Hollow air duct and hair dryer

Abstract

The utility model discloses a hollow air duct and hair dryer. The hollow air duct has a hollow chamber, which has an upstream end and a downstream end, and airflow is driven by a power source to flow from the upstream end to the downstream end to form a negative pressure at the upstream end to suck hair into the hollow chamber, wherein the hollow air duct comprises a flow guide cover arranged at the upstream end, the flow guide cover is annular, and the outer surface thereof is arranged in an arc shape inward from the outer edge of the annular to the inner edge to guide hair into the hollow chamber. The hollow air duct and hair dryer provided by the utility model are easy to realize drying and styling of long hair.

Description

Technical Field

[0001] This utility model relates to the field of hair care equipment technology, and in particular to a hollow hair dryer and hair dryer. Background Technology

[0002] In the field of personal care appliances, hair dryers are a common hair styling tool widely used for quick hair drying and simple styling. Traditional hair dryers mainly consist of a motor, fan, heating element, and outer casing. Their working principle is that the motor drives the fan to rotate, generating airflow. This airflow is heated by the heating element and then blown out from the air outlet of the hair dryer, directly acting on the hair to achieve drying.

[0003] However, traditional hair dryers have some problems in actual use. On the one hand, when drying hair with a traditional hair dryer, users need to manually adjust the position of their hair to ensure that every section of hair is fully dried by the airflow. This process is quite tedious, especially for users with long hair, making it very inconvenient to operate. It not only consumes a lot of time and energy but also easily leads to hand fatigue. On the other hand, the airflow direction of a traditional hair dryer is relatively unidirectional and fixed, making it difficult to cover the hair comprehensively and evenly. This often results in uneven drying of the hair, with some sections of hair drying while others remain damp, affecting the final drying effect and hair quality.

[0004] Therefore, it is necessary to propose a technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model proposes a hollow air duct and hair dryer, which makes it easy to dry and style long hair.

[0006] This utility model is achieved through the following technical solution: a hollow air duct with a hollow chamber, the hollow air duct having an upstream end and a downstream end, the airflow being driven by a power source to flow from the upstream end to the downstream end to form a negative pressure at the upstream end to draw hair into the hollow chamber, wherein the hollow air duct includes a guide shroud disposed at the upstream end, the guide shroud being annular, its outer surface being arc-shaped and inwardly tapering from the outer edge of the annulus to guide hair into the hollow chamber.

[0007] As a further improved technical solution, the outer surface of the flow guide cover is provided with anti-clogging texture.

[0008] As a further improved technical solution, the anti-blocking texture is an alternating strip-shaped concave-convex structure or a dot-shaped concave-convex structure.

[0009] As a further improved technical solution, the inner surface of the flow guide cover is provided with several radially extending reinforcing ribs.

[0010] As a further improved technical solution, the hollow duct includes a shell that extends through the upstream and downstream ends, and the air guide cover is installed at one end of the shell by screws and / or clips.

[0011] As a further improved technical solution, the hollow air duct includes an outer shell, and the air guide cover is integrally formed from the outer shell.

[0012] As a further improved technical solution, the hollow air duct includes a hollow inner cylinder disposed within the outer shell, and a flow guide disposed between the hollow inner cylinder and the outer shell. The flow guide is configured to guide the airflow to flow towards the upstream end first, and then reverse and blow it into the hollow cavity.

[0013] As a further improved technical solution, the hollow inner cylinder is provided with a flared portion near the upstream end, and the inner edge of the flow guide cover is located inside the flared portion.

[0014] As a further improved technical solution, the flow guide is provided with an arc-shaped bend near the upstream end, the free end of the arc-shaped bend abuts against the inner edge of the flow guide cover, and an airflow inlet is formed between the free end of the arc-shaped bend and the flared part.

[0015] This utility model is also achieved through the following technical solution: a hair dryer, the hair dryer including a handle and a hollow air tube as described above, wherein an airflow input channel is provided inside the handle, and the airflow input channel is connected to the hollow cavity.

[0016] The hollow air blower provided by this utility model has an airflow driven by a power source to flow from the upstream end to the downstream end, so as to form a negative pressure at the upstream end to draw hair into the hollow chamber. The hollow air blower includes a guide cover at the upstream end. The guide cover is annular, and its outer surface is arc-shaped and inwardly recessed from the outer edge of the annulus to guide the hair into the hollow chamber. This design makes it easier for long hair to enter the hollow chamber for drying or styling, greatly facilitating the drying and styling of long hair. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the hair dryer of this utility model.

[0018] Figure 2 This is another perspective view of an embodiment of the hair dryer of this utility model.

[0019] Figure 3 This is a cross-sectional view of an embodiment of the hair dryer of this utility model.

[0020] Figure 4 yes Figure 3 A magnified view of a section of the hollow ventilation duct.

[0021] Figure 5 This is a three-dimensional exploded view of an embodiment of the hair dryer of this utility model.

[0022] Figure 6 This is a perspective view of the air guide component in one embodiment of the hair dryer of this utility model.

[0023] Figure 7 This is a perspective view of the heating element in one embodiment of the hair dryer of this utility model.

[0024] Figure 8 This is a perspective view of the air guide cover in one embodiment of the hair dryer of this utility model.

[0025] Figure 9 This is a perspective view of another hollow air tube in one embodiment of the hair dryer of this utility model.

[0026] The attached figures are labeled as follows: 1. Handle; 11. Operation button; 12. Air inlet; 13. Electrical connector; 101. Airflow input channel; 102. Upper port; 2. Hollow air duct; 201. Upstream end; 202. Downstream end; 203. Airflow inlet; 21. Outer shell; 22. Hollow inner cylinder; 220. Hollow cavity; 221. Heat-conducting fins; 23. Heating element; 231. Support plate; 232. Fixed outer ring; 233. Fixed inner ring; 2331. Slanted end face; 24. Air guide; 240. Airflow distribution cavity; 241. Arc-shaped bend; 25. Air guide cover; 251. Anti-clogging texture; 252. Reinforcing rib; 26. Circuit assembly; 27. Liner; 28. Outer cover. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] This utility model relates to a hollow hair dryer and a hair dryer, belonging to the technical field of hair care appliances. It aims to solve the problems of cumbersome operation and uneven hair drying associated with traditional hair dryers. The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please see Figures 1 to 9 As shown, the hair dryer of this utility model mainly consists of two parts: a handle 1 and a hollow air tube 2. The handle 1, which is held and operated by the user, has an airflow input channel 101 inside, which is connected to the hollow chamber 220 of the hollow air tube 2, providing a path for airflow. The hollow air tube 2 includes an outer shell 21, a hollow inner tube 22, and heating elements 23, air guides 24, etc., disposed between the hollow inner tube 22 and the outer shell 21, which work together to heat and transport the airflow.

[0031] Please refer to this carefully. Figure 4 As shown, the hollow air duct 2 is the body and outlet of the hair dryer, and in this embodiment, it is a hollow cylinder roughly perpendicular to the handle 1. The hollow air duct 2 has an upstream end 201 and a downstream end 202, with airflow driven by a power source flowing from the upstream end 201 to the downstream end 202. At the upstream end 201, a negative pressure is created due to the airflow characteristics, thereby drawing hair into the hollow chamber 220. This design allows hair to automatically enter the air duct, eliminating the need for frequent manual adjustments by the user and greatly improving ease of use.

[0032] A guide shroud 25, which is annular in shape, is provided at the upstream end 201 of the hollow air duct 2. Its outer surface tapers inward from the outer edge to the inner edge in an arc shape. This unique shape design effectively guides hair into the hollow chamber 220. As hair approaches the upstream end 201, the arc-shaped, tapering outer surface acts like a guide channel, gradually drawing the hair into the air duct, preventing hair accumulation and tangling at the inlet and improving the smoothness of hair intake.

[0033] Furthermore, the outer surface of the airflow guide cover 25 is provided with anti-clogging textures 251. In this embodiment, the anti-clogging textures 251 are alternating strip-shaped concave-convex structures. In other embodiments, the anti-clogging textures 251 can also be other structures, such as dot-shaped concave-convex structures. When the user is using the airflow guide cover 25 completely close to the scalp or when the user places one end of the airflow guide cover 25 on a flat surface without turning off the device, the design of the anti-clogging textures 251 will create gaps between the airflow guide cover 25 and the scalp or flat surface, preventing the upstream end 201 of the airflow output channel 220 from being completely blocked, ensuring smooth airflow and preventing overheating. During the process of pulling out the hair after styling, the anti-clogging textures 251 allow ambient temperature airflow to quickly pass through the hair to cool it. At the same time, the alternating concave-convex structures can also disperse the hair to a certain extent, allowing the hair to enter the hollow cavity 220 more evenly, further improving the efficiency of hair intake. Furthermore, the inner surface of the airflow guide cover 25 is provided with several radially extending reinforcing ribs 252. The reinforcing ribs 252 enhance the structural strength of the airflow guide cover 25, making it less prone to deformation when subjected to airflow impact and hair pulling. The radial layout allows the reinforcing ribs 252 to evenly distribute the force, ensuring the overall stability of the airflow guide cover 25, thereby ensuring that its function of guiding hair into the hollow cavity 220 can be stably performed.

[0034] Please see Figure 4 , Figure 5 and Figure 7 As shown, the hollow duct 2 includes a shell 21 extending through the upstream end 201 and the downstream end 202. In this embodiment, the flow guide shroud 25 is installed at one end of the shell 21 by screws and / or clips. Screw installation provides a more secure connection, ensuring the flow guide shroud 25 will not loosen during use; clip installation offers the advantages of convenient and quick installation and disassembly, facilitating cleaning or replacement of the flow guide shroud 25. In practical applications, a single installation method can be selected according to specific needs, or screws and clips can be combined to balance the strength of the connection and ease of operation. In other embodiments, such as... Figure 8 As shown, the air deflector 25 is integrally formed from the outer shell 21. This design simplifies the manufacturing process, reduces the number of parts, and lowers production costs. At the same time, the integrally formed structure eliminates any gaps between the air deflector 25 and the outer shell 21, improving the overall aesthetics and sealing performance, and preventing problems such as airflow leakage or hair getting stuck that could occur due to gaps.

[0035] Please continue reading. Figure 4 and Figure 5As shown, the hollow air duct 2 also includes a hollow inner cylinder 22 disposed within the outer shell 21, and a flow guide 24 disposed between the hollow inner cylinder 22 and the outer shell 21. The flow guide 24 is configured to guide the airflow to flow first towards the upstream end 201, and then reverse and blow it back into the hollow cavity 220, as shown. Figure 4 As indicated by the middle arrow. This design allows the airflow to form a vortex within the hollow inner cylinder 22, increasing the contact time between the airflow and the heating element 23 and the hollow inner cylinder 22, thus improving heating efficiency. More importantly, compared to the traditional design where the airflow flows directly downstream from the handle 1, this design creates a negative pressure zone near the upstream end 201. This allows hair near the upstream end 201 to be automatically drawn into the hollow inner cylinder 22 along with the external airflow, achieving styling such as perming and straightening. Specifically, the guide element 24 has an arc-shaped bend 241 near the upstream end 201. The free end of the arc-shaped bend 241 abuts the inner edge of the guide cover 25, forming an airflow inlet 203 between the free end of the arc-shaped bend 241 and the flared portion. The arc-shaped bend 241 design allows the airflow to smoothly change direction during flow, reducing energy loss.

[0036] In this embodiment, the hollow inner cylinder 22 has a flared portion near the upstream end 201, and the inner edge of the guide shroud 25 is located within the flared portion. The flared portion has a gradually narrowing diameter, resembling a trumpet, extending from the upstream end 201 to the downstream end 202. The flared portion increases the inlet area for airflow into the hollow chamber 220, allowing for smoother airflow entry. Simultaneously, the inner edge of the guide shroud 25, located within the flared portion, better cooperates with it, guiding airflow and hair into the hollow chamber 220 and preventing turbulence at the inlet.

[0037] In this embodiment, the flared portion is formed on a component detachably mounted on the hollow inner cylinder 22. In this embodiment, the heating element 23 includes a fixed inner ring 233 with a beveled end face 2331 at one end near the upstream end 201, which constitutes the flared portion. In other embodiments, the flared portion can also be integrally formed with the hollow inner cylinder 22, i.e., formed by expanding outward from one end of the hollow inner cylinder 22. In this embodiment, the heating element 23 is disposed within the airflow space for heating the airflow. In this embodiment, the heating element 23 is disposed outside the hollow inner cylinder 22 and near the upstream end 201. The heating element 23 is located on the side of the handle 1's central axis near the upstream end 201. This design allows the heating element 23 to be closer to the airflow inlet, enabling the heat from the heating element 23 to be quickly carried out by the airflow, thereby reducing heat loss within the hair dryer and improving heating efficiency. Of course, in other embodiments, the heating element 23 can also be set in other locations, such as inside the handle 1. In short, as long as the airflow can be heated in the airflow path, it is acceptable.

[0038] The heating element 23 is disposed inside the hollow air duct 2 and is used to heat the airflow entering the hollow chamber 220, thereby achieving hot air drying of the hair. When in operation, the heating element 23 is connected to a power source via the electrical connector 13. Current flows through the heating element to generate heat, heating the passing airflow. The heated airflow is then blown into the hollow chamber 220 and acts on the hair, achieving rapid drying. In this embodiment, the heating element 23 includes a mounting bracket and a heating wire wound around the mounting bracket. The mounting bracket includes several support plates 231 arranged radially around the circumference of the hollow inner cylinder 22, which support and fix the heating wire. The mounting bracket also includes a fixing inner ring 233 connected to the inner ends of the support plates 231 and a fixing outer ring 232 sleeved on the outer ends of the support plates 231. The fixing inner ring 233 and the fixing outer ring 232 together fix the support plates 231 together, forming a stable mounting structure. In this embodiment, the fixed inner ring 233 has a beveled end face 2331 near the upstream end 201. This beveled end face 2331 cooperates with the guide member 24 to deliver the heated airflow into the hollow inner cylinder 22 and limit its inlet angle. In this embodiment, an airflow inlet 203 is formed between the guide member 24 and the hollow inner cylinder 22. The direction of the airflow through the airflow inlet 203 forms an angle of 30° to 60° with the axial direction of the hollow inner cylinder 22. This design allows the airflow to enter the hollow inner cylinder 22 at a certain angle, forming a more uniform airflow distribution. Preferably, the direction of the airflow through the airflow inlet 203 forms an angle of 45° with the axial direction of the hollow inner cylinder 22. When 45° is used, the combined performance of airflow flow and heat transfer with the hair is optimal.

[0039] Please refer to it again. Figures 1 to 3As shown, the handle 1 is equipped with an operation button 11, which allows the user to control the hair dryer's operating mode, such as turning it on / off, adjusting the fan speed, and adjusting the temperature. An air inlet 12 is located on the handle 1 and is used to draw in outside air, providing an airflow source for the hair dryer. An electrical connector 13 is used to connect to a power source, providing the hair dryer with the necessary electrical energy. The airflow input channel 101 inside the handle 1 communicates with the hollow chamber 220 of the hollow air tube 2. A power source is located within the airflow input channel 101; in this embodiment, the power source is a high-speed brushless motor and its driven fan. When the hair dryer is working, outside air enters the handle 1 through the air inlet 12 and flows into the hollow chamber 220 of the hollow air tube 2 through the airflow input channel 101. During this process, the airflow is heated by the heating element 23, forming hot air, which is then blown out from the downstream end 202 and acts on the hair.

[0040] When in use, the brushless motor drives the fan to rotate, generating airflow. The airflow enters through the air inlet 12 of the handle 1 and flows into the hollow chamber 220 of the hollow air tube 2 through the airflow input channel 101. Inside the hollow air tube 2, the guide 24 directs the airflow towards the upstream end 201, where it is heated by the heating element 23 to form hot air. The airflow then reverses direction and flows back through the airflow inlet 203 into the hollow chamber 220, acting on the hair drawn in by negative pressure to dry it. This hair dryer has two usage modes. When a user needs to perm, straighten, or blow-dry long hair, the user brings the upstream end 201 of the hollow chamber 220 close to the scalp. After opening, outside air enters the airflow input channel 101 through the air inlet 12 on the handle 1, and then flows through the airflow distribution chamber 240 for distribution before passing through the heating element 23 and being heated to an appropriate temperature. Guided by the guide element 24, the airflow first flows towards the upstream end 201, then reverses and blows back into the hollow chamber, and finally out through the hollow chamber 220. During this process, because the upstream end 201 of the hollow chamber 220 is close to the scalp, the hair is drawn into the hollow inner tube 22 for perming, straightening, styling, or drying. Due to the negative pressure formed at the upstream end 201, the hair can be smoothly drawn into the hollow inner tube 22, while the high-temperature airflow heats and styles the hair. When a user needs to blow-dry short hair (long hair is also acceptable), the user can turn the direction of the hollow blower 2 so that the downstream end 202 of the hollow chamber 220 is close to the scalp for blow-drying.

[0041] As can be seen from the above description of the specific embodiments, the hollow air duct 2 and hair dryer of this utility model have the following technical effects. By automatically drawing in hair through negative pressure at the upstream end 201, the user does not need to manually adjust the hair position frequently, which greatly saves time and effort, especially for users with long hair, and reduces hand fatigue. The anti-clogging texture 251 and arc-shaped inward design on the outer surface of the air guide cover 25 can reduce the accumulation and tangling of hair at the inlet, preventing blockage and ensuring the smooth operation of the hair dryer. The air guide 24 changes the airflow direction, causing the airflow to flow towards the upstream end 201 first and then reverse and blow into the hollow cavity 220. Combined with the design of the flared part and the airflow inlet 203, the airflow can more comprehensively and evenly cover the hair, effectively solving the problem of uneven hair drying caused by the single airflow direction of traditional hair dryers, and improving the quality of hair drying.

[0042] This utility model has been described through several specific embodiments. Those skilled in the art should understand that various modifications and equivalent substitutions can be made to this utility model without departing from its scope. Furthermore, various modifications can be made to this utility model for specific situations or circumstances without departing from its scope. Therefore, this utility model is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of this utility model.

Claims

1. A hollow ventilation duct, having a hollow chamber (220), characterized in that, The hollow air duct (2) has an upstream end (201) and a downstream end (202). The airflow is driven by a power source to flow from the upstream end (201) to the downstream end (202) to form a negative pressure at the upstream end (201) to draw hair into the hollow cavity (220). The hollow air duct (2) includes a guide shroud (25) provided at the upstream end (201). The guide shroud (25) is annular, and its outer surface is arc-shaped and inwardly recessed from the outer edge of the annular shape to guide hair into the hollow cavity (220).

2. The hollow ventilation duct as described in claim 1, characterized in that, The outer surface of the flow guide cover (25) is provided with anti-clogging texture (251).

3. The hollow ventilation duct as described in claim 2, characterized in that, The anti-blocking texture (251) is an alternating strip-shaped concave-convex structure or a dot-shaped concave-convex structure.

4. The hollow ventilation duct as described in claim 1, characterized in that, The inner surface of the flow guide cover (25) is provided with a number of radially extending reinforcing ribs (252).

5. The hollow ventilation duct as described in claim 1, characterized in that, The hollow duct (2) includes a shell (21) that is disposed through the upstream end (201) and the downstream end (202), and the flow guide shell (25) is installed on one end of the shell (21) by screws and / or clips.

6. The hollow ventilation duct as described in claim 1, characterized in that, The hollow air duct (2) includes an outer shell (21), and the air guide cover (25) is integrally formed from the outer shell (21).

7. The hollow ventilation duct as described in claim 5 or 6, characterized in that, The hollow air duct (2) includes a hollow inner cylinder (22) disposed inside the outer shell (21) and a flow guide (24) disposed between the hollow inner cylinder (22) and the outer shell (21). The flow guide (24) is configured to guide the airflow to flow towards the upstream end (201) first, and then fold back and blow into the hollow cavity (220).

8. The hollow ventilation duct as described in claim 7, characterized in that, The hollow inner cylinder (22) is provided with a flared part near the upstream end (201), and the inner edge of the flow guide shell (25) is located inside the flared part.

9. The hollow ventilation duct as described in claim 8, characterized in that, The flow guide (24) has an arc-shaped bend (241) near the upstream end (201). The free end of the arc-shaped bend (241) is attached to the inner edge of the flow guide cover (25). An airflow inlet (203) is formed between the free end of the arc-shaped bend (241) and the flared part.

10. A hair dryer, characterized in that, The hair dryer includes a handle (1) and a hollow air duct (2) as described in any one of claims 1-9, wherein the handle (1) is provided with an airflow input channel (101) and the airflow input channel (101) is connected to the hollow chamber (220).

Images