| 摘要 |
A cooling apparatus with a simple structure in which the temperature distribution of an object to cool can be kept even and no whistle sound is generated at a duct is realized. It comprises a duct 102 including a nozzle plate 109 through which a nozzle 105 is bored so that a coolant is jetted through the nozzle 105 and made to collide as a cooling stream 106 against an object 101a to cool, and an inclined opposite plate 109 which is disposed oppositely to the nozzle plate 109 so as to make the current of the coolant tend to the nozzle plate 109, and a resonance-preventing plate 108 attached to an area of the inside surface of the opposite plate 103 including the point at which an horizontal extension of the nozzle 105 intersects the inside surface of the opposite plate 103 so that the horizontal distance l ÄmÜ of the nozzle 105 from the inside surface of the resonance-preventing plate 108 is not equal to a resonance distance l0 = (1/2) . ä(c . d)/( nu . u)ü where c represents the speed of sound Äm/sÜ in the stream 106 of the coolant, d represents the diameter ÄmÜ of the nozzle 105, nu represents Strouhal number, and u represents the velocity Äm/sÜ of the stream 106 of the coolant jetted through the nozzle 105. Because the horizontal distance l of any nozzle from the opposite plate 103 or the resonance-preventing plate 108 does not coincide with the resonance distance l0 of the cooling stream 106, a standing wave W is not generated in the duct 102 and so the generation of a whistle sound is prevented. <IMAGE> |
