Fuel cell comprising a fluid compressor

A two-stage, fluid compressor comprising:

• 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,
• wherein the case includes a through inner housing extending coaxially to the longitudinal axis and inside which is arranged at least the motor, the through inner housing having an inner wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels (i) extending between the first compression stage and the second compression stage, (ii) spaced apart from each other, and (iii) coaxially surrounding the shaft, allowing the motor to be cooled on contact with fluid to be compressed flowing in the channels,
• wherein the case includes at a surface of the case at least one cavity forming at least one integrated housing arranged to receive at least one electronic component of the fluid compressor, the at least one integrated housing extending towards the inner wall to allow the at least one electronic component of the fluid compressor to be cooled by the fluid to be compressed flowing in the channels with the inner wall, the at least one electronic component of the fluid compressor including one or more capacitors,
• wherein the fluid compressor further includes a front radial bearing bracket and a back radial bearing bracket, arranged to be positioned around the shaft,
• wherein the shaft is rotatably mounted on the case with a front radial bearing and a back radial bearing respectively in contact with an inner circumferential surface of the front radial bearing bracket and an inner circumferential surface of the back radial bearing bracket,
• wherein the inner circumferential surface of the front radial bearing bracket has a pair of first slots each configured to receive an O-ring joint and the inner circumferential surface of the back radial bearing bracket has a pair of second slots each configured to receive an O-ring joint, and
• wherein there is provided a first orifice arranged in the inner circumferential surface of the front radial bearing bracket between the pair of first slots and a second orifice in the inner circumferential surface of the back radial bearing bracket between the pair of second slots to allow the fluid to be compressed flowing in the channels to flow in proximity respectively to the front radial bearing and the back radial bearing, and a third orifice is configured to allow fluid to be compressed to rejoin the channels after cooling the front radial bearing and back radial bearing.