High-speed pressurizing mixed-flow waist-hanging fan

Abstract

The utility model relates to the technical field of waist-hanging fans, and discloses a high-speed pressurizing mixed-flow waist-hanging fan which comprises a fan body provided with a hook assembly. The fan body comprises a first shell, a second shell, a third shell, a first motor and fan blades. The first shell is provided with a cavity, a motor mounting seat and a first pressurizing sheet are arranged in the cavity, the first motor is arranged on the motor mounting seat, and the fan blades are arranged at the output end of the first motor; the inner wall of the cavity, the first pressurizing sheet and the motor mounting seat form a first acceleration air duct; the second shell is arranged on one side of the motor mounting seat; the second shell comprises a second outer ring, a pressurizing seat and a second pressurizing sheet; the second outer ring, the second pressurizing sheet and the pressurizing seat form a second accelerating air duct; the third shell comprises a third outer ring, an air guide seat and a third pressurizing sheet; the third outer ring, the third pressurizing sheet and the air guide seat form a third speed-increasing air duct; after airflow is accelerated through the first acceleration air duct, the second acceleration air duct and the third acceleration air duct, the air volume and the air supply distance are increased.

Description

Technical Field

[0001] The utility model relates to the technical field of waist-mounted fans, in particular to a high-speed pressurized mixed-flow waist-mounted fan. Background Art

[0002] A waist-mounted fan is a fan that can be hung around the waist. For outdoor workers in hot weather, it can dissipate heat and provide cooling. However, current waist-mounted fans primarily use a single motor to rotate the fan blades, resulting in low air speed and inefficient cooling.

[0003] Therefore, improvements need to be made to this. Utility Model Content

[0004] The technical problem solved by the present invention is to provide a high-speed pressurized mixed-flow waist-mounted fan to solve the problems raised in the above-mentioned background technology in view of the defects existing in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: A high-speed supercharged mixed-flow waist-mounted fan, comprising: a fan body, wherein the fan body is provided with one or more hook assemblies on the outside, and the hook assemblies are used to hang the fan body on the waist; the fan body comprises a first shell, a second shell, a third shell, a first motor and fan blades; the first shell has one or more cavities, one end of the cavity is the air inlet end, and the other side of the cavity is the air outlet end, a motor mounting seat and one or more first pressure plates are provided in the cavity, the first motor is provided on the motor mounting seat, and the fan blades are provided on the output end of the first motor, the first pressure plates are distributed on the inner wall of the cavity and extend to connect the outer peripheral edge of the motor mounting seat; the inner wall of the cavity, the first pressure plate and the motor mounting seat form a first speed-increasing air duct, the first speed-increasing air duct is increased by the first pressure plate, resulting in a reduction in radial ventilation area, thereby pressurizing and accelerating the airflow; a second shell, the second shell is provided on one side of the motor mounting seat; the second shell comprises a second outer ring, a supercharge seat and one or more second pressure plates; the second pressure plates are distributed on the inner wall of the second outer ring and extend to connect The air intake duct is connected to the outer peripheral edge of the boost seat; the inner wall of the second outer ring, the second pressure plate and the boost seat form a second speed-increasing air duct, and the second speed-increasing air duct is increased by the second pressure plate, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the air flow; a third shell, the third shell is arranged at the air outlet end of the cavity; the third shell includes a third outer ring, an air guide seat and one or more third pressure plates; the third pressure plates are distributed on the inner wall of the third outer ring and extend to connect the peripheral edge of the air guide seat; the third outer ring, the third pressure plate and the air guide seat form a third speed-increasing air duct, the third The three speed-increasing air ducts are increased by the third pressure plate, resulting in a smaller radial ventilation area, which pressurizes and accelerates the airflow so that the airflow is guided and blown out; wherein, the first motor drives the fan blades to rotate to generate negative pressure at the air inlet end to guide the airflow to the first speed-increasing air duct; the airflow is pressurized and guided to the second speed-increasing air duct through the first pressure plate in the first shell; the airflow is pressurized and blown to the third speed-increasing air duct through the second pressure plate in the second speed-increasing air duct and is blown out; so that the air volume and air supply distance are increased after the airflow is accelerated through the first speed-increasing air duct, the second speed-increasing air duct and the third speed-increasing air duct.

[0006] Furthermore, the first shell has two cavities.

[0007] Furthermore, the first pressure plate is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure plate of the first speed-increasing air duct guides the airflow forward or gathers the airflow in the reverse direction to the second speed-increasing air duct, and the second pressure plate is distributed counterclockwise or clockwise from the air inlet end to the air outlet end, so that the second pressure plate gathers the airflow in the reverse direction or blows it out in the forward direction, thereby achieving the effect of pressurizing and gathering the airflow.

[0008] Furthermore, the first 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 extending axially and hollow inside; the fan blades include a hub portion and blades evenly arranged on the outer peripheral surface of the hub portion, and the hub portion has a receiving portion 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 in 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 a driving circuit board, which is electrically connected to the first motor to drive the first motor to drive the fan blades to rotate, and the airflow is accelerated in sequence through the first speed-increasing air duct, the second speed-increasing air duct and the third speed-increasing air duct and then blown out.

[0011] Furthermore, a digital display panel is provided on one side of the third shell located at the air outlet end, and the digital display panel is used to control, adjust and / or display operating parameters.

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

[0013] Furthermore, the first shell is provided with an air inlet grille at the air inlet end, and the air inlet grille includes connecting strips evenly distributed around the circumference, and the connecting strips radially extend and connect to the inner wall of the first shell to form a gap to prevent foreign matter from entering.

[0014] Furthermore, the first shell is provided with a cabin, a battery is installed in the cabin, the battery is electrically connected to the driving circuit board, and the battery is used to provide power.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The waist-mounted fan adopts a three-speed-increasing duct structure. When the airflow passes through the first speed-increasing duct, the first pressure plate set in the first speed-increasing duct causes the radial ventilation area to decrease, thereby pressurizing the airflow. At the same time, the first speed-increasing duct is located at the air inlet end, thereby attracting surrounding air and increasing the air volume. When the airflow passes through the second speed-increasing duct, the second pressure plate of the second speed-increasing duct further pressurizes the airflow in the second stage. When the airflow passes through the third speed-increasing duct, the third pressure plate of the third speed-increasing duct further pressurizes the airflow in the third stage, thereby increasing the air volume and air delivery distance. With the accelerated wind speed, increased air volume and remote air delivery distance of the blown air, rapid cooling can be achieved in hot environments.

[0017] The first pressure plate in the first speed-increasing air duct is set to be distributed clockwise or counterclockwise, and the second pressure plate in the second speed-increasing air duct is set to be distributed counterclockwise or clockwise. With the combined effect of the two, it is possible to first guide the airflow and then gather the air, thereby adjusting the direction of the airflow; or to first gather the airflow and then guide the air, thereby adjusting the direction of the airflow.

[0018] The dual-cavity dual-air outlet method produces faster air volume and speed, cooling the user. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure from another angle.

[0021] Figure 3 yes Figure 1 Schematic diagram of the structure from another angle.

[0022] Figure 4 It is a structural diagram of the double cavity of the utility model.

[0023] Figure 5 It is a structural diagram of the double cavity of the utility model.

[0024] Figure 6 It is a schematic cross-sectional view of the double-cavity structure of the utility model.

[0025] Figure 7 It is a schematic diagram of the airflow structure of the double cavity of the utility model.

[0026] Figure 8 A schematic structural diagram of a single cavity of the utility model.

[0027] Figure 9 It is a schematic diagram of the airflow structure of a single cavity of the utility model.

[0028] Figure 10 Schematic diagram of the explosion structure of the utility model.

[0029] Figure 11 Schematic diagram of the explosion structure of the utility model.

[0030] Figure 12 It is a structural schematic diagram of the first shell.

[0031] Figure 13 It is a structural schematic diagram of the second shell.

[0032] Figure 14 It is a structural diagram of the third shell.

[0033] Figure 15 It is a structural diagram of the first motor and fan blades.

[0034] Figure numerals: 1. Fan body; 2. Hook assembly; 3. First shell; 4. Second shell; 5. Third shell; 6. First motor; 7. Fan blades; 8. Cavity; 9. Motor mounting seat; 10. First pressure plate; 11. First speed-increasing air duct; 12. Second outer ring; 13. Pressure seat; 14. Second pressure plate; 15. Second speed-increasing air duct; 16. Third outer ring; 17. Air guide seat; 18. Third pressure plate; 19. Third speed-increasing air duct; 20. Stator; 21. Rotor; 22. Boss; 23. Hub; 24. Blades; 25. Storage portion; 26. Rotating shaft; 27. Magnetic ring; 28. Drive circuit board; 29. ​​Digital display panel; 30. Power supply interface; 31. Air inlet grille; 32. Cabin; 33. Battery. DETAILED DESCRIPTION

[0035] The present invention 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 be used 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", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "several" or "multiple" means two or more, unless otherwise specifically defined. In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. A person skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them. Furthermore, "above," "above," and "above" a first feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a lower level than the second feature.

[0037] In view of the technical problems recorded in the background technology, such as Figure 1-14As shown, a high-speed pressurized mixed-flow waist-hanging fan is provided, comprising: a fan body 1, wherein the outside of the fan body 1 is provided with one or more hook assemblies 2, and the hook assembly 2 is used to hang the fan body 1 on the waist; the fan body 1 comprises a first shell 3, a second shell 4, a third shell 5, a first motor 6 and a fan blade 7; the first shell 3 has one or more cavities 8, one end of the cavity 8 is the air inlet end, and the other side of the cavity 8 is the air outlet end, a motor mounting seat 9 and one or more first pressure sheets 10 are provided in the cavity 8, the first motor 6 is arranged on the motor mounting seat 9, and the fan blade 7 is arranged at the output end of the first motor 6 On the upper part, the first pressurizing sheet 10 is distributed on the inner wall of the cavity 8 and extends to connect the outer peripheral edge of the motor mounting seat 9; the inner wall of the cavity 8, the first pressurizing sheet 10 and the motor mounting seat 9 form a first speed-increasing air duct 11, and the first speed-increasing air duct 11 is increased by the first pressurizing sheet 10, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow; the second shell 4, the second shell 4 is arranged on one side of the motor mounting seat 9; the second shell 4 includes a second outer ring 12, a pressurizing seat 13 and one or more second pressurizing sheets 14; the second pressurizing sheets 14 are distributed on the inner wall of the second outer ring 12 and extend to connect to the peripheral edge of the pressurizing seat 13; The inner wall of the second outer ring 12, the second pressure plate 14 and the pressurizing seat 13 form a second speed-increasing air duct 15, and the second speed-increasing air duct 15 is increased by the second pressure plate 14, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow; a third shell 5, the third shell 5 is arranged at the air outlet end of the cavity 8; the third shell 5 includes a third outer ring 16, an air guide seat 17 and one or more third pressure plates 18; the third pressure plates 18 are distributed on the inner wall of the third outer ring 16 and extend to the outer peripheral edge of the air guide seat 17; the third outer ring 16, the third pressure plate 18 and the air guide seat 17 form a third speed-increasing air duct 19, the third The speed-increasing air duct 19 is increased by the third pressure plate 18, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow so as to guide the airflow to be blown out; wherein, the first motor 6 drives the fan blades 7 to rotate to generate negative pressure at the air inlet end to guide the airflow to the first speed-increasing air duct 11; the airflow is pressurized and guided to the second speed-increasing air duct 15 through the first pressure plate 10 in the first shell; the airflow is pressurized and blown to the third speed-increasing air duct 19 through the second pressure plate 14 in the second speed-increasing air duct 15 and blown out; so that the airflow increases the air volume and air supply distance after passing through the first speed-increasing air duct 11, the second speed-increasing air duct 15, and the third speed-increasing air duct 19.

[0038] In the above technical solution, the hook assembly 2 includes a first hook arranged on one side of the outside of the fan body 1, and a second hook arranged on the other side of the outside of the fan body 1, wherein the first hook can be hung on the user's waist, and the second hook can hang the user's clothes to prevent the clothes from blocking the fan body, causing the blowing effect of the fan body to deteriorate.

[0039] like Figure 12 , a cavity 8 is set in the first shell 3. The cavity 8 is a straight hollow channel. The cavity 8 is used to install the first motor 6 and the fan blades 7 and other components. Specifically, a motor mounting seat 9 and a first pressure plate 10 are set in the cavity 8. The motor mounting seat 9 and the inner wall of the cavity 8 can be integrally formed or independent components. The motor mounting seat 9 can be set at the air inlet end or the air outlet end of the inner wall of the cavity 8. As an implementable technical method, the motor mounting seat 9 and the inner wall of the cavity 8 are integrally formed and the motor mounting seat 9 is set at the air outlet end of the inner wall of the cavity 8. The first pressure plate 10 can be evenly distributed or unevenly distributed between the inner wall of the cavity 8 and the motor mounting seat 9. Preferably, the first pressure plate 10 adopts a circumferentially uniform distribution form. Due to the presence of the first pressure plate 10, the radial ventilation area of ​​the airflow in the channel through the cavity 8 becomes smaller, and the first shell 3 is located at the air inlet end. The airflow can absorb the airflow around it and increase the air volume; at the same time, the airflow is pressurized to increase the speed of the blown airflow.

[0040] like Figure 13 The second housing 4 is assembled within the cavity 8 and includes a second outer ring 12, a pressurizing seat 13, and a second pressurizing plate 14. These two components can be integrally formed or separate components. Preferably, they are integrally formed. The second housing 4 can be integrally formed with the first housing 3 or separate components. The second pressurizing plate 14 can be evenly or unevenly distributed between the second outer ring 12 and the pressurizing seat 13. Preferably, the second pressurizing plate 14 is evenly distributed around the circumference. The presence of the second pressurizing plate 14 in the second speed-increasing air duct 15 reduces the radial ventilation area of ​​the airflow passing through the second outer ring 1212, further pressurizing the airflow and increasing its velocity.

[0041] like Figure 14, the third shell 5 is arranged at the air outlet end of the second shell 4; the third shell 5 includes a third outer ring 16, an air guide seat 17 and one or more third pressure plates 18; the third pressure plates 18 are distributed on the inner wall of the third outer ring 16 and extend to the outer peripheral edge of the air guide seat 17; the third outer ring 16, the third pressure plates 18 and the air guide seat 17 form a third speed-increasing air duct 19, and the third speed-increasing air duct 19 is increased by the third pressure plate 18, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow so as to guide the airflow to be blown out.

[0042] The waist-mounted fan adopts a three-speed-increasing duct structure. When the airflow passes through the first speed-increasing duct 11, the first pressure plate 10 provided in the first speed-increasing duct 11 causes the radial ventilation area to decrease, thereby pressurizing the airflow. At the same time, the first speed-increasing duct 11 is located at the air inlet end, thereby attracting surrounding air and increasing the air volume. When the airflow passes through the second speed-increasing duct 15, the second pressure plate 14 of the second speed-increasing duct 15 further pressurizes the airflow in the second stage. When the airflow passes through the third speed-increasing duct 19, the third pressure plate 18 of the third speed-increasing duct 19 further pressurizes the airflow in the third stage, thereby increasing the air volume and air delivery distance. With the accelerated wind speed, increased air volume and remote air delivery distance of the blown airflow, rapid cooling can be achieved in hot environments.

[0043] In another feasible technical solution, referring to Figure 4-7 As shown, the first housing 3 has two cavities 8. Of course, the first housing 3 can have more cavities 8, the number of which can be selected based on the specific implementation. Each cavity 8 also adopts the same structure, with the motor mounting base 9, the first motor 6, the fan blades 7, and the second housing 4 arranged within the cavity 8. The use of multiple cavities 8 can increase the airflow volume, achieve rapid cooling for the user, and increase the airflow range to cool different parts of the body.

[0044] refer to Figure 12 and Figure 13 As shown, the first pressure plate 10 is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure plate 10 of the first speed increasing air duct 11 guides the airflow in the forward direction or gathers the airflow in the reverse direction to the second speed increasing air duct 15, and the second pressure plate 14 is distributed counterclockwise or clockwise from the air inlet end to the air outlet end, so that the second pressure plate 14 gathers the airflow in the reverse direction or blows it out in the forward direction, thereby achieving the effect of pressurizing and gathering the airflow.

[0045] In one practicable embodiment, the first pressure plate 10 is arranged in a clockwise direction and the second pressure plate 14 is arranged in a counterclockwise direction. As the airflow is driven by the fan blades 7, the airflow moves centrifugally along the surrounding directions of the fan blades 7. The setting direction of the first pressure plate 10 of the first speed-increasing air duct 11 is opposite to the direction of the airflow. The first pressure plate 10 gathers the wind moving in the surrounding directions and changes the flow direction of the airflow. The airflow passing through the first speed-increasing air duct 11 is guided to the second speed-increasing air duct 15. The second pressure plate 14 of the second speed-increasing air duct 15 is arranged in a counterclockwise direction. Since the counterclockwise setting of the second pressure plate 14 is the same as the direction of the airflow, the second pressure plate 14 guides the gathered airflow and blows the air through the second speed-increasing air duct 15 out in a forward direction. This avoids the airflow from being dispersed and blown out, resulting in air volume loss, and achieves the effect of wind gathering and pressure increase.

[0046] In another feasible method, the first pressure plate 10 is set counterclockwise and the second pressure plate 14 is set clockwise. As the airflow passes through the fan blades 7, the airflow moves centrifugally along the four directions of the fan blades 7. The setting direction of the first pressure plate 10 of the first speed increasing duct 11 is the same as the direction of the airflow movement. The first pressure plate 10 will guide and pressurize the wind moving in all directions. Since the clockwise setting of the second pressure plate 14 is opposite to the direction of the airflow movement, the second pressure plate 14 can gather the airflow and change the flow direction of the airflow, so that the airflow can be blown out from the front when it is blown out, avoiding the airflow from being dispersed and causing air volume loss.

[0047] refer to Figure 10 、 11 As shown in FIG15 , the first motor 6 includes a stator 20 and a rotor 21. The stator 20 is fixed to the motor mounting base 9. The rotor 21 is disposed on the fan blade 7. The rotor 21 is sleeved on the stator 20. In practice, the first motor 6 can be a brushed motor or a brushless motor.

[0048] The motor mounting seat 9 is provided with a boss 22 extending axially and hollow inside; the fan blade 7 includes a hub portion 23 and blades 24 evenly arranged on the outer peripheral surface of the hub portion 23, and the hub portion 23 has a receiving portion 25 recessed inwardly; the stator 20 includes an iron core inserted on the boss 22 and a coil wound on the iron core; the rotor 21 includes a rotating shaft 26 axially arranged on the receiving portion 25 and a magnetic ring 27 attached to the radial inner wall of the receiving portion 25, and the rotating shaft 26 is inserted in the boss 22.

[0049] Preferably, as an implementable technical solution, the first motor 6 adopts an outer rotor 21 brushless motor. Structurally, the hub 23 of the fan blade 7 is provided with a storage portion 25, and the fan blade 7 is used as the installation position of the rotor 21. The magnetic ring 27 and the rotating shaft 26 of the rotor 21 are arranged at the position of the storage portion 25, thereby optimizing the structure and saving the number of components. At the same time, a hollow boss 22 is provided on the motor mounting seat 9 to facilitate the insertion of the rotating shaft 26 into the boss 22 for positioning. At the same time, the iron core and coil of the stator 20 can be sleeved on the boss 22 for positioning. The fan blade 7 is driven by the designed outer rotor 21 brushless motor structure, which can be more compact in structure, save the number of components, and thus reduce costs.

[0050] like Figure 10-11 As shown, it includes a driving circuit board 28, which is electrically connected to the first motor 6 to drive the first motor 6 to drive the fan blades 7 to rotate, and the air flow is accelerated in sequence through the first speed-increasing air duct 11, the second speed-increasing air duct 15 and the third speed-increasing air duct 19 and then blown out.

[0051] The driving circuit board 28 can be provided with a control circuit or installed with a control chip to realize the control of the fan body 1, for example, the adjustment of the speed of the first motor 6, the start or stop of the device can be selected according to the implementation situation.

[0052] A digital display panel 29 is provided on one side of the third housing 5 at the air outlet end. The digital display panel 29 is used to control, adjust, and / or display operating parameters. The digital display panel 29 primarily displays the fan's operating status or other data, such as the fan speed level, battery 33 charge, wind speed, operating time, and other parameters.

[0053] The present invention includes a power supply interface 30 for providing power, and the power supply interface 30 is electrically connected to the driving circuit board 28. The power supply interface 30 can be connected to the mains power supply through a power line, or the power supply interface 30 can be connected to the mains power supply to power the battery 33 through a power line.

[0054] Furthermore, the first shell 3 is provided with an air inlet grille 31 at the air inlet end. The air inlet grille 31 includes connecting strips evenly distributed around the circumference. The connecting strips extend radially to connect to the inner wall of the first shell to form a gap to prevent foreign matter from entering.

[0055] Reference Figure 11 and Figure 12As shown, the first housing 3 is provided with a compartment 32, in which a battery 33 is mounted. The battery 33 is electrically connected to the driver circuit board 28 and is used to provide power. A compartment 32 for accommodating the battery 33 can be provided within the fan body 1, and the battery 33 is used for power supply. The battery 33 can be a rechargeable battery 33, which is charged via the power supply interface 30.

[0056] 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 high-speed boost mixed flow waist-mounted fan, characterized in that: include: A fan body, wherein the fan body is provided with one or more hook assemblies on the outside, and the hook assemblies are used to hang the fan body at the waist; The fan body includes a first shell, a second shell, a third shell, a first motor and fan blades; The first shell has one or more cavities, one end of the cavity is an air inlet end, and the other side of the cavity is an air outlet end. A motor mounting seat and one or more first pressure plates are provided in the cavity. The first motor is provided on the motor mounting seat, and the fan blades are provided on the output end of the first motor. The first pressure plates are distributed on the inner wall of the cavity and extend to connect the outer peripheral edge of the motor mounting seat; the inner wall of the cavity, the first pressure plate and the motor mounting seat form a first speed-increasing air duct, and the first speed-increasing air duct is increased by the first pressure plate, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow; A second shell, the second shell is arranged on one side of the motor mounting seat; the second shell includes a second outer ring, a boost seat and one or more second pressure plates; the second pressure plates are distributed on the inner wall of the second outer ring and extend to the outer peripheral edge of the boost seat; the inner wall of the second outer ring, the second pressure plates and the boost seat form a second speed-increasing air duct, and the second speed-increasing air duct is increased by the second pressure plates, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow; A third shell, the third shell is arranged at the air outlet end of the cavity; the third shell includes a third outer ring, an air guide seat and one or more third pressure plates; the third pressure plates are distributed on the inner wall of the third outer ring and extend to connect the outer peripheral edge of the air guide seat; the third outer ring, the third pressure plates and the air guide seat form a third speed-increasing air duct, and the third speed-increasing air duct is increased by the third pressure plate, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow so as to guide the airflow to be blown out; Among them, the first motor drives the fan blades to rotate to generate negative pressure at the air inlet end to guide the airflow to the first speed-increasing air duct; the airflow is pressurized by the first pressure plate in the first shell and guided to the second speed-increasing air duct; the airflow is pressurized by the second pressure plate in the second speed-increasing air duct and blown out to the third speed-increasing air duct; so that the airflow increases the air volume and air supply distance after passing through the first speed-increasing air duct, the second speed-increasing air duct and the third speed-increasing air duct.

2. The high-speed boost mixed-flow waist-mounted fan according to claim 1, characterized in that: The first shell has two cavities.

3. The high-speed boost mixed-flow waist-mounted fan according to claim 1, characterized in that: The first pressure plate is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure plate of the first speed-increasing air duct guides the airflow forward or gathers the airflow in the reverse direction to the second speed-increasing air duct, and the second pressure plate is distributed counterclockwise or clockwise from the air inlet end to the air outlet end, so that the second pressure plate gathers the airflow in the reverse direction or blows it out in the forward direction, thereby achieving the effect of pressurizing and gathering the airflow.

4. The high-speed boost mixed-flow waist-mounted fan according to claim 1, characterized in that: The first motor includes a stator and a rotor. The stator is fixed on the motor mounting seat. The rotor is arranged on the fan blades and is sleeved on the stator.

5. The high-speed boost mixed-flow waist-mounted fan according to claim 4, characterized in that: The motor mounting seat is provided with a convex column extending in the axial direction and having a hollow interior; The fan blade includes a hub portion and blades evenly arranged on the outer circumference of the hub portion, and the hub portion has a receiving portion that is recessed inwardly; The stator includes an iron core inserted on the protruding 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 into the protruding column.

6. The high-speed boost mixed-flow waist-mounted fan according to any one of claims 1, 3 or 5, characterized in that: It includes a driving circuit board, which is electrically connected to the first motor to drive the first motor to drive the fan blades to rotate, and the airflow is accelerated in sequence through the first speed-increasing air duct, the second speed-increasing air duct and the third speed-increasing air duct and then blown out.

7. The high-speed boost mixed-flow waist-mounted fan according to claim 6, characterized in that: A digital display panel is provided on one side of the third shell located at the air outlet end, and the digital display panel is used to control, adjust and / or display operating parameters.

8. The high-speed boost mixed-flow waist-mounted fan according to claim 7, characterized in that: A power supply interface is included for providing power, and the power supply interface is electrically connected to the driving circuit board.

9. The high-speed boost mixed-flow waist-mounted fan according to claim 8, characterized in that: The first shell is provided with an air inlet grille at the air inlet end. The air inlet grille includes connecting strips evenly distributed around the circumference. The connecting strips extend radially to connect to the inner wall of the first shell to form a gap to prevent foreign matter from entering.

10. The high-speed boost mixed-flow waist-mounted fan according to claim 9, characterized in that: The first shell is provided with a cabin, a battery is installed in the cabin, the battery is electrically connected to the driving circuit board, and the battery is used to provide power.

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