EP3077589A1 - Method for drying laundry - Google Patents

Method for drying laundry

Info

Publication number
EP3077589A1
EP3077589A1 EP14828528.1A EP14828528A EP3077589A1 EP 3077589 A1 EP3077589 A1 EP 3077589A1 EP 14828528 A EP14828528 A EP 14828528A EP 3077589 A1 EP3077589 A1 EP 3077589A1
Authority
EP
European Patent Office
Prior art keywords
drum
rotation
speed
rotating
stage
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
EP14828528.1A
Other languages
German (de)
French (fr)
Other versions
EP3077589B1 (en
Inventor
Mariangiola Dottori
Lorenzo Verdini
Mauro MANCINI
Nicola Colucci
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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 Indesit Co SpA filed Critical Indesit Co SpA
Publication of EP3077589A1 publication Critical patent/EP3077589A1/en
Application granted granted Critical
Publication of EP3077589B1 publication Critical patent/EP3077589B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/16—Air properties
    • D06F2105/20—Temperature
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting

Definitions

  • the object of the present invention is a method for drying laundry.
  • a method for drying laundry implemented by a condenser drier or heat pump drier is known. According to this known method, the laundry located in a rotating drum are subjected to a flow of heated air until the moisture level detected in the laundry items has dropped below a predetermined threshold.
  • the technical task underlying the present invention is to overcome the above-mentioned drawbacks and to make available a method capable of reducing the energy consumption associated with the drying cycle.
  • - Figure 2 is a time-temperature graph of a drying program according to the present invention (with time represented on the x-axis and temperature on the y-axis); - Figures 3-8 show different arrangements of the laundry items in a drum of a drying device that implements the method according to the present invention.
  • the object of the present invention is a method for drying laundry located in a rotating drum 2 of a household drying appliance 1 .
  • this household drying appliance can consist of a washer-drier or a drier.
  • the drum 2 comprises:
  • the method comprises the stage of carrying out a first drying process A for drying the laundry until a first predetermined operational condition is reached.
  • the stage of carrying out a first drying process A for drying the laundry conveniently comprises using a flow of air of a temperature of less than 140°C at the inlet of a drying compartment 4.
  • the stage of carrying out the first drying process A for drying the laundry conveniently comprises that the drum 2 alternates an interval of time in which the speed of rotation is within a range of 50 to 70 revolutions/min, an interval of time in which it is within a range of 80 to 100 revolutions/min and an interval of time in which the drum 2 stops moving.
  • the drying compartment 4 is the compartment that houses the drum 2.
  • the first drying process A is affected by the amount of laundry placed in the drum 2, that is, by the laundry load.
  • the upper curve represents the temperature detected by a sensor located in the proximity of the air inlet in the drying compartment 4.
  • the lower curve represents the temperature detected by a sensor located in the drying compartment 4 below the drum 2.
  • the first predetermined operational condition is based on the residual moisture level of the laundry located in the drum 2.
  • the method comprises the stage of carrying out a second drying process B for drying the laundry which implements a repeated procedure.
  • the procedure thus comprises repeated cycles.
  • This procedure comprises the stages of:
  • the lower speed of rotation acts in such a manner that there is less of a concentration of laundry items at the side wall 23, as they are closer to the axis of rotation and thus opposite the opening 20.
  • the opening 20 coincides with the opening for insertion (and removal) of the laundry to be dried.
  • the stage of directing a flow of air into the drum 2 conveniently takes place, at least in part, at the same time as the stage of rotating said drum at the first, the second, and the third speed of rotation.
  • the adjectives "first”, “second” and “third” accompanied by the noun "speed” serve to distinguish one speed from the other. Accordingly, but not necessarily, in each repetition of the cycle of said procedure, the stage of rotating said drum 2 at the first speed of rotation takes place prior to the stage of rotating said drum 2 at the second speed of rotation, which, in turn, takes place prior to the stage of rotating said drum 2 at the third speed of rotation.
  • the passage from the first to the second speed of rotation makes it possible to avoid abrupt acceleration, given that the difference in the speeds is more limited than the difference in speeds that would be encountered if the household appliance were to pass from the third to the second speed of rotation.
  • the step of rotating the drum 2 at the first speed of rotation comprises rotation of the drum 2 at a speed ranging between 60 and 90 revolutions/min.
  • the stage of rotating the drum 2 at the second speed of rotation comprises rotation of the drum 2 at a speed ranging between 1 10 and 140 revolutions/min. This range of speed is very important, given that laundry items begin to cluster.
  • the stage of rotating the drum 2 at the third speed of rotation comprises rotation of the drum 2 at a speed ranging between 1 5 and 50 revolutions/min. This enables the laundry items to re-form a cluster at the opening 20 so as to enable specific drying of the laundry items located in front of this opening 20.
  • the stage of rotating the drum 2 at the first speed of rotation takes place for an interval of time within the range of 1 to 3 seconds.
  • the stage of rotating the drum 2 at the second speed of rotation takes place for an interval of time within the range of 4 to 6 seconds.
  • the stage of rotating the drum 2 at the third speed of rotation takes place for an interval of time within the range of 4 to 6 seconds.
  • the stages of rotating the drum 2 at the first, the second and the third speed of rotation comprise rotation of the drum 2 always in the same direction of rotation.
  • the repeated procedure comprises the stages of:
  • the absolute value of the fourth speed of rotation ranges between 50 and 70 revolutions/min.
  • the stage of rotating the drum 2 at the fourth speed takes place for an interval of time within the range of 2 to 4 seconds.
  • the absolute value of the fifth speed of rotation ranges between 70 and 90 revolutions/min.
  • the stage of rotating the drum 2 at the fifth speed takes place for an interval of time within the range of 3 to 5 seconds.
  • the absolute value of the sixth speed of rotation ranges between 15 and 50 revolutions/min.
  • the stage of rotating the drum 2 at the sixth speed of rotation takes place for an interval of time within the range of 4 to 6 seconds.
  • the stages of rotating said drum 2 at a fourth, a fifth and a sixth speed of rotation comprise rotation of the drum 2 in an opposite direction of rotation with respect to the stages of rotating said drum 2 at a first, a second and a third speed of rotation.
  • the drum 2 conveniently stops moving for a period of less than 2 seconds.
  • the drum 2 conveniently stops moving for a period of less than 2 seconds.
  • This pre-set condition is preferably related to having reached a condition related to the residual moisture level of the laundry.
  • this pre-set condition could be linked to the execution of said second drying process B for an interval of time of predefined duration.
  • the invention affords multiple advantages.
  • the new movement process allows for a reduction of energy consumption levels.
  • the new movement process is made up of precise speed steps that are optimized in such a manner as to allow the load to be rhythmically filled with and emptied of air.
  • This mechanism makes the drying process more efficient and uniform.
  • the new movement process allows for directing the jet of warm air, at distinct moments in time, in various areas of the mass of laundry items, facilitating the drying of these items.
  • the air affects the laundry items more evenly, whereas when a load is more compact, the air mainly dries the areas that are more easily reached by the flow of air.
  • the temperature to which the air is heated during the first drying process A can be lowered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A method for drying laundry placed in a rotating drum (2) of a household drying appliance (1), said drum (2) comprising: i) a front part (21) that faces a door (3) of the household appliance (1), when said door is set in a closed position; ii) a base (22) opposite said front part (21); iii) a side wall (23) that encloses an axis of rotation of the drum (2). The method comprises the stage of carrying out a drying process (B) for drying the laundry which implements a procedure that is repeatedly carried out and, in turn, comprises the stages of: -directing a flow of air inside the drum (2) through an opening (20) in the drum (2), said opening (20) being located in said front part (21) or in said base (22) of the drum (2); -rotating said drum (2) at a first speed of rotation so as to push the laundry items towards the side wall (23) of the drum (2) and facilitate entry of the air into a central zone (24) of the drum (2); -rotating said drum (2) at a second speed of rotation that is higher than the first speed of rotation, so as to push the laundry items towards the side wall (23) of the drum (2) more energetically than in the stage of rotating the drum (2) at the first speed of rotation, this making it possible to improve the entry of the air in the central zone (24) of the drum (2); -rotating said drum (2) at a third speed of rotation, said third speed of rotation being lower than the first speed of rotation, so as to make it possible to dry the laundry items located at said opening (20) in the drum (2). The stage of directing a flow of air inside the drum (2) takes place, at least in part, at the same time as the stage of rotating said drum (2) at the first, the second and the third speed of rotation.

Description

DESCRIPTION
METHOD FOR DRYING LAUNDRY
Technocal field
The object of the present invention is a method for drying laundry.
State of the art
A method for drying laundry implemented by a condenser drier or heat pump drier is known. According to this known method, the laundry located in a rotating drum are subjected to a flow of heated air until the moisture level detected in the laundry items has dropped below a predetermined threshold.
One drawback of this design solution concerns the fact that the laundry in the drum can form a compact mass having poor permeability to air and this hinders the drying process.
Aim of the invention
In this context, the technical task underlying the present invention is to overcome the above-mentioned drawbacks and to make available a method capable of reducing the energy consumption associated with the drying cycle.
Brief description of the drawings
The defined technical task and the specified aims are substantially achieved by a method comprising the technical characteristics set forth in one or more of the appended claims.
Further characteristics and advantages of the present invention will become more apparent from the approximate, and thus non-limiting, description of a preferred, but not exclusive embodiment of a method for drying laundry, as illustrated in the accompanying drawings, of which: -Figure 1 is a schematic view of a design solution of a drying device that implements the method according to the invention;
-Figure 2 is a time-temperature graph of a drying program according to the present invention (with time represented on the x-axis and temperature on the y-axis); -Figures 3-8 show different arrangements of the laundry items in a drum of a drying device that implements the method according to the present invention.
Detailed description of preferred embodiments of the invention
The object of the present invention is a method for drying laundry located in a rotating drum 2 of a household drying appliance 1 . For example, this household drying appliance can consist of a washer-drier or a drier.
The drum 2 comprises:
i) a front part 21 that faces a door 3 of the household appliance 1 when said door is set in a closed position;
ii) a base 22 opposite said front part 21 ;
iii) a side wall 23 that encloses an axis of rotation of the drum 2.
The method comprises the stage of carrying out a first drying process A for drying the laundry until a first predetermined operational condition is reached.
The stage of carrying out a first drying process A for drying the laundry conveniently comprises using a flow of air of a temperature of less than 140°C at the inlet of a drying compartment 4. The stage of carrying out the first drying process A for drying the laundry conveniently comprises that the drum 2 alternates an interval of time in which the speed of rotation is within a range of 50 to 70 revolutions/min, an interval of time in which it is within a range of 80 to 100 revolutions/min and an interval of time in which the drum 2 stops moving. The drying compartment 4 is the compartment that houses the drum 2. Conveniently, the first drying process A is affected by the amount of laundry placed in the drum 2, that is, by the laundry load.
In Figure 2, the upper curve represents the temperature detected by a sensor located in the proximity of the air inlet in the drying compartment 4. In the same figure, the lower curve represents the temperature detected by a sensor located in the drying compartment 4 below the drum 2.
Advantageously, the first predetermined operational condition is based on the residual moisture level of the laundry located in the drum 2. Upon reaching the first operational condition, the method comprises the stage of carrying out a second drying process B for drying the laundry which implements a repeated procedure. The procedure thus comprises repeated cycles.
This procedure, in turn, comprises the stages of:
-directing a flow of air inside the drum 2 through an opening 20 in the drum 2, said opening 20 being located in said front part 21 or in said base 22 of the drum 2;
-rotating said drum 2 at a first speed of rotation so as to push the laundry items towards the side wall 23 of the drum 2 and facilitate entry of the air into a central zone 24 of the drum 2 (see Figure 3). In this case, the laundry items are pushed by centrifugal force; note that the laundry items are indicated by reference letter P in Figures 3-8;
-rotating said drum 2 at a second speed of rotation that is higher than the first speed of rotation, so as to push the laundry items towards the side wall 23 of the drum 2 more energetically than in the stage of rotating the drum 2 at the first speed of rotation. This makes it possible to improve the entry of the air in the central zone 24 of the drum 2 (see Figure 4). In this stage, the higher speed of rotation of the drum brings about a greater centrifugal force acting upon the laundry items and thus more forceful pushing of the laundry items towards the side wall 23;
-rotating said drum 2 at a third speed of rotation, said third speed of rotation being lower than the first speed of rotation, so as to make it possible to dry the laundry items located at said opening 20 in the drum 2 (see Figure 5). In this stage, the lower speed of rotation acts in such a manner that there is less of a concentration of laundry items at the side wall 23, as they are closer to the axis of rotation and thus opposite the opening 20. In the preferred solution illustrated in the accompanying figures, the opening 20 coincides with the opening for insertion (and removal) of the laundry to be dried.
The stage of directing a flow of air into the drum 2 conveniently takes place, at least in part, at the same time as the stage of rotating said drum at the first, the second, and the third speed of rotation.
In the course of this description, the adjectives "first", "second" and "third" accompanied by the noun "speed" serve to distinguish one speed from the other. Accordingly, but not necessarily, in each repetition of the cycle of said procedure, the stage of rotating said drum 2 at the first speed of rotation takes place prior to the stage of rotating said drum 2 at the second speed of rotation, which, in turn, takes place prior to the stage of rotating said drum 2 at the third speed of rotation. This makes it possible to optimize the balancing of the household appliance 1 . In fact, the passage from the first to the second speed of rotation makes it possible to avoid abrupt acceleration, given that the difference in the speeds is more limited than the difference in speeds that would be encountered if the household appliance were to pass from the third to the second speed of rotation. Passage from the second to the third speed, however, takes place in the course of deceleration and the balance of the household appliance is less sensitive to deceleration. The risk of slipping or contacts between the rotating parts and fixed parts is thus reduced in the transitions from one speed to another.
The step of rotating the drum 2 at the first speed of rotation comprises rotation of the drum 2 at a speed ranging between 60 and 90 revolutions/min. The stage of rotating the drum 2 at the second speed of rotation comprises rotation of the drum 2 at a speed ranging between 1 10 and 140 revolutions/min. This range of speed is very important, given that laundry items begin to cluster.
The stage of rotating the drum 2 at the third speed of rotation comprises rotation of the drum 2 at a speed ranging between 1 5 and 50 revolutions/min. This enables the laundry items to re-form a cluster at the opening 20 so as to enable specific drying of the laundry items located in front of this opening 20.
Within each repetition of the cycle of the procedure, the stage of rotating the drum 2 at the first speed of rotation takes place for an interval of time within the range of 1 to 3 seconds. The stage of rotating the drum 2 at the second speed of rotation takes place for an interval of time within the range of 4 to 6 seconds. The stage of rotating the drum 2 at the third speed of rotation takes place for an interval of time within the range of 4 to 6 seconds.
The stages of rotating the drum 2 at the first, the second and the third speed of rotation comprise rotation of the drum 2 always in the same direction of rotation.
Following the stage of rotating the drum 2 at the third speed of rotation, the repeated procedure comprises the stages of:
-rotating said drum 2 at a fourth speed of rotation, so as to push the laundry items towards the side wall 23 of the drum 2 and facilitate entry of the air in a central zone 24 of the drum 2 (see Figure 6);
-rotating said drum 2 at a fifth speed of rotation that is higher than the fourth speed of rotation, so as to push the laundry items towards the side wall 23 of the drum 2 more energetically than in the stage of rotating the drum 2 at the fourth speed of rotation, this making it possible to improve the entry of the air in the central zone 24 of the drum 2 (see Figure 7); -rotating the drum 2 at a sixth speed of rotation, said sixth speed of rotation being lower than the fourth speed of rotation, so as to make it possible to dry the laundry items located at said opening 20 in the drum 2 (see Figure 8).
Accordingly, the absolute value of the fourth speed of rotation ranges between 50 and 70 revolutions/min. Within the repeated cycles of the procedure, the stage of rotating the drum 2 at the fourth speed takes place for an interval of time within the range of 2 to 4 seconds.
Accordingly, the absolute value of the fifth speed of rotation ranges between 70 and 90 revolutions/min. Within the repeated cycles of the procedure, the stage of rotating the drum 2 at the fifth speed takes place for an interval of time within the range of 3 to 5 seconds. Accordingly, the absolute value of the sixth speed of rotation ranges between 15 and 50 revolutions/min. Within the repeated cycles of the procedure, the stage of rotating the drum 2 at the sixth speed of rotation takes place for an interval of time within the range of 4 to 6 seconds.
The stages of rotating said drum 2 at a fourth, a fifth and a sixth speed of rotation comprise rotation of the drum 2 in an opposite direction of rotation with respect to the stages of rotating said drum 2 at a first, a second and a third speed of rotation.
This makes it possible to shift the laundry items, preventing excessive clumping thereof (which would make it difficult for the air to penetrate) and preventing wrinkles from setting therein.
Following the stage of rotating the drum 2 at a third speed of rotation and prior to rotating the drum 2 at a fourth speed of rotation, the drum 2 conveniently stops moving for a period of less than 2 seconds.
At the end of the stage of rotating the drum 2 at a sixth speed, the drum 2 conveniently stops moving for a period of less than 2 seconds.
The repetitive procedure is repeated cyclically until a pre-set condition is reached. This pre-set condition is preferably related to having reached a condition related to the residual moisture level of the laundry. In an alternative, though not preferred embodiment, this pre-set condition could be linked to the execution of said second drying process B for an interval of time of predefined duration.
Accordingly, as schematized in Figure 1 , during the second drying process B, the temperature inside the drum 2 gradually decreases.
The invention affords multiple advantages.
First of all, it allows for a reduction of energy consumption levels. In fact, the new movement process is made up of precise speed steps that are optimized in such a manner as to allow the load to be rhythmically filled with and emptied of air. This mechanism makes the drying process more efficient and uniform. Moreover, the new movement process allows for directing the jet of warm air, at distinct moments in time, in various areas of the mass of laundry items, facilitating the drying of these items. In particular, when a load is looser, the air affects the laundry items more evenly, whereas when a load is more compact, the air mainly dries the areas that are more easily reached by the flow of air.
Owing to this particular movement of the drum 2 which involves the final part of the drying cycle, the temperature to which the air is heated during the first drying process A can be lowered.
The invention thus conceived is susceptible to numerous modifications and variants, all of which falling within the scope of the inventive concept characterizing the invention. Moreover, all details may be replaced with other technically equivalent elements. The materials used, as well as the dimensions, may in practice be of any type, according to needs.

Claims

1 . A method for drying laundry placed in a rotating drum (2) of a household drying appliance (1 ), said drum (2) comprising:
i) a front part (21 ) that faces a door (3) of the household appliance (1 ), when said door is set in a closed position;
ii) a base (22) opposite said front part (21 );
iii) a side wall (23) that encloses an axis of rotation of the drum (2);
said method being characterized in that it comprises the stage of carrying out a first drying process (A) for drying the laundry until a first predetermined operational condition is reached and upon reaching the first operational condition, the method comprises the stage of carrying out a second drying process (B) for drying the laundry, said second drying process (B) implementing a repeated process and, in turn, comprising the stages of:
-directing a flow of air inside the drum (2) through an opening (20) in the drum (2), said opening (20) being located in said front part (21 ) or in said base (22) of the drum (2);
-rotating said drum (2) at a first speed of rotation so as to push the laundry items towards the side wall (23) of the drum (2) and facilitate entry of the air into a central zone (24) of the drum (2);
-rotating said drum (2) at a second speed of rotation that is higher than the first speed of rotation, so as to push the laundry items towards the side wall (23) of the drum (2) more energetically than in the stage of rotating the drum (2) at the first speed of rotation, this making it possible to improve the entry of the air in the central zone (24) of the drum (2);
-rotating said drum (2) at a third speed of rotation, said third speed of rotation being lower than the first speed of rotation, so as to make it possible to dry the laundry items located at said opening (20) in the drum (2);
the stage of directing a flow of air inside the drum (2) takes place, at least in part, at the same time as the stage of rotating said drum (2) at the first, the second and the third speed of rotation.
2. The method according to claim 1 , characterized in that in each repetition of the cycle of said procedure, the stage of rotating said drum (2) at the first speed of rotation takes place prior to the stage of rotating said drum (2) at the second speed of rotation, which, in turn, takes place prior to the stage of rotating said drum (2) at the third speed of rotation.
3. The method according to claim 1 or 2, characterized in that the stage of rotating the drum (2) at the first speed of rotation comprises rotation of the drum (2) at a speed ranging between 60 and 90 revolutions/min; the stage of rotating the drum (2) at the second speed of rotation comprises rotation of the drum (2) at a speed ranging between 1 10 and 140 revolutions/min; the stage of rotating the drum (2) at the third speed of rotation comprises rotation of the drum (2) at a speed ranging between 15 and 50 revolutions/min.
4. The method according to claim 1 or 2 or 3, characterized in that the stage of rotating the drum (2) at the first speed of rotation takes place for an interval of time within the range of 1 to 3 seconds; the stage of rotating the drum (2) at the second speed of rotation takes place for an interval of time within the range of 4 to 6 seconds; the stage of rotating the drum (2) at the third speed of rotation takes place for an interval of time within the range of 4 to 6 seconds.
5. The method according to any one of the preceding claims, characterized in that the stages of rotating the drum (2) at the first, the second and the third speed of rotation comprise rotation of the drum (2) always in the same direction of rotation.
6. The method according to any one of the preceding claims, characterized in that following the stage of rotating said drum (2) at a third speed of rotation, the repeated procedure comprises the stages of:
-rotating said drum (2) at a fourth speed of rotation, so as to push the laundry items towards the side wall (23) of the drum (2) and facilitate entry of the air into the central zone (24) of the drum (2); -rotating said drum (2) at a fifth speed of rotation that is higher than the fourth speed of rotation, so as to push the laundry items towards the side wall (23) of the drum (2) more energetically than in the stage of rotating the drum (2) at the fourth speed of rotation, this making it possible to improve the entry of the air in the central zone (24) of the drum (2);
-rotating said drum (2) at a sixth speed of rotation, said sixth speed of rotation being lower than the fourth speed of rotation, so as to make it possible to dry the laundry items located at said opening (20) in the drum (2).
7. The method according to claim 6, characterized in that the stages of rotating said drum (2) at the fourth, the fifth and the sixth speed of rotation comprise rotation of the drum (2) in an opposite direction of rotation with respect to the stage of rotating the drum (2) at said first, second and third speed of rotation.
8. The method according to any one of the preceding claims, characterized in that the repetitive procedure is repeated cyclically until a predetermined condition is reached, said predetermined condition being related to the degree of dryness of the laundry located in the drum (2).
9. The method according to any one of the preceding claims, characterized in that the first predetermined operational condition is based on the residual moisture level of the laundry located in the drum (2).
10. The method according to any one of the preceding claims, characterized in that the stage of carrying out a first drying process (A) for drying the laundry, comprises using a flow of air of a temperature of less than 140 °C at the inlet of a drying compartment (4), said compartment containing said drum (2).
EP14828528.1A 2013-12-04 2014-12-01 Method for drying laundry Active EP3077589B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000100A ITPR20130100A1 (en) 2013-12-04 2013-12-04 CLOTHING DRYING METHOD.
PCT/IB2014/066480 WO2015083062A1 (en) 2013-12-04 2014-12-01 Method for drying laundry

Publications (2)

Publication Number Publication Date
EP3077589A1 true EP3077589A1 (en) 2016-10-12
EP3077589B1 EP3077589B1 (en) 2018-04-25

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EP14828528.1A Active EP3077589B1 (en) 2013-12-04 2014-12-01 Method for drying laundry

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EP (1) EP3077589B1 (en)
IT (1) ITPR20130100A1 (en)
WO (1) WO2015083062A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113862955B (en) * 2021-09-29 2022-08-16 珠海格力电器股份有限公司 Washing equipment control method and device, electronic equipment and storage medium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1311719B1 (en) * 1999-11-29 2002-03-19 Electrolux Zanussi Elettrodome ROTATING BASKET METHOD AND APPARATUS OF THE CONDENSING TYPE FOR DRYING LINEN
ES2340427T3 (en) * 2007-03-30 2010-06-02 Electrolux Home Products Corporation N.V. IMPROVEMENTS IN A CLOTHING DRYING MACHINE AND A CORRESPONDING CLOTHING DRYING METHOD.
ITTO20101070A1 (en) * 2010-12-27 2012-06-28 Indesit Co Spa PROCEDURE AND MACHINE FOR THE LINEN DRYING

Also Published As

Publication number Publication date
ITPR20130100A1 (en) 2015-06-05
WO2015083062A1 (en) 2015-06-11
EP3077589B1 (en) 2018-04-25

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