US3881163A - Electrical cartridge-type heater - Google Patents

Electrical cartridge-type heater Download PDF

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Publication number
US3881163A
US3881163A US473288A US47328874A US3881163A US 3881163 A US3881163 A US 3881163A US 473288 A US473288 A US 473288A US 47328874 A US47328874 A US 47328874A US 3881163 A US3881163 A US 3881163A
Authority
US
United States
Prior art keywords
strips
core
passages
pins
terminal pins
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.)
Expired - Lifetime
Application number
US473288A
Other languages
English (en)
Inventor
Herbert L Lindroth
Carl E Barker
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.)
IND ENGINEERING AND EQUIPMENT
INDUSTRIAL ENGINEERING AND EQUIPMENT Co
Original Assignee
IND ENGINEERING AND EQUIPMENT
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 IND ENGINEERING AND EQUIPMENT filed Critical IND ENGINEERING AND EQUIPMENT
Priority to US473288A priority Critical patent/US3881163A/en
Priority to DE19742443861 priority patent/DE2443861A1/de
Priority to JP4289675A priority patent/JPS5332895B2/ja
Application granted granted Critical
Publication of US3881163A publication Critical patent/US3881163A/en
Priority to FR7515794A priority patent/FR2273437B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing
    • Y10T29/49098—Applying terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y10T29/49917—Overedge assembling of seated part by necking in cup or tube wall
    • Y10T29/49918—At cup or tube end

Definitions

  • ABSTRACT An electrical cartridge-type heater has a metal sheath containing a heating coil embedded in an insulating core. Connections between the coil and terminal pins are made by means of flat conductor strips which are wound around the pins and compressed by surrounding insulation.
  • An improved method for securing the connector strips to the embedded portions of the terminal pins comprises twisting the strips about their longitudinal axes, inserting the twisted strips in preformed passages in the core member, pressing the terminal pins into the passages against the spiral surfaces of the twisted strips, to cause the strips to become entwined around the pins, installing the core assembly in a metal sheath, and then swaging the assembled unit.
  • the present invention relates to electrical cartridgetype heaters, and methods of manufacturing thesame.
  • a failure of many cartridge heaters is the result of faulty connections between the heater coil and the terminal pins.
  • a high resistance junction and in some instances internal arcing may occur.
  • the conditions is particularly manifest in heaters wherein the coil ends extend along the terminal pins in the surrounding insulating core and which, at best make only linear contact with the pins. Contact and conductance may be further diminished by the entry of powdered insulating core material between the confronting conductors. Such poor connections often result in excessively high internal temperatures that cause early failure of the heater.
  • the principal object of the present invention is to provide improved means and a method for producing a positive surface-tosurface, low resistance electrical connection between the heat coil and terminal pins, inside the ceramic core of the heater unit, and to accomplish the same by a simple procedure and means that do not materially increase manufacturing costs.
  • connections between ends of the heater coil and terminal pins are made with the use of short strips of conductor ribbon.
  • the connector strips are initially twisted, then inserted into restricted passages in a ceramic core body upon which the heater coil is wound. Ends of the strips are secured to the coil ends outside the core, and terminal pins are then inserted into the passages against the twisted surfaces of the strips to cause the strips to become tightly entwined around the pins. Thereafter the core assembly is installed in a tubular metal sheath and the unit is laterally compressed by swaging.
  • FIG. 1 of the drawings is a plan view of a preformed connector strip
  • FIG. 2 is a plan view, partly in section, illustrating the core assembly with connector strips in place, prior to installation of terminal pins;
  • FIG. 3 is a longitudinal sectional view of the heater assembly with all parts in place but prior to a swaging and trimming operation;
  • FIG. 4 is a longitudinal sectional view through the unit following swaging and trimming
  • FIG. 5 is a transverse sectional view taken at line 5-5 of FIG. 3.
  • the cartridge heater of the present invention comprises a tubular metal casing 6 containing a cylindrical core member 7 formed of a compacted body of refractory insulating material, such as magnesium oxide.
  • a helical coil 8 of resistance wire, wound on core 7 is embedded in a layer 9 of refractory material that surrounds the core assembly and insulates the coil from the casing.
  • a pair of terminal pins 10 extend longitudinally through core 7 and are connected each to one end of the coil 8 by elements 11 formed of flat wire ribbon. These connector elements are entwined around the pins and are held in intimate surface contact therewith within the compacted core 7.
  • Pins 10 project outwardly from one end of the unit, extending through a closure plug 12 at that end, and at the opposite end of the unit the pins abut an insulating disc that separates the pins from a metal closure disc 14 which is welded to the casing wall.
  • Curciform elements 15, FIG. 5 are formed of refractory material and are primarily employed to support the core assembly centrally within the casing during the assembly process, as will be explained.
  • the preformed core member 7 is provided with a pair of parallel passages 15 for receiving the terminal pins, and also with lateral recesses 17 at opposite ends of the core, each recess communicating with one of the passages.
  • Passages 16 are slightly larger in diameter than that of the terminal pins, but desirably such that the passage diameter does not exceed the pin diameter by more than twice the thickness of the ribbon from which the connector elements 11 are made.
  • the coil 8 is wound on the core so that a number of the end turns 8a thereof extend across the passages 15 at the recesses 17.
  • the connector elements 11 are simply formed from short strips of conductor ribbon by twisting the strips about their longitudinal axes one or more full turns, and bending an end portion of each twisted strip to form a crook 110, as shown in FIG. 1.
  • the twisted elements 11 are inserted into the core passages 15, one from one end of the core member and the other from the opposite end, and the transversely bent end portions 11a of the elements are hooked over end turns of the coil and clamped thereto.
  • the terminal pins With the twisted strips held in place as described the terminal pins are slid into the passages against the spiral surfaces of the elements 18, the effect of which is to cause the elements to entwine around and come into surface contact, as distinguished from linear contact, with the pins.
  • the cruciform spacer elements 15 are threaded on the pins, one at each end, and the assembly is inserted into the casing containing the insulating disc 13 resting upon the inner surface of the metal closure disc 14. At this stage of the assembly process the elements 15 serve to support core assembly coaxially within the casing, with the coil 8 narrowly spaced therefrom.
  • the interior space surrounding the core assembly is then packed with powdered magnesium oxide or the equivalent.
  • powdered magnesium oxide or the equivalent is introduced into the open end of the casing, and, while the assembly is being vibrated, caused to pass through the marginal openings in spacer discs 15 to fill completely all voids in the casing.
  • the lava closure plug 12 threaded on the terminal pins, is pressed into place against spacer disc 15, and a temporary plug 20 (FIG.3), of plastic, is installed in similar manner within the open end of the casing and against the plug 12.
  • the assembled unit is subjected to lateral compaction, as by swaging, which has the effect of crushing the core member 7, pressing the material thereof tightly against the pins and connector strips 11 and binding all parts together into a solid unit.
  • the casing is severed in the plane of the outer face of the plug 12 and the excess casing portion with temporary plug removed.
  • the extreme end of the tubular casing may be turned inwardly over the outer edge of plug 12 to secure and seal that member in place.
  • An electrical heating unit comprising:
  • d. means interconnecting the ends of said resistor coil each to one of said terminal pins, comprising strips of flat, longitudinally twisted metallic ribbon extending longitudinally in said core passages and making surface to surface contact with said terminal pins.
  • said metallic ribbon connector strips extend spirally around said pins and are held in intimate surface contact with said pins by said insulating material of the core.
  • said strips have U-shaped end portions clamped to opposite end portions of the resistor coil.
  • An electrical cartridge heater including:
  • said core is provided with lateral recesses at opposite ends thereof, each recess communicating with one of said passages, and
  • said strips have reveresely bend end portions located within said recesses in clamping engagement with the portions of the resistor coil that traverse said recesses.
  • terminal pins are comprised of slender metallic rods of diameter to fit loosely within the core passages.
  • terminal pins are inserted into the core passages from the same ends thereof in which said twisted metal strips are inserted.
  • said core member is formed to provide lateral recesses each communicating with one of the core passages, and i f. a connection between the twisted strips and the resistor coil is made by clamping end portions of the strips to end turns of the resistor coil at said lateral COI'C recess. 4 5

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  • Resistance Heating (AREA)
US473288A 1974-05-28 1974-05-28 Electrical cartridge-type heater Expired - Lifetime US3881163A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US473288A US3881163A (en) 1974-05-28 1974-05-28 Electrical cartridge-type heater
DE19742443861 DE2443861A1 (de) 1974-05-28 1974-09-13 Elektrischer heizkoerper
JP4289675A JPS5332895B2 (enrdf_load_html_response) 1974-05-28 1975-04-10
FR7515794A FR2273437B1 (enrdf_load_html_response) 1974-05-28 1975-05-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US473288A US3881163A (en) 1974-05-28 1974-05-28 Electrical cartridge-type heater

Publications (1)

Publication Number Publication Date
US3881163A true US3881163A (en) 1975-04-29

Family

ID=23878943

Family Applications (1)

Application Number Title Priority Date Filing Date
US473288A Expired - Lifetime US3881163A (en) 1974-05-28 1974-05-28 Electrical cartridge-type heater

Country Status (4)

Country Link
US (1) US3881163A (enrdf_load_html_response)
JP (1) JPS5332895B2 (enrdf_load_html_response)
DE (1) DE2443861A1 (enrdf_load_html_response)
FR (1) FR2273437B1 (enrdf_load_html_response)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114244A (en) * 1976-04-03 1978-09-19 Rudolf Klaschka Method for mounting of electrical components, in particular electrolyte capacitors
US4155063A (en) * 1977-07-25 1979-05-15 Aloysius J. Kochanski Temperature sensor means
US4331914A (en) * 1980-08-27 1982-05-25 General Electric Company Load control and switching circuits
DE3807106A1 (de) * 1988-03-04 1989-09-14 Schlafhorst & Co W Kodierung von spulenhuelsen
US5247158A (en) * 1992-07-17 1993-09-21 Watlow Electric Manufacturing Company Electrical heater
US5486682A (en) * 1992-10-21 1996-01-23 Acra Electric Corporation Heater assembly for swaged cartridge heater and method of manufacture
US6396033B1 (en) * 2001-05-11 2002-05-28 Fast Heat, Inc. Sump heater for air conditioning compressor
US6486442B2 (en) * 2000-10-12 2002-11-26 Hotset Corporation Heating device with electric heating element and thermocouple
US20040226938A1 (en) * 2003-02-26 2004-11-18 Nippon Thermostat Co., Ltd. Block heater
US20080290085A1 (en) * 2007-05-22 2008-11-27 Schlipf Andreas Heating cartridge with coupling element
US20090032519A1 (en) * 2007-08-03 2009-02-05 Schlipf Andreas Electric cartridge type heater
US20100156589A1 (en) * 2008-12-23 2010-06-24 Ty-Ohm Electronic Works Co., Ltd. Resistor and method for making a resistor
EP2418659A3 (de) * 2010-08-11 2012-08-29 DBK David + Baader GmbH Bremswiderstand
US8466767B2 (en) 2011-07-20 2013-06-18 Honeywell International Inc. Electromagnetic coil assemblies having tapered crimp joints and methods for the production thereof
US8572838B2 (en) 2011-03-02 2013-11-05 Honeywell International Inc. Methods for fabricating high temperature electromagnetic coil assemblies
US8754735B2 (en) 2012-04-30 2014-06-17 Honeywell International Inc. High temperature electromagnetic coil assemblies including braided lead wires and methods for the fabrication thereof
US8860541B2 (en) 2011-10-18 2014-10-14 Honeywell International Inc. Electromagnetic coil assemblies having braided lead wires and methods for the manufacture thereof
US20140312028A1 (en) * 2013-04-19 2014-10-23 Chromalox, Inc. Medium voltage heater elements moisture detection circuit
US9027228B2 (en) 2012-11-29 2015-05-12 Honeywell International Inc. Method for manufacturing electromagnetic coil assemblies
US9076581B2 (en) 2012-04-30 2015-07-07 Honeywell International Inc. Method for manufacturing high temperature electromagnetic coil assemblies including brazed braided lead wires
US20170071033A1 (en) * 2015-09-04 2017-03-09 Türk & Hillinger GmbH Heating device for fluids and method for manufacturing such a heating device
US9722464B2 (en) 2013-03-13 2017-08-01 Honeywell International Inc. Gas turbine engine actuation systems including high temperature actuators and methods for the manufacture thereof
US10743374B2 (en) * 2015-07-30 2020-08-11 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Armored resistor and manufacturing process thereof
US20210298131A1 (en) * 2020-03-04 2021-09-23 Türk & Hillinger GmbH Electric heater

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5753437Y2 (enrdf_load_html_response) * 1977-05-09 1982-11-19
JPS53138531A (en) * 1977-05-09 1978-12-04 Hitachi Heating Appliance Co Ltd Preparation of cartridge heater
JPH02133888U (enrdf_load_html_response) * 1989-04-07 1990-11-07
JPH04272685A (ja) * 1991-02-26 1992-09-29 Sakaguchi Dennetsu Kk シ−ズヒ−タ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310769A (en) * 1964-06-16 1967-03-21 Rama Corp Cartridge heater
US3812580A (en) * 1970-02-06 1974-05-28 Emerson Electric Co Method of making electric heating elements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310769A (en) * 1964-06-16 1967-03-21 Rama Corp Cartridge heater
US3812580A (en) * 1970-02-06 1974-05-28 Emerson Electric Co Method of making electric heating elements

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114244A (en) * 1976-04-03 1978-09-19 Rudolf Klaschka Method for mounting of electrical components, in particular electrolyte capacitors
US4155063A (en) * 1977-07-25 1979-05-15 Aloysius J. Kochanski Temperature sensor means
US4331914A (en) * 1980-08-27 1982-05-25 General Electric Company Load control and switching circuits
DE3807106A1 (de) * 1988-03-04 1989-09-14 Schlafhorst & Co W Kodierung von spulenhuelsen
US5247158A (en) * 1992-07-17 1993-09-21 Watlow Electric Manufacturing Company Electrical heater
US5486682A (en) * 1992-10-21 1996-01-23 Acra Electric Corporation Heater assembly for swaged cartridge heater and method of manufacture
US6486442B2 (en) * 2000-10-12 2002-11-26 Hotset Corporation Heating device with electric heating element and thermocouple
US6396033B1 (en) * 2001-05-11 2002-05-28 Fast Heat, Inc. Sump heater for air conditioning compressor
US20040226938A1 (en) * 2003-02-26 2004-11-18 Nippon Thermostat Co., Ltd. Block heater
US8426780B2 (en) * 2007-05-22 2013-04-23 Türk & Hillinger GmbH Heating cartridge with coupling element
US20080290085A1 (en) * 2007-05-22 2008-11-27 Schlipf Andreas Heating cartridge with coupling element
US8022339B2 (en) * 2007-08-03 2011-09-20 Türk + Hillinger GmbH Electric cartridge type heater
US20090032519A1 (en) * 2007-08-03 2009-02-05 Schlipf Andreas Electric cartridge type heater
US20100156589A1 (en) * 2008-12-23 2010-06-24 Ty-Ohm Electronic Works Co., Ltd. Resistor and method for making a resistor
EP2418659A3 (de) * 2010-08-11 2012-08-29 DBK David + Baader GmbH Bremswiderstand
US8572838B2 (en) 2011-03-02 2013-11-05 Honeywell International Inc. Methods for fabricating high temperature electromagnetic coil assemblies
US9508486B2 (en) 2011-03-02 2016-11-29 Honeywell International Inc. High temperature electromagnetic coil assemblies
US8466767B2 (en) 2011-07-20 2013-06-18 Honeywell International Inc. Electromagnetic coil assemblies having tapered crimp joints and methods for the production thereof
US8860541B2 (en) 2011-10-18 2014-10-14 Honeywell International Inc. Electromagnetic coil assemblies having braided lead wires and methods for the manufacture thereof
US9076581B2 (en) 2012-04-30 2015-07-07 Honeywell International Inc. Method for manufacturing high temperature electromagnetic coil assemblies including brazed braided lead wires
US8754735B2 (en) 2012-04-30 2014-06-17 Honeywell International Inc. High temperature electromagnetic coil assemblies including braided lead wires and methods for the fabrication thereof
US9027228B2 (en) 2012-11-29 2015-05-12 Honeywell International Inc. Method for manufacturing electromagnetic coil assemblies
US9653199B2 (en) 2012-11-29 2017-05-16 Honeywell International Inc. Electromagnetic coil assemblies having braided lead wires and/or braided sleeves
US9722464B2 (en) 2013-03-13 2017-08-01 Honeywell International Inc. Gas turbine engine actuation systems including high temperature actuators and methods for the manufacture thereof
US20140312028A1 (en) * 2013-04-19 2014-10-23 Chromalox, Inc. Medium voltage heater elements moisture detection circuit
US10117292B2 (en) * 2013-04-19 2018-10-30 Chromalox, Inc. Medium voltage heater elements moisture detection circuit
US10743374B2 (en) * 2015-07-30 2020-08-11 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Armored resistor and manufacturing process thereof
US20170071033A1 (en) * 2015-09-04 2017-03-09 Türk & Hillinger GmbH Heating device for fluids and method for manufacturing such a heating device
US20210298131A1 (en) * 2020-03-04 2021-09-23 Türk & Hillinger GmbH Electric heater
US12402214B2 (en) * 2020-03-04 2025-08-26 Türk & Hillinger GmbH Electric heater

Also Published As

Publication number Publication date
JPS50153331A (enrdf_load_html_response) 1975-12-10
FR2273437B1 (enrdf_load_html_response) 1979-08-24
DE2443861A1 (de) 1975-12-18
FR2273437A1 (enrdf_load_html_response) 1975-12-26
JPS5332895B2 (enrdf_load_html_response) 1978-09-11

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