FIELD: machine building.
SUBSTANCE: rotary machine, and namely a turbine, a pump or a compressor. Rotor (6) includes levelling piston (10) for action on axial shift of the rotor. Levelling piston (10) has changes (21, 22, 23, 24) of rotor (6) diameter. The first (31), the second (32) and the third (33) shaft seals on levelling piston (10) are installed between them, which seal the first (11), the second (12), the third (13) and the fourth (14) discharge chambers respectively with their pressure in each chamber. The first change (21) of the diameter is subject to pressure of the first discharge chamber (11), the second change (22) is subject to pressure of the second chamber (12), the third change (23) is subject to pressure of the third chamber (13), and the fourth change (24) of the diameter is subject to pressure of the fourth chamber (14). The first (11) and the third discharge chambers (13) are connected by means of the first discharge channel (71) to the first pressure level in the section of the coming-down flow of the rotary machine. Pressure in the first (11) and the third (13) discharge chambers is the same. The second (12) and the fourth (14) discharge chambers are connected by means of the second discharge channel (72) to the second pressure level at blade grid (4) of rotary machine (1) so that pressures in the second (12) and the fourth (14) discharge chambers are the same.
EFFECT: reduction of installation space owing to reducing the levelling piston diameter without any reduction of displacement compensation potential.
6 cl, 5 dwg
