EP0206031B1 - Recouvrement en caoutchouc renforcé pour carter de pompe centrifuge - Google Patents

Recouvrement en caoutchouc renforcé pour carter de pompe centrifuge Download PDF

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Publication number
EP0206031B1
EP0206031B1 EP86107645A EP86107645A EP0206031B1 EP 0206031 B1 EP0206031 B1 EP 0206031B1 EP 86107645 A EP86107645 A EP 86107645A EP 86107645 A EP86107645 A EP 86107645A EP 0206031 B1 EP0206031 B1 EP 0206031B1
Authority
EP
European Patent Office
Prior art keywords
lining
quadrant
fabric
bowl
liner
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.)
Expired - Lifetime
Application number
EP86107645A
Other languages
German (de)
English (en)
Other versions
EP0206031A1 (fr
Inventor
J. Eugene Grisz
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.)
Baker Hughes Holdings LLC
Original Assignee
Baker Hughes Inc
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 Baker Hughes Inc filed Critical Baker Hughes Inc
Priority to AT86107645T priority Critical patent/ATE60648T1/de
Publication of EP0206031A1 publication Critical patent/EP0206031A1/fr
Application granted granted Critical
Publication of EP0206031B1 publication Critical patent/EP0206031B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relates to elastomeric linings for centrifugal pumps and particularly to rubber linings, especially natural rubber linings, which are constructed to prevent collapse during use.
  • Elastomeric linings including rubber linings, and in particular, natural rubber linings, have been used for quite some time in centrifugal pumps, both as liners and as coverings on impellers so that the pumps could effectively handle abrasive slurries and corrosive liquids such as acids.
  • the pump lining will collapse, that is, the rubber lining will pull away from the casing of the pump. If this happens in a region proximate to the impeller, the impeller may chew up the lining and render the pump disabled. Even if the lining pulls away from the casing in the discharge region or in the throat region without interfering with the impeller, the sagging lining may impede flow and make the pump less effectual.
  • a centrifugal pumps half-shell rubber lining is disclosed which is permanently secured to the casing and secondly is constructed by a multi-step curing process, e.g. the casing assembly is not curable in one step.
  • the instant invention relates to a half-shell lining for centrifugal pumps wherein the lining is made of a natural rubber and reinforced in selective regions with a resin impregnated fabric which permits the rubber to shrink its normal amount during curing.
  • the invention involves lining a mold with thermosetting resin impregnated fabric in those regions in which it is desired to reinforce a rubber lining made in said mold.
  • the impregnated fabric is placed several or more layers thick in the region to be reinforced.
  • the rubber and the thermoset impregnated fabric is cured for a time and at a temperature sufficient to bring about curing of the rubber and the resin.
  • the instant invention is particularly advantageous inasmuch as linings may be molded in molds already sized to accommodate for shrinkage of the elastomer material during molding so that the finished liner will fit within the intended pump casing.
  • the elastomer can be cured for substantially the same time and substantially the same temperature as it is usually cured so that a fully cured liner results.
  • the invention provides reinforcement at the desired location (i.e., at the outside surface of the liner) so that the liquid within the pump contacts only the erosion and corrosion resistant liner surface.
  • thermosetting resin impregnated mesh sheets are generally placed in the molds so that a substantially complete arch is formed as an exterior surface of the lining or at least as much as an arch as possible so that optimum resistance to collapse is obtained with a minimum thickness of fabric layers.
  • the instant invention comprises a soft elastomeric liner, particularly natural rubber liners, having unique reinforcement means in selective areas or regions of the liner. Also, the invention comprises a unique process for molding the reinforcing means and the rubber in a single process step in curing the rubber and reinforcing means at a similar temperature for the period of time.
  • Rubber or elastomeric liners are typically provided for centrifugal pumps which handle either erosive or corrosive media. These pumps are of a very large size having diameters from about 50 centimeters up to about 150 centimeters. Although smaller centrifugal pumps having diameters as small as 15 centimeters are also provided with liners, the ratio of the liner thickness to liner size is smaller in large pumps which have a greater tendency to collapse, especially if the liner is composed of soft natural rubber.
  • negative pressure below atmospheric pressure may occur in the pump, especially in the suction region, for the purposes of the description of this invention, negative pressure is intended to mean a pressure substantially below the usually high pressures within the pump since rapid changes in pressure (hydraulic head) within the pump may occasionally collapse the liner.
  • the instant invention provides reinforcement means in those regions of the liner which have been found to be most often subject to collapse and to provide such reinforcement means on the outer surface of the liner, that is, that surface of the liner which contacts the casing. Furthermore, the invention provides reinforcing means impregnated with a thermosetting resin which cures within the same temperature range as the natural rubber liner. Further description of the invention may be facilitated by reference to the attached drawings.
  • a half-shell elastomeric liner is illustrated in perspective view.
  • a half-shell liner is a large bowl-shaped structure with a central axial aperture.
  • Two half-shell liners are mated to form the lining protecting the entire inner casing of the centrifugal pump.
  • the liner 10 has curved peripheral sidewalls 11 and an integral flat plate-like interior 12 with an aperture 13 which either is a throat opening to admit fluid into the pump or an opening which permits the drive shaft to pass through to connect to the impeller. If the liner has an opening to admit the drive shaft, it is referred to as the engine-side liner while if the opening in the liner is to admit fluid, then it is referred to as the suction-side liner.
  • the portion of the liner in contact with the casing substantially forms the peripheral surface of a toroid.
  • a half-shell lining is illustrated in an elevational view with quadrants of the lining being designated A, B, C and D.
  • quadrants of the lining being designated A, B, C and D.
  • a liner is illustrated with fabric plys 17 and 18 exposed illustrating the mesh-like o nature of the fabric.
  • the reinforcement means 17 and 18 is further illustrated.
  • the reinforcement means 17 in the discharge region is substantially a semi-cylindrical structure substantially thinner in cross-sectional thickness than the lining and integral with the external surface of the lining.
  • the reinforcement means 17 is generally at least about three layers thick and may preferably be 10 to 30 layers thick.
  • the reinforcing means comprises an uncured thermosetting resin impregnated in a fine denier nylon mesh fabric.
  • Reinforcing means 18 comprises a similar number of plys of a similar material. Reinforcement means 18 forms about one-half of an arch.
  • the reinforcement means 18 extends completely around the lining substantially reinforcing all the quadrants A, B, C and D, as illustrated in Fig. 2. Full circle reinforcing of large diameter linings may be preferred for many applications.
  • the linings represented in Figs. 4 and 5 are two- piece linings, that is, two pieces are required to form a single half-shell lining.
  • Separate flat disk members such as member 12a shown in Fig. 4, join with the peripheral pieces illustrated in Figs. 4 and 5 to form the half-shell liner. Construction of the type shown in Figs. 4 and 5 without integral central disk members is frequently used in very large pumps.
  • the separate flat disk-like central members interlock with the peripheral members shown in Figs. 4 and 5 to hold the peripheral members in place.
  • the central disk-like members are usually provided with threaded studs which project through bolt-holes in the casing so that the lining may be securely fixed to the casing.
  • the reinforcement means in the form of multiple plys may be from about 2.5 millimeters to about 12.7 millimeters in thickness and preferably is from about 5.0 millimeters to about 10.2 millimeters in thickness, while the thickness of the rubber lining is about 19.0 millimeters to about 38.1 millimeters and is generally about 25.4 millimeters to 31.8 millimeters.
  • the half-shell is reinforced by placing within the mold used to form a half-shell lining, a layer of a plurality of thin sheets impregnated with an uncured thermosetting resin fabric mesh.
  • the regions of the mold in which the reinforcing is intended to be applied to the lining are completely covered with the fabric sheets.
  • the thickness of the impregnated fabric is generally not greater than about .5 millimeters and the fabric reinforcement is applied in the mold from about three to about thirty plys thick and generally about ten to thirty plys thick.
  • a particular material useful as reinforcement in this invention is a phenolic resin impregnated nylon fabric material which has curing conditions substantially similar to natural rubber and which shrinks about the same amount as natural rubber upon curing. It is identified in the art by MIL-P-15047. The rubber cures at a temperature of about 149°C (300°F) for about 3-1/2 hours.
  • a rubber liner prepared in this fashion has reinforcing means integrally molded in the rubber lining and being that the resin is a thermosetting and relatively rigid material, a strong arch-type support is provided in each region in which the lining is reinforced.

Landscapes

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

Claims (9)

1. Revêtement en un matériau élastomère renforcé, remplaçable, pour pompe centrifuge, ce revêtement étant à son état non durci ou non vulcanisé et convenant pour une vulcanisation en une seule étape dans un moule, ledit revêtement non durci ou non vulcanisé comprenant:
-une couche d'élastomère non vulcanisé, délimitant une région de volutes, une région centrale, une région d'entrée et une région de sortie ou de refoulement;
-un tissu imprégné d'une matière résineuse thermodurcissable, non durci, qui durcit sensiblement dans les mêmes conditions que ladite couche de matériau élastomère, ledit tissu ayant un facteur de rétrécissement, lors du durcissement, qui est sensiblement le même que le facteur de rétrécissement de ladite couche de matériau élastomère, ledit tissu étant lié par adhérence à ladite couche de matériau élastomère.
2. Revêtement en matériau élastomère selon la revendication 1, dans lequel ledit tissu est composé de nombreux plis d'une étoffe imprégnée de résine.
3. Revêtement selon la revendication 2, dans lequel un pli d'étoffe imprégnée de résine comprend un tissu lâche de filaments de "Nylon" imprégnés d'une résine phénolique.
4. Revêtement en matériau élastomère, en forme de cuvette, correspondant à une demi- coquille ou à un démi-corps, remplaçable, pour carter de pompe centrifuge, ledit revêtement comprenant une couche d'un matériau élastomère et une étoffe d'armature de renforcement, essentiellement rigide, analogue à du tissu imprégné d'une résine, l'étoffe étant montée sur ladite couche de matériau élastomère, ledit revêtement délimitant un trajet d'écoulement pour un fluide, ledit revêtement ayant une buse de décharge ou de refoulement en forme de cylindre fendu montée sur ledit revêtement en formé de cuvette, ledit revêtement en forme de cuvette étant divisé en quatre quadrants: un premier quadrant, un second quadrant, un troisième quadrant et un quatrième quadrant, ledit premier quadrant étant voisin dudit montage de ladite buse de refoulement sur ledit revêtement en cuvette, ledit second quadrant étant contigu audit premier quadrant, de sorte que du fluide se trouvant à l'intérieur de ce trajet d'écoulement du fluide travers ledit second quadrant immédiatement avant de passer par ledit premier quadrant, puis sort par la buse de décharge ou de refoulement, lesdites étoffes d'armature de renforcement, en forme de demi-cylindre, étant montées sur ladite buse de refoulement et sur ledit revêtement en forme de cuvette dans lesdits premier et second quadrants dudit revêtement en forme de cuvette, une épaisseur de section dudit revêtement étant constituée par ladite couche de matériau élastomère sauf dans les régions comportant des étoffes d'armature de renforcement fixées par adhérence à ce matériau, ladite épaisseur en section étant constituée dans lesdites régions par ladite couche de matériau élastomère et par lesdites étoffes d'armature de renforcement.
5. Revêtement selon la revendication 4, dans lequel ledit revêtement délimite une paroi latérale incurvée, lesdites étoffes d'armature étant montées sur ladite paroi latérale incurvée dudit revêtement en matériau élastomère.
6. Revêtement selon la revendication 4, dans lequel chacune des étoffes d'armature consiste en de nombreux plis dudit tissu imprégné de résine.
7. Revêtement selon la revendication 4, dans lequel ledit tissu d'armature forme sensiblement la surface extérieure dudit revêtement dans les régions dans lesquelles lesdites étoffes d'armature sont présentes.
8. Revêtement selon la revendication 4, dans lequel ladite étoffe est en "Nylon".
9. Revêtement selon la revendication 4, dans lequel ladite résine est une résine phénolique thermo-durcissable.
EP86107645A 1985-06-10 1986-06-05 Recouvrement en caoutchouc renforcé pour carter de pompe centrifuge Expired - Lifetime EP0206031B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86107645T ATE60648T1 (de) 1985-06-10 1986-06-05 Verstaerkte zentrifugalpumpengehaeusegummiauskleidung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74292885A 1985-06-10 1985-06-10
US742928 1985-06-10

Publications (2)

Publication Number Publication Date
EP0206031A1 EP0206031A1 (fr) 1986-12-30
EP0206031B1 true EP0206031B1 (fr) 1991-01-30

Family

ID=24986819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107645A Expired - Lifetime EP0206031B1 (fr) 1985-06-10 1986-06-05 Recouvrement en caoutchouc renforcé pour carter de pompe centrifuge

Country Status (10)

Country Link
EP (1) EP0206031B1 (fr)
JP (1) JPS61294189A (fr)
AT (1) ATE60648T1 (fr)
AU (1) AU602308B2 (fr)
BR (1) BR8602677A (fr)
CA (1) CA1267039A (fr)
DE (1) DE3677262D1 (fr)
FI (1) FI92860C (fr)
NO (1) NO169248C (fr)
ZA (1) ZA864326B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014143987A1 (fr) * 2013-03-15 2014-09-18 Weir Slurry Group, Inc. Corps de pompe avec revêtement intérieur précontraint
DE19959344B4 (de) * 1999-12-09 2016-05-12 Andreas Stihl Ag & Co. Radialgebläse mit einstückiger Verschleißeinlage

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2009905C (fr) * 1990-02-13 1994-08-30 Michael Langford Malkoski Pompe a mortier de haute densite
IT1394295B1 (it) 2009-05-08 2012-06-06 Nuovo Pignone Spa Girante centrifuga del tipo chiuso per turbomacchine, componente per tale girante, turbomacchina provvista di tale girante e metodo di realizzazione di tale girante
IT1397057B1 (it) 2009-11-23 2012-12-28 Nuovo Pignone Spa Girante centrifuga e turbomacchina
IT1397058B1 (it) 2009-11-23 2012-12-28 Nuovo Pignone Spa Stampo per girante centrifuga, inserti per stampo e metodo per costruire una girante centrifuga
DE102010026448A1 (de) * 2010-07-08 2012-01-12 Ksb Aktiengesellschaft Kreiselpumpe
ITCO20110064A1 (it) 2011-12-14 2013-06-15 Nuovo Pignone Spa Macchina rotante comprendente un rotore con una girante composita ed un albero metallico
DE102013225065B4 (de) 2013-12-06 2016-04-14 Ksb Aktiengesellschaft Pumpengehäuse in Kunststoffbauweise
ITCO20130067A1 (it) 2013-12-17 2015-06-18 Nuovo Pignone Srl Girante con elementi di protezione e compressore centrifugo

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094075A (en) * 1960-06-08 1963-06-18 Denver Equip Co Centrifugal pumps
US3450594A (en) * 1965-06-29 1969-06-17 Rubber Electronic Ind Laminated product and process for preparing same
US3607600A (en) * 1969-07-15 1971-09-21 Hauck Mfg Co Composite molding process and product
DE2100870A1 (de) * 1971-01-09 1972-07-13 Zimmermann & Jansen Gmbh Spiralgehäuse für eine Kreiselpumpe
GB1547610A (en) * 1975-05-09 1979-06-20 Skega Ab Wear liners for abrasive-material handling equipment
SE411571B (sv) * 1978-06-16 1980-01-14 Skega Ab Slitfoder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19959344B4 (de) * 1999-12-09 2016-05-12 Andreas Stihl Ag & Co. Radialgebläse mit einstückiger Verschleißeinlage
WO2014143987A1 (fr) * 2013-03-15 2014-09-18 Weir Slurry Group, Inc. Corps de pompe avec revêtement intérieur précontraint

Also Published As

Publication number Publication date
FI862379A0 (fi) 1986-06-04
BR8602677A (pt) 1987-02-03
ZA864326B (en) 1987-02-25
NO169248C (no) 1992-05-27
EP0206031A1 (fr) 1986-12-30
CA1267039A (fr) 1990-03-27
FI862379A (fi) 1986-12-11
FI92860C (fi) 1995-01-10
ATE60648T1 (de) 1991-02-15
FI92860B (fi) 1994-09-30
NO862305L (no) 1986-12-11
JPS61294189A (ja) 1986-12-24
NO862305D0 (no) 1986-06-09
NO169248B (no) 1992-02-17
AU602308B2 (en) 1990-10-11
DE3677262D1 (de) 1991-03-07
AU5851486A (en) 1986-12-18

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