Anti-rotation plate structure with rotation stopping and vibration restraining actions

Abstract

The invention discloses an anti-rotation plate structure with rotation stopping and vibration restraining actions; a stator ring is arranged at the upper stream of an inlet of a rotary seal; the radius of the inner surface of the stator ring is gradually reduced along the axial direction or is decreased first and then increased; the inner surface of the stator ring, a flow deflector and the outer surface of a rotating member form an axially shrinking or convergent-divergent variable cross-section annular fluid channel so that working media are expanded in an accelerative manner when flowing through the channel. For meeting the requirements of an impeller mechanical rotor system on reducing rotational flow of the seal inlet, improving dynamic property of the seal rotor and improving stability of the rotor, the invention provides the anti-rotation plate structure with the rotation stopping and vibration restraining actions, so that the structure can effectively reduce the positive pre-rotation speed of the seal inlet, guides the working media at the seal inlet to rotate reversely and increases the effective damping of the rotary seal, thereby solving the vibration and instability problems of the rotor and improving the stability of the rotor system.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery, and relates to an anti-rotation plate structure, in particular to an anti-rotation plate structure with the functions of anti-rotation, flow guide and vibration suppression, which is used for the rotary seal inlet of impeller machinery. Background technique [0002] In impeller machinery such as steam turbines, gas turbines, pumps and compressors, the rotary seal is installed between the rotating part and the stationary part to control the leakage flow from the high pressure area to the low pressure area through the dynamic and static gap, which has a significant impact on the operating efficiency of the impeller machinery . Currently commonly used rotary seal structures include labyrinth seals, honeycomb seals, hole seals, bag-type damping seals and brush seals. Inlet seal and bulkhead seal, etc. The rotary sealing structure is generally composed of two parts, the sealing stator par...

AI Technical Summary

Problems solved by technology

Although the traditional anti-rotation plate 3 can reduce the swirling flow velocity at the seal inlet to a certain extent, the effect is limited, and it cannot fundamentally improve the dynamic characteristics of the rotating seal rotor and solve the problem of rotor vibration instability

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