Patent US4355948A successfully refreshed from Google Patents.
US4355948A
Expired / Lapsed
US
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Adjustable surge and capacity control system
Assignee: York International Corp
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Filing: 1981-02-17
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Granted: 1982-10-26
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Expires: 2001-02-17
Abstract
Abstract An adjustable surge and capacity control system for matching a capacity control system to an inverter-driven centrifugal compressor based liquid chiller having unknown surge characteristics. The necessary adaptation of the capacity control circuit to a particular chiller is attained by the provision of two potentiometers which are adjustable to develop a functional which avoids surge and operates the system in an efficient manner at all feasible operating point loads and heads. The use of a circuit employing a pair of potentiometers permits the formation of the appropriate functional with two degrees of shaping flexibility.
Inventors
- 👤 Kenneth J. Kountz
- 👤 Dean K. Norbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:31
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0246
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A method of controlling surge and capacity of an inverter driven centrifugal compressor refrigeration system comprising the steps of: deriving a signal indicating position of the adjustable inlet vanes of a centrifugal compressor of a refrigeration system, formulating a first output from said signal as a function of vane position, formulating a second output from said signal as a function of speed deviation of the compressor from minimum Mach number based on said vane position, and adjusting said first and second outputs to control the operation of a centrifugal compressor having unknown surging characteristics and avoid surge at all expected operating points.
Claim 2
Independent Claim
102 words
A method of controlling surge and capacity of an inverter driven centrifugal compressor refrigeration system comprising the steps of: deriving a signal indicating position of the adjustable inlet vanes of a centrifugal compressor of a refrigeration system, formulating a first output from said signal as a function of vane position, formulating a second output from said signal as a function of speed deviation of the compressor from minimum Mach number based on said vane position, and adjusting said first and second outputs to control the operation of a centrifugal compressor having unknown surging characteristics and avoid surge at all expected operating points.
Claim 3
Dependent Claim
26 words
The method according to claim 1 further comprising the steps of: deriving a third output indicating minimum Mach number, and combining said second and third output.
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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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |