Refrigerant compressor and refrigeration cycle apparatus using the same

A refrigerant compressor including a sealed case, a compression mechanism contained in the sealed case, a motor part which is contained in the sealed case and drives the compression mechanism via a crank shaft, and an oil reservoir formed in a lower portion of the sealed case,

• the refrigerant compressor further comprising:
• an oil supply pipe which links the oil reservoir in the sealed case and a suction side of the compression mechanism by a passage and introduces oil in the oil reservoir to the suction side;
• an oil supply amount adjusting means which is provided on the oil supply pipe and adjusts an amount of oil supply supplied to the suction side;
• a rotational speed detecting means which detects a rotational speed of the motor part;
• an oil supply amount controlling unit which controls the oil supply amount adjusting means according to a rotational speed detected by the rotational speed detecting means;
• a discharge pressure detecting means which detects a pressure in a discharge side of the refrigerant compressor;
• and
• a suction pressure detecting means which detects a pressure in a suction side of the refrigerant compressor,
• wherein the oil supply amount controlling unit controls the oil supply amount adjusting means in a manner that an amount of oil supply supplied to the suction side from the oil supply pipe decreases as a rotational speed of the motor part increases, and
• wherein the oil supply amount controlling unit controls the oil supply amount adjusting means so as to further decrease the amount of oil supply as a pressure difference between a discharge pressure detected by the discharge pressure detecting means and a suction pressure detected by the suction pressure detecting means increases.