[0001] The present invention refers to a combined automatic machine adapted to wash and/or
dry clothes.
[0002] Such combined machines, which are generally known under the term of washer-driers
in the art, are largely known to mainly comprise a tub adapted to contain, usually
inside a rotating drum, clothes that can be washed, rinsed, spin-extracted and/or
dried thanks to the provision of appropriate water-handling circuits, as well as a
drying circuit by means of which heated air that becomes progressively laden with
the moisture subtracted from the clothes contained in the tub is caused to circulate
through or in correspondence of condenser means for the condensation of said moisture.
[0003] In particular, the above cited water-handling circuits comprise a container of washing
and/or rinsing products, which may for instance be in the form of a pull-out drawer,
or the like, and is arranged so as to be able to be supplied from one or more nozzles
with water adapted to flush off said washing and/or rinsing products and convey them
into the tub through a siphon arrangement.
[0004] Residual water collects on the bottom of said siphon so as to cut off the communication
existing between the tub and said washing product container, thereby preventing, for
instance during the clothes drying phase, the moisture-laden hot air that is present
in the tub from leaking into the outside ambient through the same product container.
[0005] On the other hand, during the operation of the machine it may quite easily occur
that the level of the residual water in the siphon decreases to such an extent as
to cause the siphon itself to practically become ineffective against the above cited
undesired leakage of moisture-laden hot air, with the various problems and drawbacks
that this may imply, as all those skilled in the art are well aware of.
[0006] Such an undesired occurrence of the siphon emptying out may for instance be brought
about by water losses caused by the oscillations of the machine during a spin-extraction
phase of the clothes washing cycle and/or by the evaporation of the residual water
contained in the siphon owing to the heating which the same water is exposed to during
certain operation phases of the machine, in particular during the clothes drying process.
[0007] It therefore is a purpose of the present invention to provide a combined clothes
washing and drying machine, in which, even in the presence of critical operating conditions
and without any need for substantial structural modifications, the possibility for
moisture-laden air to be undesirably vented from the tub into the outside ambient,
in particular through the washing and rinsing product container, is completely eliminated.
[0008] According to the present invention, these and further aims are reached in a combined
clothes washing and drying machine having the characteristics as recited in the appended
claims.
[0009] Anyway, features and advantages of the present invention will be more readily understood
from the description that is given below by way of non-limiting example with reference
to the single accompanying drawing, which is a schematical view of the main operating
component parts of the machine according to a preferred embodiment thereof.
[0010] With reference to the above mentioned Figure, the combined clothes washing and drying
machine mainly comprises, duly arranged within an outer casing (not shown), a washing
tub 1 housing a clothes-containing drum 2 that is adapted to rotate at different revolution
speeds to carry out a sequence of washing, rinsing, spin-extracting, drying and similar
phases of an operating cycle of the machine.
[0011] The machine further comprises a container 3 for holding and dispensing washing and/or
rinsing products and aids, which may for instance of the pull-out drawer-like type
comprising a plurality of differentiated compartments (not shown for reasons of greater
simplicity).
[0012] In a per sè known manner, the container 3 is capable of being selectively supplied
with the water flowing in from the mains 4 via pipes 5 and 6 that are provided with
respective controlled electromagnetic valves 7, 8, or the like.
[0013] For instance, the pipe 5 is adapted to deliver washing water that flushes off and
conveys into the tub 1 a corresponding washing product filled in an appropriate compartment
of the container 3, whereas the pipe 6 is adapted to supply rinsing water that flushes
off and conveys into the tub 1 a corresponding rinsing aid, such as a fabric softener,
filled in another compartment of the same container.
[0014] In any case, the water from the mains that is in this way supplied to the container
3 flows into the tub 1 via a conduit 9, which has at least a siphon-shaped portion
10, in which residual water 11 is able to collect so as to normally form a hydraulic
hindrance which prevents the moisture-laden air that is present in the tub 1 during
certain operating phases (in particular during the traditional clothes drying phase)
from leaking into the outside ambient through the conduit 9 and the container 3.
[0015] For carrying out the above mentioned clothes drying process, the machine is preferably
provided with a condenser 12, towards which the moisture released by the clothes contained
in the tub 1 is actually conveyed through a per sè known (and not shown) forced-flow
hot-air circuit.
[0016] In this way, the moisture is capable of condensing on said condenser 12, which to
this purpose is adapted to be cooled with water flowing in from the mains 4 via a
pipe 13 provided with a controlled-type electromagnetic valve 14 or similar device.
[0017] The machine of course comprises a programme sequence control unit, of a per se known
type and, therefore, not shown, which is adapted to control the various operating
component parts thereof.
[0018] According to a feature of the present invention, such a programme sequence control
unit is set in such a manner as to enable, preferably just before the beginning of
the afore mentioned clothes drying phase, at least one of the electromagnetic valves
7, 8 to be temporarily opened so as to let into the siphon 10, via the corresponding
pipe 5, 6 and the container 3, a calibrated amount of water ensuring the substantial
filling up of the same siphon even in the case that the latter would have at least
partially emptied owing to the oscillations of the machine generated during a preceding
spin-extraction phase of the rotating drum 2.
[0019] In alternative thereto, or even in addition thereto, at least one of the electromagnetic
valves 7, 8 is opened temporarily during the clothes drying phase to let into the
siphon 10, via the corresponding pipe 5, 6 and the container 3, a calibrated amount
of water ensuring the substantial filling up of the same siphon even in the case that
the latter would have at least partially emptied owing to thermal evaporation of the
residual water 11.
[0020] In an embodiment of the present invention, said temporary opening of the electromagnetic
valves 7 and/or 8 can be caused to occur repeatedly during the clothes drying phase,
eg. periodically every 20 minutes.
[0021] By way of example, if the electromagnetic valves 7, 8 have a flow rate of 8 litres/minute,
each one of the above mentioned temporary openings may have a duration of approx.
0.5 seconds, which practically implies a substantially negligible water usage.
[0022] In any case, any possible excess amount of water that is in this manner let into
the siphon 10 is conveyed into the tub 1 via the conduit 9, anyway in such small amounts
and at such reduced flow rates as to exclude any possibility for the clothes in the
tub to be really wetted by it.
[0023] Furthermore, the above mentioned temporary water inflows occur when no products or
aids are present in the container 3 and this advantageously prevents any scaling problem
from showing up in the water supply and carrying circuit 3-10.
[0024] Conclusively, the machine according to the present invention, which may be of a fully
traditional type and only requires a simple and particular setting of the programme
sequence control unit thereof, ensures that the clothes drying phase can effectively
be performed without any possibility for the moisture-laden hot air that is present
in the tub 1 to leak into the outside ambient by flowing back through the conduit
9 and the container 3.
1. Combined clothes washing and drying machine adapted to perform a sequence of process
phases for washing, rinsing, spin-extracting and drying the clothes contained in a
tub (1) adapted to be supplied from the mains through a water supply and handling
circuit comprising at least a pipe (5; 6) provided with controlled valve means (7;
8), a washing and rinsing product container (3) and a conduit (9) provided with at
least a siphon arrangement (10) adapted to normally fill up with residual water, characterized in that at least one of said valve means (7; 8) is adapted to be opened temporarily, before
and/or during said clothes drying phase, in order to let into the siphon arrangement
(10) a calibrated amount of water, so as to ensure that said siphon (10) is substantially
filled up to prevent moist air from leaking outside through said washing product container
(3).
2. Combined clothes washing and drying machine according to claim 1, characterized in that said valve means (7; 8) are adapted to be temporarily opened in a repeated manner
during said clothes drying phase.
3. Combined clothes washing and drying machine according to claim 2, characterized in that during said clothes drying phase said valve means (7; 8) are adapted to be temporarily
opened at periodical intervals.