| 摘要 |
A cooling apparatus having a simple structure is provided in which the temperature distribution of an object being cooled can be kept even and no whistle sound is generated at a duct. The apparatus comprises a duct including a nozzle plate through which a nozzle is bored so that a coolant is jetted through the nozzle, colliding as a cooling stream against an object. An inclined opposite plate is disposed opposite the nozzle plate so as to make the current of the coolant tend to the nozzle plate. A resonance-preventing plate is attached to an area of the inside surface of the opposite plate including the point at which a horizontal extension of the nozzle intersects the inside surface of the opposite plate so that the horizontal distance l of the nozzle from the inside surface of the resonance-preventing plate is not equal to a resonance distance l0. Because the horizontal distance l of any nozzle from the opposite plate or the resonance-preventing plate. does not coincide with the resonance distance l0 of the cooling stream, a standing wave W is not generated in the duct, preventing the generation of a whistle sound.
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