WO2015052737A1 - Procédé de fabrication de résistance électrique coaxiale et résistance électrique coaxiale - Google Patents

Procédé de fabrication de résistance électrique coaxiale et résistance électrique coaxiale Download PDF

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Publication number
WO2015052737A1
WO2015052737A1 PCT/IT2013/000282 IT2013000282W WO2015052737A1 WO 2015052737 A1 WO2015052737 A1 WO 2015052737A1 IT 2013000282 W IT2013000282 W IT 2013000282W WO 2015052737 A1 WO2015052737 A1 WO 2015052737A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
electric resistance
blades
coaxial electric
insulating body
Prior art date
Application number
PCT/IT2013/000282
Other languages
English (en)
Inventor
Renzo Re
Pierpaolo Laveni
Daniele FERRI
Original Assignee
Gamma S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gamma S.P.A. filed Critical Gamma S.P.A.
Priority to PCT/IT2013/000282 priority Critical patent/WO2015052737A1/fr
Priority to ARP140103768A priority patent/AR097979A1/es
Publication of WO2015052737A1 publication Critical patent/WO2015052737A1/fr

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1863—Arrangement or mounting of electric heating means
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0423—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between hand-held air guns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0052—Details for air heaters
    • F24H9/0057—Guiding means
    • F24H9/0063—Guiding means in air channels
    • 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
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the present invention has as its subject a method of manufacturing a coaxial electric resistance.
  • the present invention also has as its subject a coaxial electric resistance.
  • the coaxial electric resistance according to the present invention is usable for heating airflows for example in hairdryers, hand dryers, paint strippers or other similar devices.
  • the term 'coaxial electric resistance' is used to mean an electric resistance in which the resistive wire (or the resistive wires) form two heating windings, the one arranged inside the other.
  • coaxial indicates that the axes of the two heating windings coincide, even though resistances can be made with axes slightly offset or inclined with respect to each other.
  • a known example of coaxial electric resistance is described and illustrated in Italian patent IT1289406.
  • a plurality of blades mutually intersect at a central axis and at the same time form a support for an inner winding and a support for an outer winding formed from a resistive wire shaped according to at least one predetermined waveform.
  • an insulating sleeve is provided, machined so as to have a plurality of axial slots, each adapted to receive a blade. The insulating sleeve thus prepared is inserted axially between the two windings already wound onto the blades.
  • the insulating sleeve makes it possible to reduce the distance between the two windings and therefore the overall radial dimension of the resistance, thus avoiding the possibility of an electric arc being formed between the windings themselves. Furthermore, both the presence of the insulating sleeve and the limited distance between the windings means that there are limited flows of cold air.
  • This insertion stage must be performed manually, interrupting automatic production of the resistance, and under constant ohmic monitoring to check that there is no risk of short circuit between the two windings.
  • the insulating sleeve inevitably has a continuous portion, i.e. containing no slots, which in the assembled configuration of the resistance extends externally to the windings in an axial direction, increasing the axial dimensions of the resistance itself.
  • the technical task at the base of the present invention is to provide a method of manufacturing a coaxial electric resistance and a coaxial electric resistance which overcome at least one of the aforementioned disadvantages of the known art.
  • a further object of the present invention is to propose a method of manufacturing a coaxial electric resistance which eliminates the steps which require excessive attention and manual input or which require the application of constant checks or which constitute a risk of wastage through breakages or incorrect alignments.
  • Yet another object of the present invention is to propose a coaxial resistance of modest dimensions which is versatile from the viewpoint of the independent configuration of the two windings and of the relative waveforms.
  • figure 1 is a schematic perspective view of a first stage of the method according to the present invention
  • figure 2 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • figure 3 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • FIG. 4 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • figure 5 is a schematic side view of figure 4.
  • figure 6 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • figure 7 is a schematic side view of figure 6;
  • figure 8 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • figure 9 is a schematic side view of figure 8.
  • figure 10 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • figure 11 is a schematic perspective view of a subsequent stage of the method according to the present invention.
  • figure 12 is a schematic perspective view of a subsequent stage of the method according to the present invention corresponding to a schematic perspective view of a possible embodiment of a coaxial electric resistance according to the present invention
  • figure 13 is a schematic front view of figure 12;
  • figure 14 is a schematic perspective view of a possible embodiment of a coaxial electric resistance according to the present invention.
  • figure 15 is a schematic side view of figure 14;
  • figure 16 is a schematic front view of figure 14. Detailed description of preferred embodiments of the invention
  • no. 1 comprehensively indicates a coaxial electric resistance.
  • a first insulating support 2 comprises a predetermined number of first blades 3 extending on planes mutually intersecting at a central axis 4.
  • the first blades 3 are preferably made of electrically insulating and heat-resistant material, for example mica or other anti-static material.
  • a first blade 3 comprises a slot 5 arranged along the central axis 4 and debouching at the outside of the first blade at an end portion 6 of the first blade itself.
  • No. 7 indicates two teeth having the function of stops as will be described later.
  • each first blade 3 comprises a series of housings 8 distributed along the central axis 4 on opposite sides of each first blade, whose functions will be described in detail in what follows.
  • the first insulating support 2 comprises two first blades intersecting each other at the central axis 4 and arranged at 90° to each other.
  • the end portions 6 of the two first blades 3 are respectively opposed so that the two slots mutually face each other.
  • the first insulating support 2 comprises a waiting axial portion 2a and an operative axial portion 2b whose functions will be described in detail in what follows.
  • the waiting axial portion 2a can also be absent and the insulating support 2 can comprise solely the operative axial portion 2b (figures 14 and 15).
  • Figures 1 and 2 illustrate furthermore two stages of a method of manufacturing a coaxial electric resistance the first insulating support 2 is envisaged as being prepared as described above.
  • the coaxial electric resistance 1 comprises a first winding 9.
  • This first winding is made up of a plurality of first turns 10 of resistive wire 11 wound round the first insulating support 2.
  • the resistive wire 11 is shaped according to at least one predetermined waveform which can comprise sinusoidal and/or zig-zag and/or square-wave and/or spiral and, more generally, any form of undulations.
  • Each first turn 10 is housed in one of the housings 8, for example at a peak of one of the waves. Between a first blade and the next a constant or variable number of waves can be provided.
  • Figure 6 corresponds also to a stage of the method of manufacturing a coaxial electric resistance wherein the resistive wire 11 is envisaged as being prepared and wound round the first insulating support 2, making it advance along the central axis, for example along a first direction of advancement X, and forming a predetermined number of first turns 10, so that the set of first turns 10 forms the first winding 9 of the coaxial electric resistance.
  • the first insulating support 2 has a length I (figure 7), measured along the major central axis 4, greater than a first length L1 of the first winding 9.
  • the first winding 9 is wound radially outside the operative axial portion 2b of the first insulating support 2, having therefore a length at least equal to L1 .
  • No. 12 indicates a hollow insulating body comprising a lateral wall 12a arranged radially outside the first winding 9.
  • the hollow insulating body 12 is preferably made of electrically insulating and heat-resistant material, for example mica or other anti-static material.
  • Figures 3-9 illustrate more clearly the characteristics of the hollow insulating body 12 whose lateral wall 12a delimits a cavity 14 open at opposite ends with respect to a longitudinal direction A of the hollow insulating body itself. It should be noted that in figures 3-9, in particular in figure 3, the longitudinal direction A coincides with the central axis 4 since these drawings illustrate some stages of the method according to the present invention wherein the hollow insulating body 12 is envisaged as being arranged as previously described and fitted longitudinally and coaxially over the first winding so that the lateral wall 12a is arranged radially outside the first winding 9.
  • figures 3-9 correspond to a first possible embodiment of the method according to the present invention wherein the following is envisaged:
  • the first insulating support 2 comprises the waiting axial portion 2a and the operative axial portion 2b),
  • figures 3-9 correspond to a first possible embodiment of the method according to the present invention wherein the following is envisaged:
  • figures 3-9 correspond to a possible embodiment of the method according to the present invention wherein the following is envisaged:
  • no. 13 indicates a second insulating support.
  • the second support 13, more clearly illustrated in figures 10 and 11, comprises a predetermined number of second blades 14.
  • the second blades 14 extend on planes mutually intersecting at the central axis 4. Unlike the first blades 3, the second blades 14 do not intersect each other at the central axis 4 since the second blades 14 are arranged in a position radially outside the hollow insulating body 12.
  • the second blades 14 are preferably made of electrically insulating and heat- resistant material, for example mica or other anti-static material.
  • each second blade 14 comprises two axial stops 15 configured for receiving the hollow insulating body 12.
  • the two axial stops contain the hollow insulating body 12 along the central axis 4 and keep it in position with respect to the first winding 9.
  • every second blade 14 comprises a housing 16 configured for receiving the teeth 7 which have the function of stops for the first blades 3 in cases where a first blade lies in the same plane as a second blade.
  • the second blades 14 are externally adjacent to the hollow insulating body 12, embracing the first blades 3 in a radial and axial direction with respect to the central axis.
  • each second blade 14 has a "C" shaped conformation, with an axial portion 14a arranged parallel to the central axis 4 and two radial portions 14b arranged end to end with respect to the axial portion and on opposite sides of the central axis 4.
  • each second blade 14 comprises a series of housings 13a distributed along the central axis 4 on opposite sides of each second blade, whose functions will be described in detail in what follows.
  • At least one of the second blades 14 can be externally adjacent to the hollow insulating body 12 parallel to one of the first blades 3.
  • the second insulating support 13 comprises at least two second blades 14 extending on planes mutually intersecting at the central axis 4.
  • the second blades 14 are uniformly distributed around the hollow insulating body 12.
  • the number of the second blades 14 can vary from two to twenty, but embodiments with an even greater number of second blades are not excluded.
  • the second insulating support 13 correspond to a possible embodiment of the method according to the present invention wherein the second insulating support 13 is envisaged as being prepared as previously described.
  • the hollow insulating body 12 should be radially arranged with respect to the central axis 4 externally adjacent to the hollow insulating body 12, and kept in position. At the stage of bringing them adjacent to the hollow insulating body 12, the hollow insulating body 12 is arranged between the two axial stops 15 of the second blades 14.
  • the second blades 14 are brought externally adjacent to the hollow insulating body, embracing the first blades 3 in a radial and axial direction with respect to the central axis 4.
  • At least one of the second blades 14 is brought externally adjacent to the hollow insulating body 12 parallel to one of the first blades 3.
  • no. 17 indicates a second winding made up of a plurality of second turns 18 of the resistive wire 11 wound round the second insulating support 13.
  • Each first turn 18 is housed in one of the housings 13a, for example at a peak of one of the waves. Between one second blade and the next there can be provided a constant or variable number of waves.
  • the resistive wire 1 1 (or different resistive wires) form two heating bodies, one wedged inside the other, consisting respectively of the first and second windings.
  • Figure 12 corresponds also to a stage of the method according to the present invention wherein the resistive wire 1 1 is envisaged as being wound around the second insulating support 13 making it advance along the central axis 4, according to a second direction of advancement Y, which may be the same as X or different, and forming a predetermined number of second turns 18.
  • the directions of advancement X and Y can be the same in the event that the windings, inner and outer, are not made with a single wire but with two separate wires, therefore with a break in continuity.
  • the set of second turns 18 forms the second winding 17 of the coaxial electric resistance, having a second length L2 measured along the central axis 4.
  • the hollow insulating body 12 is fitted longitudinally and coaxially onto the first winding 2 subsequently to the formation of the first winding 9 and prior to the formation of the second winding 17.
  • the winding of the resistive wire 1 1 around the second insulating support 13 locks the second blades 14 with respect to the hollow insulating body 12.
  • the hollow insulating body 12 has a length L (figure 7) measured along its longitudinal direction A (or along the central axis 4 in the assembled configuration of the coaxial electric resistance) such as to mutually insulate the first winding 9 and the second winding 17, so that the lateral wall 12a of the hollow insulating body 12 forms a continuous wall separating the first and second windings.
  • the length L of the hollow insulating body 12 is preferably greater than or equal to the lesser of the first length L1 and the second length L2 respectively of the first and second windings.
  • This length L can even be slightly less than the lesser of the two lengths L1 and L2, but only if this does not prejudice its function as insulation.
  • the second winding 13 is envisaged as being formed with a second length L2 (figure 12) greater than the first length L1 of the first winding 9.
  • Figures 14-16 illustrate a possible embodiment of a coaxial electric resistance wherein the components analogous to those described in the embodiment of figures 12 and 13 are indicated with the same reference number.
  • the second winding 17 is envisaged as being formed with a second length L2 substantially equal to the first length L1 of the first winding 9.
  • the method of manufacturing the coaxial electric resistance comprises the stages previously described with the peculiarity that the hollow insulating body 12 is fitted longitudinally and coaxially onto the first winding 9 while it is fitted onto the first insulating support 2 since, as mentioned above, in this case the insulating support 2 lacks the waiting axial portion 2a.
  • the stage at which the hollow insulating body 12 is fitted longitudinally and coaxially onto the first insulating support 2 is subsequent to the stage of forming the first winding 9.
  • the method and the coaxial resistance according to the invention make it possible to significantly limit the axial and radial dimensions of the resistance itself, to reduce the number of blades and to deconstrain the number of waves of the first winding with respect to the number of blades in the second insulating support.
  • the height of the wave of the first winding is independent of the geometry of the second blades and the positioning of the second blades is facilitated.
  • the relationship between the first and the second blades can be arbitrary.
  • the method is semi-automated and can be performed on a single machine even with reference to the stage of fitting the hollow insulating body.
  • a hollow insulating body having a continuous lateral wall i.e. without axial slots, makes it possible to choose the preferred dimensions of the insulating body itself, to eliminate waste due to breakages and to limit the overall axial dimension of the electrical resistance.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

Cette invention concerne un procédé de fabrication d'une résistance électrique coaxiale (1), comprenant les étapes consistant à : préparer un premier support isolant (2) comprenant un nombre prédéterminé de premières lames (3) et enrouler un fil résistif (11) autour du premier support isolant (2) de manière à former un premier enroulement (9). Un corps isolant creux (12) est adapté sur le premier enroulement (9) dans une position orientée vers l'extérieur dans un sens radial par rapport au premier enroulement (9). Un second support isolant (13) comprenant un nombre prédéterminé de secondes lames (14) est agencé dans une position orientée vers l'extérieur dans un sens radial par rapport au corps isolant creux (12). Ledit fil résistif (11) est enroulé autour du second support isolant (13) de manière à former un second enroulement (17).
PCT/IT2013/000282 2013-10-11 2013-10-11 Procédé de fabrication de résistance électrique coaxiale et résistance électrique coaxiale WO2015052737A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IT2013/000282 WO2015052737A1 (fr) 2013-10-11 2013-10-11 Procédé de fabrication de résistance électrique coaxiale et résistance électrique coaxiale
ARP140103768A AR097979A1 (es) 2013-10-11 2014-10-09 Método para elaborar una resistencia eléctrica coaxial y resistencia eléctrica coaxial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2013/000282 WO2015052737A1 (fr) 2013-10-11 2013-10-11 Procédé de fabrication de résistance électrique coaxiale et résistance électrique coaxiale

Publications (1)

Publication Number Publication Date
WO2015052737A1 true WO2015052737A1 (fr) 2015-04-16

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Country Status (2)

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AR (1) AR097979A1 (fr)
WO (1) WO2015052737A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3021707A1 (fr) * 2013-07-16 2016-05-25 Dyson Technology Limited Résistance pour un appareil à main
EP3373699A1 (fr) * 2017-03-09 2018-09-12 Koninklijke Philips N.V. Procédé de fabrication d'un appareil de chauffage et appareil de chauffage
CN108800560A (zh) * 2018-07-19 2018-11-13 浙江普莱得电器有限公司 一种多功能的热风枪
CN109480447A (zh) * 2019-01-04 2019-03-19 深圳市奋达科技股份有限公司 一种风筒发热架及风筒发热架的装配方法
CN109511179A (zh) * 2018-12-05 2019-03-22 太原航空仪表有限公司 一种低流阻自绝缘空气管路加热装置
EP3553411A1 (fr) * 2018-04-09 2019-10-16 Zhejiang Prulde Electric Appliance Co., Ltd. Noyau de chauffage pour pistolet à air chaud et pistolet à air chaud
CN111426058A (zh) * 2020-03-31 2020-07-17 中国空气动力研究与发展中心超高速空气动力研究所 一种高超声速飞行器热环境模拟用电弧加热器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416688A (en) * 1921-09-12 1922-05-23 Samuel M Carmean Electric heater
US20040001707A1 (en) * 2002-06-29 2004-01-01 Jae-Young Ryu Hair drier having a pad for generating far-infrared rays and anions and method for making the pad
US6732450B1 (en) * 2003-07-11 2004-05-11 Shu-Lien Chen Electrothermal rack of hair dryer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416688A (en) * 1921-09-12 1922-05-23 Samuel M Carmean Electric heater
US20040001707A1 (en) * 2002-06-29 2004-01-01 Jae-Young Ryu Hair drier having a pad for generating far-infrared rays and anions and method for making the pad
US6732450B1 (en) * 2003-07-11 2004-05-11 Shu-Lien Chen Electrothermal rack of hair dryer

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3021707A1 (fr) * 2013-07-16 2016-05-25 Dyson Technology Limited Résistance pour un appareil à main
EP3373699A1 (fr) * 2017-03-09 2018-09-12 Koninklijke Philips N.V. Procédé de fabrication d'un appareil de chauffage et appareil de chauffage
EP3553411A1 (fr) * 2018-04-09 2019-10-16 Zhejiang Prulde Electric Appliance Co., Ltd. Noyau de chauffage pour pistolet à air chaud et pistolet à air chaud
CN108800560A (zh) * 2018-07-19 2018-11-13 浙江普莱得电器有限公司 一种多功能的热风枪
CN109511179A (zh) * 2018-12-05 2019-03-22 太原航空仪表有限公司 一种低流阻自绝缘空气管路加热装置
CN109480447A (zh) * 2019-01-04 2019-03-19 深圳市奋达科技股份有限公司 一种风筒发热架及风筒发热架的装配方法
CN109480447B (zh) * 2019-01-04 2024-04-02 深圳市奋达科技股份有限公司 一种风筒发热架及风筒发热架的装配方法
CN111426058A (zh) * 2020-03-31 2020-07-17 中国空气动力研究与发展中心超高速空气动力研究所 一种高超声速飞行器热环境模拟用电弧加热器

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