Single-axis inspection scope with spherical camera and method for internal inspection of power generation machinery

Patent metadata

Field	Value
Publication number	US-9948835-B2
Application number	US-201615212370-A
Country	US
Kind code	B2
Filing date	Jul 18, 2016
Priority date	Jan 31, 2012
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Internal components of power generation machinery, such as gas turbine engines, are inspected with a spherical optical camera inspection system mounted on a compact diameter, single-axis inspection scope that is capable of insertion within an inspection port or other accessible insertion site. The inspection scope includes nested, non-rotatable telescoping tubes, which define an extension axis. Circumscribing, telescoping tubes have anti-rotation collars, which are in sliding engagement with a mating axial groove on an outer circumferential surface of a circumscribed tube. The camera is advanced and/or retracted along a scope extension axis by nested, drive tubes, which incorporate at least one external drive screw on a circumscribed drive tube and corresponding female threads formed in a circumscribing drive tube. The spherical camera has a 360-degree field of view, and captures images without rotation about the scope extension axis.

First claim

What is claimed is:

1. A system for internal inspection of a power generation machine, comprising:
a single-axis, extendable inspection scope, for insertion into an inspection port of a power generation machine, having:
first, and second nested, telescoping tubes, respectively having proximal and distal ends and axial length,
the second telescoping tube having an axial groove on an outer circumferential surface thereof,
the first telescoping tube having a first anti-rotation collar coupled proximal the distal end thereof, in sliding engagement with the axial groove of the second telescoping tube;

first and second nested drive tubes retained within the telescoping tubes, respectively having proximal and distal ends and axial length,
the first drive tube having a first drive bushing coupled to the distal end thereof, both of which are rotatable within the telescoping tubes, the first drive bushing defining a bore with female drive threads,
the second drive tube defining external male drive threads in engagement with the first drive bushing female threads;

a camera-mounting collar rigidly coupled to the respective distal ends of the second telescoping tube and the second drive tube, preventing relative rotation thereof;
a rotatable drive hub coupled to the proximal end of the first drive tube, for selective rotation thereof;
a mounting flange coupled to the first telescoping tube, for affixation to a power generation machine inspection port; and

a spherical camera, having a 360 degree field of view, coupled to the camera mounting collar, for insertion into a power generation machine and capture of inspection images therein.

2. The system of claim 1 , further comprising:
a distal portion of the rotatable drive hub oriented within the proximal end of the first telescoping tube, and engaged within the first drive tube;
a proximal portion of the drive hub coupled to a driven gear that is external the first telescoping tube;
a first drive gear engaged with the driven gear, for rotating the driven gear and the drive hub; and
a drive apparatus coupled to the first drive gear.

3. The system of claim 2 , the drive apparatus comprising a hand crank.

4. The system of claim 2 , the drive apparatus comprising an electric motor.

5. The system of claim 2 , further comprising:
the first drive gear directly engaged with the driven gear, driven by a hand crank drive apparatus; and
a second drive gear directly engaged with the driven gear, driven by an electric motor;

the respective drive gears independently and selectively capable of driving the driven gear.

6. The system of claim 1 , the first anti-rotation collar retaining a ball bearing that is in engagement within the axial groove of the second telescoping tube.

7. The system of claim 1 , further comprising at least one additional telescoping tube interposed and nested between the first and second telescoping tubes, each additional telescoping tube defining an axial groove on an outer circumferential surface thereof, for engagement with an anti-rotation collar of a circumscribing telescoping tube, and an anti-rotation collar coupled proximal a distal end thereof, in sliding engagement with the axial groove of an inscribed telescoping tube retained therein.

8. The system of claim 1 , further comprising at least one additional drive tube interposed and nested between the first and second drive tubes, each additional drive tube defining male drive threads on an outer circumferential surface thereof, for engagement with female threads of a drive bushing of a circumscribing drive tube, and a drive bushing coupled proximal a distal end thereof, in engagement with drive threads of an inscribed drive tube retained therein.

9. The system of claim 1 , further comprising a camera housing coupled to the camera collar, enveloping the camera.

10. The system of claim 9 , the camera housing further comprising an illumination system, coupled thereto, for illuminating the camera field of view.

11. The system of claim 1 , further comprising:
a position encoder, for correlating hub rotation with axial displacement of the camera field of view; and
an image processing system coupled to the camera and the position encoder, for storing plural images taken at different camera axial displacement positions, and for combining plural inspection images into a composite image.

12. A system for internal inspection of a power generation machine, comprising:
a single-axis, extendable inspection scope, which defines an extension axis, for insertion into an inspection port of a power generation machine, the scope having:
first, second, third, and fourth nested, telescoping tubes, respectively having proximal and distal ends and axial length,
the second, third and fourth telescoping tubes respectively having an axial groove on an outer circumferential surface thereof,
the first telescoping tube having a first anti-rotation collar coupled proximal the distal end thereof, in sliding engagement with the axial groove of the second telescoping tube,
the second telescoping tube having a second anti-rotation collar coupled proximal the distal end thereof, in sliding engagement with the axial groove of the third telescoping tube,
the third telescoping tube having a third anti-rotation collar coupled proximal the distal end thereof, in sliding engagement with the axial groove of the fourth telescoping tube;

first, second and third nested drive tubes retained within the telescoping tubes, respectively having proximal and distal ends and axial length,
the first drive tube having a first drive bushing coupled to the distal end thereof, both of which are rotatable within the fourth telescoping tube, the first drive bushing defining a bore with female drive threads,
the second drive tube defining external male threads in engagement with the first drive bushing female threads, and having a second drive bushing coupled to the distal end thereof, both of which are rotatable within the fourth telescoping tube, the second drive bushing defining a bore with female drive threads,
the third drive tube defining external male threads in engagement with the second drive bushing female threads;

a camera-mounting collar rigidly coupled to the respective distal ends of the fourth telescoping tube and the third drive tube, preventing relative rotation thereof;
a rotatable drive hub coupled to the proximal end of the first drive tube, for selective rotation thereof;
a mounting flange coupled to the first telescoping tube, for affixation to a power generation machine inspection port; and

a spherical camera, having a 360 degree field of view, coupled to the camera mounting collar, for insertion into a power generation machine and capture of inspection images therein.

13. The system of claim 12 , at least one of the anti-rotation collars retaining a ball bearing that is in engagement within the axial groove of the second telescoping tube.

14. The system of claim 12 , further comprising:
a distal portion of the rotatable drive hub oriented within the proximal end of the first telescoping tube, and engaged within the first drive tube;
a proximal portion of the drive hub coupled to a driven gear that is external the first telescoping tube;
a first drive gear engaged with the driven gear, for rotating the driven gear and the drive hub; and
a drive apparatus coupled to the first drive gear.

15. The system of claim 14 , further comprising:
a controller box retaining the driven gear and the first drive gear, the first drive gear directly engaged with the driven gear, driven by a hand crank drive

Assignees

• Siemens Energy Inc

Inventors

• Deascanis Joshua
• Letter David
• Piersall Isaac
• Hatcher Jr Clifford

Classifications

• H04N23/698

  for achieving an enlarged field of view, e.g. panoramic image capture · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N23/555

  for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes · CPC title

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title

• F05D2270/80

  Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges · CPC title