EP2746586A1 - Zentrifugalpumpe mit Vorrichtung zur Verriegelung der Welle - Google Patents

Zentrifugalpumpe mit Vorrichtung zur Verriegelung der Welle Download PDF

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Publication number
EP2746586A1
EP2746586A1 EP12198370.4A EP12198370A EP2746586A1 EP 2746586 A1 EP2746586 A1 EP 2746586A1 EP 12198370 A EP12198370 A EP 12198370A EP 2746586 A1 EP2746586 A1 EP 2746586A1
Authority
EP
European Patent Office
Prior art keywords
shaft
centrifugal pump
recited
hole
fastening means
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.)
Withdrawn
Application number
EP12198370.4A
Other languages
English (en)
French (fr)
Inventor
Hannu Makkonen
Janne Ripattila
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.)
Sulzer Pumpen AG
Original Assignee
Sulzer Pumpen AG
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 Sulzer Pumpen AG filed Critical Sulzer Pumpen AG
Priority to EP12198370.4A priority Critical patent/EP2746586A1/de
Publication of EP2746586A1 publication Critical patent/EP2746586A1/de
Withdrawn legal-status Critical Current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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • 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
    • F04D29/20—Mounting rotors on shafts
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts

Definitions

  • the present invention relates to a centrifugal pump.
  • the present invention relates especially to a centrifugal pump - drive motor combination, the structure of which is simplified by arranging the impeller of the centrifugal pump to be supported by the bearings of the electric drive motor.
  • Such a pump is generally called a Close Coupled centrifugal pump.
  • Close Coupled centrifugal pumps do not, as already mentioned above, have separate bearings for the shaft of the impeller, but the bearings of the electric motor carry all the loads subjected to the shaft, i.e. both radial and axial forces as well as the weight of the impeller and the shaft end hanging outside the housing or bearings of the electric motor.
  • the shaft of the electric motor may extend to such a length that the centrifugal impeller is fastened directly to the end of the shaft of the electric drive motor or the electric drive motor may be a standard one having a substantially short shaft extending out of the motor housing.
  • the shaft of the impeller or, in fact, of the centrifugal pump is arranged as an extension of the shaft of the electric motor with an ordinary connection, for instance a key-sleeve connection to the end of the shaft of the electric motor.
  • a problem relating to the close coupled centrifugal pumps relates to the installation or dismantling of the impeller.
  • the shaft of the pump and that of the electric motor tend to rotate.
  • the electric motors are not provided with any means for that purpose.
  • the end of the motor opposite to the freely hanging shaft end is closed such that the end of the shaft is not even visible.
  • the fan cooling the electric motor is normally attached to the end of the shaft, whereby the fan should be dismantled to get access to the shaft.
  • the shaft is the only visible component.
  • an object of the present invention is to develop a new type of a centrifugal pump capable of solving the above discussed problem.
  • Another object of the invention is to develop such a novel fastening means or centrifugal pump casing or adapter for combining the centrifugal pump to the electric drive motor that includes means for preventing the shaft of the centrifugal pump and that of the motor from rotating when installing or dismantling the impeller of the centrifugal pump at the end of the shaft.
  • a centrifugal pump having a shaft, an impeller on the shaft and a volute casing housing the impeller, the volute casing being attached by fastening means to an electric drive motor having a shaft, the shaft of the electric motor supporting the impeller of the centrifugal pump, where the fastening means and the shaft are provided with means for preventing the rotation of the shaft.
  • FIG. 1 is a general partial cross sectional illustration of a close coupled centrifugal pump 10 in accordance with a first preferred embodiment of the present invention.
  • the close coupled centrifugal pump 10 shown in Fig. 1 comprises an electric drive motor 12 with an attachment flange 14 attached or arranged or integrated to its housing and a centrifugal pump volute casing (not shown) attached to the flange 14 of the drive motor 12 by fastening means 16.
  • the fastening means may be formed of the pump casing or be an adapter part separately attached thereto.
  • the fastening means 16 surrounds a shaft 18 of the electric motor 12, which extends to such a length that the shaft 18 of the electric motor 12 acts as the shaft of the centrifugal pump, too.
  • the impeller 20 of the centrifugal pump is attached to the end of the shaft 18. Naturally, the impeller 20 is located within the volute casing (not shown in the drawings) attached to the fastening means 16.
  • the problem leading to the present invention i.e. for preventing the shaft 18 of both the electric motor 12 and the centrifugal pump from rotating when installing or dismantling the impeller, or, in fact, when tightening or loosening the nut at the end of the shaft 18, is solved by arranging means for preventing the rotation of the shaft 18 in connection with both the shaft 18 and the fastening means 16.
  • the rotation preventing means comprises a hole 22 in the fastening means 16, a rotation stopper 24 in connection with the shaft 18, and a locking pin 26 insertable in the hole 22 and cooperating or communicating, when desired, with the rotation stopper 24.
  • the hole 22 in the fastening means 16 is preferably, but not necessarily, substantially radial. However, it is also possible to arrange the hole 22 to be somewhat inclined, as long as the hole 22 in the fastening means 16 is aligned with the rotation stopper 24 such that in at least one rotational position of the shaft 18 the locking pin 26 may be pushed to cooperate with the rotation stopper 24.
  • the inclination of the hole 22 may be arranged in both radial and axial direction, if desired.
  • the rotation stopper 24 in the shaft 18 is preferably a blind hole, though also a through-bore may be applied.
  • the diameter/s of the holes correspond/s to the diameter/s of the locking pin such that there is a sliding clearance between the holes and the pin 26.
  • a rotation stopper 24 in connection with the shaft 18 may be replaced with a series of rotation stoppers arranged on the circumference of the shaft 18.
  • the rotation stopper/s 24 may not only be formed of hole/s but it/they may as well be one or more axially extending grooves on the circumference of the shaft, or one or more axially extending radial protrusions, here called as tooth/teeth, arranged on the circumference of the shaft 18.
  • a further advantageous, but not necessary, feature of the locking pin 26 is that it is provided with means for locking the pin 26 in its axial direction into two positions, one for locking the shaft immobile, and another for locking the pin in its non-operative position i.e. the radially inner end of the pin 26 at a distance from the rotation stopper/s 24 in or on the shaft 18.
  • Such means may, for instance, be a spring loaded ball or pin arranged in connection with the hole 22 in the fastening means 16, and two circumferential grooves on the pin surface.
  • the locking means functions such that the spring pushes the ball or pin radially against the locking pin 26, and when the ball or pin hits the groove, the locking pin requires some force to move out of this locked position.
  • a first groove is positioned such that when the ball is positioned in the groove, the locking pin 26 extends into communication with the rotation stopper 24 preventing the shaft 18 from rotating.
  • the second groove is positioned closer to the end of the locking pin 26 used for locking the rotation of the shaft 18 such that when the ball is in the second groove the locking pin 26 does not any more extend into communication with the rotation stopper 24, but allows the shaft to rotate freely.
  • FIG. 2 illustrates a partial cross sectional view of a close coupled centrifugal pump in accordance with a second preferred embodiment of the present invention.
  • the reference numerals cite to corresponding members or elements shown already in Figure 1 .
  • the shaft 28 of the centrifugal pump is arranged to be a separate extension arranged to the end of the shaft 18 of the electric motor 12.
  • the end of the shaft 28 opposite to the impeller 20, i.e. the end facing the electric motor 12 is formed of a sleeve 28' used for housing the end of the shaft 18 of the electric motor by ordinary ways of fastening, for instance by means of a key or shrink fitting (not shown). See Figure 4 for more detailed illustration.
  • the rotation stopper/s 24 similar to those discussed in connection with Figure 1 is/are arranged in connection with the sleeve 28' of the shaft 28 of the centrifugal pump.
  • FIG 3 illustrates a partial cross sectional view of a close coupled centrifugal pump in accordance with a third preferred embodiment of the present invention.
  • the reference numerals cite to corresponding members or elements shown already in Figure 2 .
  • the fastening means 16 is divided into two parts, namely the pump casing 30, housing for instance the sealing of the pump, and an adapter 32.
  • the volute casing (not shown) is attached to the pump casing 30, and the pump casing via the adapter 32 to the flange 14 of the electric drive motor 12.
  • the hole 22 for the pin 26 in the fastening means is arranged in the adapter 32.
  • the hole 22 is preferably radial, but it may be inclined, too, as long as it is aligned with the rotation stopper 24, whereby the direction of the hole may be called substantially radial.
  • the ultimate option for the inclination of the hole 22 would be to arrange the corresponding rotation stopper 24 in connection with the sleeve 28' be such a hole that passes the interior cavity for the shaft 18 inside the sleeve 28' entirely (when looking from the axial direction).
  • the hole passes the shaft 18 of the drive motor such that when the locking pin 26 is pushed into the hole 24 it is positioned to the side of the shaft 18 and not towards the shaft 18 as shown in the Figures.
  • the rotation stopper 24 in connection with the sleeve 28' may not only be a single hole 24, but may be replaced with a series of corresponding holes or with one or more axially extending grooves or one or more axially extending members protruding substantially radially from the surface of the sleeve, here called as teeth.
  • Figure 4 illustrates a more detailed cross sectional view of the close coupled centrifugal pump 10 of Figure 3 .
  • the reference numerals cite to corresponding members or elements shown already in earlier Figures 1 . It shows, for instance, the sleeve 28' arranged by means of shrink fitting on the shaft 18 of the electric motor 12.
  • the above described structure is very advantageous in view of the manufacture of the shaft and the fastening means/adapter.
  • the shaft 28 of the centrifugal pump or the shaft sleeve 28' would be to arrange the shaft 28 of the centrifugal pump or the shaft sleeve 28' to have, for instance, a square or hexagonal cross section or at least two flat opposite surfaces for a certain part of its length, and use a flat or adjustable spanner provided in an opening in the fastening means for the locking of the shaft 28 or the shaft sleeve 28'.
  • the manufacture of a non-round cross section is much more complicated and, thus, expensive than drilling two holes.
  • a locking pin is much simpler than a flat spanner or an adjustable spanner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP12198370.4A 2012-12-20 2012-12-20 Zentrifugalpumpe mit Vorrichtung zur Verriegelung der Welle Withdrawn EP2746586A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12198370.4A EP2746586A1 (de) 2012-12-20 2012-12-20 Zentrifugalpumpe mit Vorrichtung zur Verriegelung der Welle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12198370.4A EP2746586A1 (de) 2012-12-20 2012-12-20 Zentrifugalpumpe mit Vorrichtung zur Verriegelung der Welle

Publications (1)

Publication Number Publication Date
EP2746586A1 true EP2746586A1 (de) 2014-06-25

Family

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Family Applications (1)

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EP12198370.4A Withdrawn EP2746586A1 (de) 2012-12-20 2012-12-20 Zentrifugalpumpe mit Vorrichtung zur Verriegelung der Welle

Country Status (1)

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EP (1) EP2746586A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2605002A1 (es) * 2015-09-09 2017-03-10 Iberdrola Generación Nuclear, S.A.U. Dispositivo de extracción e inserción de rodetes para bombas verticales multicelulares
FR3058186A1 (fr) * 2016-10-28 2018-05-04 Airbus Safran Launchers Sas Turbopompe de moteur-fusee comprenant un dispositif de blocage en rotation du rotor
CN108015723A (zh) * 2016-11-04 2018-05-11 株式会社牧田 通信适配器安装装置以及电动工作机
CN109162957A (zh) * 2018-11-14 2019-01-08 南京腾图节能科技有限公司 一种水泵
US10236746B2 (en) 2015-12-15 2019-03-19 Regal Beloit America, Inc. Electric machine, lock and associated method
US10711795B2 (en) 2016-07-27 2020-07-14 Regal Beloit America, Inc. Cover assembly, blower assembly and associated method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2766695A (en) * 1953-09-25 1956-10-16 Charmilles Sa Ateliers Motor-pump unit
DE19952901A1 (de) * 1999-11-03 2001-05-23 Sero Pumpenfabrik Gmbh Strömungsarbeitsmaschine
WO2004079195A2 (en) * 2003-02-28 2004-09-16 The Gorman-Rupp Company Bearing and coupling arrangement for pumps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2766695A (en) * 1953-09-25 1956-10-16 Charmilles Sa Ateliers Motor-pump unit
DE19952901A1 (de) * 1999-11-03 2001-05-23 Sero Pumpenfabrik Gmbh Strömungsarbeitsmaschine
WO2004079195A2 (en) * 2003-02-28 2004-09-16 The Gorman-Rupp Company Bearing and coupling arrangement for pumps

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2605002A1 (es) * 2015-09-09 2017-03-10 Iberdrola Generación Nuclear, S.A.U. Dispositivo de extracción e inserción de rodetes para bombas verticales multicelulares
US10236746B2 (en) 2015-12-15 2019-03-19 Regal Beloit America, Inc. Electric machine, lock and associated method
US10711795B2 (en) 2016-07-27 2020-07-14 Regal Beloit America, Inc. Cover assembly, blower assembly and associated method
FR3058186A1 (fr) * 2016-10-28 2018-05-04 Airbus Safran Launchers Sas Turbopompe de moteur-fusee comprenant un dispositif de blocage en rotation du rotor
CN108015723A (zh) * 2016-11-04 2018-05-11 株式会社牧田 通信适配器安装装置以及电动工作机
CN108015723B (zh) * 2016-11-04 2022-04-26 株式会社牧田 通信适配器安装装置以及电动工作机
CN109162957A (zh) * 2018-11-14 2019-01-08 南京腾图节能科技有限公司 一种水泵
CN109162957B (zh) * 2018-11-14 2023-08-15 南京腾图节能科技有限公司 一种水泵

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