EP0045288B1 - Laundry drying machine - Google Patents

Laundry drying machine Download PDF

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Publication number
EP0045288B1
EP0045288B1 EP81830133A EP81830133A EP0045288B1 EP 0045288 B1 EP0045288 B1 EP 0045288B1 EP 81830133 A EP81830133 A EP 81830133A EP 81830133 A EP81830133 A EP 81830133A EP 0045288 B1 EP0045288 B1 EP 0045288B1
Authority
EP
European Patent Office
Prior art keywords
wall
rotary drum
filtering
perforated
laundry
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.)
Expired
Application number
EP81830133A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0045288A1 (en
Inventor
Filippo Culmone
Antonio Escarbot
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.)
Fusioni simes Industria Meccanica E Sta Soc
Original Assignee
MEA 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
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Application filed by MEA Srl filed Critical MEA Srl
Publication of EP0045288A1 publication Critical patent/EP0045288A1/en
Application granted granted Critical
Publication of EP0045288B1 publication Critical patent/EP0045288B1/en
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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 
    • D06F58/22—Lint collecting arrangements

Definitions

  • the present invention relates to a rotary- drum laundry-drying machine for domestic use, of the type including:
  • DE-U-71 17075 discloses a laundry-drying machine having a perforated filtering wall for the discharging air, which faces the interior of the rotary drum.
  • the perforated filtering wall is able to retain the fluff which forms within the rotary drum during the drying cycle, preventing its discharge to the external environment.
  • the rubbing of the laundry on this perforated filtering wall during the drying cycle prevents this filtering part from becoming covered with fluff and the air flow therethrough being reduced. This would in fact cause an increase in the time needed for the drying cycle, an increase in the working temperature of the machine and, in conclusion, a reduction in the drying efficiency and an increase in the energy consumption.
  • a laundry-drying machine having a structure corresponding to that described at the beginning of this specification is disclosed in DE-A-2 214 619.
  • This machine is of the type including means for condensing the humidity present in the discharging air, said condensing means utilizing cooling water which comes into direct contact with the discharging air.
  • the perforated filtering wall with which this machine is provided has one aperture communicating with the inlet of said condensing means.
  • the fluff which forms during the drying cycle is deposited for the most part on the filtering wall and subsequently removed by the laundry and conveyed to the above mentioned aperture of the filtering wall.
  • the filtering wall is arranged tangentially relative to the rotary drum, and the aperture is located adjacent to the final end of the filtering wall, with reference to the direction of rotation of the rotary drum.
  • the fluff which passes through the aperture of the filtering wall is conveyed into the condensing means, and then discharged by means of cooling water through a water discharge.
  • This known machine has a number of limitations and disadvantages.
  • the problem of correctly dimensioning of aperture of the filtering wall appears to be a critical one. If the aperture is made too small, then it will not allow passage of the fluff removed from the filtering wall. If the aperture is made too large, then the part of the airflow which passes directly through the aperture without being filtered may become important.
  • the location of the aperture in the filtering wall is bound to the direction of rotation of the rotary drum, as explained above.
  • the object of the present invention is to provide a laundry drying machine which allows the said disadvantages to be avoided.
  • the invention provides a laundry drying machine of the type specified at the beginning of this specification, which is characterised in that said filtering means further include an auxiliary perforated filtering wall located within said second passage, and in that this auxiliary perforated filtering wall is situated in a position which cannot be reached by the laundry, so as to collect the material which has been filtered out by the main filtering wall and subsequently removed therefrom by the laundry.
  • the fluff which forms during the drying cycle is deposited partly on the main perforated filtering wall and partly on the auxiliary perforated filtering wall.
  • the fluff which is deposited on the main perforated filtering wall is removed by the laundry within the rotary drum and is conveyed by the drying air flow towards the auxiliary perforated filtering wall, which is traversed by this flow in parallel with the main perforated filtering wall.
  • the main perforated filtering wall always remains clean, guaranteeing an air flow which is sufficient for efficient drying.
  • the auxiliary perforated filtering wall which is situated in such a position that the laundry cannot come into contact with it, collects the fluff removed from the main perforated filtering wall preventing this fluff from re-entering into circulation in the rotary drum.
  • the auxiliary perforated filtering wall is releasably mounted in the machine to facilitate its cleaning at the end of the cycle.
  • the laundry-drying mchine according to the present invention allows elimination of the fluff irrespective whether a condensing device for the humidity in the discharging air flow is used or not. Moreover the structure and arrangement of the filtering means do not depend upon the direction of rotation of the rotary drum. The whole flow of discharging air is filtered by means of the main and auxiliary filtering walls, thus avoiding any possibility of recirculation of the fluff.
  • a rotary drum laundry-drying machine for domestic use is generally indicated 1, the machine comprising a support casing 2 within which is rotatably mounted a cylindrical drum 3.
  • the drum 3 has a laundry loading opening 4 situated in correspondence with a door 5, in the form of a porthole, with which the support casing 2 is provided.
  • the laundry-drying machine 1 is provided with means of a type known per se, not illustrated, for rotatably driving the rotary drum 3 about its axis (which is indicated by the line X-X of Figure 1).
  • the support casing 2 In its wall opposite that provided with the door 5, the support casing 2 has a series of apertures 6 for drawing air into the interior of a passage 7.
  • the passage 7 communicates with the interior cavity 8 of the rotary drum 3 through a series of perforations 9 formed in the back wall of the drum 3, that is, the wall opposite the loading opening 4.
  • An electrical heating resistance 10 is positioned in the passage 7.
  • the interior cavity 8 of the rotary drum 3 communicates through the loading opening 4 with a passage 11 connected to a duct 12 for discharging air from the machine.
  • a suction fan 13 for causing forced circulation of air through the interior of the machine is disposed in the duct 12.
  • the mahine is provided with filtering means operable to separate from the air leaving the rotary drum the particles of fluff which form during the drying cycle.
  • the said filtering means are constituted by a main perforated filtering wall 14 and an auxiliary filtering wall 15.
  • the means filtering wall is constituted (see Figure 2) by a curved wall in the form of a C with its opening facing downwardly, coaxially surrounding the loading opening 4 of the rotary drum 3.
  • the door 5 with which the support casing 2 is provided has an internal, frusto-conical bell shape 16 such as to permit the laundry contained in the rotary drum 3 to come into contact with the wall 14 during the drying cycle.
  • the auxiliary filtering wall is constituted by a trap element located below the wall 14 and having an inlet mouth of rectangular form the two smaller sides of which are adjacent the ends of the curved wall 14.
  • the trap element 15 5 is located within the duct 11 and is realeasably fixed to the wall 14.
  • the mouth of the trap element 15 is provided with transverse elements 15b arranged to prevent the penetration of the smaller items of laundry into the trap element 15 and usable for grasping the trap element 15 in order to extract it from the machine.
  • the fluff which forms during the drying cycle is deposited partly on the perforated filtering wall 14 and partly in the trap element 15.
  • the fluff depositied on the wall 15 is removed from this latter by the action of the laundry itself, contained in the rotary drum 3, which, during the drying cycle, comes into contact with the wall 14.
  • the fluff removed from the wall 14 is carried away into the trap element 15 by the flow of air which traverses the rotary drum 3. In this way the filtering wall 14 always remains clean and, since its effective area is much greater than that of the trap element 15, the filling of this latter with fluff does not significantly alter the rate of flow of drying air.
  • the trap element 15 can be removed from the machine to be cleaned of fluff.
  • Figure 3 is a diagram in which the values of the air flow rate are plotted as a function of time for one drying cycle of the laundry-drying machine.
  • the line indicated A relates to a laundry-drying machine according to the invention
  • the line indicated B relates to a laundry-drying machine of known type provided with a single filtering wall of cylindrical form positioned coaxially adjacent the loading aperture of the rotary drum of the machine.
  • the points intime when the drying cycles of the two laundry-drying machines used for the test are completed have been indicated t A and t ⁇ respectively.
  • Figure 3 shows that by using a machine of the known type the rate of flow of air progressively reduces during the course of the drying cycle.
  • the machine according to the present invention the air flow remains substantially constant for the whole cycle. Thanks to this characteristic the time necessary to effect the drying cycle is reduced.
  • the main filtering wall is constituted by a disc 140 extending perpendicularly to the axis X-X of the rotary drum in correspondence with the door 5, the air which traverses the wall 140 being carried away in the duct 11 a arranged in parallel with the duct 11.
  • the laundry contained in the rotary drum 3 comes into contact with the filtering wall 140 removing the fluff deposited on this latter and avoiding, in this way, a reduction in the rate of flow of air during the drying cycle.
  • the trap element 15 collects the fluff removed from the wall 140 and can be taken out to be cleaned at the end of the cycle.
  • the machine illustrated in Figure 5 differs from the machine illustrated in Figure 4 by the fact that the main filtering wall is constituted by a cylindrical wall 18 disposed coaxially adjacent the loading aperture 4 of the rotary drum 3, and by the fact that the auxiliary filtering wall is constituted by a perforated disc 19 arranged perpendicularly with respect to the axis X-X of the rotary drum 3 in correspondence with the door 5.
  • a perforated spacer wall 20 is arranged over the door 5 to prevent the laundry contained in the rotary drum 3 from coming into contact with the perforated disc 19 during the course of the drying cycle.
  • the perforations in the wall 20 are sufficiently wide to allow the fluff to pass through this wall.
  • the laundry comes into contact with the cylindrical wall 18 removing the fluff deposited on it.
  • the wall 18 constantly remains clean and the rate of flow of air is maintained substantially constant throughout the course of the drying cycle.
  • the fluff removed by the action of the laundry from the cylindrical wall 18 is carried by the flow of air which traverses the rotary drum 3 onto the apertured disc 19 which, at the end of the cycle, can be removed to be cleaned.
  • the main difference between the laundry-drying machine illustrated in Figure 6 and the machine illustrated in the preceding Figures lies in the fact that in the case of Figure 6 the main filtering wall is constituted by a perforated disc 140 positioned, in correspondence with the door 5, perpendicularly with respect to the axis X-X of the machine.
  • the auxiliary filtering wall is constituted, on the other hand, by a cylindrical wall 18 disposed coaxially to the rotary drum 3 adjacent the loading aperture 4 of the rotary drum.
  • the door 5 has a cylindrical wall adjacent the wall 18 so as to prevent, during operation, the laundry contained in the rotary drum 3 from coming into contact with the wall 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP81830133A 1980-07-29 1981-07-29 Laundry drying machine Expired EP0045288B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT68218/80A IT1129123B (it) 1980-07-29 1980-07-29 Procedimento per l asciugatura di biancheria e macchina asciuga biancheria a tamburo rotante per l esecuzione del procedimento
IT6821880 1980-07-29

Publications (2)

Publication Number Publication Date
EP0045288A1 EP0045288A1 (en) 1982-02-03
EP0045288B1 true EP0045288B1 (en) 1984-12-12

Family

ID=11308538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81830133A Expired EP0045288B1 (en) 1980-07-29 1981-07-29 Laundry drying machine

Country Status (3)

Country Link
EP (1) EP0045288B1 (it)
DE (1) DE3167700D1 (it)
IT (1) IT1129123B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003021028A1 (en) * 2001-09-05 2003-03-13 Lg Electronics Inc. Dryer

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669199A (en) * 1986-03-31 1987-06-02 Raytheon Company Clothes dryer with a lint incinerator
FR2646444B1 (fr) * 1989-04-28 1992-02-21 Ciapem Machine a secher et/ou laver munie d'un filtre a bourre
GB2258720A (en) * 1991-08-15 1993-02-17 Creda Ltd Tumble dryer
JP4246761B2 (ja) * 2006-09-27 2009-04-02 パナソニック株式会社 ドラム式洗濯乾燥機
JP4713620B2 (ja) * 2008-09-05 2011-06-29 日立アプライアンス株式会社 洗濯乾燥機
WO2021103917A1 (zh) * 2019-11-26 2021-06-03 青岛海尔滚筒洗衣机有限公司 环形过滤组件和干衣设备
EP4067555A4 (en) * 2019-11-26 2023-01-11 Qingdao Haier Drum Washing Machine Co., Ltd. LAUNDRY DRYER AND FILTRATION DEVICE
WO2021103905A1 (zh) * 2019-11-26 2021-06-03 青岛海尔滚筒洗衣机有限公司 干衣设备
CN114318806A (zh) * 2020-09-30 2022-04-12 青岛海尔智能技术研发有限公司 衣物处理装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886900A (en) * 1955-04-15 1959-05-19 Murray Corp Drier lint collector
US3320683A (en) * 1965-08-09 1967-05-23 Gen Electric Automatic clothes dryer
DE1957844A1 (de) * 1969-11-18 1971-05-27 Arnfried Meyer Trommelmaschine zum Behandeln von Textilien
DE7117075U (de) * 1971-04-28 1972-10-19 Siemens-Electrogeraete Gmbh Nach dem Trommelprinzip arbeitender Wäschetrockner
DE7117465U (de) * 1971-04-30 1972-10-05 Siemens-Electrogeraete Gmbh Nach dem Trommelprinzip arbeitender Wäschetrockner
DE2214619A1 (de) * 1971-09-23 1973-09-27 Siemens Elektrogeraete Gmbh Waeschetrockner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003021028A1 (en) * 2001-09-05 2003-03-13 Lg Electronics Inc. Dryer

Also Published As

Publication number Publication date
DE3167700D1 (en) 1985-01-24
IT1129123B (it) 1986-06-04
EP0045288A1 (en) 1982-02-03
IT8068218A0 (it) 1980-07-29

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