EP1884962A1 - Elektrischer Widerstand für ein Heizgerät - Google Patents

Elektrischer Widerstand für ein Heizgerät Download PDF

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Publication number
EP1884962A1
EP1884962A1 EP07103966A EP07103966A EP1884962A1 EP 1884962 A1 EP1884962 A1 EP 1884962A1 EP 07103966 A EP07103966 A EP 07103966A EP 07103966 A EP07103966 A EP 07103966A EP 1884962 A1 EP1884962 A1 EP 1884962A1
Authority
EP
European Patent Office
Prior art keywords
coils
electrical resistor
extension axis
along
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07103966A
Other languages
English (en)
French (fr)
Other versions
EP1884962B1 (de
Inventor
Pierpaolo Laveni
Renzo Re
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.)
Gamma SpA
Original Assignee
Gamma SpA
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Filing date
Publication date
Application filed by Gamma SpA filed Critical Gamma SpA
Publication of EP1884962A1 publication Critical patent/EP1884962A1/de
Application granted granted Critical
Publication of EP1884962B1 publication Critical patent/EP1884962B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • H01C3/08—Dimension or characteristic of resistive element changing gradually or in discrete steps from one terminal to another
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/38—Arrangement of the electric heating means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • H01C3/10—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration
    • 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
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands

Definitions

  • the present invention relates to an electrical resistor (also referred to as "heating element") to be used in hairdriers and similar equipment, the main function of which is to heat an air mass.
  • an electrical resistor also referred to as "heating element”
  • the number of waves per coil appears to be constant along the whole winding and/or also constant appears to be the number of waves for each coil sector.
  • this structure of known type of construction does not enable distribution of the thermal power transferred to the air on the body of the heating element (or resistor) to be controlled.
  • winding of the point with a smaller radius of curvature affects construction of the winding of the whole resistor, which on the sections having a greater radius of curvature, will give rise to a number of waves per turn smaller than the maximum possible one.
  • the present invention aims at conceiving an electrical resistor or heating element for air-heating apparatus that is able to overcome the performance limits discussed above.
  • the present invention also aims at making an electrical resistor offering the possibility of locally controlling the quality and amount of the heat-exchange processes between the resistance wire and the air impinging on it.
  • the electrical resistor according to the present invention substantially comprises at least one resistance wire 2 defining a predetermined number of coils 3 fitted along an extension axis 3a.
  • this resistance wire 2 is shaped according to at least one predetermined wave form (and can therefore comprise sinusoidal and/or zigzag and/or square wave undulations and more generally undulations of any form).
  • At least one insulating support 4 is present which is adapted to support coils 3 and extends along the extension axis 3a.
  • the wave form or forms visible on the resistance wire 2 define an undulation density D (i.e. a given number of undulations per unit length and/or width of angular arc) varying along the wire 2 itself.
  • D undulation density
  • the possibility of varying the undulation density involves the possibility of having a localised dispersion power of the thermal energy of greater or lesser degree; in this way therefore optimisation of the operating parameters of the electrical resistor is possible.
  • the variation modes of the undulation density D can be of any type depending on current requirements; for instance, the undulation density D can vary as a function of a linear coordinate along the extension axis 3a.
  • the undulation density D may also vary as a function of an angular coordinate around said extension axis 3a, or also as a function of the width of the angular arc and/or the radius of curvature of a coil 3 and/or an assembly of coils 3.
  • the undulation density D varies (following a "discrete" sequence of values) along coils or coil assemblies, on the extension axis 3a so that, for instance, a given coil 3 at a predetermined linear coordinate along the extension axis 3a has a constant undulation density D along the whole radial extension thereof.
  • the first coils i.e. those in the first section of axis 3a and which are impinged on by fresh air
  • the coils that are the closest to the end of axis 3a have a lower undulation density (because the air impinging on them has already been heated and therefore less heat supply is required).
  • the undulation density D it is possible for the undulation density D to decrease in coils 3 and/or coil assemblies 3 as they are in a more forward position along the extension axis 3a.
  • the undulation density D can increase in the coils 3 or coil 3 assemblies as they are in a more forward position along the extension axis 3a; for instance, this increase in the undulation density can take place in those resistors the diameter of which increases along axis 3a.
  • the undulation density D is variable also locally (i.e. on coil portions as well) at or close to bodies connected with resistor 1; these bodies (that typically in a air-heating device can be electric cables and/or elements for securing the electrical resistor 1 to a machine body and/or fastening elements of an electric motor) in fact constitute disturbance/flow resistance elements for the air flow and therefore the present invention advantageously enables the undulation density to be locally modified so as to avoid creation of overheating phenomena at said bodies.
  • the undulation density D can be locally varied also at other types of different electric/mechanical components inserted into the body of the heating apparatus, such as ionising devices, thermostats and others.
  • the resistance wire 2 can have undulations of different geometric conformations; in particular, apart from the shape of these undulations, variation in the geometric conformations can take place depending on a linear coordinate along the extension axis 3a and/or as a function of a radial coordinate around the extension axis 3a and/or as a function of the width of the angular arc and/or the radius of curvature of a coil.
  • the coaxial condition (or in other words, the condition of coincidence of the axes of the heating bodies) is not essential; depending on current requirements, it is therefore possible to make an electrical resistor in which the resistance wire or wires form at least two heating bodies (that can be of cylindrical shape or of any other shape) fitted into each other.
  • heating resistors of the "coaxial" type are wished to be made (or in any case resistors in which two or more heating bodies fitted within each other are defined, which however have misaligned and/or parallel axes) it is therefore suitable for support 4 to be shaped in such a manner that the "heating bodies" formed by the different coil series can be positioned and carried thereon.
  • support 4 can therefore comprise two (or more) under-supports 4a and 4b, each of which carries a series of coils 3.
  • one series of coils (preferably the innermost one) can be advantageously provided to act as under-support for the other series of coils and/or for the support of the last-mentioned series; in this manner an important reduction in costs and in the construction complexity of the finished product can be achieved.
  • the method of the invention contemplates a step of varying the undulation density D (that is preferably implemented as a function of a linear coordinate along the extension axis 3a and/or as a function of a radial coordinate around the extension axis 3a and/or as a function of the width of the angular arc and/or the radius of curvature of a coil).
  • this step of varying the undulation density D is carried out through variation of a winding tension; in fact, through variation of the winding tension it is possible to modify the undulations making them longer or shorter; in this way, more or less undulations can be obtained in a given section of wire, the length of the processed wire being the same.
  • the method involves changing of the number of waves upon changing of the radius of curvature, or more generally it will be recognised that the number of waves can vary along the winding coils.
  • the present invention relates to an electrical resistor for hairdriers and similar apparatus with a wave-shaped resistance wire (that depending on the method of shaping the resistance wire can also take equivalent names such as zigzag-wire resistor, sinusoidal or undulated-wire resistor, resistor having the shape of a Greek fret or particular geometric shapes, etc.) and which is made from one or more wires wound up into coils aligned on an insulating support; this electrical resistor is of such a nature that the number of waves per coil is not constant along the whole winding and/or is not constant in the sectors of the same coil.
  • the invention enables achievement of important advantages.
  • the new and original structural architecture of the electrical resistor (obtained through application of variations in the number of waves per turn and/or sector, during construction) enables an almost full control of the spatial re-distribution of the thermal power transferred to the air, thus ensuring benefits in terms of construction, performance and yield.
  • the electric power supplied to the resistor can be increased by introducing a greater number of waves (or, in other words, by increasing the undulation density) where the geometric conditions allow it.
  • a construction benefit is also achieved because a greater structural sturdiness of the winding is ensured, which is obtained by varying the wave number (and consequently the winding tension) in a localised manner, based on the requirements dictated by the elasticity of the shaped resistance wire.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Resistance Heating (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Surface Heating Bodies (AREA)
  • Cosmetics (AREA)
EP07103966A 2006-08-04 2007-03-12 Elektrischer Widerstand für ein Heizgerät und Verfahren zu seiner Herstellung Active EP1884962B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000034A ITPC20060034A1 (it) 2006-08-04 2006-08-04 Nuova resistenza elettrica con ridistribuzione spaziale della potenza per asciugacapelli e apparecchi simili

Publications (2)

Publication Number Publication Date
EP1884962A1 true EP1884962A1 (de) 2008-02-06
EP1884962B1 EP1884962B1 (de) 2010-04-28

Family

ID=38330136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07103966A Active EP1884962B1 (de) 2006-08-04 2007-03-12 Elektrischer Widerstand für ein Heizgerät und Verfahren zu seiner Herstellung

Country Status (4)

Country Link
EP (1) EP1884962B1 (de)
AT (1) ATE466368T1 (de)
DE (1) DE602007006111D1 (de)
IT (1) ITPC20060034A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018141567A1 (de) * 2017-02-02 2018-08-09 Vishay Electronic Gmbh Unduliert leistungswiderstand
EP3424363A1 (de) * 2017-07-06 2019-01-09 Action Technology Indústria E Comércio De Eletroeletrônicos Ltda Widerstandselement für heizvorrichtungen
CN112425258A (zh) * 2018-07-18 2021-02-26 伽玛股份公司 用于吹风机的空气加热装置、用于吹风机的吹风装置、以及包括所述装置的吹风机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038414A1 (de) * 1980-04-18 1981-10-28 Braun Aktiengesellschaft Elektrisches Drahtheizelement
EP0293997A1 (de) * 1987-06-04 1988-12-07 GAMMA S.p.A. Elektrische Widerstände, aufgebaut aus gewelltem Widerstandsdraht, für Axialströmungsgebläse
EP1418794A1 (de) * 2002-11-09 2004-05-12 Eichenauer Heizelemente GmbH & Co.KG Heizkörper für gasförmige Medien

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038414A1 (de) * 1980-04-18 1981-10-28 Braun Aktiengesellschaft Elektrisches Drahtheizelement
EP0293997A1 (de) * 1987-06-04 1988-12-07 GAMMA S.p.A. Elektrische Widerstände, aufgebaut aus gewelltem Widerstandsdraht, für Axialströmungsgebläse
EP1418794A1 (de) * 2002-11-09 2004-05-12 Eichenauer Heizelemente GmbH & Co.KG Heizkörper für gasförmige Medien

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018141567A1 (de) * 2017-02-02 2018-08-09 Vishay Electronic Gmbh Unduliert leistungswiderstand
EP3424363A1 (de) * 2017-07-06 2019-01-09 Action Technology Indústria E Comércio De Eletroeletrônicos Ltda Widerstandselement für heizvorrichtungen
CN112425258A (zh) * 2018-07-18 2021-02-26 伽玛股份公司 用于吹风机的空气加热装置、用于吹风机的吹风装置、以及包括所述装置的吹风机
JP2021531150A (ja) * 2018-07-18 2021-11-18 ガンマ ソチエタ ペル アツィオニGamma S.P.A. ヘアドライヤ用の空気加熱装置、ヘアドライヤ用のブロー装置、および前記装置を含むヘアドライヤ
CN112425258B (zh) * 2018-07-18 2022-08-02 伽玛股份公司 用于吹风机的空气加热装置、用于吹风机的吹风装置、以及包括所述装置的吹风机

Also Published As

Publication number Publication date
EP1884962B1 (de) 2010-04-28
ITPC20060034A1 (it) 2008-02-05
DE602007006111D1 (de) 2010-06-10
ATE466368T1 (de) 2010-05-15

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