Turbine blade testing device and testing method thereof

Patent metadata

Field	Value
Publication number	US-9804128-B2
Application number	US-201414556346-A
Country	US
Kind code	B2
Filing date	Dec 1, 2014
Priority date	Dec 3, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

According to one embodiment, a testing device of a turbine blade includes: a non-compressive elastic medium brought into close contact with a platform of the turbine blade in a state fastened to a turbine rotor; a probe which has piezoelectric elements arranged in an array and transmits ultrasound waves toward a fastening portion of the turbine blade through the elastic medium and receives echo waves; and a display portion for imaging an internal region of the fastening portion on the basis of the echo waves and displaying the same.

First claim

What is claimed is:

1. A testing device of a turbine blade comprising:
an elastic medium configured to contact with a platform of the turbine blade in a state fastened to a turbine rotor;
a probe, comprising piezoelectric elements arranged in an array, configured to transmit ultrasound waves toward a fastening portion of the turbine blade through the elastic medium contacting with the platform and to receive echo waves of the ultrasound waves; an accommodating chamber configured to accommodate the probe and the elastic medium and further configured to hold the probe contacting with the elastic medium that is in contact with the platform; and
a display configured to image an internal region of the fastening portion on the basis of the echo waves, wherein the accommodating chamber comprises:
an opening from which the elastic medium is configured to contact with the platform;
a first support, extending in a radial direction of the turbine rotor, configured to abut with the turbine blade;
a second support, extending in a rotation axis direction of the turbine rotor, configured to abut with the turbine blade; and
a position adjuster configured to adjust a position of the probe in the accommodating chamber.

2. The testing device of a turbine blade according to claim 1 , wherein
the elastic medium has a reversed shape of the platform to be brought into close contact.

3. The testing device of a turbine blade according to claim 1 ,
wherein
the elastic medium is mixed with magnetic body particles.

4. The testing device of a turbine blade according to claim 1 , wherein:
a thickness or a propagation damping rate of the elastic medium is set in order to prevent multiple reflected waves generated between the probe and the platform from being superposed on echo waves from a region including the fastening portion.

5. A testing method of a turbine blade, comprising
preparing a probe, an elastic medium, and an accommodating chamber, the accommodating chamber comprising:
an opening;
a first support extending in a radial direction of the turbine rotor;
a second support extending in a rotation axis direction of the turbine rotor,

accommodating the probe and the elastic medium in the accommodating chamber so that the elastic medium is placed adjacent to the opening;
abutting the first and the second support with the turbine rotor so that the elastic medium contacts with a platform of the turbine blade in a state fastened to a turbine rotor through the opening;
transmitting ultrasound waves from a probe toward a fastening portion of the turbine blade through the elastic medium;
receiving echo waves of the transmitted ultrasound waves by the probe; and
imaging an internal region of the fastening portion on the basis of the echo waves.

6. The testing method of a turbine blade according to claim 5 , further comprising:
adjusting a position of the probe in the accommodating chamber.

Assignees

• Toshiba Kk

Inventors

• Yamamoto Setsu
• Miura Takahiro
• Semboshi Jun
• Ochiai Makoto
• Murakami Masato
• Nomura Hiroshi
• Fuchi Takuya

Classifications

• G01N29/0645 Primary

  Display representation or displayed parameters, e.g. A-, B- or C-Scan · CPC title

• G01N29/04 Primary

  Analysing solids (using acoustic emission techniques G01N29/14) · CPC title

• G01N29/225

  Supports, positioning or alignment in moving situation · CPC title

• G01N2291/044

  Internal reflections (echoes), e.g. on walls or defects · CPC title

• G01N29/28

  providing acoustic coupling {, e.g. water (impedance matching G10K11/02)} · CPC title