阅读说明：本技术 吹风机 (Hair drier ) 是由 保罗·安德罗 刘正伟 安德列·柴斯托那罗 江雯雯 彭世警 于 2020-05-25 设计创作，主要内容包括：本发明提供了一种吹风机。吹风机的输出功率为500W-1500W,吹风机的风速为40m/s-100m/s,且风量为200cfm-800cfm,吹风机包括：机壳,机壳设有握持部；轴流风扇,轴流风扇位于机壳内；马达,马达驱动轴流风扇,以产生气流；风管组件,风管组件与机壳连接,且风管组件包括至少一节风管段,至少一节风管段远离机壳的一端为出风端,至少一节风管段的出风端设置有锯齿结构,锯齿结构朝向出风的方向延伸,且锯齿结构的齿沿出风的方向渐缩以形成尖端部。本发明解决了现有技术中吹风机噪音较大的问题。(The invention provides a hair drier. The output power of the blower is 500W-1500W, the wind speed of the blower is 40m/s-100m/s, and the wind volume is 200cfm-800cfm, the blower includes: a casing provided with a holding part; the axial fan is positioned in the shell; a motor driving the axial flow fan to generate an air flow; the air pipe assembly is connected with the casing, the air pipe assembly comprises at least one air-saving pipe section, one end, far away from the casing, of the at least one air-saving pipe section is an air outlet end, the air outlet end of the at least one air-saving pipe section is provided with a sawtooth structure, the sawtooth structure extends towards the direction of air outlet, and the teeth of the sawtooth structure gradually shrink along the direction of the air outlet to form a tip part. The invention solves the problem of higher noise of the hair drier in the prior art.)

1. A hair dryer characterized in that the output power of the hair dryer is 500W-1500W, the wind speed of the hair dryer is 40m/s-100m/s, and the wind volume is 200cfm-800cfm, the hair dryer comprising:

a housing (40), the housing (40) being provided with a grip portion (41);

an axial fan (50), said axial fan (50) being located within said enclosure (40);

a motor (60), the motor (60) driving the axial fan (50) to generate an air flow;

air pipe assembly, air pipe assembly with casing (40) are connected, just air pipe assembly includes an at least festival wind pipeline section (10), at least a lesson wind pipeline section (10) are kept away from the one end of casing (40) is the air-out end, an at least lesson wind pipeline section (10) the air-out end is provided with the sawtooth structure, the sawtooth structure extends towards the direction of air-out, just the tooth of sawtooth structure is followed the direction convergent in order to form pointed end of air-out.

2. The hair dryer of claim 1, wherein said saw tooth structure has a plurality of said teeth, which are arranged in sequence along a circumferential direction of said air duct section (10) to have a ring-like structure.

3. The hair dryer of claim 1, wherein said teeth are pointed or said saw tooth structure is sinusoidal.

4. The hair dryer of claim 1, wherein the thickness of the teeth of said saw tooth structure gradually decreases in the direction of the outlet air.

5. The blower of claim 4,

the teeth of the sawtooth structure are provided with inner side faces facing the interior of the wind pipe section (10) and outer side faces facing the exterior of the wind pipe section (10),

the inner side surface and the outer side surface of each tooth are planes, and the included angle between the inner side surface and the outer side surface of each tooth is 0-15 degrees; or

The tooth medial surface is the cambered surface, the cambered surface is along deviating from the direction uplift of tooth lateral surface.

6. The hair dryer of claim 1, wherein said saw tooth structure has a plurality of dimples (112) formed on an inner side of the teeth facing into the duct of said air duct section (10), and/or wherein said air duct section (10) has a plurality of dimples (112) formed on an inner wall of the duct adjacent to said saw tooth structure.

7. The hair dryer of claim 6, wherein a cross-sectional shape of a plurality of said depressions (112) is circular, a diameter of a plurality of said depressions (112) is 2-5mm, and a distance between centers of a plurality of said depressions (112) is 2-10 mm.

8. The hair dryer according to any one of claims 1 to 7, characterized in that said at least one throttle section (10) comprises only a barrel (12), the base width of each tooth of the saw tooth structure of said barrel (12) being λ₃The height of each tooth of the sawtooth structure of the blowpipe (12) is h₃Said

9. The hair dryer according to any one of claims 1 to 7, characterized in that said at least one air duct section (10) comprises only a barrel (12), said barrel (12) having an internal diameter of 50mm-100mm, said barrel (12) having a saw tooth structure with a number of teeth of 8-30.

10. The hair dryer of any one of claims 1 to 7, wherein said air duct assembly comprises a plurality of said air duct sections (10), and at least one set of two adjacent air duct sections (10) have different inside diameters, and the inside diameter of said air duct section (10) near the air outlet side is larger than the inside diameter of said air duct section (10) near the air inlet side.

11. The hair dryer of claim 10, wherein said air duct assembly comprises two of said air duct sections (10), said two air duct sections (10) being:

a blowpipe (12);

the siphon pipe (11), the siphon pipe (11) communicates with the blowpipe (12), the inside diameter of the siphon pipe (11) is greater than the inside diameter of the blowpipe (12), so as to form a siphon air inlet gap between the air inlet end of the siphon pipe (11) and the air outlet end of the blowpipe (12);

the hair dryer has an air volume mode for increasing an air flow through the siphon pipe (11) and blowing the air flow out of the siphon pipe (11), and an air speed mode for blowing the air flow directly out of the blowpipe (12).

12. The blower of claim 11,

when the blower is in the air volume mode, the air speed is 40-70 m/s, the Mach number is 0.1-0.2, and the squeak noise of the blower is reduced by 1.8-3.4 db through the sawtooth structure.

13. The blower of claim 11,

when the blower is in the wind speed mode, the wind speed is 50-90 m/s, the Mach number is 0.15-0.27, and the squeal noise of the blower is reduced by 1.8-3.4 db through the sawtooth structure.

14. The hair dryer of claim 11, characterized in that said outlet end of said blower pipe (12) is provided with said saw tooth structure and/or said outlet end of said siphon pipe (11) is provided with said saw tooth structure.

15. The blower of claim 14,

the bottom width of each tooth of the sawtooth structure of the siphon (11) is lambda₁The height of each tooth of the sawtooth structure of the siphon (11) is h₁SaidOr

The inner diameter of the blowpipe (12) is 50mm-100mm, and the number of teeth of the sawtooth structure of the blowpipe (12) is 8-30.

16. The blower of claim 15,

the base width of each tooth of the sawtooth structure of the blowpipe (12) is lambda₂The height of each tooth of the sawtooth structure of the blowpipe (12) is h₂SaidThe above-mentionedOr

The inner diameter of the siphon (11) is 50-100mm, and the number of teeth of the sawtooth structure of the siphon (11) is 12-36.

17. The hair dryer of claim 14, wherein the saw-tooth structure is provided on both the air outlet end of the air blowing pipe (12) and the air outlet end of the siphon pipe (11), and the ratio of the number of teeth of the saw-tooth structure of the air blowing pipe (12) to the number of teeth of the saw-tooth structure of the siphon pipe (11) is 0.3-1.2.

18. The hair dryer of any one of claims 1 to 7, wherein the air duct section (10) is made of any one of PP, PC, ABS and nylon.

Technical Field

The invention relates to the field of electric tools, in particular to a hair drier.

Background

The blower mainly comprises an air pipe section, a casing, an axial flow fan arranged in the casing and a motor for driving the axial flow fan, wherein the motor drives the fan to rotate, the fan drives air to flow, and the air is blown out from the air outlet end of the air pipe section. The axial fan drives the air to flow to the air outlet end of the air pipe section, and the air flow is larger in vortex amount after being blown out from the air outlet end, so that larger noise is easily generated.

Disclosure of Invention

The invention mainly aims to provide a hair drier to solve the problem of high noise of the hair drier in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a blower having an output power of 500W to 1500W, a wind speed of 40m/s to 100m/s, and an air volume of 200cfm to 800cfm, the blower comprising: a casing provided with a holding part; the axial fan is positioned in the shell; a motor driving the axial flow fan to generate an air flow; the air pipe assembly is connected with the casing, the air pipe assembly comprises at least one air-saving pipe section, one end, far away from the casing, of the at least one air-saving pipe section is an air outlet end, the air outlet end of the at least one air-saving pipe section is provided with a sawtooth structure, the sawtooth structure extends towards the direction of air outlet, and the teeth of the sawtooth structure gradually shrink along the direction of the air outlet to form a tip part.

Further, the sawtooth structure is provided with a plurality of teeth which are sequentially arranged along the circumferential direction of the wind pipe section to form an annular structure.

Further, the teeth are pointed or the saw tooth structure is sinusoidal.

Further, the thickness of the tooth of sawtooth structure reduces along the direction of air-out gradually.

Furthermore, the teeth of the sawtooth structure are provided with inner side faces facing the interior of the pipe of the wind pipe section and outer side faces facing the exterior of the pipe of the wind pipe section, the inner side faces and the outer side faces of the teeth are planes, and the included angle between the inner side faces and the outer side faces of the teeth is 0-15 degrees; or the inner side surface of the tooth is an arc surface which is raised along the direction deviating from the outer side surface of the tooth.

Furthermore, a plurality of concave pits are formed in the inner side surface of the tooth of the sawtooth structure facing the inner side surface of the pipe of the air pipe section, and/or a plurality of concave pits are formed in the inner wall of the pipe of the air pipe section close to the sawtooth structure.

Furthermore, the cross section of the plurality of pits is circular, the diameter of the plurality of pits is 2-5mm, and the distance between the centers of the plurality of pits is 2-10 mm.

Further, at least one of the segments comprises only blowpipes, the base width of each tooth of the sawtooth structure of which is λ₃The height of each tooth of the sawtooth structure of the blowpipe is h₃，

Furthermore, at least one air pipe section only comprises a blowing pipe, the inner diameter of the blowing pipe is 50mm-100mm, and the number of teeth of the sawtooth structure of the blowing pipe is 8-30.

Furthermore, the air pipe assembly comprises a plurality of air pipe sections, the inner diameters of at least one group of adjacent two air pipe sections are different, and the inner diameter of the air pipe section close to the air outlet side is larger than that of the air pipe section close to the air inlet side.

Furthermore, the air pipe assembly comprises two air pipe sections which are blowing pipes; the siphon is communicated with the blowing pipe, and the inner diameter of the siphon is larger than that of the blowing pipe so as to form a siphon air inlet gap between the air inlet end of the siphon and the air outlet end of the blowing pipe; the hair dryer has an air volume mode in which the air flow is increased by the siphon tube and blown out from the siphon tube, and a wind speed mode in which the air flow is blown out directly from the blowpipe.

Furthermore, when the blower is in a wind speed mode, the wind speed is 50m/s-90m/s, the Mach number is 0.15-0.27, and the squeak noise of the blower is reduced by 1.8db-2.1db through the sawtooth structure.

Furthermore, when the blower is in an air volume mode, the air speed is 40-70 m/s, the Mach number is 0.1-0.2, and the squeak noise of the blower is reduced by 1.5-1.8 db through the sawtooth structure.

Furthermore, the air outlet end of the air blowing pipe is provided with a sawtooth structure, and/or the air outlet end of the siphon pipe is provided with a sawtooth structure.

Further, the bottom width of each tooth of the sawtooth structure of the siphon tube is λ₁The height of each tooth of the sawtooth structure of the siphon is h₁，Or the inner diameter of the blowpipe is 50mm-100mm, and the number of teeth of the sawtooth structure of the blowpipe is 8-30.

Further, the base width of each tooth of the sawtooth structure of the blow pipe is λ₂The height of each tooth of the sawtooth structure of the blowpipe is h₂，Or the inner diameter of the siphon pipe is 50-100mm, and the number of teeth of the sawtooth structure of the siphon pipe is 12-36.

Furthermore, the air outlet end of the blowing pipe and the air outlet end of the siphon pipe are both provided with sawtooth structures, and the ratio of the number of teeth of the sawtooth structures of the blowing pipe to the number of teeth of the sawtooth structures of the siphon pipe is 0.3-1.2.

Furthermore, the material of the wind pipe section is any one of PP, PC, ABS and nylon.

By applying the technical scheme of the invention, the motor drives the axial flow fan to rotate, and airflow is generated and flows into the branch pipe sections. The one end that the casing was kept away from to the wind pipeline section is the air-out end, and the air-out end of an at least festival wind pipeline section is provided with the sawtooth structure, and the sawtooth structure extends towards the direction of air-out, and the tooth of sawtooth structure is in order to form the pointed end portion along the direction convergent of air-out. The sawtooth structure can be smashed big whirlpool, and the noise is reduced, reaches and falls the purpose of making an uproar, silence operation for the hair-dryer.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic view of a first embodiment of an air duct assembly of the present invention; and

FIG. 2 shows a schematic diagram of the internal structure of FIG. 1;

FIG. 3 shows an enlarged view of position A of FIG. 2;

FIG. 4 shows an enlarged view of the B position of FIG. 2;

FIG. 5 is a schematic view showing a sawtooth structure provided on a siphon pipe and a sawtooth structure not provided on a blow pipe;

FIG. 6 is a schematic view showing a blowing pipe provided with a serration structure and a siphon pipe not provided with a serration structure;

FIG. 7 shows a schematic view of the adjustment of FIG. 1 to a wind speed mode;

FIG. 8 illustrates a schematic representation of variations in tooth thickness for the first and second saw tooth structures of FIG. 1;

FIG. 9 illustrates a schematic representation of variations in tooth thickness for the first and second saw tooth structures of FIG. 1;

FIG. 10 illustrates a noise reduction curve diagram for the air duct assembly of FIG. 1;

figure 11 shows an internal structural view of a hair dryer;

FIG. 12 shows a schematic view of another embodiment of an air duct assembly of the present invention;

wherein the figures include the following reference numerals:

10. a wind pipe section; 11. a siphon tube; 111. a first saw-tooth structure; 112. a pit; 12. a blowpipe; 121. a second saw-tooth structure; 20. connecting sleeves; 30. a support plate; 40. a housing; 41. a grip portion; 50. an axial flow fan; 60. a motor.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem of higher noise of the hair dryer in the prior art, the invention provides a hair dryer.

Hair dryers currently available on the market are mainly divided into three types, respectively hand-held hair dryers for drying hair, garden hair dryers for garden cleaning, and blowers for industrial use. Specifically, the handheld blower is mainly used for drying hair by a user, the power of the handheld blower is generally 50-200w, the wind speed is 15-50m/s, the wind volume is 10-30cfm, the whole handheld blower has the requirement of small volume, and the inner diameter of an air pipe is usually 28-60 mm; the garden blower is a cleaning tool, a user is required to hold the garden blower by hand to gather leaves, sundries and the like falling on the ground, certain requirements are provided for the hand-held weight and the blowing performance, the power of the garden blower is 500-1500W, the wind speed is 40-100m/s, the wind quantity is 200-800cfm, and the diameter of the wind pipe is 45-120mm so as to match the requirements of the user on the hand-held performance and the performance of the garden blower; for the industrial blower, the blower does not need to be held by hand, only needs to be fixed at a certain position for directly blowing, the blower often pursues high performance, the power of the industrial blower is generally about 1000-5000W, the wind speed is 5-40m/s, the wind volume is generally large, and the inner diameter of the wind pipe is less than 1m, and more than 1m and up to 2 m. The three hair dryers have great performance difference, although the hair dryers are used for blowing, the structures are completely different, the design ideas in the design research and development are completely different, and the garden hair dryer is only innovatively designed.

As shown in fig. 11, the blower includes a cabinet 40, an axial flow fan 50, a motor 60, and an air duct assembly. The housing 40 has a grip 41 with an air inlet and an air outlet. An axial fan 50 is located within the housing 40. The motor 60 drives the axial flow fan 50 to generate an air flow. The air pipe assembly is connected with the air outlet of the casing 40, the air pipe assembly comprises at least one air-saving pipe section 10, one end, far away from the casing 40, of the at least one air-saving pipe section 10 is an air outlet end, and air flow generated by the axial flow fan enters from the air inlet of the casing and blows in from the air outlet to the air pipe assembly and then blows out from the air outlet end of the air pipe assembly.

During use, the blower generates high noise during operation due to the vortex of the air flow. For this reason, there are several main stages: in the first stage, when the axial flow fan 50 rotates, the air is driven to flow to generate air flow, at the moment, the air is accelerated by a speed from a static state, and in the process from static pressure to dynamic pressure, a vortex is generated; in the second stage, when the airflow flows through the axial flow fan 50, the blades of the axial flow fan 50 cut the airflow, and a vortex is also generated in the cutting process; in the third stage, the axial flow fan comprises a hub and blades, the air flow which is blown out initially is annular, the annular air flow is changed into circular air flow, turbulence is generated, and therefore vortex flow is also generated, the vortex flow is continuously generated in the whole air flow path, and the larger the vortex flow is, the louder the noise is.

This application is provided with the sawtooth structure (specifically refer to fig. 1 and 12) at the air-out end of an at least section tuber pipe section 10, and the sawtooth structure extends towards the direction of air-out, and the tooth of sawtooth structure is in order to form pointed end portion along the direction convergent of air-out. The large eddy in the air pipe is broken actually, so that the noise is reduced, the purposes of noise reduction and silent operation of the blower are achieved, and meanwhile, the wind speed and the wind power are basically not influenced.

This sawtooth structure can be closed angle type sawtooth or sinusoidal type sawtooth, and in addition, the sawtooth curve of sinusoidal type sawtooth structure is more level and smooth, can slow down the effect intensity between air current and the sawtooth to a certain extent, has better noise reduction effect. Considering that the tip of the sawtooth structure can be worn in the using process, the top end of the tip part is provided with the flat section, the stress concentration of the tooth end can be reduced due to the fact that the top end of the tip part is provided with the flat section, the service life is prolonged, and meanwhile an operator can be prevented from being scratched in the using process.

In addition, the thickness of the teeth of the sawtooth structure is gradually reduced along the air outlet direction. As shown in fig. 8, the teeth of the sawtooth structure have a tooth inner side surface facing the inside of the duct section 10 and a tooth outer side surface facing the outside of the duct section 10, the tooth inner side surface and the tooth outer side surface are planes, an included angle between the tooth inner side surface and the tooth outer side surface is r, and r is 0-15 degrees. The thickness of tooth reduces along the direction of air-out gradually, and this makes the sawtooth can become thin and sharp-pointed in the direction of air-out, and this has better crushing effect to big whirlpool, and when r was 15 degrees, make the sawtooth have certain intensity and good crushing effect concurrently. In another embodiment, as shown in fig. 9, the inner side of the tooth is a curved surface that bulges away from the outer side of the tooth. The arrangement mode can obviously reduce the stress of the first sawtooth structure 111 and the second sawtooth structure 121, and is not easy to damage in the falling process.

As shown in fig. 1 to 4, the sawtooth structure is provided with a plurality of concave pits 112 facing the inner side surfaces of the teeth in the pipe of the wind pipe section 10, the inner wall of the pipe of the wind pipe section 10 close to the sawtooth structure is provided with a plurality of concave pits 112, the airflow is divided into a boundary layer close to the surface of the wall of the inner pipe and a vortex layer connected with the boundary layer in the flowing process in the siphon 11, and pressure difference exists between the vortex layer and the boundary layer. The pit 112 structure can extend the boundary layer into the pit 112 structure, and the area of the boundary layer is enlarged, so that the pressure difference between the boundary layer and the vortex layer can be reduced, and the noise is reduced.

The cross-sectional shapes of the plurality of pits 112 are circular, the diameters of the plurality of pits 112 are 2-5mm, and the distance between the centers of the plurality of pits 112 is 2-10 mm. Specifically, the diameter of the concave pits 112 is 3mm, and the distance between the centers of the concave pits 112 is 5 mm. The circular pits 112 are convenient to manufacture, and meanwhile, under the condition of the same circumference, the circular pits 112 have the largest area, so that the area of the boundary layer can be enlarged to the greatest extent, the pressure difference between the boundary layer and the turbulent layer can be reduced, and the noise is reduced.

The air pipe assembly comprises a blowpipe 12, and a sawtooth structure is arranged at the air outlet end of the blowpipe 12. To the setting of the terminal sawtooth structure of blowing pipe 12, need consider falling of tuber pipe, the hair-dryer grips through the portion 41 that grips by the user in the use, and the air-out end is to ground the operation of blowing, if the hand loosens, then the very first time and ground contact be exactly the air-out end, therefore the air-out end needs to have certain intensity, can not take place to damage at the in-process that falls. When the serrations are provided at the end of the barrel, the strength of the serrations is of particular concern, so that the serrations cannot be too sharp, and therefore, with the sawThe base width of each tooth of the tooth structure is lambda₃The height of each tooth of the sawtooth structure of the blower pipe 12 is h₃，Or, in another aspect, the inner diameter of the barrel 12 is 50mm to 100mm, and the number of teeth of the zigzag structure of the barrel 12 is 8 to 30, and in this embodiment, the inner diameter of the barrel 12 is 60mm, and the number of teeth of the barrel 12 is 12, so that both noise reduction and strength requirements can be satisfied. The material of tuber pipe subassembly is any one of PP, PC, ABS, nylon to make whole tuber pipe subassembly not fragile at the in-process that falls.

In the process of verifying the sawtooth structure experiment, the same garden blower is adopted, the blower runs at the same motor speed, the lengths of air pipes are the same, and the difference is as follows: the ends of the set of blowpipes 12 do not have a zigzag structure, as shown by the solid line segment in fig. 10; the tail ends of the other group of blowpipes 12 are provided with sawtooth structures, such as broken line segments in fig. 10, and the noise reduction effect between the two is compared. As shown in fig. 10, it can be seen that the solid line segment and the dotted line segment have almost corresponding narrow-band noise distribution and wide-band noise distribution, where the narrow-band noise actually refers to a sound with a large amplitude in a certain frequency, and more generally, a sharp sound, and the sawtooth structure does not affect the noise distribution. The real line segment and the dotted line segment have corresponding sharp sound A and sharp sound B, and we find that the sawtooth structure shows an obvious noise reduction effect on the sharp sound: at the sharp sound A, when the sawtooth structure is not arranged, the noise is 73.94db, when the sawtooth structure is arranged, the noise is changed into 72.67db, and the sharp sound noise is reduced by 1.27 db; and at the point B, when the sawtooth structure is not arranged, the noise is 61.65db, when the sawtooth structure is arranged, the noise is changed into 58.28db, the noise of the point is reduced by 3.37db, and the noise reduction effect of the sawtooth structure on the fixed-frequency point sound is very obvious. In fact, the saw tooth structure of the air outlet pipe of the air pipe section 10 of the garden blower provided by the application obviously reduces the noise, so that the noise quality (sharpness) is improved.

Of course, the air pipe assembly may not only include the blowing pipe 12, but also include the siphon 11, and the air-out end of the blowing pipe 12 is provided with the sawtooth structure, and the air-out end of the siphon 11 is provided with the sawtooth structure, or only the air-out end of the blowing pipe 12 is provided with the sawtooth structure, or only the air-out end of the siphon 11 is provided with the sawtooth structure. That is, the air duct assembly can be not only one section, but also a plurality of sections of air duct sections 10; when there are multiple segments of wind pipe sections 10, all wind pipe sections 10 may have saw-tooth structures (see fig. 1), or some wind pipe sections 10 may have saw-tooth structures (not shown).

When the air duct section 10 has multiple sections, the inner diameters of at least two adjacent air duct sections 10 are different, and the inner diameter of the air duct section 10 close to the air outlet side is larger than the inner diameter of the air duct section 10 close to the air inlet side. Specifically, in the embodiment shown in fig. 1 to 7, the air duct section 10 has two sections, namely, a blowing pipe 12 and a siphon pipe 11, an air inlet end of the siphon pipe 11 is communicated with an air outlet end of the blowing pipe 12, and an inner diameter of the siphon pipe 11 is larger than an inner diameter of the blowing pipe 12, so as to form a siphon air inlet gap between the air inlet end of the siphon pipe 11 and the air outlet end of the blowing pipe 12.

The hair dryer in the present embodiment has an air volume mode in which the air flow is increased by the siphon tube 11 and blown out from the siphon tube 11, and a wind speed mode in which the air flow is blown out directly from the blowpipe 12.

When the blower is in the air volume mode, the siphon 11 needs to be additionally arranged at the air outlet end of the blowpipe 12; or the siphon tube 11 itself is connected to the blowpipe 12, and in this case, the positional relationship between the two must be changed so that the air blown from the blowpipe 12 enters the siphon tube 11. That is to say, when the air current flows through the air pipe section 10 on the air outlet side, the flowing speed of the air current is fast, negative pressure is generated, outside air is supplemented under the action of atmospheric pressure, and enters from the air outlet end of the previous air pipe section 10, so that the effect of increasing the air volume is achieved. When the hair dryer is in the wind speed mode, only the barrel 12 is in use, and the siphon 11 is not used or operative.

Specifically, in the embodiment shown in fig. 2 or 7, the siphon tube 11 is slidably coupled with the blowpipe 12 by a coupling structure so that the siphon tube 11 is slidably adjustable in the axial direction of the blowpipe 12. Specifically, the connecting structure includes a connecting sleeve 20 and a supporting plate 30 fixed along the circumferential direction of the connecting sleeve 20, and the supporting plate 30 is fixed to the siphon tube 11. Thus, when the connecting sleeve 20 is sleeved on the outer surface of the air outlet end of the blowpipe 12 and can slide along the blowpipe 12, the connecting sleeve 20 can drive the siphon tube 11 to move so as to change the position relation of the siphon tube 11 relative to the blowpipe 12. Alternatively, the support plate 30, the connection sleeve 20 and the siphon tube 11 are integrally formed. As can be seen from fig. 2, the inner diameter of the connecting sleeve 20 is slightly larger than the outer diameter of the blowing pipe 12, the outer diameter of the connecting sleeve 20 is smaller than the inner diameter of the siphon pipe 11, and a siphon air intake gap is formed between the connecting sleeve 20 and the siphon pipe 11 by the supporting plate 30. Therefore, the state shown in fig. 2 is the air volume mode.

And the state shown in fig. 7 is the wind speed mode. In the wind speed mode it can be seen that the siphon tube 11 slides back and recedes to a position overlapping the barrel 12, so that only the barrel 12 is put into use and the siphon tube 11 is not active when the hair dryer is in operation.

Of course, in an embodiment not shown in the drawings, the siphon tube 11 may also be detachably mounted at the air outlet end of the blowing pipe 12, for example, by clamping, in the air volume mode, the siphon tube 11 is clamped at the air outlet end of the blowing pipe 12, and in the air speed mode, the siphon tube 11 is detached, and only one section of the blowing pipe 12 is retained.

As shown in fig. 11, in the present embodiment, an axial fan 50 is disposed in the casing 40 for moving the air, when the air flow passes through the siphon 11 from the blowing pipe 12, the high-speed air flow is blown out from the blowing pipe 12, a negative pressure is formed near the blowing pipe 12, the external air flow is supplemented by the external atmospheric pressure, and the flow rate of the air becomes large.

As shown in fig. 1 to 4, in the present embodiment, the air outlet end of the siphon 11 and the air outlet end of the air blowing pipe 12 are both provided with corresponding saw-tooth structures. Thus, the number of the saw-tooth structures is two, and the saw-tooth structures are divided into a first saw-tooth structure 111 arranged at the air outlet end of the siphon pipe 11 and a second saw-tooth structure 121 arranged at the air outlet end of the blowing pipe 12. As shown in fig. 5, the sawtooth structure may be only provided at the air outlet end of the siphon 11, and the blowing pipe 12 is not provided with the sawtooth structure. As shown in fig. 6, the zigzag structure may be provided only at the air outlet end of the blowing pipe 12 and not at the siphon pipe 11. It will be appreciated that for embodiments in which the air duct assembly has only blowpipes, and embodiments in which the air duct assembly has not only blowpipes but also siphon pipes, it is clear that embodiments having only blowpipes are less noisy overall, since the siphon pipe arrangement introduces a new source of noise. And the noise reduction effect of the embodiment that the sawtooth structures are arranged on the blowing pipe and the siphon pipe is obviously better than that of the embodiment that only the blowing pipe is provided with the sawtooth structures or only the siphon pipe is provided with the sawtooth structures.

For the embodiment that the blowing pipe 12 and the siphon pipe 11 are both provided with the sawtooth structures, in the process that the air flow flows through the siphon pipe 11 from the blowing pipe 12, the external air can be supplemented into the siphon pipe 11 from the siphon air inlet gap, and the second sawtooth structure 121 at the air outlet end of the blowing pipe 12 breaks large vortexes in the air flow blown out from the blowing pipe, so that the vortexes are reduced, and the noise is reduced. When the air current flows out from the air-out end of siphon 11, set up first sawtooth structure 111 at the air-out end of siphon 11, can further smash big whirlpool, reduce the vorticity, further noise reduction.

As shown in fig. 1 to 4, the first and second saw tooth structures 111 and 121 have a plurality of teeth, the plurality of teeth of the first saw tooth structure 111 are sequentially arranged in a circumferential direction of the siphon pipe 11 to have a ring-shaped structure, and the plurality of teeth of the second saw tooth structure 121 are also sequentially arranged in a circumferential direction of the blow pipe 12 to have a ring-shaped structure. In this embodiment, the first and second saw tooth structures 111 and 121 have a plurality of teeth to provide a better breaking effect on the vortex. When the air current in siphon 11 and the blowpipe 12 contacted with the outside air, all can produce the whirlpool in all directions, a plurality of teeth of first sawtooth structure 111 arrange in order to be the loop configuration along siphon 11's circumference, can have better effect of smashing to big whirlpool, further reach the purpose of noise reduction. The plurality of teeth of the second sawtooth structure 121 are also arranged in sequence along the circumferential direction of the blowpipe 12 to form an annular structure, which also has a better breaking effect on the large vortex, and further achieves the purpose of reducing noise.

For the design of the sawtooth structure of the blowpipe and the siphon pipe, the design is required from different angles. During the falling of the hair dryer, since the siphon tube 11 first touches the ground, the possibility of damage to the first sawtooth structure 111 of the siphon tube 11 is higher, and therefore the first sawtooth structure 111 of the siphon tube 11 needs to be more stable and less sharp; and in the hair dryer falling process, the outer diameter of the blowpipe 12 is smaller than that of the siphon 11, the second sawtooth structure 121 of the blowpipe 12 cannot directly contact the ground, and cannot be easily damaged, so that the second sawtooth structure 121 of the blowpipe 12 can be made sharper, and a better noise reduction effect is achieved.

As shown in FIG. 3, each tooth of the first sawtooth structure 111 of the siphon tube 11 has a bottom width of λ₁The height of each tooth of the first saw-tooth structure 111 of the siphon tube 11 is h₁，The first saw tooth structure 111 is used for breaking the large vortex at the outlet end, reducing the vortex amount and reducing the noise, and although the sharper the teeth of the first saw tooth structure 111, the better the noise reduction effect is, it is easy to break, so it is necessary to limit the ratio between the height of the teeth and the bottom width of the teeth, in this embodiment,

as shown in fig. 4, the base width of each tooth of the second serration structure 121 of the blowpipe 12 is λ₂The height of each tooth of the second saw tooth structure 121 of the blow pipe 12 is h₂，Thereby the sawtooth structure of blowpipe 12 is sharper, reaches better noise reduction effect, and the sawtooth structure of siphon 11 is partial to more blunt, compromises its intensity demand.

In addition, the inner diameter of the blowpipe 12 is 50-100mm, and the number of teeth of the sawtooth structure of the blowpipe 12 is 8-30; the inner diameter of the siphon tube 11 is 50-100mm, and the number of teeth of the sawtooth structure of the siphon tube 11 is 12-36. Alternatively, the ratio of the number of teeth of the serration of the blow pipe 12 to the number of teeth of the serration of the siphon pipe 11 is 0.3-1.2.

In a case where the above-mentioned relationship is satisfied, in a specific embodiment, the inner diameter of the siphon tube 11 is larger than the inner diameter of the blow pipe 12, the number of teeth of the siphon tube 11 is larger than the number of teeth of the blow pipe 12, the number of teeth of the siphon tube 11 is 16, and the number of teeth of the blow pipe 12 is 12. Further, the number of teeth of the second serration 121 of the blow pipe 12 is 12, and the number of teeth of the first serration 111 of the siphon tube 11 is 16.

When the hair drier of the embodiment is in the air volume mode, the wind speed is 40m/s-70m/s, the Mach number is 0.1-0.2, and the noise reduction amount of the sharp sound is 1.8db-3.4 db.

Furthermore, it follows from the foregoing analysis that a better noise reduction is obtained when the second serrations 121 of the barrel 12 are made sharper. Therefore, in the foregoing experiments, the inventors also performed experiments to verify this, and thereby obtained table 1, which is the experimental results of comparative examples and examples in which the ratios of the tooth height to the tooth width of two sets of saw-tooth structures are different.

TABLE 1 test results of comparative and example examples in which the tooth height to tooth width ratios of two sets of saw tooth structures are different

As can be seen from table 1, when the ratio of the tooth height to the tooth width of the sawtooth structure is larger, the teeth of the sawtooth structure are sharper, and the noise reduction effect is better. In addition, the actually measured reduction effect on the sharp sound is obviously better than the predicted reduction effect, which is unexpected, and the good noise reduction effect on the sharp sound due to the sawtooth structure can be seen, so that the overall noise of the hair dryer is greatly improved.

The test is carried out when the blower is in the air volume mode, and a good verification effect is obtained. Further verification will be made below with respect to when the blower is in the wind speed mode.

As shown in FIG. 7, in the wind speed mode, the wind speed is 50m/s to 90m/s, the Mach number is 0.15 to 0.27, and the noise reduction of the sharp sound is 1.8db to 3.4 db. Since the siphon tube 11 brings a new noise source, the overall noise in the air volume mode is larger than that in the air velocity mode, and the noise reduction amount in the air volume mode is smaller than that in the air velocity mode.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.