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GB2007478A - Heating devices - Google Patents

Heating devices

Info

Publication number
GB2007478A
GB2007478A GB7838439A GB7838439A GB2007478A GB 2007478 A GB2007478 A GB 2007478A GB 7838439 A GB7838439 A GB 7838439A GB 7838439 A GB7838439 A GB 7838439A GB 2007478 A GB2007478 A GB 2007478A
Authority
GB
United Kingdom
Prior art keywords
heating element
ohms
recess
range
curie temperature
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
GB7838439A
Other versions
GB2007478B (en
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.)
Siemens Corp
Original Assignee
Siemens Corp
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
Priority claimed from DE19777730201U external-priority patent/DE7730201U1/en
Priority claimed from DE2743880A external-priority patent/DE2743880C3/en
Application filed by Siemens Corp filed Critical Siemens Corp
Publication of GB2007478A publication Critical patent/GB2007478A/en
Application granted granted Critical
Publication of GB2007478B publication Critical patent/GB2007478B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/121—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using electric energy supply
    • 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
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

A heating device for use in domestic appliances such as egg boilers and coffee percolators, comprises a plate- like P.T.C, resistance heating element 2 adapted for operation at a mains voltage of 220 V with equal heat discharge from each side of the heating element wherein, in order to emit in operation a heat power of more than 50 watts per square centimetre of the surface of said element, the element has a thickness in the range of from 0.5 to 2 mm, and said P.T.C. material has a resistivity at its Curie temperature and at an electrical field strength of 2000 volts/cm in the range of from 10<3> ohms.cm to 6.10<3> ohms. cm. The Curie temperature is at least 50 DEG K higher than the maximum normal operating temperature of the medium being heated. As shown, the element 2 is contained in a recess of a metal container body 1, the recess being closed by a metal plug 11 which is a push fit or a screw fit therein. Thermally conductive insulating layers 212, 222 cover the forces of the element 2 and ductile metal layers 412, 422 even out the pressure exerted on the element 2. A similar P.T.C. plate heating element may be sandwiched between the opposed flat surfaces of two fluid flow chambers of a coffee percolator. <IMAGE>
GB7838439A 1977-09-29 1978-09-28 Heating devices Expired GB2007478B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19777730201U DE7730201U1 (en) 1977-09-29 1977-09-29 HEATING DEVICE FOR FLOW HEATERS
DE7730233 1977-09-29
DE2743880A DE2743880C3 (en) 1977-09-29 1977-09-29 Heating device with an optimized heating element made from PTC thermistor material

Publications (2)

Publication Number Publication Date
GB2007478A true GB2007478A (en) 1979-05-16
GB2007478B GB2007478B (en) 1982-05-26

Family

ID=27187335

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7838439A Expired GB2007478B (en) 1977-09-29 1978-09-28 Heating devices

Country Status (1)

Country Link
GB (1) GB2007478B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547659A (en) * 1979-08-17 1985-10-15 Raychem Corporation PTC Heater assembly
US4673801A (en) * 1979-08-17 1987-06-16 Raychem Corporation PTC heater assembly
US4888467A (en) * 1987-07-11 1989-12-19 Robert Krups Stiftung & Co., Kg. Machine for making coffee and other hot beverages
GB2391151A (en) * 2002-02-28 2004-01-28 Triton Plc Compact water heater device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425497A (en) 1979-08-17 1984-01-10 Raychem Corporation PTC Heater assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547659A (en) * 1979-08-17 1985-10-15 Raychem Corporation PTC Heater assembly
US4673801A (en) * 1979-08-17 1987-06-16 Raychem Corporation PTC heater assembly
US4888467A (en) * 1987-07-11 1989-12-19 Robert Krups Stiftung & Co., Kg. Machine for making coffee and other hot beverages
GB2391151A (en) * 2002-02-28 2004-01-28 Triton Plc Compact water heater device

Also Published As

Publication number Publication date
GB2007478B (en) 1982-05-26

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee