| 摘要 |
PURPOSE:To contrive to improve the cooling performance by a constitution wherein a duct is of a double strusture, the inner side of which serves as a main flow passage while the outer side of which serves as an auxiliary flow passage, the speed of the flow passing therethrough is lower then that of the flow passing through the main flow passage, in an air conditioning device to spot-blow cold air by the duct. CONSTITUTION:The air sucked through a suction port 12 by rotating a fan 6 is cooled by an evaporator 4 and sent through a lead-out duct 13 into an inner tube 15b. On the other hand, the air 19 sucked by means of a fan 20 is sent through a space 1a to an auxiliary flow passage 18. Accordingly, the air having the temperature the same as that of the ambient air is blown-off from an auxiliary flow blow-off port 18a in such a manner as to case the cold air delivered through a main flow passage at the main flow blow-off port 17a of the outlet 15c of a duct 15. In this case, the air flow rate of auxiliary flow is made smaller than that of main cold flow, that is, the flow speed of auxiliary flow air 18 is made smaller than that of main flow air. As a result, the viscous force produced between the resultant cold flow air and the ambient air is held down to a small value and the cold flow air can be prevented from being dampened by diffusion. Consequently, the improvement of the cooling performance can be resulted. |
