Impeller structure for adjusting axial force and magnetic suspension mixing device

Abstract

The application discloses a kind of regulating axial force impeller structure and magnetic suspension mixing device, comprising: magnetic suspension rotor and multiple blades;Magnetic suspension rotor is equipped with rotor magnetic component;Multiple blades are arranged on magnetic suspension rotor and can rotate concentrically with magnetic suspension rotor, blade has opposite pressure surface and suction surface, at least one blade pressure surface is equipped with for adjusting axial force small wing;And / or, at least one blade suction surface is equipped with for adjusting axial force small wing.The application is by being arranged for adjusting axial force small wing on blade, small wing can generate an axial force opposite to the direction of axial force of impeller, to adjust the axial force of impeller, to avoid the axis direction of impeller from the influence of axial force to occur shift, in turn drive rotor to shift along the axis direction, damage rotor.The setting mode is simple, easy to process, and setting small wing on blade can increase the mechanical strength of blade, improve the service life of blade, reduce use cost.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation mixing technology, specifically an impeller structure for adjusting axial force and a magnetic levitation mixing device. Background Technology

[0002] In the fields of pharmaceutical engineering, bioengineering, and chemical engineering, there is a frequent need for applications involving the mixing of gas-liquid or liquid-solid fluids. The rotation of an impeller generates energy, which acts on the fluid, creating a flow state. Currently, the most common approach is to use mechanical bearings for mechanical transmission. A motor drives the mixing shaft, which in turn rotates the impeller fixed to the shaft to agitate the fluid. During mixing, the impeller exerts a downward stirring force on the fluid, while the fluid also exerts an impact force on the impeller, resulting in an axial force on the rotor along its axis. The mixing shaft then acts to regulate this axial force.

[0003] A known prior art agitator impeller device for dispersing gas into a slurry containing solids and fluids. This device includes a rotating shaft with an upper end connected to a rotating mechanism and a free lower end. The device also includes an impeller coaxially connected to the lower end of the rotating shaft relative to a central axis. The impeller has a horizontal circular hub disk, horizontally connected to the lower end of the rotating shaft. Multiple agitator blades are mounted radially at equal intervals on the circular hub disk. During agitation, the axial force of the impeller can be adjusted via the rotating shaft connected to the hub disk to ensure the impeller remains in a stable rotational state. However, mechanical bearings experience mechanical wear and component aging over time. Debris generated by mechanical wear mixes with the agitation medium, inevitably contaminating the agitation medium in ultra-pure fields such as semiconductors, pharmaceuticals, and biochemistry, potentially leading to the scrapping of entire batches of raw materials, causing significant losses and increasing production costs. Therefore, for fields with high agitation requirements, the ideal transmission method is a suspended agitator mechanism.

[0004] Currently, commonly used magnetic levitation technology refers to a technique that uses magnetic force to overcome gravity and levitate objects. It utilizes the principle of "like poles repel, unlike poles attract" between the excitation magnetic fields of the stator and rotor in its magnetic bearing system to levitate the rotor. Simultaneously, it generates a driving force to propel the rotor in this levitated state. This results in low mechanical wear, easy maintenance, repair, and replacement, making it suitable for harsh environments, extremely clean and pollution-free environments, and special applications, particularly showing promising prospects in ultra-pure drive fields such as semiconductors, pharmaceuticals, and biochemistry. However, in magnetic levitation stirring mechanisms, the rotor also experiences axial forces from the fluid during stirring. During operation, the stator can only actively adjust the rotor's radial position; the axial position can only be passively adjusted. Since the rotor is in a levitated state during rotation and lacks the support of a stirring shaft, the axial forces on the rotor cannot be adjusted by the stirring shaft. The presence of these axial forces negatively impacts the operational stability and service life of the stirring mechanism. If the axial force acting on the impeller is not eliminated or adjusted, the upward axial force will pull the rotor upwards along the axial direction, causing it to collide with the limiting device located above the rotor; the downward axial force will pull the rotor downwards along the axial direction, causing it to collide with the stirring chamber, resulting in damage to the magnetic levitation rotor and rendering it inoperable. Especially in fields such as semiconductors, pharmaceuticals, and biochemistry, where high fluid purity is required, debris generated by friction between the rotor and the limiting device or stirring chamber will also compromise fluid purity. Therefore, to address the problem of the inability to adjust the axial force of the impeller in a magnetic levitation stirring mechanism operating on the bearingless motor principle, this invention provides an impeller structure capable of adjusting the axial force of the blades, thus solving the problems existing in the prior art. Summary of the Invention

[0005] To overcome the deficiencies in the prior art, embodiments of the present invention provide an impeller structure for adjusting axial force and a magnetic levitation hybrid device, which are used to solve at least one of the above problems.

[0006] This application discloses an impeller structure and a magnetic levitation hybrid device for adjusting axial force. The invention utilizes small winglets on the blades to adjust the axial force. These winglets generate an axial force opposite to the impeller's axial force, thus preventing the impeller from shifting along its axis due to the axial force, which could damage the magnetic levitation rotor. This design is simple, easy to manufacture, and improves the reliability of the magnetic levitation rotor. Furthermore, the winglets on the blades increase their mechanical strength, extend their service life, and reduce operating costs.

[0007] The present invention provides an impeller structure for adjusting axial force, comprising:

[0008] An impeller, comprising a magnetically levitated rotor and multiple blades, wherein the magnetically levitated rotor contains a rotor magnetic component; the multiple blades are disposed on the magnetically levitated rotor and can rotate concentrically with the magnetically levitated rotor, and the blades have opposing pressure surfaces and attractive surfaces;

[0009] A winglet is provided on the pressure surface of at least one of the blades for adjusting the axial force; and / or, a winglet is provided on the suction surface of at least one of the blades for adjusting the axial force.

[0010] Furthermore, each of the blades is provided with the winglet, or the blades are provided with the winglet at intervals of at least one blade.

[0011] Furthermore, the winglets are sheet-like.

[0012] Furthermore, the magnetic levitation rotor has a first axis along the axial direction, the end of the winglet near the first axis is the first end, and the end away from the first axis is the second end. When the maximum axial force of the impeller is downward, the axial height between the winglet and the end face of the magnetic levitation rotor gradually decreases from the first end to the second end.

[0013] Furthermore, the magnetically levitated rotor has a first axis along the axial direction, the end of the winglet adjacent to the first axis is the first end, and the end away from the first axis is the second end. When the maximum axial force of the impeller is upward, the axial height between the winglet and the end face of the magnetically levitated rotor is equal or gradually increases from the first end to the second end.

[0014] Furthermore, the guide surface of the winglet forms an angle with the pressure surface or suction surface of the blade that is not 0° or 180°.

[0015] Furthermore, the guide surface of the winglet is a planar or arc-shaped surface.

[0016] Furthermore, the outer edge of the winglet is arc-shaped.

[0017] Furthermore, the magnetically levitated rotor has a first axis along the axial direction, the radial distance from the first end of the winglet to the first axis is L1, the radial distance from the second end of the winglet to the first axis is L2, the radial distance from the outer edge of the blade to the first axis is L3, and the radial distance from the outer edge of the magnetically levitated rotor to the first axis is L4, wherein L1 > L4, L2 ≤ L3, and L3 > L4.

[0018] Furthermore, the blade is provided with a small wing, which is disposed on the pressure surface of the blade, or the small wing is disposed on the suction surface of the blade.

[0019] Furthermore, the blade is provided with a plurality of small winglets, all of which are located on the pressure surface or suction surface of the blade, or the plurality of small winglets are respectively provided on the pressure surface and the suction surface.

[0020] Furthermore, the rotor magnetic component is made of permanent magnet material or magnetically conductive material.

[0021] Furthermore, the magnetic levitation rotor has a first axis along the axial direction, the end of the blade near the first axis is a first part, and the end away from the first axis is a second part. The maximum outer diameter of the first part is less than or equal to the maximum outer diameter of the magnetic levitation rotor. The bottom end face of the first part is fixedly connected to the end face of the magnetic levitation rotor, and there is a preset distance between the bottom end face of the first part and the bottom end face of the second part along the axial direction.

[0022] Furthermore, the blade is perpendicular to the end face of the magnetically levitated rotor along the axial direction.

[0023] Furthermore, the blade has a first end face and a second end face opposite each other in the axial direction. The first end face is located above the second end face, and the second end face is the bottom end face of the second part. From the first part to the second part, the axial height between the first end face and the second end face is equal, or the axial height between the first end face and the second end face gradually decreases.

[0024] Furthermore, the axial height between the first end face and the second end face gradually decreases, and from the first part to the second part, the axial height between the first end face and the end face of the magnetic levitation rotor gradually decreases, and / or, the axial height between the second end face and the end face of the magnetic levitation rotor gradually increases.

[0025] Furthermore, the magnetic levitation rotor and the blade are integrally formed by injection molding, and / or the blade and the winglet are integrally formed by injection molding.

[0026] The present invention also provides a magnetic levitation mixing device, including the above-mentioned impeller structure for adjusting axial force. The magnetic levitation mixing device further includes a cavity and a magnetic levitation stator, wherein the magnetic levitation rotor is disposed in the cavity and the magnetic levitation stator is disposed outside the cavity.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention utilizes small winglets on the blades to adjust the axial force. These winglets generate an axial force opposite to that of the impeller, thus regulating the impeller's axial force and preventing axial misalignment caused by the axial force. This prevents the magnetic levitation rotor from shifting along its axis and damaging it. This design is simple, easy to manufacture, and improves the reliability of the magnetic levitation rotor. Furthermore, the winglets increase the mechanical strength and lifespan of the blades, reducing operating costs.

[0029] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the first impeller structure for adjusting axial force in an embodiment of the present invention;

[0032] Figure 2 This is a front view of the first impeller structure for adjusting axial force in an embodiment of the present invention;

[0033] Figure 3 This is a top view of the first impeller structure for adjusting axial force in an embodiment of the present invention;

[0034] Figure 4 This is a top view of the second type of impeller structure for adjusting axial force in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the fluid flow direction and the tangential direction at the first end of the winglet in the impeller structure with the winglet tilting from top to bottom in an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the fluid flow direction and the tangential direction at the first end of the winglet in the impeller structure with the winglet tilting from bottom to top in an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the fluid flow direction and the tangential direction at the first end of the winglet in the impeller structure of the same height as the winglet in an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the third type of impeller structure for adjusting axial force in this embodiment of the invention;

[0039] Figure 9 This is a schematic diagram of the fourth type of impeller structure for adjusting axial force in this embodiment of the invention;

[0040] Figure 10 This is a schematic diagram of the fifth type of impeller structure for adjusting axial force in this embodiment of the invention;

[0041] Figure 11 This is a schematic diagram of the magnetic levitation hybrid device in an embodiment of the present invention.

[0042] The reference numerals in the above figures are as follows: 10, magnetic levitation rotor; 11, first axis; 12, end face of the magnetic levitation rotor;

[0043] 20. Blade; 21. Pressure surface; 22. Suction surface; 23. First part; 24. Second part; 25. First end face; 26. Second end face; 27. Second axis;

[0044] 30. Winglet; 31. First end; 32. Second end; 33. Guide surface;

[0045] 40. Fluid flow direction;

[0046] 50. Tangential direction at the first end of the winglet;

[0047] 60. Cavity;

[0048] 70. Impeller. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, 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.

[0050] In the description of this invention, it should be noted that the terms "upper," "lower," "front," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "comprising" and "equipped with," and any variations thereof, in the specification, claims, and the aforementioned drawings of this invention are intended to cover non-exclusive inclusion. For example, a system, product, or device that includes a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] To enable those skilled in the art to better understand the present invention, the following description is provided in conjunction with the appendix. Figure 1-10 The present invention will be further described in detail below with reference to specific embodiments.

[0054] The impeller structure for adjusting axial force described in this application includes:

[0055] Impeller 70 includes a magnetically levitated rotor 10 and a plurality of blades 20. The magnetically levitated rotor 10 is provided with a rotor magnetic component. The plurality of blades 20 are disposed on the magnetically levitated rotor 10 and can rotate concentrically with the magnetically levitated rotor 10. The blades 20 have opposing pressure surfaces 21 and attraction surfaces 22.

[0056] A winglet 30 for adjusting axial force is provided on the pressure surface 21 of at least one of the blades 20, and / or a winglet 30 for adjusting axial force is provided on the suction surface 22 of at least one of the blades 20.

[0057] Specifically, such as Figure 1In this embodiment, the impeller structure for adjusting axial force includes an impeller 70 and small blades. The impeller 70 includes a magnetically levitated rotor 10 and multiple blades 20. The magnetically levitated rotor 10 contains a rotor magnetic component. The multiple blades 20 are disposed on the magnetically levitated rotor 10. Further, the multiple blades 20 can be disposed on the end face of the magnetically levitated rotor 10 or on its outer edge. The multiple blades 20 can rotate concentrically with the magnetically levitated rotor 10 under its drive. The multiple blades 20 can have the same shape and size, or they can be different. The number of blades 20 can be 4, 5, or 6, but is not limited to this. The following embodiments of this application all use an impeller structure with 6 blades 20. The specific placement position of each blade 20 on the magnetically levitated rotor 10 can be set as needed; they can be evenly spaced or unequally spaced. For example, each blade 20 can be evenly distributed along the end face of the magnetically levitated rotor 10 with the central axis of the rotor as its rotation center, thereby improving the uniformity of fluid flow in the impeller 70. The blade 20 has a pressure surface 21 and a suction surface 22. The pressure surface 21 refers to the curved surface of the impeller 70 that applies pressure to the fluid. The suction surface 22 refers to the curved surface of the fluid that impacts the blade 20 due to a decrease in pressure. The pressure surface 21 and the suction surface 22 are related to the rotation direction of the impeller 70, such as... Figure 1 , Figure 4 The direction indicated by the middle arrow is the rotation direction of the impeller 70. At least one of the blades 20 has a small wing 30 on its pressure surface 21 for adjusting the axial force. And / or, at least one of the blades 20 has a small wing 30 on its suction surface 22 for adjusting the axial force. Those skilled in the art can determine whether the small wing 30 is located on the pressure surface 21 or the suction surface 22 according to actual needs, specifically based on the fluid flow rate and velocity. For example, when the flow rate and velocity of the fluid flowing through the pressure surface 21 are greater than those on the suction surface 22, the small wing 30 located on the pressure surface 21 is most effective in adjusting the axial force of the fluid on the blade 20. This invention, by providing a small wing 30 on the blade 20 for adjusting the axial force, generates an axial force opposite to the direction of the axial force of the impeller 70, thereby adjusting the axial force of the impeller 70 and preventing the impeller 70 from shifting axially due to the influence of the axial force, which could then cause the rotor to shift axially and damage the rotor. This setup is simple and easy to manufacture. Adding winglets to the blades can increase their mechanical strength, extend their service life, and reduce operating costs.

[0058] Specifically, in this embodiment, each blade 20 is provided with a winglet 30. Alternatively, the winglet 30 is provided on blades 20 that are spaced at least one blade apart. It should be noted that each interval can be between two blades, between three blades, or between two and three blades in sequence, but is not limited to these. It should be noted that the position of the winglets must ensure that the relative positions of the winglets on the impeller 70 are generally balanced. For example, the impeller 70 is provided with at least two winglets, which are arranged opposite each other along the diameter direction of the impeller 70, to avoid an imbalance in the overall axial force of the impeller 70, where one side of the impeller 70 has winglets that can adjust the axial force while the other side cannot, thus preventing an imbalance in the axial force of the impeller 70. Furthermore, those skilled in the art can determine the spacing of the blades 20 according to actual needs to reduce the number of winglets 30 while still satisfying the requirement of adjusting the axial force, thereby reducing production costs.

[0059] Specifically, in combination Figures 1-10 In this embodiment, the winglet 30 is sheet-shaped. The sheet-shaped winglet not only facilitates demolding during injection molding, but also provides better adjustment of the axial force of the blade compared to other shapes. Of course, the thickness, length, and curvature of the sheet-shaped winglet can be determined according to actual needs and are not limited here.

[0060] Furthermore, in the axial direction, the winglet 30 can be disposed at the upper, middle, or lower part of the blade 20, and the position of the winglet 30 relative to the blade 20 can be adjusted according to actual needs. In a preferred embodiment, the winglet 30 is disposed at the middle part of the blade 20, where the mechanical strength of the blade 20 is optimal, thereby improving the service life of the blade 20 and reducing operating costs.

[0061] Specifically, in this embodiment, the magnetically levitated rotor has a first axis along its axial direction, and the end of the winglet adjacent to the first axis is the first end, and the end away from the first axis is the second end. During the operation of the impeller 70, when the maximum axial force on the impeller 70 is downward, the winglet 30 must satisfy the following: from the first end 31 to the second end 32, the axial height between the winglet 30 and the end face of the magnetically levitated rotor 10 gradually decreases, so that the winglet 30 generates an upward axial force to adjust the downward axial force of the impeller 70. Furthermore, when the fluid enters the stirring chamber from top to bottom and flows through the blade 20, the tangent direction at a certain point on the guide surface of the winglet 30 forms an angle with the fluid flow direction 40. For example, the tangent direction at the first end of the winglet 30 forms an angle θ1 with the fluid flow direction 40, such as... Figure 5Angle θ1 will generate a radial force component to the right and an axial force component to the up. The upward axial force component is used to adjust the downward axial force on the impeller 70 at this time, so that the axial force on the impeller 70 tends to 0, so as to avoid axial movement when the magnetic levitation rotor rotates and always remain in a stable state.

[0062] In another embodiment, the magnetically levitated rotor has a first axis along its axial direction, and the end of the winglet adjacent to the first axis is the first end, and the end away from the first axis is the second end. During the operation of the impeller 70, when the maximum axial force on the impeller 70 is upward, the winglet 30 must satisfy the following: from the first end 31 to the second end 32, the axial height between the winglet 30 and the end face of the magnetically levitated rotor 10 is equal or gradually increases, so that the winglet 30 generates a downward axial force to adjust the upward axial force of the impeller 70. Furthermore, when the fluid enters the stirring chamber from top to bottom and flows through the blade 20, the tangent direction at a certain point on the guide surface of the winglet 30 makes an angle with the fluid flow direction 40. For example: Figure 6 The axial height of the winglet gradually increases from the first end 31 to the second end 32. The tangent direction of the first end of the winglet 30 forms an angle θ2 with the fluid flow direction 40. This angle θ2 generates a radial force component to the right and a downward axial force component. The downward axial force component is used to adjust the upward axial force on the impeller 70, thereby reducing the axial force on the impeller 70 to near zero, thus preventing axial movement of the magnetic levitation rotor and ensuring it remains in a stable state. Figure 7 The axial height of the winglet is equal from the first end 31 to the second end 32. The tangent direction of the first end of the winglet 30 forms an angle θ3 with the fluid flow direction 40. The angle θ3 generates a radial force component to the right and a downward axial force component. The downward axial force component is used to adjust the upward axial force on the impeller 70 at this time, so that the axial force on the impeller 70 tends to be 0, so as to avoid axial movement when the magnetic levitation rotor rotates and always remain in a stable state.

[0063] Specifically, in this embodiment, the guide surface of the winglet 30 forms an angle with the pressure surface or suction surface of the blade 20 that is not 0° or 180°. In one embodiment, the guide surface 33 of the winglet 30 is perpendicular to the pressure surface 21 or suction surface 22 of the blade 20. That is, viewed from the end of the blade 20 toward the first axis 11 of the magnetic levitation rotor 10, the end face of the second end 32 of the winglet 30 is perpendicular to the pressure surface 21 or suction surface 22 of the blade 20. Fluid flows from top to bottom through the winglet 30, from the first end 31 to the second end 32 of the winglet 30, and then flows out from the second end 32 of the winglet 30 in a direction perpendicular to the pressure surface 21 or suction surface 22 of the blade 20, generating an axial force opposite to the maximum axial force on the impeller 70, thereby adjusting the axial force of the impeller 70.

[0064] In another embodiment, the guide surface 33 of the winglet 30 forms a certain angle α with the pressure surface 21 or suction surface 22 of the blade 20, wherein the angle α ranges from 0° < α < 90° or 90° < α < 180°. This embodiment includes two tilted states of the winglet 30. When the guide surface 33 of the winglet 30 forms an angle between 0° and 90° with the pressure surface 21 or suction surface 22 of the blade 20, the end face of the second end 32 of the winglet 30 tilts downwards when viewed from the end of the blade 20 towards the first axis 11 of the magnetic levitation rotor 10. Fluid flows downward through the winglet 30, from its first end 31 to its second end 32, and then flows out from the second end 32 of the winglet 30 at an angle between 0° and 90° to the pressure surface 21 or suction surface 22 of the blade 20, generating an axial force opposite to the maximum axial force on the impeller 70, thereby adjusting the axial force of the impeller 70. When the guide surface 33 of the winglet 30 forms an angle between 90° and 180° with the pressure surface 21 or suction surface 22 of the blade 20, the end face of the second end 32 of the winglet 30 tilts upward from the bottom when viewed from the end of the blade 20 toward the first axis 11 of the magnetic levitation rotor 10. Fluid flows downwards through the winglet 30, from its first end 31 to its second end 32, and then exits from the second end 32 at an angle of 90°-180° to the pressure surface 21 or suction surface 22 of the blade 20, generating an axial force opposite to the maximum axial force on the impeller 70, thereby adjusting the axial force of the impeller 70. Further, in this embodiment, a 90° angle between the guide surface 33 of the winglet 30 and the pressure surface 21 or suction surface 22 of the blade 20 is preferred. Of course, those skilled in the art can determine the angle between the guide surface 33 of the winglet 30 and the pressure surface 21 or suction surface 22 of the blade 20 according to actual needs to achieve better adjustment of the maximum axial force of the impeller 70.

[0065] Specifically, in this embodiment, the guide surface 33 of the winglet 30 is either a plane or an arc-shaped surface. A plane means that the junction between the winglet 30 and the blade 20 is a straight line. An arc-shaped surface means that the junction between the winglet 30 and the blade 20 is an arc-shaped line. In this application, the guide surface 33 of the winglet 30 is preferably an arc-shaped surface so that it matches the flow direction of the fluid.

[0066] Specifically, such as Figure 4 In this embodiment, the outer edge of the winglet 30 is arc-shaped. The arc-shaped outer edge can reduce the shear force on the blade, but it is not limited to this. Those skilled in the art can determine the shape of the winglet 30 according to actual needs. It should be noted that the outer edge of the winglet in this embodiment is not suitable to be zigzag-shaped. If there is an inflection point on the outer edge of the winglet, the fluid velocity changes greatly when flowing through the winglet, resulting in a large velocity gradient and thus a large shear force on the blade, affecting the stirring effect of the blade on the fluid. Furthermore, the outer edge of the winglet 30 has a preset distance relative to the blade 20 in the circumferential direction, denoted by W. Figure 4 This refers to the maximum circumferential distance between the outer edge of the winglet 30 and the blade 20. The higher the fluid rotation speed, the greater the axial force on the impeller 70. Therefore, when the impeller 70 structure is used in a device where the fluid rotation speed is high, the width of the winglet needs to be set wider. Figure 3 and Figure 4 That is, the distance between the outer edge of the winglet 30 and the blade 20 in the circumferential direction is set to be larger, so that the winglet can better adjust the axial force.

[0067] Specifically, such as Figure 3In this embodiment, the magnetically levitated rotor 10 has a first axis 11 along its axial direction. The end of the winglet 30 adjacent to the first axis 11 is the first end 31, and the end away from the first axis 11 is the second end 32. The radial distance from the first end 31 of the winglet 30 to the first axis 11 is L1. The radial distance from the second end 32 of the winglet 30 to the first axis 11 is L2. The radial distance from the outer edge of the blade 20 to the first axis 11 is L3. The radial distance from the outer edge of the magnetically levitated rotor 10 to the first axis 11 is L4. The relationships between L1, L2, L3, and L4 must be: L1 > L4, L2 ≤ L3. Further, the relationship between the radial distance from the first end 31 of the winglet 30 to the first axis 11 and the radial distance from the outer edge of the magnetically levitated rotor 10 to the first axis 11 is limited by the manufacturing process; satisfying L1 > L4 is a preferred embodiment, but not limited to this. Of course, with improvements in manufacturing processes, the radial distance from the first end 31 of the winglet 30 to the first axis 11 can also be equal to or less than the radial distance from the outer edge of the magnetic levitation rotor 10 to the first axis 11. That is, the first end 31 of the winglet 30 can be set from the position of the blade 20 near the first axis 11. Those skilled in the art can determine the starting point and ending point of the winglet 30 according to the manufacturing process and actual needs so that the winglet 30 can achieve the best effect in adjusting the axial force.

[0068] Furthermore, in this embodiment, the blades are open blades 20, satisfying the condition that the radial distance from the outer edge of the blade 20 to the first axis 11 is greater than the radial distance from the outer edge of the magnetic levitation rotor 10 to the first axis 11, i.e., the relationship between L3 and L4 must be: L3 > L4. Open blades are easier to manufacture and process, and easier to clean. When the stirring device needs to transport liquids with high viscosity and slurry-like liquids, open blades have a larger head than closed blades and semi-open blades, making them more suitable for use in stirring devices.

[0069] Specifically, such as Figure 4In this embodiment, a small wing 30 is provided on the blade 20. The small wing 30 is disposed on the pressure surface 21 of the blade 20. Alternatively, the small wing 30 is disposed on the suction surface 22 of the blade 20. When the blade 20 is a straight blade, the flow rate and velocity of the fluid flowing through the pressure surface 21 and suction surface 22 of the blade 20 are basically the same. Those skilled in the art can determine the placement position of the small wing 30 according to actual needs. When the blade 20 bends towards the suction surface 22, the impeller 70 rotates clockwise. At this time, the flow rate and velocity of the fluid flowing through the suction surface 22 are greater than those on the pressure surface 21, and the effect of the small wing 30 in adjusting the axial force on the suction surface 22 is better. Of course, those skilled in the art can determine the placement position of the small wing 30 according to actual needs to ensure the best effect of the small wing 30 in adjusting the axial force.

[0070] Specifically, in this embodiment, the blade 20 is provided with a plurality of winglets 30. All of the winglets 30 are located on the pressure surface 21 or the suction surface 22 of the blade 20. Alternatively, the winglets 30 are respectively located on the pressure surface 21 and the suction surface 22. The arrangement of the winglets 30 on the blade 20 is set according to the needs of those skilled in the art to maximize the effect of the winglets 30 in adjusting the axial force. Further, when the winglets 30 are respectively located on the pressure surface 21 and the suction surface 22, the winglets 30 on the pressure surface 21 and the winglets 30 on the suction surface 22 may be asymmetrical. Alternatively, the winglets 30 on the pressure surface 21 and the winglets 30 on the suction surface 22 may be axially symmetrical or rotationally symmetrical. Those skilled in the art can determine the relative positions of the winglets 30 according to actual needs to maximize the effect of the winglets 30 in adjusting the axial force.

[0071] Specifically, in this embodiment, the rotor magnetic component is a permanent magnet material or a magnetically conductive material. The permanent magnet material can be an AlNiCo permanent magnet alloy, an IronChromiumCo permanent magnet alloy, permanent magnet ferrite, or rare earth permanent magnet material, but is not limited to these. The magnetically conductive material can be alloy steel, silicon steel sheet, stainless steel, or electrical pure iron, but is not limited to these.

[0072] Specifically, such as Figure 2In this embodiment, the magnetically levitated rotor has a first axis along its axial direction. With the second axis 29 as the dividing point, the end of the blade 20 closest to the first axis 11 is designated as a first portion 23, and the end furthest from the first axis 11 is designated as a second portion 24. The maximum outer diameter of the first portion 23 is less than or equal to the maximum outer diameter of the magnetically levitated rotor 10. The bottom end face of the first portion 23 is fixedly connected to the end face of the magnetically levitated rotor 10. A preset distance exists between the bottom end face of the first portion 23 and the bottom end face of the second portion 24 along the axial direction. Those skilled in the art can set this preset distance according to actual needs to improve the stirring effect of the impeller 70. Further, in one embodiment, the bottom end face of the first portion 23 is located below the bottom end face of the second portion 24, that is, the bottom end face of the second portion 24 is located above the magnetically levitated rotor 10, and there is a certain axial distance between them. In another embodiment, the bottom surface of the first portion 23 is located above the bottom surface of the second portion 24, that is, the bottom surface of the second portion 24 is located below the magnetic levitation rotor 10, and there is a certain axial distance between them. In this application, the shape of the blade 20 is preferably such that the bottom surface of the first portion 23 is located below the bottom surface of the second portion 24. Of course, those skilled in the art can determine the positional relationship between the first portion 23 and the second portion 24 of the blade 20 according to actual needs, so that the stirring effect of the impeller 70 can meet the requirements.

[0073] Specifically, in combination Figure 1 and Figure 8 In this embodiment, the blade is perpendicular to the end face of the magnetically levitated rotor along the axial direction, i.e., the blade is a vertical blade. It should be noted that the blade is a radial flow blade in the radial direction. Radial flow blades include straight blades in the radial direction, straight blades in the axial direction, forward-curved blades, and backward-curved blades, but are not limited to these. Straight blades include straight blades of equal height and straight blades of unequal height; unequal height straight blades are hereinafter referred to as oblique blades. Radial flow blades have advantages such as a wide operating speed range, a wide operating viscosity range, high shear force, high turbulent diffusion capability, and high circulation capability, making them suitable for a wide range of applications. The oblique blade can be inclined at its upper or lower end face, or at its pressure surface 21 or suction surface 22. Those skilled in the art can select the shape of the blade 20 according to actual needs. Figure 9The blades are curved blades, including forward-curved blades or backward-curved blades. Curved blades have advantages such as good fluid discharge performance and less blade wear. The circulation capacity of curved blades is slightly worse than that of straight blades, but the shear force is also smaller. The shape of the curved blade can be parabolic, logarithmic spiral, involute, or arc-shaped, but is not limited to these. Those skilled in the art can select the shape and curvature of the blade 20 according to actual needs, ensuring that the blade placement angle of the curved blade is equal to the fluid flow angle.

[0074] Specifically, in combination Figure 8 and Figure 10 In this embodiment, the blade 20 has a first end face 25 and a second end face 26 opposite each other in the axial direction. The first end face 25 is located above the second end face 26. The second end face 26 is the bottom end face of the second portion 24. From the first portion 23 to the second portion 24, the axial height between the first end face 25 and the second end face 26 is equal, that is, the blade 20 is a blade of equal height. It should be noted that in this embodiment, regardless of whether the blade 20 is a straight blade or a curved blade, the axial height between the first end face 25 and the second end face 26 can be equal. The shape of the blade 20 can have various combinations. For example, a preferred embodiment is that the blade 20 is curved towards the suction surface 22, and the axial height between the first end face 25 and the second end face 26 is equal, that is, the blade 20 is a curved blade of equal height. Those skilled in the art can choose the shape of the blade 20 according to actual needs.

[0075] In another implementation, combined with Figure 10 and Figure 11From the first portion 23 to the second portion 24, the axial height between the first end face 25 and the second end face 26 gradually decreases, meaning that the first end face 25 and the second end face 26 have a certain angle along the flow direction of the blade 20. Further, in this embodiment, three types of blade 20 deformations are included. The first deformation is: from the first portion 23 to the second portion 24, the axial height between the first end face 25 and the end face of the magnetic levitation rotor 10 gradually decreases, meaning that the first end face 25 of the blade 20 tilts downwards from the first portion 23 to the second portion 24, while the second end face 26 is horizontally positioned. This deformation is because the first portion 23 of the impeller 70 experiences greater force than the second portion 24 during operation. The tilted design of the first end face 25 ensures that the blade is wider at the first portion 23 and narrower at the second portion 24, thereby strengthening the first portion 23 of the blade 20 and preventing the blade 20 from breaking at the root of the first portion 23 during operation. The second variation is as follows: the first end face 25 of the blade 20 is horizontally positioned, and the axial height between the second end face 26 and the end face of the magnetic levitation rotor 10 gradually increases, that is, the second end face 26 tilts upward from the first part 23 to the second part 24. This variation can prevent the second part 24 of the blade 20 from colliding with the bottom of the stirrer due to vibration during operation of the magnetic levitation rotor 10. The third variation is as follows: the first end face 25 of the blade 20 tilts downward from the first part 23 to the second part 24, and the second end face 26 tilts upward from the first part 23 to the second part 24. This variation can strengthen the first part 23 of the blade 20, preventing the blade 20 from breaking at the root of the first part 23 during operation, and can also prevent the second part 24 of the blade 20 from colliding with the bottom of the stirrer due to vibration during operation of the magnetic levitation rotor 10, which is the preferred embodiment.

[0076] It should be noted that the shape of the blade 20 includes, but is not limited to, the deformations mentioned in the above embodiments. Other deformations based on the above embodiments are within the protection scope of this invention. For example, the blade 20 may be inclined upwards or downwards at both ends in the radial direction. Those skilled in the art can select the shape of the blade 20 according to actual needs to meet different requirements.

[0077] Specifically, in this embodiment, the magnetic levitation rotor 10 and the blade 20 are integrally formed by injection molding, and / or the blade 20 and the winglet 30 are integrally formed by injection molding. That is, the magnetic levitation rotor 10, the blade 20, and the winglet 30 are integrally formed. Alternatively, the blade 20 and the winglet 30 can be integrally formed first, and then the blade 20 can be welded to the magnetic levitation rotor 10. The integral forming method avoids the weld seam that exists when the blade 20 is welded to the magnetic levitation rotor 10, which would affect the stirring effect of the impeller 70 to some extent. Moreover, in fields such as pharmaceuticals where high fluid purity is required, the weld seam would contaminate the fluid after long-term use. However, this also presents the difficulty of demolding after injection molding. Therefore, the relative positions of the blade 20 and the magnetic levitation rotor 10, and the relative positions of the blade 20 and the winglet 30, need to be precisely positioned to reduce demolding difficulty, improve production yield, and reduce the cost increase caused by product damage due to demolding. It should be noted that the preferred embodiment is that the magnetic levitation rotor 10, the blade 20 and the winglet 30 are integrally formed. Those skilled in the art can choose the forming method of the three according to actual needs.

[0078] This invention also applies for a magnetic levitation hybrid device, including the aforementioned impeller 70 structure for adjusting axial force. The magnetic levitation hybrid device further includes a cavity and a magnetic levitation stator. The magnetic levitation rotor 10 is disposed within the cavity, and the magnetic levitation stator is disposed outside the cavity. When the magnetic levitation rotor 10 is an inner rotor, a downwardly protruding rotor cavity is provided at the bottom of the cavity to accommodate the magnetic levitation rotor 10. In this case, the magnetic levitation stator is sleeved on the outer edge of the magnetic levitation rotor 10. Energizing the stator generates current in its coils, thereby generating an electromagnetic field that drives the magnetic levitation rotor 10 to rotate. When the magnetic levitation rotor 10 is an outer rotor, an upwardly protruding stator cavity is provided at the bottom of the cavity to accommodate the magnetic levitation stator. In this case, the magnetic levitation rotor 10 is sleeved on the outer edge of the stator. Energizing the stator generates current in its coils, thereby generating an electromagnetic field that drives the magnetic levitation rotor 10 to rotate. Those skilled in the art can select the appropriate combination of the magnetic levitation stator and the magnetic levitation rotor 10 according to actual needs.

[0079] Furthermore, during operation, the magnetic levitation stator can actively adjust the radial position of the magnetic levitation rotor 10, but cannot actively adjust its axial position; the axial position can only be passively adjusted. Therefore, the axial force experienced by the magnetic levitation rotor during operation needs to be adjusted by small winglets mounted on the blades. When the impeller 70 is subjected to an upward axial force, the magnetic levitation rotor will move upward, colliding with the limiting device positioned above the impeller 70; when the impeller 70 is subjected to a downward axial force, the magnetic levitation rotor will move downward, colliding with the cavity, leading to damage to the magnetic levitation rotor. Furthermore, the debris generated by the collision and friction between the magnetic levitation rotor and the limiting device or cavity will affect the purity of the fluid. Therefore, this application improves the reliability and service life of the magnetic levitation rotor by providing a small wing on the blade for adjusting the axial force. When the magnetic levitation rotor moves upward along the axial direction, the small wing generates a downward axial force to pull the magnetic levitation rotor downward, thus preventing the magnetic levitation rotor from colliding with the limiting device; when the magnetic levitation rotor moves downward along the axial direction, the small wing generates an upward axial force to pull the magnetic levitation rotor upward, thus preventing the magnetic levitation rotor from colliding with the cavity.

[0080] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the technical solutions and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An impeller structure for adjusting axial force, characterized in that, include: An impeller, comprising a magnetically levitated rotor and multiple blades, wherein the magnetically levitated rotor is provided with a rotor magnetic component, and the multiple blades are disposed on the magnetically levitated rotor and can rotate concentrically with the magnetically levitated rotor, wherein the blades have opposing pressure surfaces and attractive surfaces; A winglet is provided on the pressure surface of at least one of the blades for adjusting the axial force; and / or, a winglet is provided on the suction surface of at least one of the blades for adjusting the axial force.

2. The impeller structure for adjusting axial force according to claim 1, characterized in that, Each of the blades is provided with the winglet; or, the blades are provided with the winglet at intervals of at least one blade.

3. The impeller structure for adjusting axial force according to claim 1, characterized in that, The winglets are sheet-like.

4. The impeller structure for adjusting axial force according to claim 3, characterized in that, The magnetically levitated rotor has a first axis along the axial direction. The end of the winglet adjacent to the first axis is the first end, and the end away from the first axis is the second end. When the maximum axial force of the impeller is downward, the axial height between the winglet and the end face of the magnetically levitated rotor gradually decreases from the first end to the second end.

5. The impeller structure for adjusting axial force according to claim 3, characterized in that, The magnetically levitated rotor has a first axis along the axial direction. The end of the winglet adjacent to the first axis is the first end, and the end away from the first axis is the second end. When the maximum axial force of the impeller is upward, the axial height between the winglet and the end face of the magnetically levitated rotor is equal or gradually increases from the first end to the second end.

6. The impeller structure for adjusting axial force according to claim 4 or 5, characterized in that, The guide surface of the winglet forms an angle with the pressure surface and suction surface of the blade that is not 0° or 180°.

7. The impeller structure for adjusting axial force according to claim 6, characterized in that, The guide surface of the winglet is either a plane or an arc-shaped surface.

8. The impeller structure for adjusting axial force according to claim 7, characterized in that, The outer edge of the winglet is arc-shaped.

9. The impeller structure for adjusting axial force according to claim 6, characterized in that, The radial distance from the first end of the winglet to the first axis is L1, the radial distance from the second end of the winglet to the first axis is L2, the radial distance from the outer edge of the blade to the first axis is L3, and the radial distance from the outer edge of the magnetic levitation rotor to the first axis is L4, wherein L1 > L4, L2 ≤ L3, and L3 > L4.

10. The impeller structure for adjusting axial force according to claim 9, characterized in that, The blade is provided with a small wing, which is disposed on the pressure surface of the blade, or the small wing is disposed on the suction surface of the blade.

11. The impeller structure for adjusting axial force according to claim 9, characterized in that, The blade is provided with a plurality of small winglets, all of which are located on the pressure surface or the suction surface of the blade, or the plurality of small winglets are respectively located on the pressure surface and the suction surface.

12. The impeller structure for adjusting axial force according to claim 1, characterized in that, The rotor magnetic components are made of permanent magnet material or magnetically conductive material.

13. The impeller structure for adjusting axial force according to claim 1, characterized in that, The magnetically levitated rotor has a first axis along the axial direction. The end of the blade adjacent to the first axis is a first part, and the end away from the first axis is a second part. The maximum outer diameter of the first part is less than or equal to the maximum outer diameter of the magnetically levitated rotor. The bottom end face of the first part is fixedly connected to the end face of the magnetically levitated rotor. There is a preset distance between the bottom end face of the first part and the bottom end face of the second part along the axial direction.

14. The impeller structure for adjusting axial force according to claim 13, characterized in that, The blades are perpendicular to the end face of the magnetically levitated rotor along the axial direction.

15. The impeller structure for adjusting axial force according to claim 13, characterized in that, The blade has a first end face and a second end face opposite each other in the axial direction. The first end face is located above the second end face, and the second end face is the bottom end face of the second part. From the first part to the second part, the axial height between the first end face and the second end face is equal, or the axial height between the first end face and the second end face gradually decreases.

16. The impeller structure for adjusting axial force according to claim 15, characterized in that, The axial height between the first end face and the second end face gradually decreases. From the first part to the second part, the axial height between the first end face and the end face of the magnetic levitation rotor gradually decreases, and / or the axial height between the second end face and the end face of the magnetic levitation rotor gradually increases.

17. The impeller structure for adjusting axial force according to claim 1, characterized in that, The magnetic levitation rotor and the blade are integrally formed by injection molding, and / or the blade and the winglet are integrally formed by injection molding.

18. A magnetic levitation hybrid device, characterized in that, The magnetic levitation mixing device includes the impeller structure for adjusting axial force as described in any one of claims 1-17, and further includes a cavity and a magnetic levitation stator, wherein the magnetic levitation rotor is disposed in the cavity and the magnetic levitation stator is disposed outside the cavity.

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