US3832935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston cylinder engine with pressurized piston rod seal
Assignee: MAN AG
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Filing: 1973-04-19
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Granted: 1974-09-03
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Expires: 1993-04-19
Abstract
Abstract To seal the piston rod through an end wall of the cylinder, the piston rod is formed with a bore in which a sealing packing is located. In the wall, between the bore and outside surface of the wall, a pressure chamber is formed surrounding the piston rod into which a pressure fluid is introduced, to press the packing material against the piston rod, provide lubrication for sliding movement between the piston rod and the packing, and effect a gas-tight seal during such sliding movement. Any pressurized fluid which may leak into the cylinder is carried off by the cylinder by a drain which is periodically isolated from the interior of the piston by a valve, to permit accumulated leakage fluid to be drained off. For a vertical piston, the drain may be located at the lowest point of a slightly inclined bottom wall surface, or to drain from a groove formed at the outside circumference of the bottom wall. The drain is preferably blocked by a sump at the time the piston reaches the lowest dead center position, to permit drainage of the sump.
Inventors
- 👤 O Syassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:59
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/40; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/0535; F02G2253/00; F02G2253/03
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
Piston-cylinder engine having a cylinder (1), a piston (2) having a piston rod (6) secured thereto and mounted for reciprocation in the cylinder, the cylinder having a closed end wall (17) facing the piston at the side where the rod is connected thereto, the wall (17) being formed with a bore (7) through which the rod (6) passes; and means sealing the piston rod (6) in the bore (7) to separate the interior of the cylinder from ambient air outside of the cylinder end wall, in gas-tight relation, comprising a sealing packing (8) located in the wall (17) and surrounding the piston rod (6); a pressure chamber (9) formed in the end wall (17) surrounding the piston rod (6) and located between the sealing packing and the outside surface of the wall (17); means (10, 11) introducing a pressure fluid into the chamber to bias the packing (8) against the rod, lubricate the rod in the packing, and provide a fluid seal; and closable fluid drain means (13) connecting the inside surface of the wall (17) with the outside of the cylinder to drain any leakage fluid escaping from the pressure chamber (9) through the sealing packing (8) into the interior of the cylinder.
Claim 2
Dependent Claim
204 words
Piston-cylinder engine having a cylinder (1), a piston (2) having a piston rod (6) secured thereto and mounted for reciprocation in the cylinder, the cylinder having a closed end wall (17) facing the piston at the side where the rod is connected thereto, the wall (17) being formed with a bore (7) through which the rod (6) passes; and means sealing the piston rod (6) in the bore (7) to separate the interior of the cylinder from ambient air outside of the cylinder end wall, in gas-tight relation, comprising a sealing packing (8) located in the wall (17) and surrounding the piston rod (6); a pressure chamber (9) formed in the end wall (17) surrounding the piston rod (6) and located between the sealing packing and the outside surface of the wall (17); means (10, 11) introducing a pressure fluid into the chamber to bias the packing (8) against the rod, lubricate the rod in the packing, and provide a fluid seal; and closable fluid drain means (13) connecting the inside surface of the wall (17) with the outside of the cylinder to drain any leakage fluid escaping from the pressure chamber (9) through the sealing packing (8) into the interior of the cylinder.
Claim 3
Dependent Claim
31 words
Engine according to claim 1, wherein the fluid communication means (13) terminates at the inner surface of the end wall (17) with an enlargement (13'') in form of a collecting funnel.
Claim 4
Dependent Claim
43 words
Engine according to claim 1, wherein the closable fluid connection means (13) terminates at the inside surface of the end wall, and the inside surface is inclined slightly towards said termination to pRovide for drainage of leakage fluid towards said connection means (13).
Claim 5
Dependent Claim
26 words
Engine according to claim 3, wherein the bottom surface of the piston is slightly inclined towards said termination means matching the inclination of the end wall.
Claim 6
Dependent Claim
45 words
Engine according to claim 1, further comprising a fluid vessel (14) in the drain fluid connection means (13); and valve means (15, 16) selectively connecting the fluid vessel (14) through the connection means with the interior of the cylinder or to an outside drain, respectively.
Claim 7
Dependent Claim
63 words
Engine according to claim 5, further comprising control means (18) selectively alternately opening and closing said valve means (15, 16) in synchronism with operation of the piston in the cylinder to open communication between the vessel and the cylinder at the time the piston is at bottom dead center position, and to open connection of the vessel to the drain at other times.
Claim 8
Dependent Claim
27 words
Engine according to claim 1, further comprising cooling means (19) located in the cylinder in the region of termination of the fluid communication means in the cylinder.
Claim 9
Dependent Claim
26 words
Engine according to claim 1, further comprising an additional sealing ring (12) located between the pressure chamber (9) and the outside surface of the end wall.
Claim 10
Dependent Claim
41 words
Engine according to claim 1, wherein the cylinder is formed at the bottom with a leakage collection groove (30, 30''), said groove communicating with the fluid connection means (13); and cooling means are located in the cylinder surrounding the collection groove.
Claim 11
Dependent Claim
33 words
Engine according to claim 1, wherein the cylinder is formed at the bottom with a leakage fluid collection groove (30'') surrounding the bore (7), said groove communicating with the fluid collection means (13).
Claim 12
Dependent Claim
34 words
Engine according to claim 1, wherein hot gas is dispose in the cylinder space above the piston, and cold gas is located in the cylinder space beneath the piston; wherein said gas is helium.
Claim 13
Dependent Claim
11 words
Engine according to claim 1, wherein the pressure fluid is water.
Claim 14
Dependent Claim
14 words
Engine according to claim 12, wherein the sealing packing (8) comprises plastic packing rings.
Claim 15
Dependent Claim
47 words
Engine according to claim 1, wherein a working gas is disposed in the cylinder space beneath the piston and wherein the pressure fluid is a liquid having a boiling point within a narrow range and comprises a substance which is inert with respect to the working gas.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |