阅读说明：本技术 一种风机及吸尘器 (Fan and dust collector ) 是由 檀冲 魏秋红 严涛 赵海洋 郭保东 于 2019-09-04 设计创作，主要内容包括：本申请提供了一种风机及吸尘器,该风机包括壳体；风机骨架,安装于壳体内,包括第一配合部；定子组件和转子组件,安装于所述风机骨架上；所述壳体包括第二配合部,第二配合部能够与第一配合部接合。该风机能够使壳体筒体和风机骨架的中心柱在轴向上对齐,增大了进风面积,减小了风阻,提升了风机的性能。(The application provides a fan and a dust collector, wherein the fan comprises a shell; the fan framework is arranged in the shell and comprises a first matching part; the stator assembly and the rotor assembly are arranged on the fan framework; the housing includes a second mating portion engageable with the first mating portion. This fan can make the central post of casing barrel and fan skeleton align in the axial, has increased the air inlet area, has reduced the windage, has promoted the performance of fan.)

1. A blower, comprising:

A housing;

The fan framework is arranged in the shell and comprises a first matching part;

The stator assembly and the rotor assembly are arranged on the fan framework;

The housing includes a second mating portion engageable with the first mating portion.

2. The blower of claim 1, wherein the blower skeleton comprises an impeller shroud, a first bearing block, a second bearing block, and a center post connected to one another, the first mating portion being located on the second bearing block.

3. the blower of claim 2, wherein the housing includes a barrel, a mount, and a mounting beam connecting the barrel and the mount, the second mating portion being located on the mount.

4. the fan of claim 1, wherein the first mating portion is formed as a groove and the second mating portion is formed as a bump.

5. The fan of claim 1, wherein the first mating portion is formed as a tab and the second mating portion is formed as a groove.

6. the fan of claim 1, wherein a first impeller shroud end of the impeller shroud distal from the center post is circumferentially provided with a step that engages the guide impeller to effect connection of the fan frame to the guide impeller.

7. The fan of claim 5 wherein the grooves are filled with an adhesive.

8. the fan of any of claims 1 to 4, wherein the housing comprises at least one air inlet between the end wall and the side wall of the housing, the air inlet having an opening shaped as an inwardly concave scoop to allow air to enter the housing in multiple directions.

9. The blower of claim 8, wherein the housing comprises: the air inlet structure comprises a cylinder body, a mounting seat and a mounting beam, wherein the mounting beam is connected with the cylinder body and the mounting seat, and the cross section of the mounting seat is formed into a polygonal shape with at least one side being concave, so that the at least one air inlet is formed between the mounting seat and the cylinder body.

10. A vacuum cleaner, characterized in that it comprises a fan according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of dust collectors, in particular to a fan and a dust collector comprising the fan.

Background

The fan consists of a stator component and a rotor component. The stator assembly comprises a stator core, a stator framework, an impeller cover, a guide impeller and the like. The rotor assembly includes a bearing, a rotor core, a permanent magnet, and an impeller. A certain relative positional relationship, such as concentricity, should be maintained between the rotating rotor assembly and the stationary stator assembly, which is more important in high speed fans. In addition, the cooling effect on the fan components will directly affect the efficiency, weight and life of the fan. And because the positional relationship between the stator assembly and the rotor assembly of the fan is not accurate, the air inlet area is reduced, and the wind resistance is increased.

Disclosure of Invention

To the problem among the above-mentioned prior art, this application has provided a fan and has contained dust catcher of this fan, and it sets up the opening through the terminal surface at the second bearing room, and this opening is used for fixing a position the casing, makes the center post of casing barrel and fan skeleton align in the axial, has increased the air inlet area, has reduced the windage, has promoted the performance of fan.

In a first aspect, the present application provides a wind turbine comprising a housing; the fan framework is arranged in the shell and comprises a first matching part; the stator assembly and the rotor assembly are arranged on the fan framework; the housing includes a second mating portion engageable with the first mating portion. This fan can make the central post of casing barrel and fan skeleton align in the axial, has increased the air inlet area, has reduced the windage, has promoted the performance of fan.

In one embodiment of the first aspect, the housing includes a cylinder, a mount, and a mounting beam connecting the cylinder and the mount, and the second mating portion is located on the mount.

In one embodiment of the first aspect, the first fitting portion is formed as a groove, and the second fitting portion is formed as a projection.

In one embodiment of the first aspect, the first fitting portion is formed as a projection, and the second fitting portion is formed as a groove.

In an embodiment of the first aspect, a step portion is circumferentially provided at an end of the impeller housing away from the center column, and the step portion is engaged with the guide impeller to connect the fan frame and the guide impeller.

In one embodiment of the first aspect, the trench is filled with an adhesive.

In one embodiment of the first aspect, the housing includes at least one air scoop positioned between the end wall and the side wall of the housing, the opening of the air scoop being shaped as an inwardly concave scoop to allow air to enter the housing in multiple directions.

In one embodiment of the first aspect, the housing comprises: the air inlet structure comprises a cylinder body, a mounting seat and a mounting beam, wherein the mounting beam is connected with the cylinder body and the mounting seat, and the cross section of the mounting seat is formed into a polygonal shape with at least one side being concave, so that the at least one air inlet is formed between the mounting seat and the cylinder body.

In a second aspect, the present application provides a vacuum cleaner comprising the fan of the first aspect and embodiments thereof.

The fan and the dust collector comprising the fan have the advantages that compared with the prior art, the fan and the dust collector comprising the fan at least have the advantages that:

(1) through set up first cooperation portion and second cooperation portion respectively on casing and fan skeleton, can make casing and fan skeleton joint to make casing and center post align in the axial, increased the air inlet area, reduced the windage, promoted the performance of fan.

(2) the shell is provided with a multi-directional air inlet, and the air inlet enables air entering the shell to blow to the stator assembly along a substantially linear direction and blow to the rotor assembly and the fan framework along a substantially radial direction, so that the cooling effect is further enhanced, and the performance of the fan is improved; (ii) a

(3) The wall of the air inlet is at least composed of a section of arc surface, so that air flow smoothly enters the fan, and wind noise is reduced.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

Drawings

the invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 shows a schematic structural diagram of a wind turbine according to an embodiment of the present invention;

FIG. 2 shows a schematic view of an explosive structure of a wind turbine according to an embodiment of the invention;

FIG. 3 shows a schematic structural view of a rotor assembly according to an embodiment of the present invention;

FIGS. 4 and 5 show perspective views of a wind turbine skeleton according to an embodiment of the present invention;

FIG. 6 shows a schematic structural diagram of a wind turbine skeleton according to an embodiment of the invention;

3 FIG. 3 7 3 illustrates 3 a 3 cross 3- 3 sectional 3 view 3 of 3 the 3 blower 3 skeleton 3 of 3 the 3 embodiment 3 of 3 the 3 present 3 invention 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 6 3; 3

FIG. 8 illustrates a top view of a wind turbine skeleton according to an embodiment of the present disclosure;

FIG. 9 shows a schematic structural view of a stator assembly according to an embodiment of the invention;

FIG. 10 shows a schematic structural view of a stator element according to an embodiment of the invention;

Fig. 11 shows a schematic structural view of a stator core according to an embodiment of the present invention;

FIG. 12 shows a perspective view of a housing according to an embodiment of the invention;

FIG. 13 shows a schematic view of the assembly of a housing according to an embodiment of the invention;

FIG. 14 shows a top view of a housing according to an embodiment of the invention;

FIG. 15 shows a cross-sectional view of a blower according to an embodiment of the invention taken along line I-I of FIG. 1;

Fig. 16 shows a partial enlarged view of region D in fig. 15 according to an embodiment of the present invention.

List of reference numerals:

100-a fan; 110-a housing; 111-a cylinder; 112-a mount; 113-mounting a beam; 1121-mounting holes; 1122-alignment bumps; 1111-air inlet; 114-a bump; 120-a fan framework; 121-impeller shroud; 1211-skeleton wind-guiding surface; 1212-a trench; 1213-step portion; 122-a first bearing seat; 123-a second bearing seat; 1231-alignment groove; 124-a central column; 124A-side column; 124C — first side rib; 124D-second side rib; 125-fitting openings; 127-a positioning member; 128-reinforcing ribs; 130-a stator assembly; 131-a stator element; 132-a stator core; 1321-a winding portion; 1321' -a third arc surface; 1322-a first tooth; 1323-a second tooth; 1324-a first extension; 1324' a first arc surface; 1325-a second extension; 1325' -a second arc surface; 1326-a first projection; 1327-a second projection; 133-a bobbin; 1331-a first spool; 1332-a second bobbin; a fourth arc surface 1322'; a fifth circular arc surface 1323'; 134-winding; 140-a rotor assembly; 141-a rotating shaft; 142-a permanent magnet; 143-a first bearing; 144-a second bearing; 145-impeller; 146-a sensor magnet; 150-guide impeller.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

Fig. 1 and 2 are an assembly schematic view and an explosion schematic view of a wind turbine 100 according to the present invention, respectively. As shown in fig. 1, the wind turbine 100 includes a housing 110, a wind turbine frame 120, a stator assembly 130, a rotor assembly 140, and a guide vane 150. In the assembled blower 100, the guide impeller 150 is attached to one side of the blower skeleton 120, the housing 110 is mounted around the exterior of the other side of the blower skeleton 120, the rotor assembly 140 is positioned inside the blower skeleton 120 and mounted to the blower skeleton 120, and the stator assembly 130 is mounted within the plurality of openings of the blower skeleton 120 to surround the rotor assembly 120.

as shown in fig. 3, the rotor assembly 140 includes a rotating shaft 141, a permanent magnet 142 circumferentially arranged around the rotating shaft 141, a pair of balancing rings positioned at both sides of the permanent magnet 142, a first bearing 143, a second bearing 144, and an impeller 145. The first and second bearings 143 and 144 are installed on the rotating shaft 141, and the permanent magnet 142 and the balancing rings are on both sides, i.e., outside of a pair of balancing rings, respectively. The impeller 145 is fixedly provided at one end of the rotating shaft 141, and the sensor magnet 146 is installed at the other end of the rotating shaft 141.

When the rotor assembly 140 is installed inside the blower skeleton 120, the first bearing 143 is located in the first bearing seat 122 of the blower skeleton 120 corresponding thereto, and the second bearing 144 is located in the second bearing seat 123 of the blower skeleton 120 corresponding thereto.

The connection between the bearing and the corresponding bearing seat can be realized here in various ways, for example by means of an adhesive connection, a snap connection or a screw connection. In this embodiment, the second bearing seat 123 is fixedly connected to the second bearing 144, preferably, fixed by an adhesive, so as to absorb an axial force, thereby preventing axial movement, enabling the fan to maintain good performance when rotating at a high speed, and prolonging the service life of the fan. In the present embodiment, the first bearing seat 122 is flexibly mounted with the first bearing 143, and preferably, the inner surface of the first bearing seat 122 is coated with rubber, so as to effectively bear and absorb the radial force suffered by the motor during operation.

As shown in fig. 4-8, the blower skeleton 120 may include an impeller shroud 121, a first bearing housing 122, a second bearing housing 123, and an elongated center post 124 for receiving at least one stator element 131 of a stator assembly 130. In describing the fan frame 120 of the present application, it is defined that the side adjacent to the impeller shroud is up and the opposite side is down. A first bearing seat 122 and a second bearing seat 123 are formed at both ends of an elongated center column 124 in the axial direction. The elongated center post 124 includes a plurality of side posts 124A extending in an axial direction, a fitting opening 125 is formed between adjacent two side posts 124A to receive the stator element 131, and an alignment groove 1231 is formed at the second bearing seat 123 of the center post 124, through which the housing 110 is engaged (to be described later in detail).

In an embodiment of the present invention, as shown in fig. 4, each side post 124A includes side ribs on both sides, a first side rib 124C and a second side rib 124D, which extend along the length direction of the side post.

Preferably, at least one pair (preferably four in the present embodiment) of side pillars 124A are disposed around the center pillar 124 at equal intervals, and two opposite side pillars 124A are symmetrical about the rotation axis, and a fitting opening 125 is formed between the adjacent two side pillars 124A. That is, in the present embodiment, four fitting openings 125 are formed on a sidewall of the center post 124 to receive four stator elements 131, respectively, the four stator elements 131 collectively constituting the stator assembly 130 of the present invention.

preferably, in the assembly opening 125, a positioning member 127 extending in the axial direction is disposed on the first side rib 124C near the first bearing seat 122 to define an axial installation position of the stator element 131, so that the stator element 131 coincides with an axial center of the permanent magnet 142, that is, the axis of the stator element 131 coincides with the axis of the permanent magnet 142, thereby reducing a magnetic pulling force generated due to the misalignment, and achieving an effect of reducing noise.

preferably, after the stator element 131 is positioned by the fan frame 120 and the positioning member 127, the stator element 131 is stuck to the fan frame 120 and the stator element 131 is stuck to the positioning member 127 by using an adhesive, so that the stator element 131 is prevented from moving outwards to affect the structural stability.

More preferably, in two opposite assembling openings 125 symmetrically distributed, positioning members 127 of the same gauge and height are provided in the side ribs close to the first bearing seats 122 to define the axial mounting position of the stator elements 131 in the respective assembling openings 125.

most preferably, positioning members 127 of the same gauge and height are provided on all the side ribs of the central column 124, so as to define in the most precise manner the axial mounting positions of all the stator elements 131 in all the assembly openings 125.

Preferably, in one embodiment of the present invention, the positioning member 127 is configured as a limit projection extending in the axial direction.

In a preferred embodiment of the present invention, at least one pair of ribs 128 are used to connect and reinforce between impeller cup 121 and first bearing seat 122. The ribs 128 are positioned at the non-opening of the center post 124 to reduce the obstruction of the incoming air for maximum cooling.

Preferably, the stiffener 128 is positioned at the second side rib 124D of the fitting opening 125 and is axially aligned with the second side rib 124D, in other words, the stiffener 128 is an extension of the second side rib 124D in the axial direction, thereby minimizing the wind resistance caused thereby and reducing the turbulence and noise in the fan 100.

More preferably, one reinforcing rib 128 is provided on each side pillar 124A such that a plurality of reinforcing ribs 128 are equally spaced around the circumference of the center pillar 124.

Preferably, the thickness h of the ribs 128 is as shown in FIG. 5₁should be less than or equal to the thickness h of the second side rib 124D₂In order to reduce wind resistance.

In order to further reduce the wind resistance, the reinforcing rib 128 and the side ribs in the invention are provided with smooth surfaces, and the surface of the reinforcing rib 128 is an arc surface, and the two are in arc surface transition at the joint. The fan frame 120 is of an integral structure, that is, the fan frame 120 is used as an integral part during assembly, wherein the impeller cover 121, the first bearing seat 122, the second bearing seat 123 and the arc surface of the side column 124A for installing and positioning the stator core element maintain high coaxiality, so that the stator assembly 130 and the rotor assembly 140 of the fan 100 maintain high coaxiality, and the accumulated error and the increase of volume and weight caused by the split design are reduced.

a guide impeller 150 is fixed above the impeller housing 121, and the guide impeller 150 can guide the air flow in a desired direction. Further, as clearly shown in fig. 6, in the embodiment of the present application, a step portion 1213 is circumferentially provided above the impeller housing 121, and an outer diameter of the step portion 1213 is slightly larger than an inner diameter of the guide impeller, so that the guide impeller 150 can be in an interference fit with the impeller housing 121, thereby achieving a fixed connection of the fan frame 120 and the guide impeller 150, but the present application is not limited thereto, and the guide impeller may be connected with the impeller housing by other means, for example, the guide impeller may be fixedly connected to the impeller housing by an adhesive, as long as a fixed sealing connection between the guide impeller and the impeller housing can be achieved.

In addition, in one embodiment, a first mating portion is disposed on a circumference of the second bearing seat 123, and the first mating portion is configured to be engaged with a first mating portion disposed on the casing 110, so as to achieve alignment and assembly of the casing 110 and the fan frame 120, and limit rotation of the casing 110 relative to the fan frame 120 about the rotation axis.

Hereinafter, the stator assembly 130 will be described in detail with reference to fig. 9 to 11.

Fig. 9 is a schematic view of the stator elements 131 of the stator assembly 130 evenly arranged around the permanent magnets, and in a preferred embodiment of the present invention, the stator assembly 130 includes four stator elements 131. Fig. 10 is a schematic view of one of the stator elements 131 of the stator assembly 130 of the present invention. As shown in fig. 9, the stator element 131 includes a stator core 132, a bobbin 133, and windings 134, wherein the bobbin 133 (composed of a first bobbin 1331 and a second bobbin 1332 as shown in fig. 10) is detachably fixed to the stator core 132 to enable the windings 134 to form a stator coil around the bobbin 133 (or the stator core 132).

Fig. 11 is a schematic structural view of the stator core 132. The stator core 132 has a "pi" shaped structure formed by a winding portion 1321, a first tooth 1322, and a second tooth 1323 parallel to each other. In which the winding portion 1321 may be formed to protrude along left and right sides or at the rear, it is preferable herein that the winding portion 1321 is formed to extend along left and right sides, forming the first and second extensions 1324 and 1325. At least one of the first circular arc surface 1324 ' and the second circular arc surface 1325 ' of the first extension portion 1324 and the second extension portion 1325 has the same radius of curvature as the third circular arc surface 1321 ' of the winding portion inner side surface therebetween. And the first circular arc surface 1324 'and the second circular arc surface 1325' are attached to the top surface of the side rib of the side column 124A of the fan frame 120 (which has the same curvature as the first circular arc surface and the second circular arc surface), so that the fourth circular arc surface 1322 'and the fifth circular arc surface 1323' of the end portions of the first tooth portion 1322 and the second tooth portion 1323 maintain high coaxiality with the rotor permanent magnet 142 mounted in the fan frame, and at the same time, the radial movement of the stator core 132 toward the permanent magnet 142 can be suppressed. The first tooth 1322 and the second tooth 1323 are respectively provided with a first protrusion 1326 and a second protrusion 1327 at the ends, the first protrusion 1326 protrudes from the inner wall of the first tooth 1322 toward the second tooth 1323, and the second protrusion 1327 protrudes from the inner wall of the second tooth 1323 toward the first tooth 1322.

As shown in fig. 11, the distance between the first extending portion 1324 and the first tooth 1322 is d1, and the distance between the second extending portion 1325 and the second tooth 1323 is d2, preferably, d1 is equal to d 2.

The stator core 132 has a laminated structure and is formed by laminating electrical silicon steel sheets using a tooling mold. The sheets may be fixed together by welding or by applying an adhesive.

Compared with the prior art that the stator core 132 is provided with the first extension portion 1324 and the second extension portion 1325, the stator core 132 provided by the invention has the advantages that the processing process is simpler, and meanwhile, the surface area of the stator core 132 exposed in the air is increased due to the arrangement of the extension portions, so that the heat dissipation is facilitated.

The structure of the stator assembly, the rotor assembly, and the blower frame are described in detail above, and in the present application, these components are all mounted in the blower housing. The fan housing of an embodiment of the present invention will be described in detail with reference to fig. 12 to 14. Fig. 12 is a schematic structural diagram of the housing 110 according to the present invention.

as shown, the housing 110 includes a cylinder 111, a mount 112, and a mount beam 113, the mount beam 113 connecting the cylinder to the mount 112, in other words, the mount beam 113 supporting the mount 112 away from the cylinder 111 such that an intake space is formed between the mount 112 and the cylinder 111. The cross section of the mounting seat is formed into a polygonal shape with at least one concave side. Thus, an inwardly concave scoop-shaped air intake 1111 may be formed between the mounting seat and the barrel, the arrangement of this shape may allow wind to enter the housing in multiple directions. In the present embodiment, the mounting seat is formed in a quadrangular shape with concave edges. Specifically, the mounting beams 113 are arranged in plural (preferably in pairs, four in the present embodiment) along the circumferential direction of the mount 112 and the cylinder 111. One end of each mounting beam 113 is connected with the cylinder 111, the other end of each mounting beam 113 is connected with four corners of the mounting base 112, a protruding portion extending inwards along the radial direction of the mounting cylinder is formed at the end, connected with the mounting base, of each mounting beam 113, the diameter of the circumscribed circle of the mounting base is smaller than the outer diameter of the mounting cylinder, and therefore multidirectional air inlets 1111 distributed along the circumferential direction are formed between the mounting base 112 and the cylinder 111 of the shell 110. The air inlet enables air entering the shell to blow towards the stator assembly along the approximate linear direction and blow towards the rotor assembly and the fan framework along the approximate radial direction. In other embodiments, the mounting beam 113 may also extend out of the mounting seat 112 along the axial direction of the cylinder, and the extended portion may be used to support components of the circuit board, so that an air inlet space may be formed between the circuit board and the mounting seat 112 to cool the circuit board.

Preferably, as shown in fig. 13, the edge of the mounting seat 112 forming the air inlet is of a circular arc structure, and the edge of the cylinder forming the top of the air inlet is also of a circular arc structure, so that the air flow can smoothly enter the fan 100, and the noise is reduced while cooling the device.

in fig. 13, in a preferred embodiment of the present invention, a mounting hole 1121 is centrally provided on the mounting base 112, and the second bearing base 123 of the fan frame 120 is engaged with the mounting hole 1121 when the fan 100 of the present application is assembled. As described above, the inner side wall of the mounting hole 1121 is provided with a second engaging portion, and the second engaging portion can be engaged with the first engaging portion disposed on the circumference of the second bearing seat 123 of the fan frame 120, so as to achieve the aligned assembly of the housing 110 and the fan frame 120. Further, in an embodiment, an alignment bump 1122 (see fig. 13, that is, the alignment bump 1122 is provided on an inner side wall of the mounting hole 1121 of the housing 110), and the alignment bump 1122 is positioned on the inner side wall so as to be capable of being engaged with an alignment groove 1231 (see fig. 4, that is, the alignment groove 1231 is provided on the circumference of the second bearing seat 123 of the fan frame 120); in another embodiment, an alignment groove (not shown, that is, the second mating portion is an alignment groove) is disposed on an inner side wall of the mounting hole 1121 of the housing 110, and the alignment groove is positioned on the inner side wall to be capable of being engaged with an alignment protrusion (not shown, that is, the first mating portion is an alignment protrusion) formed on the circumference of the second bearing seat 123 of the fan frame 120; the first and second engagement portions in the above-described embodiment are configured to restrict the rotation of the housing 110 relative to the fan frame 120 about the rotation axis. Enabling the intake stack to be aligned with the stator assembly 130 inside the blower 100 to further enhance the cooling effect.

A projection 114 is provided along a circumferential direction at one end of the housing 110 where the mounting beam and the mounting seat are not provided, and correspondingly, a groove 1212 (fig. 7) is provided along a circumferential direction at a lower portion of the impeller cup 121 of the blower frame 120. Further positioning of the housing 110 and fan frame 120 is achieved by inserting the projections 114 into the channels 1212 when assembling the fan 100. That is, the positioning assembly of the housing 110 and the fan frame 120 can be more conveniently realized by the engagement of the protrusion 114 and the groove 1212 and the engagement of the alignment protrusion 1122 and the alignment groove 1231.

During positioning and assembling, in order to ensure the working performance of the fan 100, sealing requirements are met when partial parts are installed. The housing 110 and fan frame 120, as used herein, are mounted to ensure that air flow cannot escape therefrom. A certain amount of adhesive can be added into the groove 1212, and when the protrusion 114 is pushed in, the adhesive will overflow along the inner wall and the outer wall of the protrusion 114, so that the inner wall and the outer wall both form a complete sealing film to achieve the effect of double-layer sealing, and the air flow path according to the embodiment of the present invention will be described in detail with reference to fig. 15 and 16.

in fig. 15, a part of the air flow enters the inside of the fan 100 from the outside of the air inlet 1111 of the present invention, passes through the stator assembly 130 in the axial direction to reach the skeleton air guiding surface 1211 on the inside of the impeller cover 121, and the skeleton air guiding surface 1211 is formed by at least two sub-arc surfaces (as shown in fig. 16), thereby forming a smooth air flow guiding path. The frame air guide surface 1211 has an aerodynamic shape, and effectively reduces wind resistance and reduces turbulence and noise in the fan.

On the other hand, a part of the air flow enters the interior of the fan 100 from the air inlet of the present invention, passes through the balance ring, the permanent magnet 142, the stator assembly 140, and finally is discharged from one end of the assembly opening 125 close to the impeller. Since this wind will pass through almost all of the heat generating components, a large portion of the heat within fan 100 is carried away. While, as noted above, in the preferred embodiment herein, the ribs 128 are positioned in axial alignment with the side ribs, the ribs 128 have a thickness h1 that is less than or equal to the thickness h2 of the side ribs, which minimizes wind resistance to the air flow exiting the fan, thereby reducing turbulence and noise within the fan.

Compared with the heat dissipation mode that the shell is provided with the holes in the prior art, the shell is provided with the multi-directional air inlet, and the air inlet enables air entering the shell to blow to the stator assembly along a substantially linear direction and blow to the rotor assembly and the fan framework along a substantially radial direction, so that the cooling effect is further enhanced, the performance of the fan is improved, and the service life of the fan is prolonged; the edge of the air inlet is at least formed by a section of arc surface, so that air flow smoothly enters the fan, and wind noise is reduced.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.