Efficient LNG conveying pump impeller

Abstract

The invention discloses an efficient LNG conveying pump impeller. The efficient LNG conveying pump impeller comprises a flow guide part, and a pressurizing part which is connected to the flow guide part, wherein the flow guide part comprises a first hub, and a plurality of first spiral blades which are uniformly distributed on the first hub; the first blades are connected to the first hub throughfirst connecting surfaces; the pressurizing part comprises a first cover plate assembly, a second cover plate assembly, and a second hub which is formed on the second cover plate assembly; second blades are uniformly distributed in the circumference a spiral flowing channel is formed between every two adjacent second blades; and the second hub is connected to the first hub. With the adoption of the efficient LNG conveying pump impeller, the inlet flowing area is effectively increased, so that an inlet is effectively prevented from blockage, and eddy current is effectively prevented from generating in a turbine flowing channel; the flow guide part and the pressurizing part are designed, so that the whole conveying pump impeller has the beneficial effects of being low in gas etching, high inefficiency, and simple to process.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to an impeller of a high-efficiency LNG delivery pump. Background technique [0002] The present invention requires that the blade inlet m is 0, t is -0.2-0.4; the blade outlet m is 0.56-0.73, and t is 2.3. This is used to determine the shape of the booster impeller. The share of natural gas in energy consumption has steadily increased in recent years. The transportation and storage of natural gas are basically converted into LNG (liquefied natural gas). LNG pump is an important equipment of LNG filling station, mainly used for pressurization and unloading work. The impeller is an important part of the LNG pump. In order to avoid blockage of the impeller inlet and ensure the number of blades to prevent eddy currents in the impeller channel, the traditional method is to use a combination of long and short blades. This method requires high processing. The manufacture is di...

AI Technical Summary

Problems solved by technology

The impeller is an important part of the LNG pump. In order to avoid blockage of the impeller inlet and ensure the number of blades to prevent eddy currents in the impeller channel, the traditional method is to use a combination of long and short blades. This method requires high processing. Difficult to make, high production cost, and the dynamic balance of the impeller is not easy to control, the water loss of the fluid on the impeller is relatively large, which will reduce the efficiency of the pump

At the same time, because the rotation speed of the LNG delivery pump is generally around 6000r / min, which is extremely high, the flow velocity of the medium in the flow field between the blades increases proportionally, and the diffusion of the medium in the flow field is intensified, causing part of the LNG to gasify and forming a large number of bubbles, which together with the LNG After the impeller does work, the pressure rises, the bubbles burst, and cavitation is formed, which is extremely harmful to the impeller.

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