Portable bladeless fan

Abstract

We provide a portable bladeless fan that produces a powerful, low-noise breeze with high air pressure and airflow. [Solution] A portable bladeless fan comprising a housing 1 having an intake section 11 on the rear side and an outlet section 12 on the front side, wherein the intake section 11 and the outlet section 12 are in communication within the housing 1; a mixed-flow fan 2 provided within the housing 1 and rotating around a rotation axis 212 to generate airflow; and a pressurizing member 3 connected to the front portion of the housing 1 and located in front of the mixed-flow fan 2, including a pressurizing seat 31 and a plurality of second blades 32.

Description

Technical Field

[0001] This application relates to the technical field of fans, and specifically to a portable bladeless fan with a large air volume and a large air pressure.

Background Art

[0002] The fans commonly seen in daily life are axial fans. Axial fans are characterized in that the path from intake to blowing out is substantially equivalent to a straight-in and straight-out without deviation in the radial direction. The air enters the axial fan axially from the intake end and also leaves axially from the blowing end. Such a method has a small air resistance, so the air volume loss is small. That is, under the default situation, those skilled in the art manufacture axial fans using axial blades to ensure a small air volume loss. As time goes by, this has formed a consensus and has become an intractable technical prejudice. Therefore, those skilled in the art have no idea of solving this technical problem, and it is taken for granted that using axial fans is correct. And the investment in research and development is small, the cost is low, and if the sales of fan products are carried out quickly, benefits can be obtained from the capital market.

[0003] However, unlike the commercial philosophy of other companies in this field, which pursues low development costs and aims to capture the market and generate profits by rapidly releasing products, the inventors of this application have diligently conducted research in the field of fan technology. They have thoroughly investigated and clarified fluid theory, the market for fan products, the pain points experienced by users during use, and user demand. Furthermore, through their research in this industry, they have found that, taking handheld fans or general desk fans as examples, conventional axial flow fans have low wind resistance and low airflow loss, but they completely fail to consider other technical challenges such as low wind pressure and short airflow distance. In other words, although there is no airflow loss, there is no way to increase the airflow to replenish it, and it is difficult to guarantee the airflow distance. As a result, the normal usage distance of a typical portable fan is about 1 to 1.5 meters, and at even slightly greater distances, it becomes impossible to experience the refreshing feeling of being cooled by the breeze. Furthermore, because the blades of an axial fan are visible, infants and toddlers are more likely to cut their fingers and get injured when using it. Also, if foreign objects such as toys or chopsticks are placed in the blades, they may break or shatter, easily injuring people. Conventional axial fans cannot fully meet the user's need for safe use.

[0004] The inventors of this application have found that while some portable fans have overcome the drawback of low air pressure by employing centrifugal blades, the air enters the centrifugal fan axially from the intake end and moves radially away from the outlet end, resulting in large changes in airflow direction, significant airflow loss, and difficulty in meeting user needs for effective airflow.

[0005] Furthermore, as is well known in the industry, (not listed due to violation of public order and morals) has released a bladeless fan, but it is manufactured using an ultra-high-speed blower to achieve sufficient airflow, and its volume typically reaches 30*30*150 cm³ (cubic centimeters), occupying a very large space, making it inconvenient to use and difficult to carry. Moreover, (not listed due to violation of public order and morals)'s fan products generally cost between 3,000 and 8,000 yuan, which is extremely expensive for the average household or individual, and can even be considered a luxury item, thus having no practical value for the average user.

[0006] In recent years, products and patents imitating (not published due to violation of public order and morals) bladeless fans have appeared, some of which are for handheld and portable use. However, these products either fail to achieve thinness, or they sacrifice airflow and wind power in pursuit of thinness, thus failing to meet user needs. In particular, products employing diagonal flow fans produce sharp and unpleasant motor and wind noise, making them unacceptable to users and thus preventing them from becoming high-performance fan products.

[0007] Due to the aforementioned technical challenges and biases, conventional portable fans have failed to meet user needs. Furthermore, as living standards improve and the applications of fans become more diverse, people's demand for portable fans has increased. After diligent research into the aforementioned technical challenges, biases, user needs, safety issues, and market products, the inventors of this application, after several years of research and experimentation, have designed a portable bladeless fan with a small volume, high airflow, high air pressure, and low noise, thereby solving the aforementioned problems in this field. [Overview of the project]

[0008] The main objective of this application is to provide a portable bladeless fan that produces a wind with high air pressure and force and low noise by installing a mixed-flow fan inside a housing and rotating it to generate a mixed-flow wind, while simultaneously pressurizing the mixed-flow wind with a pressurizing member and regulating the mixed-flow wind with multiple second blades. [Brief explanation of the drawing]

[0009] Embodiments of this application will be described in conjunction with the drawings. The drawings of this application are for illustrative purposes only and are used solely to describe the embodiments. Without departing from the principles of this application, those skilled in the art can easily prepare other embodiments by following the steps described below.

[0010] [Figure 1] This is a perspective view of the first embodiment of the portable bladeless fan according to this application. [Figure 2] This is an exploded schematic view from one angle of the first embodiment of the portable bladeless fan according to this application. [Figure 3] This is an exploded schematic view from another angle of the first embodiment of the portable bladeless fan according to this application. [Figure 4] This is a cross-sectional view in one direction of a first embodiment of the portable bladeless fan according to this application. [Figure 5] This is a cross-sectional view in a different direction of the first embodiment of the portable bladeless fan according to this application. [Figure 6] This is a schematic diagram of the second housing, pressurizing member, front half of the handle, and wire retaining plate in the portable bladeless fan according to this application. [Figure 7] This is a schematic perspective view of the portable bladeless fan according to this application, with the first housing removed. [Figure 8] This is a perspective view of a second embodiment of the portable bladeless fan according to this application. [Figure 9] This is an exploded schematic view from one angle of a second embodiment of the portable bladeless fan according to this application. [Figure 10] This is an exploded schematic view from a different angle of the second embodiment of the portable bladeless fan according to the present application. [Figure 11] This is a cross-sectional view in one direction of a second embodiment of the portable bladeless fan according to this application. [Figure 12] This is a cross-sectional view in a different direction of a second embodiment of the portable bladeless fan according to the present application. [Figure 13] This is a schematic diagram of the second housing, pressurizing member, front half of the handle, and wire retaining plate in the portable bladeless fan according to this application. [Modes for carrying out the invention]

[0011] The following provides a clear and complete description of the technical concepts in the embodiments of this application, accompanied by the drawings of those embodiments. For ease of understanding, the specific embodiments described herein are for interpretive purposes only and do not limit this application. Furthermore, for the sake of clarity, the drawings show only those parts relevant to this application, not all structures. All other embodiments derived from the embodiments of this application, without requiring any creative effort by a person skilled in the art, fall within the scope of protection of this application.

[0012] The terms "first," "second," etc., used in this application are intended to distinguish different subjects and not to describe a specific order. Furthermore, the terms "includes" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus comprising a series of steps or units may include, but is not limited to, any steps or units not listed, or optionally include other steps or units specific to those processes, methods, products, or apparatus.

[0013] Where the “Examples” are referred to herein, it means that certain features, structures, or characteristics described in conjunction with the Examples may be included in at least one Example of this Application. The appearance of this phrase at different points in the Specification does not necessarily all refer to the same Example, nor do they represent mutually exclusive or alternative Examples. As those skilled in the art will understand both explicitly and implicitly, the Examples described herein can be combined with other Examples.

[0014] As shown in Figures 1 to 7, these are schematic diagrams of a first embodiment of the portable bladeless fan 100 of this application. In this embodiment, the portable bladeless fan 100 is a handheld bladeless fan and has a handle 5 for the user to hold. Of course, the portable bladeless fan 100 may also be a clamp fan with a clamp installed, a flexible fan with a bending and shaping member for winding installed, a desk fan with a stand installed, a floor fan with an extendable stand installed, or a mini fan without a handle 5, clamp, bending and shaping member, stand, extendable stand, etc., and is not limited to these.

[0015] In other embodiments, a semiconductor cooling member (not shown, the same applies hereinafter) may be further provided on the handle 5, allowing the user to carry the portable bladeless fan 100 by the handle 5, and the semiconductor cooling member can automatically adjust the cooling temperature in response to the temperature of the contact area between the user and the handle 5, thereby improving the user's comfort when carrying the fan. It should be understood that the portable bladeless fan 100 is used for blowing air, dissipating heat, and cooling, and accordingly the semiconductor cooling member is used for cooling. When a heating element is added to the portable bladeless fan 100 for use in heat retention and heating, the semiconductor cooling member may accordingly be used for heating and heat retention.

[0016] As shown in Figures 1 to 3, the portable bladeless fan 100 includes a housing 1, a pressurizing member 3, and a mixed-flow fan 2, and the radial cross-sectional contours of the housing 1, the pressurizing member 3, and the mixed-flow fan 2 are all substantially circular. The pressurizing member 3 is connected to the front portion of the housing 1, and the pressurizing member 3 and the housing 1 are molded together, although the pressurizing member 3 and the housing 1 may be molded separately before the pressurizing member 3 is attached to the housing 1. The mixed-flow fan 2 is provided inside the housing 1 and connected to the rear side of the pressurizing member 3, and the mixed-flow fan 2 rotates around a rotation axis 212 to generate airflow. The extension direction perpendicular to the rotation axis 212 and passing through the rotation axis 212 is the radial direction, and the direction parallel to the rotation axis 212 is the axial direction.

[0017] As shown in Figures 2 to 4, an intake section 11 is provided on the rear side of the housing 1, and an outlet section 12 is provided on the front side, with the intake section 11 and the outlet section 12 communicating within the housing 1. The intake section 11 is provided on an intake plate 13, and the outlet section 12 is located between the front end of the pressurizing member 3 and the front end of the housing 1. A handle 5 for the user to hold and use is formed at the lower end of the housing 1. The housing 1 includes a first housing 1a and a second housing 1b that fit together front to back. The first housing 1a extends from the radially outside of the intake section 11, first increasing radially towards the rear, and then extending in the opposite direction, increasing radially towards the front. The second housing 1b extends from the rear to the front, decreasing radially. Here, the first housing 1a extends radially backward first, but only slightly, while the entire first housing 1a continues to extend radially forward, resulting in an overall arc shape and a beautiful external form. The portion of the first housing 1a that extends radially backward first allows a portion of the intake plate 13 to be housed within the first housing 1a, preventing the intake plate 13 from being too conspicuous. The ratio of the lengths of the front and rear ends of the first housing 1a to the lengths of the front and rear ends of the second housing 1b is 0.9 to 1 or 1 to 1.2, achieving miniaturization while rationally balancing the relationship between airflow and air pressure, and the near 1:1 ratio further enhances the aesthetic appearance of the first housing 1a and the second housing 1b.

[0018] As shown in FIGS. 2 to 4, the mixed-flow fan 2 includes a rotating seat 21 and a plurality of first blades 22. The rotating seat 21 includes a wind guiding surface 211 that increases in the radial direction from back to front. The plurality of first blades 22 are connected to the wind guiding surface 211 and are arranged at intervals, and the plurality of first blades 22 are arranged equidistantly on the wind guiding surface 211. The first blade 22 spirally extends at a predetermined angle along the circumferential direction of the wind guiding surface 211 from back to front. When viewed from the back, the interval between any two adjacent first blades 22 at their front ends is larger than the interval at their rear ends, which is advantageous for increasing the intake air volume. The rotating seat 21 is substantially frustum-shaped, and the radial cross-sectional area of the rear end of the rotating seat 21 is smaller than the radial cross-sectional area at its front end, and the rotating seat 21 has a relatively large radial cross-section at the front end. The rotating seat 21 further includes an extension wall 213 connected to the inner wall of the rotating seat 21 and extending forward. The extension wall 213 and the rotating seat 21 are jointly provided to surround and form a first cavity 214 that opens forward.

[0019] As shown in FIGS. 4 and 5, at least a part of the wind guiding surface 211 is recessed in the direction of the rotating shaft 212. It should be understood that at least a part of the wind guiding surface 211 may be recessed in the direction of the rotating shaft 212 so that the mixed-flow fan 2 can collect and expand the wind to form a high wind pressure. Of course, the wind guiding surface 211 may be an inclined plane, or may at least partially protrude away from the rotating shaft 212, and is not limited thereto.

[0020] As shown in FIGS. 3 to 5, the pressing member 3 includes a pressing seat 31 and a plurality of second blades 32. The pressing seat 31 includes a pressing surface 311 that at least partially increases radially from the rear to the front. The plurality of second blades 32 are connected to the pressing surface 311 and are arranged at intervals, and the plurality of second blades 32 are arranged equidistantly on the pressing surface 311. The plurality of second blades 32 are connected to the housing 1. After the skew flow air current generated by the mixed-flow fan 2 flows to the pressing surface 311, the plurality of second blades 32 straighten and convert the air current to form a direct current air flow that blows out parallel to the rotating shaft 212, thereby increasing the blowing distance, reducing turbulence, noise and vibration, reducing the noise generated by turbulence interference, realizing noise reduction, converting sharp sounds into dull sounds, reducing the noise of the mixed-flow air formed by the mixed-flow fan 2, greatly improving the static pressure, reducing energy consumption, strengthening the concentration of the blowing of the mixed-flow fan 2, and the second blades 32 equalize the air flow formed by the mixed-flow fan 2 and increase the air pressure. The pressing seat 31 is connected to the housing 1 through the second blades 32. The rotating seat 21 is connected to the pressing seat 31 through a fixed fitting structure. The mixed-flow fan 2 is relatively fixed in the housing 1 by the pressing seat 31. Here, the radius of the maximum radius surface at the front end of the pressing member 3 is 21.3 to 22 mm (millimeters, the same hereinafter), which is easy to carry under the condition of ensuring sufficient air volume and air pressure.

[0021] As shown in FIGS. 3 to 5, at least a part of the pressing surface 311 increases radially from the rear to the front. At the same time, at least a part of the pressing surface 311 is recessed in the direction of the rotating shaft 212. At least a part of the air guiding surface 211 and the pressing surface 311 are recessed radially to form a concave surface to absorb a part of the noise of the fluid. Specifically, the pressing surface 311 increases radially as a whole from the rear to the front. Of course, in other embodiments, the pressing surface 311 may first extend forward parallel to the rotating shaft 212 from the rear to the front and then increase radially, or may first decrease radially, and this is not limited thereto.

[0022] As shown in Figures 3 to 5, the pressure seat 31 also has a roughly frustoconical shape, and the radial cross-sectional area of ​​the rear end of the pressure seat 31 is smaller than the radial cross-sectional area of ​​its front end, so the pressure seat 31 has a large radial cross-section at its front end. The radius of the radial cross-section of the pressure seat 31 at its front end is 21.3 to 22 mm, which expands the airflow area while ensuring sufficient airflow and air pressure. The guide surface 211 and the pressure surface 311 increase in diameter overall, forming a trumpet shape, which expands outward, and the thickness of the pressure seat 31 in the front-rear direction is 9.5 to 14.5 mm, which greatly increases the pressurized stroke of the airflow, and the pressurized slope, in accordance with the housing 1, converts sharp noise into a muffled sound. The pressure seat 31 increases radially from rear to front, while the second housing 1b extends while decreasing radially from rear to front. In other words, the second housing 1b and the pressure seat 31 extend forward and simultaneously move closer to each other, and the wind is blown out from the slit formed by the front end of the pressure seat 31 and the front end of the second housing 1b, which is advantageous for increasing wind force, wind pressure and airflow distance.

[0023] As shown in Figures 4 and 5, the rotating seat 21 and the pressure seat 31 are installed adjacent to each other in the axial direction with a gap between them, and the air guide surface 211 and the pressure surface 311 are installed adjacent to each other in the axial direction with a gap between them. The axial gap between the rotating seat 21 and the pressure seat 31, and the axial gap between the air guide surface 211 and the pressure surface 311 are both 1 to 4 mm, so that the air generated by the mixed-flow fan 2 flows smoothly to the pressure surface 311, reducing noise caused by turbulence. The radial cross-section of the front end of the rotating seat 21 and the radial cross-section of the rear end of the pressure seat 31 are both circular, and the difference in their radii is very small. In this embodiment, the difference in their radii is less than 1 mm, so that the air generated by the mixed-flow fan 2 flows smoothly to the pressure surface 311.

[0024] As shown in Figures 3 to 5, the pressure seat 31 is provided with a second cavity 313 that opens backward, and the extension wall 213 is inserted forward into the second cavity 313, so that the first cavity 214 and the second cavity 313 overlap at least partially in the radial direction, reducing the occupied space. The mixed-flow fan 2 further includes a motor 23, which is an outer rotor type brushless motor 23, and the motor 23 is housed in the first cavity 214 and the second cavity 313, and the openings of the first cavity 214 and the second cavity 313 shield each other, thereby providing shielding against the noise of the motor 23 and wind noise, converting sharp noise into a muffled sound. At the same time, the fixed fitting structure between the mixed-flow fan 2 and the pressure member 3 is also housed in the first cavity 214, making good use of the space. The fixed fitting structure specifically includes the rotating shaft 212 protruding forward from within the first cavity 214 and the protruding column 312 formed protruding backward from the second cavity 313. The rotating shaft 212 is inserted into the protruding column 312 and fixed using bearing components. The service life of the outer rotor type brushless motor 23 can reach 15,000 hours, and because it eliminates the electrical sparks generated during the operation of the brushed motor 23, interference with the remote control of wireless electrical equipment due to electrical sparks can be greatly reduced. When operating in a brushless manner, frictional force is greatly reduced, allowing for smooth operation and a high noise reduction effect.

[0025] As shown in Figures 4 and 5, there is a safe pressure receiving distance between the intake plate 13 and the rear end of the rotating seat 21, allowing the intake plate 13 to receive maximum pressure and deform within the pressure range that satisfies the allowable performance of the material. In this embodiment, the distance between the intake plate 13 and the rear end of the rotating seat 21 is 5.5 to 7.5 mm, so that the rear end has space for the entry of a large volume of air and space for the intake plate 13 to receive maximum pressure and deform when it receives a large volume of air. The radial cross-sectional area of ​​the intake plate 13 is greater than or equal to the maximum radial cross-sectional area of ​​the rotating seat 21, thereby ensuring a sufficient intake volume and achieving noise reduction, converting sharp noise into a muffled sound. The radial cross-sectional area of ​​the intake plate 13 is less than or equal to the radial cross-sectional area of ​​the pressure seat 31 at its front end, and the intake portion 11 on the intake plate 13 is shielded by the pressure seat 31 in front. When in use, the intake section 11 is not visible from the front, meaning that the light from the intake section 11 is not projected from the rear to the front, thereby reducing the impact on the human eye due to the rotation of the mixed-flow fan 2. As the rotating seat 21 increases radially from the rear to the front, the first blades 22 are closer to the intake plate 13 than the rotating seat 21, thereby enhancing the collection capacity of the mixed-flow fan 2.

[0026] As shown in Figures 4 and 5, the front end of the pressurizing member 3 is recessed backward, and a front cover 33 is further provided on the front end of the pressurizing member 3. The front cover 33 is recessed backward to form a negative pressure region 331, so that the local airflow flows just above the front of the front cover 33 after being blown out from the outlet 12, thereby replenishing the negative pressure region 331 with air and reducing turbulence. In addition, in other embodiments, the front cover 33 may be used to detachably install an IP character article, and the front cover 33 may be exposed or covered with at least partially transparent material, thereby improving interaction between the user and the IP character article. Detachable installation avoids the need to customize different molds for different partners, allowing one set of molds to accommodate multiple IP partners, which can reduce the production cost of IP partners by approximately 40%, and exposed IP character articles increase direct user contact with the IP character article, changing the conventional user experience. The front cover 33 may be used for installing an aroma assembly, for installing an assembly that combines humidification and aroma, for storing a USB cable, for use as a mirror for an LED lamp, etc., and is not limited to these uses.

[0027] As shown in Figures 3 to 5, the portable bladeless fan 100 further includes a pressure booster 4 connected to the housing 1 and surrounding the mixed-flow fan 2. In addition to its pressure-boosting function, the pressure booster 4 also has an effect similar to sound-insulating glass, thereby reducing noise. Here, a first passage T1 is formed between the mixed-flow fan 2 and the pressure booster 4, and a second passage T2 is formed between the pressurizing member 3 and the housing 1. The first passage T1 and the second passage T2 together form a pressurized flow guide passage T, and the air passes from the intake section 11 through the pressurized flow guide passage T before being discharged from the outlet section 12. The front end of the pressure intensifier 4 is connected to the portion of the pressurizing member 3 closest to the second housing 1b, that is, the pressure intensifier 4 is mounted facing forward behind the second blade 32, and the rear end of the pressure intensifier 4 is connected to the portion of the first housing 1a closest to the intake portion 11, creating a gap between the pressure intensifier 4 and the first housing 1a to absorb the noise generated by the rotation of the mixed-flow fan 2.

[0028] As shown in Figures 3 to 5, the pressure booster 4 includes a pressure boosting surface 41 that faces the mixed-flow fan 2 and increases radially at least partially from rear to front. At least a portion of the air guide surface 211 and the pressurizing surface 311 is radially recessed to form a concave surface, and at least a portion of the pressure boosting surface 41 is radially protruding to form a convex surface, thereby increasing the volume in the pressurized flow passage T and collecting air. By maintaining the minimum radial gap distance between the first blade 22 and the pressure boosting surface 41 within the error range of the equivalent blocking distance, the airflow generated at the front end of the mixed-flow fan 2 is blocked from bypassing the minimum radial gap and returning to the rear end, thereby increasing the pressure and reducing noise due to turbulent interference.

[0029] As shown in Figures 3 to 5, the front end of the pressure intensifier 4 is flush with the front end of the mixed-flow fan 2, or the front end of the pressure intensifier 4 extends forward beyond the front end of the mixed-flow fan 2 to sufficiently increase the pressure. The height of the front end of the pressure intensifier 4 is 1.4 to 3.7 mm, and the front end of the pressure intensifier 4 and the housing 1 are stepped to allow the high-pressure air generated by the mixed-flow fan 2 to flow quickly to the pressurizing member 3.

[0030] As shown in Figures 3, 4, 6, and 7, a wire passage groove 321 is provided in one of the second blades 32, and in this embodiment, the wire passage groove 321 is provided in the second blade 32 connected to the handle 5, and the wire passage groove 321 communicates with the first cavity 214. At least a portion of the main board 6 is provided in the handle 5, and in this embodiment, a portion of the main board 6 is provided in the handle 5, and the other portion of the main board 6 is provided in the housing 1, and the main board 6 is located behind the wire passage groove 321, and the main board 6 and the wire passage groove 321 overlap at least partially in the front-to-back direction. The conductor 7 is connected to the motor 23 and the main board 6, and the conductor 7 is connected from the motor 23 through the wire passage groove 321 to the main board 6. The main board 6 has a first surface 61 and a second surface 62 that are parallel to each other, the first surface 61 is installed facing backward, and the second surface 62 is installed facing forward, one end of the conductor 7 is connected to the motor 23, and the other end of the conductor 7 is connected to the main board 6 and located on the first surface 61. If the conductor 7 is mounted on the second surface 62 of the main board 6, the worker must install the main board 6 into the housing 1 and the handle 5 under conditions where the conductor 7 is obscured. In this case, the worker cannot guarantee that the conductor 7 will not be pressed against the main board 6, the conductor 7 is prone to being crushed, making assembly difficult and likely to cause rework. Therefore, mounting the conductor 7 on the first surface 61 of the main board 6 is advantageous for improving assembly quality and assembly efficiency.

[0031] As shown in Figures 3, 4, 6, and 7, a wire retaining plate 8 is further provided on the rear side of the wire passage groove 321, and the wire retaining plate 8 restricts the movement of the conductor 7. Both ends of the wire passage groove 321 extend backward and are provided with stopper blocks 322, which abut against the wire retaining plate 8 and restrict the movement of the wire retaining plate 8 on the mounting plane. A buckle 81 extends from the end of the wire retaining plate 8 closest to the motor 23 toward the wire passage groove 321, and the buckle 81 passes through the wire passage groove 321 and engages with the stopper block 322, restricting the backward movement of the wire retaining plate 8. An insertion block 82 extends from the end of the wire retaining plate 8 away from the drive assembly toward the wire passage groove 321, and the insertion block 82 is inserted into the wire passage groove 321, restricting the backward movement of the wire retaining plate 8. The wire retaining plate 8 is further provided with a projection 83 facing the wire passage groove 321, the projection 83 pressing down on the conductor 7 to prevent the rear end of the conductor 7 from swinging within the wire passage groove 321 during use, and reducing noise generated by the swinging friction between the conductor 7 and the wire passage groove 321.

[0032] As shown in Figures 3, 4, 6, and 7, a light-emitting member 63 is provided on the second surface 62, an opening 51 corresponding to the light-emitting member 63 is provided on the handle 5, a light guide column 52 is provided on the side of the wire passage groove 321 away from the motor 23, one end of the light guide column 52 abuts against the second surface 62, and the other end of the light guide column 52 is connected to the inside of the handle 5, and the light emitted by the light-emitting member 63 is emitted from the opening 51 along the light guide column 52. There is a gap between the booster 4 and the light guide column 52, and the conductor 7 passes through the wire passage groove 321, passes through the gap between the booster 4 and the light guide column 52, bypasses the outer wall of the booster 4 and is electrically connected to the first surface 61, thereby making the entire structure more compact, smaller and more sophisticated, and with a higher space utilization rate.

[0033] As shown in Figures 8 to 13, these are schematic diagrams of a second embodiment of the portable bladeless fan 100 of this application. Compared to the portable bladeless fan 100 described in the first embodiment, the portable bladeless fan 100 described in the second embodiment has a larger volume and is flatter. In this embodiment, the ratio of the lengths of the front and rear ends of the first housing 1a to the lengths of the front and rear ends of the second housing 1b is 1 to 1.5, achieving a thinner design while also rationally balancing the relationship between airflow and wind pressure. The radius of the maximum radial surface at the front end of the pressurizing member 3 is 28 to 35 mm, that is, the radius of the radial cross-section at the front end of the pressurizing seat 31 is 28 to 35 mm, expanding the airflow area while ensuring sufficient airflow and wind pressure. The extension wall 213 does not protrude forward from the rotating seat 21, and the extension wall 213 is not inserted forward into the second cavity 313. The first cavity 214 and the second cavity 313 are installed adjacent to each other with a gap between them, but they do not overlap. The distance between the intake plate 13 and the rear end of the rotating seat 21 is 7.4 to 9.8 mm. The pressure-increasing surface 41 is a smooth surface, which allows the air to flow more smoothly and evenly to the pressurizing member 3.

[0034] As shown in Figure 11, in this embodiment, the main board 6 is entirely housed within the handle 5, and the main board 6 is located below the wire passage groove 321. The main board 6 has an upward-facing first surface 61 and a downward-facing second surface 62. The light-emitting member 63 is provided on the first surface 61, and the opening 51 is provided on the second housing 1b and connected to the inside of the second housing 1b corresponding to the light guide column 52. There is a gap between the booster 4 and the first surface 61, and the conductor 7 passes through the wire passage groove 321, through the gap between the booster 4 and the first surface 61, and then is electrically connected to the first surface 61. The components of the second embodiment are substantially the same as those of the first embodiment and will not be described further here.

[0035] The foregoing describes preferred embodiments of the present application and does not limit the scope of the claims of this application. Any equivalent structures or flow transformations, or direct or indirect applications to other related technical fields, made using the contents of the specification and drawings of this application are all similarly included within the scope of the claims of this application.

Claims

1. A portable fan comprising a housing, a mixed-flow fan, and a pressurizing member, An intake section is provided on the rear side of the housing, and an outlet section is provided on the front side of the housing, and the intake section and the outlet section are in communication within the housing. The mixed-flow fan is provided inside the housing, The pressurizing member is installed on the front side of the mixed-flow fan and includes a pressurizing seat, the pressurizing seat includes a pressurizing surface that increases radially at least partially from back to front. Herein, the mixed-flow fan includes a rotating seat, an extension wall, a motor, and a plurality of first blades, the plurality of first blades being mounted on the rotating seat, the extension wall and the rotating seat together forming a first cavity having a forward-facing opening, the pressurizing seat having a second cavity having a rearward-facing opening, the extension wall being inserted forward into the second cavity, the first cavity and the second cavity overlapping at least partially in the radial direction, and the motor being housed within the first cavity and the second cavity, a portable fan.

2. The portable fan according to claim 1, wherein a part of the extended wall is placed inside the rotating seat and connected to the inner wall of the rotating seat.

3. The portable fan according to claim 1, wherein the extended wall extends forward beyond the rotating seat, the portion of the extended wall beyond the rotating seat is inserted into the second cavity, and the rotating seat and the pressure seat maintain a constant distance in the axial direction.

4. The portable fan according to claim 2 or 3, wherein the axial insertion depth of the stretched wall into the second cavity is greater than the radial gap between the stretched wall and the cavity wall of the second cavity.

5. The portable fan according to claim 2 or 3, wherein the rotating seat includes an air guide surface that increases radially from rear to front, and a plurality of the first blades are connected to and spaced apart from the air guide surface, the radial cross-sectional area of ​​the rear end of the rotating seat is smaller than the radial cross-sectional area of ​​the extension wall, and the radial cross-sectional area of ​​the front end of the rotating seat is larger than the radial cross-sectional area of ​​the extension wall.

6. The portable fan according to claim 5, wherein the axial distance between the rotating seat and the pressure seat is 1 to 4 mm, the radial cross-section of the front end of the rotating seat and the radial cross-section of the rear end of the pressure seat are both circular, and the difference between their radii is less than 1 mm.

7. The portable fan according to claim 1, wherein the mixed-flow fan and the pressurizing member are connected to each other by a fixed fitting structure housed in the first cavity.

8. The portable fan according to claim 7, wherein the fixed fitting structure includes a rotating shaft protruding forward from within the first cavity and a first convex column formed protruding backward from the second cavity, the front end of the rotating shaft being inserted into the first convex column and fixed using bearing components.

9. The portable fan according to claim 8, further comprising a second convex column, the second convex column being located within the first cavity, the rear end of the second convex column being connected to the rotating seat, and the rear end of the rotating shaft being inserted into the front end of the second convex column.

10. The portable fan according to claim 9, wherein the front end of the second protruding column is further inserted into the first protruding column while maintaining a predetermined radial gap.

11. The portable fan according to claim 8, wherein the first convex column extends into the extension wall, and the motor is an outer rotor type brushless motor disposed in the radial gap between the first convex column and the extension wall.

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