ULTRASONIC TESTING APPARATUS FOR TURBINE FORKS AND METHOD THEREOF

• US 20090120192A1
• Filed: 09/27/2007
• Published: 05/14/2009
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Hitachi Engineering & Services Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: SUZUKI, Yutaka, Suzuki, Kazuhiro, Adachi, Yuuji, Isaka, Katsumi, Kodaira, Kojirou, Kumasaka, Kenji, Matsui, Tetsuya, Odakura, Mitsuru, Tayama, Kenji, Koike, Masahiro
• Granted Patent: US 7,841,237 B2
• Time in Patent Office: Days
• US Class Current: 73/623
• CPC Class Codes: G01N 2291/0289 Internal structure, e.g. defects, grain size, texture
• CPC Class Codes: G01N 2291/2693 Rotor or turbine parts
• CPC Class Codes: G01N 29/07 by measuring propagation velocity or propagation time of acoustic waves
• CPC Class Codes: G01N 29/225 Supports, positioning or alignment in moving situation
• CPC Class Codes: G01N 29/265 by moving the sensor relative to a stationary material

Abstract

An ultrasonic testing apparatus for a turbine fork of a turbine blade joined to a turbine disc, comprising:

• • an ultrasonic testing sensor;
  • a sensor mounting apparatus for mounting the ultrasonic testing sensor on a flat portion on a side surface of the turbine fork with the turbine blade joined to the turbine disc; and
  • an ultrasonic testing apparatus for inspecting internal and external surfaces of the turbine fork by using reflected waves, which is received by the ultrasonic testing sensor, from the internal surface of the turbine fork.

Claims

1. An ultrasonic testing apparatus for a turbine fork of a turbine blade joined to a turbine disc, comprising:

an ultrasonic testing sensor;

a sensor mounting apparatus for mounting said ultrasonic testing sensor on a flat portion on a side surface of said turbine fork with said turbine blade joined to said turbine disc; and

an ultrasonic testing apparatus for inspecting internal and external surfaces of said turbine fork by using reflected waves, which is received by said ultrasonic testing sensor, from the internal surface of said turbine fork.

2. The ultrasonic testing apparatus for a turbine fork according to claim 1, wherein said sensor mounting apparatus has a rotating apparatus for rotating said ultrasonic testing sensor and a driving apparatus for moving said ultrasonic testing sensor in parallel.

3. The ultrasonic testing apparatus for a turbine fork according to claim 1, wherein said ultrasonic testing apparatus uses a predetermined ultrasonic wave generated in said turbine fork as a reference signal, and detects a reflected wave from a defect by comparing a detected ultrasonic wave with the reference signal.

4. The ultrasonic testing apparatus for a turbine fork according to claim 2, wherein said ultrasonic testing apparatus uses a predetermined ultrasonic wave generated in said turbine fork as a reference signal, and detects a reflected wave from a defect by comparing a detected ultrasonic wave with the reference signal.

5. An ultrasonic testing method for a turbine fork of a turbine blade joined to a turbine disc, comprising the steps of:

mounting an ultrasonic testing sensor on a flat portion on a side surface of said turbine fork with said turbine blade joined to said turbine disc; and

inspecting internal and external surfaces of said turbine fork by using reflected waves, which is received by said ultrasonic testing sensor, from the internal surface of said turbine fork.