EP2366905B1 - Improved tight multi-stage pump - Google Patents

Improved tight multi-stage pump Download PDF

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Publication number
EP2366905B1
EP2366905B1 EP11158552.7A EP11158552A EP2366905B1 EP 2366905 B1 EP2366905 B1 EP 2366905B1 EP 11158552 A EP11158552 A EP 11158552A EP 2366905 B1 EP2366905 B1 EP 2366905B1
Authority
EP
European Patent Office
Prior art keywords
external jacket
casing cover
stage pump
lantern bracket
shaped annular
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.)
Active
Application number
EP11158552.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2366905A2 (en
EP2366905A3 (en
Inventor
Giuliano Matteazzi
Fiorenzo Zamberlan
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.)
Calpeda SpA
Original Assignee
Calpeda SpA
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 Calpeda SpA filed Critical Calpeda SpA
Publication of EP2366905A2 publication Critical patent/EP2366905A2/en
Publication of EP2366905A3 publication Critical patent/EP2366905A3/en
Application granted granted Critical
Publication of EP2366905B1 publication Critical patent/EP2366905B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F04D29/08—Sealings
    • F04D29/086—Sealings 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
    • 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

Definitions

  • the invention concerns an improved tight multi-stage pump.
  • Tightness problems occur even in multi-stage pumps, generally in the areas where the casing cover and the lantern bracket that supports the motor are coupled with the external jacket enclosing the pumping unit.
  • EP 0 406 787 A2 JP 57 103400 U , US 5 407 323 A and EP 0 566 089 A1 describe embodiments of multi-stage pumps provided with annular gaskets that are housed in annular seats where tightness is obtained thanks to an inclined annular surface that compresses the gasket.
  • the external jacket dilates due both to the internal pressure and to the heated liquid.
  • the present invention aims to eliminate or at least mitigate this recognized drawback.
  • the tightness of the coupling of the casing cover and the lantern bracket with the external jacket is obtained with no need to make costly modifications to the pump design.
  • a lantern bracket 6 that supports an electric motor 7 of an assembly of rotary and statoric members indicated as a whole by 8, arranged inside the external jacket 2.
  • rotary and statoric member assembly 8 that is hatched in the figure, it may be of any type.
  • Special gaskets 9 ensure tightness between the shaft 10 that connects the electric motor 7 to the pumping unit 8 and the lantern bracket 6, at the level of the passage hole 11 from the shaft 10 into the lantern bracket 6.
  • the casing cover 5 and the lantern bracket 6 are mechanically and removably coupled with the corresponding ends 2a of the external jacket 2 through fixing means.
  • annular gaskets 17 that are preferably but not necessarily constituted by elastomer rings commonly available on the market and known as O rings.
  • Each one of said gaskets 17, as shown in greater detail in Figures from 4 to 6, is housed in an annular seat 18 that is defined by a shaped annular area 19 present in the casing cover 5 and the lantern bracket 6, and by a counter-shaped annular area 20 present in the corresponding end of the external jacket 2, opposing each other.
  • the counter-shaped annular area 20 comprises an annular counteracting surface 20a, inclined with respect to the longitudinal axis Y defined by the external jacket 2 and suited to compress the annular gasket 17 when the casing cover 5 and the lantern bracket 6 are coupled to the external jacket 2.
  • the shaped annular area 19 present in the casing cover 5 belongs to a laminate element 21 that covers the surface of the casing cover 5 directed towards the inside of the external jacket 2 when the casing cover 5 is coupled to the external jacket 2.
  • the shaped annular area 19 present in the lantern bracket 6 belongs to a laminate element 22 that covers the surface of the lantern bracket 6 directed towards the inside of the external jacket 2 when the lantern bracket 6 is coupled to said external jacket 2.
  • each counter-shaped annular area 20, when the pump is assembled, is arranged in front of each corresponding shaped annular area 19 and is obtained in the body of the external jacket 2 at the level of each end 2a.
  • the annular seat 18 is defined, whose cross section, obtained according to a plane passing through the longitudinal axis Y defined by the external jacket 2, substantially has the shape of a right-angled trapezium whose sloping side corresponds to the annular counteracting surface 20a.
  • annular surface 20a counteracts the gasket 17 when the fixing means tighten the casing cover 5 and the lantern bracket 6 against the ends 2a, 2b of the external jacket 2 with a force that generates:
  • the degree of tightness is defined by the degree of tightening of the fixing means.
  • the fixing means as shown in detail in Figures 2 and 3 , comprise a plurality of tie rods 12, wherein each tie rod 12 has a first threaded end 12a screwed into a threaded hole 14 present in the casing cover 5 and a second threaded end 12b constrained into a through hole made in the lantern bracket 6 through a nut 16.
  • the external jacket 2 has a plurality of shaped annular portions 28 suited to make the external jacket 2 elastically yielding along the direction defined by the longitudinal axis Y.
  • the shaped annular portions 28 have their convex side directed towards the inside of the external jacket 2, are arranged according to planes that are parallel to each other and arranged crosswise to the longitudinal axis of the external jacket 2 and serve to make it yield elastically when it is subjected to axial loads.
  • the first object is achieved, that is, the object to improve the tightness of the gasket 17 by increasing adherence against the walls of the annular seat 18 in which it is contained.
  • the invention also achieves the object to guarantee that the gaskets are subjected to a substantially constant compression force independently of the pump temperature and operating pressure, by properly adjusting the degree of tightening of the tie rods 12.
  • Tightness is improved also by improving the mechanical rigidity of the coupling of the casing cover 5 and the lantern bracket 6 to the external jacket 2.
  • each end 2a of the external jacket 2 remains constrained in the annular groove 25 in which it is housed, substantially eliminating any radial movement of the external jacket that may occur in that area due to heat or pressure.
  • each one of the shaped annular portions of the external jacket 2 carried out according to a plane passing through the longitudinal axis Y has substantially the shape of an isosceles trapezium.
  • said shaped portions can have any profile and shape, for example the shape of an arc of a circle or another shape, and their convex side can be directed towards the inside or the outside of the external jacket 2.
  • suction port 3 and the delivery port 4 it can be observed that at the level of each of them there is a sleeve 30, 40 that is connected directly to the external jacket 2 through a weld bead 31, 41 carried out by means of one of the known automatic or manual welding systems.
  • each sleeve 30, 40 can be provided, for example, with a flange 32, 42 suited to house a corresponding counter-flange coupled therewith, not illustrated in the drawings, in order to connect the pump 1 to external suction and delivery pipes that are not illustrated, either.
  • sleeves 30, 40 can be connected to the external pipes via threading or other known joining systems.
  • each end of the external jacket 2 is mechanically connected to the corresponding casing cover 5 and the corresponding lantern bracket 6 so that it is different from the procedure described and illustrated herein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP11158552.7A 2010-03-18 2011-03-16 Improved tight multi-stage pump Active EP2366905B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI2010A000075A IT1398811B1 (it) 2010-03-18 2010-03-18 Pompa multistadio a tenuta perfezionata

Publications (3)

Publication Number Publication Date
EP2366905A2 EP2366905A2 (en) 2011-09-21
EP2366905A3 EP2366905A3 (en) 2012-11-21
EP2366905B1 true EP2366905B1 (en) 2014-12-24

Family

ID=43012668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11158552.7A Active EP2366905B1 (en) 2010-03-18 2011-03-16 Improved tight multi-stage pump

Country Status (5)

Country Link
EP (1) EP2366905B1 (zh)
CN (1) CN102192190B (zh)
DK (1) DK2366905T3 (zh)
HK (1) HK1160908A1 (zh)
IT (1) IT1398811B1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2818722B1 (de) * 2013-06-24 2019-01-09 Grundfos Holding A/S Kreiselpumpe
DE102014207562A1 (de) * 2014-04-22 2015-10-22 E.G.O. Elektro-Gerätebau GmbH Pumpe
US20180058464A1 (en) * 2016-08-24 2018-03-01 Q.E.D. Environmental Systems, Inc. Pump Having Edge Mounted O-Ring Seal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6143999Y2 (zh) * 1980-12-17 1986-12-11
IT1234126B (it) * 1989-07-05 1992-04-29 Nowax Srl Cassa statorica, particolarmente per pompa radiale centrifuga, nonche' metodo per la sua realizzazione
US5385444A (en) * 1992-04-14 1995-01-31 Ebara Corporation Pump casing made of sheet metal
US5407323A (en) * 1994-05-09 1995-04-18 Sta-Rite Industries, Inc. Fluid pump with integral filament-wound housing
CN2643030Y (zh) * 2003-07-22 2004-09-22 何必超 便拆式多级水泵
JP4633396B2 (ja) * 2004-07-16 2011-02-16 株式会社荏原製作所 遠心式ポンプ

Also Published As

Publication number Publication date
DK2366905T3 (en) 2015-03-23
IT1398811B1 (it) 2013-03-18
EP2366905A2 (en) 2011-09-21
EP2366905A3 (en) 2012-11-21
CN102192190A (zh) 2011-09-21
HK1160908A1 (zh) 2012-08-17
CN102192190B (zh) 2014-01-29
ITVI20100075A1 (it) 2011-09-19

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