WO2007014876A1 - Pompe hydraulique - Google Patents

Pompe hydraulique Download PDF

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Publication number
WO2007014876A1
WO2007014876A1 PCT/EP2006/064623 EP2006064623W WO2007014876A1 WO 2007014876 A1 WO2007014876 A1 WO 2007014876A1 EP 2006064623 W EP2006064623 W EP 2006064623W WO 2007014876 A1 WO2007014876 A1 WO 2007014876A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic pump
pump according
box
annular wall
sleeve
Prior art date
Application number
PCT/EP2006/064623
Other languages
English (en)
Inventor
Francesco Sinico
Anders Lykkegaard Moller
Original Assignee
Dab Pumps S.P.A.
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 Dab Pumps S.P.A. filed Critical Dab Pumps S.P.A.
Priority to EP06792562A priority Critical patent/EP1910684A1/fr
Publication of WO2007014876A1 publication Critical patent/WO2007014876A1/fr

Links

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
    • F04D29/40—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
    • F04D29/4293—Details of fluid inlet or outlet
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates to a hydraulic pump, particularly but not exclusively of the vertical multistage type.
  • hydraulic pumps for water systems of users of various sizes are constituted generally by an outer steel casing, in which the water intake and delivery ports and the chamber of the impeller assembly (with one or more impellers, depending on the number of stages) are provided, an electric motor, arranged inside or outside such casing, being connected to said impeller assembly.
  • the pump casing is usually constituted by a jacket for containing the impeller assembly, which is enclosed at its ends respectively by a closure head and by a pump body, in which there is an intake port and a delivery port, which are connected functionally respectively to the inlet and the outlet of the impeller assembly.
  • the various components are mutually connected so as to ensure watertightness.
  • the closure head is connected to the pump body by means of bolted braces; the electric motor is fixed to the head and is connected to the impeller assembly.
  • the various characteristics that a pump must have include the resistance of the various components to corrosion caused by water.
  • the jacket, the closure head and the pump body must be made of a material that has structural strength characteristics, since they have to bear a certain load.
  • the material that has both load resistance characteristics and corrosion resistance characteristics is stainless steel.
  • the pump body is one of the most critical in terms of cost.
  • This component in fact has a complex internal geometry and has to be machined so as to ensure, in certain parts thereof, a finish that allows correct mating with other components in order to avoid inaccurate hydraulic connections and consequent leaks.
  • Further, such pump body is also one of the heaviest components, since it also acts as a footing for the pump.
  • the aim of the present invention is to provide a hydraulic pump that solves the problems noted in known types.
  • an object of the present invention is to provide a hydraulic pump that has a reduced use of stainless steel with respect to known types and at the same time ensures a performance, in terms of corrosion resistance, that can be compared to known types.
  • Another object of the present invention is to provide a hydraulic pump that has reduced costs with respect to known types for an equal corrosion resistance performance.
  • Another object of the present invention is to provide a hydraulic pump that reduces the number of processes to be performed on the pump body. Another object of the present invention is to provide a hydraulic pump that can be manufactured with known systems and technologies.
  • a hydraulic pump of the type that comprises a jacket for containing the impeller assembly, which is enclosed at its ends respectively by a closure head and by a pump body in which an intake port and a delivery port are formed, said ports being connected functionally respectively to the inlet and the outlet of said impeller assembly, characterized in that in said pump body there is a compartment in which a box-like body made of plastic material is inserted which is open toward said jacket and on which in turn two mutually isolated chambers are formed, a first one of said chambers being connected directly to said intake port and a second one of said chambers being connected directly to said delivery port.
  • Figure 1 is an exploded perspective view of the lower portion of a hydraulic pump according to the invention, in particular related to the pump body thereof;
  • Figure 2 is an external perspective view of a hydraulic pump according to the invention
  • Figure 3 is a sectional side view of the lower portion of the pump of
  • Figure 4 is a sectional plan view of the pump body of a pump according to the invention.
  • Figure 5 is a sectional side view of the lower portion of a second embodiment of a pump according to the invention
  • Figure 6 is a sectional side view of the lower portion of a third embodiment of a pump according to the invention.
  • Figure 7 is a sectional side view of the lower portion of a fourth embodiment of a pump according to the invention.
  • Figure 8 is a sectional side view of the lower portion of a fifth embodiment of a pump according to the invention.
  • a hydraulic pump according to the invention is generally designated by the reference numeral 10.
  • the hydraulic pump 10 comprises a jacket 11 for containing an impeller assembly 12, which is shown schematically in broken lines in Figures 1 and 3; in this embodiment, the pump is of the multistage vertical type and the impeller assembly corresponds to a multistage impeller.
  • the jacket 11 which has a cylindrical contour, is enclosed at its ends respectively by a closure head 13 and by a pump body 14, as clearly visible in Figure 2.
  • the closure head 13 and the pump body 14 are connected by tension members 15 in a per se known manner.
  • An electric motor 16 is fixed externally on the closure head 13 and its output shaft passes through the head 13 in order to connect to the impeller assembly 12 inside the jacket 11.
  • An intake port 17 and a delivery port 18 are formed on the pump body
  • a cylindrical compartment 19 is formed in the pump body 14 and a box-like body 20 is inserted therein; the body is substantially shaped complementarity to the compartment 19 and is open toward the jacket 11; in turn, two mutually isolated chambers are formed in the body: a first chamber
  • the box-like body 20 is made of a material which is resistant to corrosion.
  • the corrosion-resistant material is plastic material (preferably for injection molding), but in other embodiments, as described hereinafter, said material may be stainless steel (or optionally a combination of stainless steel and plastic material); it is evident that other materials with corrosion-resistance properties also can be used according to requirements.
  • the box-like body 20 comprises a bottom 23, from which an outer annular wall 24 protrudes, and, centrally thereto, an inner annular wall 25 protrudes; in particular, both the outer annular wall 24 and the inner annular wall 25 are substantially circular and are coaxial.
  • the space comprised between the outer annular wall 24 and the inner annular wall 25 forms the second chamber 22, while the space inside the inner annular wall 25 forms the first chamber 21.
  • the second chamber 22, as described more clearly hereinafter, is crossed by the pressurized water proximate to the delivery; for this reason, the outer annular wall 24 rests against the inner lateral surface of the compartment 19, so as to withstand the thrust of the pressure that otherwise might break the outer annular wall 24.
  • a first opening 26 and a second opening 27 are formed on the outer annular wall 24 and are centered respectively on the intake port 17 and on the delivery port 18.
  • a tubular connecting portion 28 protrudes from the first opening 26 and is open onto the first chamber 21.
  • the intake port 17 and the delivery port 18 are constituted by two respective bushings 29, which are monolithic with the pump body 14 and have a structural containment function; an intake sleeve 30 and a delivery sleeve 31 are inserted respectively therein, are connected directly respectively to the first chamber 21 and to the second chamber 22, and act as hydraulic manifolds; in practice, the water flows in the sleeves 30 and 31.
  • the sleeves 30 and 31 are made of a corrosion-resistant material, such as preferably stainless steel.
  • the bushings 29 have a flange-shaped end 32.
  • the sleeves 30 and 31 have identical shapes and dimensions and both have an end which lies outside the respective bushing
  • the intake and delivery sleeves 30 and 31 are inserted respectively in the first and second openings 26 and 27; the intake sleeve 30 is coupled with a watertight seal to the tubular portion 28, while the delivery sleeve 31 is coupled with a watertight seal to a collar 34, which is monolithic with the box-like body 20, is arranged inside the second chamber 22, and in practice forms the second opening 27.
  • the hydraulic seal of the sleeves 30 and 31 is provided by corresponding gasket rings 35, which are arranged between a shoulder 36, formed proximate to the internal end of each sleeve, and a corresponding complementary shoulder 37, which is formed respectively on the tubular portion 28 and on the collar 34.
  • the collar 34 is formed by a circular hole, which is formed in a wall 38 arranged in front of the second opening 27.
  • the inner annular wall 25, at its portion arranged in front of the second opening 27, is shaped like a cusp 39, so as to guide the flow of water from the second chamber 22 toward the intake port 18; in particular, the cusp 39 is monolithic with the wall 38.
  • the free end edge of the outer annular wall 24 of the box-like body 20 forms a laterally protruding tang 40, which is useful to lock in a sandwich-like fashion, together with an upper rim 41 of the pump body 14, an additional sealing ring 42.
  • the flat element 43 for stiffening the box-like body 20, which is coupled to the free edges of the outer annular wall 24 and of the inner annular wall 25; the flat element 43 is preferably made of plastic material.
  • the flat element 43 is circular and is constituted by an outer annular portion 44, which makes contact internally with the free end edge of the outer annular wall 24, and an inner annular portion 45, which makes contact with the inner annular wall 25.
  • the outer annular portion 44 and the inner annular portion 45 are connected by radial portions 46, so as to form angular water flow sectors 47 in output from the impeller assembly 12 and entering the second chamber 22.
  • An angular sector 47a which corresponds to the region of the second opening 27, is closed in order to reduce the turbulence of the water in output.
  • Figure 5 illustrates a second embodiment of a pump according to the invention, generally designated by the reference numeral 100.
  • the laterally protruding tang 140 of the outer annular wall 124 of the box-like body 120 has, with the upper rim 141 of the pump body 114, a mating of the male-female type with vertical insertion.
  • annular rib 150 protrudes from the upper rim 141 and is inserted in a complementarily shaped coupling seat 151, which is formed on the lower portion of the laterally protruding tang 140.
  • the impeller assembly 112 is arranged on an annular support 152, which is flared upward and is coupled to the upper end of the inner annular wall 125 that forms the first chamber 121.
  • each sleeve 130 and 131 is provided by a corresponding sealing ring 135, which is arranged hermetically on the outer wall of the corresponding sleeve and is locked between a corresponding complementary shoulder 137 formed on the box- like body 120 proximate to the corresponding opening 126 (or 127) and a locking ring 153, which is arranged at the opening 126 and is blocked on one side by the internal wall of the pump body 114.
  • the material that forms the box-like body 120 is plastic material or stainless steel or another material that has corrosion-resistance characteristics.
  • Figure 6 illustrates a third embodiment of a pump according to the invention, generally designated by the reference numeral 200.
  • a tubular core 255 which is shaped complementarily with respect to the wall 225 of the chamber.
  • the tubular core 255 has a further opening 256, which is arranged at the tubular portion 228 and is open in an upper region.
  • the upper portions of the wall of the tubular core 255 are flared upward so as to form an annular support 252 for the impeller assembly 212.
  • Such tubular core also is made of a material that has corrosion- resistance characteristics, such as preferably stainless steel.
  • Figure 7 illustrates a fourth embodiment of a pump according to the invention, generally designated by the reference numeral 300.
  • the box-like body 320 is constituted by two separate bodies: a first box-like body 320a is constituted by the bottom 323, provided centrally with a through hole 356, from which the outer annular wall 324 protrudes, and a second box-like body 320b, which is constituted by a cup which is open upward and is formed by a bottom and by the internal wall 325, on which the tubular portion 328 for connection to the first opening 326 is provided.
  • the lower part of the second box-like body 320b is inserted in the hole provided centrally with respect to the bottom 323 of the first box-like body 320a; watertightness is ensured by a first gasket 357, which is arranged between the wall of the hole 356 and the wall of the second box- like body 320b.
  • annular slot for accommodating a second gasket 358 for providing a seal for the sleeve 330.
  • the upper portions of the internal wall 325 of the second box-like body 320b are flared upward so as to form an annular support 352 for the impeller assembly 312.
  • the materials that form the first box-like body 320a and the second box-like body 320b are of the type with corrosion resistance; for example, they can be plastic material and/or stainless steel, depending on the structural requirements.
  • Figure 8 illustrates a fifth embodiment of a pump according to the invention, generally designated by the reference numeral 400.
  • the box-like body 420 has a simplified structure with respect to the embodiments described so far.
  • This structure in fact has the box-like body 420 monolithically made of a material which has corrosion-resistance and high structural strength characteristics, such as for example stainless steel.
  • the box-like body does not require elements for stiffening the outer walls 424.
  • the impeller assembly 412 is arranged on an annular support 452, which is flared upward and is coupled to the upper end of the internal annular wall 425 that forms the first chamber 421.
  • the invention thus described solves the problems noted in known types of hydraulic pump; in particular, the present invention provides a hydraulic pump that allows to have high- quality "corrosion-resistance" performance even with a limited use of stainless steel.
  • the box-like body 20 is made of a corrosion-resistant material, such as for example plastic material or stainless steel (but other materials with corrosion-resistance properties can be used); as regards the case of the use of plastic material, the production of a component with complex geometry such as the box-like body is facilitated by the low cost of the plastic molding process with respect to the cost of the cast-iron casting process and of any subsequent finishing work.
  • a corrosion-resistant material such as for example plastic material or stainless steel (but other materials with corrosion-resistance properties can be used)
  • the intake and delivery ports comprise the sleeves 30 and 31, which are made of stainless steel and have a simple geometry and whose annular abutment 32 can therefore be manufactured cheaply with such a surface finish as to ensure correct mating with the pipes to which the pump is to be connected.
  • the overall weight of the pump is reduced by means of the introduction of plastic materials replacing stainless steel or cast iron parts.
  • plastic materials replacing stainless steel or cast iron parts.
  • Such a structure of the pump further allows to choose the materials (stainless steel, cast iron, plastics and others) that are best suited to the type of liquid to be pumped and to the particular operating requirements, thus increasing design flexibility.
  • a very important aspect that derives from the particular modular structure of the pump is that the designer can compose the pump by choosing the components according to requirements in terms of corrosion resistance, structural strength and cost.
  • the box-like body in the most convenient manner, by using only plastic material (which has corrosion resistance but low structural strength), only stainless steel (which has corrosion resistance and high structural strength) or a combination thereof (or of materials with equivalent properties).
  • the materials employed may be any according to requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Pompe hydraulique (10) du type constitué d'une gaine (11) destinée à contenir un ensemble impulseur (12) qui est fermée à ses extrémités respectivement par une tête de fermeture (13) et par un corps de pompe (14) dans lequel sont formés un orifice d'admission (17) et un orifice de distribution (18), les orifices étant connectés fonctionnellement, respectivement à l'entrée et à la sortie de l'ensemble impulseur (12). Un compartiment (19) est agencé sur le corps de pompe (14) et un corps de type boîte (20) est inséré dans celui-ci et ouvre sur la gaine (11) ; deux chambres (21, 22) isolées l'une de l'autre sont également formées dans le corps de type boîte : une première chambre (21) est connectée directement à l'orifice d'admission (17) et une deuxième chambre (22) est connectée directement à l'orifice de distribution (18).
PCT/EP2006/064623 2005-07-29 2006-07-25 Pompe hydraulique WO2007014876A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06792562A EP1910684A1 (fr) 2005-07-29 2006-07-25 Pompe hydraulique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2005A000240 2005-07-29
IT000240A ITPD20050240A1 (it) 2005-07-29 2005-07-29 Struttura di pompa idraulica

Publications (1)

Publication Number Publication Date
WO2007014876A1 true WO2007014876A1 (fr) 2007-02-08

Family

ID=37198622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/064623 WO2007014876A1 (fr) 2005-07-29 2006-07-25 Pompe hydraulique

Country Status (3)

Country Link
EP (1) EP1910684A1 (fr)
IT (1) ITPD20050240A1 (fr)
WO (1) WO2007014876A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013060395A1 (fr) * 2011-10-25 2013-05-02 Wilo Se Pompe centrifuge multi-étagée
GB2506722A (en) * 2012-07-06 2014-04-09 Salamander Pumped Shower Systems Ltd Pump assembly with collinear inlet and outlet
CN104613013A (zh) * 2015-01-21 2015-05-13 湖州南丰机械制造有限公司 一种泵的进出水段结构
CN104613015A (zh) * 2015-01-24 2015-05-13 湖州南丰机械制造有限公司 一种带有出水体的水泵泵头
CN107567546A (zh) * 2015-04-29 2018-01-09 保时捷股份公司 具有多个可调整的排出开口的泵

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2277256A1 (fr) * 1974-07-03 1976-01-30 Sulzer Ag Pompe centrifuge a etages multiples
FR2466647A1 (fr) * 1979-10-03 1981-04-10 Klein Schanzlin & Becker Ag Pompe centrifuge pour fortes pressions
GB2073819A (en) * 1980-04-15 1981-10-21 Schweinfurter F Lateral channel pump
DE4011475A1 (de) * 1990-04-09 1991-10-10 Klein Schanzlin & Becker Ag Topfgehaeuse
WO1993011360A1 (fr) * 1991-12-05 1993-06-10 Nocchi Pompe S.P.A. Pompe centrifuge pourvue d'un adaptateur pour differentes soupapes
DE4415157A1 (de) * 1994-05-02 1995-11-09 Klein Schanzlin & Becker Ag Selbstansaugende mehrstufige Kreiselpumpe
EP0907029A2 (fr) * 1997-10-04 1999-04-07 Grundfos A/S Ensemble de pompe centrifuge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2277256A1 (fr) * 1974-07-03 1976-01-30 Sulzer Ag Pompe centrifuge a etages multiples
FR2466647A1 (fr) * 1979-10-03 1981-04-10 Klein Schanzlin & Becker Ag Pompe centrifuge pour fortes pressions
GB2073819A (en) * 1980-04-15 1981-10-21 Schweinfurter F Lateral channel pump
DE4011475A1 (de) * 1990-04-09 1991-10-10 Klein Schanzlin & Becker Ag Topfgehaeuse
WO1993011360A1 (fr) * 1991-12-05 1993-06-10 Nocchi Pompe S.P.A. Pompe centrifuge pourvue d'un adaptateur pour differentes soupapes
DE4415157A1 (de) * 1994-05-02 1995-11-09 Klein Schanzlin & Becker Ag Selbstansaugende mehrstufige Kreiselpumpe
EP0907029A2 (fr) * 1997-10-04 1999-04-07 Grundfos A/S Ensemble de pompe centrifuge

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013060395A1 (fr) * 2011-10-25 2013-05-02 Wilo Se Pompe centrifuge multi-étagée
GB2506722A (en) * 2012-07-06 2014-04-09 Salamander Pumped Shower Systems Ltd Pump assembly with collinear inlet and outlet
CN104613013A (zh) * 2015-01-21 2015-05-13 湖州南丰机械制造有限公司 一种泵的进出水段结构
CN104613015A (zh) * 2015-01-24 2015-05-13 湖州南丰机械制造有限公司 一种带有出水体的水泵泵头
CN107567546A (zh) * 2015-04-29 2018-01-09 保时捷股份公司 具有多个可调整的排出开口的泵

Also Published As

Publication number Publication date
ITPD20050240A1 (it) 2007-01-30
EP1910684A1 (fr) 2008-04-16

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