EP1475474A1 - Wäschetrockner mit verbesserter Lüfteranordnung - Google Patents

Wäschetrockner mit verbesserter Lüfteranordnung Download PDF

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Publication number
EP1475474A1
EP1475474A1 EP04009650A EP04009650A EP1475474A1 EP 1475474 A1 EP1475474 A1 EP 1475474A1 EP 04009650 A EP04009650 A EP 04009650A EP 04009650 A EP04009650 A EP 04009650A EP 1475474 A1 EP1475474 A1 EP 1475474A1
Authority
EP
European Patent Office
Prior art keywords
fan
air
flow
drying
vanes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04009650A
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English (en)
French (fr)
Other versions
EP1475474B1 (de
Inventor
Ugo Favret
Silvano Cimetta
Flavio Noviello
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to SI200430320T priority Critical patent/SI1475474T1/sl
Publication of EP1475474A1 publication Critical patent/EP1475474A1/de
Application granted granted Critical
Publication of EP1475474B1 publication Critical patent/EP1475474B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type

Definitions

  • the present invention refers to an improved kind of clothes drying machine, preferably of the type for use in households, which is particularly quiet, i.e. low-noise in operation.
  • Clothes drying machines are largely known in the art to generally operate according to different principles and modes, including the condenser mode, i.e. the operation based on the condensation of the moisture contained in a stream of drying air that is first blown through the drum, where it removes moisture from the clothes contained therein, and flows eventually out of the same drum and into the condenser, and the exhaust mode, in which said flow of moisture-laden hot air is exhausted as such outside the machine.
  • the condenser mode i.e. the operation based on the condensation of the moisture contained in a stream of drying air that is first blown through the drum, where it removes moisture from the clothes contained therein, and flows eventually out of the same drum and into the condenser
  • the exhaust mode in which said flow of moisture-laden hot air is exhausted as such outside the machine.
  • a ventilation system i.e. usually a blower formed by a fan and an electric motor associated thereto, and a heating arrangement, which draw air from the outside and, via an appropriate conduit arrangement, heat up such air and blow it into and through the drum holding the clothes to be dried.
  • a heating element which, when appropriately energized, heats up the air that flows over it as blown by said blower, so that air is let into the drum which is sufficiently hot to cause the moisture contained in the clothes to evaporate.
  • the hot air causes the moisture contained in the clothes to evaporate and becomes almost saturated, or even fully saturated, with this evaporated moisture.
  • the resulting hot, moisture-laden air is then forced further by said blower to create a continuous flow that is conveyed into and through an appropriate condensation arrangement, which is usually formed by a heat-exchanger that is flown through - along the so-called "hot path” - by said stream of hot moisture-laden air and - along the so-called “cold path” - by a substantially continuous stream of air taken in from the surrounding ambient and exhausted again into the same surrounding ambient upon having so flown across said heat exchanger.
  • said single drive motor is controlled to alternately rotate in the two opposite directions of rotation, in which there are defined a main direction of rotation, wherein the vanes or blades are arranged so as to provide a maximum of flow rate and ventilation efficiency, and an opposite direction of rotation, which is also referred to as the reverse direction of rotation.
  • the noise generated by the fan in the cooling air conduit during the main operating mode is rather high, amounting for instance to about 67 dB, while however sustaining a flow rate of approx. 200 m 3 /hr, whereas the same noise lowers, for instance down to approx. 63 dB, during the reverse operating mode, when a lower flow rate of approx. 80 m 3 /hr is anyway sustained (the above-noted values are merely indicative).
  • the different noise generation pattern of the two kinds of vanes is best illustrated by the two graphs appearing in the attached Figures 1 and 2, in which the first graph shows the noise generation pattern of the vanes according to the prior art, whereas the second graph illustrates the corresponding noise generation pattern of the above-mentioned "inverted" vanes.
  • Figure 3 shows a graph illustrating both the flow rate P of condensed moisture and the temperature T of the air leaving the drum versus the time elapsed from the beginning of the drying process.
  • a drum 1 adapted to hold the clothes to be dried, to which there is associated a conduit 2 for the drying air to be circulated therethrough; this conduit extends to also pass through a condenser arrangement 3 that is adapted to condense the moisture contained in the air circulating therethrough, said condenser being flown through by a stream of "cold" air, i.e. air that is taken in from the surrounding ambient and sent to said condenser 3 via a corresponding conduit 4.
  • a stream of "cold" air i.e. air that is taken in from the surrounding ambient and sent to said condenser 3 via a corresponding conduit 4.
  • Both conduits 2 and 4 contain respective fans 5 and 6 thereinside to bring about the respective streams of drying and cooling air; furthermore, the shafts of said two fans 5 and 6 are connected in a generally known manner, even via appropriate kinematical links, to a single drive motor 7, so that the rotation of this motor will cause said to fans to correspondingly rotate in a synchronous manner, wherein said motor 7 is controlled by suitable control means (not shown) that are adapted to cause it to selectively rotate in the two possible directions of rotation, and this obviously enables said two fans to be in turn caused to rotate in a selective, but anyway mutually consistent manner (wherein by "mutually consistent” is meant that, when a first fan rotates in a definite direction, the second fan unchangingly rotates in a single and same direction of its own; and when the direction of rotation of said first fan is reversed, the second fan will change its own direction of rotation, too).
  • Said cooling air fan is usually enclosed in a casing generally known as "scroll", whose shape is such as to enable the air being blown by said fan to be effectively used and directed into the conduit leading to the condenser under as small as possible an efficiency loss.
  • the motor driving the fan can also be used, via suitable motion transmission means, to rotatably drive also the clothes-holding drum and it is actually a common practice, in this connection, to let this motor be operated for short periods of time in the normal, or main, direction of rotation, said periods being alternated with other short periods of time, in which it rotates in the reverse, or secondary, direction.
  • the condenser cooling fan is usually of the so-called "tangential" type, i.e. it is made in the shape of a hollow geometrical cylinder , in which the side cylindrical surface is traversed by a multiplicity of vanes 9, which are variously curved, i.e. concave or convex, with respect to the tangent being projected in the direction of rotation; as already stated hereinbefore, the simple curvature of the vanes brings about an excessive noise generation, which is however modified when switching over from the main mode of operation to the reverse or secondary one, thereby creating the possibility of reducing the average amplitude of the noise through a shorter duration of the period of reverse operation.
  • the period of reverse operation is shortened, at a level of noise of 70 dB, and all other conditions remaining unaltered the average amplitude of the same noise is certainly reduced.
  • the fan 6, has been provided, further to said first vanes 9 arranged radially with respect to the axis of the cylinder that is substantially defined by them, with an additional plurality of second vanes 10, wherein these are arranged between said axis X of said hollow geometrical cylinder and the related outside cylindrical surface or, more precisely, between the intersection point 0 of said axis X with one of the two bases of said cylinder, and that portion 11 of the outside surface of said geometrical cylinder which lies adjacent to said base, indicated symbolically at 12, as this is most clearly illustrated in Figures 5 to 10.
  • Said second vanes 10 are themselves arranged radially, in the sense that they project in a fan-like wise from said central point 0, from which they diverge.
  • said second vanes 10 are represented in the form of curved surfaces (they are fluted surfaces, i.e. a particular case of curved surfaces), whose front or rear projection, however, looks as a corresponding plurality of similar triangles having a vertex at said point 0, as exemplified in Figures 7 and 8.
  • said vanes are represented in the form of curved triangular surfaces that are substantially inclined with respect to the plane containing said base 12.
  • said second vanes 10 may take other forms, e.g. they may be petal-shaped or be given the shape of screw blades, wherein they must in all cases feature an overall geometrical configuration such that, when the fan 9 rotates in a given direction, said second vanes will taken in air axially from the outside ambient, through the section of the cylinder that is indicated symbolically at 13 and lies on the opposite side with respect to said base 12; in other words, in this direction of rotation said second vanes take in the outside air axially and cause it to flow into the geometrical cylinder, so that this air will eventually be more easily taken in and pushed by said first vanes 9 tangentially thereto.
  • said second fan is used as the cooling air fan 6 and is mounted so that, during the secondary operating mode, it generates not only the least air flow, but also the least noise, and if the duration of said secondary operation periods is at the same time shortened, then the targeted aim is fully reached, since no need actually arises for the condenser to be cooled down during the initial phases of the drying process, when condensation is in fact still limited owing to the drying air temperature not having reached any adequately high value yet, whereas the slight loss in condensation efficiency incurred as the drying process progresses can be readily compensated for by said shortened duration of the secondary operation periods, so that the overall ultimate result is not affected at all.
  • the cooling air fan is allowed to alternately rotate in the two opposite directions of rotation, according to programme sequences that are already known as such in the art and designed so as to enable an effective condensation process to take place during the main operating mode of the cooling air fan, whereas the secondary operating mode thereof is selected so as to be as short as possible and is anyway allowed to be carried out to the sole purpose of disentangling clothes that may in the meantime have rolled up into a ball.
  • Figure 11 shows two distinct graphs indicating the temperature pattern of the drying air with a cooling fan of a prior-art kind alternately rotating in both directions, i.e. operating alternately in both its main and secondary modes since the beginning (curve A), and with a cooling fan according to the present invention rotating only in its secondary direction of rotation, i.e. operating in its sole secondary operating mode during the initial phase of the drying process (curve B), respectively.
  • the function itself of the cooling air fan shall therefore be capable of being controlled selectively both through appropriate commands that may be imparted via external control means and on the basis of other parameters, such as for instance time, temperature or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)
EP04009650A 2003-05-09 2004-04-23 Wäschetrockner mit verbesserter Lüfteranordnung Expired - Lifetime EP1475474B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200430320T SI1475474T1 (sl) 2003-05-09 2004-04-23 Gospodinjski stroj za sušenje perila z izboljšano razmestitvijo ventilatorjev

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN20030015 2003-02-26
IT000015U ITPN20030015U1 (it) 2003-05-09 2003-05-09 Asciugabiancheria domestica con ventola perfezionata.

Publications (2)

Publication Number Publication Date
EP1475474A1 true EP1475474A1 (de) 2004-11-10
EP1475474B1 EP1475474B1 (de) 2007-03-07

Family

ID=33017989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04009650A Expired - Lifetime EP1475474B1 (de) 2003-05-09 2004-04-23 Wäschetrockner mit verbesserter Lüfteranordnung

Country Status (6)

Country Link
EP (1) EP1475474B1 (de)
AT (1) ATE356244T1 (de)
DE (1) DE602004005098T2 (de)
ES (1) ES2283895T3 (de)
IT (1) ITPN20030015U1 (de)
SI (1) SI1475474T1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1666657A1 (de) 2004-12-01 2006-06-07 Electrolux Home Products Corporation N.V. Geräuscharmer Haushaltstrockner
EP1700944A1 (de) 2005-03-08 2006-09-13 Electrolux Home Products Corporation N.V. Haushaltswäschetrockner mit Wäsche-Desinfizierungszyklus
WO2007093274A1 (en) * 2006-02-15 2007-08-23 Electrolux Home Products Corporation N.V. Domestic clothes drier with twin fan
EP1959048A1 (de) * 2007-02-15 2008-08-20 Electrolux Home Products Corporation N.V. Wäschetrockner mit verbesserter Dampfinjektionsanordnung
CN103225625A (zh) * 2013-03-28 2013-07-31 无锡小天鹅股份有限公司 离心风扇和具有其的干衣机
WO2014153748A1 (zh) * 2013-03-28 2014-10-02 无锡小天鹅股份有限公司 离心风扇和具有其的干衣机
US20160161133A1 (en) * 2014-12-08 2016-06-09 Tornado Systems Co., Ltd. Ventilation module with swirler fan
CN109209993A (zh) * 2018-11-09 2019-01-15 嵊州市天骏电器有限公司 一种用于集成灶具的风轮及其制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110965298B (zh) * 2018-09-27 2022-07-08 合肥美的洗衣机有限公司 衣物处理设备的控制方法
CN110965297B (zh) * 2018-09-27 2022-07-08 合肥美的洗衣机有限公司 衣物处理设备的控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135289A1 (de) * 1981-09-05 1983-03-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt "waeschetrockner"
GB2219849A (en) * 1988-06-17 1989-12-20 Zanussi A Spa Industrie Noise reduced tumble dryer
EP0434169A2 (de) * 1989-12-22 1991-06-26 OCEAN S.p.A. Herstellungsverfahren und verbesserter Trommeltrockner
DE3942083A1 (de) * 1989-12-20 1991-06-27 Licentia Gmbh Handgefuehrte elektrowerkzeugmaschine
DE19904993A1 (de) * 1999-02-08 2000-08-10 Miele & Cie Kondensationswäschetrockner
EP1108812A1 (de) * 1999-12-13 2001-06-20 BSH Bosch und Siemens Hausgeräte GmbH Haushalt-Kondensations-Wäschetrockner und Verfahren zu seinem Betrieb

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135289A1 (de) * 1981-09-05 1983-03-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt "waeschetrockner"
GB2219849A (en) * 1988-06-17 1989-12-20 Zanussi A Spa Industrie Noise reduced tumble dryer
DE3942083A1 (de) * 1989-12-20 1991-06-27 Licentia Gmbh Handgefuehrte elektrowerkzeugmaschine
EP0434169A2 (de) * 1989-12-22 1991-06-26 OCEAN S.p.A. Herstellungsverfahren und verbesserter Trommeltrockner
DE19904993A1 (de) * 1999-02-08 2000-08-10 Miele & Cie Kondensationswäschetrockner
EP1108812A1 (de) * 1999-12-13 2001-06-20 BSH Bosch und Siemens Hausgeräte GmbH Haushalt-Kondensations-Wäschetrockner und Verfahren zu seinem Betrieb

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1666657A1 (de) 2004-12-01 2006-06-07 Electrolux Home Products Corporation N.V. Geräuscharmer Haushaltstrockner
US9644310B2 (en) 2005-03-08 2017-05-09 Electrolux Home Products Corporation N. V. Household clothes drying machine with clothes disinfection cycle
EP1700944A1 (de) 2005-03-08 2006-09-13 Electrolux Home Products Corporation N.V. Haushaltswäschetrockner mit Wäsche-Desinfizierungszyklus
WO2007093274A1 (en) * 2006-02-15 2007-08-23 Electrolux Home Products Corporation N.V. Domestic clothes drier with twin fan
EP1959048A1 (de) * 2007-02-15 2008-08-20 Electrolux Home Products Corporation N.V. Wäschetrockner mit verbesserter Dampfinjektionsanordnung
WO2008098718A1 (en) * 2007-02-15 2008-08-21 Electrolux Home Products Corporation N.V. Clothes drying machine with improved vapour injecton arrangement
US8082678B2 (en) 2007-02-15 2011-12-27 Electrolux Home Products Corporation N.V. Clothes drying machine with improved vapour injection arrangement
CN103225625A (zh) * 2013-03-28 2013-07-31 无锡小天鹅股份有限公司 离心风扇和具有其的干衣机
EP2980304A4 (de) * 2013-03-28 2016-09-14 Wuxi Little Swan Co Ltd Zentrifugallüfter und wäschetrockner damit
WO2014153748A1 (zh) * 2013-03-28 2014-10-02 无锡小天鹅股份有限公司 离心风扇和具有其的干衣机
US20160161133A1 (en) * 2014-12-08 2016-06-09 Tornado Systems Co., Ltd. Ventilation module with swirler fan
US10082305B2 (en) * 2014-12-08 2018-09-25 Tornado Systems Co., Ltd. Ventilation module with swirler fan
CN109209993A (zh) * 2018-11-09 2019-01-15 嵊州市天骏电器有限公司 一种用于集成灶具的风轮及其制造方法
CN109209993B (zh) * 2018-11-09 2020-08-11 嵊州市法帝电器有限公司 一种用于集成灶具的风轮及其制造方法

Also Published As

Publication number Publication date
EP1475474B1 (de) 2007-03-07
ES2283895T3 (es) 2007-11-01
DE602004005098T2 (de) 2007-11-22
DE602004005098D1 (de) 2007-04-19
SI1475474T1 (sl) 2007-08-31
ATE356244T1 (de) 2007-03-15
ITPN20030015U1 (it) 2004-11-10

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