EP1280999B1 - Pompe centrifuge submersible avec un dispositif de blocage pour bloquer le bloc stator - Google Patents

Pompe centrifuge submersible avec un dispositif de blocage pour bloquer le bloc stator Download PDF

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Publication number
EP1280999B1
EP1280999B1 EP01925772A EP01925772A EP1280999B1 EP 1280999 B1 EP1280999 B1 EP 1280999B1 EP 01925772 A EP01925772 A EP 01925772A EP 01925772 A EP01925772 A EP 01925772A EP 1280999 B1 EP1280999 B1 EP 1280999B1
Authority
EP
European Patent Office
Prior art keywords
shell
crown
pump
elastic ring
locking
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
EP01925772A
Other languages
German (de)
English (en)
Other versions
EP1280999A1 (fr
Inventor
Remo Carreri
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.)
Caprari SpA
Original Assignee
Caprari SpA
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Filing date
Publication date
Application filed by Caprari SpA filed Critical Caprari SpA
Publication of EP1280999A1 publication Critical patent/EP1280999A1/fr
Application granted granted Critical
Publication of EP1280999B1 publication Critical patent/EP1280999B1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/36—Retaining components in desired mutual position by a form fit connection, e.g. by interlocking

Definitions

  • the present invention relates to a locking device for locking the stator pack of submersible centrifugal pumps.
  • Said device is suitable for locking the pack of the diffusers preventing the pack from moving inside the cylindrical shell of the pump, particularly along an axial direction.
  • Italian patent IT 1005473 filed in the name of the same applicant, discloses a locking device comprising a pair of end crowns each of which is fixed inside the cylindrical shell, respectively upstream and downstream the stator pack, by means of an elastic ring having circular section and toroidal shape inserted into a corresponding groove obtained inside said shell.
  • Each crown is provided with threaded holes suitable for receiving respective screws passing through closing flanges arranged at opposite ends of the shell and centred thereon.
  • the crown arranged downstream the stator pack acts as an axial stop for the pack, while the crown arranged upstream the pack acts as a fastening element for the upper flange.
  • said device comprises a crown which is welded at an end of the pump shell and is not fixed to the shell by means of elastic ring.
  • a drawback of the devices of this type is that, when the flanges are fixed to the shell by means of the screws, the tightening torque has to be limited to a pre-established value for preventing the elastic ring from being extruded into the space existing between the crown and the shell so as to deform the groove and bend the shell, or even exiting from the groove.
  • the tightening torque of the screws must have a limited value for preventing dangerous ejection of the ring from the seat thereof in condition of maximum clearance.
  • a locking device comprising two rows of slots punched in the outer cylindrical shell of the pump on two planes parallel to each other and orthogonal to the axis of the pump, arranged respectively upstream and downstream the stator pack.
  • nibs may be introduced into the shell, said nibs being provided on nuts which are capable of engaging the threaded ends of tie rods arranged parallelly to the axis of the pump and passing through holes obtained in the closing flanges of the pump.
  • the above-mentioned nibs act as stops for the end diffusers of the stator pack so allowing said diffusers to be locked.
  • the pump may comprise a flange welded at one end thereof and a device analogous to the above-described device at the other end.
  • KSB's catalogue on pages 11-14 and 33-36
  • LEBA's catalogue on pages 1-14
  • HYDROPOMPE WS's catalogue on page 11).
  • a drawback of such devices consists in that punching or shearing the slots on the external shell produces out-of-round deformations of the shell which makes it difficult to introduce the pack into the shell and requires onerous operations of adjustment.
  • the tightening stress is not uniformly distributed on the circumferential edge of the shell, but is concentrated in regions from which cracks and corrosion under fatigue start.
  • a locking device comprising a pair of flanges, each arranged at one of the ends of the shell, which protrude from said shell and are provided with holes arranged externally with respect to the diameter of the shell and suitable for allowing tie rods to be housed. On the threaded ends of such tie rods nuts are engaged which tighten the shell, and consequently the stator pack, between the flanges of the pump.
  • a variation consists in the absence of an external metallic shell and the use of diffusers each provided with its own shell.
  • KSB's catalogue on pages 23-26
  • EBARA's catalogue on papes 1-15
  • ITT-LOWARA's catalogue of Z612/Z616/Z622/Z631/Z646/Z660 Series on pages 1-54.
  • Devices of this type are very bulky and considerably increase the radial overall dimensions due to the presence of the tie rods, which are sized according to the maximum pressure exerted by the pump during working.
  • devices of this type are uneconomic since, when a single external metallic shell is used, the shell carries out only a function of containment of the diffusers and it is necessary to further provide a plurality of axial tie rods arranged for bearing axial compression of said diffusers.
  • a locking device comprising a pair of flanges threaded on their external diameter and each arranged at one of the ends of the shell. The threads of said flanges engage a respective threaded section obtained on the internal surface of the shell. The stator pack of the diffusers is locked by screwing to the shell the two treaded flanges.
  • the shell comprises a
  • first flange welded at one end thereof and suitable for acting as a stop for the first diffuser of the pack and a second threaded flange screwed at the other end.
  • first flange welded at one end thereof and suitable for acting as a stop for the first diffuser of the pack and a second threaded flange screwed at the other end.
  • second threaded flange screwed at the other end.
  • pumps provided with such devices are difficult to be disassembled due to the presence of encrusting material, such as sludge or slime, which may accumulate at the threaded coupling.
  • US 4171934 discloses a submergible electric pump comprising a discharge head provided with a locking device for locking the discharge head to a well liner, the device comprising a plurality of lugs projected into a groove in the well liner when the pump is lowered through the liner to an operative position, at which, the discharge head is sealed in the liner.
  • the discharge head has inner and outer tubular members, the outer member seating on the liner and being held against rotation relative to the liner.
  • the inner member continues to move downwardly after the outer member is seated, camming the locking lugs outwardly through windows in the outer member and into the liner groove.
  • the lugs provide support for the weight of the pump installation and prevent rotation between the inner and outer members of the discharge head.
  • EP 0610826 discloses a centrifugal pump of the type comprising a supporting body (10) for a permanent-magnet synchronous motor with an impeller (49) coupled to its rotor (22), and for a volute (48) in which the impeller is accommodated.
  • the body (10) and the volute (48) form a sealed housing containing the rotor and the impeller in respective chambers, separating them from the stator part of the motor.
  • the rotor (22) is rigidly coupled to a shaft (24) rotating on sliding bearings (26, 29) supported by elastic supports locked in the corresponding chamber, one of which supports forms a ring for providing hydraulic sealing between the two chambers of the container.
  • US 4445820 discloses an electrically powered pump, in which the armature of the motor is rotatably fitted through the bearings provided at both ends of its rotary shaft.
  • a rotor is rotatably mounted through a fixed shaft arranged differently from the rotary shaft to form a pump means, the rotary shaft and the rotor being connected by a connector means in such a manner that the radial displacement of both axes of the rotary shaft and the rotor can be absorbed by the connector.
  • two stages of impellers are rotatably mounted to the fixed shaft arranged in axially alignment with the rotary shaft to form a pump means. The rotary shaft and the impellers are connected by a connector means in such a manner that the relative motion in a circumferential direction of the rotary shaft and the impellers is restricted.
  • An object of the present invention is to improve the known locking devices.
  • Another object of the present invention is to provide a device for locking the stator pack of a pump comprising an elastic ring which is easy to be inserted into and extracted from a respective seat.
  • a further object of the invention is to provide a locking device comprising an elastic ring which is substantially free from deformations during working, so that the risk of an ejection of the ring from the groove in which it is housed is reduced.
  • a submersible centrifugal pump is provide as defined in claim 1.
  • said elastic ring means comprises tooth means suitable for engaging respective groove means obtained in said shell means.
  • said friction surface is a conical surface.
  • the ring means is broken in a section of the peripheral edge thereof, which allows a limited circumferential deformation, however sufficient to allow the tooth means to firmly engage the groove means obtained in the shell.
  • said flange means is associated with support means provided with a support step which engages the first of the diffusers of the pack of the pump. Therefore, when the screws are tightened, the flange means presses the support means which locks the stator pack of the pump so preventing any movement thereof.
  • a pump 1 comprising an external shell 2 consisting of a steel tubular element into which a crown 3 is housed.
  • an elastic ring 4 is arranged comprising a protruding portion 5 arranged for being housed into a groove 6 obtained in the shell 2.
  • the elastic ring 4 comprises a conical surface section 7 suitable for being coupled with a respective conjugate surface 7a of the crown 3.
  • the pump 1 further comprises a closing flange 8 suitable for closing the shell 2 which is fixed to the crown 3 by means of screws 9 engaging threaded holes obtained in the above-mentioned crown 3.
  • an inclined cut 15 breaking the circumference of the ring 4 is shown; the above-mentioned cut 15 allows the ring 4 to be the quickly removed using a standard flat-end screwdriver when the pump 1 is disassembled.
  • the cut 15 allows the ring 4 to deform so as to allow the protruding portion 5 to be housed into the groove 6.
  • the ring 4 Since during working the ring 4 does not lock the crown 3 owing to an elastic deformation, but rather locks the crown 3 by substantially acting as a body rigidly fixed to the shell 2, advantageously the ring 4 is made of steel for a better stress strength.
  • impellers 10 keyed onto the shaft 11 and fixed thereto through a further screw 16, and the diffusers 12 are further arranged internally to the shell 2.
  • the flange 8 comprising the valve body of the pump 1 abuts on a support 13 provided with a step 14 which engages the first diffuser 12 so locking said diffuser 12 and the whole stator pack of the pump 1 and, therefore, preventing the stator pack from sliding in an axial direction.
  • the pump 1 is provided, in the not-shown portion arranged downstream the stator pack, with a further crown, provided with a further ring similar to the above-described ring, said crown acting as a supporting and stopping element for the stator pack.
  • the crown arranged downstream the stator pack is not fixed to the shell by means of an elastic ring, but is directly welded to said shell.
  • the pump is assembled in the way described hereinafter.
  • the impellers 10 and the diffusers 12, alternated in a suitable sequence, are inserted on the shaft 11 abutting, at the bottom, on the driving joint of the shaft 11, not shown, and being tightened, at the top, with the screw 16 which engages a threaded hole obtained in the upper end of the shaft 11.
  • the pack so assembled is then inserted into the shell 2 until it abuts on the lower crown, not shown, fixed to the shell by elastic ring 4, or by welding.
  • the sub-group of the support 13 is inserted into the shell 2 and then the crown 3 is introduced and pushed until it contacts the shoulder of the support 13 for allowing the groove 6 obtained in the shell 2 to become accessible. Then the elastic ring 4 is inserted into the shell 2 until the protruding portion 5 thereof engages the groove 6 obtained in the shell 2.
  • the flange 8 comprising the stop valve, is placed on the upper end of the shell 2, so that the holes present on the flange 8 are properly aligned with the threaded holes present on the crown 3 previously inserted into the shell 2.
  • the flange 8 does not reach the shoulder on the upper edge of the shell 2: in this case the axial load on the pack is obtained tightening the screws 9 until the pre-established tightening torque is reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Frames (AREA)
  • Lock And Its Accessories (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Claims (6)

  1. Pompe centrifuge submersible (1), pourvue d'un dispositif de blocage pour bloquer le bloc stator de ladite pompe (1), comprenant des moyens de corps (2) aptes à contenir des étages de pompage pour le pompage d'un fluide, des moyens de couronne (3) pourvus de moyens de raccord et de fixation (9), agencés de manière à raccorder des moyens de bride (8) de ladite pompe (1) auxdits moyens de couronne (3), lesdits moyens de bride (8) étant aptes à fermer hermétiquement lesdits moyens de corps (2), des moyens de bague élastique (4) placés entre lesdits moyens de corps (2) et lesdits moyens de couronne (3), aptes à empêcher lesdits moyens de couronne (3) de glisser dans une direction axiale à l'intérieur desdits moyens de corps (2), caractérisée en ce que lesdits moyens de bague élastique (4) comprennent des moyens de cale pourvus d'une surface de frottement (7) apte à être couplée avec une surface conjuguée respective (7a) desdits moyens de couronne (3).
  2. Pompe selon la revendication 1, dans laquelle ladite surface de frottement est une surface conique (7).
  3. Pompe selon la revendication 1 ou 2, dans laquelle lesdits moyens de bague élastique (4) comprennent des moyens de dent (5) aptes à engager des moyens de rainure respectifs (6) ménagés dans lesdits moyens de corps (2).
  4. Pompe selon la revendication 3, dans laquelle lesdits moyens de bague élastique (4) comprennent une découpe (15) dans une section d'un rebord périphérique de ceux-ci, aptes à permettre auxdits moyens de bague élastique (4) de se déformer dans une direction circonférentielle pour permettre auxdits moyens de dent (5) d'engager lesdits moyens de rainure (6).
  5. Pompe selon l'une quelconque des revendications précédentes, dans laquelle lesdits moyens de bague élastique (4) sont faits d'acier.
  6. Pompe selon l'une quelconque des revendications précédentes, dans laquelle lesdits moyens de bride (8) sont associés à des moyens de support (13) aptes à engager un diffuseur (12) d'extrémité dudit bloc stator pour empêcher ledit bloc stator de se déplacer dans une direction axiale à l'intérieur dudit corps (2).
EP01925772A 2000-05-02 2001-04-30 Pompe centrifuge submersible avec un dispositif de blocage pour bloquer le bloc stator Expired - Lifetime EP1280999B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMO200008 2000-05-02
IT2000MO000088A IT1314627B1 (it) 2000-05-02 2000-05-02 Dispositivo di bloccaggio del pacco statorico di elettropompe
PCT/IB2001/000716 WO2001083996A1 (fr) 2000-05-02 2001-04-30 Dispositif de blocage pour bloquer le bloc stator de motopompes

Publications (2)

Publication Number Publication Date
EP1280999A1 EP1280999A1 (fr) 2003-02-05
EP1280999B1 true EP1280999B1 (fr) 2009-11-25

Family

ID=11450454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01925772A Expired - Lifetime EP1280999B1 (fr) 2000-05-02 2001-04-30 Pompe centrifuge submersible avec un dispositif de blocage pour bloquer le bloc stator

Country Status (7)

Country Link
EP (1) EP1280999B1 (fr)
CN (1) CN1177148C (fr)
AT (1) ATE449914T1 (fr)
AU (1) AU2001252453A1 (fr)
DE (1) DE60140607D1 (fr)
IT (1) IT1314627B1 (fr)
WO (1) WO2001083996A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20030225A1 (it) * 2003-07-31 2005-02-01 Caprari Spa Dispositivo di bloccaggio del pacco statorico di pompe.
ITBO20080219A1 (it) * 2008-04-09 2009-10-10 Pedrollo Spa Elettropompa centrifuga
IT1398808B1 (it) * 2010-03-17 2013-03-18 Calpeda A Spa Gruppo motore perfezionato per dispositivi di pompaggio
IT1399011B1 (it) * 2010-03-17 2013-03-28 Calpeda A Spa Dispositivo di compressione del gruppo statorico di una pompa
EP2818722B1 (fr) * 2013-06-24 2019-01-09 Grundfos Holding A/S Pompe centrifuge
RU2632741C2 (ru) * 2016-03-28 2017-10-09 Общество С Ограниченной Ответственностью "Вниибт-Буровой Инструмент" Устройство подачи затворной жидкости к двойному торцовому уплотнению мультифазной насосной установки
DE102020133327B4 (de) * 2020-12-14 2023-01-19 KSB SE & Co. KGaA Pumpenanordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171934A (en) 1978-05-08 1979-10-23 Trw Inc. Cable-suspended, liner-supported submergible pump installation with locking discharge head
US4445820A (en) 1980-12-27 1984-05-01 Aisan Kogyo Kabushiki Kaisha Electrically powered pump
IT1263644B (it) 1993-02-12 1996-08-27 Askoll Spa Pompa centrifuga perfezionata

Also Published As

Publication number Publication date
WO2001083996A1 (fr) 2001-11-08
ITMO20000088A0 (it) 2000-05-02
CN1177148C (zh) 2004-11-24
ATE449914T1 (de) 2009-12-15
AU2001252453A1 (en) 2001-11-12
DE60140607D1 (de) 2010-01-07
ITMO20000088A1 (it) 2001-11-02
EP1280999A1 (fr) 2003-02-05
IT1314627B1 (it) 2002-12-20
CN1427923A (zh) 2003-07-02

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