Probe for controlling the surface of a circumferential recess of a turbojet engine disc using foucault currents

A turbojet and engine technology, applied in the field of probes, can solve problems such as measurement error and reduced accuracy of results, and achieve the effects of reducing impact, reducing the number of inspections, and limiting the risk of errors

Active Publication Date: 2011-04-20
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large number of measurements and calculations and the difficulty of positioning the sensor against the detection surface make the results less accurate
Also, since known systems only allow inspection of one side of the slit, the problems associated with rod bending become apparent over time, resulting in erroneous measurements due to misorientation of the multi-element sensor relative to the inspection surface

Method used

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  • Probe for controlling the surface of a circumferential recess of a turbojet engine disc using foucault currents
  • Probe for controlling the surface of a circumferential recess of a turbojet engine disc using foucault currents
  • Probe for controlling the surface of a circumferential recess of a turbojet engine disc using foucault currents

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Embodiment Construction

[0025] figure 1 A portion of a turbojet disk 1 is shown having a circumferential slot 2 machined therein for receiving a series of blades. The slot has a substantially cylindrical central face 4 around the axis A-A, and two sides 3 of concave annular shape. The slot 2 opens outwards through an annular opening 5 having a width L measured in the axial direction 1 . Width L of opening 5 1 less than the maximum width L of the slot 2 measured in the axial direction (i.e. between its sides 3) 2 .

[0026] The probe of the present invention refers to figure 1 describe. The probe 6 includes: a rod 7 , a support 8 and two multi-element sensors 9 . arrow f 1 , f 2 , f 3 Denotes the degrees of freedom of the rod 7 which are determined by ball slides and springs, not shown. These degrees of freedom are defined below with reference to the marked frame of the turbojet disk. In particular, the arrow f 1 Corresponding to the rod moving along the axis of the disk, the arrow f 2 c...

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Abstract

The invention relates to a probe (6) for controlling the surface of a circumferential recess (2) formed in a disc (1) of a turbojet engine using Foucault currents. The probe includes a rod (7) attached to a bearing (8), a first multiple-element sensor (9) following the movements of the rod (7) and which is to be inserted into said circumferential recess (2) for carrying out the control, and a second multiple-element sensor (9). The two multiple-element sensors (9) are arranged back-to-back and the rod (7) of the probe (6) is mounted so as to pivot about the axis thereof for inserting the two multiple-element sensors (9) into said recess (2).

Description

technical field [0001] The invention relates to a probe for inspecting surface anomalies and irregularities of circumferential slots in turbojet disks using eddy currents. Background technique [0002] The circumferential slots of the turbojet disk are used to accommodate a series of blades, which are subjected to high levels of stress when the turbojet engine is in operation, especially on its concavely angled faces (hereinafter referred to as the "sides" of the slot ). As a result, seams of this type require very frequent inspections. If the accessibility of the side is not good, its surface condition is usually confirmed in practice by performing an inspection using eddy currents. This type of inspection involves scanning the inspection surface with a probe equipped with a sensor that generates an eddy current in the portion under inspection by creating an electromagnetic field. In practice, this part is often pivoted while the probe remains stationary on its support. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/904G01N27/9033G01N27/9006
Inventor 帕特里克·卡巴尼斯桑德拉·夏安奈特帕特里克·盖斯诺卢克·里维兹
Owner SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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