Drainage type handheld fan

Abstract

The drainage type handheld fan comprises a shell, the lower portion of the shell is provided with a driving device used for generating airflow and a main channel allowing the airflow to pass through, and the upper portion of the shell is provided with an inner air outlet channel and an outer air outlet channel which communicate with the main channel. An inner air outlet corresponding to the inner air outlet channel and an outer air outlet corresponding to the outer air outlet channel are formed in the front side of the upper portion of the shell, and an inner drainage channel and an outer drainage channel which are through front and back are further formed in the upper portion of the shell. The front end opening of the inner drainage channel is located on the inner side of the inner air outlet so that airflow blown out of the inner air outlet can drive airflow in the inner drainage channel to flow in the same direction. The front end opening of the outer drainage channel is located between the inner air outlet and the outer air outlet so that airflow blown out of the two air outlets can jointly drive airflow in the outer drainage channel to flow in the same direction, and the drainage type handheld fan aims at overcoming the defects in the prior art, improves the air outlet amount and is softer and more uniform in air outlet.

Description

Technical Field

[0001] This invention specifically relates to a flow-guiding handheld fan. Background Technology

[0002] With the rapid development of portable electronic devices, handheld fans have become widely used in daily life, outdoor activities, and personal cooling scenarios due to their lightweight, portability, and flexibility. Traditional handheld fans typically use a motor to drive the fan blades, blowing air directly through an outlet on the casing. However, these fans generally suffer from problems such as concentrated airflow, harsh airflow, and limited coverage, leading to discomfort and a poor user experience after prolonged use. Furthermore, limited by size and battery capacity, traditional handheld fans have relatively low-powered motors, resulting in limited actual airflow and difficulty meeting efficient cooling requirements. To increase airflow, some products enhance air delivery by increasing motor speed or fan blade size, but this often leads to increased noise, higher power consumption, and a bulkier structure, ultimately reducing portability and comfort.

[0003] This invention was developed precisely because of the aforementioned shortcomings. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flow-guiding handheld fan that increases air volume and provides a softer and more uniform airflow.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a handheld fan with airflow generation, comprising a housing. The lower part of the housing is provided with a drive device for generating airflow and a main channel for airflow passage. The upper part of the housing is provided with an inner air outlet channel and an outer air outlet channel communicating with the main channel. The front side of the upper part of the housing is provided with an inner air outlet corresponding to the inner air outlet channel and an outer air outlet corresponding to the outer air outlet channel. The upper part of the housing is also provided with an inner airflow channel and an outer airflow channel that run through the front and back. The front end of the inner airflow channel is located inside the inner air outlet so that the airflow blown out of the inner air outlet can drive the airflow in the inner airflow channel to flow in the same direction. The front end of the outer airflow channel is located between the inner air outlet and the outer air outlet so that the airflow blown out of the two air outlets can jointly drive the airflow in the outer airflow channel to flow in the same direction.

[0007] As described above, the housing of the handheld fan with airflow control includes a handle portion at the bottom, an inner ring portion and an outer ring portion at the top. The inner ring portion encloses and forms the inner airflow channel, and the gap between the inner ring portion and the outer ring portion forms the outer airflow channel. The inner air outlet is opened on the inner side of the inner ring portion and matches the shape of the inner ring portion. The inner air outlet is opened on the front side of the inner ring portion. The outer air outlet is opened between the inner ring portion and the outer ring portion and matches the shape of the outer ring portion. The outer air outlet is opened on the front side of the outer ring portion.

[0008] As described above, the internal air outlet and the external air outlet are both annular structures extending circumferentially, or multiple air outlets distributed circumferentially.

[0009] As described above, the internal air outlet channel includes a first front half located on the front side and a first rear half located on the rear side; the internal air outlet is connected to the first front half, wherein the cross-sectional area of ​​at least the first front half gradually decreases from back to front.

[0010] As described above, the airflow-generating handheld fan includes a second front section located on the front side and a second rear section located on the rear side, and the air outlet is connected to the second front section, wherein the cross-sectional area of ​​at least the second front section gradually decreases from back to front.

[0011] As described above, the airflow-guided handheld fan has an airflow guide platform inside the housing, which extends from the inner air outlet channel to the main channel; the airflow guide platform is larger at the top and smaller at the bottom, forming a V shape, and its two sides are concave arc-shaped.

[0012] As described above, the airflow-generating handheld fan has a guide plate inside the housing, which is located between the inner air outlet channel and the outer air outlet channel and is bent towards the main channel.

[0013] As described above, in the flow-generating handheld fan, the drive unit is located within the main channel, which also contains a battery and a control module.

[0014] As described above, the bottom of the handle of the handheld fan is provided with an air inlet that communicates with the main channel.

[0015] As described above, the housing of the handheld fan is composed of a front cover and a rear cover connected and joined together by a detachable connection structure.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Achieving highly efficient jet flow enhancement significantly improves air volume and energy efficiency ratio. By setting up internal and external flow channels in front of the internal and external air outlets, the negative pressure jet effect generated by high-speed dynamic airflow actively induces surrounding air to flow from back to front and participate in the air outlet, forming a "small-to-large" airflow amplification effect. Without increasing motor power, it effectively increases the overall air volume, improves wind energy utilization efficiency, and extends battery life.

[0018] 2. The airflow is uniform and gentle, with a natural and comfortable feel. It adopts a ring-shaped double-layer air outlet structure (inner air outlet and outer air outlet) and a multi-layer air diversion channel, which allows the dynamic airflow and the diverted airflow to mix fully in front. This avoids the problems of concentrated airflow and sudden changes in air pressure in traditional fans, and achieves a 360° surround, low turbulence, and impact-free gentle wind experience. The wind feel is closer to natural wind, improving user comfort.

[0019] 3. The structure is highly integrated, combining heat dissipation and maintainability. The main channel is used for air intake, placement of drive devices, batteries and control modules, and actively heats electrical components by introducing airflow through the air inlet, realizing the integrated design of air duct and thermal management. The housing adopts a front and rear detachable structure, which is convenient for assembly, cleaning and maintenance, taking into account both performance optimization and production practicality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of the airflow-generating handheld fan of the present invention;

[0021] Figure 2 This is a schematic diagram of the rear structure of the airflow-generating handheld fan of the present invention;

[0022] Figure 3 This is a cross-sectional schematic diagram of the airflow-generating handheld fan of the present invention;

[0023] Figure 4 This is a cross-sectional schematic diagram of the airflow-generating handheld fan of the present invention;

[0024] Figure 5 This is an exploded view of the airflow-generating handheld fan of the present invention. Detailed Implementation

[0025] The invention will be further described below with reference to the accompanying drawings:

[0026] The orientations described in this invention specification, such as "up," "down," "left," "right," "front," and "back," are based on the orientations in the accompanying drawings and are intended to facilitate the description of the relationships between the various components. They do not indicate the unique or absolute positional relationships between the various components, but are merely one embodiment of the invention and are not a limitation on its implementation.

[0027] This embodiment introduces a flow-guiding handheld fan, such as... Figure 1 and Figure 2 As shown, the device includes a housing 1. The housing 1 generally has a handle 14 at the bottom and a fan disc at the top. Of course, it can also be made with identical upper and lower shapes. For ease of production and disassembly, the housing 1 is composed of a front housing 1a and a rear housing 1b connected by a detachable connection structure. The housing 1 can also be a one-piece structure, depending on the manufacturing process. Figure 3 As shown, the lower part of the housing 1 is provided with a drive device 11 for generating airflow and a main channel 10 for airflow passage. The main channel 10 is mainly arranged in the lower part of the housing and is used for airflow entry and the arrangement of electrical components, including the drive device 11, which generally uses a small motor or electric motor in conjunction with a spiral blade to generate airflow in the main channel during operation. The upper part of the housing 1 is provided with an inner air outlet channel 20 and an outer air outlet channel 30 connected to the main channel 10. The front side of the upper part of the housing 1 is provided with an inner air outlet 12 corresponding to the inner air outlet channel 20 and an outer air outlet 13 corresponding to the outer air outlet channel 30. The upper part of the housing 1 is also provided with an inner drainage channel 40 and an outer drainage channel 50 that run through the front and back. From the front view, the inner... The airflow channel 40 is located in the center, with an inner air outlet 12, an outer airflow channel 50, and an outer air outlet 13 distributed sequentially from the center outwards. According to Bernoulli's principle, an increase in flow velocity leads to a decrease in pressure in that area, thus creating negative pressure in front of the inner air outlet 12 and the outer air outlet 13, thereby triggering an ejection effect. This causes nearby air to be drawn in, forming an airflow in the same direction. The front end of the inner airflow channel 40 is located inside the inner air outlet 12 so that the airflow from the inner air outlet 12 can drive the airflow in the inner airflow channel 40 to flow in the same direction. The front end of the outer airflow channel 50 is located between the inner air outlet 12 and the outer air outlet 13 so that the airflow from both outlets can jointly drive the airflow in the outer airflow channel 50 to flow in the same direction. Figure 1 , Figure 2 and Figure 4As shown, the fan's own kinetic airflows P1 and P2 are blown out from the inner air outlet 12 and the outer air outlet 13. Through the diversion effect, air located behind the fan can simultaneously flow from back to front through the inner diversion channel 40 and the outer diversion channel 50, forming diversion airflows Q1 and Q2. These diversion airflows mix with the kinetic airflow at the front before being blown out, resulting in a more uniform and natural airflow. The core of this diversion-type handheld fan lies in using a high-speed jet of kinetic airflow to create a localized low-pressure zone in front of the air outlet. Based on the ejector effect and Bernoulli's equation in fluid mechanics, this induces surrounding still or low-speed air to be drawn in and accelerated, thus achieving a "small-to-large" airflow amplification effect. Specifically, the high-speed airflows P1 and P2 ejected from the inner air outlet 12 and the outer air outlet 13 create a negative pressure zone in front of their outlets, causing the ambient air behind to flow forward through the inner diversion channel 40 and the outer diversion channel 50, respectively, forming passive airflows Q1 and Q2. Because the airflow direction is consistent, the dynamic airflow and the guiding airflow are fully mixed at the air outlet, which significantly increases the overall air volume and reduces the local abrupt change in airflow speed, making the airflow softer and the coverage wider.

[0028] Detailed structure as follows Figures 1 to 3 As shown, the housing 1 includes a handle portion 14 at the bottom, an inner ring portion 15 and an outer ring portion 16 at the top. The inner ring portion 15 encloses and forms the inner drainage channel 40, and the gap between the inner ring portion 15 and the outer ring portion 16 forms the outer drainage channel 50. The inner air outlet channel 20 is opened inside the inner ring portion 15 and matches the shape of the inner ring portion 15, that is, the inner ring portion 15 is annular and encloses the inner drainage channel 40. Both the inner ring portion 15 and the inner air outlet channel 20 are annular and their lower ends are connected to the handle portion 14. Similarly, the outer ring 16 surrounds the outer circumference of the inner ring 15, and a gap is left between them to form an outer airflow channel 50. Both the outer ring 16 and the outer airflow channel 30 are annular, and their lower middle ends connect to the handle 14 and the main channel 10. The inner air outlet 12 is located on the front side of the inner ring 15, and the outer airflow channel 30 is located between the inner ring 15 and the outer ring 16 and matches the shape of the outer ring 16. The outer air outlet 13 is located on the front side of the outer ring 16. This annular double-layer airflow structure design not only achieves spatial separation and orderly guidance of the airflow path, but also provides a clear flow channel boundary for the ejection effect, ensuring that the inner and outer airflow channels operate independently and do not interfere with each other, thus improving the stability and efficiency of airflow organization. At the same time, the annular layout makes the airflow coverage area larger, avoiding the "wind column feeling" caused by traditional single-point airflow, and improving user comfort.

[0029] As a further preferred option, such as Figure 2 and Figure 5As shown, a guide platform 17 is provided inside the housing 1. The guide platform 17 extends downward from the inner ring wall of the inner ring portion 15, and extends from the inner air outlet channel 20 to the main channel 10. The guide platform 17 is V-shaped, wider at the top and narrower at the bottom, and its two sides are concave arc-shaped, thereby diverting the airflow of the main channel 10 to the inner air outlet channels 20 on both sides, improving the airflow efficiency. In addition, a guide plate 18 can be provided inside the housing 1. The guide plate 18 is located between the inner air outlet channel 20 and the outer air outlet channel 30. The guide plate 18 extends from the inner ring of the outer ring portion 16, and the guide plate 18 is arc-shaped near the root, tangent to the inner ring of the outer ring portion 16, with the end away from the root curving towards the main channel 10. The function of the air guide 17 is to effectively distribute the concentrated airflow generated by the drive device 11 in the main channel 10 to the inner air outlet channel 20. Its V-shaped structure and concave arc-shaped side can reduce airflow separation and vortex loss, achieving a smooth transition and uniform flow distribution. The air guide plate 18 plays the role of airflow guidance and isolation, preventing airflow from interfering with each other between the inner and outer air outlet channels. At the same time, its arc-shaped starting section and curved end design help to follow the airflow trajectory, reduce flow resistance, and further improve the overall airflow efficiency.

[0030] As a preferred option, such as Figure 1 As shown, both the inner air outlet 12 and the outer air outlet 13 are annular structures extending circumferentially, or multiple air outlets distributed circumferentially. This makes the airflow more uniform. The annular air outlet design can achieve 360° circumferential airflow, eliminating directional blind spots, and is particularly suitable for multi-angle air supply needs in handheld usage scenarios. If multiple discrete air outlets are used, specific air pressure and airflow distribution can be achieved through optimization of the aperture and spacing, balancing structural strength and ventilation performance.

[0031] As a preferred option, such as Figure 4 and Figure 5As shown, the internal air outlet duct 20 includes a first front section 201 located at the front and a first rear section 202 located at the rear; the internal air outlet 12 is connected to the first front section 201, wherein the cross-sectional area of ​​at least the first front section 201 gradually decreases from back to front. According to the Venturi effect, when fluid passes through a converging duct, the flow velocity increases and the pressure decreases, increasing the flow velocity at the outlet, which, combined with the aforementioned jet effect, improves the efficiency of airflow. Similarly, the external air outlet duct 30 includes a second front section 301 located at the front and a second rear section 302 located at the rear; the external air outlet 13 is connected to the second front section 301, wherein the cross-sectional area of ​​at least the second front section 301 gradually decreases from back to front. This converging duct design is based on the Venturi effect, that is, when airflow passes through a channel with a gradually decreasing cross-section, according to the continuity equation and the law of conservation of energy, the flow velocity increases and the static pressure decreases, thereby forming a high-speed jet at the outlet. High-speed jets are the key driving force for the efficient occurrence of the ejection effect. By implementing a tapering design on the front half of the inner and outer air channels respectively, the speed and pressure characteristics of the two dynamic airflows can be precisely controlled, enabling them to produce a synergistic ejection effect at different radius positions and enhancing the overall airflow capacity.

[0032] As a preferred option, such as Figure 3 and Figure 5 As shown, the drive device 11 is disposed within the main channel 10, which also houses the battery 21 and the control module 22. The bottom of the handle portion 14 has an air inlet 19 communicating with the main channel 10, allowing the airflow in the main channel 10 to simultaneously dissipate heat from electrical components such as the control module 22 and the drive device 11. This design cleverly combines the fan's airflow path with the heat dissipation requirements of the electrical components, utilizing the natural airflow in the main channel 10 to actively cool the battery 21, control module 22, and drive device 11. This effectively prevents temperature rise issues caused by prolonged operation, extends the lifespan of electronic components, and improves product safety and reliability. Simultaneously, the integrated airflow layout saves space, avoiding the need for additional cooling fans or ventilation holes, contributing to the achievement of lightweight and miniaturized design goals.

[0033] This handheld fan utilizes an innovative dual-layer air outlet structure and a synergistic design of internal and external airflow channels, combining the Venturi effect and the ejection principle to achieve highly efficient airflow with "low power drive and high air volume output." It boasts the following outstanding advantages: a gentle and natural breeze; the airflow speed is uniform after the dynamic airflow and the induced airflow mix, without a strong impact, closely resembling the experience of natural wind; a wide airflow range; the annular dual-layer air outlet combined with circumferential airflow achieves three-dimensional surround airflow with a large coverage angle; high energy efficiency; the ejection effect amplifies the total airflow, reduces energy consumption per unit airflow, and extends battery life; a compact and reasonable structure; the integrated air duct design and shared airflow path for electrical heat dissipation improve space utilization; and ease of manufacturing and maintenance; the modular shell structure supports quick disassembly and assembly, facilitating cleaning and repair.

[0034] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A handheld fan with airflow regulation, characterized in that: Includes a housing (1), the lower part of which is provided with a driving device (11) for generating airflow and a main channel (10) for airflow passage, the upper part of which is provided with an inner air outlet channel (20) and an outer air outlet channel (30) communicating with the main channel (10), the front side of the upper part of the housing (1) is provided with an inner air outlet (12) corresponding to the inner air outlet channel (20) and an outer air outlet (13) corresponding to the outer air outlet channel (30), and the upper part of the housing (1) is also provided with a front The inner drainage channel (40) and the outer drainage channel (50) are connected by a rear-through structure. The front end of the inner drainage channel (40) is located inside the inner air outlet (12) so that the airflow blown out of the inner air outlet (12) can drive the airflow in the inner drainage channel (40) to flow in the same direction. The front end of the outer drainage channel (50) is located between the inner air outlet (12) and the outer air outlet (13) so that the airflow blown out of the two air outlets can jointly drive the airflow in the outer drainage channel (50) to flow in the same direction.

2. The handheld fan with airflow control according to claim 1, characterized in that: The housing (1) includes a handle portion (14) at the lower part, an inner ring portion (15) and an outer ring portion (16) at the upper part. The inner ring portion (15) encloses and forms the inner drainage channel (40). The gap between the inner ring portion (15) and the outer ring portion (16) forms the outer drainage channel (50). The inner air outlet channel (20) is opened on the inner side of the inner ring portion (15) and matches the shape of the inner ring portion (15). The inner air outlet (12) is opened on the front side of the inner ring portion (15). The outer air outlet channel (30) is opened between the inner ring portion (15) and the outer ring portion (16) and matches the shape of the outer ring portion (16). The outer air outlet (13) is opened on the front side of the outer ring portion (16).

3. The handheld fan with airflow regulation according to any one of claims 1 or 2, characterized in that: The inner air outlet (12) and the outer air outlet (13) are both annular structures extending in the circumferential direction, or multiple air outlets distributed in the circumferential direction.

4. The handheld fan with airflow regulation according to any one of claims 1 or 2, characterized in that: The internal air outlet duct (20) includes a first front section (201) located on the front side and a first rear section (202) located on the rear side; the internal air outlet (12) is connected to the first front section (201), wherein the cross-sectional area of ​​at least the first front section (201) gradually decreases from rear to front.

5. The handheld fan with airflow regulation according to any one of claims 1 or 2, characterized in that: The outgoing air duct (30) includes a second front section (301) located on the front side and a second rear section (302) located on the rear side. The outgoing air outlet (13) is connected to the second front section (301). The cross-sectional area of ​​at least the second front section (301) gradually decreases from back to front.

6. The handheld fan with airflow control according to claim 2, characterized in that: The housing (1) is provided with a flow guide platform (17), which extends from the inner air outlet channel (20) to the main channel (10); the flow guide platform (17) is larger at the top and smaller at the bottom, in a V shape, and its two sides are concave arc-shaped.

7. The handheld fan with airflow control according to claim 2, characterized in that: The housing (1) is provided with a guide plate (18), which is located between the inner air outlet channel (20) and the outer air outlet channel (30) and is bent toward the main channel (10).

8. The handheld fan with airflow control according to claim 2, characterized in that: The drive device (11) is located in the main channel (10), and the main channel (10) is also equipped with a battery and a control module.

9. The handheld fan with airflow control according to claim 8, characterized in that: The bottom of the handle (14) is provided with an air inlet (19) that communicates with the main channel (10).

10. The handheld fan with airflow control according to claim 2, characterized in that: The shell (1) is composed of a front shell cover (1a) and a rear shell cover (1b) connected and joined together by a detachable connection structure.

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