EP1845317A1 - Elektrisches Heizgerät mit PTC Pellets zum Heizen des Innnenraums von Fahrzeugen - Google Patents

Elektrisches Heizgerät mit PTC Pellets zum Heizen des Innnenraums von Fahrzeugen Download PDF

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Publication number
EP1845317A1
EP1845317A1 EP06425268A EP06425268A EP1845317A1 EP 1845317 A1 EP1845317 A1 EP 1845317A1 EP 06425268 A EP06425268 A EP 06425268A EP 06425268 A EP06425268 A EP 06425268A EP 1845317 A1 EP1845317 A1 EP 1845317A1
Authority
EP
European Patent Office
Prior art keywords
radiators
heater
fins
bent
strip
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.)
Withdrawn
Application number
EP06425268A
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English (en)
French (fr)
Inventor
Mauro Bregolin
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 EP06425268A priority Critical patent/EP1845317A1/de
Publication of EP1845317A1 publication Critical patent/EP1845317A1/de
Withdrawn legal-status Critical Current

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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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting 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
    • 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

  • the present invention relates to an electric heater with PTC pellets for heating the interior compartment of vehicles.
  • Heat exchangers which are located in the air path of the ventilation system and are connected to the hydraulic circuit of the engine cooling system of the vehicle. More recently, in order to immediately provide an effective heating action, even at the initial start of the car, heat exchangers are integrated with electric heaters that generally employ PTC resistors (also called thermistors) as heating sources. Such electric heaters are installed within the air conduit of the ventilation system, whereby the airflow passes through them, and they are usually activated for transient periods.
  • PTC resistors also called thermistors
  • EP-A-1 574 791 describes an electric heater of the above type, in which PTC pellets are clamped between stacked radiators consisting of aluminum bars fretted with comb-shaped fins, which bars lead the electric current to the PTC pellets and are in thermal and electric contact therewith.
  • Steel slats are arranged between the opposing combs of the the inner radiators, and operate as leaf springs in biasing the radiators against each other in a crosswise direction to provide a good contact with the sandwiched PTC pellets.
  • a pair of brackets which are 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 comb-shaped radiators are typically manufactured by transversely slicing an alluminum extrusion of a suited profile.
  • a drawback deriving from this embodiment of the radiator is that burrs are generated during the slicing process which in operation, when the ventilation airflow passes through the radiator, can get detached from the radiator and, consequently, enter the interior compartment.
  • 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 upon the other to form a stack.
  • each radiator is made from an alluminum plate 22 whose longitudinal edges are both comb-like fretted, with respective arrays of elongated, narrow fins such as 24 projecting laterally from a continuous, middle strip 26.
  • the fins are bent at right angles at their root and are U-bent inwardly at a middle area (Fig. 4), with a configuration such as to enhance the thermal exchange with the environment.
  • Each of the six radiators is provided with a respective electric terminal, preferably in form of a lug 28 which integrally projects from middle strip 26 and carries a swaged metal tongue 30 at its end.
  • Lug 28 is first bent at right angles in the direction of fins 24, and then is bent outwardly in a cantilever fashion.
  • the six radiators are arranged in parallel pairs 10-12, 14-16, and 18-20, with the free surfaces of the middle strips 26 which face each other in each pair.
  • Four PTC pellets 36 are clamped between the middle strips of each pair of radiators and are in relation of thermal and electrical conduction with both the radiators of the corresponding pair.
  • a gasket 38 made of a soft synthetic material, such as a silicone resin, is also clamped between the middle strips in each pair, and has four openings such as 40 in which the PTC pellets are received. The gasket makes a tight contact with the adjacent flat surfaces of the radiators, so that the PTC pellets are protected from the airflow and, consequently, from oxidation due to humidity and pollutants.
  • An insulating strip 42 made of a synthetic material is clamped between each pair of radiators which face each other in the direction of the fins, i.e., the pair 12-14 and the pair 16-18.
  • the stack of radiators with the PTC pallets, the gaskets and the insulating strips, are sandwiched between two rigid, C-shaped longitudinal beams 43 which are biased with their back walls 43a against the fins of the outermost radiators 10, 20, by means of three tie rods 46 having respective screw nuts 47 tightened at their ends, preferably with a control upon the driving torque applied to the nuts, in order to maintain the unit assembled with a correct pressure upon the PTC pellets.
  • Brackets 44, 45 are anchored to the opposite ends of the stack of radiators. Brackets 44, 45 are preferably molded of a rigid, synthetic material. Bracket 44 is provided with projections 48 which engage the ends of longitudinal beams 43, as well as with lateral hook-like arms 50 which restrainedly engage corresponding lateral slots 52 in longitudinal beams 43 with a snap action.
  • Bracket 45 is similar to bracket 44 in that it has centering projections 66 which engage the ends of longitudinal beams 43, and lateral hook-like arms 68 which restrainedly engage corresponding slots 70 in longitudinal beams 43. Bracket 45 is also provided with eyelets 72, 74 for the installation of the heater in the ventilation system, and with openings (not shown) in which the electric terminals are inserted for their connection to external circuitry (not shown).
  • the radiators may be manufactrured in a conventional way by shearing an alluminum plate with a cutting tool suited to form a comb-like profile. As the person skilled in the art will immediately understand, this shearing operation upon a thin alluminum plate produces a clean cut without formation of burrs, so that further finishing operations are not required.
  • a further advantage of the above radiators is that they have a wide thermal exchange surface with a reduced volume of material, with consequent improved efficiency.
  • 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 tightening the tie rods and by approaching the brackets to the ends of the stack, until hook-like arms 50, 68 engage the slots in longitudinal beams 43.
  • each radiator is made from an alluminum plate 122 having both its longitudinal edges perforated with arrays of L-shaped cuts which are open to the lateral edge of the plate and have one side of the L arranged at right angles to the longitudinal dimension of the plate, whereby arrays of fins such as 124 are defined which laterally project from a continuous, middle strip 126.
  • Each fin 124 is bent at right angles along a transverse line T passing through the inner end of the L-shaped cuts, and is also bent at right angles at its root (Fig. 6).
EP06425268A 2006-04-14 2006-04-14 Elektrisches Heizgerät mit PTC Pellets zum Heizen des Innnenraums von Fahrzeugen Withdrawn EP1845317A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06425268A EP1845317A1 (de) 2006-04-14 2006-04-14 Elektrisches Heizgerät mit PTC Pellets zum Heizen des Innnenraums von Fahrzeugen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425268A EP1845317A1 (de) 2006-04-14 2006-04-14 Elektrisches Heizgerät mit PTC Pellets zum Heizen des Innnenraums von Fahrzeugen

Publications (1)

Publication Number Publication Date
EP1845317A1 true EP1845317A1 (de) 2007-10-17

Family

ID=36928368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425268A Withdrawn EP1845317A1 (de) 2006-04-14 2006-04-14 Elektrisches Heizgerät mit PTC Pellets zum Heizen des Innnenraums von Fahrzeugen

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EP (1) EP1845317A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102143618A (zh) * 2010-02-03 2011-08-03 钡泰电子陶瓷股份有限公司 鳍片式陶瓷加热器
CN103874249A (zh) * 2014-03-25 2014-06-18 常熟市林芝电热器件有限公司 Ptc发热器
CN111405690A (zh) * 2020-03-31 2020-07-10 宁波亚希尔电器有限公司 一种方便拆卸的ptc加热器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031171A (en) * 1960-03-22 1962-04-24 Robbins & Myers Radiation fin structure for rod-like heating elements
GB1480833A (en) * 1973-06-29 1977-07-27 Applic Thermo Electr Applimo S Electrical heating devices
EP1407907A1 (de) * 2002-10-07 2004-04-14 Behr GmbH & Co. Vorrichtung zum Austausch von Wärme
WO2005049350A1 (en) * 2003-11-18 2005-06-02 Woory Industrial Company, Ltd. Ptc element module and pre-heater for vehicles including the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031171A (en) * 1960-03-22 1962-04-24 Robbins & Myers Radiation fin structure for rod-like heating elements
GB1480833A (en) * 1973-06-29 1977-07-27 Applic Thermo Electr Applimo S Electrical heating devices
EP1407907A1 (de) * 2002-10-07 2004-04-14 Behr GmbH & Co. Vorrichtung zum Austausch von Wärme
WO2005049350A1 (en) * 2003-11-18 2005-06-02 Woory Industrial Company, Ltd. Ptc element module and pre-heater for vehicles including the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102143618A (zh) * 2010-02-03 2011-08-03 钡泰电子陶瓷股份有限公司 鳍片式陶瓷加热器
CN102143618B (zh) * 2010-02-03 2013-03-06 钡泰电子陶瓷股份有限公司 鳍片式陶瓷加热器
CN103874249A (zh) * 2014-03-25 2014-06-18 常熟市林芝电热器件有限公司 Ptc发热器
CN103874249B (zh) * 2014-03-25 2015-07-08 常熟市林芝电热器件有限公司 Ptc发热器
CN111405690A (zh) * 2020-03-31 2020-07-10 宁波亚希尔电器有限公司 一种方便拆卸的ptc加热器

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