Hair drier capable of reducing noise

Abstract

The utility model discloses an air blower capable of reducing noise, relates to the technical field of air blowers, and aims to solve the technical problem that the noise is high when the air blower blows air. The blower capable of reducing noise comprises a blower body, the blower body is provided with an air outlet, the blower body is used for outputting airflow through the air outlet, the blower capable of reducing noise further comprises a noise reduction assembly, and the noise reduction assembly is detachably connected to the end, provided with the air outlet, of the blower body; the noise reduction assembly comprises a noise reduction air duct which communicates with the air outlet. The width of the air outlet of the noise reduction air duct is larger than that of the air outlet. Therefore, the blower has the advantages that the air outlet noise of the blower is reduced, and the user experience is improved.

Description

Technical Field

[0001] This application relates to the technical field of hair dryers, and more specifically, to a noise-reducing hair dryer. Background Technology

[0002] Hair dryers are common small electrical appliances, primarily used for drying hair. Most existing high-speed hair dryers use a motor to drive the fan blades at high speed to draw in a large amount of air, heat the air, and then expel it through the outlet to achieve high-speed airflow. However, during this high-speed airflow process, the air velocity inside the hair dryer and at the outlet is relatively high, resulting in a significant pressure difference between the internal and external air pressures.

[0003] The width of the air duct inside the hair dryer typically narrows near the outlet. Airflow travels along the inner wall of the duct until it converges at the outlet, where the air velocity is high. If this air were directly discharged into the outside environment, the Coanda effect would cause a sharp increase in the pressure difference at the outlet. Since the airflow continues along its original path without diffusion, it easily adheres to the area near the outlet, creating turbulence. Eddies within this turbulence continuously detach, forming a series of small vortices. These vortices vibrate during their detachment, and these vibrations are transmitted into the surrounding air, generating significant noise. Furthermore, the turbulence causes interaction between the airflow and the outlet structure, further increasing the noise. Therefore, the hair dryer will exhibit a whistling sound during operation.

[0004] Therefore, designing a noise-reducing hair dryer has become a key research direction and topic in the hair dryer industry. Utility Model Content

[0005] The purpose of this application is to provide a noise-reducing hair dryer that can alleviate the technical problem of excessive noise when the air is blown out, reduce the noise when the hair dryer blows air, and improve the user experience.

[0006] The embodiments of this application are implemented as follows:

[0007] In a first aspect, this application provides a noise-reducing hair dryer, including a fan body with an air outlet, the fan body being used to output airflow through the air outlet, the noise-reducing hair dryer also including a noise-reducing component, the noise-reducing component being detachably connected to the end of the fan body with the air outlet; the noise-reducing component including a noise-reducing air duct, the noise-reducing air duct being connected to the air outlet; the width of the air outlet of the noise-reducing air duct being greater than the width of the air outlet.

[0008] In the above technical solution, a detachable noise reduction component is installed at the air outlet of the hair dryer, which is convenient for users to install and remove as needed, making it more convenient for users to use and easy to clean, maintain and place the hair dryer and the noise reduction component. The width of the air outlet of the noise reduction duct is larger than the width of the air outlet of the hair dryer, which increases the cross-sectional area and reduces the gas velocity during the air output process. When the airflow is output through the noise reduction duct, it can be gradually diffused and smoothed, reducing the adhesion and turbulence of the airflow at the air outlet, thereby effectively reducing noise.

[0009] In some embodiments, the end of the noise-reducing duct that connects to the air outlet is the air inlet, and the width of the air inlet of the noise-reducing duct is greater than the width of the air outlet. In the above technical solution, the width of the air inlet is greater than the width of the air outlet, which reduces turbulence at the connection between the air inlet and the air outlet, disperses the airflow to reduce the direct impact of the airflow on the air inlet of the noise-reducing duct, and makes the airflow more evenly distributed when entering the noise-reducing duct, thereby improving airflow stability and reducing noise.

[0010] In some embodiments, the width of the noise-reducing duct is constant from the air inlet to the air outlet; the ratio of the width of the noise-reducing duct to the width of the air outlet is 1.1 to 1.5. In the above technical solution, the width of the noise-reducing duct is larger than the width of the air outlet, which reduces the wind speed in the noise-reducing duct. After the airflow is discharged from the air outlet, it diffuses in the noise-reducing duct, which can reduce the adhesion of airflow at the air outlet, stabilize the gas flow, and reduce noise. The constant width of the noise-reducing duct ensures that the airflow is evenly distributed in the noise-reducing duct, reduces the generation of turbulence in the noise-reducing duct, improves the structural stability of the noise-reducing component, makes the gas flow smoother, and reduces noise. The width ratio of 1.1 to 1.5 can reduce the probability of abrupt changes in wind speed at the junction of the air outlet and the air inlet, which can generate a large amount of turbulence, improve the situation of excessively low output wind speed of the noise-reducing duct, and improve the air quality and noise reduction effect of the blower.

[0011] In some embodiments, the width of the noise-reducing air duct gradually increases from the air inlet to the air outlet. In the above technical solution, the width of the noise-reducing air duct gradually increases along the airflow output direction, and the outlet pressure gradually decreases, which further reduces the gas flow velocity to improve the noise reduction effect; the gradually increasing width of the noise-reducing air duct can also reduce the pressure loss when the airflow passes through the noise-reducing air duct and improve the airflow transmission efficiency; the gradually increasing width of the noise-reducing air duct can also be used to provide a larger air volume to improve the airflow quality of the blower.

[0012] In some embodiments, the noise reduction component includes a guide housing and a first housing sleeved outside the guide housing, and the noise reduction duct is formed by the first housing and the guide housing; from the air inlet to the air outlet, the guide housing is radially recessed and arc-shaped relative to the first housing. In the above technical solution, the radially recessed and arc-shaped guide housing causes the airflow to gradually slow down within the noise reduction duct, reducing abrupt changes and irregular movements of the airflow within the noise reduction duct, thereby reducing turbulence and effectively reducing noise; in addition, the radially recessed guide housing causes the airflow to converge at the same point when it is discharged outward, which is beneficial for the hair dryer to concentrate the airflow, thereby improving the airflow quality of the hair dryer.

[0013] In some embodiments, the noise reduction duct includes a connecting section and an outlet section that are interconnected, with the connecting section connected to the air outlet. Along the air outlet direction of the noise reduction duct, the width of the connecting section gradually increases, while the width of the outlet section remains constant. In the above technical solution, the setting of gradually increasing and then maintaining a constant width in the noise reduction duct is beneficial for guiding the airflow to diffuse smoothly and evenly within the duct, reducing turbulence, lowering noise, and also reducing fluctuations in airflow velocity, thus improving the situation where the output airflow velocity of the noise reduction duct is too low.

[0014] In some embodiments, the noise reduction component further includes a noise reduction cavity, the extension direction of which is consistent with the extension direction of the noise reduction duct, and the noise reduction cavity and the noise reduction duct are separated by a first housing; the first housing is provided with a plurality of uniformly arranged noise reduction holes, and the noise reduction cavity and the noise reduction duct are connected through the noise reduction holes. In the above technical solution, the arrangement of the noise reduction cavity and the noise reduction holes enables resonance at a specified frequency when the airflow passes through. Accordingly, the noise reduction cavity can absorb noise with a similar or the same resonance frequency through resonance, thereby achieving high-quality noise reduction; in addition, the uniformly arranged noise reduction holes enable the airflow and sound waves to be evenly distributed when passing through the holes, alleviating the local stress concentration of the noise reduction component due to airflow passing through, reducing airflow speed changes, and further reducing noise.

[0015] In some embodiments, the noise reduction cavity includes a first noise reduction cavity and a second noise reduction cavity that are independent of each other, and the first noise reduction cavity and the second noise reduction cavity are arranged along the extension direction of the noise reduction air duct; the perforation rate corresponding to the noise reduction hole communicating with the first noise reduction cavity is less than the perforation rate corresponding to the noise reduction hole communicating with the second noise reduction cavity. In the above technical solution, the noise reduction component achieves noise absorption of multiple different frequencies or even different frequency bands through multiple noise reduction cavities that are independent of each other and have different perforation rates, thereby improving the overall noise reduction effect.

[0016] In some embodiments, the noise reduction component further includes a sound-absorbing element disposed within the noise reduction cavity and attached to the side of the noise reduction cavity near the noise reduction hole. In the above technical solution, the noise reduction cavity and the sound-absorbing element within the noise reduction cavity form an impedance composite silencer, which can effectively absorb components of various frequencies in the noise; the sound-absorbing cotton can also prevent heat conduction, thereby slowing down the temperature rise rate of the noise reduction component housing and making the temperature rise lower; in addition, the sound-absorbing element is attached to the side of the noise reduction cavity near the noise reduction hole, which is beneficial for directly absorbing sound waves entering the noise reduction cavity through the noise reduction hole, reducing the reflection and propagation of sound waves within the noise reduction cavity, maximizing its sound absorption effect, and improving the noise reduction quality of the noise reduction component.

[0017] In some embodiments, the noise reduction duct is an annular duct, and the noise reduction component further includes multiple partition ribs, each partition rib being arranged within the noise reduction duct along its extension direction; the multiple partition ribs are evenly distributed around the axis of the noise reduction duct to divide it into multiple sub-ducts. In the above technical solution, the partition ribs divert the gas exiting the outlet, which reduces the mutual interference between airflows of different regions and velocities within the noise reduction duct, thereby reducing turbulence, making the gas flow smoother, and effectively reducing noise; the annular duct design increases the attenuation distance of noise waves, further reducing noise; the circumferentially evenly distributed partition ribs make the airflow diffusion and sound wave transmission within each sub-duct more uniform, thereby improving the overall noise reduction effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional schematic diagram illustrating a noise-reducing hair dryer according to some embodiments of this application;

[0020] Figure 2 This is a partial cross-sectional schematic diagram illustrating a noise-reducing hair dryer according to some embodiments of this application;

[0021] Figure 3 This is a partial cross-sectional schematic diagram illustrating a noise-reducing hair dryer according to other embodiments of this application;

[0022] Figure 4 This is a cross-sectional schematic diagram illustrating a noise-reducing hair dryer according to some embodiments of this application;

[0023] Figure 5 This is a schematic cross-sectional view of the noise reduction components shown in some embodiments of this application;

[0024] Figure 6 This is a schematic cross-sectional view of the noise reduction component shown in some other embodiments of this application;

[0025] Figure 7 This is a schematic cross-sectional view of a noise reduction assembly with sound-absorbing elements shown in some embodiments of this application;

[0026] Figure 8 This is an exploded view of a noise reduction component shown in some embodiments of this application;

[0027] Figure 9 This is a side view schematic diagram illustrating a noise-reducing hair dryer according to some embodiments of this application.

[0028] Icons: 1-Hair dryer; 10-Blower body; 100-Air outlet; 2-Noise reduction component; 20-Noise reduction air duct; 201-Air inlet; 202-Air outlet; 203-Connecting flow section; 204-Outlet flow section; 3-Magnetic suction component; 21-First housing; 210-Accommodation cavity; 22-Second housing; 23-Guide housing; 230-Separating rib; 231-Snap-fit ​​protrusion; 24-Noise reduction cavity; 240-Noise reduction hole; 241-First noise reduction cavity; 242-Second noise reduction cavity; 25-Cover plate; 251-Snap-fit ​​groove; 26-Sound absorption component. Detailed Implementation

[0029] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.

[0033] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0034] Please refer to Figure 1 , Figure 1 This is a cross-sectional schematic diagram illustrating a noise-reducing hair dryer 1 according to some embodiments of this application. For example... Figure 1 As shown, this application provides a noise-reducing hair dryer 1, including a fan body 10 and a noise-reducing component 2. The fan body 10 has an air outlet 100 through which it outputs a high-speed airflow. The noise-reducing component 2 is detachably connected to the end of the fan body 10 with the air outlet 100, i.e., a noise-reducing duct 20 is located in the extension section of the air outlet 100 of the hair dryer 1; the noise-reducing component 2 includes a noise-reducing duct 20, which communicates with the air outlet 100. The width D2 of the air outlet of the noise-reducing duct 20 is greater than the width D0 of the air outlet.

[0035] In this embodiment, the fan body 10 generally refers to the main body of the blower 1, which is capable of generating and outputting high-speed airflow. The fan body 10 typically includes a motor, a fan, and a housing. The motor and fan are located inside the housing. The fan body 10 drives the fan to rotate via the motor, thereby generating high-speed airflow. The air outlet 100 refers to the location on the fan body 10 where the airflow is finally discharged. In some embodiments, the width of the internal air duct of the fan body 10 gradually narrows near the air outlet 100, and the airflow travels along the inner wall of the air duct until it converges at the air outlet 100 to output high-speed airflow. The noise reduction component 2 refers to an independent component that can be connected to the fan body 10. The noise reduction component 2 is mainly used to reduce the noise level of the blower 1 during operation. The noise reduction duct 20 is part of the noise reduction component 2 and is used to guide the airflow discharged from the air outlet 100. The air outlet 202 is the end of the noise reduction duct 20. The airflow input into the noise reduction duct 20 via the air outlet 100 is finally discharged from the air outlet 202.

[0036] In the above technical solution, a detachable noise reduction component 2 is provided at the air outlet 100 of the hair dryer 1, which is convenient for users to install and remove as needed, making it more convenient for users to use and easy to clean, maintain and place the hair dryer 1 and the noise reduction component 2. The air outlet width D2 of the noise reduction air duct 20 is greater than the air outlet width D0 of the hair dryer 1, which increases the cross-sectional area and reduces the gas velocity during the air output process. When the airflow is output through the noise reduction air duct 20, it can be gradually diffused and smoothed, reducing the adhesion and turbulence of the airflow at the air outlet 202, thereby effectively reducing noise.

[0037] Please see Figure 2 , Figure 2 This is a partial cross-sectional schematic diagram illustrating a noise-reducing hair dryer 1 according to some embodiments of this application. Please refer to... Figures 1 to 2 As shown, the end of the noise reduction duct 20 that connects to the air outlet 100 is the air inlet 201. The width D1 of the air inlet of the noise reduction duct 20 can also be greater than the width D0 of the air outlet of the fan body 10.

[0038] According to the flow continuity equation V1A1=V2A2, when the airflow passes through different cross-sections, if the cross-sectional area changes, the gas velocity will also change accordingly. In this embodiment, the width D1 of the air inlet is larger than the width D0 of the air outlet, indicating that the cross-sectional area of ​​the air inlet 201 is larger than that of the air outlet 100. When the gas is discharged through the air outlet 100 and enters the noise reduction duct 20 through the air inlet 201, the wind speed will decrease. According to Bernoulli's principle, the wind speed decreases when the airflow leaves the air outlet 100 and enters the noise reduction duct 20, the Coanda effect will be weakened accordingly, thereby reducing the adhesion of the airflow at the air outlet 100, reducing turbulence, making the gas flow more stable, and reducing noise.

[0039] In the above technical solution, the inlet width D1 is greater than the outlet width D0, which reduces the airflow velocity at the inlet 201. The larger inlet width helps to balance the pressure distribution of the airflow entering the noise reduction duct 20, reducing the formation of localized high-pressure areas. Consequently, turbulence is reduced at the junction of the inlet 201 and the outlet 100. This technical solution disperses the airflow and reduces the direct impact of the airflow on the inlet 201 of the noise reduction duct 20, allowing for a more uniform airflow distribution upon entering the noise reduction duct 20, improving airflow stability, and reducing noise.

[0040] In some embodiments, the width D of the noise reduction duct from the air inlet 201 to the air outlet 202 is constant, and the ratio of the width D of the noise reduction duct to the width D0 of the air outlet can be 1.1 to 1.5.

[0041] In the above technical solution, the width D of the noise reduction duct is larger than the width D0 of the air outlet, which reduces the wind speed within the noise reduction duct 20. After the airflow is discharged from the air outlet 100, it diffuses within the noise reduction duct 20, which reduces the adhesion of the airflow at the air outlet 100, stabilizes the gas flow, and reduces noise. The constant width D of the noise reduction duct ensures that the gas is evenly distributed and flows within the noise reduction duct 20, reduces turbulence within the noise reduction duct 20, improves the structural stability of the noise reduction component 2, makes the gas flow smoother, and reduces noise. The width ratio is 1.1 to 1.5, which reduces the probability of abrupt changes in wind speed at the junction of the air outlet 100 and the air inlet 201, thus generating a large amount of turbulence. It also improves the situation where the output wind speed of the noise reduction duct 20 is too low, and improves the air quality and noise reduction effect of the blower 1.

[0042] Please see Figure 3 , Figure 3 This is a partial cross-sectional schematic diagram illustrating a noise-reducing hair dryer 1 according to other embodiments of this application. Please refer to... Figures 1 to 3 As shown, the noise reduction duct 20 may include a connecting section 203 and a discharge section 204 that are interconnected. The connecting section 203 is connected to the air outlet 100, meaning it is the section of the noise reduction duct 20 that is directly connected to and adjacent to the air outlet 100. The discharge section 204 and the air outlet 100 are located at opposite ends of the connecting section 203. The end of the connecting section 203 closest to the air outlet 100 is the air inlet 201, and the end of the discharge section 204 furthest from the air outlet 100 is the air outlet 202. Along the air outlet direction A of the noise reduction duct 20, the width of the connecting section 203 can gradually increase, while the width of the discharge section 204 can remain constant.

[0043] Furthermore, at least one inner wall of the connecting flow section 203 can have an arc-shaped transition, and the width of the flow section gradually increases along the air outlet direction A of the noise reduction duct 20; or, the inner wall of the connecting flow section 203 can have a single straight transition or multiple straight transitions, and the width of the flow section gradually increases along the air outlet direction A of the noise reduction duct 20. Furthermore, the width D1 of the air inlet in the connecting flow section 203 can be equal to the width D0 of the air outlet; or, the width D1 of the air inlet in the connecting flow section 203 can be greater than the width D0 of the air outlet.

[0044] In the above technical solution, the width D of the noise reduction duct is gradually increased and then kept constant, which helps to guide the airflow to diffuse smoothly and evenly in the noise reduction duct 20 and then be discharged smoothly, making it less likely to form turbulence, effectively reducing noise, and also reducing the fluctuation of airflow speed, thus improving the situation where the output wind speed of the noise reduction duct 20 is too low.

[0045] Please see Figure 4 , Figure 4This is a cross-sectional schematic diagram illustrating a noise-reducing hair dryer 1 according to some embodiments of this application. For example... Figure 4 As shown, the noise reduction component 2 includes a flow guide housing 23 and a first housing 21 sleeved outside the flow guide housing 23. The noise reduction air duct 20 is formed by the first housing 21 and the flow guide housing 23. The width D of the noise reduction air duct gradually increases from the air inlet 201 to the air outlet 202.

[0046] In the above technical solution, the width D of the noise-reducing duct gradually increases along the airflow output direction, which gradually reduces the outlet pressure when the airflow exits the noise-reducing component 2, and the gas flow velocity can be further gradually reduced, thereby improving the noise reduction effect of the noise-reducing component 2. The gradually increasing width of the noise-reducing duct 20 can also reduce the pressure loss when the airflow passes through the noise-reducing duct 20, and improve the airflow transmission efficiency; the gradually increasing width of the noise-reducing duct 20 can also be used to provide a larger air volume to improve the air output quality of the blower 1.

[0047] In some embodiments, from the air inlet 201 to the air outlet 202, the guide housing 23 may be radially recessed relative to the first housing 21 and have an arc-shaped transition. In other embodiments, from the air inlet 201 to the air outlet 202, the guide housing 23 may be radially recessed relative to the first housing 21 and have a straight transition. In still other embodiments, the first housing 21 may also be radially expanded relative to the axis of the noise reduction component 2 and have a straight or arc-shaped transition. Further, the width D1 of the air inlet may be equal to the width D0 of the air outlet; or, the width D1 of the air inlet may be greater than the width D0 of the air outlet.

[0048] In the above technical solution, the airflow guide housing 23 is radially inward and arc-shaped, which makes the airflow gradually slow down in the noise reduction duct 20, thereby reducing the sudden changes and irregular movements of the airflow in the noise reduction duct 20, reducing turbulence and effectively reducing noise; in addition, the radially inward airflow guide housing 23 makes the airflow converge in the same direction when it is discharged outward, which is conducive to the concentrated air output of the blower 1, thereby improving the air output quality and drying efficiency of the blower 1.

[0049] Please see Figure 5 , Figure 5 This is a schematic cross-sectional view of the noise reduction component 2 shown in some embodiments of this application. Figure 5 As shown, the noise reduction component 2 may include a flow guide housing 23, a first housing 21 sleeved outside the flow guide housing 23, and a second housing 22 sleeved outside the first housing 21. The noise reduction duct 20 may be formed by the first housing 21 and the flow guide housing 23, and the noise reduction cavity 24 may be formed by the first housing 21 and the second housing 22. The noise reduction cavity 24 and the noise reduction duct 20 are separated by the first housing 21.

[0050] Specifically, at least one end of the second housing 22 can be bent toward the first housing 21 and connected to (or integrally formed with) the first housing 21 to form a closed noise reduction cavity 24. Furthermore, at least one end of the second housing 22 and the first housing 21 can be sealed together by a cover plate 25 to form an independent noise reduction cavity 24; further still, at least one partition can be provided between the second housing 22 and the first housing 21 to divide multiple independent noise reduction cavities 24 circumferentially or axially.

[0051] In some embodiments, the extending direction of the noise reduction cavity 24 may be consistent with the extending direction of the noise reduction duct 20. The first housing 21 may be provided with a plurality of uniformly arranged noise reduction holes 240, and the noise reduction cavity 24 and the noise reduction duct 20 are connected through the noise reduction holes 240.

[0052] Please combine Figure 5 , Figure 6 As shown in the embodiment of this application, the multiple noise reduction holes 240 connected to each noise reduction cavity 24 are uniformly arranged. The aperture of the noise reduction hole 240 is d, the perforation rate of the multiple noise reduction holes 240 connected to each noise reduction cavity 24 on the first housing 21 is p, the wall thickness of the first housing 21 (which can also be understood as the hole depth of the noise reduction hole 240) is t, and the thickness of the air layer in the noise reduction cavity 24 is L. Then the resonant sound absorption frequency f0 of the noise reduction cavity 24 is as follows (1):

[0053]

[0054] For example, when the aperture d of the noise reduction hole 240 is 1mm, the hole depth t is 1.5mm, the perforation rate p is 0.8%, and the air layer thickness L is 6mm, the resonant absorption frequency f0 of the noise reduction cavity 24 is 1360Hz, which is consistent with the frequency of the higher noise value of the hair dryer 1. The noise reduction cavity 24 can absorb noise of similar and the same frequency through resonance, thus achieving effective noise reduction.

[0055] In the above technical solution, the arrangement of the noise reduction cavity 24 and the noise reduction hole 240 makes the noise reduction component 2 a micro-perforated plate silencer, which can achieve resonance at a specified frequency when the airflow passes through. Correspondingly, the noise reduction cavity 24 can absorb noise with a similar or the same resonance frequency through resonance, thereby achieving high-quality noise reduction. In addition, the uniformly arranged noise reduction holes 240 can also distribute the airflow and sound waves evenly when passing through the holes, alleviate the local stress concentration of the noise reduction component 2 due to the airflow, reduce airflow speed fluctuations, and further reduce noise.

[0056] Furthermore, the multiple noise reduction holes 240 on the first housing 21 can be aligned horizontally and vertically and arranged evenly, or the multiple noise reduction holes 240 on the first housing 21 can be arranged in an alternating manner evenly, or the hole diameter or hole spacing of the multiple noise reduction holes 240 on the first housing 21 can be set in a gradient.

[0057] Please see Figure 6 , Figure 6 This is a schematic cross-sectional view of the noise reduction component 2 as shown in other embodiments of this application. Please refer to... Figures 5 to 6 As shown, the noise reduction cavity 24 may include a first noise reduction cavity 241 and a second noise reduction cavity 242 that are independent of each other. The first noise reduction cavity 241 and the second noise reduction cavity 242 can be separated by a partition and are arranged sequentially along the extension direction of the noise reduction air duct 20. Specifically, the perforation rate corresponding to the noise reduction hole 240 communicating with the first noise reduction cavity 241 is less than the perforation rate corresponding to the noise reduction hole 240 communicating with the second noise reduction cavity 242.

[0058] For example, the aperture spacing b1 of the multiple noise reduction holes 240 connected to the first noise reduction cavity 241 is greater than the aperture spacing b2 of the multiple noise reduction holes 240 connected to the second noise reduction cavity 242. That is, the multiple noise reduction holes 240 connected to the first noise reduction cavity 241 are more sparsely arranged, resulting in a lower perforation rate p1; while the multiple noise reduction holes 240 connected to the second noise reduction cavity 242 are more densely arranged, resulting in a higher perforation rate p2. Specifically, if the aperture d of the multiple noise reduction holes 240 connected to the first noise reduction cavity 241 and the second noise reduction cavity 242 are equal, but the aperture spacing is unequal, and the air layer thickness L in the first noise reduction cavity 241 and the second noise reduction cavity 242 are equal, then the perforation rate p1 of the first noise reduction cavity 241 and the perforation rate p2 of the second noise reduction cavity 242 are unequal. The resonant absorption frequency f1 of the first noise reduction cavity 241 can be 1360Hz, and the resonant absorption frequency f2 of the second noise reduction cavity 242 can be 1700Hz.

[0059] In the above technical solution, the noise reduction component 2 uses multiple noise reduction cavities 24 that are independent of each other and have different perforation rates to achieve noise absorption at multiple different frequencies or even different frequency bands, thereby improving the overall noise reduction effect. Specifically, with other dimensional parameters remaining constant and identical, different hole spacings can achieve different perforation rates, thus achieving different resonant sound absorption frequencies or resonant sound absorption bands. In addition, regardless of how many noise reduction ducts 20 or noise reduction cavities 24 are divided circumferentially, the airflow in each noise reduction sub-duct will sequentially pass through the first noise reduction cavity 241 and the second noise reduction cavity 242, and even sequentially through more noise reduction cavities 24 with different resonant sound absorption frequencies, achieving sound absorption and noise reduction at multiple frequency bands, resulting in a better overall noise reduction effect of the noise reduction component.

[0060] Please see Figure 7 , Figure 7This is a schematic cross-sectional view of a noise reduction assembly 2 equipped with a sound-absorbing element 26, as shown in some embodiments of this application. Figure 7 As shown, the noise reduction component 2 may also include a sound-absorbing component 26, which is disposed in the noise reduction cavity 24 and attached to the side of the noise reduction cavity 24 near the noise reduction hole 240, that is, attached to the first housing 21.

[0061] In this embodiment, the sound-absorbing component 26 can be a porous sound-absorbing cotton made of a specified material. The porous sound-absorbing cotton, together with the noise reduction cavity 24 and the noise reduction hole 240, constitutes an impedance-type silencer to improve the overall noise reduction performance of the noise reduction component 2. Specifically, the sound-absorbing cotton material can be melamine, polyester fiber, polyurethane, or other sound-absorbing materials. The noise levels measured when the noise reduction component 2 outputs high-speed airflow with porous sound-absorbing cotton made of different materials are shown in Table (1) below. The noise level reduction can reach up to nearly 3 dB(A).

[0062] In the above technical solution, the cooperation between the noise reduction cavity 24 and the noise reduction hole 240 can effectively absorb the low- and mid-frequency components of noise; the sound-absorbing cotton inside the noise reduction cavity 24 can effectively absorb the mid- and high-frequency components of noise. The noise reduction cavity 24, the noise reduction hole 240, and the sound-absorbing component 26 inside the noise reduction cavity 24 together form an impedance composite silencer, which can effectively absorb components of various frequencies in noise; the sound-absorbing cotton can also prevent heat conduction and isolate heat transfer, thereby slowing down the temperature rise rate of the noise reduction component 2 shell and making the temperature rise lower; in addition, the sound-absorbing component 26 is attached to the side of the noise reduction cavity 24 near the noise reduction hole 240, which is conducive to directly absorbing the sound waves entering the noise reduction cavity 24 through the noise reduction hole 240, reducing the reflection and propagation of sound waves in the noise reduction cavity 24, maximizing the sound absorption effect, and improving the noise reduction quality of the noise reduction component 2.

[0063] Table (1)

[0064] Air nozzle embedded material Nozzle type Nozzle length Sound power dB(A) polyurethane short 36mm 75.7 polyurethane long 66mm 74.2 Polyester fiber short 36mm 75.6 Polyester fiber long 66mm 73.8 melamine short 36mm 76.9 melamine long 66mm 74.1 No air nozzle / / 76.7

[0065] Please see Figures 8 to 9 , Figure 8 This is an exploded view of the noise reduction component 2 shown in some embodiments of this application; Figure 9 This is a side view schematic diagram illustrating a noise-reducing hair dryer 1 according to some embodiments of this application. Please refer to... Figures 1 to 9 As shown, the noise reduction component 2 may include a flow guide housing 23, a cover plate 25, a first housing 21, a second housing 22, and a magnetic suction element 3. Specifically, the second housing 22 is sleeved on the outer periphery of the first housing 21 and can be integrally formed with the first housing 21; multiple axially extending partition ribs 230 are circumferentially arranged on the outer peripheral sidewall of the flow guide housing 23, and the partition ribs 230 can be integrally formed with the flow guide housing 23. The first housing 21 and the second housing 22 can enclose an annular noise reduction cavity 24, and the cover plate 25 is disposed at at least one end of the noise reduction cavity 24 to close the noise reduction cavity 24.

[0066] In some embodiments, the interior of the first housing 21 has a receiving cavity 210 for mounting the flow guide housing 23 and the partition ribs 230, and the noise reduction air duct 20 formed by the flow guide housing 23 and the first housing 21 is an annular air duct. Each of the plurality of partition ribs 230 extends along the extension direction of the noise reduction air duct 20 (which can be understood as the axial direction of the flow guide housing 23) and is located within the noise reduction air duct 20. One side of the partition rib 230 is connected to the outer wall of the flow guide housing 23; the other side of the partition rib 230 typically abuts against the first housing 21, and abuts between two adjacent rows of noise reduction holes 240 on the first housing 21, to reduce or even avoid obstruction of the noise reduction holes 240, thereby reducing or even avoiding interference with the sound waves passing through the noise reduction holes 240.

[0067] Furthermore, multiple partition ribs 230 can be evenly arranged around the axis of the noise reduction duct 20 (guide housing 23). Assuming that N partition ribs 230 are evenly arranged circumferentially on the outer wall of the guide housing 23, the included angle θ between adjacent partition ribs 230 is 360 / N. The guide housing 23 and the partition ribs 230 are inserted axially into the first housing 21. The partition ribs 230 abut against the inner wall of the first housing 21 but do not obstruct the noise reduction holes 240. Multiple partition ribs 230 can thus divide the noise reduction duct 20 into multiple sub-ducts.

[0068] In the above technical solution, the partition ribs 230 play a role in diverting the gas discharged from the air outlet 100. The diversion can reduce the mutual interference between airflows of different regions and velocities within the noise reduction duct 20, thereby reducing turbulence, making the gas flow smoother, and effectively reducing noise. The design of the annular duct can increase the attenuation distance of noise waves to further reduce noise. The circumferentially evenly distributed partition ribs 230 make the airflow diffusion and sound wave transmission within each sub-duct more uniform, thereby improving the overall noise reduction effect.

[0069] Furthermore, each of the partition ribs 230, near the end of the air outlet 202 and the cover plate 25, can extend radially outward to form a snap-fit ​​protrusion 231; similarly, multiple snap-fit ​​grooves 251 are evenly distributed circumferentially on the inner side of the cover plate 25; the snap-fit ​​grooves 251 are used to accommodate the snap-fit ​​protrusions 231, and the number of snap-fit ​​grooves 251 and snap-fit ​​protrusions 231 are equal and the included angles are equal in the circumferential arrangement. After the noise reduction component 2 is assembled, the snap-fit ​​protrusions 231 and snap-fit ​​grooves 251 engage and mate to circumferentially limit the flow guide housing 23, reducing the probability that the circumferential movement of the flow guide housing 23 will affect the noise reduction of the noise reduction component. The cover plate 25 can be welded to the first housing 21 and the second housing 22 by ultrasonic welding; the cover plate 25 can also be integrally formed with the flow guide housing 23 to facilitate the installation of the noise reduction component 2.

[0070] In some embodiments, the noise reduction component further includes a magnetic chuck 3. The end of the second housing 22 near the air outlet 100 can be bent toward the first housing 21 and integrally formed with the first housing 21. The magnetic chuck 3 can be disposed at the bent end of the second housing 22, that is, the magnetic chuck 3 can be disposed at the end of the second housing 22 used to connect with the fan body 10. In this embodiment, the magnetic chuck 3 can be a ring magnet. The ring magnet is embedded in the end of the second housing 22 bent toward the first housing 21 and used to dock with the fan body 10. Correspondingly, the end of the fan body 10 with the air outlet 100 can also be provided with a ring magnet, so that the noise reduction component 2 can be detachably connected to the fan body 10 through the magnetic chuck 3.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A noise-reducing hair dryer, comprising a fan body having an air outlet, the fan body being used to output airflow through the air outlet, characterized in that, The noise-reducing hair dryer also includes: A noise reduction component is detachably connected to one end of the fan body having the air outlet; the noise reduction component includes a noise reduction duct that communicates with the air outlet; the width of the air outlet of the noise reduction duct is greater than the width of the air outlet.

2. The noise-reducing hair dryer according to claim 1, characterized in that, The end of the noise reduction duct that connects to the air outlet is the air inlet, and the width of the air inlet of the noise reduction duct is greater than the width of the air outlet.

3. The noise-reducing hair dryer according to claim 2, characterized in that, The width of the noise reduction duct is constant from the air inlet to the air outlet; the ratio of the width of the noise reduction duct to the width of the air outlet is 1.1 to 1.

5.

4. The noise-reducing hair dryer according to claim 1, characterized in that, The width of the noise reduction air duct gradually increases from the air inlet to the air outlet.

5. The noise-reducing hair dryer according to claim 4, characterized in that, The noise reduction component includes a flow guide housing and a first housing sleeved outside the flow guide housing. The noise reduction air duct is formed by the first housing and the flow guide housing. From the air inlet to the air outlet, the flow guide housing is radially recessed and arc-shaped relative to the first housing.

6. The noise-reducing hair dryer according to claim 1, characterized in that, The noise reduction duct includes a connecting section and an outgoing section that are interconnected, and the connecting section is connected to the air outlet. Along the air outlet direction of the noise reduction duct, the width of the connecting flow section gradually increases, while the width of the outlet flow section remains constant.

7. The noise-reducing hair dryer according to any one of claims 1-6, characterized in that, The noise reduction component further includes a noise reduction cavity, the extension direction of which is consistent with the extension direction of the noise reduction air duct, and the noise reduction cavity and the noise reduction air duct are separated by a first housing. The first housing is provided with a plurality of evenly arranged noise reduction holes, and the noise reduction cavity and the noise reduction air duct are connected through the noise reduction holes.

8. The noise-reducing hair dryer according to claim 7, characterized in that, The noise reduction cavity includes a first noise reduction cavity and a second noise reduction cavity that are independent of each other, and the first noise reduction cavity and the second noise reduction cavity are arranged along the extension direction of the noise reduction air duct; The perforation rate of the noise reduction hole connected to the first noise reduction cavity is less than the perforation rate of the noise reduction hole connected to the second noise reduction cavity.

9. The noise-reducing hair dryer according to claim 7, characterized in that, The noise reduction component also includes a sound-absorbing element, which is disposed inside the noise reduction cavity and attached to the side of the noise reduction cavity near the noise reduction hole.

10. The noise-reducing hair dryer according to any one of claims 1-6, characterized in that, The noise reduction duct is an annular duct, and the noise reduction component also includes multiple partition ribs, each of which is arranged in the noise reduction duct along the extension direction of the noise reduction duct. Multiple partition ribs are evenly distributed around the axis of the noise reduction duct to divide the noise reduction duct into multiple sub-ducts.

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