| 摘要 |
An insulated cabinet (10) with interchangeable heat transfer units (12, 36, 50, 72) disposed on top thereof, the heat transfer units (12, 36, 50, 72) may be refrigeration-type units, freezer-type units, heating-type units, warming-type units or proofing units and each of the heat transfer units (12, 36, 50, 72) includes a rectangular opening in the bottom thereof to which is attached a duct (104) through which heated or cooled air is forced, the duct (104) has parallel front and rear walls and inclined sides (124, 126) which taper to reduce the cross section of the duct, the duct (104) being a sliding fit inside a tunnel (106) which extends vertically along the back wall of the cabinet (10). The tunnel (106) is provided with two columns of louvers (140) along its entire length through which the air from the duct (104) flows. Air exiting the louvers (140) is deflected by a baffle plate (146) which extends the full width of the rear of the cabinet (10). The edge portions (152, 154) of the baffle plate (146) are perforated. The air thus must move out forward through the louvers (140) then laterally across the solid portion of the baffle plate (146) before turning forward again through the perforations in the baffle plate into the interior of the cabinet (10). The improved air (low greatly reduces temperature differences within the carbinet (10) when used as an oven, and the air flow over the heating elements is more uniform, reducing hot spots and thus prolonging their life. |
