EP1240434B1 - Schaufel einer kreiselmachine und leistungsregelungsverfahren des schaufels - Google Patents

Schaufel einer kreiselmachine und leistungsregelungsverfahren des schaufels Download PDF

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Publication number
EP1240434B1
EP1240434B1 EP00987557A EP00987557A EP1240434B1 EP 1240434 B1 EP1240434 B1 EP 1240434B1 EP 00987557 A EP00987557 A EP 00987557A EP 00987557 A EP00987557 A EP 00987557A EP 1240434 B1 EP1240434 B1 EP 1240434B1
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EP
European Patent Office
Prior art keywords
edge
trailing edge
blade
rear face
along
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.)
Expired - Lifetime
Application number
EP00987557A
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English (en)
French (fr)
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EP1240434A1 (de
Inventor
Philippe Gyomlai
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.)
Jeumont SA
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Jeumont SA
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Filing date
Publication date
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Publication of EP1240434A1 publication Critical patent/EP1240434A1/de
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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
    • F04D29/24—Vanes
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • 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
    • 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
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

Definitions

  • the invention relates to a blade of a centrifugal machine for pumping or compressing a fluid and in particular a blade of a helico-centrifugal type pump.
  • a fuel pump In nuclear power plants comprising a reactor cooled by pressurized water, it is used to circulate the pressurized water constituting the primary cooling fluid of the nuclear reactor core, in a circuit called a primary circuit, a fuel pump.
  • helico-centrifugal type with a single pumping stage.
  • Such a helico-centrifugal pump comprises a pump wheel on which are fixed curved blades in a propeller arrangement.
  • the pump wheel is rotated by an electric motor, via a drive shaft, the vanes being integral with the pump wheel along a first edge and each having a front face and a rear face directed, respectively, forwards and backwards, considering the direction of movement of the rotating pump wheel during operation of the pump.
  • the front face and the rear face of the blades of the pump are constituted by curved surfaces which may be respectively designated by the terms extrados and intrados, the front face constituting an outer face and the rear face an inner face of the blade.
  • the fluid which is pumped or compressed in a centrifugal machine circulates in contact with the front and rear faces of the blades, from the inside to the outside, that is to say between the first edge of the connected blade the wheel and the second edge or edge of the blade connecting the front face and the rear face according to the thickness of the blade, in its outer part.
  • This second edge of the blade according to which fluid flows are detached from the front and rear faces of the blade is called the trailing edge.
  • the trailing edges of the vanes of the pump wheel are arranged along a cylindrical or conical surface having the axis of the pump wheel as axis.
  • Some centrifugal pumps have a wheel vane load that can be high.
  • the bladed load of the wheel is at a high level.
  • the end profile of the blades made by sharpening or trimming does not always make it possible to obtain performances that are constant during the use of the pump. Indeed, the performances which depend on the separation of the fluid boundary layers in contact with the faces of the blade are dependent on the variations of the physicochemical characteristics of the fluid conveyed and the surface condition of the blade faces which condition the zones. detachment of the circulating fluid layers on contact.
  • FR-A-1,025,250 proposes a blade of a centrifugal pump whose fluid flow channel provides at least a sudden enlargement due to the production of at least one recess which constitutes a line of separation. fluid passing through the channel.
  • the object of the invention is therefore to provide a blade of a centrifugal machine for pumping or compressing a fluid integral with a wheel mounted to rotate, having a front face and a rear face respectively directed forwardly and backward with respect to the direction of movement of the rotating wheel and limited, at one of their ends located downstream in the direction of flow of the fluid, along the faces of the blade, by an edge of the blade called trailing edge constituting a separation zone, the fluid flow and the faces of the blade, this blade having perfectly adjusted performance which can be adjusted in a simple manner to ensure stable operation and constant of the pump over time.
  • the blade according to the invention comprises, in a part of its outer surface comprising the trailing edge and two zones respectively of the front face and the rear face adjacent to the trailing edge, at least five edges in a longitudinal direction of the trailing edge extending substantially the entire length of the trailing edge, at least one edge constituting an additional line of detachment of fluid extending along at least one of the trailing edge and the rear face or face down.
  • the invention also relates to centrifugal machine blades made according to one of the independent claims 5 and 6.
  • the invention also relates to a method for adjusting the fluidic characteristics of a blade of a centrifugal machine, according to claim 8.
  • FIGS. 1A and 1B are cross-sectional views of an end portion adjacent to the trailing edge of a blade of a helico-centrifugal pump, illustrating two methods according to the prior art for modifying the performance of dawn .
  • Figure 2 is a view similar to the views of Figures 1A and 1B illustrating a third method for modifying the performance of a blade according to the prior art.
  • Figure 3 is a partial elevational view of a helico-centrifugal pump wheel and a blade of the pump made according to the invention.
  • Figure 4 is a sectional view along 4-4 of the end portion of the blade near the trailing edge.
  • Figure 5 is a sectional view similar to the view of Figure 4 of a blade of a pump according to the invention and according to an alternative embodiment.
  • Figure 6 is a partial elevational view of a wheel and a blade of a pump according to the invention and according to a second embodiment.
  • Figure 7 is a sectional view along 7-7 of an end portion of the blade in the vicinity of the trailing edge.
  • Figures 8 and 9 are sectional views similar to the view of Figure 4, two embodiments of the end portion of the blade.
  • FIGS. 3 and 6 A pump wheel of a helico-centrifugal pump such as a primary pump of a nuclear power plant cooled by pressurized water has been shown diagrammatically in FIGS. 3 and 6 which relate to a pump impeller. having blades according to the invention.
  • the pump wheel generally designated by the reference numeral 1, comprises a body 2 of substantially frustoconical shape secured at one of its ends to a hub 3 via a first flange 2 '.
  • Blades 4 are fixed on the body 2 of the pump wheel, by an edge 4a, along a helical line having axis 6 of the axis of the pump wheel.
  • the pump wheel comprises several blades identical to the blade 4 (for example six blades) distributed along the periphery of the body 2 of the pump wheel about the axis 6.
  • the blades 4 of the pump wheel 1 are all connected along an edge opposite the fixing edge on the body 2, to a flange 5 called belt flange.
  • the flanges 2 'and 5 have a common axis axis 6 of the pump wheel.
  • Each of the blades 4 of the pump comprises a front face 8, or extrados, and a rear face 7, or intrados, the front and rear of the blade being defined taking into account the direction of rotation of the wheel of pump around the axis 6.
  • the fluid which is pumped for example the water under pressure of the primary circuit of a nuclear reactor, circulates between the successive vanes 4 of the pump wheel and in contact with the faces of the vanes 4, in a centrifugal manner, that is, away from the axis 6 of the pump wheel.
  • the edge 4b, farthest from the axis 6, constitutes the trailing edge, in the vicinity of which the boundary layers of the flows in contact with the front and rear faces of the blade 4 come off and leave the contact with dawn 4.
  • FIGS. 1A and 1B there is shown in a sectional view a plane such that the sectional plane 4-4 shown in FIG. 3 perpendicular to the trailing edge, an end part adjacent to the trailing edge of FIG. a pump blade 4 'according to the prior art.
  • the portion of the blade 4 'disposed outwardly constitutes the trailing edge 4'b separating the downstream end portions of the back face or intrados face 7' and the front face, or extrados face 8 ', of dawn 4 '.
  • the intrados face 7 ' is separated from the trailing edge 4'b by a lower surface edge 9', the extrados face 8 'being separated from the trailing edge 4'b by an extrados edge 10'.
  • the trailing edges of the blades 4b are generally located on a cylinder of diameter D having axis axis 6 of the pump wheel.
  • the hydraulic performance of the blade 4 ' depends in particular on the diameter D or outlet diameter of the blade 4'.
  • the diameter D is variable along the trailing edge.
  • the performance of the blade 4 ' also depends on the fineness of the dawn in the vicinity of the trailing edge, the performance being all the better as the blade 4' is thinner in its neighboring part of the trailing edge.
  • the sharpening can be carried out in such a way that the edges of the intrados and extrados are practically merged along an edge common to both faces, at the end of sharpening.
  • the increase in the performance of the blade 4 ' can also be obtained by cutting the end portion 14 of the blade 4', along a cutting line 14 'making an angle close to 90 ° with the tangent to the extrados 8 'at the extrados edge 10'.
  • the performance of the blade 4 ' is increased by increasing the outlet section of the blade.
  • Cutting the blade increases the performance of the blade, in a defined manner without possibility of adjustment.
  • the principle of the invention consists in imposing an additional detachment line of the fluid, at the exit end of the wheel vane, or on the edge of the vane constituting the trailing edge, close to the ridge extrados for the flow coming from the extrados, either on the intrados face of the blade near the intrados ridge, or on both the edge of the blade and on the intrados face.
  • machining is created in the end zone of the blade, in the direction of the trailing edge and substantially along the entire length of the trailing edge, a sharp discontinuity of the profile of the blade, of such that the gradient of velocity and therefore of local pressure triggers the detachment of the boundary layer at a precise location defined by the position of the discontinuity.
  • a sharp discontinuity of the profile of the blade of such that the gradient of velocity and therefore of local pressure triggers the detachment of the boundary layer at a precise location defined by the position of the discontinuity.
  • FIGS 3 and 4 there is shown a first embodiment of a blade 4 according to the invention on which additional edges have been made by the mode A mentioned above.
  • the additional edges are obtained by making a discontinuity in the trailing edge, by machining a groove 15 having a triangular section, as is visible in Figure 4.
  • Figure 3 shows that the groove 15, constituting the discontinuity of the edge 4b, extends over the entire length of the trailing edge 4b.
  • the section of the groove 15, in a plane perpendicular to the trailing edge, of triangular shape, has a side disposed along the trailing edge and two sides falling inside the end portion of the blade between the surface of intrados 7 and the surface of extrados 8.
  • the side of the triangular section of the groove 15 located on the extrados side constitutes a section of a substantially planar facet making, with the section of the trailing edge 4b, an angle ⁇ greater than 30 °.
  • the angle ⁇ will be between 30 and 90 °.
  • the groove 15 occupies only part of the width of the trailing edge 4b, so that a flange 16 of width 11 extending over the entire length of the trailing edge is formed on the side of the extrados and that a flange 17 along the entire length of the trailing edge 4b is formed on the side of the intrados 7.
  • the discontinuity of the trailing edge 4b defines three additional ridges 18a, 18b, and 18c, in addition to the intrados-edge 9 and the extrados-edge 10.
  • the facet the extrados passing through the edges 18a and 18b makes an angle at least equal to 30 ° with the trailing edge, as indicated above.
  • the flange 16 disposed on the side of the upper surface 8 has a width I1 which is between 5 and 50% of the width of the edge of the blade 4 constituting the trailing edge 4b.
  • the minimum width of this edge 16 is 0.5 mm, so as to maintain the reference output diameter D of the blade.
  • the flange 17 located on the side of the intrados 7 has a width I2 as small as possible, this width must however be larger than 0.5 mm, so as to maintain the reference of the outlet diameter D of the blade 4.
  • FIG 5 there is shown an alternative embodiment of the blade 4; a discontinuity 19 is made on the intrados face 7 of the blade 4, so as to obtain additional ridges of the boundary layer of circulating fluid in contact with the intrados face, these edges being of the type B mentioned above. .
  • the discontinuity 19 is in the form of a triangular section groove extending in the direction of the trailing edge 4b, substantially the entire length of the trailing edge.
  • the groove with triangular section 19 defines three additional ridges located on the intrados face 7.
  • the groove 19 is defined in particular by the distance p between the intrados edge 7 and the edge 19a located furthest from the intrados edge 9.
  • the ridges 19b and 19c are located respectively inside the end portion of the blade 4 and on the underside surface and in a disposition closer to the intrados edge 9 than the edge 19a.
  • the surface of the groove 19 passing through the edges 19a and 19b constitutes a substantially flat facet intersecting the intrados face 7 along the edge 19a at a distance p from the intrados edge 9 which must be greater than the distance separating the intrados edge of the natural separation point of the boundary layer of fluid flowing in contact with the intrados, this distance being able to be determined by tests or by calculation according to the operating conditions of the pump.
  • the distance p will be between a few millimeters and a few tens of millimeters depending on the pump wheel and the original performance of the blade of the pump, that is to say, the blade 4 does not not including groove 19.
  • the section of the plane facet passing through the edges 19a and 19b by the cutting plane makes an angle ⁇ with the section of the intrados face of the blade.
  • FIGS. 6 and 7 show a second embodiment of a blade 4 according to the invention of a pump wheel 1 similar to the wheel Figure 7 is a section of the blade 4 in a plane perpendicular to the trailing edge 4b.
  • the blade 4 according to the invention is cut along a trace cutting plane 20 in FIG. 7, the trace 20 of the cutting plane making an angle ⁇ less than or equal to 90 ° with the plane tangential to the extrados 8, at the extrados edge 10.
  • a preferred value for the angle ⁇ is ⁇ equal to 80 °.
  • the section of the end portion of the fin 4 on the intrados side 7 forms an edge 21 on the intrados face 7 and an additional edge 22 on the trailing edge 4b at a distance 1 from the edge 10 is formed in this manner a rim 23 of width 1 along the trailing edge 4b, the side of the extrados 8.
  • the width 1 of the edge 23 must be between 5 and 50% of the width of origin of the portion 4b constituting the trailing edge delimited between the intrados face 7 and the extrados face 8 on a cylinder having for axis the axis of the pump wheel and a diameter D.
  • the rim 23 must have a minimum width of 0.5 mm, so that the reference of the exit diameter of the blade is retained.
  • the additional ridges 21 and 22 created by the cut along the cutting plane 20 cause the controlled separation of the boundary layer of fluid moving in contact with the surfaces of the intrados and extrados.
  • the exit diameter of the blade is increased.
  • FIGS. 6 and 7 in which complementary edges are made on the underside face and on the trailing edge corresponds to an embodiment of type C described above, that is to say combining embodiments of types A and B.
  • FIG. 8 and in FIG. 9 two variants of embodiment of the blade according to the invention are shown also carried out according to the type C, that is to say combining the types A and B.
  • FIG. 8 a section is shown in a plane perpendicular to the trailing edge of the end portion of a blade 4 of a pump comprising a discontinuity consisting of two substantially planar facets 24 and 25 perpendicular to one another.
  • the facet 24 is made by cutting the end portion of the blade along a substantially planar surface, perpendicular to the underside face 7.
  • the facet 25 is made by cutting along a substantially flat surface parallel to the face of the blade. 7.
  • the cutting surfaces defining the facets 24 and 25 extend in the longitudinal direction of the trailing edge 4b, substantially the entire length of the trailing edge.
  • the facet 24 and the corresponding cutting surface are placed at a distance p from the intrados edge 9, that is to say from the intersection between the intrados face 7 and the cylinder having the axis axis of the pump wheel and the outlet diameter D.
  • the facet 25 and the corresponding cutting surface are arranged so as to intersect the trailing edge 4b along an additional edge 26a disposed at a distance 1 from the extrados edge. 10. Between the extrados edge and the additional edge 26a the trailing edge 4b is in the form of a rim of width 1.
  • the pump blade 4 has a second additional edge 26b on the underside face, at a distance p from the original pressure seam edge.
  • a third edge 26c is defined by the intersection of the facets 24 and 25 in the inner part of the pump blade 4, between the intrados and extrados surfaces 8.
  • FIG. 9 shows a last embodiment of the blade 4 of a pump according to the invention, this embodiment combining triangular section grooves similar to the grooves of the embodiments shown in FIGS. 5.
  • the groove 15 is formed on the trailing edge 4b and the groove 19 on the intrados face 7.
  • the trace facet 18a, 18b of the groove 18 is defined by the angle ⁇ of its trace in the cutting plane perpendicular to the trailing edge 46 with the trace of the trailing edge 4b.
  • the trace facet 19a, 19b of the groove 19 is defined by the angle ⁇ of its trace in the plane of section with the trace of the intrados face 7.
  • the parameters I1, I2 and p are defined as indicated previously.
  • the blade produced according to the invention makes it possible to obtain a controlled detachment of the fluid boundary layers circulating in contact with the intrados and extrados faces of the blade during the operation of the centrifugal machine.
  • delamination conditions of the boundary layers are defined in particular as a function of lengths such as I1, 12, I and p as well as angles ⁇ and ⁇ .
  • the blades according to the invention can be made directly in the factory with end portions as described and adapted to the intended operation of the pump.
  • the end portions of the blades may also be modified after commissioning of the pump, for example by grinding or cutting, to be adapted to new conditions of use.
  • At least one additional edge is formed on the outlet end portion of the blade, for example by machining, extending substantially along the entire length of the trailing edge, in addition to the edge of the blade. extrados and the intrados ridge.
  • machining or cutting can be envisaged for making discontinuities of the end part of the blade including the trailing edge and the adjacent parts of the face of the face and of the face of the face, to obtain at least three edges of fluid separation in the end portion of the blade.
  • the invention applies not only to helical centrifugal pumps such as the primary pumps of nuclear reactors, but also in the case of many other centrifugal hydraulic machines.

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Claims (8)

  1. Schaufel einer Kreiselmaschine zum Pumpen oder zur Kompression einer Flüssigkeit, wobei die Schaufel fest mit einem Rad (1) verbunden ist, das um eine Achse (6) drehbar montiert ist, und die eine Vorderseite (8) und eine Rückseite (7) aufweist, die nach vorne bzw. nach hinten im Verhältnis zur Bewegungsrichtung des rotierenden Rads (1) gerichtet sind und die durch einen Rand (4b) der Schaufel, genannt Abflussrand, begrenzt sind, der sich an einem ihrer äußeren Enden zum Abfluss hin in Fließrichtung der Flüssigkeit entlang der Vorder- und Rückseiten (7, 8) der Schaufel befindet, dadurch gekennzeichnet, dass die Schaufel, in einem Teil ihrer äußeren Oberfläche, die den Abflussrand (4b) aufweist, und in einem Teil der Bereiche der Vorderseite (8) und der Rückseite (7), die an den Abflussrand (4b) stoßen, mindestens fünf Kanten (9, 10, 18a, 18b, 18c, 19a, 19b, 19c, 21, 22, 26a, 26b, 26c) aufweist, die sich in einer Längsrichtung des Abflussrands (4b) im wesentlichen entlang der vollständigen Länge des Abflussrands (4b) erstrecken, wobei zumindest eine Kante eine zusätzliche Ablösungslinie für die Flüssigkeit darstellt, die sich entlang dem Abflussrand und/oder der Rückseite (7) erstreckt.
  2. Schaufel gemäß Anspruch 1, dadurch gekennzeichnet, dass sie entlang ihrem Abflussrand (4b) eine Nut (15) aufweist, die einen dreieckigen Schnitt, in einer zum Abflussrand (4b) rechtwinkligen Ebene aufweist, und die auf der Seite der Vorderseite (8) eine erste Seite aufweist, die mit dem Abflussrand (4b) einen Winkel α von mindestens 30° bildet, wobei die erste Seite (18a, 18b) den Abflussrand (4b) entlang einer Kante (18a) schneidet, die mit der Kante (10) der Vorderseite, die durch die Schnittlinie der Vorderseite (8) und des Abflussrands (4b) gebildet wird, einen Rand einer Breite (11) entlang der Längsrichtung des Abflussrands begrenzt, und wobei die Nut (15) eine zweite Seite aufweist, die den Abflussrand erneut entlang einer zweiten zusätzlichen Kante (18c) schneidet, die mit einer Kante (9) der Rückseite, die durch die Schnittlinie der Rückseite (7) und des Abflussrands (4b) gebildet wird, einen Rand (17) einer Breite (12) begrenzt.
  3. Schaufel gemäss Anspruch 2, dadurch gekennzeichnet, dass der Winkel α zwischen 30° und 90° liegt und dass die Längen (11) und (12) zwischen 5 und 50% der Breite des Abflussrands (4b) betragen, das heißt des Abschnitts der Schaufel in ihrem äußersten Teil, das den Abflussrand (4b) aufweist, wobei diese Längen (11) und (12) mindestens gleich 0,5 mm sind.
  4. Schaufel gemäss Anspruch 1, dadurch gekennzeichnet, dass sie eine Nut (19) aufweist, die auf der Rückseite (7) der Schaufel in Längsrichtung des Abflussrands (4b) maschinell ausgearbeitet ist, wobei diese Nut einen dreieckigen Schnitt in einer zum Abflussrand (4b) rechtwinkligen Ebene aufweist, so dass eine zusätzliche Kante (19a) in einem Abstand (p) von einer Kante (9) der Rückseite, die sich an der Schnittlinie der Rückseite (7) und des Abflussrands (4b) befindet, entsteht, wobei der Abstand (p) größer ist als der Abstand zwischen einem Bereich der natürlichen Ablösung einer Grenzschicht der Flüssigkeit, die in Kontakt mit der Rückseite (7) fließt, und der Kante (9) der Rückseite, wobei dieser Abstand ausgehend von den Arbeitsbedingungen der Kreiselmaschine bestimmt wird.
  5. Schaufel einer Kreiselmaschine zum Pumpen oder zur Kompression einer Flüssigkeit, wobei die Schaufel fest mit einem Rad (1) verbunden ist, das um eine Achse (6) drehbar montiert ist, und die eine Vorderseite (8) und eine Rückseite (7) aufweist, die nach vorne bzw. nach hinten im Verhältnis zur Bewegungsrichtung des rotierenden Rads (1) gerichtet sind und die durch einen Rand (4b) der Schaufel, genannt Abflussrand, begrenzt sind, der sich an einem ihrer äußeren Enden zum Abfluss hin in Fließrichtung der Flüssigkeit entlang der Vorder- und Rückseiten (7, 8) der Schaufel befindet, die zumindest eine Kante aufweist, die eine zusätzliche Ablösungslinie der Flüssigkeit darstellt, wobei der Abflussrand (4b) von der Vorderseite (8) durch eine Kante (10) der Vorderseite getrennt ist, dadurch gekennzeichnet, dass die Schaufel (4) entlang einer Schnittebene (20) geschnitten ist, die einen Winkel (α) kleiner oder gleich 90° mit der Ebene bildet, die die Vorderseite (8) auf der Höhe der Kante (10) der Vorderseite berührt, wobei die Ebene (20) mit der Rückseite (7) eine zusätzliche Kante (21) in einem Bereich dieser Rückseite (7) bildet, der an den Abflussrand (4b) stößt, und mit dem Abflussrand (4b) eine weitere zusätzliche Kante (22) bildet, wobei diese zusätzliche Kante (22) mit der Kante (10) der Vorderseite einen Rand (23) einer Breite (1) begrenzt, die zwischen 5% und 50% der Breite des Abflussrands (4b) und mindestens 0,5 mm beträgt, wobei die beiden zusätzlichen Kanten (21, 22) sich entlang einer Längsrichtung des Abflussrands (4b) im wesentlichen über die gesamte Länge dieses Abflussrands (4b) erstrecken.
  6. Schaufel einer Kreiselmaschine zum Pumpen oder zur Kompression einer Flüssigkeit, wobei die Schaufel fest mit einem Rad (1) verbunden ist, das um eine Achse (6) drehbar montiert ist, und die eine Vorderseite (8) und eine Rückseite (7) aufweist, die nach vorne bzw. nach hinten im Verhältnis zur Bewegungsrichtung des rotierenden Rads (1) gerichtet sind und die durch einen Rand (4b) der Schaufel, genannt Abflussrand, begrenzt sind, der sich an einem ihrer äußeren Enden zum Abfluss hin in Fließrichtung der Flüssigkeit entlang der Vorder- und Rückseiten (7, 8) der Schaufel befindet, wobei sie zumindest eine Kante aufweist, der eine zusätzliche Ablösungslinie der Flüssigkeit darstellt, wobei der Abflussrand (4b) von der Vorderseite (8) durch eine Kante (10) der Vorderseite getrennt ist, dadurch gekennzeichnet, dass die Schaufel (4) eine Unterbrechung aufweist, die durch zwei im wesentlichen ebene Seiten (24, 25) begrenzt wird, die entlang Schnittflächen, die rechtwinklig zur Rückseite (7) bzw. parallel zur Rückseite (7) sind, abgeschnitten sind, wobei die zur Rückseite (7) rechtwinklige Seite (24) diese Rückseite entlang einer zusätzlichen Kante (26b) erneut schneidet, wobei sich diese zusätzliche Kante (26b) in einem Abstand (p) von der ursprünglichen Kante (9) der Rückseite befindet, die sich an der Schnittlinie der Rückseite (7) und des Abflussrands (4b) befindet, und die zur Rückseite (7) parallele Seite (25) den Abflussrand (4b) entlang einer weiteren zusätzlichen Kante (26a) erneut schneidet, wobei sie mit der Kante (10) der Vorderseite einen Rand einer Breite (1) begrenzt, wobei diese Breite (1) zwischen 5% und 50% der Breite des Abflussrands (4b) und mindestens 0,5 mm beträgt, und der Abstand (p) größer ist als der Abstand, der die Kante (9) der Rückseite vom Ablösungspunkt der Grenzschicht der Flüssigkeit, die in Kontakt mit der Rückseite (7) fließt, trennt und zwischen einigen Millimetern und einigen Zehntelmillimetern beträgt.
  7. Schaufel gemäß Anspruch 1, dadurch gekennzeichnet, dass der Abflussrand (4b) von der Vorderseite (8) und der Rückseite (7) durch die Kante (10) der Vorderseite bzw. die Kante (9) der Rückseite getrennt ist, und dass sie zugleich Folgendes aufweist:
    eine Nut (15) entlang ihrem Abflussrand (4b), die einen dreieckigen Schnitt, in einer zum Abflussrand (4b) rechtwinkligen Ebene aufweist, und die auf der Seite der Vorderseite (8) eine erste Seite aufweist, die mit dem Abflussrand (4b) einen Winkel α von mindestens 30° bildet, wobei die erste Seite (18a, 18b) den Abflussrand (4b) entlang einer ersten zusätzlichen Kante (18a) schneidet, die mit der Kante (10) der Vorderseite einen Rand einer Breite (11) entlang der Längsrichtung des Abflussrands (4b) begrenzt, und die eine zweite Seite (18b, 18c) aufweist, die den Abflussrand (4b) entlang einer zweiten zusätzlichen Kante (18c), erneut schneidet, die mit der Kante (9) der Rückseite einen Rand (17) einer Breite (12) begrenzt, und
    eine Nut (19), die auf der Rückseite (7) der Schaufel in Längsrichtung des Abflussrands (4b) maschinell ausgearbeitet ist, wobei diese Nut einen dreieckigen Schnitt, in einer zum Abflussrand (4b) rechtwinkligen Ebene aufweist, der auf der entgegengesetzten Seite der Kante (9) der Rückseite durch eine Seite (19a, 19b) begrenzt wird, die mit der Rückseite (7) eine dritte zusätzliche Kante (19a) bildet, die sich in einem Abstand (p) von der Kante (9) der Rückseite befindet, wobei dieser Abstand (p) größer ist als der Abstand zwischen einem Bereich der natürlichen Ablösung einer Grenzschicht der Flüssigkeit, die in Kontakt mit der Rückseite (7) fließt, und der Kante (9) der Rückseite, wobei dieser Abstand ausgehend von den Arbeitsbedingungen der Kreiselmaschine bestimmt wird.
  8. Verfahren zur Einstellung der Leistungen einer Kreiselmaschine zum Pumpen oder zur Kompression einer Flüssigkeit, wobei die Schaufel fest mit einem Rad (1) verbunden ist, das drehbar montiert ist, und die eine Vorderseite (8) und eine Rückseite (7) aufweist, die nach vorne bzw. nach hinten im Verhältnis zur Bewegungsrichtung des rotierenden Rads (1) gerichtet sind und die durch einen Rand (4b) der Schaufel, genannt Abflussrand, begrenzt sind, der sich an einem ihrer äußeren Enden zum Abfluss hin in Fließrichtung der Flüssigkeit entlang der Vorder- und Rückseiten der Schaufel (4) befindet, dadurch gekennzeichnet, dass durch die Bearbeitung eines Bereichs der äußeren Oberfläche der Schaufel (4), die den Abflussrand (4b) aufweist, und von Bereichen der Vorderseite (8) und der Rückseite (7), die an den Abflussrand (4b) stoßen, zusätzlich zu einer Kante (9) der Rückseite und einer Kante (10) der Vorderseite, die sich an der Schnittlinie des Abflussrands und der Vorderseite bzw. der Rückseite befmden, mindestens drei zusätzliche Kanten (18a, 18b, 18c, 21, 22, 26a, 26b, 26c, 19a, 19b, 19c) gebildet werden, die sich in einer Längsrichtung des Abflussrands (4b), im wesentlichen über die gesamte Länge des Abflussrands (4b), erstrecken.
EP00987557A 1999-12-21 2000-12-13 Schaufel einer kreiselmachine und leistungsregelungsverfahren des schaufels Expired - Lifetime EP1240434B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9916173 1999-12-21
FR9916173A FR2802579B1 (fr) 1999-12-21 1999-12-21 Aube d'une machine centrifuge et procede de reglage des performances de l'aube
PCT/FR2000/003511 WO2001046593A1 (fr) 1999-12-21 2000-12-13 Aube d'une machine centrifuge et procede de reglage des performances de l'aube

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EP1240434A1 EP1240434A1 (de) 2002-09-18
EP1240434B1 true EP1240434B1 (de) 2006-03-08

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EP (1) EP1240434B1 (de)
KR (1) KR100654305B1 (de)
AT (1) ATE319935T1 (de)
DE (1) DE60026606T2 (de)
FR (1) FR2802579B1 (de)
WO (1) WO2001046593A1 (de)

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* Cited by examiner, † Cited by third party
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JP2020133534A (ja) * 2019-02-21 2020-08-31 愛三工業株式会社 遠心ポンプ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1688345A (en) * 1927-08-16 1928-10-23 Buffalo Hammer Mill Corp Centrifugal fan
DE897801C (de) * 1949-09-04 1953-11-23 Pleuger Kommanditgesellschaft Laufrad fuer Kreiselpumpen
FR1025250A (fr) * 1949-09-28 1953-04-13 Procédé pour débiter des liquides au moyen de pompes centrifuges, et pompe centrifuge pour la mise en oeuvre de ce procédé
US3027845A (en) * 1959-11-16 1962-04-03 Worthington Corp Impeller tip pocket
NL6703083A (de) * 1966-03-17 1967-09-18
DE19614420C2 (de) * 1996-04-12 2003-05-22 Aloys Wobben Rotorblatt und Windenergieanlage mit einem Rotorblatt

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KR20020070463A (ko) 2002-09-09
FR2802579A1 (fr) 2001-06-22
DE60026606T2 (de) 2006-12-14
FR2802579B1 (fr) 2002-06-14
ATE319935T1 (de) 2006-03-15
EP1240434A1 (de) 2002-09-18
KR100654305B1 (ko) 2006-12-07
DE60026606D1 (de) 2006-05-04
WO2001046593A1 (fr) 2001-06-28

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