EP1855013A2 - Amélioration de chambre de pompage dans une pompe à turbine centrifuge - Google Patents

Amélioration de chambre de pompage dans une pompe à turbine centrifuge Download PDF

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Publication number
EP1855013A2
EP1855013A2 EP07107006A EP07107006A EP1855013A2 EP 1855013 A2 EP1855013 A2 EP 1855013A2 EP 07107006 A EP07107006 A EP 07107006A EP 07107006 A EP07107006 A EP 07107006A EP 1855013 A2 EP1855013 A2 EP 1855013A2
Authority
EP
European Patent Office
Prior art keywords
pumping chamber
intake conduit
impeller
turbine pump
centrifugal turbine
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Withdrawn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
EP07107006A
Other languages
German (de)
English (en)
Other versions
EP1855013A3 (fr
Inventor
Fabrizio Sandron
Sergio Bonacina
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.)
Nidec Sole Motor Corp SRL
Original Assignee
Appliances Components Cos 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 Appliances Components Cos SpA filed Critical Appliances Components Cos SpA
Publication of EP1855013A2 publication Critical patent/EP1855013A2/fr
Publication of EP1855013A3 publication Critical patent/EP1855013A3/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Withdrawn legal-status Critical Current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
    • F04D29/40—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
    • F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes

Definitions

  • the present invention relates to an improved kind of centrifugal turbine pump, preferably of the type generally used in connection with electrical home appliances, such as clothes washing machines, dishwashers, and the like, and provided therefore with such design and operating specifications as generally required in view of such applications.
  • the present invention relates to the pumping chamber and the rotating vanes of the impeller of such pumps.
  • pumps of the above-cited kind are generally used in appliances and machines that are required to be very competitive as far as both costs and energy efficiency are concerned, a considerable, constant effort is most obviously being made in industry by manufacturing and design engineers in an attempt to continuously improve the overall operating and construction characteristics of such pumps.
  • the gap between the body of the pumping chamber - on the side of the intake conduit - and the corresponding edges of the vanes has a rather considerable width, so that a vortex is able to form thereinside, which does not take part in, i.e. contribute to the pumping action, but uses anyway energy and, therefore, contributes to a deterioration of the overall efficiency of the pump; in addition, the presence of the core part of the pump, which is provided to act as a hub, and which is however situated exactly in front of the outflow port of the intake conduit, turns out as acting almost as a "plug" that partially obstructs the inflow of the liquor into the pumping chamber.
  • FIG. 1 With reference to Figure 1, there is illustrated a first embodiment of the invention, which comprises an intake conduit 1, a pumping chamber 3 and, housed thereinside, an impeller with related vanes 5.
  • the end portion 6 of said intake conduit is not cylindrical, as it usually occurs, but is slightly flaring upwards, i.e. narrowing conically towards the inflow end into the pumping chamber, as indicated at 16 in Figure 1. It has in fact been found that such slight reduction in the inflow section of the conduit into the pumping chamber, far from producing a reduction in the flow rate, is rather effective in improving the linearity of the flow lines of the liquor being let into the chamber, since a contraction in the cross-section of a conduit, through which there flows a fluid, generally tends to reduce the vorticity of the fluid flow and, as a result, also improves - albeit slightly - the flow rate.
  • the edge 10 of such vane that is disposed to face the zone where said intake conduit 1 couples to, i.e. flows into the pumping chamber 3 comprises in fact a portion 7 which is shaped so as to form a corner with an angle A that is substantially oriented in a direction towards said intake conduit, or preferentially towards the transition region 8 between said intake conduit and said pumping chamber.
  • FIG. 4 A further advantageous embodiment of the present invention is illustrated in Figure 4, wherein it can be noticed that the above-mentioned transition region - instead of being embodied in the form of a continuous curve following a substantially constant curvature radius - is given an "accordion-like" pleated contour with two opposite angles, so that the section passing through the axis X of the impeller shows a sawtooth-like profile, i.e. a profile resembling the teeth of a saw.
  • Such transition region has two opposite circular edges 30 and 31 extending concentrically with said axis X, wherein the edge 30 lying closer to the axis X is also the innermost edge relative to the pumping chamber and, as a result, the edge that lies also closer to the body of the respective impeller.
  • annular recessing portion 32 is formed between said two edges 30 and 31, which is delimited towards said axis X by the side 33 joining said two edges 30 and 31 with each other.
  • said corner-shaped portion 7 featuring an angle A is appropriately sized and proportioned so that, when the impeller is duly assembled, such portion is able to fit into said annular recessing portion 32 and, preferably, said angle A is capable of fitting in a wedge-like manner into the innermost region of said annular recessing portion 32.
  • a still further improved embodiment of the present invention may be again be provided as follows: referring again to Figures 2 and 4, the inner side 11 of said edges 10 of the respective vanes is disposed so as to be substantially oriented towards the core portion of the impeller, i.e. in a direction inclining at an acute angle H relative to said axis X; the actual purpose of this improvement lies in the fact that any form whatsoever of resistance or hindrance to the movement of the inflow of fluid entering the pumping chamber is thereby effectively prevented from occurring, and therefore, if the core portion of the vanes is set back to some extent, the vanes themselves are effectively prevented from simply and just centrifuging the inflowing fluid, i.e. accelerating it by the sole centrifugal force, before delivering it to the outermost, i.e. side portions of the vanes for it to be propelled by turbine effect towards the delivery or discharge conduit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP07107006.4A 2006-05-12 2007-04-26 Amélioration de chambre de pompage dans une pompe à turbine centrifuge Withdrawn EP1855013A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPN20060038 ITPN20060038A1 (it) 2006-05-12 2006-05-12 "turbo-pompa centrifuga con cassa di pompaggio perfezionata"

Publications (2)

Publication Number Publication Date
EP1855013A2 true EP1855013A2 (fr) 2007-11-14
EP1855013A3 EP1855013A3 (fr) 2013-10-23

Family

ID=38283110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07107006.4A Withdrawn EP1855013A3 (fr) 2006-05-12 2007-04-26 Amélioration de chambre de pompage dans une pompe à turbine centrifuge

Country Status (2)

Country Link
EP (1) EP1855013A3 (fr)
IT (1) ITPN20060038A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015099526A1 (fr) * 2013-12-24 2015-07-02 Flowserve B.V. Carter pour pompe, et pompe dotée d'un carter
USD829770S1 (en) 2015-08-20 2018-10-02 Sulzer Management Ag Volute casing for a pump
CN113530875A (zh) * 2021-07-13 2021-10-22 清华大学 一种采用环形叶片的喘振抑制装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR786795A (fr) * 1935-03-08 1935-09-09 Diebold & Cie Dispositif pour diminuer les fuites intérieures et l'usure dans les pompes centrifuges et les turbines traversées par des liquides boueux
US3620642A (en) * 1969-12-09 1971-11-16 Wilfley & Sons Inc A Centrifugal pump
FI750217A7 (fr) * 1975-01-28 1976-07-30 Sarlin Ab Oy E
US4269564A (en) * 1978-10-02 1981-05-26 Bank Of America N.T. & S.A. Flow control device
JPS57124098A (en) * 1981-01-23 1982-08-02 Ebara Corp Pump
US4900222A (en) * 1988-12-23 1990-02-13 Rockwell International Corporation Rotary pump inlet velocity profile control device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015099526A1 (fr) * 2013-12-24 2015-07-02 Flowserve B.V. Carter pour pompe, et pompe dotée d'un carter
USD829770S1 (en) 2015-08-20 2018-10-02 Sulzer Management Ag Volute casing for a pump
USD921050S1 (en) 2015-08-20 2021-06-01 Sulzer Management Ag Portion of volute casing for a pump
USD926820S1 (en) 2015-08-20 2021-08-03 Sulzer Management Ag Portion of volute casing for a pump
USD939584S1 (en) 2015-08-20 2021-12-28 Sulzer Management Ag Volute casing for a pump
USD947249S1 (en) 2015-08-20 2022-03-29 Sulzer Management Ag Volute casing for a pump
USD947250S1 (en) 2015-08-20 2022-03-29 Sulzer Management Ag Volute casing for a pump
USD947248S1 (en) 2015-08-20 2022-03-29 Sulzer Management Ag Volute casing for a pump
CN113530875A (zh) * 2021-07-13 2021-10-22 清华大学 一种采用环形叶片的喘振抑制装置
CN113530875B (zh) * 2021-07-13 2022-08-30 清华大学 一种采用环形叶片的喘振抑制装置

Also Published As

Publication number Publication date
ITPN20060038A1 (it) 2007-11-13
EP1855013A3 (fr) 2013-10-23

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