Set of piston compressors and method for oil compensation
AssigneeCarrier Corporation
InventorsBernd Heinbokel, Heinz Gassen, Kai Munker
Life of this patent
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Abstract
A set of piston compressors (2, 4, 6, 8) for use in a refrigeration system comprises a fluid connection (10) between the crank cases of the piston compressors (2, 4, 6, 8) for allowing oil compensation between said piston compressors (2, 4, 6, 8); and a control unit (12) which in operation monitors the running time of each piston compressor (2, 4, 6, 8) and, in case all piston compressors (2, 4, 6, 8) are running, subsequently interrupts the operation of a respective piston compressor (2, 4, 6, 8) for a predetermined period of time for oil compensation if its running time reaches a predetermined maximum running time.
Claims19
A set of piston compressors for use in a refrigeration system, comprising:
- a fluid connection between the crank cases of the piston compressors for allowing oil compensation between said piston compressors;
- and
- a control unit which in operation monitors a running time of each piston compressor and, in case all piston compressors are running, subsequently interrupts the operation of a respective piston compressor for a predetermined period of time for oil compensation (TC) if its running time reaches a predetermined maximum running time (TO).
5-19. (canceled)
A set of piston compressors for use in a refrigeration system, comprising:
- a fluid connection between the crank cases of the piston compressors for allowing oil compensation between said piston compressors;
- and
- a control unit, which in case all piston compressors are running, monitors a common running time of the piston compressors, and, when the common running time reaches a predetermined maximum running time (TO),
- wherein the control unit sequentially interrupts the operation of a each piston compressor for a predetermined period of time for oil compensation (TC) while the others continue to run.
A method for oil compensation in a set of piston compressors, comprising the steps of:
- monitoring a running time of each piston compressor and, in case all piston compressors are running,
- interrupting the operation of a piston compressor for a predetermined period of time for oil compensation (TC) when its running time reaches a predetermined time of operation (TO).
A method for oil compensation in a set of piston compressors, comprising the steps of:
- monitoring a running time of the piston compressors and, in case all piston compressors are running and the running time reaches a predetermined time of operation (TO),
- interrupting the operation of a first piston compressor for a predetermined period of time for oil compensation (TC);
- and
- sequentially interrupting the operation of each additional piston compressor for a predetermined period of time for oil compensation (TC).
Dependencies are inferred from the claim text.