EP1567772A1 - Pompe a entrainement electrique - Google Patents

Pompe a entrainement electrique

Info

Publication number
EP1567772A1
EP1567772A1 EP03772283A EP03772283A EP1567772A1 EP 1567772 A1 EP1567772 A1 EP 1567772A1 EP 03772283 A EP03772283 A EP 03772283A EP 03772283 A EP03772283 A EP 03772283A EP 1567772 A1 EP1567772 A1 EP 1567772A1
Authority
EP
European Patent Office
Prior art keywords
impeller
pump
pump according
rotor
inlet
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Withdrawn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
EP03772283A
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 EP1567772A1 publication Critical patent/EP1567772A1/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Withdrawn legal-status Critical Current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
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • 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
    • F04D29/043—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
    • 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.
  • the 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, which are caused on the one hand by this pressure and on the other hand by the weight of the impeller, compensate each other at least partially 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. 2 shows the individual parts of the pump in an exploded view
  • Fig. 3 shows a perspective view of the shaft of the pump
  • Fig. 4 shows a perspective view of a ring bearing of the pump.
  • the housing of the pump 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. In the middle of this inlet opening 6, 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 rib 9 has an inner surface curved evenly to a quarter circle and a cylindrical outer surface on which a cylindrical outer wall 10 of the second housing part 2 is attached.
  • 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 successive sections 29, 30 in the axial direction, 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. There is no rotating union that will 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.

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) 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).
EP03772283A 2002-11-05 2003-10-31 Pompe a entrainement electrique Withdrawn EP1567772A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10251463 2002-11-05
DE10251463A DE10251463A1 (de) 2002-11-05 2002-11-05 Elektrisch angetriebene Pumpe
PCT/EP2003/012152 WO2004044433A1 (fr) 2002-11-05 2003-10-31 Pompe a entrainement electrique

Publications (1)

Publication Number Publication Date
EP1567772A1 true EP1567772A1 (fr) 2005-08-31

Family

ID=32115231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03772283A Withdrawn EP1567772A1 (fr) 2002-11-05 2003-10-31 Pompe a entrainement electrique

Country Status (5)

Country Link
US (1) US20050260088A1 (fr)
EP (1) EP1567772A1 (fr)
CN (1) CN100400892C (fr)
DE (1) DE10251463A1 (fr)
WO (1) WO2004044433A1 (fr)

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DE10319762A1 (de) * 2003-04-30 2004-12-02 Behr Gmbh & Co. Kg Kreislauf zur Kühlung von Ladeluft und Verfahren zum Betreiben eines derartigen Kreislaufs
US7478992B2 (en) * 2004-05-19 2009-01-20 Delta Electronics, Inc. Heat-dissipating device
TWI363141B (en) * 2006-01-11 2012-05-01 Delta Electronics Inc Water pump and bearing thereof
US20080112824A1 (en) * 2006-11-09 2008-05-15 Nidec Shibaura Corporation Pump
US20090162225A1 (en) * 2007-12-20 2009-06-25 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Pump for liquid cooling system
DE102012209487A1 (de) * 2012-06-05 2013-12-05 Mahle International Gmbh Hydrodynamische Pumpe
CN102817868B (zh) * 2012-08-09 2016-05-18 文树平 一种抽油烟机的涡流式叶轮
DE102014202570A1 (de) * 2014-02-12 2015-08-13 BSH Hausgeräte GmbH Elektrischer Antriebsmotor, Pumpe und Haushaltsgerät mit einer solchen Pumpe
US10934992B2 (en) * 2019-02-18 2021-03-02 Toto Ltd. Hydraulic generator, spouting apparatus, and method for manufacturing hydraulic generator

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Also Published As

Publication number Publication date
WO2004044433A1 (fr) 2004-05-27
CN100400892C (zh) 2008-07-09
CN1711424A (zh) 2005-12-21
US20050260088A1 (en) 2005-11-24
DE10251463A1 (de) 2004-05-19

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