Patent US3667247A successfully refreshed from Google Patents.
US3667247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system with evaporator outlet control valve
Assignee: Eaton Corp
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Filing: 1970-07-10
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Granted: 1972-06-06
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Expires: 1990-07-10
Abstract
Abstract Refrigerant flows from the compressor and condenser to the evaporator by a thermostatic expansion valve having its pressure and temperature sensing points in the suction line downstream of the evaporator outlet control valve which regulates the evaporator pressure relatively independently of the suction line conditions. When the compressor capacity significantly exceeds evaporator capacity this system provides additional compressor cooling at low suction pressures. The expansion valve may be the bulbless type or the externally equalized type. The outlet control valve may respond to refrigerant temperature at the coil outlet, or to fin temperature, or may be an evaporator pressure regulator valve.
Inventors
- 👤 Robert H Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:03
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/33; F25B41/335; F25B2341/00; F25B2341/06; F25B2341/068; F25B2341/0683; F25B2500/00; F25B2500/15; F25B2600/00; F25B2600/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A refrigeration system comprising, a compressor, a condenser receiving compressed refrigerant from the compressor, an evaporator coil, a thermostatic expansion valve regulating flow from the condenser to the evaporator coil, a suction line connecting the coil to the compressor inlet, an evaporator outlet control valve in the suction line and operative in response to a control condition to regulate flow from the coil to prevent freeze-up of the coil, said thermostatic expansion valve being responsive to both temperature and pressure in the suction line downstream of the evaporator outlet control valve and being cross charged to reduce the coil outlet superheat as the suction line pressure is reduced.
Claim 2
Dependent Claim
108 words
A refrigeration system comprising, a compressor, a condenser receiving compressed refrigerant from the compressor, an evaporator coil, a thermostatic expansion valve regulating flow from the condenser to the evaporator coil, a suction line connecting the coil to the compressor inlet, an evaporator outlet control valve in the suction line and operative in response to a control condition to regulate flow from the coil to prevent freeze-up of the coil, said thermostatic expansion valve being responsive to both temperature and pressure in the suction line downstream of the evaporator outlet control valve and being cross charged to reduce the coil outlet superheat as the suction line pressure is reduced.
Claim 3
Dependent Claim
87 words
A refrigeration system according to claim 1 in which the thermostatic expansion valve has a valve regulating flow to the coil and actuated by a diaphragm one side of which is subjected to pressure in a chamber cross changed with a medium responsive to temperature in the suction line downstream of the evaporator outlet control valve and the other side of the diaphragm being subjected to pressure in a chamber which pressure is a function of the suction line pressure downstream of the evaporator outlet control valve.
Claim 4
Dependent Claim
38 words
A refrigeration system according to claim 2 in which the evaporator outlet control valve is responsive to temperature or pressure to throttle flow from the coil to maintain minimum temperature and pressure conditions in the coil preventing freeze-up.
Claim 5
Dependent Claim
18 words
A refrigeration system according to claim 3 in which the evaporator outlet control valve responds to evaporator pressure.
Claim 6
Dependent Claim
22 words
A refrigeration system according to claim 3 in which the evaporator outlet control valve responds to the temperature of the coil fins.
Claim 7
Dependent Claim
21 words
A refrigeration system according to claim 3 in which the evaporator outlet control valve responds to refrigerant temperature in the coil.
Claim 8
Dependent Claim
30 words
The refrigeration system according to claim 2 in which the refrigerant flow from the evaporator outlet control valve passes directly over the temperature sensing point of the thermostatic expansion valve.
Claim 9
Dependent Claim
95 words
The refrigeration system according to claim 7 in which the thermostatic expansion valve includes a valve actuating pin connecting the diaphragm to the valve and the pin is hollowed out and communicates with the chamber on said one side of the diaphragm, a return conduit through the thermostatic expansion valve and forming part of the suction line, the hollowed portion of the pin being located in the return conduit whereby the temperature is sensed at the pin and the pressure in the return conduit communicates with the chamber on said other side of the diaphragm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |