Rotor impeller for a magnetic levitation axial flow pump

Abstract

The utility model discloses a rotor impeller for magnetic suspension axial flow pump, including the wheel rim of annular, is inlayed with permanent magnet in the wheel rim, makes it have the N pole and S pole of radial distribution, and the uniform distribution of several pieces of blade has in the wheel rim inboard around its one week, one side of blade is fixedly connected with the wheel rim, and the both ends of the other side twist to the opposite direction, wherein, the side of blade and the wheel rim link to each other with the wheel rim's axial line and has the included angle. The utility model discloses whole structure is simpler, and the assembly is convenient, and the working stability is better, and the efficiency is better, and can reduce the production cost of pump.

Description

Technical Field

[0001] This utility model relates to the field of axial flow pump components, and in particular to a rotor impeller for a magnetic levitation axial flow pump. Background Technology

[0002] Currently, the incidence of heart failure is increasing exponentially year by year. In the late stages of various heart diseases, only heart transplantation can save lives. Due to a severe shortage of heart donors, most patients die from extreme heart failure before receiving a donor. An artificial heart pump, also known as a blood pump, is a device that helps the heart perform its pumping function. It is used to compensate for or replace heart function. For hearts that cannot fully recover their function, it can replace the natural heart in performing physiological pumping functions for a long time, prolonging the patient's life.

[0003] With technological advancements, magnetic levitation technology is increasingly being adopted in artificial heart pumps, offering advantages such as frictionless operation, low loss, simple structure, and high efficiency. Existing axial-flow blood pumps consist of a stator, rotor, and housing. The magnetic levitation drive is achieved by placing a drive coil on the stator and permanent magnets on both sides of the rotor to levitate it. However, existing suspended rotor impeller structures mainly consist of a rim and blades located outside the rim. Assembly requires a support shaft. While this type of suspended rotor impeller achieves levitation primarily through a suspension structure between the rim and the support shaft, the significant distance between the blades and the rotor axis results in a large lever arm. During operation, the impeller performs work on the fluid, and the fluid, in turn, disturbs the impeller, making it highly susceptible to instability under fluid imbalance. This negatively impacts fluid flow efficiency and pump efficiency. Furthermore, these pumps are generally large, cumbersome to assemble, and have high production costs. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to solve the technical problems existing in the prior art and provide a rotor impeller for a magnetic levitation axial flow pump, which has a simpler overall structure, is easier to assemble, has better working stability and efficiency, and can reduce the production cost of the pump.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a rotor impeller for a magnetic levitation axial flow pump, characterized in that: it includes an annular rim, a permanent magnet is embedded in the rim, which has N poles and S poles distributed radially, and several blades are evenly distributed around the inner side of the rim.

[0006] Furthermore, one side of the blade is fixedly connected to the rim, and the two ends of the other side are twisted in opposite directions; wherein, the side of the blade connected to the rim has an angle with the axis of the rim.

[0007] Furthermore, the blade and the wheel rim are formed as one piece.

[0008] Furthermore, the width of the blade is less than 1 / 2 of the inner diameter of the wheel rim.

[0009] Furthermore, the projections of several blades on the side closest to the wheel rim axis onto a plane perpendicular to the wheel rim axis lie on the same circumference, and the center of the circle lies on the wheel rim axis.

[0010] Furthermore, one side of the wheel rim has an annular groove, the permanent magnet is annular and installed in the groove, and a cover plate is provided on the outside of the groove to close the groove.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The overall structure is simple. During assembly, simply install the rotor impeller into the housing and align it with the drive position of the suspension coil used to control the suspension of the rotor impeller. This makes assembly more convenient, significantly improves the assembly efficiency of the entire pump, and reduces the production cost of the pump.

[0012] 2. In this design, the blades are located inside the impeller rim, making the blades closer to the rotor axis and the lever arm smaller. This results in less unbalanced disturbance from the fluid, effectively improving the stability of the rotor impeller during operation and greatly enhancing the pump's efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 A sectional view.

[0015] Figure 3 This is a schematic diagram of the structure during assembly of this utility model.

[0016] Figure 4 for Figure 3 A schematic diagram of the internal structure.

[0017] In the diagram: 1—rim, 2—blade, 3—permanent magnet, 4—outer shell, 5—magnetic rod, 6—levitation coil. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0020] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example: See Figure 1 , Figure 2A rotor impeller for a magnetically levitated axial flow pump includes an annular rim 1, within which a permanent magnet 3 is embedded, having radially distributed N and S poles. In actual manufacturing, one side of the rim 1 has an annular groove, and the annular permanent magnet 3 is installed within this groove. The permanent magnet 3 is divided into two symmetrical parts along a certain radial direction, one part being the N pole and the other the S pole. During manufacturing, the annular permanent magnet 3 is placed in a magnetizer and magnetized parallel to each other, thus achieving the effect that one half of the permanent magnet 3 forms the S pole and the other half forms the N pole (this technology is a mature existing technology). A cover plate is provided outside the groove to seal it, and this cover plate is integrally formed with the rim 1 by ultrasonic welding.

[0022] Several blades 2 are evenly distributed around the inner side of the rim 1; during manufacturing, the blades 2 are integrally formed with the rim 1. One side of each blade 2 is fixedly connected to the rim 1, while the two ends of the other side are twisted in opposite directions; the side of the blade 2 connected to the rim 1 forms an angle with the axis of the rim 1. In practice, the corresponding ends of each blade 2 twist in the same direction, thereby driving the fluid to move along the axial direction of the rim 1.

[0023] In actual processing, the width of the blades 2 is less than half the inner diameter of the rim 1; this avoids the blades 2 intersecting and obstructing the fluid, thereby increasing the fluid flow rate. As an optimization, the projections of several blades 2 on the side closest to the rim 1's axis onto a plane perpendicular to the rim 1's axis lie on the same circumference, with the center of the circle located on the rim 1's axis. This allows the fluid to flow faster through the center of the rim 1, and after passing through the rotor impeller, the overall flow velocity is higher and the pressure is greater.

[0024] See Figure 3 , Figure 4 During assembly, the rotor impeller is installed into the housing 4 and aligned with the driving position of the suspension coil 6 used to control the levitation of the rotor impeller. In one embodiment, the axial flow pump used in this solution includes a housing 4, the middle of which has a core tube extending through both ends; one end of the core tube has an enlarged diameter to form an assembly section, and the diameter of this assembly section is larger than the outer diameter of the wheel rim 1, with the rotor impeller disposed within this assembly section.

[0025] A receiving groove is provided around the outer side of the outer casing 4. Several magnetic rods 5 are evenly distributed around the receiving groove. One end of each magnetic rod 5 extends to the outside of the assembly section and then bends towards the axis of the core tube, forming a bent section. The rotor impeller is directly opposite this bent section. A levitation coil 6 and a torque coil are wound on each magnetic rod 5. The levitation coil 6 is close to the bent section of the magnetic rod 5, and the torque coil is close to the connecting plate. When the levitation coil 6 is energized, the generated magnetic field is transmitted to the rotor impeller rim 1 through the magnetic rods 5, causing the rotor impeller rim 1 to receive a uniform thrust or pull force circumferentially. This creates a gap between the rotor impeller rim 1 and the interior of the core tube, resulting in levitation.

[0026] This design features a simple overall structure, facilitating assembly and eliminating the need for additional components. This significantly improves the overall pump assembly efficiency and reduces production costs. Furthermore, the placement of blade 2 inside the impeller rim 1 brings it closer to the rotor axis, resulting in a smaller lever arm. This minimizes fluid imbalance disturbances, effectively enhancing the stability of the rotor impeller during operation and greatly improving pump efficiency.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A rotor impeller for a magnetically levitated axial flow pump, characterized in that: It includes a ring-shaped rim, in which a permanent magnet is embedded, giving it radially distributed N and S poles. Several blades are evenly distributed around the inner side of the rim. One side of each blade is fixedly connected to the rim, while the two ends of the other side are twisted in opposite directions. The side of the blade connected to the rim forms an angle with the axis of the rim. The width of the blade is less than 1 / 2 of the inner diameter of the rim; the projections of the sides of several blades closest to the rim axis on a plane perpendicular to the rim axis are located on the same circumference, and the center of the circle is located on the rim axis.

2. The rotor impeller for a magnetically levitated axial flow pump according to claim 1, characterized in that: The blades and wheel rims are formed as one piece.

3. The rotor impeller for a magnetically levitated axial flow pump according to claim 1, characterized in that: One side of the wheel rim has an annular groove, the permanent magnet is annular and installed in the groove, and a cover plate is provided on the outside of the groove to close the groove.

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