EP0907029B1 - Ensemble de pompe centrifuge - Google Patents

Ensemble de pompe centrifuge Download PDF

Info

Publication number
EP0907029B1
EP0907029B1 EP98118524A EP98118524A EP0907029B1 EP 0907029 B1 EP0907029 B1 EP 0907029B1 EP 98118524 A EP98118524 A EP 98118524A EP 98118524 A EP98118524 A EP 98118524A EP 0907029 B1 EP0907029 B1 EP 0907029B1
Authority
EP
European Patent Office
Prior art keywords
flange
centrifugal pump
pump unit
retaining ring
unit according
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
EP98118524A
Other languages
German (de)
English (en)
Other versions
EP0907029A2 (fr
EP0907029A3 (fr
Inventor
Niels Due Jensen
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.)
Grundfos AS
Original Assignee
Grundfos AS
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 Grundfos AS filed Critical Grundfos AS
Publication of EP0907029A2 publication Critical patent/EP0907029A2/fr
Publication of EP0907029A3 publication Critical patent/EP0907029A3/fr
Application granted granted Critical
Publication of EP0907029B1 publication Critical patent/EP0907029B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid 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
    • F04D29/4293—Details of fluid inlet or outlet

Definitions

  • the invention relates to a centrifugal pump unit with the features specified in the preamble of claim 1.
  • Flange connections have become established when connecting pipes. These connections are particularly suitable for pipes of medium and large cross-section as well as for medium and high pressure loads. Such a flange connection mechanically connects two abutting tubes and seals them via a seal pressed in between the flanges.
  • the flanges or flanged pipe sections are usually connected to a pipe by welding on site, so that both the adaptation to the type of flange used and the alignment of the flange bores of a common flange connection are generally not a problem.
  • the alignment of the perforated flanges can usually be done on the pipeline side.
  • greater problems arise when the flange on the pump side does not match the flange on the pipeline side, for example because flanges of different standards are used.
  • the pump-side flange is generally not changeable, so that usually the entire pump, but at least the pump housing or the pump base, on which the flanges are usually integrally formed, must be replaced.
  • the invention is based on the object of designing a centrifugal pump unit which has at least one such connection flange in such a way that it can be adapted to different flange standards with little production outlay and at low storage costs.
  • the flange connection is thus separated into two functionally different modules, namely a sealing flange and a mounting flange, the sealing flange being firmly connected to the pump unit and the mounting flange being positively but releasably connected to the sealing flange via a retaining ring.
  • Different fastening flanges can thus be provided on the same centrifugal pump unit without making structural changes, but only by replacing this fastening flange.
  • the sealing flange and mounting flange are positively connected to each other by a one-piece retaining ring, which is incorporated in a circumferential recess between the sealing flange and mounting flange, the high forces to be absorbed by the mounting flange can be safely transmitted to the sealing flange, so as to achieve the required surface pressure in the area of the sealing surfaces sure.
  • it can be ensured by the one-piece retaining ring that the fastening flange pushed over the sealing flange does not accidentally come loose or that the retaining ring attached to the sealing flange is lost.
  • the division of the sealing flange and mounting flange offers the particular advantages, particularly in the case of a centrifugal pump unit, that the sealing flange and mounting flange can be made of different materials and that a build-up of material, as is the case with one-piece connecting flanges in this area, is avoided.
  • the former is advantageous, for example, when it comes to special pumps which have to be made of highly corrosion-resistant materials or coated materials, since comparatively inexpensive cast iron fastening flanges can also be used for these applications.
  • centrifugal pump units of the type mentioned at the outset have two connecting pieces, namely a pressure port and a suction port, in which case each of these ports is preferably provided as a flange connection, consisting of a sealing flange which is firmly connected to the pump housing and a fastening flange which is positively fastened thereon by means of a retaining ring.
  • the arrangement according to the invention also has the advantage that the mounting flange can be rotated with respect to the sealing flange, that is to say the fixed pump housing, so that the pump unit can be connected to existing flange connections in any position without problems, since the flange bores are aligned Turning the mounting flange on the sealing flange can be achieved.
  • the retaining ring which should not normally be closed so that the mounting flange can be easily dismantled, will have a rectangular cross-section if particularly high forces are to be transmitted, since problems with the permissible surface pressure could arise with other cross-sectional shapes.
  • the fastening flange is to be held in a latching position on the sealing flange
  • the retaining ring is expedient to design the retaining ring as a spring ring, with a preferably circular or oval cross-sectional contour.
  • the retaining ring should extend in an untensioned state over a circular arc in the range between 330 ° and 350 °, in order on the one hand to give a form-fitting hold between the fastening flange and the sealing flange over the entire circumference, on the other hand to be mountable or demountable.
  • the recess in the inner circumference of the fastening flange is preferably formed by a step in this area in such a way that the Fastening flange can be moved towards the pump towards the sealing flange and has a contour adapted to the retaining ring in the opposite direction exactly in the area of this gradation.
  • the dimensions between the sealing flange, retaining ring and fastening flange are preferably selected so that the retaining ring designed as a spring ring has an inner diameter which, when unclamped, is smaller than the outer diameter of the sealing flange, but larger than the diameter of the sealing flange at the base of the recess. This dimensioning ensures that, on the one hand, the retaining ring is held in a form-fitting manner within the recess on the sealing flange side, but on the other hand is still compressible in this position. This spring travel can then be used to hold the mounting flange in place on the sealing flange.
  • a circumferential nose can be provided in the area in front of the step on the inner circumference of the fastening flange, the inner circumference of which is larger than the outer circumference of the retaining ring designed as a spring ring in the unstressed state or when it is seated on the sealing flange. If necessary, this holding effect can also be guaranteed exclusively by the clamping force of the holding ring.
  • a mounting flange according to the invention can be produced inexpensively as a cast part, with machining generally on the inner circumference will be necessary, possibly also in the area of the screw head supports.
  • the centrifugal pump unit shown in FIG. 1 is a three-stage inline centrifugal pump consisting essentially of a pump base 1, pump stages 2, a clutch 3 and an adjoining motor (not shown). Pump units of this type are well known, in this context reference is only made to high-pressure centrifugal pumps of the CR series from Grundfos, Denmark, by way of example.
  • the pump unit shown has in the pump foot 1 transversely to the impeller axis 4 connecting pieces 5, 6 in the form of connecting flanges.
  • 5 is the suction port and 6 the pressure port.
  • Both connecting pieces 5, 6 are formed like the connecting flange 5 shown enlarged in FIG. 2.
  • Such a connecting flange which closes a tubular housing part 7, consists of a sealing flange 8, a fastening flange 9 and a retaining ring 10.
  • the sealing flange 8 which connects approximately flush with the tubular housing part 7 and is formed in one piece with the pump base made of cast iron in its outer end face an annular flat sealing surface 11, as is common with other flanges.
  • the outer periphery of the sealing flange 8 is designed as a cylindrical surface and has a circumferential groove 12 which is semicircular in cross section at half the length.
  • the groove 12 is part of a circumferential recess 13 formed between the sealing flange 8 and the fastening flange 9, in which the retaining ring 10 is incorporated.
  • the mounting flange 9 is designed as a substantially cylindrical ring and has a number of evenly distributed bores 14 through which screws can be guided in a manner known per se, which are supported on the sides of the connecting flanges which are to be fastened or fastened to one another ,
  • the mounting flange 9 is cylindrical on its inside, the inside diameter in this area corresponding at least to the outside diameter D3 of the sealing flange 8.
  • the part of the recess 13 on the sealing flange side is designed as a gradation 15 and there is correspondingly adapted to the cross-sectional contour of the retaining ring 10.
  • the retaining ring 10 is designed as a spring ring and extends over a circular arc of 340 ° in the untensioned state.
  • the retaining ring 10 is designed such that its inner diameter D1 is smaller than the outer diameter D2 of the sealing flange 8, but larger than the diameter D3 at the bottom of the groove 12.
  • the retaining ring 10 must therefore first be spread against its internal stress for mounting on the outer circumference of the sealing flange 8 and be guided up to the level of the groove 12. After relaxation, the ring 10 dips into the groove 12, but not to the bottom of the groove, but at a short distance from it, so that it can still deflect in the direction of the bottom of the groove 12, but on the other hand already in a form-fitting manner in the groove 12 is held.
  • the fastening flange 9 which was previously slipped over the sealing flange 8 and loosely seated in the region of the tubular housing part 7, is then displaced in the direction 16 into its intended position, shown in FIG. 2, the retaining ring 10 is compressed against its internal stress, since the diameter D4 of the mounting flange 8 in the area of the gradation 15 is slightly smaller than the diameter D5 of the retaining ring 10 is in an untensioned state.
  • the fastening flange 9 is then held in the intended position shown in FIG. 2 by the spring force of the retaining ring 10.
  • a circumferential nose can be provided within the gradation 15, beyond the retaining ring 10, the inside diameter of which is smaller than the inside diameter D4 of the rest of the gradation, but is dimensioned such that it slides in the direction 16 when the fastening flange 9 is pushed on slides over the retaining ring 10.
  • the fastening flange 9 is held on the sealing flange 8 in a latching manner or only non-positively, but it is rotatably arranged with respect to the sealing flange 8.
  • the holes 14 can be made to overlap with the corresponding holes of the counter flange in a simple manner without having to change the position of the pump unit.
  • the mounting flange 9 against another, e.g. B. to be exchanged for a mounting flange with a different number of bores 14, the mounting flange 9 must first be moved against the direction 16 while overcoming the spring force of the retaining ring 10 on the tubular housing part 7, after which the retaining ring after spreading in the direction 16 and subsequently the mounting flange 9 can also be removed. The new mounting flange is then installed in the reverse order.

Landscapes

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

Claims (10)

  1. Ensemble de pompe centrifuge avec au moins un étage de pompe (2), avec un moteur d'entraînement, avec au moins un raccord d'aspiration (5) et avec au moins un raccord de refoulement (6), au moins un raccord étant réalisé en tant qu'embout de raccord sous la forme d'un flasque de raccord,
    caractérisé en ce que le flasque de raccord (5, 6) comprend un flasque d'étanchéité (8) avec une surface d'étanchéité (11) côté frontal, et, entourant celui-ci, un flasque de fixation (9) en une partie pour la mise place de moyens de fixation, et en ce que le flasque d'étanchéité (8) et le flasque de fixation (9) sont reliés l'un à l'autre par complémentarité de forme, au moyen d'une bague d'arrêt (10) en une seule partie, qui est incorporée dans un évidement circonférentiel (13) entre le flasque d'étanchéité (8) et le flasque de fixation (9).
  2. Ensemble de pompe centrifuge selon la revendication 1, caractérisé en ce que sur le carter de pompe sont prévus de manière alignée l'un sur l'autre, un embout de refoulement (6) et un embout d'aspiration (5), qui comportent chacun un flasque d'étanchéité (8) et un flasque de fixation (9) qui sont reliés l'un à l'autre par complémentarité de forme, au moyen de bagues d'arrêt (10).
  3. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que la bague d'arrêt (10) et l'évidement (13) présentent une section transversale sensiblement de forme circulaire.
  4. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que la bague d'arrêt (10) et l'évidement (13) présentent une section transversale sensiblement de forme rectangulaire.
  5. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que la partie de l'évidement (13), côté flasque d'étanchéité, est formée par une rainure (12) circonférentielle prévue du côté de la périphérie extérieure et dont la surface de section transversale correspond environ à la moitié de la surface de section transversale de la bague d'arrêt (10).
  6. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que le flasque de fixation (9) est réalisé avec un étagement sur sa périphérie intérieure, la zone étagée (15) étant adaptée au contour de la section transversale de la bague d'arrêt (10).
  7. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que la bague d'arrêt (10) est une bague élastique ou bague de ressort dont le diamètre intérieur (D1), dans l'état non serré ou non tendu, est inférieur au diamètre extérieur (D2) du flasque d'étanchéité (8) et supérieur au diamètre (D3) du flasque d'étanchéité (8) au niveau du fond de la rainure (12).
  8. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que la bague élastique (10) s'étend, à l'état non serré ou non tendu, le long d'un arc de cercle sur une plage de 330° à 350°.
  9. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que le flasque de fixation (9) est une pièce moulée en fonte.
  10. Ensemble de pompe centrifuge selon l'une des revendications précédentes, caractérisé en ce que le flasque de fixation (9) peut être fixé par enclenchement sur le flasque d'étanchéité (8).
EP98118524A 1997-10-04 1998-09-30 Ensemble de pompe centrifuge Expired - Lifetime EP0907029B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19743833A DE19743833A1 (de) 1997-10-04 1997-10-04 Kreiselpumpenaggregat
DE19743833 1997-10-04

Publications (3)

Publication Number Publication Date
EP0907029A2 EP0907029A2 (fr) 1999-04-07
EP0907029A3 EP0907029A3 (fr) 1999-10-13
EP0907029B1 true EP0907029B1 (fr) 2003-09-10

Family

ID=7844555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118524A Expired - Lifetime EP0907029B1 (fr) 1997-10-04 1998-09-30 Ensemble de pompe centrifuge

Country Status (2)

Country Link
EP (1) EP0907029B1 (fr)
DE (2) DE19743833A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20050240A1 (it) * 2005-07-29 2007-01-30 Dab Pumps Spa Struttura di pompa idraulica
EP2112380A1 (fr) * 2008-04-21 2009-10-28 DP Industries B.V. Pompe centrifuge en plusieurs étages en construction en ligne
IT201600072971A1 (it) * 2016-07-13 2018-01-13 Calpeda A Spa Pompa provvista di flange perfezionate
CN109751266A (zh) * 2018-12-10 2019-05-14 贵州电网有限责任公司 一种变电站用火电机组脱硫系统氧化风机
CN110469732A (zh) * 2019-09-12 2019-11-19 德帕姆(杭州)泵业科技有限公司 速拆型螺旋顶杆式泵阀安装结构
CN113217468A (zh) * 2021-06-23 2021-08-06 山东泰星新材料股份有限公司 一种离心泵的进出口连接结构及使用方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812959A (en) * 1953-08-21 1957-11-12 Westinghouse Air Brake Co Flange union fitting with gland expandible into an opening
US2911239A (en) 1959-05-18 1959-11-03 Sr George B Marzolf Multiple piece pipe flange
DE1650116B1 (de) * 1966-05-24 1970-09-03 Mannesmann Ag Flanschverbindung fuer Druckrohrleitungen
US3895883A (en) 1973-10-29 1975-07-22 James Miller Pedersen Propeller pitch indicator
FI53274A (fr) * 1974-02-22 1975-08-23 Goeran Sundholm
DE3729673A1 (de) * 1987-09-04 1989-03-23 Grundfos Int Mehrstufige kreiselpumpe
US5509699A (en) * 1994-06-06 1996-04-23 Certainteed Corporation Mechanical joint pipe adapter with inserted flexible spline

Also Published As

Publication number Publication date
EP0907029A2 (fr) 1999-04-07
DE19743833A1 (de) 1999-04-15
DE59809550D1 (de) 2003-10-16
EP0907029A3 (fr) 1999-10-13

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