A handheld high-speed fan

Abstract

This invention discloses a handheld high-speed fan, comprising a first column and a second column. A ducted motor is housed inside the first column, with fan blades at the bottom of the ducted motor. A battery is housed inside the second column, and the ducted motor is electrically connected to the battery. An air inlet is located at the connection point of the first and second columns, and an air outlet is located at the first end of the first column furthest from the second column. A guide plate is provided at the air outlet, with the upper part serving as a converging section and the lower part as an air collecting section. The guide plate and the air outlet form an air outlet channel. In this invention, the narrowing design of the air outlet and the guide plate results in a narrowing of the internal airflow channel from bottom to top, accelerating the airflow. The airflow then flows along the guide surface of the guide plate, and finally, the symmetrical airflows on both sides converge at the center of the convex surface, thus being ejected vertically. A high-pressure zone is formed at the center of the guide plate, increasing the wind pressure and creating a vortex jet effect. This reduces airflow loss and ensures effective airflow and speed.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and more specifically, to a handheld high-speed fan. Background Technology

[0002] A fan is a device used to generate airflow and cool down in hot weather. An electric fan is a device that uses electricity to produce airflow. When the fan inside is powered on, it rotates, converting mechanical energy into wind energy, thus creating a natural breeze for a cooling effect. To make it convenient for people to use anytime and anywhere, fans were miniaturized, leading to the development of handheld fans. Existing handheld fans are mainly divided into bladed fans and bladeless fans based on the visibility of the blades. Bladed fans have blades that are directly visible, while bladeless fans have blades hidden inside the body and are not directly visible.

[0003] However, existing handheld fans still have some shortcomings:

[0004] 1. Traditional handheld fans suffer from dispersed and unfocused airflow because their open-blade design causes some airflow to flow to the sides, resulting in significant airflow loss and a very short air delivery distance, typically not exceeding 50 centimeters.

[0005] 2. Traditional handheld fans have exposed blades, which makes them susceptible to damage from external objects (dust, hair, stones, and other hard objects), and can also cause injury to fingers and hair (especially to children).

[0006] The above shortcomings need to be improved. Summary of the Invention

[0007] In order to overcome the problems of large air volume loss, short air delivery distance and easy damage or injury of existing handheld fans, the present invention provides a high-speed handheld fan.

[0008] The technical solution of this invention is as follows:

[0009] A handheld high-speed fan includes a first column and a second column. A ducted motor is housed inside the first column, and fan blades are located at the bottom of the ducted motor. A battery is housed inside the second column, and the ducted motor is electrically connected to the battery. An air inlet is located at the connection point between the first and second columns. An air outlet is located at the first end of the first column furthest from the second column. The air outlet is equipped with a guide plate with an elliptical cross-section. The guide plate is divided into upper and lower parts along the horizontal plane containing the major axis of the ellipse. The upper part is a converging section, and the lower part is an air collecting section. An air outlet channel is formed between the guide plate and the air outlet, and the air outlet channel is connected to the duct of the ducted motor. The air outlet has a tapering section, and the width of the air outlet channel gradually narrows from the air inlet to the air outlet, guiding it towards the converging section.

[0010] The rotation angle between the first column and the second column is 0-70°.

[0011] The second end of the first column is provided with a ball head, and the first end of the second column is provided with a ball seat, wherein the ball head engages with the ball seat.

[0012] The rotating mechanism includes a slide rail and a slider. The slide rail is formed on the ball seat, and the slider is connected to the ball head. The slider is slidably engaged with the slide rail.

[0013] The ball seat has multiple continuous positioning grooves on both sides of the slide rail, and the ball head is provided with a spring plunger that engages with the positioning groove. The positioning groove is shaped like a ball pit, and the ball on the spring plunger engages with the positioning groove.

[0014] A limiting block is provided below the slider. The limiting block contacts the inner wall of the second column when the first column and the second column are not bent or reach the maximum bending angle.

[0015] The slider has a wiring hole.

[0016] The air inlet includes a first air inlet duct, a second air inlet duct, and a third air inlet duct. The first air inlet duct is formed by hollowing out the outer side of the second end of the first column, the second air inlet duct is formed by hollowing out the ball head, and the third air inlet duct is formed by hollowing out the outer side of the first end of the second column and the ball seat.

[0017] The first and third air inlets are through-type air inlets.

[0018] The first column is equipped with a first dustproof net at the first air inlet and the second air inlet.

[0019] The second column is equipped with a second dustproof net at the third air inlet.

[0020] The second column is equipped with a touch panel, which is electrically connected to the ducted motor and the battery.

[0021] The first end of the first column is detachably connected to a nozzle.

[0022] The first column is provided with a first magnet, and the nozzle is provided with a second magnet. The opposite magnetic poles of the first magnet and the second magnet are opposite to each other, and the first column and the nozzle are magnetically connected. The first end of the first column is provided with a groove, and the bottom of the nozzle is provided with a protrusion, which engages with the groove.

[0023] The first column is threaded or snap-fitted to the nozzle.

[0024] The first column engages with the nozzle either by direct insertion or rotation.

[0025] A sealing ring is provided at the engagement point between the first column and the nozzle.

[0026] The air nozzles include an air diffuser, an air concentrator, and a flat air nozzle.

[0027] An air inlet is provided on the outside of the air-gathering nozzle and the air-flat nozzle.

[0028] In a preferred embodiment, the first column includes a first housing and a second housing. The first housing is provided with a buckle, and the second housing is provided with a slot. The slot engages with the buckle, and the first housing and the second housing are engaged and connected.

[0029] According to the above-described solution, the beneficial effects of this invention are as follows:

[0030] 1. In this invention, the air outlet is equipped with a tapering and a guide plate, which makes the internal air duct narrow from bottom to top. This accelerates the airflow and changes its direction of movement. The airflow then flows along the guide surface of the guide plate, and finally the symmetrical airflows on both sides converge at the center of the convex surface, thus being ejected vertically. A high-pressure zone is formed at the center of the guide plate, thereby increasing the wind pressure and creating a vortex jet effect. This makes the airflow more concentrated, minimizes airflow loss, and ensures the effectiveness of air volume and wind speed.

[0031] 2. This invention utilizes a brushless ducted motor, and through the design of the internal air duct and guide plate, the air speed and air volume are increased (due to the brushless ducted motor), while the airflow is more concentrated (due to the air duct and guide plate), thereby significantly increasing the air delivery distance. The measured air delivery distance can exceed meters.

[0032] 3. The air outlet in this invention is designed to be hidden. No air duct or vent is visible on the front of the air outlet. The air duct is hidden inside the product. Traditional handheld fans have exposed blades, which are easily damaged by external objects (dust, hair, stones, and other hard objects) and can easily cause injury to fingers and hair (especially to children). The hidden air duct design effectively avoids these problems, making it difficult for dust to enter. The design of not being able to see the air outlet on the front also improves the visual effect and makes it more aesthetically pleasing. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the present invention when it is not bent;

[0035] Figure 2 This is a front view of the structure of the present invention when it is bent;

[0036] Figure 3 This is a cross-sectional view of the structure of the present invention when bent;

[0037] Figure 4 This is a schematic diagram of the rotating mechanism in this invention;

[0038] Figure 5 This is a bottom view of the structure of the present invention when it is bent;

[0039] Figure 6 This is a schematic diagram of the structure of the air diffuser nozzle in this invention;

[0040] Figure 7 This is a schematic diagram of the structure of the flat air nozzle in this invention;

[0041] Figure 8 This is a schematic diagram of the nozzle structure from below in this invention;

[0042] Figure 9 This is a schematic diagram of the air-concentrating nozzle in this invention;

[0043] Figure 10 This is a cross-sectional view of the nozzle structure of the present invention;

[0044] Figure 11 This is a partial structural diagram of the slider in this invention;

[0045] Figure 12 for Figure 3 Enlarged view of the structure at point A in the middle;

[0046] Figure 13 This is a schematic diagram of the internal airflow in this invention.

[0047] In the figure, the following reference numerals are used: 1. First column; 101. Air outlet; 102. Air inlet; 1021. First air inlet duct; 1022. Second air inlet duct; 1023. Third air inlet duct; 103. Ball head; 104. Groove; 105. First housing; 1051. Buckle; 106. Second housing; 1061. Slot; 2. Second column; 201. Ball seat; 3. Rotating mechanism; 301. Slide rail; 302. Slider; 3021. Limiting position. 3022, wiring hole; 303, positioning groove; 304, spring plunger; 4, ducted motor; 5, fan blade; 6, battery; 7, guide plate; 71, confluence section; 72, air collection section; 8, first dustproof net; 9, second dustproof net; 10, touch panel; 11, nozzle; 1101, protrusion; 1102, air diffuser nozzle; 1103, air concentrator nozzle; 1104, air leveling nozzle; 1105, air inlet; 12, first magnet; 13, second magnet. Detailed Implementation

[0048] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0049] It should be noted that when a component is referred to as "fixed," "set," or "connected" to another component, it may be located directly or indirectly on that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first," "second," etc., are used for ease of description only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "Many" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0050] like Figures 1 to 5 , Figure 11 and Figure 13As shown, the handheld high-speed fan of the present invention includes a first column 1 and a second column 2. A ducted motor 4 is disposed inside the first column 1, and a fan blade 5 is disposed at the bottom of the ducted motor 4. A battery 6 is disposed inside the second column 2. The ducted motor 4 and the battery 6 are electrically connected. An air inlet 102 is disposed at the connection between the first column 1 and the second column 2. An air outlet 101 is disposed at the first end of the first column 1 away from the second column 2. A guide plate 7 is disposed at the air outlet 101. The cross-section of the guide plate 7 is elliptical. The guide plate 7 is divided into upper and lower parts along the horizontal plane of the major axis of the ellipse. The upper part is a converging part 71, and the lower part is an air collecting part 72. An air outlet channel is formed between the guide plate 7 and the air outlet 101. The air outlet channel is connected to the duct of the ducted motor 4. The air outlet 101 is provided with a narrowing opening. The width of the air outlet channel gradually narrows from the air inlet 102 to the air outlet 101 and guides the converging part.

[0051] With the air outlet 101 obstructed by the air guide plate 7, the air outlet channel is hidden between the air guide plate 7 and the air outlet 101. No air duct or vent is visible from the front of the air outlet 101; the air duct is concealed inside the product. Traditional handheld fans have exposed blades, which are easily damaged by external objects (dust, hair, stones, etc.) and can easily injure (especially children's) fingers and hair. The concealed air duct design effectively avoids these problems, preventing dust from entering. The design also improves the visual appeal of the product by concealing the air outlet 101 from the front. Traditional handheld fans suffer from scattered and unfocused airflow because the open blade design causes some airflow to flow to the sides, resulting in significant airflow loss. Concealing the blades 6 internally addresses this issue. Furthermore, the Coanda effect (also known as the wall adhesion effect) applies, where fluids (water or air) tend to deviate from their original flow direction and flow along the surface of a protruding object. When there is surface friction between a fluid and the surface of an object it flows over (also known as fluid viscosity), the fluid will flow along the surface of the object as long as the curvature is not too large. For example... Figure 13 The direction indicated by the middle arrow is the airflow direction. Under the drive of the ducted motor 4, the gas is squeezed upward through the air passage inside the product. Because the air outlet 101 is designed with a narrowing opening, the internal air passage narrows from bottom to top, which accelerates the airflow and changes the direction of the airflow. Then the airflow flows along the guide surface of the guide plate 7. Finally, the symmetrical airflows on both sides converge at the center of the convex surface and are then ejected in a vertical direction, forming a high-pressure zone at the center of the guide plate 7, thereby increasing the wind pressure and forming a vortex jet effect, making the airflow more concentrated, minimizing airflow loss, and ensuring the effect of air volume and wind speed.

[0052] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in a preferred embodiment, the air inlet 102 includes a first air inlet duct 1021, a second air inlet duct 1022, and a third air inlet duct 1023. The first air inlet duct 1021 is formed by hollowing out the outer side of the second end of the first column 1, the second air inlet duct 1022 is formed by hollowing out the ball head 103, and the third air inlet duct 1023 is formed by hollowing out the outer side of the first end of the second column 2 and the ball seat 201. The first air inlet duct 1021 and the third air inlet duct 1023 are through-type air ducts. By setting multiple air inlets, and the first air inlet duct 1021 and the third air inlet duct 1023 being through-type air ducts, a larger air intake cross-sectional area can be obtained without increasing the product volume; and hollowing out the ball head 103 to form the second air inlet duct 1022 does not weaken the air intake effect of the first column 1 after rotation.

[0053] like Figure 3 and Figure 12 As shown, in a preferred embodiment, a first dust filter 8 is provided inside the first column 1 at the first air inlet duct 1021 and the second air inlet duct 1022. A second dust filter 9 is provided inside the second column 2 at the third air inlet duct 1023. When airflow enters the fan, it is filtered by the first dust filter 8 and the second dust filter 9, reducing the amount of dirt entering the fan and minimizing the impact of dust on the rotation of the fan blades 5 and the ducted motor 4, thus ensuring efficient fan operation. It also prevents larger particles from being accelerated by the fan and blown towards objects, causing damage.

[0054] like Figure 3 As shown, in a preferred embodiment, the ducted motor 4 is a brushless ducted motor, and the fan blades 5 are integrated into the bottom of the ducted motor 4. At the same power, the ducted motor 4 has a significantly higher airflow efficiency than traditional handheld fans. While a typical 5-watt fan only reaches a few thousand revolutions per minute, the ducted motor 4 can reach tens of thousands of revolutions per minute. Compared to handheld fans on the market, it is much more energy-efficient at the same wind speed and airflow. With a 5000mAh battery 6, the maximum runtime can reach 3.7 hours (5W) to 7.4 hours (2.5W). The introduction of the ducted motor 4 allows the fan blades 5 to be concealed inside the casing, preventing them from being touched by fingers or external forces, significantly improving product safety and durability. Traditional handheld fans have a very short air delivery distance, generally not exceeding 50 centimeters. This is due to two main limitations: the efficiency of brushed motors and the lack of a good airflow design (usually, the fan blades are exposed with almost no airflow). However, this application utilizes a brushless ducted motor, and through the design of the internal airflow duct and guide plate 7, the air speed and volume are increased (due to the brushless ducted motor), while the airflow is more concentrated (due to the airflow duct and guide plate 7), thus significantly increasing the air delivery distance. In actual tests, the air delivery distance can exceed 5 meters.

[0055] like Figure 1 and Figure 2 As shown, in a preferred embodiment, the second end of the first column 1 and the first end of the second column 2 are provided with a rotating mechanism 3 connecting the two, and the first column 1 and the second column 2 are rotatably connected by the rotating mechanism 3.

[0056] In its initial state, the center lines of the first column 1 and the second column 2 are collinear, making the fan as a whole cylindrical shape with no obvious protrusion 1101 in the direction perpendicular to the center line. The shape is relatively regular, making it easy to store and carry. In one example, the fan occupies a space with a diameter of 35mm and a length of 160mm, which is small in size, further facilitating storage and carrying.

[0057] In use, the user bends the first column 1 and the second column 2 according to the user's needs. The rotating mechanism 3 rotates under force, so that the first column 1 and the second column 2 rotate to a suitable angle. At this time, the center lines of the first column 1 and the second column 2 are at a certain angle. Then, the circuit between the battery 6 and the ducted motor 4 is connected, so that the battery 6 supplies power to the ducted motor 4. The ducted motor 4 starts and rotates, driving the fan blade 5 to rotate. The fan blade 5 rotates and draws in air from the air inlet 102. The airflow is accelerated by the fan blade 5 and blown out from the air outlet 101.

[0058] After use, disconnect the circuit between battery 6 and ducted motor 4, turn off ducted motor 4, stop the fan from rotating, and bend the first column 1 and the second column 2 in the opposite direction so that the first column 1 and the second column 2 return to their original positions. At this time, the center lines of the first column 1 and the second column 2 are collinear.

[0059] In practical applications of this invention, the first column 1 and the second column 2 can be approximately cylindrical or prismatic as a whole, and do not need to be regular cylindrical or prismatic. If chamfers or rounded corners are provided on the edges, or if some shapes are made at the ends or on the column surface, they should all be included in the scope of the column of this invention.

[0060] like Figure 3 As shown, in a preferred embodiment, the second end of the first column 1 is provided with a ball head 103, and the first end of the second column 2 is provided with a ball seat 201, with the ball head 103 engaging with the ball seat 201. When the first column 1 and the second column 2 rotate, the ball head 103 rotates within the ball seat 201, maintaining good contact between the first column 1 and the second column 2 at all times, and maintaining a large contact area to ensure the connection strength between the first column 1 and the second column 2.

[0061] like Figure 11 and Figure 12As shown, in a preferred embodiment, the rotating mechanism 3 includes a slide rail 301 and a slider 302. The slide rail 301 is formed on the ball seat 201, and the slider 302 is connected to the ball head 103. The slider 302 and the slide rail 301 are slidably engaged. The ball seat 201 has multiple continuous positioning grooves 303 on both sides of the slide rail 301. The ball head 103 is provided with a spring plunger 304 that engages with the positioning groove 303. The positioning groove 303 is shaped like a ball pit, and the ball on the spring plunger 304 engages with the positioning groove 303. A limit block 3021 is provided below the slider 302. The limit block 3021 contacts the inner wall of the second column 2 when the first column 1 and the second column 2 are not bent or reach the maximum bending angle.

[0062] In the initial state, the center lines of the first column 1 and the second column 2 are collinear. At this time, the slider 302 is engaged on both the inner and outer sides of the slide rail 301, ensuring a stable connection between the first column 1 and the second column 2. Simultaneously, without external force, the ball bearings of the spring plunger 304 engage in the positioning groove 303, positioning the slider 302 and the slide rail 301 to prevent relative displacement and thus keep the first column 1 and the second column 2 relatively stationary. Furthermore, the limiting block 3021 below the slider 302 abuts against the interior of the second column 2, limiting the rotation of the first column 1 and the second column 2 and preventing excessive rotation angle that could cause the slider 302 to derail from the slide rail 301, ensuring the reliability of the connection.

[0063] In use, the user bends the first column 1 and the second column 2 according to their needs. The slider 302 slides on the slide rail 301. Simultaneously, under the action of external force, the ball bearings of the spring plunger 304 disengage from the positioning groove 303. The ball bearings of the spring plunger 304 provide audible feedback as they slide within the positioning grooves 303. When the desired angle is reached, the ball bearings of the spring plunger 304 engage with the positioning groove 303, keeping the first column 1 and the second column 2 relatively fixed and maintaining their bent angle. This allows the user to adjust the bending angle according to their needs. When the first column 1 and the second column 2 reach their maximum bending angle, the other side of the limiting block 3021 abuts against the interior of the second column 2, restricting the rotation of the first column 1 and the second column 2, preventing the slider 302 from derailing, and ensuring reliable connection. The rotation angle between the first column 1 and the second column 2 is 0-70°.

[0064] After use, the reverse rotation resets the first column 1 and the second column 2, making their center lines collinear.

[0065] like Figure 12 As shown, in a preferred embodiment, the slider 302 has a wiring hole 3022. This facilitates wiring between the ducted motor 4 and the battery 6, and also protects the wiring from damage.

[0066] like Figure 1 and Figure 2 As shown, in a preferred embodiment, a touch panel 10 is provided on the second column 2, and the touch panel 10 is electrically connected to the ducted motor 4 and the battery 6. The large physical button is eliminated, and the touch panel 10 is used to adjust the fan speed, making it easier to use. This results in a smoother surface for the second column 2, improving its overall integrity. It also enhances dust and water resistance, protecting the internal components of the second column 2.

[0067] like Figure 3 , Figure 8 and Figure 10 As shown, in a preferred embodiment, a nozzle 11 is detachably connected to the first end of the first column 1. A first magnet 12 is provided on the first column 1, and a second magnet 13 is provided on the nozzle 11. The opposite magnetic poles of the first magnet 12 and the second magnet 13 face each other, and the first column 1 and the nozzle 11 are magnetically connected. A groove 104 is provided at the first end of the first column 1, and a protrusion 1101 is provided at the bottom of the nozzle 11, which engages with the groove 104.

[0068] This invention can be used directly or connected to the nozzle 11. When connecting the nozzle 11, the second magnet 13 on the nozzle 11 is brought close to the first magnet 12 on the first column 1. The opposite magnetic poles of the first magnet 12 and the second magnet 13 attract each other, thus magnetically connecting the first column 1 and the nozzle 11. At this time, the groove 104 engages with the protrusion 1101, positioning the first column 1 and the nozzle 11 so that they are aligned. For disassembly, simply overcome the magnetic force to remove the nozzle 11. The magnetic connection between the nozzle 11 and the first column 1 makes assembly and disassembly convenient.

[0069] In practical applications, the first column 1 is threaded or snap-fitted to the nozzle 11. The snap-fit ​​connection can be a straight-insertion snap-fit ​​or a rotary snap-fit, and a sealing ring can be provided at the snap-fit ​​point between the first column 1 and the nozzle 11 to improve the airtightness of the connection and ensure blowing efficiency.

[0070] like Figure 6 , Figure 7 and Figure 9As shown, in a preferred embodiment, the nozzle 11 includes a diffuser nozzle 1102, a concentrator nozzle 1103, and a flat nozzle 1104. The diffuser nozzle 1102 makes the blown air softer. The concentrator nozzle 1103 makes the airflow more focused and can be used for inflating (air mattresses, balloons, etc.), starting fires, etc. The flat nozzle 1104 blows the airflow horizontally, increasing the horizontal range of action and can be used to blow away dust and hair. An air inlet 1105 is provided on the outer side of the concentrator nozzle 1103 and the flat nozzle 1104. The airflow channel of the concentrator nozzle 1103 is smaller than the airflow at the outlet 101, and a baffle is provided inside the flat nozzle 1104. The baffle makes the airflow channel of the flat nozzle 1104 also smaller than the airflow at the outlet 101, thus increasing the airflow velocity in the concentrator nozzle 1103 and the flat nozzle 1104, which is then replenished with air through the air inlet 1105.

[0071] like Figure 3 , Figure 5 and Figure 12 As shown, in a preferred embodiment, the first column 1 includes a first housing 105 and a second housing 106. A buckle 1051 is provided on the first housing 105, and a slot 1061 is provided on the second housing 106. The slot 1061 engages with the buckle 1051, thus connecting the first housing 105 and the second housing 106. A slider 302 is connected to the first housing 105. By dividing the first main body into a first housing 105 and a second housing 106, it is convenient to install the ducted motor 4, fan blade 5, etc., into the first column 1 during installation. Furthermore, the first housing 105 and the second housing 106 are connected by the buckle 1051 and the slot 1061, resulting in a tight and reliable connection.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hand-held high speed fan, characterized by, It includes a first column and a second column. The first column is equipped with a ducted motor, and the bottom of the ducted motor is equipped with a fan blade. The second column is equipped with a battery. The ducted motor is electrically connected to the battery. The first column and the second column are equipped with an air inlet at the connection point. The first column is equipped with an air outlet at the first end away from the second column. The air outlet is equipped with a guide plate with an elliptical cross-section. The guide plate is divided into upper and lower parts along the horizontal plane containing the major axis of the ellipse. The upper part is a converging part, and the lower part is a collecting part. The guide plate and the air outlet form an air outlet channel, which is connected to the duct of the ducted motor. The air outlet is provided with a tapering opening, and the width of the air outlet channel gradually narrows from the air inlet end to the air outlet end, guiding the converging part. The air inlet includes a first air inlet duct, a second air inlet duct, and a third air inlet duct. The first air inlet duct is formed by hollowing out the outer side of the second end of the first column, the second air inlet duct is formed by hollowing out the bottom of the second end of the first column, and the third air inlet duct is formed by hollowing out the outer side and top of the first end of the second column. The second end of the first column and the first end of the second column are provided with a rotating mechanism connecting the two, and the first column and the second column are rotatably connected through the rotating mechanism; The second end of the first column is provided with a ball head, and the first end of the second column is provided with a ball seat. The ball head engages with the ball seat. The rotating mechanism includes a slide rail and a slider. The slide rail is opened on the ball seat. The slider is connected to the ball head. The slider and the slide rail are slidably engaged. The ball seat has multiple continuous positioning grooves on both sides of the slide rail, and the ball head is provided with a spring plunger that engages with the positioning groove. The positioning groove is shaped like a ball pit, and the ball on the spring plunger engages with the positioning groove.

2. A hand held high speed fan as claimed in claim 1 wherein, The first column is equipped with a first dustproof net at the first air inlet and the second air inlet.

3. A handheld high-speed fan according to claim 1, characterized in that, The second column is equipped with a second dustproof net at the third air inlet.

4. A handheld high-speed fan according to claim 1, characterized in that, The first end of the first column is detachably connected to a nozzle.

5. A handheld high-speed fan according to claim 4, characterized in that, The first column is provided with a first magnet, and the nozzle is provided with a second magnet. The opposite magnetic poles of the first magnet and the second magnet are opposite to each other, and the first column and the nozzle are magnetically connected.

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