EP1520992B1 - Diffuseur pour une pompe rotatoire - Google Patents

Diffuseur pour une pompe rotatoire Download PDF

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Publication number
EP1520992B1
EP1520992B1 EP04020975A EP04020975A EP1520992B1 EP 1520992 B1 EP1520992 B1 EP 1520992B1 EP 04020975 A EP04020975 A EP 04020975A EP 04020975 A EP04020975 A EP 04020975A EP 1520992 B1 EP1520992 B1 EP 1520992B1
Authority
EP
European Patent Office
Prior art keywords
blade
centrifugal pump
pump according
edge
guide
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.)
Not-in-force
Application number
EP04020975A
Other languages
German (de)
English (en)
Other versions
EP1520992A2 (fr
EP1520992A3 (fr
Inventor
Peer Springer
Thomas Pensler
Christoph Jaeger
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.)
KSB AG
Original Assignee
KSB AG
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 KSB AG filed Critical KSB AG
Publication of EP1520992A2 publication Critical patent/EP1520992A2/fr
Publication of EP1520992A3 publication Critical patent/EP1520992A3/fr
Application granted granted Critical
Publication of EP1520992B1 publication Critical patent/EP1520992B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers

Definitions

  • the invention relates to a centrifugal pump of axial or semi-axial design, with a located on the pressure side of an impeller stator whose substantially radially extending vanes are arranged with a blade outer edge on a flow-carrying wall, wherein the inlet edges of the vanes are arranged to be fleeing in the flow direction to the impeller axis of rotation and a free hub loose passage is formed between the blade inner edges of the vanes.
  • a centrifugal pump which is mainly used for the promotion of wastewater, as with the help of such a Leitrades the risk of clogging is avoided by fibers located in the wastewater.
  • a stator in the form of a casting allows accurate blade training, but it is very expensive and expensive.
  • the attempt is made to design such a stator as a welded construction then the problem arises of producing the stator blades. Such produced as individual blades sheet metal parts must have reproducible shapes and comply with the specified geometric view of hydraulic shapes.
  • a generic centrifugal pump with a stator is known from DE 1 653 713 A1.
  • a similar stator is known from EP 0 310 121 A2.
  • the invention is therefore based on the problem of finding a simple production possibility for a generic stator.
  • the guide vanes are designed as sheet-metal shaped parts, wherein the guide blade blanks are formed as a development of a conical surface and the shaped guide vanes are cut-outs of this conical surface.
  • the guide vanes are designed as a development of a plurality of tangentially adjacent conical surface areas.
  • forming a single vane as part of one or more conical surfaces results in the settlement of a simple to produce sheet metal blank.
  • the curvature or curvature of the flow-guiding vane surfaces to be attached thereto produces, for example, a simple forming process via correspondingly formed rolling tools or other known forming tools.
  • As a result of the formation of the vanes as a settlement of one or more conical surfaces results for each finished vane a well-defined position within the stator housing in which they are to be attached, for example by a welded joint.
  • a blade side edge arranged on a smaller radius of the cone forms the free blade inner edge of the guide blade closest to the rotor axis of rotation and a blade edge fixed towards a larger radius of the cone forms a blade outer edge attached to the stator housing, wherein the blade outer edge is formed from a Cutting curve of the conical surface with the flow-carrying wall.
  • the vanes are provided with a direction of flow and in the direction of the impeller axis of rotation arranged scoop leading edge.
  • an embodiment provides that the course thereof is determined from the sectional curve of the blade leading edge of a stator blade with a cone-shaped or funnel-shaped element arranged concentrically around the rotor axis and this element has an opening angle of up to 130 °. This creates a per se known blade leading edge at which an adhesion of fibers in the flow is reliably avoided. Impinging fibers slide off due to flow forces in the direction of the free center line of the casing or the impeller axis of rotation.
  • a guide blade inlet angle 2 remains the same towards decreasing stator radius or becomes smaller. Since the guide vanes are formed as part of one or more conical surface, there is the additional advantage of over the entire height of the vane approximately constant Leitschaufel-entry angle 2 which results in a much better Leitradanströmung with the result of improved energy conversion within the stator. At a Leitradaus Stammswinkel of 90 ° corresponds to the trailing edge of the vane of a generatrix of the lateral surface of the cone.
  • a corner located at the intersection between the blade leading edge and the channel-side or free blade inner edge is rounded off by a transition to provide favorable transitions between the adjoining blade edges.
  • a guide vane to be mounted of smaller surface area is taken from a deformed vane blank having a larger surface area. If required by the particular forming tools used, a larger vane blank containing excess material is bent and a vane to be assembled is cut out of the converted vane blank by known means. Likewise, a vane can be reshaped as a finished in the outer dimensions vane.
  • the flow-guiding wall of the stator housing is designed as a conical or tubular shaped sheet metal part and that an impeller of axial or semi-axial design is arranged in front of or inside the stator.
  • the vanes are connected to their respective mating surface, the blade outer edge, by suitable methods with the flow-guiding wall.
  • Fig. 1 shows a spatial representation during the design phase of a stator.
  • a cylinder 1 which corresponds to a limiting flow-guiding wall 1.1 of a stator 2, is concentrically cut by an imaginary, cone-shaped or funnel-shaped element 3.
  • the element 3 projects with its tip 4 into the cylinder 1.
  • the here - for reasons of clarity - not shown axes of element 3 and cylinder 1 coincide.
  • the imaginary conical or funnel-shaped element 3 has an opening angle which can assume an order of magnitude of up to 130 °.
  • the element 3 has a lateral surface 5, which forms the basis for a blade end edge 6 of a blade 7 which is arranged in a fleeing manner.
  • An arrow 8 symbolizes the flow direction through the stator 2.
  • Another imaginary cone element 9 is shown standing freely in the room next to the cylinder 1, wherein the lateral surface of the cone 9 intersects the cylinder 1.
  • the axes of cones 9 and cylinder 1, not shown here are at a distance and at an angle to each other.
  • the flow-guiding surface of the guide vane 7 arranged inside the cylinder 1 is part of the lateral surface of the cone 9 which cuts the cylinder 1.
  • the cone 9 is located in the flow direction of the arrow 8 to the right of the stator 2.
  • the stator 2 has in this embodiment, fasteners 10 and 10.1, with which it is attached to a later installation and in which a - here not shown - impeller is arranged with a drive.
  • the section line of the cone 9 with the cylinder 1 forms the blade outer edge with which a guide blade in the stator 2 is attached to the wall 1.1.
  • This blade outer edge is located on a larger radius of the conical surface of the cone 9, as the free standing in the blade inside edge 12, which is arranged on a smaller radius of the cone 9.
  • the cutting edge of the conical surface of the cone 9 with the lateral surface of the conical or funnel-shaped element 3 forms the blade inlet edge 6 of a guide blade. 7
  • a stator outlet angle of 90 ° is provided on a guide blade 7, for which reason the blade outlet edge 11 of a guide blade 7 is at the same time the generatrix of the conical surface of the cone 9.
  • Other vane exit angles are possible without any problems.
  • the 2 shows a guide blade 7 as a development from the conical surface of the cone 9. This development is transmitted to a flat sheet metal part.
  • the lines a - b drawn thereon correspond to the lines of intersection of the conical surface of the cone 9 with the cylinder 1 and the conical or funnel-shaped element 3 from the representation of FIG. In this case, the line a corresponds to that blade outer edge 13 with which a guide blade 7 in the stator 2 is attached to its flow-guiding wall 1.1.
  • a line b forms at the intersection of the cone 9 with the element 3, the blade inlet edge 6 of a guide vane 7 from.
  • the line c corresponds to a circular arc on a plane and vertical section to the axis of the cone 9. Their position is determined by a required in the design of the stator free ball passage through the hubless stator determined.
  • the line c corresponds to the blade inner edge 12 of a guide vane 7.
  • the lines a-e of a guide vane that determine the circumference of a guide vane 7 can be cut out of a sheet-metal blank before or after a forming process.
  • a forming process is carried out by means of tapered rollers or other forming techniques.
  • Such a vane is welded in a cylindrical stator. This results in a well-defined position between the blade outer edge 13 and the flow-guiding wall 1.1 at a suitable blunt attachment and thus a simple fast attachment, for example by welding technology, is possible.
  • a corresponding diffuser-shaped truncated cone or similar component would find application.
  • the cutting lines of such a diffuser-shaped cylinder replacement with the element 3 and the cone 9 would then determine the inner, outer and blade leading edge of the vanes.
  • the generator of such a vane is any line in the room, which fulfills the condition that it lies on the conical surface to be formed. This line is particularly clearly visible in the region of the trailing edge when the exit angle of the guide vane is 90 ° or as the trailing edge when the exit angle is exactly 90 °.
  • the line d or the blade outlet edge 11 is always perpendicular to the blade inner edge 12.
  • the blade leading edge 6 results as a free cut curve, which is no longer apparent as the generatrix of the conical surface of the first cone 3, although, since it is necessarily on the conical surface, it will generate the same conical surface when rotating about the cone axis.
  • the element 3 is designed as a cone. If a different course of the blade leading edge 6 is desired, then the element 3 can also have a funnel-shaped course, which does not represent a cone in the mathematical sense.
  • a guide vane shape which is formed as part of one or more conical surface areas, there is the essential advantage of a guide blade inlet angle 2 which remains constant over the height of a guide vane 7.
  • a desired course of a stator inlet angle 2 can be adjusted as a function of the radial distance to a wheel rotational axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)

Claims (12)

  1. Pompe centrifuge de type axial ou semi-axial, avec une roue directrice (2) installée du côté de pression d'une roue mobile, dont les aubes directrices sensiblement radiales (7, 7.x) sont disposées avec une arête extérieure d'aube (13) sur une paroi de guidage d'écoulement (1.1), dans laquelle les arêtes d'entrée (6) des aubes directrices (7) sont disposées de façon fuyante vers l'axe de rotation de la roue mobile dans la direction de l'écoulement (8) et un passage libre sans moyeu est formé entre les arêtes intérieures d'aube (12) des aubes directrices (7), dans laquelle les aubes directrices (7) sont des pièces profilées en tôle, caractérisée en ce que les ébauches des aubes directrices sont formées par la développante d'une surface latérale conique et les aubes directrices profilées (7, 7.x) sont des parties de cette surface latérale conique.
  2. Pompe centrifuge selon la revendication 1,
    caractérisée en ce que les aubes directrices (7, 7.x) sont formées par la développante de plusieurs surfaces latérales coniques jointives tangentiellement les unes aux autres.
  3. Pompe centrifuge selon la revendication 1 ou 2, caractérisée en ce qu'une arête latérale d'aube disposée sur un plus petit rayon du cône (9) forme l'arête intérieure d'aube (12) libre des aubes directrices (7, 7.x) située le plus près de l'axe de rotation de la roue mobile.
  4. Pompe centrifuge selon la revendication 1, 2 ou 3, caractérisée en ce qu'une arête latérale d'aube disposée en direction d'un plus grand rayon du cône (9) forme une arête extérieure d'aube (13) fixée au boîtier de la roue directrice (2), dans laquelle l'arête extérieure d'aube (13) est formée par une courbe d'intersection de la surface latérale conique avec la paroi de guidage d'écoulement (1.1).
  5. Pompe centrifuge selon les revendications 1, 2, 3 ou 4, caractérisée en ce qu'une arête d'entrée d'aube (6) est formée par la courbe d'intersection d'une aube de roue directrice (7, 7.x) avec un élément (3) en forme de cône ou d'entonnoir disposé concentriquement autour de l'axe de rotation de la roue mobile et cet élément (3) présente un angle d'ouverture pouvant valoir 130°.
  6. Pompe centrifuge selon la revendication 5, caractérisée en ce qu'un angle d'entrée +a reste égal ou diminue vers le rayon décroissant de la roue directrice.
  7. Pompe centrifuge selon les revendications 1 à 6, caractérisée en ce que, avec un angle de sortie de roue directrice de 90°, une arête de sortie d'aube (11) des aubes directrices (7, 7.x) correspond à une génératrice de la surface latérale du cône (9).
  8. Pompe centrifuge selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'une transition arrondie (3) est disposée entre l'arête d'entrée d'aube (6) et l'arête intérieure d'aube libre (12).
  9. Pompe centrifuge selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le contour d'une aube directrice (7, 7.x) à monter de plus petite surface est prélevé dans une ébauche d'aube directrice déformée de plus grande surface.
  10. Pompe centrifuge selon l'une quelconque des revendications 1 à 9, caractérisée en ce que la paroi de guidage d'écoulement (1.1) du boîtier de roue directrice (2) est formée par une pièce de tôle réalisée en forme de cône ou de tube.
  11. Pompe centrifuge selon l'une quelconque des revendications 1 à 10, caractérisée en ce qu'une roue mobile de type axial ou semi-axial est disposée avant ou à l'intérieur du boîtier de roue directrice (2).
  12. Pompe centrifuge selon l'une quelconque des revendications 1 à 11, caractérisée en ce que l'arête de sortie d'aube (11) est perpendiculaire à l'arête intérieure d'aube (12).
EP04020975A 2003-10-04 2004-09-03 Diffuseur pour une pompe rotatoire Not-in-force EP1520992B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10346058 2003-10-04
DE10346058A DE10346058A1 (de) 2003-10-04 2003-10-04 Kreiselpumpen-Leitrad

Publications (3)

Publication Number Publication Date
EP1520992A2 EP1520992A2 (fr) 2005-04-06
EP1520992A3 EP1520992A3 (fr) 2005-07-27
EP1520992B1 true EP1520992B1 (fr) 2006-06-21

Family

ID=34306248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04020975A Not-in-force EP1520992B1 (fr) 2003-10-04 2004-09-03 Diffuseur pour une pompe rotatoire

Country Status (3)

Country Link
EP (1) EP1520992B1 (fr)
AT (1) ATE331143T1 (fr)
DE (2) DE10346058A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105756956A (zh) * 2016-04-05 2016-07-13 镇江江大泵业科技有限公司 一种新型切割式潜水排污泵

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH237680A (de) * 1942-07-21 1945-05-15 Voith Gmbh J M Aus Blech gebogene Leitschaufel für Axialgebläse.
SE384070B (sv) * 1974-07-23 1976-04-12 Stenberg Flygt Ab Propellerpump
EP0310121B1 (fr) * 1987-09-30 1992-06-17 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Procédé de fabrication de dispositifs de refoulement et/ou de direction pour machines à écoulement et impulseur radial réalisé selon ce procédé, en particulier impulseur de fluide de refroidissement pour moteurs à combustion
DE4330098A1 (de) * 1993-09-06 1995-03-09 Klein Schanzlin & Becker Ag Als Blechformteil ausgebildete Leiteinrichtung

Also Published As

Publication number Publication date
DE502004000817D1 (de) 2006-08-03
DE10346058A1 (de) 2005-04-21
EP1520992A2 (fr) 2005-04-06
ATE331143T1 (de) 2006-07-15
EP1520992A3 (fr) 2005-07-27

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