Staged pressurizing mixed flow handheld fan

Abstract

The utility model relates to the technical field of fans, and discloses a staged pressurizing mixed flow handheld fan which comprises a fan head and a handle. The fan head comprises a first shell, a second shell, a motor and fan blades. The first shell comprises a first outer ring, a motor mounting seat and a first pressurizing sheet; the first outer ring, the first pressurizing sheet and the motor mounting seat form a first speed-increasing air duct; the second shell comprises a second outer ring, an air guide seat and a second pressurizing sheet; the second outer ring, the second pressurizing sheet and the air guide seat form a second speed-increasing air duct; and after airflow passes through the first speed-increasing air duct and the second speed-increasing air duct to be accelerated, the air volume and the air supply distance are increased.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and particularly relates to a staged supercharged mixed-flow handheld fan. Background Art

[0002] A handheld small fan is an electrical appliance used in daily life. It is rechargeable and portable. In hot weather or when going out, a handheld fan can be used to blow and dissipate heat.

[0003] The currently adopted handheld fans drive the fan blades to rotate through a motor. When the fan blades rotate, airflows are inhaled from the air inlet and then blown out from the air outlet to achieve cooling. By adopting the direct air outlet method, that is, the straight-in and straight-out method, there are problems of low air pressure and short air supply distance, resulting in the inability to feel the airflow blowing and ineffective cooling at a slightly longer distance.

[0004] Therefore, improvements need to be made. Summary of the Utility Model

[0005] The technical problem solved by the utility model is to provide a staged supercharged mixed-flow handheld fan to solve the problems raised in the above background art in view of the defects existing in the above prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A staged supercharging mixed-flow hand-held fan, comprising: a fan head for driving the generation of air flow and a handle connected to the fan head, wherein a driving circuit board, a battery and a control button for control are installed in the handle; the battery, the control button are electrically connected to the driving circuit board; the control button is exposed on the outer peripheral surface of the handle; the fan head includes a first housing, a second housing, a motor and a fan blade; the first housing, the first housing is located at the air inlet end; the first housing includes a first outer ring, a motor mounting seat and more than one first pressurizing piece; the motor is arranged on the motor mounting seat; the fan blade is arranged on the output end of the motor; the first pressurizing pieces are distributed on the inner wall of the first outer ring and extend to connect the outer peripheral edge of the motor mounting seat; the inner wall of the first outer ring, the first pressurizing pieces and the motor mounting seat form a first speed increasing air duct, and the first speed increasing air duct increases through the first pressurizing pieces, resulting in a smaller radial ventilation area to form pressurization and speed increase of the air flow; the second housing, the second housing is arranged at the air outlet end of the second housing; the second housing includes a second outer ring, a wind guiding seat and more than one second pressurizing piece; the second pressurizing pieces are distributed on the inner wall of the second outer ring and extend to connect the outer peripheral edge of the wind guiding seat; the second outer ring, the second pressurizing pieces and the wind guiding seat form a second speed increasing air duct, and the second speed increasing air duct increases through the second pressurizing pieces, resulting in a smaller radial ventilation area to form pressurization and speed increase of the air flow to direct the air flow out; wherein, the motor drives the fan blade to rotate to generate negative pressure at the air inlet end to direct the air flow to the first speed increasing air duct; the air flow is pressurized and guided to the second speed increasing air duct through the first pressurizing pieces on the first outer ring; the air flow is pressurized and blown out through the second pressurizing pieces in the second speed increasing air duct, so that the air flow increases the air volume and the air supply distance after passing through the first speed increasing air duct and the second speed increasing air duct.

[0007] Further, the first pressurizing pieces are distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressurizing pieces of the first speed increasing air duct reverse the air flow or guide the air flow forward to the second speed increasing air duct, achieving the functions of air flow gathering or pressurized air guiding.

[0008] Further, the motor includes a stator and a rotor, the stator is fixed on the motor mounting seat, the rotor is arranged on the fan blade, and the rotor is sleeved on the stator.

[0009] Furthermore, the motor mounting seat is provided with a convex column which extends axially and is hollow inside; the fan blades include a hub portion and blades evenly arranged on the outer circumferential surface of the hub portion, and the hub portion has a receiving portion which is recessed inwardly; the stator includes an iron core inserted on the convex column and a coil wound on the iron core; the rotor includes a rotating shaft axially arranged on the receiving portion and a magnetic ring attached to the radial inner wall of the receiving portion, and the rotating shaft is inserted in the convex column.

[0010] Furthermore, it includes an air inlet hood, which is provided with a hollow accommodating portion along the air inlet end to the air outlet end, and at least a portion of the accommodating portion extends to the first shell or the second shell; to form a package for the first shell or the first shell and the second shell, or to form a package in the first shell or the first shell and the second shell.

[0011] Furthermore, the blades of the fan blades are distributed counterclockwise from the air inlet end to the air outlet end.

[0012] Furthermore, it includes a power supply interface for providing electric power, the power supply interface is electrically connected to the driving circuit board, and the power supply interface is exposed outside the handle.

[0013] Furthermore, the air guide seat is provided with a refrigeration component at the air outlet direction, and the refrigeration component includes a semiconductor refrigeration sheet and a cold guide cover. An installation space is formed on the side of the air guide seat close to the air outlet end, and the semiconductor refrigeration sheet is arranged in the installation space. The cold guide cover is covered on the installation space and in contact with the semiconductor refrigeration sheet.

[0014] Furthermore, it comprises a decorative ring, which is embedded in the circumferential edge of the air outlet end of the second shell, and the decorative ring is provided with a radially enlarged air guide arc surface from the air inlet end to the air outlet end.

[0015] Furthermore, the air guide seat is provided with a face cover at the air outlet direction, the face cover and the air guide seat form an installation space, a digital display panel is provided in the installation space, and the digital display panel is used to display and / or control parameters.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The stage-type pressurized mixed-flow handheld fan adopts a double-speed-increasing air duct form. When the airflow passes through the first speed-increasing air duct, the first pressure plate arranged in the first speed-increasing air duct causes the radial ventilation area to become smaller, thereby pressurizing and accelerating the airflow. At the same time, the first speed-increasing air duct is located at the air inlet end, thereby being able to absorb surrounding air and increase the air volume. When the airflow passes through the second speed-increasing air duct, the second pressure plate arranged in the second speed-increasing air duct causes the radial ventilation area to become smaller, further pressurizing and accelerating the airflow in the second stage, thereby increasing the air volume and air delivery distance of the airflow.

[0018] 2. The first pressurizing pieces of the first air acceleration duct are arranged in a clockwise or counterclockwise manner, which can achieve the functions of pressurizing and concentrating the air flow or pressurizing and guiding the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural view of the present utility model.

[0020] Figure 2 It is a schematic structural view of the present utility model from another angle.

[0021] Figure 3 It is an exploded structural view of the present utility model.

[0022] Figure 4 It is an exploded structural view of the fan head.

[0023] Figure 5 It is a sectional structural view of the fan head.

[0024] Figure 6 It is a schematic structural view of the first housing.

[0025] Figure 7 It is a schematic structural view of the first housing.

[0026] Figure 8 It is a schematic structural view of the second housing.

[0027] Figure 9 It is a schematic structural view of the second housing.

[0028] Figure 10 It is a schematic structural view of the fan blade.

[0029] Figure 11 It is a schematic structural view of the rotor and the fan blade.

[0030] Figure 12 It is a schematic structural view of the stator.

[0031] Figure 13 It is a schematic structural view of the air inlet hood.

[0032] Figure 14 It is a schematic structural view of the refrigeration component.

[0033] Figure 15 It is a schematic structural view of the decorative ring.

[0034] Reference numerals: 1, fan head; 2, handle; 3, drive circuit board; 4, battery; 5, control button; 6, first housing; 7, second housing; 8, motor; 9, fan blade; 10, first outer ring; 11, motor mounting seat; 12, first pressure plate; 13, first speed-up air duct; 14, second outer ring; 15, air guide seat; 16, second pressure plate; 17, second speed-up air duct; 18, stator; 19, rotor; 20, convex column; 21, hub portion; 22, blade; 23, storage portion; 24, iron core; 25, coil; 26, rotating shaft; 27, magnetic ring; 28, air inlet cover; 29, accommodating portion; 30, power supply interface; 31, refrigeration component; 32, semiconductor refrigeration sheet; 33, heat conduction cover; 34, decorative ring; 35, air guiding arc surface. Detailed implementation mode

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0036] The embodiments described with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a number of" and "a plurality of" is two or more, unless otherwise specifically and clearly defined. In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal level than the second feature. The first feature being "below", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0037] As Figures 1-9As shown, a staged pressurized mixed-flow hand-held fan is provided, comprising: a fan head 1 for driving to generate air flow and a handle 2 connected to the fan head 1. A driving circuit board 3 for control, a battery 4 and a control button 5 are installed in the handle 2; the battery 4 and the control button 5 are electrically connected to the driving circuit board 3; the control button 5 is exposed on the outer peripheral surface of the handle 2; the fan head 1 includes a first housing 6, a second housing 7, a motor 8 and a fan blade 9; the first housing 6 is located at the air inlet end; the first housing 6 includes a first outer ring 10, a motor mounting seat 11 and more than one first pressurizing piece 12; the motor 8 is arranged on the motor mounting seat 11; the fan blade 9 is arranged at the output end of the motor 8; the first pressurizing pieces 12 are distributed on the inner wall of the first outer ring 10 and extend to connect the outer peripheral edge of the motor mounting seat 11; the inner wall of the first outer ring 10, the first pressurizing pieces 12 and the motor mounting seat 11 form a first speed-increasing air duct 13, and the first speed-increasing air duct 13 increases the radial ventilation area through the first pressurizing pieces 12 to form pressurization and speed increase of the air flow; the second housing 7 is located at the air outlet end of the second housing 7; the second housing 7 includes a second outer ring 14, a wind guiding seat 15 and more than one second pressurizing piece 16; the second pressurizing pieces 16 are distributed on the inner wall of the second outer ring 14 and extend to connect the outer peripheral edge of the wind guiding seat 15; the second outer ring 14, the second pressurizing pieces 16 and the wind guiding seat 15 form a second speed-increasing air duct 17, and the second speed-increasing air duct 17 increases the radial ventilation area through the second pressurizing pieces 16 to form pressurization and speed increase of the air flow so as to guide the air flow to blow out; wherein, the motor 8 drives the fan blade 9 to rotate to generate negative pressure at the air inlet end to guide the air flow to the first speed-increasing air duct 13; the air flow is pressurized and guided to the second speed-increasing air duct 17 through the first pressurizing pieces 12 on the first outer ring 10; the air flow is pressurized and blown out through the second pressurizing pieces 16 in the second speed-increasing air duct 17, so that the air flow increases the air volume and the air supply distance after passing through the first speed-increasing air duct 13 and the second speed-increasing air duct 17.

[0038] A staged pressurized mixed-flow hand-held fan is provided, which includes a fan head 1 and a handle 2. In practice, the fan head 1 and the handle 2 can be an integral component structure or an independent component structure. Preferably, the fan head 1 and the handle 2 are independent components, and the fan head 1 and the handle 2 are assembled and connected. Among them, the fan head 1 is mainly used to drive to generate air flow. The handle 2 is for the user to hold. Usually, a battery 4, a driving circuit board 3 and a control button 5 are installed in the handle 2; the battery 4 is used to provide power for endurance, and the driving circuit board 3 is used to set up a control circuit. Among them, one or more driving circuit boards 3 can be set up to control components, such as driving the motor 8, etc.; the control button 5 is used to turn on or off or adjust the air volume gear, etc.

[0039] like Figure 6 and Figure 7 The first shell 6 includes a motor mounting seat 11, a first pressure plate 12 and a first outer ring 10. The motor mounting seat 11 and the first outer ring 10 can be integrally formed or can be independent components. The motor mounting seat 11 can be arranged at the air inlet end or the air outlet end of the first outer ring 10. As an implementable technical method, the motor mounting seat 11 and the first outer ring 10 are integrally formed and the motor mounting seat 11 is arranged at the air outlet end of the first outer ring 10. The first pressure plate 12 can be evenly distributed or unevenly distributed between the first outer ring 10 and the motor mounting seat 11. Preferably, the first pressure plate 12 is evenly distributed on the circumference. Due to the presence of the first pressure plate 12, the radial ventilation area of ​​the airflow passing through the first outer ring 10 becomes smaller, and the first shell 6 is located at the air inlet end, and the airflow can absorb the airflow around to increase the air volume; at the same time, the airflow is pressurized to increase the airflow speed.

[0040] like Figure 8 and Figure 9 The second shell 7 includes a second outer ring 14, an air guide seat 15 and a second pressure plate 16, wherein the second outer ring 14, the air guide seat 15 and the second pressure plate 16 can be integrally formed or in the form of independent components. Preferably, the second outer ring 14, the air guide seat 15 and the second pressure plate 16 are integrally formed, and the second shell 7 can be integrally formed with the first shell 6 or the second shell 7 can be independent components of the first shell 6. The second pressure plate 16 can be evenly distributed or unevenly distributed between the second outer ring 14 and the air guide seat 15. Preferably, the second pressure plate 16 is evenly distributed around the circumference. The presence of the second pressure plate 16 in the second speed-increasing air duct 17 reduces the radial ventilation area of ​​the airflow passing through the third outer ring, further pressurizing the airflow and increasing the airflow speed.

[0041] like Figure 7 The first pressure plate 12 is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure plate 12 of the first speed increasing air duct 13 can gather the airflow in the reverse direction or guide the airflow forward to the second speed increasing air duct 17, so as to achieve the effect of gathering the airflow or pressurizing and guiding the airflow.

[0042] As a preferred technical solution, in an implementable manner, the first pressure sheet 12 is arranged in a clockwise manner. As the airflow is driven by the fan blades 9, the airflow moves centrifugally along the surrounding directions of the fan blades 9. The setting direction of the first pressure sheet 12 of the first speed-increasing air duct 13 is opposite to the direction of the airflow movement. The first pressure sheet 12 gathers the wind moving in the surrounding directions to change the flow direction of the airflow; thus, the second pressure sheet 16 guides the gathered airflow, and then the wind passing through the second speed-increasing air duct 17 is blown out in the front. Avoiding the airflow from being dispersed and blown out, resulting in air volume loss, and achieving the effect of gathering and pressurizing the air.

[0043] In another feasible embodiment, the first pressure plate 12 is arranged in a counterclockwise manner. Since the air flow is driven by the fan blades 9, the air flow moves centrifugally in the circumferential direction around the fan blades 9. The arrangement direction of the first pressure plate 12 of the first air acceleration duct 13 is the same as the direction of the air flow movement. The first pressure plate 12 guides and pressurizes the air moving in all directions, so that the second pressure plate exports the air flow. Furthermore, the air flow passing through the second air acceleration duct 17 is blown out in a frontal manner, avoiding the dispersed blowing of the air flow and causing air volume loss.

[0044] Reference Figure 3 、 Figure 4 、 Figures 10-12 As shown in, the motor 8 includes a stator 18 and a rotor 19. The stator 18 is fixed on the motor mounting base 11, the rotor 19 is arranged on the fan blades 9, and the rotor 19 is sleeved on the stator 18. In practice, the motor can adopt the form of a brushed motor or a brushless motor.

[0045] The motor mounting base 11 is provided with a convex column 20 extending axially and having a hollow interior; the fan blades 9 include a hub portion 21 and blades 22 uniformly arranged on the outer peripheral surface of the hub portion 21. The hub portion 21 has a receiving portion 23 recessed inward; the stator 18 includes an iron core 24 inserted on the convex column 20 and a coil 25 wound around the iron core 24; the rotor 19 includes a rotating shaft 26 axially arranged in the receiving portion 23 and a magnetic ring 27 attached to the radial inner wall of the receiving portion 23, and the rotating shaft 26 is inserted into the convex column 20.

[0046] Preferably, as a feasible technical solution, the motor 8 adopts an outer rotor brushless motor. Structurally, the hub portion 21 of the fan blades 9 is provided with a receiving portion 23, and the fan blades 9 are used as the installation position of the rotor 19. The magnetic ring 27 and the rotating shaft 26 of the rotor 19 are arranged at the position of the receiving portion 23. Furthermore, the structure can be optimized and the number of components can be saved. At the same time, a hollow convex column 20 is arranged on the motor mounting base 11 to facilitate the insertion of the rotating shaft 26 into the convex column 20 for positioning. At the same time, the iron core 24 and the coil 25 of the stator 18 can be sleeved on the convex column 20 for positioning. The fan blades 9 are driven through the designed outer rotor brushless motor structure, and the structure can be made more compact and the number of components can be saved, thereby reducing costs.

[0047] Such as Figure 13As shown in the figure, the utility model includes an air inlet hood 28. The air inlet hood 28 is provided with a hollow accommodating portion 29 along the air inlet end to the air outlet end, and at least a part of the accommodating portion 29 extends to the first housing 6 or the second housing 7, so as to form a structure that wraps the first housing 6 or the first housing 6 and the second housing 7, or to form a structure that is accommodated in the first housing 6 or the first housing 6 and the second housing 7.

[0048] In a further technical solution, an air inlet hood 28 is added. The air inlet hood 28 is of a hollow structure to form an accommodating portion 29. The air inlet hood 28 can be arranged on one side of the first housing 6. In the first implementation, the air inlet hood 28 can accommodate the first housing 6 and the second housing 7 through the accommodating portion 29; in the second implementation, the air inlet hood 28 can accommodate the first housing 6; in the third implementation, the accommodating portion 29 of the air inlet hood 28 can be accommodated in the first housing 6 or the second housing 7; in the fourth implementation, the accommodating portion 29 of the air inlet hood 28 can be accommodated in the first housing 6. Preferably, the fourth implementation mode is adopted in the utility model. The air inlet hood 28 is provided with an air inlet grille at the air inlet end. The air inlet grille includes connecting bars evenly distributed in a circumferential direction. The connecting bars extend radially and are connected to the inner wall of the air inlet hood 28 to form a gap for preventing foreign objects from entering. The air inlet grille is not drawn in the drawings.

[0049] Preferably, the blades 22 of the fan blade 9 are distributed counterclockwise from the air inlet end to the air outlet end.

[0050] Preferably, the utility model further includes a power supply interface 30 for providing power. The power supply interface 30 is electrically connected to the drive circuit board 3, and the power supply interface 30 is exposed outside the handle 2. Among them, the power supply interface 30 can be used as a connecting wire, such as being powered by connecting a plug to a socket, or being electrically connected to a battery 4 for power supply.

[0051] Referring to Figure 14 , a refrigeration component 31 is provided at the air outlet direction position of the air guide seat 15. The refrigeration component 31 includes a semiconductor refrigeration chip 32 and a heat conduction cover 33. An installation space is formed on one side of the air guide seat 15 close to the air outlet end. The semiconductor refrigeration chip 32 is arranged in the installation space, and the heat conduction cover 33 covers the installation space and is in contact with the semiconductor refrigeration chip 32.

[0052] The refrigeration component 31 can be composed of a semiconductor refrigeration plate 32 and a cold cover 33. For the convenience of installation, an installation space is set on the air guide seat 15. The installation space is formed as a recess. The refrigeration component 31 is set in the installation space. The cold surface of the refrigeration component 31 contacts the cold cover 33 for heat transfer. When the airflow is blown out from the second speed increasing air duct 17, under the cooling and cooling of the refrigeration component 31, the temperature at the position of the air guide seat 15 is low. After the airflow is blown out, it cools the airflow, which can improve the cooling effect on the user. At the same time, after the heat transfer between the cold cover 33 and the semiconductor refrigeration plate 32 and the user's skin, it can bring a cool cooling experience to the customer. It has the advantages of rich usage methods and good cooling effect.

[0053] Specifically, refer to Figure 15 The utility model further comprises a decorative ring 34, which is embedded in the circumferential edge of the air outlet end of the second shell 7, and the decorative ring 34 is provided with a radially enlarged air guide arc surface 35 from the air inlet end to the air outlet end.

[0054] The decorative ring 34 serves as a decoration on one hand, and guides the airflow after the air is discharged by utilizing the air guide arc surface 35 designed thereon to control the direction of the airflow.

[0055] The air guide seat 15 is provided with a surface cover at the air outlet direction, and the surface cover and the air guide seat 15 form an installation space. A digital display panel is provided in the installation space, and the digital display panel is used to display and / or control parameters.

[0056] In another embodiment, the digital display panel can be used to display the power of the battery 4, the wind speed gear and other functions. The digital display panel is arranged at the end surface of the second housing 7, which is convenient for adjustment and control and more convenient to use.

[0057] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A staged supercharging mixed-flow handheld fan, characterized in that, Comprising: A fan head for driving and generating an air flow, and a handle connected to the fan head. A driving circuit board for control, a battery, and a control button are installed in the handle; the battery and the control button are electrically connected to the driving circuit board; the control button is exposed on the outer peripheral surface of the handle; The fan head includes a first housing, a second housing, a motor, and a fan blade; The first housing, which is located at the air inlet end; the first housing includes a first outer ring, a motor mounting seat, and more than one first pressure piece; the motor is arranged on the motor mounting seat; the fan blade is arranged on the output end of the motor; the first pressure pieces are distributed on the inner wall of the first outer ring and extend to connect the outer periphery of the motor mounting seat; the inner wall of the first outer ring, the first pressure pieces, and the motor mounting seat form a first speed-up air duct, and the first speed-up air duct increases through the first pressure pieces, resulting in a smaller radial ventilation area to pressurize and speed up the air flow; The second housing, which is arranged at the air outlet end of the second housing; the second housing includes a second outer ring, a wind guiding seat, and more than one second pressure piece; the second pressure pieces are distributed on the inner wall of the second outer ring and extend to connect the outer periphery of the wind guiding seat; the second outer ring, the second pressure pieces, and the wind guiding seat form a second speed-up air duct, and the second speed-up air duct increases through the second pressure pieces, resulting in a smaller radial ventilation area to pressurize and speed up the air flow so as to direct the air flow out; Wherein, the motor drives the fan blade to rotate to generate a negative pressure at the air inlet end to direct the air flow to the first speed-up air duct; the air flow is pressurized by the first pressure pieces on the first outer ring and guided to the second speed-up air duct; the air flow is pressurized and blown out by the second pressure pieces in the second speed-up air duct, so that the air flow increases in air volume and blowing distance after passing through the first speed-up air duct and the second speed-up air duct.

2. The staged pressurized mixed-flow hand-held fan according to claim 1, wherein: The first pressure pieces are distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure pieces of the first speed-up air duct gather the air flow reversely or guide the air flow forward to the second speed-up air duct, achieving the functions of gathering or pressurizing and guiding the air flow.

3. The staged pressurized mixed-flow hand-held fan according to claim 1, wherein: The motor includes a stator and a rotor, the stator is fixed on the motor mounting seat, the rotor is arranged on the fan blade, and the rotor is sleeved on the stator.

4. The staged pressurized mixed-flow hand-held fan according to claim 3, wherein: A convex column extending axially and having a hollow interior is provided on the motor mounting seat; The fan blade includes a hub portion and blades uniformly arranged on the outer peripheral surface of the hub portion, and the hub portion has a receiving portion recessed inward; The stator includes an iron core inserted on the convex column and a coil wound around the iron core; The rotor includes a rotating shaft axially arranged in the receiving portion and a magnetic ring attached to the radial inner wall of the receiving portion, and the rotating shaft is inserted into the convex column.

5. The staged pressurized mixed flow handheld fan according to claim 1, characterized in that: The air inlet cover comprises an air inlet cover, wherein the air inlet cover is provided with a hollow receiving portion from the air inlet end to the air outlet end, and at least a part of the receiving portion extends to the first shell or the second shell; To form a package that wraps the first shell or the first shell and the second shell, or to form a package that is contained in the first shell or the first shell and the second shell.

6. The staged pressurized mixed flow handheld fan according to any one of claims 1 to 5, characterized in that: The blades of the fan blade are distributed counterclockwise from the air inlet end to the air outlet end.

7. The staged pressurized mixed flow handheld fan according to claim 6, characterized in that: It includes a power supply interface for providing electric power, the power supply interface is electrically connected to the driving circuit board, and the power supply interface is exposed outside the handle.

8. The staged pressurized mixed flow handheld fan according to claim 1, characterized in that: The air guide seat is provided with a refrigeration component at the air outlet direction, and the refrigeration component includes a semiconductor refrigeration sheet and a cold guide cover. An installation space is formed on the side of the air guide seat close to the air outlet end, and the semiconductor refrigeration sheet is arranged in the installation space. The cold guide cover is covered on the installation space and in contact with the semiconductor refrigeration sheet.

9. The staged pressurized mixed flow handheld fan according to claim 1, characterized in that: It comprises a decorative ring, which is embedded in the circumferential edge of the air outlet end of the second shell, and the decorative ring is provided with a radially enlarged air guide arc surface from the air inlet end to the air outlet end.

10. The staged pressurized mixed flow handheld fan according to claim 1, characterized in that: The air guide seat is provided with a face cover at the air outlet direction, and the face cover and the air guide seat form an installation space. A digital display panel is provided in the installation space, and the digital display panel is used to display and / or control parameters.

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