A high-speed mixed-flow impeller structure

Abstract

This invention provides a high-speed mixed-flow impeller structure, specifically relating to the field of small high-speed vacuum cleaner fans. The structure includes a mixed-flow impeller, a front guide vane, a rectifier and guide assembly, and a built-in high-speed brushless motor assembly. The mixed-flow impeller adopts a three-dimensional twisted mixed-flow structure with a blade inlet installation angle of 30°–70° and an outlet installation angle of 15°–35°. The front guide vane is a wave-shaped spatial twisted structure, positioned upstream of the impeller to achieve airflow pre-swirl and rectification. The rectifier and guide assembly is located downstream of the impeller and consists of an outer cylinder, an inner cylinder, and circumferentially evenly distributed guide vanes forming an independent guide channel. This invention provides excellent airflow rectification, stable operation, and effectively improves fan pressure, air volume, and operational stability, making it suitable for high-performance equipment such as small high-speed vacuum cleaner fans.

Description

Technical Field

[0001] This invention provides a high-speed mixed-flow impeller structure, specifically relating to the field of small high-speed vacuum cleaner fan technology. Background Technology

[0002] Currently, household vacuum cleaners are trending towards lightweight, miniaturized, and integrated designs, with market demand for high-speed, small-sized core fans continuing to rise. As a key component for the suction output of the entire machine, the vacuum cleaner fan must balance high aerodynamic efficiency and sufficient pressure rise capacity within limited installation space and extremely small dimensions to meet the requirements of efficient vacuuming operations.

[0003] However, the existing impeller structure has the following defects: As shown in the attached diagram in the instruction manual ( Figure 1 and Figure 11 As shown in the figure, the "impeller structure of the prior art" mainly includes: 1. a mixed flow impeller; 2. a fan casing.

[0004] The existing technology does not have a front guide vane and a flow straightening component, so it cannot pre-rotate, regulate and guide the airflow entering the impeller, resulting in turbulence when the airflow enters the impeller and affecting the working efficiency of the fan. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a high-speed mixed-flow impeller structure, which can effectively solve the related technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A high-speed mixed-flow impeller structure includes: A mixed-flow impeller, wherein the mixed-flow impeller has a three-dimensional twisted mixed-flow structure, and the blade inlet installation angle is 30°-70° and the outlet installation angle is 15°-35°; The front guide vane is a wave-shaped spatial twisted vane structure, coaxially arranged upstream of the mixing flow impeller; A rectifier and guide assembly is coaxially disposed downstream of the mixing impeller and includes an outer cylinder, an inner cylinder, and a guide vane assembly, wherein the guide vane assembly is evenly distributed circumferentially between the outer cylinder and the inner cylinder.

[0007] Furthermore, the mixing impeller includes a hub and multiple mixing blades, the mixing blades being evenly distributed along the circumference of the hub.

[0008] Furthermore, a shaft hole is provided at the center of the hub.

[0009] Furthermore, the inner wall of the hub is provided with a first rectangular slot.

[0010] Furthermore, the front guide vane includes an annular base and multiple guide vanes. The annular base is coaxially fixed upstream of the mixing impeller, and the guide vanes are evenly distributed along the circumference of the annular base.

[0011] Furthermore, the inner cylinder has a hollow structure, forming a cavity inside.

[0012] Furthermore, the inner wall of the inner cylinder is evenly provided with three positioning slots circumferentially.

[0013] Furthermore, the high-speed mixed-flow impeller structure also includes a built-in high-speed brushless motor assembly, which is fixedly installed in the cavity of the inner cylinder and includes a stator assembly, a rotor assembly, and a drive control board. The stator assembly includes a stator core, a stator winding, and a stator frame. The stator core is nested and fixed inside the stator frame, and the stator winding is wound between the stator core and the stator frame. The rotor assembly includes a motor shaft and a permanent magnet rotor. The motor shaft is coaxially connected to the mixing flow impeller, and the permanent magnet rotor is coaxially sleeved and fixed to the outer circumference of the motor shaft. The drive control board is located at the axial end of the stator assembly and is electrically connected to the stator winding.

[0014] Furthermore, the outer wall of the stator frame is fixedly and closely connected to the inner wall of the inner cylinder.

[0015] Furthermore, the stator frame has three arc-shaped bosses evenly arranged on its outer wall, and these arc-shaped bosses are adapted to the circumferential positioning grooves of the inner cylinder.

[0016] Furthermore, a second rectangular slot is provided at one end of the motor shaft.

[0017] Furthermore, the permanent magnet rotor is located inside the stator core, and the two are arranged coaxially with the outer circle forming a uniform air gap between the outer circle and the inner hole of the stator core.

[0018] Furthermore, the high-speed mixed-flow impeller structure also includes a flat key, one side of which is embedded in the first rectangular slot of the hub, and the other side is embedded in the second rectangular slot of the motor shaft.

[0019] Furthermore, the high-speed mixed-flow impeller structure also includes a fan housing, which is coaxially mounted on the outside of the mixed-flow impeller and the front guide vane, and includes an air inlet section, a mounting flange and a receiving cavity, which is coaxially arranged with the mixed-flow impeller.

[0020] Furthermore, one end of the air intake section is provided with an arc transition surface.

[0021] Furthermore, the mounting flange is fixedly connected to one end of the outer cylinder.

[0022] Compared with the known prior art, the technical solution provided by this invention has the following beneficial effects: Firstly, the aerodynamic efficiency is significantly improved: the three-dimensional twisted mixed flow impeller, combined with an inlet installation angle of 30°-70° and an outlet installation angle of 15°-35°, results in higher efficiency in airflow work and energy conversion, and can obtain greater wind pressure and air volume at the same speed.

[0023] Secondly, it has excellent airflow stability and rectification effect: the upstream is equipped with a wave-shaped spatial twisted front guide vane to achieve airflow pre-swirl and uniform rectification, reducing intake turbulence and impact loss; the downstream is equipped with an independent guide channel rectification and guide component to efficiently guide the outflow, reduce eddy current and airflow separation, and improve the operating stability at high speed.

[0024] Thirdly, it has a compact structure and high integration: the hollow inner cylinder design can house a high-speed brushless motor assembly, realizing the integration of the impeller and the motor, which greatly reduces the overall size of the fan and meets the requirements of lightweight and miniaturized equipment.

[0025] Fourth, it is suitable for ultra-high speed operation: the structural strength and aerodynamic design are matched with the high speed characteristics, and it still maintains low loss and high stability at high speed, making it suitable for high-performance scenarios such as high-speed vacuum cleaner fans. Attached Figure Description

[0026] Figure 1 This is a front-view perspective view of a high-speed mixed-flow impeller structure proposed in this invention; Figure 2 This is a structural diagram of a high-speed mixed-flow impeller proposed in this invention; Figure 3 This is a schematic diagram of the shaft hole of a high-speed mixed-flow impeller structure hub proposed in this invention; Figure 4 This is a schematic diagram of the first rectangular slot of a high-speed mixed-flow impeller structure hub proposed in this invention; Figure 5 This is a structural diagram of the front guide vane of a high-speed mixed-flow impeller structure proposed in this invention; Figure 6 This is a structural diagram of the inner cylinder positioning groove of a high-speed mixed-flow impeller structure proposed in this invention; Figure 7 This is a structural diagram of a motor assembly with a high-speed mixed-flow impeller structure proposed in this invention; Figure 8 This is a schematic diagram of the arc boss of the stator frame of a high-speed mixed-flow impeller structure proposed in this invention; Figure 9This is a schematic diagram of the second rectangular slot of a high-speed mixed-flow impeller structure motor shaft proposed in this invention; Figure 10 This is a schematic diagram of a flat key for a high-speed mixed-flow impeller structure proposed in this invention; Figure 11 This is a structural diagram of a fan casing for a high-speed mixed-flow impeller structure proposed in this invention.

[0027] The labels in the diagram represent: 1-Mixed flow impeller, 11-Hub, 111-Shaft hole, 112-First rectangular slot, 12-Mixed flow blade, 2-Front guide vane, 21-Annular base, 22-Guide vane, 3-Rectifying and guiding assembly, 31-Outer cylinder, 32-Inner cylinder, 321-Positioning slot, 33-Guide vane assembly, 4-Motor assembly, 41-Stator assembly, 411-Stator core, 412-Stator winding, 413-Stator frame, 4131-Circular arc boss, 42-Rotor assembly, 421-Motor shaft, 4211-Second rectangular slot, 422-Permanent magnet rotor, 43-Drive control board, 5-Flat key, 6-Fan housing, 61-Inlet section, 62-Mounting flange, 63-Receiving cavity. Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments.

[0029] Current technologies in the field of small high-speed vacuum cleaner fans suffer from shortcomings such as insufficient aerodynamic performance, large structural size, low integration, and poor stability under high-speed operating conditions. These shortcomings are specifically reflected in the following aspects: First, in terms of aerodynamic design, traditional impellers mostly adopt conventional axial or centrifugal structures, with simple blade profiles, poor airflow matching, insufficient inlet pre-swirl, and weak outflow rectification effect. They are prone to airflow impact, eddies, and flow separation, resulting in low aerodynamic efficiency and insufficient pressure boost, which cannot meet the requirements of high suction power and high efficiency of the whole machine.

[0030] Secondly, in terms of structural layout, conventional fans mostly adopt a separate arrangement of motor and impeller, with large axial and radial dimensions, making it difficult to adapt to compact installation environments; at the same time, the design of the flow guide component channel is unreasonable, resulting in large airflow loss, and under high speed conditions, it is prone to problems such as increased vibration and poor operating stability.

[0031] Third, in terms of integration, existing fans have not achieved integrated built-in design of impeller, guide structure and high-speed motor. The overall number of parts is large, the assembly is complicated, the space utilization rate is low, and it is difficult to meet the development requirements of miniaturized and integrated products.

[0032] To overcome the aforementioned drawbacks, the present invention employs the following embodiments to address the current situation.

[0033] Example 1: Reference Appendix Figure 1 This is a front-view three-dimensional structural diagram of a high-speed mixed-flow impeller, which includes: The mixed-flow impeller 1 has a three-dimensional twisted mixed-flow structure, with a blade inlet installation angle of 30°-70° and an outlet installation angle of 15°-35°. The front guide vane 2 is a wave-shaped spatial twisted vane structure, coaxially arranged upstream of the mixed flow impeller 1. The rectifier and guide assembly 3 is coaxially disposed downstream of the mixing impeller 1, and includes an outer cylinder 31, an inner cylinder 32 and a guide vane group 33. The guide vane group 33 is evenly distributed circumferentially between the outer cylinder 31 and the inner cylinder 32.

[0034] In this example, the upstream wave-shaped spatially twisted front guide vane 2 pre-swirls and regulates the airflow entering the impeller, eliminating intake turbulence, reducing airflow impact loss, and providing uniform airflow to the moving impeller; a three-dimensional twisted mixed flow impeller, with an inlet installation angle of 30°-70° and an outlet installation angle of 15°-35°, performs work on the airflow, increases airflow pressure and kinetic energy, and achieves efficient energy conversion; the downstream rectifier and guide assembly forms an independent guide channel to guide the impeller outflow, suppress eddies and flow separation, and ensure stable airflow output.

[0035] like Figure 2 As shown, in another embodiment, the mixing impeller 1 includes a hub 11 and multiple mixing blades 12, which are evenly distributed around the hub 11.

[0036] Multiple mixing blades 12 are evenly distributed around the hub 11, ensuring uniform airflow and symmetrical force distribution around the impeller circumference, avoiding localized airflow imbalance, and improving operational stability at high speeds. The blades and hub 11 form an integrated working structure, allowing airflow to flow stably along the three-dimensional twisted blade surface, reducing separation losses and ensuring stable pressure and airflow output. Combined with an inlet installation angle of 30°-70° and an outlet installation angle of 15°-35°, it efficiently completes airflow energy conversion, increasing wind pressure and airflow.

[0037] The hub 11 serves as the mounting carrier for the mixing blades 12, providing stable support and a uniformly distributed foundation for the multiple mixing blades 12; the center is used to connect with the motor shaft 421 to transmit high-speed torque and ensure stable rotation of the impeller.

[0038] like Figure 3 As shown, in one embodiment, the hub 11 has a shaft hole 111 at its center.

[0039] A shaft hole 111 is opened in the center of the hub 11 to provide an assembly channel for the motor shaft 421 to be coaxially mounted, precisely positioned and reliably connected, ensuring that the impeller and the motor shaft are assembled concentrically, avoiding high-speed eccentricity and vibration, and ensuring stable power transmission.

[0040] The motor shaft 421 passes through and is fitted into the shaft hole 111, achieving a coaxial connection between the impeller and the motor, ensuring assembly accuracy, reducing radial runout, and adapting to high-speed stable operation. The shaft hole 111, as the core mating structure for power transmission, allows torque to be efficiently and losslessly transmitted from the motor to the impeller.

[0041] like Figure 4 As shown, in one embodiment, the inner wall of the hub 11 is provided with a first rectangular slot 112.

[0042] A first rectangular slot 112 is provided on the inner wall of the hub 11 for mounting a flat key 5, so as to prevent slippage, prevent circumferential rotation, and reliably transmit large torque between the hub 11 and the motor shaft 421, ensuring that there is no loss of rotation or loosening at high speed.

[0043] The first rectangular slot 112 provides a mounting and positioning slot for the flat key 5, which is aligned with the slot on the motor shaft 421 to form a key connection structure. It also serves as a circumferential locking mechanism to prevent the impeller from rotating relative to the motor shaft, ensuring complete torque transmission, improving the reliability of high-speed operation, and avoiding slippage, eccentricity, and vibration at high speeds.

[0044] like Figure 5 As shown, in one embodiment, the front guide vane 2 includes an annular base 21 and multiple guide vanes 22. The annular base 21 is coaxially fixed upstream of the mixing impeller 1, and the guide vanes 22 are evenly distributed around the annular base 21.

[0045] The annular base 21 is coaxially fixed upstream of the mixed flow impeller 1, providing a precise positioning and installation reference for the guide vanes 22, ensuring the coaxiality of the vanes and the impeller, and avoiding vibration and airflow deviation caused by eccentricity. The multiple circumferentially evenly distributed guide vanes 22 can evenly split and regulate the flow direction of the intake air, making the intake air split uniform, eliminating intake turbulence and eddies, reducing airflow impact loss, and providing a preset swirl direction for the airflow according to the aerodynamic design, so that the airflow enters the impeller at a matching angle, improving the working efficiency. The circumferentially even arrangement can make the force symmetrical, reducing aerodynamic noise and structural vibration during high-speed operation.

[0046] In one embodiment, the inner cylinder 32 has a hollow structure, with a cavity formed inside.

[0047] The inner cylinder 32 has a hollow structure and forms a cavity, providing a dedicated installation space for the motor assembly 4.

[0048] The inner cylinder 32 is designed as a hollow structure to form a cavity, providing a dedicated installation space for the built-in high-speed brushless motor assembly 4, realizing the integrated integration of the motor and the flow guiding structure, greatly reducing the overall volume of the fan, and meeting the requirements of miniaturization and lightweight design.

[0049] The hollow cavity inside the inner cylinder allows the motor to be built into the flow guide component, reducing axial and radial dimensions, maintaining high coaxiality between the motor, impeller, and flow guide components, ensuring stable operation at high speeds, and also improving structural compactness, making it suitable for the narrow installation space of small high-speed vacuum cleaner fans.

[0050] like Figure 6 As shown, in one embodiment, the inner wall of the inner cylinder 32 is provided with three positioning slots 321 evenly arranged circumferentially.

[0051] The three positioning slots 321 engage with the three arc-shaped protrusions 4131 on the motor stator frame 413 to restrict the circumferential rotation of the motor and prevent the motor from surging at high speeds.

[0052] Three circumferentially uniform positioning slots 321 are provided on the inner wall of the inner cylinder 32 to engage with the arc bosses 4131 on the motor stator frame 413, so as to realize the circumferential positioning of the motor stator, prevent rotation and movement, and ensure that the motor is installed stably and does not deviate at high speed.

[0053] The three slots of the positioning slot 321 are evenly distributed, which makes the force symmetrical, improves the stability of high-speed operation, and can quickly position and assemble through the cooperation of the slots and the boss, improve the assembly accuracy, and reduce eccentricity and vibration.

[0054] like Figure 7 As shown, in one embodiment, the high-speed mixed-flow impeller structure further includes a built-in high-speed brushless motor assembly 4, which is fixedly installed in the cavity of the inner cylinder 32 and includes a stator assembly 41, a rotor assembly 42 and a drive control board 43. The stator assembly 41 includes a stator core 411, a stator winding 412, and a stator frame 413. The stator core 411 is nested and fixed inside the stator frame 413, and the stator winding 412 is wound between the stator frame 413 and the stator core 411. The rotor assembly 42 includes a motor shaft 421 and a permanent magnet rotor 422. The permanent magnet rotor 422 is coaxially sleeved and fixed to the outer periphery of the motor shaft 421. The motor shaft 421 is coaxially connected to the mixed flow impeller 1. The drive control board 43 is located at the axial end of the stator assembly 41 and is electrically connected to the stator winding 412.

[0055] The built-in high-speed brushless motor assembly 4 is fixed inside the cavity of the inner cylinder 32, providing high-speed power to the mixed flow impeller 1, realizing the integrated integration of the motor, impeller, and guide structure, reducing the size of the fan, and ensuring stable operation at high speed.

[0056] The stator core 411 serves as the core of the motor's magnetic circuit, providing a magnetic path and working with the permanent magnet rotor 422 to generate electromagnetic torque, supporting the high-speed operation of the motor. The stator winding 412 generates a rotating magnetic field after being energized, driving the permanent magnet rotor 422 to rotate at high speed, and is the core component for converting electrical energy into mechanical energy. The stator frame 413 fixes the stator core 411, insulates and isolates the stator winding, and fits and positions itself against the inner cylinder 32, ensuring that the stator is installed stably and has precise coaxiality.

[0057] The motor shaft 421 transmits the torque output by the motor and is coaxially connected to the mixed flow impeller 1, directly driving the impeller to rotate at high speed to do work; the permanent magnet rotor 422 rotates under the action of the rotating magnetic field of the stator winding 412, driving the motor shaft 421 to rotate synchronously, providing continuous power to the impeller.

[0058] The drive control board 43 is located at the axial end of the stator assembly 41 and is electrically connected to the stator winding 412. It controls the motor start-up, stop, speed adjustment, and commutation to ensure stable, efficient, and safe operation of the motor at high speeds.

[0059] In one embodiment, the outer wall of the stator frame 413 is fixedly fitted and connected to the inner wall of the inner cylinder 32.

[0060] The outer wall of the stator frame 413 is closely attached to the inner wall of the inner cylinder 32, achieving high coaxiality positioning between the stator and the rectifier guide assembly. This structurally avoids eccentricity, vibration, and displacement at high speeds, ensuring stable operation at ultra-high speeds.

[0061] The stator, inner cylinder, and impeller are concentric, eliminating the risk of eccentricity during high-speed rotation. This design features a large contact surface and tight contact, ensuring that the stator does not wobble or loosen under high torque, thus enhancing overall strength. It is suitable for high-speed and high-load operating conditions, and the fit and positioning do not require additional adjustments, improving assembly accuracy and efficiency.

[0062] like Figure 8 As shown, in one embodiment, the stator frame 413 has three arc-shaped bosses 4131 evenly arranged on the outer wall of the stator frame 413, and the arc-shaped bosses 4131 are adapted to the circumferential positioning grooves 321 of the inner cylinder 32.

[0063] The three arc-shaped bosses 4131 on the outer wall of the stator frame 413 are matched and engaged with the three positioning slots 321 on the inner wall of the inner cylinder 32, so as to achieve complete circumferential positioning of the motor stator, prevent rotation and deviation, and ensure that the stator does not slip or wobble under high speed and high torque conditions.

[0064] The arc-shaped boss 4131 and the positioning slot 321 cooperate to form a circumferential limiting structure, which can effectively prevent the stator from rotating relative to the inner cylinder; the three points are evenly distributed so that the stator is subjected to symmetrical force, which improves the stability of high-speed operation; the arc structure facilitates assembly guidance, reduces installation difficulty and improves coaxiality.

[0065] like Figure 9 As shown, in one embodiment, a second rectangular slot 4211 is provided at one end of the motor shaft 421.

[0066] A second rectangular slot 4211 is opened at the end of the motor shaft 421 to cooperate with the first rectangular slot 112 of the hub 11 and the flat key 5 to form a key connection structure that prevents circumferential rotation, slippage and high torque transmission, so as to ensure no power loss and no loss of rotation at high speed.

[0067] The second rectangular slot 4211 serves as a circumferential locking mechanism, preventing the motor shaft 421 from rotating relative to the impeller, ensuring complete torque transmission, improving the reliability of high-speed transmission, and avoiding loosening, slippage, eccentricity, and vibration at high speeds.

[0068] In one embodiment, the permanent magnet rotor 422 is located inside the stator core 411, and the two are arranged coaxially with the outer circle forming a uniform air gap between the outer circle and the inner hole of the stator core.

[0069] The permanent magnet rotor 422 is placed inside the stator core 411 and kept coaxially arranged with a uniform air gap, so that the magnetic field is evenly distributed and the electromagnetic force is balanced, ensuring that the motor operates efficiently and stably without eccentricity or electromagnetic vibration at high speeds.

[0070] The permanent magnet rotor 422 is located inside the stator core 411 and adopts an inner rotor layout, which is suitable for miniaturized fan structures, reduces the radial size of the motor, and improves space utilization. The coaxial arrangement of the two ensures that the rotor and stator are concentric, avoiding eccentricity, shaking, and increased noise at high speeds, and ensuring smooth operation.

[0071] like Figure 10 As shown, in one embodiment, the high-speed mixed-flow impeller structure further includes a flat key 5, one side of which is embedded in the first rectangular slot 112 of the hub 11, and the other side is embedded in the second rectangular slot 4211 of the motor shaft 421.

[0072] The flat key 5 is simultaneously embedded in the first rectangular slot 112 of the hub 11 and the second rectangular slot 4211 of the motor shaft 421, forming a rigid circumferential lock. This ensures that the impeller and the motor shaft do not rotate relative to each other, do not lose rotation, and do not slip at high speeds, ensuring 100% power transmission. Simultaneously, it clamps the hub 11 and the motor shaft 421, completely preventing relative rotation. Torque transmission: The flat key 5 can handle high torque transmission, ensuring no power loss under high-speed conditions, improving connection rigidity, avoiding high-speed vibration, loosening, and eccentricity. Furthermore, its simple structure and precise positioning facilitate installation and ensure coaxiality.

[0073] like Figure 11 As shown, in one embodiment, the high-speed mixed-flow impeller structure further includes a fan housing 6, which is coaxially disposed outside the mixed-flow impeller 1 and includes an air inlet section 61, a mounting flange 62, and a receiving cavity 63, which is coaxially arranged with the mixed-flow impeller 1.

[0074] The fan casing 6 is coaxially mounted outside the mixed flow impeller 1 to form a closed aerodynamic working chamber, which is dustproof, impactproof, and prevents airflow leakage, while providing structural support for air intake, installation, and internal component housing.

[0075] The intake section 61 converges and regulates the external air intake, guiding the airflow smoothly into the front guide vane and the mixing impeller, reducing intake resistance, minimizing turbulence, and improving aerodynamic efficiency; the mounting flange 62 is used to fix the outer cylinder of the fan casing and the rectifier and guide assembly, ensuring overall coaxiality, preventing eccentricity and vibration at high speeds, and achieving reliable assembly; the receiving cavity 63 is arranged coaxially with the mixing impeller 1, providing a closed installation space for the mixing impeller and the front guide vane, constraining the airflow direction, and protecting the internal aerodynamic components.

[0076] In one embodiment, one end of the air intake section 61 is provided with an arc transition surface 611.

[0077] By setting an arc transition surface 611 in the air inlet section 61 of the fan casing 6, the sharp corners and right angles at the air inlet can be eliminated, allowing the airflow to enter the fan interior in a smoother state, avoiding airflow impact, flow separation and vortex phenomena, significantly reducing air intake resistance and aerodynamic losses, and ensuring efficient and stable operation of the fan; at the same time, it can reduce airflow turbulence, effectively reduce air intake noise under high speed conditions, improve the efficiency and work capacity of airflow entering the impeller, and reduce the impact of high-speed airflow on the front guide vanes and the mixed flow impeller, extending the service life of components.

[0078] In one embodiment, the mounting flange 62 is fixedly connected to one end of the outer cylinder 31.

[0079] By fixing the mounting flange 62 of the fan casing 6 to one end of the outer cylinder 31 of the rectifier and guide assembly 3, precise positioning and rigid fixation of the fan casing 6 with the internal pneumatic components and motor assembly 4 can be achieved, ensuring high coaxiality of the overall structure and avoiding eccentricity, loosening, and vibration at high speeds. This ensures that the fan casing 6, mixing impeller 1, guide assembly, and motor remain concentric throughout the entire process, eliminating high-speed eccentric vibration at its source. The flange connection structure has high strength and a large contact area, which can improve the overall structural robustness and adapt to ultra-high-speed operating conditions. At the same time, using the flange as an installation reference facilitates rapid assembly and alignment, improves production assembly accuracy, and can seal the airflow channel to prevent air leakage, providing reliable structural support for the entire machine.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-speed mixed-flow impeller structure, characterized in that, include: Mixed flow impeller (1), the mixed flow impeller (1) has a three-dimensional twisted mixed flow structure, the blade inlet installation angle is 30°-70°, and the outlet installation angle is 15°-35°; The front guide vane (2) is a wave-shaped spatial twisted vane structure, which is coaxially arranged upstream of the mixed flow impeller (1); The rectifier and guide assembly (3) is coaxially disposed downstream of the mixing impeller (1) and includes an outer cylinder (31), an inner cylinder (32) and a guide vane group (33). The guide vane group (33) is evenly distributed circumferentially between the outer cylinder (31) and the inner cylinder (32).

2. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, The mixed flow impeller (1) includes a hub (11) and multiple mixed flow blades (12), which are evenly distributed around the hub (11).

3. The high-speed mixed-flow impeller structure according to claim 2, characterized in that, The hub (11) has a shaft hole (111) at its center.

4. The high-speed mixed-flow impeller structure according to claim 2, characterized in that, The inner wall of the hub (11) is provided with a first rectangular slot (112).

5. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, The front guide vane (2) includes an annular base (21) and multiple guide vanes (22). The annular base (21) is coaxially fixed upstream of the mixed flow impeller (1), and the guide vanes (22) are evenly distributed around the annular base (21).

6. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, The inner cylinder (32) has a hollow structure with a cavity inside.

7. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, The inner wall of the inner cylinder (32) is evenly arranged with three positioning slots (321) in the circumferential direction.

8. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, It also includes a built-in high-speed brushless motor assembly (4), which is fixedly installed in the cavity of the inner cylinder (32) and includes a stator assembly (41), a rotor assembly (42) and a drive control board (43). The stator assembly (41) includes a stator core (411), a stator winding (412), and a stator frame (413). The stator core (411) is nested and fixed inside the stator frame (413), and the stator winding (412) is wound between the stator frame (413) and the stator core (411). The rotor assembly (42) includes a motor shaft (421) and a permanent magnet rotor (422). The permanent magnet rotor (422) is coaxially sleeved and fixed to the outer periphery of the motor shaft (421). The motor shaft (421) is coaxially connected to the mixed flow impeller (1). The drive control board (43) is located at the axial end of the stator assembly (41) and is electrically connected to the stator winding (412).

9. The high-speed mixed-flow impeller structure according to claim 8, characterized in that, The outer wall of the stator frame (413) is fixedly attached to the inner wall of the inner cylinder (32).

10. The high-speed mixed-flow impeller structure according to claim 8, characterized in that, The stator frame (413) has three arc-shaped bosses (4131) evenly arranged on the outer wall, and the arc-shaped bosses (4131) are adapted to the circumferential positioning slots (321) of the inner cylinder (32).

11. The high-speed mixed-flow impeller structure according to claim 8, characterized in that, A second rectangular slot (4211) is provided at one end of the motor shaft (421).

12. The high-speed mixed-flow impeller structure according to claim 8, characterized in that, The permanent magnet rotor (422) is located inside the stator core (411), and the two are arranged coaxially with the outer circle forming a uniform air gap between the outer circle and the inner hole of the stator core.

13. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, It also includes a flat key (5), one side of which is embedded in the first rectangular slot (112) of the hub (11), and the other side is embedded in the second rectangular slot (4211) of the motor shaft (421).

14. The high-speed mixed-flow impeller structure according to claim 1, characterized in that, It also includes a fan housing (6), which is coaxially mounted on the outside of the mixed flow impeller (1), and includes an air inlet section (61), a mounting flange (62) and a receiving cavity (63), which is coaxially arranged with the mixed flow impeller (1).

15. The high-speed mixed-flow impeller structure according to claim 14, characterized in that, One end of the air intake section (61) is provided with an arc transition surface (611).

16. The high-speed mixed-flow impeller structure according to claim 14, characterized in that, The mounting flange (62) is fixedly connected to one end of the outer cylinder (31).

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