CN112807563A - Magnetic suspension pump - Google Patents

Abstract

The invention provides a magnetic suspension pump which comprises an impeller, a control assembly and a motor, wherein the impeller can rotate, the control assembly comprises a control circuit board, the motor comprises a rotor and a stator, the rotor is fixedly connected with the impeller, the stator is fixedly connected with the control circuit board, the stator is electrically connected with the control circuit board, the stator can generate a rotating magnetic field to enable the rotor to suspend and rotate, so that the impeller can suspend and rotate along with the rotor, and the control circuit board can control the magnetic field intensity generated by the stator. The magnetic suspension pump integrates the motor and the controller into a whole, so that the volume of the magnetic suspension pump is reduced, and the reduction of the whole volume of the magnetic suspension pump is facilitated.

Description

Magnetic suspension pump

Technical Field

The invention relates to the technical field of interventional medical instruments, in particular to a magnetic suspension pump.

Background

The morbidity of cardiovascular diseases is on the rising trend year by year, and the mortality of the cardiogenic shock and cardiac function failure which belong to critical patients is extremely high; at present, an apparatus for treating cardiovascular diseases is mainly an artificial ventricle auxiliary device which is mainly a magnetic suspension centrifugal blood pump, a motor coil in a motor is controlled by a motor controller to be electrified, so that the motor coil generates a rotating electromagnetic field to drive a magnetic impeller to rotate, blood is sucked from a liquid inlet of the magnetic suspension centrifugal blood pump, and the blood is discharged from a liquid outlet after passing through the impeller, so that the blood is circulated and flows. However, the motor controller and the motor of the existing magnetic suspension centrifugal blood pump are both arranged inside the shell, but the arrangement is not reasonable, so that the magnetic suspension blood pump has larger volume.

Disclosure of Invention

Based on this, it is necessary to provide a magnetic levitation pump having a small volume.

The utility model provides a magnetic suspension pump, magnetic suspension pump includes impeller, control assembly and motor, the impeller can rotate, control assembly includes control circuit board, the motor includes rotor and stator, the rotor with the impeller rigid coupling, the stator with the control circuit board rigid coupling, just the stator with control circuit board electric connection, wherein, the stator can produce rotating magnetic field so that the rotor can suspend and rotate, so that the impeller can follow the rotor suspends and rotates, control circuit board can control the magnetic field intensity that the stator produced.

The stator of the motor of the magnetic suspension pump is fixedly connected with the control circuit board to integrate the stator of the motor and the controller into a whole, and the impeller is fixedly connected with the rotor to integrate together, so that the occupied space of the motor and the motor controller is favorably reduced, the internal space of the magnetic suspension blood pump is reasonably utilized, the overall volume of the magnetic suspension pump is favorably reduced, and the miniaturization of the magnetic suspension blood pump is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a magnetic levitation pump of a first embodiment;

FIG. 2 is an exploded perspective view of the magnetic levitation pump shown in FIG. 1;

FIG. 3 is a cross-sectional view of the magnetically levitated blood pump shown in FIG. 1;

FIG. 4 is a cross-sectional view of a coupling frame of the magnetic levitation pump shown in FIG. 2;

FIG. 5 is a schematic assembled perspective view of the stator and control assembly of the magnetic suspension pump of FIG. 2;

FIG. 6 is an assembled side view of the stator and control assembly shown in FIG. 5;

FIG. 7 is a schematic perspective view of the control assembly shown in FIG. 5;

FIG. 8 is an assembled structural schematic diagram of a stator and a control assembly of a magnetic levitation pump provided by a second embodiment of the invention;

FIG. 9 is a schematic perspective view of the control assembly shown in FIG. 8;

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;

FIG. 11 is a schematic perspective view of the control assembly shown in FIG. 10;

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;

fig. 13 is an assembled structural schematic view of a stator and a control assembly of a magnetic levitation pump provided by a fifth embodiment of the invention;

FIG. 14 is a schematic perspective view of the control assembly shown in FIG. 13;

fig. 15 is an assembled structural schematic view of a stator and a control assembly of a magnetic levitation pump provided by a sixth embodiment of the invention;

FIG. 16 is a schematic perspective view of the control assembly of FIG. 15;

fig. 17 is a schematic structural view of an assembled stator and control assembly of a magnetic levitation pump according to a seventh embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, the tissue between the left atrium and the right atrium of the present invention is referred to as the interatrial septum, the "proximal" end being the end proximal to the delivery device attachment site, and the "distal" end being the end distal to the delivery device attachment site. Axial refers to the direction of the central axis of the device, and radial is the direction perpendicular to the central axis, and this definition is for convenience only and should not be construed as limiting the invention.

Referring to fig. 1 to 3, a first embodiment of a magnetic levitation pump 100 includes a housing 20, an impeller 40 disposed in the housing 20, a control assembly 60, and a motor 70. The impeller 40 can rotate, the control assembly 60 includes a control circuit board 62, the motor 70 includes a rotor 72 fixedly connected to the impeller 40 and a stator 74 fixedly connected 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 intensity generated by the stator 74. I.e., the control assembly 60, is used to control the operation of the motor 70.

In one embodiment, the magnetic levitation pump 100 is a magnetic levitation ventricular assist centrifugal blood pump, and the magnetic levitation ventricular assist centrifugal blood pump is suitable for treating acute myocardial infarction, severe myocarditis, heart failure caused by the complication of acute cardiogenic shock after cardiac surgery, and the like.

The stator 74 of the magnetic suspension pump 100 of the present invention is integrated with the control assembly 60, which is beneficial to reducing the occupied space of the motor 70 and the control assembly 60 for controlling the motor 70 to work, so that the internal space of the housing 20 is reasonably utilized, the overall volume of the magnetic suspension pump 100 is beneficial to reducing, and the miniaturization of the magnetic suspension blood pump 100 is realized.

As shown in fig. 3, specifically, the housing 20 has a receiving cavity 27 and a sealing cavity 28 which are spaced apart from each other, and the housing 20 is opened with a liquid inlet 21 and a liquid outlet 22 which are communicated with the receiving cavity 27. The control assembly 60 and the stator 74 are both housed within the seal cavity 28. Specifically, in the illustrated embodiment, the outer casing 20 includes a first casing 23, a middle casing 24 and a second casing 26, the middle casing 24 is fixedly connected between the first casing 23 and the second casing 26, the first casing 23 and the middle casing 24 jointly enclose an accommodating cavity 27, and the second casing 26 and the middle casing 24 jointly enclose a sealed cavity 28.

Specifically, the first housing 23 includes an upper cover 231 and an inlet pipe 232 disposed on the upper cover 231, one end of the inlet pipe 232 being fixedly connected to the upper cover 231, the upper cover 231 has a first accommodating space 233 (as shown in fig. 7) communicated with the inlet pipe 232, and the liquid inlet 21 is an opening at an end of the inlet pipe 232 far from the upper cover 231. In this embodiment, the outer peripheral wall of the first casing 23 is protruded with a first extending rod 234, and the first extending rod 234 is provided with a through groove (not shown) extending along the extending direction and communicating with the first accommodating space 233. The edge of the upper cover 231 on the side remote from the inlet pipe 232 is provided with a snap-in edge 236.

Referring to fig. 2 to 4, a contour of one side of the middle shell 24 facing the first shell 23 is similar to a contour of one side of the first shell 23 away from the inlet pipe 232, a second accommodating space 242 is formed in a middle portion of one side of the middle shell 24 facing the first shell 23, the second accommodating space 242 of the middle shell 24 corresponds to and communicates with the first accommodating space 233 of the first shell 23, and the second accommodating space 242 and the first accommodating space 233 together form the accommodating cavity 27 of the housing 20. In this embodiment, the inner diameter of the first accommodating space 242 is equal to the inner diameter of the second accommodating space 242. The outer peripheral wall of the middle shell 24 is convexly provided with a second extension rod 243, the second extension rod 243 is provided with a through groove 244 which extends along the extending direction and is communicated with the second accommodating space 242, the through groove 244 of the middle shell 24 corresponds to and is communicated with the through groove of the first extension rod 234 of the first shell 23 to form an outlet pipe which is communicated with the accommodating cavity 27, and the liquid outlet 22 is one end of the outlet pipe which is far away from the accommodating cavity 27.

The middle shell 24 is formed with a containing barrel 247, the containing barrel 24 is communicated with the containing cavity 27, the bottom of the containing barrel 24 extends towards the inside of the sealed cavity 28, the containing barrel 24 and the containing cavity 27 together contain the impeller 40, and the rotor 72 is at least partially contained in the containing barrel 24. Specifically, in the illustrated embodiment, a mounting space 245 is formed on a side of the middle shell 24 facing away from the first accommodating space 242, a partition 246 is formed between the second accommodating space 242 and the mounting space 245 by the middle shell 24, and a receiving barrel 247 is formed by sinking a middle portion of the partition 246 into the mounting space 245. The cross section of the receiving tub 247 is a circular ring shape. Positioning posts 248 are arranged in the accommodating barrel 247, and the positioning posts 248 are arranged on the rotation axis of the impeller 40 and extend along the rotation axis of the impeller 40. That is, the positioning post 248 is located at the middle of the inner bottom surface of the accommodating barrel 247 and extends into the first accommodating space 242. The middle shell 24 has a clamping groove 249 formed on an edge of a side thereof facing the first shell 23 for engaging with the clamping edge 236.

As shown in fig. 2, the second casing 26 is hermetically connected to the middle casing 24, and a fixing space 262 is opened on a side of the second casing 26 facing the middle casing 24, and the fixing space 262 is communicated with the installation space 245 to jointly form the sealed cavity 28. The outer peripheral wall of the second housing 26 is provided with a connecting portion 264 for connecting a cable, and the cable is electrically connected to the control unit 60 in the sealed cavity 28 through the connecting portion 264. The cable comprises a power line and a signal line.

The impeller 40 is circular in cross-section. One side of the impeller 40 is provided with a base 403, the impeller 40 and the base 403 are of an integral structure, the base 403 is of a hollow annular structure, and the rotor 72 is arranged in the base 403 (as shown in fig. 3). The inner diameter of the rotation hole 405 is larger than the diameter of the positioning post 248 so that the positioning post 248 of the middle housing 24 is inserted into the rotation hole 405. The impeller 40 is provided with a communicating hole 406, the communicating hole 406 extends along the axial lead of the impeller 40 and is communicated with the rotating hole 405, the impeller 40 is also provided with a plurality of liquid outlet grooves 407 which are communicated with the communicating hole 406 and extend along the radial direction of the impeller 40, and the liquid outlet grooves 407 are uniformly arranged at intervals in the circumferential direction of the impeller 40. Specifically, the base 403 is coaxial with the impeller 40. The axis of the rotation hole 405 is collinear with the axis of the communication hole 406. In this embodiment, the rotor 72 is a permanent magnet.

Referring to fig. 2, 5-7, the stator 74 includes a stator yoke 741, a plurality of stator teeth 743 and a plurality of stator coils 745, wherein the plurality of stator teeth 743 are fixed to the stator yoke 741, the plurality of stator coils 745 are respectively mounted on the plurality of stator teeth 743, and the plurality of stator coils 745 are electrically connected to the control circuit board 62. Specifically, in the illustrated embodiment, the stator yoke 741 has a ring-shaped structure, and the stator yoke 741 has two opposing openings 746. The housing tub 247 is partially housed in the stator yoke 741. The plurality of stator coils 745 are provided at intervals on the inner circumferential wall of the stator yoke 741, and the plurality of stator coils 745 are arranged at intervals in the circumferential direction of the inner circumferential wall of the stator yoke 741. Specifically, the plurality of stator teeth 743 are uniformly arranged at intervals in a circle 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 the stator teeth 743 is six, the six stator teeth 743 are in a circumferential annular array along the inner circumferential wall of the stator yoke 741, and an angle between every two adjacent stator teeth 743 is 60 degrees; the number of the stator coils 745 is six, and the six stator coils 745 are respectively sleeved on the six stator teeth 743. It is to 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 desired. Each stator tooth 743 includes a pole portion extending in a radial direction of the stator yoke 741, and a pole shoe disposed at an end of the pole portion away from the stator yoke 741, and each pole portion has a stator coil 745 thereon.

Further, the control assembly 60 further includes a sensing component 64 electrically connected to the control circuit board 62, wherein the sensing component 64 is configured to detect the position of the rotor 72 and transmit the position data of the rotor 72 to the control circuit board 62. The control circuit board 62 can control the current of the stator coil 745 according to the position data. The sensing component 64 and the control circuit board 62 are both fixed to the stator yoke 741. The sensor member 64, the stator yoke 741, and the control circuit board 62 are arranged along the rotational axis of the rotor 72. Specifically, in the illustrated embodiment, the sensor parts 64 and the control circuit board 62 are respectively located on opposite sides of the stator yoke 741, and are respectively disposed opposite to the two openings 746 of the stator yoke 741. The sensor member 64 has a through hole 645, and the housing barrel 247 is inserted through the through hole 645. Specifically, the through hole 645 is substantially circular, and the axis line of the through hole 645 coincides with the rotation axis of the rotor 72.

Specifically, the sensing part 64 includes a sensing circuit board 642 electrically connected to the control circuit board 62, and a sensor 644 disposed on the sensing circuit board 642. The sensor 644 is used to detect the position of the rotor 72, and can transmit position data of the rotor 72 to the control circuit board 62 through the sensor circuit board 642. The sensing circuit board 642 and the control circuit board 62 are respectively fixed to two sides of the stator yoke 741, and are respectively disposed opposite to the two openings 746 of the stator yoke 741. Specifically, the via 645 is located in the middle of the sensing circuit board 642. The sensing circuit board 642 has a circular ring structure. The sensors 644 are several, and several sensors 644 are disposed around the rotor 72. Specifically, several sensors 644 are evenly spaced along the edge of the through-hole 645. The plurality of sensors 644 are position sensors, such as hall sensors, eddy current sensors, and the like. The sensors 644 can be disposed on a side of the sensing circuit board 642 opposite to the control circuit board 62, on a side of the sensing circuit board 642 facing the control circuit board 62, or on two opposite sides of the sensing circuit board 642. In this embodiment, the number of the sensors 644 is six, and the six sensors 644 are arranged at intervals along the edge of the through hole 645, that is, the number of central angles corresponding to arcs between two adjacent sensors 644 is 60 degrees. The number of the sensors 644 is not limited to six, and the number of the sensors 644 may be set as needed.

As shown in fig. 5 and 6, in the present embodiment, the control circuit board 62 and the sensing circuit board 642 are fixedly connected to opposite sides of the stator yoke 741 by the connecting rod 748. More specifically, the control circuit board 62 and the sensor circuit board 642 are opposed to the two openings 746 of the stator yoke 741, respectively. The middle of the connecting rod 748 is fixedly connected to the stator yoke 741, and the sensing circuit board 642 and the control circuit board 62 are fixedly connected to two ends of the connecting rod 748, respectively. In the illustrated embodiment, the connecting rods 748 are several.

As shown in fig. 7, the control circuit board 62 and the sensing circuit board 642 are electrically connected through the flexible circuit board 69, and the flexible circuit board 69 can be bent, so that the control circuit board 62 and the sensing circuit board 642 can be conveniently mounted. Specifically, the control circuit board 62 is a circular plate.

Referring to fig. 1 to fig. 3, when the magnetic levitation pump 100 is assembled, the control assembly 60 and the stator 74 are placed in the fixing space 262 of the second housing 26, the sensing circuit board 642 is adjacent to the opening of the fixing space 262, and the control assembly 60 is electrically connected to the cable in the cable connecting portion 264; covering the middle shell 24 on the second shell 26, and inserting the accommodating barrel 247 into the through hole 645 of the sensing circuit board 642 and the inner cavity of the stator 74, at this time, the control component 60 is sleeved on the accommodating barrel 247, and the fixing space 262 of the second shell 26 and the installation space 245 of the middle shell 24 enclose a sealed cavity 28 capable of hermetically accommodating the control component 60; the base 403 of the impeller 40 is inserted into the accommodating barrel 247, and the positioning column 248 of the middle shell 24 is inserted into the rotating hole 405 of the impeller 40, so that the sensing 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 is matched with the second extension rod 243 of the middle shell 24, the clamping edge 236 is clamped in the clamping 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 enclose an accommodating cavity 27, the impeller 40 and the rotor 72 are suspended in the accommodating cavity 27, and the through groove of the first extension rod 234 and the through groove 244 of the second extension rod 243 enclose an outlet pipe with a liquid outlet 227, which is communicated with the accommodating cavity 27.

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 current, and under the action of the magnetic field, the impeller 40 and the rotor 72 are suspended in the accommodating cavity 27 and rotate under the action of the magnetic field, that is, the impeller 40 generates centrifugal force and is suspended in the accommodating cavity 27 enclosed by the first shell 23 and the middle shell 24. During the rotation of the impeller 40, the suspended impeller 40 does not make any mechanical contact with the inner wall of the casing 20, and the centrifugal attraction generated by the impeller 40 axially sucks blood from the liquid inlet 226 of the casing 20 into the accommodating chamber 27, and then the blood is discharged from the liquid outlet 227 of the outlet pipe enclosed by the through groove of the first extension rod 234 and the through groove 244 of the second extension rod 243 through the communication hole 406 and the liquid outlet groove 407 under the action of the centrifugal force. The position and the rotation speed of the impeller 40 are precisely adjusted by the control circuit board 62 through the sensor 644 on the sensing circuit board 642, so that the impeller 40 is in a stable rotation state. Because the magnetic suspension blood pump does not have mechanical wear and friction heat generation, the mechanical damage to blood is reduced, and a good blood protection effect is achieved; and the control assembly 60 and the stator 74 are integrated and then installed in the housing 20, so that the occupied inner space of the housing 20 can be reduced, and the overall volume of the magnetic suspension pump 100 can be reduced.

In other embodiments, the side walls of the holding chamber 27 and holding barrel 247 are coated with a coating of anticoagulant material, preferably hydrophilic polymers and/or serum proteins, to further reduce mechanical damage to blood cells and blood-forming components.

In other embodiments, the outer surface of the impeller 40 is also coated with a coating of anticoagulant material.

Referring to fig. 8 and 9, the structure of the magnetic suspension pump provided by 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 sensing circuit board 642a is formed with a plurality of first notches 646, the positions of the plurality of first notches 646 correspond to the positions of the plurality of stator teeth 743, respectively, and the plurality of stator coils 745 are partially received in the plurality of first notches 646. A plurality of first notches 646 are spaced along the edge of the through-hole 645. Specifically, each first notch 646 communicates with a through hole 645. By partially housing the stator coil 745 in the first notch 646, the length of the control unit 60a in the axial direction of the impeller 40 is reduced, the volume of the control unit 60a is reduced, and the space occupied by the control unit 60a in the casing 20 is further reduced.

A sensor 644 is disposed between each adjacent two first notches 646 of the sensing circuit board 642. A sensor 644 is disposed between each adjacent two stator coils 745, and the plurality of sensors 644 and the plurality of stator coils 745 are offset from each other, so that the sensors 644 are not shielded by the stator coils 745.

Referring to fig. 10 and 11 together, the structure of the magnetic levitation pump provided by the third embodiment is similar to that of the second embodiment, and the stator coils 745 are still inserted into the corresponding first notches 646, respectively, except 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 a ring-shaped circuit board, that is, the middle portion of the control circuit board 62a is opened with the receiving hole 622, the position of the receiving hole 622 corresponds to the position of the inner hole of the stator yoke 741, and 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 further reducing the length of the control assembly 60b in the axial direction, reducing the volume of the control assembly 60b, and further reducing the space occupied by the control assembly 60 b. The control circuit board 62a may also be fixedly connected to the stator yoke 741 via a plurality of connecting rods 748 or directly attached to the side surface of the stator yoke 741, and in this embodiment, the sensing circuit board 642a is directly attached to the side surface of the stator yoke 741.

Referring to fig. 12, the magnetic levitation pump provided in the fourth embodiment has a structure 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 defines a plurality of second notches 624 corresponding to the plurality of stator coils 745, the positions of the plurality of second notches 624 correspond to the positions of the plurality of stator teeth, respectively, and the plurality of stator coils 745 are partially received in the plurality of second notches 624. The second notches 624 are spaced 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 may be fixedly connected to the stator yoke 741 by a plurality of connecting rods or the control circuit board 62b is directly attached to a side surface of the stator yoke 741. The control circuit board 62b and the sensing circuit board 642a in this embodiment do not occupy the inner space of the housing in the axial direction.

Referring to fig. 13 and 14, a magnetic levitation pump according to a fifth embodiment is similar to 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, the control circuit board 62c has a receiving hole 622 formed in the middle thereof, and the receiving hole 622 is used for inserting the receiving barrel 247 of the middle shell 24. The control circuit board 62c and the sensing circuit board 642 are stacked and disposed on the same side of the stator yoke 741, and a gap is formed between the control circuit board 62c and the sensing circuit board 642 and electrically connected through the connector 626. The connector 626 includes a plug disposed on the sensing circuit board 642 and a socket disposed on the control circuit board 62c, wherein the plug is plugged into the socket to electrically connect the sensing circuit board 642 and the control circuit board 62 c. In this embodiment, the control circuit board 62c is fixedly connected to the stator yoke 741 via 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, and reduce the internal space occupied by the control assembly 60 d.

Referring to fig. 15 and 16 together, the structure of the magnetic suspension pump provided by the sixth embodiment is similar to that of the third embodiment, except that: the control unit 60e in the sixth embodiment is slightly different from the control unit 60b in the third embodiment. In the sixth embodiment, the control circuit board 62c and the sensing circuit board 642a are stacked and sleeved on the stator 74, the control circuit board 62c and the sensing circuit board 642a are spaced apart and electrically connected by the connector 626, and the stator coil 745 of the stator 74 is inserted into the receiving hole 622 and the first notch 646 respectively. The control assembly 60e in this embodiment can reduce the axial length, so that the volume of the control assembly 60e is reduced, and the internal space occupied by the control assembly 60e in the housing is further reduced.

In this embodiment, the control circuit board 62c and the sensing circuit board 642a are stacked and sleeved on the stator 74, such that the control circuit board 62c and the sensing circuit board 642a are located between the stator yoke 741 and the partition 246. In other embodiments, the control circuit board 62c and the sensing circuit board 642a are stacked and can be sleeved on the stator 74, such that the control circuit board 62c and the sensing circuit board 642a are located between the stator yoke 741 and the bottom plate of the second housing 26.

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

Referring to fig. 17, a magnetic levitation pump provided in a seventh embodiment has a structure similar to that of the first embodiment, except that: the seventh embodiment provides the control unit 60f with the sensor circuit board omitted and the sensors 644 integrated on the control circuit board 62 e. Specifically, the control circuit board 62e is a circuit board with an annular structure, that is, a circular through hole 627 is formed in the middle of the control circuit board 62e, and the plurality of sensors 644 are uniformly arranged at intervals along the edge of the through hole 627. The through hole 627 of the control circuit board 62e is used for insertion of the accommodating barrel 247 of the middle case 24. The control circuit board 62e is connected to one side of the stator yoke 741 by a plurality of connecting rods 748. In the control assembly 60f of the embodiment, the sensing circuit board is omitted, so that the volume of the control assembly 60f can be further reduced, and the internal space of the housing occupied by the control assembly 60f can be further reduced.

The foregoing is illustrative of embodiments of the present invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the embodiments of the present invention and are intended to be within the scope of the present invention.

Claims (10)

1. The utility model provides a magnetic suspension pump, its characterized in that, magnetic suspension pump includes impeller, control assembly and motor, the impeller can rotate, control assembly includes control circuit board, the motor includes rotor and stator, the rotor with the impeller rigid coupling, the stator with control circuit board rigid coupling, just the stator with control circuit board electric connection, wherein, the stator can produce magnetic field so that the rotor can suspend and rotate, so that the impeller can follow the rotor suspends and rotates, control circuit board can control the magnetic field intensity that the stator produced.

2. The pump of claim 1, wherein the stator includes a stator yoke, stator teeth, and stator coils, the stator teeth are fixed to the stator yoke, the stator coils are mounted on the stator teeth, the stator coils are electrically connected to the control circuit board, the control assembly further includes a sensing component electrically connected to the control circuit board, the sensing component is capable of detecting the position of the rotor and transmitting the position data of the rotor to the control circuit board, the sensing component and the control circuit board are both fixed to the stator yoke, and the control circuit board is capable of controlling the current of the stator coils according to the position data.

3. The pump of claim 2, wherein the stator yoke is annular, the number of stator teeth is plural, the plural stator teeth are uniformly spaced along a circumferential direction of the stator yoke on an inner circumferential wall of the stator yoke, the stator coil is provided on each of the stator teeth, the sensing member and the stator yoke are provided along a rotational axis of the rotor, the sensing member is provided with plural first notches, positions of the plural first notches correspond to positions of the plural stator teeth, respectively, and the plural stator coils are partially accommodated in the plural first notches, respectively.

4. The maglev pump of claim 3, wherein the sensing component comprises a sensing circuit board electrically connected to the control circuit board and a plurality of sensors disposed on the sensing circuit board, the plurality of sensors are spaced around the rotor, the sensors are capable of detecting the position of the rotor and transmitting the position data of the rotor to the control circuit board through the sensing circuit board, a through hole is formed in the middle of the sensing circuit board, and a plurality of first notches are spaced along the edge of the through hole, wherein:

the sensor is arranged between every two adjacent first gaps; and/or the sensors are all arranged on one side of the sensing circuit board facing to or facing away from the stator yoke.

5. The maglev pump of claim 2, further comprising an outer casing, wherein the outer casing comprises a first casing, a middle casing and a second casing, the middle casing is fixedly connected between the first casing and the second casing, the first casing and the middle casing jointly enclose an accommodating cavity, the second casing and the middle casing jointly enclose a sealed cavity for accommodating the control component and the stator, a containing barrel is formed on the middle casing, the containing barrel is communicated with the accommodating cavity, the bottom of the containing barrel extends towards the inside of the sealed cavity, the containing barrel and the accommodating cavity jointly accommodate the impeller, and the rotor is at least partially accommodated in the containing barrel;

the stator yoke is of an annular structure, the sensing component is provided with a through hole, and the accommodating barrel penetrates through the through hole and is partially accommodated in an inner hole of the stator yoke.

6. The pump of claim 5, wherein the number of the stator teeth is a plurality of the stator teeth, the plurality of the stator teeth are uniformly spaced along the circumferential direction of the stator yoke on the inner circumferential wall of the stator yoke, the stator coil is disposed on each of the stator teeth, the sensing part is formed with a plurality of first notches spaced along the edge of the through hole, the plurality of the first notches correspond to the plurality of the stator coils, and the stator coils are partially received in the first notches.

7. The pump of claim 5, wherein the control circuit board is provided with an accommodating hole, and the accommodating barrel penetrates through the accommodating hole;

or, the control circuit board is provided with an accommodating hole, the position of the accommodating hole corresponds to the position of the inner hole of the stator yoke, and the stator coil part is accommodated in the accommodating hole.

8. The pump of claim 7, wherein the control circuit board further defines a plurality of second notches spaced apart along an edge of the receiving hole, the second notches corresponding to the stator teeth, and the stator coil is partially received in the second notches.

9. The pump of any one of claims 2 to 8, wherein the sensing component and the control circuit board are respectively and fixedly arranged on two opposite sides of the stator yoke, and the control circuit board is electrically connected with the sensing component through a flexible circuit board;

or the control circuit board and the sensing component are arranged on the same side of the stator yoke, and the control circuit board is electrically connected with the sensing circuit board through a connector.

10. The pump of claim 1, wherein the control circuit board has a receiving hole, and the control circuit board is disposed on the stator through the receiving hole.

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