Microgroove double-layer composite groove deep end surface mechanical seal structure

Abstract

The invention discloses a microgroove double-layer composite groove deep end surface mechanical seal structure which comprises a movable ring and a static ring. The movable ring and the static ring are mechanically sealed, a mutual contact surface of the movable ring and the static ring is an end surface, and a microgroove double-layer composite groove deep dynamical pressure groove, a ring groove and a microgroove double-layer composite groove deep pumping groove which are symmetrically distributed along a rotation center are sequentially arranged on the end surface of the movable ring or the static ring from a high pressure side to a low pressure side; the dynamical pressure groove is arranged on the upstream (the high pressure side) of the end surface, the upper layer of the dynamical pressure groove is hollow, and a microgroove shape line on the lower layer of the dynamical pressure groove forms an upstream texture and is same to a dynamical pressure groove shape line on the upper layer; the pumping groove is arranged on the downstream ( the lower pressure side) of the end surface, the upper layer of the pumping groove is hollow, and a microgroove shape line on the lower layer of the pumping groove forms a downstream texture and is same to a shape line on the upper layer of the pumping groove; the upstream texture and the downstream texture are connected through the ring groove; and the inclining direction of the pumping groove is opposite to that of the dynamical pressure groove.

Description

(1) Technical field [0001] This application relates to the technical field of end face mechanical seal design, specifically a double-layer composite groove deep end face mechanical seal structure composed of a dynamic pressure groove, a low-pressure pumping groove and a micro-groove structure at the bottom of the groove, which is suitable for various compressors, pumps, steam turbines and Shaft end seals for shafts of rotating machinery such as kettle stirrers. (2) Background technology [0002] Dry gas seals are more and more widely used in shaft end seals of rotating machinery. However, due to the water vapor contained between the end faces, the end faces fail, which eventually leads to seal failure and becomes an important factor for the failure of rotating machinery. Due to the compressibility of the gas, the temperature of the sealing gas outlet drops, resulting in the precipitation and adsorption of water vapor, which destroys the stability of the gas film on the seal...

AI Technical Summary

Problems solved by technology

[0003] The invention aims to solve the problem of seal failure caused by the condensation of the gas film between the end faces due to the temperature drop in the non-contact seal, and provides a seal that can be applied to various working conditions, especially working conditions such as high pressure, low temperature, and critical phase change of the medium. End structure

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