EP2475893B1 - Radial compressor and method for producing a radial compressor - Google Patents

Description

The invention relates to a radial compressor according to the preamble of patent claim 1 and a method for manufacturing a radial compressor according to the preamble of patent claim 8.

From the WO 2005/045201 A1 For example, a radial compressor and a method of manufacturing a radial compressor are known.

From the EP 0 484 110 A1 and from the DE 25 52 466 A1 Diffusers are known from radial compressors. The from the DE 25 52 466 A1 known diffuser is composed of two halves.

Single and multi-stage centrifugal compressors, in which one or more compressor impellers are arranged on a compressor shaft in a compressor housing of the respective radial compressor, have for flow guidance the compressor impellers of the respective radial compressor layered in an axial direction of the radial compressor layered or successively arranged stator components, which together form a stator form the radial compressor.

The last stator component of each stage group contains a fluid passage which collects the fluid to be compressed and supplies it to a pressure port through which the fluid leaves the compressor housing and is fed to a subsequent process. This fluid passage, which accordingly serves for discharging fluid which has been accelerated via the last compressor impeller, can be designed as a collecting space or as a spiral space.

The term "spiral space" refers to a space which develops over the circumference of the radial compressor or last stator part or increases in cross section. in the about a diffuser, for example, the gaseous or liquid fluid or medium is introduced and then discharged at a largest cross section of the spiral space from the compressor housing. By contrast, a collecting space is defined as a space which is constant across the circumference of the radial compressor or last stator part, wherein the gaseous or liquid fluid, for example, is introduced into the room via the diffuser and discharged from the compressor housing at any desired location.

In Fig.1 is the example of a single-stage barrel compressor, a prior art embodiment of a radial compressor 1 'shown schematically.

According to Fig.1 is in a compressor housing 10 'of the radial compressor 1' via a one of the compressor housing 10 'and an inlet insert 11' formed fluid inlet 12 'eg gaseous fluid in a compressor shaft 20' rotating compressor impeller 13 'is introduced and from the compressor impeller 13' out radially in a diffuser passage 16 'defined by an inner member 14' and a spiral / plenum body 15 'which conveys the fluid into a scroll / collection passage 15a' formed in the scroll / plenum body 15 '(a fluid passage for discharging over the last compressor impeller Fluid) initiates. Via the spiral / collecting passage 15a ', the fluid is passed to a fluid outlet 17' of the compressor housing 10 'and fed to a subsequent process.

Such a collecting space body or spiral space body having a collecting passage or spiral passage, which forms a fluid discharge element of a radial compressor, is usually produced as a cast part, wherein the collecting passage or spiral passage is produced, for example, by casting cores. However, castings have disadvantages in terms of their long delivery times and the models required for their manufacture, which in many cases are not reused can be and significantly increase the manufacturing cost of the castings, and in terms of their possibly fluctuating quality.

The variations in quality here relate in particular to the dimensional accuracy (in particular the dimensional accuracy of the collecting passage or spiral passage) and the material structure, which may be impaired in particular by blowholes in castings. Voids may in turn result in cracks and machining problems, or even the need to discard the entire casting.

As a result, equipped with such conventional Fluidausleitelementen radial compressors for manufacturers of such compressors are problematic in terms of compliance with the required operating characteristics, such as reliability and reliability, and compliance with the agreed delivery times. Thus, the manufacture of such radial compressors can be associated with high cost risks for manufacturers, e.g. in terms of penalties, increased procurement and / or transport costs, etc. Furthermore, such conventional radial compressors are problematic in terms of standardization and thus cost optimization of the manufacturing process.

The invention has for its object to provide a radial compressor of the type mentioned above, which has improved operating characteristics over conventional radial compressors and which can be produced with lower cost risks. The invention is further based on the object to provide a method for producing such a radial compressor.

The above objects are achieved with a radial compressor according to claim 1 and a method according to claim 8. Further developments of the invention are defined in the respective dependent claims.

According to a first aspect of the invention, a radial compressor comprises a compressor housing, a compressor shaft rotatably mounted in the compressor housing, at least one arranged in the compressor housing on the compressor shaft compressor impeller and a last compressor impeller of the centrifugal compressor in a fluid path in the compressor housing downstream Fluidausleitelement certain extension in a radial direction and an axial direction of the radial compressor.

According to the invention, the fluid discharge element has a fluid passage extending to a certain angular extent in a circumferential direction of the radial compressor for discharging fluid accelerated via the last compressor impeller from the compressor housing, wherein the fluid discharge element is formed of material having a defined material structure and the fluid passage is particularly in its Entity is formed as subsequently introduced spatial interruption in a substance cohesion of the material structure.

The angular dimension of the fluid passage is at least 90 degrees. The angle can also be at least 180 degrees or at least 270 degrees or approximately or exactly 360 degrees.

Defined material structure according to the invention means that a starting material for the Fluidausleitelement is in a solid state and expressly not in a molten state, wherein the entirety of any structural irregularities and pattern regularities form the material structure. In other words, the fluid passage forming a collection passage or a spiral passage is particularly in its entirety by separating material particles from, in particular, solid-walled or solid material Made starting material, so that a particle number and a volume of the finished Fluidausleitelements are lower than that of the starting material.

As provided for by the invention spatial interruption or repeal of the substance cohesion of such a defined material structure of Fluidausleitelements can be exclusively by a separation, such as cutting, cutting (eg milling, drilling, turning, grinding, etc.), Abtragen (eg spark erosion, laser cutting , Electron beam cutting, flame cutting, etc.), etc.

With a separation method, however, it is possible to work with the currently available e.g. CNC (Computer Numerically Controlled) machines, e.g. CNC milling machines, CNC spark erosion machines, etc., achieve significantly higher accuracies, especially for the fluid passage for discharging fluid accelerated over the last compressor impeller. This can be dispensed with a cost-intensive, lengthy and quality-fluctuating production of the fluid passage by means of casting cores.

A radial compressor with a fluid discharge element produced according to the invention thus always has the desired and therefore improved operating properties due to the fluid passage which is always of constant quality or dimensional accuracy for discharging fluid accelerated via the last compressor wheel. By the e.g. Thus, reduced risks in terms of delivery time-related and / or quality-related penalties and / or higher procurement costs and / or higher transport costs for the manufacturer of such a radial compressor are reduced overall cost risks in the production of the radial compressor.

In the radial compressor according to the invention, the Fluidausleitelement of a plurality of in the axial direction of the
Radial compressors stacked and interconnected Derleitelementteilen formed. The diverting element parts are preferably welded, soldered or screwed together. In addition, suitable connections may be provided to the compressor housing and adjacent internal portions of the radial compressor, such as common in barrel compressors or horizontally split centrifugal compressors.

The lamination according to the invention or stacking of several diverting element parts has the advantage that the total extension of the fluid diverting element in the axial direction of the radial compressor can be distributed to the several thickness dimensions or extensions in the axial direction of the radial compressor of the diverting element parts. Thus, the starting material to be used for the respective diverting element parts, at least in one dimension, namely here preferably in the thickness dimension extending in the axial direction of the radial compressor, is not subject to the restrictions or minimum size requirements imposed by the fluid diverting element as a whole. This ensures increased flexibility with regard to the basic dimensions of the starting material for the respective diverting element parts.

In the radial compressor according to the invention
the fluid passage extends into at least two diverting element parts of the plurality of diverting element parts.

The stacking according to the invention thus makes it possible, if a thickness dimension of the starting material available on the market for the respective diverting element parts is insufficient to form therein the entire cross section of the fluid passage, distributing the cross section over a plurality of diverting element parts. Thus, the skilled artisan in constructing the fluid passage or the Fluidausleitelementes substantially no constraints-related restrictions and thus can realize an optimal design.

In this connection, it should be noted that the fluid passage extends in a plurality of diverting element parts, both because of their cross-section and due to a possibly existing axial progression factor, wherein the fluid passage extends helically in the axial direction of the fluid diverting element.

According to one embodiment of the radial compressor according to the invention, a cross section of the fluid passage is constant along its extent in the circumferential direction.

According to this embodiment of the fluid passage, the fluid passage serves as a collecting space as defined above.

According to one embodiment of the radial compressor according to the invention, a cross section of the fluid passage increases along its extent in the circumferential direction, so that a fluid outlet of the fluid passage is arranged at a largest cross section thereof.

According to this embodiment of the fluid passage, the fluid passage serves as a spiral space as defined above.

According to one embodiment of the radial compressor according to the invention, the material of the Fluidausleitelements pressure-molded material, wherein the material structure of the Fluidausleitelements is formed as Druckumgeformt-material structure.

For the purposes of the invention, pressure-formed material is understood, for example, as forging material, cold-rolling material and hot-rolling material, drawing material, etc. Such materials are fast and inexpensive on the market as semi-finished products available. Furthermore, pressure-converted materials have a material structure which is improved with respect to air inclusions, since possibly existing air inclusions are forcibly smelted by the pressure forming after a prototyping and thus a more homogeneous material structure is created.

Preferably, the material of the Fluidausleitelements rolling material and in particular metal sheet, wherein the material structure of the Fluidausleitelements is formed as a rolling material structure.

In particular, metal sheets are available on the market in a variety of sheet thicknesses and material qualities. With the stacking of several diverting element parts according to the invention, the problem can be solved in a simple way that the sheet thickness available on the market is limited.

In other words, when the thickness dimension of the Fluidausleitelements exceeds the available sheet thickness on the market, simply a plurality of sheets (Ausleitelementteile) stacked and interconnected as described above. The geometric shape for the fluid passage can be introduced into each sheet individually or in the sheets in the layered state.

The inventive design of the Fluidausleitelements of several Ausleitelementteilen standard Ausleitelementteile can be defined for certain compressor sizes, so that at least the starting material for these and possibly even finished Ausleitelementteile can be kept in a warehouse. Thus, radial compressors according to the invention can have a higher degree of standardization, with which a cost optimization of the manufacturing process can be achieved. Furthermore, it is possible by a stockkeeping of certain Ausleitelementteilen to respond quickly and flexibly to customer requirements.

According to a second aspect of the invention, a method of manufacturing a radial compressor comprises at least the following steps: providing a compressor housing, providing a compressor shaft, providing at least one compressor impeller and locating it on the compressor shaft, rotatably supporting the compressor shaft in the compressor housing, and providing a fluid diverter element and Arranging it in a fluid path in the compressor housing downstream of a last compressor impeller of the radial compressor, wherein the Fluidausleitelement a certain extent in a radial direction and in an axial direction of the radial compressor and for discharging over the last compressor impeller accelerated fluid from the compressor housing to a certain angle in In a circumferential direction of the radial compressor extending fluid passage and wherein when providing the Fluidausleitelements the fluid passage in particular their entirety is introduced by a separation processing in the Fluidausleitelement.

The angular dimension of the Fluispassage is at least 90 degrees. The angle can also be at least 180 degrees or at least 270 or approximately or exactly 360 degrees.

Separating processing according to the invention may involve, for example, cutting and / or machining (e.g., milling, drilling, turning, grinding, etc.) and / or ablation (e.g., spark erosion, laser cutting, electron beam cutting, flame cutting, etc.).

With a separation process can be achieved with the currently available CNC machines, such as CNC milling machines, CNC spark erosion machines, etc., significantly higher accuracies, especially for the fluid passage for discharging accelerated over the last compressor impeller fluid. This can be on a cost-intensive, lengthy and quality-fluctuating production of the fluid passage by means of casting cores are dispensed with.

With the method according to the invention, the Fluidausleitelement and its fluid passage for discharging accelerated over the last compressor impeller fluid with consistently consistent quality or dimensional stability can be produced, whereby the desired operating characteristics can be ensured. By the e.g. The reduced risks with regard to delivery time-related and / or quality-related penalties for the manufacturer of a radial compressor thus reduce the overall cost risks involved in the production of the radial compressor.

According to one embodiment of the method according to the invention is used as the starting material for the Fluidausleitelement solid or solid material.

In other words, any suitable solid material available on the market can be used as the starting material, since the fluid passage is only subsequently worked out in its entirety by means of separation processing from the solid.

According to one embodiment of the method according to the invention, the fluid passage is introduced into the fluid discharge element by means of a cutting and / or an abrasive machining.

Particularly for spatially extending geometries such as the fluid passage suitable machining methods such as milling, spark erosion, laser cutting, electron beam cutting and flame cutting are performed by CNC machine. Thus, the geometry of the fluid passage in repeatable quality and high dimensional accuracy can be reliably produced. According to one embodiment of the method according to the invention, when providing the Fluidausleitelements a plurality of separate Ausleitelementteilen are stacked and interconnected so that the Ausleitelementteile are arranged in the axial direction of the radial compressor successively or side by side. The diverting element parts are preferably connected to one another, in particular welded, soldered or screwed together. In addition, suitable connections to the compressor housing and adjacent internal parts of the radial compressor may be provided, such as common in barrel compressors or horizontally split centrifugal compressors.

The lamination according to the invention or stacking of several diverting element parts has the advantage that the total extension of the fluid diverting element in the axial direction of the radial compressor can be distributed to the several thickness dimensions or extensions in the axial direction of the radial compressor of the diverting element parts. Thus, the starting material to be used for the respective diverting element parts, at least in one dimension, namely here preferably in the thickness dimension extending in the axial direction of the radial compressor, is not subject to the restrictions or minimum size requirements imposed by the fluid diverting element as a whole. This ensures increased flexibility with regard to the basic dimensions of the starting material for the respective diverting element parts.

According to one embodiment of the method according to the invention, the fluid passage is introduced so that it extends into at least two diverting element parts of the plurality of diverting element parts.

The stacking according to the invention thus makes it possible for a thickness dimension of the starting material available on the market for the respective diverting element parts not to be sufficient in order to cover the entire cross section form the fluid passage to distribute the cross section on a plurality of diverting element parts. Thus, the skilled artisan in constructing the fluid passage or the Fluidausleitelementes substantially no constraints-related restrictions and thus can realize an optimal design.

In this context, it should be noted that the fluid passage can be introduced distributed over a plurality of diverting element parts, both on account of their cross section to be realized and on the basis of an axial progression factor to be realized, wherein the fluid passage is introduced helically in the axial direction of the fluid diverting element.

According to one embodiment of the method according to the invention, the fluid passage is introduced so that a cross section of the fluid passage is constant along its extent in the circumferential direction.

In other words, the fluid passage is formed as a collecting space as defined above.

According to one embodiment of the method according to the invention, the fluid passage is introduced such that a cross section of the fluid passage increases along its extent in the circumferential direction, so that a fluid outlet of the fluid passage is arranged at a largest cross section thereof.

In other words, the fluid passage is formed as a spiral space as defined above.

According to one embodiment of the method according to the invention, pressure-molded material is used as starting material for the fluid discharge element.

As mentioned above, under pressure-formed material according to the invention, for example, forging material, cold rolling and hot rolling, drawing material, etc. understood. Such materials are available on the market quickly and inexpensively as semi-finished products. Furthermore, pressure-converted materials have a material structure which is improved with respect to air inclusions, since possibly existing air inclusions are forcibly smelted by the pressure forming after a prototyping and thus a more homogeneous material structure is created.

According to one embodiment of the method according to the invention, rolling stock, in particular sheet metal, is used as starting material for the fluid discharge element.

In particular, metal sheets are available on the market in a variety of sheet thicknesses and material qualities. With the stacking of several diverting element parts according to the invention, the problem can be solved in a simple way that the sheet thickness available on the market is limited.

In other words, when the thickness dimension of the Fluidausleitelements exceeds the available sheet thickness on the market, simply a plurality of sheets (Ausleitelementteile) stacked and interconnected as described above. The geometric shape for the fluid passage can be introduced into each sheet individually or in the sheets in the layered state.

The inventive production of Fluidausleitelements of several Ausleitelementteilen standard Ausleitelementteile can be defined for certain compressor sizes, so that at least the starting material for these and possibly even finished Ausleitelementteile can be kept in a warehouse. Thus, radial compressors according to the invention can have a higher degree of standardization, with which a cost optimization of the manufacturing process can be achieved. Furthermore, it is possible by a stockkeeping of certain Ausleitelementteilen to respond quickly and flexibly to customer requirements.

In conclusion, according to embodiments of both aspects of the invention, it is proposed to replace the castings for collecting space and / or spiral space by components which are predominantly machined from at least one sheet metal or sheet metal. With a suitable shaping of the flow-carrying fluid passages for collecting space or spiral space, these can be produced from one or, if there are insufficiently available sheet thicknesses, several layered metal sheets and / or by erosive and / or by cutting processes (laser, electron beam, flame cutting).

In layered sheets, these can be bolted together, soldered or welded. If the sheets are screwed together, the screw can also be part of the screwing of the entire stator.

The invention not only allows the use of sheets, but also allows the construction of a standard component system.

According to the invention, there is no restriction on single-stage centrifugal compressors, but the invention is also applicable, for example, for multi-stage centrifugal compressors both in barrel design as well as in horizontally split design.

According to one embodiment of the invention, the radial compressor is a single-shaft centrifugal compressor.

Fig.1

zeigt eine schematische Schnittansicht eines Radialkompressors gemäß dem Stand der Technik.

Fig.2

zeigt eine schematische Schnittansicht eines Radialkompressors gemäß einer Ausführungsform der Erfindung.

Fig.3A

zeigt eine perspektivische Explosionsansicht eines Fluidausleitelementes eines Radialkompressors gemäß einer Ausführungsform der Erfindung.

Fig.3B

zeigt eine perspektivische Zusammenbauansicht des Fluidausleitelementes von Fig.3A.

In the following the invention will be described with reference to preferred embodiments and with reference to the accompanying figures.

Fig.1

shows a schematic sectional view of a radial compressor according to the prior art.

Fig.2

shows a schematic sectional view of a radial compressor according to an embodiment of the invention.

3A

shows an exploded perspective view of a Fluidausleitelementes a radial compressor according to an embodiment of the invention.

3B

shows an assembled perspective view of the Fluidausleitelementes of 3A ,

The following is with reference to the Figures 2 . 3A and 3B a radial compressor 1 according to embodiments of the invention described.

As in the Figures 2 . 3A and 3B 1, the centrifugal compressor 1 comprises a compressor housing 10, a compressor shaft 30 rotatably mounted in the compressor housing 10, a fluid inlet 12 formed by the compressor housing 10 and an inlet insert 11 for introducing liquid or gaseous fluid, a compressor shaft 30 mounted on a compressor shaft 30 A supercharged compressor impeller 13, a diffuser passage 19 delimited by an inner part 14 and a fluid discharge element 15, a fluid passage 15a formed in the fluid discharge element 15 for discharging fluid accelerated via the compressor impeller 13 and a fluid outlet 20 in the compressor housing 10.

As in particular from Fig.2 it can be seen that here only compressor impeller 13 simultaneously forms a last compressor impeller of the radial compressor 1 in a fluid path in the compressor housing 10, wherein the Fluidausleitelement 15 is the compressor impeller 13 downstream in the fluid path.

The Fluidausleitelement 15 has a certain extent in a radial direction RR and an axial direction AR of the radial compressor 1. Like from the Figures 2 . 3A and 3B it can be seen, the Fluidausleitelement 15 of three in the axial direction AR of the radial compressor 1 stacked and interconnected Ausleitelementteilen 16, 17, 18 is formed, wherein the Ausleitelementteile 16, 17, 18 welded together, soldered or bolted (not shown in detail) are.

The fluid passage 15a extends in all three of the diverting member parts 16, 17, 18, so that the fluid passage 15a is moved by a certain angular extent, which is about 360 degrees here, in a circumferential direction UR (see FIG 3B ) of the radial compressor 1 and the Fluidausleitelements 15 extends.

As in particular from 3A and 3B As can be seen, a cross section of the fluid passage 15a increases along its extent in the circumferential direction UR, so that a fluid outlet 15b of the fluid passage 15a communicating with the fluid outlet 20 in the compressor housing 10 is arranged at a largest cross section of the fluid passage 15a.

According to an alternative embodiment not shown, the cross-section of the fluid passage 15a is constant along its extent in the circumferential direction UR.

The Fluidausleitelement 15 is made of a material having a defined material structure, namely according to embodiments of the invention from pressure-formed material and here in particular from rolled sheet metal. In other words, the material structure of the Fluidausleitelements 15 and the respective Ausleitelementteile 16, 17, 18 a Druckumgeformt-material structure and in particular a rolling material structure.

According to the invention, the fluid passage 15 a is introduced into the solid-walled starting material (metal sheet) of the fluid discharge element 15 by a separation process.

Thus, the fluid passage 15a represents a subsequently introduced spatial interruption in a substance cohesion of the material structure of the Fluidausleitelements 15.

In a simplest form, a method for manufacturing the radial compressor 1 thus comprises the following steps: providing the compressor housing 10, providing the compressor shaft 30, providing the compressor impeller 13 and placing it on the compressor shaft 30, rotatably supporting the compressor shaft 30 in the compressor housing 10, Provision of the Fluidausleitelements 15 with the by cutting, preferably by machining and / or abrasive machining, introduced into the Fluidausleitelement 15 fluid passage 15a and arranging the Fluidausleitelements 15 in the fluid path in the compressor housing 10 downstream of the compressor impeller 13th

According to embodiments of the method according to the invention, the Fluidausleitelement 15, as in the FIGS. 2 to 3B are shown, made of a plurality of stacked in the axial direction AR of the radial compressor 1 Ausleitelementteilen 16, 17, 18, wherein the Ausleitelementteile 16, 17, 18 are welded together, soldered or screwed.

The fluid passage 15a may be introduced to be in the same manner as in FIGS FIGS. 2 to 3B shown in all three diverting element parts 16, 17, 18, wherein the cross section of the fluid passage 15a may increase along its extent in the circumferential direction UR (as shown) or be constant (not shown).

The geometric shape for the fluid passage 15a may be inserted into each diverter member 16, 17, 18 individually (as in FIG 3A indicated) or in the diversion element parts 16, 17, 18 in the stratified state (as in FIG 3B indicated) are introduced.

As a starting material for the Fluidausleitelement 15 pressure-shaped material and preferably rolling material, in particular sheet metal, can be used.

LIST OF REFERENCE NUMBERS

1'

radial compressor

10 '

compressor housing

11 '

gate insert

12 '

fluid inlet

13 '

compressor impeller

14 '

inner part

15 '

Spiral / plenum body

15a '

Spiral / plenum

16 '

diffuser passage

17 '

fluid outlet

20 '

compressor shaft

1

radial compressor

10

compressor housing

11

gate insert

12

fluid inlet

13

compressor impeller

14

inner part

15

Fluidausleitelement

15a

fluid passage

15b

fluid outlet

16

Ausleitelementteil

17

Ausleitelementteil

18

Ausleitelementteil

19

diffuser passage

20

fluid outlet

30

compressor shaft

AR

axially

RR

radial direction

UR

circumferentially

Claims (16)

1. A radial compressor (1),
   having a compressor housing (10), with a compressor shaft (30) rotatably mounted in the compressor housing (10), having at least one compressor impeller (13) arranged on the compressor shaft (30) in the compressor housing (10), and having a fluid discharge element (15) of a defined extension in a radial direction (RR) and an axial direction (AR) of the radial compressor (1) located downstream of a last compressor impeller (13) of the radial compressor (1) in a fluid path in the compressor housing (10),
   wherein the fluid discharge element (15) comprising a fluid passage (15a) extends by a certain angular dimension in a circumferential direction (UR) of the radial compressor (1), which is designed as collection space or as spiral space, and which for discharge fluid accelerated via the last compressor impeller (13) leads out of the compressor housing (10) to a fluid outlet (20) in the compressor housing (10), which is in connection with a fluid outlet (15b) of the fluid discharge element (15), and
   wherein the fluid discharge element (15) is formed by material having a defined material structure and wherein the fluid passage (15a) is defined as subsequently introduced spatial interruption in a substance cohesion of the material structure,
   characterized in that the fluid discharge element (15) together with an inner part (14) limits a diffuser passage (19), wherein the angular dimension of the fluid passage (15a) of the fluid discharge element (15) extends in the circumferential direction (UR) of the radial compressor (1) being at least 90° and the fluid discharge element (15) is formed by a plurality of discharge element parts (16, 17, 18) stacked on top of one another and connected to one another in the axial direction (AR) of the radial compressor (1), wherein the fluid passage (15a) extends helically in the axial direction of the fluid discharge element (15) in at least two discharge element parts of the plurality of discharge element parts (16, 17, 18).
2. The radial compressor (1) according to Claim 1, wherein the discharge element parts (16, 17, 18) are welded, soldered or screwed to one another.
3. The radial compressor (1) according to Claim 1 or 2, wherein the fluid passage (15a) extends over an angular dimension of at least 180° or at least 270° in the circumferential direction (UR) of the radial compressor (1).
4. The radial compressor (1) according to any one of the Claims 1 to 3, wherein a cross section of the fluid passage (15a) is constant along its extension in the circumferential direction (UR).
5. The radial compressor (1) according to any one of the Claims 1 to 3, wherein a cross section of the fluid passage (15a) increases along its extension in the circumferential direction (UR) so that a fluid outlet (15b) of the fluid passage (15a) is arranged at a largest cross section of the same.
6. The radial compressor (1) according to any one of the Claims 1 to 5, wherein the material of the fluid discharge element (15) is pressure-formed material, and wherein the material structure of the fluid discharge element (15) is designed as pressure-formed material structure.
7. The radial compressor (1) according to Claim 6, wherein the material of the fluid discharge element (15) is rolled material and in particular sheet metal, and wherein the material structure of the fluid discharge element (15) is formed as rolled material structure.
8. A method for producing a radial compressor (1), comprising:

   providing a compressor housing (10),

   providing a compressor shaft (30),

   providing at least one compressor impeller (13) and arranging the same on the compressor shaft (30),

   rotatably mounting the compressor shaft (30) in the compressor housing (10),

   providing a fluid discharge element (15),

   wherein the fluid discharge element (15) has a certain extent in a radial direction (RR) and in an axial direction (AR) of the radial compressor (1), and wherein the fluid discharge element (15) for discharging fluid accelerated via the last compressor impeller (13) from the compressor housing (10) comprises a fluid passage (15a) extending by a certain angular dimension in a circumferential direction (UR) of the radial compressor (1), which is designed as collection space or as spiral space and which conducts the accelerated fluid to a fluid outlet (20) in the compressor housing (10), which is in connection with a fluid outlet (15b) of the fluid discharge element (15),

   forming the fluid discharge element (15) from material with a defined material structure and introducing the fluid passage (15a) into the fluid discharge element (15) by way of cutting machining characterized in that an inner part (14) is provided, the inner part (14) and the fluid discharge element (15) are arranged in a fluid path in the compressor housing (10) downstream of a last compressor impeller (13) of the radial compressor, wherein the fluid discharge element (15) together with an inner part (14) limits a diffuser passage (19), the fluid passage (15a) of the fluid discharge element (15) extending in the circumferential position (UR) of the radial compressor (1) has an angular dimension of at least 90° and

   when providing the fluid discharge element (15) a plurality of separate discharge element parts (16, 17, 18) are stacked on top of one another and are connected to one another so that the discharge element parts (16, 17, 18) are arranged in the axial direction (AR) of the radial compressor (1) one after the other,

   wherein the fluid passage (15a) extends helically in the axial direction of the fluid discharge element (15) in at least two discharge element parts of the plurality of discharge element parts (16, 17, 18).
9. The method according to Claim 8, wherein as starting material for the fluid discharge element (15) solid-walled material is used.
10. The method according to Claim 8 or 9, wherein the fluid passage (15a) is introduced into the fluid discharge element (15) by way of cutting and/or erosive machining.
11. The method according to Claim 10, wherein the discharge element parts (16, 17, 18) are welded, braced or screwed to one another.
12. The method according to Claim 10 or 11, wherein the fluid passage (15a) is introduced so that it extends over an angular dimension of at least 180° or at least 270° in the circumferential direction (UR) of the radial compressor (1).
13. The method according to any one of the Claims 8 to 12, wherein the fluid passage (15a) is introduced so that a cross section of the fluid passage (15a) is constant along its extension in the circumferential direction (UR).
14. The method according to any one of the Claims 8 to 12, wherein the fluid passage (15a) is introduced so that a cross section of the fluid passage (15a) increases along its extension in the circumferential direction (UR), so that a fluid outlet (15b) of the fluid passage (15a) is arranged on a largest cross section of the same.
15. The method according to any one of the Claims 8 to 14, wherein as starting material for the fluid discharge element (15) pressure-formed material is used.
16. The method according to Claim 15, wherein as starting material for the fluid discharge element (15) rolled material, in particular metal plate, is used.

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