US3785749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for two-stage compressors
Assignee: Phillips Petroleum Co
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Filing: 1972-03-24
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Granted: 1974-01-15
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Expires: 1992-03-24
Abstract
Abstract A control system for a first stage compressor and a second stage compressor provides for the startup of the compressors under no load conditions, and the operation of the compressors with intermittent supply of gases of widely varying pressures. The first stage is bypassed when the supply pressure is above a predetermined value.
Inventors
- 👤 R Perry
- 👤 B Whitson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:59
CPC Classifications
F; F04; F04B; F04B41/00; F04B41/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
388 words
Apparatus comprIsing a first stage compressor and a second stage compressor, each having an inlet and an outlet, a vessel containing gas to be at least partially evacuated, first conduit means connecting said vessel with the inlet of said first stage compressor, second conduit means connecting the outlet of said first stage compressor to the inlet of said second stage compressor, third conduit means connecting the outlet of said first stage compressor to the inlet of said first stage compressor, fourth conduit means connecting said vessel to the inlet of said second stage compressor, fifth conduit means connected to the outlet of said second stage compressor, for the withdrawal of compressed gases from the system, first valve means in said first conduit means adapted to interrupt the fluid communication between said vessel and the inlet of said first stage compressor, second valve means in said second conduit means adapted to interrupt the fluid communication between the outlet of said first stage compressor and the inlet of said second stage compressor, third valve means in said third conduit means adapted to interrupt the fluid communication between the outlet of said first stage compressor and the inlet of said first stage compressor, fourth valve means in said fourth conduit means adapted to interrupt the fluid communication between said vessel and the inlet of said second stage compressor, fifth valve means in said fifth conduit means, means for measuring a pressure representative of the gas pressure in said first conduit means upstream of said first valve means and in said fourth conduit means upstream of said fourth valve means, and control means for maintaining said third, fourth, and fifth valve means open and for maintaining said first and second valve means closed when the thus measured pressure exceeds a predetermined minimum high pressure operation value, for maintaining said third and fourth valve means closed and maintaining said first, second, and fifth valve means open when said measured pressure is greater than a minimum low pressure operation value and less than said predetermined high pressure operation value, and for maintaining said first, fourth and fifth valve means closed when said measured pressure is less than said minimum low pressure operation value, and means for driving said first and second stage compressors when said measured pressure exceeds said minimum low pressure operation value.
Claim 2
Dependent Claim
388 words
Apparatus comprIsing a first stage compressor and a second stage compressor, each having an inlet and an outlet, a vessel containing gas to be at least partially evacuated, first conduit means connecting said vessel with the inlet of said first stage compressor, second conduit means connecting the outlet of said first stage compressor to the inlet of said second stage compressor, third conduit means connecting the outlet of said first stage compressor to the inlet of said first stage compressor, fourth conduit means connecting said vessel to the inlet of said second stage compressor, fifth conduit means connected to the outlet of said second stage compressor, for the withdrawal of compressed gases from the system, first valve means in said first conduit means adapted to interrupt the fluid communication between said vessel and the inlet of said first stage compressor, second valve means in said second conduit means adapted to interrupt the fluid communication between the outlet of said first stage compressor and the inlet of said second stage compressor, third valve means in said third conduit means adapted to interrupt the fluid communication between the outlet of said first stage compressor and the inlet of said first stage compressor, fourth valve means in said fourth conduit means adapted to interrupt the fluid communication between said vessel and the inlet of said second stage compressor, fifth valve means in said fifth conduit means, means for measuring a pressure representative of the gas pressure in said first conduit means upstream of said first valve means and in said fourth conduit means upstream of said fourth valve means, and control means for maintaining said third, fourth, and fifth valve means open and for maintaining said first and second valve means closed when the thus measured pressure exceeds a predetermined minimum high pressure operation value, for maintaining said third and fourth valve means closed and maintaining said first, second, and fifth valve means open when said measured pressure is greater than a minimum low pressure operation value and less than said predetermined high pressure operation value, and for maintaining said first, fourth and fifth valve means closed when said measured pressure is less than said minimum low pressure operation value, and means for driving said first and second stage compressors when said measured pressure exceeds said minimum low pressure operation value.
Claim 3
Dependent Claim
87 words
Apparatus in accordance with claim 1 further comprising sixth conduit means connecting the outlet of said second stage compressor to the inlet of said first stage compressor, sixth valve means in said sixth conduit means adapted to interrupt the fluid communication between the outlet of said second stage compressor and the inlet of said first stage compressor, and wherein said control means further comprises means for maintaining said fourth valve means closed regardless of the value of the measured pressure unless said sixth valve means is closed.
Claim 4
Dependent Claim
99 words
Apparatus in accordance with claim 2 wherein said control means further comprises means for maintaining said second and third valve means open when said measured pressure is less than said minimum low pressure operation value, means for actuating said means for driving when the measured pressure increases from a value less than said minimum low pressure operation value to a value greater than said minimum low pressure operation value, and means for opening said fifth valve means and closing said sixth valve means at the end of a predetermined time period after the actuation of said means for driving.
Claim 5
Dependent Claim
88 words
Apparatus in accordance with claim 3 wherein said first conduit means contains a normally closed seventh valve means located therein at a point between said first valve means and the inlet of said first stage compressor, a pressure sensing means for determining the pressure at the inlet of said first stage compressor, and wherein said control means further comprises means for manipulating said seventh valve means responsive to the pRessure determined by said pressure sensing means only when said measured pressure exceeds said minimum low pressure operation value.
Claim 6
Dependent Claim
58 words
Apparatus in accordance with claim 4 wherein said first conduit means further comprises an eighth valve means contained therein at a point between said first valve means and said seventh valve means, and means for manipulating said eighth valve means responsive to the pressure in said first conduit means at the downstream side of said eighth valve means.
Claim 7
Dependent Claim
57 words
Apparatus in accordance with claim 1 further comprising a vent equalization vessel, sixth conduit means connecting said vent equalization vessel to said first conduit means at a point upstream of said first valve means, sixth valve means in said sixth conduit means adapted to interrupt fluid communication between said vent equilization vessel and said first conduit means.
References Cited (Backward Citations)
US1793633A
Cited
US3689197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |