CPC F16J 15/002 (2013.01) [F16J 15/342 (2013.01); F16J 15/3424 (2013.01); F16J 15/447 (2013.01); F16J 15/4472 (2013.01); F16J 15/3448 (2013.01); F16J 15/3452 (2013.01)] | 7 Claims |
1. A sealing device for a gas-liquid two-phase fluid medium under variable working conditions, comprising a rotating shaft and a housing; wherein a chamber formed by the housing is configured to accommodate the gas-liquid two-phase fluid medium;
the sealing device further comprises a labyrinth sealing mechanism and a fluid dynamic-pressure mechanical sealing mechanism, wherein
the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism have a mutually synergetic effect;
sealing buffer chambers are arranged between the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism with double end faces;
the fluid dynamic-pressure mechanical sealing mechanism comprises stationary rings and movable rings, wherein:
each of the stationary rings oppositely abut against one of the movable rings;
the stationary rings are respectively fixed on stationary ring covers formed by the housing through metal sealing rings, respectively;
the movable rings are fixed on the rotating shaft through sealing rings, respectively;
a spring is fixedly connected to pushing rings, and each of the pushing rings oppositely abut against one of the movable rings;
sealing packings are arranged in chambers between the pushing rings, the movable rings and the rotating shaft;
a limiting sleeve is arranged on an outer circumference of the fluid dynamic-pressure mechanical sealing mechanism; and
an isolation sleeve is arranged between the spring and the rotating shaft;
the labyrinth sealing mechanism comprises a plurality of sealing teeth arranged axially, wherein the plurality of sealing teeth are ladder-shaped trapezoidal convex teeth, and ladder-shaped trapezoidal grooves formed by the housing cooperate with the plurality of sealing teeth to form a zigzag sealing channel of the labyrinth sealing mechanism;
a plurality of spiral areas formed by micropore groups are arranged on dynamic-pressure sealing end faces of the stationary rings, each spiral area comprises branch areas adjacent to outer circumferences of the stationary rings and deviated along a rotating direction of the rotating shaft, and the branch areas are formed by the micropore groups;
pore diameters of the micropore groups in the plurality of spiral areas and pore diameters of the micropore groups in the branch areas gradually decrease in a radial direction, and a cross section of a micropore of the micropore groups is one of a trapezoid and a ladder-shaped trapezoid; and
a part of sealing end faces of the movable rings adjacent to outer circumferences of the movable rings have an inclined angle of 3 to 8 degrees from the radial direction.
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