EP1972788B1 - Carter de pompe avec couvercle unique et plate - Google Patents

Carter de pompe avec couvercle unique et plate Download PDF

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Publication number
EP1972788B1
EP1972788B1 EP07104824.3A EP07104824A EP1972788B1 EP 1972788 B1 EP1972788 B1 EP 1972788B1 EP 07104824 A EP07104824 A EP 07104824A EP 1972788 B1 EP1972788 B1 EP 1972788B1
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EP
European Patent Office
Prior art keywords
centrifugal pump
pump according
cover part
outer casing
main walls
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.)
Active
Application number
EP07104824.3A
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German (de)
English (en)
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EP1972788A1 (fr
Inventor
Erik Christiaan Van Der Blom
Hasan Hüseyin Bugdayci
Jasper Koot
Edwin Kanters
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.)
IHC Holland lE BV
Original Assignee
IHC Holland lE BV
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 IHC Holland lE BV filed Critical IHC Holland lE BV
Priority to EP07104824.3A priority Critical patent/EP1972788B1/fr
Priority to CN2008100876091A priority patent/CN101270762B/zh
Publication of EP1972788A1 publication Critical patent/EP1972788A1/fr
Application granted granted Critical
Publication of EP1972788B1 publication Critical patent/EP1972788B1/fr
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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
    • F04D29/426—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
    • 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
    • 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

Definitions

  • the invention is related to a centrifugal pump, comprising an outer casing, an inner casing contained in the outer casing, an impeller rotatably supported within the inner casing, an outer casing inlet concentrically arranged with respect to the impeller as well as a tangential outer casing outlet, said outer casing comprising a cup shaped part as well as a cover part mounted onto the cup shaped part, which cover part comprises at least one reinforcement ring.
  • centrifugal pumps are known.
  • the outer casing of said prior art centrifugal pump has an inlet cover which extends between the inlet and the cover part.
  • said cover part has a relatively large opening, closed by the inlet cover.
  • the opening in the cover part is made free which allows the impeller to be removed through said opening.
  • the impeller may be exchanged without removing the cover part itself.
  • the inlet cover is positioned again between the cover part and the inlet so as to close the outer casing.
  • DE 629 780 C relates to centrifugal pumps, particularly centrifugal pumps with a angular (eckigem) housing.
  • the interior of the housing is covered with liners (Ausuccsmaschine).
  • the angular housing is essential in view of the wedge-wise clamping (Keil strict) of the liners.
  • the object of the invention is therefore to provide a centrifugal pump of the type described before which does not have these disadvantages. This object is achieved with a centrifugal pomp according to claim 1.
  • the unitary lay out of the outer cover part makes it necessary to remove said cover part as a whole in case the impeller needs to be repaired or exchanged.
  • the cover part including the obstacle formed by the reinforcement ring which stands off from the cover part is completely out of the way, the room for handling the impeller is greatly improved.
  • the unitary cover part according to the invention may be carried out in several ways; for instance the cover part may comprise a single plate element or a single layered element.
  • the cover part may comprise several materials.
  • said cover part comprises a plastic material.
  • centrifugal pump is described in European patent application 06113796 , which is non published prior filing. Pumps of this type can be used in dredging or mining operations.
  • the materials obtained may comprise highly abrasive components. Moreover, these materials may comprise lumps of material which, upon transportation through the inner casing in the process of pumping these materials, will generate considerable impact forces. Also, in the process of performing dredging or mining operations, pressure surges may occur within the inner casing.
  • centrifugal pumps of this type need an inner casing which consists of a very hard material, for instance hardened steel or cast iron.
  • materials such as cast iron and hardened steel have favorable characteristics for withstanding the abrasive character of the pumped materials, they are less fit for accommodating impact forces such as caused by pressure surges or when pumping lumps of materials. This is caused by the fact that materials such as hardened steel or cast iron cannot yield very well. This means that they are not able to adapt to this type of loading.
  • there is a certain risk of ruptures occurring in the inner casing in those circumstances where pressure surges occur and lumps of materials are traveling through the inner casing. Subsequently, the materials being pumped may be flung into the surroundings, leading to unacceptable high risks.
  • the outer housing has been provided.
  • said outer casing comprises a material which is well fit for accommodating the impacts generated by those materials.
  • the outer casing is usually constructed from a tough and yieldable material.
  • the outer casing is constructed in such a way that it is fit for maintaining an internal overpressure.
  • the non published prior European patent application proposes to provide an outer casing consisting of a plastic material.
  • the outer casing may either comprise two cup shaped outer casing halves, or a single cup shaped outer casing part and a generally flat cover part.
  • the cup shaped outer casing part has a dimensional stability which is sufficient even in case said part consists of a plastic material. It is well-known that in general a plastic material has a lower modulus of elasticity than a steel material, but nevertheless the cup form per se provides the required stiffness.
  • Such cover part may have a generally flat shape.
  • a flat part generally has a lower dimensional stability, which means that such part will more readily deform, e.g. bulge out when an internal overpressure reigns within the outer casing, than the cup shaped outer casing part.
  • small deformations are acceptable, and will even occur in an outer casing fully consisting of steel or cast iron material, the deformations as occur in a flat cover part may become too large. However, such large deformations are unacceptable, as the pumping efficiency will be greatly reduced thereby.
  • the object of the invention is therefore to provide a centrifugal pump of the type described before, which on the one hand is fit for application in the process of pumping abrasive materials and for withstanding impact loads, but which is less heavy and/or less costly. Furthermore, an object of the invention is to provide a pump housing having a cover part with a less complicated structure. This object is achieved in that the cover part comprises a single element which extends as a unity continuously between the cup shaped part and the outer casing inlet.
  • the single piece cover part that is without the prior art removable inlet lid, can be carried out in a relatively simple way and with less cost. This is largely due to the fact that a separate inlet lid, which has to be connected to the main cover through a ring of bolt connections, has been omitted.
  • the cover part may comprise a single plate element or a single layered element.
  • the cover part comprises a plastic material.
  • the cover part may comprise at least one reinforcement ring near the outer circumference of the cover part.
  • the stiffness thereof against out of plane deformations is greatly increased.
  • the cover part when loaded by an internal overpressure within the outer casing, will only deform to an extent which is acceptable from an operational point of view.
  • a centrifugal pump having a cup shaped outer casing part and a generally flat cover part may comprise a plastic material in the cover part.
  • the cup shaped outer casing part may comprise a plastic material as well, but in an alternative embodiment said cup shaped outer casing part may comprise a steel material or a cast iron material.
  • At least a reinforcement ring is provided at or near the outer circumference of the cover part.
  • Such reinforcement ring increases the resistance against radial enlargement of the outer casing under the influence of internal overpressures.
  • the stiffening of the outer casing thus obtained also prevents the occurrence of internal leakages.
  • the cover part comprises a centrally located inlet opening, and at least a reinforcement ring is provided at or near the inlet opening. In case overpressures occur within the outer casing, the reinforcement rings in question will be loaded by tensile forces, which forces can be accommodated conveniently by the closed form of the rings in question.
  • the stiffness of the cover part is favourably influenced in case one reinforcement ring is positioned adjacent one of the main sides of said cover part, and another reinforcement ring is positioned adjacent the other main side. Consequently, in a direction transverse with respect to said main sides, the reinforcement rings are positioned at a distance from each other.
  • the reinforcement ring or rings should be able to withstand deformations, in particular in circumferential direction.
  • the hoop stiffness should be sufficiently high.
  • the reinforcement rings preferably comprise a fiber material.
  • Such fiber material may for instance consist of carbon fibers or glass fibers, which are wound in circumferential direction.
  • the cover part comprises generally parallel main walls which are at the distance from each other.
  • said main walls may comprise a plastic material.
  • the walls each may comprise a laminar structure.
  • the walls may comprise a composite material.
  • Said fibers may comprise glass fibers or carbon fibers; also mixed fibers are possible. With the aim of improving the impact resistance of the outer casing, the glass fibers are positioned on the outside.
  • the walls may be interconnected through a sandwich core.
  • sandwich core may take several forms, for instance the walls may be interconnected through ribs.
  • the orientation of the ribs may be manifold, for instance radially oriented, or they may cross each other.
  • An outer peripheral circumferential ring may extend between the external circumferences of the walls.
  • an inner peripheral circumferential ring may extend between the inner circumferences, as defined by said central openings, of the walls.
  • the cover part comprise may a steel material.
  • a combination of steel and plastics material is possible, such as a laminate of steel and plastic sheets.
  • the centrifugal pump as shown in figures 1-4 comprises an outer casing 1, in which the inner casing 2 as visible in figures 2 and 4 is contained. Said inner casing 2 has a tangentially oriented outlet 4. An impeller 5, having a suction inlet 3,is rotatably supported within the inner casing 2 around axis 24 by means of a drive shaft 6. Said drive shaft 6 in turn is rotatably mounted in a support (not shown), and connected to a drive motor (not shown).
  • the outer casing 1 has an outer casing inlet opening 7 which is coaxial to the inlet 3 of the impeller 5.
  • the diameter of the inlet opening thereof is smaller than the external diameter of the impeller 5.
  • the outer casing 1 has a shaft opening 8 through which the drive shaft 6 extends.
  • the drive shaft 6 is sealed with respect to the outer casing 1.
  • the outer casing 1 has a tangentially oriented outer casing outlet opening 10, which is coaxial to the outlet 4 of the inner casing 2.
  • Mounting supports 11 are arranged on the outer casing 1 so as to support the pump, for instance with respect to the deck of a ship.
  • a pipe 12 (only the extreme end of which is shown in the figures) is positioned at a certain distance from the centrifugal pump 1.
  • said pipe 12 can be connected to the inlet opening 7 of the outer casing 1, as shown in figure 4 , and in particular to the suction mouth wear ring 68 which by means of the suction seal 69 is sealed with respect to the impeller 5.
  • said intermediate pipe piece has been removed so as to enable the displaced position of the cover part 14 shown in figure 4 .
  • the outer casing 1 consists of a cup shaped part 13 and a generally flat cover part 14.
  • the mounting supports 11 addressed before are attached to said cup shaped part 13.
  • the cover part 14 is supported, e.g. with respect to the deck of the ship, by means of the support structure 15.
  • This support structure 15 comprises two A-frames 16, which by means of rollers 17 are displaceable to and fro on the rails 18.
  • Onto the A-frames 16, a ring sector 19 is mounted which is concentric with respect to the axis 24.
  • Said ring sector 19 comprises slits 20, within which pins 21 mounted on the cover part 2 are supported.
  • the cover part 2 comprises a bottom support sector rim 25 which is concentric with respect to the axis 24.
  • bottom support sector rim 25 in turn is slidably held within bottom support sector profile 26, which has in cross-section a radially inward oriented U-shape.
  • cover part 2 is rotatably supported around axis 24 between the fitted position shown in figures 1, 2 and 3 , and the rotated, detached position as shown in figure 4 .
  • a wear plate 62 and a shoulder plate 66 are connected to the inner surface of the cover part 14, next to the impeller 2.
  • the cover part 14 comprises a radially outward facing closure rim 22 which is positioned behind the bottom support sector rim 25 (see figure 2 ).
  • Said closure rim 22 is partly of a slight spiral shape with respect to the axis 24, and comprises a spiral shaped portion 27 extending over about 270 degrees with respect to the axis 24, and a straight portion 28.
  • the spiral shaped portion 27 ends at the top of the cover portion 2 which adjoins the outlet opening 10 in the cup shaped part 1.
  • the closure rim 22 comprises a flange portion 57 which extends between the spiral shaped portion 27 and the straight portion 28, at the location of the tangential outlet 4.
  • Said mounting flange is provided with a series of holes 58, the purpose of which will be described below.
  • the cup shaped part 13 is provided with a profile 23 of a similar spiral and straight shape, which profile 23 defines, as seen in figure 2 , a U-shaped cross-section facing radially inward and defining a groove 33.
  • Said profile has a spiral shaped portion 29 and a straight portion 30.
  • the profile does not extend over the full circumference of the cup shaped part 13.
  • the circumferential portion 59 extending between the spiral shaped portion 29 of the profile 23, and the straight portion 30 of the profile 23, lacks said profile. Instead, said circumferential portion 59 comprises screw threaded holes, the purpose of which will be described below.
  • a tooth wheel 31 is rotatably mounted on the spiral shaped part 29 of the profile 23, and a corresponding arc shaped tooth rack 32 is mounted on the cover part 14. Said tooth rack 32 is concentric with respect to the axis 24.
  • a wear plate 63 and shoulder plate 67 are connected to the cup shaped part 13, next to the impeller.
  • the rim 22 of the cover part 14 now becomes gradually engaged in the groove 33 of the profile 23, whereby in particular the spiral shaped portion 27 of the rim 22 is moved into the spiral shaped portion 29 of the profile 23, and the straight portion 28 of the rim 22 is moved into the straight portion of the profile 23.
  • bolts 61 are inserted through the holes 58 in the flange portion 57 of the cover part 14, and threaded into the screw threaded holes 60 in circumferential portion 59 of the cup shaped part 13.
  • Disasssembling of the cover part 14 from the cup shaped part 13 occurs in the opposite way.
  • the impeller 5 may be exchanged, if necessary.
  • the wear plate 62 on the inner wall 35 of the cover part 14 may be removed, as well as the wear plate 63 (the latter one after removal of the impeller 2).
  • the cover part 14 comprises an inner main wall 35 and an outer main wall 36, between which a core 37 is present which can also be carried out in a plastic material.
  • the inner main wall comprises an integral tubular part 38 (defining the inlet opening 7 of the centrifugal pump) onto which the pipe 12 (see figures 1-4 ) can be fitted by means of an intermediate pipe piece.
  • Said tubular part 38 extends along and is connected to the opening 46 of the outer main wall 36.
  • the outer main wall 36 comprises an axially extending edge 39 provided with a radially extending flange 40, connected to the corresponding radially extending flange 41 of the inner main wall 35.
  • the flanges 40, 41 together constitute the rim 22 addressed before.
  • the reinforcement rings 42, 43 have been provided.
  • the outer reinforcement ring 42 is positioned against the inner surface of the axially extending edge 39, and extends between the main walls 35, 36.
  • the inner reinforcement ring 43 is positioned against the outer surface of the tubular portion 38, and extends between the outer main wall 36 and a ridge 44 of the inner main wall 35.
  • both rings 42, 43 are of a tubular shape, although other shapes are possible as well.
  • the rings 42, 43 comprise a high strength fibre material, such as carbon fibres or glass fibres, which are wound in the circumferential direction.
  • the rings 42, 43 provide the cover part 14 with a considerable stiffness, which means that deformations of said cover part 14 under internal overpressure remain within acceptable limits during service of the centrifugal pump in question.
  • cover part 14 is related to the fact that the dimension thereof in axial direction is limited in comparison to the axial dimension of the state of the art steel cover parts.
  • Said steel cover parts are provided with reinforcement rings which extend from the outer main wall thereof, resulting in a considerable axial dimension of said cover part.
  • the cup shaped part 13 of the outer casing 1 can consist of a plastic material as well.
  • said cup shaped part 13 comprises an outer cup shaped element 50 an inner cup shaped and 51, each having a bottom 52 respectively 53 as well as walls 54 respectively 55.
  • the walls 54, 55 are connected to each other, e.g. by gluing, whereas the bottom is 52, 53 interconnected through a core 56.
  • the profile 23, comprising the inwardly facing U-shaped groove 33, is integral with the outer cup shaped element 50.
  • an inflatable sealing ring 64 is present between the cover part 14 and the cup shaped part 13.
  • Said sealing ring 64 is fitted within a slot 70 of the cup shaped part 13, which slot 70 opens out next to the groove 33 of the profile 23.
  • Said slot 70, together with the sealing ring 64, extends fully around the circumference of the cup shaped part 13, so as to obtain the required tightness of the inner space of the outer casing 1.
  • the sealing ring 64 is a labyrinth type sealing ring having a series of external ridges 71, which seal against the surface of the cover part 14.
  • the sealing action of the sealing ring 64 it is obtained by inflating said ring.
  • the step of inflating is obtained by feeding a pressure gas into the internal chamber 65 of the sealing ring 64.
  • first of all the sealing ring 64 is deflated by letting the pressure gas flow out of the chamber 65.
  • the deflated state of the sealing 64 is shown in figure 9 , which also shows the cover part 14 rotated in such a way that the spiral shaped portion 27 thereof has just been rotated out of the groove 33 of the profile 23 of the cup shaped part 13.
  • FIG. 10 shows a centrifugal pump with an external steel outer casing 1, in particular a steel cup shaped part 13 and a steel plate shaped cover part 14.
  • Said cover part 14 stretches as a unity from the cup shaped part 13, in particular from the bolted connection 80, towards the inlet opening 7 of the outer casing 1.
  • the cross sectional dimensions or diameter of the central opening 70 in the cover part 14 are smaller than the outer diameter of the impeller 5.

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

Claims (32)

  1. Pompe centrifuge comprenant un carter externe (1), un carter interne (2) contenu dans le carter externe (1), un impulseur (5) supporté, en rotation, à l'intérieur du carter interne (2), une entrée de carter externe (7) agencée, de manière concentrique, par rapport à l'impulseur (5) ainsi qu'une sortie de carter externe tangentielle (4), ledit carter externe (1) comprenant une partie en forme de coupelle (13) ainsi qu'une partie de couvercle (14) montée sur la partie en forme de coupelle (13), laquelle partie de couvercle (14) comprend au moins une bague de renforcement (42, 43), caractérisée en ce que ladite partie de couvercle (14) comprend un élément unique qui s'étend sous la forme d'une unité, de manière continue, entre la partie en forme de coupelle (13) et une entrée de carter externe (7), dans laquelle ladite partie de couvercle (14) comprend une matière plastique, et dans laquelle la partie de couvercle (14) comprend une ouverture d'entrée (7) positionnée de manière centrale, dans laquelle au moins une bague de renforcement (43) est prévue au niveau de ou à proximité de l'ouverture d'entrée (7).
  2. Pompe centrifuge selon la revendication 1, dans laquelle la partie de couvercle (14) comprend un élément de plaque unique ou un élément à couche unique.
  3. Pompe centrifuge selon la revendication 1 ou 2, dans laquelle au moins une bague de renforcement (42) est prévue au niveau de ou à proximité de la circonférence externe de la partie de couvercle (14).
  4. Pompe centrifuge selon la revendication 3, la partie de couvercle (14) ayant des côtés principaux opposés (35, 36), dans laquelle l'une des bagues de renforcement est positionnée de manière adjacente à l'un desdits côtés principaux et l'autre des bagues de renforcement est positionnée de manière adjacente à l'autre côté principal.
  5. Pompe centrifuge selon la revendication 3, la partie de couvercle (14) ayant des côtés principaux opposés (35, 36), dans laquelle, dans une direction transversale par rapport auxdits côtés principaux (35, 36), les bagues de renforcement (42, 43) sont positionnées à une certaine distance l'une de l'autre.
  6. Pompe centrifuge selon l'une quelconque des revendications 1 à 5, dans laquelle les bagues de renforcement (42, 43) comprennent un matériau fibreux.
  7. Pompe centrifuge selon la revendication 6, dans laquelle le matériau fibreux comprend des fibres de carbone.
  8. Pompe centrifuge selon la revendication 7, dans laquelle le matériau fibreux comprend des fibres de verre.
  9. Pompe centrifuge selon la revendication 7 ou 8, dans laquelle le matériau fibreux est enroulé dans la direction circonférentielle.
  10. Pompe centrifuge selon l'une quelconque des revendications 1 à 9, dans laquelle la partie de couvercle (14) comprend des parois principales (35, 36) généralement parallèles qui sont à une certaine distance les unes des autres, lesdites parois principales (35, 36) comprenant une matière plastique.
  11. Pompe centrifuge selon la revendication 10, dans laquelle les parois principales (35, 36) comprennent chacune une structure laminaire.
  12. Pompe centrifuge selon la revendication 11, dans laquelle les parois principales (35, 36) comprennent un matériau composite.
  13. Pompe centrifuge selon la revendication 11 ou 12, dans laquelle les parois principales (35, 36) comprennent des couches de matière plastique renforcée en fibres.
  14. Pompe centrifuge selon la revendication 13, dans laquelle les parois principales (35, 36) comprennent des couches orientées de manière radiale et/ou tangentielle.
  15. Pompe centrifuge selon l'une quelconque des revendications 10 à 14, dans laquelle les parois principales (35, 36) sont interconnectées par le biais d'une âme en sandwich (37).
  16. Pompe centrifuge selon l'une quelconque des revendications 10 à 15, dans laquelle les parois principales (35, 36) sont interconnectées par le biais de nervures.
  17. Pompe centrifuge selon la revendication 16, dans laquelle les nervures sont orientées de manière radiale.
  18. Pompe centrifuge selon l'une quelconque des revendications 10 à 17, dans laquelle une bague circonférentielle périphérique externe (42) s'étend entre ou à proximité des circonférences externes (40, 41) des parois principales (35, 36).
  19. Pompe centrifuge selon l'une quelconque des revendications 10 à 18, dans laquelle les parois principales (35, 36) comprennent chacune une ouverture centrale (38, 46), lesdites ouvertures centrales étant alignées et une bague circonférentielle périphérique interne (43) s'étend entre ou à proximité des circonférences internes, telles que définies par lesdites ouvertures centrales (38, 46), des parois principales (35, 36).
  20. Pompe centrifuge selon l'une quelconque des revendications 1 à 18, dans laquelle au moins une bague de renforcement (42, 43) est contenue à l'intérieur du contour de la partie de couvercle (14), tel que défini par les parois principales (35, 36).
  21. Pompe centrifuge selon l'une quelconque des revendications 1 à 20, dans laquelle le carter externe (1) entoure le carter interne (2) d'une manière étanche au fluide.
  22. Pompe centrifuge selon les revendications 1 ou 2, dans laquelle la partie de couvercle (14) comprend un matériau en acier.
  23. Pompe centrifuge selon l'une quelconque des revendications précédentes, comprenant une bague d'étanchéité (64) entre la partie en forme de coupelle (13) et la partie de couvercle (14), dans laquelle ladite bague d'étanchéité (64) est expansible.
  24. Pompe centrifuge selon la revendication 23, dans laquelle la bague d'étanchéité (64) comprend une chambre interne (65) qui peut être raccordée à une source de gaz pour gonfler la bague d'étanchéité (64).
  25. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle le carter externe (1) comprend au moins un raccordement (47) pour maintenir une surpression à l'intérieur dudit carter externe (1).
  26. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle le carter externe (1) comprend un couvercle d'arbre (9) à travers lequel l'arbre (6) s'étend d'une manière étanche au fluide.
  27. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle la partie de couvercle (14) a une forme généralement plate.
  28. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle une plaque d'usure (62) est prévue sur la surface interne de la partie de couvercle (14).
  29. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle une plaque d'usure (63) est prévue sur la surface interne de la partie en forme de coupelle (13).
  30. Pompe centrifuge selon les revendications 28 et 29, dans laquelle des plaques d'épaulement (66, 67) sont prévues entre les plaques d'usure (62, 63) respectives et le carter interne (2).
  31. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle la partie de couvercle (14) chevauche l'impulseur (5), lorsque l'on l'observé dans la direction radiale.
  32. Pompe centrifuge selon l'une quelconque des revendications précédentes, dans laquelle la partie de couvercle (14) a une ouverture centrale (70), dont les dimensions transversales sont inférieures au diamètre externe de l'impulseur (5).
EP07104824.3A 2007-03-23 2007-03-23 Carter de pompe avec couvercle unique et plate Active EP1972788B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07104824.3A EP1972788B1 (fr) 2007-03-23 2007-03-23 Carter de pompe avec couvercle unique et plate
CN2008100876091A CN101270762B (zh) 2007-03-23 2008-03-20 具有平直的单件式封盖部件的离心泵

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EP07104824.3A EP1972788B1 (fr) 2007-03-23 2007-03-23 Carter de pompe avec couvercle unique et plate

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EP1972788A1 EP1972788A1 (fr) 2008-09-24
EP1972788B1 true EP1972788B1 (fr) 2018-08-29

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CN101270762A (zh) 2008-09-24
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