A high-speed bladeless handheld fan

Abstract

The utility model discloses a high -speed handheld fan of no blade, including upper cover, lower cover, air inlet tail cover, the upper cover has the air outlet end and upper handle part of annular cavity, the air outlet end has the air outlet inner wall and upper cover shell of integrated downward bending, the lower cover has the air inlet end and lower handle part of annular cavity, the air inlet end has the air inlet inner wall and lower cover shell of integrated upward bending, the air outlet inner wall with air inlet inner wall is the cylinder, the diameter of air outlet inner wall is greater than the diameter of air inlet inner wall, the air outlet inner wall nests into the annular cavity of air inlet end, air outlet inner wall with air inlet inner wall has the overlap portion longitudinally, and the first annular gap between the overlap portion of air outlet inner wall and the overlap portion of air inlet inner wall forms the first air outlet, and the overlap portion of first air outlet makes the turbulent airflow in the cavity finally along with the gap between air outlet inner wall and air inlet inner wall even blow out.

Description

Technical Field

[0001] This utility model relates to the technical field of pet hair dryers, and more particularly to a high-speed bladeless handheld fan. Background Technology

[0002] Handheld fans, as portable cooling devices, are widely used in daily commutes, outdoor activities, and office / study scenarios due to their compact size and flexible usage. However, as users' demands for a better user experience increase, existing handheld fans still have room for improvement in areas such as air intake efficiency, heat dissipation, airflow stability, and air volume. In current technology, the motor of a handheld fan is usually integrated into the fan head, and the air intake structure is mostly located on the side or back of the fan head. The layout of the air intake channel and components such as the battery and control board lacks coordinated design, easily leading to high air intake resistance. Furthermore, when external airflow directly flows over the motor and electronic components, dust and impurities may adhere, affecting the device's lifespan. At the same time, the space between the battery and the inner wall of the handle housing is not fully utilized, failing to form an effective auxiliary air intake channel, thus limiting air intake efficiency. Regarding heat dissipation, the motor generates heat during operation and battery charging and discharging. Current handheld fans mostly rely on natural heat dissipation or simple airflow designs, making it difficult to quickly dissipate heat from the battery and control board through airflow. Prolonged use can easily lead to excessive temperature rise, affecting motor speed stability and battery lifespan, and even posing safety hazards. In addition, the air outlet design of existing handheld fans mostly adopts traditional grille or single channel structure, which makes the airflow turbulent and uneven at the air outlet, resulting in limited airflow range and poor cooling effect. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, this utility model provides a high-speed bladeless handheld fan to solve the technical problems of uneven and turbulent airflow at the air outlet, small air volume, and heat damage to the control board and battery caused by working heat, resulting in shortened lifespan.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a high-speed bladeless handheld fan, comprising an upper cover, a lower cover, and an air inlet cover. The upper cover has an air outlet end with an annular cavity and an upper handle portion. The air outlet end has an integrally formed downwardly bent air outlet inner wall and an upper cover outer shell. The lower cover has an air inlet end with an annular cavity and a lower handle portion. The air inlet end has an integrally formed upwardly bent air inlet inner wall and a lower cover outer shell. The air outlet inner wall and the air inlet inner wall are cylindrical. The diameter of the air outlet inner wall is larger than the diameter of the air inlet inner wall. The air outlet inner wall is nested within the annular cavity of the air inlet end. The air outlet inner wall and the air inlet inner wall have a longitudinal overlap portion. A first annular gap between the overlapping portion of the air outlet inner wall and the overlapping portion of the air inlet inner wall forms a first air outlet.

[0005] Preferably, the upper handle portion and the lower handle portion are assembled to form a handle portion, and the air inlet tail cover is fixedly installed at the other end of the handle portion.

[0006] Preferably, a fan and a battery are installed in the internal cavity of the handle, and a silicone sleeve is provided between the fan and the inner wall of the handle cavity. The silicone sleeve is used to absorb shock and protect the fan.

[0007] Preferably, the fan includes a high-speed motor assembly, a fan blade assembly, and a functional mainboard, and the outer surface of the silicone sleeve is provided with an air passage, which is a strip-shaped groove along the wind direction.

[0008] Preferably, there is a second annular gap between the battery and the inner wall of the handle portion, and the second annular gap communicates with the first air outlet.

[0009] Preferably, a main control board is fixedly installed inside the air passage, and the main control board is connected to a switch button provided on the upper cover.

[0010] Preferably, the air inlet tail cover has an air inlet mesh, which is the first air inlet.

[0011] Preferably, the bend between the inner wall of the air inlet and the outer shell of the lower cover is provided with an annular long inclined surface, the inner wall of the air inlet is in the shape of an outward flared mouth, and the hollow part of the inner wall of the air inlet forms a second air inlet.

[0012] Preferably, the main control board is connected to the battery and the fan via wires.

[0013] Preferably, the device also includes a bracket disposed in the internal cavity of the handle portion. The bracket has a fan position for fixing the fan, a battery position for fixing the battery, and a main control board position for fixing the main control board. The main control board position is located on the airflow channel formed between the battery and the inner wall of the handle portion. The incoming airflow carries away the working heat generated by the battery and the main control board and then blows it out from the first air outlet.

[0014] Compared with the prior art, the beneficial effects obtained by this utility model are:

[0015] This utility model discloses a high-speed bladeless handheld fan, comprising an upper cover, a lower cover, and an air inlet cover. The upper cover has an air outlet end with an annular cavity and an upper handle portion. The air outlet end has an integrally formed downwardly bent air outlet inner wall and an upper cover outer shell. The lower cover has an air inlet end with an annular cavity and a lower handle portion. The air inlet end has an integrally formed upwardly bent air inlet inner wall and a lower cover outer shell. The air outlet inner wall and the air inlet inner wall are cylindrical, with the diameter of the air outlet inner wall being larger than the diameter of the air inlet inner wall. The air outlet inner wall is nested within the annular cavity of the air inlet end. The air outlet inner wall and the air inlet inner wall have a longitudinal overlap portion. The overlap portion of the air outlet inner wall and the air inlet inner wall... The first annular gap between the overlapping parts of the walls forms the first air outlet. The overlapping part of the first air outlet allows the chaotic airflow in the cavity to eventually be blown out evenly along the gap between the air outlet inner wall and the air inlet inner wall. At the same time, when the airflow blows out along the first air outlet, due to the Coanda effect, it will drive the airflow of the second air inlet formed by the hollow part of the air inlet inner wall to continuously enter the hollow ring, providing power for the airflow of the second air inlet. The bend connection between the air inlet inner wall and the lower cover shell is designed with an annular long slope to increase its air intake volume, which merges with the airflow of the first air outlet and blows out from the main air outlet, which has the beneficial effect of large air volume and uniform air output.

[0016] Furthermore, a fan and a battery are installed in the internal cavity of the handle. There is a gap between the fan and the battery and the inner wall of the handle to form an air passage. The air passage is connected to the first air outlet. The main control board of the fan is set in the air passage. The air inlet cover has an air inlet mesh. The airflow in the air passage carries away the working heat of the main control board and the battery, reducing heat damage and extending service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is an exploded view of the high-speed bladeless handheld fan of this utility model.

[0019] Figure 2 This is a cross-sectional view of the high-speed bladeless handheld fan of this utility model.

[0020] Figure 3 This is a perspective view of the high-speed bladeless handheld fan of this utility model.

[0021] Figure 4 This is a front view of the high-speed bladeless handheld fan of this utility model.

[0022] Reference numerals in the attached diagram: 1-Top cover; 11-Air outlet; 111-Inner wall of air outlet; 112-Outer shell of top cover; 12-Upper handle part; 2-Lower cover; 21-Air inlet; 211-Inner wall of air inlet; 2111-Annular long inclined surface; 212-Outer shell of lower cover; 22-Lower handle part; 3-Air inlet tail cover; 31-Air inlet mesh; 4-Fan; 5-Battery; 6-Silicone sleeve; 7-Bracket; 8-Main control board. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please refer to Figures 1 to 4A high-speed bladeless handheld fan includes an upper cover 1 made of ABS plastic that meets strength and toughness requirements. The upper cover 1 is machined to have an annular air outlet 11 and an upper handle 12. The air outlet 11 is integrally formed with a downwardly bent cylindrical inner wall 111 (30mm in diameter) and an upper cover outer shell 112. The upper handle 12 has a structure reserved for assembly with a lower handle 22, including but not limited to snap-fit ​​and screw holes. The lower cover 2 is also made of ABS plastic and is machined to have an annular air inlet 21 and a lower handle 22. The air inlet 21 is integrally formed with an upwardly bent cylindrical inner wall 211 (25mm in diameter, smaller than the diameter of the air outlet inner wall 111) and a lower cover outer shell 212. An annular long inclined surface 2111 is machined at the bend between the inner wall 211 and the lower cover outer shell 212, making the inner wall 211... The lower handle portion 22, shaped like an outward flare, has an assembly structure adapted to the upper handle portion 12. The air inlet cap 3 has air inlet mesh 31 (uniformly distributed small circular holes, 2mm in diameter, 3mm spacing), serving as the first air inlet. It also has an installation structure adapted to the other end of the handle portion, including but not limited to snap-fit ​​protrusions, threads, and magnetic structures. The annular long inclined surface 2111 can increase its cross-sectional area to increase its air intake, merging with the airflow from the first air outlet and blowing it out from the main air outlet. The fan 4 includes a high-speed motor assembly, a fan blade assembly, and a functional mainboard. The high-speed motor must meet high speed and low noise requirements (e.g., speed 10000-15000 r / min). The fan blade assembly is designed with a reasonable fan blade angle for efficient airflow guidance. The battery 5 is a rechargeable lithium battery (1000mAh capacity) with a suitable handle size and capacity for the handheld fan. The fan 4 has the following components: a silicone sleeve 6 (3mm x 35mm), a silicone sleeve with grooves along the wind direction on its outer surface (groove width 3mm, depth 2mm, spacing 5mm), and an inner diameter adapted to the size of the fan 4 for shock absorption and protection; a main control board 8 with an integrated control circuit, providing interfaces for connection to the switch button, the battery 5, and the fan 4, enabling functions such as fan on / off and wind speed adjustment; and a bracket 7 made of plastic or lightweight metal (such as aluminum alloy), with a fan slot (adapted to the size of the fan 4, with a positioning groove and fixing buckle), a battery slot (matching the size of the battery 5, with a fixing structure), and a main control board slot (located on the battery 5). The airflow channel between the handle and the inner wall is provided with mounting holes and limiting structures to fix the components in the inner cavity of the handle. The battery 5 and the fan 4 are installed sequentially along the airflow direction. The main control board 8 is close to the inner wall of the handle and is located on the airflow channel reserved by the bracket 7.

[0025] The assembly process of the high-speed bladeless handheld fan:

[0026] (a) Assembly of internal components of the handle

[0027] Bracket 7 installation: Place the bracket 7 into the inner cavity of the lower handle portion 22 of the lower cover 2, and initially fix it in a suitable position by means of buckles or screws, ensuring that each installation position of the bracket 7 corresponds to the inner cavity of the handle portion.

[0028] Fan 4 installation: Fit the fan 4 into the silicone sleeve 6 to absorb shock and protect it. Then install the fan 4 with the silicone sleeve 6 on into the fan position of the bracket 7 and fix it with buckles or screws to ensure that the fan 4 is stable. The silicone sleeve 6 fits snugly with the fan 4 and the bracket 7.

[0029] Battery 5 Installation: Place the battery 5 into the battery slot of the bracket 7 and secure it using clips or straps to ensure that the battery 5 is stable in the inner cavity of the handle. Leave a suitable gap with the surrounding components (inner wall of the handle) to form a second annular gap with a gap width of 2mm. The air passage formed by the second annular gap is connected to the first air outlet. The main control board of the fan is set in the air passage. The air inlet tail cover has an air inlet mesh. The airflow in the air passage carries away the working heat of the main control board and the battery, reducing heat damage and extending service life.

[0030] Main control board 8 installation: Install the main control board 8 onto the main control board position of the bracket 7 and fix it with screws so that it is located on the airflow channel formed by the battery 5 and the inner wall of the handle. Then connect the main control board 8 to the battery 5 and the fan 4 with wires to ensure that the connection is firm and the wires are arranged neatly to avoid affecting the airflow and component assembly.

[0031] Silicone sleeve 6 air passage confirmation: Check the strip-shaped groove air passage on the outer surface of silicone sleeve 6 to ensure that there is no blockage or deformation, and that airflow can pass through smoothly.

[0032] (ii) Assembly of upper cover 1 and lower cover 2

[0033] Alignment and Nesting: The air outlet inner wall 111 of the upper cover 1 is nested into the annular cavity of the air inlet end 21 of the lower cover 2, so that the air outlet inner wall 111 and the air inlet inner wall 211 form a longitudinal overlap (overlap length 5mm). A first annular gap (gap width 2.5mm) is formed between the overlapping part of the air outlet inner wall 111 and the overlapping part of the air inlet inner wall 211 as the first air outlet. The overlap of the first air outlet allows the chaotic airflow in the cavity to be blown out evenly along the gap between the air outlet inner wall and the air inlet inner wall. At the same time, when the airflow blows out along the first air outlet, due to the Coanda effect, it will drive the airflow of the second air inlet formed by the hollow part of the air inlet inner wall 211 to continuously enter the hollow ring, providing power for the airflow of the second air inlet.

[0034] Handle part forming: The upper cover 1 and the lower cover 2 are assembled together by the assembly structure (such as snap-fit ​​and screw fastening) of the upper handle part 12 and the lower handle part 22 to form a complete handle part. During the assembly process, it is ensured that the position of each component remains unchanged and the cavity and gap dimensions meet the design.

[0035] Air inlet cap 3 installation: The air inlet cap 3 is fixedly installed on the other end of the handle by means of a suitable installation structure (such as snap-fit ​​or threaded connection) to ensure that the air inlet mesh 31 (first air inlet) of the air inlet cap 3 is unobstructed and well connected with the airflow channel inside the handle.

[0036] Switch button connection: Connect the switch button on the top cover 1 to the main control board 8 through a wire to ensure reliable connection, secure button installation, and smooth pressing.

[0037] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and many similar modifications are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this utility model should be considered within the scope of protection of this utility model.

Claims

1. A high-speed bladeless handheld fan, characterized in that, Includes an upper cover (1), a lower cover (2), and an air inlet cover (3). The upper cover (1) has an air outlet (11) with an annular cavity and an upper handle (12). The air outlet (11) has an integrally formed downwardly bent air outlet inner wall (111) and an upper cover outer shell (112). The lower cover (2) has an air inlet (21) with an annular cavity and a lower handle (22). The air inlet (21) has an integrally formed upwardly bent air inlet inner wall (211) and a lower cover outer shell (212). The air outlet inner wall (111) and the air inlet inner wall (211) are cylindrical. The diameter of the air outlet inner wall (111) is larger than the diameter of the air inlet inner wall (211). The air outlet inner wall (111) is nested in the annular cavity of the air inlet end (21). The air outlet inner wall (111) and the air inlet inner wall (211) have a longitudinal overlap. The first annular gap between the overlap of the air outlet inner wall (111) and the overlap of the air inlet inner wall (211) forms the first air outlet.

2. The high-speed bladeless handheld fan as described in claim 1, characterized in that, The upper handle portion (12) and the lower handle portion (22) are assembled to form a handle portion, and the air inlet tail cover (3) is fixedly installed at the other end of the handle portion.

3. The high-speed bladeless handheld fan as described in claim 2, characterized in that, The handle is equipped with a fan (4) and a battery (5) in its internal cavity. A silicone sleeve (6) is provided between the fan (4) and the inner wall of the handle cavity. The silicone sleeve (6) is used to absorb shock and protect the fan (4).

4. The high-speed bladeless handheld fan as described in claim 3, characterized in that, The fan (4) includes a high-speed motor assembly, a fan blade assembly and a functional main board. The outer surface of the silicone sleeve (6) is provided with an air passage, which is a strip-shaped groove along the wind direction.

5. The high-speed bladeless handheld fan as described in claim 3, characterized in that, There is a second annular gap between the battery (5) and the inner wall of the handle, and the second annular gap is connected to the first air outlet.

6. The high-speed bladeless handheld fan as described in claim 4, characterized in that, A main control board (8) is fixedly installed inside the air passage, and the main control board (8) is connected to the switch button set on the upper cover (1).

7. The high-speed bladeless handheld fan as described in claim 1, characterized in that, The air inlet cap (3) has an air inlet mesh (31), which is the first air inlet.

8. The high-speed bladeless handheld fan as described in claim 1, characterized in that, The bend between the inner wall of the air inlet (211) and the outer shell of the lower cover (212) is provided with an annular long inclined surface (2111). The inner wall of the air inlet (211) is in the shape of an outward flared mouth, and the hollow part of the inner wall of the air inlet (211) forms a second air inlet.

9. The high-speed bladeless handheld fan as described in claim 6, characterized in that, The main control board (8) is connected to the battery (5) and the fan (4) via wires.

10. The high-speed bladeless handheld fan as described in claim 6, characterized in that, It also includes a bracket (7), which is disposed in the internal cavity of the handle portion. The bracket (7) has a fan position for fixing the fan (4), a battery position for fixing the battery (5), and a main control board position for fixing the main control board (8). The main control board position is located on the airflow channel formed between the battery (5) and the inner wall of the handle portion. The incoming airflow carries away the working heat generated by the battery (5) and the main control board (8) and blows it out from the first air outlet.

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