Hair dryer

Abstract

This invention relates to a hair dryer, comprising an axially extending housing, a battery pack detachably connected to the housing, a power assembly at least partially housed within the housing, and a duct assembly connected to the housing. The housing includes a connecting portion connected to the duct assembly, a body portion connected to the axially rearward side of the connecting portion, and a mounting portion for connecting the battery pack and connected to the body portion. The power assembly includes a motor at least partially located within the body portion and a fan driven by the motor to rotate, the fan rotation generating airflow through the interior of the duct assembly. The body portion includes an air inlet axially communicating with the outside and a pre-air intake region located axially rearward side of the air inlet. The air inlet is located on both sides of the mounting portion in a transverse direction perpendicular to the axial direction. This invention improves air intake efficiency by providing an axially rearward-opening air inlet and a pre-air intake region located axially rearward side of the air inlet.

Description

Technical Field

[0001] This invention relates to a hair dryer, and more particularly to a hair dryer that improves air intake efficiency while reducing costs. Background Technology

[0002] A hair dryer is a common gardening tool. It consists of a housing, a duct connected to the housing, a conduit housed within the housing, a motor located within the conduit, and a fan driven by the motor. During use, the fan's rotation creates negative pressure inside the housing, drawing in outside air through the housing's inlet and out through the duct's outlet, thus blowing fallen leaves or dust to a specific location. Currently, to prevent debris from entering the housing due to the negative pressure generated by the fan, a detachable air inlet cover with a grille is usually installed at the air inlet. This increases the number of parts, leading to more assembly steps and thus higher material and assembly costs.

[0003] Therefore, it is indeed necessary to provide an improved hair dryer to overcome the shortcomings of the existing technology. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a hair dryer that can improve air intake efficiency while reducing costs.

[0005] The present invention addresses the problems of the prior art by adopting the following technical solution: A hair dryer includes a housing extending axially, a battery pack detachably connected to the housing, a power component at least partially housed within the housing, and a duct assembly connected to the housing. The housing includes a connecting portion connected to the duct assembly, a body portion connected to the axially rearward side of the connecting portion, and a mounting portion for connecting the battery pack and connected to the body portion. The power component includes a motor at least partially located within the body portion and a fan driven to rotate by the motor. The rotation of the fan generates airflow passing through the interior of the duct assembly. The body portion includes an air inlet in axial fluid communication with the outside and a pre-air intake area located axially rearward side of the air inlet. The air inlet is generally located on both sides of the mounting portion in a transverse direction perpendicular to the axial direction.

[0006] A further improvement is as follows: the mounting part is connected to the axial rear end of the main body, and the air inlet and the pre-air inlet area are located axially between the mounting part and the connecting part.

[0007] A further improvement is as follows: the main body is provided with a receiving wall located at the rear end of the axis and connected to the mounting part, the air inlet is axially open to the rear, and the axially spaced area between the receiving wall and the air inlet constitutes the pre-air intake area.

[0008] A further improvement is as follows: the axial rear end of the main body is provided with a receiving wall connected to the mounting part, and the axial interval area between the receiving wall and the air inlet constitutes the pre-air intake area.

[0009] A further improvement is as follows: the main body includes an expansion wall connecting the connecting part and the air inlet, and an extension wall connecting the air inlet and the receiving wall. The lateral dimension of the expansion wall is larger than that of the extension wall. The air inlet is located on the protruding area of ​​the expansion wall that protrudes laterally from the extension wall. The extension wall extends forward axially from the receiving wall and is laterally recessed inward to form the pre-air intake area.

[0010] A further improvement is that both the expansion wall and the extension wall are roughly closed structures in the lateral direction.

[0011] A further improvement is as follows: the hair dryer includes several guide sections spaced apart at the air inlet, and the axial extension direction of the guide sections is approximately parallel to the insertion and removal direction of the battery pack.

[0012] A further improvement is that the flow guide and the main body are integrally formed.

[0013] A further improvement is that the ratio of the maximum horizontal dimension of the air inlet to the maximum horizontal dimension of the main body is greater than or equal to 0.1.

[0014] A further improvement is as follows: the housing includes a handle portion connecting the body portion and the mounting portion, and the axial rear end of the body portion is provided with a receiving wall connected to the mounting portion. The receiving wall includes a first side wall facing the handle portion and a second side wall facing the battery pack. In the vertical direction perpendicular to the axial and lateral directions, the first side wall and the second side wall are respectively located on opposite sides of the mounting portion.

[0015] A further improvement is that the projection of the air inlet in the vertical direction at least partially coincides with the projection of the handle in the vertical direction, and the projection of the air inlet in the axial direction at least partially coincides with the projection of the battery pack in the axial direction.

[0016] Compared with the prior art, the present invention has the following beneficial effects: by setting an axially rearward open air inlet and a pre-air inlet area located on the axial rear side of the air inlet, the air intake efficiency is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a hair dryer according to a preferred embodiment of the present invention;

[0018] Figure 2 for Figure 1The image shows a front view of a hair dryer after the blower tube has been removed.

[0019] Figure 3 for Figure 2 The hairdryer shown is viewed from below.

[0020] Figure 4 for Figure 1 The right view of the hair dryer shown;

[0021] Figure 5 for Figure 2 A partial disassembly diagram of the hair dryer shown;

[0022] Figure 6 yes Figure 2 The image shows a cross-sectional view of a hair dryer.

[0023] Meaning of the reference numerals in the diagram:

[0024] Hair dryer 100, housing 10

[0025] Connecting part 11 Main body 12

[0026] Air inlet 121, receiving wall 122

[0027] Extended wall 123 Extension wall 124

[0028] Pre-inlet air zone 125 First expansion section 126

[0029] Second diameter expansion section 127, arc section 128

[0030] First sidewall 129 Second sidewall 120

[0031] Installation section 13, guide rail 131

[0032] Handle part 14 Support part 15

[0033] Front 151 Rear 152

[0034] Middle section 153, middle groove 154

[0035] Gap 155, Guide section 16

[0036] Power Component 20 Motor 21

[0037] Drive shaft 211 Fan 22

[0038] Wheel hub 221, fan blade 222

[0039] Motor housing 23, guide cone 24

[0040] Duct assembly 30, blower duct 31

[0041] Air outlet 311, air inlet duct 32

[0042] Casing 321, guide vane 322

[0043] Drainage section 323 Pop-up structure 40

[0044] Rotating rod 41, elastic element 42

[0045] Bump 43 Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0047] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0048] Please see Figures 1 to 6 As shown, an embodiment of the present invention relates to a hair dryer 100, including a housing 10 extending axially, a power assembly 20 at least partially housed within the housing 10, a duct assembly 30 connected to the axial front end of the housing 10, and a battery pack (not shown) connected to the axial rear end of the housing 10.

[0049] The housing 10 includes a connecting portion 11 connected to the duct assembly 30, a body portion 12 connected to the axial rear side of the connecting portion 11, and a mounting portion 13 for connecting a battery pack and connected to the body portion 12. The battery pack is detachably connected to the mounting portion 13 axially. In the axial direction, the connecting portion 11, the body portion 12, and the mounting portion 13 are arranged sequentially. The housing 10 includes a handle portion 14 with one end connected to the top of the body portion 12 and the other end connected to the top of the mounting portion 13. The handle portion 14 extends upward and is spaced apart from the body portion 12 and the mounting portion 13 to form a gripping space for the user to hold.

[0050] The duct assembly 30 includes a blower duct 31 detachably connected to the connector 11 and an inlet duct 32 at least partially housed within the housing 10. The blower duct 31 and the inlet duct 32 together form an internal airflow channel. The inlet duct 32 includes a housing 321 fixed to the interior of the housing 10, and the power assembly 20 is at least partially housed within the housing 321. The power assembly 20 includes a motor 21 with a drive shaft 211 and a fan 22 driven to rotate by the motor 21. The rotation of the fan 22 generates airflow through the channel of the duct assembly 30.

[0051] The power assembly 20 also includes a motor housing 23 that at least partially houses the motor 21 and a guide cone 24 connected to the axial front end of the motor housing 23. The motor 21 is housed within the internal space formed by the motor housing 23 and the guide cone 24. The guide cone 24 is configured as a tapered structure that gradually slopes towards the drive shaft 211 from rear to front. The drive shaft 211 extends axially rearward out of the motor housing 23. The fan 22 includes a hub 221 fixed to the drive shaft 211 extending out of the motor housing 23 and several fan blades 222 extending from the outer periphery of the hub 221 into a channel. A generally annular airflow channel is formed between the motor housing 23 and the outer casing 321 of the air inlet duct 32. The blower 100 also includes a stationary guide vane 322 connected between the outer casing 321 and the motor housing 23. In the airflow direction, the stationary guide vane 322 is located downstream of the fan blades 222.

[0052] Please refer to Figure 1 and Figure 2 As shown, the housing 10 includes a support portion 15 located at the bottom of the body portion 12 to support the entire device. Axially, the extension length of the support portion 15 substantially covers the entire axial length of the body portion 12. In the vertical direction perpendicular to the axial direction, the handle portion 14 and the support portion 15 are located on opposite sides of the body portion 12. The mounting portion 13 extends substantially axially to allow the battery pack to be slidably connected axially to provide power to the power assembly 20.

[0053] The main body 12 includes an axially rearward-opening air inlet 121, and the air blowing pipe 31 includes an air outlet 311 located at the axially front end. The air inlet 121 is axially rearward-opening, meaning it is in axial fluid communication with the outside environment. Figure 6 As shown, when the blower 100 is running, the drive shaft 211 rotates, causing the fan blades 222 to rotate and generating negative pressure in the channel. Outside air enters the channel of the air inlet pipe 32 under the influence of air pressure. After being accelerated by the rotation of the fan blades 222, it is combed by the stationary guide vanes 322 into an airflow that is basically parallel to the axial direction. Then, it is guided by the guide cone 24 into the blower pipe 31 and blown out from the air outlet 311. Axially, the blower pipe 31, the air inlet pipe 32, and the mounting part 13 are basically aligned, so that the airflow does not change its flow direction significantly after entering the housing 10. Furthermore, the airflow at least partially flows through the battery pack before entering the housing 10 to cool the battery pack.

[0054] Mounting part 13 is connected to the axial rear end of body part 12. Body part 12 includes a receiving wall 122 located at the axial rear end, an expansion wall 123 connecting the aforementioned connecting part 11 and the air inlet 121, and an extension wall 124 connecting the air inlet 121 and the receiving wall 122. In the transverse direction perpendicular to the axial direction, the size of the expansion wall 123 is larger than the size of the extension wall 124. The air inlet 121 is disposed on the axially protruding area of ​​the expansion wall 123 that is laterally protruding from the extension wall 124. At the same time, the extension wall 124 extends axially forward from the receiving wall 122 and is laterally recessed inward to form an axially spaced area between the air inlet 121 and the receiving wall 122. This axially spaced area constitutes a pre-air intake area 125. Figure 3 and Figure 4 As shown, the air inlet 121 and the pre-air intake area 125 are located axially between the mounting portion 13 and the connecting portion 11, and laterally on both sides of the mounting portion 13. The pre-air intake area 125 is located axially behind the air inlet 121. This arrangement allows the external airflow to enter the pre-air intake area 125 before entering the main body 12, and under the guidance of the extension wall 124, it forms a roughly axial airflow. The axial airflow entering the main body 12 will not lose some airflow due to excessive flow direction or turbulence, thereby improving the air intake efficiency. The vertical projection of the air inlet 121 at least partially coincides with the vertical projection of the handle portion 14, and the axial projection of the air inlet 121 at least partially coincides with the axial projection of the battery pack.

[0055] Combination Figure 4 As shown, the expansion wall 123 is configured to extend outward from both sides of the main body 12, and includes a first expansion section 126 extending outward from the top of the main body 12, a second expansion section 127 extending outward from the bottom of the main body 12, and an arc section 128 connecting the first expansion section 126 and the second expansion section 127. Viewed axially from back to front, the sum of the circumferential arcs of the expansion walls 123 on both sides of the main body 12 is greater than or equal to 90°. After multiple tests, when the ratio of the maximum lateral dimension of the air inlet 121 to the maximum lateral dimension of the main body 12 (the area of ​​the arc section 128 of the expansion wall 123) is greater than or equal to 0.1, the air intake efficiency can meet the needs of most working scenarios in the market.

[0056] The blower 100 also includes several guide sections 16 spaced apart at the air inlet 121. These guide sections 16 are spaced apart to prevent external debris from entering the housing 10 and damaging the power assembly 20. The extension direction of the guide sections 16 is parallel to the axial direction, allowing the airflow passing through the pre-air intake region 125 to be more closely aligned with the axial airflow, preventing the airflow from impacting the inner side of the expansion wall 123 and causing excessive noise. The guide sections 16 are integrally formed with the main body 12, eliminating the need for an additional air guide cover and reducing mold, material, and assembly costs. The axial extension direction of the guide sections 16 is approximately parallel to the insertion / removal direction of the battery pack. The airflow entering the housing 10 passes at least partially over the outer surface of the battery pack before entering the pre-air intake region 125, and is then guided by the extension wall 124 to enter the expansion wall 123 through the gaps in the guide sections 16. "Approximately parallel" here does not specifically mean perfectly parallel; slight deviations or an angle between them are acceptable.

[0057] The receiving wall 122 includes a first sidewall 129 facing the handle portion 14 and a second sidewall 120 facing the battery pack. Vertically, the first sidewall 129 and the second sidewall 120 are located on opposite sides of the mounting portion 13. The second sidewall 120 extends vertically along the bottom side of the mounting portion 13, and is substantially perpendicular to the mounting portion 13. The first sidewall 129 extends forward and upward from the top of the mounting portion 13 to the front end of the handle portion 14. An air inlet 121 is axially located approximately at the intersection of the first sidewall 129 and the front end of the handle portion 14; laterally, the air inlet 121 is located on either side of the first sidewall 129. The first sidewall 129 forms an obtuse angle with the top surface of the mounting portion 13 to increase the grip space.

[0058] Please see Figure 5 and Figure 6 As shown, the mounting portion 13 extends axially rearward from the top end of the second sidewall 120 and has a guide rail 131 formed on its lower surface for guiding the installation or removal of the battery pack. The second sidewall 120 is provided with a pop-out structure 40 for the battery pack; please refer to [reference needed]. Figure 6 As shown, the pop-out structure 40 includes a rotating rod 41 rotatably fixed to the second side wall 120 and an elastic member 42 telescopically fixed within the second side wall 120. The end of the rotating rod 41 has a protrusion 43 protruding from the second side wall 120. The elastic member 42 presses against the rotating rod 41, ensuring that the protrusion 43 always has a tendency to protrude from the second side wall 120. When the battery pack is unlocked, the protrusion 43 presses against the battery pack and pops out of the mounting portion 13 axially.

[0059] Combination Figure 2As shown, the rear end of the air inlet duct 32 is attached to the inner side of the expansion wall 123. The rear end of the air inlet duct 32 is provided with a guide portion 323, which is configured as a conical ring. That is, in the axial direction, the diameter of the guide portion 323 gradually decreases from rear to front, so that the airflow of the main body 12 can be effectively guided into the air inlet duct 32 before passing through the power assembly 20. The air inlet 121 is located in the axial direction between the guide portion 323 and the second side wall 120, so that the airflow has a longer distance after entering the main body 12 to tend to the axial airflow, avoiding the formation of too many vortices impacting the inner side of the main body 12 and increasing noise, while also improving the air intake efficiency.

[0060] Combination Figure 3 and Figure 4 As shown, the support portion 15 includes a front portion 151 connected to the axial front end of the main body portion 12, a rear portion 152 connected to the bottom end of the second side wall 120, and a middle portion 153 connecting the front portion 151 and the rear portion 152. The middle portion 153 has a middle groove 154, and the extension wall 123 of the main body portion 12 has several spaced-apart air inlets corresponding to the middle groove 154. The rear portion 152 has a notch 155, and the main body portion 12 also has several spaced-apart air inlets corresponding to the notch 155. By providing several spaced-apart air inlets at the bottom of the main body portion 12 and the rear portion 152, the air intake area is increased, and the blowing efficiency is improved.

[0061] In this embodiment, the expansion wall 123 and the extension wall 124 are generally closed in the lateral direction, and the receiving wall 122 is also generally closed in the axial direction. The term "generally closed" means that it can be completely closed, that is, there is no fluid communication with the outside; or it can be provided with a small number of openings to allow small airflow to pass through the inside and outside of the housing 10.

[0062] In the above embodiments, the battery pack is axially mounted on the rear side of the second side wall 120 of the receiving wall 122. In other embodiments, the mounting portion 13 may extend from the first side wall 129 of the receiving wall 122 toward the outside or inside of the housing 10, such that the battery pack at least partially overlaps with the main body 12 in the vertical direction, while the rest of the structure remains unchanged. That is, the air inlet 121 is still located on both sides of the mounting portion 13 in the lateral direction. This arrangement can further reduce the axial dimension of the whole machine while ensuring air intake efficiency and cost. The insertion and removal direction of the battery pack can be vertical or inclined to the axial direction.

[0063] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions to the hair dryer of this invention can be found without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. A hair dryer, comprising an axially extending housing, a battery pack detachably connected to the housing, a power assembly at least partially housed within the housing, and a duct assembly connected to the housing, the housing including a connecting portion connected to the duct assembly, a body portion connected to an axially rearward side of the connecting portion, and a mounting portion for connecting the battery pack and connecting to the body portion, the power assembly including a motor at least partially located within the body portion and a fan driven to rotate by the motor, the fan rotation generating airflow through the interior of the duct assembly; characterized in that: The main body includes an air inlet that is in axial fluid communication with the outside and a pre-air intake area located on the axial rear side of the air inlet. The air inlet and the pre-air intake area are approximately located on both sides of the mounting part in the transverse direction perpendicular to the axial direction. The main body includes a receiving wall located on the axial rear side, an expansion wall connecting the connecting part and the air inlet, and an extension wall connecting the air inlet and the receiving wall. The transverse dimension of the expansion wall is larger than the transverse dimension of the extension wall. The air inlet is disposed on the protruding area of ​​the expansion wall that is transversely protruding from the extension wall and the air inlet is axially open to the rear. The mounting part is located on the axial rear side of the air inlet and the pre-air intake area.

2. The hair dryer according to claim 1, characterized in that: The mounting part is connected to the axial rear end of the main body, and the air inlet and the pre-air inlet area are located axially between the mounting part and the connecting part.

3. The hair dryer according to claim 2, characterized in that: The axial gap between the receiving wall and the air inlet constitutes the pre-air intake area.

4. The hair dryer according to claim 3, characterized in that: The extension wall extends axially forward from the receiving wall and is laterally recessed inward to form the pre-air intake area.

5. The hair dryer according to claim 4, characterized in that: Both the expansion wall and the extension wall are generally closed structures in the lateral direction, and the insertion and removal direction of the battery pack is perpendicular to the protruding area.

6. The hair dryer according to claim 1, characterized in that: The hair dryer includes several air guides spaced apart at the air inlet, and the axial extension direction of the air guides is approximately parallel to the insertion and removal direction of the battery pack.

7. The hair dryer according to claim 6, characterized in that: The flow guide is integrally formed with the main body.

8. The hair dryer according to claim 1, characterized in that: The ratio of the maximum horizontal dimension of the air inlet to the maximum horizontal dimension of the main body is greater than or equal to 0.

1.

9. The hair dryer according to claim 1, characterized in that: The housing includes a handle portion connecting the body portion and the mounting portion. The axial rear end of the body portion is provided with a receiving wall connected to the mounting portion. The receiving wall includes a first side wall facing the handle portion and a second side wall facing the battery pack. In the vertical direction perpendicular to the axial and lateral directions, the first side wall and the second side wall are respectively located on opposite sides of the mounting portion.

10. The hair dryer according to claim 9, characterized in that: The vertical projection of the air inlet coincides at least partially with the vertical projection of the handle portion, and the axial projection of the air inlet coincides at least partially with the axial projection of the battery pack.

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