WO2016096350A1

WO2016096350A1 - Laundry drum with perforated rear drum wall

Info

Publication number: WO2016096350A1
Application number: PCT/EP2015/077646
Authority: WO
Inventors: Vladimir Baecker; Kai-Uwe Bache; Alexander Drebant
Original assignee: BSH Hausgeräte GmbH
Priority date: 2014-12-15
Filing date: 2015-11-25
Publication date: 2016-06-23
Also published as: DE102014225873A1; PL3234252T3; CN107002337A; EP3234252A1; EP3234252B1; CN107002337B

Abstract

A rotatable laundry drum 2 has a drum casing 4 and a rear drum wall 14, wherein the rear drum wall 14 has at least one perforated air-passage region 15, 15a, wherein at least one non-perforated embossed formation 17, which is oriented in the direction of a drum interior, is made in the perforated air-passage region 15, wherein the at least one embossed formation 17 has at least one radially outwardly extending rib 18, and wherein the rib 18 is curved in the direction of rotation of the laundry drum 2. A laundry-drying appliance 1 has such a laundry drum 2. The invention can be applied in particular advantageously to tumble dryers or washer-dryers, in particular ones which use circulating air.

Description

Laundry drum with perforated drum back wall

The invention relates to a rotatable laundry drum, comprising a drum shell and a drum rear wall, wherein the drum rear wall has at least one perforated air passage area. The invention further relates to a laundry drying apparatus with such a laundry drum. The invention is particularly advantageously applicable to tumble dryer or washer-dryer, in particular recirculating air dryer.

To achieve a uniform drying result, the laundry in the dryer drum is moved and mixed. This requires good contact between the laundry and the drum surface. At the same time there is always a relative movement between the laundry and the drum surface. This has the consequence that the laundry is exposed to mechanical and thermal stresses, which can lead to a laundry wear.

DE 198 28 243 A1 discloses a laundry treatment machine, in particular a laundry dryer, with a laundry drum rotatably mounted in a washing tub and a drying air inlet and an air outlet area. In order to achieve not only an optimal utilization of the available laundry drum volume but also a shortening of the drying process, the laundry drum has an inwardly deformed or drawn drum rear wall, which is perforated over the entire surface with holes. Between the drum rear wall and the tub, a seal is provided. The drum rear wall is rotatable with the remaining laundry drum. DE 10 2006 061 210 A1 discloses a drum for a household appliance for the care of laundry items, which is cylindrical and comprises a rear wall and a jacket, wherein a Verwirrschutzeinrichtung is arranged for untangling the laundry items with rotating drum on the rear wall and into the interior the drum extends.

DE 10 162 918 A1 discloses a laundry drum for a laundry treatment machine, wherein the laundry drum is rotatably mounted within the housing of the laundry treatment machine, preferably a washing machine, and at least one floor has disc and a jacket. These two components each consist at least partially of sheet metal and are provided individually or both with a directed towards the drum interior vault structure. In order to make the components stiffer, to improve their draining ability and to promote their appearance, the arch structure is formed from spherical calottes directed towards the interior of the drum.

EP 2 592 184 A1 discloses a clothes dryer with a laundry drum whose drum shell is rotatable against a stationary drum rear wall. It is the object of the present invention to overcome the disadvantages of the prior art at least partially, and in particular to provide an improved way to make contact of laundry with the laundry drum so that a good mixing and movement of the laundry in the laundry drum at a simultaneous Reduction of the laundry load is achieved.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims and the following description and attached drawing removable. The object is accordingly achieved by a rotatable laundry drum, comprising a drum shell and a drum rear wall, wherein the drum rear wall has at least one perforated air passage area, wherein in the perforated air passage area at least one pointing in the direction of a drum interior, non-perforated embossment is introduced, wherein the at least one Embossing has at least one radially outwardly extending rib and wherein the rib, in particular in the direction of rotation (generally but possibly also counter to the direction of rotation) of the laundry drum extends curved.

This laundry drum has the advantage that the embossing or embossing area can serve as a stationary driver, which causes an increased movement of the laundry. In addition, the embossing reduces the contact of the laundry with the drum rear wall, so that the laundry rubs less on the drum rear wall, which reduces abrasion of lint from the laundry. Due to the lack of perforation or the dense surface of the embossing of the abrasion is further reduced because the laundry is not through Holes of the perforation is rubbed off. The lack of perforation gives the further advantage that where the laundry is pressed particularly strongly against the drum rear wall, no warm air blows directly onto the laundry, which reduces thermal stress. The perforation-free embossing also causes a stiffening of the drum rear wall, which allows material savings, such as a reduction of a sheet thickness, and thus a cost reduction.

This laundry drum has the further advantages that it allows a particularly effective entrainment and reduction of the circulation of the laundry on the perforated area. A curvature and / or an angle of attack of the at least one rib can be flexibly adapted to requirements for a desired laundry case.

The perforated air passage area may have regular or irregular perforations. The perforation may have the same or different shaped holes, e.g. round and / or slotted holes.

The embossing is, in particular, a stamping not continuous in the circumferential direction of the drum rear wall or the direction of rotation, that is to say, in particular, no embossing that is continuous rotationally symmetrical exclusively about an axis of rotation of the drum rear wall. On the contrary, when considering at least one annular region of the drum rear wall centered about the axis of rotation, an embossing will be present adjacent to a perforated partial region. The drum shell of the laundry drum may be formed on the front side so that it can be mounted rotatably directly on a bearing plate or housing. In particular, in this case can be dispensed with a drum front wall. The open front of the laundry drum may then serve as a feed opening. Alternatively, the laundry drum may have a drum front wall which surrounds a feed opening and which e.g. can be used for front rotatable mounting of the laundry drum.

The drum back wall also likes as a rear drum bottom or simply

Drum floor are called. It is an embodiment that the drum shell is rotatable against the stationary drum rear wall. In this embodiment, the movement of the laundry is transmitted only by the movement of the drum shell and possibly the drum front wall (if present and rotatable). The drum rear wall, however, is firmly connected to a rear end shield or to a rear wall of the device and does not rotate with it. This results in a larger relative movement between the laundry and the drum rear wall than in a co-rotating drum rear wall. In addition, the standing drum rear wall can be used directly to guide the heated air, which allows a higher volume flow through the laundry drum. The relatively high relative movement between the laundry and the stationary drum rear wall in comparison with the co-rotating drum rear wall and the higher thermal load of the laundry in direct contact with the stationary drum rear wall (since this is used directly to guide the heated air and therefore a higher temperature than the drum can have at least balanced or even overcompensated by the provision of the embossing.

It is a further embodiment that the at least one embossment is centered. This allows a particularly effective stiffening and prevents twisting there lying laundry.

It is yet another embodiment that the embossing has a plurality of centrally located ribs, which are arranged distributed in the same direction at right angles. Thus, a particularly effective laundry removal and laundry lift is provided by the embossing area. The number of ribs may e.g. two, three, four, five or even more.

It is also an embodiment that at least one embossment has a radial distance to an outer edge of the perforated air passage area. This enables a particularly high air flow rate.

It is an additional or alternative embodiment that at least one embossing extends to an outer edge of the perforated air passage area. This gives the advantage of a particularly effective reinforcement of the drum rear wall. It is also an embodiment that an inwardly curving edge region of the drum rear wall is perforationslos formed. This embodiment is advantageous because the laundry can rest particularly strongly on such an edge region and therefore would also be charged there if the edge region were perforated.

The object is further achieved by a drum rear wall as described above.

The object is also achieved by a laundry drying apparatus, comprising a laundry drum as described above. The laundry dryer can be designed analogously to the laundry drum and gives the same advantages.

The laundry drying apparatus is in particular a household appliance, in particular in the sense of "white goods". The tumble dryer may be a stand-alone tumble dryer or a combined laundry / drying machine or washer-dryer. The clothes dryer may be an exhaust air dryer or a circulating air dryer. In particular, in the case of a circulating air dryer, the laundry drying device may have a heat pump or be a heat pump tumble dryer. The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an embodiment which will be described in detail in connection with the figures of the accompanying drawings. Show it:

Figure 1 in front view obliquely from components of a tumble dryer including a laundry drum;

FIG. 2 shows a frontal view of the drum rear wall of the laundry drum from FIG. 1; FIG. and Figure 3 is a frontal view of a drum rear wall. 1 shows a plurality of components of a tumble dryer 1, including a laundry drum 2 and at least part of a rear housing wall 3. The laundry drum 2 has a frontally open, hollow cylindrical drum shell 4 whose rear end face 5 is covered by a stationary or stationary drum rear wall 6 is.

The drum shell 4 is rotatable about its (horizontal here) longitudinal or symmetry axis. For this purpose, a belt 7 is tensioned in the circumferential direction about an outer side of the drum shell 4, which belt can be driven by means of a motor 8 in order to move the drum shell 4 along. The drum shell 4 is mounted on rollers 9. The drum shell 4 thus rotates against the drum rear wall 6 or relative to the drum rear wall 6.

During operation of the tumble dryer 1 warm, comparatively dry air flows through the drum rear wall 6 into the interior of the laundry drum 2 and can absorb moisture there from the laundry. The then humid air can escape from a serving as a feed opening 10 front end face. In a circulating air dryer, the humid air is cooled following, whereby it condenses out, and then heated again, and then again passed through the drum rear wall 6 in the interior of the laundry drum 2. The condensing and heating can be carried out, for example, by means of a heat pump.

The drum shell 4 and / or the drum rear wall 6 can be present as sheet metal parts, in particular as stamped / bent parts. The drum rear wall 6 is formed at its outer, annular edge portion 1 1 for rotatable engagement with a rear edge of the drum shell 4. The drum shell 4 may be formed like a fold. An adjoining central, annular transition region 12 separates the edge region 11 from a plane central region 13. The transition region 12 extends obliquely from the central region 13 bent at the front. The transition region 12 and the central region 13 serve as perforated air passage areas and are each perforated with eg circular holes. A disadvantage here is that laundry rests closely against the perforated regions 12 and 13 and is thus subjected to mechanical and thermal stress, in particular also at the transition region 12.

3 shows a frontal view of a drum rear wall 14 according to the invention. This can be used instead of the drum rear wall 6 with the laundry drum 2 in the tumble dryer 1.

In contrast to the drum rear wall 6, the drum rear wall 14 has only the central region 15 as at least partially perforated air passage area, while the transition region 16 is not perforated. The lack of perforation of the transition region 16 reduces mechanical abrasion of laundry sliding thereon, as well as thermal stress from direct contact with warm air.

In the central region 15, a non-perforated embossment 17 pointing in the direction of the interior of the drum (ie forward) is introduced into the perforated subregion 15a. The embossment 17 has four ribs 18 located at a center of the central area 15 and extending outwardly (i.e., radially) therefrom. The ribs 18 are equally distributed in the circumferential direction (about the longitudinal axis) and curved in (in this view in the clockwise direction) rotational direction of the drum shell 4. The ribs 18 do not extend to an outer edge of the central region 15, but leave a radial distance.

By embossing 17 is achieved that laundry no longer presses so much on the perforated area 15a and therefore is no longer so heavily mechanically loaded when sliding along with rotating drum shell 4. Also, a thermal load is reduced by the warm drum rear wall 14 and the warm air. The ribs 18 of the embossment 17 serve as stationary "driver" or Umwälzbereiche for additional movement of the laundry. Of course, the present invention is not limited to the embodiment shown.

So there may be more than one imprint.

In addition, in addition to four ribs, only one rib, two ribs, three ribs, five ribs, etc. may be used. At least one rib, in particular all ribs, may extend to the edge of the central region. For example, a bend angle, angle of attack, width and / or length, etc. of the rib (s) may be varied to achieve a desired wash fall. In particular, the at least one rib can also be rectilinear. However, the embossing is not limited to the presence of a rib. Thus, at least one embossing may also have a different, in particular not uniform ring-like shape. For example, the central area may have a plurality of camber-shaped or knob-like projections, which are distributed in particular over the central area.

The central region may be flat or curved in cross-section (parallel to the longitudinal axis of the drum shell).

LIST OF REFERENCE NUMBERS

1 tumble dryer

2 laundry drum

3 Rear housing wall

4 drum jacket

5 Rear face

6 drum rear wall

7 straps

8 engine

9 rolls

10 feed opening

1 1 edge area

12 transition area

13 Central area

14 drum rear wall

15 Central area

15a Perforated section

16 transition area

17 embossing

18 rib

Claims

1. Rotatable laundry drum (2), comprising a drum shell (4) and a drum rear wall (14), wherein

the drum rear wall (14) has at least one perforated air passage area (15, 15a),

- in the perforated air passage area (15) at least one pointing in the direction of a drum interior, non-perforated embossment (17) is introduced,

- The at least one embossment (17) has at least one radially outwardly extending rib (18) and

- The rib (18) extends in the direction of rotation of the laundry drum (2) curved.

Laundry drum (2) according to claim 1, wherein the drum shell (4) is rotatable against the stationary drum rear wall (14).

Laundry drum (2) according to one of the preceding claims, wherein the at least one embossment (17) attaches in the middle.

Laundry drum (2) according to claim 3, wherein the embossing (17) has a plurality of centrally located ribs (18) which are arranged distributed in the same direction at right angles.

Laundry drum (2) according to one of the preceding claims, wherein at least one embossment (17) has a radial distance to an outer edge of the perforated air passage area (15).

Laundry drum according to one of the preceding claims, wherein at least

an embossment extends to an outer edge of the perforated air passage area. Laundry drum (2) according to one of the preceding claims, wherein an inwardly curving edge region (16) of the drum rear wall (14) is formed without perforation.

Laundry drying apparatus (1), comprising a laundry drum (2) according to one of the preceding claims.