TURBOMACHINE AND APPARATUS COMPRISING SAID TURBOMACHINE

Abstract

A turbomachine, includes a case and a rotor positioned in the case so that it can rotate with respect to the case around its own longitudinal axis. The rotor includes: one blading located on the rotor and disposed in a respective transit volume bounded between the rotor and the case for the passage of a first working fluid; one helical conduit developing in loops around the longitudinal axis and extending between one inlet and one outlet for the passage of a second working fluid. The helical conduit is radially internal with respect to the blading has loops with gradually increasing or decreasing radial dimensions from the inlet towards the outlet.

Claims

1. Turbomachine, comprising: a case; a rotor positioned in the case so that it can rotate with respect to the case around its own longitudinal axis; wherein the rotor comprises: at least one blading mounted on the rotor and arranged in a respective transit volume bounded between the rotor and the case for the passage of a first working fluid; at least one helical conduit developing in loops around the longitudinal axis and extending between at least one inlet and at least one outlet for the passage of a second working fluid; wherein the at least one helical conduit is radially internal with respect to the at least one blading and has loops with gradually increasing or decreasing radial dimensions from the inlet towards the o outlet.

2. Turbomachine according to claim 1, wherein the at least one blading is disposed on a radially outer surface of the rotor and the at least one helical conduit is radially inner relative to the radially outer surface.

3. Turbomachine according to claim 1, wherein the rotor is a solid body and the at least one helical conduit is fashioned in the solid body.

4. Turbomachine according to claim 2, wherein the at least one inlet is located on the radially outer surface of the rotor and the at least one outlet is located on a head surface of the rotor.

5. Turbomachine according to claim 2, wherein the at least one inlet is located near a first end of the rotor and the at least one outlet is located near a second end of the rotor opposite the first end.

6. Turbomachine according to claim 1, wherein the at least one blading comprises a plurality of vanes or defines at least one profile of a screw.

7. Turbomachine according to claim 1, wherein the at least one blading located in the transit volume defines a or is part of a compressor or of a pump or wherein the blading in the transit volume defines a or is part of an expander; wherein the at least one helical conduit is a bladeless expander or wherein the at least one helical conduit is a bladeless compressor or a pump.

8. Turbomachine according to claim 1, wherein the at least one blading located in the transit volume and the at least one helical conduit are part of a same circuit and the first working fluid and the second working fluid are the same working fluid.

9. Turbomachine according to claim 1, wherein the case has a distributor placed around the rotor and in fluid communication with the inlet of the at least one helical conduit, optionally wherein the distributor comprises a plurality of orientable directional blades.

10. Turbomachine according to claim 9, wherein the rotor comprises inlet series of the helical conduits, wherein each series comprises a plurality of inlets disposed circumferentially around the rotor, wherein the series are positioned in different axial positions; wherein the distributor placed around the rotor is configured for inserting the second working fluid through one or more of the inlet series depending on the load.

11. Turbomachine according to claim 1, wherein the rotor comprises a first part carrying the blading and a second part defined by a shaft or comprising a shaft; wherein the first part and the second part are separated elements and connected to each other; wherein the at least one helical conduit is fashioned in the first part or in the second part or both in the first part and in the second part.

12. Turbomachine according to claim 1, wherein the rotor has at least an empty portion to lighten the rotor.

13. Turbomachine according to claim 1, wherein the at least one inlet and/or the at least one outlet is/are disposed/the between vanes of the blading so as to modify a boundary layer of the first working fluid.

14. Turbomachine according to claim 1, wherein the turbomachine is a turbopump.

15. Turbomachine according to claim 1, wherein the turbomachine is a turbocharger.

16. Refrigeration apparatus comprising: at least one condenser; at least one evaporator; at least one turbomachine according to claim 15; an electric motor connected to the rotor of the turbomachine; ducts connecting the at least one condenser, the at least one evaporator and the at least one turbomachine to form a refrigeration circuit; wherein the ducts connect the at least one condenser and the at least one evaporator to the at least one turbomachine so as to compress a working fluid circulating in the refrigeration circuit before it enters the at least one condenser and to expand the working fluid before it enters the at least one evaporator.

Description

BRIEF DESCRIPTION OF FIGURES

[0109] Other characteristics and advantages will be clearer from the detailed description of the preferred but non-exclusive embodiments, of a turbomachine according to the present invention and of an apparatus comprising said turbomachine.

[0110] This description will be hereinafter indicated with reference to the attached drawings, given only as indicative purpose and, therefore, non-limiting, wherein:

[0111] FIG. 1 is a sectional view of a turbomachine according to the present invention;

[0112] FIG. 2 is a tridimensional view of the turbomachine of FIG. 1;

[0113] FIG. 3 is an exploded view of the turbomachine thereof in FIGS. 1 and 2 in an assembling step;

[0114] FIG. 4 is a rear view of the rotor of the turbomachine of the preceding figures;

[0115] FIG. 5 shows schematically a refrigeration apparatus according to the invention;

[0116] FIG. 6 shows a refrigeration cycle carried out by the apparatus of FIG. 5 compared with a traditional refrigeration cycle;

[0117] FIG. 7 is a sectional view of a variant of the turbomachine according to the invention;

[0118] FIG. 8 is a sectional view of another variant of the turbomachine according to the invention;

[0119] FIG. 9 is a sectional view of another variant of the turbomachine according to the invention;

[0120] FIG. 10 is a sectional view of another variant of the turbomachine according to the invention;

[0121] FIGS. from 11 to 14 schematically show embodiments of rotors of the turbomachine according to the invention;

[0122] FIG. 15 is a schematic rear view of a rotor of the turbomachine according to the invention;

[0123] FIG. 16 shows another variant of the turbomachine of FIG. 1;

[0124] FIGS. from by 17 to 26 show other variants of the rotor implementable in a turbomachine according to the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

[0125] With reference to the attached figures, with 1 it has been overall indicated a turbomachine according to the present invention.

[0126] In the embodiment shown in figures from 1 to 3, this turbomachine 1 is a turbocharger which integrates a centrifugal compressor with axial/radial mixed flow and a turbine without vanes i.e. of bladeless type.

[0127] The turbomachine 1 comprises a case 2 which comprises a central portion 3 which delimits a housing for a rotor 4 and a sleeve 5 which extends overhanging from a side of the central portion 3. A tubular body 6 develops overhanging from a side of the central portion 3 opposite to the one connected to the sleeve 5.

[0128] The rotor 4 comprises a cylindrical base 7 with circular section with higher diameter which thins out in a distal portion 8 with circular section of lower diameter. A radially outer surface 9 of the rotor 4 diverts from the distal end 8 towards the cylindrical base 7 and brings a blading defined by a plurality of vanes 10 with heights that decrease from the distal end 8 towards the cylindrical base 7. The vanes 10 are curved and follow the profile of the radially outer surface 9.

[0129] A wall of the case 2 is positioned near the vanes 10 and delimits together with the radially outer surface 9 of the rotor 4 a transit volume 11 for the passage of a first working fluid. A section of said volume of passage decreases by moving from the distal end 8 towards the cylindrical base 7, i.e. starting from an inlet 12 of the transit volume 11 towards an outlet 13 of said transit volume.

[0130] The rotor 4 is a solid body and has furthermore a helical conduit 14 obtained inside it. The helical conduit 14 develops in loops around a longitudinal axis X-X of the rotor 4 or rotation axis of the rotor 4. The helical conduit 14 has a plurality of inlets 15 defined by respective holes fashioned on the radially outer surface of the rotor 4 near the cylindrical base and an outlet 16 fashioned on a head surface of the distal portion 8 of the rotor 4. For example but not necessarily, the outlet 16 is axial, i.e. parallel to the longitudinal axis X-X.

[0131] The helical conduit 14 develops in loops around to the longitudinal axis X-X and extends between the plurality of inlets 15 and the outlet 16 according to a plurality of loops which have gradually decreasing radial dimensions starting from the inlets 15 towards the outlet 16. The inlets 15 are for example all connected to the first loop of greater dimensions, as shown in FIG. 4.

[0132] The helical conduit 14 is radially internal with respect to the blading and to the radially outer surface 9 of the rotor 4 and is configured for allowing the passage of a second working fluid.

[0133] The helical conduit 14 uses also the friction force exchanged between an inner surface of said helical conduit 14 and the second working fluid to transfer power/force between said fluid and the rotor 4.

[0134] The turbomachine 1 comprises a shaft 17 integral with the rotor 4 and developing from the cylindrical base 7 coaxially to the longitudinal axis X-X. The shaft 17 is installed in the sleeve 5 of the case 2 through bearings 18 so that it can rotate around the longitudinal axis X-X. The bearings 18 support the shaft 17 and support overhanging the rotor 4 in the case 4, being disposed only on a side of the rotor 4 whereas the distal portion 8 is not supported by the case 4 but protrudes overhanging.

[0135] In embodiment variants, the rotor 4 can be connected to a motor and/or to an electric generator.

[0136] In these variants, the shaft 17 can also be the shaft of the motor/generator which passes through an opening in the case 2 and carries the rotor 4. In these variants, the shaft is then supported by bearings of the motor/generator instead of bearings 18 placed in the case 4.

[0137] The rotor 4 is a solid body and then the vanes 10 and the helical conduit 14 are integral to each other and, when the rotor 4 rotates, rotate together around the longitudinal axis X-X.

[0138] The central portion 3 of the case 2 delimits a diffuser 19 and a distributor 20 disposed around the cylindrical base 7. The diffuser 19 surrounds and is in fluid communication with the outlet 13 of the transit volume 11. The distributor 20 surrounds and is in fluid communication with the inlets 15 of the helical conduit 14. The diffuser 19 and the distributor 20 are fashioned in a loop 21 located around the cylindrical base 7 and are separated the one from the other by a septum 22. The septum 22 is connected to a radially peripheral wall of the loop 21 and has a radially internal edge thereof placed in proximity of the cylindrical base 7. The edge is provided with a gasket or a mechanical seal which prevents leakages between the diffuser 19 and the distributor 20. Optionally, in the diffuser 19 are placed fixed blades 23 and in the distributor 20 are placed directional blades 24. The directional blades 24 can be oriented as a function of the flow rate and the turbomachine 1 is so adapted to work with partial or variable loads.

[0139] Radial supports 25 disposed in the tubular body 6 carry an internal tubular body 26 positioned in front of the distal portion 8 and coaxial to the longitudinal axis X-X of the rotor 4 to receive the second working fluid exiting from the outlet 16 of the helical conduit 14 and allow its leakage from the case 2 through a first outlet 27 from said case 2.

[0140] A first inlet 28 in the case 2 is bounded between the tubular body 6 and the internal tubular body 26 and allows to the first working fluid to enter through the inlet 12 of the transit volume 11. The loop 21 has a respective second inlet 29 in the case 2 which inserts in the distributor 20 and a second outlet 30 for the leakage of the first working fluid from the diffuser 19. Then, the first working fluid axially enters in the case 2 through the first inlet 28, passes through the transit volume 11 with the vanes 10, flows in the diffuser 19 and then exits from the second outlet 30. The second working fluid enters along a direction substantially perpendicular to the longitudinal axis X-X in the second inlet 29 of the case 2, passes in the distributor 20, flows through the helical conduit 14, and exits axially through the first outlet 27.

[0141] As it will be more evident hereinafter, the vanes 10 in the transit volume define the axial/radial mixed flow centrifugal compressor and the helical conduit 14 defines the turbine bladeless.

[0142] In the example of embodiment of FIGS. 1-4, the case 2 is formed by a first body and a second body. The first body comprises the tubular body 6, the internal tubular body 26, the radial supports 25, the central portion 3 with the loop 21 and the septum 22. The second body comprises the sleeve 5 and a rear wall 31 from which protrudes the sleeve 5 and which closes the first body.

[0143] The turbomachine 1 can be mounted by inserting the shaft 17 with the bearings 18 in the sleeve 5 and then by axially approaching between them the first body to the second body with the rotor 4 and joining the rear wall 31 to the first body, as shown in FIG. 3.

[0144] In realization variants, not shown, the case 2 can be instead divided into two halves according to a plane which contains the longitudinal axis X-X.

[0145] FIG. 5 schematically shows a refrigeration apparatus 32 in which it is used the turbomachine 1 above described. In this FIG. 5, the turbomachine 1 is schematically represented. Said turbomachine 1 is a turbocharger. The blading in the transit volume 11 defines the compressor and the helical conduit 14 is the bladeless expander, i.e. the turbine.

[0146] The refrigeration apparatus 32 comprises the turbomachine 1, one evaporator 33, one condenser 34. The shaft 17 of the rotor 4 of the turbomachine 1 is connected to an electric motor 35. Conduits connect between them the turbocharger 1, the evaporator 33 and the condenser 34 and contain a working fluid, a cooling fluid, so as to form a refrigeration circuit and to define the refrigeration apparatus 32 configured for actuating a refrigeration cycle.

[0147] The first working fluid and the second working fluid indicated with different names in the detailed description of the turbomachine 1 of FIGS. 1-4 coincide, i.e. only one working fluid circulates in the refrigeration circuit of FIG. 5 and then through the axial/radial mixed flow centrifugal compressor and through the helical conduit 14 which defines the turbine bladeless.

[0148] In FIG. 5 the evaporator 33 has an inlet 36 and an outlet 37, the condenser 34 has an inlet 38 and an outlet 39.

[0149] The outlet 39 of the condenser 34 is connected to the second inlet 29 of the case 2 and then to the inlets 15 of the helical conduit 14 and the inlet 38 of the condenser 34 is connected to the second outlet 30 of the case 2 and then to the outlet 13 of the transit volume 11. The outlet 37 of the evaporator 33 is connected to the first inlet 28 of the case 2 and then to the inlet 12 of the transit volume 11 and the inlet 36 of the evaporator 33 is connected to the first outlet 27 of the case 2 and then to the outlet 16 of the helical conduit 14. The working fluid circulating in the refrigeration circuit is compressed in the compressor actuated by the electric motor 35 before entering in the condenser 34 and is expanded in the bladeless expander/turbine before it enters in the evaporator 33.

[0150] The attached FIG. 6 shows the refrigeration cycle actuated by the apparatus 32 according to the invention here described (continuous line) and a refrigeration cycle actuated by a traditional apparatus (dashed line), wherein instead of the turbocharger 1 of the present invention there is a compressor and a lamination/expansion valve, i.e. instead of in the turbine according to the invention, the working fluid is expanded through the lamination/expansion valve.

[0151] According to the traditional cycle, the working fluid is compressed in the compressor from A to B, then cools and condenses in the condenser from B to C, then expands in the lamination valve from C to D and evaporates in the evaporator from D to A.

[0152] According to the cycle operated by the apparatus 32 of the invention, the working fluid is compressed in the compressor from A to B, then cools and condenses in the condenser 34 from B to C, then expands in the bladeless turbine from C to D and evaporates in the evaporator 33 from D to A.

[0153] As it can be seen, the two cycles are substantially superimposed except in the zone/step of expansion C-D, C-D so the area enclosed by the refrigeration cycle operated by the apparatus 32 according to the invention is greater than the area enclosed by the traditional cycle, so it involves a specific work greater in absolute value. Furthermore, it comes closest to an ideal cycle.

[0154] The Applicant has observed which already in small domestic applications and with a turbine of performance higher than 60%, the invention allows to reduce the consumptions of about the 20-25%, further than increase the refrigeration power of a few percentage points (up to 15-20%). These benefits become more significant the greater are the performance of the turbine and the difference of temperature between the hot source and the cold source.

[0155] FIG. 7 is a sectional view of a variant of the turbomachine 1 according to the invention which differs from the turbomachine shown in FIGS. 1-4 because the rotor 4 is not supported overhanging. In fact, the shaft 17 comprises furthermore an end 40 which extends starting from the distal portion 8 of the rotor 4 and is supported in the case 2 by bearings 18 housed in a body 41 in its turn supported by radial supports 42 disposed in the tubular body 6. The helical conduit 14 extends also within said end 40 of the shaft 17 and ends on the ending side of said end 40 placed at the internal tubular body 26.

[0156] FIG. 8 is a sectional view of another variant of the turbomachine 1 according to the invention which differs from the turbomachine shown in FIGS. 1-4 because the compressor is of axial flow type, i.e. vanes 10 radially develop starting from the distal portion 8 of the rotor 4 with decreasing heights from the inlet 12 towards the outlet 13 of the transit volume 11.

[0157] Another variant, not shown, has the structure of the compressor of FIG. 8 and the end 36 of the shaft 17 supported by bearings 18 as in FIG. 7.

[0158] Also the variants of FIGS. 7 and 8 can comprise a case 2 divided as in FIG. 3 or divided according to a plane which contains the longitudinal axis X-X.

[0159] FIG. 9 is a sectional view of another variant of the turbomachine 1 according to the invention which differs from the turbomachine shown in FIGS. 1-4 for the arrangement of the second inlet 29 and of the second outlet 30 on the case 2. The second inlet 29 is arranged diametrically opposite with respect to the second outlet 30 and the flows of the inlet working fluid in inlet in the second inlet 29 and in outlet from the second outlet 30 are substantially radial with respect to the longitudinal axis X-X. In another variant, not shown, the second inlet 29 and the second outlet 30 are side by side so as the flows are always radial.

[0160] FIG. 10 is a sectional view of another variant of the turbomachine 1 according to the invention which differs from the turbomachine shown in FIGS. 1-4 for the presence of a passage 43 for atmospheric air fashioned between two distinct loops, one which delimits the diffuser 19 which surrounds and is in fluid communication with the outlet 13 of the transit volume 11 and the other which delimits the distributor 20 which surrounds and is in fluid communication with the inlets 15 of the helical conduit 14. The same passage 43 can also be obtained between the second inlet 29 and the second outlet 30 which are side by side so as the inlet and outlet flows are radial.

[0161] In other embodiments falling within the scope of the present invention the arrangement and the geometry of the blading in the transit volume 11 and also the number and the arrangement of the helical conduits 14 may differ from those described above.

[0162] For example, the blading in the transit volume defines an expander instead of a compressor and the helical channel defines a compressor or a pump instead of an expander. In this case, the diffuser is in fluid communication with the outlet of the helical conduit and the distributor is in fluid communication with the inlet in the transit volume.

[0163] For example, said blading is subdivided in different sections with different functions and each comprising one or more stages (see FIG. 11 which shows two turbines with vanes 10 and a bladeless compressor defined by the helical conduit 14). The case 2 can comprise a plurality of statoric vanes 44 the vanes 10 cooperating in the transit volume 11 (for example as in FIG. 11). Said blading can define at least one profile of a screw instead of comprising a plurality of different vanes.

[0164] If the helical channel is used as a compressor, then the loops have gradually increasing radial dimensions starting from the inlet or inlets 15 towards the outlet 16 or the outlets 16 (see FIG. 11).

[0165] The rotor 4 can also comprise a plurality of helical conduits 14 which extend into the same axial zones of the rotor 4, i.e. for example along the whole axial development of it as in FIG. 13 (which shows a compressor with vanes 10 and two bladeless turbines each defined by a respective helical conduit 14), or which extend in different axial zones of the rotor 4 (see FIG. 12 which shows two turbines with vanes 10 two bladeless turbines each defined by a respective helical conduit 14).

[0166] Each helical conduit 14 can have one inlet 15 or a plurality of inlets 15 and/or one outlet 16 or a plurality of outlets 16. The inlet 15 or the inlets 15 can be arranged at a first end of the rotor 4 or in an intermediate zone thereof, as for example in FIG. 12. Similarly, the outlet 16 or the outlets 16 can be arranged at a second end of the rotor 4 or in an intermediate zone thereof.

[0167] The outlet or the outlets 16 can be oriented parallel to the longitudinal axis X-X (axial outlets) or can have an angle of inclination with respect to said longitudinal axis X-X.

[0168] The rotor 4 can also be lightened by removing unnecessary material both externally and internally. For example, the portion of the rotor 4 radially located inside with respect to the loops of the helical conduit 14 (or of the helical conduits), i.e. where the loops are not present, can be lightened by removing material and obtaining one or more empty rooms. The rotor or at least a part thereof can furthermore have a honeycomb structure so as to lighten it and at the same time ensure an adequate rigidity thereof.

[0169] Regardless of the specific geometry adopted, the material with which the turbomachine 1 is realized is chosen according to the specific requirement. For example, the rotor 4 is realized in metal, for example steel, martensitic or austenitic stainless steel, alloys of nickel, aluminum, or also in plastic material, composite or organic materials.

[0170] If the rotor is in metal, it is preferable to realize it by casting, through mechanical machining, such as milling or electroerosion (EDM-Electrical Discharge Machining) or also 3D printing. If the rotor is in plastic material, it can for example be realized through 3D printing.

[0171] The rotor 4 can be realized in a solid body or in a plurality of sectors 45 then joined together, as schematically shown in FIG. 14. In each sector 45 is obtained a tract of the channel or of the helical channels 14. Each of the sectors 45 can be produced by casting, through mechanical machining, such as milling or electroerosion or 3D printing. If realized in metal, these sectors 45 are for example joined together through welding or diffusion bonding or through other mechanical connections.

[0172] Furthermore, the rotor 4 can be geometrically studied and realized to optimize the inlet or the inlets 15 and/or the outlet or the outlets 16. For example, as shown in FIG. 15, an outer surface of the rotor 4 forms, at least at the inlets 15, steps so that said inlets 15 are fashioned on surfaces of the rotor 4 which are not coaxial to the longitudinal axis X-X. The inlets 15 are not oriented along radial directions but form an angle other than zero with respect to radial directions passing by the respective inlet point. Furthermore, the section of passage of each helical channel 14 can take on different dimensions and shapes (for example circular, triangular, elongated, T-shaped, etc.) and be constant or vary along its development.

[0173] FIG. 16 shows another variant of the turbomachine of FIG. 1 which differs from the turbomachine of FIG. 1 because the case 2 comprises an auxiliary loop 46 arranged at the end of the tubular body 6. The first inlet 28 is obtained on said auxiliary loop 46 and the radial supports 25 are not present. In this way the case 2 is easier (there are no radial supports 25) and is completely prevented that the flow entering the compressor mixes with the fluid exiting from the turbine.

[0174] The turbomachine 1 according to the invention can furthermore be used in apparatuses different than the above-described refrigeration apparatus. For example, the turbomachine 1 can be used as turbocharger in a gas cycle (gas turbine or turbogas) or in a steam cycle (as turbopump).

[0175] For example in possible embodiments, the blading located in the transit volume 11 and the helical conduit 14 are part of separated circuits and the first working fluid and the second working fluid are different fluids which circulate in said separated circuits. The first working fluid can be used for rotating the turbine defined from the blading located in the transit volume 11 and thus actuating the compressor defined by the helical channel 14 and compressing the second working fluid. Depending on the specific application, the shaft of the turbomachine 1 according to the invention can be connected to an electric motor, as above shown, or to a generator or to a motogenerator.

[0176] The turbomachine 1 according to the invention can furthermore be used with fluids of different types, for example viscous fluids (i.e. with dynamic viscosity higher than 10.sup.1 Pa s), Newtonian or non-Newtonian fluids, in hydroelectricity, with gas or steam or liquids.

[0177] FIG. 17 shows another variant of the rotor 4 provided with three inlet series 15. The rotor has three circumferential surfaces with different diameters and axially side by side. Each series is positioned on one of the three circumferential surfaces. The inlets 15 of each series are connected to a respective helical conduit 14. The distributor 20, not shown in FIG. 17, is structured and configured for inserting the second working fluid through the inlets of one, two or of all the three series as a function of the flow rate. The turbomachine 1 is then adapted to work with variable loads.

[0178] FIGS. 18, 19 and 20 show variants wherein the rotor 4 is formed by a first part 47 carrying the blading and by a second part 48. The first part 47 and the second part 48 are separated elements and connected to each other, for example through screws and/or welds and/or Hirth teeth.

[0179] In FIG. 18, the second part 48 is the shaft 17 and the first part 47 is fitted on the second part 48. Furthermore, the helical conduit 14 is entirely fashioned in the first part 47 and around the shaft 17. The rotor 4 of FIG. 19 differs by the one of FIG. 18 because the helical conduit 14 is partly fashioned in the first part 47 and partly in the shaft 17. The inlets 15 are on the first part 47 and the outlet 16 is on the end of the shaft 17. In not shown embodiments, a single shaft 17 can carry multiple first parts 47 so as to realize a plurality of turbomachines 1. For example, the helical conduits 14 of the turbomachines 1 are connected to each other in series or in parallel and/or the transit volumes 11 of the turbomachines 1 are connected to each other in series or in parallel.

[0180] The second part 48 of the rotor 4 of FIG. 20 (turbopump) comprises a portion with greater diameter on which are disposed the outlets 16 and from which extends overhanging the shaft 17. The helical conduit 14 is entirely fashioned in the second part 48 and defines a pump. The inlet 15 is placed on the end of the shaft 17. The first part 47 carries the vanes 10 defining a turbine and has a central passage which houses the shaft 17 of the second part 48. The first part 47 is leaning against the portion with greater diameter and to it connected through a Hirth tooth 50 (toothed ring obtained on the first part 47 and toothed ring obtained on the portion with greater diameter). A plate 51 with toothed ring is furthermore screwed on the end of the shaft 17. The plate 51 engages with a toothed ring fashioned on the first part 47 (another Hirth tooth 50) and closes the first part between the portion with greater diameter and said plate 51.

[0181] In a variant embodiment, not shown, the outlets 16, instead of on the peripheral edge of the portion with greater diameter, are placed on a side of said portion with greater diameter opposite the side from which extends overhanging the shaft 17. The outlets 16 of the pump defined by the helical conduit 14 are axial but can also be axial/radial. In this way, it is possible to better separate the flow of the first working fluid from flows of the second working fluid if they are at very different temperatures.

[0182] In other variants, not shown, the first part 47 is as the one of FIG. 20, the second part 48 is similar to the one of FIG. 20 but does not comprise the shaft 17 and in its turn the second part 48 is fitted on a shaft.

[0183] FIGS. 21 and 22 show examples of lightened rotors 4, i.e. wherein are fashioned empty portions 49. The rotor 4 of FIG. 21 is similar to the one of FIGS. 1 and 3 but it has furthermore been fashioned a recess 49 in the portion not occupied by the helical conduit 14.

[0184] The rotor 4 of FIG. 22 is double (the helical conduit 14 is present but is not shown), as the ones of FIGS. 11 and 12, and each blading is as the one of the rotor 4 shown in FIGS. 1 and 3. A central portion of the rotor 4 has in section a rhomboid shape and the central inner portion is empty.

[0185] FIG. 23 shows a rotor 4 similar to the one of FIG. 12 (two turbomachines 1 with vanes 10). Differently from FIG. 12, the helical conduit 14 is only one and has an inlet 15 located between vanes 10 of subsequent stages of a first turbomachine 1 and an outlet 16 located between vanes 10 of subsequent stages of a second turbomachine 1. FIG. 24 shows an enlargement of the outlet 16 and shows the speeds of the first fluid in proximity of a radially outer surface of the rotor 4. FIG. 25 shows an enlargement of the inlet 15 and shows the speeds of the first fluid in proximity of the radially outer surface of the rotor 4. In this case, the first fluid and the second fluid are the same fluid and, as it can be noted, the extraction or the insertion of the fluid to the base of the vanes 10 energizes or draws the boundary layer so as to limit the formation of vortexes and increase the performance of the turbomachine 1.

[0186] FIG. 26 shows a rotor 4 with only one blading, wherein the helical conduit 14 has an axial inlet 15 and an outlet 16 placed between vanes 10 of subsequent stages. In this case, the second fluid which passes in the helical conduit 14 is used for energizing the boundary layer of the first fluid. For example, the first fluid is a natural gas and the second fluid is hydrogen.

LIST OF ELEMENTS

[0187] turbomachine 1 [0188] case 2 [0189] central portion 3 of the case [0190] rotor 4 [0191] sleeve 5 [0192] tubular body 6 [0193] cylindrical base 7 [0194] distal portion 8 [0195] radially outer surface 9 [0196] vanes 10 [0197] transit volume 11 [0198] inlet 12 transit volume [0199] outlet 13 transit volume [0200] helical conduit 14 [0201] inlets 15 helical conduit [0202] outlet 16 helical conduit [0203] shaft 17 [0204] bearings 18 [0205] diffuser 19 [0206] distributor 20 [0207] loop 21 [0208] septum 22 [0209] fixed blades 23 [0210] directional blades 24 [0211] radial supports 25 [0212] internal tubular body 26 [0213] first outlet 27 [0214] first inlet 28 [0215] second inlet 29 [0216] second outlet 30 [0217] rear wall 31 [0218] refrigeration apparatus 32 [0219] evaporator 33 [0220] condenser 34 [0221] electric motor 35 [0222] inlet 36 condenser [0223] outlet 37 condenser [0224] inlet 38 evaporator [0225] outlet 39 evaporator [0226] end 40 shaft [0227] body 41 [0228] radial supports 42 [0229] passage 43 for atmospheric air [0230] statoric vanes 44 [0231] sectors 45 [0232] auxiliary loop 46 [0233] first part 47 [0234] second part 48 [0235] empty portion 49 [0236] Hirth tooth 50 [0237] plate 51