Patent US3759052A successfully refreshed from Google Patents.
US3759052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling high stage and low stage compressors
Assignee: Mayekawa Manufacturing Co
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Filing: 1972-02-28
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Granted: 1973-09-18
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Expires: 1992-02-28
Abstract
Abstract This invention relates to a method of controlling high stage and low stage compressors having non-linear control characteristics. Said method is characterized by comprising the steps of controlling the capacity of the low stage compressor during operation in accordance with a change in the temperature of a load for an evaporator, automatically computing the square root of the product of the pressure at which gas is drawn by suction into the low stage compressor and the pressure at which gas is discharged from the high stage compressor or an approximation thereof by means of an automatic computing unit, comparing the output of the automatic computing unit with the pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and subordinatively controlling the ratio of the capacity of the low stage compressor to that of the high stage compressor by the result of the comparison.
Inventors
- 👤 W Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:03
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/10; F04; F04B; F04B41/00; F04B41/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
178 words
A method of controlling high stage and low stage compressors in a refrigeration system comprising automatically controlling the capacity of the low stage compressor during operation in accordance with a change in the temperature of the surface of the evaporator, automatically computing the square root of the product of a quantity of electricity which has been varied in accordance with a pressure at which gas is discharged from the high stage compressor and a quantity of electricity which has been varied in accordance with a pressure at which gas is drawn by suction into the low stage compressor by means of an automatic computing unit, comparing the output of the automatic computing unit with a quantity of electricity which has been varied in accordance with a pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and automatically controlling the capacity of the high stage compressor by the result of the comparison such that the output of the automatic computing unit becomes identical with the quantity of electricity corresponding to the intermediate cooler.
Claim 2
Independent Claim
178 words
A method of controlling high stage and low stage compressors in a refrigeration system comprising automatically controlling the capacity of the low stage compressor during operation in accordance with a change in the temperature of the surface of the evaporator, automatically computing the square root of the product of a quantity of electricity which has been varied in accordance with a pressure at which gas is discharged from the high stage compressor and a quantity of electricity which has been varied in accordance with a pressure at which gas is drawn by suction into the low stage compressor by means of an automatic computing unit, comparing the output of the automatic computing unit with a quantity of electricity which has been varied in accordance with a pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and automatically controlling the capacity of the high stage compressor by the result of the comparison such that the output of the automatic computing unit becomes identical with the quantity of electricity corresponding to the intermediate cooler.
Claim 3
Independent Claim
178 words
A method of controlling high stage and low stage compressors in a refrigeration system comprising automatically controlling the capacity of the low stage compressor during operation in accordance with a change in the temperature of the refrigerant in the evaporator, automatically computing the square root of the product of a quantity of electricity which has been varied in accordance with a pressure at which gas is discharged from the high stage compressor and a quantity of electricity which has been varied in accordance with a pressure at which gas is drawn by suction into the low stage compressor by means of an automatic computing unit, comparing the output of the automatic computing unit with a quantity of electricity which has been varied in accordance with a pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and automatically controlling the capacity of the high stage compressor by the result of the comparison such that the output of the automatic computing unit becomes identical with the quantity of electricity corresponding to the intermediate cooler.
Claim 4
Independent Claim
178 words
A method of controlling high stage and low stage compressors in a refrigeration system comprising automatically controlling the capacity of the low stage compressor during operation in accordance with a change in the temperature of the refrigerant in the evaporator, automatically computing the square root of the product of a quantity of electricity which has been varied in accordance with a pressure at which gas is discharged from the high stage compressor and a quantity of electricity which has been varied in accordance with a pressure at which gas is drawn by suction into the low stage compressor by means of an automatic computing unit, comparing the output of the automatic computing unit with a quantity of electricity which has been varied in accordance with a pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and automatically controlling the capacity of the high stage compressor by the result of the comparison such that the output of the automatic computing unit becomes identical with the quantity of electricity corresponding to the intermediate cooler.
Claim 5
Independent Claim
178 words
A method of controlling high stage and low stage compressors in a refrigeration system comprising automatically controlling the capacity of the low stage compressor during operation in accordance with a change in the pressure of the refrigerant in the evaporator, automatically computing the square root of the product of a quantity of electricity which has been varied in accordance with a pressure at which gas is discharged from the high stage compressor and a quantity of electricity which has been varied in accordance with a pressure at which gas is drawn by suction into the low stage compressor by means of an automatic computing unit, comparing the output of the automatic computing unit with a quantity of electricity which has been varied in accordance with a pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and automatically controlling the capacity of the high stage compressor by the result of the comparison such that the output of the automatic computing unit becomes identical with the quantity of electricity corresponding to the intermediate cooler.
Claim 6
Independent Claim
178 words
A method of controlling high stage and low stage compressors in a refrigeration system comprising automatically controlling the capacity of the low stage compressor during operation in accordance with a change in the pressure of the refrigerant in the evaporator, automatically computing the square root of the product of a quantity of electricity which has been varied in accordance with a pressure at which gas is discharged from the high stage compressor and a quantity of electricity which has been varied in accordance with a pressure at which gas is drawn by suction into the low stage compressor by means of an automatic computing unit, comparing the output of the automatic computing unit with a quantity of electricity which has been varied in accordance with a pressure of an intermediate cooler interposed between the low stage compressor and high stage compressor, and automatically controlling the capacity of the high stage compressor by the result of the comparison such that the output of the automatic computing unit becomes identical with the quantity of electricity corresponding to the intermediate cooler.
References Cited (Backward Citations)
US3011322A
Cited
US3665724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |