Zanussi Grandi Impianti S.p.a.

Claudio Del Fabbro

An arrangement measures humidity in ovens, in particular fan-assisted food-cooking ovens which have a cooking cavity (8) and a separate cavity (10) that houses a cooling fan and is separated from the first cavity by a partition wall (9). The arrangement includes a body (13) made of highly heat-conductive metal, which passes through the partition wall (9) and has ends (17, 18) introduced in the cooking cavity (8) and the separate cavity (10), respectively. The arrangement also includes a heat-sink provision (19, 28, 32) connected with the end (18) of said metal body (13), and three temperature sensors (21, 22, 26) that are adapted to measure the temperatures of said two ends (17, 18) and the cooking cavity (8), respectively. These sensors are further connected with a microprocessor means (25) to supply it with information related to the temperatures they measure, so as to enable the microprocessor means (25) to determine the humidity contents of the air in the oven upon reaching the water-vapor condensation temperature at the end (17) of said metal body.

Arrangement for measuring moisture in ovens, in particular food cooking

A gas convection oven includes a blower and a heat exchanger which together produce a circulation of hot air through a cooking portion of the oven at a uniform speed and with a uniform temperature distribution. The heat exchanger includes a plurality of generally U-shaped tubes disposed outwardly of the blower and uniformly spaced apart in a symmetrical relationship concentric to the blower. Each of the tubes has a first end in open communication with a first collector chamber in which hot combustion gases are generated by a gas burner and a second end in open communication with a second collector chamber. An exhaust device is connected to the collector chamber for exhausting combustion gases generated by the gas burner from the oven via the second collector chamber and the tubes of the heat exchanger. The exhaust device may in turn include an ejector for aspirating the exhaust from the oven through an exhaust pipe open to the second collector chamber.

Gas convection oven and module thereof comprising a heat exchanger

A food frying apparatus includes a housing having a front side, a vessel mounted within the housing to contain oil, the vessel having an expansion zone adjacent the front side, and an oil heating container connected to the vessel, the container being positioned adjacent the front side and in communication with the expansion zone. An electrical heater is mounted on the exterior of the container to indirectly heat oil therein. The oil is forcibly circulated between the vessel and the container by means of a motor mounted beneath the container and a rotor coaxially mounted within the container and coupled to the motor. A plug is axially insertable into the top of the container, and an upper end of the rotor is connected to the plug for axial movement therewith. The rotor has a lower end connected to the motor to enable relative telescopic sliding movement therebetween to achieve coupling or uncoupling. The axial length of coupling between the motor and the lower end of the rotor is less than the axial length of movement of the plug to remove the plug from the container top.

Food frying apparatus including indirect oil heater

A convection oven is disclosed in which a duct for drawing hot air from the combustion chamber conveys the hot air to the heating chamber, said duct extending through the ventilation chamber and communicates therewith; it also communicates with an outlet duct so as to convey all the air drawn from the combustion chamber and a fractional volume of the ventilated air towards the outlet duct. The advantages are a reduction of the temperature of the fluids and a finer adjustment of the temperature in the useful areas of the oven.

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Porcia, Italy

Claudio Del Fabbro