Low-noise high-speed motor and blower with same

Abstract

The invention discloses a low-noise high-speed motor and a blower with the same. The low-noise high-speed motor comprises a shaft core, a shell assembly, a fan assembly, a driving mechanism and a limiting mechanism. A fan assembly, a limiting mechanism and a driving mechanism are sequentially arranged in the shell assembly from top to bottom. The top of the shaft core is fixedly connected with the fan assembly, the driving mechanism and the limiting mechanism are arranged on the outer side of the bottom of the shaft core in a sleeving mode, the driving assembly is in power connection with the shaft core, and the driving assembly is used for limiting the movement direction of the shaft core. The fan assembly sucks air on the outer side of the shell assembly through rotation of turbine blades and transmits the air to the interior of the shell assembly through the air.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dryer motors, and in particular to a low-noise high-speed motor and a hair dryer having the same. Background Art

[0002] Hair dryers are essential personal care appliances in modern people's lives. When using a hair dryer to dry hair, strong wind force and appropriate temperature are what everyone cares about first. In order to pursue large air volume and high wind speed, an existing high-speed motor structure often includes a stator assembly, a limit assembly and a fan. The motor uses the air flow channel on the periphery of the air duct barrel to supply air. The air flow in the air duct does not pass through the stator and shaft core of the motor, etc., which can reduce the noise when the hair dryer is running.

[0003] Chinese patent 202323060527.7 discloses an improved low-noise high-speed motor structure for a hair dryer. A first gasket and a second gasket are arranged on the end faces at the front and rear ends of the second installation chamber. The gasket structure can maintain the stability of the stator assembly and fan blades at the front and rear ends of the second installation chamber, reduce the jitter and shaking of the operation of the two, and thus effectively improve the stability of the high-speed fan under high-speed operation.

[0004] However, this type of hair dryer needs to reach a relatively high speed when in operation. Under high-speed industrial control, this type of fan and the improved gasket structure will produce high-frequency friction, which increases the noise of the device and easily causes wear of the device.

[0005] Therefore, it is proposed to propose a low-noise high-speed motor and a hair dryer having the same which can achieve the required air intake volume by improving the fan structure, thereby reducing the motor speed. Summary of the invention

[0006] The object of the present invention is to provide a low-noise high-speed motor and a hair dryer having the same to solve the technical problem of excessive noise during the rotation of the existing high-speed motor.

[0007] To achieve the above object, the present invention provides the following technical solutions: A low-noise high-speed motor comprises a shaft core, a shell assembly, a fan assembly, a driving mechanism and a limiting mechanism; the fan assembly, the limiting mechanism and the driving mechanism are arranged in sequence from top to bottom in the shell assembly; the fan assembly is fixedly connected to the top of the shaft core, the driving mechanism and the limiting mechanism are sleeved on the outside of the bottom of the shaft core, the driving assembly is dynamically connected to the shaft core, the driving assembly is used to limit the movement direction of the shaft core, and the fan assembly inhales air from the outside of the shell assembly through the rotation of turbine blades and transmits the air to the inside of the shell assembly through the air.

[0008] Furthermore, the fan assembly includes a support plate, a central axis, a fixed plate, a turbine plate, a separator, and an air inlet; the support plate is fixedly installed on the top of the shaft core, the central axis is fixedly connected to the middle of the support plate, the fixed plate is distributed in an array along the side wall of the central axis along the central axis core, the turbine plate is fixedly connected to the side of the fixed plate away from the central axis, the separator is fixedly connected to the end of the turbine plate away from the central axis, an air inlet cavity is formed between two adjacent fixedly connected fixed plates, turbine plates and separators, the horizontal cross-section of the air inlet cavity increases successively from top to bottom, the air inlet is opened between adjacent separators, the air inlet passes through the support plate, and the outside air passes through the fixed plate, turbine plate and separator in turn, and then enters the bottom of the support plate through the air inlet.

[0009] Furthermore, the shell assembly includes an umbrella-shaped cover plate, a connecting ring, a filter screen, a sealing plate and a cylindrical shell; the top of the cylindrical shell is connected to the umbrella-shaped cover plate, and the maximum cross-section of the umbrella-shaped cover plate is fixedly connected to the top of the cylindrical shell, the connecting ring is fixedly installed on the side of the umbrella-shaped cover plate away from the cylindrical shell, the connecting ring is fixedly connected to the filter screen, and the cylindrical shell is fixed to the middle of the filter screen; the fan assembly is movably connected to the connecting ring, the cylindrical shell is arranged corresponding to the central axis, the inner and outer diameters of the filter screen are arranged corresponding to the inner and outer diameters of the fixing plate, and the outer diameter of the support plate is smaller than the maximum inner diameter of the connecting ring; when the fan assembly is assembled into the interior of the connecting ring, the filter screen and the fixing plate cooperate so that the outside air can only enter the interior of the shell assembly through the air inlet cavity between adjacent fixing plates, and since the horizontal cross-section of the air inlet cavity increases successively from top to bottom, the outside air is drawn into the interior of the fan assembly by the pressure difference, thereby realizing air multiplication.

[0010] Furthermore, the driving mechanism includes a driving shell and a stator coil; the middle part of the cylindrical shell is fixedly connected to the limiting shell by a connecting rod, the bottom end of the limiting shell is fixedly connected to the driving shell, the stator coil is symmetrically arranged inside the driving shell, the shaft core is passed through the stator coils at both ends, and the stator coil drives the shaft core to rotate at high speed, thereby driving the support plate to rotate.

[0011] Furthermore, the inner diameter of the limiting shell is larger than the inner diameter of the driving shell, the distance from the limiting shell to the center of the shaft core is smaller than the distance from the air inlet to the center of the shaft core, the outside air enters between the limiting shell and the cylindrical shell through the air inlet, and then enters between the driving shell and the cylindrical shell, and the limiting mechanism is arranged in the limiting shell.

[0012] Furthermore, the limiting mechanism includes a fixed component and a sliding component, and the fixed component includes a fixed sleeve, a connecting sleeve, a fastener, and a fixed ball; the fixing sleeve is movably connected to the top of the limiting shell, and the fixed ball is correspondingly arranged at the bottom of the fixing sleeve, and a plurality of connecting sleeves are rotatably arranged between the fixing sleeve and the fixed ball, and the connecting sleeves are distributed in an array with the center of the shaft core as the rotation center, and the end of the connecting sleeve away from the limiting shell is against the shaft core, and a plurality of connecting sleeves are jointly against the shaft core, and the fixing sleeve and the fixed ball are fixed by the fastener, and the fastener fixes the fixing sleeve by bolts, and the relative positions of the limiting shell and the fixed ball, and a plurality of connecting sleeves that limit the rotation of the shaft core are arranged inside the limiting shell.

[0013] Furthermore, the sliding assembly includes a trapezoidal cover, a sliding ball, a wave spring and a limit cover; the bottom end of the trapezoidal cover is slidably adapted to the drive shell, the top end of the trapezoidal cover is slidably adapted to the limit shell, the trapezoidal cover and the limit cover are integrally formed, a plurality of sliding balls are rotatably arranged between the trapezoidal cover and the limit cover, the plurality of sliding balls jointly abut against the shaft core, the wave spring is also connected between the limit cover and the fixed ball, the wave spring is used to apply a pre-tightening axial force to the shaft core, and the trapezoidal cover blocks the shaft core from driving the trapezoidal cover to slide downward.

[0014] Furthermore, a rotating ring is provided on the top of the fixing sleeve, the rubber ring is fixedly installed on the side wall of the cylindrical shell, the rubber gasket is installed on the inner bottom wall of the driving shell, the support plate is provided with an air inlet corresponding to the rubber ring, the air inlet is rotatably arranged inside the rubber ring, the support plate is provided with the sliding end corresponding to the rotating ring, the sliding end is rotatably arranged inside the rotating ring, the bottom of the shaft core abuts against the rubber gasket, and the rotating ring, the rubber ring and the rubber gasket are all used to reduce the movement friction between the shaft core and the support plate.

[0015] Furthermore, a through hole is provided in the inner bottom wall of the driving shell, a blocking block is connected to the bottom of the shaft core, the blocking block is rotatably set on the inner wall of the through hole through the rotating key, the air inlet hole is provided on the side of the top of the connecting rod close to the limit shell, the limiting shell is correspondingly provided with the connecting hole, the trapezoidal cover is correspondingly provided with the fixing hole, the shaft core is correspondingly provided with the rotating hole, the rotating hole is set as a T-slot, the air inlet hole, the connecting hole and the fixing hole are connected, the shaft core rotates to the rotating hole and is connected to the fixed hole, and the outside air is output through the air inlet hole, the connecting hole, the fixing hole and the rotating hole in sequence.

[0016] The beneficial effects of the present invention are: 1. The present invention adopts the structural design of the shell assembly and the fan assembly so that the outside air passes through the fixing plate, the turbine plate and the partition plate in sequence, then enters the bottom of the support plate through the air inlet, then passes between the cylindrical shell and the limiting shell, between the cylindrical shell and the driving shell, and finally is output through the blower; in this process, since the horizontal cross-section of the air inlet channel increases from top to bottom, the outside air is drawn into the fan assembly by the pressure difference, realizing air multiplication, so that the motor speed is reduced, the efficiency is increased, and the noise is reduced when the amount of air blown out remains unchanged.

[0017] 2. The present invention provides the rotating ring, the rubber ring and the rubber gasket, which are used to reduce the movement friction between the shaft core and the support, thereby reducing noise.

[0018] 3. The present invention sets a plurality of connecting sleeves to abut against the shaft core together, the fixing sleeve and the fixing ball are fixed by the fastener, the fastener fixes the fixing sleeve by bolts, the relative positions of the limiting shell and the fixing ball, and a plurality of connecting sleeves are set inside the limiting shell to limit the rotation of the shaft core; then through the wave spring and the trapezoidal cover, the wave spring is used to apply a pre-tightening axial force to the shaft core, and the trapezoidal cover blocks the shaft core and drives the trapezoidal cover to slide downward, so as to realize the axial limitation of the shaft core.

[0019] 4. The present invention realizes heat dissipation for the shaft core and further reduces the noise of the device by setting a heat dissipation channel through which the outside air is output in sequence through the air inlet hole, the connecting hole, the fixing hole and the rotating hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional structural schematic diagram of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of the present invention after removing the rotating shaft; Figure 3 It is a schematic diagram of the structure of the present invention after removing the housing assembly; Figure 4 It is a schematic diagram of the structure of the present invention after removing the driving mechanism and the limiting mechanism; Figure 5 It is a schematic diagram of the top view of the structure of the present invention; Figure 6 is a schematic structural diagram of a fan assembly of the present invention; Figure 7 is a schematic diagram of the top view of the fan assembly of the present invention; Figure 8 It is a schematic diagram of the structure of the fixing assembly of the present invention; Fig. 9 It is a schematic diagram of the wave spring structure of the present invention.

[0021] Description of reference numerals in the figures: 11. Umbrella-shaped cover plate; 12. Connecting ring; 13. Filter screen; 14. Closing plate; 15. Cylindrical shell; 16. Connecting rod; 17. Axis core; 18. Rotating key; 19. Blocking block; 21. Driving shell; 22. Stator coil; 23. Rubber gasket; 31. Support plate; 32. Center axis; 33. Fixed plate; 34. Turbine plate; 35. Separator; 36. Air inlet; 37. Rotating end; 38. Sliding end; 41. Limiting shell; 51. Fixed sleeve; 52. Connecting sleeve; 53. Fastener; 54. Fixed ball; 55. Rotating ring; 61. Trapezoidal cover; 62. Sliding ball; 63. Wave spring; 64. Limiting cover; 71. Rubber ring; 81. Air inlet; 82. Connecting hole; 83. Fixed hole; 84. Rotating hole. DETAILED DESCRIPTION

[0022] Embodiment 1: Please refer to 1-9; A low-noise high-speed motor, characterized in that it includes a shaft core 17, a shell assembly, a fan assembly, a driving mechanism and a limiting mechanism; the fan assembly, the limiting mechanism and the driving mechanism are arranged in sequence from top to bottom in the shell assembly; the fan assembly is fixedly connected to the top of the shaft core 17, the driving mechanism and the limiting mechanism are sleeved on the outside of the bottom of the shaft core 17, the driving assembly is dynamically connected to the shaft core 17, the driving assembly is used to limit the movement direction of the shaft core 17, and the fan assembly inhales air from the outside of the shell assembly through the rotation of turbine blades and transmits the air to the inside of the shell assembly through the air.

[0023] As a further solution of this embodiment, the fan assembly includes a support plate 31, a central axis 32, a fixing plate 33, a turbine plate 34, a separator 35, and an air inlet 36; the support plate 31 is fixedly installed on the top of the shaft core 17, the central axis 32 is fixedly connected to the middle of the support plate 31, the fixing plate 33 is distributed along the side wall of the central axis 32 along the axis core array of the central axis 32, the turbine plate 34 is fixedly connected to the side of the fixing plate 33 away from the central axis 32, and the separator 35 is fixedly connected to the end of the turbine plate 34 away from the central axis 32. An air inlet cavity is formed between two adjacent fixedly connected fixing plates 33, turbine plates 34 and separator plates 35, and the horizontal cross-section of the air inlet cavity increases from top to bottom. The air inlet 36 is opened between adjacent separator plates 35, and the air inlet 36 passes through the support plate 31. The outside air passes through the fixing plate 33, turbine plates 34 and separator plates 35 in turn, and then enters the bottom of the support plate 31 through the air inlet 36.

[0024] As a further solution of this embodiment, the housing assembly includes an umbrella-shaped cover plate 11, a connecting ring 12, a filter screen 13, a sealing plate 14 and a cylindrical shell 15; the top of the cylindrical shell 15 is connected to the umbrella-shaped cover plate 11, and the maximum cross-section of the umbrella-shaped cover plate 11 is fixedly connected to the top of the cylindrical shell 15, the connecting ring 12 is fixedly installed on the side of the umbrella-shaped cover plate 11 away from the cylindrical shell 15, the connecting ring 12 is fixedly connected to the filter screen 13, and the cylindrical shell 15 is fixed in the middle of the filter screen 13; the fan assembly is movably connected to the connecting ring 11 2. The cylindrical shell 15 is arranged corresponding to the central axis 32, the inner and outer diameters of the filter screen 13 are arranged corresponding to the inner and outer diameters of the fixing plate 33, and the outer diameter of the support plate 31 is smaller than the maximum inner diameter of the connecting ring 12; when the fan assembly is assembled into the connecting ring 12, the filter screen 13 and the fixing plate 33 cooperate so that the outside air can only enter the inside of the shell assembly through the air inlet cavity between the adjacent fixing plates 33. Since the horizontal cross-section of the air inlet cavity increases from top to bottom, the outside air is drawn into the inside of the fan assembly by the pressure difference, thereby realizing air multiplication.

[0025] Embodiment 2: Based on the first embodiment, we further improved the limit assembly. Among them, the driving mechanism includes a driving shell 21 and a stator coil 22; the middle part of the cylindrical shell 15 is fixedly connected to the limiting shell 41 through a connecting rod 16, the bottom end of the limiting shell 41 is fixedly connected to the driving shell 21, and the stator coil 22 is symmetrically arranged inside the driving shell 21, and the shaft core 17 is passed through the stator coils 22 at both ends. The stator coil 22 drives the shaft core 17 to rotate at high speed, thereby driving the support plate 31 to rotate.

[0026] As a further solution of this embodiment, the inner diameter of the limiting shell 41 is larger than the inner diameter of the driving shell 21, and the distance from the limiting shell 41 to the center of the shaft core 17 is smaller than the distance from the air inlet 36 to the center of the shaft core 17. The outside air enters between the limiting shell 41 and the cylindrical shell 15 through the air inlet 36, and then enters between the driving shell 21 and the cylindrical shell 15. The limiting mechanism is arranged in the limiting shell 41.

[0027] As a further solution of this embodiment, the limiting mechanism includes a fixing component and a sliding component, and the fixing component includes a fixing sleeve 51, a connecting sleeve 52, a fastener 53, and a fixed ball 54; the fixing sleeve 51 is movably sleeved on the top of the limiting shell 41, and the fixed ball 54 is correspondingly arranged at the bottom of the fixing sleeve 51, and a plurality of connecting sleeves 52 are rotatably arranged between the fixing sleeve 51 and the fixed ball 54, and the connecting sleeves 52 are distributed in an array with the center of the shaft core 17 as the rotation center, and one end of the connecting sleeve 52 away from the limiting shell 41 is against the shaft core 17, and a plurality of connecting sleeves 52 are jointly against the shaft core 17, and the fixing sleeve 51 and the fixed ball 54 are fixed by the fastener 53, and the fastener 53 fixes the fixing sleeve 51 by bolts, the relative positions of the limiting shell 41 and the fixed ball 54, and a plurality of connecting sleeves 52 that limit the rotation of the shaft core 17 are arranged inside the limiting shell 41.

[0028] As a further solution of this embodiment, the sliding assembly includes a trapezoidal cover 61, a sliding ball 62, a wave spring 63 and a limit cover 64; the bottom end of the trapezoidal cover 61 is slidably adapted to the drive shell 21, and the top end of the trapezoidal cover 61 is slidably adapted to the limit shell 41. The trapezoidal cover 61 and the limit cover 64 are arranged by integral molding. A plurality of sliding balls 62 are rotatably arranged between the trapezoidal cover 61 and the limit cover 64, and the plurality of sliding balls 62 jointly abut against the shaft core 17. The wave spring 63 is also connected between the limit cover 64 and the fixed ball 54, and the wave spring 63 is used to apply a pre-tightening axial force to the shaft core 17. The trapezoidal cover 61 blocks the shaft core 17 from driving the trapezoidal cover 61 to slide downward, thereby realizing axial limitation of the shaft core 17.

[0029] As a further solution of this embodiment, a rotating ring 55 is provided at the top of the fixing sleeve 51, the rubber ring 71 is fixedly installed on the side wall of the cylindrical shell 15, the rubber gasket 23 is installed on the inner bottom wall of the driving shell 21, the support plate 31 is provided with an air inlet 36 corresponding to the rubber ring 71, and the air inlet 36 is rotatably arranged inside the rubber ring 71, the support plate 31 is provided with the sliding end 38 corresponding to the rotating ring 55, and the sliding end 38 is rotatably arranged inside the rotating ring 55, the bottom of the shaft core 17 abuts against the rubber gasket 23, and the rotating ring 55, the rubber ring 71 and the rubber gasket 23 are all used to reduce the movement friction between the shaft core 17 and the support plate 31, thereby reducing noise.

[0030] Embodiment three; On the basis of the second embodiment, we further set up a shaft core heat dissipation structure. The inner bottom wall of the driving housing 21 is provided with a through hole, and the bottom of the shaft core 17 is connected with a blocking block 19, and the blocking block 19 is rotatably arranged on the inner wall of the through hole through the rotating key 18. The top of the connecting rod 16 is provided with the air inlet 81 on one side close to the limiting shell 41, the limiting shell 41 is provided with the connecting hole 82, the trapezoidal cover 61 is provided with the fixing hole 83, the shaft core 17 is provided with the rotating hole 84, the rotating hole 84 is configured as a T-slot, the air inlet 81, the connecting hole 82 and the fixing hole 83 are connected, the shaft core 17 is rotated to the rotating hole 84 and connected to the fixing hole 83, and the outside air is outputted through the air inlet 81, the connecting hole 82, the fixing hole 83 and the rotating hole 84 in sequence. This realizes heat dissipation for the shaft core 17 and further reduces the noise of the device. Embodiment 4: A hair dryer comprises the low-noise high-speed motor.

Claims

1. A low-noise high-speed motor, characterized in that: It includes an axis core, a shell assembly, a fan assembly, a driving mechanism and a limiting mechanism; the fan assembly, the limiting mechanism and the driving mechanism are arranged in the shell assembly from top to bottom in sequence; the fan assembly is fixedly connected to the top of the axis core, the driving mechanism and the limiting mechanism are sleeved on the outside of the bottom of the axis core, the driving assembly is dynamically connected to the axis core, the driving assembly is used to limit the movement direction of the axis core, and the fan assembly inhales the air outside the shell assembly through the rotation of turbine blades and transmits it to the inside of the shell assembly through the air.

2. A low-noise high-speed motor according to claim 1, characterized in that: The fan assembly includes a support plate, a central shaft, a fixing plate, a turbine plate, a separator plate, and an air inlet; The support plate is fixedly installed on the top of the shaft core, the central shaft is fixedly connected to the middle of the support plate, the fixing plates are distributed in an array along the central shaft core on the side wall of the central shaft, the turbine plate is fixedly connected to the side of the fixing plate away from the central shaft, the separator is fixedly connected to the end of the turbine plate away from the central shaft, an air intake cavity is formed between two adjacent fixedly connected fixing plates, turbine plates and separator plates, the horizontal cross-section of the air intake cavity increases successively from top to bottom, and air inlets are provided between adjacent separator plates, the air inlets penetrate the support plate, and the outside air passes through the fixing plate, turbine plate and separator plate in turn, and then enters the bottom of the support plate through the air inlet.

3. A low-noise high-speed motor according to claim 2, characterized in that: The housing assembly comprises an umbrella-shaped cover plate, a connecting ring, a filter screen, a sealing plate and a cylindrical shell; The top of the cylindrical shell is connected to the umbrella-shaped cover plate, and the largest cross-section of the umbrella-shaped cover plate is fixedly connected to the top of the cylindrical shell. The connecting ring is fixedly installed on the side of the umbrella-shaped cover plate away from the cylindrical shell, the connecting ring is fixedly connected to the filter screen, and the cylindrical shell is fixed in the middle of the filter screen; The fan assembly is movably connected to the connecting ring, the cylindrical shell is arranged corresponding to the central axis, the inner and outer diameters of the filter screen are arranged corresponding to the inner and outer diameters of the fixing plate, and the outer diameter of the support plate is smaller than the maximum inner diameter of the connecting ring; When the fan assembly is assembled into the connecting ring, the filter screen and the fixing plate cooperate so that outside air can only enter the shell assembly through the air intake cavity between adjacent fixing plates. Since the horizontal cross-section of the air intake cavity increases from top to bottom, outside air is drawn into the fan assembly by the pressure difference, thereby achieving air multiplication.

4. A low-noise high-speed motor according to claim 3, characterized in that: The driving mechanism comprises a driving housing and a stator coil; The middle part of the cylindrical shell is fixedly connected to the limiting shell by a connecting rod, the bottom end of the limiting shell is fixedly connected to the driving shell, the stator coils are symmetrically arranged inside the driving shell, the shaft core is passed through the stator coils at both ends, and the stator coil drives the shaft core to rotate at high speed, thereby driving the support plate to rotate.

5. A low-noise high-speed motor according to claim 4, characterized in that: The inner diameter of the limiting shell is larger than the inner diameter of the driving shell, the distance from the limiting shell to the center of the shaft core is smaller than the distance from the air inlet to the center of the shaft core, the outside air enters between the limiting shell and the cylindrical shell through the air inlet, and then enters between the driving shell and the cylindrical shell, and the limiting mechanism is arranged in the limiting shell.

6. A low-noise high-speed motor according to claim 5, characterized in that: The limiting mechanism includes a fixed component and a sliding component. The fixing assembly includes a fixing sleeve, a connecting sleeve, a fastener, and a fixing ball; The fixing sleeve is movably connected to the top of the limiting shell, and the fixing ball is correspondingly arranged at the bottom of the fixing sleeve. A plurality of connecting sleeves are rotatably arranged between the fixing sleeve and the fixing ball. The connecting sleeves are distributed in an array with the center of the shaft core as the rotation center, and the end of the connecting sleeve away from the limiting shell is against the shaft core, and a plurality of connecting sleeves are jointly against the shaft core. The fixing sleeve and the fixing ball are fixed by the fastener, and the fastener fixes the fixing sleeve by bolts. The relative positions of the limiting shell and the fixing ball, and a plurality of connecting sleeves are arranged inside the limiting shell to limit the rotation of the shaft core.

7. A low-noise high-speed motor according to claim 6, characterized in that: The sliding assembly includes a trapezoidal cover, a sliding ball, a wave spring and a limit cover; The bottom end of the trapezoidal cover is slidably adapted to the driving shell, and the top end of the trapezoidal cover is slidably adapted to the limiting shell. The trapezoidal cover and the limiting cover are integrally formed, and a plurality of sliding balls are rotatably arranged between the trapezoidal cover and the limiting cover. The plurality of sliding balls abut against the shaft core together. The wave spring is also connected between the limiting cover and the fixed ball, and the wave spring is used to apply a pre-tightening axial force to the shaft core. The trapezoidal cover blocks the shaft core from driving the trapezoidal cover to slide downward.

8. A low-noise high-speed motor according to claim 7, characterized in that: A rotating ring is provided at the top of the fixed sleeve, the rubber ring is fixedly mounted on the side wall of the cylindrical shell, the rubber gasket is mounted on the inner bottom wall of the driving shell, the support plate is provided with an air inlet corresponding to the rubber ring, the air inlet is rotatably arranged inside the rubber ring, the support plate is provided with the sliding end corresponding to the rotating ring, the sliding end is rotatably arranged inside the rotating ring, the bottom of the shaft core abuts against the rubber gasket, and the rotating ring, the rubber ring and the rubber gasket are all used to reduce the movement friction between the shaft core and the support plate.

9. A low-noise high-speed motor according to claim 6, characterized in that: The inner bottom wall of the driving housing is provided with a through hole, and a blocking block is connected to the bottom of the shaft core. The blocking block is rotatably arranged on the inner wall of the through hole through the rotating key. The air inlet is provided on one side of the top of the connecting rod close to the limiting shell, the connecting hole is correspondingly provided on the limiting shell, the fixing hole is correspondingly provided in the trapezoidal cover, the rotating hole is correspondingly provided on the shaft core, the rotating hole is configured as a T-slot, the air inlet, the connecting hole and the fixing hole are connected, the shaft core rotates to the rotating hole to be connected to the fixing hole, and the outside air is outputted through the air inlet, the connecting hole, the fixing hole and the rotating hole in sequence.

10. A hair dryer, characterized in that: A low-noise high-speed motor comprising any one of claims 1-9.

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