US4487034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy-efficient all-electric ECS for aircraft
Assignee: Lockheed Martin Corp
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Filing: 1983-08-03
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Granted: 1984-12-11
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Expires: 2003-08-03
Abstract
Abstract The invention is an energy-efficient all-electric environmental control system (70). The system includes a cabin compressor (16) and a Freon compressor (14), both of which are commonly driven by a two-speed electric motor (12). The motor (12) operates at low speed at low altitudes and on the ground to drive the Freon compressor (14). Freon fluid then cools the electric motor (12) and the cabin (18) and avionics (56) by means of the evaporator/dehumidifier systems (72) and (74), respectively. At high altitudes the electric motor (12) runs at high speed to drive the cabin compressor (16) to provide pressurization for the cabin (18). In this operation mode, the Freon compressor can be disconnected via an electromagnetic clutch (48). The ECS (70) also includes a liquid Freon pump (52) which can be utilized when the Freon compressor is disconnected or bypassed to circulate liquid Freon to cool the electric motor (12) and to circulate through the evaporators (38) and (76). The pump (52) is driven by an ac or dc motor (54).
Inventors
- 👤 Michael J. Cronin
- 👤 Gordon Seid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:55
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; F; F25; F25B; F25B27/00; F25B5/00; F25B5/02; B64D2013/0603; B64D2013/0614; B64D2013/0644; B64D2013/0688; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y02T50/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
In an aircraft environmental control system having an air cycle cooling system powered by an electrical motor and, an evaporative cooling sub-system coupled thereto, said cooling sub-system having a cooling circuit including fluid coolant, at least one coolant compressor coupled to said electric motor, and at least one coolant expansion means the improvement comprising: means to selectively disconnect said coolant compressor from said electric motor; said air cycle cooling system having means to bypass said at least one coolant expansion means and said at least one coolant compressor; and a liquid coolant pump for circulating said fluid coolant through said cooling circuit.
Claim 2
Dependent Claim
102 words
In an aircraft environmental control system having an air cycle cooling system powered by an electrical motor and, an evaporative cooling sub-system coupled thereto, said cooling sub-system having a cooling circuit including fluid coolant, at least one coolant compressor coupled to said electric motor, and at least one coolant expansion means the improvement comprising: means to selectively disconnect said coolant compressor from said electric motor; said air cycle cooling system having means to bypass said at least one coolant expansion means and said at least one coolant compressor; and a liquid coolant pump for circulating said fluid coolant through said cooling circuit.
Claim 3
Dependent Claim
21 words
An environmental control system as in claim 1 including an ac or dc motor adapted for driving said liquid coolant pump.
Claim 4
Dependent Claim
29 words
An environmental control system as in claim 1 wherein said ac or dc motor is adapted to be powered by ground support, aircraft primary and aircraft auxiliary power sources.
Claim 5
Dependent Claim
16 words
An environmental control system as in claim 3 wherein said clutch element comprises an electromagnetic clutch.
Claim 6
Dependent Claim
23 words
An environmental control system as in any one of claims 1 or 3 wherein said bypass means comprises at least one bypass valve.
Claim 7
Dependent Claim
21 words
An environmental control system as in claim 5 including an ac or dc motor adapted for driving said liquid coolant pump.
Claim 8
Dependent Claim
19 words
An environmental control system as in claim 5 wherein said first bypass means comprises at least one bypass valve.
Claim 9
Dependent Claim
94 words
In an aircraft environmental control system having an air cycle cooling system powered by an electric motor, an evaporative cooling sub-system coupled thereto, said cooling sub-system having a cooling circuit including fluid coolant, at least one coolant compressor coupled to said electric motor, and at least one coolant expansion means, the improvement comprising: said air cycle system having first means to bypass said at least one coolant compressor and second means to bypass said at least one coolant expansion means; and a liquid coolant pump for circulating said fluid coolant through said cooling circuit.
Claim 10
Dependent Claim
94 words
In an aircraft environmental control system having an air cycle cooling system powered by an electric motor, an evaporative cooling sub-system coupled thereto, said cooling sub-system having a cooling circuit including fluid coolant, at least one coolant compressor coupled to said electric motor, and at least one coolant expansion means, the improvement comprising: said air cycle system having first means to bypass said at least one coolant compressor and second means to bypass said at least one coolant expansion means; and a liquid coolant pump for circulating said fluid coolant through said cooling circuit.
Claim 11
Dependent Claim
29 words
An environmental control system as in claim 8 wherein said ac or dc motor is adapted to be powered by ground support, aircraft primary and aircraft auxiliary power sources.
Claim 12
Dependent Claim
24 words
An environmental control system as in any one of claims 5 or 9 wherein said second bypass means comprises at least one bypass valve.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |