High-temperature and high-pressure vertical pipeline pump

Abstract

A high-temperature and high-pressure vertical pipeline pump comprises an overflowing unit, a sealing unit and a rotating shaft unit, the overflowing unit is connected with an input pipe and an output pipe and provides flowing power for media in a pipeline, and the sealing unit is arranged between the overflowing unit and the rotating shaft unit. The connecting unit is connected with the overflowing unit and the rotating shaft unit and isolates the overflowing unit from the rotating shaft unit, the rotating shaft unit comprises a pump shaft, one end of the pump shaft is connected with a centrifugal impeller arranged in the overflowing unit, the other end of the pump shaft is connected with a driving device, and the driving device drives the centrifugal impeller to rotate through the pump shaft. The medium passing through the pipeline pump is made to flow. The pipeline pump can convey media with the temperature ranging from 230 DEG C to 370 DEG C, the inlet pressure ranges from 8 MPa to 12 MPa, and the outlet pressure is larger than or equal to 12 MPa.

Description

technical field [0001] The invention relates to the field of pipeline pump manufacturing, in particular to the above-mentioned high temperature and high pressure vertical pipeline pump. Background technique [0002] Conventional vertical pipeline pumps have the characteristics of simple structure and light weight, and are mainly used in various fields of clean water and pipeline transportation such as industrial and urban water supply and drainage, high-rise building pressurized water supply and fire pressurization. However, in the above application fields, there is basically no need to consider the harsh working conditions of high temperature and high pressure. The conventional vertical pipeline pump only needs to consider the economy and practicability of the product, and it is not considered in the refining and hydrocracking systems. The need to withstand high temperature, high pressure and other conditions makes conventional vertical pipeline pumps unable to meet the req...

AI Technical Summary

Problems solved by technology

The temperature of the conveying medium is 230℃~370℃, the inlet pressure is 8~12MPa, and the outlet pressure is ≥12Mpa. In the range from the minimum continuous stable flow rate to the maximum rated flow rate, the difference between NPSHa and NPSHr is ≤2m. This harsh working condition is conventional vertical pipeline The pump simply increases the thickness of the pressure-bearing wall or the water cooling of the outer cladding bearing is not enough. After a period of use, the flow rate, lift and efficiency of the above-mentioned improved conventional vertical pipeline pump will all decrease, and cavitation and vibration will occur at the same time. and other phenomena

Due to the high temperature of the medium and the high inlet pressure, the gap between the mouth ring and the friction pair will become smaller due to temperature expansion, the service life of the bearing will be shorter, and the temperature of the oil chamber of the bearing box will be high. The equipment will be damaged in a short time and cannot operate normally. , seriously affecting the safe operation and production of the device

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