Abstract: A method for machining ribs or grooves on a workpiece such as a shaft or an air or gas axial bearing intended to be rotated about a longitudinal axis of a centrifugal compressor. All of the ribs or grooves are obtained at once by the machining tool on a workpiece portion driven such that it rotates, by moving the workpiece or the tool holder in a longitudinal machining direction, the machining tool moving back and forth with a machining position in contact with the workpiece and a position wherein it is not in contact with the workpiece from the start to the end of the workpiece portion. The back-and-forth movements of the machining tool are synchronised with the sinusoidal program set up in the machining unit, as well as with the desired, programmed arrangement of the ribs or grooves to be produced on the workpiece portion.

Abstract: A method for machining ribs or grooves on a workpiece including a shaft (7) and an air or gas axial bearing (24) attached to the shaft or forming a part of the shaft. The workpiece is rotated about a longitudinal axis of a centrifugal compressor. All of the ribs or grooves are obtained at once by the machining tool on a workpiece portion driven such that it rotates, by moving the workpiece or the tool holder in a longitudinal direction, the machining tool moving back and forth with a machining position in contact with the workpiece and a position wherein it is not in contact with the workpiece from the beginning to the end of the workpiece portion. Reciprocating motions of the machining tool are synchronised with the sinusoidal program, as well as with the desired, programmed arrangement of the ribs or grooves to be produced on the workpiece portion.

Abstract: A method for machining ribs or grooves on a shaft (7) with an axial bearing (24) forming part of the shaft. The ribs or grooves (32, 24a) are obtained on a workpiece portion of the shaft and of the axial bearing, by moving the shaft or at least one tool holder fitted with a machining tool in a longitudinal direction of machining, by the tool performing reciprocating motions with a position in contact and with a position not in contact with the shaft or the axial bearing from the beginning to the end of the workpiece portion or face. The reciprocating motions are synchronised with the sinusoidal programming carried out in the machining unit, along with the desired and programmed arrangement of the ribs or grooves to be produced.

Abstract: A fuel cell including a two-stage, fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, first and second compression wheels mounted back-to-back on the shaft and forming respectively first and second compression stages, and a motor positioned between the first and second compression wheels and arranged to rotate the shaft. The case includes a through inner housing extending coaxially to the longitudinal axis and inside which is arranged at least the motor, the inner housing having an internal wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels extending between the first and second compression stages, allowing the motor to be cooled.

Abstract: A method for machining ribs or grooves on a workpiece such as a shaft or an air or gas axial bearing intended to be rotated about a longitudinal axis of a centrifugal compressor. All of the ribs or grooves are obtained at once by the machining tool on a workpiece portion driven such that it rotates, by moving the workpiece or the tool holder in a longitudinal machining direction, the machining tool moving back and forth with a machining position in contact with the workpiece and a position wherein it is not in contact with the workpiece from the start to the end of the workpiece portion. The back-and-forth movements of the machining tool are synchronised with the sinusoidal program set up in the machining unit, as well as with the desired, programmed arrangement of the ribs or grooves to be produced on the workpiece portion.

Abstract: A device for recovering and regulating thermal energy of an electric vehicle with an electrochemical generator wherein a fluid circulates, includes an air-conditioning circuit, a first heating or thermal energy recovery circuit for heating and a second cooling or thermal energy recovery circuit for cooling the electrochemical generator, an electric motor, an electronic circuit, and a braking circuit. A plurality of valves are arranged to put the air- conditioning circuit in communication with the first heating circuit or second cooling circuit, and means for controlling said valves arranged to allow, according to a temperature of the electrochemical generator, of the electric motor, of the electronic circuit and of the braking circuit, the circulation of the fluid from the air-conditioning circuit in the first heating circuit for a heating operation as well as the circulation of the fluid from the air-conditioning circuit in the second cooling circuit for a cooling operation.

Abstract: A heat pump including a two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes an inner through housing extending coaxially to the longitudinal axis and inside which is arranged at least the motor, the inner housing having an inner wall arranged to form, with the motor, channels between at least the inner wall and the motor to cool the motor.

Abstract: A two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes an inner through housing inside which is arranged at least the motor, the inner housing having an inner wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels extending to cool the motor in contact with the fluid flowing in the channels.

Abstract: A heating, ventilation and air conditioning system including a two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes a through inner housing inside which is arranged at least the motor, the inner housing having an internal wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels allowing the motor to be cooled on contact with fluid.

Abstract: A machine including: a main frame including at least one functional element and one control unit; an air compressor or water pump integrated in the main frame, including a frame in which are mounted a stator, a rotor interacting with the stator and including a shaft, at least one turbine carried by the shaft, a fluid-supply channel to the turbine, and an outlet channel for compressed fluid, the shaft being mounted rotatably on the frame about an axis by first and second bearings, including respectively first and second spherical elements provided on respective first and second ends of the shaft and centered relative to the axis of the shaft, and respective first and second housings provided in the frame centered relative to the axis of the shaft and to support the respective first and second spherical elements.

Abstract: An air compressor or water pump including a frame in which there are mounted a stator, a rotor interacting with the stator to form a synchronous motor, and including a shaft, at least one turbine carried by the shaft, a fluid-supply channel to the turbine, and an outlet channel for compressed fluid, the shaft of the rotor being mounted rotatably on the frame about an, axis by a first and a second bearing. The first, respectively the second, bearing includes a first, respectively a second, spherical element provided on a first, respectively a second, end of the shaft and disposed centered relative to the axis of the shaft, and a first, respectively a second, housing provided in the frame having a form of a cap disposed centered relative to the axis of the shaft and provided to support the first, respectively the second, spherical element.

Abstract: A two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes an inner through housing inside which is arranged at least the motor, the inner housing having an inner wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels extending to cool the motor in contact with the fluid flowing in the channels.

Abstract: A heating, ventilation and air conditioning system including a two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes a through inner housing inside which is arranged at least the motor, the inner housing having an internal wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels allowing the motor to be cooled on contact with fluid.

Abstract: A fuel cell including a two-stage, fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, first and second compression wheels mounted back-to-back on the shaft and forming respectively first and second compression stages, and a motor positioned between the first and second compression wheels and arranged to rotate the shaft. The case includes a through inner housing extending coaxially to the longitudinal axis and inside which is arranged at least the motor, the inner housing having an internal wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels extending between the first and second compression stages, allowing the motor to be cooled.

Abstract: A heat pump including a two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes an inner through housing extending coaxially to the longitudinal axis and inside which is arranged at least the motor, the inner housing having an inner wall arranged to form, with the motor, channels between at least the inner wall and the motor to cool the motor.

Abstract: An air compressor or water pump including a frame in which there are mounted a stator, a rotor interacting with the stator to form a synchronous motor, and including a shaft, at least one turbine carried by the shaft, a fluid-supply channel to the turbine, and an outlet channel for compressed fluid, the shaft of the rotor being mounted rotatably on the frame about an, axis by a first and a second bearing. The first, respectively the second, bearing includes a first, respectively a second, spherical element provided on a first, respectively a second, end of the shaft and disposed centered relative to the axis of the shaft, and a first, respectively a second, housing provided in the frame having a form of a cap disposed centered relative to the axis of the shaft and provided to support the first, respectively the second, spherical element.

Abstract: A machine including: a main frame including at least one functional element and one control unit; an air compressor or water pump integrated in the main frame, including a frame in which are mounted a stator, a rotor interacting with the stator and including a shaft, at least one turbine carried by the shaft, a fluid-supply channel to the turbine, and an outlet channel for compressed fluid, the shaft being mounted rotatably on the frame about an axis by first and second bearings, including respectively first and second spherical elements provided on respective first and second ends of the shaft and centered relative to the axis of the shaft, and respective first and second housings provided in the frame centered relative to the axis of the shaft and to support the respective first and second spherical elements.

Abstract: The invention relates to an electrochemical device intended for the production of products through electrochemical reaction of reactants, said electrochemical device comprising a stack of electrochemical cells (10), each cell (10) comprising a structure (16), two bipolar plates (18a, 18b) shared with adjacent cells (10), a membrane/electrode assembly (20) and two intermediate elements (21, 22) arranged to carry a current and the reactants/products to/from the membrane/electrode assembly (20).

Abstract: The invention relates to an electrochemical device intended for the production of products through electrochemical reaction of reactants, said electrochemical device comprising a stack of electrochemical cells (10), each cell (10) comprising a structure (16), two bipolar plates (18a, 18b) shared with adjacent cells (10), a membrane/electrode assembly (20) and two intermediate elements (21, 22) arranged to carry a current and the reactants/products to/from the membrane/electrode assembly (20).

Abstract: A ground contact system for a vehicle. The ground contact system comprises a wheel, a hub carrier, means for driving the wheel using at least one rotary motor secured to the hub carrier, reduction means comprising at least one gearwheel connected to the wheel and at least one pinion connected to the rotary motor, a sliding-bar suspension suspending the wheel from a support connected to the vehicle, and braking means. The braking means comprises a brake disc connected by its periphery to the wheel, and a brake calliper positioned inside the brake disc.