A compressor configured for compressing a low-pressure gaseous refrigerant sucked therein to produce a high-pressure gaseous refrigerant to discharge, the compressor comprising: a suction pipe , configured to suck the low-pressure gaseous refrigerant, having a first pressure value; a discharge pipe , configured to discharge the high-pressure gaseous refrigerant, having a second pressure value, higher than the first pressure value; a first throttle portion (S1) for receiving an intermediate pressure refrigerant from an injection pipe of a refrigerant circuit , wherein the intermediate pressure refrigerant has an intermediate pressure value comprised between the first pressure value and the second pressure value; characterized in that it further comprises: an enlarged flow path portion (E) for receiving the intermediate pressure refrigerant from the first throttle portion (S1); a second throttle portion (S2) for receiving the intermediate pressure refrigerant from the enlarged flow path portion (E); and a compression element including a compression chamber for receiving the intermediate pressure refrigerant from the second throttle portion (S2), the first throttle portion (S1) has a flow path cross-sectional area (AS1) that is narrower than both a flow path cross-sectional area (AI) of the injection pipe and a flow path cross-sectional area (AE) of the enlarged flow path portion (E), and the second throttle portion (S2) has a flow path cross-sectional area (AS2) that is narrower than the flow path cross-sectional area (AE) of the enlarged flow path portion (E). a suction pipe , configured to suck the low-pressure gaseous refrigerant, having a first pressure value; a discharge pipe , configured to discharge the high-pressure gaseous refrigerant, having a second pressure value, higher than the first pressure value; a first throttle portion (S1) for receiving an intermediate pressure refrigerant from an injection pipe of a refrigerant circuit , wherein the intermediate pressure refrigerant has an intermediate pressure value comprised between the first pressure value and the second pressure value; characterized in that it further comprises: an enlarged flow path portion (E) for receiving the intermediate pressure refrigerant from the first throttle portion (S1); a second throttle portion (S2) for receiving the intermediate pressure refrigerant from the enlarged flow path portion (E); and a compression element including a compression chamber for receiving the intermediate pressure refrigerant from the second throttle portion (S2), the first throttle portion (S1) has a flow path cross-sectional area (AS1) that is narrower than both a flow path cross-sectional area (AI) of the injection pipe and a flow path cross-sectional area (AE) of the enlarged flow path portion (E), and the second throttle portion (S2) has a flow path cross-sectional area (AS2) that is narrower than the flow path cross-sectional area (AE) of the enlarged flow path portion (E). an enlarged flow path portion (E) for receiving the intermediate pressure refrigerant from the first throttle portion (S1); a second throttle portion (S2) for receiving the intermediate pressure refrigerant from the enlarged flow path portion (E); and a compression element including a compression chamber for receiving the intermediate pressure refrigerant from the second throttle portion (S2), the first throttle portion (S1) has a flow path cross-sectional area (AS1) that is narrower than both a flow path cross-sectional area (AI) of the injection pipe and a flow path cross-sectional area (AE) of the enlarged flow path portion (E), and the second throttle portion (S2) has a flow path cross-sectional area (AS2) that is narrower than the flow path cross-sectional area (AE) of the enlarged flow path portion (E). <EOS>