A large and small double crankshaft multi-displacement reciprocating pump

Abstract

The invention discloses a multi-discharge-capacity reciprocating pump provided with large and small crankshafts. The multi-discharge-capacity reciprocating pump comprises a housing, a pump head component, a first piston component, a second piston component, a first crankshaft, a second crankshaft, a first connecting rod component, a second connecting rod component, a first clutching device, a second clutching device and an input shaft. The multi-discharge-capacity reciprocating pump disclosed by the invention is provided with the first crankshaft and the second crankshaft which are different in size so that the flow rate of the second piston component in work is smaller than that of the first piston component; by arranging the first clutching device and the second clutching device, the first crankshaft and the second crankshaft can work independently or simultaneously; by virtue of the first connecting rod component and the second connecting rod component. The first piston component and the second piston component can work independently or simultaneously, so the rotating speed of the pump is constant, while the flow rate can be divided into three modes including a small flow rate mode, an intermediate flow rate mode and a large flow rate mode, and thus the requirements on flow rate changes of the reciprocating pump are met, the rotating speed is constant so that the change range of a sliding speed of a sealing ring and a cylinder wall is reduced, and the service life of the reciprocating pump is prolonged.

Description

technical field [0001] The invention relates to the technical field of reciprocating pumps, in particular to a reciprocating pump with double crankshafts and multiple displacements. Background technique [0002] Reciprocating pumps are mainly used in oil fields, coal seam water injection, oil injection, oil production, hydraulic sand cleaning, and fertilizer plants to transport ammonia liquid, etc. If the flow-passing parts are made of stainless steel, they can transport corrosive liquids; in addition, according to different structural materials, they can also transport high-temperature tar , slime, high-concentration mortar, high-viscosity liquid, etc. When the reciprocating pump is working, the motor usually drives the crank connecting rod through the reduction transmission mechanism to drive the piston to reciprocate to generate water pressure and water flow. When the flow rate needs to be changed, the variable speed motor is generally used to adjust the speed of the pump...

AI Technical Summary

Problems solved by technology

The utility model patent with the patent announcement number CN200978785 discloses a flow ratio distribution multi-cylinder reciprocating pump that can change the effective displacement of a single cylinder. However, this invention is difficult to operate in practice and is extremely inconvenient. At the same time, the method of changing the eccentricity of the crankshaft and the diameter of the plunger will reduce the strength of the key components, the crankshaft and the plunger, and reduce the reciprocation. pump life

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