Airflow speed-increasing mixed flow generator

Abstract

The utility model relates to the technical field of fans, and discloses an airflow speed-increasing mixed flow generator which comprises a motor installation base. A motor; a fan blade; the first shell comprises a first outer ring and a first pressurizing sheet, and the inner wall of the first outer ring, the first pressurizing sheet and the motor mounting seat form a first acceleration air duct; the second shell comprises a second outer ring, a pressurizing seat and a second pressurizing sheet; the inner wall of the second outer ring, the second pressurizing sheet and the pressurizing seat form a second speed-increasing air duct; the motor drives the fan blades to rotate to generate negative pressure at the air inlet end to guide airflow to the first speed-increasing air duct and the second speed-increasing air duct. After airflow is accelerated through the first acceleration air duct and the second 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 fans, in particular to an airflow speed increasing mixed flow generator. Background Art

[0002] A fan is an electrical appliance commonly used in people's daily lives. Its principle is to use a motor to drive the fan blades to rotate to make the air flow, thereby achieving the purpose of cooling.

[0003] Currently, most of the popular fans on the market are axial flow fans. The working principle of axial flow fans is to draw air in from one end and blow it out from the other end in a direction parallel to the axis without changing the direction of the airflow. It is straight in and straight out, and has the advantages of small wind resistance and less air volume loss.

[0004] However, in actual use, due to the low wind pressure of its axial flow fan, the air supply distance is short. The air flow cannot be felt at a slightly farther distance, and the user cannot be cooled.

[0005] Therefore, improvements need to be made. Utility Model Content

[0006] The technical problem solved by the utility model is to provide an airflow speed increasing mixed flow generator for solving the problems raised in the above-mentioned background technology in view of the defects existing in the above-mentioned prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: an airflow speed-increasing mixed flow generator, comprising a motor mounting seat; a motor, the motor being arranged on the motor mounting seat; a fan blade, the fan blade being arranged on the output end of the motor; a first shell, the first shell being located at the air inlet end; the first shell comprising a first outer ring and one or more first pressure sheets; the first pressure sheets 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 radial cross-sectional thickness of the first pressure sheet close to the air inlet end is less than the radial cross-sectional thickness of the first pressure sheet close to the air outlet end; the inner wall of the first outer ring, the first pressure sheet and the motor mounting seat form a first speed-increasing air duct, the radial ventilation area of ​​the first speed-increasing air duct is reduced due to the increase of the first pressure sheet, so as to pressurize and speed up the airflow; a second shell, the second shell being located at the air outlet end and connected to the first shell; the second shell comprising a second outer ring, a pressurizing seat and one or more first pressure sheets Two pressure plates; the second pressure plate is distributed on the inner wall of the second outer ring and extends to the outer peripheral edge of the boost seat, the radial cross-sectional thickness of the second pressure plate near the air inlet end is smaller than the radial cross-sectional thickness of the second pressure plate near the air outlet end; 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 airflow; wherein, the motor drives the fan blades to rotate, generates negative pressure at the air inlet end, and guides the airflow to the first speed-increasing air duct; the airflow is pressurized by the first pressure plate on the first outer ring and guided to the second speed-increasing air duct; the airflow is pressurized and blown out by the second pressure plate in the second 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 and the second speed-increasing air duct; the airflow passes through the first pressure plate and the second pressure plate from the air inlet end to the air outlet end in turn to cut the airflow to reduce turbulent noise.

[0008] Furthermore, the first pressure sheet is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure sheet of the first speed-increasing air duct guides the airflow in a forward direction or gathers the airflow in a reverse direction to the second speed-increasing air duct; the second pressure sheet is distributed counterclockwise or clockwise from the air inlet end to the air outlet end, so that the second pressure sheet gathers the airflow in a reverse direction or blows it out in a forward direction, thereby achieving the effect of pressurizing and gathering the airflow.

[0009] Furthermore, the 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 the rotor is sleeved on the stator.

[0010] 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.

[0011] Furthermore, it includes a driving circuit board; the driving circuit board is electrically connected to the motor to drive the motor to drive the fan blades to rotate, and the airflow is accelerated through the first speed-increasing air duct and the second speed-increasing air duct in sequence and then blown out.

[0012] Further, it includes an outer shell; the outer shell 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.

[0013] Furthermore, the blades of the fan blades are distributed counterclockwise from the air inlet end to the air outlet end.

[0014] Furthermore, it includes a power supply interface for providing electric power; the power supply interface is electrically connected to the driving circuit board.

[0015] Furthermore, the 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, and the connecting strips radially extend and connect to the inner wall of the shell to form a gap to prevent foreign matter from entering.

[0016] Furthermore, it includes a battery; the battery is electrically connected to the power supply interface so that the battery can be charged and store electricity.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. A double-speed increasing air duct form is adopted. 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 to pressurize the airflow. The first pressure plate is structurally designed to be thin at the front and thick at the back. When the airflow passes through the first pressure plate, it can cut the airflow, reduce turbulent noise, and pressurize the airflow at the same time. The first speed increasing air duct is located at the air inlet end, so that it can absorb the 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 to pressurize the airflow. The second pressure plate is structurally designed to be thin at the front and thick at the back. When the airflow passes through the second pressure plate, it can cut the airflow, reduce turbulent noise, and pressurize the airflow at the same time. Two-stage air flow pressurization is achieved, thereby increasing the air volume and air supply distance of the airflow.

[0019] 2. The first pressure plate in the first speed-increasing air duct is arranged to be distributed clockwise or counterclockwise, and the second pressure plate in the second speed-increasing air duct is arranged to be distributed counterclockwise or clockwise. With the combined effect of the two, it is possible to guide the airflow first and then gather the air, thereby adjusting the direction of the airflow; or to gather the airflow first and then guide the air, thereby adjusting the direction of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model.

[0021] Figure 2 It is a structural schematic diagram of the utility model from another angle.

[0022] Figure 3 It is a schematic diagram of the explosion structure of the utility model.

[0023] Figure 4 2 is a schematic diagram of the first shell structure.

[0024] Figure 5 2 is a schematic diagram of the second shell structure.

[0025] Figure 6 It is a cross-sectional structural schematic diagram of the utility model.

[0026] Figure 7 It is a schematic diagram of the structure of the first shell and the second shell.

[0027] Figure 8 It is a schematic diagram of the structure of the fan blade.

[0028] Fig. 9 It is a structural diagram of the fan blades and rotor.

[0029] Fig.10 It is a schematic diagram of the structure of the stator.

[0030] Fig.11 It is a schematic diagram of the structure of the shell.

[0031] Figure numerals: 1. motor mounting seat; 2. motor; 3. fan blades; 4. first shell; 5. first outer ring; 6. first pressure plate; 7. first speed-increasing air duct; 8. second shell; 9. second outer ring; 10. pressure seat; 11. second pressure plate; 12. second speed-increasing air duct; 13. stator; 14. rotor; 15. boss; 16. hub; 17. blades; 18. storage portion; 19. core; 20. coil; 21. rotating shaft; 22. magnetic ring; 23. driving circuit board; 24. shell; 25. accommodating portion; 26. power supply interface; 27. air inlet grille; 28. battery. DETAILED DESCRIPTION

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0033] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and cannot be understood 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" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is 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 therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meanings of "several" and "multiple" are two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature can include the first and second features being in direct contact, or it can include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] like Figure 1-6As shown, an airflow speed-increasing mixed flow generator is provided, comprising: a motor mounting seat 1; a motor 2, wherein the motor 2 is arranged on the motor mounting seat 1; a fan blade 3, wherein the fan blade 3 is arranged on the output end of the motor 2; a first shell 4, wherein the first shell 4 is located at the air inlet end; the first shell 4 comprises a first outer ring 5 and one or more first pressure sheets 6; the first pressure sheets 6 are distributed on the inner wall of the first outer ring 5 and extend to connect the outer peripheral edge of the motor mounting seat 1, and the radial cross-sectional thickness of the first pressure sheet 6 near the air inlet end is less than the radial cross-sectional thickness of the first pressure sheet 6 near the air outlet end; the inner wall of the first outer ring 5, the first pressure sheet 6 and the motor mounting seat 1 form a first speed-increasing air duct 7, and the first speed-increasing air duct 7 is increased by the first pressure sheet 6, resulting in a smaller radial ventilation area, thereby pressurizing and speeding up the airflow; a second shell 8, wherein the second shell 8 is located at the air outlet end and connected to the first shell 4; the second shell 8 comprises a second outer ring 9, a pressurizing seat 10 and one or more second pressure sheets 11; the second pressure sheet 11 is distributed on the inner wall of the second outer ring 9 and extends to the outer peripheral edge of the boost seat 10, and the radial cross-sectional thickness of the second pressurizing sheet 11 near the air inlet end is smaller than the radial cross-sectional thickness of the second pressurizing sheet 11 near the air outlet end; the inner wall of the second outer ring 9, the second pressurizing sheet 11 and the boost seat 10 form a second speed-increasing air duct 12, and the second speed-increasing air duct 12 is increased by the second pressurizing sheet 11, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow; wherein, the motor 2 drives the fan blades 3 to rotate, generating a negative pressure at the air inlet end to guide the airflow to the first speed-increasing air duct 7; the airflow is pressurized and guided to the second speed-increasing air duct 12 through the first pressurizing sheet 6 on the first outer ring 5; the airflow is pressurized and blown out through the second pressurizing sheet 11 in the second speed-increasing air duct 12; so that the airflow increases the air volume and air supply distance after passing through the first speed-increasing air duct 7 and the second speed-increasing air duct 12; the airflow passes through the first pressurizing sheet 6 and the second pressurizing sheet 11 from the air inlet end to the air outlet end in turn to cut the airflow to reduce turbulent noise.

[0035] In view of the technical problems recorded in the background technology, an airflow speed increasing mixed flow generator is proposed. In the above technical scheme, the motor mounting seat 1 is arranged on the first shell 4. The motor mounting seat 1 and the first shell 4 can be integrally formed or independent components. The motor mounting seat 1 can be arranged at the air inlet end position or the air outlet end position of the first shell 4. As an implementable technical method, the motor mounting seat 1 and the first shell 4 are integrally formed and the motor mounting seat 1 is arranged at the air outlet end of the first shell 4. The first pressure plate 6 can be evenly distributed or unevenly distributed between the first outer ring 5 and the motor mounting seat 1. Preferably, the first pressure plate 6 adopts a uniform circumferential distribution form. Due to the presence of the first pressure plate 6, the radial ventilation area of ​​the airflow passing through the first outer ring 5 becomes smaller, 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; refer to Figure 4 , the thickness of the radial section of the structure of the first pressure sheet 6 near the air inlet end is less than the thickness of the radial section of the structure of the first pressure sheet 6 near the air outlet end, that is, the structure is thin at the front and thick at the back in the direction from the air inlet end to the air outlet end. When the airflow passes through the first pressure sheet 6, the first pressure sheet 6 at the air inlet end can cut the airflow, reduce turbulence, and reduce noise. The thickening of the first pressure sheet 6 at the air outlet end can pressurize and speed up the airflow; the second shell 8 includes a second outer ring 9, a booster seat 10 and a second pressure sheet 11, wherein the second outer ring 9 and the booster seat 10 and the second pressurizing sheet 11 can be integrally formed or in the form of independent components. Preferably, the second outer ring 9, the pressurizing seat 10 and the second pressurizing sheet 11 are integrally formed, the second shell 8 can be integrally formed with the first shell 4 or in the form of independent components, and the second pressurizing sheet 11 can be evenly distributed or unevenly distributed between the second outer ring 9 and the pressurizing seat 10. Preferably, the second pressurizing sheet 11 is in the form of uniform circumferential distribution. Due to the presence of the second pressurizing sheet 11, the radial ventilation area of ​​the airflow passing through the second outer ring 9 becomes smaller; refer to Figure 5 The radial cross-sectional thickness of the second pressure sheet 11 near the air inlet end is smaller than the radial cross-sectional thickness of the second pressure sheet 11 near the air outlet end, that is, the structure is thin at the front and thick at the back in the direction from the air inlet end to the air outlet end. When the airflow passes through the second pressure sheet 11, the second pressure sheet 11 at the air inlet end can cut the airflow, reduce the turbulence, and reduce noise. The thickening of the second pressure sheet 11 at the air outlet end can pressurize and increase the speed of the airflow. Through this technical solution, the secondary airflow can be pressurized, the airflow speed can be increased, and at the same time, the turbulence can be reduced and the noise can be reduced.

[0036] The above technical solution adopts a double speed-increasing air duct form. When the airflow passes through the first speed-increasing air duct 7, the first pressure plate 6 arranged in the first speed-increasing air duct 7 causes the radial ventilation area to become smaller to achieve the pressurization of the airflow. The first pressure plate 6 is structurally designed to be thin at the front and thick at the back. When the airflow passes through the first pressure plate 6, it can cut the airflow, reduce turbulent noise, and at the same time pressurize the airflow; the first speed-increasing air duct 7 is located at the air inlet end, so that it can absorb the surrounding air and increase the air volume; when the airflow passes through the second speed-increasing air duct 12, the second pressure plate 11 arranged in the second speed-increasing air duct 12 causes the radial ventilation area to become smaller to achieve the pressurization of the airflow. The second pressure plate 11 is structurally designed to be thin at the front and thick at the back. When the airflow passes through the second pressure plate 11, it can cut the airflow, reduce turbulent noise, and at the same time pressurize the airflow; two-stage pressurization of the airflow is achieved, and then the air volume and air supply distance of the airflow are increased.

[0037] refer to Figure 4 , Figure 5 and Figure 7 As shown, the first pressure plate 6 is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure plate 6 of the first speed increasing air duct 7 guides the airflow in the forward direction or gathers the airflow in the reverse direction to the second speed increasing air duct 12, and the second pressure plate 11 is distributed counterclockwise or clockwise from the air inlet end to the air outlet end, so that the second pressure plate 11 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.

[0038] As a preferred technical solution, in an implementable manner, the first pressure plate 6 is arranged in a clockwise direction and the second pressure plate 11 is arranged in a counterclockwise direction. As the airflow is driven by the fan blades 3, the airflow moves centrifugally in the directions around the fan blades 3. The setting direction of the first pressure plate 6 of the first speed increasing duct 7 is opposite to the direction of the airflow movement. The first pressure plate 6 gathers the wind moving around and changes the flow direction of the airflow; the airflow passing through the first speed increasing duct 7 is guided to the second speed increasing duct 12. The second pressure plate 11 of the second speed increasing duct 12 is arranged in a counterclockwise direction. Since the counterclockwise setting of the second pressure plate 11 is the same as the movement direction of the airflow, the second pressure plate 11 guides the gathered airflow and can trim the direction of the airflow passing through the first pressure plate 6. Then, the wind passing through the second speed increasing duct 12 is blown out from the front and will not disperse around, thereby achieving a straight-out effect and the effect of gathering and pressurizing the air.

[0039] In another feasible manner, the first pressure plate 6 is arranged counterclockwise and the second pressure plate 11 is arranged clockwise. As the airflow is driven by the fan blades 3, the airflow moves centrifugally in the directions around the fan blades 3. The setting direction of the first pressure plate 6 of the first speed increasing air duct 7 is the same as the direction of the airflow movement. The first pressure plate 6 guides and pressurizes the wind moving in all directions. Since the clockwise setting of the second pressure plate 11 is opposite to the direction of the airflow movement, the second pressure plate 11 can gather the wind moving in all directions and change the flow direction of the airflow, and then blow the airflow out in a frontal direction without dispersing in all directions, thereby achieving a straight-out effect.

[0040] Preferably, the motor 2 includes a stator 13 and a rotor 14, wherein the stator 13 is fixed on the motor mounting base 1, and the rotor 14 is disposed on the fan blades 3, and the rotor 14 is sleeved on the stator 13. In implementation, the motor 2 can be a brushed motor or a brushless motor, and can drive the fan blades 3 to rotate.

[0041] Reference Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.10 As shown, the motor 2 mounting base 1 is provided with a convex column 15 which extends axially and is hollow inside; the fan blade 3 includes a hub portion 16 and blades 17 evenly arranged on the outer peripheral surface of the hub portion 16, and the hub portion 16 has a receiving portion 18 which is recessed inwardly; the stator 13 includes an iron core 19 inserted on the convex column 15 and a coil 20 wound on the iron core 19; the rotor 14 includes a rotating shaft 21 axially arranged on the receiving portion 18 and a magnetic ring 22 attached to the radial inner wall of the receiving portion 18, and the rotating shaft 21 is inserted in the convex column 15.

[0042] Preferably, as an implementable technical solution, the motor 2 adopts an outer rotor brushless motor. Structurally, the hub portion 16 of the fan blade 3 is provided with a storage portion 18, and the fan blade 3 is used as the installation position of the rotor 14. The magnetic ring 22 and the rotating shaft 21 of the rotor 14 are arranged at the position of the storage portion 18, thereby optimizing the structure and saving the number of components. At the same time, a hollow boss 15 is arranged on the motor mounting seat 1 to facilitate the insertion of the rotating shaft 21 into the boss 15 for positioning. At the same time, the iron core 19 and the coil 20 of the stator 13 can be sleeved on the boss 15 for positioning. The fan blade 3 is driven by the designed outer rotor brushless motor structure, which can be more compact in structure, save the number of components, and thus reduce costs.

[0043] refer to Figure 3As shown, the utility model also includes a driving circuit board 23, and the driving circuit board 23 is electrically connected to the motor 2 to drive the motor 2 to drive the fan blades 3 to rotate, and the airflow is accelerated through the first speed-increasing air duct 7 and the second speed-increasing air duct 12 in sequence and then blown out.

[0044] In implementation, the driving circuit board 23 can be built-in or external. When built-in, it can be installed on components such as the first shell 4 or the second shell 8. When external, it can be installed by setting up an additional shell. There is no limitation on this. The driving circuit board 23 is mainly used to drive and control various components.

[0045] refer to Figure 3 As shown, the utility model includes a shell 24, and the shell 24 is provided with a hollow accommodating portion 25 along the air inlet end to the air outlet end, and at least a portion of the accommodating portion 25 extends to the first shell 4 or the second shell 8; to form a package for the first shell 4 or the first shell 4 and the second shell 8, or to form a package in the first shell 4 or the first shell 4 and the second shell 8.

[0046] In a further technical solution, an outer shell 24 is added. The outer shell 24 is a hollow structure forming a receiving portion 25. The outer shell 24 can be set on one side of the first shell 4. In one implementation, the outer shell 24 can accommodate the first shell 4 and the second shell 8 inside through the receiving portion 25; in a second implementation, the outer shell 24 can accommodate the first shell 4 inside through the receiving portion 25; in a third implementation, the outer shell 24 can be accommodated in the first shell 4 and the second shell 8; in a fourth implementation, the outer shell 24 can be accommodated in the first shell 4.

[0047] Preferably, the blades 17 of the fan blades 3 are distributed counterclockwise from the air inlet end to the air outlet end. When the motor 2 rotates, the fan blades 3 are driven to rotate counterclockwise, so that the airflow direction entering the first speed-increasing air duct 7 is counterclockwise.

[0048] like Figure 3 As shown, it includes a power supply interface 26 for providing power, and the power supply interface 26 is electrically connected to the driving circuit board 23. The power supply interface 26 can be used as a connecting wire, such as using a plug and a socket to connect for power supply.

[0049] Preferably, the housing 24 is provided with an air inlet grille 27 at the air inlet end, and the air inlet grille 27 includes connecting strips evenly distributed around the circumference, and the connecting strips radially extend and connect to the inner wall of the housing 24 to form a gap to prevent foreign matter from entering.

[0050] Specifically, it includes a battery 28, and the battery 28 is electrically connected to the power supply interface 26 to charge and store electricity in the battery 28. Among them, the utility model also includes a battery 28, and the battery 28 can be powered by the power supply interface 26 to achieve battery life.

[0051] 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. An airflow speed increasing mixed flow generator, characterized in that: include: Motor mount; A motor, wherein the motor is arranged on the motor mounting seat; A fan blade, wherein the fan blade is arranged on an output end of the motor; A first shell, wherein the first shell is located at the air inlet end; the first shell includes a first outer ring and one or more first pressure sheets; the first pressure sheets are distributed on the inner wall of the first outer ring and extend to connect the outer peripheral edge of the motor mounting seat, and the radial cross-sectional thickness of the first pressure sheet near the air inlet end is less than the radial cross-sectional thickness of the first pressure sheet near the air outlet end; the inner wall of the first outer ring, the first pressure sheet 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 sheet, resulting in a smaller radial ventilation area, thereby pressurizing and increasing the speed of the airflow; A second shell, the second shell is located at the air outlet end and connected to the first shell; the second shell includes a second outer ring, a boost seat and one or more second pressurizing sheets; the second pressurizing sheets are distributed on the inner wall of the second outer ring and extend to the outer peripheral edge of the boost seat, and the radial cross-sectional thickness of the second pressurizing sheet near the air inlet end is less than the radial cross-sectional thickness of the second pressurizing sheet near the air outlet end; the inner wall of the second outer ring, the second pressurizing sheet and the boost seat form a second speed-increasing air duct, and the second speed-increasing air duct is increased by the second pressurizing sheet, resulting in a smaller radial ventilation area, thereby pressurizing and accelerating the airflow; Among them, the motor drives the fan blades to rotate, generating 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 sheet on the first outer ring and guided to the second speed-increasing air duct; the airflow is pressurized and blown out through the second pressure sheet in the second 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 and the second speed-increasing air duct; the airflow passes through the first pressure sheet and the second pressure sheet from the air inlet end to the air outlet end in turn to cut the airflow to reduce turbulent noise.

2. The airflow speed increasing mixed flow generator according to claim 1, characterized in that: The first pressure sheet is distributed clockwise or counterclockwise from the air inlet end to the air outlet end, so that the first pressure sheet 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; the second pressure sheet is distributed counterclockwise or clockwise from the air inlet end to the air outlet end, so that the second pressure sheet 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.

3. The airflow speed increasing mixed flow generator according to claim 1, characterized in that: The 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 the rotor is sleeved on the stator.

4. The airflow speed increasing mixed flow generator according to claim 3, 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 comprises a hub portion and blades evenly arranged on the outer peripheral surface of the hub portion, and the hub portion has a receiving portion that is recessed inwardly; The stator comprises an iron core inserted on the protruding column and a coil wound on the iron core; The rotor comprises 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.

5. The airflow speed increasing mixed flow generator according to claim 2 or 4, characterized in that: It includes a driving circuit board; the driving circuit board is electrically connected to the motor to drive the motor to drive the fan blades to rotate, and the airflow is accelerated through the first speed-increasing air duct and the second speed-increasing air duct in sequence and then blown out.

6. The airflow speed increasing mixed flow generator according to claim 5, characterized in that: It comprises a shell; the shell is provided with a hollow accommodating portion along the air inlet end to the air outlet end, and at least a part of the accommodating 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.

7. The airflow speed increasing mixed flow generator according to claim 5, characterized in that: The blades of the fan blade are distributed counterclockwise from the air inlet end to the air outlet end.

8. The airflow speed increasing mixed flow generator according to claim 5, 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.

9. The airflow speed increasing mixed flow generator according to claim 6, characterized in that: The housing is provided with an air inlet grille at the air inlet end; 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 housing to form a gap to prevent foreign matter from entering.

10. The airflow speed increasing mixed flow generator according to claim 8, characterized in that: It includes a battery; the battery is electrically connected to the power supply interface so as to charge the battery and store electricity.

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