The invention provides a reciprocating type three-cylinder
plunger pump for an oil and gas field. The reciprocating type three-cylinder
plunger pump comprises a gear box
assembly, a power end assemblyand a hydraulic end
assembly which are transmitted in sequence; and the hydraulic end
assembly comprises a disc root and a
plunger, the power end assembly comprises a
crankshaft, a connecting rod, asliding rail and a
crosshead, power is transmitted from the
crosshead to the plunger, a pull rod and a
fender are arranged between the plunger and the
crosshead, the pull rod is fixed on the cross head, the plunger is fixed to the pull rod, the
fender is located between the pull rod and the plunger and fixed with the plunger, and the outer
diameter of the
fender is larger than that of the plungerand the pull rod. The reciprocating type three-cylinder
plunger pump can solve the problems that a working medium in a hydraulic end assembly in the prior art is poured into a power end assembly alongthe plunger, a packing is inconvenient to replace, and a connecting rod large-head bearing bush is insufficient in
lubrication and the like.