Portable fan

Abstract

The application belongs to the field of fans and relates to a portable fan, which comprises a shell and centrifugal fan blades; the shell has a fan compartment and a main plate compartment arranged in parallel and an air inlet and an air outlet both in communication with the fan compartment, and the centrifugal fan blades are arranged in the fan compartment; the shell further has a volute tongue and a flow guide tongue arranged at intervals on the inner circumferential wall of the fan compartment, the volute tongue is arranged close to the air outlet, and the volute tongue and the flow guide tongue are arranged on two opposite compartment walls of the fan compartment; the diameter Phi1 of the centrifugal fan blades satisfies 40mm<=Phi1<=50mm; the ratio L1 / L2 of the distance L1 between the volute tongue and the centrifugal fan blades to the distance L2 between the flow guide tongue and the centrifugal fan blades satisfies 1 / 14<=L1 / L2<=3 / 4; and the ratio S1 / S2 of the cross-sectional area S1 of the fan compartment to the cross-sectional area S2 of the main plate compartment satisfies S1 / S2<=4 / 1. Through the above arrangement, the size of the centrifugal fan blades and the shell can be effectively reduced, and the size of the portable fan can be effectively reduced, so that the portable fan is convenient to carry.

Description

Technical Field

[0001] This application relates to the field of fan technology, and more specifically, to a portable fan. Background Technology

[0002] With the iterative updates of portable fans, portable fans with additional wearable structures such as lanyards and clips have appeared on the market. For example, a portable fan can be hung around a user's neck via a lanyard, and the fan blows air upwards onto the user. However, portable fans are usually quite large, making them inconvenient to carry, thus requiring urgent improvement. Utility Model Content

[0003] Therefore, it is necessary to provide a portable fan that can effectively reduce the size of the portable fan to make it easy to carry.

[0004] The embodiments of this application achieve the above objectives through the following technical solutions.

[0005] This application provides a portable fan, which includes a housing and centrifugal fan blades; wherein, the housing has a fan compartment and a main board compartment arranged in parallel, and an air inlet and an air outlet both communicating with the fan compartment, the centrifugal fan blades are disposed in the fan compartment, the air inlet is located in the axial direction of the centrifugal fan blades, and the air outlet is located in the radial direction of the centrifugal fan blades;

[0006] The housing also has a volute tongue and a guide tongue spaced apart on the inner peripheral wall of the fan compartment. The volute tongue is located close to the air outlet, and the volute tongue and the guide tongue are located on two opposing walls of the fan compartment.

[0007] The diameter Φ1 of the centrifugal fan blades satisfies: 40mm≦Φ1≦50mm;

[0008] The ratio L1 / L2 of the distance between the volute tongue and the centrifugal fan blade to the distance L2 between the guide tongue and the centrifugal fan blade satisfies: 1 / 14≤L1 / L2≤3 / 4;

[0009] The ratio S1 / S2 of the cross-sectional area S1 of the fan compartment to the cross-sectional area S2 of the main board compartment satisfies: S1 / S2≦4 / 1, where the cross-sectional area is the cross-sectional area along the radial direction of the centrifugal fan blade.

[0010] In one embodiment, the distance L1 between the volute tongue and the centrifugal fan blade satisfies: 0.5mm≤L1≤3mm; and / or, the distance L2 between the guide tongue and the centrifugal fan blade satisfies: 4mm≤L2≤7mm.

[0011] In one embodiment, the cross-sectional area S1 of the wind turbine nacelle satisfies: 2300 mm². 2 ≤S1≤2800mm 2 ; and / or, the cross-sectional area S2 of the motherboard compartment satisfies: 700mm² 2 ≤S2≤800mm 2 .

[0012] In one embodiment, the distance L3 between the wall of the air outlet and the centrifugal fan blade and the distance L2 between the guide tongue and the centrifugal fan blade satisfy: L3 > L2.

[0013] In one embodiment, the air outlet is located on the side of the fan compartment away from the main board compartment, and the distance L3 between the compartment wall where the air outlet is located and the centrifugal fan blade satisfies: 6mm≤L3≤8.5mm.

[0014] In one embodiment, the housing further includes a battery compartment located on the same side as the wind turbine compartment and the motherboard compartment, wherein the depth of the wind turbine compartment is H1, the depth of the motherboard compartment is H2, and the depth of the battery compartment is H3, and satisfies: H1=H2, 1 / 3≤H3 / H1≤1 / 2.

[0015] In one embodiment, the axial portion of the centrifugal fan blade protrudes into the air inlet.

[0016] In one embodiment, the distance L4 between the centrifugal fan blades and the wall of the fan housing facing the air outlet satisfies: L1 <L4<L2,3mm≤L4≤4mm。

[0017] In one embodiment, the portable fan further includes a bracket detachably connected to the housing, the ratio of the thickness t1 of the bracket to the thickness t2 of the housing being t1 / t2, which satisfies: 1 / 5.5≤t1 / t2≤1 / 2.

[0018] In one embodiment, the thickness t1 of the bracket satisfies: 5mm≤t1≤14mm; the thickness t2 of the shell satisfies: t2≤30mm.

[0019] Compared with the prior art, the embodiments of this application have the following advantages: By setting the diameter Φ1 of the centrifugal fan blade to satisfy: 40mm≦Φ1≦50mm, the ratio L1 / L2 of the distance between the volute tongue and the centrifugal fan blade to the distance L2 of the guide tongue to the centrifugal fan blade to satisfy: 1 / 14≤L1 / L2≤3 / 4, and the ratio S1 / S2 of the cross-sectional area S1 of the fan compartment to the cross-sectional area S2 of the main board compartment to satisfy: S1 / S2≦4 / 1, the size of the centrifugal fan blade and the housing can be effectively reduced, thereby effectively reducing the size of the portable fan and making the portable fan easy to carry. Attached Figure Description

[0020] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a portable fan according to one embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the internal structure of a portable fan according to an embodiment of this application;

[0023] Figure 3 This is a cross-sectional view of the shell in one embodiment of this application;

[0024] Figure 4 This is a schematic diagram showing the structure of the middle frame, back cover, battery, drive unit, main control board and centrifugal fan wheel separated in one embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of a centrifugal fan blade in one embodiment of this application;

[0026] Figure 6 yes Figure 5 Another structural diagram from a different perspective;

[0027] Figure 7 This is a schematic diagram of the middle frame in one embodiment of this application.

[0028] Figure label:

[0029] 100. Portable fan; 10. Housing; 10a. Fan compartment; 10b. Mainboard compartment; 10c. Air inlet; 10d. Air outlet; 10e. Battery compartment; 10f. First cable tray; 10g. Second cable tray; 10h. Cable channel; 101. Shaft; 102. Volute; 103. Guide tongue; 11. Middle frame; 12. Front cover; 121. Air inlet filter plate; 13. Rear cover; 20. Centrifugal fan blade; 21. Hub; 211. Boss; 22. Blade; 23. Ring frame; 24. Baffle; 30. Main control board; 40. Motor; 41. Stator; 42. Rotor; 50. Battery; 60. Bracket. Detailed Implementation

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In this application, by ensuring that the diameter Φ1 of the centrifugal fan blades is 40mm≦Φ1≦50mm, the size of the centrifugal fan blades can be effectively reduced. In addition, the ratio of the distance L1 between the volute tongue and the centrifugal fan blades to the distance L2 between the guide tongue and the centrifugal fan blades, L1 / L2, satisfies 1 / 14≤L1 / L2≤3 / 4, and the ratio of the cross-sectional area S1 of the fan compartment to the cross-sectional area S2 of the main board compartment, S1 / S2, satisfies S1 / S2≦4 / 1, the size of the centrifugal fan blades and the housing can be effectively reduced, thereby effectively reducing the size of the portable fan and making it easier to carry.

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0034] Please see Figures 1 to 4This application provides a portable fan 100, which includes a housing 10, centrifugal fan blades 20, a main control board 30, and a motor 40.

[0035] The shell 10 can have many shapes, including cuboid, cylindrical, prismatic, and other regular shapes, or other irregular shapes. No specific limitation is made here.

[0036] There are many ways to form the housing 10. In this embodiment, the housing 10 is integrally formed by injection molding, 3D printing, or other methods. This design not only enhances the structural strength and sealing performance of the housing 10, but also allows for the one-time processing of all parts of the housing 10. In other embodiments, the housing 10 can also be formed by connecting multiple housing parts. "Multiple" in this context refers to at least two. These multiple housing parts can be fixed together by methods such as bonding or welding, or they can be fixed together by methods such as snap-fit, magnetic connection, or fastener connection.

[0037] The housing 10 provides mounting positions for centrifugal fan blades 20, main control board 30, motor 40, and other components. The housing 10 has a fan compartment 10a and a main board compartment 10b arranged in parallel, and an air inlet 10c and an air outlet 10d, both connected to the fan compartment 10a. The centrifugal fan blades 20 are located within the fan compartment 10a. The air inlet 10c is located axially on the centrifugal fan blades 20, and the air outlet 10d is located radially on the centrifugal fan blades 20. Furthermore, the air inlet 10c is located on the front side of the housing 10, and the air outlet 10d is located at the upper end of the housing 10 and extends in the left-right direction, thereby achieving front-side air intake and upper-side air exhaust under the action of the centrifugal fan blades 20.

[0038] Specifically, please refer to Figures 2 to 4 The housing 10 has a shaft cylinder 101 located inside the fan compartment 10a. The shaft cylinder 101 is hollow. The centrifugal fan blade 20 includes a hub 21 and a plurality of blades 22 spaced apart along the outer peripheral wall of the hub 21. The centrifugal fan blade 20 is rotatably connected to the shaft cylinder 101 via a rotating shaft (not shown). The motor 40 includes a stator 41 and a rotor 42. The stator 41 is fitted around the outer periphery of the shaft cylinder 101. The outer peripheral wall of the rotor 42 mates with the inner peripheral wall of the hub 21, and the rotor 42 is arranged around the stator 41. This arrangement allows the shaft cylinder 101, rotating shaft, stator 41, and rotor 42 to be housed within the hub 21, resulting in a compact layout. This reduces the size of the housing 10 in the axial direction of the centrifugal fan blade 20, which is beneficial for the miniaturization of the portable fan 100.

[0039] Further, please refer to Figure 2 , Figure 3 , Figure 5 as well as Figure 6The centrifugal fan blade 20 also includes a ring frame 23 and an annular baffle 24. The ring frame 23 is arranged around multiple blades 22 and is connected to the outer side of the blades 22 near the air outlet 10d, which can enhance the structural strength of the centrifugal fan blade 20. The baffle 24 is arranged around the outer periphery of the hub 21 and is connected to the side of the multiple blades 22 away from the air inlet 10c, which can block the airflow drawn into the centrifugal fan blade 20 along the axial direction to prevent the airflow from generating turbulence in the fan compartment 10a after passing through the centrifugal fan blade 20 along the axial direction. The outer diameter of the baffle 24 is smaller than the diameter of the centrifugal fan blade 20.

[0040] The diameter Φ1 of the centrifugal fan blade 20 satisfies: 40mm≦Φ1≦50mm, which effectively reduces the size of the centrifugal fan blade 20. Optionally, the diameter Φ1 of the centrifugal fan blade 20 is selected from any one or a range formed by any two of 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, and 50mm.

[0041] Preferably, the diameter Φ1 of the centrifugal fan blade 20 is 46mm. This setting maximizes the wind pressure generated by the centrifugal fan blade 20 and the air volume that can be delivered when the size of the centrifugal fan blade 20 is reduced.

[0042] The housing 10 also has a volute tongue 102 and a guide tongue 103 spaced apart on the inner peripheral wall of the fan compartment 10a. The volute tongue 102 is arranged adjacent to the air outlet 10d, and the volute tongue 102 and the guide tongue 103 are respectively located on the two compartment walls of the fan compartment 10a that are arranged opposite to each other. Specifically, the volute tongue 102 is located on the left compartment wall of the fan compartment 10a, and the guide tongue 103 is located on the right compartment wall of the fan compartment 10a.

[0043] Among them, the volute tongue 102 is a curved tongue-shaped structure set near the air outlet 10d, and its core function is to prevent the airflow from circulating within the fan compartment 10a; the vertical distance between the guide tongue 103 and the air outlet 10d is greater than the vertical distance between the volute tongue 102 and the air outlet 10d, and the guide tongue 103 is a straight tongue-shaped structure extending vertically, and its core function is to guide the airflow to the air outlet 10d.

[0044] Specifically, the guide tongue 103 is formed by a portion extending vertically along the inner peripheral wall of the housing 10, which facilitates the placement of the guide tongue 103. Furthermore, the housing 10, the volute tongue 102, and the guide tongue 103 are integrally formed, thereby enhancing the structural strength of the volute tongue 102 and the guide tongue 103. Alternatively, the guide tongue 103 can also be a straight tongue-shaped structure extending slightly inclined vertically.

[0045] The ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 satisfies: 1 / 14≤L1 / L2≤3 / 4. This arrangement allows the side of the centrifugal fan blade 20 facing away from the air outlet 10d and the wall of the fan compartment 10a to form a centrifugal acceleration channel between the volute tongue 102 and the guide tongue 103. The width of the centrifugal acceleration channel increases gradually from the volute tongue 102 to the guide tongue 103. This allows the airflow driven by the centrifugal fan blade 20 to be sufficiently accelerated through the centrifugal acceleration channel, thereby enabling the portable fan 100 to output a sufficiently high wind speed while significantly reducing its size.

[0046] Optionally, the ratio L1 / L2 of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 and the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is selected from any one of 1 / 14, 1 / 13, 1 / 12, 1 / 11, 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3, 1 / 2, 2 / 3, 3 / 4 or any two of them.

[0047] Preferably, the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is L1 / L2 = 1 / 3. This setting maximizes the airflow speed generated by the centrifugal fan blade 20.

[0048] The ratio S1 / S2 of the cross-sectional area S1 of the fan compartment 10a to the cross-sectional area S2 of the main board compartment 10b satisfies: S1 / S2≦4 / 1, where the cross-sectional area is the cross-sectional area along the radial direction of the centrifugal fan blade 20. With this setting, within the limited space of the housing 10, the fan compartment 10a can be large enough, and the space of the main board compartment 10b can be sufficient to install the main control board 30.

[0049] Optionally, the ratio S1 / S2 of the cross-sectional area S1 of the fan hopper 10a to the cross-sectional area S2 of the main board hopper 10b is selected from any one of 4 / 1, 3.5 / 1, 3 / 1, 2.5 / 1, 2 / 1, 1.5 / 1, 1 / 1, or any two of them.

[0050] Preferably, the ratio of the cross-sectional area S1 of the fan housing 10a to the cross-sectional area S2 of the mainboard housing 10b is S1 / S2 = 3.5 / 1. This arrangement allows the portion of the housing 10 located between the fan housing 10a and the mainboard housing 10b to form a volute shape, and this volute-shaped portion has the best shape fit with the centrifugal fan blade 20, which is beneficial for accelerating the airflow driven by the centrifugal fan blade 20.

[0051] Through the above technical solutions, by ensuring that the diameter Φ1 of the centrifugal fan blade 20 satisfies: 40mm≦Φ1≦50mm, the ratio L1 of the distance between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 of the distance between the guide tongue 103 and the centrifugal fan blade 20 satisfies: 1 / 14≤L1 / L2≤3 / 4, and the ratio S1 of the cross-sectional area S1 of the fan compartment 10a to the cross-sectional area S2 of the main board compartment 10b satisfies: S1 / S2≦4 / 1, it is possible to effectively reduce the size of the centrifugal fan blade 20 and the housing 10, that is, to reduce the size of the portable fan 100, while ensuring that the output wind speed of the portable fan 100 is high enough.

[0052] Please see Figure 2 In one embodiment of this application, the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 satisfies: 0.5mm≤L1≤3mm; the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 satisfies: 4mm≤L2≤7mm. With this setting, the size of the housing 10 in the left-right direction can be reduced.

[0053] Optionally, the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 is selected from any one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or any combination thereof.

[0054] Optionally, the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is selected from any one of 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, or any combination thereof.

[0055] When the ratio of the distance between the volute tongue 102 and the centrifugal fan blade 20 to the distance between the guide tongue 103 and the centrifugal fan blade 20 is 1 / 3, L1 = 2mm and L2 = 6mm. This setting can reduce the size of the housing 10 in the left and right directions, and also make the airflow accelerated sufficiently as it is driven by the centrifugal fan blade 20 from the volute tongue 102 to the guide tongue 103.

[0056] Please see Figure 2 In one embodiment of this application, the cross-sectional area S1 of the wind turbine shroud 10a satisfies: 2300 mm². 2 ≤S1≤2800mm 2 The cross-sectional area S2 of the motherboard bay 10b satisfies: 700mm² 2 ≤S2≤800mm 2 This configuration reduces the cross-sectional area of ​​the fan compartment 10a and the motherboard compartment 10b.

[0057] Optionally, the cross-sectional area S1 of the wind turbine nacelle 10a is selected from 2300 mm². 2 2350mm 2 2400mm 22450mm 2 2500mm 2 2550mm 2 2600mm 2 2650mm 2 2700mm 2 2750mm 2 2800mm 2 The range formed by any one or both of them.

[0058] Optionally, the cross-sectional area S2 of the motherboard bay 10b is selected from 700mm². 2 710mm 2 720mm 2 730mm 2 740mm 2 750mm 2 760mm 2 770mm 2 780mm 2 790mm 2 800mm 2 The range formed by any one or both of them.

[0059] The ratio of the cross-sectional area S1 of the wind turbine shroud 10a to the cross-sectional area S2 of the mainboard shroud 10b is S1 / S2 = 3.5 / 1, and the cross-sectional area S1 of the wind turbine shroud 10a is 2577.78 mm². 2 The cross-sectional area S2 of motherboard bay 10b is 735.75 mm². 2 This configuration not only reduces the cross-sectional area of ​​the fan housing 10a and the motherboard housing 10b, but also allows the portion of the housing 10 located between the fan housing 10a and the motherboard housing 10b to form a volute shape.

[0060] Please see Figure 2 In one embodiment of this application, the distance L3 between the wall of the air outlet 10d and the centrifugal fan blade 20 and the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 satisfy: L3 > L2. With this setting, when the airflow passes through the guide tongue 103 and blows towards the air outlet 10d, the airflow can be blown to various positions in the extension direction of the air outlet 10d.

[0061] Specifically, the air outlet 10d is located on the side of the fan compartment 10a away from the main board compartment 10b, and the distance L3 between the compartment wall where the air outlet 10d is located and the centrifugal fan blade 20 satisfies: 6mm≤L3≤8.5mm. This setting can reduce the size of the housing 10 in the vertical direction.

[0062] Optionally, the distance L3 between the wall of the air outlet 10d and the centrifugal fan blade 20 is selected from any one or a range formed by any two of the following: 6mm, 6.3mm, 6.7mm, 7mm, 7.4mm, 7.6mm, 8mm, 8.1mm, 8.4mm, and 8.5mm.

[0063] Preferably, the distance L3 between the wall of the air outlet 10d and the centrifugal fan blade 20 is 7.67mm, so that the air velocity of the airflow blown out through the air outlet 10d can be maximized.

[0064] Please see Figures 1 to 4 as well as Figure 7 In one embodiment of this application, the housing 10 also has a battery compartment 10e located on the same side as the fan compartment 10a and the motherboard compartment 10b. The portable fan 100 also includes a battery 50, which is disposed in the battery compartment 10e. The battery 50 and the motor 40 are both electrically connected to the main control board 30. Specifically, the housing 10 also has a first cable port 10f connecting the fan compartment 10a and the battery compartment 10e, a second cable port 10g connecting the motherboard compartment 10b and the battery compartment 10e, and a cable passage 10h connecting the first cable port 10f and the second cable port 10g. The cable passage 10h is located on the wall of the battery compartment 10e near the fan compartment 10a and the motherboard compartment 10b. In this way, the motor 40 and the main control board 30 can be electrically connected by passing wires through the first cable port 10f, the cable passage 10h, and the second cable port 10g in sequence. The battery 50 and the main control board 30 can also be electrically connected by passing wires through the second cable port 10g.

[0065] Further, please refer to Figure 3 The depth of the fan compartment 10a is H1, the depth of the motherboard compartment 10b is H2, and the depth of the battery compartment 10e is H3, and the following conditions are met: H1=H2, 1 / 3≤H3 / H1≤1 / 2. This setting can reduce the size of the housing 10 in the front-to-back direction.

[0066] Optionally, the ratio H3 / H1 of the depth H3 of the battery compartment 10e to the depth H1 of the wind turbine compartment 10a is selected from any one or a range formed by any two of the following: 2 / 6, 2.1 / 6, 2.2 / 6, 2.3 / 6, 2.4 / 6, 2.5 / 6, 2.6 / 6, 2.7 / 6, 2.8 / 6, 2.9 / 6, and 3 / 6.

[0067] Preferably, the depth of the wind turbine compartment 10a is H1=18mm, the depth of the motherboard compartment 10b is H2=18mm, and the depth of the battery compartment 10e is H3=8.3mm. This arrangement makes the volume of the battery compartment 10e large enough, thereby making the capacity of the battery 50 large enough.

[0068] Please see Figure 2 , Figure 3 as well as Figure 5 , in an embodiment of the present application, a portion of the centrifugal fan blade 20 in the axial direction protrudes into the air inlet 10c, such an arrangement prevents the arrangement of the centrifugal fan blade 20 from increasing the dimension of the portable fan 100 in the front-rear direction.

[0069] Specifically, a boss 211 is protrudingly disposed on a side of the hub 21 facing the air outlet 10d, the boss 211 is located inside the air inlet 10c, one end of the rotating shaft extends into the hub 21 and is fixed inside the boss 211, the other end of the rotating shaft is rotatably connected in the shaft sleeve 101, and the boss 211 is the portion of the centrifugal fan blade 20 that protrudes in the axial direction and extends into the air inlet 10c.

[0070] Please refer to Figure 1 , in an embodiment of the present application, the distance L4 between the centrifugal fan blade 20 and the bin wall of the fan bin 10a facing the air outlet 10d satisfies: L1<L4<L2, 3mm≤L4≤4mm. Such an arrangement can ensure that the width of the above-mentioned centrifugal acceleration channel is set to increase progressively in the direction from the volute tongue 102 to the guide tongue 103.

[0071] Optionally, the distance L4 between the centrifugal fan blade 20 and the bin wall of the fan bin 10a facing the air outlet 10d is selected from any one of 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, or a range formed by any two of them.

[0072] Please refer to Figure 1 , in an embodiment of the present application, the portable fan 100 further includes a bracket 60 detachably connected to the housing 10. There are many ways for the housing 10 and the bracket 60 to be detachably connected. The housing 10 and the bracket 60 may be connected by magnetic attraction, the housing 10 and the bracket 60 may also be bonded by male and female hook and loop fasteners, the housing 10 and the bracket 60 may further be connected by a snap fit, and the housing 10 and the bracket 60 may be fixed by other detachable connection methods such as threaded screwing.

[0073] Wherein, the bracket 60 is connected with a hanging rope (not shown). The bracket 60 is hung on the user's neck through the hanging rope first, and then the housing 10 is magnetically attracted to the bracket 60, so that the portable fan 100 can be used. Obviously, the bracket 60 and the housing 10 may be directly magnetically attracted together, or the bracket 60 may be located on the inner side of the user's clothing, the housing 10 is located on the outer side of the user's clothing, and the bracket 60 and the housing 10 clamp the user's clothing when they are magnetically attracted together.

[0074] Further, please refer to Figure 1The ratio t1 / t2 of the thickness t1 of the bracket 60 to the thickness t2 of the housing 10 satisfies: 1 / 5.5≤t1 / t2≤1 / 2. This setting can effectively reduce the size of the portable fan 100 in the front-to-back direction.

[0075] Specifically, the thickness t1 of the bracket 60 satisfies: 5mm≤t1≤15mm; the thickness t2 of the shell 10 satisfies: t2≤30mm.

[0076] Optionally, the thickness of the bracket 60 is selected from any or both of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, and 15mm, and the thickness of the housing 10 is selected from any or both of 27.5mm, 28mm, 28.5mm, 29mm, 29.5mm, and 30mm.

[0077] Preferably, the thickness of the bracket 60 is t1 = 9 mm and the thickness of the housing 10 is t2 = 30 mm. This arrangement can reduce the size of the bracket 60 and the housing 10 in the front-rear direction while ensuring the structural strength of the bracket 60 and the housing 10.

[0078] Further, please refer to Figure 3 , Figure 4 as well as Figure 7 The housing 10 includes a middle frame 11, a front cover 12, and a rear cover 13. The front side of the middle frame 11 forms a fan compartment 10a and a motherboard compartment 10b that are spaced apart vertically. The rear side of the middle frame 11 forms a battery compartment 10e. The air outlet 10d is located at the top of the middle frame 11. The front cover 12 is placed on the front side of the middle frame 11 to cover the fan compartment 10a and the motherboard compartment 10b. The rear cover 13 is placed on the rear side of the middle frame 11 to cover the battery compartment 10e. The air inlet 10c is located on the front cover 12. The side of the front cover 12 facing away from the middle frame 11 is provided with an air inlet filter plate 121 to filter debris and other impurities in the airflow drawn into the housing 10. The air inlet filter plate 121 covers the air inlet 10c.

[0079] The following comparative analysis of multiple control and experimental groups further illustrates this application. In each of the following control and experimental groups, the ratio L1 / L2 of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 and the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is different. V1, V2, and V3 are the wind speeds of the portable fan 100 at the middle position of the outlet 10d in the length direction when the fan is at the first, second, and third speeds, respectively. V1', V2', and V3' are the wind speeds of the portable fan 100 at the outlet 10d near the guide tongue 103 in the length direction when the fan is at the first, second, and third speeds, respectively. The units of V1, V2, V3, V1', V2', and V3' are all m / s, and the wind speed measurement device used is an external thermal anemometer.

[0080] Table 1. Relevant parameters of portable fans

[0081]

[0082]

[0083] Please refer to Table 1. By comparing experimental groups 1 to 15 and control groups 1 to 5, it can be seen that, firstly, when the ratio L1 / L2 of the distance between the volute tongue 102 and the centrifugal fan blade 20 and the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 increases from 1 / 14 to 1 / 3, the corresponding values ​​V1, V2, V3, V1', V2', and V3' all increase; and when the diameter Φ1 of the centrifugal fan blade 20 decreases from 1 / 3 to 3 / 4, the corresponding values ​​V1, V2, V3, V1', V2', and V3' all decrease.

[0084] Second, when the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is L1 / L2 = 1 / 14 and 3 / 4, the corresponding values ​​V1, V2, V3, V1', V2', and V3' are all equivalent. Furthermore, when the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is L1 / L2 < 1 / 14 and > 3 / 4, the corresponding values ​​V1, V2, V3, V1', V2', and V3' are significantly smaller than the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20. The ratio L1 / L2 between the volute tongue 102 and the centrifugal fan blade 20, which is between 1 / 14 and 3 / 4, corresponds to V1, V2, V3, V1', V2', and V3'. This proves that the wind speed when the ratio L1 / L2 between the volute tongue 102 and the centrifugal fan blade 20 and the guide tongue 103 and the centrifugal fan blade 20 satisfies the following condition: the wind speed when 1 / 14≤L1 / L2≤3 / 4 is significantly greater than the wind speed when the ratio L1 / L2 between the volute tongue 102 and the centrifugal fan blade 20 and the guide tongue 103 and the centrifugal fan blade 20 is <1 / 14 and >3 / 4.

[0085] Third, when the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is L1 / L2 = 1 / 3, V1, V2, V3, V1', V2', and V3' are the largest. This proves that the wind speed is the largest when the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is L1 / L2 = 1 / 3.

[0086] In addition, according to measurements and calculations, when the ratio of the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 to the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is L1 / L2 = 1 / 3, the distance L1 between the volute tongue 102 and the centrifugal fan blade 20 is 2mm, and the distance L2 between the guide tongue 103 and the centrifugal fan blade 20 is 6mm; the distance L3 between the wall of the hopper where the air outlet 10d is located and the centrifugal fan blade 20 is 7.67mm, the distance L4 between the centrifugal fan blade 20 and the wall of the fan hopper 10a facing the air outlet 10d is 3.8mm, and the diameter of the centrifugal fan blade 20 is 46mm.

[0087] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A portable fan (100), characterized in that, The portable fan (100) includes a housing (10) and centrifugal fan blades (20); wherein, The housing (10) has a fan compartment (10a) and a main board compartment (10b) arranged in parallel, and an air inlet (10c) and an air outlet (10d) that are both connected to the fan compartment (10a). The centrifugal fan blade (20) is located inside the fan compartment (10a). The air inlet (10c) is located in the axial direction of the centrifugal fan blade (20), and the air outlet (10d) is located in the radial direction of the centrifugal fan blade (20). The housing (10) also has a volute tongue (102) and a guide tongue (103) spaced apart on the inner peripheral wall of the fan compartment (10a). The volute tongue (102) is arranged adjacent to the air outlet (10d), and the volute tongue (102) and the guide tongue (103) are respectively located on two compartment walls of the fan compartment (10a) that are arranged opposite to each other. The diameter Φ1 of the centrifugal fan blade (20) satisfies: 40mm≦Φ1≦50mm; The ratio L1 / L2 of the distance between the volute tongue (102) and the centrifugal fan blade (20) and the distance between the guide tongue (103) and the centrifugal fan blade (20) satisfies: 1 / 14≤L1 / L2≤3 / 4; The ratio S1 / S2 of the cross-sectional area S1 of the fan compartment (10a) and the cross-sectional area S2 of the main board compartment (10b) satisfies: S1 / S2≦4 / 1, where the cross-sectional area is the cross-sectional area along the radial direction of the centrifugal fan blade (20).

2. The portable fan (100) according to claim 1, characterized in that, The distance L1 between the volute tongue (102) and the centrifugal fan blade (20) satisfies: 0.5mm≤L1≤3mm; and / or, the distance L2 between the guide tongue (103) and the centrifugal fan blade (20) satisfies: 4mm≤L2≤7mm.

3. The portable fan (100) according to claim 1, characterized in that, The cross-sectional area S1 of the wind turbine shroud (10a) satisfies: 2300 mm² 2 ≤S1≤2800mm 2 ; and / or, the cross-sectional area S2 of the motherboard compartment (10b) satisfies: 700mm² 2 ≤S2≤800mm 2 .

4. The portable fan (100) according to claim 1, characterized in that, The distance L3 between the wall of the air outlet (10d) and the centrifugal fan blade (20) and the distance L2 between the guide tongue (103) and the centrifugal fan blade (20) satisfy: L3 > L2.

5. The portable fan (100) according to claim 4, characterized in that, The air outlet (10d) is located on the side of the fan compartment (10a) away from the main board compartment (10b), and the distance L3 between the compartment wall where the air outlet (10d) is located and the centrifugal fan blade (20) satisfies: 6mm≤L3≤8.5mm.

6. The portable fan (100) according to claim 1, characterized in that, The housing (10) also has a battery compartment (10e) located on the same side as the wind turbine compartment (10a) and the motherboard compartment (10b). The depth of the wind turbine compartment (10a) is H1, the depth of the motherboard compartment (10b) is H2, and the depth of the battery compartment (10e) is H3, and satisfies: H1=H2, 1 / 3≤H3 / H1≤1 / 2.

7. The portable fan (100) according to claim 1, characterized in that, The axial portion of the centrifugal fan blade (20) protrudes into the air inlet (10c).

8. The portable fan (100) according to claim 1, characterized in that, The distance L4 between the centrifugal fan blades (20) and the wall of the fan housing (10a) facing the air outlet (10d) satisfies: L1 <L4<L2,3mm≤L4≤4mm。 9. The portable fan (100) according to claim 1, characterized in that, The portable fan (100) also includes a bracket (60) detachably connected to the housing (10), wherein the ratio t1 of the thickness t1 of the bracket (60) to the thickness t2 of the housing (10) satisfies: 1 / 5.5≤t1 / t2≤1 / 2.

10. The portable fan (100) according to claim 9, characterized in that, The thickness t1 of the bracket (60) satisfies: 5mm≤t1≤14mm; the thickness t2 of the shell (10) satisfies: t2≤30mm.

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