System and method for implementing intrinsic safety in rotating machine

Abstract

The embodiments herein disclose a system and method for providing an intrinsic safety to rotating machinery from the failure of internal high speed rotating structures. According to one embodiment herein, a system assembly comprises a unique design of the rotating structure to provide a sufficient safety margin and redundancy in configuration. The system assembly comprises a blower fan assembled inside a blower casing and rotated inside the casing. The fan is manufactured by a single forging process instead of an investment casting. The fan comprises several blades mounted to a hub in a shroud to draw a required quantity of fluid. The fan is mounted to a shaft through the hub. When the blower fan is rotated at a high speed exceeding the design parameters, a ‘rub and stop’ mechanism is initiated to halt the fan.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims the priority of the Indian Provisional Patent Application No. 3755 / CHE / 2013 filed on Aug. 26, 2013, and postdated to Nov. 26, 2013 with the title “A System and Method of Implementing Intrinsic Safety in Rotating Structures”, and the content of which is incorporated in entirety by reference herein.BACKGROUND[0002]1. Technical Field[0003]The embodiments herein generally relate to rotating machinery and particularly relates to a method for protecting the rotating structures from failures at high speed rotations. The embodiments herein more particularly relates to a system and method for providing an intrinsic safety to the rotating structures of the turbo machines against failure, more specifically disk burst.[0004]2. Description of the Related Art[0005]Rotating structures are subject to the centrifugal forces which cause stresses. These stresses tend to exist in the radial and tangential directions of the rota...

AI Technical Summary

Benefits of technology

The patent describes a system and method for making rotating machinery safer in case of failure. The system includes a unique design for the rotating structure, such as a blower fan, that provides a sufficient safety margin and redundancy in configuration. The fan is assembled inside a blower casing and is made from a single forging instead of an investment casting. The fan comprises a plurality of blades, a hub, and a shroud. The design also includes a rub and stop mechanism that halts the rotation of the fan if it exceeds design parameters. The rub and stop mechanism is based on frictional contact between a high speed rotating part and an enclosure of the rotating part. The method can be applied to any rotating machinery to prevent any chance of disk burst.

Problems solved by technology

In case the speed of the rotating component exceeds a certain critical value termed as the burst speed, the rotating structure fails catastrophically due to the stresses.

This leads to heavy and bulky structures for containment of the fragments.

This results in the rotor being thick and bulky.

In case of a disk burst or blade failure, the fragments cause a cascading failure of a multistage rotor.

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