WO2023226910A1 - 一种磁悬浮型离心泵 - Google Patents
一种磁悬浮型离心泵 Download PDFInfo
- Publication number
- WO2023226910A1 WO2023226910A1 PCT/CN2023/095432 CN2023095432W WO2023226910A1 WO 2023226910 A1 WO2023226910 A1 WO 2023226910A1 CN 2023095432 W CN2023095432 W CN 2023095432W WO 2023226910 A1 WO2023226910 A1 WO 2023226910A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic
- volute
- rotor
- annular
- centrifugal pump
- Prior art date
Links
- 238000005339 levitation Methods 0.000 title claims abstract description 53
- 230000003068 static effect Effects 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- 238000004806 packaging method and process Methods 0.000 claims description 21
- 239000000725 suspension Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000013459 approach Methods 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 210000000601 blood cell Anatomy 0.000 abstract description 3
- 230000020169 heat generation Effects 0.000 abstract description 3
- 230000023555 blood coagulation Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 abstract 1
- 210000004369 blood Anatomy 0.000 description 13
- 239000008280 blood Substances 0.000 description 13
- 238000009434 installation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 206010019280 Heart failures Diseases 0.000 description 7
- 230000017531 blood circulation Effects 0.000 description 6
- 208000007536 Thrombosis Diseases 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000002861 ventricular Effects 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 206010018910 Haemolysis Diseases 0.000 description 2
- 210000000709 aorta Anatomy 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000008588 hemolysis Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000002054 transplantation Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000005240 left ventricle Anatomy 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 210000001147 pulmonary artery Anatomy 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000005241 right ventricle Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/226—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly radial components
- A61M60/232—Centrifugal pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/419—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/465—Details relating to driving for devices for mechanical circulatory actuation
- A61M60/489—Details relating to driving for devices for mechanical circulatory actuation the force acting on the actuation means being magnetic
- A61M60/492—Details relating to driving for devices for mechanical circulatory actuation the force acting on the actuation means being magnetic generated by permanent magnets
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/81—Pump housings
- A61M60/814—Volutes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/81—Pump housings
- A61M60/816—Sensors arranged on or in the housing, e.g. ultrasound flow sensors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/02—General characteristics of the apparatus characterised by a particular materials
- A61M2205/0211—Ceramics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3327—Measuring
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2210/00—Anatomical parts of the body
- A61M2210/12—Blood circulatory system
- A61M2210/125—Heart
Definitions
- the present application relates to the field of vibration reduction technology, and in particular to a magnetic levitation centrifugal pump.
- Heart failure (English Heart failure, Chinese abbreviation as heart failure), in layman's terms, means that the natural heart cannot pump enough blood flow to maintain blood circulation throughout the body. According to statistics from the World Health Organization (WTO), about 15% to 20% of people will suffer from varying degrees of heart failure. The number of people over 65 years old who are hospitalized due to heart failure accounts for more than 50% of the total number of hospitalizations. At the same time, the mortality rate after 5 years is More than 50%. For patients with heart failure, there are only three treatment options: conservative medication, heart transplantation, and ventricular assist. The effect of drug treatment is poor, and heart transplantation is very difficult due to limited donors.
- WTO World Health Organization
- ventricular assist device (full name in English is Ventricular Assist Device, VAD) has become the most effective treatment for various types of end-stage heart failure recognized around the world.
- the main component of the ventricular assist device is a blood pump (full name in English: Blood Pump).
- the inflow pipe of the blood pump is connected to the left ventricle or right ventricle of the human heart, and the outflow pipe is connected to the aorta or pulmonary artery.
- the pump is connected to a control driver (with power supply equipment), and the control driver controls the output of the blood pump with a certain
- the blood pressure generally ranging from 80 to 120mmHg
- flow generally ranging from 2 to 10L/min
- the purpose of this application is to provide a magnetic levitation centrifugal pump with small volume and compact structure.
- This application provides a magnetic levitation centrifugal pump, including a volute, a static magnetic ring and a rotor;
- the volute has a suspension cavity, a medium inlet and a medium outlet, the rotor is located inside the suspension cavity, and the static magnetic ring is fixed to the volute,
- the rotor includes a rotor body, a moving magnetic ring positioned on the rotor body, and at least two blades; the moving magnetic ring is coaxial with the static magnetic ring and is nested to limit the relationship between the rotor body and the static magnetic ring. radial position of the volute;
- the rotor body is fixed with a magnetic steel assembly.
- the magnetic steel assembly includes N first magnets arranged in the circumferential direction, and the magnetic poles of all the first magnets are staggered.
- the rotor body is also fixed with a magnetic steel assembly.
- the magnetic component includes at least one of a magnetic ring and an iron core;
- the volute is encapsulated with a driving coil assembly arranged opposite to the magnetic steel assembly.
- the driving coil assembly cooperates with the magnetic steel assembly to cause the rotor body to rotate circumferentially; the volute is fixed with a magnetic levitation coil assembly. , when the magnetic levitation coil assembly is energized, the magnetic component and the magnetic levitation coil assembly generate axial force.
- it also includes a position sensor for detecting the axial position of the rotor body;
- the adjacent first magnets are in close contact with each other, or the magnet assembly further includes transverse magnetically permeable magnetic steel, and the permeable magnetic steel is located between the two first magnets, all of which The permeable magnets and all the first magnets form a Halbach magnet array.
- the magnetic steel assembly and the magnetic element are respectively provided at the first end and the second end of the rotor body, and the driving coil assembly and the magnetic levitation coil assembly are respectively provided at the volute. the first end and the second end.
- the inner cavity of the volute is provided with a first annular shell and a second annular shell, and the first annular shell and the second annular shell are respectively located at the first end of the volute. and a second end, the first annular shell and the volute form a first sealed cavity encapsulating the driving coil, the second annular shell and the volute enclose the magnetic levitation
- the second sealed cavity of the coil assembly, the suspension cavity is formed between the first annular shell and the second annular shell, both the first annular shell and the second annular shell are Ceramic structure, the driving coil assembly is arranged against the first annular shell, and the magnetic levitation coil is arranged against the second annular shell.
- the rotor body includes an annular body and a base body, both of which are fixedly arranged in the axial direction, and there is a liquid outlet between the annular body and the base body, and the central through hole of the annular body is connected.
- the liquid outlet, the central through hole and the medium inlet are coaxial, each of the blades is located between the annular body and the base body, and the magnetic steel assembly is packaged inside the annular body.
- the moving magnetic ring and the magnetic component are packaged inside the base.
- the base body has an annular packaging cavity
- the moving magnetic ring is sleeved on the inner wall of the annular packaging cavity
- the magnetic component packaged in the base body is located on the periphery of the moving magnetic ring,
- the axial height of the middle region of the annular packaging cavity is greater than the axial height of the edge region.
- the cover body also includes a base and a cover body.
- the cover body has a cylinder with an opening at one end and a flow guide cone connected to the other end of the cylinder.
- the opening of the cylinder is circumferentially sealed and engaged with the base.
- the static magnetic ring is fixed to the base through a threaded component and is located inside the cylinder, and the base is threaded and sealingly connected to the volute and coaxial with the medium inlet, and the flow guide cone passes through The central hole of the annular packaging cavity protrudes toward the medium inlet.
- a first auxiliary channel is formed between the outer peripheral surface and the outer end surface of the annular body and the corresponding inner wall of the volute, and both the outer peripheral surface and the outer end surface of the annular packaging cavity are between the corresponding inner wall of the volute.
- a second auxiliary channel is formed between the inner peripheral wall of the annular packaging cavity and the cover body, and the outer end surface of the annular body and the outer end surface of the base body both have a predetermined angle with the horizontal plane, from outside to inside , the distance between the outer end surface and the horizontal plane increases.
- the outer end surfaces of the annular body and the base body are each provided with a number of protrusions, the protrusions extend from the inner edge side to the outer edge side, and the protrusions have a predetermined angle with the radial direction, The distance between adjacent protrusions is smaller as it approaches the inner edge or the protrusion has a lower height as it approaches the inner edge;
- the rotor is a centrifugal fully enclosed rotor structure
- the blades are backward curved blades
- the magnetic steel assembly and the magnetic member are respectively provided at the first end and the second end of the rotor body. part, the blade is located between the magnetic steel assembly and the magnetic piece;
- the magnetic component includes a magnetic ring.
- the rotation drive and axial position control of the rotor are completely independent and are located on both sides of the rotor body respectively, so the control logic is relatively simple.
- the full suspension operation of the rotor can be realized through the magnetic force between the moving magnetic ring and the static magnetic ring. In this way, there is no mechanical contact between the rotor and the volute (equivalent to the stator), which reduces heat generation, wear and maximizes It minimizes the possibility of generating thrombus and causing crushing damage to blood cells: the radial suspension limit of the rotor can be achieved by relying on the moving magnetic ring and the static magnetic ring.
- Figure 1 is a schematic three-dimensional structural diagram of a magnetic levitation centrifugal pump in an embodiment of the present application
- Figure 2 is a cross-sectional three-dimensional view of the magnetic levitation centrifugal pump
- Figure 3 is a schematic cross-sectional structural diagram of Figure 1;
- Figure 4 is a schematic structural diagram of a rotor in an embodiment of the present application.
- Figure 5 is a schematic cross-sectional view of the rotor shown in Figure 4 from another perspective;
- Figure 6 is a schematic structural diagram of the rotor body in an embodiment of the present application.
- Figure 7 is a schematic diagram of a rotor in another embodiment of the present application.
- Figure 8 is a schematic diagram of a rotor in yet another embodiment of the present application.
- Figure 1 to Figure 8 100 rotor; 11 seat body; 111 lower cover plate; 112 annular sealed cavity; 113 inner peripheral wall; 12 annular body; 121 upper cover plate; 1211 outer end face; 1212 protrusion; 13 blades; 14 magnetic steel assembly; 15 magnetic components ;16 moving magnetic ring; 17 magnetic parts; 200 volute; 201 first volute; 202 second volute; 203 first annular shell; 204 second annular shell; 21 drive coil assembly; 211 drive coil; 212 working iron core; 22 static magnetic ring; 23 Base; 24 cover; 241 cylinder; 242 guide cone; 26 position sensor; 27 magnetic levitation coil assembly; 271 magnetic levitation coil; 272 magnetic levitation iron core; 300 imported pipe; 400 outlet pipe; 1a first auxiliary flow channel; 1b second auxiliary flow channel; 100a liquid outlet.
- this article uses the application of a magnetic levitation centrifugal pump in heart pumping as an example to introduce the technical solutions and technical effects.
- a magnetic levitation centrifugal pump in heart pumping as an example to introduce the technical solutions and technical effects.
- the magnetic levitation centrifugal pump described in this application is the basis for research on blood pumps, The technical solution is proposed above, but the magnetic levitation centrifugal pump in this article is not limited to use in heart pumping, and its application in other fields is still within the scope of this article.
- Figure 1 is a schematic three-dimensional structural view of a magnetic levitation centrifugal pump in an embodiment of the present application
- Figure 2 is a sectional three-dimensional view of a magnetic levitation centrifugal pump
- Figure 3 is a schematic cross-sectional structural view of Figure 1 .
- This application proposes a magnetic suspension centrifugal pump, which includes a volute, a static magnetic ring and a rotor.
- the volute has a suspension cavity, a medium inlet and a medium outlet, and the rotor is located inside the suspension cavity.
- the volute can include a first volute 201 and a second volute 202, which form an installation space for the rotor.
- the first volute 201 and the second volute 202 can be detachably installed to facilitate the installation of the rotor and other components. Installation and maintenance.
- the first volute 201 may be provided with a medium inlet, and the medium outlet may be surrounded by corresponding structures on the first volute 201 and the second volute 202 .
- An inlet pipe 300 is installed at the medium inlet, and an outlet pipe 400 is installed at the medium outlet.
- the first volute 201, the second volute 202, the inlet pipe 300 and the outlet pipe 400 can all be made of titanium alloy.
- Figure 4 is a schematic structural diagram of the rotor in an embodiment of the present application
- Figure 5 is a schematic diagram of the rotor shown in Figure 4 from another perspective.
- the rotor in this application includes a rotor body, blades 13, moving magnetic rings 16, magnetic parts 17 and magnetic steel components 14.
- the rotor body mainly provides an installation foundation for the installation of other parts that make up the rotor and is assembled with the volute.
- the moving magnetic ring 16, blades 13, magnetic parts 17 and magnetic steel components 14 are all installed on the rotor body.
- the number of blades 13 can be two or more, that is, the number of blades is at least two, and each blade is distributed in the circumferential direction.
- the blades 13 can be backward-curved blades. Back-curved blades can obtain optimized fluid efficiency, shear force and streamline distribution, and under the same output flow and pressure requirements, the diameters of the rotor and volute can be smaller.
- the requirements for motor speed and torque can be lower, the volume of the volute, rotor and motor can be reduced, the pump can be miniaturized under the same output capacity, and the possibility of hemolysis and thrombosis can be reduced to the greatest extent. sex.
- the number of blades 13 can be determined according to the specific pump volume, and can usually be 3 to 7 blades. For example, in a specific example, the number of blades 13 is 5 blades.
- the blades 13 can also be blades of equal thickness or straight blades, as long as they can meet the usage requirements.
- a static magnet ring 22 is installed on the volute 200 .
- the static magnet ring 22 and the moving magnet ring 16 are coaxial and nested to limit the radial positions of the rotor 100 and the volute 200 .
- Both the static magnetic ring 22 and the moving magnetic ring 16 may include two or more annular magnets arranged along the axial direction.
- FIG. 3 shows a specific example in which both the static magnet ring 22 and the moving magnet ring 16 have three annular magnetic rings, and the moving magnet ring 16 is nested in the periphery of the static magnet ring 22 .
- the number of annular magnetic rings in the static magnetic ring 22 and the moving magnetic ring 16 is not limited to this article. Description, can also be other values.
- the moving magnetic ring 16 and the static magnetic ring 22 define the principle of limiting the radial position of the rotor relative to the volute 200: the radial suspension of the rotor is achieved by relying on the repulsive force between the moving magnetic ring and the static magnetic ring.
- the rotor body is equipped with a A moving magnetic ring is assembled; the volute is equipped with a static magnetic ring; both the moving magnetic ring and the static magnetic ring constitute a permanent magnet radial suspension bearing.
- the axial position of the static magnet ring can be adjusted through the precision thread between the base 23 and the volute 200.
- the position of the static magnet ring 22 is adjusted, and when the rotor body is suspended in the middle of the volute suspension cavity along the axial direction, The axial positions of the static magnetic ring 22 and the moving magnetic ring 16 are exactly aligned; at this time, the radial stiffness of the permanent magnet radial suspension bearing formed by the moving magnetic ring 16 and the static magnetic ring 22 is maximum, and the axial force is zero.
- the first end of the rotor body provided by this application is fixed with a magnetic steel assembly 14.
- the magnetic steel assembly 14 includes N first magnets 141 arranged in the circumferential direction.
- the magnetic poles of all first magnets 141 are arranged in a staggered manner.
- the first magnets in the magnet assembly are arranged alternately according to N poles and S poles to form a circle.
- Each magnet in the magnet assembly 14 can be packaged inside the rotor body.
- the first magnets 141 can be in close contact with each other to form a magnetic ring with a full arc. In this way, the disc motor formed with the drive coil assembly 21 installed on the volute 200 can obtain a larger motor. efficiency.
- the magnetic steel assembly 14 may also include transverse conductive magnetic steel 18.
- the conductive magnetic steel 18 is located between the first magnets 141, that is, an equal number of mutually exclusive transverse conductive steels are arranged between the first magnets 141 with staggered magnetic poles.
- the arrangement of the magnetic steel assembly 14 is not limited to the manner described herein, and can also be provided in other manners, as long as the functions described herein can be achieved.
- the first end of the volute 200 corresponding to the rotor mounting magnet assembly 14 is encapsulated with a driving coil assembly 21 , where the driving coil assembly 21 may include a driving coil 211 and a working iron core 212 .
- the driving coil 211 passes current to generate a magnetic field.
- the working iron core 212 amplifies the magnetic field generated by the driving coil 211.
- the first magnets 141 of the magnetic poles of the magnet assembly 14 installed on the rotor body are staggered. A rotational force will be generated to drive the rotor body to rotate.
- the drive coil assembly 21 and the magnetic steel assembly 14 installed inside the rotor body form a disk motor.
- the magnetic levitation coil assembly 27 When the magnetic levitation coil assembly 27 is energized, the magnetic component 17 and the magnetic levitation coil assembly 27 generate axial force. Used to control the axial position of the rotor body. By adjusting the current direction of the magnetic levitation coil assembly 27, the direction of the force between the magnetic levitation coil assembly 271 and the magnetic component 17 can be changed.
- the magnetic levitation coil assembly 27 may include a magnetic levitation coil 271 and a magnetic levitation iron core 272 .
- the axial position of the rotor body can be known through the position sensor.
- the rotor's rotational drive and axial position control are completely independent and are located on both sides of the rotor body, so the control logic is relatively simple.
- the fully suspended operation of the rotor can be realized through the magnetic force between the moving magnetic ring 16 and the static magnetic ring 22.
- the volute 200 equivalent to the stator
- the inner cavity of the volute 200 has a first annular shell 203 and a second annular shell 204.
- the first annular shell 203 and the second annular shell 204 are respectively located at the first end of the volute. end and the second end, the first annular shell 203 and the volute form a first sealed cavity for packaging the drive coil, the second annular shell and the volute form a second sealed cavity for packaging the magnetic levitation coil assembly, and the suspension cavity It is formed between the first annular shell and the second annular shell.
- the first annular shell 203 and the second annular shell 204 are both ceramic structures.
- the driving coil assembly 21 is arranged close to the first annular shell 203 and is magnetically levitated.
- the coil 271 is arranged against the second annular housing 204 .
- Each annular shell can be fixed with the volute through bonding or other methods.
- Ceramic materials have good compatibility with blood. Ceramic materials are very hard and insulating. In this way, the wall thickness of the annular shell can be relatively thin and the driving coil can be close to the inner wall, thus greatly reducing the friction between the driving coil and the first magnet. The air gap between the two magnets completely eliminates eddy current losses.
- the first magnet can be arranged in a Halbach array, which improves the efficiency of the motor and achieves miniaturization of the blood pump while maintaining the maximum output capacity. Due to the ceramic insulation properties, the risk of leakage current from the driving coil to the blood flowing in the volute can be reduced to the greatest extent, and the possibility of interference from external electric fields in the operation of the disc motor formed by the driving coil assembly and the first magnetic steel assembly is eliminated. For example, the magnetic levitation centrifugal pump can still work normally when the patient is receiving electric shock/reversal rate/electrosurgical cutting treatment.
- the rotor body includes an annular body 12 and a base body 11, which are fixedly arranged in the axial direction. Each blade is located between the annular body 12 and the base body 11. There is an outlet between the annular body 12 and the base body 11. The liquid port and the liquid outlet can be located between the two blades.
- the central through hole of the annular body 12 is connected to the liquid outlet 100a.
- the annular body 12 and the base body 11 are both packaged with magnetic steel components.
- the moving magnetic ring 16 is packaged in the base body. 11 interior.
- the annular body 12 and the base body are fixedly arranged along the axial direction, and there is a liquid outlet between the annular body 12 and the base body 11.
- the central through hole of the annular body 12 is connected to the liquid outlet, and the central through hole of the annular body 12 is connected to the liquid outlet.
- the number of liquid outlets 100a can be multiple, evenly arranged along the circumferential direction. The specific number can be determined according to the specific product, and is not limited herein.
- the base body has an annular packaging cavity
- the moving magnetic ring is sleeved on the inner wall of the annular packaging cavity.
- the magnetic components packaged in the base body are located on the periphery of the moving magnetic ring.
- the middle area of the annular packaging cavity is The axial height is greater than the axial height of the edge area.
- the annular packaging cavity can be formed in the following manner: an annular groove is provided on the base, and the lower cover 111 covers the opening of the annular groove to form a sealed chamber.
- the sealing cavity for installing the magnetic steel assembly on the annular body can also be formed by providing an annular groove and the upper cover plate 121 to cooperate with the sealing method.
- the rotor in this application can be a centrifugal fully enclosed rotor.
- the centrifugal pump When the centrifugal pump is working, a large amount of blood flows into the centrifugal pump through the inflow channel. After being accelerated by the centrifugal blades of the rotor, it flows out from the outflow channel and injects the blood into the aorta. Blood circulation throughout the body provides pressure and flow.
- the rotor centrifugal blades can be of hollow structure.
- the static magnet ring can be installed inside the volute in the following manner.
- the magnetic levitation centrifugal pump can further have a base and a cover 24 that is fastened to the base 23.
- the cover 24 is sealed and fixed with the base, and the static magnetic ring is fixed to the base through threaded components.
- the threaded components can be screws or bolts. Or screws and other components.
- the static magnetic ring is installed in the installation space formed by the cover body and the base.
- the second end of the volute is provided with an installation through hole.
- the installation through hole is coaxial with the medium inlet.
- the base 23 is threaded and sealingly connected to the installation through hole.
- the cover 24 includes a cylinder 241 with an opening at one end and a flow guide cone 242 connected to the other end of the cylinder.
- the static magnetic ring 22 is located inside the cylinder 241.
- the flow guide cone 242 passes through the center hole of the base body 11 and faces the medium inlet. bulge. The closer the guide cone 242 is to the medium inlet, the smaller its radial size is, so that the fluid at the volute medium inlet can flow evenly in the circumferential direction under the diversion of the guide cone, and then evenly enter between the blades.
- the base and the volute are connected through threads, so that the axial position of the base relative to the volute can be accurately adjusted to accurately cooperate with the moving magnetic ring on the rotor.
- a number of protrusions 1212 are provided on the outer end surface of the annular body 12 and the outer end surface of the base body (only the protrusions on the outer end surface of the annular body are shown in the figure).
- the inner edge side extends toward the outer edge side, and the protrusion 1212 has a predetermined angle with the radial direction. The distance between adjacent protrusions becomes smaller closer to the inner edge side, and the protrusion 1212 has an internal spiral structure.
- a dynamic pressure liquid floating bearing is formed between the outer end surface of the annular body and the first annular shell, and between the outer end surface of the base body and the second annular shell.
- the height of the protrusion 1212 is lower as it approaches the inner edge, and the above technical effect can also be achieved, as shown in Figure 7 .
- a first auxiliary channel is formed between the outer peripheral surface and outer end surface of the annular body and the corresponding inner wall of the volute, and between the outer peripheral surface and outer end surface of the annular packaging cavity and the corresponding inner wall of the volute, and A second auxiliary channel is formed between the inner peripheral wall 113 of the packaging cavity and the cover body 24 .
- the rotor is suspended in the middle of the volute 200 and rotates at high speed.
- the blades between the annular body 12 and the base 11 and the inner wall of the volute 200 constitute the main flow channel of the pump. Blood flows in from the medium inlet and passes through the central through hole of the annular body. It enters the main channel between the blades, and after being accelerated by the rotation of the blades, enters the main channel inside the volute, and flows out of the volute through the medium outlet.
- the annular shell opposite to the end faces of the annular body and the base body is made of ceramic material, and its surface is hard and smooth.
- the thickness of the first magnet in the rotor can be thinner, and the thickness of the outer end wall (cover plate) of the annular body 12 and the base body 11 is also correspondingly thinned, thereby reducing the size of the volute.
- the length of the internal return flow channel is also correspondingly thinned.
- the outer end surface of the annular body and the outer end surface of the base body both have a predetermined angle with the horizontal plane. From the outside inward, the distance between the outer end surface and the horizontal plane increases, that is, the outer end faces of the annular body and the base body are concave inward.
- the upper and lower outer end surfaces of the rotor have inward tapered surfaces. Therefore, the outer gap of the auxiliary channel formed between the outer end surface and the inner wall of the volute is smaller, and the inner gap is larger. In this way, the shear force of the blood passing through the smaller outer gap area is relatively large. High but fast flow rate and short transit time.
- the relative flow rate is low but the shear force is also low, which minimizes the possibility of hemolysis and thrombosis.
- the diameters of the rotor and volute can be smaller. Small, the requirements for motor speed and torque can be lower, thereby reducing the volume of the volute/rotor, and realizing the miniaturization of the centrifugal pump under the same output capacity.
- the above position sensor can be a Hall sensor or an eddy current sensor, as long as it can detect the axial position of the rotor body.
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- Heart & Thoracic Surgery (AREA)
- Cardiology (AREA)
- Biomedical Technology (AREA)
- Anesthesiology (AREA)
- Mechanical Engineering (AREA)
- Hematology (AREA)
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Abstract
一种磁悬浮型离心泵,包括蜗壳(200)、静磁环(22)和转子(100),蜗壳(200)具有悬浮腔、介质进口和介质出口,转子(100)位于悬浮腔内部,静磁环(22)固定于蜗壳;转子(100)包括转子本体、定位于转子本体的动磁环(16)和至少两个叶片(13);动磁环(16)与静磁环(22)同轴且嵌套配置以限制转子本体与蜗壳(200)的径向位置;转子本体固定有磁钢组件(14);转子本体还固定有磁性件(17);蜗壳(200)封装有与磁钢组件(14)相对设置的驱动线圈组件(21),驱动线圈组件(21)与磁钢组件(14)配合以使转子本体周向转动;蜗壳(200)固定有磁浮线圈组件(27),当磁浮线圈组件(27)通电时,磁性件(17)与磁浮线圈组件(27)产生轴向力。通过动磁环(16)和静磁环(22)之间的磁力作用可以实现转子(100)的全悬浮运转,减小了发热、磨损并最大限度的降低了产生血栓和对血细胞造成碾压破坏的可能性,转子(100)的旋转驱动和轴向位置控制完全独立,控制逻辑简单。
Description
本申请要求2022年05月23日提交中国专利局、申请号为202210565543.2、申请名称为“一种磁悬浮型离心泵”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及减振技术领域,特别涉及一种磁悬浮型离心泵。
心力衰竭(英文Heart failur,中文简称心衰),通俗来说即是自然心脏无法泵出维持全身血液循环的足够血流。据世界卫生组织WTO统计表明,约有15%~20%的人会患有不同程度的心衰,65岁以上因心衰而住院的人数占总住院人数50%以上,同时5年后病死率超过50%。对于心衰患者来说,只有保守药物治疗、心脏移植和心室辅助三种治疗途径。药物治疗的效果较差,心脏移植由于供体受限非常困难,因此心室辅助装置(英文全称为Ventricular Assist Device,VAD)成为全世界公认的各类终末期心衰最有效的治疗途径。心室辅助装置的主要部件是一个血泵(英文全称为Blood Pump)。一般是将血泵的流入管道与人心脏左心室或右心室相连,通过流出管道与主动脉或肺动脉相连,泵与控制驱动器(带有电力供应设备)相连,由控制驱动器控制血泵输出具有一定压力(一般范围80~120mmHg)和流量(一般范围为2~10L/min)的血液,分担人体正常活动对人心脏的功率需求。
鉴于血泵的使用环境限制,在满足功能前提下,如何使血泵具有集成度高且体积小的特性,是本领域内技术人员始终关注的技术问题。
申请内容
本申请的目的为提供一种体积小、结构紧凑的磁悬浮型离心泵。
本申请提供一种磁悬浮型离心泵,包括蜗壳、静磁环和转子;
所述蜗壳具有悬浮腔、介质进口和介质出口,所述转子位于所述悬浮腔内部,所述静磁环固定于所述蜗壳,
所述转子包括转子本体、定位于所述转子本体的动磁环和至少两个叶片;所述动磁环与所述静磁环同轴且嵌套配置以限制所述转子本体与所述
蜗壳的径向位置;
所述转子本体固定有磁钢组件,所述磁钢组件包括N个沿周向排布的第一磁钢,所有所述第一磁钢的磁极交错布置;所述转子本体还部固定有磁性件,所述磁性件包括磁环和铁芯至少一者;
所述蜗壳封装有与所述磁钢组件相对设置的驱动线圈组件,所述驱动线圈组件与所述磁钢组件配合以使所述转子本体周向转动;所述蜗壳固定有磁浮线圈组件,当所述磁浮线圈组件通电时,所述磁性件与所述磁浮线圈组件产生轴向力。
可选的,还包括位置传感器,用于检测所述转子本体的轴向位置;
或者/和,相邻所述第一磁钢紧密贴合,或者所述磁钢组件还包括横向导磁磁钢,所述导磁磁钢位于两所述第一磁钢之间,所有所述导磁磁钢和所有所述第一磁钢形成Halbach磁钢阵列。
可选的,所述磁钢组件和所述磁性件分别设置于所述转子本体的第一端部和第二端部,所述驱动线圈组件和所述磁浮线圈组件分别设置于所述蜗壳的第一端部和第二端部。
可选的,所述蜗壳的内腔中具有第一环形壳体和第二环形壳体,所述第一环形壳体、所述第二环形壳体分别位于所述蜗壳的第一端部和第二端部,所述第一环形壳体与所述蜗壳围成封装所述驱动线圈的第一密封腔,所述第二环形壳体与所述蜗壳围成封装所述磁浮线圈组件的第二密封腔,所述悬浮腔形成于位于所述第一环形壳体和所述第二环形壳体之间,所述第一环形壳体和所述第二环形壳体均为陶瓷结构,所述驱动线圈组件贴靠所述第一环形壳体布置,所述磁浮线圈贴靠所述第二环形壳体布置。
可选的,所述转子本体包括环形体和座体,二者沿轴向固连布置,并且所述环形体和所述座体之间具有出液口,所述环形体的中心通孔连通所述出液口,所述中心通孔与所述介质进口同轴,各所述叶片位于所述环形体和所述座体之间,所述环形体内部封装有所述磁钢组件,所述动磁环和所述磁性件封装于所述座体内部。
可选的,所述座体具有环状封装腔,所述动磁环套设于所述环状封装腔的内环壁,封装于所述座体的磁性件位于所述动磁环***,沿径向,所述环状封装腔中间区域的轴向高度大于所述边缘区域的轴向高度。
可选的,还包括底座和罩体,所述罩体具有一端开口的柱筒以及连接于所述柱筒另一端的导流锥,所述柱筒的开口周向密封扣合于所述底座,所述静磁环通过螺纹部件固定于所述底座且位于所述柱筒内部,并且所述底座与所述蜗壳螺纹密封连接且与所述介质进口同轴,所述导流锥穿过所述环状封装腔的中心孔且朝向所述介质进口凸出。
可选的,所述环形体的外周面、外端面与所述蜗壳相应内壁之间形成第一辅助通道,所述环状封装腔的外周面和外端面二者均与蜗壳相应内壁之间,以及所述环状封装腔的内周壁与所述罩体之间形成第二辅助通道,并且所述环形体的外端面和座体的外端面均与水平面具有预定夹角,由外向内,所述外端面距离水平面的距离增大。
可选的,所述环形体和所述座体的外端面均设置有若干凸起,所述凸起自内缘侧向外缘侧延伸,并且所述凸起与径向具有预定夹角,相邻凸起之间的距离越靠近内缘侧越小或者所述凸起越靠近内缘高度越低;
可选的,所述转子为离心式全封闭转子结构,所述叶片为后弯式叶片,所述磁钢组件和所述磁性件分别设置于所述转子本体的第一端部和第二端部,所述叶片位于所述磁钢组件和所述磁性件之间;
或者/和,所述磁性件包括磁环。
本申请中转子的旋转驱动和轴向位置控制是完全独立的,且分别位于转子本体的两侧,控制逻辑比较简单。并且,本申请中通过动磁环和静磁环之间的磁力作用可以实现转子的全悬浮运转,这样转子与蜗壳(相当于定子)之间没有机械接触,减小了发热、磨损并最大限度的降低了产生血栓和对血细胞造成碾压破坏的可能性:转子的径向悬浮限位可以依靠动磁环和静磁环实现。
图1为本申请一种实施例中磁悬浮型离心泵的三维结构示意图;
图2为磁悬浮型离心泵的剖视三维图;
图3为图1的剖视结构示意图;
图4为本申请一种实施例中转子的结构示意图;
图5为图4所示转子的另一视角剖视的示意图;
图6为本申请一种实施例中转子本体的结构示意图;
图7为本申请另一实施例中转子的示意图;
图8为本申请再一种实施例中转子的示意图。
其中,图1至图8中:
100转子;11座体;111下盖板;112环状密封腔;113内周壁;12环
形体;121上盖板;1211外端面;1212凸起;13叶片;14磁钢组件;15磁性部件;16动磁环;17磁性件;
200蜗壳;201第一蜗壳;202第二蜗壳;203第一环形壳体;204第
二环形壳体;21驱动线圈组件;211驱动线圈;212工作铁芯;22静磁环;23底座;24罩体;241柱筒;242导流锥;26位置传感器;27磁浮线圈组件;271磁浮线圈;272磁浮铁芯;
300进口管;
400出口管;
1a第一辅助流道;1b第二辅助流道;100a出液口。
100转子;11座体;111下盖板;112环状密封腔;113内周壁;12环
形体;121上盖板;1211外端面;1212凸起;13叶片;14磁钢组件;15磁性部件;16动磁环;17磁性件;
200蜗壳;201第一蜗壳;202第二蜗壳;203第一环形壳体;204第
二环形壳体;21驱动线圈组件;211驱动线圈;212工作铁芯;22静磁环;23底座;24罩体;241柱筒;242导流锥;26位置传感器;27磁浮线圈组件;271磁浮线圈;272磁浮铁芯;
300进口管;
400出口管;
1a第一辅助流道;1b第二辅助流道;100a出液口。
在本申请的描述中,需要说明的是,术语“左”、“右”、“上”、“下”、“内”、“外”等指示的方位或者位置关系为基于附图所示的方位或位置关系,仅是为了便于描述技术的简洁,而并不是指示或者暗示所指的装置或元件必须具有特定的方位、特定的方位构造和操作,因此不能理解对本申请的限制。此外,术语“第一”、“第二”等词仅是为了便于描述结构和/或功能相同或者相类似的两个以上的结构或者部件,并不表示对于顺序和/或重要性的某种特殊限定。
不失一般性,本文以磁悬浮型离心泵应用于心脏泵血为例介绍技术方案和技术效果,本领域内技术人员应当理解,本申请所述的磁悬浮型离心泵虽然是在研究血泵的基础上提出技术方案,但是本文中的磁悬浮型离心泵不局限于应用于心脏泵血,应用于其他领域依旧在本文的保护范围之内。
为了使本领域的技术人员更好地理解本申请的技术方案,下面结合附图和具体实施例对本申请作进一步的详细说明。
请参考图1至图3,图1为本申请一种实施例中磁悬浮型离心泵的三维结构示意图;图2为磁悬浮型离心泵的剖视三维图;图3为图1的剖视结构示意图。
本申请提出了一种磁悬浮型离心泵,包括蜗壳、静磁环和转子,蜗壳具有悬浮腔、介质进口和介质出口,转子位于悬浮腔内部。
其中,蜗壳可以包括第一蜗壳201和第二蜗壳202,二者围成转子的安装空间,第一蜗壳201和第二蜗壳202可以可拆卸安装,以便于转子等零部件的安装及维护。第一蜗壳201上可以设置有介质进口,介质出口可以由第一蜗壳201和第二蜗壳202上的相应结构共同围成。介质进口安装有进口管300,介质出口安装有出口管400,第一蜗壳201、第二蜗壳202、进口管300和出口管400可以均为钛合金材质。
请进一步参考图4和图5,图4为本申请一种实施例中转子的结构示意图;图5为图4所示转子的另一视角的示意图。
本申请中的转子包括转子本体、叶片13、动磁环16、磁性件17和磁钢组件14。
其中,转子本体主要为组成转子的其他零部件的安装提供安装基础以及与蜗壳配合装配。后文将具体介绍转子本体的一种具体结构。动磁环16、叶片13、磁性件17和磁钢组件14均安装于转子本体,叶片13的数量可以为两个或者两个以上,即叶片的数量至少为两个,各叶片沿周向分布,叶片13可以为后弯式叶片,后弯式叶片在获得最优化的流体效率、剪切力和流线分布,在相同的输出流量、压力的要求下,转子和蜗壳的直径可以更小,对电机转速和扭矩的要求可以更低,可以减小蜗壳、转子和电机的体积,在相同输出能力的条件下能够实现泵的小型化,并最大程度的降低了溶血和血栓发生的可能性。
其中叶片13的数量可以根据具体泵体积而定,通常可以为3至7片,例如一种具体示例中叶片的数量为5片。
当然,叶片13也可以为等厚度叶片或者直叶片,只要能够满足使用需求即可。
蜗壳200上安装有静磁环22,静磁环22与动磁环16同轴且嵌套配置以限制转子100与蜗壳200的径向位置。静磁环22和动磁环16二者可以均包括为沿轴向布置的两个或者两个以上的环形磁铁。图3中示出了静磁环22和动磁环16均具有三个环形磁环的具体示例,动磁环16嵌套与静磁环22的***。当然静磁环22和动磁环16中环形磁环的数量不局限于本文
描述,还可以为其他数值。
工作时,动磁环16和静磁环22限定转子相对蜗壳200径向位置的原理:转子的径向悬浮依靠动磁环和静磁环之间的斥力实现,如上所述转子本体安装有一组动磁环;蜗壳安装有一组静磁环;动磁环和静磁环二者构成永磁径向悬浮轴承。静磁环可以通过底座23与蜗壳200之间的精密螺纹调节轴向位置,当理想情况下,调节静磁环22的位置,当转子本体沿轴向悬浮于蜗壳悬浮腔的中间时,静磁环22与动磁环16的轴向位置刚好对齐;此时动磁环16和静磁环22形成的永磁径向悬浮轴承的径向刚度为最大,而轴向力为0。
本申请所提供的转子本体的第一端部固定有磁钢组件14,磁钢组件14包括N个沿周向排布的第一磁钢141,所有第一磁钢141的磁极交错布置,请参考图4,磁钢组件中第一磁钢按照N极、S极交替布置形成一周。磁钢组件14中各磁钢可以封装于转子本体的内部。其中在一种示例中第一磁钢141之间可以紧密贴合,组成一个满极弧的磁环,这样与蜗壳200上安装的驱动线圈组件21形成的盘式电机可以获得较大的电机效率。
当然,磁钢组件14还可以包括横向导磁磁钢18,导磁磁钢18位于第一磁钢141之间,即在磁极交错的第一磁钢141之间布置同等数量互斥的横向导磁磁钢18,例如10组交错第一磁钢和导磁磁钢组成Halbach磁钢阵列(4-16偶数组均可,10组为一种可选的方案),这种磁钢阵列可以起到聚磁的效果,在同等的磁钢体积下提高了电机气隙之间的磁密,从而进一步提高了电机效率。
当然,磁钢组件14的设置不局限于本文所述的方式,还可以为其他方式,只要能够实现本文所述的功能即可。
相应地,涡壳200与转子安装磁钢组件14相对应的第一端部封装有驱动线圈组件21,其中驱动线圈组件21可以包括驱动线圈211和工作铁芯212。工作时,驱动线圈211通入电流产生磁场,工作铁芯212对驱动线圈211所产生的磁场起到放大功能,安装于转子本体的磁钢组件14的各磁极交错布置的第一磁钢141将会产生旋转力,带动转子本体转动。驱动线圈组件21与转子本体内部安装的磁钢组件14形成了盘式电机。
磁浮线圈组件27通电时,磁性件17与磁浮线圈组件27产生轴向力,
用于控制转子本体的轴向位置。通过调节磁浮线圈组件27的电流方向,能够实现磁浮线圈组件271与磁性件17之间力方向的改变。磁浮线圈组件27可以包括磁浮线圈271和磁浮铁芯272。其中转子本体的轴向位置可以通过位置传感器获知。
该实施方式中,转子的旋转驱动和轴向位置控制是完全独立的,且分别位于转子本体的两侧,控制逻辑比较简单。并且,本申请中通过动磁环16和静磁环22之间的磁力作用可以实现转子的全悬浮运转,这样转子100与蜗壳200(相当于定子)之间没有机械接触,减小了发热、磨损并最大限度的降低了产生血栓和对血细胞造成碾压破坏的可能性:转子100的径向悬浮限位可以依靠动磁环和静磁环实现。
在这一种具体示例中,蜗壳200的内腔中具有第一环形壳体203和第二环形壳体204,第一环形壳体203、第二环形壳体204分别位于蜗壳的第一端部和第二端部,第一环形壳体203与蜗壳围成封装驱动线圈的第一密封腔,第二环形壳体与蜗壳围成封装磁浮线圈组件的第二密封腔,悬浮腔形成于位于第一环形壳体和第二环形壳体之间,第一环形壳体203和第二环形壳体204均为陶瓷结构,驱动线圈组件21贴靠第一环形壳体203布置,磁浮线圈271贴靠第二环形壳体204布置。
各环形壳体可以通过粘接或者其他方式与蜗壳固定。
陶瓷材料与血液的相容性较佳,陶瓷材料十分坚硬且绝缘,这样环形壳体的壁厚可以比较薄并且驱动线圈可以紧贴内壁,从而极大的降低了驱动线圈与第一磁钢之间的气隙且完全消除了涡流损失,第一磁钢可采用Halbach阵列排布,提高了电机的效率,在保持最大输出能力不变的前提下实现了血泵的小型化。因陶瓷绝缘特性同时可以最大程度的降低驱动线圈对蜗壳内流动的血液产生漏电流的风险,并消除了驱动线圈组件和第一磁钢组件形成盘式电机运行受外部电场干扰的可能性。例如:患者在接受电击/电复率/电刀切割治疗时,磁悬浮型离心泵依然能正常工作。
在一种示例中,转子本体包括环形体12和座体11,二者沿轴向固连布置,各叶片位于环形体12和座体11之间,环形体12和座体11之间具有出液口,出液口可以位于两叶片之间,环形体12的中心通孔连通出液口100a,环形体12和座体11内部均封装有磁钢组件,动磁环16封装于座体
11内部。环形体12和座体二者沿轴向固连布置,并且环形体12和座体11之间具有出液口,环形体12的中心通孔连通出液口,环形体12的中心通孔与介质进口同轴。其中出液口100a的数量可以为多个,沿周向均匀布置,具体数量可以根据具体产品而定,本文不做限定。
具体地,座体具有环状封装腔,动磁环套设于环状封装腔的内环壁,封装于座体的磁性件位于动磁环***,沿径向,环状封装腔中间区域的轴向高度大于边缘区域的轴向高度。
这样可以尽量减少封装腔对泵内部流体空间的占据,有利于结构紧凑。
为了方便安装,环状封装腔可以由以下方式形成,座体上设置环形凹槽,下盖板111盖合于环形凹槽的槽口形成密封腔室。同理,环形体上安装磁钢组件的密封腔也可以采用设置环形凹槽和上盖板121配合密封的方式形成。
本申请中的转子可以为离心式全封闭式转子,当离心式泵工作时,大量血液通过流入道流入离心泵内部,经过转子离心叶片加速后,由流出道流出,将血液注入主动脉,为全身的血液循环提供压力和流量。转子离心叶片可以为中空结构。
上述各实施例中静磁环可以通过以下方式安装于蜗壳内部。
在一种示例中,磁悬浮型离心泵还可以进一步底座和扣合于底座23的罩体24,罩体24与底座密封固定,静磁环通过螺纹部件固定于底座,螺纹部件可以为螺钉或者螺栓或者螺杆等部件。并且静磁环安装于罩体和底座形成的安装空间,蜗壳的第二端部设置有安装通孔,安装通孔与介质进口同轴,底座23螺纹密封连接于安装通孔。罩体24包括具有一端开口的柱筒241以及连接于柱筒另一端的导流锥242,静磁环22位于柱筒241内部,导流锥242穿过座体11的中心孔且朝向介质进口凸出。导流锥242越靠近介质进口径向尺寸越小,这样蜗壳介质进口的流体可以在导流锥的分流下均匀向周向流动,进而均匀进入叶片之间。
上述实施例中底座与蜗壳之间通过螺纹连接,可以精确调节底座相对蜗壳的轴向位置,以与转子上的动磁环精确配合。
请参考图6和图7,上述各实施例中,环形体12的外端面和座体的外端面均设置有若干凸起1212(图中仅示出环形体外端面的凸起),凸起自
内缘侧向外缘侧延伸,并且凸起1212与径向具有预定夹角,相邻凸起之间的距离越靠近内缘侧越小,凸起1212呈内螺旋结构。这样环形体的外端面与第一环形壳体之间、座体的外端面与第二环形壳体之间形成动压液浮轴承。当转子在轴向受到极大的干扰,一端接近到该侧的环形壳体时,动压液浮轴承可以提供额外的向中心的恢复力,从而提高叶轮沿轴向的稳定性。
当然,凸起1212越靠近内缘高度越低,同样能够实现上述技术效果,如图7所示。
在一种具体实施例中,环形体的外周面、外端案与蜗壳相应内壁之间形成第一辅助通道,环状封装腔的外周面、外端面与蜗壳相应内壁之间,以及环状封装腔的内周壁113与罩体24之间形成第二辅助通道。
工作时,转子在蜗壳200中间悬浮高速旋转,环形体12和座体11之间的叶片与蜗壳200的内壁构成泵的主要流道,血液从介质进口流入,通过环形体的中心通孔进入叶片间的主流道,经叶片的旋转加速后,进入蜗壳内部的主流道,通过介质出口流出蜗壳。
同时,进入蜗壳200内部主流道的血液,有一小部分分别通过第一辅助通道和第二辅助通道重新回流至转子本体的入口,重新进入叶片之间经加速后流入蜗壳内部。通过上述设计,进入离心泵内所有流经血液的流道均为单向流动,不存在静止或回流的区域,从而最大程度降低血栓形成的可能。
同时,如上所述因与环形体、座体的端面相对的环形壳体为陶瓷材料,其表面坚硬且光滑,在转子与环形壳体意外接触时,降低了环形壳体表面被破坏的可能。因电机效率更高,因此在相同条件下,转子内第一磁钢的厚度可以更薄,环形体12和座体11外端壁(盖板)的厚度也对应减薄,从而降低了蜗壳内回流流道的长度。
同时,并且环形体的外端面和座体的外端面均与水平面具有预定夹角,由外向内,外端面距离水平面的距离增大,即环形体和座体的外端面是向内凹陷的,转子上下外端面有向内的锥面,因此形成于外端面与蜗壳内壁之间的辅助通道外侧间隙较小,内侧的间隙较大,这样血液经过外侧间隙较小区域是剪切力相对较高但流速快通过时间短,经过内侧间隙较大区域时低相对流速低但是剪切力也较低,最大程度降低了溶血和血栓发生的可
能性,这样就有条件将辅助通道的间隙相对减小,降低了离心泵的回流损失,提高了流体效率,在离心泵相同的输出流量/压力的要求下,转子和蜗壳的直径可以更小、对电机转速和扭矩的要求可以更低,从而减小了蜗壳/转子体积,在相同输出能力的条件下实现了离心泵的小型化。
上述位置传感器可以为霍尔传感器,也可以为电涡流传感器,只要能够实现转子本体轴向位置的检测即可。
以上对本申请所提供的一种磁悬浮型离心泵进行了详细介绍。本文中应用了具体个例对本申请的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本申请的方法及其核心思想。应当指出,对于本技术领域的普通技术人员来说,在不脱离本申请原理的前提下,还可以对本申请进行若干改进和修饰,这些改进和修饰也落入本申请权利要求的保护范围内。
Claims (10)
- 一种磁悬浮型离心泵,其特征在于,包括蜗壳、静磁环和转子;所述蜗壳具有悬浮腔、介质进口和介质出口,所述转子位于所述悬浮腔内部,所述静磁环固定于所述蜗壳,所述转子包括转子本体、定位于所述转子本体的动磁环和至少两个叶片;所述动磁环与所述静磁环同轴且嵌套配置以限制所述转子本体与所述蜗壳的径向位置;所述转子本体固定有磁钢组件,所述磁钢组件包括N个沿周向排布的第一磁钢,所有所述第一磁钢的磁极交错布置;所述转子本体还部固定有磁性件,所述磁性件包括磁环和铁芯至少一者;所述蜗壳封装有与所述磁钢组件相对设置的驱动线圈组件,所述驱动线圈组件与所述磁钢组件配合以使所述转子本体周向转动;所述蜗壳固定有磁浮线圈组件,当所述磁浮线圈组件通电时,所述磁性件与所述磁浮线圈组件产生轴向力。
- 如权利要求1所述的磁悬浮型离心泵,其特征在于,还包括位置传感器,用于检测所述转子本体的轴向位置;或者/和,相邻所述第一磁钢紧密贴合,或者所述磁钢组件还包括横向导磁磁钢,所述导磁磁钢位于两所述第一磁钢之间,所有所述导磁磁钢和所有所述第一磁钢形成Halbach磁钢阵列。
- 如权利要求1所述的磁悬浮型离心泵,其特征在于,所述磁钢组件和所述磁性件分别设置于所述转子本体的第一端部和第二端部,所述驱动线圈组件和所述磁浮线圈组件分别设置于所述蜗壳的第一端部和第二端部。
- 如权利要求1至3任一项所述的磁悬浮型离心泵,其特征在于,所述蜗壳的内腔中具有第一环形壳体和第二环形壳体,所述第一环形壳体、所述第二环形壳体分别位于所述蜗壳的第一端部和第二端部,所述第一环形壳体与所述蜗壳围成封装所述驱动线圈的第一密封腔,所述第二环形壳体与所述蜗壳围成封装所述磁浮线圈组件的第二密封腔,所述悬浮腔形成于位于所述第一环形壳体和所述第二环形壳体之间,所述第一环形壳体和所述第二环形壳体均为陶瓷结构,所述驱动线圈组件贴靠所述第一环形壳 体布置,所述磁浮线圈贴靠所述第二环形壳体布置。
- 如权利要求1至3任一项所述的磁悬浮型离心泵,其特征在于,所述转子本体包括环形体和座体,二者沿轴向固连布置,并且所述环形体和所述座体之间具有出液口,所述环形体的中心通孔连通所述出液口,所述中心通孔与所述介质进口同轴,各所述叶片位于所述环形体和所述座体之间,所述环形体内部封装有所述磁钢组件,所述动磁环和所述磁性件封装于所述座体内部。
- 如权利要求5所述的磁悬浮型离心泵,其特征在于,所述座体具有环状封装腔,所述动磁环套设于所述环状封装腔的内环壁,封装于所述座体的磁性件位于所述动磁环***,沿径向,所述环状封装腔中间区域的轴向高度大于所述边缘区域的轴向高度。
- 如权利要求6所述的磁悬浮型离心泵,其特征在于,还包括底座和罩体,所述罩体具有一端开口的柱筒以及连接于所述柱筒另一端的导流锥,所述柱筒的开口周向密封扣合于所述底座,所述静磁环通过螺纹部件固定于所述底座且位于所述柱筒内部,并且所述底座与所述蜗壳螺纹密封连接且与所述介质进口同轴,所述导流锥穿过所述环状封装腔的中心孔且朝向所述介质进口凸出。
- 如权利要求7所述的磁悬浮型离心泵,其特征在于,所述环形体的外周面、外端面与所述蜗壳相应内壁之间形成第一辅助通道,所述环状封装腔的外周面和外端面二者均与蜗壳相应内壁之间,以及所述环状封装腔的内周壁与所述罩体之间形成第二辅助通道,并且所述环形体的外端面和座体的外端面均与水平面具有预定夹角,由外向内,所述外端面距离水平面的距离增大。
- 如权利要求5所述的磁悬浮型离心泵,其特征在于,所述环形体和所述座体的外端面均设置有若干凸起,所述凸起自内缘侧向外缘侧延伸,并且所述凸起与径向具有预定夹角,相邻凸起之间的距离越靠近内缘侧越小或者所述凸起越靠近内缘高度越低;
- 如权利要求1或2所述的磁悬浮型离心泵,其特征在于,所述转子为离心式全封闭转子结构,所述叶片为后弯式叶片,所述磁钢组件和所述磁性件分别设置于所述转子本体的第一端部和第二端部,所述叶片位于 所述磁钢组件和所述磁性件之间;或者/和,所述磁性件包括磁环。
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- 2023-05-22 WO PCT/CN2023/095432 patent/WO2023226910A1/zh unknown
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