EP3203162B1 - Structure de chauffage pour distributeurs d'air chaud - Google Patents

Structure de chauffage pour distributeurs d'air chaud Download PDF

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Publication number
EP3203162B1
EP3203162B1 EP17153677.4A EP17153677A EP3203162B1 EP 3203162 B1 EP3203162 B1 EP 3203162B1 EP 17153677 A EP17153677 A EP 17153677A EP 3203162 B1 EP3203162 B1 EP 3203162B1
Authority
EP
European Patent Office
Prior art keywords
tubular
flow
tubular element
air
distributor
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
EP17153677.4A
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German (de)
English (en)
Other versions
EP3203162A1 (fr
Inventor
Costante Dall'anese
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.)
HT SpA
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HT SpA
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Publication date
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Publication of EP3203162A1 publication Critical patent/EP3203162A1/fr
Application granted granted Critical
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Classifications

    • 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
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/46—Heating elements having the shape of rods or tubes 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
    • 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 generally relates to a heating structure for hot air distributors.
  • the invention relates to a heating structure for hot air distributors, in which a resistor is traversed by an air flow and at least one conductor element, which is coupled with a support element made of a stable thermally material, converts electrical energy into heat.
  • heating elements are normally used for hot air distributors, such as, for example, air heaters for environments, hair dryer, etc.
  • Said heating elements which are traversed by a flow of air or other fluid which is supplied in output, are generally made of ceramic material or another heat resistant material and are inserted inside a tubular element, in which, from one end, air is blown.
  • the heating element is connected to a source of electric supply, through a support element which is usually placed at the air inlet.
  • a further protective disk made of ceramic which contains the channels within which flows the outgoing hot air, is also placed.
  • the heating elements are normally constituted by spiral-shaped electrical conductors, which are insulated and fixed to the support element.
  • the above electrical conductors may be positioned within the channels of the support element, which extend from the air inlet up to the air outlet, or can be fitted on an external liner of the support element.
  • Heating structures for hot air distributors having the technical features of the preamble of appended claim 1 are known, for example, from US3109912A , EP2690374A1 and US3593498A .
  • the present invention is related to an improved heating structure for hot air distributors, which has a greater reliability of the heating elements, a better heat transfer to the output and, consequently, a greater efficiency, with respect to the prior art.
  • Another object of the invention is to provide a heating structure for hot air distributors, which is able to obtain a significant and almost immediate thermal exchange of the incoming air flow, also decreasing the overall dimensions of the structure and saving time and/or fluid.
  • a further object of the invention is to provide a heating structure for hot air distributors, which is particularly effective, reliable, convenient and cheap, with respect to the prior art, and which can be used for any new or already existing hot air distributor device.
  • the structure according to the invention allows to quickly heat the air flowing at the input and instantly to get a homogeneous and controlled temperature of the air at the output, by employing a winding circuit which constitutes a heat exchanger inside a total heat exchange circuit.
  • the heating structure is provided with at least one coaxial resistor contained within respective tubular elements, which are placed at a distance from one another in the radial direction and which define relative coaxial channels in which the air to be heated flows; several tubular elements with walls having a minimum thickness or at least two tubular elements having more thick walls can be used.
  • Said tubular elements define coaxial air channels and act as supporting elements of the electrical resistors; moreover, internal and external surfaces of said tubular elements have a conductive ceramic layer which behaves as a heat conductor.
  • channels Due to their large surface, said channels have a relevant air flow. Furthermore, the inner and outer surfaces of the channels allow a significant heat exchange before the air flow is sent out.
  • the particular structure of the invention allows to simplify the entire manufacturing process and, in particular, allows to reduce time and costs production.
  • the fast and uniform heat which is transferred to the air flow through a wide exchange surface decreases the danger of overheating the electrical conductor and, on the other hand, has a positive effect on the output air flow, since the mechanical stresses on the hot air delivery system are minimized.
  • the heating structure according to the invention is particularly used for hot air distributors with an output having a cylindrical section where the heating resistors are placed, with an air blower at the input and a portion in which a drive motor of the blower and a control unit for operating the resistors are housed.
  • the heating structure of the present invention has a tubular element 10, which is inserted inside a casing 11 of the hot air distributor and, in particular, which is engaged in correspondence with a tapered end 12 of the distributor from which the flow of hot air 7 comes out.
  • At least one resistor 13 is placed inside the tubular element 10 and said resistor 13 has essentially a tubular shape and is attached to a thermally conductive layer 14; both the tubular element 10 and the conductive layer 14 are made of ceramic material and, in particular, the element 10 has an outer casing 15 and a central body 16 made of electrically conductive ceramic material, to which the electrodes 17, 18 are connected for providing an electrical voltage in order to have electric current in the resistor 13.
  • the inlet air flows (arrow F) from the inlet opening 1 and is spread inside the distributor.
  • a transverse barrier device 2 then directs the inlet air flow F in a primary flow F1, which is inserted in a cavity 3 comprised between the housing 11 of the distributor and a further inner tubular wall 19 placed between the housing 11 of the distributor and the outer casing 15 of the tubular element 10.
  • Said inner tubular wall 19 has, towards the tapered end 12 of the distributor, one or more through holes 4, which direct the air flow inside the cavity 5 provided between the inner tubular wall 19 and the casing 15 of the tubular element 10.
  • Said air flow F2 is then directed back towards the base of the tubular element 10 and then conveyed again toward the end 12 (flow F3), so as to completely envelope the resistor 13.
  • the particular air flow (which follows a winding path, with a forward flow F1, a return flow F2 and a further forward flow F3, which passes through the resistor 13 until the output of the hot air distributor) causes the heating of the inlet air flow F in a more efficient way and more quickly with respect to the prior art.

Landscapes

  • 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)
  • Resistance Heating (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)

Claims (2)

  1. Structure chauffante pour distributeurs d'air chaud, comprenant un élément tubulaire (10) inséré à l'intérieur d'un boîtier (11) d'un distributeur d'air chaud, dans lequel ledit élément tubulaire (10) est engagé en correspondance avec une extrémité amincie (12) dudit distributeur depuis lequel un flux d'air chaud (7) sort et ledit élément tubulaire (10) inclut au moins une résistance tubulaire (13) fixée à une couche thermiquement conductrice (14), tandis que, à une extrémité opposée à ladite extrémité de sortie amincie (12), une ouverture d'entrée (1) est prévue où un flux d'air d'alimentation (F) circule, dans laquelle ledit flux d'air d'alimentation (F) est dirigé au moyen d'une barrière transverse (2), en un premier flux d'air (F1) circulant à l'intérieur d'une première cavité (3) comprise entre ledit boîtier (11) du distributeur et une paroi tubulaire intérieure (19) placée entre ledit boîtier (11) du distributeur et un boîtier extérieur (15) dudit élément tubulaire (10), dans laquelle ladite paroi tubulaire intérieure (19) présente, en direction de ladite extrémité amincie (12) du distributeur, un ou plusieurs trous ou ouvertures traversants (4), qui envoient ledit premier flux d'air (F1) à l'intérieur de ladite première cavité (3) vers un second flux (F2) circulant à l'intérieur d'une seconde cavité (5) placée entre ladite paroi tubulaire intérieure (19) et ledit boîtier extérieur (15) dudit élément tubulaire (10), ledit second flux d'air (F2) à l'intérieur de ladite seconde cavité (5) étant envoyé à nouveau vers une base dudit élément tubulaire (10) et ensuite transmis à nouveau via un troisième flux (F3) vers ladite extrémité amincie (12), de manière à envelopper complètement ladite résistance tubulaire (13) et de sorte que ledit air d'alimentation (F), en circulant à travers ladite résistance tubulaire (13), est chauffé constamment,
    caractérisée en ce que ledit élément tubulaire (10) présente un boîtier extérieur (15) et un corps central (16), constitué de matériau céramique électriquement conducteur et entouré par ladite résistance tubulaire (13) et par ledit boîtier extérieur (15), et une pluralité d'électrodes (17, 18) pour appliquer une tension électrique et un courant électrique au niveau desdites résistances tubulaires (13) sont reliées audit boîtier extérieur (15) et audit corps central (16).
  2. Structure chauffante selon la revendication 1, caractérisée en ce que ledit élément tubulaire (10) et ladite couche thermiquement conductrice (14) sont constitués de matériau céramique.
EP17153677.4A 2016-02-03 2017-01-30 Structure de chauffage pour distributeurs d'air chaud Active EP3203162B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2016A000200A ITUB20160200A1 (it) 2016-02-03 2016-02-03 Struttura riscaldante per erogatori di aria calda

Publications (2)

Publication Number Publication Date
EP3203162A1 EP3203162A1 (fr) 2017-08-09
EP3203162B1 true EP3203162B1 (fr) 2020-04-08

Family

ID=55969226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17153677.4A Active EP3203162B1 (fr) 2016-02-03 2017-01-30 Structure de chauffage pour distributeurs d'air chaud

Country Status (2)

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EP (1) EP3203162B1 (fr)
IT (1) ITUB20160200A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018109643A1 (de) * 2018-04-23 2019-10-24 Eisenmann Se Vorrichtung und Verfahren zum Erhitzen von Gas für einen Hochtemperaturofen
DE102018133362A1 (de) * 2018-12-21 2020-06-25 Eisenmann Se Injektionseinrichtung zum Abgeben eines Gases, Prozessgassystem zum Zuführen eines Prozessgases, sowie Vorrichtung und Verfahren zum thermischen oder thermo-chemischen Behandeln von Material
CN110173888A (zh) * 2019-05-10 2019-08-27 佛山建邦机械有限公司 一种套管式空气电加热器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109912A (en) * 1961-12-21 1963-11-05 Ralph G Cerulli Electric heater for heating compressed air
US3593498A (en) * 1969-01-21 1971-07-20 Albert L Semon Air drier and filter
EP2690374B1 (fr) * 2012-07-25 2017-01-04 HT S.p.A. Structure résistive pour le chauffage uniforme de fluides

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3203162A1 (fr) 2017-08-09
ITUB20160200A1 (it) 2017-08-03

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