CN110242598A - Centrifugal fan - Google Patents
Centrifugal fan Download PDFInfo
- Publication number
- CN110242598A CN110242598A CN201910154478.2A CN201910154478A CN110242598A CN 110242598 A CN110242598 A CN 110242598A CN 201910154478 A CN201910154478 A CN 201910154478A CN 110242598 A CN110242598 A CN 110242598A
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- China
- Prior art keywords
- axial
- centrifugal fan
- impeller
- radial
- shell
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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
- 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
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
-
- 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
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- 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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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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
- F04D29/663—Sound attenuation
-
- 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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
-
- 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
Abstract
The present invention provides a kind of centrifugal fan.Centrifugal fan includes: the motor with rotor；The impeller for being fixed on rotor and being rotated together with rotor；The circuit board being electrically connected with motor；And accommodate the shell of motor, impeller and circuit board.Impeller includes multiple blade parts, and the multiple blade part is configured across gap in the circumferential, and extends towards radial outside；Cricoid upper shield, the upper shield connect the axial top of multiple blade parts；And cricoid lower shield, the lower shield connect the axial lower section of multiple blade parts.Shell has the upper shell of the axial top of covering impeller.Upper shell includes canister portion, and cartridge is opposite with upper shield across the first gap radially；And cricoid plectane portion, the plectane portion extend from canister portion to radially inner side, and opposite with the upper axial end portion of upper shield across the second gap in the axial direction.Have in the plectane portion that radially inner side is provided with air entry in the lower surface axial valley that top is recessed in the axial direction.
Description
Technical field
The present invention relates to centrifugal fans.
Background technique
Centrifugal fan is disclosed in Japanese Kokai 2012-132363 bulletin.In centrifugal fan, in shell
Impeller is accommodated between upper plate and lower plate, which has the multiple blades circumferentially arranged.Centrifugal fan will be with impeller
Rotation and from the suction inlet for the upper plate for being set to shell suck air from the periphery of impeller blow out.The cylindrical portion of impeller it is upper
End forms the warpage portion of bell mouth shape, and the warpage portion is prominent from shell and warpage forms outward.Near the periphery of impeller, from
The air of impeller blowout is flowed into the gap between impeller and the upper plate of shell.The air towards suction inlet adverse current, and with from
The air-flow interflow of suction inlet sucking.
However, if air-flow collaborates as described above, it is likely that generate noise because of the generation of turbulent flow at suction inlet.
Moreover, the soakage of the air-flow at suction inlet is reduced because of the generation of turbulent flow, the air-supply for being thus likely to result in centrifugal fan is special
Property decline.
Summary of the invention
The excellent and small noise centrifugal fan the purpose of the present invention is to provide a kind of Diffusion performance.
The centrifugal fan of illustrative embodiment of the invention includes: motor, and the motor has the above lower extension
The rotor rotated centered on central axis；Impeller, the impeller is fixed on the rotor, and rotates together with the rotor；
Circuit board, the circuit board are electrically connected with the motor；And shell, the shell accommodate the motor, the impeller and
The circuit board.The impeller includes multiple blade parts, and the multiple blade part is configured across gap in the circumferential, and court
Extend to radial outside；Cricoid upper shield, the upper shield connect at least one of the axial top of multiple blade parts
Point；And cricoid lower shield, the lower shield connect at least part of the axial lower section of multiple blade parts.It is described outer
Shell has the upper shell for the axial top for covering the impeller.The upper shell includes canister portion, cartridge radially across
First gap and it is opposite with the upper shield；And cricoid plectane portion, the plectane portion prolongs from cartridge to radially inner side
It stretches, and opposite with the upper axial end portion of the upper shield across the second gap in the axial direction.Radial direction in the plectane portion
Inside is provided with air entry.The plectane portion has the lower surface axial valley that top is recessed in the axial direction in the plectane portion.
The centrifugal fan of illustrative embodiment according to the present invention, is capable of providing that a kind of Diffusion performance is excellent and noise
Small centrifugal fan.
There is the detailed description of the preferred embodiment for the present invention below, referring to attached drawing, can be more clearly understood that the present invention
Above-mentioned and other feature, element, step, features and advantages.
Detailed description of the invention
Fig. 1 is the integrally-built stereoscopic for showing centrifugal fan involved in illustrative embodiment of the invention
Figure.
Fig. 2 is the vertical sectional view of centrifugal fan involved in illustrative embodiment of the invention.
Fig. 3 is the perspective view of the impeller from axial top.
Fig. 4 is the partial sectional view of centrifugal fan involved in illustrative embodiment.
Fig. 5 is the perspective view for showing the structural example of shell.
Fig. 6 A is the bottom view for showing an example of axial valley.
Fig. 6 B is the bottom view for showing other an examples of axial valley.
Fig. 7 is the perspective view for showing the other structures example of shell.
Specific embodiment
Hereinafter, being illustrated referring to attached drawing to illustrative embodiment of the invention.In addition, in the present specification, it will
The rotation axis of the motor 30 of centrifugal fan 100 is referred to as central axis P, and the direction parallel with central axis P is referred to as " axial direction ".
Also, " axial top " will be referred to as from circuit board 40 towards the direction of impeller 10, it will be from impeller 10 towards the direction of circuit board 40
Referred to as " axial lower section ".In the surface of each constituent element, the face towards axial top is referred to as " upper surface ", it will be towards axis
Face downwards is referred to as " lower surface ".Also, in each constituent element, the end of axial top is referred to as " upper axial end
The position of the end of axial top is referred to as " upper axial end " by portion ".Moreover, the end of axial lower section is referred to as " lower axial end
The position of the end of axial lower section is referred to as " lower axial end " by portion ".
Also, the direction for being extended the straight line vertical with central axis P is referred to as " radial direction ".Also, it will be towards central axis
The radial side of line P is referred to as " radially inner side ", and the radial other side that will be far from central axis P is referred to as " radial outside ".Each
In the side of constituent element, " radial side " will be referred to as towards radial side.Especially the side towards radially inner side is claimed
Make in " radially inner side face ", the side towards radial outside is referred to as " radial outer side ".It, will also, in each constituent element
End radially is referred to as " longitudinal end ", and the position of end radially is referred to as " longitudinal end ".Especially by radially inner side
End be referred to as " radial inner end ", by the position of the end of radially inner side be referred to as " radial inner end ".Moreover, by radial outside
End is referred to as " radially outer end ", and the position of the end of radial outside is referred to as " radial outer end ".
Sometimes it will be referred to as " circumferential direction " along the direction of the direction of rotation centered on central axis P.Also, it is seen from axial lower section
When examining, clockwise circumferential direction is referred to as " Rdf on front side of direction of rotation ", anticlockwise circumferential direction is referred to as " direction of rotation
Rear side Rdb ".In the side of each constituent element, the side towards direction of rotation is referred to as " direction of rotation side ".Especially
" direction of rotation leading flank " will be referred to as towards the side on front side of direction of rotation, " rotation will be referred to as towards the side on rear side of direction of rotation
Turn direction trailing flank ".
In addition, being not offered as being assembled in physical device in addresses such as direction described above, face, end and its positions
When positional relationship and direction etc..
Also, in this application, " parallel direction " also includes substantially parallel direction.Also, it in this application, " hangs down
Straight direction " also includes generally perpendicular direction.
Fig. 1 is the integrally-built appearance for showing centrifugal fan 100 involved in illustrative embodiment of the invention
Perspective view.Fig. 2 is the vertical sectional view of centrifugal fan 100 involved in illustrative embodiment of the invention.In addition, Fig. 1
In be to observe centrifugal fan 100 from axial top.
As shown in Figure 1 and Figure 2, centrifugal fan 100 includes shell 1, impeller 10, motor 30 and circuit board 40.
Shell 1 accommodates impeller 10, motor 30 and circuit board 40.Shell 1 has upper shell 2 and lower casing 3.Upper shell 2
It is for example made of resin with lower casing 3.But upper shell 2 and lower casing 3 are such as can also material other than the resin as metal
It constitutes.Upper shell 2 and lower casing 3 can be made of identical material, can also be made of different materials.
Upper shell 2 covers the axial top of impeller 10.Compared with the structure of not set upper shell 2, by the way that upper shell 2 is arranged
It is able to suppress and generates turbulent flow on the periphery of aftermentioned upper shield 15, centrifugal fan 100 can efficiently send out sky to centrifugal direction
Gas.Upper shell 2 has the air entry 2a opposite with the radial central portion of impeller 10.Air entry 2a is rounded.But air entry 2a
Shape be also possible to the shape other than circle.In addition, being illustrated later to the structure of upper shell 2.
In the present embodiment, exhaust outlet 2b is arranged between upper shell 2 and lower casing 3, and exhaust outlet 2b setting exists
In the entire circumferential direction of shell 1.But it is not limited to the illustration, exhaust outlet 2b can also be positioned only at circumferential one of shell 1
Part.
Lower casing 3 is configured at the axial lower section of impeller 10.When from axial overlook view, lower casing 3 is rectangular, be with
The roughly the same size of upper shell 2.Lower casing 3 has substrate receiving portion 4 and flange part 5.
Lower section is recessed substrate receiving portion 4 in the axial direction, and accommodates circuit board 40.In the present embodiment, substrate receiving portion 4 is
Shape identical with circuit board 40 is slightly larger than circuit board 40 radially.But the shape of substrate receiving portion 4 can also be with electricity
The shape of road plate 40 is not identical.Motor 30 is located at the radial central portion of substrate receiving portion 4, and a part of circuit board 40 is relative to horse
It is prominent up to 30 to radial outside.
Flange part 5 extends from the radially outer end of substrate receiving portion 4 to radial outside.In the present embodiment, for example, on
Shell 2 is screwed on flange part 5, and thus upper shell 2 is fixed on lower casing 3.In addition, bonding agent also can be used in upper shell 2
Lower casing 3 is fixed on Deng other fixing means.
Impeller 10 is fixed on the aftermentioned rotor 32 of motor 30, and rotates together with rotor 32.Later to impeller 10
Structure is illustrated.
Motor 30 has rotor 32.Rotor 32 is rotated centered on central axis P extended in the vertical direction.In detail
Say that when from axial top, rotor 32 is rotated counterclockwise centered on central axis P in ground.Rotor 32 is configured at
Axially top and the radial outside of stator 31.Rotor 32 is the cup-shaped of lower opening in the axial direction.In the radial outside of rotor 32
Configured with impeller 10, impeller 10 is fixed on rotor 32.It is configured with axis 33 in the radially inner side of rotor 32, axis 33 is fixed on rotor
32.Rotor magnet 36 is fixed in the radially inner side face of rotor 32.In the present embodiment, rotor magnet 36 is integrated ring-type
Magnet.In the face of the radially inner side of rotor magnet 36, circumferentially alternating magnetize the pole N and the pole S.But multiple magnet can also be with
The radially inner side face of rotor 32 is configured at instead of the ringshaped magnet of one.
Motor 30 also has stator 31, axis 33, bearing portion 34 and bearing cage 35.
Axis 33 is the columnar component configured along central axis P.The material of axis 33 is for example using metals such as stainless steels.Axis
33 upper axial end portion is located at than the bearing portion 34 of upside at the position of axial top.The upper axial end portion of axis 33 is along rotor
32 central axis P passes through the rotor hole penetrated through in the axial direction, and is fixed on rotor 32.
Bearing portion 34 can rotate the bearing of axis 33 centered on central axis P.In the present embodiment, bearing portion
34 quantity is two, and two bearing portions 34 are arranged above and below.Two bearing portions 34 are made of ball bearing.The quantity of bearing portion 34 with
And type can also change as appropriate.
Bearing cage 35 supports stator 31 in radial outside, and in radially inner side support shaft bearing portion 34.Bearing is kept
The material in portion 35 is for example using metals such as stainless steel and brass.But the material of bearing cage 35 is not limited to metal,
It can be resin.Bearing cage 35 is around central axis P along axial cylindrical extension.The axial direction of bearing cage 35
Lower end is inserted into the circular hole centered on central axis P for being set to lower casing 3, and is fixed on lower casing 3.
Stator 31 is the armature that magnetic flux is generated according to driving current.Stator 31 has stator core, insulating part and line
Circle.
Stator core is magnetic substance.Stator core is the laminated body of such as electromagnetic steel plate.Stator core has circular
Core-back and multiple teeth.Core-back is fixed on the radial outer side of bearing cage 35.Multiple teeth are from core-back court
It is prominent to radial outside.Insulating part is insulator.The material of insulating part is for example using resin.Insulating part covers stator core extremely
Few a part, especially covering tooth.Coil includes the conducting wire that tooth is wound in across insulating part.
By supplying driving current to stator 31, rotating torques are generated between rotor magnet 36 and stator 31.Turn as a result,
Son 32 is rotated relative to stator 31.Thus, the impeller 10 for being fixed on rotor 32 is rotated centered on central axis P.In addition, figure
Motor 30 illustrated by 2 is the radial outside in stator 31 configured with the outer rotor motor of rotor 32.But motor 30 can also
To be the radially inner side in stator 31 configured with the inner-rotor type motor of rotor 32.
Circuit board 40 is electrically connected with motor 30.Circuit board 40 is by the axial lower support of motor 30.Circuit board 40 is configured at
In the substrate receiving portion 4 of lower casing 3.Circuit board 40 is generally perpendicularly matched between lower casing 3 and stator 31 with central axis P
It sets.Circuit board 40 is for example fixed on insulating part.It is equipped in circuit board 40 for the electric circuit to coil supply driving current.
The end of conducting wire included in coil is electrically connected with the terminal for being set to circuit board 40.
Next, being illustrated to the structure of impeller 10.Fig. 3 is the perspective view of the impeller 10 from axial top.Fig. 4 is
The partial sectional view of centrifugal fan 100 involved in illustrative embodiment.
As shown in Figure 3 and 4, impeller 10 has multiple blade parts 13, upper shield 15 and lower shield 17.Also, leaf
Wheel 10 also has hub 11 and wall portion 19.In the present embodiment, hub 11, multiple blade parts 13, upper shield 15, lower shield 17
And wall portion 19 is the component formed by identical resin material.
Hub 11 is cylindrical in shape, and is fixed on rotor 32.In the present embodiment, hub 11 is cylindrical, and in motor 30
Axial top be fixed on the radial outer side of rotor 32.Hub 11 is for example fixed on rotor 32 and being pressed into or being bonded.In detail
It carefully says, hub 11 has the protruding portion held in the axial direction to radially inner side annular shape outstanding.The protruding parts are in rotor 32
Axial top.Protruding portion is for example balanced the counterweight component of adjustment and is arranged in order to configure.But, however it is not limited to it should
It illustrates, protruding portion can also be not provided with.In the case where being not provided with protruding portion, impeller 10 can also only be fixed on rotor 32
Radial outer side.
Hub 11 is configured to be overlapped with blade part 13 and rotor 32 radially.The lower axial end and hub of rotor 32
11 lower axial end is located at than the lower axial end of blade part 13 at the position of axial top.Moreover, the axial length of hub 11
The axial length whole less than impeller 10.By these, centrifugal fan 100 is thinned.
Multiple blade parts 13 are circumferentially configured across interval in the radial outside of hub 11, and are prolonged towards radial outside
It stretches.In the present embodiment, blade part 13 is opposite with hub 11 across gap radially.But blade part 13 can also be with
It is contacted with hub 11.In plan view, blade part 13 is tilted to the direction opposite with the direction of rotation of centrifugal fan 100, and
And extend towards radial outside in radial line.In addition, the direction of blade part 13 extended to radial outside is not limited to this, leaf
The a part of of piece portion 13 can extend to direction identical with direction of rotation, or can also extend vertically with direction of rotation.
Also, in the present embodiment, multiple blade parts 13 configure at equal intervals in the circumferential, but not necessarily configure at equal intervals.
Upper shield 15 is annular in shape, and connects at least part of the axial top of multiple blade parts 13.In present embodiment
In, upper shield 15 is the truncated cone shape that bore becomes smaller with the axial top of direction, and connects the axial direction of multiple blade parts 13
Upper end.
Lower shield 17 is annular in shape, and connects at least part of the axial lower section of multiple blade parts 13.Lower shield 17 has
Rake 171 and flat part 172.Rake 171 is the truncated cone shape that bore becomes smaller with the axial top of direction, and with
The inclined downward in the axial direction towards radial outside.In detail, the radial outer side of the radial inner end Yu hub 11 of rake 171
Connection.Rake 171 extends from the connecting portion relative to axial inclined downward.By rake 171, from the edge air entry 2a
Flowed towards exhaust outlet 2b to the high efficiency air flow axially flowed into.Flat part 172 is annular in shape, from the radial outer end of rake 171
Portion continuously extends to radial outside.Flat part 172 connects the lower axial end portion of multiple blade parts 13, can will pass through rake
171 are directed to exhaust outlet 2b from axial direction to the radial air-flow for changing direction.
In the present embodiment, upper shield 15 is vertically connected with lower shield 17 by multiple blade parts 13.
Wall portion 19 is annular in shape, extends from upper shield 15 towards upper shell 2.In the present embodiment, in detail, wall portion 19
It is the cylindrical shape that top extends in the axial direction.The axial top of wall portion 19 is contained in the aftermentioned wall receiving portion 2c of shell 2.
Moreover, wall portion 19 is set to the position for leaning on radial outside than the aftermentioned plectane portion 22 of upper shell 2, and it is set to and compares upper shield
15 radial outer end leans on the position of radially inner side.
Next, being illustrated referring to Fig. 4, Fig. 5, Fig. 6 A~Fig. 6 B and Fig. 7 to the structure of upper shell 2.Fig. 5 is to show
The perspective view of the structural example of upper shell 2.Fig. 6 A is the bottom view for showing an example of aftermentioned axial valley 22a.Fig. 6 B is to show
The bottom view of other an examples of axial valley 22a.Fig. 7 is the perspective view for showing the other structures example of shell 2.In addition, in Fig. 5
In, the section in the following figure indicates the section of the line B-B along upper figure.In Fig. 7, the section in the following figure indicates the line C-C along upper figure
Section.Also, Fig. 5~Fig. 7 observes upper shell 2 from axial lower section.When therefore, from axial lower section, impeller 10 and
The direction of rotation of rotor 32 becomes the clockwise direction centered on central axis P.
Upper shell 2 has canister portion 21 and plectane portion 22.Also, upper shell 2 also has four corners 23 and wall receiving portion 2c.
Canister portion 21 is opposite with the upper shield of impeller 10 15 across the first gap radially.In detail, canister portion 21 exists
It is radially opposite with the axial top of upper shield 15 across the first gap of radial width dr.
Plectane portion 22 extends from the radial inner end of canister portion 21 to radially inner side.Plectane portion 22 is annular in shape, in the axial direction every
The second gap and it is opposite with the upper axial end portion of upper shield 15.In detail, the lower surface in plectane portion 22 in the axial direction across
The second gap of axial width da and it is opposite with the upper axial end portion of upper shield 15.
Plectane portion 22 has air entry 2a and axial valley 22a.Radially inner side in plectane portion 22 is provided with air entry 2a.
The radially inner side face in plectane portion 22 is top and radially inner side curved surface outstanding in the axial direction, with towards axial top and to radial direction
Outer expandable.The radially inner side face in plectane portion 22 is functioned as the horn mouth of air entry 2a.Axial valley 22a is in plectane portion
Top is recessed in the axial direction for 22 lower surface.
The air sucked from the air entry 2a of upper shell 2 circumferentially turns round it in shell 1 by the rotation of impeller 10
Afterwards, from the exhaust outlet 2b discharge being set between upper shell 2 and lower casing 3.Upper shield 15 and lower shield 17 are by efficiently
The air being introduced into shell 1 from air entry 2a is directed to exhaust outlet 2b to improve the fan efficiency of centrifugal fan 100.
Also, a part in the air-flow sent out from impeller 10 to radial outside be flowed into upper shell 2 and upper shield 15 it
Between.In detail, which is flowed into the first gap between upper shield 15 and the canister portion 21 of upper shell 2, and court
It is flowed to the second gap between the upper axial end portion and plectane portion 22 of upper shield 15.Here, the axial width da in the second gap
Expand at axial valley 22a.Therefore, the flow velocity of the air-flow in the second gap is flowed into below the axial direction of axial valley 22a
It reduces.That is, being reduced from the second gap to the flow velocity of the air entry 2a air-flow flowed out.Thus, in the air-flow and it is attracted to air entry
When air-flow in 2a collaborates, inhibit to generate turbulent flow.Thus, it is possible to inhibit to generate noise because of the generation of turbulent flow, and can press down
The air quantity for making the air-flow being attracted in air entry 2a reduces.Therefore, it is capable of providing the centrifugation that Diffusion performance is excellent and noise is small
Fan 100.
Here, axial valley 22a can also be configured in the circumferential as Fig. 6 A it is multiple.It according to this structure, can be in week
Unbiased important place obtains the said effect for inhibiting that turbulent flow is generated at air entry 2a upwards.Also, in each axial valley 22a
Portion stops the circumferential flow of air-flow by the circumferential medial surface of axial valley 22a.Therefore, the flow velocity of the air-flow in the circumferential
It reduces.Thus, it is possible to more reduce from the second gap to the flow velocity of the air entry 2a air-flow flowed out.
Moreover, preferably axially recess portion 22a matches at equal intervals in the circumferential in the case where being provided with multiple axial valley 22a
It sets.By configuring multiple axial valley 22a at equal intervals, said effect can be obtained in unbiased important place in the circumferential.But it is and unlimited
Due to the illustration, multiple axial valley 22a can also be configured with unequal interval, that is, can also be in the circumferential with unequal interval
Configuration.
Alternatively, axial valley 22a can also as shown in fig 6b from end on observation when it is annular in shape.According to this structure, Neng Gou
Unbiased important place obtains the said effect for inhibiting that turbulent flow is generated at air entry 2a in circumferential direction.Thus, it is possible to more reduce from second
Flow velocity of the gap to the air entry 2a air-flow flowed out.
Also, it is preferred that axial width da of the radial width dr in the first gap less than the second gap.In detail, preferred cartridge
The first gap-ratio plectane portion 22 between portion 21 and upper shield 15 and the second gap between the upper axial end portion of upper shield 15 are narrow.
For example, the tolerance ratio of the axial dimension for being configured at axial all parts of lower casing 3, impeller 10 and upper shell 2 etc is matched
The radial dimension of tolerance for being placed in radial all parts is big, but according to above-mentioned structure, can utilize the axis in the second gap
It mitigates or eliminates to width da.It, can be not make the mouth radially of air entry 2a also, by making the first gap become narrower
Diameter, which becomes too narrow mode, ensures the radial width dr in the first gap.
Next, canister portion 21 has multiple radial lugs 211.Radial lugs 211 canister portion 21 radially inner side towards diameter
It protrudes inwardly, and axially extends.
It is preferred that multiple radial lugs 211 configure at equal intervals in the circumferential.It, can by configuring radial lugs 211 at equal intervals
Unbiased important place obtains the reduced said effect of the generation and air quantity that further suppress noise in the circumferential.But it does not limit
In the illustration, multiple radial lugs 211 can also be configured with unequal interval, that is, can also be matched in the circumferential with unequal interval
It sets.By configuring multiple radial lugs 211 in the circumferential with unequal interval, upper shield 15 and radial lugs can be dispersed
211 audio frequencies interfered by the rotation of impeller 10 inhibit to generate noise.
Preferably radially the upper axial end portion of protrusion 211 is connect with the lower surface in plectane portion 22.It according to this structure, can be in week
The second gap delimited by radial lugs 211 upwards.Therefore, it can be flowed in the second gap by the inhibition of radial lugs 211
The circumferential flow of air-flow.Thus, it is possible to further decrease the flow velocity from the second gap to the air entry 2a air-flow flowed out.
Also, axial valley 22a is overlapped configuration with radial lugs 211 in the circumferential.It according to this structure, can will be in axial direction
The effect and inhibit to flow in the second gap by radial lugs 211 that the axial lower section of recess portion 22a declines the flow velocity of air-flow
The effect of circumferential flow of air-flow be combined.By the combination, can more efficiently reduce from the second gap to air-breathing
The flow velocity of the air-flow of mouth 2a outflow.
Also, preferably radially the upper axial end portion of protrusion 211 is accommodated in axial valley 22a.It is further preferably radial
The upper axial end portion of protrusion 211 is connect with the inner bottom surface towards axial lower section of axial valley 22a.According to this structure, Neng Goutong
Cross the circumferential flow for the air-flow that radial lugs 211 inhibit in axial valley 22a.Thus, it is possible to effectively further reduce from
Flow velocity of two gaps to the air entry 2a air-flow flowed out.Moreover, upper axial end portion and axial valley by radial lugs 211
The inner bottom surface of 22a connects, and can inhibit the circumferential flow of the air-flow in axial valley 22a by radial lugs 211, and can
Improve the intensity of radial lugs 211.But it is not limited to the illustration, the upper axial end portion of radial lugs 211 can be with axial direction
The inner bottom surface of recess portion 22a does not contact, and can not also be contained in axial valley 22a.
When from end on observation, as shown in figure 5, the direction of rotation relative to impeller 10, behind the direction of rotation of radial lugs 211
Side be preferably with towards radially inner side and towards the inclined surface of Rdf on front side of direction of rotation or be directed towards radially inner side and
Rdb flexure plane outstanding on rear side of direction of rotation.
It is inclined surface or bending as described above in the direction of rotation trailing flank of radial lugs 211 in analog result
The noise ratio generated in the case where face is the case where the direction of rotation trailing flank of radial lugs 211 is with radial parallel plane
It is small.In the case that in the direction of rotation, trailing flank is inclined surface or flexure plane, with the direction of rotation trailing flank be with it is radial parallel
Plane the case where compare, be able to suppress the variation that rapid flow occurs at the periphery of radial lugs 211 for air-flow.Thus, lead to
It crosses and direction of rotation trailing flank is set as inclined surface or flexure plane as described above, can further suppress and be produced because generating turbulent flow
The air quantity of raw noise and the air-flow being attracted in air entry 2a reduces.
But it is not limited to the illustration, when from end on observation, as shown in fig. 7, behind the direction of rotation of radial lugs 211
Side is also possible to direction of rotation and radial parallel plane about impeller 10.
The corner 23 extended to radial outside is provided in the radially outer end of canister portion 21.In the present embodiment, corner
23 are fixed on flange part 5.
Also, the wall receiving portion 2c for accommodating wall portion 19 is provided in the lower surface of upper shell 2.Wall receiving portion 2c is annular in shape,
And top is recessed in the axial direction.As shown in figure 4, wall receiving portion 2c is set to than plectane portion 22 at the position of radial outside.According to
The structure can be since wall receiving portion 2c and wall portion 19 are set to than plectane portion 22 at the position of radial outside
Providing walls 19 is contained in the cricoid labyrinth structure in wall receiving portion 2c in gap between upper shield 15 and upper shell 2.Cause
And it can reduce the air quantity of the air-flow in the first gap by radial width dr.
Also, as shown in figure 4, wall receiving portion 2c is set to the position for leaning on radially inner side than the radial outer end of upper shield 15
Place.That is, wall receiving portion 2c and wall portion 19 are set to the radial outer end than upper shield 15 at the position of radially inner side.Therefore,
Air-flow is not easy in the gap being flowed between upper shield 15 and upper shell 2.Thus, it is possible to be further lowered through the gap to suction
The air quantity of the air-flow of port 2a outflow.
Various technical characteristics disclosed in the present specification can carry out in the range of not departing from its technological innovation purport
Various changes.Also, multiple embodiments and variation shown in the present specification can also within the bounds of possibility into
Row combination is to implement.
The present invention can be used in such as air-conditioning, smoke exhaust fan, the effective ventilation fan of ventilation, heat exchange unit, printing
Centrifugal fan used in paper adsorption of device etc..
Claims (11)
1. a kind of centrifugal fan comprising:
Motor, the rotor rotated centered on the central axis of extension under the motor has above；
Impeller, the impeller is fixed on the rotor, and rotates together with the rotor；
Circuit board, the circuit board are electrically connected with the motor；And
Shell, the shell accommodate the motor, the impeller and the circuit board,
The impeller includes
Multiple blade parts, the multiple blade part are configured across gap in the circumferential, and are extended towards radial outside；
Cricoid upper shield, the upper shield connect at least part of the axial top of multiple blade parts；And
Cricoid lower shield, the lower shield connect at least part of the axial lower section of multiple blade parts,
The shell has the upper shell for the axial top for covering the impeller,
The centrifugal fan is characterized in that,
The upper shell includes
Canister portion, cartridge are opposite with the upper shield across the first gap；And
Cricoid plectane portion, the plectane portion extend from cartridge to radially inner side, and in the axial direction across the second gap
And it is opposite with the upper axial end portion of the upper shield,
Radially inner side in the plectane portion is provided with air entry,
The plectane portion has the lower surface axial valley that top is recessed in the axial direction in the plectane portion.
2. centrifugal fan according to claim 1, which is characterized in that
The axial valley is configured with multiple in the circumferential.
3. centrifugal fan according to claim 1, which is characterized in that
It is annular in shape when the axial valley is from end on observation.
4. centrifugal fan as claimed in any of claims 1 to 3, which is characterized in that
Cartridge has multiple radial lugs, and the multiple radial lugs are prominent towards radially inner side in radially inner side, and
It axially extends,
The upper axial end portion of the radial lugs is connect with the lower surface in the plectane portion.
5. centrifugal fan according to claim 4, which is characterized in that
When from end on observation, relative to the direction of rotation of the impeller, the direction of rotation trailing flank of the radial lugs be with
Towards radially inner side towards the inclined surface on front side of direction of rotation or it is directed towards on rear side of radially inner side and direction of rotation and protrudes
Flexure plane.
6. centrifugal fan according to claim 4 or 5, which is characterized in that
Multiple radial lugs configure at equal intervals in the circumferential.
7. the centrifugal fan according to any one of claim 4 to 6, which is characterized in that
The axial valley is overlapped configuration with the radial lugs in the circumferential.
8. centrifugal fan according to any one of claims 4 to 7, which is characterized in that
The upper axial end portion of the radial lugs is contained in the axial valley.
9. centrifugal fan as claimed in any of claims 1 to 8, which is characterized in that
The radial width in first gap is less than the axial width in second gap.
10. centrifugal fan as claimed in any of claims 1 to 9, which is characterized in that
The impeller also has cricoid wall portion, and the wall portion extends from the upper shield towards the upper shell,
It is provided in the lower surface of the upper shell and accommodates the wall portion and the in the axial direction cricoid wall receiving portion of top recess,
The position that radial outside is leaned on than the plectane portion is arranged in the wall portion and the wall receiving portion.
11. centrifugal fan according to claim 10, which is characterized in that
The wall portion and the wall receiving portion are additionally arranged at the position that radially inner side is leaned on than the radial outer end of the upper shield.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-041586 | 2018-03-08 | ||
| JP2018041586A JP2019157656A (en) | 2018-03-08 | 2018-03-08 | Centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110242598A true CN110242598A (en) | 2019-09-17 |
Family
ID=67844498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910154478.2A Pending CN110242598A (en) | 2018-03-08 | 2019-03-01 | Centrifugal fan |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20190277309A1 (en) |
| JP (1) | JP2019157656A (en) |
| CN (1) | CN110242598A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112555195A (en) * | 2019-09-26 | 2021-03-26 | 日本电产株式会社 | Centrifugal fan |
| CN114483649A (en) * | 2021-12-29 | 2022-05-13 | 德安县塑丽龙纺织有限公司 | Drying device for textile product production |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019116848A (en) * | 2017-12-26 | 2019-07-18 | 日本電産株式会社 | Centrifugal fan |
| JP2019116847A (en) * | 2017-12-26 | 2019-07-18 | 日本電産株式会社 | Centrifugal fan |
| US10975879B2 (en) * | 2018-07-18 | 2021-04-13 | The Charles Machine Works, Inc. | Centrifugal fan |
| CN111734684B (en) * | 2020-07-07 | 2021-10-29 | 江西乐富军工装备有限公司 | Heat radiation module of electric or electronic device |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20190277309A1 (en) | 2019-09-12 |
| JP2019157656A (en) | 2019-09-19 |
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Application publication date: 20190917 |