A multistage radial turbocompressor has at least first, second, and third intake parts each forming a respective intake spaced along an axis and first, second, and third output parts each forming a respective output axially juxtaposed with the respective intakes. Respective first, second, and third
A multistage radial turbocompressor has at least first, second, and third intake parts each forming a respective intake spaced along an axis and first, second, and third output parts each forming a respective output axially juxtaposed with the respective intakes. Respective first, second, and third fans having axially directed vanes are rotatable in the housing formed by the parts between the intakes and outputs. A shaft centered on the axis carries the first, second, and third fans. One of the fans is back-to-back with another of the fans with the vanes of the one fan facing axially oppositely away from the vanes of the other of the fans. Radial bearings support the shaft in the housing, and an axial bearing between the one fan and the other fan supports the shaft in the housing.
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1. A multistage radial turbocompressor comprising: first, second, and third fans spaced along an axis, having respective axially directed vanes, and rotatable about the axis;an intermediate shaft part centered on and rotatable about the axis and forming with the first, second, and third fans a rotor
1. A multistage radial turbocompressor comprising: first, second, and third fans spaced along an axis, having respective axially directed vanes, and rotatable about the axis;an intermediate shaft part centered on and rotatable about the axis and forming with the first, second, and third fans a rotor rotatable about the axis, the intermediate shaft part being fixed rotationally between the second and third fans, the second fan being back-to-back with the third fan with the vanes of the second fan facing axially oppositely away from the vanes of the third fan and outputs of the second fan and the third fan being axially juxtaposed with no intake part between them;first, second, and third separate intake parts juxtaposed with the respective fans and forming respective first, second, and third intakes spaced along the axis;respective first, second, and third separate output parts axially juxtaposed and connected with the respective intake parts and forming respective first, second, and third spiral outputs spaced along the axis, the intake and output parts each being undivided and independent, the first output part being connected to the second intake part;a connector part connected between the second and third output parts, the intake and output parts and connector part together forming an axially extending housing surrounding the rotor;a first cooler connected between the first output part and the second intake part;a second cooler connected between the second output part and the third intake part;a plurality of radial bearings supporting the shaft in the housing;an axial bearing and one of the radial bearings on the intermediate shaft between the back-to-back second and third fans, between the intermediate shaft part and the connector part, and supporting the intermediate shaft part in the housing; anda drive connected to an end of the rotor to rotate the rotor about the axis. 2. The multistage turbocompressor defined in claim 1, further comprising: another intermediate shaft part between the first and second fans and between the second and third fan, the radial bearings being on the shaft parts. 3. The multistage turbocompressor defined in claim 2 wherein the axial bearing is between the radial bearings. 4. The multistage turbocompressor defined in claim 1 wherein one of the radial bearings is between the second fan and the third fan. 5. The multistage turbocompressor defined in claim 1 wherein the radial bearings are axially inward of the first and third fans. 6. The multistage turbocompressor defined in claim 1 wherein the bearings are magnetic bearings. 7. The multistage turbocompressor defined in claim 1 wherein each intake part is are fitted to the respective output part at complementary faces inhibiting relative radial and axial movement. 8. The multistage turbocompressor defined in claim 7 wherein the faces of each part include at least one planar and annular face that is directed axially and at least one cylindrical surface that is centered on the axis and directed radially. 9. The multistage turbocompressor defined in claim 8 wherein at least some of the planar faces extend from the respective cylindrical surfaces. 10. The multistage turbocompressor defined in claim 1 wherein each of the fans is an axial-input radial-output fan. 11. A multistage radial turbocompressor comprising: at least three fans spaced along an axis, having respective axially directed vanes, and rotatable about the axis;an intermediate shaft part centered on and rotatable about the axis and forming with the fans a rotor rotatable about the axis, the intermediate shaft part being fixed rotationally between the two of the fans, the two fans being back-to-back with the vanes of the two fans facing axially oppositely away one another and outputs of the two fans being axially juxtaposed with no intake part between them;at least three separate intake parts juxtaposed with the respective fans and forming respective intakes spaced along the axis;at least three respective separate output parts axially juxtaposed and connected with the respective intake parts and forming respective spiral outputs spaced along the axis, the intake and output parts each being undivided and independent, one of the output parts being connected to the adjacent intake part;a connector part connected between the output parts of the two fans, the intake and output parts and connector part together forming an axially extending housing surrounding the rotor;a first cooler connected between the one of the output part and one of the intake parts;a second cooler connected between the another of the output parts and the another of the intake parts;a plurality of radial bearings supporting the shaft in the housing;an axial bearing and one of the radial bearings on the intermediate shaft between the two back-to-back fans, between the intermediate shaft part and the connector part, and supporting the intermediate shaft part in the housing.
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