Hair dryer

Abstract

The utility model relates to a hair drier, which comprises a casing extending along the axial direction, and a motor and a fan accommodated in the casing, the casing comprises an air inlet, an air outlet, an air flow channel positioned between the air inlet and the air outlet and an accommodating casing positioned in the air flow channel, and the motor is positioned in the accommodating casing and comprises a rotating shaft extending out of the accommodating casing. The fan comprises a hub connected to the rotating shaft, a gap is formed between the hub and the containing shell in the axial direction, the hub comprises a plurality of through holes communicated with the airflow channel and the gap, the containing shell comprises an air outlet communicated with fluid in the gap, and a cooling channel for cooling the motor is formed among the through holes, the gap and the air outlet. The airflow direction in the cooling channel is the same as that in the airflow channel; at least one of the accommodating shell and the fan is provided with an extension rib extending into the gap, and the extension rib extends in the axial direction to isolate the gap from the airflow channel, so that the cooling effect of the motor is improved, and the blowing efficiency is enhanced.

Description

Technical Field

[0001] This utility model relates to a hair dryer, and more particularly to a hair dryer that can improve the cooling effect of the motor while improving the blowing efficiency. Background Technology

[0002] A hair dryer consists of a housing, a duct housed within the housing, a motor located within the duct, and a fan driven by the motor. During operation, air is drawn into the duct through the inlet and then blown out through the outlet, thus dispersing fallen leaves or dust to a specific location. However, after the motor rotates at high speed for a certain period, its temperature will also rise. If the motor is exposed to high temperatures for an extended period, its lifespan will be significantly reduced, and in severe cases, it may even lead to motor damage.

[0003] To address the issue of motor heat dissipation, current hair dryers typically have through holes in the guide cone located within the duct. By using air pressure difference, some airflow is guided into the guide cone to dissipate heat from the motor. However, heat dissipation through airflow recirculation is insufficient for existing high-power motors, and the flow direction of the heat dissipation airflow is opposite to that of the main airflow within the duct, which also reduces the overall blowing efficiency of the machine.

[0004] Therefore, it is indeed necessary to provide an improved hair dryer to overcome the shortcomings of the existing technology. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hair dryer that can improve the cooling effect of the motor while improving the blowing efficiency.

[0006] The present invention can solve the existing technical problems by adopting the following technical solution:

[0007] A hair dryer includes an axially extending housing, a motor and a fan housed within the housing. The housing includes an air inlet, an air outlet, an airflow channel between the air inlet and the air outlet, and a receiving outer shell located within the airflow channel. The motor is located within the receiving outer shell and includes a rotating shaft extending out of the receiving outer shell. The fan includes a hub connected to the rotating shaft. The hub and the receiving outer shell are axially spaced apart by a gap. The hub includes a plurality of through holes communicating with the airflow channel and the gap. The receiving outer shell includes an air outlet in fluid communication with the gap. The through holes, the gap, and the air outlet form a cooling channel for cooling the motor. The airflow direction in the cooling channel is the same as the airflow direction in the airflow channel. At least one of the receiving outer shell and the fan is provided with an extension rib extending into the gap. The extension rib extends axially to isolate the gap from the airflow channel.

[0008] A further improvement is that the extension rib completely covers the gap in the radial direction perpendicular to the axial direction to isolate the gap from the airflow channel.

[0009] A further improvement is that the extension rib extends from the housing towards the hub, and the radial dimension of the extension rib is greater than the radial dimension of the hub.

[0010] A further improvement is that the extension rib extends from the hub toward the housing, and the radial dimension of the extension rib is greater than the radial dimension of the housing.

[0011] A further improvement is that the extension rib includes a first extension rib extending from the wheel hub toward the housing shell and a second extension rib extending from the housing shell toward the wheel hub.

[0012] A further improvement is that the first extension rib and the second extension rib extend toward each other and at least partially overlap in the axial direction, thereby completely covering the gap in the radial direction.

[0013] A further improvement is that the radial dimension of the first extension rib is greater than the radial dimension of the second extension rib.

[0014] A further improvement is as follows: several through holes extend through the hub axially, the housing includes an air inlet located between the air outlet and the gap, and the cooling channel is isolated from the airflow channel in the radial direction perpendicular to the axial direction at the axial distance between the through holes and the air outlet.

[0015] A further improvement is as follows: the housing includes a support frame fixed inside the housing and a guide cone connected to the support frame, the air inlet is disposed on the support frame, and the air outlet passes through the end of the guide cone axially.

[0016] A further improvement is as follows: the hair dryer includes an auxiliary fan connected to the rotating shaft, and the motor includes a rotor connected to the rotating shaft, the rotor being axially located between the auxiliary fan and the air inlet.

[0017] Compared with the prior art, the present invention has the following advantages: By providing an extension rib that covers the radial gap on at least one of the housing and the fan hub, the airflow used to cool the motor is isolated from the airflow channel in the axial distance from the fan hub to the air outlet, preventing part of the airflow used to cool the motor from flowing into the airflow channel, reducing the loss of cooling airflow mixed with the main airflow, thereby improving the blowing efficiency; In addition, by isolating the cooling channel used to cool the motor from the airflow channel by the extension rib, the hot airflow passing through the motor is directly discharged from the air outlet of the housing and flows into the airflow channel. The flow direction of the cooling airflow in the cooling channel is the same as the flow direction of the main airflow in the airflow channel, preventing the hot airflow from flowing back into the cooling channel, thus improving the heat dissipation effect of the motor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a hair dryer according to a preferred embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view of the duct assembly of the hair dryer shown;

[0020] Figure 3 for Figure 2 A partial enlarged view of the duct assembly shown;

[0021] Figure 4 for Figure 1 The diagram shows the structure of the duct assembly of the hair dryer without the fan.

[0022] Figure 5 for Figure 1 The diagram shows the structure of the fan in the hair dryer.

[0023] Figure 6 for Figure 5 The diagram shows the structure of the fan from another angle;

[0024] Figure 7 This is a partial cross-sectional view of another embodiment of the duct assembly of this utility model.

[0025] Meaning of the reference numerals in the diagram:

[0026] Hair dryer 100, housing 10

[0027] Air inlet 11 Air outlet 12

[0028] Airflow channel 13, duct assembly 20

[0029] Mounting bracket 21 accommodates housing 22

[0030] Support frame 221, guide cone 222

[0031] 223 Guide vane 224 Support section

[0032] End cap 225, air inlet 226

[0033] Air outlet 227 Cooling channel 228

[0034] Motor 30, Shaft 31

[0035] Rotor 32, Stator 33

[0036] Fan 40, Wheel 41

[0037] Through hole 411, fan blade 42

[0038] Auxiliary fan 50, extension ribs 60, 60'

[0039] First extension rib 61 Second extension rib 62

[0040] Gap X 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 4 As shown, this utility model relates to a hair dryer 100, including a housing 10 extending axially and a duct assembly 20 housed within the housing 10. The housing 10 includes an air inlet 11, an air outlet 12, and an airflow channel 13 located between the air inlet 11 and the air outlet 12. The duct assembly 20 includes a mounting bracket 21 fixed to the housing 10 and a receiving outer shell 22 located within the mounting bracket 21. The mounting bracket 21 is generally a hollow cylindrical structure and forms part of the airflow channel 13, and the receiving outer shell 22 is located within the airflow channel 13.

[0044] The duct assembly 20 further includes a motor 30 located within a housing 22 and a fan 40 located within a mounting bracket 21. The motor 30 includes an axially extending shaft 31 that partially extends out of the housing 22, and the fan 40 includes a hub 41 connected to the shaft 31 and fan blades 42 extending from the hub 41 into an airflow passage 13. The motor 30 includes a rotor 32 connected to the shaft 31 and a stator 33 located within the rotor 32, the stator 33 being fixed to the shaft 31 by bearings.

[0045] The housing 22 includes a support frame 221 fixed to the mounting frame 21, a guide cone 222 connected to the support frame 221, and several spaced-apart stationary guide vanes 223 located between the support frame 221 and the mounting frame 21. The support frame 221 includes a cylindrical support portion 224 and an end cap 225 extending from the support portion 224 toward the rotating shaft 31. The guide cone 222 has a conical structure and forms a housing space with the support frame 221 to house the motor 30. The stationary guide vanes 223 are connected between the support portion 224 and the mounting frame 21 and are located within the airflow channel 13, thereby streamlining the airflow flowing within the airflow channel 13.

[0046] In the airflow direction, the fan 40, support frame 221, and guide cone 222 are arranged sequentially. The hub 41 is connected to the portion of the shaft 31 extending out of the end cover 225 and is axially spaced from the housing 22 by a gap X, that is, there is an axial gap X between the hub 41 and the end cover 225. The housing 22 includes several air inlets 226 axially penetrating the support portion 224 of the support frame 221 and air outlets 227 axially penetrating the tip of the guide cone 222. The motor 30 is located within the cooling channel 228. The air inlets 226 are in fluid communication with the gap X, and the air outlets 227 are in fluid communication with the airflow channel 13.

[0047] When the hair dryer 100 is working, the motor 30 drives the fan 40 to rotate, creating an air pressure difference between the inside and outside of the housing 10. Under the influence of the air pressure difference, the outside air enters the inside of the housing 10 from the air inlet 11 and forms the main airflow flowing in the airflow channel 13. The main airflow first forms a high-speed rotating airflow under the acceleration of the rotating fan 40, and then forms an axial airflow that is roughly parallel to the airflow channel 13 after being combed by the stationary guide vane 223. After being guided by the conical surface of the guide cone 222, it flows further along the axial direction and is then blown out from the air outlet 12 to realize the blowing function.

[0048] Combination Figure 5 and Figure 6As shown, the hub 41 includes several through holes 411 connecting the airflow channel 13 and the gap X. These through holes 411 axially penetrate the hub 41. The air inlet 226 is fluidly connected to the through holes 411 axially penetrating the hub 41 through the gap X. The air outlet 227 and the air inlet 226 are fluidly connected to the gap X, with the air inlet 226 located between the air outlet 227 and the gap X. The through holes 411, the gap X, the air inlet 226, and the air outlet 227 constitute a cooling channel 228 for cooling the motor 30. The flow direction of the cooling airflow within the cooling channel 228 is the same as the flow direction of the main airflow within the airflow channel 13. After the airflow enters the housing 10, part of the airflow enters the gap X through the through hole 411 of the hub 41, then enters the housing 22 through the air inlet 226 of the end cover 225 to flow in the cooling channel 228 and carry away the heat of the motor 30 through the motor 30. Finally, it flows into the airflow channel 13 from the air outlet 227, thereby achieving the effect of cooling the motor 30.

[0049] To further enhance the flow rate and speed within the cooling channel 228, the blower 100 also includes an auxiliary fan 50 connected to the rotating shaft 31. The auxiliary fan 50 is located within the housing 22, and the stator 33 and rotor 32 of the motor 30 are axially positioned between the auxiliary fan 50 and the air inlet 226. This allows the hot airflow passing through the stator 33 and rotor 32 to rapidly exit from the air outlet 227 under the acceleration of the auxiliary fan 50, improving the rapid exchange of hot and cold air and thus further enhancing the cooling effect of the motor 30.

[0050] Because there is an axial gap X between the hub 41 and the housing 22, some airflow may flow into the airflow channel 13 through this gap X, thereby reducing the airflow rate entering the cooling channel 228. To solve the above problem, at least one of the housing 22 and the fan 40 is provided with an extension rib 60 extending into the gap X. The extension rib 60 extends axially to isolate the gap X from the airflow channel 13. The cooling channel 228 is isolated from the airflow channel 13 in the radial direction perpendicular to the axial direction at the axial distance between the through hole 411 and the air outlet 227 of the hub 41, ensuring that the airflow after entering the through hole 411 can completely enter the cooling channel 228 to cool the motor 30.

[0051] The extension rib 60 can be set on the fan hub 41, or on the housing 22, or partly on the housing 22 and partly on the fan hub 41, as long as the extension rib 60 completely covers the gap X in the radial direction perpendicular to the axial direction to isolate the gap X from the airflow channel 13.

[0052] Please see Figures 2 to 5As shown, the extension rib 60 includes a first extension rib 61 extending from the hub 41 toward the end cap 225 housing the outer casing 22 and a second extension rib 62 extending from the end cap 225 housing the outer casing 22 toward the hub 41. The first extension rib 61 and the second extension rib 62 extend toward each other and at least partially overlap in the axial direction, thereby completely covering the gap X in the radial direction. Specifically, the radial dimension of the first extension rib 61 is larger than the radial dimension of the second extension rib 62, that is, the first extension rib 61 surrounds the outer periphery of the second extension rib 62 in the radial direction, so that the gap X is completely isolated from the airflow channel 13 in the radial direction, preventing the cooling airflow before entering the cooling channel 228 from being fully introduced, and preventing a large amount of airflow from flowing into the airflow channel 13 from the gap X, thereby causing a loss of cooling airflow. Of course, in other embodiments, the radial dimension of the second extension rib 62 can also be set to be larger than the radial dimension of the first extension rib 61, that is, the second extension rib 62 surrounds the outer periphery of the first extension rib 61 in the radial direction, as long as the gap X can be completely covered in the radial direction.

[0053] The phrase "completely covered radially" in this invention refers to the fact that the radial projection of the extension rib 60 almost completely overlaps with the projection of the gap X, and does not necessarily mean that the gap X forms a completely closed structure through the extension rib 60. Although it would be ideal to completely close the gap X relative to the airflow channel 13, since the fan hub 41 rotates relative to the housing 22, a small radial distance is left between the first extension rib 61 and the second extension rib 62, thus ensuring that the hub 41 and the housing 22 rotate relative to each other without wear. However, since the first extension rib 61 and the second extension rib 62 at least partially overlap axially, this small distance forms a labyrinthine structure, which does not cause significant airflow loss.

[0054] Of course, the first extension rib 61 and the second extension rib 62 can also be set to the same size. Although such a structure will leave a certain axial distance between the first extension rib 61 and the second extension rib 62, as long as the axial distance is small, it will not cause a large airflow loss. It's just that the amount of airflow loss will be a little higher than the amount of airflow loss in the above embodiment.

[0055] Figure 7The second embodiment of this utility model is disclosed. The extending rib 60' is configured to extend from the housing 22 toward the fan hub 41 and partially extend to the outer periphery of the fan hub 41. The radial dimension of the support frame 221 of the housing 22 is larger than the radial dimension of the fan hub 41. The extending rib 60' extends from the outer periphery of the support frame 221, and its radial dimension is larger than that of the fan hub 41, and it partially overlaps with the fan hub 41 in the axial direction. By partially surrounding the outer periphery of the fan hub 41 with the extending rib 60' and forming a maze-like structure between them, the extending rib 60' completely covers the gap X in the radial direction. This ensures that the airflow after passing through the through hole of the hub 41 can completely enter the cooling channel, ensuring the cooling effect of the motor. In addition, the flow direction of the cooling airflow used to cool the motor is the same as the flow direction of the main airflow in the airflow channel, which also avoids airflow loss due to different flow directions, thereby improving the blowing efficiency.

[0056] Of course, in other embodiments, the radial dimension of the fan hub 41 can be set to be larger than the radial dimension of the support frame 221, and the extension rib 60' extends from the outer periphery of the fan hub 41 toward the support frame 221. The radial dimension of the extension rib 60' is larger than the radial dimension of the housing 22 and surrounds the outer periphery of the support portion 224 in the radial direction, so that the extension rib 60' completely covers the gap X in the radial direction, thereby ensuring the cooling effect of the motor 30.

[0057] This invention isolates the cooling airflow for cooling the motor 30 from the airflow channel 13 in the axial distance from the fan hub 41 to the air outlet 227 by providing extending ribs 60, 60' on at least one of the housing 22 and the fan hub 41 in a radially covering gap. This prevents a portion of the airflow for cooling the motor 30 from merging into the main airflow of the airflow channel 13, reducing losses due to the mixing of cooling airflow with the main airflow and thus improving blowing efficiency. In addition, the extending ribs 60, 60' isolate the cooling channel 228 for cooling the motor from the airflow channel 13, allowing the hot airflow from the motor to be discharged directly from the air outlet 227 of the housing and merge into the airflow channel 13. The cooling airflow in the cooling channel 228 flows in the same direction as the main airflow in the airflow channel 13, preventing the hot airflow from flowing back into the cooling channel and improving the heat dissipation effect of the motor 30.

[0058] 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 hair dryer of this utility model without departing from its principles and scope. The scope of protection of this utility model is determined by the claims.

Claims

1. A hair dryer, comprising an axially extending housing, a motor and a fan housed within the housing, the housing including an air inlet, an air outlet, an airflow channel between the air inlet and the air outlet, and a receiving outer shell located within the airflow channel, the motor being located within the receiving outer shell and including a rotating shaft extending out of the receiving outer shell, the fan including a hub connected to the rotating shaft, the hub and the receiving outer shell being axially spaced apart by a gap, the hub including a plurality of through holes communicating with the airflow channel and the gap, the receiving outer shell including an air outlet in fluid communication with the gap, the through holes, the gap and the air outlet forming a cooling channel for cooling the motor, the airflow direction in the cooling channel being the same as the airflow direction in the airflow channel; characterized in that: At least one of the housing and the fan is provided with an extension rib extending into the gap, the extension rib extending axially to isolate the gap from the airflow passage.

2. The hair dryer according to claim 1, characterized in that: The extension rib completely covers the gap in a radial direction perpendicular to the axial direction to isolate the gap from the airflow channel.

3. The hair dryer according to claim 2, characterized in that: The extension rib extends from the housing towards the hub, and the radial dimension of the extension rib is greater than the radial dimension of the hub.

4. The hair dryer according to claim 2, characterized in that: The extension rib extends from the hub toward the housing housing, and the radial dimension of the extension rib is greater than the radial dimension of the housing housing.

5. The hair dryer according to claim 1, characterized in that: The extension rib includes a first extension rib extending from the hub toward the housing shell and a second extension rib extending from the housing shell toward the hub.

6. The hair dryer according to claim 5, characterized in that: The first extension rib and the second extension rib extend toward each other and at least partially overlap in the axial direction, thereby completely covering the gap in the radial direction.

7. The hair dryer according to claim 5, characterized in that: The radial dimension of the first extension rib is greater than the radial dimension of the second extension rib.

8. The hair dryer according to any one of claims 1 to 7, characterized in that: Several through holes extend axially through the hub, the housing includes an air inlet located between the air outlet and the gap, and the cooling channel is isolated from the airflow channel in a radial direction perpendicular to the axial direction at the axial distance between the through holes and the air outlet.

9. The hair dryer according to claim 8, characterized in that: The housing includes a support frame fixed inside the housing and a guide cone connected to the support frame. The air inlet is disposed on the support frame, and the air outlet passes through the end of the guide cone axially.

10. The hair dryer according to claim 9, characterized in that: The hair dryer includes an auxiliary fan connected to the rotating shaft, and the motor includes a rotor connected to the rotating shaft, the rotor being axially located between the auxiliary fan and the air inlet.

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