154 TRANSACTIONS OF THE 



Andr eld's Patent Anti-Friction Centrifugal Pump. 

 W. D. Andrews, 414 Water street, New- York. 



Fig. 1, is a perspective view of the pump in position for use. 



Fig. 2, a vertical section. 



Fig. 3, the rotating disc and propelling wings. 



Fig. 4, the stationary hub and induction passages. 



Similar letters refer to like parts. 



The arrows show the direction in which the disc rotates. 



A, is the base of the pump, by which it is secured in position. 

 C, is the chamber, cast in one piece, with base A, and strength- 

 ened by brackets a, a, a, a. The chamber is connected by flanges 

 b, b, to the conducting case, composed of two parts D, D', joined 

 by flanches d,d', forming a spiral eduction passage E, commencing 

 a, b, c, and gradually enlarging to the discharge orifice e'. 



F, is a stuffing box, through which passes the driving shaft G, 

 supported in a long bearing on standard H, which is bolted to 

 bosses I, I', upon the spiral passage E. 



K, fig. 2, is the disc, secured upon shaft G, to which its periphery 

 forms an angle of forty-five degrees. Upon its periphery are 

 secured wings, 1, 2, 3,4,5,6; fig. 3, closely fitting the space 

 between it and chamber C, within which they revolve without 

 touching. The upper ends of the wings extend above disc K, in 

 close proximity to case D^, but not touching it, and terminate 

 on a line parallel to shaft G. L, is the hub, secured in the lower 

 part of case C, by stationary curved wings 1, 1, 1, 1, which form 

 spiral induction passages. N, is a hardened steel step, secured in 

 hub L. A recess in the end of shaft G, receives a hardened steel 

 button n, the convex surface of which rests and revolves upon 

 the convex end of step D, supporting disc K, its shaft, &c. 



0, is a belt, upon pulley P, communicating through shaft G to 

 the disc and wings. Upon the end of passage E is a llanch, to 

 which pipes are attached for forcing the water wherever required. 

 The suction j^ipe B, fig. 2, is bolted to base A, and has a valve at 

 its lower end, not shown. 



Operation. — The suction pipe and pump being first filled with 

 w^ater, rapid motion is given to disc K, Avlien tlie centrifugal force 

 communicated to the Avater between its wings, carries it up the 



