EP2757930B1 - Lave-vaisselle comprenant un système de séchage - Google Patents

Lave-vaisselle comprenant un système de séchage Download PDF

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Publication number
EP2757930B1
EP2757930B1 EP12780840.0A EP12780840A EP2757930B1 EP 2757930 B1 EP2757930 B1 EP 2757930B1 EP 12780840 A EP12780840 A EP 12780840A EP 2757930 B1 EP2757930 B1 EP 2757930B1
Authority
EP
European Patent Office
Prior art keywords
tub
air
outlet
dishwashing machine
machine according
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
EP12780840.0A
Other languages
German (de)
English (en)
Other versions
EP2757930A1 (fr
Inventor
Gloria Ghezzi
Gianluca Benedetto
Maria Chiara Brugnera
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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
Priority claimed from IT000838A external-priority patent/ITTO20110838A1/it
Priority claimed from IT000841A external-priority patent/ITTO20110841A1/it
Application filed by Indesit Co SpA filed Critical Indesit Co SpA
Priority to EP15192917.1A priority Critical patent/EP3000377B1/fr
Priority to PL12780840T priority patent/PL2757930T3/pl
Publication of EP2757930A1 publication Critical patent/EP2757930A1/fr
Application granted granted Critical
Publication of EP2757930B1 publication Critical patent/EP2757930B1/fr
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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
    • A47L15/48—Drying arrangements
    • A47L15/486—Blower arrangements
    • 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
    • A47L15/48—Drying arrangements
    • A47L15/481—Drying arrangements by using water absorbent materials, e.g. Zeolith
    • 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
    • A47L15/48—Drying arrangements
    • A47L15/483—Drying arrangements by using condensers
    • 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
    • A47L15/48—Drying arrangements
    • A47L15/488—Connections of the tub with the ambient air, e.g. air intake or venting arrangements
    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0034—Drying phases, including dripping-off phases
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/12—Water temperature
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/18—Air temperature
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/19—Air humidity
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/11—Air heaters
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/12—Air blowers

Definitions

  • the present invention relates to a dishwashing machine having a drying system.
  • Drying systems that equip modem-day dishwashers are substantially of a closed-circuit type or open-circuit type; the latter may be subdivided into systems of natural circulation or else systems of forced circulation of the air.
  • a fan sucks the damp air from the tub, and then re-introduces it into the tub after it has been dehumidified.
  • a condenser device or the like is provided between the outlet for the damp air of the tub and the intake mouth of the fan, whilst between the delivery of the fan and the inlet for the air into the tub, a heating resistor may be operative, to render the drying process more efficient (see, for example, FR-A-2491322 ).
  • the tub is also provided with at least one opening aimed at enabling change-over of air, i.e., inlet in a non-forced way into the tub of air coming from the external environment (see, for example, EP-A-0721762 ).
  • a dishwasher the open-circuit drying system of which includes a first fan for introducing in a forced way into the tub drying air taken in from the external environment, said air being previously heated in order to improve the drying efficiency.
  • the tub has an outlet opening, defined in an upper area of a first side wall, in which the first fan is operative.
  • Said fan takes in the damp air in a forced way to introduce it into a condensation conduit having a body that extends generally parallel to the aforesaid first side wall, with the dehumidified air that is then expelled into the external environment.
  • the outlet for the damp air is defined in the shell of the door of the machine, which forms the front wall of the wash tub, with the fan and the condensation conduit that are housed in the gap inside the door.
  • the system moreover includes a second fan, positioned in a housing space defined by a basement of the tub.
  • the casing of the second fan is mounted in such a way that the axis of rotation of the corresponding impeller, and hence the axis of the corresponding intake mouth, is substantially vertical; connected to the delivery of the casing is a conduit having a generally flattened configuration, which rises along a stationary side wall of the tub, as far as an inlet opening for the drying air.
  • Operative between the delivery of the casing of the second fan and the aforesaid conduit is an electric heater, designed to heat the air in order to improve the efficiency of the drying process.
  • the present invention basically aims to provide a dishwasher equipped with a system for drying dishes with open circuit for the air that is simple and inexpensive to produce and compact in structure, and at the same time is such as to guarantee a high efficiency of operation.
  • the above aim is achieved by a dishwashing machine having the characteristics specified in Claim 1. Preferred characteristics are indicated in the dependent claims 2-14.
  • the claims 1-14 form an integral part of the technical teaching provided herein in relation to the invention.
  • a dishwashing machine of the type indicated at the preamble of claim 1 is characterized in that:
  • the outlet for the damp air is defined in the upper wall of the tub facilitates evacuation of the steam, which tends in a natural way to rise upwards and to accumulate at the upper wall.
  • the relative position between the inlet opening for the drying air and the outlet opening for the damp air, in walls opposite to one another, enables the flow of drying air to impinge in an efficient and substantially uniform way upon the load of dishes present in the tub, supported on customary racks.
  • a dish in front of the inlet for the drying air there may be present a dish (a plate or a pan), with a consequent perturbation of the flow of the forced air at inlet, and said drawback is overcome in the case of the present invention.
  • a dish may be set also in front of the outlet opening for the damp air. This problem is, instead, overcome, according to the invention, by providing the outlet in the upper wall of the tub.
  • the part of the system that comprises the fan, the first conduit, and the heating means can be mounted entirely in the housing space of the basement of the machine, i.e., underneath the lower wall of the tub, with further advantage as regards compactness of the drying system as a whole.
  • the casing of the fan is mounted in the housing space of the basement with at least one of the axis of rotation of the impeller and the axis of the intake mouth oriented substantially horizontally, or in any case transverse with respect to a height dimension of the basement.
  • the air at inlet to the fan has already been at least slightly heated in so far as it can receive heat from other operating components of the machine present in the basement, to the advantage of the efficiency of the process (consider, for example, the motor of the washing pump and/or of the discharge pump, which, following upon their operation, heat up at least slightly, and can hence yield heat to the surrounding air; the body itself of the collection sump of the wash tub, mounted on the lower wall of the tub and projecting within the basement, can yield heat to the air).
  • the arrangement referred to above moreover enables a transverse intake flow to be obtained that affects to a large extent the housing space of the basement, thus affecting a number of functional components, which can yield heat to the air.
  • the casing of the fan can be oriented in such a way that the intake mouth faces the outside of the basement, and in particular the side corresponding to the side wall of the tub that the vertical portion of the condenser faces, inside which the condensation path for the air is defined.
  • the intake mouth is located in an area that is set underneath the lower end of the aforesaid vertical portion. This enables intake of the air that surrounds the condenser, favouring a heating of the condenser itself and hence increasing the condensation efficiency.
  • the vertical portion of the condenser can extend at at least a small distance from the corresponding side wall of the tub, in such a way that defined between the two parts is a gap, from which the air can be extracted in the aforesaid way, further improving the effect of condensation.
  • the presence of this gap contributes to improving the effect of condensation also when the intake mouth of the fan is oriented towards the inside of the basement, and not towards the outside.
  • the condenser has an outlet for the dehumidified air, which is located in the upper region of the vertical portion of the corresponding hollow body.
  • the inlet for the damp air in the vertical portion and the outlet for the dehumidified air are both set in the upper region of the same portion in which the condensation path is defined, in positions generally set alongside one another.
  • the condensation path includes a descending stretch, which goes substantially from the horizontal portion of the body of the condenser device to the lower region of the vertical portion, and an ascending stretch that goes substantially from the aforesaid lower region to the aforesaid upper region, in which the outlet for the dehumidified air is located.
  • the dehumidified air can be made to come out upwards, in a position relatively remote from the basement, at the same time guaranteeing a condensation path that is relatively extensive in length.
  • the body of the condenser device is substantially labyrinth-shaped.
  • the hollow body of the condenser device comprising its various portions, has a generally flattened configuration and is preferably made of a single piece of thermoplastic material, in particular obtained via blow-moulding.
  • the drying system can comprise a second fan, associated to the condenser device, for facilitating off-flow of the damp air from the tub and contributing to preventing undesirable increases in pressure inside the tub of the machine.
  • references to " an embodiment ,” or “ one embodiment “ in the framework of the present description is meant to indicate that a particular configuration, structure, or characteristic described in relation to the embodiment is comprised in at least one embodiment.
  • phrases such as “ in an embodiment “ or “ in one embodiment “ and the like, that may be present in various parts of the present description do not necessarily all refer to one and the same embodiment.
  • the particular configurations, structures, or characteristics may be combined in any adequate way in one or more embodiments.
  • the references used in what follows are only provided for convenience and do not define the sphere of protection or the scope of the embodiments.
  • the machine according to the invention comprises all the elements in themselves known for operation of a dishwashing machine, including an outer cabinet thereof, a user interface, a control system, pumps, level sensors, resistors, a sprayer system for spraying water on the dishes, etc.
  • FIG. 1 is a schematic representation of a dishwashing machine 1 having a system for drying the dishes, according to a first possible embodiment of the invention.
  • the machine 1 is illustrated limitedly to the parts of immediate interest for an understanding of the present invention.
  • the machine 1 has a dish-drying system with a substantially open circuit.
  • the machine 1 comprises a basement 2 and a wash tub 3, supported by the basement 2.
  • the basement 2 made for example of injection-moulded thermoplastic material, defines a housing space 2a, positioned within which are various functional components of the machine 1, amongst which, for example, a washing pump, a discharge pump, a pressure switch, a sump for collection of the washing liquid, etc., here not represented for reasons of greater clarity of the drawings.
  • the wash tub 3 is of a conception as a whole known, apart from the specific characteristics envisaged according to the above said first inventive concept, that are linked to the arrangement of the drying system.
  • the tub 3 hence comprises a lower wall 3a, an upper wall 3b, and four side walls; in Figures 1 and 2 only the stationary side walls of the tub 3 are visible, i.e., the rear wall 3c, and the right and left-hand walls, designated by 3d and 3e; the fourth side wall of the tub 3, i.e., its front wall, is constituted by an inner shell of the door of the machine, here not represented (the so-called "counter-door").
  • the left-hand wall 3e is provided with an opening 3e', at which, on the outside of the tub 3, a known multifunction device is mounted, through which the water coming from the water mains is introduced into the tub, according to modalities in themselves known; said device integrates the so-called "air-break" and can moreover fulfil venting functions to prevent, during operation of the machine, any overpressure within the tub 3 from arising.
  • the presence of the aforesaid device is not in any case strictly linked to operation of the drying system described hereinafter.
  • the drying system of the machine 1 basically includes an assembly for blowing and heating the drying air, designated as a whole by 10 in Figures 1-3 , and a condensation assembly, designated as a whole by 30 in Figures 1 and 3 .
  • the assembly 10 is substantially installed within the housing space 2a of the basement 2, whilst the condensation assembly 30 (see Figures 1 and 3 ) extends substantially on the outside of the tub 3.
  • the assembly 10 represented in isolation in Figures 4 and 5 , includes a body preferably formed in a number parts made of thermoplastic material assembled together.
  • a fan preferably of a centrifugal type, designated as a whole by 11.
  • the fan 11 has a respective volute or casing 12, housed in which is an impeller 13, driven by a corresponding electric motor 14.
  • the casing 12 has an intake mouth 12a, preferably substantially coaxial to the rotation axis of the impeller 13, and a delivery, not indicated.
  • the delivery of the casing 12 is obtained in a single piece with a descending portion 15a of a conduit, designated as a whole by 15, which connects the outlet of the fan 11 to an inlet for introducing drying air into the tub 3, described hereinafter.
  • the assembly 10 integrates, as has been said, also means for heating the drying air, which are preferably set along the conduit 15, upstream of the outlet end 16.
  • the heating means may be of any known type and comprise, for example, an electrical resistance or a radiator integrating a plurality of resistors of a PTC type or a serigraphed resistor.
  • the heating means designated by 17 only in Figure 5 , are not fully visible if not limitedly to the corresponding electrical contacts, here of a faston male type.
  • the heating means 17 are integrated in the assembly 10 preferably in a corresponding seat defined substantially in the aforesaid descending stretch 15a of the conduit 15, or at the inlet thereof, and hence slightly downstream of the outlet of the fan 11. From Figures 4 and 5 it may moreover be noted how the main body of the assembly 10 defines appendages 18 provided with corresponding pins 18a for anchorage of the assembly itself to the basement 2.
  • Figures 6-9 illustrate with different views an assembled condition of the assembly 10 (note that in Figures 6 and 7 the basement 2 and the side walls 3d, 3e of the tub are not represented, and that in Figure 9 also the representation of the lower wall 3a is omitted).
  • Figure 10 is a cross-sectional view of a portion of the lower wall 3a of the tub, with the corresponding inlet for the drying air, whereas Figure 11 shows a part of the assembly 10, from above.
  • the inlet for the drying air is defined at the lower wall 3a of the tub.
  • Said inlet includes a passage of the wall 3a, designated by 20, defined in the proximity of the right lower angle of the tub, and a tubular chimney 21, which extends through said passage, with interposition of fluid-tightness means and fixing means, having a structure in itself known and not indicated.
  • the chimney 21 has an upper end 21a and a lower end 21b, which open on opposite sides of the wall 3a, the upper end being at a height greater than the level reached by the water in the course of the washing or rinsing operations performed by the machine 1.
  • the lid 22 Associated to the upper end of the chimney 20 is a cap or lid 22 (see also Figures 2 and 9 ), which defines a substantially shielded or labyrinthine path, whereas coupled to the lower end is the outlet end 16 of the conduit 15.
  • the lid 22 has inner walls 22a shaped for defining the aforesaid labyrinthine path, according to modalities known to the person skilled in the art, and has one or more openings 22b for off-flow of the drying air; preferably, but not necessarily, the outlet opening or openings 22b are located in the rear part of the chimney 22, i.e., its part opposite with respect to the centre of the tub 3.
  • the conduit 15 has a particular substantially V-shaped development, which comprises the aforesaid descending portion 15a and ascending portion 15b, provided between which is an intermediate elbow portion, designated by 15c, which is preferably set at a height lower than that of the motor of the fan 11.
  • the conduit 15 extends substantially entirely in the housing space of the basement 2, underneath the lower wall 3a of the tub, with the portion 15a that is generally descending from the fan 11 to the elbow portion 15c, whilst the portion 15b is generally ascending from the elbow portion 15c to the inlet for the drying air, comprising the passage 20 and the chimney 21.
  • a drain opening defined in a position substantially corresponding to the elbow portion 15c of the conduit 15 is a drain opening, designated by 23, via which any water that may collect in the area of the elbow portion itself can be evacuated from the conduit 15.
  • the outlet 23 faces an underlying tray (not represented), which is normally present in the lower part of the basement 2.
  • a small tube which gives out into the aforesaid tray.
  • the amount of water that can reach the inside of the conduit 15, and hence the aforesaid tray is as a rule very modest so that said water can evaporate naturally from the tray in a brief period, without any prolonged accumulation in time.
  • sensors means of a type in itself known that, upon detection of a level of water deemed potentially dangerous, issue a warning for the user of the machine 1 and/or interrupt operation of the machine itself.
  • a baffle element 24 for example in the form of wall, preferably extends from an intermediate stretch of the ascending portion 15b of the conduit as far as a position corresponding to the lower part of the elbow portion 15c, a little upstream of the inlet of the drain opening 23.
  • Said baffle element 24 basically has the dual function of shielding the inlet of the opening 23, with respect to the flow of forced air that comes from the portion 15a of the conduit 15, and at the same time of defining a duct 24a that, like a funnel, conveys into the draining opening 23 any possible water that descends from the portion 15b towards the elbow portion 15c.
  • the conduit 15 is formed by the union of two longitudinally extending pieces, designated by 10a and 10b only in Figure 11 , with the baffle element 24 that itself includes two longitudinal halves, each made in a respective piece 10a, 10b.
  • the outlet for evacuating damp air from the tub 3 is defined in the upper wall 3b, in the region designated by 25 in Figure 12 , where a through hole is provided, not indicated.
  • a condenser device Connected in fluid communication to said outlet is a condenser device, designated as a whole by 31 for example in Figure 1 , forming part of the assembly 30, and defined hereinafter for reasons of simplicity as "condenser".
  • the condenser 31 illustrated as a whole in Figure 13 , basically consists of a hollow body provided with an inlet for the damp air 32, designed for connection with the aforesaid outlet of the tub, and a respective outlet for the dehumidified air 33, that in this case is in fluid communication with the environment external to the tub.
  • the body of the condenser 31 has a first vertical portion 34, which - in the installed condition - extends axially in the direction of the height of the tub 3, generally facing, and set parallel to, a side wall of the latter, in particular the stationary right-hand wall 3d, inside said vertical portion 34 there being defined a condensation path for the damp air leaving the tub 3.
  • the body of the condenser 31 then includes a second generally horizontal portion, designated by 35, which has dimensions and cross section of passage that are decidedly smaller than the portion 34 and extends substantially perpendicular to the latter.
  • the horizontal portion 35 of the body of the condenser 31 generally faces, and is set parallel to, the upper wall 3a of the tub 3 and is intended to connect the outlet for the damp air from the tub to the upper region of the portion 34.
  • the inlet 32 of the condenser 31 is defined in the horizontal portion 35, and in particular in its side facing the upper wall of the tub.
  • the inlet consists of a cylindrical stretch 32a, which is fitted, with interposition of known sealing means, in the aforesaid hole provided in the area 25 of the wall 3a (see Figure 12 ); fixing in position can be obtained, for example, by means of a shielding member 26, coupled - for instance, by snap action - to the end of the cylindrical stretch 32a that projects within the tub 3.
  • the outlet 33 for the dehumidified air of the condenser 31 is located in the upper region of the vertical portion 34, as may be clearly seen in Figure 14 , in a position generally set alongside the radiusing stretch 34a between the portion 34 itself and the horizontal portion 35, i.e., at the inlet for the damp air into the condensation path.
  • the condensation path hence includes a descending stretch, designated by 36 in Figure 13 , which extends substantially from the radiusing stretch 34a as far as the lower region of the vertical portion 34, and an ascending stretch 37, which extends substantially from said lower region up to the area in which the outlet 33 is present.
  • the body of the condenser 31 defines at least one intermediate longitudinal wall 38a, which extends substantially from the lower region of the portion 34 almost up to its upper end, in the proximity of the outlet 33.
  • the body of the condenser 31 is substantially labyrinthine; for said purpose, transverse walls 38b are provided, with a substantially interdigitated arrangement, some of which depart from the longitudinal wall 38a.
  • the walls 38a and 38b are made of a single piece in the body of the condenser, substantially in the form of grooves projecting towards the inside of the body itself (as is clearly visible in particular in Figures 14 and 15 ).
  • a hollow body of the above sort, of a generally flattened configuration and made of a single piece, can, for example, be advantageously obtained by means of blow-moulding of thermoplastic material.
  • a receptacle for collection of the water resulting from condensation of the damp air.
  • the aforesaid receptacle, formed by a corresponding lower portion of the body of the condenser 31, is designated by 39 in the figures and has a respective drain union or outlet, designated by 40 in Figure 15 .
  • a small tube designated by 41 in Figures 6 , 7 and 9 , which gives out into the collection tray previously mentioned in relation to the drain outlet 23 of the conduit 15.
  • the amount of water discharged by the condenser 31 is as a rule modest and can evaporate naturally from the tray in a short period.
  • the machine 1 is of course provided with a control system of its own with corresponding user interface, of a substantially known conception, which enables selection, start-up, and control of a plurality of washing programs.
  • At least one of said programs is configured for carrying out a step of drying of the dishes. Consequently, after the step of discharge of the water used in the course of the last step of the program that envisages the use of water (typically the last rinsing step), the control system issues a command for start of the fan 11 and supply of the heating means 17. The air taken in via the mouth 12a of the fan 11 is then forced into the conduit 15, at the inlet of which it is heated.
  • the control system includes sensor means for detecting the temperature of the air (for example, set downstream of the heating means 17) and/or for detecting the rate of humidity of the air (for example, within the condenser 31), for control of the process, according to modalities in themselves known.
  • a device for heating the air based upon the use of PTC resistors, means for sensing the temperature of the air are not strictly necessary, thanks to the characteristics of self-regulation in temperature proper to this type of resistors.
  • the temperature of the drying air is detected in an indirect way by the control system, exploiting the temperature sensor used for detecting the temperature of the washing or rinsing water.
  • the aforesaid sensor - not illustrated in the figures - can be installed in the proximity of the chimney 21, for example facing the outlet 22b of its lid 22.
  • the hot air passes into the chimney 21 and, through the lid 22, propagates into the tub 3 from beneath, impinging upon the dishes contained in the racks inside the tub (not represented). Pre-heating of the air obviously favours and speeds up the process of drying of the dishes.
  • the hot air tends to rise from beneath upwards, thus favouring also off-flow of the damp air towards the upper outlet, said damp air tending in any case already in itself to move in a natural way into the upper part of the tub 3.
  • the damp air then penetrates into the horizontal portion 35 of the condenser 31, and then reaches the vertical portion 34.
  • the air then traverses the descending stretch 36 of the condensation path, yielding humidity and then rises along the ascending stretch 37 and comes out substantially dehumidified into the external environment, via the opening 33.
  • the condensation water is collected in the receptacle 39, from which it is evacuated via the tube 41.
  • the drying process can terminate after a pre-set program time, or else can take place following upon detections made by the aforesaid sensor means, according to a technique in itself known (for example, detecting a rate of humidity of the air not higher than a pre-set threshold).
  • the machine 1 according to the invention can be of the stand-alone type, in which case it will be provided with a cabinet that encloses the tub, with the condenser assembly 30 that can easily be housed even in the tiny gap normally existing between the external cabinet and the side and upper walls of the tub of a dishwasher.
  • the machine 1 may also be of the built-in type, and hence without a cabinet that encloses the tub completely.
  • the casing 12 of the fan 11 in such a way that the intake mouth 12a faces the outside of the basement 2, and hence is in a position generally underlying the condenser assembly 30 (see by way of reference, for example, Figures 1 and 3 ).
  • the fan 11 takes in air that is present in the proximity of the condenser 31 so as to tend to reduce the temperature thereof and hence favour the condensation process.
  • the solution of providing at least the vertical portion 34 of the condenser 31 set at a distance from the corresponding stationary wall of the tub is in any case advantageous also in the case exemplified in the figures, with the intake mouth 12a of the fan 11 facing the inside of the basement 2, in order to contain any possible transmission of heat between said wall and the body of the condenser.
  • the drying system of the machine according to the invention can comprise also a further aspirator, operatively associated to the condenser device 31 for facilitating off-flow of the damp air from the tub 3 and contributing to balancing the pressure in the tub.

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  • Detail Structures Of Washing Machines And Dryers (AREA)

Claims (14)

  1. Lave-vaisselle présentant un système de séchage, le lave-vaisselle (1) comprenant un socle (2) et une cuve de lavage (3) supportée par le socle (2), dans lequel le socle (2) définit un espace de logement (2a) permettant de loger des composants fonctionnels du lave-vaisselle, dans lequel la cuve (3) présentant une paroi inférieure (3a), une paroi supérieure (3b) et des parois latérales (3c-3e), et dans lequel le système de séchage comprend .
    - un orifice d'entrée (20-22) destiné à introduire de l'air de séchage dans la cuve (3) ;
    - un orifice de sortie (25) destiné à évacuer l'air humide à partir de la cuve (3) ;
    - un dispositif de condenseur (31), présentant un corps creux pourvu d'un orifice d'entrée respectif (32) en communication de fluide avec l'orifice de sortie destiné à l'air humide (25), et un orifice de sortie respectif (33), en communication de fluide avec l'environnement extérieur à la cuve (3), le dispositif de condenseur (31) ayant une première partie (34) qui fait globalement face à une paroi latérale (3d) de la cuve (3) et qui définit une trajectoire de condensation (36-37) destiné à l'air humide quittant la cuve (3) ;
    - un ventilateur (11) présentant un carter de ventilateur (12) dans lequel est logée une turbine (13) entraînée par un moteur correspondant (14), le carter de ventilateur (12) étant monté dans l'espace de logement (2a) du socle (2) et présentant une ouverture de prise d'air (12a) et une branche de distribution ; et
    - des moyens pour chauffer l'air de séchage (17) agencés fonctionnellement le long d'un premier conduit (15) qui raccorde la branche de distribution du carter de ventilateur (12) à l'orifice d'entrée destiné à l'air de séchage (20-22),
    caractérisé en ce que :
    - l'orifice d'entrée destiné à l'air de séchage (20-22) présente une cheminée (21) qui s'étend à travers la paroi inférieure (3a) de la cuve (3) et présente une extrémité supérieure (21a) et une extrémité inférieure (21b), lesquelles s'ouvrent sur les côtés opposés de ladite paroi inférieure (3a), au niveau de l'extrémité supérieure (21a) se trouvant couplée à un couvercle de cheminée (22) définissant un parcours essentiellement tracé en labyrinthe et, au niveau de l'extrémité inférieure (21b), se trouvant couplée à une extrémité de sortie (16) du premier conduit (15) ;
    - l'orifice de sortie destiné à l'air humide (25) est défini dans la paroi supérieure (3b) de la cuve (3) ;
    - le dispositif de condenseur (31) comprend une seconde partie (35), laquelle fait globalement face à la paroi supérieure (3b) de la cuve (3) et s'étend entre l'orifice de sortie destiné à l'air humide (25) et une zone supérieure de la première partie (34) du dispositif de condenseur (31).
  2. Lave-vaisselle selon la revendication 1, dans lequel ladite paroi latérale (3d) est une paroi fixe de la cuve (3) .
  3. Lave-vaisselle selon la revendication 1 ou la revendication 2, dans lequel le premier conduit (15) est globalement configuré en forme de V, c'est-à-dire qu'il comprend une extension globalement descendante (15a) allant de la branche de distribution du carter de ventilateur (12) vers une extension en coude (15c) du premier conduit (15) et une extension globalement ascendante (15b) allant de ladite extension en coude (15c) vers l'orifice d'entrée destiné à l'air de séchage (20-22).
  4. Lave-vaisselle selon l'une quelconque des revendications précédentes, dans lequel le carter de ventilateur (12) est monté dans l'espace de logement (2a) du socle (2), au moins un axe de rotation de la turbine (13) et un axe de l'ouverture de la prise d'air (12a) étant orientés dans une direction qui est globalement horizontale ou dans un cas quelconque transversale par rapport à la hauteur du socle (2).
  5. Lave-vaisselle selon la revendication 3, dans lequel le premier conduit (15) s'étend essentiellement totalement dans l'espace de logement (2a) du socle (2).
  6. Lave-vaisselle selon la revendication 3 ou la revendication 5, dans lequel les moyens de chauffage de l'air (17) sont positionnés dans une embase correspondante définie essentiellement dans ladite extension descendante (15a) du premier conduit (15).
  7. Lave-vaisselle selon l'une quelconque des revendications 4 à 6, dans lequel se trouve une ouverture de drainage (23) définie essentiellement au niveau de l'extension en coude (15c) du premier conduit (15).
  8. Lave-vaisselle selon la revendication 7 dans lequel, à l'intérieur du premier conduit (15) se trouve un élément déflecteur (24) qui est prévu configuré de façon à empêcher un reflux important vers l'ouverture de drainage (23) de l'air forcé par le ventilateur (11) et pour acheminer en même temps dans l'ouverture de drainage (23) toute l'eau qui aurait pu possiblement atteindre l'intérieur du premier conduit (15) à travers l'orifice d'entrée destiné à l'air de séchage (20-22).
  9. Lave-vaisselle selon l'une quelconque des revendications précédentes, dans lequel le dispositif de condenseur (31) présente un orifice de sortie destiné à de l'air déshumidifié (33) qui est situé dans ladite zone supérieure de la première partie correspondante (34), la trajectoire de condensation comportant une extension descendante (36), laquelle s'étend essentiellement depuis la seconde partie (35) jusqu'à une zone inférieure de ladite première partie (34), et une extension ascendante (37), laquelle s'étend essentiellement depuis ladite zone inférieure jusqu'à une surface de ladite zone supérieure où l'orifice de sortie (33) destiné à de l'air déshumidifié est situé.
  10. Lave-vaisselle selon la revendication 9, dans lequel au niveau de l'extrémité inférieure de la première partie (34) du dispositif de condenseur (31), dans une position correspondant essentiellement à l'extrémité de l'extension descendante (36) de la trajectoire de condensation, se trouve défini un réceptacle (39) destiné à collecter l'eau de condensation, présentant un orifice de sortie de drainage respectif (40).
  11. Lave-vaisselle selon la revendication 9 ou la revendication 10, dans lequel au niveau de ladite extension descendante (36) de la trajectoire de condensation, le corps du dispositif de condenseur (31) est configuré essentiellement sous la forme d'un labyrinthe.
  12. Lave-vaisselle selon l'une quelconque des revendications précédentes, dans lequel le corps creux du dispositif de condenseur (31) présente une configuration globalement aplatie et est constitué en une seule pièce de matériau thermoplastique, en particulier une pièce moulée par soufflage.
  13. Lave-vaisselle selon l'une quelconque des revendications précédentes, dans lequel la première partie (34) du dispositif de condenseur (31) est, au moins en partie, placée à distance de ladite paroi latérale (3d) de la cuve (3).
  14. Lave-vaisselle selon l'une quelconque des revendications précédentes comportant, également, un ventilateur supplémentaire couplé fonctionnellement au dispositif de condenseur (31) et conçu pour faciliter l'écoulement résultant de l'air humide à partir de la cuve (3).
EP12780840.0A 2011-09-20 2012-09-18 Lave-vaisselle comprenant un système de séchage Active EP2757930B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15192917.1A EP3000377B1 (fr) 2011-09-20 2012-09-18 Machine à laver la vaisselle avec système de séchage
PL12780840T PL2757930T3 (pl) 2011-09-20 2012-09-18 Zmywarka do naczyń z układem suszenia

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000838A ITTO20110838A1 (it) 2011-09-20 2011-09-20 Macchina lavastoviglie con sistema di asciugatura
IT000841A ITTO20110841A1 (it) 2011-09-20 2011-09-20 Macchina lavastoviglie con sistema di asciugatura
PCT/IB2012/054932 WO2013042036A1 (fr) 2011-09-20 2012-09-18 Lave-vaisselle comprenant un système de séchage

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EP2757930A1 EP2757930A1 (fr) 2014-07-30
EP2757930B1 true EP2757930B1 (fr) 2015-11-25

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EP12780840.0A Active EP2757930B1 (fr) 2011-09-20 2012-09-18 Lave-vaisselle comprenant un système de séchage

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PL (1) PL2757930T3 (fr)
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EP3000377B1 (fr) 2017-08-02
EP3000377A1 (fr) 2016-03-30
EP2757930A1 (fr) 2014-07-30
WO2013042036A1 (fr) 2013-03-28

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