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US3779031A Expired / Lapsed US ⏱️ 0.0 years remaining

Air-conditioning system for cooling dehumidifying or heating operations

Assignee: Hitachi Ltd
•
Filing: 1971-08-19
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Granted: 1973-12-18
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Expires: 1991-08-19
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Abstract

Abstract An air conditioner comprising a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger, a first capillary tube, a second capillary tube, a third capillary tube, a first valve, a second valve and a piping communicating said elements with each other, said compressor communicating with one side of said outdoor heat exchanger and said first indoor heat exchanger, the other side of said outdoor heat exchanger communicating with one side of said first capillary tube and said second capillary tube, the other side of said first capillary tube communicating with the other side of said first indoor heat exchanger, the other side of said second capillary tube communicating with one side of said second indoor heat exchanger, the other side of said second indoor heat exchanger and said compressor communicating with each other by said second valve, a series circuit of said second capillary tube and said second indoor heat exchanger and said first valve being connected in parallel with each other, said third capillary tube being connected between the side of said first indoor heat exchanger closer to said first capillary tube and the side of said second indoor heat exchanger closer to said second capillary tube, said first valve being closed and said second valve being opened during a cooling operation, and said first valve being opened and said second valve being closed during a dehumidifying operation.

Inventors

  • 👤 M Akiyama
  • 👤 S Suzuki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 17:52
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1405; F24F3/153; F25; F25B; F25B13/00; F25B41/00; F25B41/20; F25B2313/00; F25B2313/023; F25B2313/027; F25B2313/02791; F25B2600/00; F25B2600/25; F25B2600/2507

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 236 words
An air conditioner comprising a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger, a first capillary tube, a second capillary tube, a third capillary tube, a first valve, a second valve and a piping communicating said elements with each other, said compressor communicating with one side of said outdoor heat exchanger and said first indoor heat exchanger, the other side of said outdoor heat exchanger communicating with one side of said first capillary tube and said second capillary tube, the other side of said first capillary tube tibe communicating with the other side of said first indoor heat exchanger, the other side of said second capillary tube communicating with one side of said second indoor heat exchanger, the other side of said second indoor heat exchanger and said compressor communicating with each other by said second valve, a series circuit of said second capillary tube and said second indoor heat exchanger and said first valve being connected in parallel with each other, said third capillary tube being connected between the side of said first indoor heat exchanger closer to said first capillary tube and the side of said second indoor heat exchanger closer to said second capillary tube, said first valve being closed and said second valve being opened during a cooling operation, and said first valve being opened and said second valve being closed during a dehumidifying operation.
Claim 2
Dependent Claim 236 words
An air conditioner comprising a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger, a first capillary tube, a second capillary tube, a third capillary tube, a first valve, a second valve and a piping communicating said elements with each other, said compressor communicating with one side of said outdoor heat exchanger and said first indoor heat exchanger, the other side of said outdoor heat exchanger communicating with one side of said first capillary tube and said second capillary tube, the other side of said first capillary tube tibe communicating with the other side of said first indoor heat exchanger, the other side of said second capillary tube communicating with one side of said second indoor heat exchanger, the other side of said second indoor heat exchanger and said compressor communicating with each other by said second valve, a series circuit of said second capillary tube and said second indoor heat exchanger and said first valve being connected in parallel with each other, said third capillary tube being connected between the side of said first indoor heat exchanger closer to said first capillary tube and the side of said second indoor heat exchanger closer to said second capillary tube, said first valve being closed and said second valve being opened during a cooling operation, and said first valve being opened and said second valve being closed during a dehumidifying operation.
Claim 3
Dependent Claim 28 words
An air conditioner as defined in claim 1, wherien a four-way valve is disposed between the compressor, and the outdoor heat exchanger and the first indoor heat exchanger.
Claim 4
Dependent Claim 91 words
An air conditioner as defined in claim 2, wherein said second valve is a three-way valve including a first pipe communicating with said first valve; a second pipe communicating with said second indoor heat exchanger; a third pipe, operatively connected to said compressor; and a piston, operatively movable by pressure differential of a refrigerant, such that said refrigerant flows between said first pipe and said second pipe, when said first valve is open, and said refrigerant flows between said second pipe and said third pipe, when said first valve is closed.
Claim 5
Dependent Claim 91 words
An air conditioner as defined in claim 1, wherein said second valve is a three-way valve including a first pipe communicating with said first valve; a second pipe communicating with said second indoor heat exchanger; a third pipe, operatively connected to said compressor; and a piston, operatively movable by pressure differential of a refrigerant, such that said refrigerant flows between said first pipe and said second pipe, when said first valve is open, and said refrigerant flows between said second pipe and said third pipe, when said first valve is closed.

References Cited (Backward Citations)

US2961844A Cited
US2932178A Cited
US3293874A Cited
US3460353A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-17 1977-06-18 1977-12-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-17 1981-06-18 1981-12-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-17 1985-06-18 1985-12-18 $7700.00 Window Closed / Lapsed

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