Patent US3785169A successfully refreshed from Google Patents.
US3785169A
Expired / Lapsed
US
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Multiple compressor refrigeration system
Assignee: Daikin Applied Americas Inc
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Filing: 1972-06-19
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Granted: 1974-01-15
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Expires: 1992-06-19
Abstract
Abstract A multiple compressor refrigeration system having at least first and second hermetic shell compressors with the suction line of the system connected into the upper portion of the first compressor shell and a suction line extending from within the upper portion of the first compressor shell to within the upper portion of the shell of the second compressor and with the discharge lines of the first and second compressors connected in parallel to the high pressure line of the system. An oil equalizing conduit is connected between the crankcase portions of the shells of the first and second compressors at the height of the minimum desired oil level to be maintained in the first compressor when both compressors are running with normal quantities of oil in the system.
Inventors
- 👤 E Gylland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
F; F25; F25B; F25B31/00; F25B31/002; F04; F04B; F04B39/00; F04B39/02; F04B39/0207; F04B39/06; F04B39/12; F04B41/00; F04B41/06; F04C; F04C2270/00; F04C2270/24; F25B2400/00; F25B2400/07; F25B2400/075
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
200 words
A multiple compressor refrigeration system arrangement comprising, a first hermetic shell compressor intended to be always running when the system is operating, a second hermetic shell compressor that may be cycled on and off when the system is running, a first suction gas conduit adapted to be connected to the suction line of the system and extending into the upper portion of the shell of said first compressor, a second suction line extending from within the upper portion oF said first compressor shell to within the upper portion of said second compressor shell, a first high pressure discharge line extending from said first compressor and connected in parallel to a second high pressure discharge line extending from said second compressor and adapted to be connected to the high pressure line of said system, and an oil equalizing conduit, connected between the shells of said first and second compressors and connected to open into said first compressor at the height of minimum desired oil level to be maintained in said first compressor when said first and second compressors are both running with normal oil supply in the system and connected to open in said second compressor at substantially the same height.
Claim 2
Dependent Claim
200 words
A multiple compressor refrigeration system arrangement comprising, a first hermetic shell compressor intended to be always running when the system is operating, a second hermetic shell compressor that may be cycled on and off when the system is running, a first suction gas conduit adapted to be connected to the suction line of the system and extending into the upper portion of the shell of said first compressor, a second suction line extending from within the upper portion oF said first compressor shell to within the upper portion of said second compressor shell, a first high pressure discharge line extending from said first compressor and connected in parallel to a second high pressure discharge line extending from said second compressor and adapted to be connected to the high pressure line of said system, and an oil equalizing conduit, connected between the shells of said first and second compressors and connected to open into said first compressor at the height of minimum desired oil level to be maintained in said first compressor when said first and second compressors are both running with normal oil supply in the system and connected to open in said second compressor at substantially the same height.
Claim 3
Dependent Claim
20 words
The system of claim 1 in which the second suction line is of less diameter than said first suction line.
Claim 4
Dependent Claim
24 words
The system of claim 1 in which the second suction line extends into the shell of said first compressor beyond the inner surface thereof.
Claim 5
Dependent Claim
52 words
The invention of claim 1 in which a crankcase heater is disposed in the shell of said second compressor beneath the level of oil to be normally maintained when said second compressor is cycled to be not running, said heater being adapted to be energized when said second compressor is not running.
References Cited (Backward Citations)
US2175913A
Cited
US2294552A
Cited
US2253623A
Cited
US2663164A
Cited
US3274796A
Cited
US3386262A
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 |