EP0300132A1 - Dispositif de chauffage à thermistance - Google Patents

Dispositif de chauffage à thermistance Download PDF

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Publication number
EP0300132A1
EP0300132A1 EP88104323A EP88104323A EP0300132A1 EP 0300132 A1 EP0300132 A1 EP 0300132A1 EP 88104323 A EP88104323 A EP 88104323A EP 88104323 A EP88104323 A EP 88104323A EP 0300132 A1 EP0300132 A1 EP 0300132A1
Authority
EP
European Patent Office
Prior art keywords
thermistor
contact
heating device
fact
metal
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Withdrawn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
EP88104323A
Other languages
German (de)
English (en)
Inventor
Paolo Gualandi
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.)
GUABER SpA
Original Assignee
GUABER 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 GUABER SpA filed Critical GUABER SpA
Publication of EP0300132A1 publication Critical patent/EP0300132A1/fr
Withdrawn legal-status Critical Current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—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating 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—Heating 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

Definitions

  • the present invention refers to a thermistor heating device, particularly for heating tablets emanating evaporating insecticide substances and/or deodorants.
  • Heating devices for the already-mentioned use amongst which can be included devices using a thermistor element seated in a special ceramic case closed by a metallic heat-emanating plate are generally known.
  • both of the opposite upper and lower faces of the thermistor that are bound to contact the metal strips connecting to an external source of electrical energy are conveniently metal-plated to guarantee that electric contact is adequate.
  • Layers of insulated material are then interposed between the metal-plated surface for the upper contact strip and the metallic heat-emanating plate so as to adequately insulate the latter from the heating thermistor.
  • the object of this invention is to provide a thermistor heating device of the type mentioned above, that is capable of satisfying as much as possible the two stated exigencies, that is to say, to guarantee contemporaneously the conduction of a high degree of heat from the thermistor to the metallic radiating plate, and an increased electric insulation whose safeness is far superior to other known devices.
  • Another object of the present invention is to provide a thermistor heating device, of the type mentioned, in which the electric contacts are kept notably spaced apart from the metallic surface of the radiating plate which, in this manner, is not subjected to direct voltage even if it can accidentally come into contact with the hands of the utilizer when the apparatus or the heating device is under tension.
  • a further object of the present invention is to provide a thermistor heating device, as defined above, that can be easily assembled and that offers the maximum safety.
  • a thermistor heating device comprising a ceramic case member having a seat for the thermistor closed by a metallic radiating plate, and contact strips protruding from openings through the above-mentioned case member, each of said strips being kept in contact with a corresponding metal-plated portion of the thermistor surface, characterised by the fact that said metal-plated surfaces of the thermistor for the contact strips positioned on a same side of the thermistor facing towards the ceramic case, and by th fact that there is at least on layer of insulating material interposed between said thermistor and the above-mentioned metallic plate.
  • the heating device comprises a case member 10, in ceramic material, having a bottom wall 11 and lateral walls 12 defining a cavity or seating 14 for a thermistor 15.
  • the thermistor 15, on the side facing towards the bottom wall 11 of the ceramic case 10 has two superficial areas 16 and 17 duly metal-plated, positioned at suitable distance one from the other against which are made to rest respective electric contact strips 18 and 19 to connect the device with an external source of electric power.
  • each contact strip 18 and 19 comprises an internal part 20 defining a C-shaped spring means suitable to fit between the bottom wall 11 of the ceramic case 10 and the bottom surface of the thermistor 15, and a stem portion 21 protruding from a corresponding opening 22 in the bottom wall 11 of the ceramic case 10.
  • the device is completed by one or more sheets 23 of electrically insulating material, for example, in micarta and/or nylon, placed above the seating 14 for the thermistor that adequately insulate the metallic radiating plate 24, on which is normally placed a tablet 25 comprising an insecticidal substance or deodorant for evaporation.
  • the radiating plate 24 also serves to assemble the various parts of the device; in this respect plate 24 comprises four lateral legs 26 which are positioned in contact with and in respective seats outside two parallel walls 12 of the ceramic case 10 and whose extremities 26a are folded and pressed externally against the bottom wall 11 of the ceramic case 10.
  • the particular disposition of the contact strips and of the respective metal-plated surfaces of the thermistor allows for maximum security in that between the metallic radiating plate 24, on the one side, and the electric contacts 18, 19, on the opposite side, are placed not only the insulating sheets 23, but also the entire thickness of the thermistore's body 15, that can reach and exceed 4 mm, obtaining in this manner insulation tension values that can exceed 5.000 volts at 3 micro A, unthinkable and unattainable in the traditional devices in which both faces of the thermistor are metal-plated. Consequently, even in cases of perforation or of total destruction of the insulating layers 23, the radiating plate 24 will never be subjected directly to high voltage in that said voltage will be reduced in proportion to the thickness of the thermistor body.

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  • Catching Or Destruction (AREA)
EP88104323A 1987-06-30 1988-03-18 Dispositif de chauffage à thermistance Withdrawn EP0300132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21110/87A IT1205215B (it) 1987-06-30 1987-06-30 Dispositivo riscaldante a termistore
IT2111087 1987-06-30

Publications (1)

Publication Number Publication Date
EP0300132A1 true EP0300132A1 (fr) 1989-01-25

Family

ID=11176890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104323A Withdrawn EP0300132A1 (fr) 1987-06-30 1988-03-18 Dispositif de chauffage à thermistance

Country Status (2)

Country Link
EP (1) EP0300132A1 (fr)
IT (1) IT1205215B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101656171B (zh) * 2008-08-21 2013-11-20 贵州航天电器股份有限公司 一种新型风速继电器
US8872075B2 (en) 2008-12-05 2014-10-28 Hyundai Motor Company Positive temperature coefficient (PTC) rod assembly
US8895898B2 (en) 2008-12-05 2014-11-25 Hyundai Motor Company Positive temperature coefficient (PTC) rod assembly and PTC heater using the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598961A (en) * 1969-09-29 1971-08-10 Armstrong Cork Co Metallic container with an integral split-electrode series-laminated heater
FR2350032A1 (fr) * 1976-04-30 1977-11-25 Murata Manufacturing Co Dispositif chauffant a semiconducteur a coefficient de temperature positif
FR2431256A3 (fr) * 1978-07-22 1980-02-15 Globol Werk Ensemble comprenant une plaque chauffante electrique montee dans un dispositif evaporateur d'insecticides ou analogues
EP0019376A1 (fr) * 1979-04-28 1980-11-26 Murata Manufacturing Co., Ltd. Appareil de chauffage employant un thermistor
US4574187A (en) * 1980-08-29 1986-03-04 Sprague Electric Company Self regulating PTCR heater
GB2181629A (en) * 1985-09-27 1987-04-23 Tdk Corp Ptc heating device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598961A (en) * 1969-09-29 1971-08-10 Armstrong Cork Co Metallic container with an integral split-electrode series-laminated heater
FR2350032A1 (fr) * 1976-04-30 1977-11-25 Murata Manufacturing Co Dispositif chauffant a semiconducteur a coefficient de temperature positif
FR2431256A3 (fr) * 1978-07-22 1980-02-15 Globol Werk Ensemble comprenant une plaque chauffante electrique montee dans un dispositif evaporateur d'insecticides ou analogues
EP0019376A1 (fr) * 1979-04-28 1980-11-26 Murata Manufacturing Co., Ltd. Appareil de chauffage employant un thermistor
US4574187A (en) * 1980-08-29 1986-03-04 Sprague Electric Company Self regulating PTCR heater
GB2181629A (en) * 1985-09-27 1987-04-23 Tdk Corp Ptc heating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101656171B (zh) * 2008-08-21 2013-11-20 贵州航天电器股份有限公司 一种新型风速继电器
US8872075B2 (en) 2008-12-05 2014-10-28 Hyundai Motor Company Positive temperature coefficient (PTC) rod assembly
US8895898B2 (en) 2008-12-05 2014-11-25 Hyundai Motor Company Positive temperature coefficient (PTC) rod assembly and PTC heater using the same

Also Published As

Publication number Publication date
IT8721110A0 (it) 1987-06-30
IT1205215B (it) 1989-03-15

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