US5189885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recirculating refrigeration system
Assignee: HA PHILLIPS & Co A Corp OF
•
Filing: 1991-11-08
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Granted: 1993-03-02
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Expires: 2011-11-08
Abstract
Abstract An improved gas pumping recirculating refrigeration system is disclosed. A controlled pressure flash tank provides flash gas for forcing liquid refrigerant from a dump tank. A controlled pressure receiver receives liquid from the dump tank and recirculates it to an evaporator. The flash gas pressure in the flash tank is controlled by a pressure regulator valve connected between the controlled pressure flash tank and the controlled pressure receiver. The pressure regulator valve may set so that the flash gas in the flash tank is at the pressure needed to force liquid from the dump tank. Thereby, optimum refrigeration efficiency is achieved with very little energy waste.
Inventors
- 👤 Shimao Ni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:08
CPC Classifications
F; F25; F25B; F25B45/00; F25B41/00; F25B41/20; F25B2400/00; F25B2400/13; F25B2400/16; F25B2400/23; F25B2600/00; F25B2600/25; F25B2600/2509; F25B2700/00; F25B2700/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
An improved gas pumping recirculation system for recirculating liquid refrigerant to an evaporator, the system comprising: a) a compressor in fluid connection with a condenser; b) said condenser in fluid connection with a flash tank; c) said flash tank in fluid connection with a receiver tank; d) said receiver tank in fluid connection with an evaporator; e) said evaporator in fluid connection with a surge drum; f) said surge drum in fluid connection with said compressor; g) said surge drum also in fluid connection with a dump tank such that liquid from said surge drum can flow into said dump tank; h) said dump tank also in fluid connection with said receiver tank such that liquid can flow from said dump tank into said receiver tank; i) said dump tank also in fluid connection with said flash tank such that flash gas from said flash tank can flow into said dump tank, thereby forcing liquid from said dump tank into said receiver; and j) a first regulator valve connected to said flash tank for regulating flash gas pressure in said flash tank, whereby the flash gas pressure may be set to the amount necessary to force liquid from said dump tank.
Claim 2
Dependent Claim
201 words
An improved gas pumping recirculation system for recirculating liquid refrigerant to an evaporator, the system comprising: a) a compressor in fluid connection with a condenser; b) said condenser in fluid connection with a flash tank; c) said flash tank in fluid connection with a receiver tank; d) said receiver tank in fluid connection with an evaporator; e) said evaporator in fluid connection with a surge drum; f) said surge drum in fluid connection with said compressor; g) said surge drum also in fluid connection with a dump tank such that liquid from said surge drum can flow into said dump tank; h) said dump tank also in fluid connection with said receiver tank such that liquid can flow from said dump tank into said receiver tank; i) said dump tank also in fluid connection with said flash tank such that flash gas from said flash tank can flow into said dump tank, thereby forcing liquid from said dump tank into said receiver; and j) a first regulator valve connected to said flash tank for regulating flash gas pressure in said flash tank, whereby the flash gas pressure may be set to the amount necessary to force liquid from said dump tank.
Claim 3
Dependent Claim
39 words
The system defined in claim 1 wherein said first regulator valve is connected between said flash tank and said receiver for maintaining a minimum pressure difference between said flash tank and said receiver, thereby controlling the flash gas pressure.
Claim 4
Dependent Claim
31 words
The system defined in claim 2 wherein a second regulator valve is connected to said receiver for controlling the pressure in said receiver and thereby further controlling the flash gas pressure.
Claim 5
Dependent Claim
32 words
The system defined in claim 1 wherein there are a plurality of evaporators, and said surge drum is replaced by an accumulator, which is connected to and services said plurality of evaporators.
Claim 6
Dependent Claim
90 words
The system defined in claim 1 wherein: a three-way valve connects said flash tank and a gas vent port of said surge drum to said dump tank; and said three-way valve may be controlled to connect said dump tank to said flash tank such that flash gas flows from said flash tank into said dump tank, or to connect said dump tank to said gas vent port of said surge drum such that gas pressure in said dump tank will become equal to the gas pressure in said surge drum.
Claim 7
Independent Claim
138 words
A method for recirculating liquid refrigerant in a refrigeration system comprising the steps of a) compressing refrigerant gas in a compressor; b) condensing said refrigerant gas to a liquid; c) storing said liquid in a flash tank; d) transferring said liquid to a receiver tank; e) transferring said liquid from said receiver tank to an evaporator, which transfers heat from the surrounding environment to said liquid, thereby flashing part of said liquid and creating a liquid/gas mixture; f) separating the liquid from said liquid/gas mixture and transferring said liquid to a dump tank; introducing flash gas from said flash tank into said dump tank for pumping liquid from said dump tank into said receiver; and h) attaching a pressure regulator valve to said flash tank for regulating the pressure of the flash gas introduced into said dump tank.
Claim 8
Independent Claim
138 words
A method for recirculating liquid refrigerant in a refrigeration system comprising the steps of a) compressing refrigerant gas in a compressor; b) condensing said refrigerant gas to a liquid; c) storing said liquid in a flash tank; d) transferring said liquid to a receiver tank; e) transferring said liquid from said receiver tank to an evaporator, which transfers heat from the surrounding environment to said liquid, thereby flashing part of said liquid and creating a liquid/gas mixture; f) separating the liquid from said liquid/gas mixture and transferring said liquid to a dump tank; introducing flash gas from said flash tank into said dump tank for pumping liquid from said dump tank into said receiver; and h) attaching a pressure regulator valve to said flash tank for regulating the pressure of the flash gas introduced into said dump tank.
Claim 9
Dependent Claim
46 words
The method defined in claim 6 including the step of: attaching said pressure regulator valve between said flash tank and said receiver tank such that the pressure of said flash gas is regulated by maintaining a pressure difference between said flash tank and said receiver tank.
Claim 10
Dependent Claim
37 words
The method defined in claim 7 including the step of: attaching a second pressure regulator valve to said receiver tank for controlling the pressure in said receiver and thereby further controlling the pressure of said flash gas.
Claim 11
Dependent Claim
26 words
The method defined in claim 6 including the step of: setting said flash gas pressure at the level needed to pump liquid from said dump tank.
References Cited (Backward Citations)
US1000723A
Cited
US1106287A
Cited
US1106244A
Cited
US2032286A
Cited
US2123021A
Cited
US2164081A
Cited
US2267152A
Cited
US2589859A
Cited
US2590741A
Cited
US2655008A
Cited
US2570979A
Cited
US2778195A
Cited
US2836966A
Cited
US2871673A
Cited
US2841962A
Cited
US2952137A
Cited
US3315484A
Cited
US3352124A
Cited
US3643460A
Cited
US3848425A
Cited
US3827249A
Cited
US4059968A
Cited
US3919859A
Cited
US3988904A
Cited
US4324106A
Cited
US4815298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-01 | 1996-08-31 | 1997-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-01 | 2000-08-31 | 2001-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-01 | 2004-08-31 | 2005-03-02 | $7700.00 | Window Closed / Lapsed |