EP 0009136 A3 19800416 - OIL PREHEATING DEVICE
Title (en)
OIL PREHEATING DEVICE
Publication
Application
Priority
DE 2840242 A 19780915
Abstract (en)
[origin: US4371778A] A heating device for preheating heating oil flowing through a pipe has a heat conduction body to which a plate-shaped ceramic PTC resistance heating element is connected in heat exchange-relationship. The heating element has a thickness in the range of 0.5 to 2 millimeters, a Curie temperature between 120 DEG and 220 DEG C. and a specific resistance of 430 to 5000 ohm-cm rated at a supply voltage between 110 and 220 volts such that the maximum temperature achieved by the heating element over a range of heat transfer rates is relatively constant and is determined by the resistivity and the Curie temperature of the heating element rather than by the rate of heat transfer. If designed for energization at 220 volts, the heating element has the same thickness and Curie temperature as in the first example described above, but with a specific resistance of 1700 to 20,000 ohm-cm as measured at 220 volts.
IPC 1-7
IPC 8 full level
F23D 11/44 (2006.01); F23K 5/00 (2006.01); F23K 5/20 (2006.01); H05B 3/12 (2006.01); H05B 3/14 (2006.01)
CPC (source: EP US)
F23K 5/20 (2013.01 - EP US); H05B 3/141 (2013.01 - EP US)
Citation (search report)
- [P] FR 2404983 A1 19790427 - SIEMENS AG [DE], et al
- [D] DE 7804316 U1 19781102
- [D] DE 7811098 U1 19780824
- US 3564199 A 19710216 - BLAHA ROBERT F
- DE 2809449 A1 19780914 - TDK ELECTRONICS CO LTD
- [A] DE 2634932 A1 19770210 - RAYCHEM CORP
- [A] DE 2410999 A1 19740912 - NGK INSULATORS LTD
- [A] DE 1501687 A1 19691030 - WEISHAUPT MAX GMBH
- [A] FR 1194619 A 19591110
- [A] US 3501619 A 19700317 - BUITING FRANCIS P, et al
- [A] CH 375068 A 19640215 - SIEMENS AG [DE]
Designated contracting state (EPC)
AT CH FR GB IT NL SE
DOCDB simple family (publication)
EP 0009136 A2 19800402; EP 0009136 A3 19800416; EP 0009136 B1 19830420; AT E3132 T1 19830515; DE 2840242 A1 19800327; DE 2840242 C2 19840823; DK 385279 A 19800316; JP S5541400 A 19800324; US 4371778 A 19830201
DOCDB simple family (application)
EP 79103136 A 19790824; AT 79103136 T 19790824; DE 2840242 A 19780915; DK 385279 A 19790914; JP 11920379 A 19790917; US 7228579 A 19790904