阅读说明：本技术 一种具有线接触轴承的磁悬浮血泵 (Magnetic suspension blood pump with line contact bearing ) 是由 郭苗 黄健兵 陆斌 曲文宇 赖亚明 刘新 于 2020-12-03 设计创作，主要内容包括：一种具有线接触轴承的磁悬浮血泵,包括泵头和磁悬浮装置,该泵头包括:磁悬浮叶轮和泵壳,该泵壳包括泵顶壳和泵底壳,该泵顶壳与泵底壳互相扣合,该磁悬浮叶轮设置于泵壳内,磁悬浮叶轮和泵壳二者之间具有间隙；该泵底壳内设置有血液流道,在泵壳的外缘设有切向出口管,在泵底壳内设置有环形轴承座或凸起轴承；该磁悬浮叶轮包括叶片、永磁体和叶轮底座,该叶轮底座的下表面设置有与泵底壳相配合的凸起轴承或环形轴承座；该凸起轴承与轴承座/环形轴承座之间的接触方式为线接触。由于本申请磁悬浮血泵采用线接触的轴承,进一步降低了转子定子之间的接触面积,减少轴承结构对血液内细胞的破坏。接触面积和支撑方式可根据转速需求灵活调整。(A magnetic suspension blood pump with a line contact bearing comprises a pump head and a magnetic suspension device, wherein the pump head comprises a magnetic suspension impeller and a pump shell, the pump shell comprises a pump top shell and a pump bottom shell, the pump top shell and the pump bottom shell are mutually buckled, the magnetic suspension impeller is arranged in the pump shell, and a gap is formed between the magnetic suspension impeller and the pump shell; the bottom shell of the pump is internally provided with a blood flow channel, the outer edge of the pump shell is provided with a tangential outlet pipe, and the bottom shell of the pump is internally provided with an annular bearing seat or a convex bearing; the magnetic suspension impeller comprises blades, permanent magnets and an impeller base, wherein a raised bearing or an annular bearing seat matched with a pump bottom shell is arranged on the lower surface of the impeller base; the contact between the raised bearing and the bearing seat/annular bearing seat is line contact. Because this application magnetic suspension blood pump adopts the bearing of line contact, further reduced the area of contact between the rotor stator, reduced the destruction of bearing structure to the cell in the blood. The contact area and the supporting mode can be flexibly adjusted according to the requirement of the rotating speed.)

1. A magnetic suspension blood pump with a line contact bearing comprises a pump head and a magnetic suspension device, and is characterized in that the pump head comprises a magnetic suspension impeller and a pump shell, wherein the pump shell comprises a pump top shell and a pump bottom shell, the pump top shell and the pump bottom shell are mutually buckled, the magnetic suspension impeller is arranged in the pump shell, and a gap is formed between the magnetic suspension impeller and the pump shell; the pump bottom shell is provided with a blood flow channel, the outer edge of the pump bottom shell is provided with a tangential outlet pipe, and an annular bearing seat or a raised bearing is arranged in the pump bottom shell;

the magnetic suspension impeller comprises blades, permanent magnets and an impeller base, wherein the blades are arranged on the upper surface of the impeller base, a central shunt vertebra is arranged in the middle of the upper surface of the impeller base, at least one blood flow perforation is arranged around the central shunt vertebra, and the central shunt vertebra is opposite to an axial inlet pipe arranged on the pump top shell; the lower surface of the impeller base is matched with the pump bottom shell, and the impeller base and the pump bottom shell are mutually attached; the lower surface of the impeller base is provided with a raised bearing or an annular bearing seat matched with the pump bottom shell, and the raised bearing and the annular bearing seat are in line contact; the impeller base is internally provided with a permanent magnet, the magnetic suspension impeller is suspended under the action of magnetic suspension force and is matched with the magnetic suspension device, and a gap between the impeller base and the pump bottom shell enables a section of flow channel to be formed in the pump bottom shell.

2. The magnetically levitated blood pump with a line contact bearing of claim 1, wherein said raised bearing is an ellipsoidal protrusion.

3. The magnetic levitation blood pump with the line contact bearing as recited in claim 1, wherein an annular bearing seat is arranged in the pump bottom shell, and a raised bearing is arranged on the lower surface of the impeller base; or a raised bearing is arranged in the pump bottom shell, and an annular bearing seat is arranged on the lower surface of the impeller base.

4. The magnetically levitated blood pump with line contact bearings of claim 1, wherein the number of raised bearings comprises at least 2, in a symmetrical or asymmetrical distribution.

5. Magnetic levitation blood pump with line contact bearings as claimed in claim 1, wherein the raised bearings can be provided on the front/side of the lower surface of the impeller base or on the front/side of the pump bottom housing.

6. The magnetically levitated blood pump with a line contact bearing of claim 1, wherein said blood flow channel is annular.

7. The magnetically levitated blood pump with line contact bearings of claim 1, wherein said magnetically levitated device is disposed under said pump bottom case, and a magnetically levitated element is disposed therein, said magnetically levitated element including stator soft iron and an electromagnetic coil, said magnetically levitated element and said permanent magnet in the magnetically levitated impeller corresponding to form a motor.

8. The magnetically levitated blood pump with a line contact bearing of claim 7, wherein said permanent magnets have a magnetic pole arrangement that is paired with said stator soft iron.

9. The magnetically levitated blood pump with line contact bearings of any one of claims 1 to 8, wherein a lower surface of the impeller base is inwardly recessed or outwardly protruding; the inner wall shape of the pump bottom shell is matched with the lower surface of the impeller base.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a magnetic suspension blood pump with a line contact bearing.

Background

At present, corresponding rotating shafts or bearings in medical infusion pumps, heart pump systems and other equipment related to distribution of related biological solutions are in large-area contact with the biological solutions, so that the biological solutions or related biological cells in blood around and in a rotating part are easy to break, the related proportion of the biological solutions is disordered, and the biological solutions do not reach the standard. Such problems, if they cause cell damage in a large proportion of the liquid, can cause local high shear stress inside the flow channel, which in turn can cause serious consequences such as flow channel blockage, hemolysis, thrombosis, immunosuppression, etc.

Disclosure of Invention

The application provides a magnetic suspension blood pump with line contact bearing, adopts line contact bearing, reduces because of wearing and tearing and the great relevant problem that arouses of area of contact.

A magnetic suspension blood pump with a line contact bearing comprises a pump head and a magnetic suspension device, wherein the pump head comprises a magnetic suspension impeller and a pump shell, the pump shell comprises a pump top shell and a pump bottom shell, the pump top shell and the pump bottom shell are mutually buckled, the magnetic suspension impeller is arranged in the pump shell, and a gap is formed between the magnetic suspension impeller and the pump shell; the pump bottom shell is provided with a blood flow channel, the outer edge of the pump bottom shell is provided with a tangential outlet pipe, and an annular bearing seat or a raised bearing is arranged in the pump bottom shell;

the magnetic suspension impeller comprises blades, permanent magnets and an impeller base, and the blades are arranged on the upper surface of the impeller base; a central shunt vertebra is arranged in the middle of the upper surface of the impeller base, at least one blood flow perforation is arranged around the central shunt vertebra, and the central shunt vertebra is opposite to an axial inlet pipe arranged on the pump top shell; the lower surface of the impeller base is matched with the pump bottom shell, and the impeller base and the pump bottom shell are mutually attached; the lower surface of the impeller base is provided with a raised bearing or an annular bearing seat matched with the pump bottom shell, and the raised bearing and the annular bearing seat are in line contact; the impeller base is internally provided with a permanent magnet, the magnetic suspension impeller is suspended under the action of magnetic suspension force and is matched with the magnetic suspension device, and a gap between the impeller base and the pump bottom shell enables a section of flow channel to be formed in the pump bottom shell.

In some embodiments, the convex bearing is an ellipsoidal convex.

In some embodiments, an annular bearing seat is arranged in the pump bottom shell, and a raised bearing is arranged on the lower surface of the impeller base; or a raised bearing is arranged in the pump bottom shell, and an annular bearing seat is arranged on the lower surface of the impeller base.

In some embodiments, the number of said protruding bearings comprises at least 2, distributed symmetrically or asymmetrically.

In some embodiments, the boss bearing may be disposed on a front/side of a lower surface of the impeller base or a front/side of the pump bottom case.

In some embodiments, the blood flow channel is annular.

In some embodiments, the magnetic suspension device is disposed below the pump bottom shell, and a magnetic suspension element is disposed in the magnetic suspension device, the magnetic suspension element comprises stator soft iron and an electromagnetic coil, and the magnetic suspension element and the permanent magnet in the magnetic suspension impeller form a motor correspondingly.

In some embodiments, the permanent magnets have a magnetic pole arrangement that is paired with the stator soft iron.

In some embodiments, the lower surface of the impeller base is inwardly recessed or outwardly protruding; the inner wall shape of the pump bottom shell is matched with the lower surface of the impeller base.

According to the embodiment, the power mode of the magnetic suspension blood pump with the line contact bearing is shaftless magnetic transmission, the line contact bearing is adopted, the contact area between a rotor and a stator is further reduced, the number of line contact bearing accessories is less, the contact surface is similar to a section of circumferential line, and the contact area and the support mode can be flexibly adjusted according to the requirement of the rotating speed; compared with the contact area of a spherical contact bearing, the number of the line contact bearing fittings is reduced greatly, and the contact surface is similar to one point. The magnetic suspension blood pump realizes the lowest mechanical contact area in the device by means of radial force and axial force balance, reduces related cell injury (such as blood cells, leucocytes and the like) in biological solution, and has light total mass, small volume and convenient batch production.

Drawings

FIG. 1 is a schematic diagram of a pump head having a line contact bearing according to the present application;

FIG. 2 is a schematic diagram comparing a line contact and a surface contact bearing structure;

fig. 3(a) -3 (b) are schematic structural views of a magnetic levitation impeller of the present application;

FIG. 4 is a schematic structural diagram of a magnetic levitation impeller with a line contact bearing according to a first embodiment;

FIG. 5 is a schematic diagram of a pump bottom shell with a line contact bearing according to a first embodiment;

FIG. 6 is a schematic diagram of a pump head with a line contact bearing according to a first embodiment;

FIG. 7 is a schematic structural diagram of a magnetic levitation impeller with a line contact bearing according to a second embodiment;

FIG. 8 is a schematic diagram of a second embodiment of a pump bottom shell with a line contact bearing;

FIG. 9 is a schematic view of a pump head with a line contact bearing according to a second embodiment;

FIG. 10 is a schematic structural view of a magnetically levitated impeller with line contact bearings according to a third embodiment;

FIG. 11 is a schematic structural view of a pump bottom shell with a line contact bearing of a third embodiment;

FIG. 12 is a schematic view of a pump head with a line contact bearing according to a third embodiment;

FIG. 13 is a schematic structural view of a magnetically levitated impeller with line contact bearings according to a fourth embodiment;

FIG. 14 is a schematic structural view of a pump bottom shell with a line contact bearing of a fourth embodiment;

fig. 15 is a schematic diagram of a fourth embodiment of a pump head with line contact bearings.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

Referring to fig. 1, the present application provides a magnetic suspension blood pump with a line contact bearing, comprising a pump head and a magnetic suspension device (not shown), wherein the pump head comprises a magnetic suspension impeller 4 and a pump casing, the pump casing comprises a pump top casing 2 and a pump bottom casing 5, the pump top casing 2 and the pump bottom casing 5 are buckled with each other, the magnetic suspension impeller 4 is arranged in the pump casing, and a gap is formed between the magnetic suspension impeller 4 and the pump casing 5; a blood flow passage is provided in the pump bottom case 5, a tangential outlet pipe 50 is provided at the outer edge of the pump bottom case 5, and an annular bearing seat (e.g., an annular bearing seat 511 of fig. 5) or a boss bearing (e.g., a boss bearing 512 of fig. 8) is provided in the pump bottom case 5.

The magnetic suspension impeller 4 comprises blades 43, permanent magnets 45 and an impeller base 44, wherein the blades 43 are arranged on the upper surface of the impeller base 44; the central diverging cone 42 is provided in the middle of the upper surface of the impeller base 44, at least one blood flow perforation 40 is provided around the central diverging cone 42, and the central diverging cone 42 is opposite to the axial inlet tube 20 provided in the pump top case 2.

The lower surface of the impeller base 44 is fitted to the pump bottom casing 5, and both are attached to each other. The lower surface of the impeller base 44 is provided with a protruding bearing (such as protruding bearing 411 of fig. 4) or an annular bearing seat (such as protruding bearing 412 of fig. 7) which is matched with the pump bottom shell, and the impeller base 44 is in line contact with the pump bottom shell 5. The permanent magnet 45 is arranged in the impeller base 44, when the magnetic suspension motor works, the permanent magnet 45 is matched with the magnetic suspension device, and the magnetic suspension impeller 4 generates a pulling force towards the pump bottom shell 5 under the action of magnetic suspension force, so that the bearing is tightly attached to the bearing seat, and the blade 43 is not in contact with the pump top shell 2. The clearance between the impeller seat 44 and the pump bottom case 5 allows a blood flow passage to be formed in the pump bottom case 5. After being input through the axial inlet pipe 20, the blood diffuses from the central splitter cone 42 to the four directions, moves to the periphery of the impeller 4 under the action of the centrifugal force of the rotating blades 43, is sent into the blood flow passage, and is collected to the outlet pipe 50. Due to the vortex at the edge of the impeller 4, a small portion of blood flows back from the gap between the impeller 4 and the pump bottom casing 5, passes through the blood perforations 40 and returns to the upper surface of the impeller 4.

In some embodiments, the convex bearing is an ellipsoidal convex. Referring to fig. 4-6, the ellipsoidal protrusions 411 (protruding bearings) on the lower surface of the impeller seat 44 mate with annular bearing seats 511 in the pump bottom casing to make line contact; referring to fig. 7-9, the annular bearing seat 412 on the lower surface of the impeller seat 44 mates with an ellipsoidal projection 512 (raised bearing) in the pump bottom casing, making line contact.

In some embodiments, bearing seats are provided in the pump bottom housing and raised bearings are provided on the lower surface of the impeller base 44. For example: referring to fig. 4-6, the ellipsoidal protrusions 411 (protruding bearings) on the lower surface of the impeller seat 44 mate with annular bearing seats 511 in the pump bottom casing to make line contact.

In other embodiments, raised bearings are provided in the pump bottom housing and bearing seats are provided on the lower surface of the impeller base 44. For example: referring to fig. 7-9, the annular bearing seat 412 on the lower surface of the impeller seat 44 mates with an ellipsoidal projection 512 (raised bearing) in the pump bottom casing, making line contact.

In some embodiments, the number of protruding bearings includes at least 2, and the protruding bearings may be symmetrically or asymmetrically distributed.

In some embodiments, the raised bearings may be disposed on the front or sides of the lower surface of the impeller seat 44. For example: referring to fig. 4 to 6, the ellipsoidal projection 411 of the lower surface of the impeller seat 44 is provided on the front surface of the lower surface of the impeller seat 44, and accordingly, the annular bearing seat 511 is provided on the front surface of the pump bottom case 5; referring to fig. 10 to 12, an ellipsoidal projection 413 of the lower surface of the impeller seat 44 is provided on the side of the lower surface of the impeller seat 44, and accordingly, an annular bearing housing 513 is provided on the side of the pump bottom case 5.

In other embodiments, the raised bearings may be disposed on the front or sides of the pump bottom shell 5. For example: referring to fig. 7-9, the ellipsoidal projection 512 is provided on the front surface of the pump bottom case 5, and the annular bearing seat 412 is provided on the front surface of the lower surface of the impeller base 44; referring to fig. 13-15, an ellipsoidal projection 514 is provided on the side of the pump bottom case 5, and correspondingly, the annular bearing seat 414 is provided on the side of the lower surface of the impeller seat 44.

In some embodiments, the magnetic levitation device is disposed below the pump bottom case 5, and a magnetic levitation element is disposed in the pump bottom case 5, and the magnetic levitation element includes stator soft iron and an electromagnetic coil, and the magnetic levitation element and the permanent magnet 45 in the magnetic levitation impeller form a motor correspondingly.

In some embodiments, the permanent magnets 45 have a magnetic pole arrangement that is paired with the stator soft iron.

In some embodiments, the lower surface of the impeller seat 44 is recessed or protrudes outward; the inner wall of the pump bottom shell is shaped to fit against the lower surface of the impeller base 44.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.