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
  • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
  • D06F58/04—Details 
• • 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
  • D06F2103/28—Air properties
  • D06F2103/32—Temperature
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
  • 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
  • D06F2105/32—Air flow control means
• • 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
  • D06F34/26—Condition of the drying air, e.g. air humidity or temperature

Definitions

• the invention relates to a vented air dryer with back-air detection, i. a detection of an opposite to the operationally provided flow direction flowing air flow (counter air flow), and a method for its operation.
• drying material in particular laundry, which is located in a generally rotating drum, is dried by passing through the drum and thus the dry material a heated air stream which removes moisture from the dry product, whereby the dry material is gradually dried ,
• Process air stream is heated in a supply line (supply air duct or herein “first process air duct”) in front of the drum (in the case of a tumble dryer also “laundry drum”) by means of a heater and after passage through the drum either to the outside ( Exhaust air dryer) or a heat exchanger in which the air flow is cooled and the moisture removed from the dry matter and precipitated in the air flow precipitates as condensate, mixed forms of which are also known.
• a blower process air blower
• the moist, warm air originating from the drum is transported through an exhaust air outlet into the installation room or via an exhaust system to the outside.
• an exhaust air dryer In an exhaust air dryer, the moist, warm air originating from the drum is transported through an exhaust air outlet into the installation room or via an exhaust system to the outside.
• air is forced through the exhaust air outlet in the exhaust air dryer. This can lead to a disruption of the overheating system which is normally present in the exhaust air dryer.
• a temperature sensor or temperature limiter is arranged in an exhaust air dryer usually in the flow direction of the process air behind the heater and in front of the drum, which can turn off the heater at a detected overheating in the exhaust air dryer.
• air heated by the heating device can flow in opposite direction, ie away from the drum, flow.
• This hot air can flow into a supply air duct or, if present, into a recirculating air duct.
• a hot air flow in the opposite direction of flow can lead to disturbances and is therefore undesirable.
• the object of the invention is therefore to provide an exhaust air dryer, which allows reliable detection of the occurrence of a counter air flow during operation of the exhaust air dryer.
• the invention thus relates to an exhaust air dryer with a drum for drying dry material by means of warm process air, a heating device for heating the process air in a first process air duct in front of the drum into which a supply air duct opens, a second process air duct after the drum, which merges into an exhaust duct, a fan and a first temperature sensor in the first process air duct, wherein the exhaust air dryer has a device for generating a heat accumulation at the first temperature sensor when a counter air flow occurs.
• temperature sensor is to be construed broadly, including, for example, any temperature sensor that merely measures a temperature value and passes that temperature value to a suitable processing device, such as program control of the temperature sensor Vented dryer. Temperature sensor according to the invention is also such a sensor device, which can initiate a measure as a result of measuring a temperature value without the detour via a process control, for example, the interruption of a circuit. Such a sensor device is generally referred to as a "temperature monitor.”
• a temperature monitor may, for example, consist of a bimetallic plate which deforms appropriately in the event of a temperature change and in particular can interrupt a circuit when a certain upper temperature limit is reached by operating a correspondingly assigned switch.
• the device for generating a heat accumulation between the heater and the drum is arranged.
• the device is disposed between the first temperature sensor and the drum.
• the first temperature sensor is generally used to detect a heat build-up. In a preferred embodiment, therefore, a distance between the device and the first temperature sensor of 1 to 15 cm, in particular 2 to 10 cm.
• the device is preferably a folding device.
• this folding device changes its position depending on the direction of an air flow in the first process air duct.
• folding device means that it is a device that can assume different positions in the first process air channel, which manifest themselves in a more or less great impediment to an air flow in the first process air channel.
• the shape and arrangement of the folding device are not limited as long as the purpose of the present invention is achieved.
• the folding device is a substantially planar, pivotable plate.
• the folding device may have at its one end, on which it is arranged, for example, on a wall of the first process air circuit or on the first temperature sensor, a shape suitable for the arrangement.
• the arrangement of the folding device in the exhaust air dryer is generally carried out via a suitable connection, which allows any necessary pivoting of the folding device, such as a hinge mechanism.
• the folding device is arranged by means of a hinge or spring mechanism on a wall of the first process air duct or on the first temperature sensor. More preferably, the folding device is arranged by means of a hinge mechanism on the wall of the first process air duct or on the first temperature sensor.
• a planar plate may be suitably bent at one end to form a hinge with a holder, in particular an arrangement of one lug or lobes, on a wall of the first process air channel or on the first sensor.
• the device here the flat plate, is thus rotatably mounted on the wall or the sensor.
• the shape of the device may differ from a flat plate.
• embodiments may provide for the use of two or more thermal heat generation devices upon the occurrence of a countercurrent flow.
• the change in the position of the device in the first process air duct as a result of a varying air flow which can also be referred to as deflection of the device is preferably chosen so that the device, in particular the folding device, in a reversal of the flow direction of the air in the first process air duct again their previous position can take.
• an angle which the device, in particular the folding device, can form with the direction of flow of the air is suitably limited.
• the possibility of generating a heat build-up by the device when a counterflow of air occurs is important. It is not necessary for this purpose that an air flow in the first process air duct is completely interrupted.
• the device, in particular the folding device in an open, in particular in an unfolded state, does not completely close the first process air channel.
• a second temperature sensor is present in the exhaust air dryer according to the invention.
• a second temperature sensor which may possibly also be combined with another device for generating a heat accumulation, the reliability of the exhaust air dryer increases.
• a second temperature sensor is connected to a program control of the exhaust air dryer.
• the exhaust air dryer according to the invention can be operated as a pure exhaust air dryer, in which the entire amount of passing out of the drum moist, warm process air is passed as exhaust air into the installation room.
• the exhaust air dryer according to the invention is operated with a recirculated air fraction.
• a first end of a circulating air channel opens into the first process air channel and a second end of the circulating air channel into the second process air channel.
• the content of lint in the process air coming out of the drum can be reduced by one or more suitable lint filters.
• this also includes a heat exchanger (condenser) in which the warm moist air exiting the drum, which is also enriched with lint, by heat exchange with a suitable cooling medium (supply air or cooling air in a optionally existing air-to-air heat exchanger, refrigerant in the evaporator of an optional heat pump) is cooled and condenses moisture contained in the process air.
• a suitable cooling medium supply air or cooling air in a optionally existing air-to-air heat exchanger, refrigerant in the evaporator of an optional heat pump
• the moist condenser can act as a kind of lint filter.Network meshes with different mesh sizes can also be used as lint filter be used.
• the exhaust air dryer in the embodiment with a recirculating air duct has a lint trap in the recirculating air duct.
• the exhaust air dryer according to the invention can be operated with or without a heat exchanger for condensing the moisture contained in the warm process air after passing through the drum.
• an occurrence of a counterflow of air in the form of an optical and / or acoustic signal is indicated.
• an acoustic signal display could be used as the display means, e.g. one or more encoders with different sounds or tones, or a speech synthesizer with a message such as e.g. "Counter air” or "overheating”.
• a corresponding information can also be done via an optical signal display (LED or LCD).
• the exhaust air dryer on display means for occurrence of a counter air flow.
• the invention also relates to a method for operating an exhaust air dryer, comprising a drum for drying wet laundry by means of warm process air, a heating device for heating the process air in a first process air duct in front of the drum into which a supply air duct opens, a second process air duct downstream of the drum passing into an exhaust duct, a blower, a first temperature sensor in the first process air duct and a device for generating a heat accumulation upon the occurrence of a counter air flow, wherein upon occurrence of a counter air flow from the drum toward the heater, the apparatus obstructs and obstructs an air flow in the first process air duct Heat accumulation generated at the first temperature sensor.
• the first temperature sensor it is preferable for the first temperature sensor to switch off the heating device upon reaching a predefined maximum temperature value T max and / or to indicate the occurrence of a counterflow of air with a display means.
• the predetermined temperature value T max becomes suitable in Depending on factors such as the distance of the first temperature sensor from the device, the location of the arrangement of the second temperature sensor and / or the design of the airways (first and second process air duct, circulating air duct, etc.) set.
• the first and, if present, a second temperature sensor are connected to a program control of the exhaust air dryer.
• the exhaust air dryer according to the invention has the advantage that an occurrence of a counter air flow can be reliably detected, whereupon suitable or by a user of the exhaust dryer suitable countermeasures, in particular a shutdown of the heating of the exhaust air dryer can be initiated. Due to the invention, the use of a second temperature sensor is unnecessary.
• FIG. 1 shows a partial sectional view of an exhaust air dryer.
• Figure 2 shows a section of the exhaust air dryer of Fig. 1, in which the relevant part of a first process air duct is visible.
• FIG. 3 shows a view of an enlarged part of the detail of FIG. 2 along the solid arrow drawn in FIG.
• a vented dryer 1 is shown in partial sectional view. This has in its upper part on a program control 17, which is adjustable by an operating handle 19 and preferably may contain a fuzzy processor controller, not shown here. 18 means an optical or acoustic display means for different states of the exhaust air dryer 1, in particular the occurrence of a counter air flow.
• the exhaust air dryer 1 has a drum 2, which is accessible via a pot 20 from a loading door 21 and can be introduced into the drum 2 via the laundry items to be dried and removed again.
• a supply air opening 22 is present, into which air is sucked from outside via a blower 11 and conducted via a supply air duct 5 into a first process air duct 4.
• the fresh process air also referred to as "supply air”
• the first process air duct 4 is interposed in the embodiment shown in FIG the heater 3 and the drum 2, a first temperature sensor 13, a designed as a folding device 12 for generating a heat accumulation and a second temperature sensor 25.
• the second temperature sensor 25 detects at predetermined time intervals periodically the temperature of the process air and supplies the measured value of the program control 17.
• Fig. 1 the arrows show the direction of flow of air in an operationally provided, ie normal operation of the exhaust dryer 1.
• the warm air coming from the heater 3 (called “process air” in the first and second process air ducts)
• the folding device 12 away from the first temperature sensor 13 in the direction of a wall 28 of the first process air channel 4.
• the folding device 12 is connected via a hinge mechanism 14 with the wall 28.
• the heated process air can thus flow freely and first passes through the drum 2.
• warm process air laden with moisture at the drum outlet 24 through a second process air duct 8, in which there is initially a second lint filter 26.
• the process air continues to flow through the second process air duct 8, which in the embodiment shown in FIG an exhaust duct 9 splits Embodiments in which in particular a recirculating air channel has been omitted are conceivable.
• Part of the process air from the drum 2 thus passes as shown in FIG. 1 via the exhaust duct 9 to an exhaust outlet 27, from where the process air flows as exhaust air into the installation room of the exhaust dryer or in an exhaust air system not shown here.
• the remaining part of the process air flows in this embodiment through the circulating air channel 7, in a fluff trap 29 is arranged, via the blower 11 and the heater 3 back into the drum 2.
• the exhaust air dryer 1 of this embodiment thus operates according to the exhaust air principle with a recirculated air portion.
• the relative proportions of supply and circulating air via a first valve 15 (designed here as a flap) in the supply air duct 5 and a second valve 16 (also configured here as a flap) in the recirculating air channel 7 can be adjusted ,
• Figure 2 shows a section of the exhaust air dryer of Fig. 1, in which the relevant part of a first process air duct 4 is visible. Shown is a heater 3 above which is in the normal, i. operatively provided flow direction of the air, indicated here by two open arrows, a first temperature sensor 13, a device 12 for generating a heat accumulation and a second temperature sensor 25 are located. 28 denotes a wall of the first process air channel 4.
• the device 12 is shown for generating a heat accumulation in a deployed state, ie. In a state after the occurrence of a counter air flow through which it comes to the first temperature sensor 13 due to the obstruction of the air flow of the air from the heater 3 to a heat accumulation , The device 12 is attached to a wall 28 of the first process air channel 4.
• the small open arrow shows the obstructed air flow from the heater 3.
• the two large open arrows indicate a counter air flow, which has led to the unfolding of the device 12.
• the first temperature sensor 13 may register a value of the air temperature increased due to the heat build-up. 25 means a second temperature sensor, which contributes to increased reliability of the exhaust air dryer.
• FIG. 3 shows a plan view of an enlarged part of the detail of FIG. 2.
• the plan view is taken along the solid arrow drawn in FIG.
• the two possible directions of the air flow are illustrated by a double arrow.
• the device 12 is bent to produce a heat accumulation in the presence of a counter air flow at one end to form a hinge mechanism 14 at a location of the wall 28 of the first process air duct not shown in detail, in which the device 12th is rotatably mounted.
• 13 means a first temperature sensor 13, which registers a heat accumulation generated due to the unfolded device 12.

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)

Applications Claiming Priority (2)

Publications (2)

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ID=40790883

Family Applications (1)

Country Status (6)

Families Citing this family (12)

Family Cites Families (20)

• 2008
  • 2008-04-29 DE DE102008021376A patent/DE102008021376A1/de not_active Withdrawn
• 2009
  • 2009-04-08 AT AT09737986T patent/ATE539190T1/de active
  • 2009-04-08 WO PCT/EP2009/054246 patent/WO2009132942A1/fr active Application Filing
  • 2009-04-08 CN CN2009801153675A patent/CN102016157B/zh not_active Expired - Fee Related
  • 2009-04-08 US US12/988,342 patent/US8528226B2/en not_active Expired - Fee Related
  • 2009-04-08 EP EP09737986A patent/EP2271801B1/fr not_active Not-in-force

Non-Patent Citations (1)

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