Axial electromagnetic suspension bearing and blood pump

Abstract

The utility model discloses an axial electromagnetic suspension bearing and a blood pump, the axial electromagnetic suspension bearing comprises a coil winding, an electromagnetic iron core and a permanent magnet ring, the electromagnetic iron core comprises an annular inner iron core, an annular outer iron core and an annular magnetic conductive cover plate, and the coil winding is located in a containing cavity defined by the inner iron core, the outer iron core and the magnetic conductive cover plate; the other end of the inner iron core and the other end of the outer iron core are respectively used as a first magnetic acting force end and a second magnetic acting force end of the electromagnetic iron core; the permanent magnet ring is coaxially arranged on the side, back to the magnetic conductive cover plate, of the electromagnetic iron core and is in clearance fit with the first magnetic acting force end and the second magnetic acting force end. And when the coil winding is electrified, the acting force generated by the first magnetic acting force end on the inner ring of the permanent magnet ring and the acting force generated by the second magnetic acting force end on the outer ring of the permanent magnet ring are attractive force or repulsive force. Under the condition of limited size and limited power, the magnetic acting force can be greatly improved, and the suspension stability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic levitation bearings, and particularly relates to an axial electromagnetic levitation bearing and a blood pump. Background Technique

[0002] In the field of modern medical technology, as an important medical device, the blood pump plays a key role in cardiac assistance and blood circulation support. Among them, the performance of the bearing is crucial for the stable operation and reliability of the blood pump.

[0003] Traditional mechanical bearings have many limitations in blood pump applications. The easy wear of mechanical bearings will reduce the durability of the blood pump, which not only affects the service life of the blood pump, but also may cause thrombosis or other complications because the particles generated by wear enter the blood. In addition, mechanical bearings may cause excessive shear stress or mechanical friction to the blood during high-speed rotation, resulting in hemolysis, seriously affecting the life safety of patients. To overcome these problems, the electromagnetic levitation bearing technology has gradually attracted attention. In the axial electromagnetic levitation bearing, the suspension support is realized through electromagnetic force, effectively eliminating the safety hazards brought by mechanical contact.

[0004] At present, the existing axial electromagnetic levitation bearings generally attract or repel end to end with a permanent magnet through a cylindrical iron core. The magnetic force generated by this structure is small. Especially under the condition that the size, power, etc. are limited, it is difficult to reach the required force value in actual application, resulting in unstable suspension and affecting the working performance of the blood pump. Summary of the Utility Model

[0005] The problem to be solved by the utility model is to provide an axial electromagnetic levitation bearing and a blood pump to overcome the defect that the magnetic force generated by the existing axial electromagnetic levitation bearing is small under the condition of limited size and limited power.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an axial electromagnetic levitation bearing, comprising:

[0007] A coil winding;

[0008] An electromagnet core, the electromagnet core includes an inner iron core, an outer iron core and a magnetic conduction cover plate which are all annular. The inner iron core is coaxially arranged inside the outer iron core. The magnetic conduction cover plate covers one end corresponding to the inner iron core and the outer iron core, and encloses to form an annular accommodation cavity. The coil winding is wound in the accommodation cavity; the other end of the inner iron core and the other end of the outer iron core are respectively used as the first magnetic force end and the second magnetic force end of the electromagnet core, and the first magnetic force end and the second magnetic force end are distributed at intervals;

[0009] and a permanent magnet ring which is coaxially arranged on a side of the electromagnet core facing away from the magnetic conductive cover plate and is in clearance fit with the first magnetic force end and the second magnetic force end; the permanent magnet ring is magnetized in the radial direction so that its two magnetic polarities are respectively distributed on the inner ring and the outer ring, and when the coil winding is energized, the acting force generated by the first magnetic force end on the inner ring of the permanent magnet ring and the acting force generated by the second magnetic force end on the outer ring of the permanent magnet ring are both attractive forces or repulsive forces.

[0010] As a further improvement of the present utility model, an inner magnetic conductive ring and an outer magnetic conductive ring are respectively fixed on the inner circumferential surface and the outer circumferential surface of the permanent magnet ring, the inner magnetic conductive ring is axially opposite to the first magnetic force end, and the outer magnetic conductive ring is axially opposite to the second magnetic force end.

[0011] As a further improvement of the present utility model, the permanent magnet ring, the first magnetic force end and the second magnetic force end are all coaxially distributed, and at least part of the inner ring of the permanent magnet ring is axially opposite to the first magnetic force end, and at least part of the outer ring of the permanent magnet ring is axially opposite to the second magnetic force end.

[0012] As a further improvement of the present utility model, a permanent magnet is fixed on the first magnetic force end and / or the second magnetic force end, and the permanent magnet repels the permanent magnet ring.

[0013] As a further improvement of the present utility model, the permanent magnet is annular, or the permanent magnet is composed of a plurality of fan-shaped permanent magnet pieces which are annularly and equally spaced; the permanent magnet is magnetized in the axial direction, and the magnetic polarities of the parts of the permanent magnet and the permanent magnet ring close to each other are the same.

[0014] As a further improvement of the present utility model, the other ends of the inner iron core and the outer iron core radially extend towards each other to form the first magnetic force end and the second magnetic force end which are both annular, and a plurality of the permanent magnet pieces are all fixed on the end surface of the first magnetic force end and are limited by a boss arranged on the end surface of the first magnetic force end.

[0015] As a further improvement of the present utility model, a magnetic conductive convex ring axially extends from the inner ring of the second magnetic force end, and the magnetic conductive convex ring is coaxially and spacedly distributed outside the permanent magnet.

[0016] As a further improvement of the present utility model, the inner iron core, the outer iron core and the magnetic conductive cover plate are respectively processed and formed independently, positioning ring grooves are arranged on both the inner ring and the outer ring of the magnetic conductive cover plate, one end of the inner iron core is limited in a corresponding positioning ring groove, and one end of the outer iron core is limited in the other positioning ring groove, so as to be spliced to form the electromagnet core;

[0017] Among them, positioning holes are provided in both of the two positioning ring grooves, and positioning columns for plugging and cooperating with the positioning holes are provided at one end of the inner iron core and one end of the outer iron core.

[0018] As a further improvement of the present invention, a plurality of assembly grooves are provided in the circumferential direction on the first magnetic force end and the second magnetic force end of the electromagnet core, and at least one of the assembly grooves is provided with a sensor for detecting the position of the permanent magnet ring.

[0019] The present invention also provides a blood pump, including: a pump housing and an impeller, the impeller is installed in the pump chamber of the pump housing; the blood pump further includes the axial electromagnetic suspension bearing as described above, the permanent magnet ring in the axial electromagnetic suspension bearing is installed on the impeller, and the electromagnet core in the axial electromagnetic suspension bearing is installed on the pump housing. When the coil winding in the axial electromagnetic suspension bearing is energized, it can cooperate with the permanent magnet ring through the electromagnet core to drive the impeller to axially suspend in the pump chamber.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention provides an axial electromagnetic suspension bearing and a blood pump. The axial electromagnetic suspension bearing includes a coil winding, an electromagnet core and a permanent magnet ring. The electromagnet core is composed of an inner iron core, an outer iron core and a magnetic conduction cover plate, all of which are annular. The coil winding is placed inside the electromagnet core. When the coil winding is energized, two magnetic force ends, namely the first magnetic force end and the second magnetic force end, can be formed on the electromagnet core. At the same time, the permanent magnet ring is radially magnetized. The two magnetic force ends simultaneously generate attraction or repulsion with the inner ring and the outer ring of the permanent magnet ring. Under the condition of limited size and limited power, the magnetic force can be greatly improved to meet the required force value in practical applications and ensure the stability of suspension.

[0022] 2. In the present invention, an inner magnetic conduction ring and an outer magnetic conduction ring are respectively fixed on the inner circumferential surface and the outer circumferential surface of the permanent magnet ring, and the inner magnetic conduction ring is axially opposite to the first magnetic force end, and the outer magnetic conduction ring is axially opposite to the second magnetic force end to guide the magnetic circuit direction, so that the magnetic field direction generated by the energization of the coil winding points axially from the magnetic force end of the electromagnet core to the permanent magnet ring, and a closed magnetic path can be formed between the electromagnet core, the inner magnetic conduction ring and the outer magnetic conduction ring, increasing the magnetic field intensity, and further increasing the magnetic force between the electromagnet core and the permanent magnet ring.

[0023] 3. The electromagnet core in the present invention adopts a splicing structure, which can not only facilitate the assembly of the coil winding, but also make full use of the accommodation cavity space in the electromagnet core and reduce the overall volume.

[0024] 4. A permanent magnet is fixed on the electromagnet core of the present utility model. The permanent magnet repels the permanent magnet ring to generate a thrust on the permanent magnet ring to offset the suction force in the no-load state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of the axial electromagnetic suspension bearing of the present utility model;

[0026] Figure 2 is a cross-sectional view of the axial electromagnetic suspension bearing of the present utility model;

[0027] Figure 3 is a perspective view of the electromagnet core and the permanent magnet in the axial electromagnetic suspension bearing of the present utility model;

[0028] Figure 4 is an exploded view of the axial electromagnetic suspension bearing of the present utility model;

[0029] Figure 5 is a cross-sectional view of the electromagnet core in the axial electromagnetic suspension bearing of the present utility model;

[0030] Figure 6 is a perspective view of the inner iron core and the permanent magnet in the axial electromagnetic suspension bearing of the present utility model;

[0031] Figure 7 is a perspective view of the permanent magnet ring, the inner magnetic conduction ring and the outer magnetic conduction ring in the axial electromagnetic suspension bearing of the present utility model;

[0032] Figure 8 is a cross-sectional view of the axial electromagnetic suspension bearing of the present utility model with the magnetic circuit direction;

[0033] Among them, Figure 8 the direction indicated by the arrow in is the magnetic circuit direction.

[0034] The following description is made with reference to the accompanying drawings:

[0035] 1. Coil winding; 2. Electromagnet core; 21. Inner iron core; 211. First magnetic force end; 212. Boss; 213. Positioning post; 22. Outer iron core; 221. Second magnetic force end; 222. Magnetic conduction convex ring; 223. Positioning post; 23. Magnetic conduction cover plate; 231. Positioning ring groove; 232. Positioning hole; 24. Accommodation cavity; 25. Assembly groove; 3. Permanent magnet ring; 4. Inner magnetic conduction ring; 5. Outer magnetic conduction ring; 6. Permanent magnet; 61. Permanent magnet piece. SPECIFIC EMBODIMENTS

[0036] The following is a detailed description of a preferred embodiment of the present utility model with reference to the accompanying drawings.

[0037] Refer to Figures 1 to 8, the present utility model provides an axial electromagnetic suspension bearing and a blood pump, comprising: a coil winding 1, an electromagnet core 2, and a permanent magnet ring 3.

[0038] Among them, the electromagnet core 2 includes an inner iron core 21, an outer iron core 22, and a magnetic conduction cover plate 23. The inner iron core 21, the outer iron core 22, and the magnetic conduction cover plate 23 are all annular. The inner iron core 21 and the outer iron core 22 both extend in the vertical direction, and the magnetic conduction cover plate 23 extends in the horizontal direction. The inner iron core 21 is coaxially arranged inside the outer iron core 22, and the two are spaced apart. The magnetic conduction cover plate 23 covers the upper ends of the inner iron core 21 and the outer iron core 22 and encloses an annular accommodating cavity 24, and the coil winding 1 is wound in the accommodating cavity 24.

[0039] Further, the lower end of the inner iron core 21 serves as the first magnetic acting end 211 of the electromagnet core 2, and the lower end of the outer iron core 22 serves as the second magnetic acting end 221 of the electromagnet core 2, and the first magnetic acting end 211 and the second magnetic acting end 221 are spaced apart.

[0040] In the present utility model, the permanent magnet ring 3 is coaxially arranged on the side of the electromagnet core 2 facing away from the magnetic conduction cover plate 23, Figure 2 taking the shown orientation as a reference, that is, the permanent magnet ring 3 is coaxially arranged directly below the electromagnet core 2, and the permanent magnet ring 3 has a clearance fit with both the first magnetic acting end 211 and the second magnetic acting end 221, and the gap therebetween forms a magnetic gap.

[0041] It is worth mentioning that the magnetization direction of the permanent magnet ring 3 in the present utility model is radial radiation magnetization, so that its two magnetic polarities are respectively distributed on the inner ring and the outer ring of the permanent magnet ring 3. In this way, when the coil winding 1 is energized, the magnetic field generated by it forms a magnetic path in the electromagnet core 2, and the magnetic polarities of the first magnetic acting end 211 and the second magnetic acting end 221 of the magnetized electromagnet core 2 are different, so that the force generated by the first magnetic acting end 211 on the inner ring of the permanent magnet ring 3 and the force generated by the second magnetic acting end 221 on the outer ring of the permanent magnet ring 3 are both attractive or repulsive forces.

[0042] For example, as Figure 8 shown, when the magnetic polarity of the inner ring of the permanent magnet ring 3 is N pole and the magnetic polarity of the outer ring is S pole, while controlling the current direction of the coil winding 1 (the right side is perpendicular to the paper surface and outward, and the left side is perpendicular to the paper surface and inward), so that the magnetic polarity of the first magnetic acting end 211 is N pole and the magnetic polarity of the second magnetic acting end 221 is S pole, so that the first magnetic acting end 211 repels the inner ring of the permanent magnet ring 3, and the second magnetic acting end 221 also repels the outer ring of the permanent magnet ring 3.

[0043] Similarly, by changing the current direction of the coil winding 1 (the right side is perpendicular to the paper and inward, and the left side is perpendicular to the paper and outward), the magnetic polarity of the first magnetic force end 211 is made to be the S pole, and the magnetic polarity of the second magnetic force end 221 is made to be the N pole. Thus, the first magnetic force end 211 is attracted to the inner ring of the permanent magnet ring 3, and the second magnetic force end 221 is also attracted to the outer ring of the permanent magnet ring 3.

[0044] In the present utility model, by adopting the above-mentioned electromagnet core 2 structure and incorporating the coil winding 1 therein, when the coil winding 1 is energized, two magnetic force ends, namely the first magnetic force end 211 and the second magnetic force end 221, can be formed on the electromagnet core 2. At the same time, the permanent magnet ring 3 is radially magnetized. The two magnetic force ends simultaneously generate attraction or repulsion with the inner and outer rings of the permanent magnet ring 3. Under the condition of limited size and limited power, the magnetic force can be greatly improved, meeting the force value requirements in practical applications and ensuring the stability of suspension.

[0045] In this embodiment, the first magnetic force end 211 is specifically composed of an annular flange portion radially extending from the lower end of the inner iron core 21 along the outer circumference towards the outer iron core 22, and the second magnetic force end 221 is specifically composed of an annular flange portion radially extending from the lower end of the outer iron core 22 along the inner circumference towards the inner iron core 21.

[0046] In this embodiment, the coil winding 1 is integrally connected in series and can use self-adhesive enameled wire.

[0047] Refer to Figure 2 and Figure 7 , an inner magnetic conduction ring 4 is fixed on the inner circumferential surface of the permanent magnet ring 3, and an outer magnetic conduction ring 5 is fixed on the outer circumferential surface. The fixing method can be selected from bonding, welding, etc. The thicknesses of the inner magnetic conduction ring 4 and the outer magnetic conduction ring 5 are preferably the same as the thickness of the permanent magnet ring 3. Among them, the inner magnetic conduction ring 4 is axially opposite to the first magnetic force end 211, and the outer magnetic conduction ring 5 is axially opposite to the second magnetic force end 221. In the present utility model, by respectively fixing the inner magnetic conduction ring 4 and the outer magnetic conduction ring 5 on the inner and outer sides of the permanent magnet ring 3 to guide the magnetic circuit direction, the magnetic field direction generated by energizing the coil winding 1 is directed axially from the magnetic force end of the electromagnet core 2 towards the permanent magnet ring 3, avoiding the magnetic field direction directly pointing from one magnetic force end in the electromagnet core 2 to the other magnetic force end, and a closed magnetic path can be formed among the electromagnet core 2, the inner magnetic conduction ring 4, and the outer magnetic conduction ring 5, increasing the magnetic field intensity, and further increasing the magnetic force between the electromagnet core 2 and the permanent magnet ring 3.

[0048] In this embodiment, both the inner magnetic conduction ring 4 and the outer magnetic conduction ring 5 are made of magnetic conduction materials, including but not limited to pure iron for electrical engineering, or are made of several stacked silicon steel sheets.

[0049] Furthermore, the permanent magnet ring 3, the first magnetic force end 211, and the second magnetic force end 221 are all coaxially distributed, asFigure 2 As shown, at least part of the inner ring of the permanent magnet ring 3 is axially opposite to the first magnetic force end 211, and at least part of the outer ring of the permanent magnet ring 3 is axially opposite to the second magnetic force end 221. In other words, the projection of the permanent magnet ring 3 on the horizontal plane along the axis is between the projections of the first magnetic force end 211 and the second magnetic force end 221 on the same horizontal plane along the axis, and the projection of the permanent magnet ring 3 has at least a partially overlapping area with the projections of the first magnetic force end 211 and the second magnetic force end 221, so as to increase the interaction force between the permanent magnet ring 3 and the first magnetic force end 211 and the second magnetic force end 221.

[0050] It is worth mentioning that a permanent magnet 6 is fixed on the first magnetic force end 211 and / or the second magnetic force end 221. The permanent magnet 6 repels the permanent magnet ring 3 to generate a thrust force on the permanent magnet ring 3 to offset the suction force in the no-load state.

[0051] Exemplarily, the materials of the permanent magnet ring 3 and the permanent magnet 6 are both neodymium iron boron.

[0052] As Figure 3 and Figure 4 shown, in this embodiment, the permanent magnet 6 is composed of a plurality of fan-shaped permanent magnet sheets 61 distributed at equal intervals in a ring shape. The number of the permanent magnet sheets 61 in this embodiment is specifically but not limited to four. The four permanent magnet sheets 61 can all be fixed on the end face of the first magnetic force end 211 by bonding and are limited by a boss 212 provided on the end face of the first magnetic force end 211. The four permanent magnet sheets 61 are all magnetized along the axis, and their magnetic polarities are distributed at the upper and lower ends. And the parts of the permanent magnet sheets 61 and the permanent magnet ring 3 close to each other have the same magnetic polarity, so as to Figure 2 taking the orientation shown as a reference, that is, the magnetic polarity of the lower end of the permanent magnet sheet 61 is the same as the magnetic polarity of the inner ring of the permanent magnet ring 3. Furthermore, the permanent magnet 6 repels the permanent magnet ring 3 to generate a thrust force on the permanent magnet ring 3 to offset the suction force in the no-load state.

[0053] In other embodiments of the present invention, if the electromagnet core 2 does not have the assembly groove 25, the permanent magnet 6 can also be a complete ring, which is also magnetized along the axis, and the parts of it and the permanent magnet ring 3 close to each other have the same magnetic polarity.

[0054] Please refer to Figure 3 and Figure 4, an inner ring of the second magnetic force end 221 extends axially downward to form a magnetic conduction convex ring 222. The magnetic conduction convex ring 222 is annular and is coaxially and spacedly distributed outside the permanent magnet 6. It can be understood that the magnetic conduction convex ring 222 in this embodiment is separated by a plurality of assembly grooves 25 provided on the electromagnet core 2 to form four fan-shaped magnetic conduction bosses, and the four magnetic conduction bosses are correspondingly distributed outside the four permanent magnet pieces 61. By providing the magnetic conduction convex ring 222 on the second magnetic force end 221, the present utility model can further guide the magnetic circuit direction and increase the magnetic force between the electromagnet core 2 and the permanent magnet ring 3.

[0055] In this embodiment, the magnetic conduction convex ring 222 is flush with the bottom surface of the permanent magnet 6; the inner diameter of the inner magnetic conduction ring 4 is the same as the inner diameter of the permanent magnet 6, but the ring width of the inner magnetic conduction ring 4 is smaller than the ring width of the permanent magnet 6; the outer diameter of the outer magnetic conduction ring 5 is the same as the outer diameter of the magnetic conduction convex ring 222, but the ring width of the outer magnetic conduction ring 5 is smaller than the ring width of the magnetic conduction convex ring 222.

[0056] Refer to Figures 4 to 6 , the electromagnet core 2 in the present utility model adopts a split structure, that is, the inner iron core 21, the outer iron core 22 and the magnetic conduction cover plate 23 are each separately processed and formed. Positioning ring grooves 231 are provided on both the inner circle and the outer circle of the magnetic conduction cover plate 23. The upper end of the inner iron core 21 is fixedly limited in the positioning ring groove 231 on the inner circle, and the upper end of the outer iron core 22 is fixedly limited in the positioning ring groove 231 on the outer circle, so as to be spliced to form the electromagnet core 2. The specific assembly steps are as follows: First, the wound coil winding 1 is embedded between the inner iron core 21 and the outer iron core 22, and then the magnetic conduction cover plate 23 is covered on the inner iron core 21 and the outer iron core 22, so as to embed the entire coil winding 1 into the middle of the electromagnet core 2. By adopting the electromagnet core 2 with this splicing structure, not only can the coil winding 1 be easily assembled, but also the space of the accommodating cavity 24 in the electromagnet core 2 can be fully utilized, reducing the overall volume.

[0057] It should be noted that the coil winding 1 can be assembled in both positive and negative directions, but when energized, the magnetic field direction generated by the current in the coil winding 1 needs to be consistent with the magnetic field direction of the permanent magnet 6.

[0058] Among them, the inner iron core 21, the outer iron core 22 and the magnetic conduction cover plate 23 are also all made of magnetic conduction materials, including but not limited to pure iron for electrical engineering, or made of a plurality of stacked silicon steel sheets; the fixing methods of the inner iron core 21 and the outer iron core 22 to the magnetic conduction cover plate 23 can include but are not limited to bonding, welding, riveting, etc.

[0059] In addition, positioning holes 232 are provided in both of the two positioning ring grooves 231 where the magnetic conductive cover plate 23 is located. A positioning post 213 is provided at the upper end of the inner iron core 21, and a positioning post 223 is also provided at the upper end of the outer iron core 22. During assembly, the positioning posts 213 and 223 are inserted and fitted with the two positioning holes 232 to achieve precise assembly of the inner iron core 21, the outer iron core 22, and the magnetic conductive cover plate 23.

[0060] Refer to Figure 3 , on the first magnetic force end 211 and the second magnetic force end 221 of the electromagnet core 2, a plurality of assembly grooves 25 are provided along the circumferential direction. The assembly grooves 25 are used to cooperate with the external housing to increase the installation strength of the axial electromagnetic suspension bearing. In addition, at least one of the assembly grooves 25 is provided with a sensor (not shown in the figure) for detecting the position of the permanent magnet ring 3. The sensor can be a Hall sensor. When the sensor detects that the distance between the permanent magnet ring 3 and the electromagnet core 2 is not within the allowable range, the magnitude of the magnetic force exerted by the electromagnet core 2 on the permanent magnet ring 3 is changed by controlling the magnitude of the current in the coil winding 1, so as to facilitate the stable suspension of the permanent magnet ring 3.

[0061] The present utility model also provides a blood pump, which includes a pump housing, an impeller, and the axial electromagnetic suspension bearing as described above. The impeller is installed in the pump cavity of the pump housing. The permanent magnet ring 3 in the axial electromagnetic suspension bearing is installed on the impeller, and the electromagnet core 2 in the axial electromagnetic suspension bearing is installed on the pump housing. When the coil winding 1 in the axial electromagnetic suspension bearing is energized, the impeller can be driven to axially suspend in the pump cavity by the cooperation of the electromagnet core 2 and the permanent magnet ring 3.

[0062] It can be understood that the axial force received by the impeller during operation also includes hydrodynamic thrust, etc. The suction or repulsion force generated between the electromagnet core 2 and the permanent magnet ring 3 is used to balance other axial forces, so that the impeller can axially suspend in the pump cavity.

[0063] As can be seen, the present utility model provides an axial electromagnetic suspension bearing and a blood pump. The axial electromagnetic suspension bearing includes a coil winding 1, an electromagnet core 2, and a permanent magnet ring 3. The electromagnet core 2 is composed of an inner iron core 21, an outer iron core 22, and a magnetic conduction cover plate 23, all of which are annular. The coil winding 1 is disposed inside the electromagnet core 2. When the coil winding 1 is energized, two magnetic force ends, namely a first magnetic force end 211 and a second magnetic force end 221, can be formed on the electromagnet core 2. At the same time, the permanent magnet ring 3 is radially magnetized. The two magnetic force ends simultaneously generate attraction or repulsion with the inner and outer rings of the permanent magnet ring 3. Under the condition of limited size and limited power, the magnetic force can be greatly improved to meet the force value requirements in practical applications and ensure the stability of suspension. At the same time, in the present utility model, an inner magnetic conduction ring 4 and an outer magnetic conduction ring 5 are respectively fixed on the inner circumferential surface and the outer circumferential surface of the permanent magnet ring 3, and the inner magnetic conduction ring 4 is axially opposite to the first magnetic force end 211, and the outer magnetic conduction ring 5 is axially opposite to the second magnetic force end 221, so as to guide the magnetic circuit direction, make the magnetic field direction generated by energizing the coil winding 1 point axially from the magnetic force end of the electromagnet core 2 to the permanent magnet ring 3, and a closed magnetic path can be formed between the electromagnet core 2, the inner magnetic conduction ring 4, and the outer magnetic conduction ring 5, increasing the magnetic field intensity, and further increasing the magnetic force between the electromagnet core 2 and the permanent magnet ring 3. In addition, the electromagnet core 2 in the present utility model adopts a splicing structure, which can not only facilitate the assembly of the coil winding 1, but also make full use of the space of the accommodating cavity 24 in the electromagnet core 2, reducing the overall volume.

[0064] Many specific details are set forth in the above description in order to fully understand the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. All simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. An axial electromagnetic suspension bearing, characterized in that: include: Coil winding (1); An electromagnet core (2), the electromagnet core (2) comprising an inner core (21), an outer core (22) and a magnetic cover plate (23), all of which are annular; the inner core (21) is coaxially arranged in the outer core (22); the magnetic cover plate (23) is covered on one end of the inner core (21) and the outer core (22) corresponding to each other, and together form an annular accommodating cavity (24); the coil winding (1) is wound in the accommodating cavity (24); the other end of the inner core (21) and the other end of the outer core (22) serve as a first magnetic force end (211) and a second magnetic force end (221) of the electromagnet core (2), respectively, and the first magnetic force end (211) and the second magnetic force end (221) are spaced apart from each other; and a permanent magnetic ring (3), the permanent magnetic ring (3) being coaxially arranged on a side of the electromagnet core (2) facing away from the magnetic conductive cover plate (23), and being gap-matched with the first magnetic force end (211) and the second magnetic force end (221); the permanent magnetic ring (3) is magnetized in the radial direction so that its two magnetic polarities are respectively distributed on the inner ring and the outer ring, and when the coil winding (1) is energized, the force exerted by the first magnetic force end (211) on the inner ring of the permanent magnetic ring (3) and the force exerted by the second magnetic force end (221) on the outer ring of the permanent magnetic ring (3) are both attraction or repulsion.

2. The axial electromagnetic suspension bearing according to claim 1 is characterized in that: An inner magnetic ring (4) and an outer magnetic ring (5) are fixed on the inner circumferential surface and the outer circumferential surface of the permanent magnetic ring (3), respectively; the inner magnetic ring (4) and the first magnetic force end (211) are axially arranged opposite to each other, and the outer magnetic ring (5) and the second magnetic force end (221) are axially arranged opposite to each other.

3. The axial electromagnetic suspension bearing according to claim 1, characterized in that: The permanent magnet ring (3), the first magnetic force end (211) and the second magnetic force end (221) are all coaxially distributed, and at least a portion of the inner ring of the permanent magnet ring (3) is axially arranged opposite to the first magnetic force end (211), and at least a portion of the outer ring of the permanent magnet ring (3) is axially arranged opposite to the second magnetic force end (221).

4. The axial electromagnetic suspension bearing according to claim 1, characterized in that: A permanent magnet (6) is fixed on the first magnetic force end (211) and / or the second magnetic force end (221), and the permanent magnet (6) and the permanent magnet ring (3) repel each other.

5. The axial electromagnetic suspension bearing according to claim 4 is characterized in that: The permanent magnet (6) is annular, or the permanent magnet (6) is composed of a plurality of annular sector-shaped permanent magnet pieces (61) distributed in an annular shape with equal spacing; the permanent magnet (6) is magnetized along the axial direction, and the magnetic polarity of the part close to the permanent magnet ring (3) is the same.

6. The axial electromagnetic suspension bearing according to claim 5, characterized in that: The other end of the inner iron core (21) and the other end of the outer iron core (22) extend radially toward each other to form the first magnetic force end (211) and the second magnetic force end (221) both of which are annular. The plurality of permanent magnet sheets (61) are fixed on the end surface of the first magnetic force end (211) and are limited by a boss (212) provided on the end surface of the first magnetic force end (211).

7. The axial electromagnetic suspension bearing according to claim 6, characterized in that: The inner ring of the second magnetic force end (221) extends axially to form a magnetic convex ring (222), and the magnetic convex ring (222) is coaxially and spaced apart and distributed outside the permanent magnet (6).

8. The axial electromagnetic suspension bearing according to claim 1, characterized in that: The inner iron core (21), the outer iron core (22) and the magnetic conductive cover plate (23) are each processed and formed separately, the inner ring and the outer ring of the magnetic conductive cover plate (23) are both provided with a positioning ring groove (231), one end of the inner iron core (21) is limited to be located in a corresponding one of the positioning ring grooves (231), and one end of the outer iron core (22) is limited to be located in another one of the positioning ring grooves (231), thereby splicing to form the electromagnetic core (2); Wherein, both positioning ring grooves (231) are provided with positioning holes (232), and one end of the inner iron core (21) and one end of the outer iron core (22) are provided with positioning columns (213, 223) for plugging and matching with the positioning holes (232).

9. The axial electromagnetic suspension bearing according to claim 1, characterized in that: The electromagnetic core (2) is provided with a plurality of assembly grooves (25) along a circumferential direction on the first magnetic force end (211) and the second magnetic force end (221), and a sensor for detecting the position of the permanent magnet ring (3) is installed in at least one of the assembly grooves (25).

10. A blood pump, comprising a pump housing and an impeller, wherein the impeller is mounted in a pump chamber of the pump housing, wherein: The blood pump also includes an axial electromagnetic suspension bearing as described in any one of claims 1 to 9, wherein the permanent magnet ring (3) in the axial electromagnetic suspension bearing is installed on the impeller, and the electromagnetic core (2) in the axial electromagnetic suspension bearing is installed on the pump housing. When the coil winding (1) in the axial electromagnetic suspension bearing is energized, the electromagnetic core (2) can cooperate with the permanent magnet ring (3) to drive the impeller to axially suspend in the pump chamber.

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