Hair dryer

Abstract

The utility model provides an air blower which comprises a fan shell, a motor shell and a motor, the motor comprises a rotor assembly, a stator assembly and an impeller, the stator assembly comprises a stator iron core and a stator winding arranged on the stator iron core, the rotor assembly comprises a rotating shaft and a bearing arranged on the rotating shaft, the rotating shaft is connected with the impeller, the motor shell is arranged in an inner shell, and the motor shell is arranged in the inner shell. The motor shell comprises a bearing chamber section and a stator slot section which are connected with each other, the bearing is located in the bearing chamber section, and the stator assembly is located in the stator slot section; wherein the stator slot section is fixedly connected with the fan shell, and the outer diameter of the bearing chamber section is smaller than that of the stator slot section, so that the size of the motor shell is reduced. The problem that in the prior art, an air duct structure is arranged in a motor shell, so that the whole machine is too heavy is solved.

Description

Technical Field

[0001] The utility model relates to the field of household appliances, and more particularly to a hair dryer. Background Art

[0002] High-speed hair dryers are now increasingly favored by people, and the requirements for their quality are also getting higher and higher. In terms of user experience, not only high air volume and low noise need to be achieved, but also the whole machine is now required to be lightweight and miniaturized. However, the high-speed motors used in current high-speed hair dryers usually have an air duct system arranged in the motor housing. The motor housing includes an inner housing and an outer housing, and the air duct is formed between the inner housing and the outer housing. The motor is arranged in the inner housing. To ensure that the front and rear dimensions of the air duct are consistent, the outer wall of the inner housing and the inner wall of the outer housing are both arranged in a straight cylinder shape, that is, the outer diameter of the inner housing remains unchanged, while the inner diameter of the part of the inner housing that accommodates the motor stator is larger, and the inner diameter of the part of the inner housing that accommodates the rotor bearing is smaller. This makes the wall thickness of the part of the inner housing that accommodates the motor stator thinner, while the wall thickness of the part of the inner housing that accommodates the rotor bearing is thicker; moreover, since the distance between the fan blades of the high-speed motor and the inner wall of the outer housing is very small, the coaxiality requirement for the motor and the motor housing is relatively high. Therefore, the motor housing is usually made of metal materials, so that the part with a thicker wall thickness in the above-mentioned inner housing has a more significant impact on the overall weight increase of the motor housing, resulting in a heavier weight of the whole hair dryer. Summary of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a hair dryer to solve the problem of excessive weight of the whole machine due to the arrangement of the air duct structure in the motor housing in the existing technology.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] An embodiment of the present application provides a hair dryer, including: a fan housing, a motor housing, and a motor. The motor includes a rotor assembly, a stator assembly, and an impeller. The stator assembly includes a stator core and a stator winding arranged on the stator core. The rotor assembly includes a rotating shaft and a bearing arranged on the rotating shaft. The rotating shaft is connected to the impeller. The motor housing is arranged in the fan housing. The motor housing includes a bearing chamber section and a stator slot section that are connected to each other. The bearing is located in the bearing chamber section, and the stator assembly is located in the stator slot section; wherein, the stator slot section is fixedly connected to the fan housing, and the outer diameter of the bearing chamber section is smaller than the outer diameter of the stator slot section to reduce the volume of the motor housing.

[0006] Furthermore, heat dissipation holes are provided on the stepped end face between the bearing chamber section and the stator slot section. The heat dissipation holes communicate the inner cavity of the stator slot section and the outside of the motor housing to dissipate heat from the stator assembly.

[0007] Furthermore, the heat dissipation holes are arranged corresponding to the stator tooth parts or corresponding to the stator slots to dissipate heat from the stator winding.

[0008] Further, the heat dissipation holes are arranged as kidney-shaped holes, circular holes or polygonal holes; the number of the heat dissipation holes is consistent with the number of stator slots of the stator core.

[0009] Further, the outer walls of the bearing chamber section and the stator slot section are both straight cylindrical.

[0010] Further, the fan housing includes an outer shell and an inner shell disposed inside the outer shell, and an air duct is formed between the outer shell and the inner shell; the blades of the impeller are arranged corresponding to the air duct.

[0011] Further, a wind guide plate connecting the inner shell and the outer shell is provided in the air duct, and the inner shell, the outer shell and the wind guide plate form an integrally formed structure of metal material to improve the coaxiality of the motor and the outer shell.

[0012] Further, the outer shell is a plastic part, a metal cylindrical shell is fixed inside the outer shell, a wind guide plate connecting the metal cylindrical shell and the inner shell is provided in the air duct, and the metal cylindrical shell, the inner shell and the wind guide plate form an integrally formed structure of metal material to improve the coaxiality of the motor and the outer shell.

[0013] Further, a step is provided on the inner wall of the stator slot section, the stator core is disposed in the stator slot section and abuts against the step, the stator assembly further includes an insulating skeleton for insulating and isolating the stator winding; the distance between the outer diameter of the insulating skeleton and the outer diameter of the stator core is D1, the step has a width D2, and 1 / 3*D1 < D2 < D1.

[0014] Further, positioning columns are provided on the inner wall of the stator slot section, and one or more grooves are provided on the yoke of the stator core, and the positioning columns are engaged in the grooves to fix the stator core in the stator slot section, and the grooves are located at the positions of the yoke of the stator core corresponding to the stator tooth parts.

[0015] The beneficial effects of the embodiments of the present utility model are as follows:

[0016] 1. In this application, the outer diameter of the bearing chamber section of the motor housing is set to be smaller than the outer diameter of the stator slot section, so that the wall thicknesses of the bearing chamber section and the stator slot section of the motor housing are both thinner, reducing the weight of the motor housing and saving material costs.

[0017] 2. In an embodiment of this application, heat dissipation holes are provided on the stepped end face between the bearing chamber section and the stator slot section of the motor housing, and the wind driven by the operation of the impeller enters the stator slot section through the heat dissipation holes to cool the stator winding of the stator core, improving the heat dissipation efficiency. Thus, the volume of the motor stator can be reduced on the premise of ensuring the heat dissipation requirements, the motor power density can be increased, and both the motor and the motor housing supporting the motor are further miniaturized, thereby reducing the volume and weight of the motor and the motor housing.

[0018] 3. In an embodiment of the present application, by providing grooves in the yoke portion of the stator core and positioning posts in the stator slot section, and engaging the positioning posts in the grooves to further fix the stator core. On the one hand, it ensures the effective contact between the stator core and the stator slot section, preventing the stator core from shaking and generating noise. On the other hand, it ensures that the heat dissipation holes are aligned with the stator teeth or the upper and lower parts of the stator slot, so that the airflow entering from the heat dissipation holes impacts directly on the top of the stator winding and flows along both sides of the stator winding into the stator slot, or the airflow directly flows along the stator slot, improving the heat dissipation effect, reducing the heat passing through the stator core, being beneficial to increasing the power density of the motor, and further reducing the volume and weight of the entire motor.

[0019] 4. In an embodiment of the present application, by providing steps on the inner wall of the stator slot section, abutting the stator core against the steps, and setting a certain size relationship between the distance D1 between the outer diameter of the insulating skeleton and the outer diameter of the stator core and the width D2 of the steps, that is, 1 / 3 * D1 < D2 < D1, it further increases the contact area between the stator core and the stator slot section, reducing the generation of vibration and noise.

[0020] 5. In an embodiment of the present application, the blower housing includes an outer shell and an inner shell disposed within the outer shell. A wind channel is formed between the outer shell and the inner shell, and the blades of the impeller are arranged corresponding to the wind channel, directly using the blower housing to form a wind channel structure, saving materials and reducing weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application.

[0022] Figure 1 Schematic diagram of the structure of a hair dryer shown in an embodiment of the present application;

[0023] Figure 2 Schematic diagram of the internal structure of a hair dryer shown in an embodiment of the present application;

[0024] Figure 3 Schematic diagram of the structure of a motor shown in an embodiment of the present application;

[0025] Figure 4 Schematic diagram of the structure of a motor housing shown in an embodiment of the present application;

[0026] Figure 5 Exploded view of a hair dryer shown in an embodiment of the present application;

[0027] Figure 6 Schematic diagram of the structure of a bearing chamber section shown in an embodiment of the present application;

[0028] Figure 7 Schematic diagram of the structure of a heat dissipation hole shown in an embodiment of the present application;

[0029] Figure 8 Side view of the stator core shown in an embodiment of the present application;

[0030] Figure 9 Schematic structural diagram of the positioning post shown in an embodiment of the present application;

[0031] Figure 10 Schematic structural diagram of the stator core shown in an embodiment of the present application;

[0032] Figure 11 Schematic structural diagram of the metal cylindrical shell shown in an embodiment of the present application;

[0033] Figure 12 Side view of the hair dryer shown in an embodiment of the present application;

[0034] Figure 13 Schematic structural diagram of the step shown in an embodiment of the present application;

[0035] Figure 14 Schematic structural diagram of the insulating skeleton shown in an embodiment of the present application;

[0036] Figure 15 Schematic internal structure diagram of the customized slot section shown in an embodiment of the present application;

[0037] Figure 16 Cross-sectional view of the motor housing shown in an embodiment of the present application;

[0038] Figure 17 Schematic structural diagram of the boss shown in an embodiment of the present application.

[0039] Reference numerals: blower housing 1; outer housing 11; inner housing 12; boss 121; air duct 13; motor housing 2; bearing chamber section 21; stator slot section 22; positioning post 221; step 222; stepped end face 23; heat dissipation holes 24; motor 3; rotor assembly 31; rotating shaft 311; bearing 312; stator assembly 32; stator core 321; stator tooth portion 323; stator slot 324; insulating skeleton 325; groove 326; yoke portion 327; impeller 33; air guide plate 4; metal cylindrical shell 5; gap 6. Detailed Description of the Invention

[0040] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, terms such as "first" and "second" are only used for differential description and cannot be construed as indicating or implying relative importance.

[0041] The purpose of the present utility model is to provide a hair dryer to solve the problems in the prior art that a wind duct structure is arranged in the motor housing, and the volume of the motor housing is relatively large, resulting in an overweight and over-large whole machine.

[0042] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application.

[0043] See Figure 1 -5, the present application provides a hair dryer, including a blower housing 1, a motor housing 2, and a motor 3. Among them, the motor 3 includes a rotor assembly 31, a stator assembly 32, and an impeller 33. The stator assembly 32 includes a stator core 321 and a stator winding provided on the stator core 321. The rotor assembly 31 includes a rotating shaft 311 and a bearing 312 provided on the rotating shaft 311. The rotating shaft 311 is connected to the impeller 33. The stator winding is wound around each stator tooth portion 323 of the stator core 321, and a stator slot 324 is formed between adjacent stator tooth portions 323. Therefore, each stator slot 324 accommodates a stator winding. This is a conventional setting, and the stator winding is not shown in the drawings.

[0044] In the present application, the bearing chamber section 21 of the motor housing 2 is not used to form a wind duct structure. Therefore, the motor housing 2 only needs to meet the installation of the motor 3 through the change of the inner diameter, simplifying the structure of the motor housing 2. Its outer diameter does not need to remain unchanged to meet the structure of the wind duct 13, that is, the outer diameter of the motor housing 2 can be changed, so that the motor housing 2 does not have a part with a particularly large wall thickness, and the wall thickness of each part of the motor housing 2 is relatively thin, reducing the weight of the motor housing 2 and saving material costs, thereby improving the lightweight degree of the whole hair dryer. In the present application, the motor housing 2 is arranged inside the inner housing 12. The motor housing 2 includes a bearing chamber section 21 and a stator slot section 22 connected to each other. The bearing 312 is located in the bearing chamber section 21, and the stator assembly 32 is located in the stator slot section 22.

[0045] Specifically, in the present application, the stator slot section 22 is fixedly connected to the fan housing 1, and the outer diameter of the bearing chamber section 21 is smaller than the outer diameter of the stator slot section 22, so as to reduce the volume of the motor housing 2. The conventional high-speed motor is arranged in the inner shell of the motor housing with the air duct structure, the inner diameter of the stator slot section accommodating the motor stator in the inner shell is relatively large, and the inner diameter of the bearing chamber section accommodating the bearing in the inner shell is relatively small, and considering that the air duct formed between the inner shell and the outer shell needs to maintain the same size, the outer diameter of the inner shell remains unchanged, so that a solid structure with large radial thickness and axial thickness is formed between the inner wall and the outer wall of the bearing chamber section, that is, the wall thickness of the bearing chamber section is relatively large, which not only leads to the heavy weight of the motor housing as a whole, but also causes high material cost, especially when the motor housing is made of metal material to ensure the coaxiality of the motor and the motor housing, the above-mentioned adverse effects are more significant. The bearing chamber section 21 of the motor housing 2 of the present application is not used to form an air duct structure, so that the structure of the bearing chamber section 21 does not need to consider the formation of the air duct 13, so that based on the inner diameters of the bearing chamber section 21 and the stator slot section 22, the outer diameters of the bearing chamber section 21 and the stator slot section 22 are adaptively adjusted respectively, and the wall thickness of the bearing chamber section 21 is reduced, so that the wall thicknesses of the bearing chamber section 21 and the stator slot section 22 are both thinner, thereby reducing the volume of the motor housing 2, reducing the weight and material cost of the motor housing 2, and further improving the lightweight degree of the entire hair dryer.

[0046] It is understandable that the present application reduces the weight of the motor housing 2 and reduces the material cost by reducing the wall thickness of the motor housing 2. There is no limitation on the specific reduction of the outer wall of the bearing chamber section 21, as long as the maximum outer diameter of the bearing chamber section 21 is smaller than the maximum outer diameter of the stator slot section 22. In a preferred embodiment, the outer walls of the bearing chamber section 21 and the stator slot section 22 are both straight-cylindrical, which is convenient for processing and reduces production costs. The stator slot section 22 is installed on the inner wall of the inner shell 12 through the outer wall, with a large contact area and high stability after installation. Since the outer diameter of the bearing chamber section 21 is different from the outer diameter of the stator slot section 22, there is a stepped end face 23 between the bearing chamber section 21 and the stator slot section 22. In one embodiment, the thickness of the stepped end face 23 is set to between 1 mm and 4 mm, which ensures the strength of the bearing chamber section 21 and the corresponding stator slot section 22, and can further reduce the weight of the motor housing 2.

[0047] It should be noted that the bearing chamber section 21 of the motor housing 2 in the present application is not used to form an air duct structure, so that the outer diameter of the bearing chamber section 21 can be smaller than the outer diameter of the stator slot section 22, and the stator slot section 22 can still be used to form an air duct structure. Therefore, in some embodiments, an air duct is arranged outside the stator slot section 22, and an air guide plate is connected between the stator slot section 22 and the air duct, so as to form an air duct between the stator slot section and the air duct.

[0048] In an embodiment of the present application, the fan housing 1 includes an outer housing 11 and an inner housing 12 disposed inside the outer housing 11. A air duct 13 communicating with the outside air is formed between the outer housing 11 and the inner housing 12. The blades of the impeller 33 are disposed corresponding to the air duct 13. The air generated by the operation of the impeller 33 passes through this air duct 13. The motor 3 connected to the impeller 33 drives the impeller 33 to rotate for air intake, realizing the blowing of the impeller 33. By canceling the air cylinder on the traditional motor housing 2 and using the structural design of the fan housing 1 to form an air duct system, the fan housing 1 and the motor housing 2 are independent of each other. The assembly requirements for the motor are only satisfied by the motor housing 2, and the structural requirements for the air duct are only satisfied by the fan housing 1. Therefore, in an embodiment, both the inner housing 12 and the outer housing 11 of the fan housing 1 are in a straight cylinder structure to meet the structural setting of the air duct 13, and the inner diameter of the inner housing 12 does not need to be changed to meet the installation of the motor 3. Therefore, both the inner housing 12 and the outer housing 11 have a structure with an unchanged wall thickness, and both wall thicknesses are relatively thin, achieving lightweight.

[0049] See Figure 6 -10, the stator winding in the stator assembly 32 is the main heat-generating component. Therefore, to meet the heat dissipation requirements of the stator assembly 32, it is usually necessary to increase the volume of the stator assembly 32, that is, to reduce the power density of the motor, which is not conducive to miniaturization and lightweight. In an embodiment of the present application, since there is a difference in the outer diameter between the bearing chamber section 21 and the stator slot section 22, a stepped end face 23 is formed between the bearing chamber section 21 and the stator slot section 22. Heat dissipation holes 24 are provided on the stepped end face 23. The heat dissipation holes 24 communicate the inner cavity of the stator slot section 22 and the outside of the motor housing 2 to dissipate heat from the stator assembly 32, and the heat dissipation holes 24 are disposed corresponding to the stator teeth 323 of the stator core 321 or corresponding to the stator slots 324 to dissipate heat from the stator winding. Specifically, the hair dryer provided in this embodiment includes a motor 3, and the motor 3 is used to generate high-speed air flow. Therefore, in this embodiment, the heat dissipation holes 24 on the stepped end face 23 disposed between the bearing chamber section 21 and the stator slot section 22 can allow the high-speed air flow to flow through, so that the high-speed air flow enters the stator slot section 22 through the heat dissipation holes 24 to dissipate heat from the stator assembly 32, effectively improving the heat dissipation effect of the motor 3. In this way, the power density of the motor 3 can be improved, that is, the heat dissipation of the stator assembly 32 does not need to rely too much on increasing the volume of the stator assembly 32. On the premise of meeting the heat dissipation requirements by improving the heat dissipation effect through the heat dissipation holes 24, the volume of the stator assembly 32 can be reduced, the power density can be improved, the degree of miniaturization of the motor 3 can be improved, thereby further improving the degree of lightweight, reducing the weight of the motor 3 itself, and correspondingly, the sizes of the motor housing 2 and the inner housing 12 of the fan housing 1 are both reduced, further improving the lightweight degree of the whole hair dryer and saving material costs.

[0050] Specifically, in one embodiment, the heat dissipation holes 24 are arranged corresponding to the stator slots 324, such that the air flow is directly aligned with the stator slots 324 and flows through the side portions of the stator winding located within the stator slots 324 to dissipate heat from the stator winding. The fluidity of the air flow is good and the generated noise is small.

[0051] In another embodiment, the heat dissipation holes 24 are arranged corresponding to the stator teeth 323 such that the air flow impacts directly on the top of the winding, and thus flows along both sides of the stator winding towards the stator slots 324, enabling both the top and side portions of the stator winding to receive the impact of the air flow, resulting in better heat dissipation effect.

[0052] In some embodiments, the heat dissipation holes 24 are configured as kidney-shaped holes, circular holes or polygonal holes, and the number of the heat dissipation holes 24 is the same as the number of the stator slots 324 of the stator core 321.

[0053] The heat dissipation holes 24 are designed to be N in number, and the value of N depends on the number of the stator slots 324. In one embodiment of the present application, the number of the stator slots 324 can be set to 6, the number of the heat dissipation holes 24 can be set to 6, and after the stator core 321 is assembled into the stator slot section 22, the heat dissipation holes 24 are vertically aligned with the stator teeth 323, so that the air flow driven by the rotation of the impeller 33 enters the stator winding through the heat dissipation holes 24 for cooling, reducing the heat passing through the stator core 321, improving the heat dissipation of the motor 3, and at the same time, the outer diameter of the stator core 321 can be further reduced to a certain value, thereby improving the power density of the motor 3 and further reducing the weight of the motor 3.

[0054] To ensure the vertical alignment of the heat dissipation holes 24 and the stator teeth 323, in one implementation of the present application, positioning posts 221 are provided on the inner wall of the stator slot section 22, and one or more grooves 326 are provided on the yoke of the stator core 321. The positioning posts 221 are engaged in the grooves 326 to fix the stator core 321 within the stator slot section 22, and at the same time, glue can be added to further fix the stator core 321 and the motor housing 2.

[0055] Furthermore, in this embodiment, the grooves 326 are located at the positions of the yoke 327 of the stator core 321 corresponding to the stator teeth 323. The magnetic field distribution in the stator core is mainly concentrated in the stator teeth 323 and the part of the stator yoke 327 between adjacent stator teeth 323, and the magnetic field density of the part of the stator yoke 327 corresponding to the stator teeth 323 is small, that is, the magnetic field density passing through the stator core 321 at the grooves 326 is small. Therefore, grooves 326 are provided corresponding to the stator teeth 323 to cut the stator core 321, which has little impact on the performance of the motor 3.

[0056] In one embodiment, the positioning post 221 is provided as one, the number of the grooves 326 is set to three, and the grooves 326 are provided at positions close to the stator teeth 323.

[0057] See Figure 11 -12, the blower housing 1 includes an outer housing 11 and an inner housing 12. The outer housing 11 is used to support the entire hair dryer structure. In some embodiments, the material of the outer housing 11 can be set as a plastic part or a metal part. The clearance 6 between the outermost side of the blades of the impeller 33 and the inner ring of the outer housing 11 is controlled within the range of 0.05 mm to 0.15 mm. Controlling the clearance 6 within the above numerical range can generate a greater air volume, air speed and air pressure, and there will be no problems such as interference between the blades and the outer housing 11 or large operating noise of the motor 3 due to the too small clearance 6, or reduction of the air volume due to the too large clearance 6. Therefore, the coaxiality requirement for the motor 3 and the outer housing 11 is relatively high. To ensure the coaxiality, the present application provides the following two embodiments.

[0058] In one embodiment, a wind guide plate 4 connecting the inner housing 12 and the outer housing 11 is arranged in the air duct 13. The inner housing 12, the outer housing 11 and the wind guide plate 4 form an integrally formed structure of metal material to improve the coaxiality of the motor 3 and the outer housing 11.

[0059] In one embodiment, the outer housing 11 is a plastic part. In order to increase the air volume, a metal cylindrical shell 5 is fixed inside the outer housing 11. A wind guide plate 4 connecting the metal cylindrical shell 5 and the inner housing 12 is arranged in the air duct 13. The metal cylindrical shell 5, the inner housing 12 and the wind guide plate 4 form an integrally formed structure of metal material, which improves the coaxiality of the motor 3 and the outer housing 11.

[0060] In another embodiment, the outer housing 11 is a metal part. A wind guide plate 4 connecting the outer housing 11 and the inner housing 12 is arranged in the air duct 13. A wind duct 13 structure is formed between the outer housing 11, the inner housing 12 and the wind guide plate 4, which can ensure the concentricity of the motor 3, the outer housing 11 and the inner housing 12.

[0061] Among them, in some embodiments, the number of the wind guide plates 4 is set as an odd number such as 7 or 9, which can increase the resonance frequency, avoid the resonance band, reduce the resonance noise in a wide speed range, and at the same time reduce the wind resistance and increase the air volume.

[0062] See Figure 13 -16, in some embodiments, the inner edge of the stator slot section 22 for placing the stator core 321 is turned by machining to improve the accuracy of the inner wall, which can ensure the coaxiality after the stator core 321 is placed. A step 222 is arranged on the inner wall of the stator slot section 22. The stator core 321 is arranged in the stator slot section 22 and abuts against the step 222. The step 222 is used to limit the stator core 321, increase the contact area between the stator core 321 and the stator slot section 22, further fix the stator core 321, and reduce the problems of shaking and generating noise.

[0063] Further, in this embodiment, the stator assembly 32 further includes an insulating skeleton 325 for insulating and isolating the stator windings. The distance between the outer diameter of the insulating skeleton 325 and the outer diameter of the stator core 321 is D1, and the step 222 has a certain width D2, where 1 / 3 * D1 < D2 < D1, which can further ensure the contact surface between the stator core 321 and the motor housing 2, and reduce the vibration and noise generated by the motor 3.

[0064] To further reduce noise, in some embodiments, the stator slot section 22 is assembled in the inner housing 12 by interference fit or clearance fit and fixed by glue bonding, which can ensure the coaxiality of the motor 3 and tight fixation, and further reduce the vibration and noise generated during the operation of the motor 3.

[0065] See Figure 17 , in some embodiments, a boss 121 is further provided in the inner housing 12, and the motor housing 2 abuts against the boss 121 for axially limiting the motor housing 2.

[0066] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0067] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0068] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hair dryer, comprising: A fan housing, a motor housing, and a motor. The motor includes a rotor assembly, a stator assembly, and an impeller. The stator assembly includes a stator core and a stator winding provided on the stator core. The rotor assembly includes a rotating shaft and a bearing provided on the rotating shaft. The rotating shaft is connected to the impeller. It is characterized in that, The motor housing is disposed within the fan housing. The motor housing includes a bearing chamber section and a stator slot section that are connected to each other. The bearing is located within the bearing chamber section, and the stator assembly is located within the stator slot section; Wherein, the stator slot section is fixedly connected to the fan housing. The outer diameter of the bearing chamber section is smaller than the outer diameter of the stator slot section to reduce the volume of the motor housing.

2. The hair dryer according to claim 1, characterized in that, Heat dissipation holes are provided on the stepped end face between the bearing chamber section and the stator slot section. The heat dissipation holes communicate the inner cavity of the stator slot section and the outside of the motor housing to dissipate heat from the stator assembly.

3. The hair dryer according to claim 2, characterized in that, The heat dissipation holes are provided corresponding to the stator tooth portions or corresponding to the stator slots to dissipate heat from the stator winding.

4. The hair dryer according to claim 2, wherein The heat dissipation holes are provided as kidney-shaped holes, circular holes, or polygonal holes; The number of the heat dissipation holes is consistent with the number of stator slots of the stator core.

5. The hair dryer according to claim 1, characterized in that, The outer walls of the bearing chamber section and the stator slot section are both straight cylindrical.

6. The hair dryer according to any one of claims 1 to 5, characterized in that, The fan housing includes an outer shell and an inner shell provided within the outer shell. An air duct is formed between the outer shell and the inner shell; The blades of the impeller are provided corresponding to the air duct.

7. The hair dryer according to claim 6, characterized in that, A wind guide plate connecting the inner shell and the outer shell is provided within the air duct. The inner shell, the outer shell, and the wind guide plate form a metal material integrally formed structure to improve the coaxiality of the motor and the outer shell.

8. The hair dryer according to claim 6, characterized in that, The outer shell is a plastic part. A metal cylindrical shell is fixed within the outer shell. A wind guide plate connecting the metal cylindrical shell and the inner shell is provided within the air duct. The metal cylindrical shell, the inner shell, and the wind guide plate form a metal material integrally formed structure to improve the coaxiality of the motor and the outer shell.

9. The hair dryer according to claim 1, characterized in that, Steps are provided on the inner wall of the stator slot section. The stator core is disposed within the stator slot section and abuts against the steps. The stator assembly further includes an insulating skeleton for insulating and isolating the stator winding; The distance between the outer diameter of the insulating skeleton and the outer diameter of the stator core is D1. The step has a width D2, and 1 / 3 * D1 < D2 < D1.

10. The hair dryer according to claim 3, characterized in that, Positioning posts are provided on the inner wall of the stator slot section. One or more grooves are provided on the yoke portion of the stator core. The positioning posts are engaged within the grooves to fix the stator core within the stator slot section. The grooves are located at the positions of the yoke portion of the stator core corresponding to the stator tooth portions.

Images