EP1386575A1 - Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung - Google Patents

Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung Download PDF

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Publication number
EP1386575A1
EP1386575A1 EP02425497A EP02425497A EP1386575A1 EP 1386575 A1 EP1386575 A1 EP 1386575A1 EP 02425497 A EP02425497 A EP 02425497A EP 02425497 A EP02425497 A EP 02425497A EP 1386575 A1 EP1386575 A1 EP 1386575A1
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EP
European Patent Office
Prior art keywords
sump
microfilter
dishwashing machine
machine according
filter
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
EP02425497A
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English (en)
French (fr)
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EP1386575B1 (de
Inventor
Silvano Fumagalli
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Candy SpA
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Candy SpA
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Publication date
Application filed by Candy SpA filed Critical Candy SpA
Priority to EP20020425497 priority Critical patent/EP1386575B1/de
Priority to DE2002606490 priority patent/DE60206490T2/de
Publication of EP1386575A1 publication Critical patent/EP1386575A1/de
Application granted granted Critical
Publication of EP1386575B1 publication Critical patent/EP1386575B1/de
Anticipated expiration legal-status Critical
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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
    • A47L15/4202—Water filter means or strainers
    • A47L15/4206—Tubular filters
    • 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
    • A47L15/4227—Arrangements or adaption of recirculation or discharge pumps with macerator arrangements for chopping entrained food particles

Definitions

  • This invention pertains to a dishwashing machine with macerator filter caused to rotate by the wash liquid flow.
  • the first requirement is to have reduced consumption of water and detergent, hence of heating power, in the hot washing stages.
  • the water used in the different stages of a washing cycle (that may include, in this sequence, subsequent stages of prewash, wash, 1 st rinse, 2 nd rinse) is recirculated.
  • the washing tub is filled with a given volume of liquid, generally ranging 1 to 1.5 litres, next the latter is conveyed by a pump to one or several spray arms placed in the wash chamber.
  • the jets flowing out of the arms spray all over the dishes, the water falls within the tub, and is collected in a pan or sump. From there it is sucked out again by the recirculation pump.
  • the volume of water used in each stage cannot be less than a given amount: actually, it must be ensured that the recirculation circuit is filled up completely (this circuit has a remarkable capacity, mainly due to the collection pan size) in order to prevent pump cavitation.
  • Water recirculation permits to remove by dish spraying the food soil present on them.
  • it calls for use of filters, to prevent soil from being recirculated as well. This might damage the recirculation pump and re-soil the dishes .
  • Two cascaded filters are generally used: one large-meshed, retaining the larger sized (>1-2 mm)food soil particles, the other one fine-meshed, the so-called microfilter, retaining the finer particles (ranging 0.2 to 0.3 mm).
  • the large-meshed filter if appropriate connected with a small filter-basin, makes up the top closure of the collection sump, whereas the microfilter is housed inside the sump, upstream the recirculation pump.
  • Both the large-meshed filter and the microfilter are removable for hand cleaning, even if, as we will see, microfilter self-cleaning systems have been developed.
  • microfilter fitted within the recirculation circuit produces considerable loss of pressure and it can even get clogged. This may block or significantly limit the recirculation flow.
  • the most frequently adopted solution provides for splitting the recirculation flow: only part of the flow passes through the microfilter, the rest is directly sucked by the recirculation pump, only passing through the large-meshed filter.
  • the vortex produced in the liquid causes - at least in theory - the filter to rotate.
  • This invention solves all the above mentioned problems and provides for a dishwashing machine with extremely reduced volumetric capacity of the recirculation circuit, removable microfilter automatically cleaned in counterflow to the recirculation flow and caused to rotate by the recirculation flow throughout the duration of the washing and rinsing stages, so to evenly distribute the soil deposit onto the microfilter.
  • the torque acting onto the filter is large enough to enable the latter to macerate and emulsify the soil particles passing through the large-meshed filter; the soil particle size is thus considerably reduced.
  • the particles, reduced in size, once retained by the microfilter, are less likely to develop lumps and can be more easily detached from the filter meshes and kept in suspension in the liquid that is drained, without forming films, specially fat ones, adhering to the walls.
  • Reduction in particle size also involves reduction in particle size distribution provoked by the different density of the suspended particles, and hence the agglomeration of several particles of the same type.
  • Maceration ultimately has a synergetic effect on the use of a microfilter, in that it promotes self-cleaning, calling for less mechanical action to remove soil particles from the filter.
  • Figure 1 shows a schematic overall drawing of a dishwashing machine that, except the special features that will be stated, can be regarded as known art, such as for instance the one disclosed in IT-1,197,983 and EP-752,231.
  • the machine includes a wash chamber 1 ending at the bottom with a tub 2 extending below to form a collection sump 3, generally of a cylindrical form, with diameter ⁇ B ranging 100-120 mm and depth ranging 80-100 mm.
  • a given volume of water (approx. 1,2-1,5 litres) is admitted into the sump through an inlet valve 4, an air jump separator 5, required to comply with safety regulations, a resin water softener 6, and a supply pipe 7. This water fills the sump and the washing tub up to a L1 level.
  • a large-meshed filtering plate 11 is placed in tub 2, the former aimed at separating collection sump from the wash chamber.
  • the filtering plate 11 can be equipped, at the sump, of a recess in the form of a basin, generally removable, in which the coarser fraction of the solid residues settle down.
  • a fine-meshed filter 12 or microfilter generally of a cylindrical form, housed in sump 3.
  • This microfilter divides the sump volume in a center cylindrical section, and in a cylindrical annular crown.
  • the recirculation flow passing through filtering plate 11 partly enters the annular crown and partly flows into the center cylindrical section. Next it is sucked by the suction pump.
  • microfilter 12 The liquid entering the central section and sucked by the pump passes through microfilter 12 from the inside to the outside and undergoes an additional filtration, whereas the liquid entering the circular crown is not further filtered, and conveys in itself the finest solid particles. However, during the subsequent recirculation this liquid as well, mixed with that further filtered, ends up passing through the microfilter, so that the whole recirculation flow is filtered by the microfilter, onto the wall of which the finest soil particles are deposited.
  • the coarsest particles, if present, are collected in the basin of filtering plate 11.
  • the clean water jet from pipe 7 is adequately oriented in order to hit the filtering wall.
  • the filter is rotably mounted within the sump, and is caused to rotate by same spraying jet. Accordingly, the whole filtering wall is sprayed and passed through in countercurrent by the jet.
  • drain pump 10 Even when drain pump 10 is not operative, to fill the internal volume of microfilter, the liquid present into the sump must pass through it in countercurrent, thus it tends to remove soil from the microfilter and to place it in suspension.
  • a rotably supported filter also provides an additional benefit: whenever during a washing cycle the filter may take a shifted position, different from the subsequent stages of the cycle, a more even distribution of the soil particles on the filtering wall can be achieved.
  • Patent EP-752,231 proposes to exploit the vortex induced within sump 3 by the recirculation flow suctioned through an orifice placed tangent to the circumferential wall of the sump.
  • the action of the vortex proves inadequate to consistently produce this effect. Also, for the vortex to be produced, it is required to make use of a suitably sized sump, that increases the volumetric capacity of the recirculation circuit, calling for a larger volume of supply water and hence larger consumption.
  • this invention provides substantial enhancement: it cannot be denied that besides a possible vortex effect there is, in the sump, an axial flow from the top to the bottom, with an average speed determined by the flow rate of the recirculation pump and by the sump cross-section.
  • the pump flow rate typically ranges 80 to 120 litres/minute.
  • the value of 90 litres/minute equal to 1.5 l/s.
  • the average rate of the axial flow provoked by the recirculation pump is approximately equal to 0.15 m/s, provided that the diameter ⁇ B of the sump is equal to 120 mm. Nevertheless, it increases to approximately 0.3 m/s if diameter ⁇ B is reduced to 80 mm, and even to over 0.5 m/s if the diameter is reduced to 60 mm.
  • the axial flow mainly concentrates in the annular crown outside the filter, it is clear that - even with a sump diameter equal to 80 mm and a microfilter diameter indicatively equal to 60 mm, the axial velocity of the flow in the annular crown must range 0.3 m/s to 0.54 m/s and the closer to the upper limit, the larger the microfilter resistance to passing through it.
  • the average axial velocity of the flow into the annular crown is approximately equal to 0.4 m/s. This value increases, besides with the degree of microfilter clogging, along the axial direction of the sump, from the top to the bottom, except in the bottom area where the suction orifice opens up, where the average axial velocity becomes less meaningful, and where incidentally the average speed of the suctioned flow is much larger and is a function of the suction orifice diameter.
  • microfilter rotation is ensured.
  • the rotating microfilter can also act as an emulsifying food soil macerator.
  • FIG. 2 an exploded perspective view, partly in diametral section, relevant to the concerned machine components only, identified by the same number references already used in Fig.1 shows a preferred embodiment of the invention 1.
  • the washing tub in the shape of a large tapered funnel, develops at its bottom section in a cylindrical sump 3, with smaller diameter than the conventional one, preferably approximately equal to 80 mm.
  • Depth H of sump is approximately the same, preferably somehow larger, for instance 100 mm.
  • the sump houses a cylindrical microfilter 12, consisting of a stiff frame formed by two end rings 121,122, joined by vertical uprights 123. Frame supports a cylindrical fine-meshed wire netting 124.
  • the frame can be easily made by plastic material moulding.
  • the filtering wire mesh made of metal or plastic, is fixed to frame by bonding or hot-sealing.
  • Two or more helical blades 125 preferably made of metal (or plastic as well), with outside diameter preferably slightly less than the sump, in order to form with the sump walls a given gap, preferably ranging 0.2 to 0.3 mm, and anyway not exceeding 0.5 mm, are fitted around the external circumference of the frame.
  • Blades 125 as well can be secured to frame by bonding, hot-sealing or forced fitting into special slits machined into uprights 123.
  • blades are adequately designed with a shape such as to provide maximum efficiency and maximum rotation speed.
  • a peripheral speed coefficient can be achieved, larger than 2, and hence a rotation speed even up to 300 r.p.m.
  • the outside diameter of microfilter frame can be 60 mm.
  • the bottom of sump 3 features a circular recess 14 with diameter slightly exceeding the frame outside diameter, designed for free housing of the frame bottom ring 12 forming with the latter a labyrinth sealing.
  • sump extends below to form a pan 15 in which a drain hole 16 is provided for connection with the drain pump.
  • Pan 15 can be cylindrical and closed at the bottom, as shown, or also hemispherical.
  • Drain hole 16 can be placed on the circumference of pan, as shown, or onto the bottom, or at any intermediate position as well.
  • a similar recirculation connection 17 with the recirculation pump is provided at the bottom of the circumferential sump wall.
  • connection axis is oriented tangent to the sump.
  • connection 17 without substantial changes in direction and with minimum pressure loss.
  • microfilter Since microfilter is subject to an axial recirculation flow, due to the interference of blades 125 with the flow, it is subject to a relatively high axial thrust, ranging several hundred grams. At the same time microfilter is also subject to a tangential thrust of the same order of magnitude, that causes it to rotate ( with blades arranged as shown in Figure 2 in the direction pointed by arrow 30). To avoid that the axial thrust locks, due to friction, the microfilter in the circular groove 14, microfilter does not rest into the groove. It is instead supported and centered within the sump by a support pin 18, the end of which fits into a mating seat 19 of a spoked support 20, integral with the lower ring 122 of microfilter, and coupled to the latter by forced fitting or hot sealing.
  • Support 21 should be preferably made of hard metal, i.e. stainless steel, for the reasons that will be hereinafter considered.
  • Drive pin 22 is fitted into a driving recess 23 of a filter-basin 24 equipped with a pair of diametrically opposed indented arms 25,26, for snap-on removable securing filter-basin 24 to the mouth of sump 3.
  • the sump mouth has suitable recesses 27,28 for fitting-in the indented ends of arms 25,26.
  • Snap-on engaging the indented arms into the applicable recesses ensures exact positioning, both axis and center-related, of the basin onto the sump, and accordingly of microfilter within the sump.
  • basin 24 can be fitted with additional, circumferentially distributed arms, partly engaging the sump, thus ensuring perfect centering.
  • the latter arms are complete with a shoulder for resting onto the edge of tub 2.
  • the assembly is completed by a filtering plate 11 resting onto the bottom of the wash tub 2,thus developing a space in-between.
  • the filtering plate features a central opening, flanged to accommodate the filter-basin 24, matched to plate, superimposed to the latter and forming with it a sealing labyrinth.
  • a catch lug 27, integral with filter-basin 27, provides for easy removal and subsequent microfilter pull-out of sump, for possible check and cleaning, with no need for removal of plate 11.
  • filter-basin 24 can even make up a single piece with filtering plate 11.
  • the latter as well can be made of hard metal, such as stainless steel.
  • microfilter blades 125 when microfilter is caused to rotate by the recirculation flow: coarse food soil particles passing through filtering plate 11, and the peripheral section 29 of filter-basin 24 and are conveyed by recirculation flow into sump 3, and namely into the cylindrical annular crown enclosed between the sump wall and the filtering wall 124 of microfilter, are somewhat cut by the leading edge of blades 125.
  • the high speed of the flow outside the microfilter also promotes the drawing of a flow passing through the microfilter, from its inside to the outside.
  • the food soil particles progressively accumulating onto the microfilter filtering wall feature as an average a very small size, and can be more easily removed, brought into suspension and cleared out by the countercurrent flow developing during draining of the washing and rinsing water.
  • the draining of the salt solution can take place at the same time as the liquid admittance (in which case the admitted volume is based on the measurement of the admission time duration) or immediately thereafter (in which case the admitted volume is based on the measurement of the filling level).
  • This volume of liquid can be used for further microfilter cleaning.
  • the inlet duct 7 in pan 3 can be caused to rotate by the thrust of the incident jet (in the same direction of rotation enforced by the axial flow, or preferably in the direction opposed thereto) in order to progressively expose different parts of the filtering wall to the incident jet passing through the wall in countercurrent , and thus cleaning it evenly.
  • the turbulence effect adds, provoked by the rotation of the filter on the volume of liquid inside the microfilter. This turbulence detaches the food soil particles from the filtering wall, and brings them into suspension, so that they are cleared out with the immediately subsequent drain-off.
  • pan 3 can be truncated-cone shape, with smaller diameter at the bottom and microfilter blades designed accordingly.
  • the filtering wall of microfilter as well can be truncated cone in shape.
  • microfilter support pin 18 can be replaced by a pin passing through the full axial length of microfilter, or a part thereof, supporting microfilter by means of a shoulder placed either at the base, at the top or at both positions.
  • Filter-basin 24 can extend with its peripheral wall 29 and its bottom 28 inside microfilter 12.
  • pin 18 supporting the microfilter 12 is hollow, and complete with spraying nozzles 31,32. It acts as inlet duct of the washing water that, in this case, sprays microfilter in the same direction of the recirculation water flow.
  • filter-basin 24 is replaced by a cylindrical or truncated-cone extension 33 of filtering plate 11, partly protruding into microfilter 12, down to a large-meshed filtering plate 34, integral with microfilter.
  • Plate 34 replaces the spoked support.
  • a blade 35 is arranged above plate 34, integral and rotating with microfilter. With its rotation, the latter crushes the soil particles that are collected in the cylindrical extension. This enables particles to pass through plate 34 and to gather within pan 15 (or to be catched by the microfilter).
  • microfilter acts as collection filter-basin.
  • blade 35 can be integral with extension 33: in this case, the relative motion between solid particles and crushing blade is provoked by the rotation of the plate and the vortex induced by the latter.
EP20020425497 2002-07-31 2002-07-31 Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung Expired - Fee Related EP1386575B1 (de)

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Application Number Priority Date Filing Date Title
EP20020425497 EP1386575B1 (de) 2002-07-31 2002-07-31 Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung
DE2002606490 DE60206490T2 (de) 2002-07-31 2002-07-31 Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung

Applications Claiming Priority (1)

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EP20020425497 EP1386575B1 (de) 2002-07-31 2002-07-31 Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung

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EP1386575B1 EP1386575B1 (de) 2005-10-05

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