Noise reduction type blower motor

Abstract

The utility model discloses a noise reduction type blower motor, which comprises a casing, a movable impeller, a stator assembly, a rotor assembly, a first bearing, a second bearing and a bushing, the stator assembly is arranged in the casing, the rotor assembly is matched with the stator assembly, the rotor assembly comprises a rotating shaft, one end of the rotating shaft penetrates through the casing and then extends out, the movable impeller is sleeved on the outer side of one end of the rotating shaft, and the bushing is arranged in the casing. An air channel is integrally formed on the outer side of the machine shell and corresponds to the movable impeller, the rotating shaft is sleeved with the first bearing and the second bearing, the rotating shaft is matched with the machine shell through the first bearing and the second bearing, the rotating shaft is sleeved with the bush, and the two ends of the bush abut against the first bearing and the second bearing respectively. The bushing abuts against the two bearings at the two ends, so that the bushing can conveniently provide axial pre-tightening force for the bearings at the two ends; the bushing can be conveniently machined into the required length through machining, the actual length is easy to control, the requirement of the axial pre-tightening force of the bearing is met, the pre-tightening force is prevented from being too small or too large, and noise generated when the motor is used can be reduced.

Description

Technical Field

[0001] The utility model belongs to a motor, in particular to a motor for a noise-reducing hair dryer. Background Art

[0002] For the motor used in a hair dryer, when in use, the motor rotates at a high speed. When the rotating shaft rotates at a high speed, since the rotating shaft is sleeved in the casing through a bearing, when the pre-tightening force of the bearing is insufficient, the bearing is prone to looseness when the rotating shaft rotates at a high speed, thereby increasing the noise of the entire motor and making the noise of the entire hair dryer increase. In order to give a certain axial pre-tightening force to the bearing, the patent application No. 202322976562.7 discloses a high-speed hair dryer motor with a noise reduction structure, in which a spring is used to provide axial pre-tightening force for two bearings. However, the length of the spring is relatively difficult to control. If the spring is too long, the bearing bears a large force, the temperature of the motor rises, the sound is sharp, and the service life of the motor is short; if the spring is too short, the noise of the motor is too large. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a motor for a noise-reducing hair dryer that can solve at least one of the above problems.

[0004] According to one aspect of the utility model, there is provided a motor for a noise-reducing hair dryer, including a casing, an impeller, a stator assembly, a rotor assembly, a first bearing, a second bearing and a bushing. The stator assembly is arranged in the casing, the rotor assembly is matched with the stator assembly, the rotor assembly includes a rotating shaft, one end of the rotating shaft penetrates through the casing and extends out, the impeller is sleeved outside one end of the rotating shaft, a wind channel is integrally formed on the outside of the casing, the wind channel is correspondingly arranged with the impeller, both the first bearing and the second bearing are sleeved on the rotating shaft, the rotating shaft is matched with the casing through the first bearing and the second bearing, the bushing is sleeved on the rotating shaft, and both ends are respectively abutted against the first bearing and the second bearing.

[0005] The beneficial effect of the utility model is that by installing a bushing between the two bearings, and abutting the two bearings at both ends through the bushing, it is convenient for the bushing to provide axial pre-tightening force for the two bearings at both ends. Due to the adoption of the bushing, it is convenient for the bushing to be machined to the required length through machining, and the actual length is easy to control. During assembly, according to the installation distance between the two bearings in the actual motor, the length of the bushing is adjusted to meet the requirements of the bearing axial pre-tightening force, avoiding too small or too large pre-tightening force, and being beneficial to reducing the noise generated during the use of the motor.

[0006] In some embodiments, a cylinder is provided on the outer side of the casing. A wind channel is formed between the cylinder and the casing. The cylinder and the casing are of an integrally formed structure. A flow guide plate is provided in the wind channel. The impeller is located above the flow guide plate and inside the cylinder. The flow guide plate and the casing are of an integrally formed structure. Thus, through the integrally formed structure of the cylinder and the casing, the generation of gaps between the cylinder and the flow guide plate is avoided, the turbulent flow of the air flow is reduced, which is beneficial to reducing noise. At the same time, it is convenient for the processing and forming of the wind channel.

[0007] In some embodiments, a stop is provided on the inner wall of the cylinder. The distance between the impeller and the inner wall of the cylinder is less than the width of the stop. The stop is located between the flow guide plate and the impeller. Thus, by providing the stop, the air flow formed between the impeller and the inner wall of the cylinder can be blocked, which is beneficial to the air flow flowing out of the wind channel and preventing turbulent flow and cross flow.

[0008] In some embodiments, an installation step is provided on the upper part of the casing. The impeller includes an installation part and blades. The blades are provided on the outer periphery of the installation part. The installation part is sleeved on the rotating shaft. The installation part is provided with a U-shaped groove, and the U-shaped groove is located above the installation step. Thus, by providing the installation step, it is convenient to shorten the length of the entire motor, which is beneficial to reducing the overall volume, thus facilitating installation and beneficial to reducing the volume of the entire hair dryer.

[0009] In some embodiments, the lower end surface of the flow guide plate is flush with the lower end surface of the cylinder. Thus, the entire wind channel can guide the air flow, prevent the occurrence of turbulent flow, and reduce the generation of noise.

[0010] In some embodiments, anti-slip threads are provided on the outer periphery of the upper end of the rotating shaft. The first bearing, the second bearing and the bushing are all located outside the anti-slip threads. Thus, by providing the anti-slip threads, the friction between the structures in contact with each other can be increased, and the stability of the combination can be improved.

[0011] In some embodiments, a grounding terminal is provided at the lower end of the cylinder. The lower end surface of the cylinder bulges downward to form the grounding terminal. Thus, through the grounding terminal, the connection of the corresponding wire can be facilitated without additionally installing a joint structure, simplifying the overall structure.

[0012] In some embodiments, a groove is provided at the lower end of the cylinder, and a grounding terminal is provided in the groove. Thus, through the grounding terminal, the connection of the corresponding wire can be facilitated without additionally installing a joint structure, simplifying the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural view of the motor for a noise reduction hair dryer of the present utility model.

[0014] Figure 2 is a schematic cross-sectional structural view of the motor for a noise reduction hair dryer of the present utility model.

[0015] Figure 3 It is a schematic structural diagram of the housing in one embodiment of the motor for the noise reduction hair dryer of the present utility model.

[0016] Figure 4 It is a schematic structural diagram of the housing in another embodiment of the motor for the noise reduction hair dryer of the present utility model. Detailed implementation manners

[0017] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] Refer to Figures 1 to 2 . The motor for the noise reduction hair dryer includes a housing 1, an impeller 2, a stator assembly 3, a rotor assembly 4, a first bearing 5, a second bearing 6 and a bushing 7. The stator assembly 3 is arranged inside the housing 1. The rotor assembly 4 is matched with the stator assembly 3. The rotor assembly 4 includes a rotating shaft 41. One end of the rotating shaft 41 penetrates through the housing 1 and extends out. The impeller 2 is sleeved on the outer side of one end of the rotating shaft 41. An air duct 8 is integrally formed on the outer side of the housing 1. The air duct 8 is arranged corresponding to the impeller 2, that is, the air flow formed when the impeller 2 rotates can flow along the air duct 8. Both the first bearing 5 and the second bearing 6 are sleeved on the rotating shaft 41. The rotating shaft 41 is matched with the housing 1 through the first bearing 5 and the second bearing 6. The bushing 7 is sleeved on the rotating shaft 41 and abuts against the first bearing 5 and the second bearing 6 at both ends respectively. Among them, the stator assembly 3 is composed of a stator frame and windings commonly used in existing motors. The stator frame is fixed on the housing 1, and the windings are wound on the stator frame.

[0019] When assembling the motor for the noise reduction hair dryer, according to the actual distance between the first bearing 5 and the second bearing 6, the bushing 7 is machined to a suitable length. Machining is used for the bushing 7, and the length dimension is easy to control. During assembly, a pre-tightening force is applied with a weight, and through the action of the bushing on the two end bearings, the required pre-tightening force is maintained. Thus, after assembly, the axial pre-tightening forces received by the first bearing 5 and the second bearing 6 are stable, preventing the axial movement of the bearings and reducing the overall noise. During operation, the rotating shaft 41 drives the impeller 2 to rotate, and the air flow formed by the rotation of the impeller 2 can dissipate heat from the motor and improve the heat dissipation efficiency.

[0020] A cylinder 11 is arranged on the outer side of the housing 1. An air duct 8 is formed between the cylinder 11 and the housing 1. The cylinder 11 and the housing 1 are of an integrally formed structure. A flow guide plate 12 is arranged in the air duct 8. The impeller 2 is located above the flow guide plate 12 and inside the cylinder 11. The flow guide plate 12 and the housing 1 are of an integrally formed structure. The flow guide plate 12 can guide the air flow generated when the impeller 2 rotates, so that the air flow flows out from the air duct 8, avoiding the phenomenon of air flow turbulence and reducing the generation of noise.

[0021] The inner wall of the cylinder body 11 is formed with a retaining position 13. The distance between the moving impeller 2 and the inner wall of the cylinder body 11 is less than the width of the retaining position 13, and the retaining position 13 is located between the guide vane 12 and the moving impeller 2. Therefore, when the moving impeller 2 rotates, the air flow formed between the moving impeller 2 and the inner wall of the cylinder body 11 is blocked by the retaining position 13 and flows along the air duct 8, avoiding the cross-flow of this part of the air flow and reducing the noise.

[0022] An installation step 14 is provided at the upper part of the casing 1. The moving impeller 2 includes an installation part 21 and blades 22. The blades 22 are arranged on the outer periphery of the installation part 21. The installation part 21 is sleeved on the rotating shaft 41, and a U-shaped groove 23 is provided on the installation part 21. The U-shaped groove 23 is located above the installation step 14. Among them, the moving impeller 2 is an integrally formed structure; the U-shaped groove 23 is located above the installation step 14, which is convenient for the installation of the installation part 21. After the moving impeller 2 is installed, the overall length of the moving impeller 2 and the casing 1 is reduced, thereby facilitating the reduction of the volume of the entire motor and the requirements for the motor installation space.

[0023] The lower end surface of the guide vane 12 is flush with the lower end surface of the cylinder body 11. Thus, the air flow can be guided under the action of the guide vane 12 throughout the air duct, preventing the air flow from occurring in a turbulent flow phenomenon and facilitating the reduction of noise generation.

[0024] Anti-slip threads 411 are provided on the outer periphery of the upper end of the rotating shaft 41. The first bearing 5, the second bearing 6, and the bushing 7 are all located outside the anti-slip threads 411. Through the anti-slip threads 411, the stability of the cooperation of each structure on the rotating shaft 41 can be improved, effectively preventing loosening and improving the service life of the motor.

[0025] As Figure 3 shown, in one embodiment, a grounding terminal 9 is provided at the lower end of the cylinder body 11, and the lower end surface of the cylinder body 11 bulges downward to form the grounding terminal 9. Among them, the grounding terminal 9 and the cylinder body 11 are of an integrally formed structure, which is convenient for connecting with the grounding wire, and there is no need to additionally install wiring heads and other structures outside the motor, simplifying the structure of the entire motor.

[0026] As Figure 4 shown, in another embodiment, a groove 111 is formed at the lower end of the cylinder body 11, and the grounding terminal 9 is provided in the groove 111. Thus, it is convenient to connect with the external grounding wire and simplifies the structure of the entire motor.

[0027] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. The motor for a noise-reducing hair dryer is characterized in that, It includes a housing (1), a dynamic impeller (2), a stator assembly (3), a rotor assembly (4), a first bearing (5), a second bearing (6) and a bushing (7). The stator assembly (3) is arranged inside the housing (1). The rotor assembly (4) is matched with the stator assembly (3). The rotor assembly (4) includes a rotating shaft (41). One end of the rotating shaft (41) penetrates through the housing (1) and extends out. The dynamic impeller (2) is sleeved on the outer side of one end of the rotating shaft (41). An air duct (8) is integrally formed on the outer side of the housing (1). The air duct (8) is arranged corresponding to the dynamic impeller (2). Both the first bearing (5) and the second bearing (6) are sleeved on the rotating shaft (41). The rotating shaft (41) is matched with the housing (1) through the first bearing (5) and the second bearing (6). The bushing (7) is sleeved on the rotating shaft (41) and abuts against the first bearing (5) and the second bearing (6) at both ends respectively.

2. The motor for a noise-reducing hair dryer according to claim 1, characterized in that, A cylinder body (11) is arranged on the outer side of the housing (1). An air duct (8) is formed between the cylinder body (11) and the housing (1). The cylinder body (11) and the housing (1) are of an integrally formed structure. A flow guide plate (12) is arranged inside the air duct (8). The dynamic impeller (2) is located above the flow guide plate (12) and inside the cylinder body (11). The flow guide plate (12) and the housing (1) are of an integrally formed structure.

3. The motor for a noise-reducing hair dryer according to claim 2, characterized in that, A gear position (13) is arranged on the inner wall of the cylinder body (11). The distance between the dynamic impeller (2) and the inner wall of the cylinder body (11) is less than the width of the gear position (13). The gear position (13) is located between the flow guide plate (12) and the dynamic impeller (2).

4. The motor for a noise-reducing hair dryer according to claim 2 or 3, characterized in that, An installation step (14) is arranged on the upper part of the housing (1). The dynamic impeller (2) includes an installation part (21) and blades (22). The blades (22) are arranged on the outer periphery of the installation part (21). The installation part (21) is sleeved on the rotating shaft (41). The installation part (21) is provided with a U-shaped groove (23). The U-shaped groove (23) is located above the installation step (14).

5. The motor for a noise-reducing hair dryer according to claim 2, characterized in that, The lower end surface of the flow guide plate (12) is flush with the lower end surface of the cylinder body (11).

6. The motor for a noise-reducing hair dryer according to claim 1, characterized in that, Anti-slip threads (411) are arranged on the outer periphery of the upper end of the rotating shaft (41). The first bearing (5), the second bearing (6) and the bushing (7) are all located outside the anti-slip threads (411).

7. The motor for a noise-reducing hair dryer according to claim 2 or 3, characterized in that, A grounding terminal (9) is arranged at the lower end of the cylinder body (11). The lower end surface of the cylinder body (11) bulges downward to form the grounding terminal (9).

8. The motor for a noise-reducing hair dryer according to claim 2 or 3, characterized in that, A groove (111) is arranged at the lower end of the cylinder body (11). The grounding terminal (9) is arranged inside the groove (111).

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