EP4396456A1 - Auget d'une turbine pelton et son procédé de production - Google Patents

Auget d'une turbine pelton et son procédé de production

Info

Publication number
EP4396456A1
EP4396456A1 EP22730477.1A EP22730477A EP4396456A1 EP 4396456 A1 EP4396456 A1 EP 4396456A1 EP 22730477 A EP22730477 A EP 22730477A EP 4396456 A1 EP4396456 A1 EP 4396456A1
Authority
EP
European Patent Office
Prior art keywords
substrate
coating
tip
cutting edge
erosion
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
EP22730477.1A
Other languages
German (de)
English (en)
Inventor
Reiner Mack
Axel Kratzsch
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.)
Voith Patent GmbH
Original Assignee
Voith Patent 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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4396456A1 publication Critical patent/EP4396456A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B1/00—Engines of impulse type, i.e. turbines with jets of high-velocity liquid impinging on blades or like rotors, e.g. Pelton wheels; Parts or details peculiar thereto
    • F03B1/02—Buckets; Bucket-carrying rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/121—Blades, their form or construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/90—Coating; Surface treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6011—Coating

Definitions

  • the present invention relates to a Pelton turbine with an increased service life and a method for manufacturing the turbine. More particularly, the present invention relates to turbine buckets having a coated substrate and a method of providing and coating the substrate.
  • EP 3 647 585 B1 discloses a hydroelectric turbine component comprising a wedge-shaped substrate having a tip portion and at least two side portions, an erosion-resistant coating being applied to the wedge-shaped substrate, and the erosion-resistant coating being applied to the tip portion is at least 2 times stronger than the erosion resistant coating applied to the side portions and wherein the erosion resistant coating comprises at least 99.5% density.
  • the erosion-resistant coating is applied using the high-velocity air fuel process (HVAF).
  • HVAF high-velocity air fuel process
  • EP 3 647 585 B1 discloses buckets of a Pelton turbine impeller constructed in this way.
  • the object of the invention is to provide an impeller of a Pelton type turbine, which has an alternative structure and is manufactured by an alternative method, the resistance of the impeller to erosion being as high as the resistance of the prior art known wheels.
  • FIG. 4 main cutting edge of a cup according to the invention
  • FIG. 5 main cutting edge of a cup according to the invention
  • FIG. 1 shows a section through a bowl of a turbine of the Pelton type in a schematic representation according to the prior art.
  • the cup comprises a substrate, denoted 1 .
  • the substrate is made of steel.
  • the main cutting edge which is denoted by 2
  • the water jet directed onto the turbine is divided by the main cutting edge into two partial jets, which are deflected by the two cup halves.
  • the main cutting edge is therefore also often referred to as a "splitter”.
  • the section shown in FIG. 1 runs perpendicular to the direction of the main cutting edge.
  • the cup is coated on the inside with an erosion-resistant coating, which is denoted by 3 .
  • the substrate already has essentially the same contour as the coated cup.
  • FIG. 2 shows the main cutting edge 2 from FIG. 1, which has been degraded by erosion. Since the abrasion at the tip of the cutting edge, which is hit by the undivided water jet, is strongest, the coating is first removed there and, after it has been removed, the underlying substrate. The coating that remains on the flanks is removed less quickly than the substrate, so that a characteristic groove is formed. It is clear that such a profile of the main cutting edge leads to significant losses in efficiency, so that an impeller that has been degraded in this way has to be replaced. The degradation process described can be slowed down by providing as much resistant material as possible at the point of greatest abrasion.
  • the inventors have therefore looked for a way of being able to arrange as much resistant material as possible at the most heavily stressed point without the tip radius increasing correspondingly. They have recognized that this can be achieved by the substrate having a contour before coating which corresponds to the contour of a degraded cup (see FIG. 2).
  • FIG. 3 shows the main cutting edge of a cup according to the invention.
  • the substrate has a wedge-shaped form, with the end of the wedge not ending in a single point, but at this point there being a depression or channel arranged between two points.
  • the wedge-shaped substrate comprises a first and a second tip section and a total of four side sections, with a depression extending between the tip sections, and with two side sections being assigned to each tip section, and with two of the side sections on the outside of the wedge-shaped Substrate are arranged, and the other two side portions are oriented inside towards the recess. It is clear that the lines formed by the end points of the two tip sections run parallel to the cutting line of the main cutting edge. The indentation forms a sort of “valley” between the tip sections.
  • the depression is first filled with erosion-resistant material. After that, the coating process in continue in this area until the coating material has formed a superelevation there in order to form the tip of the main cutting edge.
  • the surface of the coating in the area of the deepest point of the indentation must protrude at least slightly beyond the surface of the coating on the two tip sections.
  • the superelevation is as strong as possible.
  • the outer side sections and the rest of the Pelton cup are coated. Equally, the outer side portions and the remainder of the Pelton cup could be coated first, ie prior to coating the well as previously described. It can be seen from FIG.
  • the tip radius of a main cutting edge produced in this way is comparatively small in relation to the amount of erosion-resistant material at this point.
  • the connection between the coating and the substrate is very strong in this highly stressed area, since the indentation enables a positive fit.
  • FIG. 4 shows the main cutting edge according to the invention, certain characteristic dimensions being indicated. These dimensions relate to the layer thickness of the coating at specific points on the substrate, with the thickness of the coating being measured in each case in the direction perpendicular to the substrate surface at the relevant point.
  • DA indicates the thickness of the coating in the area of an outer side section.
  • Di indicates the thickness of the coating in the area of an inner side section.
  • Ds indicates the thickness of the coating at a tip portion.
  • a main cutting edge according to the invention is characterized in that the following relation is satisfied for the stated thicknesses of the coating:
  • Typical layer thicknesses in the area of the outer side sections are in a range of 0.3 mm ⁇ DA 0.7 mm.
  • FIG. 5 shows the main cutting edge according to the invention, certain further characteristic dimensions being indicated.
  • W is the distance between the two tip portions of the substrate, this distance being perpendicular to the axis of symmetry of the cutting edge and is measured perpendicularly to the cutting edge line.
  • H is the height of the peak sections relative to the deepest point of the indentation. H is plotted parallel to the axis of symmetry of the cutting edge.
  • D is the thickness of the coating at the point at which the axis of symmetry of the main cutting edge intersects the substrate, ie in the middle of the depression, which usually has its deepest point there.
  • the exact shape of the indentation is not critical. The easiest way is to mill such a recess into the substrate, e.g. with a groove milling cutter. After the substrate is provided with the recess, the erosion resistant coating is applied.
  • the suitable materials and compositions of the erosion-resistant coating reference is made to sections [0027] and [0028] of EP 3 647 585 B1.
  • the combination of tungsten carbide particles with a matrix of CoCr is considered particularly suitable.
  • the coating can be carried out by means of HVOF or HVAF. HVOF is considered to be particularly suitable. Details on these processes can be found in EP 3 647 585 B1.
  • the manufacturing process according to the invention comprises the following steps:
  • S1 providing a substrate 1 having a recess which is located between two tip portions and two side portions are located outside of the tip portions;
  • S2 application of an erosion-resistant coating 3 to the substrate 1 in the area of the depression, the same being filled with erosion-resistant material and then the coating process in this area being continued until the coating material has formed an elevation there;
  • S3 Application of an erosion-resistant coating 3 to the substrate im
  • step S1 must be performed before steps S2 and S3. Steps S2 and S3 can then be in any order.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un auget d'une turbine Pelton comprenant un substrat (1), une aube principale (2) et un revêtement résistant à l'érosion (3) recouvrant le substrat (1) ; le substrat (1) présente une forme cunéiforme dans la zone de l'aube principale (2) ; le substrat (1) comprend, dans la région de l'aube principale (2), une première et une seconde partie de pointe et un total de quatre parties latérales ; un évidement s'étend entre les parties de pointe ; chaque partie d'extrémité est associée à deux parties latérales ; deux des parties latérales sont situées sur l'extérieur du substrat en forme de coin et les deux autres parties latérales sont orientées vers l'intérieur vers l'évidement ; et le revêtement (3) forme une partie élevée dans la région de l'évidement afin de former la pointe de l'aube principale (2).
EP22730477.1A 2021-09-02 2022-05-25 Auget d'une turbine pelton et son procédé de production Pending EP4396456A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021122700 2021-09-02
PCT/EP2022/064163 WO2023030704A1 (fr) 2021-09-02 2022-05-25 Auget d'une turbine pelton et son procédé de production

Publications (1)

Publication Number Publication Date
EP4396456A1 true EP4396456A1 (fr) 2024-07-10

Family

ID=82058267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22730477.1A Pending EP4396456A1 (fr) 2021-09-02 2022-05-25 Auget d'une turbine pelton et son procédé de production

Country Status (5)

Country Link
EP (1) EP4396456A1 (fr)
CN (1) CN117916460A (fr)
CO (1) CO2024001990A2 (fr)
PE (1) PE20240870A1 (fr)
WO (1) WO2023030704A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001153019A (ja) * 1999-11-30 2001-06-05 Toshiba Corp ペルトン水車のバケット、ニードル弁及びペルトン水車
EP2072176A1 (fr) * 2007-12-21 2009-06-24 Sulzer Markets and Technology AG Procédé destiné à la fabrication d'une couche de protection à base d'acier contre l'érosion utilisant le laser; Composant comprenant une telle couche de protection à base d'acier contre l'érosion
FR2941639B1 (fr) * 2009-01-30 2012-04-20 Alstom Hydro France Composant neuf de machine hydraulique, procede de fabrication ou de maintenance d'un tel composant
EP3647585B1 (fr) 2018-11-02 2021-04-28 GE Renewable Technologies Composant de turbine hydro-électrique ayant une durée de vie accrue et son procédé de fabrication

Also Published As

Publication number Publication date
CN117916460A (zh) 2024-04-19
WO2023030704A1 (fr) 2023-03-09
CO2024001990A2 (es) 2024-03-07
PE20240870A1 (es) 2024-04-24

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