Patent US4585185A successfully refreshed from Google Patents.
Patent US3600904A successfully refreshed from Google Patents.
US3600904A
Expired / Lapsed
US
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Control for refrigeration system
Assignee: Emerson Electric Co
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Filing: 1969-05-27
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Granted: 1971-08-24
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Expires: 1989-05-27
Abstract
Abstract A control in a refrigeration system to control the rate of flow of refrigerant to the evaporator in response to variations in rate of flow of liquid refrigerant from the evaporator. A sump in the suction line between the evaporator and compressor for collecting liquid discharged with vapor from the evaporator. A pump for pumping liquid at a controlled rate from the sump for mixture with the vapor supplied from the upper end of the sump to the compressor. A liquid level sensor for sensing changes in the level of liquid within the sump and for controlling operation of an expansion valve on the inlet side of the evaporator in response to variations of liquid within the sump.
Inventors
- 👤 Ralph B Tilney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/006; F25B41/00; F25B41/30; F25B41/31; F25B41/315; F25B2341/00; F25B2341/001; F25B2341/0011
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
233 words
In a refrigeration system having a compressor, a condenser, an expansion valve and an evaporator connected in series by tube means, the expansion valve having an opening for the passage of refrigerant, a control for controlling the expansion valve to regulate the rate of flow of refrigerant to the evaporator comprising, a sump, tube means leading from the outlet side of the evaporator to the sump, the tube means being connected into the sump at a point to permit liquid refrigerant to fall to the lower end of the sump with vapor remaining in the upper end of the sump above the liquid level therein, tube means for supplying vapor from the upper end of the sump to the suction side of the compressor, a head pump for withdrawing liquid from the sump at a predetermined rate of flow, the pump comprising a tube having an open upper end positioned above the liquid level within the sump, the tube extending downwardly through the sump and having its other end connected to the suction side of the compressor, and a metering hole in the side of the tube, the metering hole being positioned within the sump below the liquid level therein, and means to vary the size of the expansion valve opening in response to variations in liquid level within the sump to control the rate of flow of refrigerant through the expansion valve.
Claim 2
Dependent Claim
233 words
In a refrigeration system having a compressor, a condenser, an expansion valve and an evaporator connected in series by tube means, the expansion valve having an opening for the passage of refrigerant, a control for controlling the expansion valve to regulate the rate of flow of refrigerant to the evaporator comprising, a sump, tube means leading from the outlet side of the evaporator to the sump, the tube means being connected into the sump at a point to permit liquid refrigerant to fall to the lower end of the sump with vapor remaining in the upper end of the sump above the liquid level therein, tube means for supplying vapor from the upper end of the sump to the suction side of the compressor, a head pump for withdrawing liquid from the sump at a predetermined rate of flow, the pump comprising a tube having an open upper end positioned above the liquid level within the sump, the tube extending downwardly through the sump and having its other end connected to the suction side of the compressor, and a metering hole in the side of the tube, the metering hole being positioned within the sump below the liquid level therein, and means to vary the size of the expansion valve opening in response to variations in liquid level within the sump to control the rate of flow of refrigerant through the expansion valve.
Claim 3
Dependent Claim
40 words
The system of claim 1 wherein the means to vary the size of the expansion valve opening includes an element for alternately throttling and enlarging the expansion valve opening in response to rising and falling of liquid within the sump.
Claim 4
Dependent Claim
211 words
In a refrigeration system having a compressor, a condenser, an expansion valve and an evaporator connected in series by tube means, the expansion valve having an opening for the passage of refrigerant, a control for controlling the expansion valve to regulate the rate of flow of refrigerant to the evaporator comprising, a sump, tube means leading from the outlet side of the evaporator to the sump, the tube means being connected into the sump at a point to permit liquid refrigerant to fall to the lower end of the sump with vapor remaining in the upper end of the sump above the liquid level therein, tube means for supplying vapor from the upper end of the sump to the suction side of the compressor, an aspirating pump for withdrawing liquid from the sump at a predetermined rate of flow, the aspirating pump including a venturi section in the tube means for supplying vapor from the upper eNd of the sump to the compressor, and tube means leading from the lower end of the sump to the venturi section, and means to vary the size of the expansion valve opening in response to variations in liquid level within the sump to control the rate of flow of refrigerant through the expansion valve.
Claim 5
Dependent Claim
211 words
In a refrigeration system having a compressor, a condenser, an expansion valve and an evaporator connected in series by tube means, the expansion valve having an opening for the passage of refrigerant, a control for controlling the expansion valve to regulate the rate of flow of refrigerant to the evaporator comprising, a sump, tube means leading from the outlet side of the evaporator to the sump, the tube means being connected into the sump at a point to permit liquid refrigerant to fall to the lower end of the sump with vapor remaining in the upper end of the sump above the liquid level therein, tube means for supplying vapor from the upper end of the sump to the suction side of the compressor, an aspirating pump for withdrawing liquid from the sump at a predetermined rate of flow, the aspirating pump including a venturi section in the tube means for supplying vapor from the upper eNd of the sump to the compressor, and tube means leading from the lower end of the sump to the venturi section, and means to vary the size of the expansion valve opening in response to variations in liquid level within the sump to control the rate of flow of refrigerant through the expansion valve.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |