WO2006027331A1 - Volute for a centrifugal pump - Google Patents

Volute for a centrifugal pump Download PDF

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Publication number
WO2006027331A1
WO2006027331A1 PCT/EP2005/054279 EP2005054279W WO2006027331A1 WO 2006027331 A1 WO2006027331 A1 WO 2006027331A1 EP 2005054279 W EP2005054279 W EP 2005054279W WO 2006027331 A1 WO2006027331 A1 WO 2006027331A1
Authority
WO
WIPO (PCT)
Prior art keywords
volute
impeller
intake duct
liquid flow
resistive element
Prior art date
Application number
PCT/EP2005/054279
Other languages
French (fr)
Inventor
Nathaniel Mulcahy
Original Assignee
Emerson Appliance Motors Europe S.R.L.
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 Emerson Appliance Motors Europe S.R.L. filed Critical Emerson Appliance Motors Europe S.R.L.
Publication of WO2006027331A1 publication Critical patent/WO2006027331A1/en

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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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • 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
    • F04D29/40—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 heating members arranged inside the volute allow the formation of a plurality of layers of liquid, in particular water, inside the hollow body, having a different temperature and density, and provide the movement of the liquid from the intake duct towards the delivery duct with a spinning (or helical) component.
  • Figure 1 is an exploded view of a first embodiment of the volute according to the invention
  • Figure 2 is a cross-sectional view of the intake duct of the volute shown in Figure 1, along the line II-II;
  • Figure 2a is a variation of embodiment of the intake duct shown in Figure 2;
  • Figure 4 is a schematic illustration of a particular spatial arrangement of thick-film heating devices inside the volute
  • Figure 7 is an exploded view, partly cross-sectioned, similar to Figure 6, of a volute which has thick-film heating devices inside its hollow body;
  • Figure 8 is a transversely sectioned view of a further embodiment of a volute according to the invention.
  • 10 denotes generally a rotary hydraulic pump of the centrifugal type, in particular for electric household appliances and the like, comprising a volute 12, an impeller 14, a bottom closing element 16 and an electric motor (not shown) .
  • the volute 12 which is for example made of plastic or aluminium or alloys thereof, comprises a hollow body 18 having an axial intake duct 20 and a tangential delivery duct 22.
  • the pump 10 draws a liquid flow from the intake duct 20 into the hollow body 18 as a result of rotation of the impeller 14 actuated by the electric motor.
  • the liquid arriving from the intake duct 20 is pushed by the effect of the centrifugal force towards the periphery of the hollow body 18 and is directed towards the delivery duct 22.
  • the heating members may be inserted inside the intake duct 20 and/or inside the hollow body 18.
  • cross-section of the sheath 30 has been shown with a circular form, but it may equally well be square or triangular or have any prismatic cross-section.
  • the spiral-shaped element 26 may be fixed, for example welded or glued, to a support base-piece made of metallic or thermoplastic material, in turn fixed to the duct 20.
  • the resistive element 26 has terminal sections 28 which pass (in a fluid-tight manner) through the wall of the duct 20 and emerge outside the latter so that they may be connected to an electric power supply and control circuit (not shown) . In this way, during operation the water flowing into the intake duct 20 in the direction of the hollow body 18 is heated by the heat generated by the resistive element 26 owing to the Joule effect.
  • the spiral-shaped resistive element 26 has an inclination ⁇ and a pitch L which are predefined so as to provide the liquid entering the hollow body 18 with an angular velocity component in the same direction as the rotational velocity A of the impeller 14. This condition, combined with heating of the liquid, allows a partial reduction in the turbulence affecting the liquid flow from the intake duct 20, thus allowing an increase in the delivery and a consequent decrease in the risk of cavitation.
  • the internal wall of the intake duct 20 is shown with a threaded profile 32 projecting internally.
  • the heating device 34 which is of a type known per se, comprises a substantially plate-like support 36 with a main surface 38 and a superficial resistive element 40 deposited using the thick-film technique.
  • the plate-like support 36 may be made, for example, of ceramic material.
  • the thick-film resistor 40 is connected to insulated conductors 42 which allow heating thereof due to the passage of current and which, in their connection portions, are electrically insulated and waterproofed with a layer of synthetic resin 44.
  • a plurality of thick-film resistive heating elements of the type according to Figure 3, or the like, is conveniently arranged inside the intake duct 20 and/or inside the hollow body 18 of a volute 12, for example according to one of the arrangements which will now be described.
  • the deflecting surfaces 38 of the heating devices 34 lie in planes which are substantially parallel to radial directions transverse to the axis B-B and form an angle ⁇ with respect to the flow lines C, in particular directed towards the rear with respect to the direction of rotation A of the impeller 14.
  • Figure 5 is a variation of Figure 4 in which the deflecting surfaces 38 lie in planes intersecting radial directions transverse to the axis B-B. Therefore, the surfaces 38, in addition to having an inclination of angle ⁇ towards the rear, with respect to the direction of rotation A, are also rotated through an angle ⁇ with respect to the transverse radial directions passing through the bottom vertex of their radially outer side.
  • the deflecting surfaces 38 are able to deviate at least one portion of the liquid flow C such that the deviated flow has a velocity component in the same direction as the rotational velocity of the impeller 14. In this way, a spinning movement is imparted to the liquid coinciding with the direction of rotation A of the impeller 14, this helping achieve a reduction in the cavitation phenomena and an increase in the delivery of the pump 10.
  • Figure 6 shows a volute 12 comprising four heating devices 34 arranged inside the intake duct 20 and oriented as shown in Figure 4.
  • the heating devices 34 may be arranged both inside the intake duct 20 and inside the hollow body 18.
  • the use of a spiral-shaped resistive element 26 situated inside the intake duct 20 may be combined with the use of the heating devices 34 inside the hollow body 18.
  • Figures 8 and 9 show a partial variation of embodiment of a volute 12 according to the invention.
  • a plurality of fixed deflector vanes 46 which are angularly spaced, extends from the internal surface of the hollow body 18 of the volute 12.
  • These vanes 46 are preferably planar and moulded as one piece with the hollow body 18 of the volute 12; moreover, each fixed vane 46 lies in a plane which is substantially tangential to the distal end of a vane 24 of the impeller 14 when this vane 24 of the impeller 14 is situated at a minimum distance from the free end of the fixed vane 46.
  • This condition occurs simultaneously for all the fixed vanes 46 of the volute 12 according to Figure 8.

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

Abstract

The volute (12) for a pump (10) of the centrifugal type comprises a hollow body (18) having an axial intake duct (20) and a tangential delivery duct (22), for entry and exit of a liquid flow (C) respectively. The volute (12) also comprises associated electric heating members (26; 34) able to heat the liquid flow (C) between the intake duct (20) and the delivery duct (22). The heating members (26; 34) are shaped and arranged so that they are able to impart during operation a spinning movement to the liquid flow (C) about the axis (B-B) of the intake duct (20) and the impeller (14) of the pump (10), in the same direction as the rotation (A), imparted to the liquid flow by the impeller (14).

Description

Volute for a centrifugal pump
The present invention relates to a volute for a rotary hydraulic pump of the centrifugal type, comprising a hollow body having an axial intake duct and a tangential delivery duct, for the entry and exit of a liquid flow respectively, and associated electric heating means able to heat the liquid flow which flows during operation between the intake duct and the delivery duct.
In rotary hydraulic pumps of the centrifugal type, the problem of cavitation, i.e. the formation of air bubbles mixed with the liquid which flows from the intake duct to the delivery duct, is known. This phenomenon may cause the wear and corrosion of the impeller and alteration of the liquid flow, resulting in the formation of turbulent currents which adversely affect the delivery of the pump.
One object of the present invention is to propose an improved volute which improves the efficiency of the pump with which it is associated, resulting in a greater delivery together with a reduction in the risks of cavitation for the abovementioned pump.
These and other objects are achieved according to the invention by means of a volute for a centrifugal pump in which the heating means are shaped and arranged so that they are able to impart during operation a spinning movement to said liquid flow about the axis of the intake duct and the pump impeller, in the same direction as the rotation imparted to the liquid flow by the impeller.
Owing to these characteristics, the heating members arranged inside the volute allow the formation of a plurality of layers of liquid, in particular water, inside the hollow body, having a different temperature and density, and provide the movement of the liquid from the intake duct towards the delivery duct with a spinning (or helical) component.
In this condition, the vortical and turbulent flows of the liquid inside the volute, which contribute towards the phenomenon of cavitation, are reduced and at the same time the delivery of the pump is improved.
Further characteristic features and advantages of the invention will emerge from the detailed description which follows, provided purely by way of a non-limiting example with reference to the accompanying drawings in which:
Figure 1 is an exploded view of a first embodiment of the volute according to the invention;
Figure 2 is a cross-sectional view of the intake duct of the volute shown in Figure 1, along the line II-II;
Figure 2a is a variation of embodiment of the intake duct shown in Figure 2;
Figure 3 shows a three-dimensional view of a thick-film heating device of another embodiment of the volute;
Figure 4 is a schematic illustration of a particular spatial arrangement of thick-film heating devices inside the volute;
Figure 5 is a schematic illustration of a further arrangement similar to that of Figure 4;
Figure 6 is an exploded view of an embodiment of the volute incorporating thick-film heating devices inside the intake duct;
Figure 7 is an exploded view, partly cross-sectioned, similar to Figure 6, of a volute which has thick-film heating devices inside its hollow body;
Figure 8 is a transversely sectioned view of a further embodiment of a volute according to the invention; and
Figure 9 is a cross-sectional view along the line IX-IX of the volute according to Figure 8.
With reference in particular to Figure 1, 10 denotes generally a rotary hydraulic pump of the centrifugal type, in particular for electric household appliances and the like, comprising a volute 12, an impeller 14, a bottom closing element 16 and an electric motor (not shown) .
The impeller 14 is provided with vanes 24 and is intended to be connected to the shaft of the electric motor (details not shown) so as to be actuated in a direction of rotation indicated by A. The impeller 14 is housed inside the volute 12 which is joined by means of snap-engagement to the closing element 16 so as to ensure a liquid-tight seal.
The volute 12, which is for example made of plastic or aluminium or alloys thereof, comprises a hollow body 18 having an axial intake duct 20 and a tangential delivery duct 22.
During operation, the pump 10 draws a liquid flow from the intake duct 20 into the hollow body 18 as a result of rotation of the impeller 14 actuated by the electric motor. The liquid arriving from the intake duct 20 is pushed by the effect of the centrifugal force towards the periphery of the hollow body 18 and is directed towards the delivery duct 22.
The volute 12 comprises furthermore heating members, intended to heat the liquid flowing from the intake duct 20 to the delivery duct 22. Different embodiments are envisaged for these heating members and will be illustrated below, said embodiments having in common the fact that these heating members are shaped so as to impart, during operation of the pump 10, a spinning movement to the liquid flow about the axis B-B of the intake duct 20 and the impeller 14, in the same direction A as the rotation imparted to the liquid flow by the impeller 14 of the pump.
As will be clarified in the remainder of the description, in some embodiments the heating members may be inserted inside the intake duct 20 and/or inside the hollow body 18.
In the embodiment according to Figure 1, the heating members comprise at least one spiral-shaped resistive element 26 fixed inside the intake duct 20. This resistive element has conveniently an impermeable sheath 30, in particular a metal casing, which ensures insulation thereof with respect to the pumped liquid (Figure 2) . Alternatively, the sheath 30 may be made of thermoplastic material or may consist of a layer of resin which surrounds the resistive element 26.
In Figures 1 and 2, by way of example, the cross-section of the sheath 30 has been shown with a circular form, but it may equally well be square or triangular or have any prismatic cross-section.
In variations of embodiment not shown, the spiral-shaped element 26 may be fixed, for example welded or glued, to a support base-piece made of metallic or thermoplastic material, in turn fixed to the duct 20.
The resistive element 26 has terminal sections 28 which pass (in a fluid-tight manner) through the wall of the duct 20 and emerge outside the latter so that they may be connected to an electric power supply and control circuit (not shown) . In this way, during operation the water flowing into the intake duct 20 in the direction of the hollow body 18 is heated by the heat generated by the resistive element 26 owing to the Joule effect.
With reference in particular to Figure 2, it can be noted that the spiral-shaped resistive element 26 has an inclination α and a pitch L which are predefined so as to provide the liquid entering the hollow body 18 with an angular velocity component in the same direction as the rotational velocity A of the impeller 14. This condition, combined with heating of the liquid, allows a partial reduction in the turbulence affecting the liquid flow from the intake duct 20, thus allowing an increase in the delivery and a consequent decrease in the risk of cavitation.
The variation of application shown in Figure 2a exhibits a spiral-shaped element 26 produced by means of co-moulding together with the intake duct 20 made of thermoplastic material. In this case, the sheath 30 may not be envisaged.
Purely by way of example of the multiplicity of variations of application which may be obtained by means of co-moulding, the internal wall of the intake duct 20 is shown with a threaded profile 32 projecting internally.
With reference to Figure 3, this shows a heating device 34 used in another embodiment of the invention. The heating device 34, which is of a type known per se, comprises a substantially plate-like support 36 with a main surface 38 and a superficial resistive element 40 deposited using the thick-film technique. The plate-like support 36 may be made, for example, of ceramic material. The thick-film resistor 40 is connected to insulated conductors 42 which allow heating thereof due to the passage of current and which, in their connection portions, are electrically insulated and waterproofed with a layer of synthetic resin 44.
A plurality of thick-film resistive heating elements of the type according to Figure 3, or the like, is conveniently arranged inside the intake duct 20 and/or inside the hollow body 18 of a volute 12, for example according to one of the arrangements which will now be described.
Figures 4 and 5 are schematic illustrations of spatial arrangements which these heating devices 34 may assume inside the intake duct 20 or inside the hollow body 18 or simultaneously inside both of them. In both the arrangements shown, the heating devices 34 are angularly spaced from each other uniformly about the axis B-B and have preferably the same inclination relative to the direction of entry or incidence of the liquid, indicated by the arrows C.
In Figure 4 the deflecting surfaces 38 of the heating devices 34 lie in planes which are substantially parallel to radial directions transverse to the axis B-B and form an angle β with respect to the flow lines C, in particular directed towards the rear with respect to the direction of rotation A of the impeller 14.
Figure 5 is a variation of Figure 4 in which the deflecting surfaces 38 lie in planes intersecting radial directions transverse to the axis B-B. Therefore, the surfaces 38, in addition to having an inclination of angle δ towards the rear, with respect to the direction of rotation A, are also rotated through an angle γ with respect to the transverse radial directions passing through the bottom vertex of their radially outer side.
The arrangements described above are such that the deflecting surfaces 38 are able to deviate at least one portion of the liquid flow C such that the deviated flow has a velocity component in the same direction as the rotational velocity of the impeller 14. In this way, a spinning movement is imparted to the liquid coinciding with the direction of rotation A of the impeller 14, this helping achieve a reduction in the cavitation phenomena and an increase in the delivery of the pump 10.
Figure 6 shows a volute 12 comprising four heating devices 34 arranged inside the intake duct 20 and oriented as shown in Figure 4.
Figure 7 shows a volute 12 comprising four heating devices 34 arranged inside the hollow body 18. In this variation of embodiment, the deflecting surfaces 38 of the heating devices 34 have, on the side directed towards the impeller 14, a profile shaped in a manner substantially complementing the profile of the latter.
In embodiments not shown, the heating devices 34 may be arranged both inside the intake duct 20 and inside the hollow body 18.
In further embodiments not shown, the use of a spiral-shaped resistive element 26 situated inside the intake duct 20 may be combined with the use of the heating devices 34 inside the hollow body 18.
It is therefore also possible to combine an arrangement of heating elements 34 inside the intake duct 20 with the arrangement of a spiral-shaped heating element 26 inside the hollow body 18 of the volute 12.
Figures 8 and 9 show a partial variation of embodiment of a volute 12 according to the invention.
In this variation, a plurality of fixed deflector vanes 46 which are angularly spaced, extends from the internal surface of the hollow body 18 of the volute 12. These vanes 46 are preferably planar and moulded as one piece with the hollow body 18 of the volute 12; moreover, each fixed vane 46 lies in a plane which is substantially tangential to the distal end of a vane 24 of the impeller 14 when this vane 24 of the impeller 14 is situated at a minimum distance from the free end of the fixed vane 46. This condition occurs simultaneously for all the fixed vanes 46 of the volute 12 according to Figure 8. Moreover, it is also possible to adopt other arrangements of fixed vanes 46 so that, at a certain instant, the abovementioned condition occurs only for a subset of said fixed vanes 46.
The solution described above with reference to Figures 8 and 9 helps effectively reduce the risks of cavitation and may be adopted in combination with heating means of the types previously described with reference to Figures 1 to 7.
Obviously, without modifying the principle of the invention, the embodiments and the constructional details may be widely varied with respect to that described and illustrated purely by way of a non-limiting example, without thereby departing from the scope of invention as defined in the accompanying claims.

Claims

1. Volute (12) for a rotary hydraulic pump (10) of the centrifugal type, comprising a hollow body (18) having an axial intake duct (20) and a tangential delivery duct (22) , for entry and exit of a liquid flow (C) respectively, and associated electric heating means (26; 34) able to heat the liquid flow (C) which flows during operation between the intake duct (20) and the delivery duct (22); characterized in that said heating means (26; 34) are shaped and arranged so that they are able to impart during operation a spinning movement to said liquid flow (C) about the axis (B-B) of the intake duct (20) and the impeller (14) of the pump (10) , in the same direction as the rotation (A) imparted to the liquid flow by the impeller (14) .
2. Volute (12) according to Claim 1, in which the heating means (26; 34) are fixed inside the intake duct (20) of the volute (12) .
3. Volute (12) according to Claim 1 or 2, in which the heating means (34) are fixed inside the hollow body (18) of the volute (12) .
4. Volute (12) according to Claim 2 or 3, in which the heating means comprise at least one spiral-shaped resistive element (26) having a predefined inclination (α) and pitch
(L) .
5. Volute (12) according to Claim 4, at least partly made of thermoplastic material and in which the resistive element (26) is co-moulded therewith.
6. Volute (12) according to Claim 4 or 5, in which the resistive element (26) comprises a waterproofing sheath (30) .
7. Volute (12) according to Claim 6, in which the waterproofing sheath (30) comprises a metal or thermoplastic casing which encloses the resistive element (26) in a liquid- tight manner.
8. Volute (12) according to Claim 6, in which the waterproofing sheath (30) comprises a layer of resin inside which the resistive element (26) is embedded.
9. Volute (12) according to Claim 6, 7 or 8, in which the waterproofing sheath (30) has a substantially prismatic cross-section.
10. Volute (12) according to any one of Claims 4 to 9, in which the resistive element (26) is fixed to a plate-like support element made of metallic or thermoplastic material.
11. Volute (12) according to any one of the preceding claims, in which the heating means comprise a plurality of heating devices (34) including respective plate-like supports
(36) having a deflecting surface (38) able to deviate, in a direction having a component in the same direction as the rotational velocity (A) of the impeller (14) , a portion of the liquid flow (C) which passes through the volute (12) ; said deviating surface (38) having respective thick-film surface resistive elements (40) .
12. Volute (12) according to Claim 11, in which the heating devices (34) are angularly spaced from each other in a uniform manner.
13. Volute (12) according to Claim 11 or 12, in which the deflecting surfaces (38) of the heating devices (34) lie in planes substantially parallel to radial directions transverse to the axis (B-B) of the impeller (14) .
14. Volute (12) according to Claim 11 or 12, in which the deflecting surfaces (38) of the heating devices (34) lie in planes intersecting radial directions transverse to the axis (B-B) of the impeller (14) .
15. Volute (12) according to Claim 13 or 14, in which the deflecting surfaces (38) are inclined towards the rear with respect to the direction of rotation (A) of the impeller (14) .
16. Volute (12) according to any one of Claims 11 to 15 when dependent upon Claim 3, in which the deflecting surfaces (38) of the heating devices (34) have on the side directed towards the impeller (14) a profile shaped in a manner substantially complementing the profile of said impeller (14) .
17. Volute (12) according to any one of the preceding claims, in which a plurality of fixed deflecting vanes (46) , which are substantially planar, extends inside the hollow body (18) , each fixed vane (46) lying in a plane which is substantially tangential to the distal end of a vane (24) of the impeller (14) when said vane (24) of the impeller (14) is situated at a minimum distance from the free end of the fixed vane (46) .
18. Rotary hydraulic pump (10) of the centrifugal or tangential type, in particular for electric household appliances such as washing machines, dish washers or the like, comprising a volute (12) according to any one of the preceding claims.
PCT/EP2005/054279 2004-09-08 2005-08-31 Volute for a centrifugal pump WO2006027331A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2004A000592 2004-09-08
IT000592A ITTO20040592A1 (en) 2004-09-08 2004-09-08 SNAIL FOR A CENTRIFUGAL PUMP

Publications (1)

Publication Number Publication Date
WO2006027331A1 true WO2006027331A1 (en) 2006-03-16

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IT (1) ITTO20040592A1 (en)
WO (1) WO2006027331A1 (en)

Cited By (15)

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WO2006136819A2 (en) * 2005-06-23 2006-12-28 Otter Controls Ltd Combined heater pump apparatus
EP1870508A2 (en) * 2006-06-21 2007-12-26 AWECO APPLIANCE SYSTEMS GmbH & Co. KG Pump, in particular for household machine using water.
DE102007017271A1 (en) * 2007-04-12 2008-10-16 BSH Bosch und Siemens Hausgeräte GmbH Pump with heating device
DE102008050895A1 (en) * 2008-09-25 2010-04-01 E.G.O. Elektro-Gerätebau GmbH Pump for fluids
DE102011003464A1 (en) * 2011-02-01 2012-04-26 E.G.O. Elektro-Gerätebau GmbH Tubular heating device for use as aquiferous region of pumping chamber of e.g. radial flow pump for dishwasher, has pipe-shaped carrier whose natural oscillation behavior and natural frequency are changed by continuous deformation
DE102012210554A1 (en) * 2012-06-22 2013-12-24 E.G.O. Elektro-Gerätebau GmbH pump
DE102012218145A1 (en) * 2012-10-04 2014-04-24 E.G.O. Elektro-Gerätebau GmbH Impeller pump for conveying water, has heating device directly arranged at or in path of medium at outlet of medium from impeller such that heating device is directly attached to exit and at impeller and/or extends in direction of medium
ES2460369A1 (en) * 2012-11-12 2014-05-13 Coprecitec, S.L. Fluid circulation pump adapted for a household appliance
DE102013202346B3 (en) * 2013-02-13 2014-05-28 E.G.O. Elektro-Gerätebau GmbH Impeller pump for conveying medium, has cutout provided in lateral wall of pump chamber, and heating element located along entire edge of cut sealing, where heating element is arranged in path of conveyed medium from impeller to outlet
EP2495444B1 (en) 2011-03-04 2015-07-01 E.G.O. ELEKTRO-GERÄTEBAU GmbH Pump
US9145901B2 (en) 2011-04-15 2015-09-29 Johnson Electric S.A. Heating pump
WO2017101086A1 (en) * 2015-12-17 2017-06-22 广东威灵电机制造有限公司 Centrifugal pump
CN112648192A (en) * 2019-10-12 2021-04-13 广东美的白色家电技术创新中心有限公司 Heating pump and cleaning device
DE102012025758B3 (en) 2012-10-04 2021-12-02 E.G.O. Elektro-Gerätebau GmbH Impeller pump
EP3134653B1 (en) * 2014-04-24 2024-03-06 Foshan Shunde Midea Washing Appliances Mfg. Co., Ltd. Heat pump and dishwasher comprising the same

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US20010042560A1 (en) * 1998-12-16 2001-11-22 Wolfgang Steck Heater for heating the dishwashing liquid in a dishwasher
US20020048513A1 (en) * 2000-10-25 2002-04-25 Martin Kleemann Pump with a heatable housing
DE10324626A1 (en) * 2002-05-29 2004-03-04 Aweco Appliance Systems Gmbh & Co. Kg Heater mounted externally on domestic washing machine pump, has element contacting pump casing profile over half or more of its area

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DE19852569A1 (en) * 1998-11-13 2000-05-18 Miele & Cie Circulation pump, in particular for water-bearing household appliances
US20010042560A1 (en) * 1998-12-16 2001-11-22 Wolfgang Steck Heater for heating the dishwashing liquid in a dishwasher
US20020048513A1 (en) * 2000-10-25 2002-04-25 Martin Kleemann Pump with a heatable housing
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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006136819A3 (en) * 2005-06-23 2007-06-14 Otter Controls Ltd Combined heater pump apparatus
WO2006136819A2 (en) * 2005-06-23 2006-12-28 Otter Controls Ltd Combined heater pump apparatus
GB2427437B (en) * 2005-06-23 2010-11-10 Otter Controls Ltd Combined heater pump apparatus
EP1870508A2 (en) * 2006-06-21 2007-12-26 AWECO APPLIANCE SYSTEMS GmbH & Co. KG Pump, in particular for household machine using water.
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