EP1731852A1 - Réchauffeur électrique pour système de ventilation d'automobile - Google Patents

Réchauffeur électrique pour système de ventilation d'automobile Download PDF

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Publication number
EP1731852A1
EP1731852A1 EP05425415A EP05425415A EP1731852A1 EP 1731852 A1 EP1731852 A1 EP 1731852A1 EP 05425415 A EP05425415 A EP 05425415A EP 05425415 A EP05425415 A EP 05425415A EP 1731852 A1 EP1731852 A1 EP 1731852A1
Authority
EP
European Patent Office
Prior art keywords
radiators
electric heater
longitudinal
stack
longitudinal beams
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
EP05425415A
Other languages
German (de)
English (en)
Other versions
EP1731852B1 (fr
Inventor
Duilio Fusaro
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.)
CEBI SpA
Original Assignee
CEBI SpA
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 CEBI SpA filed Critical CEBI SpA
Priority to DE200560009157 priority Critical patent/DE602005009157D1/de
Priority to EP20050425415 priority patent/EP1731852B1/fr
Publication of EP1731852A1 publication Critical patent/EP1731852A1/fr
Application granted granted Critical
Publication of EP1731852B1 publication Critical patent/EP1731852B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status 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
    • F24H3/0429—For vehicles
    • 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
    • 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
    • F24H3/0429—For vehicles
    • F24H3/0435—Structures comprising heat spreading elements in the form of fins
    • 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
    • F24H3/0429—For vehicles
    • F24H3/0441—Interfaces between the electrodes of a resistive heating element and the power supply means
    • F24H3/0447—Forms of the electrode terminals, e.g. tongues or clips
    • 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
    • F24H3/0429—For vehicles
    • F24H3/0452—Frame constructions
    • F24H3/047—Multiple-piece frames assembled on their four or more edges
    • 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
    • F24H9/1872—PTC

Definitions

  • This invention relates to an electric heater for automobile ventilation systems.
  • Car passenger compartments have been traditionally heated by heat exchangers placed in the air path of the compartment ventilation system and connected in the hydraulic circuit of the cooling system of the vehicle engine. More recently, in order to have an immediately effective heating also at initial start of the car, heat exchangers are supplemented more and more with electric heaters, generally using
  • PTC resistors also called thermistors
  • These electric heaters are installed in the air conduit within the ventilation cabinet to be traversed by the ventilation airflow, and they are usually turned on for transient periods.
  • European Patent Application No. 04425157.7 discloses an electric heater of the above type, in which PTC pellets are clamped between stacked radiators consisting of aluminum bars fretted with comb fins, which also lead the electric current to the PTC pellets and are in thermal and electric contact therewith.
  • Steel slats are arranged between the mutually facing combs of the the inner radiators, and operate as leaf springs acting to bias the radiators against each other in a crosswise direction for a good contact with the sandwiched PTC pellets.
  • a pair of brackets attached to the opposite ends of the stack maintain the inner radiators, as well as the PTC pellets and the steel slats, sandwiched between the outermost radiators.
  • the outermost radiators have a rigid profile with closed windows which are internally shaped as a comb along the inward side of the radiator, and are smooth along the opposite side.
  • the single radiators are manufactured by cutting transversely at intervals suitably profiled extruded aluminum bars.
  • the outermost radiators because of their closed profile, have the drawback of requiring more complex and expensive extrusion techniques employing floating core extruders.
  • both the outermost radiators and the inner radiators tend to bend, because their comb-shaped walls become cool slowly than the opposite walls.
  • the outermost radiators are required to be rectilinear for a good electric and thermic contact between the radiators and the PTC pellets.
  • the inner radiators are biased against the outermost radiators by the leaf springs, so that, if the outermost radiators are bent, the inner radiators will be bent too, which circumstance affects the good contact between the radiators and the PTC pellets.
  • an electric heater according to a preferred embodiment of the invention comprises six elongated radiators 10, 12, 14, 16, 18, 20, which are arranged one above another to form a stack.
  • Each radiator is a bar of aluminum or of a similar conductive material, that is fretted to allow air to flow across it.
  • each of the radiators is flat on one side and is fretted with comb fins such as 24, 26, 28 on the opposite side.
  • the comb fins of the four innermost radiators 12, 14, 16, 18 are uneven in length, with longer fins such as 24 alternating with groups of shorter fins such as 26, 28, while the comb fins of the outermost radiators 10, 20 are equal in length.
  • Each of the six radiators is provided with a respective electric terminal, preferably made as an integral lug such as 32, carrying a swaged metal tongue 34.
  • the six radiators are arranged in parallel pairs 10 and 12, 14 and 16, 18 and 20, with mutually facing flat surfaces in each pair.
  • a number of PTC pellets (not shown) are clamped to be in thermal and electric conduction with each radiator of the associated pair.
  • PTC pellet is encased in a respective rectangular gasket such as 38, made of a soft synthetic material such as a silicone resin, which makes a tight contact with the adjacent flat surfaces of the encompassing radiators, so that the PTC pellet is protected from the flow of air and therefore from oxidation which might be caused by humidity and pollutants.
  • a respective rectangular gasket such as 38, made of a soft synthetic material such as a silicone resin, which makes a tight contact with the adjacent flat surfaces of the encompassing radiators, so that the PTC pellet is protected from the flow of air and therefore from oxidation which might be caused by humidity and pollutants.
  • the combs of radiators 12 and 14, as well as the combs of radiators 16 and 18, also face each other, and the uneven comb fins are designed so that in each radiator a longer fin 24 will be aligned with a short fin 26, 28 of the adjacent radiator.
  • Steel slats 40, 42 are arranged between the facing combs of radiators 12, 14 and 16, 18, respectively, so that they will be elastically deformed by the interplay of the longer and shorter fins of the facing combs, to operate as a leaf spring acting to expand the stack of radiators in a crosswise direction and to bias the facing flat surfaces in each pair of radiators against each other, for a good contact with the sandwiched PTC pellets.
  • the stack of radiators with the PTC pallets and the steel slats, are sandwiched between two rigid, U-shaped longitudinal beams 43 which are biased with their open side against the crests of the combs of the outermost radiators 10, 20 by two brackets 44, 46 that are attached to the opposite ends of the stack of radiators, in order to maintain the unit assembled.
  • Longitudinal beams 43 are shaped with overhanging longitudinal edges 43a which laterally overlap the crests of the comb fins to retain the radiator laterally.
  • Brackets 44, 46 are preferably molded in a rigid synthetic material. As shown in Fig. 2, bracket 44 is provided with abutments 48 to retain longitudinal beams 43 at their ends, as well as with lateral guides 49 to confine the stack of radiators laterally. Bracket 44 is also provided with transoms 50, 52 abutting on respective ledges 54, 56 projecting at the ends of the outermost radiators 10, 20. Bracket 44 also has two pairs of latches 58, 60, which grasp by snap action respective holes 62, 64 at the ends of the longitudinal beams on the side walls thereof.
  • Bracket 46 is similar to bracket 44 in having abutments 66 to retain longitudinal beams 43 at their ends, lateral guides 68 to retain the stack of radiators laterally, projections (not shown) abutting on respective lugs 32 of the outermost radiators 10, 20, and elastic latches 70 grasping holes 72 made in the longitudinal beams.
  • bracket 46 is also provided with mounting eyelets 74 for mounting the heater within the ventilation system.
  • bracket 46 has openings such as 76 to house the contact terminals 34 for connection to external circuitry not shown.
  • Ring 78 is suitably sized to tightly enclose the stack in order to prevent the longitudinal beams from bending, and is shaped with undulations 78a which provide it with a limited elastic compliance, and with a stiffening, peripheral ridge 78b on its outer surface.
  • Ring 78 also has a pair of bosses 80 on its inner surface, which are arranged to restrainedly engage by snap action respective holes 82 made on the back of the longitudinal beams in a middle position thereof.
  • the rigid longitudinal beams may be manufactured in a easy and inexpensive way by extrusion or by bending suitably profiled steel sheets. Furthermore, the total height of each one of the outermost radiators in association with the corresponding longitudinal beam substantially equals the height of the outermost radiators of the electric heaters of the prior art, so that the sizes are not increased.
  • the stack comprising the longitudinal beams, the radiators and the PTC pellets, may be formed in a jig by merely placing the several parts one above the the other, and then the heater is completed by fitting the ring onto the stack and by shoving it until the bosses engage the central holes in the longitudinal beam, and by approaching the brackets to the ends of the stack and pushing until the latches click into engagement.
  • FIG. 3 An alternative embodiment of the invention in shown in Figs. 3, 4, where a ⁇ -shaped elongated insert 86 is arranged between longitudinal beams 10, 12 and the combs of the corresponding outermost radiators 10, 20.
  • the insert is received between overhanging edges 43a of longitudinal beam 43, and is arranged with its middle ridge 86a projecting into longitudinal beam 43.
  • An elongated elastic blade 88 is arranged between longitudinal beam 43 and elongated insert 86 in an elasically deformed configuration astride middle ridge 86a, with its longitudinal edges biased against the longitudinal edges of elongated insert 86 by the longitudinal corners 43b defined in the concavity of longitudinal beam 43, in such a way as to bias insert 86 against the radiator.
  • the above elastic assemblies act to make the pressure of the longitudinal beams more uniform along the total length of the corresponding outermost radiators, in order to further improve the contact with the sandwiched PTC pallets.
  • U-shaped longitudinal beams are preferred because of their high flexural strength and ease of manufacturing, other profiles might also be used for the longitudinal beams, provided that they give an adequate rigidity to the structure.
  • stiffening ring might be useful but not-essential for the invention, because the U-shaped longitudinal beams have a high flexural strength per se.

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)
  • Air-Conditioning For Vehicles (AREA)
EP20050425415 2005-06-09 2005-06-09 Réchauffeur électrique pour système de ventilation d'automobile Expired - Fee Related EP1731852B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200560009157 DE602005009157D1 (de) 2005-06-09 2005-06-09 Elektrischer Heizer für Fahrzeugventilationsanordnung
EP20050425415 EP1731852B1 (fr) 2005-06-09 2005-06-09 Réchauffeur électrique pour système de ventilation d'automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050425415 EP1731852B1 (fr) 2005-06-09 2005-06-09 Réchauffeur électrique pour système de ventilation d'automobile

Publications (2)

Publication Number Publication Date
EP1731852A1 true EP1731852A1 (fr) 2006-12-13
EP1731852B1 EP1731852B1 (fr) 2008-08-20

Family

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EP20050425415 Expired - Fee Related EP1731852B1 (fr) 2005-06-09 2005-06-09 Réchauffeur électrique pour système de ventilation d'automobile

Country Status (2)

Country Link
EP (1) EP1731852B1 (fr)
DE (1) DE602005009157D1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007071335A1 (fr) * 2005-12-20 2007-06-28 Beru Aktiengesellschaft Systeme de chauffage electrique, notamment pour automobiles
EP2056036A1 (fr) * 2007-10-31 2009-05-06 Valeo Systemes Thermiques Dispositif de chauffage électrique d'un flux d'air circulant a l'intérieur d'une installation de ventilation, de chauffage et/ou de climatisation d'un véhicule automobile
EP2019268A3 (fr) * 2007-07-18 2010-07-07 Eberspächer catem GmbH & Co. KG Chauffage électrique
EP2282605A1 (fr) * 2009-08-01 2011-02-09 BorgWarner BERU Systems GmbH Dispositif de chauffage
DE202010011016U1 (de) 2010-08-04 2011-10-10 Ingo Schehr Elektrisches Heizmodul mit PTC-Element zum elektrischen Erwärmen eines Luftstroms
WO2012016687A1 (fr) 2010-08-04 2012-02-09 Ingo Schehr Module de chauffage électrique comprenant un élément à coefficient de température positif (ptc), conçu pour assurer le chauffage électrique d'un courant d'air
DE102010048593A1 (de) * 2010-10-18 2012-04-19 Eichenauer Heizelemente Gmbh & Co. Kg Modulare Heizvorrichtung
CN103171404A (zh) * 2011-12-22 2013-06-26 博格华纳贝鲁系统有限公司 一种电加热装置
FR3032390A1 (fr) * 2015-02-10 2016-08-12 Valeo Systemes Thermiques Boitier d'un dispositif de chauffage electrique
FR3032388A1 (fr) * 2015-02-10 2016-08-12 Valeo Systemes Thermiques Dispositif de chauffage electrique
FR3056456A1 (fr) * 2016-09-29 2018-03-30 Valeo Systemes Thermiques Cadre d'un dispositif de chauffage electrique comprenant un moyen de deformation plastique
FR3078020A1 (fr) * 2018-02-19 2019-08-23 Valeo Systemes Thermiques Cadre d'un dispositif de chauffage electrique comprenant au moins un element deformable de maintien d'elements chauffants

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5562844A (en) * 1992-06-23 1996-10-08 David & Baader - Dbk- Spezialfabrik Elektrischer Apparate Und Heizwiderstande Gmbh Ptc heater radiator with frame members applying pressure to heaters
EP1370117A2 (fr) * 2002-06-05 2003-12-10 CEBI S.p.A. Radiateur électrique avec éléments PTC, en particulier pour systèmes de ventilation de cabine d' automobile
EP1462733A1 (fr) * 2003-03-25 2004-09-29 Valeo Climatisation Dispositif de chauffage électrique comprenant un corps chauffant
EP1574791A1 (fr) 2004-03-09 2005-09-14 CEBI S.p.A. Dispositif de chauffage électrique pour système de ventilation d'automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5562844A (en) * 1992-06-23 1996-10-08 David & Baader - Dbk- Spezialfabrik Elektrischer Apparate Und Heizwiderstande Gmbh Ptc heater radiator with frame members applying pressure to heaters
EP1370117A2 (fr) * 2002-06-05 2003-12-10 CEBI S.p.A. Radiateur électrique avec éléments PTC, en particulier pour systèmes de ventilation de cabine d' automobile
EP1462733A1 (fr) * 2003-03-25 2004-09-29 Valeo Climatisation Dispositif de chauffage électrique comprenant un corps chauffant
EP1574791A1 (fr) 2004-03-09 2005-09-14 CEBI S.p.A. Dispositif de chauffage électrique pour système de ventilation d'automobile

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8975561B2 (en) 2005-12-20 2015-03-10 Borgwarner Beru Systems Gmbh Electric heating apparatus, especially for motor vehicles
WO2007071335A1 (fr) * 2005-12-20 2007-06-28 Beru Aktiengesellschaft Systeme de chauffage electrique, notamment pour automobiles
EP2019268A3 (fr) * 2007-07-18 2010-07-07 Eberspächer catem GmbH & Co. KG Chauffage électrique
EP2056036A1 (fr) * 2007-10-31 2009-05-06 Valeo Systemes Thermiques Dispositif de chauffage électrique d'un flux d'air circulant a l'intérieur d'une installation de ventilation, de chauffage et/ou de climatisation d'un véhicule automobile
CN101482316B (zh) * 2007-10-31 2014-03-19 法雷奥热系统公司 通风、加热和/或空调设备内的流动气流的电加热装置
EP2282605A1 (fr) * 2009-08-01 2011-02-09 BorgWarner BERU Systems GmbH Dispositif de chauffage
DE202010011016U1 (de) 2010-08-04 2011-10-10 Ingo Schehr Elektrisches Heizmodul mit PTC-Element zum elektrischen Erwärmen eines Luftstroms
WO2012016687A1 (fr) 2010-08-04 2012-02-09 Ingo Schehr Module de chauffage électrique comprenant un élément à coefficient de température positif (ptc), conçu pour assurer le chauffage électrique d'un courant d'air
DE102010033310A1 (de) 2010-08-04 2012-02-09 Ingo Schehr Elektrisches Heizmodul mit PTC-Element zum elektrischen Erwärmen eines Luftstroms
DE102010033310B4 (de) * 2010-08-04 2012-06-14 Ingo Schehr Elektrisches Heizmodul mit PTC-Element zum elektrischen Erwärmen eines Luftstroms
DE102010048593A1 (de) * 2010-10-18 2012-04-19 Eichenauer Heizelemente Gmbh & Co. Kg Modulare Heizvorrichtung
DE102010048593B4 (de) * 2010-10-18 2015-03-19 Eichenauer Heizelemente Gmbh & Co. Kg Modulare Heizvorrichtung
DE102011056930A1 (de) 2011-12-22 2013-06-27 Borgwarner Beru Systems Gmbh Elektrische Heizeinrichtung
CN103171404A (zh) * 2011-12-22 2013-06-26 博格华纳贝鲁系统有限公司 一种电加热装置
FR3032390A1 (fr) * 2015-02-10 2016-08-12 Valeo Systemes Thermiques Boitier d'un dispositif de chauffage electrique
FR3032388A1 (fr) * 2015-02-10 2016-08-12 Valeo Systemes Thermiques Dispositif de chauffage electrique
WO2016128398A1 (fr) * 2015-02-10 2016-08-18 Valeo Systemes Thermiques Dispositif de chauffage electrique
WO2016128421A1 (fr) * 2015-02-10 2016-08-18 Valeo Systemes Thermiques Boîtier d'un dispositif de chauffage electrique
DE112016000688B4 (de) 2015-02-10 2022-10-06 Valeo Systemes Thermiques Elektrische Heizvorrichtung
FR3056456A1 (fr) * 2016-09-29 2018-03-30 Valeo Systemes Thermiques Cadre d'un dispositif de chauffage electrique comprenant un moyen de deformation plastique
WO2018060620A1 (fr) * 2016-09-29 2018-04-05 Valeo Systemes Thermiques Cadre d'un dispositif de chauffage electrique comprenant un moyen de deformation plastique
FR3078020A1 (fr) * 2018-02-19 2019-08-23 Valeo Systemes Thermiques Cadre d'un dispositif de chauffage electrique comprenant au moins un element deformable de maintien d'elements chauffants

Also Published As

Publication number Publication date
DE602005009157D1 (de) 2008-10-02
EP1731852B1 (fr) 2008-08-20

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