magnetic levitation pump

Abstract

This application relates to a magnetic levitation pump, which includes a pump casing, an impeller, a drive motor, and an axial drive assembly. The pump casing has spaced-apart pressurization chambers and motor chambers. The impeller is rotatably suspended in the pressurization chamber. The drive motor includes a rotor and a stator. The rotor is fixedly connected to the impeller, and the stator is disposed in the motor chamber. The stator and rotor cooperate to generate a rotating magnetic field that can rotate the impeller. The axial drive assembly includes a first magnetic ring and a first coil. The first magnetic ring is fixedly connected to the impeller, and the first coil is disposed in the motor chamber. The first coil and the first magnetic ring cooperate to adjust the axial force that levitates the impeller. This application provides a hardware foundation for independent control of the impeller's rotational speed and levitation height by using the cooperation between the stator and the rotor, and the cooperation between the first coil and the first magnetic ring. This allows the control of the impeller's rotational speed and levitation height to be controlled by two separate systems, eliminating the need for complex decoupling and reducing the difficulty of impeller control.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a magnetic levitation pump. Background Technology

[0002] Magnetic levitation pumps, as an effective treatment for heart failure patients, are artificial mechanical devices that draw blood directly from the venous system or heart into the arterial system, partially or completely replacing the work of the ventricles. When a magnetic levitation pump is working, the impeller needs to be controlled to levitate within the pump's chamber. However, traditional magnetic levitation pumps are difficult to control and prone to control malfunctions. Summary of the Invention

[0003] Therefore, it is necessary to overcome the shortcomings of existing technologies and provide a magnetic levitation pump that can eliminate the need for complex decoupling and reduce the difficulty of impeller control.

[0004] This application provides a magnetic levitation pump, the magnetic levitation pump comprising:

[0005] The pump casing is provided with a spaced-out pressurization chamber and a motor chamber;

[0006] An impeller, which is rotatably suspended in the pressurization chamber;

[0007] A drive motor, comprising a rotor and a stator, wherein the rotor is fixedly connected to the impeller, and the stator is disposed in the motor chamber, the stator cooperating with the rotor to generate a rotating magnetic field capable of rotating the impeller; and

[0008] An axial drive assembly includes a first magnetic ring and a first coil. The first magnetic ring is fixedly connected to the impeller, and the first coil is disposed in the motor chamber. The first coil cooperates with the first magnetic ring to adjust the axial force that suspends the impeller.

[0009] In one embodiment, the first magnetic ring and the first coil are arranged coaxially along the axial direction of the impeller.

[0010] In one embodiment, the inner diameter of the first magnetic ring is equal to the inner diameter of the first coil, and the outer diameter of the first magnetic ring is equal to the outer diameter of the first coil.

[0011] In one embodiment, the stator includes a plurality of drive units, each of which cooperates with the rotor. The plurality of drive units are arranged around the first coil, and the rotor is arranged around the first magnetic ring.

[0012] In one embodiment, the magnetic levitation pump further includes a second magnetic ring and a third magnetic ring; wherein the second magnetic ring is disposed inside the impeller, and the third magnetic ring is disposed outside the pressurization chamber, the second magnetic ring and the third magnetic ring are magnetically coupled, and the force between the second magnetic ring and the third magnetic ring is in the same direction as the force between the first coil and the first magnetic ring.

[0013] In one embodiment, the second magnetic ring surrounds the first magnetic ring, and the second magnetic ring and the third magnetic ring are arranged opposite each other in the axial direction of the impeller.

[0014] In one embodiment, the pump housing further includes a partition that divides the inner cavity of the pump housing into the pressurization chamber and the motor chamber. The magnetic levitation pump further includes a fixing component disposed in the motor chamber, the fixing component abutting against the partition to press the third magnetic ring between the fixing component and the partition.

[0015] In one embodiment, the partition has a positioning groove on the side facing the fixing component, and the third magnetic ring is at least partially adapted to be received in the positioning groove; and / or, the fixing component is made of a non-ferromagnetic material.

[0016] In one embodiment, the stator includes a plurality of drive units, each drive unit including an iron core, a coil winding and a pole shoe, the coil winding being wound around the iron core, the pole shoe being connected to the side of the iron core near the partition, the plurality of pole shoes being arranged around the third magnetic ring, and the side of each pole shoe being opposite to and shape-fitting the outer peripheral surface of the third magnetic ring.

[0017] In one embodiment, the bottom wall of the pressurization chamber is provided with a flow-guiding cone that extends into the impeller; the magnetic levitation pump also includes a central magnet disposed within the flow-guiding cone; a first magnetic ring surrounds the outer periphery of the central magnet, the first magnetic ring and the central magnet have a height difference along the axial direction of the magnetic levitation pump, and the two at least partially overlap in the axial direction of the magnetic levitation pump.

[0018] In one embodiment, the distance between the lower surface of the central magnet and the bottom wall of the pressurization chamber is greater than the distance between the lower surface of the first magnetic ring and the bottom wall of the pressurization chamber, and the magnetic poles of the central magnet and the upper surface of the first magnetic ring are the same.

[0019] In one embodiment, the distance between the lower surface of the central magnet and the bottom wall of the pressurization chamber is less than the distance between the lower surface of the first magnetic ring and the bottom wall of the pressurization chamber, and the magnetic poles of the central magnet and the upper surface of the first magnetic ring are opposite.

[0020] The aforementioned magnetic levitation pump generates a rotating magnetic field that enables the impeller to rotate through the cooperation of the stator and rotor. Furthermore, the axial force levited by the first coil and the first magnetic ring is adjusted, thereby regulating and controlling the impeller's levitation height. Compared to related technologies where both impeller speed and levitation height are controlled by parameters of the drive motor stator, this provides the hardware foundation for independent control of impeller rotation and levitation height. This allows the impeller rotation and levitation height to be controlled by two separate systems, eliminating the need for complex decoupling and reducing the difficulty of impeller control. Additionally, the first coil in this application is located within the motor chamber. Compared to designs where the first coil and stator are located on opposite sides of the impeller, this avoids the need for additional space on the side of the impeller furthest from the motor chamber to house the first coil, thus reducing the thickness of the magnetic levitation pump and facilitating its miniaturization. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a magnetic levitation pump according to an embodiment of this application from one perspective.

[0022] Figure 2 for Figure 1 The diagram shows the structure of the magnetic levitation pump from another perspective.

[0023] Figure 3 for Figure 2 A cross-sectional view along the AA direction.

[0024] Figure 4 for Figure 2 A cross-sectional view along the BB direction.

[0025] Figure 5 This is a schematic diagram of the drive motor in a magnetic levitation pump according to an embodiment of this application.

[0026] Figure 6 for Figure 5 The diagram shows the structure of the drive motor (excluding the rotor).

[0027] Figure 7 for Figure 6 The image shows a top view of the drive motor.

[0028] Figure 8 for Figure 7 A magnified structural diagram at point A.

[0029] Figure 9 for Figure 1 The diagram shows the structure of the pump casing and fixing components of the magnetic levitation pump.

[0030] Figure 10 for Figure 1 The image shows an exploded view of the magnetic levitation pump from one perspective.

[0031] Figure 11 for Figure 1 The diagram shows an exploded view of the magnetic levitation pump from another perspective.

[0032] Figure 12 A longitudinal sectional view of a magnetic levitation pump provided in another embodiment of this application.

[0033] Figure 13 for Figure 12 The diagram shows a positional relationship between the central magnet and the first magnetic ring of the magnetic levitation pump.

[0034] Figure 14 for Figure 12 The diagram shows another positional relationship between the central magnet and the first magnetic ring of the magnetic levitation pump.

[0035] 1. Magnetic levitation pump; 10. Pump casing; 101. Pressurization chamber; 102. Motor chamber; 11. Partition; 111. Positioning groove; 12. Drain cone; 13. Liquid inlet; 14. Liquid outlet; 20. Impeller; 21. First through hole; 22. Second through hole; 30. Drive motor; 31. Rotor; 311. Fourth magnetic ring; 32. Stator; 32a. Drive unit; 321. Iron core; 322. Coil winding; 323. Pole shoe; 3231. Side; 40. Axial drive assembly; 41. First magnetic ring; 42. First coil; 501. Fixing assembly; 51. Support; 52. Magnetic ring fixing component; 521. Positioning protrusion; 61. Second magnetic ring; 62. Third magnetic ring; 621. Outer peripheral surface; 70. Central magnet. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] See Figures 1 to 4This application provides an embodiment of a magnetic levitation pump 1, which includes a pump casing 10, an impeller 20, a drive motor 30, and an axial drive assembly 40. The pump casing 10 has a spaced-apart pressurization chamber 101 and a motor chamber 102. The impeller 20 is rotatably suspended in the pressurization chamber 101. The drive motor 30 includes a rotor 31 and a stator 32. The rotor 31 is fixedly connected to the impeller 20, and the stator 32 is disposed in the motor chamber 102. The stator 32 cooperates with the rotor 31 to generate a rotating magnetic field that can rotate the impeller 20. The axial drive assembly 40 includes a first magnetic ring 41 and a first coil 42. The first magnetic ring 41 is fixedly connected to the impeller 20, and the first coil 42 is disposed in the motor chamber 102. The first coil 42 cooperates with the first magnetic ring 41 to adjust the axial force that levitates the impeller 20.

[0038] The drive motor 30 is used to control the current and / or voltage of the stator 32 to adjust the rotational speed of the rotor 31. The axial drive assembly 40 is used to control the current and / or voltage of the first coil 42 to adjust the magnetic force between the first magnetic ring 41 and the first coil 42.

[0039] The aforementioned magnetic levitation pump 1 generates a rotating magnetic field that enables the impeller 20 to rotate through the cooperation of the stator 32 and the rotor 31. Furthermore, the first coil 42 cooperates with the first magnetic ring 41 to adjust the axial force that levitates the impeller 20, thereby regulating and controlling the levitation height of the impeller 20. Compared to related technologies where both the rotational speed and levitation height of the impeller 20 are controlled by parameters of the stator 32 of the drive motor 30, this provides a hardware foundation for independent control of the impeller 20's rotation and levitation height. This allows the control of the impeller 20's rotation and levitation height in the magnetic levitation pump 1 to be handled by two separate systems, eliminating the need for complex decoupling and reducing the difficulty of controlling the impeller 20. Additionally, the first coil 42 is located in the motor chamber 102. Compared to designs where the first coil 42 and the stator 32 are located on opposite sides of the impeller 20, this avoids the need for additional space on the side of the impeller 20 furthest from the motor chamber 102 to house the first coil 42. This reduces the thickness of the magnetic levitation pump 1 and facilitates its miniaturization.

[0040] Please see Figure 1 , Figure 3 and Figure 4 In one embodiment, the stator 32 and the first coil 42 are disposed inside the motor chamber 102, and the pump housing 10 provides good sealing protection to prevent blood from contacting the stator 32 and the first coil 42 respectively and causing damage. In addition, the stator 32 and the first coil 42 are supported by the pump housing 10, which serves to fix the stator 32 and the first coil 42.

[0041] Please see Figure 3In one embodiment, the stator 32 is wound around the periphery of the first coil 42, and the rotor 31 is wound around the periphery of the first magnetic ring 41. Of course, the first coil 42 can also be wound around the periphery of the stator 32, and correspondingly, the first magnetic ring 41 can be wound around the periphery of the rotor 31.

[0042] Please see Figure 3 In one embodiment, the first magnetic ring 41 and the first coil 42 are coaxially arranged along the axial direction of the impeller 20. That is, when the impeller 20 is stationary or the rotation axis of the impeller 20 remains unchanged, the axis of the first magnetic ring 41 coincides with the axis of the first coil 42. In this embodiment, the outer diameter of the first magnetic ring 41 can be equal to the outer diameter of the first coil 42. In other embodiments, the outer diameter of the first magnetic ring 41 can be larger or smaller than the outer diameter of the first coil 42, as long as the axis of the first magnetic ring 41 coincides with the axis of the first coil 42. In this way, when the first coil 42 is energized, the magnetic force on the first magnetic ring 41 is axial, avoiding the formation of a radial component force, thereby increasing the magnitude of the magnetic force between the first magnetic ring 41 and the first coil 42.

[0043] It should be noted that, in this embodiment, the axial direction refers to the axial direction of the magnetic levitation pump 1, such as... Figures 2 to 4 The double arrow on the Z-axis is shown in the diagram.

[0044] Please see Figure 3 or Figure 4 In one embodiment, the inner diameter of the first magnetic ring 41 is equal to the inner diameter of the first coil 42, and the outer diameter of the first magnetic ring 41 is equal to the outer diameter of the first coil 42. That is, the cross-section of the first magnetic ring 41 and the cross-section of the first coil 42 can completely overlap. Thus, compared to an arrangement where the outer diameter of the first magnetic ring 41 is larger than the outer diameter of the first coil 42, the first magnetic ring 41 can avoid affecting the interaction between the stator 32 and the rotor 31. Compared to an arrangement where the outer diameter of the first magnetic ring 41 is smaller than the outer diameter of the first coil 42, the magnetic field generated by the first coil 42 can avoid interfering with the rotor 31 or other magnets. This allows for more independent control of the rotation and levitation height of the impeller 20, thereby further reducing the difficulty of controlling the impeller 20.

[0045] Please see Figure 3In one embodiment, the magnetic levitation pump further includes a second magnetic ring 61 and a third magnetic ring 62, wherein the second magnetic ring 61 is disposed inside the impeller 20, and the third magnetic ring 62 is disposed outside the pressurization chamber 101. In one embodiment, the third magnetic ring 62 may be disposed inside the motor chamber 102. The second magnetic ring 61 and the third magnetic ring 62 are magnetically coupled, and the force between the second magnetic ring 61 and the third magnetic ring 62 is in the same direction as the force between the first coil 42 and the first magnetic ring 41. That is, while the first coil 42 generates a repulsive force acting on the first magnetic ring 41, the third magnetic ring 62 also generates a repulsive force acting on the second magnetic ring 61. In this way, the force between the first coil 42 and the first magnetic ring 41 after energization can be reduced, thereby reducing the current / voltage flowing through the first coil 42 and saving energy.

[0046] The second magnetic ring 61 surrounds the first magnetic ring 41. The second magnetic ring 61 and the third magnetic ring 62 are arranged opposite each other in the axial direction of the impeller 20. In this way, the magnetic force between the second magnetic ring 61 and the third magnetic ring 62 is along the axial direction, avoiding the formation of a radial component force, thereby increasing the magnitude of the magnetic force between the second magnetic ring 61 and the third magnetic ring 62.

[0047] In one embodiment, the first magnetic ring 41 and the second magnetic ring 61 are respectively, including but not limited to, embedded inside the impeller 20 or disposed on the surface of the impeller 20, and can be flexibly adjusted and set according to actual needs.

[0048] In one specific embodiment, the second magnetic ring 61 is located between the first magnetic ring 41 and the rotor 31. Of course, in other embodiments, the second magnetic ring 61, the first magnetic ring 41, and the rotor 31 can be arranged flexibly in other ways, which are not limited here.

[0049] In this embodiment, the inner diameters of the second magnetic ring 61 and the third magnetic ring 62 are larger than the outer diameter of the first coil 42, avoiding mutual interference between the first coil 42 and the second and third magnetic rings 61 and 62 after energization. For example, this avoids the first coil 42 interfering with the magnetic engagement between the second and third magnetic rings 61 and 62, and also avoids the second and third magnetic rings 61 and 62 interfering with the magnetic engagement between the first magnetic ring 41 and the first coil 42. This allows for more independent control of the impeller 20's rotation and levitation height, further reducing the difficulty of controlling the impeller 20.

[0050] Please see Figure 3 and Figure 9In one embodiment, the pump housing 10 further includes a partition 11, which divides the pump housing 10 into a pressurization chamber 101 and a motor chamber 102. The magnetic levitation pump 1 also includes a fixing component 501 disposed within the motor chamber 102. The fixing component 501 abuts against the partition 11 to press the third magnetic ring 62 between the fixing component 501 and the partition 11, thereby preventing the third magnetic ring 62 from moving and ensuring a stable fit between the second magnetic ring 61 and the third magnetic ring 62.

[0051] The fixing assembly 501 includes a support member 51 and a magnetic ring fixing member 52. The magnetic ring fixing member 52 is connected to the support member 51 and inserted into the partition 11. The magnetic ring fixing member 52 is used to fix the third magnetic ring 62. Thus, since the third magnetic ring 62 is disposed within the motor chamber 102, it provides a sealing and protective function for the third magnetic ring 62. In addition, the third magnetic ring 62 is supported and fixed by the magnetic ring fixing member 52. Furthermore, the distance between the third magnetic ring 62 and the second magnetic ring 61 is relatively close, thereby increasing the repulsive force of the third magnetic ring 62 on the second magnetic ring 61. The closer the distance between the third magnetic ring 62 and the second magnetic ring 61, the greater the repulsive force they generate.

[0052] Optionally, the support member 51 may include, but is not limited to, a support column, the cross-section of which may include, but is not limited to, regular or irregular shapes such as circles, ellipses, and polygons. Furthermore, the magnetic ring fixing member 52 may include, but is not limited to, a fixing plate, the fixing plate may include, but is not limited to, a plate with a circular outline, specifically adapted to the shape of the third magnetic ring 62, thereby providing stable support for the third magnetic ring 62.

[0053] In one embodiment, the support member 51 and the magnetic ring fixing member 52 are made of non-ferromagnetic materials. This prevents interference with other magnetic rings when supporting and fixing the third magnetic ring 62, thereby improving the reliability of the magnetic levitation pump 1 during operation.

[0054] It should be noted that the “support member 51” can be a part of the “magnetic ring fastener 52”, that is, the “support member 51” and the “other parts of the magnetic ring fastener 52” can be integrally formed; or it can be a separate component that can be separated from the “other parts of the magnetic ring fastener 52”, that is, the “support member 51” can be manufactured independently and then combined with the “other parts of the magnetic ring fastener 52” to form a whole.

[0055] Please see Figure 3 , Figures 9 to 11The magnetic ring fixing member 52 has a positioning protrusion 521 on the side facing the partition 11, and the positioning protrusion 521 passes through the third magnetic ring 62. Furthermore, the partition 11 has a positioning groove 111 on the side facing the fixing assembly 501, and the third magnetic ring 62 is at least partially fitted and received in the positioning groove 111. Thus, on the one hand, the positioning protrusion 521 and / or the positioning groove 111 can effectively fix the third magnetic ring 62; on the other hand, after the third magnetic ring 62 is inserted into the positioning groove 111, the distance between the third magnetic ring 62 and the second magnetic ring 61 can be reduced, thereby increasing the magnetic force between them.

[0056] As an alternative, the magnetic ring fixing member 52 has a positioning protrusion 521 on the side facing the partition 11, and the positioning protrusion 521 passes through the third magnetic ring 62.

[0057] As an alternative, the partition 11 has a positioning groove 111 on the side facing the magnetic ring fixing member 52, and the third magnetic ring 62 is at least partially adapted to be received in the positioning groove 111.

[0058] Optionally, the positioning protrusion 521 abuts tightly against the surface of the partition 11.

[0059] Please see Figure 3 , Figures 5 to 7 In one embodiment, the stator 32 includes a plurality of drive units 32a, each of which cooperates with the rotor 31. The plurality of drive units 32a are arranged around the first coil 42, and the rotor 31 is arranged around the first magnetic ring 41, such that the first coil 42 and the stator 32 at least partially overlap in the axial direction of the impeller 20, which facilitates reducing the space of the motor chamber 102 used to house the first coil 42 and the stator 32, thereby further facilitating the miniaturization of the magnetic levitation pump 1.

[0060] Each drive unit 32a includes an iron core 321, a coil winding 322, and a pole piece 323. Each coil winding 322 is correspondingly disposed on each iron core 321. The pole piece 323 is connected to the side of the iron core 321 near the partition 11. Multiple pole pieces 323 are arranged around the third magnetic ring 62, and the side surface 3231 of each pole piece 323 is opposite to and shape-fitting the outer peripheral surface 621 of the third magnetic ring 62. ， Thus, during installation, the pole shoe 323 can be radially positioned by the third magnetic ring 62, and then the pole shoe 323 can be connected and fixed to the iron core 321. This eliminates the need for additional positioning rings to position the pole shoe 323, thereby greatly saving costs and also saving internal space of the magnetic levitation pump 1, which further facilitates the miniaturization of magnetic levitation and the lightweighting of the magnetic levitation pump 1.

[0061] In addition, the rotor 31 includes a fourth magnetic ring 311. The fourth magnetic ring 311 is positioned opposite to each iron core 321 and is used to generate a magnetic attraction with the coil winding 322.

[0062] Please see Figure 5 In one embodiment, multiple coil windings 322 are arranged around the first coil 42. The radius of the inscribed circle formed by the multiple coil windings 322 is larger than the outer diameter of the first magnetic ring 41, which avoids mutual interference between the first magnetic ring 41 and the coil windings 322, and further reduces the difficulty of controlling the impeller 20.

[0063] Please see Figure 4 In one embodiment, the side of the coil winding 322 facing the partition 11 is flush with the side of the first coil 42 facing the partition 11. Thus, compared to the arrangement where the side of the coil winding 322 facing the partition 11 is not flush with the side of the first coil 42 facing the partition 11, the structural layout is more compact and the overall size of the magnetic levitation pump 1 is smaller.

[0064] Please see Figure 3 , Figures 6 to 8 In one specific embodiment, each pole piece 323 is wound around the outer peripheral surface 621 of the third magnetic ring 62 and abuts against the outer peripheral surface 621 of the third magnetic ring 62, or a gap d is provided between the outer peripheral surfaces 621 of the third magnetic ring 62 and the outer peripheral surfaces 621 of the third magnetic ring 62. This gap d needs to meet a certain range, for example, d is less than or equal to 0.2 mm. In addition, the outer peripheral surface 621 of the third magnetic ring 62 is, but is not limited to, a circular outline, and the side surface 3231 of the pole piece 323 is, but is not limited to, a circular outline, as long as the side surface 3231 of the pole piece 323 is opposite to and fits the outer peripheral surface 621 of the third magnetic ring 62. In this embodiment, the outer peripheral surface 621 of the third magnetic ring 62 is a circular outline, and the side surface 3231 of the pole piece 323 is correspondingly set to an arc shape.

[0065] Please see Figure 3 In one specific embodiment, the first coil 42 is sleeved on the support member 51. Thus, the support member 51 not only supports the magnetic ring fixing member 52 but also positions the first coil 42. Furthermore, the second magnetic ring 61 is wound around the outside of the first magnetic ring 41, and the inner circumferential surface of the second magnetic ring 61 is spaced from the outer circumferential surface of the first magnetic ring 41. In this way, the structural arrangement of each component is compact and reasonable, reducing the overall volume of the magnetic levitation pump 1.

[0066] It should be noted that the inner circumferential surface of the second magnetic ring 61 and the outer circumferential surface of the first magnetic ring 41 can be separated by air or by non-magnetic material, for example, by potting glue between the second magnetic ring 61 and the first magnetic ring 41.

[0067] Please see Figure 9 , Figures 12 to 14 In one embodiment, the bottom wall of the pressurization chamber 101 is provided with a flow-guiding cone 12. The flow-guiding cone 12 extends into the impeller 20. Specifically, the middle portion of the impeller 20 is provided with a first through hole 21, and the flow-guiding cone 12 extends into the first through hole 21. The magnetic levitation pump 1 also includes a central magnet 70, which is disposed within the flow-guiding cone 12. A first magnetic ring 41 surrounds the outer periphery of the central magnet 70, and the central magnet 70 and the first magnetic ring 41 have a height difference along the axial direction, and the two at least partially overlap in the axial direction. The central magnet 70 is used to apply an axial force to the first magnetic ring 41 toward the bottom wall away from the pressurization chamber 101. In this way, the central magnet 70 can cooperate with the first magnetic ring 41 to provide an upward force to the first magnetic ring 41, thereby further reducing the current / voltage flowing through the first coil 42 and saving energy.

[0068] Please see Figure 12 and Figure 13 In one embodiment, the distance between the lower surface of the central magnet 70 and the bottom wall of the pressurization chamber 101 is greater than the distance between the lower surface of the first magnetic ring 41 and the bottom wall of the pressurization chamber 101, and the magnetic poles of the upper surfaces of the central magnet 70 and the first magnetic ring 41 are the same; or, please refer to Figure 14 The distance between the lower surface of the central magnet 70 and the bottom wall of the pressurization chamber 101 is smaller than the distance between the lower surface of the first magnetic ring 41 and the bottom wall of the pressurization chamber 101, and the magnetic poles of the central magnet 70 and the upper surface of the first magnetic ring 41 are opposite.

[0069] Please see Figure 1 and Figure 12 In one embodiment, the pressurization chamber 101 is further provided with an inlet 13 and an outlet 14. During operation, the impeller 20 rotates, providing power to allow blood to enter through the inlet 13, be pressurized, and then discharged outward through the outlet 14. Specifically, the impeller 20 is also provided with a second through hole 22 that communicates with the first through hole 21. The first through hole 21 is positioned opposite to the inlet 13. Liquid enters the first through hole 21 through the inlet 13, is guided by the guide cone 12 to the second through hole 22, and flows from the second through hole 22 to the outlet 14 under the action of centrifugal force, and is discharged outward through the outlet 14.

[0070] In the description of this application, it should be understood that if the term "A and / or B" appears, it means that there are three cases: A, B, and A and B.

[0071] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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 this application 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 this application.

[0072] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A magnetic levitation pump, characterized in that, The magnetic levitation pump includes: The pump casing is provided with a spaced-out pressurization chamber and a motor chamber; An impeller, which is rotatably suspended in the pressurization chamber; A drive motor, comprising a rotor and a stator, wherein the rotor is fixedly connected to the impeller, and the stator is disposed in the motor chamber, the stator cooperating with the rotor to generate a rotating magnetic field capable of rotating the impeller; and An axial drive assembly includes a first magnetic ring and a first coil. The first magnetic ring is fixedly connected to the impeller, and the first coil is disposed in the motor chamber. The first coil and the first magnetic ring cooperate to adjust the axial force that suspends the impeller, so that the rotation of the impeller and the control of the suspension height of the magnetic levitation pump can be controlled by two separate systems. The stator includes multiple drive units, each of which cooperates with the rotor. The multiple drive units are arranged around the first coil, and the rotor is arranged around the first magnetic ring, so that the first coil and the stator at least partially overlap in the axial direction of the impeller.

2. The magnetic levitation pump according to claim 1, characterized in that, The first magnetic ring and the first coil are coaxially arranged along the axial direction of the impeller.

3. The magnetic levitation pump according to claim 1, characterized in that, The inner diameter of the first magnetic ring is equal to the inner diameter of the first coil, and the outer diameter of the first magnetic ring is equal to the outer diameter of the first coil.

4. The magnetic levitation pump according to claim 1, characterized in that, The magnetic levitation pump further includes a second magnetic ring and a third magnetic ring; wherein, the second magnetic ring is disposed inside the impeller, and the third magnetic ring is disposed outside the pressurization chamber, the second magnetic ring and the third magnetic ring are magnetically coupled, and the force between the second magnetic ring and the third magnetic ring is in the same direction as the force between the first coil and the first magnetic ring.

5. The magnetic levitation pump according to claim 4, characterized in that, The second magnetic ring surrounds the first magnetic ring, and the second magnetic ring and the third magnetic ring are arranged opposite each other in the axial direction of the impeller.

6. The magnetic levitation pump according to claim 4, characterized in that, The pump casing also includes a partition plate that divides the inner cavity of the pump casing into the pressurization chamber and the motor chamber. The magnetic levitation pump also includes a fixing component disposed in the motor chamber. The fixing component abuts against the partition plate to press the third magnetic ring between the fixing component and the partition plate.

7. The magnetic levitation pump according to claim 6, characterized in that, The partition plate has a positioning groove on the side facing the fixing component, and the third magnetic ring is at least partially adapted to be received in the positioning groove; and / or, the fixing component is made of a non-ferromagnetic material.

8. The magnetic levitation pump according to claim 6, characterized in that, The stator includes multiple drive units, each drive unit including an iron core, a coil winding and a pole shoe. The coil winding is wound around the iron core, and the pole shoe is connected to the side of the iron core near the partition. Multiple pole shoes are arranged around the third magnetic ring, and the side of each pole shoe is opposite to the outer peripheral surface of the third magnetic ring and is adapted in shape.

9. The magnetic levitation pump according to any one of claims 1 to 8, characterized in that, The bottom wall of the pressurization chamber is provided with a flow-guiding cone, which extends into the impeller; the magnetic levitation pump also includes a central magnet, which is disposed inside the flow-guiding cone; the first magnetic ring surrounds the outer periphery of the central magnet, and the first magnetic ring and the central magnet have a height difference along the axial direction of the magnetic levitation pump, and the two at least partially overlap in the axial direction of the magnetic levitation pump.

10. The magnetic levitation pump according to claim 9, characterized in that, The distance between the lower surface of the central magnet and the bottom wall of the pressurization chamber is greater than the distance between the lower surface of the first magnetic ring and the bottom wall of the pressurization chamber, and the magnetic poles of the central magnet and the upper surface of the first magnetic ring are the same.

11. The magnetic levitation pump according to claim 9, characterized in that, The distance between the lower surface of the central magnet and the bottom wall of the pressurization chamber is less than the distance between the lower surface of the first magnetic ring and the bottom wall of the pressurization chamber, and the magnetic poles of the central magnet and the upper surface of the first magnetic ring are opposite.

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