Shroud ring external fluid infusion hydraulic pressure expanding and reinforcing process for turbine generator

Abstract

The invention relates to a process for strengthening the bulging of external fluid replenishing hydraulic of a protective ring of a turbine generator, which is applied to the turbine generator field. High-pressure liquid produced by an external high-pressure pump passes through a passage of a high-pressure cylinder and is injected into a closed space formed by a upper fixed cone mould, a lower movable cone mould and the protective ring by a passage in a force-reduction column of a mould part in order that the protective ring generates plastic deformation under the action of hydraulic pressure, thereby achieving the aim of strengthening the protective ring; through adjusting low pressure of liquid in a low-pressure cylinder, the stress size of a contact part between the protective ring and the mould is adjusted so as to achieve the aim of sealing and adjusting the shape and the size of the protective ring; and a displacement sensor is used to monitor the bulging size of the protective ring. The process no longer occupies large-scale hydraulic press equipment, uses a load-bearing frame with a simple structure and small dimension and an external liquid replenishing cylinder to replace a hydraulic press for strengthening the protective ring; the bulging process can substantially reduce force, is easy to control the forming process, can repeatedly bulge, greatly improve the forming precision of the protective ring and reduce the machining allowance by 1 / 3 than the routine common hydraulic bulging; and the mould has a simple structure, convenient mounting and detachment, strong universality and low production cost and can achieve higher economical benefit.

Description

Technical field: [0001] The invention relates to a hydraulic bulging strengthening process for replenishing liquid outside a retaining ring of a turbogenerator in the field of a turbogenerator. Background technique: [0002] At present, the retaining ring is a key part of the turbogenerator unit, and it is baked and embedded at both ends of the rotor to fix the ends of the winding coils. As the rotor rotates at a high speed (3000 r / min), it bears a large centrifugal stress and superimposed load on the guard ring from the coil winding at the slot end. Therefore, the guard ring needs to have a high material yield strength. When the ring is working in a strong magnetic field, the electromagnetic induction will cause the guard ring to heat up, which will affect the efficiency of the generator. The guard ring must be made of austenitic non-magnetic steel material. Since the material of the retaining ring is non-phase transformation austenitic steel, its strength cannot be improv...

AI Technical Summary

Problems solved by technology

The manufacturing of retaining rings in the past has the following disadvantages: 1. Occupying large hydraulic press equipment, the structure is complex and expensive

2. The forming process is not easy to control, and the bulging cannot be repeated. The forming accuracy of the retaining ring is not high, and the conventional ordinary hydraulic bulging has a large machining allowance

3. The mold structure is complex and inconvenient to load and unload

4. The mold has poor versatility, and a set of molds can only produce one type of retaining ring

5. The production cost is high, it is not easy to organize specialized production, and the economic benefit is not high

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