Question

What is the purpose of the damping blade and magnet arrangement? How does it work? (For the current balance - a device used to measure the force between 2, straight, parallel current.)

Answer 1

In turbomachinery, the rotating blades are for one right field of operating conditions designed resonance-free. Due to varying operating conditions, e.g. B. Volume flow rates of the flowing equipment or back pressure operation in the border area, the blades become stochastic to Schwin stimulated. In the case of vibration resonance, these lead mechanical stresses for blade failure. Various devices are available to dampen these vibrations have been developed that copy the blades together peln and thus dampen vibrations. Known concepts are, for example, damper wires, damper bolts, blades cover plates and forged cams with pins. About that In addition, for example, EP 0 214 393 includes blades knows the magnetic inserts for damping vibrations tra These magnetic inserts collide against one another by an oversize over the distance between two blades and / or by pre-torsion the blades in the blade assembly on the rotor are non-positive on each other. The aim of this known device is the Ver stiffness of the blade assembly against vibrations different order of excitement. As soon as the during drive occurring vibration forces the specified Ma exceeding the magnetic force, the magnetic force dissolves high-volume connection pretty suddenly. This Un Break in the stiffening reduces vibrations expressive, which gradually calms down the sy stems leads.

The execution and processing of these known blades with abutting magnetic inserts to dampen Schwin conditions as well as the bucket assembly is in terms of gefor dimensional accuracy is time-consuming and costly. In addition must have appropriate spreading tools for mounting on egg a paddle wheel. In addition, the abutting magnetic inserts on their contact surfaces chen frictionally connected, what a typical magnet material with comparatively low hardness to the corresponding Can lead to abrasion. The magnet inserts therefore need one periodic maintenance. Furthermore, the interpretation of the Buckets with regard to the vibration load that occurs if only because the blades of one on the one hand as an oscillating blade system within the form coherent paddle wheel are to be designed and on the other hand each bucket - in the event of lifting off from the neighboring th blades - designed as a single unit that can oscillate must become.