System for monitoring sealing wear

• US 7,551,268 B2
• Filed: 06/27/2007
• Issued: 06/23/2009
• Est. Priority Date: 10/28/1997
• Status: Expired due to Fees

• Current Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Original Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Inventors: Discenzo, Frederick M.
• Primary Examiner(s): Lee; Hwa (Andrew) S
• Application Number:
  US11/769,312
• Publication Number:
  US 20080181553A1
• Time in Patent Office: 727 Days
• Field of Search: 356/32, 356/35.5, 356/477, 356/478
• US Class Current: 356/32
• CPC Class Codes: B60C 11/24 Wear-indicating arrangements
• CPC Class Codes: F16D 2066/001 Temperature
• CPC Class Codes: F16D 66/02 Apparatus for indicating wear
• CPC Class Codes: G01B 11/06 for measuring thickness ; e.g. of sheet material thickness measurement by thermal means G01B21/085
• CPC Class Codes: G01D 5/268 using optical fibres G01D5/28 - G01D5/38 take precedence
• CPC Class Codes: G01D 5/35312 using a Fabry Perot
• CPC Class Codes: G01M 11/086 Details about the embedment of the optical fiber within the DUT
• CPC Class Codes: H01R 39/58 Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby
• CPC Class Codes: H02K 11/35 Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
• CPC Class Codes: H02K 5/14 Means for supporting or protecting brushes or brush holders

Abstract

A system for determining at least one condition of a seal including an optical fiber for transmitting light from a light source. The optical fiber is embedded in the seal and operatively coupled to an interferometric system. The interferometric system is operatively coupled to a processor. The interferometric system provides the processor with information relating to wear of the optical fiber, and the processor determines wear of the seal, rate of wear and remaining useful life of the seal based on the information relating to wear of the optical fiber.

Claims

1. A sensor device comprising:

a seal associated with a motor;

a first optical fiber embedded within the seal associated with the motor, the first optical fiber includes at least one microbend; and

a pressure sensor that incessantly monitors pressure on the seal based in part on a change in amplitude of the at least one microbend.

2. The device of claim 1, further comprising a second optical fiber embedded within the seal, the second optical fiber facilitates continuous measurement of wear of the seal.

3. The device of claim 2, the second optical fiber facilitates continuous measurement of at least one of a radial wear between an inner surface and an outer surface of the seal and an axial wear that occurs within the seal in a direction substantially co-axial to a shaft.

4. The device of claim 3, further comprising a third optical fiber that facilitates sensing a fluctuation in temperature associated with the seal based in part on a coating applied on the third optical fiber.

5. The device of claim 4, the coating comprising a temperature-sensitive index of refraction material.

6. The device of claim 4, the third optical fiber is coupled to a temperature sensor.

7. The device of claim 6, the temperature sensor directs a measuring beam through the third optical fiber.

8. The device of claim 7, the measuring beam strikes an object associated with the seal.

9. The device of claim 8, the measuring beam is reflected from the object through the third optical fiber to the temperature sensor.

10. The device of claim 9, further comprising, an analysis component that receives an electrical signal generated by the temperature sensor based on data from the reflected measuring beam and determines a temperature relating to the seal based on the received electric signal.

11. The device of claim 1, further comprising an interferometric system that is operatively connected to the first optical fiber, the interferometric system collects data related to the seal based in part on information received from the first optical fiber.

12. The device of claim 11, the interferometric system facilitates determination of a reduction in length of the first optical fiber, an amount of wear of the seal can be determined based in part on the reduction in length.

13. A method for sensing a characteristic related to a motor, comprising:

measuring pressure of a mechanical seal based in part on a change in amplitude of at least one microbend permanently induced in a first optical fiber, the

first optical fiber embedded within the mechanical seal; and

monitoring at least one of radial and axial wear of the seal by employing at least a second optical fiber.

14. The method of claim 13, initially comprising embedding the at least first or second optical fibers into a lip of the seal.

15. The method of claim 14, further comprising sensing temperature of the seal with at least a third optical fiber.

16. The method of claim 15, further initially comprising embedding the at least first, second or third optical fibers into a location within the seal that surrounds a shaft, the at least first, second or third fibers disposed at least one of radial to the shaft, co-axial with the shaft, at an inner surface of the seal and at an outer surface of the seal.

17. A sensor device, comprising:

means for incessantly measuring pressure on a seal associated with a motor based in part on a change in amplitude of at least one microbend induced on a first optical fiber embedded within the seal; and

means for continuously measuring wear on the seal based on information received from a second optical fiber embedded within the seal.