| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent self-excited vibration in a control valve in a refrigerant piping structure provided with a refrigerant flow control valve such as a solenoid valve or check valve. <P>SOLUTION: BS units 30A, 30B are provided with main pipes 3c composing one part of a refrigerant circuit R, first branch pipes 3, and second branch pipes 3b. Solenoid valves 31, 32 are provided in each branch pipe 3a, 3b. Two Helmholtz resonators 33, 34 with different resonance frequencies are provided in the main pipe 3c. By this, the self-excited vibration in each solenoid valve 31, 32 is suppressed by the two resonators 33, 34. The resonators 33, 34 are composed so they can suppress self-excited vibration in a vibration frequency range of 30-70 Hz. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
