Super-power five-cylinder plunger pump

Abstract

The present invention discloses a super-power five-cylinder plunger pump, including a power end assembly, a hydraulic end assembly and a reduction gearbox assembly. The power end assembly is designed as a segmented structure including a crankcase, a crosshead case and a spacer frame. One end of the crosshead case is connected to the crankcase, and the other end of the crosshead case is connected to the spacer frame. The hydraulic end assembly is disposed at an end of the spacer frame and is connected to the crankcase through bolts sequentially passing through the spacer frame and the crosshead case. The reduction gearbox assembly is connected to the crankcase. A crankshaft in the crankcase is forged from alloy steel and includes six axle journals and five bellcranks. One bellcrank is disposed between every two adjacent axle journals, and the distance between the center of rotation of the bellcrank and the center of rotation of the crankshaft is 110 to 160 mm. Beneficial Effects: The super-power five-cylinder plunger pump has a rated input power of 5000 hp to solve the problem that there is no existing plunger pump of a specification matching high-power electric motors in electric drive fracturing, and solve the conflict between the limited well-site conditions in the oil and gas fields and the need of multiple matched fracturing equipment.

What is claimed is: 
     
         1 . A super-power five-cylinder plunger pump, comprising a power end assembly, a hydraulic end assembly and a reduction gearbox assembly, wherein the power end assembly is designed as a segmented structure comprising a crankcase, a crosshead case and a spacer frame, one end of the crosshead case is connected to the crankcase through bolts, and the other end of the crosshead case is connected to the spacer frame through bolts, the hydraulic end assembly is disposed at an end of the spacer frame and is connected to the crankcase through bolts sequentially passing through the spacer frame and the crosshead case, the reduction gearbox assembly is connected to the crankcase through bolts, a crankshaft in the crankcase is forged from alloy steel and comprises six axle journals and five bellcranks, one bellcrank is disposed between every two adjacent axle journals, and the distance between the center of rotation of the bellcrank and the center of rotation of the crankshaft is 110 to 160 mm. 
     
     
         2 . The super-power five-cylinder plunger pump according to  claim 1 , wherein an input angle of the reduction gearbox assembly can be adjusted according to input requirements. 
     
     
         3 . The super-power five-cylinder plunger pump according to  claim 1 , wherein the reduction gearbox assembly comprises a planetary reduction gearbox and a parallel reduction gearbox; the parallel reduction gearbox and the planetary reduction gearbox both employ bevel gear transmission; the planetary reduction gearbox comprises one sun gear, four planetary gears and one gear ring, the four planetary gears form a planetary gear mechanism, the sun gear is located at the center of the planetary gear mechanism, the planetary gears and the adjacent sun gear and gear ring are in a normally engaged state; the parallel reduction gearbox comprises a pinion and a bull gear, the pinion is connected to an input end, the bull gear is coaxial with the sun gear of the planetary reduction gearbox, and the reduction gearbox assembly has a transmission ratio of 6.5:1 to 15:1. 
     
     
         4 . The super-power five-cylinder plunger pump according to  claim 1 , wherein a support column of an arch structure is disposed on the spacer frame. 
     
     
         5 . The super-power five-cylinder plunger pump according to  claim 1 , wherein a crosshead mechanism is disposed in the crosshead case, a connecting rod mechanism is disposed in the crankcase and the crosshead case, one end of the connecting rod mechanism is connected to the crankshaft, and the other end of the connecting rod mechanism is connected to the crosshead mechanism, the connecting rod mechanism comprises a connecting rod cap, a connecting rod bearing bush and a connecting rod body, the connecting rod cap is connected to the connecting rod body through bolts, the connecting rod bearing bush is located in a cylindrical space formed by the connecting rod cap being connected to the connecting rod body, each of two sides of the connecting rod bearing bush is provided with a flange structure, and the flange structure has a large width-to-diameter ratio.