Vertical multistage vacuum low-temperature immersed pump

Abstract

A vertical multi-stage vacuum cryogenic submersible pump, mainly composed of a motor part, a pump head part, a rotor shaft, a bearing seat, a piercing rod, and a pump pool; the bearing seat supports the rotor shaft through a bearing, and the upper end of the rotor shaft is equipped with a motor The part and the lower end are equipped with the pump head part, and the motor part and the pump head part are connected as a whole through the rod and placed in the closed pump pool. The pump motor adopts superconducting motor, the motor does not generate heat, does not affect the gasification of LNG and the lubrication of the bearing, the electromagnetic characteristics are not affected by temperature, and there is no magnetic current loop; the motor is equipped with a displacement sensor, which can monitor the floating amount of the rotor Perform real-time monitoring. As a wearing part, the bush bearing seat can be replaced at any time, easy to process, can reduce maintenance and reduce operating costs. Setting the first-stage bushing between the inducer and the impeller can achieve the best match between the inducer and the impeller, and can improve the head and efficiency of the pump set. The pump is reasonable in structure, high in performance and cheap in price, and is an ideal submersible pump in a low-temperature tank.

Description

technical field [0001] The invention relates to a centrifugal pump device applied in the technical field of LNG, in particular to a vertical multistage vacuum cryogenic submersible pump suitable for transporting low-temperature medium. Background technique [0002] LNG is the abbreviation of liquefied natural gas (liquefied natural gas). The main component is methane. LNG is colorless, odorless, non-toxic and non-corrosive. The development of liquefied natural gas (LNG) industry has become a major measure to adjust energy composition, alleviate dependence and pressure on oil supply, and ensure my country's energy security. In the entire LNG industry chain, cryogenic submersible pumps will be used in all links of output, transshipment, reception, utilization, etc., which makes LNG cryogenic transport pumps play a pivotal role in the industry chain. The submersible pump for LNG pump pool is a kind of core power for transporting liquefied natural gas and related cryogenic li...

AI Technical Summary

Problems solved by technology

Therefore, the design of this kind of pump is difficult, and it is difficult to manufacture and test. Therefore, at present, domestic submersible pumps of this kind in cryogenic tanks all rely on imports, resulting in problems such as expensive products and high operating costs.

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