초록 ▼

An improved low specific speed pump is disclosed, which provides for greater consistency of pump operating efficiencies obtainable by pumps of any given group of like size pumps. In the present pump, the internal dimensions of the pump chamber and discharge passage are enlarged to provide for a redu

An improved low specific speed pump is disclosed, which provides for greater consistency of pump operating efficiencies obtainable by pumps of any given group of like size pumps. In the present pump, the internal dimensions of the pump chamber and discharge passage are enlarged to provide for a reduction in flow velocities therewithin compared to a conventional pump of a given design flow capacity and a controlled size restrictor is arranged adjacent the pump discharge in order to reduce the resultant increase in flow capacity to such given design value.

대표청구항 ▼

A low specific speed centrifugal pump having a desired discharge flow rate, which comprises in combination: a casing of cast metal construction defining a pump chamber, an inlet opening, a discharge passage having an inlet end communicating with said chamber and an outlet end, and a constriction ext

A low specific speed centrifugal pump having a desired discharge flow rate, which comprises in combination: a casing of cast metal construction defining a pump chamber, an inlet opening, a discharge passage having an inlet end communicating with said chamber and an outlet end, and a constriction extending across said outlet end, said pump chamber having an outer boundary surface extending away from a cut-water and about said pump chamber to a point at which it cooperates with said cut-water to define said inlet end of said discharge passage, said constriction having a restrictor flow opening extending therethrough in flow communication with said discharge passage; and an impeller supported for rotation about an axis within said chamber for transporting fluid between said inlet opening and said outlet end, said chamber and discharge passage leading to said restriction having a size sufficient to provide an other pump discharge flow rate exceeding said desired flow rate by arranging said outer boundary surface at a radial distance from said axis which is greater than that required to provide said desired flow rate, the radial distance between said cut-water and said axis corresponding to that required to provide said desired discharge flow rate, and said restrictor flow opening throttles said pump to reduce said other flow rate to said desired flow rate.