EP3191638A1 - Sèche-linge à condensation comprenant un capteur de température, et procédé de fonctionnement correspondant - Google Patents

Sèche-linge à condensation comprenant un capteur de température, et procédé de fonctionnement correspondant

Info

Publication number
EP3191638A1
EP3191638A1 EP15754237.4A EP15754237A EP3191638A1 EP 3191638 A1 EP3191638 A1 EP 3191638A1 EP 15754237 A EP15754237 A EP 15754237A EP 3191638 A1 EP3191638 A1 EP 3191638A1
Authority
EP
European Patent Office
Prior art keywords
components
condensation dryer
monitored
dryer
process air
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
EP15754237.4A
Other languages
German (de)
English (en)
Other versions
EP3191638B1 (fr
Inventor
Marcus Simon
Johannes EICHSTÄDT
Maike Blanken
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 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 Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP3191638A1 publication Critical patent/EP3191638A1/fr
Application granted granted Critical
Publication of EP3191638B1 publication Critical patent/EP3191638B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
    • 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
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • 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
    • D06F2103/54—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to blowers or fans
    • 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
    • D06F2103/64—Radiation, e.g. microwaves
    • 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
    • D06F2105/26—Heat pumps
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/62—Stopping or disabling machine operation
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/28—Arrangements for program selection, e.g. control panels therefor; Arrangements for indicating program parameters, e.g. the selected program or its progress
    • 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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • 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 
    • D06F58/206—Heat pump 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
    • 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
    • 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 condensation dryer with a drum for objects to be dried, a drive motor for the drum, a process air duct, a process air blower, a process air heating and cooling system, a temperature sensor and a control device.
  • the invention also relates to a method for operating such a condensation dryer.
  • the invention particularly relates to a condensation dryer (also referred to herein as a "dryer" for short) comprising a drum for articles to be dried, a drum drive motor, a process air duct, a process air blower, a process air heating and cooling system, a temperature sensor and a control device and a preferred method for its operation.
  • a condensation dryer air (so-called process air) is passed through a fan via a heater in a wet laundry containing drum as a drying chamber.
  • the hot air absorbs moisture from the laundry to be dried.
  • the then moist, warm process air is led into a heat exchanger, which is usually preceded by a lint filter.
  • the moist process air is cooled so that the water contained in the moist process air condenses.
  • the condensed water is then generally collected in a suitable container and the cooled and dried air is again supplied to the heater, which may optionally be the heat source of a heat pump, and then to the drum.
  • a heat pump using a refrigerant as a heat transporting means wherein the refrigerant in the heat sink is evaporated and liquefied in the heat source
  • the vaporized gaseous refrigerant passes through a compressor to the heat source, which may be referred to as a condenser.
  • the liquefied refrigerant eventually flows through a throttle back to the evaporator; the throttle is used to reduce the internal pressure in the refrigerant, so that it can evaporate in the evaporator with renewed absorption of heat.
  • the heat pump which is thus operated with a circulating refrigerant, is also known as a "compressor heat pump.”
  • Other types of heat pump are also known.
  • the traditionally used air-to-air heat exchanger and the electric heater can generally be completely replaced by a heat pump. As a result, compared to a dryer with air-to-air heat exchanger and resistance heating, a reduction of the energy requirement for a drying process of 20% to 50% can be achieved.
  • a compressor heat pump usually works optimally in certain temperature ranges in the evaporator and in the condenser.
  • the problem with the use of a compressor heat pump in the condenser dryer is the usually high temperature in the condenser, which, as a result of the process, can cause the refrigerant to no longer or no longer be completely liquefied; then the compressor must be switched off and / or a significantly deteriorated effect of the heat pump can be accepted.
  • This problem is even greater if the compressor is supported by additional heating in the process air circuit in order to achieve faster heating of the process air and thus shorter drying times.
  • contamination of the air passages may hinder the circulating process air and thus increase the temperature of the refrigerant come.
  • Such operating conditions can lead to damage to the heat pump or other parts of the dryer and are therefore inadmissible. It is therefore useful to monitor the temperature in the heat pump cycle and especially the components of the heat pump cycle.
  • an impermissible operating state for example a reduced circulation of the process air (air power reduction) is determined by detecting a temperature in the process air stream above a heater for the process air and in front of the drying chamber at regular intervals and in each case from two consecutively detected values a difference value is formed, which corresponds to a temporal gradient.
  • This information generally need not be available in this form for a dryer equipped with a heat pump (heat pump dryer).
  • heat pump dryer the heat pump is often farther from the drying chamber than the heater in a conventional condensation dryer.
  • the detection of an impermissible operating state in a condensation dryer, which is equipped with a heat pump in this way only inaccurately possible.
  • DE 197 28 197 A1 discloses a method for detecting impermissible operating states in a tumble dryer and a corresponding tumble dryer. With the method, it should be possible to separately or collectively detect different operating conditions of too high temperature, which originate from different areas.
  • the temperature is detected periodically in the supply air above a Zu Kunststoffdorfung and before the laundry drum, formed from two successively detected values, a difference value or gradient and this difference value (gradient) compared with a predetermined differential value (gradient).
  • a count is incremented by one step if the newly formed difference value is absolutely greater than the predetermined difference value and that count value is compared to a predetermined count value. If the current count value is greater than the predetermined count, the heater of the clothes dryer is turned off and / or an operating status display is activated.
  • WO 2008/086933 A1 discloses a condensation dryer with a drying chamber, a process air circuit in which there is a heater for heating the process air and the heated process air by means of a blower over the zu drying objects, an air-to-air heat exchanger and a heat pump cycle with an evaporator, a compressor and a condenser.
  • an additional heat exchanger In the heat pump circuit is located between the condenser and evaporator, an additional heat exchanger, which is operatively coupled to the air-air heat exchanger.
  • the temperature of the refrigerant of the heat pump, in particular in the condenser is kept within the permissible range via the control of heat pump and additional heat exchanger.
  • temperature sensors are used to control the temperature of refrigerant or heat pump and the temperature of the process air in the heat pump circuit and / or in the process air circuit.
  • EP 1 593 770 A2 describes a clothes dryer with a drying chamber, a heat pump mechanism in which a refrigerant can circulate between a heat absorber, a compressor, a throttle unit and a heat radiator, and an air circulation path for the circulation of drying air from the drying chamber through the heat absorber and the heat radiator back to the drying chamber.
  • a refrigerant can circulate between a heat absorber, a compressor, a throttle unit and a heat radiator, and an air circulation path for the circulation of drying air from the drying chamber through the heat absorber and the heat radiator back to the drying chamber.
  • an air discharge part is arranged between the drying chamber and the heat absorber, so that a part of the drying air flowing through the air circulation path from the drying chamber to the heat absorber is carried outside through the air discharge part.
  • the temperature of the refrigerant is measured and controlled so as to remain within a predetermined range.
  • DE 10 2010 000 427 A1 describes an automatic clothes dryer for drying laundry after a dry cycle, comprising: a rotating drum enclosing a drying chamber; an air supply system in fluid communication with and communicating with the drying chamber; a heating system with which the air to be supplied by the air supply system can be heated; an output system for dispensing treatment chemistry of a particular type and amount; an imaging device with which the drying chamber representing image data can be output; and a controller operatively connected to the air supply, heating, and dispensing systems, and the imaging device, adapted to determine from the image data the presence of a drying tray in the drying chamber and to control the operation of the dryer due to the presence of the drying tray ,
  • the imaging device may be a thermal imaging device that can detect radiation in the IR region of the electromagnetic spectrum, with the imaging device disposed on the rear or front bulkhead or in the door.
  • a dryer for drying at least one object comprising: a dryer housing, in which a drying space for receiving the at least one object is provided, in particular a heater for heating the drying space, an infrared-sensitive measuring element for non-contact spectroscopic measurement of the surface temperature of the object provided in the drying space and output of a surface temperature signal, and a control arrangement with a first control device for receiving the surface temperature signal from the infrared-sensitive measuring element and in particular a second control device for controlling the heating, wherein the control arrangement includes at least the surface temperature signal to a degree of moisture of the at least one object.
  • WO 2001/046509 A1 describes a device for treating textiles with a device for detecting properties of a textile, wherein the device comprises at least one transmitting and at least one receiving element for transmitting or receiving electromagnetic radiation as well as an evaluation circuit connected to the receiving element, wherein the radiation emitted by the transmitting element and reflected and / or transmitted by the textile is receivable by the receiving element and can be evaluated in the evaluation circuit.
  • the object of the invention was to provide a condensation dryer and a method for its operation in which the temperature of the components of the dryer can be monitored in a simple manner in order to optimize the control of the dryer and, in particular, the course of a drying program to improve.
  • the invention should also be particularly suitable for a condensation dryer with a heat pump, so that preferably the control of the components of a heat pump in a manner possible to optimize the flow of a drying program in a heat pump dryer.
  • the solution of this object is achieved according to this invention by a condensation dryer and a method having the features of the corresponding independent claim.
  • Preferred embodiments of the condensation dryer according to the invention and of the method according to the invention are listed in corresponding dependent claims.
  • Preferred embodiments of the condensation dryer according to the invention correspond to preferred embodiments of the method according to the invention and vice versa, even if not explicitly mentioned herein.
  • the invention thus relates to a condensation dryer with a drum for objects to be dried, a drive motor for the drum, a process air duct, a process air blower, a heating and cooling system for the process air, a Temperature sensor and a control device.
  • the temperature sensor is an infrared telescope and arranged for the simultaneous measurement of thermal radiation of at least two to be monitored components of the condensation dryer.
  • a simultaneous measurement of thermal radiation of at least three, and more preferably of at least four components is performed.
  • the component "process air duct" can in turn be subdivided into several separate sections to be monitored.
  • the components to be monitored are selected from the group comprising an outer surface of the drum, the process air duct, the components of the heating and cooling system, the process air blower and the drive motor.
  • the infrared telescope contains a thermopile array.
  • thermopile array is an array of thermopiles, also known as “thermopiles", which convert thermal energy into electrical energy, and a thermopile generally consists of several thermocouples that are thermally connected in parallel and electrically in series, thereby generally producing thermocouples
  • the thermopile array is directed into the interior of the dryer and absorbs the IR radiation emitted by the components.
  • the thermopile array is advantageously covered with silicon that is permeable to IR radiation, sealed in a vacuum-tight manner and to environmental conditions such as precipitating moisture or water vapor, etc.
  • thermopile is advantageous, in particular, a membrane formed by thinning out a semiconductor region with interconnects made of materials having different Seebeck coefficients which contacts the membrane and with an absorption medium absorbing infrared radiation l are covered. Incident IR radiation heats the Absorption material and thus the contact area of the tracks on the membrane, so that a thermoelectric voltage is obtained as a measurement signal.
  • a membrane allows a good thermal insulation compared to the bulk material of the thermopile array and thus a clear, high measurement signal.
  • thermopile array an imaging optics for generating an image of a respective measurement point of each of the components to be monitored on the sensor array of the infrared telescope, in particular the thermopile array itself, is provided.
  • each measuring point comprises a coating which has a predetermined emission coefficient for the heat radiation.
  • the measuring point on the component comprises a coating which makes it possible to set an emission coefficient for the thermal radiation predetermined for the component.
  • the imaging optics is, in particular, a passive optical system which on the one hand enables a diaphragm function for alignment with only the selected components and prevents interference radiation and preferably also provides optical alignment or focusing for signal amplification.
  • optical windows of relevant wavelength ranges of the infrared radiation can be defined by the passive optical system in which, for example, moisture in the dryer does not or does not substantially absorb the heat radiation emitted by the components or the measuring points of the components.
  • different optical windows can be defined. It is considered particularly favorable if, in the condensation dryer according to the invention, each component to be monitored is assigned a respective thermopile of the thermopile array, so that the heat radiation of the respective component to be monitored is measured by the respective associated thermopile.
  • the control device is set up to evaluate the thermal radiation respectively measured by the infrared telescope for the components, ie IR radiation, for the monitoring and / or control of the condensation dryer, in particular of its components such as the process air blower.
  • the values of the measured IR radiation can be directly evaluated by the control device or first converted into temperatures.
  • the relationships which are important for monitoring and / or controlling the dryer are, on the one hand, the values of the measured IR radiation or the temperatures determined therefrom and, on the other hand, the actions to be taken for particular values on components or their settings, eg number of revolutions of the process air blower or the drum, deposited in the controller.
  • appropriate empirical values or calibration measurements can be used.
  • a calibration measurement or reference measurement can be made with a reference object in the dryer, so that specific errors or deviations of the actually used thermopile array or its thermopiles are taken into account and changes to this reference measurement eg at different temperatures of the drying room at subsequent Calculations can be used.
  • the term "actions" may in this case include an indication of a display device that certain temperatures are outside an admissible range and indicate an impermissible operating state or at least a non-optimized sequence of a drying program.
  • the heating and cooling system for the process air includes a heat pump with an evaporator, a compressor, a condenser and a throttle as components.
  • the components whose heat radiation is measured by the infrared telescope include the evaporator, the compressor, the condenser and / or the throttle.
  • Particularly preferred then include the components whose heat radiation is measured by the infrared telescope, the condenser and the compressor.
  • the throttle may in particular be an expansion valve (also referred to as a throttle valve), a capillary or a diaphragm.
  • the compressor can be one with a fixed power, which can thus be controlled only by switching on and off, or be a variable-power compressor.
  • the compressor is a variable-power compressor.
  • the variable-power compressor may be operated at a power P depending on the values of the infrared telescope, so that the temperature of a refrigerant in the heat pump cycle is within a range T K M 1 ⁇ T K M ⁇ T K M 2 .
  • a temperature T R in the installation space AR can also be measured with a temperature sensor S T AR, if necessary with the thermopile array itself, and taken into account for the control of the variable-power compressor.
  • a speed-regulated compressor is preferably used whose speed ⁇ ⁇ varies as a function of the measured values of the infrared telescope and possibly the temperature T R measured in embodiments.
  • a rotational speed ⁇ ⁇ of a variable-speed compressor in dependence on the measured temperature T R with reference to a stored in the control unit relationship between the rotational speed ⁇ ⁇ and the measured temperature T R varies with the rotational speed ⁇ ⁇ with increasing temperature T R decreases.
  • the compressor used in embodiments of the dryer according to the invention is not particularly limited. Suitable compressors are, for example, screw compressors and rotary piston compressors. According to the invention, the compressor used is preferably a rotary piston compressor.
  • the components to be monitored by means of the infrared telescope must be located in the field of vision of the infrared telescope, whereby "visual range" is to be interpreted broadly, if necessary by an existing imaging optics, which can be directed at the space to be monitored and conducts the heat radiation of the component suitably , be extended.
  • each component is assigned a single sensor of the infrared telescope, so that the thermal radiation of the respective component is measured by the associated sensor.
  • the infrared telescope for measuring heat radiation of the outer drum surface, i. of the drum shell arranged. This makes it possible to follow a drying program and, in particular, moisture levels of the items to be dried can be monitored.
  • condensation dryer in which the control device is set up in order to take account of different emission levels of the components is preferred.
  • the emissivities can be adjusted to a certain extent by a suitable selection and design of the measurement points. In general, use is made of the fact that metal surfaces have only a very small emission coefficient, but the emission coefficient of other materials is generally greater.
  • respective maximum permissible values for the thermal radiation of the components to be monitored are stored in the control device and the control device is set up to switch off the condensation dryer when a maximum permissible value for the thermal radiation of the components is exceeded and / or exceeding the condensation dryer maximum permissible value on a display device of the condensation dryer.
  • the condensation dryer according to the invention preferably has an acoustic and / or optical display means for displaying an operating state, for example an impermissible operating state.
  • An optical display means may be, for example, a liquid crystal display on which certain prompts or hints are given. It may also or alternatively light LEDs in one or more colors light up.
  • the type of display of an operating state can be dependent on the type of operating state, for example permissible or inadmissible.
  • a request to clean the air passages in the condenser dryer could be indicated.
  • Alternatively or in addition to this could light up a light-emitting diode, for example in the color "orange".
  • a second impermissible operating state which is generally critical, for example, an indication that the drying process has been interrupted, the refrigerant circuit checked and / or a service technician to turn on, could be indicated on a liquid crystal display. Alternatively or in addition to this could light up a light-emitting diode, for example in the color "red".
  • the display could also be made via an acoustic display, with different impermissible operating states could be displayed by different beeps.
  • the display is not limited to the display of impermissible operating conditions.
  • remaining drying time could also be displayed whether or to what extent the refrigerant temperature is in an optimal range.
  • an additional heat exchanger may advantageously be arranged in the heat pump, an additional heat exchanger.
  • the additional heat exchanger is arranged in a process air channel between the evaporator and the condenser.
  • the additional heat exchanger is arranged in a cooling air duct.
  • an air-air heat exchanger is arranged in this cooling air duct.
  • the condensation dryer according to the invention preferably comprises a second blower for cooling the heat pump cycle.
  • the second blower is preferably arranged in a cooling air duct and / or the surroundings of the compressor.
  • the heating of the process air can take place in the embodiment as a heat pump dryer exclusively via the condenser of the heat pump. However, it can also be used in addition to an electric heater.
  • a further heater is used in the condensation dryer according to the invention, this is preferably a two-stage heater.
  • the control of this heater is also used in a preferred embodiment of the invention for controlling the temperature of the refrigerant.
  • a cooling device for the heat pump may be used, which preferably comprises a second fan.
  • the second blower can be used directly for cooling components of the heat pump, in particular the compressor.
  • the second fan and an additional heat exchanger are arranged in a cooling air passage, wherein the additional heat exchanger in the heat is located pump.
  • the cooling air duct may still be another air-to-air heat exchanger.
  • the possibly present air-air heat exchanger is removable. This is particularly advantageous because a removable heat exchanger can be cleaned more easily from lint.
  • the condenser dryer As the degree of drying of the objects to be dried in the condenser dryer decreases the energy required for drying, it is appropriate to regulate the heating accordingly, that is. As the degree of dryness progresses, their heating power is reduced to maintain a balance between the supplied and necessary drying energy.
  • the invention also relates to a method for operating a condensation dryer with a drum for objects to be dried, a drive motor for the drum, a process air duct, a process air blower, a process air heating and cooling system, a temperature sensor and a control device.
  • temperature sensor is an infrared telescope and for the simultaneous measurement of thermal radiation of at least two components to be monitored condensation dryer, and thereby the heat radiation of the at least two components to be monitored by means of the infrared telescope and measured by the control device with respect to the respective temperature of the components to be monitored evaluated and used for monitoring and / or control when operating the condensation dryer.
  • the components comprise the components of the heating and cooling system, wherein the components whose heat radiation is measured by the infrared telescope, the evaporator, the compressor, the condenser and / or the throttle of a heat pump, and the control of the Condensation dryer is carried out so that the temperature of the refrigerant is within a predetermined range.
  • the predetermined range depends in particular on the nature of the refrigerant.
  • a method is preferred in which the control of the condensation dryer takes place in that the power of a variable-power compressor is varied so that the temperature of the refrigerant is within a predetermined range.
  • a drying program running in the condensation dryer can be better monitored with regard to the moisture content of the laundry items in the drum.
  • the loading amount with laundry items are taken into account by a relationship between the heat radiation or the temperature of the outer drum surface and the moisture content of the laundry items is stored in the control device for different load levels.
  • the invention has numerous advantages. This enables central monitoring of the temperatures of the individual components of a condensation dryer, for example a heat pump dryer.
  • a single global temperature sensor namely an infrared telescope, is used instead of generally a plurality of individual temperature sensors located at different locations in the condensation dryer.
  • information about the temperature of evaporator, condenser, compressor and throttle and the connecting pipes of the heat pump can be obtained, so that the heat pump and thus the condensation dryer can be better controlled.
  • a variable-capacity compressor in which a variable-capacity compressor is used, so the performance of the compressor can be selectively varied so that the operation of the heat pump in an optimal temperature range can. This allows the operation of the condensation dryer with a particularly favorable energy balance.
  • the heat pump is spared. Similar advantages also arise when the dryer instead of a heat pump includes an electric heater or gas heater and an air-to-air heat exchanger. Again, a central monitoring of the temperature of the individual components is advantageous.
  • the evaluation of the heat radiation from the drum shell, i. the outer drum surface, the course of a drying program and thus the setting of a Wäschefeuchte be tracked and controlled.
  • the invention also illustrates the use of an intelligent system or of infrared technology and thus ultimately a high degree of innovation of the dryer according to the invention.
  • Impermissible operating states can be reliably displayed so that suitable countermeasures can be taken.
  • FIGS. 1 to 3 Further details of the invention will become apparent from the following description of non-limiting embodiments of the condensation dryer according to the invention and a method using this condensation dryer. Reference is made to FIGS. 1 to 3.
  • FIG. 1 shows a perspective view of the invention essential parts of a condensation dryer according to a first embodiment, which is here a heat pump dryer.
  • Fig. 2 shows a vertical section through a condensation dryer according to a second embodiment, which is also a heat pump dryer here.
  • FIG. 3 shows a vertical section through a condensation dryer according to a third embodiment, which is designed as a condensation dryer with an air-air heat exchanger.
  • 1 shows a perspective view of the invention essential parts of a condensation dryer according to a first embodiment, which is a heat pump dryer 1. Shown in Fig. 1, the drum 2 with an outer drum surface 5 and the components of a heat pump, ie, an evaporator 14, a condenser 16, a compressor 18 and their connecting pipes 23.
  • a thermopile array 21 is arranged so that the Heat radiation of the components of the heat pump as well as the drum 2 can be added.
  • the viewing area or detection area for paths 22 of the heat radiation of the components of the dryer to the infrared telescope 21 is indicated here by a dashed ellipse.
  • the infrared telescope 21 comprises a thermopile array 21 and an optical system which imposes it, which is not shown for the sake of clarity.
  • This optics can have a focal length of a few millimeters to a few centimeters, and the thermopile array 21 sits in its focal plane. In this way, an image of the environment of the infrared telescope 21 is generated on the thermopile array 21, so that different thermopiles measure temperatures therein at different locations in the tumble dryer 1.
  • the thermopile array 21 instead of the thermopile array 21, another areally extended infrared sensor technology can occur.
  • Fig. 2 shows a vertical section through a condensation dryer according to a second embodiment, which is here a heat pump dryer.
  • the condensation dryer 1 has a cylindrical laundry drum 2, which is rotatable about a substantially horizontally oriented (rotary) axis 3 and in which laundry items 4 are located, which are to be dried in the condensation dryer 1 in particular.
  • the drum 2 is made of stainless steel and has a cylindrical shell with a cylindrical outer drum surface see 5.
  • the cylindrical shell carries not shown here driver, which should support a lifting of the laundry items 4.
  • the corresponding opening of the front end wall 6 is closed by a door 7.
  • On the reverse side of the Laundry drum 2 joins the jacket to a circular rear end wall 8, which has perforations 9. Bearings and seals on or on which the drum 2 is mounted or with which it is sealed against its environment, are not shown here.
  • the perforations 9 are covered on the back of the laundry drum 2 by means of a hood 10.
  • a commonly available drive motor for the drum is not shown for clarity.
  • the process air 11 passes through the hood 10 and the perforations 9 in the drum 2, there to flow around the laundry items 4 and to extract moisture.
  • the heat pump evaporates in a closed refrigerant circuit 17 circulating and the evaporator 14 partially liquid supplied refrigerant, wherein it 1 1 heat escapes from the heat flowing through the moist, warm process air.
  • the vaporized refrigerant is then compressed by a compressor 18 and thereby heated, and then passes into the condenser 16.
  • the condenser 16 the refrigerant releases the heat absorbed in the evaporator 14 back to the process air flowing through.
  • the liquefied refrigerant passes through a throttle 19, which reduces its internal pressure and its temperature, back to the evaporator 14 to be re-evaporated and thereby absorb heat.
  • the refrigerant is usually a short-chain fluorinated hydrocarbon or a mixture of such compounds, in particular such as the substances R134a and R407C known in the art.
  • propane commonly referred to as R290, comes as a refrigerant into consideration.
  • the compressor 18 is a variable-power compressor whose power can be adjusted to the temperature of the components of the heat pump and thus of the refrigerant measured by the thermopile array 21 in order to keep the temperature of the refrigerant in an optimum range.
  • a control device 20 controls all the functions of the condensation dryer 1. For this purpose, it records the heat radiation values measured by the thermopiles of the thermopile array 21 for each component and activates corresponding actuators, in particular the drive motor of the drum 2, the process air blower for the process air 11 and the compressor 18.
  • the thermopile array 21 is arranged so that it can measure the indicated by dashed lines heat radiation of the outer drum shell 5, and of the compressor 18, throttle 19, evaporator 14 and condenser 16. A superior common look is not shown here.
  • Fig. 3 shows a vertical section through a condensation dryer according to a third embodiment, which is designed as a condensation dryer with an air-to-air heat exchanger.
  • the condensation dryer 1 shown in Figure 3 has a rotatable about a horizontal axis 3 drum 2 for receiving to be dried, not shown here, laundry items, on, are mounted within which driver 26 for moving laundry items during a drum rotation.
  • the process air 1 1 is performed in the process air duct 24 by means of a process air blower 27 through an air-air heat exchanger 30 and an electric heater 25 through the drum 2.
  • heated by the electric heater 25 process air 1 1 through the drum inlet 34 from the rear, ie from a door 7 opposite side of the drum 2, passed through the perforated bottom in the drum 2.
  • the process air 1 1 charged with moisture flows through the filling opening of the drum 2 through a lint filter 13 within the door 7 closing the filling opening. Subsequently, the flow of process air 11 in the door 7 is directed downward through the Drum outlet 33 is deflected into the process air duct 24 and directed to the air-to-air heat exchanger 30 can be transported by the cooling air in a cooling air passage 31 by means of a cooling air blower 32. In the air-air heat exchanger 30, a more or less large part of the moisture absorbed by the process air from the items of laundry condenses as a result of cooling and is collected in a condensate tray 15.
  • thermopile array 21 is arranged in the condensation dryer 1 shown here so that it can detect the heat radiation of measuring points 36 on the outer drum surface 5, the air-air heat exchanger 30, the process air blower 27 and the electric heater 25 and thus can measure. These measured values are supplied to the control unit 20 for evaluation and possible initiation of further steps. After evaluation of the measured heat radiation, the control unit 20 can then control, for example, the electric heating device 25, the drive motor 28, the process air blower 27 and / or the cooling air blower 32 in such a way that a drying program runs optimally and, for example, a predetermined laundry moisture is achieved.
  • a program control 20 which can be operated by the user via an operating unit 29.
  • a thermopile array 21 is arranged in the condensation dryer 1 shown here so that it can detect the heat radiation of measuring points 36 on the outer drum surface 5, the air-air heat exchanger 30, the process air blower 27 and the electric heater 25 and thus can measure. These measured values are supplied to the control unit 20 for evaluation and possible initiation of further steps. After evaluation of the measured heat
  • the process air blower 27 and the drum 2 are driven by the drive motor 28.
  • the drive motor 28 in this embodiment is a brushless DC motor (BLDC).
  • BLDC brushless DC motor
  • the drum 2 is heavily stocked, for example in the ratio 1: 55, whereas the process air blower 27 is not stocky, but is driven by the drive motor 28 with a speed ratio of 1: 1.
  • each component 25, 30 is assigned a thermopile of the thermopile array 21, so that the heat radiation of the respective component is measured by the assigned thermopile.
  • the thermopile array 21 for measuring thermal radiation of the outer drum surface 5 is arranged.
  • the controller 20 is configured to account for different emissivities of the components 25, 30.
  • maximum permissible values for the heat radiation of the components 25, 30 are stored in the control device 20 and the control device 20 is set up to switch off the condensation dryer 1 when a maximum permissible value for the thermal radiation of the components 25, 30 is exceeded and to display the exceeding of the maximum permissible value on a display device 35 of the condensation dryer 1.
  • thermopile array (comprising several thermopiles)
  • variable-speed drive motor e.g. BLDC motor

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un sèche-linge à condensation (1) comprenant un tambour (2) pour des articles (4) à sécher, un moteur d'entraînement (28) pour le tambour (2), un canal d'air de traitement (24), une soufflante d'air de traitement (27), un système de chauffage et de refroidissement (14, 16, 18, 19, 25, 30) pour l'air de traitement (11), un capteur de température (21) et un dispositif de commande (20). Le capteur de température (21) comprend un télescope infrarouge (21) et est destiné à mesurer simultanément le rayonnement thermique d'au moins deux composants (5, 14, 16, 18, 19, 24, 25, 27, 28, 30) à surveiller du sèche-linge à condensation (1). L'invention concerne par ailleurs un procédé permettant de faire fonctionner un sèche-linge à condensation (1) de ce type.
EP15754237.4A 2014-09-11 2015-08-27 Sèche-linge à condensation équipé d'un capteur de température et procédé pour faire fonctionner ce sèche-linge Not-in-force EP3191638B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014218254.9A DE102014218254A1 (de) 2014-09-11 2014-09-11 Kondensationstrockner mit einem Temperatursensor, sowie Verfahren zu seinem Betreiben
PCT/EP2015/069589 WO2016037856A1 (fr) 2014-09-11 2015-08-27 Sèche-linge à condensation comprenant un capteur de température, et procédé de fonctionnement correspondant

Publications (2)

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EP3191638A1 true EP3191638A1 (fr) 2017-07-19
EP3191638B1 EP3191638B1 (fr) 2018-10-17

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EP15754237.4A Not-in-force EP3191638B1 (fr) 2014-09-11 2015-08-27 Sèche-linge à condensation équipé d'un capteur de température et procédé pour faire fonctionner ce sèche-linge

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US (1) US10465332B2 (fr)
EP (1) EP3191638B1 (fr)
CN (1) CN107075780B (fr)
DE (1) DE102014218254A1 (fr)
WO (1) WO2016037856A1 (fr)

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Also Published As

Publication number Publication date
EP3191638B1 (fr) 2018-10-17
US10465332B2 (en) 2019-11-05
CN107075780B (zh) 2019-05-07
WO2016037856A1 (fr) 2016-03-17
CN107075780A (zh) 2017-08-18
US20170260683A1 (en) 2017-09-14
DE102014218254A1 (de) 2016-03-17

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