EP2193690A1 - Cartridge heater - Google Patents

Cartridge heater

Info

Publication number
EP2193690A1
EP2193690A1 EP07736850A EP07736850A EP2193690A1 EP 2193690 A1 EP2193690 A1 EP 2193690A1 EP 07736850 A EP07736850 A EP 07736850A EP 07736850 A EP07736850 A EP 07736850A EP 2193690 A1 EP2193690 A1 EP 2193690A1
Authority
EP
European Patent Office
Prior art keywords
housing
heater according
ptc resistor
disposed
heater
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
EP07736850A
Other languages
German (de)
French (fr)
Other versions
EP2193690B1 (en
Inventor
Riccardo Ravaglia
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.)
ROTFIL Srl
Original Assignee
ROTFIL Srl
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 ROTFIL Srl filed Critical ROTFIL Srl
Publication of EP2193690A1 publication Critical patent/EP2193690A1/en
Application granted granted Critical
Publication of EP2193690B1 publication Critical patent/EP2193690B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H05B3/40—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

Definitions

  • the present invention relates to a cartridge heater in particular for water- or oil-based electric radiators.
  • a heater of this type more particularly comprises an outer housing, at least one PTC (positive temperature coefficient) resistor disposed in the housing and electrically insulating material interposed radially between the housing and the PTC resistor.
  • PTC positive temperature coefficient
  • this electrically insulating material typically consists at least partly of magnesium oxide disposed in the form of a circular crown which is radially internal with respect to the housing.
  • magnesium oxide is a highly hygroscopic material which makes the environment inside the heater rather moist and likely to damage the PTC resistors and generate internal short-circuits with a slow but progressive deterioration of the properties of these resistors.
  • the present invention relates to a heater of the type described above, characterized in that the electrically insulating material interposed radially between the housing and the at least one PTC resistor consists substantially of a polyimide obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine.
  • the insulating material of the heater of the invention does not therefore comprise hygroscopic material, in particular magnesium oxide, with the result that special leak-tight closures such as caps or the like are not required. It therefore has a simplified and economic structure which can be produced by production processes which are not complex, are inexpensive and can be readily automated.
  • the low residual moisture in the heater of the invention is automatically eliminated each time that it is started with the result that it is highly reliable and has a very long service life.
  • the resistance and dielectric rigidity of the insulating material of the heater of the invention are much greater than those of the insulating materials based on magnesium oxide which are conventionally used.
  • Fig. 1 is a view in longitudinal section of a heater of the invention
  • Fig. 2 is a view in cross-section along the line H-H of Fig. 1;
  • Fig. 3 is a view in cross-section corresponding to Fig. 2, showing further possibilities for the connection of conducting pins to electrodes of the heater of the invention;
  • Figs. 4 and 5 are perspective views of respective embodiments of electrodes adapted to provide the connections of Fig. 3.
  • a cartridge heater in particular for electric radiators, comprises (Figs. 1 and 2) an outer housing 10 of tubular shape and circular section and a plurality of PTC resistors 12 disposed longitudinally in succession in an inner diametrical segment of the housing 10.
  • a first and a second electrode 14 of approximately semi-eircular cross-section are disposed on opposite sides of the PTC resistors 12 disposed in succession. These electrodes 14 are connected in a manner known per se (and not shown in Figs. 1 and 2) by means of metal pins 16 surrounded by insulating sheaths 18 to a cable 20 supplying electric current which projects from a threaded cap 22 closing one end of the housing 10. The opposite end is closed by a disc 24 and by a welded base 26.
  • the assembly formed by the PTC resistors 12 and the electrodes 14 has a substantially cylindrical overall shape and is surrounded by three electrically insulating layers 28 disposed coaxially about one another and surrounded in turn by the housing 10.
  • the housing 10 is compressed by conventional appliances, for instance a hammering machine, a rolling mill or a radial press, in order to obtain a solid and compact structure.
  • the insulating layers 28 are substantially formed by a polyimide obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine.
  • a polyimide of this kind is marketed by the company Du Pont De Nemours under the registered trade mark Kapton and may contain conventional additives for plastics materials, as well as protective films.
  • the insulating layers 28 may for instance be in the form of a spiral-wound strip or a tube.
  • the heater of the invention satisfies the CEI EN 60335-1 specifications under which at least a double insulation is required. If the heater has to satisfy less strict specifications, only one insulating layer 28 could be provided. Vice versa, the number of insulating layers 28 could be increased to cope with particularly onerous uses.
  • the polyimide used as insulating material is not hygroscopic with the result that the heater does not require special closures which prevent moisture from penetrating therein, thereby greatly simplifying its structure.
  • the dielectric rigidity of the insulating material used is very high with the result that the electric performance of the heater is excellent.
  • Fig. 3 shows further possibilities for the connection of the metal conducting pins 16 to the electrodes 14 which have a cross-section shaped as a circular segment with a perimeter defined by a circumferential arc 30 and by a chord 32 (which may possibly correspond to the diameter of the circumference).
  • the electrodes 14 have a longitudinal seat adapted to house the respective pin 16, which seat may be provided -either at the perimetral section of the electrode 14 defined by the chord 32 (see reference numeral 34a) or in the body of the electrode (see reference numeral 34b).
  • Fig. 3 shows both constructional solutions, although it will be appreciated that one only will be used in practice, while Figs. 4 and 5 show the two solutions separately.
  • the pin 16 is inserted in the respective seat 34a or 34b in which it is then clamped during the above-mentioned compression stage so as to ensure electrical continuity.
  • the pins 16 are on the contrary located in seats provided in the perimetral section of the electrode 14 defined by the circumferential arc 30.
  • This location has the drawback that, during the compression stage, any projections, cutting edges or irregularities may damage the adjacent insulating layers 28 thereby comprising their electrical insulation properties.
  • This drawback is remedied by locating the pins 16 according to the invention, since any contact between the seats 34a and 34b and the insulating layers 28 is prevented.

Landscapes

  • Resistance Heating (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Cookers (AREA)

Abstract

Cartridge heater The cartridge heater, in particular for electric radiators, comprises an outer housing (10), one or more PTC resistors (12) disposed in the housing (10) and electrically insulating material interposed radially between the housing (10) and the PTC resistors (12). This electrically insulating material consists substantially of a polyimide obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine.

Description

Cartridge heater
The present invention relates to a cartridge heater in particular for water- or oil-based electric radiators.
A heater of this type more particularly comprises an outer housing, at least one PTC (positive temperature coefficient) resistor disposed in the housing and electrically insulating material interposed radially between the housing and the PTC resistor.
According to the prior art, this electrically insulating material typically consists at least partly of magnesium oxide disposed in the form of a circular crown which is radially internal with respect to the housing.
However, magnesium oxide is a highly hygroscopic material which makes the environment inside the heater rather moist and likely to damage the PTC resistors and generate internal short-circuits with a slow but progressive deterioration of the properties of these resistors.
These problems may be prevented by providing special leak-tight closures such as resin and/or rubber caps and the like which prevent any penetration of moisture. The use of such structural arrangements nevertheless complicates the structure of the heater.
In order to remedy these drawbacks of the prior art, the present invention relates to a heater of the type described above, characterized in that the electrically insulating material interposed radially between the housing and the at least one PTC resistor consists substantially of a polyimide obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine.
The insulating material of the heater of the invention does not therefore comprise hygroscopic material, in particular magnesium oxide, with the result that special leak-tight closures such as caps or the like are not required. It therefore has a simplified and economic structure which can be produced by production processes which are not complex, are inexpensive and can be readily automated. The low residual moisture in the heater of the invention is automatically eliminated each time that it is started with the result that it is highly reliable and has a very long service life.
Moreover, the resistance and dielectric rigidity of the insulating material of the heater of the invention are much greater than those of the insulating materials based on magnesium oxide which are conventionally used.
Further advantages and characteristic features of the invention are set out in the following detailed description, given solely by way of non-limiting example, with reference to the accompanying drawings, in which:
Fig. 1 is a view in longitudinal section of a heater of the invention;
Fig. 2 is a view in cross-section along the line H-H of Fig. 1;
Fig. 3 is a view in cross-section corresponding to Fig. 2, showing further possibilities for the connection of conducting pins to electrodes of the heater of the invention;
Figs. 4 and 5 are perspective views of respective embodiments of electrodes adapted to provide the connections of Fig. 3.
A cartridge heater, in particular for electric radiators, comprises (Figs. 1 and 2) an outer housing 10 of tubular shape and circular section and a plurality of PTC resistors 12 disposed longitudinally in succession in an inner diametrical segment of the housing 10.
A first and a second electrode 14 of approximately semi-eircular cross-section are disposed on opposite sides of the PTC resistors 12 disposed in succession. These electrodes 14 are connected in a manner known per se (and not shown in Figs. 1 and 2) by means of metal pins 16 surrounded by insulating sheaths 18 to a cable 20 supplying electric current which projects from a threaded cap 22 closing one end of the housing 10. The opposite end is closed by a disc 24 and by a welded base 26.
The assembly formed by the PTC resistors 12 and the electrodes 14 has a substantially cylindrical overall shape and is surrounded by three electrically insulating layers 28 disposed coaxially about one another and surrounded in turn by the housing 10. During the production process of the heater of the invention, once the above-mentioned components have been assembled in the housing 10, the latter is compressed by conventional appliances, for instance a hammering machine, a rolling mill or a radial press, in order to obtain a solid and compact structure.
The insulating layers 28 are substantially formed by a polyimide obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine. A polyimide of this kind is marketed by the company Du Pont De Nemours under the registered trade mark Kapton and may contain conventional additives for plastics materials, as well as protective films. The insulating layers 28 may for instance be in the form of a spiral-wound strip or a tube.
As a result of the inclusion of the three insulating layers 28, the heater of the invention satisfies the CEI EN 60335-1 specifications under which at least a double insulation is required. If the heater has to satisfy less strict specifications, only one insulating layer 28 could be provided. Vice versa, the number of insulating layers 28 could be increased to cope with particularly onerous uses.
The polyimide used as insulating material is not hygroscopic with the result that the heater does not require special closures which prevent moisture from penetrating therein, thereby greatly simplifying its structure.
The dielectric rigidity of the insulating material used is very high with the result that the electric performance of the heater is excellent.
Fig. 3 shows further possibilities for the connection of the metal conducting pins 16 to the electrodes 14 which have a cross-section shaped as a circular segment with a perimeter defined by a circumferential arc 30 and by a chord 32 (which may possibly correspond to the diameter of the circumference). The electrodes 14 have a longitudinal seat adapted to house the respective pin 16, which seat may be provided -either at the perimetral section of the electrode 14 defined by the chord 32 (see reference numeral 34a) or in the body of the electrode (see reference numeral 34b). Fig. 3 shows both constructional solutions, although it will be appreciated that one only will be used in practice, while Figs. 4 and 5 show the two solutions separately. During assembly of the heater, the pin 16 is inserted in the respective seat 34a or 34b in which it is then clamped during the above-mentioned compression stage so as to ensure electrical continuity.
According to the prior art, the pins 16 are on the contrary located in seats provided in the perimetral section of the electrode 14 defined by the circumferential arc 30. This location has the drawback that, during the compression stage, any projections, cutting edges or irregularities may damage the adjacent insulating layers 28 thereby comprising their electrical insulation properties. This drawback is remedied by locating the pins 16 according to the invention, since any contact between the seats 34a and 34b and the insulating layers 28 is prevented.
Without prejudice to the principle of the invention, its details and embodiments may obviously be widely varied with respect to those described purely by way of example, without thereby departing from the scope of the invention.

Claims

1. A cartridge heater, in particular for electric radiators, comprising an outer housing (10), at least one PTC resistor (12) disposed in the housing (10) and electrically insulating material interposed radially between the housing (10) and the at least one PTC resistor (12), said resistor being characterized in that the electrically insulating material interposed radially between the housing (10) and the at least one PTC resistor (12) consists substantially of a polyimide obtained by polycondensation of an aromatic tetrabasic acid and an aromatic diamine.
2. A heater according to claim 1, characterized in that it comprises at least one polyimide insulating layer (28) disposed coaxially about the PTC resistor.
3. A heater according to any one of the preceding claims, characterized in that it comprises a plurality of polyimide insulating layers (28) disposed coaxially about the PTC resistor.
4. A heater according to any one of the preceding claims, characterized in that said at least one polyimide insulating layer (28) is made in the form of a spiral- wound strip.
5. A heater according to any one of the preceding claims, characterized in that said at least one polyimide insulating layer (28) is made in the form of a tube.
6. A heater according to any one of the preceding claims, characterized in that the housing (10) has a tubular shape of circular section and at least one PTC resistor (12) is disposed in an inner diametrical segment of the housing (10) with a first and a second electrode (14) disposed on opposite sides of the at least one PTC resistor (12), the assembly formed by the at least one PTC resistor (12) and the electrodes (14) having a substantially cylindrical shape and being surrounded by at least one polyimide insulating layer (28).
7. A heater according to claim 6, characterized in that it comprises three polyimide insulating layers (28) disposed coaxially about one another and surrounded by said housing (10).
8. A heater according to claim 6 or 7, characterized in that it comprises a plurality of PTC resistors (12) disposed longitudinally in succession in an inner diametrical segment of said housing (10).
9. A heater according to any one of claims 6 to 8, characterized in that the first and second electrodes (14) each have a cross-section shaped as a circular segment with a perimeter defined by a circumferential arc (30) and by a chord (32) and comprise a longitudinal seat (34a, 34b) adapted to house a respective conducting pin (16), which seat is provided in the section of the perimeter of the electrode (14) defined by the chord (32) or in the body of the electrode (14).
EP07736850.4A 2007-03-13 2007-05-15 Cartridge heater Active EP2193690B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20070185 ITTO20070185A1 (en) 2007-03-13 2007-03-13 CARTRIDGE HEATER
PCT/IT2007/000347 WO2008111101A1 (en) 2007-03-13 2007-05-15 Cartridge heater

Publications (2)

Publication Number Publication Date
EP2193690A1 true EP2193690A1 (en) 2010-06-09
EP2193690B1 EP2193690B1 (en) 2014-03-26

Family

ID=38543832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07736850.4A Active EP2193690B1 (en) 2007-03-13 2007-05-15 Cartridge heater

Country Status (3)

Country Link
EP (1) EP2193690B1 (en)
IT (1) ITTO20070185A1 (en)
WO (1) WO2008111101A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011057017A1 (en) * 2011-12-23 2013-06-27 Dbk David + Baader Gmbh Heating assembly for heating e.g. ammonia in ammonia storage and delivery system for diesel engine of lorry, has coupling layer arranged in circumference gap between sleeve wall and cartridge wall for thermal and/or mechanical coupling
FR2989551B1 (en) * 2012-04-16 2015-09-04 Vernet HEAT CARTRIDGE AND THERMOSTATIC ELEMENT COMPRISING SUCH A CARTRIDGE
GB201407560D0 (en) * 2014-04-30 2014-06-11 Yorkshire Electric Radiators Ltd Improvements to radiator apparatuses
US10764963B2 (en) 2016-10-07 2020-09-01 S. C. Johnson & Son, Inc. Volatile material dispenser

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835434A (en) * 1973-06-04 1974-09-10 Sprague Electric Co Ptc resistor package
DE3730161A1 (en) * 1987-09-09 1989-03-30 Braun Ag Electrical heating element
DE3815306A1 (en) * 1988-05-05 1989-11-16 Eichenauer Gmbh & Co Kg F ELECTRIC HEATING ELEMENT WITH PTC ELEMENT
ES2099767T3 (en) * 1992-06-11 1997-06-01 David & Baader Dbk Spezfab METHOD TO PRODUCE A HEATING RESISTANCE WITH POSITIVE TEMPERATURE COEFFICIENT.
US6455822B1 (en) * 2000-10-11 2002-09-24 Mega Dynamics Ltd. Heat sink for a PTC heating element and a PTC heating member made thereof
DE20101106U1 (en) * 2001-01-22 2001-04-05 David & Baader Dbk Gmbh Protection element in an electrical circuit
ATE357123T1 (en) 2004-11-11 2007-04-15 Dbk David & Baader Gmbh ELECTRICAL BOARD HEATING UNIT, ELECTRONIC BOARD AND HEATING METHOD
DE202006011295U1 (en) * 2006-07-22 2006-10-19 Eichenauer Heizelemente Gmbh & Co. Kg Heating device for e.g. hair curlers has extruded section, which is so designed that three side walls of hollow space protrude over solid base, formed on both sides at base shank

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008111101A1 *

Also Published As

Publication number Publication date
ITTO20070185A1 (en) 2008-09-14
WO2008111101A1 (en) 2008-09-18
EP2193690B1 (en) 2014-03-26

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