US3760478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for assembling a rotary sliding vane compressor
Assignee: Borg Warner Corp
•
Filing: 1971-10-04
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Granted: 1973-09-25
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Expires: 1991-10-04
Abstract
Abstract An optimum clearance is established at the contact point of the compressor''s rotor and cylinder, within which cylinder the rotor is eccentrically rotated to provide a crescent-shaped compression chamber, to minimize friction at that point while at the same time minimizing leakage therethrough from the high to the low pressure side of the compression chamber. This is achieved by initially coating the rotor''s cylindrical surface with a selflubricating material, such as TEFLON. Thereafter, when assembling the compressor, the cylinder is pivoted relative to the rear bearing plate until it engages the rotor and provides a contact point with zero clearance. To maintain this precise alignment, holes are then drilled and reamed through the front plate and into the cylinder and through the cylinder and into the rear plate, after which dowel pins are driven into the holes. When the compressor subsequently operates in its intended environment and under normal operating conditions, thermal diferentials between the rotor and cylinder may cause expansion of at least one of those elements as a result of which the self-lubricating material wears until a desired very close sealing fit, with minimum friction, is established at the contact point thereby optimizing the clearance thereat.
Inventors
- 👤 L Harlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:54
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/10; F01C21/08; F01C21/0809; F01C21/0818; F01C21/0854; F01C21/0872; F04; F04C; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/3441; F04C29/00; F04C29/02; F04C29/025; F04C2230/00; F04C2230/60; F04C2230/603; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49245; Y10T29/49826; Y10T29/4984; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
243 words
A method for assembling a rotary sliding vane compressor wherein a slotted rotor, with an external cylindrical surface of self-lubricating material, has its drive shaft journalled in bearings of parallel spaced front and rear bearing plates to rotatably mount the rotor eccentrically within an internal cylindrical wAll of a cylinder positioned between the bearing plates thereby to provide, between the cylindrical surface and wall and between the bearing plates, a crescent-shaped compression chamber having high and low pressure sides sealed from each other, and in which dowel pins extend between the cylinder and front and rear plates to maintain their alignment and to prevent any shifting of those three elements relative to each other, the method comprising the steps of: rotatably mounting the drive shaft in the bearing of the rear plate; positioning the cylinder around the rotor and adjacent to the rear plate; pivoting the cylinder relative to the rear plate to establish a contact point, between the rotor''s cylindrical surface and the cylinder''s cylindrical wall, that provides a line-to-line sealing fit with zero clearance; holding the front and rear plates, cylinder and rotor in assembled relationship; drilling and reaming at least one hole parallel to the rotor''s axis and through portions of the front plate and the cylinder, and drilling and reaming at least one other hole parallel to the rotor''s axis and through portions of the cylinder and rear plate; and driving a dowel pin into each of the holes.
Claim 2
Independent Claim
243 words
A method for assembling a rotary sliding vane compressor wherein a slotted rotor, with an external cylindrical surface of self-lubricating material, has its drive shaft journalled in bearings of parallel spaced front and rear bearing plates to rotatably mount the rotor eccentrically within an internal cylindrical wAll of a cylinder positioned between the bearing plates thereby to provide, between the cylindrical surface and wall and between the bearing plates, a crescent-shaped compression chamber having high and low pressure sides sealed from each other, and in which dowel pins extend between the cylinder and front and rear plates to maintain their alignment and to prevent any shifting of those three elements relative to each other, the method comprising the steps of: rotatably mounting the drive shaft in the bearing of the rear plate; positioning the cylinder around the rotor and adjacent to the rear plate; pivoting the cylinder relative to the rear plate to establish a contact point, between the rotor''s cylindrical surface and the cylinder''s cylindrical wall, that provides a line-to-line sealing fit with zero clearance; holding the front and rear plates, cylinder and rotor in assembled relationship; drilling and reaming at least one hole parallel to the rotor''s axis and through portions of the front plate and the cylinder, and drilling and reaming at least one other hole parallel to the rotor''s axis and through portions of the cylinder and rear plate; and driving a dowel pin into each of the holes.
Claim 3
Dependent Claim
47 words
A method according to claim 1 in which at least one of the holes, through which the dowel pins are driven, is drilled through the front plate and into the cylinder, while at least one other hole is drilled through the cylinder and into the rear plate.
Claim 4
Dependent Claim
45 words
A method according to claim 1 in which, prior to the drilling and reaming steps, a plurality of sub-assembly bolts are extended through the front plate and cylinder and screwed into the rear plate to hold the plates, cylinder and the rotor in assembled relationship.
Claim 5
Dependent Claim
45 words
A method according to claim 3 in which, after the dowel pins are driven into place, a plurality of main assembly studs are extended through the plates and cylinder and are then capped with nuts to provide additional forces to hold the assembled compressor together.
Claim 6
Dependent Claim
44 words
A method according to claim 1 in which the cylinder is pivoted relative to the rear plate, to establish the zero clearance contact point between the rotor and cylinder, by means of a locating pin extended through the cylinder and into the rear plate.
Claim 7
Dependent Claim
42 words
A method according to claim 1 in which the enumerated steps are performed while the plane of the rear plate is generally horizontally positioned such that the cylinder and front plate must be mounted above and on top of the rear plate.
Claim 8
Dependent Claim
16 words
A method according to claim 1 in which the self-lubricating material constitutes a coating of TEFLON.
Claim 9
Dependent Claim
68 words
A method according to claim 1 in which, when the compressor operates in its intended environment and under normal operating conditions, thermal differentials between the rotor and cylinder may cause expansion of at least one of those elements as a result of which the self-lubricating material on the rotor''s cylinrical surface wears until a desired very close sealing fit, with minimum friction, is established at the contact point.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |