US5345829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for predicting abnormality of mechanical seal and apparatus for predicting same
Assignee: Tanken Seiko KK
•
Filing: 1993-09-20
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Granted: 1994-09-13
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Expires: 2013-09-20
Abstract
Abstract A method for predicting abnormality of a mechanical seal comprises detecting a displacement in the radial direction of a slidable ring of a mechanical seal and predicting abnormality of the mechanical seal from the displacement detected which represents the extent of adhesion of the slidable ring against the rotary shaft.
Inventors
- 👤 Yuji Yamauchi
- 👤 Kenji Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:54
CPC Classifications
G; G01; G01M; G01M13/00; G01M13/005; F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3492
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A method for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: detecting a displacement in a radial direction of said slidable ring as said rotary shaft rotates, detecting a displacement in a radial direction of said rotary shaft on which the mechanical seal is mounted as said rotary shaft rotates, and predicting abnormality of the mechanical seal by comparing the detected values of the displacements of the slidable ring and the rotary shaft.
Claim 2
Independent Claim
82 words
A method for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: detecting a displacement in a radial direction of said slidable ring as said rotary shaft rotates, detecting a displacement in a radial direction of said rotary shaft on which the mechanical seal is mounted as said rotary shaft rotates, and predicting abnormality of the mechanical seal by comparing the detected values of the displacements of the slidable ring and the rotary shaft.
Claim 3
Independent Claim
99 words
A method for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: detecting a displacement in a radial direction of said slidable ring as said rotary shaft rotates, detecting a displacement in a radial direction of said rotary shaft on which the mechanical seal is mounted as said rotary shaft rotates, and predicting abnormality of the mechanical seal by comparing the detected values of the displacements of the slidable ring and the rotary shaft wherein: predicting abnormality is carried out by drawing Lissajous' figure from the displacement and analysing the figure.
Claim 4
Independent Claim
99 words
A method for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: detecting a displacement in a radial direction of said slidable ring as said rotary shaft rotates, detecting a displacement in a radial direction of said rotary shaft on which the mechanical seal is mounted as said rotary shaft rotates, and predicting abnormality of the mechanical seal by comparing the detected values of the displacements of the slidable ring and the rotary shaft wherein: predicting abnormality is carried out by drawing Lissajous' figure from the displacement and analysing the figure.
Claim 5
Independent Claim
73 words
A method for predicting abnormality of a mechanical seal which includes a slidable ring surrounding a rotary shaft comprising: detecting a displacement both in a radial direction and in the axial direction of said slidable ring as said rotary shaft rotates, detecting a displacement in a radial direction of said rotary shaft as said rotary shaft rotates, and predicting abnormality of the mechanical seal from a plurality of the detected values of displacement.
Claim 6
Independent Claim
73 words
A method for predicting abnormality of a mechanical seal which includes a slidable ring surrounding a rotary shaft comprising: detecting a displacement both in a radial direction and in the axial direction of said slidable ring as said rotary shaft rotates, detecting a displacement in a radial direction of said rotary shaft as said rotary shaft rotates, and predicting abnormality of the mechanical seal from a plurality of the detected values of displacement.
Claim 7
Independent Claim
91 words
An apparatus for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: a sensor detecting a displacement in a radial direction of said slidable ring as said rotary shaft rotates, a sensor detecting a displacement in a radial direction of said rotary shaft upon which the mechanical seal is mounted as said rotary shaft rotates, and means for predicting abnormality of the mechanical seal by comparing the values of the displacements of the slidable ring and the rotary shaft detected by said sensors.
Claim 8
Independent Claim
91 words
An apparatus for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: a sensor detecting a displacement in a radial direction of said slidable ring as said rotary shaft rotates, a sensor detecting a displacement in a radial direction of said rotary shaft upon which the mechanical seal is mounted as said rotary shaft rotates, and means for predicting abnormality of the mechanical seal by comparing the values of the displacements of the slidable ring and the rotary shaft detected by said sensors.
Claim 9
Independent Claim
81 words
An apparatus for predicting abnormality of a mechanical seal comprising: a sensor detecting a displacement in a radial direction of a slidable ring of the mechanical seal, a sensor detecting a displacement in an axial direction of a slidable ring of the mechanical seal, a sensor detecting a displacement in the radial direction of a rotary shaft which the mechanical seal is mounted on, means for predicting abnormality of mechanical seal from the values of the displacement detected by said sensors.
Claim 10
Independent Claim
81 words
An apparatus for predicting abnormality of a mechanical seal comprising: a sensor detecting a displacement in a radial direction of a slidable ring of the mechanical seal, a sensor detecting a displacement in an axial direction of a slidable ring of the mechanical seal, a sensor detecting a displacement in the radial direction of a rotary shaft which the mechanical seal is mounted on, means for predicting abnormality of mechanical seal from the values of the displacement detected by said sensors.
Claim 11
Independent Claim
92 words
An apparatus for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: sensors detecting a displacement in a radial direction of said sildable ring at two or more points thereof as the rotary shaft rotates, and sensors detecting a displacement in a radial direction of said rotary shaft on which the mechanical seal is mounted at two or more points, thereof as said rotary shaft rotates, means for predicting abnormality of the mechanical seal from the values of the displacement detected by said sensors.
Claim 12
Independent Claim
92 words
An apparatus for predicting abnormality of a mechanical seal which includes a slidable ring mounted on a rotary shaft comprising: sensors detecting a displacement in a radial direction of said sildable ring at two or more points thereof as the rotary shaft rotates, and sensors detecting a displacement in a radial direction of said rotary shaft on which the mechanical seal is mounted at two or more points, thereof as said rotary shaft rotates, means for predicting abnormality of the mechanical seal from the values of the displacement detected by said sensors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |