Wheel disc of circumferential rod fastening rotor, circumferential rod fastening rotor and gas turbine

Abstract

The invention provides a wheel disc of circumferential rod fastening rotor, the circumferential rod fastening rotor and a gas turbine. A plurality of tie rod holes, through which the tie rods can penetrate, are formed in the wheel disc, and are uniformly distributed in a circumferential direction around the central axis of the wheel disc; each tie rod hole comprises a basic circular hole and an arc groove expanding outwards from the basic circular hole; the diameter of each basic circular hole is larger than the maximum outer diameter of the tie rods; each arc groove has two sections which are symmetrically distributed; the circle centers of the two sections of each arc groove are on the perpendicular connection line of the circle center of the corresponding basic circular hole and the central axis of the wheel disc; and the inner diameters of the two sections of each arc groove are equal to the maximum outer diameter of the tie rods. Therefore, stress concentration in contact areas of the tie rod holes is reduced, so that the integral service life of the wheel disc and the tie rods is prolonged, and safe operation of a machine set is facilitated.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a disc used for a circumferential tie rod rotor, a circumferential tie rod rotor and a gas turbine. Background technique [0002] At present, there are various structural forms of heavy-duty gas turbine rotors, which can be roughly divided into three types: drum rotor, disc rotor and disc-drum rotor. [0003] The drum rotor is composed of a drum and a half shaft. The rotor has a simple structure, a small amount of machining, and good rigidity. It is generally a rigid shaft. However, because it relies on the drum to bear the centrifugal force load, the strength is poor, and the peripheral speed at the outer diameter of the drum cannot be too high, so the drum rotor is rarely used in heavy-duty gas turbines at present. [0004] The discs of all levels of the disc rotor are sleeved on the shaft with a certain amount of interference, and the torque is transmitted by the pretigh...

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Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a wheel disk for a circumferential tie-rod rotor, a circumferential tie-rod rotor and a gas turbine, which are used to solve the stress concentration between the tie rods and the tie rod holes in the prior art, The problem of easy damage of tie rods and discs

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