Reciprocating positive displacement pump for deionized water and method of cooling and lubricating therefor

Abstract

A method of lubricating and cooling a de-ionized water positive displacement pump having a reciprocating piston using tap water instead of de-ionized water to cool and lubricate the plunger and seals, resulting in longer service life of the pump.

1 . A method for lubricating and cooling a reciprocating plunger positive displacement pump for de-ionized water having a crankshaft housing and a pump housing with a compression chamber and a cooling and lubricating chamber and a compressing plunger passing through the cooling and lubricating chamber into the compression chamber and having a high pressure seal between the compression chamber and the cooling and lubricating chamber and a low pressure seal between the cooling chamber and the crankshaft housing, comprising the steps of: 
 (a) connecting the cooling and lubricating chamber to a source of tap water and a destination for flushing tap water;    (b) circulating tap water through the cooling and lubricating chamber to cool and lubricate the plunger and the seals; and    (c) flushing the circulating tap water to the destination.    
   
   
       2 . The method of  claim 1 , further comprising the step of valving the tap water to low pressure before circulating.  
   
   
       3 . A reciprocating positive displacement pump for de-ionized water, comprising: 
 a) a crankshaft housing;    b) a pump housing connected to the crankshaft housing with a de-ionized water inlet and a pressurized de-ionized water outlet;    c) an inline compression chamber and a cooling and lubricating chamber;    d) a reciprocating compression plunger extending from the crankshaft housing, through the cooling and lubricating chamber and into the compression chamber;    e) a high pressure seal between the compression chamber and the cooling and lubricating chamber about the plunger;    f) a low pressure seal between the cooling and lubricating chamber and the crankshaft housing about the plunger;    g) a tap water inlet into the cooling and lubricating chamber for bringing tap water thereinto; and    h) a flushing tap water outlet out of the cooling and lubricating chamber for removing the tap water out of the cooling and lubricating chamber.