Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-07-25
2001-11-06
Yeung, James C. (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C126S09100A, C165S125000, C432S176000, C432S199000
Reexamination Certificate
active
06311685
ABSTRACT:
BACKGROUND OF THE INVENTION
The heat exchanger of the invention is of the type which surrounds a radial fan which causes the vector fluid (for example air or air and steam) to circulate and is supplied with hot gases produced by combustion of a burner.
Heat exchangers of this type are known and are constituted by a pipe, spiral-wound about the radial fan and preferably provided with internal elements which cause the fluid to spin, creating a turbulence which increases heat exchange. A burner is predisposed at one end of the pipe and is equipped with a blower to convey the hot combustion gases into the pipe. The other end of the pipe discharges directly to the environment or into a chimney flue.
Another known device, illustrated in European publication EP 0 856 705, teaches a heater constituted by a pipe, internally of which the hot gases produced by a burner flow, which pipe surrounds the fan without but not in a spiral; it is instead bent to give rise to two branches arranged side-by-side and parallel, and united by a 360° free curve. This free curve absorbs heat expansion factors, so that the points where the pipe is fixed do not suffer these effects.
The above prior art realisations, however, exhibit numerous drawbacks and limitations.
One limitation is constituted by the fact that the arrangement of the pipes around the fan does not guarantee complete and sufficiently uniform coverage of the most-ventilated zone situated peripherally about the fan. This has a negative effect on the heat exchange efficiency.
Other limitations derive from the existence of a non-eptimal thermal exchange situation internally of the pipes.
The main aim of the present invention is to obviate the above-mentioned drawbacks in the prior art.
SUMMARY OF THE INVENTION.
An advantage of the invention consists in the fact that it provides very good heat exchange efficiency, obviating the need to apply means for increasing the heat exchange which would lead to constructional complications rendering good cleaning of the device very difficult if not impossible.
A further advantage of the invention is that thanks to the efficiency of the heat exchange obtained in proximity of the fan, the vaporisition of the water (in the case of mixed ovens, with direct steam-production) occurs directly on the pipes instead of by means of additional means. This is more economical and favours uniformity of distribution of steam and temperatures internally of the cooking chamber in which the exchanger is installed.
A further advantage of the invention is that the burnier is located in a closed cage internally of the combustion chamber, which in turn is located in the cooking chamber. This arrangement is very safe because should the gas supply malfunction, or the burner itself, risk of gas escape is nil, as the gas supply circuit to the combustion chamber represents a single and completely sealed entity.
A still further advantage arises from the use of a burner of a type where the mixing of the air and the fuel is done in three successive stages, producing a very long flame which projects well into the pipe itself
These aims and advantages and others besides are all attained by the invention as it is characterised in the appended claims.
REFERENCES:
patent: 3306334 (1967-02-01), Goubsky
patent: 4648377 (1987-03-01), Van Camp
patent: 5556566 (1996-09-01), Cappello et al.
patent: 5636622 (1997-06-01), Urcelay Amondarain et al.
patent: 5915372 (1999-06-01), Wiedemann et al.
patent: 526768-A (1993-02-01), None
Bassoli Claudio
Soavi Alessandro
Angelo Po Grandi Cucine S.p.A.
Browdy and Neimark
Yeung James C.
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