Sealing structure of plunger pump

Abstract

A sealing structure of a plunger pump, comprising: a pump body and a plunger rod assembly disposed in the pump body; wherein the pump body includes an upper pump and a lower pump, and the upper pump and lower pump are fixed by screw connection; a sealing ring provided between the upper pump and the lower pump; wherein the plunger rod assembly includes an annular groove disposed at a position adjacent to a lower portion of the plunger rod at an outer peripheral surface thereof; a dynamic lip seal fitted in the annular groove; and a static lip seal sleeved on the outer peripheral surface of the plunger rod; the sealing structure of the plunger pump has good sealing effect, good anti-wear and anti-wear effect, simple replacement and low maintenance cost.

1 . A sealing structure of a plunger pump, comprising: 
       a pump body and a plunger rod assembly disposed in the pump body; 
       wherein the pump body includes an upper pump and a lower pump, and the upper pump and lower pump are fixed by screw connection; a sealing ring provided between the upper pump and the lower pump; a feed inlet disposed on the lower pump and a discharge outlet disposed on the upper pump; a lock nut disposed at an upper end of the upper pump; 
       wherein the plunger rod assembly includes a plunger rod which extends into the pump body through a through hole in the center of the lock nut; a dust boot disposed between the plunger rod and the through hole; an annular groove disposed at a position adjacent to a lower portion of the plunger rod at an outer peripheral surface thereof; a dynamic lip seal fitted in the annular groove; and a static lip seal sleeved on the outer peripheral surface of the plunger rod; 
       wherein the static lip seal having an upper end is disposed on a first seal ring and having a lower end is disposed on a first positioning seat; the first positioning seat is disposed on a step of an inner wall of the pump body and the first seal ring is disposed on a bottom surface of the lock nut;
 wherein the static lip seal and an inner wall of the upper pump have at least two gasket rings disposed therebetween; 
 wherein the dynamic lip seal includes a second seal ring disposed at a top surface thereof and a second positioning seat disposed at a bottom surface thereof; the second seal ring and the second positioning seat are fitted in the annular groove, and are abutted against top and bottom surfaces of the annular groove, respectively; 
 wherein the feed inlet of the lower pump includes a feeding seal ring disposed thereon; a feed valve seat disposed at the lower pump adjacent to a bottom surface of the feed inlet; a limiting seat attached to the feed valve seat; a lower pump sealing ring disposed between the feed valve seat and a bottom surface of the lower pump; and a valve ball disposed in an accommodating space which is formed between the limiting seat and the feed valve seat.