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 equipped with air duct, the air duct includes fan blade section and air guide section in turn along air outlet direction;Fan blade, rotatably set in the fan blade section;Motor assembly, its output shaft is connected with the fan blade;Air guide vane group, including air guide vane, each air guide vane includes inclined section and straight section in turn along air outlet direction, the inclined section is tangent to airflow direction, the straight section extends along the axial direction of the air duct shell;Connecting frame, be equipped in the center of the air guide vane group, with each air guide vane fixed connection, the motor assembly is set in the connecting frame inside;Air collection cover, connect in the air outlet end of the air duct shell, and extend outward along axial direction, its inside is formed with the air collection cavity of aperture gradually reducing along air outlet direction. 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, which includes a fan blade section and a guide section in sequence along the air outlet direction.

[0007] The fan blades are rotatably disposed within the fan blade section;

[0008] A motor assembly, the output shaft of which is connected to the fan blades, for driving the fan blades to rotate;

[0009] The air guide blade assembly includes multiple air guide blades evenly spaced along the circumference within the air guide section. Each air guide blade includes an inclined section and a straight section in sequence along the air outlet direction. The windward end of the inclined section is tangent to the airflow direction, and the straight section extends along the axial direction of the air duct shell.

[0010] A connecting frame is located at the center of the air guide vane assembly and is fixedly connected to each air guide vane; the motor assembly is located inside the connecting frame.

[0011] The wind-gathering hood is connected to the air outlet end of the air duct housing 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.

[0012] The aforementioned guide vanes are equipped with inclined and straight sections. The tangential design at the windward end of the inclined section rectifyes the rotating airflow generated by the fan blades, transforming the disordered vortex into a consistent axial airflow, reducing eddies and energy loss. The straight section further guides and straightens the airflow, ensuring that 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 enabling the airflow to be ejected over a greater distance.

[0013] Preferably, the inclined section of the guide vane is an arc-shaped surface; the angle between the tangent of the arc-shaped surface and the axis of the air duct shell gradually decreases along the air outlet direction, and finally smoothly transitions tangentially to the straight section.

[0014] 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.

[0015] Preferably, the transition position between the inclined section and the straight section is located in the middle of the guide vane.

[0016] The transition point between the inclined and straight sections is positioned in the middle of the guide vanes, ensuring that the inclined section has sufficient length for guiding and rectifying the airflow, while the straight section has sufficient length for stabilizing and straightening the flow. Furthermore, the balanced ratio between the inclined and straight sections makes the center of gravity and force distribution of the entire guide vane more symmetrical and rational, helping to reduce vibration during operation.

[0017] Preferably, the aperture of the air guide section gradually increases along the air outlet direction.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Preferably, the axial length of the guide vane is greater than the axial thickness of the connecting frame, and the inclined section of the guide vane is located on the outer circumferential side of the sleeve with a gap between them.

[0022] By designing the length of the guide vanes to be greater than the thickness of the connecting frame, the sleeve overlaps with the inclined section in the radial direction when it rotates. This allows the airflow to enter the flow channel between the guide vanes more smoothly after it exits the fan blades, improving the aerodynamic efficiency of the fan and reducing noise.

[0023] Preferably, the axial distance between the guide vane and the impeller is 4mm-8mm.

[0024] The above configuration allows the guide vanes and impeller to be placed closer together, enabling the air to quickly enter the guide vanes for rectification.

[0025] 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.

[0026] 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.

[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 air inlet of the air-gathering chamber is circular and corresponds to the air outlet of the air duct shell. The air outlet section has a waist-shaped structure and extends along the axial direction, that is, the air outlet section is flat, which can better concentrate the airflow.

[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 guide vanes are equipped with inclined and straight sections. The tangential design of the inclined section can rectify the rotating airflow generated by the fan blades, transforming the disordered swirling flow into axial airflow with a consistent direction, reducing eddies and energy loss; the straight section further guides and straightens the airflow, ensuring that the airflow is delivered to the outlet direction in a more parallel and concentrated manner. The combination of these two aspects can reduce the diffusion effect of the airflow. At the same time, the airflow is concentrated by the wind-gathering shroud, whose aperture gradually narrows as the airflow passes through, resulting in increased airflow velocity and dynamic pressure, thereby 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 a schematic diagram of the air duct shell structure;

[0039] Figure 6 This is an exploded view of the fan assembly.

[0040] Figure 7 A schematic diagram of the air duct shell from another perspective;

[0041] Figure 8 This is a cross-sectional view of the air duct casing;

[0042] Figure 9 This is a top view of the air duct casing;

[0043] Figure 10 This is a cross-sectional view of the duct casing and fan blades.

[0044] Figure 11 This is a cross-sectional view of the air guide vanes;

[0045] Figure 12 This is a side view of the wind shroud.

[0046] Reference numerals: 1. Outer shell; 11. Elastic hook; 12. Limiting protrusion; 13. Circuit board; 14. Battery; 2. Duct housing; 21. Fan blade section; 22. Air guide section; 23. Second screw hole; 3. Fan blade; 31. Impeller; 32. Sleeve; 4. Air guide blade; 41. Straight section; 42. Inclined section; 421. Windward end of inclined section; 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

[0047] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0048] 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.

[0049] like Figures 3 to 11 As shown, the fan assembly consists of a duct housing 2 and a concentrator 6. The duct housing 2 has an axially continuous duct inside, which 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. A guide blade assembly and a connecting frame 5 are provided within the guide section. The guide blade assembly includes multiple guide blades 4 evenly spaced circumferentially within the guide section 22. Each guide blade 4 includes an inclined section 42 and a straight section 41 along the airflow direction. The windward end 421 of the inclined section is tangent to the airflow direction, and the straight section 41 extends axially along the duct housing 2. The connecting frame 5 is located at the center of the guide blade assembly and is fixedly connected to each guide blade 4. The guide blades 4, the connecting frame 5, and the duct housing 2 are integrally injection molded.

[0050] The inclined section 42 of the guide vane 4 is an arc-shaped surface; the angle between the tangent of this arc-shaped surface and the axis of the duct housing 2 gradually decreases along the air outlet direction, and finally smoothly transitions tangentially to the straight section 41. The transition position between the inclined section 42 and the straight section 41 is located in the middle of the guide vane 4.

[0051] The connecting frame 5 is circular, with a hollow interior forming a mounting cavity 51 for housing 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 an axially extending sleeve 32 and several impellers 31 mounted 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 D between the guide vane 4 and the impellers 31 is 4mm-8mm. The axial length of the guide vane 4 is greater than the axial thickness of the circular connecting frame 5. The inclined section 42 of the guide vane 4, near the sleeve 32, is located on the outer circumferential side of the sleeve 32, and a gap exists between them.

[0052] like Figure 9 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 12 As 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.

Claims

1. A fan assembly comprising: include: The air duct shell has an axially continuous air duct inside, which includes a fan blade section and a guide section in sequence along the air outlet direction. The fan blades are rotatably disposed within the fan blade section; A motor assembly, the output shaft of which is connected to the fan blades, for driving the fan blades to rotate; The air guide blade assembly includes multiple air guide blades evenly spaced along the circumference within the air guide section. Each air guide blade includes an inclined section and a straight section in sequence along the air outlet direction. The windward end of the inclined section is tangent to the airflow direction, and the straight section extends along the axial direction of the air duct shell. A connecting frame is located at the center of the air guide vane assembly and is fixedly connected to each air guide vane; the motor assembly is located inside the connecting frame. The wind-gathering hood is connected to the air outlet end of the air duct housing 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.

2. The fan assembly of claim 1, wherein: The inclined section of the guide vane is an arc-shaped surface; the angle between the tangent of the arc-shaped surface and the axis of the air duct shell gradually decreases along the air outlet direction, and finally smoothly transitions tangentially to the straight section.

3. The fan assembly of claim 1, wherein: The transition point between the inclined section and the straight section is located in the middle of the guide vane.

4. The fan assembly according to claim 1, characterized in that: The aperture of the air guide section gradually increases along the air outlet direction.

5. 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.

6. The fan assembly according to claim 5, characterized in that: The axial length of the guide vane is greater than the axial thickness of the connecting frame, and the inclined section of the guide vane is located on the outer circumferential side of the sleeve with a gap between them.

7. The fan assembly according to claim 5, characterized in that: The axial distance between the guide vanes and the impeller is 4mm-8mm.

8. The fan assembly according to claim 4, 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.

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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