Noise-preventative aquarium pump

In an aquarium pump having:

• a base portion having a bottom plate portion formed on a bottom of the base portion and a plurality of cushioning supporting legs secured under said bottom plate portion;
• an air-pumping means secured with an air-delivery silencer encased in an inner cover mounted on an inner extension formed on said bottom plate portion;
• an outer cover mounted on an outer extension circumferentially formed on a side edge portion of said bottom plate portion for shielding the inner cover already encasing the air-pumping means and said silencer in the inner cover;
• the improvement which comprises:
• said air-delivery silencer including:
• a main duct mounted with and fluidically communicated with the air-pumping means, a silencing box formed by combining a primary silencing box portion enlarged from the main duct and a secondary silencing box portion combinably secured with the primary silencing box portion by a packing plate partitioned between the two box portions, two air-discharge tubes connected with the secondary silencing box portion for delivering pumped air outwardly;
• said two silencing box portions respectively formed with a plurality of sinuous air passages therein each said sinuous air passage defined by two opposite corrugated side walls within a casing of each said box portion for reducing transmission speed and pressure of sound waves exerting from an operating air-pumping means for reducing noise pollution.