CN111664099A - Special direct current brushless motor of dust catcher - Google Patents

Abstract

A special DC brushless motor for vacuum cleaners, comprising an air guide assembly, a casing, a drive assembly, a control board and a protective cover, the air guide assembly is arranged at one end of the casing, and the drive assembly is arranged in the casing , one end of the drive assembly is connected to the air guide assembly, the protective cover is arranged at the rear end of the casing, the control board is arranged on the inner side of the rear cover and is electrically connected to the drive assembly, The air guide assembly includes: an air guide cover, a moving impeller and a guide impeller, one end of the casing is provided with an inner concave portion that matches the guide impeller, and one side of the guide impeller is inserted into the inner concave portion of the casing , the other side of the guide impeller is mated and plugged with the wind guide cover, and the moving impeller is arranged in the wind guide cover and connected with the output end of the drive assembly. The beneficial effect of the invention is that the stator adopts a spliced structure, which facilitates winding and improves production efficiency, and adopts an asymmetric cone-angle structure, which can ensure assembly accuracy.

Description

A special DC brushless motor for vacuum cleaners

technical field

The invention belongs to the field of motors, and in particular relates to a special DC brushless motor for a vacuum cleaner.

Background technique

The vacuum cleaner uses the motor to drive the fan to rotate at a high speed, so that a partial vacuum is formed in the dust collection room, and the air pressure difference is formed with the dust collection room to generate air flow. The dust is sucked into the dust collection room together with the air flow. . Therefore, the structure of the motor will directly affect the suction force and suction efficiency of the vacuum cleaner, thereby affecting the efficiency value of the vacuum cleaner.

Most of the existing vacuum cleaners are mainly AC motors, which are relatively large in size, heavy in weight, and noisy, and are inconvenient to operate during use.

SUMMARY OF THE INVENTION

In order to effectively solve the above problems, the purpose of the present invention is to provide a DC brushless motor for vacuum cleaners.

The technical scheme of the present invention is as follows:

A special DC brushless motor for vacuum cleaners, comprising an air guide assembly, a casing, a drive assembly, a control board and a protective cover, the air guide assembly is arranged at one end of the casing, and the drive assembly is arranged in the casing , one end of the drive assembly is connected to the air guide assembly, the protective cover is arranged at the rear end of the casing, the control board is arranged on the inner side of the rear cover and is electrically connected to the drive assembly, The air guide assembly includes: an air guide cover, a moving impeller and a guide impeller, one end of the casing is provided with an inner recess that matches the guide impeller, and one side of the guide impeller is inserted into the inner recess of the casing , the other side of the guide impeller is mated and plugged with the wind guide cover, and the moving impeller is arranged in the wind guide cover and connected with the output end of the drive assembly.

Optionally, the guide vane wheel includes: an inner support ring, an outer support ring, and a plurality of first guide vanes arranged between the inner support ring and the outer support ring, and the plurality of first guide vanes have an inner support ring shaft center. It is arranged in a circular array with a center, each of the first guide vanes is arranged obliquely, and the air inlet end and the air outlet end of the first guide vane are respectively provided with a chamfered portion that forms an angle of -degree with the upper surface of the first guide vane. .

Optionally, the plurality of first guide vanes are of an overlapping structure, and the air outlet ends and the air inlet ends of adjacent first guide vanes are located at the same position in the axial direction or have a small gap.

Optionally, the moving impeller includes: a backing plate, an arc top plate and a plurality of blades arranged between the backing plate and the curved top plate, and a main shaft hole is opened in the center of the backing plate for connecting with the output end of the drive assembly. The blades are arranged at the edge of the backing plate in an annular array with the center of the backing plate as the center, and an air inlet is opened in the middle of the arc top plate, and the ratio of the diameter of the air inlet to the outer diameter of the curved top plate is greater than 2:3.

Optionally, the inlet edge of the blade forms an included angle of 7 degrees with the axis of the moving impeller, and the outlet edge of the blade forms an included angle of 7 degrees with the axis of the moving impeller.

Optionally, the edge of the air inlet has a taper, and the taper angle is 25 degrees.

Optionally, the drive assembly includes: a wire frame, a stator, a rotor, a magnetic steel sleeve and a rotor bearing, a stator mounting portion is provided in the casing, a through hole is provided in the center of the stator mounting portion, and the stator is mounted A circle of second guide vanes is arranged between the outer side wall and the inner side of the casing, a plurality of the second guide vanes are arranged in an annular array with the axis of the casing as the center, and each of the second guide vanes is arranged obliquely.

Optionally, the stator is arranged in the stator installation part, the wire frame is connected to the stator, the two rotor bearings are arranged in the through holes of the stator installation part, and the rotor passes through the rotor On the bearing, one end of the rotor is arranged in the center of the stator, and the other end of the rotor as an output end is connected to the center of the backing plate of the moving impeller through the inner support ring of the guide impeller, and the magnetic steel sleeve is sleeved on the rotor at the center. one end of the stator center.

Optionally, the stator is a splicing structure, and the stator is formed by splicing a plurality of stator splicing blocks with the same shape in sequence, coils are wound on the stator splicing blocks, and one end of the stator splicing block is L-shaped asymmetrical. cone angle, the other end of the stator splicing block is a groove adapted to the L-shaped asymmetric cone angle.

Optionally, the end surface of the stator mounting portion is provided with a plurality of first heat dissipation holes, the side wall of the stator mounting portion is provided with a plurality of heat dissipation windows, and the protective cover is provided with a plurality of second heat dissipation holes.

The beneficial effect of the invention is that the stator adopts a spliced structure, which is convenient for winding and improves production efficiency, and the asymmetric cone angle structure is adopted to ensure assembly accuracy, and the chamfered portion of the moving impeller can effectively reduce the eddy current loss of the airflow. The overlapping structure of a guide vane can ensure the smooth passage of airflow without affecting the airflow loss of the incoming impeller, effectively increase the wind pressure, and increase the area of the air inlet, which can effectively increase the air intake area and reduce the wind resistance noise generated by the edge of the impeller when the impeller rotates. The heat dissipation structures such as the first heat dissipation hole, the heat dissipation window, and the second heat dissipation hole can effectively reduce the working temperature of the motor. The special DC brushless motor for the vacuum cleaner of the invention has the advantages of small size, strong suction force, low noise, and is powered by a low-voltage DC power supply, which is convenient to use and has a good cleaning effect.

Description of drawings

Fig. 1 is the split structure schematic diagram of the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of the present invention;

3 is a schematic structural diagram of a first viewing angle of the casing of the present invention;

Fig. 4 is a schematic diagram of the structure of the guide impeller of the present invention;

5 is a schematic structural diagram of the first guide vane of the present invention;

FIG. 6 is an enlarged view of part A in FIG. 5 .

Fig. 7 is the structure schematic diagram of the impeller of the present invention;

FIG. 8 is a schematic cross-sectional structure diagram of the impeller of the present invention along the B-B section;

9 is a schematic diagram of the stator structure of the present invention;

10 is a schematic structural diagram of a second viewing angle of the casing of the present invention;

FIG. 11 is a schematic diagram of the structure of the protective cover of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1-2, a special brushless DC motor for vacuum cleaners includes an air guide assembly 1, a casing 2, a drive assembly 3, a control board 4 and a protective cover 5. The air guide assembly 1 is arranged on the machine One end of the casing 2, the drive assembly 3 is disposed in the casing 2, one end of the drive assembly 3 is connected to the air guide assembly 1, the protective cover 5 is disposed at the rear end of the casing 2, the The control board 4 is arranged on the inner side of the rear cover and is electrically connected with the driving assembly 3 .

As shown in FIGS. 1-3 , the air guide assembly 1 includes: an air guide cover 11 , a moving impeller 12 and a guide impeller 13 , and one end of the casing 2 is provided with an inner recess 2 a for matching the guide impeller 13 . One side of the guide impeller 13 is inserted into the inner recess 2a of the casing 2 , the other side of the guide impeller 13 is mated and inserted with the wind guide cover 11 , and the moving impeller 12 is arranged on the guide hood 11 . The wind hood 11 is connected to the output end of the drive assembly 3 . The air guide hood 11 is connected with the casing 2 through the guide impeller 13, which can reduce the assembly process and ensure the assembly accuracy of the air guide hood 11 and the motor. 2 is engaged, and it can ensure that the first guide vane 133 of the guide vane wheel 13 does not interfere with the inlet of the wind guide hood 11 .

As shown in FIGS. 4-6 , the guide impeller 13 includes: an inner support ring 131, an outer support ring 132, and a plurality of first guide vanes 133 arranged between the inner support ring 131 and the outer support ring 132. The first guide vane 133 is arranged in an annular array with the axis of the inner support ring 131 as the center of the circle, and each of the first guide vanes 133 is arranged obliquely, and the inclination angle of the first guide vane 133 is α. The air inlet end and the air outlet end are respectively provided with a chamfered portion 133a which forms an angle of 5-10 degrees with the upper surface of the first guide vane 133. The chamfered portion 133a can reduce the eddy current loss of the airflow at the fan blade, and significantly improve the The noise generated by eddy current can be reduced by 2-5dB after testing.

As shown in FIG. 4 , a plurality of the first guide vanes 133 are of overlapping structure, and the air outlet end and the air inlet end of the adjacent first guide vanes 133 are located at the same position in the axial direction or have a small gap, so as to ensure smooth airflow. While passing, it does not affect the airflow loss of the incoming impeller, and effectively increases the wind pressure. After testing, the wind pressure of the motor is increased by 8-10%, which avoids the eddy current and turbulent flow affecting the performance of the fan and reduces the damage to the impeller caused by cavitation.

As shown in FIGS. 7-8 , the moving impeller 12 includes: a backing plate 121 , an arc-shaped top plate 122 and a plurality of blades 123 arranged between the backing plate 121 and the curved top plate 122 . The backing plate 121 is provided with a center. The main shaft hole 121a is used to connect with the output end of the drive assembly 3. The blades 123 are arranged in a circular array on the edge of the backing plate 121 with the center of the backing plate 121 as the center. The ratio of the diameter of the air inlet 122a to the outer diameter of the arc top plate 122 is greater than 2:3, compared with the conventional moving impeller 12, the air intake area is increased, the wind resistance noise generated by the edge of the moving impeller 12 during rotation is reduced, and the fan can be improved at the same time. Efficiency, after testing, the air outlet efficiency of the motor is increased by 1-3%.

The inlet edge 123a of the blade 123 forms an included angle of 7 degrees with the axis of the moving impeller, which can reduce the erosion of the blade 123 by the airflow, increase the intake air volume, improve the efficiency, and increase the pressure. The outlet edge 123b of the blade 123 forms an included angle of 7 degrees with the axis of the impeller, which can reduce flow loss, improve efficiency, reduce the volume of the impeller, increase the area of the flow inlet and outlet, and reduce wind noise.

The edge of the air inlet 122a has a taper, and the taper angle is 25 degrees, which reduces the contact area of the air inlet 122a, so that the moving impeller and the air guide cover form a good seal, reduce the flow loss and increase the air pressure.

As shown in FIGS. 1-3 , the drive assembly 3 includes: a wire frame 31 , a stator 32 , a rotor 33 , a magnetic steel sleeve 34 and a rotor bearing 35 , and a stator mounting portion 21 is provided in the casing 2 . A through hole 21 a is provided in the center of the mounting portion 21 , a second guide vane 21 b is arranged between the outer side wall of the stator mounting portion 21 and the inner side surface of the casing 2 , and a plurality of the second guide vanes 21 b are located at the axis of the casing 2 . The second guide vane 21b is arranged in a circular array, and each of the second guide vanes 21b is inclined. The angle of inclination of the second guide vane 21b is β. The first guide vane 133 guides the incoming airflow first, and then the airflow is guided by the second guide vane 21b, which can make the airflow enter more smoothly and effectively reduce wind resistance noise.

As shown in FIGS. 1-3 , the stator 32 is provided in the stator mounting portion 21 , the wire frame 31 is connected to the stator 32 , and the two rotor bearings 35 are provided in the through holes of the stator mounting portion 21 . In 21a, the rotor 33 passes through the rotor bearing 35, one end of the rotor 33 is arranged in the center of the stator 32, and the other end of the rotor 33 serves as an output end through the inner support ring 131 of the guide impeller 13 and The center of the backing plate 121 of the moving impeller 12 is connected, and the magnetic steel sleeve 34 is sleeved on one end of the rotor 33 located at the center of the stator 32 . The two rotor bearings 35 are arranged on the same side of the stator 32, and the double bearings are installed on the same side, which can reduce the number of motor parts and reduce the volume of the motor.

As shown in FIG. 9 , the stator 32 is a splicing structure. The stator 32 is formed by splicing a plurality of stator splicing blocks 321 with the same shape in sequence. The stator splicing blocks 321 are wound with coils. The stator splicing blocks One end of 321 is an L-shaped asymmetric taper angle 321a, the other end of the stator splicing block 321 is a groove adapted to the L-shaped asymmetric taper angle 321a, and the stator splicing block 321 is provided with threaded holes for fixing. The split splicing structure can facilitate winding and improve production efficiency. The L-shaped asymmetric cone angle structure of the stator splicing block 321 can prevent misconnection or reverse connection, and can ensure no deformation and precision requirements during assembly.

The control board 4 is electrically connected to the coils on the stator splicing block 321 .

As shown in FIG. 10 , the end surface of the stator mounting portion 21 is provided with a plurality of first heat dissipation holes 21c, and the side wall of the stator mounting portion 21 is provided with a plurality of heat dissipation windows 21d. The first heat dissipation holes 21c and the heat dissipation holes The window 21d can effectively dissipate the heat generated inside the motor during operation, thereby improving the efficiency of the motor.

As shown in FIG. 11 , the protective cover 5 is provided with a plurality of second heat dissipation holes 51 to ensure better heat dissipation of the control board 4 when the motor is working.

After testing, when the first heat dissipation hole 21c, the heat dissipation window 21d and the second heat dissipation hole 51 are not provided, the working temperature of the motor is about 42 degrees. After the first heat dissipation hole 21c, the heat dissipation window 21d and the second heat dissipation hole 51 are opened, the motor works. The temperature is maintained at about 38 degrees, and the heat dissipation effect is obvious.

The beneficial effect of the invention is that the stator adopts a spliced structure, which is convenient for winding and improves production efficiency, and the asymmetric cone angle structure is adopted to ensure assembly accuracy, and the chamfered portion of the moving impeller can effectively reduce the eddy current loss of the airflow. The overlapping structure of a guide vane can ensure the smooth passage of airflow without affecting the airflow loss of the incoming impeller, effectively increase the wind pressure, and increase the area of the air inlet, which can effectively increase the air intake area and reduce the wind resistance noise generated by the edge of the impeller when the impeller rotates. The heat dissipation structures such as the first heat dissipation hole, the heat dissipation window, and the second heat dissipation hole can effectively reduce the working temperature of the motor.

Claims (10)

1. A dedicated DC brushless motor for a vacuum cleaner, comprising an air guide assembly (1), a casing (2), a drive assembly (3), a control board (4) and a protective cover (5), the air guide assembly (1) ) is arranged at one end of the casing (2), the driving component (3) is arranged in the casing (2), and one end of the driving component (3) is connected with the air guide component (1), so The protective cover (5) is arranged on the rear end of the casing (2), and the control board (4) is arranged on the inner side of the rear cover and is electrically connected to the drive assembly (3), characterized in that , the air guide assembly (1) comprises: an air guide cover (11), a moving impeller (12) and a guide impeller (13), and one end of the casing (2) is provided with an inner part that matches the guide impeller (13). A recess (2a), one side of the guide impeller (13) is inserted into the inner recess (2a) of the casing (2), and the other side of the guide impeller (13) is connected to the air guide cover (11) Matching and plugging, the moving impeller (12) is arranged in the air guide cover (11) and is connected to the output end of the driving assembly (3). 2 . The brushless DC motor for vacuum cleaners according to claim 1 , wherein the guide impeller ( 13 ) comprises: an inner support ring ( 131 ), an outer support ring ( 132 ) and a plurality of inner support rings. (131), a first guide vane (133) between the outer support ring (132), a plurality of the first guide vanes (133) are arranged in an annular array with the axis of the inner support ring (131) as the center of the circle, each of the The first guide vane (133) is arranged obliquely, and the air inlet end and the air outlet end of the first guide vane (133) are respectively provided with clips at (5)-(10) degrees to the upper surface of the first guide vane (133) Corner chamfer (133a). 3 . The brushless DC motor for vacuum cleaners according to claim 2 , wherein the plurality of first guide vanes ( 133 ) are of an overlapping structure, and the air outlet ends of adjacent first guide vanes ( 133 ) are connected to the inlet and outlet ends of the adjacent first guide vanes ( 133 ). The wind end is in the same position in the axial direction or has a small gap. 4. The brushless DC motor for vacuum cleaners according to claim 1, wherein the moving impeller (12) comprises: a backing plate (121), an arc-shaped top plate (122) and a plurality of ) and the arc top plate (122) between the blade (123), the center of the backing plate (121) is provided with a main shaft hole (121a) for connecting with the output end of the drive assembly (3), the blade (123) An annular array is arranged at the edge of the backing plate (121) with the center of the backing plate (121) as the center, and an air inlet (122a) is opened in the middle of the arc-shaped top plate (122). The ratio of the outer diameter of the top plate (122) is greater than 2:3. 5. The brushless DC motor for vacuum cleaners according to claim 4, wherein the inlet edge (123a) of the blade (123) forms an included angle of 7 degrees with the axis of the moving impeller, and the blade (123) has an angle of 7 degrees. The outlet edge (123b) forms an included angle of 7 degrees with the axis of the impeller. 6 . The brushless DC motor for vacuum cleaners according to claim 4 , wherein the edge of the air inlet ( 122 a ) has a taper, and the taper angle is 25 degrees. 7 . 7. The DC brushless motor for vacuum cleaners according to claim 1, wherein the drive assembly (3) comprises: a wire frame (31), a stator (32), a rotor (33), a magnetic steel sleeve (34) ) and a rotor bearing (35), a stator mounting portion (21) is provided in the casing (2), a through hole (21a) is provided in the center of the stator mounting portion (21), and the stator mounting portion (21) A circle of second guide vanes (21b) is arranged between the outer side wall and the inner side surface of the casing (2), and a plurality of the second guide vanes (21b) are arranged in an annular array with the axis of the casing (2) as the center, each The second guide vanes (21b) are arranged obliquely. 8 . The brushless DC motor for vacuum cleaners according to claim 7 , wherein the stator ( 32 ) is arranged in the stator mounting portion ( 21 ), and the wire rack ( 31 ) is connected to the stator ( 8 . 32) connection, the two rotor bearings (35) are arranged in the through hole (21a) of the stator mounting part (21), the rotor (33) is penetrated on the rotor bearing (35), the rotor (33) One end is arranged in the center of the stator (32), and the other end of the rotor (33) is used as an output end to pass through the inner support ring (131) of the guide impeller (13) and the backing plate (121) of the moving impeller (12). ) center connection, the magnetic steel sleeve (34) is sleeved on one end of the rotor (33) located at the center of the stator (32). 9 . The brushless DC motor for vacuum cleaners according to claim 7 , wherein the stator ( 32 ) is a splicing structure, and the stator ( 32 ) is composed of a plurality of stator splicing blocks ( 321 ) with the same shape in sequence. 10 . A coil is wound on the stator splicing block (321), one end of the stator splicing block (321) is an L-shaped asymmetric taper angle (321a), and the other end of the stator splicing block (321) is adapted The groove of the L-shaped asymmetric taper angle (321a). 10 . The brushless DC motor for vacuum cleaners according to claim 7 , wherein a plurality of first heat dissipation holes ( 21 c ) are opened on the end surface of the stator mounting portion ( 21 ), and the stator mounting portion ( 21 ) A plurality of heat dissipation windows (21d) are opened on the side wall of the protective cover (5), and a plurality of second heat dissipation holes (51) are opened on the protective cover (5).

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