FLOW MACHINE ARRANGEMENT

Description

[0001] The invention relates to a turbomachine arrangement.

[0002] From WO 2013 / 139568 A1, a turbomachine arrangement with a multi-stage compressor section and an electric machine is known, wherein the electric machine drives the compressor section to increase the pressure of a working medium. A compressor shaft of the compressor section runs coaxially to a shaft of the electric machine and is coupled to the shaft of the electric machine. The electric machine and the compressor section are arranged in a common housing and supported in the housing by bearings. Compressed working medium can be drawn from one stage of the compressor section as a cooling gas, which can be used to cool the electric machine.

[0003] A turbomachine arrangement with at least one single-stage or multi-stage compressor section and an electric machine driving the or each compressor section is also referred to as an integrated motor compressor.

[0004] From EP 1 074 746 B1, a turbo compressor with several compressor sections is known. The compressor sections and the electric motor that drives the compressor sections are arranged in a gas-tight housing and supported by bearings within the housing. The shaft of each compressor section and the shaft of the electric motor are coaxial and directly coupled. Compressed working fluid, which is diverted from a compressor section, serves to cool the electric motor.

[0005] DE 10 2007 019 264 A1 discloses a further turbo compressor. It is disclosed to extract compressed working fluid from a compressor stage of a compressor section of the turbo compressor, to guide it via a side chamber of the impeller, and from the side chamber of the impeller via a discharge channel into a collection chamber in order to supply this working fluid to a component to be cooled.

[0006] When compressed working fluid is extracted and used for cooling components of a turbomachine assembly in the compressor section, the disadvantage is a reduced overall efficiency of the turbomachine assembly. Furthermore, the compressed working fluid is already heated due to the compression process, which reduces its cooling capacity.

[0007] US 2016 / 0040915 A1 discloses a compressor driven by an electric machine, wherein the compressor shaft and the electric machine shaft are arranged coaxially, and two ejectors are provided. A first ejector serves to remove a fluid, and a second ejector serves to supply a fluid. Compressed working fluid is supplied to the first ejector via a line. A fluid, in this case water, is conveyed from a heat exchanger towards the first ejector via another line.

[0008] US 2020 / 340495 A1 discloses that partially compressed medium is extracted from a compressor, drawn in by a jet pump, and transported for cooling. Process fluid is not intended to enter the motor. The motor and compressor are housed in separate enclosures.

[0009] DE 10 2015 107 002 A1 reveals further state of the art.

[0010] There is a need for more efficient cooling of the electric machine of a turbomachine arrangement while maintaining a high overall thermodynamic efficiency of the turbomachine arrangement.

[0011] Based on this, the present invention aims to create a novel turbomachine arrangement. This objective is achieved by a turbomachine arrangement according to claim 1.

[0012] The turbomachine assembly comprises at least one single-stage or multi-stage compressor section for increasing the pressure of a working medium, such as a process gas, with each compressor section having a compressor shaft. The turbomachine assembly also includes an electric motor with a shaft. The compressor shaft of each compressor section is coaxial with the shaft of the electric motor.

[0013] The compressor shaft of the respective compressor section is preferably directly and without a transmission coupled to the shaft of the electric machine.

[0014] The electric motor and the respective compressor section are arranged in a common, hermetically sealed, one- or multi-part housing and supported by bearings within the housing, such that the compressor section, the electric motor, and the bearings are all surrounded by the working fluid. Uncompressed working fluid can be supplied to the turbomachine assembly via a feed line. Compressed working fluid can be discharged from the turbomachine assembly via a discharge line.

[0015] The turbomachine arrangement according to claim 1 further comprises at least one jet compressor to which working medium at a first pressure level can be supplied as a propellant via a first line or a first connection, and for the intake of working medium at a lower second pressure level via a second line or a second connection, wherein a mixture formed in the at least one jet compressor of the working medium at the first pressure level and the working medium at the second pressure level can be supplied to the electric machine and / or at least one other assembly to be cooled, in particular the bearings, via a third line or a third connection as a cooling medium.

[0016] The present invention proposes that the turbomachine arrangement comprises at least one jet compressor, to which the working medium at the first pressure level, preferably at least partially compressed, can be supplied as a driving medium, in order to draw in the working medium at the lower second pressure level via the pressure difference between the working medium at the first pressure level and the working medium at the lower second pressure level, preferably uncompressed, mix it with the working medium at the first pressure level and then supply this mixture to the electric machine and / or the at least one other assembly to be cooled for cooling purposes.

[0017] Since only part of the cooling medium flowing through or over the electric machine and / or the at least one other assembly to be cooled consists of the working medium at the first pressure level, preferably at least partially compressed working medium, and the other part consists of the working medium at the lower second pressure level, preferably uncompressed working medium, the cooling medium has a lower temperature. This also increases the overall thermodynamic efficiency of the turbomachine assembly. More efficient cooling of the electric machine can thus be achieved while maintaining a high overall thermodynamic efficiency of the turbomachine assembly.

[0018] In the turbomachine arrangement according to claim 1, a return line for the cooling medium guided over or through the electric machine and / or the at least one other assembly to be cooled is coupled to the supply line of the turbomachine arrangement in such a way that an outlet of the return line of the cooling medium into the supply line of the turbomachine arrangement is located downstream of a branch point of the second line or the second connection from the supply line of the turbomachine arrangement when viewed in the direction of flow through the supply line.

[0019] The branch point of the second line or the second connection serves to extract the working medium, which is under lower or lesser pressure, and to which at least one jet compressor is supplied.

[0020] By locating the outlet of the return line into the supply line downstream of the branch point of the second line or the second connection from the supply line, it is ensured that only uncompressed, cold working medium, which does not contain any returned cooling medium, is drawn in via the second line or the second connection through the jet compressor.

[0021] Preferably, the at least one jet compressor is coupled via the first line or the first connection to the compressor section or one of the compressor sections, or to the discharge line of the turbomachine assembly, or to a first leakage point of the turbomachine assembly. According to the invention, the at least one jet compressor is coupled via the second line or the second connection to the supply line of the turbomachine assembly, and preferably additionally to a second leakage point of the turbomachine assembly or a return line of the turbomachine assembly for cooling medium routed over or through the electric machine and / or the at least one other assembly to be cooled.

[0022] Preferably, a heat exchanger or cooler is integrated into the respective return line for the cooling medium to further increase efficiency. Integrating the heat exchanger into the return line for the cooling medium is particularly preferred for efficient cooling of the electric machine and / or the at least one other assembly to be cooled.

[0023] Preferably, to further increase efficiency, the at least one jet compressor is coupled to the compressor section or one of the compressor sections via the first line or the first connection, wherein, according to the invention, the at least one jet compressor is coupled to the supply line of the turbomachine assembly via the second line or the second connection. This coupling of the jet compressor to the compressor section and the supply line of the turbomachine assembly is particularly preferred in order to provide efficient cooling of the electric machine and / or the at least one other assembly to be cooled, such as the bearings, while maintaining a high overall thermodynamic efficiency of the turbomachine assembly.

[0024] Preferred embodiments of the invention are set forth in the dependent claims. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being limited thereto. The drawing shows: Fig. 1 is a highly schematic representation of a first turbomachine arrangement according to the invention; Fig. 2 is a highly schematic representation of a second turbomachine arrangement according to the invention; Fig. 3 is a highly schematic representation of a third turbomachine arrangement according to the invention; Fig. 4 is a highly schematic representation of a fourth turbomachine arrangement according to the invention; Fig. 5 is a highly schematic representation of a fifth turbomachine arrangement according to the invention; Fig. 6 is a highly schematic representation of a sixth turbomachine arrangement according to the invention; and Fig. 7 is a highly schematic representation of a turbomachine arrangement not according to the invention.

[0025] The invention presented here relates to a turbomachine arrangement 10, which is designed in particular as an integrated motor compressor.

[0026] Fig. 1 Figure 1 shows a first embodiment of a turbomachine arrangement 10 according to the invention, designed as an integrated motor-compressor, which has a compressor section 11 for increasing the pressure of a working medium, preferably for compressing a process gas. The compressor section 11 has in Fig. 1 via several compressor stages 12 and via a compressor shaft 13, wherein uncompressed working medium can be supplied to the compressor section 11 and thus to the turbomachine arrangement 10 via a supply line 14 of the turbomachine arrangement 10, and wherein compressed working medium can be discharged from the compressor section 11 and thus from the turbomachine arrangement 10 via a discharge line 15 of the turbomachine arrangement 10. The turbomachine arrangement 10, designed as an integrated motor-compressor, Fig. 1 The device further comprises an electric machine 16 with a shaft 17, wherein the electric machine 16 serves to drive the compressor section 11. The compressor shaft 13 and the shaft 17 of the electric machine 16 are coaxial with each other. Furthermore, the compressor shaft 13 and the shaft 17 of the electric machine 16 are preferably coupled directly and without a transmission.

[0027] The electric motor 16 and the compressor section 11 are arranged in a common, hermetically sealed, and therefore gas-tight, housing 18 and are rotatably mounted in the housing 18 via bearings 19. The gas-tight housing 18 can be designed as a single piece or in multiple parts. The compressor section 11, the electric motor 16, and the bearings 19 are all surrounded by the working medium, in particular the process gas.

[0028] The turbomachine arrangement 10 according to the invention has at least one jet compressor 20. The in Fig. 1 The jet compressor 20 shown can be supplied with working medium at a first pressure level as a propellant via a first line 21 or a first connection 22, and with working medium at a lower second pressure level via a second line 23 or a second connection 24 for the intake of working medium at a lower second pressure level, wherein a mixture formed in the jet compressor 20 of the working medium at the first pressure level and the working medium at the second pressure level can be supplied to the electric machine 16 and / or at least one other assembly to be cooled, such as the bearings 19, via a third line 25 or a third connection 26 as a cooling medium.

[0029] In Fig. 1 The jet compressor 20 can be supplied with at least partially compressed working medium as a propellant via the first line 21 or the first connection 22 for the intake of uncompressed working medium via the second line 23 or the second connection 24, wherein the mixture formed in the jet compressor 20 of the at least partially compressed working medium and of the uncompressed working medium can be supplied to the electric machine 16 and / or to at least one other assembly to be cooled, such as the bearings 19, via the third line 25 or the third connection 26 as a cooling medium.

[0030] The jet compressor 20 has a mixing chamber 20a and a diffuser 20b, the mixing chamber 20a providing the first connection 22 and the second connection 24, and the diffuser 20b providing the third connection 26. The partially compressed working medium supplied via connection 22 acts as a propellant, generating a pulsed jet of the working medium through a preferably adjustable nozzle, which enters the mixing chamber 20a. At least partially compressed working medium is supplied to the jet compressor 20 via the first connection 22 of the mixing chamber 20a from the compressor section 11 via the first line 21, which is then... Fig. 1 can be supplied to the working medium below the first pressure level, whereby in Fig. 1 the partially compressed working medium is diverted from compressor section 11 and directed to jet compressor 20.

[0031] This is because the partially compressed working medium, which is fed into the jet compressor 20 via the first line 21 or the first connection 22, has a higher pressure than the uncompressed working medium, which is fed into Fig. 1 The working medium, which is under the lower second pressure level, is directed into the jet compressor 20 via the second line 23 or the second connection 24. As a result of this pressure difference, uncompressed working medium can be drawn in via the preferably adjustable drive nozzle in the mixing chamber 20b of the steel compressor 20 from the supply line 14 of the turbomachine arrangement 10 via the second line 23 or the second connection 24, which is mixed with the at least partially compressed working medium in the area of ​​the mixing chamber 20a.

[0032] This mixture of the at least partially compressed working medium or the working medium at the first pressure level and the uncompressed working medium or the working medium at the second pressure level is supplied for cooling via the diffuser 20b of the jet compressor 20 and the third connection 26 provided by the diffuser 20b, as well as via the third line 25 of the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19.

[0033] The mixing ratio of partially compressed working medium, which in Fig. 1 the working medium below the first pressure level, and uncompressed working medium, which is in Fig. 1 The proportion of uncompressed working medium or working medium below the second pressure level, which corresponds to the working medium below the second pressure level, depends on the one hand on the design of the jet compressor and on the other hand on the pressure difference between the uncompressed working medium or the working medium below the second pressure level and the partially compressed working medium or the working medium below the first pressure level, whereby the proportion of uncompressed working medium or working medium below the second pressure level that is drawn in via the second line 23 is greater the higher the pressure difference between the at least partially compressed working medium or the working medium below the first pressure level and the uncompressed working medium or the working medium below the second pressure level.

[0034] Due to the fact that in Fig. 1 For cooling the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19, the mixture of at least partially compressed working fluid and uncompressed working fluid is passed over the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19. This results in a lower temperature of the cooling medium than in the prior art, in which only at least partially compressed working fluid is diverted from the compressor section 11 and passed over the electric machine 16 for cooling. This improves the cooling capacity and also provides an improved overall thermodynamic efficiency of the turbomachine arrangement 10.

[0035] In the illustrated embodiment of the Fig. 1 The jet compressor 20, namely its mixing chamber 20a, is therefore coupled via the first line 21 or the first connection 22 to the compressor section 11, namely a compressor stage 12 thereof. Furthermore, in Fig. 1 The jet compressor 20, namely its mixing chamber 20a, is coupled to the feed line 14 of the turbomachine arrangement 10 via the second line 23 or the second connection 24. Furthermore, the jet compressor 20, namely its diffuser 20b, is coupled to the electric machine 16 via the third line 25 or the third connection 26.

[0036] In Fig. 1 The electric machine 16 is coupled to the supply line 14 of the turbomachine assembly 10 via a return line 27 for the cooling medium carried through the electric machine 16, such that a termination point 27a of the return line 27 into the supply line 14 of the turbomachine assembly 10 is located downstream of a branch point 23a of the second line 23 from the supply line 14, viewed in the direction of flow through the supply line 14 of the turbomachine assembly 10. This ensures that only fresh working medium is drawn off via the second line 23.

[0037] Fig. 2 shows a further development of the turbomachine arrangement 10 of the Fig. 1 , wherein the turbomachine arrangement 10 of the Fig. 2 from the turbomachine arrangement 10 of the Fig. 1 The only difference is that a heat exchanger 28 or cooler is integrated into the return line 27 to cool the cooling medium before it is returned to the supply line 14 of the turbomachine assembly 10. This also serves to increase the overall thermodynamic efficiency. Otherwise, the turbomachine assembly 10 corresponds to the Fig. 2 with the turbomachine arrangement 10 of the Fig. 1 This is agreed upon, which is why, to avoid unnecessary repetition, the same reference numerals are used for identical assemblies, and reference is made to the explanations regarding the turbomachine arrangement 10 of the Fig. 1 is referred.

[0038] Fig. 3 shows a modification of the turbomachine arrangement 10 of the Fig. 1 , which differ from the Fig. 1 differs in that in the turbomachine arrangement 10 of the Fig. 3 Two compressor sections 11a, 11b are provided, each comprising a compressor stage 12a, 12b and a compressor shaft 13a, 13b, wherein these compressor sections 11a, 11b are arranged on opposite sides of the electric machine 16. Both compressor shafts 13a, 13b are preferably directly and without a transmission coupled to the shaft 17 of the electric machine 16 on different, opposite sides of the electric machine 16.

[0039] In Fig. 3 The two compressor sections 11a and 11b are connected in series. The working fluid compressed in compressor section 11a is further compressed in compressor section 11b. Alternatively, the compressor sections 11a and 11b can also be connected in parallel, in which case the first line 21 is connected to the discharge line of one of the two compressor sections 11a and 11b, as well as to the return line 27 for the cooling medium, which is connected to the supply line 14 of one of the two compressor sections 11a and 11b.

[0040] In Fig. 3 Compressor sections 11a and 11b can each have several compressor stages.

[0041] In Fig. 3 Partially compressed working fluid, which has been partially compressed by the first compressor section 11a, is fed to the second compressor section 11b for further compression via an overflow line 29 and also to the jet compressor 20 via the first line 21, which branches off from the overflow line 29. This allows the jet compressor 20, due to the pressure difference between the at least partially compressed working fluid and the uncompressed working fluid, to draw in uncompressed working fluid from the supply line 14 of the turbomachine assembly 10 and mix it with the partially compressed working fluid in the area of ​​the mixing chamber 20a of the jet compressor 20. This mixture is then fed from the jet compressor 20 to the electric machine 16 and / or to at least one other assembly requiring cooling, such as the bearings 19. Fig. 3 The discharge line 15 of the turbomachine arrangement 10 carries the compressed working medium away from the second compressor section 11b.

[0042] Fig. 4 shows a modification of the turbomachine arrangement 10 of the Fig. 3 , which differ from the exemplary embodiment of the Fig. 3 The only difference is that a heat exchanger 28 is integrated into the return line 27 for the cooling medium, which returns the cooling medium, which is carried over or through the electric machine 16, towards the supply line 14 of the turbomachine arrangement 10. Alternatively or additionally, coolers can also be integrated into lines 21, 23 and 25.

[0043] Except for the number and arrangement of the compressor sections, the exemplary embodiments of the Fig. 3, 4 with the exemplary embodiments of the Fig. 1, 2 alike, so that the same reference numbers are used for identical assemblies to avoid unnecessary repetition.

[0044] In Fig. 3 und 4 The compressor sections 11a and 11b can also be connected in parallel. In this case, the supply line 14 of the turbomachine arrangement 10 can then lead to both compressor sections 11a and 11b. Preferably, when the compressor sections 11a and 11b are connected in parallel, the first line 21 is connected to the discharge line of one of the two compressor sections 11a and 11b, as well as to the return line 27 for the cooling medium, which is connected to the supply line 14 of one of the two compressor sections 11a and 11b.

[0045] Fig. 5 shows a modification of the turbomachine arrangement 10 of the Fig. 3 , which differ from the turbomachine arrangement 10 of the Fig. 3 The difference lies in the fact that the propellant supplied to the jet compressor 20 via the first line 21 or the first connection 22 is not partially compressed working medium in the first compressor section 11a, but rather fully compressed working medium in the second compressor section 11b, so that therefore in Fig. 5 The first line 21 does not branch off from the overflow line 29, but rather from the discharge line 15 of the turbomachine arrangement 10. Therefore, in Fig. 5 a significantly higher pressure difference exists between the compressed working medium serving as propellant and the uncompressed working medium drawn in by the supply line, whereby in Fig. 5 The mixture of uncompressed working medium and compressed working medium formed in the jet compressor 20 preferably contains a higher proportion of uncompressed working medium than in Fig. 3 Regarding all other details, the exemplary embodiment of the Fig. 5 with the exemplary embodiment of Fig. 3 alike, so that in turn, to avoid unnecessary repetitions, the same reference numbers are used for identical assemblies.

[0046] Alternatively, in multi-stage compressor designs, the propellant can be used analogously to Fig. 1 can also be taken from an intermediate stage. According to an embodiment not covered by the claim, the lines 23 and 27 can terminate at the overflow line 29 instead of at the feed 14 of the turbomachine arrangement 10, so that the cooling medium is only taken off after the compressor section 11b and returned to the overflow line 29.

[0047] Fig. 6 shows a variation of the exemplary embodiment of the Fig. 5 , which differ from Fig. 5 in turn, it differs only in that the heat exchanger 28 is integrated into the return line 27 of the cooling medium for the cooling medium which is guided over or through the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19.

[0048] Fig. 7 shows a non-inventive turbomachine 10, which is a modification of the turbomachine arrangement 10 of the Fig. 4 represents. While in Fig. 4 The second line 23 branches off from the supply line 14 of the turbomachine arrangement 10 and the return line 27 of the cooling medium flows into the supply line 14 of the turbomachine arrangement 10, consists of Fig. 7 a closed circuit for the cooling medium, achieved by connecting the second line 23 to the return line 27 of the cooling medium. In Fig. 7 The propellant used in the first compressor section 11a is therefore a partially compressed working medium, which is branched off from the overflow line 29 and fed to the jet compressor 20 via the first line 21, whereas in Fig. 7 No uncompressed working medium is drawn in by the jet compressor 20, but rather the cooling medium is guided over or through the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19, which is discharged from the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19, via the return line 27 of the cooling medium. Accordingly, in Fig. 7 the second line 23 and the return line 27 of the cooling medium form a closed cooling circuit for the cooling medium, in which according to Fig. 7 A heat exchanger 28 is integrated.

[0049] Also in Fig. 7 The jet compressor 20 can be supplied with a working medium at a first pressure level via the first line 21 or the first connection 22 as a propellant, and with a working medium at a lower second pressure level via the second line 23 or the second connection 24 for the intake of a working medium at a lower second pressure level, wherein the mixture formed in the jet compressor 20 of the working medium at the first pressure level and the working medium at the second pressure level can be supplied to the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19, via the third line 25 or the third connection 26 as a cooling medium. Fig. 7 The working medium at the first pressure level is the working medium partially compressed in compressor section 11a; the working medium at the second pressure level is... Fig. 7 The cooling medium is routed over or through the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19, and is supplied via the cooling medium return line 27 and the cooler 28, the second line 23, and thus the second connection 24. The supply of the propellant gas via the first line 21 or the first connection 22 compensates for any losses of cooling medium in the circuit.

[0050] The invention allows efficient cooling of the electric machine 16 and / or the at least one other assembly to be cooled, such as the bearings 19 of a turbomachine arrangement 10, with a high overall thermodynamic efficiency of the turbomachine arrangement 10.

[0051] The invention makes it possible to use an electric machine 16 with a high power range in turbomachine arrangements 10.

[0052] The flow rate through the jet compressor 20 can be regulated by means of a preferably adjustable drive nozzle (not shown). However, to ensure maximum simplicity and robustness of the turbomachine arrangements 10, such a preferably adjustable drive nozzle can be omitted and the jet compressor 20 can be operated without regulation.

[0053] In the Fig. 1 bis 7 In the turbomachine arrangements 10 shown, the jet compressor 20 is positioned outside the housing 18, with at least some of the lines 21, 25, 29 extending at least partially outside the housing 18 and through the housing 18. Alternatively, it is also possible for the jet compressor 20 to be positioned inside the housing 18. Reference symbol list

[0054] 10 Fluid machine assembly 11 Compressor section 11a Compressor section 11b Compressor section 12 Compressor stage 12a Compressor stage 12b Compressor stage 13 Compressor shaft 13a Compressor shaft 13b Compressor shaft 14 Supply line 15 Discharge line 16 Electric machine 17 Shaft 18 Housing 19 Bearings 20 Jet compressor 20a Mixing chamber 20b Diffuser 21 First line 22 First connection 23 Second line 23a Branch point 24 Second connection 25 Third line 26 Third connection 27 Return line 27a Outlet point 28 Heat exchanger 29 Overflow line

Claims

1. A turbomachine assembly (10) with at least one single-stage or multi-stage compressor section (11, 11a, 11b) each for increasing the pressure of a work medium such as a process gas, wherein the respective compressor section (11, 11a, 11b) comprises a compressor shaft (13, 13a, 13b), with an electric machine (16) which comprises a shaft (17), wherein the respective compressor shaft (13, 13a, 13b) runs coaxially with the shaft (17) of the electric machine (16), wherein the respective compressor shaft (13, 13a, 13b) is coupled to the shaft (17) of the electric machine (16), wherein the electric machine (16) and the respective compressor section (11, 11a, 11b) arranged in a common hermetically sealed single-part or multi-part housing (18) and are mounted in the housing (18) via bearings (19) in such a manner that the work medium altogether flows around the respective compressor section (11, 11a, 11b), the electric machine (16) and the bearings (19), with a feed line (14), via which uncompressed work medium can be fed to the turbomachine assembly (10), with a discharge line (15), via which work medium compressed by the turbomachine assembly (10) can be discharged, with at least one jet compressor (20), which can be fed a work medium as propellant at a first pressure level via a first line (21) or a first connection (22), namely, for drawing in work medium at a lower second pressure level via a second line (23) or a second connection (24), wherein a mixture formed in the at least one jet compressor (20) out of the work medium at the first pressure level and the work medium at the second pressure level can be fed as cooling medium to the electric machine (16) and / or at least one other assembly to be cooled via a third line (25) or a third connection (26), characterised in that a return line (27) for the cooling medium conducted via or through the electric machine (16) and / or the at least one other assembly to be cooled is coupled to the feed line (14) of the turbomachine assembly in such a manner that an opening point (27a) of the return line (27) of the cooling medium into the feed line (14) of the turbomachine assembly, lies, seen in the flow direction of the feed line (14), downstream of a branching point (23a) of the second line (23) or of the second connection (24) of the feed line (14) of the turbomachine assembly.

2. The turbomachine assembly according to Claim 1, characterised in that the at least one jet compressor (20) can be fed via the first line (21) or the first connection (22) with at least partly compressed work medium as propellant for drawing in uncompressed work medium via the second line (23) or the second connection (24), wherein the mixture formed in the at least one jet compressor (20) from the at least partly compressed work medium and the uncompressed work medium can be fed as cooling medium to the electric machine (16) and / or to the at least one other assembly to be cooled via the third line (25) or the third connection (26).

3. The turbomachine assembly according to Claim 1 or 2, characterised in that the at least one jet compressor (20) is coupled via the first line (21) or the first connection (22) to the compressor section (11) or one of the compressor sections (11a, 11b) or to the discharge line (15) of the turbomachine assembly or to a first leakage point of the turbomachine assembly.

4. The turbomachine assembly according to any one of the Claims 1 to 3, characterised in that the at least one jet compressor (20) is additionally coupled via the second line (23) or the second connection (24) to the compressor section (11) or one of the compressor sections (11a, 11b) or to a second leakage point of the turbomachine assembly or the return line (27) of the turbomachine assembly for cooling medium conducted via or through the electric machine (16) and / or the at least one other assembly to be cooled.

5. The turbomachine assembly according to any one of the Claims 1 to 4, characterised in that the at least one jet compressor (20) is coupled via the third line (25) or the third connection (26) to the electric machine (16) and / or the at least one other assembly to be cooled.

6. The turbomachine assembly according to any one of the Claims 1 to 5, characterised in that a heat exchanger (28) or cooler is integrated in the return line (27) for the cooling medium.

7. The turbomachine assembly according to any one of the Claims 1 to 6, characterised by a single compressor section (11) with at least one compressor stage (12), which is or are arranged on a side of the electric machine (16) coaxially to the same.

8. The turbomachine assembly according to any one of the Claims 1 to 6, characterised by two compressor sections (11a, 11b) each with at least one compressor stage (12a, 12b), which are arranged on opposite sides of the electric machine (16) in each case coaxially to the same.