| 摘要 |
PROBLEM TO BE SOLVED: To provide a HVAC unit capable of suppressing NZ sound from becoming larger due to acoustic resonance. SOLUTION: The HVAC unit 1 integrally includes a blower 20 composed of a multiblade fan, an evaporator 21, and a heater core 22 in a housing 10. A baffle plate 31 facing an air intake 11 of the housing 10 while maintaining a fixed interval between the air intake 11 and the baffle plate is further provided. The baffle plate 31 faces a region of at least one antinode of a sound field mode formed at the air intake 11 during resonance, thus causing air pressure sucked into a region of the plurality of antinodes to be unbalanced. As a result, an exciting force put into a resonance mode is released to hardly get into the resonance mode, thus suppressing NZ sound from becoming larger. COPYRIGHT: (C)2011,JPO&INPIT
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