[0001] The present invention relates to a laundry dryer or combo washer dryer which provides
for drying laundry by means of a drying air flow, in which the moist drying air from
the laundry compartment passes through a fluff trap before entering into a heat exchanger
for the moisture extraction by means of condensation.
[0002] In a closed drying circuit with an electrical resistor or a heat pump, the warm and
dry drying air is conveyed into the laundry compartment, in particular a basket or
drum, where, by passing through the wet laundry, it causes the evaporation of the
water contained in the fabrics. After exiting the laundry compartment, the drying
air loaded with moisture passes through a heat exchanger where it is cooled down,
in order to extract the moisture therefrom by means of condensation. The dehumidified
drying air is then sucked in again by the ventilator, heated and routed into the laundry
compartment.
[0003] Upstream of the heat exchanger (where the moisture extraction occurs) a fluff trap
is arranged to protect the heat exchanger from pollution and sedimentation of substances
extracted from the laundry together with the moisture, for example hair, fabric fibers,
detergent residues, which would otherwise reduce the heat exchange efficiency and
therefore the performance of the dryer.
[0004] In the case of a laundry dryer with a heat pump, the fluff trap is arranged upstream
of the cooling heat exchanger (embodied by the heat pump evaporator) to protect both
the latter and a subsequent heating heat exchanger (embodied by the condenser of the
heat pump) from pollution and sedimentation of substances extracted from the laundry
together with the moisture, for example hair, fabric fibers, detergent residues, which
would otherwise reduce the heat exchange efficiency and therefore the performance
of the dryer.
[0005] The additional fluff traps must be regularly extracted from the laundry dryer and
cleaned by the user (usually after each drying cycle). The positioning of the fluff
traps in the lower part of the laundry dryer and the need to first open the base and
extract and re-insert the fluff trap in a leaning posture create discomfort for the
user.
[0006] Automatic fluff trap cleaning systems in laundry dryers are known, in which a flow
of condensed water is allowed to flow along the fluff trap to soak and remove the
fluff from the filter wall.
[0007] Automatic fluff trap cleaning systems in laundry dryers are also known, in which
a movable scraping member is allowed to slide along a stationary filter wall to scrape
away the fluff deposits.
[0008] The filtering systems of the background art and in particular the cleaning methods
thereof are not yet satisfactory and it is desirable to have self-cleaning or partially
self-cleaning fluff traps for laundry dryers, having features such as to obviate the
need for frequent extractions, cleaning and re-insertions of the fluff trap into the
household appliance.
[0009] This and other objects are achieved by a fluff trap and by a laundry dryer according
to the appended claims.
[0010] According to an aspect of the invention, a laundry dryer comprises a housing which
houses a laundry compartment, in particular a rotatable drum or basket, a drying air
circuit which includes the laundry compartment, a heat exchanger for extracting moisture
from the drying air, as well as a fluff trap positioned in the drying air circuit
downstream of the laundry compartment and upstream of the heat exchanger, in which
the fluff trap comprises a filter support structure, a sieve-filter wall supported
by the filter support structure and a filter cleaning system configured to brush and/or
scrape the fluff trap sieve-filter wall mounted in the laundry dryer,
[0011] characterized in that the filter cleaning system comprises:
- one or more spray nozzles supported by the filter support structure and configured
to spray one or more pressurized water jets on the filter wall to soak and detach
fluff from the filter wall, and
- a scraping member supported by the filter support structure in a scraping abutment
against the filter wall,
- a filter movement device configured to move the filter wall with respect to the filter
support structure and with respect to the scraping member so as to brush the soaked
fluff away from the filter wall.
[0012] By virtue of the combined effect of pressurized water jets and mechanical brushing,
when moving the filter wall with respect to the scraping or brushing member:
- it is not necessary to remove and clean the fluff trap manually at each drying cycle,
- the mechanical and soaking effect of pressurized water provides a "prewash" of the
filter wall, while the mechanical brushing removes fluff residues from the filter
wall.
- it is not necessary to perform movements or significant movements with the scraping
member which solidly involves considerable space problems in the fluff trap area,
- a movement of the filter wall, for example, in the development plane thereof along
the scraping member (and not vice versa), does not require significant additional
space and allows to perform a scraping or a brushing in the presence of a stationary
or substantially stationary reaction support of the filter wall, which ensures a more
reliable scraping pressure and avoids undesired deformations of the filter wall under
the action of the scraping member.
- by moving the filter wall with respect to the scraping member (and not vice versa)
it is also easier to collect and control the further handling and transport of the
fluff brushed away from the filter wall at the scraping member.
[0013] According to a further aspect of the invention, the laundry dryer comprises an electronic
control system, which can be programmed by the user to select or set respectively
one of a plurality of drying cycles, and is configured to automatically activate the
filter cleaning system, for example, according to the execution of the drying cycles.
[0014] To better understand the invention and appreciate the advantages thereof, a number
of non-limiting embodiments will be described below, with reference to the drawings,
in which:
Figure 1 shows a diagrammatic representation of a closed drying circuit with a heat
pump, implemented in a laundry washing machine or combo washer dryer in accordance
with the invention;
Figure 2 shows a diagrammatic representation of a closed drying circuit with an electrical
resistor, implemented in a laundry washing machine or combo washer dryer in accordance
with the invention;
Figure 3 shows a diagrammatic side view, according to a vertical section plane, of
the laundry dryer with the indication of the drying air flow;
Figure 4 shows a diagrammatic top view according to a horizontal section plane, of
the laundry dryer in Figure 3 with the indication of the drying air flow (continuous
arrows) and of a cooling air flow (dashed arrows);
Figure 5 shows a side view of a self-cleaning fluff trap according to an embodiment;
Figure 6 shows a front view of the self-cleaning fluff trap in Figure 5;
Figure 7 shows an enlarged view of a detail in Figure 5,
Figure 8 shows a diagrammatic view of a self-cleaning fluff trap according to a further
embodiment.
[0015] With reference to
Figures 1 to 4, a laundry dryer 1 comprises a housing 2 which houses a laundry compartment 3, in
particular a drum or basket rotatable by means of a motor 4, an air circuit 5 for
the drying air 6 which includes the laundry compartment 3, a heat exchanger 7 for
extracting moisture from the drying air 6, as well as a fluff trap 8 positioned in
the air circuit 5 downstream of the laundry compartment 3 and upstream of the heat
exchanger 7.
[0016] In accordance with the invention, the fluff trap 8 comprises a filter support structure
10, a sieve-filter wall 9 supported by the filter support structure 10 and a filter
cleaning system 11 configured to brush and/or scrape the filter wall 9 (with the fluff
trap 8 mounted in the laundry dryer 1).
[0017] The filter cleaning system 11 comprises:
- one or more spray nozzles 12 supported by the filter support structure 10 and configured
to spray one or more pressurized water jets 13 on the filter wall 9 to soak and detach
fluff 14 from the filter wall 9, and
- a scraping member 15 supported by the filter support structure 10 in a scraping position
against the filter wall 9,
- a filter movement device 16 configured to move the filter wall 9 with respect to the
filter support structure 10 and with respect to the scraping member 15 so that the
scraping member 15 brushes the soaked fluff 14 away from the filter wall 9.
[0018] By virtue of the combined effect of the pressurized water jets 13 and mechanical
brushing, when moving the filter wall 9 with respect to the scraping member 15:
- it is not necessary to remove and clean the fluff trap 8 manually at each drying cycle,
- the mechanical and soaking effect of pressurized water provides a "prewash" of the
filter wall 9, while the mechanical brushing removes fluff 14 residues from the filter
wall 9,
- it is not necessary to perform movements or significant movements with the scraping
member 15 which would otherwise involve considerable space problems in the fluff trap
area,
- a movement of the filter wall 9, for example, in the development plane thereof along
the scraping member 15 (and not vice versa), does not require significant additional
space and allows to perform a scraping or a brushing in the presence of a stationary
or substantially stationary reaction support of the filter wall 9, which ensures a
more reliable scraping pressure and avoids undesired deformations of the filter wall
9 under the action of the scraping member 15.
- by moving the filter wall 9 with respect to the scraping member 15 (and not vice versa)
it is also easier to collect and control the further handling and transport of the
fluff 14 brushed away from the filter wall 9 at the scraping member 15, which can
be stationary or substantially stationary.
[0019] In accordance with an embodiment, the filter support structure 10 can comprise a
filter housing, for example a frame or a grille made of plastic or metal material.
[0020] The filter housing may form an inlet opening 17 for the inlet of the air flow 6 coming
from the laundry compartment 3, as well as one or more outlet openings 18 for the
outlet of the air 6 after the filtering.
the filter support structure 10 or the filter housing supports the filter wall 9,
for example at the inside thereof, so that an inlet surface 19 of the filter wall
9 faces against the direction of the flow of drying air 6 or, in other words, towards
the inlet opening 17, and an opposite outlet surface 20 of the filter wall 9 faces
in the direction of the flow of air 6 or, in other words, towards the outlet opening
18. Thereby, the fluff transported by the air flow 6 is deposited on the inlet surface
19 of the filter wall 9.
[0021] The filter wall 9 may consist of a mesh or a fabric made of a synthetic polymeric
material, possibly reinforced with glass or carbon fibers or, alternatively, of a
metal material, or of a perforated sheet of a synthetic or metal material. The fluff
trap 8 is preferably positioned in a front area of the laundry dryer 1, below the
laundry compartment 3.
[0022] According to one embodiment, the movement device 16 comprises one or more, preferably
two but possibly three or more, spools 21 or drums, at least one, more or all of which
can be actuated in rotation, for example, by means of one or more electric motors
22. The filter wall 9 is supported by said spools 21, for example wound about, or
supported by and/or returned on, one or more of said spools 21, so that the rotary
actuation of the one or more spools 21 moves the filter wall 9 in scraping or brushing
contact against the scraping member 15.
[0023] According to an advantageous embodiment, the movement device 16 comprises two spools
21 spaced apart from each other, which can be actuated in rotation by means of a single
electric motor 22. The filter wall 9 is supported by said spools 21, so that:
- the rotary actuation of the two spools 21 in a first rotational direction 23 unwinds
the filter wall 9 from a first spool 21' of the two spools 21 and winds the filter
wall 9 on a second spool 21" of the two spools 21, keeping the filter wall 9 pulled/pull-tensioned
between the first spool 21' and the second spool 21" and always in scraping or brushing
contact against the scraping member 15,
- the rotary actuation of the two spools 21 in a second rotational direction 24 unwinds
the filter wall 9 from the second spool 21" of the two spools 21 and winds the filter
wall 9 on the first spool 21' of the two spools 21, keeping the filter wall 9 pull-tensioned
between the first spool 21' and the second spool 21" and possibly always in scraping
or brushing contact against the scraping member 15.
[0024] Advantageously, the first spool 21' is arranged higher than, preferably vertically
above, the second spool 21', so as to keep the filter wall 9 pull-tensioned in a vertical
or at least approximately erected filtering plane 25 between said first 21' and second
21" spools.
[0025] The electric motor 22 can be coupled to a synchronization or differential transmission
26 which transmits the motion, in a planned manner, to the spools 21, 21', 21'.
[0026] Advantageously, the filter wall 9 is supported and pull-tensioned by the one or more
spools 21, 21', 21" so as to be extending along an extension path 27 between end paths
28, in which, during the movement of the filter wall 9 in scraping contact against
the scraping member 15, the extension path 27 remains substantially unchanged and
at least one or more of the end paths 28 undergo a variation of the winding length.
[0027] The invariability of the extension path 27 saves space and allows an easier washing
of the filter wall by means of the spray nozzles 12.
[0028] According to an embodiment, the scraping member 15 comprises one or more scrapers
or brushes:
- stationary, or
- movable by means of a scraper actuator 29 thereof, for example, an electric motor,
or
- movable by means of the same actuator (motor 22) of the filter movement device 16,
and in contact with (the inlet surface 19 of) the filter wall 9 so as to clean it
from the attached fluff 14.
[0029] According to one embodiment, the fluff trap 8 forms a reaction surface 30 arranged
at the scraping member 15, but on the side of the filter wall 9 opposite with respect
to the side (inlet surface 19) on which the scraping member 15 acts, so as to form
an abutment for the thrust of the scraping member against the filter wall 9 and avoid
undesirable deformations of the latter.
[0030] According to one embodiment, the reaction surface 30 is formed by one of the spools
21 or by a portion of a filter wall wound on one of the spools 21.
[0031] According to an alternative embodiment, the reaction surface 30 is formed at a distance
from the spool or spools 21.
[0032] According to a preferred embodiment, the scraping member 15 is kept in contact against
the filter wall 9 at one of the spools 21, preferably at the aforesaid second (lower)
spool 21".
[0033] Advantageously, the scraping member 15 is positioned below (preferably vertically
below) the aforesaid second (lower) spool 21" and in contact from below against the
filter wall 9.
[0034] According to one embodiment, the scraping member 15 comprises a linear brush extending
in a direction transverse with respect to the movement direction of the filter wall
9 and/or extending parallel to the rotation axis of the spool 21 with which it is
associated.
[0035] According to one embodiment, the scraping member 15 can be moved in a direction transverse
with respect to the movement direction of the filter wall 9 and/or parallel to the
rotation axis of the spool 21 with which it is associated. Thereby a bi-directional
brushing effect is obtained.
[0036] According to an embodiment, the scraping member 15 can be moved in rotation and in
contact with (the inlet surface 19 of) the filter wall 9, in particular, in rotation
in the same direction of rotation of the spool 21 to which it is associated. Thereby
the relative brushing speed between the scraping element 15 and the filter wall 9
increases.
[0037] According to one embodiment, the spray nozzles 12 are connected to a water supply
system 31 which supplies mains water and/or washing water from a suitable water tank
32 and/or water condensed from the drying air flow 6.
[0038] According to one embodiment, the spray nozzles 12 are positioned in an upper part
of the fluff trap 8 and spray from the top downwards against (the inlet surface 19
of) the filter wall 9.
[0039] The spray nozzles 12 direct pressurized water jets onto the (inlet surface 19 of)
the filter wall 9, preferably at an impact angle 39 lower than 60°, preferably lower
than 45° with respect to the plane of the filter wall 9 at the point of impact of
the water jet.
[0040] Advantageously, the area in which the pressurized water jets impact on the filter
wall 9 is arranged in an area in which the filter wall is free from supports, preferably
in an area between two spools 21, 21', 21".
[0041] With a further advantage, the spray nozzles 12 direct the water jets substantially
in the movement direction of the filter wall 9 and/or downwards. This facilitates
the collection of water sprayed together with the fluff detached from the filter wall
9 in a lower area of the fluff trap 1.
[0042] The spray nozzles 12 can be stationary or can be actuated in movement, e.g., they
can perform:
- an alternating movement of the nozzle itself in a direction transverse with respect
to the movement direction of the filter wall 9, or
- an alternating rotary movement of the nozzle which generates an alternating movement
of the water jet transverse with respect to the movement direction of the filter wall
9.
[0043] For the movement of the spray nozzles 12 a nozzle movement device 40 can be provided,
for example, a fluid-dynamic device actuated by the pressure of the water supplied
to the spray nozzles 12, or an electric motor, or a transmission which couples and/or
synchronizes the movement of the spray nozzles 12 with the movement of the filter
wall 9.
[0044] The filter cleaning system 11 further comprises a fluff transport system 33 with
a fluff collection container 34, arranged below the scraping member 15 and adapted
to collect the water sprayed by the spray nozzles 12 and the fluff separated from
the filter wall 9, as well as with a transport duct 35, possibly equipped with a transport
pump 36, which connects the fluff collection container 34 to a collection tray 37
which can be extracted and emptied by the user.
[0045] According to a further aspect of the invention, the laundry dryer 1 comprises an
electronic control system 38, which can be programmed by the user to select or set
one of a plurality of drying cycles, respectively, and configured to automatically
activate the filter cleaning system 11, for example, according to the execution of
the drying cycles, for example, after each drying cycle or after a predetermined number
of hours of operation of the laundry dryer 1.
[0046] During the normal operation of the laundry dryer 1, the filter wall 9 remains stationary
in a position, facing the flow of drying air 6, so as to trap the fluff on the surface
19 facing the air flow.
[0047] The fluff removal cycle 14, which will be defined within the drying cycle in terms
of frequency and duration, consists of a first washing action of the filter wall 9
with the use of water applied by means of the spray nozzles 12 from the top downwards.
In conjunction with this operation, a step is added of mechanical removal of the fluff
14 from the filter wall 9, by means of the scraping member 15 (preferably a stationary
brush) positioned at a lower area of the filter wall 9 and which collects the fluff
14 remaining on the filter wall 9 which, sliding downwards, conveys such fluff 14
against the scraping member 15.
[0048] The fluff that is detached and collected at the scraping member 15 is deposited in
the collection container 34 in the lower part of the filtering device 8 and evacuated
by means of and together with the water dispensed by the spray nozzles 12.
[0049] The invention described so far can be advantageously implemented in laundry dryers
with a closed air circuit, with an electrical resistor or with a heat pump.
[0050] In the embodiment with a closed drying circuit 5 and with an electrical resistor,
the drying air 6 is conveyed by means of a ventilator 41 (activated by a motor 42),
is heated by means of an electrical resistor 43 and is routed into the laundry compartment
3, in particular a rotatable basket or drum, where, by passing through the wet laundry,
causes the evaporation of the water contained in the fabrics. After exiting the laundry
compartment 3, the drying air 6 loaded with moisture passes through the heat exchanger
7, where it is cooled down, for example by means of a flow of cold water or of fresh
air 44 conveyed by means of a second ventilator (preferably, but not necessarily,
activated by means of the same electric motor 42), in order to extract the moisture
therefrom by means of condensation. The condensation is collected in a condensation
container which can be extracted, or drained by means of a drain pump and/or together
with the cooling water. The dehumidified drying air 6 is then sucked in again by the
ventilator 41, heated by means of the electrical resistor 43 and rerouted into the
laundry compartment 3.
[0051] Upstream of the heat exchanger 7 (where the moisture extraction occurs) the fluff
trap 8, with the cleaning system 11 described above, is arranged.
[0052] In the embodiment with a closed drying circuit 5 and with a heat pump, after exiting
the laundry compartment 3, the drying air 6 loaded with moisture passes through a
first (cold) heat exchanger 45 embodied by an evaporator 46 of the heat pump, where
the air 6 is cooled down in order to extract the moisture therefrom by means of condensation.
Also in this case, the condensation may be collected in a condensation container which
can be extracted, or may be drained, e.g., by means of a drain pump. The dehumidified
and cooled drying air 6 is then routed into a second (hot) heat exchanger consisting
of a condenser 47 of the heat pump, where the air is heated up. The dehumidified and
heated air is sucked in by means of a ventilator 41, and routed again into the laundry
compartment 3 in order to continue the extraction of the moisture from the laundry.
[0053] The heat pump further comprises a compressor 48 which sucks in a refrigerant fluid
through the evaporator 46, where the fluid itself evaporates at low pressure (absorbing
the heat of the drying air 6), compresses the refrigerant fluid and pushes it inside
the condenser 47 where the compressed and heated refrigerant fluid condenses and cools
down at high pressure (releasing its heat to the drying air 6). After the condenser
47, the refrigerant fluid passes through a thermal expansion valve 49 which reduces
the fluid pressure, with a consequent lowering of the temperature and, subsequently,
enters again in the evaporator 46, restarting the cycle.
[0054] Even in the embodiment with the heat pump, upstream of the first heat exchanger 45
(evaporator 46) the aforesaid fluff trap 8 with the cleaning system 11 is arranged.
[0055] According to an embodiment, to allow the inspection, maintenance and, if necessary,
the replacement of the filter wall 9, the fluff trap 8, or only the filter wall 9,
may be assembled in the housing 2 in a manner extractable from the laundry dryer 1.
[0056] As it is known, the control system 38 is in signal connection with and controls the
electrical supply of the individual functional groups of the laundry dryer 1, as diagrammatically
shown in
Figures 1 and 2.
[0057] The control system 35 may further comprise an optical indicator, e.g., a LED, display,
etc. or an acoustic indicator to signal to the user the need to extract the fluff
collected in the collection tray 37.
1. A laundry dryer (1) comprising a housing (2) which houses:
- a laundry compartment (3),
- an air circuit (5) which includes the laundry compartment (3) and a heat exchanger
(7) for extracting moisture from the drying air (6),
- a fluff trap (8) with a sieve-filter wall (9), positioned in the air circuit (5)
downstream of the laundry compartment (3) and upstream of the heat exchanger (7),
wherein the fluff trap (8) comprises a filter support structure (10), said sieve-filter
wall (9) supported by the filter support structure (10) and a filter cleaning system
(11),
wherein the filter cleaning system (11) comprises:
- one or more spray nozzles (12) supported by the filter support structure (10) and
configured to spray one or more pressurized water jets (13) on the filter wall (9)
to soak and detach fluff (14) from the filter wall (9), and
- a scraping member (15) supported by the filter support structure (10) in a scraping
abutment against the filter wall (9),
- a filter movement device (16) configured to move the filter wall (9) with respect
to the filter support structure (10) and with respect to the scraping member (15)
so that the scraping member (15) brushes the soaked fluff (14) away from the filter
wall (9).
2. A laundry dryer (1) according to claim 1, wherein the movement device (16) comprises
one or more spools (21) which can be actuated in rotation by means of one or more
electric motors (22) and the filter wall (9) is supported by said one or more spools
(21), so that the rotary actuation of the one or more spools (21) moves the filter
wall (9) in brushing contact against the scraping member (15).
3. A laundry dryer (1) according to claim 2, wherein the movement device (16) comprises
two spools (21) spaced apart from each other and the filter wall (9) is supported
by said two spools (21), so that:
- the rotary actuation of the two spools (21) in a first rotational direction (23)
unwinds the filter wall (9) from a first spool (21') of the two spools (21', 21")
and winds the filter wall (9) on a second spool (21") of the two spools (21', 21"),
keeping a portion of the filter wall (9) extending between the first spool (21') and
the second spool (21") and keeping the filter wall (9) always in brushing contact
against the scraping member (15),
- the rotary actuation of the two spools (21) in a second rotational direction (24)
unwinds the filter wall (9) from the second spool (21") of the two spools (21', 21")
and winds the filter wall (9) on the first spool (21') of the two spools (21', 21"),
keeping a portion of the filter wall (9) extending between the first spool (21') and
the second spool (21"),
wherein, the first spool (21') is arranged vertically above the second spool (21'),
so as to keep the filter wall (9) pull-tensioned in a vertical filtering plane (25)
between said first (21') and second (21") spools.
4. A laundry dryer (1) according to claim 2 or 3, wherein the electric motor (22) is
coupled to a synchronization or differential transmission (26) which transmits the
motion to the spools (21, 21', 21').
5. A laundry dryer (1) according to one of claims 2 to 4, wherein the filter wall (9)
is supported and pull-tensioned by the one or more spools (21, 21', 21") so as to
be extending along an extension path (27) between movement end paths (28), wherein
during the movement of the filter wall (9) in contact against the scraping member
(15), the extension path (27) remains substantially unchanged and at least one of
the end paths (28) undergoes a variation of the winding length.
6. A laundry dryer (1) according to one of the preceding claims, wherein the scraping
member (15) comprises one or more scrapers or brushes in contact with the filter wall
(9) and:
A) said one or more scrapers or brushes are:
- stationary, or
- movable by means of an own scraper actuator (29), or
- movable by means of the same actuator (22) of the filter movement device (16),
B) the fluff trap (8) forms a reaction surface (30) arranged at the scraping member
(15), but on the side of the filter wall (9) opposite with respect to the side on
which the scraping member (15) acts, so as to form an abutment for the thrust of the
scraping member against the filter wall (9).
7. A laundry dryer (1) according to claim 6 and 2, wherein the reaction surface (30)
is formed by one of the spools (21) or by a portion of filter wall (9) wound on said
spool (21).
8. A laundry dryer (1) according to claim 3, wherein the scraping member (15) is kept
in contact against the filter wall (9) at the second lower spool (21").
9. A laundry dryer (1) according to claim 8, wherein the scraping member (15) is positioned
below the second spool (21") and in contact from below against the filter wall (9),
with the laundry washing machine (1) in the position of use.
10. A laundry dryer (1) according to any one of the preceding claims, as dependent on
claim 2, wherein the scraping member (15) comprises a linear brush extending parallel
to the rotation axis of the spool (21) with which it is associated.
11. A laundry dryer (1) according to any one of the preceding claims, wherein the scraping
member (15) is movable:
- in a direction transverse with respect to the movement direction of the filter wall
(9), or
- in rotation and in contact with the filter wall (9).
12. A laundry dryer (1) according to any one of the preceding claims, wherein:
A) the spray nozzles (12) are positioned in an upper part of the fluff trap (8) and
spray from the top downwards against the filter wall (9), and/or
B) the spray nozzles (12) direct water jets at an impact angle (39) lower than 45°
with respect to the plane of the filter wall (9) at the point of impact of the water
jet,
wherein the area in which the pressurized water jets impact on the filter wall (9)
is arranged in a region in which the filter wall (9) is free from supports, and/or
C) the spray nozzles (12) are stationary.
13. A laundry dryer (1) according to any one of claims 1 to 12, wherein the spray nozzles
(12) are moved during the water dispensing.
14. A laundry dryer (1) according to any one of the preceding claims, wherein the filter
cleaning system (11) comprises a fluff transport system (33) with:
- a fluff collection container (34) arranged below the scraping member (15) and adapted
to collect the water sprayed by the spray nozzles (12) and the fluff separated from
the filter wall (9),
- a transport duct (35) that connects the fluff collection container (34) to a collection
tray (37) which can be extracted and emptied by the user.
15. A fluff trap (8) for a laundry dryer (1), wherein the fluff trap (8) comprises a filter
support structure (10), a sieve-filter wall (9) supported by the filter support structure
(10) and a filter cleaning system (11),
wherein the filter cleaning system (11) comprises:
- one or more spray nozzles (12) supported by the filter support structure (10) and
configured to spray one or more pressurized water jets (13) on the filter wall (9)
to soak and detach fluff (14) from the filter wall (9), and
- a scraping member (15) supported by the filter support structure (10) in a scraping
position against the filter wall (9),
- a filter movement device (16) configured to move the filter wall (9) with respect
to the filter support structure (10) and with respect to the scraping member (15)
so that the scraping member (15) brushes the soaked fluff (14) away from the filter
wall (9).