Low-temperature deep-well pump

Abstract

The development trend of a marine low-temperature deep-well pump is that the marine low-temperature deep-well pump is reliable at low temperature, necessary net positive suction head is low, efficient and energy-saving effects are achieved, and maintaining is convenient. According to the current status and the development trend, the structural design is broken through for the SCW low-temperature deep-well pump, a high-pressure self-tightening structure design is adopted, and magnetic suspension bearings are adopted. New material, such as high polymer material, is used so that the characteristics of safety, reliability, corrosion and leakage resistance and vibration and noise reduction of the marine low-temperature deep-well pump can be enhanced. In detail, a multi-stage impeller structure is adopted for achieving high lift, a mature inclined outlet deep-well pump hydraulic model is adopted, and a pump inlet is matched with an inducer, so that an expected hydraulic performance is achieved; a stainless steel casting, a stainless steel shaft, a PTFE sealing element, a graphite sliding bearing and other materials are used for being adaptive to the low-temperature environment below 104 DEG C; a mechanical seal cavity is matched with a booster, meanwhile, the gas pressure reduction effect of an upper sliding bearing is used so that it can be guaranteed that pumped liquid does not leak outwards in the high-pressure operation process of the pump, and safety can be guaranteed; a shutdown seal design is adopted so that the pumped liquid can not leak outward in the maintaining process of the pump, and then environment safety can be guaranteed. Pipe segmenting, pipe flange connection and shaft hard coupler connection are used for reaching the 5 m-22 m depth below the liquid.

Description

Technical field: [0001] The invention relates to a marine low-temperature deep well pump, which is used for transporting liquid under the sea surface. Background technique: [0002] Deep well pumps are widely used on ships due to their advantages of less basic equipment requirements, less influence from the external environment, self-priming problem solving and convenient maintenance, and since most marine deep well pumps are used in very important positions, most of them require classification society certification . For example, the application media include water, lubricating oil, natural and liquefied gas, chemical raw materials and CO2, etc. The commonly used flow range is 150m3 / h to 800m3 / h. At present, the lift of marine LNG deep well pumps is mostly 120m. Most of the current cryogenic deep well pumps use centrifugal impellers, and the efficiency is not the highest. It is difficult to disassemble and assemble the cylinder, which is not convenient for maintenance. ...

AI Technical Summary

Problems solved by technology

[0053] Enhancing the smoothness and streamlined shape of the flow channel at the impeller inlet can reduce its resistance loss, thereby enhancing the anti-cavitation performance of the centrifugal pump, but the production of high smoothness and strong streamlined flow channel requires too much material and manufacturing technology. Requires higher cost input

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