EP2986769B1 - Panel heating device for heating water in a washing tub, washing machine and method for producing a panel heating device - Google Patents
Panel heating device for heating water in a washing tub, washing machine and method for producing a panel heating device Download PDFInfo
- Publication number
- EP2986769B1 EP2986769B1 EP14716819.9A EP14716819A EP2986769B1 EP 2986769 B1 EP2986769 B1 EP 2986769B1 EP 14716819 A EP14716819 A EP 14716819A EP 2986769 B1 EP2986769 B1 EP 2986769B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carrier plate
- heating device
- intermediate layer
- tub
- washing tub
- 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.)
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Links
- 238000010438 heat treatment Methods 0.000 title claims description 90
- 238000005406 washing Methods 0.000 title claims description 35
- 239000008236 heating water Substances 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000004020 conductor Substances 0.000 claims description 48
- 239000000463 material Substances 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000007750 plasma spraying Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 238000007751 thermal spraying Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 3
- 239000004411 aluminium Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 58
- 238000009413 insulation Methods 0.000 description 5
- 238000013021 overheating Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
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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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/04—Heating 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
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/10—Temperature of washing liquids; Heating means therefor
-
- 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
- D06F34/22—Condition of the washing liquid, e.g. turbidity
- D06F34/24—Liquid temperature
Definitions
- the invention relates to a surface heating device for heating water or alkali in a tub in a washing machine, with a flat support plate for attachment to the tub, and with a conductor formed as a conductor heating conductor, which is acted upon by electrical energy and is designed to generate heat, wherein the heat is released through the carrier plate to the water.
- the invention also relates to a washing machine with a tub and such a surface heater and a method for producing a surface heater.
- Heating devices for heating the wash liquor in the tub of a washing machine are already state of the art.
- tubular heaters or rod-shaped heating elements are usually used.
- these have the disadvantage that they are surrounded on all sides by wash liquor and thus must be mounted in a radiator pocket. This creates an additional consumption of water and electrical energy, the so-called "dead fleet”.
- such tubular heaters are also particularly susceptible to the addition of lime and lint, which in turn can lead to local overheating and thus in the worst case to failure of the device.
- the surface heating device has an intermediate layer of a good thermal conductivity material such as aluminum, which is connected to the carrier plate and the heating conductor and distributes the heat.
- heating foils and other flexible heating media are known, which, however, can not be used because of problems in terms of insulation, electrical contact and fixation in the washer.
- Aêtnwar seen invention is designed for heating water in a tub of a washing machine and includes a flat support plate which can be attached to the tub, in particular such that the support plate conceals a recess formed in a wall of the tub.
- the surface heating device also has a heating conductor designed as a conductor for generating heat for heating the liquor, wherein the heat is released through the carrier plate to the water.
- the surface heating device is designed as a sandwich component in which an intermediate layer is arranged between the heating conductor and the carrier plate for uniform distribution of the heat relative to the surface, this intermediate layer being formed from a material which has greater thermal conductivity relative to the carrier plate.
- the surface heating device consists of a uniform layer composite of the carrier plate, the intermediate layer, the heating conductor and preferably a further insulating layer, wherein the heating conductor may be formed in a meandering shape.
- the heat provided by the heating conductor is thus homogeneously distributed over the surface by means of the thermally highly conductive intermediate layer and discharged from the intermediate layer through the support plate to the water.
- Such surface heating device has various advantages: First, thus local overheating can be prevented by addition of lime and lint in the tub, because the intermediate layer provides for a homogeneous heat distribution over the surface of the intermediate layer. This results in a reliable and reliable heating of the liquor in the tub. Compared to a conventional tubular heater heating also a water and energy saving is achieved, for example in the range 6 to 8%. Due to the planar or flat geometry of the surface heater also the addition of lint is avoided in the tub.
- Another advantage is that due to the poorer thermal conductivity of the support plate these can be easily mounted on the tub, without the heat is transferred to the tub itself. Due to a small thickness of the carrier plate, the heat transfer through the carrier plate to the liquor in the tub is mainly in the direction perpendicular to the carrier plate, while heat transfer in the lateral direction (in the plane of the carrier plate) is minimal due to the poor thermal conductivity of the carrier plate.
- This has advantages in terms of attachment of the surface heater to the tub. Namely, the support plate can be connected to the tub, for example, by friction welding, while the other components of the surface heater, which are remote from the interior of the tub, do not come into contact with the material of the tub.
- the intermediate layer has a relative to the carrier plate greater thermal capacity.
- the intermediate layer can thus store significantly more thermal energy than the carrier plate, which in particular heat accumulation can be avoided and heat losses can be reduced.
- the intermediate layer is formed from a material whose thermal conductivity of the thermal conductivity of the support plate by a factor greater than 5, in particular a factor greater than 10, is higher.
- the intermediate layer is formed of a material whose thermal conductivity of the Thermal conductivity of the support plate is greater by a factor which is in a range of from 5 to 20, in particular from 10 to 20.
- the support plate is formed of stainless steel.
- This embodiment has advantages in terms of the life of the surface heater. It is namely the support plate, which faces the interior of the tub and thus exposed to the liquor. The design of the support plate made of stainless steel thus corrosion of the surface heater is prevented.
- Stainless steel also has a thermal conductivity which is relatively low and therefore particularly suitable for the present application. Thus, the heat can be reliably and effectively delivered through the material of the support plate to the liquor, while in the direction parallel to the support plate takes place only a minimal or, if possible, substantially no heat transfer.
- the thermal conductivity of the carrier plate is preferably less than 20 W / mK.
- the intermediate layer is formed of a material whose thermal conductivity is greater than 150 W / mK, in particular greater than 200 W / mK. This ensures a homogeneous heat distribution over the entire surface of the intermediate layer and thus for an effective and reliable as well as with respect to the surface uniform heat transfer to the liquor in the tub.
- the intermediate layer is formed from aluminum.
- This embodiment has manufacturing advantages, because the aluminum layer can be applied to the carrier plate without much effort, for example by soldering, rolling or welding, in particular friction welding.
- the heating conductor is preferably applied by thermal spraying, in particular by plasma spraying.
- This means that the heating conductor is applied in a plasma process, which in particular has the advantage that materials can be used for the heating conductor, which have a relatively high melting point. Such materials can be used particularly advantageously as heating conductors.
- the surface heater can be inexpensively manufactured by the known plasma deposition process.
- the surface heating device may also be arched or bent.
- an adaptation of the geometric shape to the circular Shape of the tub allows.
- the support plate is inserted within a recess in the tub and thus a portion of the wall of the tub is formed by the support plate, thus flattening in the tub can be prevented.
- a reliable and well-adhering connection between the tub and the surface heater can be made possible.
- the invention is not limited to a curved configuration of the surface heating device. It is also possible to design the surface heating device flat or planar, which in turn offers advantages with regard to the production of the surface heating device.
- the carrier plate has a side region that protrudes beyond the intermediate layer or protrudes laterally, in particular completely around the intermediate layer, over which the carrier plate and thus the entire surface heating device is attached to the tub.
- the carrier plate as a whole is larger than the intermediate layer, so that said edge region is formed free of the intermediate layer.
- Such an embodiment of the carrier plate has the advantage that over the edge region, the surface heater can be effectively mounted or fixed to the tub, while the intermediate layer is arranged in register with a continuous recess of the tub and thus does not come into contact with the tub.
- an additional layer is preferably provided, which is formed from an electrically insulating material.
- this insulating layer in particular generated by plasma spraying insulating layer, the heating element is then applied directly.
- the heating conductor can be electrically isolated from the intermediate layer.
- This insulating layer may be formed, for example, of aluminum oxide.
- the support plate - preferably made of stainless steel - has, for example, a thickness which is in a value range of 0.3 to 1.2 mm, in particular in a value range of 0.7 to 0.9 mm.
- the intermediate layer-in particular of aluminum-can have a thickness which lies in a value range from 0.2 to 1 mm, in particular from 0.4 to 0.6 mm.
- the said insulation layer may for example have a thickness which is in a value range of 0.1 to 0.25 mm, in particular of 0.2 mm.
- the thickness of the conductor track of the heating conductor is preferably in the value range of 10 to 30 .mu.m, in particular of 20 microns.
- the heating conductor is preferably provided in the form of a meander-shaped conductor track, which may also have a plurality of meander loops. This results in a planar heat generation by the heating conductor.
- the entire heating conductor is arranged in overlap or overlap with the intermediate layer and the carrier plate, so that the overall result is a sandwich component.
- the invention also relates to a washing machine with a tub and a surface heating device according to the invention.
- the tub has a continuous recess which is covered by the support plate, so that the support plate forms an area of a wall of the tub and thereby faces the interior of the tub, while the heating element is remote from the interior.
- the intermediate layer and the heating element are arranged in coincidence with the continuous recess of the tub.
- the support plate is preferably connected by welding, in particular friction welding, with the tub.
- a friction welding for example, the ultrasonic welding can be provided.
- the carrier plate can be indirectly connected to the tub.
- the support plate is sealingly connected to a fastener or an adapter, wherein the adapter is connected for example by means of friction welding to the tub, wherein the above-mentioned connection method of the support plate can also be used for this connection of the adapter.
- the adapter is made of plastic.
- connection of the support plate or the adapter with the tub other connection techniques, such as an adhesive connection, snap connection and / or screw connection.
- connection techniques such as an adhesive connection, snap connection and / or screw connection.
- connection of the carrier plate or the adapter with the tub by means of injection molding or encapsulation, which can be done in particular at the same time during injection molding of the tub.
- a circumferential seal is preferably used.
- a method according to the invention for producing a surface heating device for heating liquor in a tub of a washing machine by providing a flat support plate, which is attached to the tub, and providing a heating conductor in the form of a conductor for generating heat, wherein the heat through the support plate is passed through to the liquor, and wherein for the even distribution of heat, an intermediate layer between the heating conductor and the carrier plate is arranged and formed of a material having a greater thermal conductivity and greater thermal capacity relative to the carrier plate.
- the heating conductor can be applied by plasma spraying.
- the carrier plate can be connected by friction welding with the tub.
- Fig. 1 is shown in a schematic and highly abstract representation of a washing machine 1 according to an embodiment of the invention.
- the washing machine 1 comprises in a known manner a laundry drum 2, which is designed to receive laundry items and, for example, is rotatably mounted about a horizontally extending axis of rotation 3.
- the laundry drum 2 is located in a tub 4, which also has a cylindrical shell or circumference.
- a bottom 5 of the washing machine 1 facing region of the tub 4 is formed in a wall of the tub 4 a not shown in the figures continuous recess or passage opening in the area of a surface heater 6 is arranged, which covers said recess and closes.
- the recess may be, for example, a rectangular passage opening.
- the surface heating device 6 is arched or bent and thus adapted to the geometric shape of the tub 4.
- the surface heater 6 is shown in detail in FIG Fig. 2 shown.
- the surface heating device 6 comprises a carrier plate 7 formed, for example, from stainless steel, whose thickness is, for example, between 0.7 and 0.9 mm, typically 0.8 mm.
- the support plate 7 is an intrinsically stiff component, which is connected to the tub 4 (made of plastic) by friction welding. In this case, a peripheral edge region 8 of the support plate 7 is brought into contact with an edge region of the recess of the tub 4 and connected thereto by friction welding.
- the compound can also indirectly via an adapter, not shown, sealingly with the carrier plate. 7 is connected, carried out, in which case, for example, the adapter is connected by friction welding with the tub 4. It is also possible to use other types of connection for fastening the carrier plate 7 or its adapter, for example a screw connection, latching connection, adhesive connection and the like. In addition, a seal can be used between the support plate 7 and the tub 4.
- an intermediate layer 10 is applied directly, which is for example made of aluminum.
- This intermediate layer 10 thus has a very high thermal conductivity compared to the carrier plate 7, in particular greater than 200 W / mK.
- This intermediate layer 10 is slightly smaller than the carrier plate 7, so that the edge region 8 is free of the intermediate layer 10.
- the intermediate layer 10 is arranged in the assembled state in overlap with the continuous recess of the tub 4, wherein the intermediate layer 10 facing away from the interior of the tub 4 and the bottom 5 faces. An overlap between the intermediate layer 10 and the wall of the tub 4 is preferably not given.
- the intermediate layer 10 can be applied to the carrier plate 7, for example, by soldering or rolling.
- the intermediate layer 10 may, for example, have a thickness of 0.4 to 0.6 mm, typically 0.5 mm.
- an insulating layer 11 is applied to the intermediate layer 10, for example of aluminum oxide.
- This insulating layer 11 is used for electrical insulation between the intermediate layer 10 on the one hand and a heating conductor 12 on the other hand, which is applied directly to the insulating layer 11 in the form of a conductor 13.
- the production of the heating conductor 12 can be carried out, for example, in a plasma process, so that the heating conductor is applied to the insulation layer 11 by plasma spraying.
- the heating conductor 12 is formed in the form of a meander-shaped conductor track 13 with a plurality of meander loops 14.
- the heating conductor is further connected to a plug 15, via which the heating conductor 12 can be subjected to electrical voltage.
- security elements 16 can be integrated, which after exceeding a predetermined current or a predetermined shutdown the open electrical circuit. These security elements 16 may be designed, for example, as a fuse.
- the surface heating device 6 may also have one or more temperature sensors 17.
- a temperature sensor 17 may, for example, be arranged on the carrier plate 7, in particular thermally decoupled from the heating conductor, and be in contact therewith. By means of this temperature sensor 17, the temperature of the liquor in the tub 4 is then measured, and depending on this measured temperature, the current through the heating element 12 and thus the temperature can be controlled. Additionally or alternatively, a temperature sensor in the region of the insulating layer 11 may be arranged. The temperature sensors 17 can be electrically contacted via the plug 15.
- the surface heating device 6 is thus provided overall in the form of a sandwich component, which has a plurality of layers, namely the support plate 7, the intermediate layer 10, the insulation layer 11 and the heating conductor 12.
- the support plate 7 is preferably a consistently homogeneous plate without through holes below the Intermediate layer 10. This means that only the carrier plate 7 comes into contact with the liquor and the other layers are remote from the liquor. Because the support plate 7 is preferably formed of stainless steel, there is no corrosion during operation of the washing machine 1.
- the heating element 12 and the other layers are outside of the tub 4.
- the heating conductor 12 is traversed by electric current and thus generates heat.
- This heat is absorbed and stored by the intermediate layer 10 made of aluminum and discharged through the material of the support plate 7 to the liquor in the tub 4.
- the thermal conductivity of the carrier plate 7 is so low, in particular less than 20 w / mK, that the heat transfer via the support plate 7 basically only in the direction perpendicular to the support plate 7 due to the very small thickness, while substantially no heat transfer in the direction parallel to the support plate 7 and thus takes place to the edge region 8. Thus, no heat is transferred to the material of the tub 4 itself.
- the support plate 7 is mounted in the corresponding recess in the lower region of the wall of the tub 4, wherein the support plate 7 faces the interior of the tub 4 and is thus connected via its rear side 18 with the tub 4.
- ⁇ layer or SMD components can be integrated into the surface heating device 6, such as a thermostat or other sensors.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Surface Heating Bodies (AREA)
Description
Die Erfindung betrifft eine Flächenheizeinrichtung zum Aufheizen von Wasser bzw. Lauge in einem Laugenbehälter in einer Waschmaschine, mit einer flachen Trägerplatte zum Anbringen an dem Laugenbehälter, und mit einem als Leiterbahn ausgebildeten Heizleiter, welcher mit elektrischer Energie beaufschlagbar und zum Erzeugen von Wärme ausgebildet ist, wobei die Wärme durch die Trägerplatte hindurch an das Wasser abgegeben wird. Die Erfindung betrifft außerdem eine Waschmaschine mit einem Laugenbehälter und einer solchen Flächenheizeinrichtung sowie ein Verfahren zum Herstellen einer Flächenheizeinrichtung.The invention relates to a surface heating device for heating water or alkali in a tub in a washing machine, with a flat support plate for attachment to the tub, and with a conductor formed as a conductor heating conductor, which is acted upon by electrical energy and is designed to generate heat, wherein the heat is released through the carrier plate to the water. The invention also relates to a washing machine with a tub and such a surface heater and a method for producing a surface heater.
Heizeinrichtungen für die Aufheizung der Waschlauge in dem Laugenbehälter einer Waschmaschine sind bereits Stand der Technik. Hierbei werden in der Regel Rohrheizkörper bzw. stabförmige Heizelemente eingesetzt. Diese weisen jedoch den Nachteil auf, dass sie allseitig von Waschlauge umgeben und somit in einer Heizkörpertasche montiert werden müssen. Dadurch entsteht ein zusätzlicher Verbrauch von Wasser und elektrischer Energie, die sogenannte "tote Flotte". Darüber hinaus sind solche Rohrheizkörper auch besonders anfällig gegen die Anlagerung von Kalk und Flusen, was wiederum zu lokalen Überhitzungen und somit im ungünstigsten Fall zu einem Ausfall des Geräts führen kann.Heating devices for heating the wash liquor in the tub of a washing machine are already state of the art. In this case tubular heaters or rod-shaped heating elements are usually used. However, these have the disadvantage that they are surrounded on all sides by wash liquor and thus must be mounted in a radiator pocket. This creates an additional consumption of water and electrical energy, the so-called "dead fleet". In addition, such tubular heaters are also particularly susceptible to the addition of lime and lint, which in turn can lead to local overheating and thus in the worst case to failure of the device.
Aus diesen Gründen wurden bereits Flächenheizeinrichtungen entwickelt. Auch diese haben jedoch Nachteile hinsichtlich der Empfindlichkeit gegen lokale Überhitzungen, Kosten sowie der planaren Montage. Als nachteilig an solchen Flächenheizeinrichtung erweist sich insbesondere der Umstand, dass die eingesetzten Heizleiter in Form von Leiterbahnen zu lokalen Überhitzungen bei Anlagerung von Kalk und Flusen im Laugenbehälter führen können.For these reasons, surface heating devices have already been developed. However, these also have disadvantages in terms of sensitivity to local overheating, costs and the planar assembly. A disadvantage of such Flächenheizeinrichtung proves in particular the fact that the heating element used in the form of traces can lead to local overheating with addition of lime and lint in the tub.
Ferner ist aus
Die Flächenheizeinrichtung weist eine Zwischenschicht aus einem gut wärmeleitfähigen Material wie Aluminium auf, das mit der Trägerplatte und dem Heizleiter verbunden ist und die Wärme verteilt.The surface heating device has an intermediate layer of a good thermal conductivity material such as aluminum, which is connected to the carrier plate and the heating conductor and distributes the heat.
Außerdem sind Heizfolien und andere flexible Heizmedien bekannt, welche jedoch wegen Problemen hinsichtlich der Isolation, der elektrischen Kontaktierung sowie der Fixierung in dem Waschgerät nicht eingesetzt werden können.In addition, heating foils and other flexible heating media are known, which, however, can not be used because of problems in terms of insulation, electrical contact and fixation in the washer.
Es ist Aufgabe der Erfindung, eine Lösung aufzuzeigen, wie bei einer Flächenheizeinrichtung der eingangs genannten Gattung ohne viel Aufwand eine besonders zuverlässige und betriebssichere Beheizung von Lauge in dem Laugenbehälter ermöglicht werden kann.It is an object of the invention to provide a solution, as in a surface heater of the type mentioned without much effort a particularly reliable and reliable heating of liquor can be made possible in the tub.
Diese Aufgabe wird erfindungsgemäß durch eine Flächenheizeinrichtung, durch eine Waschmaschine sowie durch ein Verfahren mit den Merkmalen gemäß den jeweiligen unabhängigen Patentansprüchen gelöst. Vorteilhafte Ausführungen der Erfindung sind Gegenstand der abhängigen Patentansprüche, der Beschreibung und der Figuren.This object is achieved by a Flächenheizeinrichtung, by a washing machine and by a method with the features according to the respective independent claims. Advantageous embodiments of the invention are the subject of the dependent claims, the description and the figures.
Eine erfindungsgemäße Flächenheizeinrichtung ist zum Aufheizen von Wasser in einem Laugenbehälter einer Waschmaschine ausgebildet und umfasst eine flache Trägerplatte, welche an dem Laugenbehälter angebracht werden kann, insbesondere derart, dass die Trägerplatte eine in einer Wandung des Laugenbehälters ausgebildete Aussparung verdeckt. Die Flächenheizeinrichtung weist auch einen als Leiterbahn ausgebildeten Heizleiter zum Erzeugen von Wärme zum Aufheizen der Lauge auf, wobei die Wärme durch die Trägerplatte hindurch an das Wasser abgegeben wird. Erfindungsgemäß ist die Flächenheizeinrichtung als Sandwich-Bauteil ausgeführt, bei welchem zwischen dem Heizleiter und der Trägerplatte eine Zwischenschicht zur in Bezug auf die Fläche gleichmäßigen Verteilung der Wärme angeordnet ist, wobei diese Zwischenschicht aus einem Material gebildet ist, das gegenüber der Trägerplatte größere Wärmeleitfähigkeit aufweist. Insbesondere besteht die Flächenheizeinrichtung aus einem gleichmäßigen Schichtverbund von der Trägerplatte, der Zwischenschicht, dem Heizleiter und bevorzugt einer weiteren isolierenden Schicht, wobei der Heizleiter in Mäanderform ausgebildet sein kann.A Flächenheizeinrichtung invention is designed for heating water in a tub of a washing machine and includes a flat support plate which can be attached to the tub, in particular such that the support plate conceals a recess formed in a wall of the tub. The surface heating device also has a heating conductor designed as a conductor for generating heat for heating the liquor, wherein the heat is released through the carrier plate to the water. According to the invention, the surface heating device is designed as a sandwich component in which an intermediate layer is arranged between the heating conductor and the carrier plate for uniform distribution of the heat relative to the surface, this intermediate layer being formed from a material which has greater thermal conductivity relative to the carrier plate. In particular, the surface heating device consists of a uniform layer composite of the carrier plate, the intermediate layer, the heating conductor and preferably a further insulating layer, wherein the heating conductor may be formed in a meandering shape.
Die durch den Heizleiter bereitgestellte Wärme wird somit mittels der thermisch sehr gut leitfähigen Zwischenschicht über die Fläche homogen verteilt und von der Zwischenschicht durch die Trägerplatte hindurch an das Wasser abgegeben. Eine solche Flächenheizeinrichtung hat diverse Vorteile: Zum einen können somit lokale Überhitzungen durch Anlagerung von Kalk und Flusen im Laugenbehälter verhindert werden, weil die Zwischenschicht für eine homogene Wärmeverteilung über die Fläche der Zwischenschicht sorgt. Somit ergibt sich eine zuverlässige und betriebssichere Beheizung der Lauge im Laugenbehälter. Gegenüber einer herkömmlichen Rohrheizkörperheizung wird außerdem eine Wasser- und Energieeinsparung erzielt, etwa im Bereich 6 bis 8 %. Aufgrund der planaren bzw. flachen Geometrie der Flächenheizeinrichtung wird außerdem die Anlagerung von Flusen im Laugenbehälter vermieden. Ein weiterer Vorteil besteht darin, dass aufgrund der schlechteren Wärmeleitfähigkeit der Trägerplatte diese problemlos an dem Laugenbehälter montiert werden kann, ohne dass die Wärme auf den Laugenbehälter selbst übertragen wird. Die Wärmeübertragung durch die Trägerplatte hindurch an die im Laugenbehälter befindliche Lauge erfolgt nämlich aufgrund einer kleinen Dicke der Trägerplatte hauptsächlich in Richtung senkrecht zur Trägerplatte, während eine Wärmeübertragung in lateraler Richtung (in der Ebene der Trägerplatte) aufgrund der schlechten Wärmeleitfähigkeit der Trägerplatte minimal ist. Dies hat Vorteile hinsichtlich der Befestigung der Flächenheizeinrichtung an dem Laugenbehälter. Die Trägerplatte kann nämlich beispielsweise durch Reibschweißen mit dem Laugenbehälter verbunden werden, während die anderen Komponenten der Flächenheizeinrichtung, die von dem Inneren des Laugenbehälters abgewandt sind, mit dem Material des Laugenbehälters nicht in Berührung kommen.The heat provided by the heating conductor is thus homogeneously distributed over the surface by means of the thermally highly conductive intermediate layer and discharged from the intermediate layer through the support plate to the water. Such surface heating device has various advantages: First, thus local overheating can be prevented by addition of lime and lint in the tub, because the intermediate layer provides for a homogeneous heat distribution over the surface of the intermediate layer. This results in a reliable and reliable heating of the liquor in the tub. Compared to a conventional tubular heater heating also a water and energy saving is achieved, for example in the
Ferner ist vorgesehen, dass die Zwischenschicht eine gegenüber der Trägerplatte größere thermische Kapazität aufweist. Die Zwischenschicht kann somit deutlich mehr thermische Energie als die Trägerplatte speichern, wodurch insbesondere Wärmestau vermieden und Wärmeverluste reduziert werden können.It is further provided that the intermediate layer has a relative to the carrier plate greater thermal capacity. The intermediate layer can thus store significantly more thermal energy than the carrier plate, which in particular heat accumulation can be avoided and heat losses can be reduced.
Es erweist sich als vorteilhaft, wenn die Zwischenschicht aus einem Material gebildet ist, dessen Wärmeleitfähigkeit von der Wärmeleitfähigkeit der Trägerplatte um einen Faktor größer als 5, insbesondere einen Faktor größer als 10, höher ist. Beispielsweise ist die Zwischenschicht aus einem Material gebildet, dessen Wärmeleitfähigkeit von der Wärmeleitfähigkeit der Trägerplatte um einen Faktor größer ist, der in einem Wertebereich von 5 bis 20, insbesondere von 10 bis 20, liegt. Gerade dann kann bei einer relativ geringen Dicke der Trägerplatte einerseits eine zuverlässige Wärmeübertragung an die Lauge ermöglicht werden, während andererseits die Wärmeübertragung seitlich an den Laugenbehälter verhindert werden kann.It proves to be advantageous if the intermediate layer is formed from a material whose thermal conductivity of the thermal conductivity of the support plate by a factor greater than 5, in particular a factor greater than 10, is higher. For example, the intermediate layer is formed of a material whose thermal conductivity of the Thermal conductivity of the support plate is greater by a factor which is in a range of from 5 to 20, in particular from 10 to 20. Just then a reliable heat transfer to the liquor can be made possible on the one hand with a relatively small thickness of the support plate, on the other hand, the heat transfer can be prevented laterally to the tub.
Bevorzugt ist die Trägerplatte aus Edelstahl gebildet. Diese Ausführungsform hat Vorteile hinsichtlich der Lebensdauer der Flächenheizeinrichtung. Es ist nämlich die Trägerplatte, welche dem Inneren des Laugenbehälters zugewandt und somit der Lauge ausgesetzt ist. Durch die Ausgestaltung der Trägerplatte aus Edelstahl wird somit eine Korrosion der Flächenheizeinrichtung verhindert. Edelstahl weist außerdem eine Wärmeleitfähigkeit auf, die relativ gering und somit besonders gut für die vorliegende Anwendung geeignet ist. So kann die Wärme durch das Material der Trägerplatte hindurch zuverlässig und wirkungsvoll an die Lauge abgegeben werden, während in Richtung parallel zur Trägerplatte nur eine minimale oder, wenn möglich, im Wesentlichen keine Wärmeübertragung, stattfindet.Preferably, the support plate is formed of stainless steel. This embodiment has advantages in terms of the life of the surface heater. It is namely the support plate, which faces the interior of the tub and thus exposed to the liquor. The design of the support plate made of stainless steel thus corrosion of the surface heater is prevented. Stainless steel also has a thermal conductivity which is relatively low and therefore particularly suitable for the present application. Thus, the heat can be reliably and effectively delivered through the material of the support plate to the liquor, while in the direction parallel to the support plate takes place only a minimal or, if possible, substantially no heat transfer.
Die Wärmeleitfähigkeit der Trägerplatte ist bevorzugt kleiner als 20 W/mK.The thermal conductivity of the carrier plate is preferably less than 20 W / mK.
Vorzugsweise ist die Zwischenschicht aus einem Material gebildet, dessen Wärmeleitfähigkeit größer als 150 W/mK, insbesondere größer als 200 W/mK, ist. Dies sorgt für eine homogene Wärmeverteilung über die gesamte Fläche der Zwischenschicht und somit für eine wirkungsvolle und zuverlässige sowie in Bezug auf die Fläche gleichmäßige Wärmeabgabe an die Lauge im Laugenbehälter.Preferably, the intermediate layer is formed of a material whose thermal conductivity is greater than 150 W / mK, in particular greater than 200 W / mK. This ensures a homogeneous heat distribution over the entire surface of the intermediate layer and thus for an effective and reliable as well as with respect to the surface uniform heat transfer to the liquor in the tub.
Es hat sich als vorteilhaft erwiesen, wenn die Zwischenschicht aus Aluminium gebildet ist. Diese Ausführungsform hat fertigungstechnische Vorteile, weil die Aluminiumschicht ohne viel Aufwand auf die Trägerplatte aufgebracht werden kann, beispielsweise durch Löten, Walzen oder Schweißen, insbesondere Reibschweißen.It has proved to be advantageous if the intermediate layer is formed from aluminum. This embodiment has manufacturing advantages, because the aluminum layer can be applied to the carrier plate without much effort, for example by soldering, rolling or welding, in particular friction welding.
Vorzugsweise ist der Heizleiter durch thermisches Spritzen, insbesondere durch Plasmaspritzen, aufgebracht. Dies bedeutet, dass der Heizleiter in einem Plasmaprozess aufgebracht wird, was insbesondere den Vorteil hat, dass für den Heizleiter Materialien verwendet werden können, die einen relativ hohen Schmelzpunkt aufweisen. Solche Materialien können besonders vorteilhaft als Heizleiter eingesetzt werden. Außerdem kann somit die Flächenheizeinrichtung kostengünstig durch den bekannten Plasmaabscheidungsprozess hergestellt werden.The heating conductor is preferably applied by thermal spraying, in particular by plasma spraying. This means that the heating conductor is applied in a plasma process, which in particular has the advantage that materials can be used for the heating conductor, which have a relatively high melting point. Such materials can be used particularly advantageously as heating conductors. In addition, thus, the surface heater can be inexpensively manufactured by the known plasma deposition process.
In einer Ausführungsform kann die Flächenheizeinrichtung auch gewölbt bzw. gebogen ausgebildet sein. Somit wird eine Anpassung der geometrischen Form an die kreisförmige Form des Laugenbehälters ermöglicht. Insbesondere dann, wenn die Trägerplatte innerhalb einer Aussparung im Laugenbehälter eingesetzt wird und durch die Trägerplatte somit ein Bereich der Wandung des Laugenbehälters gebildet wird, können somit Abflachungen im Laugenbehälter verhindert werden. Außerdem kann somit eine zuverlässige und gut haftende Verbindung zwischen dem Laugenbehälter und der Flächenheizeinrichtung ermöglicht werden.In one embodiment, the surface heating device may also be arched or bent. Thus, an adaptation of the geometric shape to the circular Shape of the tub allows. In particular, when the support plate is inserted within a recess in the tub and thus a portion of the wall of the tub is formed by the support plate, thus flattening in the tub can be prevented. In addition, thus a reliable and well-adhering connection between the tub and the surface heater can be made possible.
Die Erfindung ist jedoch nicht auf eine gewölbte Ausgestaltung der Flächenheizeinrichtung beschränkt. Es ist auch möglich, die Flächenheizeinrichtung eben bzw. plan auszugestalten, was wiederum Vorteile hinsichtlich der Herstellung der Flächenheizeinrichtung bietet.However, the invention is not limited to a curved configuration of the surface heating device. It is also possible to design the surface heating device flat or planar, which in turn offers advantages with regard to the production of the surface heating device.
Es erweist sich als vorteilhaft, wenn die Trägerplatte einen über die Zwischenschicht hinaus ragenden bzw. hervorstehenden seitlichen, insbesondere vollumfänglich um die Zwischenschicht herum verlaufenden Randbereich aufweist, über welchen die Trägerplatte und somit die gesamte Flächenheizeinrichtung an dem Laugenbehälter angebracht wird. Dies bedeutet also, dass die Trägerplatte insgesamt größer als die Zwischenschicht ist, so dass der genannte Randbereich frei von der Zwischenschicht ausgebildet ist. Eine solche Ausgestaltung der Trägerplatte hat den Vorteil, dass über den Randbereich die Flächenheizeinrichtung wirkungsvoll an dem Laugenbehälter montiert bzw. fixiert werden kann, während die Zwischenschicht in Überdeckung mit einer durchgängigen Aussparung des Laugenbehälters angeordnet wird und somit nicht in Kontakt mit dem Laugenbehälter gelangt.It proves to be advantageous if the carrier plate has a side region that protrudes beyond the intermediate layer or protrudes laterally, in particular completely around the intermediate layer, over which the carrier plate and thus the entire surface heating device is attached to the tub. This means, therefore, that the carrier plate as a whole is larger than the intermediate layer, so that said edge region is formed free of the intermediate layer. Such an embodiment of the carrier plate has the advantage that over the edge region, the surface heater can be effectively mounted or fixed to the tub, while the intermediate layer is arranged in register with a continuous recess of the tub and thus does not come into contact with the tub.
Zwischen dem Heizleiter und der Zwischenschicht ist des Weiteren vorzugsweise eine zusätzliche Schicht vorgesehen, welche aus einem elektrisch isolierenden Material gebildet ist. Auf diese Isolationsschicht, insbesondere durch Plasmaspritzen erzeugte Isolierschicht, ist der Heizleiter dann direkt aufgebracht. Somit kann der Heizleiter von der Zwischenschicht elektrisch isoliert werden. Diese Isolationsschicht kann beispielsweise aus Aluminiumoxid gebildet sein.Furthermore, between the heating conductor and the intermediate layer, an additional layer is preferably provided, which is formed from an electrically insulating material. On this insulating layer, in particular generated by plasma spraying insulating layer, the heating element is then applied directly. Thus, the heating conductor can be electrically isolated from the intermediate layer. This insulating layer may be formed, for example, of aluminum oxide.
Die Trägerplatte - bevorzugt aus Edelstahl - weist beispielsweise eine Dicke auf, die in einem Wertebereich von 0,3 bis 1,2 mm liegt, insbesondere in einem Wertebereich von 0,7 bis 0,9 mm.The support plate - preferably made of stainless steel - has, for example, a thickness which is in a value range of 0.3 to 1.2 mm, in particular in a value range of 0.7 to 0.9 mm.
Die Zwischenschicht - insbesondere aus Aluminium - kann eine Dicke aufweisen, die in einem Wertebereich von 0,2 bis 1 mm, insbesondere von 0,4 bis 0,6 mm, liegt.The intermediate layer-in particular of aluminum-can have a thickness which lies in a value range from 0.2 to 1 mm, in particular from 0.4 to 0.6 mm.
Die genannte Isolationsschicht kann beispielsweise eine Dicke aufweisen, die in einem Wertebereich von 0,1 bis 0,25 mm, insbesondere von 0,2 mm, liegt.The said insulation layer may for example have a thickness which is in a value range of 0.1 to 0.25 mm, in particular of 0.2 mm.
Die Dicke der Leiterbahn des Heizleiters liegt bevorzugt im Wertebereich von 10 bis 30 µm, insbesondere von 20 µm.The thickness of the conductor track of the heating conductor is preferably in the value range of 10 to 30 .mu.m, in particular of 20 microns.
Der Heizleiter ist vorzugsweise in Form einer mäanderförmigen Leiterbahn bereitgestellt, welche auch mehrere Mäanderschlingen aufweisen kann. Somit ergibt sich eine flächige Wärmeerzeugung durch den Heizleiter. Der gesamte Heizleiter ist dabei in Überdeckung bzw. Überlappung mit der Zwischenschicht und der Trägerplatte angeordnet, so dass sich insgesamt ein Sandwich-Bauelement ergibt.The heating conductor is preferably provided in the form of a meander-shaped conductor track, which may also have a plurality of meander loops. This results in a planar heat generation by the heating conductor. The entire heating conductor is arranged in overlap or overlap with the intermediate layer and the carrier plate, so that the overall result is a sandwich component.
Die Erfindung betrifft außerdem eine Waschmaschine mit einem Laugenbehälter und einer erfindungsgemäßen Flächenheizeinrichtung. Der Laugenbehälter weist eine durchgängige Aussparung auf, die durch die Trägerplatte überdeckt ist, so dass die Trägerplatte einen Bereich einer Wandung des Laugenbehälters bildet und dabei dem Innenraum des Laugenbehälters zugewandt ist, während der Heizleiter von dem Innenraum abgewandt ist. Die Zwischenschicht und der Heizleiter sind dabei in Überdeckung mit der durchgängigen Aussparung des Laugenbehälters angeordnet.The invention also relates to a washing machine with a tub and a surface heating device according to the invention. The tub has a continuous recess which is covered by the support plate, so that the support plate forms an area of a wall of the tub and thereby faces the interior of the tub, while the heating element is remote from the interior. The intermediate layer and the heating element are arranged in coincidence with the continuous recess of the tub.
Bei der Waschmaschine ist die Trägerplatte vorzugsweise durch Schweißen, insbesondere Reibschweißen, mit dem Laugenbehälter verbunden. Als Reibschweißen kann beispielsweise das Ultraschallschweißen vorgesehen sein. Außerdem kann die Trägerplatte mittelbar mit dem Laugenbehälter verbunden sein. Dazu ist vorzugsweise die Trägerplatte mit einem Befestigungselement bzw. einem Adapter dichtend verbunden, wobei der Adapter beispielsweise mittels Reibschweißen mit dem Laugenbehälter verbunden ist, wobei die vorstehend genannten Verbindungsverfahren der Trägerplatte auch für diese Verbindung des Adapter angewendet werden kann. Vorzugsweise ist der Adapter aus Kunststoff hergestellt.In the washing machine, the support plate is preferably connected by welding, in particular friction welding, with the tub. As a friction welding, for example, the ultrasonic welding can be provided. In addition, the carrier plate can be indirectly connected to the tub. For this purpose, preferably, the support plate is sealingly connected to a fastener or an adapter, wherein the adapter is connected for example by means of friction welding to the tub, wherein the above-mentioned connection method of the support plate can also be used for this connection of the adapter. Preferably, the adapter is made of plastic.
Es ist jedoch auch möglich, für die Verbindung der Trägerplatte oder des Adapters mit dem Laugenbehälters andere Verbindungstechniken anzuwenden, wie beispielsweise eine Klebeverbindung, Schnappverbindung und/oder Schraubverbindung. Ferner ist es auch möglich, die Trägerplatte oder den Adapter mit dem Laugenbehälter mittels Einspritzen oder Umspritzen zu verbinden, welches insbesondere gleichzeitig beim Spritzgießen des Laugenbehälters erfolgen kann.However, it is also possible to use for the connection of the support plate or the adapter with the tub other connection techniques, such as an adhesive connection, snap connection and / or screw connection. Furthermore, it is also possible to connect the carrier plate or the adapter with the tub by means of injection molding or encapsulation, which can be done in particular at the same time during injection molding of the tub.
Zur Abdichtung der Verbindung wird vorzugsweise eine umlaufende Dichtung eingesetzt.To seal the connection, a circumferential seal is preferably used.
Ein erfindungsgemäßes Verfahren dient zum Herstellen einer Flächenheizeinrichtung zum Aufheizen von Lauge in einem Laugenbehälter einer Waschmaschine, durch Bereitstellen einer flachen Trägerplatte, die an dem Laugenbehälter angebracht wird, und Bereitstellen eines Heizleiters in Form einer Leiterbahn zum Erzeugen von Wärme, wobei die Wärme durch die Trägerplatte hindurch an die Lauge abgegeben wird, und wobei zur gleichmäßigen Verteilung der Wärme eine Zwischenschicht zwischen dem Heizleiter und der Trägerplatte angeordnet und aus einem Material gebildet wird, das gegenüber der Trägerplatte eine größere Wärmeleitfähigkeit und größere thermische Kapazität aufweist.A method according to the invention for producing a surface heating device for heating liquor in a tub of a washing machine, by providing a flat support plate, which is attached to the tub, and providing a heating conductor in the form of a conductor for generating heat, wherein the heat through the support plate is passed through to the liquor, and wherein for the even distribution of heat, an intermediate layer between the heating conductor and the carrier plate is arranged and formed of a material having a greater thermal conductivity and greater thermal capacity relative to the carrier plate.
Der Heizleiter kann durch Plasmaspritzen aufgebracht werden.The heating conductor can be applied by plasma spraying.
Die Trägerplatte kann durch Reibschweißen mit dem Laugenbehälter verbunden werden.The carrier plate can be connected by friction welding with the tub.
Die mit Bezug auf die erfindungsgemäße Flächenheizeinrichtung vorgestellten bevorzugten Ausführungsformen und deren Vorteile gelten entsprechend für die erfindungsgemäße Waschmaschine sowie für das erfindungsgemäße Verfahren.The preferred embodiments presented with reference to the surface heating device according to the invention and their advantages apply correspondingly to the washing machine according to the invention and to the method according to the invention.
Weitere Merkmale der Erfindung ergeben sich aus den Ansprüchen, den Figuren und der Figurenbeschreibung. Alle vorstehend in der Beschreibung genannten Merkmale und Merkmalskombinationen sowie die nachfolgend in der Figurenbeschreibung genannten und/oder in den Figuren alleine gezeigten Merkmale und Merkmalskombinationen sind nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder aber in Alleinstellung verwendbar.Further features of the invention will become apparent from the claims, the figures and the description of the figures. All the features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively indicated combination but also in other combinations or alone.
Die Erfindung wird nun anhand eines bevorzugten Ausführungsbeispiels sowie unter Bezugnahme auf die beigefügten Zeichnungen näher erläutert.The invention will now be described with reference to a preferred embodiment and with reference to the accompanying drawings.
Es zeigen:
- Fig. 1
- in schematischer Darstellung eine Waschmaschine gemäß einer Ausführungsform der Erfindung, und
- Fig. 2
- in schematischer und perspektivischer Darstellung eine Flächenheizeinrichtung gemäß einer Ausführungsform der Erfindung.
- Fig. 1
- a schematic representation of a washing machine according to an embodiment of the invention, and
- Fig. 2
- in a schematic and perspective view of a Flächenheizeinrichtung according to an embodiment of the invention.
In
Im Ausführungsbeispiel ist die Flächenheizeinrichtung 6 gewölbt bzw. gebogen ausgebildet und somit an die geometrische Form des Laugenbehälters 4 angepasst.In the exemplary embodiment, the
Die Flächenheizeinrichtung 6 ist im Detail in
Auf die Trägerplatte 7, nämlich auf eine in
Die Zwischenschicht 10 kann beispielsweise durch Löten oder Walzen auf die Trägerplatte 7 aufgebracht werden. Die Zwischenschicht 10 kann dabei beispielweise eine Dicke von 0,4 bis 0,6 mm, typisch von 0,5 mm aufweisen.The
Auf die Zwischenschicht 10 wiederum ist eine Isolationsschicht 11 aufgebracht, beispielsweise aus Aluminiumoxid. Diese Isolationsschicht 11 dient der elektrischen Isolierung zwischen der Zwischenschicht 10 einerseits und einem Heizleiter 12 andererseits, welcher in Form einer Leiterbahn 13 auf die Isolationsschicht 11 direkt aufgetragen ist. Die Herstellung des Heizleiters 12 kann beispielsweise in einem Plasmaprozess durchgeführt werden, so dass der Heizleiter durch Plasmaspritzen auf die Isolationsschicht 11 aufgetragen wird. Der Heizleiter 12 ist dabei in Form einer mäanderförmigen Leiterbahn 13 mit einer Vielzahl von Mäanderschlingen 14 ausgebildet. Der Heizleiter ist ferner mit einem Stecker 15 verbunden, über welchen der Heizleiter 12 mit elektrischer Spannung beaufschlagt werden kann. In den Heizleiter 12 können auch optional Sicherheitselemente 16 integriert werden, welche nach Überschreiten einer vorgegebenen Stromstärke oder einer vorgegebenen Abschalttemperatur den elektrischen Stromkreis öffnen. Diese Sicherheitselemente 16 können beispielsweise als Schmelzsicherung ausgeführt sein.In turn, an insulating
Die Flächenheizeinrichtung 6 kann auch einen oder mehrere Temperatursensoren 17 aufweisen. Ein solcher Temperatursensor 17 kann beispielsweise an der Trägerplatte 7, insbesondere thermisch vom Heizleiter entkoppelt, angeordnet sein und mit dieser in Kontakt stehen. Mittels dieses Temperatursensors 17 wird dann die Temperatur der Lauge im Laugenbehälter 4 gemessen, und abhängig von dieser gemessenen Temperatur kann der Strom durch den Heizleiter 12 und somit die Temperatur gesteuert werden. Ergänzend oder alternativ kann auch ein Temperatursensor im Bereich der Isolationsschicht 11 angeordnet sein. Die Temperatursensoren 17 können über den Stecker 15 elektrisch kontaktiert werden.The
Die Flächenheizeinrichtung 6 ist somit insgesamt in Form eines Sandwich-Bauteils bereitgestellt, welches mehrere Schichten aufweist, nämlich die Trägerplatte 7, die Zwischenschicht 10, die Isolationsschicht 11 sowie den Heizleiter 12. Die Trägerplatte 7 ist bevorzugt eine durchgängig homogen ausgebildete Platte ohne Durchgangsöffnungen unterhalb der Zwischenschicht 10. Dies bedeutet, dass ausschließlich die Trägerplatte 7 in Kontakt mit der Lauge gelangt und die weiteren Schichten von der Lauge abgewandt sind. Weil die Trägerplatte 7 vorzugsweise aus Edelstahl gebildet ist, kommt es zu keiner Korrosion im Betrieb der Waschmaschine 1. Der Heizleiter 12 und die weiteren Schichten liegen außerhalb des Laugenbehälters 4.The
Beim Aufheizen von Lauge wird der Heizleiter 12 mit elektrischem Strom durchflossen und erzeugt somit Wärme. Diese Wärme wird durch die Zwischenschicht 10 aus Aluminium aufgenommen und gespeichert sowie durch das Material der Trägerplatte 7 hindurch an die Lauge im Laugenbehälter 4 abgegeben. Die Wärmeleitfähigkeit der Trägerplatte 7 ist dabei so gering, insbesondere kleiner als 20 w/mK, dass die Wärmeübertragung über die Trägerplatte 7 grundsätzlich ausschließlich in Richtung senkrecht zur Trägerplatte 7 aufgrund der sehr geringen Dicke erfolgt, während im Wesentlichen keine Wärmeübertragung in Richtung parallel zur Trägerplatte 7 und somit zu dem Randbereich 8 stattfindet. Somit wird auch keine Wärme an das Material des Laugenbehälters 4 selbst übertragen.During the heating of liquor, the
Zwar ist die Flächenheizeinrichtung 6 im Beispiel gemäß
Wie ausgeführt, wird die Trägerplatte 7 in die entsprechende Aussparung im unteren Bereich der Wandung des Laugenbehälters 4 montiert, wobei die Trägerplatte 7 dem Inneren des Laugenbehälters 4 zugewandt wird und somit über ihre Rückseite 18 mit dem Laugenbehälter 4 verbunden wird.As stated, the
Optional können auch weitere Schicht- oder SMD-Bauteile in die Flächenheizeinrichtung 6 integriert werden, wie beispielsweise ein Thermostat oder weitere Sensoren.Optionally, other layer or SMD components can be integrated into the
- 11
- WaschmaschineWashing machine
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- Wäschetrommelwashing drum
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- Drehachseaxis of rotation
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- Laugenbehältertub
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- Bodenground
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- Flächenheizeinrichtungpanel heating
- 77
- Trägerplattesupport plate
- 88th
- Randbereichborder area
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- Vorderseitefront
- 1010
- Zwischenschichtinterlayer
- 1111
- Isolationsschichtinsulation layer
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- Heizleiterheating conductor
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- Leiterbahnconductor path
- 1414
- Mäanderschlingenmeander loops
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- Steckerplug
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- Sicherheitselementesecurity elements
- 1717
- Temperatursensortemperature sensor
- 1818
- Rückseiteback
Claims (14)
- Panel heating device (6) for heating water in a washing tub (4) of a washing machine (1), having a flat carrier plate (7) to be attached to the washing tub (4) and having a heating conductor (12) configured as a conductor track (13) for generating heat, wherein the heat is able to be output to the water through the carrier plate (7), wherein an intermediate layer (10) with a thermal conductivity that is greater than that of the carrier plate (7) is arranged between the heating conductor (12) and the carrier plate (7) and the intermediate layer (10) is configured for homogeneous distribution of the heat, characterised in that the intermediate layer (10) has a thermal capacity that is greater than that of the carrier plate (7).
- Panel heating device (6) according to claim 1, characterised in that the intermediate layer (10) is formed from a material, the thermal conductivity of which is higher by a factor that is greater than 5, in particular greater than 10, than the thermal conductivity of the carrier plate (7).
- Panel heating device (6) according to one of the preceding claims, characterised in that the carrier plate (7) is formed from stainless steel.
- Panel heating device (6) according to one of the preceding claims, characterised in that the intermediate layer (10) is formed from a material, which has a thermal conductivity greater than 150 W/mK, in particular greater than 200 W/mK.
- Panel heating device (6) according to one of the preceding claims, characterised in that the intermediate layer (10) is formed from aluminium.
- Panel heating device (6) according to one of the preceding claims, characterised in that an electrically insulating layer (11), in particular made of aluminium oxide, is arranged between the intermediate layer (10) and the heating conductor (12).
- Panel heating device (6) according to one of the preceding claims, characterised in that the heating conductor (12) is attached by thermal spraying, in particular by plasma spraying.
- Panel heating device (6) according to one of the preceding claims, characterised in that the panel heating device (6) is configured as arched.
- Panel heating device (6) according to one of the preceding claims, characterised in that the carrier plate (7) has an edge region (8) that projects beyond the intermediate layer (10), by way of which the carrier plate (7) can be attached to the washing tub (4).
- Washing machine (1) having a washing tub (4) and a panel heating device (6) according to one of the preceding claims, wherein the washing tub (4) has a continuous cutout, which is covered by the carrier plate (7), so that the carrier plate (7) forms a region of a wall of the washing tub (4) and wherein the carrier plate (7) faces the interior of the washing tub (4).
- Washing machine (1) according to claim 11, characterised in that the carrier plate (7) or an adapter connected to the carrier plate (7) is connected to the washing tub (4) by friction welding.
- Method for producing a panel heating device (6) for heating water in a washing tub (4) of a washing machine (1), by providing a flat carrier plate (7), which is attached to the washing tub (4), and providing a heating conductor (12) in the form of a conductor track (13) for generating heat, the heat being output to the water through the carrier plate (7), wherein an intermediate layer (10) is arranged between the heating conductor (12) and the carrier plate (7) for homogeneous heat distribution and is formed from a material that has a greater thermal conductivity than the carrier plate (7), characterised in that the intermediate layer (10) is formed from a material that has a thermal capacity that is greater than that of the carrier plate (7).
- Method according to claim 12, characterised in that the heating conductor (12) is attached by thermal spraying, in particular by plasma spraying.
- Method according to claim 12 or 13, characterised in that the carrier plate (7) or an adapter connected to the carrier plate (7) is connected to the washing tub (4) by friction welding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14716819T PL2986769T3 (en) | 2013-04-19 | 2014-04-10 | Panel heating device for heating water in a washing tub, washing machine and method for producing a panel heating device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013207088.8A DE102013207088A1 (en) | 2013-04-19 | 2013-04-19 | Surface heating device for heating water in a tub, washing machine and method for producing a Flächenheizeinrichtung |
PCT/EP2014/057297 WO2014170210A1 (en) | 2013-04-19 | 2014-04-10 | Panel heating device for heating water in a washing tub, washing machine and method for producing a panel heating device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2986769A1 EP2986769A1 (en) | 2016-02-24 |
EP2986769B1 true EP2986769B1 (en) | 2017-06-14 |
Family
ID=50478841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14716819.9A Active EP2986769B1 (en) | 2013-04-19 | 2014-04-10 | Panel heating device for heating water in a washing tub, washing machine and method for producing a panel heating device |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2986769B1 (en) |
CN (1) | CN105308231B (en) |
DE (1) | DE102013207088A1 (en) |
PL (1) | PL2986769T3 (en) |
RU (1) | RU2624725C2 (en) |
WO (1) | WO2014170210A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102526715B1 (en) * | 2018-02-23 | 2023-04-28 | 엘지전자 주식회사 | Washing machine |
KR102526714B1 (en) | 2018-02-23 | 2023-04-28 | 엘지전자 주식회사 | Washing machine |
CN108642809A (en) * | 2018-04-03 | 2018-10-12 | 青岛海尔滚筒洗衣机有限公司 | A kind of washing machine |
DE102018208252A1 (en) * | 2018-05-25 | 2019-11-28 | E.G.O. Elektro-Gerätebau GmbH | Method for producing a heating device and heating device produced therewith |
KR102661664B1 (en) * | 2019-01-10 | 2024-04-29 | 엘지전자 주식회사 | laundry machine having an induction heater |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1006951B (en) * | 1987-05-16 | 1990-02-21 | 北京市太阳能研究所 | Pyroelectrics and its technology |
IT1225119B (en) * | 1988-07-25 | 1990-11-02 | Zanussi A Spa Industrie | HEATING DEVICE FOR WASHING MACHINES AND / OR LINEN DRYERS |
US6150643A (en) * | 1999-06-08 | 2000-11-21 | Koyo Thermo Systems Co., Ltd. | Insulating material, electrical heating unit employing same, and manufacturing method therefor |
DE10053415A1 (en) * | 2000-10-27 | 2002-05-29 | Bsh Bosch Siemens Hausgeraete | Electric radiator |
CN101638765A (en) * | 2000-11-29 | 2010-02-03 | 萨莫希雷梅克斯公司 | Resistive heaters and uses thereof |
DE10145702A1 (en) * | 2001-09-17 | 2003-04-17 | Bleckmann Gmbh Lamprechtshause | Flat heating profile for direct medium heating |
DE10232182A1 (en) * | 2002-07-16 | 2004-03-11 | BSH Bosch und Siemens Hausgeräte GmbH | Safety device for a device with a heating element |
DE20301108U1 (en) * | 2003-01-24 | 2004-03-04 | Eichenauer Heizelemente Gmbh & Co. Kg | Method for heating the wash water in a horizontal drum automatic clothes washing machine has a flat plate heater attached at the lowest point in the outer drum with a seal |
FR2940981B1 (en) * | 2009-01-13 | 2011-02-18 | Seb Sa | STEAM IRON COMPRISING A HEATING BODY HAVING AN INSERT |
-
2013
- 2013-04-19 DE DE102013207088.8A patent/DE102013207088A1/en not_active Ceased
-
2014
- 2014-04-10 PL PL14716819T patent/PL2986769T3/en unknown
- 2014-04-10 CN CN201480021358.0A patent/CN105308231B/en active Active
- 2014-04-10 EP EP14716819.9A patent/EP2986769B1/en active Active
- 2014-04-10 WO PCT/EP2014/057297 patent/WO2014170210A1/en active Application Filing
- 2014-04-10 RU RU2015145146A patent/RU2624725C2/en active
Also Published As
Publication number | Publication date |
---|---|
WO2014170210A1 (en) | 2014-10-23 |
CN105308231B (en) | 2017-10-13 |
EP2986769A1 (en) | 2016-02-24 |
PL2986769T3 (en) | 2018-01-31 |
RU2624725C2 (en) | 2017-07-05 |
DE102013207088A1 (en) | 2014-10-23 |
RU2015145146A (en) | 2017-05-24 |
CN105308231A (en) | 2016-02-03 |
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