EP1729009A1 - Kreiselpumpe - Google Patents

Kreiselpumpe Download PDF

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Publication number
EP1729009A1
EP1729009A1 EP05425397A EP05425397A EP1729009A1 EP 1729009 A1 EP1729009 A1 EP 1729009A1 EP 05425397 A EP05425397 A EP 05425397A EP 05425397 A EP05425397 A EP 05425397A EP 1729009 A1 EP1729009 A1 EP 1729009A1
Authority
EP
European Patent Office
Prior art keywords
pipe
valve
fluid
outfeed
pump 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.)
Granted
Application number
EP05425397A
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English (en)
French (fr)
Other versions
EP1729009B1 (de
Inventor
Silvano Pedrollo
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.)
Pedrollo SpA
Original Assignee
Pedrollo SpA
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Filing date
Publication date
Application filed by Pedrollo SpA filed Critical Pedrollo SpA
Priority to AT05425397T priority Critical patent/ATE366878T1/de
Priority to EP05425397A priority patent/EP1729009B1/de
Priority to DE602005001620T priority patent/DE602005001620D1/de
Publication of EP1729009A1 publication Critical patent/EP1729009A1/de
Application granted granted Critical
Publication of EP1729009B1 publication Critical patent/EP1729009B1/de
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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid

Definitions

  • the present invention relates to a centrifugal pump, in particular a multi-stage self-priming centrifugal pump used in hydraulic systems.
  • centrifugal hydraulic pumps are marketed which are suitable for sucking a fluid through an infeed (intake) pipe and conveying the fluid towards an outfeed (delivery) pipe.
  • centrifugal pumps consist of a containment body in which there extend in succession a plurality of coaxial stages with special impellers.
  • the impellers are keyed to a rotary shaft whose rotation is driven by an electric motor.
  • each impeller has a set of blades shaped in such a way as to suck the fluid, usually water, from a central zone of the impeller and conveyor it towards a peripheral zone.
  • each stage is equipped with a fixed ring-shaped element (diffuser) inserted between two impellers.
  • Each ring-shaped element has a set of deflectors suitable for conveying the flow out of the peripheral zone of the previous impeller and towards the central zone of the next impeller.
  • centrifugal pumps also have a self-priming mechanism so that they can expel the air present in the infeed pipe by recirculating water, so as to guarantee a constant supply of liquid to the impellers.
  • centrifugal impellers must always operate with water in the pump, otherwise it will be unprimed and there will be a sudden drop in the head.
  • the self-priming device supplies the water in the impellers in such a way as to keep water in the pump even when the infeed pipe contains a quantity of air to be expelled.
  • the self-priming device has a valve inserted between the outfeed pipe and the infeed pipe, which can be switched between a position in which it does not allow water to pass from the outfeed pipe to the infeed pipe and a position in which it allows the water to pass from the outfeed pipe to the infeed pipe.
  • the water pressure in the outfeed pipe keeps the valve closed.
  • the pressure in the outfeed pipe is reduced, allowing the valve to switch to the open position, in which it allows water to pass from the delivery pipe to the infeed pipe.
  • the valve remains open even during the pump initial restart step, that is to say, until the pressure in the outfeed pipe reaches a predetermined value able to switch the valve to the closed condition.
  • centrifugal pumps briefly described above have an important disadvantage chiefly linked to the fatigue failure conditions of the parts subject to pulsing pressure and to water hammering.
  • the pressure of the water delivered in the pump may vary depending on the conditions of use. In this situation, high pressure conditions may be created in the pump, which damage the containment body. Consequently, the high pressure water may flow out of the containment body or even interfere with correct operation of the pump.
  • the technical need which forms the basis of the present invention is to provide a centrifugal pump which substantially overcomes the above-mentioned disadvantage.
  • an important aim of the invention is to provide a centrifugal pump which during operation can maintain a level of pressure in the pump not higher than a predetermined level.
  • Another aim of the present invention is to provide a centrifugal pump able to always keep the water in the pump, avoiding the use of safety valves on the delivery pipe.
  • the numeral 1 denotes as a whole the centrifugal pump in accordance with the invention.
  • the pump 1 has a containment body 2 with mainly cylindrical extension, having a first end 2a which extends transversally to the longitudinal extension of the containment body 2.
  • the first end 2a has a hole 3 which is part of an infeed pipe 4 for the water sucked in by the pump.
  • centrifugal pump 1 suitable for sucking up water.
  • Such pumps are widely used in various types of hydraulic systems.
  • the pump 1 may be used to suck up any other type of fluid in the liquid state.
  • the containment body 2 also has a side surface in which there is a hole 5, which is part of an outfeed pipe 6 for the water sucked up by the pump 1.
  • the holes 3, 5 of the infeed pipe 4 and the outfeed pipe 6 can advantageously be connected to respective pipes of a water system to which the pump 1 is connected. However, in other embodiments the two holes 3, 5 are positioned in other points.
  • the containment body 2 also has a second end 2b, opposite the first end 2a, to which the drive means 7 are connected.
  • the drive means illustrated only in Figure 1, preferably consist of a known type of electric motor, having a rotary shaft 8 which extends along the longitudinal extension of the body 2 and inside the body 2.
  • At least one intake stage 9 consisting of at least one impeller 10 keyed to the shaft 8 to suck water from the infeed pipe 4 and convey it to the outfeed pipe 6.
  • the pump 1 may have a plurality of intake stages 9, consecutive and connected to one another along the longitudinal extension of the body 2.
  • each stage 9 consists of an impeller 10 and a diffuser 11, the latter coaxial with and alongside the respective impeller 10.
  • the impeller 10 substantially consists of two disks alongside one another and between which special blades are housed, for conveying the water in rotation from a central water passage zone 10a to a peripheral outfeed zone 10b.
  • the diffuser 11 consists of a ring-shaped deflector 11a coaxially inserted, with the relative impeller, in a tubular body 11b.
  • the deflector 11a is designed to convey the water out of the peripheral zone 10b of the impeller 10 and towards the central zone 10a of the next stage 9.
  • the tubular bodies 11b are alongside one another in such a way that they form a closed cylindrical body 12.
  • tubular bodies 11b are coaxially connected to one another to form a single cylindrical body 12 located in the containment body 2 and housing the impellers 10.
  • the pump 1 also has a connecting collar 13, inside the body 2 at the infeed pipe 4 hole 3.
  • the collar 13 substantially consists of a ring-shaped element which can be connected between the stage 9 next to the infeed pipe 4 and the inner surface of the body 2 (see Figure 1).
  • the pump 1 has an end diffuser 14, connected to the stage 9 next to the outfeed pipe 6 and having a set of deflectors suitable for eliminating any water turbulence at the outfeed of the impeller 10 closest to the outfeed pipe 6.
  • the end diffuser 14 has an axial fluid infeed hole and radial outfeed holes.
  • the cylindrical body 12 is detached from the inner surface of the containment body 2 to form both the outfeed pipe 6 and an auxiliary pipe 15.
  • the auxiliary pipe 15 extends inside the pump 1 from the outfeed pipe 6 towards the infeed pipe 4.
  • the auxiliary pipe 15 has a substantially cylindrical shape surrounding the cylindrical body 12 and forms a first end 15a at the connecting collar 13, and a second end 15b opposite the first end 15a, located at the outfeed pipe 6.
  • the pump 1 also comprises a recirculation part 16 inserted between the outfeed pipe 6 and the infeed pipe 4 to allow the passage of water from the outfeed pipe 6 to the infeed pipe 4 in an initial pump starting step.
  • the recirculation part 16 is located at the first end 15a of the auxiliary pipe 15, next to a central zone 10a of the impeller 10 near the infeed pipe 4.
  • the recirculation part 16 has a primary self-priming valve 17 which can be switched between an open condition in which it allows water to pass from the auxiliary pipe 15 to the infeed pipe 4 (see Figure 3), and a closed position in which it blocks the auxiliary pipe 15 and prevents the passage of water (see Figures 2 and 4).
  • the recirculation part 16 comprises a connecting plate 18 located between the infeed pipe and the auxiliary pipe.
  • the plate 18 advantageously engages with the collar 13 and substantially has the shape of a parallelepiped.
  • the primary valve 17 is housed in an opening 18a made in the plate, forming the section which allows the passage of water when the primary valve 17 is open.
  • valve 17 locking means 26 to keep the valve 17 open until the pressure of the fluid in the outfeed pipe 6 exceeds a predetermined pressure value corresponding to pump steady state operation (transient operation during self-priming).
  • the pump 1 also comprises a safety valve 19 which can switch between an open condition in which it allows water to pass from the outfeed pipe 6 to the infeed pipe 4 (Figure 4), and a closed condition in which it does not allow the passage of water ( Figures 2 and 3).
  • safety valve 19 locking means 26 to keep the valve 19 closed until the pressure of the fluid in the outfeed pipe 6 exceeds a predetermined pressure value P corresponding to the maximum delivery pressure value allowed.
  • the safety valve 19 is connected to the recirculation part 16 and in particular is alongside the primary valve 17.
  • the valve 19 is switched to the open condition.
  • the safety valve 19 is also housed in an opening 18b made in the plate 18 and forming the section which allows the passage of water when the safety valve 19 is open. Therefore, in the embodiment illustrated, the two openings 18a, 18b are alongside one another and both communicate between the outfeed pipe 6 (by means of the auxiliary pipe 15) and the infeed pipe 4.
  • each valve 17, 19 has a cylindrical portion 20 which slides in the respective opening 18a 18b, having a first end 20a located towards the auxiliary pipe 15 and a second end 20b opposite the first end 20a located at the infeed pipe 4.
  • Each valve 17, 19 also has a head 21 connected to the respective first end 20a.
  • the head 21 is diskshaped, extending flat transversally to the longitudinal extension of the cylindrical portion 20. It should be noticed that the head 20 may be inserted in the opening 18a, 18b in such a way that it blocks in the respective valve 17, 19 closed position; whilst in the valve 19, 17 open position the head 21 is detached from the opening 18a, 18b.
  • each head 21 in the valve 17, 19 closed position engages at a narrowing in each opening 18a, 18b.
  • each head 21 has a special O-ring 21a in contact with the narrowing and guaranteeing the valve hydraulic seal.
  • the narrowing of the opening 18b housing the safety valve 19 is achieved in the part towards the auxiliary pipe 15. In this way, when the safety valve 19 is open, the head 21 is moved towards the infeed pipe 4 (see Figure 4).
  • the recirculation part 16 has a supporting element 22 connected to the plate 18 and having respective sliding seats 23 housing the second ends 20b of each cylindrical portion 20.
  • the supporting element 22 consists of a flat element connected to the plate 18 and detached from it to form a passage 24 for the water from the openings 18a, 18b to the infeed pipe 4.
  • the supporting element 22 is housed in the infeed pipe 4 and is connected to the plate 18 by respective peripheral edges which can engage with one another to form a box-shaped body 25 in which the passage 24 for the water is made.
  • the elastic element 26a connected to the safety valve 19 pushes the head 21 towards the narrowing in the opening 18b, keeping the safety valve 19 closed.
  • the drive means 7 cause the impellers 10 to rotate which, as described above, suck the water from the infeed pipe 4 and convey it towards the outfeed pipe 6.
  • part of the water flowing out of the pipe 6 also passes through the auxiliary pipe 15.
  • both of the valves 17, 19 are in the closed condition in which they do not allow water to pass from the auxiliary pipe 15 to the infeed pipe 4 ( Figure 2) .
  • the safety valve 19 switches, overcoming the resistance of the elastic element 26a, to the open position, allowing water to pass from the delivery pipe 6 to the infeed pipe 4 ( Figure 4). It should be noticed that the pressurised water in the auxiliary pipe 15 pushes against the head 21 of the safety valve 19. The elastic element 26a of the safety valve 19 keeps the valve locked in the closed condition. If the water pressure increases, the action of the elastic element 26a is overcome and the head 21 of the valve 19 is moved out of the opening 18b, allowing water to pass through the opening 18b, thus returning the water to the infeed pipe 4. In this way, the safety valve 19 is opened when the pressure of the water flowing out rises above the limit value P. As a result, said pressure is always kept below a predetermined pressure value P.
  • the impellers suck in the water returned into circulation by the primary valve 17 until the pressure in the auxiliary pipe 15 again pushes the valve 17 into the closed position (as happens when the pump is primed with a consequent absence of air in the intake pipe).
  • the invention brings important advantages.
  • the safety valve 19 allows the water delivered to be recirculated, re-establishing an optimum pressure value.
  • the safety valve 19 returns the water into circulation in the infeed pipe 4, preventing the water from flowing out of the pump 1 body 2, unlike the safety devices known today which discharge the water to the outside of the system delivery pipe.
  • the solution provided by the present invention is also advantageous compared with solutions involving the creation of a by-pass outside the pump, since such solutions are significantly more expensive and bulky.
  • the pressure value P which causes the safety valve 19 to open may be set by acting on the counteracting element 26.
  • the physical characteristics of the counteracting element 26 (number of coils, spring cross-section) can be used to define the value P above which the spring allows water to pass towards the infeed pipe 4.
  • valves 17, 19 are contained in a single box-shaped body 25 inserted in the pump, thus limiting the pump 1 overall dimensions.
  • Both the primary valve 17 which allows pump self-priming, and the safety valve 19 for maintaining the predetermined pressure value P are connected to the box-shaped body 25.
  • any maintenance work on both valves may be carried out by simply substituting only the box-shaped body 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Reciprocating Pumps (AREA)
EP05425397A 2005-05-31 2005-05-31 Kreiselpumpe Expired - Lifetime EP1729009B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT05425397T ATE366878T1 (de) 2005-05-31 2005-05-31 Kreiselpumpe
EP05425397A EP1729009B1 (de) 2005-05-31 2005-05-31 Kreiselpumpe
DE602005001620T DE602005001620D1 (de) 2005-05-31 2005-05-31 Kreiselpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425397A EP1729009B1 (de) 2005-05-31 2005-05-31 Kreiselpumpe

Publications (2)

Publication Number Publication Date
EP1729009A1 true EP1729009A1 (de) 2006-12-06
EP1729009B1 EP1729009B1 (de) 2007-07-11

Family

ID=34943213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425397A Expired - Lifetime EP1729009B1 (de) 2005-05-31 2005-05-31 Kreiselpumpe

Country Status (3)

Country Link
EP (1) EP1729009B1 (de)
AT (1) ATE366878T1 (de)
DE (1) DE602005001620D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120251308A1 (en) * 2011-03-29 2012-10-04 Grundfos Management A/S Multi-stage centrifugal pump unit
EP3929445A1 (de) * 2020-06-22 2021-12-29 Grundfos Holding A/S Zentrifugalpumpenvorrichtung
EP4191065A1 (de) * 2021-12-02 2023-06-07 Husqvarna Ab Bewässerungspumpe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3244066B1 (de) * 2016-05-12 2020-11-18 Grundfos Holding A/S Zentrifugalpumpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1913242A1 (de) * 1969-03-15 1970-09-24 Wilfried Niemes Vorrichtung zur Konstanthaltung der Foerderhoehe von Kreiselpumpen bei variabler Foerdermenge
DE2106852A1 (de) * 1971-02-13 1972-09-14 Sueddeutsche Kuehler Behr Heizungsumwälzpumpe
WO1993011360A1 (en) * 1991-12-05 1993-06-10 Nocchi Pompe S.P.A. Centrifugal pump with adaptor for various valves
DE19709484A1 (de) * 1997-03-07 1998-09-10 Hella Kg Hueck & Co Einrichtung zur Regelung der Kühlmitteltemperatur einer Brennkraftmaschine in einem Kraftfahrzeug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1913242A1 (de) * 1969-03-15 1970-09-24 Wilfried Niemes Vorrichtung zur Konstanthaltung der Foerderhoehe von Kreiselpumpen bei variabler Foerdermenge
DE2106852A1 (de) * 1971-02-13 1972-09-14 Sueddeutsche Kuehler Behr Heizungsumwälzpumpe
WO1993011360A1 (en) * 1991-12-05 1993-06-10 Nocchi Pompe S.P.A. Centrifugal pump with adaptor for various valves
DE19709484A1 (de) * 1997-03-07 1998-09-10 Hella Kg Hueck & Co Einrichtung zur Regelung der Kühlmitteltemperatur einer Brennkraftmaschine in einem Kraftfahrzeug

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120251308A1 (en) * 2011-03-29 2012-10-04 Grundfos Management A/S Multi-stage centrifugal pump unit
CN102734176A (zh) * 2011-03-29 2012-10-17 格伦德福斯管理联合股份公司 多级离心泵机组
AU2012201654B2 (en) * 2011-03-29 2015-08-20 Grundfos Management A/S Centrifugal radial pumps and method for manufacturing thereof
US9879680B2 (en) * 2011-03-29 2018-01-30 Grundfos Management A/S Multi-stage centrifugal pump unit
EP2505842B1 (de) 2011-03-29 2019-12-25 Grundfos Management a/s Mehrstufiges kreiselpumpenaggregat
EP3929445A1 (de) * 2020-06-22 2021-12-29 Grundfos Holding A/S Zentrifugalpumpenvorrichtung
CN113898591A (zh) * 2020-06-22 2022-01-07 格兰富控股联合股份公司 离心泵装置
US11746795B2 (en) 2020-06-22 2023-09-05 Grundfos Holding A/S Centrifugal pump device
CN113898591B (zh) * 2020-06-22 2024-03-01 格兰富控股联合股份公司 离心泵装置
EP4191065A1 (de) * 2021-12-02 2023-06-07 Husqvarna Ab Bewässerungspumpe

Also Published As

Publication number Publication date
EP1729009B1 (de) 2007-07-11
ATE366878T1 (de) 2007-08-15
DE602005001620D1 (de) 2007-08-23

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