An ultra-low temperature pump shaft end mechanical seal device

Abstract

The invention relates to an ultralow-temperature pump spindle end mechanical sealing device. The mechanical sealing device comprises a rotating part and a static part, wherein the rotating part and the static part are located in a pump shell. The rotating part comprises a pump spindle and a moving ring, wherein the pump spindle drives an impeller in the pump shell to rotate, and the moving ring is fixedly arranged on the pump spindle in a sleeving mode. The static part comprises a protecting jacket and a static ring, wherein the protecting jacket is arranged on the pump spindle in a sleeving mode, a clearance is formed between the pump spindle and the protecting jacket, and the static ring is attached to the end face of the moving ring to form a sealing face. An elastic assembly arranged on the protecting jacket in a sleeving mode is arranged between the protecting jacket and the static ring, a clearance is formed between the protecting jacket and the elastic assembly. The static ring is attached to the moving ring under the elasticity effect of the elastic assembly. A first sweeping channel is formed by the clearance between the protecting jacket and the pump spindle, a second sweeping channel is formed by the clearance between the protecting jacket and the elastic assembly, and the first sweeping channel and the second sweeping channel communicate with each other at the end close to the sealing face. The pump shell is provided with a first sweeping through hole communicating with the first sweeping channel and a second sweeping through hole communicating with the second sweeping channel. The frosting and icing phenomena, caused by moisture retention, on the sealing face and the area near the sealing face are effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of ultra-low temperature pumps, and in particular relates to a shaft end mechanical seal device of an ultra-low temperature pump. Background technique [0002] The mechanical seal at the shaft end of the cryogenic pump is the key component of the cryogenic pump and the weak link in the cryogenic pump. The safety and reliability of the mechanical seal directly determines the reliable operation of the cryogenic pump. Cryogenic pumps usually transport liquid oxygen, liquid nitrogen, liquid hydrogen, liquid helium and other ultra-low temperature media. Such media have low temperature and poor lubricity, and the mechanical seal at the shaft end is prone to icing and dry friction and Transition wear. The existing ultra-low temperature pump shaft end seal adopts a conventional seal design, and no targeted measures have been taken for low temperature conditions. The sealing end face and nearby areas are prone to ic...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a mechanical seal device at the shaft end of a cryogenic pump, which can effectively solve the problems of icing, dry friction and transitional wear of the mechanical seal at the shaft end due to water vapor retention

Images