Well drilling five-cylinder pump and method for installing helical gears thereof

Abstract

The invention discloses a five-cylinder pump and a method for installing helical gears thereof. The five-cylinder pump comprises a framework, a crankshaft, a motor and a pinion shaft; the crankshaft is arranged on the framework, and the pinion shaft is connected with the motor; pinions are arranged at two ends of the pinion shaft; bearings for supporting the crankshaft are arranged on the crankshaft of the five-cylinder pump; the two helical gears are arranged at two ends of the crankshaft, turning directions of teeth of the helical gears are opposite to each other, and the helical gears are connected with the crankshaft by expansion sleeves; stepped holes are formed in the end surfaces of the helical gears, large holes of the stepped holes are expansion sleeve mounting holes, and small holes of the stepped holes are crankshaft mounting positioning holes and are positioned in the inner end surfaces of the helical gears; pressure plates are arranged on the outer end surfaces of the helical gears, are connected with the helical gears by bolts and are abutted to bolts on the outer end surfaces of the expansion sleeves; kidney-shaped holes are formed in the end surfaces of the helical gears, and bolts penetrate the kidney-shaped holes to connect the helical gears with the crankshaft; the helical gears on the crankshaft are in mesh transmission with the pinions. The five-cylinder pump and the method have the advantages that the five-cylinder pump is small in size, long in service life and convenient to disassemble and assemble.

Description

technical field [0001] The invention relates to oil and natural gas drilling equipment and an installation method thereof, in particular to a five-cylinder pump for drilling and a method for installing helical gears of the five-cylinder pump. Background technique [0002] At present, the drilling pumps used in oil fields at home and abroad are almost all three-cylinder drilling pumps. Traditional three-cylinder drilling pump such as figure 1 As shown: Herringbone gear transmission is usually adopted, and the transmission structure mainly includes pinion shaft 03, pinion gear 01, crankshaft 07 and herringbone gear 05; pinion gear 01 is set in the middle of pinion shaft 03, and the two ends of pinion shaft 03 A support bearing 02 is provided to support the pinion shaft 03 on the frame 04, and the pinion shaft 03 is also connected with the motor (not shown in the figure). The two ends of the crankshaft 07 are provided with support bearings 06 to support it on the frame 04. T...

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Problems solved by technology

[0004] (1) Since the herringbone gear 05 is far away from the support bearing 06 at both ends of the crankshaft 07, the support bearing 06 is subjected to a large force during operation and has a short service life;

[0005] (2) Since the herringbone gear 05 is far away from the support bearings 06 at both ends of the crankshaft 07, the shear stress, torque and bending moment on the crankshaft 07 are relatively large. The pinion 01 on the gear shaft 03 is not well meshed; in order to increase the stiffness and strength of the crankshaft 07, people often need to increase the diameter of the crankshaft 07, which results in a large volume and high cost of the drilling pump;

[0006] (3) Since the herringbone gear 05 is arranged in the middle of the crankshaft 07, the space occupied by the herringbone gear 05 is relatively large, and the cylinder spacing of the entire three-cylinder pump cannot be reduced, resulting in a traditional drilling pump with large volume, heavy weight and high cost;

[0007] (4) The phase difference of the three-cylinder pump is 120 degrees, and the pulsation is large, which will cause a large vibration to the drilling site

[0010] 1. The gear and the crankshaft are connected by a key, and the gear is difficult to install and disassemble;

[0011] 2. Since two pairs of gears are used to synchronously drive the crankshaft, it is required that the two pairs of gears have good synchronous meshing. It is not convenient to adjust the clearance of the gear pairs in the circumferential direction by using key connections, and it is difficult to achieve synchronous meshing of the two pairs of gears:

[0012] 3. After the gear is installed on the crankshaft, in order to ensure the synchronous meshing of the gear pair, it is often necessary to continuously grind the connecting key to meet the assembly requirements. The grinding of the connecting key not only requires highly skilled assembly workers, but also requires would waste a lot of time

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