Counter-rotary pumps for chemical liquids and particularly dyes and the like

Claim 1

An improved, reversible, counter-rotating pump for dyes and other chemical liquids comprising a first shaft having a first rotor mounted thereon, a second shaft coaxial with and facing said first shaft having a second rotor mounted thereon, said first and second rotors facing one another with a small gap therebetween, and each said rotor comprising a hollow cylindrical body open facing one another across said gap, each said hollow body having radial openings therethrough for discharge by centrifugal action; means to drive said shafts and rotors in opposite directions including first driving means to turn said first shaft and first rotor, and second driving means to turn said second shaft and second rotor; a casing about said rotors having a flanged first portion and a flanged second portion joined in juxtaposition by said flanges, a radially extending liquid intake nozzle on said first casing portion and a radially extending liquid outlet nozzle on said second casing portion; a first bellmouth for supporting said first shaft and a second bellmouth for supporting said second shaft, a first hollow block about said first shaft between said first rotor and said first bellmouth and a second hollow block about said second shaft between said second rotor and said second bellmouth, each said block containing an annular refrigeration chamber surrounding its respective shaft with an annular space therebetween, means to hydraulically seal and pack each said shaft in the annular space between the shaft and its respective said refrigeration chamber, each said refrigeration chamber of each said block being axially adjacent its respective said rotor with a small clearance therebetween and with radial grooves on each said rotor within the small clearance for the relief of pressure by centrifugal action; and a first essentially helicoidal blade having a flat surface and a given constant pitch located on the outer cylindrical surface of said first rotor, and a second essentially helicoidal blade having a flat surface and said constant pitch opposite to the direction of pitch of said first helicoidal blade located on the outer cylindrical surface of said second rotor.