A high pressure fan with a blade cover and a diffuser static wind channel

Abstract

The utility model discloses a high wind pressure fan with wind blade cover with pressure expansion static air channel, including the casing, rotor subassembly, stator subassembly, wind blade subassembly, the casing includes the inner wall and outer wall of coaxial connection, the wind blade subassembly includes wind blade and wind blade cover, be provided with static vane between the inner wall and the outer wall, the static vane is at the end face cooperation with wind blade, the air inlet angle of static vane and the rotation direction of wind blade are identical, form a static air channel between two adjacent static vanes, the shape of the cross section of static air channel is gradually enlarged shape away from the axle center, the outer wall has annular step structure, the annular step structure is located the outer surface or inner surface of the outer wall, one end of wind blade cover is assembled fixed with annular step structure and is limited, and the annular step structure is coaxial with stator installation cavity and first bearing installation cavity.

Description

Technical Field

[0001] This utility model relates to the technical field of high-speed, high-pressure fans, and in particular to a high-pressure fan with a diffuser duct and a fan blade cover. Background Technology

[0002] In achieving high-efficiency cleaning in modern vacuum cleaners, the fan, as a core component, directly determines the suction effect, and the diffusion capacity of the still air duct is crucial to improving the overall performance of the fan. With increasingly stringent consumer demands for cleaning efficiency and effectiveness, and the growing trend towards smarter and smaller vacuum cleaners requiring compact and efficient fans, the diffusion performance of the still air duct has become a key indicator for evaluating the technological level of vacuum cleaner fans. However, currently, most vacuum cleaners on the market suffer from diffusion failure in the still air duct of their fan housings, severely hindering improvements in cleaning performance.

[0003] From a structural design perspective, the geometry and dimensions of the static air ducts in existing vacuum cleaner fan casings lack scientific consideration. Some static air ducts have a single, uniform cross-sectional shape, failing to optimize according to airflow diffusion principles; for example, they use simple rectangular or circular cross-sections instead of a gradually expanding structure better suited to diffusion requirements. The expansion angle of the static air duct is also unreasonable; an excessively large angle can lead to airflow separation, forming vortices and causing energy loss; an excessively small angle fails to achieve sufficient diffusion. Furthermore, the connection between the static air duct and the impeller outlet and subsequent air ducts is not smooth, with abrupt structural changes such as steps and sharp angles, further exacerbating airflow turbulence and hindering the diffusion process. Existing vacuum cleaner fan designs often neglect the coordinated optimization of the static air duct with other components. The static air duct design does not fully consider the impeller's airflow output characteristics, resulting in a lack of proper matching. This prevents the impeller's output airflow from entering the static air duct in its optimal state, affecting the initial diffusion conditions and causing pressure loss during the airflow connection process after diffusion by the fan blades, thus weakening the performance improvement effect brought by diffusion. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, this utility model provides a high-pressure fan with a diffuser duct and a fan blade cover, which solves the technical problems that the static air duct of the casing of traditional vacuum cleaner fans cannot achieve the diffusion effect and that there is pressure loss when it works in conjunction with the fan blades.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a high-pressure blower with a diffuser duct and a blade cover, comprising a casing, a rotor assembly, a stator assembly, and a blade assembly. The casing includes an inner wall and an outer wall coaxially connected. The blade assembly includes a blade and a blade cover. A stationary blade is disposed between the inner wall and the outer wall. At the end face of the stationary blade that mates with the blade, the air inlet angle of the stationary blade is consistent with the rotation direction of the blade. A stationary duct is formed between two adjacent stationary blades. The cross-sectional shape of the stationary duct gradually expands away from the axis. The outer wall has an annular stepped structure. The annular stepped structure is located on the outer surface or the inner surface of the outer wall. One end of the blade cover is assembled, fixed, and limited with the annular stepped structure. The annular stepped structure is coaxial with the stator mounting cavity and the first bearing mounting cavity.

[0006] Preferably, the fan blade includes a hub and moving blades, the moving blades being evenly distributed on the mounting surface of the hub, the mounting surface being a rotating surface with an arc segment as its generatrix, the radius of the rotating surface gradually increasing from the air inlet end to the air outlet end.

[0007] Preferably, the width of the moving blade gradually decreases from the air inlet end to the air outlet end, and a moving air duct is formed between two adjacent moving blades, the cross-sectional area of ​​which gradually increases from the air inlet end to the air outlet end.

[0008] Preferably, the fit gap between the inner surface of the fan blade cover and the long side of the moving blade is 0.01-1.0 mm, and the fit gap is equal or gradually widens from the air inlet end to the air outlet end.

[0009] Preferably, the inner cavity of the inner wall includes a stator mounting cavity and a first bearing mounting cavity, and the space between the stator mounting cavity and the first bearing mounting cavity is a cavity with a positioning structure.

[0010] Preferably, the rotor assembly includes a shaft, a bearing, and a magnetic ring, with a limiting structure between the bearing and the magnetic ring, the limiting structure being an elastic or rigid element.

[0011] Preferably, the bearings are disposed at both ends of the magnetic ring or at the same end of the magnetic ring.

[0012] Preferably, it also includes an end cap, which is a front end cap or a rear end cap.

[0013] Preferably, the front end cover is located at the front port of the mounting cavity near the fan blade assembly of the housing, and a second bearing mounting cavity is provided in the front end cover. The first bearing mounting cavity is integrally formed with the housing, and the stator assembly, the fan blade assembly and the first bearing are all installed into the inner cavity of the inner wall from the front port.

[0014] Preferably, the rear end cover is located at the rear port of the housing near the stator mounting cavity, and a second bearing mounting cavity is provided in the rear end cover. The first bearing mounting cavity is integrally formed with the housing. The stator assembly and the first bearing are installed into the inner cavity of the inner wall from the rear port, and the fan blade assembly is fixedly connected to the shaft of the rotor assembly from the other end.

[0015] Compared with the prior art, the beneficial effects obtained by this utility model are:

[0016] This utility model discloses a high-pressure blower with a diffuser-type static air duct and a fan blade shroud, comprising a casing, a rotor assembly, a stator assembly, and a fan blade assembly. The casing includes an inner wall and an outer wall coaxially connected. The fan blade assembly includes a fan blade and a fan blade shroud. Static blades are disposed between the inner wall and the outer wall. At the end face of the static blade that mates with the fan blade, the air inlet angle of the static blade is consistent with the rotation direction of the fan blade. A static air duct is formed between two adjacent static blades. The cross-sectional shape of the static air duct gradually increases in size as it moves away from the axis. The outer wall has an annular stepped structure, which is located on the outer surface of the outer wall or... On the inner surface, one end of the fan blade cover is assembled, fixed, and limited with the annular stepped structure. The annular stepped structure is coaxial with the stator mounting cavity and the first bearing mounting cavity. The design of the static air duct with a diffusion structure and the design of the expansion angle of the static air duct being consistent with the rotation angle of the fan blade effectively converts the high-speed airflow output by the fan blade into high-pressure airflow. This solves the technical problems of traditional vacuum cleaner fans where the static air duct of the casing cannot achieve a diffusion effect and where there is pressure loss when working in conjunction with the fan blade. By increasing the gas pressure through the diffusion process, the suction power of the vacuum cleaner is enhanced, achieving the beneficial effect of deep cleaning of dust and stubborn dirt in the crevices of carpets. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of a high-pressure blower with a front end cover, a diffuser air duct, and a fan blade cover, according to Embodiment 1 of this utility model.

[0019] Figure 2 This is a schematic diagram of a high-pressure blower with a rear end cover, a diffuser air duct, and a fan blade cover, according to Embodiment 1 of this utility model.

[0020] Figure 3 This is a schematic diagram of the casing of a high-pressure fan with a front end cover, a diffuser air duct, and a fan blade cover, according to Embodiment 1 of this utility model.

[0021] Figure 4 This is a schematic diagram of the casing of a high-pressure fan with a rear end cover, a diffuser duct, and a fan blade cover, according to Embodiment 1 of this utility model.

[0022] Figure 5 This is a schematic diagram of the back cover with an external stop structure according to Embodiment 1 of this utility model.

[0023] Figure 6 This is a schematic diagram of the back cover with an inner stop structure according to Embodiment 1 of this utility model.

[0024] Figure 7 This is a schematic diagram of the fan blades of a high-pressure fan with a front cover, a diffuser air duct, and a fan blade cover, according to the present invention.

[0025] Figure 8 This is a schematic diagram of the stationary fan blade of a high-pressure fan with a front cover, a diffuser air duct, and a fan blade cover, according to the present invention.

[0026] Figure 9 This is a cross-sectional view of a high-pressure blower with a front end cover, a diffuser duct, and a fan blade cover, according to Embodiment 2 of this utility model.

[0027] Figure 10 This is a schematic diagram of a high-pressure fan with a front end cover, a diffuser air duct, and a fan blade cover, according to Embodiment 2 of this utility model.

[0028] Reference numerals: 1-Housing; 11-Inner wall; 111-Stator mounting cavity; 112-First bearing mounting cavity; 113-Positioning structure; 12-Outer wall; 121-Annular stepped structure; 13-Stationary blade; 2-Rotor assembly; 21-Shaft; 22-Bearing; 23-Magnetic ring; 24-Limiting structure; 3-Stator assembly; 4-Fan blade assembly; 41-Fan blade; 411-Hub; 412-Moving blade; 42-Fan blade cover; 5-End cover; 51-Second bearing mounting cavity; 52-Outer stop structure; 53-Inner stop structure. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Wherein, width represents the dimension along the radial direction (perpendicular to the axis of rotation), and length represents the dimension along the axial direction (along the axis of rotation).

[0030] Example 1

[0031] Please see Figures 1 to 8A high-pressure fan with a diffuser duct and a fan blade cover, supported at both ends, includes a housing 1, a rotor assembly 2, a stator assembly 3, a fan blade assembly 4, and an end cover 5. The housing 1 includes an inner wall 11 and an outer wall 12 coaxially connected. The inner cavity of the inner wall 11 includes a stator mounting cavity 111 and a first bearing mounting cavity 112. The space between the stator mounting cavity 111 and the first bearing mounting cavity 112 is a cavity with a positioning structure 113. The positioning structure 113 is a limiting boss that is higher than the inner surface of the inner wall 11.

[0032] The end cover 5 is provided with a second bearing mounting cavity 51, which is used to install a second bearing. The end cover 5 and the housing 1 are fitted together by an outer stop structure 52 with a stepped structure on the annular outer surface of the end cover 5 for limiting the fit. The end cover 5 is nested into the inner wall 11 of the housing 1. The outer stop structure 52 is used to limit the depth of the end cover 5 nested in. In another embodiment, the annular inner surface of the end cover 5 has a stepped structure for limiting the fit, namely an inner stop structure 53. The end of the inner wall 11 is embedded in the end cover 5 with the inner stop structure. The inner stop structure 53 is used to limit the depth of the end of the inner wall 11 nested in.

[0033] The end cover 5 is a front end cover, which is located at the front port of the mounting cavity near the fan blade assembly 4 of the housing 1. The first bearing mounting cavity 112 is integrally formed with the housing 1. The stator assembly 3, the fan blade assembly 4, and the first bearing are all installed into the inner cavity of the inner wall from the front port. In another embodiment, the end cover 5 is a rear end cover, which is located at the rear port of the housing 1 near the stator mounting cavity 111. The rear end cover has a second bearing mounting cavity 51. The first bearing mounting cavity 112 is integrally formed with the housing 1. The stator assembly 3 and the first bearing are installed into the inner cavity of the inner wall from the rear port. The fan blade assembly 4 is fixedly connected to the shaft 21 of the rotor assembly 2 from the other end.

[0034] The outer wall 12 has an annular stepped structure 121, which is located on the outer or inner surface of the outer wall 12. The fan blade assembly 4 includes a fan blade 41 and a fan blade cover 42. One end of the fan blade cover 42 is assembled, fixed, and positioned with the annular stepped structure 121. The annular stepped structure 121 is coaxial with the stator mounting cavity 111 and the first bearing mounting cavity 112. The fan blade 41 includes a hub 411 and moving blades 412. The moving blades 412 are evenly distributed on the mounting surface of the hub 411. The mounting surface is a rotating surface with an arc segment as its generatrix, and the radius of the rotating surface gradually increases from the air inlet end to the air outlet end. The width of the moving blades 412 increases from the air inlet end to the air outlet end. The airflow tapers towards the inlet, forming a dynamic airflow duct between two adjacent moving blades. The cross-sectional area of ​​this duct gradually increases from the inlet to the outlet. The cross-sectional area of ​​the outlet of the moving blade 412 is more than 1.1 times that of the inlet, with a diffusion coefficient of less than 3 (the rate of change of cross-sectional area within a 1mm range). The number of moving blades 412 is greater than 3. The gradually increasing airflow duct ensures that the fluid velocity at the outlet of the fan blade is significantly higher than that at the inlet, increasing the fluid flow from the inlet to the outlet and improving the fan blade efficiency. When high-speed fluid flows through the blades, the pressure difference between the upper and lower blades easily creates vortices inside the blades. With more than 3 blades and a diffusion coefficient of less than 3, the pressure difference inside the fan blades is greatly reduced, vortices are decreased, and motor efficiency is improved.

[0035] The fitting gap between the inner surface of the fan blade cover 42 and the long side of the moving blade 412 is 0.01-1.0mm. The fitting gap is equal or gradually widens from the air inlet end to the air outlet end, and the widening coefficient is greater than or equal to 1. A stationary blade 13 is provided between the inner wall 11 and the outer wall 12. The two ends of the stationary blade 13 are fixedly connected to the inner wall 11 and the outer wall 12. At the end face of the stationary blade 13 that mates with the fan blade 41, the air inlet angle of the stationary blade 13 is consistent with the rotation direction of the fan blade 41. A stationary air duct is formed between two adjacent stationary blades 13. The cross-sectional shape of the stationary air duct gradually widens as it moves away from the axis. In another embodiment, the stationary blade 13 is a detachable component.

[0036] The rotor assembly 2 includes a shaft 21, a bearing 22, and a magnetic ring 23. A limiting structure 24 is provided between the bearing 22 and the magnetic ring 23. The limiting structure 24 is a spring; in another embodiment, the limiting structure 24 is a rigid metal component. The bearing 22 is disposed at both ends of the magnetic ring 23, meaning the motor is a motor with a two-end support structure. In another embodiment, the bearing 22 is disposed at the same end of the magnetic ring 23.

[0037] Example 2

[0038] Please see Figures 7 to 10A high-pressure fan with a diffuser duct and fan blade cover, supported by a cantilever structure, includes a housing 1, a rotor assembly 2, a stator assembly 3, and a fan blade assembly 4. The housing 1 includes an inner wall 11 and an outer wall 12 coaxially connected. The inner cavity of the inner wall 11 includes a stator mounting cavity 111 and a first bearing mounting cavity 112. A cavity with a positioning structure 113 is located between the stator mounting cavity 111 and the first bearing mounting cavity 112. The positioning structure 113 is a limiting boss protruding above the inner surface of the inner wall 11, used to limit the axial movement of the stator assembly 2. Two bearings 22 are installed in the first bearing mounting cavity 112. A limiting structure, such as a metal bearing sleeve or a spring, is provided between the bearings 22. The shaft 21 of the rotor assembly 2 passes through the bearing hole of the first bearing mounting cavity 112. One end of the shaft 21 is connected to the bearing 22, the other end of the bearing 22 is connected to the magnetic ring 23, and the other end of the shaft 21 is connected to the fan blade assembly 4, forming a fan with a cantilever beam structure.

[0039] The outer wall 12 has an annular stepped structure 121, which is located on the outer or inner surface of the outer wall 12. The fan blade assembly 4 includes a fan blade 41 and a fan blade cover 42. One end of the fan blade cover 42 is assembled, fixed, and positioned with the annular stepped structure 121. The annular stepped structure 121 is coaxial with the stator mounting cavity 111 and the first bearing mounting cavity 112. The cross-section of the annular stepped structure 121 is wedge-shaped, with the sloped side facing the fan blade cover 42, which facilitates the direct snap-fit ​​and fixation of the fan blade cover 42 onto the outer wall 12. After assembly, axial positioning is achieved through the vertical surface of the step, ensuring the stability of the fan blade assembly 4 during operation.

[0040] The fan blade 41 includes a hub 411 and moving blades 412. The hub 411 is integrally molded from high-strength aluminum alloy or engineering plastic, which has good lightweight and rigidity. The hub 411 has a shaft hole in the center, which is connected to the motor shaft by a key or interference fit to ensure reliable transmission. The inner wall of the shaft hole is provided with anti-slip texture to enhance the stability of the connection.

[0041] The moving blades 412 are evenly distributed on the mounting surface of the hub 411, typically numbering 6-12. The mounting surface is a rotating surface with an arc segment as its generatrix, the radius of which gradually increases from the inlet to the outlet, forming a unique gradually expanding blade layout. The width of the moving blades 412 gradually decreases from the inlet to the outlet, typically 15-25mm at the inlet and 8-15mm at the outlet. The moving blades 412 employ aerodynamic design, featuring a streamlined cross-section and a thickness that gradually decreases from the root to the tip, approximately 3-5mm at the root and 1-2mm at the tip. A dynamic airflow channel is formed between adjacent moving blades, with its cross-sectional area gradually increasing from the inlet to the outlet, approximately 200-400mm² at the inlet and 400-800mm² at the outlet, helping to reduce wind resistance and improve airflow acceleration.

[0042] The fit clearance between the inner surface of the fan blade cover 42 and the long side of the moving blade 412 is 0.01-1.0mm. The fit clearance can be designed to be equal from the air inlet end to the air outlet end to ensure the uniformity of airflow; or it can be designed to be gradually expanded, with a gap of 0.01mm at the air inlet end and a gap of 1.0mm at the air outlet end, to further reduce airflow leakage and improve fan efficiency.

[0043] A stationary blade 13 is provided between the inner wall 11 and the outer wall 12. It is made of sheet metal, stamped and then surface-treated, such as anodized or painted, to improve corrosion resistance. At the end face of the stationary blade 13 that mates with the fan blade 41, the air inlet angle of the stationary blade 13 is consistent with the rotation direction of the fan blade 41, typically 20°-45°. This angle is optimized through aerodynamic simulation to effectively guide the airflow discharged from the fan blade 41 and reduce turbulence. A stationary air duct is formed between two adjacent stationary blades 13. The cross-sectional shape of the stationary air duct gradually expands away from the axis, and its specific shape can be approximated as a trapezoid or a gradually opening arc. This shape helps reduce airflow pressure loss and allows for smoother airflow discharge. The length of the stationary blade 13 is determined by the distance between the inner wall 11 and the outer wall 12, generally between 30-80 mm, and the thickness of the stationary blade 13 is approximately 1-3 mm to ensure sufficient strength and rigidity.

[0044] The stator assembly 3 includes a stator core, stator windings, insulation structure, and base. The stator core is made of high-permeability silicon steel sheets with a thickness of 0.35-0.5mm, and the surface of the silicon steel sheets is coated with an insulating coating with a thickness of approximately 0.02-0.03mm to reduce eddy current losses. The stator core has uniformly distributed stator slots on its inner circumference. The slot type is usually semi-closed or open, and the number of slots is determined according to the number of poles and power of the motor, generally between 24 and 48 slots. The outer diameter of the stator core is designed according to the motor power. For small-power motors (<500W), the outer diameter of the core is approximately 80-120mm, while for large-power motors (≥500W), the outer diameter can reach 150-200mm. The two ends of the stator core are fastened with pressure rings and bolts to ensure that the stacking coefficient is not less than 0.95. The stator windings are made of high-strength enameled round copper wire, with the enamel coating of polyesterimide-polyamideimide composite coating, achieving a heat resistance rating of H (180℃). The stator windings are typically double-layered, with a pitch of y = (0.8 - 0.9)τ (τ being the pole pitch). Each phase winding consists of multiple coil groups connected in series or parallel, with star (Y) or delta (△) connections depending on the motor design requirements. The ends of the stator windings are secured with cable ties or thermosetting resin to prevent loosening due to vibration during motor operation. The insulation structure consists of slot insulation placed within the stator slots, using DMD (polyester film-polyester fiber nonwoven composite foil) material with a thickness of approximately 0.2-0.3 mm. The slot insulation extends 5-8 mm beyond the core slot openings at both ends to enhance insulation performance. Phase-to-phase insulation, also made of DMD material, is used between the stator windings and the stator core to ensure electrical isolation between each phase winding. For high-voltage motors, anti-corona treatment is applied to the winding ends by coating with semiconductor paint or wrapping with semiconductor tape to reduce the electric field strength at the ends and prevent partial discharge. The frame is made of die-cast aluminum alloy or stamped steel plate. Aluminum alloy frames are lightweight and have good heat dissipation, while steel plate frames are high-strength and low-cost. The inner wall of the frame is fixed to the stator core by interference fit or epoxy resin bonding to ensure that the stator core does not shift during motor operation. The frame is equipped with heat dissipation fins. The height and spacing of the heat dissipation fins are designed according to the motor power and heat dissipation requirements. Typically, the height of the heat dissipation fins is 15-30mm and the spacing is 20-40mm to increase the heat dissipation area and improve heat dissipation efficiency.

[0045] It also includes a PCB board, which is fixedly installed at the end of the stator assembly 3, and is fixedly connected by positioning posts and positioning holes, and is insulated and shielded.

[0046] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and many similar modifications are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this utility model should be considered within the scope of protection of this utility model.

Claims

1. A high-pressure fan with a diffuser duct and a fan blade cover, characterized in that, The device includes a housing, a rotor assembly, a stator assembly, and a fan blade assembly. The housing includes an inner wall and an outer wall coaxially connected. The fan blade assembly includes a fan blade and a fan blade cover. A stationary blade is disposed between the inner wall and the outer wall. The air inlet angle of the stationary blade is consistent with the rotation direction of the fan blade at the end face that mates with the fan blade. A stationary air duct is formed between two adjacent stationary blades. The cross-sectional shape of the stationary air duct gradually expands away from the axis. The outer wall has an annular stepped structure located on the outer or inner surface of the outer wall. One end of the fan blade cover is assembled, fixed, and limited with the annular stepped structure. The annular stepped structure is coaxial with the stator mounting cavity and the first bearing mounting cavity.

2. The high-pressure fan with a diffuser duct and blade cover as described in claim 1, characterized in that, The fan blades include a hub and moving blades. The moving blades are evenly distributed on the mounting surface of the hub. The mounting surface is a rotating surface with an arc segment as its generatrix, and the radius of the rotating surface gradually increases from the air inlet end to the air outlet end.

3. The high-pressure fan with a diffuser duct and blade cover as described in claim 2, characterized in that, The width of the moving blade gradually decreases from the air inlet end to the air outlet end, and a moving air duct is formed between two adjacent moving blades. The cross-sectional area of ​​the moving air duct gradually increases from the air inlet end to the air outlet end.

4. The high-pressure fan with a diffuser duct and blade cover as described in claim 2, characterized in that, The fit clearance between the inner surface of the fan blade cover and the long side of the moving blade is 0.01-1.0 mm, and the fit clearance is equal or gradually widens from the air inlet end to the air outlet end.

5. The high-pressure fan with a diffuser duct and blade cover as described in claim 1, characterized in that, The inner wall cavity includes a stator mounting cavity and a first bearing mounting cavity, and the space between the stator mounting cavity and the first bearing mounting cavity is a cavity with a positioning structure.

6. The high-pressure fan with a diffuser duct and blade cover as described in claim 1, characterized in that, The rotor assembly includes a shaft, a bearing, and a magnetic ring. A limiting structure is included between the bearing and the magnetic ring. The limiting structure is an elastic element or a rigid element.

7. The high-pressure blower with a diffuser duct and blade cover as described in claim 6, characterized in that, The bearings are located at both ends of the magnetic ring or at the same end of the magnetic ring.

8. The high-pressure fan with a diffuser duct and blade cover as described in claim 1, characterized in that, It also includes end caps, which are either front end caps or rear end caps.

9. The high-pressure fan with a diffuser duct and blade cover as described in claim 8, characterized in that, The front end cover is located at the front port of the mounting cavity near the fan blade assembly of the housing. A second bearing mounting cavity is provided in the front end cover. The first bearing mounting cavity is integrally formed with the housing. The stator assembly, the fan blade assembly, and the first bearing are all installed into the inner cavity of the inner wall from the front port.

10. The high-pressure fan with a diffuser duct and blade cover as described in claim 8, characterized in that, The rear end cover is located at the rear port of the housing near the stator mounting cavity. A second bearing mounting cavity is provided in the rear end cover. The first bearing mounting cavity is integrally formed with the housing. The stator assembly and the first bearing are installed into the inner cavity of the inner wall from the rear port. The fan blade assembly is fixedly connected to the shaft of the rotor assembly from the other end.

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