CN219398710U - Driving device for magnetic mixing blood pump - Google Patents

Abstract

The utility model discloses a driving device for a magnetic mixing blood pump, which comprises a casing, a rotor assembly and a motor rotor assembly, wherein a first cavity and a second cavity are arranged on the casing, the first cavity is positioned above the second cavity, the rotor assembly is automatically centered and suspended in the first cavity, a plurality of groups of rotor magnetic steels are arranged in the rotor assembly and uniformly distributed on a circumference, the motor stator assembly comprises an annular second stator core, the second stator core is arranged at the bottom of the cavity of the second cavity, a raised second magnetic pole is arranged on the end surface of the second stator core, which is far away from the first cavity, a second coil is arranged on the second magnetic pole, an insulating layer is arranged between the second coil and the second magnetic pole, and the circumference of the second magnetic pole is positioned in a rotor magnetic steel movement track on an axial projection surface. The beneficial effects of the utility model are as follows: the rotor assembly is rotated, and the space of the casing is effectively utilized, so that the volume of the magnetic mixing blood pump is reduced.

Description

Driving device for magnetic mixing blood pump

Technical Field

The utility model relates to an implantable heart assist device, in particular to a driving device for a mixed magnetic blood pump.

Background

The use of implantable heart assist devices to achieve long-term circulatory support has become an effective method of treating advanced heart failure clinically. The "continuous bleeding pump" which has been rapidly developed in recent years is relatively suitable for long-term in vivo implantation. The continuous bleeding pump mainly comprises an axial flow pump and a centrifugal pump, and both the axial flow pump and the centrifugal pump adopt impellers rotating at high speed to drive blood to flow. The traditional impeller supporting system is a mechanical bearing, can limit the movement of the rotating impeller in the radial direction and the axial direction at the same time, and has high rigidity and compact structure. The mechanical bearings have the disadvantage that the mutually sliding contact surfaces during operation generate friction, wear and local temperature increases, creating areas of blood retention and thrombus attachment around the bearing. The impellers of the third generation implantable heart assist devices are supported by suspension bearings, such as the "HeartMate 3" and "HeartWare HVAD" centrifugal pumps currently in common use in the United states. However, blood pumps for long-term use implanted in the body are required to overcome some important drawbacks, such as: thromboembolism, hemorrhage, infection, abrasion of blood pump, and destruction of blood components. The five-degree-of-freedom full-suspension volume of the magnetic force control rotating impeller is larger, so that the implantation of patients with smaller stature is difficult, and the magnetic force control rotating impeller is not suitable for Asian species and children.

Because the implantable heart assist device is needed to be implanted in a human body, the volume is small, and under the condition of small volume, the space utilization rate of the implantable heart assist device is required, and the inventor performs long-term research on the implantable heart assist device, develops a hybrid magnetic blood pump with low energy consumption and stable operation, and adjusts the position of the driving device, so that the space utilization rate of the hybrid magnetic blood pump is improved, and the volume can be implanted in the human body.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a driving device for a magnetic mixing blood pump.

The aim of the utility model is achieved by the following technical scheme: the driving device for the magnetic mixing blood pump comprises a shell, a rotor assembly and a motor stator assembly, wherein a first cavity and a second cavity are arranged on the shell, the first cavity is positioned above the second cavity, the rotor assembly automatically and centrally floats in the first cavity, a plurality of groups of rotor magnetic steels are arranged in the rotor assembly and uniformly distributed on a circumference, the motor stator assembly comprises an annular second stator core, the second stator core is arranged at the bottom of the cavity of the second cavity, a raised second magnetic pole is arranged on the end face of the second stator core, far away from the first cavity, a second coil is arranged on the second magnetic pole, an insulating layer is arranged between the second coil and the second magnetic pole, the circumference of the second magnetic pole is positioned in a rotor magnetic steel movement track on an axial projection surface, the second magnetic pole is eight, so the second coil is also eight, after the second coil is electrified, the second coil can generate pulling force to the rotor magnetic steel, so that the rotor magnetic steel circumferentially rotates, and further, the rotor assembly circumferentially rotates.

Further, the middle part of the second cavity is recessed towards the first cavity to form a convex column, the convex column penetrates through the first cavity, a first permanent magnet is fixedly arranged in an inner cavity of the convex column, a circular second permanent magnet is arranged on the rotor assembly, axial leads of the first permanent magnet and the second permanent magnet are coincident, the circumferential diameter of the second permanent magnet is smaller than that of the rotor magnetic steel, the first permanent magnet and the second permanent magnet are commercially available products, when the first permanent magnet and the second permanent magnet are selected, the attractive force between the first permanent magnet and the second permanent magnet can overcome the gravity of the rotor assembly price, so that the rotor assembly can suspend in the first cavity under the action of magnetic force of the first permanent magnet and the second permanent magnet, and because the axial leads of the first permanent magnet and the second permanent magnet are coincident, the circumferential stress of the rotor assembly is uniform under the action of no external force, and the rotor assembly can be automatically centered under the action of the attractive force of the first permanent magnet and the second permanent magnet.

Further, the cavity of the second cavity is provided with a downward protruding convex ring, a first magnetism isolating sleeve is sleeved on the convex ring, and the first magnetism isolating sleeve is positioned in the inner ring of the second stator core.

Further, the insulating layer is insulating paint.

Further, the number of the rotor magnetic steels is four, and two opposite rotor magnetic steels are a group.

Further, the first permanent magnet and the second permanent magnet are multiple and are arranged in a lamination mode.

Further, a second magnetism isolating sleeve is also installed on the rotor assembly, and the second magnetism isolating sleeve is located between the second permanent magnet and the rotor magnetic steel.

The utility model has the following advantages: the driving device for the magnetic mixing blood pump realizes the rotation of the rotor assembly, effectively utilizes the space of the shell and reduces the volume of the magnetic mixing blood pump.

Drawings

FIG. 1 is a schematic diagram of a magnetic mixing blood pump;

FIG. 2 is a schematic cross-sectional view of a magnetic-hybrid blood pump;

FIG. 3 is a schematic illustration of the installation of a rotor assembly, a magnetic bearing assembly, and a motor stator assembly within a housing;

FIG. 4 is a second schematic illustration of the installation of the rotor assembly, magnetic bearing assembly, and motor stator assembly within the housing;

FIG. 5 is a schematic sectional view of the rotor assembly, magnetic bearing assembly, and motor stator assembly installed within a housing;

FIG. 6 is a schematic structural view of a rotor assembly;

FIG. 7 is a schematic cross-sectional view of a rotor assembly;

FIG. 8 is a schematic structural view of a rotor housing;

FIG. 9 is a schematic view of an assembly of a support ring and a cover plate;

FIG. 10 is a schematic view of an open position of an annular cavity and a magnetic steel mounting cavity in a rotor assembly;

FIG. 11 is a schematic structural view of a magnetic bearing assembly;

FIG. 12 is a schematic structural view of a motor stator assembly;

FIG. 13 is a schematic cross-sectional view of a motor stator assembly;

FIG. 14 is a schematic diagram of a housing;

FIG. 15 is a second schematic structural view of the housing;

FIG. 16 is a schematic view of the installation of a first permanent magnet;

FIG. 17 is a schematic cross-sectional view of a rotor assembly;

in the figure, 10-sealing cover, 20-volute, 30-liquid inlet pipe, 40-liquid outlet pipe, 100-casing, 200-rotor component, 300-magnetic bearing component, 400-motor stator component, 101-first cavity, 102-boss, 103-blind hole, 104-first permanent magnet, 105-cushion, 106-magnetism isolating piece, 107-fixing piece, 108-sensor, 109-convex ring, 110-first magnetism isolating sleeve, 111-second cavity, 112-first annular groove, 201-rotor shell, 202-impeller, 203-central through hole, 204-second annular groove, 205-cover plate, 206-second permanent magnet, 207-second magnetism isolating sleeve, 208-rotor, 209-supporting ring, 210-fixing groove, 211-annular cavity, 212-magnetic steel installation cavity, 213-first runner, 214-second runner, 301-first stator core, 302-first magnetic pole, 303-first coil, 401-second stator core, 402-second magnetic pole, 403-second coil.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present utility model and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 3, 4 and 5, a driving device for a magnetic mixing blood pump comprises a casing 100, a rotor assembly 200 and a motor stator assembly 400, wherein a first cavity 101 and a second cavity 111 are arranged on the casing 100, the first cavity 101 is positioned above the second cavity 111, the rotor assembly 200 is automatically centered and suspended in the first cavity 101, a plurality of groups of rotor magnetic steels 208 are arranged in the rotor assembly 200, the plurality of groups of rotor magnetic steels 208 are uniformly distributed on a circumference, preferably, the number of the rotor magnetic steels 208 is four, and two opposite rotor magnetic steels 208 are in a group, the motor stator assembly comprises an annular second stator core 401, the second stator core 401 is arranged at the bottom of the second cavity 111, a convex second magnetic pole 402 is arranged on the end surface of the second stator core 401 far away from the first cavity 101, a second coil 403 is arranged on the second magnetic pole 402, an insulating layer is arranged between the second coil 403 and the second magnetic pole 402, preferably, the insulating layer is insulating paint, on the axial projection surface, the circumference of the second magnetic pole 402 is located in the motion track of the rotor magnetic steel 208, the number of the second magnetic poles 402 is eight, so that the number of the second coils 403 is eight, when the second coils 403 are electrified, the second coils 403 generate tensile force on the rotor magnetic steel 208, so that the rotor magnetic steel 208 rotates circumferentially, and the rotor assembly 200 rotates circumferentially, because the rotor assembly 200 is suspended in the first cavity 101, the electronic stator assembly can easily drive the rotor assembly 200 to rotate, the width of the second magnetic pole 402 in the radial direction is the same as the width of the rotor magnetic steel 208, the circumference of the second magnetic pole 402 coincides with the circumference of the rotor magnetic steel 208 in the axial projection, the motor stator assembly is arranged below the rotor assembly 200, so that the volume of the magnetic mixing pump is effectively utilized, the volume of the magnetic mixing blood pump can be reduced.

Further, as shown in fig. 14, 15 and 16, the middle part of the second cavity 111 is recessed towards the direction of the first cavity 101 to form a convex column 102, the convex column 102 passes through the first cavity 101, a first permanent magnet 104 is fixedly installed in an inner cavity of the convex column 102, a circular second permanent magnet 206 is installed on the rotor assembly 200, axial leads of the first permanent magnet 104 and the second permanent magnet 206 are coincident, the circumferential diameter of the second permanent magnet 206 is smaller than that of the rotor magnetic steel 208, the first permanent magnet 104 and the second permanent magnet 206 are all commercially available products, when the first permanent magnet 104 and the second permanent magnet 206 are selected, the attractive force between the first permanent magnet 104 and the second permanent magnet 206 can overcome the gravity of the rotor assembly price, so that the rotor assembly 200 can be suspended in the first cavity 101 under the magnetic force action of the first permanent magnet 104 and the second permanent magnet 206, and the circumferential force of the rotor assembly 200 is uniform under the action of the permanent magnet 104 and the second permanent magnet 206 under the action of no external force, and the rotor assembly 200 can be automatically centered under the action of the first permanent magnet 104 and the second permanent magnet 206.

In this embodiment, the cavity of the second cavity 111 is provided with a downward protruding convex ring 109, the convex ring 109 is sleeved with a first magnetism isolating sleeve 110, the first magnetism isolating sleeve 110 is located in the inner ring of the second stator core 401, and the first magnetism isolating sleeve 110 can avoid the influence of the magnetic field generated by the second coil 403 on the sensor, so that the stability of magnetic force detection of the sensor on the second permanent magnet 206 is ensured.

In this embodiment, the first permanent magnet 104 and the second permanent magnet 206 are multiple and are stacked, and after the first permanent magnet 104 and the second permanent magnet 206 are stacked, the magnetic force stability of the first permanent magnet 104 and the second permanent magnet 206 can be ensured, so that the magnetic force stability between the first permanent magnet 104 and the second permanent magnet 206 is ensured.

In this embodiment, the rotor assembly 200 is further provided with a second magnetism isolating sleeve 207, the second magnetism isolating sleeve 207 is located between the second permanent magnet 206 and the rotor magnetic steel 208, and the second permanent magnet 206 can avoid the magnetic force influence of the second permanent magnet 206 on the rotor magnetic steel 208.

The driving device of the present utility model is mainly used for a magnetic mixing blood pump, and the driving device will be described in detail below with reference to the magnetic mixing blood pump.

As shown in fig. 1 and 2, a magnetic mixing blood pump includes a casing 100 and a rotor assembly 200, as shown in fig. 1 and 2, a volute 20 is installed at one end of the casing 100, a liquid inlet nozzle 30 and a liquid outlet nozzle 40 are provided on the volute 20, a volute cavity is provided in the volute 20, in this embodiment, the liquid inlet nozzle 30 is vertically arranged, and the liquid outlet nozzle 40 is arranged along a tangential direction of the volute 20, so that blood can be smoothly discharged from the liquid outlet nozzle 40 in the volute cavity.

In this embodiment, as shown in fig. 1 and 2, the other end of the casing 100 is sealed by the sealing cap 10, so that blood can be discharged only from the outlet port 40 after entering from the inlet port 30.

In the present embodiment, as shown in fig. 14 and 15, the end face of the casing 100 near the scroll casing 20 is recessed toward the seal cover 10 and forms a first cavity 101, the end face of the casing 100 near the seal cover 10 is recessed toward the scroll casing 20 and forms a second cavity 111, in the present embodiment, in the direction of the scroll casing 20, the direction of the seal cover 10 is downward, in the present embodiment, the bottom edge of the second cavity 111 continues to be recessed toward the direction of the scroll casing 20 and forms a first annular groove 112, as shown in fig. 16, the middle part of the second cavity 111 continues to be recessed toward the direction of the scroll casing 20 and forms a boss 102, the boss 102 passes through the first cavity 101, a first permanent magnet 104 is fixedly installed in the inner cavity of the boss 102, in the present embodiment, the scroll casing 20 is integrally formed, can be processed by casting, in the present embodiment, the scroll casing 20 is in a revolution body structure, therefore, the spiral case 20 can also be manufactured by machining, when the spiral case 20 is machined, the upper end of the spiral case 20 is provided with a first cavity 101, the lower end of the spiral case 20 is provided with a second cavity 111, the first cavity 101 and the second cavity 111 are separated by a partition board, the center of the first cavity 101 is provided with a convex column 102, the convex column 102 is a circular column, the center of the bottom of the second cavity 111 is provided with a blind hole 103 upwards, the blind hole 103 is positioned in the convex column 102, the blind hole 103 forms an inner cavity of the convex column 102, further, the upper end of the convex column 102 is in a semi-spherical structure, the upper end of the convex column 102 is positioned outside the first cavity 101, namely, the upper end of the convex column 102 is positioned in the spiral cavity, the upper end of the convex column 102 is provided as a semi-spherical head, the convex column 102 and the liquid inlet pipe 30 are coaxially arranged, when blood enters into the spiral cavity through the liquid inlet pipe 30, the upper end of the boss 102 of the bulb will uniformly disperse blood within the volute.

In this embodiment, the rotor assembly 200 has a central through hole 203, the boss 102 passes through the central through hole 203, the central through hole 203 is a round hole, the gap between the boss 102 and the central through hole 203 forms a first flow channel 213, the rotor assembly 200 is provided with a circular second permanent magnet 206 and a plurality of pairs of rotor magnet steels 208, the rotor magnet steels 208 are uniformly distributed on the same circumference, and the magnetic poles of adjacent rotor magnet steels 208 are opposite, the diameter of the circumference of the second permanent magnet 206 is smaller than the diameter of the circumference of the rotor magnet steel 208, therefore, the second permanent magnet 206 is installed inside the rotor magnet steel 208, in this embodiment, as shown in fig. 6, 7 and 8, the rotor assembly 200 includes a rotor housing 201, a cover plate 205 and a supporting ring 209, the rotor housing 201 is cylindrical, the central hole of the rotor housing 201 is the central through hole 203, and the end face of the rotor housing 201 near the volute 20 is provided with an impeller 202, the impeller 202 is located in the volute cavity, a second annular groove 204 is formed on the end surface of the rotor housing 201, which is close to the sealing cover 10, towards the direction of the volute 20, a thin-wall structure is formed between the second annular groove 204 and the central through hole 203, a supporting ring 209 is installed in the second annular groove 204, the supporting ring 209 is tightly pressed by a cover plate 205 installed on the rotor housing 201, an annular cavity 211 is formed between the inner side wall of the supporting ring 209 and the inner annular wall of the second annular groove 204, a second permanent magnet 206 is fixedly installed in the annular cavity 211, a plurality of fixing grooves 210 are formed on the supporting ring 209, rotor magnetic steel 208 is installed in the fixing grooves 210, the plurality of fixing grooves 210 are uniformly distributed on the same circumference, the circumference diameter of the fixing grooves 210 is larger than that of the second permanent magnet 206, preferably, the fixing grooves 210 are formed at the outer edge of the supporting ring 209, and the projection of the fixing grooves 210 in the axial direction is in a fan shape, when the support ring 209, the rotor housing 201 and the cover plate 205 are assembled, the magnet steel installation cavity 212 and the annular cavity 211 are formed in the rotor assembly 200, and the size of the rotor magnet steel 208 is matched with the size of the magnet steel installation cavity 212, so that when the rotor assembly 200 is assembled, as shown in fig. 17, the rotor magnet steel 208 is fixedly installed in the magnet steel installation cavity 212, and the cross section of the rotor magnet steel 208 is fan-shaped, in this embodiment, the support ring 209 and the cover plate 205 are integrally structured, so that when the rotor magnet steel 208 and the second permanent magnet 206 are installed on the support ring 209, only the rotor assembly 200 and the cover plate 205 need to be covered, as shown in fig. 9, the support ring 209 and the cover plate 205 are integrally arranged, and in other embodiments, the support ring 209 and the rotor housing 201 can also be integrally arranged, in this embodiment, the cover plate 205 is circular, and when the cover plate 205 and the rotor housing 201 are assembled, the outer circular side wall of the cover plate 205 is fixedly attached to the outer circular side wall of the second ring 204, and the inner circular side wall of the cover plate 205 is attached to the inner circular side wall of the inner circular ring 205, and the diameter of the inner circular ring 205 is larger than the annular groove 209.

In this embodiment, since the first permanent magnet 104 is installed in the boss 102 and the second permanent magnet 206 is installed on the rotor assembly 200, the rotor assembly 200 is suspended in the first cavity 101 under the action of the magnetic attraction force of the first permanent magnet 104 and the second permanent magnet 206, in this embodiment, the first permanent magnet 104 is cylindrical, the second permanent magnet 206 is annular, and the coaxiality of the first permanent magnet 104 and the second permanent magnet 206 needs to be ensured when the first permanent magnet 104 and the second permanent magnet 206 are designed, so that after the rotor assembly 200 is placed in the first cavity 101, the rotor assembly 200 is suspended in the first cavity 101 under the action of the magnetic force of the first permanent magnet 104 and the second permanent magnet 206, and the coaxiality of the center through hole 203 and the boss 102 can also be ensured, even if the axial lead of the center through hole 203 is placed away from the central line of the boss 102, the rotor assembly 200 is automatically centered under the action of the magnetic force of the first permanent magnet 104 and the second permanent magnet 206, so that the center through hole 203 coincides with the central lead of the boss 102.

In this embodiment, after the first permanent magnet 104 is installed, the first permanent magnet 104 is located in the first cavity 101, in order to ensure that the first permanent magnet 104 is installed, a cushion block 105 is further installed at the bottom of the cavity of the inner cavity of the convex column 102, the first permanent magnet 104 is abutted against the cushion block 105, and the axial position of the first permanent magnet 104 can be adjusted through the thickness of the cushion block 105, so that the first permanent magnet 104 is ensured to be in the first cavity 101, and the first permanent magnet 104 and the second permanent magnet 206 are ensured to correspond to each other.

In this embodiment, as shown in fig. 3, 4 and 5, after the rotor assembly 200 is automatically centered and suspended in the first cavity 101, a gap is formed between the outer side wall of the rotor assembly 200 and the cavity wall of the first cavity 101, and the gap forms the second flow channel 214, because the rotor assembly 200 is suspended in the first cavity 101, the first flow channel 213 and the second flow channel 214 can be communicated through the cavity bottom of the first cavity 101, and the upper side of the first flow channel 213 is communicated with the volute cavity, and the upper side of the second flow channel 214 is communicated with the volute cavity, so that a circulation channel is formed between the first flow channel 213, the second flow channel 214, the volute cavity and the cavity bottom of the first cavity 101, and when the rotor rotates at a high speed, the pressure of the first flow channel 213 is smaller than the pressure in the second flow channel 214, so that blood in the second flow channel 214 flows towards the first flow channel 213 and enters the volute cavity from the first flow channel 213, and finally flows away through the liquid outlet orifice 40, and thus the magnetic pump is not generated, and the magnetic pump is prevented from being dead by the magnetic pump, and the magnetic pump is further connected with the first cavity 101, and the arc-shaped cavity is further avoided.

In this embodiment, as shown in fig. 16, a sensor 108 for detecting the magnetic force change of the second permanent magnet 206 is also fixedly installed in the inner cavity of the boss 102, the sensor 108 is located between the first permanent magnet 104 and the sealing cover 10, and if the sensor 108 detects the magnetic force change of the second permanent magnet 206, the rotation state of the rotor assembly 200 can be determined, and the sensor 108 is a hall sensor 108 and is a commercially available product;

in this embodiment, as shown in fig. 5, the magnetic bearing assembly 300 for righting the rotor assembly 200 is installed in the first annular groove 112, when the rotor assembly 200 works, the rotor assembly 200 is contained in flowing blood, and the blood entering from the liquid inlet pipe orifice 30 also has a certain impact on the rotor assembly 200, so that when the rotor assembly 200 works, the rotor assembly 200 may be deflected under the flowing of fluid, after the rotor assembly 200 deflects, the positions of the second permanent magnet 206 and the sensor 108 are also changed relatively, so that the magnetic force of the second permanent magnet 206 at the sensor 108 is changed, and after the sensor 108 detects the magnetic force change of the second permanent magnet 206, the sensor 108 transmits the magnetic force to the controller of the magnetic mixing blood pump, and the controller controls the magnetic bearing assembly 300 to adjust the magnetic force, so as to change the magnetic force of the magnetic bearing assembly 300 in a certain direction or directions of the rotor assembly 200, thereby the rotor assembly 200 is righted, and the collision between the rotor assembly 200 and other components is avoided, so that the magnetic mixing stability of the blood pump is ensured.

In this embodiment, as shown in fig. 11, the magnetic bearing assembly 300 includes an annular first stator core 301, a first magnetic pole 302 protruding radially inwards is disposed on an inner ring of the first stator core 301, an inner side wall of the first magnetic pole 302 is an arc side wall, a circumference where the inner side wall of the first magnetic pole 302 is located is coaxially disposed with a circumference where the rotor magnetic steel 208 is located, a first coil 303 is mounted on the first magnetic pole 302, an insulating layer is disposed between the first coil 303 and the first magnetic pole 302, the stator core is attached to an outer ring side wall of the first annular groove 112, an inner side wall of the first magnetic pole 302 is attached to an inner ring side wall of the first annular groove 112, so that installation of the magnetic bearing assembly 300 in the first annular groove 112 is realized, preferably, the insulating layer is an insulating paint, further, the number of the first magnetic poles 302 is a positive integer multiple of the number of the rotor magnetic steels 208, if the rotor magnetic steels 208 are two groups, i.e. the number of the rotor magnetic steels 208 is four, the number of the first magnetic poles 302 is a positive integer number of four, for example, the number of the first magnetic poles 302 is four, eight or twelve, that is, the number of the first coils 303 is four, eight or twelve, and the rotor magnetic steels 208 need to correspond to the corresponding first coils 303, because in this embodiment, when the rotor assembly 200 is not deflected, the magnetic field generated by the first coils 303 is the same as the attractive force or the repulsive force to the corresponding rotor magnetic steels 208, and because the magnetic poles of the adjacent rotor magnetic steels 208 are opposite, the rotor magnetic steels 208 are rotated in the circumferential direction, the positions of the first coils 303 are fixed, so that the magnetic field direction of the first coils 303 needs to be changed continuously during the rotation of the rotor magnetic steels 208, thereby realizing that the magnetic field generated by the first coils 303 is the same as the attractive force or the repulsive force to the corresponding rotor magnetic steels 208, preferably, the number of the rotor magnetic steels 208 is four, and the number of the first coils 303 is four, so when the rotor magnetic steels 208 rotate for 1 turn, the number of magnetic field changes of all the first coils 303 is four, and the rotor assembly 200 is straightened under the assumption that the number of magnetic field changes of 1 minute rotor assembly 200 is 1000 turns, the number of magnetic field changes of the first coils 303 is 4000, if the number of the second coils 403 is eight, after the rotor assembly 200 rotates 1000 turns under the assumption that the number of magnetic field changes of all the first coils 303 is 8000, and after the rotor assembly 200 deflects during the rotation process, the sensor 108 detects the magnetic force changes of the second permanent magnets 206, the sensor 108 transmits the signal to the controller, and the controller adjusts the magnetic force corresponding to the first coils 303, so that the rotor assembly 200 is straightened, and the magnetic force of the second permanent magnets 206 detected by the sensor 108 also continuously changes during the straightening process of the rotor assembly 200, and the controller corrects the corresponding first coils 200 according to the magnetic force continuously changing of the second permanent magnets 206 detected by the sensor 108, so that the rotor assembly 200 can be prevented from colliding with the rotor assembly 200, and the rotor assembly can be further avoided.

In this embodiment, the rotor assembly 200 also has an automatic centering function under the magnetic force action of the first permanent magnet 303 and the rotor magnetic steel 208, so that the reliability of the automatic centering of the rotor assembly 200 can be further improved under the double magnetic force action of the first permanent magnet 104 and the second permanent magnet 206 and the first coil 303 and the rotor magnetic steel 208, and once the mixed magnetic blood pump is assembled, the rotor assembly 200 is suspended in the first cavity 101, and during the transportation and the carrying process, the rotor assembly 200 still floats in the first cavity 101 under the double magnetic force action of the first permanent magnet 104 and the second permanent magnet 206 and the first coil 303 and the rotor magnetic steel 208, so that the collision between the rotor assembly 200 and other components during the transportation and the carrying process is avoided, the damage of the mixed magnetic blood pump during the transportation and the carrying is avoided, and the requirements of the mixed magnetic blood pump on the transportation and the carrying are reduced.

In this embodiment, a motor stator assembly 400 for driving the rotor assembly 200 to rotate circumferentially is installed in the second cavity 111, in this embodiment, as shown in fig. 12 and 13, the motor stator assembly 400 includes an annular second stator core 401, the second stator core 401 is installed at the cavity bottom of the second cavity 111, a raised second magnetic pole 402 is disposed on the end face of the second stator core 401, which is close to the sealing cover 10, a second coil 403 is installed on the second magnetic pole 402, an insulating layer is preferably disposed between the second coil 403 and the second magnetic pole 402, on an axial projection surface, the circumference where the second magnetic pole 402 is located in the motion track of the rotor magnetic steel 208, in this embodiment, eight second magnetic poles 402 are implemented, so that the second coil 403 generates a tensile force on the rotor 208 after the second coil 403 is electrified, so that the rotor magnetic steel 208 rotates circumferentially, and the motor stator assembly 400 is disposed in the cavity bottom of the cavity 111, the second magnetic pole 403 can reduce the volume of the motor stator assembly, the second magnetic pole 403 can be coincident with the rotor magnetic steel 208, and the rotor magnetic steel 208 can be implemented in the radial direction on the rotor assembly 300, and the rotor magnetic steel 208 can be coincident with the axial projection surface of the rotor assembly 208, and the axial projection surface of the rotor assembly 300, and the axial projection of the rotor assembly can be coincident with the rotor assembly 208, and the axial projection of the rotor assembly can be coincident with the rotor assembly 200, and the axial projection of the rotor assembly can be the rotor assembly 208.

In this embodiment, one end of the first permanent magnet 104, which is close to the volute 20, is a head, one end of the first permanent magnet 104, which is close to the sealing cover 10, is a tail, a magnetism isolating member 106 is mounted at the tail of the first permanent magnet 104, a fixing member 107 is further mounted in the inner cavity of the boss 102, and the sensor 108 is fixed between the magnetism isolating member 106 and the fixing member 107 by the fixing member 107, and the magnetism isolating member 106 covers the tail of the whole first permanent magnet 104, so that magnetism isolating effect can be formed at the tail of the first permanent magnet 104, and the sensor 108 can not detect the magnetic field of the first permanent magnet 104, so that influence of the magnetic field generated by the first permanent magnet 104 on the sensor 108 is avoided, and reliability of magnetic force detection of the sensor 108 on the second permanent magnet 206 is ensured, and reliability of righting the rotor assembly 200 by the magnetic bearing assembly 300 is further improved.

In this embodiment, the support ring 209 is further provided with a second magnetism isolating sleeve 207, the second magnetism isolating sleeve 207 is located between the second permanent magnet 206 and the rotor magnetic steel 208, preferably, the second permanent magnet 206 is sleeved in the second magnetism isolating sleeve 207, the second magnetism isolating sleeve 207 is sleeved in the annular cavity 211, the second magnetism isolating sleeve 207 blocks the magnetic circuits of the first coil 303 and the second permanent magnet 206, and the second magnetism isolating sleeve 207 also blocks the magnetic circuits of the rotor magnetic steel 208 and the second permanent magnet 206, so that the influence of the first coil 303 and the rotor magnetic steel 208 on the magnetic circuits of the second permanent magnet 206 is avoided, the stability of the magnetic force of the second permanent magnet 206 is further ensured, and the reliability of judging the deflection of the rotor assembly 200 by detecting the magnetic force change of the second permanent magnet 206 through the sensor 108 is improved.

In this embodiment, the cavity of the second cavity 111 is provided with a convex ring 109 protruding towards the direction of the sealing cover 10, the convex ring 109 is sleeved with a first magnetism isolating sleeve 110, the first magnetism isolating sleeve 110 is located in the inner ring of the motor stator assembly 400, in this embodiment, in order to increase the magnetic force of the first permanent magnet 104 and the second permanent magnet 206, preferably, the thickness of the first permanent magnet 104 and the second permanent magnet 206 after being stacked is close to the depth of the first cavity 101, therefore, after the sensor 108 is installed, the sensor 108 is located in part or all of the inner ring of the electronic rotor assembly 200, by arranging the convex ring 109, an installation space is provided for installing the fixing piece 107, the sensor 108 and the magnetism isolating piece 106, and the first magnetism isolating sleeve 110 is sleeved on the convex ring 109, so that the influence of the magnetic field generated by the second coil 403 on the sensor 108 is avoided, in this embodiment, a magnetic channel of the second permanent magnet 206 is formed by the part between the first magnetism isolating sleeve 110 and the magnetism isolating piece 206, and the sensor 108 detects the magnetic force of the second permanent magnet 206, and the reliability of the second permanent magnet assembly is only increased by detecting the magnetic force of the second permanent magnet 206, and the reliability of the magnetic isolating piece is improved by detecting the second permanent magnet 206, and the reliability of the magnetic bearing assembly is improved.

Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.

Claims (7)

1. A driving device for a magnetic mixing blood pump, which is characterized in that: including casing, rotor subassembly and motor stator subassembly, be provided with first cavity and second cavity on the casing, first cavity is located second cavity top, rotor subassembly automatic centering is suspended in first cavity, be provided with multiunit rotor magnet steel in the rotor subassembly, multiunit rotor magnet steel evenly distributed is on using a circumference, motor stator subassembly includes annular second stator core, second stator core installs the chamber bottom of second cavity, be provided with bellied second magnetic pole on the second stator core on keeping away from on the terminal surface of first cavity, install the second coil on the second magnetic pole, the second coil with be provided with the insulating layer between the second magnetic pole, on axial projection face, the circumference that the second magnetic pole is located in the rotor magnet steel motion track.

2. The drive device for a hybrid blood pump according to claim 1, wherein: the middle part of the second cavity is sunken towards the first cavity and forms a convex column, the convex column penetrates through the first cavity, a first permanent magnet is fixedly installed in an inner cavity of the convex column, a circular second permanent magnet is installed on the rotor assembly, axial leads of the first permanent magnet and the second permanent magnet are coincident, and the circumferential diameter of the second permanent magnet is smaller than that of the rotor magnetic steel.

3. The drive device for a hybrid blood pump according to claim 2, wherein: the cavity of second cavity is provided with down bellied bulge loop, the cover has first magnetism isolating sleeve on the bulge loop, first magnetism isolating sleeve is located in the inner circle of second stator core.

4. The drive device for a hybrid blood pump according to claim 1, wherein: the insulating layer is insulating paint.

5. The drive device for a hybrid blood pump according to claim 1, wherein: the number of the rotor magnetic steels is four, and two opposite rotor magnetic steels are one group.

6. The drive device for a hybrid blood pump according to claim 2, wherein: the first permanent magnet and the second permanent magnet are multiple and are arranged in a laminated mode.

7. The drive device for a hybrid blood pump according to claim 2, wherein: the rotor assembly is further provided with a second magnetism isolating sleeve, and the second magnetism isolating sleeve is located between the second permanent magnet and the rotor magnetic steel.