Portable bladeless fan

Abstract

The invention provides a portable bladeless fan which comprises a shell provided with a first air inlet part and a first air outlet part, and the first air inlet part and the first air outlet part are communicated in the shell; the pressurizing part is connected with the front side of the shell and comprises a pressurizing seat, and the pressurizing seat and the shell form a first air outlet part at the air outlet end; the mixed flow fan is located in the shell and rotates around a rotating shaft to generate airflow; and an area formed by the pressurizing seat at the air outlet end in a backward concave manner is a first high negative pressure area.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and specifically to a portable bladeless fan with high air volume and high air pressure. Background Technology

[0002] The most common type of fan in daily life is the axial fan. The characteristic of an axial fan is that the airflow path from the inlet to the outlet does not deviate radially; it is essentially equivalent to straight in and straight out. Air enters the axial fan axially from the inlet and exits axially from the outlet. This design results in low wind resistance and therefore minimal airflow loss. In other words, those skilled in the art, by default, assume that axial fans will be manufactured using axial blades to ensure minimal airflow loss. Over time, this has become a consensus, leading to a difficult-to-change technical bias. Because of this, those skilled in the art have not proposed solutions to this technical problem. Using axial fans by default is foolproof, requires less R&D investment, has low costs, and allows for quick sales and profits in the capital market.

[0003] However, unlike other companies in this field that pursue low R&D costs and rapid product launches to seize market share and profits, the inventors of this application have consistently focused on the field of fan technology. They have conducted in-depth investigations and understanding of fluid theory, the fan product market, and user pain points and needs. Through research in this industry, they discovered that, taking handheld fans or ordinary desktop fans as examples, although existing axial fans have low wind resistance and minimal airflow loss, they completely fail to consider another technical problem: the low air pressure and short air delivery distance of axial fans. In other words, although there is no airflow loss, there is no incremental increase to compensate, and the air delivery distance is difficult to guarantee. Therefore, the typical operating distance of ordinary portable fans is about 1-1.5 meters; beyond a slightly longer distance, the refreshing feeling of being cooled cannot be experienced. At the same time, because the blades of axial fans are visible, infants and young children are prone to cutting their fingers when using them. If toys, chopsticks, or other foreign objects are inserted into the blades, they are prone to breakage or even flying fragments that can cut the user. Existing axial fans completely fail to meet users' safety requirements.

[0004] Furthermore, the inventors of this application have discovered that some portable fans use centrifugal blades to overcome the difficulty of low air pressure, but after the air enters the centrifugal fan axially from the air inlet, it leaves radially from the air outlet, resulting in a large change in air direction and a serious loss of air volume, making it difficult to meet the user's requirements for air output.

[0005] Furthermore, although it is well known in the industry that Dyson has been producing bladeless fans, they use ultra-high-speed fans to achieve the required airflow, resulting in a size of approximately 30*30*150 cm³, which is very large, inconvenient to use, and even less portable. In addition, Dyson fans are generally priced between 3,000 and 8,000 RMB, which is very expensive for ordinary families or individuals, and can even be considered a luxury item. Therefore, they are of no practical value to ordinary users.

[0006] Due to the aforementioned technical problems and biases, existing portable fans can no longer fully meet users' 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 around are also increasing. After in-depth research on the aforementioned technical problems, biases, user needs, safety issues, and market products, the inventors of this application, after several years of research and experimentation, have proposed a portable bladeless fan to design a structure with large air volume and high air pressure in a small portable fan, thereby solving many of the aforementioned problems in this technical field. Summary of the Invention

[0007] In view of this, the present invention provides a portable bladeless fan, which provides a negative pressure channel on the pressurizing component to guide the air from the radially outer side of the housing to the radially inner side of the housing. Based on the sufficient air volume and air pressure discharged from the first air outlet, the air volume and air delivery distance are further increased by guiding the air through the negative pressure channel.

[0008] This invention provides a portable bladeless fan, comprising: a housing with a first air inlet on the rear side and a first air outlet on the front side, the first air inlet and the first air outlet being connected within the housing; a pressurizing component connected to the front side of the housing, the pressurizing component having a negative pressure channel that guides air from the radially outer side of the housing to the radially inner side of the housing; and a mixed-flow fan located within the housing and connected to the rear side of the pressurizing component, the mixed-flow fan rotating around a pivot to generate airflow; wherein, the mixed-flow fan and the pressurizing component together form a pressurized flow channel with the housing, air enters the pressurized flow channel from the first air inlet, forms pressurized mixed flow within the pressurized flow channel, and is discharged from the first air outlet, simultaneously driving air from the radially outer side of the housing to flow through the negative pressure channel and be discharged from the radially inner side of the housing, thereby ensuring sufficient airflow and air pressure discharged from the first air outlet, and further increasing the airflow and delivery distance through the negative pressure channel.

[0009] Furthermore, the mixed-flow fan includes a rotating base that increases radially from the air inlet to the air outlet, and a plurality of blades connected and equidistantly arranged around the rotating base; the pressurizing component includes a pressurizing base that increases radially from the air inlet to the air outlet, and a plurality of connectors connecting the outer circumference of the pressurizing base and the inner circumference of the housing, at least some of the connectors connecting the housing and hollow to form the negative pressure channel; the rotating base and the pressurizing base together form the pressurized flow channel with the housing, and the axial length of the front and rear ends of the rotating base is 1-1.5 times the axial length of the front and rear ends of the pressurizing base.

[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 greater than the maximum radial cross-sectional area of ​​the rotating seat. The second air inlet is located on the radial outer side of the housing, and the second air outlet is located on the radial inner side of the pressurizing seat and on the radial inner side of the first air outlet. The negative pressure channel connects the second air inlet and the second air outlet, so that air can be discharged in the radial direction of the first air outlet, while air can be discharged in the radial inner area of ​​the pressurizing seat at the same time, realizing the reuse of the pressurizing seat in pressurizing function and negative pressure guiding function.

[0011] Furthermore, the pressurizing seat has a recessed cavity at the air outlet end. The first air outlet is located radially outside the cavity, and the area inside the cavity forms a first high negative pressure zone. The second air inlet is located radially outside the housing, and the second air outlet is located radially inside the cavity. This ensures that the pressurized mixed flow is discharged from the first air outlet, while the negative pressure channel continuously replenishes the first high negative pressure zone inside the cavity with air, thereby reducing the airflow pulling and interference of the pressurized mixed flow, stabilizing the airflow, and increasing the air volume and delivery distance.

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

[0013] Furthermore, it also includes an air guide member housed in the cavity. The air guide member includes a central portion and an edge portion. The edge portion bends and extends from the central portion in a direction away from the cavity. The central portion matches the end face, and there is a gap between the central portion and the end face. The edge portion matches the peripheral wall to form a second high negative pressure zone. The air guide member is provided with a vent, which is connected to the second air outlet. The air is continuously replenished to the second high negative pressure zone through the negative pressure channel, thereby reducing the airflow pulling and interference of the pressurized mixed flow, stabilizing the airflow and increasing the air volume and delivery distance.

[0014] Furthermore, it also includes a second air inlet and a second air outlet. The second air inlet is located radially outward of the housing, and the second air outlet is located radially inward of the pressurizing base and in front of the connector, and is located radially inward of the first air outlet and radially upward of the first air outlet. The negative pressure channel connects the second air inlet and the second air outlet to achieve negative pressure air guiding and circumferential air replenishment based on the pressurized mixed flow in the housing in the radial direction of the first air outlet.

[0015] Furthermore, the rotating base includes a guide surface that increases radially from the air inlet end to the air outlet end, and the pressurizing base includes a pressurizing surface that increases radially from the air inlet end to the air outlet end. The guide surface and the pressurizing surface are arranged adjacent to each other at intervals, and the axial distance between the guide surface and the pressurizing surface is 1-1.5mm, so as to avoid turbulence between the rotating base and the pressurizing base, avoid noise generated by turbulence crosstalk, and thus allow the air generated by the mixed flow fan to flow smoothly to the pressurizing base.

[0016] Furthermore, the rotating seat has a recessed receiving portion at the air outlet end, the mixed-flow fan uses an external rotor brushless motor, and the external rotor brushless motor is housed in the rotating seat to achieve independent isolation between the rotating seat and the pressurizing seat; and / or the radius of the radial section of the pressurizing seat at the air outlet end is 28-35mm, which expands the blowing area while ensuring sufficient air volume and air pressure.

[0017] Furthermore, the portable bladeless fan is a handheld bladeless fan with a handle, or a clamping fan with a clip, or a versatile fan with a bending shaping part for winding, or a desktop fan with a stand, or a floor fan with a telescopic stand.

[0018] Compared with the prior art, the portable bladeless fan of the present invention has the following beneficial effects: by setting a negative pressure channel on the pressurizing member, the air on the radially outer side of the housing is guided to the radially inner side of the housing, thereby, on the basis of sufficient air volume and air pressure discharged from the first air outlet, the air on the radially outer side of the housing is fully absorbed and utilized through the negative pressure channel, further increasing the air volume and air delivery distance. Attached Figure Description

[0019] Figure 1 This is a perspective view of the first state of the portable bladeless fan air intake component of the present invention;

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

[0021] Figure 3 yes Figure 2 An exploded 3D view of a portable bladeless fan from one angle;

[0022] Figure 4 yes Figure 2 Another perspective of the exploded 3D view of a portable bladeless fan;

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

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

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

[0026] Figure 8 This is a front-to-back 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 a hidden cover and a transparent housing. Detailed Implementation

[0028] To facilitate a better understanding of the purpose, structure, features, and effects of this invention, the invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0029] To facilitate understanding of the technical solution of this invention, the X-axis in the three-dimensional coordinate system of the accompanying drawings is defined as the left-right direction, the Y-axis as the front-back direction, and the Z-axis 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 This is a perspective view of the portable bladeless fan 100 of the present invention. Figure 3 and Figure 4 These are exploded views of the portable bladeless fan 100 of the present invention from 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, equipped with a handle (not shown, the same below) for the user to hold, and the handle is the retaining member 19. Of course, the portable bladeless fan 100 can also be a clamping fan equipped with a clip, or a versatile fan equipped with a bending shaping member for winding, or a desktop fan equipped with a stand, or a floor fan equipped with a telescopic stand. Correspondingly, the retaining member 19 can be a clip, a bending shaping member, a stand, or a telescopic stand, and is not limited thereto. A semiconductor cooling element (not shown, the same below) can be provided on the handle. The user can carry the portable bladeless fan 100 with them, and the semiconductor cooling element can automatically adjust the cooling temperature according to the temperature of the part in contact with the user, 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 cooling component is provided on the handle to improve 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 warmth, and a warming component (not shown) can be provided on the 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 improve the user's carrying comfort.

[0032] Combination Figure 3 and Figure 4 In this embodiment, the handle can house a battery (not labeled, the same below), and the handle may have an exposed switch button (not labeled, the same below) and a charging port (not shown, the same below). The battery powers the portable bladeless fan 100, the switch button is used to adjust the fan speed and turn the fan on / off, and the charging port is used to charge the battery with an external power source. When the portable bladeless fan 100 is a different type of fan (such as the aforementioned clip-on fan, multi-functional fan, desktop fan, etc.), the positions of the battery, switch button, and charging port can be adjusted accordingly. Of course, for a thinner and lighter design, the portable bladeless fan 100 may not have a battery inside, and can still be portable by connecting to an external power source via an interface (not shown).

[0033] refer to Figures 1 to 4The portable bladeless fan 100 includes a housing 1, a pressurizing component 3, a mixed-flow fan 2, and an air-exhausting component 4. The radial cross-sectional outlines of the housing 1, the pressurizing component 3, the mixed-flow fan 2, and the air-exhausting component 4 are all generally circular. Of course, the housing 1, the pressurizing component 3, the mixed-flow fan 2, and the air-exhausting component 4 can also be other shapes, and are not limited thereto. The pressurizing component 3 is connected to the front side of the housing 1, and the pressurizing component 3 and the housing 1 are integrally formed. Of course, the pressurizing component 3 and the housing 1 can also be separately formed, and the pressurizing component 3 is installed on the housing 1, and are not limited thereto. The mixed-flow fan 2 is connected to the rear side of the pressurizing component 3 and is located inside the housing 1. The mixed-flow fan 2 rotates around the rotating shaft 24 to generate airflow. In this embodiment, the air-guiding component 4 is used to fix the portable bladeless fan 100 to an external object. However, the function of the air-guiding component 4 is not limited to this. The air-guiding component 4 is detachably fixed to the front end of the pressure-pressurizing component 3. The fixing method between the air-guiding component 4 and the pressure-pressurizing component 3 can be a snap-fit, suction, etc., and is not limited thereto. When it is not necessary to fix the portable bladeless fan 100 to an external object, the air-guiding component 4 is fixed to the front end of the pressure-pressurizing component 3, and the air-guiding component 4 can be carried along with the portable bladeless fan 100. When it is necessary to fix the portable bladeless fan 100 to an external object, the fixing component can be removed from the front end of the pressure-pressurizing component 3. This avoids the possibility of the air-guiding component 4 being lost or misplaced, and meets the normal and stable use requirements of users in various usage scenarios. The air inlet R of the portable bladeless fan 100 is located at the rear end, and the air outlet F is located at the front end. The direction of extension perpendicular to and passing through the rotating shaft 24 is radial, and the direction parallel to the rotating shaft 24 is axial.

[0034] refer to Figure 3 , Figure 4 , Figure 5 and Figure 7The diameter of the maximum radial section of the housing 1 is 2-2.2 times the length of the front and rear ends of the housing 1, so as to make the portable bladeless fan 100 thinner and lighter. Compared with the extremely small air outlet surface of existing handheld fans on the market, the portable bladeless fan 100 of this application has a larger air outlet area while ensuring air volume and air pressure. When the user uses it (e.g., handheld or standing on a flat surface), at the same distance, the air blown by the portable bladeless fan 100 of this application can reach more parts of the user, resulting in better air blowing effect. An air inlet plate 13 is provided on the rear side of the housing 1, and a first air inlet 14 is provided on the air inlet plate 13. The pressurizing member 3 is connected to the front side of the housing 1. The pressurizing member 3 and the housing 1 form a first air outlet 15 in the radial direction near the air outlet end F. The first air inlet 14 and the first air outlet 15 are connected inside the housing 1. A cover plate 16 is fixed to the rear side of the air intake plate 13. The cover plate 16 has an air hole 161, the size of which is smaller than the size of the first air intake part 14, to prevent fingers or other foreign objects from entering the housing 1 through the first air intake part 14, thus improving safety. There is a distance between the cover plate 16 and the air intake plate 13, and 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 rearward. This increases the radial air intake path between the air intake plate 13 and the cover plate 16, even with the smaller size of the air hole 161 on the cover plate 16. Since the first air intake part 14 is relatively large, the airflow is not affected by the smaller size of the cover plate 16 with the smaller air hole 161. The housing 1 is further divided into a first housing 11 and a second housing 12 that fit together front and rear. The first housing 11 and the second housing 12 are fixed to each other by a fixing structure. The mixing fan 2 is radially and is basically disposed within the first housing 11, and the pressure-applying component 3 is radially and is basically disposed within the second housing 12. The ratio of the length of the front and rear ends of the first housing 11 to the length of the front and rear ends of the second housing 12 is 1-1.5, which can reasonably balance the relationship between air volume and air pressure while achieving a thin and light design.

[0035] refer to Figure 3 , Figure 5 , Figure 8 and Figure 9The mixed-flow fan 2 includes a rotating base 21 and multiple blades 22. The rotating base 21 includes a guide surface 211 that increases radially from the air inlet end R to the air outlet end F. The multiple blades 22 are connected and equidistantly arranged on the guide surface 211. Each blade includes a blade root 221 connected to the guide surface 211 and a blade tip 222 away from the guide surface 211. The blades 22 extend spirally from the air inlet end R to the air outlet end F and along the circumference of the guide surface 211 at a predetermined angle. 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 beneficial for increasing the air intake volume. (Refer to reference) Figure 3 The rotating base 21 is approximately truncated cone-shaped. The radial cross-sectional area of ​​the rotating base 21 at the air inlet R is smaller than that at the air outlet F. The rotating base 21 has a relatively large radial cross-section at the air outlet F. The rotating base 21 is recessed at the air outlet F towards the air inlet R to form a receiving portion 23. The receiving portion 23 is used to accommodate components such as the motor. The motor used in the mixed-flow fan 2 is an external rotor brushless motor 25 with a service life of up to 15,000 hours. It eliminates the electrical sparks generated during the operation of a brushed motor, greatly reducing interference from electrical sparks to remote control wireless equipment. The brushless operation significantly reduces friction, resulting in smooth operation and good noise reduction. Furthermore, the connection structure between the mixed-flow fan 2 and the pressure member 3 is also accommodated in the receiving portion 23, making excellent use of space. The rotating shaft 24 protrudes forward from the rear wall of the receiving portion 23, and the rear side of the pressure member 3 protrudes backward to form a protruding post 33. The rotating shaft 24 is fixed to the protruding post 33. Meanwhile, the external rotor brushless motor 25 is housed in the receiving portion 23 of the rotating seat 21, so as to achieve independent isolation between the rotating seat 21 and the pressure member 3.

[0036] refer to Figure 3 , Figure 5 and Figure 7 The air intake plate 13 and the rear end of the rotating base 21 have a safe pressure distance D1 to allow the air intake plate 13 to undergo maximum compressive deformation within the pressure range permitted by the material properties. The distance between the air intake plate 13 and the rear end of the rotating base 21 is 4.0-4.5 mm (millimeters, the same below) to provide space at the air intake end R for a large air volume to enter, and also to allow the air intake plate 13 to undergo maximum compressive deformation when subjected to a large air volume. (Refer to 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 seat 21 to ensure sufficient air intake and achieve noise reduction, converting 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 tip 222 at the air intake end R, so that a larger wind pressure begins to form at the air intake window 2221 formed by the blade tip 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 seat 21 is 15.5 mm, but these are not limitations. Furthermore, 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 F. The first air intake portion 14 on the air intake plate 13 is blocked by the pressure seat 31 on the front side. During use, the first air intake portion 14 is not visible from front to back. That is, the light from the first air intake portion 14 will not be projected from the rear to the front, thereby reducing the impact of the rotation of the mixed-flow fan 2 on the human eye. At the air intake end R, the blade tip 222 is closer to the air intake plate 13 than the blade root 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 air guide surface 211 is recessed towards the rotating shaft 24, and the air guide surface 211 is oriented at an angle to the rotating shaft 24 to define an inclined flow path. This allows the axial airflow entering from the air inlet R, close to the rotating shaft 24, to be changed into axial or inclined airflow relatively away from the rotating shaft 24 after passing through the inclined flow path. This helps to reduce airflow loss and increase air pressure and delivery distance. It should be understood that at least a portion of the air guide surface 211 can be recessed towards the rotating shaft 24 so that the mixed-flow fan 2 concentrates and expands the airflow and forms high air pressure, thereby reducing noise and wind noise from the external rotor brushless motor 25 and converting sharp noise into low-pitched sound. Of course, the air guide surface 211 can also be an inclined plane, or at least a portion can protrude away from the rotating shaft 24, and this is not a limitation.

[0038] refer to Figure 3 , Figure 5 , Figure 6 and Figure 7The pressurizing component 3 includes a pressurizing base 31 and a plurality of connecting members 32. The pressurizing base 31 includes a pressurizing surface 311 that increases radially from the air inlet end R to the air outlet end F. The plurality of connecting members 32 are connected 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 connecting members 32 are already connected to the housing 1, the other connecting members 32 may not be connected to the housing 1. Excluding the portion of the connector 32 that forms the hollow negative pressure channel S, the other connectors 32 include a guide surface 323. This guide surface 323 is close to the blade 22. Viewed from back to front, the connector 32 extends forward at an angle counterclockwise. The oblique airflow generated by the mixed-flow fan 2 passes through the guide surface 323 and forms a direct current airflow parallel to the rotating shaft 24, increasing the blowing distance and rapidly pressurizing the airflow generated by the mixed-flow fan 2. The connecting top 322 connects to the housing 1, and the rotating seat 21 is connected to the pressure seat 31 via a fixed fitting structure. The mixed-flow fan 2 is relatively fixed within the housing 1 by the pressure member 3. The radius of the maximum diameter of the pressure member 3 at the air outlet F is 28-35 mm, expanding the blowing area while ensuring sufficient airflow and pressure.

[0039] Simultaneously, the connector 32 streamlines and transforms the passing air, reducing turbulence, noise, and vibration. It also reduces noise generated by turbulent crosstalk, achieving noise reduction by converting sharp noise into a low-pitched sound. Furthermore, it significantly increases static pressure and reduces energy consumption, enhancing the concentration of airflow from the mixed-flow fan 2. The connector 32 evens out the airflow generated by the mixed-flow fan 2 and increases the air pressure. The top of the connector 322 connects to the housing 1, and the line connecting the front and rear ends of the root of the connector 321 and the line connecting the front and rear ends of the top of the connector 322 forms an acute angle. This means that the housing 1 and the pressurizing surface 311 extend forward while moving closer to each other, allowing the air to be pressurized and expelled from the gap between the housing 1 and the pressurizing surface 311, which helps to increase the wind force and the air delivery distance.

[0040] refer to Figures 4 to 7The pressurizing seat 31 is also approximately truncated cone-shaped. The minimum radial cross-sectional area of ​​the pressurizing seat 31 is greater 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 R is smaller than the radial cross-sectional area of ​​the pressurizing seat 31 at the air outlet F. The pressurizing seat 31 has a relatively large radial cross-section at the air outlet F. The pressurizing seat 31 is recessed rearward at the air outlet F to form a cavity 34. At the same time, the pressurizing seat 31 and the housing 1 form the first air outlet 15 at the air outlet F. The first air outlet 15 is located radially outside the cavity 34. The area inside the cavity 34 forms a first high negative pressure zone A. In this embodiment, a cover 35 with a through hole 351 is also provided inside the cavity 34. Of course, in other embodiments, the cover 35 may not be provided. The pressure seat 31 has a large radial cross section at the air outlet F. Air is pressurized and discharged from the gap between the pressure seat 31 and the housing 1 at the air outlet F, which is beneficial to realize the reuse of the negative pressure guiding function and the pressurizing function of the pressure 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 located radially outward of the housing 1, and the second air outlet 18 is located radially inward of the pressurizing base 31 and radially inward of the first air outlet 15. In this embodiment, the second air outlet 18 is located radially inward of the cavity 34. The negative pressure channel S connects the second air inlet 17 and the second air outlet 18, so that while ensuring that the pressurized mixed flow is discharged from the first air outlet 15, the airflow is continuously replenished to the first high negative pressure zone A through the airflow guide by the negative pressure channel S, thereby reducing the airflow pulling and interference of the pressurized mixed flow, stabilizing the airflow and increasing the air volume and delivery distance. Of course, in other embodiments, the second air outlet 18 may also be located simultaneously on the radially inner side of the pressurizing seat 31 and the front side of a portion of the connecting member 32, and on the radially inner side of the first air outlet 15 and on 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, so as to achieve negative pressure air guiding and circumferential air supply based on the pressurized mixed flow in the housing 1 on the radial direction of the first air outlet 15. Alternatively, it may only be located on the front side 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 pressurizing surface 311 increases radially from the air inlet end R to the air outlet end F, and at the same time, at least a portion of the pressurizing surface 311 is recessed towards the rotating shaft. Specifically, the pressurizing surface 311 first increases radially from the air inlet end R to the air outlet end F, and then extends forward parallel to the rotating shaft 24. Of course, in other embodiments, the pressurizing surface 311 may also first extend forward parallel to the rotating shaft 24 from the air inlet end R to the air outlet end F, and then increase radially, or increase radially overall, or remain unchanged overall, or decrease radially at least partially, and is not limited thereto. The cavity 34 has a circular radial cross-section and includes a rear end face 341 and a radially connected peripheral wall 342. Axially, the end face 341 is located behind the first air outlet 15 to form the first high negative pressure zone A. The second air outlet 18 is located radially inside the peripheral wall 342 to shorten the length of the negative pressure channel S. Although a cover 35 is provided in this embodiment, a through hole 351 is provided on the cover 35. The through hole 351 communicates with the second air outlet 18, and the through hole 351 is at least partially aligned with the second air outlet 18. Therefore, the second air outlet 18 can still continuously provide negative pressure ventilation to the first high negative pressure zone 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 pressurized surface 311, the peripheral wall 342 first increases radially forward from the end face 341, and then extends forward parallel to the rotating shaft 24 to facilitate the fixing and disassembly of the air-guiding component 4. Of course, the peripheral wall 342 can also increase radially forward from the end face 341 as a whole, or the peripheral wall 342 can also extend forward parallel to the rotating shaft 24 from the end face 341, and then increase radially forward; it is not limited to this.

[0043] refer to Figures 4 to 7The air-guiding component 4 includes a base 41 and a fixing portion 42 protruding from the surface of the base 41. The fixing portion 42 is used to fix the portable bladeless fan 100. The base 41 includes a central portion 411 and an edge portion 412 connecting the central portion. The edge portion 412 bends and extends from the central portion 411 in the opposite direction to the protruding direction of the fixing portion 42. The central portion 411 matches the end face 341, and the edge portion 412 matches the peripheral wall 342. That is, the shape of the air-guiding component 4 matches the shape of the cavity 34 to form a second high negative pressure zone B, so that the air-guiding component 4 is entirely housed in the cavity 34. Furthermore, because the first air outlet 15 is located radially outside the cavity 34, the air outlet effect is equivalent in both the state where the portable bladeless fan 100 is fixed to an external object and the state where it is housed in the cavity 34, achieved through the second high negative pressure zone B. The air-guiding component 4 is provided with a corresponding ventilation port 43, which is connected to the second air outlet 18. On the basis of ensuring that the first air outlet 15 discharges the pressurized mixed flow, the air is continuously replenished to the second high negative pressure zone B through the negative pressure channel S, thereby reducing the airflow pulling and interference of the pressurized mixed flow, making the air outlet stable and increasing the air volume and air delivery distance. This achieves the same air outlet effect in both the state where the portable bladeless fan 100 is fixed to an external object and the state where it is housed in the cavity 34.

[0044] In this embodiment, the central portion 411 and the edge portion 412 form a semi-open receiving portion 413. The receiving portion 413 is used for a replaceable device 414, which is used to house an IP character item (not shown, the same below). The device 414 and the IP character item are integrally housed within the receiving portion 413. That is, when the air guide 4 is fixed within the cavity 34, the IP character item will not protrude forward from the receiving portion 413; when the air guide 4 is fixed to the retaining member 19, combined with... Figure 1 The IP image item faces external objects without protruding, thus achieving the reuse of the fixing and decorative functions of the air-guiding component 4. The device 414 can also be decorated with other totems, colors, or other possible decorations or combinations. Of course, in other embodiments, the receiving portion 413 can also be used to store a USB cable harness (not shown, the same below), with the entire USB cable harness housed within the receiving portion 413, thus achieving the reuse of the fixing and storage functions of the air-guiding component 4; the receiving portion 413 can also be used to store a spray component (not shown, the same below), with the entire spray component housed within the receiving portion 413, thus achieving the reuse of the fixing and humidifying functions of the air-guiding component 4. Specifically, the receiving portion 413 can also be used to house aromatherapy, mirrors, and other components, thus achieving the multi-functional reuse of the air-guiding component 4.

[0045] refer to Figures 4 to 7 The device 414 is correspondingly disposed in the central part 411. The central part 411 is provided with a ventilation port 43 that communicates with the second air outlet 18 near the edge part 412 and / or the edge part 412 is provided with a corresponding ventilation port 43. There is a gap between the ventilation port 43 and the device 414 so as to realize the reuse of the air guide 4's fixing function, storage function and negative pressure air guiding function. Furthermore, due to the through hole 351, the through hole 351 on the cover 35 is at least partially aligned with the second air outlet 18, and the fixing part 42 protrudes from the surface of the seat 41. Therefore, the fixing part 42 creates a gap between the seat 41 and the cover 35. Of course, there can also be a gap between the seat 41 and the cover 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 to achieve communication between the vent 43 and the through hole 351. 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 Figure 1 When the fixing part 42 cooperates with the retaining member 19, the portable bladeless fan 100 is fixed to the external plane. The maximum radial cross-sectional area of ​​the base 41 is larger than the cross-sectional area of ​​the retaining member 19, so as to secure the portable bladeless fan 100 to the external plane. Specifically, in this embodiment, the retaining member 19 is the handle, and the shape of the fixing part 42 matches the shape of the bottom of the handle. When the air guide 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 base 41 may be provided with suction cups or other adsorption components to adsorb the portable bladeless fan 100 onto external objects; or, the base 41 may be provided with hooks or hanging ropes or other hanging components to hang the portable bladeless fan on external objects.

[0047] refer to Figure 3 , Figure 5 and Figure 7The pressurizing component 3 and the mixed-flow fan 2 together form a pressurized flow channel T with the housing 1. The radial cross-sectional area of ​​the pressurized flow channel T at the air inlet R is larger than that at the air outlet F. Air enters the pressurized flow channel T from the first air inlet 14, forms a pressurized mixed flow in the pressurized flow channel T, and then exits from the first air outlet 15. Air enters the mixed-flow fan 2 axially from the air inlet R and exits from the air outlet F. The mixed-flow fan 2 combines the advantages of a large air volume of an axial flow fan and the high air pressure of a centrifugal fan. Simultaneously, the pressurized flow channel T formed between the mixed-flow fan 2, the pressurizing component 3, and the housing 1 has a large radial cross-sectional area at the air inlet R, which is beneficial for absorbing air and increasing air volume; and a small radial cross-sectional area at the air outlet F, which is beneficial for compressing air and increasing air pressure. The oblique airflow characteristic of the mixed-flow fan 2 further increases the air pressure and the air delivery distance, thereby achieving large air volume and high air pressure in the relatively small portable bladeless fan 100, achieving rapid cooling and improving the user experience.

[0048] refer to Figures 5 to 7 The mixing fan 2 and the pressurizing component 3 are arranged close to each other in the axial direction, that is, the rotating seat 21 and the pressurizing seat 31 are arranged close to each other in the axial direction. At the same time, the radial cross-section of the rotating seat 21 at the air outlet F and the radial cross-section of the pressurizing seat 31 at the air inlet R are both circular, and the difference between their radii is very small. In this embodiment, the difference between their radii is less than 2 mm. Of course, this is not a limitation, as long as the pressurizing surface 311 and the air guiding surface 211 are also arranged close to each other in the axial direction to block the wind from entering. The equivalent seamless connection interval D2 between the rotating seat 21 and the pressurizing seat 31 prevents airflow that would otherwise be blocked from entering this interval. Instead, the airflow generated by the mixing fan 2 at the rear is blown directly forward, allowing the air to flow more smoothly from the portion of the pressurizing guide channel T between the air guide surface 211 and the housing 1 into the portion of the pressurizing guide channel T between the pressurizing surface 311 and the housing 1. This reduces eddy current losses and minimizes turbulent crosstalk noise. Specifically, the equivalent seamless connection interval D2 between the rotating seat 21 and the pressurizing seat 31 in the axial direction is 1-1.5 mm to ensure that the airflow generated by the mixing fan 2 flows smoothly to the pressurizing component 3. However, this is not a limitation; any measure that reduces the amount of airflow entering the equivalent seamless connection interval D2 between the rotating seat 21 and the pressurizing seat 31 is acceptable.

[0049] refer to Figure 6The air guide surface 211 includes a first extension 2111 adjacent to one end of the pressurizing surface 311, and the pressurizing surface 311 includes a second extension 312 adjacent to one end of the air guide surface 211. The first extension 2111 and the second extension 312 extend in the same direction, so as to make the connection between the air guide surface 211 and the pressurizing surface 311 smoother.

[0050] refer to Figure 7 The blades 22 and the connectors 32 are axially adjacent and spaced apart to form an equivalent partition gap D3. The minimum equivalent partition gap D3 between the blades 22 and the connectors 32 is 1-1.5mm. This is to prevent the airflow generated by the mixed-flow fan 2 at the outlet F from flowing back to the inlet R along the gap between the blades 22 and the connectors 32, and to prevent crossflow between adjacent connectors 32, thereby streamlining the airflow and increasing air pressure, achieving the effects of air guidance and noise reduction. 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 space between the connectors 32, reducing backflow loss.

[0051] Reference Figure 3 , Figure 7 and Figure 9 Viewed from back to front, the blade 22 connects to the air guide surface 211 and extends forward at an angle in a clockwise direction. A portion of the connector 32 connects to the pressurizing surface 311 and extends forward at an angle in a counter-clockwise direction. The line connecting the front and rear ends of the blade 22 to the air guide surface 211 forms an angle with the line connecting the front and rear ends of the connector 32 to the pressurizing surface 311, thereby increasing wind pressure. Furthermore, the curvature of a portion of the connector 32 is greater than the curvature of the blade 22, further increasing wind pressure. However, the curvature of the blade 22 and a portion of the connector 32 is not limited to this.

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

[0053] refer to Figure 5 and Figure 6From the air inlet R to the air outlet F, the mixing fan 2 and the pressurizing base 31 are radially enlarged to form a trumpet shape, creating an outwardly expanding pressurizing slope M. Specifically, the rotating base 21 and the pressurizing base 31 are radially enlarged to form a trumpet shape, creating an outwardly expanding pressurizing slope M. The pressurizing slope M increases the pressurization stroke of the airflow. The pressurizing slope M includes the air guide surface 211 and the pressurizing surface 311, providing two-stage pressurization with increased pressurization strokes in both stages, resulting in a better pressurization effect.

[0054] refer to Figures 4 to 7The axial lengths of the front and rear ends of the rotating base 21 are 0.8-1 or 1-1.5 times the axial lengths of the front and rear ends of the pressurizing base 31. This ensures that after the airflow is compressed under high pressure by the blades 22, it is effectively combed through the connecting member 32, ensuring the maximum usable airflow constructed by the high-pressure airflow generated by the pressurizing member 3 and the external negative pressure airflow, as well as the aggregated air delivery distance of the maximum usable airflow. It should be understood that the high air pressure of the final airflow generated by the pressurizing member 3 can drive the negative pressure air near the outside of the housing 1, thereby further increasing the airflow. Preferably, the axial lengths of the front and rear ends of the mixed-flow fan 2 and the pressurizing member 3 are in a 1:1 ratio, which can meet the high airflow requirements of the portable bladeless fan 100 in various usage scenarios, and also makes the product thinner and lighter; and the 1:1 ratio makes it more aesthetically pleasing for handheld use. The pressurizing component 3 is provided with a cavity 34 at the air outlet F for receiving the air duct 4. When the axial length of the front and rear ends of the pressurizing seat 31 is limited, the difference between the depth value of the cavity 34 and the length value of the pressurizing component 3 from the air inlet R to the air outlet 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 of the pressurizing component 3 at the air outlet F is less than a second difference value, so as to realize the reuse of the pressurizing component 3 in pressurizing function and containing function. Furthermore, given the limited thickness of the rotating seat 21 and the pressurizing seat 31, the outward expansion of the pressurizing ramp M allows the radius of the end face 341 of the cavity 34 adjacent to the rotating seat 21 to be less than the radius of the radial section of the housing 1 at the air outlet F. This increases the accommodating space of the cavity 34 for accommodating the air-guiding component 4 by increasing the radial cross-sectional area of ​​the end face 341 of the cavity 34 adjacent to the rotating seat 21, even when the depth of the cavity 34 is limited. The first and second difference values ​​are both 1.3-1.7 mm, and the third difference value is 6.2-6.8 mm. This ensures that the cavity 34 has sufficient radial space to accommodate the air-guiding component 4 and sufficient space to form the first high negative pressure zone A, while simultaneously ensuring that the airflow is pressurized and discharged from the gap formed between the pressurizing ramp M and the housing 1 at the air outlet F. Of course, in other embodiments, the first difference value, the second difference value, and the third difference value can be adjusted to other values, as long as the containment function and the pressurization function of the pressurizing component 3 can be balanced.

[0055] refer to Figures 5 to 7The pressurizing inclined surface M and the housing 1 form the pressurizing guide channel T. The pressurizing inclined surface M includes the air guide surface 211 and the pressurizing surface 311. The cooperation between the pressurizing inclined surface M and the housing 1 achieves noise reduction, converting sharp noise into low-pitched sound. The pressurizing guide channel T includes a first channel T1 and a second channel T2 connected to each other. The first channel T1 is formed radially between the air guide surface 211 of the mixed-flow fan 2 and the first housing 11, and the second channel T2 is formed radially between the pressurizing surface 311 of the pressurizing seat 31 and the second housing 12. 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 drainage surface 111 facing the air guide surface 211. Both the air guide surface 211 and the first drainage surface 111 are annular. At least a portion of the air guide surface 211 is radially concave to form a concave surface. The first drainage surface 111 increases radially from the air inlet end R to the air outlet end F, and at least a portion of the first drainage surface 111 is radially convex to form a convex surface, so that the structure of the first channel T1 can concentrate and form a large air volume while being pressurized. Of course, this is only one form of the air guide surface 211 and the first drainage surface 111, and is not a limitation thereof.

[0057] refer to Figures 5 to 7 In the radial direction, the second housing 12 includes a second airflow guiding surface 121 facing the pressurizing surface 311. Both the pressurizing surface 311 and the second airflow guiding surface 121 are annular. At least a portion of the pressurizing surface 311 is radially enlarged and radially concave to form a concave surface. The second airflow guiding surface 121 is radially reduced from the air inlet end R to the air outlet end F, and at least a portion of the second airflow guiding surface 121 is radially convex to form a convex surface. This allows the structure of the second channel T2 to further and rapidly pressurize the large volume and high pressure airflow generated behind it to form high pressure airflow. Of course, this is only one form of the pressurizing surface 311 and the second airflow guiding surface 121, and is not a limitation thereof.

[0058] Both the first air-guiding surface 111 and the second air-guiding surface 121 are radially protruding convex surfaces. Furthermore, the first air-guiding surface 111 and the second air-guiding surface 121 form a smooth and complete arc surface by first increasing radially and then decreasing radially from the air inlet end R to the air outlet end F. The first air-guiding surface 111 and the second air-guiding surface 121 not only increase air volume and air pressure but also improve the aesthetics of the housing 1. The radial distance between the second air-guiding surface 121 at the air outlet end F and the rotating shaft 24 is greater than the radial distance between the first air-guiding surface 111 at the air inlet end R and the rotating shaft 24. This facilitates blowing the airflow from the rotating shaft 24, which is closer to the center, towards a position radially away from the rotating shaft 24, thereby increasing the air delivery distance.

[0059] refer to Figures 4 to 6 The axial airflow at the air inlet R is redirected to flow obliquely forward along the air guide surface 211, causing the airflow closer to the axial direction to flow obliquely outward. The oblique airflow at the air outlet F of the mixed-flow fan 2 is redirected to flow obliquely forward along the pressurizing surface 311, and further obliquely outward, to provide sufficient space near the axis of the pressurizing component 3, enough space to accommodate the air intake component 4. The line connecting the front and rear ends of the air guide surface 211 forms a first angle α with the rotating shaft 24, and the line connecting the front and rear ends of the pressurizing surface 311 forms a second angle b with the rotating shaft 24. The first angle α is greater than the second angle b, to increase air pressure while reducing airflow loss. The range of the first angle α 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 concave towards the rotating shaft 24, and the axial airflow at the air inlet R flows along the air guide surface 211 with a rapidly increasing slope for rapid pressurization. The pressurizing surface 311 first increases radially from the air inlet R to the air outlet F, then remains constant radially. Both the radially increasing and radially constant portions of the pressurizing surface 311 are planar. The airflow generated by the mixed-flow fan 2 is pressurized a second time along the gradually decreasing slope of the pressurizing surface 311. The airflow, through the rapid pressurization of the air guide surface 211 and the secondary pressurization of the pressurizing surface 311, forms high-pressure air, resulting in good airflow performance and a long air delivery distance for the portable bladeless fan 100. At the same time, the two inclined sections also have the effects of airflow guidance and noise reduction.

[0060] refer to Figure 5 , Figure 7 and Figure 8 From the air inlet R to the air outlet F, at least a portion of the air guide surface 211 is recessed toward the rotating shaft 24, so that the mixing fan 2 concentrates airflow and forms a first high air pressure; as Figure 4 Viewed from left to right, the distance between the blade tip 222 and the radial gap of the housing 1 decreases from the air inlet R to the air outlet F, but combined with... Figure 8 The distance between the blade tip 222 and the housing 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 F from flowing back to the mixed flow fan 2 at the air inlet R around the minimum radial gap, 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 R to the air outlet F to increase the third high wind pressure; the connector 32 equalizes the airflow formed by the mixed flow fan 2 and increases the fourth high wind pressure.

[0061] The first high air pressure is formed on the basis of the large air volume gathered at the air inlet R, and the second, third and fourth high air pressures are increased at the same time. The mixed flow fan 2 has the ability to form a large air volume and high air pressure, so as to generate a large air volume and high air pressure in the small portable bladeless fan 100, and increase the air delivery distance, which perfectly meets the needs of users.

[0062] Because the portable bladeless fan 100 has a delicate and compact structure, the sheet metal is thin and the structure is fragile. During the research and development process, even slight adjustments to each structure, angle, curvature, aperture, and duct length can significantly alter the product's airflow, air pressure, and noise. Moreover, during mass production, difficulties in demolding may arise, or complex and costly processes may be required. This is on a completely different level of difficulty compared to Dyson's large-scale products. Therefore, even Dyson has not developed related products or patented technologies, let alone other companies with limited R&D capabilities that have developed and produced related products and patents. Due to these reasons, the applicant has conducted hundreds or even thousands of combinations of at least five variables—structure, angle, curvature, aperture, and duct length—through extensive prototyping, experimentation, and testing to obtain a relatively optimal parameter combination for the structure, angle, curvature, aperture, and duct length in this application. This achieves a balance in airflow, air pressure, and noise, with the ultimate goal of providing the best user experience, resulting in a revolutionary product.

[0063] The above detailed description is only an illustration of a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Therefore, all equivalent technical changes made using the content of this invention's specification and illustrations are included within the patent scope of this invention.

Claims

1. A portable bladeless fan, characterized in that, include: The housing has a first air inlet and a first air outlet, which are connected within the housing. A pressurizing component is connected to the front side of the housing. The pressurizing component includes a pressurizing base, and the pressurizing base and the housing form the first air outlet at the air outlet end. A mixed-flow fan is located inside the housing, and the mixed-flow fan rotates about a pivot to generate airflow; The area formed by the rearward recess of the pressurizing seat at the air outlet is the first high negative pressure zone.

2. The portable bladeless fan as described in claim 1, characterized in that: The pressurizing seat is recessed at the air outlet to form a cavity, and the area within the cavity forms the first high negative pressure zone.

3. The portable bladeless fan as described in claim 1, characterized in that: The pressurizing seat has a cover at the air outlet end, and the area formed by the rearward recess of the cover is the first high negative pressure zone.

4. The portable bladeless fan as described in claim 1, characterized in that: The pressurizing seat is recessed at the air outlet to form a cavity, and the opening end of the cavity is provided with a cover. The area formed by the recessed cover is the first high negative pressure zone.

5. The portable bladeless fan as described in claim 2, characterized in that: It also includes a draft member housed in the cavity, the shape of which matches the shape of the cavity to form a second high negative pressure zone.

6. The portable bladeless fan as described in claim 2, 4, or 5, characterized in that: The cavity includes an end face and a peripheral wall surrounding the end face, with the end face located axially behind the air outlet end of the first air outlet.

7. The portable bladeless fan as described in claim 6, characterized in that: The peripheral wall includes an inner surface that at least partially increases radially from the air inlet end to the air outlet end.

8. The portable bladeless fan as described in claim 5, characterized in that: The cavity includes an end face and a peripheral wall surrounding the end face; the air guide includes a central portion and an edge portion, the edge portion bends and extends from the central portion in a direction away from the cavity, the central portion matches the end face, and the edge portion matches the peripheral wall.

9. The portable bladeless fan as described in claim 1, characterized in that: The pressurizing component has a negative pressure channel that guides air from the radially outer side of the housing to the radially inner side of the housing; the pressurizing component also includes a plurality of connectors that connect the outer circumference of the pressurizing base and the inner circumference of the housing, at least some of the connectors are connected to the housing and are hollow to form the negative pressure channel.

10. The portable bladeless fan as described in claim 9, characterized in that: It also includes a second air inlet and a second air outlet. The second air inlet is located on the radially outer side of the housing, and the second air outlet is located on the radially inner side of the pressurizing seat and the front side of the connector, and is located radially inner to the first air outlet and radially above the first air outlet. The negative pressure channel connects the second air inlet and the second air outlet.

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