Vacuum cleaner motor components

Abstract

Vacuum cleaner motor assembly. The present invention discloses a motor assembly comprising an outer cover with open front and rear ends, a fixed impeller and an outer shell with open front and rear ends arranged in sequence, a movable impeller located in front of the fixed impeller is arranged in the outer cover, a motor located behind the fixed impeller and connected to the movable impeller is arranged in the outer shell, the movable impeller is provided with a plurality of first flow channels along its circumference, the fixed impeller is provided with a plurality of second flow channels connected to the first flow channels along its circumference, the motor has a casing, an air duct connected to the second flow channel is formed between the outer surface of the casing and the inner wall of the casing, and a plurality of first through holes are provided on the outer surface of the casing. This embodiment omits the fan in the prior art, improves the heat dissipation effect, simplifies the structure, improves the motor efficiency, increases the motor speed and service life, is easy to assemble and manufacture, can reduce the manufacturing cost, and omits the fan to reduce the axial size of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum cleaners, and in particular to a vacuum cleaner motor assembly. Background Art

[0002] The DC brush motor in the existing vacuum cleaner usually uses a fan for heat dissipation. The speed of this DC brush motor is not high, but it must be cooled by a fan to increase the motor's operating life. The airflow inside and outside the motor is relatively small, which results in the generally low efficiency of the DC brush motor in the vacuum cleaner (the highest efficiency is less than 45%). It is not only much lower than the DC brushless motor of the same model and power, but also lower than the efficiency of the general AC brush motor. This method of heat dissipation by installing a fan is not only complex in structure, but also inconvenient to assemble, with high manufacturing cost and poor heat dissipation effect, which affects the motor efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a vacuum cleaner motor assembly with a simple structure, reduced manufacturing cost and improved heat dissipation effect.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] The vacuum cleaner motor assembly includes an outer cover with front and rear ends open, a fixed impeller and an outer shell with front and rear ends open, which are arranged in sequence. A movable impeller is arranged in the outer cover and is located in front of the fixed impeller. A motor is arranged in the outer shell and is located behind the fixed impeller and connected to the movable impeller. The movable impeller is provided with a plurality of first flow channels along its circumference, and the fixed impeller is provided with a plurality of second flow channels connected to the first flow channels along its circumference. The motor has a casing, and an air duct connected to the second flow channel is formed between the outer surface of the casing and the inner wall of the casing. The outer surface of the casing is provided with a plurality of first through holes.

[0006] In this embodiment, since the air flow speed in the air duct is fast, the pressure in the air duct is lower than the pressure in the motor casing. By utilizing the pressure difference between the inside and outside of the motor, the heat in the motor can flow out from the first through hole on the surface of the casing into the air duct, and then flow out along the air duct together with the wind in the air duct, thereby achieving the effect of heat dissipation and reducing the temperature rise in the motor, improving the heat dissipation effect, increasing the motor efficiency, and increasing the motor speed and service life. Using the DC brush motor of this invention, based on the IEC60312 test method, when the maximum input power of the motor is 102.6W, its maximum efficiency is measured to be about 52.4%.

[0007] This embodiment omits the fan in the prior art, simplifies the structure, facilitates assembly and manufacturing, and can reduce manufacturing costs. At the same time, omitting the fan can reduce the axial size of the motor.

[0008] Furthermore, the motor includes a rotor and a stator, the stator includes two fixed magnets surrounding the outer circumference of the rotor, a gap is formed between the circumferential ends of one magnet and the circumferential ends of the other magnet, and the outer surface of the casing corresponding to the gap is provided with a plurality of first through holes.

[0009] Furthermore, the motor also has a rear cover, which covers the rear end of the housing, and the first through hole is arranged close to the rear cover.

[0010] Furthermore, the rotor includes a rotating shaft, an iron core sleeved on the rotating shaft, and a coil winding wound on the iron core. The front end of the rotating shaft passes through the stator impeller forward and is connected to the movable impeller to drive the movable impeller to rotate. The rear end of the rotating shaft extends backward and passes through the rear cover. The magnets are respectively surrounded by the outer peripheral side of the iron core.

[0011] Furthermore, the front and rear ends of the stator impeller are respectively abutted against the rear end of the outer cover and the front end of the outer shell.

[0012] Furthermore, the shell includes a compression section that gradually shrinks backwards, and a guide section that is located at the rear of the compression section and is integrally formed with the compression section. The front end of the compression section is abutted against the rear end of the stator impeller.

[0013] Furthermore, the fixed sleeve outside the casing is provided with a guide cover which gradually shrinks backwards. The guide cover is arranged in the outer casing and located at the rear of the stator impeller. The front end of the guide cover abuts against the rear end surface of the stator impeller.

[0014] Furthermore, the rear end of the deflector shield extends backward to form an annular deflector edge with a gradually increasing diameter.

[0015] Furthermore, the width of the rear end outlet of the air duct is slightly smaller than the outlet width of the second flow channel of the stator impeller.

[0016] Furthermore, the motor also has a rear cover, which covers the rear end of the housing, and is provided with a plurality of second through holes, and the rear end of the rear cover is located at the rear of the rear end of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structure diagram of the vacuum cleaner motor assembly;

[0018] Figure 2 yes Figure 1 A cross-sectional view of

[0019] Figure 3 yes Figure 1 Partial structural diagram of

[0020] Figure 4 It is the structural diagram of the stator impeller;

[0021] Figure 5 It is the internal structure diagram of the motor.

[0022] Wherein: 10: outer cover, 11: housing, 12: rear cover, 13: impeller, 14: stator impeller, 15: first flow channel, 16: second flow channel, 17: casing, 18: air duct, 19: first through hole, 20: first cover plate, 201: air inlet hole, 21: first blade, 22: second cover plate, 23: rim, 24: second blade, 25: outer ring, 26: magnet, 27: gap, 28: rotating shaft, 29: iron core, 30: coil winding, 31: flow guide cover, 32: annular flow guide edge, 111: compression section, 112: flow guide section. Specific embodiments

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] The vacuum cleaner motor assembly, as Figures 1 to 4 shown, includes an outer cover 10 with open front and rear ends, a stator impeller 14, and a housing 11 with open front and rear ends arranged in sequence from front to back. An impeller 13 is arranged in the outer cover and is located in front of the stator impeller 14. A motor is arranged in the housing 11 and is located behind the stator impeller 14 and is connected to the impeller 13. Preferably, the motor is a brushed DC motor. The impeller 13 is provided with a plurality of first flow channels 15 along its circumferential direction, and the stator impeller 14 is provided with a plurality of second flow channels 16 along its circumferential direction that communicate with the first flow channels 15. The motor has a casing 17, and an air duct 18 that communicates with the second flow channels 16 is formed between the outer surface of the casing 17 and the inner wall of the housing 11. A plurality of first through holes 19 are provided on the outer surface of the casing 17, and the first through holes 19 communicate the interior of the motor and the air duct 18. Airflow can sequentially pass through the first flow channels 15 of the impeller 13, the second flow channels 16 of the stator impeller 14, and the air duct 18. It should be noted that in this article, front and rear refer to the direction close to the air inlet along the airflow direction as the front, and the direction close to the air outlet as the rear. Specifically, Figure 2 the lower part in Figure 2 is the "front" in this article,

[0026] The airflow direction in this embodiment is as Figure 2As shown, specifically, due to the fast air flow speed in the air duct, the pressure in the air duct is lower than the pressure in the motor casing. By utilizing the pressure difference between the inside and outside of the motor, the heat in the motor can flow out from the first through hole on the surface of the casing into the air duct, and then flow out along the air duct together with the air flow in the air duct, thereby achieving the effect of heat dissipation and reducing the temperature rise in the motor, improving the heat dissipation effect, and improving the motor efficiency. Using the DC brush motor of this invention, based on the IEC60312 test method, when the maximum input power of the motor is 102.6W, its maximum efficiency is measured to be about 52.4%.

[0027] This embodiment omits the fan in the prior art, simplifies the structure, facilitates assembly and manufacturing, and can reduce manufacturing costs. At the same time, omitting the fan can reduce the axial size of the motor.

[0028] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 5 As shown, the motor includes a rotor and a stator, the stator includes two fixed magnets 26 surrounding the outer circumference of the rotor, a gap 27 is formed between the circumferential ends of one magnet 26 and the circumferential ends of the other magnet 26, and the outer surface of the casing 17 corresponding to the gap 27 is provided with a plurality of first through holes 19. Optionally, the outer surface of the casing 17 corresponding to the gap 27 is provided with 9 first through holes 19 arranged in 3 rows and 3 columns of a rectangle. Of course, the specific number is not limited.

[0029] In this embodiment, the position of the first through hole corresponds to the gap, so that the heat generated by the rotor can be dissipated along the gap and then from the first through hole.

[0030] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the motor further has a rear cover 12 , which covers the rear end of the housing 17 , and the first through hole 19 is disposed close to the rear cover 12 .

[0031] In this embodiment, the first through hole is disposed close to the rear cover to prevent the first through hole from being too close to the stator impeller, causing the airflow flowing out of the stator impeller to flow into the motor through the first through hole.

[0032] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 5 As shown, the rotor includes a rotating shaft 28, an iron core 29 sleeved on the rotating shaft 28, and a coil winding 30 wound on the iron core 29. The front end of the rotating shaft 28 passes through the fixed impeller 14 forward and is connected to the movable impeller 13 to drive the movable impeller 13 to rotate. The rear end of the rotating shaft 28 extends backward and passes through the rear cover 12. The magnets 26 are respectively surrounded on the outer peripheral side of the iron core 29.

[0033] In this embodiment, the rotation of the rotating shaft drives the moving impeller to rotate, thereby achieving airflow from the moving impeller to the stator impeller.

[0034] Further, such as Figures 1 to 4 As shown, the impeller 13 includes a first cover plate 20 and a second cover plate 22 which are arranged opposite to each other in the front and rear directions, and a plurality of first blades 21 which are fixed between the first cover plate 20 and the second cover plate 22 and arranged circumferentially. An air inlet hole 201 is provided at the center of the first cover plate 20, and the first flow channel 15 is formed between two adjacent first blades 21. The inlet of the first flow channel 15 faces the center of the first cover plate 20 and is connected to the air inlet hole 201, and the outlet of the first flow channel 15 faces the inner wall of the outer casing 11 and is connected to the second flow channel 16.

[0035] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the front and rear ends of the stator wheel 14 are respectively abutted against the rear end of the outer cover 10 and the front end of the outer shell 11. Specifically, the stator wheel 14 includes a rim 23, a plurality of second blades 24 arranged around the outer circumference of the rim 23, and an outer ring 25 arranged around the outer circumference of the rim 23. The second flow channel 16 is formed between two adjacent second blades 24. The second blades 24 are fixed between the outer ring 25 and the rim 23. The front and rear ends of the outer ring 23 are respectively abutted against the rear end of the outer cover 10 and the front end of the outer shell 11. The inlet of the second flow channel 16 is arranged forward and connected with the outlet of the first flow channel 15. The outlet of the second flow channel 16 is arranged backward and connected with the inlet of the air duct 18.

[0036] In this embodiment, the fixed impeller is used to achieve airflow conduction between the first flow channel and the wind channel, guide the airflow, and also achieve the connection between the shell and the outer cover, thereby enhancing the strength and reliability of the overall structure.

[0037] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the housing 11 includes a compression section 111 that gradually shrinks backwards, and a guide section 112 that is located at the rear of the compression section 111 and is integrally formed with the compression section 111 . The front end of the compression section 111 is abutted against the rear end of the stator impeller 14 .

[0038] In this embodiment, the diameter is arranged to gradually decrease backwards, which can play a role in compressing the gas, avoid the expansion of the air flow caused by the air duct being too large, reduce the air flow diffusion loss, and ensure that the air flow flows out of the air duct smoothly and quickly.

[0039] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4As shown, the casing 17 is fixedly sleeved with a guide cover 31 which gradually shrinks backwards. The guide cover 31 is arranged in the outer shell 11 and located at the rear of the stator impeller 14 . The front end of the guide cover 31 abuts against the rear end surface of the stator impeller 14 .

[0040] In this embodiment, the air guide cover is provided, which, on the one hand, guides the airflow, and on the other hand, can narrow the width of the flow channel, reduce the airflow diffusion loss, and ensure that the airflow flows out of the air duct smoothly and quickly.

[0041] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the distance between the outer surface of the air guide cover 31 and the inner wall of the housing 11 is slightly greater than, slightly less than or equal to the outlet width of the second flow channel 16 of the stator impeller 14 .

[0042] In this embodiment, the distance between the outer surface of the air guide cover and the inner wall of the shell is set to avoid airflow energy loss caused by excessive distance, thereby ensuring the airflow speed.

[0043] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the rear end of the air guide cover 31 extends backward to form an annular air guide edge 32 with a gradually increasing diameter.

[0044] In this embodiment, an annular guide edge with a diameter gradually increasing backward is provided so that the annular guide edge extends in a direction away from the motor housing, thereby playing a guiding role and preventing the airflow flowing out of the stator impeller from flowing into the motor through the first through hole.

[0045] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the width of the rear end outlet of the air duct 18 is slightly smaller than the outlet width of the second flow channel 16 of the stator impeller 14 .

[0046] In this embodiment, the width of the outlet at the rear end of the air duct is reduced, which can increase the gas flow rate, ensure that the air flow passes through the air duct smoothly, and improve the motor efficiency.

[0047] In order to further optimize the technical effect of the present invention, in some other implementation modes, based on the above contents, preferably, Figures 1 to 4 As shown, the motor also has a rear cover 12, which covers the rear end of the housing 17. The rear cover 12 is provided with a plurality of second through holes (not shown in the figure). The rear end of the rear cover 12 is located at the rear of the rear end of the housing 11. Preferably, the axial length of the rear end of the rear cover 12 from the rear end of the housing 11 is 2 to 5 mm.

[0048] In this embodiment, by providing the second through hole, external air can enter the motor through the second through hole, thereby realizing air circulation in the motor and playing a role in heat dissipation for the motor.

[0049] In this embodiment, the air pressure at the rear end outlet of the air duct is relatively lower than the air pressure inside the motor. In this embodiment, the rear end of the rear cover is located behind the rear end of the shell to prevent external air from entering the air duct from the rear end outlet of the air duct, thereby ensuring that external air can smoothly enter the motor and achieve heat dissipation of the motor.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A vacuum cleaner motor assembly, characterized in that: The invention comprises an outer cover with front and rear ends opened in sequence, a fixed impeller and an outer shell with front and rear ends opened, a movable impeller located in front of the fixed impeller is arranged in the outer cover, a motor located behind the fixed impeller and connected to the movable impeller is arranged in the outer shell, the movable impeller is provided with a plurality of first flow channels along its circumference, the fixed impeller is provided with a plurality of second flow channels connected with the first flow channels along its circumference, the motor has a casing, an air duct connected with the second flow channel is formed between the outer surface of the casing and the inner wall of the casing, a plurality of first through holes are arranged on the outer surface of the casing, a guide cover which gradually shrinks backwards is arranged on the fixed sleeve outside the casing, the guide cover is arranged in the outer shell and located at the rear of the fixed impeller, the front end of the guide cover abuts against the rear end face of the fixed impeller, and the rear end of the guide cover extends backwards to form an annular guide edge with a gradually increasing diameter.

2. The vacuum cleaner motor assembly according to claim 1, characterized in that: The motor includes a rotor and a stator, the stator includes two fixed magnets surrounding the outer circumference of the rotor, a gap is formed between the circumferential ends of one magnet and the circumferential ends of the other magnet, and the outer surface of the casing corresponding to the gap is provided with a plurality of first through holes.

3. The vacuum cleaner motor assembly according to claim 2, characterized in that: The motor also has a rear cover, which covers the rear end of the housing, and the first through hole is arranged close to the rear cover.

4. The vacuum cleaner motor assembly according to claim 3, characterized in that: The rotor includes a rotating shaft, an iron core sleeved on the rotating shaft, and a coil winding wound on the iron core. The front end of the rotating shaft passes through the fixed impeller forward and is connected to the movable impeller to drive the movable impeller to rotate. The rear end of the rotating shaft extends backward and passes through the rear cover. The magnets are respectively surrounded on the outer circumference of the iron core.

5. The vacuum cleaner motor assembly according to claim 1, characterized in that: The front and rear ends of the stator impeller are respectively abutted against the rear end of the outer cover and the front end of the shell.

6. The vacuum cleaner motor assembly according to claim 1, characterized in that: The shell includes a compression section which gradually shrinks backwards, and a guide section which is located at the rear of the compression section and is integrally formed with the compression section. The front end of the compression section is abutted against the rear end of the stator impeller.

7. The vacuum cleaner motor assembly according to claim 1, characterized in that: The width of the rear end outlet of the air duct is slightly smaller than the outlet width of the second flow channel of the stator impeller.

8. The vacuum cleaner motor assembly according to claim 1, characterized in that: The motor also has a rear cover, which covers the rear end of the housing, is provided with a plurality of second through holes, and the rear end of the rear cover is located at the rear of the rear end of the housing.

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