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BORESCOPE PLUG WITH HONEYCOMB SHANK

IP.com Disclosure Number: IPCOM000228884D
Publication Date: 2013-Jul-10
Document File: 3 page(s) / 269K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention concerns gas turbines and provision of inspecting the rotating parts thereof. The invention is a plug, the shank portion of which is made of honeycomb material that can sacrificially take impact load without damaging the impacting member or other parts of the turbine. In the event that the plug shank protrudes out into the flow path, the rotating vanes hit the plug shank, which readily takes the impact load by getting damaged and saves the vanes from damage. This plug can also be used as instrumentation probe holder as the honeycomb shank gives good structural damping to probe vibrations and enables good gripping of the probe. Advantages of the invention include improved safety by preventing damage to turbine vanes, with reduced inventory.

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BORESCOPE PLUG WITH HONEYCOMB SHANK

BACKGROUND

The invention concerns gas turbines and provision of inspecting the rotating parts thereof. Borescope plugs are used to close the holes in the casings meant for borescope inspection of rotating parts such as turbine blades. These plugs close the complete depth of the hole till the flow path to avoid aero-acoustic disturbances. Borescope holes at different stages are of different lengths and so are the plugs. Sometimes it is possible that these plugs get assembled wrongly at different stages which may cause shank of the plug to protrude out into the flow path. In such a case, during operation of the machine the protruding shank portion could hit the rotating vanes. In that case, the vanes could get damaged or broken and there is a possibility that any broken debris may cause huge impact damage to the engine. Plugs with bristles that do not cause damage to the vanes have been proposed (US20100275574). The invention proposes an improved plug with honeycomb shank that will take impact load sacrificially and save the rotating vanes from getting damaged.

DRAWINGS

Borescope plug with honeycomb shank is described further with reference to the following drawings in which:

Figure 1A and 1B illustrate honeycomb shanks for borescope plug (1A) and instrumentation probe holder (1B).

DETAILED DESCRIPTION

The invention is a plug, the shank portion of which is made of honeycomb material that can sacrificially take impact load without damaging the impacting member or other parts of the turbine, as shown in Fig. 1A. In the event that the plug shank protrudes out into the flow path, the rotating vanes hit the plug shank, which r...