EP3253914B1 - Verfahren zur ermittlung von wäscheeigenschaften und hierfür geeigneter kondensationstrockner - Google Patents

Verfahren zur ermittlung von wäscheeigenschaften und hierfür geeigneter kondensationstrockner Download PDF

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Publication number
EP3253914B1
EP3253914B1 EP16700074.4A EP16700074A EP3253914B1 EP 3253914 B1 EP3253914 B1 EP 3253914B1 EP 16700074 A EP16700074 A EP 16700074A EP 3253914 B1 EP3253914 B1 EP 3253914B1
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EP
European Patent Office
Prior art keywords
condensate
laundry
sensor
water
water level
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EP16700074.4A
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German (de)
English (en)
French (fr)
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EP3253914A1 (de
Inventor
Alvaro Harbach
Jarmila GUIJARRO REZNICKOVA
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Priority to PL16700074T priority Critical patent/PL3253914T3/pl
Publication of EP3253914A1 publication Critical patent/EP3253914A1/de
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    • 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 
    • D06F58/24—Condensing 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the invention relates to a method for determining properties of laundry items in a drying process and to a condensation dryer suitable for carrying out this method (also referred to below as "dryer").
  • the invention relates in particular to a method for operating a condensation dryer with a process air duct, a drum with laundry items placed therein, a heat exchanger for condensing water from moist, warm process air, a liquid sensor in a condensate pan, wherein the liquid sensor is a water level sensor or a system of water level sensors Time measuring device and a control device.
  • the invention also relates to a condensation dryer which is particularly suitable for carrying out this process.
  • Drying processes according to the condensation method are based on the evaporation of moisture from laundry items by means of warm process air and dehumidification of the process air by condensation on a heat exchanger.
  • the cool process air is initially passed through a fan generally via a heater.
  • the dry-heat process air then enters the drum as a drying chamber, which contains the items to be dried.
  • the dry-heat process air absorbs moisture from the laundry.
  • the now moist, warm process air is forwarded by the drum for dehumidification, for example, in an air-to-air heat exchanger or the evaporator of a heat pump.
  • the moist, warm process air is cooled down therein and the water contained in it is condensed and collected in a so-called condensate tray, which is generally located below the heat exchanger.
  • the condensed water is typically pumped by a pump (also referred to herein as a "condensate pump") into a caching container (referred to herein as a “condensate container”) or into a sewer.
  • a drying process is divided into three phases, namely a heating phase, a main drying phase and a cooling phase.
  • the heating phase the process air temperature rises until a predetermined temperature value is reached.
  • the process air With Increasing temperature, the process air and increasingly absorb more water from the laundry, ie it condenses increasingly more water to the heat exchanger used for cooling.
  • the preset temperature the process air generally absorbs a constant amount of water from the laundry in the drum. This means that the condensation of water remains constant.
  • This section is referred to as a stationary phase of a drying process or as a main drying phase. The course of the evaporation or condensation is stationary as long as surface water evaporates from the laundry items.
  • a drying process (also referred to as "drying program") is concluded with a cooling phase in which the heating is generally switched off and in which the dried laundry is cooled.
  • the transition from stationary to unsteady phase is of particular importance, since this transition contains information about the moisture content of the items of laundry and thus makes it possible to control a drying process very precisely and thus to carry out laundry-friendly and energy-efficient.
  • a method that enables accurate determination of this transition in a drying process is therefore desirable.
  • the heating-up phase is also important for a laundry-friendly and energy-efficient control of a drying process.
  • a determination of the loading of the drum with items of laundry should take place as early as possible in a drying process in order to be able to adapt the drying process to the loading at an early stage, since different quantities of items of laundry behave differently.
  • a method which allows a determination of the load already in the heating phase is therefore desirable.
  • the DE 10 2008 021 598 A1 describes a laundry drying apparatus with a control unit for controlling a drying process.
  • the control unit is set up to control the drying process on the basis of sensor data of a loading sensor.
  • the DE 10 2009 028 358 A1 describes a laundry treatment device for drying and / or washing laundry, with a rotatably mounted drum, an electric motor, which serves for driving the drum, and a control and measuring device for the electric motor, wherein the control and measuring device at least one electrical parameter of the electric motor detected and wherein the control and measuring device determines depending on the detected electrical parameters a loading of the drum, in particular the mass of the introduced into the drum laundry.
  • the DE 42 43 594 C2 describes a method for controlling the drying process of a tumble dryer comprising a drum, a heat transfer fan, a motor, a heater, two temperature sensors, and a humidity sensor, the sensors being disposed between the drum and the heat transfer fan.
  • the temperature change per unit time and a humidity value are measured, and an average value is determined from the sum of these two values, after which the amount of laundry based on the average value is determined as a small amount, a large amount or oversized amounts is and the further drying process is controlled according to the particular amount of laundry.
  • the DE 10 2006 037 239 A1 describes a clothes dryer or a laundry dryer and a method for controlling the drying of wet laundry in a laundry drum of a tumble dryer or washer dryer, in which hot air is generated and in which a drying process is terminated taking into account at least one moisture value or a corresponding reading of the laundry to be dried.
  • a temperature variable determined during the drying of the laundry during or after reaching a predetermined moisture value or a corresponding measured value, which corresponds to the respective type of laundry and / or the respective loading state of the laundry drum is used.
  • the DE 44 11 958 A1 discloses a household tumble dryer with an electronic program control device and with a rotatably mounted laundry drum and a fan for conveying the passing of a radiator over drying air through the laundry drum.
  • the increase over time of the electrical resistance of the material to be dried and the temperature difference between the drum inlet and outlet drum temperature are recorded and evaluated, conclusions being drawn therefrom with the aid of an electronic device on the type of laundry and the laundry weight of the material to be dried.
  • the data obtained in this way are supplied to the program control device as control variables for the further sequence control of the selected drying program.
  • the DE 199 18 877 A1 describes a method for estimating the loading and / or drying time of a household laundry drier prior to the drying process, wherein a laundry moisture dependent size and a measure of the temperature of an air stream for drying the laundry before and / or after its contact with the laundry is determined.
  • the amount dependent on the fabric moisture is used in conjunction with the measure of the temperature of the air stream before and / or after its contact with the laundry to estimate the loading and / or the drying time.
  • the EP 2 227 585 B1 describes a laundry drying apparatus and a method for operating this device, in which a moisture content of discharged from a laundry drum process air is determined and the moisture is at least partially condensed with a heat exchanger from the process air, wherein the moisture determination by measuring at least one temperature for a heat exchanger flowing through the Medium and by evaluating the measured temperature is determined.
  • the medium is either the process air or a coolant, and the moisture content is determined by measuring an outlet temperature of the medium on the outlet side of the heat exchanger and measuring an inlet temperature of the medium on the inlet side of the heat exchanger.
  • the disadvantage is that the laundry drying device must additionally be configured with at least one temperature sensor.
  • the WO 2014/040904 A2 describes a condensation dryer with determination of the load and a method for its operation.
  • At least one temperature sensor is arranged in a cooling medium channel and / or process air channel and the control device is set up in order to determine a loading of the drum with items of laundry on the basis of a time profile of the temperature measured with the at least one temperature sensor and a time profile of the amount of condensed water.
  • the condensation rate is determined, for example, via a water level sensor in the condensate tray or via a flow sensor or via the number of pump cycles in a specific period of time.
  • the patent DE 42 11 012 C2 describes a method for controlling the drying process in dependence on the moisture content of the material to be dried in a dryer for laundry or other objects to be dried, equipped with a condensation device for the expelled moisture, wherein the gradient of a state variable occurring at the condensation device, such as condensation amount, condensate Flow rate or the like, is used as a measured variable.
  • the rising gradient values provide information about the amount of laundry in a tumble dryer.
  • the EP 0 481 561 A2 describes a method of controlling the degree of dryness in a dryer, a washer-dryer or the like comprising a drum, conventional means for generating a circulation of hot air through the drum for drying the laundry therein, means for cooling said air, at least one tank or vessel for collecting the water removed from the laundry by said air, condensing on one or more of the devices during circulation, and a pump for removing the water from the vessel, advantageously cyclically.
  • the amount of water released from the laundry items during their drying is measured and a signal for stopping the machine is provided if the obtained measured value is less than a predetermined value.
  • the EP 1 006 231 A2 describes a method of controlling the drying of a wash load in a clothes washer or similar device in which an air stream is heated and used to remove water from said wash load and transported into at least one catch container, the variation (Q) in the Amount (L) of the water removed from the washing load is repeatedly detected during a number of predetermined time intervals (t). The heating of the air flow is interrupted in response to the variation (Q) which decreases below a predetermined value during at least one of the time intervals (tx).
  • the EP 2 808 548 A1 describes a method for monitoring the level of a Kondensiersystems a tumble dryer, the ongoing drying process is terminated when a full condensate tank is signaled at a certain load condition and a specific period of operation of the drain pump.
  • the object of the present invention was to provide an improved method for determining laundry properties and for controlling a drying process in a condensation dryer.
  • the object of the invention was also to provide a suitable condensation dryer.
  • the solution of this object is achieved according to this invention by a method and a suitable condensation dryer with the features of each corresponding independent claim.
  • Preferred embodiments of the method according to the invention and of the condensation dryer according to the invention are listed in the respective dependent claims.
  • Preferred embodiments of the method according to the invention correspond to preferred embodiments of the condensation dryer according to the invention and vice versa, although this is not explicitly stated herein.
  • the amount m of condensate is determined as the amount of condensate collected in the condensate pan to a predetermined level. This level may be determined by a level sensor or level-dependent switch which, upon reaching this level, switches a condensate pump through the water collected in the condensate tray, which then pumps the accumulated water.
  • the beginning of the process according to the invention generally takes place at the same time as the initiation of a drying program.
  • a heater and a blower are turned on to direct heated process air for drying wet laundry in the drum.
  • the properties of items of laundry according to the invention comprise a degree of moisture and a loading amount.
  • the degree of moisture of the laundry changes during a drying process, since first evaporates surface water and finally pore and capillary water from the fabric of the laundry.
  • the course of a degree of moisture in a drying process is different and a continuous and accurate determination of a degree of moisture therefore advantageous for a laundry and energy efficient drying of the laundry, as well as a precise control of the final moisture content with respect to a given Values such as "iron-dry".
  • the properties of items of laundry according to the invention also include a loading amount.
  • a determined loading amount refers to the dry matter the laundry items to be dried placed in the drum.
  • items of laundry have a moisture content, based on the dry weight of the items of laundry, for example of about 60% after a washing process and spinning at 1200 rpm.
  • different loading volumes behave differently in a drying process. For example, a full-load drying process may be longer than a half-load drying process. Likewise, the duration of the individual phases passed through in the drying process can be different.
  • properties of items of laundry are determined by a relationship stored in a control device for different values of a period ⁇ t n with n ⁇ 1.
  • the period .DELTA.t n is the period required for the condensation of a quantity m set1 of water from warm, moist process air, wherein the time period .DELTA.t n by evaluating a pumping cycle of a condensate pump can be measured that the collected in the condensate tray condensate for intermediate storage or for Pumps disposal.
  • a pumping cycle comprises at least one operating phase and a rest phase of the pump, wherein an operating phase is characterized by the pumping of condensate and a rest phase by a standstill or a state of low operating power without delivery.
  • the length of a rest pause of a condensate pump is used as a measure for the period ⁇ t n .
  • the operating phase of the pump is generally initiated when at least one liquid sensor located in the condensate tray responds.
  • an operating phase of the condensate pump is initiated when in the condensate pan a predetermined maximum water level H max1 is reached, and the operating phase takes so long until the predetermined amount m set1 is pumped out of water and thereby a minimum water level H min is reached.
  • the length of a rest pause of a flow sensor in a condensate channel is used as a measure of ⁇ t n additionally or alternatively to the evaluation of the rest period of a condensate pump.
  • the type of flow sensor is not limited.
  • a flow sensor measures a volume flow of aqueous liquid per unit time. The flow sensor responds and sends a sensor signal to the controller as condensate flows past the condensate channel past the flow sensor. This is the case when the operating state of the pump is initiated. When the pump enters the idle phase, condensate no longer flows through the condensate channel and past the flow sensor, and the sensor no longer transmits a sensor signal to the control device.
  • the sensor signal of the flow sensor can thus be measured alternatively or additionally by the time measuring device and from this a time period ⁇ t n can be determined.
  • liquid sensor as used herein means a sensor or sensor system that can detect the presence of aqueous liquid.
  • response used herein means that a sensor signal emanating from the sensor indicates the presence of an aqueous fluid.
  • the liquid sensor is a water level sensor or a system of water level sensors. According to the type of water level sensor is not limited.
  • the water level sensor may be, for example, a sensor with reed contact and float, an optical sensor or a conductivity sensor. Different types of sensors can be combined with each other.
  • a conductivity sensor in the height H max1 is arranged in the condensate tray .
  • the condensate accumulating on the heat exchanger during the drying process is collected and collected in the condensate tray. If the level of the condensate reaches the height H max1 , in which the conductivity sensor is arranged, it responds. Via a control device, the sensor signal is evaluated and initiated an operating phase of the pump.
  • the pump then generally transfers the condensate from the condensate tray through a so-called condensate channel to a caching container, also referred to herein as the "condensate container", or for disposal in a sewer.
  • the pump goes into the idle phase until the level H max1 is reached again by the incoming condensate.
  • the rest phase of the pump can be initiated for example by means of a second water level sensor at the height H min or by another device.
  • a third conductivity sensor is additionally arranged at a height H max2 , which is lower than the height H max1 , wherein the conductivity sensor at H max2 can be activated independently of the conductivity sensor at H max1 by a control device.
  • activated means that the sensor responds in the presence of aqueous fluid.
  • a relationship is established between a time period ⁇ t n measured by the time measuring device for the condensation of an amount m set of water from moist-warm process air and the properties of the laundry items in the drum.
  • the quotient Q ⁇ 1 since in this phase, the production of condensate is not constant and increases with time.
  • the process air which is generally passed through the laundry items by means of a blower has not yet reached the prescribed process temperature. Therefore, the amount of water, which is absorbed by the dry-heat process air in the drum with laundry items. Thus, the amount of water that condenses in the heat exchanger from the moist, warm process air also increases.
  • a predetermined in the condensate tray level, for example, H max1 , and a corresponding predetermined amount of condensate, for example m set1 is reached faster and the operating state of the pump initiated faster.
  • the measured period ⁇ t n shortens, ⁇ t n > ⁇ t n + 1 .
  • a first phase of the main drying phase the quotient Q is equal to 1.
  • This phase is referred to as a stationary phase, since here the condensation generation proceeds constantly under constant conditions.
  • Evaporated in the stationary phase Surface water from the laundry in the drum.
  • a fill level predetermined in the condensate tray for example H max1
  • an associated predetermined amount of condensate for example m set1 .
  • This phase is called the transient phase.
  • condensate production decreases over time.
  • a predetermined in the condensate tray level, for example, H max1 , and a corresponding predetermined amount of condensate, for example m set1 is increasingly reached later and the operating state of the pump initiated later.
  • the measured period ⁇ t n becomes larger, so that ⁇ t n ⁇ t n + 1 holds.
  • the predetermined amount m for the condensation of water is reduced to a value m set2 ⁇ m set1 .
  • the number of pump cycles and thus the number of measured values for ⁇ t n increases , which increases the accuracy of the measurement in the transient phase.
  • This is advantageous since, in particular toward the end of the drying process, the degree of moisture of the items of laundry is close to the predetermined residual moisture level and accurate determination of the degree of moisture permits a targeted termination of the drying process.
  • the method is carried out until Q reaches a predetermined value Q set1 as a measure of a residual moisture content of the laundry items has, wherein for determining the residual moisture, a stored in the control device relationship between Q and the residual moisture of the laundry is used.
  • the invention allows that when a predetermined value Q set2 for Q, a power of the heater is lowered or the heater is even turned off.
  • the method according to the invention can be made even more energy-efficient and even more laundry-friendly.
  • the first period .DELTA.t 1 is evaluated as a measure of the loading of the drum with laundry, wherein for the evaluation stored in the controller relationship between .DELTA.t 1 and the loading of the drum is used with laundry.
  • this also a kind of laundry and thus the fibers are taken into account.
  • loading means the dry mass of the laundry items to be dried introduced into the drum.
  • the initiation of the first pumping cycle is delayed in time as the loading of the laundry drum becomes smaller. For example, garments having 1200 rpm. were spun in a washing machine, a residual moisture of 60% water. If a semi-load condensation dryer is operated at full load compared to a full-load condensation dryer, the first initiation of the semi-load pump cycle will be delayed for a period of 3 to 4 minutes, for example.
  • liquid sensor is not limited, it may for example be a sensor with reed contact and float, an optical sensor or a conductivity sensor.
  • a first water level sensor in the height H max1 and a second water level sensor in the height H min are arranged as a liquid sensor in the condensate tray such that a level difference between the first and second water level sensor corresponds to an amount m 1 of condensate.
  • a third water level sensor in the height H max2 is then arranged in the condensate tray , wherein a level difference between the second and third water level sensor corresponds to an amount m 2 ⁇ m 1 of condensate.
  • a condensate pump is arranged in the condensate tray or in a condensate tray connected to the condensate tray.
  • a flow sensor is arranged in a condensate channel connected to the condensate tray.
  • the condensate tray is generally connected via a so-called condensate channel with a container for intermediate storage of the condensate, ie a condensate tank, or with a sewer pipe for disposal of the condensate.
  • a container for intermediate storage of the condensate ie a condensate tank, or with a sewer pipe for disposal of the condensate.
  • the condensate pan is arranged in the bottom group of the condensation dryer is and the condensate is removed against gravity, it is arranged in the condensation dryer according to the invention generally in the condensate pan or in the condensate channel, a condensate pump.
  • the condensation dryer according to the invention furthermore generally has a heater, in particular an electric heater or a gas heater, wherein an electric heater is preferably used.
  • the heater serves to heat the process air before it is introduced into the drum of the condensation dryer.
  • the condensation dryer according to the invention generally also has a temperature sensor, which is arranged to measure the process air temperature in a process air duct or a cooling air duct.
  • the condensation dryer For conveying the process air, the condensation dryer also generally has a fan in the process air duct.
  • the condensation dryer according to the invention which can be designed as an exhaust air or circulating air dryer, at least one heat exchanger for dehumidifying the moist, warm process air is present. This is generally achieved by cooling the moist, warm process air.
  • the heat exchanger generally uses a cooling medium, for example cooling air or a refrigerant, for dehumidifying the process air.
  • the heat exchanger is in particular an air-air heat exchanger or a heat sink of a heat pump, in particular an evaporator.
  • a heat pump is characterized by two heat exchangers, namely a heat sink, in which heat is absorbed, a heat source in which heat is released, and a pumping device, which transfers heat from the heat sink to the heat source optionally with a change in temperature.
  • the cooling of the warm, moisture-laden process air takes place essentially in the heat sink of the heat pump, also referred to as evaporator, where the heat transferred is used to evaporate a refrigerant circulating in the pump device designed as a circuit ,
  • the evaporated because of the warming Refrigerant is supplied in the pumping device via a compressor of the heat source, which is a condenser for the refrigerant, the heat pump, where heat is released due to the liquefaction of the gaseous refrigerant.
  • the then liquid refrigerant is expanded in a throttle of the pumping device, whereby its internal pressure is reduced, and finally passes back to the evaporator.
  • the condensation dryer according to the invention is located in the process air duct preferably an air-to-air heat exchanger or an evaporator of a heat pump. If an air-air heat exchanger is used, preferably a cooling air duct is present therein, through which comparatively cool air, in particular from an installation space of the dryer, is passed as the cooling medium by means of a cooling air blower.
  • the condensation dryer according to the invention is in particular a tumble dryer per se or a washer-dryer.
  • a washer-dryer here is a combination device that has a washing function for washing laundry and a drying function for drying wet laundry.
  • the dryer advantageously has an optical and / or acoustic display device for different states of the dryer.
  • an optical display device is preferably used.
  • the display device can give information about the operation of the dryer, for example, by the number or selection of active water level sensors, for example by outputting a text or by lighting different colored light emitting diodes, ie an accuracy of the evaluation of At n , on the loading amount, the phase of the drying process, for example, heating phase, stationary phase, transient phase or the remaining time of a running drying program.
  • laundry properties such as loading and moisture level
  • the load can be determined very early, already in the heating phase.
  • the degree of humidity and the final moisture level which is predetermined by the user's choice of program, are precisely determinable in embodiments of the invention, in particular by the variable adaptation of the condensate quantities m set .
  • the method according to the invention thus allows an individual, energy-efficient and laundry-friendly implementation of a drying process adapted to the requirements of the user.
  • Fig. 1 in particular shows a vertical section through a condensation dryer 1 according to a first embodiment, which as a heat exchanger 15 for dehumidifying the process air, the evaporator 15 of a heat pump 12, 13, 14, 15 and a rotatable about a horizontal axis drum 3 as a drying chamber, within which driver 21 are attached to the movement of laundry during a drum rotation.
  • the arrowheads with filled tip indicate the flow direction of the process air.
  • process air is conducted via an electric heater 4 with the aid of a process air blower 6. The thereby heated process air then passes into the drum 3, where in Fig. 1 Moist laundry items not shown are deprived of moisture.
  • the heated from the electric heater 4 process air from the rear, ie from a dryer door 22nd opposite side of the drum 3, passed through the perforated bottom in the drum 3.
  • the moist, warm process air leaves the drum 3 via a fluff grate 31 and flows in the process air duct 2 to the evaporator 15 of the heat pump.
  • a circulating in the heat pump circuit 12, 13, 14, 15 refrigerant is evaporated due to the heat exchange with the moist, warm process air and fed via a compressor 13 to a condenser 12.
  • the moist, warm process air is thereby cooled in the evaporator 15 of the heat pump 12, 13, 14, 15 and the evaporated refrigerant of the heat pump via a compressor 13 to the condenser 12, where the refrigerant with heat dissipation to the flowing in the process air duct 2 cooled and dehumidified Process air liquefies.
  • the liquid then present in liquid form is passed via a throttle valve 14 in turn to the evaporator 15, whereby the refrigerant circuit is closed.
  • the arrowheads with the tip not filled indicate the flow direction of a refrigerant in the heat pump.
  • a condensate tray 17 is mounted below the evaporator 15, which absorbs the water condensing in the evaporator 15 from the moist, warm process air.
  • a condensate pump 20 in a condensate channel 18 the collected condensate is pumped into a condensate tank 19.
  • a liquid sensor 11 which here is a system of at least two water level sensors otherwise not shown in detail, for which purpose conductivity sensors are used.
  • a conductivity sensor should be located at a height H max1 .
  • the condensate pump 20 is triggered when the liquid sensor 11 responds upon reaching the level height H max1 .
  • the condensate pump 20 can be controlled so that it interrupts their operation falls below a predetermined minimum level H min .
  • From operating phase and rest phase of a pumping cycle period .DELTA.t n can be determined, according to the invention as a measure of the length of an n .DELTA.t
  • the condensate pump is used twentieth
  • the response and silence of the flow sensor 32 in the condensate channel 18 can be used to determine the period .DELTA.t n , in particular a rest of the flow sensor 32, which generally corresponds to a rest break of the condensate pump 20.
  • the drum 3 is at the in FIG. 1 shown embodiment at the rear bottom by means of a pivot bearing and front mounted by means of a bearing plate 7, wherein the drum 3 rests with a brim on a sliding strip 8 on the bearing plate 7 and is held at the front end.
  • the control of the dryer via a control device 10, which can be controlled by the user via an operating unit 9.
  • a display device 33 allows the display of a residual maturity of the drying process with respect to a user selected residual moisture value, such as ironing dry, or the display of the determined load or other conditions of the dryer or the display of the status of the drying process, for example in color differentiated form.
  • the dryer for determining the residual moisture of the items of laundry and the load on the controller 10 the liquid sensor 11, the condensate pump 20 and the flow sensor 32 in the condensate channel 18 and a time measuring device 5.
  • the conductivity sensor 11 sends a signal to the control device 10, which triggers an operating phase of the condensate pump 20.
  • the condensate pump 20 pumps the condensate from the condensate pan 17 via the condensate line 18 into the condensate tank 19.
  • the condensate pump 20 interrupts its operation.
  • the time measuring device 5 starts timing in the present first embodiment when a drying program is started.
  • the loading of the drum 3 with laundry items can be determined, for evaluation, a stored in the controller 10 relationship between .DELTA.t 1 and the loading of the drum 3 is used with laundry.
  • the time measurement by means of the time measuring device 5 can in principle be continuous or discontinuous, but in the present case at least one rest period of the condensate pump 20 or the flow sensor 32 is evaluated. Preferably, therefore, a time measurement takes place exclusively during one or more rest periods.
  • the predetermined amount m for the condensation of water is reduced to a value m set2 ⁇ m set1 . This achieves a relative reduction in the length of the rest periods of the condensate pump 20 and achieves an improved accuracy of the method overall by way of a relative increase in the number of evaluable rest pauses.
  • the method according to the invention is carried out until Q has reached a value Q set1 directly or indirectly predetermined by a user as a measure of a residual moisture content of the items of laundry, whereby a relationship stored in the control unit 10 for determining the residual moisture Q and the residual moisture of the laundry is used.
  • a power of the heater 4 can advantageously be reduced for Q when a predetermined value Qset2 is reached.
  • FIG. 2 shows in a section a vertical section through the condensate pan 17 of a second embodiment of a condensation dryer, not shown in detail.
  • H max1> H max2> H min is in the drain pan 17 three conductivity sensors 11a, 11b and 11c in the filling heights H max1, H min and H.
  • the conductivity sensors 11a and 11c can be independently activated or deactivated via the control device 10. In this way, two different sets m set1 and m set2 can be specified for condensate with m set1 > m set2 .
  • the operating phase of the condensate pump 20 is already introduced at a lower level of condensate. This increases the number of pump cycles and more values for ⁇ t n can be measured, which increases the moisture level the items of laundry can be more accurately determined via the stored in the control device 10 context.
  • 18 here means a condensate channel for the discharge of condensate in the direction of arrow to a sewer or a condensate tank for temporary storage.
  • the arrowhead shows in particular the flow direction of the condensate during a pumping operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)
EP16700074.4A 2015-02-03 2016-01-07 Verfahren zur ermittlung von wäscheeigenschaften und hierfür geeigneter kondensationstrockner Active EP3253914B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16700074T PL3253914T3 (pl) 2015-02-03 2016-01-07 Sposób określania właściwości prania i suszarka kondensacyjna odpowiednia do tego sposobu

Applications Claiming Priority (2)

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DE102015201831.8A DE102015201831A1 (de) 2015-02-03 2015-02-03 Verfahren zur Ermittlung von Wäscheeigenschaften und hierfür geeigneter Kondensationstrockner
PCT/EP2016/050168 WO2016124349A1 (de) 2015-02-03 2016-01-07 Verfahren zur ermittlung von wäscheeigenschaften und hierfür geeigneter kondensationstrockner

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EP3253914B1 true EP3253914B1 (de) 2019-09-04

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CN111455608B (zh) * 2020-04-08 2022-07-05 珠海格力精密模具有限公司 一种洗衣机、洗衣控制方法、装置和存储介质

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Also Published As

Publication number Publication date
CN107208350B (zh) 2019-06-11
PL3253914T3 (pl) 2020-04-30
CN107208350A (zh) 2017-09-26
EP3253914A1 (de) 2017-12-13
DE102015201831A1 (de) 2016-08-04
WO2016124349A1 (de) 2016-08-11

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