Magnetic levitation pump

Abstract

The present invention provides a magnetic levitation pump, which includes an impeller, a control component and a motor, wherein the impeller can rotate, the control component includes a control circuit board, the motor includes a rotor and a stator, the rotor is fixedly connected to the impeller, the stator is fixedly connected to the control circuit board, and the stator is electrically connected to the control circuit board, the stator can generate a rotating magnetic field so that the rotor can suspend and rotate, so that the impeller can suspend and rotate with the rotor, and the control circuit board can control the intensity of the magnetic field generated by the stator. The magnetic levitation pump integrates the motor and the controller into one, so that the volume of the magnetic levitation pump becomes smaller, which is conducive to reducing the overall volume of the magnetic levitation pump.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical equipment, and in particular to a magnetic suspension pump. Background Art

[0002] The incidence of cardiovascular diseases is increasing year by year, and cardiogenic shock and heart failure are critically ill patients with extremely high mortality rates. Currently, the main device for treating cardiovascular diseases is an artificial ventricular assist device, and the artificial ventricular assist device is mainly a magnetic levitation centrifugal blood pump. The motor controller controls the motor coil in the motor to generate a rotating electromagnetic field to drive the magnetic impeller to rotate, so that blood is sucked from the liquid inlet of the magnetic levitation centrifugal blood pump and discharged from the liquid outlet after passing through the impeller, thereby realizing the circulation of blood. However, the motor controller and motor of the current magnetic levitation centrifugal blood pump are both set inside the casing, but the setting is not reasonable, resulting in a large volume of the magnetic levitation blood pump. Summary of the invention

[0003] Based on this, it is necessary to provide a magnetic levitation pump with a smaller volume.

[0004] A magnetic levitation pump, the magnetic levitation pump comprising an impeller, a control component and a motor, the impeller being capable of rotating, the control component comprising a control circuit board, the motor comprising a rotor and a stator, the rotor being fixedly connected to the impeller, the stator being fixedly connected to the control circuit board, and the stator being electrically connected to the control circuit board, wherein the stator is capable of generating a rotating magnetic field so that the rotor is capable of suspending and rotating, so that the impeller is capable of suspending and rotating with the rotor, and the control circuit board is capable of controlling the strength of the magnetic field generated by the stator.

[0005] The stator of the motor of the magnetic levitation pump of the present invention is fixedly connected to the control circuit board to integrate the stator of the motor and the controller, and the impeller and the rotor are fixedly connected and integrated together, which is beneficial to reducing the space occupied by the motor and the motor controller, so that the internal space of the magnetic levitation blood pump is reasonably utilized, which is beneficial to reducing the overall volume of the magnetic levitation pump and realizing the miniaturization of the magnetic levitation blood pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0007] Figure 1 is a schematic diagram of the three-dimensional structure of the magnetic levitation pump of the first embodiment;

[0008] Figure 2 yes Figure 1 The three-dimensional exploded schematic diagram of the magnetic levitation pump shown;

[0009] Figure 3 for Figure 1 A cross-sectional view of the magnetically suspended blood pump shown;

[0010] Figure 4 yes Figure 2 A cross-sectional view of a connection frame of the magnetic levitation pump shown;

[0011] Figure 5 yes Figure 2 A schematic diagram of the assembled three-dimensional structure of the stator and control assembly of the magnetic levitation pump shown;

[0012] Figure 6 yes Figure 5 An assembled side view of the stator and control assembly is shown;

[0013] Figure 7 yes Figure 5 A schematic diagram of the three-dimensional structure of the control assembly shown;

[0014] Figure 8 is a schematic structural diagram of the stator and control assembly of the magnetic levitation pump provided by the second embodiment of the present invention after assembly;

[0015] Fig. 9 yes Figure 8 A schematic diagram of the three-dimensional structure of the control assembly shown;

[0016] Fig.10 is a schematic structural diagram of a control assembly of a magnetic levitation pump provided in a third embodiment of the present invention;

[0017] Fig.11 yes Fig.10 A schematic diagram of the three-dimensional structure of the control assembly shown;

[0018] Fig.12 is a schematic structural diagram of a control assembly of a magnetic levitation pump provided in a fourth embodiment of the present invention;

[0019] Fig.13 is a schematic structural diagram of the stator and control assembly of the magnetic levitation pump provided in the fifth embodiment of the present invention after assembly;

[0020] Fig.14 yes Fig.13 A schematic diagram of the three-dimensional structure of the control assembly shown;

[0021] Fig.15 is a schematic structural diagram of the assembled stator and control assembly of the magnetic levitation pump provided by the sixth embodiment of the present invention;

[0022] Fig.16 yes Fig.15A schematic diagram of the three-dimensional structure of the control component in FIG.

[0023] Fig.17 It is a schematic structural diagram of the assembled stator and control assembly of the magnetic levitation pump provided by the seventh embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, the tissue between the left atrium and the right atrium of the present invention is called the atrial septum, the "proximal end" refers to the end close to the connection position of the conveyor, and the "distal end" refers to the end away from the connection position of the conveyor. The axial direction refers to the direction of the central axis of the device, and the radial direction is the direction perpendicular to the central axis. This definition is only for the convenience of expression and cannot be understood as a limitation of the present invention.

[0026] See also Figures 1 to 3 The magnetic levitation pump 100 provided in the first embodiment includes a housing 20 and an impeller 40, a control component 60 and a motor 70 disposed in the housing 20. The impeller 40 can rotate, the control component 60 includes a control circuit board 62, the motor 70 includes a rotor 72 fixed to the impeller 40 and a stator 74 fixed to the control circuit board 62, the stator 74 is electrically connected to the control circuit board 62, the stator 74 can generate a magnetic field to enable the rotor 72 to suspend and rotate, so that the impeller 40 can suspend and rotate with the rotor 72, and the control circuit board 60 can control the magnetic field strength generated by the stator 74. That is, the control component 60 is used to control the operation of the motor 70.

[0027] In one embodiment, the magnetic levitation pump 100 is a magnetic levitation ventricular assisted centrifugal blood pump, which is suitable for treating acute myocardial infarction, severe myocarditis, and heart failure caused by acute cardiogenic shock after cardiac surgery.

[0028] The stator 74 of the magnetic levitation pump 100 of the present invention is integrated with the control component 60, which is beneficial to reducing the space occupied by the motor 70 and the control component 60 used to control the operation of the motor 70, so that the internal space of the shell 20 is reasonably utilized, which is beneficial to reducing the overall volume of the magnetic levitation pump 100 and realizing the miniaturization of the magnetic levitation blood pump 100.

[0029] like Figure 3As shown, specifically, the housing 20 has an accommodating cavity 27 and a sealed cavity 28 spaced apart, and a liquid inlet 21 and a liquid outlet 22 communicating with the accommodating cavity 27 are provided on the housing 20. The control assembly 60 and the stator 74 are both accommodated in the sealed cavity 28. Specifically in the illustrated embodiment, the housing 20 includes a first shell 23, a middle shell 24 and a second shell 26, the middle shell 24 is fixedly connected between the first shell 23 and the second shell 26, the first shell 23 and the middle shell 24 are jointly enclosed to form the accommodating cavity 27, and the second shell 26 and the middle shell 24 are jointly enclosed to form the sealed cavity 28.

[0030] Specifically, the first housing 23 includes an upper cover 231 and an inlet pipe 232 disposed on the upper cover 231 and fixedly connected to the upper cover 231 at one end. The upper cover 231 has a first accommodating space 233 (such as Figure 7 As shown in the figure, the liquid inlet 21 is an opening of the end of the inlet pipe 232 away from the upper cover 231. In this embodiment, the outer peripheral wall of the first shell 23 is provided with a first extension rod 234, and the first extension rod 234 is provided with a through groove (not marked in the figure) extending along its extension direction and connected to the first accommodating space 233. A clamping edge 236 is provided on one side edge of the upper cover 231 away from the inlet pipe 232.

[0031] Please also read Figure 2 to Figure 4 The profile of the middle shell 24 facing the first shell 23 is similar to the profile of the side of the first shell 23 away from the inlet pipe 232. A second accommodation space 242 is provided in the middle of the side of the middle shell 24 facing the first shell 23. The second accommodation space 242 of the middle shell 24 corresponds to and communicates with the first accommodation space 233 of the first shell 23. The second accommodation space 242 and the first accommodation space 233 together constitute the accommodation chamber 27 of the outer shell 20. In this embodiment, the inner diameter of the first accommodation space 242 is equal to the inner diameter of the second accommodation space 242. A second extension rod 243 is convexly provided on the outer peripheral wall of the middle shell 24. The second extension rod 243 is provided with a through groove 244 extending along its extension direction and communicating with the second accommodation space 242. The through groove 244 of the middle shell 24 corresponds to and communicates with the through groove of the first extension rod 234 of the first shell 23 to form an outlet pipe communicating with the accommodation chamber 27. The liquid outlet 22 is the end of the outlet pipe away from the accommodation chamber 27.

[0032] A receiving barrel 247 is formed on the middle shell 24. The receiving barrel 24 is connected to the accommodating chamber 27. The bottom of the receiving barrel 24 extends toward the inside of the sealing chamber 28. The receiving barrel 24 and the accommodating chamber 27 together accommodate the impeller 40. The rotor 72 is at least partially accommodated in the receiving barrel 24. Specifically, in the illustrated embodiment, the middle shell 24 is provided with an installation space 245 on the side away from the first accommodating space 242. The middle shell 24 forms a partition 246 between the second accommodating space 242 and the installation space 245. The middle part of the partition 246 is recessed toward the installation space 245 to form the receiving barrel 247. The cross section of the receiving barrel 247 is annular. A positioning column 248 is arranged in the receiving barrel 247. The positioning column 248 is arranged on the rotation axis of the impeller 40 and extends along the rotation axis of the impeller 40. That is, the positioning column 248 is located in the middle of the inner bottom surface of the receiving barrel 247 and extends into the first accommodating space 242. A snap-fitting groove 249 is formed on an edge of the middle shell 24 facing the first shell 23 and is matched with the snap-fitting edge 236 .

[0033] like Figure 2 As shown, the second shell 26 is sealed and connected to the middle shell 24. A fixed space 262 is provided on the side of the second shell 26 facing the middle shell 24. The fixed space 262 communicates with the installation space 245 to form a sealed cavity 28. The outer peripheral wall of the second shell 26 is provided with a connecting portion 264 for connecting a cable. The cable is electrically connected to the control component 60 in the sealed cavity 28 through the connecting portion 264. The cable contains a power line and a signal line.

[0034] The cross section of the impeller 40 is circular. A base 403 is provided on one side of the impeller 40. The impeller 40 and the base 403 are an integral structure. The base 403 is a hollow annular structure. The rotor 72 is provided in the base 403 (such as Figure 3 As shown). The inner diameter of the rotating hole 405 is larger than the diameter of the positioning column 248, so that the positioning column 248 of the middle shell 24 can be inserted into the rotating hole 405. The impeller 40 is provided with a connecting hole 406, which extends along the axis of the impeller 40 and is connected to the rotating hole 405. The impeller 40 is also provided with a plurality of liquid outlet grooves 407 connected to the connecting hole 406 and extending along the radial direction of the impeller 40. In the circumferential direction of the impeller 40, the plurality of liquid outlet grooves 407 are evenly spaced and arranged. Specifically, the base 403 is coaxial with the impeller 40. The axis of the rotating hole 405 is colinear with the axis of the connecting hole 406. In this embodiment, the rotor 72 is a permanent magnet.

[0035] Please also read Figure 2 , Figure 5-Figure 7The stator 74 includes a stator yoke 741, a plurality of stator teeth 743 and a plurality of stator coils 745. The plurality of stator teeth 743 are fixed to the stator yoke 741, and the plurality of stator coils 745 are respectively mounted on the plurality of stator teeth 743. The plurality of stator coils 745 are electrically connected to the control circuit board 62. Specifically, in the illustrated embodiment, the stator yoke 741 is an annular structure, and the stator yoke 741 has two opposite openings 746. The receiving barrel 247 is partially received in the stator yoke 741. The plurality of stator coils 745 are arranged at intervals on the inner circumferential wall of the stator yoke 741, and the plurality of stator coils 745 are arranged at intervals along the circumferential direction of the inner circumferential wall of the stator yoke 741. Specifically, the plurality of stator teeth 743 are evenly arranged at intervals along the circumferential direction of the inner circumferential wall of the stator yoke 741, and the plurality of stator coils 745 are respectively sleeved on the plurality of stator teeth 743. In this embodiment, the number of stator teeth 743 is six, and the six stator teeth 743 are arranged in a circumferential annular array along the inner circumferential wall of the stator yoke 741, and the angle between each two adjacent stator teeth 743 is 60 degrees; the number of stator coils 745 is six, and the six stator coils 745 are respectively sleeved on the six stator teeth 743. It can be understood that the number of stator teeth 743 is not limited to six, and the number of stator teeth 743 can be set as needed. Each stator tooth 743 includes a rod portion extending radially along the stator yoke 741 and a pole shoe arranged at one end of the rod portion away from the stator yoke 741, and a stator coil 745 is arranged on each rod portion.

[0036] Furthermore, the control assembly 60 also includes a sensor component 64 electrically connected to the control circuit board 62, and the sensor component 64 is used to detect the position of the rotor 72, and can transmit the position data of the rotor 72 to the control circuit board 62. Among them, the control circuit board 62 can control the current size of the stator coil 745 according to the position data. The sensor component 64 and the control circuit board 62 are both fixed to the stator yoke 741. Among them, the sensor component 64, the stator yoke 741 and the control circuit board 62 are arranged along the rotation axis of the rotor 72. Specifically in the illustrated embodiment, the sensor component 64 and the control circuit board 62 are respectively located on opposite sides of the stator yoke 741, and are respectively arranged opposite to the two openings 746 of the stator yoke 741. The sensor component 64 has a through hole 645, and the receiving barrel 247 is penetrated through the through hole 645. Specifically, the through hole 645 is roughly circular, and the axis of the through hole 645 coincides with the rotation axis of the rotor 72.

[0037] Specifically, the sensing component 64 includes a sensing circuit board 642 electrically connected to the control circuit board 62, and a sensor 644 arranged on the sensing circuit board 642. The sensor 644 is used to detect the position of the rotor 72, and can transmit the position data of the rotor 72 to the control circuit board 62 through the sensing circuit board 642. The sensing circuit board 642 and the control circuit board 62 are respectively fixed to the two sides of the stator yoke 741, and are respectively arranged opposite to the two openings 746 of the stator yoke 741. Specifically, the through hole 645 is located in the middle of the sensing circuit board 642. The sensing circuit board 642 is a circular ring structure. There are a plurality of sensors 644, and the plurality of sensors 644 are arranged around the rotor 72. Specifically, the plurality of sensors 644 are evenly spaced along the edge of the through hole 645. The plurality of sensors 644 are all position sensors, such as Hall sensors, eddy current sensors, etc. The plurality of sensors 644 may be arranged on the side of the sensor circuit board 642 facing away from the control circuit board 62, or on the side of the sensor circuit board 642 facing the control circuit board 62, or respectively on two opposite sides of the sensor circuit board 642. In this embodiment, the number of sensors 644 is six, and the six sensors 644 are arranged at intervals along the edge of the through hole 645, that is, the degree of the central angle corresponding to the arc between two adjacent sensors 644 is 60 degrees. It should be noted that the number of sensors 644 is not limited to six, and the number of sensors 644 can be set as needed.

[0038] like Figure 5 and Figure 6 As shown, in this embodiment, the control circuit board 62 and the sensor circuit board 642 are fixedly connected to opposite sides of the stator yoke 741 through the connecting rod 748. More specifically, the control circuit board 62 and the sensor circuit board 642 are respectively opposite to the two openings 746 of the stator yoke 741. The middle part of the connecting rod 748 is fixedly connected to the stator yoke 741, and the sensor circuit board 642 and the control circuit board 62 are respectively fixedly connected to the two ends of the connecting rod 748. In the embodiment shown in the figure, there are a plurality of connecting rods 748.

[0039] like Figure 7 As shown, the control circuit board 62 and the sensor circuit board 642 are electrically connected via the flexible circuit board 69. Since the flexible circuit board 69 can be bent, it is convenient to install the control circuit board 62 and the sensor circuit board 642. Specifically, the control circuit board 62 is a circular plate.

[0040] Please also read Figure 1-Figure 3As shown, when assembling the magnetic levitation pump 100, the control component 60 and the stator 74 are placed in the fixed space 262 of the second shell 26, the sensor circuit board 642 is adjacent to the opening of the fixed space 262, and the control component 60 is electrically connected to the cable in the cable connecting portion 264; the middle shell 24 is covered on the second shell 26, and the receiving barrel 247 is inserted into the through hole 645 of the sensor circuit board 642 and the inner cavity of the stator 74. At this time, the control component 60 is sleeved in the receiving barrel 247, and the fixed space 262 of the second shell 26 and the installation space 245 of the middle shell 24 form a sealed cavity 28 that can sealably accommodate the control component 60; the base 403 of the impeller 40 is inserted into the receiving barrel 247. , the positioning column 248 of the middle shell 24 is inserted into the rotating hole 405 of the impeller 40, so that the sensor circuit board 642 and the stator 74 are sleeved around the rotor 72; the first shell 23 is covered on the middle shell 24, the first extension rod 234 of the first shell 23 cooperates with the second extension rod 243 of the middle shell 24, and the snap-in edge 236 is snap-fitted into the snap-in groove 249. At this time, the first accommodating space 233 of the first shell 23 and the second accommodating space 242 of the middle shell 24 form an accommodating chamber 27, the impeller 40 and the rotor 72 are suspended in the accommodating chamber 27, and the through groove of the first extension rod 234 and the through groove 244 of the second extension rod 243 form an outlet pipe with a liquid outlet 227 that communicates with the accommodating chamber 27.

[0041] When the magnetic suspension pump 100 is used, after the stator 74 is powered on, the stator coil 745 generates a magnetic field under the action of the current. Under the action of the magnetic field, the impeller 40 and the rotor 72 are suspended in the accommodating chamber 27 and rotate under the action of the magnetic field, that is, the impeller 40 generates centrifugal force and is suspended in the accommodating chamber 27 surrounded by the first shell 23 and the middle shell 24. During the rotation of the impeller 40, the suspended impeller 40 has no mechanical contact with the inner wall of the outer shell 20. The centrifugal force generated by the impeller 40 axially sucks blood from the liquid inlet 226 of the outer shell 20 into the accommodating chamber 27. Then, under the action of the centrifugal force, the blood is discharged from the liquid outlet 227 of the outlet pipe surrounded by the through groove of the first extension rod 234 and the through groove 244 of the second extension rod 243 through the communicating hole 406 and the liquid outlet groove 407. The position and speed of the impeller 40 are precisely adjusted by the control circuit board 62 through the sensor 644 located on the sensor circuit board 642, so that the impeller 40 is in a stable rotation state. Since this magnetic levitation blood pump does not have mechanical wear and frictional heat generation, the mechanical damage to the blood is reduced, and a good blood protection effect is played; and the control component 60 and the stator 74 are integrated into one body and installed in the housing 20, which can reduce the internal space occupied by the housing 20, thereby reducing the overall volume of the magnetic levitation pump 100.

[0042] In other embodiments, the side walls of the accommodating chamber 27 and the receiving barrel 247 are coated with an anti-coagulant material coating, preferably a hydrophilic polymer and / or serum protein, to further reduce the mechanical damage to blood cells and blood formed elements.

[0043] In other embodiments, the outer surface of the impeller 40 is also coated with an anti-coagulant material.

[0044] Please also read Figure 8 and Fig. 9 The structure of the magnetic levitation pump provided in the second embodiment is similar to that of the first embodiment, except that the control assembly 60a in the second embodiment is slightly different from the control assembly 60 in the first embodiment. Specifically, in the second embodiment, the sensor circuit board 642a is provided with a plurality of first notches 646, the positions of the plurality of first notches 646 respectively correspond to the positions of the plurality of stator teeth 743, and a plurality of stator coils 745 are partially accommodated in the plurality of first notches 646. The plurality of first notches 646 are arranged at intervals along the edge of the through hole 645. Specifically, each first notch 646 is connected to the through hole 645. By accommodating a portion of the stator coil 745 in the first notch 646, the length of the control assembly 60a in the axial direction of the impeller 40 is reduced, the volume of the control assembly 60a is reduced, and the internal space occupied by the control assembly 60a in the housing 20 is further reduced.

[0045] A sensor 644 is disposed between each two adjacent first notches 646 of the sensor circuit board 642. A sensor 644 is disposed between each two adjacent stator coils 745. A plurality of sensors 644 and a plurality of stator coils 745 are mutually staggered, so that the sensors 644 are not blocked by the stator coils 745.

[0046] Please also read Fig.10 and Fig.11The structure of the magnetic suspension pump provided in the third embodiment is similar to that of the second embodiment, and a plurality of stator coils 745 are still respectively inserted into the corresponding first notches 646. The difference is that the control assembly 60b in the third embodiment is slightly different from the control assembly 60a in the second embodiment. Specifically, in the third embodiment, the control circuit board 62a is an annular circuit board, that is, a receiving hole 622 is provided in the middle of the control circuit board 62a, and the position of the receiving hole 622 corresponds to the position of the inner hole of the stator yoke 741. The stator coil 745 is partially received in the receiving hole 622. Specifically, the control circuit board 62a is sleeved on the stator 74 through the receiving hole 622. Thereby, the length of the control assembly 60b in the axial direction is further reduced, the volume of the control assembly 60b is reduced, and the internal space occupied by the control assembly 60b in the housing is further reduced. The control circuit board 62a can also be fixedly connected to the stator yoke 741 or directly attached to the side of the stator yoke 741 through a plurality of connecting rods 748. In this embodiment, the sensor circuit board 642a is directly attached to the side of the stator yoke 741.

[0047] See also Fig.12 The structure of the magnetic levitation pump provided in the fourth embodiment is similar to that of the third embodiment, except that the control circuit board 62b in the fourth embodiment is slightly different from the control circuit board 62a in the third embodiment. In the fourth embodiment, the control circuit board 62b is provided with a plurality of second notches 624 corresponding to the plurality of stator coils 745, the positions of the plurality of second notches 624 respectively correspond to the positions of the plurality of stator teeth, and the plurality of stator coils 745 are partially accommodated in the plurality of second notches 624. The plurality of second notches 624 are arranged at intervals along the edge of the receiving hole 622, and each second notch 624 is connected to the receiving hole 622. At this time, the control circuit board 62b can be fixedly connected to the stator yoke 741 by a plurality of connecting rods, or the control circuit board 62b is directly attached to the side of the stator yoke 741. The control circuit board 62b and the sensor circuit board 642a in this embodiment do not occupy the internal space in the axial direction of the housing.

[0048] Please also read Fig.13 and Fig.14The structure of the magnetic suspension pump provided in the fifth embodiment is similar to that of the first embodiment, except that the control assembly 60d in the fifth embodiment is slightly different from the control assembly 60 in the first embodiment. In the fifth embodiment, a receiving hole 622 is provided in the middle of the control circuit board 62c, and the receiving hole 622 is used for inserting the receiving barrel 247 of the middle shell 24. The control circuit board 62c is stacked with the sensor circuit board 642 and is arranged on the same side of the stator yoke 741. There is a gap between the control circuit board 62c and the sensor circuit board 642 and they are electrically connected through a connector 626. The connector 626 includes a plug arranged on the sensor circuit board 642 and a socket arranged on the control circuit board 62c. The plug is plugged into the socket to realize the electrical connection between the sensor circuit board 642 and the control circuit board 62c. In this embodiment, the control circuit board 62c is fixedly connected to the stator yoke 741 through a plurality of connecting rods 748, so as to reduce the length of the control assembly 60d in the axial direction, reduce the volume of the control assembly 60d, that is, reduce the control assembly 60d to occupy the internal space of the shell.

[0049] Please also read Fig.15 and Fig.16 The structure of the magnetic levitation pump provided in the sixth embodiment is similar to that of the third embodiment, except that the control component 60e in the sixth embodiment is slightly different from the control component 60b in the third embodiment. In the sixth embodiment, the control circuit board 62c is stacked with the sensor circuit board 642a and is sleeved on the stator 74. There is a gap between the control circuit board 62c and the sensor circuit board 642a and they are electrically connected through the connector 626. The stator coil 745 of the stator 74 is respectively inserted into the receiving hole 622 and the first notch 646. The control component 60e in this embodiment can reduce the axial length, reduce the volume of the control component 60e, and further reduce the internal space of the housing occupied by the control component 60e.

[0050] In this embodiment, the control circuit board 62c and the sensor circuit board 642a are stacked and sleeved on the stator 74, so that the control circuit board 62c and the sensor circuit board 642a are located between the stator yoke 741 and the partition 246. In other embodiments, the control circuit board 62c and the sensor circuit board 642a are stacked and sleeved on the stator 74, so that the control circuit board 62c and the sensor circuit board 642a are located between the stator yoke 741 and the bottom plate of the second housing 26.

[0051] In other embodiments, the control circuit board 62c has a plurality of notches corresponding to the plurality of stator coils 745, and each notch is connected to the receiving hole 622. When the control circuit board 62c is sleeved on the stator 74, the plurality of stator coils 745 are respectively partially received in the plurality of notches.

[0052] See also Fig.17The structure of the magnetic levitation pump provided in the seventh embodiment is similar to that of the first embodiment, except that the control component 60f provided in the seventh embodiment omits the sensor circuit board, and integrates a plurality of sensors 644 on the control circuit board 62e. Specifically, the control circuit board 62e is a circuit board of an annular structure, that is, a circular through hole 627 is provided in the middle of the control circuit board 62e, and a plurality of sensors 644 are evenly arranged at circumferential intervals along the edge of the through hole 627. The through hole 627 of the control circuit board 62e is used for the insertion of the receiving barrel 247 of the middle shell 24. The control circuit board 62e is connected to one side of the stator yoke 741 through a plurality of connecting rods 748. Since the control component 60f in this embodiment omits the sensor circuit board, the volume of the control component 60f can be further reduced, and the internal space occupied by the control component 60f of the shell can be further reduced.

[0053] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A magnetic levitation pump, characterized in that: The magnetic levitation pump includes an impeller, a control component and a motor, the impeller is rotatable, the control component includes a control circuit board, the motor includes a rotor and a stator, the rotor is fixed to the impeller, the stator includes a stator yoke, stator teeth and a stator coil, the stator teeth are fixed to the stator yoke, the stator coil is installed on the stator teeth, the stator coil is electrically connected to the control circuit board, the control circuit board is fixed to the stator yoke, and the stator is electrically connected to the control circuit board; the magnetic levitation pump also includes a shell, the shell includes a first shell, a middle shell and a second shell, the middle shell is fixed between the first shell and the second shell, and the first shell and the middle shell are jointly surrounded by The second shell and the middle shell are jointly arranged to form a sealed cavity for accommodating the control component and the stator, the accommodating cavity and the sealed cavity are spaced apart, a receiving barrel is formed on the middle shell, the receiving barrel is communicated with the accommodating cavity, the bottom of the receiving barrel extends toward the inside of the sealed cavity, the receiving barrel and the accommodating cavity jointly accommodate the impeller, the rotor is at least partially accommodated in the receiving barrel, the stator yoke is an annular structure, and the receiving barrel is partially accommodated in the inner hole of the stator yoke; wherein, the stator can generate a magnetic field to enable the rotor to suspend and rotate, so that the impeller can suspend and rotate with the rotor, and the control circuit board can control the strength of the magnetic field generated by the stator.

2. The magnetic levitation pump according to claim 1, characterized in that: The control component also includes a sensor component electrically connected to the control circuit board, the sensor component can detect the position of the rotor and can transmit the position data of the rotor to the control circuit board, the sensor component is fixed to the stator yoke, wherein the control circuit board can control the current of the stator coil according to the position data.

3. The magnetic levitation pump according to claim 2, characterized in that: There are a plurality of stator teeth, and the plurality of stator teeth are evenly spaced apart on the inner circumferential wall of the stator yoke along the circumferential direction of the stator yoke. The stator coil is disposed on each of the stator teeth. The sensing component and the stator yoke are disposed along the rotation axis of the rotor. The sensing component is provided with a plurality of first notches, and the positions of the plurality of first notches correspond to the positions of the plurality of stator teeth, respectively. The plurality of stator coils are partially accommodated in the plurality of first notches, respectively.

4. The magnetic levitation pump according to claim 3, characterized in that: The sensing component includes a sensing circuit board electrically connected to the control circuit board and a plurality of sensors arranged on the sensing circuit board, wherein the plurality of sensors are arranged at intervals around the rotor, the sensors are capable of detecting the position of the rotor, and are capable of transmitting the position data of the rotor to the control circuit board through the sensing circuit board, a through hole is provided in the middle of the sensing circuit board, and a plurality of the first notches are arranged at intervals along the edge of the through hole, wherein: The sensor is disposed between every two adjacent first notches; and / or, a plurality of the sensors are disposed on a side of the sensor circuit board facing toward or away from the stator yoke.

5. The magnetic levitation pump according to claim 2, characterized in that: The sensor component has a through hole, and the receiving barrel is penetrated through the through hole.

6. The magnetic levitation pump according to claim 5, characterized in that: There are a plurality of stator teeth, which are evenly spaced apart on the inner circumferential wall of the stator yoke along the circumferential direction of the stator yoke, and each stator tooth is provided with the stator coil. The sensing component is provided with a plurality of first notches which are spaced apart along the edge of the through hole, and the positions of the plurality of first notches respectively correspond to the positions of the plurality of stator coils, wherein the stator coil is partially accommodated in the first notches.

7. The magnetic levitation pump according to claim 2, characterized in that: The control circuit board is provided with a receiving hole, and the receiving barrel is provided with the receiving hole; Alternatively, a receiving hole is provided on the control circuit board, the position of the receiving hole corresponds to the position of the inner hole of the stator yoke, and the stator coil is partially received in the receiving hole.

8. The magnetic levitation pump according to claim 7, characterized in that: The control circuit board is also provided with a plurality of second notches spaced apart along the edge of the receiving hole, and the positions of the plurality of second notches correspond to the positions of the plurality of stator teeth, respectively, wherein the stator coil is partially received in the second notches.

9. The magnetic levitation pump according to any one of claims 2 to 8, characterized in that: The sensor component and the control circuit board are respectively fixedly arranged on two opposite sides of the stator yoke, and the control circuit board is electrically connected to the sensor component through a flexible circuit board; Alternatively, the control circuit board and the sensor component are arranged on the same side of the stator yoke, and the control circuit board and the sensor circuit board of the sensor component are electrically connected via a connector.

10. The magnetic levitation pump according to claim 1, characterized in that: The control circuit board is provided with a receiving hole, and the control circuit board is sleeved on the stator through the receiving hole.

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