EP2199453A1

EP2199453A1 - A household appliance

Info

Publication number: EP2199453A1
Application number: EP08171991A
Authority: EP
Inventors: Luciano Sartor; Daniele Da Riol; Fabio Pasut; Michele Bisaro
Original assignee: Electrolux Home Products Corp NV
Current assignee: Electrolux Home Products Corp NV
Priority date: 2008-12-17
Filing date: 2008-12-17
Publication date: 2010-06-23
Anticipated expiration: 2028-12-17
Also published as: ATE517206T1; WO2010069535A1; PL2199453T3; EP2199453B1

Abstract

A household appliance (100) comprises a cabinet (105) provided with a worktop (110) defining a surface (130) having a plurality of apertures (135) in fluid communication with an air conveying system (245) adapted to deliver a flow of air through said apertures. A liquid drainage arrangement (255,260,405,410,705,710) is provided, adapted to drain liquid deposits from said worktop.

Description

The present invention relates in general to the field of household appliances, and more particularly to laundry washing and/or drying appliances like laundry washers, dryers and washer-dryers.
Garments made of delicate textile materials, such as cashmere, are not adapted to undergo regular drying treatments in a tumble dryer, owing to the mechanical stresses, mainly in the form of impacts, which the textile fibres would be subject to. More gentle drying treatments are thus recommendable for these delicate textiles, such as line drying or flat drying, which on the other hand are rather time-consuming processes.
The solutions disclosed in the European patent applications EP 1845185 and EP 1854916 , both in the name of the present Applicant, are effective in eliminating the above cited drawbacks, by providing a household appliance that comprises a cabinet with a worktop defining a drying surface featuring a plurality of apertures, each one of which is fluidly connected with conveying means adapted to deliver a flow of air towards and through said apertures, for gently but rapidly drying garments that are laid upon the worktop drying surface.
The Applicant has observed that in the solutions disclosed in EP 1845185 and EP 1854916 some problems may arise in case, due for example to a misconduct of the user, very wet garments are laid on the drying surface: the water dripping from the garments, passing through the apertures in the worktop drying surface, falls on the bottom of the worktop, and there it remains and accumulates, forming a water deposit, a thing that is undesirable under many respects. A similar problem is encountered when water is accidentally poured onto the worktop drying surface.
The present invention proposes an improvement to the solutions set forth in the two cited European patent applications, suitable to overcome the abovementioned problems.
According to an aspect of the present invention, a household appliance is provided, comprising a cabinet provided with a worktop defining a surface having a plurality of apertures in fluid communication with an air conveying system adapted to deliver a flow of air through said apertures. A liquid drainage arrangement is provided in the household appliance, adapted to drain possible liquid deposits from said worktop.
In particular, said liquid drainage arrangement may comprise a liquid drainage hole provided in the worktop. The worktop may comprise a base shaped so as to cause liquid deposits to converge towards the liquid drainage hole.
In embodiments of the present invention, the liquid drainage hole may be fluidly connected to a washing liquid discharge pump of the household appliance provided for discharging washing liquid from a tub of the household appliance, for example the tub of a washing machine or of a washer/dryer.
A liquid drainage conduit may be connected at one end thereof to the liquid drainage hole, and, at an another end, the liquid drainage conduit may terminate at a user-accessible location, of said cabinet, for example a location where a washing liquid filter is usually located.
In other embodiments of the present invention, the liquid drainage hole may be fluidly connected to a condense liquid collection arrangement provided in the household appliance, for example a condenser or heat-pump dryer or washer/dryer, for collecting condense liquid from the condenser of a laundry drying circuit.
In particular, the liquid collection arrangement may comprise a condense liquid collection tank fluidly connected to a condense liquid collection tray below the condenser. The liquid drainage hole may be fluidly connected to the liquid collection tank, and/or it may be located above an opening in the liquid collection tank so that liquid deposits may fall through the liquid drainage and said opening hole into the liquid collection tank, and/or where the liquid collection tank is accommodated within a tank container fluidly connected to the liquid collection tray, in such a way that liquid overflowing from the liquid connection tank is discharged into the liquid collection tray, the liquid drainage hole may be fluidly connected to the tank container. Also, the liquid drainage hole may be fluidly connected directly to the condense liquid collection tray.
The household appliance may comprise a steam generation arrangement including a steam generator and a steam generator water tank, and the liquid drainage hole may be fluidly connected to the steam generator water tank.
Preferably, the surface with apertures is in metal. More preferably, the surface with apertures has upward protrusions between said apertures so as to keep garments laid on said surface distanced from said apertures.
These and other features and advantages of the present invention will become apparent by reading the following detailed description of some embodiments thereof. For better intelligibility, the description should be read in conjunction with the attached drawings, wherein:

Figure 1 is a perspective view of a household appliance with a worktop defining a drying surface and wherein a solution according to an embodiment of the present invention can be advantageously implemented;
Figure 2 is an exploded view of the worktop of the household appliance of Figure 1 according to an embodiment of the present invention;
Figure 3A is a partial, side cross-sectional view of the household appliance with the worktop of Figure 2 ;
Figure 3B shows, schematically and in enlarged scale, a detail of a worktop drying surface according to an embodiment of the present invention;
Figure 4 schematically shows a worktop water deposit drainage arrangement according to an embodiment of the present invention;
Figure 5 schematically shows a worktop water deposit drainage arrangement according to another embodiment of the present invention; and
Figures 6 and 7 schematically shows a worktop water deposit drainage arrangement according to still another embodiment of the present invention.

In Figure 1 there is shown a household appliance 100, in particular a household appliance for washing (e.g., a domestic washing machine) and/or drying clothes (e.g. a domestic dryer or washer/dryer), wherein a solution according to an embodiment of the present invention is advantageously implemented.
As described in the two cited European patent applications EP 1845185 and EP 1854916 , which are incorporated herein by reference, the household appliance 100 comprises an outer casing or cabinet 105 with a worktop 110 and a front panel carrying operational input and setting controls, a drum (not visible in Figure 1 ) rotatably supported inside the cabinet 105 and adapted to be loaded with the items to be washed and/or dried, an opening in a front wall 115 of the cabinet 105 for loading and unloading the items into and from the drum, and a door 125 hinged to the front wall 115 for closing said opening.
The worktop 110 of the household appliance 100 comprises a drying surface 130 having a plurality of apertures 135, each one of which is fluidly connected to conveying means adapted to direct a flow of air through said apertures 135, for drying garments that are placed on the drying surface 130. Garments to be dried can be placed on the drying surface 130, and, by activating the conveying means, air is caused to flow through the apertures or perforations 135 so as to hit the garments placed thereon, thereby gently drying it.
In the exemplary embodiment shown in Figure 1 , the drying surface 130 comprises two surfaces, one being the surface of the worktop 110 itself, and the other being the surface of a drawer-like element 140 which is slidable in an accommodation or housing defined within an external worktop structure 143; the drawer-like element 140 can slide between a first position, in which the drawer-like element 140, and thus its drying surface, is contained, i.e. fully inserted within the external worktop structure 143 (just a handgrip portion 145 provided on the front of the drawer-like element 140 protruding from the worktop 110 for enabling the extraction of the drawer-like element 140), and a second position (the one depicted in Figure 1 ) in which the drawer-like element 140, and thus its drying surface, is extracted and extended horizontally out of the external worktop structure. This arrangement provides a quite large drying surface for lying even relative large garments in stretched condition; in alternative embodiments of the invention, the drying surface may consist of the surface of the drawer-like element 140 only, the surface of the worktop 110 not being provided with apertures, or the drawer-like element 140 may be absent, the drying surface being in such a case formed by the top surface of the worktop 110. However, providing the drawer-like element 140 enables garments to be dried even when the surface of the worktop 110 is not directly accessible, due to obstacles immediately above the worktop.
Both the worktop 110 and the drawer-like element 140 are internally hollow so as to integrally form an air passage for conveying the flow of drying air under and along the drying surface 130. The air passage defines a drying-medium conveying channel fluidly connected with air circulating means. The air circulating means may for instance comprise at least one blower arranged inside the appliance cabinet and adapted to take in air from either the interior or the exterior of the cabinet 105 to convey it into the drying-medium conveying channel. The blower may be housed within a proper accommodation provided to this purpose inside the cabinet of the appliance, or inside the worktop external structure 143, in order to take in the ambient air from the interior of the cabinet (which is normally not air-tight and thus is in fluid communication with the external ambient, from which air can enter into the cabinet). Other arrangements are however possible, as described in EP 1845185 , which is incorporated herein by reference; in particular, and merely by way of example, the air circulating means may be located outside the cabinet 105, for example being associated to the upper backward portion of the cabinet 105 in proximity to and below the worktop 110 projecting from the casing, or be arranged above the worktop 110. The air to be conveyed to the drying surface may be ambient air taken in from the exterior or interior of the cabinet, or, in case the household appliance is a dryer or a washer dryer, particularly of the type having a condenser to remove moisture from the process air used to dry the items in the drum, the air to be conveyed to the drying surface can be process air used to dry the items inside the dryer drum, or air used to cool the condenser.
Figure 2 shows in detail and in exploded view the structure of the worktop 110, in an embodiment of the present invention. The worktop 110 is also shown in cross-section in Figure 3A .
The worktop 110 comprises an outer frame 205, for example in plastic material, shaped and sized so as to be adapted to be mounted on top of the cabinet 105. The outer frame 205 has an inner perimetral edge 207 defining an abutment support surface for a perforated metal plate 210 that forms the top surface of the worktop 110. The outer frame 205 is mounted to a lower base 213, having, on the rear part thereof, a concave or downwardly inclined portion 255 or in general a shape adapted to cause water deposits to converge towards a water drainage hole 260; the remaining part 257 of the lower base 213 is preferably slightly inclined towards the concave portion 255. The drawer-like element 140 is comprised of another perforated metal plate 215 with downwardly bent edges 220, through which the metal plate 215 is mounted to a drawer base 225 in a spaced-apart way so as to define an air passage for the drying air. The drawer base 225, at opposite sides thereof, is shaped so as to define two elongated seats 230 adapted to accommodate respective sliders 233 which are slidable within and along sliding guides 235 mounted to the base 213. Preferably, also the drawer base 225 is shaped (for example, inclined) such that any water deposit converges and fall onto the lower based 213. A front member 240 is mounted frontally to the perforated metal plate 215 and defines a handgrip for facilitating the extraction of the drawer-like element 140 from the worktop 110.
A blower 245 and a resistance heater 250 are accommodated between the outer frame 205 and the lower base 213 in the back thereof. In the back of the outer frame 205, in correspondence of the blower 245, an aperture 253 is provided for the intake of air to be conveyed through the apertures in the drying surface.
The drying surface 130 is thus comprised of the perforated metal plate 210 and the perforated metal plate 215. Thanks to the fact that the perforated plates 210 and 215 are in metal, which is a heat conductor, the heat generated by the resistance heater 250 heats the drying surface, promoting the drying of the garments laid thereon.
The inclination of the lower base 213 and its concave portion 255 facilitate convergence towards the drainage hole 260 of water deposits possibly caused by dripping of water through the apertures 135 in the drying surface 130, due for example to the fact that excessively wet garments are laid on the drying surface 130. As will be described in the following, the drainage hole is fluidly connected to a drainage conduit for draining the water deposits.
Figure 3 schematically depicts a portion of one or both of the perforated metal plates 210 and 215, in a preferred invention embodiment. In regions between the apertures 135, the metal plates 210 and 215 are shaped so as to define bumps 305 projecting upwardly, so that when garments are laid on the drying surface 130, they remain distanced from the apertures 135, and thus facilitate the flow of drying air out of the apertures 135 themselves.
Figures 4 and 5 schematically show exemplary arrangements for draining water deposits from the worktop 110, suitable to be implemented in a washer or washer dryer.
In particular, Figure 4 shows an arrangement according to an embodiment of the present invention in which a drainage conduit 405 (part of which is also visible in Figure 3A , being denoted 305) is provided within the cabinet 105 fluidly connecting the drainage hole 260 provided in the lower base of the worktop 110 to a water discharge pump 410 of the washer or washer/dryer, typically provided for discharging the washing liquid from the tub that rotatably accommodates the drum to a water drainage (through a discharge hose 415). In this way, when the pump 410 is activated to discharge the washing liquid from the drum, also the water deposit in the worktop 110 is discharged.
Figure 5 shows another arrangement according to an embodiment of the present invention, in which the drainage conduit 505 leads from the drainage hole 260 to an externally accessible location in the cabinet 105, for example in the region where a washing liquid filter is accommodated; this region is typically accessible to the user, for instance by opening a portlet 510, for regular inspection and cleaning of the filter 505. The drainage conduit 405 may for example end in correspondence of this region, and be closed at its free end by a cap, which the user can open to discharge the water deposit possibly present in the worktop.
In the following, other solutions according to different embodiments of the invention will be described adapted to drain water deposits from the household worktop 110.
Referring to Figures 6 and 7 , a solution according to an embodiment of the present invention for draining water deposits from the worktop 110 which is particularly adapted to a dryer is shown. As known in the art, a condenser-type dryer typically comprises a closed-loop drying air circuit, adapted to cause heated drying air to circulate through the dryer drum 605, an air-cooled condenser 610, i.e. an air/air heat exchanger, adapted to remove moisture from the hot moisture-laden drying air exiting the drum 605, and an open-loop cooling air circuit adapted to circulate through the air-cooled condenser a stream of cooling air taken in from the outside ambient to cool said condenser, and to let out said stream of cooling air again into the outside ambient.
Through the closed-loop drying air circuit, the hot and moisture-laden drying air is caused to leave the drum 605 and is conveyed towards the air-cooled condenser 610; then, the dehydrated drying air exiting the condenser is sent back into the drum, upon having been duly heated up again, so as to remove additional moisture from the clothes being tumbled in the drum. Heating means are provided downstream from the air-cooled condenser to heat up the dehydrated drying air due to be sent again into the drum.
The air-cooled condenser comprises a plurality of fluid passageways, along which the clothes drying air is able to flow for having the moisture condensed and removed therefrom, and these fluid passageways are exposed to the flow of cooling air flowing in the open-loop cooling air circuit. When the cooling air passes through the condenser, the drying air temperature is lowered and heated is transferred to the cooling air; thus, the cooling air which is released into the ambient is warm.
The condenser 610 is typically arranged at the base of the appliance, under the drum 605. In order to collect condense water dripping from the condenser, a water condense collecting tray 615 is placed below the condenser 610. The condense water collected in the tray is conveyed, through a pump 620 and a pipe 625, to a main tank 630, which is removably accommodated in the machine cabinet, for example in an upper region thereof, so as to be easily extracted by a user for emptying. The main tank 630 is preferably slidably accommodated within a tank container or hopper 631 shaped in such a way as to collect water possibly overflowing from the tank 630 through an overflow opening 632, and connected through a pipe 633 to the water condense collecting tray 615.
The dryer may also be equipped with a steam generator 635, for example an electric boiler, supplied through a pipe 637 with water stored in a secondary tank 640; in operation, the steam generator 635 generates steam by evaporating the water taken from the secondary tank 640, located for example aside the main tank 630, and the generated steam is conveyed, through a steam delivery conduit 645, into the inner region of the drum 605 for treating the laundry being dried. The secondary tank 640 may also be in fluid communication with the main tank 630, so that the condense water may be exploited for generating steam.
According to an embodiment of the present invention, shown in Figure 7 , the main tank 630 into which the condense water is pumped is provided with an upper opening 705 which, when the main tank 630 is inserted into the cabinet, is located below the drainage hole 260 provided in the worktop 110; the opening 705 m ay for example be the overflow opening 632. Preferably, a short conduit 710 is attached to the worktop below the drainage hole 160 to convey the water deposit from the worktop to the main tank 630.
In alternative embodiments of the present invention, the water deposit in the worktop 110 may be discharged into the main tank container or hopper 631, and from there conveyed to the water condense collecting tray 615.
In still alternative embodiments of the present invention, the drainage hole 260 in the worktop may be fluidly connected directly to the water condense collecting tray 615, by means of a pipe, or to the secondary tank 640.
The present invention has been here described by presenting some exemplary embodiments thereof. Several changes to the described embodiments, as well as different embodiments of the present invention are possible, without departing from the scope of the appended claims.
For example, the embodiments described in connection with Figures 6 and 7 may be implemented as well in a heat-pump dryer, instead of an air condenser dryer.
A solution similar to that of Figures 6 and 7 may be implemented in a dryer of the type described in the co-pending European patent application No. 08157219 , in the name of the present Applicant, which is incorporated herein by reference, wherein the main tank 630 takes the form of a reservoir being fitted removably to, and projecting from, an inner wall of the door 125 of the appliance. The drainage hole 260 may be fluidly connected, by means of a pipe, to an inlet opening of the reservoir, so that any water deposit in the worktop is discharged into the reservoir.

Claims

A household appliance (100) comprising a cabinet (105) provided with a worktop (110) defining a surface (130) having a plurality of apertures (135) in fluid communication with an air conveying system (245) adapted to deliver a flow of air through said apertures,
characterized by comprising
a liquid drainage arrangement (255,260,405,410,705,710) adapted to drain liquid deposits from said worktop.
The household appliance of claim 1, wherein said liquid drainage arrangement comprises a liquid drainage hole (260) provided in the worktop.
The household appliance of claim 2, wherein said worktop comprises a base (213) shaped so as to cause liquid deposits to converge towards the liquid drainage hole.
The household appliance of claim 2 or 3, wherein said liquid drainage hole is fluidly connected to a washing liquid discharge pump (410) of the household appliance provided for discharging washing liquid from a tub of the household appliance.
The household appliance of claim 2 or 3, wherein a liquid drainage conduit (505) is connected at one end thereof to the liquid drainage hole, and, at an another end, the liquid drainage conduit terminates at a user-accessible location (510) of said cabinet.
The household appliance of claim 2 or 3, wherein said liquid drainage hole is fluidly connected to a condense liquid collection arrangement (615,630) provided in the household appliance for collecting condense liquid from a condenser (610) of a laundry drying circuit.
The household appliance of claim 6, wherein said liquid collection arrangement comprises a condense liquid collection tank (630) fluidly connected to a condense liquid collection tray (615) below the condenser.
The household appliance of claim 7, wherein the liquid drainage hole is fluidly connected to the liquid collection tank.
The household appliance of claim 8, wherein said liquid drainage hole is located above an opening in the liquid collection tank so that liquid deposits may fall through the liquid drainage and said opening hole into the liquid collection tank.
The household appliance of claim 7, wherein the liquid collection tank is accommodated within a tank container (631) fluidly connected to the liquid collection tray, in such a way that liquid overflowing from the liquid connection tank is discharged into the liquid collection tray, and wherein the liquid drainage hole is fluidly connected to the tank container.
The household appliance of claim 7, wherein the liquid drainage hole is fluidly connected to the condense liquid collection tray.
The household appliance of claim 2, comprising a steam generation arrangement (635,640) including a steam generator (635) and a steam generator water tank (640), and wherein the liquid drainage hole is fluidly connected to the steam generator water tank.
The household appliance of any one of the preceding claims, wherein said surface is in metal.
The household appliance according to any one of the preceding claims, wherein said surface has upward protrusions (305) between said apertures so as to keep garments laid on said surface distanced from said apertures.