Three-filler type reciprocating seal using pressurizing middle flushing cavity and reciprocating pump thereof

Abstract

The invention discloses a three-filler type reciprocating seal using a pressurizing middle flushing cavity and a reciprocating pump thereof. The three-filler type reciprocating seal is suitable for transportation of high-temperature oil coal slurry pressurized to 7.0-25.0MPa; two-filler seal is arranged at the rear end (far away the pump cylinder end) of a stuffing box; a first filler seal (high pressure filler seal) is arranged in a pressure-bearing sealing cavity formed by a cavity at the front end of the stuffing box and the cavity at the rear end of a plunger sleeve; a flushing cavity system between the first filler seal and a middle filler seal adopts pressurizing flushing; compared with the traditional low-pressure flushing, pressurizing flush enables the probability that the main liquid harmful matters (high temperature liquid, high solid concentration slurry, corrosive or flammable and explosive or toxic or radioactive components with fierce deleterious effect) of the pump cylinder penetrate through the first filler seal to leak into the middle flushing cavity to be nearly reduced to zero, middle flushing fluid is also enabled to enter the gap between the first filler sealand a plunger to lubricate and cool the first filler seal and the plunger, so that consumption of high pressure filling oil is reduced favorably, the operating safety of the plunger end is remarkablyimproved, and the application range of the plunger reciprocating pump is enlarged.

Description

technical field [0001] The invention relates to a three-packing reciprocating seal with a pressurized intermediate flushing chamber and its reciprocating pump, which is suitable for the transportation of high-temperature oil and coal slurry to a pressure of 7.0-25.0 MPa. The two packing seals are centrally arranged at the rear end of the stuffing box ( away from the pump cylinder end), the first packing seal (high-pressure packing seal) is arranged in the pressure-bearing sealing chamber formed by the front cavity of the sealing box and the rear end cavity of the plunger sleeve, and the flushing between the first packing seal and the intermediate packing seal The cavity system adopts pressurized flushing. Compared with the traditional low-pressure flushing, it can make the main liquid of the pump cylinder harmful substances (high-temperature liquid, high-solid concentration slurry, corrosive or explosive or toxic or radioactive components with strong harmful effects). The prob...

AI Technical Summary

Problems solved by technology

The plunger stuffing box assembly of the pump set uses 3 packings, 2 packing seals are arranged at the outer end of the stuffing box (away from the pump cylinder end) and 1 packing seal is arranged at the inner end of the stuffing box (near the pump cylinder end); Type plunger plunger stuffing box sealing structure, can be applied to large flow (that is, long plunger), medium and high pressure (such as pressure 2.0 ~ 25.0MPa), but there is no clear flushing oil (intermediate flushing chamber) operation pressurized flushing

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