WO2011117801A2 - Single-entry radial pump - Google Patents

Single-entry radial pump Download PDF

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Publication number
WO2011117801A2
WO2011117801A2 PCT/IB2011/051168 IB2011051168W WO2011117801A2 WO 2011117801 A2 WO2011117801 A2 WO 2011117801A2 IB 2011051168 W IB2011051168 W IB 2011051168W WO 2011117801 A2 WO2011117801 A2 WO 2011117801A2
Authority
WO
WIPO (PCT)
Prior art keywords
cross
blades
passage
impeller
sections
Prior art date
Application number
PCT/IB2011/051168
Other languages
French (fr)
Other versions
WO2011117801A3 (en
Inventor
Andrzej Korczak
Roman Kustosz
Wojciech Bujok
Eugeniusz Altyntsev
Tomasz Synowiec
Original Assignee
Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi
Politechnika Śląska
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 Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi, Politechnika Śląska filed Critical Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi
Publication of WO2011117801A2 publication Critical patent/WO2011117801A2/en
Publication of WO2011117801A3 publication Critical patent/WO2011117801A3/en

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
    • F04D29/2238—Special flow patterns
    • F04D29/2255—Special flow patterns flow-channels with a special cross-section contour, e.g. ejecting, throttling or diffusing effect
    • 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
    • A61M60/808—Vanes or blades specially adapted for deformable impellers, e.g. expandable 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
    • A61M60/20—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
    • 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
    • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
    • A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices

Definitions

  • the object of the invention is a single entry single- or multistage radial pump with one or more closed impellers and a low specific speed.
  • Standard designs of radial pumps have impellers with blades, whose inlet angle ensures a tangent inflow of the liquid at the nominal rate of flow of the pump, and the outlet angle which ensures an adequate reactivity of the impeller.
  • the angular momentum of the liquid through the impeller and monotonic course of the average relative and meridional velocities results from the monotonic change of the camber angle of the blades between the inlet and outlet diameters of the impeller.
  • an adequate angle of the overlapping angle of the blades of the impellers amounts to 35° - 65°. Due to the assumption of a constant thickness of the blades, the width of the impeller, measured axially, decreases along the radius.
  • the impeller designed in such a way has a blade passage with a decreasing hydraulic radius along the central stream line, a defined ratio of the perpendicular cross-section to the central stream line versus the circumference of the cross-section.
  • the single-entry radial pump with a low specific speed is characterized by the following features:
  • the shape of the acti ve surface of the blades or their axis is in the form of a camber line of the blades in an impeller of classical design structure, thus calculated in accordance with Kaplan's method of conformal representation or by means of Pfleiderer's point by point method.
  • the thickness of the blades and the disks of the impeller varies in such a way that the cross-section of the diffuser channels between the blades of the impeller and between the inlet and the outlet keep a perpendicular position versus the central lines of the flow, thus being geometrically similar, i.e. their hydraulic radius increases monotonicaHy.
  • the assumed shape of the cross-sections perpendicular to the flow line of the channel between the impeller blades may be a convex polygon with rounded or unrounded corners, e.g. quadrangle, square, rectangle or trapezoid, or even a circle or an ellipse.
  • the radial pump with a low specific speed displays a better hydraulic efficiency than pumps with the same parameters, but equipped with an impeller of the classical design.
  • the flow lines of impellers according to the new design may be situated on the plane perpendicular to the axis of the impeller or have a spatial curvature.
  • the radial pump of the new design may be applied particularly for pumping liquids with viscosity exceeding the viscosity of water, e. g. blood, in the pumping of which the hydraulic losses increase with the decreasing hydraulic radius of the flow passage.
  • Fig.1 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to its central stream line in the shape of the inlet to the passage of a typical radial impeller.
  • Fig.2 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line in the shape of squares.
  • Fig. 3 shows the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central flow line geometrically shaped similar to rectangles.
  • Fig.4 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line geometrically shaped similar to trapezoids.
  • Fig. 5. presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line in the shape of circles.
  • Fig, 6 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line in the shape of ellipses.
  • the radial pump with a low specific speed presented in Fig 1 has a closed impeller with the frontal disc 1. and the back disc 2 and blades 3 shaped in such a way that the active surface 4 of the blades has the shape of a camber line of the blades in a classically designed impeller, and the monotonically increasing cross- sections 5 of the passage, perpendicular to its central line is - over its entire length - geometrically shaped as the cross-section of the inlet channel.
  • the radial pump with a low specific speed presented in Fig. 2, has a closed impeller with a frontal disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber Jine of the blades in classically designed impellers, and the monotonically increasing cross- sections 5 of the passage beyond their inlet are squares with corners rounded with a radius smaller than half of its side, keeping square cross-sections perpendicular to the central stream line of the passage up to its outlet.
  • the radial pump with a low specific speed presented in Fig. 3, has a closed impeller with a front disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber line of the blades in a classically designed impeller; the monotonically increasing cross-sections 5 of the passage, after passing the inlet assume the shape of a rectangle with corners rounded at a radius which is smaller than half the length of its shorter side, keeping geometrically similar rectangular cross-sections, perpendicular to the central stream line of the passage up to its outlet.
  • Fig. 4 has a closed impeller with a front disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber line of the blades in a classically designed impeller; the monotonically increasing cross-sections 5 of the channels between the blades, after passing the inlet, assume the shape of a trapezoid with corners rounded at a radius smaller than half the length of its shortest side, keeping geometrically similar trapezoidal cross-sections, perpendicular to the central stream line of the channel up to its outlet.
  • Fig. 5 has a closed impeller with a front disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber line of the blades in a classically designed impeller; and the monotonically increasing cross- sections 5 of the passage after passing their inlets, keep circular cross-sections, perpendicular to the central stream line of the passage tip to its outlet.
  • the radial pump with a low specific speed presented in Fig. 6 has an impeller with a frontal disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are shaped similarly to the camber line of the blades in a classically designed impeller and the monotonically increasing cross-sections of the passage 5, after passing their inlet, becomes ellipsoidal in shape, keeping geometrically similar ellipsoidal shapes, perpendicular to the central flow line of the passage up to its outlet.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Cardiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Turbines (AREA)

Abstract

Single-entry radial pump with a closed impeller with active blade surfaces or central stream lines of the flow passage between two consecutive blades similar to the camber line of the blades achieved by Kaplan's method of conformal representation or by means of Pfleiderer's point by point method is characterized by the fact that the impeller has discs (1, 2) and blades (3) shaped in such a way that the cross - sections (5) of its diffuser passages keep the shape of their cross - sections similar to each other, perpendicular to the central stream line of the passage between the blades over its entire length.

Description

Single- entry radial pump
The object of the invention is a single entry single- or multistage radial pump with one or more closed impellers and a low specific speed.
Various designs of impeller pumps with low specific speeds are known: side—channel pumps, peripheral pumps, disk pumps, pumps with impellers with holes ( W. Jedral, Pompy wirowe, PWN, Warsaw 2001 , p. 404 ). All of the above pumps are applied in spite of their low efficiency (not exceeding 50%). It is due to the fact that the efficiency of radial pumps with the same parameters, designed according to the theory of radial torque pumps, where empirical coefficients arc applied, have long and narrow flow passages, which results in their even lower efficiency.
Standard designs of radial pumps have impellers with blades, whose inlet angle ensures a tangent inflow of the liquid at the nominal rate of flow of the pump, and the outlet angle which ensures an adequate reactivity of the impeller. The angular momentum of the liquid through the impeller and monotonic course of the average relative and meridional velocities results from the monotonic change of the camber angle of the blades between the inlet and outlet diameters of the impeller. Moreover, it is assumed that an adequate angle of the overlapping angle of the blades of the impellers amounts to 35° - 65°. Due to the assumption of a constant thickness of the blades, the width of the impeller, measured axially, decreases along the radius. The impeller designed in such a way has a blade passage with a decreasing hydraulic radius along the central stream line, a defined ratio of the perpendicular cross-section to the central stream line versus the circumference of the cross-section.
The single-entry radial pump with a low specific speed, according to the invention is characterized by the following features:
it has an impeller with blade inlets at a tangential angle versus the direction of the mean stream of flow,
- the outlet angle of the active surface of the blades corresponds to its reactivity,
the cross-sections of the flow passage between two consecutive blades of the impeller increase monotonically to such cross sections that the meridional velocity of the flow in them results from calculations of typical designs o f radial pumps,
the shape of the acti ve surface of the blades or their axis is in the form of a camber line of the blades in an impeller of classical design structure, thus calculated in accordance with Kaplan's method of conformal representation or by means of Pfleiderer's point by point method.
the thickness of the blades and the disks of the impeller varies in such a way that the cross-section of the diffuser channels between the blades of the impeller and between the inlet and the outlet keep a perpendicular position versus the central lines of the flow, thus being geometrically similar, i.e. their hydraulic radius increases monotonicaHy. The assumed shape of the cross-sections perpendicular to the flow line of the channel between the impeller blades may be a convex polygon with rounded or unrounded corners, e.g. quadrangle, square, rectangle or trapezoid, or even a circle or an ellipse. Thanks to the monotonically increasing hydraulic radii of the impeller passage, the radial pump with a low specific speed displays a better hydraulic efficiency than pumps with the same parameters, but equipped with an impeller of the classical design. The flow lines of impellers according to the new design may be situated on the plane perpendicular to the axis of the impeller or have a spatial curvature. The radial pump of the new design may be applied particularly for pumping liquids with viscosity exceeding the viscosity of water, e. g. blood, in the pumping of which the hydraulic losses increase with the decreasing hydraulic radius of the flow passage.
The impeller of the invented single-entry radial pump has been illustrated in the attached drawings. Fig.1 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to its central stream line in the shape of the inlet to the passage of a typical radial impeller. Fig.2 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line in the shape of squares. Fig. 3 shows the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central flow line geometrically shaped similar to rectangles. Fig.4 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line geometrically shaped similar to trapezoids. Fig. 5. presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line in the shape of circles. Fig, 6 presents the axonometric cross-section of an impeller with a diffusive passage, whose cross-sections are perpendicular to the central stream line in the shape of ellipses.
The radial pump with a low specific speed presented in Fig 1 has a closed impeller with the frontal disc 1. and the back disc 2 and blades 3 shaped in such a way that the active surface 4 of the blades has the shape of a camber line of the blades in a classically designed impeller, and the monotonically increasing cross- sections 5 of the passage, perpendicular to its central line is - over its entire length - geometrically shaped as the cross-section of the inlet channel.
The radial pump with a low specific speed, presented in Fig. 2, has a closed impeller with a frontal disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber Jine of the blades in classically designed impellers, and the monotonically increasing cross- sections 5 of the passage beyond their inlet are squares with corners rounded with a radius smaller than half of its side, keeping square cross-sections perpendicular to the central stream line of the passage up to its outlet.
The radial pump with a low specific speed, presented in Fig. 3, has a closed impeller with a front disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber line of the blades in a classically designed impeller; the monotonically increasing cross-sections 5 of the passage, after passing the inlet assume the shape of a rectangle with corners rounded at a radius which is smaller than half the length of its shorter side, keeping geometrically similar rectangular cross-sections, perpendicular to the central stream line of the passage up to its outlet.
The radial pump with a low specific speed, presented in
Fig. 4 has a closed impeller with a front disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber line of the blades in a classically designed impeller; the monotonically increasing cross-sections 5 of the channels between the blades, after passing the inlet, assume the shape of a trapezoid with corners rounded at a radius smaller than half the length of its shortest side, keeping geometrically similar trapezoidal cross-sections, perpendicular to the central stream line of the channel up to its outlet.
The radial pump with a low specific speed, presented in
Fig. 5 has a closed impeller with a front disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are similar to the camber line of the blades in a classically designed impeller; and the monotonically increasing cross- sections 5 of the passage after passing their inlets, keep circular cross-sections, perpendicular to the central stream line of the passage tip to its outlet.
The radial pump with a low specific speed, presented in Fig. 6 has an impeller with a frontal disc 1 and a back disc 2 and blades 3 shaped in such a way that the active surfaces 4 of the blades are shaped similarly to the camber line of the blades in a classically designed impeller and the monotonically increasing cross-sections of the passage 5, after passing their inlet, becomes ellipsoidal in shape, keeping geometrically similar ellipsoidal shapes, perpendicular to the central flow line of the passage up to its outlet.

Claims

Patent claims
1 . Single-entry radial pump with a low speci fic speed with a closed impeller having active surfaces of the blades or central stream lines of the flow passage between two consecutive blades as the camber line of blades achieved by conforming representation or by means of the point method, characterized in that the impeller has discs 1 , 2 and blades 3 shaped in such a way that the cross-sections 5 of its diffuser passages keep the shape of their cross-sections similar to each other, perpendicular to the central stream line of the passage between the blades over its entire length.
2. The pump according to claim 1 characterized in that the cross- section 5 of the diffuser passage between two consecutive impeller blades, after passing their inlet shaped like a square with corners rounded up with a radius smaller than half the length of its side, keep quadratic cross-sections perpendicular to the central stream line of the passage up to its outlet.
3. The pump according to claim 1 characterized in that the cross- section 5 of the diffuser passage, after passing their inlet shaped like a rectangle with corners rounded up with a radius smaller than half the length of its shorter side, keep similar rectangular cross-sections perpendicular to the central stream line of the passage up to its outlet.
4. The pump according to claim 1 characterized in that the cross- section 5 of the diffuser impeller passages, after passing their inlet shaped like a trapezoid with corners rounded up with a radius smaller than half the length of its shortest side, and which has two acute angles at the longer basis, keep geometrically similar trapezoidal cross-sections, perpendicular to the central stream line of the passage up to its outlet.
5. The pump according to claim 1 characterized in that the cross-section 5 of the diffuser impeller passages, after passing their inlet shaped like a circle, keep their circular cross- sections perpendicular to the central stream line of the passage up to its outlet.
6. The pump according to claim 1 characterized in that the cross-section 5 of the diffuser impeller passages, alter passing their inlet shaped like an ellipse, keep similar elliptical cross- sections perpendicular to the central stream line of the passage up to its outlet.
PCT/IB2011/051168 2010-03-22 2011-03-21 Single-entry radial pump WO2011117801A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL390781A PL216284B1 (en) 2010-03-22 2010-03-22 Single-jet centrifugal pump
PLPL390781A 2010-03-22

Publications (2)

Publication Number Publication Date
WO2011117801A2 true WO2011117801A2 (en) 2011-09-29
WO2011117801A3 WO2011117801A3 (en) 2011-12-29

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WO (1) WO2011117801A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20130019A1 (en) * 2013-05-17 2014-11-18 Nuovo Pignone Srl IMPELLER WITH CIRCULAR RETROGYATED PIPES.
EP3173108A1 (en) * 2015-11-30 2017-05-31 Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi Impeller with closed channels for a centrifugal implantable ventricular assist pump
EP2930367B1 (en) 2013-07-05 2020-05-27 Ebara Corporation Pump blade for submerged pump and submerged pump having same
RU2735971C1 (en) * 2020-02-25 2020-11-11 Игорь Олегович Стасюк Impeller of blade pump stage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2074650A (en) * 1934-01-24 1937-03-23 William S Holdaway Centrifugal pump
DE3332875A1 (en) * 1983-09-12 1985-03-28 Siemens AG, 1000 Berlin und 8000 München Radial impeller for flow machines
DE3843428C2 (en) * 1988-12-23 1993-12-09 Klein Schanzlin & Becker Ag Centrifugal pump impeller with low specific speed
US5540550A (en) * 1994-01-21 1996-07-30 Nikkiso Co., Ltd. Solid impeller for centrifugal pumps
US6254340B1 (en) * 1997-04-23 2001-07-03 Metaullics Systems Co., L.P. Molten metal impeller

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
W. JEDRAL, POMPY WIROWE, PWN, 2001, pages 404

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20130019A1 (en) * 2013-05-17 2014-11-18 Nuovo Pignone Srl IMPELLER WITH CIRCULAR RETROGYATED PIPES.
WO2014184368A1 (en) * 2013-05-17 2014-11-20 Nuovo Pignone Srl Impeller with backswept circular pipes
EP2930367B1 (en) 2013-07-05 2020-05-27 Ebara Corporation Pump blade for submerged pump and submerged pump having same
EP3173108A1 (en) * 2015-11-30 2017-05-31 Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi Impeller with closed channels for a centrifugal implantable ventricular assist pump
RU2735971C1 (en) * 2020-02-25 2020-11-11 Игорь Олегович Стасюк Impeller of blade pump stage

Also Published As

Publication number Publication date
PL390781A1 (en) 2011-09-26
WO2011117801A3 (en) 2011-12-29
PL216284B1 (en) 2014-03-31

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