The invention relates to the energy sector. A device for converting the energy of a drop in the pressure of a gaseous working fluid comprises a housing, a consumer of the mechanical energy generated, and an expansion turbine with a bladed impeller. A turbine housing includes nozzle passages and return guide passages, gas ducts, connecting pipes for the supply and removal of a heat transfer medium, and connecting pipes for the supply and removal of a working fluid. The return guide passages are situated around the circumference of the impeller with an angular offset along the direction of rotation of the impeller and are interconnected by the gas ducts, forming successive expansion stages. The gas ducts are in the form of bent pipes and are disposed inside the housing of the device, forming a heat exchanger. The repeated expansion of the working fluid is carried out successively on a single impeller with an outlet flow rate from the nozzle channels of each stage within a Mach number range of 0.3-0.5 and with an optimal blade speed to available heat drop ratio of 0.5 in each expansion stage, with different degrees of pressure drop at each expansion stage. The technical result is more efficient energy conversion.

The invention relates to the energy sector. A device for converting the energy of a drop in the pressure of a gaseous working fluid comprises a housing, a consumer of the mechanical energy generated, and an expansion turbine with a bladed impeller. A turbine housing includes nozzle passages and return guide passages, gas ducts, connecting pipes for the supply and removal of a heat transfer medium, and connecting pipes for the supply and removal of a working fluid. The return guide passages are situated around the circumference of the impeller with an angular offset along the direction of rotation of the impeller and are interconnected by the gas ducts, forming successive expansion stages. The gas ducts are in the form of bent pipes and are disposed inside the housing of the device, forming a heat exchanger. The repeated expansion of the working fluid is carried out successively on a single impeller with an outlet flow rate from the nozzle channels of each stage within a Mach number range of 0.3-0.5 and with an optimal blade speed to available heat drop ratio of 0.5 in each expansion stage, with different degrees of pressure drop at each expansion stage. The technical result is more efficient energy conversion.

The present invention relates to a lightning current transfer system (100) adapted for usage in a wind turbine (W) having a hub (20) that is rotatably supported relative to a generator in a nacelle (30) and a plurality of blades (10) that are pivotably connected with the hub, wherein the hub (20) is covered by a spinner (20A). The lightning current transfer system (100) comprises a blade band (10A) mountable to the root of the blade (10); a lightning ring (80) mountable to the spinner (20A) facing the nacelle (30); a first contact device (70) mountable to the spinner (20A) adapted for providing lightning current transfer from the blade band (10A); a connecting device (75) for connecting the first contact device (70) with the lightning ring (80); and a second contact device (30B) mountable to the nacelle (30) and adapted for providing lightning current transfer from the lightning ring (80) to ground.

The invention relates to a turbine casing of an exhaust-gas turbocharger, having an inlet connection piece adjoined by a spiral, and having an outlet connection piece, characterized by an insulating device for reducing the input of heat into the inlet connection piece, the spiral and/or the outlet connection piece.

Various multi-stage radial turbine configurations that provide highly efficient momentum transfer between a fluid and the mechanical interface in both power producing and power consuming undertakings.

Various multi-stage radial turbine configurations that provide highly efficient momentum transfer between a fluid and the mechanical interface in both power producing and power consuming undertakings.

A power unit including an enclosed housing, a shaft passing through the central section of the enclosed, a motor located outside the housing and mounted to the first end of the shaft, a turbine located inside the housing and mounted into the shaft, the turbine includes a hub, a top end, a bottom end, and blades, sealing fins located at the bottom end of the turbine; and a pump located inside the housing and mounted on the turbine. The pump includes fins that are inserted in grooves located on the hub of the turbine. The fins of the pump are joined to the blades of the turbine creating that the pump, turbine, and shaft move as unitary unit. The fins of the pump maintained by two spaced crowns by insertion form cells that guide a flow of fluid. A space free of fluid with a defined volume occupies the bottom end of the pump. In a non-working position, the space free of fluid has a cylindrical shape. In a working position, because of rotation of the fluid, the space free of fluid has a paraboloid shape. The rotation of the fluid at a minimum angular velocity creates a virtual barrier, and generates a thrust.

A power unit including an enclosed housing, a shaft passing through the central section of the enclosed, a motor located outside the housing and mounted to the first end of the shaft, a turbine located inside the housing and mounted into the shaft, the turbine includes a hub, a top end, a bottom end, and blades, sealing fins located at the bottom end of the turbine; and a pump located inside the housing and mounted on the turbine. The pump includes fins that are inserted in grooves located on the hub of the turbine. The fins of the pump are joined to the blades of the turbine creating that the pump, turbine, and shaft move as unitary unit. The fins of the pump maintained by two spaced crowns by insertion form cells that guide a flow of fluid. A space free of fluid with a defined volume occupies the bottom end of the pump. In a non-working position, the space free of fluid has a cylindrical shape. In a working position, because of rotation of the fluid, the space free of fluid has a paraboloid shape. The rotation of the fluid at a minimum angular velocity creates a virtual barrier, and generates a thrust.

Turbomachines having guide ducts are disclosed. One disclosed example turbomachine includes a rotor rotatable about an axis of rotation and having rotor blade ducts, a housing having housing ducts to allow the inflow or outflow of working medium and guide blade ducts fixed in the housing, where the rotor blade ducts are in fluid communication with the housing ducts via the guide blade ducts.

Turbomachines having guide ducts are disclosed. One disclosed example turbomachine includes a rotor rotatable about an axis of rotation and having rotor blade ducts, a housing having housing ducts to allow the inflow or outflow of working medium and guide blade ducts fixed in the housing, where the rotor blade ducts are in fluid communication with the housing ducts via the guide blade ducts.