Air outlet piece

Abstract

The invention 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] The present application relates to the technical field of fans, and in particular to a low-noise air outlet. Background Art

[0002] With the development of technology, fans are also moving towards portability and miniaturization. Common portable fans include handheld fans, neck fans, clip fans, etc., all of which are equipped with air outlets. Portable fans perfectly meet people's needs for travel. However, portable fans also have the disadvantages of small air volume and high noise. The noise during use is difficult to ignore, which greatly affects the user experience. Summary of the invention

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

[0004] The present application provides a low-noise air outlet, comprising: an outer shell, with an air inlet provided on the rear side and an air outlet provided on the front side, a cylinder provided inside the outer shell; a motor assembly fixedly accommodated in the cylinder; a fan assembly fixed to the cylinder and the motor assembly, and at least partially accommodated in the cylinder; a sound absorbing assembly accommodated in the outer shell; wherein the sound absorbing assembly is arranged between the cylinder and the air inlet, and / or the sound absorbing assembly is arranged between the cylinder and the air outlet.

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

[0006] Furthermore, the first sound absorbing component includes a first bracket and a first sound absorbing member, the first bracket is arranged on the rear inner side of the shell, the first sound absorbing member is arranged between the first bracket and the shell in the radial direction, and the first bracket is penetrated by a plurality of first sound-absorbing holes.

[0007] Furthermore, a stopper is provided in the outer shell, and the stopper is radially arranged between the cylinder and the outer shell. The first bracket is installed forward from the rear side of the outer shell, and the first bracket resists the stopper. The rear end of the stopper extends backward 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. The rear end of the shell forms the first air inlet area, and the side wall of the shell forms the second air inlet area corresponding to the first bracket.

[0009] Furthermore, the second sound absorbing assembly includes a second bracket and a second sound absorbing member, the second bracket is arranged on the front inner side of the shell, the second sound absorbing member is arranged between the second bracket and the shell, and the second bracket is penetrated by a plurality of second sound-absorbing holes; the inner diameter of the second bracket is 25.9-28.4 mm.

[0010] Furthermore, it also includes a guide member, which is installed on the inner side of the front end of the outer shell from front to rear, and at least part of the guide member is arranged on the front side of the second bracket, and the guide member 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, and the first outer ring portion is arranged on the radial inner side of the outer shell.

[0011] Furthermore, a first guide surface is provided on the radial inner side of the first outer ring portion, at least a portion of the inner side surface of the second bracket radially decreases from the back to the front, at least a portion of the first guide surface radially increases from the back to the front, and the inner side surface of the second bracket is smoothly connected to the first guide surface; a second guide surface is provided on the radial outer side of the first inner ring portion, and the second guide surface first radially increases from the back to the front and then radially decreases.

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

[0013] Furthermore, the cylinder includes a second outer ring portion, a second inner ring portion, and a plurality of second connecting leaves connecting the second outer ring portion and the second inner ring portion, the ratio of the inner diameter of the second outer ring portion to the inner diameter of the first sound absorbing component is 0.8-1.2, and the ratio of the inner diameter of the second outer ring portion to the inner diameter of the second sound absorbing component is 0.8-1.2.

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

[0015] Figure 1 is a three-dimensional diagram of the portable fan of the present application;

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

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

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

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

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

[0021] Figure 7 is a three-dimensional diagram of the flow guide member of the present application;

[0022] Figure 8 is a three-dimensional diagram of the second sound absorbing assembly of the present application;

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

[0024] Fig.10 is a three-dimensional diagram of the switch assembly of the present application;

[0025] Fig.11 It is a three-dimensional diagram of the portable fan of the present application with another blowing nozzle. DETAILED DESCRIPTION

[0026] In order to facilitate a better understanding of the purpose, structure, features, and functions of the present application, the present application is further described in conjunction with the accompanying drawings and specific implementation methods.

[0027] It should be noted that when an element is considered to be “connected to” another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0028] In this application, descriptions such as “first”, “second”, etc. are only used for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating 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", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0030] like Figures 1 to 4, which is a schematic diagram of the portable fan of the present application. In the present embodiment, the portable fan is a handheld fan, and the portable fan comprises an air outlet 100 and a handheld portion 200 connected to each other. The air outlet 100 comprises a housing 1, a barrel 2, a motor assembly 3 and a fan assembly 4. The housing 1 has air intake at the rear side and air outlet at the front side, and the barrel 2 is fixed in the housing 1. The motor assembly 3 is fixed to the barrel 2, and the fan assembly 4 is fixed to the barrel 2 and the motor assembly 3, and is at least partially accommodated in the barrel 2.

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

[0032] Compared with the existing snap-on or screw-on connection methods, the magnetic connection method only requires gently aligning the mouthpiece 5 with the air outlet 13 of the shell 1, and the two can be automatically adsorbed and fixed, without the need for complicated screwing or snap-on operations like the traditional snap-on mouthpiece 5, and the installation can be completed in a few seconds. When disassembling, the mouthpiece 5 can be removed with a light pull, which is convenient for users to quickly replace the mouthpiece 5 according to different styling requirements. In addition, the mouthpiece 5 fixed by magnetic attraction is more firmly connected to the shell 1 due to the magnetic adsorption effect, and is not easy to fall off during use. Even when the air outlet piece 100 is vigorously waved or moved quickly, the mouthpiece 5 can remain stable, avoiding the wear, looseness or even falling of the traditional mouthpiece 5 due to frequent replacement or long-term use, thereby improving the safety of use and reducing the adverse effects on the equipment or other effects caused by the falling of the mouthpiece 5. The magnetic component also has a strong ability to resist magnetic force attenuation, ensuring that the nozzle 5 can still maintain a good adsorption effect after multiple installations and removals, thereby extending the service life of the nozzle 5. In addition, a series of different nozzles 5 can be provided to achieve different functions according to actual needs, such as providing the nozzle 5 for blowing dust, and providing the nozzle 5 for modeling design, which is not limited to the examples. In addition, due to the detachable design of the magnetic suction nozzle 5, it is convenient for users to clean it separately, which helps to keep the air outlet 100 clean and in good performance.

[0033] like Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, in one embodiment, the portable fan includes a guide member 6, and the guide member 6 includes a first inner ring portion 62 and a first outer ring portion 61. A plurality of first connecting leaves 63 connect the first inner ring portion 62 and the first outer ring portion 61, and the first outer ring portion 61 is fixed to the front end of the housing 1. A fixing portion 64 is formed on the outer side of the first outer ring portion 61, and the first magnetic member 11 is fixed to the fixing portion 64. In this embodiment, the first magnetic member 11 is fixed to the fixing portion 64 by screw fixing. In other embodiments, other fixing methods can also be used. The fixing portion 64 and the radial inner side of the front end of the housing 1 jointly form a groove 65, and the first magnetic member 11 is accommodated in the groove 65. By forming the groove 65, the first magnetic member 11 can also be limited between the housing 1 and the guide member 6, the axial movement of the first magnetic member 11 is limited by the fixing portion 64, and the radial movement of the first magnetic member 11 is limited by the wall of the groove 65, thereby achieving stable fixation of the first magnetic member 11.

[0034] like Figure 3 , Figure 5 and Figure 7 As shown, in one embodiment, at least one of the first magnetic member 11 and the second magnetic member 51 is annular, and at least one of the first magnetic member 11 and the second magnetic member 51 is a magnet. The annular magnet can generate an extremely uniform magnetic field, and the magnetic field strength is consistent on the entire exposed annular magnet surface. In addition, the magnetic flux path of the annular magnet is closed, the magnetic field is well closed, and the magnetic flux hardly leaks out of the magnet, thereby improving the utilization rate of the magnetic field, enhancing the magnetic attraction, and also reducing the magnetic interference to the surrounding environment. In this embodiment, the material of the first magnetic member 11 is iron, and the material of the second magnetic member 51 is a magnet. In other embodiments, the material of the first magnetic member 11 may be a magnet, and the material of the second magnetic member 51 may be iron; or the material of the first magnetic member 11 and the second magnetic member 51 may both be magnets.

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

[0036] In this 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 Nd-Fe-B strong magnet. Nd-Fe-B permanent magnet material is the permanent magnet material with the highest magnetic properties at present. The main raw materials include rare earth metal neodymium, metal element iron, non-metallic element boron, and a small amount of iron frame dysprosium, niobium, copper and other elements. Furthermore, the material of the magnet is N52 Nd-Fe-B strong magnet. N52 Nd-Fe-B strong magnet is a high-performance rare earth magnet with a maximum magnetic energy product of 52MGOe (Mega Gauss-Oersted), which means that it can generate very strong magnetic force; and it is light in weight but has strong magnetic force, which can meet the design requirements of miniaturization and lightweight. In addition, N52 NdFeB magnets also have excellent properties such as high remanence, high coercivity, working temperature range of 80-100 degrees Celsius, corrosion resistance, etc. Therefore, they are widely used in many fields and are one of the strongest magnets on the market. Of course, in other embodiments, the material of the magnet can also be other NdFeB magnets or other magnetic materials.

[0037] like Figure 2 , Figure 4 , Figure 5 and Figure 7As shown, in one embodiment, the first magnetic member 11 protrudes forward from the housing 1 and the first outer ring portion 61, and the second magnetic member 51 is fixed to the rear side of the mouthpiece 5, and the inner diameter of the rear end of the mouthpiece 5 matches the outer diameter of the first magnetic member 11. As the first magnetic member 11 protrudes forward from the front end of the first outer ring portion 61 and the front end of the housing 1, the first magnetic member 11 can normally magnetically match the second magnetic member 51. The inner diameter of the rear end of the mouthpiece 5 matches the outer diameter of the first magnetic member 11, and the rear end of the mouthpiece 5 can cover part or all of the outer side of the first magnetic member 11, making its appearance more beautiful. It should be understood that the first magnetic member 11 and the second magnetic member 51 can be directly in contact with each other for magnetic attraction, or they can be separated by a plastic shell wall or other components for indirect magnetic attraction, as long as the magnetic connection between the first magnetic member 11 and the second magnetic member 51 is not affected.

[0038] like Figure 1 , Figure 3 and Figure 4 As shown, the nozzle 5 includes a first nozzle 5a, which is radially reduced from the back to the front, and the front end of the first nozzle 5a is elliptical, and a bristle 52 is fixed to the front end of the first nozzle 5a, and the bristle 52 is arranged in parallel with the air outlet 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 set at the air outlet of the first nozzle 5a, and the wind is blown 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 short, which reduces wind loss and has better blowing efficiency.

[0039] like Fig.11 As shown, the nozzle 5 includes a second nozzle 5b, which is radially reduced from the back to the front, and the inner diameter of the rear end of the second nozzle 5b is 23-40mm. The front end of the second nozzle 5b is round, and the inner diameter of the front end of the second nozzle 5b is 14-18mm. It can be seen that the second nozzle 5b has a strong wind gathering function. In addition, the axial length of the second nozzle 5b is 60-64.7mm, and the axial length of the second nozzle 5b is longer, and the wind pressure and air supply distance are further improved.

[0040] like 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 the air inlet assembly is detachably mounted on the air inlet cavity 14. The air inlet assembly is detachably mounted on the rear end, so as to facilitate cleaning and maintenance by the user, and the user can remove the air inlet assembly for certain personalized customization operations. 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 bracket 71 and a first sound absorbing member 72, the first sound absorbing assembly 7 is arranged on the rear inner side of the housing 1, and the first sound absorbing member 72 is arranged between the first bracket 71 and the housing 1 in the radial direction. The first bracket 71 and the housing 1 are hard components, which can better play a supporting and shaping role, so the first sound absorbing member 72 is arranged between the first bracket 71 and the housing 1, which can be safer and more reliable.

[0041] In this embodiment, the material of the first sound absorbing member 72 is a metal material, which has good sound insulation and sound absorption properties and can effectively reduce the propagation and reflection of sound. In other embodiments, the material of the first sound absorbing member 72 can be organic fiber material, inorganic fiber material, cotton, foam plastic, sponge, perforated plate, leather, rubber, plastic and the like.

[0042] like Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, in one embodiment, a plurality of first silencer holes 711 are formed through the first bracket 71, a plurality of first micropores (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 bracket 71. The first bracket 71, the first sound absorbing member 72 and the position of the shell 1 corresponding to the first bracket 71 are all provided with through holes. However, the first silencer hole 711 and the first micropore are staggered, the first micropore and the side air inlet 121 are staggered, and the first silencer hole 711 and the side air inlet 121 are staggered. It should be understood that the staggered setting refers not only to the misalignment of the position, but also to the misalignment formed by the different aperture sizes among the first silencer hole 711, the first micropore and the side air inlet 121. The first silencer hole 711, the first micropore and the side air inlet 121 are all staggered, which can well prevent dust, impurities, hair, etc. from entering the air inlet cavity 14. In addition, when the portable fan is started, the air flows at a high speed, and the staggered air inlet structure can avoid the strong impact of the high-speed fluid, thereby increasing the stability of the structure; and can guide the high-speed fluid to inlet at an angle, thereby increasing the total air inlet area within a limited space, and further improving the amount of air intake; the staggered setting can also help to make the incoming air more evenly distributed in the air inlet cavity 14, thereby avoiding the situation where the local airflow is too strong or too weak, achieving more precise airflow control, reducing turbulence, reducing energy loss, and making the air flow smoother.

[0043] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, in one embodiment, a mounting portion 712 is provided on the rear side of the first bracket 71, and the rear cover assembly 9 is installed on the mounting portion 712. The rear cover assembly 9 includes a rear frame 91, and the rear frame 91 and the first bracket 71 are sandwiched with an air inlet net 15. The rear frame 91 is provided with a rear air inlet 122 corresponding to the air inlet net 15, and the air inlet net 15 is provided with a plurality of second micropores (not shown, the same below), and the aperture of the second micropores is 0.225-1mm. The aperture of the second micropores is small, the filtering effect is good, foreign matter is prevented from entering, and the safety performance is good; the air flow velocity is reduced and the air flow is evenly distributed, and the air flow stability is enhanced. The air inlet 12 includes a side air inlet 121 and a rear air inlet 122, and adopts air inlet channels in the rear and side directions to provide multi-angle air inlet, thereby forming a three-dimensional, large air volume air inlet method, so that the portable fan can obtain a stable large air volume. The axial length of the side air inlet 121 accounts for 1 / 4-2 / 3 of the axial length of the housing 1, preferably 1 / 3-1 / 2, so as to ensure sufficient air inlet area and the final air outlet effect.

[0044] like Figures 4 to 6 As shown, in one embodiment, the first sound absorbing member 72 is fixed to the rear frame 91, and there is a gap between the housing 1 and the first sound absorbing member 72, and there is a gap between the first sound absorbing member 72 and the first bracket 71. Through the fixing effect of the rear frame 91, the housing 1, the first sound absorbing member 72 and the first bracket 71 form a gap between the adjacent two, thereby forming the side air inlet 121, the gap between the housing 1 and the first sound absorbing member 72, the first micropores, the gap between the first sound absorbing member 72 and the first bracket 71, and the wind flow channel of the first muffler hole 711. Of course, in other embodiments, the first sound absorbing member 72 can also be fixed to the first bracket 71.

[0045] like Figures 4 to 6 As shown, in one embodiment, the aperture of the first muffler hole 711 is larger than the aperture of the side air inlet 121, and the aperture of the side air inlet 121 is larger than the aperture of the first micro-pore. By setting different apertures, the dislocation is further enhanced, and the sense of science and technology of the appearance is enhanced. The aperture of the first muffler hole 711 is 1.9-2.7mm, the aperture of the side air inlet 121 is 0.9-1.7mm, and the aperture of the first micro-pore is 0.4-0.8mm.

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

[0047] like Figures 4 to 6As shown, in one embodiment, the air inlet 12 includes a first air inlet area and a second air inlet area. The rear end of the housing 1 forms the first air inlet area, and the side wall of the housing 1 corresponds to the first bracket 71 to form 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 direct current, and the side air inlet reduces the direct impact of the airflow. The combination of the rear air inlet and the side air inlet has better air inlet performance and is conducive to ensuring a sufficient effective air inlet area in a small portable fan.

[0048] like Figure 4 , Figure 5 and Figure 8 As shown, in one embodiment, the second sound absorbing assembly 8 includes a second bracket 81 and a second sound absorbing member 82. The second bracket 81 is arranged on the front inner side of the housing 1, the second sound absorbing member 82 is arranged between the second bracket 81 and the housing 1, and the second bracket 81 is formed with a plurality of second sound absorbing holes 811.

[0049] like Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, in one embodiment, the guide member 6 is installed on the inner side of the front end of the housing 1 from front to back, and at least part of the guide member 6 is arranged on the front side of the second bracket 81, and at least part of the guide member 6 is arranged on the front side of the second bracket 81. A first guide surface 611 is provided on the radial inner side of the first outer ring portion 61, and at least part of the first guide surface 611 radially increases from back to front. A second guide surface 621 is provided on the radial outer side of the first inner ring portion 62, and at least part of the second guide surface 621 radially decreases from back to front, and the front end of the first guide surface 611 exceeds the front end of the second guide surface 621 forward. At least part of the inner side surface of the second bracket 81 radially decreases from back to front, and at least part of the first guide surface 611 radially increases from back to front, and the inner side surface of the second bracket 81 is smoothly connected to the first guide surface 611. Meanwhile, in this embodiment, the second flow guide surface 621 first radially increases from the back to the front and then radially decreases, and the radially increased portion of the second flow guide surface 621 corresponds to the radially decreased portion of the second bracket 81 from the back to the front; the radially decreased portion of the second flow guide surface 621 corresponds to the radially increased portion of the first flow guide surface 611. In other words, the second flow guide surface 621, the inner side surface of the second bracket 81, and the first flow guide surface 611 roughly form a flow channel that first decreases and then increases from the back to the front.

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

[0051] Of course, in other embodiments, the second guide surface 621 may also radially increase from the back to the front, or first radially increase from the back to the front and then remain unchanged in the rear radial direction, which is not limited to this example.

[0052] like Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, in one embodiment, the axial length of the first sound absorbing component 7 is greater than the axial length of the second sound absorbing component 8, and the axial length ratio of the first sound absorbing component 7 to the second sound absorbing component 8 is 2-4. The airflow velocity and pressure at the air inlet are usually higher than those at the air outlet, so a longer first sound absorbing component 7 is required to handle high-energy airflow. The longer first sound absorbing component 7 can reduce noise while reducing airflow resistance by reasonably designing the structure (such as a multi-layer staggered air inlet structure). The noise at the air outlet mainly comes from the mechanical vibration of the motor component 3 and the fan component 4 and the secondary disturbance of the airflow, so the design of the second sound absorbing component 8 at the air outlet focuses more on absorbing high-frequency noise. In this embodiment, the second sound absorbing member 82 in the second sound absorbing component 8 is sound absorbing cotton, which has a good noise absorption effect. Of course, in other embodiments, the second sound absorbing component 8 can be made of organic fiber material, inorganic fiber material, cotton, foam plastic, sponge, perforated plate, leather, rubber, plastic, metal and other materials. By designing the axial length of the second sound absorbing component 8 to be 1 / 4-1 / 2 of the axial length of the first sound absorbing component 7, the overall axial length of the air outlet member 100 can be reduced, thereby reducing the overall volume of the portable fan.

[0053] like Figures 3 to 5As shown, in one embodiment, a stopper 101 is provided in the housing 1. The stopper 101 is radially disposed between the cylinder 2 and the housing 1, and the first bracket 71 is installed forward from the rear side of the housing 1. The first bracket 71 resists the stopper 101, and the rear end of the stopper 101 exceeds or is flush with the rear end of the fan assembly 4. The stopper 101 fixes the cylinder 2 in the radial direction, and resists and limits the first bracket 71 in the axial direction, thereby forming the air inlet chamber 14 and the cylinder 2 area. The stopper 101 exceeds or is flush with the rear end of the fan assembly 4, so that the fan assembly 4 will not affect the fluid in the air inlet chamber 14 too much. The stopper 101 also resists the rear end of the cylinder 2, so that the cylinder 2 and the first bracket 71 will not be misplaced or shifted.

[0054] like Figures 4 to 6 As shown, in one embodiment, the inner diameter of the first bracket 71 is 25.5-29.8 mm, and the inner diameter of the second bracket 81 is 25.9-28.4 mm. The cylinder 2 includes 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 component 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 component 8 is 0.8-1.2. The inner diameter of the first sound absorbing component 7 is the inner diameter of the first bracket 71, and the inner diameter of the second sound absorbing component 8 is the inner diameter of the second bracket 81. In other words, the inner diameters of the first bracket 71, the second outer ring portion 21 and the second bracket 81 are substantially equal, or have little difference, so that the overall air duct is smoother. The inner diameters of the first bracket 71 , the second outer ring portion 21 and the second bracket 81 are all relatively small, so that the air outlet member 100 has a small overall volume and is convenient for users to carry.

[0055] like Fig. 9 As shown, in one embodiment, the cylinder 2 further includes a buffer 24, the buffer 24 is made of soft rubber, and the buffer 24 is fixed to the outside of the second outer ring portion 21, so that the cylinder 2 as a whole is better fixed in the stopper 101. Of course, in other embodiments, the buffer 24 may not be provided. Figure 4 , Figure 5 and Fig. 9As shown, it can be seen that the motor assembly 3 is an outer rotor motor, and the motor assembly 3 includes a stator assembly 31 and a rotor assembly 32, and the rotor assembly 32 includes a rotating shaft 321, a bearing 322, a magnetic ring 323 and a housing 324. The fan assembly 4 includes a hub 41 and a plurality of blades 42 arranged radially outside the hub at intervals. 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 radial inner side of the housing 324 and is arranged on the radial 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 operate synchronously. By providing the motor component 3 in the form of an outer rotor, the fan component 4 is directly driven to rotate, and the motor component 3 is provided by rationally utilizing space.

[0056] like Figure 4 and Fig.10 As shown, in one embodiment, the handheld part 200 is provided with a rechargeable battery 201, and the rechargeable battery 201 is powered to drive the motor assembly 3. The handheld part 200 is provided with a switch assembly 202, and the switch assembly 202 includes a stepless adjustment member 2021, a pressing member 2022 and an adjustment plate 2023, and the stepless adjustment member 2021 and the pressing member 2022 are both electrically connected to the adjustment plate 2023. It should be understood that the stepless adjustment member 2021 is also equipped with an encoder 2024, and the encoder 2024 is connected to the air volume adjustment circuit. When the stepless adjustment member 2021 rolls, the encoder 2024 outputs a digital signal, thereby realizing stepless adjustment of the air volume of the portable fan.

[0057] The handheld part 200 is provided with a main circuit board 203, and the main circuit board 203 is electrically connected to the rechargeable battery 201, the adjustment plate 2023, and one or more circuit boards in the air outlet member 100. In this embodiment, the air outlet member 100 is provided with two circuit boards, one is provided at the front end of the second inner ring portion 22, and the other is provided at the front end of the first inner ring portion 62. The circuit board provided 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 provided at the front end of the first inner ring portion 62 is used to display the air volume, power, gear position, etc. In front of this circuit board, there is also a display screen (not numbered) for displaying corresponding values ​​through light.

[0058] like Figures 4 to 6As shown, in one embodiment, the rear frame 91 is further provided with a light-transmitting portion 92, and the mounting portion 712 is provided with a light-emitting member 10, and the light-emitting member 10 emits light backward through the light-transmitting portion 92. Thus, the portable fan also has the function of lighting, enriching the function of the portable fan. The light-transmitting portion 92 is provided at the center of the rear frame 91, and the light-emitting member is also provided at the center of the mounting portion 712. The rear air inlet 122 is provided at the radial outer side of the light-transmitting portion 92 of the rear frame 91, and corresponds to the blades 42 of the fan assembly 4, so as to facilitate the formation of direct current blowing.

[0059] The above detailed description is only an explanation of the preferred embodiment of the present application, and does not limit the patent scope of the present application. Therefore, all equivalent technical changes made by using the description and illustrations of this creation are included in the patent scope of this creation.

Claims

1. A low-noise air outlet, characterized in that: include: The shell has an air inlet at the rear side and an air outlet at the front side, and a cylinder is arranged inside the shell; A motor assembly is fixedly accommodated in the cylinder; A fan assembly is fixed to the barrel and the motor assembly and is at least partially contained in the barrel; A sound absorbing component is housed in the housing; Wherein, the sound absorbing component is arranged between the cylinder and the air inlet, and / or the sound absorbing component is arranged between the cylinder and the air outlet.

2. The air outlet member according to claim 1, characterized in that: The sound absorbing component includes a first sound absorbing component and a second sound absorbing component, wherein the first sound absorbing component is arranged between the cylinder and the air inlet, and the second sound absorbing component is arranged between the cylinder and the air outlet.

3. The air outlet member according to claim 2, characterized in that: The first sound absorbing component includes a first bracket and a first sound absorbing member. The first bracket is arranged on the rear inner side of the shell. The first sound absorbing member is arranged between the first bracket and the shell in the radial direction. The first bracket is penetrated by a plurality of first sound-absorbing holes.

4. The air outlet member according to claim 3, characterized in that: A stopper is provided inside the outer shell, and the stopper is radially arranged between the cylinder and the outer shell. The first bracket is installed forward from the rear side of the outer shell, and the first bracket resists the stopper. The rear end of the stopper extends backward beyond or is flush with the rear end of the fan assembly. The inner diameter of the first bracket is 25.5-29.8mm.

5. The air outlet member according to claim 3, characterized in that: The air inlet includes a first air inlet area and a second air inlet area. The rear end of the shell forms the first air inlet area, and the side wall of the shell forms the second air inlet area corresponding to the first bracket.

6. The air outlet member according to claim 2, characterized in that: The second sound absorbing component includes a second bracket and a second sound absorbing member, the second bracket is arranged on the front inner side of the shell, the second sound absorbing member is arranged between the second bracket and the shell, and the second bracket is penetrated by a plurality of second sound-absorbing holes; the inner diameter of the second bracket is 25.9-28.4 mm.

7. The air outlet member according to claim 6, characterized in that: It also includes a guide member, which is installed on the inner side of the front end of the outer shell from front to rear, and at least part of the guide member is arranged on the front side of the second bracket. The guide member 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 arranged on the radial inner side of the outer shell.

8. The air outlet member according to claim 7, characterized in that: A first guide surface is provided on the radial inner side of the first outer ring portion, at least a portion of the inner side surface of the second bracket radially decreases from the back to the front, at least a portion of the first guide surface radially increases from the back to the front, and the inner side surface of the second bracket is smoothly connected to the first guide surface; a second guide surface is provided on the radial outer side of the first inner ring portion, and the second guide surface first radially increases from the back to the front and then radially decreases.

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

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

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