Multi-stage multiphase pump for deep sea mining

Abstract

The invention discloses a multi-stage multiphase pump for deep sea mining. The multi-stage multiphase pump comprises a motor connecting frame, connecting pipes, a submersible motor, a pump connectingframe, an inlet pump cover, a coupler, a rotor component, a first-stage flow guide body, a middle pump cover I, a second-stage flow guide body, a middle pump cover II, a final-stage flow guide body, aguide bearing, an outlet pump cover, a barrel and a pump stop protection device, wherein the guide bearing comprises a guide bearing moving ring and a guide bearing static ring, duplex stainless steel is adopted as a base body of the guide bearing moving ring and the guide bearing static ring, and the outer surface of the moving ring and the inner surface of the static ring are each provided witha cobalt alloy wear-resisting layer with the thickness of 0.25-0.5 mm in a laser cladding mode; and both a front cover plate and a rear cover plate of an impeller are provided with back blades, the number of the back blades of the front cover plate is 2-3 times that of the blades of the impeller, the outer diameter of the back blades of the rear cover plate is 0.4-0.6 time that of the impeller, and the number of the back blades of the rear cover plate is 1.5-2 times that of the blades of the impeller. According to the multi-stage multiphase pump for deep sea mining, the problem of abrasion ofa submersible motor shell is solved, and the service life of the rotor component of the multiphase pump is also prolonged.

Description

technical field [0001] The invention belongs to the field of fluid machinery, and in particular relates to a multistage mixed pump for deep sea mining. Background technique [0002] As a strategic resource for the development of high-tech, deep-sea mineral resources are of great significance to alleviating the supply pressure of my country's mineral resources and increasing the degree of protection of my country's strategic resources. According to the technical characteristics of deep-sea mineral resources development, the deep-sea ore resource development system that has the most industrial mining prospects is currently recognized as a hydraulic lifting mining system. Lift ore through pipelines to surface mining ships. The mixed pump provides power for the entire conveying system and is one of the key equipment of the hydraulic lifting mining system. [0003] The mixed pump for deep-sea mining is a typical solid-liquid two-phase flow pump, and a large amount of solid ore ...

AI Technical Summary

Problems solved by technology

[0003] The mixed pump for deep-sea mining is a typical solid-liquid two-phase flow pump, and a large amount of solid ore will be mixed in during operation. Wear and tear is not conducive to the promotion and use of commercial deep sea mining in the future

In addition, the front cover of the multi-stage impeller does not use back blades, and fine ore can easily enter the impeller mouth ring through the gap between the front cover and the pump cover. On the one hand, the gap between the mouth ring will increase and the pump efficiency will decrease. On the one hand, it will cause the imbalance of axial force, which will damage the pump flow parts and cause the mixed pump to fail to work normally.

[0004] After retrieval, CN201810072787.0 discloses a multi-stage deep-sea mixed transport pump, CN201810073869.7 discloses a multi-stage deep-sea mixed transport pump with an axial force transmission structure, and CN201810073296.8 discloses a multi-stage deep-sea mixed transport pump with a shaft sleeve structure. The multi-stage deep-sea mixed-transport pump solves the problems of the existing centrifugal multi-phase mixed-transport pump under the condition of high gas content, such as low operating efficiency and service life of the pump shaft. However, the deep-sea mixed-transport pump is suitable for transporting deep-sea oil, Gas resources have great limitations in the transportation of solid-liquid two-phase flow media containing deep-sea ores

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