Dual capacity compressor with reversible motor and controls arrangement therefor

Patent · Tue Dec 02 00:00:00 EST 1980

OSTI ID:863733

Sisk, Francis J ^[1]

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1. Washington Township, Fayette County, PA

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.

• DOE Contract Number: 86X-24172C
• Assignee: Westinghouse Electric Corp. (Pittsburgh, PA)
• Patent Number(s): US 4236874
• Application Number: 06/016,638
• OSTI ID: 863733
• Country of Publication: United States
• Language: English

Related Subjects

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/