OPERATION CONTROL DEVICE FOR FREEZER DEVICE

Japanese Patent JP3284588

B2

PURPOSE: To avoid a useless recovery of oil, maintain an operating efficiency or keep a superior comfortable feeling by a method wherein a freezer device is abnormally stopped by a hydraulic pressure protection device of which hydraulic pressure reaches its lower limit value and an oil recoverying operation is carried out when an accumulated operating time of a compressor reaches a predetermined time.
CONSTITUTION: A freezer device is abnormally stopped under an operation of a hydraulic pressure protection device 63QL as a pressure of lubricant oil in a compressor 1 reaches a value less than its lower limit value. In this case, the pressure of the lubricant oil in the compressor 1 is detected by a hydraulic pressure sensing means OP. In the case that the detected pressure of the lubricant oil is less than a set value set higher than the lower limit value and the accumulated operating time after a previous oil recoverying operation of the compressor 1 reaches the predetermined time, it is controlled by the oil recoverying operation control means 51 so as to perform the oil recoverying operation. That is, under a condition in which there is a surplus hydraulic pressure in it and in the case that the oil recovery is required, the oil recoverying operation is carried out. With such an arrangement, a useless oil recoverying operation is avoided and an operating efficiency or a comfortable air conditioning state is maintained in a well superior state.

Naoki Ueno
Hiroshi Okada
Hiroshi Asazuma

JP12378492A

May 20, 2002

May 15, 1992

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Daikin Industries, Ltd.

F25B1/00; F25B49/02; (IPC1-7): F25B1/00; F25B49/02

JP6373052A
JP310865B2

Hiroshi Maeda (2 outside)

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