Electric hair drier with noise reduction air duct

Abstract

The electric hair drier comprises a body, the body comprises a tubular shell, a handheld part is formed on the outer surface of the shell, the air duct is formed on the inner surface of the shell, and an air inlet of the air duct is located at the end of the shell; wherein the air duct is sequentially provided with a sound absorption area and a rectification area in the fluid flowing direction, and the sound absorption area and the rectification area are used for absorbing noise and adjusting the form of fluid correspondingly; a motor is also arranged at the downstream of the rectification area; the area from the top end of the fan blade of the motor to the edge of the rectification area is a slow flow area, and the ratio of the section length a of the slow flow area to the section length b of the sound absorption area is (0.8-1.2): 1. According to the technical scheme, when airflow enters the air channel, the form of fluid is adjusted through the rectification area, the flow speed and flow distribution of the fluid are changed, the friction force generated by the airflow and the fan blades is reduced through the flow slowing area, and finally the noise decibel is further reduced in combination with the sound absorption area.

Description

Technical Field

[0001] The utility model belongs to the technical field of hair dryers, and in particular relates to a hair dryer with a noise-reducing air duct. Background Art

[0002] The hair dryer uses a high-speed rotating fan to generate high-speed airflow to dry the human body or the surface of an object. Especially for some high-speed hair dryers with ventilation at the handle, when blowing air to the human body, the noise generated by the blades in the handle of the hair dryer cutting the airflow will be transmitted directly to the human body through the air inlet end of the handle. The decibel of noise felt by the human body is very high, which affects the user's hearing of other external sounds when using the hair dryer. For this reason, it is necessary to reduce the noise on the air inlet side of the hair dryer. Utility Model Content

[0003] The main purpose of the utility model is to provide an electric hair dryer with a noise reduction air duct, aiming to solve the technical problem that when blowing air to a human body, the air inlet end of the hair dryer generates a lot of noise.

[0004] To achieve the above object, the utility model provides a hair dryer with a noise reduction air duct, comprising a body, characterized in that:

[0005] The body comprises a tubular shell, a hand-held portion is formed on the outer surface of the shell, an air duct is formed on the inner surface of the shell, and an air inlet of the air duct is located at the end of the shell;

[0006] Among them, the air duct is provided with a sound absorption zone and a rectification zone in sequence along the fluid flow direction, which are used to absorb noise and adjust the shape of the fluid respectively; a motor is also provided downstream of the rectification zone; the area from the top of the fan blade of the motor to the edge of the rectification zone is a slow flow zone, and the ratio of the section length a of the slow flow zone to the section length b of the sound absorption zone is (0.8~1.2):1.

[0007] Optionally, the sound absorption area and the rectification area are arranged adjacent to each other.

[0008] Optionally, the noise reduction area is sound-absorbing cotton connected to the inner surface of the shell.

[0009] Optionally, the sound-absorbing cotton is ring-shaped.

[0010] Optionally, the rectification area is provided with a rectification piece connected to the inner surface of the shell, and the rectification piece includes a plurality of guide ribs extending along the axial direction, and the guide ribs are interconnected to form an air inlet grid.

[0011] Optionally, the air inlet grid is honeycomb-shaped.

[0012] Optionally, the air inlet is provided with an inner air inlet net and an outer air inlet net which are connected to each other, and the aperture of the inner air inlet net is smaller than that of the outer air inlet net.

[0013] Optionally, a and b range from 8 to 18 mm.

[0014] In the technical solution of the utility model, an air duct is arranged in the handle of the hair dryer, and the air duct includes a sound absorption zone, a rectification zone and a slow flow zone which are arranged in sequence along the flow direction of the fluid, and the ratio of the section lengths of the slow flow zone and the sound absorption zone is reasonably set; when the airflow enters the air duct, the shape of the fluid is adjusted by the rectification zone, the flow velocity and flow distribution of the fluid are changed, and the friction between the airflow and the fan blades is reduced by the slow flow zone, and finally the noise decibels are further reduced in combination with the sound absorption zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A three-dimensional structural diagram of an embodiment of a hair dryer with a noise reduction air duct provided by the utility model;

[0017] Figure 2 for Figure 1 A side view from one angle;

[0018] Figure 3 for Figure 2 Sectional view of section AA;

[0019] Figure 4 for Figure 1 A three-dimensional diagram of the central structure.

[0020] Explanation of reference numerals: hair dryer with noise reduction air duct - 100, main body - 1, shell - 11, hand-held part - 11a, air duct - 11b, air inlet - 11c, connector - 112, motor - 12, sound absorption zone - I, sound absorbing cotton - 13, rectification zone - II, rectification part - 14, guide rib - 141, slow flow zone - III, inner air inlet net - 15, outer air inlet net - 16.

[0021] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the utility model creation of the present application, any of the currently described embodiments or preferred methods.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate that the device referred to must have a specific direction or operate in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] The hair dryer uses a high-speed rotating fan to generate high-speed airflow to dry the human body or the surface of objects. Especially for some high-speed hair dryers with ventilation at the handle, when blowing air to the human body, the noise generated by the blades in the handle of the hair dryer cutting the airflow will be transmitted directly to the human body through the air inlet end of the handle. The decibel of noise felt by the human body is very high, which affects the user's hearing of other external sounds when using the hair dryer.

[0027] In view of this, the utility model provides a hair dryer with a noise reduction air duct. Figure 1-4 For an embodiment of a hair dryer with a noise reduction air duct provided by the utility model, please refer to Figure 1-4 The hair dryer 100 includes a body 1 , which includes a tubular shell 11 , a handle 11 a is formed on the outer surface of the shell 11 , an air duct 11 b is formed on the inner surface of the shell 11 , and an air inlet of the air duct 11 b is located at the end of the shell 11 .

[0028] Among them, the air duct 11b is divided into sound absorption zone I and rectification zone II in sequence along the flow direction of the fluid; a motor 12 is also provided downstream of the rectification zone II; the area from the top of the fan blade of the motor 12 to the edge of the rectification zone II is the slow flow zone III. The functions of each area are different. The sound absorption zone I absorbs the noise generated by the sound-absorbing material; the rectification zone II adjusts the shape of the fluid by changing the structure of the air duct 11b; the airflow velocity decreases and the shape becomes orderly after passing through the rectification zone II. By setting the slow flow zone III for transition, it can effectively prevent the turbulence phenomenon caused by the sudden increase in the flow velocity when the airflow passes through the fan blade, and reduce the friction of the airflow. The sound absorption zone I can well absorb the noise generated when the airflow passes through the slow flow zone III and the rectification zone II. As a preferred embodiment, the ratio of the section length a of the slow flow zone III to the section length b of the sound absorption zone I is (0.8~1.2):1, so as to better reduce the noise decibel. It should be understood that the main body 1 further includes another shell 11 for forming a high-speed air duct 11 b , and a heater disposed in the air duct 11 b .

[0029] In the technical solution of the utility model, an air duct 11b is arranged in the handle of the hair dryer 100, and the air duct 11b includes a sound absorption zone I, a rectifying zone II and a slow flow zone III arranged in sequence along the flow direction of the fluid, and the ratio of the section lengths of the slow flow zone III and the sound absorption zone I is reasonably set; when the airflow enters the air duct 11b, the shape of the fluid is adjusted by the rectifying zone II, the flow velocity and flow distribution of the fluid are changed, and the friction between the airflow and the fan blades is reduced by the slow flow zone III, and finally, the noise decibels are further reduced in combination with the sound absorption zone I.

[0030] To better absorb the noise generated by the rectifier area II and slow flow area III, please refer to Figure 3 In one embodiment of the present utility model, the sound absorption zone I and the rectification zone II are arranged adjacent to each other.

[0031] For further information, see Figure 3 and Figure 4 In one embodiment of the present invention, the noise reduction area is a sound-absorbing cotton 13 connected to the inner surface of the shell 11, and its porous nature is used to reduce noise fluctuations.

[0032] Of course, the structure of the sound-absorbing cotton 13 has many kinds, please refer to Figure 3 and Figure 4 In this embodiment, the sound-absorbing cotton 13 is annular and extends in the axial direction in the same direction as the fluid flow direction. In other embodiments of the present invention, the sound-absorbing cotton 13 can also be designed to be corrugated to increase its contact area with the sound waves.

[0033] To adjust the shape of the fluid and reduce the generation of turbulence, please refer to Figure 3 and Figure 4In one embodiment of the utility model, the rectifying area II is provided with a rectifying member 14 connected to the inner surface of the shell 11, and the rectifying member 14 includes a plurality of guide ribs 141 extending in the axial direction, and the guide ribs 141 are connected to each other to form an air inlet grid. After the airflow enters the air inlet grid, it becomes an orderly regular motion, that is, a laminar flow, which can effectively reduce the friction between the airflow and the shell 11. It should be noted that a clamping member 112 is provided on the shell 11, and the rectifying member 14 has an outer annular wall, and the outer annular wall and the clamping member 112 are clamped to each other to fix the rectifying member 14.

[0034] As a preferred embodiment, the air inlet grid is in a honeycomb shape, which has little effect on the gas flow rate. Of course, in other embodiments, the air inlet grid can also be designed in the shape of square holes, round holes, etc.

[0035] To reduce the amount of foreign matter that enters the air duct 11b, please refer to Figure 3 In one embodiment of the utility model, the air inlet 11c is provided with an inner air inlet net 15 and an outer air inlet net 16 connected to each other, and the aperture of the inner air inlet net 15 is smaller than that of the outer air inlet net 16. This design can effectively block foreign matter from entering, and the outer air inlet net 16 can be removed to remove the blocked foreign matter.

[0036] As a preferred embodiment, the inner air inlet net 15 and the outer air inlet net 16 are connected by magnetic adsorption.

[0037] According to the common size of the hair dryer 100, in this embodiment, the range of a and b is 8-18 mm, which does not affect the size of the overall structure.

[0038] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A hair dryer with a noise reduction air duct, comprising a body, characterized in that: The body comprises a tubular shell, a hand-held portion is formed on the outer surface of the shell, an air duct is formed on the inner surface of the shell, and an air inlet of the air duct is located at the end of the shell; Among them, the air duct is provided with a sound absorption zone and a rectification zone in sequence along the fluid flow direction, which are used to absorb noise and adjust the shape of the fluid respectively; a motor is also provided downstream of the rectification zone; the area from the top of the fan blade of the motor to the edge of the rectification zone is a slow flow zone, and the ratio of the section length a of the slow flow zone to the section length b of the sound absorption zone is (0.8~1.2):

1.

2. The hair dryer with noise reduction air duct according to claim 1, characterized in that: The sound absorption area and the rectification area are arranged adjacent to each other.

3. The hair dryer with noise reduction air duct according to claim 1, characterized in that: The sound absorbing area is sound absorbing cotton connected to the inner surface of the shell.

4. The hair dryer with noise reduction air duct according to claim 3, characterized in that: The sound-absorbing cotton is in a ring shape.

5. The hair dryer with noise reduction air duct according to claim 1, characterized in that: The rectification area is provided with a rectification piece connected to the inner surface of the shell, and the rectification piece includes a plurality of guide ribs extending along the axial direction, and the guide ribs are connected to each other to form an air inlet grid.

6. The hair dryer with noise reduction air duct according to claim 5, characterized in that: The air inlet grid is in a honeycomb shape.

7. The hair dryer with a noise reduction air duct according to claim 1, characterized in that: The air inlet is provided with an inner air inlet net and an outer air inlet net connected to each other, and the aperture of the inner air inlet net is smaller than that of the outer air inlet net.

8. The hair dryer with noise reduction air duct according to claim 1, characterized in that: The range of a and b is 8~18mm.

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