Permanent magnet motor type low temperature liquid immersed pump structure

Abstract

The invention discloses a permanent magnet motor type low temperature liquid immersed pump structure which comprises a pump shell. The top end of the exterior of a motor shell is fixedly provided witha motor upper end cover, a bearing sleeve is fixedly arranged at the inner top end, and a second-stage outer guide shell is fixedly arranged at the bottom end; a first-stage outer guide shell is fixedly arranged at the bottom end of the second-stage outer guide shell; the top end of a motor sleeve is provided with an exhaust valve, the exhaust valve is located in the motor upper end cover, and aplurality of straight-through flow passages are arranged between the motor sleeve and the motor shell; and a motor rotor is located on the inner side of a motor stator and communicates with a shaft rod, the upper portion is provided with a bearing in a connected manner, and the lower portion is sequentially provided with a bearing, an impeller, an opening ring, an impeller and a liquid guiding wheel in sequence. The permanent magnet motor type low temperature liquid immersed pump structure has the beneficial effects that the friction loss of the inner wall of the flow channel and the fluid resistance loss at the corner can be reduced, the pump efficiency is improved, the liquid pressure of a pump outlet is increased under the same operating parameters of the motor, and the low-temperatureliquid gasification loss is avoided.

Description

technical field [0001] The invention belongs to the technical field of cryogenic pump transportation, and in particular relates to a structure of a permanent magnet motor type cryogenic liquid submersible pump. Background technique [0002] The transfer and pressurization of cryogenic liquids are usually carried out by cryogenic pumps. At present, the cryopumps used in my country are mainly in the form of submersible pumps, and the size and performance efficiency of the pump body are mainly determined by the motor and the flow channel of the extrusion chamber. [0003] The channel resistance and eddy current loss of the submersible pump in the prior art are large, and the effective filtration area of ​​the filter of the pump body is small, resulting in low efficiency of the submersible pump. In addition, the electromagnetic-thermal coupling effect of the motor also significantly reduces the output power of the submersible pump motor. Contents of the invention [0004] Ai...

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Problems solved by technology

[0003] The submersible pumps in the prior art have large channel resistance and eddy current loss, and the effective filtration area of ​​the pump body filter is small, resulting in low efficiency of the submersible pump

In addition, the electromagnetic-thermal coupling effect of the motor also significantly reduces the output power of the submersible pump motor

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