EP3545812B1 - Lave-vaiselle, en particulier lave-vaiselle pour le ménage - Google Patents

Lave-vaiselle, en particulier lave-vaiselle pour le ménage Download PDF

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Publication number
EP3545812B1
EP3545812B1 EP19163584.6A EP19163584A EP3545812B1 EP 3545812 B1 EP3545812 B1 EP 3545812B1 EP 19163584 A EP19163584 A EP 19163584A EP 3545812 B1 EP3545812 B1 EP 3545812B1
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EP
European Patent Office
Prior art keywords
pump
axial
dishwasher
impeller
circulating pump
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
EP19163584.6A
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German (de)
English (en)
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EP3545812A1 (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 of EP3545812A1 publication Critical patent/EP3545812A1/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 form of a household dishwasher, with a washing compartment that provides a washing chamber and is used to hold items to be washed to be cleaned, a collection pot into which the washing compartment flows fluidically, and a circulating pump that is fluidically connected to the collection pot by means of a suction line connected.
  • Dishwashers of the type described above are well known from the prior art, which is why separate printed evidence is not required at this point.
  • Dishwashers of the generic type have a washing compartment that provides a washing area.
  • This rinsing chamber is accessible to the user via a loading opening which can be closed in a fluid-tight manner by means of a pivotably mounted rinsing chamber door.
  • the washing container serves to accommodate items to be cleaned, which in the case of a household dishwasher can be, in particular, crockery, cutlery and/or the like.
  • the dishwasher In order to apply washing liquid, the so-called washing liquor, to items to be washed that are to be cleaned, the dishwasher has a spray device configured on the washing chamber side.
  • this spray device provides rotatably mounted spray arms, with two or three such spray arms typically being provided.
  • the dishes to be cleaned are subjected to washing liquor by means of rotating spray arms.
  • a circulating pump is provided which is fluidically connected to the collection pot on the one hand and to the spray arms on the other hand.
  • the washing liquor released by the spray device collects in the collection pot into which the washing container flows flows.
  • the circulating pump conveys the washing liquor accumulating in the collection pot to the spray arms of the spray device, from where the washing liquor is then released in the direction of the items to be washed.
  • the CN 201861600 U discloses a dishwasher with a washing compartment and a collection pot and a circulating pump connected thereto.
  • the DE 9010254 U1 and the EP 0852928 A2 disclose a dishwasher in which the circulating pump is designed as an axial pump.
  • dishwashers of the type described above have proven themselves in everyday practical use, there is a need for improvement. In particular, efforts are being made to further minimize water and energy consumption when used as intended. It is therefore the object of the invention to improve the design of a dishwasher of this type in such a way that reduced water and/or energy consumption is achieved when used as intended.
  • the circulating pumps typically used according to the prior art are radial pumps.
  • the invention proposes that an axial pump be used as a circulating pump.
  • a circulating pump designed according to the prior art as a radial pump has an impeller which draws in the washing liquor from the collection pot parallel to the pump shaft and discharges it from the pump impeller radially to the pump shaft. This flow deflection creates centrifugal forces which, in conjunction with a guide wheel typically located adjacent to the pump impeller, lead to an increase in pressure within the washing liquor.
  • An asynchronous motor is typically used to drive the pump shaft and thus also the pump impeller carried by it, which provides a nominal speed of just under 3000 rpm.
  • a radial pump is not without disadvantage for use in a dishwasher.
  • the guide wheel provided for increasing the pressure is, as is typical for construction, arranged on the outside around the impeller, which means that the pump has a relatively large diameter overall. A correspondingly large installation space must therefore be made available on the dishwasher side.
  • the used wash water must be pumped out. Due to the dead volume, however, the pump is only partially emptied when the washing liquor is pumped out. This is because the pump is typically emptied via the intake manifold. The washing liquor inside the pump below the suction port cannot be pumped out and therefore remains in the pump and is carried over to the next wash cycle. In this case, the entrained washing liquor is comparatively large in accordance with the dead volume, which is perceived as disadvantageous.
  • the amount of rinsing water required by the design to carry it out an intended rinse cycle not only has a negative effect in terms of water consumption, but also in terms of energy. This is because the washing liquor has to be heated to carry out a wash cycle as intended, with the heating energy required for this also increasing with increasing water consumption.
  • an axial pump is used as a circulating pump instead of a radial pump, a departure from the prior art. In doing so, the disadvantage is consciously accepted that at a given speed there is a reduced increase in pressure within the washing liquor due to a lack of centrifugal force.
  • the washing compartment opens into a collecting pot.
  • the rinsing liquid sprayed by the spray device when used as intended collects in the collection pot, from where it is fed to the circulating pump.
  • the amount of rinsing water required for continuous and stable pump operation also depends, among other things, on the suction depth of the circulating pump. For this reason, it is also preferred to arrange the circulating pump as low as possible in the available installation space, with the installation space being limited at the bottom by the so-called floor pan.
  • the circulating pump designed according to the invention as an axial pump requires a comparatively small installation space in contrast to a radial pump serving as a circulating pump.
  • This has the advantage that the suction depth can be greater in a circulating pump designed as an axial pump than in a comparable radial pump.
  • the flow in the impeller of an axial pump is axial on both the inlet and outlet sides, i.e. parallel to the pump shaft.
  • An axial pump therefore does not work according to the centrifugal principle, which is why the guide wheel 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 collection pot to be moved further down in the direction of the floor pan, which leads to an increased suction depth compared to the prior art.
  • the configuration according to the invention therefore makes it structurally possible to reduce the minimum amount of water required for proper washing operation, which not only reduces water consumption, but also reduces the thermal energy required to heat the washing liquor to a target temperature that is desirable to be reached during washing operation.
  • a typical operating point is, for example, a volume flow of 40 l/min delivered by the pump, and this at a pressure increase of 30,000 Pa.
  • the circulating pump designed as an axial pump is designed for an impeller speed of >10000 rpm, preferably >11000 rpm and even more preferably >12000 rpm.
  • the impeller speed is preferably chosen so that the specific speed of the circulating pump, also known as the wheel shape index, is >120, preferably >125, even more preferably >130.
  • asynchronous motors used according to the prior art are not suitable for achieving an impeller speed of >10,000 rpm or a specific speed of >120. It is therefore proposed with the invention according to a further feature that the circulating pump designed as an axial pump interacts with a synchronous motor, in particular a brushless direct current motor or preferably an electronically commutated synchronous motor.
  • a synchronous motor in particular a brushless direct current motor or preferably an electronically commutated synchronous motor.
  • Such a drive motor provides the advantage of a high speed, and at the same time a comparatively small size.
  • the inventive design synergistically results in an overall more compact design of the pump-motor arrangement, so that overall less installation space is required for the intended accommodation within the dishwasher.
  • the impeller speed should be selected at around 12,000 rpm, for example, in which case an impeller shape index of 134 results.
  • the housing dimensions of a radial pump are significantly reduced.
  • the housing diameter of a corresponding radial pump is around 100 mm, whereas the housing diameter of an axial pump is only around 30 mm.
  • This reduction in the pump housing diameter achieved with the configuration according to the invention in contrast to the prior art can advantageously be used to increase the suction depth of the circulating pump, with the result that the water consumption of the dishwasher is significantly reduced.
  • the circulating pump designed as an axial pump can, in contrast to a circulating pump designed as a radial pump, because of the reduced housing dimensions in the existing Space of the dishwasher are positioned deeper, which increases the suction depth of the pump.
  • the suction depth of a circulating pump designed as a radial pump is approximately 70 mm.
  • An axial pump with the same delivery capacity and pressure increase enables the suction depth to be increased by around 35mm to 105mm, which results in a considerable reduction in water consumption when the dishwasher is used as intended.
  • the configuration according to the invention therefore results in reduced water consumption while at the same time saving energy, without sacrificing efficiency.
  • the housing diameter is usually not larger than the diameter of the suction port on the suction side. Since the pump is emptied via the suction nozzle when pumping out, the pump housing can be completely emptied so that no washing liquid is carried over to the next wash cycle.
  • the reduced size of the pump housing in an axial pump compared to a radial pump 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 can convey foamy, i.e. gaseous, rinsing liquor without loss of efficiency.
  • the axial impeller is less sensitive to dirt or blockages. While a cover disk is required for a radial pump, the impeller of the circulating pump designed as an axial pump can preferably be designed without cover disks, whereby the blade channel is open so that fibrous dirt can slip from the blade noses into the housing gap. There it is then, if necessary, comminuted and conveyed onward, so that an imbalance or a drop in the conveying pressure cannot occur.
  • an axial pump compared to a radial pump is that an axial pump can be reversed in the direction of rotation of the impeller, 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.
  • the possibility of reversing the conveying direction provided by an axial pump can be used in particular to bring about a return of the washing liquor, for example for automated filter backwashing.
  • the circulation pump is carried by a base pan and has an axial impeller arranged on a motor-driven shaft, the shaft, which is preferably aligned parallel or essentially parallel to the base pan, or the axis of the axial impeller in one Distance of 10 mm to 50 mm, preferably from 15 mm to 40 mm, more preferably from 20 mm to 30 mm is arranged to the floor pan.
  • the impeller be arranged within a pump housing, with the intake line having an inside diameter of 20 mm to 80 mm, preferably 25 mm to 60 mm, even more preferably 30 mm to 50 mm.
  • the suction line preferably transitions into the suction connector of the pump without or at least substantially changing the diameter.
  • the pump housing adjoining the intake port preferably has dimensions that are identical or almost identical to the intake port, ie it represents one to the intake port and preferably also identical or at least almost identical inner diameter to the intake line.
  • the dead volume is significantly reduced compared to a radial pump.
  • a complete emptying of the pump is possible.
  • the smaller design compared to a radial pump makes it possible to increase the suction depth compared to a radial pump, as has already been described above.
  • FIG. 5 shows a dishwasher 1 according to the prior art in a purely schematic side view.
  • the dishwasher 1 has a housing 2 that accommodates a washing container 3 .
  • the washing compartment 3 in turn provides a washing chamber 4 for receiving items to be washed to be cleaned.
  • the washing compartment 3 has a loading opening 16 for loading the washing compartment 4 with items to be cleaned.
  • This loading opening 16 can be closed in a fluid-tight manner by means of a rinsing chamber door 17, the rinsing chamber door 17 being mounted such that it can rotate about a horizontally extending pivot axis.
  • the items to be cleaned are treated with washing liquor, for which purpose the dishwasher 1 has a spray device 6 .
  • the spray device 6 includes an upper spray arm 7 and a lower spray arm 8.
  • the spray device 6 is fluidically connected by means of a supply line 11 to a circulating pump 9, by means of which the spray arms 7 and 8 of the spray device 6 are supplied with washing liquor in the case of a washing operation.
  • the rinsing container 3 providing the rinsing space 4 opens out with respect to the plane of the drawing figure 5 into a collection pot 5 on the underside.
  • the circulation pump 9 is connected to this collection pot 5 by means of an intake line 10 .
  • an in figure 5 arranged not shown screening device.
  • the rinsing water circulated by the circulating pump 9 when used as intended travels from the collection pot 5 via the intake line 10, the circulating pump 9 and the supply line 11 in the direction of arrow 14 to the spray arms 7 and 8 of the spray device 6. From here the rinsing water is pumped in the direction of the Arrows 18 are released onto the washware to be cleaned, from which it then drips and collects again in the collection pot 5 after passing through the sieve device.
  • a waste water line 13 together with a drain pump 12 is connected to the collection pot 5 .
  • the washing liquor that is no longer required in the collection pot 5 can be pumped out by means of the drain pump 12 in the direction of arrow 15 and transferred to a sewage system, not shown in detail.
  • the circulation pump 9 according to the prior art is a radial pump.
  • the configuration according to the invention provides an axial pump as the circulating pump 9, as can be seen from the illustration of the dishwasher according to the invention 1 results.
  • the circulating pump 9 designed as an axial pump has a pump housing 24 which, in terms of the flow diameter, is preferably seamlessly connected to the intake line 10 in terms of flow.
  • An axial impeller 20 is arranged within the pump housing 24 . This is operatively connected to a drive motor 22 via a shaft 21. Depending on the design, the shaft 21 penetrates the pump housing 24 or the supply line 11, with a corresponding shaft seal being provided for reasons of tightness, which is not shown in detail in the figures .
  • the pump housing 24 provides a suction side 25 and a pressure side 26 .
  • the axial impeller 20 is arranged on the suction side, so that when the supply line 11 is fed with washing liquor during normal operation, the direction of flow corresponds to that of the arrow 29, with the result that the washing liquor delivered by the axial pump reaches the suction side 25 to the pressure side 26.
  • the axial impeller 20 is followed by a guide wheel 27 which is fixedly arranged on a hollow shaft 28 .
  • the hollow shaft 28 accommodates the drive shaft 21 which is used for the operative connection between the motor 22 and the axial impeller 20 .
  • an axial pump does not work according to the principle of centrifugal force, which allows the pumping direction of the axial pump to be changed by reversing the direction of rotation of the impeller.
  • the direction of flow 29 can therefore be reversed if necessary by reversing the direction of rotation of the impeller, in which case the pressure side 26 then becomes the suction side and the suction side 25 becomes the pressure side.
  • Such a reversal of the conveying direction can be used, for example, to be able to backwash a screening device located in the collection pot 5 for the purpose of automatic cleaning.
  • the housing 2 of a dishwasher 1 includes the bottom side with the so-called Bottom pan 19, also called bottom plate, from.
  • the distance A B between the washing container floor 23 determines the installation space available on the peripheral side of the collection pot 5 .
  • the suction depth of the axial pump A A ( 3 ) or the suction depth of the radial pump A R ( 4 ) results as the distance between the washing tank floor 23 and the axis of rotation of the axial impeller 20 ( 3 ) or the axis of rotation of the radial impeller 30 ( 4 ).
  • the shaft 21 driving the axial impeller 20 or the radial impeller 30 is aligned parallel to the floor pan 19 .
  • the distance A between the shaft 21 and the floor pan 19 is the difference between the installation space height AB and the suction depth A A with respect to the axial pump and A R with respect to the radial pump.
  • the suction depth of an axial pump is significantly increased compared to the suction depth of a radial pump, which also results in a reduced distance A between the shaft 21 and the floor pan 19 .
  • the increased suction depth in an axial pump compared to a radial pump results from the fact that the dimensions of the pump housing of an axial pump are significantly reduced compared to those of a pump housing of a radial pump. It is therefore permitted to position the axial pump lower in the available installation space, i.e. to reduce the distance A between the axis of rotation of the drive shaft and the floor pan 19 and thus to increase the distance to the flushing tank floor 23, i.e. to increase the suction depth of the pump.
  • the motor 22 in an axial pump rotates at a higher speed than in a radial pump, for example at 12000 rpm in contrast to a typical radial pump speed of 3500 rpm, for example. at least
  • 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 is dimensioned smaller than the pump housing of a radial pump with the same degree of efficiency.
  • the configuration according to the invention therefore makes it possible to arrange the pump deeper in the available installation space of the dishwasher, ie to form a greater suction depth. As a result, reduced water consumption and also lower energy consumption can be realized. The reduced energy consumption results in particular from the fact that less heating energy has to be expended due to the reduced water consumption.
  • Another advantage of the axial pump is that the dead volume is reduced compared to the radial pump and that it is also possible to allow the pump to be completely emptied in the event of pumping out, so that the amount of washing liquor that is carried over to the next washing step is minimized.
  • an axial pump enables any sieves in the collection pot to be automatically cleaned by backwashing, because an axial pump, in contrast to a radial pump, allows you to reverse the direction of rotation of the impeller by reversing the direction of rotation of the impeller.

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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)

Claims (9)

  1. Lave-vaisselle, en particulier lave-vaisselle domestique, comportant un boîtier (2), un récipient de rinçage (3) reçu dans le boîtier (2) et fournissant un espace de rinçage (4), lequel récipient de rinçage sert à la réception d'articles à nettoyer, un bac collecteur (5) dans lequel débouche le récipient de rinçage (3) par communication fluidique, une pompe de recirculation (9) réalisée sous forme de pompe axiale et raccordée par communication fluidique au bac collecteur (5) à l'aide d'un conduit d'aspiration (10), caractérisé en ce
    que le boîtier (2) se termine côté fond par une cuve de fond (19), la pompe de recirculation (9) étant supportée par la cuve de fond (19) et présentant une roue mobile axiale (20) disposée sur un arbre (21) entraîné par un moteur et orienté parallèlement ou sensiblement parallèlement à la cuve de fond (19),
    et l'arbre (21) étant disposé, au moins dans la zone de la roue mobile axiale (20), à une distance (A) de 10 mm à 50 mm par rapport à la cuve de fond (19)
    et/ou
    la profondeur d'aspiration (AA) de la pompe de recirculation (9), laquelle profondeur d'aspiration résulte de la distance entre le fond (23) du récipient de rinçage (3) et l'axe de rotation de la roue mobile axiale (20), étant de 80 % à 90 % de la distance (AB) entre le fond (23) du récipient de rinçage (3) et la cuve de fond (19).
  2. Lave-vaisselle selon la revendication 1,
    caractérisé en ce que
    l'arbre (21) est disposé, au moins dans la zone de la roue mobile axiale (20), à une distance (A) de 15 mm à 40 mm, encore plus préférablement de 20 mm à 30 mm, par rapport à la cuve de fond (19).
  3. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé en ce que
    la roue mobile axiale (20) est disposée à l'intérieur d'un boîtier de pompe (24), le boîtier de pompe présentant un diamètre intérieur de 20 mm à 80 mm, plus préférablement de 25 mm à 60 mm, encore plus préférablement de 30 mm à 50 mm.
  4. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé en ce que
    la pompe de recirculation (9) est conçue pour une vitesse de rotation de roue mobile > 10 000 tr/min, de préférence > 11 000 tr/min, encore plus préférablement > 12 000 tr/min.
  5. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé en ce que
    la pompe de recirculation (9) est conçue pour une vitesse de rotation spécifique > 120, de préférence > 125, encore plus préférablement > 130.
  6. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé par
    un moteur synchrone (22) coopérant avec la pompe de recirculation (9), en particulier un moteur à courant continu réalisé sans balais ou un moteur synchrone à commutation électronique.
  7. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé en ce que
    la profondeur d'aspiration (AA) de la pompe de recirculation (9) est comprise entre 120 mm et 80 mm, de préférence entre 110 mm et 100 mm, encore plus préférablement est de 105 mm.
  8. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé en ce que
    le boîtier de pompe (24) présente une tubulure d'aspiration raccordée par communication fluidique au conduit d'aspiration (10), les diamètres d'écoulement du boîtier de pompe (24) et de la tubulure d'aspiration étant de mêmes dimensions.
  9. Lave-vaisselle selon l'une des revendications précédentes,
    caractérisé en ce que
    la roue mobile de la pompe de recirculation (9) est réalisée sans flasque.
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

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

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528747B1 (de) * 1965-11-09 1970-09-24 Licentia Gmbh Pumpeinrichtung,insbesondere fuer Geschirrspuel- oder Waschmaschinen
DE9010254U1 (de) * 1990-07-06 1991-10-31 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Geschirrspülmaschine mit einer Motorpumpe
DE69721211T2 (de) * 1996-12-16 2003-12-11 Whirlpool Corp., Benton Harbor Geschirrspülmaschine mit einem Ober- und Untersprüharm, einer Umwälzpumpe und einer Entleerungspumpe
CN201861600U (zh) * 2010-11-26 2011-06-15 广东格兰仕集团有限公司 节能洗碗机
CN107638153B (zh) * 2017-09-28 2018-08-07 黄文佳 一种方便放置碗筷的洗碗机

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