Aerator device and filter system including the same

A filter system comprising:

• a filter;
• an aerator device arranged below the filter, the aerator device comprising:
• a housing having an inner cavity defined therein, the housing including at least one sidewall and an upper surface connected to the at least one sidewall;
• a first partition formed within the inner cavity and extending in a downward direction from an upper end to a lower end to define a first cavity and a second cavity;
• and
• a second partition formed within the inner cavity between the first partition and a first sidewall of the at least one sidewall and extending in the downward direction from an upper end to a lower end to define a first chamber and a second chamber of the second cavity,
• wherein the housing comprises an inlet opening communicating with the first cavity and an outlet opening communicating with the second chamber,
• the first partition is spaced apart at the upper end thereof from the upper surface of the housing to form a first opening, through which the first cavity and the second cavity are in communication with each other,
• the upper end of the second partition is connected to the upper surface of the housing, the first chamber and the second chamber being in communication with each other below the lower end of the second partition;
• and
• a gas supply connected to the inlet opening and configured to supply a gas to the first cavity such that the gas passes from the first cavity through the first opening and below the lower end of the second partition to the second chamber to release gas bubbles only through the outlet opening,
• wherein the outlet opening passes through the upper surface of the housing in the upward direction, such that the gas bubbles are released only through the outlet opening in the upward direction, and the outlet opening is a slot extending parallel to the first partition and the second partition, and
• the filter and the aerator device are configured to be submerged in a liquid medium,
• the second chamber is defined by the second partition and the first sidewall facing each other, and a pair of opposite sub-sidewalls connecting the second partition and the first sidewall, and
• the second partition and the pair of opposite sub-sidewalls have a flat surface,
• wherein the second partition is parallel to the first sidewall, and at least one of the pair of opposite sub-sidewalls is inclined such that a distance between the pair of opposite sub-sidewalls decreases towards the upper surface of the housing such that the second chamber narrows along the upward direction towards the upper surface of the housing, or
• wherein the second partition and the first sidewall are inclined relative to each other such that a distance between the second partition and the first sidewall decreases towards the upper surface of the housing such that the second chamber narrows along the upward direction towards the upper surface of the housing,
• the outlet opening is on the upper surface of the housing, and is positioned at an upper area and vertically above a lower area,
• the upper area is defined by the upper end of the second partition, the first sidewall and a pair of second opposite sub-sidewalls,
• the lower area is defined by the lower end of the second partition, the first sidewall, and the pair of opposite sub-sidewalls,
• the upper area of the second chamber is smaller than the lower area of the second chamber,
• a ratio of the upper area to the lower area is about 1:2 to about 1:10, so that the gas bubbles released through the outlet opening can generate pulses,
• wherein the upper surface has a flat shape and constitutes a cover or a ceiling of the housing.