EP1646055A1 - PTC element emdedded in a heat conducting resin body - Google Patents

PTC element emdedded in a heat conducting resin body Download PDF

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Publication number
EP1646055A1
EP1646055A1 EP05021611A EP05021611A EP1646055A1 EP 1646055 A1 EP1646055 A1 EP 1646055A1 EP 05021611 A EP05021611 A EP 05021611A EP 05021611 A EP05021611 A EP 05021611A EP 1646055 A1 EP1646055 A1 EP 1646055A1
Authority
EP
European Patent Office
Prior art keywords
ptc
heat conducting
dissipators
insert
resin body
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Withdrawn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
EP05021611A
Other languages
German (de)
French (fr)
Inventor
Mauro Da Ros
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of EP1646055A1 publication Critical patent/EP1646055A1/en
Withdrawn legal-status Critical Current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
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/024—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being hermetically sealed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/028—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/08—Cooling, heating or ventilating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/02—Apparatus or processes specially adapted for manufacturing resistors adapted for manufacturing resistors with envelope or housing
    • 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
    • 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
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Control Of Eletrric Generators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Details Of Resistors (AREA)
  • Thermistors And Varistors (AREA)

Abstract

A PTC resistor comprising two metal dissipators (4) between which a PTC insert (2) is interposed and which are provided with conductor cables (6), characterised in that the dissipators (4) and the insert (2) interposed between them are housed in the interior of a heat conducting resin body (8).

Description

  • The present invention relates to a PTC resistor.
  • PTC resistors used in various domestic applications are known, including room heating, water evaporation by refrigerator defrosting, etc.
  • These resistors are based on PTC (positive temperature coefficient) technology; they not only emit heat but when a predetermined temperature has been reached they maintain it without requiring the use of an auxiliary thermostat and without the danger of overheating.
  • The resistor consists substantially of a steel tube filled with MgO and in which two mutually facing semicylindrical aluminium dissipators are inserted, between which a PTC insert is inserted and retained by two silicone rings.
  • The two dissipators are connected to the ends of two conductor cables covered by an insulating sheath which emerges from the tube via a discoidal portion of sealing material.
  • These known resistors present however the drawback of constructional complexity in that a tortuous channel has to be formed for passage of the conductor cables through the sealing, and to allow escape of gas formed by the MgO and the boric acid contained in it. To this must be added the fact that the presence of these channels provides access from the outside, with consequent possible loss of insulation.
  • According to the invention, this drawback is eliminated by a PTC resistor comprising two metal dissipators between which a PTC insert is interposed and which are provided with conductor cables, characterised in that the dissipators and the insert interposed between them are housed in the interior of a heat conducting resin body.
  • The present invention is furth er described hereinafter with reference to the accompanying drawings, in which:
    • Figure 1 is a longitudinal section through a resistor of the invention,
    • Figure 2 is a cross-section therethrough.
  • As can be seen from the figures, the PTC resistor of the invention comprises substantially a PTC insert 2 interposed between two semicylindrical aluminium metal dissipators 4 to which the ends of two conductor cables 6 are connected.
  • The dissipators and the insert 2 are inserted into the interior of a substantially cylindrical body 8 obtained by injecting a heat conducting resin, for example an epoxy resin, into a mould in which the dissipators 4 with the insert 2 interposed have been previously placed.
  • The body 8 is inserted at one end into a connection sleeve.
  • In this manner the resin not only externally encloses the plates 4 but also lies within the space bounded by those surfaces of the mutually facing dissipators which are not occupied by the PTC insert, to provide considerable insulation even where the conductor cables 6 pass.

Claims (4)

  1. A PTC resistor comprising two metal dissipators (4) between which a PTC insert (2) is interposed and which are provided with conductor cables (6), characterised in that the dissipators (4) and the insert (2) interposed between them are housed in the interior of a heat conducting resin body (8).
  2. A resistor as claimed in claim 1, characterised in that the body is of cylindrical shape.
  3. A resistor as claimed in claim 1, characterised in that the resin is an epoxy resin.
  4. A resistor as claimed in claim 1, characterised in that the body (8) is inserted at one end into a connection sleeve (10).
EP05021611A 2004-10-07 2005-10-04 PTC element emdedded in a heat conducting resin body Withdrawn EP1646055A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVE20040020 ITVE20040020U1 (en) 2004-10-07 2004-10-07 PTC RESISTOR.

Publications (1)

Publication Number Publication Date
EP1646055A1 true EP1646055A1 (en) 2006-04-12

Family

ID=35517205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05021611A Withdrawn EP1646055A1 (en) 2004-10-07 2005-10-04 PTC element emdedded in a heat conducting resin body

Country Status (2)

Country Link
EP (1) EP1646055A1 (en)
IT (1) ITVE20040020U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355614A1 (en) * 2010-01-29 2011-08-10 Eichenauer Heizelemente GmbH & Co. KG Electric heater and method for producing same
EP2397788A1 (en) * 2010-06-17 2011-12-21 Behr GmbH & Co. KG Heat exchanger and method for manufacturing a heat exchanger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210800A (en) * 1977-02-21 1980-07-01 U.S. Philips Corporation Heating element comprising a PTC-resistor body
DE3201367A1 (en) * 1982-01-19 1983-07-28 Türk & Hillinger GmbH, 7200 Tuttlingen Electrical resistance heater comprising PTC resistance elements
DE3730161A1 (en) * 1987-09-09 1989-03-30 Braun Ag Electrical heating element
JPH04153264A (en) * 1990-10-16 1992-05-26 Toyobo Co Ltd Sealing resin composition
JPH0974001A (en) * 1995-09-04 1997-03-18 Murata Mfg Co Ltd Thermistor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210800A (en) * 1977-02-21 1980-07-01 U.S. Philips Corporation Heating element comprising a PTC-resistor body
DE3201367A1 (en) * 1982-01-19 1983-07-28 Türk & Hillinger GmbH, 7200 Tuttlingen Electrical resistance heater comprising PTC resistance elements
DE3730161A1 (en) * 1987-09-09 1989-03-30 Braun Ag Electrical heating element
JPH04153264A (en) * 1990-10-16 1992-05-26 Toyobo Co Ltd Sealing resin composition
JPH0974001A (en) * 1995-09-04 1997-03-18 Murata Mfg Co Ltd Thermistor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 437 (C - 0984) 11 September 1992 (1992-09-11) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07 31 July 1997 (1997-07-31) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355614A1 (en) * 2010-01-29 2011-08-10 Eichenauer Heizelemente GmbH & Co. KG Electric heater and method for producing same
US8541722B2 (en) 2010-01-29 2013-09-24 Eichenauer Heizelemente Gmbh & Co. Kg Electrical heater and method for manufacturing an electrical heater
EP2397788A1 (en) * 2010-06-17 2011-12-21 Behr GmbH & Co. KG Heat exchanger and method for manufacturing a heat exchanger

Also Published As

Publication number Publication date
ITVE20040020U1 (en) 2005-01-07

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