High-efficiency magnetic suspension pump

Abstract

The high-efficiency magnetic suspension pump comprises a pump head and a magnetic suspension motor, the magnetic suspension motor comprises a machine shell, a magnetic suspension rotor and a magnetic suspension stator, the pump head comprises a pump shell and a rotor impeller arranged in the pump shell, one end of the pump shell is provided with a rotor joint part, the machine shell is provided with a central concave cavity extending in the axial direction, and the pump shell is fixedly connected with the machine shell; the magnetic suspension stator comprises at least two stator assemblies, the at least two stator assemblies are arranged in the machine shell at intervals in the axial direction, and each stator assembly comprises a plurality of stator iron cores and electromagnetic coils wound around the stator iron cores. The plurality of stator cores are arranged around the magnetic suspension rotor or the magnetic suspension rotor is arranged around the plurality of stator cores, and the at least two stator assemblies are configured to drive the magnetic suspension rotor and the rotor impeller to rotate and perform magnetic suspension. The efficiency of the magnetic suspension pump can be improved, and the torque and power output of the magnetic suspension pump system can also be improved.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation technology, specifically a high-efficiency magnetic levitation pump. Background Technology

[0002] A magnetic levitation pump comprises a magnetic levitation motor and a pump head. The magnetic levitation motor includes a magnetic levitation stator and a magnetic levitation rotor. The pump head includes a pump casing and a rotor impeller housed within the casing. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and part of the pump's rotor impeller; it can be, for example, a permanent magnet rotor, a short-circuit cage rotor, or a reluctance rotor. The magnetic levitation stator is configured to drive the rotor impeller to rotate and levitate. The magnetic levitation motor is preferably a bearingless thin-plate motor. This type of motor inherits the advantages of bearingless motors, but with a very small ratio of axial length to diameter, forming a thin plate shape. This eliminates the need for axial magnetic bearings, achieving active rotation and radial levitation of the rotor using bearingless technology. A magnetic circuit constructed by 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, showing promising application prospects in ultra-pure drive fields such as biochemistry, medicine, and semiconductor manufacturing.

[0003] Although magnetic levitation bearingless pumps utilize bearingless technology to achieve active levitation of the rotor's rotation and radial direction, and passive levitation of the other three degrees of freedom (radial and rotational) using magnetic resistance, they possess characteristics such as high cleanliness, no precipitation, no particles, no dynamic seals, and a compact structure. However, because the axial and tilting levitation of magnetic levitation bearingless pumps is passive, the rotor stability is significantly affected by the fluid. This results in a typically large fluid clearance design between the rotor impeller and the volute, leading to lower efficiency. Furthermore, the rotor's axial length is much smaller than its radial length, resulting in a lower effective magnetic area, further limiting the efficiency of magnetic levitation bearingless pumps. Therefore, solving the problem of low efficiency in magnetic levitation bearingless pumps and developing a high-efficiency magnetic levitation pump has become an urgent technical issue to be addressed. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, embodiments of the present invention provide a high-efficiency magnetic levitation pump, which is used to solve at least one of the above problems.

[0005] According to one aspect of the present disclosure, a high-efficiency magnetic levitation pump is provided, including a pump head and a magnetic levitation motor. The magnetic levitation motor includes a housing, a magnetic levitation rotor, and a magnetic levitation stator. The pump head includes a pump casing with a pump cavity formed inside and a rotor impeller disposed within the pump casing. One end of the pump casing is provided with a rotor engagement portion. The housing has a central cavity extending axially. The pump casing is fixedly connected to the housing, and the rotor engagement portion is accommodated within the central cavity. The magnetic levitation stator includes at least two stator assemblies, which are axially spaced within the housing. Each stator assembly includes a plurality of stator cores and electromagnetic coils wound around the stator cores. The plurality of stator cores are arranged around the magnetic levitation rotor, or the magnetic levitation rotor is arranged around the plurality of stator cores. The at least two stator assemblies are configured to drive the magnetic levitation rotor and the rotor impeller to rotate and magnetically levitate.

[0006] Optionally, the pump casing further includes a pump head cover and a pump casing body. The rotor joint is located at one end of the pump casing body away from the pump head cover. The other end of the pump casing body is sealed and fixedly connected to the pump head cover. The rotor impeller is located in the pump cavity formed by the pump head cover, the pump casing body, and the rotor joint. The pump casing body is fixedly connected to the housing, and the rotor joint is accommodated in the central cavity.

[0007] Optionally, the pump casing further includes a pump head inlet and a pump head outlet. The pump head inlet is axially disposed at the center of the pump head cover and communicates with the pump cavity. The pump head outlet is disposed on the peripheral side of the pump casing body and communicates with the pump cavity.

[0008] Optionally, the pump head cover is integrally formed with the pump housing body, and the rotor joint is sealed and fixedly connected to the pump housing body.

[0009] Optionally, the rotor impeller includes a rotor body and an impeller disposed at one end of the rotor body, the magnetically levitated rotor is embedded in the rotor body, and the magnetically levitated rotor is configured as an integral long magnetic ring or at least two separate short magnetic rings; an annular groove is formed on the side of the pump head inlet facing the impeller, and a mouth ring that mates with the annular groove is formed on the end of the impeller facing the pump head inlet.

[0010] Optionally, the impeller includes multiple blades and a blade cover plate. The multiple blades are arranged in an array around the rotation axis of the rotor body, and the inner edges of the multiple blades form a central cavity. A blade flow channel connecting the central cavity is formed between two adjacent blades. The blade cover plate is disposed on the side of the blade facing away from the rotor body. The mouth ring is circular and is integrally formed with the blade cover plate.

[0011] Optionally, a balancing hole is formed at one end of the rotor body facing away from the impeller, and a separating element is provided in the central cavity to separate at least part of the secondary flow from the balancing hole and the main flow from the central cavity.

[0012] Optionally, the separating element is inverted in the shape of a bowl or a barrel at the end of the balancing hole facing the impeller, and a drainage hole is formed on the side wall of the separating element to connect the balancing hole and the impeller flow channel.

[0013] Optionally, the separating element is integrally formed with the rotor body, and the drainage hole is formed by drilling after the separating element and the rotor body are formed.

[0014] Optionally, two stator assemblies are provided. The high-efficiency magnetic levitation pump further includes a sensor device, which includes a first sensor assembly and a second sensor assembly. The first sensor assembly is located inside a plurality of electromagnetic coils of one stator assembly, and the second sensor assembly is located inside a plurality of electromagnetic coils of the other stator assembly.

[0015] Optionally, the first sensor assembly includes a first sensor bracket and a plurality of first position sensors disposed on the first sensor bracket, the plurality of first position sensors being evenly distributed circumferentially, and each first position sensor being located within the gap between two adjacent stator cores; the second sensor assembly includes a second sensor bracket and a plurality of second position sensors disposed on the second sensor bracket, the plurality of second position sensors being evenly distributed circumferentially, and each second position sensor being located within the gap between two adjacent stator cores.

[0016] Optionally, the first sensor bracket is a cylindrical shape with a polygonal cross-section, and a first slot is formed on the first sensor bracket to avoid the stator core of one of the stator assemblies. A first through groove is formed on the inner wall of the first sensor bracket, and a first boss for positioning the first position sensor is formed in the first through groove. The second sensor bracket is a cylindrical shape with a polygonal cross-section, and a second slot is formed on the second sensor bracket to avoid the stator core of another stator assembly. A second through groove is formed on the inner wall of the second sensor bracket, and a second boss for positioning the second position sensor is formed in the second through groove. Both the first position sensor and the second position sensor are eddy current position sensors.

[0017] Optionally, the sensor device further includes a third sensor assembly, which includes an interconnect circuit board and a plurality of Hall sensors disposed on the interconnect circuit board for detecting the rotational speed and angular position of the magnetic levitation rotor. The interconnect circuit board is fixedly connected to the first sensor bracket or the second sensor bracket.

[0018] Optionally, the housing includes an outer housing cylinder, an inner housing cylinder, a housing cover, and a housing base. One end of the inner housing cylinder is open and the opposite end is closed. The housing cover is connected between the open end of the inner housing cylinder and one end of the outer housing cylinder. The housing base is connected to the other end of the outer housing cylinder. The central cavity is formed by the inner housing cylinder. The magnetic levitation stator is disposed within the accommodating space enclosed by the housing cover, the outer housing cylinder, the inner housing cylinder, and the housing base.

[0019] Optionally, a plurality of first heat dissipation fins are formed on the outer wall of the outer casing, and a plurality of second heat dissipation fins are formed on the outer wall of the casing base; the casing cover, the casing inner cylinder, and the casing outer cylinder are integrally formed, or the casing cover and the casing inner cylinder are integrally formed.

[0020] Optionally, the magnetically levitated stator further includes a magnetic guide ring. The stator core is in the shape of a straight line, and the outer ends of multiple stator cores are connected to the magnetic guide rings. The magnetic guide rings of two adjacent stator assemblies are fixedly connected by concentric bodies, and the magnetic guide rings are thermally connected to the outer cylinder of the housing.

[0021] Optionally, it also includes a control circuit board and a heat sink. A receiving groove is formed in the housing base, and the control circuit board and the heat sink are disposed in the receiving groove. The heat sink conducts the heat generated by the heat-generating element on the control circuit board to the housing base.

[0022] Optionally, it also includes a control circuit board and a cooling plate, wherein a receiving groove is formed in the housing base, the control circuit board and the cooling plate are disposed in the receiving groove, and a cooling channel is formed in the cooling plate.

[0023] Optionally, it also includes a circulation pipe, one end of which is connected to the pump chamber through the pump head outlet, and the other end of which is connected to the pump chamber after passing through the cooling channel.

[0024] Optionally, it also includes a circulation pipe, one end of which is connected to the end of the pump chamber away from the pump head cover, and the other end of which is connected to the pump chamber through the pump head outlet.

[0025] The beneficial effects of this invention are as follows: This invention proposes a high-efficiency magnetic levitation pump. By arranging multiple stator assemblies along the axial direction, and having these stator assemblies independently and synchronously drive the same magnetic levitation rotor, the stability of the rotor impeller's axial and tilting degrees of freedom is greatly improved. This effectively reduces the fluid clearance design between the rotor impeller and the pump head chamber (pump head cover or housing body), thereby improving pump efficiency. Because multiple stator assemblies are spaced apart along the axial direction and drive the same magnetic levitation rotor, the effective magnetic area between the rotor and stator is greatly increased. With a similar motor size, this significantly improves the torque and power output of the magnetic levitation pump system. At the same power output, multiple stators share the total current, which improves electromagnetic conversion efficiency.

[0026] 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

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the high-efficiency magnetic levitation pump of the present invention. Figure 1 ; Figure 2 yes Figure 1 Cross-sectional view along the AA direction; Figure 3 This is a schematic diagram of the structure of an embodiment of the high-efficiency magnetic levitation pump of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of an embodiment of the high-efficiency magnetic levitation pump of the present invention. Figure 3 ; Figure 5 yes Figure 4 Cross-sectional view along the BB direction; Figure 6 This is a schematic diagram of the structure of an embodiment of the pump head in this invention. Figure 1 ; Figure 7 yes Figure 6 Cross-sectional view along the CC direction; Figure 8 This is a schematic diagram of the structure of one embodiment of the rotor impeller in this invention. Figure 1 ; Figure 9 This is a schematic diagram of the structure of one embodiment of the rotor impeller in this invention. Figure 2; Figure 10 yes Figure 9 Cross-sectional view along the DD direction; Figure 11 yes Figure 9 Cross-sectional view along the EE direction; Figure 12 This is a schematic diagram of another embodiment of the rotor impeller in this invention; Figure 13 yes Figure 12 Cross-sectional view along the FF direction; Figure 14 yes Figure 12 Cross-sectional view along the GG direction; Figure 15 This is a schematic diagram of another embodiment of the rotor impeller in this invention; Figure 16 This is a schematic diagram of another embodiment of the rotor impeller in this invention; Figure 17 This is a schematic diagram of the structure of an embodiment of the sensor device in this invention; Figure 18 This is a schematic diagram of the structure of an embodiment of the magnetic levitation motor in this invention; Figure 19 This is a schematic diagram of the structure of the magnetic levitation motor after removing the housing cover and the inner cylinder of the housing in this invention; Figure 20 This is a schematic diagram of the structure of an embodiment of the magnetically levitated stator in this invention; Figure 21 This is a schematic diagram of the structure of the magnetic levitation stator, magnetic levitation rotor, and sensor device in this invention. Figure 1 ; Figure 22 This is a schematic diagram of the structure of the magnetic levitation stator, magnetic levitation rotor, and sensor device in this invention. Figure 2 ; Figure 23 This is a schematic diagram of another embodiment of the high-efficiency magnetic levitation pump in this invention; Figure 24 This is a schematic diagram of another embodiment of the high-efficiency magnetic levitation pump in this invention; Figure 25 This is a schematic diagram of another embodiment of the high-efficiency magnetic levitation pump in this invention.

[0029] The reference numerals in the above figures are as follows: 1. Pump head; 10. Pump chamber; 11. Pump casing; 111. Rotor joint; 112. Pump head cover; 113. Pump casing body; 114. Pump head inlet; 115. Pump head outlet; 116. Annular groove; 12. Rotor impeller; 121. Rotor body; 122. Impeller; 1221. Blade; 1222. Blade cover plate; 1223. Central cavity; 1224. Blade channel; 123. Inlet ring; 124. Balance hole; 125. Separating element; 126. Drain hole; 127. Isolation component; 2. Magnetic levitation motor; 21. Housing; 211. Central cavity; 212. Outer cylinder of housing; 212. First heat dissipation fin; 213. Inner cylinder of housing; 214. Housing cover; 215. Housing base; 2151. Accommodating groove; 21 52. Second heat dissipation fins; 22. Magnetic levitation rotor; 221. First magnetic ring; 222. Second magnetic ring; 23. Magnetic levitation stator; 230. Stator assembly; 231. Stator core; 232. Electromagnetic coil; 233. Magnetic guide ring; 234. Concentric body; 3. Sensor device; 31. First sensor assembly; 311. First sensor bracket; 3111. First slot; 3112. First through slot; 3113. First boss; 312. First position sensor; 32. Second sensor assembly; 321. Second sensor bracket; 3211. Second slot; 3212. Second through slot; 3213. Second boss; 322. Second position sensor; 33. Third sensor assembly; 4. Control circuit board; 5. Heat sink; 6. Cooling plate; 7. Circulation pipe. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In existing technologies, magnetic levitation bearingless pumps utilize bearingless technology to achieve active levitation of the rotor's rotation and radial direction, and use magnetic resistance to achieve passive levitation of the other three degrees of freedom besides radial and rotational degrees of freedom. This results in high cleanliness, no precipitation, no particles, no dynamic seals, and a compact structure. However, because the axial and tilting levitation of magnetic levitation bearingless pumps is passive, the rotor stability is significantly affected by the fluid, leading to a typically large fluid clearance design between the rotor impeller and the volute, resulting in low efficiency. Furthermore, the rotor's axial length is much smaller than its radial length, resulting in a low effective magnetic area, further limiting the efficiency of the magnetic levitation bearingless pump. To address the low efficiency problem of magnetic levitation bearingless pumps, this invention proposes a high-efficiency magnetic levitation pump.

[0035] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5According to an embodiment of this disclosure, a high-efficiency magnetic levitation pump includes a pump head 1 and a magnetic levitation motor 2. The magnetic levitation motor 2 includes a housing 21, a magnetic levitation rotor 22, and a magnetic levitation stator 23. The pump head 1 includes a pump casing 11 with a pump cavity 10 inside and a rotor impeller 12 disposed in the pump casing 11. One end of the pump casing 11 is provided with a rotor engagement portion 111. The housing 21 has a central cavity 211 extending axially. The pump casing 11 is fixedly connected to the housing 21, and the rotor engagement portion 111 is accommodated in the central cavity 211. The magnetic levitation stator 23 includes at least two stator assemblies 230. The at least two stator assemblies 230 are axially spaced within the housing 21. Each stator assembly 230 includes a plurality of stator cores 231 and an electromagnetic coil 232 wound around the stator cores 231. The plurality of stator cores 231 are arranged around the magnetic levitation rotor 22. The at least two stator assemblies 230 are configured to drive the magnetic levitation rotor 22 and the rotor impeller 12 to rotate and magnetically levitate. By arranging multiple stator assemblies along the axial direction—for example, two stator assemblies—which independently and synchronously drive the same magnetically levitated rotor, the stability of the rotor impeller's axial and tilting degrees of freedom can be improved. This effectively reduces the fluid clearance design between the rotor impeller and the pump head chamber (pump head cover or housing), thus improving pump efficiency. Because multiple stator assemblies are spaced apart axially and drive the same magnetically levitated rotor, the effective magnetic area between the rotor and stator is greatly increased, significantly improving the torque and power output of the magnetically levitated pump system with a similar motor size. At the same power output, multiple stators share the total current, improving electromagnetic conversion efficiency.

[0036] The pump casing, being centrifugal, is one of the core stationary components of a centrifugal pump and a key component for achieving efficient energy conversion, stable fluid output, force balance, and structural support. (See also...) Figure 2 and Figure 7 According to an embodiment of this disclosure, the pump housing 11 includes a rotor engagement portion 111, a pump head cover 112, and a pump housing body 113. The rotor engagement portion 111 is located at one end of the pump housing body 113 away from the pump head cover 112. The other end of the pump housing body 113 is sealed and fixedly connected to the pump head cover 112. The rotor impeller 12 is located within the pump cavity 10 formed by the pump head cover 112, the pump housing body 113, and the rotor engagement portion 111. The pump housing body 113 is fixedly connected to the housing 21, and the rotor engagement portion 111 is accommodated within the central recess 211. The rotor engagement portion is used to achieve mating with the central recess of the magnetic levitation motor, and the rotor impeller with the magnetic levitation rotor is limited by the rotor engagement portion when located inside the pump head. Through the cooperation between the rotor engagement portion and the central recess of the magnetic levitation motor, an internal rotor type magnetic levitation motor configuration can be achieved. For example, see... Figure 2 and Figure 17In this case, the magnetic levitation motor has an inner rotor, meaning the rotor body 121 of the rotor impeller 12 is housed within the space of the rotor joint. The rotor joint of the pump head protrudes into the central cavity of the magnetic levitation motor, thus forming an inner rotor type magnetic levitation motor. However, this is not the only possibility. In other embodiments, the magnetic levitation motor can also be an outer rotor. In this case, the rotor joint is configured as a hollow convex column extending inward from the bottom wall of the pump head. The rotor body can be annular and fitted onto the convex column. The magnetic levitation stator of the magnetic levitation motor is disposed in the hollow portion of the convex column, thus forming an outer rotor type magnetic levitation motor. In the outer rotor type magnetic levitation motor embodiment, the magnetic levitation rotor is arranged around multiple stator cores.

[0037] According to embodiments of this disclosure, see Figure 1 and Figure 6 The pump casing 11 also includes a pump head inlet 114 and a pump head outlet 115. The pump head inlet 114 is axially positioned at the center of the pump head cover 112 and communicates with the pump chamber 10. The pump head outlet 115 is located on the circumferential side of the pump casing body 113 and communicates with the pump chamber 10. The pump head inlet being located at the center of the pump head cover and the pump head outlet being located on the circumferential side of the pump casing body constitutes a commonly used centrifugal pump structure. During operation, the pumping medium enters the pump chamber from the pump head inlet, is pressurized by the centrifugal action of the rotor impeller, and is then stably discharged from the pump head outlet. The pump casing is designed as two detachably connected parts: the pump head cover and the pump casing body, facilitating the placement of the rotor impeller with a magnetically levitated rotor into the pump chamber. Normally, the pump casing body and the pump head cover are sealed and fixedly connected. However, this is not a limitation; in another embodiment, the pump head cover and the pump casing body can also be integrally formed. In this case, the rotor joint is designed as an independent component, and is sealed and fixedly connected to the pump casing body by the rotor joint. In this pump head structure, the pump head inlet and outlet are located on a single component, namely an integral part consisting of the pump head cover and the pump housing body. The rotor joint may include a cylindrical portion (cup-shaped portion) and a flange portion extending outward from the cylindrical portion. The flange portion of the rotor joint is sealed and fixedly connected to the pump housing body. Compared to the embodiments described above, the sealing portion of this structure is further away from the pump cavity, especially the high-pressure area at the pump head outlet, thereby reducing the impact of the high-pressure medium on the sealing structure during high-pressure output of the magnetic levitation pump, thus improving sealing performance.

[0038] According to embodiments of this disclosure, see Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11The rotor impeller 12 includes a rotor body 121 and an impeller 122 located at one end of the rotor body 121. The magnetically levitated rotor 22 is embedded in the rotor body 121. An annular groove 116 is formed on the side of the pump head inlet 114 facing the impeller 122, and a retaining ring 123 that mates with the annular groove 116 is formed on the end of the impeller 122 facing the pump head inlet 114. Thus, by providing an annular groove and a retaining ring between the pump head inlet and the rotor impeller, the engagement between the annular groove and the retaining ring can reduce flow loss, improve the volumetric efficiency of the pump, and thus improve the overall efficiency of the pump. The end of the retaining ring facing the annular groove can extend into the annular groove, or it can be axially spaced a certain distance from the annular groove. Preferably, the end of the retaining ring facing the annular groove can extend into the annular groove. The retaining ring and the annular groove have a radial gap, which is not less than the suspension gap between the rotor body and the inner wall of the rotor joint, thereby ensuring that during the operation of the rotor impeller, when the rotor impeller is disturbed and deviates from the central axis, no physical contact occurs between the retaining ring and the annular groove. Especially in semiconductor manufacturing processes, preventing physical contact between moving and stationary parts is highly beneficial for maintaining the cleanliness of the pumped liquid medium. However, this is not the only advantage. In other applications, such as those where cleanliness requirements are less stringent, the radial clearance requirement between the nozzle ring and the annular groove can be relaxed. This will improve the overall efficiency of the pump. The rotor body, also known as the rotor sheath, supports the impeller and protects the magnetically levitated rotor. In semiconductor manufacturing applications, the rotor body can be made of materials such as fluorinated hydrocarbon plastics to resist chemical corrosion. The magnetically levitated rotor, also called the magnetic body or magnetic core, can consist of one or more permanent magnets. For example, it can be configured as a single long magnetic ring or at least two separate short magnetic rings. To prevent corrosion, the magnetically levitated rotor is typically coated with a protective coating; for example, it may be completely covered with a metal coating to resist acidic or chemical corrosion. To resist corrosion from small molecules such as hydrochloric acid (HCl), hydrofluoric acid (HF), or ozone (O3), the magnetically levitated rotor is also coated with a plastic coating made of a polymer belonging to the parylene family. This metal or plastic coating can be one or more layers.

[0039] According to an embodiment of this disclosure, see [link to embodiment of this disclosure]. Figure 16 At least two separate short magnetic rings include a first magnetic ring 221 and a second magnetic ring 222 spaced apart along the axial direction. The first magnetic ring 221 corresponds to one stator component 230 of the magnetic levitation stator 23, and the second magnetic ring 222 corresponds to the other stator component 230 of the magnetic levitation stator 23. An isolation component 127 is provided between the first magnetic ring 221 and the second magnetic ring 222. Both the first magnetic ring 221 and the second magnetic ring 222 include at least one pair of radially magnetized magnetic poles.

[0040] The rotor impeller can be semi-closed or closed. To improve the efficiency of the magnetic levitation pump, in this embodiment, the rotor impeller is a closed structure. According to an embodiment of this disclosure, see [link to relevant documentation]. Figure 8 , Figure 9 and Figure 10 The impeller includes multiple blades 1221 and a blade cover plate 1222. The multiple blades 1211 are arranged in an array around the rotation axis of the rotor body 121, and the inner edges of the multiple blades form a central cavity 1223. A blade flow channel 1224 connecting the central cavity is formed between two adjacent blades 1221. The blade cover plate 1222 is located on the side of the blades 1211 facing away from the rotor body 121. The mouth ring is circular, and the mouth ring 123 and the blade cover plate 1222 are integrally formed. Traditional split mouth rings are fixed to the impeller by interference fit, pins, or welding. Under high-speed rotation, thermal cycling, or vibration environments, there may be risks such as interference fit failure, weld cracking, and mouth ring detachment. It is also not conducive to conveying high-cleanliness liquid media. In this embodiment, the mouth ring and the blade cover plate are integrally formed, which can completely eliminate the risk of mouth ring loosening or detachment, reduce internal leakage, and improve efficiency.

[0041] According to embodiments of this disclosure, see Figure 7 and Figure 10 A balancing hole 124 is formed at one end of the rotor body 121 facing away from the impeller 122. A separating element 125 is provided within the central cavity of the impeller to at least partially separate the secondary flow from the balancing hole and the main flow from the central cavity. The separating element is used to at least partially separate the main flow entering the impeller central cavity through the pump head inlet and the secondary flow from the balancing hole. The form of the separating element is varied; see [reference needed]. Figure 7 In one embodiment, the separating element is a circular, sheet-like separating plate. The separating plate can be fixedly connected to the inner side of multiple blades 1211 by welding, so that the separating plate 5 is at a first distance from the rotor body. In other embodiments, the separating plate can be fixed to the end face of the rotor body by welding with protruding posts. Since the rotor body (shroud), blades, and separating plate are made of highly clean and corrosion-resistant materials, such as fluorinated hydrocarbon plastics, they resist the erosion of chemically corrosive substances. Hot-melt welding can firmly fix the separating plate to the inner side of the blades or the central post, solving the problem of the separating plate easily falling off. The separating plate can separate the mainstream flow at the impeller inlet from the secondary flow at the bottom of the rotor body, avoiding impact and collision between the mainstream and secondary flows and balancing the axial force.

[0042] According to embodiments of this disclosure, see Figure 12 , Figure 13 and Figure 14The separating element 125 is bowl-shaped or barrel-shaped and inverted at the end of the balancing hole 124 facing the impeller 122. A flow-guiding hole 126 is formed on the side wall of the separating element 125, connecting the balancing hole 124 and the impeller flow channel 1224. Through the balancing hole, the high-pressure secondary flow at the bottom of the impeller can be guided out to the impeller flow channel. This serves two purposes: firstly, it balances the axial force; secondly, it partially or completely prevents the secondary flow from colliding with the mainstream flow from the pump head inlet in the central cavity. This improves the turbulence of the fluid in the pump head's central cavity, reducing flow loss, increasing the pump's volumetric efficiency, and ultimately improving the overall pump efficiency. The number and shape of the balancing holes are not limited. In one embodiment, see [reference needed]. Figure 10 , Figure 11 The balance hole is a large central through-hole that runs through the rotor body. In another embodiment, see... Figure 15 The balancing hole includes multiple small through holes penetrating the rotor body, which are evenly arranged on a circle around the rotation axis of the rotor body. The central large through hole and the multiple small through holes have circular cross-sectional shapes along the perpendicular rotation axis. The shape of the drainage hole is not limited; for example, it can be a circular hole, an elliptical hole, or a square hole. Preferably, the drainage hole has an included angle with the impeller radial direction, see [reference needed]. Figure 14 The deflection angle of the flow-guiding hole is close to the spiral direction of the impeller channel. The separating element is cup-shaped or barrel-shaped and inverted on the rotor body for easy fixed connection with the rotor body. Preferably, the separating element 125 is integrally formed with the rotor body 121, and the flow-guiding hole 126 is formed by drilling after the separating element 125 and the rotor body 121 are formed. This method can replace hot melt welding and avoid rotor impeller damage caused by poor welding during hot melt welding. Forming the flow-guiding hole by drilling simplifies the molding mold and reduces the mold processing cost compared to integral injection molding of the flow-guiding hole. Moreover, compared with hot melt welding, forming the flow-guiding hole by drilling is less difficult to operate and easier to implement.

[0043] Sensors are crucial components in magnetic levitation motors. Typically, sensors include speed or position angle sensors to sense the rotational speed and angular position of the magnetic levitation rotor for speed feedback control and position loop control. These sensors can be Hall effect sensors or photoelectric sensors. The system also includes position sensors (displacement sensors) to sense the levitation position of the magnetic levitation rotor for radial and / or axial position control. Position sensors typically include x-axis and y-axis displacement sensors. These position sensors can be eddy current sensors, which have high sensitivity and are well-suited for sensing the rotor's levitation position. In other embodiments, sensors may also include temperature sensors or sensors for sensing other parameters.

[0044] According to embodiments of this disclosure, see Figure 2 , Figure 17 , Figure 19 , Figure 20 , Figure 21 and Figure 22 The magnetic levitation stator of this invention has two stator assemblies. The high-efficiency magnetic levitation pump also includes a sensor device 3, which comprises a first sensor assembly 31 and a second sensor assembly 32. The first sensor assembly 31 is located inside the plurality of electromagnetic coils 232 of one stator assembly 230, and the second sensor assembly 32 is located inside the plurality of electromagnetic coils 232 of the other stator assembly 230. Because the high-efficiency magnetic levitation pump of this invention includes two stator assemblies, this significantly increases the axial length of the magnetic levitation rotor. Compared to traditional magnetic levitation pumps that use only one set of sensors to detect the radial displacement of the rotor, this embodiment uses two sets of sensor assemblies. By measuring the difference in radial displacement between the front and rear ends, the tilt angle of the rotor is calculated in real time, thereby controlling the electromagnetic forces of the front and rear magnetic levitation stators separately. This achieves decoupled control of translation and yaw, and thus realizes high-precision, high-stability levitation control. Furthermore, integrating the sensors with the housing and magnetic levitation stator aligns with the trend of integration in modern high-performance magnetic levitation systems, reducing failure points such as connectors and cables, and improving system reliability.

[0045] According to embodiments of this disclosure, see Figure 17 , Figure 19 , Figure 21 and Figure 22 The first sensor assembly 31 includes a first sensor bracket 311 and a plurality of first position sensors 312 disposed on the first sensor bracket 311. The plurality of first position sensors 312 are evenly distributed circumferentially, and each first position sensor 312 is located in the gap between two adjacent stator cores. The second sensor assembly 32 includes a second sensor bracket 321 and a plurality of second position sensors 322 disposed on the second sensor bracket 321. The plurality of second position sensors 322 are evenly distributed circumferentially, and each second position sensor 322 is located in the gap between two adjacent stator cores. In this way, by evenly distributing multiple position sensors (first or second position sensors) circumferentially on the same sensor bracket, it is possible to ensure that multiple position sensors share a common reference, thereby improving measurement accuracy. During assembly, multiple position sensors can be fixed on the sensor bracket first, and then the sensor bracket can be assembled into the space of the magnetic levitation stator all at once. By setting the position sensors in the gap between two stator cores, the limited space within the magnetic levitation stator can be fully utilized, making the magnetic levitation motor structure more compact.

[0046] According to embodiments of this disclosure, see Figure 17 and Figure 21The first sensor bracket 311 is a cylindrical shape with a polygonal cross-section. A first slot 3111 is formed on the first sensor bracket 311 to avoid a stator core 231 of a stator assembly 230. A first through groove 3112 is formed on the inner wall of the first sensor bracket 3111. A first boss 3113 for positioning the first position sensor 312 is formed in the first through groove 3112. The second sensor bracket 321 is a cylindrical shape with a polygonal cross-section. A second slot 3211 is formed on the second sensor bracket 321 to avoid a stator core 231 of another stator assembly 230. A second through groove 3212 is formed on the inner wall of the second sensor bracket 3211. A second boss 3213 for positioning the second position sensor 322 is formed in the second through groove 3212. Both the first position sensor 312 and the second position sensor 322 are eddy current position sensors. By designing the cross-section of the sensor bracket as a polygon, the gap between two adjacent stator cores can be fully utilized, improving the structural strength of the sensor bracket and preventing deformation due to insufficient structural strength, which would affect the detection accuracy of the position sensor. In this embodiment, the magnetic levitation stator has six stator cores (stator teeth), therefore, the cross-sectional shape of the sensor bracket is a regular hexagon. The cross-sectional shape of the sensor bracket is adjusted according to the number of stator cores in the magnetic levitation stator. For example, when the magnetic levitation stator has eight stator cores, the cross-sectional shape of the sensor bracket is a regular octagon. By setting slots on the sensor bracket, the function of avoiding the stator cores of the magnetic levitation stator can be achieved. In this way, the sensor bracket and the magnetic levitation stator are combined, making the structure of the magnetic levitation motor more compact. By forming through slots on the inner wall of the sensor bracket and forming bosses in the through slots, the function of positioning the position sensor can be achieved. For example, the first position sensor 312 and the second position sensor 322 are both eddy current position sensors. The coil of the eddy current position sensor can be sleeved on the boss. Because the boss is located within the through slot, the coil of the eddy current position sensor will not protrude from the inner wall of the sensor bracket, allowing the position sensor to face the magnetically levitated rotor without increasing radial space. In this embodiment, the first and second sensor assemblies have substantially the same structure. In other embodiments, the structures of the first and second position sensor assemblies can be adjusted according to the position of the sensor bracket.

[0047] According to embodiments of this disclosure, see Figure 2The sensor device 3 further includes a third sensor assembly 33, which includes an interconnecting circuit board and multiple Hall sensors mounted on the interconnecting circuit board for detecting the rotational speed and angular position of the magnetically levitated rotor. The interconnecting circuit board is fixedly connected to either the first or second sensor bracket. Preferably, the interconnecting circuit board is fixedly connected to the second sensor bracket, meaning the third sensor assembly 33 is positioned on the side away from the pump head. Positioning the third sensor assembly 33 on the side away from the pump head facilitates electrical connection between the third sensor assembly 33 and the control circuit board integrated within the housing. Since the stator core of the magnetically levitated stator is arranged in a straight line in the radial plane of the vertical axis, positioning the third sensor assembly 33 on the side away from the pump head, rather than on the side closer to the pump head, also avoids interference with the electromagnetic coils of the magnetically levitated stator.

[0048] According to embodiments of this disclosure, see Figure 2 , Figure 3 , Figure 5 , Figure 18 and Figure 19 The housing 21 includes an outer housing cylinder 212, an inner housing cylinder 213, a housing cover 214, and a housing base 215. One end of the inner housing cylinder 213 is open, and the opposite end is closed. The housing cover 214 connects the open end of the inner housing cylinder 213 to one end of the outer housing cylinder 212. The housing base 215 connects to the other end of the outer housing cylinder 212. A central cavity 211 is formed by the inner housing cylinder. The magnetic levitation stator 23 is disposed within the accommodating space enclosed by the housing cover 214, the outer housing cylinder 212, the inner housing cylinder 213, and the housing base 215. The housing, as a structural support, provides space for the fixed installation of the magnetic levitation stator. Heat dissipation fins may or may not be provided on the outer walls of the outer housing cylinder and the housing base. In one embodiment, see [reference needed]. Figure 25Multiple first heat dissipation fins 2121 are formed on the outer wall of the outer casing, and multiple second heat dissipation fins 2152 are formed on the outer wall of the casing base. By forming multiple first heat dissipation fins on the outer wall of the outer casing, the heat dissipation area can be increased, thereby achieving effective heat dissipation for the stator part of the magnetic levitation motor. The first heat dissipation fins typically extend along the axial direction of the casing. By forming multiple second heat dissipation fins on the outer wall of the casing base, the heat dissipation area of ​​the casing base can be increased, thereby achieving effective heat dissipation for the control part of the magnetic levitation motor inside the casing base. The second heat dissipation fins can extend along the axial direction of the casing or radially. The inner casing 213 is open at one end and closed at the other end, and can be used as a central cavity to fit the rotor joint of the pump head, thereby forming an internal rotor magnetic levitation motor. The portion of the accommodating space enclosed by the casing cover 214, the outer casing 212, the inner casing 213, and the casing base 215, excluding the magnetic levitation stator and sensor device, can be filled with potting material. The potting material includes, but is not limited to, epoxy resin, silicone, polyurethane, etc. Filling the accommodating space with the potting material forms an integral motor structure. The potting material can encapsulate the magnetic levitation stator and sensor devices, enhancing the motor's overall integrity and improving its resistance to external impacts and vibrations. The housing material is not limited; it can be metallic, such as aluminum, or non-metallic, such as plastic materials suitable for one-piece injection molding. In one embodiment, the housing cover, inner housing cylinder, and outer housing cylinder are integrally formed. In this case, the housing cover, inner housing cylinder, and outer housing cylinder can be non-metallic materials. In another embodiment, the housing cover and inner housing cylinder are integrally formed. In this case, the housing cover and outer housing cylinder can be non-metallic materials, while the outer housing cylinder can be metallic to facilitate heat dissipation and not affect the sensor device's detection of the magnetic levitation rotor. A sealed connection can be made between the housing cover and the outer housing cylinder.

[0049] According to embodiments of this disclosure, see Figure 20 , Figure 21 and Figure 22The magnetic levitation stator 23 also includes a magnetic ring 233. The stator core 231 is in a straight line shape, and the outer ends of multiple stator cores 23 are connected to the magnetic rings 233. The magnetic rings 233 of two adjacent stator assemblies 230 are fixedly connected by concentric bodies 234. The magnetic rings 233 are thermally connected to the outer cylinder 212 of the housing. In this way, the magnetic rings of multiple stator assemblies are fixedly connected by concentric bodies, which can ensure the concentricity between the stator assemblies. The concentric bodies can be castings or welded parts. With the help of stator tooling, multiple stator assemblies can be assembled together and the concentricity can be guaranteed. The thermal connection between the magnetic rings 233 and the outer cylinder 212 of the housing facilitates the cooling and heat dissipation of the magnetic levitation stator. Depending on the winding structure, the magnetic levitation stator can be divided into a single winding structure and a double winding structure. This invention does not limit the winding structure of the magnetic levitation stator; it can be a single winding structure or a double winding structure. In one embodiment, each stator core of the magnetically levitated stator has one winding coil, which is a concentrated winding used for both rotation control and levitation control. In another embodiment, each stator core of the magnetically levitated stator has two winding coils. Both winding coils can be concentrated windings, or one winding coil can be concentrated and the other a distributed winding. The two winding coils on the stator core are wound together, with one winding coil used for rotation control and the other for levitation control.

[0050] According to embodiments of this disclosure, see Figure 2 The high-efficiency magnetic levitation pump also includes a control circuit board 4. A receiving groove 2151 is formed inside the housing base, and the control circuit board is located in the receiving groove. The controller and the housing of the magnetic levitation pump are integrated, which adapts to the development trend of integration of modern high-performance magnetic levitation systems, and achieves the purpose of reducing failure points such as connectors and cables, and improving system reliability.

[0051] According to embodiments of this disclosure, see Figure 23 The high-efficiency magnetic levitation pump also includes a control circuit board 4 and a heat sink 5. A receiving groove 2151 is formed within the housing base 215, and the control circuit board 4 and heat sink 5 are disposed within the receiving groove 2151. The heat sink 5 conducts the heat generated by the heating elements on the control circuit board 4 to the housing base. Since the control circuit board and the magnetic levitation stator of the magnetic levitation motor are integrated together, both are heat sources. By directly conducting the heat generated by the heating elements on the control circuit board 4 to the housing base through the heat sink, heat accumulation inside the housing can be avoided, thus improving the heat dissipation performance of the high-efficiency magnetic levitation pump.

[0052] According to embodiments of this disclosure, see Figure 24The high-efficiency magnetic levitation pump also includes a control circuit board 4 and a cooling plate 6. A receiving groove 2151 is formed within the housing base 215, and the control circuit board 4 and cooling plate 6 are disposed within the receiving groove 2151. Cooling channels are formed within the cooling plate 6. By installing a cooling plate within the housing base, the heat dissipation performance of the high-efficiency magnetic levitation pump can be further improved through the active cooling function of the cooling channels. The cooling plate can be externally connected to a circulating refrigerant. When the high-efficiency magnetic levitation pump is used to pump cooling media, it can also achieve its own active cooling through a circulation pipe. In one embodiment, see... Figure 24 The high-efficiency magnetic levitation pump also includes a circulation pipe 7. One end of the circulation pipe 7 is connected to the pump chamber 10 through the pump head outlet 115, and the other end of the circulation pipe 7 is connected to the pump chamber after passing through a cooling channel. In this way, by setting a circulation pipe between the pump head outlet and the pump chamber, a circulating flow can be formed using the pumped cooling medium. When the circulating flow passes through the cooling channel, it can cool and dissipate heat from the control circuit board.

[0053] According to embodiments of this disclosure, see Figure 23 In this embodiment, the circulation pipe 7 connects directly to the pump chamber without passing through the cooling plate. Specifically, one end of the circulation pipe 7 connects to the end of the pump chamber furthest from the pump head cover, and the other end connects to the pump chamber through the pump head outlet. By installing a circulation pipe between the pump head outlet and the pump chamber, a circulating flow can be formed using the pumping medium. This circulating flow promotes the return of fluid from the gap between the rotor and stator to the impeller, reducing flow loss and improving pump efficiency. Furthermore, the circulating flow can be introduced into the gap between the motor stator and rotor, effectively cooling both components. The circulating flow can also return to the impeller's impeller channels through the balance holes in the rotor body, balancing axial forces.

[0054] Although this invention is based on the principle of a bearingless thin-plate motor, it differs from traditional bearingless thin-plate motors in that the axial length of the magnetic levitation rotor is much greater than its radial length. Multiple independent stator assemblies synchronously drive the same magnetic levitation rotor, significantly improving the stability of the rotor impeller's axial and tilting degrees of freedom. This effectively reduces the fluid clearance design between the rotor impeller and the pump head chamber (pump head cover or housing body), improving pump efficiency. Furthermore, because multiple stator assemblies are axially spaced and drive the same magnetic levitation rotor, the effective magnetic area between the rotor and stator is greatly increased, significantly improving the torque and power output of the magnetic levitation pump system while maintaining a similar motor size. At the same power output, multiple stators share the total current, improving electromagnetic conversion efficiency.

[0055] 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 high-efficiency magnetic levitation pump, comprising a pump head (1) and a magnetic levitation motor (2), the magnetic levitation motor comprising a housing (21), a magnetic levitation rotor (22) and a magnetic levitation stator (23), the pump head comprising a pump casing (11) having a pump cavity (10) formed therein and a rotor impeller (12) disposed within the pump casing, one end of the pump casing having a rotor engagement portion (111), the housing having a central recess (211) extending axially, the pump casing being fixedly connected to the housing, and the rotor engagement portion being accommodated within the central recess, characterized in that: The magnetically levitated stator includes at least two stator assemblies (230), which are axially spaced within the housing. Each stator assembly includes a plurality of stator cores (231) and electromagnetic coils (232) wound around the stator cores. The plurality of stator cores are arranged around the magnetically levitated rotor, or the magnetically levitated rotor is arranged around the plurality of stator cores. The at least two stator assemblies are configured to drive the magnetically levitated rotor and the rotor impeller to rotate and magnetically levitate.

2. The high-efficiency magnetic levitation pump according to claim 1, characterized in that: The pump casing also includes a pump head cover (112) and a pump casing body (113). The rotor joint is located at one end of the pump casing body away from the pump head cover. The other end of the pump casing body is sealed and fixedly connected to the pump head cover. The rotor impeller is located in the pump cavity formed by the pump head cover, the pump casing body and the rotor joint. The pump casing body is fixedly connected to the housing and the rotor joint is accommodated in the central cavity.

3. The high-efficiency magnetic levitation pump according to claim 2, characterized in that: The pump casing also includes a pump head inlet (114) and a pump head outlet (115). The pump head inlet is axially disposed at the center of the pump head cover and communicates with the pump cavity. The pump head outlet is disposed on the peripheral side of the pump casing body and communicates with the pump cavity.

4. The high-efficiency magnetic levitation pump according to claim 2 or 3, characterized in that: The pump head cover is integrally formed with the pump housing body, and the rotor joint is sealed and fixedly connected to the pump housing body.

5. The high-efficiency magnetic levitation pump according to claim 3, characterized in that: The rotor impeller includes a rotor body (121) and an impeller (122) disposed at one end of the rotor body. The magnetically levitated rotor is embedded in the rotor body and is configured as an integral long magnetic ring or at least two separate short magnetic rings. An annular groove (116) is formed on the side of the pump head inlet facing the impeller, and a mouth ring (123) that cooperates with the annular groove is formed on the end of the impeller facing the pump head inlet.

6. The high-efficiency magnetic levitation pump according to claim 5, characterized in that: The impeller includes multiple blades (1221) and a blade cover plate (1222). The multiple blades are arranged in an array around the rotation axis of the rotor body, and the inner edges of the multiple blades form a central cavity (1223). A blade flow channel (1224) connecting the central cavity is formed between two adjacent blades. The blade cover plate is located on the side of the blade facing away from the rotor body, and the mouth ring is circular in shape and is integrally formed with the blade cover plate.

7. The high-efficiency magnetic levitation pump according to claim 6, characterized in that: A balance hole (124) is formed at one end of the rotor body facing away from the impeller, and a separation element (125) is provided in the central cavity to separate at least part of the secondary flow from the balance hole and the main flow from the central cavity.

8. The high-efficiency magnetic levitation pump according to claim 7, characterized in that: The separating element is inverted in the shape of a bowl or a barrel at the end of the balancing hole facing the impeller, and a flow-guiding hole (126) is formed on the side wall of the separating element to connect the balancing hole and the impeller flow channel.

9. The high-efficiency magnetic levitation pump according to claim 8, characterized in that: The separating element is integrally formed with the rotor body, and the drainage hole is formed by drilling after the separating element and the rotor body are formed.

10. The high-efficiency magnetic levitation pump according to claim 1, characterized in that: The high-efficiency magnetic levitation pump is provided with two stator assemblies and also includes a sensor device (3). The sensor device includes a first sensor assembly (31) and a second sensor assembly (32). The first sensor assembly is located inside the multiple electromagnetic coils of one stator assembly, and the second sensor assembly is located inside the multiple electromagnetic coils of the other stator assembly.

11. The high-efficiency magnetic levitation pump according to claim 10, characterized in that: The first sensor assembly includes a first sensor bracket (311) and a plurality of first position sensors (312) disposed on the first sensor bracket. The plurality of first position sensors are evenly distributed along the circumference, and each first position sensor is located in the gap between two adjacent stator cores. The second sensor assembly includes a second sensor bracket (321) and a plurality of second position sensors (322) disposed on the second sensor bracket. The plurality of second position sensors are evenly distributed along the circumference, and each second position sensor is located in the gap between two adjacent stator cores.

12. The high-efficiency magnetic levitation pump according to claim 11, characterized in that: The first sensor bracket is a cylindrical shape with a polygonal cross-section. A first slot (3111) is formed on the first sensor bracket to avoid the stator core of one of the stator assemblies. A first through slot (3112) is formed on the inner wall of the first sensor bracket. A first boss (3113) for positioning the first position sensor is formed in the first through slot. The second sensor bracket is a cylindrical shape with a polygonal cross-section. A second slot (3211) is formed on the second sensor bracket to avoid the stator core of another stator assembly. A second through slot (3212) is formed on the inner wall of the second sensor bracket. A second boss (3213) for positioning the second position sensor is formed in the second through slot. Both the first position sensor and the second position sensor are eddy current position sensors.

13. The high-efficiency magnetic levitation pump according to claim 11, characterized in that: The sensor device further includes a third sensor assembly (33), which includes an interconnect circuit board and a plurality of Hall sensors disposed on the interconnect circuit board for detecting the rotational speed and angular position of the magnetic levitation rotor. The interconnect circuit board is fixedly connected to the first sensor bracket or the second sensor bracket.

14. The high-efficiency magnetic levitation pump according to claim 1, characterized in that: The housing includes an outer housing cylinder (212), an inner housing cylinder (213), a housing cover (214), and a housing base (215). One end of the inner housing cylinder is open and the other end is closed. The housing cover is connected between the open end of the inner housing cylinder and one end of the outer housing cylinder. The housing base is connected to the other end of the outer housing cylinder. The central cavity is formed by the inner housing cylinder. The magnetic levitation stator is disposed in the accommodating space enclosed by the housing cover, the outer housing cylinder, the inner housing cylinder, and the housing base.

15. The high-efficiency magnetic levitation pump according to claim 14, characterized in that: Multiple first heat dissipation fins (2121) are formed on the outer wall of the outer casing cylinder, and multiple second heat dissipation fins (2152) are formed on the outer wall of the casing base; the casing cover, the casing inner cylinder and the casing outer cylinder are integrally formed, or the casing cover and the casing inner cylinder are integrally formed.

16. The high-efficiency magnetic levitation pump according to claim 14, characterized in that: The magnetic levitation stator also includes a magnetic ring (233). The stator core is in the shape of a straight line. The outer ends of multiple stator cores are connected to the magnetic ring. The magnetic rings of two adjacent stator assemblies are fixedly connected by a concentric body (234). The magnetic ring is thermally connected to the outer cylinder of the housing.

17. The high-efficiency magnetic levitation pump according to claim 14, characterized in that, It also includes a control circuit board (4) and a heat sink (5). A receiving groove (2151) is formed in the housing base. The control circuit board and the heat sink are disposed in the receiving groove. The heat sink conducts the heat generated by the heat-generating element on the control circuit board to the housing base.

18. The magnetically levitated liquid-cooled pump according to claim 14, characterized in that, It also includes a control circuit board (4) and a cooling plate (6). A receiving groove (2151) is formed in the housing base. The control circuit board and the cooling plate are disposed in the receiving groove. A cooling channel is formed in the cooling plate.

19. The magnetically levitated liquid-cooled pump according to claim 18, characterized in that, It also includes a circulation pipe (7), one end of which is connected to the pump chamber through the pump head outlet (115), and the other end of which is connected to the pump chamber through the cooling channel.

20. The high-efficiency magnetic levitation pump according to claim 3, characterized in that: It also includes a circulation pipe (7), one end of which is connected to the end of the pump chamber away from the pump head cover, and the other end of which is connected to the pump chamber through the pump head outlet.

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