US-12624699-B2 - Magnetic levitation centrifugal pump

US12624699B2US 12624699 B2US12624699 B2US 12624699B2US-12624699-B2

Abstract

A magnetic levitation centrifugal pump, including a volute, stator magnetic ring and a rotor; the volute has a levitation cavity, a medium inlet and a medium outlet, the rotor is located inside the levitation cavity, the stator magnetic ring are fixed to the volute, and the rotor includes a rotor body and dynamic magnetic ring located on the rotor body; the dynamic magnetic ring and the stator magnetic ring are coaxial with each other and are nested, to limit the radial positions of the rotor body and the volute; magnet steel assemblies are further fixed at the rotor body, each magnet steel assembly includes N first magnet steels arranged along the circumferential direction, and magnetic poles of all the first magnet steels are arranged in a staggered manner; two ends of the volute are also encapsulated with driving coil assemblies.

Inventors

Zhifu HAN
Wenjin WU
Qinglin FAN
Xuman ZHANG
Ying Dai
Pengfei Jing
Guogang SONG

Assignees

ROCKETHEART TECHNOLOGY CO. LTD

Dates

Publication Date: 20260512
Application Date: 20230522
Priority Date: 20220523

Claims (11)

1 . A magnetic levitation centrifugal pump, comprising a volute, a stator magnetic ring and a rotor; the volute is provided with a levitation cavity, a medium inlet and a medium outlet, the rotor is located inside the levitation cavity, and the stator magnetic ring is fixed to the volute; the rotor comprises a rotor body and a dynamic magnetic ring positioned on the rotor body; the dynamic magnetic ring and the stator magnetic ring are coaxial with each other and are nested, to limit radial positions of the rotor body and the volute; a magnet steel assembly is further fixed at the rotor body, the magnet steel assembly comprises N first magnet steels arranged along a circumferential direction, and magnetic poles of all the first magnet steels are arranged alternately; two ends of the volute are encapsulated with driving coil assemblies, and two driving coil assemblies cooperate with the magnet steel assembly to provide an axial force for the rotor body to move in an axial direction and a rotational force; wherein two ends of the rotor body are both provided with the magnet steel assemblies, and the magnet steel assemblies at the two ends of the rotor body are symmetrical with respect to a central cross section of the rotor body; the driving coil assemblies located at the two ends of the volute are symmetrical with respect to a central cross section of the levitation cavity; one of the magnet steel assemblies and one of the two driving coil assemblies at a same side form a disc-type motor, and disc-type motors at the two ends jointly provide the axial force for the rotor body to move in the axial direction and the rotational force; or adjacent first magnet steels are attached, the magnet steel assembly further comprises transverse magnetic conductive magnet steels, the magnetic conductive magnet steels being located between two first magnet steels, and all the magnetic conductive magnet steels and all the first magnet steels form an Halbach magnet steel array, wherein the rotor body comprises an annular body and a base body, which are fixedly connected with each other in the axial direction; liquid outlets are provided between the annular body and the base body, a central through-hole of the annular body is in communication with the liquid outlets; the central through-hole is coaxial with the medium inlet, blades are provided between the annular body and the base body to form a fully-enclosed rotor structure, and the magnet steel assemblies are encapsulated in both the annular body and the base body, and the dynamic magnetic ring is encapsulated inside the base body; and wherein a first auxiliary channel is formed between an outer peripheral wall and an outer end wall of the annular body and a corresponding inner wall of the volute; and a second auxiliary channel is formed between an outer peripheral wall and an outer end wall of the first annular encapsulating cavity and a corresponding inner wall of the volute, and between an inner peripheral wall of the first annular encapsulating cavity and the cover body; moreover, an outer end face of the annular body and an outer end face of the base body both have a predetermined included angle with a horizontal plane, and from outside to inside, a distance between the outer end face and the horizontal plane increases.
2 . The magnetic levitation centrifugal pump according to claim 1 , wherein at least one end of the rotor body is also encapsulated with a magnetic component, a corresponding end of the volute is also encapsulated with a magnetic levitation coil, and when the magnetic levitation coil is energized, the magnetic levitation coil and the magnetic component generate an axial force; wherein the magnetic component comprises at least one of an iron core or a second magnet steel.
3 . The magnetic levitation centrifugal pump according to claim 2 , wherein two ends of the rotor body are both encapsulated with the magnetic components, and two magnetic components are able to be symmetrical with respect to a central cross section of the rotor body; and the two ends of the volute are both encapsulated with the magnetic levitation coils, and two magnetic levitation coils are symmetrical with respect to a central cross section of the levitation cavity.
4 . The magnetic levitation centrifugal pump according to claim 2 , wherein there are a plurality of magnetic components evenly arranged along the circumferential direction, and each of the plurality of magnetic components is arranged between adjacent first magnet steels; or/and, the plurality of magnetic components and the first magnet steels are stacked in the axial direction; or/and, the plurality of magnetic levitation coils and the driving coil assemblies are stacked in the axial direction.
5 . The magnetic levitation centrifugal pump according to claim 1 , wherein the base body is provided with a first annular encapsulating cavity, the dynamic magnetic ring is sleeved in an inner ring wall of the first annular encapsulating cavity, first iron cores and the magnet steel assemblies encapsulated in the base body are located on a periphery of the dynamic magnetic ring; and along a radial direction, an axial height of a middle region of the first annular encapsulating cavity is greater than an axial height of an edge region of the first annular encapsulating cavity.
6 . The magnetic levitation centrifugal pump according to claim 5 , wherein the centrifugal pump further comprises a base and a cover body, the cover body comprises a cylinder provided with an opening at one end and a flow guide cone connected with the other end of the cylinder, and the opening of the cylinder is circumferentially sealed and fastened to the base; the stator magnetic ring is fixed to the base by a threaded component and located inside the cylinder, and the base is in a threaded and sealed connection with the volute and coaxial with the medium inlet, and the flow guide cone passes through a central hole of the first annular encapsulating cavity and protrudes towards the medium inlet.
7 . The magnetic levitation centrifugal pump according to claim 1 , wherein an outer end face of the annular body and an outer end face of the base body are both provided with a plurality of protrusions; each of the plurality of protrusions extends from an inner edge side to an outer edge side, and have a predetermined included angle with a radial direction, wherein a spacing between adjacent protrusions decreases in a direction from the outer edge toward the inner edge, or wherein a height of the protrusions decreases in a radial direction toward the inner edge, or, the blades are backward bent blades.
8 . The magnetic levitation centrifugal pump according to claim 1 , wherein the rotor body is an annular housing, a number of the magnet steel assembly is one, and each of the first magnet steels is encapsulated in an inner cavity of the annular housing, and each of the first magnet steels extends from one end of the rotor body to the other end; an end face of the annular housing facing towards the medium inlet of the volute is further provided with at least two groove bodies, and openings of the groove bodies face towards the medium inlet of the volute, each of the groove bodies is located between adjacent first magnet steels, and the groove bodies form main liquid flow channels of the rotor body.
9 . The magnetic levitation centrifugal pump according to claim 1 , wherein at least one end of the rotor body is also encapsulated with a magnetic component, corresponding end of the volute is also encapsulated with a magnetic levitation coil, and when the magnetic levitation coil is energized, the magnetic levitation coil and the magnetic component generate an axial force; wherein the magnetic component comprises at least one of an iron core and a second magnet steel.
10 . The magnetic levitation centrifugal pump according to claim 1 , wherein an inner cavity of the volute is provided with annular housings, sealed cavities are enclosed by the annular housings and the volute, and the driving coil assemblies are located in the sealed cavities; and the levitation cavity is formed between two annular housings at two ends, the two annular housings are of ceramic structures, and the driving coil assemblies are arranged abutting against the annular housings.
11 . The magnetic levitation centrifugal pump according to claim 9 , wherein the two ends of the rotor body are both encapsulated with the magnetic components, and two magnetic components are able to be symmetrical with respect to a central cross section of the rotor body; and the two ends of the volute are both encapsulated with the magnetic levitation coils, and two magnetic levitation coils are symmetrical with respect to a central cross section of the levitation cavity.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present disclosure claims priority to Chinese Patent Application No. 202210565532.4, filed to the China National Intellectual Property Administration on May 23, 2022 and entitled “Magnetic levitation centrifugal pump”, which is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure relates to the technical field of vibration damping, and in particular, to a magnetic levitation centrifugal pump. BACKGROUND Heart failure, popular speaking, is a failure that a natural heart cannot pump sufficient blood flow to maintain systemic blood circulation. Statistics of the World Health Organization (WTO) show that approximately 15%-20% of people suffer from varying degrees of heart failure, the number of people aged 65 or older who are hospitalized due to heart failure accounts for 50% or more of all hospitalizations, while the case fatality rate after 5 years exceeds 50%. For heart failure patients, there are only three therapy pathways: conservative drug therapy, heart transplantation and ventricular assist. The effect of drug therapy is poor, and heart transplantation is very difficult due to the limitation of donors, so a Ventricular Assist Device (VAD) becomes the most effective treatment pathway for all types of end-stage heart failures recognized all over the world. A main component of the ventricular assist device is a blood pump. Generally, an inflow pipeline of the blood pump is connected with a left ventricle or a right ventricle of a human heart, and an outflow pipeline is connected with an aorta or a pulmonary artery. The pump is connected with a control driver (provided with a power supply apparatus); and the control driver controls the blood pump to output blood with a certain pressure (generally in a range of 80-120 mmHg) and flow (generally in a range of 2-10 L/min), so as to share the power demand of the human heart for normal human activities. In view of the limitation of use environment of the blood pump, on the premise of satisfying functions, how to enable the blood pump to have the characteristics of high integration and small volume is a technical problem always concerned by those skilled in the art. SUMMARY An object of some embodiments of the present disclosure is to provide a magnetic levitation centrifugal pump having a small volume and a compact structure. Some embodiments of the present disclosure provide a magnetic levitation centrifugal pump, including a volute, stator magnetic ring and a rotor; the volute is provided with a levitation cavity, a medium inlet and a medium outlet, the rotor is located inside the levitation cavity, and the stator magnetic ring is fixed to the volute;the rotor includes a rotor body and a dynamic magnetic ring positioned on the rotor body; the dynamic magnetic ring and the stator magnetic ring are coaxial with each other and are nested, to limit radial positions of the rotor body and the volute;a magnet steel assembly is further fixed at the rotor body, the magnet steel assembly includes N first magnet steels arranged along a circumferential direction, and magnetic poles of all the first magnet steels are arranged alternately;two ends of the volute are also encapsulated with driving coil assemblies, and the two driving coil assemblies cooperate with the magnet steel assembly to provide an axial force for the rotor body to move in an axial direction and a rotational force for the rotor body to move axially. In the centrifugal pump provided in some embodiments of the present disclosure, axial limiting is provided by the magnet steel assemblies arranged at two ends of the rotor body and corresponding driving coil assemblies on the volute; no additional coil and sensor assembly is required, and thus no additional power consumption is generated due to position control. Since a sensor assembly is not required for axial position control, the centrifugal pump implanted into the body has no electronic device, has a stronger anti-interference capability, higher reliability, and does not decrease in performance with an increase of working time. Therefore, compared with the related art, this axial levitation technique is able to achieve high reliability and miniaturization of a blood pump. In addition, in some embodiments of the present disclosure, full levitation operation of the rotor is able to be realized by the magnetic action between the dynamic magnetic ring and the stator magnetic ring; in this way, there is no mechanical contact between the rotor and the volute (equivalent to a stator), thereby reducing the heat generated and wear, and maximally reducing a possibility of thrombus generation and crushing damage to blood cells. A radial levitation limit of the rotor is able to be realized by the dynamic magnetic ring and the stator magnetic ring. In some embodiments, two ends of the rotor body are both provided with the magnet steel assembly, and the magnet steel assemblies at the two end