FR2786086A1 - LARGE WASTE FILTERING DEVICE FOR HOUSEHOLD WASHING APPARATUS - Google Patents

Abstract

The invention relates to a coarse waste filtering device (14) for a filtering system (10) fitted to a wash water discharge tank of a household appliance. The tank comprises in particular an emptying well (13) for the dirt entrained by the washing water, the coarse waste filtering device being placed in the emptying well. The device according to the invention has substantially the shape of a basket, advantageously removable. It includes a baffle making it possible to stop large waste of elongated shape, formed for example of two substantially horizontal blades, and it is closed by coarse filtering means making it possible to collect any other type of waste. It is also provided with side openings (16) arranged so as to block large waste while allowing better flow of the washing water.

Description

The invention relates to a device for filtering large waste for a

  filtering system fitted to a washing water discharge tank of an appliance washing appliance, for example of the dishwasher or washing machine type. In this type of device, the term "drainage tank" means the tank placed at the bottom of the device, equipped with a filtering system, and in particular comprising the cycling system making it possible to circulate the filtered water during the washing cycle, as well as the washing water draining system, allowing the washing water to be emptied during the draining cycle. The filter system comprising different filter elements, each having a specific function in the washing and emptying cycles of the device. The tank comprises in particular, in its emptying system, a well for emptying the dirt entrained by the washing water, this well may be a laterally closed tube or a filter element. During the drain cycle of the device, dirt is sucked by means of a drain pump to a drain channel. A 'large waste' filtering device can be placed in the drain well to protect the drain pump in particular against a certain type of soiling, hereinafter called 'large waste', which could lead to obstruction or deterioration. of the pump. However, it must not prevent the washing water from circulating with a sufficient flow, so as not to interfere with the running of the operating cycles.

of the device.

  A solution is proposed in BOSCH patent FR 2714282, which implements a large waste filtering device having the form of a tube open on both sides, the envelope of this tube being closed, and in which are arranged means for current deviation. These deflection means, constructed in the form of transverse fins arranged so as to cut the direction of the current, make it possible to stop large waste of the elongated type (for example toothpicks, bones, etc.). But above all, the arrangement of these deflection means (advantageously fins inclined downward), combined with the structure of the filter, forming a tube whose envelope is closed and which is open downward, produces a movement of the liquid. of washing circulating in the filter which allows in particular to entrain soft waste of large surface (for example the skins of milk, vegetables, etc.), waste which is safe for the pump but which

  could clog the large waste filter.

  However, the acceleration to the bottom of the flow of washing water thus obtained, risks causing other types of waste which, in turn, could clog the pump. This is the case, for example, of pieces of aluminum foil, for example yoghurt lids, or large round-shaped waste (for example olive stones), or other types of large waste such as shards of glass, pieces of shells, etc. To overcome this drawback, the present invention provides a filtering device having substantially the shape of a basket, making it possible to collect all types of large waste, without hampering the evacuation of

wash water. -.

  More specifically, it is a large waste filtering device for a filtering system equipping a tank for discharging the washing water of an appliance washing appliance, the tank comprising in particular a dirt draining well. entrained by the washing water, the large waste filtering device being disposed in the drain well and comprising a baffle making it possible to stop large waste of elongated shape. The filtering device is characterized in that it has substantially the shape of a basket, in that it is closed by coarse filtering means making it possible to collect any other type of large waste, and in that it is provided with side openings arranged to block large

  waste while allowing better flow of washing water.

  In addition to its effectiveness in terms of filtering large waste, the device according to the invention, in the form of a basket, makes it possible to maintain a sufficient flow of washing water in the drain well and ensures ergonomic and hygienic use for the user since all waste

will remain blocked in the basket.

  Other advantages and characteristics of the invention will appear

  on reading the description which follows, illustrated by the appended figures

  representing: - Figure 1, an example of a filtering system of a dishwasher, comprising a large waste filtering device according to the invention; - Figure 2, a section of the large waste filtering device of Figure 1; - Figures 3A and 3B, sections of elements of the device

  large waste filtering in Figure 1.

  In these figures, the homologous elements are referenced by the

same benchmarks.

  FIG. 1 represents an example of a filtering system 10 fitted to an evacuation tank in a dishwasher. Only the filtering system is shown here. In this example, it comprises a main l0 filter 1 1 with a fine mesh, a microfilter 12, these two filters making it possible to filter the water during the washing cycle, and a filtering drain well 13. The shape of the main filter as well as the circulation of the washing water in the dishwasher tub will lead to dirt to the drain well. In this example, the drain well is filtering, also serving in the cycling circuit. The device 14 for filtering large waste according to the invention is placed in the drain well, for example clipping inside. It has substantially the shape of a basket, it is advantageously removable, provided with a handle 15, allowing the user to remove it easily, independently of the other elements of the filtering system which can remain fixed. The user will thus be able to clean the basket forming the large waste filtering device outside the dishwasher, without direct contact with the waste. On the other hand, as the other filter elements remain fixed, there will be no risk of contamination of the cycling system by this waste when the basket is removed. In this example, the large waste filtering device is of oval section; of course, other forms

sections would be acceptable.

  The large waste filtering device according to the invention makes it possible to collect all types of large waste. By 'large waste' is meant a certain type of soiling, which could lead to obstruction or deterioration, in particular of the drain pump. The size and shape of this large waste are therefore a function of the pumps used as well as the pipes going to these pumps. In particular, the filtering device according to the invention comprises a baffle making it possible to stop large waste of elongated shape (toothpicks, pieces of wood, etc.). This baffle is for example formed by two blades extending from the internal walls of the basket towards the interior of the basket, as shown in section in FIG. 2. The blades, denoted 21, are preferably horizontal in order to reinforce blocking this type of waste. Each of these blades closes a part of the cross section of the basket, so that the meeting of these two parts covers the entire section. Thus, no large elongated waste, as fine as it may be, can slip between the blades. Advantageously, each closed part is slightly greater than half the section of the device. In this example, the baffle is placed in the bottom of the basket, thus allowing the collection of large waste, including large waste of the elongated type, without risking that it may fall from the

  basket formed by the device according to the invention, in particular when it

  this is handled by the user. In addition, according to this example, the blades are spaced apart in the direction of the height of the device by a sufficiently small distance making it possible to block large waste, other than waste of the elongated type, while allowing a maximum flow rate of passage. wash water. For example, in a household dishwasher application, this distance could be about half a centimeter, which makes it possible to stop large waste such as olive kernels, shards of glass or shells, etc. can obstruct or deteriorate the type of pump generally used in this

device type.

  In addition to the presence of this baffle, the device for filtering large waste according to the invention is closed by means of coarse filtering making it possible to collect any type of large waste other than large waste of the elongated type. By 'coarse' we mean a filtering leaving

  pass the maximum amount of washing water while blocking large waste.

  These coarse filtering means make it possible in particular to block all large waste such as aluminum sheets, paper, etc. It could for example be a rough grid closing the basket. According to the example of implementation illustrated in FIG. 2, these filtering means consist of two coarse filters each extending one of the blades 21. The assembly formed by the blade and the filter covers the entire section of the device and can stop all types of large waste. The whole big waste filtering function is here

  made on two levels, advantageously placed towards the bottom of the basket.

  For example, and to ensure the best possible flow of water from

  washing, each coarse filter forms a grid 22 provided with bars.

  The gap between these bars is maximum, while ensuring the blocking of large waste. In this example, due to the presence of the two blades, the spacing of which already makes it possible to block part of the large waste, it is possible to accept a difference between the bars slightly greater than the spacing between the blades. In order for these filtering means to be as effective as possible, the orientation of the bars of a grid is advantageously substantially perpendicular to the orientation of the

bars of the other grid.

  In order to ensure a better flow of the washing water through the coarse waste filtering device, the latter is provided with lateral openings 1 5, denoted 16 in FIG. 1. These openings are particularly important when a certain a number of large wastes remain blocked in the basket forming the filtering device, limiting the circulation of the washing water towards the bottom of the basket. These openings are arranged to block large waste while allowing better flow of washing water. For example, as illustrated in FIG. 1, they can be of longilinear shape, in an orientation substantially perpendicular to the height of the large waste filtering device, so as not to allow large longilinear type waste to pass, the waste elongated arriving in the device in an orientation substantially parallel to that of the height of the device. Advantageously, these openings are arranged over the entire height of the large waste filtering device. FIGS. 3A and 3B show in section the blade assemblies and

  grid formed according to the example of the filtering device of FIGS. 1 and 2.

  The blades 21 in this example form half-moons, slightly overlapping. They are extended by the grids 22, the orientations of the bars of these grids being substantially perpendicular. It can be seen in FIG. 3A, that the upper grid 22 is locally closed (reference 31). Indeed, depending on the geometry of the large waste filtering device and that of the drain well, it may be necessary to locally close the coarse filtering means and / or the side openings, in order to prevent the possible passage of a large waste. elongated

  in the free space between the filter basket and the drain well.

  It could indeed happen, if this free space is sufficient, that a large elongated waste toothpick type, finds a passage through a grid 22 and an opening 1 6, and is then found in the drain well. In general, we will try to optimize the shape and size of the coarse filtering means, like those of the side openings, in order to allow optimal flow, depending on the geometry of the drainage well and that of the large waste filtering device. washing water without risking any type of large waste going into

the drain well.

  According to an alternative embodiment, the top of the device, noted 17 in FIG. 1, can form a sort of funnel, facilitating the entrainment of large waste inside the filtering device 14. For example, the shape of the top of the basket 17 extends that of the main filter 11. Advantageously, this top of the basket 17 is pierced with openings 18 allowing better flow of the washing water. These openings are advantageously slightly smaller than those of large waste in order to block

  their passage at the top of the basket forming the device 14.

  Although the invention has been described with reference to a particular embodiment, modifications in the form or in the details of embodiment can be carried out without departing either from the spirit or from the field of the invention.

Claims (10)

  1- Device (14) for filtering large waste for a filtering system (10) equipping a tank for discharging the washing water of an appliance washing appliance, the tank comprising in particular a drain well (13) for soiling entrained by the washing water, the device (14) for filtering large waste being disposed in the drain well (13) and comprising a baffle (21) making it possible to stop large waste of elongated shape, the device for filtering being characterized in that it has substantially the shape of a basket, in that it is closed by means (22) of coarse filtering making it possible to collect any other type of large waste, and in that it is provided side openings (16) arranged to block large   waste while allowing better flow of washing water.   2- Filtering device according to revendi.cation 1, characterized in that the baffle is formed of two substantially horizontal blades (21), extending from the internal walls of the device towards the interior of the device, spaced in the direction of the height of the device by a predetermined distance further allowing blocking of large waste other than that of elongated shape, each of the blades closing part of the cross section of the basket, so that the union of these two   parts covers the entire section.   3- A filtering device according to claim 2, characterized in that each closed part is slightly greater than half of said section.   4- filtering device according to one of claims   previous, characterized in that the baffle is placed in the bottom of the basket.   - Filtering device according to one of claims   above, characterized in that the baffle being formed by two blades spaced in the direction of the height of the device by a predetermined distance, the coarse filtering means consist of two coarse filters, the filters each extending one of said blades, I ' together   formed of the blade and the filter covering the entire section of the basket.   6- filtering device according to claim 5, characterized in that each coarse filter forms a grid (22) provided with bars, the orientation of the bars of a grid being substantially perpendicular to   that of the bars of the other grid.   7- Filtering device according to one of claims   previous, characterized in that the side openings (16) are arranged substantially over the entire height of the basket.   8- Filtering device according to one of claims   previous, characterized in that the lateral openings are of slender shape, in an orientation substantially perpendicular to the height from the basket.   9- Filtering device according to one of claims   above, characterized in that the coarse filtering means and / or the side openings are locally closed to prevent a possible passage of a large waste of elongated shape in the free space located between   the large waste filtering device and the drain well.   10- Filtering device according to one of claims   previous, characterized in that the top of the device (17) substantially forms a funnel, facilitating the entrainment of large waste inside the basket, and pierced with openings (18) allowing better washing water flow.   11- Filtering device according to one of claims   above, characterized in that it is removable, independently of the   other elements of the filtering system.