TW201822671A - Blower and noise-absorbing device thereof - Google Patents

Abstract

A blower and a noise-absorbing device of the blower are disclosed for reducing the cost or increasing air volume of conventional low noise blower. The noise-absorbing device of the blower comprises a sleeve and a noise-absorbing sheet. The sleeve includes am annular wall with an outer circumferential surface and an inner circumferential surface. The annular wall has at least one groove extending through the outer circumferential surface and the inner circumferential surface. The noise-absorbing sheet is coupled to the sleeve and located inside of the annular wall. The noise-absorbing sheet has a plurality of meshes.

Description

   Hair dryer and sound absorbing device   

The present invention relates to a hair dryer and its sound absorbing device; in particular, it relates to a sound absorbing device provided at the air inlet of the hair dryer.

With the continuous evolution of motor and fan technology, in order to enhance market competitiveness, commercially available hair dryers have gradually switched to more efficient fans to improve the wind pressure and air volume performance of the hair dryer.

Higher wind pressure and air volume means that the hair dryer is prone to produce more noise, which will have a negative impact on the comfort of the hair dryer. For this reason, some operators have launched products such as low-noise hair dryers. However, related products often have higher costs and lead to high selling prices, and the low-noise hair dryers usually only have a small air volume, which is inconsistent with consumer demand.

In view of this, it is necessary to improve the shortcomings of the above-mentioned prior art to provide a hair dryer with low noise and its sound absorbing device, so as to solve the problems of the excessively high cost and small air volume of the conventional low noise hair dryer, thereby meeting the actual market demand.

The invention provides a sound absorbing device for a hair dryer, which can reduce the noise generated by the hair dryer.

The invention further provides a hair dryer, which is provided with a sound absorbing device to achieve the effect of reducing noise, has a low installation cost and can maintain a high air volume.

The invention discloses a sound absorbing device for a hair dryer, which may include: a sleeve, the sleeve comprising a ring wall, the ring wall having an outer peripheral surface and an inner peripheral surface, the ring wall is provided with at least one through slot, the at least one through The groove penetrates the outer peripheral surface and the inner peripheral surface; and a sound-absorbing sheet body, the sound-absorbing sheet body is combined with the sleeve and is located inside the ring wall, and the sound-absorbing sheet body is provided with a plurality of meshes.

A gap is formed between the sound-absorbing sheet body and the inner peripheral surface, so that an air layer can be formed between the inner peripheral surface and the sound-absorbing sheet body.

The gap is between 0.2 mm and 3 mm, so as to control the thickness of the air layer, so that the sound-absorbing sheet body can effectively absorb the low-frequency, intermediate-frequency, and high-frequency noise generated by the hair dryer.

Wherein, the sound-absorbing sheet body is formed into a ring shape, so that the sound-absorbing sheet body can absorb noise generated when the hair dryer is running.

The sound absorbing sheet system completely covers and shields the at least one through groove on one side of the inner peripheral surface, so as to ensure that airflow does not directly flow into the air inlet of a hair dryer through the at least one through groove.

The ratio of the sum of the area of the at least one through groove on the outer peripheral surface of the annular wall to the surface area of the outer peripheral surface is an open porosity, and the open porosity is between 15% and 80%, so that the air can easily pass through. The at least one through slot and the mesh of the sound-absorbing sheet body flow into the air inlet of the hair dryer.

Wherein, the sound absorbing sheet body is an ultra-micro porous plate body made of a metal material, so that the sound absorbing sheet body has a good noise absorption effect.

Wherein, the sound-absorbing sheet body is an aluminum plate, thereby reducing the weight of the sound-absorbing sheet body and avoiding rust.

Among them, the meshes of the sound-absorbing sheet body are formed by punching, and the punching rate of the sound-absorbing sheet body is less than 0.7%, so that the sound-absorbing sheet body maintains a good structural strength, and thus has a good noise absorption effect.

A filter screen is further included, and the filter screen is disposed between an end edge of the ring wall and the sound-absorbing sheet body in the axial direction of the ring wall. Thereby, the filter can cover an air inlet of a hair dryer to prevent dust or foreign objects from entering the inside of the hair dryer through the air inlet, and has the effect of protecting the hair dryer. Furthermore, since the sleeve is easy to be removed to facilitate the user to clean or replace the filter, it has the effect of improving the convenience of using the hair dryer.

Wherein, the at least one through groove is an elongated hole groove, thereby increasing the opening rate of the sleeve, so that air can easily flow into the air inlet through the at least one through groove and the mesh of the sound absorbing sheet body.

The angle between the extending direction of the at least one through groove and the axial direction of the ring wall is greater than 0 ° and less than 90 °. Thereby, the extending direction of the at least one through slot can be inclined relative to the axial direction of the ring wall corresponding to the rotation direction of the fan of the blower, so as to reduce the situation where the airflow contacts or rubs against the ring wall, thereby avoiding noise.

Wherein, the at least one through groove extends along the axial direction of the ring wall, thereby simplifying the structure of the sleeve and reducing the manufacturing difficulty.

Wherein, the at least one through slot is plural, and each of the through slots is a circular or oval hole slot. Thereby, the at least one through groove can allow air to evenly flow into the air layer between the inner peripheral surface and the sound-absorbing sheet body, so that the air layer can maintain a uniform pressure during the operation of the fan of the hair dryer, so as to ensure the sound-absorbing sheet body Has a good noise absorption effect.

The invention further discloses a hair dryer provided with the sound absorbing device as described above, and may include: a body, the body is provided with an air inlet, and the sleeve is coupled to the body so that the annular wall surrounds the air inlet.

Wherein, one end of the ring wall of the sound absorbing device in the axial direction is provided with a coupling portion, and the coupling portion is coupled to the outer periphery of the air inlet of the body, so that the sleeve can be coupled to the body.

The above-mentioned blower and its sound absorbing device can provide a sound absorbing sheet body to absorb the noise generated by the airflow coming into contact with or friction with the body of the hair dryer, so as to achieve the effect of reducing the noise generated by the hair dryer. In addition, the sound absorbing device can also assist The airflow is guided so that the airflow can smoothly flow into the air inlet and avoid vortex, which can further reduce the noise generated by the hair dryer, so as to achieve the effect of "reducing the noise generated by the hair dryer". In addition, the noise can be reduced only by coupling the sleeve to the body of the hair dryer, and there is no need to change the internal structure of the hair dryer, so there is no need to redesign the hair dryer, which has a lower installation cost; moreover, combining the sleeve does not Will affect the amount of air entering and leaving the hair dryer, so that the hair dryer still maintains a high air volume.

1‧‧‧ sleeve

11‧‧‧ ring wall

11a‧‧‧ edge

111‧‧‧ peripheral surface

112‧‧‧Inner peripheral surface

12‧‧‧through slot

13‧‧‧Combination

2‧‧‧ sound-absorbing sheet body

21‧‧‧ mesh

3‧‧‧ Filter

B‧‧‧ Ontology

B1‧‧‧air inlet

B2‧‧‧fan

X‧‧‧ axial

G‧‧‧ Clearance

F1‧‧‧Axial airflow

F2‧‧‧Radial airflow

FIG. 1 is a schematic partial cross-sectional view of a sound absorbing device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a sound absorbing device combined with a hair dryer according to the first embodiment of the present invention.

FIG. 3 is a schematic partial cross-sectional view of the through groove of the sound absorbing device according to the embodiment of the present invention extending along the axial direction of the ring wall.

FIG. 4 is a schematic partial cross-sectional view of a circular groove of a through groove of a sound absorbing device according to an embodiment of the present invention.

FIG. 5 is a schematic partial cross-sectional view of a sound absorbing device according to a second embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a sound absorbing device combined with a hair dryer according to a second embodiment of the present invention.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention in detail with the accompanying drawings as follows: Please refer to FIG. 1, The sound absorbing device of the hair dryer according to the first embodiment of the present invention includes a sleeve 1 and a sound absorbing sheet body 2, and the sound absorbing sheet body 2 is coupled to the sleeve 1.

The sleeve 1 includes an annular wall 11 having an outer peripheral surface 111 and an inner peripheral surface 112. The outer peripheral surface 111 is located outside the annular wall 11 and the inner peripheral surface 112 is located inside the annular wall 11. The annular wall 11 is provided with at least one through groove 12. The at least one through groove 12 penetrates the outer peripheral surface 111 and the inner peripheral surface 112. The ratio of the total area of the at least one through groove 12 to the outer peripheral surface 111 of the annular wall 11 to the surface area of the outer peripheral surface 111 can be defined as an opening ratio. In this embodiment, the opening ratio is between 15% ~ Between 80%.

The sound-absorbing sheet body 2 is coupled to the sleeve 1 and is located inside the ring wall 11, and the sound-absorbing sheet body 2 is provided with a plurality of mesh holes 21. In this embodiment, the sound absorbing sheet body 2 is an ultra-micro porous plate body made of a metal material, so that the sound absorbing sheet body 2 has a good noise absorption effect. For example, the sound-absorbing sheet body 2 may be an aluminum plate to reduce the weight of the sound-absorbing sheet body 2 and avoid rust. The plurality of meshes 21 can be formed by punching, and the punching rate of the sound-absorbing sheet body 2 is preferably less than 0.7%, so that the sound-absorbing sheet body 2 can maintain a good structural strength, and thus has a good noise absorption effect. . The sound absorbing sheet body 2 is formed into a ring shape. In particular, the ring shape may be a ring shape, an oval ring shape, or a polygonal ring shape, and the sound absorption sheet body 2 may be a single piece of ring shape. Structure; or, the sound absorbing sheet body 2 may be a ring structure composed of a plurality of sheet body units (for example, a plurality of “C” type sheet bodies) connected, and the present invention is not limited thereto.

With the above structure, please refer to FIG. 2. When the sound absorbing device of the hair dryer of the first embodiment is actually used, it can be combined with a hair dryer. In detail, the hair dryer includes a body B, and the body B is provided with an air inlet B1. The sleeve 1 is coupled to the body B, so that the annular wall 11 surrounds the air inlet B1. Wherein, an end edge 11a of the annular wall 11 in the axial direction X is provided with a coupling portion 13 that can be coupled to the outer periphery of the air inlet B1 of the body B, so that the sleeve 1 can be coupled to the body B.

According to this, when a fan B2 of the blower is running, an airflow can be introduced from the air inlet B1, the airflow includes an axial airflow F1 and a radial airflow F2, and the axial airflow F1 can pass along the axial direction X. It passes through the inside of the annular wall 11 to flow into the air inlet B1, so the combination of the sleeve 1 does not affect the amount of air entering and leaving the hair dryer. Since the sound absorbing sheet body 2 is coupled to the inside of the ring wall 11, and the sound absorbing sheet body 2 is provided with a plurality of mesh holes 21, the sound absorbing sheet body 2 can absorb the axial air flow F1 caused by contact or friction with the body B. Noise to reduce the noise generated by the hair dryer.

Furthermore, since the annular wall 11 is provided with at least one through groove 12, and the at least one through groove 12 penetrates the outer peripheral surface 111 and the inner peripheral surface 112, the at least one through groove 12 can be used for air circulation to form the The radial airflow F2 flows into the air inlet B1 through the at least one through groove 12 and the mesh 21 of the sound-absorbing sheet body 2. Thereby, the sound absorbing device of the hair dryer of the first embodiment can also assist in guiding the airflow, so that the airflow flows smoothly into the air inlet B1, thereby preventing air from being generated on the sound absorbing sheet body 2 or the outer periphery of the air inlet B1 of the body B. The eddy current can further reduce the noise generated by the hair dryer.

In order to confirm that the sound absorbing device of the hair dryer of the first embodiment can further reduce the noise generated by the hair dryer by providing the through groove 12 in the ring wall 11, please refer to the following table 1, which is a hair dryer combined with the hair dryer of the first embodiment. Noise absorption device, and another sleeve (combined with the same sound-absorbing sheet body 2) without the through slot 12, and the noise amount actually measured at the same distance (0.3 meters) from the hair dryer.

It can be known from the actual measurement results in Table 1 above that the sound absorption device of the hair dryer of the first embodiment can further reduce the noise generated by the hair dryer because the annular wall 11 is provided with the through groove 12, and the effect is that the hair dryer runs at high speed This is especially noticeable. This is because when the hair dryer is running at a high speed, a large air flow must be introduced from the air inlet B1. At this time, if the hair dryer is combined with another sleeve without the through groove 12, the other sleeve can only be used for the shaft Circulation to the airflow F1, the larger axial airflow F1 is likely to generate eddy currents at the outer periphery of the sound absorbing sheet body 2 or the air inlet B1 of the body B, thereby forming noise; in contrast, in this embodiment, the ring wall 11 At least one through groove 12 is provided for introducing the radial airflow F2, so that the airflow can smoothly flow into the air inlet B1 and avoid vortex, so the noise generated by the hair dryer can be further reduced.

Based on the above technical concept, the following features and detailed descriptions of the sound absorbing device of the hair dryer of each embodiment of the present invention: Please refer to Figures 1 and 2, the sound absorbing sheet body 2 completely covers and shields the at least one through groove 12 in the ring. One side of the inner peripheral surface 112 of the wall 11 ensures that airflow does not directly flow into the air inlet B1 through the at least one through slot 12. A gap G is preferably formed between the sound absorbing sheet body 2 and the inner peripheral surface 112 of the ring wall 11, so that an air layer can be formed between the inner peripheral surface 112 and the sound absorbing sheet body 2. The air layer can be used as a buffer space to improve the noise absorption effect of the sound absorbing sheet body 2. Wherein, the thickness of the air layer will affect the noise absorption effect of the sound absorbing sheet body 2 at different frequencies, and the gap G is preferably between 0.2 mm and 3 mm to control the thickness of the air layer and make the sound absorbing sheet body 2 Can effectively absorb the low frequency, intermediate frequency and high frequency noise generated by the hair dryer.

In this embodiment, the through groove 12 is an elongated hole groove to increase the opening rate of the sleeve 1 so that air can easily flow into the through the at least one through groove 12 and the mesh 21 of the sound-absorbing sheet body 2. Air inlet B1. The angle between the extending direction of the at least one through groove 12 and the axial direction X of the annular wall 11 is preferably greater than 0 ° and less than 90 °. Thereby, the extending direction of the at least one through groove 12 can be inclined relative to the axial direction X of the ring wall 11 corresponding to the rotation direction of the fan B2 of the hair dryer, so as to reduce the situation where the airflow contacts or rubs against the ring wall 11, thereby preventing the noise. However, please refer to FIG. 3. In some embodiments of the present invention, the at least one through groove 12 may extend along the axial direction X of the ring wall 11, thereby simplifying the structure of the sleeve 1 and reducing the manufacturing difficulty. .

Or, please refer to FIG. 4. In some embodiments of the present invention, the at least one through groove 12 is a plurality, and each of the through grooves 12 is a circular or oval hole groove, and the at least one through groove 12 The grooves 12 can be evenly distributed in the ring wall 11. Thereby, the at least one through groove 12 can allow air to evenly flow into the air layer between the inner peripheral surface 112 of the annular wall 11 and the sound absorbing sheet body 2, so that the air layer can be maintained when the fan B2 of the hair dryer is running. Uniform pressure to ensure that the sound absorbing sheet body 2 has a good noise absorption effect.

Please refer to FIG. 5 and FIG. 6, which is a sound absorbing device of a hair dryer according to a second embodiment of the present invention, which is different from the first embodiment described above in that it further includes a filter 3, which is in the ring wall. An axial direction X of 11 is disposed between an end edge 11 a of the ring wall 11 and the sound absorbing sheet body 2. The end edge 11 a is provided with the aforementioned joint portion 13. In other words, the filter 3 is disposed between the joint portion 13 and the sound-absorbing sheet body 2. Thereby, when the sleeve 1 is coupled to the body B, the filter screen 3 can cover the air inlet B1 of the body B to prevent dust or foreign matter from entering the inside of the hair dryer through the air inlet B1, and has a protection for the hair dryer. effect. Moreover, since the sleeve 1 is easy to be removed, so that the user can clean or replace the filter 3, it has the effect of improving the convenience of using the hair dryer.

In summary, the hair dryer and the sound absorbing device of the embodiments of the present invention are provided with at least one through groove 12 penetrating the outer peripheral surface 111 and the inner peripheral surface 112 of the ring wall 11, and the ring wall 11 is combined with the inside of the ring wall 11. The sound absorbing sheet body 2 can absorb the noise generated by the axial airflow F1 contacting or rubbing with the body B, so as to achieve the effect of reducing the noise generated by the hair dryer. In addition, the at least one through groove 12 can be used for air circulation to form the radial airflow F2, and flows into the air inlet B1 of the hair dryer through the at least one through groove 12 and the mesh 21 of the sound absorbing sheet body 2. With this, the sound absorbing device of the hair dryer of each embodiment of the present invention can also guide the airflow, so that the airflow can smoothly flow into the air inlet B1 to avoid the occurrence of eddy currents, which can indeed further reduce the noise generated by the hair dryer.

Compared with conventional low-noise hair dryers, which generally have higher cost and smaller air volume, the sound absorbing device of the hair dryer of each embodiment of the present invention only needs to combine the sleeve 1 with the body 3 of the hair dryer to achieve the effect of reducing noise. There is no need to change the internal structure of the hair dryer, so there is no need to redesign the hair dryer, which has a lower installation cost. Moreover, the combination of the sleeve 1 does not affect the amount of air flowing in and out of the hair dryer, so that the hair dryer still maintains a high air volume. According to this, the hair dryer and the sound absorbing device of the embodiments of the present invention can indeed solve the problems of the excessively high cost and small air volume of the conventional low-noise hair dryer, so as to meet the needs of consumers.

Although the present invention has been disclosed using the above preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention. The technical scope protected by the invention, so the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims (16)

    A sound absorbing device for a hair dryer includes a sleeve including an annular wall having an outer peripheral surface and an inner peripheral surface. The annular wall is provided with at least one through slot, and the at least one through slot is connected to the through wall. The outer peripheral surface and the inner peripheral surface; and a sound absorbing sheet body, which is coupled to the sleeve and located inside the ring wall, and the sound absorbing sheet body is provided with a plurality of meshes.         The sound absorbing device for a hair dryer according to item 1 of the patent application scope, wherein a gap is formed between the sound absorbing sheet body and the inner peripheral surface.         The sound absorbing device for a hair dryer according to item 2 of the scope of patent application, wherein the gap is between 0.2 mm and 3 mm.         The sound absorbing device for a hair dryer according to item 1 of the scope of patent application, wherein the sound absorbing sheet body is formed in a ring shape.         The sound absorbing device for a hair dryer according to item 1 of the scope of patent application, wherein the sound absorbing sheet system completely covers and shields the at least one through groove on one side of the inner peripheral surface.         The sound absorbing device for a hair dryer according to item 1 of the scope of patent application, wherein the ratio of the sum of the area of the at least one through groove on the outer peripheral surface of the annular wall to the surface area of the outer peripheral surface is an opening ratio, and the opening ratio is Between 15% and 80%.         The sound absorbing device for a hair dryer according to item 1 of the scope of the patent application, wherein the sound absorbing sheet body is an ultra-micro porous plate body made of a metal material.         The sound absorbing device for a hair dryer according to item 7 of the scope of patent application, wherein the sound absorbing sheet body is an aluminum plate.         The sound absorbing device for a hair dryer according to item 1 of the scope of patent application, wherein a plurality of meshes of the sound absorbing sheet body are formed by punching, and the punching rate of the sound absorbing sheet body is 0.7% or less.         The sound absorbing device of the hair dryer according to item 1 of the scope of the patent application, further comprising a filter screen, the filter screen is disposed between one end edge of the ring wall and the sound absorbing sheet body in the axial direction of the ring wall.         The sound absorbing device for a hair dryer according to item 1 of the scope of patent application, wherein the at least one through groove is an elongated hole groove.         The sound absorbing device for a hair dryer according to item 11 of the scope of patent application, wherein an included angle between an extension direction of the at least one through groove and an axial direction of the ring wall is greater than 0 ° and less than 90 °.         The sound absorbing device for a hair dryer according to item 11 of the patent application scope, wherein the at least one through groove extends along the axial direction of the ring wall.         The sound absorbing device for a hair dryer according to item 1 of the scope of the patent application, wherein the at least one through slot is a plurality, and each of the through slots is a circular or oval hole slot.         A hair dryer is provided with the sound absorbing device according to any one of claims 1 to 14, and includes: a body, the body is provided with an air inlet, and the sleeve is combined with the body so that the ring wall surrounds the inlet tuyere.         The hair dryer according to item 15 of the scope of the patent application, wherein an end edge of the ring wall of the sound absorbing device in the axial direction is provided with a coupling portion, and the coupling portion is coupled to the outer periphery of the air inlet of the body.