EP3246454B1 - Tumble dryer - Google Patents

Description

The invention relates to a tumble dryer according to the preamble of patent claim 1 and a method for moistening laundry by means of such a tumble dryer according to the patent claim 8.

For drying laundry laundry dryers have long been used. Here, the wet laundry to be dried is placed by a user through an opening of the tumble dryer in the laundry drum and closed this opening. The laundry drum is then rotated so that the laundry can be moved around.

At the same time, hot process air is introduced into the laundry drum in the direction of the axis of rotation of the laundry drum rotation, which dries the laundry. The hot process air is supplied comparatively dry, so that they absorb moisture from the laundry and can carry out with him out of the laundry drum. In this way, the laundry can be dried.

Tumble dryers with steam smoothing or English steamfinishing are also available. The aim of this function is that the user can not remove the laundry completely dry but with a certain low residual moisture from the clothes dryer, so that the laundry, for example, the laundry. during the immediate subsequent ironing, it is easier to smooth and thus gentle.

For this it is known, for example, that the laundry in the tumble dryer is first completely dried. Then, in an additional step, water is sprayed from a nozzle onto the dry laundry. For this, e.g. By means of a pump, spray water is removed from the condensation container of the tumble dryer in order to avoid having to use additional water. However, since the sprayed water can not or hardly evaporate due to the relatively low temperature of the laundry, this is more a moistening of the laundry by spraying than by vapor deposition.

From the EP 1 507 033 A1 is a washing machine known which can produce water vapor. For this purpose, water is passed into a steam device inside the housing of the washing machine. In the steam device is a plate which can be heated by induction from a surrounding coil. The water evaporates on the plate and is then treated as water vapor via a nozzle in the interior of the Laundry drum initiated. Thus, the laundry to be washed can be moistened by steam.

The disadvantage here is that to generate the steam a considerable effort through hoses, must be driven by the steam device and electrical leads of the coil. This not only causes additional costs but also requires additional space.

From the US 2009/0272004 A1 a clothes dryer according to the preamble of claim 1 is known in which the laundry drum is heated by a heated by means of heating process air stream. The clothes dryer is further provided with a liquid discharge unit directed to the upper portion of the laundry drum, which is formed as a spray unit and arranged to spray a liquid on the inside of the laundry drum (15). A similar tumble dryer is out of the US 5,396,715 A known.

In addition, from the EP 2400052 A1 a washer-dryer in which an induction heating system is used for heating washing liquid and process air. The tub of the washer dryer has a heating coil of conductive material, which is arranged on the lateral surface of the tub. The heating coil is electrically contacted and supplied from the outside in such a way that the heating coil can generate an electromagnetic field which acts on the rotatably mounted drum arranged in the interior of the tub and can heat it inductively.

The present invention thus presents the problem of providing a clothes dryer described above, which can provide the possibility of a function "steam smoothing" in a simpler manner than previously known. At least an alternative to known clothes dryers should be created with this feature.

According to the invention this problem is solved by a tumble dryer with the features of claim 1 and by a method having the features of claim 8. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

The present invention thus relates to a clothes dryer with a laundry drum for receiving laundry to be dried and at least one heating unit, which is designed and arranged to heat the laundry drum and a directed to the upper portion of the laundry drum liquid dispensing unit, which is designed as a spray unit and is arranged to spray a liquid on the inside of the laundry drum. By this is meant that the heating unit can act directly on the laundry drum to heat or heat them. The heat drum can then in turn, heat and dry the laundry that has absorbed it. Also, the air inside the laundry drum can be heated by the laundry drum. Additional or alternatively usable possibilities for heating and drying the laundry in the laundry drum are not excluded thereby.

Preferably, the liquid is water, which is preferably at least partially the condensation of moisture removed by the current or previous drying process of the laundry in the laundry drum. As a result, the use of additional water can be dispensed with, which can increase the environmental friendliness of the present invention.

The present invention is based on the idea that, in the case of a tumble dryer whose laundry drying takes place at least partially via heating of the laundry drum, the heating or heating of the laundry drum can also be used to generate steam, if e.g. is to be enabled as a function "steam smoothing" or "steam finish". Thus, by means of the contactless heating unit only a correspondingly high temperature of e.g. about 90 ° C and then a liquid such. Dispensing water to the laundry drum to achieve evaporation of the liquid on the laundry drum. In this way, steam can be generated within the laundry drum, so that the laundry can be moistened with steam. This can be done with water vapor instead of water spray. By using steam, a better smoothing of the laundry can be achieved than with the moistening of the laundry by the spraying with liquid.

It is advantageous in this case that no other technical components are required for steam generation to bring the moisture to evaporate. Thus, steam can be generated without much technical effort.

It is also advantageous that in tumble dryers, which already have the possibility of dispensing liquid on the laundry within the laundry drum, as described above, only the already existing liquid dispensing unit in the direction and, if necessary. In the strength of the delivery of the liquid is changed in that the liquid is dispensed onto the laundry drum instead of the laundry. Preferably, the liquid dispensing unit is to be directed to the upper region of the laundry drum, since this is usually laundry-free. This can be done with existing liquid dispensing units, for example via an adapter, which deflects the direction of the liquid delivery and, if necessary, the pressure increases here. In this way, an implementation of the present invention in existing clothes dryers of this type can be done easily and quickly, without that for the production of inventive dryer new Tumble dryer must be made. Also, the position of the liquid dispensing unit may be. For this purpose be maintained.

The liquid dispensing unit is designed as a spray unit, so that the liquid can be sprayed onto the laundry drum. By spraying, the liquid can be separated into smaller to finer drops to a mist instead of a jet or instead of larger drops. The comparatively small amounts of liquid can reach a larger surface of the laundry drum and be evaporated faster or even completely, so that a more efficient and faster steam generation can be achieved.

The liquid dispensing unit is configured and arranged to deliver the liquid to the inside of the laundry drum. As a result, the steam generation can be done closer to the laundry, so that the laundry can be moistened faster with steam. Also, in this way, a higher proportion of the generated steam can be taken up by the laundry instead of condensing again on other surfaces within the laundry drum.

According to the invention, the contactless heating unit is arranged fixed radially outside the laundry drum. In this case, the non-contact heating unit can be arranged, for example, at a radial distance from the laundry drum of preferably up to 2.5 cm in order to maintain a sufficient distance, so that even during operation safe touches can be avoided, but at the same time can be done an efficient heating of the laundry drum. The fixed arrangement of the contactless heating unit, a simple electrical supply can be achieved. Furthermore, a secure and permanently durable positioning and alignment with respect to the rotatable laundry drum can be achieved.

According to the invention, the non-contact heating unit is an induction heating unit. This may comprise a coil or a plurality of coils, which may be supplied with a high-frequency alternating current or may cause inductive heating by means of a primary magnetic field in the radially outer layer of the material of the laundry drum. The laundry drum is for this purpose preferably formed from a ferromagnetic material or has at least partially on a ferromagnetic material.

It is advantageous here that the use of inductive heating in washing machines and dryers is basically known and tested in practice, so that a safe technique can be used here. This can lead to a high level of customer acceptance for this type of additional heating.

It is also advantageous that the heating effect on ferromagnetic materials in the vicinity of the induction heating unit can be limited, so that unwanted effects on other elements within the tumble dryer can be avoided.

According to the invention, the contactless heating unit and the liquid dispensing unit are arranged offset to one another in the circumferential direction of the laundry drum. In this way, the laundry drum can first be heated by the heating unit before the liquid is dispensed onto the laundry drum. This allows evaporation of the liquid at higher temperatures. For this purpose, the liquid dispensing unit is preferably arranged downstream of the heating unit in the direction of rotation of the laundry drum.

The contactless heating unit may e.g. be placed in the top of one of the corners of the housing of the clothes dryer, where usually next to the cylindrical laundry drum is sufficient space for an additional non-contact heating unit. Furthermore, a sufficient distance to the low-lying region of the laundry drum can be taken in this way, so that the laundry, which can preferably accumulate down in the laundry drum, can be protected by the contactless heating unit before heating the laundry drum.

According to a further aspect of the present invention, the contactless heating unit is designed to be operated with a heating power as a function of the quantity of liquid discharged from the liquid dispensing unit onto the laundry drum, or vice versa. In this way, a control or regulation of the steam generation can be carried out by the temperature of the laundry drum can be adjusted by adjusting the heating power to the amount of liquid dispensed thereon. This can be achieved on the one hand, that the maximum possible amount of steam can be generated in order to accelerate this. At the same time it can be ensured that the discharged liquid can also be completely evaporated by the laundry drum in order to avoid wetting of the laundry by excess non-evaporated liquid.

According to a further aspect of the present invention, the contactless heating unit is designed to be operated with a heating power as a function of the speed of the laundry drum, or vice versa. In this way, the heating power can be optimized by, for example, ensures that the highest possible speed of the laundry drum drove, but this is below the response speed. simultaneously the temperature of the laundry drum can be set as high as possible in order to achieve the highest possible heat conduction. Furthermore, the temperature of the laundry drum is kept low enough not to damage the items to be dried laundry. In this case, the temperature of the laundry drum via the contactless heating unit can be adapted to these requirements in order to achieve an optimum result. Therefore, the speed of the laundry drum decreases, so the performance of the contactless heating unit can be adjusted. In this case, the delivery of the liquid to the laundry drum can also be taken into account, as described above.

According to another aspect of the present invention, the clothes dryer further comprises a temperature sensor that is configured and arranged to detect a temperature of the laundry drum. As a result, a temperature detection of the laundry drum can take place in order, for example, to only to dispense liquid onto the laundry drum when and / or as long as the laundry drum is at a temperature of e.g. at least about 90 ° C, which can lead to an effective evaporation of the liquid. The required detection of the temperature of the laundry drum can be done via a temperature sensor.

The temperature sensor is preferably to be arranged at a location above the laundry drum or in the upper region of the space of the laundry drum, so that the temperature detection of the laundry drum can be made there, where usually no laundry is applied to the inside of the laundry drum, as this could falsify the measurement result. Furthermore, the contactless heating unit is usually arranged in this area of the tumble dryer, so that the laundry can not be overheated and damaged by the contactless heating unit if the laundry drum comes to a standstill during operation of the contactless heating unit at least for a short time. It can also be achieved hereby that the temperature sensor can detect the temperature of the laundry drum as directly as possible when this region of the laundry drum has passed the contactless heating unit and thus has its maximum temperature of the current revolution of the laundry drum.

According to a further aspect of the present invention, the temperature sensor is arranged fixed radially outside the laundry drum. This can simplify the electrical supply of the temperature sensor and signal transmission away from the temperature sensor and make safer. This can also be cheaper than a temperature sensor that would move with the laundry drum. Furthermore, a relative to the rotating laundry drum fixedly arranged temperature sensor can detect him passing rotating laundry drum over its entire circumference.

In accordance with another aspect of the present invention, the clothes dryer further includes a humidity sensor configured and arranged to detect moisture within the laundry drum. In this way, this measurand can also be detected, e.g. to control or regulate the use of evaporation at all or the amount of steam generated depending on the humidity within the laundry drum.

According to another aspect of the present invention, the humidity sensor is disposed radially outwardly of the laundry drum. This can simplify the electrical supply of the moisture sensor and the signal transmission away from the moisture sensor and make it safer. This can also be cheaper than a moisture sensor that would move with the laundry drum.

• Starten der Drehung der Wäschetrommel,
• zeitlich hiernach, Starten der kontaktlosen Erhitzung der Wäschetrommel, und
• Starten der Abgabe einer Flüssigkeit auf die Wäschetrommel.

The present invention also relates to a method for moistening laundry by means of a tumble dryer as described above with the steps:

• Starting the rotation of the laundry drum,
• time thereafter, starting the contactless heating of the laundry drum, and
• Start dispensing a liquid onto the laundry drum.

In this way, a previously described inventive generation of steam within a tumble dryer can be implemented as a method.

According to one aspect of the present invention, after starting the non-contact heating of the laundry drum, the temperature of the laundry drum is detected and the delivery of the liquid to the laundry drum is not started until a predetermined temperature of the laundry drum is reached. This temperature may e.g. at about 90 ° C, since from this temperature effective and rapid evaporation of the liquid can be achieved. In this way it can be ensured that the delivery of liquid to the laundry drum takes place only when the fastest possible and complete evaporation of the liquid due to the sufficient heating of the laundry drum can also be ensured. This can also ensure that the laundry is not moistened by non-evaporated liquid.

• Beenden der Abgabe der Flüssigkeit auf die Wäschetrommel
  • ∘ in Abhängigkeit einer Zeitdauer seit dem Starten der Abgabe der Flüssigkeit auf die Wäschetrommel, und bzw. oder
  • ∘ in Abhängigkeit einer Anzahl von Umdrehungen der Wäschetrommel seit dem Starten der Abgabe der Flüssigkeit auf die Wäschetrommel, und bzw. oder
  • ∘ in Abhängigkeit der abgegebenen Menge der Flüssigkeit auf die Wäschetrommel, und bzw. oder
  • ∘ in Abhängigkeit des Unterschreitens einer vorbestimmten Temperatur der Wäschetrommel durch eine erfasste Temperatur, und bzw. oder
  • ∘ in Abhängigkeit des Erreichens einer vorbestimmten Feuchtigkeit innerhalb der Wäschetrommel durch eine erfasste Feuchtigkeit.

According to another aspect of the present invention, the method further comprises the subsequent step or steps:

• Stop dispensing the liquid onto the laundry drum
  • ∘ depending on a time since the start of the delivery of the liquid to the laundry drum, and / or or
  • ∘ in response to a number of revolutions of the laundry drum since the start of the delivery of the liquid to the laundry drum, and or or or
  • ∘ depending on the amount of liquid dispensed onto the laundry drum, and / or or
  • ∘ as a function of falling below a predetermined temperature of the laundry drum by a detected temperature, and / or or
  • ∘ in response to reaching a predetermined humidity within the laundry drum by a detected moisture.

By fulfilling one of the o.g. Conditions or more of the above. Conditions, the delivery of the liquid to the laundry drum and thus the steam generation can be stopped. This may be the case after a predetermined period of time, but also after a predetermined number of revolutions, after a predetermined amount of the dispensed liquid, falling below a predetermined lower limit temperature of the laundry drum and / or upon reaching a predetermined moisture level within the laundry drum. In this case, the abovementioned predetermined values can be fixed or can also be determined as a function of one another or of other further variables. For example, the period of time after which the discharge of the liquid to the laundry drum is stopped, depending on e.g. the detected temperature of the laundry drum are determined.

Figur 1

eine perspektivische schematische Darstellung eines erfindungsgemäßen Wäschetrockners;

Figur 2

die Darstellung der Figur 1 im Schnitt von oben;

Figur 3

die Darstellung der Figur 1 im Teilschnitt von vorne;

Figur 4

die Darstellung der Figur 1 im Schnitt von der linken Seite;

Figur 5

einen Ausschnitt der Darstellung der Figur 4; und

Figur 6

eine schematische seitliche Prinzipdarstellung des erfindungsgemäßen Wäschetrockners.

An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. It shows

FIG. 1

a perspective schematic view of a laundry dryer according to the invention;

FIG. 2

the representation of FIG. 1 in section from above;

FIG. 3

the representation of FIG. 1 in partial section from the front;

FIG. 4

the representation of FIG. 1 in section from the left side;

FIG. 5

a section of the representation of FIG. 4 ; and

FIG. 6

a schematic side schematic diagram of the laundry dryer according to the invention.

FIG. 1 shows a perspective schematic representation of a laundry dryer 1 according to the invention. FIG. 2 shows the representation of FIG. 1 in section from above. FIG. 3 shows the representation of FIG. 1 in partial section from the front. FIG. 4 shows the representation of FIG. 1 in the section from the left side. FIG. 5 shows a section B of the representation of FIG. 4 , The tumble dryer 1 extends at a height Z, at a depth X and at a width Y.

The tumble dryer 1 has a front 10, a right side 11, a left side 12, a back 13 and a top 14, wherein in the illustration of FIG. 1 and 3 the top 14 is omitted to make the interior of the clothes dryer 1 at least partially visible. Inside the tumble dryer 1, a cylindrical laundry drum 15 is arranged, which can rotate about an axis of rotation A. From the axis of rotation A, the radial direction R is pointing away (cf. Figures 2 and 4 ). The laundry drum 15 can be filled from the front side 10 of the tumble dryer 1 by a laundry drum door 16 with laundry 5 to be dried, which can then rest on the inner side 15a of the laundry drum 15 (cf. FIG. 6 ).

The tumble dryer 1 has a heat pump unit 3, which is arranged below the laundry drum 15 (see. FIG. 4 ). From the heat pump unit 3, heated process air can be introduced into the laundry drum 15 via a process air inlet 17 in order to dry the laundry located there (cf. Figures 3 and 4 ). The process air can then be returned to the heat pump unit 3 via a process air outlet 18 (cf. FIGS. 1 and 4 ).

The tumble dryer 1 also has a contactless heating unit 2, which is provided as an induction heating unit 2, each with two induction heating elements 20 in the form of induction coils 20. The laundry drum 15 is correspondingly formed from a ferromagnetic material. The induction heating unit 2 is arranged in the upper right corner of the interior of the clothes dryer 1, so that the space available there can be used. Further, the induction heating unit 2 is easily and quickly accessible at this position by removing the cover of the top 14 both during assembly and for maintenance or repair. Also, the induction heating unit 2 at this position is generally spaced far enough from the laundry not to overheat it by the laundry drum 15 in that area.

In this way, inductive heating of the laundry drum 15 by the induction heating unit 2 can take place. In order to supply the heat generated in this way to the induction heating unit 2 as completely as possible to the interior of the laundry drum 15, the laundry drum 15 has an insulation 19 radially on the outside, which is designed to be magnetically permeable and thermally insulating. This is intended to be achieved or favored that the heat generated inductively in the laundry drum 15 is not as possible dissipated to the outside but is used to heat the laundry to be dried by means of heat conduction.

In this way, the laundry drum 15 can be heated to dry the laundry applied thereto by means of heat conduction. Additionally or alternatively, the laundry can be dried as previously known by the process air of the heat pump unit 3. As a result, on the one hand, the drying time can be shortened. On the other hand, the efficiency of the tumble dryer 1 can be increased by an increased Enthalpiestrom. There are various combinations of the operation of the two heat sources, i. the induction heating unit 2 and the heat pump unit 3, possible to achieve the optimum result according to various criteria such as the shortest possible drying time, the lowest possible energy consumption, as gentle as possible drying for different types of laundry or moisture levels of the laundry.

According to the invention, the tumble dryer 1 also has a liquid dispensing unit 4 in the form of a spray unit 4, which can deliver water 40 as liquid 40 onto the inside 15a of the laundry drum 15 in a sprayed manner (cf. Figures 5 and 6 ). The spray unit 4 can also be referred to as a water nozzle 4. In this way, according to the invention, the inductively heated laundry drum 15 or its inner side 15a can be used to produce water vapor 41 for moistening the laundry if required by spraying the inside 15a of the heated laundry drum 15 with water 40 (cf. FIG. 6 ).

FIG. 6 shows a schematic side schematic diagram of the laundry dryer 1 according to the invention on the basis of this schematic representation of a flow of a steam generation according to the invention will now be explained in more detail:
As in the presentation of FIG. 6 shown, the inventive laundry dryer 1 according to the present embodiment further comprises a temperature sensor 42 which is disposed above the laundry drum 1 about its highest point and preferably approximately centrally in the depth Y. The temperature sensor 42 is aligned with the outer surface of the laundry drum 15 to detect its temperature value.

Further, in the immediate vicinity of the temperature sensor 42, a humidity sensor 43 is arranged to detect a value of the humidity within the laundry drum 15. However, the humidity sensor 43 may also be located in the depth Y adjacent to the temperature sensor 42, or e.g. on a vertical surface, e.g. above the process air inlet 17 of the laundry drum 15, if there is easier and / or more accurate to capture the moisture value.

The laundry drum 15 can move in operation in its circumferential direction U in two directions. In the presentation of the FIG. 6 a rotation of the laundry drum 15 takes place about the rotation axis A in a counterclockwise direction in a direction of rotation V. This is a relatively low rotational speed in the range greater than 0 and less than 90 revolutions per minute, preferably greater than 0 and less than 50 revolutions per minute, chosen so that the laundry 5 is only slightly taken from the lowest point of the laundry drum 15 by the rotational movement, but then again falls back to the lowest point of the laundry drum 15. In this way it can be ensured that the laundry 5 maintains a sufficient distance to the induction heating unit 2 and the inductively heated area of the laundry drum 15 despite rotation of the laundry drum 15.

The induction heating unit 2 is now operated with such a high power that the moving past regions of the laundry drum 15 are heated by induction. In this case, the degree of heating is detected by the temperature sensor 42 arranged downstream in the direction of rotation V, so that on the one hand overheating of the laundry drum 15 can be avoided by timely limiting the power of the induction heating unit 2. On the other hand, the spraying of the inside 15a of the laundry drum 15 can be started as soon as it is detected by the temperature sensor 42 that the laundry drum 15 is at a temperature of e.g. has reached at least 90 ° C. Then, water 40 is sprayed from the water nozzle 4 onto the inside 15a of the laundry drum 15, which evaporates to water vapor 41 as vaporized liquid 41.

The spraying is terminated after a full rotation of the laundry drum 15 so that the generated water vapor 41 can be absorbed by the laundry 5. Furthermore, the laundry drum 15 has cooled by the evaporation of the water 40, so that the laundry drum 15 must first be inductively heated to about 90 ° C before again an effective evaporation can be made.

This water vapor 41 can moisten the laundry 5, so that a function "steam smoothing" or "steam finish" can be implemented and provided by means of water vapor 41 in a simple manner.

Alternatively, the spraying could be terminated as soon as a temperature of e.g. 80 ° C below, since below this temperature evaporation can not be made so effective that not at least partially humidification of the laundry 5 can be excluded directly by the water 40.

Alternatively, the spraying could also be stopped once a predetermined amount of water, e.g. between 0.1 liter and 1.2 liters was sprayed onto the inside 15a of the laundry drum 15.

Alternatively, the spraying could be terminated as soon as a predetermined target residual moisture within the laundry drum 15 was reached.

List of Reference Numerals (part of the description)

A

Rotation axis of the laundry drum 15th

B

Detail of the FIG. 4

R

radial direction

U

circumferentially

V

Direction of rotation of the laundry drum 15

X

Longitudinal direction; depth

Y

Transverse direction; width

Z

height

1

clothes dryer

10

front

11

right side

12

left side

13

back

14

top

15

washing drum

15a

Inner side or inner surface of the laundry drum 15

16

Washing drum door

17

Process air inlet of the laundry drum 15

18

Process air outlet of the laundry drum 15

19

External insulation of the laundry drum 15th

2

contactless heating unit; induction heating; Infrared heating unit

20

Induction heating elements; inductors

3

heat pump unit

4

Liquid dispensing unit; spray; (Water) nozzle

40

Liquid; water

41

evaporated liquid; Steam

42

temperature sensor

43

humidity sensor

5

Laundry

Claims (10)

1. Tumble dryer (1) comprising a laundry drum (15) for receiving laundry (5) to be dried, and at least one heating unit (2) which is designed and arranged so as to heat the laundry drum (15), and a liquid dispensing unit (4) which is oriented towards the upper region of the laundry drum (15), is designed as a spray unit (4) and is arranged so as to spray a liquid (40) onto the inner face (15a) of the laundry drum (15), characterised in that the heating unit (2) is stationarily arranged radially outside the laundry drum (15) as a contactless heating unit (2) and is designed as an induction heating unit (2), the contactless heating unit (2) and the liquid dispensing unit (4) being arranged so as to be offset from one another in the circumferential direction (U) of the laundry drum (15), the liquid dispensing unit (4) being arranged downstream of the heating unit (2) in the direction of rotation V of the laundry drum (15).
2. Tumble dryer (1) according to claim 1, wherein the contactless heating unit (2) is designed to be operated with a heating power based on the amount of liquid dispensed from the liquid dispensing unit (4) to the laundry drum (15), or vice versa.
3. Tumble dryer (1) according to either claim 1 or claim 2, wherein the contactless heating unit (2) is designed to be operated with a heating power based on the rotational speed of the laundry drum (15), or vice versa.
4. Tumble dryer (1) according to any of the preceding claims, further comprising a temperature sensor (42) which is designed and arranged so as to detect a temperature of the laundry drum (15).
5. Tumble dryer (1) according to claim 4, wherein the temperature sensor (42) is stationarily arranged radially outside the laundry drum (15).
6. Tumble dryer (1) according to any of the preceding claims, further comprising a moisture sensor (43), which is designed and arranged so as to detect moisture inside the laundry drum (15).
7. Tumble dryer (1) according to claim 6, wherein the moisture sensor (43) is stationarily arranged radially outside the laundry drum (15).
8. Method for moistening laundry (5) by means of a tumble dryer (1) according to any of claims 1 to 7, comprising the steps of:
   starting the rotation of the laundry drum (15), then, temporally thereafter, starting the contactless heating of the laundry drum (15), and starting the dispensation of a liquid (40) to the laundry drum (15).
9. Method according to claim 8, wherein, after starting the contactless heating of the laundry drum (15), the temperature of the laundry drum (15) is detected and the dispensation of the liquid (40) to the laundry drum (15) is started only when a predetermined temperature of the laundry drum (15) is reached.
10. Method according to either claim 8 or claim 9, further comprising the subsequent step(s) of:

    ending the dispensation of the liquid (40) to the laundry drum (15) on the basis of a period of time since the dispensation of the liquid (40) to the laundry drum (15) was started, and/or

    on the basis of a number of revolutions of the laundry drum (15) since the dispensation of the liquid (40) to the laundry drum (15) was started, and/or

    on the basis of the amount of liquid (40) dispensed to the laundry drum (15), and/or

    on the basis of a detected temperature falling below a predetermined temperature of the laundry drum (15), and/or

    on the basis of a detected moisture reaching a predetermined moisture within the laundry drum (15).

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