| 摘要 |
<p>The apparatus comprises a housing (12) having a tunnel-like cavity (28) through which food products to be heated are conveyed on a conveyor (32). Air is drawn from within the tunnel cavity over a burner in flame tube (54) by centrifugal blowers (40), with air flow directed against the food products through upper and lower foraminous plates (86, 88) disposed above and below and adjacent to the tunnel cavity (28). Aerodynamically efficient ducting of the heated circulating air is provided by scroll-shaped passages (73, see Figure 6) positioned in association with the blowers (40), and venturi-like passages (77, 79) positioned upstream of the foraminous upper and lower plates (86, 88). </p> |
