| 摘要 |
PURPOSE: To attenuate noise having a frequency of a prescribed area generated from valves of a compressor by expanding the length of a cavity of an upper chamber and transferring a maximum value of transmission loss to a prescribed area. CONSTITUTION: In a noise attenuator 10, internal space is partitioned into an upper chamber 40a and a lower chamber 40b by a separating member 30. At this time, the upper chamber 40a is formed long because an upper surface of the lower chamber 40b contacts a side surface, that is, a side surface on an opposite side of a suction port 15. In this case, the length of a cavity that the upper chamber 40a forms becomes L1+L2. Thus, the cavity having a prescribed length is formed in the upper chamber 40a and a maximum value of transmission loss is transferred from a frequency area of noise generated from a coolant compression means. Noise has a frequency around 500 Hz. A frequency that transmission loss becomes a peak becomes lower when the length of the cavity becomes longer, the length of the upper chamber 40a is made redundant to L1+L2 and noise of a 500 Hz area can be attenuated.
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