EP0452678A2 - Control assembly for a combined laundry washing and drying machine - Google Patents
Control assembly for a combined laundry washing and drying machine Download PDFInfo
- Publication number
- EP0452678A2 EP0452678A2 EP91104069A EP91104069A EP0452678A2 EP 0452678 A2 EP0452678 A2 EP 0452678A2 EP 91104069 A EP91104069 A EP 91104069A EP 91104069 A EP91104069 A EP 91104069A EP 0452678 A2 EP0452678 A2 EP 0452678A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tub
- control assembly
- heater element
- washing liquid
- 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.)
- Granted
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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
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/08—Control circuits or arrangements thereof
-
- 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
- D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air
Abstract
The control assembly comprises a pressure switch (16) controlling the washing liquid charging level in the tub (5) and a safety pressure switch (17), operable to individually energize one or the other of the electric heater elements (10, 15) when the washing liquid is at its maximum level, or when said tub (5) is empty, respectively, in the course of respective laundry washing and drying cycles, respectively.
The thus composed control assembly is of simple construction and reliable in operation.
Description
- The invention relates to a control assembly for a combined laundry washing and drying machine adapted to permit the completely automatic execution by the machine of selected laundering and drying cycles.
- In known types of combined machines for laundry washing and drying operations, in which a drum charged with the laundry is rotatably mounted in a tub, and the laundry is washed in successive phases by the repeated recirculation of a laundering liquid from a collector receptacle connected to a bottom portion of the tub to the upper portion of the tub, whereat the laundering liquid is sprinkled onto the laundry, the laundry is subsequently subjected to a succession of drying cycles, after the laundering liquid has been discharged from the tub at the end of the washing phases, by the circulation of a drying air flow through the laundry at temperatures selected in accordance with the type of the laundry to be dried, this air flow being produced by an associated blower and heated by at least one conventional electric heater element, and circulating through a separate conduit communicating with the bottom and top portions of the tub to thereby progressively dry the moist laundry contained in the drum.
- Combined machines of this type are provided with an electric heater element for heating the laundering liquid, associated to conventional thermostat switches operable to repeatedly energize and deenergize the heater element in the course of each operating cycle, and optionally controlled by a heater protection device comprising a conventional safety thermostat switch operable to deenergize the heater element when the tub or collector receptacle containing the heater element is empty.
- Machines of this type are in addition provided with a drying air heater element adapted to be repeatedly energized and deenergized in the course of each drying cycle to thereby establish different drying air temperatures in accordance with the type of laundry to be dried, in particular, lower temperatures for drying delicate fabrics (synthetics and the like) and higher temperatures for drying more resistant fabrics (cotton, linnen and the like).
- Although the known machines of this type function in a satisfactory manner, the require the incorporation of specific per se known control devices for energizing and deenergizing the electric liquid heater element and the washing liquid recirculation pump in the course of the various laundering cycles, and the drying air heater element and the blower in the course of the selected drying cycles, these control devices including a number of electromechanical or electronic components resulting in a rather complicated construction and reduced reliability of the machine as a whole.
- It is an object of the present invention to eliminate the above discussed shortcomings by the provision of a control assembly for a combined laundry washing and drying machine, the control assembly to be of simple construction, reliable in operation, and capable of controlling the execution of the laundering and drying operations by the respective machine.
- The control assembly according to the invention is realized with the characteristics as substantially described with particular reference to the drawings attached to the present description. The construction of the control assembly according to the invention will become more clearly evident from the following description, given by way of example with reference to the accompanying drawings, wherein:
- fig. 1
- shows a diagrammatic illustration of a combined laundry washing and drying machine provided with a control assembly according to the invention, and
- fig. 2
- shows an electric circuit diagram of the control assembly according to the invention.
- Diagrammatically shown in fig. 1 is a combined laundry washing and
drying machine 3 comprising a sheet metal housing 4 enclosing alaundering tub 5 with a rotatable drum 6 mounted therein for containing the laundry to be laundered and dried. The machine further comprises a washingliquid collector receptacle 7 connected to a bottom portion oftub 5 and to a recirculation conduit 8 having arecirculation pump 9 inserted therein. The free end of conduit 8 terminates at a top portion oftub 5, so that the laundry washing operation is carried out by the repeated recirculation of the washing liquid from the bottom portion oftub 5 to its top portion, whereat the washing liquid is sprinkled onto the laundry. In addition, the present combined machine comprises at least oneelectric heater element 10 of a given capacity located incollector receptacle 7 or in the bottom portion oftub 5 for heating the washing liquid supplied to the tub and to the receptacle to the temperature required for the various laundering cycles.Collector receptacle 7 is additionally in communication with a discharge pump 11 provided with a (not shown) fluff filter and connected to aflexible discharge hose 12 for the discharge of the washing and rinsing liquids at the end of each phase of the selected laundering cycle. For the execution of selected laundry drying cycles, the present combined machine further comprises a hot-air circulation conduit 13 including ablower 14 and at least oneelectric heater element 15 of a given rated capacity preferably located in the top portion oftub 5 which is of a suitable shape for the accommodation of the heater element.Circulation circuit 13 has its respective ends connected to discharge pump 11 upstream of the associated fluff filter in the direction of discharge of the liquids fromtub 5, and to the top portion oftub 5 adjacent the location of the heater element. - The combined machine further includes at least one liquid level
control pressure switch 16 or the like for controlling the admission of a washing liquid totub 5 up to a predetermined level so as to maintain the laundry in a soaked state during the washing liquid recirculation phases in the course of a selected laundering cycle, and preferably an additional protection device for guarding against the lack of liquid intub 5 and/orcollector receptacle 7, comprising at least one conventionalsafety pressure switch 17 adapted to function in response to a liquid level lower than that defined above so as to keepheater element 10 always covered by the laundering liquid. - The combined machine finally includes
safety thermostat switches - With reference now to fig. 2, there is shown the electric circuit diagram of the control assembly according to the invention incorporated in the present combined laundry washing and drying machine. As shown in this figure,
safety pressure switch 17 includes twofixed contacts movable contact 22 connected to amain conductor 23 of the electric circuit of the machine and adapted to be switched onto one or the other offixed contacts tub 5 is empty or contains a washing liquid at a level below that to which the pressure switch is set to respond, i.e. whenheater element 10 is not covered by the liquid, and when the tub is filled up to the predetermined response level andheater element 10 is covered with the washing liquid.Pressure switch 16 on its part comprises twofixed contacts movable contact 26 adapted to be connected to theneutral conductor 27 of the electric circuit of the machine by anelectric switch 28 operable by a corresponding cam of the program control unit (not shown) of the machine,movable contact 26 being adapted to be switched onto one or the other offixed contacts tub 5 is empty or filled with washing liquid to a level below the predetermined maximum level, and when the tub is filled up to the predetermined maximum level. In particular,fixed contacts pressure switches safety thermostat switch 18 and washingliquid heater element 10, whilerecirculation pump 9 is connected betweenfixed contact 21 ofpressure switch 21 andneutral conductor 27 through anelectric switch 29 operable by another cam of the program control unit of the machine. Fixedcontacts pressure switches safety thermostat switch 19 and dryingair heater element 15, whileblower 14 is connected between fixedcontact 20 ofpressure switch 17 and theconnection point 30 betweenrecirculation pump 9 andelectric switch 29. Discharge pump 11 on its part is directly connected betweenconductors electric switch 31 operable by a corresponding cam of the program control unit, Whileheater element 15 has anotherelectric heater element 33 connected in parallel thereto and adapted to be energized by a manually operableelectric switch 32. The maximum temperature developed byheater element 33 for heating the drying air is lower than that developed byheater element 15. - From the above description, the functions of the control assembly according to the invention will become readily evident. When the machine is set to execute any selected laundering program,
tub 5 andcollector receptacle 7 are initially empty, so thatmovable contacts pressure switches fixed contacts electric switches - Under these conditions, a washing liquid is progressively admitted to the
tub 5 andcollector receptacle 7, in the per se known manner, until the maximum level as determined bypressure switch 16 is attained, at which timemovable contacts pressure switches fixed contacts heater element 10 is energized to progressively heat the washing liquid. At the same time the program control unit acts to closeswitch 29, so thatrecirculation pump 9 is energized to initiate the recirculation of the washing liquid via conduit 8, whereby the laundry is sprinkled with the washing liquid. At the end of the selected washing cycle, the program control unit acts to openelectric switches electric switch 31, so as to deenergizeheater element 10 andrecirculation pump 9 while energizing discharge pump 11, as a result of which all of the washing liquid is discharged fromtub 5 andcollector receptacle 7. This results inmovable contacts pressure switches fixed contacts electric switches air heater element 15 andblower 14 are energized viamovable contacts pressure switches movable contact 22 ofpressure switch 17. In this manner the energization ofheater element 15 permits more resistant fabrics such as cotton, linnen and the like to be dried, while in the presence of more delicate fabrics such as synthetics and the like,electric switch 32 is manually operated to energizeheater element 33 instead ofheater element 15, so that the drying operation is carried out at a lower temperature. - It is thus evident that the described control assembly permits the selective execution of laundry washing and/or drying cycles by the combined machine to be automatically controlled by the use of the two
pressure switches - Finally, and as shown in figs. 1 and 2, the control assembly additionally includes a
suitable solenoid valve 34 for admitting mains water to thetub 5 of the machine, the water being directed through adetergent container 35 filled with a granular detergent and connected to the top portion of the tub.Solenoid valve 34 is connected betweenconductors electric switch 36 operable by an associated cam of the program control unit of the machine. In the present case it is also possible to supply a liquid detergent contained in aseparate container 37 located in the lower part of the housing 4 of the combinedmachine 3 and connected to the top portion oftub 5 through adetergent conduit 38 including apump 39 which is electrically connected between fixedcontact 21 ofsafety pressure switch 17 and fixedcontact 24 ofpressure switch 16. In this manner the present control assembly selectively operates to control the supply totub 5 of granular detergent contained incontainer 35 together with the admission of water to the tub, by closingelectric switch 36 for the energization ofsolenoid valve 34, or of a liquid detergent fromcontainer 37 by the energization ofpump 39 alone. In the latter case, that is, whencontainer 35 is not filled with a granular detergent,switch 36 is closed in the first place to energizesolenoid valve 34 for the admission of water to the tub until the maximum level as determined bysafety pressure switch 17 is attained, at which timemovable contact 22 of this pressure switch is switched from fixedcontact 20 onto fixedcontact 21. Subsequently the program control unit of the machine acts to openelectric switch 36 to thereby deenergizesolenoid valve 34 for terminating the admission of water totub 5, and to closeelectric switch 28 to thereby energizepump 39 throughmovable contact 26 ofpressure switch 16 which under the prevailing operative condition is closed on fixedcontact 24 of this pressure switch, in view of the fact that the water admitted to the tub has not yet attained its maximum charge level as determined by the setting ofpressure switch 16. -
Pump 39 is maintained in the energized state for a period of time determined in accordance with the type and amount of laundry to be washed, so that the amount of liquid detergent supplied totub 5 is in proper proportion to the total amount of water already admitted and to be admitted to the tub. Subsequently the program control unit again acts to closeelectric switch 36 for the energization ofsolenoid valve 34, so that an additional amount of water is admitted to the tub together with the liquid detergent -pump 39 being meanwhile maintained in operation - until the maximum level as determined bypressure switch 16 is attained. At this time,movable contact 26 ofpressure switch 16 is automatically switched over ontofixed contact 25, while the program control unit acts to openelectric switch 36 to thereby terminate the supply of the liquid detergent as well as the admission of water to the tub and permit the selected laundry washing cycle to be effectively executed. - The control assembly according to the invention finally includes a
further solenoid valve 40 disposed in a conduit 41 connected to the water supply circuit of the machine and opening into the hot-air circulation conduit 13,solenoid valve 40 being connected betweenconductors electric switch 42 operable by an associated cam of the program control unit of the machine. In particular, the program control unit acts to closeelectric switch 42 in the course of a drying operation of the present combined machine to thereby energizesolenoid valve 40 for spraying cold water intoair circulation conduit 13 to the purpose of condensing the water vapour released by the laundry being dried and entrained in the hot air flow. The resulting condensate collects inreceptacle 7 of the machine and is successively discharged therefrom by the operation of discharge pump 11, permitting in this manner to obtain a substantially dry hot-air flow throughconduit 13 for rapidly and efficiently drying the laundry.
Claims (4)
- A control assembly for a combined laundry washing and drying machine comprising a laundering tub, a rotatable drum for containing the laundry to be washed and dried, a washing liquid receptacle connected to a bottom portion of said tub and, through a recirculation conduit including a recirculation pump, to a top portion of said tub for sprinkling said washing liquid onto the laundry, a first and a second electric heater element each having a respective rated capacity for heating said washing liquid and drying air caused to circulate by the action of blower means through another conduit connected to top and bottom portions of said tub, at least a first and a second pressure switch or similar level control element provided respectively for controlling the liquid charge level in said tub and for protecting said first heater element from damage caused by lack of washing liquid, and a discharge pump connected to a first and a second conductor of the electric circuit of the machine, said control assembly being characterized by comprising selector means (16,17) operable respectively to individually energize said first or second heater element (10, 15) when said tub (5) is filled with said washing liquid up to the maximum charging level, or when said tub (5) is completely empty.
- A control assembly according to claim 1, characterized in that said selector means comprise respective movable contacts (26, 22) of said first and second pressure switches (16,17), one said movable contact (26) being connected to said second conductor (27) through at least one electric switch (28) operable by the program control unit of the machine, the other said movable contact (22) being connected to said first conductor (23) and operable to energize either said recirculation pump (9) or said blower means (14) through a further electric switch (29) operable by said program control unit in the case, respectively, of said tub (5) being filled with said washing liquid to its maximum level, or of said tub being empty.
- A control assembly according to claim 2, characterized by comprising at least one additional heater element (33) of reduced capacity adapted to be connected in parallel with said second heater element (15) through at least one electric switch (32).
- A control assembly according to claim 2, comprising in addition at least one pump for supplying liquid detergents to said laundering tub, characterized in that said pump (39) is adapted to be energized through said movable contacts (26, 22) of said first and second pressure switches (16, 17), respectively, until the maximum charge level as determined by said first pressure switch (16) is attaiend.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT45722A IT1239195B (en) | 1990-04-18 | 1990-04-18 | CONTROL DEVICE FOR COMBINED MACHINES FOR LAUNDRY AND DRYING OF LINEN |
IT4572290 | 1990-04-18 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0452678A2 true EP0452678A2 (en) | 1991-10-23 |
EP0452678A3 EP0452678A3 (en) | 1992-07-22 |
EP0452678B1 EP0452678B1 (en) | 1995-11-08 |
Family
ID=11257710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91104069A Expired - Lifetime EP0452678B1 (en) | 1990-04-18 | 1991-03-15 | Control assembly for a combined laundry washing and drying machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0452678B1 (en) |
DE (1) | DE69114341T2 (en) |
IT (1) | IT1239195B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0740008A2 (en) * | 1995-04-29 | 1996-10-30 | Whirlpool Europe B.V. | Safety switching apparatus against dry operation of electrical heating resistances, particularly for washing machines and dishwashers |
EP2570544A1 (en) * | 2011-09-15 | 2013-03-20 | Electrolux Home Products Corporation N.V. | Washing machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9139951B2 (en) | 2012-08-06 | 2015-09-22 | Whirlpool Corporation | Laundry treating appliance and method of controlling the heater thereof |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2167000A1 (en) * | 1970-04-08 | 1977-10-06 | Beges Ag I L | MACHINE FOR WASHING, RINSING AND DRYING IN PARTICULAR IRON-FREE LAUNDRY |
EP0252323A2 (en) * | 1986-07-11 | 1988-01-13 | INDUSTRIE ZANUSSI S.p.A. | Combined laundry washing and drying machine |
-
1990
- 1990-04-18 IT IT45722A patent/IT1239195B/en active IP Right Grant
-
1991
- 1991-03-15 DE DE69114341T patent/DE69114341T2/en not_active Expired - Fee Related
- 1991-03-15 EP EP91104069A patent/EP0452678B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2167000A1 (en) * | 1970-04-08 | 1977-10-06 | Beges Ag I L | MACHINE FOR WASHING, RINSING AND DRYING IN PARTICULAR IRON-FREE LAUNDRY |
EP0252323A2 (en) * | 1986-07-11 | 1988-01-13 | INDUSTRIE ZANUSSI S.p.A. | Combined laundry washing and drying machine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0740008A2 (en) * | 1995-04-29 | 1996-10-30 | Whirlpool Europe B.V. | Safety switching apparatus against dry operation of electrical heating resistances, particularly for washing machines and dishwashers |
EP0740008A3 (en) * | 1995-04-29 | 1998-01-28 | Whirlpool Europe B.V. | Safety switching apparatus against dry operation of electrical heating resistances, particularly for washing machines and dishwashers |
EP2570544A1 (en) * | 2011-09-15 | 2013-03-20 | Electrolux Home Products Corporation N.V. | Washing machine |
Also Published As
Publication number | Publication date |
---|---|
IT1239195B (en) | 1993-09-28 |
DE69114341D1 (en) | 1995-12-14 |
EP0452678A3 (en) | 1992-07-22 |
IT9045722A1 (en) | 1991-10-18 |
IT9045722A0 (en) | 1990-04-18 |
DE69114341T2 (en) | 1996-04-18 |
EP0452678B1 (en) | 1995-11-08 |
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