Patent ID: 7152618

Claim:
A vacuum station comprising: a collection tank for collecting sewage; a plurality of vacuum pumps for depressurizing and pressurizing an interior of said collection tank; a sewage inlet pipe connected to said collection tank; a sewage discharge pipe connected to said collection tank; and a controller for controlling said plurality of vacuum pumps; wherein said controller controls at least one of said vacuum pumps so as to rotate in normal direction so that the interior of said collection tank is depressurized to collect sewage into said collection tank through said sewage inlet pipe, and at least one of said vacuum pumps so as to rotate in reverse direction when the sewage in said collection tank reaches a predetermined sewage level so that the interior of said collection tank is pressurized to discharge the sewage from said collection tank through said sewage discharge pipe; wherein said plurality of vacuum pumps are roots-type vacuum pumps; and wherein a power control panel having said controller therein and said plurality of vacuum pumps are unitized to form an integrated unit structure, and said collection tank is installed in a manhole to form an integrated unit structure.