Hair drier air duct with noise reduction air outlet structure and air drier

Abstract

According to the blower air duct with the noise-reduction air outlet structure and the blower, the blower air duct with the noise-reduction air outlet structure adopts the circular air guide column for flow division and the annular air outlet for collaborative noise reduction, turbulent flow and turbulent flow noise are reduced, meanwhile, the annular design of the flow division cavity enables airflow to be evenly distributed along the circumference, and noise is reduced. The annular outlet is further divided into a plurality of strips by the air guide fins, and the air outlet uniformity is ensured by combining the constraint effect of the square annular opening; the gradually-expanding structure between the air channel contraction section and the connecting shell generates a local low-pressure area through sudden change of the cross section, accelerates airflow and increases air pressure. The air duct body of a rod-shaped structure and the turning flow guide part form a compact layout, the air flow path is prolonged, the curvature radius of the turning section of the turning flow guide part is matched with the air flow speed, high-speed air flow is attached to the inner wall through centrifugal force, energy loss is reduced, the air speed of an outlet is increased by 15%-20%, and the beneficial effects of noise reduction, uniform air outlet and air pressure increase are achieved at the same time.

Description

Technical Field

[0001] This utility model relates to the technical field of hair dryer air ducts, and in particular to a hair dryer air duct with a noise reduction air outlet structure and a hair dryer. Background Technology

[0002] In the current field of hair dryer technology, hair dryers are widely used in daily life for drying and styling hair. However, existing hair dryers generally suffer from noise problems. This noise primarily originates from friction between internal components such as bearings and rotors during motor operation, as well as vibrations caused by the motor's electromagnetic force. Simultaneously, airflow within the duct, especially when passing through narrow channels, curved pipes, or encountering obstacles, easily generates turbulence and eddies, thus creating airflow noise. Furthermore, the hair dryer's casing and ductwork, excited by airflow and motor vibrations, may resonate, further increasing noise. This noise not only affects the user experience but also limits the use of hair dryers in noise-sensitive environments. Traditional hair dryer duct structures often employ a straight-tube design, resulting in a short and concentrated airflow path, which easily generates turbulence and high-frequency noise. In addition, uneven airflow distribution at the outlet can lead to insufficient local air pressure, affecting the user experience. While noise reduction designs exist in existing technologies, such as noise-reducing meshes, their noise reduction effect is limited and cannot simultaneously meet the needs of increasing air pressure and airflow while reducing noise. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, this utility model provides a hair dryer duct and hair dryer with a noise reduction air outlet structure, which solves the technical problem that existing traditional hair dryers cannot simultaneously meet the requirements of increasing air pressure and air speed and reducing noise.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a hair dryer duct with a noise reduction air outlet structure, comprising an air inlet, a duct body, and an air outlet, wherein the air outlet is an annular air outlet channel nozzle, the air outlet includes an air duct contraction section and a connecting shell, the air duct contraction section gradually expands along the air outlet direction, the windward part of the air duct contraction section is a cylindrical air guide column, the cylindrical air guide column is coaxial with the air duct contraction section, the windward surface of the cylindrical air guide column is an arc air guide surface, and an annular air outlet is formed between the connecting shell and the air duct contraction section.

[0005] Preferably, the duct body is rod-shaped or thin cylindrical, and the duct body is connected to the air outlet through a turning guide, which is curved in an arc shape.

[0006] Preferably, a guide fin is provided between the connecting shell and the air duct contraction section. The guide fin connects the connecting shell and the air duct contraction section and divides the annular air outlet into multiple strip-shaped air outlets.

[0007] Preferably, the air inlet includes an air inlet filter and an air inlet housing, wherein air inlet holes are evenly or symmetrically arranged on the air inlet housing to balance the airflow input.

[0008] Preferably, the air duct body is provided with a noise reduction honeycomb mesh, which adopts a hexagonal honeycomb structure. The diameter of the honeycomb holes gradually decreases from the air inlet to the air outlet, which is used to reduce mid-to-high frequency noise through the principle of sound wave interference.

[0009] Preferably, the space between the connecting housing and the air duct contraction section is a flow divider cavity, and the air guide fins are disposed in the flow divider cavity.

[0010] Preferably, the air duct contraction section includes a cylindrical air guide column and a diversion cavity air guide section, wherein the diversion cavity air guide section is in the shape of an expanding trumpet and is used for air duct contraction.

[0011] Preferably, the cylindrical air guide column and the air guide section of the diversion cavity are smoothly transitioned by an arc surface.

[0012] Preferably, the connecting shell is a square ring opening, which converges into a square ring opening at the end of the diversion cavity to constrain the airflow pattern; the air duct contraction section is an annular air outlet connected to the square ring opening, with a gradually expanding annular cross-section, which accelerates the airflow through the Venturi effect and reduces eddy noise by utilizing boundary layer adsorption.

[0013] A hair dryer includes a hair dryer duct with a noise-reducing air outlet structure, a PCB board, a motor, and a heating element. The hair dryer duct includes an air inlet, a duct body, and an air outlet. The duct body includes an upper cover and a lower cover, which are fixedly connected by snaps or screws. The air inlet is connected to one end of the duct body by a snap-on structure or a knob structure, and the air outlet is connected to the other end of the duct body by a turning guide.

[0014] Compared with the prior art, the beneficial effects obtained by this utility model are:

[0015] This utility model discloses a hair dryer duct and hair dryer with a noise-reducing air outlet structure. The hair dryer duct with this noise-reducing air outlet structure uses a circular guide column for air diversion and an annular air outlet for coordinated noise reduction. The arc-shaped windward surface at the top of the circular guide column allows airflow to smoothly enter the diversion cavity, reducing turbulence. The guide fins in the diversion cavity divide the central airflow into multiple laminar flows, avoiding turbulent noise caused by airflow collisions. Simultaneously, the annular design of the diversion cavity ensures uniform airflow distribution along the circumference. The guide fins further divide the annular outlet into multiple streams, combined with the constraint effect of the square annular opening, ensuring uniform airflow. The duct's contraction section and connecting... The gradually expanding structure of the flow-dividing cavity formed between the outer shell and the main body generates a local low-pressure zone (Venturi effect) through abrupt changes in cross-section, accelerating airflow and increasing wind pressure. The rod-shaped duct body and the turning guide section form a compact layout, extending the airflow path and increasing heat exchange efficiency. The inner wall of the 90° arc-shaped guide section of the turning guide section can adopt a biomimetic corrugated design to guide the airflow to smoothly turn, suppress turbulence and boundary layer separation, and reduce wind noise by 5-8 dB. The curvature radius of the turning section of the turning guide section is matched with the airflow velocity, using centrifugal force to make the high-speed airflow adhere to the inner wall, reducing energy loss and increasing the outlet wind speed by 15%-20%. Furthermore, a multi-frequency noise reduction honeycomb mesh is used. The hexagonal honeycomb structure of the noise reduction honeycomb mesh divides the airflow into microchannels, generating sound wave reflection and interference through changes in aperture gradient, specifically reducing noise in the 500Hz-5kHz frequency band. By employing the aforementioned technical means, the problem of the conventional blower's air duct structure, which mostly adopts a straight-cylinder design, resulting in a short and concentrated airflow path that easily generates turbulence and high-frequency noise, is solved. This approach simultaneously achieves the beneficial effects of noise reduction, uniform airflow, and increased air pressure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the air outlet structure with noise reduction function of this utility model.

[0018] Figure 2 This is a cross-sectional view (AA) of the air outlet structure with noise reduction function of this utility model.

[0019] Figure 3 This is a BB cross-sectional view of the air outlet structure with noise reduction function of this utility model.

[0020] Figure 4 This is a schematic diagram of the turning guide section of the hair dryer of this utility model.

[0021] Figure 5 This is a CC cross-sectional view of the turning guide section of the hair dryer of this utility model.

[0022] Figure 6 This is an exploded view of the hair dryer of this utility model.

[0023] Reference numerals: 1-Air inlet; 2-Main body of air duct; 21-Upper cover; 22-Lower cover; 3-Air outlet; 31-Air duct contraction section; 311-Cylindrical air guide column; 312-Air guide section of diversion cavity; 32-Connecting outer shell; 33-Air guide fins; 4-Turn guide section; 41-Upper connecting outer shell; 5-Noise reduction honeycomb mesh; 6-PCB board; 7-Motor; 8-Heating frame. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please refer to Figures 1 to 6 A hair dryer includes a hair dryer duct, a PCB board 6, a motor 7, and a heating element 8. The hair dryer duct comprises an air inlet 1, a duct body 2, and an air outlet 3. The duct body 2 is a thin cylindrical straight tube, including an upper cover 21 and a lower cover 22, which are fixed together by precision snaps and screws. The air inlet 1 is connected to one end of the duct body 2 via a snap-fit ​​or knob-type structure. The air outlet 3 is connected to the other end of the duct body 2 via a turning guide 4. The turning guide 4 adopts a streamlined inner wall design with a 90° bend to reduce airflow separation and turbulence generation. The motor 7 is connected to the inner wall of the duct body 2 via an aluminum alloy bracket. The aluminum alloy bracket uses shock-absorbing rubber pads to reduce operating vibration. The output shaft of the motor 7 is connected to the centrifugal impeller via a spline connection to ensure efficient and stable power transmission. The heating frame 8 is a spiral heating frame. The heating frame 8 and the motor 7 are arranged in sequence along the airflow direction during operation. The heating frame 8 is located in the air outlet direction of the motor 7 and heats the airflow evenly through the spiral guide groove.

[0026] The air inlet 1 includes an air inlet filter and an air inlet housing. The air inlet housing is uniformly provided with an air inlet through-hole matrix to balance the airflow input. The air inlet filter is a multi-layer composite filter to filter impurities and initially stabilize the airflow. The air inlet filter is fixed to the inside of the air inlet housing by a rotating buckle, which supports quick disassembly and cleaning. The air inlet housing and the air duct body 2 are quickly disassembled and assembled by a buckle or magnetic attachment.

[0027] The interior of the air duct body 2 is equipped with a noise-reducing honeycomb mesh 5, which adopts a hexagonal honeycomb structure. The diameter of the honeycomb holes gradually decreases from the air inlet to the air outlet, which is used to reduce mid-to-high frequency noise through the principle of sound wave interference. The noise-reducing honeycomb mesh 5 is made of polyimide material, formed by laser cutting, and embedded in the annular groove of the air duct body 2 near the air outlet 3. The space between the noise-reducing honeycomb mesh 5 and the annular groove is filled with high-temperature resistant silicone, which both fixes the position and absorbs vibration noise.

[0028] The air outlet 3 includes a duct contraction section 31 and a connecting shell 32. The duct contraction section 31 gradually expands along the air outlet direction. The duct contraction section 31 includes a cylindrical air guide column 311 and a diversion cavity air guide section 312. The diversion cavity air guide section 312 is in the shape of an expanding trumpet. The cylindrical air guide column 311 is the windward part of the duct contraction section 31. The cylindrical air guide column 311 and the diversion cavity air guide section 312 are coaxial. The windward surface of the cylindrical air guide column 311 is an arc-shaped air guide surface. The arc-shaped air guide surface and the cylindrical surface of the cylindrical air guide column 311 are smoothly connected. An annular air outlet is formed between the connecting shell 32 and the air outlet end of the diversion cavity air guide section 312. A guide fin 33 is provided between the connecting housing 32 and the air duct contraction section 31. The guide fin 33 connects the connecting housing 32 and the air duct contraction section 31, and divides the annular air outlet into multiple strip-shaped air outlets. A flow divider cavity exists between the connecting housing 32 and the air duct contraction section 31, and the guide fin 33 is disposed within this flow divider cavity. The height of the guide fin 33 is less than the height of the connecting housing 32.

[0029] Furthermore, the cylindrical air guide column 311 and the air guide section 312 of the diversion cavity are smoothly transitioned by an arc surface. The connecting shell 32 is a square ring opening, which converges into a square ring opening at the end of the diversion cavity to constrain the airflow pattern. The air duct contraction section 31 is an annular air outlet connected to the square ring opening. The cross-section is a gradually expanding annular shape, which accelerates the airflow through the Venturi effect and reduces eddy noise by using boundary layer adsorption. The end of the turning guide section 4 is an upper connecting shell 41 with a horn-shaped opening. The upper shell and the connecting shell 32 are fixedly connected by a snap-fit ​​structure or fastening screws.

[0030] Furthermore, the upper cover 21 and the lower cover 22 are specifically fixedly connected by the following structure: First, snap-fit ​​positioning: high-precision slots are set on the edges of the upper and lower covers to ensure component alignment during assembly. Second, screw reinforcement: 4-6 sets of stainless steel self-tapping screws are evenly distributed along the axial direction of the outer shell of the air duct body 2 to enhance overall rigidity. Silicone sealing rings are embedded at the seams of the outer shell of the air duct body 2 to prevent airflow leakage and external dust intrusion.

[0031] Furthermore, the interface between the air inlet of the air inlet 2 and the air outlet of the air outlet 3 adopts an interference fit design to ensure that there is no turbulence interference in the airflow path.

[0032] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and many similar modifications are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this utility model should be considered within the scope of protection of this utility model.

Claims

1. A hair dryer duct with a noise-reducing air outlet structure, characterized in that, It includes an air inlet (1), a duct body (2) and an air outlet (3). The air outlet (3) is an annular air outlet duct nozzle. The air outlet (3) includes a duct contraction section (31) and a connecting shell (32). The duct contraction section (31) gradually expands along the air outlet direction. The windward part of the duct contraction section (31) is a cylindrical air guide column (311). The cylindrical air guide column (311) is coaxial with the duct contraction section (31). The windward surface of the cylindrical air guide column (311) is an arc air guide surface. An annular air outlet is formed between the connecting shell (32) and the duct contraction section (31).

2. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 1, characterized in that, The main body of the air duct (2) is rod-shaped or thin cylindrical. The main body of the air duct (2) and the air outlet (3) are connected by a turning guide (4), which is curved in an arc.

3. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 1, characterized in that, A guide fin (33) is provided between the connecting shell (32) and the air duct contraction section (31). The guide fin (33) connects the connecting shell (32) and the air duct contraction section (31) and divides the annular air outlet into multiple strip-shaped air outlets.

4. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 1, characterized in that, The air inlet (1) includes an air inlet filter and an air inlet housing. The air inlet housing is provided with air inlet holes evenly or symmetrically to balance the airflow input.

5. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 1, characterized in that, The air duct body (2) is provided with a noise reduction honeycomb mesh (5), which adopts a hexagonal honeycomb structure and the diameter of the honeycomb holes gradually decreases from the air inlet end to the air outlet end.

6. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 3, characterized in that, The connecting shell (32) and the air duct contraction section (31) form a flow divider cavity, and the air guide fins (33) are disposed in the flow divider cavity.

7. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 1, characterized in that, The air duct contraction section (31) includes a cylindrical air guide column (311) and a diversion cavity air guide part (312). The diversion cavity air guide part (312) is in the shape of an expanding trumpet and is used for air duct contraction.

8. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 7, characterized in that, The cylindrical air guide column (311) and the air guide part of the diversion cavity (312) are smoothly transitioned by an arc surface.

9. The air duct of the hair dryer with a noise-reducing air outlet structure as described in claim 1, characterized in that, The connecting shell (32) is a square ring opening, which is constricted into a square ring opening at the end of the diversion cavity to constrain the airflow pattern; the air duct contraction section (31) is an annular air outlet connected to the square ring opening, with a gradually expanding annular cross section, which accelerates the airflow through the Venturi effect and reduces eddy noise by utilizing boundary layer adsorption.

10. A hair dryer, characterized in that, The hairdryer includes a noise-reducing air outlet structure as described in any one of claims 1 to 9, a PCB board (6), a motor (7), a heating element (8), and the hairdryer air outlet includes an air inlet (1), an air outlet body (2), and an air outlet (3). The air outlet body (2) includes an upper cover (21) and a lower cover (22), which are fixedly connected by snaps or screws. The air inlet (1) is connected to one end of the air outlet body (2) by a snap-on structure or a knob structure, and the air outlet (3) is connected to the other end of the air outlet body (2) by a turning guide (4).

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