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Title: Dual capacity compressor with reversible motor and controls arrangement therefor

Abstract

A hermetic reciprocating compressor such as may be used in heat pump applications is provided for dual capacity operation by providing the crankpin of the crankshaft with an eccentric ring rotatably mounted thereon, and with the end of the connecting rod opposite the piston encompassing the outer circumference of the eccentric ring, with means limiting the rotation of the eccentric ring upon the crankpin between one end point and an opposite angularly displaced end point to provide different values of eccentricity depending upon which end point the eccentric ring is rotated to upon the crankpin, and a reversible motor in the hermetic shell of the compressor for rotating the crankshaft, the motor operating in one direction effecting the angular displacement of the eccentric ring relative to the crankpin to the one end point, and in the opposite direction effecting the angular displacement of the eccentric ring relative to the crankpin to the opposite end point, this arrangement automatically giving different stroke lengths depending upon the direction of motor rotation. The mechanical structure of the arrangement may take various forms including at least one in which any impact of reversal is reduced by utilizing lubricant passages and chambers at the interfacemore » area of the crankpin and eccentric ring to provide a dashpot effect. In the main intended application of the arrangement according to the invention, that is, in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction of compressor operation. A control arrangement is provided in which the control system controls the direction of motor operation in accordance with temperature conditions, the system including control means for effecting operation in a low capacity direction or alternatively in a high capacity direction in response to one set, and another set, respectively, of temperature conditions and with timer means delaying a restart of the compressor motor for at least a predetermined time in response to a condition of the control means operative to initiate a change in the operating direction of the compressor when it restarts.« less

Inventors:
 [1]
  1. (Washington Township, Fayette County, PA)
Issue Date:
OSTI Identifier:
863733
Patent Number(s):
4236874
Application Number:
06/016,638
Assignee:
Westinghouse Electric Corp. (Pittsburgh, PA) OSTI
DOE Contract Number:  
86X-24172C
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
dual; capacity; compressor; reversible; motor; controls; arrangement; hermetic; reciprocating; heat; pump; applications; provided; operation; providing; crankpin; crankshaft; eccentric; rotatably; mounted; thereon; connecting; rod; opposite; piston; encompassing; outer; circumference; means; limiting; rotation; angularly; displaced; provide; values; eccentricity; depending; rotated; shell; rotating; operating; direction; effecting; angular; displacement; relative; automatically; giving; stroke; lengths; mechanical; structure; various; forms; including; impact; reversal; reduced; utilizing; lubricant; passages; chambers; interface; dashpot; effect; main; intended; application; according; refrigerating; air; conditioning; desirable; insure; delay; control; accordance; temperature; conditions; alternatively; response; set; respectively; timer; delaying; restart; predetermined; time; condition; operative; initiate; change; restarts; mounted thereon; angular displacement; connecting rod; control arrangement; air conditioning; opposite direction; temperature conditions; rotatably mounted; predetermined time; heat pump; control means; reciprocating compressor; stroke length; various forms; outer circumference; reversible motor; motor operation; dual capacity; intended application; hermetic shell; means operative; means limit; mechanical structure; determined time; /417/74/

Citation Formats

Sisk, Francis J. Dual capacity compressor with reversible motor and controls arrangement therefor. United States: N. p., 1980. Web.
Sisk, Francis J. Dual capacity compressor with reversible motor and controls arrangement therefor. United States.
Sisk, Francis J. Tue . "Dual capacity compressor with reversible motor and controls arrangement therefor". United States. https://www.osti.gov/servlets/purl/863733.
@article{osti_863733,
title = {Dual capacity compressor with reversible motor and controls arrangement therefor},
author = {Sisk, Francis J.},
abstractNote = {A hermetic reciprocating compressor such as may be used in heat pump applications is provided for dual capacity operation by providing the crankpin of the crankshaft with an eccentric ring rotatably mounted thereon, and with the end of the connecting rod opposite the piston encompassing the outer circumference of the eccentric ring, with means limiting the rotation of the eccentric ring upon the crankpin between one end point and an opposite angularly displaced end point to provide different values of eccentricity depending upon which end point the eccentric ring is rotated to upon the crankpin, and a reversible motor in the hermetic shell of the compressor for rotating the crankshaft, the motor operating in one direction effecting the angular displacement of the eccentric ring relative to the crankpin to the one end point, and in the opposite direction effecting the angular displacement of the eccentric ring relative to the crankpin to the opposite end point, this arrangement automatically giving different stroke lengths depending upon the direction of motor rotation. The mechanical structure of the arrangement may take various forms including at least one in which any impact of reversal is reduced by utilizing lubricant passages and chambers at the interface area of the crankpin and eccentric ring to provide a dashpot effect. In the main intended application of the arrangement according to the invention, that is, in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction of compressor operation. A control arrangement is provided in which the control system controls the direction of motor operation in accordance with temperature conditions, the system including control means for effecting operation in a low capacity direction or alternatively in a high capacity direction in response to one set, and another set, respectively, of temperature conditions and with timer means delaying a restart of the compressor motor for at least a predetermined time in response to a condition of the control means operative to initiate a change in the operating direction of the compressor when it restarts.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {12}
}

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