Marine vertical deep well liquid cargo pump

Abstract

The invention discloses a marine vertical deep well liquid cargo pump which comprises a motor component, a bearing component, a mechanical seal, an exit section, a support pipe, a middle support frame, a shaft, a shaft connecting component, a multistage flow guide housing, an impeller, an inducer, a suction section and the like, wherein a gaseous cold insulation cavity and a buffer cavity are sequentially arranged between the mechanical seal and the exit section from the top down to form two mechanical seal protection barriers; a multipoint sliding bearing support is arranged between a pump rotor and a casing; a middle limiting component is arranged in the middle of the pump; a bottom end limiting component is arranged at the undermost end of the pump; deviation of the whole pump due to swaying is avoided; the support pipe capable of sliding up and down is arranged at a shaft connecting part of a lower shaft; the shaft connecting component is dismounted by using a vacated space; and further, a whole lower shaft component can be taken out for maintenance. According to the pump, the service life of the seal can be prolonged, the swaying of the pump is avoided, the pump is convenient to dismount, as well as operates stably and is safe and reliable and long in service life under the working condition of length being 20m and working temperature being subzero 165 DEG C when liquid is pumped, and the pump is applicable to conveying LNG (Liquefied Natural Gas), LEG (Liquid Ethylene Gas) and LPG (Liquefied Petroleum Gas).

Description

technical field [0001] The invention relates to a marine liquid cargo pump, in particular to a marine vertical deep well liquid cargo pump suitable for transporting LNG, LEG, LPG (Liquid Natural Gas, Liquid Ethylene Gas, Liquid Petrol Gas). Background technique [0002] At present, ordinary vertical multi-stage pumps cannot meet the special working conditions of LNG, LEG, and LPG tankers for unloading. During the unloading process, there will be some swaying. During the swaying process of the hull, the inner part of the pump tank will have a large radial displacement and a certain acceleration, which will easily lead to the wear-resistant ring of the rotor and the wear-resistant ring of the shell. Collision and eccentric wear affect the smooth operation of the pump; the minimum temperature of the conveyed medium is -165°C, and the medium is in direct contact with the sealing element, which will lead to the failure of the sealing element and leakage of the medium, leaving a s...

AI Technical Summary

Problems solved by technology

[0002] At present, ordinary vertical multi-stage pumps cannot meet the special working conditions of LNG, LEG, and LPG tankers for unloading. During the unloading process, there will be some swaying. During the swaying process of the hull, the inner part of the pump tank will have a large radial displacement and a certain acceleration, which will easily lead to the wear-resistant ring of the rotor and the wear-resistant ring of the shell. Collision and eccentric wear affect the smooth operation of the pump; the minimum temperature of the conveyed medium is -165°C, and the medium is in direct contact with the sealing element, which will lead to the failure of the sealing element and leakage of the medium, leaving a safety hazard for the safe operation of the tanker; The overall length of the pump is too long. In the process of maintenance and overhaul, if you need to replace the wear-resistant ring, impeller and other components, you need to lift the pump as a whole, which is extremely inconvenient

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