US3887195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure shaft seal device
Assignee: Nuovo Pignone SpA
•
Filing: 1973-04-24
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Granted: 1975-06-03
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Expires: 1993-04-24
Abstract
Abstract A piston divides a high pressure cylinder into a forward and rear chamber. The forward chamber is charged with high pressure fluid from a blower whose shaft is to be sealed by oil. The rear chamber is charged with sealing oil and in communication with the shaft oil seal line. A rod extends from the face of the plunger facing the rear chamber through an aperture in the wall of the cylinder and provides a differential effective area across the piston. The piston is responsive to and maintained in a balance position in the cylinder by the opposing pressure forces, and the pressure in the rear chamber is greater than the forward chamber. The rod has an outwardly tapered portion at its free end which cooperates with the aperture to regulate the oil pressure.
Inventors
- 👤 Constantino Vinciguerra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:39
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/40; Y; Y10; Y10S; Y10S277/00; Y10S277/927
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
259 words
A device for accumulating and regulating high pressure oil for use in an oil shaft seal of a high working pressure gas blower, comprising: a high pressure metallic cylinder; a piston slidably positioned within said cylinder and dividing the interior thereof into a first chamber and second chamber; means for maintaining the first chamber in fluid communication with and charged by the gas in the blower; pump means for supplying high pressure oil from a source, conduit means for delivering said high pressure oil to said shaft seAl, said conduit means including a, branch line for delivering high pressure oil to said second chamber, and means located upstream of the branch line junction for preventing back flow of oil to said pump means, the cylinder defining a regulating port aligned with and in fluid communication with said second chamber; said piston having a rod extending therefrom through said port, said rod providing a differential pressure area across said piston to cause said second chamber to have a greater pressure than said first chamber, whereby gas is prevented from leaking into the second chamber; said rod further having an outwardly tapered crosssection adjacent its free end, whereby the rod cooperates with the port to vary the flow of oil therethrough in response to movement of said piston, said port being adapted to be closed when said pump means fails to deliver pressurized oil and the oil within said second chamber being delivered to the seal by the movement of the piston under influence of gas pressure in said first chamber.
Claim 2
Independent Claim
259 words
A device for accumulating and regulating high pressure oil for use in an oil shaft seal of a high working pressure gas blower, comprising: a high pressure metallic cylinder; a piston slidably positioned within said cylinder and dividing the interior thereof into a first chamber and second chamber; means for maintaining the first chamber in fluid communication with and charged by the gas in the blower; pump means for supplying high pressure oil from a source, conduit means for delivering said high pressure oil to said shaft seAl, said conduit means including a, branch line for delivering high pressure oil to said second chamber, and means located upstream of the branch line junction for preventing back flow of oil to said pump means, the cylinder defining a regulating port aligned with and in fluid communication with said second chamber; said piston having a rod extending therefrom through said port, said rod providing a differential pressure area across said piston to cause said second chamber to have a greater pressure than said first chamber, whereby gas is prevented from leaking into the second chamber; said rod further having an outwardly tapered crosssection adjacent its free end, whereby the rod cooperates with the port to vary the flow of oil therethrough in response to movement of said piston, said port being adapted to be closed when said pump means fails to deliver pressurized oil and the oil within said second chamber being delivered to the seal by the movement of the piston under influence of gas pressure in said first chamber.
Claim 3
Independent Claim
259 words
A device for accumulating and regulating high pressure oil for use in an oil shaft seal of a high working pressure gas blower, comprising: a high pressure metallic cylinder; a piston slidably positioned within said cylinder and dividing the interior thereof into a first chamber and second chamber; means for maintaining the first chamber in fluid communication with and charged by the gas in the blower; pump means for supplying high pressure oil from a source, conduit means for delivering said high pressure oil to said shaft seAl, said conduit means including a, branch line for delivering high pressure oil to said second chamber, and means located upstream of the branch line junction for preventing back flow of oil to said pump means, the cylinder defining a regulating port aligned with and in fluid communication with said second chamber; said piston having a rod extending therefrom through said port, said rod providing a differential pressure area across said piston to cause said second chamber to have a greater pressure than said first chamber, whereby gas is prevented from leaking into the second chamber; said rod further having an outwardly tapered cross-section adjacent its free end, whereby the rod cooperates with the port to vary the flow of oil therethrough in response to movement of said piston, said port being adapted to be closed when said pump means fails to deliver pressurized oil and the oil within said second chamber being delivered to the seal by the movement of the piston under influence of gas pressure in said first chamber.
Claim 4
Independent Claim
259 words
A device for accumulating and regulating high pressure oil for use in an oil shaft seal of a high working pressure gas blower, comprising: a high pressure metallic cylinder; a piston slidably positioned within said cylinder and dividing the interior thereof into a first chamber and second chamber; means for maintaining the first chamber in fluid communication with and charged by the gas in the blower; pump means for supplying high pressure oil from a source, conduit means for delivering said high pressure oil to said shaft seAl, said conduit means including a, branch line for delivering high pressure oil to said second chamber, and means located upstream of the branch line junction for preventing back flow of oil to said pump means, the cylinder defining a regulating port aligned with and in fluid communication with said second chamber; said piston having a rod extending therefrom through said port, said rod providing a differential pressure area across said piston to cause said second chamber to have a greater pressure than said first chamber, whereby gas is prevented from leaking into the second chamber; said rod further having an outwardly tapered cross-section adjacent its free end, whereby the rod cooperates with the port to vary the flow of oil therethrough in response to movement of said piston, said port being adapted to be closed when said pump means fails to deliver pressurized oil and the oil within said second chamber being delivered to the seal by the movement of the piston under influence of gas pressure in said first chamber.
Claim 5
Dependent Claim
42 words
A device according to claim 1, wherein the free end of the rod extends beyond said cylinder through said port to act as a visual check of the oil, the rod extension being proportional to volume of oil in the second chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |