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Discussion on the Structure of High Pressure Mud Pump of Petroleum Machinery


Petroleum machinery high pressure mud pump mainly consists of the following parts:
(I) power end
1. The pump casing and the pump cover are assembled and welded by steel plates.
The bearing seat of the driving shaft and the crankshaft is an integral cast steel part, which is welded with the pump casing after processing, and annealed after welding to eliminate residual stress.
2. Driving shaft
The size of the extended parts at both ends of the driving shaft of the mud pump is completely symmetrical, and large belt pulley or sprocket can be installed at either end, and the supporting bearings at both ends are single-row centripetal cylindrical short column roller bearings.
3. Crankshaft
Forging straight shaft and eccentric wheel structure is adopted, and the traditional integral casting crankshaft structure of three-cylinder pump at home and abroad is not adopted. The casting is converted into forgings and the whole is converted into assembly parts, which is easy to use, easy to build and easy to repair. The eccentric wheel, the big herringhead gear hub and the shaft adopt interference fit.
4. The connecting rod is cast by ZG35CxMo. The small end of the connecting rod is equipped with a pin shaft, and the two ends of the pin shaft are equipped with single-row centripetal short cylindrical roller bearings, which are assembled on the earth head body. The crosshead body is cast with ductile iron, and the guide plate is cast with ductile iron. The clearance between the guide plate and the crosshead is 0.26-0.38 m. The crosshead and the intermediate rod are connected with flanges and bolts.
(II) hydraulic end
1. Valve box: the whole forging is of vertical structure, with a clearance volume of only 7. 3 liters. It is a drilling pump series with small clearance volume zui in domestic high-power mud pumps. The three valve boxes provide drainage and suction through the discharge manifold and the suction manifold. One end of the discharge manifold is equipped with high-pressure four-way and discharge prepressure air bag, and the other end is equipped with lever-type shear safety valve.
2. Cylinder liner: bimetal cylinder liner is adopted, the inner material is high chromium wear-resistant alloy, the inner surface roughness is required to be within 0.20 range, and the inner surface hardness is ≥ HRC60. The cylinder liner is medium 100-medium 100. For users to choose.
The piston consists of a piston core, a leather cup, a pressure ring and a circlip, which meets the ministerial standards.

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Discussion on the Structure of High Pressure Mud Pump of Petroleum Machinery

Petroleum machinery high-pressure mud pump mainly consists of the following parts: (a) power end 1, pump casing and pump cover are made of steel plate welding. The bearing seat of the driving shaft and the crankshaft is an integral cast steel part, which is welded with the pump casing after processing, and annealed after welding to eliminate residual stress. 2. Driving shaft The size of the extended parts at both ends of the mud pump driving shaft is completely symmetrical. Large belt pulley or sprocket can be installed at either end. The supporting bearings at both ends adopt single-row centripetal short column roller bearings. 3. The crankshaft adopts forged straight shaft and eccentric wheel structure, and does not adopt the traditional integral casting crankshaft structure of three-cylinder pump at home and abroad. The castings are forgings and the whole is integrated.


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