CN113700660A - Air duct system component and fixed impeller thereof - Google Patents

Abstract

The invention relates to an air duct system component and a fixed impeller thereof. The air duct system component includes a wind cover, an impeller and a fixed impeller; the wind cover includes a rear end and a front end provided with a first circular frustum-shaped cavity; the impeller includes a wheel disc, The bottom of the wheel disc and a plurality of first blades, each first blade is evenly arranged on the outer surface of the wheel disc; the fixed impeller includes an outer cylindrical part, an inner cylindrical part and a central cylindrical part; the inner cylindrical part is fixed on the outer surface by a plurality of second blades on the inner wall of the cylindrical part; the central cylindrical part is fixed on the inner wall of the inner cylindrical part by at least two fourth ribs; the front end of the impeller is fixed on the rotating shaft of the brushless motor, and the front end is located in the first circular truncated cavity of the wind cover, and the wheel of the impeller is The bottom of the disc is close to the bottom of the first circular truncated cavity of the hood, the outer end surface of each first blade of the impeller and the inner surface of the first circular truncated cavity of the hood form an air duct gap; the outer cylindrical part of the fixed impeller is fixed at the front end of the hood Ministry. The air duct system component of the invention has the advantages of reasonable structure, small volume and light weight.

Description

Air duct system component and fixed impeller thereof

[ technical field ] A method for producing a semiconductor device

The present invention relates to miniature or miniature motors, and in particular to miniature or miniature brushless motors, such as those used in vacuum cleaners, and more particularly to air duct system components used in brushless motors.

[ background of the invention ]

The prior art is a brushless motor, such as a brushless motor used in a vacuum cleaner, some brushless motors are directly called as vacuum cleaner motors, and have the following disadvantages:

firstly, due to the structural limitation of the air duct system of the motor of the dust collector in the prior art, the air inlet mode of the dust collector in the prior art is that dust is completely isolated at the outer end of the air inlet of the motor, and the air inlet needs to use a very dense filter screen and a filter element to isolate the dust, so that the air flow is blocked and increased, and the suction force of the motor is reduced;

secondly, a motor of the dust collector in the prior art adopts a centrifugal impeller, the centrifugal impeller is large in size, each first blade on the impeller is in a riveted structure, so that the whole impeller is not firm enough and is limited by the conditions such as the centrifugal impeller structure and the like, the highest rotating speed of the motor can only be 60000-80000 rpm (revolutions per minute) at most, the working efficient point range is narrow, the working performance is greatly limited, and the defects of small suction force, large size, heavy weight, large noise, low efficiency and the like generally exist;

third, the fit clearance is great between impeller and other parts of prior art dust catcher motor, and the clearance atmospheric current collides each other, will produce the noise, and airflow loss is just so big for whole motor can't reach better efficiency, and when the airflow hypervelocity flowed out the impeller root in addition, the airflow will be in disorder around running, the disorder stream appears, and these disorder streams collide each other with surrounding material, will produce the abnormal sound, influence the air current normal operating scheduling problem.

Therefore, it is necessary to redesign a structure of the air duct system suitable for the brushless motor.

[ summary of the invention ]

The invention aims to solve the technical problem of avoiding the defects of the prior art and provides an air duct system component and a fixed impeller thereof, wherein the air duct system component has the advantages of reasonable structure, small volume, light weight and the like, the air duct system component is used for a brushless motor, and the brushless motor has the advantages of high rotating speed, large suction force, low noise, high efficiency and the like.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the air duct system component is used on a brushless motor which can be used on products such as a dust collector and the like, and comprises a hollow fan cover, an impeller and a fixed impeller, wherein the two ends of the hollow fan cover are provided with openings; the wind cover comprises a rear end part which is fixedly connected with the front end of the shell of the brushless motor and a front end part which is connected with the rear end part, is hollow inside and is trumpet-shaped, the diameter of the joint part at the joint of the rear end part and the front end part is smaller than the diameter of the opening end of the rear end part and the front end part, the radial size of the joint part to the opening end of the front end part is gradually increased to enable the front end part to be in a horn shape, the rear end part of the fan cover is internally provided with a front bearing fixing block, the front bearing fixing block is fixed on the inner wall of the rear end part of the fan cover through at least two first ribs, a first air duct for air flow circulation is formed between every two adjacent first ribs, the front bearing fixing block is provided with a front bearing chamber capable of accommodating a front bearing of the brushless motor, and the front end part is provided with a trumpet-shaped first circular truncated cone-shaped cavity matched with the impeller; the impeller is provided with an opening at one end and is horn-shaped, and comprises a horn-shaped wheel disc, a wheel disc bottom and a plurality of first blades, wherein the wheel disc bottom is connected with the wheel disc, the radial size of the impeller disc bottom is gradually increased from the wheel disc bottom to the opening end of the wheel disc to form the horn-shaped impeller, so that the inner surface of the wheel disc is a horn-shaped second truncated cone-shaped cavity, the plurality of first blades are uniformly arranged on the outer surface of the wheel disc to form an integrated structure with the outer surface of the wheel disc, a second air duct for air flow circulation is formed between every two adjacent first blades, and the bottom of the wheel disc is provided with a central through hole matched with the front end of a rotating shaft of a rotor assembly of the brushless motor; the fixed impeller comprises an outer cylindrical part with openings at two ends and hollow inside, an inner cylindrical part with openings at two ends and hollow inside and a central cylindrical part; the inner cylindrical part is fixed on the inner wall of the outer cylindrical part through a plurality of second blades, and a fifth air channel for air flow circulation is formed between every two adjacent second blades; the central cylindrical part is fixed on the inner wall of the inner cylindrical part through at least two fourth ribs; the impeller is fixed at the front end of a rotating shaft of the brushless motor and is positioned in the first truncated cone-shaped cavity at the front end part of the fan cover, the bottom of a wheel disc of the impeller is close to the bottom of the first truncated cone-shaped cavity at the front end part of the fan cover, and an air duct gap is formed between the outer end surface of each first blade on the outer surface of the wheel disc of the impeller and the inner surface of the first truncated cone-shaped cavity at the front end part of the fan cover; the outer cylindrical part of the fixed impeller is fixed on the front end part of the fan cover; the first air duct and the first truncated cone-shaped cavity of the fan cover, the first blades and the second air duct of the impeller, and the fifth air duct of the fixed impeller together form an air duct through which air flows in the air duct system component.

The height of each first blade is gradually reduced from the air inlet end to the air outlet end.

The thickness of each first blade gradually increases from the air inlet end to the air outlet end.

And each first blade is uniformly arranged on the outer surface of the wheel disc in an inclined mode along the rotation direction of the brushless motor.

Along the rotating direction of the brushless motor, when each first blade is uniformly arranged on the outer surface of the wheel disc in an inclined mode, the inclined angle of the first blade is increased from the wind port end and then reduced.

Two side surfaces of the contact part of each first blade and the outer surface of the wheel disc are arc-shaped contact surfaces.

The joint part of each adjacent surface of the first blade is designed into an arc shape.

Each second vane is arc-shaped and uniformly inclined on the outer surface of the inner cylindrical portion and the inner wall of the outer cylindrical portion.

The fixed impeller is used on a motor, particularly a brushless motor, and comprises an outer cylindrical part with two openings at two ends and hollow inside, an inner cylindrical part with two openings at two ends and hollow inside, and a central cylindrical part; the inner cylindrical part is fixed on the inner wall of the outer cylindrical part through a plurality of second blades, and a fifth air channel for air flow circulation is formed between every two adjacent second blades; the central cylindrical part is fixed on the inner wall of the inner cylindrical part through at least two fourth ribs.

Compared with the prior art, the air duct system component and the fixed impeller thereof have the beneficial effects that:

firstly, the impeller of the air duct system component is set to be in an oblique flow type with a special structure, the structure of the fan cover is changed correspondingly, so that the size of the whole air duct system component is small, the weight of the whole air duct system component is light, the air duct system of the brushless motor is changed, the air inlet mode of the air flow is different from that of the air duct system of the motor in the prior art, and the structure of the brushless motor can adopt a sectional type to isolate dust; by adopting the structure of the air duct system component and the fixed impeller thereof, the maximum rotating speed of the motor can reach 11-13 ten thousand revolutions per minute, which is much higher than the maximum rotating speed of 6-8 ten thousand revolutions per minute of the motor of the dust collector in the prior art;

the impeller of the invention also improves the distribution condition of the first blades in a uniform and inclined manner on the outer surface of the wheel disc, and then adjusts the thickness and height distribution of the first blades, thereby improving the airflow separation state of the air inlet area of the impeller, reducing airflow loss and reducing noise;

thirdly, a fixed impeller is sleeved on the impeller and the wind shield at the position of the wind outlet, a plurality of second blades are designed in the fixed impeller, the second blades are designed into an arc shape and are uniformly inclined on the outer surface of the inner cylindrical part and the inner wall of the outer cylindrical part of the fixed impeller, airflow is guided, and a series of defects caused by mutual collision of the airflow and the like are reduced;

fourthly, by adopting the structure of the air duct system component, the channels for the air flow circulation of the brushless motor are different, and a part of air flow enters the shell of the brushless motor from the fourth air ducts of the rear cover of the brushless motor and then enters the air duct system component through the third air ducts in the shell; another part of the airflow enters the shell from each window of the shell, passes through each third air duct in the shell and then enters the air duct system component; after the airflow entering the air duct system component flows into the second air duct of the impeller through the first air duct and the first truncated cone-shaped cavity of the fan cover, the airflow flows out of the fifth air duct of the fixed impeller.

In summary, the air duct system component and the fixed impeller thereof have the advantages of reasonable structure, small volume, light weight and the like, and the air duct system component is used on the brushless motor, so that the brushless motor has the advantages of high rotating speed, large suction force, low noise, high efficiency and the like.

[ description of the drawings ]

FIG. 1 is a schematic isometric view of an air duct system component of the present invention after use on a brushless motor;

FIG. 2 is a schematic perspective view of the brushless motor in another direction;

FIG. 3 is a front cross-sectional schematic orthographic view of the brushless motor, wherein each dotted line represents a path of airflow, and an arrow on the dotted line represents a direction of airflow;

FIG. 4 is a schematic perspective view of the brushless motor after being disassembled;

FIG. 5 is a schematic perspective view of the housing of the brushless motor;

FIG. 6 is an orthographic cross-sectional view of the housing;

FIG. 7 is a schematic axial view of a stator core of the brushless motor;

FIG. 8 is a schematic isometric view of a ductwork component according to the present invention;

FIG. 9 is a schematic perspective view of another direction of the components of the ductwork

FIG. 10 is an orthographic cross-sectional front view of the ductwork components, wherein dashed lines indicate the path of airflow, and wherein arrows on the dashed lines indicate the direction of airflow;

FIG. 11 is an isometric projection of the ductwork components shown exploded;

FIG. 12 is one of the schematic axonometric views of the impeller of the ductwork component;

FIG. 13 is a second schematic isometric view of the impeller;

FIG. 14 is a third schematic isometric view of the impeller;

FIG. 15 is a schematic orthographic view of the impeller from above;

FIG. 16 is a front perspective view of the impeller;

FIG. 17 is a front perspective rear view of the impeller;

FIG. 18 is a schematic cross-sectional view of A-A shown in FIG. 17;

FIG. 19 is a schematic isometric view of a stationary vane of the ductwork component;

FIG. 20 is a schematic perspective view of the stator vane wheel in another orientation;

FIG. 21 is a front elevation schematic view of the stator vane;

FIG. 22 is a schematic cross-sectional view of B-B shown in FIG. 21;

FIG. 23 is a schematic cross-sectional view of C-C shown in FIG. 21;

FIG. 24 is an isometric view of the hood of the ductwork component;

fig. 25 is a schematic axonometric projection of the wind shield in another direction.

[ detailed description ] embodiments

The present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 3, 8-25, an air duct system member 60 for use on a brushless motor; the air duct system member 60 includes a hollow fan housing 61 with openings at both ends, an impeller 62 and a fixed impeller 63; the wind shield 61 comprises a rear end portion 611 connected and fixed with the front end of the housing 10 of the brushless motor and a front end portion 612 which is connected with the rear end portion 611 and is hollow and trumpet-shaped, the diameter of a joint portion 613 at the joint of the rear end portion 611 and the front end portion 612 is smaller than the diameters of the open ends of the rear end portion 611 and the front end portion 612, the radial dimension of the joint portion 613 to the open end of the front end portion 612 is gradually increased to form the front end portion 612 into a trumpet shape, a front bearing fixing block 6111 is arranged in the rear end portion 611 of the wind shield 61, the front bearing fixing block 6111 is fixed on the inner wall of the rear end portion 611 of the wind shield 61 through at least two first ribs 6112, first air ducts 6113 for air flow circulation are formed between two adjacent first ribs 6112, four first air ducts 6112 are correspondingly arranged, the front bearing fixing block 6111 is provided with a front bearing chamber 61111 capable of accommodating the front bearing 51 of the brushless motor, the front end portion 612 is provided with a trumpet-shaped first truncated cone-shaped containing cavity 6121 matched with the impeller 62; one end of the impeller 62 is open and trumpet-shaped, and comprises a trumpet-shaped wheel disc 621, a wheel disc bottom 622 connected with the wheel disc 621 and a plurality of first blades 623, wherein the radial size of the impeller from the wheel disc bottom 622 to the open end of the wheel disc 621 is gradually increased to form a trumpet shape, so that the inner surface of the wheel disc 621 is a trumpet-shaped second truncated cone-shaped containing cavity 6211, the plurality of first blades 623 are uniformly arranged on the outer surface of the wheel disc 621 to form an integrated structure with the outer surface of the wheel disc 621, and a second air duct 624 for air flow circulation is formed between two adjacent first blades 623; the fixed impeller 63 includes an outer cylindrical portion 631 having both open ends and a hollow interior, an inner cylindrical portion 632 having both open ends and a central cylindrical portion 633; the inner cylindrical portion 632 is fixed on the inner wall of the outer cylindrical portion 631 through a plurality of second blades 634, the plurality of second blades 634 are arc-shaped and uniformly inclined on the outer surface of the inner cylindrical portion 632 and the inner wall of the outer cylindrical portion 631, and a fifth air channel 635 for air flow circulation is formed between every two adjacent second blades 634; the central cylindrical part 633 is fixed on the inner wall of the inner cylindrical part 632 through at least two fourth ribs 636, and the number of the fourth ribs 636 is four; a central through hole 6221 at the bottom 622 of the wheel disc of the impeller 62 is fixedly sleeved at the front end of the rotating shaft 31 of the brushless motor, so that the impeller 62 is fixed at the front end of the rotating shaft 31 of the brushless motor and is located in a first circular truncated cone-shaped cavity 6121 at the front end 612 of the fan housing 61, the bottom 622 of the wheel disc of the impeller 62 is close to the bottom of the first circular truncated cone-shaped cavity 6121 at the front end 612 of the fan housing 61, and an air duct gap is formed between the outer end surface of each first blade 623 located on the outer surface of the wheel disc 621 of the impeller 62 and the inner surface of the first circular truncated cone-shaped cavity 6121 at the front end 612 of the fan housing 61; the first air duct 6113 and the first circular truncated cone-shaped cavity 6121 of the fan housing 61, the first blades 623 and the second air duct 624 of the impeller 62, and the fifth air duct 635 of the fixed impeller 63 together form an air duct through which air flows in the air duct system member 60. The horn-shaped structure described in the present invention can also be described as a truncated cone-shaped structure, which is hollow and has a certain wall thickness.

In the brushless motor in the prior art, when airflow flows out of the root of the impeller at a super high speed, the airflow can run around randomly and generate random flows, and the random flows collide with surrounding substances to generate abnormal sound, so that the normal operation of the airflow is influenced; referring to fig. 1 to 4, 8 to 12, and 19 to 25, in order to overcome this drawback, after many designs and tests, a fixed impeller 63 is specially sleeved on the impeller 62 and the fan housing 61 at the air outlet position, a plurality of second blades 634 are designed in the fixed impeller 63, the second blades 634 are designed to be arc-shaped and uniformly inclined on the outer surface of the inner cylindrical portion 632 and the inner wall of the outer cylindrical portion 631 of the fixed impeller 63, so as to guide the air flow, and alleviate a series of problems caused by collision of the air flows and the like.

Referring to fig. 1 to 25, the air duct system member of the present invention is used in a brushless motor including a housing 10 having both ends open and a hollow inside, a stator assembly 20, a rotor assembly 30, a rear cover 40 provided with a rear bearing chamber 45, a front bearing 51, and a rear bearing 52; the stator assembly 20 includes a stator core 21 and stator windings (not shown) disposed in respective stator slots 211 of the stator core 21, for example, a brushless motor of the applicant has a stator core 21 with 3 stator slots 211; the rotor assembly 30 includes a rotating shaft 31 and a permanent magnet part 32 fixed on the rotating shaft 31; the brushless motor further includes an air duct system member 60 embodying the present invention; a stator assembly fixing block 11 is arranged in the shell 10, the stator assembly fixing block 11 is fixed on the inner wall of the shell 10 through at least two second ribs 12, a third air duct 13 for air flow circulation is formed between every two adjacent second ribs 12, the number of the second ribs 12 is four, the number of the third air ducts 13 is four correspondingly, the length of the stator assembly fixing block 11 is smaller than that of the shell 10, and the stator assembly fixing block 11 is provided with a first central through hole 111 capable of fixing the stator assembly 20; the front end of the stator assembly 20 is fixed on the first central through hole 111 of the stator assembly fixing block 11 of the housing 10; a rear bearing 52 is disposed in the rear bearing chamber 45 of the rear cover 40, and the rear cover 40 is fixed to the rear end of the housing 10; the front bearing 51 is arranged in a front bearing chamber 61111 of a front bearing fixing block 6111 of the fan housing 61, and the rear end 611 of the fan housing 61 is fixed at the front end of the shell 10; the rear end of the rotating shaft 31 of the rotor assembly 30 is inserted into the inner hole of the rear bearing 52, the front end of the rotating shaft 31 of the rotor assembly 30 passes through the inner hole of the front bearing 51, the permanent magnet component 32 of the rotor assembly 30 is located in the inner cavity of the stator core 21 of the stator assembly 20, the central through hole 6221 at the bottom 622 of the wheel disc of the impeller 62 is fixedly sleeved on the front end of the rotating shaft 31, so that the impeller 62 is fixed on the front end of the rotating shaft 31 and located in the first circular truncated cone-shaped cavity 6121 at the front end 612 of the fan housing 61, the bottom 622 of the wheel disc of the impeller 62 is close to the bottom of the first circular truncated cone-shaped cavity 6121 at the front end 612 of the fan housing 61, and an air duct gap is formed between the outer end surface of each first blade 623 located on the outer surface of the wheel disc 621 of the impeller 62 and the inner surface of the first circular truncated cone-shaped cavity 6121 at the front end 612 of the fan housing 61.

Referring to fig. 12 to 18, in order to facilitate smooth air flow and easy air flow, the height of each first blade 623 gradually decreases from the air inlet end to the air outlet end. As can be seen from fig. 3, the air flow flows from the end of the disk bottom 622 of the impeller 62 to the open end of the disk 621 of the impeller 62, so that the end of each first blade 623 close to the disk bottom 622 of the impeller 62 of the present invention is an air inlet end, and the end far away from the disk bottom 622, i.e. the open end of the disk 621 of the impeller 62, is an air outlet end, so that, it can also be said, the height of each first blade 623 gradually decreases from the end close to the disk bottom 622 to the direction of the open end of the disk 621; specifically, each first vane 623 has a height H at the air intake end₁Is the largest and eachHeight H of first blade 623 at air outlet end₂Is the smallest. For example, the applicant has an impeller 62 with first blades 623 each having a height H at the air inlet end₁5.0 mm, and the height H of each first blade 623 at the outlet end₂But only 3.5 mm, so that the air flow tends to come together at the entry and to spread at the exit.

Referring to fig. 12 to 18, the thickness of each first blade 623 gradually increases from the air inlet end to the air outlet end, and it can also be said that the thickness of each first blade 623 gradually increases from the end near the bottom 622 of the wheel disc to the open end of the wheel disc 621; specifically, the thickness T of each first vane 623 at the air intake end₁Is the smallest, and the thickness T of each first vane 623 at the outlet end₂Is the largest. For example, the applicant has an impeller 62 in which the thickness T of each first vane 623 at the air inlet end₁Only 0.1 mm, and the thickness T of each first blade 623 at the air outlet end₂But reaches 0.9 mm. The first blades 623 at the air inlet end are thin, so that air flow can easily enter, but when the motor rotates at a high speed, the air flow collides with each other when flowing, so that the problems of blade deformation, high noise and the like can occur when the blades are thin, therefore, the thickness of each first blade 623 is gradually increased from the air inlet end to the air outlet end, so that the air flow can easily enter, the strength of each first blade 623 is increased, and the noise when flowing is reduced.

Referring to fig. 12 to 18, each first blade 623 is uniformly disposed on the outer surface of the disc 621 in a tilted manner along the rotation direction of the brushless motor; along the rotation direction of the brushless motor, when the first blades 623 are uniformly arranged on the outer surface of the wheel disc 621 in an inclined manner, the inclination angle is increased from the air inlet end and then decreased, so that when the brushless motor rotates at a high speed, air flow is easily sucked, and fluid loss at the air inlet end can be effectively reduced.

Referring to fig. 12 to 17, the joint portion of each adjacent surface of the first vane 623 is designed in an arc shape; each adjacent surface of the first blade 623 comprises an air inlet end face 6231 of the first blade 623, an upper end face 6232 of the first blade 623, an air outlet end face 6233 of the first blade 623, a first side face 6234 of the first blade 623 and a second side face 6235 of the first blade 623, wherein the first side 6234 of the first blade 623 is the side of the first blade 623 at an angle less than 90 degrees to the outer surface of the disk 621, the second side face 6235 of the first blade 623 is a side face at which the angle between the first blade 623 and the outer surface of the wheel disc 621 is greater than 90 degrees, and the joint of each adjacent face of the first blade 623 is designed into an arc shape, specifically, the joint of the air inlet end face 6231 of the first blade 623 and the second side face 6235 of the first blade 623, the joint of the air outlet end face 6233 of the first blade 623 and the first side face 6234 of the first blade 623, and the joint of the air outlet end face 6233 of the first blade 623 and the second side face 6235 of the first blade 623 are designed into an arc shape; the joint between the air inlet end face 6231 of the first blade 623 and the upper end face 6232 of the first blade 623, the joint between the air inlet end face 6231 of the first blade 623 and the first side face 6234 of the first blade 623, the joint between the upper end face 6232 of the first blade 623 and the second side face 6235 of the first blade 623, and the joint between the upper end face 6232 of the first blade 623 and the air outlet end face 6233 of the first blade 623 are not designed into an arc shape and directly form a straight edge; this has the advantage that the air flow passing through the second air channel 624 between the first blades 623 is discharged very smoothly, and the first blades 623 are prevented from blocking the air flow back when the impeller 62 rotates at a high speed.

Referring to fig. 12 to 17, both side surfaces of the contact portion of each first blade 623 and the outer surface of the wheel disc 621 are arc-shaped contact surfaces 625, that is, the contact portion of the first side surface 6234 of each first blade 623 and the outer surface of the wheel disc 621 and the contact portion of the second side surface 6235 of each first blade 623 and the outer surface of the wheel disc 621 are arc-shaped contact surfaces 625, so that the tail end of each first blade 623 is designed into an arc shape, which is more convenient for the air flow to flow out easily, and reduces the loss of the air flow at the wake of each first blade 623.

Referring to fig. 1, 2, 4 and 5, the outer surface of the rear end of the housing 10 is provided with at least two windows 19 communicated with the inner surface, and the outer surface of the rear end of the housing 10 is symmetrically provided with four windows 19 communicated with the inner surface.

Referring to fig. 1 and 4, the rear cover 40 is also hollow with openings at both ends, the rear bearing chamber 45 is located on the rear bearing chamber fixing block 41, the rear bearing chamber fixing block 41 is fixed on the inner wall of the rear cover 40 by at least two third ribs 42, and a fourth air duct 43 for air flow circulation is formed between two adjacent third ribs 42; the third ribs 42 of the present invention have four positions corresponding to the four positions of the fourth air ducts 43.

Referring to fig. 3 and 10, dashed lines indicate the path of airflow, with arrows on the dashed lines indicating the direction of airflow; a part of the air flow enters the housing 10 from the fourth air ducts 43 of the rear cover 40, passes through the third air ducts 13 in the housing 10, and enters the air duct system member 60; a further portion of the air flow enters the housing 10 through the windows 19 in the housing 10 and then through the third air ducts 13 in the housing 10 into the air duct system member 60. After the airflow entering the air duct system member 60 flows into the second air duct 624 of the impeller 62 through the first air duct 6113 and the first circular truncated cone-shaped cavity 6121 of the fan housing 61, the airflow flows out from the fifth air duct 635 of the fixed impeller 63.

Referring to fig. 5 and 6, the housing 10, the stator assembly fixing block 11 and the ribs 12 are actually the same component, but they may be assembled by different components.

Referring to fig. 3 and 10, the rear cover 40 and the rear bearing chamber 45 thereof, the housing 10 and the first central through hole 111 of the stator assembly fixing block 11 thereof, the rear end 611 of the wind shield 61 and the front bearing chamber 61111 of the front bearing fixing block 6111 thereof, the front end 612 of the wind shield 61, and the impeller 62 share a common central axis.

Referring to fig. 1 to 6, the rear end surface of the rear cover 40 is further symmetrically provided with three axial bosses 44, the three axial bosses 44 are mainly used for fixing the control plate 99, so that the control plate 99 has a certain distance to allow the air flow to enter from the fourth air ducts 43 of the rear cover 40, and the control plate 99 is not shown in fig. 1 to 3. Referring to fig. 1 to 6, the rear end of the housing 10 is provided with a rear end inner spigot 14 adapted to the outer spigot 49 of the rear cover 40, and the front end of the housing 10 is provided with a front end inner spigot 15 adapted to the outer spigot 6119 of the rear end 611 of the wind shield 61; the first central through hole 111 of the stator assembly fixing block 11 of the casing 10 is divided into two stepped holes, wherein the first stepped hole 1111 is used for fixing the stator core 21 of the stator assembly 20, the second stepped hole 1112 is used for accommodating an end of a front bobbin (not shown) of the stator assembly 20, and an inner diameter of the first stepped hole 1111 is slightly larger than an inner diameter of the second stepped hole 1112.

Referring to fig. 3, 10 to 14 and 18, in order to ensure the matching length of the impeller 62 and the rotating shaft 31, so that the impeller 62 is more firmly fixed and operates more stably, a wheel disc bottom 622 of the impeller 62 is provided with a central cylinder 6229 with a certain length, a central through hole 6221 of the wheel disc bottom 622 penetrates through the central cylinder 6229, and the central cylinder 6229 protrudes at two axial sides of the wheel disc bottom 622 in order to save the axial size; in order to make the impeller 62 more structurally sound, the bottom 622 of the wheel disc projects outwardly a circle of convex disc bottom 6228, while in order to save weight, a cavity 6227 is provided between the convex disc bottom 6228 and the central cylinder 6229. The impeller 62 of the present invention can be referred to as a diagonal impeller, which is a great improvement over the centrifugal fan blades of the prior art, each part of the impeller 62 is integrally formed, and the material can be made of aluminum alloy or other materials such as a high-strength engineering plastic, the present applicant has an impeller 62 made of aluminum alloy, because the aluminum alloy material is lighter and has high strength, and the impeller 62 of the present invention has a special structure, so that the impeller 62 of the present invention can maintain sufficient strength to bear the relevant force when the motor rotates at high speed, and the impeller 62 of the present invention has a very firm integral structure; in addition, the impeller 62 of the present invention improves the distribution of the first blades 623 in a uniform and inclined manner on the outer surface of the wheel disc 621, and then adjusts the thickness and height distribution of the first blades 623, thereby improving the airflow separation state of the air intake region of the impeller 62, reducing the airflow loss, and reducing the noise. By adopting the impeller 62 with the special structure, the air duct clearance between the outer end surface of each first blade 623 on the outer surface of the wheel disc 621 of the impeller 62 and the inner surface of the first truncated cone-shaped cavity 6121 of the front end 612 of the fan cover 61 can be 0.1-0.3 mm, so that the impeller 62 and the fan cover 61 can be matched with each other with high precision, the air flow loss can be effectively reduced for a high-speed motor, and the noise problem is improved; in the prior art, the air duct gap between the impeller and the fan cover is large, generally, the minimum air duct gap can only reach 0.6-0.8 mm, the air duct gap is large, noise can be generated when air flows collide with each other, so that the air flow loss is large, and the motor product cannot reach better efficiency.

The brushless motor adopting the air duct system component and the fixed impeller structure thereof can enable the highest rotating speed of the brushless motor to reach 11-13 ten thousand revolutions per minute, which is much higher than the highest rotating speed of 6-8 ten thousand revolutions per minute of the motor of the dust collector in the prior art; the air duct system component of the invention adopts an oblique flow impeller, the air duct system component is different, the air flow air inlet mode is different from that of a dust collector motor in the prior art, a brushless motor adopting the air duct system component of the invention can adopt sectional type dust isolation, a dust collector product firstly isolates large-particle dust outside the brushless motor and allows fine-particle dust to enter the brushless motor, and the large-particle dust is isolated again at the air outlet end of the brushless motor, so that the air inlet system of the brushless motor is changed, the working efficiency of the brushless motor is improved, the suction force of the brushless motor is fully utilized, and the brushless motor adopting the air duct system component of the invention has the advantages of large suction force, small volume, light weight, small noise, high efficiency and the like.

It should be noted that, for those skilled in the art, changes and modifications can be made without departing from the spirit of the invention, and therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. An air duct system component is used on a brushless motor; it is characterized in that: It comprises a hood (61) with an inner hollow opening at both ends, an impeller (62) and a fixed impeller (63); the hood (61) comprises a rear end (611) and is connected with the rear end (611) and The inner hollow and trumpet-shaped front end portion (612), the diameter of the joint portion (613) where the rear end portion (611) and the front end portion (612) are connected is larger than the diameter of the rear end portion (611) and the front end portion The diameters of the opening ends of (612) are all small, and the radial dimension of the opening end of the front end (612) from the joint (613) gradually increases so that the front end (612) is formed into a trumpet shape, so A front bearing fixing block (6111) is arranged in the rear end (611) of the wind cover (61), and the front bearing fixing block (6111) is fixed to the wind cover (6112) by at least two first ribs (6112). 61) On the inner wall of the rear end (611), a first air duct (6113) for air flow is formed between two adjacent first ribs (6112), and the front bearing fixing block (6111) is provided with a front a bearing chamber (61111), the front end portion (612) is provided with a first circular frustum-shaped cavity (6121) that cooperates with the impeller (62) and is trumpet-shaped; The impeller (62) is open at one end and is trumpet-shaped, and includes a trumpet-shaped wheel disc (621), a wheel disc bottom (622) connected with the wheel disc (621), and a plurality of first blades (623), From the bottom of the roulette (622) to the open end of the roulette (621), the radial dimension gradually increases to form a trumpet shape, so that the inner surface of the roulette (621) is a trumpet-shaped second truncated cone A cavity (6211) is formed, a plurality of first blades (623) are evenly arranged on the outer surface of the wheel disc (621) to form an integral structure with the outer surface of the wheel disc (621), two adjacent first blades A second air duct (624) for air flow is formed between (623), and a central through hole (6221) is provided at the bottom of the wheel disc (622); The fixed impeller (63) includes an outer cylindrical portion (631) with both ends open and hollow inside, an inner cylindrical portion (632) with both ends open and hollow inside, and a central cylindrical portion (633); the inner cylindrical portion (632) passes through a plurality of The second blades (634) are fixed on the inner wall of the outer cylindrical portion (631), and a fifth air channel (635) for airflow is formed between two adjacent second blades (634); the central cylindrical portion (633) ) is fixed on the inner wall of the inner cylindrical portion (632) by at least two fourth ribs (636); The impeller (62) is fixed at the front end of the rotating shaft of the brushless motor and is located in the first circular frustum-shaped cavity (6121) of the front end (612) of the hood (61). The wheel disc of the impeller (62) The bottom (622) is close to the bottom of the first circular frustum-shaped cavity (6121) of the front end (612) of the hood (61). An air duct gap is formed between the outer end surface of the blade (623) and the inner surface of the first circular conical cavity (6121) of the front end (612) of the hood (61); the outer cylindrical portion (631) of the fixed impeller (63) is fixed on the front end (612) of the windshield (61); the first air duct (6113) and the first circular frustum-shaped cavity (6121) of the windshield (61) and the respective parts of the impeller (62) The first blade (623) and the second air duct (624), and the fifth air duct (635) of the fixed impeller (63) together constitute an air duct through which the airflow circulates in the air duct system component (60). 2. The air duct system component according to claim 1, wherein: The height of each first blade (623) gradually decreases from the air inlet end to the air outlet end. 3. The air duct system component according to claim 1, wherein: The thickness of each first blade (623) gradually increases from the air inlet end to the air outlet end. 4. The air duct system component according to claim 1, wherein: The first blades (623) are evenly arranged on the outer surface of the wheel disc (621) in an inclined manner along the rotation direction of the brushless motor. 5. The air duct system component according to claim 1, wherein: Along the rotation direction of the brushless motor, when each first blade (623) is evenly arranged on the outer surface of the wheel disc (621) in an inclined manner, the inclination angle of the first blade (623) first increases and then decreases from the tuyere end. 6. The air duct system component of claim 1, wherein: Both sides of each first blade (623) in contact with the outer surface of the wheel disc (621) are arc-shaped contact surfaces. 7. The air duct system component of claim 1, wherein: The connecting portion of each adjacent surface of the first blade (623) is designed in an arc shape. 8. The air duct system component according to any one of claims 1 to 7, wherein: Each second blade (634) is arc-shaped and evenly inclined on the outer surface of the inner cylindrical portion (632) and the inner wall of the outer cylindrical portion (631). 9. A fixed impeller (63), characterized in that: The fixed impeller (63) includes an outer cylindrical portion (631) with both ends open and hollow inside, an inner cylindrical portion (632) with both ends open and hollow inside, and a central cylindrical portion (633); the inner cylindrical portion (632) passes through a plurality of The second blades (634) are fixed on the inner wall of the outer cylindrical portion (631), and a fifth air channel (635) for airflow is formed between two adjacent second blades (634); the central cylindrical portion (633) ) is fixed on the inner wall of the inner cylindrical portion (632) by at least two fourth ribs (636). 10. The fixed impeller according to claim 9, wherein: Each second blade (634) is arc-shaped and evenly inclined on the outer surface of the inner cylindrical portion (632) and the inner wall of the outer cylindrical portion (631).

Images