Pump head device

Abstract

The invention discloses a pump head device and belongs to the field of pumps. The pump head device comprises a column-shaped outer shell, a column-shaped inner shell, a pump shaft and an impeller; the column-shaped inner shell is coaxially arranged in the column-shaped outer shell, and a flow guiding gap is formed between the outer wall of the column-shaped inner shell and the inner wall of the column-shaped outer shell; the first end of the pump shaft is located on the exterior of the column-shaped inner shell, and the second end of the pump shaft is located in the column-shaped inner shell; and the impeller is coaxially arranged at the first end of the pump shaft, a first guiding blade which extends outwards spirally with the impeller as the center is arranged at the end, close to the impeller, of the column-shaped inner shell, and a plurality of second guiding blades are arranged on the outer side wall of the column-shaped inner shell and circumferentially arranged around the pump shaft in an array mode. Liquid is tossed out from the impeller and then continues to spirally flow under the effect of the first guiding blade, the movement direction of the liquid is gradually converted into spiral flowing in the axial direction of the pump shaft, and thus impacting of the liquid on the column-shaped outer shell is reduced, so that vibration of an LNG immersed pump is reduced, and the efficiency of the LNG immersed pump is improved.

Description

technical field [0001] The invention relates to the field of pumps, in particular to a pump head device. Background technique [0002] LNG (Liquefied Natural Gas, liquefied natural gas) carrier is a special ship for transporting liquefied natural gas whose temperature is lower than -162°C. LNG submersible pumps are required in all aspects of LNG storage, output, and reception. The main structure of the LNG submersible pump is the pump head device, and the structure of the pump head device has a great influence on the efficiency of the LNG submersible pump. [0003] The pump head device of the existing LNG submersible pump mainly includes a cylindrical outer shell and a cylindrical inner shell sleeved together, and a diversion gap is left between the inner side wall of the cylindrical outer shell and the outer side wall of the cylindrical inner shell. A pump shaft is inserted into the cylindrical inner shell, and the impeller is coaxially connected to the pump shaft. The ou...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing LNG submersible pump has relatively large vibration and low efficiency, the embodiment of the present invention provides a pump head device

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