EP4348053A1 - Procédé de production d'un tube fendu ou d'une coupe à tube fendu pour une pompe à rotor humide, et pompe à rotor humide comprenant un tube fendu ou une coupe à tube fendu - Google Patents

Procédé de production d'un tube fendu ou d'une coupe à tube fendu pour une pompe à rotor humide, et pompe à rotor humide comprenant un tube fendu ou une coupe à tube fendu

Info

Publication number
EP4348053A1
EP4348053A1 EP22730499.5A EP22730499A EP4348053A1 EP 4348053 A1 EP4348053 A1 EP 4348053A1 EP 22730499 A EP22730499 A EP 22730499A EP 4348053 A1 EP4348053 A1 EP 4348053A1
Authority
EP
European Patent Office
Prior art keywords
composite material
fiber composite
inner layer
pump
split tube
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
EP22730499.5A
Other languages
German (de)
English (en)
Inventor
David KRILL
Axel Schunk
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 SE and Co KGaA
Original Assignee
KSB SE and Co KGaA
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
Priority claimed from DE102022113151.3A external-priority patent/DE102022113151A1/de
Application filed by KSB SE and Co KGaA filed Critical KSB SE and Co KGaA
Publication of EP4348053A1 publication Critical patent/EP4348053A1/fr
Pending legal-status Critical Current

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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0626—Details of the can
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14598—Coating tubular articles
    • B29C45/14622—Lining the inner or outer surface of tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
    • 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
    • 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
    • F05D2230/30—Manufacture with deposition of material
    • F05D2230/31—Layer deposition
    • 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
    • F05D2230/90—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
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced

Definitions

  • the invention relates to a method for producing a can or canned pot fes for a glandless pump, the canned or canned pot being formed from a media-tight inner layer and a fiber composite material surrounding the inner layer.
  • CFRP tubes carbon fiber reinforced plastic cans
  • the structure of known CFRP cans is based on two individual components, a sealing plastic liner and a pressure and form-stabilizing carbon fiber wound part that surrounds the plastic liner. During production, both parts can either be manufactured separately and then pushed into one another, or alternatively the plastic liner provided can be wrapped directly with the carbon fiber reinforced plastic material.
  • prefabricated tube made of a fiber composite material.
  • This prefabricated tube is then back-injected with a plastic material using an injection molding process, namely in the area of its inner diameter, in order to form the desired media-tight inner coating.
  • This procedure has the advantage that during the assembly or production of the cans or cans made of a fiber composite material, axial assembly forces no longer occur. This allows the wall thickness of the prefabricated pipe and the applied inner layer to be reduced. Overall, this results in a reduced overall wall thickness of the can or can, so that the cans or cans according to the invention not only increase the wear resistance, but also optimize the efficiency of the pump drive.
  • a composite material reinforced by means of carbon fibers and/or glass fibers can be used as the fiber composite material.
  • the carbon fibers and/or glass fibers can preferably be embedded in a plastic matrix.
  • a fiber composite material or fiber-reinforced composite material is only spoken of in general below, but the following statements apply regardless of whether a carbon-fiber-reinforced or glass-fiber-reinforced composite material is used.
  • the flinter spraying of the pre-manufactured tube leads to thermal heating of at least the inner wall of the pre-manufactured tube, as a result of which the matrix material used in the fiber composite material melts.
  • the back-injected tube cools down, this results in a positive or material connection between the fiber-reinforced composite material, in particular the matrix material used, and the plastic material applied by injection molding. Overall, this creates a particularly dimensionally stable and pressure-resistant can or can.
  • thermoplastic is conceivable as a suitable plastic matrix, for example a polyphenylene sulfide (PPS).
  • PPS polyphenylene sulfide
  • the plastic material used for the matrix of the composite material and the plastic used for the media-tight interior coating are identical or at least have very similar material properties.
  • both materials are characterized by almost identical or at least very similar melting points, so that when the plastic material for the inner layer is applied and the temperature required for this within the injection molding machine, melting of the matrix material is also ensured.
  • Very similar melting points are to be understood as meaning melting points which differ from one another by no more than 5%. Materials whose melting points differ by no more than 10% have also proven their worth. Also preferred are materials that have processing shrinkage that is matched to one another.
  • processing shrinkages are processing shrinkages where the processing shrinkage of the matrix material of the composite material is greater than or equal to the processing shrinkage of the plastic material for the inner layer.
  • the media-tight inner layer consists of a polyphenylene sulfide (PPS).
  • PPS polyphenylene sulfide
  • a band-like fiber composite material For the prefabrication of the pipe made from the fiber-reinforced composite material, it is proposed to wind a band-like fiber composite material onto a cylindrical mold body.
  • the ribbon-like composite material can be wound onto the shaped body in one or more layers.
  • a multi-layer winding With a multi-layer winding, a dimensionally stable, prefabricated tube can be produced inexpensively by repeated thermal heating of the matrix material.
  • different pipe sizes can be flexibly prefabricated and thus adapted to the desired pump and drive type.
  • a laser-supported, thermoplastic winding of the pipe is particularly suitable.
  • a tape of the fiber composite material is wound onto the shaped body (core) while at the same time being pressed using a pressure roller.
  • the composite material is thermally heated by laser light, which strikes the composite material in particular between the pressure roller and the shaped body.
  • the prefabricated tube is to be placed in a suitable injection molding machine, in particular a precision injection molding machine.
  • a suitable injection molding machine in particular a precision injection molding machine.
  • the prefabricated tube is placed flush against an outer wall of the injection mold, so that during back injection only the inner radius is injected with the desired plastic material and the winding body is supported against the occurring spray pressure.
  • Two separable slides are preferably used as the injection molding tool, which lean against the outer circumference of the prefabricated pipe. and enclose the pipe all around.
  • a tool core is inserted into the inner diameter of the prefabricated pipe, with the resulting gap between the tool core and the inner radius of the prefabricated pipe providing space for the injection of the liner material.
  • the present invention also relates to a glandless pump with a can or a can.
  • a can or the can is made of a fiber-reinforced, in particular carbon-fiber or glass-fiber-reinforced composite material.
  • the composite material is cohesively connected to a media-tight inner layer.
  • CFRP pipes for glandless pumps not only is there a form fit between the plastic liner and the composite material, but the pipe is also characterized by a material connection between the two individual components.
  • the resulting split tube or the split tube pot is not only more dimensionally stable, but also has a reduced wall thickness.
  • the can or the can pot is produced using the manufacturing method according to the invention, which is why the glandless pump is distinguished by the same advantages and properties as have already been described above with reference to the method according to the invention.
  • the glandless pump can be a centrifugal pump, preferably an inline pump, particularly preferably a heating circulating pump.
  • Figures 1a, 1b a cross section and longitudinal section through the can according to the invention or the can pot,
  • FIG. 2 shows a cross section through the can or can pot according to the invention clamped in an injection molding machine
  • the resulting can or the can pot is shown in Figures 1a, 1b.
  • Fi gur 1a shows a cross section through the can.
  • the two layers 1, 2 are illustrated in the schematic representation.
  • the reference number 1 designates the pipe prefabricated from a fiber composite material
  • the reference number 2 represents the inner layer 2 introduced by injection molding, ie the plastic liner.
  • a prefabricated CFRP tube 1 is initially used as the starting material.
  • the matrix of the composite material of the CFRP pipe 1 is based on the same or a very similar plastic material that has already been used in the production of conventional plastic liners.
  • PPS polyphenylene sulfide
  • the prefabricated CFRP tube 1 has a wall thickness of 0.4 mm or less, preferably 0.3 mm or less, ideally 0.2 mm or less, since it does not have to withstand any axial assembly force.
  • FIG. 2 shows a schematic representation of the can and the injection molding tool.
  • the outer wall of the tool formed by the two slides is marked with the dashed line 6 .
  • the two slides 3, 4 can be separated from one another along the parting plane 5 by being moved apart in the demolding direction indicated by the arrows.
  • a tool core 7 is pushed into the inner diameter of the CFRP tube 1 , the outer diameter of which is reduced compared to the inner diameter of the CFRP tube in order to provide space for the introduction of the plastic liner 2 .
  • the inserted CFRP pipe 1 is back-injected and the liner material 2 is applied to the inner radius of the inserted pipe 1 .
  • the pipe is exposed to high temperatures, whereby the matrix of the prefabricated pipe 1 melts in the edge area of the inner diameter and forms a form fit with the injected material 2 when it cools down.
  • the result is a one-piece CFRP can 1, 2 with an integrally bonded CFRP body 1.
  • the slides 3 , 4 are moved in the demolding direction and the tool core 7 is pulled orthogonally to the cutting plane or the finished can 1 , 2 is pushed off the tool core 7 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de production d'un tube fendu ou d'une coupe à tube fendu pour une pompe à rotor humide, le tube fendu ou la coupe à tube fendu étant constitué d'une couche interne étanche aux milieux et d'un matériau composite fibreux qui entoure la couche interne. Le procédé comprend les étapes consistant à fournir un tube préfabriqué constitué du matériau composite fibreux et à réaliser un processus de moulage par réinjection sur le tube préfabriqué à l'aide d'une matière plastique qui forme la couche interne étanche aux milieux.
EP22730499.5A 2021-05-27 2022-05-25 Procédé de production d'un tube fendu ou d'une coupe à tube fendu pour une pompe à rotor humide, et pompe à rotor humide comprenant un tube fendu ou une coupe à tube fendu Pending EP4348053A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102021113733 2021-05-27
DE102022113151.3A DE102022113151A1 (de) 2021-05-27 2022-05-24 Verfahren zur Herstellung eines Spaltrohrs bzw. eines Spaltrohrtopfes für eine Nassläuferpumpe sowie Nassläuferpumpe mit Spaltrohr bzw. Spaltrohrtopf
PCT/EP2022/064292 WO2022248598A1 (fr) 2021-05-27 2022-05-25 Procédé de production d'un tube fendu ou d'une coupe à tube fendu pour une pompe à rotor humide, et pompe à rotor humide comprenant un tube fendu ou une coupe à tube fendu

Publications (1)

Publication Number Publication Date
EP4348053A1 true EP4348053A1 (fr) 2024-04-10

Family

ID=82058112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22730499.5A Pending EP4348053A1 (fr) 2021-05-27 2022-05-25 Procédé de production d'un tube fendu ou d'une coupe à tube fendu pour une pompe à rotor humide, et pompe à rotor humide comprenant un tube fendu ou une coupe à tube fendu

Country Status (2)

Country Link
EP (1) EP4348053A1 (fr)
WO (1) WO2022248598A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU503129B1 (de) * 2022-12-04 2024-06-04 Wilo Se Verfahren und Vorrichtung zur Herstellung gewickelter Rohre aus Kunststoff, insbesondere von Spaltrohren für Nassläuferpumpen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1584452A2 (fr) * 2004-04-08 2005-10-12 Grundfos a/s Procédé pour le formage d'un élément creux de forme stable pourvu d'un fond et utilisation d'un tel élément

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63257451A (ja) * 1987-04-13 1988-10-25 Ebara Res Co Ltd マグネツトカツプリングの隔壁
DE4342649C1 (de) * 1993-12-14 1995-02-16 Munsch Kunststoff Schweistechn Magnetkreiselpumpe für aggressive Medien
CH688454A5 (de) * 1994-06-01 1997-09-30 Cp Pumpen Ag Spalttopf fuer eine Permanentmagnetkupplung.
ATE509417T1 (de) * 2007-09-21 2011-05-15 Grundfos Management As Spaltrohr sowie verfahren zum herstellen eines spaltrohres
DE102019134334A1 (de) * 2019-12-13 2021-06-17 Wilo Se Spaltrohr für eine Nassläuferpumpe und Verfahren zu dessen Herstellung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1584452A2 (fr) * 2004-04-08 2005-10-12 Grundfos a/s Procédé pour le formage d'un élément creux de forme stable pourvu d'un fond et utilisation d'un tel élément

Also Published As

Publication number Publication date
WO2022248598A1 (fr) 2022-12-01

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