| 摘要 |
PURPOSE:To satisfy the requirement for a change in the amount of ventilation by a method wherein the magnitude of the area of a ventilation passage of a ventilation device is set corresponding to a max. ventilation condition required and a plate with an opening smaller than said area of the ventilation passage is detachably mounted to a ventilation port. CONSTITUTION:For ventilating the interior of a container by means of a ventilation device 40, a ventilation lid 50 is rotated about a bolt 51 to align an exhaust hole 52 and a suction hole 53 with an exhaust passage 56 and a suction passage 57 respectively. Whereupon the air in a chamber is exhausted to the outside from the upstream side of an evaporator 10 and at the same time fresh outside air is taken into the downsream side of the evaporator 10. In this arrangement, the ventilation passage area, i.e., area of the passages 56, 57, is set at a magnitude corresponding to a max. ventilation condition required. And a plate 71 with an opening 70 smaller than the ventilation passage area is detachably mounted to the outer end surfaces of ventilation ports, i.e., an exhaust cylinder 58 and suction cylinder 59, by means of screws 72. As a result, the requirement for a change in the quantity of ventilation can be satisfied. |
