EP4092273A1 - Pompe pour un appareil électroménager à circulation d'eau et appareil électroménager à circulation d'eau doté d'une telle pompe - Google Patents

Pompe pour un appareil électroménager à circulation d'eau et appareil électroménager à circulation d'eau doté d'une telle pompe Download PDF

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Publication number
EP4092273A1
EP4092273A1 EP22173154.0A EP22173154A EP4092273A1 EP 4092273 A1 EP4092273 A1 EP 4092273A1 EP 22173154 A EP22173154 A EP 22173154A EP 4092273 A1 EP4092273 A1 EP 4092273A1
Authority
EP
European Patent Office
Prior art keywords
pump
impeller
bearing
drive
rotor
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.)
Pending
Application number
EP22173154.0A
Other languages
German (de)
English (en)
Inventor
Robin Abendschön
Daniel Fuchs
Uwe Kögel
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau 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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP4092273A1 publication Critical patent/EP4092273A1/fr
Pending 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
    • 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
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • 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
    • F04D29/18—Rotors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of 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
    • 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
    • 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
    • F04D13/0606—Canned motor 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
    • 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
    • F04D13/0606—Canned motor pumps
    • F04D13/0633—Details of the 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
    • 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
    • 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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/22—Manufacture essentially without removing material by sintering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced
    • F05D2300/6033—Ceramic matrix composites [CMC]

Definitions

  • the invention relates to a pump for a water-bearing household appliance and a water-bearing household appliance with such a pump, the pump being an impeller pump.
  • an impeller pump for a dishwasher is known as a water-bearing household appliance.
  • the pump or a pump drive for it is designed as a so-called wet rotor, and a drive rotor is firmly connected to an impeller by means of a shaft.
  • the drive rotor is therefore partially surrounded by or comes into contact with water from the pump chamber.
  • the drive rotor has ferromagnetic material.
  • a drive stator with a corresponding stator winding runs radially on the outside around the drive rotor.
  • the invention is based on the object of creating a pump as mentioned at the outset and a water-conducting household appliance provided with such a pump, with which problems of the prior art can be solved and in particular it is possible to create a practical and easy-to-install pump.
  • the pump is designed as an impeller pump and has a pump housing and a pump chamber therein.
  • the pump housing is made up of at least three parts, namely a pump upper part, a pump lower part and an outer pump wall.
  • the pump chamber itself is formed by the upper part of the pump and the lower part of the pump as well as the outer wall of the pump, and is therefore partially formed directly by the pump housing.
  • the pump housing has numerous other parts or some of the parts mentioned, in particular the pump upper part and the pump lower part, go beyond this functionally and structurally and serve even more functions than just those required for the pump chamber.
  • the pump outer wall is advantageously only the peripheral boundary for the pump chamber between the upper pump part and the lower pump part, in particular it can be tubular.
  • a pump inlet into the pump housing and a pump outlet out of the pump housing are provided, with the pump inlet advantageously running directly into the pump chamber.
  • the pump outlet advantageously runs out of the pump chamber. Due to the configuration as an impeller pump, the pump inlet is at least in the pump chamber in the axial direction of the pump.
  • the pump outlet runs at least out of the pump chamber at an angle thereto, advantageously between 60° and 120°, particularly advantageously almost or completely tangentially or as an externally intersecting secant.
  • the pump has a heating device which is formed on the outer wall of the pump or which itself forms the outer wall of the pump.
  • the pump has a pump drive, which has a drive rotor and a drive stator in a conventional manner.
  • a bearing shaft is also provided which runs along the longitudinal axial axis of the pump.
  • the drive stator has a stator winding, so that the drive rotor is not electrically contacted.
  • the entire pump drive is designed as a wet rotor, so that the drive rotor runs in the water, so to speak, or is at least partially surrounded by water and is therefore also connected to the pump chamber for water conduction or is in the pump chamber.
  • the bearing shaft is arranged in a fixed and immovable manner on the pump housing; detailed options are explained in more detail below.
  • the drive rotor is rotatably arranged on the bearing shaft, advantageously by means of suitable bearings.
  • the drive rotor can be arranged or run on a floor or just above a floor of the lower part of the pump.
  • the impeller is firmly connected to the drive rotor and is therefore also rotatably mounted on the rotary shaft. Furthermore, due to the fixed connection, it is immovable relative to the drive rotor. It can be designed or manufactured at least partially together with this, which will be explained in more detail below.
  • stator winding is arranged on an area of the lower part of the pump that borders the pump chamber outwards in the radial direction, i.e. on its other side, in such a way that essentially only one wall of the lower part of the pump runs between the pump chamber in this area and the stator winding or only one or a single wall of the lower part of the pump runs here, in particular no other components between the pump chamber and the stator winding in this area.
  • the pump chamber is in pulled so far down in the axial direction of the pump or the drive stator is shifted so far up towards the impeller that the drive stator or its stator winding are also surrounded by the pump chamber in the radial direction.
  • stator winding allows for good cooling of the stator winding by the water in the pump chamber. Furthermore, a compact design in the axial direction can be achieved in this way.
  • the stator winding is thus surrounded by the pump chamber like a ring. It is important to ensure that the drive stator is sealed off from the pump chamber.
  • a pump can be created by the invention, which allows an advantageous cooling of the drive stator or its stator winding. Cooling of the drive rotor can advantageously take place in that it is designed as a wet rotor and is therefore well cooled anyway.
  • the design which is compact in the axial direction, enables the pump to have a relatively short length and thus an advantageous arrangement in the household appliance, without taking up an unnecessarily large amount of space.
  • the drive stator has a stator winding running radially on the outside and means for guiding the magnetic field radially inside it.
  • These means for guiding the magnetic field are advantageously designed as a laminated stator core, as is known per se.
  • This structure has the advantage that the magnetic field towards the drive rotor, which is arranged radially inside it and surrounded by the drive stator, can be designed as well as possible or can be designed as desired.
  • the stator winding, which runs radially on the outside is therefore as close as possible to the pump chamber surrounding it and can therefore be cooled as well as possible by the water that is located there and circulates.
  • the drive stator is preferably located, viewed in the radial direction, between the drive rotor, which is radially inside of it, and the pump chamber or a part or section of the pump chamber, which is arranged radially outside of it.
  • that area of the pump chamber that merges completely or at least partially into the pump outlet is located radially outside of the drive stator.
  • the drive stator has the mentioned means for guiding the magnetic field in addition to the stator winding
  • the drive rotor can have ferromagnetic material or a laminated rotor core.
  • the drive rotor advantageously has ferromagnetic material, which can be embedded in plastic or surrounded by plastic walls, for example. This can be a so-called rotor housing, so that this ferromagnetic material or rotor lamination stack cannot come into contact with water.
  • a ready-made ferromagnetic material for example in the form of a ring or part of a ring, can be overmoulded with plastic or inserted and glued into prefabricated plastic parts, for example in the form of a shell.
  • the ferromagnetic material of the drive rotor can be admixed with or mixed with plastic.
  • the entire drive rotor can thus be manufactured in a casting process or plastic injection molding process.
  • At least part of the impeller can possibly also be produced in the same step, in particular a lower cover disk, which will be explained below.
  • the pump chamber does not run completely outside of the drive stator in the axial length thereof, but only partially. However, it should advantageously run along at least 70% of its axial length, in particular along at least 90%. The best possible cooling of the drive stator or its stator winding can then be achieved by the water in the pump chamber. However, the pump chamber does not have to run completely on the outside of the drive stator or the stator winding.
  • an upper side or an upper end face of the drive stator or the stator winding also rests against the pump chamber.
  • the upper end face of the drive stator is separated from the pump chamber by the wall of the lower part of the pump. This means that the water in the pump chamber can also be used for cooling here, so that the drive stator can even be cooled on two sides.
  • the pump inlet runs centrally and axially into the pump housing and into the pump chamber.
  • the impeller can then be connected directly to the pump inlet.
  • the pump inlet can be designed at least partially in the form of a tube or in the manner of a pipe socket.
  • the pump inlet can be formed on the upper part of the pump itself or can be formed by this.
  • the pump outlet in turn, can, independently of this, be formed on the lower part of the pump and, seen in the axial length of the pump, can be arranged at least below the impeller.
  • the pump outlet may be even further away from the pump inlet along the axial length of the pump, for example at least partially below the drive stator. However, it does not have to lie completely below the drive stator, which in turn can limit the overall axial length of the pump.
  • the pump outer wall is advantageously tubular, in particular cylindrical or round-cylindrical.
  • the tube section may be cut straight at both ends and perpendicular to its axial length.
  • the outer wall of the pump also runs concentrically to the longitudinal center axis of the pump and to the bearing shaft.
  • Heating conductors can be arranged on an outside of the pump outer wall in order to form the heating device. These heating conductors can be in the form of thin-film or thick-film heating devices, alternatively using other heating means such as tubular heating elements. It is thus possible for the heating conductors to be separated from the water in the pump chamber by the outer wall of the pump.
  • a thin pump outer wall for example 0.1 mm to 3 mm, allows very good heat transfer into the water in the pump chamber.
  • the outer wall of the pump can be made of metal, for example as a metal tube, and the aforementioned heating conductors can be printed on as a thin-film or thick-film heating device.
  • WO 2014/198427 A1 as well as the DE 10 2011 003 464 A1 referred.
  • the bearing shaft is fixedly arranged on the lower part of the pump by being pressed or even injected into it.
  • the bearing shaft is advantageously made of metal, alternatively it can also be made of plastic, for example a different plastic than the rest of the lower part of the pump, preferably stable fiber-reinforced plastic. Corrosion problems can thus also be reduced.
  • the drive rotor which is rotatable relative to the bearing shaft, is advantageously rotatably mounted thereon in its lower region by means of a radial bearing.
  • a further radial bearing can be provided in the upper part of the drive rotor, possibly also on an impeller arranged above it which is fixedly connected to it.
  • this does not have to be the case, especially if an axial bearing at the upper end of the impeller also causes a certain radial bearing.
  • the arrangement of the thrust bearing at the top of the impeller has the advantage that it can easily rest against a counter-thrust bearing. This is mounted in the pump inlet, advantageously by means of radially running webs.
  • the counter-axial bearing and the axial bearing are therefore in the incoming flow of water, but at the same time this can cause cooling and possibly also lubrication, and other points are even more complicated. Furthermore, no special bearing shaft has to be provided, but this can be designed very simply and straight. It is thus possible to limit oneself to a total of two bearings, namely the radial bearing and the axial bearing.
  • a radial bearing can be made of plastic on the one hand, and of suitable ceramic or a sintered material on the other hand. It can be clamped or glued to the drive rotor, alternatively it can also be injected. In order to be able to design it simply, it should be designed in such a way that it does not have to or cannot absorb any forces in the axial direction. It is also possible to provide sealed roller bearings, in particular ball bearings or needle bearings, which usually have even lower friction. These should then be well sealed.
  • the axial bearing advantageously consists of a different material than the impeller on which it is arranged. It can be manufactured separately and placed on the impeller or on the drive rotor. It may also be molded onto the impeller, for example in a two-component injection molding process.
  • the thrust bearing can have a convex tip on the impeller. This can be convexly curved in the direction from the impeller to the pump inlet, and if the counter-thrust bearing is also curved in a similar way, radial centering can be made possible in addition to the axial contact. Since the axial bearing is arranged at the point of the rotating part that is furthest away or is arranged highest, the best possible balance of forces is available for both the axial bearing and the radial bearing for a desired, defined bearing of the assembly of drive rotor and impeller given. Alternatively, it is also conceivable to curve the axial bearing on the impeller and the counter-axial bearing in the opposite direction, which also allows radial bearing as centering in addition to axial bearing.
  • An axial bearing possibly also the counter-axial bearing, can have graphite-containing plastic or be made of graphite-containing plastic. It can be injected or injected both on the impeller and on the upper part of the pump, possibly also be attached later, for example glued and/or clamped.
  • an axial bearing for the drive rotor can be provided on its radial bearing. Only a single bearing needs to be provided, which, however, would have to be designed in a significantly more complex manner.
  • the impeller is usually pulled in the axial direction towards the pump inlet due to its pump function, so that the axial bearing described above is sufficient to move it here in support in the axial direction.
  • the drive rotor/impeller is stationary, there can even be a distance between the axial bearing and the counter-axial bearing, advantageously in the aforementioned range, particularly advantageously between 0.5 mm and 3 mm. It can also be achieved in this way that the two bearings mentioned, namely axial bearings and radial bearings, are sufficient.
  • the drive rotor and the impeller are not rotating, it can be provided that a free end or an end surface of the bearing shaft bears against an end or an inner end surface of a receiving opening on the impeller, into which the bearing shaft is inserted.
  • a distance is provided in between. This distance can be between 1 mm and 10 mm, for example.
  • the drive rotor can still rotate when the pump is dry, and a bearing and thus also friction arises only between the end of the bearing shaft and the said inner end face of the impeller. This can be absorbed well here, for example through structural design or appropriate choice of material. In any case, this can prevent the underside of the drive rotor from rubbing or scratching the lower part of the pump. Realistically, it is not possible to prevent the pump from running dry, but at least damage that may result from this can be avoided.
  • a structural unit made up of impeller and drive rotor can be formed at least partially in one piece in such a way that at least one lower part of the impeller is advantageously formed together with the rotor housing or the entire drive rotor.
  • a lower part of the impeller can include not only a type of lower impeller cover plate, but also an area of the impeller that is usually raised radially on the inside. This area, which is raised radially on the inside, can form or have the above-described axial bearing at its highest point.
  • an upper part of the impeller can then be designed as a separate part, advantageously made of plastic, and attached to the lower part of the impeller.
  • a fastening should not be detachable here, gluing, welding, ultrasonic welding or friction welding are possible.
  • This upper part of the impeller advantageously also has the impeller blades at least partially, advantageously entirely.
  • a mold and thus also a manufacturing process for the lower part of the impeller, including the drive rotor or rotor housing, can be designed in a simple manner.
  • the impeller can be manufactured separately from the drive rotor, for example in a single-component or multi-component injection molding process.
  • the impeller can be advantageous be manufactured in one piece, alternatively in two parts with a lower part and an upper part, the impeller blades being formed on one of the two parts.
  • the impeller connected to it is then connected to the drive rotor to form a structural unit, for example glued or welded in one of the aforementioned ways.
  • the pump outlet can be provided in an area of the pump or the pump chamber which, viewed in the longitudinal direction of the pump, is located furthest away from the pump inlet.
  • This can advantageously also be the deepest part of the pump chamber, so that with a possible vertical arrangement of the pump, water automatically drains out of the pump chamber, at least if a drain or the like. not by means of a valve or the like. is locked. In this way, hygienic problems within the pump or within the pump chamber can be reduced.
  • the pump inlet can be designed to be increasingly widened upwards or in the direction away from the impeller or the pump chamber, in addition to a possible aforementioned tubular shape.
  • a kind of flat, wide funnel can be formed here.
  • a widening advantageously takes place to a diameter that is even larger than the pump chamber. In this way, a sump for a dishwasher or a washing machine can be formed so that it does not have to be manufactured as a separate part and then connected to the pump inlet in a watertight manner.
  • At least one guide vane can be provided on the lower part of the pump, which protrudes into the pump chamber.
  • a guide vane is advantageously provided on a wall that runs radially outwards outside and possibly along the drive stator, advantageously in the axial direction.
  • Such a guide vane is particularly preferably produced in one piece and in one piece with the lower part of the pump. In the direction of circulation of the pumped water, it can have a slope downwards or towards the pump outlet and serve to control the water flow within the pump chamber.
  • latching devices can be provided on the pump or on the pump housing in order to hold it together.
  • the locking devices are integrally formed in one piece and all run equally either from the upper part of the pump to the lower part of the pump or vice versa.
  • the latching devices can be integrally and integrally connected at one end to one of the two parts of the pump housing or formed thereon. The other free end is snapped onto the other part. Then separate means can be dispensed with to hold the pump housing together.
  • the pump is installed vertically in a water-bearing household appliance, so that the bearing shaft runs vertically. It is advantageously provided that the pump inlet points upwards or is arranged at the top and thus forms the highest part of the pump. As has been described above, the pump outlet then forms the lowest point of the pump chamber, for example for an advantageous automatic, extensive emptying of the pump chamber.
  • the pump is preferably arranged directly below a treatment chamber of the water-bearing household appliance, in particular when installed in a dishwasher, so that no interposed valves or the like are required here either. are necessary.
  • a dishwasher 11 is shown schematically as a household appliance according to the invention with a housing 12 and a rinsing chamber 14 as a water treatment chamber therein, which is designed in principle as usual and known.
  • a conventional rinsing arm 16 is indicated at the top of the rinsing chamber 14, it also being possible for more rinsing arms to be provided in it, of course, especially in the lower region. It is supplied by means of a water line 38 shown in dashed lines.
  • the washing chamber 14 has a floor 17, which is centered in a large depression 18, which is designed like a funnel and forms a sump 19 with a previously described process. In this case, the depression 18 can also be partially covered by a grid, for example as a filter.
  • the walls of the washing chamber 14 and the floor 17 are usually made of metal or stainless steel.
  • the recess 18 in turn can be made of plastic, alternatively also of metal.
  • a pump 22 is arranged as an impeller pump and connected to it in a known manner in a water-conducting manner.
  • a connection of the pump 22 to the recess 18 advantageously has a seal, not shown.
  • An attachment between the two parts recess 18 and pump 22 can be done arbitrarily.
  • the pump 22 has a pump housing 23 with a pump inlet 24 and a pump outlet 25 of a circumferential pump chamber 26 that can be seen clearly in section , it has an angle of about 90° to the longitudinal axis of the pump. It can be connected to the aforesaid water line 38 directly or by means of valves.
  • a pump chamber 26 is formed in the pump housing 23 .
  • the pump chamber 26 is formed at the top by an upper pump part 28, in which the pump inlet 24 is formed centrally, and at the bottom by a lower pump part 29, from which the pump outlet 25 branches off to the left at the bottom.
  • the pump chamber 26 is delimited by the pump outer wall 33, which is advantageously designed as a heating device as described above.
  • it can have a round-cylindrical metal tube and heating conductors thereon on the outside, advantageously thick-film heating conductors.
  • the metallic pump outer wall 33 is sealed along the upper edge and along the lower edge by means of suitable seals on the pump upper part 28 and on the pump lower part 29 and is held in place by pressing them together.
  • a latching arm 34 is shown on the right, which is formed in one piece on the upper pump part 28 and is latched via a corresponding latching projection on the lower pump part 29 . Two to six such locking arms 34 can be distributed in the direction of rotation.
  • the design of the pump shell 28 is relatively simple from the 2 can be seen, where it also has the locking arms 34 mentioned.
  • the design of the lower part 29 of the pump is somewhat more complex; a middle region which is drawn downwards and forms a receiving recess 30 is provided here.
  • a bearing mount 32 which goes further down.
  • Radial outside of the receiving recess 30 there is a circumferential receiving bulge 30′ going upwards, so to speak.
  • This receiving bulge 30' is angled radially outwards by approximately 90° and then again runs approximately parallel to the longitudinal axis of the pump up to a type of pump chamber floor.
  • This pump chamber floor then merges into the pump outlet 25, as is also known from the pumps according to the prior art mentioned at the outset.
  • a guide vane 63 is shown on the wall pointing radially outwards, which vane is formed circumferentially and with a known pitch.
  • a drive rotor 35 is rotatably mounted essentially within the receiving recess 30 .
  • the drive rotor 35 has a ring-like arrangement of ferromagnetic material 36 which is arranged in a rotor housing 37 or surrounded by it.
  • the drive rotor 35 has a radial bearing 39 which is pressed in, for example.
  • the radial bearing 39 can advantageously consist of sintered metal or ceramic.
  • the drive rotor 35 can have a separate ring made of ferromagnetic material 36, which is either inserted or injected into a rotor housing 37 made of plastic.
  • the rotor housing 37 can also consist of at least two parts which enclose the ferromagnetic material 36 and are glued or welded together.
  • the radial bearing 39 can be pressed in and optionally also glued or welded.
  • the ferromagnetic material 36 in the form of granules or powder can be mixed with plastic and then the drive rotor 35 can be cast or injection-molded in one piece, so to speak.
  • the radial bearing 39 can be injected at the same time.
  • a bearing shaft 41 is inserted into the bearing receptacle 32 and fastened therein, preferably by means of a press fit or press fit. Alternatively, the bearing shaft 41 can also be injected into the lower pump part 29 or into the bearing mount 32 .
  • the bearing shaft 41 can be made of metal or stainless steel, alternatively it can also be made of a suitable stable plastic, for example a fiber-reinforced plastic. It therefore forms a fixed bearing shaft on which the drive rotor 35 is rotatably mounted by means of the radial bearing 39 .
  • a revolving drive stator 43 is arranged in the receiving bulge 30', which surrounds the receiving recess 30 and thus also the drive rotor 35 in the radial direction.
  • the drive stator 43 has a stator winding 45 which runs around or is arranged radially on the outside, and a stator lamination packet 46 is arranged at a small distance therefrom in the radially inner direction. This is used in a known manner to guide the magnetic field as desired.
  • the drive stator 43 can either be designed as an independent structural unit and then be fastened in the receiving bulge 30', for example glued or snapped in place.
  • stator winding 45 on the one hand and laminated stator core 46 on the other by means of casting resin 47 .
  • Electrical connections to the stator winding 45 are not shown here, but are easy to imagine and implement.
  • An impeller 50 is provided above the drive rotor 35 and is designed in a manner known per se.
  • the impeller 50 has a lower cover plate 52, which has a central elevation 53 that extends far upwards.
  • a bearing tip 55 mentioned at the outset is arranged on the elevation 53 as an axial bearing or as part of an axial bearing.
  • the bearing tip can be designed and fastened in the manner mentioned at the outset, for example it can be a part made of metal or ceramic that is glued on or injection-molded on.
  • the impeller 50 can either be produced in a manner known per se from two parts, namely essentially from the lower cover disk 52 and from the upper cover disk 57.
  • the impeller blades 58 can be arranged on one of these cover disks or can be produced in one piece and in one piece with it. Then the two parts of the impeller are connected to one another, for example glued or welded.
  • an impeller can also be made in one piece, as can be seen from FIG DE 102012209832 B3 is known. Then, however, the bearing tip 55, for example, must be attached later.
  • the impeller 50 can be connected to the drive rotor 35 in various ways.
  • the upper end of the bearing shaft 41 also protrudes into the impeller 50 from below, although there should be a radial distance here so that the bearing shaft 41 does not bear against or rub against the impeller 50 in the radial direction, at least during pumping operation or in normal operation. It can be seen that there is a small distance between the uppermost end of the bearing shaft 41 and the bottom surface of the impeller 50 opposite it, for example a few millimeters. This has been explained at the beginning. This distance serves to ensure that the structural unit made up of the drive rotor 35 and the impeller 50 can be moved somewhat downwards in the longitudinal direction of the pump.
  • the upper end of the bearing shaft 41 should strike the inside of the impeller 50 in the axial direction before the lowermost region of the drive rotor 35 or its rotor housing 37 rests against the receiving recess 30 .
  • the impeller 50 can also be mounted with a further radial bearing at the upper end of the bearing shaft 41 .
  • the axial bearing mentioned at the outset is formed by the bearing tip 55 on the impeller 50 .
  • a counter-thrust bearing 61 is arranged on a bearing holder 60 which is provided inside the pump inlet 24 , specifically there where the pump inlet 24 virtually opens into the pump chamber 26 .
  • the bearing holder 60 can be held in a manner known per se with two to four radial struts.
  • the counter-thrust bearing 61 can be glued to the bearing holder 60, alternatively it can be molded or injected. It advantageously consists of a suitable bearing material, for example ceramic or sintered metal, possibly also of a plastic such as Delrin or the like.
  • the drive rotor 35 and thus a pump drive is designed as a wet rotor. Water can run down to the receiving recess 30 within the pump chamber 26 between the drive rotor 35 and the lower pump part 29 . In this way, the drive rotor 35 can be water-cooled. Furthermore, there are no problems with a complex seal.
  • the drive stator 43 in particular the stator winding 45, can also be well cooled by water circulating in the pump chamber 26 due to the special arrangement within the receiving bulge 30'. Cooling is possible in the upper area of the receiving bulge 30', which runs approximately in the radial direction. A relatively direct cooling of the stator winding 45 is also possible on the side pointing radially outwards, where water is present in the region of the guide vanes 63 . Water is also present on the radially inward-pointing side of the receiving bulge 30 ′, ie toward the drive rotor 35 , and can thus also cool the laminated stator core 46 or, via this, the stator winding 45 .
  • the pump 22 is relatively short in the axial longitudinal direction due to a high degree of axial integration.
  • the assembly of drive rotor 135 and impeller 150 is designed differently here.
  • the ferromagnetic material 136 for the drive rotor 135 is designed in the form of a ring, but not with a rectangular cross section, but towards the middle slightly raised at the top.
  • This ferromagnetic material 36 is encapsulated with a rotor housing 137 which at the same time forms a lower cover plate 152 for the impeller 150 .
  • the central elevation 153 is also formed directly on it.
  • a Radial bearing 139 can in turn be injected directly, alternatively subsequently by clamping or the like. be attached.
  • An upper cover disk 157 of the impeller 150 is manufactured separately and is connected to it, for example glued. Impeller blades 158 can in turn be formed on one of the two parts; this is advantageously recommended on the upper cover plate 157.
  • a separate rotor housing 137 could be dispensed with entirely, and the entire drive rotor, possibly except for an upper cover disk of the impeller and/or the impeller blades, be produced by injection molding from a plastic to which a high proportion of ferromagnetic material is admixed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Textile Engineering (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22173154.0A 2021-05-21 2022-05-13 Pompe pour un appareil électroménager à circulation d'eau et appareil électroménager à circulation d'eau doté d'une telle pompe Pending EP4092273A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021205247.9A DE102021205247A1 (de) 2021-05-21 2021-05-21 Pumpe für ein wasserführendes Haushaltsgerät und wasserführendes Haushaltsgerät mit einer solchen Pumpe

Publications (1)

Publication Number Publication Date
EP4092273A1 true EP4092273A1 (fr) 2022-11-23

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ID=81653686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22173154.0A Pending EP4092273A1 (fr) 2021-05-21 2022-05-13 Pompe pour un appareil électroménager à circulation d'eau et appareil électroménager à circulation d'eau doté d'une telle pompe

Country Status (5)

Country Link
US (1) US20220372988A1 (fr)
EP (1) EP4092273A1 (fr)
KR (1) KR20220158208A (fr)
CN (1) CN115370584A (fr)
DE (1) DE102021205247A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060251513A1 (en) * 2003-07-22 2006-11-09 BSH Bosch und Siemens Hausgeräte GmbH Pump comprising an integrated engine
DE102011003464A1 (de) 2011-02-01 2012-04-26 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für eine Pumpe und Pumpe
DE102012209832B3 (de) 2012-06-12 2013-09-12 E.G.O. Elektro-Gerätebau GmbH Pumpe und Verfahren zum Herstellen eines Impellers für eine Pumpe
DE102012216196A1 (de) * 2012-09-12 2014-03-13 E.G.O. Elektro-Gerätebau GmbH Pumpe
WO2014198427A1 (fr) 2013-06-14 2014-12-18 E.G.O. Elektro-Gerätebau GmbH Pompe
EP2862494A1 (fr) * 2013-10-14 2015-04-22 E.G.O. Elektro-Gerätebau GmbH Appareil ménager véhiculant de l'eau
US20170302133A1 (en) * 2016-04-15 2017-10-19 Bühler Motor GmbH Electric motor with a plastic housing
DE102019206203A1 (de) * 2019-04-30 2020-11-05 E.G.O. Elektro-Gerätebau GmbH Wasserführendes Haushaltsgerät

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060251513A1 (en) * 2003-07-22 2006-11-09 BSH Bosch und Siemens Hausgeräte GmbH Pump comprising an integrated engine
DE102011003464A1 (de) 2011-02-01 2012-04-26 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für eine Pumpe und Pumpe
DE102012209832B3 (de) 2012-06-12 2013-09-12 E.G.O. Elektro-Gerätebau GmbH Pumpe und Verfahren zum Herstellen eines Impellers für eine Pumpe
DE102012216196A1 (de) * 2012-09-12 2014-03-13 E.G.O. Elektro-Gerätebau GmbH Pumpe
WO2014198427A1 (fr) 2013-06-14 2014-12-18 E.G.O. Elektro-Gerätebau GmbH Pompe
EP2862494A1 (fr) * 2013-10-14 2015-04-22 E.G.O. Elektro-Gerätebau GmbH Appareil ménager véhiculant de l'eau
US20170302133A1 (en) * 2016-04-15 2017-10-19 Bühler Motor GmbH Electric motor with a plastic housing
DE102019206203A1 (de) * 2019-04-30 2020-11-05 E.G.O. Elektro-Gerätebau GmbH Wasserführendes Haushaltsgerät

Also Published As

Publication number Publication date
DE102021205247A1 (de) 2022-11-24
US20220372988A1 (en) 2022-11-24
CN115370584A (zh) 2022-11-22
KR20220158208A (ko) 2022-11-30

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