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US5243828A Expired / Lapsed US ⏱️ 0.0 years remaining

Control system for compressor protection in a manually operated refrigerant recovery apparatus

Assignee: Carrier Corp
•
Filing: 1992-12-28
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Granted: 1993-09-14
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Expires: 2012-12-28
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Abstract

Abstract A system for recovering compressible refrigerant from a refrigeration system, of the type having a compressor for lowering the pressure in the refrigeration system to effect the withdrawal of the refrigerant therefrom, and directing the refrigerant to a storage cylinder. The system is operable in a storage cylinder cooling mode of operation wherein the temperature and pressure of the refrigerant withdrawn from the system and stored in the cylinder is lowered. A control system for limiting the pressure ratio across the compressor during operation of the recovery system is provided. The control system includes first means for determining the suction pressure of the compressor and for terminating operation of the recovery system when a desired termination pressure is reached. A second means is provided for determining suction pressure of the compressor, and, for interrupting power to the compressor, and generating a signal perceivable to the user of the recovery system when a predetermined suction pressure greater than the termination pressure is reached. Means are provided for determining the discharge pressure of the compressor, and, for selectively placing the first means for determining suction pressure in the circuit of the control system when the discharge pressure is less than a predetermined value, or, for placing the second means for determining suction pressure in the control system when the discharge pressure equals or exceeds the predetermined value.

Inventors

  • 👤 Lowell E. Paige
  • 👤 Richard J. Duell

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 05:37
CPC Classifications
F; F25; F25B; F25B45/00; F25B2345/00; F25B2345/002; F25B2345/003

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 213 words
A system for recovering compressible refrigerant from a refrigeration system, of the type having a compressor for lowering the pressure in the refrigeration system to effect the withdrawal of refrigerant therefrom, and directing the refrigerant to a storage cylinder, the system being operable in a storage cylinder cooling mode of operation wherein the temperature and pressure of the refrigerant withdrawn from the system and stored in the cylinder is lowered, comprising: a control system for limiting the pressure ratio across the compressor during operation of the recovery system including; first means for determining the suction pressure of said compressor, and, for terminating operation of the recovery system when a desired termination pressure is reached; second means for determining the suction pressure of said compressor, and, for interrupting power to said compressor, and generating a signal perceivable to the user of the recovery system when a predetermined suction pressure greater than said termination pressure is reached; means for determining the discharge pressure of the compressor, and, for selectively placing said first means for determining suction pressure in said control system when the discharge pressure is less than a predetermined value; or, for placing said second means for determining suction pressure in the control system when the discharge pressure equals or exceeds said predetermined value.
Claim 2
Independent Claim 213 words
A system for recovering compressible refrigerant from a refrigeration system, of the type having a compressor for lowering the pressure in the refrigeration system to effect the withdrawal of refrigerant therefrom, and directing the refrigerant to a storage cylinder, the system being operable in a storage cylinder cooling mode of operation wherein the temperature and pressure of the refrigerant withdrawn from the system and stored in the cylinder is lowered, comprising: a control system for limiting the pressure ratio across the compressor during operation of the recovery system including; first means for determining the suction pressure of said compressor, and, for terminating operation of the recovery system when a desired termination pressure is reached; second means for determining the suction pressure of said compressor, and, for interrupting power to said compressor, and generating a signal perceivable to the user of the recovery system when a predetermined suction pressure greater than said termination pressure is reached; means for determining the discharge pressure of the compressor, and, for selectively placing said first means for determining suction pressure in said control system when the discharge pressure is less than a predetermined value; or, for placing said second means for determining suction pressure in the control system when the discharge pressure equals or exceeds said predetermined value.
Claim 3
Dependent Claim 15 words
The apparatus of claim 1 wherein said desired termination pressure is less than 0 PSIG.
Claim 4
Dependent Claim 14 words
The apparatus of claim 2 wherein said desired termination pressure is 10" Hg vacuum.
Claim 5
Dependent Claim 26 words
The apparatus of claim 1 wherein said predetermined suction pressure greater than said termination pressure is in the range between 5" Hg vacuum and 5 PSIG.
Claim 6
Dependent Claim 28 words
The apparatus of claim 1 wherein said desired termination pressure is 10" Hg vacuum, and wherein said predetermined suction pressure greater than said termination pressure is 0 PSIG.
Claim 7
Dependent Claim 23 words
The apparatus of claim 2 wherein said predetermined value of the discharge pressure is in the range of 140 PSIG to 160 PSIG.
Claim 8
Dependent Claim 38 words
The apparatus of claim 1 wherein said desired termination pressure is 10" Hg vacuum, said predetermined suction pressure greater than said termination pressure is 0 PSIG, and wherein said predetermined value of said discharge pressure is 150 PSIG.
Claim 9
Dependent Claim 21 words
The apparatus of claim 1 wherein said signal perceivable to the user comprises an indicator light visibly perceived by the user.

References Cited (Backward Citations)

JPH02169972A Cited
US5181390A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-09-13 1997-03-15 1997-09-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-09-13 2001-03-15 2001-09-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-09-13 2005-03-15 2005-09-14 $7700.00 Window Closed / Lapsed

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