Patent ID: 11951447
Assignee: TSURUMI MANUFACTURING CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  F  Y | IPC B  F

Claim 0:
1. A submersible aeration apparatus comprising:
an air passage formed on an upper side of a pump chamber to draw air into the pump chamber;
a suction port formed on a lower side of the pump chamber to draw liquid into the pump chamber;
an impeller arranged in the pump chamber and configured to rotate so as to draw air through the air passage and liquid through the suction port;
an ejection passage formed to eject the air and liquid drawn into the pump chamber to the outside; and a casing having the pump chamber formed inside the casing,
wherein
the impeller includes a main plate portion arranged to overlap a connection port connecting the air passage to the pump chamber, and a vane portion protruding downward from a lower surface of the main plate portion on the suction port side;
the main plate portion has a cut-out part connecting the air passage and the pump chamber to each other, and a concave groove part recessed from an upper surface of the main plate portion toward the lower surface and extending from an inner peripheral side toward an outer peripheral side of the main plate portion;
an outer peripheral side end of the groove part extends to an outer peripheral side end surface of the main plate portion; and
the impeller is configured to flow air into the pump chamber from the air passage through the cut-out part, and to flow air into the groove part and then into the pump chamber from the groove part through a gap between the casing and the outer peripheral side end surface of the main plate portion.