Fan assembly and waist hanging fan

Abstract

The utility model belongs to fan technical field especially relates to a fan assembly and hang waist fan. A kind of fan assembly, comprising: air duct shell, its inside is formed with air duct;Fan blade, rotatably set in air duct;Wind collecting cover, connect in the air outlet end of the air duct shell, and extend along the axial direction to outside, its inside is formed with the wind collecting cavity of gradually reducing aperture along air outlet direction;Multiple first wind guide vanes, it is evenly spaced around arrangement at the air outlet of air duct, and first wind guide vane is inclined to set and the windward end of first wind guide vane is tangent to airflow direction;Multiple second wind guide vanes, it is evenly spaced around arrangement in the wind collecting cover, and second wind guide vane extends along axial direction;Connecting frame, be located in the center of multiple first wind guide vanes, with each first wind guide vane fixed connection, motor assembly is set in the inside of connecting frame, and the output shaft of motor assembly is connected with fan blade.The utility model has the advantages that airflow is guided, and air supply distance is increased.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, and in particular relates to a fan assembly and a waist-mounted fan. Background Technology

[0002] Currently, the most common and traditional fan structures on the market, such as floor fans and table fans, typically employ a flat front and rear grille design. Their basic structure includes: a rear grille to protect the user and prevent foreign objects from entering, a fan blade assembly, and a front grille that also serves a protective function. The front and rear grilles are usually made of dense wire or plastic grids and are secured in the center with quick-release locks or screws.

[0003] However, the aforementioned fans lack effective airflow guidance, resulting in severe airflow diffusion: because both the front and rear grilles are flat, open grid structures, they themselves do not possess any airflow guidance or air collection functions. The airflow generated by the rotating fan blades immediately collides with the grilles after leaving the impeller and diffuses rapidly in all directions. This causes the airflow to be unable to be concentrated, significantly shortening the air delivery distance. Utility Model Content

[0004] To address the shortcomings of existing technologies, a fan assembly is provided that can guide airflow and increase the air delivery distance.

[0005] This utility model is achieved by the following technical solution: a fan assembly, comprising:

[0006] The air duct shell has an axially continuous air duct inside.

[0007] The fan blades are rotatably disposed within the air duct;

[0008] The wind-gathering hood is connected to the air outlet end of the air duct shell and extends outward along the axial direction. Inside it, there is a wind-gathering cavity with an aperture that gradually decreases along the air outlet direction.

[0009] Multiple first guide vanes are evenly spaced around the air outlet of the air duct, and the first guide vanes are inclined and the windward end of the first guide vanes is tangent to the airflow direction.

[0010] Multiple second air guide blades are evenly spaced around the circumference inside the wind-gathering hood, and the second air guide blades extend in the axial direction.

[0011] A connecting frame is located at the center of multiple first air guide blades and is fixedly connected to each first air guide blade. A motor assembly is located inside the connecting frame, and the output shaft of the motor assembly is connected to the fan blades to drive the fan blades to rotate.

[0012] The first guide vane is tilted, and the second guide vane is axially extended. The tangential design of the first guide vane rectifyes the rotating airflow generated by the fan blades, transforming the disordered vortex into a consistent axial airflow, reducing eddies and energy loss. The second guide vane further guides and straightens the airflow, ensuring it is delivered to the outlet direction in a more parallel and concentrated manner. The combination of these two features reduces the airflow diffusion effect. Simultaneously, the airflow is concentrated by the gradually narrowing aperture of the concentrator, increasing the airflow velocity and dynamic pressure as it passes through, thus propelling the airflow to a greater distance.

[0013] Preferably, the inner ring formed by the sidewalls of the plurality of second guide vanes near the axis is coaxially arranged with the connecting frame, and the diameter of the inner ring is the same as the diameter of the connecting frame.

[0014] The airflow, after being rectified by the first guide vane, has an effective flow cross-section that is an annular region with the outer edge of the connecting frame as its inner diameter and the inner wall of the duct housing as its outer diameter. Setting the inner diameter of the windward end of the second guide vane to match the diameter of the connecting frame means that the inner boundary of the guide ring formed by the second guide vane perfectly coincides with the inner boundary of this annular airflow. This ensures that all airflow is guided "without omission" into the channel formed by the second guide vane for secondary straightening and acceleration. Furthermore, the second guide vane does not need to extend unnecessarily inward radially; it only needs to precisely cover the airflow cross-section, reducing material usage and lowering product weight and cost.

[0015] Preferably, the first guide vane is an arc-shaped curved surface, and the angle between the tangent of the arc-shaped curved surface and the axis of the air duct shell gradually decreases along the air outlet direction.

[0016] The above-described configuration allows for better gas flow guidance. The gradually decreasing angle between the tangent and the axis signifies a gradual change in airflow direction. This avoids eddies and flow separation caused by abrupt changes in flow direction, reduces turbulence and flow resistance, and minimizes kinetic energy loss during the rectification process.

[0017] Preferably, the second guide vane abuts against the first guide vane.

[0018] The above configuration ensures that the airflow immediately enters the second guide vane after leaving the first guide vane, thus preventing the airflow from diffusing, turbulent, and dissipating energy in an open cavity area after leaving the first guide vane and before entering the second guide vane.

[0019] Preferably, the air duct housing includes a fan blade section and a guide section in sequence along the air outlet direction. The fan blade is disposed in the fan blade section, the first guide blade is disposed in the guide section, and the aperture of the guide section gradually increases along the air outlet direction.

[0020] This design creates a gradually widening airflow channel in the air guide section, which reduces airflow velocity. Because the airflow from the rotating fan blades travels at high speeds, the high-speed airflow directly impacts the air guide blades and subsequent components, generating significant vortex noise. By initially slowing the airflow through the gradually widening channel, the airflow is effectively smoothed, wind noise is reduced, and the user experience is improved.

[0021] Preferably, the circumferential outer edge cross-section of the air duct shell is rectangular; the wall thickness of the air guide section of the air duct shell gradually decreases in its corner area along the air outlet direction, causing the flow channel aperture formed by the air guide section to gradually increase along the air outlet direction.

[0022] The outer edge of the duct shell is rectangular, and the wall thickness of the duct shell is larger at its corners. Therefore, by reducing the wall thickness at the thicker corners, the flow channel aperture formed by the air guide section gradually increases along the air outlet direction. This setting method can ensure the strength of the entire duct shell.

[0023] Preferably, the fan blade includes a sleeve extending in the axial direction and a plurality of impellers disposed on the sleeve. The sleeve is coaxially arranged with the connecting frame and connected to the output shaft of the motor assembly. The outer diameter of the sleeve is the same as the outer diameter of the connecting frame, and the axial distance between the sleeve and the connecting frame is 2mm-5mm.

[0024] The sleeve and the connecting frame have the same outer diameter and are coaxial, and the gap between them is 2mm-5mm. This means that when the fan blade rotates, an almost continuous cylindrical flow boundary is formed between the sleeve at its root and the stationary connecting frame, which can reduce aerodynamic noise and flow loss.

[0025] Preferably, the axial length of the first guide vane is greater than the axial thickness of the connecting frame, and the end of the first guide vane near the sleeve is located on the circumferential outer side of the sleeve with a gap between them; the axial distance between the first guide vane and the impeller is 4mm-8mm.

[0026] By designing the length of the first guide vane to be greater than the thickness of the connecting frame, the sleeve overlaps with the first guide vane radially during rotation. This allows the airflow to enter the flow channel between the first guide vanes more smoothly after exiting the fan blades, improving the fan's aerodynamic efficiency and reducing noise. This arrangement also brings the first guide vane and impeller closer together, allowing airflow to quickly enter the first guide vane for rectification.

[0027] Preferably, the wind-gathering hood includes a wind-gathering section and a wind-discharging section along the air outlet direction. The wind-gathering section is provided with the wind-gathering cavity and the air inlet end of the wind-gathering cavity is circular. The wind-discharging section has a waist-shaped structure and extends along the axial direction. The wind-gathering section and the wind-discharging section are smoothly connected.

[0028] The above design allows the blown air to be more concentrated.

[0029] A waist-mounted fan with the above-mentioned fan assembly includes a housing, the housing having a placement slot adapted to the fan housing, the fan assembly being disposed in the placement slot, and the housing having a circuit board for controlling the rotation of the fan and a battery for supplying power to the fan.

[0030] The placement slot is provided with a limiting protrusion at the air outlet end of the wind-gathering hood. The outer wall of the wind-gathering hood is provided with two spaced protrusions. The limiting protrusion is located between the two protrusions and contacts and cooperates with the two protrusions.

[0031] The outer wall of the casing is provided with elastic hooks for hanging on the user's waist.

[0032] The combination of the aforementioned protrusions and limiting protrusions can provide positioning for installers during installation and can also limit the end of the wind concentrator, reducing vibration when the wind concentrator is venting air.

[0033] Compared with existing technologies, the beneficial effects of this invention are as follows: The inclined arrangement of the first guide vane and the axial extension of the second guide vane allow for the rectification of the rotating airflow generated by the fan blades, transforming the disordered vortex into a consistent axial airflow, thus reducing eddies and energy loss. The second guide vane further guides and straightens the airflow, ensuring it is delivered to the outlet direction in a more parallel and concentrated manner. The combination of these two features reduces the airflow diffusion effect. Simultaneously, the concentrating effect of the wind-gathering shroud, with its gradually narrowing aperture, increases the airflow velocity and dynamic pressure as air passes through, enabling the airflow to be ejected to a greater distance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a waist-mounted fan;

[0035] Figure 2 A schematic diagram of the structure of the waist-mounted fan and the air-concentrating cover;

[0036] Figure 3 This is a schematic diagram of the internal structure of a waist-mounted fan;

[0037] Figure 4 This is a schematic diagram of the fan assembly.

[0038] Figure 5 This is an exploded view of the fan assembly.

[0039] Figure 6 A schematic diagram of the air duct shell from another perspective;

[0040] Figure 7 This is a cross-sectional view of the air duct casing;

[0041] Figure 8 This is a top view of the air duct casing;

[0042] Figure 9 This is a cross-sectional view of the duct casing and fan blades.

[0043] Figure 10 This is a cross-sectional view of the air guide vanes;

[0044] Figure 11 This is a cross-sectional view of the wind-concentrating shroud;

[0045] Figure 12 This is a rear view of the wind-concentrating shroud;

[0046] Figure 13 This is a cross-sectional view of the fan assembly.

[0047] Reference numerals: 1. Outer shell; 11. Elastic hook; 12. Limiting protrusion; 13. Circuit board; 14. Battery; 2. Air duct shell; 21. Fan blade section; 22. Air guide section; 23. Second screw hole; 3. Fan blade; 31. Impeller; 32. Sleeve; 41. First air guide blade; 411. Windward end of the first air guide blade; 42. Second air guide blade; 5. Connecting frame; 51. Mounting cavity; 52. Axial sleeve; 6. Concentrator cover; 61. Protrusion; 62. Fixing plate; 621. First screw hole; 63. Concentrator section; 64. Air outlet section. Detailed Implementation

[0048] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0049] like Figures 1 to 3 As shown, this embodiment discloses a fan assembly and a waist-mounted fan. The waist-mounted fan contains a fan assembly and includes a housing 1. The housing 1 has a placement slot (not shown) for holding the fan assembly, which is fitted into the shape of the fan assembly's air duct housing 2. The housing 1 also contains a circuit board 13 for controlling fan rotation and a battery 14 for supplying power to the fan assembly. The circuit board 13 can control the fan assembly using any existing fan control method. An elastic hook 11 for hanging on the user's waist is provided on the outer wall of the housing 1; this elastic hook 11 is a type of hook used in existing waist-mounted fans.

[0050] like Figures 3 to 10 as well as Figure 13As shown, the fan assembly consists of a duct housing 2 and a concentrator 6. An axially continuous duct is formed inside the duct housing 2, which sequentially includes a fan blade section 21 and a guide section 22 along the airflow direction. A fan blade 3 is rotatably mounted within the fan blade section 21. Multiple first guide blades 41 and a connecting frame 5 are provided within the guide section. The multiple first guide blades 41 are evenly spaced circumferentially within the guide section 22, with the first guide blades inclined and their windward ends 411 tangent to the airflow direction. The connecting frame 5 is located at the center of the multiple first guide blades 41 and is fixedly connected to each first guide blade 41. The multiple first guide blades 41, the connecting frame 5, and the duct housing 2 are integrally injection molded. The first guide blades 41 have an arc-shaped curved surface, and the angle between the tangent of this arc-shaped surface and the axis of the duct housing 2 gradually decreases along the airflow direction.

[0051] The connecting frame 5 is circular, with a hollow center forming a mounting cavity 51 for placing the motor assembly (not shown in the figure). The connecting frame 5 also includes an axial sleeve 52 extending axially and communicating with the mounting cavity 51. The axial sleeve 52 is used to rotatably fix the output shaft of the motor assembly (not shown in the figure). The fan blade 3 includes a sleeve 32 extending axially and several impellers 31 disposed on the sleeve. The sleeve 32 is coaxially arranged with the connecting frame 5 and connected to the output shaft of the motor assembly, allowing the fan blade 3 to rotate. The outer diameter of the sleeve 32 is the same as the outer diameter of the connecting frame 5, and the axial distance between the sleeve 32 and the connecting frame 5 is 2mm-5mm. The axial distance between the first guide vane 41 and the impellers 31 is D, which ranges from 4mm-8mm. The axial length of the first guide vane 41 is greater than the axial thickness of the circular connecting frame 5. The end of the first guide vane 41 near the sleeve 32 is located on the outer circumferential side of the sleeve 32, and there is a gap between them.

[0052] like Figure 8 As shown, the circumferential outer edge cross-section of the air duct shell 2 is square; the wall thickness of the air guide section 22 of the air duct shell 2 gradually decreases in its corner area along the air outlet direction, causing the flow channel aperture formed by the air guide section 22 to gradually increase along the air outlet direction.

[0053] The air inlet end of the air-concentrating shroud 6 is equipped with a fixing plate 62. The outer circumferential cross-sectional shape of the fixing plate 62 is also square, and its dimensions are the same as those of the air duct housing 2. A first screw hole 621 is provided at the corner of the fixing plate 62, and a second screw hole 23 corresponding to the first screw hole 621 is provided at the corner of the air duct housing 2. The air duct housing 2 and the air-concentrating shroud 6 are fixed together by screws passing through the first screw hole 621 and the second screw hole 23.

[0054] like Figure 2 and Figure 4 as well as Figure 11 and Figure 12As shown, the wind-gathering hood 6 includes a wind-gathering section 63 and a wind-discharging section 64 along the air outlet direction. The wind-gathering section 63 has a wind-gathering cavity with an aperture that gradually decreases along the air outlet direction, and the air inlet end of the wind-gathering cavity is circular. The wind-discharging section 64 has an oblong structure and extends along the axial direction. The aperture of the wind-discharging section 64 is the same everywhere along the axial direction. The wind-gathering section 63 and the wind-discharging section 64 are smoothly connected. The outer wall of the air outlet end of the wind-gathering hood 6 is provided with two spaced protrusions 61. The placement groove of the outer shell 1 is provided with a limiting protrusion 12 corresponding to the air outlet end of the wind-gathering hood 6. The limiting protrusion 12 is located between the two protrusions 61 and contacts and engages with the two protrusions 61.

[0055] Within the air-gathering section 63, multiple second guide vanes 42 are arranged at uniform intervals along the circumference. These second guide vanes 42 extend axially to guide the airflow into a straight line, which is then blown out axially. The inner ring R formed by the sidewalls of the multiple second guide vanes 42 near the axis is coaxially arranged with the connecting frame 5, and the diameter of the inner ring R is the same as the diameter of the connecting frame 5. Simultaneously, the second guide vanes 42 abut against the first guide vanes 41.

Claims

1. A fan assembly, characterized in that, include: The air duct shell has an axially continuous air duct inside. The fan blades are rotatably disposed within the air duct; The wind-gathering hood is connected to the air outlet end of the air duct shell and extends outward along the axial direction. Inside it, there is a wind-gathering cavity with an aperture that gradually decreases along the air outlet direction. Multiple first guide vanes are evenly spaced around the air outlet of the air duct, and the first guide vanes are inclined and the windward end of the first guide vanes is tangent to the airflow direction. Multiple second air guide blades are evenly spaced around the circumference inside the wind-gathering hood, and the second air guide blades extend in the axial direction. A connecting frame is located at the center of multiple first air guide blades and is fixedly connected to each first air guide blade. A motor assembly is located inside the connecting frame, and the output shaft of the motor assembly is connected to the fan blades to drive the fan blades to rotate.

2. The fan assembly according to claim 1, characterized in that: The inner ring formed by the sidewalls of multiple second guide vanes near the axis is coaxially arranged with the connecting frame, and the diameter of the inner ring is the same as the diameter of the connecting frame.

3. The fan assembly according to claim 1, characterized in that: The first guide vane is an arc-shaped curved surface, and the angle between the tangent of the arc-shaped curved surface and the axis of the air duct shell gradually decreases along the air outlet direction.

4. The fan assembly according to claim 2, characterized in that: The second guide vane abuts against the first guide vane.

5. The fan assembly according to claim 1, characterized in that: The air duct housing includes a fan blade section and a guide section in sequence along the air outlet direction. The fan blade is located in the fan blade section, and the first guide blade is located in the guide section. The aperture of the guide section gradually increases along the air outlet direction.

6. The fan assembly according to claim 5, characterized in that: The outer circumferential cross-sectional shape of the air duct shell is rectangular; the wall thickness of the air guide section of the air duct shell gradually decreases in its corner area along the air outlet direction, causing the flow channel aperture formed by the air guide section to gradually increase along the air outlet direction.

7. The fan assembly according to claim 1, characterized in that: The fan blade includes a sleeve extending in the axial direction and a plurality of impellers disposed on the sleeve. The sleeve is coaxially arranged with the connecting frame and connected to the output shaft of the motor assembly. The outer diameter of the sleeve is the same as the outer diameter of the connecting frame, and the axial distance between the sleeve and the connecting frame is 2mm-5mm.

8. The fan assembly according to claim 7, characterized in that: The axial length of the first guide vane is greater than the axial thickness of the connecting frame. The end of the first guide vane near the sleeve is located on the outer circumferential side of the sleeve and there is a gap between them. The axial distance between the first guide vane and the impeller is 4mm-8mm.

9. The fan assembly according to claim 1, characterized in that: The wind-gathering hood includes a wind-gathering section and a wind-discharging section along the air outlet direction. The wind-gathering section is provided with the wind-gathering cavity and the air inlet end of the wind-gathering cavity is circular. The wind-discharging section has a waist-shaped structure and extends along the axial direction. The wind-gathering section and the wind-discharging section are smoothly connected.

10. A waist-mounted fan having the fan assembly according to any one of claims 1 to 9, characterized in that: The device includes a housing, which has a slot adapted to the fan housing. The fan assembly is disposed in the slot. The housing also contains a circuit board for controlling the fan rotation and a battery for supplying power to the fan. The placement slot is provided with a limiting protrusion at the air outlet end of the wind-gathering hood. The outer wall of the wind-gathering hood is provided with two spaced protrusions. The limiting protrusion is located between the two protrusions and contacts and cooperates with the two protrusions. The outer wall of the casing is provided with elastic hooks for hanging on the user's waist.

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