Air duct flow guide mechanism of handheld fan

Abstract

The utility model relates to a handheld fan air duct flow guide mechanism which comprises an air duct assembly composed of a front fan cover, an air guide cover and a rear fan cover, the front fan cover is used for installing a motor, an annular air outlet is formed in the front fan cover, and fan blades driven by the motor to rotate are installed on the rear side of the front fan cover. The wind scooper is connected with the rear end of the front wind scooper and arranged on the outer sides of the fan blades in a sleeving mode, and an air inlet in butt joint with the rear end of the wind scooper is formed in the rear wind scooper. The mechanism is favorable for improving the air inlet amount of the fan, so that the airflow in the fan is more concentrated, and the wind power of the fan is improved.

Description

Technical Field

[0001] The utility model relates to an air duct guide mechanism for a handheld fan. Background Art

[0002] Handheld fans are popular among the public because they are easy to carry. However, in order to facilitate molding, the inner side of the air duct of the existing handheld fans is usually a continuous plane, and the air inlet is usually small, resulting in limited air intake of the fan, which in turn limits the amount of air available for the fan blades to rotate and output, and ultimately affects the wind force of the fan. If the wind force of the fan is to be increased, the speed of the fan needs to be increased, which will increase the production cost on the one hand, and increase the power consumption of the fan on the other hand, and reduce the time that the handheld fan can be used per charge. In addition, the noise of existing handheld fans is generally loud, which affects the consumer experience. Utility Model Content

[0003] The utility model aims to provide a handheld fan wind channel guide mechanism, which helps to increase the air intake of the fan, makes the airflow in the fan more concentrated, and improves the wind force of the fan.

[0004] The technical solution of the utility model is: a handheld fan air duct guide mechanism, including a wind guide cover for being placed on the outside of a fan blade, the wind guide cover includes a front section with an inner diameter gradually decreasing from front to rear, and the rear end of the front section is connected to a trumpet-shaped air inlet port with an inner diameter gradually increasing and forming an integral body.

[0005] Furthermore, the front end of the air guide cover is connected to the front air cover, and an annular air outlet is arranged in the front air cover. The annular air outlet is provided with spokes at intervals along the circumferential direction, and the rear end of the spoke is provided with an inclined surface inclined in the same rotation direction.

[0006] Furthermore, a mounting seat is arranged inside the front wind shield, an outer wall of the mounting seat and an inner wall of the front wind shield form an annular air outlet, and the mounting seat is connected to the front wind shield via a spoke plate.

[0007] Furthermore, the mounting seat is in the shape of a frustum with a smaller rear end and a conical side wall, and a motor for driving the fan blades is arranged in the mounting seat, and the fan blades are arranged on the rear side of the mounting seat.

[0008] Furthermore, the fan blade comprises a frustum-shaped main body connected to the fan and having a smaller rear end, and the frustum-shaped main body is provided with a spiral fan blade.

[0009] Furthermore, a front convex positioning ring is provided at the front end of the wind guide cover, a front concave positioning groove matching with the front convex positioning ring is provided at the rear end of the front wind cover, a positioning card groove matching with the positioning plate on the front wind cover is provided on the front convex positioning ring, and an avoidance groove is also provided on the front convex positioning ring.

[0010] Furthermore, the rear end of the air guide cover is connected to a rear air cover, and the rear end of the rear air cover is provided with an air inlet which is connected to the rear end of the air guide cover and has a plurality of hollow parts, and the inner side surface of the rear end of the rear air cover is an arc surface.

[0011] Furthermore, a rear convex positioning ring is provided at the rear end of the air guide cover, and a rear concave positioning groove matching with the rear convex positioning ring is provided at the rear end of the rear air cover.

[0012] Furthermore, the wind guide cover, front wind cover and rear wind cover constitute an air duct assembly and are arranged on the upper part of the air cover shell. Both sides of the air duct assembly are laterally provided with rotating shafts that are rotatably connected to the fan shell. The circumferential surface of the rotating shaft is provided with soft material that cooperates with the fan shell to form rotation damping.

[0013] Furthermore, a convex shaft protruding outward is provided at the end of the rotating shaft, a radial convex portion is provided on the convex shaft, and a limiting convex portion for rotationally limiting the radial convex portion is provided on the fan housing.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. This mechanism helps to increase the air intake of the fan by providing an air guide cover in the air duct assembly, so that the airflow in the fan is more concentrated and the wind force of the fan is increased.

[0016] 2. The mechanism prevents the rotating gas from contacting the curved surface by configuring the air guide cover to consist of a front section with an inner diameter that gradually decreases from front to back and a trumpet-shaped port, and by configuring the inner side surface of the rear end of the rear air cover to be an arc-shaped surface, thereby reducing the noise caused by the rotating friction of the air during suction.

[0017] 3. This mechanism avoids the noise caused by the collision between the rotating air and the spoke plate by setting the inclined surface on the spoke plate in the same direction as the rotating air, further reducing the noise of the fan.

[0018] 4. This mechanism helps to adjust the air outlet direction of the fan according to needs by rotatably connecting the air duct assembly to the fan housing, and cooperates with the rotation limit mechanism between the air duct assembly and the fan housing to prevent the air duct assembly from rotating 360° around the fan housing and breaking the wires of the fan assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded schematic diagram of the air duct assembly of the utility model;

[0020] Figure 2 It is a cross-sectional schematic diagram of the cooperation between the air duct assembly and the fan housing of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the front wind shield of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the air guide cover of the utility model;

[0023] Figure 5 It is a cross-sectional view of the air guide cover of the utility model;

[0024] Figure 6 It is a cutaway perspective view of the rear air hood of the utility model;

[0025] Figure 7 This is a schematic diagram of the cooperation between the air duct assembly and the fan housing of the utility model;

[0026] In the figure: 10-front wind shield 11-annular air outlet 12-mounting seat 13-spoke plate 14-diverter groove 15-inclined surface 16-front concave positioning groove 17-connecting card groove 18-motor 19-positioning plate 20-wind guide shield 21-front section 22-trumpet-shaped air inlet port 23-front convex positioning ring 24-rear convex positioning ring 25-positioning card groove 26-avoidance groove 27-rib plate 28-air inlet area 30-rear wind shield 31-air inlet 32-rear concave positioning groove 33-hook 34-hollow portion 35-arc surface 40-fan blade 41-cone-shaped main body 42-spiral fan blade 50-fan shield shell 51-limiting convex portion 60-rotating shaft 61-soft material 62-convex shaft 63-radial convex portion. DETAILED DESCRIPTION

[0027] In order to make the above features and advantages of the present invention more understandable, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0028] refer to Figures 1 to 7

[0029] A handheld fan air duct guide mechanism includes an air guide cover 20 for being placed outside a fan blade 40, the air guide cover includes a front section 21 with a gradually decreasing inner diameter from front to rear, and a trumpet-shaped air inlet port 22 with a gradually increasing inner diameter is connected to the rear end of the front section to form an integral body. The trumpet-shaped port increases the air intake volume, and the front section with a gradually decreasing inner diameter can make the wind more concentrated and increase the wind force.

[0030] In this embodiment, the front end of the air guide cover is connected to the front wind cover 10, and an annular air outlet 11 is arranged in the front wind cover. The annular air outlet is provided with spoke plates 13 at intervals along the circumferential direction. The annular air outlet is divided into a plurality of diversion grooves 14 by the spoke plates. The rear end of the spoke plates is provided with an inclined surface 15 inclined in the same rotation direction, thereby reducing the resistance of gas rotation, allowing the airflow to be better output, and reducing noise.

[0031] In this embodiment, in order to better install the motor of the fan blade, a mounting seat 12 is provided in the front wind shield, the outer wall of the mounting seat and the inner wall of the front wind shield form an annular air outlet 11, and the periphery of the mounting seat is connected to the inner wall of the front wind shield through the spoke plate.

[0032] In this embodiment, the mounting seat is in the shape of a frustum with a smaller rear end and a conical side wall, so that the airflow introduced into the annular outlet of the front wind shield by the wind guide shield can be more concentrated and compressed, thereby ensuring the wind speed.

[0033] In this embodiment, a motor 18 for driving the fan blade is arranged in the mounting seat, and the fan blade is arranged at the rear side of the mounting seat. The fan blade is a high-speed fan blade, specifically including a frustum-shaped body 41 connected to the fan and having a smaller rear end, and a spiral fan blade 42 is arranged on the frustum-shaped body, so that the airflow in the formed air duct can be better output from the air outlet.

[0034] In this embodiment, in order to realize the connection and positioning of the wind guide cover and the front wind cover, the front end of the wind guide cover is provided with a forward convex positioning ring 23, the rear end of the front wind cover is provided with a front concave positioning groove 16 matched with the forward convex positioning ring, and the forward convex positioning ring is provided with a positioning card groove 25 matched with the positioning plate on the front wind cover, so as to realize the positioning of the wind guide cover. In order to avoid the connecting column on the front wind cover for connecting the rear wind cover, the forward convex positioning ring is also provided with an avoidance groove 26, so as to better complete the avoidance of the connecting column and complete the positioning of the front wind cover.

[0035] In this embodiment, the rear end of the air guide cover is connected to a rear air cover which is sleeved on the outside of the air guide cover, and the front end of the rear air cover is snap-connected with the rear end of the front air cover. Specifically, the front inner wall of the rear air cover is provided with hooks 33 at intervals along the circumferential direction, and the rear end periphery of the front air cover is provided with connecting grooves 17 which cooperate with the hooks, thereby realizing the connection between the rear air cover and the front air cover.

[0036] In this embodiment, the rear end of the rear air hood is provided with an air inlet 31 which is connected to the rear end of the wind guide hood and has a plurality of hollow portions 34. The inner side surface of the rear end of the rear air hood is an arc-shaped surface, which can prevent the rotating gas from contacting the arc surface, reduce the noise caused by the rotating friction of the air during suction, and thus effectively reduce the noise of the fan.

[0037] In this embodiment, the arc surface of the rear air cover cooperates with the trumpet-shaped port of the air guide cover to form an air inlet area 28. The air rotates forward in the air inlet area, contacts the high-speed blades in the front section of the air guide cover, and is thrown out along the trajectory of the spiral blades. The thrown air enters the diverter slot, and the inclined surface on the spoke plate is in the same direction as the rotating air, which can avoid the noise caused by the collision between the rotating air and the spoke plate.

[0038] In this embodiment, in order to better complete the connection and positioning of the rear wind hood and the front wind hood, a rear convex positioning ring 24 is provided at the rear end of the wind guide hood, and a rear concave positioning groove 32 matching the rear convex positioning ring is provided at the rear end of the rear wind hood.

[0039] In this embodiment, in order to facilitate the handheld fan to adjust the air outlet direction, the wind guide cover, the front wind cover and the rear wind cover form an air duct assembly and are arranged on the upper part of the air cover housing 50. The two sides of the air duct assembly are transversely provided with a rotating shaft 60 that is rotatably connected to the fan housing. The fan housing is provided with an axial hole that matches the rotating shaft. The circumferential surface of the rotating shaft is provided with a soft material 61 that cooperates with the fan housing to form a rotation damping, so that the air duct assembly can be positioned after rotation and maintained at a desired angle. The soft material can be a silicone ring or a rubber ring. The soft material can be sleeved on the rotating shaft and interference fit, and the outer ring is clamped or interference fit with the axial hole on the fan housing, so that the fan assembly has rotation damping when rotating.

[0040] In this embodiment, in order to prevent the fan assembly from rotating 360° around the fan housing and breaking the wire of the fan assembly, the end of the rotating shaft is provided with a convex shaft 62 protruding outward, the convex shaft is provided with a radial convex portion 63, and the fan housing is provided with a limiting convex portion 51 for limiting the rotation of the radial convex portion. When the radial convex portion rotates to abut against the limiting convex portion, the fan assembly can no longer rotate. The rotating shaft is a hollow shaft so that the wire of the motor can pass through.

[0041] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the fixed connection to each other can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0042] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0043] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0044] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A handheld fan air duct guide mechanism, characterized in that: It comprises an air guide cover for being sleeved on the outside of the fan blade, the air guide cover comprises a front section with an inner diameter gradually decreasing from front to back, and the rear end of the front section is connected with a trumpet-shaped air inlet port which is integrally formed and has an inner diameter gradually increasing.

2. The handheld fan air duct guide mechanism according to claim 1, characterized in that: The front end of the air guide cover is connected to the front air cover, and an annular air outlet is arranged in the front air cover. The annular air outlet is provided with spokes at intervals along the circumferential direction, and the rear end of the spoke is provided with an inclined surface inclined in the same rotation direction.

3. The handheld fan air duct guide mechanism according to claim 2, characterized in that: A mounting seat is arranged inside the front wind shield, an outer wall of the mounting seat and an inner wall of the front wind shield form an annular air outlet, and the mounting seat is connected to the front wind shield via a spoke plate.

4. The handheld fan air duct guide mechanism according to claim 3, characterized in that: The mounting seat is in the shape of a truncated cone with a smaller rear end and a conical side wall. A motor for driving the fan blades is arranged in the mounting seat, and the fan blades are arranged on the rear side of the mounting seat.

5. The handheld fan air duct guide mechanism according to claim 1, 2, 3 or 4, characterized in that: The fan blade comprises a frustum-shaped main body connected to the fan and having a smaller rear end, and a spiral fan blade is arranged on the frustum-shaped main body.

6. The handheld fan air duct guide mechanism according to claim 2, 3 or 4, characterized in that: The front end of the wind guide cover is provided with a forward convex positioning ring, the rear end of the front wind cover is provided with a front concave positioning groove matched with the forward convex positioning ring, the forward convex positioning ring is provided with a positioning slot matched with the positioning plate on the front wind cover, and the forward convex positioning ring is also provided with an avoidance groove.

7. The handheld fan air duct guide mechanism according to claim 1, 2, 3 or 4, characterized in that: The rear end of the air guide cover is connected with a rear air cover, and the rear end of the rear air cover is provided with an air inlet which is connected with the rear end of the air guide cover and has a plurality of hollow parts, and the inner side surface of the rear end of the rear air cover is an arc surface.

8. The handheld fan air duct guide mechanism according to claim 7, characterized in that: The rear end of the air guide cover is provided with a rear convex positioning ring, and the rear end of the rear air cover is provided with a rear concave positioning groove matched with the rear convex positioning ring.

9. The handheld fan air duct guide mechanism according to claim 1, characterized in that: The wind guide cover, front wind cover and rear wind cover constitute an air duct assembly and are arranged on the upper part of the air cover shell. Both sides of the air duct assembly are laterally provided with rotating shafts that are rotatably connected to the fan shell. The circumferential surface of the rotating shaft is provided with soft material that cooperates with the fan shell to form rotation damping.

10. The handheld fan air duct guide mechanism according to claim 9, characterized in that: The end of the rotating shaft is provided with a convex shaft protruding outward, the convex shaft is provided with a radial convex portion, and the fan housing is provided with a limiting convex portion for limiting the rotation of the radial convex portion.

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