CN113708561A - Brushless motor and impeller thereof - Google Patents

Brushless motor and impeller thereof Download PDF

Info

Publication number
CN113708561A
CN113708561A CN202010430061.7A CN202010430061A CN113708561A CN 113708561 A CN113708561 A CN 113708561A CN 202010430061 A CN202010430061 A CN 202010430061A CN 113708561 A CN113708561 A CN 113708561A
Authority
CN
China
Prior art keywords
impeller
fixed
wheel disc
air
air duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010430061.7A
Other languages
Chinese (zh)
Inventor
曹天佑
罗斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Chiqu Motor Co ltd
Original Assignee
Dongguan Chiqu Motor Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongguan Chiqu Motor Co ltd filed Critical Dongguan Chiqu Motor Co ltd
Priority to CN202010430061.7A priority Critical patent/CN113708561A/en
Publication of CN113708561A publication Critical patent/CN113708561A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a brushless motor and an impeller thereof, wherein the brushless motor comprises a shell provided with a stator component fixing block, a stator component, a rotor component, a rear cover, a front bearing, a rear bearing and an air duct system component, wherein the air duct system component comprises a fan cover and an impeller; the fan cover comprises a rear end part and a front end part which are provided with front bearing fixing blocks; the front end of the stator assembly is fixed on a first central through hole of a stator assembly fixing block of the shell; the rear bearing is arranged in a rear bearing chamber of the rear cover, and the rear cover is fixed at the rear end of the shell; the front bearing is arranged in a front bearing chamber of the front bearing fixing block of the fan cover, and the rear end part of the fan cover is fixed at the front end of the shell; the rear end of a rotating shaft of the rotor assembly is inserted into an inner hole of the rear bearing, the front end of the rotating shaft penetrates through the inner hole of the front bearing, and the impeller is fixed at the front end of the rotating shaft and is positioned in a first circular truncated cone-shaped containing cavity at the front end of the fan cover. The brushless motor has the advantages of high rotating speed, large suction force, small volume, light weight, low noise, high efficiency and the like.

Description

Brushless motor and impeller thereof
[ technical field ] A method for producing a semiconductor device
The present invention relates to motors, and in particular to miniature or miniature brushless motors, such as those used on vacuum cleaners.
[ 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.
[ summary of the invention ]
The technical problem to be solved by the invention is to provide a brushless motor and an impeller thereof, which avoid the defects of the prior art and have the advantages of reasonable structure, high rotating speed, large suction force, small volume, light weight, low noise, high efficiency and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the brushless motor can be used on products such as a dust collector and the like, and comprises a shell with openings at two ends and a hollow interior, a stator assembly, a rotor assembly, a rear cover with a rear bearing chamber, a front bearing and a rear bearing; the stator assembly comprises a stator core and stator windings arranged in each stator slot of the stator core; the rotor assembly comprises a rotating shaft and a permanent magnet component fixed on the rotating shaft; the brushless motor further comprises an air duct system component, wherein the air duct system component comprises a hollow fan cover and an impeller, the two ends of the fan cover are provided with openings, and the inner part of the fan cover is hollow; the fan cover comprises a rear end part and a front end part, wherein the rear end part is fixedly connected with the front end of the shell, the inner part of the front end part is hollow and trumpet-shaped, the diameter of a joint part at the joint of the rear end part and the front end part is smaller than that of an opening end of the rear end part and that of the front end part, the radial size of the joint part from the joint part to the opening end of the front end part is gradually increased to enable the front end part to be trumpet-shaped, a front bearing fixing block is arranged in the rear end part of the fan cover and fixed on the inner wall of the rear end part of the fan cover through at least two first ribs, a first air channel 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 the front bearing, and the front end part is provided with a first truncated cone-shaped accommodating chamber matched with the impeller and in a trumpet shape; 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 channel 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 the rotor assembly; a stator assembly fixing block is arranged in the shell and fixed on the inner wall of the shell through at least two second ribs, a third air duct for air flow circulation is formed between every two adjacent second ribs, the length of the stator assembly fixing block is smaller than that of the shell, and the stator assembly fixing block is provided with a first central through hole capable of fixing the stator assembly; the front end of the stator assembly is fixed on a first central through hole of a stator assembly fixing block of the shell; the rear bearing is arranged in a rear bearing chamber of the rear cover, and the rear cover is fixed at the rear end of the shell; the front bearing is arranged in a front bearing chamber of the bearing fixing block in front of the fan cover, and the rear end part of the fan cover is fixed at the front end of the shell; the rear end of a rotating shaft of the rotor assembly is inserted into an inner hole of the rear bearing, the front end of the rotating shaft of the rotor assembly penetrates through the inner hole of the front bearing, a permanent magnet component of the rotor assembly is located in an inner cavity of a stator core of the stator assembly, the impeller is fixed to the front end of the rotating shaft and located in a first truncated cone-shaped cavity of the front end portion 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 front end portion of the fan cover, and an air duct gap is formed between the outer end face of each first blade located on the outer surface of the wheel disc of the impeller and the inner surface of the first truncated cone-shaped cavity of the front end portion of the fan cover.
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.
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 outer surface of the rear end of the shell is provided with at least two windows communicated with the inner surface.
The rear cover is also hollow with openings at two ends, the rear bearing chamber is positioned on the rear bearing chamber fixing block, the rear bearing chamber fixing block is fixed on the inner wall of the rear cover through at least two third ribs, and a fourth air duct for air flow circulation is formed between every two adjacent third ribs.
The air duct system component also comprises a fixed impeller, wherein the fixed impeller 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; 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.
Still provide an impeller for on the motor, especially be used for brushless motor, impeller one end opening is the loudspeaker form, including the rim plate that is the loudspeaker form, rim plate bottom and many first blades that link with this rim plate, follow rim plate bottom to the rim plate open end is crescent at radial size and is formed into loudspeaker form, makes the second round platform shape appearance chamber that the rim plate internal surface is loudspeaker form, and many first blades evenly set up on the surface of rim plate with the surface of rim plate forms an organic whole structure, the rim plate bottom is provided with central through-hole.
Compared with the prior art, the brushless motor and the impeller thereof have the advantages that:
firstly, the impeller is set to be in an oblique flow type with a special structure, the structure of the fan cover is correspondingly changed, so that the whole brushless motor is small in size and light in weight, an air duct system of the brushless motor is changed, and an air flow air inlet mode is different from that of a motor in the prior art; by adopting the brushless motor and the structure of the impeller thereof, the highest rotating speed of the motor can 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 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, the brushless motor and the impeller thereof are adopted, so that the channels for air flow circulation are different, and a part of air flow enters the shell from the fourth air channels of the rear cover and then enters the air channel system component through the third air channels 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 conclusion, the brushless motor and the impeller thereof have the advantages of reasonable structure, high rotating speed, large suction force, small volume, light weight, low noise, high efficiency and the like.
[ description of the drawings ]
FIG. 1 is a schematic isometric view of a brushless motor according to the present invention;
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 air duct system components of the brushless motor;
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. 1 to 25, a brushless motor, which can be used for a vacuum cleaner or the like, includes a housing 10 having both ends open and a hollow inside, 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 further comprises an air duct system component 60, wherein the air duct system component 60 comprises a fan cover 61 and an impeller 62, the fan cover and the impeller are hollow, and the two ends of the fan cover are open; the wind shield 61 comprises a rear end portion 611 connected and fixed with the front end of the housing 10 and a hollow and trumpet-shaped front end portion 612 connected with the rear end portion 611, 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, 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 flared with an opening at one end, and includes a flared wheel disc 621, a wheel disc bottom 622 connected to the wheel disc 621, and a plurality of first blades 623, the radial size of the impeller increases gradually from the wheel disc bottom 622 to the opening end of the wheel disc 621 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 first blades 623 of the present invention have nine strips, correspondingly there are nine second air ducts 624, the first air duct 6113 and the first truncated cone-shaped containing cavity 6121 of the fan housing 61, and each first blade 623 and second air duct 624 of the impeller 62 together form an air duct for air flow circulation in the air duct system component 60, the bottom 622 of the wheel disc is provided with a central through hole 6221 matched with the front end of the rotating shaft 31 of the rotor assembly 30; 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. 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.
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 is from the end of the disk bottom 622 of the impeller 62 to the open end of the disk 621 of the impeller 62, and thus, the impeller 62 of the present inventionOne end of each first blade 623 near the wheel disc bottom 622 is an air inlet end, and one end far away from the wheel disc bottom 622, that is, the open end of the wheel disc 621 of the impeller 62 is an air outlet end, so that, it can be said, the height of each first blade 623 gradually decreases from the end near the wheel disc bottom 622 to the direction of the open end of the wheel disc 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 at the air inlet end is relatively 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 blade is thin, the defects of blade deformation, high noise and the like can be caused, and 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, each adjacent surface of the first blade 623 is designed to be arc-shaped, and each adjacent surface of the first blade 623 includes 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 face 6234 of the first blade 623 is a side face of the first blade 623 having an angle smaller than 90 degrees with respect to an outer surface of the disk 621, the second side face 6235 of the first blade 623 is a side face of the first blade 623 having an angle larger than 90 degrees with respect to the outer surface of the disk 621, and the joint of each adjacent surface of the first blade 623 is designed to be arc-shaped, specifically, a joint of the air inlet end face 6231 of the first blade 623 and the second side face 6235 of the first blade 623, a joint of the air outlet end face 6233 of the first blade 623 and the first side face 6234, and a 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 to be arc-shaped The joints of the two parts are designed into arc shapes; 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. 1 to 4, 8 to 12, and 19 to 25, the air duct system member 60 further includes a stationary impeller 63, the stationary impeller 63 including 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 portion 633 is fixed on the inner wall of the inner cylindrical portion 632 by at least two fourth ribs 636; an outer cylindrical portion 631 of the fixed impeller 63 is fixed to the front end portion 612 of the hood 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.
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. 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.
By adopting the brushless motor and the structure of the impeller thereof, the highest rotating speed of the brushless motor can 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 invention brushless motor adopts the diagonal flow impeller, the air duct system component is different, the air current air intake mode is different from the dust collector motor of the prior art, the structure of the brushless motor of the invention can adopt the sectional dust isolation, the dust collector product equipped with the brushless motor of the invention isolates the large particle dust outside the brushless motor of the invention first, charge the tiny particle dust into the inside of the brushless motor of the invention, isolate again in the air outlet end of the brushless motor of the invention, change the air intake system of the brushless motor, promote the work efficiency of the brushless motor, fully utilize the suction of the brushless motor, the brushless motor of the invention has advantages of large suction, small volume, light weight, low noise and high efficiency, etc.
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. A brushless motor comprises a shell (10) with two open ends and a hollow interior, 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) comprises a stator core (21) and stator windings arranged in each stator slot of the stator core (21); the rotor assembly (30) comprises a rotating shaft (31) and a permanent magnet component (32) fixed on the rotating shaft (31); the method is characterized in that:
the fan further comprises an air duct system component (60), wherein the air duct system component (60) comprises a fan cover (61) and an impeller (62), the two ends of the fan cover are open, and the interior of the fan cover is hollow; the wind shield (61) comprises a rear end part (611) fixedly connected with the front end of the shell (10) and a front end part (612) which is connected with the rear end part (611), is hollow inside and is trumpet-shaped, the diameter of a joint part (613) at the joint of the rear end part (611) and the front end part (612) is smaller than the diameter of the opening ends of the rear end part (611) and the front end part (612), the radial size of the joint part (613) towards 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 wind shield (61), the front bearing fixing block (6111) is fixed on the inner wall of the rear end part (611) of the wind shield (61) through at least two first ribs (6112), and a first air duct (6113) for air flow circulation is formed between every two adjacent first ribs (6112), the front bearing fixing block (6111) is provided with a front bearing chamber (61111) capable of accommodating the front bearing (51), and the front end part (612) is provided with a first cone-shaped accommodating cavity (6121) which is matched with the impeller (62) and is trumpet-shaped; 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 (6221) matched with the front end of a rotating shaft (31) of the rotor assembly (30);
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 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 a first central through hole (111) of a stator assembly fixing block (11) of the shell (10); the rear bearing (52) is arranged in a rear bearing chamber (45) of the rear cover (40), and the rear cover (40) is fixed at the rear end of the shell (10); the front bearing (51) is arranged in a front bearing chamber (61111) of a front bearing fixing block (6111) of the fan cover (61), and the rear end part (611) of the fan cover (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 from the inner hole of the rear bearing (52), the front end of the rotating shaft (31) of the rotor component (30) passes through the inner hole of the front bearing (51), the permanent magnet component (32) of the rotor component (30) is positioned in the inner cavity of the stator core (21) of the stator component (20), the impeller (62) is fixed at the front end of the rotating shaft (31) 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 the wheel disc of the impeller (62) is close to the bottom of the first truncated cone-shaped cavity (6121) of the front end (612) of the fan cover (61), and an air duct gap is formed 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 cover (61).
2. The brushless electric machine 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 brushless electric machine 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 brushless electric machine according to 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 brushless electric machine according to 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.
6. The brushless electric machine according to claim 1, wherein:
the outer surface of the rear end of the shell (10) is provided with at least two windows (19) communicated with the inner surface.
7. The brushless electric machine according to claim 1, wherein:
the rear cover (40) is also hollow with openings at two ends, the rear bearing chamber (45) is positioned 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) through at least two third ribs (42), and a fourth air duct (43) for air flow circulation is formed between every two adjacent third ribs (42).
8. The brushless motor according to any one of claims 1 to 7, wherein:
the air duct system component (60) further comprises a fixed impeller (63), wherein 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); an outer cylindrical portion (631) of the fixed impeller (63) is fixed to a front end portion (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).
9. An impeller (62), characterized by:
impeller (62) one end opening is the loudspeaker form, including rim plate (621) that is the loudspeaker form, rim plate bottom (622) and many first blades (623) that link with this rim plate (621), follow rim plate bottom (622) to rim plate (621) open end increases gradually at radial size and forms into the loudspeaker form, makes rim plate (621) internal surface holds chamber (6211) for the second round platform shape of loudspeaker form, and many first blades (623) evenly set up on the surface of rim plate (621) with the surface of rim plate (621) forms an organic whole structure, all forms second wind channel (624) of air current circulation between two adjacent first blades (623), rim plate bottom (622) are provided with central through-hole (6221).
10. The impeller of claim 9, wherein:
the height of each first blade (623) is gradually reduced from the air inlet end to the air outlet end; the thickness of each first blade (623) is gradually increased from the air inlet end to the air outlet end; each first blade (623) is uniformly arranged on the outer surface of the wheel disc (621) in an inclined manner along the rotation direction of the brushless motor; 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.
CN202010430061.7A 2020-05-20 2020-05-20 Brushless motor and impeller thereof Pending CN113708561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010430061.7A CN113708561A (en) 2020-05-20 2020-05-20 Brushless motor and impeller thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010430061.7A CN113708561A (en) 2020-05-20 2020-05-20 Brushless motor and impeller thereof

Publications (1)

Publication Number Publication Date
CN113708561A true CN113708561A (en) 2021-11-26

Family

ID=78645564

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010430061.7A Pending CN113708561A (en) 2020-05-20 2020-05-20 Brushless motor and impeller thereof

Country Status (1)

Country Link
CN (1) CN113708561A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115733327A (en) * 2022-12-21 2023-03-03 湖南国梦科技有限公司 High-rotating-speed brushless dust collector motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115733327A (en) * 2022-12-21 2023-03-03 湖南国梦科技有限公司 High-rotating-speed brushless dust collector motor
CN115733327B (en) * 2022-12-21 2023-09-12 湖南国梦科技有限公司 High-rotation-speed brushless dust collector motor

Similar Documents

Publication Publication Date Title
EP0602007B1 (en) Vacuum cleaner having an impeller and diffuser
CN111441969B (en) Electric fan and electric dust collector with same
JP2008121589A5 (en)
JP2008121589A (en) Electric blower and vacuum cleaner using the electric blower
JP2003009461A (en) Bypass discharge motor assembly, muffler for motor assembly, and cooling fan housing for motor assembly
JP2019002305A (en) Electric blower and vacuum cleaner including the same
EP1618821B1 (en) Centrifugal fan and vacuum cleaner having the centrifugal fan
CN113708561A (en) Brushless motor and impeller thereof
JP4505885B2 (en) Blower, air conditioner using the same, and air purifier
JP7399682B2 (en) Electric blower and vacuum cleaner equipped with it
JPH1199097A (en) Vacuum cleaner
JP6758243B2 (en) Electric blower and vacuum cleaner equipped with it
CN212225567U (en) Air duct system component and fixed impeller thereof
CN212137471U (en) Brushless motor and impeller thereof
JPS5928096A (en) Fan
CN113700660A (en) Air duct system component and fixed impeller thereof
CN110494654B (en) Telecentric fan, molding die and fluid delivery device
JP3123288B2 (en) Electric blower
CN110680241B (en) Electric fan and electric dust collector with same
KR100833379B1 (en) Centrifugal blowing appratus
TW202102779A (en) Fan motor
KR100437035B1 (en) Centrifugal fan of vacuum cleaner
JP7500345B2 (en) Electric blower and vacuum cleaner equipped with same
JPS5893997A (en) Blower
CN219654913U (en) Circular centrifugal axial flow fan

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination