Scroll gas-liquid multiphase mixing transmission pump

Abstract

The invention discloses a scroll gas-liquid multiphase mixing transmission pump composed of a movable scroll pan, a fixed scroll pan, a frame body, a crankshaft, and a small crank anti-rotation mechanism; the movable scroll pan and the fixed scroll pan with the same shaped wires relatively rotate 90 degrees, and are offset for certain distance, and then the movable scroll pan and the fixed scroll pan are inserted into each other to form a plurality of working cavities; under the driving of the crankshaft, the movable scroll pan realizes revolution and translation with the fixed scroll pan under the constraint of the anti-rotation mechanism of the small crank so as to form the working cavity volume with cyclic variation, and the absorption, compression and discharging of gas-liquid medium are realized. The movable scroll pan and the fixed scroll pan are both provided with a section of variable back lash scroll wrap composed of reducing base circle involute; during working, back lash exists, so that a pressure relief path exists in the discharging port direction from a compression cavity; in the pressurizing process, a small quantity of gas-liquid medium generates internal leakage via the path from the compression cavity to the discharging port so as to realize random unloading for liquid phase compression, which solves the problems that pressure surge and liquid impact are easy to appear during pressurizing mixing transmission gas-liquid medium when liquid holdup is higher.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a scroll type gas-liquid multiphase mixed transport pump. Background technique [0002] With the gradual expansion of oil and natural gas production from land to desert and ocean, the long-distance reliable transportation of multiphase mixtures of crude oil, gas and water produced in oil wells has gradually become a research hotspot. Mixed transportation is the development trend of today's oil and gas transportation technology. It has the advantages of simplifying the process, saving costs and improving oil recovery. Therefore, the research on new gas-liquid multiphase mixed transportation pumps is of great significance. [0003] There are many types of gas-liquid multiphase mixed transportation pumps, and the most widely used ones in oil and gas gathering and transportation systems are screw axial flow multiphase pumps and twin-screw multiphase pumps. ...

AI Technical Summary

Problems solved by technology

The spiral axial flow multiphase pump uses multiphase fluid to obtain kinetic energy in the high-speed rotating impeller, and then converts the kinetic energy into pressure energy through the diffusion effect of the guide vane; the pump is mainly composed of a suction unit, a compression unit, an extrusion unit and a pump It has the advantages of simple structure and convenient operation; but when the gas content is large, its working performance is greatly affected, and the pumping head is small, so the screw axial flow multiphase mixed pump is difficult to adapt to Mixed pressurized conveying when the gas fraction is large

The twin-screw multi-phase pump relies on the mutual meshing between the two screws to form a periodically changing working chamber volume, and then realizes the pressurized and mixed delivery of gas-liquid multi-phase fluid. It has the advantages of compact structure and high efficiency. Larger multiphase fluids, high freezing point and high viscosity mixtures have better pressurization effects, and are suitable for small and medium flow and high head conditions; but as positive displacement multiphase pumps, due to the lack of better solution to liquid phase compression Random unloading, when the liquid content is high, the pressure in the working chamber will be unbalanced during operation, the medium pressure in a few working chambers will increase suddenly, and even liquid shock will occur, which will seriously affect the safe and reliable operation of the multiphase pump. The twin-screw multi-phase mixed pump is not suitable for mixed pressurized transportation when the liquid content is high

[0004] Scroll machinery has a history of more than 100 years of development. It has significant advantages such as high efficiency, high reliability and simple structure. It has been widely used as refrigeration compressors, aerodynamic compressors, superchargers and vacuum pumps. However, domestic However, there is no relevant report on the scroll multiphase pump

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