US3737246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control method of compressors to be operated at constant speed
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1971-07-30
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Granted: 1973-06-05
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Expires: 1991-07-30
Abstract
Abstract In a compressor system comprising a low pressure compressor, an intermediate cooler and a high pressure compressor, wherein the compressors are operated at a constant speed, and the pressure distribution ratio is controlled to bring it to an optimum value, by employing a variable blade type compressor for said high pressure compressor and varying the setting angle of the stationary blades of said high pressure compressor according to the delivery pressure of its own, and thereby securing a safety operation and a wide operational range when said compressors are used in off-design.
Inventors
- 👤 T Shirato
- 👤 T Ogishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0246
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A compressor system comprising in combination a low pressure compressor, a high pressure compressor, said compressors being operable at constant speed and a cooler intermediate therebetween, characterized in that at least the high pressure compressor includes variable angle stationary blades, pressure transmitters (10, 11) disposed on suction and discharge sides, respectively, to detect pressure of said low pressure compressor and transmitting to a pressure ratio generator (15), the output signal of which is communicated to compensation operator (14) which also receives an output signal of a constant delivery pressure controller (13), differentiates the output signals of said ratio generator and said constant delivery pressure controller and transmits a resultant output signal to a high pressure operating cylinder (7) to adjust the setting angle of stationary blades of said high pressure compressor to provide a set value pressure ratio distribution.
Claim 2
Dependent Claim
139 words
A compressor system comprising in combination a low pressure compressor, a high pressure compressor, said compressors being operable at constant speed and a cooler intermediate therebetween, characterized in that at least the high pressure compressor includes variable angle stationary blades, pressure transmitters (10, 11) disposed on suction and discharge sides, respectively, to detect pressure of said low pressure compressor and transmitting to a pressure ratio generator (15), the output signal of which is communicated to compensation operator (14) which also receives an output signal of a constant delivery pressure controller (13), differentiates the output signals of said ratio generator and said constant delivery pressure controller and transmits a resultant output signal to a high pressure operating cylinder (7) to adjust the setting angle of stationary blades of said high pressure compressor to provide a set value pressure ratio distribution.
Claim 3
Independent Claim
148 words
A method of controlling a compressor system including an intermediate cooler, in which compressors are operated with a constant speed, by using high and low pressure compressors, both being a variable blade type, and with the delivery pressure of the high pressurE compressor being controlled by varying the setting angles of the stationary blades of both said high and low pressure compressors by the same amount, and characterized in that the varying of the setting angle of said stationary blades of the high pressure compressor is achieved by an operating cylinder responding to an output signal of a compensation operator, said output signal being the differential between an output signal of a constant delivery pressure controller and a pressure ratio signal of a pressure ratio generator, the input of said pressure ratio generator being derived from pressure-sensing transmitters, thereby the unbalance of the pressure ratio distribution is self-compensated.
Claim 4
Independent Claim
148 words
A method of controlling a compressor system including an intermediate cooler, in which compressors are operated with a constant speed, by using high and low pressure compressors, both being a variable blade type, and with the delivery pressure of the high pressurE compressor being controlled by varying the setting angles of the stationary blades of both said high and low pressure compressors by the same amount, and characterized in that the varying of the setting angle of said stationary blades of the high pressure compressor is achieved by an operating cylinder responding to an output signal of a compensation operator, said output signal being the differential between an output signal of a constant delivery pressure controller and a pressure ratio signal of a pressure ratio generator, the input of said pressure ratio generator being derived from pressure-sensing transmitters, thereby the unbalance of the pressure ratio distribution is self-compensated.
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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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |