Compression device and control mass flow separation method

A device for the compression of a gaseous fluid comprising a housing with a suction pressure chamber and a high pressure chamber, a compression mechanism as well as a configuration implemented in the proximity of the high pressure chamber for the separation of a control mass flow from a main mass flow comprising a fluid-lubricant mixture for the control of the compression mechanism, wherein the fluid lubricant mixture comprises a mixture of gaseous refrigerant and oil, and wherein the oil is a liquid, wherein the configuration comprises a first flow duct for diverting the main mass flow of the compressed fluid-lubricant mixture from the device and a second flow duct for separating a mass flow of the gaseous fluid, said gaseous fluid comprising the gaseous refrigerant, as the control mass flow from the main mass flow and conducting the control mass flow within the device to the suction pressure chamber,

• wherein the gaseous refrigerant is separated from the mixture of gaseous refrigerant and oil in the first flow duct and flows into the second flow duct;
• wherein a first expansion element is disposed downstream of the second flow duct,
• wherein the control mass flow comprises a gaseous refrigerant;
• wherein the liquid comprises an oil;
• wherein the gaseous refrigerant separated from the mixture of gaseous refrigerant and oil in the first flow duct flows into the second flow duct;
• wherein oil separated from the mixture of gaseous refrigerant and oil in the first flow duct is deposited in a lower region of the high-pressure chamber;
• and
• wherein the mixture of gaseous refrigerant and oil not separated in the first flow duct flows into a refrigerant circulation;
• wherein the second flow duct is developed to open out in the direction of flow of the control mass flow into a high pressure duct and at the outlet of the high pressure duct the first expansion element is disposed for relieving the control mass flow from a high pressure level to an intermediate pressure level, wherein the control mass flow is conducted into a region of the housing that is charged with gaseous fluid at the level of the intermediate pressure;
• wherein the region of the housing that is charged with gaseous fluid at the intermediate pressure level comprises a passage port to the suction pressure chamber and within the passage port a second expansion element is disposed for relieving the control mass flow from the intermediate pressure level to a low pressure level;
• and
• wherein the first expansion element and the second expansion element are configured to relieve their respective pressures simultaneously.