EP1431584A2 - Pompe électrique à plusieurs étages - Google Patents

Pompe électrique à plusieurs étages Download PDF

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Publication number
EP1431584A2
EP1431584A2 EP03380287A EP03380287A EP1431584A2 EP 1431584 A2 EP1431584 A2 EP 1431584A2 EP 03380287 A EP03380287 A EP 03380287A EP 03380287 A EP03380287 A EP 03380287A EP 1431584 A2 EP1431584 A2 EP 1431584A2
Authority
EP
European Patent Office
Prior art keywords
electric pump
stage
return valve
water outlet
rod
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Withdrawn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
EP03380287A
Other languages
German (de)
English (en)
Other versions
EP1431584A3 (fr
Inventor
Josep Pages Pages
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.)
Bogemar SL
Original Assignee
Bogemar SL
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 Bogemar SL filed Critical Bogemar SL
Publication of EP1431584A2 publication Critical patent/EP1431584A2/fr
Publication of EP1431584A3 publication Critical patent/EP1431584A3/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Withdrawn legal-status Critical Current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
    • 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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • 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
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid

Definitions

  • the object of the invention is a multi-stage electric pump formed from a suction-discharge pump and an electric motor coupled together axially, of those widely used to lift water.
  • Said electric pumps require the installation of operation control elements which essentially comprise a non-return valve, which is used to prevent the emptying of the water pipes below the installation, and a zero or minimum discharge detector which has the purpose of halting the electric pump when the demand for water stops.
  • operation control elements which essentially comprise a non-return valve, which is used to prevent the emptying of the water pipes below the installation, and a zero or minimum discharge detector which has the purpose of halting the electric pump when the demand for water stops.
  • the installation may have a pressure regulator which, amongst other functions, detects a drop in pressure of the mains water system, given by consumer demand, causing the electric pump to start-up.
  • the non-return valve, the zero or minimum discharge detector and the pressure regulator are arranged in an electric pump operation control unit assembled upstream thereof, at a certain distance therefrom.
  • This arrangement of the operation control unit has the main drawback that its assembly in the water pipe requires accessories adapted to the specific case of the application, specifically in accordance with the existing relative position between the control unit and the electric pump, in addition to a relatively long assembly time, all of which makes the cost of the installations more expensive; furthermore, another drawback consists of the control unit not being operative as regards the water pressure inside the electric pump, pressure that under certain working conditions can reach a high level leading to malfunctioning of the electric pump.
  • the multi-stage electric pump object of the invention comprises a multi-stage pump coupled axially to an electric motor, the multi-stage pump being essentially formed from a tubular body which, at the end opposite that of the electric motor, is equipped with a water inlet and a suction chamber and, at the other end beside the electric motor, with a discharge chamber and a water outlet.
  • the multi-stage electric pump according to the invention is characterized in that the water outlet is equipped with a pressure detector and a non-return valve equipped with a zero or minimum discharge detector.
  • Another characteristic of the invention consists of the pressure detector essentially comprising an elastic membrane which, on its outer face, establishes permanent hydraulic communication with the water outlet, a spring which exerts a controllable reaction on the other face of the membrane and a microswitch whose switching off and on is determined by the membrane deformation, produced in accordance with the hydraulic pressure in the water outlet and the load of the spring.
  • the non-return valve comprises a rod arranged axially in relation to the water outlet, capable of axial displacement in both directions through a bracket guide, the rod being equipped with a gasket adapted to rest on a closing seat.
  • the non-return valve is equipped with a spring that permanently tends to place the rod in the closed position.
  • the zero or minimum discharge detector comprises a permanent magnet, which displaces with the non-return valve rod, and a reed relay or a Hall-effect sensor.
  • the aforementioned characteristics of the multi-stage electric pump according to the invention provide an innovative solution to the problems derived from the assembly of an operation control unit external to the electric pump, as well as the problems produced by the absence of pressure control inside the electric pump.
  • the fact that the non-return valve is positioned in the electric pump water outlet and the non-return valve is equipped with a zero or minimum discharge detector permits the control functions of these elements being integrated in the electric pump which, in this way, does not require the assembly of external elements for said purpose; on the other hand, the fact that the electric pump water outlet is equipped with a pressure detector permits avoiding overpressure inside the electric pump.
  • the multi-stage electric pump object of the invention is represented, described as an example of embodiment.
  • the electric pump indicated with reference 1
  • the multi-stage pump 2 comprises a tubular body 4 wherein a plurality of impellers 5 are housed.
  • the tubular body 4 is equipped with a water inlet 6 and a suction chamber 7, while the other end, beside the electric motor 3, is equipped with a discharge chamber 8 and a water outlet 9 to which a water pipe, not represented, can be coupled to feed the consumption points.
  • the water outlet 9 is equipped with a pressure detector 10, arranged in the tubular body 4 of the multi-stage pump 2 and which permanently establishes hydraulic communication thereto, and a non-return valve 11 equipped with a zero or minimum discharge detector 12, all of this as represented in the overall view of Fig. 1.
  • the pressure detector 10 comprises a hollow detector body 13 open at one of its ends and fixed to the electric motor 3; an elastic membrane 14 coupled to the open end of the detector body 13 and which, on its outer face 18, establishes permanent hydraulic communication with the water outlet 9 by an orifice 19; and inside the detector body 13, a piston 15 capable of displacing in both directions which rests on the inner face 20 of the elastic membrane 14, and a spring 16 equipped with a load regulator, not represented, which permanently works by compression, resting one of the ends against the piston 15 and its other end against a spring 16 guide-body 17.
  • a microswitch not represented, is mechanically linked to the piston 15 displacements.
  • the operation of the pressure detector 10 is disclosed below.
  • the outer face 18 of the elastic membrane 14 receives, through the orifice 19, the pressure in the water outlet 9 of the multi-stage pump 2, while the inner face 20 receives the reaction of the spring 16 by the piston 15.
  • the subsequent piston displacement 15 causes the microswitch to be operated which causes the electric motor 3 to start-up.
  • the non-return valve 11 is axially positioned in relation to the water outlet 9 and is essentially formed from a bracket guide 22 and by a rod 21.
  • the bracket guide 22 has a general hollow cylindrical form, open at both ends and it is fixed to the tubular body 4 by a nut 23, the outer end of the bracket guide 22 being equipped with a linear pitch 26 arranged at the intersection of a plurality of radii 30.
  • the rod 21 is essentially formed from a first cylindrical portion 27 adapted to be displaced axially in both directions through the linear pitch 26 of the bracket guide 22, and by a second cylindrical portion 28 coaxial with the first portion 27 and equipped with a gasket 29, adapted to be seated in a closing seat 24 made in the outlet 25 of the discharge chamber 8.
  • Said non-return valve 11 operates as described below.
  • the passage of water though the non-return valve 11, specifically the passage of water through the interradial spaces defined between the radii 30, positions the rod 21 in the open position shown in Fig. 3.
  • the rod 21 slips downwards by gravity until the gasket 29 is seated in the closing seat 24, preventing, in this way, the emptying of the water pipes below the non-return valve 11.
  • the non-return valve 11 can be equipped with a closing spring, not represented, arranged between the radii 30 and the second cylindrical portion 28 of the rod 21, adapted so that it permanently tends to place the rod 21 in the closed position, not represented.
  • the zero or minimum discharge detector 12 on the non-return valve 11 rod 21 comprises a permanent magnet 31 which displaces with the rod 21 and a reed relay or alternatively a Hall-effect sensor, designated with reference 33.
  • the operation of the zero or minimum discharge detector 12 is disclosed below.
  • the permanent magnet 31 displaces with the rod 21, its position in relation to the reed relay or the Hall-effect sensor is determinant of its action thereon; the rod 21 being in the open position shown in Fig. 3, the permanent magnet 31 operating the reed relay or Hall-effect sensor 33 which generates a corresponding electrical signal indicative of the water circulation through the non-return valve, on the other hand, if the rod 21 is in the closed position, the permanent magnet 31 does perform any action on any of said elements which, in turn, generates an electric signal complementary to that of the previous, i.e. indicative that the water is not circulating through the non-return valve 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP03380287A 2002-12-18 2003-12-12 Pompe électrique à plusieurs étages Withdrawn EP1431584A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200203032U ES1053407Y (es) 2002-12-18 2002-12-18 Electrobomba multicelular.
ES200203032 2002-12-18

Publications (2)

Publication Number Publication Date
EP1431584A2 true EP1431584A2 (fr) 2004-06-23
EP1431584A3 EP1431584A3 (fr) 2005-07-27

Family

ID=8502758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03380287A Withdrawn EP1431584A3 (fr) 2002-12-18 2003-12-12 Pompe électrique à plusieurs étages

Country Status (2)

Country Link
EP (1) EP1431584A3 (fr)
ES (1) ES1053407Y (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7946810B2 (en) 2006-10-10 2011-05-24 Grundfos Pumps Corporation Multistage pump assembly
US8172523B2 (en) 2006-10-10 2012-05-08 Grudfos Pumps Corporation Multistage pump assembly having removable cartridge
US9139985B2 (en) 2006-11-08 2015-09-22 Grundfos Pumps Corporation Method and system for controlled release of hot water from a fixture
CN114294236A (zh) * 2022-01-21 2022-04-08 浙江南元泵业有限公司 一种可变扬程节能立式多级离心泵
CN117967579A (zh) * 2024-04-01 2024-05-03 烟台大学 一种集液管外置的高压大扬程泵

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2289891A1 (fr) * 1974-11-04 1976-05-28 Wenderoth P Controleur magnetique d'ecoulement de fluides
EP0528726A1 (fr) * 1991-08-16 1993-02-24 POMPES SALMSON Société Anonyme à directoire dite: Procédé et dispositif de commande d'une installation de pompage et élément modulaire de détection pour une telle installation
EP0664398A1 (fr) * 1994-01-21 1995-07-26 WILO GmbH Pompe centrifuge avec clapet de non-retour
GB2293403A (en) * 1994-09-21 1996-03-27 Esmaco Pte Ltd Variable-speed controlled booster pump for water supply system
US6234759B1 (en) * 1998-07-16 2001-05-22 Ewald Hennel Method for regulating a fluid pressure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2289891A1 (fr) * 1974-11-04 1976-05-28 Wenderoth P Controleur magnetique d'ecoulement de fluides
EP0528726A1 (fr) * 1991-08-16 1993-02-24 POMPES SALMSON Société Anonyme à directoire dite: Procédé et dispositif de commande d'une installation de pompage et élément modulaire de détection pour une telle installation
EP0664398A1 (fr) * 1994-01-21 1995-07-26 WILO GmbH Pompe centrifuge avec clapet de non-retour
GB2293403A (en) * 1994-09-21 1996-03-27 Esmaco Pte Ltd Variable-speed controlled booster pump for water supply system
US6234759B1 (en) * 1998-07-16 2001-05-22 Ewald Hennel Method for regulating a fluid pressure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7946810B2 (en) 2006-10-10 2011-05-24 Grundfos Pumps Corporation Multistage pump assembly
US8172523B2 (en) 2006-10-10 2012-05-08 Grudfos Pumps Corporation Multistage pump assembly having removable cartridge
US9139985B2 (en) 2006-11-08 2015-09-22 Grundfos Pumps Corporation Method and system for controlled release of hot water from a fixture
CN114294236A (zh) * 2022-01-21 2022-04-08 浙江南元泵业有限公司 一种可变扬程节能立式多级离心泵
CN114294236B (zh) * 2022-01-21 2024-01-30 浙江南元泵业有限公司 一种可变扬程节能立式多级离心泵
CN117967579A (zh) * 2024-04-01 2024-05-03 烟台大学 一种集液管外置的高压大扬程泵

Also Published As

Publication number Publication date
ES1053407U (es) 2003-04-01
EP1431584A3 (fr) 2005-07-27
ES1053407Y (es) 2003-07-16

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