Portable bladeless fan

Abstract

The invention provides a portable bladeless fan. Comprising a shell; the pressurizing piece is connected with the front side of the shell; the pressurizing piece comprises a pressurizing seat which is radially enlarged from the air inlet end to the air outlet end, and a containing cavity is formed in the air outlet end of the pressurizing seat in a backward concave mode; 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; the air inducing piece is contained in the containing cavity, the shape of the air inducing piece is matched with the shape of the containing cavity to form a second high negative pressure area, and the air inducing piece is used for arranging a device. The air volume and the air supply distance are increased.

Description

[0001] This application claims priority to Chinese Patent Application No. 202122350626.3, filed on September 27, 2021, the entire contents of which are incorporated herein by reference.

[0002] This application is a divisional application. The original application has the application number 202111518220.X and the original application title is "Portable Bladeless Fan". The original application date is December 10, 2021. The entire contents of the original application are incorporated herein by reference. Technical Field

[0003] This application relates to the field of air handling, and more particularly to portable bladeless fans. Background Technology

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] 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

[0009] This application provides a portable bladeless fan to solve the problem.

[0010] This application provides a portable bladeless fan, comprising:

[0011] case;

[0012] The pressure member is connected to the front side of the housing;

[0013] The pressurizing component includes a pressurizing seat that increases radially from the air inlet end to the air outlet end, and the pressurizing seat has a cavity recessed rearward at the air outlet end;

[0014] A mixed-flow fan is located inside the housing and connected to the rear side of the pressurizing member. The mixed-flow fan rotates around a pivot to generate airflow.

[0015] An air-guiding element is housed in the cavity, the shape of which matches the shape of the cavity to form a second high negative pressure zone, and the air-guiding element is used to house the device.

[0016] In some possible implementations, the air intake includes a central portion and an edge portion, the edge portion extending and bending away from the central portion in a direction away from the cavity.

[0017] In some possible implementations, the housing has a first air inlet on the rear side and a first air outlet on the front side, and the first air inlet and the first air outlet are connected inside the housing.

[0018] The cavity has a circular radial cross-section and 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.

[0019] 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.

[0020] In some possible implementations, a second air inlet and a second air outlet are also included; the second air inlet is located radially outward of the housing, and the second air outlet is located radially inward of the pressurizing seat and is located radially inward of the first air outlet.

[0021] The first air outlet is located radially outside the cavity, and the region 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.

[0022] In some possible implementations, the air intake is provided with a vent, which is connected to the second air outlet. The air is continuously supplied to the second high negative pressure zone through the negative pressure channel, thereby reducing the pulling and interference of pressurized mixed airflow, stabilizing the airflow and increasing the air volume and delivery distance.

[0023] In some possible implementations, the central portion and the edge portion form a semi-open receiving portion for a replaceable device.

[0024] In some possible implementations, the air intake element is used to provide a replaceable device;

[0025] The device is disposed at the center, and a ventilation opening is disposed at the center near the edge and / or at the edge, with a gap between the ventilation opening and the device.

[0026] In some possible implementations, from the air inlet to the air outlet, the mixing fan and the pressurizing base are radially enlarged to form a trumpet shape to create an outwardly expanding pressurizing ramp, which includes an air guide surface and a pressurizing surface.

[0027] In some possible implementations, the portable bladeless fan is configured such that the axial airflow at the air inlet is changed to flow obliquely forward along the air guide surface, so that the airflow closer to the axis flows obliquely outward.

[0028] The mixed-flow fan changes the tilted airflow at the outlet end to flow tilted forward along the pressurizing surface, and further tilted outward, so as to leave enough space in the part of the pressurizing component near the axis, which can be used to accommodate the air duct.

[0029] In some possible implementations, the line connecting the front and rear ends of the air guide forms a first angle with the rotating shaft, and the line connecting the front and rear ends of the pressurizing surface forms a second angle with the rotating shaft. The first angle is greater than the second angle, so as to increase air pressure while reducing air volume loss. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 This is a perspective view of the first state of the portable bladeless fan air intake component of the present invention;

[0032] Figure 2 This is a perspective view of the second state of the portable bladeless fan air duct of the present invention;

[0033] Figure 3 yes Figure 2 An exploded 3D view of a portable bladeless fan from one angle;

[0034] Figure 4 yes Figure 2 Another perspective of the exploded 3D view of a portable bladeless fan;

[0035] Figure 5 This is a partial cross-sectional view of the portable bladeless fan of the present invention;

[0036] Figure 6 This is a schematic diagram of the portable bladeless fan rotating base and pressurizing base of the present invention;

[0037] Figure 7 This is a left view of the portable bladeless fan of the present invention with the casing transparently displayed;

[0038] Figure 8 This is a front-to-back sectional view of the portable bladeless fan of the present invention;

[0039] 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.

[0040] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] refer to Figure 1 and Figure 2 The 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, allowing the user to carry the portable bladeless fan 100 with them. At the same time, 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 corresponding handle to improve the user's carrying comfort; of course, by adding a heating element (not shown) to the portable bladeless fan 100, it can also be used for heat preservation and warmth. 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 improve the user's carrying comfort.

[0045] Combination Figure 3 and Figure 4In this embodiment, the handle can house a battery (not labeled, the same below), and the handle can 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 and 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, to achieve 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 through an interface (not shown).

[0046] refer to Figures 1 to 4 The portable bladeless fan 100 includes a housing 1, a pressurizing component 3, a mixed-flow fan 2, and an air-guiding component 4. The radial cross-sectional outlines of the housing 1, pressurizing component 3, mixed-flow fan 2, and air-guiding component 4 are generally circular. Of course, the housing 1, pressurizing component 3, mixed-flow fan 2, and air-guiding 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 is 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. Of course, the function of the air-guiding component 4 is not limited thereto. The air-guiding component 4 is detachably fixed to the front end of the pressurizing component 3. The fixing method between the air-guiding component 4 and the pressurizing component 3 can be a snap, suction, etc., and is not limited thereto. When the portable bladeless fan 100 does not need to be fixed to an external object, the air intake component 4 is fixed to the front end of the pressurizing component 3, and the air intake component 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 air intake component 4 can be removed from the front end of the pressurizing component 3. This avoids the possibility of the air intake 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 through the rotating shaft 24 is radial, and the direction parallel to the rotating shaft 24 is axial.

[0047] 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. A 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 section 14. This prevents fingers or other foreign objects from entering the housing 1 through the first air intake section 14, improving safety. There is a distance between the cover plate 16 and the air intake plate 13. At least a portion of the air intake plate 13 is recessed forward, and 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 with the smaller size of the air hole 161. Since the first air intake section 14 is relatively large, the airflow is not affected by the smaller air hole 161 on the cover plate 16. The housing 1 is further divided into a first housing 11 and a second housing 12 that fit together. The first housing 11 and the second housing 12 are fixed to each other by a fixing structure. The mixing fan 2 is radially positioned within the first housing 11, and the pressurizing component 3 is radially positioned within the second housing 12. The ratio of the lengths of the front and rear ends of the first housing 11 to the lengths of the front and rear ends of the second housing 12 is 1-1.5, which can achieve a reasonable balance between air volume and air pressure while achieving a thinner and lighter design.

[0048] refer to Figure 3 , Figure 5 , Figure 8 and Figure 9 The 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 ranges from 0.5 to 0.9, which is beneficial for increasing the air intake volume. (Refer to reference) Figure 3The rotating base 21 is roughly 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 from the air outlet F towards the air inlet R to form a receiving part 23, which 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 when the brushed motor is running, which can greatly reduce the interference of electrical sparks on remote control wireless equipment. The friction is greatly reduced when the brushless motor is running, resulting in smooth operation and good noise reduction. Furthermore, the connection structure between the mixed-flow fan 2 and the pressure component 3 is also accommodated in the receiving part 23, making excellent use of space. The rotating shaft 24 protrudes forward from the rear wall of the receiving part 23, and the rear side of the pressure component 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 to achieve independent isolation between the rotating seat 21 and the pressure member 3.

[0049] refer to Figure 3 , Figure 5 and Figure 7 A safe pressure distance D1 is provided between the air intake plate 13 and the rear end of the rotating base 21 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 9 The 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 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 at the air intake end R by the blade tip 222, so that a larger wind pressure begins to form at the air intake window 2221 formed at the air intake end R by the blade tip 222. 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 this is not a limitation. Additionally, 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 front pressure seat 31. 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, thus reducing the impact of the rotation of the mixed-flow fan 2 on the human eye. The top 222 of the R blade at the air inlet end is closer to the air inlet plate 13 than the root 221 of the blade, so as to enhance the suction capacity of the mixed flow fan 2.

[0050] refer to Figure 5 and Figure 6At 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 near 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 can concentrate and expand the airflow and form 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 it can be at least partially convex away from the rotating shaft 24, and is not limited thereto.

[0051] refer to Figure 3 , Figure 5 , Figure 6 and Figure 7 The pressurizing component 3 includes a pressurizing base 31 and multiple connectors 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 multiple connectors 32 are connected and equidistantly arranged on the pressurizing surface 311. Each connector 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 connectors 32 are connected to the housing 1 and are hollow to form a negative pressure channel S. In this embodiment, other connectors 32 are also connected to the housing 1. Of course, since some connectors 32 are already connected to the housing 1, other connectors 32 may not be connected to the housing 1. Excluding the hollow connecting piece 32 that forms the negative pressure channel S, the other connecting pieces 32 include a guide surface 323. The guide surface 323 is close to the blade 22. Viewed from back to front, the connecting piece 32 extends forward at an angle counterclockwise. The oblique airflow generated by the mixed-flow fan 2 passes through the guide surface 323 and then 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 top connecting piece 322 connects to the housing 1, and the rotating base 21 is connected to the pressure base 31 via a fixed fitting structure. The mixed-flow fan 2 is relatively fixed inside the housing 1 via the pressure member 3. The pressure member 3 has a radius of 28-35mm at its maximum diameter at the air outlet F, expanding the blowing area while ensuring sufficient airflow and pressure.

[0052] 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, reduces energy consumption, and enhances 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 connector 322 connects to the housing 1, and the line connecting the front and rear ends of the root connector 321 and the line connecting the front and rear ends of the top connector 322 forms an acute angle. This means that the housing 1 and the pressure surface 311 extend forward while moving closer to each other, allowing the air to be pressurized and discharged from the gap between the housing 1 and the pressure surface 311, which helps to increase the wind force and the air delivery distance.

[0053] refer to Figures 4 to 7 The pressure seat 31 is also roughly truncated cone-shaped. The minimum radial cross-sectional area of ​​the pressure seat 31 is greater than the maximum radial cross-sectional area of ​​the rotating seat 21. The radial cross-sectional area of ​​the pressure seat 31 at the air inlet R is smaller than the radial cross-sectional area of ​​the pressure seat 31 at the air outlet F. The pressure seat 31 has a relatively large radial cross-section at the air outlet F. The pressure seat 31 is recessed rearward at the air outlet F to form a cavity 34. At the same time, the pressure seat 31 and the housing 1 form a 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. The 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.

[0054] refer to Figure 3 , Figure 4 , Figure 5 and Figure 7The portable bladeless fan 100 also 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 pressurization 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 negative pressure channel S, thereby reducing the airflow pulling and interference of the pressurized mixed flow, making the airflow stable 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 part 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 replenishment 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 part of the connecting member 32 to achieve circumferential air replenishment.

[0055] refer to Figures 4 to 7 At least a portion of the pressurized surface 311 increases radially from the air inlet end R to the air outlet end F, while at least a portion of the pressurized surface 311 is concave towards the rotating shaft. Specifically, the pressurized 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 pressurized 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. The axial end face 341 is located behind the first air outlet 15 to form a 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 pressure seat 31. Corresponding to the pressure 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 intake 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 axis of rotation 24 from the end face 341 and then increase radially forward, without being limited by this.

[0056] refer to Figures 4 to 7 The 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 it to 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. Since the first air outlet 15 is located radially outside the cavity 34, the air outlet effect is equivalent in both the state where the air-guiding component 4 fixes the portable bladeless fan 100 to an external object and the state where it is housed in the cavity 34, through the second high negative pressure zone B. The air intake component 4 is provided with a ventilation port 43, which is connected to the second air outlet 18. On the basis of ensuring that the pressurized mixed flow is discharged from the first air outlet 15, the air intake component 4 continuously replenishes 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 air intake component 4 fixes the portable bladeless fan 100 to an external object and the state where it is housed in the cavity 34.

[0057] 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 housed together in the receiving portion 413. That is, when the air guide 4 is fixed inside 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-themed item faces external objects without protruding, thus achieving the reuse of the air-guiding component 4's fixing and decorative functions. The component 414 can also be decorated with other patterns, colors, or other possible combinations. 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 air-guiding component 4's fixing and storage functions; 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 air-guiding component 4's fixing and humidifying functions. 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.

[0058] refer to Figures 4 to 7The device 414 is correspondingly disposed in the center portion 411. The center portion 411 is provided with a ventilation port 43 connecting to the second air outlet 18 near the edge portion 412 and / or the edge portion 412 is provided with a corresponding ventilation port 43. There is a gap between the ventilation port 43 and the device 414 to realize the reuse of the functions of fixing the air guide 4, storing it and guiding negative pressure. Furthermore, since the through hole 351 is provided, 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 portion 41. Therefore, the fixing part 42 makes the seat portion 41 and the cover 35 have a gap. Of course, there can also be a gap between the seat portion 41 and the cover 35. Therefore, when the fixing air guide 4 is installed in the cavity 34, the ventilation port 43 does not need to be aligned with the through hole 351 to achieve communication between the ventilation port 43 and the through hole 351. When the fixing air guide 4 is rotated, the position of the ventilation port 43 can also be changed, thereby changing the air outlet position of the negative pressure guide.

[0059] 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 part 41 is larger than the cross-sectional area of ​​the retaining member 19, so as to stabilize the portable bladeless fan 100 on the external plane. Specifically, in this embodiment, the retaining member 19 is a 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 part 41 may be provided with a suction cup or other adsorption component to adsorb the portable bladeless fan 100 onto an external object; or, the base part 41 may be provided with a hook or hanging rope or other hanging component to hang the portable bladeless fan on an external object.

[0060] refer to Figure 3 , Figure 5 and Figure 7The pressurizing component 3 and the mixing fan 2 form a pressurized flow channel T between themselves and 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. After the air enters the mixing fan 2 axially from the air inlet R, it leaves from the air outlet F. The mixing fan 2 combines the advantages of the large air volume of an axial flow fan and the high air pressure of a centrifugal fan. At the same time, the pressurized flow channel T formed between the mixing fan 2, the pressurizing component 3, and the housing 1 has a large radial cross-sectional area at the air inlet R, which is conducive to absorbing air and increasing the air volume; and a small radial cross-sectional area at the air outlet F, which is conducive to compressing air and increasing the air pressure. The angled airflow of the mixed-flow fan 2 further increases the air pressure and extends the air delivery distance, thus achieving a large air volume and high air pressure in the relatively small portable bladeless fan 100, enabling rapid cooling and improving the user experience.

[0061] 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 2mm. Of course, this is not a limitation. As long as the pressurizing surface 311 and the air guide surface 211 are also arranged close to each other in the axial direction, so as to block the wind from entering the equivalent seamless connection gap D2 between the rotating seat 21 and the pressurizing seat 31, the wind blocked from entering the equivalent seamless connection gap D2 between the rotating seat 21 and the pressurizing seat 31 is blown directly towards the rear by the wind generated by the mixing fan 2, so as to continue to flow forward. This makes the wind more smoothly enter the part of the pressurizing guide channel T between the air guide surface 211 and the housing 1, reducing eddy current loss and reducing 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 1-1.5mm, so that the air generated by the mixed flow fan 2 can flow smoothly to the pressurizing component 3. Of course, this is not a limitation, as long as it can reduce the amount of air entering the equivalent seamless connection interval D2 between the rotating seat 21 and the pressurizing seat 31.

[0062] refer to Figure 6 The 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 that the connection between the air guide surface 211 and the pressurizing surface 311 is smoother.

[0063] refer to Figure 7The 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 to achieve 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 losses.

[0064] Reference Figure 3 , Figure 7 and Figure 9 Viewed from back to front, blade 22 connects to the air guide surface 211 and extends forward at a clockwise angle, while part of connector 32 connects to the pressurizing surface 311 and extends forward at a counterclockwise angle. The line connecting the front and rear ends of blade 22 to the air guide surface 211 and the line connecting the front and rear ends of part of connector 32 to the pressurizing surface 311 form an angle to increase wind pressure. Furthermore, the curvature of part of connector 32 is greater than that of blade 22 to further increase wind pressure. Of course, the curvature of blade 22 and part of connector 32 is not limited by this.

[0065] refer to Figure 3 and Figure 9 In this embodiment, there are 7 blades 22 and 8 connectors 32. 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.

[0066] refer to Figure 5 and Figure 6 From 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 ramp M. Specifically, the rotating base 21 and the pressurizing base 31 are radially enlarged to form a trumpet shape, creating an outwardly expanding pressurizing ramp M. The pressurizing ramp M increases the pressurization stroke of the airflow. The pressurizing ramp M includes a guide surface 211 and a pressurizing surface 311, providing two-stage pressurization with increased pressurization strokes in both stages, resulting in a better pressurization effect.

[0067] 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 pressure 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 from the pressure member 3 and the external negative pressure airflow, as well as the aggregation air delivery distance of the maximum usable airflow. It should be understood that the high air pressure of the final airflow generated by the pressure 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 pressure 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, conforming to the concept of symmetry. The pressurizing component 3 has a cavity 34 at the air outlet F for accommodating the air-guiding component 4. When the axial length of the pressurizing base 31 is limited at both ends, the difference between the depth of the cavity 34 and the length 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 of the maximum opening of the cavity 34 and the radius of the maximum radial surface of the pressurizing component 3 at the air outlet F is less than a second difference value, thus enabling the pressurizing component 3 to reuse its pressurizing and accommodating functions. Furthermore, when the thickness of the rotating base 21 and the pressurizing base 31 is limited, the outwardly expanding pressurizing ramp M can make the radius of the end face 341 of the cavity 34 adjacent to the rotating base 21 and the radius of the radial section of the housing 1 at the air outlet F less than a third difference value. This allows for an increase in 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 base 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 enough space to form the first high negative pressure zone A. Simultaneously, it ensures that the airflow is pressurized and discharged from the gap formed between the pressurizing inclined surface M and the housing 1 at the outlet F. Of course, in other embodiments, the first, second, and third difference values ​​can be adjusted to other values, as long as the accommodating and pressurizing functions of the pressurizing component 3 are balanced.

[0068] refer to Figures 5 to 7 The pressurizing inclined surface M and the housing 1 form a pressurizing guide channel T. The pressurizing inclined surface M includes a guide surface 211 and a 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 guide surface 211 of the mixing 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.

[0069] 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.

[0070] 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 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.

[0071] Both the first airflow guide surface 111 and the second airflow guide surface 121 are radially protruding convex surfaces. Furthermore, the first airflow guide surface 111 and the second airflow guide surface 121 first increase radially and then decrease radially from the air inlet end R to the air outlet end F, forming a smooth and complete arc surface. The first airflow guide surface 111 and the second airflow guide surface 121 not only increase airflow and air pressure but also improve the aesthetics of the housing 1. The radial distance between the second airflow guide surface 121 at the air outlet end F and the rotating shaft 24 is greater than the radial distance between the first airflow guide 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 upwards and relatively away from the rotating shaft 24, thereby increasing the air delivery distance.

[0072] refer to Figures 4 to 6The axial airflow at the inlet R changes to flow obliquely forward along the guide surface 211, causing the airflow closer to the axial direction to flow outward at an oblique angle. The oblique airflow at the outlet F of the mixed-flow fan 2 changes to flow obliquely forward along the pressurizing surface 311, and further obliquely outward, to leave sufficient space near the axis of the pressurizing component 3. This sufficient space can be used to accommodate the induced draft component 4. The line connecting the front and rear ends of the 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, so as 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 guide surface 211 is at least partially concave towards the rotating shaft 24, and the axial airflow at the inlet R flows along the guide surface 211, whose slope increases abruptly, 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 is rapidly pressurized by the air guide surface 211 and then by the secondary pressurization of the pressurizing surface 311, forming high-pressure airflow. This results 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.

[0073] 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 towards the rotating shaft 24, so that the mixing fan 2 concentrates the airflow and forms a first high air pressure; such as Figure 4 Viewed from left to right, the distance between the blade tip 222 and the radial clearance of the casing 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 outlet F from flowing back to the inlet R of the mixed flow fan 2 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 inlet R to the 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.

[0074] The first high air pressure is formed by gathering a large air volume at the air inlet R, and at the same time, the second, third and fourth high air pressures are increased. The mixed flow fan 2 has the ability to generate a large air volume and high air pressure, so as to produce 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.

[0075] 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 change the product's airflow, air pressure, and noise. Moreover, during mass production, difficulties in molding 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 low 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, including structure, angle, curvature, aperture, and duct length, through extensive prototyping, experimentation, and testing to obtain a relatively optimal combination of parameters such as structure, angle, curvature, aperture, and duct length. This achieves a balance between airflow, air pressure, and noise, with the ultimate goal of providing the best user experience, resulting in a revolutionary product.

[0076] 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: case; The pressure member is connected to the front side of the housing; The pressurizing component includes a pressurizing seat that increases radially from the air inlet end to the air outlet end, and the pressurizing seat has a cavity recessed rearward at the air outlet end; A mixed-flow fan is located inside the housing and connected to the rear side of the pressurizing member. The mixed-flow fan rotates around a pivot to generate airflow. An air-guiding element is housed in the cavity, the shape of which matches the shape of the cavity to form a second high negative pressure zone, and the air-guiding element is used to house the device.

2. The portable bladeless fan according to claim 1, characterized in that, The air-guiding component includes a central portion and an edge portion, wherein the edge portion bends and extends from the central portion in a direction away from the cavity.

3. The portable bladeless fan according to claim 2, characterized in that, The housing has a first air inlet on the rear side and a first air outlet on the front side, and the first air inlet and the first air outlet are connected inside the housing. The cavity has a circular radial cross-section and 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. 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.

4. The portable bladeless fan according to claim 3, characterized in that, It also includes a second air inlet and a second air outlet; 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 is located on the radial inner side of the first air outlet. The first air outlet is located radially outside the cavity, and the region 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.

5. The portable bladeless fan according to claim 4, characterized in that, The air intake component is provided with a ventilation port, which is connected to the second air outlet. The air is continuously supplied to the second high negative pressure zone through the negative pressure channel, thereby reducing the airflow pulling and interference of pressurized mixed flow, making the air outlet stable and increasing the air volume and air delivery distance.

6. The portable bladeless fan according to any one of claims 2-5, characterized in that, The central portion and the edge portion form a semi-open receiving portion for a replaceable device.

7. The portable bladeless fan according to claim 5, characterized in that, The air-expelling component is used to install replaceable devices; The device is disposed at the center, and a ventilation opening is disposed at the center near the edge and / or at the edge, with a gap between the ventilation opening and the device.

8. The portable bladeless fan according to claim 1, characterized in that, From the air inlet to the air outlet, the mixing fan and the pressurizing base are radially enlarged to form a trumpet shape, thereby creating an outwardly expanding pressurizing slope, which includes an air guiding surface and a pressurizing surface.

9. The portable bladeless fan according to claim 8, characterized in that, The portable bladeless fan is configured such that the axial wind at the air inlet is changed to flow obliquely forward along the air guide surface, so that the wind closer to the axis flows obliquely outward. The mixed-flow fan changes the tilted airflow at the outlet end to flow tilted forward along the pressurizing surface, and further tilted outward, so as to leave enough space in the part of the pressurizing component near the axis, which can be used to accommodate the air duct.

10. The portable bladeless fan according to claim 9, characterized in that, The line connecting the front and rear ends of the air guide forms a first angle with the rotating shaft, and the line connecting the front and rear ends of the pressurizing surface forms a second angle with the rotating shaft. The first angle is greater than the second angle, so as to increase the air pressure while reducing the loss of air volume.

Images