CN211674010U - Air duct assembly, electric fan and dust collector - Google Patents

Abstract

The utility model provides a wind channel subassembly, electric fan and dust catcher, the wind channel subassembly includes: the fan cover is provided with an accommodating cavity; the rotor assembly is arranged in the accommodating cavity and comprises a movable fan blade and a bearing; the static fan blade is in contact with the fan cover in the axial direction, and a matching surface is arranged on the static fan blade; the bulge is arranged on one of the end surface and the matching surface of the fan cover and is abutted against the other one of the end surface and the matching surface of the fan cover so that the fixed fan blade supports the fan cover; a groove provided on the other of the end surface and the mating surface of the hood, the groove being configured to accommodate the protrusion; the rotor assembly is connected with the static fan blade, and the protrusion is abutted to the other one of the end face and the matching face of the fan cover so as to enable the fan blade to form a gap with the wall of the accommodating cavity. The utility model provides a wind channel subassembly can make rotor subassembly and the chamber wall between the chamber that holds the chamber of fan housing controllable, and the uniformity of each position in clearance is high.

Description

Air duct assembly, electric fan and dust collector

Technical Field

The utility model relates to a dust collecting equipment technical field particularly, relates to an air duct component, an electric fan and a dust catcher.

Background

The dust collector drives the blades to rotate at a high speed by using the motor, air negative pressure is generated in the sealed shell, and accordingly dust is sucked into a cleaning electric appliance in a dust collecting bag. Air duct assembly among the correlation technique, the very big influence air duct system leakage loss in sound clearance, in order to reduce air duct system seal leakage loss, sound clearance must design very little, but sound clearance receives to be made up of spare part precision influence, and further improves spare part precision and again brings the problem that the showing in cost promotes and the yields reduces, is unfavorable for the popularization of product.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model discloses the first aspect provides an air duct assembly.

The utility model discloses the second aspect provides an electric fan.

The third aspect of the present invention provides a vacuum cleaner.

In view of this, according to the first aspect of the utility model, the utility model provides an air duct assembly, include: the fan cover is provided with an accommodating cavity; the rotor assembly is arranged in the accommodating cavity and comprises a movable fan blade and a bearing; the static fan blade is in contact with the fan cover in the axial direction, and a matching surface is arranged on the static fan blade; the bulge is arranged on one of the end surface and the matching surface of the fan cover and is abutted against the other one of the end surface and the matching surface of the fan cover so that the fixed fan blade supports the fan cover; a groove provided on the other of the end surface and the mating surface of the hood, the groove being configured to accommodate the protrusion; the rotor assembly is connected with the static fan blade, and the protrusion is abutted to the other one of the end face and the matching face of the fan cover so as to enable the fan blade to form a gap with the wall of the accommodating cavity.

The utility model provides an air duct component includes the fan housing, the rotor subassembly, quiet fan blade, arch and recess, the rotor subassembly includes moves fan blade and bearing, the rotor subassembly sets up in the chamber that holds of fan housing and can rotate in holding the chamber, quiet fan blade contacts with the fan housing in the axial direction, make quiet fan blade can support the fan housing, specifically speaking, be equipped with the fitting surface on the quiet fan blade, set up the arch on one of terminal surface and the fitting surface of fan housing, the arch is inconsistent with another looks in terminal surface and the fitting surface of fan housing, make quiet fan blade can support the fan housing; the rotor assembly is connected with the static fan blade, the protrusion is abutted to the other one of the end face and the matching face of the fan cover so as to enable a gap to be formed between the movable fan blade and the cavity wall of the accommodating cavity, the static fan blade is assembled with the fan cover after the rotor assembly is connected with the static fan blade, the protrusion is arranged on one of the end face and the matching face of the fan cover, the gap between the rotor assembly and the cavity wall of the accommodating cavity of the fan cover can be controlled, the consistency of all positions of the gap is high, the gap between the rotor assembly and the cavity wall of the accommodating cavity of the fan cover can be reduced by adjusting the height of the protrusion, and the dynamic and static gaps of the air channel assembly can be reduced. The utility model provides a wind channel subassembly still has the advantage that technology assembly is simple, the low in production cost of whole spare part.

It should be noted that, the utility model provides an air duct assembly sets up the arch on one in the terminal surface of fan housing and fitting surface, be equipped with the recess on the terminal surface of fan housing and the fitting surface of quiet fan blade in another, the recess can hold the arch, in the actual assembly process of product, the first step, install rotor subassembly, fan housing and quiet fan blade and place, and make rotor subassembly and the chamber wall of the installation cavity of fan housing contact, that is, make the movable fan blade contact with the chamber wall of installation cavity, and, the arch is located the recess under this kind of state, it can be understood that, the chamber wall of installation cavity is the curved surface with movable fan blade looks adaptation; then, be connected rotor subassembly and quiet fan blade, specifically, can bond rotor subassembly and quiet fan blade through bonding medium to realize the fixed connection between rotor subassembly and the quiet fan blade. And secondly, lifting the fan cover to enable the protrusions to be separated from the grooves, rotating the fan cover to enable the protrusions to be abutted against the matching surface of the static fan blade, and then connecting the fan cover and the static fan blade. The utility model provides an air duct component, through set up the arch on one in the terminal surface of fan housing and fitting surface, set up the recess on the other in the fitting surface of terminal surface of fan housing and quiet fan leaf, and adopt above-mentioned assembly method to assemble rotor subassembly, fan housing and quiet fan leaf together, because the movable fan leaf contacts with the chamber wall of holding the chamber during first step, namely there is not clearance between the chamber wall of movable fan leaf and holding the chamber at this moment, connect rotor subassembly and quiet fan leaf together and realize first step fixed under this kind of state, and lift up the fan housing through the second step and directly change the clearance between the chamber wall of holding the chamber of fan housing and the movable fan leaf of rotor subassembly, namely, can directly adjust the clearance between the movable fan leaf and the chamber wall of holding the chamber through the distance of controlling lift up the fan housing, because the bellied height is the distance of lifting up the fan housing, also can control the clearance between the chamber wall of holding the chamber and the movable fan leaf of rotor subassembly through designing, make rotor subassembly and fan housing hold the clearance between the chamber wall in chamber controllable, and the uniformity in each position in clearance is high, thereby reduced because assembly error between a plurality of spare parts, the machining precision deviation of a plurality of spare parts results in holding the problem that the chamber wall in chamber and the clearance between the movable air vane are difficult to the management and control after the accumulation, need not to control the size precision of each spare part, thereby reduced the processing degree of difficulty of each spare part, reduced the manufacturing cost of product.

Additionally, the utility model provides an air duct assembly among the above-mentioned technical scheme can also have following additional technical characteristics:

in the above technical solution, further, the number of the protrusions is plural, and the plural protrusions are distributed at intervals along the circumferential direction of the wind cover or the circumferential direction of the stationary blades; the quantity of recess is a plurality of, and a plurality of recesses and a plurality of protruding one-to-one distribution.

In this technical scheme, be equipped with a plurality of archs on one in the terminal surface of fan housing and the fitting surface of quiet fan blade, the circumference of fan housing or the circumference distribution of quiet fan blade are followed to a plurality of archs, and a plurality of mutual interval distribution of archs, be equipped with a plurality of recesses on another in the terminal surface of fan housing and the fitting surface of quiet fan blade, a plurality of recesses and a plurality of protruding one-to-one distribute, make every arch can be located a recess correspondingly, can make the stable support of fan housing on quiet fan blade through setting up a plurality of archs, prevent that the fan housing from rocking. Specifically, the number of the protrusions can be three to five, and within the range, the number of the protrusions is reasonable, so that the process is prevented from being complicated due to excessive protrusions on the premise that the stable support of the fan cover can be ensured; on the one hand, the problem that the number of the bulges is too large and is more than five, so that the structure of the product is complex, and the production difficulty of the product is increased can be avoided, and on the other hand, the problem that the number of the bulges is too small and is less than three, so that the matching of the fan cover and the static fan blade is unstable can be avoided.

In any of the above technical solutions, further, the air duct assembly further includes: the bearing chamber is arranged on the static fan blade, and the bearing is arranged in the bearing chamber and is in clearance fit with the inner wall of the bearing chamber; the first ribs are arranged on the inner wall of the bearing chamber.

In this technical scheme, be equipped with the bearing room on the quiet fan blade, the bearing setting in the bearing room and with the inner wall clearance fit of bearing room, can make the rotation of moving the fan blade more stable through the bearing, the friction is little, the bearing is convenient for the equipment of bearing with bearing room clearance fit, also can prevent that the bearing from receiving extrusion deformation and influencing the life of bearing, furthermore, be equipped with first rib on the inner wall of bearing room, first rib can reduce the clearance between the inner wall of bearing and bearing room, make the bearing form slight interference state with first rib, be convenient for fix the bearing in the bearing room tentatively, promote the axiality of bearing and bearing room, make the rotation of moving the fan blade more smooth and easy, steady.

In any one of the above technical solutions, further, the number of the first ribs is plural, the plural first ribs are distributed at intervals along the circumferential direction of the bearing chamber, and the first ribs are connected with the inner wall of the bearing chamber in an adhering manner.

In the technical scheme, the inner wall of the bearing chamber is provided with the plurality of first ribs which are distributed along the circumferential direction of the bearing chamber and are distributed at intervals, specifically, the number of the first ribs can be three to five, and within the range, the number of the first ribs is reasonable, so that the processing process is prevented from being complicated due to the excessive number of the first ribs on the premise that the bearing is stably matched with the bearing chamber; furthermore, the first ribs are connected with the inner wall of the bearing chamber in an adhering mode through an adhering medium such as glue.

Of course, it is understood that the present disclosure is not limited thereto, and those skilled in the art may design the first ribs and the bearing chamber as an integral structure according to the actual production design layout, or connect the first ribs and the bearing chamber by other methods, and specific conditions in this respect are not listed here, but all of them belong to the protection scope of the present disclosure without departing from the design concept.

In any of the above technical solutions, further, the fan housing further includes a collar, and the collar is sleeved on the stationary fan blade; the static fan blade further comprises a limiting part, the outer wall of the limiting part is round, the lantern ring is sleeved on the limiting part, and the limiting part is in clearance fit with the lantern ring.

In this technical scheme, the fan housing includes the lantern ring, and the fan housing overlaps through the lantern ring cover and is established on quiet fan blade, and quiet fan blade includes spacing portion, and the outer wall of spacing portion is constructed for the circle, specifically, the lantern ring cover is established on spacing portion, spacing portion and lantern ring clearance fit, and spacing portion and lantern ring clearance fit are convenient for the equipment of fan housing, also are convenient for adjust the position of fan housing in the assembling process.

In any of the above technical solutions, further, the air duct assembly further includes: the second rib sets up on the inner wall of the lantern ring, and the quantity of second rib is a plurality of, and a plurality of second ribs are along the circumference interval distribution of the lantern ring, second rib and the inner wall adhesive connection of the lantern ring.

In this technical scheme, be equipped with a plurality of second ribs on the inner wall of the lantern ring, the second rib can reduce the clearance between the inner wall of spacing portion and the lantern ring for spacing portion and second rib form slight interference state, are convenient for fix the quiet wind leaf in the fan housing tentatively, promote the equipment axiality of fan housing and quiet wind leaf. Specifically, a plurality of second ribs are arranged on the inner wall of the sleeve ring, the second ribs are distributed along the circumferential direction of the sleeve ring, and the second ribs are distributed at intervals, specifically, the number of the second ribs can be set to be three to five, within the range, the number of the second ribs is reasonable, and on the premise that the stable matching of the fan cover and the static wind blade can be ensured, the situation that the processing technology is complex due to the fact that the number of the second ribs is too large can be prevented; furthermore, the second ribs are connected with the inner wall of the lantern ring in an adhesive mode and can be connected with the inner wall of the lantern ring in an adhesive mode through adhesive media such as glue.

Of course, it is understood that the present disclosure is not limited thereto, and those skilled in the art may design the second ribs and the collar to be an integral structure formed integrally according to actual production design layout, or connect them by other methods, and the specific situations in this respect are not listed here, but all belong to the protection scope of the present disclosure without departing from the design concept.

In any of the above technical solutions, further, the air duct assembly further includes: a first identification part arranged corresponding to one of the protrusion and the groove; the second identification part is arranged corresponding to the other one of the protrusion and the groove, and the first identification part is matched with the second identification part to identify the position of the rotor assembly relative to the fan cover.

In the technical scheme, the air duct assembly further comprises a first identification part and a second identification part, the first identification part is arranged corresponding to one of the protrusion and the groove, the second identification part is arranged corresponding to the other one of the protrusion and the groove, and the first identification part and the second identification part are matched so as to identify the position of the rotor assembly relative to the fan housing and identify the position of the rotor assembly relative to the fan housing in the assembly process of products, so that an operator can conveniently identify the position of the rotor assembly relative to the fan housing, and assembly errors are further eliminated; whether the product is assembled in place or not can be judged by detecting the position relation of the first identification part and the second identification part, so that the quality of the product is improved.

Specifically, in the actual assembling process of product, in the first step, promptly, move the fan blade and contact with the chamber wall of installation cavity to, when the arch on the fan housing was located the recess that sets up on quiet fan blade, second sign portion aligns with first sign portion, and in the second step, promptly, when the protruding butt was on the fitting surface of quiet fan blade, second sign portion staggers with first sign portion, promptly, first sign portion is in adjacent but stagger state and protruding and recess and is in contactless state with the second sign portion.

In any of the above technical solutions, further, the rotor assembly is adhesively connected to the stator blades.

In the technical scheme, the rotor assembly is connected with the static wind blade in a bonding mode through bonding media such as glue. Specifically, an adhesive medium such as glue can be applied between the bearing of the rotor assembly and the bearing chamber of the stationary blade, so that the bearing is fixed in the bearing chamber, and the rotor assembly is connected with the stationary blade in an adhesive manner.

In any of the above technical solutions, further, the wind shield is connected with the static blades in an adhesive manner.

In the technical scheme, the fan cover is connected with the static fan blade in an adhering mode through an adhering medium such as glue. Specifically, a bonding medium such as glue can be applied between the collar of the fan housing and the limiting portion of the stationary blade, so that the limiting portion is fixed in the collar, and the fan housing is bonded with the stationary blade.

In any of the above technical solutions, further, the height value of the protrusion is a cosine of a gap value of a normal gap between the moving blade and the cavity wall of the accommodating cavity.

In this technical scheme, the raised height value is a cosine of a clearance value of a normal clearance between the movable blade and a cavity wall of the accommodating cavity, specifically, the raised height value is an axial clearance between the movable blade and the cavity wall of the accommodating cavity, the axial clearance value is a, the clearance value of the normal clearance between the movable blade and the cavity wall of the accommodating cavity is B, and an included angle between the axial clearance and the normal clearance is θ, then

That is, the height value of the protrusion is set according to the clearance value of the normal clearance between the movable fan blade and the cavity wall of the accommodating cavity, and specifically, the height value of the protrusion is the cosine value of the clearance value of the normal clearance between the movable fan blade and the cavity wall of the accommodating cavity.

Of course, it is understood that the present disclosure is not limited thereto, and those skilled in the art can design the height of the protrusion according to the actual performance of the air duct assembly according to the layout required by the actual requirement, and the specific situation in this respect is not listed here, but the present disclosure is within the protection scope of the present disclosure without departing from the design concept.

In any of the above technical solutions, further, a value range of a normal gap between the movable blade and a cavity wall of the accommodating cavity is 0.2mm to 0.3 mm.

In this technical scheme, the value range that sets up the normal direction clearance between the fan blade and the chamber wall that holds the chamber is 0.2mm to 0.3mm, in this scope, make the normal direction clearance between the fan blade and the chamber wall that holds the chamber reasonable, reduce sound seal clearance as far as possible, reduce fluid leakage, and then under the prerequisite of promotion electric fan system efficiency, can also prevent that the normal direction clearance undersize between the fan blade and the chamber wall that holds the chamber leads to the machining precision demand too high, be favorable to reducing manufacturing cost when guaranteeing electric fan's performance.

In any of the above technical solutions, further, the rotor assembly further includes: the rotating shaft is connected with the movable fan blade and penetrates through the bearing; the magnetic part is sleeved on the rotating shaft.

In this technical scheme, the rotor subassembly still includes pivot and magnetic part, and the pivot is connected with the fan blade that moves, and the pivot is worn to establish in the bearing and is makeed the fan blade that moves and can play lubricated, reduce frictional effect rotating the in-process bearing, and the magnetic part cover is established in the pivot, and the magnetic part can be magnet.

In any of the above technical solutions, further, the moving blade is provided with a mounting hole, the rotating shaft penetrates through the mounting hole, and the mounting hole is in interference fit with the rotating shaft; the magnetic part is in clearance fit with the rotating shaft and is connected with the rotating shaft in a bonding way.

In the technical scheme, the movable fan blade is connected with the rotating shaft through the mounting hole, the mounting hole is in interference fit with the rotating shaft, and the interference fit ensures that the coaxiality of the assembled movable fan blade and the rotating shaft is high and the assembly deviation is small, so that the balance of the movable fan blade in the rotating process is good; furthermore, the mass center of the movable fan blade is located on the axis of the rotating shaft, so that the rotating stability of the movable fan blade is further improved. The magnetic part is in clearance fit with the rotating shaft, is connected with the rotating shaft in a bonding mode, and specifically can be connected with the rotating shaft in a bonding mode through bonding media such as glue.

In any of the above technical solutions, further, the bearing includes: the inner raceway is arranged on the side wall of the rotating shaft; the outer ring is sleeved on the outer side of the rotating shaft, an outer raceway is arranged on the outer ring, and an accommodating space is formed between the outer ring and the rotating shaft; and a roller disposed in the accommodating space, the roller being supported between the inner raceway and the outer raceway.

In the technical scheme, the bearing comprises an inner raceway, an outer ring, an outer raceway and a roller, wherein the inner raceway is arranged on the side wall of the rotating shaft, namely, the side wall of the rotating shaft forms the inner ring of the bearing, and the inner ring of the bearing is not required to be arranged independently, so that the structure of the bearing is simplified, and the production cost of the bearing is reduced; specifically, an outer raceway is provided on the outer ring, an accommodation space is formed between the outer ring and the rotating shaft, a roller is disposed in the accommodation space, and the roller is supported between the inner raceway and the outer raceway.

The utility model discloses the second aspect provides an electric fan, the wind channel subassembly in any above-mentioned technical scheme, consequently the utility model provides an electric fan has all beneficial effects of the wind channel subassembly that provides among any above-mentioned technical scheme.

Further, electric fan still includes the motor, and the motor drives the rotor subassembly and rotates.

The utility model discloses the third aspect provides a dust catcher, the electric fan in the wind channel subassembly or the above-mentioned second aspect in the arbitrary technical scheme of above-mentioned first aspect, consequently the utility model provides a dust catcher has the whole beneficial effects of the wind channel subassembly that provides or the electric fan that the above-mentioned second aspect provided in the arbitrary technical scheme of above-mentioned first aspect.

Furthermore, the electric fan also comprises a motor, the motor drives the rotor component to rotate, and air negative pressure is generated in the sealed shell, so that dust is sucked into a dust collecting bag of the dust collector.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, 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:

figure 1 illustrates an exploded view of a duct assembly according to one embodiment of the present invention;

FIG. 2 shows an enlarged partial view of the air duct assembly of FIG. 1 at A;

FIG. 3 shows an enlarged partial view of the air duct assembly of FIG. 1 at B;

FIG. 4 illustrates an assembled structural schematic view of an air duct assembly according to an embodiment of the present invention;

FIG. 5 shows an enlarged partial view of the air duct assembly of FIG. 4 at C;

FIG. 6 is a schematic cross-sectional view of the air duct assembly of the embodiment of FIG. 4;

FIG. 7 is a schematic structural view of an assembled state of an air duct assembly during assembly according to an embodiment of the present invention;

FIG. 8 shows an enlarged partial view of the air duct assembly of FIG. 7 at D;

FIG. 9 illustrates a cross-sectional structural view of the air duct assembly of the embodiment of FIG. 7.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 9 is:

100 air duct assembly, 110 fan housing, 111 end face, 112 protrusion, 114 collar, 116 second rib, 120 rotor assembly, 122 moving blade, 124 bearing, 126 rotating shaft, 128 magnetic element, 130 static blade, 132 matching surface, 134 groove, 136 bearing chamber, 138 first rib, 139 limit part, 140 first mark part and 142 second mark part.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An air duct assembly 100, an electric fan, and a vacuum cleaner according to some embodiments of the present invention will be described with reference to fig. 1 to 9.

Example one

As shown in fig. 1 to 6, according to a first aspect of the present invention, the present invention provides an air duct assembly 100, comprising: the fan housing 110, the rotor assembly 120, the static blades 130, the protrusions 112 and the grooves 134, wherein the rotor assembly 120 comprises the dynamic blades 122 and the bearings 124.

Specifically, as shown in fig. 1, fig. 2 and fig. 3, a receiving cavity is formed on the wind shield 110, the rotor assembly 120 is disposed in the receiving cavity, the static wind vane 130 is in contact with the wind shield 110 in the axial direction, and a matching surface 132 is formed on the static wind vane 130; a protrusion 112 is provided on one of the end surface 111 and the mating surface 132 of the fan housing 110, and the protrusion 112 abuts against the other of the end surface 111 and the mating surface 132 of the fan housing 110, so that the stationary blades 130 support the fan housing 110; a groove 134 is provided on the other of the end surface 111 and the mating surface 132 of the hood 110, the groove 134 being configured to receive the protrusion 112; the rotor assembly 120 is connected to the stationary blade 130, and the protrusion 112 abuts against the other of the end surface 111 and the matching surface 132 of the fan housing 110, so as to form a gap between the movable blade 122 and the cavity wall of the accommodating cavity.

The utility model provides an air duct assembly 100 includes fan housing 110, rotor subassembly 120, quiet fan blade 130, arch 112 and recess 134, rotor subassembly 120 includes fan blade 122 and bearing 124, rotor subassembly 120 sets up in the holding chamber of fan housing 110 and can rotate in holding the chamber, quiet fan blade 130 contacts with fan housing 110 in the axial direction, make quiet fan blade 130 can support fan housing 110, specifically, be equipped with fitting surface 132 on quiet fan blade 130, be equipped with arch 112 on one of terminal surface 111 and fitting surface 132 of fan housing 110, arch 112 and the terminal surface 111 of fan housing 110 and another looks butt in fitting surface 132 so that quiet fan blade 130 supports fan housing 110, wherein, rotor subassembly 120 is connected with quiet fan blade 130, arch 112 and the terminal surface 111 of fan housing 110 and another looks butt in fitting surface 132, so that form the clearance between quiet fan blade 122 and the chamber wall of holding the chamber, assemble together quiet fan blade 130 and fan housing 110 after connecting rotor subassembly 120 with quiet fan blade 130, and one of the end surface 111 and the fitting surface 132 of the wind shield 110 is provided with the protrusion 112, so that the gap between the rotor assembly 120 and the cavity wall of the accommodating cavity of the wind shield 110 can be controlled, the consistency of each position of the gap is high, and the height of the protrusion 112 can be adjusted to play a role in reducing the gap between the rotor assembly 120 and the cavity wall of the accommodating cavity of the wind shield 110, that is, the dynamic and static gaps of the air duct assembly 100 can be reduced, so that the fluid eddy loss caused by leakage is synchronously reduced, and the aerodynamic noise of the electric fan can be reduced. The utility model provides an air duct assembly 100 still has the advantage that technology assembly is simple, the low in production cost of whole spare part.

As shown in fig. 1-9, it should be noted that the present invention provides an air duct assembly 100, a projection 112 is provided on one of the end surface 111 and the mating surface 132 of the hood 110, a groove 134 is provided on the other of the end surface 111 and the mating surface 132 of the hood 110, the groove 134 being capable of receiving the protrusion 112, in the actual assembly process of the product, in the first step, the rotor assembly 120, the fan housing 110 and the stationary blade 130 are installed and placed, and the rotor assembly 120 is in contact with the wall of the installation cavity of the fan housing 110, fig. 9 shows a schematic view of the internal state of the air duct assembly 100 when the moving blades 122 are in contact with the wall of the installation cavity in the first step of the actual assembly process of the product, at this time, the moving blades 122 are in contact with the wall of the installation cavity, in addition, in this state, the protrusion 112 is located in the groove 134, and it can be understood that the cavity wall of the installation cavity is a curved surface adapted to the moving blade 122; then, the rotor assembly 120 is connected to the stator blade 130, and specifically, the rotor assembly 120 and the stator blade 130 may be bonded by an adhesive medium, so that the rotor assembly 120 and the stator blade 130 are fixedly connected. Secondly, the fan housing 110 is lifted up to separate the protrusion 112 from the groove 134, the fan housing 110 is rotated to abut against the matching surface 132 of the stationary blade 130, and then the fan housing 110 is connected with the stationary blade 130, specifically, the fan housing 110 and the stationary blade 130 can be bonded by an adhesive medium, so as to achieve the fixed connection between the fan housing 110 and the stationary blade 130, fig. 6 shows an internal state diagram of the air duct assembly 100 when the protrusion 112 abuts against the matching surface 132 of the stationary blade 130 in the second step of the actual assembly process of the product, and at this time, a gap is formed between the moving blade 122 and the wall of the installation cavity. The utility model provides an air duct assembly 100, through set up arch 112 on one in terminal surface 111 and the fitting surface 132 of fan housing 110, set up recess 134 on the other in terminal surface 111 and the fitting surface 132 of fan housing 110, and adopt above-mentioned assembly method to assemble rotor subassembly 120, fan housing 110 and quiet fan blade 130 together, because the movable fan blade 122 contacts with the chamber wall of holding the chamber in the first step, namely there is not the clearance between movable fan blade 122 and the chamber wall of holding the chamber at this moment, link together rotor subassembly 120 and quiet fan blade 130 to realize first step fixedly under this kind of state, and lift up fan housing 110 through the second step and directly change the clearance between the chamber wall of holding the chamber of fan housing 110 and movable fan blade 122 of rotor subassembly 120, namely, can directly adjust the clearance between movable fan blade 122 and the chamber wall of holding the chamber through the distance that control lifted up fan housing 110, because the height of arch 112 is the distance of lifting up fan housing 110, that is, the height of the design protrusion 112 can control the gap between the cavity wall of the accommodating cavity and the movable fan blade 122 of the rotor assembly 120, so that the gap between the cavity wall of the accommodating cavity of the rotor assembly 120 and the fan housing 110 is controllable, and the consistency of each position of the gap is high, thereby reducing the problem that the gap between the cavity wall of the accommodating cavity and the movable fan blade 122 is difficult to control due to assembly errors between a plurality of parts and accumulated machining precision deviation of the plurality of parts, and the dimensional precision of each part does not need to be controlled, thereby reducing the machining difficulty of each part, and reducing the production cost of products.

Example two

On the basis of the first embodiment, as shown in fig. 1, 4 and 7, the number of the protrusions 112 is multiple, and the multiple protrusions 112 are distributed at intervals along the circumferential direction of the wind shield 110 or the circumferential direction of the static blades 130; the number of the grooves 134 is plural, and the plural grooves 134 are distributed in one-to-one correspondence with the plural protrusions 112.

In this embodiment, a plurality of protrusions 112 are disposed on one of the end surface 111 of the wind shield 110 and the mating surface 132 of the stationary blades 130, the plurality of protrusions 112 are distributed along the circumferential direction of the wind shield 110 or the circumferential direction of the stationary blades 130, the plurality of protrusions 112 are distributed at intervals, a plurality of grooves 134 are disposed on the other one of the end surface 111 of the wind shield 110 and the mating surface 132 of the stationary blades 130, the plurality of grooves 134 and the plurality of protrusions 112 are distributed in a one-to-one correspondence manner, so that each protrusion 112 can be correspondingly disposed in one groove 134, the wind shield 110 can be stably supported on the stationary blades 130 by disposing the plurality of protrusions 112, and the wind shield 110 is prevented from shaking. Specifically, the number of the protrusions 112 may be three to five, and within this range, the number of the protrusions 112 is reasonable, and on the premise that the stable support of the wind shield 110 can be ensured, the process complexity caused by too many protrusions 112 can be prevented; on one hand, the problem that the number of the protrusions 112 is too large and more than five causes the structure of the product to be complex and increases the production difficulty of the product can be avoided, and on the other hand, the problem that the number of the protrusions 112 is too small and less than three causes the unstable matching of the fan cover 110 and the static wind blade 130 can be avoided.

Further, as shown in fig. 1, the stationary blade 130 is provided with a bearing chamber 136, the bearing 124 is disposed in the bearing chamber 136 and is in clearance fit with an inner wall of the bearing chamber 136, the rotation of the movable blade 122 can be more stable and the friction is small through the bearing 124, the assembly of the bearing 124 is facilitated through the clearance fit between the bearing 124 and the bearing chamber 136, and the service life of the bearing 124 can also be prevented from being affected by the extrusion deformation of the bearing 124, further, the inner wall of the bearing chamber 136 is provided with a first rib 138, the first rib 138 can reduce the clearance between the bearing 124 and the inner wall of the bearing chamber 136, so that the bearing 124 and the first rib 138 form a slight interference state, the bearing 124 is conveniently and preliminarily fixed in the bearing chamber 136, the coaxiality between the bearing 124 and the bearing chamber 136 is improved, and the rotation of the movable blade 122 is smoother and more stable.

Further, as shown in fig. 1, a plurality of first ribs 138 are provided on an inner wall of the bearing chamber 136, the plurality of first ribs 138 are distributed along a circumferential direction of the bearing chamber 136, and the plurality of first ribs 138 are distributed at intervals, specifically, the number of the first ribs 138 may be three to five, within this range, the number of the first ribs 138 is reasonable, and on the premise that the bearing 124 and the bearing chamber 136 can be stably matched, the processing process is prevented from being complicated due to an excessive number of the first ribs 138; further, the first ribs 138 are bonded to the inner wall of the bearing chamber 136, and may be bonded by a bonding medium such as glue.

Of course, it is understood that the present invention is not limited thereto, and those skilled in the art can design the first ribs 138 and the bearing chamber 136 as an integral structure according to the actual production design layout, or connect them by other means, and the specific cases are not listed here, but all fall within the protection scope of the present invention without departing from the design concept.

Further, as shown in fig. 1, 6 and 9, the wind shield 110 includes a collar 114, the wind shield 110 is sleeved on the stationary blade 130 through the collar 114, the stationary blade 130 includes a limiting portion 139, an outer wall of the limiting portion 139 is configured in a circular shape, specifically, the collar 114 is sleeved on the limiting portion 139, the limiting portion 139 is in clearance fit with the collar 114 to facilitate assembly of the wind shield 110, and also facilitate adjustment of the position of the wind shield 110 in the assembly process.

Further, as shown in fig. 1, a plurality of second ribs 116 are disposed on the inner wall of the collar 114, and the second ribs 116 can reduce a gap between the limiting portion 139 and the inner wall of the collar 114, so that the limiting portion 139 and the second ribs 116 form a slight interference state, which facilitates initially fixing the stationary blade 130 in the fan housing 110, and improves the assembly coaxiality of the fan housing 110 and the stationary blade 130. Specifically, a plurality of second ribs 116 are arranged on the inner wall of the sleeve ring 114, the plurality of second ribs 116 are distributed along the circumferential direction of the sleeve ring 114, and the plurality of second ribs 116 are distributed at intervals, specifically, the number of the second ribs 116 can be set to be three to five, within this range, the number of the second ribs 116 is reasonable, and on the premise that the stable matching between the fan cover 110 and the stationary fan blade 130 can be ensured, the processing process is prevented from being complicated due to the excessive number of the second ribs 116; further, the second ribs 116 are bonded to the inner wall of the collar 114, and may be bonded by a bonding medium such as glue.

Of course, it is understood that the present invention is not limited thereto, and those skilled in the art can design the second ribs 116 and the collar 114 as an integral structure according to the actual production design layout, or connect them by other methods, and the specific situations in this respect are not listed here, but all fall within the protection scope of the present invention without departing from the design concept.

EXAMPLE III

On the basis of any of the above embodiments, as shown in fig. 2, fig. 3, fig. 4, fig. 5, fig. 7 and fig. 8, the air duct assembly 100 further includes: a first identification part 140 provided corresponding to one of the protrusion 112 and the groove 134; and a second identification portion 142 disposed corresponding to the other of the protrusion 112 and the groove 134, wherein the first identification portion 140 and the second identification portion 142 cooperate to identify a position of the rotor assembly 120 relative to the wind shield 110.

In this embodiment, the air duct assembly 100 further includes a first identification portion 140 and a second identification portion 142, the first identification portion 140 is disposed corresponding to one of the protrusion 112 and the groove 134, the second identification portion 142 is disposed corresponding to the other of the protrusion 112 and the groove 134, and the first identification portion 140 and the second identification portion 142 cooperate to identify the position of the rotor assembly 120 relative to the fan housing 110, so as to identify the position of the rotor assembly 120 relative to the fan housing 110 during the assembly process of the product, thereby facilitating the identification of the operator, and further eliminating the assembly error; whether the product is assembled in place can also be judged by detecting the position relation of the first identification part 140 and the second identification part 142, so that the quality of the product is improved.

As shown in fig. 4 to 9, in particular, fig. 7 and 8 show the external state of the air duct assembly 100 when the moving blade 122 contacts with the wall of the installation cavity in the first step in the actual assembly process of the product, in this case, the protrusion 112 on the fan housing 110 is located in the groove 134 provided on the stationary blade 130, and the second identification portion 142 is aligned with the first identification portion 140; fig. 4 and 5 show the schematic external state of the air duct assembly 100 when the protrusion 112 abuts against the mating surface 132 of the stationary blade 130 in the second step of the actual assembly process of the product, at this time, the second identification portion 142 is staggered from the first identification portion 140, that is, the first identification portion 140 and the second identification portion 142 are adjacent but staggered, and the protrusion 112 and the groove 134 are in a non-contact state.

Further, the rotor assembly 120 is bonded to the stator blade 130 through a bonding medium such as glue. Specifically, an adhesive medium such as glue may be applied between the bearing 124 of the rotor assembly 120 and the bearing chamber 136 of the stator vane 130, so that the bearing 124 is fixed in the bearing chamber 136, thereby achieving the adhesive connection between the rotor assembly 120 and the stator vane 130.

Further, the wind cover 110 is bonded to the static wind blade 130, and may be bonded to the static wind blade by a bonding medium such as glue. Specifically, an adhesive medium such as glue may be applied between the collar 114 of the wind shield 110 and the limiting portion 139 of the static wind blade 130, so that the limiting portion 139 is fixed in the collar 114, thereby achieving the bonding connection between the wind shield 110 and the static wind blade 130.

Further, the height value of the protrusion 112 is a cosine value of a gap value of a normal gap between the movable blade 122 and the cavity wall of the accommodating cavity, specifically, the height of the protrusion 112 is an axial gap between the movable blade 122 and the cavity wall of the accommodating cavity, the axial gap value is a, the gap value of the normal gap between the movable blade 122 and the cavity wall of the accommodating cavity is B, and an included angle between the axial gap and the normal gap is θ, then

That is, the height value of the protrusion 112 is set according to the gap value of the normal gap between the movable fan blade 122 and the cavity wall of the accommodating cavity, and specifically, the height value of the protrusion 112 is the cosine value of the gap value of the normal gap between the movable fan blade 122 and the cavity wall of the accommodating cavity.

Of course, it is understood that the present invention is not limited thereto, and those skilled in the art can design the height of the protrusion 112 according to the actual performance of the air duct assembly 100 according to the layout required by the actual requirement, and the specific situation in this respect is not listed here, but all that falls within the protection scope of the present invention without departing from the design concept.

Further, the value range of the normal clearance between the setting movable fan blade 122 and the chamber wall that holds the chamber is 0.2mm to 0.3mm, in this scope, make movable fan blade 122 and the normal clearance that holds between the chamber wall in chamber reasonable, reduce the sound seal clearance as far as possible, reduce fluid leakage, and then under the prerequisite of promotion electric fan system efficiency, can also prevent that the normal clearance undersize between movable fan blade 122 and the chamber wall that holds the chamber leads to the machining precision demand too high, be favorable to reducing manufacturing cost when guaranteeing electric fan's performance. Further, as shown in fig. 1, 6 and 9, the rotor assembly 120 further includes a rotating shaft 126 and a magnetic member 128, the rotating shaft 126 is connected to the moving blade 122, the rotating shaft 126 is disposed in the bearing 124 in a penetrating manner, so that the bearing 124 can perform the functions of lubricating and reducing friction during the rotation of the moving blade 122, the magnetic member 128 is sleeved on the rotating shaft 126, and the magnetic member 128 may be a magnet.

Further, the movable fan blade 122 is connected with the rotating shaft 126 through a mounting hole, the mounting hole is in interference fit with the rotating shaft 126, and the interference fit enables the coaxiality of the assembled movable fan blade 122 and the rotating shaft 126 to be high and the assembly deviation to be small, so that the balance of the movable fan blade 122 in the rotating process is good; further, the mass center of the movable fan blade 122 is located on the axis of the rotating shaft 126, so that the rotation stability of the movable fan blade 122 is further improved. The magnetic member 128 is in clearance fit with the rotating shaft 126, and the magnetic member 128 is adhesively connected to the rotating shaft 126, specifically, by an adhesive medium such as glue.

Further, the bearing 124 comprises an inner raceway, an outer ring, an outer raceway and rollers, wherein the inner raceway is arranged on the side wall of the rotating shaft 126, that is, the side wall of the rotating shaft 126 forms the inner ring of the bearing 124, and the inner ring of the bearing 124 does not need to be arranged separately, so that the structure of the bearing 124 is simplified, and the production cost of the bearing 124 is reduced; specifically, an outer raceway is provided on the outer ring, an accommodation space is formed between the outer ring and the rotating shaft 126, and rollers are provided in the accommodation space, supported between the inner raceway and the outer raceway.

Specifically, the bearing 124 may be a double-row ball type conjoined bearing, and the specific structure of the double-row ball type conjoined bearing is that two bearing inner raceways are arranged on the rotating shaft 126, two bearing outer raceways may be arranged on the outer ring, or may be arranged on a separate outer ring, and the two outer rings are connected by a housing.

Example four

The utility model discloses the second aspect provides an electric fan, air duct assembly 100 in any embodiment of the aforesaid, consequently the utility model provides an electric fan has all beneficial effects of the air duct assembly 100 that provides in any embodiment of the aforesaid.

Further, the electric blower further includes a motor, and the motor drives the rotor assembly 120 to rotate.

EXAMPLE five

The third aspect of the present invention provides a vacuum cleaner, comprising an air duct assembly 100 in any of the above-mentioned embodiments of the first aspect or an electric fan in the above-mentioned second aspect, therefore, the present invention provides a vacuum cleaner having all the advantages of the air duct assembly 100 provided in any of the above-mentioned embodiments of the first aspect or the electric fan provided in the above-mentioned second aspect.

Further, the electric blower further includes a motor, which drives the rotor assembly 120 to rotate, and generates an air negative pressure in the sealed housing, thereby sucking dusts into the dust bag of the cleaner.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

As shown in fig. 1 to 9, the present invention provides a high-precision air channel assembly 100 for an electric blower of a vacuum cleaner, which comprises a fan housing 110, a movable blade 122, a stationary blade 130, a bearing 124, a magnetic member 128 and an adhesive medium. The rotor assembly 120 consists of the movable fan blade 122, the bearing 124 and the magnetic part 128, and the bearing 124 in the rotor assembly 120 is in clearance fit with the bearing chamber 136 of the static fan blade 130 and is fixed by a bonding medium; the wind shield 110 is in clearance fit with the stationary blade 130 by means of an adhesive medium, and in order to improve the coaxiality of the clearance fit, three or more first ribs 138 are designed on the inner circular surface of the bearing 124 of the stationary blade 130, and three or more second ribs 116 are designed on the inner surface of the wind shield 110 matched with the stationary blade 130. A spigot structure is designed at an axial position of the stationary blade 130 matched with the fan housing 110, and is used for limiting the axial assembly size of the fan housing 110, more than three groove 134 structures are designed on a spigot plane of the stationary blade 130, more than three protrusion 112 structures are designed on the spigot plane of the fan housing 110, and the height of the protrusion 112 structures is consistent, wherein the width and the depth of the groove 134 structures are more than or equal to the width and the height of the protrusion 112 structures, the grooves 134 are in one-to-one correspondence with the circumferential distribution of the protrusions 112, that is, the circumferential distribution angle of the grooves 134 is consistent with the circumferential distribution angle of the protrusions 112. The utility model provides a high accuracy wind channel subassembly 100 can effectively reduce the sound seal clearance of moving fan blade 122 and quiet fan blade 130 in wind channel subassembly 100, reduces the fluid and leaks, and then promotes electric fan system efficiency. And simultaneously, the utility model provides an electric fan has the characteristics that pneumatic noise is little.

Further, the rotor assembly 120, the fan housing 110 and the stationary blade 130 are sequentially installed and placed, the gap fit position between the rotor assembly 120 and the stationary blade 130 is coated with an adhesive medium and then adhered and fixed for the first time, at the moment, the outer contour line surface of the moving blade 122 in the rotor assembly 120 is in a contact state with the inner curved surface of the fan housing 110, the protrusion 112 of the fan housing 110 is aligned with the groove 134 of the stationary blade 130, and the two are axially assembled to the spigot position. After the primary bonding and fixing is completed, the fan housing 110 is lifted, so that the structure of the protrusion 112 of the fan housing 110 is separated from the structure of the groove 134, the gap fit position between the fan housing 110 and the static wind blades 130 is coated with bonding medium and then bonded and fixed for the second time, the protrusion 112 and the groove 134 are staggered, and the protrusion 112 of the fan housing 110 is flush with the spigot plane of the static wind blades 130.

Further, a first mark is designed at a position, corresponding to one of the protrusions 112, of the circular surface of the outer side of the fan housing 110, a second mark is designed at a position, corresponding to one of the grooves 134, of the circular surface of the outer side of the stationary blade 130, when the first mark and the second mark are bonded for the first time, the first mark and the second mark are aligned, the protrusion 112 and the groove 134 are also aligned, and when the second mark is bonded for the second time, the first mark and the second mark are adjacent but staggered, and the protrusion 112 and the groove 134 are not in contact, so that an operator can recognize the first mark and further eliminate assembly errors.

Specifically, the height of the protrusion 112 is set according to the cosine value of the size of the dynamic and static normal gaps at the contact position of the movable fan blade 122 and the fan housing 110 during the primary bonding, and the corresponding size of the height of the protrusion 112 and the dynamic and static normal gaps can also be designed according to the actual design.

An object of the utility model is to provide a on the basis that does not improve the spare part precision, and does not improve assembly process precision, but can realize the wind channel subassembly 100 in the sound clearance of super little clearance, super high accuracy, simultaneously, owing to reduced wind channel sound clearance, reduced the fluid eddy current loss that the leakage brought in step to reduce the pneumatic noise of electric fan. According to the utility model provides a high accuracy wind channel subassembly 100, technology assembly is simple, and whole spare part and low in production cost, and wind channel sound clearance size uniformity is high, and electric fan efficiency is undulant little.

Specifically, the protrusions 112 are disposed on the end surface 111 of the fan housing 110, the grooves 134 are disposed on the matching surface 132 of the stationary blade 130, the number of the protrusions 112 is specifically 3, and the number of the grooves 134 is specifically 3.

Specifically, the protrusions 112 are disposed on the end surface 111 of the wind shield 110, the grooves 134 are disposed on the matching surface 132 of the stationary blade 130, the number of the protrusions 112 is greater than 3, and the number of the grooves 134 is greater than 3.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. An air duct assembly, comprising:

the fan cover is provided with an accommodating cavity;

the rotor assembly is arranged in the accommodating cavity and comprises a movable fan blade and a bearing;

the static fan blade is in contact with the fan cover in the axial direction, and a matching surface is arranged on the static fan blade;

the protrusion is arranged on one of the end surface of the fan cover and the matching surface, and the protrusion is abutted against the other of the end surface of the fan cover and the matching surface so that the static fan blade supports the fan cover;

a groove provided on the other of the end surface of the hood and the mating surface, the groove being configured to accommodate the protrusion;

the rotor assembly is connected with the static fan blade, and the protrusion is abutted against the other one of the end face of the fan cover and the matching surface, so that a gap is formed between the movable fan blade and the cavity wall of the accommodating cavity.

2. The air duct assembly of claim 1,

the number of the bulges is multiple, and the bulges are distributed at intervals along the circumferential direction of the fan cover or the circumferential direction of the static fan blade;

the number of the grooves is multiple, and the grooves and the protrusions are distributed in a one-to-one corresponding mode.

3. The air duct assembly of claim 1, further comprising:

the bearing chamber is arranged on the static fan blade, and the bearing is arranged in the bearing chamber and is in clearance fit with the inner wall of the bearing chamber;

the first ribs are arranged on the inner wall of the bearing chamber.

4. The air duct assembly of claim 3,

the number of first rib is a plurality of, and is a plurality of first rib is followed the circumference interval distribution of bearing room, first rib with the inner wall adhesive joint of bearing room.

5. The air duct assembly of claim 1,

the fan cover further comprises a lantern ring, and the lantern ring is sleeved on the static fan blade;

the static fan blade further comprises a limiting portion, the outer wall of the limiting portion is constructed to be circular, the sleeve ring is sleeved on the limiting portion, and the limiting portion is in clearance fit with the sleeve ring.

6. The air duct assembly of claim 5, further comprising:

the second rib sets up on the inner wall of the lantern ring, the quantity of second rib is a plurality ofly, and is a plurality of the second rib is followed the circumference interval distribution of the lantern ring, the second rib with the inner wall adhesive connection of the lantern ring.

7. The air duct assembly according to any one of claims 1-5, further comprising:

a first identification portion provided corresponding to one of the protrusion and the groove;

and the second identification part is correspondingly arranged with the other one of the protrusion and the groove, and the first identification part is matched with the second identification part to identify the position of the rotor assembly relative to the wind cover.

8. The air duct assembly according to any one of claims 1-5,

the rotor assembly is connected with the static fan blade in an adhering mode; and/or

The fan cover is connected with the static fan blade in an adhesive mode.

9. The air duct assembly according to any one of claims 1-5,

the height value of the protrusion is the cosine of the clearance value of the normal clearance between the movable fan blade and the cavity wall of the accommodating cavity.

10. The air duct assembly of claim 9,

the value range of the normal clearance between the movable fan blade and the cavity wall of the accommodating cavity is 0.2mm to 0.3 mm.

11. The air duct assembly according to any one of claims 1-5, wherein the rotor assembly further comprises:

the rotating shaft is connected with the movable fan blade and penetrates through the bearing;

and the magnetic part is sleeved on the rotating shaft.

12. The air duct assembly of claim 11,

the movable fan blade is provided with a mounting hole, the rotating shaft penetrates through the mounting hole, and the mounting hole is in interference fit with the rotating shaft;

the magnetic part is in clearance fit with the rotating shaft, and the magnetic part is connected with the rotating shaft in a bonding mode.

13. The air duct assembly of claim 11, wherein the bearing comprises:

the inner raceway is arranged on the side wall of the rotating shaft;

the outer ring is sleeved on the outer side of the rotating shaft, an outer raceway is arranged on the outer ring, and an accommodating space is formed between the outer ring and the rotating shaft;

a roller disposed in the receiving space, the roller supported between the inner raceway and the outer raceway.

14. An electric fan, comprising:

the air duct assembly of any one of claims 1-13.

15. A vacuum cleaner, comprising:

the air duct assembly of any one of claims 1-13; or

The electric blower of claim 14.

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