Plunger pump fluid end assembly

Abstract

The invention relates to a plunger pump fluid end assembly which comprises a pump body (1) and a plunger (6). A plunger passage (18) is disposed inside the pump body (1), and the plunger (6) is movably arranged in the plunger passage (18). The plunger pump fluid end assembly is characterized in that a combination valve passage (19) which is arranged vertically and communicated with the plunger passage (18) is arranged in the pump body (1), a combination valve (3) is arranged in the combination valve passage, a fluid inlet valve (31) of the combination valve (3) is arranged on the lower portion while a fluid drain valve (32) of the combination valve (3) is arranged on the upper portion, and a fluid inlet cavity (16) communicated with the fluid inlet valve (31) of the combination valve (3) and a fluid drain cavity (17) communicated with the fluid drain valve (32) of the combination valve (3) are arranged on the pump body (1). The pump body of the plunger pump fluid end assembly cannot be cracked on the condition of high-pressure alternating stress, and the plunger pump fluid end assembly can work normally with media containing sand, suspended matters and the like.

Description

technical field [0001] The invention relates to a hydraulic end assembly of a plunger pump. Background technique [0002] The liquid end of the traditional plunger pump usually has the following structure: 1. Straight-through type (upper and lower valves), see attached figure 1 ;2. Three-way type (inlet valve vertical type, liquid discharge valve horizontal type), see attached figure 2 ; 3. Horizontal type (horizontal combined valve), see attached image 3 . The reliability of the liquid end, the cracking of the pump body, and the short life of the valve group of wearing parts are common problems in the liquid end of the three different shapes and structures under the condition of conveying high-pressure liquid. The analysis is as follows: [0003] The straight-through liquid end is a four-way structure, see the attached figure 1 When disassembling the plunger 11', the front flange 12' and the pressing block 13' can be disassembled from the front, which is more convenie...

AI Technical Summary

Problems solved by technology

The overall service life of the pump is reduced, and it cannot operate normally. Under the national policy of energy saving and emission reduction, there is no other way out for the sewage discharge in the oil field, and it can only be injected into the ground in time for oil displacement.

However, due to the heavy workload and high cost of sewage treatment, and the construction of sewage treatment stations in oil fields often cannot keep up with the actual needs, the sewage reinjection discharged from the produced crude oil is only completed by high-pressure water injection pumps

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