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EP 1 984 553 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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20.11.2013 Bulletin 2013/47 |
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Date of filing: 29.01.2007 |
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International Patent Classification (IPC):
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International application number: |
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PCT/EP2007/000723 |
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International publication number: |
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WO 2007/093274 (23.08.2007 Gazette 2007/34) |
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DOMESTIC CLOTHES DRIER WITH TWIN FAN
HAUSHALTSWÄSCHETROCKNER MIT DOPPELGEBLÄSE
SECHE-LINGE DOMESTIQUE AVEC DOUBLE VENTILATEUR
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Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE
SI SK TR |
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Priority: |
15.02.2006 IT PN20060004 U
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Date of publication of application: |
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29.10.2008 Bulletin 2008/44 |
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Proprietor: Electrolux Home Products Corporation N.V. |
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1130 Brussel (BE) |
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Inventors: |
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- FAVRET, Ugo
I-33072 Casarsa (PN) (IT)
- NOVIELLO, Flavio
I-33081 Aviano (PN) (IT)
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Representative: Nardoni, Andrea et al |
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Electrolux Italia S.p.A.
Corso Lino Zanussi, 30 33080 Porcia (PN) 33080 Porcia (PN) (IT) |
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References cited: :
EP-A- 1 741 934 US-A- 5 476 365
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EP-A1- 1 475 474
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to an improved type of clothes drying machine, preferably
of the domestic kind, which operates in a particularly efficient manner.
[0002] In the continuation of the present description reference will be made to a simple
clothes drying machine, but it is understood that the above explanation may also be
applied in an identical manner to - and therefore is also valid for - a combined washing
and drying machine.
[0003] Clothes drying machines which operate using different methods are known, in particular
those operating by means of condensation of a flow of hot air which is blown into
the drum and which removes the moisture contained in the clothes or by discharging
externally said flow of moist hot air.
[0004] Said clothes drying machines are described generally in the European Patent
EP-A-1 475 474 in the name of the same applicant.
[0005] However, in order to assist the reader, a short descriptive part of said document
is included here.
[0006] As is well-known, these machines are made by installing a heating and ventilation
system, normally a ventilator consisting of a fan and associated electric motor, which
draws the air from the outside and by means of suitable ducts heats it and blows it
into the drum containing the clothes to be dried.
[0007] A heating element is installed inside said duct and, suitably activated, heats the
air which passes over it and is blown in by said ventilator, so that hot air is introduced
into the drum so as to cause evaporation of the moisture contained in the clothes.
[0008] After being introduced into the drum, the hot air causes evaporation of the moisture
contained in the clothes and therefore is practically saturated or completely saturated
with it; said air is then propelled by said ventilator, creating a continuous flow
which is directed into a suitable condensation device, usually consisting of a heat
exchanger which is passed through, along the so-called "hot" path, by said moist hot
air flow and, along the so-called "cold" path, by a substantially continuous flow
of air drawn from the environment and introduced back into the environment after passing
through said exchanger.
[0009] Conventionally, said air flow along the "cold" path is also activated and maintained
by a ventilator operated by a respective electric motor.
[0010] Said clothes drying machines are fairly simple, low-cost and operationally reliable
machines, but, as is well-known, they have the common drawback that they are significantly
noisy owing to the air flow which is blown in at a considerable rate inside the suction
and discharge ducts.
[0011] Consequently, the use of these machines is normally limited to certain periods, this
making their use less attractive for the average user.
[0012] The most immediate technical solution for achieving the circulation of said two separate
air flows is that of using respective ventilators inserted inside the corresponding
ducts and operated by respective motors which are controlled independently.
[0013] Obviously said two ventilators use a not insignificant amount of power, owing to,
not only mechanical friction factors which, however, are of limited importance, but
also and in particular the power which must be used in order to impart to the respective
air flows the desired speed, or pressure, at the necessary flowrate.
[0014] It would therefore be desirable, and this is the main object of the present invention,
to provide a clothes drying machine of the condensation or externally discharging
type, which is provided with fans for drying and if necessary cooling the condenser
and is able to offer a normal drying performance, but which is significantly more
efficient, without increasing the complexity of the machine, while keeping the production
costs low.
[0015] These and other objects which will be described further below are achieved by providing
a clothes drying machine according to the claims which follow; the invention will
be understood more clearly from the following description, provided solely by way
of a non-limiting example with reference to the accompanying drawings, in which:
- Fig. 1 shows a general schematic diagram of a clothes drying machine provided with
a condenser and two fans which are rigidly connected together, according to the prior
art;
- Figs. 2 and 3 show two perspective views, i.e. a front view and side view, respectively,
of a fan for circulating air in a machine according to the invention;
- Fig. 4 shows a front view of the said fan;
- Fig. 5 shows a cross-sectional view through the centre of the said fan;
- Fig. 6 shows a front view of a variant of embodiment of the fan according to the invention;
- Fig. 7 shows, in a same diagram, two separate graphs illustrating the progression
of the pressure and electric power consumption of the motor in a clothes drying machine
with a fan according to the prior art (graph A) and with a fan which is the same,
but equipped with the present invention (graph B), respectively.
[0016] With reference to Fig. 1, in a clothes drying machine according to a preferred embodiment
of the invention, a drum 1 is provided for containing the clothes to be dried and
has, associated with it, a duct 2 for circulation of the drying air; the latter also
passes through a condenser 3 which is able to condense the moisture present in the
air passing through it, said condenser being passed through by a "cold" air flow,
namely one which is drawn from the environment and conveyed to the said condenser
3 via an associated duct 4.
[0017] Both the ducts 2 and 4 contain inside them two respective fans 5, 6 for actuating
the respective drying and cooling air flows.
[0018] One of said fans, or both of them, consist of two sets of vanes which are arranged
on the outer surface of a respective cylindrical form, said two cylindrical forms
being understood in the non-material sense.
[0019] Said cylindrical forms are moreover coaxial and the radius of a first cylindrical
form is smaller than the radius of the second cylindrical form.
[0020] Essentially the two cylindrical forms, and therefore also the two sets of vanes,
are inserted inside one another, without touching however, as is clearly illustrated
in Figures 2 to 5.
[0021] The vanes 10, 11, 12 ... of the first set, or outer set, are rigidly supported by
a wall "P" arranged along a geometric base of the respective cylindrical form, and
the supporting structure of said fan is thus formed.
[0022] Advantageously the vanes of the set of inner vanes 20, 21, 22 ... of the second set
are likewise supported on said wall "P" such that the vanes of both sets are joined
together and can rotate in synchronism.
[0023] Still with reference to Figures 2, 3 and 4, in order to avoid damaging vortices on
the inner vanes, advantageously the latter have a shape which is not flat but curved,
i.e. with the associated concavities C1, C2, C3, etc., directed in the sense of rotation.
[0024] Moreover and preferably the free ends of the vanes of each set are connected by a
respective reinforcing ring 7, 8.
[0025] The fan according to the invention is thus formed.
[0026] The mode of operation of this fan will now be clear: in fact the air which is sucked
in by the cavity between the two sets of vanes is forced outside by the outer vanes
in accordance with known mechanical principles, while the air sucked inside the inner
vanes is naturally blown outwards, i.e. into said cavity, with a certain given speed
which is added to the speed imparted by the outer vanes through which it passes immediately
afterwards.
[0027] Basically operation similar to that of a twin-stage fan occurs, in which at least
part of the air sucked in is subject to the series action of the vanes of the two
sets.
[0028] Obviously the flow of said air blown from the inner vanes also assists the movement
of the air sucked directly from the outside into said cavity, this favouring the general
efficiency of the fan.
[0029] It may also be considered that the air blown out from the set of inner vanes is slightly
slowed down by the air sucked in directly from the outside into said cavity; however,
the overall effect is an improvement in the efficiency of the fan, as demonstrated
by Fig. 7, which shows two graphs illustrating the flowrate of a fan with and without
the invention, the graph A showing the pressure and the consumption of a fan without
the invention and the graph B showing the corresponding parameters of the same fan
to which the set of inner vanes according to the invention has been added.
[0030] With reference to Fig. 4, it has also been observed that in certain embodiments and
in certain operating conditions, for example when the fan must operate always in the
same direction of rotation, or, as more frequently occurs in a clothes drying machine,
in a main direction of rotation, the efficiency of the fan is further increased if
the inner vanes are provided with an orientation which is not radial, but inclined
at a given angle "i" with respect to the radial plane which passes through the latter,
and in particular if said inner vanes are inclined such that, taking as a reference
the direction of rotation "S" of the fan, the outer edges 45, 46, 47 of each inner
vane are situated further forwards than the respective inner edges 45A, 46A, 47A,
obviously relative to the planes p1, p2, p3 which pass through said respective vanes.
[0031] However, more generally it is possible to envisage fans which are operated in an
alternating manner and for identical periods in each direction of rotation; in this
case it is obviously advantageous if the vanes of the fan also do not have preferential
forms, but on the contrary, as shown by way of example in Fig. 6, all the inner vanes
are flat and arranged radially.
1. Clothes drying machine or combined clothes washing and drying machine comprising a
drum (1) containing the clothes to be dried, at least one first fan (5) able to blow
a first flow of drying air through said drum, a condenser (3) inside which said drying
air flow is made to pass and an associated cooling air duct (4) which conveys a second
flow of fresh air through said condenser (3), said second flow being actuated by a
second fan (6) associated with said air duct (4), wherein at least one of said fans
(5, 6) is formed by means of a first set of outer vanes (10, 11, 12) and a second
set of inner vanes (21, 22, 23) rotating with respect to a common axis (X), wherein
the vanes of the first set of vanes are distributed on a first cylindrical form, and
wherein the vanes of the second set of vanes are arranged along a second cylindrical
form which is different from the first cylindrical form and are arranged inside said
first cylindrical form, characterized in that a base of the cylinder which is defined by the first set of vanes is at least partly
closed by a wall (P).
2. Machine according to Claim 1, characterized in that the vanes of the second set of vanes arranged internally are fixed at one of their
ends to said wall (P).
3. Machine according to any one of the preceding claims, characterized in that said vanes of said first set are radial with respect to said common axis (X).
4. Machine according to Claim 3, characterized in that said vanes of the second set of inner vanes (20, 21, 22) are oriented in a non-radial
direction with respect to said common axis and have a given inclination (i) with respect
to the respective radial planes passing through them.
5. Machine according to Claim 4, characterized in that said given inclination is such that the outer edges (45, 46, 47) of respective inner
vanes are situated further forwards in the direction of fan rotation than the respective
inner edges (45A, 46A, 47A).
6. Machine according to any one of the preceding claims, characterized in that said inner vanes have a concave surface (Cl, C2, C3) directed in the sense of rotation
of said fan.
1. Wäschetrocknermaschine oder kombinierte Wäschewaschund Trocknermaschine, umfassend
eine Trommel (1), welche die zu trocknende Wäsche aufnimmt, mindestens ein erstes
Gebläse (5), das geeignet ist, einen ersten Trocknerluftstrom durch die Trommel zu
blasen, einen Kondensator (3), innerhalb dessen der Trocknerluftstrom durchgeführt
wird, und eine zugehörige Kühlluftleitung (4), die einen zweiten Frischluftstrom durch
den Kondensator (3) befördert, wobei der zweite Strom von einem zweiten Gebläse (6)
in Verbindung mit der Luftleitung (4) ausgelöst wird, wobei mindestens eines der Gebläse
(5, 6) mittels einer ersten Gruppe äußerer Flügel (10, 11, 12) und einer zweiten Gruppe
innerer Flügel (21, 22, 23) gebildet wird, die mit Bezug auf eine gemeinsame Achse
(X) rotieren, wobei die Flügel der ersten Gruppe von Flügeln auf einer ersten zylindrischen
Form verteilt sind und wobei die Flügel der zweiten Gruppe von Flügeln entlang einer
zweiten zylindrischen Form angeordnet sind, die sich von der ersten zylindrischen
Form unterscheidet, und innerhalb der ersten zylindrischen Form angeordnet sind, dadurch gekennzeichnet, dass eine Basis des Zylinders, die durch die erste Gruppe von Flügeln begrenzt wird, wenigstens
teilweise durch eine Wand (P) abgeschlossen ist.
2. Maschine gemäß Anspruch 1, dadurch gekennzeichnet, dass die Flügel der zweiten Gruppe von Flügeln, die innen angeordnet sind, an einem ihrer
Enden an der Wand (P) befestigt sind.
3. Maschine gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Flügel der ersten Gruppe radial mit Bezug auf die gemeinsame Achse (X) sind.
4. Maschine gemäß Anspruch 3, dadurch gekennzeichnet, dass die Flügel der zweiten Gruppe innerer Flügel (20, 21, 22) in eine nicht-radiale Richtung
mit Bezug auf die gemeinsame Achse ausgerichtet sind und eine gegebene Neigung (i)
mit Bezug auf die entsprechenden radialen Ebenen aufweisen, die durch sie hindurch
gehen.
5. Maschine gemäß Anspruch 4, dadurch gekennzeichnet, dass die gegebene Neigung so angelegt ist, dass die Außenkanten (45, 46, 47) der entsprechenden
inneren Flügel weiter vorne in Richtung der Gebläserotation als die entsprechenden
Innenkanten (45A, 46A, 47A) angeordnet sind.
6. Maschine gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die inneren Flügel eine konkave Oberfläche (C1, C2, C3) aufweisen, die in Rotationsrichtung
des Gebläses ausgerichtet ist.
1. Machine sèche-linge ou machine lave-linge et sèche-linge combinée comprenant un tambour
(1) contenant le linge à sécher, au moins un premier ventilateur (5) capable de souffler
un premier flux d'air de séchage à travers ledit tambour, un condenseur (3) à l'intérieur
duquel ledit flux d'air de séchage est amené à passer et une conduite d'air de refroidissement
associée (4) qui achemine un second flux d'air frais à travers ledit condenseur (3),
ledit second flux étant actionné par un second ventilateur (6) associé à ladite conduite
d'air (4), où au moins l'un desdits ventilateurs (5, 6) est formé au moyen d'un premier
ensemble de palettes externes (10, 11, 12) et d'un second ensemble de palettes internes
(21, 22, 23) tournant par rapport à un axe commun (X), où les palettes du premier
ensemble de palettes sont distribuées sur une première forme cylindrique, et où les
palettes du second ensemble de palettes sont agencées le long d'une seconde forme
cylindrique qui est différente de la première forme cylindrique et sont agencées à
l'intérieur de ladite première forme cylindrique, caractérisée en ce qu'une base du cylindre qui est définie par le premier ensemble de palettes est au moins
partiellement fermée par une paroi (P).
2. Machine selon la revendication 1, caractérisée en ce que les palettes du second ensemble de palettes agencées de façon interne sont fixées
au niveau de l'une de leurs extrémités à ladite paroi (P).
3. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que lesdites vannes du premier ensemble sont radiales par rapport audit axe commun (X).
4. Machine selon la revendication 3, caractérisée en ce que lesdites palettes du second ensemble de palettes internes (20, 21, 22) sont orientées
dans une direction non radiale par rapport audit axe commun et ont une inclinaison
donnée (i) par rapport aux plans radiaux respectifs passant à travers ces dernières.
5. Machine selon la revendication 4, caractérisée en ce que ladite inclinaison donnée est telle que les bords externes (45, 46, 47) de palettes
internes respectives sont situés plus vers l'avant dans le sens de rotation du ventilateur
que les bords internes respectifs (45A, 46A, 47A).
6. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que lesdites palettes internes ont une surface concave (Cl, C2, C3) dirigée dans le sens
de rotation dudit ventilateur.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description