Motor and blower using same

Abstract

The utility model relates to a motor and a blower using the same. The motor comprises a stator, a rotating shaft extending along the longitudinal direction, a rotor connected to the rotating shaft, and a bearing assembly located between the stator and the rotating shaft. The bearing assembly comprises a first bearing which is supported on one side of the stator in the longitudinal direction and a second bearing which is supported on the other side of the stator; the motor comprises a dustproof assembly arranged on the rotating shaft in a sleeving mode, and the dustproof assembly comprises a first dustproof piece located on the side, away from the second bearing, of the first bearing and a second dustproof piece located on the side, away from the first bearing, of the second bearing. An isolation space is defined by the first dustproof piece, the second dustproof piece, the rotating shaft and the stator, and the first bearing and the second bearing are located in the isolation space, so that the situation that dust enters the bearings to cause bearing failure is avoided.

Description

Technical Field

[0001] This utility model relates to an electric motor and a hair dryer using the electric motor, and more particularly to an electric motor with good dustproof effect and a hair dryer using the electric motor. Background Technology

[0002] A hair dryer is a common garden tool. It consists of a housing, a motor and fan housed within the housing, and a battery pack connected to the housing. The motor drives the fan to generate a rotating airflow to collect debris. The unique blowing performance of a hair dryer often results in a significant amount of dust and impurities being present in the surrounding environment during operation. This dust and impurities can often enter the hair dryer's interior along with the airflow, sometimes even causing blockages in the motor or jamming the bearings.

[0003] Therefore, it is indeed necessary to provide an improved motor and hair dryer to overcome the shortcomings of the existing technology. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a motor with better dustproof effect and a hair dryer using the motor.

[0005] The present invention solves the existing technical problems by adopting the following technical solution: an electric motor, including a stator, a longitudinally extending shaft, a rotor connected to the shaft, and a bearing assembly located between the stator and the shaft. The bearing assembly includes a first bearing supported on one side of the stator longitudinally and a second bearing supported on the other side of the stator. The electric motor includes a dustproof assembly sleeved on the shaft. The dustproof assembly includes a first dustproof component located on the side of the first bearing opposite to the second bearing and a second dustproof component located on the side of the second bearing opposite to the first bearing. The first dustproof component, the second dustproof component, the shaft, and the stator form an isolation space, and the first bearing and the second bearing are located within the isolation space.

[0006] A further improvement is as follows: the dustproof component includes an elastic element sleeved on the rotating shaft and a bushing located between the second dustproof component and the elastic element, wherein the second dustproof component is located between the second bearing and the bushing.

[0007] A further improvement is as follows: the end of the rotating shaft near the first bearing is provided with an enlarged diameter section, the diameter of the enlarged diameter section is larger than the diameter of the rotating shaft, and the enlarged diameter section abuts against the side of the first dustproof component away from the first bearing.

[0008] A further improvement is as follows: the stator includes a stator support and a winding sleeved on the stator support, the first bearing is located between the winding and the rotating shaft, and the second bearing is located between the stator support and the rotating shaft.

[0009] A further improvement is that the expanded diameter section, the first dustproof component, the first bearing, and the stator support are arranged sequentially in the longitudinal direction.

[0010] A further improvement is as follows: the first dustproof component is configured as a dustproof pad, the dustproof pad includes a pressing part that abuts against the first bearing and a covering part that extends away from the pressing part away from the first bearing, the covering part and the first bearing being spaced apart in the longitudinal direction.

[0011] The present invention can also solve the existing technical problems by adopting the following technical solution: A hair dryer includes a housing, a motor and a fan housed in the housing, the housing including a longitudinally extending airflow channel and a receiving outer shell located in the airflow channel, the motor being located in the receiving outer shell, the motor including a rotating shaft, a rotor, a stator and a first bearing and a second bearing supported between the rotating shaft and the stator; the motor including a dustproof assembly sleeved on the rotating shaft, the dustproof assembly including a first dustproof component located on the side of the first bearing opposite to the second bearing and a second dustproof component located on the side of the second bearing opposite to the first bearing, the first dustproof component, the second dustproof component, the rotating shaft and the stator forming an isolation space, the first bearing and the second bearing being located within the isolation space.

[0012] A further improvement is as follows: the housing includes an air inlet and an air outlet that are in fluid communication with the airflow channel, a cooling channel for airflow to pass through the motor is provided between the air inlet and the air outlet, and the isolation space is located within the cooling channel and is isolated from the cooling channel.

[0013] A further improvement is as follows: the fan is connected to the rotating shaft, and the dustproof assembly includes a bushing and an elastic element located between the fan and the second bearing. The elastic element biases the bushing to absorb the longitudinal gap between the second bearing and the fan.

[0014] A further improvement is as follows: the rotor includes a peripheral wall sleeved on the outside of the stator and an end cover connected between the peripheral wall and the rotating shaft, the end cover including a through hole communicating with the interior of the motor and the cooling channel.

[0015] Compared with the prior art, the present invention has the following advantages: by setting a first dustproof component on the outside of the first bearing and a second dustproof component on the outside of the second bearing, an isolation space separated from the airflow is formed between the first dustproof component, the rotating shaft, the stator and the second dustproof component, and the first bearing and the second bearing are placed in the isolation space, thereby avoiding the risk of dust entering the bearing with the airflow and causing bearing failure, improving the service life of the bearing while providing a stable and reliable connection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a hair dryer according to a preferred embodiment of the present invention;

[0017] Figure 2 for Figure 1 An exploded view of the duct assembly of the hair dryer shown.

[0018] Figure 3 for Figure 1 A cross-sectional view of the duct assembly of the hair dryer shown;

[0019] Figure 4 for Figure 3 A partial enlarged view of the duct assembly shown;

[0020] Figure 5 for Figure 1 The diagram shows the structure of the first dustproof component of the hair dryer.

[0021] Meaning of the reference numerals in the diagram:

[0022] Hair dryer 100, housing 10

[0023] Airflow channel 11 Main body 12

[0024] Hair dryer 13 Installation part 14

[0025] Air inlet 15, Air outlet 16

[0026] Duct assembly 20 Support base 21

[0027] Housing 22, Fixing base 221

[0028] Guide cone 222, air inlet 223

[0029] Air outlet 224 Cooling channel 225

[0030] 23 guide vanes, 30 motors

[0031] Shaft 31, Expanded Diameter Section 311

[0032] Rotor 32 Peripheral wall 321

[0033] End cap 322 Stator 33

[0034] Stator support 331, winding 332

[0035] First bearing 34 Second bearing 35

[0036] Fan 40, Wheel 41

[0037] Fan blades 42, dustproof components 50

[0038] First dustproof component 51 Second dustproof component 52

[0039] Pressing parts 511, 521; Covering parts 512, 522

[0040] Elastic component 53, bushing 54 Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0042] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "axial," "lateral," "vertical," "circumferential," and "radial," which indicate orientation or positional relationships, are based solely on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0043] Please refer to Figures 1 to 3 As shown, this utility model relates to a garden tool, and more particularly to a hair dryer 100, including a housing 10 extending longitudinally, a motor 30 and a fan 40 housed within the housing 10. The housing 10 includes an air inlet 15, an air outlet 16, an airflow channel 11 located between the air inlet 15 and the air outlet 16, and a duct assembly 20 forming part of the airflow channel 11.

[0044] The housing 10 includes a body portion 12 for accommodating the duct assembly 20, a blower 13 detachably connected to the longitudinal front end of the body portion 12, a mounting portion 14 extending rearward from the longitudinal rear end of the body portion 12, and a handle connected to the top side of the body portion 12 and the mounting portion 14. An air inlet 15 is located on the outer peripheral wall of the body portion 12 and longitudinally at the front end of the mounting portion 14. A battery pack (not shown) is detachably connected to the mounting portion 14. The handle is located on the top side of the body portion 12 and the mounting portion 14 with a certain space between them for the user to grip.

[0045] The duct assembly 20 is fixed to the interior of the main body 12 and forms an airflow channel 11 with the blower 13 for airflow. The duct assembly 20 includes a support base 21 fixed in the main body 12, a housing 22 fixed in the support base 21, and several stationary guide vanes 23 located between the support base 21 and the housing 22. The support base 21 is generally hollow cylindrical and forms part of the airflow channel 11, and the housing 22 is located in the airflow channel 11.

[0046] The housing 22 includes a cylindrical base 221 and a guide cone 222 connected to the longitudinal front end of the base 221. The guide cone 222 and the base 221 together form a housing space for accommodating the motor 30. The guide cone 222 is provided with an air inlet 223 communicating with the airflow channel 11, and the base 221 is provided with an air outlet 224 communicating with the airflow channel 11. The air inlet 223 and the air outlet 224 form a cooling channel 225 for cooling the motor 30.

[0047] Combination Figure 4 As shown, the motor 30 is located within the cooling channel 225 and includes a longitudinally extending shaft 31, a rotor 32 fixed to the shaft 31, a stator 33 connected to the shaft 31, and a bearing assembly supported between the shaft 31 and the stator 33. The stator 33 includes a stator support 331 and a winding 332 sleeved on the stator support 331. One end of the stator support 331 is fixed to the side cover of the mounting base 221 by screws. The rotor 32 includes a peripheral wall 321 sleeved on the outside of the winding 332 of the stator and an end cap 322 connected between the peripheral wall 321 and the shaft 31. The bearing assembly includes a first bearing 34 supported longitudinally on one side of the stator 33 and a second bearing 35 supported on the other side of the stator 33. The first bearing 34 is supported longitudinally at the front end of the stator support 331 and radially between the shaft 31 and the stator winding 332. The second bearing 35 is supported longitudinally at its rear and radially between the stator support 331 and the shaft 31. The stator 33 is fixedly supported on the shaft 31 by the first bearing 34 and the second bearing 35, which are spaced apart longitudinally.

[0048] The rotor end cover 322 is located on the side away from the mounting base 221 and longitudinally in front of the first bearing 34. The rotor end cover 322, the peripheral wall 321, the stator 33, and the side cover of the mounting base 221 constitute the internal space of the motor 30. The rotor end cover 322 includes a through hole connecting the interior of the motor 30 with the cooling channel 225 to introduce airflow into the interior of the motor 30.

[0049] A fixed base 221 extends from the longitudinal rear end of the rotating shaft 31. The fan 40 is connected to the extended portion of the rotating shaft 31 and rotates together with the motor 30. The fan 40 includes a hub 41 connected to the rotating shaft 31 without relative rotation and several fan blades 42 extending from the hub 41 into the airflow channel 11. When the blower 100 is working, the rotation of the motor 30 drives the fan 40 to rotate, creating a pressure difference between the inside and outside of the housing 10. Under the influence of the pressure difference, air enters the inside of the housing 10 and forms an airflow within the airflow channel 11. After the airflow enters the housing 10 through the air inlet 15, it is first accelerated by the rotation of the fan 40, and then combed into a longitudinal airflow that flows roughly in the longitudinal direction by the stationary guide vane 23. When passing through the guide cone 222, due to the pressure difference between the inside and outside of the housing 22, part of the airflow enters the interior of the housing 22 through the air inlet 223 of the guide cone 222, and then enters the interior of the motor 30 through the through hole of the rotor end cover 322. After flowing through the gap between the rotor 32 and the stator 33, it flows out from the air outlet 224 of the fixed seat 221 and merges into the airflow channel 11, thereby completing the heat dissipation of the motor 30.

[0050] To prevent dust from entering the motor 30 or bearing assembly with the airflow, thus avoiding bearing failure, this invention includes a dustproof component 50 inside the motor 30. The dustproof component 50 is fitted onto the rotating shaft 31 and includes a first dustproof element 51 located on the side of the first bearing 34 opposite to the second bearing 35, and a second dustproof element 52 located on the side of the second bearing 35 opposite to the first bearing 34. The first dustproof element 51, the second dustproof element 52, the rotating shaft 31, and the stator 33 form an isolation space, within which the first bearing 34 and the second bearing 35 are located. This isolation space is located within and isolated from the cooling channel 225 of the motor 30. This arrangement prevents airflow from passing through the bearing assembly, thus preventing dust from entering the bearing and avoiding the risk of bearing failure caused by dust. The isolation space can be a completely sealed space or a partially sealed space that can block dust from entering with the airflow in the longitudinal direction, as long as it can block airflow from passing through the bearing assembly in the longitudinal direction.

[0051] The shaft 31 has an enlarged diameter section 311 at one end near the first bearing 34. The end cap 322 of the rotor 32 is fixed to the enlarged diameter section 311 to rotate together with the shaft 31. The diameter of the enlarged diameter section 311 is larger than the diameter of the shaft 31 to form a stepped section at the longitudinal rear end of the enlarged diameter section 311. The first dustproof member 51 is located longitudinally between the first bearing 34 and the stepped section.

[0052] Combination Figure 5As shown, the first dustproof component 51 is configured as a dustproof gasket or a sealing damper, or a similar structure. The first dustproof component 51 includes a pressing portion 511 that abuts against the first bearing 34 and a covering portion 512 extending from the pressing portion 511 away from the first bearing 34. The pressing portion 511 abuts against the inner ring of the first bearing 34, and the covering portion 512 covers the outer ring of the first bearing 34 and a portion of the winding 332. The expanded diameter portion 311, the first dustproof component 51, the first bearing 34, and the stator support 331 are arranged sequentially in the longitudinal direction and are limited in the longitudinal direction by a stepped portion. The covering portion 512 is spaced apart from the outer ring of the first bearing 34 and the winding 332 in the longitudinal direction, thereby preventing the rotation of the first dustproof component 51 after it is connected to the shaft 31 from affecting the outer ring of the first bearing 34 and the winding 332.

[0053] The dustproof assembly 50 further includes an elastic element 53 sleeved on the rotating shaft 31 and a bushing 54 located between the second dustproof element 52 and the elastic element 53. The second dustproof element 52 is located between the second bearing 35 and the bushing 54. In the longitudinal direction, the second bearing 35, the second dustproof element 52, the bushing 54, the elastic element 53, and the fan hub 41 are arranged sequentially. The second dustproof element 52 is configured as a dustproof gasket or a sealing damping structure or similar. The second dustproof element 52 includes a pressing part 521 that abuts against the second bearing 35 and a covering part 522 extending from the pressing part 521 away from the second bearing 35. The pressing part 521 abuts against the inner ring of the second bearing 35, and the covering part 522 covers the outer ring of the second bearing 35 and a portion of the stator support 331. The cover 522 is spaced longitudinally from the outer ring of the second bearing 34 and the stator support 331, so as to prevent the rotation of the second dustproof part 52 after it is connected to the rotating shaft 31 from affecting the outer ring of the second bearing 35 and the stator support 331.

[0054] The second bearing 35 is press-fitted to the rotating shaft 31 and longitudinally abuts against the stator bracket 331 for positioning. To fix the second bearing 35 longitudinally, a bushing 54 is press-fitted between the second dustproof component 52 and the fan hub 41 for positioning. However, the bushing 54 cannot guarantee that it will completely fill the gap between the second bearing 35 and the fan hub 41. Excessive compression will damage the bearing, while leaving a certain gap will cause the bearing to move. Therefore, an elastic element 53 is sleeved between the bushing 54 and the fan hub 41. The elastic element 53 biases the bushing 54 to absorb the longitudinal gap between the second bearing 35 and the fan hub 41, so that it will not be excessively compressed and damage the bearing, nor will it leave a gap that allows the bearing and other components to move erratically. In this embodiment, the elastic element 53 is configured as a wave-shaped gasket, but in other embodiments, the elastic element can be a spring, damper, foam, sponge, or other elastic structures.

[0055] This invention creates an isolation space between the first dustproof component 51, the rotating shaft 31, the stator 33, and the second dustproof component 52, which is separated from the airflow, by setting a first dustproof component 51 on the outside of the first bearing 34 and a second dustproof component 52 on the outside of the second bearing 35. The first bearing 34 and the second bearing 35 are placed in this isolation space, thereby avoiding the risk of dust entering the bearing with the airflow and causing bearing failure. In addition, a bushing and an elastic element are set between the second dustproof component 52 and the fan 40 to axially limit the second bearing 35, and the elastic element 53 absorbs the longitudinal gap to ensure the stable installation of the second bearing 35, thereby improving the service life of the bearing and providing a stable and reliable connection.

[0056] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist for the garden tools of this utility model without departing from the principles and scope thereof. The scope of protection of this utility model is defined by the claims.

Claims

1. An electric motor, comprising a stator, a longitudinally extending shaft, a rotor connected to the shaft, and a bearing assembly located between the stator and the shaft, the bearing assembly including a first bearing supporting one side of the stator longitudinally and a second bearing supporting the other side of the stator; characterized in that: The motor includes a dustproof assembly sleeved on the rotating shaft. The dustproof assembly includes a first dustproof component located on the side of the first bearing opposite to the second bearing and a second dustproof component located on the side of the second bearing opposite to the first bearing. The first dustproof component, the second dustproof component, the rotating shaft, and the stator form an isolation space, and the first bearing and the second bearing are located within the isolation space.

2. The motor according to claim 1, characterized in that: The dustproof assembly includes an elastic element sleeved on the rotating shaft and a bushing located between the second dustproof element and the elastic element, wherein the second dustproof element is located between the second bearing and the bushing.

3. The motor according to claim 1, characterized in that: The shaft has an enlarged diameter section at one end near the first bearing. The diameter of the enlarged diameter section is larger than the diameter of the shaft. The enlarged diameter section abuts against the side of the first dustproof component away from the first bearing.

4. The motor according to claim 3, characterized in that: The stator includes a stator bracket and a winding sleeved on the stator bracket. The first bearing is located between the winding and the rotating shaft, and the second bearing is located between the stator bracket and the rotating shaft.

5. The motor according to claim 4, characterized in that: The enlarged diameter section, the first dustproof component, the first bearing, and the stator support are arranged in sequence in the longitudinal direction.

6. The motor according to claim 1, characterized in that: The first dustproof component is configured as a dustproof pad, which includes a pressing portion that abuts against the first bearing and a covering portion that extends away from the pressing portion away from the first bearing. The covering portion and the first bearing are spaced apart in the longitudinal direction.

7. A hair dryer, comprising a housing, a motor and a fan housed within the housing, the housing including a longitudinally extending airflow channel and a receiving outer shell located within the airflow channel, the motor being located within the receiving outer shell, the motor including a rotating shaft, a rotor, a stator, and a first bearing and a second bearing supported between the rotating shaft and the stator; characterized in that: The motor includes a dustproof assembly sleeved on the rotating shaft. The dustproof assembly includes a first dustproof component located on the side of the first bearing opposite to the second bearing and a second dustproof component located on the side of the second bearing opposite to the first bearing. The first dustproof component, the second dustproof component, the rotating shaft, and the stator form an isolation space, and the first bearing and the second bearing are located within the isolation space.

8. The hair dryer according to claim 7, characterized in that: The housing includes an air inlet and an air outlet in fluid communication with the airflow channel. A cooling channel is provided between the air inlet and the air outlet for airflow to pass through the inside of the motor. The isolation space is located within the cooling channel and is isolated from the cooling channel.

9. The hair dryer according to claim 8, characterized in that: The fan is connected to the shaft, and the dustproof assembly includes a bushing and an elastic element located between the fan and the second bearing. The elastic element biases the bushing to absorb the longitudinal clearance between the second bearing and the fan.

10. The hair dryer according to claim 8, characterized in that: The rotor includes a peripheral wall sleeved on the outside of the stator and an end cover connecting the peripheral wall and the shaft. The end cover includes a through hole communicating with the interior of the motor and the cooling channel.

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