Hydraulic mud pump

Abstract

The invention discloses a hydraulic mud pump which is provided with an oil inlet P, an oil return opening T, a pulp inlet V and a high-pressure pulp outlet H, and comprises a pressure cylinder and a hydraulic operated directional valve assembly. The pressure cylinder comprises a low pressure cylinder, a low pressure piston, a left high pressure plunger, a right high pressure plunger, a left high pressure cylinder and a right high pressure cylinder; a first oil inlet passageway, a second oil inlet passageway, a first control passageway and a second control passageway are arranged on the low pressure cylinder; an annular communicating groove is formed in the low pressure piston; when the low pressure piston leftwards moves to a position completely covering a first through-flow groove, the first oil inlet passageway and the first control passageway communicate through the communicating groove, the hydraulic operated directional valve assembly is controlled to reverse, and the low-pressurepiston is braked through a sealed left piston cavity; and when the low pressure piston rightwards moves to a position completely covering a second through-flow groove, the second oil inlet passagewayand the second control passageway communicate through the communicating groove, the hydraulic operated directional valve assembly is controlled to reverse, and the low-pressure piston is braked through a sealed right piston cavity. The hydraulic mud pump not only is simple in structure, but also has no need to be electrically controlled, and has low noise.

Description

technical field [0001] The invention relates to the technical field of mud pumps, in particular to a hydraulic mud pump. Background technique [0002] In the field of engineering, especially in the petroleum industry, it is necessary to transport liquids with high viscosity, large specific gravity or high sand content and relatively low flow rate under high pressure, such as circulating mud and injecting cement when sticking wells, and used for oil production Crude oil transportation, well washing and water injection and formation fracturing, so the mud pump is a common key equipment in the petroleum industry. At present, most of the mud pumps at home and abroad adopt the form of mechanical drive. From the perspective of obtaining the reciprocating motion of the pump, the single-cylinder single-acting pump driven by the crank slider has no practical significance, because its displacement is very uneven. , whose value is 3.14; in addition, there are three-cylinder single-act...

AI Technical Summary

Problems solved by technology

The three comparative patents retrieved above indicate that hydraulically driven single-cylinder double-acting forms are not used in the field of mud pumps, and their common feature is that although they are all hydraulically controlled double-acting pumps, they The commutation problem is realized by the micro switch of the mechanical movement collision circuit. In practical application, there must be electronic control, which is not suitable for use in the explosion-proof environment; and because the micro switch has been bumped many times, the service life is short short, unreliable

In addition, the existing hydraulic mud pumps on the market will generate noise due to the collision between the piston and the cylinder head after the drive cylinder moves to the end in one direction.

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