Portable fan

Abstract

The utility model discloses a portable fan. The portable fan comprises a fan shell; the fan assembly is assembled in the fan shell in a suspended manner; an air inlet and an air outlet opposite to the air inlet are formed in the fan shell, an air inlet fence is arranged at the air inlet, and turbulent flow columns are arranged on the side, facing the fan assembly, of the air inlet fence. Due to the arrangement of the turbulent flow columns, turbulent flow which can be stably reserved at the positions originally loses the generated space environment, then the situation that by changing the direction and speed distribution of airflow, turbulence and rotation of the airflow in a narrow area are reduced is changed, air can be sucked into the fan more efficiently, and then the performance of the whole fan system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fans, in particular to a portable fan. BACKGROUND

[0002] In the hot summer, fans become essential for people to eliminate the heat. With the convenience of use, more and more people prefer light and portable fans.

[0003] In the prior art, a portable fan usually consists of a shell, a motor-driven fan assembly and an air inlet / outlet structure. Its working principle is to generate airflow by rotating the fan, and then guide the air into the air inlet and accelerate the air to the air outlet. However, the inventor of the present application found in research that when the fan assembly rotates at high speed, the airflow in front of the air inlet is prone to local turbulence, especially in the narrow area between the air inlet grille and the fan blades. This turbulence will disturb the laminar flow of the airflow, increase the air resistance, and reduce the amount of air sucked in per unit time. At the same time, the airflow turbulence caused by turbulence will cause vibration and vortex shedding noise, affecting the user experience. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a portable fan that reduces turbulence at the air inlet position and reduces wind noise.

[0005] The present application provides a portable fan, comprising:

[0006] a fan shell;

[0007] a fan assembly suspended and assembled in the fan shell;

[0008] an air inlet and an air outlet opposite to the air inlet are formed on the fan shell, an air inlet grille is arranged at the air inlet, and a turbulence column is arranged on the side of the air inlet grille facing the fan assembly.

[0009] Optionally, the fan assembly comprises a fan motor and fan blades, the fan motor is suspended and assembled in the fan shell, the fan blades are sleeved on the rotor of the fan motor, and the fan blades are rotationally connected with the fan shell through a rotating shaft.

[0010] Optionally, the fan blades comprise a hub and a plurality of moving blades, the plurality of moving blades are arranged at equal intervals around the hub, the hub is sequentially provided with a first end face and a second end face along the direction from the air inlet to the air outlet, and the diameter of the first end face is smaller than the diameter of the second end face.

[0011] Optionally, the outer diameter of the turbulence column is equal to the diameter of the first end face.

[0012] Optionally, the first end face is arc-shaped, and an outer diameter of the spoiler column is smaller than a diameter of the first end face.

[0013] Optionally, a linear distance between an end of the overhanging end of the spoiler column and the first end face is smaller than a diameter of the spoiler column.

[0014] Optionally, a receiving cavity is arranged in the spoiler column, and an opening of the receiving cavity is arranged at the end of the overhanging end of the spoiler column.

[0015] Optionally, the fan shell comprises an outer shell and a mounting seat, the mounting seat is detachably connected with the outer shell, a hollow pipe is arranged on the mounting seat, the fan motor is connected with the hollow pipe, and the fan assembly is arranged in a suspended manner.

[0016] Optionally, the fan motor comprises a stator, the stator is sleeved on the hollow pipe, a rotor is magnetically coupled with the stator, the fan blade is connected with the rotor, a PCB circuit board is arranged between the stator and the mounting seat, the PCB circuit board is sleeved on the hollow pipe, and the PCB circuit board is connected with the stator through a conductive leg.

[0017] Optionally, an air inlet gap is formed between the mounting seat and the fan blade, and at least part of the structure of the PCB circuit board is located in an annular space formed by the air inlet gap.

[0018] The beneficial effects of the embodiments of the present application are as follows: by arranging the spoiler column at the air inlet fence, the turbulent flow generated in the narrow area between the air inlet fence and the fan blade can be effectively interfered. Specifically, the arrangement of the spoiler column makes the turbulent flow that can be stably retained at this position lose the space environment for generation, thereby changing the direction and speed distribution of the airflow by changing the direction and speed distribution of the airflow, reducing the turbulence and rotation of the airflow in the narrow area, and enabling the air to be more efficiently sucked into the fan, thereby improving the performance of the entire fan system. By reducing the formation of turbulent flow, the spoiler column effectively reduces the degree of turbulence of the airflow, thereby reducing the friction and collision between the airflow and the fan blade, and thereby significantly reducing the wind noise. This not only improves the user experience, but also makes the fan run more quietly. At the same time, the spoiler column also has the effect of guiding the flow, and the airflow gap of the air inlet fence is guided to the central position of the fan blade by the wall attachment effect. In the traditional fan design, the rotational linear speed of the central position of the fan blade is relatively low, which results in a too small pressure difference between the central position and the external atmospheric pressure, thereby causing a relatively small air intake at the central position. The design of the spoiler column effectively solves this problem, and by guiding the airflow, the air intake at the central position is increased, so that the airflow distribution of the entire fan is more uniform, and the overall performance and efficiency of the fan are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 Fig. 1 is a first perspective view of a portable fan according to an embodiment of the present application;

[0021] Figure 2 Fig. 2 is a second perspective view of the portable fan according to the embodiment of the present application;

[0022] Figure 3 Fig. 3 is a cross-sectional view of the portable fan according to the embodiment of the present application.

[0023] BRIEF DESCRIPTION OF DRAWINGS: 1, fan housing; 11, air inlet; 12, air outlet; 13, air inlet grille; 131, turbulence column; 131a, receiving cavity; 131b, overhanging end; 14, mounting seat; 141, hollow tube; 2, fan assembly; 21, fan motor; 211, stator; 212, rotor; 22, fan blade; 221, hub; 221a, first end face; 221b, second end face; 222, moving blade; 23, rotating shaft; 3, PCB circuit board; 4, air inlet gap. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", and similar expressions used in the specification are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used in the specification are the same as those commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0026] Please refer to Figure 1 and Figure 2 , Figure 1 Fig. 1 is a first perspective view of a portable fan according to an embodiment of the present application; Figure 2 Fig. 2 is a second perspective view of the portable fan according to the embodiment of the present application;

[0027] AsFigure 1 and Figure 2 As shown in FIG. 1, a portable fan includes a fan housing 1, a fan assembly 2 suspendedly assembled in the fan housing 1, an air inlet 11 and an air outlet 12 oppositely arranged on the fan housing 1, and an air inlet grille 13 arranged at the air inlet 11 and provided with turbulence columns 131 facing the fan assembly 2.

[0028] The fan housing 1 in the embodiment is a cylindrical hollow housing, and the air inlet 11 and the air outlet 12 of the fan housing 1 are oppositely arranged. However, the shape of the fan housing 1 is not limited thereto, and according to different specific application scenarios, in some embodiments, the shape of the fan housing 1 can be (but is not limited to) an oval shape, a spherical shape, or a prismatic shape. In some embodiments, a handle is further assembled on the fan housing 1 for convenient holding. In some embodiments, the portable fan can serve as a separate module, and the fan housing 1 is provided with an expansion interface for connecting a corresponding expansion module.

[0029] In the embodiment, the material of the fan housing 1 is plastic, and the fan housing 1 made of plastic has the advantages of light weight, wear resistance, and corrosion resistance. However, the material of the fan housing 1 is not limited thereto, and according to different specific application scenarios, in some embodiments, the fan housing 1 can be made of metal materials, alloy materials, etc.

[0030] In the embodiment, the fan assembly 2 includes a fan motor 21 and fan blades 22. The fan motor 21 can be (but is not limited to) a single-phase motor, a two-phase motor, or a three-phase motor. The fan blades 22 can be axial flow blades or inclined flow blades.

[0031] The air inlet grille 13 in the embodiment is an arc-shaped grille. However, the structure of the air inlet grille 13 is not limited thereto, and according to different specific application scenarios, in some embodiments, the structure of the air inlet grille 13 can be a straight strip type grille or a grid type grille.

[0032] The shape of the turbulence column 131 in the embodiment is cylindrical. However, the shape of the turbulence column 131 is not limited thereto, and according to different specific application scenarios, in some embodiments, the shape of the turbulence column 131 can be a conical shape, a circular truncated cone shape, a polygonal shape, etc.

[0033] The above-mentioned embodiments can effectively interfere with the turbulent flow generated in the narrow area between the air inlet grille 13 and the fan blades by arranging the turbulence column 131 at the air inlet grille 13. Specifically, the arrangement of the turbulence column 131 makes the turbulent flow that can normally remain stable at this position lose the space environment for generation, thereby changing the direction and speed distribution of the airflow by changing the turbulence and rotation of the airflow in the narrow area, making the air more efficiently sucked into the fan, thereby improving the performance of the entire fan system. By reducing the formation of turbulent flow, the turbulence column 131 effectively reduces the degree of turbulence of the airflow, thereby reducing the friction and collision between the airflow and the fan blades, thereby significantly reducing the wind noise. This not only improves the user experience, but also makes the fan run more quietly. At the same time, the turbulence column 131 also has the effect of guiding the airflow, guiding the airflow in the gap of the air inlet grille 13 to the center position of the fan blades 22. In the traditional fan design, due to the low linear speed of the fan blades at the center position, the pressure difference between the center position and the outside atmosphere is too small, thereby making the air intake at the center position relatively small. The design of the turbulence column 131 effectively solves this problem by guiding the airflow, increasing the air intake at the center position, making the airflow distribution of the entire fan more uniform, and improving the overall performance and efficiency of the fan.

[0034] Please refer to Figure 3 , Figure 3 is a cross-sectional view of the portable fan of the present embodiment.

[0035] As shown in Figure 3 , in some embodiments, the fan assembly 2 includes a fan motor 21 suspendedly fitted in the fan housing 1 and a fan blade 22 sleeved on a rotor 212 of the fan motor 21, and the fan blade 22 is rotationally connected to the fan housing 1 through a rotating shaft 23.

[0036] The fan motor 21 includes a stator 211 connected with the fitting seat 14 and the rotor 212 sleeved on the stator 211 in a magnetic coupling manner. The fan blade 22 is sleeved on the rotor 212.

[0037] The rotor 212 is specifically a magnetic ring embedded in a hub 221 of the fan blade 22. In some embodiments, the rotor 212 is a plurality of strip-shaped magnets which are arranged in a ring shape around the inner peripheral wall of the hub 221.

[0038] The stator 211 includes an iron core and a plurality of coils wound on the iron core. The iron core is sleeved on the hollow tube 141.

[0039] The fan blade 22 is also connected to the fan housing 1 through a rotating shaft 23. Specifically, a shaft sleeve is arranged in the hollow tube 141, one end of the rotating shaft 23 is inserted into the hollow tube 141, and the other end is connected to the fan blade 22, and the rotating shaft 23 can rotate relative to the shaft sleeve.

[0040] The fan blade 22 is connected to the rotor 212 of the fan motor 21, which can effectively reduce the moment of the fan blade 22 when rotating, making the rotation of the fan blade 22 more sensitive. At the same time, the fan blade 22 is rotatably connected to the fan housing 1 through the rotating shaft 23. The rotating shaft 23 is a non-powered structure in this embodiment, but the presence of the rotating shaft 23 can ensure the stability of the connection of the fan blade 22 and make the rotating posture of the fan blade 22 more stable.

[0041] In some embodiments, the fan blade 22 includes a hub 221 and a plurality of moving blades 222 arranged at equal intervals around the hub 221. The hub 221 is sequentially provided with a first end face 221a and a second end face 221b along the direction from the air inlet 11 to the air outlet 12. The diameter of the first end face 221a is smaller than the diameter of the second end face 221b.

[0042] The first end face 221a is located at the air inlet end of the fan blade 22, and the second end face 221b is located at the air outlet end of the fan blade 22. The diameter of the first end face 221a is smaller than the diameter of the second end face 221b, i.e., the area of the first end face 221a is smaller than the area of the second end face 221b. A smaller air inlet end area can reduce the resistance of air entering the hub 221, making the air enter the fan blade 22 more smoothly. A larger blank space at the air inlet end makes the airflow more uniform before entering the fan blade, thereby improving the airflow efficiency of the entire fan. A smaller air inlet end area can reduce the turbulence of air entering the hub 221. Turbulence can cause energy loss and efficiency decline. By reducing turbulence, the overall efficiency of the fan can be improved. The diameter of the first end face 221a is smaller than the diameter of the second end face 221b, so that the hub 221 is in an increasing state in the space facing the second end face 221b. This structure reduces the space for airflow to flow and increases the airflow velocity, making the blowing effect of the portable fan better.

[0043] In this embodiment, the first end face 221a is a planar structure. However, the structure of the first end face 221a is not limited to this. According to different specific application scenarios, in some embodiments, when the hub 221 of the fan blade 22 is a conical structure, the first end face 221a is a hemispherical or arc-shaped structure. At this time, the diameter of the first end face 221a refers to the diameter of the hemispherical structure of the first end face 221a or the diameter of the largest cross-sectional circle of the arc-shaped structure.

[0044] In some embodiments, the outer diameter of the spoiler column 131 is equal to the diameter of the first end surface 221a. That is, the annular area of the spoiler column 131 is equal to the area of the first end surface 221a. Since the outer diameter of the spoiler column 131 is equal to the diameter of the first end surface 221a, the cross-sectional area of the flow channel remains constant after the air flow enters the air inlet grille 13, avoiding the phenomenon of local acceleration or deceleration caused by sudden changes in cross-sectional area. According to the Bernoulli equation and the continuity equation, uniform cross-sectional area can homogenize the air flow velocity, reduce energy loss caused by kinetic energy-pressure energy conversion, and improve overall air inlet efficiency. By uniform cross-sectional area, the air flow smoothly transitions on the surface of the spoiler column 131, reducing turbulent kinetic energy and reducing the risk of air flow separation, further reducing energy loss. The reduction of air flow energy loss directly reduces the aerodynamic noise caused by turbulent pulsation and vortex shedding. This design is more adaptable to changes in air flow velocity, and can maintain high efficiency at low speed (silent mode) and high speed (strong wind mode), widening the working condition use range of portable fans. This embodiment is applicable to any scenario where the first end surface 221a is a flat surface, a hemisphere, or a poor arc.

[0045] In some embodiments, when the first end surface 221a is a hemisphere or a poor arc, the outer diameter of the spoiler column 131 is less than the diameter of the first end surface 221a. In this embodiment, since the first end surface 221a itself is an arc-shaped structure, its cross-sectional area is gradually increasing along the flow direction of the air flow. At this time, the cross-sectional area of the spoiler column 131 is set to be smaller than the maximum cross-sectional area of the first end surface 221a, so that the cross-sectional area of the flow channel remains constant at least with one of the cross-sectional areas of the first end surface 221a, avoiding the phenomenon of local acceleration or deceleration caused by sudden changes in cross-sectional area. The arc-shaped first end surface 221a can further reduce the resistance when the air flow intersects the spoiler column 131 and the first end surface 221a, making the air flow velocity more stable. The reduction of air flow energy loss directly reduces the aerodynamic noise caused by turbulent pulsation and vortex shedding. This design is more adaptable to changes in air flow velocity, and can maintain high efficiency at low speed (silent mode) and high speed (strong wind mode), widening the working condition use range of portable fans.

[0046] In some embodiments, the end of the overhanging end 131b of the spoiler column 131 is linearly distanced from the first end surface 221a by a distance less than the diameter of the spoiler column 131. As is known, one condition for the formation of turbulence in a fluid is the presence of a velocity difference between the fluid. The space between the first end surface 221a and the spoiler column 131 is prone to the formation of a slow flow zone due to the obstruction of the first end surface 221a and the spoiler column 131, thereby generating turbulence. In order to reduce the scale and space of the turbulence, the end of the overhanging end 131b of the spoiler column 131 is linearly distanced from the first end surface 221a by a distance less than the diameter of the spoiler column 131. This "close end distance" structure inhibits the flow separation phenomenon in the conventional wake flow, reduces the flow dead zone, makes the fluid distribution more uniform, avoids excessive local temperature gradient, and improves the reliability of system thermal management. At the same time, due to the small end-to-end distance, the scale of the turbulence is inhibited, and the influence of the turbulence cannot spread to the surface of the spoiler column 131, further reducing energy loss and aerodynamic noise.

[0047] In some embodiments, the spoiler column 131 is provided with a receiving cavity 131a, and the opening of the receiving cavity 131a is arranged at the end of the overhanging end 131b of the spoiler column 131. The receiving cavity 131a with the opening at the overhanging end 131b forms an "inhale-exhale" effect when the fluid passes through, and multiple scale vortex systems are generated inside and outside the cavity. The vortex system inside the cavity can dissipate the energy consumption of the overall turbulence, reduce the energy in the external area of the turbulence, and weaken the turbulence energy that can interfere with the normal airflow flow in the external space, further reducing the energy loss and aerodynamic noise of the airflow.

[0048] In some embodiments, the fan housing 1 comprises an outer housing and an assembly seat 14, the assembly seat 14 is detachably connected with the outer housing, and the assembly seat 14 is provided with a hollow tube 141, and the fan motor 21 is connected with the hollow tube 141 to suspend the fan assembly 2.

[0049] The connection between the outer housing and the assembly seat 14 is a clamping connection. However, the connection between the outer housing and the assembly seat 14 is not limited to this, and according to different specific application scenarios, the connection between the outer housing and the assembly seat 14 can also be a screw connection or a magnetic attraction connection. The detachable connection between the outer housing and the assembly seat 14 can effectively improve the efficiency of separate manufacturing of the outer housing and the assembly seat 14, and also improve the assembly efficiency of the two.

[0050] In some embodiments, the fan motor 21 comprises a stator 211, the stator 211 is sleeved on the hollow tube 141, a rotor 212 is magnetically coupled to the stator 211, a fan blade 22 is connected to the rotor 212, a PCB circuit board 3 is arranged between the stator 211 and the assembly seat 14, the PCB circuit board 3 is sleeved on the hollow tube 141, and the PCB circuit board 3 is connected to the stator 211 through a conductive leg.

[0051] The stator 211 in the embodiment includes a core and a coil wound on the core. The core is provided with an opening at a middle position, so that the core can be sleeved on the hollow pipe 141 and connected to the hollow pipe 141 through a fastening fit.

[0052] In the embodiment, the rotor 212 is specifically a magnetic ring. The rotor 212 is connected to the stator 211 through magnetic coupling, the fan blade 22 is sleeved on the magnetic ring, and the magnetic ring rotates under the action of magnetic force after the stator 211 is energized, so that the fan blade 22 rotates synchronously with the magnetic ring.

[0053] The PCB circuit board 3 is arranged between the stator 211 and the assembly seat 14, and the PCB circuit board 3 is also provided with an opening at a middle position, so that the PCB circuit board 3 can be sleeved on the hollow pipe 141. Since the stress intensity of the PCB circuit board 3 itself is limited, the fastening connection stability between the PCB circuit board 3 and the hollow pipe 141 is weak. In order to enhance the connection stability of the PCB circuit board 3, the PCB circuit board 3 is connected to the stator 211 through a conductive leg. The conductive leg can not only conduct electrical signals, but also physically support the PCB circuit board 3, so that the connection of the PCB circuit board 3 is more stable.

[0054] In some embodiments, the assembly seat 14 and the fan blade 22 have an air inlet gap 4, and the PCB circuit board 3 is at least partially arranged in an annular space formed by the air inlet gap 4. The PCB circuit board 3 is partially embedded in the annular space formed by the air inlet gap 4, and the airflow generated by the fan directly flows through the surface of the PCB, so that the working heat of the PCB is quickly taken away by forced convection, thereby avoiding the performance degradation or failure of the circuit caused by local temperature rise. Meanwhile, the PCB circuit board 3 is nested on the hollow pipe 141 between the stator 211 and the assembly seat 14, and part of the PCB circuit board 3 extends into the air inlet gap 4. In this way, the heat dissipation of the fan itself airflow is maximized without occupying additional volume, which is particularly suitable for portable fan devices. The annular space design of the air inlet gap 4 uniformly distributes the airflow along the circumference of the PCB, avoids the local cooling dead angle caused by the traditional side air inlet, and improves the consistency of heat dissipation. The PCB is wrapped in the motor, and a positive pressure environment is formed by the airflow of the air inlet gap 4, which reduces the invasion of external dust or moisture and prolongs the service life of the circuit.

[0055] It should be noted that any one of the embodiments in the present embodiment can be independently implemented, or implemented in combination with one or more other embodiments. When combined, the combination manner should not be limited to the combination manner listed in the present embodiment.

[0056] It should be noted that the preferred embodiments of the present application are described in the specification and its attached drawings, but the present application can be implemented in many different forms and is not limited to the embodiments described in the specification, and these embodiments are not intended to be additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Furthermore, each of the above technical features continues to combine to form various embodiments not listed above, which are considered to be within the scope of the present application specification; further, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes shall fall within the scope of the claims of the present application.

Claims

1. A portable fan characterized by, Include: Fan housing; Fan assembly, the fan assembly is suspended in the fan housing; The fan housing is provided with an air inlet and an air outlet opposite to the air inlet, the air inlet is provided with an air inlet fence, and the air inlet fence is provided with a turbulence column on the side facing the fan assembly.

2. The portable fan of claim 1, wherein, The fan assembly includes: a fan motor and a fan blade, the fan motor is suspended in the fan housing, the fan blade is sleeved on the rotor of the fan motor, and the fan blade is rotationally connected with the fan housing through a rotating shaft.

3. The portable fan of claim 2, wherein, The fan blade includes: a hub and a plurality of moving blades, the plurality of moving blades are arranged at equal intervals around the hub, the hub is provided with a first end face and a second end face in sequence along the direction from the air inlet to the air outlet, and the diameter of the first end face is smaller than the diameter of the second end face.

4. The portable fan of claim 3, wherein, The outer diameter of the turbulence column is equal to the diameter of the first end face.

5. The portable fan of claim 3, wherein, The first end face is arc-shaped, and the outer diameter of the turbulence column is smaller than the diameter of the first end face.

6. The portable fan of claim 3, wherein, The end-to-end distance between the end of the overhanging end of the turbulence column and the first end face is less than the diameter of the turbulence column.

7. The portable fan of any one of claims 1-6, wherein, The turbulence column is provided with a receiving cavity, and the opening of the receiving cavity is arranged at the end of the overhanging end of the turbulence column.

8. The portable fan of claim 2, wherein, The fan housing includes: an outer housing and an assembly seat, the assembly seat is detachably connected with the outer housing, the assembly seat is provided with a hollow tube, the fan motor is connected with the hollow tube, so that the fan assembly is suspended.

9. The portable fan of claim 8, wherein, The fan motor includes: a stator, the stator is sleeved on the hollow tube, the rotor is magnetically coupled with the stator, the fan blade is connected with the rotor, the stator and the assembly seat are provided with a PCB circuit board, the PCB circuit board is sleeved on the hollow tube, and the PCB circuit board is connected with the stator through a conductive leg.

10. The portable fan of claim 9, wherein, The assembly seat and the fan blade have an air inlet gap, and the PCB circuit board is at least partially arranged in the annular space formed by the air inlet gap.

Images