Rack-and-pinion coupled hydraulic multi-cylinder reciprocating pump

Abstract

The invention relates to a gear wheel and rack coupled hydraulic multi-cylinder reciprocating pump, which consists of a hydraulic oil cylinder, a coupling, a cylinder sleeve of a working hydraulic cylinder, a piston, a piston rod, a gear wheel, a suction valve, a discharge valve, a hydraulic directional control valve, a hydraulic oil pump, an electric motor, and the like which are assembled and connected. The piston rod is provided with a rack; the hydraulic oil cylinder and the piston rod are arranged parallelly; the gear wheel is engaged with racks on the two piston rods simultaneously; and the two piston rods are arranged according to the movement phase difference of 180 degrees. Two hydraulic oil cylinders and two working hydraulic cylinders form a basic unit, and for the two hydraulic oil cylinders in the basic unit, oil can be provided to both non-rod chambers and rod chambers, and can be only provided to the non-rod chambers of the oil cylinders. The invention can be combined into a multi-cylinder reciprocating pump with two cylinders, four cylinders, six cylinders, and more even cylinders. The hydraulic multi-cylinder reciprocating pump has the advantages of high systematic efficiency, long stroke, low stroke frequency, large displacement, high pump pressure, long service life of wearing parts, small fluctuation of the displacement and the pump pressure, good suction performance, and simple and convenient maintenance.

Description

technical field [0001] The invention relates to a gear-rack coupled hydraulic multi-cylinder reciprocating pump, which belongs to reciprocating pumps such as mud pumps, fracturing pumps, water injection pumps, polymer injection pumps and the like used in chemical industry, mining, petroleum and other industries. Background technique [0002] At present, reciprocating pumps are widely used at home and abroad. They are mainly composed of gear transmission, crankshaft, connecting rod and piston. The suction performance is poor, and it is difficult to meet the requirements of modern drilling technology, acid fracturing technology and water injection production technology. In order to achieve low stroke times, large displacement and high pump pressure, the existing reciprocating pump must adopt a larger transmission ratio and a longer stroke, the transmission system is more complicated, the system efficiency is lower, and the structural size of the pump is larger, especially The...

AI Technical Summary

Problems solved by technology

When the above-mentioned hydraulic reciprocating pump is working, one cylinder can only drive one hydraulic cylinder to enter or discharge liquid, or one cylinder can drive two hydraulic cylinders to enter or discharge liquid; the cylinder must supply oil to the rod cavity during the return stroke; a single cylinder realizes the working liquid. The pressurization capacity of the cylinder is greatly affected by the diameter of the cylinder; the coordinated control technology between the cylinders of the multi-cylinder reciprocating pump becomes very complicated with the increase of the number of cylinders

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