A system and method are presented for improved performance of gerotor compressors and expanders. Certain aspects of the disclosure reduce porting losses in a gerotor system. Other aspects of the disclosure provide for reduced deflection in lobes of an outer rotor of a gerotor system. Still other aspects of the disclosure provide for reduced leakage through tight gaps between components of a gerotor system.

A supercharged internal combustion engine has a supercharger operable to selectively supply a mass of air from below through above atmospheric air pressure according to the operating requirements of the engine. The supercharger has a shuttle combined with a throttle valve that controls the mass of air directed to an air mass bypass opening and supplied to the internal combustion engine. The shuttle has rollers that ride on rails that allow the shuttle to move to open and close the air mass bypass opening in communication with a casing that directs a mass of atmospheric air and a bypass mass of air interfused with the mass of atmospheric air to an air mass inlet of the supercharger.

A parallel connected multiple shaft roots vacuum pump includes an electric motor (30); a pump body which has N (N is an integers and is greater or equal to 2) parallel pump chambers (11); a bladed rotor set (4) installed within the pump body and including an active bladed rotor (3), and 2N1 driven bladed rotors (41, 42, 43); wherein the active bladed rotor includes an active driving gear (8); each driven bladed rotor includes a respective driven gear (401, 402, 403) which are installed at two sides of the active driving gear; a bridge gear set (9) is installed between the active driving gear (8) and two driven gears (402, 403) at a right side of the active driving gear,

A rotary piston compressor/pump/blower includes a housing spatially limiting a working chamber, an intake connection for guiding fluid into the working chamber, a pressure connection for guiding the fluid out of the working chamber, and a rotor assembly having a first rotor rotatably arranged in a first working sub-chamber and a second rotor cooperating with the first rotor and rotatably arranged in a second working sub-chamber. The rotary piston compressor/pump/blower also includes a ventilation channel, formed in the housing and connected to the working chamber via a ventilation channel opening, for the temporally limited introducing of air into the working chamber, wherein the ventilation channel opening is open at least in sections, in particular completely open, in a compression phase.

A parallel connected multiple shaft roots vacuum pump includes an electric motor (30); a pump body which has N (N is an integers and is greater or equal to 2) parallel pump chambers (11); a bladed rotor set (4) installed within the pump body and including an active bladed rotor (3), and 2N-1 driven bladed rotors (41, 42, 43); wherein the active bladed rotor includes an active driving gear (8); each driven bladed rotor includes a respective driven gear (401, 402, 403) which are installed at two sides of the active driving gear; a bridge gear set (9) is installed between the active driving gear (8) and two driven gears (402, 403) at a right side of the active driving gear.

A single-entry screw pump with a housing which has an inlet and an outlet for a medium to be pumped, with two spindles which are rotatably mounted in the housing in slide bearings, the spindles each have a screw thread on their outer circumference between the slide bearings, the screw threads of the spindles engage with one another and convey the medium from the inlet to the outlet, the housing has a sleeve section in which the screw threads of the spindles are positioned, the sleeve section has a suction-side inlet opening and a pressure-side outlet opening, wherein the media flow from the inlet to the inlet opening is guided along the pressure-side slide bearing in a hydraulically equalising manner and from the outlet opening to the outlet along the suction-side slide bearing.

A rotary piston compressor/pump/blower includes a housing spatially limiting a working chamber, an intake connection for guiding fluid into the working chamber, a pressure connection for guiding the fluid out of the working chamber, and a rotor assembly having a first rotor rotatably arranged in a first working sub-chamber and a second rotor cooperating with the first rotor and rotatably arranged in a second working sub-chamber. The rotary piston compressor/pump/blower also includes a ventilation channel, formed in the housing and connected to the working chamber via a ventilation channel opening, for the temporally limited introducing of air into the working chamber, wherein the ventilation channel opening is open at least in sections, in particular completely open, in a compression phase.