Oil-cooled compressor

An oil-cooled compressor comprising:

• a compressor body;
• a discharge path extending from a discharge port of said compressor body;
• oil separating means disposed in said discharge path;
• an oil feed path for communicating said oil separating means to an oil feed portion of said compressor body so as to feed oil separated by said oil separating means to said compressor body, said oil feed path being branched at an intermediate position thereof into a first feed path portion and a second feed path portion;
• opening/closing means interposed in said first feed portion;
• pressure detecting means for detecting a discharge pressure, said pressure detecting means being disposed in said discharge path;
• and
• control means for controlling opening and closing of said opening/closing means on the basis of a relation between the discharge pressure detected by said pressure detecting means and a predetermined pressure value,
• wherein, given that nozzle areas in communicating portions of said first and second feed path portions for communication with said compressor body are S1 and S2, an oil quantity in which a discharge temperature Td becomes a lower-limit discharge temperature Tdmin, in a state of a discharge pressure pd being a highest discharge pressure Pdmax, is q0, the discharge pressure Pd and an oil quantity in a state of the discharge pressure Pd being decreased from this condition and the discharge temperature Td reaching an upper-limit discharge temperature Tdmax, are P1 and q1, respectively, and an oil quantity in which the discharge temperature Td becomes the upper-limit discharge temperature Tdmax in a state of the discharge pressure Pd being a lowest discharge pressure Pdmin, is q3, said S1, and S2 are set so that equations q1=C1×S1×(P1)1/2 and q3=C1×(S1+S2)×(Pdmin)1/2, both including a constant C1, are established.