EP2926622B1 - Luftstromheizer - Google Patents

Luftstromheizer Download PDF

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Publication number
EP2926622B1
EP2926622B1 EP13830093.4A EP13830093A EP2926622B1 EP 2926622 B1 EP2926622 B1 EP 2926622B1 EP 13830093 A EP13830093 A EP 13830093A EP 2926622 B1 EP2926622 B1 EP 2926622B1
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EP
European Patent Office
Prior art keywords
heating
support
insulating support
shows
container
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.)
Active
Application number
EP13830093.4A
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English (en)
French (fr)
Other versions
EP2926622A1 (de
Inventor
Federico ZOPPAS
Angelo Irrera
Daniel Cosmin GUREAN
Gianni Palu'
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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Publication of EP2926622A1 publication Critical patent/EP2926622A1/de
Application granted granted Critical
Publication of EP2926622B1 publication Critical patent/EP2926622B1/de
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the present invention relates to a heating resistor used, for example, in heaters for tumble driers when a flow of hot air needs to be produced.
  • Heaters for heating a flow of air are used, among other applications, in household appliances, such as tumble driers.
  • a heater generally comprises a plurality of resistive wires wound as a spiral longitudinally along their supports arranged parallel to each other, see Fig.1 .
  • the existing technology includes the use of resistive wires wound as a spiral and supported by insulating supports made of appropriate material, e.g. mica or ceramic. Generally, such supports have a planar development perpendicular to the development axes of said windings.
  • the resistive filament is connected electrically to the connectors accommodated in a specific insulating block by means of appropriately crimped wiring.
  • a safety thermostat is connected in most cases between the external connection and the internal resistive filament.
  • Fig. 1 shows an air flow heater 100 which comprises a plurality of resistive wires 5 wound about longitudinal insulating supports 4, supported, in turn, by other insulating supports 7, generally made of ceramic, and a container 3, a thermostat 18, a thermistor 19, the connection wiring 9, an electric connector 22, and insulating supports 21 made of mica perpendicular thereto.
  • "Flat" insulating supports are three-dimensional supports, one dimension of which is negligible with respect to the two other.
  • the insulating support 4 according to the solution disclosed in DE1615246 tends to be distorted on the long term due to the combined effect of thermal and micro-climatic stresses. Such a distortion leads to temperature concentrations over time and the electric safety distances are reduced.
  • Fig. 5 shows a photograph of the distortions of a resistive element of the prior art
  • Fig. 6 shows a study of the local distortions of the supporting element of the winding, which results, as seen, in a marked bulging of the element itself. This phenomenon is due to the fact that the air flow which strikes the element is not uniform.
  • the power distribution should compensate such a lack of uniformity: the power should be lower where the air flow is lower to avoid concentrations of heat. It is neither convenient nor practical to dose the power as described due to the spiral-shaped architecture of the product.
  • problems are also related to the assembly of the spiral-shaped solution that includes the use of thin metal rods 2 ( Fig. 7 ) which are to be inserted in specific holes of the insulating supports made of mica which are difficult to handle because they are very small and difficult to insert in the corresponding items made of mica. Therefore, the need is felt to make a heating element wound as a spiral about an insulating support element which allows to overcome the aforesaid drawbacks.
  • GB 2 089 626 discloses a heater for air from a cross flow fan that comprises a bottom wall, top wall and two end walls and a heating element comprising four resistance coils. Each coil is supported on a supporting former, which is respectively disposed longitudinally inside its corresponding coil with a slide fit and extends the full length of the coil so as to support the coil along its full length.
  • a heat exchanger for a convector heater in which each coil thereof is also supported on a respective former disposed longitudinally therein with a slide fit, is also described.
  • EP 1 947 908 shows a heating filament arrangement that has a heat conductor wound in areas of a heating filament for converting electric energy into heat energy.
  • a protection element runs in axial direction of the heating filament. The ratio between the width of the protection element to the axial distance of the axial end of the supporting element for the nearest crossing point is more than or equal to three.
  • the heat conductor crosses a side surface of the protection element.
  • WO 2011 121577 discloses an electric air heater, comprising at least one heating element provided with an insulated supporting element on which at least one resistance wire is wound.
  • the heater comprises an electrical connector clamps, with at least one electrical pin.
  • the heating element taps one end of the resistance wire.
  • the electrical connections of a thermostat and/or a thermistor are made by means of electrical tracks formed directly on a surface of the housing to which the thermostat and/or the thermistor are attached.
  • the electrical connector clamps the surface with at least one further electrical pin.
  • DE 20 2004 019912 shows a device having a carrying body with two closely stacked plates, each holding at least one resistance wire with opposing slotted edges and movable relative to each other perpendicular to the edges.
  • the slots have a first entry region leading in from the edge and a connected expansion region towards the plate interior.
  • the plates can be moved from a position with the entry regions overlapping to a position with the entry regions covered and the expansion regions forming a continuous throughway.
  • the present invention thus is directed at reaching the objects described above by providing a device for heating a flow of air for household appliances, according to claim 1, which device comprises at least one heating element provided with a three-dimensional insulating support, wherein the value of the thickness is much smaller than the value of length A and that of width B, and with a resistive wire wound as a spiral about said support as to essentially define a flat winding, the device being characterized in that the ratio B/A between width B and length A of the insulating support (4) is smaller than 1/4.
  • the pitch of the turns is not uniform, so that the radiated power is locally variable to solve the non-uniformity of the air flow.
  • the insulating support of the winding includes relieving elements arranged longitudinally to contrast said distortions.
  • Figure 8 shows an embodiment of an insulating support made of mica according to the invention indicated with reference numeral 4.
  • the insulating support 4 made of mica has a flat rectangular shape with a B/A ratio between width and length typically smaller than 1/4; furthermore, appropriate relieving zones 1 which reduce the phenomenon of "bulging" are typically present in the central part of the support 4.
  • Empirical tests have demonstrated that the phenomenon of bulging is much more marked in presence of a continuous (i.e. not relieved) support made of mica. It has been also empirically determined that the phenomenon of bulging disappears when using supports made of mica with a B/A ratio lower than 1/4.
  • the winding operation is easy to implement by means of automatic machinery.
  • the technical solution according to the invention includes the use of a variable winding pitch of the resistive filament on the mica support in order to contrast the phenomenon of lack of temperature uniformity along the insulating element 4 caused by the fact that the air flow which enters into the heating element is not uniform.
  • Fig. 9 shows this type of solution, in which the mutual distance between turns 5-1 is greater than the mutual distance between turns 5-2.
  • a further embodiment of the thermal distribution of the resistive filament is obtained by appropriately offsetting the vertical positions of the heating elements.
  • Fig.10A shows an arrangement along a transversal plane with respect to the horizontal direction of the air flow between two pairs of heating elements according to the prior art
  • Fig. 10B shows the offset arrangement of the same elements according to the present invention.
  • the resistive elements are supported by vertical insulating elements 7 ( Fig. 11A-B ).
  • the vertical insulating elements 7 are inserted in the insulating supports 4 of the windings 5 by means of a simple snap-fitting mechanism ( Fig. 11A ).
  • Fig. 11B shows the system ready to be inserted in the container shown in Fig. 12 .
  • Fig. 13A-C shows an example of container 3 for accommodating different heating elements, i.e.
  • the container 3 is shaped as a rectangular parallelepiped formed by a bottom 23, two side walls 24 opposite to each other (while the other two side walls are missing to let air in and out) and finally by a removable lid 25 parallel to the bottom.
  • Bayonet-undercut systems are used for assembly as shown in the sequence of figures 13A-C .
  • the side walls 24 are provided with protruding vertical elements 26 at slots and recesses formed on the lid 25 on which the lid 29 itself is firmly anchored by means of a vertical movement ( Fig. 13A ) and a horizontal movement ( Fig. 13C ) of the lid 29 itself.
  • the vertical insulating elements 7, given their particular shape, are fit by means of a bayonet-undercut system onto the lid 25 of the container 3, as shown in the aforesaid sequence 13A-C.
  • an appropriate electric connection system and a particular shape of the horizontal support elements made of mica 5 is provided in order to facilitate the insertion of the vertical support elements 7.
  • Fig. 14 shows an example of horizontal insulating support 5 of the winding of the resistive wire 4 according to the invention. The figure shows that the particular shape 30 of the central and final part of the support 5 to facilitate the insertion of the vertical supports 7.
  • the electric connection in order to facilitate assembly consists of bands 31 for connecting the heating elements to each other and the heating elements to the external supply.
  • the resistive wire 5 is connected directly to the band 31, which in turn is connected to the power wire 32 which ends with a slot 33. In this manner, the resistive wire is connected directly to the power cables without needing a further wiring, which is costly in terms of time.
  • Fig. 15 shows a detail of this connection.
  • the invention is not limited to household tumble driers, but may be used in any type of device in which the heating of a flow of air is needed.
  • the elements and features illustrated in the various embodiments may be combined remaining within the scope of protection of the present invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Air-Conditioning For Vehicles (AREA)

Claims (5)

  1. Vorrichtung (100) zum Erhitzen einer Luftströmung für Einrichtungen zur Verwendung im Haushalt, die mindestens ein Heizelement umfasst, das mit einer dreidimensionalen isolierenden Stütze (4), wobei der Wert der Dicke in Bezug zu dem Wert der Länge A und demjenigen der Breite B zu vernachlässigen ist, und mit einem Widerstandsdraht (5) versehen ist, der als eine Spirale um die Stütze gewickelt ist, um im Wesentlichen eine flache Wicklung zu definieren, wobei das Verhältnis B/A zwischen der Breite B und der Länge A der isolierenden Stütze (4) kleiner als 1/4 ist; dadurch gekennzeichnet, dass Elemente (1) zum Abbau der durch die Erhitzung der Stütze verursachten Spannungen entlang der Länge A der isolierenden Stütze (4) eingesetzt sind, und dadurch, dass die Steigung der Spirale des Widerstandsdrahtes (5) variabel ist, um mit dem Phänomen des Fehlens von Temperaturgleichförmigkeit entlang der isolierenden Stütze (4) zu kontrastieren.
  2. Vorrichtung nach Anspruch 1, wobei die Heizelemente in einen Behälter (3) eingesetzt sind, der mit einem Einlass und einem Auslass für die Luftströmung versehen ist.
  3. Vorrichtung nach Anspruch 2, wobei die Heizelemente mit ihren Längsachsen im Wesentlichen parallel zu dem Einlass und Auslass des Behälters (3) und mit der Ebene angeordnet sind, die durch die zwei größeren Abmessungen A und B dargestellt ist, die quer zu der Ebene des Auslasses des Behälters (3) angeordnet sind.
  4. Vorrichtung nach Anspruch 3, die mindestens ein Paar von den Heizelementen umfasst, die entlang deren Breite beabstandet sind und an zwei versetzten Ebenen parallel zu der Ebene angeordnet sind, die durch die zwei größeren Abmessungen der isolierten Stütze (4) dargestellt ist.
  5. Vorrichtung nach dem vorhergehenden Anspruch, wobei die isolierende Stütze (4) aus Glimmer besteht.
EP13830093.4A 2012-11-30 2013-11-29 Luftstromheizer Active EP2926622B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000607A ITRM20120607A1 (it) 2012-11-30 2012-11-30 Riscaldatore per flusso di aria
PCT/IB2013/060500 WO2014083540A1 (en) 2012-11-30 2013-11-29 Hairflow heater

Publications (2)

Publication Number Publication Date
EP2926622A1 EP2926622A1 (de) 2015-10-07
EP2926622B1 true EP2926622B1 (de) 2019-09-04

Family

ID=47633366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13830093.4A Active EP2926622B1 (de) 2012-11-30 2013-11-29 Luftstromheizer

Country Status (6)

Country Link
EP (1) EP2926622B1 (de)
KR (1) KR102117615B1 (de)
CN (1) CN104995992B (de)
IT (1) ITRM20120607A1 (de)
RU (1) RU2663811C1 (de)
WO (1) WO2014083540A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1558268A (en) * 1975-07-05 1979-12-19 Schehr I Electrical heating element
DE3031373A1 (de) * 1980-08-20 1982-04-01 Braun Ag, 6000 Frankfurt Heizung fuer luftdurchsatzgeraete

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1615246B1 (de) 1967-08-18 1973-02-15 Eichenauer Fa Fritz Elektrisch betriebener Haartrockner kleiner Abmessung
GB2089626B (en) * 1980-12-11 1984-06-20 Standard Telephones Cables Ltd Electric resistance heating element
FR2838599B1 (fr) * 2002-04-11 2004-08-06 Valeo Climatisation Dispositif de chauffage electrique, notamment pour appareil de chauffage et ou climatisation de vehicule
DE202004019912U1 (de) * 2003-12-19 2005-03-10 Eichenauer Heizelemente Gmbh & Co. Kg Elektrischer Heizkörper für gasförmige Medien
DE102007003906A1 (de) * 2007-01-19 2008-07-24 Dbk David + Baader Gmbh Heizwendelanordnung zum Erwärmen vorbeiströmender Gasstoffe
AU2008219092A1 (en) * 2007-02-20 2008-08-28 Thermoceramix Inc. Gas heating apparatus and methods
RU76192U1 (ru) * 2007-12-10 2008-09-10 Общество с ограниченной ответственностью "ЭЛКАД" (ООО "ЭЛКАД") Электрический нагреватель-конвектор
KR20090076468A (ko) * 2008-01-09 2009-07-13 이용순 시간별 차등난방이 가능한 유류, 전기 겸용 보일러
IT1399252B1 (it) * 2010-04-02 2013-04-11 Irca Spa Riscaldatore d'aria elettrico, in particolare per elettrodomestici

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1558268A (en) * 1975-07-05 1979-12-19 Schehr I Electrical heating element
DE3031373A1 (de) * 1980-08-20 1982-04-01 Braun Ag, 6000 Frankfurt Heizung fuer luftdurchsatzgeraete

Also Published As

Publication number Publication date
CN104995992B (zh) 2019-06-04
WO2014083540A1 (en) 2014-06-05
KR102117615B1 (ko) 2020-06-03
KR20150113951A (ko) 2015-10-08
CN104995992A (zh) 2015-10-21
WO2014083540A8 (en) 2015-07-02
EP2926622A1 (de) 2015-10-07
ITRM20120607A1 (it) 2014-05-31
RU2663811C1 (ru) 2018-08-10
WO2014083540A9 (en) 2015-08-13

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