Portable bladeless fan

Abstract

The invention provides a portable bladeless fan which is characterized in that a first air inlet part is arranged on the rear side, a first air outlet part is arranged on the front side, and the first air inlet part and the first air outlet part are communicated in a shell; the pressurizing piece is connected with the front side of the shell, the pressurizing piece is provided with a negative pressure channel, and the negative pressure channel guides air on the radial outer side of the shell to the radial inner side of the shell; the mixed flow fan is located in the shell and connected to the rear side of the pressurizing piece, and the mixed flow fan rotates around a rotating shaft to generate airflow; a pressurizing flow guide channel is formed between the mixed flow fan and the shell and between the pressurizing piece and the shell, air enters the pressurizing flow guide channel from the first air inlet part, pressurized mixed flow is formed in the pressurizing flow guide channel and then is exhausted from the first air outlet part, and meanwhile air on the radial outer side of the shell is driven to flow through the negative pressure channel and is guided out from the radial inner side of the shell. On the basis that it is ensured that the first air outlet part exhausts air with enough air volume and air pressure, the air volume and the air supply distance are further increased through air guiding of the negative pressure channel.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a portable bladeless fan with large air volume and high wind pressure. Background Art

[0002] Axial fans are common fans in daily life. The characteristic of axial fans is that the path of wind from air inlet to air outlet does not deviate radially, which is basically equivalent to straight in and straight out. The wind enters the axial fan axially from the air inlet end and then leaves axially from the air outlet end. This method has low wind resistance, so the air volume loss is small. In other words, by default, technical personnel in this field will use axial fan blades to manufacture axial fans if they want to ensure low air volume loss. Over time, this has formed a consensus, and then formed a technical prejudice that is difficult to change. Because of this, technical personnel in this field have not proposed any ideas to solve this technical problem. By default, using axial fans will not go wrong, and it requires less investment in research and development, low cost, and the fan products can be quickly sold to make profits in the capital market.

[0003] However, unlike other companies in the same field who pursue the business thinking of low R&D costs and rapid product launches to seize market profits, the inventors of this application have consistently delved into the field of fan technology, and have conducted in-depth investigations and understanding of fluid theory, the fan product market, and the user's pain points and user needs. After studying the industry, they found that, taking handheld fans or ordinary desktop fans as examples, although the existing axial flow fans have low wind resistance and small air volume loss, they have not taken into account another technical problem, that is, the wind pressure of axial flow fans is low and the air supply distance is short. In other words, although there is no air volume loss, there is no incremental supplement, and the air supply distance is difficult to guarantee. Therefore, the general use distance of ordinary portable fans is about 1-1.5 meters. If it is a little further away, you will not be able to experience the refreshing feeling of blowing air and cooling off. At the same time, because the fan blades of axial flow fans are visible, infants and young children can easily cut their fingers when using them, or if foreign objects such as toys and chopsticks are inserted into the fan blades, they can easily break or even fragments fly and cut the human body. The existing axial flow fans are completely unable to meet the user's safety needs.

[0004] Moreover, the inventors of this application have found that some portable fans use centrifugal fan blades to overcome the difficulty of low wind pressure. However, after the wind enters the centrifugal fan axially from the air inlet end, it leaves radially from the air outlet end. The wind direction changes greatly, the air volume loss is very serious, and the air outlet effect is difficult to meet user requirements.

[0005] In addition, although it is well known in the industry that Dyson has launched bladeless fans, in order to achieve the desired air volume, it uses ultra-high-speed fans, so its volume is generally 30*30*150CM3 (cubic centimeters), which takes up a very large area, is inconvenient to use and even inconvenient to carry. In addition, Dyson's fan products are generally priced at around RMB 3,000-8,000, which is very expensive for ordinary families or individuals, and can even be said to be luxury goods, so it has no use value for ordinary users.

[0006] Due to the existence of the above-mentioned technical problems and technical prejudices, the existing portable fans can no longer meet the users' usage needs. At the same time, with the improvement of living standards and the enrichment of fan application scenarios, people's requirements for portable fans that can be carried with them are also getting higher and higher. After in-depth research on the above-mentioned technical problems, technical prejudices, user needs, usage safety issues and market products, the inventors of this application have proposed a portable bladeless fan after several years of research and experiments, in order to design a structure with large air volume and high wind pressure on a small portable fan, so as to solve the above-mentioned many problems in this technical field. Summary of the Invention

[0007] In view of this, the present invention provides a portable bladeless fan, in which a negative pressure channel is arranged on the pressure member to guide the air from the radial outside of the shell to the radial inside of the shell. On the basis of exhausting wind with sufficient air volume and air pressure from the first air outlet, the air volume and air supply distance are further increased by guiding the air through the negative pressure channel.

[0008] The present invention provides a portable bladeless fan, comprising: a shell, a first air inlet portion being provided on the rear side, and a first air outlet portion being provided on the front side, the first air inlet portion and the first air outlet portion being connected in communication within the shell; a pressurizing member being connected to the front side of the shell, the pressurizing member having a negative pressure channel, the negative pressure channel guiding air from the radially outer side of the shell to the radially inner side of the shell; a mixed flow fan being located within the shell and connected to the rear side of the pressurizing member, the mixed flow fan rotating around a rotating shaft to generate an airflow; wherein a pressurized flow guide channel is formed between the mixed flow fan and the pressurizing member and the shell, air enters the pressurized flow guide channel from the first air inlet portion, forms a pressurized mixed flow in the pressurized flow guide channel, and is then discharged from the first air outlet portion, while simultaneously driving the air from the radially outer side of the shell to flow through the negative pressure channel and be guided out from the radially inner side of the shell, so as to ensure that the first air outlet discharges wind of sufficient volume and pressure, and further increase the air volume and air supply distance by guiding the air through the negative pressure channel.

[0009] Furthermore, the mixed flow fan includes a rotating seat that radially increases from the air inlet end to the air outlet end, and a plurality of blades connected and equidistantly arranged circumferentially of the rotating seat; the pressure member includes a pressure member that radially increases from the air inlet end to the air outlet end, and a plurality of connecting members connecting the outer circumference of the pressure member and the inner circumference of the shell, at least some of the connecting members are connected to the shell and are hollow to form the negative pressure channel; the pressurized guide channel is formed between the rotating seat and the pressure seat and the outer shell, and the axial length of the front and rear ends of the rotating seat is 1-1.5 times the axial length of the front and rear ends of the pressure seat.

[0010] Furthermore, it also includes a second air inlet and a second air outlet, the minimum radial cross-sectional area of ​​the pressurizing seat is larger than the maximum radial cross-sectional area of ​​the rotating seat, the second air inlet is located on the radial outside of the shell, the second air outlet is located on the radial inside of the pressurizing seat, and is located on the radial inside of the first air outlet, the negative pressure channel connects the second air inlet and the second air outlet, so as to discharge air in the radial direction where the first air outlet is located, and at the same time utilize the area on the radial inside of the pressurizing seat to discharge air, thereby realizing the reuse of the pressurizing function and the negative pressure air guiding function of the pressurizing seat.

[0011] Furthermore, the pressurized seat is provided with a cavity recessed backward at the air outlet end, the first air outlet portion is located radially outside the cavity, the area within the cavity forms a first high negative pressure zone, the second air inlet portion is located radially outside the shell, and the second air outlet portion is located radially inside the cavity, so as to ensure that the first air outlet portion discharges the pressurized mixed flow, and continuously supplement the first high negative pressure zone in the cavity through the negative pressure channel to reduce the airflow pulling and interference of the pressurized mixed flow, so as to stabilize the air outlet and increase the air volume and air supply distance.

[0012] Furthermore, the radial cross-section of the cavity is circular, and the cavity includes an end face located at the rear and a circumferential wall connected to the end face and located in the radial direction. In the axial direction, the end face is located behind the first air outlet portion, and the second air outlet portion is located radially inside the circumferential wall to shorten the length of the negative pressure channel.

[0013] Furthermore, it also includes an air-inducing member accommodated in the cavity, the air-inducing member includes a center portion and an edge portion, the edge portion bends and extends from the center portion in a direction away from the cavity, the center portion matches the end face, and there is a gap between the center portion and the end face, and the edge portion matches the peripheral wall to form a second high negative pressure area, the air-inducing member is provided with a vent, and the vent is connected to the second air outlet portion, and the air is continuously supplemented to the second high negative pressure area through the negative pressure channel, thereby reducing the air flow pulling and interference of the pressurized mixed flow, making the air outlet stable and increasing the air volume and air supply distance.

[0014] Furthermore, it also includes a second air inlet and a second air outlet, the second air inlet is located on the radial outside of the shell, the second air outlet is located on the radial inside of the pressurizing seat and the front side of the connecting piece, and is located radially inside the first air outlet and in the radial direction where the first air outlet is located. The negative pressure channel connects the second air inlet and the second air outlet to realize negative pressure wind guidance and circumferential air supply on the basis of guiding the pressurized mixed flow in the shell in the radial direction where the first air outlet is located.

[0015] Furthermore, the rotating seat includes an air guide surface that radially increases from the air inlet end to the air outlet end, and the pressure seat includes a pressure surface that radially increases from the air inlet end to the air outlet end. The air guide surface and the pressure surface are arranged in close proximity, and the axial spacing between the air guide surface and the pressure surface is 1-1.5mm to avoid turbulence between the rotating seat and the pressure seat, avoid noise generated by turbulent crosstalk, and thereby allow the wind formed by the mixed flow fan to flow smoothly to the pressure seat.

[0016] Furthermore, the rotating seat is provided with a accommodating portion recessed backward at the air outlet end, and the mixed flow fan uses an outer rotor brushless motor, which is accommodated in the rotating seat to achieve independent isolation of the rotating seat and the pressurizing seat; and / or the radius of the radial cross-section of the pressurizing seat at the air outlet end is 28-35mm, thereby expanding the blowing area while ensuring sufficient air volume and air pressure.

[0017] Furthermore, the portable bladeless fan is a handheld bladeless fan equipped with a handle, or a clamping fan equipped with a clip, or a versatile fan equipped with a curved shaping piece for winding, or a desktop fan equipped with a bracket, or a floor fan equipped with a telescopic bracket.

[0018] Compared with the prior art, the portable bladeless fan of the present invention has the following beneficial effects: by arranging a negative pressure channel on the pressure member, the air on the radial outside of the shell is guided to the radial inside of the shell, so that on the basis of the first air outlet discharging wind with sufficient air volume and wind pressure, the air on the radial outside of the shell is fully absorbed and utilized through the negative pressure channel, thereby further increasing the air volume and air supply distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view of the air inducing member of the portable bladeless fan of the present invention in a first state;

[0020] Figure 2 is a perspective view of the air inducing member of the portable bladeless fan of the present invention in the second state;

[0021] Figure 3 yes Figure 2 A three-dimensional exploded view of a portable bladeless fan from one angle;

[0022] Figure 4 yes Figure 2 Exploded three-dimensional diagram of the portable bladeless fan from another angle;

[0023] Figure 5 is a partial cross-sectional view of the portable bladeless fan of the present invention;

[0024] Figure 6 It is a schematic diagram of the rotating base and pressurizing base of the portable bladeless fan of the present invention;

[0025] Figure 7 This is a left side view of the portable bladeless fan of the present invention when the housing is transparently displayed;

[0026] Figure 8 is a front-to-back cross-sectional view of the portable bladeless fan of the present invention;

[0027] Figure 9 This is a partial rear view of the portable bladeless fan of the present invention with the cover hidden and the housing displayed transparently. DETAILED DESCRIPTION

[0028] To facilitate a better understanding of the purpose, structure, features, and effects of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

[0029] To facilitate understanding of the technical solutions of the present invention, the X-axis of the three-dimensional coordinate axes in the drawings of the specification is defined as the left-right direction, the Y-axis is defined as the front-back direction, and the Z-axis is defined as the up-down direction. In this application, air, wind, airflow, and fluid all refer to gases.

[0030] refer to Figures 1 to 4 , Figure 1 and Figure 2 is a perspective view of the portable bladeless fan 100 of the present invention, Figure 3 and Figure 4 1 and 2 are exploded views of the portable bladeless fan 100 of the present invention at two different angles.

[0031] refer to Figure 1 and Figure 2The portable bladeless fan 100 includes a retaining member 19 located on the outside of the housing 1. In this embodiment, the portable bladeless fan 100 is a handheld bladeless fan, and is provided with a handle (not shown, the same below) for the user to hold. The handle is the retaining member 19. Of course, the portable bladeless fan 100 can also be a clamping fan provided with a clip, or a versatile fan provided with a curved shaping member for winding, or a desktop fan provided with a bracket, or a floor fan provided with a telescopic bracket. Correspondingly, the retaining member 19 can be a clip, a curved shaping member, a bracket or a telescopic bracket, and is not limited to this. A semiconductor refrigeration element (not shown, the same below) can be provided on the handle, and the user can carry the portable bladeless fan 100 with him. At the same time, the semiconductor refrigeration element can automatically adjust the cooling temperature according to the temperature of the part in contact with the user, thereby improving the user's carrying comfort. It should be understood that the portable bladeless fan 100 is used for heat dissipation and cooling, and a semiconductor refrigeration component is provided on the corresponding handle to enhance the user's carrying comfort; of course, adding a heating element (not shown) to the portable bladeless fan 100 can also be used for heat preservation and heating, and a warming component (not shown) can be provided on the corresponding handle to automatically adjust the temperature of the part in contact with the human body to warm the part in contact with the human body and enhance the user's carrying comfort.

[0032] Combine Figure 3 and Figure 4 In this embodiment, the interior of the handle can accommodate a battery (not marked, the same below), and the handle can be exposed to set a switch button (not marked, the same below) and a charging port (not shown, the same below). The battery supplies power to the portable bladeless fan 100, the switch button is used to adjust the wind speed and switch, and the charging port is used to charge the battery with an external power supply. When the portable bladeless fan 100 is a fan of other forms (such as the above-mentioned clamping fan, versatile fan, desktop fan, etc.), the positions of the battery, switch button and charging port can be adjusted accordingly. Of course, in order to pursue a thinner and lighter appearance, the portable bladeless fan 100 may not be provided with the battery, and it can also be portable by setting an interface (not shown) to connect to an external mobile power supply.

[0033] refer to Figures 1 to 4The portable bladeless fan 100 includes a shell 1, a pressure member 3, a mixed flow fan 2 and an air inducing member 4. The radial cross-sections of the shell 1, the pressure member 3, the mixed flow fan 2 and the air inducing member 4 are generally circular. Of course, the shell 1, the pressure member 3, the mixed flow fan 2 and the air inducing member 4 can also be in other shapes, and are not limited to this. The pressure member 3 is connected to the front side of the shell 1, and the pressure member 3 and the shell 1 are integrally formed. Of course, the pressure member 3 and the shell 1 can also be separately formed, and the pressure member 3 is installed on the shell 1, and is not limited to this. The mixed flow fan 2 is connected to the rear side of the pressure member 3 and is located inside the shell 1. The mixed flow fan 2 rotates around the rotating shaft 24 to generate airflow. In this embodiment, the air induction member 4 is used to fix the portable bladeless fan 100 to an external object. Of course, the function of the air induction member 4 is not limited to this. The air induction member 4 can be detachably fixed to the front end of the pressure member 3. The fixing method between the air induction member 4 and the pressure member 3 can be snap-fit, adsorption, etc., which is not limited to this. When the portable bladeless fan 100 does not need to be fixed to an external object, the air induction member 4 is fixed to the front end of the pressure member 3, and the air induction member 4 can be carried with the portable bladeless fan 100; when the portable bladeless fan 100 needs to be fixed to an external object, the fixing member can be removed from the front end of the pressure member 3. This avoids the situation where the air induction member 4 is lost, and satisfies the user's normal and stable use in various usage scenarios. The air inlet end R of the portable bladeless fan 100 is located at the rear end, and the air outlet end F is located at the front end. The direction extending perpendicular to the rotating shaft 24 and passing through the rotating shaft 24 is the radial direction, and the direction parallel to the rotating shaft 24 is the axial direction.

[0034] refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 7The diameter of the maximum radial cross-section of the shell 1 is 2-2.2 times the length of the front and rear ends of the shell 1, so that the portable bladeless fan 100 is light and thin, and compared with the extremely small air outlet surface of the handheld fans already on the market, the portable bladeless fan 100 of the present application has a larger air outlet area while ensuring the air volume and air pressure. When the user uses it (such as when holding it or standing on a flat surface), at the same distance, the wind blown out by the portable bladeless fan 100 of the present application can contact more parts of the user, and the blowing effect is better. The rear side of the shell 1 is provided with an air intake plate 13, and the air intake plate 13 is provided with a first air intake portion 14. The front side of the shell 1 is connected to the pressure member 3, and the pressure member 3 and the shell 1 form a first air outlet portion 15 between the radial direction near the air outlet end F. The first air intake portion 14 and the first air outlet portion 15 are connected in the shell 1. A cover plate 16 is fixed to the rear side of the air intake plate 13. The cover plate 16 is provided with an air hole 161. The size of the air hole 161 is smaller than that of the first air intake portion 14 to prevent fingers or other foreign objects from entering the housing 1 through the first air intake portion 14, thereby improving safety in use. A distance is provided between the cover plate 16 and the air intake plate 13. At least a portion of the air intake plate 13 is recessed forward, while at least a portion of the cover plate 16 is recessed backward. This increases the radial air intake path between the air intake plate 13 and the cover plate 16, even though the air hole 161 on the cover plate 16 is smaller. At the same time, the first air intake portion 14 is larger, so the air volume is not affected by the smaller air hole 161 provided on the cover plate 16. The housing 1 is further divided into a first housing 11 and a second housing 12, which are arranged in a front-to-back relationship. The first housing 11 and the second housing 12 are fixed to each other via a fixing structure. The mixed flow fan 2 is substantially radially disposed within the first housing 11, and the pressure member 3 is substantially radially disposed within the second housing 12. The ratio of the front and rear lengths of the first housing 11 to the front and rear lengths of the second housing 12 is 1-1.5, achieving a reasonable balance between air volume and air pressure while achieving lightweight and thinness.

[0035] refer to Figure 3 、 Figure 5 、 Figure 8 and Figure 9The mixed flow fan 2 includes a rotating base 21 and a plurality of blades 22. The rotating base 21 includes an air guide surface 211 that radially increases from the air inlet end R to the air outlet end F. The plurality of blades 22 are connected and equidistantly arranged on the air guide surface 211. Each blade includes a blade root 221 connected to the air guide surface 211 and a blade top 222 away from the air guide surface 211. The blades 22 extend spirally at a predetermined angle from the air inlet end R to the air outlet end F and along the circumference of the air guide surface 211. When viewed from the air inlet end R to the air outlet end F, any two adjacent blades 22 have a first interval J1 at the air inlet end R and a second interval J2 at the air outlet end F. The ratio of the first interval J1 to the second interval J2 is in the range of 0.5-0.9, which is conducive to increasing the amount of air intake. Combined with reference Figure 3 The rotating base 21 is roughly truncated cone-shaped. The radial cross-sectional area of ​​the rotating base 21 at the air inlet end R is smaller than the radial cross-sectional area of ​​the rotating base 21 at the air outlet end F. The rotating base 21 has a relatively larger radial cross-sectional area at the air outlet end F. The rotating base 21 is recessed at the air outlet end F toward the air inlet end R to form a housing 23. The housing 23 is used to accommodate components such as the motor. The motor used in the mixed flow fan 2 is an outer rotor brushless motor 25 with a service life of up to 10,005 hours. It also eliminates the sparks generated by brushed motors, greatly reducing the interference of sparks with remote control radio equipment. When operating in a brushless manner, friction is greatly reduced, resulting in smooth operation and excellent noise reduction. Furthermore, the connection structure between the mixed flow fan 2 and the pressure member 3 is also accommodated in the housing 23, making excellent use of space. The rotating shaft 24 protrudes forward from the rear wall of the housing 23. The rear side of the pressure member 3 protrudes backward to form a boss 33. The rotating shaft 24 is fixed to the boss 33. At the same time, the outer rotor brushless motor 25 is accommodated in the accommodation portion 23 of the rotating base 21 , so that the rotating base 21 and the pressure member 3 are independently isolated from each other.

[0036] refer to Figure 3 、 Figure 5 and Figure 7 , there is a safe pressure distance D1 between the air intake plate 13 and the rear end of the rotating seat 21 to allow the air intake plate 13 to undergo maximum compression deformation within the pressure range allowed by the material properties. The distance between the air intake plate 13 and the rear end of the rotating seat 21 is 4.0-4.5mm (millimeter, the same below), so that there is space at the air inlet end R for large air volume to enter, and at the same time there is space for the air intake plate 13 to undergo maximum compression deformation when it is subjected to large air volume. Combined with reference Figure 9The radial cross-sectional area of ​​the air intake plate 13 is greater than or equal to the maximum radial cross-sectional area of ​​the rotating base 21 to ensure sufficient air intake and achieve noise reduction, transforming sharp noise into a low-pitched sound. Furthermore, the radial cross-sectional area of ​​the air intake plate 13 is less than or equal to the area of ​​the air intake window 2221 formed by the blade top 222 at the air intake end R, so that a high air pressure is initially generated at the air intake window 2221 formed by the blade top 222 at the air intake end R. In this embodiment, the radial cross-sectional radius of the air intake plate 13 is 27.7 mm, and the radial cross-sectional radius of the rear end of the rotating base 21 is 15.5 mm, but this is not intended to be limiting. In addition, the radial cross-sectional area of ​​the air intake plate 13 is less than or equal to the radial cross-sectional area of ​​the pressure seat 31 at the air outlet end F. The first air intake portion 14 on the air intake plate 13 is shielded by the pressure seat 31 at the front. During operation, the first air intake portion 14 is not visible from the front to the back. In other words, light from the first air intake portion 14 is not projected from the back to the front, thereby reducing the visual impact of the rotation of the mixed flow fan 2. At the air inlet end R, the blade top portion 222 is closer to the air intake plate 13 than the blade root portion 221, thereby enhancing the suction capacity of the mixed flow fan 2.

[0037] refer to Figure 5 and Figure 6 At least a portion of the wind guide surface 211 is recessed toward the rotating shaft 24, and the wind guide surface 211 is oriented as a whole to form an oblique angle with the rotating shaft 24 to define an oblique flow path, so that the axial wind near the rotating shaft 24 entering from the air inlet end R is changed into axial wind or oblique wind relatively away from the rotating shaft 24 through the oblique flow path, which is beneficial for reducing air volume loss, increasing wind pressure, and increasing air supply distance. It should be understood that at least a portion of the wind guide surface 211 can be recessed toward the rotating shaft 24, so that the mixed flow fan 2 gathers and expands the air volume and forms a high wind pressure, thereby shutting down the noise and wind noise of the outer rotor brushless motor 25 and converting sharp noise into a low sound. Of course, the wind guide surface 211 can also be an inclined plane, or can also be at least partially protruding away from the rotating shaft 24, and is not limited to this.

[0038] refer to Figure 3 、 Figure 5 、 Figure 6 and Figure 7The pressurizing member 3 includes a pressurizing seat 31 and a plurality of connecting members 32. The pressurizing seat 31 includes a pressurizing surface 311 that radially increases from the air inlet end R to the air outlet end F. A plurality of connecting members 32 are connected to and equidistantly arranged on the pressurizing surface 311. Each connecting member 32 includes a connecting root 321 connected to the pressurizing surface 311 and a connecting top 322 away from the pressurizing surface 311. At least some of the connecting members 32 are connected to the housing 1 and are hollow to form a negative pressure channel S. In this embodiment, the other connecting members 32 are also connected to the housing 1. Of course, since some of the connecting members 32 are already connected to the housing 1, the other connecting members 32 may also be disconnected from the housing 1. Excluding the hollow portion of the connector 32 that forms the negative pressure channel S, the other connectors 32 include a guide curved surface 323. The guide curved surface 323 is close to the blade 22. Looking from the back to the front, the connector 32 extends forward in a counterclockwise direction. The oblique flow formed by the mixed flow fan 2 passes through the guide curved surface 323 to form a direct flow of wind that is blown out in parallel with the rotating shaft 24, so as to increase the blowing distance and quickly pressurize the wind formed by the mixed flow fan 2. The connecting top 322 is connected to the shell 1, and the rotating seat 21 is connected to the pressurizing seat 31 through a fixed fitting structure. The mixed flow fan 2 is relatively fixed in the shell 1 through the pressurizing member 3. The radius of the pressurizing member 3 at the maximum diameter surface of the air outlet end F is 28-35mm, which expands the blowing area while ensuring sufficient air volume and air pressure.

[0039] At the same time, the connecting member 32 combs and transforms the passing wind, reducing turbulence, noise and vibration, and reducing the noise generated by turbulent crosstalk, achieving noise reduction, thereby converting sharp noise into a low sound; and greatly improving the static pressure, reducing energy consumption, and strengthening the concentration of the air output of the mixed flow fan 2. The connecting member 32 evens out the wind formed by the mixed flow fan 2 and increases the wind pressure. The connecting top 322 is connected to the shell 1, and the connecting line between the front and rear ends of the connecting root 321 and the connecting line between the front and rear ends of the connecting top 322 form an acute angle, that is, the shell 1 and the pressurized surface 311 extend forward while extending closer to each other, so that the wind is pressurized and discharged from the gap between the shell 1 and the pressurized surface 311, which is conducive to increasing the wind force and air supply distance.

[0040] refer to Figures 4 to 7The pressurizing seat 31 is also roughly truncated cone-shaped. The minimum radial cross-sectional area of ​​the pressurizing seat 31 is larger than the maximum radial cross-sectional area of ​​the rotating seat 21. The radial cross-sectional area of ​​the pressurizing seat 31 at the air inlet end R is smaller than the radial cross-sectional area of ​​the pressurizing seat 31 at the air outlet end F. The pressurizing seat 31 has a relatively large radial cross-sectional area at the air outlet end F. The pressurizing seat 31 is recessed backward at the air outlet end F to form a cavity 34. At the same time, the pressurizing seat 31 and the shell 1 form the first air outlet portion 15 at the air outlet end F. The first air outlet portion 15 is located radially outside the cavity 34. The area within the cavity 34 forms a first high negative pressure zone A. In this embodiment, a cover body 35 with a through hole 351 is also provided in the cavity 34. Of course, in other embodiments, the cover body 35 may not be provided. The radial cross-section of the pressurizing seat 31 at the air outlet end F is larger, and the wind is pressurized and discharged from the gap between the pressurizing seat 31 and the shell 1 at the air outlet end F, which is conducive to realizing the reuse of the negative pressure wind guiding function and the pressurizing function of the pressurizing seat 31.

[0041] refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 7 The portable bladeless fan 100 further includes a second air inlet 17 and a second air outlet 18. The second air inlet 17 is disposed radially outward of the housing 1, and the second air outlet 18 is disposed radially inward of the pressurizing seat 31 and radially inward of the first air outlet 15. In this embodiment, the second air outlet 18 is located radially inward of the accommodating cavity 34. The negative pressure channel S connects the second air inlet 17 and the second air outlet 18. While ensuring that the first air outlet 15 discharges the pressurized mixed flow, the negative pressure channel S guides air to continuously supplement the first high negative pressure area A, thereby reducing the drag and interference of the pressurized mixed flow, stabilizing the air output, and increasing the air volume and air delivery distance. Of course, in other embodiments, the second air outlet 18 may also be located radially inward of the pressurizing seat 31 and in front of a portion of the connecting member 32, and radially inward of and in the radial direction of the first air outlet 15. The negative pressure channel S connects the second air inlet 17 and the second air outlet 18 to guide the pressurized mixed flow within the housing 1 in the radial direction of the first air outlet 15, thereby achieving negative pressure air guidance and circumferential air supply. Alternatively, the second air outlet 18 may be located only in front of a portion of the connecting member 32 to achieve circumferential air supply.

[0042] refer to Figures 4 to 7At least a portion of the pressure surface 311 radially increases from the air inlet end R to the air outlet end F. Simultaneously, at least a portion of the pressure surface 311 is recessed toward the rotation axis. Specifically, the pressure surface 311 first radially increases from the air inlet end R to the air outlet end F and then extends forward parallel to the rotation axis 24. Of course, in other embodiments, the pressure surface 311 may first extend forward parallel to the rotation axis 24 and then radially increase, or may generally increase radially, or may remain generally unchanged radially, or may at least partially decrease radially, from the air inlet end R to the air outlet end F. This is not limiting. The radial cross-section of the cavity 34 is circular. The cavity 34 includes an end face 341 located at the rear and a radially connected peripheral wall 342 connected to the end face 341. In the axial direction, the end face 341 is located behind the first air outlet 15 to form the first high negative pressure area A. The second air outlet 18 is located radially inward of the peripheral wall 342 to shorten the length of the negative pressure channel S. Although the cover 35 is provided in this embodiment, the through hole 351 is provided on the cover 35. The through hole 351 is interconnected with the second air outlet 18 and is at least partially aligned with the second air outlet 18. Therefore, the second air outlet 18 can still continuously guide negative pressure air to the first high negative pressure area A. Of course, the second air outlet 18 can also be located on the end face 341 or other parts of the pressurizing seat 31. Corresponding to the pressure surface 311, the peripheral wall 342 first radially increases forward from the end surface 341 and then extends forward parallel to the rotation axis 24 to facilitate the fixing and removal of the air inducing member 4. Of course, the peripheral wall 342 can also be entirely radially increased forward from the end surface 341, or the peripheral wall 342 can also first extend forward from the end surface 341 parallel to the rotation axis 24 and then radially increase forward, and this is not a limitation.

[0043] refer to Figures 4 to 7The air inducing member 4 includes a seat portion 41 and a fixing portion 42 protruding from the surface of the seat portion 41. The fixing portion 42 is used to fix the portable bladeless fan 100. The seat portion 41 includes a central portion 411 and an edge portion 412 connected to the central portion. The edge portion 412 bends and extends from the central portion 411 in a direction opposite to the protruding direction of the fixing portion 42. The central portion 411 matches the end surface 341, and the edge portion 412 matches the peripheral wall 342. In other words, the shape of the air inducing member 4 matches the shape of the cavity 34 to form a second high negative pressure area B, so that the air inducing member 4 is entirely accommodated in the cavity 34. Because the first air outlet portion 15 is located radially outside the cavity 34, the second high negative pressure area B can achieve the same air outlet effect when the air inducing member 4 is used to fix the portable bladeless fan 100 to an external object and when it is accommodated in the cavity 34. The air inducing member 4 is correspondingly provided with a vent 43, and the vent 43 is communicated with the second air outlet portion 18, so as to ensure that the first air outlet portion 15 discharges the pressurized mixed flow, and continuously supplement the second high negative pressure area B with air through the negative pressure channel S, thereby reducing the air flow pulling and interference of the pressurized mixed flow, making the air outlet stable and increasing the air volume and air supply distance, so as to achieve the equivalent air outlet effect when the air inducing member 4 fixes the portable bladeless fan 100 to an external object and accommodates it in the cavity 34.

[0044] In this embodiment, the center portion 411 and the edge portion 412 form a semi-open receiving portion 413, and the receiving portion 413 is used for a detachable device 414, and the device 414 is used to set an IP image item (not shown, the same below). The device 414 and the IP image item are entirely received in the receiving portion 413. That is, when the air induction member 4 is fixed in the cavity 34, the IP image item will not protrude forward from the receiving portion 413; when the air induction member 4 is fixed to the holding member 19, the IP image item will not protrude forward from the receiving portion 413. Figure 1 , the IP image item faces external objects and does not protrude, so as to realize the reuse of the fixing function and decorative function of the draft member 4. The device 414 can also be provided with other totems, colors or other possible decorations or combinations. Of course, in other embodiments, the housing portion 413 can also be used to store a USB harness (not shown, the same below), and the USB harness is housed in the housing portion 413 as a whole, so as to realize the reuse of the fixing function and the storage function of the draft member 4; the housing portion 413 can also be used to store a spray component (not shown, the same below), and the spray component is housed in the housing portion 413 as a whole, so as to realize the reuse of the fixing function and the humidification function of the draft member 4. Specifically, the housing portion 413 can also be used to set components such as aromatherapy and mirrors to realize the multifunctional reuse of the draft member 4.

[0045] refer to Figures 4 to 7 , wherein the device 414 is correspondingly arranged in the center part 411, and the center part 411 is close to the edge part 412 and / or the edge part 412 is correspondingly provided with the vent 43 connected to the second air outlet part 18, and there is a gap between the vent 43 and the device 414 to realize the reuse of the fixing function, storage function and negative pressure air guiding function of the air inducing member 4. Moreover, due to the provision of the through hole 351, the through hole 351 on the cover body 35 and the second air outlet portion 18 are at least partially aligned, and the fixing portion 42 protrudes from the surface of the seat portion 41, so the fixing portion 42 creates a gap between the seat portion 41 and the cover body 35. Of course, a gap may also be provided between the seat portion 41 and the cover body 35. Therefore, when the fixing member 4 is installed in the cavity 34, the vent 43 does not need to be aligned with the through hole 351, and communication between the vent 43 and the through hole 351 can also be achieved. When the fixing member 4 is rotated, the position of the vent 43 can also be changed, thereby changing the air outlet position of the negative pressure air guide.

[0046] refer to Figures 4 to 7 , combined with Figure 1 When the fixing portion 42 cooperates with the holding member 19, the portable bladeless fan 100 is fixed to an external plane, and the maximum radial cross-sectional area of ​​the seat portion 41 is larger than the cross-sectional area of ​​the holding member 19, so as to secure the portable bladeless fan 100 to the external plane. Specifically, in this embodiment, the holding member 19 is the handle, and the shape of the fixing portion 42 matches the shape of the bottom of the handle. When the air inducing member 4 is fixed to the bottom of the handle, the portable bladeless fan 100 is fixed to the external plane. Of course, in other embodiments, the seat portion 41 may be provided with an adsorption member such as a suction cup to adsorb the portable bladeless fan 100 to an external object; or, the seat portion 41 may be provided with a hanging member such as a hook or a hanging rope to hang the portable bladeless fan on an external object.

[0047] refer to Figure 3 、 Figure 5 and Figure 7A pressurized flow guide channel T is formed between the pressurized component 3 and the mixed flow fan 2 and the housing 1. The radial cross-sectional area of ​​the pressurized flow guide channel T at the air inlet end R is larger than the radial cross-sectional area at the air outlet end F. Air enters the pressurized flow guide channel T from the first air inlet portion 14, forms a pressurized mixed flow in the pressurized flow guide channel T, and is then discharged from the first air outlet portion 15. After the air enters the mixed flow fan 2 axially from the air inlet end R, it leaves the air outlet end F. The mixed flow fan 2 combines the advantages of a large air volume of an axial flow fan and a high air pressure of a centrifugal fan. At the same time, the pressurized flow guide channel T formed between the mixed flow fan 2 and the pressurized component 3 and the housing 1 has a large radial cross-sectional area at the air inlet end R, which is conducive to absorbing air and increasing air volume; and a small radial cross-sectional area at the air outlet end F, which is conducive to compressing air and increasing air pressure. The characteristic of the mixed flow fan 2 discharging air in an oblique direction further increases the wind pressure and the air supply distance, thereby achieving a large air volume and high air pressure on a smaller portable bladeless fan 100, achieving rapid cooling and improving the user experience.

[0048] refer to Figures 5 to 7 , the mixed flow fan 2 and the pressure member 3 are arranged closely spaced in the axial direction, that is, the rotating seat 21 and the pressure seat 31 are arranged closely spaced in the axial direction, and the radial cross-section of the rotating seat 21 at the air outlet end F and the radial cross-section of the pressure seat 31 at the air inlet end R are both circular, and the difference in radius between the two is very small. In this embodiment, the difference in radius between the two is less than 2mm, of course, this is not a limitation, as long as the pressure surface 311 and the air guide surface 211 are also arranged closely spaced in the axial direction to block the wind from entering The equivalent seamless connection gap D2 between the rotating seat 21 and the pressurizing seat 31 blocks the wind from entering the equivalent seamless connection gap D2 between the rotating seat 21 and the pressurizing seat 31. The wind formed by the mixed flow fan 2 at the rear end is blown directly in the face, thereby continuing to flow forward, so that the wind can more smoothly enter the portion of the pressurized guide channel T between the wind guide surface 211 and the shell 1 from the portion of the pressurized guide channel T between the pressurizing surface 311 and the shell 1, thereby reducing eddy current loss and turbulent crosstalk noise. Specifically, the equivalent seamless connection gap D2 between the rotating seat 21 and the pressurizing seat 31 in the axial direction is 1-1.5mm, so that the wind formed by the mixed flow fan 2 can flow smoothly to the pressurizing member 3. Of course, this is not a limitation, as long as the wind entering the equivalent seamless connection gap D2 between the rotating seat 21 and the pressurizing seat 31 can be reduced.

[0049] refer to Figure 6The wind-guiding surface 211 includes a first extension section 2111 adjacent to one end of the pressure surface 311, and the pressure surface 311 includes a second extension section 312 adjacent to one end of the wind-guiding surface 211. The first extension section 2111 and the second extension section 312 have the same extension direction, so that the connection between the wind-guiding surface 211 and the pressure surface 311 is smoother.

[0050] refer to Figure 7 The blades 22 and the connectors 32 are spaced closely together in the axial direction to form an equivalent partition gap D3. The minimum equivalent partition gap D3 between the blades 22 and the connectors 32 is 1-1.5 mm. This prevents the airflow generated by the mixed flow fan 2 at the air outlet F from flowing back to the air inlet R along the axial gap between the blades 22 and the connectors 32, and prevents cross-flow between two adjacent connectors 32. This simplifies the airflow and increases air pressure, achieving the effects of guiding air and reducing noise. Of course, the minimum equivalent partition gap D3 between the blades 22 and the connectors 32 is not limited to this, as long as the airflow between the blades 22 can flow smoothly to the connectors 32, reducing return flow losses.

[0051] Reference Figure 3 、 Figure 7 and Figure 9 Viewed from the rear to the front, the blades 22 connect to the wind-guiding surface 211 and extend forward in a clockwise, oblique direction. A portion of the connector 32 connects to the pressure surface 311 and extends forward in a counterclockwise, oblique direction. The lines connecting the front and rear ends of the blades 22 to the wind-guiding surface 211 and the lines connecting the front and rear ends of the connector 32 to the pressure surface 311 form an angle to increase wind pressure. Furthermore, the curvature of a portion of the connector 32 is greater than that of the blades 22 to further increase wind pressure. Of course, the curvatures of the blades 22 and a portion of the connector 32 are not limited to this.

[0052] refer to Figure 3 and Figure 9 In this embodiment, the number of the blades 22 is 7, and the number of the connecting parts 32 is 8. In other embodiments, the ratio of the number of the blades 22 to the number of the connecting parts 32 can also be in the range of 3 / 7-1. Of course, this is not a limitation, as long as the portable bladeless fan 100 can ensure better suction and pressure capabilities of the wind.

[0053] refer to Figure 5 and Figure 6From the air inlet end R to the air outlet end F, the mixed flow fan 2 and the pressure seat 31 are radially enlarged as a whole into a trumpet shape to form an outward-expanding pressure slope M. Specifically, the rotating seat 21 and the pressure seat 31 are radially enlarged as a whole into a trumpet shape to form an outward-expanding pressure slope M. The pressure slope M increases the pressure stroke of the airflow. The pressure slope M includes the air guide surface 211 and the pressure surface 311, and the two-stage pressure application is increased, resulting in a better pressure effect.

[0054] refer to Figures 4 to 7, the axial length of the front and rear ends of the rotating seat 21 is 0.8-1 or 1-1.5 times the axial length of the front and rear ends of the pressurizing seat 31, so that after the airflow is subjected to high-pressure wind gathering by the blades 22, it is combed by the equivalent distance through the connecting piece 32 to ensure the maximum usable air volume constructed by the high-pressure air volume of the final airflow generated by the pressurizing piece 3 and the external negative pressure air volume, as well as the aggregated air supply distance of the maximum usable air volume. It should be understood that the high pressure of the final airflow generated by the pressurizing piece 3 can drive the negative pressure air near the outside of the shell 1, thereby further increasing the air volume. Preferably, the axial length of the front and rear ends of the mixed flow fan 2 and the axial length of the front and rear ends of the pressurizing piece 3 are 1:1, which can meet the large air volume requirements in the use scenario of the portable bladeless fan 100, and the product is light and thin; and the 1:1 ratio is handheld, and its appearance is more in line with the aesthetic concept of symmetry. The pressure member 3 is provided with the cavity 34 for accommodating the air-inducing member 4 at the air outlet end F. When the axial lengths of the front and rear ends of the pressure seat 31 are limited, the difference between the depth value of the cavity 34 and the length value of the pressure member 3 from the air inlet end R to the air outlet end F is less than a first difference value, and the difference between the radius value of the maximum opening of the cavity 34 and the radius value of the maximum diameter surface of the pressure member 3 at the air outlet end F is less than a second difference value, so as to realize the reuse of the pressure member 3 in the pressurizing function and the accommodating function. Furthermore, when the thickness of the rotating seat 21 and the pressurizing seat 31 is limited, the outwardly expanded pressurizing slope M can also make the radius of the end face 341 of the cavity 34 adjacent to the rotating seat 21 and the radius of the radial cross-section of the housing 1 at the air outlet end F less than a third difference value. This increases the accommodating space of the cavity 34 for accommodating the air inducing member 4 by increasing the radial cross-sectional area of ​​the end face 341 of the cavity 34 adjacent to the rotating seat 21 when the depth of the cavity 34 is limited. The first difference value and the second difference value are both 1.3-1.7 mm, and the third difference value is 6.2-6.8 mm, ensuring that the cavity 34 has sufficient radial space to accommodate the air inducing member 4 and has sufficient space to form the first high negative pressure zone A, while ensuring that the airflow is pressurized and discharged from the gap formed between the pressurizing slope M and the housing 1 at the air outlet end F. Of course, in other embodiments, the first difference value, the second difference value and the third difference value may also be adjusted to other values, as long as the accommodation function and the pressurizing function of the pressurizing member 3 can be balanced.

[0055] refer to Figures 5 to 7The pressurized inclined surface M and the shell 1 form the pressurized flow guide channel T, and the pressurized inclined surface M includes the air guide surface 211 and the pressurized surface 311. The cooperation between the pressurized inclined surface M and the shell 1 achieves noise reduction, so as to convert sharp noise into low sound. The pressurized flow guide channel T includes a first channel T1 and a second channel T2 connected to each other. The first channel T1 is formed between the air guide surface 211 of the mixed flow fan 2 and the first shell 11 in the radial direction, and the second channel T2 is formed between the pressurized surface 311 of the pressurized seat 31 and the second shell 12 in the radial direction. The minimum radial cross-sectional area of ​​the first channel T1 is greater than or equal to the maximum cross-sectional area of ​​the second channel T2.

[0056] refer to Figures 5 to 7 In the radial direction, the first housing 11 includes a first flow-guiding surface 111 facing the air-guiding surface 211. Both the air-guiding surface 211 and the first flow-guiding surface 111 are annular. At least a portion of the air-guiding surface 211 is radially recessed to form a concave surface. The first flow-guiding surface 111 radially increases in size from the air inlet end R to the air outlet end F. At least a portion of the first flow-guiding surface 111 radially protrudes to form a convex surface. This allows the structure of the first channel T1 to simultaneously gather and generate a large air volume when pressurized. Of course, this is only one form of the air-guiding surface 211 and the first flow-guiding surface 111 and is not intended to be limiting.

[0057] refer to Figures 5 to 7 In the radial direction, the second housing 12 includes a second flow-guiding surface 121 facing the pressure surface 311. Both the pressure surface 311 and the second flow-guiding surface 121 are annular. At least a portion of the pressure surface 311 radially increases and is radially recessed to form a concave surface. The second flow-guiding surface 121 radially decreases from the air inlet end R to the air outlet end F, and at least a portion of the second flow-guiding surface 121 radially protrudes to form a convex surface. This allows the structure of the second channel T2 to further rapidly pressurize the high-volume, high-pressure wind generated at the rear to form high-pressure wind. Of course, this is only one form of the pressure surface 311 and the second flow-guiding surface 121 and is not intended to be limiting.

[0058] The first guide surface 111 and the second guide surface 121 are both convex surfaces formed by radial projections, and the first guide surface 111 and the second guide surface 121 first radially increase and then radially decrease from the air inlet end R to the air outlet end F to form a smooth and complete arc surface. The first guide surface 111 and the second guide surface 121 not only increase the air volume and air pressure, but also improve the aesthetics of the housing 1. The radial distance between the second guide surface 121 and the air outlet end F and the rotating shaft 24 is greater than the radial distance between the first guide surface 111 and the air inlet end R and the rotating shaft 24, which helps to blow the air belt near the middle of the rotating shaft 24 to a position radially relatively far away from the rotating shaft 24, thereby increasing the air supply distance.

[0059] refer to Figures 4 to 6 The axial wind at the air inlet end R is changed to flow obliquely forward along the air guide surface 211, so that the wind closer to the axial direction can flow obliquely outward; the oblique wind of the mixed flow fan 2 at the air outlet end F is changed to flow obliquely forward along the pressure surface 311, and further obliquely outward, so as to leave enough space at the part of the pressure member 3 close to the axis, and the enough space can be used to accommodate the air induction member 4. The line connecting the front and rear ends of the air guide surface 211 forms a first angle a with the rotating shaft 24, and the line connecting the front and rear ends of the pressure surface 311 forms a second angle b with the rotating shaft 24. The first angle a is greater than the second angle b, so as to increase the wind pressure while reducing the loss of air volume. The range of the first angle a is 30-45 degrees, and the range of the second angle b is 5-15 degrees. The air guide surface 211 is at least partially recessed toward the rotating shaft 24, and the axial wind at the air inlet end R flows along the air guide surface 211 with a sudden increase in slope to be rapidly pressurized. The pressurizing surface 311 first increases radially and then remains radially constant from the air inlet end R to the air outlet end F. Both the radially increasing portion and the radially constant portion of the pressurizing surface 311 are flat surfaces. The wind generated by the mixed flow fan 2 is secondary pressurized along the pressurizing surface 311, whose slope decreases gradually. The wind is rapidly pressurized by the air guide surface 211 and secondary pressurized by the pressurizing surface 311, forming high-pressure wind. This ensures that the portable bladeless fan 100 has excellent blowing performance and a long air delivery distance. Furthermore, the two-stage inclined structure also provides wind guidance and noise reduction.

[0060] refer to Figure 5 、 Figure 7 and Figure 8 , from the air inlet end R to the air outlet end F, at least a portion of the air guide surface 211 is recessed toward the rotating shaft 24, so that the mixed flow fan 2 gathers air volume and forms a first high air pressure; Figure 4 , viewed from left to right, the distance between the radial gap between the blade top 222 and the housing 1 in the radial direction decreases from the air inlet end R to the air outlet end F, but combined with Figure 8 The distance of the minimum radial gap between the blade top 222 and the shell 1 is maintained within the error range of the equivalent isolation distance D4, so as to isolate the airflow generated by the mixed flow fan 2 at the air outlet end F from flowing back around the minimum radial gap to the mixed flow fan 2 at the air inlet end R, thereby increasing the second high wind pressure and reducing the noise of turbulent crosstalk; the distance between any two adjacent blades 22 gradually increases from the air inlet end R to the air outlet end F to increase the third high wind pressure; the connecting member 32 evens out the wind formed by the mixed flow fan 2 and increases the fourth high wind pressure.

[0061] The first high wind pressure is formed on the basis of gathering a large amount of air at the air inlet end R, and the second high wind pressure, the third high wind pressure and the fourth high wind pressure are increased at the same time. The mixed flow fan 2 has the ability to form a large air volume and a high wind pressure, so as to produce wind with a large air volume and a high wind pressure in the smaller portable bladeless fan 100, and increase the air supply distance, thereby perfectly meeting the needs of users.

[0062] Since the portable bladeless fan 100 has a delicate and compact structure, its plate is thin and light, and its structure is easily broken. During the R&D experiment, slight adjustments to each structure, angle, curvature, aperture, and air duct length will bring about significant changes to the product's air volume, air pressure, and wind noise. In addition, during the later mass production process, there will be problems with demolding, or it will be necessary to try through complex and high-cost processes. This is completely different from the difficulty of achieving Dyson's large-scale products. Therefore, even Dyson does not have related products and patented technologies, let alone other companies with low R&D capabilities that develop and produce products and patents with related technologies. For this reason, the applicant has undergone hundreds of thousands of combinations of complex hand-testing, experiments, and tests on at least five variable factors of the above-mentioned structure, angle, curvature, aperture, and air duct length, and finally obtained a relatively optimal parameter combination of the structure, angle, curvature, aperture, air duct length, etc. of the present application, striking a balance between air volume, air pressure, and wind noise, and making a subversive product with user experience as the ultimate goal.

[0063] The above detailed description is only an illustration of the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and illustrations of this invention are included in the patent scope of this invention.

Claims

1. A portable bladeless fan, characterized in that: include: include: A housing, having a first air inlet portion provided on the rear side and a first air outlet portion provided on the front side, wherein the first air inlet portion and the first air outlet portion are connected in the housing; a mixed flow fan, the mixed flow fan being located in the housing and rotating about a rotation axis to generate airflow, the mixed flow fan comprising a rotating seat; A pressure piece is connected to the front side of the mixed flow fan, and a pressurized guide channel is formed between the mixed flow fan and the pressure piece and the shell. The pressure piece includes a pressure seat, and the rotating seat and the pressure seat have an equivalent seamless connection gap. The wind blocked from entering the equivalent seamless connection gap between the rotating seat and the pressure seat is blown directly in the face by the wind formed by the mixed flow fan at the rear end, thereby continuing to flow forward.

2. The portable bladeless fan according to claim 1, wherein: The equivalent seamless connection interval is 1-1.5 mm.

3. The portable bladeless fan according to claim 1, wherein: The portable bladeless fan also includes an air intake plate and a cover plate. The air intake plate is arranged on the rear side of the shell, and the first air intake part is provided on the air intake plate. The cover plate is fixed on the rear side of the air intake plate, and air holes are provided on the cover plate. The size of the air holes is smaller than the size of the first air intake part.

4. The portable bladeless fan according to claim 3, wherein: There is a distance between the cover plate and the air intake plate, and at least a portion of the air intake plate is recessed forward, while at least a portion of the cover plate is recessed backward.

5. The portable bladeless fan according to claim 3, wherein: The pressurizing seat includes an end surface opposite to the air inlet plate, an outer annular surface of the end surface is a plane, and the outer annular surface is perpendicular to a horizontal plane.

6. The portable bladeless fan according to claim 5, wherein: The rotating seat includes a wind guide surface, and the projection of the wind guide surface in the axial direction falls into the outer annular surface.

7. The portable bladeless fan according to claim 1, wherein: The pressurizing seat further comprises a pressurizing surface which increases radially from the rear to the front.

8. The portable bladeless fan according to claim 7, wherein: The pressure member also includes a connecting member, which includes a connecting root connected to the pressure surface and a connecting top connected to the shell, and an acute angle is formed between the connecting line between the front and rear ends of the connecting root and the connecting line between the front and rear ends of the connecting top.

9. The portable bladeless fan according to claim 1, wherein: The radius of the maximum diameter surface of the pressure member is 28-35 mm.

10. The portable bladeless fan according to claim 1, wherein: The length of the pressure member along the axis is smaller than the length of the mixed flow fan in the axial direction.

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