Self-vacuum heat insulation pump used for conveying low-temperature liquid

Abstract

The invention provides a self-vacuum heat insulation pump used for conveying low-temperature liquid. The self-vacuum heat insulation pump comprises a shell, a self-vacuum heat insulation shell, a bearing located in the shell, a main shaft supported on the bearing, a motor installed on the main shaft and an impeller installed at the end of the main shaft, wherein the heat insulation shell is weldedto the outer side of the shell to form a self-vacuum structure, the bearing comprises a front bearing body and a rear bearing body, the front bearing body and the rear bearing body are both providedwith a through hole, the main shaft is supported on the front bearing body and the rear bearing body, the motor comprises a superconducting excitation pole rotor and a superconducting armature windingstator, and the impeller is installed at the end, close to an inlet of the low-temperature liquid, of the main shaft. Temperature difference does not exist between the bearing and the impeller, in this way, the axial heat conduction amount of a centrifugal pump is greatly reduced, and thus the loss of cooling capacity is small. In the meanwhile, the bearing can reliably work for a long term, andthe working temperature of the superconducting motor is kept below the superconducting critical temperature. The self-vacuum heat insulation pump used for conveying the low-temperature liquid can be widely applied to the field of conveying of the low-temperature liquid.

Description

technical field [0001] The invention relates to the technical field of cryogenic liquid transportation, in particular to a self-vacuum adiabatic pump for conveying cryogenic liquid. Background technique [0002] Cryogenic technology has made great progress in recent years. The use of cryogenic liquids, such as liquid nitrogen, liquid hydrogen, and liquid helium, shows a trend of diversification and continuous growth. In the industrial chain of cryogenic liquids such as liquid nitrogen, liquid hydrogen, and liquid helium, cryogenic liquid pumps are required for transportation and pressure boosting in all links of production, transportation, and use. There are two types of cryogenic liquid pumps used today, one is a conventional cryogenic liquid pump with a motor in a normal temperature zone, and the other is a cryogenic submersible pump or a pipeline pump with a motor in a low temperature zone. [0003] The pump body of a conventional low-temperature liquid pump whose motor...

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Problems solved by technology

[0004] The inventors found that the cryogenic submersible pump or pipeline pump still has the following problems: 1) The cryogenic pipeline pump is connected to the cryogenic insulation pipeline, and the cryogenic fluid circulates in the pump, so there is a heat insulation problem; 2) The motor immersed in the cryogenic liquid runs The heat brought by it will be absorbed by the low-temperature liquid pumped by it, causing it to vaporize due to energy absorption; 3) The bearing immersed in the low-temperature liquid also generates heat, resulting in loss of cooling capacity and reducing the reliability of the bearing

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