CN212225567U - Air duct system component and fixed impeller thereof - Google Patents

Abstract

The utility model relates to an air duct system component and a fixed impeller thereof, wherein the air duct system component comprises a fan cover, an impeller and a fixed impeller; the fan cover comprises a rear end part and a front end part; the impeller comprises a wheel disc, a wheel disc bottom and a plurality of first blades, and the first blades are uniformly arranged on the outer surface of the wheel disc; the fixed impeller comprises an outer cylindrical part, an inner cylindrical part 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; 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 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 of the fan cover, and an air duct gap is formed between the outer end face of each first blade of the impeller and the inner surface of the first truncated cone-shaped cavity of the fan cover; the outer cylindrical part of the fixed impeller is fixed on the front end part of the fan cover. The utility model discloses the air duct system component has rational in infrastructure, small and advantage such as light in weight.

Description

Air duct system component and fixed impeller thereof

[ technical field ] A method for producing a semiconductor device

The present invention relates to a miniature or micro-motor, and more particularly to a miniature or micro-brushless motor, such as a brushless motor for a vacuum cleaner, and more particularly to a ductwork member for a brushless motor.

[ 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.

[ Utility model ] content

The to-be-solved technical problem of the utility model lies in avoiding the weak point of above-mentioned prior art and providing a ducted system component and decide impeller thereof, has advantages such as rational in infrastructure, small and light in weight, and this ducted system component is used for brushless motor, and brushless motor has advantages such as the rotational speed is high, suction is big, the noise is little and efficient.

The utility model provides a technical scheme that technical problem adopted is:

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; 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 utility model discloses air duct system component and decide beneficial effect of impeller lie in:

firstly, the utility model discloses set the impeller of air duct system component to the diagonal flow formula of special construction, the structure of fan housing has also made corresponding change, make whole air duct system component small and light in weight, make brushless motor's air duct system change, the air current air inlet mode is different with the air duct system of prior art motor, make brushless motor's structure can adopt the sectional type to keep apart the dust, the dust catcher product of the brushless motor who is equipped with the utility model discloses air duct system component keeps apart the large granule dust outside brushless motor first, fills the tiny granule dust and gets into inside brushless motor, keeps apart once more at brushless motor's air outlet end, has changed brushless motor's air inlet system, promotes brushless motor's work efficiency, make full use of brushless motor's suction; 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 turns/minute, which is much higher than the maximum rotating speed of 6-8 ten thousand turns/minute of the motor of the dust collector in the prior art;

secondly, the impeller of the utility model also improves the distribution condition of each first blade on the outer surface of the wheel disc in a uniform and inclined way, and then adjusts the thickness and height distribution of each first blade, thereby improving the airflow separation state of the air inlet area of the impeller, reducing the airflow loss and reducing the noise;

thirdly, the fixed impeller is sleeved on the impeller and the wind shield at the position of the air 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, the air flow is guided, and a series of defect problems caused by mutual collision of the air flow and the like are reduced;

fourthly, the structure of the air duct system component of the utility model is adopted, so that 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 each fourth air duct of the rear cover of the brushless motor and enters the air duct system component after passing through each third air duct 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.

To sum up, the utility model discloses air duct system component and stator vane thereof have advantages such as rational in infrastructure, small and light in weight, and this air duct system component is used for brushless motor has advantages such as the rotational speed is high, suction is big, the noise is little and efficient.

[ description of the drawings ]

FIG. 1 is a schematic perspective view of the air duct system of the present invention after being used 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 perspective view of the ductwork components of 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 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 includes a rear end portion 611 connected and fixed to the front end of the housing 10 of the brushless motor, and a front end portion 612 coupled to the rear end portion 611, and having a hollow and horn shape, a diameter of a joint portion 613 at a coupling portion of the rear end portion 611 and the front end portion 612 is smaller than 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 toward the open end of the front end portion 612 gradually increases to form the front end portion 612 into a horn shape, a front bearing fixing block 6111 is disposed in the rear end portion 611 of the wind shield 61, the front bearing fixing block 6111 is fixed to the inner wall of the rear end portion 611 of the wind shield 61 through at least two first ribs 6112, and first air ducts 6113 through which air flows are formed between two adjacent first ribs 6112, there are four first air ducts 6113 correspondingly, the front bearing fixing block 6111 is disposed 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; the impeller 62 is open at one end and is 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 wheel disc bottom 622 is gradually enlarged to the open end of the wheel disc 621 in the radial direction 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 and form an integrated structure with the outer surface of the wheel disc 621, and a second air channel 624 for air flow circulation is formed between every 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 duct 635 for air flow circulation is formed between every two adjacent second blades 634, the utility model discloses a there are ten second blades 634, and correspondingly there are ten fifth air ducts 635; 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 of the utility model 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 round table-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 component of the present invention is used in a brushless motor, which includes a hollow housing 10 with two open ends, a stator assembly 20, a rotor assembly 30, a rear cover 40 having 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 also comprises an air duct system component 60 adopting the utility model; 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 airflow circulation is formed between every two adjacent second ribs 12, the second ribs 12 of the utility model are provided with four parts, correspondingly, the third air ducts 13 are provided with four parts, the length of the stator assembly fixing block 11 is less 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.

Referring to fig. 12 to 18, in order to facilitate smooth air flow and easy air flow, each first vane 623 has a height from the inlet airThe direction from the opening end to the air outlet end is gradually reduced. 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 the height H of each first blade 623 at the 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 thickness of each first blade 623 of air inlet end is thinner, leads to the air current to get into very easily like this, but because when the motor is high-speed rotatory, the mutual collision of air current when the air current circulates, the blade has thinned will appear blade deformation and the higher scheduling problem of noise, consequently the utility model discloses increase gradually the thickness of each first blade 623 from the air inlet end to the direction of air outlet end on purpose, just so not only make the air current get into very easily, make the intensity of each first blade 623 increase moreover, the noise when the air current circulates can reduce.

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, at least two windows 19 communicated with the inner surface are opened on the outer surface of the rear end of the housing 10, and four windows 19 communicated with the inner surface are symmetrically opened on the outer surface of the rear end of the housing 10.

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 utility model discloses a third rib 42 has four, and correspondingly fourth wind channel 43 has everywhere.

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 utility model discloses impeller 62 can be called diagonal flow impeller, and this diagonal flow impeller has very big improvement compared with prior art centrifugal fan blade, and impeller 62's each position integrated into one piece, the material can use aluminum alloy or other materials for example a high strength engineering plastics to make, the applicant has an impeller 62 and just adopts the aluminum alloy to make, because the aluminum alloy material is lighter and intensity is high, in addition the utility model discloses impeller 62 is special structure, makes the utility model discloses impeller 62 can keep enough intensity in order to bear the relevant power when the motor rotates at a high speed, the utility model discloses impeller 62 overall structure is very firm; and the utility model discloses impeller 62 is through improving the distribution situation of each first blade 623 at the even tilting of rim plate 621 outer surface, and the thickness and the high distribution of each first blade 623 are readjusted to improve the regional air current separation state of impeller 62 air inlet, reduced the air loss, reduced the noise. By adopting the impeller 62 with the special structure of the utility model, the air duct clearance between the outer end face 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 housing 61 can be 0.1-0.3 mm, so that the impeller 62 and the fan housing 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 of the utility model can lead the highest rotating speed of the brushless motor to reach 11-13 ten thousand rpm, which is much higher than the highest rotating speed of 6-8 ten thousand rpm of the motor of the dust collector in the prior art; the utility model discloses the ducted system component adopts the diagonal flow formula impeller, the ducted system component is different, and the air current air inlet mode is different with prior art dust catcher motor, adopts the utility model discloses the brushless motor of ducted system component can adopt the sectional type to keep apart the dust, and the dust catcher product is kept apart the large granule dust earlier outside brushless motor, and it is inside that tiny granule dust gets into brushless motor to permit, keeps apart once more at brushless motor's air outlet end, has changed brushless motor's air inlet system, promotes brushless motor's work efficiency, make full use of brushless motor's suction, make to adopt the utility model discloses the brushless motor of ducted system component has that suction is big, small, light in weight, the noise is little and efficient advantage.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but it is not understood to limit the scope of the invention, it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention, therefore, all the equivalent changes and modifications made with the scope of the claims of the present invention shall belong to the coverage of the claims of the present invention.

Claims (10)

1. An air duct system component for use on a brushless motor; the method is characterized in that:

comprises a fan cover (61) with two openings at two ends and a hollow inner part, an impeller (62) and a fixed impeller (63); the fan cover (61) comprises a rear end part (611) and a front end part (612) which is connected with the rear end part (611), is hollow and trumpet-shaped, the diameter of a connecting part (613) at the connecting part of the rear end part (611) and the front end part (612) is smaller than the diameters of the opening ends of the rear end part (611) and the front end part (612), the radial size of the connecting part (613) to the opening end of the front end part (612) is gradually increased to enable the front end part (612) to be trumpet-shaped, a front bearing fixing block (6111) is arranged in the rear end part (611) of the fan cover (61), the front bearing fixing block (6111) is fixed on the inner wall of the rear end part (611) of the fan cover (61) through at least two first ribs (6112), a first air duct (6113) for air flow circulation is formed between every two adjacent first ribs (6112), and the front bearing fixing block (6111) is provided with a front bearing chamber (61111), the front end part (612) is provided with a trumpet-shaped first circular truncated cone-shaped cavity (6121) matched with the impeller (62);

the impeller (62) is provided with an opening at one end and is horn-shaped, and comprises a horn-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 opening end of the wheel disc (621) is gradually increased from the wheel disc bottom (622) to the opening end of the wheel disc (621) to form a horn shape, so that a second frustum-shaped cavity (6211) in which the inner surface of the wheel disc (621) is horn-shaped is formed, 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), a second air channel (624) for air flow circulation is formed between every two adjacent first blades (623), and the wheel disc bottom (622) is provided with a central through hole (;

the fixed impeller (63) comprises an outer cylindrical part (631) with two open ends and hollow inside, an inner cylindrical part (632) with two open ends and hollow inside and a central cylindrical part (633); the inner cylindrical part (632) is fixed on the inner wall of the outer cylindrical part (631) through a plurality of second blades (634), and a fifth air duct (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);

the impeller (62) is fixed at the front end of a rotating shaft of the brushless motor and is positioned in a first truncated cone-shaped cavity (6121) of the front end part (612) of the fan cover (61), the bottom (622) of a wheel disc of the impeller (62) is close to the bottom of the first truncated cone-shaped cavity (6121) of the front end part (612) of the fan cover (61), and an air duct gap is formed 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 part (612) of the fan cover (61); the first air duct (6113) and the first circular truncated cone-shaped cavity (6121) of the fan cover (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) form an air duct through which air flows in the air duct system component (60).

2. The air duct system member of 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 member of 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 member of claim 1, wherein:

the first blades (623) are uniformly arranged on the outer surface of the wheel disc (621) in a tilting manner along the rotation direction of the brushless motor.

5. The air duct system member of claim 1, wherein:

along the rotating 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 mode, the inclined angle of the first blades is increased from the wind inlet end and then is reduced.

6. The air duct system member of claim 1, wherein:

two side surfaces of the contact part of each first blade (623) and the outer surface of the rotary disc (621) are arc-shaped contact surfaces.

7. The air duct system member of claim 1, wherein:

the joint of each adjacent surface of the first vane (623) is designed into an arc shape.

8. An air duct system member according to any one of claims 1 to 7, characterised in that:

each of the second vanes 634 is curved and uniformly inclined on the outer surface of the inner cylindrical portion 632 and the inner wall of the outer cylindrical portion 631.

9. A stator vane (63) of a ductwork component according to claim 1, characterized in that:

the fixed impeller (63) comprises an outer cylindrical part (631) with two open ends and hollow inside, an inner cylindrical part (632) with two open ends and hollow inside and a central cylindrical part (633); the inner cylindrical part (632) is fixed on the inner wall of the outer cylindrical part (631) through a plurality of second blades (634), and a fifth air duct (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).

10. Stationary vane wheel (63) of a duct system component according to claim 9, characterized in that:

each of the second vanes 634 is curved and uniformly inclined on the outer surface of the inner cylindrical portion 632 and the inner wall of the outer cylindrical portion 631.

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