Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1997-02-18
1999-12-14
Hoang, Tu Ba
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219385, F27D 1100
Patent
active
06002111&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the general technical field of apparatus for heating or cooking foodstuffs conceived in particular for deep-frying in oil.
The present invention concerns an apparatus for heating foodstuffs, in particular for deep-frying in oil, comprising a removably mounted bowl surrounded by a spaced thermal skirt, as well as heating means disposed beneath the bowl and associated with heating control means.
The present invention concerns more particularly, but not exclusively, an electric fryer intended for cooking foodstuffs such as french fries, meat or fish.
PRIOR ART
It has already been proposed, for example in French Patent FR-A1 510 977 to create electric fryers comprising a removable metallic bowl mounted to be supported by its upper peripheral edge on a thermal skirt forming the external part of the fryer. According to this form of construction, heating means are constituted by a sheathed spiral resistance fixed on the base of the fryer and associated with an assembly of thermal reflectors. The fryer is constructed so that in the position where it is supported on the thermal skirt, the bowl is maintained at a distance from the heating means which thus assures a heating by radiation.
Such an apparatus benefits quite obviously from the advantages connected with the removability of the bowl such as the ease of cleaning and of handling, but suffers from inconveniences connected with the very design of the apparatus. Thus, it has been found that the general thermal performance of the apparatus is not satisfactory because a large part of the thermal energy is lost or dissipated in directions other than those of the bowl. There follow a series of localized heatings in useless zones. Moreover, the absence of a complete thermal mastery significantly disturbs the operation of the thermal control means, to the extent that they are subjected to a series of diverse thermal influences that disturb the real thermal image of the bowl.
In order to obviate a part of the problems mentioned previously, it has already been proposed in patent application EP-A-0 587 300 to construct an electric fryer in which the heating means are fixed to rest on the removable bowl. In this patent application, the heating means are constituted by a sheathed resistance crimped or soldered on the external face of the bottom of the removal bowl. The solution selected in this patent application permits conserving the fundamental advantages of fryers equipped with a removal bowl, while benefiting from a good thermal transmission between the heating means and the removable bowl. In return, the solution chosen requires the development of a system for electrical connection between the terminals of the sheathed resistance and the fixed body of the fryer. Such a connection system, in addition to the fact that it constitutes a limitation with regard to fabrication and a supplemental cost for the apparatus, is susceptible following a series of manipulations of the removable bowl to no longer perform its connection function perfectly. Finally, the presence of sheathed heating elements on the removable bowl destined to undergo a series of repeated washings risks progressive deterioration of the sheathed elements and accelerates their wear. It is equally not excluded that water can penetrate to the very interior of the sheathed elements by way of microcracks.
It has certainly already been envisioned, notably in utility model GM-90 17 621 9 or in the application EP-0560431, these two documents being of the same applicant and relating to the same appliance, to produce electric fryers whose heating means is fixed on the body of the appliance at a distance from the bottom of the removable bowl. To improve the thermal effectiveness of this heating mode it has been envisioned to mount between the thermal skirt and the walls of the bowl a simple vertical screen forming a reflector, surrounding only the lateral and vertical walls of the bowl. The arrangement chosen implies nevertheless the use of heating means of the hal
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Beugnot Bernard
Bizard Jean-Claude
Thevenin Jean-Marie
Campbell Thor
Hoang Tu Ba
Seb S.A.
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