| 摘要 |
A double-shell air pump to absorb vibration and reduce noise includes an upper cap 1, a base 2, a bottom tray 5 and at least one air pump assembly 4. The upper cap 1 and the base 2 adopt a double-shell structure which has an inner shell 12, respectively 22, and an outer shell 11, respectively 20. The bottom tray 5 holds the air pump assembly 4 to deliver air which passes through a connection duct 531 or 532 into a side air chamber C1 or C2 and an air reservoir C3, then is discharged through an air discharge duct 541 to supply air for an aquarium. |
