A multi-stage mixing pump for deep sea mining

Abstract

The invention discloses a multi-stage mixed pump for deep sea mining, which comprises a motor connecting frame, a connecting pipe, a submersible motor, a machine-pump connecting frame, an inlet pump cover, a shaft coupling, a rotor component, a first-stage guide body, and an intermediate pump cover 1. Secondary guide body, intermediate pump cover 2. Final guide body, guide bearing, outlet pump cover, cylinder body and pump stop protection device; guide bearing includes guide bearing moving ring and guide bearing static ring, all of which are made of duplex stainless steel As the matrix, a cobalt alloy wear-resistant layer with a thickness of 0.25-0.5mm is laser clad on the outer surface of the moving ring and the inner surface of the static ring; the front cover and the rear cover of the impeller have back blades, and the front cover The number of blades on the back blade is 2 to 3 times the number of blades on the impeller, the outer diameter of the back blade on the rear cover is 0.4 to 0.6 times the outer diameter of the impeller, and the number of blades on the back blade on the back cover is 1.5 to 2 times the number of blades on the impeller . The multistage mixed pump for deep sea mining provided by the invention not only solves the wear problem of the shell of the submersible motor, but also improves the service life of the rotor parts of the mixed pump.

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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