diffuser blades between the interconnector and the outer line.
10. A vacuum cleaner, comprising: centrifugal fan according to any of claims 1-9.
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| CN201710331122.2A CN106989034B (en) | 2017-05-11 | 2017-05-11 | Centrifugal fan and dust collector with same |
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| CN201710331122.2A CN106989034B (en) | 2017-05-11 | 2017-05-11 | Centrifugal fan and dust collector with same |
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| CN106989034A CN106989034A (en) | 2017-07-28 |
| CN106989034B true CN106989034B (en) | 2020-05-08 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020253093A1 (en) * | 2019-06-20 | 2020-12-24 | 苏州工业园区星德胜电机有限公司 | High-efficiency dry and wet dual-use fan |
| CN110617230B (en) * | 2019-09-09 | 2024-07-02 | 杭州奥正智能有限公司 | Centrifugal fan of dust collector |
| CN112806902B (en) * | 2019-11-18 | 2022-08-05 | 珠海格力电器股份有限公司 | Motor and dust catcher |
| US12196226B2 (en) * | 2020-11-13 | 2025-01-14 | Taco, Inc. | Rotating assembly with integral magnetic filter for wet rotor circulating pump |
| CN114680706B (en) * | 2020-12-25 | 2023-01-24 | 广东美的白色家电技术创新中心有限公司 | Fan assembly and dust collector |
| CN118019271B (en) * | 2024-04-09 | 2024-06-21 | 英飞同仁(江苏)风机有限公司 | Reinforcing radiating EC fan electron device protecting cover |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3331877B2 (en) * | 1996-08-30 | 2002-10-07 | 株式会社日立製作所 | Electric vacuum cleaner |
| GB2388017A (en) * | 2002-04-30 | 2003-11-05 | Johnson Electric Sa | Diffuser plate |
| JP2006250016A (en) * | 2005-03-10 | 2006-09-21 | Matsushita Electric Ind Co Ltd | Electric blower and vacuum cleaner using it |
| JP2009024590A (en) * | 2007-07-19 | 2009-02-05 | Sanyo Electric Co Ltd | Electric blower |
| JP5048701B2 (en) * | 2009-03-10 | 2012-10-17 | 三菱電機株式会社 | Electric blower and electric vacuum cleaner |
| JP5601358B2 (en) * | 2012-09-13 | 2014-10-08 | 三菱電機株式会社 | Electric blower and vacuum cleaner |
| JP6417771B2 (en) * | 2014-07-31 | 2018-11-07 | 日本電産株式会社 | Electric blower |
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Effective date of registration: 20201223 Address after: 528311 4 Global Innovation Center, industrial road, Beijiao Town, Shunde District, Foshan, Guangdong, China Patentee after: GUANGDONG MEIDI WHITE HOUSEHOLD ELECTRICAL APPLIANCE TECHNOLOGY INNOVATION CENTER Co.,Ltd. Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311, 26-28, B District, Mei headquarters building, 6 Mei Road, Beijiao Town, Shunde District, Foshan, Guangdong. Patentee before: MIDEA GROUP Co.,Ltd. |
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