EP0358849B1 - Procédé pour le séchage de pièces de linge - Google Patents

Procédé pour le séchage de pièces de linge Download PDF

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Publication number
EP0358849B1
EP0358849B1 EP89108833A EP89108833A EP0358849B1 EP 0358849 B1 EP0358849 B1 EP 0358849B1 EP 89108833 A EP89108833 A EP 89108833A EP 89108833 A EP89108833 A EP 89108833A EP 0358849 B1 EP0358849 B1 EP 0358849B1
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EP
European Patent Office
Prior art keywords
laundry
temperature
drying
blower
rotation
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 - Lifetime
Application number
EP89108833A
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German (de)
English (en)
Other versions
EP0358849A3 (en
EP0358849A2 (fr
Inventor
Heinrich Dipl.-Ing. Böcker
Peter Herrmann
Manfred Dipl.-Ing. Schulz
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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Publication date
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Priority to AT89108833T priority Critical patent/ATE97706T1/de
Publication of EP0358849A2 publication Critical patent/EP0358849A2/fr
Publication of EP0358849A3 publication Critical patent/EP0358849A3/de
Application granted granted Critical
Publication of EP0358849B1 publication Critical patent/EP0358849B1/fr
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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
    • D06F58/32—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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/02—Characteristics of laundry or load
    • D06F2101/06—Type or material
    • 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
    • D06F2103/44—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
    • D06F2105/24—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
    • D06F2105/28—Electric heating
    • 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 invention relates to a method for drying laundry items in a drum dryer, in which the laundry is circulated by rotating the laundry drum, which is driven together with a process air blower in the same or in alternating directions of rotation and through which the heated process air flows, the heating output during a (wrong) direction of rotation of the fan, in which it has a reduced air output compared to the other (correct) direction of rotation, can be reduced.
  • the process air is circulated by means of a blower and fed to the laundry after it has been warmed up.
  • the blower is coupled to the drum drive in a cost-damping manner (GB-A-20 51 330), so that it has reduced air performance when reversing in the "wrong" direction of rotation, because the spiral housing of the blower allows an almost unimpeded air flow only in that direction of rotation , whose tangential component coincides at least approximately with the main direction of the fan outlet.
  • This smaller amount of air is then heated more strongly on the radiator of the same power output than with the "correct" direction of rotation.
  • the resulting increased temperature of the drying air can be expected of the laundry with a high moisture content.
  • the heating output is known to be reduced in the "wrong" direction of rotation.
  • the drum rotation direction can be controlled together with the heating output depending on the temperature at the heating output. If, however, the laundry has a lower residual moisture during advanced drying (residual moisture less than 30%), for example with inhomogeneous laundry items and preferably towards the end of the drying process, thermal energy is no longer taken from the process air to the previous extent, so that a high despite the reduction in heating output Process air temperature in the laundry drum (sometimes over 100 ° C) can then lead to laundry damage.
  • the invention is intended to achieve the object of keeping the required drying time as short as possible in a drying process mentioned at the beginning.
  • the energy expenditure should also be kept as low as possible.
  • a complete drying cycle comprises at least three drying sections (I to III) for an unchanged laundry item which, in the first drying section (I), only in the one direction of rotation (I) in which the fan has the full air capacity, in the second drying section (II), which begins when the exhaust air reaches a temperature close to the predetermined drying temperature (eg 60 ° C), only in changing Direction of rotation (l, r) and in the third drying section (III), which begins with a residual moisture content of the laundry of a maximum of 30%, is circulated exclusively in changing directions of rotation (l, r).
  • a complete drying cycle comprises at least three drying sections (I to III) for an unchanged laundry item which, in the first drying section (I), only in the one direction of rotation (I) in which the fan has the full air capacity, in the second drying section (II), which begins when the exhaust air reaches a temperature close to the predetermined drying temperature (eg 60 ° C), only in changing Direction of rotation (l, r) and in the third drying section (III), which begins with a
  • the drying time can be shortened by, for example, 15 minutes compared to the known method in which the reversing operation remains switched on with the heating output temporarily reduced during the entire drying process. This is a time saving of around 33% in relation to the start-up process. Since each item of laundry must first be heated up together with the machine parts and a considerable amount of moisture in the first drying section, the most possible heating energy should be introduced per unit of time.
  • a complete drying cycle comprises at least three drying sections (I to III) for an unchanged laundry item, which in the first drying section (I) only in one direction of rotation (l) in which the The blower has full air capacity in the second drying section (II), which begins when the exhaust air reaches a temperature close to the predetermined drying temperature (e.g. 60 ° C) for the first time, depending on the operator's choice, only in changing directions of rotation (l, r) or only in the one direction of rotation (l), in which the blower has full air output, and in the third drying section (III), which begins with a residual moisture content of the laundry of a maximum of 30%, is circulated exclusively in changing directions of rotation (l, r).
  • a complete drying cycle comprises at least three drying sections (I to III) for an unchanged laundry item, which in the first drying section (I) only in one direction of rotation (l) in which the The blower has full air capacity in the second drying section (II), which begins when the exhaust air reaches a temperature close to the predetermined drying temperature
  • the operator can, by his own choice, shorten the drying time even more and reduce the electrical energy to be used even more if, in the case of smaller items of laundry, the drum direction of rotation in the second drying section is limited to the direction of rotation in which the fan moves the smaller drying items has full air performance.
  • the radiator is operated with a high power output and a large amount of heat is supplied to the drying system and the wet laundry at an approximately constant drying temperature. This saves time again.
  • the temperature in the laundry drum continues to rise because the moisture content of the laundry has now dropped below 30%.
  • sufficient thermal energy can no longer be taken from the process air in order to keep the temperature of the exhaust air at slightly above 60 ° C. by the evaporation of the moisture in the laundry.
  • an exhaust air thermostat is used to monitor and limit this temperature rise.
  • the switching action of the thermostat then ends the second drying section.
  • a third drying section which begins with a residual moisture content of the laundry of a maximum of 30%, the laundry is circulated exclusively in changing directions of rotation. In this way, one can further avoid the risk of laundry items becoming tangled if there is a possibility of limiting the heating output in the "wrong" direction of rotation to a value which causes the exhaust air temperature to drop again to values of approximately 60.degree.
  • this reduction in performance can, for example, only be about 20% of that already not very great high maximum power, but the duration of the "wrong" direction of rotation of the drum should be about the same as that of the "correct" direction of rotation. In contrast to asymmetrical reversing, there is no risk of buckling. During the "wrong" direction of rotation, the process air is then defied the lower heating output warms slightly more than in the "correct" direction of rotation with maximum heating output.
  • the predetermined drying temperature e.g. 60 ° C
  • the drum can now be operated continuously and symmetrically reversing during the second drying section, which can last approximately 55 minutes, so that the risk of tangling is low even with large items of laundry.
  • the reduced heating output in the second drying section (II) during the fan direction of rotation (r) is dimensioned with the reduced air output so that the process air temperature does not substantially exceed 60 ° C.
  • the reduction in heating output can be relatively small, because during the second drying section the laundry still contains a high percentage of water, the evaporation of which consumes a lot of energy, so that the temperature can hardly exceed 60 ° C.
  • the process air in the third drying section is subjected to a reduced heating power for the full air output during the fan direction of rotation and a heating power which is again reduced in comparison to the reduced air output during the direction of rotation. Under certain circumstances, this further reduced heating power is zero.
  • the temperature of the exhaust air rises again, so that its thermostat can finally complete the drying process.
  • the reversing drum movement is continued with the heating switched off. This section is no longer included in the actual drying process and is called the "anti-crease phase".
  • a drum dryer suitable for carrying out the method the laundry drum of which can be operated in a reversing manner and is coupled on the drive side to a process air blower which is arranged together with a heating device in a process air channel, has a switching device for controlling the heating device.
  • the heating device is dependent on a signal from a temperature sensor for the temperature of the exhaust air from the laundry drum when the fan is driven in the direction of rotation for full air output with high heating output, but when the fan is driven in the direction of rotation for reduced air output can be switched to reduced heating output.
  • the heating elements of the heating device are partial resistors that are connected individually or in certain combinations with one another in the circuit. It is therefore unnecessary to control the heating energy output in the sense of a two-point control by means of radiator thermostats.
  • the switching device can be automatically actuated by a measuring device when determining a residual moisture of the laundry of a maximum of 30%.
  • the switching device is designed as a central control unit which, under the control of sensors, initiates the appropriate measures at different locations at different times during the drying process.
  • a particularly advantageous development of the invention is to be seen in the fact that a switch which can be operated by hand is provided, the actuation of which allows the reversing drive to be switched over to a continuous drive and is designed to be switchable back again by the switching device. Furthermore, when the switch is actuated, the heating device is switched to high heating power, but when the switching device responds, at least during operation of the fan in the direction of rotation for reduced air power to reduced heating power. As a result, the switching measure can be recommended to the special attention of the operator, so that the work process can only be switched on with one direction of rotation if there is actually a special requirement for this, namely for a laundry lot with only small parts. This saves time and energy.
  • the heating device can also be switched from the reversing unit to high heating output when the fan works with high air output in the direction of rotation, but can be switched to reduced heating output when the fan operates in the direction of rotation with reduced air output.
  • Diagram line D shows the rotation of the drum drive. The drive stops on the zero line. On the line “l” the drum turns to the left, which is by definition the “correct” direction of rotation, ie the direction of rotation in which the directly coupled fan has full air output.
  • the line “r” indicates the drum rotation direction “right”, in which the fan runs in the "wrong” direction, ie in the direction in which the fan has a reduced air output.
  • the diagram lines “Hzg” indicate the operating mode for the heating device. It can be operated in two (2, 4) or four (1, 2, 3 and 4) stages. Level 0 is called currentless heating, level 1 is the smallest level, ie lowest power, level 4 is the largest level, ie maximum power.
  • the respective temperature of the exhaust air emerging from the laundry drum is plotted in the diagram line T, which represents a usable image of the amount of water still to be evaporated in the laundry.
  • T represents a usable image of the amount of water still to be evaporated in the laundry.
  • the first drying section I in which the machine system and the cold, wet laundry first have to be heated.
  • this first drying section has ended when the exhaust air temperature has reached 60 ° C.
  • This temperature has proven to be suitable as the static temperature in the second drying section II, in which the absorption of the heating energy by the evaporation of water and the energy transfer from the heating device into the process air are roughly balanced.
  • the exhaust air temperature rises because the amount of water that still has to be evaporated from the laundry is already very small, so that only considerably less thermal energy is removed from the process air in order to evaporate the water from the laundry . Therefore, there is an excess of thermal energy, which causes the temperature of the exhaust air to rise. From here on, the heating energy is generally reduced in the subsequent third drying section III, so that the temperature of the exhaust air settles again at 60 ° C. as far as possible. Towards the end of the third drying section, the temperature rises again, a sign that the residual moisture contained in the laundry is only extremely small and that the thermal energy contained in the system is sufficient to evaporate this residual moisture from the laundry. Therefore, you can now switch off the heating device completely and be satisfied with the further reversing drive of the drum, this is the so-called anti-crease phase.
  • the drum is driven in an asymmetrically reversing manner, ie a normally long counterclockwise rotation phase is followed by a short clockwise rotation phase.
  • the heating device is fully switched on in the counterclockwise rotation phase and delivers full heating power.
  • the heating device must be switched off during the clockwise rotation phase, so that the temperature of the process air does not become too high with the associated reduction in air performance.
  • this clockwise rotation phase is dimensioned only briefly.
  • the reversing rhythm is generally measured at 60 to 20 seconds.
  • a typical start-up phase (first drying section I) can take 30 minutes.
  • the temperature of the exhaust air has reached 60 ° C.
  • the subsequent second drying section II takes a little over 60 minutes, for example, with a full laundry load.
  • the temperature then rises and triggers the start of the third drying section.
  • the heating is switched on again when 45 ° C is reached and - apart from the clockwise rotation of the drum and the blower - only switched off again when the switch-off mark reaches 75 ° C is reached again.
  • the unsteady temperature profile can be seen very well from the T diagram in FIG. 1. Its image depends on the times of the left-hand rotation phase or the right-hand rotation phase of the heating device being switched on or off. Since this temperature profile does not allow a definite conclusion about the final residual moisture anyway, this third drying section III is only controlled in terms of time. In the present example from the prior art, the third drying section is limited to 8 minutes. It is followed by the fourth section IV, the anti-crease phase.
  • the operator can switch off the reversing drive for the drum - and thus also for the blower - for part of the drying process, namely for drying section II.
  • the drum drive is switched on, only in the counterclockwise rotation phase corresponding to the solid line in diagram D in FIG. 2, the drum drive is only operated for this direction of rotation in which the blower emits the full air output. Accordingly, the highest heating level 4 is switched on and maintained until the second drying section II has ended. This is done in the same way as in the prior art: when the temperature rises to an upper temperature mark of, for example, 75 ° C.
  • the heating device is switched back, for example, to level 2 on the basis of a signal from a temperature sensor and thus emits approximately half the heating power. Accordingly, the temperature drops again to about 60 ° C until again so little heating energy is taken from the process air by absorbing heat of evaporation that the temperature of the exhaust air rises again.
  • the drum dryer can instead be set up in such a way that the drum drive is switched permanently to the counterclockwise rotation phase only in the first drying phase I.
  • the unidirectional drum drive can be automatically switched to symmetrical reversing drive, for example.
  • the heating device is operated in stage 4 and can be switched to a reduced heating output after switching to reversing drive during the respective clockwise rotation phase.
  • this reduced heating output in the second drying section II can be level 3, which means, for example, a 20% reduction in heating output if the system-related possibilities for the full heating output were not exhausted.
  • the switch-off temperature of 75 ° C is reached somewhat later than when the device is operated continuously. Then, however, the heating power can be switched over in such a way that stage 2 of the heating device is switched on during the counterclockwise rotation phase and stage 1 during the clockwise rotation phase. Overall, this leads to a somewhat lower average temperature during the third drying section III. If the third drying section ended depending on the temperature, this would of course take longer than in the aforementioned example. It is therefore recommended to adapt the partial heating control to the exhaust air temperatures that can be achieved. With a suitable design of the system, the control of the heating during the third drying section between stages 2 and 3 may be better suited.
  • the power control of the heating device can also be set up according to its partial powers, so that it is entirely possible to switch back and forth in the second drying section between the second and fourth, the second and third or the first and third stages. It can also prove to be advantageous to switch the heating outputs back and forth differently in the third drying section than in the example shown.
  • FIG. 3 The illustration of a drum dryer given in FIG. 3 allows a view through its individual assemblies.
  • a horizontally mounted laundry drum 1 is connected to an exhaust air duct 3 at its loading opening 2.
  • This conducts the exhaust air discharged from the drum, for example through a condensate separator 4 (not shown in more detail) to the central inlet of a blower housing 5, the tangential outlet (not recognizable here) opening into a process air duct 7 equipped with radiators 6.
  • This is in turn connected to the rear entrance opening 8 of the laundry drum 1.
  • An exhaust air temperature sensor 9 in the exhaust air duct 3 and a heating temperature sensor 10 in the process air duct 7 are used to control the heater 6.
  • the laundry drum 1 can be driven via a belt 11 by an electric motor 12 which can be reversed in the direction of rotation, the shaft of which is also connected in a rotationally fixed manner to the impeller 13.
  • the circuit arrangement shown in FIG. 4 clarifies the division of the heating device 6 into individual heating windings 16, 17 and 18.
  • the drive motor 12 is connected in the usual way with a phase-rotating capacitor 19 and a reversing contact 20 of a reversing sensor 21 so that the direction of rotation can be reversed.
  • a switch 22 which can be operated by hand, the reversal of the direction of rotation can be switched ineffective by short-circuiting the phase rotating capacitor 19.
  • the short circuit can in turn be canceled by means of a switch 23 which is controlled by a temperature sensor 24.
  • the switch 22 which can be actuated by hand can initially be designed to be lockable in its working position.
  • the temperature transmitter 24 can, for example, be set to 60 ° in order to define the switching point which denotes the end of the first drying section 1 in FIG. 2.
  • This temperature sensor 24 has a further switch 25, which can short-circuit one of the heating resistors, namely the heating resistor 16, below 60 ° C.
  • the short-circuit circuit for the heating resistor 16 is therefore switched, so that the full voltage between the lines 27 and 28 acts once on the heating resistor 17 and, in parallel, via the program switch 31 on the heating resistor 18.
  • the heater is designed so that 17 and 18 3000 W heating power are switched when these two heating resistors are operated in parallel.
  • the temperature sensor 24 opens the short-circuit circuit for the heating resistor 16 with its switch 25, so that the resistors 16 and 17 are now in series with voltage and together have a smaller output submit. Thereby the total power output is reduced to 2500 W.
  • this only happens in the clockwise rotation phase, because in this phase a switch 26 of the reversing mechanism 21 is open.
  • the heating device should deliver the full heating power of 3000 W.
  • the reversing mechanism switch 26 is therefore only closed in the counterclockwise rotation phase. This corresponds to the program sequence corresponding to the dash-dotted diagram line in sections II and III in FIG. 2.
  • timing control unit 29 This includes switch 30, which can disconnect the entire heating device from the voltage. This is necessary in the fourth section, for example. Furthermore, the switch 31 of the time control unit can limit the heat output to resistors 16 and 17, which have a power of 1300 W in series connection. If the heating resistor 16 is bridged in this circuit by the reversing switch 26 or the temperature switch 25, then a power output of 1800 W results for the resistor 17, which is connected to voltage alone. As a result, a total of 4 heating stages can be defined, so that corresponding to that in FIG The dash-dotted line shown embodiment in the third drying section III, the heating device between the temperature levels 1 and 2, namely between 1300 and 1800 W, can be switched back and forth.
  • the time control unit 29 can be designed for pure time control or contain status-dependent control phases by means of so-called temperature waiting steps.
  • a temperature waiting step is, for example, 75 minutes. in the diagram in FIG. 2. It could also be 83 min. be installed to define the end of the third drying section by temperature control.
  • the temperature sensor 10 in the process air duct 7 (FIG. 3) is a double switch in the circuit of the heating device. It is used, for example, to prevent the process air from overheating if the blower fails by switching off the heating device at both poles.
  • FIG. 5 A somewhat simpler embodiment of the heating device is shown in FIG. 5 as an extract from a circuit arrangement according to FIG. 4, the two heating resistors 32 and contains 33. They can be switched in three heating stages by toggle switches 34 and 35 of the time control unit and / or of the reversing unit and / or of temperature sensors. In the position of the switch shown, only the heating resistor 32 is connected to voltage, after changing the switch 34, only the heating resistor 33 is connected to the voltage. If, instead of the switch 34, the switch 35 is changed from the position shown, both heating resistors 32 and 33 are connected in series to the voltage. It is the task of the circuit technician to determine the heating resistors 32 and 33 in such a way that there are reasonably uniform distances between the power values for the different circuit types. This means that three heating levels can be switched. If another simple switch is used, even four heating levels can be switched; then both heating resistors 32 and 33 can be connected to voltage in parallel.

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

Claims (9)

  1. Procédé de séchage de pièces de linge dans un sèche-linge à tambour, dans lequel le linge est brassé par rotation du tambour à linge qui est entraîné en rotation conjointement avec une soufflante d'air de séchage, dans le même sens ou alternativement dans les deux sens et est balayé par l'air de séchage chauffé, la puissance de chauffage étant diminuée lorsque la soufflante tourne dans un sens (mauvais), dans lequel le débit d'air est plus faible que dans l'autre sens de rotation (bon), procédé caractérisé par le fait qu'un cycle complet de séchage comprend au moins trois séquences (I à III) pour une même charge de linge, laquelle la charge de linge est brassée, exclusivement dans un sens de rotation (l) dans lequel la soufflante délivre le plein débit d'air au cours de la première séquence de séchage (I), exclusivement alternativement dans les deux de rotation (l, r) au cours de la deuxième séquence de séchage (II) qui commence lorsque l'air rejeté atteint une température proche de la température de séchage prédéterminée et exclusivement alternativement dans les deux sens de rotation (l, r) au cours de la troisième séquence de séchage (III) qui commence lorsque l'humidité résiduelle du linge est de 30 % maximum.
  2. Procédé de séchage de pièces de linge dans un sèche-linge à tambour selon le préambule de la revendication 1, caractérisé par le fait qu'un cycle complet de séchage comprend au moins trois séquences (I à III pour une même charge de linge, laquelle la charge de linge est brassée, exclusivement dans un sens de rotation (l), dans lequel la soufflante délivre le plein débit d'air au cours de la première séquence de séchage (I) selon le choix de l'utilisateur, exclusivement alternativement dans les deux sens de rotation (l, r) ou seulement dans un sens de rotation (l) dans lequel la soufflante délivre le plein débit d'air, au cours de la deuxième séquence de séchage (II) qui commence lorsque l'air rejeté atteint pour la première fois une température proche de la température de séchage prédéterminée et exclusivement alternativement dans les deux sens de rotation (l, r) au cours de la troisième séquence de séchage (II) qui commence lorsque l'humidité résiduelle du linge est de 30 % maximum.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que la puissance de chauffage réduite au cours de la deuxième séquence de séchage (II), pendant la rotation de la soufflante dans le sens (r) correspondant au débit d'air réduit est calculée de telle sorte que la température de l'air de séchage ne dépasse que faiblement 60°C.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que, au cours de la troisième séquence de séchage (III), l'air de séchage, pendant la rotation de la soufflante dans le sens (l) correspondant au plein débit d'air, est chauffé avec une puissance réduite et, pendant la rotation de la soufflante dans le sens (r) correspondant au débit d'air réduit est chauffé avec une puissance encore plus faible..
  5. Procédé selon la revendication 4, caractérisé par le fait que la puissance encore plus faible est égale à zéro.
  6. Sèche-linge à tambour pour la mise en oeuvre du procédé selon l'une des revendications 1 à 5, dont le tambour peut fonctionner dans les deux sens et est couplé côté entraînement à une soufflante d'air de séchage qui, avec un dispositif de chauffage, est disposée dans un conduit d'air de séchage, comportant un dispositif de commutation qui commande le dispositif de chauffage et un capteur de température qui déclenche un processus de commutation dès qu'une température prédéterminée et atteinte, caractérisé par le fait que le capteur de température (24) est agencé pour mesurer la température de l'air rejeté et déclenche le processus de commutation du point de vue des éléments qui déterminent le sens de rotation pour les deuxième et troisième séquences de séchage (II et III) dès que la température de l'air rejeté approche d'une température de séchage prédéterminée (par exemple 60° C) et par le fait que le dispositif de commutation (24, 23) est en outre agencé pour commander le passage du dispositif d'entraînement (12) du tambour à linge (12) du mode de fonctionnement continu en mode de fonctionnement alternatif et inversement.
  7. Sèche-linge à tambour selon la revendication 6, caractérisé par le fait que le dispositif de commutation (23 et 25) peut être actionné automatiquement par un dispositif de mesure dès que celui-ci détecte une humidité résiduelle du linge de 30 % maximum et met fin à la deuxième séquence de séchage (II).
  8. Sèche-linge à tambour selon la revendication 6 ou 7, caractérisé par le fait qu'il est prévu un commutateur (22) qui peut être actionné manuellement et au moyen duquel le dispositif d'entraînement du tambour à linge (12) peut être amené du mode de fonctionnement alterné en mode de fonctionnement continu et qui peut être rappelé par le dispositif de commutation (23 à 25) et par le fait que, lors de l'actionnement du commutateur (22) le dispositif de chauffage (6) peut être commuté sur la puissance de chauffage élevée, tandis que lors du déclenchement du dispositif de commutation (23 à 25), au moins pendant le fonctionnement de la soufflante dans le sens de rotation (r) correspondant au débit d'air réduit le dispositif peut être commuté sur une puissance de chauffage réduite.
  9. Sèche-linge à tambour selon la revendication 6 ou 7, caractérisé par le fait que le dispositif de chauffage (6) peut être commuté par le système d'inversion du sens de rotation (21) sur la puissance élevée lorsque la soufflante (5) travaille dans le sens de rotation (l) correspondant à un débit d'air élevé et sur la puissance réduite lorsque la soufflante (5) travaille dans le sens de rotation (r) correspondant à un débit d'air réduit.
EP89108833A 1988-06-20 1989-05-17 Procédé pour le séchage de pièces de linge Expired - Lifetime EP0358849B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89108833T ATE97706T1 (de) 1988-06-20 1989-05-17 Verfahren zum trocknen von waeschestuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3820815A DE3820815A1 (de) 1988-06-20 1988-06-20 Verfahren zum trocknen von waeschestuecken in einem trommeltrockner und hierzu geeigneter trommeltrockner
DE3820815 1988-06-20

Publications (3)

Publication Number Publication Date
EP0358849A2 EP0358849A2 (fr) 1990-03-21
EP0358849A3 EP0358849A3 (en) 1990-04-11
EP0358849B1 true EP0358849B1 (fr) 1993-11-24

Family

ID=6356859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108833A Expired - Lifetime EP0358849B1 (fr) 1988-06-20 1989-05-17 Procédé pour le séchage de pièces de linge

Country Status (4)

Country Link
EP (1) EP0358849B1 (fr)
AT (1) ATE97706T1 (fr)
DE (2) DE3820815A1 (fr)
HK (1) HK91295A (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE19539155C1 (de) * 1995-10-20 1997-01-23 Bauknecht Hausgeraete Verfahren zum Trocknen von Wäschestücken in einem Trommel-Wäschetrockner

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DE4032079C2 (de) * 1990-10-10 1999-03-04 Aeg Hausgeraete Gmbh Verfahren zum Trocknen von Wäsche in einem programmgesteuerten Trommeltrockner
DE4138440A1 (de) * 1991-11-22 1993-05-27 Licentia Gmbh Haushalt-waeschetrockner
FR2770631B1 (fr) * 1997-11-05 2000-02-11 Esswein Sa Procede d'optimisation de la consommation d'energie d'une machine de sechage par courant d'air de produits ou materiaux disposes dans une enceinte
DE102004043068A1 (de) * 2004-09-06 2006-03-23 BSH Bosch und Siemens Hausgeräte GmbH Steuerverfahren für einen Elektromotor und Antriebsaggregat zur Ausführung des Verfahrens
EP2025800B1 (fr) 2007-08-17 2016-04-13 Electrolux Home Products Corporation N.V. Appareil ménager électrique
KR20120080947A (ko) 2011-01-10 2012-07-18 엘지전자 주식회사 의류처리장치의 운전방법
EP2487291B1 (fr) 2011-02-11 2015-07-01 Electrolux Home Products Corporation N.V. Sèche-linge à tambour rotatif et procédé de contrôle d'un sèche-linge à tambour rotatif pour sécher le linge délicat
EP2392725A3 (fr) * 2011-09-12 2012-04-25 V-Zug AG Sèche-linge doté d'un fonctionnement de renversement

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Also Published As

Publication number Publication date
HK91295A (en) 1995-06-16
DE58906244D1 (de) 1994-01-05
EP0358849A3 (en) 1990-04-11
EP0358849A2 (fr) 1990-03-21
DE3820815A1 (de) 1989-12-21
ATE97706T1 (de) 1993-12-15

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