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EP1247990A1 - Pompe centrifuge avec commande axiale auto-équilibrante - Google Patents

Pompe centrifuge avec commande axiale auto-équilibrante Download PDF

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Publication number
EP1247990A1
EP1247990A1 EP20020076078 EP02076078A EP1247990A1 EP 1247990 A1 EP1247990 A1 EP 1247990A1 EP 20020076078 EP20020076078 EP 20020076078 EP 02076078 A EP02076078 A EP 02076078A EP 1247990 A1 EP1247990 A1 EP 1247990A1
Authority
EP
European Patent Office
Prior art keywords
rotor
shaft
centrifugal pump
joint
rings
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Withdrawn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
EP20020076078
Other languages
German (de)
English (en)
Inventor
Umberto Cambiaghi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1247990A1 publication Critical patent/EP1247990A1/fr
Withdrawn legal-status Critical Current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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/042—Axially shiftable rotors
    • 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
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • 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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance

Definitions

  • the present invention refers to centrifugal pumps and in particular to a simplified centrifugal pump structure without sliding or rolling bearings, either for guiding or for driving.
  • centrifugal pumps are machines in which energy is transferred from the machine to the fluid through a rotor which moves with respect to the fluid.
  • Their structure comprises a static part and a moving part: an outer casing which contains the rotor fitted on a shaft which is moved, by means of a rigid joint, by a motor.
  • sealing members are interposed which carry out their function between flat or cylindrical interfacing surfaces, in motion relative to each other.
  • the pump is generally equipped with auxiliary devices for the lubrication of such surfaces distributing a lubrication fluid in their interstices.
  • Such lubrication devices are the source of substantial drawbacks, be it of the environmental type due to the losses and disposal of the lubrication fluids, be it of mechanical yield of the machine due to fluid leakages, or be it finally for the complicatedness and the greater size of the machine.
  • Centrifugal pump structures without lubrication devices and with a seal of the radial type between flat surfaces are known from patents USA 4,242,039, 4,501,530 and 4,913,619. Such centrifugal pump structures are, however, quite complex and have difficulties in their realisation, mounting, maintenance and adjustment.
  • the present invention refers more precisely to a centrifugal pump with a structure which is a good deal simpler and easier to realise, mount, maintain and adjust. It is, moreover, equipped with a self-balancing system of the axial drive, and corresponds, moreover to requirements of simplicity, lightness and a small size.
  • figure 1 an embodiment is shown with section views according to an axial (figure 1A) and front (figure 1B) plane, respectively, of the pump seen from AA.
  • the shaft 3 is connected to a lower washer 14 by means of a screw 17 and through a spring 12, (shock absorber), keeps the rotor 4 raised until a pressure is created in the chamber 23.
  • a spring 12 shock absorber
  • the passages 9, 10 are at their maximum as a result of which the pump can also be started up dry without problems of wearing or seizure by friction in zones 9, 10.
  • the clearances 9, 10 reduce since the pressure acting on the surface 29 pushes the rotor downwards.
  • the gasket 24 guarantees the sealing of the fluid pumped between hub 5 and rotor 4.
  • the seal between fixed casing 1 and rotor 4 is taken care of by the contact of the punctured disks or rings 7 and 8, attached to the fixed structure, with the punctured disks or rings 6 and 6bis, fixedly attached to the rotor 4.
  • the surfaces of the sealing rings are realised with very hard, low-friction materials and finishes in order to obtain a longer lifetime of the members in contact with each other.
  • the fixed rings 7 and 8 are preferably realised with materials with a high surface hardness, for example stainless steel, bronze, silicon carbide, ceramics and so on.
  • the rotating rings 6 and 6bis of the rotor 4 can be realised with self-lubrication materials with a low friction coefficient, for example with resins, containing possible additional fillers, silicon carbide, ceramic, metallic alloys.
  • Such sealing rings can also be realised with the criterion of choosing from them a sacrificial part intended to wear away to optimise the clearances of the seals also in the case of small errors in the planarity and/or in the tolerances.
  • the rotor 4 is fitted onto the shaft 3 without restriction in the axial direction; the clearances between the aforementioned sealing rings can thus vary.
  • the mechanical seal on the cover 2 is realised through a fixed ring 25 and a rotating ring 26, pressed together by a spring 11 which in the lower part is rested upon a shoulder of the rotor 4.
  • a cylindrical circular recess 28 with a shape and size which is coherent with the intermediate widening of the shaft 3, functions as a precise guide of the axial sliding of the rotor 4.
  • through-holes 27 are made which place the upper chamber 23, enclosed by the cover 2 and by the disk 8, in communication with the passage zone in which the pumped fluid receives energy and pressure from the rotor in relative motion with respect to it.
  • the rigid half-joint 15 is made integral with the drive shaft 33 with a washer 30 and a screw 31.
  • the screw 31, screwed in or unscrewed, with the joint open allows the clearances 9 and 10, upper and lower respectively, between the fixed part and the rotating part to be set, by axially displacing the rotor 4.
  • Figure 2 shows the rotating part of the pump at rest.
  • the spring 12 prevails and tends to push the rotor 4 and the hub 5 upwards, in the plane of the drawing.
  • the gasket 24 guarantees the seal, avoiding the leaking of the pumped liquid.
  • An increase in the pressure in the chamber 23 corresponds to a lowering of the rotor downwards, in the plane of the drawing of figure 3, to an increase in the distance X, between the shoulder of the shaft 20 and the upper part of the rotor 4 (figure 3), and to a corresponding decrease in the distance Y, between the end of the shaft 3 and the upper face of the hub 5, with the consequent reduction of the clearances 9 and 10.
  • the upper rotating ring 6 facing the static ring 8 thus functions as a hydraulic balancing disk adjusting the pressure in the chamber 23 as the clearance 10 varies. Then axial pushes are borne with the ring 6bis, which transfers them with the meatus of the liquid on the opposite ring 7.
  • the rotor 4 mounted on the shaft 3 with the grooved profile 20, is axially free and floating in the pumped liquid.
  • Axial sliding is absorbed by the springs 11 and 12 which work against each other; during service the pump finds its equilibrium of the axial position by itself.
  • the centrifugal pump according to the invention gives further substantial improvements and advantages with respect to the prior art. Amongst these, those which are outlined hereafter deserve at least a mention.
  • the pump according to the invention allows the replacement and maintenance of the inner parts with great ease, since there are no rolling bearings for guide and for thrust. Equally, there is no need for lubrication devices. All of the inner parts can be accessed without removing the motor and the piping. The setting of the clearances 9 and 10 between the radial sealing rings can be carried out from the outside of the cover 2, without opening the pump.
  • the pump is very light and compact and is very suitable for the naval field, where there are restrictions both in the space available and in the accessibility of the arrangement of pumps and of their motor.
  • the shaft 3 of the pump does not come into contact with the pumped liquid and therefore is preserved from possible corrosive attacks.
  • the pump can also be made to operate dry and for prolonged periods without damage of any note.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP20020076078 2001-03-21 2002-03-20 Pompe centrifuge avec commande axiale auto-équilibrante Withdrawn EP1247990A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI010593 2001-03-21
IT2001MI000593A ITMI20010593A1 (it) 2001-03-21 2001-03-21 Pompa centrifuga verticale orizzontale a spinta assiale autoequilibrata

Publications (1)

Publication Number Publication Date
EP1247990A1 true EP1247990A1 (fr) 2002-10-09

Family

ID=11447325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020076078 Withdrawn EP1247990A1 (fr) 2001-03-21 2002-03-20 Pompe centrifuge avec commande axiale auto-équilibrante

Country Status (2)

Country Link
EP (1) EP1247990A1 (fr)
IT (1) ITMI20010593A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006045676A1 (fr) * 2004-10-21 2006-05-04 Siemens Aktiengesellschaft Pompe centrifuge
WO2007004943A1 (fr) 2005-07-01 2007-01-11 Itt Manufacturing Enterprises Inc Pompe
WO2007084056A1 (fr) * 2006-01-23 2007-07-26 Itt Manufacturing Enterprises Inc Pompe destinee a pomper un liquide contamine comprenant des matieres solides
US20140308142A1 (en) * 2011-10-06 2014-10-16 Xylem Ip Holdings Llc Pump for pumping liquid comprising solid matter
US9828999B2 (en) 2013-08-15 2017-11-28 Xylem Ip Management S.Á R.L. Pump for pumping liquid as well as an impeller assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2510787A1 (de) * 1975-03-08 1976-09-16 Vaillant Joh Kg Pumpe
DE2640990A1 (de) * 1976-09-11 1978-03-16 Klein Schanzlin & Becker Ag Kreiselpumpe mit selbsttaetiger axialschubregelung an einem der laufraeder
US4242039A (en) * 1977-11-22 1980-12-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Pump impeller seals with spiral grooves
FR2775321A1 (fr) * 1998-02-24 1999-08-27 Optimex Dispositif pour l'equilibrage de la poussee axiale dans une pompe centrifuge
DE20014334U1 (de) * 2000-08-16 2001-03-01 Kraffzik, Hans-Jürgen, 33729 Bielefeld Pumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2510787A1 (de) * 1975-03-08 1976-09-16 Vaillant Joh Kg Pumpe
DE2640990A1 (de) * 1976-09-11 1978-03-16 Klein Schanzlin & Becker Ag Kreiselpumpe mit selbsttaetiger axialschubregelung an einem der laufraeder
US4242039A (en) * 1977-11-22 1980-12-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Pump impeller seals with spiral grooves
FR2775321A1 (fr) * 1998-02-24 1999-08-27 Optimex Dispositif pour l'equilibrage de la poussee axiale dans une pompe centrifuge
DE20014334U1 (de) * 2000-08-16 2001-03-01 Kraffzik, Hans-Jürgen, 33729 Bielefeld Pumpe

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006045676A1 (fr) * 2004-10-21 2006-05-04 Siemens Aktiengesellschaft Pompe centrifuge
WO2007004943A1 (fr) 2005-07-01 2007-01-11 Itt Manufacturing Enterprises Inc Pompe
EA012078B1 (ru) * 2005-07-01 2009-08-28 Ай Ти Ти Мэньюфэкчуринг Энтерпрайзиз Инк. Насос
CN101208520B (zh) * 2005-07-01 2011-04-13 Itt制造企业公司 泵
US8231337B2 (en) 2005-07-01 2012-07-31 Xylem Ip Holdings Llc Pump for pumping liquids including solid matter
NO338430B1 (no) * 2005-07-01 2016-08-15 Xylem Ip Holdings Llc Pumpe
WO2007084056A1 (fr) * 2006-01-23 2007-07-26 Itt Manufacturing Enterprises Inc Pompe destinee a pomper un liquide contamine comprenant des matieres solides
US8197192B2 (en) 2006-01-23 2012-06-12 Xylem Ip Holdings Llc Pump for pumping contaminated liquid including solid matter
US20140308142A1 (en) * 2011-10-06 2014-10-16 Xylem Ip Holdings Llc Pump for pumping liquid comprising solid matter
US9605684B2 (en) * 2011-10-06 2017-03-28 Xylem Ip Holdings Llc Pump including gap arrangement for improved pumping of solid matter
US9828999B2 (en) 2013-08-15 2017-11-28 Xylem Ip Management S.Á R.L. Pump for pumping liquid as well as an impeller assembly

Also Published As

Publication number Publication date
ITMI20010593A1 (it) 2002-09-21
ITMI20010593A0 (it) 2001-03-21

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