EP4172505A1 - Pompe centrifuge servant à refouler des milieux contenant des matières solides - Google Patents

Pompe centrifuge servant à refouler des milieux contenant des matières solides

Info

Publication number
EP4172505A1
EP4172505A1 EP21737003.0A EP21737003A EP4172505A1 EP 4172505 A1 EP4172505 A1 EP 4172505A1 EP 21737003 A EP21737003 A EP 21737003A EP 4172505 A1 EP4172505 A1 EP 4172505A1
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
pump according
layer
rotating element
carbon
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
EP21737003.0A
Other languages
German (de)
English (en)
Inventor
Markus PITTROFF
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
Application filed by KSB SE and Co KGaA filed Critical KSB SE and Co KGaA
Publication of EP4172505A1 publication Critical patent/EP4172505A1/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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • 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
    • F04D29/2294—Rotors specially for centrifugal pumps with special measures for protection, e.g. against abrasion
    • 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
    • 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
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/22—Non-oxide ceramics
    • F05D2300/224—Carbon, e.g. graphite
    • 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
    • F05D2300/604—Amorphous
    • 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
    • F05D2300/611—Coating

Definitions

  • the invention relates to a centrifugal pump for pumping solids-containing media with an arrangement for reducing a backflow from a first space into a second space.
  • Centrifugal pumps have gaps through which a flow can flow at various points, for example between the impeller and the housing, where a pressure difference causes a leakage flow that is sometimes very lossy.
  • the seal With regard to the size of the gap, the seal here must be chosen so that it is neither too large, so that the efficiency of the centrifugal pump drops due to high losses over this gap, nor may the gap be too small, because otherwise there is a risk of that there is a start-up, i.e. contact between the rotating and the stationary component.
  • Such a seal can, for example, be a split ring seal arrangement.
  • Split ring seals are used in centrifugal pumps to seal spaces with different pressures.
  • the arrangement comprises a non-rotating element and a rotating element.
  • the non-rotating element can be, for example, a split ring which is arranged on the housing, or the housing itself or a housing part.
  • the rotating element can be, for example, a raceway which is arranged on the impeller, or the impeller itself or a part of the impeller, for example the cover disk of the impeller in the case of a closed impeller.
  • the gap that is formed between the rotating element and the non-rotating element acts as a throttle between the spaces of different pressures and prevents too high a flow from the space of higher pressure into the space of lower pressure.
  • this endeavor is opposed by the fact that a gap that is too small is very difficult to bring into line with the manufacturing tolerances and the operational influences. It is important to avoid contact between the elemen in order to prevent the rotating element from rubbing against the non-rotating element and thus to prevent wear. Due to the necessary tolerances in the manufacture of the individual components, there is a minimum gap width that precisely prevents elements from touching each other and thus causing friction and wear. During operation, however, particularly when starting up or shutting down the pump, situations repeatedly arise in which there is contact and then pressing or material wear occurs.
  • Wastewater in particular communal and industrial wastewater, is an example of a solid-containing medium.
  • This usually includes raw sewage (e.g. dirty water, faeces), sewage (mechanically purified water from sewage tanks), sludge (e.g. activated, fresh, digested and vaccinated sludge) and rainwater.
  • raw sewage e.g. dirty water, faeces
  • sewage mechanically purified water from sewage tanks
  • sludge e.g. activated, fresh, digested and vaccinated sludge
  • rainwater can have a very corrosive or abrasive effect on the centrifugal pumps used, in particular the components of the centrifugal pump that come into contact with the medium.
  • cast components are often used in centrifugal pumps.
  • a solid body in the desired shape is created from a liquid material after it has solidified.
  • the desired housing structures or impellers or other components of the centrifugal pump can thus be produced in a targeted manner.
  • Cast materials in centrifugal pump construction are usually iron-carbon alloys.
  • DE 10 2017 223602 A1 specifies a split ring / raceway pair of a centrifugal pump based on silicon carbide.
  • the hardness of the material is intended to protect the centrifugal pump from abrasive wear.
  • a ceramic element made of silicon carbide is inserted into a casting tool and then filled with a metallic casting material.
  • the object of the invention is to provide a centrifugal pump for pumping media containing solids. Damage to wear rings through abrasive wear is said to be effective be reduced.
  • the pump should be able to maintain its efficiency in operation for a long time.
  • the centrifugal pump should be characterized by high reliability and a long service life. You should also ensure easy assembly ge. Furthermore, the centrifugal pump should convince with the lowest possible manufacturing costs.
  • a centrifugal pump for conveying media containing solids with at least one arrangement for reducing a backflow has a non-rotating element which at least partially has a layer of carbon.
  • Such an arrangement for reducing a backflow can be designed according to the inven tion as a gap seal, which can be formed by a split ring and a raceway or by a split ring and an impeller.
  • This arrangement serves to seal off spaces with different pressures and acts as a throttle between these spaces.
  • a first space is to be understood as a space with higher pressure and a second space as a space with lower pressure.
  • the space of higher pressure is accordingly the space of the pressure connection and the spiral housing.
  • the space of lower pressure is the space of the suction area in front of the impeller.
  • the split ring is arranged by means of a press fit on the pump housing and is accordingly fixed as well as non-rotating. As such, the split ring is arranged directly on the pump housing. Furthermore, it forms a gap with a rotating counter element.
  • the rotating element can be, for example, a running ring which is arranged on the impeller, or the impeller itself or a part of the impeller, for example a radial and / or axial surface of the cover disk of the impeller in the case of a closed impeller.
  • the split ring advantageously has a carbon layer on a radial surface such as the inside of the split ring and / or on an axial surface such as the front side of the split ring. As a result, the hardness of an ordinary gap ring made of a cast material and / or a stainless steel material is increased enormously. The split ring thus receives effective protection against the abrasive effects of solid particles in the pumped medium.
  • the carbon layer is particularly advantageous in terms of touching or running against the counter-element. Due to the particularly smooth surface of the carbon layer and its extraordinary hardness, the split ring is insensitive to the rubbing action of a counter-element.
  • a second split ring is used to seal the running wheel against the bearing carrier cover.
  • This split ring also has a carbon layer that protects the split ring particularly against the abrasive effects of media containing solids and undesired contact with the impeller.
  • the split ring cooperates with a counter-element in order to prevent a particularly small gap to reduce a backflow from a space of higher pressure into a space of lower pressure of the pump.
  • This counter element can be designed in the form of a raceway ring which is arranged on a prepared surface of the cover disk of the impeller.
  • the counter-element can be designed in the form of a machined, radial and / or axial surface of the cover disk of the impeller.
  • a carbon layer is applied to the gap-forming surfaces. This ideally protects the rotating counter-element from the abrasive effects of the solid-containing medium.
  • wear rings made of common metallic materials, in particular cast materials and / or stainless steel materials, which are then coated with a particularly hard carbon fiber that protects against abrasion. Layer to be coated.
  • split rings can be produced from an inexpensive raw material that can be processed at the same time with known standard manufacturing methods.
  • the carbon layers are understood to be layers in which carbon is the predominant component.
  • the carbon layer can be applied, for example, with a PVD (Physical Vapor Deposition), a physical vapor deposition, for example by evaporation or sputtering) or a CVD (Chemical Vapor Deposition) method.
  • PVD Physical Vapor Deposition
  • physical vapor deposition for example by evaporation or sputtering
  • CVD Chemical Vapor Deposition
  • amorphous carbon layer in particular a tetrahedral, hydrogen-free amorphous carbon layer, which is also referred to as a ta-C layer.
  • the atomic bonds belonging to the crystal lattice of graphite (3 in total) are identified with the designation "sp2". There is an sp2 hybridization.
  • each carbon atom forms a tetrahedral arrangement with four neighboring atoms.
  • all atomic distances are equally small. There are therefore very high binding forces between the atoms, in all spatial directions. This results in the high strength and extreme hardness of the diamond.
  • the atomic compounds belonging to the crystal lattice of diamonds, four in total, are identified with the designation “sp3”. There is thus an sp3 hybridization.
  • the carbon layer consists of a mixture of sp3 and sp2 hybridized carbon.
  • This layer is characterized by an amorphous structure.
  • Foreign atoms such as hydrogen, silicon, tungsten or fluorine can also be built into this carbon network.
  • a carbon layer on a split ring By arranging a carbon layer on a split ring, an extremely smooth axial surface with non-stick properties is created without the need for complex mechanical reworking of the impeller.
  • several split rings can be introduced into a coating reactor, which is preferably designed as a vacuum chamber, where the ta-C coating is applied under moderate thermal stress.
  • the centrifugal pump according to the invention with at least one split ring is characterized by relatively low production costs.
  • the carbon layer is applied as a coating on a split ring.
  • the thickness of the layer is advantageously more than 0.5 ⁇ m, preferably more than 1.0 ⁇ m, in particular more than 1.5 ⁇ m. Furthermore, it proves to be advantageous if the carbon layer is less than 18 ⁇ m, preferably less than 16 ⁇ m, in particular less than 14 ⁇ m.
  • the carbon coating has an extremely smooth axial surface with non-stick properties, in which the mean roughness value R a of the carbon layer is less than 0.7 ⁇ m, preferably less than 0.5 ⁇ m, in particular less than 0.3 ⁇ m.
  • the ta-C coating has a very low coefficient of friction and, at the same time, very good chemical resistance.
  • the hardness of the coating comes very close to the hardness of diamonds, the hardness preferably more than 20 GPa, preferably more than 30 GPa, in particular more than 40 GPa and less than 120 GPa, preferably less than 110 GPa, in particular less than 100 GPa amounts to.
  • ta-C coatings are harder than aC: H layers.
  • ta-C does not contain any hydrogen. It can therefore be assumed that ta-C is more resistant than aC: H in contact with water (at temperatures above 80 ° C). In contact with other - especially polar - liquids that contain molecules in where hydrogen is bound, ta-C could also be more stable than aC: H.
  • the carbon layer is not applied directly to a split ring, but first an adhesion promoter layer is provided.
  • B. through the formation of stable carbides. Appropriately thin layers of chrome, titanium or silicon are used as bonding layers that meet these requirements. In particular, chromium and tungsten carbide have proven useful as adhesion promoters.
  • the coating has an adhesion promoter layer which preferably contains a chrome material.
  • the adhesion promoter layer is preferably more than 30% by weight, preferably more than 60% by weight, in particular more than 90% by weight, of chromium.
  • the ta-C coating according to the invention is a simple, quickly realizable and economical coating for wear rings in centrifugal pumps.
  • the coating according to the invention also has excellent sliding properties and good chemical resistance.
  • most metallic materials are characterized by a higher ductility in direct comparison to a ceramic material.
  • the advantage of the higher hardness due to the ta-C coating is based on the fact that small and large solid particles, which are often contained in the solid-containing media, can now have a greatly reduced abrasive effect on the gap seal, i.e. the split ring and a counter element. Due to the flow, these solid particles normally act like an abrasive.
  • the wear ring, bearing ring, impellers and / or suction-side housing parts that are coated with ta-C have an extremely hard protective layer against abrasion, which significantly increases their service life when pumping solids-containing media. PECVD / PACVD processes can preferably be used for coating.
  • the plasma is excited in the gas phase by coupling in pulsed DC voltage, medium-frequency (KHz range) or high-frequency (MHz range) power.
  • pulsed DC voltage medium-frequency (KHz range) or high-frequency (MHz range) power.
  • KHz range medium-frequency
  • MHz range high-frequency
  • PVD processes are used for coating. These processes are particularly simple and have a low process temperature. This technology leads to layers in which foreign atoms can also be incorporated as required. The process is preferably carried out in such a way that changes to the structure and dimensions of the materials to be coated (metallic, gray cast iron, etc.) are excluded.
  • the ta-C coating Compared to a CVD diamond layer, the ta-C coating has the advantage that the coating temperature for CVD diamond layers is 600 to 1000 ° C and for amorphous carbon layers such as ta-C is significantly below 500 ° C. This is of particular technical relevance for the coating of metallic materials. The production of PVD diamond layers is not possible.
  • FIG. 1 sectional view of a centrifugal pump for conveying solids-containing media with a closed impeller
  • FIG. 2 sectional view of a centrifugal pump for conveying solids-containing media with a closed impeller
  • FIG. 3 sectional view of a centrifugal pump for conveying solids-containing media with a closed single-channel wheel
  • Fig. 4 enlarged detail in the area of the suction mouth
  • FIG. 5 shows a detailed section of a stationary, non-rotating element.
  • the arrangement 13 25 shows a sectional illustration of a centrifugal pump for conveying media containing solids with two arrangements for reducing a backflow 13, 25 from a first space into a second space.
  • the arrangements 13, 25 include two non-rotating elements 2, 6 which interact with the closed impeller 4 in this exemplary embodiment.
  • This embodiment is a horizontally positioned volute casing pump.
  • the elements 2 and 6 are designed in this exemplary embodiment from as split rings.
  • the medium containing solids flows into the pump via the suction mouth 1, is subjected to kinetic energy by the closed impeller 4, which is connected to the mounting 12 with the shaft 9 in a rotationally fixed manner, and leaves the housing part 10, which in this example is the pump housing is formed via the pressure port 5.
  • the shaft 9 is rotatably supported by the ball bearings 8.
  • the housing part 7, which is designed as a pressure cover in this exemplary embodiment, closes the pump chamber in the direction of the drive.
  • the elements 2 and 6 are coated with a carbon layer, preferably with an amorphous carbon layer, in particular with ta-C.
  • a particularly ideal protection against abrasive wear which inevitably acts on the wear rings when pumping media containing solids, is achieved.
  • Due to the smooth and extremely hard ta-C coating on the wear rings there is no need for a ceramic material such as silicon carbide.
  • the wear rings can be made of a common cast material or a common stainless steel material and are protected from the abrasive effects of the solid-containing media by the ta-C coating.
  • a stationary, non-rotating element 2 In the area of the suction mouth 1, in the interior of the housing part 10, a stationary, non-rotating element 2, here designed as a split ring, is connected to the housing part 10 by means of a press fit.
  • the element 2 and the impeller 4 are spaced apart from one another, so that a gap is formed between the element 2 and the impeller 4, which gap functions as a sealing gap with geometrically identical surfaces.
  • 2 shows a sectional illustration of a centrifugal pump for conveying media containing solids with an arrangement for reducing a backflow 13 from a first space into a second space.
  • the arrangement 13 comprises a stationary, non-rotating element 2 which, in this exemplary embodiment, interacts with the closed paddle wheel 4.
  • the element 2 is removablebil det in the example as a split ring.
  • the solid-containing medium flows into the pump via the suction mouth 1, is subjected to kinetic energy by the closed impeller 4, which is connected to the shaft 9 in a rotationally fixed manner, and leaves the housing part 10 via the pressure port 5.
  • the shaft 9 is supported by the ball bearings 8 rotatably mounted.
  • the element 2 is coated with a carbon layer, preferably with an amorphous carbon layer, in particular special with ta-C. A particularly ideal protection against abrasive wear and also against the closed single-blade wheel running against the split ring is thus achieved.
  • the arrangement 13 comprises a stationary, non-rotating element 2 which, in this exemplary embodiment, interacts with the closed Einka nalrad 4.
  • the element 2 is designed as an L-shaped split ring which is coated on the surface with ta-C.
  • the solids-containing medium flows into the pump via the suction mouth 1, is acted upon by the closed impeller 4, which is non-rotatably connected to the shaft 9, with movement energy and leaves the housing part 10, which is designed as a pump housing, via the pressure port 5.
  • the shaft 9 is rotatably supported by the ball bearings 8.
  • the L-shaped element 2 which is also referred to as an angle split ring, is coated with a carbon layer, preferably with an amorphous carbon layer, in particular with ta-C. This is a particularly ideal protection against abrasive wear and also reached against the running of the closed single impeller 4 against the gap ring.
  • the centrifugal pump has an arrangement for reducing a backflow 13 in the form of a gap seal.
  • This includes a rotating construction part 14, which is designed as a raceway and a non-rotating component 2, which is designed as a gap ring.
  • the rotating component 14 is arranged on a radial outside of the cover disk 3 of the impeller 4.
  • the rotating component 14 thus rotates with the impeller 4.
  • the non-rotating component 2 is arranged on the housing part 10 and has a radial inner side of the ring as a guide which interacts with the radial outer side of the rotating component 14, which is designed as an angular running ring in the exemplary embodiment and forms the gap seal.
  • element 2 and rotating component 14 are coated with a carbon layer, preferably with an amorphous carbon layer, in particular with ta-C. This provides particularly ideal protection against abrasive wear.
  • a further arrangement 20 which comprises a rotating element 22 and a non-rotating element 21.
  • the rotating element 22 is designed as a ring which is arranged on the axial end face of the cover disk 3 and is also referred to as an angular raceway.
  • the rotating element 22 has a projection 19 which extends in the axial direction and which engages in a groove 15 in the cover disk 3.
  • the non-rotating element 21 is designed as an axially displaceable ring which is guided by a surface 16 of the housing part 10 against radial displacement.
  • a force-generating element 17 exerts a force on the non-rotating element 21 and presses the non-rotating element 21 against the rotating element 22.
  • the force-generating element 17 is designed as a spring.
  • a corrugated spring is used.
  • a sinusoidal spring or a group tion can be used.
  • the non-rotating element 21 is sealed off from the housing part 10 by a sealing element 18.
  • the sealing element 18 is preferably an O-ring.
  • the rotating element 22 and the non-rotating element 21 are in the execution example made of a stainless steel material that is coated according to the invention with ta-C be.
  • the two axially facing end faces of the rotating element 22 and of the non-rotating element 21 are pressed against each other by the force generating element 17. This creates a minimal gap.
  • the ta-C coating minimizes friction.
  • a lubricating film of conveying medium forms in the gap between the contacting surfaces of the rotating element 22 and the non-rotating element 21.
  • the arrangement 20, together with the device 13, prevents a backflow from a pressure chamber 5 of the pump into a suction chamber 1 of the centrifugal pump.
  • Fig. 5 shows a detailed section of a non-rotating element 2 which is coated on an axial surface 23 and on a radial surface 24 with a carbon layer be.
  • split rings can be made from a common cast material or a stainless steel material and given wear-resistant properties by means of ta-C coating.

Landscapes

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

Abstract

L'invention concerne une pompe centrifuge servant à refouler des milieux contenant des matières solides. La pompe centrifuge dispose d'au moins un système de réduction d'un reflux (13, 20, 25) depuis une premier chambre vers une deuxième chambre. Ledit système (13, 20, 25) comprend au moins un élément non rotatif (2, 6, 21) qui coopère avec au moins un élément complémentaire rotatif (14, 22). L'élément (2, 6, 21) comporte au moins en partie une couche constituée d'une couche de carbone.
EP21737003.0A 2020-06-26 2021-06-23 Pompe centrifuge servant à refouler des milieux contenant des matières solides Pending EP4172505A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020003855.7A DE102020003855A1 (de) 2020-06-26 2020-06-26 Kreiselpumpe zur Förderung feststoffhaltiger Medien
PCT/EP2021/067138 WO2021260000A1 (fr) 2020-06-26 2021-06-23 Pompe centrifuge servant à refouler des milieux contenant des matières solides

Publications (1)

Publication Number Publication Date
EP4172505A1 true EP4172505A1 (fr) 2023-05-03

Family

ID=76744811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21737003.0A Pending EP4172505A1 (fr) 2020-06-26 2021-06-23 Pompe centrifuge servant à refouler des milieux contenant des matières solides

Country Status (5)

Country Link
US (1) US20230258187A1 (fr)
EP (1) EP4172505A1 (fr)
CN (1) CN115698512A (fr)
DE (1) DE102020003855A1 (fr)
WO (1) WO2021260000A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022118557A1 (de) * 2022-07-25 2024-01-25 KSB SE & Co. KGaA Kreiselpumpe mit Gleitringdichtung zur Abdichtung des Laufradspaltes sowie Verfahren zur Herstellung eines Pumpenlaufrades

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2051011A1 (de) 1970-10-17 1972-04-20 Loewe Pumpenfabrik Gmbh Spaltabdichtung für Kreiselpumpen und dergl
DE3513116A1 (de) 1985-04-12 1986-10-23 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Spaltdichtung an laufraedern von kreiselpumpen
DE3708956C1 (de) 1987-03-19 1988-03-17 Handtmann Albert Elteka Gmbh Spaltringdichtung einer Kreiselpumpe
US7458765B2 (en) * 2005-09-23 2008-12-02 Fraunhofer Usa Diamond hard coating of ferrous substrates
DE102012218861A1 (de) * 2012-10-16 2014-04-17 Mahle International Gmbh Pumpe
US9677560B1 (en) * 2014-07-11 2017-06-13 Summit Esp, Llc Centrifugal pump impeller support system and apparatus
KR101670230B1 (ko) * 2016-06-03 2016-11-09 (유)한성산기 무급수 구동이 가능한 펌프
DE102017223602A1 (de) * 2017-12-21 2019-08-01 KSB SE & Co. KGaA Kreiselpumpe mit Gussbauteil
DE102018214650A1 (de) 2018-08-29 2020-03-05 KSB SE & Co. KGaA Strömungsführende Vorrichtung

Also Published As

Publication number Publication date
WO2021260000A1 (fr) 2021-12-30
DE102020003855A1 (de) 2021-12-30
CN115698512A (zh) 2023-02-03
US20230258187A1 (en) 2023-08-17

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