Centrifugal pump impeller and LNG (Liquefied Natural Gas) immersed pump comprising same

Abstract

The invention belongs to the field of centrifugal pump type mechanical devices, and specifically relates to a centrifugal pump impeller. The centrifugal pump impeller comprises a front cover plate, arear cover plate, main blades and splitter blades, wherein the main blades and the splitter blades are obliquely arranged between the front cover plate and the rear cover plate; the main blades and the splitter blades are centrifugally uniformly distributed and alternatively arranged; the main blades are longer than the splitter blades; a spiral passageway is formed between every two adjacent blades; the main blades and the splitter blades gradually narrow from an inlet to an outlet. The invention also discloses an LNG (Liquefied Natural Gas) immersed pump comprising the abovementioned centrifugal pump impeller. With the adoption of the centrifugal pump impeller and the LNG immersed pump, the efficiency and the cavitation erosion performance can be improved under the condition that the flow rate and the lift of the LNG immersed pump is ensured; and meanwhile, the centrifugal pump impeller and the LNG immersed pump have the advantages of being simple in structure, convenient to process,and low in cost.

Description

technical field [0001] The invention belongs to the field of centrifugal pump mechanical devices, and more specifically relates to a centrifugal pump impeller and an LNG submerged pump including the centrifugal pump impeller. Background technique [0002] LNG (liquefied natural gas) submersible pumps are widely used in the pressurized transfer of LNG, with good air tightness and low temperature resistance. At present, domestic LNG-related enterprises all use foreign LNG submersible pumps, which cost a lot, and maintenance and related technical services are not timely and in place, which seriously affects the development of my country's LNG enterprises and also affects my country's natural gas supply. [0003] However, further studies have shown that when the LNG submersible pump is immersed in the LNG in a saturated state, a slight pressure drop or temperature rise may cause the vaporization of the LNG, and then form cavitation in the pump body. Cavitation can cause serious...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a centrifugal pump impeller and an LNG submersible pump including the centrifugal pump impeller, wherein the impeller is easy to be cavitated and has high requirements for the head, and the corresponding design Centrifugal pump impeller, the centrifugal pump is used for LNG submersible pump, and the specific structure and arrangement of each component in the LNG submersible pump are studied and designed, which can effectively solve the problem that the impeller of the LNG submersible pump is easily damaged. Problems such as cavitation, insufficient efficiency and head, etc., have the advantages of simple structure, convenient processing, low cost, etc.

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