US20100126235A1

US20100126235A1 - Household appliance having a collecting apparatus for leakage water

Info

Publication number: US20100126235A1
Application number: US12/444,944
Authority: US
Inventors: Edwin Bolduan; Alexander Schlitzer
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2006-10-10
Filing date: 2007-10-04
Publication date: 2010-05-27
Also published as: CN201162130Y; CN101522978B; DE502007002888D1; DE102006047952A1; ATE458082T1; WO2008043706A1; CN101522978A; EP2092107B1; EA200970331A1; EP2092107A1; EA014416B1

Abstract

The invention relates to a home appliance 1 for care of laundry items, with a collection facility 5 for leakage water arranged on the floor 4 of the home appliance 1 and a float 81 arranged in the collection facility 5, which, depending on the water level W in the collection facility 5, is embodied for electrical contacting of a switch 8, with the float 81 being arranged in a first subarea 5 a of the collection facility 5 which is separated by a water-retaining wall 52 from a second partial area 5 b of the collection facility 5.

Description

The invention relates to a home appliance for care of laundry items, especially a washing machine or a washer-dryer, with a collection facility for leakage water on the floor of the home appliance and a float arranged in the collection facility which is embodied for electrical contacting of a switch depending on the water level in the collection facility.
A home appliance with a corresponding overflow device and a so-called aquastop switch, with which a stop valve in the cold water feed pipe is able to be put into its closed position if a specific volume of leakage water has collected in the collection vessel and float rises in order to trigger this aquastop switch, is known from DE 199 36 420 B4.
A problem which can arise with a known generic home appliance is that with relatively low amounts of leakage water, said water can accumulate below the float and can cause the float to stick or to become calcified. The functionality, especially the aquastop function of the float, can be adversely affected by this.
The object of the present invention is thus to create a home appliance for care of laundry items from which such impaired functioning is excluded.
The object is achieved by a home appliance which has the features claimed in claim 1.
An inventive home appliance is embodied for the care of laundry items and comprises a collection facility for leakage water which is arranged on the floor of the home appliance. In addition the home appliance comprises at least one float which is arranged in the collection facility for leakage water. This float is embodied so that it is embodied for electrically contacting a switch of the home appliance depending on the water level in the collection facility. In particular this switch is switched via a switch circuit so that a stop valve of a cold water feed pipe is able to be moved into its closed position for the home appliance. The float is arranged in a first subarea or of the collection facility with said first subarea being separated from a second subarea of the collection facility by a water-retaining wall.
This embodiment allows the collection facility to be subdivided into at least two subareas and the functionality of the float to be improved since sticking or calcification of the float as a result of a relatively small amount of leakage water collecting beneath the float can be prevented in this way.
Preferably the water-retaining wall is integrated into the collection facility. The integral embodiment makes simple manufacturing possible, which also allows costs to be reduced. Above and beyond this the integral embodiment of this water-retaining wall in the collection facility also enables a mechanically-stable arrangement to be created.
Preferably the home appliance includes a device for catching water running over the top of the device down onto it and for diverting the water into the collection facility. The precise collection and introduction of the water into the collection facility can be guaranteed by this device. Preferably at least parts of this device are embodied from plastic. This enables a relatively light element to be produced which in addition can also be manufactured at low cost. For example the device can be embodied as an injection-molded part. The plastic embodiment also enables a wear-resistant component to be provided since water cannot attack the plastic material.
Preferably the device is embodied or arranged so that the water caught can be introduced into the second subarea, especially exclusively into the second subarea of the collection facility. This embodiment makes it possible to ensure that only a relatively small amount of leakage water occurring does not reach the first subarea and thus sticking or calcification of the float is reliably prevented. Only when a larger volume of leakage water has collected in the second subarea and is retained by the water-retaining wall can an overflow into the first subarea then occur. Preferably the water-retaining wall is embodied so that water collected in the second subarea flows away or over this water-retaining wall and reaches the first subarea of the collection facility. This means that only relatively large amounts of leakage water are directed into the first subarea which no longer cause sticking or calcification of the float.
In addition this also enables it to be guaranteed that a premature triggering for small amounts of leakage water no longer occurs.
The water-retaining wall is preferably curved or at least embodied in the shape of a curve in some areas.
It has proved especially advantageous for water-retaining wall to have a height of between 3 mm and 10 mm, especially around 5 mm. The retaining wall preferably has a height which is embodied smaller than a side delimiting wall of the collection facility. This guarantees that initially a specific volume of leakage water is collected in the second subarea and only when this volume is sufficient for a sticking or a calcification to be prevented does it overflow, preferably over the retaining wall, into the first subarea, yet an overflow of the collection facility is still prevented. An escape of collected leakage water from the collection facility can be avoided in this way. Damage to or adverse effects on the function of the home appliance by the overflow of leakage water can also be prevented by this.
Preferably the water-retaining wall is essentially the same height over its entire length. This on the one hand enables an even overflow to be guaranteed. There can however also be provision for the water-retaining wall to be a different height over at least part of its overall length. The water-retaining wall can thus be embodied as required and individually depending on the required construction of the home appliance.

An exemplary embodiment of the invention is explained in more detail below with reference to the schematic drawing. The figures show:

FIG. 1 a perspective view of housing parts of a home appliance;

FIG. 2 a perspective part section of a home appliance;

FIG. 3 a further perspective part section of a home appliance; and

FIG. 4 and FIG. 5 a cross-sectional view through the part sections according to FIG. 3 in each case.

In the figures the same elements or those with the same function have been labeled with the same reference symbols.
FIG. 1 shows parts of a housing of a home appliance for care of laundry items embodied as a washing machine 1. The washing machine 1 comprises side panels 2 and 3 as well as a floor element 4.
A collection facility 5 for leakage water is embodied in the floor element 4. As can be seen from FIG. 1, the collection facility 5 is embodied by a recess in the floor element 4 and thus forms a type of collecting bowl. The collection facility 5 is delimited by side walls 51.
In addition the collection facility 5 features a water-retaining wall 52 which is integrated into the floor element 4 and thereby also into the collection facility 5. The water-retaining wall 52 is embodied in the shape of a curve in the exemplary embodiment and adjoins the side wall 51 of the collection facility 5. The water-retaining wall 52 is embodied as a raised structure and therefore extends upwards.
The collection facility 5 is divided by this water-retaining wall 52 into a first subarea 5 a and a second subarea 5 b. In the first subarea 5 a there is furthermore a spherical positioning structure 53 which is embodied to accommodate a float 81, cf: FIG. 5. This float 81 is be placed approximately on this positioning structure 53, so that the float 81, depending on the water level in the collection facility 5, especially in the first subarea 5 a, can only move vertically upwards and downwards, but is essentially not able to be moved in the horizontal plane.
FIG. 2 shows a perspective diagram of a subarea or of the housing of the washing machine 1 shown in FIG. 1. A first channel 6 is arranged in the area of the side wall 2 and of the floor element 4 which an exemplary embodiment is embodied from plastic. This first channel 6 is embodied for catching water running from above the channel 6 down into it and for directing the water into the collection facility 5 for leakage water. Leakage water can occur in the washing machine 1 if a fault in the controller and/or a mechanical fault occurs in which parts of the washing machine 1 start to leak. For example leaks can occur in this case in the water feed system or from connections of flexible water hoses to any sort of hard support services on water-conducting containers or from connections of sensors or actuators in the tub or other water conducting contains within the washing machine.
In addition bad seals on the housing of the washing machine 1 which above all appear on the front outer side of the relevant washing machine 1 can lead to the escape of leakage water. These types of bad seals can for example occur at rubber hoses which connect the loading opening in the housing of a front-loading washing machine 1 with an opening lying behind it of the swung-suspension tub. Furthermore escape of water from a front wall opening for a detergent dispensing drawer of the washing machine 1 can lead to leakage water.
This leakage water dripping or running respectively on to the channel 6 is directed via spout- shaped projections 61 and 62 into a water guidance system which comprises recesses in the floor element 4 to the collection facility 5. This routing system in floor element 4 is embodied so that the collected water is directed exclusively into the second subarea 5 b of the collection facility 5.
FIG. 3 shows a perspective diagram of a further part section of the washing machine 1. This section shows the embodiment at the transition between the side wall 3 and the floor element 4 and thus on the opposite side to the diagram shown in FIG. 2.
Here too a second channel 7 is arranged, which is also embodied from plastic. The second channel 7 is essentially embodied in the same way as the first channel 6 and includes a spout-type projection 71. The caught water is likewise directed into the second subarea 5 b of the collection facility 5 via this projection 71.
In addition a switch 8 is arranged on a pedestal 72 which is also embodied from plastic and which is connected to the channel 7. This switch 8 enables, after electrical contacting with the float 81 not shown, cf. FIG. 5, which is arranged below the pedestal 72, via a circuit not shown, for a stop valve to be put into its closed position to interrupt the further feed of water from the domestic water supply to the washing machine 1. This allows the aquastop functionality to be guaranteed.
The float 81 arranged below the pedestal 72 is thus located in a first subarea 5 a of the collection facility 5. The water-retaining wall 52 prevents leakage water collected in the second subarea 5 b being able to reach the first subarea even in initially small volumes and reaching the float 81 there, which can cause the latter to stick or calcify with the small volumes of leakage water. The height of this water-retaining wall 52 is around 5 mm and is lower than the height of the side wall 51 of the collection facility 5. The water-retaining wall 52 is embodied to be essentially the same height over its entire curved length. The leakage water located and collected in the second subarea 5 b is retained up to the height of this water-retaining wall 52 and can only then overflow over the water-retaining wall 52 and get into the first subarea 5 a. Through this water-retaining wall 52 which, depending on the mechanical design of the collection facility 5, can also be embodied as completely circular and represents the delimitation of the first subarea 5 a, with small volumes of leakage water prevents a constant filling and drying off of the collection facility leading to a calcification or sticking between the float 81 and the floor area of the collection facility 5 and can thus lead to the aquastop functionality not functioning.
FIG. 4 and FIG. 5 show a sectional diagram along the line AA in accordance with FIG. 3. FIG. 4 shows only the pedestal 72, FIG. 5 additionally shows the float 81 positioned below the pedestal 72. This float is a flat cylinder made of light, especially foam plastic floating on water which sits loosely with a corresponding recess on the positioning structure 53.
A situation is shown in each of these sectional diagrams in which a leakage water W has accumulated in the second subarea 5 b and has been retained by the water-retaining wall of 52 and is prevented from penetrating into the first subarea 5 a. The float 81 sitting on the positioning structure 53 is thus protected against small amounts of leakage water getting underneath it, and sticking and calcification can be prevented in this way. If the water rises further it runs over the water-retaining wall 52 into the subarea 5 a as well, which lifts the float 81 and contacts the switch 8 (cf. FIG. 3) at some point.

Claims

1-8. (canceled)

9. A household appliance for care of laundry items, the household appliance comprising:

a floor;

a collection facility for leakage water arranged on the floor; and

a float arranged in the collection facility,

wherein the float electrically contacts a switch depending on a water level in the collection facility,

wherein the collection facility includes a water-retaining wall that separates a first subarea of the collection facility from a second subarea of the collection facility, and

wherein the float is arranged in the first subarea of the collection facility.

10. The household appliance as claimed in claim 9, wherein the water-retaining wall is integrated into the collection facility.

11. The household appliance as claimed in claim 9, comprising:

a device for catching water running down onto the device from above and for directing the water into the collection facility for leakage water.

12. The household appliance as claimed in claim 11, wherein the device exclusively introduces the leakage water into the second subarea of the collection facility.

13. The household appliance as claimed in claim 9, wherein the water-retaining wall has a curve-shape.

14. The household appliance as claimed in claim 9, wherein a height of the water-retaining wall is between 3 mm and 10 mm.

15. The household appliance as claimed in claim 14, wherein a height of the water-retaining wall is 5 mm.

16. The household appliance as claimed in claim 9, wherein the water-retaining wall is essentially a same height over an entire length of the water-retaining wall.

17. The household appliance as claimed in claim 9, wherein the household appliance is one of a washing machine and a washer-dryer.