Waste water pump

A waste water pump comprising:

• an impeller;
• a pump housing surrounding the impeller;
• a first seal structure arranged between a first area of the impeller and a first area of the pump housing, the first area of the impeller comprising a first impeller outer annular surface, the first seal structure comprising the first impeller outer annular surface and another first seal structure annular sealing surface comprising a housing surface of the pump housing, the housing surface being located opposite the first impeller outer annular surface, wherein the first impeller outer annular surface defines a first groove in the first area of the impeller and the housing surface defines a second groove adjacent to the first area of the pump housing, and a second seal structure arranged between a second area of the impeller and a second area of the pump housing, the first seal structure, the second seal structure, a circumferential wall of the impeller and a wall of the pump housing defining an impeller side chamber, wherein the impeller side chamber is located between the pump housing and the impeller and the impeller side chamber is located axially between the first seal structure and the second seal structure with respect to a longitudinal axis of the impeller, wherein the first seal structure comprises a first seal conveying means for conveying debris from the impeller side chamber, the second seal structure comprising a second seal conveying means for conveying debris from the impeller side chamber, at least a portion of the second seal structure being located adjacent to the pressure side of the impeller, wherein the first seal conveying means and the second seal conveying means are configured to cooperate to move debris out of the impeller side chamber via actuation of the impeller;
• wherein the second seal structure comprises a pump housing inner annular surface in the second area of the pump housing and a second impeller outer peripheral annular surface in the second area of the impeller, the pump housing inner annular surface defining a third groove, the pump housing comprising a pump housing chamber surrounding the pressure side of the impeller, the second seal structure being arranged between the pump housing chamber and the impeller side chamber.

A waste water pump comprising:

• an impeller comprising a first impeller outer annular portion defining a first groove, the impeller further comprising a second impeller outer annular portion and a third impeller outer annular portion, the third impeller outer annular portion being located between the first impeller outer annular portion and the second impeller outer annular portion;
• a sealing structure comprising a sealing structure first lateral side portion and a sealing structure second lateral side portion, the sealing structure first lateral side portion comprising a second groove, the second groove being located radially opposite the first groove with respect to a longitudinal axis of the impeller;
• and a pump housing surrounding the impeller, the pump housing comprising a first pump housing portion, a second pump housing portion and a third pump housing portion, the first pump housing portion being in contact with the sealing structure first lateral side portion, the third pump housing portion being located between the first pump housing portion and the second pump housing portion, the second pump housing portion comprising a third groove, the third groove being located radially opposite the second impeller outer annular portion with respect to the longitudinal axis of the impeller, the second pump housing portion and the second impeller outer annular portion defining another sealing structure, at least the third pump housing portion and the third impeller outer annular portion defining an impeller side chamber located between the first groove, the second groove and the third groove, the first groove and the second groove being located at an axially spaced location from the third groove with respect to the longitudinal axis, the first groove, the second groove and the impeller side chamber defining at least a portion of a debris removal path, wherein the impeller is configured to drive debris along the debris removal path, the pump housing comprising a pump housing chamber surrounding a pressure side of the impeller, wherein the impeller side chamber is in fluid communication with the pressure side of the impeller via at least the third groove, the impeller side chamber being in fluid communication with an intake side of the impeller via the first groove and the second groove.

A waste water pump comprising:

• an impeder comprising a first impeller outer annular portion defining a first groove, the impeller further comprising a second impeller outer annular portion and a third impeller outer annular portion, the third impeller outer annular portion being located between the first impeller outer annular portion and the second impeller outer annular portion;
• a sealing structure comprising a sealing structure first lateral side portion and a sealing structure second lateral side portion, the sealing structure first lateral side portion comprising a second groove, the second groove being located radially opposite the first groove with respect to a longitudinal axis of the impeller;
• and a pump housing surrounding the impeller, the pump housing comprising a first pump housing portion, a second pump housing portion and a third pump housing portion, the first pump housing portion being in contact with the sealing structure first lateral side portion, the third pump housing portion being located between the first pump housing portion and the second pump housing portion, the second pump housing portion comprising a third groove, the third groove being located radially opposite the second impeller outer annular portion with respect to the longitudinal axis of the impeller, the second pump housing portion and the second impeller outer annular portion defining another sealing structure, at least the third pump housing portion and the third impeller outer annular portion defining an impeller side chamber located between the first groove, the second groove and the third groove, the first groove and the second groove being located at an axially spaced location from the third groove with respect to the longitudinal axis, the first groove, the second groove and the impeller side chamber defining at least a portion of a debris removal path, wherein the impeller is configured to drive debris along the debris removal path, wherein the third groove is provided between the pump housing chamber and the impeller side chamber, at least a portion of the second pump housing portion and at least a portion of the second impeller outer annular portion being arranged adjacent to a pressure side of the impeller.