CN212225567U - Air duct system components and their fixed impellers - Google Patents

Abstract

The utility model relates to an air duct system component and a fixed impeller thereof. The air duct system component includes a wind cover, an impeller and a fixed impeller; the wind cover includes a rear end and a front end; a blade, each first blade is evenly arranged on the outer surface of the wheel disc; the fixed impeller includes an outer cylindrical part, an inner cylindrical part and a central cylindrical part; the inner cylindrical part is fixed on the inner wall of the outer cylindrical part by a plurality of second blades; the center The cylindrical part is fixed on the inner wall of the inner cylindrical part by at least two fourth ribs; the front end of the impeller is fixed on the rotating shaft of the brushless motor, and the front end is located in the first circular conical cavity of the wind cover, and the bottom of the wheel disc of the impeller is close to the No. 1 of the wind cover. At the bottom of a circular truncated cavity, the outer end surface of each first blade of the impeller and the inner surface of the first circular truncated cavity of the windshield form an air duct gap; the outer cylindrical part of the fixed impeller is fixed on the front end of the windshield. The air duct system components of the utility model have the advantages of reasonable structure, small volume and light weight.

Description

Air duct system components and their fixed impellers

【Technical field】

The utility model relates to a small or micro motor, in particular to a small or micro brushless motor, such as a brushless motor used on a vacuum cleaner, in particular to an air duct system component used on the brushless motor.

【Background technique】

A brushless motor in the prior art, such as a brushless motor used on a vacuum cleaner, is directly called a vacuum cleaner motor, and has the following shortcomings:

1. Due to the limitation of the air duct system structure of the motor of the vacuum cleaner in the prior art, the air intake mode of the vacuum cleaner in the prior art is to completely isolate the dust at the outer end of the air inlet of the motor, and the air inlet must be isolated by a very dense filter screen and filter element. Dust, the airflow is hindered and increased, and the suction of the motor will also be reduced;

2. The vacuum cleaner motor in the prior art adopts a centrifugal impeller. The centrifugal impeller has a large volume, and each first blade on the impeller is a riveted structure, so that the entire impeller is not strong enough. The maximum speed is usually only between 60,000 and 80,000 rpm (revolutions per minute) at most, and the high-efficiency range of work is relatively narrow, and the work performance is greatly limited. There are generally small suction, large volume, heavy weight, high noise and low efficiency. not enough to wait;

3. The matching gap between the impeller and other components of the vacuum cleaner motor in the prior art is large, and the air flow in the gap collides with each other, which will generate noise, so that the airflow loss is large, so that the entire motor cannot achieve better efficiency, and when the airflow exceeds When the high-speed flow out of the root of the impeller, the airflow will run around and turbulent flow will occur. These turbulent flows collide with the surrounding materials, which will produce abnormal noise and affect the normal operation of the airflow.

Therefore, it is very necessary to redesign an air duct system structure suitable for brushless motors.

【Content of utility model】

The technical problem to be solved by the present invention is to avoid the above-mentioned shortcomings of the prior art and provide an air duct system component and its fixed impeller, which have the advantages of reasonable structure, small size and light weight. The air duct system component is used for On the brushless motor, the brushless motor has the advantages of high speed, high suction, low noise and high efficiency.

The technical scheme adopted by the present utility model to solve the technical problem is:

An air duct system component is provided for use on a brushless motor, which can be used on products such as vacuum cleaners. The wind hood includes a rear end portion that is fixedly connected with the front end of the housing of the brushless motor, and a front end portion that is connected to the rear end portion and has a hollow interior and a trumpet shape, and the joint portion where the rear end portion and the front end portion connect The diameter is smaller than the diameter of the open ends of the rear end and the front end, and the radial dimension gradually increases from the joint portion to the open end of the front end so that the front end portion is formed into a trumpet shape, and the The rear end of the wind hood is provided with a front bearing fixing block, the front bearing fixing block is fixed on the inner wall of the rear end of the wind hood through at least two first ribs, and the space between the two adjacent first ribs is A first air duct for air flow is formed. The front bearing fixing block is provided with a front bearing chamber that can accommodate the front bearing of the brushless motor. One end of the impeller is open and is trumpet-shaped, including a trumpet-shaped wheel, a wheel bottom connected with the wheel, and a plurality of first blades, from the bottom of the wheel to the open end of the wheel. The radial dimension is gradually increased to form a trumpet shape, so that the inner surface of the wheel disc is a trumpet-shaped second circular cone-shaped cavity, and a plurality of first blades are evenly arranged on the outer surface of the wheel disc and the wheel. The outer surface of the disc forms an integral structure, and a second air channel for airflow is formed between the two adjacent first blades. The bottom of the disc is provided with a central through hole that matches the front end of the rotating shaft of the rotor assembly of the brushless motor. The fixed impeller comprises an outer cylindrical part with two ends open and hollow inside, an inner cylindrical part and a central cylindrical part with both ends open; the inner cylindrical part is fixed on the inner wall of the outer cylindrical part through a plurality of second blades, A fifth air channel for air flow is formed between 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 on the brushless motor. The front end of the rotating shaft is located in the first circular conical cavity at the front end of the windshield, the bottom of the wheel disc of the impeller is close to the bottom of the first circular conical cavity at the front end of the windshield, and is located in the wheel of the impeller The outer end surface of each first blade on the outer surface of the disc and the inner surface of the first circular truncated cavity at the front end of the wind cover form an air duct gap; the outer cylindrical part of the fixed impeller is fixed on the front end of the wind cover ; The first air duct and the first circular frustum-shaped cavity of the hood, the first blades and the second air duct of the impeller, and the fifth air duct of the fixed impeller together constitute the airflow in the air duct system The air duct that circulates in the component.

The height of each first blade gradually decreases 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.

The first blades are evenly arranged on the outer surface of the wheel disc in an inclined manner along the rotation direction of the brushless motor.

Along the rotation direction of the brushless motor, when each first blade is evenly arranged on the outer surface of the wheel disc in an inclined manner, the inclination angle of the first blade increases first and then decreases from the tuyere end.

Both sides of each first blade in contact with the outer surface of the wheel disc are arc-shaped contact surfaces.

The connecting portion of each adjacent surface of the first blade is designed in an arc shape.

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

Also provided is a fixed impeller, which is used on a motor, especially a brushless motor, comprising an outer cylindrical part with two openings and a hollow inside, an inner cylindrical part and a central cylindrical part with two openings; the inner cylindrical part A plurality of second blades are fixed on the inner wall of the outer cylindrical portion, and a fifth air channel for air flow is formed between two adjacent second blades; the central cylindrical portion is fixed on the inner wall of the outer cylindrical portion by at least two fourth ribs on the inner wall of the inner cylindrical portion.

Compared with the prior art, the beneficial effects of the air duct system component of the present utility model and the fixed impeller thereof are:

1. In the present invention, the impeller of the air duct system component is set to a special structure of oblique flow, and the structure of the air hood is also changed accordingly, so that the entire air duct system component is small in size and light in weight, so that the air flow of the brushless motor is reduced. The duct system has been changed, and the air intake mode is different from the air duct system of the motor in the prior art, so that the structure of the brushless motor can be segmented to isolate dust, and the vacuum cleaner equipped with the brushless motor of the air duct system component of the present invention The product first isolates large particles of dust outside the brushless motor, allows fine particles of dust to enter the brushless motor, and isolates it again at the air outlet end of the brushless motor, which changes the air intake system of the brushless motor and improves the brushless motor. The working efficiency is improved, and the suction force of the brushless motor is fully utilized; by adopting the structure of the air duct system components and the fixed impeller of the utility model, the maximum speed of the motor can reach 110,000 rpm to 130,000 rpm, which is higher than that of the prior art vacuum cleaner. The maximum speed of the motor from 60,000 rpm to 80,000 rpm is much higher;

2. The impeller of the present invention also improves the air separation state in the air inlet area of the impeller by improving the evenly inclined distribution of the first blades on the outer surface of the disc, and then adjusting the thickness and height distribution of the first blades. Reduced airflow loss and reduced noise;

3. In the utility model, a fixed impeller is placed on the impeller and the wind cover at the position of the air outlet, and a plurality of second blades are designed in the fixed impeller. The air flow is guided on the outer surface and the inner wall of the outer cylindrical portion, which alleviates a series of defects caused by the collision of the air flow with each other;

4. By adopting the structure of the air duct system components of the present invention, the air flow passages of the brushless motor are also different, and a part of the air flow enters the casing of the brushless motor from the fourth air ducts of the rear cover of the brushless motor, and then passes through the brushless motor. Each third air duct in the outer casing enters into the air duct system component; another part of the air flow enters the outer casing from each window of the outer casing, and then enters the air duct system component after passing through each third air duct in the outer casing; enters the air duct The airflow in the system components flows into the second air duct of the impeller through the first air duct and the first circular conical cavity of the hood, and then flows out from the fifth air duct of the fixed impeller.

To sum up, the air duct system component and its fixed impeller of the present invention have the advantages of reasonable structure, small size and light weight. , low noise and high efficiency.

【Description of drawings】

Fig. 1 is the axonometric projection schematic diagram after the air duct system component of the present utility model is used on the brushless motor;

Figure 2 is a schematic axonometric projection of the brushless motor in another direction;

Fig. 3 is the front projection front sectional schematic diagram of described brushless motor, each dashed line in this figure represents the route of airflow, wherein the arrow on the dashed line represents the direction of airflow;

Fig. 4 is the axonometric projection schematic diagram after the described brushless motor is decomposed;

5 is a schematic axonometric projection of the casing of the brushless motor;

Fig. 6 is the front projection front sectional schematic diagram of described casing;

7 is a schematic axonometric projection of the stator core of the brushless motor;

Fig. 8 is the axonometric projection schematic diagram of the air duct system component of the present invention;

FIG. 9 is a schematic axonometric projection of the air duct system components in another direction

Fig. 10 is the front projection front sectional schematic diagram of described air duct system component, each dashed line in this figure represents the route of airflow, wherein the arrow on the dashed line represents the direction of airflow;

Fig. 11 is the axonometric projection schematic diagram after the components of the air duct system are decomposed;

Figure 12 is one of the schematic axonometric projections of the impeller of the air duct system component;

Figure 13 is the second schematic diagram of the axonometric projection of the impeller;

Figure 14 is the third schematic diagram of the axonometric projection of the impeller;

15 is a schematic top view of the orthographic projection of the impeller;

Fig. 16 is the orthographic front view schematic diagram of described impeller;

17 is a schematic diagram of an orthographic rear view of the impeller;

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

19 is a schematic axonometric projection of the fixed impeller of the air duct system component;

Figure 20 is a schematic axonometric projection of the fixed impeller in another direction;

Fig. 21 is the orthographic front view schematic diagram of described fixed impeller;

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

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

Figure 24 is a schematic axonometric projection of the hood of the air duct system component;

FIG. 25 is a schematic axonometric projection of the wind hood in another direction.

【Detailed ways】

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

3, 8 to 25, an air duct system component 60 is used on a brushless motor; the air duct system component 60 includes a hollow hood 61, an impeller 62 and a fixed impeller 63 with openings at both ends; The windshield 61 includes a rear end portion 611 that is fixedly connected to the front end of the housing 10 of the brushless motor, and a front end portion 612 that is connected to the rear end portion 611 and is hollow and trumpet-shaped. The rear end portion 611 and the front end The diameter of the joint part 613 where the parts 612 are connected is smaller than the diameter of the open ends of the rear end part 611 and the front end part 612, and the radial dimension gradually increases from the joint part 613 to the open end of the front end part 612. The front end portion 612 is formed into a trumpet shape, and the rear end portion 611 of the wind cover 61 is provided with a front bearing fixing block 6111, and the front bearing fixing block 6111 is fixed on the On the inner wall of the rear end 611 of the wind cover 61, a first air duct 6113 for air flow is formed between two adjacent first ribs 6112. There are four first ribs 6112 in the present invention. There are four places in the channel 6113. The front bearing fixing block 6111 is provided with a front bearing chamber 61111 that can accommodate the front bearing 51 of the brushless motor. A cavity 6121; the impeller 62 is open at one end and is trumpet-shaped, including a trumpet-shaped disc 621, a disc bottom 622 connected with the disc 621, and a plurality of first blades 623. The radial dimension of 622 gradually increases toward the open 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 circular conical cavity 6211, and a plurality of first blades 623 are evenly arranged An integral structure is formed on the outer surface of the wheel disc 621 and the outer surface of the wheel disc 621 , and a second air channel 624 for air flow is formed between two adjacent first blades 623 . There are nine blades 623, and correspondingly there are nine second air ducts 624. The bottom 622 of the wheel disc is provided with a central through hole 6221 that matches the front end of the rotating shaft 31 of the rotor assembly 30 of the brushless motor; the fixed impeller 63 It includes an outer cylindrical portion 631 that is open at both ends and has a hollow interior, an inner cylindrical portion 632 that is open at both ends and has a hollow interior, 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 evenly 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 airflow is formed between adjacent two second blades 634 , there are ten second blades 634 in the present invention, and correspondingly there are ten fifth air ducts 635; the central cylindrical portion 633 is fixed on the inner wall of the inner cylindrical portion 632 through at least two fourth ribs 636. The fourth rib 636 of the utility model has four pieces; the central through hole 6221 of the bottom 622 of the wheel disc of the impeller 62 is sleeved and fixed on the brushless motor. The front end of the rotating shaft 31 of the machine, so that the impeller 62 is fixed at the front end of the rotating shaft 31 of the brushless motor and is located in the first circular frustum-shaped cavity 6121 of the front end 612 of the wind cover 61. The bottom of the wheel disc of the impeller 62 622 is close to the bottom of the first circular truncated cavity 6121 of the front end 612 of the windshield 61 , and the outer end surfaces of the first blades 623 on the outer surface of the disk 621 of the impeller 62 and the front end of the windshield 61 The inner surface of the first circular truncated cavity 6121 of 612 forms an air duct gap; the outer cylindrical portion 631 of the fixed impeller 63 is fixed on the front end portion 612 of the wind cover 61; the first air duct 6113 of the wind cover 61 and The first circular truncated cavity 6121 together with each of the first blades 623 and the second air passages 624 of the impeller 62 and the fifth air passage 635 of the fixed impeller 63 constitutes a space for the airflow to circulate in the air passage system component 60 . air duct. The trumpet-shaped structure described in the present invention can also be described as a truncated truncated structure, and the truncated truncated structure is hollow inside and has a certain wall thickness.

In the prior art brushless motor, when the airflow flows out of the root of the impeller at an ultra-high speed, the airflow will run around, causing turbulent flow, and these turbulent flows collide with surrounding materials, which will produce abnormal noise, which affects the normal operation of the airflow and other problems; 1 to 4, 8 to 12 and 19 to 25, in order to overcome this defect, after many designs and tests, a fixed set is specially placed on the impeller 62 and the hood 61 at the air outlet position. The impeller 63, a plurality of second blades 634 are designed in the fixed impeller 63, and the second blades 634 are designed in an arc shape and are evenly inclined on the outer surface of the inner cylindrical part 632 of the fixed impeller 63 and the inner wall of the outer cylindrical part 631, and the airflow is carried out. A series of defects caused by guidance, slowing down the collision of airflows, etc.

Referring to FIGS. 1 to 25 , the components of the air duct system of the present invention are used on a brushless motor. The brushless motor includes a hollow casing 10 with openings at both ends, a stator assembly 20, a rotor assembly 30, and a rear bearing chamber 45. The rear cover 40, the front bearing 51 and the rear bearing 52; the stator assembly 20 includes a stator core 21 and stator windings (not shown) arranged in the stator slots 211 of the stator core 21. For example, the applicant has a The brushless motor adopts a stator core 21 with three 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 includes a fan using the utility model The track system component 60; the casing 10 is provided with a stator assembly fixing block 11, the stator assembly fixing block 11 is fixed on the inner wall of the casing 10 by at least two second ribs 12, adjacent to two second ribs The third air ducts 13 for air flow are formed between the bars 12. The second rib 12 of the present invention has four pieces, and correspondingly there are four third air ducts 13. The length of the stator assembly fixing block 11 is less than the length of the casing 10, the stator assembly fixing block 11 is provided with a first central through hole 111 capable of fixing the stator assembly 20; a central through hole 111 ; the rear bearing 52 is arranged in the rear bearing chamber 45 of the rear cover 40 , and the rear cover 40 is fixed at the rear end of the housing 10 ; the front bearing 51 is arranged in front of the wind hood 61 . Inside the front bearing chamber 61111, the rear end 611 of the wind cover 61 is fixed to the front end of the housing 10; the rear end of the shaft 31 of the rotor assembly 30 is inserted from the inner hole of the rear bearing 52, and the 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 part 32 of the rotor assembly 30 is located in the inner cavity of the stator iron core 21 of the stator assembly 20 , and the inner cavity of the impeller 62 . The central through hole 6221 of the bottom 622 of the wheel disc is sleeved and fixed 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 is located in the first circular frustum-shaped cavity 6121 of the front end 612 of the wind cover 61 Inside, the disc bottom 622 of the impeller 62 is close to the bottom of the first circular frustum-shaped cavity 6121 of the front end 612 of the hood 61 , and is located outside each first blade 623 on the outer surface of the disc 621 of the impeller 62 . An air duct gap is formed between the end surface and the inner surface of the first circular frustum-shaped cavity 6121 of the front end 612 of the air cover 61 .

Referring to FIGS. 12 to 18 , in order to facilitate smooth airflow and easy entry of airflow, 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 airflow flows from the end of the bottom 622 of the impeller 62 to the open end of the disk 621 of the impeller 62 . Therefore, the first blades of the impeller 62 of the present invention are The end of 623 close to the bottom 622 of the wheel disc is the air inlet end, and the end far from the bottom 622 of the wheel disc, that is, the open end of the wheel disc 621 of the impeller 62 is the air outlet end. The height of a blade 623 gradually decreases from the end close to the bottom 622 _of the wheel disc to the direction of the open end of the wheel disc 621; The height H ₂ of the first blade 623 at the air outlet end is the smallest. For example, the applicant has an impeller 62, and the height H1 of each first blade 623 at the air inlet end is 5.0 mm, while the height _H2 of each _first blade 623 at the air outlet end is only 3.5 mm. In this way, when entering The airflow tends to gather together, and when it comes out, the airflow tends to spread.

12 to FIG. 18 , the thickness of each first blade 623 gradually increases from the air inlet end to the air outlet end. It can also be said that the thickness of each first blade 623 increases from the end close to the bottom 622 of the wheel disc toward the end. The direction of the opening end of the disc 621 gradually increases; specifically, the thickness T1 of each first blade 623 at the air inlet end is the smallest, and the thickness T2 of each _first blade ₆₂₃ at the air outlet end is the largest. For example, the applicant has an impeller 62, the thickness T1 of each first blade 623 at the air inlet end is only 0.1 mm, while the thickness T2 of each _first blade ₆₂₃ at the air outlet end reaches 0.9 mm. The thickness of each first blade 623 at the air inlet end is relatively thin, which makes it easy for the airflow to enter, but because the airflow collides with each other when the airflow circulates when the motor rotates at a high speed, if the blade is thin, there will be problems such as blade deformation and relatively high noise. Therefore, in the present invention, the thickness of each first blade 623 is gradually increased from the air inlet end to the air outlet end, which not only makes the airflow easy to enter, but also increases the strength of each first blade 623. Noise will be reduced.

12 to 18 , the first blades 623 are evenly arranged on the outer surface of the wheel disc 621 in an oblique manner along the rotation direction of the brushless motor; along the rotation direction of the brushless motor, the first blades When the 623 is evenly arranged on the outer surface of the wheel disc 621 in an inclined manner, its inclination angle increases first and then decreases from the tuyere end, so that when the brushless motor rotates at a high speed, the airflow is easily sucked in, which can effectively Reduce fluid loss at the inlet end.

Referring to FIGS. 12 to 17 , the connecting parts of the adjacent surfaces of the first blades 623 are designed in an arc shape; 6232, the air outlet end face 6233 of the first blade 623, the first side 6234 of the first blade 623, and the second side 6235 of the first blade 623, wherein the first side 6234 of the first blade 623 is the first blade 623 and the wheel disc. The side with the angle between the outer surfaces of the 621 is less than 90 degrees, and the second side 6235 of the first blade 623 is the side with an angle greater than 90 degrees between the first blade 623 and the outer surface of the wheel 621, the first blade 623 The connection part of each adjacent surface is designed in an arc shape, specifically, the connection between the air inlet end face 6231 of the first blade 623 and the second side surface 6235 of the first blade 623, the air outlet end face 6233 of the first blade 623 and the second side surface 6235 of the first blade 623. The connection between the first side surface 6234 of a blade 623 and the connection between the air outlet end surface 6233 of the first blade 623 and the second side surface 6235 of the first blade 623 are all designed to be arc-shaped; and the air inlet end surface 6231 of the first blade 623 The connection point with the upper end surface 6232 of the first blade 623, the connection point between the air inlet end surface 6231 of the first blade 623 and the first side surface 6234 of the first blade 623, the connection point between the upper end surface 6232 of the first blade 623 and the first blade 623 The connection between the first side surface 6234, the connection between the upper end surface 6232 of the first blade 623 and the second side surface 6235 of the first blade 623, the connection between the upper end surface 6232 of the first blade 623 and the outlet end surface 6233 of the first blade 623 It is not designed to be arc-shaped to directly form a straight edge; the advantage of this is that when the airflow passes through the interior of the second air duct 624 between the first blades 623, it will be discharged very smoothly, avoiding the high-speed rotation of the impeller 62. Each first vane 623 blocks the airflow back.

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

Referring to Figure 1, Figure 2, Figure 4 and Figure 5, the outer surface of the rear end of the casing 10 is provided with at least two windows 19 that communicate with the inner surface. Four windows 19 connected on the surface.

1 and 4 , the rear cover 40 is also hollow at both ends, and the rear bearing chamber 45 is located on the rear bearing chamber fixing block 41, and the rear bearing chamber fixing block 41 is fixed on the rear bearing chamber through at least two third ribs 42. On the inner wall of the rear cover 40, a fourth air duct 43 for air flow is formed between two adjacent third ribs 42; there are four third ribs 42 in the present invention, corresponding to the fourth air duct 43 has four.

3 and 10 , each dashed line in the figure represents the route of airflow, and the arrows on the dashed line represent the direction of airflow; a part of the airflow enters the housing 10 from the fourth air ducts 43 of the rear cover 40, and then After passing through the third air ducts 13 in the housing 10, it enters the air duct system component 60; another part of the airflow enters the housing 10 from the windows 19 of the housing 10, and then passes through the third air ducts 13 in the housing 10. Then enter into the air duct system component 60 . The air entering the air duct system component 60 flows into the second air duct 624 of the impeller 62 through the first air duct 6113 and the first circular conical cavity 6121 of the hood 61, and then the air flows from the fixed air duct 624. The fifth air passage 635 of the impeller 63 flows out.

5 and 6, in fact, the housing 10, the stator assembly fixing block 11 and the rib 12 are the same part, of course, they can also be assembled from different parts.

3 and 10, the rear cover 40 and its rear bearing chamber 45, the housing 10 and the first central through hole 111 of the stator assembly fixing block 11, the rear end 611 of the wind cover 61 and its front bearing The front bearing chamber 61111 of the fixed block 6111, the front end 612 of the windshield 61 and the impeller 62 have a common central axis.

1 to 6, the rear end face of the rear cover 40 is also symmetrically provided with three axial protruding columns 44, which are mainly used for fixing the control board 99, so that the control board 99 has a certain distance, so that the To allow airflow to enter from each of the fourth air ducts 43 of the rear cover 40, the control panel 99 is not shown in FIGS. 1 to 3 . Referring to FIGS. 1 to 6 , the rear port of the housing 10 is provided with a rear end inner stop 14 that matches the outer stop 49 of the rear cover 40 , and the front port of the housing 10 is provided with a rear end 611 of the hood 61 . The outer stop 6119 is adapted to the inner stop 15 at the front end; the first central through hole 111 of the stator assembly fixing block 11 of the housing 10 is divided into two stepped holes, wherein the first stepped hole 1111 is used to fix the stator assembly 20 The second stepped hole 1112 is used to accommodate the end of the front wire frame (not shown) of the stator assembly 20. The inner diameter of the first stepped hole 1111 is slightly larger than that of the second stepped hole 1112.

Referring to Figure 3, Figure 10 to Figure 14 and Figure 18, in order to ensure the matching length of the impeller 62 and the rotating shaft 31, so that the impeller 62 is fixed more firmly and runs more smoothly, the bottom 622 of the wheel disc of the impeller 62 is provided with a central cylinder with a certain length. 6229, the central through hole 6221 of the wheel disc bottom 622 runs through the central cylinder 6229, in order to save the axial dimension, the central cylinder 6229 protrudes on both axial sides of the wheel disc bottom 622; in order to make the impeller 62 more firm, the wheel disc The bottom portion 622 protrudes outwards by a disk bottom convex ring 6228, and in order to save weight, a cavity 6227 is formed between the disk bottom convex ring 6228 and the central cylinder 6229. The impeller 62 of the present invention can be called a diagonal flow impeller, which is a great improvement over the centrifugal fan blades of the prior art. The parts of the impeller 62 are integrally formed, and the material can be made of aluminum alloy or other materials such as a It is made of high-strength engineering plastics. The applicant has an impeller 62 made of aluminum alloy, because the aluminum alloy material is relatively light and has high strength. In addition, the special structure of the impeller 62 of the present invention makes the The impeller 62 of the present utility model can maintain sufficient strength to withstand the relevant force when the motor rotates at high speed, and the overall structure of the impeller 62 of the present utility model is very firm; and the impeller 62 of the present utility model improves the uniformity of the outer surface of each first blade 623 on the outer surface of the wheel disc 621 The inclined distribution state, and then adjust the thickness and height distribution of each first blade 623, thereby improving the airflow separation state of the air inlet area of the impeller 62, reducing airflow loss and reducing noise. By adopting the impeller 62 with the special structure of the present invention, the outer end surfaces of the first blades 623 on the outer surface of the disk 621 of the impeller 62 can be connected to the inner surface of the first circular frustum-shaped cavity 6121 of the front end 612 of the wind cover 61 . The gap between the air ducts is 0.1-0.3 mm, so that the impeller 62 and the air hood 61 can achieve a high-precision fit. For high-speed motors, it can effectively reduce the airflow loss and improve the noise problem. However, the air duct gap between the impeller and the hood in the prior art is relatively large, generally the minimum can only reach 0.6-0.8 mm, the air duct gap is large, and the airflow collides with each other, which will generate noise, so that the airflow loss is very large, and the motor product better efficiency cannot be achieved.

The brushless motor adopting the air duct system components and the fixed impeller structure of the utility model can make the maximum speed of the brushless motor reach 110,000 rpm to 130,000 rpm, which is higher than the 60,000 rpm of the prior art vacuum cleaner motor. The maximum rotational speed of 80,000 rpm to 80,000 rpm is much higher; the components of the air duct system of the present utility model use oblique flow impellers. The brushless motor of the system component can use segmented dust isolation. The vacuum cleaner product first isolates large particles of dust outside the brushless motor, allowing fine particles of dust to enter the brushless motor, and isolate it again at the air outlet end of the brushless motor. , the air intake system of the brushless motor is changed, the working efficiency of the brushless motor is improved, and the suction force of the brushless motor is fully utilized, so that the brushless motor using the air duct system components of the utility model has the advantages of large suction force, small size and light weight , low noise and high efficiency.

The above-mentioned embodiment only expresses the preferred embodiment of the present invention, and its description is more specific and detailed, but it should not be construed as a limitation to the scope of the present invention; it should be pointed out that for those of ordinary skill in the art For example, without departing from the concept of the present utility model, some deformations and improvements can also be made, and these all belong to the protection scope of the present utility model; , all should belong to the scope of 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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