Air outlet piece

Abstract

The utility model provides a low-noise air outlet piece which comprises a shell, an air inlet is formed in the rear side of the shell, an air outlet is formed in the front side of the shell, and a barrel is arranged in the shell; the motor assembly is fixedly contained in the barrel; the fan assembly is fixed to the barrel and the motor assembly, and at least part of the fan assembly is contained in the barrel; the sound absorption assembly is accommodated in the shell; wherein the sound absorption assembly is arranged between the cylinder body and the air inlet, and / or the sound absorption assembly is arranged between the cylinder body and the air outlet. The sound absorption assembly is arranged before the air enters the barrel body and / or after the air leaves the barrel body, scattering and spreading of noise are reduced, turbulence and resistance of airflow are reduced, and the air outlet effect is optimized.

Description

Technical Field

[0001] This application relates to the field of fan technology, specifically to a low-noise air outlet component. Background Technology

[0002] With technological advancements, fans have evolved towards portability and miniaturization. Common portable fans include handheld fans, neck fans, and clip-on fans, all equipped with air outlets, perfectly meeting people's needs while on the go. However, portable fans also come with drawbacks such as low airflow and high noise levels, the noise during use being difficult to ignore and significantly impacting the user experience. Summary of the Invention

[0003] In view of this, this application provides an air outlet component that reduces noise scattering and propagation, reduces airflow turbulence and resistance, and optimizes the air outlet effect by setting sound-absorbing components before entering the cylinder and / or after leaving the cylinder.

[0004] This application provides a low-noise air outlet component, comprising: a housing with an air inlet on the rear side and an air outlet on the front side, and a cylindrical body disposed inside the housing; a motor assembly fixedly housed in the cylindrical body; a fan assembly fixed to the cylindrical body and the motor assembly, and at least partially housed in the cylindrical body; and a sound-absorbing assembly housed inside the housing; wherein the sound-absorbing assembly is disposed between the cylindrical body and the air inlet, and / or the sound-absorbing assembly is disposed between the cylindrical body and the air outlet.

[0005] Furthermore, the sound-absorbing component includes a first sound-absorbing component and a second sound-absorbing component, wherein the first sound-absorbing component is disposed between the cylinder and the air inlet, and the second sound-absorbing component is disposed between the cylinder and the air outlet.

[0006] Furthermore, the first sound-absorbing component includes a first bracket and a first sound-absorbing element. The first bracket is disposed on the rear inner side of the housing, and the first sound-absorbing element is disposed radially between the first bracket and the housing. The first bracket has a plurality of first sound-absorbing holes formed through it.

[0007] Furthermore, a stop member is provided inside the housing, the stop member is radially disposed between the cylinder and the housing, the first bracket is installed from the rear side of the housing to the front, the first bracket abuts against the stop member, and the rear end of the stop member extends rearward beyond or is flush with the rear end of the fan assembly; the inner diameter of the first bracket is 25.5-29.8mm.

[0008] Furthermore, the air inlet includes a first air inlet area and a second air inlet area, with the rear end of the housing forming the first air inlet area and the side wall of the housing forming the second air inlet area corresponding to the first bracket.

[0009] Further, the second sound-absorbing assembly comprises a second support and a second sound-absorbing piece, the second support is arranged on the inner side of the front of the shell, the second sound-absorbing piece is arranged between the second support and the shell, and the second support is provided with a plurality of second sound-absorbing holes.

[0010] Further, a flow guide is arranged on the inner side of the front end of the shell from front to back, and at least part of the flow guide is arranged on the front side of the second support, the flow guide comprises a first outer ring part, a first inner ring part, and a plurality of first connecting leaves connecting the first outer ring part and the first inner ring part, and the first outer ring part is arranged on the inner side of the shell in the radial direction.

[0011] Further, the inner side of the first outer ring part is provided with a first flow guide surface, at least part of the inner side surface of the second support is reduced in the radial direction from back to front, at least part of the first flow guide surface is increased in the radial direction from back to front, and the inner side surface of the second support is smoothly connected with the first flow guide surface; the radial outer side of the first inner ring part is provided with a second flow guide surface, and the second flow guide surface is first increased and then reduced in the radial direction from back to front.

[0012] Further, the axial length of the first sound-absorbing assembly is greater than the axial length of the second sound-absorbing assembly, and the axial length ratio of the first sound-absorbing assembly to the second sound-absorbing assembly is 2-4.

[0013] Further, the cylinder comprises a second outer ring part, a second inner ring part, and a plurality of second connecting leaves connecting the second outer ring part and the second inner ring part, the ratio of the inner diameter of the second outer ring part to the inner diameter of the first sound-absorbing assembly is 0.8-1.2, and the ratio of the inner diameter of the second outer ring part to the inner diameter of the second sound-absorbing assembly is 0.8-1.2.

[0014] Compared with the prior art, the air outlet piece has the following beneficial effects: by arranging the sound-absorbing assembly before entering the cylinder and / or after leaving the cylinder, the scattering and propagation of noise are reduced, the turbulence and resistance of airflow are reduced, and the air outlet effect is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the portable fan of the present application;

[0016] Figure 2 is a schematic view of the portable fan of the present application without the blowing nozzle and the first magnetic attraction piece;

[0017] Figure 3 is a partial exploded view of the portable fan of the present application;

[0018] Figure 4is a cross-sectional view of one angle of the portable fan of the present application;

[0019] Figure 5 is a cross-sectional view of another angle of the portable fan of the present application;

[0020] Figure 6 is an exploded view of the air inlet assembly part of the portable fan of the present application;

[0021] Figure 7 is a perspective view of the flow guide of the present application;

[0022] Figure 8 is a perspective view of the second sound absorbing assembly of the present application;

[0023] Figure 9 is a cross-sectional view of the barrel, motor assembly and fan assembly of the present application;

[0024] Figure 10 is a perspective view of the switch assembly of the present application;

[0025] Figure 11 is a perspective view of the portable fan of the present application with another blowing nozzle. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure, features and effects of the present application, the present application will be further described in conjunction with the drawings and specific embodiments.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element present at the same time.

[0028] In the present application, the description such as "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features.

[0029] In the description of the present application, the terms "front", "back", "left", "right", "up", "down", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] As Figures 1 to 4The diagram shown is a schematic representation of the portable fan of this application. In this embodiment, the portable fan is a handheld fan, comprising an air outlet 100 and a handheld portion 200 connected together. The air outlet 100 includes a housing 1, a cylindrical body 2, a motor assembly 3, and a fan assembly 4. The housing 1 has air intake at the rear and air outlet at the front, and the cylindrical body 2 is fixed inside the housing 1. The motor assembly 3 is fixed to the cylindrical body 2, and the fan assembly 4 is fixed to the cylindrical body 2 and the motor assembly 3, and is at least partially housed within the cylindrical body 2.

[0031] like Figures 1 to 4 As shown, in one embodiment, the air outlet 100 further includes a nozzle 5. The nozzle 5 is fixed to the front end of the housing 1, and the front end of the housing 1 is provided with a first magnetic member 11. The nozzle 5 is provided with a second magnetic member 51 corresponding to the first magnetic member 11. The housing 1 and the nozzle 5 are magnetically fixed together by the first magnetic member 11 and the second magnetic member 51. The housing 1 works in conjunction with the nozzle 5 to achieve different blowing functions through different specifications and forms of the nozzle 5.

[0032] Compared to existing snap-on or screw-on connection methods, the magnetic connection method allows for easy attachment of the nozzle 5 to the air outlet 13 of the housing 1. The nozzle and outlet automatically attach and secure themselves, eliminating the need for complex twisting or snapping operations required by traditional snap-on nozzles. Installation is completed in seconds. Disassembly is equally simple, requiring only a gentle pull to remove the nozzle 5, allowing users to quickly replace it for different design needs. Furthermore, the magnetic attachment ensures a more secure connection between the nozzle 5 and the housing 1, preventing it from easily detaching during use. Even when vigorously swinging the air outlet 100 or moving rapidly, the nozzle 5 remains stable, preventing wear, loosening, or even falling off as with traditional nozzles due to frequent replacements or prolonged use. This improves safety and reduces the potential adverse effects on the equipment or other functions caused by a fallen nozzle. The magnetic components also possess strong resistance to magnetic attenuation, ensuring that the nozzle 5 maintains good adsorption after repeated installation and removal, thus extending its service life. Furthermore, a series of different nozzles 5 can be configured to achieve different functions according to actual needs, such as a nozzle 5 for blowing dust, a nozzle 5 for styling, and so on. Moreover, the detachable design of the magnetically attached nozzle 5 facilitates individual cleaning by the user, helping to maintain the cleanliness and good performance of the air outlet 100.

[0033] like Figure 3 , Figure 4 , Figure 5 and Figure 7As shown in the figure, in one embodiment, the portable fan comprises a flow guide 6, which comprises a first inner ring part 62 and a first outer ring part 61. A plurality of first connecting leaves 63 connects the first inner ring part 62 and the first outer ring part 61, and the first outer ring part 61 is fixed to the front end of the outer shell 1. The outer side of the first outer ring part 61 is formed with a fixed part 64, and the first magnetic attraction part 11 is fixed to the fixed part 64. In this embodiment, the first magnetic attraction part 11 is fixed to the fixed part 64 by screw fixing, and in other embodiments, other fixing methods can also be used. The fixed part 64 and the radially inner side of the front end of the outer shell 1 together form a groove 65, and the first magnetic attraction part 11 is accommodated in the groove 65. By forming the groove 65, the first magnetic attraction part 11 can also be limited between the outer shell 1 and the flow guide 6, the axial movement of the first magnetic attraction part 11 is limited by the fixed part 64, and the radial movement of the first magnetic attraction part 11 is limited by the groove 65 wall, so as to realize the stable fixing of the first magnetic attraction part 11.

[0034] As shown in the figure, Figure 3 , Figure 5 and Figure 7 In one embodiment, at least one of the first magnetic attraction part 11 and the second magnetic attraction part 51 is annular, and at least one of the first magnetic attraction part 11 and the second magnetic attraction part 51 is a magnet. The annular magnet can generate a very uniform magnetic field, and the magnetic field strength is consistent on the entire exposed annular magnet surface. And the magnetic flux path of the annular magnet is closed, the magnetic field is closed, and the magnetic flux almost does not leak out of the magnet, thereby improving the utilization rate of the magnetic field, enhancing the magnetic attraction force, and also reducing the magnetic interference to the surrounding environment. In this embodiment, the material of the first magnetic attraction part 11 is iron, and the material of the second magnetic attraction part 51 is a magnet. In other embodiments, the material of the first magnetic attraction part 11 can be a magnet, and the material of the second magnetic attraction part 51 can be iron; or the materials of the first magnetic attraction part 11 and the second magnetic attraction part 51 can both be magnets.

[0035] Generally speaking, under the same conditions, the attraction of the magnet to the iron is smaller than the attraction of the magnet to the magnet, because the iron is not a permanent magnet, and the magnetic domains inside the iron will partially or completely align with the magnetic field of the magnet under the action of the magnetic field of the magnet, thereby generating an attractive force, but this attractive force is not as large as the attractive force generated by the alignment of the opposite poles of the magnet to the magnet. However, when the magnet attracts the iron, the attraction is relatively stable and does not fluctuate greatly due to the alignment of the magnetic poles as when the magnet attracts the magnet. As long as the ferrous object is within the magnetic field range of the magnet, the magnet will generate a certain attractive force, and the attractive force changes relatively smoothly within a certain distance range. When the magnetic poles of the magnet are not completely aligned, the attractive force will be greatly reduced. However, when the opposite poles of the two magnets are close to each other and completely aligned, the attractive force between them is very strong. In this case, the magnetic domains inside the magnet are aligned in the same direction, which can generate the maximum magnetic flux, thereby generating a strong attractive force.

[0036] In the present embodiment, at least one of the first magnetic attraction member 11 and the second magnetic attraction member 51 is a magnet, wherein the material of the magnet is a neodymium iron boron strong magnet. Neodymium iron boron (Nd-Fe-B) permanent magnet material is currently the highest magnetic permanent magnet material, and the main raw materials include rare earth metal neodymium, metal element iron, non-metallic element boron, and a small amount of dysprosium, niobium, copper and other elements. Further, the material of the magnet is N52 neodymium iron boron strong magnet, which is a high-performance rare earth magnet with a maximum magnetic energy product of 52 MGOe (Mega Gauss-Oersted). This means that it can generate a very strong magnetic force. It is light in weight but strong in magnetic force, and can meet the design requirements of miniaturization and light weight. In addition, N52 neodymium iron boron strong magnet also has high residual magnetism, high coercive force, working temperature range up to 80-100 degrees Celsius, corrosion resistance and other excellent properties, so it has a wide range of applications in many fields. It is one of the strongest magnets on the market. Of course, in other embodiments, the material of the magnet can also be other neodymium iron boron strong magnets or other magnetic materials.

[0037] As Figure 2 , Figure 4 , Figure 5 and Figure 7As shown, in one embodiment, the first magnetic member 11 protrudes forward from the outer shell 1 and the first outer ring portion 61, and the second magnetic member 51 is fixed to the rear side of the nozzle 5, and the inner diameter of the rear end of the nozzle 5 matches the outer diameter of the first magnetic member 11. Since the first magnetic member 11 protrudes forward from the front end of the first outer ring portion 61 and the front end of the outer shell 1, the first magnetic member 11 can normally magnetically attract the second magnetic member 51. Since the inner diameter of the rear end of the nozzle 5 matches the outer diameter of the first magnetic member 11, the rear end of the nozzle 5 can cover part or all of the outer side of the first magnetic member 11, making it more aesthetically pleasing. It should be understood that the first magnetic member 11 and the second magnetic member 51 can directly contact and magnetically attract each other, or can be spaced apart by a plastic shell wall or other element to indirectly magnetically attract each other, as long as the magnetic connection between the first magnetic member 11 and the second magnetic member 51 is not affected.

[0038] As shown in Figure 1 , Figure 3 and Figure 4 , the nozzle 5 includes a first nozzle 5a, which is radially reduced from rear to front, and the front end of the first nozzle 5a is oval-shaped, and a bristle 52 is fixed to the front end of the first nozzle 5a, and the bristle 52 is arranged side by side with the blowing port of the first nozzle 5a. The first nozzle 5a has a dust blowing function, and the bristle 52 can further remove dust. Of course, the bristle 52 can also be directly arranged at the blowing port of the first nozzle 5a, and the wind blows out from the gap between the bristles 52. The axial length of the first nozzle 5a is 31-35.9mm, and the axial length of the first nozzle 5a is relatively short, reducing wind loss and improving blowing efficiency.

[0039] As shown in Figure 11 , the nozzle 5 includes a second nozzle 5b, which is radially reduced from rear to front, and the inner diameter of the rear end of the second nozzle 5b is 23-40mm, and the front end of the second nozzle 5b is circular-shaped, and the inner diameter of the front end of the second nozzle 5b is 14-18mm, so it can be seen that the second nozzle 5b has a strong wind gathering function. Moreover, the axial length of the second nozzle 5b is 60-64.7mm, and the axial length of the second nozzle 5b is relatively long, and the wind pressure and blowing distance are further improved.

[0040] As shown in Figure 2 , Figure 4 and Figure 5As shown, in one embodiment, the housing 1 is formed with an air inlet cavity 14 at the rear end of the fan assembly 4, and an air inlet assembly is detachably mounted at the rear end of the air inlet cavity 14. The air inlet assembly is detachably mounted at the rear end, so as to facilitate user cleaning and maintenance, and the user can detach the air inlet assembly for certain personalized customization operation. The detachable air inlet assembly can also be better fixed in design, reducing the risk of loosening and falling off due to vibration and other reasons during use. The air inlet assembly includes a first sound-absorbing assembly 7 and a rear cover assembly 9. The first sound-absorbing assembly 7 includes a first support 71 and a first sound-absorbing piece 72. The first sound-absorbing assembly 7 is arranged at the inner rear side of the housing 1, and the first sound-absorbing piece 72 is arranged between the first support 71 and the housing 1 in the radial direction. The first support 71 and the housing 1 are hard elements, which can better play a supporting and shaping role. Therefore, arranging the first sound-absorbing piece 72 between the first support 71 and the housing 1 can be more secure and stable.

[0041] In this embodiment, the material of the first sound-absorbing piece 72 is metal material. Metal material has good sound insulation and sound absorption performance, which can effectively reduce the propagation and reflection of sound. In other embodiments, the material of the first sound-absorbing piece 72 can be organic fiber material, inorganic fiber material, cotton, foamed plastic, sponge, perforated plate, leather, rubber, plastic, etc.

[0042] As shown in FIG. 1, the first sound-absorbing piece 72 is arranged between the first support 71 and the housing 1 in the radial direction. The first support 71 and the housing 1 are hard elements, which can better play a supporting and shaping role. Therefore, arranging the first sound-absorbing piece 72 between the first support 71 and the housing 1 can be more secure and stable. Figure 2 、 Figure 4 、 Figure 5 and Figure 6As shown in the drawings, in one embodiment, a plurality of first sound-absorbing holes 711 are formed through the first support 71, a plurality of first micro-holes (not shown, the same below) are formed on the first sound-absorbing member 72, and a plurality of side air inlets 121 are formed through the shell 1 corresponding to the first support 71. The first support 71, the first sound-absorbing member 72, and the shell 1 corresponding to the position of the first support 71 are all provided with through holes. However, the first sound-absorbing holes 711 and the first micro-holes are arranged in a staggered manner, the first micro-holes and the side air inlets 121 are arranged in a staggered manner, and the first sound-absorbing holes 711 and the side air inlets 121 are arranged in a staggered manner. It should be understood that the staggered arrangement not only refers to the misalignment of positions, but also refers to the staggered arrangement caused by the different sizes of the apertures of the first sound-absorbing holes 711, the first micro-holes, and the side air inlets 121. The first sound-absorbing holes 711, the first micro-holes, and the side air inlets 121 are all arranged in a staggered manner, which can effectively prevent dust, impurities, hair, and the like from entering the air inlet cavity 14. In addition, when the portable fan is started, air flows at a high speed, and the staggered arrangement of the air inlet structure can avoid the strong impact of high-speed fluid, increase the stability of the structure, guide the high-speed fluid to tilt in, increase the total area of the air inlet in a limited space, and further improve the air intake; the staggered arrangement also helps to make the entering air more evenly distributed in the air inlet cavity 14, avoids the occurrence of local airflow that is too strong or too weak, realizes more accurate airflow control, reduces turbulence, reduces energy loss, and makes the air flow more stable.

[0043] As shown in the drawings, Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown in the drawings, in one embodiment, the rear side of the first support 71 is provided with a mounting portion 712, and the rear cover assembly 9 is mounted on the mounting portion 712. The rear cover assembly 9 includes a rear frame 91, the rear frame 91 and the first support 71 sandwiching the air inlet net 15, the rear frame 91 corresponding to the air inlet net 15 is provided with a rear air inlet 122, and the air inlet net 15 is provided with a plurality of second micro-holes (not shown, the same below), and the aperture of the second micro-holes is 0.225-1mm. The second micro-holes have small apertures, good filtering effect, good safety performance, low airflow speed, and uniform airflow distribution, and good airflow stability. The air inlet 12 includes the side air inlets 121 and the rear air inlets 122, adopts air inlet channels in two directions of the rear and the side, provides multi-angle air inlets, thereby forming a three-dimensional and large-air-volume air inlet mode, so that the portable fan can obtain stable and large air volume. The axial length of the side air inlets 121 accounts for 1 / 4-2 / 3 of the axial length of the shell 1, preferably 1 / 3-1 / 2, thereby ensuring sufficient air inlet area and ensuring the final air outlet effect.

[0044] AsFigures 4 to 6 As shown in the drawings, in one embodiment, the first sound-absorbing member 72 is fixed to the rear frame 91, and the housing 1 and the first sound-absorbing member 72 have a space therebetween, and the first sound-absorbing member 72 and the first support 71 have a space therebetween. Through the fixing effect of the rear frame 91, the housing 1, the first sound-absorbing member 72 and the first support 71 are formed with spaces therebetween, thereby forming the side air inlet 121, the space between the housing 1 and the first sound-absorbing member 72, the first micro-hole, the space between the first sound-absorbing member 72 and the first support 71, and the air flow passage of the first sound-absorbing hole 711. Of course, in other embodiments, the first sound-absorbing member 72 can also be fixed to the first support 71.

[0045] As shown in the drawings, Figures 4 to 6 As shown in the drawings, in one embodiment, the diameter of the first sound-absorbing hole 711 is greater than the diameter of the side air inlet 121, and the diameter of the side air inlet 121 is greater than the diameter of the first micro-hole. By setting different diameters, the dislocation is further enhanced, and the appearance of the technology is enhanced. The diameter of the first sound-absorbing hole 711 is 1.9-2.7 mm, the diameter of the side air inlet 121 is 0.9-1.7 mm, and the diameter of the first micro-hole is 0.4-0.8 mm.

[0046] As shown in the drawings, Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown in the drawings, the housing 1 contains a sound-absorbing assembly, which is arranged between the cylinder 2 and the air inlet 12 and / or between the cylinder 2 and the air outlet 13. In this embodiment, the sound-absorbing assembly is arranged between the cylinder 2 and the air inlet 12 and between the cylinder 2 and the air outlet 13. The sound-absorbing assembly includes a first sound-absorbing assembly 7 and a second sound-absorbing assembly 8, the first sound-absorbing assembly 7 is arranged between the cylinder 2 and the air inlet 12, and the second sound-absorbing assembly 8 is arranged between the cylinder 2 and the air outlet 13. The sound-absorbing assembly is arranged before entering the cylinder 2 and after leaving the cylinder 2, which can effectively absorb and block the noise generated by the operation of the fan assembly 4 and the motor assembly 3. This double sound-absorbing design can reduce the scattering and propagation of noise, especially when the motor assembly 3 is running at high speed, the noise reduction effect is more obvious. In addition, the arrangement of the sound-absorbing assembly optimizes the air inlet and outlet, which can make the air flow more stable, reduce the turbulence and resistance of the air flow, and this optimization not only reduces the noise, but also improves the heat dissipation efficiency.

[0047] As shown in the drawings, Figures 4 to 6As shown in the drawings, in one embodiment, the air inlet 12 comprises a first air inlet area and a second air inlet area, the rear end of the shell 1 forms the first air inlet area, and the side wall of the shell 1 corresponding to the first support 71 forms the second air inlet area. The rear air inlet 122 corresponds to the first air inlet area, and the side air inlet 121 corresponds to the second air inlet area. The rear air inlet can provide straight flow, the side air inlet can reduce the direct impact of airflow, and the combination of the rear air inlet and the side air inlet can provide good air inlet performance and facilitate the provision of sufficient effective air inlet area in a small portable fan.

[0048] As shown in the drawings, Figure 4 , Figure 5 and Figure 8 , in one embodiment, the second sound absorption assembly 8 comprises a second support 81 and a second sound absorption piece 82. The second support 81 is arranged on the inner front side of the shell 1, the second sound absorption piece 82 is arranged between the second support 81 and the shell 1, and the second support 81 is provided with a plurality of second sound absorption holes 811.

[0049] As shown in the drawings, Figure 2 , Figure 4 , Figure 5 and Figure 7 , in one embodiment, the flow guide piece 6 is mounted on the inner front side of the front end of the shell 1 from front to back, and at least part of the flow guide piece 6 is arranged on the front side of the second support 81, and at least part of the flow guide piece 6 is arranged on the front side of the second support 81. The radial inner side of the first outer ring part 61 is provided with a first flow guide surface 611, at least part of the first flow guide surface 611 radially increases from back to front. The radial outer side of the first inner ring part 62 is provided with a second flow guide surface 621, at least part of the second flow guide surface 621 radially decreases from back to front, and the front end of the first flow guide surface 611 exceeds the front end of the second flow guide surface 621. At least part of the inner side surface of the second support 81 radially decreases from back to front, at least part of the first flow guide surface 611 radially increases from back to front, and the inner side surface of the second support 81 is smoothly connected with the first flow guide surface 611. Meanwhile, in this embodiment, the second flow guide surface 621 first radially increases and then radially decreases from back to front, and the part of the second flow guide surface 621 radially increasing corresponds to the part of the second support 81 radially decreasing from back to front; the part of the second flow guide surface 621 radially decreasing corresponds to the part of the first flow guide surface 611 radially increasing. That is, the second flow guide surface 621, the inner side surface of the second support 81 and the first flow guide surface 611 form a flow channel which first decreases and then increases from back to front.

[0050] This design of first reducing and then increasing is a common aerodynamic optimization strategy, usually referred to as the application of "Venturi Effect". This design converts part of the static pressure into kinetic energy, and then partially restores the kinetic energy to static pressure, thereby optimizing the flow characteristics of the air flow. In the narrowing section, the air flow rate increases, which can more efficiently exhaust the air, especially suitable for scenarios that require rapid ventilation; in the expanding section, the air flow rate gradually decreases, and the pressure recovers, thereby reducing energy loss and improving the overall efficiency of the system; by optimizing the flow characteristics of the air flow, reducing air flow turbulence and impact, thereby reducing the noise of the system during operation; better control of air flow distribution, making the air flow more evenly diffuse to the target area, reducing vortex and resistance of air flow near the air outlet 13.

[0051] Of course, in other embodiments, the second flow guide surface 621 can also increase radially from back to front, or first increase radially from back to front, and then remain unchanged radially, without being limited by the examples.

[0052] As shown in Figure 4 , Figure 5 , Figure 6 and Figure 8 , in one embodiment, the axial length of the first sound absorption assembly 7 is greater than the axial length of the second sound absorption assembly 8, and the axial length ratio of the first sound absorption assembly 7 to the second sound absorption assembly 8 is 2-4. The air flow speed and pressure at the inlet are usually higher than at the outlet, so a longer first sound absorption assembly 7 is needed to handle high-energy air flow. The longer first sound absorption assembly 7 can reduce air resistance while reducing noise by reasonable design structure (such as multi-layer staggered inlet structure). While the noise at the outlet is mainly caused by mechanical vibration of the motor assembly 3 and the fan assembly 4 and secondary disturbance of the air flow, the design of the second sound absorption assembly 8 at the outlet focuses more on absorbing high-frequency noise. In this embodiment, the second sound absorption piece 82 in the second sound absorption assembly 8 is sound absorption cotton, which has good noise absorption effect. Of course, in other embodiments, the second sound absorption assembly 8 can be organic fiber material, inorganic fiber material, cotton, foamed plastic, sponge, perforated plate, leather, rubber, plastic, metal, etc. Designing the axial length of the second sound absorption assembly 8 to be 1 / 4-1 / 2 of the axial length of the first sound absorption assembly 7 can reduce the overall axial length of the air outlet piece 100, thereby reducing the overall volume of the portable fan.

[0053] As shown in Figures 3 to 5As shown in the drawings, in one embodiment, the housing 1 is provided with a stopper 101. The stopper 101 is radially arranged between the cylinder body 2 and the housing 1. The first support 71 is mounted from the rear side of the housing 1 to the front. The first support 71 abuts against the stopper 101. The rear end of the stopper 101 is rearward beyond or flush with the rear end of the fan assembly 4. The stopper 101 radially fixes the cylinder body 2 and axially abuts against the first support 71, thereby forming the air inlet cavity 14 and the area of the cylinder body 2. The stopper 101 is rearward beyond or flush with the rear end of the fan assembly 4, so that the fan assembly 4 does not excessively affect the fluid in the air inlet cavity 14. The stopper 101 also abuts against the rear end of the cylinder body 2, so that the cylinder body 2 and the first support 71 are not dislocated or shifted.

[0054] As shown in the drawings, Figures 4 to 6 In one embodiment, the inner diameter of the first support 71 is 25.5-29.8 mm, and the inner diameter of the second support 81 is 25.9-28.4 mm. The cylinder body 2 comprises a second outer ring portion 21, a second inner ring portion 22, and a plurality of second connecting leaves 23 connecting the second outer ring portion 21 and the second inner ring portion 22. The ratio of the inner diameter of the second outer ring portion 21 to the inner diameter of the first sound-absorbing assembly 7 is 0.8-1.2, and the ratio of the inner diameter of the second outer ring portion 21 to the inner diameter of the second sound-absorbing assembly 8 is 0.8-1.2. The inner diameter of the first sound-absorbing assembly 7, i.e. the inner diameter of the first support 71, and the inner diameter of the second sound-absorbing assembly 8, i.e. the inner diameter of the second support 81. That is, the inner diameters of the first support 71, the second outer ring portion 21 and the second support 81 are approximately equal or not much different, so that the overall air duct is more smooth. The inner diameters of the first support 71, the second outer ring portion 21 and the second support 81 are relatively small, so that the overall volume of the air outlet 100 is small, which is convenient for users to carry.

[0055] As shown in the drawings, Figure 9 In one embodiment, the cylinder body 2 further comprises a buffer 24 made of soft rubber. The buffer 24 is fixed to the outside of the second outer ring portion 21, so that the cylinder body 2 is better fixed in the stopper 101. Of course, in other embodiments, the buffer 24 can not be provided. Figure 4 , Figure 5 and Figure 9As shown, the motor assembly 3 is an outer rotor motor, which comprises a stator assembly 31 and a rotor assembly 32. The rotor assembly 32 comprises a rotating shaft 321, a bearing 322, a magnetic ring 323 and a housing 324. The fan assembly 4 comprises a hub 41 and a plurality of blades 42 arranged around the hub 41 radially outward. One end of the rotating shaft 321 is fixed to the inner side of the second inner ring portion 22, and the other end of the rotating shaft 321 is fixed to the hub 41. The bearing 322 is arranged on the outer side of the rotating shaft 321 and is also fixed to the inner side of the second inner ring portion 22. The magnetic ring 323 is fixed to the radially inner side of the housing 324 and is arranged on the radially outer side of the stator assembly 31. The housing 324 is directly fixed to the rotating shaft 321, so that the rotating shaft 321, the housing 324 and the magnetic ring 323 can rotate synchronously. By arranging the motor assembly 3 in the form of an outer rotor, the fan assembly 4 is directly driven to rotate, and the motor assembly 3 is arranged reasonably.

[0056] As shown in Figure 4 and Figure 10 In one embodiment, a rechargeable battery 201 is arranged in the handheld portion 200, which supplies power to drive the motor assembly 3. The handheld portion 200 is provided with a switch assembly 202, which comprises a stepless adjusting member 2021, a pressing member 2022 and an adjusting plate 2023. The stepless adjusting member 2021 and the pressing member 2022 are electrically connected with the adjusting plate 2023. It should be understood that the stepless adjusting member 2021 is also matched with an encoder 2024, which is connected with an air volume adjusting circuit. When the stepless adjusting member 2021 is rolled, the encoder 2024 outputs a digital signal, so as to realize stepless adjustment of the air volume of the portable fan.

[0057] A main circuit board 203 is arranged in the handheld portion 200, which is electrically connected with the rechargeable battery 201, the adjusting plate 2023 and one or more circuit boards in the air outlet member 100. In the present embodiment, the air outlet member 100 is provided with two circuit boards, one of which is arranged at the front end of the second inner ring portion 22, and the other of which is arranged at the front end of the first inner ring portion 62. The circuit board arranged at the front end of the second inner ring portion 22 is used to connect the motor assembly 3, so as to drive the fan assembly 4. The circuit board arranged at the front end of the first inner ring portion 62 is used to display the air volume, the power, the gear and the like. In front of the circuit board, a display screen (not numbered) is also arranged, which is used to display the corresponding values through light transmission.

[0058] As shown in Figures 4 to 6As shown, in one embodiment, the rear frame 91 is further provided with a light-transmitting portion 92, the mounting portion 712 is mounted with a light-emitting member 10, the light-emitting member 10 emits light rearward through the light-transmitting portion 92. Thus, the portable fan also has the function of lighting, which enriches the function of the portable fan. The light-transmitting portion 92 is arranged at the center of the rear frame 91, the light-emitting member is also arranged at the center of the mounting portion 712, the rear air inlet 122 is arranged at the radial outer side of the light-transmitting portion 92 of the rear frame 91, and corresponds to the blade 42 of the fan assembly 4, thereby facilitating the formation of straight-flow blowing.

[0059] The above detailed description is only a description of the preferred embodiments of the present application, and does not limit the patent scope of the present application. Therefore, any equivalent technical changes made according to the description and drawings of the present application are included in the patent scope of the present application.

Claims

1. An air outlet member characterized by, include: The outer casing has an air inlet on the rear side and an air outlet on the front side, and a cylindrical body is located inside the outer casing. The motor assembly is fixedly housed within the cylindrical body; A fan assembly is fixed to the cylinder and the motor assembly, and is at least partially housed within the cylinder; The sound-absorbing components are housed within the housing; The sound-absorbing component is disposed between the cylinder and the air inlet, and / or the sound-absorbing component is disposed between the cylinder and the air outlet.

2. The air outlet member of claim 1, wherein: The sound-absorbing component includes a first sound-absorbing component and a second sound-absorbing component. The first sound-absorbing component is disposed between the cylinder and the air inlet, and the second sound-absorbing component is disposed between the cylinder and the air outlet.

3. The air outlet member of claim 2, wherein: The first sound-absorbing component includes a first bracket and a first sound-absorbing element. The first bracket is located on the rear inner side of the housing, and the first sound-absorbing element is located radially between the first bracket and the housing. The first bracket has a plurality of first sound-absorbing holes through it.

4. The air outlet member of claim 3, wherein: The housing is provided with a stop member, which is radially disposed between the cylinder and the housing. The first bracket is installed from the rear side of the housing to the front. The first bracket abuts against the stop member. The rear end of the stop member extends rearward beyond or is flush with the rear end of the fan assembly. The inner diameter of the first bracket is 25.5-29.8 mm.

5. The air outlet member of claim 3, wherein: The air inlet includes a first air inlet area and a second air inlet area. The rear end of the outer casing forms the first air inlet area, and the side wall of the outer casing forms the second air inlet area corresponding to the first bracket.

6. The air outlet member of claim 2, wherein: The second sound-absorbing component includes a second bracket and a second sound-absorbing element. The second bracket is located on the front inner side of the housing, and the second sound-absorbing element is located between the second bracket and the housing. The second bracket has a plurality of second sound-absorbing holes through it. The inner diameter of the second bracket is 25.9-28.4 mm.

7. The air outlet member of claim 6, wherein: It also includes a flow guide, which is installed from front to back on the inner side of the front end of the housing, and at least a portion of the flow guide is disposed on the front side of the second bracket. The flow guide includes a first outer ring portion, a first inner ring portion, and a plurality of first connecting leaves connecting the first outer ring portion and the first inner ring portion. The first outer ring portion is disposed on the radial inner side of the housing.

8. The air outlet member of claim 7, wherein: The first outer ring portion has a first guide surface on its radially inner side, at least a portion of the inner side of the second bracket is radially reduced from back to front, at least a portion of the first guide surface is radially increased from back to front, and the inner side of the second bracket is smoothly connected to the first guide surface; the first inner ring portion has a second guide surface on its radially outer side, the second guide surface is radially increased first from back to front and then radially reduced.

9. The air outlet member of claim 2, wherein: The axial length of the first sound-absorbing component is greater than the axial length of the second sound-absorbing component, and the ratio of the axial length of the first sound-absorbing component to that of the second sound-absorbing component is 2-4.

10. The air outlet member of claim 2, wherein: The cylinder includes a second outer ring, a second inner ring, and a plurality of second connecting blades connecting the second outer ring and the second inner ring. The ratio of the inner diameter of the second outer ring to the inner diameter of the first sound-absorbing component is 0.8-1.2.

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