Patent ID: 8047806

Claim:
An improved jet well pump, comprising: a centrifugal pump assembly ( 1 ) which is a centrifugal pump manufactured by stamping- welding; a jet pump assembly ( 2 ); said centrifugal pump assembly ( 1 ), comprising: a pump body ( 11 ); a pump cover ( 12 ) mounted into said pump body ( 11 ); an impeller ( 13 ); a shaft ( 14 ); and an electrical motor ( 15 ) arranged outside the pump body ( 11 ); said impeller ( 13 ) is mounted on said shaft ( 14 ) and driven by said motor ( 15 ); said jet pump assembly ( 2 ), comprising: a jet pump body ( 21 ); a nozzle ( 22 ) mounted in said jet pump body ( 21 ); and a throat part ( 23 ) disposed on the upper end of said jet pump body ( 21 ); said centrifugal pump assembly ( 1 ) and said jet pump assembly ( 2 ) communicated with each other by means of an inlet pipe ( 3 ) and a return pipe ( 4 ), upper ends of said inlet pipe ( 3 ) and the return pipe ( 4 ) connected with an inlet ( 111 ) and an outlet ( 112 ) that are arranged on an axial surface of the pump body ( 11 ) respectively, and lower ends of said inlet pipe ( 3 ) and the return pipe ( 4 ) connected with said throat part ( 23 ) and said jet pump body ( 21 ) respectively, a radial shape of said pump body ( 11 ) is a full spiral gradually increasing along with a radial-outward direction of fluid flow, a section plane of the radial shape is an isosceles trapezoid having a slope in smooth variety, an inclination of said isosceles trapezoid β increasing as a radial depth of said pump body increasing, with a range between 20° and 85°.