US3638445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled condenser apparatus
Assignee: Carrier Corp
•
Filing: 1970-10-19
•
Granted: 1972-02-01
•
Expires: 1990-10-19
Abstract
Abstract A pair of fans are employed for circulating a flow of cooling air over a condensing coil. The fans are driven by constant speed reversible electric motors. A number of pressure responsive switches are installed in the coil and are operating successively upon rise and fall of pressure in the coil. The switches actuate motor control relays for selectively operating the motors in forward and reverse direction to vary the volume of airflow over the condensing coil according to the pressure therein.
Inventors
- 👤 William J Lavigne Jr
- 👤 Gordon L Mount
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:59
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/027; F28; F28B; F28B1/00; F28B1/06; F25B2600/00; F25B2600/11; F25B2600/111; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
An air-cooled condensing apparatus comprising a condenser coil, two fans operable to create an airflow over said coil in heat exchange relation thereto, a constant speed reversible motor operatively connected to each of said fans for driving the same, and a motor control means responsive to variable pressures in said coil for selectively operating said motors in forward and reverse directions to vary the volume of airflow over said coil according to the pressure therein.
Claim 2
Dependent Claim
75 words
An air-cooled condensing apparatus comprising a condenser coil, two fans operable to create an airflow over said coil in heat exchange relation thereto, a constant speed reversible motor operatively connected to each of said fans for driving the same, and a motor control means responsive to variable pressures in said coil for selectively operating said motors in forward and reverse directions to vary the volume of airflow over said coil according to the pressure therein.
Claim 3
Dependent Claim
21 words
Condenser apparatus as set forth in claim 1 wherein said fan motors are electric motors of the three-phase squirrel cage type.
Claim 4
Dependent Claim
37 words
Air-cooled condensing apparatus as set forth in claim 1 wherein said motor control means include a plurality of pressure responsive switches connected to said coil, each of said switches being operable in response to a preselected pressure.
Claim 5
Dependent Claim
103 words
An air-cooled condensing apparatus comprising a condensing coil, two fans operable to create an airflow over said coil in heat exchange relation thereto, a constant speed electric motor operatively connected to each of said fans for driving the same, a power supply for said motors, a plurality of switches mounted in said coil, each of said switches being operable in response to a predetermined pressure in said coil, relay means connected to said switches and operable, upon actuation thereof, to connect said fan motors to said power supply for operation in forward and reverse directions according to the pressure level in said coil.
Claim 6
Dependent Claim
103 words
An air-cooled condensing apparatus comprising a condensing coil, two fans operable to create an airflow over said coil in heat exchange relation thereto, a constant speed electric motor operatively connected to each of said fans for driving the same, a power supply for said motors, a plurality of switches mounted in said coil, each of said switches being operable in response to a predetermined pressure in said coil, relay means connected to said switches and operable, upon actuation thereof, to connect said fan motors to said power supply for operation in forward and reverse directions according to the pressure level in said coil.
References Cited (Backward Citations)
US3366167A
Cited
US3390539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |