Professional hot air recirculation oven for cooking food

Abstract

The present invention relates to an improved professional oven for cooking food, being of the forced air recirculation type, comprising, at a rear part of a food cooking chamber and connected thereto, a chamber for air ventilation and heating, means being provided for introducing humidification water in the heating chamber, in order to humidify the hot air injected into said cooking chamber, and means for discharging the hot exhaust gases from the cooking chamber towards the outside. The humidification water and the hot exhaust gases flow within heat exchange means for the cooling of the hot exhaust gases that exit from the cooking chamber and the preheating of the humidification water prior to entry in said heating chamber.

1 . An improved professional oven, for cooking food ( 10 ), of the type with forced air recirculation, comprising, at a rear part of a food cooking chamber ( 11 ) and connected thereto, a chamber ( 12 ) for air ventilation and heating, means being present for introducing humidification water in said heating chamber ( 12 ), in order to humidify the hot air injected into said cooking chamber ( 11 ), and means for discharging the hot exhaust gases from said cooking chamber ( 11 ) outward, said improved oven being characterized in that said humidification water and said hot exhaust gases flow within heat exchange means ( 13 ) for the cooling of the hot exhaust gases that exit from the cooking chamber ( 11 ) and for the preheating of the humidification water prior to entry in said heating chamber ( 12 ). 
     
     
         2 . The improved oven according to  claim 1 , characterized in that said heat exchange means have at least one concentric tube exchanger ( 16 ), which comprises an inner tubular duct ( 18 ) for the passage of one of the two involved fluids, or of the hot exhaust gases ( 14 ) from the inside of the cooking chamber ( 11 ) outward, or of said humidification water ( 15 ), and an outer tubular duct ( 19 ), which is arranged so as to surround at least part of said inner tubular duct ( 18 ), which forms an annular interspace ( 20 ) in which the other one of said two involved fluids is adapted to flow. 
     
     
         3 . The improved oven according to  claim 2 , characterized in that it comprises two concentric tube exchangers ( 16 ,  17 ), each of which comprises an inner tubular duct ( 18 ) that has a vertical rectilinear axis ( 23 ), is closed in a lower region and is connected to the cooking chamber ( 11 ) by means of two sleeves ( 21 ,  22 ) with an axis that is transverse to said vertical rectilinear axis ( 23 ), a first lower sleeve ( 21 ) and a second upper sleeve ( 22 ), and an outer tubular duct ( 19 ), which is contoured so as to surround said inner tubular duct ( 18 ) in the region between the two first ( 21 ) and second ( 22 ) sleeves, said outer tubular duct ( 19 ) having two nozzles, an upper one ( 24 ) and a lower one ( 25 ) for the inflow and the outflow of the humidification water ( 15 ). 
     
     
         4 . The improved oven according to  claim 3 , characterized in that in said outer tubular duct ( 19 ) the humidification water ( 15 ) is introduced from the upper nozzle ( 24 ), so that the concentric tube exchanger operates in countercurrent. 
     
     
         5 . The oven according to  claim 2 , characterized in that said humidification water ( 115 ) flows in said inner tubular duct ( 118 ), said hot exhaust gases ( 114 ) flowing in said outer tubular duct ( 119 ). 
     
     
         6 . The improved oven accordly to  claim 5 , characterized in that said outer tubular duct ( 119 ) is constituted by a first tube with a vertical rectilinear axis ( 123 ), which is closed in a downward region and is connected to the cooking chamber by virtue of two sleeves with an axis that is transverse to said vertical rectilinear axis, a first lower sleeve ( 121 ) and a second upper sleeve ( 122 ), while said inner tubular duct ( 118 ) is constituted by a second tube, which has a smaller transverse cross-section than the outer tubular duct ( 119 ), enters said outer tubular duct ( 119 ) at the junction ( 126 ) with the upper sleeve ( 122 ) and exits from the outer tubular duct ( 119 ) at the junction ( 127 ) thereof with said lower sleeve ( 121 ).