EP1573207A1 - Pompe a entrainement electrique - Google Patents

Pompe a entrainement electrique

Info

Publication number
EP1573207A1
EP1573207A1 EP03773684A EP03773684A EP1573207A1 EP 1573207 A1 EP1573207 A1 EP 1573207A1 EP 03773684 A EP03773684 A EP 03773684A EP 03773684 A EP03773684 A EP 03773684A EP 1573207 A1 EP1573207 A1 EP 1573207A1
Authority
EP
European Patent Office
Prior art keywords
impeller
pump
pump according
rotor
shaft
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Withdrawn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
EP03773684A
Other languages
German (de)
English (en)
Inventor
Michal Kalavsky
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1573207A1 publication Critical patent/EP1573207A1/fr
Withdrawn legal-status Critical Current

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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • 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
    • F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic

Definitions

  • the present invention relates to an electrically driven pump with an impeller rotating in a pump chamber.
  • Pumps of this type are used in a large number of fields of application where liquids have to be moved against a low back pressure, such as for circulating washing liquids in dishwashers or washing machines, as cooling water pumps for internal combustion engines, as bilge pumps on ships, etc.
  • a pump for circulating the washing liquid is generally arranged below a washing chamber.
  • the overall height of the washing liquid is generally arranged below a washing chamber.
  • Another disadvantage of the conventional design principle is that the shaft leading to the pump head must be reliably sealed in order to protect the motor from liquid escaping from the pump head.
  • an impeller that is unusually elongated in the axial direction that, with regard to its function in the axial direction, can be divided into two sections, a section that plunges deeply into a part of the pumping chamber that is surrounded by the stator of the electrical machine, and by entering the field there exposed to the stator, acts as a rotor, but has virtually no pumping effect, and a second section which is hardly covered by the field of the stator, but which is located at the level of the inlet and outlet of the pumping chamber and therefore has almost exclusively pumping action.
  • the construction principle mentioned at the outset, according to which the motor and pump head lie side by side in the longitudinal direction of the shaft, is also followed in this conventional pump.
  • the object of the present invention is to provide an electrically driven pump which has a reduced length in the axial direction compared to conventional pumps with the same pumping power and is therefore better adapted to the installation conditions in certain devices and allows better use of space than conventional impeller pumps.
  • a pump with the features of claim 1.
  • the functions of the pump head and the electric drive succeed Realize the same height along the axis of the pump and thus reduce the overall length of the pump in the axial direction.
  • the impeller In most conventional impeller pumps, the impeller has a hub from which the vanes protrude and the free ends of the vanes rotate along a stationary housing wall of the pump.
  • the flow path is not limited by this housing wall, but by a wheel rim, which is part of the impeller and is connected to its hub via the vanes. This wheel rim carries the rotor of the electrical machine.
  • the electrical machine is preferably of the type excited by at least one permanent magnet, in particular a brushless DC machine.
  • the at least one permanent magnet of such a machine is preferably surrounded in one piece by the wheel rim in order to protect it from contact with the liquid to be pumped.
  • the wheel rim, or preferably the entire impeller can be produced by extrusion coating the permanent magnet with a plastic material.
  • a stator of the electrical machine is preferably arranged radially outside of the rotor.
  • a wall of the pump chamber then expediently runs through a gap formed between the stator and the rotor.
  • the housing of the pump is preferably made up of a first and a second part, the first part being a cylindrical section, which can in particular be the wall running through the gap between the stator and the rotor, an inlet bounding shoulder at a first end of the cylindrical portion and an outward shoulder at a second end of the cylindrical portion, and the second portion forms a lid mountable to the second shoulder.
  • the impeller can be easily inserted from the second end into the cylindrical section of the first housing part and enclosed therein by mounting the cover, while the stator can be pushed on from the first side of the cylindrical section.
  • a socket for one end of a shaft of the impeller is expediently formed on each of the two parts of the housing.
  • the impeller In order to achieve low-friction suspension of the impeller, it is preferably mounted on the shaft via at least one ring bearing. Such is expedient
  • Ring bearing firmly connected to the impeller and rotatable around the stationary shaft.
  • the impeller itself is therefore not exposed to any direct friction and can therefore be made of an inexpensive material with low friction, without affecting the life of the pump.
  • At least one axial channel is provided on the inner surface of the ring bearing.
  • the liquid pumped by the pump can penetrate into this channel, which on the one hand cools the bearing and on the other hand promotes the formation of a friction-reducing liquid film between the inner surface of the ring bearing and the shaft.
  • the ring bearing expediently has two sections with different outside diameters, a first section with a small outside diameter engaging in a central bore of the impeller and the second section with a larger outside diameter coming to lie outside the central bore and thus forming a stop which defines the axial position of the Specifies ring bearing on the impeller.
  • two ring bearings are preferably inserted into the central bore of the impeller from opposite ends. These two ring bearings are preferably identical.
  • the pump according to the invention is particularly suitable for being installed in a device such as a dishwasher with a vertically oriented axis of the impeller. In this way, the pump only occupies a small height within an installation space to be kept as low as possible in favor of the rinsing chamber below the rinsing chamber.
  • the diameter of the pump according to the invention which may be enlarged in comparison to a conventional pump of the same power, generally throws in such an installation space with small vertical but large lateral dimensions no problems.
  • the inlet is located higher than the outlet.
  • its impeller is exposed to a pressure of the pumped medium acting in the direction of the inlet, so that when the inlet is at a high position, axial forces acting on the bearings of the impeller, caused on the one hand by this pressure and on the other hand by the weight of the impeller are, at least partially compensate each other and thus lead to a low bearing load.
  • a washer is preferably rotatably attached to one end of the shaft, which comes to rest between the socket and its adjacent rotating parts when the shaft is mounted.
  • the compressive force acting in the direction of the inlet outweighs the weight of the impeller regardless of the installation position, so that the end of the shaft to which the washer is attached, preferably the end on the inlet side the wave will be.
  • FIG. 1 shows an axial section through a pump according to a first embodiment of the invention
  • Fig. 4 shows a perspective view of a ring bearing of the pump
  • Fig. 5 shows an axial section through a second embodiment of the invention.
  • the housing of the pump shown in Fig. 1 is composed of two parts 1, 2, the z. B. are made in one piece from plastic.
  • the first housing part 1 has a cylindrical section 3, on the two ends of which a shoulder 4, which extends radially inward with respect to the axis of the cylindrical section 3, and a radially outwardly extending shoulder 5 are formed.
  • the inwardly extending shoulder 4 defines an inlet opening 6 of the pump.
  • a holder 7 for a shaft 18 is held by struts 8, which connect the holder 7 to the inward shoulder 4.
  • a peripheral rib 9 is formed concentrically to the axis.
  • the ridge 9 has a uniformly to a quarter of a circle curved inner surface and a cylindrical outer surface on which a cylindrical outer wall is plugged 10 of the 'second housing part. 2
  • a second socket 13 is provided for the opposite end of the shaft 18.
  • the bottom 11 and the outer wall 10 are connected to one another by a circumferential channel 13, the free cross section of which is maximum at the level of an outlet connection 14 starting from the channel 13 and from there decreases uniformly in both directions to a diametrically opposite point of the channel 13.
  • the impeller 15 has, in a manner known per se, a hub 16 in the form of a rotational hyperboloid or a cone, the opening angle of which extends towards the apex, i.e. to the inlet opening 6, progressively narrowing, and which carries a plurality of vanes 17, each extending in a plane running through the longitudinal axis of the pump.
  • the hub 16 has an axial bore, the diameter of which is larger than that of the shaft 18 running through it and held in the sockets 7, 12.
  • the shaft 18 is shown in FIG. 3 in a perspective view. It has the shape of an essentially cylindrical metal rod, which is provided at its two ends with axially parallel flats 25 which each give the ends a non-circular cross-section.
  • the sockets 7, 12 are each complementary to this non-circular cross section, so that the shaft 18 is held in the pump housing in a rotationally fixed manner.
  • a metallic washer 28 is loosely pushed onto one of the ends of the shaft 18. It has a central opening with a shape that is complementary to the flattened end of the shaft 18, so that it can be moved over the axial extent of the flattened portion 25, but cannot be rotated.
  • the impeller 15 is held on the shaft 18 by means of two identical ring bearings 27, one of which is shown in a perspective view in FIG. 4.
  • the ring bearing 27 is a one-piece sleeve made of metal. It has two on top of each other in the axial direction following sections 29, 30, which are connected via a radial shoulder (facing away from the viewer in FIG. 4).
  • the outer diameter of the narrower section is dimensioned such that it can be pressed into the axial bore of the hub 16; while the second section, as shown in FIG. 2, projects beyond the hub 16 in the axial direction.
  • the inner diameter of a central bore of the ring bearing 27 is slightly larger than the outer diameter of the shaft 18, the clearance between the two being dimensioned such that a film of the liquid to be pumped can form between the two during operation of the pump.
  • the penetration of the liquid between the ring bearing 27 and the shaft 18 is promoted by two radial slots 31 which are formed on the end face of the section 30 and each open onto a channel 32 which extends in the axial direction over the inner surface 33 of the bore.
  • the vanes 17 of the impeller 15 carry a wheel rim 19 which is curved in a manner similar to the surface of the hub 16 and, together with this, delimits a flow path 20 which initially runs axially downward from the inlet opening 6, and then continues into the radial direction Turn direction, and finally exits the impeller 15 on its peripheral surface and reaches the groove 12.
  • a permanent magnet 21 and a sheet metal packing 22 are embedded in the wheel rim. Magnet 21 and sheet metal packing 22 form a ring through which flow path 20 runs. A ring of electromagnets 23 is arranged around this ring.
  • the permanent magnet 21 and electromagnet 23 form the rotor or the stator of a brushless, electronically commutated direct current motor.
  • the cylindrical section 3 of the first housing part 1, which is only a fraction of a millimeter thick at the height of these magnets, and a thin layer of the wheel rim 19 enclosing the permanent magnet 21 extend through an air gap between the permanent magnet and the electromagnet.
  • the wheel rim 19 is surrounded all around by the liquid flowing through the pump. Since the permanent magnet 21 and sheet metal packing 22 are extrusion-coated by the material of the wheel rim 19, they are protected from the liquid.
  • the electromagnets 23 are separated from the liquid by the one-piece, sealed wall of the first housing part 1. A There is no rotary union that could leak during operation and could allow liquid to be pumped to live parts of the pump. The only seals that are required on the pump according to the invention are those between the two housing parts 1, 2, which, for. B.
  • FIG. 5 shows an axial section similar to that of FIG. 1 through a pump according to a second embodiment of the invention.
  • This second embodiment is characterized by a somewhat simplified structure with a reduced number of parts. It differs from the embodiment described above by the suspension of the impeller. 5, the impeller 15 'is integrally and positively formed on the shaft 18', namely by providing the shaft 18 'with a central flat 25 and overmolded with the hub of the impeller 15'. As a result of the positive connection, the shaft 18 'rotates with the impeller 25' and is rotatably received in the bearing sections 7 ', 12' of the two housing parts 1 ', 2'.
  • Ring bearings 27 ' are inserted into the bearing sections 7', 12 'in order to hold the shaft 18' rotatably.
  • a ball 34 ' is enclosed in the upper bearing section 7', which is rotatable both with respect to the bearing section 7 'and with respect to the shaft 18' and, if the impeller 15 'due to it Back pressure acting on the bearing portion 7 'is clamped between this and the end of the shaft 18'.
  • a corresponding ball could also be provided between the bearing section 12 'and the shaft 18', or, as indicated in FIG. 5, the shaft 18 'can simply be tapered at its end engaging in the bearing section 12', as by a 5 shown, so that the contact surface between the shaft 18 'and the bearing portion 12' is essentially limited to a point lying on the axis of rotation.

Landscapes

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

Abstract

L'invention concerne une pompe comportant une chambre dans laquelle sont placés une roue à ailettes (15, 15') et un rotor (21, 22), relié à la roue à ailettes, d'une machine électrique. Un parcours d'écoulement (20) s'étend de l'entrée (6) à la sortie (14) de la chambre de pompe à travers un passage central du rotor (21, 22).
EP03773684A 2002-11-05 2003-10-31 Pompe a entrainement electrique Withdrawn EP1573207A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10251461A DE10251461A1 (de) 2002-11-05 2002-11-05 Elektrisch angetriebene Pumpe
DE10251461 2002-11-05
PCT/EP2003/012155 WO2004044434A1 (fr) 2002-11-05 2003-10-31 Pompe a entrainement electrique

Publications (1)

Publication Number Publication Date
EP1573207A1 true EP1573207A1 (fr) 2005-09-14

Family

ID=32103347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03773684A Withdrawn EP1573207A1 (fr) 2002-11-05 2003-10-31 Pompe a entrainement electrique

Country Status (7)

Country Link
US (1) US7131823B2 (fr)
EP (1) EP1573207A1 (fr)
CN (1) CN100443732C (fr)
AU (1) AU2003282068A1 (fr)
DE (1) DE10251461A1 (fr)
MX (1) MXPA05004774A (fr)
WO (1) WO2004044434A1 (fr)

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DE10251463A1 (de) * 2002-11-05 2004-05-19 BSH Bosch und Siemens Hausgeräte GmbH Elektrisch angetriebene Pumpe
DE10352487A1 (de) * 2003-07-22 2005-02-10 BSH Bosch und Siemens Hausgeräte GmbH Pumpe mit integriertem Motor
US7322792B2 (en) * 2004-10-08 2008-01-29 Asia Vital Component Co., Ltd. Cooling fan without returning flow
EP2302171A1 (fr) 2004-11-12 2011-03-30 Board of Trustees of Michigan State University Turbomachine avec plusieurs roues et procédé d'opération
US8241434B2 (en) * 2005-01-25 2012-08-14 Johnson Electric S.A. Dishwasher with high voltage DC motor
DE102005039557A1 (de) * 2005-08-22 2007-03-01 Robert Bosch Gmbh Kreiselpumpe
TWI363141B (en) * 2006-01-11 2012-05-01 Delta Electronics Inc Water pump and bearing thereof
JP5163958B2 (ja) * 2008-12-22 2013-03-13 アイシン精機株式会社 電動流体ポンプと電動流体ポンプのケーシングのインサート成形用金型
US9388811B2 (en) * 2009-06-23 2016-07-12 Asia Vital Components Co., Ltd. Micropump structure
EP2273123B9 (fr) 2009-07-08 2018-03-21 Pierburg Pump Technology GmbH Sécurisation d'une roue de pompe centrifuge
DE102009047910B4 (de) * 2009-09-22 2022-04-28 Deutsche Vortex Gmbh & Co. Kg Läufereinheit für einen Elektromotor und Wasserpumpe mit Elektromotor
US20110240070A1 (en) * 2010-03-30 2011-10-06 Emerson Electric Co. Offset Inlet Dishwasher Pumps
DE102011086460A1 (de) * 2011-11-16 2013-05-16 Robert Bosch Gmbh Flüssigkeitspumpe mit axialer Anlaufscheibe
DE102012200806B4 (de) * 2012-01-20 2014-07-31 Yasa Motors Poland Sp. z.o.o. Nassläuferpumpe mit Leistungselektronik
KR101481627B1 (ko) * 2012-06-11 2015-01-14 주식회사 아모텍 워터 펌프
EP2730785B1 (fr) * 2012-11-07 2018-07-25 Pierburg Pump Technology GmbH Pompe à liquide électrique d'automobile
JP5882245B2 (ja) * 2013-02-26 2016-03-09 シナノケンシ株式会社 電動流体ポンプの製造方法
BR102014021617B1 (pt) * 2014-09-01 2023-04-11 Mundial S/A Produtos De Consumo Motobomba de mancal flutuante arrefecida por um fluido circulante
US10941781B2 (en) 2015-11-10 2021-03-09 Pierburg Pump Technology Gmbh Electric motor vehicle axial-flow liquid pump
US20170363362A1 (en) * 2016-06-16 2017-12-21 Asia Vital Components Co., Ltd. Water-cooling device
JP2018135805A (ja) * 2017-02-22 2018-08-30 シナノケンシ株式会社 遠心ポンプ
DE102018107271A1 (de) * 2018-03-27 2019-10-02 Miele & Cie. Kg Wasserführendes Haushaltsgerät, insbesondere Geschirrspülmaschine
DE102018208820A1 (de) 2018-06-05 2019-12-05 BSH Hausgeräte GmbH Elektrischer Antriebsmotor, Nassläufer-Pumpe und Haushaltsgerät
CN111350668B (zh) * 2018-12-20 2022-03-04 福建涟漪电器有限公司 无轴驱动静音增压泵及实现方法
DE102021205247A1 (de) * 2021-05-21 2022-11-24 E.G.O. Elektro-Gerätebau GmbH Pumpe für ein wasserführendes Haushaltsgerät und wasserführendes Haushaltsgerät mit einer solchen Pumpe
EP4397864A4 (fr) * 2021-09-03 2025-08-06 Ebara Corp Motopompe
US12117016B2 (en) * 2021-12-03 2024-10-15 Hamilton Sundstrand Corporation Shaftless rotary machine
US12076930B2 (en) 2021-12-03 2024-09-03 Hamilton Sundstrand Corporation Additively manufacturing an impeller and motor rotor
DE102022204154A1 (de) 2022-04-28 2023-11-02 Robert Bosch Gesellschaft mit beschränkter Haftung Pumpenvorrichtung für eine Pumpe, Verfahren zu Herstellung einer solchen Pumpenvorrichtung, Pumpe mit einer solchen Pumpenvorrichtung und Verfahren zur Montage einer solchen Pumpe
KR102769280B1 (ko) * 2022-11-01 2025-02-20 주식회사 코아비스 전동식 워터 펌프

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Also Published As

Publication number Publication date
US20060045776A1 (en) 2006-03-02
CN100443732C (zh) 2008-12-17
MXPA05004774A (es) 2005-07-22
US7131823B2 (en) 2006-11-07
AU2003282068A1 (en) 2004-06-03
WO2004044434A1 (fr) 2004-05-27
CN1711423A (zh) 2005-12-21
DE10251461A1 (de) 2004-05-13

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