Patent US4672822A successfully refreshed from Google Patents.
US4672822A
Expired / Lapsed
US
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Refrigerating cycle apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1985-12-17
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Granted: 1987-06-16
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Expires: 2005-12-17
Abstract
Abstract The refrigerating cycle apparatus of the invention is provided with a pair of condenser and evaporator, two compressors, and a riser piping for rising therethrough a refrigerant and provided at a suction pipe for one compressor, the suction pipe for the other compressor being connected with the riser piping, so that even when the flood back condition occurs during the individual operation of the one compressor, both compressors are adapted to maintain a proper oil quantity therein.
Inventors
- 👤 Hitoshi Iijima
- 👤 Hiroaki Hama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:11
CPC Classifications
F; F25; F25B; F25B31/00; F25B31/002; F25B31/004; F25B1/00; F25B2400/00; F25B2400/07; F25B2400/075
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A refrigerating cycle apparatus, comprising: a condenser and an evaporator; first and second compressors connected with each other by an equalizer pipe for equalizing an internal oil amount in a shell of each of said first and second compressors; and a suction pipe for said first compressor being connected to a low pressure pipe at the outlet side of said evaporator, and a suction pipe for said second compressor being branched from said suction pipe for said first compressor; said suction pipe for said first compressor having a riser piping through which a refrigerant rises and said suction pipe for said second compressor is connected to said riser piping; and a by-pass pipe provided connecting the upstream side of said riser piping to said suction pipe for said second compressor; and a stop valve interposed within said by-pass pipe.
Claim 2
Dependent Claim
139 words
A refrigerating cycle apparatus, comprising: a condenser and an evaporator; first and second compressors connected with each other by an equalizer pipe for equalizing an internal oil amount in a shell of each of said first and second compressors; and a suction pipe for said first compressor being connected to a low pressure pipe at the outlet side of said evaporator, and a suction pipe for said second compressor being branched from said suction pipe for said first compressor; said suction pipe for said first compressor having a riser piping through which a refrigerant rises and said suction pipe for said second compressor is connected to said riser piping; and a by-pass pipe provided connecting the upstream side of said riser piping to said suction pipe for said second compressor; and a stop valve interposed within said by-pass pipe.
Claim 3
Dependent Claim
22 words
A refrigerating cycle apparatus as set forth in claim 1, wherein said stop valve at said by-pass pipe is a solenoid valve.
Claim 4
Dependent Claim
31 words
A refrigerating cycle apparatus as set forth in claim 1, wherein said riser piping is provided between an accumulator provided at the outlet side of said evaporator and said first compressor.
Claim 5
Dependent Claim
30 words
A refrigerating cycle apparatus as set forth in claim 1, wherein said by-pass pipe is provided between the bottom of said accumulator and said suction pipe for said second compressor.
Claim 6
Dependent Claim
22 words
A refrigerating cycle apparatus as set forth in claim 4, wherein said stop valve at said by-pass pipe is a solenoid valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |