초록 ▼

A vane system for a centrifugal compressor (10), comprising two rows (15, 20) of vanes (15', 20') installed in series inside a suction duct (14), the first row (15) of fixed vanes (15') being suitable for homogenizing the gas flow that passes through them and sending it to the second row (20) of adj

A vane system for a centrifugal compressor (10), comprising two rows (15, 20) of vanes (15', 20') installed in series inside a suction duct (14), the first row (15) of fixed vanes (15') being suitable for homogenizing the gas flow that passes through them and sending it to the second row (20) of adjustable vanes (20') equipped with a guiding mechanism comprising a mechanical system (30) suitable for varying the orientation of the vanes (20').

대표청구항 ▼

The invention claimed is: 1. A vane system for a centrifugal compressor (10), comprising two rows of vanes installed in series inside a suction duct, a first row of fixed vanes being suitable for homogenizing a gas flow passing through them and sending it to a second row of adjustable vanes, said s

The invention claimed is: 1. A vane system for a centrifugal compressor (10), comprising two rows of vanes installed in series inside a suction duct, a first row of fixed vanes being suitable for homogenizing a gas flow passing through them and sending it to a second row of adjustable vanes, said second row being equipped with a guiding mechanism comprising a mechanical system suitable for varying an orientation of the vanes, the mechanical system including a connection of each adjustable vane of the second row to a shaft by a first leverage suitable for receiving a rotation imparted by an actuator, each adjustable vane being connected, through a respective foot produced in the form of a shaft, to the first leverage, in turn connected by a first rotating ring pin, to a disk which receives rotational movement induced by the shaft, and the first leverage comprises a lever fixed at one end to said foot of the adjustable vane and hinged at the other end to a tie rod by a second rotating ring pin. 2. The vane system according to claim 1, wherein said first row of fixed vanes is fixed by roots to a structure of the diffuser, in turn connected to a terminal portion a compressor box. 3. The vane system according to claim 1, wherein the second row of adjustable vanes equipped with the mechanical system, is activated by a pneumatic actuator, suitable for varying the orientation of the vanes so as to vary an incidence angle on a rotor, thus modifying a flow gradient and discharge pressure. 4. The vane system according to claim 1, wherein said tie rod is, in turn, hinged to the disk to receive the rotational movement of the shaft. 5. The vane system according to claim 4, wherein said shaft is connected to said disk by a second leverage. 6. The vane system according to claim 1, wherein said shaft is equipped with a thrust rim which rests on bushings coated with antifriction treatment. 7. The vane system according to claim 5, wherein said shaft is divided into two portions, a first portion towards the vanes, and a second portion outwards, connected by a joint. 8. The vane system according to claim 7, wherein a ring is positioned at the end of the first portion of said shaft, close to the joint, equipped with Teflon washers, energized with a spring to retain a process gas inside a compressor box, and a further ring, equipped with o-ring washers, is situated downstream, to retain the lubricant vapors. 9. The vane system according to claim 1, wherein the shaft is also equipped with at least one sealing ring which serves to keep dirty particles and sludge out of a compressor box. 10. The vane system according to claim 1, wherein there is also a spiral coil which envelops the shaft to keep it in a stand-by position, and which rests on a retention body which rubs against the shaft itself, with an interposition of antifriction bushings. 11. The vane system according to claim 7, wherein the end of the second portion of the shaft which protrudes outside a compressor box is connected to an actuation and control system comprising the actuator which transmits rotation upon command, a third leverage substantially similar to the first and the second leverages and a reading system of the inclination angle of the vanes. 12. The vane system according to claim 11, wherein the reading of the inclination angle of the vanes of the second row is effected by a reference index fixed to the third leverage and which cooperates with a graduated label fixed to the ring.