EP3312429B1 - Umwälzpumpe für eine geschirrspülmaschine - Google Patents

Umwälzpumpe für eine geschirrspülmaschine Download PDF

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Publication number
EP3312429B1
EP3312429B1 EP17194918.3A EP17194918A EP3312429B1 EP 3312429 B1 EP3312429 B1 EP 3312429B1 EP 17194918 A EP17194918 A EP 17194918A EP 3312429 B1 EP3312429 B1 EP 3312429B1
Authority
EP
European Patent Office
Prior art keywords
sealing element
circulation pump
impeller unit
channel impeller
side space
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.)
Active
Application number
EP17194918.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3312429A1 (de
Inventor
Andreas Hilger
Thomas Lochner
Anne Freitag
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP3312429A1 publication Critical patent/EP3312429A1/de
Application granted granted Critical
Publication of EP3312429B1 publication Critical patent/EP3312429B1/de
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • 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
    • 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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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 approach presented here relates to a circulation pump for a dishwasher.
  • Circulation pumps currently used in series have a gap between a rotating impeller and a fixed counterpart. This area is called “wheel side space” in fluid technology.
  • the medium can flow through this wheel side space from the pressure side to the suction side. This creates a leakage volume flow that reduces the hydraulic efficiency of a pump. By reducing the wheel space, this influence can be reduced, the efficiency increases and thus the energy consumption is reduced.
  • the DE 10116671 A1 discloses a circulation pump for a water-conducting electrical household appliance, comprising a channel impeller unit with a housing element and an inlet unit formed by a trumpet, the housing element and the inlet unit together forming the housing of a wheel side space.
  • the wheel side space of some dishwasher pumps has a continuous gap of 1 mm, which cannot be reduced further in the current manufacturing processes without major manufacturing and / or assembly work or special additional components.
  • so-called floating rings are also known, which can provide a direct seal to the impeller.
  • the DE 19611677 C2 describes a non-contact seal with a floating ring for a flow-through wheel side space of an overpressure turbine.
  • the WO 2008123174 A1 and US RE28742 E disclose a centrifugal pump with a sealing element between a housing element of a channel impeller unit and an inlet unit.
  • the approach presented here is based on the task of creating an improved circulation pump for a dishwasher.
  • a channel impeller unit for a circulation pump for a dishwasher comprises at least one sealing element which extends radially outward from a housing element of the channel impeller unit and is designed to at least partially, in a state mounted with a trumpet of the circulation pump, a wheel side space between the channel impeller unit and the trumpet can be closed reversibly.
  • Circulation pumps in dishwashers are used, for example, to repeatedly pump wash water from the sump to the spray arms.
  • the circulation pump has a rotating part in the form of the channel impeller and an unmoving counterpart.
  • the wheel side space runs between the channel impeller and the counterpart.
  • a part of the duct impeller is referred to as the duct impeller unit.
  • the housing member of the channel impeller unit is the part of the channel impeller unit that is in contact with the wheel side space.
  • An inlet unit of the counterpart has the form of a trumpet, this inlet unit is referred to below as a trumpet, and together with the housing element of the channel unit, it forms the housing of the wheel side space.
  • a sealing element for example shaped as a sealing lip, which extends radially outward from the housing element, the efficiency of the circulation pump can be increased in the installed state of the channel impeller unit in the circulation pump, thereby increasing the energy consumption of the dishwasher in the the circulation pump is installed, is reduced.
  • the sealing element is also advantageously inexpensive and easy to manufacture.
  • the sealing element can advantageously at least partially comprise a sealing lip formed from an elastic material.
  • An elastic material can fit the trumpet precisely to seal the wheel side space in a fluid-tight manner.
  • an elastic sealing lip can be easily removed from the sealing position.
  • the sealing element can be shaped to close one end of the wheel side space.
  • the sealing element can cover an end of the wheel side space shaped as an opening of the wheel side space and thus seal the entire wheel side space.
  • the sealing element can be fixed or fixable to the channel impeller unit by a hinge, in particular the hinge being a film hinge.
  • the Sealing element can be produced, for example, together with the hinge in one piece with the housing element. This enables a simple manufacturing process.
  • a hinge can allow the sealing element to move axially on a support surface on the trumpet.
  • the sealing element is designed to be arranged circumferentially around the housing element of the channel impeller unit. An end of the wheel side space running circularly around the channel impeller can thus be completely sealed. Only a ring-shaped sealing element is necessary.
  • the sealing element is shaped so that it can slide radially on a bearing surface of the trumpet.
  • the sealing element can thus be individually adjustable and in particular also reliably seal the wheel-side space under different prevailing pressure conditions.
  • the sealing element can be injection molded onto the housing element by an injection molding process.
  • An injection molding process can allow simple and inexpensive attachment of the sealing element to the housing element.
  • the sealing element can have at least one slot.
  • the slot can increase the flexibility of the sealing element.
  • the sealing element has a plurality of such slots in order to ensure the flexibility of the sealing element all around.
  • the slot can extend in a radial direction.
  • a radial direction of the slot can ensure, in particular in the case of a sealing element arranged circumferentially around the housing element, that the sealing element can be placed flexibly on the trumpet and the sealing element, for example, does not warp.
  • a circulation pump for a dishwasher has a trumpet and one of the channel impeller units presented.
  • This circulation pump can serve as a replacement for known circulation pumps, with the advantage that the circulation pump presented has an increased efficiency due to the cheaply and easily attachable sealing element and thus consumes less energy.
  • the sealing element of the circulating pump can be shaped to be opened by particles moving through the wheel side space. A passage of dirt particles such as sand can be made possible so that the circulation pump cannot become blocked or blocked.
  • the sealing element can, for example, be attached directly to the housing element, e.g. be injected. However, it can also be connected to the channel impeller unit as an additional component.
  • FIG 1 shows a schematic illustration of a dishwasher 100.
  • the dishwasher has two dishwashing baskets 105 arranged one above the other for receiving dishes.
  • Three spray arms 110 are arranged adjacent to the dish holding baskets.
  • a circulation pump 120 and a drain pump 125 are arranged in an area facing an installation area 115 for installing the dishwasher.
  • the circulation pump 120 is designed to repeatedly pump water that accumulates in a collection pot 130 to the spray arms 110 during operation of the dishwasher.
  • the drain pump 125 is designed to pump dirty water generated after a rinse cycle to a drain 135.
  • Figure 2 shows a section of a schematic cross section of a circulation pump 120, which are used for example in the dishwasher.
  • the section shows in particular the channel impeller unit 200 and the counterpart 205 with trumpet 310.
  • the circulation pump 120 has a channel impeller unit 200 and a counterpart 205.
  • a wheel side space 210 is arranged between the channel impeller unit 200 and the counterpart 205.
  • the channel impeller unit 200 comprises a channel impeller 215 rotating during the operation of the circulation pump 120 Figure 3
  • the channel impeller unit 200 would have a sealing element that would at least partially reversibly close the wheel side space 210.
  • Figure 3 shows a section of a schematic cross section of a circulation pump 120 for a dishwasher according to an embodiment. This can be based on the Figure 2 Circulation pump 120 described act, with the difference that the channel impeller unit 200 of the circulation pump 120 according to this embodiment has the sealing element 300.
  • the sealing element 300 extends radially outward from a housing element 305 of the channel impeller unit 200 and is designed to be in one with a
  • Trumpet 310 of the circulating pump 120 in the assembled state to at least partially reversibly close the wheel side space 210 between the channel impeller unit 200 and the trumpet 310.
  • the sealing element 300 bears against a bearing surface 315 of the trumpet 310 in such a way that the sealing element 300 closes the wheel side space 210 at an end 320 of the wheel side space 210 which is formed as an opening of the wheel side space 210.
  • the sealing element 300 which is elastically shaped in accordance with this exemplary embodiment, enables a flexible reduction of the wheel side space 210 and thus an increase in the efficiency of the circulation pump 120. According to this exemplary embodiment, this is a flexible sealing lip molded sealing element 300 can adapt axially and slide radially on contact surface 315.
  • the circulation pump impeller in the form of the channel impeller unit 200 with a sealable wheel side space 210 is realized by a change in geometry and possibly new materials of an existing component in the form of the housing element 305 of the channel impeller unit 200.
  • the requirements for the components and the medium to be pumped in the presented sealing element 300 are extremely low.
  • no mechanically reworked components and several additional components that represent the sealing geometry are therefore necessary.
  • the contamination of the medium by, for example, sand, etc. can be large without the function of the seal in the form of the sealing element 300 or the pump in the form of the circulating pump 120 being impaired, since the sealing element 300 according to this exemplary embodiment is designed to be inherently particles such as dirt moving through the wheel side space 310 can be opened reversibly.
  • the sealing element 300 Due to the pump internal pressure of the circulation pump 120, the sealing element 300 is pressed against its counterpart in the form of the trumpet 310. The sealing effect is thus increased with increasing delivery capacity. If coarse-grained particles appear in the medium, they can pass through the flexible sealing element 300 without impairing the function of the circulation pump 120.
  • the sealing element 300 is injection molded directly onto the housing element 305.
  • the sealing element 300 is connected to the channel impeller unit 200 as an additional component. The approach presented can be used for any type of pumps with wheel side space 210.
  • Figure 4 also shows a section of a schematic cross section of a circulation pump 120 according to an embodiment. It can be based on the Figure 3 act circulating pump 120 described. An area X is based on Figure 5 shown enlarged.
  • FIG. 5 shows a schematic cross section of a sealing element 300 according to an embodiment. This is based on Figure 4 sealing element 300 shown in reduced size.
  • sealing element 300 connected to the housing element 305 by a hinge 500.
  • a recess 505 is arranged between the housing element 305 and the sealing element 300, as a result of which the sealing element 300 is movable in the direction of the bearing surface 315.
  • the sealing element 300 bears against the bearing surface 315 in a fluid-tight manner.
  • the elastic sealing element 300 is shaped in order to be able to slide radially on the contact surface 315 of the trumpet 310.
  • the sealing element 300 can adapt axially and thus compensate for the manufacturing tolerances.
  • the radial arrangement of the geometry is chosen so that there is no restriction.
  • Figure 6 shows a perspective top view of a channel impeller unit 200 according to an embodiment. It can be based on the Figure 4 described channel impeller unit 200, with the difference that according to this embodiment, the sealing element 300 has a plurality of slots 600.
  • the sealing element 300 is arranged all around the housing element 305.
  • the slots 600 extend in a radial direction, for example at regular intervals, all around the entire sealing element 300.
  • the slots 600 are formed as incisions in the sealing element 300.
  • the sealing element 300 is slotted to increase its flexibility.
  • Figure 7 shows a perspective top view of a sealing element 300 with slots 600 according to an embodiment. This is an enlarged section of the on the basis of Figure 6 described sealing element 300th
  • Figure 8 shows a perspective top view of a channel impeller unit 200 according to an embodiment. It can be based on the Figure 6 described channel impeller unit 200, with the difference that according to this embodiment, the slots 600 do not completely penetrate the sealing element 300. According to this exemplary embodiment, the slots 600 are realized only as notches in the sealing element 300 which are slotted on an upper side 800 of the sealing element 300. An underside 805 of the sealing element 300 is accordingly formed continuously, that is to say without slots 600. The bottom 805 is based on Figure 9 shown.
  • Figure 9 shows a perspective bottom view of a channel impeller unit 200 according to an embodiment. It can be based on the Figure 8 channel impeller unit 200 described. According to this exemplary embodiment, the underside 805 of the sealing element 300 has no slots.
  • Figure 10 shows a flow diagram of a method 1000 for producing a channel impeller unit. This can be a method 1000 for producing one of the channel impeller units described with reference to the previous figures.
  • a step 1005 of providing at least one housing element of a channel impeller unit is provided.
  • at least one sealing element which is designed to at least partially reversibly close a wheel side space between the channel impeller unit and a trumpet of the circulation pump, is attached to the housing element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP17194918.3A 2016-10-21 2017-10-05 Umwälzpumpe für eine geschirrspülmaschine Active EP3312429B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016120067 2016-10-21

Publications (2)

Publication Number Publication Date
EP3312429A1 EP3312429A1 (de) 2018-04-25
EP3312429B1 true EP3312429B1 (de) 2020-03-04

Family

ID=60021980

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Application Number Title Priority Date Filing Date
EP17194918.3A Active EP3312429B1 (de) 2016-10-21 2017-10-05 Umwälzpumpe für eine geschirrspülmaschine

Country Status (2)

Country Link
EP (1) EP3312429B1 (es)
ES (1) ES2781226T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019208727A1 (de) * 2019-06-14 2020-12-17 BSH Hausgeräte GmbH Pumpenimpeller, laugenpumpe, haushaltsgerät und verfahren zum herstellen des pumpenimpellers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE28742E (en) * 1967-10-26 1976-03-23 Pumps capable of use as heart pumps
DE19611677C2 (de) 1996-03-25 1997-09-11 Voith Hydro Gmbh Berührungsfreie Dichtung mit einem schwimmenden Ring
DE10116671B4 (de) * 2001-04-04 2006-04-27 Miele & Cie. Kg Umwälzpumpe mit Heizungseinrichtung
JP2008240655A (ja) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd ポンプの羽根車構造

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3312429A1 (de) 2018-04-25
ES2781226T3 (es) 2020-08-31

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