EP2504482A1 - Appareil de traitement du linge comprenant un générateur de vapeur et procédé de fonctionnement d'un appareil de traitement du linge - Google Patents

Appareil de traitement du linge comprenant un générateur de vapeur et procédé de fonctionnement d'un appareil de traitement du linge

Info

Publication number
EP2504482A1
EP2504482A1 EP10782261A EP10782261A EP2504482A1 EP 2504482 A1 EP2504482 A1 EP 2504482A1 EP 10782261 A EP10782261 A EP 10782261A EP 10782261 A EP10782261 A EP 10782261A EP 2504482 A1 EP2504482 A1 EP 2504482A1
Authority
EP
European Patent Office
Prior art keywords
steam
laundry
steam generator
temperature
heating unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10782261A
Other languages
German (de)
English (en)
Other versions
EP2504482B1 (fr
Inventor
Kai Nitschmann
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
Priority to PL10782261T priority Critical patent/PL2504482T3/pl
Publication of EP2504482A1 publication Critical patent/EP2504482A1/fr
Application granted granted Critical
Publication of EP2504482B1 publication Critical patent/EP2504482B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D06F39/40—
    • 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 
    • D06F58/203—Laundry conditioning 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters

Definitions

  • the invention relates to a laundry treatment appliance, in particular Wäschetrocknungsge- device, comprising a rotatable laundry drum, which is mounted on a bearing plate, a steam generator with a heating unit for generating a vapor from a liquid and a fluidically connected to the heating unit steam outlet opening, which opens into the laundry drum ,
  • the invention also relates to methods for operating a laundry treatment appliance.
  • the document WO 1996/032607 A1 relates to a steam generator, in particular for the household sector, and also relates to a method and a device for automatically performing a refilling of a reservoir of the steam generator.
  • a temperature within a cell that is in communication with the reservoir is measured by means of a temperature sensor.
  • the temperature detector When a level within the cell reaches a minimum level, the temperature detector is surrounded by vapor, the temperature of which is higher than a temperature of the liquid, and allows fluid to pass through the cell into the reservoir.
  • the liquid is channeled into the cell, it cools the temperature sensor and the fluid supply is stopped again.
  • EP 1 026 306 B1 relates to an automatically refillable steam generator for use with steam cleaning equipment, a steam iron, steam generating ironing boards with refill function, coffee machines, etc.
  • the steam generator has at least one heating element disposed on the outside of the steam generator and is equipped with a thermostat, wherein the steam generator is connected to one side of a water reservoir via a pump and a hose.
  • a laundry treatment device in particular laundry drying device, which has a rotatable laundry drum which is mounted on a bearing plate, as well as a steam generator with a heating unit for generating a vapor from a liquid and at least one (eg via at least one steam channel ) with the heating unit fluidly connected steam outlet opening that opens into the laundry drum.
  • the steam generator and the steam outlet opening are arranged or attached to the bearing plate.
  • a liquid e.g. Water with or without additives (for example, a fragrance)
  • heated to its boiling point and passed the boiling steam on the steam outlet in the laundry drum.
  • the steam can here be understood to mean pure steam or additionally steam enriched with water droplets ('mist').
  • the steam generator can be positioned close to, in particular immediately adjacent to, the at least one steam outlet opening short steam channel lengths between the steam generator and the at least one steam outlet opening can be realized. In turn, no or very little condensate forms on the inner wall or the inner walls of the steam channel. Thus, even without a special Tropfenabscheider adopted be prevented that drops are accelerated by the vapor pressure in the drum and produce there stains on the laundry or the textiles.
  • the at least one vapor channel which carries the vapor from the heating unit to the at least one vapor outlet opening, may be at least partially thermally insulated to further suppress condensation and thus formation of water droplets.
  • the steam channel is particularly short, may even be negligible short, if the steam outlet is coupled directly to the steam generator.
  • the heating unit has a continuous flow heater or is designed as such.
  • the water heater can be configured for a particularly suitable for attachment to the bearing plate particularly suitable elongated, in particular tubular. It is a particularly compact and easy-to-assemble configuration that the steam generator is not or not substantially laterally (in height and width extension) beyond the contour of the bearing plate.
  • the water heater is aligned at least obliquely upright.
  • an outlet end may be higher than an inlet end. This helps to quickly evaporate the liquid and reduces the formation of droplets.
  • the instantaneous water heater may be upright at least at an angle of 45 ° or more to a horizontal.
  • the water heater can be aligned as perpendicular as possible or at the greatest possible angle to the horizontal operating position. It is a particularly advantageous embodiment that the water heater is installed substantially vertically.
  • a boiling mirror ie, a surface of the liquid
  • a boiling mirror is located in an initial third of the water heater, ie, subsequent to the inlet end. Even so, a special rapid evaporation of the liquid and a reduction in the formation of drops are supported.
  • the heating unit has a boiler or is designed as such.
  • the boiler has an integrated liquid reservoir.
  • the water heater works without an integrated liquid reservoir.
  • the liquid reservoir is a heater component, e.g. a heating plate as or in the bottom of the liquid reservoir. The liquid is then evaporated in the liquid reservoir.
  • At least one temperature sensor is arranged at an inlet end of the heating unit, in particular the continuous flow heater.
  • the temperature sensor can be arranged, for example, on a surface of a heating tube of the flow heater, whereby a rapid response of the temperature sensor can be achieved on a dry cycle.
  • the dry protection can be realized, for example, by a method which also solves the above-mentioned object, with the following steps:
  • thermoelectric unit it is also possible to monitor for an undershooting of a further, lower temperature gradient, in particular a negative temperature gradient. If the heating unit is supplied with sufficient liquid, by a heat entrainment of the liquid, a temperature is kept low, in particular at the inlet end of the heating unit. If the volume flow of the liquid drops or even stops (dry off), the temperature applied to the heating unit increases. Falling below a critical volume flow can be achieved by exceeding the predetermined temperature. can be mapped. This applies analogously to a temperature gradient, whereby a reduction in the volume flow of the liquid and a dry-running can be detected by a corresponding temperature gradient.
  • At least one temperature sensor is mounted at an outlet end of the heating unit (a portion of the heating unit where steam has already been generated), in particular a continuous flow heater.
  • the measured values sensed by this at least one temperature sensor can be used for a temperature control, whereby a quantity of the conveyed liquid (volume flow) represents a possible control variable for the temperature control.
  • exceeding a temperature threshold and / or a temperature gradient at the outlet end may be used to detect overheating of the heating unit, e.g. as described above for the inlet end, possibly followed by a shutdown and / or switching off the heating unit in response to the exceeding.
  • the heating unit is provided with a resettable thermal fuse, e.g. a bimetal element, to prevent non-critical temperature excesses, which do not cause permanent damage to the heater.
  • a resettable thermal fuse e.g. a bimetal element
  • the heating unit be provided with a non-resettable thermal fuse, e.g. a fuselage, to prevent severe temperature violations that could cause damage to the heater.
  • a non-resettable thermal fuse e.g. a fuselage
  • the resettable thermal fuse and the non-resettable thermal fuse are attached to the heater as a structural unit.
  • the structural unit may be mounted on a suitable mounting device in an upper part of the heating unit.
  • the thermal fuses may be electrically connected in series in a circuit of the heating unit.
  • an evaporator can have all the temperature sensors and / or temperature protections mentioned in order to ensure high intrinsic safety of the steam generator, specifically against overheating in the event of a lack of liquid (eg in the case of a defective pump or a defective or clogged liquid feed channel).
  • the heating unit has at least one temperature sensor at an outlet end of the heating unit, a resettable thermal fuse, a non-resettable thermal fuse, and at least one dry-run protection (e.g., temperature sensor, level gauge) at an inlet end of the heating unit.
  • a temperature sensor at an outlet end of the heating unit
  • a resettable thermal fuse at an outlet end of the heating unit
  • a non-resettable thermal fuse at least one dry-run protection (e.g., temperature sensor, level gauge) at an inlet end of the heating unit.
  • dry-run protection e.g., temperature sensor, level gauge
  • the steam generator has a water reservoir.
  • a water reservoir can be integrated in the steam generator. Consequently, the water reservoir is attached to the bearing plate, which allows a particularly compact arrangement with a small fluid channel length.
  • the steam generator is attached directly to the end shield, e.g. latched, screwed and / or glued.
  • a pump is arranged on a housing of the water reservoir. This makes a particularly compact device possible.
  • the pump may e.g. be arranged in the liquid reservoir to allow a particularly compact design.
  • a fluid channel from the pump to the heating unit is at least partially formed in the housing of the water reservoir.
  • a fluid channel from the pump to the heating unit is at least partially formed in the housing of the water reservoir.
  • the steam generator has at least one molded fluid channel.
  • the fluid channel may comprise a fluid channel, a vapor channel or a combined liquid / vapor channel.
  • a molded fluid channel reduces the cost of the steam generator due to a lower material and assembly costs and reduces the risk of failure by eg loosening hoses. It is a particular embodiment that the steam generator has only molded-fluid channels and therefore has no hoses or other intermediate pieces, which can be solved in an operation of the laundry treatment device.
  • a filling of the liquid reservoir can be done in particular with water as the liquid, optionally with at least one additive.
  • the water is preferably descaled or has only a small amount of lime.
  • the water can be manually filled by the user, e.g. through a suitable filling opening in a region of a condensate casing.
  • the condensate water produced, for example, during a drying process can be conducted into the liquid reservoir, e.g. by controlling a three-way valve from a condensate pump instead of being directed into the condensate tank.
  • a filter element is present in front of the liquid reservoir, e.g. integrated at its entrance to filter out fine lint and other particles from the condensate.
  • the steam generator has a pressure relief valve for discharging pressurized liquid into the liquid reservoir. Thereby, a malfunction or even damage of the steam generator with a clogging on the steam side can be avoided.
  • the pressure relief valve triggers (in particular opens) if a nominal vapor pressure is exceeded by about 0.5 bar to 1 bar.
  • the pressure relief valve may be, for example, a spring-loaded ball valve.
  • the pressure relief valve may in particular be arranged in a fluid channel between and / or including a pressure outlet of a feed pump and an inlet end of a flow heater.
  • the relief valve may be disposed on a vapor side, particularly between and / or including an outlet end of the flow heater or boiler and a vapor outlet nozzle.
  • the steam generator is a vapor having a vapor pressure of about 0.25 bar to 2 bar, in particular from about 0.3 bar to 1, 5 bar, in particular from 0.5 bar to 1 bar.
  • This pressure range can, inter alia, by a suitable vote of an energy input (eg imaged by a heating power of the heating unit), a dosage of the amount of liquid in the water heater (eg by means of an adjustment of a clock or regulation of a feed pump for the liquid to be evaporated) and / or Opening width of the at least one steam outlet opening can be achieved.
  • This embodiment leads to a reduction of the formation of drops.
  • This suitably high vapor pressure also influences the quality of the steam; as the steam becomes 'drier'.
  • vapor components may more strongly swirl with the air in the drum, thereby making the temperature of the vapor mixture less critical with respect to treatment of any type of fabric, as well as in the event that the user opens the door and grips the drum during the program.
  • the at least one steam outlet opening can be designed as at least one outlet nozzle.
  • the at least one steam outlet opening may advantageously be directed at an angle into the laundry drum, so that the steam jet exiting through the at least one steam outlet opening is directed into the center of the drum, in particular into a region slightly below the drum center line.
  • the intended typical load cases up to about 2 kg of textiles
  • the steam jet which allows a good steaming of the laundry in short program times.
  • the laundry treatment appliance may in particular be a laundry drying appliance, eg a tumble dryer or a washer-dryer.
  • the described laundry treatment device allows a good refresh function with comparatively short treatment times.
  • the steam generator can be designed as a compact, preassemblable and testable unit.
  • the steam generator can in particular be equipped and preassembled as a unit with all the necessary functional elements and safety elements.
  • the steam generator can thus be completely pre-assembled by a system supplier and checked for all system functions, including safety functions.
  • the steam generator provides a high level of intrinsic safety.
  • the steam generator can be integrated according to a development in particular directly at the injection point in existing clearances of the bearing plate of the drum.
  • the above-mentioned object is also achieved by a method for operating a laundry treatment appliance, in particular a laundry treatment appliance as described above, wherein multiple steam is passed onto a laundry located in a rotary laundry drum and at the same time or (for better uniform distribution of moisture in the laundry) alternately the laundry is circulated.
  • a method for operating a laundry treatment appliance in particular a laundry treatment appliance as described above, wherein multiple steam is passed onto a laundry located in a rotary laundry drum and at the same time or (for better uniform distribution of moisture in the laundry) alternately the laundry is circulated.
  • a method can be used to make the fibers of the laundry soft and supple ("wrinkle out").
  • the interior of the laundry drum is preferably not or only slightly heated to maintain a residual moisture in the laundry, and the laundry is preferably alternately steamed and moderately agitated.
  • the object is also achieved by a method as described above, wherein the interior of the drum is additionally heated.
  • This method can be used, in particular, for refreshing the laundry ("odor removal") if the liquid applied to the textiles is caused to evaporate by heating the interior of the drum.
  • This steam extraction removes odor molecules from the laundry.
  • FIG. 1 shows in oblique view from the front a bearing plate of a tumble dryer with a steam generator according to a first embodiment
  • FIG. 3 shows diagonally downwardly a steam generator according to a second
  • FIG. 4 shows a diagonal rear view of the steam generator according to the second
  • Embodiment 5 shows a front view of a bearing plate of a tumble dryer with a steam generator according to a third embodiment
  • Fig. 6 is a functional diagram of a possible steam generator of the clothes dryer according to the first embodiment
  • Fig. 7 shows a first part of a possible flow chart of a laundry refining process for operating the clothes dryer with the steam generator of Fig. 3;
  • Fig. 8 shows a second part of a possible flow chart of the laundry refreshing process of Fig. 3;
  • FIG. 10 shows a first part of a possible flowchart of a laundry refreshing process for operating the clothes dryer with the steam generator of FIG. 6.
  • FIG. 1 shows in a view from the front and Figure 2 shows a sectional view in oblique view from front of a bearing plate 1 of a clothes dryer 2 with a steam generator 3 according to a first embodiment.
  • the steam generator 3 is attached directly to the bearing plate 1, for example latched, screwed and / or glued.
  • the steam generator 3 has a water heater 4.
  • the steam generator 3 is dimensioned so that it does not extend (in front view) laterally or not substantially beyond the bearing plate 1, which simplifies an adaptation of the embodiment of the laundry dryer 2 to the steam generator 3.
  • the water heater 4 with its heating tube 5 is not vertical, but installed at an angle.
  • an inlet end 6, at which a liquid to be heated, here: water, is introduced, is lower than an outlet end 7, at which a vapor produced by heating the liquid introduced exits.
  • the liquid to be supplied to the flow heater 4 at the inlet end 6 originates from a liquid reservoir 9 which forms part of the steam generator 3.
  • the liquid reservoir 9 is connected directly to the bearing plate 1, and the water heater 4 is connected directly to the liquid reservoir 9.
  • the flow heater 4 is More specifically, in an elongated recess 10 in the liquid reservoir 9 and its housing used, so that the water heater 4 is not or only slightly forward projecting from the liquid reservoir 9, resulting in a compact design.
  • the liquid reservoir 9 is connected to a higher water reservoir 26 via a filling funnel 11.
  • the filling funnel 1 1 is attached directly to a filler neck 27 of the liquid reservoir 9.
  • the water reservoir 26 can be manually filled by a user (eg with decalcified water and / or with additives), filled from a condensate water tank (which is located for example on a floor group) and / or represent the condensate water tank of the tumble dryer 2.
  • the liquid reservoir 9 can be filled manually by a user via a removable filling funnel.
  • the liquid contained in the liquid reservoir 9 is pumped to the inlet end 6 by means of a feed pump mounted on the rear side and fills the heating tube 5 up to an at least roughly predetermined water level. At the level of the water level, there is consequently the liquid surface of the standing liquid which is also called boiling mirror.
  • the heating tube 5 is adjacent to the heating of the liquid and the subsequent generation of steam in a current-fed heating element 8, such as a occidentalsflowerdraht, as part of the water heater 4.
  • the steam may have water droplets (and thus generally be a mixture of pure steam and water), wherein a small amount of water droplets or even their absence is preferred.
  • the boiling level is set in an initial third of the instantaneous water heater (ie close to the inlet end 6).
  • the steam rises to the outlet end 7.
  • the outlet end 7 of the flow heater 4 leads via a steam channel in the form of a short connecting hose 31 to a steam outlet nozzle 12, which is also attached to the bearing plate 1 as a separate component.
  • the connecting tube between the outlet end 7 and the steam outlet nozzle 12 can be kept short due to their spatial proximity and is also thermally insulated, whereby a drop education is suppressed on a wall of the steam channel, so that no or only a few such droplets are entrained with the steam to the Dampfauslassdüse and further into the laundry drum W.
  • the steam outlet nozzle 12 opens into a rotatable laundry drum W of the tumble dryer 2.
  • the steam outlet nozzle 12 is directed obliquely downwards, so that the steam jet emitted by it is directed to slightly below the center of the laundry drum W to typical laundry loads, eg from about 2 kg, effective steaming.
  • the laundry drum W can be loaded by a loading opening B of the endshield 1.
  • the Dampfauslassdüse is attached to or near the upper vertex d of the bearing plate 1, but at least on an upper half of the bearing plate 1. Consequently, a positioning of the steam generator 3 at an upper half of the bearing plate. 1 prefers.
  • the steam generator 3 further comprises an NTC temperature sensor (not shown), which is arranged at the outlet end 7 of the water heater 4.
  • the NTC temperature sensor may be used to measure a steam temperature of the generated or exiting steam to control the steam temperature in a predetermined range or to a predetermined value. The designed for this control device is not shown. If a steam temperature of the NTC temperature sensor exceeds a predetermined threshold value, which may indicate an excessively high operating pressure, the steam generator 3 can be switched off.
  • the steam generator 3 also has accommodated in a common housing 28 a reversible temperature switch in the form of a bimetallic switch and an irreversible temperature switch in the form of a fuse, which are arranged on the heating element 8 in its circuit.
  • the reversible temperature switch interrupts the power supply to the heating element 8, if an associated temperature threshold is reached or exceeded.
  • the irreversible temperature switch interrupts the power supply to the heating element 8 permanently, if an associated, higher temperature threshold is reached or exceeded.
  • Dry running is also avoided by a level sensor or level sensor located in or on the liquid reservoir 9 (not shown).
  • the various sensors and switches thus enable a particularly safe operation of the steam generator 3, in particular by its multi-stage and / or redundant design with regard to dry running.
  • the operation of the sensors and switches will be described in greater detail in FIGS. 6 to 10.
  • a pressure relief valve 20 is provided in the liquid channel between the feed pump and the inlet end 6, which opens the liquid channel with respect to the liquid reservoir 9 from a predetermined pressure threshold value.
  • the pressure relief valve 20, which is formed here in one piece with the inlet end 6, is connected to the liquid reservoir 9 via a short return hose 29.
  • the liquid from the feed pump is brought from the back of the liquid reservoir 9 by means of a hose 30. Clogs the steam side of the steam generator 3, e.g. by clogging the outlet end 7 or the steam outlet nozzle 12, the vapor pressure and consequently the pressure of the liquid at the inlet end 6 increases.
  • the pressure relief valve 20 opens at a pressure which is 0.5 bar to 1 bar above the typical or nominal steam operating pressure lies. As a result, liquid is passed back into the reservoir 9 through the return hose 29 while reducing the pressure.
  • the pressure relief valve 20 may e.g. having a spring-loaded ball as the closure element. By selecting the spring force, a switching point can be set.
  • the NTC temperature sensor at the outlet end 7 may be connected to detect a blockage so that a multiple, especially in approximately periodic, recurring temperature increase is detected. Because the increase in the vapor pressure associated with the blockage can also increase the vapor temperature. act, the steam temperature decreases after the opening of the pressure relief valve 20 by the pressure reduction again. When the steam side becomes blocked, the rise and fall of the steam temperature is repeated regularly and can be detected by the occurrence of a plurality of temperature peaks, for example within a predetermined time interval. As a result, the steam generating unit 3 can be switched off, possibly with the output of a corresponding error message such as "nozzle clogged".
  • FIG. 3 shows a view obliquely from behind and below in oblique view from behind a steam generator 33 according to a second embodiment.
  • the steam outlet nozzle 12 is now attached to the steam generator 33 and forms part of it.
  • the steam generator 33 can thus be pre-assembled and tested with the steam outlet nozzle 12, which enables a particularly inexpensive and effective preliminary test.
  • 4 shows the steam generator 33 of its the bearing plate 1 facing back.
  • the feed pump 19 is attached to the liquid reservoir 9, in the housing 9 of the liquid reservoir protruding receptacles 24.
  • the suction side of the feed pump 19 is connected via a short suction hose 34 with an intake port 35 of the liquid reservoir 9 and about it.
  • the pressure side of the feed pump 19 is connected via the hose 30 to the pressure relief valve 20 and the inlet end 6.
  • FIG. 5 shows a front view of a bearing plate 1 of a clothes dryer W with a steam generator 13 according to a third embodiment similar to FIG.
  • the heating unit is now designed as a boiler 14, which has an integrated liquid reservoir 15 with a serving as a bottom plate of the liquid reservoir 15 heating plate 16.
  • the liquid reservoir 15 is connected to the filling funnel 1 1 not via a hose, but a rigid liquid supply channel 17, which may be formed integrally with the liquid reservoir 15 or with the filling funnel 11.
  • An upper outlet end 18 of the boiler 14, from which the steam exits, is connected directly to the steam outlet nozzle 12.
  • liquid F in particular decalcified water is pumped via an evaporator pump or pump 19 to the water heater 4.
  • the feed pump 19 can be operated, for example, in a pulse mode.
  • a pressure relief valve 20 is connected in fluidic parallel.
  • the funded by the pump 19 fluid F is conveyed into the heating tube 5 of the water heater 4 and brought there by means of the heating element 8 of the water heater 4 to boiling.
  • a boiling mirror is provided in a lower third of the heating tube 5, ie, fluidly behind the inlet end 6.
  • the vapor D generated in the heating tube 5 emerges from the outlet end 7 as shown by the arrow and is forwarded to the steam inlet nozzle.
  • the steam generator 3, 33 is protected by four protection units, namely an NTC temperature sensor T1, which is arranged on the steam side at the outlet end 7 of the water heater 4, a reversible temperature switch T2 in the form of a bimetallic switch, which is arranged on the heating element 8, a irreversible temperature switch T3 in the form of a fuse, which is also associated with the heating element 8, and a level sensor or level sensor N in or on the liquid keitsreservoir.
  • NTC temperature sensor T1 which is arranged on the steam side at the outlet end 7 of the water heater 4
  • a reversible temperature switch T2 in the form of a bimetallic switch, which is arranged on the heating element 8
  • a irreversible temperature switch T3 in the form of a fuse, which is also associated with the heating element 8
  • a level sensor or level sensor N in or on the liquid keitsreservoir.
  • the NTC temperature sensor T1 serves to measure a steam temperature of the generated or exiting steam D.
  • the measured values of the NTC temperature sensor T1 may be input to a control unit (not shown) of the clothes dryer 2 to maintain the steam temperature in a predetermined range or at a predetermined value.
  • the feed pump 19 can be used to promote more or less liquid F. If more liquid F is conveyed, the steam temperature drops at a constant heating power, conversely the steam temperature rises when the flow rate decreases or the liquid volume flow decreases.
  • a control of the steam temperature over a delivery rate of the feed pump 19 and thus via a liquid volume flow to the water heater 4 is practical and control technology comparatively easy to perform.
  • a heating power of the heating element 8 can be used to adjust the steam temperature.
  • an associated predetermined temperature threshold for example of 230 ° C
  • the heating unit for a short time eg, at least three seconds
  • the reversible temperature switch T2 which is integrated in a circuit of the heating element 8, a non-critical overheating of the heating element 8 is avoided, e.g. with a minor and permanent damage temperature increase.
  • the temperature switch T2 can be designed so that, if it is installed in the circuit, the power supply to the heating element 8 directly interrupts and thus leads to a decrease in temperature.
  • the irreversible temperature switch T3 which may be turned on in particular in series with the reversible temperature switch T2 in the circuit of the heating element 8, serves to avoid permanent damage to the heating element 8 or other parts of the water heater 4 or even the steam generator 3, 33.
  • the irreversible temperature switch T3 opens (e.g., a fusing material melts) so that for further operation of the heating unit T8, the irreversible temperature switch T3 must be replaced.
  • a temperature which leads to the activation of the irreversible temperature switch T3 indicates a fundamental malfunction of the instantaneous water heater 4.
  • the temperature at which the irreversible temperature switch T3 trips for example at 290 ° C, is higher than the temperature at which the reversible temperature switch T2 trips, e.g. 150 ° C.
  • the level sensor N which warns of an excessively low liquid level in the liquid reservoir and / or triggers corresponding actions, for example emits a warning tone and / or temporarily sets the operation of the steam generator 3, 33, can be present as a dry-hover protection.
  • the level sensor N can be designed as a reed sensor and / or as a float.
  • the four sensors or switches T1, T2, T3 and N provide a high degree of operational safety.
  • the NTC temperature sensor T1 is arranged to control a steam temperature of the steam D and to protect against overheating of the steam
  • the two temperature switches T2 and T3 secure the Heating element 8 against failure
  • the level sensor N avoids dry running and thus damage to the steam generator 3, 33rd
  • FIG. 7 shows a first part of a possible flow chart of a laundry refining process (odor removal, etc.) for operating the laundry dryer 2 with the steam generator 3, 33.
  • the liquid reservoir 9 is filled.
  • the filling funnel 1 1 can be manually filled by a user or automatically via a pump with condensate water from a condensate water tank. For a manual filling of the hopper 1 1 this can be removed.
  • the filling funnel 1 1 can also represent a condensate tank.
  • one or more odor filters can be inserted into the process air duct of the tumble dryer 2 in order to absorb odor particles removed by vaporization and heating from the laundry and to prevent their circulation in the tumble dryer 2.
  • the odor filter may e.g. be introduced in the area of a lint filter.
  • a program for refreshing laundry located in the laundry drum W is started. This program steams in a first section of the laundry (without heating) and then heats up the laundry, so that odor molecules are removed with the heated water molecules. It has been shown that such a sequence offers the best odor removal. During steaming, the steam generator 3 is activated.
  • step S4 a fill level inquiry of the liquid reservoir 9 is carried out by means of the fill level sensor N (step S4).
  • This level query is a permanent function, that is, it is performed continuously or at regular intervals as long as the program is running.
  • step S5 If it is detected by the at least one fill level sensor N that a maximum fill level of the liquid reservoir 9 has been reached and / or exceeded, an alarm (optical and / or acoustic) is sent in step S5, possibly together with a display unit of the clothes dryer 2 displayed, whereby a user is informed that the level in the liquid reservoir 9 is too high.
  • dosage errors may be displayed online if the program has been initially selected (step S3 before step S1 in an alternative embodiment).
  • a minimum fill level of the liquid reservoir 9 is reached or undershot, in a step S6 the steam generator is deactivated, e.g. and, in addition (analogously to the case of too high a level) a user is visually and / or acoustically warned, whereby a dialogue can also be displayed in a display unit (e.g., "too little water”). The user can then, e.g. fill the liquid reservoir 9 (step S1).
  • the feed pump 19 is first activated in a step S7 following step S4. Since the feed pump 19 in this embodiment can be operated in pulse mode, it is clocked accordingly. As a result, the feed pump 19 conveys liquid F from the liquid reservoir 9 to the heating tube 5, which fills up accordingly.
  • a drive for the washing drum W for a secondary rotation direction is controlled (step S8), that is rotated in a rotational direction which corresponds to the opposite direction of rotation during a drying process.
  • a rotational direction which corresponds to the opposite direction of rotation during a drying process.
  • an air flow through the laundry drum W is reduced, which facilitates the moistening of the laundry.
  • the reversal of the drum rotation direction is not mandatory and may be e.g. not used with devices with only one drum rotation direction.
  • the heating element 8 is switched on in a time-delayed manner (for example by 3 to 5 seconds) in a step S9.
  • the liquid F in the heating tube 5 is boiled and evaporated.
  • the steam D thus produced here: steam with or without additives, exits through the outlet end 7 and continues into the laundry drum W via the steam outlet nozzle.
  • the vapor pressure is preferably present. within a range between 0.25 bar and 2 bar, in particular between 0.3 bar and 1, 5 bar, in particular between 0.5 bar and 1, 0 bar.
  • step S10 the NTC temperature sensor T1 measures the steam temperature of the generated steam D. This takes place continuously, e.g. periodically.
  • the delivery rate of the feed pump 19 for setting the steam temperature is regulated via the values determined by the temperature sensor T1, for example by storing characteristic curves in a look-up table of a central control unit.
  • the heating element 8 in step S1 1 for a predetermined period of time, e.g. at least 3 seconds, switched off. It is assumed that at a constant entry of a heating power through the heating element 8, the delivery rate or the maximum liquid volume flow of the feed pump 19 is not sufficient to lower the steam temperature sufficiently.
  • the reversible temperature switch T2 which is designed as a bimetal switch, and the irreversible temperature switch T3 "measure" or react in a step S12 to a temperature T A0 applied to the heating element 8. If the temperature T A0 of the heating element 8 reaches or exceeds a first safety threshold value, eg 150 ° C., the temperature switch T2 opens and thereby interrupts the power supply to the heating element 8, whereupon it cools down (step S13). Since the temperature switch T2 is reversible, it will close after a drop in the temperature of the heating element 8 to the first safety threshold or in the presence of a hysteresis to an underlying temperature value, so that the heating element 8 is operated again.
  • a first safety threshold value eg 150 ° C.
  • the irreversible temperature switch T 3 is activated and interrupts the circuit of the heating element 8 permanently until it is replaced, eg by customer service. which can check the water heater 4. This will ensure that that Heating element 8, the water heater 4 or the steam generator 3 are not irreparably damaged.
  • the irreversible temperature switch T3 protects against a failure of the reversible temperature switch T2. With a failure-free reaching one end of a period of the evaporator function, for example after five minutes, the heating element 8 is first turned off in a step S15. Thereafter, in a step S16, the feed pump 19 is turned off.
  • the feed pump 19 is switched off in a delayed manner compared to the heating element 8, for example with a time delay of two to five seconds.
  • the laundry drum W is stopped, whereby the evaporation section is finished.
  • the drying section starts in a following step S18, in which the laundry drum is started again in the main direction of rotation and in a step S19 a drum heating is activated for heating an air in the laundry drum, e.g. to a power of about 2000 watts, which is e.g. a heating level 2 may correspond.
  • This drying section may be performed for a predetermined period of time, e.g. for six minutes.
  • the program is ended in a last step S20.
  • the laundry can be taken out of the laundry drum W and e.g. be hung up.
  • the evaporation section of steps S4 to S17 and the drying section of steps S18 and S19 may be repeated one or more times.
  • a sequence for the crumbling of the laundry which corresponds approximately, in particular precisely, to the sputtering section with the steps S4 to S17, can follow the described refreshment procedure.
  • the unfreezing process can also be activated separately.
  • FIG. 9 shows a functional sketch of another possible steam generator 21 of the tumble dryer 2 according to the first or the second embodiment using a continuous flow heater 22.
  • the steam generator 21 is constructed similarly to the steam generator 3 shown in FIG. 6, except that instead of the level sensor N, a second NTC temperature sensor T4 is mounted in the region of an inlet end 6 of the instantaneous heater 22, preferably on the heating tube 5 in a region in which the heating tube 5 is still filled with liquid F during operation.
  • the second NTC temperature sensor T4 is operated permanently. Due to the constant tracking of liquid F in the operation of the flow heater 22, the heating tube 5 is permanently cooled at its inlet end 6.
  • step 10 shows a first part of a possible flowchart of a method for operating the tumble dryer 2 with the steam generator 21 from FIG. 9.
  • dry-running is now detected in that the second NTC temperature sensor T4 measures temperature measured values T at regular times in step S21 after switching on the heating element 8 in step S9, which in the central control unit converts into corresponding temperature gradients ⁇ be adapted over successive time intervals.
  • step S21 If it is determined in step S21 that the measured temperature gradient ⁇ reaches and / or exceeds a predetermined maximum temperature gradient, the heating element 8 is deactivated and all program functions are stopped (step S22). In addition, a corresponding alarm is issued and, if necessary, a dialog is displayed, eg in the sense of "lack of water". The user can then refill the liquid reservoir 9. Should it despite refilling the liquid reservoir 9 continue to If this error message comes in, for example, an instruction manual may indicate that the customer service has been notified.
  • step S21 If it is determined in step S21 that the measured temperature gradient ⁇ reaches and / or falls below a predetermined minimum temperature gradient, the heating element 8 is likewise deactivated, and all program functions are also stopped in this case (optional step S23). In addition, a corresponding alarm is output and, if necessary, a dialog is displayed, e.g. in the sense of "thermal fuse defective". Thus, e.g. a lifetime-related flattening of a voltage / temperature characteristic can be detected. The user should then contact customer service.
  • the illustrated first part of the flow chart may be e.g. the part of the flowchart of the first variant of the steam generator 3 shown in Fig.8 connect. It may be an embodiment that via the first NTC temperature sensor T1 also a query of the temperature gradient is performed, which queries whether a temperature gradient is less than one, where similar to step S23, the heating unit is turned off, all program functions are stopped and an alarm / Dialog "Thermal fuse defective" will be output.
  • the reversible temperature switch T2 instead of a bimetal switch, for example, also use a corresponding interconnected NTC sensor.

Abstract

La présente invention concerne un appareil de traitement du linge comprenant un tambour de lavage (W) rotatif monté sur une flasque (1), un générateur de vapeur (3) comprenant une unité de chauffage (4) servant à chauffer une vapeur (D) à partir d'un liquide (F) et au moins une ouverture de sortie de vapeur (12) reliée fluidiquement à l'unité de chauffage (4) et débouchant dans le tambour de lavage (W), le générateur de vapeur (3) et l'ouverture de sortie de vapeur (12) étant disposés sur la flasque (1). Le procédé sert à faire fonctionner un appareil de traitement du linge et comprend au moins les étapes suivantes consistant à : surveiller qu'une température à une extrémité d'entrée (6) de l'unité de chauffage (4) ne dépasse pas une valeur de température prédéterminée et/ou un gradient de température prédéterminé ; et mettre hors service et/ou à l'arrêt de l'unité de chauffage (4) en réponse au dépassement. Un autre procédé sert à faire fonctionner un tel appareil de traitement du linge, de la vapeur D étant acheminée plusieurs fois sur un linge situé dans un tambour de lavage W rotatif et le linge étant brassé simultanément ou alternativement.
EP10782261.1A 2009-11-25 2010-11-19 Appareil de traitement du linge présentant un générateur de vapeur et procédé de traitement d'un appareil du linge Active EP2504482B1 (fr)

Priority Applications (1)

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PL10782261T PL2504482T3 (pl) 2009-11-25 2010-11-19 Urządzenie do obróbki prania z wytwornicą pary i sposób eksploatacji urządzenia do obróbki prania

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DE102009047154A DE102009047154A1 (de) 2009-11-25 2009-11-25 Wäschebehandlungsgerät mit einem Dampferzeuger und Verfahren zum Betreiben eines Wäschebehandlungsgeräts
PCT/EP2010/067842 WO2011064149A1 (fr) 2009-11-25 2010-11-19 Appareil de traitement du linge comprenant un générateur de vapeur et procédé de fonctionnement d'un appareil de traitement du linge

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EP2504482A1 true EP2504482A1 (fr) 2012-10-03
EP2504482B1 EP2504482B1 (fr) 2015-04-01

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EP (1) EP2504482B1 (fr)
CN (1) CN102666962B (fr)
DE (1) DE102009047154A1 (fr)
PL (1) PL2504482T3 (fr)
WO (1) WO2011064149A1 (fr)

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EP2610397B1 (fr) 2011-12-28 2020-04-01 Electrolux Home Products Corporation N.V. Appareil domestique pour sécher le linge doté d'un réservoir pour liquides avec une entrée de remplissage
EP2610399B1 (fr) 2011-12-28 2014-08-06 Electrolux Home Products Corporation N.V. Appareil domestique pour sécher le linge doté d'un réservoir pour liquides
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EP2612963B1 (fr) * 2012-01-05 2016-03-30 Electrolux Home Products Corporation N.V. Appareil pour sécher le linge
WO2014075848A1 (fr) * 2012-11-13 2014-05-22 Arcelik Anonim Sirketi Machine de type lave-linge et/ou sèche-linge pourvue d'un générateur de vapeur
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Publication number Publication date
DE102009047154A1 (de) 2011-06-16
WO2011064149A1 (fr) 2011-06-03
CN102666962B (zh) 2015-03-11
CN102666962A (zh) 2012-09-12
EP2504482B1 (fr) 2015-04-01
PL2504482T3 (pl) 2015-08-31

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