EP3246454A1 - Tumble dryer - Google Patents

Abstract

The invention relates to a tumble dryer (1) with a laundry drum (15) for receiving laundry (5) to be dried and at least one contactless heating unit (2), which is designed and arranged to heat the laundry drum (15) without contact. The clothes dryer (1) is further characterized by a liquid dispensing unit (4) which is designed and arranged to deliver a liquid (40) to the laundry drum (15).

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 13.

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.

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 13. 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 contactless heating unit, which is designed and arranged to heat the laundry drum without contact. By this is meant that the heating unit can act directly on the laundry drum to heat or heat them. The heat drum can in turn heat the laundry that has absorbed it and thereby dry. 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.

The tumble dryer according to the invention is characterized by a liquid dispensing unit, which is designed and arranged to deliver a liquid to the laundry drum. Preferably, this 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 a tumble dryer whose drying takes place at least partially via a heating of the laundry drum, the heating or heating of the laundry drum can also be used to generate steam, if this, for example, as a function "steam smoothing" or "Steamfinish" should be enabled. Thus, by means of the contactless heating unit to set only a correspondingly high temperature of eg about 90 ° C and then deliver a liquid such as water on 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 dryers of this type can be done easily and quickly, without the need for the production of inventive dryer new clothes dryer must be made. Also, the position of the liquid dispensing unit may be. For this purpose be maintained.

According to one aspect of the present invention, the liquid dispensing unit is formed 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.

According to another aspect of the present invention, 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 can in this way one higher proportion of the generated steam are absorbed by the laundry instead of condensing on other surfaces within the laundry drum again.

According to another aspect of the present invention, the non-contact heating unit and the liquid discharging unit are offset from each other 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.

According to a further aspect of the present invention, the non-contact 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.

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 another aspect of the present 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 here is one safe technique can be applied. 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 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 e.g. it is ensured that the highest possible speed of the laundry drum driven, but this is below the contact speed. At the same time, 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. In this way, a temperature detection of the laundry drum can be done, for example, and only or as long as to deliver liquid to the laundry drum when the laundry drum has a temperature of eg at least about 90 ° C, which can lead to 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 abovementioned conditions or even more of the abovementioned conditions, the delivery of the liquid to the laundry drum and thus the steam generation can be ended. 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, when falling below a predetermined lower limit temperature of the laundry drum and / or upon reaching a predetermined Moisture value 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 the lapse of the dispensing of the liquid is stopped on the laundry drum, depending on eg the detected temperature of the laundry drum can be 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 again (see. 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 inside 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 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 It is necessary to produce water vapor 41 for moistening the laundry by spraying the inside 15a of the heated laundry drum 15 with water 40 (see also FIG FIG. 6 ).

• Wie in der Darstellung der Figur 6 gezeigt, weist der erfindungsgemäße Wäschetrockner 1 gemäß des vorliegenden Ausführungsbeispiels ferner einen Temperatursensor 42 auf, welcher oberhalb der Wäschetrommel 1 etwa über deren höchstem Punkt und vorzugsweise etwa mittig in der Tiefe Y angeordnet ist. Der Temperatursensor 42 ist zur äußeren Oberfläche der Wäschetrommel 15 hin ausgerichtet, um deren Temperaturwert zu erfassen.

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. Here, a comparatively 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, selected so that the laundry 5 is only slightly taken from the lowest point of the laundry drum 15 by the rotational movement, then However, 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 has reached a temperature of, for example, at least 90 ° C. Then it will be Water 40 is sprayed from the water nozzle 4 on the inside 15 a 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

circumferential direction

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 (15)

Clothes dryer (1), with
a laundry drum (15) for receiving laundry (5) to be dried, and at least one contactless heating unit (2) which is designed and arranged to heat the laundry drum (15) without contact,
marked by
a liquid dispensing unit (4) which is designed and arranged to deliver a liquid (40) to the laundry drum (15). Clothes dryer (1) according to claim 1,
wherein the liquid dispensing unit (4) is designed as a spray unit (4), so that the liquid (40) can be sprayed onto the laundry drum (15). Clothes dryer (1) according to claim 1 or 2,
wherein the liquid dispensing unit (4) is formed and arranged to deliver the liquid (40) to the inside (15a) of the laundry drum (15). Clothes dryer (1) according to one of the preceding claims,
wherein the non-contact heating unit (2) and the liquid discharge unit (4) are offset from one another in the circumferential direction (U) of the laundry drum (15). Clothes dryer (1) according to one of the preceding claims,
wherein the non-contact heating unit (2) is arranged fixed radially outside the laundry drum (15). Clothes dryer (1) according to one of the preceding claims,
wherein the non-contact heating unit (2) is an induction heating unit (2). Clothes dryer (1) according to one of the preceding claims,
wherein the non-contact heating unit (2) is adapted to be operated with a heating power in response to the amount of liquid discharged from the liquid discharging unit (4) to the laundry drum (15), or vice versa. Clothes dryer (1) according to one of the preceding claims,
wherein the contactless heating unit (2) is designed to be operated with a heating power as a function of the rotational speed of the laundry drum (15), or vice versa. Clothes dryer (1) according to one of the preceding claims, further comprising
a temperature sensor (42) which is designed and arranged to detect a temperature of the laundry drum (15). Laundry drier (1) according to claim 9,
wherein the temperature sensor (42) is arranged fixed radially outside the laundry drum (15). Clothes dryer (1) according to one of the preceding claims, further comprising
a humidity sensor (43) which is designed and arranged to detect a moisture within the laundry drum (15), Clothes dryer (1) according to claim 11,
wherein the humidity sensor (43) is arranged fixed radially outside the laundry drum (15). Method for moistening laundry (5) by means of a tumble dryer (1) according to one of claims 1 to 12, comprising the steps of: Starting the rotation of the laundry drum (15), time thereafter, starting the contactless heating of the laundry drum (15), and Starting the dispensing of a liquid (40) on the laundry drum (15). Method according to claim 13,
wherein after starting the contactless heating of the laundry drum (15), the temperature of the laundry drum (15) detected and the delivery of the liquid (40) on the laundry drum (15) is only started when a predetermined temperature of the laundry drum (15) is reached , The method of claim 13 or 14, further comprising the subsequent step (s): Terminating the delivery of the liquid (40) to the laundry drum (15) in response to a period of time since starting the delivery of the liquid (40) to the laundry drum (15), and / or as a function of a number of revolutions of the laundry drum (15) since starting the delivery of the liquid (40) to the laundry drum (15), and / or depending on the amount of liquid (40) delivered to the laundry drum (15), and / or in response to the falling below a predetermined temperature of the laundry drum (15) by a detected temperature, and / or in response to the reaching of a predetermined humidity within the laundry drum (15) by a detected humidity.

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