Patent US3797265A successfully refreshed from Google Patents.
US3797265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized refrigerant feed with recirculation
Assignee: Frick Co Inc
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Filing: 1973-01-03
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Granted: 1974-03-19
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Expires: 1993-01-03
Abstract
Abstract A pressure accumulator receives liquid refrigerant from the receiver and supplies it to the evaporators. Liquid from the evaporators is temporarily stored in an upper accumulator from which it may drain to a drum which can be pressurized to return it to the pressure accumulator. A gaseous refrigerant connection from the receiver supplies pressure for the accumulator and for defrosting the evaporators, the arrangement eliminating the need for individual back pressure valves for each evaporator or group of evaporators during defrosting.
Inventors
- 👤 M Garland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:47
CPC Classifications
F; F25; F25B; F25B45/00; F25B1/00; F25B31/00; F25B31/002; F25B2400/00; F25B2400/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
182 words
A refrigeration system comprising means for supplying liquid refrigerant and for compressing and condensing refrigerant vapor, a pressure accumulator having a first inlet from the supplying means for liquid refrigerant, means to control the flow to said inlet in accordance with the level of liquid refrigerant in the pressure accumulator, a second inlet into said pressure accumulator, said second inlet connected to receive refrigerant vapor from the liquid supplying means, means to control the flow to said second inlet in accordance with the pressure in said pressure accumulator, evaporator means, means connecting said pressure accumulator to said evaporator means for supplying liquid refrigerant thereto, a separator accumulator, means connecting said evaporator means to said separator accumulator, said separator accumulator connected to the compressing means, a drain drum, a drain line from said separator accumulator to said drain drum, means for applying pressure to the refrigerant within said drain drum, means connecting the lower portion of said drain drum with said pressure accumulator, whereby liquid from said separator may flow to said drain drum and from said drain drum to said pressure accumulator.
Claim 2
Dependent Claim
182 words
A refrigeration system comprising means for supplying liquid refrigerant and for compressing and condensing refrigerant vapor, a pressure accumulator having a first inlet from the supplying means for liquid refrigerant, means to control the flow to said inlet in accordance with the level of liquid refrigerant in the pressure accumulator, a second inlet into said pressure accumulator, said second inlet connected to receive refrigerant vapor from the liquid supplying means, means to control the flow to said second inlet in accordance with the pressure in said pressure accumulator, evaporator means, means connecting said pressure accumulator to said evaporator means for supplying liquid refrigerant thereto, a separator accumulator, means connecting said evaporator means to said separator accumulator, said separator accumulator connected to the compressing means, a drain drum, a drain line from said separator accumulator to said drain drum, means for applying pressure to the refrigerant within said drain drum, means connecting the lower portion of said drain drum with said pressure accumulator, whereby liquid from said separator may flow to said drain drum and from said drain drum to said pressure accumulator.
Claim 3
Dependent Claim
53 words
The invention of claim 1 in which said means for increasing the pressure in said drain drum comprises means responsive to the level of liquid in said drain drum, means connecting a refrigerant vapor line from the liquid supplying means with said drain drum, said means controlled by the level within said drum.
Claim 4
Dependent Claim
129 words
The invention of claim 2 in which said means responsive to the level of liquid in said drain drum comprises upper and lower liquid level responsive switches, first pressure responsive valve means in said line from the lower portion of said upper accumulator to said drain drum, said pressure responsive valve means connected to said refrigerant vapor line, second pressure responsive valve means in said refrigerant vapor line, means connecting said pressure responsive valve means to the upper portion of said separator accumulator through valve control means, means connecting the upper portion of said drain drum to the upper portion of said separator accumulator through a second valve control means, said first and second valve control means being operable in response to said upper and lower level responsive switches.
Claim 5
Dependent Claim
31 words
The invention of claim 1 in which said means for applying pressure to the refrigerant within said drain drum includes switch means responsive to the liquid level in said pressure accumulator.
Claim 6
Dependent Claim
102 words
The invention of claim 1, and means for defrosting said evaporator means, comprising valve control means connecting a refrigerant vapor line from the liquid supplying means with the outlet of said evaporator means, valve means in the means connecting said evaporator means to said separator accumulator, said valve means being normally open and connected to said refrigerant vapor line, whereby said valve means is closed when the refrigerant vapor line is open, and one-way flow means connecting the inlet of said evaporator means to said pressure accumulator, whereby refrigerant in said evaporator means may be returned to said pressure accumulator during defrosting.
Claim 7
Dependent Claim
34 words
The invention of claim 3 in which means is provided in the connecting means from the inlet of the evaporator means to the pressure accumulator for regulating the pressure in the evaporator during defrosting.
Claim 8
Dependent Claim
129 words
A refrigeration system comprising means for supplying liquid refrigerant and for compressing and condensing refrigerant vapor, a pressure accumulator having an inlet from the supplying means, means to regulate the pressure within the pRessure accumulator, evaporator means, means connecting the pressure accumulator to the evaporator means, a separator accumulator, means connecting the evaporator means to the separator accumulator, suction line means connecting the separator accumulator to the compressing means, a drain drum, a first drain line connecting the separator accumulator to said drain drum, a second drain line connecting said drain drum to the pressure accumulator, a heat source, means connecting the heat source to the evaporator means for defrosting the same, and one-way means connecting the evaporator means to the pressure accumulator for returning refrigerant thereto during defrosting.
Claim 9
Dependent Claim
129 words
A refrigeration system comprising means for supplying liquid refrigerant and for compressing and condensing refrigerant vapor, a pressure accumulator having an inlet from the supplying means, means to regulate the pressure within the pRessure accumulator, evaporator means, means connecting the pressure accumulator to the evaporator means, a separator accumulator, means connecting the evaporator means to the separator accumulator, suction line means connecting the separator accumulator to the compressing means, a drain drum, a first drain line connecting the separator accumulator to said drain drum, a second drain line connecting said drain drum to the pressure accumulator, a heat source, means connecting the heat source to the evaporator means for defrosting the same, and one-way means connecting the evaporator means to the pressure accumulator for returning refrigerant thereto during defrosting.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |