US3832084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivot for rotating molecular pumps
Assignee: Alcatel CIT SA
•
Filing: 1972-11-16
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Granted: 1974-08-27
•
Expires: 1992-11-16
Abstract
Abstract Pivot for rotating molecular pumps comprising a stator element fixed to the stator of the pump, a rotor element coupled to the rotor of the pump, and in the space comprised between the rotor and stator elements, a dynamic molecular seal, a dynamic viscous seal, several gas bearings, a gas stop and a gas counter-stop.
Inventors
- 👤 L Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/05; F04D29/056; F04D29/057; F04D19/00; F04D19/02; F04D19/04; F04D29/08; F04D29/10; F04D29/102; F16; F16C; F16C32/00; F16C32/06; F16C32/0681; F16C32/0696; F16C35/00; F16C35/08; F16C35/10
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
123 words
Pivot for use with various types of rotating molecular pumps of the type having a pump rotor and a pump stator; said pivot comprising: a stator element, stator connecting means for connecting said stator element to the pump stator, a rotor element rotatably mounted in an internal space formed in said stator element with slight play between said rotor element and said stator element, rotor connecting means for connecting said rotor element to said pump rotor, dynamic sealing means for sealing the opening between said stator element and said rotor element from adjacent pump structure, gas bearing means for radially supporting said rotor element in said stator element, and gas thrust bearing means for axially supporting said rotor element in said Stator element.
Claim 2
Dependent Claim
123 words
Pivot for use with various types of rotating molecular pumps of the type having a pump rotor and a pump stator; said pivot comprising: a stator element, stator connecting means for connecting said stator element to the pump stator, a rotor element rotatably mounted in an internal space formed in said stator element with slight play between said rotor element and said stator element, rotor connecting means for connecting said rotor element to said pump rotor, dynamic sealing means for sealing the opening between said stator element and said rotor element from adjacent pump structure, gas bearing means for radially supporting said rotor element in said stator element, and gas thrust bearing means for axially supporting said rotor element in said Stator element.
Claim 3
Dependent Claim
33 words
Pivot according to claim 1, wherein said rotor connecting means and stator connecting means include means for installing a rotating molecular pump in an overhanging position at the upper part of said pivot.
Claim 4
Dependent Claim
41 words
Pivot according to claim 2, wherein said dynamic sealing means includes a dynamic molecular seal arranged in said internal space adjacent the top of said pivot and a dynamic viscous seal arranged in said internal space below said dynamic molecular seal.
Claim 5
Dependent Claim
28 words
Pivot according to claim 3, wherein said gas bearing means include a plurality of axially spaced gas bearings arranged in said internal space below said dynamic viscous seal.
Claim 6
Dependent Claim
21 words
Pivot according to claim 4, wherein said gas thrust bearing means includes a gas thrust bearing and a gas counter-thrust bearing.
Claim 7
Dependent Claim
55 words
Pivot according to claim 2, wherein said stator connecting means includes a stator connecting part positionable between said pump stator and said stator element, and wherein said stator element includes a cutaway part formed on its outside surface, said stator connecting part and said cutaway part forming a stabilizer chamber for the gas bearing means.
Claim 8
Dependent Claim
55 words
Pivot according to claim 4, wherein said stator connecting means includes a stator connecting part positionable between said pump stator and said stator element, and wherein said stator element includes a cutaway part formed on its outside surface, said stator connecting part and said cutaway part forming a stabilizer chamber for the gas bearing means.
Claim 9
Dependent Claim
64 words
Pivot according to claim 2, wherein said gas thrust bearing means includes a gas thrust bearing and a gas counter-thrust bearing constituted by a ring of the rotor element rotating in a cavity formed in the stator element and held in a middle position in the cavity under the combined action of pressurized gas jets on respective upper and lower faces of said ring.
Claim 10
Dependent Claim
64 words
Pivot according to claim 6, wherein said gas thrust bearing means includes a gas thrust bearing and a gas counter-thrust bearing constituted by a ring of the rotor element rotating in a cavity formed in the stator element and held in a middle position in the cavity under the combined action of pressurized gas jets on respective upper and lower faces of said ring.
Claim 11
Dependent Claim
28 words
Pivot according to claim 3, wherein said molecular seal includes several grooves formed in the stator element and inclined at a certain angle in relation to the horizontal.
Claim 12
Dependent Claim
27 words
Pivot according to claim 10, wherein the depth of the grooves of the molecular seal decreases by degrees starting from the upper part of said molecular seal.
Claim 13
Dependent Claim
28 words
Pivot according to claim 3, wherein said viscous seal includes several grooves formed in the stator element and inclined at a certain angle in relation to the horizontal.
Claim 14
Dependent Claim
27 words
Pivot according to claim 12, wherein the depth of the grooves of the viscous seal decreases by degrees starting from the upper part of said viscous seal.
Claim 15
Dependent Claim
28 words
Pivot according to claim 12, wherein said molecular seal includes several grooves formed in the stator element and inclined at a certain angle in relation to the horizontal.
Claim 16
Dependent Claim
27 words
Pivot according to claim 14, wherein the depth of the grooves of the molecular seal decreases by degrees starting from the upper part of said molecular seal.
Claim 17
Dependent Claim
22 words
Pivot according to claim 10, wherein an intermediate space not having grooves is provided between the molecular seal and the viscous seal.
Claim 18
Dependent Claim
22 words
Pivot according to claim 14, wherein an intermediate space not having grooves is provided between the molecular seal and the viscous seal.
Claim 19
Dependent Claim
18 words
Pivot according to claim 16, wherein means for producing a partial vacuum in said intermediate space is provided.
Claim 20
Dependent Claim
18 words
Pivot according to claim 17, wherein means for producing a partial vacuum in said intermediate space is provided.
Claim 21
Dependent Claim
26 words
Pivot according to claim 2, wherein said gas bearing means includes two axially spaced gas bearings arranged in said internal space below said dynamic sealing means.
Claim 22
Dependent Claim
26 words
Pivot according to claim 9, whereIn said gas bearing means includes two axially spaced gas bearings arranged in said internal space below said dynamic sealing means.
Claim 23
Dependent Claim
26 words
Pivot according to claim 2, wherein said rotor element includes means for attaching to a rotor driving means at a position placed in the outside atmosphere.
Claim 24
Dependent Claim
26 words
Pivot according to claim 20, wherein gas exhaust grooves are formed in said stator element at positions axially spaced from gas inlets to said gas bearings.
Claim 25
Dependent Claim
28 words
Pivot according to claim 8, wherein gas exhaust openings communicate directly with the outer circumference of said ring for exhausting gases supplied to the thrust and counter-thrust bearings.
References Cited (Backward Citations)
US2730297A
Cited
DE1023679B
Cited
FR1203718A
Cited
FR1284111A
Cited
US3168977A
Cited
US3189264A
Cited
US3628894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |