INTEGRATED MOTOR-COMPRESSOR ASSEMBLY

Abstract

The integrated motor-compressor assembly (1) comprises: – a gas inlet (7), – a drive shaft (3), magnetic bearings (9, 10) supporting the drive shaft (3), – a first compression section (4) overhanging at a first end of the drive shaft and configured to compress a gas flowing at the gas inlet of the integrated motor-compressor assembly, and – a second compression section (5) at a second end of the drive shaft. The first compression section comprises a cooling fan (12) configured to be driven by the drive shaft to supply a cooling loop (11) of the integrated motor-compressor assembly with a portion of the gas taken from the gas inlet of the integrated motor-compressor assembly, the portion of the gas being a cooling gas. Figure for abstract: Figure 1

Description

Title of the invention: INTEGRATED MOTOR-COMPRESSOR ASSEMBLY FIELD OF THE INVENTION

[0001] The present invention relates to an integrated motor-compressor assembly and in particular relates to a specific arrangement of a cooling fan. DESCRIPTION OF ASSOCIATED ART

[0002] An integrated motor-compressor assembly may include an electric motor mounted on a drive shaft to drive said shaft. The drive shaft is generally rotatably supported by two magnetic bearings arranged on either side of the electric motor.

[0003] A compression section may be arranged at each end of the drive shaft.

[0004] The electric motor and the magnetic bearings are subject to losses generated for example by eddy currents.

[0005] To cool the electric motor and magnetic bearings, the integrated motor-compressor assembly comprises a cooling loop comprising a filtering device filtering a portion of a gas compressed by a first compression section, the portion of compressed gas being the cooling gas flowing into the electric motor and bearings.

[0006] When the pressure of the compressed gas is too high to supply the cooling loop, a control valve expands the compressed gas filtered by the filtering device to reduce the pressure of the compressed gas to a predetermined pressure.

[0007] However, to reduce the pressure of the cooling gas, the control valve dissipates part of an energy used to drive the first compression section to compress the gas, which reduces the efficiency of the integrated motor-compressor assembly.

[0008] Furthermore, the control valve is a pressure-regulated component that can fail, reducing the reliability of the integrated motor-compressor assembly.

[0009] There is a need to avoid at least some of the aforementioned disadvantages. SUMMARY

[0010] According to one aspect, a novel integrated motor-compressor assembly is provided.

[0011] The integrated motor-compressor assembly comprises: - a gas inlet, - a drive shaft, - magnetic bearings supporting the drive shaft, - a first compression section overhanging at a first end of the drive shaft and configured to compress a gas flowing at the gas inlet of the integrated motor-compressor assembly, and - a second compression section at a second end of the drive shaft.

[0012] The first compression section includes a cooling fan configured to be driven by the drive shaft to supply a cooling loop of the integrated motor-compressor assembly with a portion of the gas taken from the gas inlet of the integrated motor-compressor assembly, the portion of the gas being a cooling gas.

[0013] Advantageously, the first compression section comprises a radial gas inlet connected to the gas inlet of the integrated motor-compressor assembly and a casing, the cooling fan comprising a fan compression wheel arranged overhanging in the casing at the first end of the drive shaft, the fan compression wheel of the fan being configured to be driven by the drive shaft to compress the cooling gas.

[0014] Preferably, the first compression section comprises a radial gas inlet connected to the gas inlet of the integrated motor-compressor assembly and the cooling fan is arranged overhanging the first end of the drive shaft, the cooling fan comprising the casing having a fan compression wheel and a gas inlet connected to the radial gas inlet of the first compression section.

[0015] Advantageously,

[0016] - the first compression section comprises an axial gas inlet connected to the gas inlet of the integrated motor-compressor assembly, a hood and an overhanging closed turbine arranged in the hood with a gap,

[0017] - the closed turbine comprising an intermediate part comprising a first part and a second part, the first part being connected to the second part and the second part connecting the first part to the drive shaft, the closed turbine further comprising a bladed part arranged on the second part and a cover surrounding the first part and the bladed part, the cover comprising a cover opening facing the first part, a fan compression wheel being inserted into the cover opening and extending outside the closed turbine, a gas supply channel being formed between the first part and the cover and configured to supply the fan compression wheel and the bladed part with gas flowing into the axial gas inlet of the first compression section,

[0018] - the hood includes a hood opening facing the compression wheel fan and configured to be connected to the cooling loop and a fan sealing arrangement arranged in the gap on each side of the cowl opening in an axial direction of the closed turbine,

[0019] - the hood opening of the hood, the fan sealing arrangements and the fan compression wheel forming the cooling fan.

[0020] Advantageously, the first compression section comprises an axial gas inlet connected to the gas inlet of the integrated motor-compressor assembly, an overhanging turbine at the first end of the drive shaft is configured to compress the gas flowing into the axial gas inlet of the first compression section, a casing partially surrounding the turbine with a gap and sealing devices arranged in the gap to form a sealed chamber configured to supply the cooling loop with the cooling gas, the turbine further comprises a warhead at the free end of the turbine and a channel within the turbine, the warhead further comprising an opening connected to a first end of the channel to supply the channel with the cooling gas, a second end of the channel opening into the sealed chamber, the turbine, the channel and the sealed chamber forming the cooling fan.

[0021] Preferably, the channel extends along an oblique line relative to the axis of rotation of the turbine so that the cooling gas is compressed in the channel.

[0022] Advantageously, the turbine comprises an ejector for compressing the cooling gas flowing in the channel, the ejector being arranged in the casing.

[0023] Preferably, the warhead comprises an injector.

[0024] Advantageously, the integrated motor-compressor assembly further comprises:

[0025] - an electric motor mounted on the drive shaft configured to drive the drive shaft, and

[0026] - a cooling loop comprising a filtering device,

[0027] - the filtering device being connected to the cooling fan and to the motor electric so that a first portion of a compressed cooling gas, filtered by the filtering device, flows through the electric motor to cool the electric motor.

[0028] Preferably, the filtering device is further connected to each magnetic bearing so that a second portion of the filtered cooling gas flows through the magnetic bearings to cool the magnetic bearings.

[0029] Preferably, in a particular embodiment, the second compression section overhangs the second end of the drive shaft. Brief description of the drawings

[0030] Other advantages and characteristics of the invention will appear on examining the detailed description of embodiments, in no way restrictive, and the appended drawings in which:

[0031] [Fig.l] schematically illustrates an embodiment of an integrated motor-compressor assembly according to the invention;

[0032] [Fig.2] schematically illustrates a second embodiment of a first compression section of the integrated motor-compressor assembly according to the invention;

[0033] [Fig.3] schematically illustrates a third embodiment of the first compression section according to the invention;

[0034] [Fig.4] schematically illustrates a fourth embodiment of the first compression section according to the invention; and

[0035] [Fig.5] schematically illustrates a fifth embodiment of the first compression section according to the invention. DETAILED DESCRIPTION

[0036] Reference is made below to [Fig.l] which schematically represents a first embodiment of an integrated motor-compressor assembly 1.

[0037] The integrated motor-compressor assembly 1 comprises an electric motor 2 mounted on a drive shaft 3, two compression sections 4, 5 and a waterproof casing 6.

[0038] The electric motor 2 and the two compression sections 4, 5 are arranged in the waterproof housing 6.

[0039] A first compression section 4 overhangs at a first end of the drive shaft 3 and the second compression section 5 is at the second end of the drive shaft 3.

[0040] Each compression section 4, 5 comprises a gas inlet 4a, 5a and a gas outlet 4b, 5b.

[0041] In a first embodiment of the first compression section 4 shown in [Fig.l], the gas inlet 4a is a radial gas inlet.

[0042] The gas inlet 5a of the second compression section 5 is an axial gas inlet.

[0043] The gas inlet 4a of the first compression section 4 is connected to a gas inlet 7 of the integrated motor-compressor assembly 1, the gas inlet 5a of the second compression section 5 is connected to the gas outlet 4b of the first compression section 4 and the gas outlet 5b of the second compression section 5 is connected to a gas outlet 8 of the integrated motor-compressor assembly 1.

[0044] Each compression section 4, 5 may comprise a compression wheel 4c, 5c.

[0045] Each compression section 4, 5 comprises sealing devices 4d, 5d to prevent any gas leakage into the waterproof housing 6 from the compression section 4, 5.

[0046] The electric motor 2 is intended to drive the compression sections 4, 5 so that the first compression section 4 compresses a gas flowing into the gas inlet 7 of the integrated motor-compressor assembly 1 and distributes the compressed gas to the gas inlet 5a of the second compression section 5.

[0047] The electric motor 2 is further intended to drive the second compression section 5 to further compress the compressed gas delivered by the first compression section 4, the second compression section delivering the compressed gas to the gas outlet 8 of the integrated motor-compressor assembly 1.

[0048] The drive shaft 3 is supported by two bearings 9, 10 in the waterproof housing 6.

[0049] Each bearing 9, 10 comprises a radial bearing and / or an axial bearing.

[0050] Preferably, in a particular embodiment, the second compression section 5 overhangs the second end of the drive shaft 3.

[0051] The bearings 9, 10 may comprise gas bearings or preferably magnetic bearings.

[0052] It is assumed below that the bearings 9, 10 are magnetic bearings, each magnetic bearing 9, 10 comprising a radial magnetic bearing and / or an axial magnetic bearing.

[0053] A first bearing 9 is arranged between the first compression section 4 and the electric motor 2, and the second bearing 10 is arranged between the second compression section 5 and the electric motor 2.

[0054] The integrated motor-compressor assembly 1 further comprises a cooling loop 11.

[0055] The first compression section 4 further comprises a cooling fan 12 mounted above the drive shaft to supply the cooling loop 11 with a portion of the gas taken from the gas inlet 7 of the integrated motor-compressor assembly 1.

[0056] The integrated motor-compressor assembly 1 makes it possible to produce a double overhanging integrated motor-compressor assembly combined with a fan 12 in place of a control valve known in the prior art which generates a large pressure drop and a large flow drop in the integrated motor-compressor assembly.

[0057] The part of the gas taken at the gas inlet 7 of the integrated motor-compressor assembly 1 is called cooling gas.

[0058] In a first embodiment of the first compression section 4, the first compression section 4 comprises a casing 4e comprising the compression wheel 4c, the gas inlet 4a of the first compression section 4, the gas outlet 4b of the first compression section 4 and the cooling fan 12 comprising a fan compression wheel 12a.

[0059] The gas inlet 7 of the first compression section 4 leads to the low pressure portion of the compression wheel 4c of the first compression section 4 and to the low pressure portion of the fan compression wheel 12a.

[0060] The low pressure portion of the compression wheel 4c of the first compression section 4 faces the low pressure portion of the fan compression wheel 12a of the cooling fan 12.

[0061] A gas to be compressed by a compression wheel enters the low pressure portion of the compression wheel and exits the high pressure portion of the compression wheel. The pressure of the gas in the high pressure portion of the compression wheel is higher than the pressure of said gas in the low pressure portion of the compression wheel. The casing 4e of the first compression section 4 further comprises a fan gas outlet 12b discharging the cooling gas compressed by the fan compression wheel 12a.

[0062] The arrangement of the cooling fan 12 in the housing 4e of the first section 4 simplifies the power supply to the fan compression wheel 12a.

[0063] The cooling loop 11 further comprises a filtering device 13 comprising an inlet 13a connected to the gas outlet 12b of the cooling fan 12, and an outlet 13b connected to the electric motor 2 and to the magnetic bearings 9, 10.

[0064] The integrated motor-compressor assembly 1 further comprises an exhaust duct 14 connecting the interior of the waterproof casing 6 to the gas inlet 7 of the integrated motor-compressor assembly 1.

[0065] When the electric motor 2 drives the drive shaft 3, the cooling fan 12 compresses the cooling gas to supply the cooling loop 11 with compressed cooling gas and the filtering device 13 filters the compressed cooling gas. The compressed cooling gas flows into the electric motor 2 and the magnetic bearings 9, 10.

[0066] A first portion of the compressed cooling gas filtered by the filtering device 13 can flow through the electric motor 2 to cool the electric motor 2 and a second portion of the compressed cooling gas filtered by the filtering device 13 can flow through the magnetic bearings 9, 10 to cool the magnetic bearings 9, 10.

[0067] The first part of the compressed cooling gas heated by the electric motor 2 and the second part of the compressed cooling gas heated by the magnetic bearings 9, 10 are released inside the waterproof housing 6.

[0068] The heated cooling gas released into the waterproof housing 6 is discharged through the gas inlet 7 of the integrated motor-compressor assembly 1 via the exhaust duct 14.

[0069] The cooling fan 12 may be designed so that the pressure at the gas outlet 12b is equal to a determined pressure which is determined as a function of the flow of cooling gas circulating in the electric motor 2 and the bearings 9, 10, and as a function of the pressure drop in the cooling loop IL

[0070] As shown, the filtering device 13 may be arranged outside the waterproof housing 6.

[0071] Alternatively, the filtering device 13 may be arranged inside the waterproof housing 6.

[0072] Unfiltered gas may contain particles that may damage components inside the waterproof housing 6, for example damaging the bearings 9, 10 and the electric motor 2.

[0073] The particles may be a corrosion product of a process pipe, rust, water droplets carried by a process stream or solid particles in the treated gas flowing into the gas inlet 7.

[0074] The filtering device 13 is designed to remove these particles from the gas flowing into the gas inlet 7 of the integrated motor-compressor assembly 1.

[0075] [Fig.2] schematically represents a second embodiment of the first compression section 4.

[0076] The same references designate the same elements previously referenced in the embodiment of the integrated motor-compressor assembly 1 shown in [Fig.l].

[0077] Unlike the first embodiment of the first compression section 4, the cooling fan 12 comprises a casing 12c independent of the casing 4e of the first compression section 4.

[0078] The cooling fan 12 is arranged overhanging the first end of the drive shaft 3.

[0079] The low pressure portion of the compression wheel 4c of the first compression section 4 faces the high pressure portion of the fan compression wheel 12a of the cooling fan 12.

[0080] A gas to be compressed by a compression wheel enters the low pressure portion of the compression wheel and exits the high pressure portion of the compression wheel. The pressure of the gas in the high-pressure part of the compression wheel is higher than the pressure of said gas in the low-pressure part of the compression wheel. The cooling fan comprises a gas inlet 12d connected to the radial gas inlet 4a of the first compression section 4 and a gas outlet 12e connected to the inlet 13a of the filtering device 13.

[0081] [Fig. 3] schematically represents a third embodiment of the first compression section 4.

[0082] In the present embodiment, the first compression section 4 comprises an axial gas inlet 20 connected to the gas inlet 7 of the integrated motor-compressor assembly 1 and a gas outlet 21 connected to the gas inlet 5a of the second compression section 5.

[0083] The first compression section 4 comprises a cover 22 and an overhanging closed turbine 23 arranged in the cover with a spacing Gp.

[0084] The closed turbine 23 is connected to the drive shaft 3 to compress the gas flowing into the axial gas inlet 20.

[0085] The closed turbine 23 comprises a warhead 24 at the free end of the closed turbine 23 and an intermediate part 25 connecting the warhead 24 to the drive shaft 3.

[0086] The warhead 24 and the intermediate part 25 may be in one piece.

[0087] The intermediate part 25 comprises a first part 26 and a second part 27, the first part 26 connecting the warhead 24 to the second part 27 and the second part 27 connecting the first part 26 to the drive shaft 3.

[0088] The first part 26 comprises a first end 26a connected to the warhead 24 and a second end 26b opposite the first end 26a.

[0089] The second end 26b of the first part 26 is connected to a first end 27a of the second part T1.

[0090] The second part 27 comprises a second end 27b opposite the first end 27a of the second part 27 and connected to the drive shaft 3.

[0091] The closed turbine 23 further comprises a bladed portion 28 arranged on the second portion 27 and a cover 29 surrounding the first portion 26 and the bladed portion 28.

[0092] The bladed portion 28 comprises fins for compressing a gas.

[0093] Since the blade portion 28 is not arranged on the first portion 26, no fins are fixed on the first portion 26 so that a gas supply channel 30 is formed between the first portion 26 and the cover 29.

[0094] The cover 29 comprises a cover opening 31 facing the first part 26.

[0095] A fan compression wheel 32 is inserted into the opening of the cover 31 and extends outside the closed turbine 23.

[0096] The fan compression wheel 32 may be integrated into the cover 29, the cover 29 and the fan compression wheel 32 being, for example, molded.

[0097] Alternatively, the compression wheel 32 is inserted into the cover 29, for example the blades of the compression wheel 32 are screwed or welded or brazed onto the cover 29.

[0098] The hood 22 comprises a hood opening 33 facing the compression wheel 32 of the closed turbine 23 and connected to the inlet 13a of the filtering device 13 through a conduit 34.

[0099] A fan sealing arrangement 35 is arranged in the spacing Gp on each side of the cowl opening 33 depending on an axial direction of the closed turbine 23.

[0100] Each fan sealing arrangement 35 may comprise a labyrinth.

[0101] The cowl opening 33 of the cowl 22, the fan sealing arrangements 35 and the fan compression wheel 32 form the cooling fan.

[0102] The gas supply channel 30 supplies the blade portion 28 and the fan compression wheel 32 with gas flowing into the axial gas inlet 20 of the first compression section 4.

[0103] When the drive shaft 3 drives the closed turbine 23, the fan compression wheel 32 compresses a first portion of the gas (cooling gas) supplied by the supply channel 30, the portion of the compressed gas (cooling gas) flowing into the inlet 13a of the filter device 13 through the cowl opening 33. The blade portion 29 compresses a second portion of the gas supplied by the supply channel 30, the second portion being equal to the gas supplied by the supply channel 30 minus the first portion of the gas, the second portion of the gas compressed by the blade portion 29 being discharged from the first compression section 4 through the gas outlet 21.

[0104] The first compression section 4 further comprises a sealing device 36 to prevent any leakage of compressed gas inside the waterproof housing 6, the sealing device 36 being arranged between the cover 22 and the drive shaft 3. The sealing device 36 may comprise a labyrinth.

[0105] [Fig.4] schematically represents a fourth embodiment of the first compression section 4.

[0106] In the present embodiment, the first compression section 4 comprises an axial gas inlet 40 connected to the gas inlet 7 of the integrated motor-compressor assembly 1 and a gas outlet 41 connected to the gas inlet 5a of the second compression section 5.

[0107] The first compression section 4 comprises a cover 42 and a turbine 43 overhanging the first end of the drive shaft 3.

[0108] The turbine 43 is arranged in the cover 42.

[0109] A casing 44 partially surrounds the turbine 43 with a spacing.

[0110] Sealing devices 45 are arranged in the gap to form a sealed chamber 44a.

[0111] The casing 44 further comprises an outlet 46 connected to the inlet 13a of the filtering device 13.

[0112] Each sealing device 45 may comprise a labyrinth.

[0113] The turbine 43 further comprises a warhead 47 at the free end of the turbine 43 and a channel 49 inside the turbine 43.

[0114] As shown, the warhead 47 may be conical.

[0115] An opening 48 is connected to a first end of the channel 49 and a second end of the channel 49 opens into the sealed chamber 44a.

[0116] A portion of the gas flowing in the first compression section 4 flows into the channel 49, the portion of the gas flowing in the channel 49 being the cooling gas.

[0117] The turbine 43, the sealed chamber 44a and the channel 49 form the cooling fan.

[0118] The turbine 43 may further comprise an ejector 50 arranged in the casing 44 to compress the cooling gas flowing in the channel 49.

[0119] When the drive shaft 3 drives the turbine 43, the turbine 43 compresses the gas and the cooling gas flows through the channel 49 into the sealed chamber 44a. The ejector 50 driven by the drive shaft 3 compresses the cooling gas into the sealed chamber 44a.

[0120] The compressed cooling gas flows through the outlet 46 of the sealed chamber 44a to supply the filtering device 13.

[0121] [Fig.5] schematically represents a fifth embodiment of the first compression section 4.

[0122] In the present embodiment, the first compression section 4 comprises an axial gas inlet 55 connected to the gas inlet 7 of the integrated motor-compressor assembly 1 and a gas outlet 56 connected to the gas inlet 5a of the second compression section 5.

[0123] The first compression section 4 comprises a cover 57 and a turbine 58 overhanging the first end of the drive shaft 3.

[0124] The turbine 58 is arranged in the cover 57.

[0125] A casing 59 partially surrounds the turbine 58 with a spacing.

[0126] Sealing devices 60 are arranged in the gap to form a sealed chamber 59a.

[0127] The casing 59 further comprises an outlet 61 connected to the inlet 13a of the filtering device 13.

[0128] Each sealing device 60 may comprise a labyrinth.

[0129] The turbine 58 further comprises a warhead 62 at the free end of the turbine and a channel 63 inside the turbine.

[0130] An opening 64 is connected to a first end of the channel 63 and a second end of the channel 63 opens into the sealed chamber 59a.

[0131] The turbine 58, the sealed chamber 59a and the channel 63 form the cooling fan.

[0132] The warhead 62 may comprise an injector 62a.

[0133] The channel 63 extends along an oblique line relative to an axis of rotation of the turbine 58 so that the cooling gas is compressed in the channel 63.

[0134] In another variant, the warhead 62 does not include the injector 62a and may be conical.

[0135] The injector 62a reduces the pressure drop in the first compression section 4 to save energy for compressing the gas flowing into the axial gas inlet 55.

[0136] The first compression section 4 may comprise the ejector 50 as shown in [Fig.4] in the fourth embodiment of the first compression section 4.

[0137] It goes without saying that the turbine 43 in the fourth embodiment of the first compression section 4 may comprise the injector 62a.

[0138] A portion of the gas flowing in the first compression section 4 flows into the channel 63, the portion of the gas flowing in the channel 63 being the cooling gas.

[0139] When the drive shaft 3 drives the turbine 58, the turbine 58 compresses the gas and the cooling gas flows through the channel 63 into the sealed chamber 59a. The injector 62a driven by the drive shaft 3 includes the cooling gas flowing in the channel 63 so that the cooling gas is compressed before entering the channel 63.

[0140] The orientation of the channel 63 along an oblique line makes it possible to further compress the cooling gas entering the channel 63.

[0141] The compressed cooling gas flows through the outlet 61 of the sealed chamber 59a to supply the filtering device 13.

[0142] The sealing devices 4d, 5d, 36, 45, 60 may comprise labyrinths and may further comprise intermediate connecting lines (not shown) to the gas inlet 7 and the gas outlet 13b. An arrangement of the labyrinths and the various connecting lines is established so that no unfiltered gas can enter the bearing and compressor elements, such as the bearing 9, 10 and the electric motor 2.

[0143] Each connecting line may comprise a pipe.

[0144] The sealing devices 4d, 5d, 36, 45, 60 prevent this unfiltered gas from flowing inside the internal bearings 9, 10 and the electric motor 2.

[0145] “Overhang” means that a component of the integrated motor-compressor assembly, such as the fan compression wheel 12a, the cooling fan 12, the turbine 43, 58, the closed turbine 23, the first compression section 4 or the second compression section 5, is not located between the first and second bearings 9, 10.

[0146] Said component is positioned overhanging relative to the first or second bearing 9, 10.

[0147] In the first and second embodiments of the first compression section 4, the cooling gas for cooling the electric motor 2 and the bearings 9, 10 is taken from the gas inlet of the integrated motor-compressor assembly 1 so that the cooling gas is not compressed by a compression section 4, 5 of the integrated motor-compressor assembly 1.

[0148] Cooling gas is supplied into the cooling loop by rotation of the cooling fan to cool components inside the watertight housing 6, for example the electric motor 2 and the bearings 9, 10.

[0149] Since the energy consumed by the cooling fan to supply the cooling loop with cooling gas is less than the energy consumed to compress the cooling gas in the first compression section, the energy consumed by the integrated motor-compressor assembly 1 is reduced compared to an integrated motor-compressor assembly 1 comprising a cooling loop known in the prior art.

[0150] Furthermore, in the first to fifth embodiments of the first compression section 4, the cooling fan is integrated into the first compression section and the cooling loop does not include a control valve configured to expand a compressed cooling gas (energy destruction).

[0151] Since no energy is destroyed by the expansion of a compressed cooling gas, the efficiency of the integrated motor-compressor assembly 1 is increased in comparison with a motor-compressor assembly comprising a cooling loop comprising a control valve known in the prior art.

[0152] Furthermore, the reliability of the cooling fan is greater than the reliability of a regulated control valve expanding a gas to a predetermined pressure known in the prior art, thereby increasing the reliability of the integrated motor-compressor assembly 1.

Claims

Claims

1. An integrated motor-compressor assembly (1) comprising: - a gas inlet (7), - a drive shaft (3), - magnetic bearings (9, 10) supporting the drive shaft (3), - a first compression section (4) overhanging at a first end of the drive shaft and configured to compress a gas flowing at the gas inlet of the integrated motor-compressor assembly, and - a second compression section (5) at a second end of the drive shaft, characterized in that the first compression section comprises a cooling fan (12) configured to be driven by the drive shaft to supply a cooling loop (11) of the integrated motor-compressor assembly with a portion of the gas taken from the gas inlet of the integrated motor-compressor assembly, the portion of the gas being a cooling gas.

2. An integrated motor-compressor assembly according to claim 1, wherein the first compression section (4) comprises a radial gas inlet (4a) connected to the gas inlet of the integrated motor-compressor assembly and a casing (4e), the cooling fan (12) comprising a fan compression wheel (12a) arranged overhanging in the casing at the first end of the drive shaft (3), the fan compression wheel of the fan being configured to be driven by the drive shaft to compress the cooling gas.

3. An integrated motor-compressor assembly according to claim 1, wherein the first compression section (4) comprises a radial gas inlet (4a) connected to the gas inlet of the integrated motor-compressor assembly and the cooling fan (12) is arranged overhanging at the first end of the drive shaft (3), the cooling fan comprising a housing (12c) having a fan compression wheel (12a) and a gas inlet (12d) connected to the radial gas inlet (4a) of the first compression section.

4. An integrated motor-compressor assembly according to claim 1, wherein: - the first compression section (4) comprises an axial gas inlet (20) connected to the gas inlet of the integrated motor-compressor assembly, a cover (22) and an overhanging closed turbine (23) arranged in the cover with a gap (Gp), - the closed turbine (23) comprising an intermediate portion (25) having a first portion (26) and a second portion (27), the first portion (26) being connected to the second portion (27) and the second portion (27) connecting the first portion (26) to the drive shaft (3), the closed turbine (23) further comprising a blade portion (28) arranged on the second portion (27) and a cover (29) surrounding the first portion (26) and the blade portion (28), the cover (29) being arranged in the axial direction of ... ) comprising a cover opening (31) facing the first part,a fan compression wheel (32) being inserted into the cover opening and extending outside the closed turbine (23), a gas supply channel (30) being formed between the first part and the cover and configured to supply the fan compression wheel and the bladed part with gas flowing into the axial gas inlet of the first compression section, - the cover (22) comprising a cover opening (33) facing the fan compression wheel (32) and configured to be connected to the cooling loop (11) and a fan sealing arrangement (35) arranged in the spacing on each side of the cover opening in an axial direction of the closed turbine, - the cover opening (33) of the cover (22), the fan sealing arrangements (35) and the fan compression wheel (32) forming the fan of cooling.,

5. An integrated motor-compressor assembly according to claim 1, wherein the first compression section (4) comprises an axial gas inlet (40, 55) connected to the gas inlet of the integrated motor-compressor assembly, a turbine (43, 58) overhanging the first end of the drive shaft (3) and configured to compress the gas flowing into the axial gas inlet of the first compression section, a casing (44, 59) partially surrounding the turbine with a gap and sealing devices (45, 60) arranged in the gap to form a sealed chamber (44a, 59a) configured to supply the cooling loop (11) with cooling gas, the turbine further comprises a nose cone (47, 62) at the free end of the turbine and a channel (49, 63) inside the turbine, the nose cone further comprising an opening (48, 64) connected to a first end of the channel to supply the channel with cooling gas, a second end of the channel opening into the sealed chamber, the turbine, the channel and the sealed chamber forming the cooling fan.

6. An integrated motor-compressor assembly according to claim 5, wherein the channel (63) extends along a line oblique to an axis of rotation of the turbine (58) so that the cooling gas is compressed in the channel.

7. An integrated motor-compressor assembly according to claim 5 or 6, wherein the turbine (43) comprises an ejector (50) for compressing the cooling gas flowing in the channel, the ejector being arranged in the casing (44).

8. An integrated motor-compressor assembly according to any one of claims 5 to 7, wherein the warhead (62) comprises an injector (62a).

9. An integrated motor-compressor assembly according to any one of claims 1 to 8, further comprising: - an electric motor mounted on the drive shaft configured to drive the drive shaft, and - a cooling loop (11) comprising a filtering device (13), - the filtering device being connected to the cooling fan (12) and the electric motor (2) such that a first portion of a compressed cooling gas, filtered by the filtering device, flows through the electric motor to cool the electric motor.

10. An integrated motor-compressor assembly according to claim 9, wherein the filtering device (13) is further connected to each magnetic bearing so that a second portion of the gas from 16 Filtered cooling flows through the magnetic bearings to cool the magnetic bearings.

11. An integrated motor-compressor assembly according to any preceding claim, wherein the second compression section (5) overhangs the second end of the drive shaft (3).

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