WO2017082737A1 - Centrifugal pump, methods for its manufacture and repair - Google Patents

Centrifugal pump, methods for its manufacture and repair Download PDF

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Publication number
WO2017082737A1
WO2017082737A1 PCT/NO2016/050223 NO2016050223W WO2017082737A1 WO 2017082737 A1 WO2017082737 A1 WO 2017082737A1 NO 2016050223 W NO2016050223 W NO 2016050223W WO 2017082737 A1 WO2017082737 A1 WO 2017082737A1
Authority
WO
WIPO (PCT)
Prior art keywords
centrifugal pump
piece
pieces
scroll
rotor
Prior art date
Application number
PCT/NO2016/050223
Other languages
French (fr)
Inventor
Guillermo Andrés SARVOLD
Armando Francicso LEGUIZAMÓN
Daniel Horacio MANZON
Original Assignee
Sarvold Guillermo Andrés
Leguizamón Armando Francicso
Manzon Daniel Horacio
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 Sarvold Guillermo Andrés, Leguizamón Armando Francicso, Manzon Daniel Horacio filed Critical Sarvold Guillermo Andrés
Publication of WO2017082737A1 publication Critical patent/WO2017082737A1/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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal
    • 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
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding

Definitions

  • the present invention refers to centrifugal pumps, their manufacture and repair, in all existing types and uses of pumps.
  • fluids and solids in fluids For example Petroleum (fuel oil), sea water, wastewater, solids , etc . ) .
  • Centrifugal pumps either those of great flow as well as those of medium or small flow, are made of casting.
  • the manufactured shape of the centrifugal pump makes that not the whole pump wears out in an even way. There are areas or parts that suffer more wear than others. This implies that the pump in general becomes non operative when its most weak component has worn out, yet having components less demanded still a useful life. If we focus on the aspect of wear by use, the weakest components are the rotor periphery and the scroll of the case. It is proved that the wear of components of a centrifugal pump reduces the performance of same due to the leaks of liquid between the greatest gaps.
  • the periphery of its central section is curved.
  • the area of maximum speed of the fluid shall be a relatively small area when compared with the whole width of the central section.
  • a centrifugal pump which main components, rotor and scroll, are principally made of iron pieces. Each piece may be easily replaced. Each piece may provide a side, the one on the inner side is the scroll, a surface with greater resistance to abrasion or wear. Furthermore, a centrifugal pump is provided where the periphery of its central section is relatively flat. As well, a method to manufacture the centrifugal pump is provided, which consists of preparing a disassembly of the components of the centrifugal pump, rotor and scroll. These disassemblies will take place depending on where they are located in the pump already finished. The edges of the disassemblies may provide bevels for the welding. Once the pieces are being located in position, the joints are filled with the sufficient material of the required supply.
  • a method to repair the centrifugal pump which consists of detecting the worn piece or pieces, removing them from their position by oxyacetylene torch, weld cutting or abrasive disk. To replace them by equivalent pieces which are welded in the appropriate positions .
  • An object of the invention is to provide the components of the centrifugal pump, mainly case and rotor, made of replaceable parts, with which both its manufacture as well as its repair would be facilitated.
  • Another object of the present invention is to provide a centrifugal pump which scroll may be protected with hard ceramics or metal plates of greater strength than the body of the scroll.
  • Another object of the present invention is to provide a method to manufacture both a scroll of a centrifugal pump as well as a rotor as from the welding of replaceable pieces .
  • Another object of the present invention is to provide a method to easily repair the worn pieces of the pump, filling them with welding, and using any existing method: hand welding, semiautomatic welding or with multiple cycles of electrodes, even of different material of supply.
  • the scroll and the rotor of the centrifugal pump (1) of the present invention are made from pieces (2) which are welded among themselves.
  • the material of origin is iron, laminated and of any type of alloy, in respect with the characteristics of the usage. Once welded, they may be subject to thermal hardening treatments.
  • the scroll has two sides (3) with the shape of a washer, being coplanar and separated by a distance of the width of the rotor.
  • the closure of said width is provided with replaceable pieces and is completed with the discharge pipe (5) .
  • Sides may be flat or evidence an inclination opening towards their centre, which presents a central hole (6) .
  • a closing ring (7) completes the central hole.
  • the central hole is sufficiently big to allow the entrance or removal of the pump rotor.
  • Each side has the necessary elements to strongly fix the rotor control as well as the suction hood: peripheric reinforcement, holes for lock bolts, etc.
  • Sides may be made of a single piece or of portions of pieces (8) welded together to obtain the same shape.
  • the periphery (9) of the scroll is made from metal pieces welded together. They may be flat (10) or evidence a curvature (11) equal to that of the sides. In general, pieces are rectangular, one of said sides is welded to the laterals and the other sides are welded to another similar piece at a certain angle so as to accompany the outer circumference of the laterals.
  • the metal is iron .
  • the pieces may have edges (12) prepared to facilitate the weldings .
  • the pieces may also be made of two layers of a metal of different structural property, for example a stronger iron, of great resistance to wear, on the inner side and a commercially iron, as support of the stronger iron layer.
  • the joint between the two layers may be made by welding, riveted or by adhesive epoxy-like.
  • Another embodiment provides a single metal piece, wherein one of its surfaces has been subjected to a process of cementation or nitriding, obtaining a side with high strength iron and the opposite side with the common and less expensive iron as support of the high strong layer.
  • the present invention also comprises a method to manufacture and repair centrifugal pumps.
  • the method to manufacture the centrifugal pump consists of preparing a disassembly of the components of the centrifugal pump, rotor and scroll. These disassemblies will take place depending on where they are located in the pump already finished.
  • the disassemblies of the laterals of the scroll may be triangular sectors with a main radius equal to that of the case, and a minor radius equal to that of the central hole.
  • the edges of the disassemblies may provide bevels for the welding.
  • the disassemblies of the periphery of the scroll are square or rectangular pieces, wherein one of the sides has the width of the periphery of the scroll. As in the case of other pieces, the edges may provide bevels to facilitate the welding.
  • the pieces of the periphery of the scroll may evidence a curvature to accompany the curvature of said periphery. Once the pieces are being located in position, the joints are filled with the sufficient material of the required supply.
  • the method to repair the centrifugal pump consists in detecting the worn piece or pieces, removing them from their position by oxyacetylene torch, weld cutting or abrasive disk. To replace them by equivalent pieces which are welded in the appropriate positions.

Abstract

A centrifugal pump is provided, which main components, rotor and scroll, are principally made of iron pieces. Each piece may be easily replaced. Each piece may provide a side, the one on the inner side is the scroll, a surface with greater resistance to abrasion or wear. Furthermore, a centrifugal pump is provided where the periphery of its central section is relatively flat. The method to manufacture the centrifugal pump, which consists of preparing a disassembly of the components of the centrifugal pump, rotor and scroll. These disassemblies will take place depending on where they are located in the pump already finished. The edges of the disassemblies may provide bevels for the welding. Once the pieces are being located in position, the joints are filled with the sufficient material of the required supply. The method to repair the centrifugal pump which consists in detecting the worn piece or pieces, removing them from their position by oxyacetylene torch, weld cutting or abrasive disk. To replace them by equivalent pieces which are welded in the appropriate positions.

Description

CENTRIFUGAL PUMP , ME THODS FOR I TS MANUFACTURE AND REPAIR
FIELD OF APPLICATION
The present invention refers to centrifugal pumps, their manufacture and repair, in all existing types and uses of pumps. For the transfer of fluids and solids in fluids. (For example Petroleum (fuel oil), sea water, wastewater, solids , etc . ) .
BACKGROUND
Centrifugal pumps, either those of great flow as well as those of medium or small flow, are made of casting.
This feature presents a series of inconveniences inherent to castings. When a component, or a part of same breaks or deteriorates, all the set must be replaced. Repairs may be made but there are not wholly reliable. The welding of cast pieces, specially those of great size, is a task that requires specialized welders. It is a difficult process since in scrolls of great size, the casting may get cracked or broken when applying intense heat to localized areas.
The manufactured shape of the centrifugal pump makes that not the whole pump wears out in an even way. There are areas or parts that suffer more wear than others. This implies that the pump in general becomes non operative when its most weak component has worn out, yet having components less demanded still a useful life. If we focus on the aspect of wear by use, the weakest components are the rotor periphery and the scroll of the case. It is proved that the wear of components of a centrifugal pump reduces the performance of same due to the leaks of liquid between the greatest gaps.
At present, it may be estimated, for centrifugal pumps to extract sand that operate 24 hours a day, that the conventional rotor made of casting lasts approximately four months and a half, and that the case lasts approximately 18 months. (The example is provided only as a comparison) .
When the case is made of casting, the periphery of its central section is curved. The area of maximum speed of the fluid shall be a relatively small area when compared with the whole width of the central section.
SUMMARY OF THE INVENTION
A centrifugal pump is provided, which main components, rotor and scroll, are principally made of iron pieces. Each piece may be easily replaced. Each piece may provide a side, the one on the inner side is the scroll, a surface with greater resistance to abrasion or wear. Furthermore, a centrifugal pump is provided where the periphery of its central section is relatively flat. As well, a method to manufacture the centrifugal pump is provided, which consists of preparing a disassembly of the components of the centrifugal pump, rotor and scroll. These disassemblies will take place depending on where they are located in the pump already finished. The edges of the disassemblies may provide bevels for the welding. Once the pieces are being located in position, the joints are filled with the sufficient material of the required supply.
As well, a method to repair the centrifugal pump is provided, which consists of detecting the worn piece or pieces, removing them from their position by oxyacetylene torch, weld cutting or abrasive disk. To replace them by equivalent pieces which are welded in the appropriate positions .
OBJECTIVES OF THE INVENTION
An object of the invention is to provide the components of the centrifugal pump, mainly case and rotor, made of replaceable parts, with which both its manufacture as well as its repair would be facilitated.
Another object of the present invention is to provide a centrifugal pump which scroll may be protected with hard ceramics or metal plates of greater strength than the body of the scroll.
Another object of the present invention is to provide a method to manufacture both a scroll of a centrifugal pump as well as a rotor as from the welding of replaceable pieces .
Another object of the present invention is to provide a method to easily repair the worn pieces of the pump, filling them with welding, and using any existing method: hand welding, semiautomatic welding or with multiple cycles of electrodes, even of different material of supply.
DETAILED DESCRIPTION OF THE INVENTION
The scroll and the rotor of the centrifugal pump (1) of the present invention are made from pieces (2) which are welded among themselves. The material of origin is iron, laminated and of any type of alloy, in respect with the characteristics of the usage. Once welded, they may be subject to thermal hardening treatments.
The scroll has two sides (3) with the shape of a washer, being coplanar and separated by a distance of the width of the rotor. In a portion (4) of its periphery, the closure of said width is provided with replaceable pieces and is completed with the discharge pipe (5) . Sides may be flat or evidence an inclination opening towards their centre, which presents a central hole (6) . Preferably, a closing ring (7) completes the central hole. The central hole is sufficiently big to allow the entrance or removal of the pump rotor. Each side has the necessary elements to strongly fix the rotor control as well as the suction hood: peripheric reinforcement, holes for lock bolts, etc.
Sides may be made of a single piece or of portions of pieces (8) welded together to obtain the same shape.
The periphery (9) of the scroll is made from metal pieces welded together. They may be flat (10) or evidence a curvature (11) equal to that of the sides. In general, pieces are rectangular, one of said sides is welded to the laterals and the other sides are welded to another similar piece at a certain angle so as to accompany the outer circumference of the laterals. Preferably, the metal is iron .
The pieces may have edges (12) prepared to facilitate the weldings .
The pieces may also be made of two layers of a metal of different structural property, for example a stronger iron, of great resistance to wear, on the inner side and a commercially iron, as support of the stronger iron layer. The joint between the two layers may be made by welding, riveted or by adhesive epoxy-like.
Another embodiment provides a single metal piece, wherein one of its surfaces has been subjected to a process of cementation or nitriding, obtaining a side with high strength iron and the opposite side with the common and less expensive iron as support of the high strong layer.
The present invention also comprises a method to manufacture and repair centrifugal pumps.
The method to manufacture the centrifugal pump consists of preparing a disassembly of the components of the centrifugal pump, rotor and scroll. These disassemblies will take place depending on where they are located in the pump already finished. For example, the disassemblies of the laterals of the scroll may be triangular sectors with a main radius equal to that of the case, and a minor radius equal to that of the central hole. The edges of the disassemblies may provide bevels for the welding. The disassemblies of the periphery of the scroll are square or rectangular pieces, wherein one of the sides has the width of the periphery of the scroll. As in the case of other pieces, the edges may provide bevels to facilitate the welding. The pieces of the periphery of the scroll may evidence a curvature to accompany the curvature of said periphery. Once the pieces are being located in position, the joints are filled with the sufficient material of the required supply.
The method to repair the centrifugal pump consists in detecting the worn piece or pieces, removing them from their position by oxyacetylene torch, weld cutting or abrasive disk. To replace them by equivalent pieces which are welded in the appropriate positions.

Claims

1. A centrifugal pump comprised of a scroll, a rotor, a case and an engine, WHEREIN said scroll and/or said rotor is composed by metal pieces joined together.
2. The centrifugal pump of claim 1, WHEREIN said pieces provide at least a bevel in at least one side.
3. The centrifugal pump of claim 1, WHEREIN said piece evidences a curvature.
4. The centrifugal pump of claim 1, WHEREIN the piece evidences a curvature.
5. The centrifugal pump of claim 1, WHEREIN the pice provides a side with greater anti-worn characteristics than the opposite side.
6. The centrifugal pump of claim 5, WHEREIN the side of greater anti-worn characteristics is obtained by cementation, nitriding or a similar process.
7. The centrifugal pump of claim 5, WHEREIN the piece has two layers, at least one of metal, both joined, where one layer provides greater anti-worn characteristics and are joined by welding, riveted or by an adhesive epoxy-like .
8. The centrifugal pump of claim 7, WHEREIN one of the layers is a hard ceramic.
9. A method to manufacture the centrifugal pump of claim 1, WHEREIN it comprises the steps of: preparing one piece of the disassembly, applying a shape depending where it is to be located; applying at least a spot welding to join each piece with the adjacent ones; and filling the joints with the sufficient material of the required supply.
10. A method to repair the centrifugal pump of claim
1, WHEREIN it comprises the steps of: removing the worn piece from its position by oxyacetylene torch, weld cutting or abrasive disk; and replacing same by an equivalent piece, which is welded in the appropriate position.
PCT/NO2016/050223 2015-11-11 2016-11-09 Centrifugal pump, methods for its manufacture and repair WO2017082737A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ARP20150103.675 2015-11-11
ARP150103675A AR102619A1 (en) 2015-11-11 2015-11-11 CENTRIFUGAL PUMP, MANUFACTURING AND REPAIR METHODS

Publications (1)

Publication Number Publication Date
WO2017082737A1 true WO2017082737A1 (en) 2017-05-18

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Family Applications (1)

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PCT/NO2016/050223 WO2017082737A1 (en) 2015-11-11 2016-11-09 Centrifugal pump, methods for its manufacture and repair

Country Status (2)

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AR (1) AR102619A1 (en)
WO (1) WO2017082737A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1462890A (en) * 1920-04-30 1923-07-24 Taylor Harvey Birchard Spiral casing
US2994348A (en) * 1957-09-11 1961-08-01 Dominion Bridge Co Ltd Method of reinforcing and welding toroidal or spiral shaped vessels
US4247250A (en) * 1979-09-04 1981-01-27 Allis-Chalmers Corporation Fabricated pump casing
WO2003098032A2 (en) * 2002-05-16 2003-11-27 Va Tech Hydro Gmbh & Co Spiral pertaining to a turbo-machine
WO2009146506A1 (en) * 2008-06-06 2009-12-10 Weir Minerals Australia Ltd Pump casing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1462890A (en) * 1920-04-30 1923-07-24 Taylor Harvey Birchard Spiral casing
US2994348A (en) * 1957-09-11 1961-08-01 Dominion Bridge Co Ltd Method of reinforcing and welding toroidal or spiral shaped vessels
US4247250A (en) * 1979-09-04 1981-01-27 Allis-Chalmers Corporation Fabricated pump casing
WO2003098032A2 (en) * 2002-05-16 2003-11-27 Va Tech Hydro Gmbh & Co Spiral pertaining to a turbo-machine
WO2009146506A1 (en) * 2008-06-06 2009-12-10 Weir Minerals Australia Ltd Pump casing

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Publication number Publication date
AR102619A1 (en) 2017-03-15

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