Impeller pump

Abstract

A centrifugal pump comprising a motor with a shaft rotatably extending therefrom and an adapter configured to be mounted to the motor at a first side, the first side including an opening for permitting passage of the shaft therethrough. A volute housing is configured to be mounted to a second side of the adapter, the adapter and volute housing defining a pumping chamber therebetween. An impeller is configured to be disposed within the pumping chamber and rotatably coupled to the shaft via a figured fastener. The impeller includes a first wall having a figured recess defined therein, the figured recessed configured to receive the figured fastener whereby rotation of the shaft causes rotation of the impeller.

What is claimed is: 
     
         1 . A centrifugal pump, comprising:
 a) a motor with a shaft rotatably extending therefrom;   b) an adapter configured to be mounted to the motor at a first side, the first side including an opening for permitting passage of the shaft therethrough;   c) a volute housing configured to be mounted to a second side of the adapter, the adapter and volute housing defining a pumping chamber therebetween; and   d) an impeller configured to be disposed within the pumping chamber and rotatably coupled to the shaft via a figured fastener, wherein the impeller includes a first wall having a figured recess defined therein, the figured recessed configured to receive the figured fastener whereby rotation of the shaft causes rotation of the impeller.   
     
     
         2 . The centrifugal pump of  claim 1 , and further comprising: e) a bore formed in the volute housing on the side opposite the impeller; and f) a removable cover secured to the volute housing, the cover configured to seal the bore in the volute housing. 
     
     
         3 . The centrifugal pump of  claim 2 , wherein the removable cover further comprises an inlet orifice, the inlet orifice configured to direct fluid into the volute housing. 
     
     
         4 . The centrifugal pump of  claim 1 , and further comprising: e) a bore formed in the volute housing on the side opposite the impeller; f) a removable cover secured to the volute housing, the cover configured to seal the bore in the volute housing; and g) a gasket having an integral flapper, the gasket secured between the volute housing and the removable cover, wherein the flapper aligns with the fluid inlet orifice to prevent fluid from exiting through the inlet orifice. 
     
     
         5 . The centrifugal pump of  claim 4 , wherein the flapper further comprises a weight, wherein the flapper includes a sidewall and external lip portion configure to removably secure the weight to the flapper. 
     
     
         6 . The centrifugal pump of  claim 5 , wherein the weight is a washer and wherein the flapper further includes a central nodule configured to seat within a central bore of the washer. 
     
     
         7 . A centrifugal pump, comprising:
 a) a motor with a shaft rotatably extending therefrom;   b) an adapter configured to be mounted to the motor at a first side, the first side including an opening for permitting passage of the shaft therethrough;   c) a volute housing configured to be mounted to a second side of the adapter, the adapter and volute housing defining a pumping chamber therebetween;   d) an impeller configured to be disposed within the pumping chamber and rotatably coupled to the shaft;   e) a bore formed in the volute housing on the side opposite the impeller;   f) a removable cover secured to the volute housing, the cover configured to seal the bore in the volute housing; and   g) a gasket having an integral flapper, the gasket secured between the volute housing and the removable cover, wherein the flapper aligns with the fluid inlet orifice to prevent fluid from exiting through the inlet orifice.   
     
     
         8 . The centrifugal pump of  claim 7 , wherein the flapper further comprises a weight, wherein the flapper includes a sidewall and external lip portion configure to removably secure the weight to the flapper. 
     
     
         9 . The centrifugal pump of  claim 10 , wherein the weight is a washer and wherein the flapper further includes a central nodule configured to seat within a central bore of the washer. 
     
     
         10 . A centrifugal pump, comprising:
 a) a motor with a shaft rotatably extending therefrom;   b) an adapter configured to be mounted to the motor at a first side, the first side including an opening for permitting passage of the shaft therethrough;   c) a volute housing configured to be mounted to a second side of the adapter, the adapter and volute housing defining a pumping chamber therebetween; and   d) an impeller configured to be disposed within the pumping chamber and rotatably coupled to the shaft via a figured fastener, wherein the impeller includes a first wall having a figured recess defined therein, the figured recessed configured to receive the figured fastener whereby rotation of the shaft causes rotation of the impeller,   wherein the volute housing includes an internal chevron-shaped flange proximate an exit of the impeller at a first end and a volute housing outlet orifice at a second end, the chevron-shaped flange configured to convert fluid velocity of a fluid exiting the impeller into fluid pressure at the outlet orifice.   
     
     
         11 . The centrifugal pump of  claim 1 , and further comprising:
 e) a second internal flange within the volute housing, the second flange defining a floor of a head space within the volute housing, the second flange recirculating fluid from the head space toward the impeller.