Patent US3877246A successfully refreshed from Google Patents.
US3877246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning for aircraft cabins
Assignee: Vereinigte Flugtechnische Werke Fokker GmbH
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Filing: 1974-07-15
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Granted: 1975-04-15
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Expires: 1994-07-15
Abstract
Abstract An air conditioning system uses available compressed air (e.g., from an engine compressor) and feeds it into a cascade of two decompression compressors, a heat exchanger and a moisture precipitator which discharges into the cabin. Air is bled off the cabin to maintain a particular pressure, but a return flow for air from the cabin is also maintained, such air being cleaned and compressed, chilled and mixed with the tapped air. The mixing stage is provided upstream of the second turbine but downstream of the first one. The compressed return flow air is either cooled before mixing in a separate cooling circuit, or is added to the tapped air flow upstream of the heat exchanger. Turbines and heat exchanger are bypassed individually or jointly for temperature control. One or both turbines drive the compressor for the return flow of air, both turbines or the other one drive normally a blower for drawing air through the heat exchanger as recipient for thermal energy.
Inventors
- 👤 Horst Schutze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:16
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D2013/0603; B64D2013/0651; B64D2013/0688; Y; Y02; Y02T; Y02T50/00; Y02T50/40
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
243 words
A system for climate control, heating and air conditioning of an aircraft cabin, comprising: first means for providing pressurized air; a first decompressing turbine having a high pressure input side and a low pressure output side; heat exchange means including first flow path defining means for passage of air to be cooled and second flow path defining means for passage of a coolant; a second decompressing turbine, also having a high pressure input side and a low pressure output side; flow conduction means for connecting the first and second turbines and the said first flow path of the heat exchange means in series and to the first means in such a manner that the second turbine is connected downstream from the first turbine as well as from the heat exchange means; a precipitator for removing precipitated moisture and connected to receive decompressed air from the output of the second turbine, air flowing from the precipitator into the aircraft cabin; second means including cleaning filter means for drawing air from the cabin; a compressor driven by one of the turbines and connected to the second means for compressing cleaned air as drawn from the cabin; a mixing stage included in the conduit means and connected for receiving the air as compressed by the compressor; and a bleeder valve for maintaining a particular pressure in the cabin, so that not all of the air entering the cabin from the precipitator is returned through the filter.
Claim 2
Independent Claim
243 words
A system for climate control, heating and air conditioning of an aircraft cabin, comprising: first means for providing pressurized air; a first decompressing turbine having a high pressure input side and a low pressure output side; heat exchange means including first flow path defining means for passage of air to be cooled and second flow path defining means for passage of a coolant; a second decompressing turbine, also having a high pressure input side and a low pressure output side; flow conduction means for connecting the first and second turbines and the said first flow path of the heat exchange means in series and to the first means in such a manner that the second turbine is connected downstream from the first turbine as well as from the heat exchange means; a precipitator for removing precipitated moisture and connected to receive decompressed air from the output of the second turbine, air flowing from the precipitator into the aircraft cabin; second means including cleaning filter means for drawing air from the cabin; a compressor driven by one of the turbines and connected to the second means for compressing cleaned air as drawn from the cabin; a mixing stage included in the conduit means and connected for receiving the air as compressed by the compressor; and a bleeder valve for maintaining a particular pressure in the cabin, so that not all of the air entering the cabin from the precipitator is returned through the filter.
Claim 3
Dependent Claim
34 words
A system as in claim 1, wherein a blower is provided, being driven by one of the turbines and drawing air as coolant through the said second flow path of the heat exchanger means.
Claim 4
Dependent Claim
23 words
A system as in claim 2, wherein the compressor is driven by the second turbine, the blower being driven by the first turbine.
Claim 5
Dependent Claim
21 words
A system as in claim 3, wherein the blower and the compressor are driven by the respective turbine via concentric shafts.
Claim 6
Dependent Claim
15 words
A system as in claim 2, wherein both turbines drive the compressor and the blower.
Claim 7
Dependent Claim
28 words
A system as in claim 2, including a controlled bypass for the blower operative when the coolant is provided as air entering the heat exchanger under dynamic pressure.
Claim 8
Dependent Claim
21 words
A system as in claim 1, the air as compressed by the compressor being also passed through the heat exchanging means.
Claim 9
Dependent Claim
43 words
A system as in claim 7, the mixing stage being connected ahead of the heat exchange means so that the exchange means chills the combined air as provided by the first means and as mixed with the air as compressed by the compressor.
Claim 10
Dependent Claim
26 words
A system as in claim 8, first turbine connected so that the mixing stage receives air from the first means as decompressed in the first turbine.
Claim 11
Dependent Claim
43 words
A system as in claim 7, the heat exchange means having two separate circuits as first flow path, the air from the first means passing through one of the circuits, the air from the compressor passing through the other one of the circuits.
Claim 12
Dependent Claim
50 words
A system as in claim 10, the first and second turbines connected serially to the output side of the one circuit of the heat exchange means the mixed stage connected between the first and second turbines, receiving the compressed air from the output side of the other heat exchange circuit.
Claim 13
Dependent Claim
68 words
A system as in claim 1, the first flow path of the heat exchange means being connected between the low pressure output side of the first turbine and the high pressure input side of the second turbine, the mixing stage connected upstream and to the input side of the first flow path of the heat exchange means so that the mixed air pasSed through the heat exchange means.
Claim 14
Dependent Claim
18 words
A system as in claim 12, including a valve controlled bypass for at least one of the turbines.
Claim 15
Dependent Claim
20 words
A system as in claim 1, the mixing stage connected so that the mixed air passes through the second turbine.
Claim 16
Dependent Claim
94 words
A system as in claim 1, the heat exchange means having first and second circuits as first flow path, the first circuit connected to the input of the first turbine, the mixing stage connected between the output of the first turbine and the input of the second turbine, the output of the compressor being connected via the second circuit to the mixing stage, so that compressed and cleaned air as drawn from the cabin is mixed with air as decompressed in the first turbine, the air as mixed being decompressed in the second turbine.
Claim 17
Dependent Claim
15 words
A system as in claim 15 and including a controlled bypass around the second turbine.
Claim 18
Dependent Claim
37 words
A system as in claim 15, including a valve controlled bypass around the first circuit of the heat exchange means for temperature control of the air from the first means before being fed to the mixing stage.
Claim 19
Dependent Claim
37 words
A system as in claim 15 and including a valve controlled bypass connection as between the output side of the first circuit of the heat exchange means and the output of the first turbine, bypassing the same.
Claim 20
Dependent Claim
51 words
A system as in claim 18, and including a blower driven by the first turbine to draw air through the second flow path of the heat exchange means, further including a bypass for the blower to be effective when flow through the second flow path is sustained dynamically through ram pressure.
Claim 21
Dependent Claim
49 words
A system as in claim 15 and including an additional inlet nozzle for the second turbine for increasing the effective cross-section of air flow into the second turbine, the nozzle bypassing the input side of the second turbine but connected downstream from the output side of the mixing stage.
Claim 22
Dependent Claim
18 words
A system as in claim 1 and including a valve controlled bypass around the first and second turbines.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |