WO2006114802A1 - A forced air circulation system for drying machines and washing/drying machines, particularly for domestic use. - Google Patents

A forced air circulation system for drying machines and washing/drying machines, particularly for domestic use. Download PDF

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Publication number
WO2006114802A1
WO2006114802A1 PCT/IT2006/000269 IT2006000269W WO2006114802A1 WO 2006114802 A1 WO2006114802 A1 WO 2006114802A1 IT 2006000269 W IT2006000269 W IT 2006000269W WO 2006114802 A1 WO2006114802 A1 WO 2006114802A1
Authority
WO
WIPO (PCT)
Prior art keywords
circulation system
impeller
hub
drying machines
washing
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.)
Ceased
Application number
PCT/IT2006/000269
Other languages
French (fr)
Other versions
WO2006114802A8 (en
Inventor
Riccardo Massili
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.)
LN2 Srl
Original Assignee
LN2 Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LN2 Srl filed Critical LN2 Srl
Priority to EP06745294A priority Critical patent/EP1874992A1/en
Publication of WO2006114802A1 publication Critical patent/WO2006114802A1/en
Publication of WO2006114802A8 publication Critical patent/WO2006114802A8/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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 

Definitions

  • the subject of the present invention is a forced air circulation system for drying machines and washing/drying machines, particularly for domestic use.
  • washing/drying machines for domestic use that have a forced hot-air circulation system associated with the washing drum for at least partially drying the garments contained therein upon completion of the washing cycle.
  • the air circulation system usually comprises a feeder duct incorporating an electric fan, generally a centrifugal fan with a cylindrical drum impeller and axially extending blading, which promotes the circulation of the air between the washing drum and a condenser in which the moisture collected is condensed.
  • An electrical resistor is also fitted in the feeder duct in order to heat the air before it is blown amongst the garments being dried in the washing drum.
  • the technical problem underlying the present invention is that of providing a forced air circulation system which is intended particularly for incorporation in washing/drying machines for domestic use and which is designed structurally and functionally to overcome all of the disadvantages discussed with reference to the prior art mentioned.
  • a principle object of the invention is to provide a forced circulation system which enables the filters that are conventionally provided to be omitted without compromising the good operation of the machine.
  • Figure 1 is a schematic, perspective view of the main components of a washing/drying machine according to the invention
  • Figure 2 is a perspective view of a detail of the machine of Figure 1,
  • FIGs 3 to 7 are perspective, front, side, rear and partially- sectioned elevational views, respectively, of a further detail of Figure 2.
  • a washing/drying machine formed in accordance with the present invention comprises, in known manner, a drum 1 rotatable inside a tank 2, as well as a forced air circulation system generally indicated 3.
  • the system 3 in turn is composed of a feeder duct 4 extending between a condenser 5 and an opening 6 for the delivery of the air to the drum.
  • the feeder duct 4 comprises a shell 7 which is closed by an opposing shell portion, not shown, and which houses an impeller 8 of an electric fan 9 and an electrical resistor 10 for heating the air to be introduced into the tank and drum assembly.
  • the shell 7 defines a diffuser with a cyclone configuration housing the impeller 8 and a section which connects the diffuser to the opening 6.
  • the circulation of the air in the system 3 is shown schematically by the arrows F.
  • the impeller 8 is moulded from plastics material and comprises a conical hub 11 having an ogival-shaped front portion.
  • the terms front and rear in the following context relate to the direction of the air flow.
  • the blading of the impeller 8 comprises a plurality of blades 15 which extend substantially radially from the hub 11, from a smaller-diameter, front portion 12 thereof as far as a larger-diameter, rear portion 13 thereof.
  • the blades 15 have a curved shape the curvature of which is reversed with respect to the direction of rotation of the impeller 8.
  • the blades 15 are characterized by curved leading edges 16 which, starting from a front, base portion 17 on the hub in the vicinity of the smaller-diameter, front portion thereof, have a first portion 16a which diverges progressively from the surface of the hub to reach a substantially radial arrangement and which is connected by a large-radius curve to a second portion 16b having a substantially axial arrangement, as the leading edge extends towards the rear portion of the hub.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Cyclones (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A forced air circulation system for drying and washing/drying machines particularly for domestic use, comprising an air feeder duct (4) with a fan (9) provided with a bladed impeller (8) in which the impeller blading comprises a plurality of blades (15) which extend substantially radially from a conical hub (1), from a smaller-diameter, front portion (12) thereof as far as a larger-diameter, rear portion (13) thereof, with a curved shape the curvature of which is reversed with respect to the direction of rotation of the impeller.

Description

DESCRIPTION Technical field
The subject of the present invention is a forced air circulation system for drying machines and washing/drying machines, particularly for domestic use. State of the art
It is known to produce washing/drying machines for domestic use that have a forced hot-air circulation system associated with the washing drum for at least partially drying the garments contained therein upon completion of the washing cycle.
The air circulation system usually comprises a feeder duct incorporating an electric fan, generally a centrifugal fan with a cylindrical drum impeller and axially extending blading, which promotes the circulation of the air between the washing drum and a condenser in which the moisture collected is condensed. An electrical resistor is also fitted in the feeder duct in order to heat the air before it is blown amongst the garments being dried in the washing drum.
Since garments tend to release fibres, fluff and dust during drying, known air circulation systems have to have a filter between the outlet from the washing drum and the fan. It has in fact been found that, if the filter is removed, the fibres tend to be retained by the fan impeller blading leading to a rapid loss of balance of the fan which, because of its fast rotation, is subjected to increasing vibrations to the extent that it may be damaged. There is also a rapid drop in the performance of the fan with increased drying times and potential clogging of the impeller blading. However, the provision of filters leads to a major cost of the system and in turn requires periodic maintenance. Without adequate maintenance of the filters the hot-air flow passing through the garments in the drum progressively decreases as the filters gradually become clogged, with the result that the length of the drying cycle is once again increased. Description of the invention
The technical problem underlying the present invention is that of providing a forced air circulation system which is intended particularly for incorporation in washing/drying machines for domestic use and which is designed structurally and functionally to overcome all of the disadvantages discussed with reference to the prior art mentioned. A principle object of the invention is to provide a forced circulation system which enables the filters that are conventionally provided to be omitted without compromising the good operation of the machine. Brief description of the drawings
This problem, as well as these and other objects of the invention will be explained further by the detailed description of a preferred but not exclusive embodiment thereof which is described by way of non-limiting example with reference to the appended drawings, in which: Figure 1 is a schematic, perspective view of the main components of a washing/drying machine according to the invention,
Figure 2 is a perspective view of a detail of the machine of Figure 1,
Figures 3 to 7 are perspective, front, side, rear and partially- sectioned elevational views, respectively, of a further detail of Figure 2. Preferred embodiment of the invention In Figure 1, a washing/drying machine formed in accordance with the present invention comprises, in known manner, a drum 1 rotatable inside a tank 2, as well as a forced air circulation system generally indicated 3. The system 3 in turn is composed of a feeder duct 4 extending between a condenser 5 and an opening 6 for the delivery of the air to the drum.
The feeder duct 4 comprises a shell 7 which is closed by an opposing shell portion, not shown, and which houses an impeller 8 of an electric fan 9 and an electrical resistor 10 for heating the air to be introduced into the tank and drum assembly.
The shell 7 defines a diffuser with a cyclone configuration housing the impeller 8 and a section which connects the diffuser to the opening 6. The circulation of the air in the system 3 is shown schematically by the arrows F.
The impeller 8 is moulded from plastics material and comprises a conical hub 11 having an ogival-shaped front portion. The terms front and rear in the following context relate to the direction of the air flow. The blading of the impeller 8 comprises a plurality of blades 15 which extend substantially radially from the hub 11, from a smaller-diameter, front portion 12 thereof as far as a larger-diameter, rear portion 13 thereof. The blades 15 have a curved shape the curvature of which is reversed with respect to the direction of rotation of the impeller 8.
The blades 15 are characterized by curved leading edges 16 which, starting from a front, base portion 17 on the hub in the vicinity of the smaller-diameter, front portion thereof, have a first portion 16a which diverges progressively from the surface of the hub to reach a substantially radial arrangement and which is connected by a large-radius curve to a second portion 16b having a substantially axial arrangement, as the leading edge extends towards the rear portion of the hub.
By virtue of this particular geometrical arrangement, which could reasonably be defined as a mixed axial-radial geometrical arrangement, and by virtue of the reversed curvature of the blades, of the conical or at least tapered shape of the hub, and of the curved leading edges of the blades with the particular shape of the leading edge just described, it has been found that fibres, fluff and dust pass freely through the impeller without being deposited on the blading, allowing the filters which, according to the prior art, are generally placed between the condenser and the feeder duct, to be omitted.

Claims

1. A forced air circulation system for drying and washing/drying machines, particularly for domestic use, comprising an air feeder duct (4) with a fan (9) provided with a bladed impeller (8) and characterized in that the 5 impeller blading comprises a plurality of blades (15) which extend substantially radially from a conical hub (11), from a smaller-diameter, front portion (12) thereof as far as a larger-diameter, rear portion (13) thereof, with a curved shape the curvature of which is reversed with respect to the direction of rotation of the impeller.
10 2. A forced circulation system according to Claim 1 in which the blades (15) have curved leading edges (16) which, starting from a front, base portion (17) on the hub in the vicinity of the smaller-diameter, front portion thereof, have a first portion (16a) which diverges progressively from the surface of the hub to reach a substantially radial arrangement
15. and which is connected by a large-radius curve to a second portion (16b) having a substantially axial arrangement, as the leading edge gradually extends towards the rear portion (13) of the hub.
3. A forced circulation system according to Claim 2 in which the front portion (12) of the hub has an ogival shape. 0
4. A forced circulation system according to one or more of the preceding claims in which the impeller (8) is mounted in a diffuser having a cyclone configuration.
5. A forced circulation system according to one or more of the preceding claims in which a resistance heater (10) is mounted in the diffuser, 5 downstream of the cyclone portion thereof.
6. A forced circulation system according to one or more of the preceding claims, characterized in that it has no filter.
PCT/IT2006/000269 2005-04-27 2006-04-20 A forced air circulation system for drying machines and washing/drying machines, particularly for domestic use. Ceased WO2006114802A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06745294A EP1874992A1 (en) 2005-04-27 2006-04-20 A forced air circulation system for drying machines and washing/drying machines, particularly for domestic use.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2005A000116 2005-04-27
IT000116A ITPD20050116A1 (en) 2005-04-27 2005-04-27 FORCED AIR CIRCULATION SYSTEM FOR DRYING MACHINES AND WASHING MACHINES-DRYERS, PARTICULARLY FOR HOUSEHOLD USE.

Publications (2)

Publication Number Publication Date
WO2006114802A1 true WO2006114802A1 (en) 2006-11-02
WO2006114802A8 WO2006114802A8 (en) 2007-04-26

Family

ID=36717182

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2006/000269 Ceased WO2006114802A1 (en) 2005-04-27 2006-04-20 A forced air circulation system for drying machines and washing/drying machines, particularly for domestic use.

Country Status (4)

Country Link
EP (1) EP1874992A1 (en)
IT (1) ITPD20050116A1 (en)
RU (1) RU2007143968A (en)
WO (1) WO2006114802A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2166145A1 (en) * 2008-09-23 2010-03-24 Samsung Electronics Co., Ltd. Clothing dryer
CN103726279A (en) * 2012-10-12 2014-04-16 苏州三星电子有限公司 Condensation type drying device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035030A (en) * 1974-07-05 1977-07-12 Temafa, Textilmaschinenfabrik Meissner, Morgner & Co. Gmbh Device for pneumatically conveying fibers or fiber-containing materials
EP0328250A1 (en) * 1988-01-13 1989-08-16 Creda Limited Tumble driers
EP0566476A1 (en) * 1992-04-14 1993-10-20 Esswein S.A. Impeller cleaning for a washing/drying machine
DE4403224A1 (en) * 1994-02-03 1995-08-10 Vorwerk Co Interholding Radial fan wheel
US20040240999A1 (en) * 2003-04-25 2004-12-02 Kioritz Corporation Centrifugal blower fan
JP2005058658A (en) * 2003-08-20 2005-03-10 Toshiba Corp Washing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035030A (en) * 1974-07-05 1977-07-12 Temafa, Textilmaschinenfabrik Meissner, Morgner & Co. Gmbh Device for pneumatically conveying fibers or fiber-containing materials
EP0328250A1 (en) * 1988-01-13 1989-08-16 Creda Limited Tumble driers
EP0566476A1 (en) * 1992-04-14 1993-10-20 Esswein S.A. Impeller cleaning for a washing/drying machine
DE4403224A1 (en) * 1994-02-03 1995-08-10 Vorwerk Co Interholding Radial fan wheel
US20040240999A1 (en) * 2003-04-25 2004-12-02 Kioritz Corporation Centrifugal blower fan
JP2005058658A (en) * 2003-08-20 2005-03-10 Toshiba Corp Washing machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2166145A1 (en) * 2008-09-23 2010-03-24 Samsung Electronics Co., Ltd. Clothing dryer
US20100071224A1 (en) * 2008-09-23 2010-03-25 Samsung Electronics Co., Ltd. Clothing dryer
US8615896B2 (en) 2008-09-23 2013-12-31 Samsung Electronics Co., Ltd. Clothing dryer
CN103726279A (en) * 2012-10-12 2014-04-16 苏州三星电子有限公司 Condensation type drying device

Also Published As

Publication number Publication date
ITPD20050116A1 (en) 2006-10-28
RU2007143968A (en) 2009-06-10
WO2006114802A8 (en) 2007-04-26
EP1874992A1 (en) 2008-01-09

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