Crankshaft arrangement and plunger pump

By employing a crankshaft assembly and lubrication passage design with a specific crank sequence in the plunger pump, the problem of flow fluctuation caused by complex loads on the crankshaft bearing was solved, resulting in a more stable hydraulic end displacement and reduced overall machine vibration, thus improving the working performance of the plunger pump.

CN224550326UActive Publication Date: 2026-07-24YANTAI JEREH PETROLEUM EQUIP & TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
YANTAI JEREH PETROLEUM EQUIP & TECH CO LTD
Filing Date
2025-06-16
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, the crankshaft in the piston pump is subjected to complex periodic loads, which leads to large instantaneous flow fluctuations, easily causing vibration of the whole machine and affecting its working performance.

Method used

By employing a crankshaft assembly with a specific crank sequence arrangement, the fluid discharge sequence of each cylinder liner is 1-3-5-2-4, reducing the fluctuation between theoretical and actual displacement. The lubrication of the crankshaft is achieved through the design of the lubrication oil passage, reducing the impact of inertial forces on the main bearing.

Benefits of technology

This resulted in a smoother hydraulic displacement, reduced instantaneous flow fluctuations, decreased overall vibration of the plunger pump, and improved performance.

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Abstract

The application relates to a crankshaft device and a plunger pump, the crankshaft device comprising a crankshaft body, the crankshaft body comprising a connecting crank portion and a crank web portion, the crank web portion comprising a first crank web, a second crank web, a third crank web, a fourth crank web and a fifth crank web arranged in sequence along the axial direction of the crankshaft body, the first crank web, the second crank web, the third crank web, the fourth crank web and the fifth crank web being uniformly distributed on the crankshaft body at an included angle of 72 DEG; wherein the first crank web is distributed at a phase angle of 0 DEG-72 DEG, the third crank web is distributed at a phase angle of 72 DEG-144 DEG, the fifth crank web is distributed at a phase angle of 144 DEG-216 DEG, the second crank web is distributed at a phase angle of 216 DEG-288 DEG, and the fourth crank web is distributed at a phase angle of 288 DEG-360 DEG. The crankshaft device can reduce the amplitude of instantaneous flow fluctuation, reduce the whole machine vibration of the plunger pump, and thus improve the working performance of the plunger pump.
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