Magnetic suspension rotor impeller, pump head and magnetic suspension pump

Abstract

The invention discloses a magnetic suspension rotor impeller, a pump head and a magnetic suspension pump, the magnetic suspension rotor impeller comprises a rotor main body and a magnetic suspension rotor, the rotor main body is cylindrical, a first cavity is formed in the rotor main body, and the magnetic suspension rotor is sealed in the first cavity; the magnetic suspension rotor comprises a rotor magnet and a nano ceramic composite coating, and the nano ceramic composite coating comprises a metal coating in contact with the rotor magnet and a nano ceramic coating arranged outside the metal coating. By forming the nano ceramic composite coating on the surface of the rotor magnet, the problem that the plastic coating cannot play a role in protection due to damage to the plastic coating in the assembly process is solved, so that the service life of the magnetic suspension rotor impeller can be prolonged, metal coating ions are prevented from being separated out to pollute a pumping medium, and the cleanliness of the pumping medium is ensured.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation technology, specifically a magnetic levitation rotor impeller, a pump head, and a magnetic levitation pump. Background Technology

[0002] A magnetic levitation motor is a type of rotary actuator that uses magnetic force to levitate the rotor, so that there is no mechanical contact between the rotor and the stator. Magnetic levitation motors can be magnetic bearing motors, bearingless motors, or bearingless sheet motors, etc.

[0003] A magnetic bearing motor, also known as a magnetic bearing motor, is a motor that combines, rather than integrates, a rotary drive motor with an axial magnetic bearing or / and a radial magnetic bearing or / and a hybrid magnetic bearing.

[0004] A bearingless motor, also known as a self-bearing motor, integrates rotation and levitation functions. In a bearingless motor, an additional winding generates an excitation magnetic field on top of the existing rotational drive magnetic field. The interaction of these two magnetic fields disrupts the original balanced distribution of the drive magnetic field, generating a radial force on the rotor. Levitation of the rotor is achieved by controlling this radial force. Compared to magnetic bearing motors, the magnetic levitation winding in a bearingless motor is wound on the stator, not occupying additional radial space, thus overcoming the disadvantages of large size and high cost associated with magnetic bearings to some extent. Early bearingless motors typically required two bearingless motors and one axial magnetic bearing to achieve rotor levitation in all five degrees of freedom.

[0005] The self-bearing thin-plate motor is a special type of self-bearing motor that inherits the advantages of other self-bearing motors. Its rotor has a very small axial length-to-diameter ratio, is thin-plate-shaped, and eliminates the need for axial magnetic bearings. It utilizes self-bearing technology to achieve active rotation and radial levitation of the rotor, while a magnetic circuit constructed from a mechanical structure achieves passive levitation of the other three degrees of freedom besides radial and rotational degrees of freedom. It features high cleanliness, no precipitation, no particles, no dynamic seals, and superior performance, making it a promising candidate for ultra-clean drive applications in biochemistry, medicine, semiconductor manufacturing, and other fields.

[0006] Self-bearing thin-plate motors can be assembled with different functional accessories to become magnetic levitation devices for various applications. Magnetic levitation devices can be configured as magnetic levitation pumps. In magnetic levitation pump applications, the pump includes a self-bearing thin-plate motor and a pump head. The pump head includes a pump casing and a rotor impeller housed within the casing. The rotor magnet is both the rotor of the self-bearing thin-plate motor and part of the pump impeller; it can be, for example, a permanent magnet rotor, a short-circuit cage rotor, or a reluctance rotor. Therefore, the impeller is also called a magnetic levitation rotor impeller. The stator of the self-bearing thin-plate motor is configured to drive the magnetic levitation rotor impeller to rotate and levitate.

[0007] Currently, magnetically levitated rotor impellers typically include a rotor body, a rotor magnet embedded within the rotor body, and multiple blades formed on one end face of the rotor body. A flow channel (fluid passage) is formed between adjacent blades. For enclosed rotors, the magnetically levitated rotor impeller also includes a gland located on the side of the blades facing away from the rotor body, with a central through-hole formed in the center of the gland. The rotor body, also known as the rotor sheath, can be made of, for example, fluorinated hydrocarbon plastic to resist corrosion by chemically corrosive substances. The rotor magnet, also known as the magnetic core, can consist of only one or more permanent magnets, or it can include one or more permanent magnets combined with soft magnetic components. Typically, the soft magnetic components are made of iron, nickel-iron, or silicon-iron. To prevent corrosion of the rotor magnet, it is usually covered with a protective coating; for example, to resist corrosion by acidic or chemically corrosive substances, the rotor magnet is completely covered with a metallic coating. To resist corrosion from small molecules such as hydrochloric acid (HCl), hydrofluoric acid (HF), or ozone (O3), the rotor magnet is also coated with a plastic coating made of a polymer (Pyrelin) belonging to the parylene family. This metal or plastic coating can be one or more layers. However, the plastic coating made of parylene-based polymers is typically soft and thin, usually ranging from a few micrometers to tens of micrometers. When assembling the annular permanent magnet with both metal and plastic coatings into the annular groove of the sheath, friction and collision with the sheath are inevitable during assembly (especially during manual assembly). This can damage the plastic coating, rendering it ineffective as a protective agent. Consequently, this reduces the lifespan of the magnetic levitation rotor. If not detected promptly, it can also lead to serious production problems such as ion release from the metal coating contaminating the pumping medium. Summary of the Invention

[0008] To overcome the deficiencies in the prior art, embodiments of the present invention provide a magnetic levitation rotor impeller, a pump head, and a magnetic levitation pump, which are used to solve at least one of the above problems.

[0009] According to one aspect of the present disclosure, a magnetically levitated rotor impeller is disclosed, including a rotor body and a magnetically levitated rotor. The rotor body is cylindrical, and a first cavity is formed inside the rotor body. The magnetically levitated rotor is sealed in the first cavity. The magnetically levitated rotor includes a rotor magnet and a nano-ceramic composite coating. The nano-ceramic composite coating includes a metal coating in contact with the rotor magnet and a nano-ceramic coating disposed outside the metal coating.

[0010] Optionally, the nano-ceramic composite coating further includes a pyrene coating, which is disposed between the metal coating and the nano-ceramic coating, or the pyrene coating is disposed between the nano-ceramic coating and the rotor body.

[0011] Optionally, the metal coating is an alloy, and the alloy is made of a nickel-based alloy, an aluminum-based alloy, or a titanium-based alloy.

[0012] Optionally, the metal coating is a single-layer metal, and the single-layer metal is made of one of nickel, copper, aluminum and chromium.

[0013] Optionally, the metal coating is a multilayer metal, wherein the multilayer metal consists of a first nickel layer, a copper layer, and a second nickel layer from the inside out.

[0014] Optionally, the thickness of the metal coating is 10 micrometers to 60 micrometers.

[0015] Optionally, the nano-ceramic coating is formed by spraying and curing an inorganic nano-coating, wherein the nano-ceramic powder in the inorganic nano-coating is one of silicon dioxide, aluminum oxide, and titanium dioxide; or the nano-ceramic powder in the inorganic nano-coating is silicon dioxide and aluminum oxide powder or titanium dioxide and aluminum oxide powder.

[0016] Optionally, the thickness of the nano-ceramic coating is from 10 micrometers to 100 micrometers.

[0017] Optionally, the phenelzine coating is a single-layer film or a multi-layer film, and the phenelzine in each layer is one of the N-type, C-type, D-type, and HT-type.

[0018] Optionally, the thickness of the pyrelin coating is 20 micrometers to 100 micrometers.

[0019] Optionally, one end of the rotor body is formed with a plurality of pump blades for pumping.

[0020] Optionally, one end of the rotor body is formed with a plurality of stirring blades for stirring.

[0021] According to another aspect of the present disclosure, a pump head is provided, the pump head including a pump housing and the magnetically levitated rotor impeller, the magnetically levitated rotor impeller being disposed within the pump housing.

[0022] According to another aspect of the present disclosure, a magnetic levitation pump is provided, the magnetic levitation pump including a magnetic levitation motor and a pump head, the pump head being fixedly connected to the magnetic levitation motor, an impeller cavity being formed inside the pump casing, and an inlet and an outlet communicating with the impeller cavity being formed on the pump casing.

[0023] The beneficial effects of this invention are as follows: This invention proposes a magnetic levitation rotor impeller. By forming a nano-ceramic composite coating on the surface of the rotor magnet, it solves the problem of the plastic coating being damaged during assembly, thus rendering it ineffective in providing protection. The nano-ceramic coating (such as alumina, zirconium oxide, etc.) on the outer side of this nano-ceramic composite coating has good corrosion resistance, resisting acids, alkalis, and other corrosive media. Furthermore, it has extremely high hardness, significantly improving the wear resistance of the magnetic levitation rotor. Even if friction and collision occur due to misoperation during assembly, the protective layer will not be damaged, extending the service life of the magnetic levitation rotor and preventing the precipitation of metal coating ions that contaminate the pumping medium, ensuring the cleanliness of the pumping medium. Moreover, the nano-ceramic coating also possesses certain thermal insulation properties, protecting the permanent magnet from the effects of temperature changes in the conveying medium to a certain extent. The metal coating on the inner side of the nano-ceramic composite coating can resist acidic or chemically corrosive substances and improve the bonding force between the nano-ceramic coating and the rotor magnet (e.g., the permanent magnet).

[0024] 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

[0025] 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.

[0026] Figure 1 This is a schematic diagram of a magnetically levitated rotor impeller used for pumping in one embodiment of the present invention; Figure 2 yes Figure 1 Enlarged structural diagram at point A; Figure 3 This is a schematic diagram of another embodiment of the magnetically levitated rotor impeller used for pumping in this invention. Figure 4 yes Figure 3 Enlarged structural diagram at point A; Figure 5 This is a perspective view of an embodiment of a magnetically levitated rotor impeller used for pumping in this invention. Figure 6 This is a perspective view of an embodiment of a magnetically levitated rotor impeller used for stirring in this invention. Figure 7 This is a top view of one embodiment of the magnetically levitated rotor impeller used for stirring in this invention. Figure 8 yes Figure 8 Cross-sectional view along the BB direction; Figure 9 This is a top view of one embodiment of the pump head in this invention; Figure 10 yes Figure 9 Cross-sectional view along the AA direction; Figure 11 This is a schematic diagram of the magnetic levitation pump in an embodiment of the present invention. Detailed Implementation

[0027] 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.

[0028] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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.

[0029] 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.

[0030] The accompanying drawings in this disclosure are not drawn to scale, and the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this disclosure are only schematic diagrams.

[0031] See Figure 1 and Figure 2According to an embodiment of the present invention, a magnetically levitated rotor impeller is proposed, comprising a rotor body 1 and a magnetically levitated rotor 2. The rotor body 1 is cylindrical, and a first cavity 11 is formed inside the rotor body 1. The magnetically levitated rotor 2 is sealed within the first cavity 11. The magnetically levitated rotor 2 includes a rotor magnet 21 and a nano-ceramic composite coating 22. The nano-ceramic composite coating 22 includes a metal coating 221 in contact with the rotor magnet 21 and a nano-ceramic coating 222 disposed outside the metal coating 221. In this way, by forming a nano-ceramic composite coating on the surface of the rotor magnet, the problem of the plastic coating being damaged during the assembly process and thus failing to provide protection is solved. Compared with the prior art design that uses, for example, a paraffin coating as the outermost layer of the rotor magnet, the nano-ceramic coating (such as alumina, zirconium oxide, etc.) disposed on the outside of this nano-ceramic composite coating has better corrosion resistance and can resist acids, alkalis, and other corrosive media. On the other hand, it possesses extremely high hardness, which significantly improves the wear resistance of the magnetic levitation rotor. Even if friction and collision occur due to misoperation during assembly, the protective layer will not be damaged, thus extending the service life of the magnetic levitation rotor and preventing the precipitation of metal coating ions that contaminate the pumping medium, ensuring the cleanliness of the pumping medium. Moreover, the nano-ceramic coating also has certain thermal insulation properties, which can protect the permanent magnet from the effects of temperature changes in the conveying medium to a certain extent. The metal coating set on the inner side of the nano-ceramic composite coating can, on the one hand, resist acidic or chemically corrosive substances, and on the other hand, improve the bonding force between the nano-ceramic coating and the rotor magnet (such as the permanent magnet).

[0032] According to embodiments of this disclosure, see Figure 3 and Figure 4 The nano-ceramic composite coating 2 also includes a pyrene coating 223, which is disposed between the metal coating 221 and the nano-ceramic coating 222. This pyrene coating further improves acid corrosion resistance, especially against small-molecule gaseous acids, such as HF gas. In this embodiment, the nano-ceramic coating 222 surrounds the pyrene coating, protecting it and thus extending the service life of the magnetic levitation rotor. In other embodiments, the pyrene coating 223 can also be disposed between the nano-ceramic coating 222 and the rotor body 1. In this case, while the nano-ceramic coating 222 cannot protect the pyrene coating, it does improve the mechanical strength of the entire magnetic levitation rotor impeller.

[0033] The metal coating is used to resist corrosion by acidic or chemically corrosive substances. This invention does not limit the number of metal coating layers or the material of each layer. In one embodiment, the metal coating is an alloy, such as a nickel-based alloy, an aluminum-based alloy, or a titanium-based alloy. For example, nickel-based alloys not only resist corrosion by acidic or chemically corrosive substances, but also have high hardness and good toughness, effectively protecting the rotor magnet from physical damage. Similarly, titanium-based alloys not only resist corrosion by acidic or chemically corrosive substances, but also have high strength and are lightweight, helping to maintain the stability and reliability of the overall structure. Aluminum-based alloys are also lightweight, and have a significant price advantage, making them a more economical choice. In another embodiment, the metal coating can also be a single-layer metal, such as one of nickel, copper, aluminum, and chromium. In other embodiments, the metal coating can also be a multi-layer metal, preferably consisting of a first nickel layer, a copper layer, and a second nickel layer from the inside out.

[0034] According to embodiments of this disclosure, the thickness of the metal coating is from 10 micrometers to 60 micrometers. Preferably, the thickness of the metal coating is from 25 to 40 micrometers. When the metal coating is a multilayer metal, the thickness of the metal coating is the total thickness of the multilayer metal. The thickness of the metal coating typically depends on the specific application requirements and the materials used. To ensure optimal performance and meet specific application requirements, the thickness of the metal coating must be repeatedly tested and verified based on the material of the metal coating.

[0035] According to embodiments of this disclosure, the nano-ceramic coating is formed by spraying and curing an inorganic nano-coating. The nano-ceramic powder in the inorganic nano-coating is one of silicon dioxide, aluminum oxide, and titanium dioxide; or the nano-ceramic powder in the inorganic nano-coating is silicon dioxide and aluminum oxide powder or titanium dioxide and aluminum oxide powder. Preferably, the inorganic nano-coating is sprayed using plasma spraying or cold spraying technology to reduce the impact of high-temperature spraying on the magnetic properties of the permanent magnet. Preferably, a nickel-aluminum alloy layer can be first prepared on the surface of the rotor magnet substrate. The nickel-aluminum alloy layer has high bonding force with the rotor magnet and a rough surface, making it easy to bond with the nano-ceramic coating. The inorganic nano-ceramic coating has a smooth and uniform surface, and the coating is tightly bonded to the nickel-aluminum alloy, exhibiting high temperature resistance, high hardness, and high corrosion resistance.

[0036] According to embodiments of this disclosure, the thickness of the nano-ceramic coating is 10 to 100 micrometers. Preferably, the thickness of the nano-ceramic coating is 30 to 60 micrometers. Similarly, the thickness of the nano-ceramic coating typically depends on the specific application requirements and the materials used. To ensure optimal performance and meet specific application needs, the thickness of the nano-ceramic coating must be repeatedly tested and verified based on the material of the nano-ceramic coating.

[0037] Parylene coatings are used to improve acid corrosion resistance. Parylene coatings can be single-layer or multi-layer films; preferably, they are multi-layer films, with each layer containing one of the following Parylene types: N-type, C-type, D-type, or HT-type. Parylene is a high-performance polymer coating material, and each type has its unique properties and applicable scenarios. The selection of a suitable Parylene type is based on specific application requirements, such as operating temperature, chemical environment, and dimensional accuracy requirements. Preferably, HT-type Parylene is used, as it can operate stably under extreme high-temperature conditions exceeding 350°C, thereby reducing the damage to the Parylene coating caused by temperature during the hot-melt welding of the rotor body.

[0038] According to embodiments of this disclosure, the thickness of the pyrene coating is 10 to 100 micrometers. Preferably, the thickness of the pyrene coating is 40 to 60 micrometers. Similarly, the thickness of the pyrene coating typically depends on specific application requirements and the materials used. To ensure optimal performance and meet specific application needs, the thickness of the pyrene coating requires repeated testing and validation.

[0039] Depending on the configuration of the blades, the rotor body can be used for pumping or mixing. See also Figure 1 , Figure 3 and Figure 5 According to an embodiment of this disclosure, a magnetically levitated rotor impeller is used for pumping. One end of the rotor body has multiple pump blades 12 for pumping, arranged in an array around the rotation axis of the rotor body 1, with the inner edges of the multiple pump blades 12 forming a central cavity. A pressure cap 15 is provided at the end of the multiple pump blades 12 facing away from the rotor body 1, and a central through hole 14 communicating with the central cavity is formed in the center of the pressure cap. In this embodiment, the magnetically levitated rotor impeller is a closed impeller. In other embodiments, the end of the multiple pump blades facing away from the rotor body may not have a pressure cap, thus forming a semi-closed impeller.

[0040] According to embodiments of this disclosure, see Figure 1 The rotor body can also be injection molded with multiple interconnected central cavities and balance holes 13 at the end of the rotor body facing away from the pump blades, so as to release the high pressure liquid entering the bottom of the magnetic levitation rotor impeller and balance the axial force.

[0041] According to an embodiment of this disclosure, the rotor body includes a cup shell and a cover plate, which together form a first cavity, and the magnetically levitated rotor 2 is sealed within the first cavity 11. The cup shell and cover plate can be thermoplastics; for example, they can be made of fluorinated hydrocarbon plastics to resist the erosion of chemically corrosive substances. Preferably, the cup shell and cover plate can be made of perfluoroalkoxy polymer (PFA). In other embodiments, the cup shell and cover plate can also be made of ethylene trifluorochloroethylene (ECTFE) or polyvinylidene fluoride (PVDF). The cup shell, as a rotating component, is generally cylindrical, and the cover plate is generally disc-shaped, but not limited thereto; for example, the outer end face or side face of the cover plate can also have other auxiliary protrusions or recesses.

[0042] According to embodiments of this disclosure, the mating surfaces of the cover plate and the cup shell can be heated and melted before being extruded and welded together. That is, one side of the cover plate and the end face of the cup shell are first heated, and then the two parts are driven to move relative to each other so that the two end faces contact and are extruded, ultimately fusing the two parts together. Preferably, the heating method is non-contact heating, such as using an infrared heater for infrared welding. Infrared welding allows for precise control of the heating area, resulting in more uniform heating, avoiding localized overheating, and reducing mechanical damage to the material surface by eliminating the need for contact with the material. Infrared welding also ensures the cleanliness of the cup shell and cover plate, ensuring that no other impurities are introduced during the manufacturing process of the magnetic levitation rotor impeller. This allows the magnetic levitation rotor impeller to be used in high-cleanliness applications.

[0043] According to embodiments of this disclosure, pump blades are integrally injection molded onto the rotor body, which can ensure good product consistency while meeting the requirements of mass production. Multiple blade structures, also known as impellers, are integrally molded with the rotor body via injection molding, but are not limited to this. In other embodiments, multiple impellers can also be individually injection molded or machined. In other embodiments, welding can also be achieved through fasteners, adhesives, or other fixing methods.

[0044] The present invention does not limit the form of the blades in the above embodiments. A liquid flow channel is formed between adjacent pump blades. The form of the liquid flow channel is designed according to the fluid dynamics of the magnetic levitation pump. For example, it is designed to meet the centrifugal flow channel of the centrifugal pump. In this case, the blades generally thicken from the center inlet to the outer edge.

[0045] See Figure 6 , Figure 7 and Figure 8According to an embodiment of this disclosure, a magnetically levitated rotor impeller is used for stirring, and a plurality of stirring blades 12' are formed at one end of the rotor body for stirring. Similarly, the plurality of stirring blades 12' are arranged in an array around the rotation axis of the rotor body 1, and the inner edges of the plurality of stirring blades 12' form a central cavity. The plurality of stirring blades 12' can extend radially beyond the outer wall of the rotor body. A balancing hole 13 for balancing axial forces is formed at the center of the rotor body. Similarly, in this embodiment, the rotor body includes a cup shell and a cover plate, the cup shell and the cover plate forming a first cavity, and the magnetically levitated rotor 2 is sealed within the first cavity 11. The cup shell and the cover plate can be thermoplastic plastics; for example, they can be made of fluorinated hydrocarbon plastics to resist the erosion of chemically corrosive substances. Preferably, the cup shell and the cover plate can be made of perfluoroalkoxy polymers (PFA).

[0046] In the above embodiments, the rotor magnet, also referred to as the magnetic core, may consist of only one or more permanent magnets, or it may include one or more permanent magnets combined with soft magnetic components. Typically, the soft magnetic components are made of iron, nickel-iron, or silicon-iron. Preferably, according to embodiments of this disclosure, see [link to relevant documentation]. Figure 1 The rotor magnet 21 is configured as a ring-shaped permanent magnet. By setting a positioning pin and cooperating with the stator hole, the ring-shaped permanent magnet can be positioned and prevented from rotating relative to the first cavity.

[0047] Based on the same inventive concept, see [link to inventive concept] Figure 9 and Figure 10 The present invention also proposes a pump head, the pump head 100 including a pump casing 110 and a magnetically levitated rotor impeller 1 as described in the above embodiments, the magnetically levitated rotor impeller 1 being disposed within the pump casing 110. In one embodiment, a rotor cavity 150 and an impeller cavity 140 are formed within the pump casing, and an inlet 120 and an outlet 130 communicating with the impeller cavity are formed on the pump casing. The rotor cavity is disposed on one side of the impeller cavity, and the radial space of the rotor cavity is smaller than the radial space of the impeller cavity.

[0048] Based on the same inventive concept, see [link to inventive concept] Figure 10 and Figure 11 The present invention also proposes a magnetic levitation pump, which includes a magnetic levitation motor 200 and a pump head 100. The pump head 100 is fixedly connected to the magnetic levitation motor 200. An impeller cavity 140 is formed inside the pump casing 110, and an inlet 120 and an outlet 130 communicating with the impeller cavity 140 are formed on the pump casing. The present invention does not limit the type of magnetic levitation motor, and can be summarized as a magnetic levitation rotary actuator that uses magnetic field force to levitate the rotor, so that there is no mechanical contact between the rotor and the stator. Preferably, the magnetic levitation motor is a bearingless thin-plate motor.

[0049] Bearingless thin-plate motors are a special type of bearingless motor. They inherit the advantages of bearingless motors, and the rotor has a very small ratio of axial length to diameter, forming a thin plate shape. This eliminates the need for axial magnetic bearings. By utilizing bearingless technology, the rotor achieves active rotation and radial levitation. The magnetic circuit formed by the mechanical structure achieves passive levitation of the other three degrees of freedom besides radial and rotational degrees of freedom. It features high cleanliness, no precipitation, no particles, no dynamic seals, and superior performance, and has good application prospects in ultra-clean drive fields such as biochemistry, medicine, and semiconductor manufacturing.

[0050] Bearingless sheet motors can be classified into single-winding and double-winding structures based on their winding structures. This invention does not limit the winding structure of the bearingless sheet motor; it can be either a single-winding or double-winding structure. In one embodiment, each stator tooth of the magnetic levitation stator has one winding coil, which is a concentrated winding used for both rotation control and levitation control, thus forming a single-winding structure for the magnetic levitation motor. In another embodiment, each stator tooth of the magnetic levitation stator has two winding coils. Both winding coils can be concentrated windings, or one winding coil can be concentrated while the other is a distributed winding. The two winding coils on the stator tooth are overlapped, with one winding coil used for rotation control and the other for levitation control, thus forming a double-winding structure for the magnetic levitation motor. Because a single-winding magnetic levitation motor can simultaneously achieve rotor rotation and levitation using only one set of winding coils, it has better performance advantages compared to a double-winding magnetic levitation motor.

[0051] Based on the principle of bearingless sheet metal motors, the magnetic levitation pump of this invention can be configured as a magnetic levitation centrifugal pump, wherein the pump head and the magnetically levitation rotor impeller disposed therein can be easily separated from the housing of the magnetic levitation motor. This is another major advantage of the magnetic levitation centrifugal pump, because the pump housing and impeller can therefore be designed as, for example, single-use parts. Due to extremely high purity requirements, such single-use applications now often replace the complex cleaning and sterilization processes (e.g., by steam sterilization) of all those components that came into contact with the fluid to be treated in previous processes. In a single-use design, those components that came into contact with the fluid to be treated are used exactly once and then replaced by new (i.e., unused) single-use parts in the next application.

[0052] 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. A magnetically levitated rotor impeller, characterized in that, The rotor body includes a rotor body (1) and a magnetic levitation rotor (2). The rotor body is cylindrical and a first cavity (11) is formed inside the rotor body. The magnetic levitation rotor is sealed in the first cavity. The magnetic levitation rotor includes a rotor magnet (21) and a nano-ceramic composite coating (22). The nano-ceramic composite coating includes a metal coating (221) in contact with the rotor magnet and a nano-ceramic coating (222) disposed outside the metal coating.

2. The magnetically levitated rotor impeller according to claim 1, characterized in that, The nano-ceramic composite coating also includes a Pyrelin coating (223), which is disposed between the metal coating and the nano-ceramic coating, or the Pyrelin coating is disposed between the nano-ceramic coating and the rotor body.

3. The magnetically levitated rotor impeller according to claim 1, characterized in that, The metal coating is an alloy, and the alloy is made of nickel-based alloy, aluminum-based alloy, or titanium-based alloy.

4. The magnetically levitated rotor impeller according to claim 1, characterized in that, The metal coating is a single-layer metal, and the material of the single-layer metal is one of nickel, copper, aluminum and chromium.

5. The magnetically levitated rotor impeller according to claim 1, characterized in that, The metal coating is a multilayer metal, which consists of a first nickel layer, a copper layer, and a second nickel layer from the inside out.

6. The magnetically levitated rotor impeller according to claim 1, characterized in that, The thickness of the metal coating is 10 micrometers to 60 micrometers.

7. The magnetically levitated rotor impeller according to claim 1, characterized in that, The nano-ceramic coating is formed by spraying and curing an inorganic nano-coating. The nano-ceramic powder in the inorganic nano-coating is one of silicon dioxide, aluminum oxide, and titanium dioxide; or the nano-ceramic powder in the inorganic nano-coating is silicon dioxide and aluminum oxide powder or titanium dioxide and aluminum oxide powder.

8. The magnetically levitated rotor impeller according to claim 1, characterized in that, The thickness of the nano-ceramic coating is 10 micrometers to 100 micrometers.

9. The magnetically levitated rotor impeller according to claim 2, characterized in that, The pyrene coating is a single-layer or multi-layer film, and the pyrene in each layer is one of the N-type, C-type, D-type, or HT-type.

10. The magnetically levitated rotor impeller according to claim 2, characterized in that, The thickness of the Pirilin coating is 20 micrometers to 100 micrometers.

11. The magnetically levitated rotor impeller according to claim 1, characterized in that, The rotor body has multiple pump blades (12) formed at one end for pumping.

12. The magnetically levitated rotor impeller according to claim 1, characterized in that, The rotor body has multiple stirring blades (12') formed at one end for stirring.

13. A pump head, characterized in that, The pump head (100) includes a pump casing (110) and a magnetically levitated rotor impeller as described in any one of claims 1-11, wherein the magnetically levitated rotor impeller is disposed within the pump casing.

14. A magnetic levitation pump, characterized in that, The magnetic levitation pump includes a magnetic levitation motor (200) and a pump head as described in claim 13. The pump head is fixedly connected to the magnetic levitation motor. An impeller cavity (140) is formed inside the pump casing. An inlet (120) and an outlet (130) communicating with the impeller cavity are formed on the pump casing.

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