US3807490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning system for vehicles, particularly for rail cars
Assignee: Alex Friedmann KG
•
Filing: 1972-03-20
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Granted: 1974-04-30
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Expires: 1992-03-20
Abstract
Abstract An air conditioning system for vehicles includes separate cooling and heating units, and a coolant vaporizer located in the ducts upstream of the air heater. Coolant circulation means circulates coolant between a cold-vapor boiler and a vaporizer means. Independent hot-water circulation means circulates hot water between a heat exchanger and the air heater and, since the water-containing chamber is connected in series to the hot water circulation means, the two units can be operated both separately and simultaneously. Such a system therefore permits pure cooling when the cooling unit alone is operated, permits pure heating when the heating unit alone is operated, and further permits a dehumidifying operation when both the heating and cooling units are operated.
Inventors
- 👤 I Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:34
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/0018
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
In an air conditioning system for vehicles, especially for rail cars, having an air conditioning assembly including air blower means and ducts conducting the air from said means to vehicle passenger compartments to be air conditioned, comprising in combination: a heating unit comprising a heat exchanger, an oil burner for firing said heat exchanger, at least one air heater located in said ducts, hot water circulation means for circulating hot water between said heat exchanger and said air heater, a circulation pump in said circulation means; a cooling unit comprising a cold-vapor boiler, a watercontaining chamber located within a coolant-containing chamber, coolant vaporizer means in said ducts adjacent said air blower means and disposed upstream of said air heater, coolant circulation means for circulating coolant between said coldvapor boiler and said vaporizer means, a first heater means for said cold-vapor boiler comprising electric heating elements located in said water-containing chamber, said water-containing chamber being connected in series to said hot-water circulation means thereby defining a second heater means for said coldvapor boiler.
Claim 2
Dependent Claim
172 words
In an air conditioning system for vehicles, especially for rail cars, having an air conditioning assembly including air blower means and ducts conducting the air from said means to vehicle passenger compartments to be air conditioned, comprising in combination: a heating unit comprising a heat exchanger, an oil burner for firing said heat exchanger, at least one air heater located in said ducts, hot water circulation means for circulating hot water between said heat exchanger and said air heater, a circulation pump in said circulation means; a cooling unit comprising a cold-vapor boiler, a watercontaining chamber located within a coolant-containing chamber, coolant vaporizer means in said ducts adjacent said air blower means and disposed upstream of said air heater, coolant circulation means for circulating coolant between said coldvapor boiler and said vaporizer means, a first heater means for said cold-vapor boiler comprising electric heating elements located in said water-containing chamber, said water-containing chamber being connected in series to said hot-water circulation means thereby defining a second heater means for said coldvapor boiler.
Claim 3
Dependent Claim
74 words
In the system according to claim 1 wherein said hot-water circulation means includes air inlet conduit on said heat exchanger, a virst conduit interconnecting said inlet conduit and said air heater, a second conduit interconnecting said heat exchanger and said air heater, said circulation pump being located on said second conduit, a third conduit interconnecting said inlet conduit and said water-containing chamber, and a fourth conduit interconnecting said second conduit and said water-containing chamber.
Claim 4
Dependent Claim
36 words
In the system according to claim 2 wherein a first valve is located on said second conduit between said circulation pump and said air heater, and wherein a second valve is located on said fourth conduit.
Claim 5
Dependent Claim
59 words
In the system according to claim 1, further comprising a pressure-equalizing reservoir connected to said second conduit, said reservoir having a diaphragm therein separating said reservoir and two chambers, one of said reservoir chambers communicating with said second conduit and the other of said reservoir chambers being operatively connected to a compressed air source thereby constituting an equalizing chamber.
References Cited (Backward Citations)
US2332149A
Cited
US3153442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |