EP3545812A1 - Lave-vaisselle, en particulier lave-vaisselle électroménager - Google Patents

Lave-vaisselle, en particulier lave-vaisselle électroménager Download PDF

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Publication number
EP3545812A1
EP3545812A1 EP19163584.6A EP19163584A EP3545812A1 EP 3545812 A1 EP3545812 A1 EP 3545812A1 EP 19163584 A EP19163584 A EP 19163584A EP 3545812 A1 EP3545812 A1 EP 3545812A1
Authority
EP
European Patent Office
Prior art keywords
pump
dishwasher
axial
dishwasher according
impeller
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.)
Granted
Application number
EP19163584.6A
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German (de)
English (en)
Other versions
EP3545812B1 (fr
Inventor
Volker Marks
Walter Assmann
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
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Miele und Cie KG
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Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP3545812A1 publication Critical patent/EP3545812A1/fr
Application granted granted Critical
Publication of EP3545812B1 publication Critical patent/EP3545812B1/fr
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Classifications

    • 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
    • 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
    • A47L15/4202—Water filter means or strainers
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning

Definitions

  • the invention relates to a dishwasher, in particular in the embodiment of a domestic dishwasher, with a washing compartment providing a washing compartment, which serves to receive items to be cleaned, a collecting pot, in which the washing fluidly opens and a circulation pump, the fluidically to the collecting pot by means of a suction line connected.
  • Dishwashers of the type described above are well known from the prior art, which is why it does not require a separate documentary proof at this point.
  • Dishwashers of the generic type have a washing container, which provides a washing compartment.
  • This washing compartment is accessible on the user side via a charging opening which can be closed in a fluid-tight manner by means of a pivotally mounted flushing door.
  • the washing container serves to receive items to be cleaned, which in the case of a domestic dishwasher may be, in particular, dishes, cutlery pieces and / or the like.
  • the dishwasher For loading of items to be cleaned with rinsing liquid, the so-called rinsing liquor, the dishwasher has a scavenging chamber side formed spray.
  • This spraying device generally provides rotatably mounted spray arms, with typically two or three such spray arms being provided. In accordance with the intended use, a loading of items to be cleaned with rinsing liquor takes place by means of rotating spray arms.
  • a circulating pump is provided, which is fluidly connected on the one hand to the collecting pot and on the other hand to the spray arms.
  • flushing liquor discharged from the spraying device accumulates in the collection pot, into which the flushing tank flows opens.
  • the circulating pump conveys the rinsing liquor accumulating in the collecting pot to the spray arms of the spraying device, from where then a discharge of the washing liquor takes place in the direction of the items to be cleaned.
  • dishwashers of the type described above have proven themselves in everyday practice, there is room for improvement. So it is particularly desirable to minimize the water and energy consumption in the intended use case on. It is therefore an object of the invention to develop a generic dishwasher constructively to the effect that in the intended use, a reduced water and / or energy consumption is reached.
  • the invention proposes a dishwasher with the features of claim 1.
  • the circulating pumps typically used in the prior art are radial pumps.
  • an axial pump is used as a circulation pump.
  • a circulating pump constructed according to the prior art as a radial pump has an impeller which sucks the rinsing liquor from the collecting pot parallel to the pump shaft and discharges it radially to the pump shaft from the pump impeller.
  • centrifugal forces arise which, in interaction with a guide wheel, which is typically adjacent to the pump impeller, lead to an increase in pressure within the wash liquor.
  • a guide wheel which is typically adjacent to the pump impeller, lead to an increase in pressure within the wash liquor.
  • For a drive of the pump shaft and thus also carried by the pump impeller typically serves an asynchronous motor, which provides a rated speed of almost 3000 U / min available.
  • radial pump circulation pump In order to be able to deliver the pressure increase required in the intended use case of the dishwasher at simultaneous achievement of the required volume flow at such an output speed of a typically used asynchronous, it is imperative to use a designed as a radial pump circulation pump. Because the centrifugal forces arising in a radial pump through the flow deflection ensure a required for the intended use case of the dishwasher Volume flow for a corresponding increase in pressure. For this reason, radial pumps are used as circulating pumps according to the prior art, whereby usually the pressure increases between 10 4 and 10 5 Pa, the volume flows between 10 l / min and 250 l / min and the impeller speed between 1000 U / min and 4000 Rpm.
  • a radial pump is not without detriment to use in a dishwasher.
  • the guide wheel provided for increasing the pressure is arranged typically around the outside of the impeller, with the result that the pump has an overall relatively large diameter. Dishwasher side is therefore a correspondingly large space to provide.
  • dead volume has an effect on adjusting the intended use case of the dishwasher water consumption, because the impeller receiving pump housing must be completely filled with rinsing liquor for proper operation of the pump, which rinse the actual rinsing process is not available.
  • the spent rinsing liquor After completing a washing program, the spent rinsing liquor must be pumped off. Due to the dead volume but only a partial emptying of the pump takes place when pumping the rinsing water. This is because the emptying of the pump is typically done via the intake manifold. The rinsing fluid located inside the pump below the intake nozzle can not be pumped off and therefore remains in the pump and is carried off until the next rinse cycle. In this case, the entrained rinsing liquor corresponding to the dead volume is comparatively large, which is perceived as disadvantageous.
  • the structurally related to a radial pump amount of wash liquor to perform a purge intended affects not only in terms of water consumption disadvantageous, but also energetically. Because for the implementation of a purge intended purge it requires the heating of the rinsing liquor, wherein the heating energy required for this purpose also increases with increasing water consumption.
  • the washing room opens into a collecting pot.
  • the rinsing liquid sprayed in the intended use case by the spraying device accumulates in the collecting pot, from where it is fed to the circulating pump.
  • the rinsing liquor quantity required for continuous and stable pump operation also depends inter alia on the suction depth of the circulating pump. For this reason, it is also preferable to arrange the circulating pump as low as possible in the existing installation space, wherein the space is limited downwards by the so-called floor pan.
  • the circulation pump designed according to the invention as an axial pump in contrast to a radial pump serving as a circulation pump, requires a comparatively small installation space.
  • This has the advantage that the suction depth can be formed larger than in a comparable radial pump in a circulating pump designed as an axial pump.
  • An axial pump therefore does not operate according to the principle of centrifugal force, which is why the stator is not arranged around the outside of the impeller, but is positioned behind it in the conveying direction. As a result, this results in a reduced pump diameter, which in turn allows the pump connection to the collecting pot to be moved further downwards in the direction of the bottom trough, which leads to an increased suction depth in comparison with the prior art.
  • the increase in the intake depth achieved with the embodiment according to the invention results in a reduced water consumption in comparison with the prior art. Because for a proper pump operation due to the increased suction depth only a reduced amount of water is required. This effect is synergetically also supported by the fact that an axial pump, in contrast to a radial pump is not prone to air bubbles located in the wash liquor. The air inclusions received by the rinsing liquor as a result of bubble formation in the collecting pot are harmless for the proper operation of the circulation pump designed as an axial pump, in contrast to a radial pump used as a circulating pump, which makes it possible to adjust the liquid level in the collecting pot in the intended application reduced Spülflottencommun lower even further down.
  • the design according to the invention therefore makes it possible to constructively reduce the minimum amount of water required for proper flushing operation, which not only reduces water consumption, but also requires reduced heat energy for heating the flushing liquor to a target temperature which is desirable to achieve in flushing operation.
  • the impeller speed is selected so that the specific speed of the circulating pump, also called Radformkennetti,> 120, preferably> 125, more preferably> 130.
  • the asynchronous motors used according to the prior art are not suitable. It is therefore proposed with the invention according to another feature that the circulating pump designed as an axial pump cooperates with a synchronous motor, in particular a brushless DC motor or preferably an electronically commutated synchronous motor. Such a drive motor provides the advantage of a high speed, and this at the same time comparatively small size. In combination with the compared to a radial pump smaller dimensioned axial pump results in synergetic manner according to the embodiment of the invention a more compact overall design of the pump-motor assembly, so that a total of less space for proper housing within the dishwasher is needed.
  • the impeller speed is e.g. at about 12,000 rpm, in which case a wheel shape index of 134 results.
  • the housing diameter of a corresponding radial pump is about 100 mm
  • the housing diameter of an axial pump is only about 30 mm.
  • This achieved with the inventive design in contrast to the prior art reduction of the pump housing diameter can be used advantageously to increase the suction depth of the circulation pump, whereby the water consumption of the dishwasher is significantly reduced.
  • designed as an axial circulation pump unlike a designed as a radial pump circulation pump can be positioned lower due to the reduced housing dimensions in the existing space of the dishwasher, which increases the suction depth of the pump.
  • the intake depth of a typical radial pump designed as a circulating pump is about 70 mm.
  • An equivalent in capacity and pressure increase axial pump allows an increase in the suction depth by about 35mm to 105mm, which is a significant reduction in water consumption in the intended use case of the dishwasher entails.
  • the embodiment according to the invention thus provides without loss of efficiency a reduced water consumption while saving energy.
  • the housing diameter usually does not exceed the diameter of the suction-side Saugstutzens. Since the discharge of the pump when pumping via the suction port, the pump housing can be completely emptied, so that no rinsing liquor is dragged into the next rinse.
  • the reduced in an axial pump in contrast to a radial pump size of the pump housing also has the advantage of a reduced dead volume. This also has a positive effect on water consumption.
  • a circulating pump designed as an axial pump produces foamy, i. Gas-containing rinse liquor can promote without loss of efficiency.
  • the axial impeller is less sensitive to dirt or clogging. While in a radial pump a cover plate is required, the impeller designed as an axial pump circulation pump may preferably be formed without cover plate, whereby the blade channel is open so that fibrous dirt from the blade lugs can slip into the housing gap. There it is then possibly crushed and further promoted, so that it can not come to an imbalance or a drop in the delivery pressure.
  • axial pumps operate at a comparable hydraulic operating point, in contrast to radial pumps of higher rotational speed. With the same shaft power, the torque is inversely proportional to the speed and therefore significantly lower. Since the size of motors depends not on the power but on the torque, drive motors for axial pumps can be dimensioned much smaller.
  • Another big advantage of an axial pump compared to a radial pump is also in that an axial pump in the direction of impeller rotation can be reversed, which leads to a reversal of the conveying direction of the washing liquor.
  • Such a reversal of the conveying direction is not possible with radial pumps due to the centrifugal force principle used in radial pumps.
  • an axial pump possibility of conveying direction reversal can be used in particular to cause a Spülflotten Weg Installation, for example, for an automated filter backwashing.
  • the circulation pump is carried by a bottom trough and having an axial impeller arranged on a motor-driven shaft, wherein the shaft, which is preferably aligned parallel or substantially parallel to the bottom trough, or the axis of the axial impeller in one Distance from 10 mm to 50 mm, preferably from 15 mm to 40 mm, more preferably from 20 mm to 30 mm to the bottom pan is arranged.
  • the impeller is disposed within a pump housing, wherein the suction line has an inner diameter of 20 mm to 80 mm, preferably from 25 mm to 60 mm, more preferably from 30 mm to 50 mm.
  • the suction line without or at least substantially changes in diameter in the intake manifold of the pump over.
  • the pump housing adjoining the intake manifold preferably has identical or nearly identical dimensions to the intake manifold, thus providing an inner diameter identical or at least almost identical to the intake manifold and preferably also to the intake manifold.
  • the dead volume is significantly reduced compared to a radial pump.
  • a complete emptying of the pump is possible.
  • the reduced size compared to a radial pump design makes it possible to increase the suction depth compared to a radial pump, as already described above.
  • Fig. 5 can be seen in a purely schematic representation in side view of a dishwasher 1 according to the prior art.
  • the dishwasher 1 has a housing 2 which accommodates a washing container 3.
  • the washing container 3 in turn provides a washing compartment 4 for receiving items to be cleaned.
  • the washing compartment 3 has a charging opening 16.
  • This charging opening 16 can be closed in a fluid-tight manner by means of a flushing door 17, wherein the washing compartment door 17 is rotatably pivotable about a horizontally extending pivot axis.
  • the dishwasher 1 When used as intended, the dishes to be cleaned are treated with rinsing liquor, for which purpose the dishwasher 1 has a spraying device 6.
  • the spray device 6 includes an upper spray arm 7 and a lower spray arm 8.
  • the spraying device 6 is fluidly connected by means of a supply line 11 to a circulation pump 9, by means of which the spray arms 7 and 8 of the spraying device 6 are supplied with rinsing water in the case of a rinsing operation.
  • the circulation pump 9 is connected by means of a suction line 10. Fluidtechnisch is between the collecting pot 5 and the washing compartment 4 a in Fig. 5 Screening device not shown arranged.
  • the rinsed in the intended use case of the circulation pump 9 rinse water passes from the collection pot 5 via the suction line 10, the circulation pump 9 and the supply line 11 in the direction of arrow 14 to the spray arms 7 and 8 of the sprayer 6. From here, the rinsing liquor in the direction of Arrows 18 delivered to the items to be cleaned, from which it then drips and accumulates again after passing through the sieve in the collecting pot 5.
  • a sewer pipe 13 including a drainage pump 12 is connected to the collecting pot 5. After completion of a purge operation carried out as intended, located in the collecting pot 5 and no longer needed flushing solution can be pumped by the drain pump 12 in the direction of arrow 15 and transferred to a sewer system not shown in detail.
  • the circulating pump 9 according to the prior art is a radial pump.
  • the embodiment according to the invention as circulation pump 9 provides an axial pump, as can be seen from the representation of the dishwasher according to the invention Fig. 1 results.
  • Fig. 1 has designed as an axial pump circulation pump 9 via a pump housing 24, which is connected with respect to the flow diameter preferably without offset to the intake passage 10 fluidly.
  • a Axiallaufrad 20 is arranged within the pump housing 24, which is about a shaft 21 in operative connection with a drive motor 22.
  • the shaft 21 pierces the pump housing 24 or the supply line 11 depending on the embodiment, wherein for reasons of tightness a corresponding Shaft seal is provided., Which is not shown in detail in the figures.
  • Fig. 2 lets the construction of the designed as an axial pump circulation pump 9 recognize in detail.
  • the pump housing 24 provides a suction side 25 and a pressure side 26.
  • the suction side of the axial impeller 20 is arranged so that in the normal operation of the feed of the supply line 11 with rinsing a flow direction corresponds to the arrow 29, whereby the funded by the axial flow rinse from the suction side 25 to the pressure side 26 passes.
  • the axial impeller 20 is followed by a stator 27, which is fixedly arranged on a hollow shaft 28.
  • the hollow shaft 28 receives the drive shaft 21, which serves the operative connection between the motor 22 and axial impeller 20.
  • an axial pump does not operate on the centrifugal force principle, which makes it possible to change the conveying direction of the axial pump by reversing the impeller rotation.
  • the flow direction 29 can thus be reversed if necessary by reversing the impeller rotation, in which case the pressure side 26 to the suction side and the suction side 25 to the pressure side.
  • Such a direction of conveyance reversal can be used, for example, to be able to backwash a screening device located in the collecting pot 5 for the purpose of automatic cleaning.
  • the housing 2 of a dishwasher 1 closes on the bottom side with the so-called bottom pan 19, also called bottom plate from.
  • the distance A B between the Spül electer founded 23 determines the circumferentially of the collecting pot 5 available space.
  • the suction depth of the axial pump A A ( Fig. 3 ) or the suction depth of the radial pump A R ( Fig. 4 ) results as a distance between the Spül duringer undergraduate 23 and the axis of rotation of the axial impeller 20 (FIG. Fig. 3 ) or the axis of rotation of the radial impeller 30 (FIG. Fig. 4 ).
  • the axial impeller 20 and the radial impeller 30 driving shaft 21 is aligned parallel to the bottom tray 19.
  • the motor 22 rotates at an axial pump compared to a radial pump with increased speed, for example 12000 rpm, in contrast to a typical radial pump speed of e.g. 3500 rpm.
  • an axial pump as a circulating pump instead of a radial pump known from the prior art provides a number of advantages. Above all, it is advantageous that the pump housing of an axial pump with the same efficiency is dimensioned smaller than the pump housing of a radial pump.
  • the inventive design therefore makes it possible to lower the pump in the available space of the dishwasher, i. to form a larger intake depth. As a result, such a reduced water consumption and also a lower energy consumption can be realized. This results in the reduced energy consumption in particular the fact that due to the reduced water consumption less heating energy must be expended.
  • Another advantage of the axial pump is that the dead volume is reduced in comparison to the radial pump and that it is also possible to allow a complete emptying of the pump in the event of pumping off, so that the amount of washing liquor which is dragged into the next rinsing step is minimized.
  • an axial pump allows automatic cleaning of any in the Filtering sieve arranged sieve through backwashing, because an axial pump allows, in contrast to a radial pump, by reversing the impeller rotation direction of the impeller to reverse the direction of pump flow.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Washing And Drying Of Tableware (AREA)
EP19163584.6A 2018-03-27 2019-03-19 Lave-vaiselle, en particulier lave-vaiselle pour le ménage Active EP3545812B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018107261 2018-03-27

Publications (2)

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EP3545812A1 true EP3545812A1 (fr) 2019-10-02
EP3545812B1 EP3545812B1 (fr) 2023-05-24

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EP19163584.6A Active EP3545812B1 (fr) 2018-03-27 2019-03-19 Lave-vaiselle, en particulier lave-vaiselle pour le ménage

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH439981A (de) * 1965-11-09 1967-07-15 Licentia Gmbh Pumpeinrichtung, insbesondere für Geschirr- oder Waschmaschinen
DE9010254U1 (de) * 1990-07-06 1991-10-31 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Geschirrspülmaschine mit einer Motorpumpe
EP0852928A2 (fr) * 1996-12-16 1998-07-15 Whirlpool Corporation Machine à laver la vaisselle avec un bras d'arrosage haut et bas, une pompe de circulation et une pompe de vidange
CN201861600U (zh) * 2010-11-26 2011-06-15 广东格兰仕集团有限公司 节能洗碗机
CN107638153A (zh) * 2017-09-28 2018-01-30 黄文佳 一种方便放置碗筷的洗碗机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH439981A (de) * 1965-11-09 1967-07-15 Licentia Gmbh Pumpeinrichtung, insbesondere für Geschirr- oder Waschmaschinen
DE9010254U1 (de) * 1990-07-06 1991-10-31 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Geschirrspülmaschine mit einer Motorpumpe
EP0852928A2 (fr) * 1996-12-16 1998-07-15 Whirlpool Corporation Machine à laver la vaisselle avec un bras d'arrosage haut et bas, une pompe de circulation et une pompe de vidange
CN201861600U (zh) * 2010-11-26 2011-06-15 广东格兰仕集团有限公司 节能洗碗机
CN107638153A (zh) * 2017-09-28 2018-01-30 黄文佳 一种方便放置碗筷的洗碗机

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