Micro-perforated noise-reducing air outlet structure and its application in hair dryers

Abstract

This invention discloses a micro-perforated noise-reducing air outlet structure and a hair dryer with the micro-perforated noise-reducing air outlet structure. The micro-perforated noise-reducing air outlet structure includes a shell with an air outlet; a fan assembly installed inside the shell and axially distributing air towards the air outlet; and a micro-perforated component, which is a box-shaped structure with an inner cavity. The micro-perforated component is installed inside the shell and connected to the air outlet. The circumferential sidewall of the micro-perforated component and the inner sidewall of the air outlet are spaced apart to form an air outlet channel. Several micro-holes are opened on the sidewall of the micro-perforated component facing the fan assembly. The inner cavity is connected to the inside of the shell through the micro-holes, and a sound-absorbing component is placed in the inner cavity. The inner cavity of the micro-perforated component constitutes a sound-absorbing cavity that is not air-permeable, achieving a sound-absorbing effect without increasing wind resistance or reducing the air velocity and air pressure.

Description

Technical Field

[0001] This invention relates to hair dryers, and more particularly to a micro-perforated noise-reducing air outlet structure and a hair dryer using the same. Background Technology

[0002] Hair dryers use a high-speed rotating fan to generate a high-speed airflow to dry the surface of a person or object. Especially when drying a person, the noise generated by the fan's outlet is transmitted directly towards the body through the air outlet. The perceived noise level is quite high, affecting the user's ability to hear other external sounds while using the hair dryer. Therefore, noise reduction measures are needed on the air outlet side of the hair dryer. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in related technologies. To this end, the present invention proposes a micro-perforated noise-reducing air outlet structure.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] The present invention also proposes a hair dryer having the above-mentioned micro-perforated noise reduction air outlet structure.

[0006] The micro-perforated noise reduction air outlet structure according to a first aspect embodiment of the present invention includes:

[0007] The outer casing has an air outlet.

[0008] A fan assembly, which is installed inside the housing and oriented toward the air outlet to deliver axial airflow;

[0009] The micro-penetrating component is a box-shaped structure with an inner cavity. The micro-penetrating component is installed inside the outer shell and connected to the air outlet. The circumferential sidewall of the micro-penetrating component and the inner sidewall of the air outlet are spaced apart to form an air outlet channel. The sidewall of the micro-penetrating component facing the fan assembly has several micro-holes. The inner cavity is connected to the interior of the outer shell through the micro-holes. A sound-absorbing component is placed in the inner cavity.

[0010] The micro-perforated noise reduction air outlet structure according to the embodiments of the present invention has at least the following beneficial effects: the inner cavity of the micro-perforated component constitutes a sound-absorbing cavity that is not breathable, which achieves the sound-absorbing effect without increasing wind resistance or reducing the wind speed and wind pressure of the outlet air.

[0011] According to some embodiments of the present invention, the sound-absorbing component is stainless steel wire wool and / or rock wool sound-absorbing cotton.

[0012] According to some embodiments of the present invention, the sidewall thickness of the micro-perforation component where the micro-hole is located does not exceed 1 mm, and the aperture size of the micro-hole is smaller than the sidewall thickness size of the micro-perforation component where the micro-hole is located.

[0013] According to some embodiments of the present invention, the sidewall of the micro-penetrating component facing the fan assembly is connected to the circumferential sidewall of the micro-penetrating component by an arc-shaped transition surface, and the arc-shaped transition surface extends in an arc along the airflow blown out by the fan assembly.

[0014] According to some embodiments of the present invention, the micro-perforation component includes a cap and a body having an opening and being bowl-shaped, the cap sealingly covering the opening side of the body, the inner cavity being formed between the cap and the inner wall of the body, and the micropores being formed on the side wall of the body facing the fan assembly.

[0015] According to some embodiments of the present invention, the main body has a plurality of air holes uniformly formed on its circumferential sidewalls, which are not connected to the inner cavity, and the air holes connect the circumferential sidewalls of the main body to the opening of the main body.

[0016] According to some embodiments of the present invention, the vent is a circular hole that penetrates radially along the main body, or the vent is inclined from the inner side to the outer front side of the circumferential sidewall of the main body.

[0017] According to some embodiments of the present invention, the housing is further provided with a hollow cylindrical support with open ends. One end of the support is constricted and fixed at the air outlet. The micro-penetrating component is snapped and fixed at the constricted end of the support. The air outlet channel is formed between the circumferential sidewall of the micro-penetrating component and the constricted end.

[0018] According to some embodiments of the present invention, a plurality of through holes are provided on the circumferential sidewall of the bracket, and sound insulation cotton is wrapped around the periphery of the circumferential sidewall of the bracket.

[0019] According to a second aspect embodiment of the present invention, a hair dryer employs a micro-perforated noise-reducing air outlet structure.

[0020] The hair dryer according to embodiments of the present invention has at least the following beneficial effects: when the hair dryer blows air towards the human body, it can effectively reduce the decibel level of noise directly transmitted to the person being blown on.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is an exploded view of the structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the internal structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the micro-perforated component;

[0026] Figure 4 This is a schematic diagram of another embodiment of the micro-penetrating component;

[0027] Figure 5 This is a schematic diagram of the support structure.

[0028] Figure label:

[0029] Casing 100; Air outlet 110; Air outlet 111;

[0030] Fan assembly 200;

[0031] Micro-perforation component 300; inner cavity 301; micropore 302; sound-absorbing component 310; cap 320; main body 330; arc-shaped transition surface 331; vent 332;

[0032] Bracket 400; tapered end 410; locking position 411; through hole 420; sound insulation cotton 430. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] This invention relates to a micro-perforated noise-reducing air outlet structure, and also to a hair dryer using the micro-perforated noise-reducing air outlet structure. The micro-perforated noise-reducing air outlet structure includes a housing 100, a fan assembly 200, and micro-perforated components 300.

[0035] like Figure 1 and Figure 2As shown, the outer casing 100 is a hollow, cylindrical shape with openings at both ends, serving as part of the air outlet side of the hair dryer. One end of the outer casing 100 is the air outlet 110, and the fan assembly 200 is installed at the other end of the outer casing 100. The fan assembly 200 and the air outlet 110 are coaxial. The fan assembly 200 delivers axial airflow towards the air outlet 110 of the outer casing 100. The micro-penetrating component 300 is installed inside the outer casing 100 and located at the air outlet 110. The micro-penetrating component 300 has a box-shaped structure with an inner cavity 301. In this embodiment, the air outlet 110 is circular, and the circumferential sidewall of the micro-penetrating component 300 matches the shape of the air outlet 110 in a circular shape. This circumferential sidewall is the sidewall surrounding the axial direction of the micro-penetrating component 300. The circumferential sidewall of the micro-penetrating component 300 is spaced from the air outlet 110, forming an air outlet channel 111. In this embodiment, the air outlet channel 111 is annular. Preferably, the micro-perforation component 300 and the fan assembly 200 are coaxially arranged. The micro-perforation component 300 has several micro-holes 302 on its sidewall facing the fan assembly 200. The micro-holes 302 communicate between the inner cavity 301 and the interior of the outer shell 100, while the rest of the inner cavity 301 is sealed; that is, the inner cavity 301 is only connected to the outside through the micro-holes 302. A sound-absorbing component 310 is placed in the inner cavity 301, and the sound-absorbing component 310 has the function of absorbing and isolating noise.

[0036] During operation, the fan assembly 200 starts, and airflow is directed towards the outlet 110 within the housing 100. Some airflow impacts the sidewall of the micro-perforation component 300 where the micro-holes 302 are located. Since the inner cavity 301 of the micro-perforation component 300 is sealed except for the area where the micro-holes 302 are located, very little airflow enters the inner cavity 301 through the micro-holes 302; the vast majority of the airflow flows along the outer wall of the micro-perforation component 300 towards the outlet 110. When the airflow in the housing 100 flows through the outlet channel 111, the outlet channel 111 forms a constriction relative to the interior of the housing 100, and the airflow is discharged at high speed from the outlet channel 111 into the external environment. When the fan assembly 200 starts, noise is generated at the outlet end of the fan assembly 200 (the end facing the outlet 110), and the noise is transmitted linearly along the axial direction of the fan assembly 200 towards the outlet 110. When noise is transmitted to the side wall of the micro-penetrating component 300 facing the fan assembly 200, the noise passes through the micro-holes 302 and enters the inner cavity 301. The noise is then absorbed and shielded by the silencing component 310. Some noise encounters the inner wall in the inner cavity 301 and is refracted onto the silencing component 310 for re-absorption, greatly reducing the decibel level of noise transmitted axially from the side of the air outlet 110 to the outside. When the hair dryer blows air towards a person, it effectively reduces the decibel level of noise directly transmitted to the person being blew into. The inner cavity 301 of the micro-penetrating component 300 constitutes a sound-absorbing, airtight silencing cavity, achieving a silencing effect without increasing wind resistance or reducing wind speed and pressure. The air outlet channel 111 formed by the micro-penetrating component 300 and the air outlet 110 increases the airflow velocity.

[0037] In some specific embodiments of the present invention, the silencing component 310 mainly functions as a sound absorber, that is, the silencing component 310 can be made of various materials with sound-absorbing effects. In this embodiment, preferably, the silencing component 310 is made of one or more of stainless steel wire wool and rock wool sound-absorbing cotton. Stainless steel wire wool and rock wool sound-absorbing cotton not only have good sound absorption effects and are lightweight when filled in the inner cavity 301, but also have high temperature resistance properties, which can meet the high temperature environment when the hair dryer is used in hot air mode.

[0038] In some specific embodiments of the present invention, the sidewall thickness of the micro-perforation component 300 where the micro-hole 302 is located does not exceed 1 mm, and the aperture size of the micro-hole 302 is smaller than the sidewall thickness of the micro-perforation component 300. Within this size range, the micro-perforation component 300 can effectively absorb sound without generating wind resistance. The micro-hole 302 at this size can effectively prevent airflow from entering the inner cavity 301, and the thin wall thickness can absorb the noise transmitted axially from the fan assembly 200 into the inner cavity 301.

[0039] In some specific embodiments of the present invention, such as Figure 3As shown, the sidewall of the micro-penetrating component 300 facing the fan assembly 200 is a plane, and the micro-holes 302 are formed on this plane sidewall. The circumferential sidewall of the micro-penetrating component 300 extends axially from all sides of the plane sidewall. The transition between the plane sidewall and the circumferential sidewall of the micro-penetrating component 300 is an arc-shaped transition surface 331. The arc of the arc-shaped transition surface 331 follows the direction of the airflow blown out by the fan assembly 200, that is, from the plane sidewall to the circumferential sidewall, and the distance between the arc-shaped transition surface 331 and the central axis of the micro-penetrating component 300 gradually increases. The airflow impacts the plane sidewall, and then the airflow flows along the plane sidewall, the arc-shaped transition surface 331, and the circumferential sidewall towards the air outlet channel 111, which can effectively reduce the wind resistance of the micro-penetrating component 300 to the airflow and reduce wind power loss. Furthermore, the micro-hole 302 component includes a cap 320 and a body 330. The body 330 is bowl-shaped, with one end facing the fan assembly 200. The micro-hole 302 is formed on the side wall of this end, and the other end is open. The cap 320 covers the open side of the body 330, and the cap 320 and the inner wall of the body 330 form a closed inner cavity 301. Wherein, as Figure 3 As shown, the cover 320 can be flush with the open end face of the main body 330. The silencer 310 is placed inside the main body 330, and then the cover 320 is placed on top of the main body 330. The cover 320 and the main body 330 can be fastened together with screws. The connection between the cover 320 and the main body 330 can be sealed using sealing rings or adhesives. The cover 320 can be positioned flush with the edge of the air outlet 110, and the main body 330 is located inside the outer casing 100. The surface of the cover 320 facing the inner cavity 301 can be corrugated to facilitate noise refraction within the inner cavity 301 and absorption by the silencer 310. Alternatively, as shown... Figure 4 As shown, the cover 320 extends into the interior of the main body 330 to a certain depth for sealing. Specifically, a portion of the circumferential sidewall of the main body 330 extends beyond the location of the cover 320 towards the opening end. Several air holes 332 are formed on this section of the circumferential sidewall. The air holes 332 connect the inner and outer sides of this section of the circumferential sidewall, but they do not connect with the inner cavity 301. When airflow flows along the circumferential sidewall of the main body 330, it flows through the air holes 332. Some airflow passes through the air holes 332 and flows towards the inner side of the circumferential sidewall of the main body 330, increasing the airflow volume at the middle position when the air exits from the air outlet channel 111. The air holes 332 can be circular, penetrating the circumferential sidewall of the main body 330 radially. Alternatively, the air holes 332 can be inclined, tilting forward from the inner side to the outer side of the circumferential sidewall of the main body 330.

[0040] In some specific embodiments of the present invention, such as Figure 2 and Figure 5As shown, a support 400 is provided inside the outer casing 100. The support 400 is a hollow column with openings at both ends. The support 400 is coaxially arranged with the micro-penetrating component 300 and the fan assembly 200 inside the outer casing 100, and the support 400 surrounds the micro-penetrating component 300. One end of the support 400 faces the fan assembly 200, and the other end is located at the air outlet 110. The end of the support 400 at the air outlet 110 is constricted, and this end of the support 400 is defined as the constricted end 410. The constricted end 410 is tightly fixed to the inner wall of the air outlet 110. The circumferential sidewall of the micro-penetrating component 300 and the inner wall of the constricted end 410 are spaced apart to form the aforementioned air outlet channel 111. Multiple locking positions 411 can be provided circumferentially on the inner sidewall of the constricted end 410, and the micro-penetrating component 300 is fixed to the locking positions 411 by locking blocks. The bracket 400 has several through holes 420 on its circumferential sidewalls, each through hole 420 extending axially in an elongated shape. The through holes 420 are distributed axially. Sound-absorbing cotton 430 is wrapped around the circumferential sidewalls of the bracket 400, covering the through holes 420. When the fan starts, some of the noise generated inside the outer casing 100 is absorbed by the sound-absorbing cotton 430 through the through holes 420. The through holes 420 are designed to reduce airflow resistance on the inner sidewalls of the bracket 400 while ensuring that noise can pass directly through them for sound absorption.

[0041] In the description of this specification, references to terms such as "some specific embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A micro-perforated noise-reducing air outlet structure, characterized in that, include: The outer casing (100) is provided with an air outlet (110). A fan assembly (200) is installed inside the housing (100) and axially flows air toward the air outlet (110); A micro-penetrating component (300) is a box-shaped structure with an inner cavity (301). The micro-penetrating component (300) is installed inside the outer shell (100) and connected to the air outlet (110). The circumferential sidewall of the micro-penetrating component (300) and the inner sidewall of the air outlet (110) are spaced apart to form an air outlet channel (111). A plurality of micro-holes (302) are opened on the sidewall of the micro-penetrating component (300) facing the fan assembly (200). The inner cavity (301) is connected to the interior of the outer shell (100) through the micro-holes (302). A sound-absorbing component (310) is placed in the inner cavity (301). The sidewall thickness of the micro-perforation component (300) where the micro-hole (302) is located does not exceed 1 mm, and the aperture size of the micro-hole (302) is smaller than the sidewall thickness size of the micro-perforation component (300) where the micro-hole (302) is located.

2. The micro-perforated noise reduction air outlet structure according to claim 1, characterized in that: The sound-absorbing component (310) is stainless steel wire wool and / or rock wool sound-absorbing cotton.

3. The micro-perforated noise reduction air outlet structure according to claim 1, characterized in that: The sidewall of the micro-penetrating component (300) facing the fan assembly (200) is connected to the circumferential sidewall of the micro-penetrating component (300) by an arc-shaped transition surface (331), which extends in an arc shape along the airflow blown out by the fan assembly (200).

4. The micro-perforated noise reduction air outlet structure according to claim 1 or 3, characterized in that: The micro-perforation component (300) includes a cap (320) and a body (330) with an opening and in the shape of a bowl. The cap (320) seals the opening side of the body (330). The inner cavity (301) is formed between the cap (320) and the inner wall of the body (330). The micro-hole (302) is formed on the side wall of the body (330) facing the fan assembly (200).

5. The micro-perforated noise reduction air outlet structure according to claim 4, characterized in that: The main body (330) has a plurality of air holes (332) that are not connected to the inner cavity (301) evenly distributed on its circumferential sidewall. The air holes (332) connect the circumferential sidewall of the main body (330) to the opening of the main body (330).

6. The micro-perforated noise reduction air outlet structure according to claim 5, characterized in that: The vent (332) is a circular hole that penetrates radially along the main body (330), or the vent (332) is inclined from the inside to the outside front side of the circumferential sidewall of the main body (330).

7. The micro-perforated noise reduction air outlet structure according to claim 1, characterized in that: The outer casing (100) is also provided with a hollow columnar support (400) with openings at both ends. One end of the support (400) is constricted and fixed at the air outlet (110). The micro-penetrating component (300) is snapped and fixed at the constricted end (410) of the support (400). The circumferential sidewall of the micro-penetrating component (300) and the constricted end (410) are spaced apart to form the air outlet channel (111).

8. The micro-perforated noise reduction air outlet structure according to claim 7, characterized in that: The bracket (400) has several through holes (420) on its circumferential sidewall, and sound insulation cotton (430) is wrapped around the circumferential sidewall of the bracket (400).

9. A hair dryer, characterized in that: The micro-perforated noise reduction air outlet structure according to any one of claims 1 to 8 is applied.

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