Electric heating – Heating devices – With heating unit structure
Patent
1995-04-28
1997-10-21
Walberg, Teresa J.
Electric heating
Heating devices
With heating unit structure
219544, 338210, 338212, H05B 308, H01C 306
Patent
active
056792760
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an oil burner nozzle assembly and a foil conductor assembly for providing a heater connection.
It has already been proposed to dispose electrical components required for the operation of an oil burner into an interior of a nozzle assembly. Particulary in those cases where required conductors are disposed in the interior of the nozzle assembly having installation parameters of an existing plant, a size reduction of the electrical components, including conductors and contacts is essential. Furthermore it is known (for example from the DE-PS 29 19 763) to provide oil preheaters arranged within the nozzle assembly with PTC-heating elements. In this case two PTC wafers exhibiting two contacting areas are electrically contacted by soldered wires or imposed contacting films and then embedded into an electrically insulating foil and insulating substance, respectively. These known solutions require considerably high expenditures in manual assembly which makes assembly errors inevitable. Moreover, with that kind of contacting arrangement a plurality of electrical connections exist being susceptible to interference.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an oil burner nozzle assembly including electrical components which obviates the disadvantages of the state of art and at the same time permits production at low expenditures for assembly.
The advantages of the present invention are to be found in a considerable reduction of expenditures for assembly due to the direct contacting of the electrical components in the nozzle assembly, particularly of the PTC-heating elements provided at the pre-heater, by virtue of a conducting foil which exhibits non-insulated conductive areas and definedly positioned soldering terminals.
Assembling errors are substantially eliminated due to a considerable reduction of the assembling operations. Additionally, the reduction of electrical connections subject to interferences enhances the operational safety. The invention permits a compact installation of the electrical contacting units required, at the same time additional special electric insulation measures are obviated, particularly for the PTC-heating elements. A neat wiring of the units is obtained and testing of the electrical units before final assembly is facilitated.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in more detail by virtue of the schematical views of the following embodiments. In the drawings
FIG. 1 shows a lateral cross-sectional view of a PTC-heating element inserted into a conducting foil assembly provided with non-insulated conductive areas,
FIG. 2 is a plan view of the conducting foil assembly of FIG. 1 unfolded,
FIG. 3 is an unfolded conducting foil assembly adapted to receive two PTC-heating elements and to provide connections for further electrical units, and
FIG. 4 is a perspective view of the conducting foil assembly of FIG. 1 and a PTC-heating element; and
FIG. 5 is a perspective view of the conducting foil assembly of FIG. 3 and PTC-heating elements.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. 1 and 2, a PTC-heating element 1 is shown contacted by a conducting foil assembly 3 having non-insulated conducting areas 2. The conducting foil assembly 3 is dimensioned and folded so that the PTC-heating element 1 is, via its side faces, or at least via its contact faces 27, entirely enveloped as shown in FIG. 4 and, additionally, electrically insulated by electrical insulation sheets 28 acting as a conducting foil base material. The conductive paths 25 on the conducting foil assembly 3, shown in dashed lines in FIGS. 2 and 3, are provided with the electrical insulation sheets 28 on both sides with exception of the areas of the soldering terminals 30 and non-insulated conducting areas 2.
FIG. 2 shows the conducting foil assembly 3 of FIG. 1 unfolded, exposing the electrical non-insulated conducting areas 2 which meet the contact faces 27 of the PTC-heating element 1 in the folded state.
REFERENCES:
patent: 4354822 (1982-10-01), Madsen et al.
patent: 4447706 (1984-05-01), Eder et al.
patent: 4789850 (1988-12-01), Sepso et al.
patent: 4861966 (1989-08-01), Matthiesen et al.
patent: 5212466 (1993-05-01), Yamada et al.
patent: 5241741 (1993-09-01), Sugaya
Benavides Rafael
Doehla Werner
Steeb Walter
Paik Sam
Rapa Rausch & Pausch Elektrotechnische Spezialfabrik GmbH
Walberg Teresa J.
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