A bearingless axial flow pump structure

Abstract

This utility model discloses a bearingless axial flow pump structure, including a housing, a core tube, and a rotor impeller. One end of the core tube has an enlarged diameter to form an assembly section, within which the rotor impeller is located. A receiving groove is provided around the outer side of the housing, and several magnetic rods are evenly distributed around the groove. The magnetic rods are generally L-shaped, and their other ends are connected to the housing via a connecting plate. A levitation coil and a torque coil are wound on the magnetic rods, with the levitation coil near the bent section of the magnetic rod and the torque coil near the connecting plate. This utility model features independent control of levitation and rotation, high reliability, a small rotor shaft-to-diameter ratio, and blades located inside the impeller rim, significantly improving liquid flowability, resulting in higher pump efficiency and a smaller overall pump size.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a bearingless axial flow pump structure. 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 structure achieving magnetic levitation involves placing drive coils on the stator and permanent magnets on both sides of the rotor to levitate it. The stator is located outside the housing. This magnetic levitation axial-flow pump structure is similar to traditional magnetic bearing motors, relying on radial magnetic bearings at both ends of a relatively long rotor for radial levitation. This leads to the following problems: 1. Using permanent magnets to levitate the rotor axially from both sides increases the overall length of the axial-flow pump; 2. Relying on passive permanent magnet force to restrict axial movement of the rotor, and then using a motor structure in the middle of the rotor to achieve rotation, means that levitation and rotation are structurally separated. This results in a complex structure, lower reliability, and poor fluid flow through the outer ring of the impeller, easily leading to reduced efficiency. 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 bearingless axial flow pump structure. The structure is simple, the suspension and rotation are independently controlled, the reliability is high, the rotor shaft diameter ratio is small, and the blades are inside the wheel ring, which can greatly improve the liquid flowability, make the pump more efficient during operation, and the overall pump size is smaller.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a bearingless axial flow pump structure, characterized in that: it includes a shell, a core tube, and a rotor impeller; the shell has a through hole in the middle that extends through both ends; one end of the core tube has an enlarged diameter to form an assembly section and is connected to a core tube flange, and the other end extends through the through hole in the shell; the rotor impeller is disposed in the assembly section, and the rotor impeller includes an annular rim and blades located inside the rim; the outer diameter of the rim is smaller than the inner diameter of the assembly section; a permanent magnet is embedded in the rim, giving it radially distributed N and S poles;

[0006] A receiving groove is provided around the outer side of the outer shell, and several magnetic rods are evenly distributed around the receiving groove. One end of the magnetic rod extends to the outside of the assembly section and then bends and extends towards the axis of the core tube to form a bent section, making the magnetic rod L-shaped as a whole. The other end of the magnetic rod is connected to the outer shell through a connecting plate. A suspension coil and a torque coil are wound on the magnetic rod, wherein the suspension coil is close to the bent section of the magnetic rod, and the torque coil is close to the connecting plate.

[0007] Furthermore, the outer shell has an inlet pipe at one end near the core tube assembly section and an outlet pipe at the other end; outer shell flanges are provided at both ends of the outer shell, and a connecting flange is provided at one end of the inlet pipe and the outlet pipe respectively. The connecting flange of the inlet pipe, the core tube flange, and the outer shell flange at the end of the outer shell near the core tube assembly section are connected in sequence, and the connecting flange of the outlet pipe is connected to the outer shell flange at the other end of the outer shell; rubber sealing gaskets are provided between the connecting flange of the inlet pipe and the core tube flange, and between the connecting flange of the outlet pipe and the outer shell flange.

[0008] Furthermore, there is a tapered transition section between the core tube and the assembly section.

[0009] Furthermore, the number of magnetic rods is 3n or 4n, where n is a positive integer.

[0010] Furthermore, the number of levitation coils is the same as the number of magnetic rods, and each magnetic rod is fitted with a levitation coil.

[0011] Furthermore, the magnetic rods are divided into several groups. When the number of magnetic rods is 3n, each group includes 3 adjacent magnetic rods, and the torque coil is wound on the 3 magnetic rods in the same group. When the number of magnetic rods is 4n, each group includes 2 or 4 adjacent magnetic rods, and the torque coil is wound on the 2 or 4 magnetic rods in the same group.

[0012] Furthermore, insulating paper is provided between the magnetic rod and the levitation coil and the torque coil, insulating paper is also provided between the levitation coil and the torque coil, and insulating paper is also provided between the torque coil and the connecting plate.

[0013] Furthermore, the connecting plate is fixedly connected to the end of the receiving groove, and a slot is provided on the connecting plate corresponding to each magnetic rod, and the magnetic rod is locked in the slot.

[0014] Furthermore, one side of the wheel rim has an annular groove, the permanent magnet is annular and installed in the groove, and a sealing plate is provided on the outside of the groove to close the groove.

[0015] Furthermore, an annular cover plate is provided on the outside of the receiving groove to seal the receiving groove.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The overall structure is simple, with few parts, easy to assemble, and can significantly reduce the size of the entire pump.

[0018] 2. By cooperating with the rotor impeller through the suspension coil and torque coil, the rotor impeller can be suspended and rotated, which is highly reliable. Thus, the rotor impeller can be rotated without contact without bearings, which can effectively improve the efficiency of the rotor impeller and extend the service life of the entire pump.

[0019] 3. The core tube is installed inside the outer casing and coincides with the axis of the inlet and outlet pipes. The rotor impeller has a small rotor shaft diameter ratio and the blades are inside the wheel rim, which can greatly improve the flowability of liquid and effectively improve the liquid delivery efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the internal structure of the outer shell.

[0022] Figure 3 for Figure 2 A schematic diagram of the structure after omitting the core tube.

[0023] In the diagram: 1—outer shell, 2—core tube, 3—rotor impeller, 4—core tube flange, 5—magnetic rod, 6—suspending coil, 7—torque coil, 8—inlet pipe, 9—outlet pipe. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] 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.

[0026] 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.

[0027] Example: See Figure 1 , Figure 2 as well as Figure 3A bearingless axial flow pump structure includes a housing 1, a core tube 2, and a rotor impeller 3. The housing 1 has a through hole in the middle, penetrating both ends. One end of the core tube 2 has an enlarged diameter to form an assembly section, which is connected to a core tube flange 4. The other end passes through the through hole in the housing 1. In implementation, there is a tapered transition section between the core tube 2 and the assembly section. This facilitates the assembly and positioning of the rotor impeller 3 and accelerates the liquid flowing through the rotor impeller 3, thereby increasing the liquid velocity and pressure. The rotor impeller 3 is located within the assembly section. The rotor impeller 3 includes an annular rim and blades located inside the rim. The outer diameter of the rim is smaller than the inner diameter of the assembly section. A permanent magnet is embedded in the rim, giving it radially distributed N and S poles. In actual manufacturing, one side of the rim has an annular groove. The permanent magnet is annular and installed in the groove. The permanent magnet is divided into two symmetrical parts along a certain radial direction, one part being the N pole and the other part being the S pole. During processing, the annular permanent magnet is placed in a magnetizer and magnetized in parallel, resulting in one half of the permanent magnet 3 forming the S pole and the other half forming the N pole (this technology is a mature existing technology). A cover plate is provided on the outside of the groove to seal the groove, and the cover plate is integrally formed with the wheel rim 1 by ultrasonic welding.

[0028] A receiving groove is provided around the outer side of the outer casing 1. Several magnetic rods 5 are evenly distributed around the receiving groove, with the number of rods being 3n or 4n, where n is a positive integer. During processing, the magnetic rods 5 are formed by stacking several silicon steel sheets. 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 2, forming a bent section, making the magnetic rod 5 L-shaped overall. The other end of the magnetic rod 5 is connected to the outer casing 1 via a connecting plate. In practice, the bent section of the magnetic rod 5 is aligned with the rotor impeller 3, ensuring the levitation effect of the rotor impeller 3. A levitation coil 6 and a torque coil 7 are wound on the magnetic rods 5, with the levitation coil 6 near the bent section and the torque coil 7 near the connecting plate. The connecting plate is fixedly connected to the end of the receiving groove, and a slot is provided on the connecting plate corresponding to each magnetic rod 5, into which the magnetic rod 5 is secured. An annular cover plate is also provided on the outside of the receiving groove to seal the receiving groove. In practice, the annular cover plate is connected to the outer shell 1 by adhesive (such as AB glue) to form a whole, and the adhesive fills the receiving groove to fix the components inside the receiving groove, thereby improving the structural stability of the entire pump.

[0029] The number of levitation coils 6 is the same as the number of magnetic rods 5, with one levitation coil 6 mounted on each magnetic rod 5. The magnetic rods 5 are divided into several groups. In one embodiment, when the number of magnetic rods 5 is 3n, each group includes three adjacent magnetic rods 5, and the torque coil 7 is wound on the three magnetic rods of the same group, thus forming a three-phase motor. When the number of magnetic rods 5 is 4n, each group includes two or four adjacent magnetic rods 5, and the torque coil 7 is wound on the two or four magnetic rods of the same group. Insulating paper is provided between the magnetic rods 5 and the levitation coils 6 and torque coils 7 to prevent the sharp edges of the iron core from tearing the insulation layer of the coils. Insulating paper is also provided between the levitation coils 6 and the torque coils 7 to prevent the two coils from conducting due to excessively high temperatures during operation. Insulating paper is also provided between the torque coils 7 and the connecting plate to prevent the torque coils 7 from conducting with the connecting plate and the outer casing 1.

[0030] As an optimization, the outer casing 1 has an inlet pipe 8 at one end near the assembly section of the core tube 2, and an outlet pipe 9 at the other end. Outer casing flanges are provided at both ends of the outer casing 1. A connecting flange is provided at one end of the inlet pipe 8 and the outlet pipe 9. The connecting flange of the inlet pipe 8, the core tube flange 4, and the outer casing flange at the end of the outer casing 1 near the assembly section of the core tube 2 are connected in sequence. The connecting flange of the outlet pipe 9 is connected to the outer casing flange at the other end of the outer casing 1. Rubber sealing gaskets are provided between the connecting flange of the inlet pipe 8 and the core tube flange 4, and between the connecting flange of the outlet pipe 9 and the outer casing flange.

[0031] To facilitate pump use and control, a controller is installed within the accommodating tank during actual manufacturing. This controller controls the direction and magnitude of the current in the suspension coil 6 and the torque coil, thereby controlling the pump's flow rate and pressure as needed. When the suspension coil 6 is energized, its generated magnetic field acts on the rotor impeller 3 through the magnetic guide rod 5, ensuring that the attractive or thrust force received by the rotor circumferentially is equal, maintaining a gap between the rotor and the inner wall of the core tube 2, thus achieving suspension. Similarly, the magnetic field generated when the torque coil is energized is also transmitted to the rotor impeller 3 through the magnetic guide rod 5, causing the rotor impeller 3 to rotate. The principle is consistent with the working principle of a two-phase or three-phase motor. When the rotor impeller 3 rotates, fluid can be transported.

[0032] This design, through the cooperation of the suspension coil 6 and torque coil 7 with the rotor impeller 3, enables the rotor impeller 3 to suspend and rotate, achieving high reliability. This allows for contactless rotation of the rotor impeller 3 without bearings, effectively improving both the efficiency of the rotor impeller 3 and the overall service life of the pump. The core tube 2 is installed inside the outer casing 1 and coincides with the axis of the inlet pipe 8 and outlet pipe 9. Furthermore, the rotor impeller 3 has a small rotor shaft diameter ratio, and the blades are located inside the impeller rim, significantly improving liquid flow and effectively increasing liquid delivery efficiency.

[0033] 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 bearingless axial flow pump structure, characterized by: The device includes a housing, a core tube, and a rotor impeller. The housing has a through hole in the middle that extends through both ends. One end of the core tube has an enlarged diameter to form an assembly section, which is connected to a core tube flange. The other end of the core tube extends through the through hole in the housing. The rotor impeller is located within the assembly section and includes an annular rim and blades located inside the rim. The outer diameter of the rim is smaller than the inner diameter of the assembly section. A permanent magnet is embedded in the rim, giving it radially distributed N and S poles. A receiving groove is provided around the outer side of the outer shell, and several magnetic rods are evenly distributed around the receiving groove. One end of the magnetic rod extends to the outside of the assembly section and then bends and extends towards the axis of the core tube to form a bent section, making the magnetic rod L-shaped as a whole. The other end of the magnetic rod is connected to the outer shell through a connecting plate. A suspension coil and a torque coil are wound on the magnetic rod, wherein the suspension coil is close to the bent section of the magnetic rod, and the torque coil is close to the connecting plate.

2. A bearingless axial flow pump structure according to claim 1, characterized in that: The outer shell has an inlet pipe at one end near the core tube assembly section and an outlet pipe at the other end. Outer shell flanges are located at both ends of the outer shell. A connecting flange is located at one end of each of the inlet and outlet pipes. The connecting flange of the inlet pipe, the core tube flange, and the outer shell flange at the end near the core tube assembly section are connected in sequence. The connecting flange of the outlet pipe is connected to the outer shell flange at the other end of the outer shell. Rubber gaskets are provided between the connecting flange of the inlet pipe and the core tube flange, and between the connecting flange of the outlet pipe and the outer shell flange.

3. The bearingless axial flow pump structure according to claim 1, characterized in that: The core tube and the assembly section have a tapered transition section.

4. The bearingless axial flow pump structure according to claim 1, characterized in that: The number of magnetic rods is 3n or 4n, where n is a positive integer.

5. A bearingless axial flow pump structure according to claim 4, characterized in that: The number of levitation coils is the same as the number of magnetic rods, and each magnetic rod is fitted with a levitation coil.

6. A bearingless axial flow pump structure according to claim 4, characterized in that: The magnetic rods are divided into several groups. When the number of magnetic rods is 3n, each group includes 3 adjacent magnetic rods, and the torque coil is wound on the 3 magnetic rods in the same group. When the number of magnetic rods is 4n, each group includes 2 or 4 adjacent magnetic rods, and the torque coil is wound on the 2 or 4 magnetic rods in the same group.

7. The bearingless axial flow pump structure according to claim 1, characterized in that: Insulating paper is provided between the magnetic rod and the levitation coil and the torque coil, insulating paper is also provided between the levitation coil and the torque coil, and insulating paper is also provided between the torque coil and the connecting plate.

8. A bearingless axial flow pump structure according to claim 7, characterized in that: The connecting plate is fixedly connected to the end of the receiving groove. A slot is provided on the connecting plate for each magnetic rod, and the magnetic rod is locked in the slot.

9. The bearingless axial flow pump structure 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 sealing plate is provided on the outside of the groove to close the groove.

10. The bearingless axial flow pump structure according to claim 1, characterized in that: An annular cover plate is also provided on the outside of the receiving groove to seal the receiving groove.

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