A plunger pump power end

Abstract

The invention relates to a plunger pump power end. The plunger pump power end comprises a machine body (1), a crankshaft (2) arranged in the machine body (1) and N transmission assemblies driven by the crankshaft (2) to permit radial-direction reciprocating motion. The N transmission assemblies are connected with N plungers (10) at the liquid force end respectively, wherein N is a natural number; the two ends of the crankshaft (2) are connected with the machine body through bearings; the plunger pump power end is characterized in that the N transmission assemblies are same in structure and all comprise connecting rods (3) and crossheads (4), wherein first ends of the connecting rods (3) are connected with a connecting rod shaft neck of the crankshaft through connecting-rod-large-end rolling bearings (8), the second ends of the connecting rods (3) are hinged to the first ends of the crossheads (4), the plungers (10) at the liquid force end are connected with the second ends of the crossheads (4). Compared with the prior art, the plunger pump power end has the advantages that the plungers at the liquid force end are directly connected with the crossheads, middle connecting rods are omitted, the problem that the middle rods are prone to oil leaking is solved, and assembling and disassembling are convenient.

Description

technical field [0001] The invention relates to a power end of a plunger pump. Background technique [0002] The power end of the reciprocating plunger pump generally includes a fuselage, a crankshaft, a connecting rod, a crosshead, and an intermediate rod installed in the fuselage. The intermediate rod is connected to the plunger at the hydraulic end. The crosshead and the intermediate rod drive the plunger to reciprocate; in the above connection structure, except for the roller bearing installed at the connection between the crankshaft and the fuselage, sliding friction structures such as tile bushings are used between other friction parts. The crosshead and the intermediate rod are generally connected by thread or flange, and the intermediate rod is connected with the plunger. The crosshead slideway of the fuselage is generally of the integral cylindrical type or the thin-walled cylinder liner inlay type. If the multi-cylinder structure, the inter-cylinder are isolated f...

AI Technical Summary

Problems solved by technology

The power end of the traditionally designed plunger pump often has design deficiencies, such as low efficiency and high noise. In practical applications, it often occurs that the end of the slideway hole of the fuselage is rough and heated, and the stress concentration cracks, especially the nose bridge between the cylinders is easy to crack, and the middle rod The seal is prone to oil leakage, difficult to assemble and disassemble, especially the connection with the hydraulic end is difficult to disassemble after being corroded on site, and the power end is large in size. These inherent deficiencies have affected the development of reciprocating plunger pumps to high efficiency, energy saving, and lightweight

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