An oil feed type air compressor includes a compressor main body, a separator that separates the oil from the compressed air delivered from the compressor main body, and an oil feed system that supplies the oil to the working chambers and bearings of the compressor main body. The oil feed system includes an oil cooler that includes a cooling unit and a cooling unit connected on a downstream side of the cooling unit, an oil feed pipe that is connected to an outlet between the cooling unit and the cooling unit and that supplies the oil cooled by the cooling unit to the bearings of the compressor main body, and an oil feed pipe that is connected to an outlet on a downstream side of the cooling unit and that supplies the oil cooled by the cooling units to the working chambers of the compressor main body.

A compressor system can include a lubricant injection system useful to supply lubricant to an airend. The compressor system can include a variable lubricant flow valve which can be regulated by a controller on the basis of operating conditions of the compressor system. In one form the compressor system also includes an oil separator and/or an oil cooler with or without a them al control valve. The controller can have one or more modes of operation, including a mode in which the controller regulates the flow of lubricant to the airend to increase an internal flow area of the valve when the airend is operated at an unloaded or loaded condition. In some forms the controller can regulate the lubricant flow valve and/or the thermal control valve and/or the lubricant cooler.

A gas compressor includes a compression mechanism, a separator tank that introduces lubricating oil to be supplied to the compression mechanism and a mixed fluid of a working fluid and the lubricating oil discharged from the compression mechanism and separates the lubricating oil, an oil cooler that cools the lubricating oil from the separator tank, an oil circulation path that supplies the cooled lubricating oil to the compression mechanism, and a motor that drives the compression mechanism and is isolated from the oil circulation path. Further, the gas compressor includes a suction temperature sensor that detects a suction temperature of the working fluid, a discharge pressure sensor that detects a discharge pressure of the compressed working fluid, a rotation speed sensor that detects a rotation speed of the motor, and a lubricating oil state estimation unit that estimates a temperature of the lubricating oil based on the detected suction temperature, discharge pressure, and rotation speed of the motor, in which the lubricating oil state estimation unit estimates a deterioration state of the lubricating oil based on the estimated temperature of the lubricating oil.

A compressor system can include a lubricant injection system useful to supply lubricant to an airend. The compressor system can include a variable lubricant flow valve which can be regulated by a controller on the basis of operating conditions of the compressor system. In one form the compressor system also includes an oil separator and/or an oil cooler with or without a them al control valve. The controller can have one or more modes of operation, including a mode in which the controller regulates the flow of lubricant to the airend to increase an internal flow area of the valve when the airend is operated at an unloaded or loaded condition. In some forms the controller can regulate the lubricant flow valve and/or the thermal control valve and/or the lubricant cooler.

A compressor system (10) and an intake pipe (300) used for the compressor system (10), wherein the intake pipe (300) comprises: a lubricant separator (310), which is configured to separate a lubricant which is in a compression fluid flowing through the intake pipe (300); and a first lubricant supply pipe (340), which is configured to supply the separated lubricant to a first compressor (100) or a second compressor (200) in the compressor system (10).

The present disclosure provides a compressor with an oil equalizing pipe, a parallel compressor set, and an oil equalizing method. The compressor includes at least one oil equalizing pipe, an opening at one end of the oil equalizing pipe is formed in a target oil level of an oil sump, and the opening at the other end of the oil equalizing pipe is formed in a suction port; and when the oil level of the oil sump of the compressor is higher than the target oil level, the extra oil enters the suction port through the oil equalizing pipe. Compared with the prior art, the present disclosure has the advantages that, when the compressor is running, the gas in the suction port flows, so that the pressure at the suction port is less than the pressure on the surface of the oil sump; when the oil level of the oil sump of the compressor is higher than the target oil level, the extra oil enters the suction port through the oil equalizing pipe under the action of the above pressure difference, a part of the oil enters vortex and is discharged from the compressor via the exhaust port, and the oil discharged from the compressor returns to the other compressor lack of oil through a pipeline, thereby achieving oil balance between different compressors.

A compressor system can include a lubricant injection system useful to supply lubricant to an airend. The compressor system can include a variable lubricant flow valve which can be regulated by a controller on the basis of operating conditions of the compressor system. In one form the compressor system also includes an oil separator and/or an oil cooler with or without a thermal control valve. The controller can have one or more modes of operation, including a mode in which the controller regulates the flow of lubricant to the airend to increase an internal flow area of the valve when the airend is operated at an unloaded or loaded condition. In some forms the controller can regulate the lubricant flow valve and/or the thermal control valve and/or the lubricant cooler.

A liquid-injected compressor or vacuum pump device with a liquid-injected compressor or vacuum pump element (2),which includes a liquid return system (7), a motor (4) to drive the compressor or vacuum pumping element (2), a gearbox (3) provided between the motor (4) and the liquid-injected compressor or vacuum pump element (2), and a liquid separator vessel (5) in fluid connection with an outlet (6) of the compressor or vacuum pump element (2). The liquid return system (7) includes a main body (8) with a chamber in which a first compressed gas flow (11) from the liquid separator vessel (5) and a second fluid flow (15) from the gearbox (3) are mixed together to form a third fluid flow (20). The third fluid flow (20) leaves the chamber via an outlet (16) and is directed into the liquid-injected compressor or vacuum pump element (2) via the injection point (17).

A compressor (100) and a vehicle are disclosed. The compressor (100) includes: a housing (1); a separating component (2) dividing an interior of the housing (1) into a low-pressure chamber (13) and a high-pressure chamber (14); a cylinder component (3); a crankshaft (4); a plurality of oil transmission grooves (5); and at least one oil transition groove (6). During the rotation of the crankshaft (4), each oil transition groove (6) is intermittently in communication with oil transmission grooves (5) adjacent thereto. The oil transition groove (6) is alternately in communication with two oil transmission grooves (5) located at two circumferential sides of the oil transition groove (6). An oil-way passage (31) of the cylinder component (3) is in communication with one of oil transmission grooves (5), and another one of oil transmission grooves (5) or the oil transition groove (6) is in communication with the low-pressure chamber (13).

A refrigeration apparatus (1) includes a main refrigerant circuit (2) including a positive displacement compressor (4), a condenser (6), an expansion valve (8), and an evaporator (10), through which a refrigerant circulates successively in a closed loop circulation, a lubrication refrigerant line (18) connected to the main refrigerant circuit (2) between the condenser (6) and the expansion valve (8) or to the condenser (6), in which circulates a portion of the refrigerant of the main refrigerant circuit (2) and connected to the compressor (4) for lubrication of the compressor (4) with the refrigerant. The lubrication refrigerant line (18) includes, upstream from the compressor (4): a throttle valve (20) adapted to vary the lubrication refrigerant flow entering the compressor (4), a downstream pressure detector (30) configured to measure refrigerant pressure (P3) downstream the throttle valve (20) and upstream the compressor (4).