CN115089869A - Mixed magnetic blood pump - Google Patents

Abstract

The invention discloses a mixed magnetic blood pump, wherein a casing is provided with a second cavity, the bottom of the second cavity is provided with a first annular groove, the middle part of the second cavity is provided with a convex column, the convex column penetrates through the first cavity, and a first permanent magnet is fixedly arranged in the inner cavity of the convex column; the rotor assembly is arranged in the first cavity in a suspending manner, and a magnetic bearing assembly for centering the rotor assembly is arranged in the first annular groove; and a motor stator component for driving the rotor component to rotate circumferentially is arranged in the second cavity. The rotor assembly can automatically center and suspend in the first cavity under the action of the first permanent magnet and the second permanent magnet; and after the rotor assembly deviates from the rotating track, the rotor assembly can be righted under the action of the magnetic bearing assembly, and the magnetic force of the first permanent magnet and the second permanent magnet can prevent the rotor assembly from deviating from the preset track and can promote the rotor assembly to be centered, so that the consumption of the rotor assembly in the righting process after deviating from the preset track is reduced.

Description

Mixed magnetic blood pump

Technical Field

The invention relates to an implantable heart auxiliary device, in particular to a mixed magnetic blood pump.

Background

The use of implantable heart assist devices to achieve long-term circulatory support has become a clinically effective method for treating advanced heart failure. The 'continuous blood pump' which is rapidly developed in recent years is relatively suitable for long-term in vivo implantation. The continuous flow blood pump mainly comprises an axial flow pump and a centrifugal pump, and the impeller rotating at high speed is adopted to drive blood to flow. The traditional impeller supporting system is a mechanical bearing, can limit the movement of a rotating impeller in the radial direction and the axial direction, and has high rigidity and compact structure. Mechanical bearings have the disadvantage that the mutually sliding contact surfaces during operation generate friction, wear and local temperature increases, forming blood stagnation zones and thrombus attachment points around the bearing. The impeller, which is rotated at high speed by the third generation implantable cardiac assist device, is supported by a suspension bearing, such as the "HeartMate 3" and "HeartWare HVAD" centrifugal pumps that are currently in common use in the united states. However, blood pumps for long-term implantation in the body need to overcome some important disadvantages, such as: thromboembolism, bleeding, infection, blood pump wear and blood component destruction, and the like. The five-degree-of-freedom full-suspension impeller controlled by magnetic force has large volume, is difficult to implant in patients with small stature, and is not suitable for Asian people and children.

The blood pump is small, therefore each part is high accuracy processing part, and the clearance between each part is also less, and the rotor subassembly is as power component, can not take place contact and friction with other parts, a point contact back, just lead to rotor subassembly and other parts to bump and then lead to the blood pump to damage easily, and if take place the friction, then can the frictional heating, produce a large amount of heat energy, serious will harm people's life safety, and the blood pump is in the use, need continuous consumption electric energy, if the power consumption is high, then lead to the change frequency of electric energy can increase.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a mixed magnetic blood pump.

The purpose of the invention is realized by the following technical scheme: a mixed magnetic blood pump comprises a machine shell and a rotor assembly, wherein a volute is mounted at one end of the machine shell, a liquid inlet pipe orifice and a liquid outlet pipe orifice are formed in the volute, the other end of the machine shell is sealed through a sealing cover, the end face, close to the volute, of the machine shell is sunken towards the direction of the sealing cover to form a first cavity, the end face, close to the sealing cover, of the machine shell is sunken towards the direction of the volute to form a second cavity, the bottom edge of the second cavity is continuously sunken towards the direction of the volute to form a first annular groove, the middle of the second cavity is continuously sunken towards the direction of the volute to form a convex column, the convex column penetrates through the first cavity, and a first permanent magnet is fixedly mounted in the inner cavity of the convex column;

the rotor assembly is provided with a central through hole, the convex column penetrates through the central through hole, a first flow channel is formed by a gap between the convex column and the central through hole, the rotor assembly is provided with a second annular permanent magnet and a plurality of pairs of rotor magnetic steels, the plurality of pairs of rotor magnetic steels are uniformly distributed on the same circumference, the magnetic poles of the adjacent rotor magnetic steels are opposite, the circumference diameter of the second permanent magnet is smaller than that of the rotor magnetic steel, the rotor assembly is suspended in the first cavity under the action of the magnetic attraction force of the first permanent magnet and the second permanent magnet, a second flow channel is formed between the outer side wall of the rotor assembly and the cavity wall of the first cavity, a sensor for detecting the magnetic change of the second permanent magnet is fixedly installed in the inner cavity of the convex column, and the sensor is positioned between the first permanent magnet and the sealing cover;

a magnetic bearing component for centering the rotor component is arranged in the first annular groove;

and a motor stator component for driving the rotor component to rotate circumferentially is arranged in the second cavity.

Optionally, one end of the first permanent magnet, which is close to the volute, is a head, one end of the first permanent magnet, which is close to the sealing cover, is a tail, the tail of the first permanent magnet is provided with a magnetic isolation piece, a fixing piece is further arranged in the inner cavity of the convex column, and the sensor is fixed between the magnetic isolation piece and the fixing piece by the fixing piece.

Optionally, a cushion block is further installed at the bottom of the inner cavity of the convex column, and the first permanent magnet abuts against the cushion block.

Optionally, the rotor subassembly includes rotor housing, apron and support ring, rotor housing is cylindricly, rotor housing's centre bore then is central through-hole, be provided with the impeller on the terminal surface of being close to the spiral case on the rotor housing, the second ring channel has been seted up towards the spiral case direction on the terminal surface of being close to sealed lid on the rotor housing, install the support ring in the second ring channel, and the support ring compresses tightly through installing the apron on rotor housing, form the annular chamber between the inside wall of support ring and the interior rampart of second ring channel, second permanent magnet fixed mounting is in the annular chamber, a plurality of fixed slots have been seted up on the support ring, install the rotor magnet steel in the fixed slot, a plurality of fixed slot evenly distributed is on same circumference, and the circumference diameter at fixed slot place is greater than the circumference diameter at second permanent magnet place.

Optionally, a second magnetism isolating sleeve is further installed on the support ring, and the second magnetism isolating sleeve is located between the second permanent magnet and the rotor magnetic steel.

Optionally, a convex ring protruding toward the sealing cover is arranged in the cavity of the second cavity, a first magnetism isolating sleeve is sleeved on the convex ring, and the first magnetism isolating sleeve is located in an inner ring of the motor stator assembly.

Optionally, the magnetic bearing assembly includes an annular first stator core, a radially inward convex first magnetic pole is arranged on an inner ring of the first stator core, an inner side wall of the first magnetic pole is an arc side wall, a circumference where the inner side wall of the first magnetic pole is located and a circumference where the rotor magnetic steel is located are coaxially arranged, a first coil is installed on the first magnetic pole, an insulating layer is arranged between the first coil and the first magnetic pole, the stator core is attached to an outer ring side wall of the first annular groove, and the inner side wall of the first magnetic pole is attached to an inner ring side wall of the first annular groove.

Optionally, the number of the first magnetic poles is a positive integer multiple of the number of the rotor magnetic steel.

Optionally, the motor stator assembly includes an annular second stator core, the second stator core is installed at the bottom of the second cavity, a protruding second magnetic pole is arranged on the end face, close to the sealing cover, of the second stator core, a second coil is installed on the second magnetic pole, an insulating layer is arranged between the second coil and the second magnetic pole, and on the axial projection plane, the circumference where the second magnetic pole is located in the motion track of the rotor magnetic steel.

The invention has the following advantages: the mixed magnetic blood pump is provided with the first permanent magnet and the second permanent magnet, and the rotor assembly can automatically suspend in the first cavity in a centering manner under the action of the first permanent magnet and the second permanent magnet, so that the rotor assembly of the mixed magnetic blood pump cannot collide with other parts in the conveying and carrying processes, and the requirements of the blood pump on transportation and carrying are further reduced;

according to the mixed magnetic blood pump, after the rotor assembly deviates from the preset track, the sensor can judge the deviation direction of the rotor assembly through the magnetic force change of the second permanent magnet, and the circumferential stress of the rotor assembly can be changed by adjusting the magnetic force change of the rotor magnetic steel corresponding to the first coil, so that the rotor assembly is righted, and the magnetic force of the first permanent magnet and the second permanent magnet can prevent the rotor assembly from deviating from the preset track and can promote the rotor assembly to be centered, so that the energy consumption of the rotor assembly in the righting process after deviating from the preset track is reduced, and further, the energy consumption is reduced.

According to the mixed magnetic blood pump, the magnetic isolation piece, the first magnetic isolation sleeve and the second magnetic isolation sleeve are arranged, so that magnetic interference of a magnetic field of the first permanent magnet, a magnetic field of the first coil on the magnetic bearing assembly and a magnetic field of the second coil on the stator assembly of the motor on the sensor is avoided, the reliability of the sensor for detecting the magnetic force change of the second permanent magnet is improved, and the reliability of the magnetic bearing assembly for righting the rotor assembly is improved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a first schematic view of the installation of the rotor assembly, the magnetic bearing assembly and the motor stator assembly in the casing;

FIG. 4 is a second schematic view illustrating the installation of the rotor assembly, the magnetic bearing assembly and the motor stator assembly in the casing;

FIG. 5 is a schematic cross-sectional view of the mounting of the rotor assembly, the magnetic bearing assembly, and the motor stator assembly in the housing;

FIG. 6 is a schematic view of the structure of the rotor assembly;

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

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

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

FIG. 10 is a schematic view of the positions of the annular cavity and the magnetic steel mounting cavity in the rotor assembly;

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

FIG. 12 is a schematic view of a stator assembly of the electric machine;

FIG. 13 is a cross-sectional schematic view of a stator assembly of the electric machine;

FIG. 14 is a first schematic structural diagram of the housing;

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

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

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

in the figure, 10-sealing cover, 20-volute, 30-liquid inlet pipe, 40-liquid outlet pipe, 100-machine shell, 200-rotor component, 300-magnetic bearing component, 400-motor stator component, 101-first cavity, 102-convex column, 103-blind hole, 104-first permanent magnet, 105-cushion block, 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 magnetic steel, 209-supporting ring, 210-fixing groove, 211-an annular cavity, 212-a magnetic steel installation cavity, 213-a first flow channel, 214-a second flow channel, 301-a first stator core, 302-a first magnetic pole, 303-a first coil, 401-a second stator core, 402-a second magnetic pole, 403-a second coil.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. The components of embodiments of the present invention 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 present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that the present invention is used to usually place, or orientations or positional relationships that are usually understood by those skilled in the art, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

As shown in fig. 1 and 2, a blood pump with mixed magnetic force comprises 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 pipe orifice 30 and a liquid outlet pipe orifice 40 are arranged on the volute 20, a volute cavity is arranged in the volute 20, in this embodiment, the liquid inlet pipe orifice 30 is vertically arranged, and the liquid outlet pipe orifice 40 is arranged along a tangential direction of the volute 20, so that blood can be smoothly discharged from the liquid outlet pipe orifice 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 is introduced from the inlet spout 30 and then is discharged only from the outlet spout 40.

In the present embodiment, as shown in fig. 14 and 15, an end surface of the casing 100 close to the spiral casing 20 is recessed toward the sealing cover 10 to form a first cavity 101, an end surface of the casing 100 close to the sealing cover 10 is recessed toward the spiral casing 20 to form a second cavity 111, in the present embodiment, with the direction of the spiral casing 20 as an upper direction and the direction of the sealing cover 10 as a lower direction, in the present embodiment, a bottom edge of the second cavity 111 is recessed toward the spiral casing 20 to form a first annular groove 112, as shown in fig. 16, a middle portion of the second cavity 111 is recessed toward the spiral casing 20 to form a convex pillar 102, the convex pillar 102 penetrates through the first cavity 101, and a first permanent magnet 104 is fixedly mounted in an inner cavity of the convex pillar 102, in the present embodiment, the spiral casing 20 is integrally formed, and may be formed by casting, in the present embodiment, the spiral casing 20 is a revolving body structure, therefore, the volute 20 can also be manufactured by machining, when the volute 20 is machined, the upper end of the volute 20 has a first cavity 101, the lower end of the volute 20 has a second cavity 111, the first cavity 101 and the second cavity 111 are separated by a partition, and a convex pillar 102 is provided at the center of the first cavity 101, the pillar 102 is a circular pillar, a blind hole 103 is formed upward in the center of the bottom of the second cavity 111, the blind hole 103 is located 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 of a hemispherical head structure, the upper end of the convex column 102 is located outside the first cavity 101, that is, the upper end of the convex column 102 is located in the spiral cavity, the upper end of the convex column 102 is set to be a hemispherical head, and the convex column 102 and the liquid inlet pipe orifice 30 are coaxially arranged, when blood enters the spiral cavity through the liquid inlet pipe orifice 30, the upper end of the convex column 102 of the hemispherical head can uniformly disperse the blood in the spiral cavity.

In this embodiment, the rotor assembly 200 has a central through hole 203, the convex column 102 penetrates through the central through hole 203, the central through hole 203 is a circular hole, a gap between the convex column 102 and the central through hole 203 forms a first flow channel 213, the rotor assembly 200 is mounted with a circular second permanent magnet 206 and a plurality of pairs of rotor magnetic steels 208, the plurality of pairs of rotor magnetic steels 208 are uniformly distributed on the same circumference, and the magnetic poles of the adjacent rotor magnetic steels 208 are opposite, the circumference diameter of the second permanent magnet 206 is smaller than the circumference diameter of the rotor magnetic steels 208, therefore, the second permanent magnet 206 is mounted inside the rotor magnetic steels 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 support ring 209, the rotor housing 201 is cylindrical, the central through hole 203 is the central through hole 201, an impeller 202 is disposed on the end surface of the rotor housing 201 close to the volute 20, the impeller 202 is located in the volute, a second annular groove 204 is formed in the end face, close to the sealing cover 10, of the rotor housing 201 and facing the volute 20, a thin-wall structure is formed between the second annular groove 204 and the central through hole 203, a support ring 209 is installed in the second annular groove 204 and is 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 support ring 209 and the inner annular wall of the second annular groove 204, the second permanent magnet 206 is fixedly installed in the annular cavity 211, a plurality of fixing grooves 210 are formed in the support ring 209, rotor magnetic steel 208 is installed in the fixing grooves 210, the 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 in the outer edge of the support ring 209, and the axial projection of the fixing grooves 210 is fan-shaped, after the support ring 209, the rotor housing 201 and the cover plate 205 are installed, a magnetic steel installation cavity 212 and an annular cavity 211 are formed in the rotor assembly 200, and the size of the rotor magnetic steel 208 is matched with the size of the magnetic steel installation cavity 212, so that after the rotor assembly 200 is assembled, as shown in fig. 17, the rotor magnetic steel 208 is fixedly installed in the magnetic steel installation cavity 212, and the cross section of the rotor magnetic steel 208 is fan-shaped, in this embodiment, the support ring 209 and the cover plate 205 are of an integral structure, so when installing, after the rotor magnetic 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, 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 annular, when the cover plate 205 and the rotor housing 201 are installed, the outer circular side wall of the cover plate 205 is attached to the outer circular side wall of the second annular groove 204, the inner circular side wall of the cover plate 205 is attached to the inner circular side wall of the second annular groove 204, and the inner circular diameter of the support ring 209 is larger than the inner circular diameter of the cover plate 205.

In this embodiment, since the first permanent magnet 104 is installed in the convex pillar 102 and the second permanent magnet 206 is installed on the rotor assembly 200, the first permanent magnet 104 and the second permanent magnet 206 are selected as appropriate, the rotor assembly 200 is suspended in the first cavity 101 under the magnetic attraction of the first permanent magnet 104 and the second permanent magnet 206, in this embodiment, the first permanent magnet 104 is cylindrical and the second permanent magnet 206 is annular, and the first permanent magnet 104 and the second permanent magnet 206 are designed to ensure the coaxiality of the first permanent magnet 104 and the second permanent magnet 206, 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 magnetic action of the first permanent magnet 104 and the second permanent magnet 206, and can also ensure the coaxiality of the central through hole 203 and the convex pillar 102, even when placed, the axial line of the central through hole 203 is deviated from the central line of the convex pillar 102, the rotor assembly 200 is also automatically centered under the action of the magnetic forces of the first permanent magnet 104 and the second permanent magnet 206, so that the central through hole 203 coincides with the axis of the convex pillar 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 the installation of the first permanent magnet 104, a spacer 105 is further installed at the bottom of the inner cavity of the convex column 102, the first permanent magnet 104 abuts against the spacer 105, and the axial position of the first permanent magnet 104 can be adjusted by the thickness of the spacer 105, so as to ensure that the first permanent magnet 104 is located in the first cavity 101, and it is ensured that the first permanent magnet 104 and the second permanent magnet 206 correspond to each other, in this embodiment, the first permanent magnet 104 is provided in plurality, the second permanent magnet 206 is also provided in plurality, that is, the number of the first permanent magnets 104 corresponds to the number of the second permanent magnets 206, when the first permanent magnet 104 and the second permanent magnet 206 are installed in a stacked manner, and after the plurality of first permanent magnets 104 and the plurality of second permanent magnets 206 are installed in a stacked manner, the stability of the magnetic force between the first permanent magnets 104 and the second permanent magnets 206 can be improved, thereby ensuring the stability of the rotor assembly 200 suspended in the first cavity 101 in the self-centering manner.

In this embodiment, as shown in fig. 3, 4 and 5, after the rotor assembly 200 is automatically suspended in the first cavity 101, a gap is formed between an outer side wall of the rotor assembly 200 and a cavity wall of the first cavity 101, and the gap forms the second flow channel 214, since the rotor assembly 200 is suspended in the first cavity 101, the first flow channel 213 and the second flow channel 214 can communicate through a cavity bottom of the first cavity 101, and the upper side of the first flow channel 213 is communicated with the worm cavity, and the upper side of the second flow channel 214 is communicated with the worm cavity, so that a circulation channel is formed among the first flow channel 213, the second flow channel 214, the worm 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 lower than the pressure in the second flow channel 214, so that the blood in the second flow channel 214 flows to the first flow channel 213 and enters the worm cavity from the first flow channel 213, and finally, the mixed magnetic blood pump is discharged through the liquid outlet pipe opening 40, so that dead blood cannot be generated, the use reliability of the mixed magnetic blood pump is ensured, and further, in order to ensure the fluidity of the blood and avoid the occurrence of the dead blood, the bottom edge of the first cavity 101 and the joint of the convex column 102 and the first cavity 101 are both arc-shaped structures.

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

in this embodiment, as shown in fig. 5, a magnetic bearing assembly 300 for centering 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 has a certain impact on the rotor assembly 200, so that when the rotor assembly 200 works, under the flow of fluid, the rotor assembly 200 may find deflection, and after the rotor assembly 200 deflects, the positions of the second permanent magnet 206 and the sensor 108 also change relatively, so that the magnetic force of the second permanent magnet 206 at the sensor 108 changes, and after the sensor 108 detects the change of the magnetic force of the second permanent magnet 206, the sensor 108 transmits the change of the magnetic force to the controller of the hybrid 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 one or more directions on the rotor assembly 200, therefore, the rotor assembly 200 is righted, the rotor assembly 200 is prevented from colliding with other parts, and the use stability of the mixed magnetic blood pump is ensured.

In this embodiment, as shown in fig. 11, the magnetic bearing component 300 includes an annular first stator core 301, a first magnetic pole 302 protruding inward in a radial direction 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, the 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 the magnetic bearing component 300 is mounted in the first annular groove 112, preferably, the insulating layer is made of insulating varnish, 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, that is, the number of the rotor magnetic steels 208 is four, the number of the first magnetic poles 302 is a positive integer 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 force generated by the magnetic field generated by the first coils 303 to the corresponding rotor magnetic steels 208 is the same as the attractive force or the repulsive force, and because the magnetic poles of the adjacent rotor magnetic steels 208 are opposite, the rotor magnetic steels 208 rotate in the circumferential direction, and the position of the first coils 303 is fixed, the direction of the magnetic field generated by the first coils 303 needs to be changed continuously during the rotation of the rotor magnetic steels 208, so as to achieve that the magnetic force generated by the magnetic field generated by the first coils 303 to the corresponding rotor magnetic steels 208 is the same as the attractive force or the repulsive force, preferably, the number of the rotor magnetic steels 208 is four, the number of the first coils 303 is also four, so that when the rotor magnetic steel 208 rotates for 1 turn, the number of times of magnetic field transformation of all the first coils 303 is four, assuming that the rotor assembly 200 rotates for 1000 turns for 1 minute, at this time, the rotor magnetic steel 208 rotates for 1000 turns, and the number of times of magnetic field transformation of the first coils 303 is 4000, if the number of the second coils 403 is eight, after the rotor assembly 200 rotates for 1000 turns for 1 minute, the number of times of magnetic field transformation of all the first coils 303 is 8000, and after the rotor assembly 200 deflects in the rotation process, the sensor 108 detects the magnetic force change of the second permanent magnet 206, the sensor 108 transmits the signal to the controller, the controller adjusts the magnetic force corresponding to the first coils 303, so that the rotor assembly 200 is centered, and during the centering of the rotor assembly 200, the magnetic force of the second permanent magnet 206 detected by the sensor 108 is constantly changed, the controller corrects the magnetic force of the corresponding first coil 303 according to the constantly changing magnetic force of the second permanent magnet 206 detected by the sensor 108, so that the rotor assembly 200 can be stably centered, and the rotor assembly 200 is prevented from colliding with other components.

In this embodiment, the rotor assembly 200 also has a self-centering function under the magnetic force of the first coil 303 and the rotor magnetic steel 208, therefore, under the dual magnetic force action of the first and second permanent magnets 104 and 206 and the first coil 303 and the rotor magnetic steel 208, the reliability of the self-centering of the rotor assembly 200 can be further improved, once the magnetic-mixing blood pump is assembled, the rotor assembly 200 is suspended in the first cavity 101, during transportation and handling, the rotor assembly 200 still floats in the first cavity 101 under the dual magnetic force of the first and second permanent magnets 104 and 206, the first coil 303 and the rotor magnetic steel 208, therefore, collision between the rotor assembly 200 and other parts in the transportation and carrying processes is avoided, damage of the mixed magnetic blood pump in the transportation and carrying processes is avoided, and requirements of the mixed magnetic blood pump on the transportation and 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 a second annular stator core 401, the second stator core 401 is installed at the bottom of the second cavity 111, a protruding second magnetic pole 402 is installed on an end surface of the second stator core 401 close to the sealing cover 10, a second coil 403 is installed on the second magnetic pole 402, an insulating layer is installed between the second coil 403 and the second magnetic pole 402, preferably, the insulating layer is insulating varnish, on an axial projection plane, a circumference where the second magnetic pole 402 is located in a movement track of the rotor magnetic steel 208, in this embodiment, the number of the second magnetic poles 402 is eight, so the number of the second coils 403 is also eight, when the second coil 403 is energized, the second coil 403 generates a pulling force on the rotor magnetic steel 208, so that the rotor magnetic steel 208 rotates circumferentially, further, the rotor assembly 200 rotates circumferentially, in this embodiment, the rotor magnetic steel 208 is a shared magnetic steel of the magnetic bearing assembly 300 and the motor stator assembly 400, the rotor magnetic steel 208 is matched with the magnetic bearing assembly 300 to perform the functions of automatic centering and centering on the rotor assembly 200, and the rotor magnetic steel 208 is matched with the motor stator assembly 400 to achieve circumferential rotation of the rotor assembly 200.

In this embodiment, one end of the first permanent magnet 104 close to the scroll casing 20 is a head portion, one end of the first permanent magnet 104 close to the sealing cover 10 is a tail portion, the tail portion of the first permanent magnet 104 is provided with a magnetic isolation member 106, a fixing member 107 is further installed in the inner cavity of the convex column 102, the sensor 108 is fixed between the magnetic isolation member 106 and the fixing member 107 by the fixing member 107, and the magnetic isolation member 106 covers the whole tail portion of the first permanent magnet 104, so that a magnetic isolation effect can be formed at the tail portion of the first permanent magnet 104, the sensor 108 cannot detect the magnetic field of the first permanent magnet 104, and the influence of the magnetic field generated by the first permanent magnet 104 on the sensor 108 is avoided, thereby ensuring the reliability of the magnetic detection of the sensor 108 on the second permanent magnet 206, and further improving the reliability of the centering of the magnetic bearing assembly 300 on the rotor assembly 200.

In this embodiment, the support ring 209 is further provided with a second magnetic isolation sleeve 207, the second magnetic isolation 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 magnetic isolation sleeve 207, the second magnetic isolation sleeve 207 is sleeved in the annular cavity 211, the second magnetic isolation sleeve 207 blocks the magnetic circuits of the first coil 303 and the second permanent magnet 206, and the second magnetic isolation sleeve 207 further 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 circuit of the second permanent magnet 206 is avoided, and the stability of the magnetic force of the second permanent magnet 206 is ensured, thereby improving the reliability of determining the deviation of the rotor assembly 200 by detecting the change of the magnetic force of the second permanent magnet 206 through the sensor 108.

In this embodiment, the cavity of the second cavity 111 is provided with a convex ring 109 protruding towards the sealing cover 10, the convex ring 109 is sleeved with a first magnetic isolation sleeve 110, the first magnetic isolation 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 stacked first permanent magnet 104 and second permanent magnet 206 is close to the depth of the first cavity 101, therefore, when the sensor 108 is installed, part or all of the sensor 108 is located in the inner ring of the electronic rotor assembly 200, by providing the convex ring 109, an installation space is provided for the installation of the fixing part 107, the sensor 108 and the magnetic isolation member 106, the convex ring 109 is sleeved with the first magnetic isolation sleeve 110, and the first magnetic isolation sleeve 110 avoids the influence of the magnetic field generated by the second coil 403 on the sensor 108, therefore, in this embodiment, the part between the first magnetic isolation sleeve 110 and the magnetic isolation member 106 forms a magnetic flux path of the second permanent magnet 206, the sensor 108 can only detect the magnetic force change of the second permanent magnet 206 passing through the magnetic channel, so that the reliability of the sensor 108 in detecting the magnetic force of the second permanent magnet 206 is improved, and the reliability of the magnetic bearing assembly 300 in centering the rotor assembly 200 is further improved.

The working process of the invention is as follows: after the magnetic-hybrid blood pump is assembled, the rotor assembly 200 is automatically centered and suspended in the first cavity 101 under the magnetic force action of the first permanent magnet 104 and the second permanent magnet 206, after the magnetic-hybrid blood pump is implanted into a human body, the liquid inlet pipe opening 30 can enter blood, the blood can fill the volute cavity and the first cavity 101, the second coil 403 on the electronic stator assembly 200 is controlled by the controller to work according to a certain rule, so that the second coil 403 generates magnetic attraction force on the rotor magnetic steel 208, the rotor magnetic steel 208 rotates circumferentially, the rotor assembly 200 rotates circumferentially, in the rotating process of the rotor assembly 200, the rotor assembly 200 rotates in flowing blood, the flowing of the blood can affect the position of the rotor assembly 200, the rotor assembly 200 cannot rotate in a centered manner, and after the rotor assembly 200 deviates from a preset rotating track, at this time, the sensor 108 detects the magnetic force change of the second permanent magnet 206, the sensor 108 transmits the signal of the magnetic force change to the controller, the controller controls the magnetic force of the corresponding first coil 303 on the magnetic bearing assembly 300 to change according to the received signal, so that the magnetic force between the first coil 303 and the rotor magnetic steel 208 changes, further the force of the rotor assembly 200 in a certain direction or multiple directions in the radial direction changes, and further the rotor assembly 200 is centered, in the centering process, the magnetic force of the second permanent magnet 206 detected by the sensor 108 is constantly changed, and the controller adjusts the magnetic force generated by the corresponding first coil 303 according to the magnetic force signal constantly changed by the second permanent magnet 206, so as to improve the centering reliability of the rotor assembly 200, and after the rotor assembly 200 rotates deviating from the preset track, magnetic attraction between the first permanent magnet 104 and the second permanent magnet 206 can promote the rotor assembly 200 to be automatically righted, and magnetic attraction between the first permanent magnet 104 and the second permanent magnet 206 can also prevent the rotor assembly 200 from deviating from a preset track, so that the rotor assembly 200 can be quickly and reliably righted under the magnetic action of the first coil 303 and the rotor magnetic steel 208 and the action of the first permanent magnet 104 and the second permanent magnet 206, and because of the arrangement of the first permanent magnet 104 and the second permanent magnet 206, a permanent blood pump magnetic force can be generated between the first permanent magnet 104 and the second permanent magnet 206, and further, the energy consumption of the magnetic mixing pump is reduced, under the condition that the output power is the same, the energy consumption is reduced, and further, under the same electric energy action, the use time is prolonged, and the frequency of replacing electric energy is also reduced.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a blood pump mixes magnetism which characterized in that: the spiral casing is mounted at one end of the machine casing, a liquid inlet pipe orifice and a liquid outlet pipe orifice are formed in the spiral casing, the other end of the machine casing is sealed through a sealing cover, the end face, close to the spiral casing, of the machine casing is sunken towards the sealing cover to form a first cavity, the end face, close to the sealing cover, of the machine casing is sunken towards the spiral casing to form a second cavity, the bottom edge of the second cavity is sunken towards the spiral casing to form a first annular groove, the middle of the second cavity is sunken towards the spiral casing to form a convex column, the convex column penetrates through the first cavity, and a first permanent magnet is fixedly mounted in the inner cavity of the convex column;

the rotor component is provided with a central through hole, the convex column passes through the central through hole, and a first flow passage is formed by a gap between the convex column and the central through hole, the rotor component is provided with a second permanent magnet in a ring shape and a plurality of pairs of rotor magnetic steels which are uniformly distributed on the same circumference, the magnetic poles of the adjacent rotor magnetic steels are opposite, the circumferential diameter of the second permanent magnet is smaller than that of the rotor magnetic steels, the rotor assembly is suspended in the first cavity under the action of the magnetic attraction of the first permanent magnet and the second permanent magnet, a second flow channel is formed between the outer side wall of the rotor assembly and the cavity wall of the first cavity, a sensor for detecting the magnetic force change of the second permanent magnet is fixedly arranged in the inner cavity of the convex column, and the sensor is positioned between the first permanent magnet and the sealing cover;

a magnetic bearing component used for righting the rotor component is installed in the first annular groove;

and a motor stator component for driving the rotor component to rotate circumferentially is arranged in the second cavity.

2. The mixed magnetic blood pump of claim 1, wherein: the end that first permanent magnet is close to the spiral case is the head, the one end that first permanent magnet is close to sealed lid is the afterbody, separate magnetism spare is installed to the afterbody of first permanent magnet, still install the mounting in the inner chamber of projection, the sensor quilt the mounting is fixed separate magnetism spare with between the mounting.

3. The mixed magnetic blood pump of claim 2, wherein: and a cushion block is further installed at the bottom of the inner cavity of the convex column, and the first permanent magnet is abutted to the cushion block.

4. The mixed magnetic blood pump of any one of claim 1, wherein: the rotor component comprises a rotor shell, a cover plate and a supporting ring, the rotor shell is cylindrical, the central hole of the rotor shell is a central through hole, the end surface of the rotor shell close to the volute is provided with an impeller, a second annular groove is arranged on the end surface of the rotor shell close to the sealing cover and faces the direction of the volute, the support ring is arranged in the second annular groove, the support ring is pressed by the cover plate arranged on the rotor shell, a ring cavity is formed between the inner side wall of the support ring and the inner ring wall of the second ring groove, the second permanent magnet is fixedly arranged in the annular cavity, a plurality of fixing grooves are arranged on the support ring, the rotor magnetic steel is arranged in the fixed grooves, the fixed grooves are uniformly distributed on the same circumference, and the diameter of the circumference where the fixed groove is located is larger than that of the circumference where the second permanent magnet is located.

5. The mixed magnetic blood pump of claim 4, wherein: and a second magnetism isolating sleeve is further installed on the support ring and is positioned between the second permanent magnet and the rotor magnetic steel.

6. The mixed magnetic blood pump according to any one of claims 1 to 5, characterized in that: the cavity of the second cavity is provided with a convex ring protruding towards the sealing cover, a first magnetism isolating sleeve is sleeved on the convex ring, and the first magnetism isolating sleeve is located in an inner ring of the motor stator assembly.

7. The mixed magnetic blood pump of claim 6, wherein: the magnetic bearing component comprises an annular first stator core, a first magnetic pole which is inward convex in the radial direction is arranged on an inner ring of the first stator core, the inner side wall of the first magnetic pole is an arc side wall, the circumference of the inner side wall of the first magnetic pole is coaxially arranged with the circumference of the rotor magnetic steel, a first coil is installed on the first magnetic pole, an insulating layer is arranged between the first coil and the first magnetic pole, the stator core is attached to the outer ring side wall of the first annular groove, and the inner side wall of the first magnetic pole is attached to the inner ring side wall of the first annular groove.

8. The mixed magnetic blood pump of claim 7, wherein: the number of the first magnetic poles is positive integral multiple of the number of the rotor magnetic steel.

9. The mixed magnetic blood pump of claim 1, wherein: the motor stator assembly comprises an annular second stator core, the second stator core is installed at the bottom of the second cavity, a protruding second magnetic pole is arranged on the end face, close to the sealing cover, of the second stator core, a second coil is installed 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 located in the motion trail of the rotor magnetic steel on the axial projection plane.

10. The mixed magnetic blood pump of claim 1, wherein: the first permanent magnet and the second permanent magnet are both multiple and are arranged in a stacked mode.

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