EP3475577A1 - Roue à aubes et pompe centrifuge équipée d'une telle roue à aubes - Google Patents

Roue à aubes et pompe centrifuge équipée d'une telle roue à aubes

Info

Publication number
EP3475577A1
EP3475577A1 EP17732920.8A EP17732920A EP3475577A1 EP 3475577 A1 EP3475577 A1 EP 3475577A1 EP 17732920 A EP17732920 A EP 17732920A EP 3475577 A1 EP3475577 A1 EP 3475577A1
Authority
EP
European Patent Office
Prior art keywords
main
blades
paddle wheel
blade
centrifugal pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP17732920.8A
Other languages
German (de)
English (en)
Inventor
Roland GRAEFE
Andreas Henseler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reinheart GmbH
Original Assignee
Reinheart GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reinheart GmbH filed Critical Reinheart GmbH
Publication of EP3475577A1 publication Critical patent/EP3475577A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
    • 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
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
    • A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
    • 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
    • A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor 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
    • A61M60/80—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
    • A61M60/804—Impellers
    • A61M60/806—Vanes or blades
    • 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
    • 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
    • A61M60/818—Bearings
    • A61M60/82—Magnetic bearings
    • A61M60/822—Magnetic bearings specially adapted for being actively controlled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2216—Shape, geometry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous

Definitions

  • the invention relates to a paddle wheel with reduced
  • Stagnation areas can be operated and on a centrifugal pump with such a paddle wheel.
  • Fluid pumps are used for a wide variety of engineering applications for transporting fluids through a transport system from one location to another.
  • Liquid pumps can be used as centrifugal pumps in ventricular assist devices (VADs) for long-term support of a cardiac patient and in this case comprise a paddle wheel which pumps the blood of the respective patient from an inlet to an outlet opening.
  • VADs ventricular assist devices
  • the blood pump is used in its main application as a Left Ventricular Assist Device (LVAD) between the left ventricle and the aorta to support the large circulatory system
  • LVAD Left Ventricular Assist Device
  • rhythmically pumping devices have been replaced by devices that deliver a LVAD
  • Implantation replaced. Blood pumps can be unlike ordinary ones
  • Liquid pumps in other technical fields are not operated at a constant operating point with a constant delivery volume over time, but must be suitable for supporting a widely varying blood flow in a patient, which is also strongly influenced by external time-varying influences.
  • Left ventricular assist devices should be as pressure-sensitive as possible by strongly varying the pressure difference between the left ventricle and the aorta with a high change in the left ventricle Volume flow through the blood pump to react.
  • LVADs Left ventricular assist devices
  • Known advantages of this behavior are the transmission of a residual pulse to physiological values, the mimic volume balance between small and large blood circulation analogous to the Frank-Starling mechanism and a low risk of entrainment of the ventricular wall in the inlet of the pump.
  • the pump design must be designed so that the risk of a pump thrombus can be reduced as much as possible. Such a
  • Thrombus is caused by activation of the coagulation system and concomitant formation of stagnation areas in the blood pump.
  • the area within the blood pump is referred to as stagnation area, in which only insufficient or, in extreme cases, no blood is present in the pump
  • Centrifugal pumps can not be lowered to physiologically small enough levels. Thus, it is essential to avoid stagnation areas, or at least to minimize their extent, where activated platelets can deposit and allow growth of a thrombus. The same applies to the conveying and pumping of thixotropic (pseudoplastic) liquids in which the viscosity due to ongoing mechanical
  • a thixotropic fluid Decreases stress and only increases after completion of stress again. In areas with a correspondingly high fluid throughput, a thixotropic fluid remains fluid and is easy to transport
  • Thixotropic liquids are, for example, sand-water mixtures, drilling fluids, lacquers and emulsion paints after addition of silica gels, printing inks, spray paints, shaving cream, margarine, toothpaste or ketchup.
  • circular disc having a central aperture and a first surface extending therefrom to a radially outer edge, wherein on the first surface there are a plurality of main blades having a pressure side and a suction side and extending from the central aperture as a starting point to the edge end point, respectively between two adjacent ones
  • Main vane are arranged in each case one extending from a starting point in the direction of the edge to an end point intermediate vane, wherein the respective starting point of the intermediate vanes has a distance to the center of the first surface greater than the radius of the central opening and the intermediate vanes each closer to the pressure side of the during rotation of
  • Paddle wheel of the intermediate blade trailing main blade are arranged as on the suction side of this intermediate blade leading main blades.
  • the term "paddle wheel” includes a suitably shaped circular disc as a support for the paddles, which disc has a suitably shaped first surface on which the paddles are disposed, this first surface being capable of providing a suitable contour in a direction parallel to the paddle
  • Owned rotation axis for example, the surface of the paddle wheel dome-shaped, plan (flat) or be designed with a different contour.
  • the first surface may, for example, as well as the disc be designed circular.
  • the blades for transporting a liquid may have any suitable shape in the radial direction of the
  • the main and / or intermediate blades may be between start point and Endpoint to have the same height above the first surfaces.
  • the height of the main and / or intermediate blades may be configured to have the same height between the starting point and end point relative to the surface of the impeller opposite the first surface.
  • extend designates the radial course of the main and intermediate blades on the first surface, the radial direction (radial profile) being the direction perpendicular to the axis of rotation, the starting point of a blade being the point on the respective one
  • Blade (or the edge of the blade), which has the smallest distance to the center of the first surface. Accordingly, the designated
  • the central opening may have any suitable shape and is preferably designed circular.
  • the diameter of the central opening denotes, in the case of non-circular central openings, the mean distance between opposite points on the edge of the central opening.
  • the radius of the central opening is half the average distance of opposite points on the edge of the central opening.
  • the pressure side of a blade refers to the side of the blade perpendicular to the first surface, which upon rotation presses against the liquid to transport it.
  • the corresponding other side of the blade perpendicular to the first surface is referred to as the suction side.
  • the pressure and / or suction sides of the main and / or intermediate blades can be seen in the direction perpendicular to the first surface plan or have a suitable contour.
  • the pressure and suction sides are perpendicular to the first surface plan, so executed without buckling. Parallel to the first surface have the main and
  • Blade a curved contour. This can be designed the same or different for the respective pressure and suction sides.
  • the contours of the pressure and suction side are at least parallel to the first surface, the main and intermediate blades preferably have no sharp edges at their starting points and end points, but are shaped so that the first derivative of the
  • Advance blades designate the blades that reach a given point in time as the paddle wheel rotates, rather than the blades behind the leading one
  • the blades can thereby be glued or welded to the paddle wheel.
  • For the main and intermediate blades have a suitable thickness and shape between pressure and suction side.
  • the paddle wheel with blades is integrally molded from one piece, for example by means of machining technology.
  • the overload range refers to the operation of the centrifugal pump with such a paddle wheel at a
  • Centrifugal pump with such a paddle wheel at a flow rate below the volume flow at the optimum operating point.
  • turbulences are induced, which counteracts the stagnation areas and prevents or at least minimizes their size.
  • the paddle wheel according to the invention makes it possible to provide a
  • Centrifugal pump which is efficient with the lowest possible losses over the Operating range can be operated and in which the paddle wheel avoids stagnation areas in the pump at the same time.
  • a first segment of a circle between the center of the first surface located on the intended axis of rotation and the endpoints of adjacent main blades are a main vane opening angle and a second circular segment between the center and end of the respective main vane and the endpoint of the vane located downstream of the main vane spanned an intermediate vane opening angle, wherein the vane opening angle between 0.55 and 0.70 of the corresponding main vane opening angle.
  • Paddle itself leads to an adjustment of the delivery volume as a function of the pressure applied to the inlet. In this positioning of the
  • the size of the stagnation areas also further limited.
  • the intermediate vane opening angle is between 0.58 and 0.62 of the corresponding main vane opening angle.
  • the main vane opening angle and the vane opening angle are the same for all main and intermediate vanes.
  • a corresponding symmetrical alignment of the blades at the edge of the blade wheel leads to improved results in one
  • the main and intermediate blades are shaped so that the trailing intermediate blade upon rotation of the
  • Paddle wheel around the blade opening angle to cover with a Position of the leading main blade can be brought before the rotation of the intermediate vane opening angle.
  • a corresponding symmetrical positioning of the blades not only at the edge of the paddle wheel leads to the best results in a corresponding centrifugal pump.
  • the starting points are all
  • the radius is between 60% and 90% of the radius of the first surface.
  • the intermediate blades have a much shorter length between the starting point and the end point than the main blades, since the end points of the main and intermediate blades can not go beyond the outer edge.
  • the intermediate blades are arranged in the outer region of the first surface to the outer edge, which due to the resulting flow dynamics to a significant
  • end points of the intermediate blades lie on the edge of the first surface.
  • all end points of all vanes (main and intermediate vanes) lie on the outer edge of the first surface, again reducing the size of the stagnant regions.
  • Blades curved backwards in the direction of rotation.
  • backward curved designates the curvature of the blades in the direction of the respective trailing blade. This alignment in the blade wheel enables an improved guidance of the flow in the direction of the outlet opening of a centrifugal pump.
  • the main blades and the intermediate blades are shaped so that they do not converge on the axis of rotation when extrapolating their course along the first surface. This alignment and shaping of the main blades results in improved flow of the flow from the central opening into the paddle wheel.
  • Centrifugal pump can be achieved. Such large blade outlet angles can be achieved with the same efficiency only with existing intermediate blades. By using the intermediate vanes, the reduced deflection and turbulence during operation can be reduced, which increases the efficiency of the pump.
  • the blade exit angle is between 60 degrees and 70 degrees.
  • the paddle wheel comprises at most five main blades and five intermediate blades. With too many blades friction losses, u.a. also the inlet losses at the central opening, too big and accordingly the efficiency of the centrifugal pump would decrease.
  • the paddle wheel has four main blades and four intermediate blades. With this number of blades, both the
  • the first circular disc comprises a second surface opposite to the first surface, in or on which a plurality of permanent magnets for non-contact rotation of the impeller are suitably arranged.
  • the paddle wheel can be driven without contact by a corresponding electromagnetic motor unit.
  • the paddle wheel comprises a second
  • first and second disks are plane-parallel disks. This makes it possible to produce a very compact centrifugal pump with good control properties for drive and storage.
  • the first and second disks have the same thickness.
  • On such a paddle wheel act fluid-related forces that do not or only slightly depending on the flow rate of the liquid. This is particularly advantageous when the paddle wheel is mounted without contact and driven and fluctuates the flow of liquid through the pump due to the application.
  • the invention further relates to a centrifugal pump for transporting a liquid comprising a housing having an inlet opening for the
  • paddle wheel with blades surrounds and the centrifugal pump is designed so that the paddle wheel can be rotated in the housing about a rotation axis, so that the liquid is transported from the inlet opening in the radial direction from a central opening in the paddle wheel on the paddle wheel to the outlet.
  • Inlet opening to the outlet opening is accomplished by the rotating blade wheel by means of the blades arranged thereon.
  • the centrifugal pump according to the invention with a paddle wheel according to the invention thus represents a centrifugal pump, which can be operated efficiently with the lowest possible losses over the operating range and in which the paddle wheel
  • the centrifugal pump is a blood pump and the fluid to be pumped is blood. While "normal" pumps are usually operated at always the same operating point, in blood pumps, the volume flow of the blood to be pumped by the blood pump during operation varies greatly, with the blood pumped through the blood pump
  • overload range Volumetric flow below a pump-specific optimum as a partial load range and above this optimum is referred to as overload range. While at high flow rates when operating in the overload range high friction losses for efficient operation (low losses) of the pump are to be avoided, for efficient operation in the partial load range for
  • the blood pump has a high pressure sensitivity.
  • the high pressure sensitivity is particularly advantageous for blood pumps because these blood pumps have no active speed adjustment during operation due to lack of control sensors and the required reliability.
  • the high pressure sensitivity also allows a pulse shape of the pumped blood in the bloodstream, which is closer to the normal state of the patient and thus can be measured as a normal pulse of the patient.
  • the liquid is a thixotropic liquid and the centrifugal pump is a delivery pump for such thixotropic liquids.
  • Thixotropic liquids are, for example, sand-water mixtures, drilling fluids, lacquers and emulsion paints after addition of silica gels, printing inks,
  • inventive feed pump with impeller according to the invention thus prevents clogging of such a pump when conveying (transporting) the thixotropic liquids.
  • the centrifugal pump comprises a motor unit for
  • Paddle wheel For example, the paddle wheel on a shaft as
  • the paddle wheel can also be supported by ball bearings.
  • the motor unit may be, for example, an electric motor that drives the shaft or the paddle wheel.
  • the rotation about an axis of rotation in the centrifugal pump is a non-contact rotation at least under normal conditions.
  • the motor unit may consist of a stator / rotor unit, coils in the stator and in the rotor
  • the rotor can correspond to the paddle wheel.
  • the non-contact bearing unit can be designed as a magnetic bearing, preferably as an active magnetic bearing. With active magnetic bearings, the magnetic forces can be adjusted dynamically depending on the paddle wheel position, so that a stable rotation can take place around an equilibrium position.
  • the motor unit is disposed on a side of a first circular disc of the paddle wheel remote from the blades in the housing and the bearing unit is on the other side of the
  • FIG. 1 an embodiment of a paddle wheel according to the invention in FIG. 1
  • Paddle wheel in lateral section with main and side blades which are attached by means of adhesive layer on the first surface;
  • Paddle wheel in lateral section with permanent magnets for driving the paddle wheel
  • Paddle wheel in lateral section comprising a first and second circular disc with blades arranged therebetween;
  • FIG. 1 shows an embodiment of a paddle wheel 1 according to the invention in plan view of the first surface 31 with five main and intermediate blades 41, 42, wherein the intermediate blades are arranged closer to the pressure side of the trailing main blade.
  • the impeller 3 comprises for transporting a liquid F through a centrifugal pump 1 by means of rotation about an axis of rotation R, a first circular disc 3a with a central opening 34 and a thereof extending to a radially outer edge 33 extending first surface 31 (here gray shown), wherein on the first surface 31 five each of the central opening 34 as
  • Main blades 41 with a pressure side 41 d and a suction side 41 s are located.
  • the pressure side 41 d denotes the side of the main blade 41, to which the
  • Liquid which enters through the central opening 34 in the impeller 3, flows on rotation of the impeller 3 in the direction of rotation U and to
  • an intermediate blade 42 extending from a starting point 42a in the direction of the edge 33 to an end point 42e is arranged in each case.
  • the main and intermediate blades 41, 42 have a respective length 41 L, 42 L from their respective starting points 41 a, 42 a to their respective end points 41 e, 42 e, wherein the length of the intermediate blades 42 L is significantly shorter than the length of the main blades 42 L.
  • the end points 42e of the intermediate blades are also located on the outer edge 33 of the first surface 31. Since there are five main blades 41 on the paddle wheel 3, five intermediate blades 42 are correspondingly also present.
  • Blades 42 have a distance DZ to the center 35 of the first surface 31 that is greater than the radius 34R of the central opening 34.
  • the radius RZ of the circle corresponds to the
  • Main vane 41 than the suction side 41 s of the intermediate vane 42 leading main blades 41 are arranged, wherein a first circle segment KS1 (shown in phantom) between the center of the intended axis of rotation R 35 of the first surface 31 and the end points 41 e of adjacent main blades 41 a main blade Opening angle HW and a second circle segment KS2 (shown in dashed lines) between the center 35 and the end point 41 e of the respective main blade 41 and the end point 42 e of the intake side behind the main blade 41 arranged intermediate blade 42 an intermediate blade opening angle ZW are clamped, wherein the intermediate blade Opening angle ZW here is approximately 0.65 of the corresponding main blade opening angle HW.
  • HW main bucket and intermediate vane opening angle
  • the impeller 3 shown here is also between the pressure side 41 d, 42 d of the main and intermediate blades 41, 42 and a respective tangent TR to the edge 33 of the circular first surface 31 at the respective end points 41 e, 42 e of the main and intermediate blades 41, 42 spans a blade exit angle SW, which is between 60 degrees and 70 degrees.
  • the impeller 3 shown here includes five main blades 41 and five intermediate blades 42. In other embodiments, fewer main or intermediate blades 41, 42 may be disposed on the first surface.
  • 2 shows a further embodiment of a paddle wheel 3 according to the invention in lateral section with main and secondary blades 41, 42, which are fastened by means of an adhesive layer 7 on the first surface 31. Reference is made to FIG. 1 for the other components shown here. In alternative embodiments, the connection between blades 4 and first surface 31 may also be made by welding. Alternatively, the paddle wheel 3 can also be made in one piece. 3 shows a further embodiment of an inventive
  • Paddle wheel 3 in lateral section with permanent magnets 36 for driving the paddle wheel.
  • the first circular disc 3a of the blade wheel 3 comprises a second surface 32 opposite the first surface 31, in or on which a plurality of permanent magnets 36 are arranged for non-contact rotation of the blade wheel 3 suitable. These permanent magnets 36 interact with one opposite the second surfaces 32
  • FIG. 4 shows a further embodiment of an inventive
  • Paddle wheel 3 in the lateral section comprising a first and second
  • the second circular disc 3b is arranged on the main and intermediate blades 41, 42 parallel to the first disc 3a.
  • the first and second disks 3a, 3b are plane-parallel disks, which also have the same thickness H1, H2.
  • On such a paddle wheel 3 act fluid-related forces that do not or only slightly depending on the flow rate of the liquid F. This is particularly advantageous if the
  • Paddle wheel 3 is mounted without contact and driven and the flow of the liquid F by the pump varies due to application.
  • FIG. 5 shows an embodiment of a centrifugal pump 1 according to the invention for transporting a liquid F comprising a housing 2 with an inlet opening 21 for the liquid to be transported F and a Outlet opening 22 for ejecting the liquid F, wherein the housing 2 encloses a rotatable in the housing 2 according to the invention paddle wheel 3 with blades 4 and the centrifugal pump 1 is configured so that the paddle wheel 3 can be rotated in the housing 2 about a rotation axis R, so that the liquid F is transported from the inlet opening 21 in the radial direction RR from a central opening 34 in the impeller 3 via the impeller 3 to the outlet opening 22.
  • the centrifugal pump 1 shown here may be a blood pump 1 for pumping blood F as the fluid F to be pumped or a delivery pump 1 for pumping a thixotropic fluid F as the fluid F.
  • the centrifugal pump may include a motor unit 5 for contactless rotation of the impeller 3 and a bearing unit 6 for contactless storage of the impeller 3.
  • the motor unit 5 may be disposed on a side facing away from the blades 4 side of a first circular disc 3a of the impeller 3 in the housing 2 and the bearing unit 6 may be arranged on the other side of the impeller 3 in a plane perpendicular to the axis of rotation R of the impeller 3.
  • FIG. 6 shows by way of example a flow calculation for a centrifugal pump with impeller (a) according to the prior art and (b) according to the present invention in plan view of the respective impellers.
  • the centrifugal pump 1 PA with paddle wheel according to the prior art has five main blades and no intermediate blades, here there are large stagnation areas SG between the main blades.
  • the stagnation areas SG have a low liquid flow with relative velocities RG
  • Centrifugal pump 1 according to the present invention, however, has only small stagnation areas, which do not lead to thickening of the liquid to be transported (in the case of blood so to a reduced thrombosis risk).
  • 7 shows by way of example a flow calculation for a centrifugal pump with paddle wheel 3, where (a) the intermediate blade 42 to the suction side 41 s of
  • Centrifugal pumps each have four main and intermediate blades 41, 42, wherein in 7a, the intermediate blades are not according to the invention moved exactly to the other side of the main blades 41 as in the present invention, as shown in Figure 7b.
  • the centrifugal pump in FIG. 7a has large stagnation areas SG reinforced by the position of the intermediate blades between main and intermediate blades 41, 42, while the centrifugal pump 1 according to the invention has only very small stagnation areas between the main and intermediate blades 41, 42.
  • the stagnation areas SG have a low liquid flow with relative velocities RG (flow velocity) less than 0.5 m / s (dark colored).
  • centrifugal pump blood pump, pump for thixotropic fluids
  • F fluid such as blood

Abstract

L'invention concerne une roue à aubes (3) destinée à transporter un liquide (F) à travers une pompe centrifuge (1) par rotation autour d'un axe de rotation (R) dans la pompe centrifuge (1), laquelle roue à aubes peut être actionnée avec des zones de stagnation réduites. L'invention concerne également une pompe centrifuge (1) équipée d'une telle roue à aubes (3). La roue à aubes (3) comprend au moins un premier disque (3a) circulaire présentant une ouverture centrale (34) et une première surface (31) s'étendant de l'ouverture centrale (34) à un bord (33) extérieur vu en direction radiale, plusieurs aubes principales (41) s'étendant dans chaque cas de l'ouverture centrale (34), comme point de départ (41a), jusqu'au bord (33), comme point final (41e), chaque aube principale présentant un intrados (41d) et un extrados (41s) et dans chaque cas une aube intermédiaire (42) s'étendant entre un point de départ (42a) en direction du bord du disque (33) et un point final (42b) est disposée entre deux aubes principales (41) adjacentes. Chaque point de départ (42a) des aubes intermédiaires (42) présente une distance (DZ) par rapport au centre de la roue à aubes (3) supérieure au diamètre de l'ouverture centrale (34) et chacune des aubes intermédiaires (42) est disposée plus près de l'intrados (41d) de l'aube principale (41) qui suit l'aube intermédiaire (42) pendant la rotation de la roue à aubes (3) que de l'extrados (41s) des aubes principales (41) qui précèdent ladite aube intermédiaire (42).
EP17732920.8A 2016-06-28 2017-06-27 Roue à aubes et pompe centrifuge équipée d'une telle roue à aubes Pending EP3475577A1 (fr)

Applications Claiming Priority (2)

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DE102016211589.8A DE102016211589A1 (de) 2016-06-28 2016-06-28 Flüssigkeitspumpe mit Schaufelrad
PCT/EP2017/065824 WO2018002034A1 (fr) 2016-06-28 2017-06-27 Roue à aubes et pompe centrifuge équipée d'une telle roue à aubes

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CN112156255B (zh) * 2020-10-14 2022-07-26 北京航空航天大学 一种体外循环磁轮一体化的磁悬浮离心血泵
CN116920265A (zh) * 2022-03-14 2023-10-24 心擎医疗（苏州）股份有限公司 离心式磁悬浮血泵

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GB191116529A (en) * 1911-07-18 1912-04-04 Edmund Scott Gustave Rees Improvements in Centrifugal Pumps or Turbines.
GB658843A (en) * 1948-12-14 1951-10-17 Belliss & Morcom Ltd Improvements relating to centrifugal pumps, air or other compressors and the like
US3487784A (en) * 1967-10-26 1970-01-06 Edson Howard Rafferty Pumps capable of use as heart pumps
FI87009C (fi) * 1990-02-21 1992-11-10 Tampella Forest Oy Skovelhjul foer centrifugalpumpar
IT225647Y1 (it) * 1991-05-22 1997-01-13 Zanussi Elettrodomestici Girante per pompa centrifuga
JP3399528B2 (ja) * 1992-07-30 2003-04-21 コーブ カルディオバスキュラー， インコーポレイテッド 渦巻き型血液ポンプ
JP3516530B2 (ja) * 1995-07-28 2004-04-05 日機装株式会社 低比速度インペラ
CN103557178B (zh) * 2008-05-27 2016-07-06 伟尔矿物澳大利亚私人有限公司 泥浆泵叶轮

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WO2018002034A1 (fr) 2018-01-04

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