EP2388369A2 - Appareil de traitement du linge et procédé de fonctionnement d'un appareil de traitement du linge - Google Patents

Appareil de traitement du linge et procédé de fonctionnement d'un appareil de traitement du linge Download PDF

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Publication number
EP2388369A2
EP2388369A2 EP11165401A EP11165401A EP2388369A2 EP 2388369 A2 EP2388369 A2 EP 2388369A2 EP 11165401 A EP11165401 A EP 11165401A EP 11165401 A EP11165401 A EP 11165401A EP 2388369 A2 EP2388369 A2 EP 2388369A2
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EP
European Patent Office
Prior art keywords
laundry treatment
magnetic material
treatment appliance
process medium
curie
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.)
Withdrawn
Application number
EP11165401A
Other languages
German (de)
English (en)
Other versions
EP2388369A3 (fr
Inventor
Jürgen Dr. Hess
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2388369A2 publication Critical patent/EP2388369A2/fr
Publication of EP2388369A3 publication Critical patent/EP2388369A3/fr
Withdrawn legal-status Critical Current

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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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/04—Heating arrangements
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/262—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements made of plastic material, e.g. by injection moulding
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/22—Condition of the washing liquid, e.g. turbidity
    • D06F34/24—Liquid 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • 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
    • D06F2103/52—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to electric heating means, e.g. temperature 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
    • D06F2105/10—Temperature of washing liquids; Heating means therefor
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment

Definitions

  • the invention relates to a laundry treatment appliance, in particular a washing machine, tumble dryer or washer-dryer, with at least one heating device and a method for operating a laundry treatment appliance.
  • Previously known resistance heaters in laundry treatment appliances have, among other things, the following characteristics:
  • temperature-limiting elements eg fuses
  • Failed or blown fuses are always a service case.
  • control of the heating elements must be operated externally.
  • the necessary control electronics cause material costs.
  • the heating elements of the resistance heaters are also discrete components and must be laboriously mounted and tested. You also need a relatively large amount of space.
  • EP 0 418 807 A2 describes magnetic dispersions of ferrite particles with a high magnetic energy product in a flexible highly saturated nitrile rubber and method of making the same.
  • a flexible magnetic blend composition which consists of high energy magnetic ferrite particles in a flexible, highly temperature resistant and oil resistant polymer binder.
  • the system binder is high grade, usually from 55 to 65 volume percent charged with the ferrite particles, ie, barium and / or strontium ferrite particles which have bonded magnets with a maximum energy product of at least 1.0 Mega Gauss Oersted, a remanence Br of at least 2000 Gauss, a coercive force H0 of at least 1800 oersteds and an intrinsic coercive force Hci of at least 2000 oersteds.
  • the process for making this system involves mixing the binder system and the ferrite particles, with the ferrite particles being oriented in a preferred direction during processing and then brought to a final geometry before being cured by high voltage electron beam radiation, preferably with over 3 MeV.
  • Solid state electron beam hardening fixes the dimensional stability, magnetic properties, oil, solvent and chemical resistance of the part even when subsequently exposed to unfavorable temperature environments of 125 ° C or more. Any misfolded parts or cuttings that occur in the process prior to radiation curing can be recycled through repeated processing without the risk of premature curing.
  • US 5,329,085 describes a Curie point heater, primarily for use in a soldering iron and originally designed to operate with currents in the megahertz range, which is redesigned to operate in the kilohertz range. Further, in one embodiment of the heater, the coil that excites the heater is mounted in the handle of the piston.
  • US 5,182,427 describes a self-regulating heater provided by placing a ferrite body member, which is highly lossy when exposed to a high-frequency magnetic field, and a predetermined Curie temperature, on or around a center conductor connected to or configured with a power source to be connected, which provides the conductor with a high frequency alternating current is provided.
  • the current flowing through the center conductor creates a magnetic field around the conductor which causes the ferrite body to heat up to its Curie temperature due to internal losses.
  • the heater regulates itself at the Curie temperature of the ferrite body itself.
  • the power source is preferably an impedance-matched, constant current power source.
  • the ferrite body element may be ferromagnetic or ferrimagnetic.
  • the ferrite body is preferably ferrite magnetic, such as ferrite beads, rings and the like, which heat up due to hysteresis losses.
  • US 4,303,196 describes a temperature-sensitive valve in which the annular valve seat is made of a thermally sensitive magnetic material having a Curie temperature having a predetermined value.
  • a vertically movable valve plug is positioned below the valve seat and includes a permanent magnet which normally forces the plug up into the valve seat to close the valve, but which allows the valve to open when the temperature of the valve seat is at the Curie temperature exceeds.
  • US 4,414,519 describes a temperature-sensitive relay equipped with a compliant movable cantilever made of an amorphous ferromagnetic material having a Curie point.
  • the boom is adapted to carry a first contact element.
  • a second contact element is arranged adjacent to the first contact element for at least periodically establishing an electrical contact with the first contact element.
  • the relay is adapted to be connected to a circuit having a power source for providing an electrical current and a switching mechanism for activating the circuit in response to a preselected state.
  • a magnet is arranged and adapted to bias the cantilever to a first position which interrupts electrical continuity between the first and second contact elements.
  • the cantilever is converted from a ferromagnetic phase to a paramagnetic phase when its temperature exceeds the Curie point, whereby the cantilever assumes a second position in which electrical continuity is established.
  • a heating means is connected to the circuit and arranged in the vicinity of the boom for heating the boom to effect the transfer during a preselected period of time following the activation of the circuit.
  • DE 10 2008 044 280 A1 a water heater for a laundry treatment appliance.
  • This water heater is designed as an inductive heating device, which has a coil and at least one heating element with a ferromagnetic material for generating an alternating magnetic field, which can be heated by the alternating magnetic field.
  • the instantaneous water heater is controlled by means of a control device using a measured temperature of the medium to be heated.
  • a disadvantage of such a device is that means for detecting the temperature are required and the device is not intrinsically safe.
  • a laundry treatment device having at least one heating device for heating a process medium to a predetermined desired temperature, wherein the at least one heating device at least one magnetic (ie, ferromagnetic or ferrimagnetic) material or material volume having a predetermined Curie temperature (Tc), which corresponds to the desired temperature , and at least one alternating field generating means for generating an alternating magnetic field at the location of the at least one (ferro- or ferri-) magnetic material.
  • Tc Curie temperature
  • Ferromagnets and ferrimagnets are characterized by the so-called Curie temperature. Below this temperature ferromagnets absorb alternating magnetic fields, above this temperature they are inactive for the alternating fields. The absorption of alternating magnetic fields leads to heat generation. This property is particularly pronounced in hard magnetic materials. In technical application, this means that the magnetic material converts the energy of the alternating magnetic field into heat until the Curie temperature is reached. It follows that when applying a (sufficiently strong) alternating electromagnetic field, the ferromagnetic or ferrimagnetic (heating) material is kept at the Curie temperature Tc.
  • the heat generated by the magnetic material can be applied to a process medium of the laundry treatment appliance to be heated (eg lye, fresh water and / or process air) ("magnetic heating").
  • a process medium of the laundry treatment appliance eg lye, fresh water and / or process air
  • Ferromagnetic or ferrimagnetic materials are commercially available for a wide range of Curie temperatures Tc.
  • Such a laundry treatment appliance has, inter alia, the following advantages: it is possible to dispense with a temperature-limiting technique.
  • the heater is rather intrinsically safe, because a predetermined set temperature (which correspond to the Curie temperature or, taking into account heat losses, may be less than the Curie temperature Tc) is not exceeded. Damage even at temperatures around 100 ° C does not lead to destructive damage, such as spontaneous combustion, burning through or scaling.
  • the magnetic material may further be integrated directly into components or structures of the laundry treating appliance, e.g. in a pipe or a tub. This eliminates the need for discrete heating elements, so that a cost of assembly, sealing and wiring is eliminated, as well as related possible assembly errors.
  • This integration also eliminates the space previously required for the separate heating elements, while the alternating field generating means (e.g., a coil coupled to a frequency generator) can be made much more compact so that the laundry treating appliance is particularly compact and flexible in terms of design.
  • tools for making the components of the laundry treatment device may be simpler.
  • linting and / or calcification can at least be reduced.
  • the pocket in the tool can now be optimized, e.g. to a derivative of an accruing during a spin liquid.
  • the bag would generally simplify and reduce costs.
  • the laundry treatment device has exactly one heating device, for example with a field-generating means and one or more magnetically irradiated material volumes of the magnetic material.
  • the laundry treating appliance may have a plurality of such heaters whose magnetic material has a different Curie temperature Tc.
  • the process medium can be heated to different set temperatures.
  • These several heaters can be activated individually, for example, depending on a desired setpoint temperature, for example by means of a laundry treatment program.
  • the multiple heaters can also be activated in individual groups together.
  • the laundry treatment device has a washing function and the magnetic material is integrated into a tub.
  • the laundry treating appliance may e.g. a washing machine or a tumble dryer.
  • the integration into the tub can be dispensed with the space for the previously used separate resistance heating.
  • the alternating field generating means e.g. a coil, can be attached directly to the magnetic material-containing component, here: the tub.
  • the tub may e.g. a plastic surface which shields the magnetic material from the alkali so that the magnetic material does not corrode.
  • the tub can, for example, at the points that come into contact with the liquor, be made of plastic, in which the (ferromagnetic or ferri-) magnetic material (eg., Via a masterbatch) is fed.
  • Such a tub can be made e.g. by means of a two-shot injection molding process.
  • the (ferro-) or ferri-) magnetic material is present as part of a paint and is applied in particular at the points where a heat input is intended.
  • the magnetic material is integrated into a channel for process medium.
  • heating of the medium flowing through the channel can be carried out in a particularly compact manner.
  • a channel guide can be designed to be flexible.
  • the channel may be surrounded, for example, by a coil or winding at its portion surrounding the magnetic material (ie, the ferromagnetic or ferrimagnetic material having the predetermined and selected Curie temperature Tc), or may comprise a plurality of straight conductors passing through the magnetic material.
  • the tube can be, for example, a plastic tube into which the magnetic material is fed, for example via a masterbatch.
  • the (ferro- / ferri-) magnetic pipe section can, for example, act as a continuous flow heater or be such.
  • the channel has an internal structure comprising the magnetic material.
  • a heat transfer area between the magnetic material and the process medium can be increased.
  • the inner structure can be designed to be particularly complex and large-area.
  • the channel has at least one portion whose flow cross-section for the medium has a plurality of sub-channels whose walls have the magnetic material.
  • the number and flow area of the subchannels may be e.g. depending on the process medium (air, liquid (fresh water, lye)), the amount of heat to be transferred and / or the volumes to be heated are set.
  • the sub-channels have a honeycomb structure in cross-section. By this geometry, a very large thermal contact surface for a given flow cross-section can be obtained.
  • the laundry treating appliance has a laundry drying function (e.g., a clothes dryer or a washer dryer) and the process medium is air.
  • a laundry drying function e.g., a clothes dryer or a washer dryer
  • the laundry treating appliance has a washing function (e.g., a washing machine or a washer-dryer) and the process medium is (washing) liquor.
  • a washing function e.g., a washing machine or a washer-dryer
  • the process medium is (washing) liquor.
  • the magnetic material has ferrite.
  • Ferrites are inexpensive "mass chemicals” and can also be manufactured according to specifications (eg the Curie temperature and / or other magnetic parameters).
  • ferrites can be used in a "masterbatch", eg as in EP 0418 807 A2 described, are produced.
  • masterbatches can be processed by injection molding.
  • a ferrite exhibiting component of the laundry treatment appliance can thereby be produced very inexpensively, for example by means of a lacquer, by means of two-component injection molding or by means of a "two-shot technique" are injected into the component, especially where the application of heat is intended. This is especially the case if the shell of the component itself is injection-moldable.
  • the magnetic material comprises a NiFe alloy.
  • NiFe alloys are inexpensive and available for various suitable Curie temperatures and can be processed in the major mass production processes.
  • the invention is not limited to ferrites or NiFs, but may include any magnetic material having a Curie temperature.
  • the magnetic material is very complex moldable.
  • the magnetic material as the heat source can be integrated directly where the heat is to be introduced into the process medium, which mates a compact design with high design flexibility and enables effective heat transfer. Furthermore, a large heat contact surface can be realized, so that the process medium can be heated more quickly, which allows a faster temperature control of the process medium.
  • other manufacturing methods are possible, e.g. by an integration of foils, sheets, rods, moldings etc. or a use of a sintering process. Such components can be used by encapsulation technique or simply as inserted, glued, clamped and / or latched items.
  • the magnetic material is surrounded by an electrically insulating protective sheath, in particular plastic sheath.
  • the magnetic material can be irradiated without shielding the alternating magnetic field while at the same time providing a protective sheath or protective layer which protects against chemical and abrasive degradation.
  • the plastic sheath is well produced together with the magnetic material, for example by a two-component injection molding process or a use of masterbatches.
  • the application of heat to the place where it is needed can be made possible in particular by the two-shot process, wherein the magnetic substance is preferably introduced only where heat is intended later.
  • other manufacturing methods are possible, such as making a core of the magnetic material, for example by means of injection molding or sintering, and subsequent coating, for example by spraying, injection molding, painting, etc.
  • the alternating field generating means comprises at least one antenna which is electrically connected to a frequency generator.
  • the frequency generator can feed the antenna with an alternating current, which then emits the magnetic alternating field with at least substantially the same frequency.
  • the antenna may for example be a coil, e.g. is arranged outside of the magnetic material.
  • the antenna may alternatively be e.g. a straight, guided by the magnetic material conductor.
  • the frequency generator may be an AC voltage, e.g. in a range of kHz or MHz.
  • the antenna (without using a frequency generator) can be applied directly to a, possibly reduced amplitude, mains voltage signal.
  • a laundry treatment device having at least one heating device, in particular as described above, wherein the laundry treatment device has at least one Curie switch, which has a magnetic (ferromagnetic or ferrimagnetic) material having a predetermined Curie temperature, so that the Curie switch at or after reaching the Curie temperature of the magnetic material, wherein the magnetic material is in thermal communication with a process medium of the laundry treating appliance.
  • the Curie switch eliminates the need for a combination of temperature sensor and control. In other words, the Curie switch can simultaneously act as a sensor and as a controller or as a switching sensor. The Curie switch switches very precisely and with only small tolerances (eg unlike a bimetallic switch).
  • the laundry treatment device has a plurality of switches with different Curie temperatures, wherein the Curie temperatures is in the range of a possible target temperature of the process medium.
  • the Curie switch switches an associated heater for heating the process medium.
  • the heaters can be activated individually as a function of the target temperature to be reached or be switched on or off individually depending on the applied current temperature by the associated Curie switch. This allows an intrinsically safe heating can be achieved, which can be dispensed with a complex temperature sensing and control.
  • switches or switching devices are used specifically for a temperature control of selected washing programs.
  • the ferromagnetic or ferrimagnetic material is at least partially surrounded by the process medium to achieve a rapid response to a temperature change.
  • the (ferro- or ferri-) magnetic material is surrounded by an at least electrically insulating protective jacket, in particular made of plastic.
  • the magnetic material can be magnetically irradiated without shielding the alternating magnetic field while at the same time providing a protective sheath or protective layer which protects against chemical and abrasive degradation.
  • the plastic sheath is well producible together with the magnetic material, e.g. by a two-component injection molding process or two-shot process.
  • the Curie switch may e.g. be a valve or a relay.
  • At least one ferromagnetic or ferrimagnetic component which is in contact with the medium to be heated, as a temperature sensor.
  • the change in magnetizability occurring at the Curie temperature may be near but outside of the medium disarmed resonant circuit.
  • the signal generated from the detuning can be used, for example, to switch a heater.
  • a standing with the medium to be heated in thermal contact ferromagnetic or ferrimagnetic substance as a switching plunger of a relay or solenoid valve.
  • supply flows from heaters or a flow of wash liquor, fresh water or dryer air can be controlled.
  • the object is also achieved by a method for operating a laundry treatment appliance, wherein a ferromagnetic or ferrimagnetic material is irradiated by means of an alternating magnetic field, so that the ferromagnetic or ferrimagnetic material is heated to its Curie temperature Tc and its heat loss at least partially aufsammlungs to a desired temperature Process medium is transmitted, and / or a ferromagnetic or ferrimagneticians material turns on reaching its Curie temperature switch, which in turn switches at least one heating means of the laundry treatment device.
  • the invention thus comprises the use of a material having a predetermined Curie temperature Tc corresponding to the setpoint temperature of the process medium to be heated in a laundry treatment appliance, namely for the intrinsically safe switching off of heating means and / or for exact and simple temperature control when the Curie temperature Tc is reached.
  • Fig.1 shows a component of a laundry treatment device 1 in the form of a channel section 2 for passing a process medium M.
  • the channel section 2 has a tubular outer wall 3, which here has a ferromagnetic material 4, which is coated on both sides by a plastic material 5.
  • the flow cross section of the channel section 2 is subdivided into a plurality of subchannels 6, which lie parallel to the longitudinal direction of the tube section 2 and have a profile (perpendicular to the longitudinal axis L) of substantially honeycomb-shaped structure with hexagonal wall shapes.
  • the walls of the sub-channels 6 are also surrounded by a plastic lined with a magnetic material (ie, a ferromagnetic or ferrimagnetic material).
  • the pipe section 2 On its outer side, the pipe section 2 is surrounded by a coil 7 with a plurality of windings 8.
  • an alternating electric field F at the location of the magnetic material 4 is generated by the coil 7, which is connected to a frequency generator (o.Fig.), Since the plastic sheath 5 for the alternating magnetic field F is substantially transparent is.
  • the magnetic material 4 is heated further and further until it reaches its Curie temperature Tc.
  • the magnetic material 4 for the alternating magnetic field F is no longer receptive and is therefore not further heated.
  • the magnetic material 4 can thus be set exactly to the Curie temperature Tc, without the risk of overheating.
  • the Curie temperature Tc can be accurately specified by an appropriate choice of materials.
  • the heat W generated in the magnetic material 4 by the irradiation of the alternating magnetic field F is at least partially transmitted to the plastic jacket 5 and further into the process medium M.
  • the channel section 2 may be surrounded on its outside with a heat-insulating material.
  • the channel section 2 thus constitutes a continuous flow heater for the process medium M flowing through.
  • the process medium M can be air or a liquid (for example water or lye).
  • This channel section 2 has over a water heater with a conventional resistance heating on the advantage that can be dispensed with large-volume resistance heating.
  • the windings 8 of the coil 7 occupy comparatively little space. It is also possible comparatively fine structures, such as the sub-channels 6, set up a large area for heat dissipation. As a result, a particularly effective and compact possibility for heating the process medium M can be provided.
  • the pipe section 2 can be produced comparatively easily, for example in the context of a single production process, e.g. by a two-component injection molding process or two-shot process.
  • the channel section 2 can be introduced, for example, in a process air duct of a laundry dryer and can heat there, for example, in a treatment room of the laundry dryer to be blown air.
  • the channel section 2 can be used, for example, for heating liquor in a washing machine having a washing function.
  • Another application for a laundry treatment appliance is the heating of supplied fresh water.
  • the pipe section 2 can also be a (ferromagnetic or ferri-) magnetic pipe without the plastic coating, in particular if the process medium M is a dry gas or the magnetic material 4 is insensitive to corrosion by the process medium M.
  • Fig.2 shows a further component of a laundry treatment device 11 in the form of a tub 12, which similar to the pipe section 2 has a sheathed by a plastic 5 core of a magnetic (ferromagnetic or ferrimagnetic) material 4.
  • the tub 12 receives liquor L, in which a lower part of a laundry drum (not shown) rotates.
  • the liquor L is typically heated for cleaning, conventionally resistive heating elements are attached to the tub 12 or in a occupied by the liquor L space between the tub 12 and the laundry drum.
  • the tub 12 is heated itself by an externally mounted coil 13 with preferably a plurality of windings 14 is circularly wound around a region which is also wetted by the liquor L, the bottom of the tub 12.
  • first heat W can be delivered very effectively into the liquor L, for which purpose the tub 12 may be provided on its outside with a heat-insulating material.
  • a space between the tub 12 and the laundry drum can be kept particularly small, whereby a lot of required for a wash liquor L can be reduced.
  • the reduction in liquor L in turn reduces water consumption and energy consumption. In addition, it does not take so much detergent in the liquor L for effective cleaning of the laundry.
  • Fig.1 In an operation of the washing machine 11, similar to the pipe section 2 is made Fig.1 , by the coil 13 generates an alternating magnetic field F, which heats the magnetic material 4, which in turn the liquor L can be heated. It may be sufficient if the tub 12 only to a maximum level of the liquor L, the magnetic material 4 having the predetermined Curie temperature Tc, or the magnetic material 4 even occupies an even smaller area at a lower portion of the tub 12.
  • FIG 3 shows a section of a washing machine 21 with a tub 22, wherein the tub 22 a conventional tub or in Fig.2 shown magnetically heated tub 12 may be.
  • the tub 22 has a switch at a predetermined Curie temperature Tc sensor or Curie switch 23, which is carried out here physically in two parts.
  • the Curie switch 23 consists of a volume of (ferro- or ferri-) magnetic material 24 disposed on an inside of the tub 22 at a position which is typically covered by the liquor L, here: at the bottom Point of the tub 22.
  • the magnetic material 24 is surrounded by a plastic jacket.
  • a second part of the Curie switch 23 On the dry outer side of the tub 22 and the magnetic material 24 opposite or separated by the tub 22 is a second part of the Curie switch 23 with a coil 25 and an evaluation circuit 26. About the coil 25 is passed through the tub 22, which at least at this point is permeable to the alternating magnetic field generated by the coil 25, generates at the location of the magnetic material 24, the alternating magnetic field, wherein an associated field strength is not so high that it has a significant heating of the magnetic material 24 result ,
  • the magnetic material 24 changes its magnetic property when the liquor L reaches a predetermined Curie temperature Tc of the magnetic material 24.
  • the "magnetic environment" of the coil 25 changes, which can be detected by means of the evaluation logic 26.
  • the evaluation logic 26 can be detuned by reaching the Curie temperature Tc in the Ausenselogik 26 existing or coupled thereto resonant circuit, which is sensed with high accuracy.
  • Such sensors are available as integrated circuits and very cost effective.
  • the Ausenselogik 26 can then turn off a switchable by the Curie switch 23 heater 28 for heating the liquor L.
  • an output signal of the evaluation logic 26 can be used as a release for a relay or a TRIAC, via which in turn a heating current can be switched.
  • the heater 28 may be a conventional heater or a 'magnetic heater', in particular as described above.
  • This Curie switch 23 which is also operable only as a Curie sensor, can reliably detect reaching the Curie temperature Tc from a lower temperature or from a higher temperature. If, for example, the temperature of the liquor L decreases again when the heater 28 is switched off, the magnetic material 24, upon reaching the Curie temperature Tc, is absorbed again by a higher temperature for the alternating magnetic field F, whereby the resonant circuit of the evaluation logic 26 is retuned. Then, the Curie switch 23, the heater 28 turn on again.
  • the Curie switch 23 shown it is also possible to use other Curie switches (valves, relays etc.) or Curie sensors, such as, for example US 4,303,196 and US 4,414,519 known.
  • the part in contact with the process medium M is preferably surrounded by a protective jacket 27, in particular if the process medium M is a corrosive medium.
  • a Curie switch 23, for example has the advantage over a bimetallic element that it switches very precisely with the Curie temperature and, for example, is also insensitive to thermal cycling.
  • a plunger of the relay or the solenoid valve can be in direct contact with the liquor L, via a protective sheath or seal.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)
EP11165401.8A 2010-05-18 2011-05-10 Appareil de traitement du linge et procédé de fonctionnement d'un appareil de traitement du linge Withdrawn EP2388369A3 (fr)

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Cited By (2)

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EP3276072A1 (fr) * 2016-07-26 2018-01-31 Miele & Cie. KG Procédé et dispositif de traitement de linge, procédé et dispositif de fonctionnement d'une machine de traitement de linge et machine de traitement de linge permettant de traiter le linge
CN113605055A (zh) * 2021-09-14 2021-11-05 海信（山东）冰箱有限公司 滚筒洗衣机

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DE102011089757A1 (de) * 2011-12-23 2013-06-27 BSH Bosch und Siemens Hausgeräte GmbH Behälter mit Beheizbarkeit einer darin aufgenommenen Flüssigkeit
DE102014208514A1 (de) * 2014-05-07 2015-11-12 BSH Hausgeräte GmbH Wäschebehandlungsgerät mit Induktionsheizung
DE102022204658A1 (de) 2022-05-12 2023-11-16 Robert Bosch Gesellschaft mit beschränkter Haftung Vorrichtung zum Erwärmen einer Flüssigkeit in einem Rohr

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US4303196A (en) 1980-03-24 1981-12-01 Arnold Raines Temperature sensitive valve
US4414519A (en) 1982-03-10 1983-11-08 Allied Corporation Temperature-sensitive relay
EP0418807A2 (fr) 1989-09-19 1991-03-27 Rjf International Corporation Dispersions magnétiques de particules de ferrite à produit d'énergie magnétique élevé dans un caoutchouc de nitrile hautement saturé et méthode de fabrication
US5182427A (en) 1990-09-20 1993-01-26 Metcal, Inc. Self-regulating heater utilizing ferrite-type body
US5329085A (en) 1992-08-05 1994-07-12 Metcal, Inc. Temperature self regulating heaters and soldering irons
DE102008044280A1 (de) 2008-12-02 2010-06-10 BSH Bosch und Siemens Hausgeräte GmbH Hausbereich-Durchlauferhitzer

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US4303196A (en) 1980-03-24 1981-12-01 Arnold Raines Temperature sensitive valve
US4414519A (en) 1982-03-10 1983-11-08 Allied Corporation Temperature-sensitive relay
EP0418807A2 (fr) 1989-09-19 1991-03-27 Rjf International Corporation Dispersions magnétiques de particules de ferrite à produit d'énergie magnétique élevé dans un caoutchouc de nitrile hautement saturé et méthode de fabrication
US5182427A (en) 1990-09-20 1993-01-26 Metcal, Inc. Self-regulating heater utilizing ferrite-type body
US5329085A (en) 1992-08-05 1994-07-12 Metcal, Inc. Temperature self regulating heaters and soldering irons
DE102008044280A1 (de) 2008-12-02 2010-06-10 BSH Bosch und Siemens Hausgeräte GmbH Hausbereich-Durchlauferhitzer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3276072A1 (fr) * 2016-07-26 2018-01-31 Miele & Cie. KG Procédé et dispositif de traitement de linge, procédé et dispositif de fonctionnement d'une machine de traitement de linge et machine de traitement de linge permettant de traiter le linge
EP3276072B1 (fr) 2016-07-26 2019-06-12 Miele & Cie. KG Procédé et dispositif de traitement de linge dans une machine de traitement de linge et machine de traitement de linge permettant de traiter le linge
CN113605055A (zh) * 2021-09-14 2021-11-05 海信（山东）冰箱有限公司 滚筒洗衣机
CN113605055B (zh) * 2021-09-14 2024-03-19 海信冰箱有限公司 滚筒洗衣机

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