EP1593771A1 - Dispositif de chauffage pour le flux d'air chaud d'un sèche-linge - Google Patents

Dispositif de chauffage pour le flux d'air chaud d'un sèche-linge Download PDF

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Publication number
EP1593771A1
EP1593771A1 EP04011007A EP04011007A EP1593771A1 EP 1593771 A1 EP1593771 A1 EP 1593771A1 EP 04011007 A EP04011007 A EP 04011007A EP 04011007 A EP04011007 A EP 04011007A EP 1593771 A1 EP1593771 A1 EP 1593771A1
Authority
EP
European Patent Office
Prior art keywords
heating
hot air
heating assembly
temperature sensor
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04011007A
Other languages
German (de)
English (en)
Inventor
Andreas Lösch
Ralf Frohn
Jérôme Grunewald
Jens Köhne
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.)
DBK David and Baader GmbH
Original Assignee
DBK David and Baader 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 DBK David and Baader GmbH filed Critical DBK David and Baader GmbH
Priority to EP04011007A priority Critical patent/EP1593771A1/fr
Publication of EP1593771A1 publication Critical patent/EP1593771A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • 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 heating assembly for heating one in a flow channel a tumble dryer flowing hot air stream, wherein the heating assembly at least a temperature sensor by which the temperature of the hot air flow detectable is, as well as at least two in series, juxtaposed, from the hot air stream arranged around flow and at a connection end with a power supply includes connectable electrical heating elements.
  • Hot air flow is from an air supply through the usually between the drum and a rear wall of the tumble dryer flow channel extending into the drum into and through the wet laundry.
  • the hot air flow with at least one heating element heated.
  • at least one temperature sensor determines the temperature of the hot air flow.
  • a predetermined limit temperature is exceeded, the heating element switched off by the control unit of the clothes dryer.
  • Such a temperature control allows drying of the laundry with a textile suitable Temperature. In addition, this is to prevent this, that the rear wall of the tumble dryer heated excessively and thus the reliability of the Tumble dryer is at risk.
  • the present invention is based on the object To provide a heating assembly, in which the manufacturing and installation costs, while maintaining high reliability, lowered.
  • this object is achieved in that the at least one temperature sensor is arranged at a location which in the hot air flow closer to the terminal end the heating elements is as at the end remote from the terminal end.
  • the inventive solution reduces the installation effort, because only a cable bundle must be laid and connected. Furthermore, the connection cable must the temperature sensor designed only slightly longer than that of the heating elements be because the temperature sensors are located close to the terminal end. This reduces the material costs of the heating module. Surprisingly has also shown that the reliability of the invention Heating assembly increases because overheating of the heating elements, e.g. through a short circuit, is recorded very quickly.
  • the heating elements can be switched off very quickly before the ones to be dried Textiles exposed to high temperatures, leading to their damage or the outer wall of the tumble dryer overheats.
  • the heating assembly according to the invention can by different, independent, each be further developed for advantageous embodiments. To this Embodiments and the advantages associated with each of the embodiments is in The following is briefly mentioned.
  • the at least one temperature sensor with at least one heating element in the direction transverse to the flow direction at least partially overlapping, thereby overheating the shorted Detect heating elements even faster.
  • the at least one Temperature sensor arranged in the heating assembly opposite the heating element be.
  • the at least one temperature sensor can be arranged at one point be, at which the temperature incident on the heat radiation energy of at least a heating element is greater than that of the hot air flow by convection transferred heat energy.
  • the heating element during overheating especially be switched off quickly.
  • the at least one temperature sensor and the at least two heating elements to be mounted on a support element, wherein the Carrier element surrounding the heating elements at least partially thermally insulating.
  • the Carrier element surrounding the heating elements at least partially thermally insulating.
  • the hot air flow from a flow direction in an outflow direction deflecting and projecting into the hot air flow deflection at an angle be aligned to the flow direction, which is smaller than the angle between the Flow direction and the outflow direction is.
  • the outflow direction usually leads into the laundry drum, in which the laundry to be dried located.
  • the deflection can be formed on the support element.
  • the at least one temperature sensor as Thermostat be configured by the energy supply of the at least one heating element temperature dependent is controllable. As a result, the at least one heating element switched off by the thermostat when the permissible limit temperature is exceeded becomes. This saves additional control lines to the control unit of the tumble dryer which reduces the material costs of the heating assembly.
  • the heating assembly is thereby configured as a self-monitoring module unit, which only has to be supplied with energy during operation of the tumble dryer.
  • the proximity of the thermostats affects the terminal end of the heating elements because this causes short connecting cables between the thermostats and the Heating elements can be used. This reduces the material costs of the heating assembly.
  • heating element with a wire heater and in particular with an electric Be configured heating coil.
  • the reaction time of heating coils is significantly lower as e.g. of tubular heaters, by a larger mass comparatively sluggish in their heating or cooling are.
  • the heating coil in an advantageous Training be attached to a support member to the heating element stable embody. This has the advantage that a burned-through heating coil continues is held on the support element and does not fall on other heating coils and a cause electrical short circuit.
  • a method and apparatus for Production of such a heating element is described in DE 2 615 013 C3.
  • each case two heating elements with their heating coils be arranged parallel to each other to the hot air flow particularly effective to warm up. Furthermore, the heating elements with their heating coils in the direction transverse be arranged next to each other to the flow direction.
  • the heater assembly can at least one connector comprising, with which the heating assembly to a power source and / or a control unit is electrically connected.
  • the connector can be a standardized connector be, as a cost-effective purchased part, the manufacturing cost of the heating assembly reduced.
  • the heating assembly can be easily installed in the tumble dryer and the required assembly time is reduced, the heating assembly can be integrally into the Be used flow channel usable.
  • the invention relates in addition to the heating assembly described above and their embodiments also a tumble dryer for drying damp laundry with a hot air stream, wherein the tumble dryer with an air supply and one of the hot air flow Oberströmbaren flow channel is configured.
  • the tumble dryer comprises a heating assembly according to one of the above Embodiments.
  • the heating assembly with at least one fastening means be attached to the dryer, resulting in the necessary installation time the tumble dryer reduced.
  • FIGS. 1 and 2 the general structure of a heating module 1 according to the invention with Referring to FIGS. 1 and 2 and the exemplary embodiment illustrated therein.
  • the heating module 1 comprises a carrier element 2, to which two temperature sensors 3 and four heating elements 4 are mounted.
  • the heating module 1 flows through a hot air stream 5 in a flow direction D the support element 2 and flows around the heating elements 4. It is Heat energy emitted from the heating elements 4 to the hot air stream 5 and the Hot air stream 5 is heated.
  • the heating elements 4 convert electrical energy into heat energy.
  • electrical energy introduced via connecting lines 6 at a terminal end 7 in the heating elements 4.
  • the connection lines 6 are each electrically conductively connected to a heating element 4, such as. by welding or a plug connection.
  • Each heating element 4 comprises a heating coil 8 which heats up by its electrical resistance when electrical energy flows through them.
  • the embodiment shown in FIGS. 1 and 2 comprises four mutually parallel heating elements 4. At least two of the heating elements 4 are connected in series, i. their heating coils 8 are on the end remote from the terminal end electrically conductively connected to each other. This connection may be, for example, a cable.
  • the heating module 1 electric energy flows from the terminal end 7 through the heating coils 8 of the heating elements 4 through and at the connection end 7 again from the heating elements 4 addition. Due to their electrical resistance, the heating coils 8 heat and give Heat energy to the hot air stream 5 flowing around it.
  • the heating coils 8 are around support body. 9 wound.
  • a method and apparatus for making such heating elements is described for example in DE 26 15 013 C3.
  • the support body 9 the heating elements 4 are designed stably and need only at their ends with the support element 2 attached insulating 9 'be connected.
  • the support bodies 9 e.g. also a burned-through heating coil 8 held by it do not fall on the heating coil 8 of the other heating element 4 and a short circuit can cause.
  • the insulating elements 9 In the insulating elements 9 'slots (not shown) are configured, in which the Heating elements 4 are inserted.
  • the slots are arranged so that the flat Supporting body 9 of the heating elements 4 in the carrier element 2 parallel to the flow direction D of the hot air stream 5 are aligned. This will be a particularly low Flow resistance achieved by the heating elements 4 within the heating assembly 1.
  • two heating elements 4 are with their heating coils 8 parallel to each other and in Flow direction D mounted side by side in the support member 2.
  • the support member 2 surrounds the heating elements 4 as a rectangular frame by in the operation of the tumble dryer, the hot air flow 5 flows through and on the the inside of the insulating 9 'are mounted.
  • the insulating elements 9 'are made electrically and thermally insulating material, such as e.g. Micanite, made. Insulate it thermally the insulating elements 9 'the heating elements 4 and the hot air stream 5 after Outside. As a result, the heat energy generated by the heating elements 4 from the hot air flow 5 derived and little heat energy is emitted to the back wall of the tumble dryer delivered. By this configuration, the heat loss the heating module 1 minimized and the dryer particularly energy efficient operated.
  • the support member 2 through the insulating 9 'to the heating elements 4 electrically isolated.
  • the support member 2 is made of thin sheet metal, where the insulating 9 'are mounted.
  • a heat-insulating air layer To the heat insulation of the heating assembly 1 to reinforce the outside is between the support element 2 and the insulating elements 9 'at least partially configured a heat-insulating air layer.
  • Laterally two flange portions 10 are configured on the carrier element 2, in which holes 11 are arranged.
  • fastening means for this purpose screws, Rivets or locking means are used.
  • Temperature sensors 3 opposite the heating elements 4 are arranged in the support element 2 in the embodiment shown in FIGS. 1 and 2 in the embodiment shown in FIGS. 1 and 2 .
  • the temperature sensors 3 are mounted in a region of the hot air stream 5, the closer at the connection end 7 of the heating elements 4 is located at the end facing away from the connection end 7 The End.
  • the temperature sensors 3 are with the heating elements 4 arranged in the direction transverse to the flow direction D partially overlapping.
  • the temperature sensors 3 By the temperature sensors 3, the temperature of the hot air flow 5, the at them flowed by, measured. As a result, it is checked whether the hot air flow 5 a desired does not exceed maximum temperature. Exceeds the temperature of the Hot air flow 5 the allowable limit, the heating module 1 is switched off and thereby overheating the outer wall of the tumble dryer and the hot air stream 5 avoided.
  • Overheating of the heating elements 4 may be caused, for example, by a short circuit come, caused by externally into the heating assembly 1 reached metal parts becomes. Due to the short circuit, the effective length of the heating coils 8, through which flows through electrical energy during operation and heats it, and the electric Resistance of the heating elements 4 reduced.
  • the heating elements 4 only heat between the terminal end 7 and the short circuit, but there inadmissibly strong, because the introduced amount of energy remains unchanged.
  • the temperature sensors are 3 in a region of the hot air flow 5, which is closer to the terminal end 7 of the Heating elements 4 is located as at a terminal end 7 facing away from the end. Thereby the unacceptable heating of the heating elements 4 by an excessive temperature the hot air stream 5 detected particularly quickly.
  • the heating elements 4 can be timely shut off before the back of the clothes dryer or the laundry In the washing drum heat excessively.
  • the temperature sensors are 3 designed as a thermostat.
  • Thermostats are small switching units that are an electrical Can switch signal depending on the temperature.
  • the heating assembly 1 in Figs. 1 and 2 turn off the thermostats 3, the heating elements 4, as soon as the predetermined Limit temperature of the hot air stream 5 is exceeded.
  • the thermostats 3, for example, contain a bimetallic element which controls the flow of energy to the heating elements 4 temperature-dependent switched.
  • the heating assembly 1 is an independent module unit inside the tumble dryer, which only needs to be supplied with electrical energy.
  • the thermostats 3 are arranged in openings (not shown) in the carrier element 2.
  • the thermostats 3 are insoluble by a mechanically detachable or insoluble Compound, e.g. by welding points 12, connected to the carrier element 2.
  • the thermostats 3 by riveting, gluing, clinching or connected by a repeatedly releasable screw with the support member 2 be.
  • FIG. 3 another embodiment of the heating assembly according to the invention is shown. For the sake of simplicity, the following will briefly explain the differences from the embodiment Figs. 1 and 2 received.
  • the heating assembly 1 'shown in FIG. 3 comprises a carrier element 2' on which a Deflection surface 13 is formed, on the in operation of the heated hot air stream 5 in the Flow direction D meets.
  • the deflection surface 13 is aligned so that the hot air flow 5 in the direction of an outflow direction A is deflected.
  • the deflection surface 13 at an angle ⁇ to Direction of flow D aligned which is smaller than an angle between the flow direction D and the outflow A is.
  • the angle is half the angle.
  • I m operating the Heating module 1 ' is located in the outflow A advantageously the laundry drum of the clothes dryer, so that the hot air flow 5 through the deflection 13 is deflected in the direction of the laundry to be dried.
  • the heating assembly 1 'in Fig. 3 further comprises a connector 14, with which the Connecting lines 6 can be connected to a power source.
  • the preferred standardized connector 14 is the heating assembly 1 'during assembly of the clothes dryer very quickly connected to the energy source of the tumble dryer.
  • the inventive arrangement of the thermostats 3 in the vicinity of the terminal end 7 of the heating elements 4 are the connection lines 6 between the thermostats 3 and the heating elements 4 particularly short. This is the cost of the connecting cables 6 low.
  • FIG. 4 shows the heating assembly 1 of FIGS. 1 and 2 installed in a clothes dryer 15 is.
  • the tumble dryer 15 is removed with Rear cover 16 shown.
  • the tumble dryer 15 includes inside a laundry drum (not shown), in which is damp laundry during operation. From an air supply 17, the hot air flow 5 through openings 16 'in the laundry drum for drying the wet laundry introduced therein.
  • the mounted rear wall cover 16 forms the flow channel of the clothes dryer 15 off.
  • the heating assembly 1 is provided with fastening means 18 on Clothes dryer 15 attached. Due to the configuration of the fastening means 18 as Detent means, the heating assembly 1 during assembly of the clothes dryer 15 is particularly quickly attachable.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP04011007A 2004-05-07 2004-05-07 Dispositif de chauffage pour le flux d'air chaud d'un sèche-linge Withdrawn EP1593771A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04011007A EP1593771A1 (fr) 2004-05-07 2004-05-07 Dispositif de chauffage pour le flux d'air chaud d'un sèche-linge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04011007A EP1593771A1 (fr) 2004-05-07 2004-05-07 Dispositif de chauffage pour le flux d'air chaud d'un sèche-linge

Publications (1)

Publication Number Publication Date
EP1593771A1 true EP1593771A1 (fr) 2005-11-09

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EP04011007A Withdrawn EP1593771A1 (fr) 2004-05-07 2004-05-07 Dispositif de chauffage pour le flux d'air chaud d'un sèche-linge

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EP (1) EP1593771A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022885A1 (fr) * 2007-07-31 2009-02-11 DBK David + Baader GmbH Sèche-linge doté d'un volume de passage d'air avec une section isolée, et son unité de chauffage et son couvercle extérieur
CN106835647A (zh) * 2017-03-07 2017-06-13 厦门市佰社家居用品有限公司 一种新型衣物烘干器
EP3530797A1 (fr) * 2018-02-23 2019-08-28 LG Electronics Inc. Machine à laver et procédé de commande de machine à laver

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975832A (en) * 1973-12-26 1976-08-24 Matsushita Electric Industrial Co., Ltd. Hot air drying machine
JPS57122894A (en) * 1981-01-21 1982-07-30 Hitachi Ltd Clothing drier
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner
US4700495A (en) * 1986-09-22 1987-10-20 Whirlpool Corporation Heater assembly and mounting arrangement for a dryer
US5443541A (en) * 1993-03-18 1995-08-22 St. Louis; Robert M. Dual element electrical clother dryer with single element interrupt circuit
US6222133B1 (en) * 1999-05-05 2001-04-24 Camco Inc. One-piece ceramic terminal insulator mounting arrangement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975832A (en) * 1973-12-26 1976-08-24 Matsushita Electric Industrial Co., Ltd. Hot air drying machine
JPS57122894A (en) * 1981-01-21 1982-07-30 Hitachi Ltd Clothing drier
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner
US4700495A (en) * 1986-09-22 1987-10-20 Whirlpool Corporation Heater assembly and mounting arrangement for a dryer
US5443541A (en) * 1993-03-18 1995-08-22 St. Louis; Robert M. Dual element electrical clother dryer with single element interrupt circuit
US6222133B1 (en) * 1999-05-05 2001-04-24 Camco Inc. One-piece ceramic terminal insulator mounting arrangement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022885A1 (fr) * 2007-07-31 2009-02-11 DBK David + Baader GmbH Sèche-linge doté d'un volume de passage d'air avec une section isolée, et son unité de chauffage et son couvercle extérieur
CN106835647A (zh) * 2017-03-07 2017-06-13 厦门市佰社家居用品有限公司 一种新型衣物烘干器
EP3530797A1 (fr) * 2018-02-23 2019-08-28 LG Electronics Inc. Machine à laver et procédé de commande de machine à laver
EP3875667A1 (fr) * 2018-02-23 2021-09-08 LG Electronics, Inc. Machine à laver et procédé de commande de machine à laver
US11131049B2 (en) 2018-02-23 2021-09-28 Lg Electronics Inc. Washing machine and control method of washing machine

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