| CPC F01D 11/001 (2013.01) [F01D 11/003 (2013.01); F05D 2240/55 (2013.01)] | 4 Claims |
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1. A turbine shaft sealing device provided in a turbine for suppressing leakage of a working fluid between a rotary part that rotates around a rotation center axis by the working fluid, and a lower half stationary part and an upper half stationary part that are arranged to annularly surround the rotary part and that adhere to each other at respective horizontal joint surfaces, the turbine shaft sealing device comprising:
a packing ring lower half part and a packing ring upper half part configuring an annular packing ring having a hook and an inner peripheral ring part, the hook engaging with a hook engagement annular groove that is formed along a circumferential direction on the lower half stationary part and the upper half stationary part, the inner peripheral ring part having at least one seal fin that protrudes toward a surface of the rotary part and that is formed along the circumferential direction, wherein:
the packing ring lower half part is stationarily supported by the lower half stationary part;
the packing ring lower half part has:
a lower half center segment arranged at a center in the circumferential direction of the lower half; and
two lower half side segments arranged on both sides in the circumferential direction of the lower half center segment, and each having one circumferential end portion facing a circumferential end portion of the lower half center segment;
the packing ring upper half part is stationarily supported by the upper half stationary part;
the packing ring upper half part has:
an upper half center segment arranged at a center portion in the circumferential direction of the upper half; and
two upper half side segments arranged on both sides in the circumferential direction of the upper half center segment, and each having one circumferential end portion facing a circumferential end portion of the upper half center segment, and the other end portion supported by a support plate provided to the horizontal joint surface of the upper half stationary part; and
the turbine shaft sealing device further comprises:
a lower half center biasing part to perform biasing the lower half center segment toward a radially inner side;
a lower half side biasing part to perform biasing each of the two lower half side segments toward the radially inner side;
an upper half side biasing part to perform biasing each of the two upper half side segments toward the radially inner side; and
two upper half center biasing part that are provided between the upper half center segment and the respective two upper half side segments, and that is configured to perform biasing toward the upper half center segment in a direction of making the upper half center segment and the respective two upper half side segments adhere to each other,
the turbine shaft sealing device further including a target segment support structure that is provided between each of the two lower half side segments set as a target lower half segment and the lower half stationary part to support the lower half side segment, and that has a height adjustment part capable of adjusting a relative position in an upper and lower direction between the lower half stationary part and the lower half side segment, wherein:
the lower half stationary part has a stationary part cutout formed on a first upper end surface thereof;
the target lower half segment has a female screw formed on a second upper end surface thereof;
the target segment support structure has a support plate housed in the stationary part cutout and horizontally fixed to the lower half stationary part;
the height adjustment part has an adjustment screw capable of supporting a weight of the target lower half segment by screwing together with the female screw formed on the target lower half segment;
the target lower half segment has a receiving hole formed in a horizontal direction from a side surface, for housing the support plate;
the support plate is housed in the receiving hole; and
a tip of the female screw can press an upper surface of the support plate.
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