Influence of surface texture parameters of screw pump rotor on tribological properties of its friction pairs

Wang, Meiling; Li, Qin; Huang, Zhiqiang; Qian, Weiji; Chen, Xiong; Li, Qiang; Lai, Tianhua

doi:10.1108/ilt-09-2021-0390

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…In addition to the effects of different lubricating mediums, the structure of the surface also plays a crucial role. The surface texture can be a tool to keep the lubricating medium in the contact area during idling (the depressions into the texture act as reservoirs for the lubricant) and as a low-pressure channel into the contact area at very low sliding speeds, 51,52 thus reducing drag, improving lubrication, and enhancing starting performance. During the wear process, the textured pits collect and hold the friction debris to prevent it from contributing to wear, thereby weakening the plowing effect caused by this debris.…”

Section: Influence Of Texture Area Ratio and Lubricating Medium On We...mentioning

confidence: 99%

Study of the effect of laser textured rotors on the starting performance of metal–rubber mating pairs under different lubricating media environments

Wang,

Huang,

Qian

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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To solve the problem of premature failure of the rubber stator of the screw pump due to wear, reduce the frictional resistance torque of the screw pump to solve the problem of difficulty in starting after the shutdown of the screw pump production system in Daqing Oilfield. The effects of micron dot texture and lubricating medium on the tribological properties of 42CrMo metal and acrylonitrile–butadiene rubber mating surfaces were studied by theoretical analysis and tribological tests. The friction coefficient, wear amount, and rubber wear morphology were used as the measurement indexes of drag reduction, wear resistance, and wear degree, respectively. The results showed that the best combination of texture area ratio and the lubricating medium was 10% silicone grease, the friction coefficient and wear amount were reduced by 11% and 10.7%, respectively, compared with untextured, and the main order of chip storage and oil supply effect was 10% > 5% > 15%.

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Section: Influence Of Texture Area Ratio and Lubricating Medium On We...mentioning

confidence: 99%

Study of the effect of laser textured rotors on the starting performance of metal–rubber mating pairs under different lubricating media environments

Wang,

Huang,

Qian

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Lubrication Characteristics of a Warhead-Type Irregular Symmetric Texture on the Stator Rubber Surfaces of Screw Pumps

Liu,

Sun,

Liu

et al. 2024

Lubricants

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A theoretical model for the micro-texture on the inner wall of the stator rubber in screw pumps was developed. The finite element analysis method was employed. The pressure and streamline distributions for warhead-type, concentric circle-type, and multilayer rectangular-type textured surfaces were calculated. The effects of textured morphology, groove depth, groove width, and other parameters on the lubrication field were systematically investigated and analyzed. A nanosecond laser was employed to process the textured rubber surface of the stator in the screw pump. Subsequently, a micro-texture friction performance test was conducted on the rubber surface of the stator in actual complex well fluids from shale oil wells. Given the results of the simulation analysis and experimental tests, the lubrication characteristics of textured rubber surfaces with varying texture morphologies, rotational speeds, and mating loads were revealed. Furthermore, it indicated that the irregular symmetric warhead-type micro-texture exhibited excellent dynamic pressure lubrication performance compared with concentric circle-type and multilayer rectangular-type textures. The irregular symmetry enhanced the dynamic pressure lubrication effect, enhanced the additional net load-bearing capacity of the oil film surface, and reduced friction. As the groove depth increased, the volume and number of vortices within the groove also increased. The fluid kinetic energy was transformed into vortex energy, leading to a reduction in wall stress on the surface of the oil film, thereby affecting its bearing capacity. Initially, the maximum pressure on the wall surface of the oil film increased and then decreased. The optimal dynamic pressure lubrication effect was achieved with a warhead-type texture size of 3 mm, a groove width of 0.2 mm, and a groove depth of 0.1 mm. Well-designed texture morphology and depth parameters significantly enhanced the oil film-bearing capacity of the stator rubber surface, improving the dynamic pressure lubrication effect, and consequently extending the service life of the stator–rotor interface in the screw pump.

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Study on the Tribological Properties of Multilayer Concentric Hexagonal Laser Texturing on Rubber Surfaces of Screw Pumps

Liu,

Niu,

Liu

et al. 2024

Materials

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Given the friction and drag reduction effects observed in various biological hexagonal structures in nature, a new design was implemented on the rubber surface of the stator of a submersible screw pump. This design featured a multilayer concentric hexagonal groove structure. Furthermore, a composite multilayer hexagonal structure integrating grooves and pits was also developed and applied. This study investigated the influence of groove layer number, groove depth, pit depth, and multilayer hexagonal groove texture arrangement on the rubber surface flow characteristics. Additionally, the pressure field state, the degree of influence on the oil film-bearing capacity, and the biomimetic and hydrodynamic lubrication theories were tested using the finite element analysis method. Tribological experiments were conducted on nanosecond laser-processed rubber textures under simulated liquid lubrication conditions, reflecting actual shale oil well experiments. These experiments aimed to investigate the influence of multilayer hexagonal shape parameters on the tribological characteristics of the stator-rotor friction pair of a submersible screw pump. The results indicated that with a constant overall size, a multilayer hexagonal structure with ~0.1 mm groove depth enhanced the oil film-bearing capacity, providing significant friction and drag reduction. For composite textures, a deeper pit depth within the study area enhanced the oil film-bearing capacity. Furthermore, a gradient arrangement of groove textures featuring wider outer grooves and shallower depth exhibited superior performance in terms of bearing capacity.

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Influence of surface texture parameters of screw pump rotor on tribological properties of its friction pairs

Cited by 4 publications

References 24 publications

Study of the effect of laser textured rotors on the starting performance of metal–rubber mating pairs under different lubricating media environments

Study of the effect of laser textured rotors on the starting performance of metal–rubber mating pairs under different lubricating media environments

Lubrication Characteristics of a Warhead-Type Irregular Symmetric Texture on the Stator Rubber Surfaces of Screw Pumps

Study on the Tribological Properties of Multilayer Concentric Hexagonal Laser Texturing on Rubber Surfaces of Screw Pumps

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