Magnetic rotor arrangement for side channel compressor of fuel cell system, side channel compressor and method for producing magnetic rotor arrangement for side channel compressor of fuel cell system

Abstract

The invention relates to a magnetic rotor arrangement (2) for a side channel compressor (1) of a fuel cell system (31) for conveying and / or compressing a gaseous medium, in particular hydrogen, the magnetic rotor arrangement (2) being rotatably mounted about an axis of rotation (4) and / or being drivable by means of a drive device (6), the magnetic rotor arrangement (2) has a compressor wheel (10), by means of which an air flow can be generated in particular in a compressor chamber (30), a hub (9), a return ring (22) and at least one bearing (27, 47). According to the invention, the hub (9) has a groove (13), which extends annularly about the axis of rotation (4) and can be enclosed by a rotor chamber (46), the loop (22) and at least two segment magnets (24), preferably four segment magnets (24), are located at least almost completely in the groove (13). Here, the loop (22) is connected to the hub (9) by means of at least one pin (42) and / or screw element (44). The invention further relates to a side channel compressor (1) and / or a fuel cell system (31) having the magnetic rotor arrangement (2) according to the invention and / or a method for producing the magnetic rotor arrangement (2).

Description

Technical Field

[0001] The invention relates to a magnetic rotor device for a side channel compressor of a fuel cell system, a side channel blower and a method for manufacturing a magnetic rotor device for a side channel blower of a fuel cell system. Background Art

[0002] In the field of vehicles, in addition to liquid fuels, gaseous fuels will also play an increasingly important role in the future. In particular, in vehicles with fuel cell drives, the hydrogen flow must be controlled. In this case, the gas flow is no longer controlled discontinuously as in the case of injecting liquid fuels, but the gaseous medium is extracted from at least one high-pressure tank and directed to the injection unit via the inflow pipeline of the medium-pressure pipeline system. The injection unit transports the gaseous medium to the fuel cell via the connecting pipeline of the low-pressure pipeline system. After the gaseous medium flows through the fuel cell, the gaseous medium is transported back to the injection unit via the return line. Therefore, a side channel compressor can be connected in the middle, which supports the gas return in terms of flow technology and efficiency technology. Here, the side channel compressor is used to support the flow structure in the fuel cell drive, especially when the vehicle is (cold) started after being stationary for a period of time. The driving side channel compressor is usually carried out via an electric motor, which is supplied with voltage by the vehicle battery when the motor vehicle is running.

[0003] A side channel compressor for a fuel cell system is known from the publication DE 10 2018 222 102 A1, in which a gaseous medium, in particular hydrogen, is transported and / or compressed. Here, the side channel compressor has a housing and a drive device, wherein the housing has a housing upper part and a housing lower part, the housing has a compressor chamber extending around a rotation axis in the housing, the compressor chamber has at least one surrounding side channel, the housing has a compressor wheel located in the housing, the compressor wheel is rotatably arranged around the rotation axis and is driven by the drive device. Here, the compressor wheel has blades arranged in the compressor chamber area on its circumference and has a gas inlet opening and a gas outlet opening constructed on the housing, the openings are fluidically connected to each other through the compressor chamber, in particular at least one side channel, wherein the side channel compressor has at least one bearing. In addition, it is shown in the publication DE 10 2018 222 102 A1 that the rotor assembly implemented as a permanent magnet can be located on a driving flange, which corresponds to the hub.

[0004] The side channel compressor known from the publication DE 10 2018 222 102 A1 may have some disadvantages. The rotor assembly and / or the permanent magnet are located on the driving flange and are not encapsulated by the rotor chamber, in particular the rotor assembly and / or the permanent magnet are not encapsulated by the rotor chamber fluid. When using the side channel compressor, hydrogen may penetrate into the rotor chamber and damage the metal assembly and / or the rotor assembly and / or the permanent magnet, in particular by hydrogen embrittlement. Therefore, this may lead to failure of the rotor assembly and / or the permanent magnet, so that the compressor wheel and / or the magnetic rotor device can no longer be driven by means of a drive device, in particular by means of a stator and a rotor assembly, so that the failure probability of the drive device and therefore the entire side channel compressor is increased.

[0005] Another disadvantage of the side channel compressor known from the publication DE 10 2018 222 102 A1 is that the return ring and / or the permanent magnet are pressed into the hub, in particular by forming a press fit through the inner diameter of the return ring and the hub, as a result of which stresses cause deformation of the hub, in particular of the bearing hole and / or the bearing seat, so that the bearing hole and the bearing seat have to be reprocessed, which increases the costs due to the additional method steps. Summary of the invention

[0006] Advantages of the invention

[0007] According to the invention, a magnetic rotor arrangement for a side channel compressor of a fuel cell system is provided for conveying and / or compressing a gaseous medium, in particular hydrogen, having the features of the independent claim. In this case, the magnetic rotor arrangement is at least almost completely located in a rotor chamber and is supported rotatably about an axis of rotation and / or is drivable by means of a drive device. In this case, the magnetic rotor arrangement has a compressor wheel, by means of which a gas flow can be generated, in particular in the compressor chamber, a hub, a return ring and at least one bearing.

[0008] According to claim 1, the hub has a groove which extends annularly around the axis of rotation and can be enclosed by the rotor chamber, wherein the ring and at least two segment magnets, ideally four segment magnets, are at least almost completely located in the groove. The ring is connected to the hub by means of at least one pin and / or a screw element.

[0009] On the one hand, the following advantages can be achieved in this way: a compact and space-saving arrangement and construction of the magnetic rotor device can be achieved, since the components such as the return ring and the segment magnets can be integrated in the recess and thus in the hub, whereby the magnetic rotor device is designed to be narrower in the direction of the rotation axis than the magnetic rotor devices of the prior art.

[0010] Furthermore, the following advantages can be achieved in this way: the loop is connected to the hub by means of at least one pin and / or screw element. Therefore, no further components are required to connect the loop and the hub, whereby the component costs can be reduced. Furthermore, a stable connection can be established between the loop and the hub by means of the use of at least one pin and / or screw element, so that the components, hub and loop, are connected to each other in a form-locked and / or material-locked and / or force-locked manner via the pin and / or screw element, so that the connection remains stable over the entire service life and the release of the connection can be at least virtually ruled out. As a result, the service life of the magnetic rotor device and / or the side channel compressor and / or the fuel cell system can be increased.

[0011] Advantageous developments of the magnetic rotor arrangement and / or of the side channel compressor specified in claim 1 are possible by means of the measures listed in the dependent claims. Advantageous developments of the invention preferably relate to the dependent claims.

[0012] According to an advantageous development of the magnetic rotor device, the corresponding pin and / or the corresponding screw element has a head and a body, wherein the head has a larger diameter than the body. In this way, a compact structural form of the connection between the ring and the hub can be achieved, in particular by means of the corresponding pin and / or the corresponding screw element. Here, the corresponding pin and / or the corresponding screw element can be in contact with other elements via the end face of its head and thus exert a force, in particular a pressure, on the other element, wherein the end face extends at least almost orthogonally to the axis of rotation. In this way, a connection can be constructed, which does not subject the corresponding pin and / or the corresponding screw element to shear forces, but rather establishes a force-locking connection with another element via the end face of the head. The failure probability of the pin and / or the screw element is thus reduced, so that the service life of the magnetic rotor device and / or the side channel compressor can be increased.

[0013] According to an advantageous extension of the magnetic rotor device, the corresponding pin and / or the corresponding screw element is located with the head in the first recess of the loop and with the body in the second recess of the loop and the third recess of the hub. In this way, the following advantages can be achieved: a reliable connection between the loop and the hub can be established without affecting the bearing seat of the hub and / or the compressor wheel. Here, the shape-locking and / or friction-locking connection between the loop and the hub has a high strength by means of the corresponding pin and / or the corresponding screw element, so that these components of the loop and the hub remain stably connected to each other throughout the service life of the side channel compressor or the fuel cell system. In addition, this connection of the components is implemented very compactly by means of the corresponding pin and / or the corresponding screw element, thereby reducing the structural size of the entire side channel compressor. This in turn can reduce the installation space required for the side channel compressor in the entire vehicle.

[0014] According to a particularly advantageous embodiment of the magnetic rotor device, the body of the respective pin has a larger diameter than the respective third recess, so that a non-positive and / or frictional connection, in particular a press fit, is formed between the respective pin and / or the hub. In this way, a simple and cost-effective connection of the hub and the pin can be achieved, wherein the service life of this connection can be ensured over the entire service life of the side channel compressor, so that the probability of failure of the magnetic rotor device and / or the side channel compressor can be reduced.

[0015] According to an advantageous construction scheme of the magnetic rotor device, the third recess in the hub has a thread, in particular an internal thread, and the corresponding screw element has a thread, in particular an external thread, in the body region, wherein the screw element and the hub are screwed. In this way, the screw element can be screwed into the hub by means of a fast and cost-effective method step, wherein a force-locking connection is achieved between the head of the screw element and / or the loop and / or the hub, in that the screw element is subjected to such a high screw-in torque that the screw element is elongated in the direction of the axis of rotation. This results in a reliable connection between the components of the screw element and / or the loop and / or the hub over the entire service life of the side channel compressor. In addition, if during the use of the components of the magnetic rotor device and / or the side channel compressor, for example when the loop must be replaced, the connection is non-destructively releasable. Maintenance costs can therefore be reduced.

[0016] According to an advantageous development of the magnetic rotor arrangement, the corresponding pin and / or the corresponding screw element extends at least approximately parallel to the axis of rotation or is positioned at least approximately parallel to the axis of rotation. In this way, the advantage is achieved that a cost-effective and rapid installation of the corresponding pin and the corresponding screw element can be achieved. Furthermore, the components of the ring and / or the hub can be processed cost-effectively before installation so that the holes for receiving the pin and / or the screw element can be aligned parallel to the bearing hole, which allows a simplified and cost-effective processing of the corresponding processing equipment of the hub and / or the ring. As a result, the processing costs and / or the installation costs can be reduced.

[0017] According to a particularly advantageous development of the magnetic rotor device, the corresponding pin and / or the corresponding screw element is located in the distal region of the threaded hole and the first center axis of the rotation axis. In this way, the connection between the ring and the hub can be arranged as far away from the bearing bore as possible, so that the configuration of the connection between the hub and the ring does not require a deformation and, if necessary, a reprocessing of the bearing bore. As a result, the costs of the magnetic rotor device, in particular the processing costs, can be reduced and / or the probability of failure of the magnetic rotor device due to bearing damage caused by deformation of the bearing bore can be reduced.

[0018] Since preferred areas of application of the magnetic rotor arrangement according to the invention are side channel compressors and / or fuel cell systems, a side channel compressor and / or a fuel cell system having a magnetic rotor arrangement according to the invention is furthermore proposed.

[0019] According to an advantageous construction scheme in the proposed method for manufacturing a magnetic rotor device for a side channel compressor and / or a fuel cell system, a loop is provided. Therefore, this loop is installed in a groove of the hub. Here, the loop is fixed to the hub by means of at least one pin and / or screw element, especially in a form-locked or force-locked manner. Here, the loop has at least two protrusions, which extend in particular in the direction of the axis of rotation, and a segment magnet is respectively installed between the two protrusions. In another method step, the corresponding segment magnet and the loop, in particular the end face of the loop, and / or with the corresponding protrusion are connected. This connection can be established by means of a form-locked and / or material-locked and / or force-locked method to construct a rotor assembly. In another exemplary method step, the closing plate is installed on the flange and the shoulder by means of a material-locked method, in particular laser welding.

[0020] In a particularly advantageous embodiment of the method, it is provided that in the method at least one pin is pressed with its body into the third recess in such a way that a non-positive and / or friction-locking connection is formed between the respective pin and the hub and the return ring and / or the rotor assembly is thus fixed to the hub. In this way, a compact design and cost-effective assembly of the rotor assembly can be achieved, wherein the probability of failure of the magnetic rotor device and / or the side channel compressor can be reduced.

[0021] In a particularly advantageous extension of the method, it is provided that at least one screw element is screwed into the third recess of the hub until a longitudinal expansion of the screw element is obtained, wherein the screw element and its enlarged head abut against the end face of the loop in the direction of the rotation axis, so that the loop is fixed to the hub in a force-locking and / or friction-locking and / or form-locking manner.

[0022] The invention is not limited to the embodiments described herein and the aspects emphasized therein. On the contrary, numerous variations are possible within the scope of the invention as described by the claims and within the purview of a person skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in more detail below with reference to the accompanying drawings.

[0024] The accompanying drawings show:

[0025] Figure 1 : A schematic cross-sectional view of a side channel compressor according to the present invention,

[0026] Figure 2: A schematic cross-sectional view of a magnetic rotor arrangement having a compressor wheel, a hub, a return ring and at least one bearing,

[0027] Figure 3 : A perspective top view of a rotor assembly according to the invention according to an exemplary embodiment, the rotor assembly having a loop with four protrusions and four corresponding segment magnets,

[0028] Figure 4 : A three-dimensional cross-sectional view of a rotor assembly with a closing plate according to the present invention,

[0029] Figure 5 : A cross-sectional view of a rotor assembly according to the present invention according to the prior art,

[0030] Figure 6 : Schematic cross-sectional view of a magnetic rotor arrangement with a pin or screw element, a hub and a ring. DETAILED DESCRIPTION

[0031] From the basis Figure 1 A schematic sectional view of a side channel compressor 1 according to the invention can be seen in the illustration of FIG.

[0032] Here, in Figure 1 , a side channel compressor for a fuel cell system 31 for conveying and / or compressing a gaseous medium, in particular hydrogen, is shown, the side channel compressor being provided with a housing 3 and a drive device 6, wherein the housing 3 has a housing upper part 7 and a housing lower part 8. The housing 3 also has a compressor chamber 30 extending circumferentially around an axis of rotation 4, the compressor chamber having at least one circumferential side channel 19, 21, and a magnetic rotor device 2 located in the housing 3, which is arranged rotatably around the axis of rotation 4 and is driven by the drive device 6, wherein the magnetic rotor device 2 has blades 5 arranged on its circumference in the region of the compressor chamber 30, and each having a gas inlet opening 14 and a gas outlet opening 16 formed on the housing 3, which are fluidically connected to one another via the compressor chamber 30, in particular via at least one side channel 19, 21, wherein the side channel compressor 1 has at least one bearing 27, 47. Here, the at least one side channel 19, 21 can extend circumferentially around the axis of rotation 4 at least in a partial region of the housing 3, wherein an interruption region 15 is formed in a partial region in which the at least one side channel 19, 21 in the housing 3 is not formed.

[0033] In addition, Figure 1, the drive device 6 is designed as an axial field motor 6, which has a stator 11 and a rotor component 17, wherein the stator 11 and the rotor component 17 are designed to be disk-shaped around the rotation axis 4, wherein the stator 11 is arranged next to the rotor component 17 in the direction of the rotation axis 4. In this case, the rotor component 17 can be located at least indirectly on or in the hub 23 of the magnetic rotor device 2. In addition, Figure 1 , it is shown that the side channel compressor 1 has a stator chamber 48 and a rotor chamber 46, wherein components of the drive device 6 are at least partially arranged in these chambers 46, 48. Here, the housing upper part 7 has a continuous wall 29, which is located between the stator chamber 48 and the rotor chamber 46 and realizes the fluid separation. In addition, the stator chamber 48 is at least partially surrounded and / or encapsulated by the stator housing 39. Here, the housing lower part 8 has a cylindrical bearing journal 12, wherein the bearing journal 12 extends in the direction of the rotation axis 4 so that its circumference extends around the rotation axis 4, wherein the first bearing 27 and / or the second bearing 47 are in contact with the circumference of the bearing journal 12 radially relative to the rotation axis 4. Here, the drive device 6 can be implemented as an axial field motor 6, which has a stator 11 and a rotor component 17, wherein the stator 11 is arranged next to the rotor component 17 in the direction of the rotation axis 4. Furthermore, the side channel compressor 1 has a cylindrical bearing journal 12, wherein the bearing journal 12 extends in the direction of the rotation axis 4 so that its circumference extends circumferentially around the rotation axis 4. In this case, the first bearing 27 and / or the second bearing 47 are in contact with the circumference of the bearing journal 12 radially relative to the rotation axis 4.

[0034] exist Figure 2 , a schematic sectional view of a magnetic rotor device 2 with a compressor wheel 10, a hub 9, a return ring 22 and at least one bearing 27, 47 is shown. The magnetic rotor device 2 shown here is a component of a side channel compressor 1 for a fuel cell system 31 for conveying and / or compressing a gaseous medium, in particular hydrogen. Here, the magnetic rotor device 2 can be located at least almost completely in a rotor chamber 46 and can be mounted rotatably about an axis of rotation 4 and can be driven by means of a drive device 6. Here, the magnetic rotor device 2 has a compressor wheel 10, by means of which a gas flow can be generated in particular in the compressor chamber 30. In addition, the magnetic rotor device 2 has a hub 9, a return ring 22 and at least one bearing 27, 47.

[0035] also, Figure 2It is shown that the hub 9 has a groove 13 which extends annularly around the rotation axis 4 and can be enclosed by a rotor chamber 46, wherein the components of the ring 22 and at least two segment magnets 24, ideally four segment magnets 24, are at least almost completely located in the groove 13. However, in other exemplary embodiments, six or more segment magnets 24 can also be located in the groove 13. A spacer disk 37 can be located between the first bearing 27 and the second bearing 47 in the direction of the rotation axis 4, wherein the distance between the bearings, in particular in the direction of the rotation axis 4, can be adjusted by means of the spacer disk 37.

[0036] like Figure 2 , the rotor assembly 17 is connected to the compressor wheel 10 by means of at least one spring disk 33 and at least one bolt 35. The groove 13 extends in a disk-shaped manner orthogonal to the rotation axis 4 and is delimited on its side facing away from the rotation axis 4 by a circumferential cylindrical flange 32 of the hub and on its side facing the rotation axis 4 by a circumferential cylindrical shoulder 34 of the hub 9. Here, the hub 9 forms a cylindrical flange 32 on its outer diameter facing away from the rotation axis 4 and a cylindrical shoulder 34 on its inner diameter facing the rotation axis 4. In addition, a bearing hole 36 with a bearing seat 45 is located within the inner diameter and / or the cylindrical shoulder 34.

[0037] Figure 2 It is shown that the groove 13 is open on its side facing the stator 11, in particular in the direction of the rotation axis 4. In an exemplary embodiment of the side channel compressor 1, the groove 13 is open toward the stator 11, wherein the groove 13 can be closed and / or encapsulated by means of a closing plate 26. In this case, the closing plate 26 is mounted on the end face of the hub 9 facing the stator 11, wherein the closing plate 26 is non-magnetic and can be mounted on the hub 9 by means of at least one laser weld 38. In this case, the hub 9 and / or the return ring 22 and / or the segment magnets 24 and / or the spring disk 33 and / or the bolts 35 form the rotor component 17.

[0038] exist Figure 2The magnetic rotor arrangement 2 shown in FIG. 1 can have a variety of materials. In an exemplary embodiment of the magnetic rotor arrangement 2, the hub 9 can have an austenitic stainless steel, in particular X2CrNiMo17-12-2 (1.4404), and the ring 22 can have an unalloyed structural steel, in particular S235JR and / or St37 and / or St52 and / or a magnetic free-cutting steel, in particular 11SMn30. For example, the segment magnets 24 can have NdFeB and the closing plate 26 can have an austenitic stainless steel, in particular X2CrNi 17-12-2 (1.4404). Furthermore, the compressor wheel 10, which can have aluminum and / or plastic and has a stepped profile, is pushed onto the hub 9 in the direction of the rotation axis 4 before these components, the hub 9 and the compressor wheel 10, are brought into contact with their stepped shoulders and then screwed together by means of at least one spring disk 33 and at least one screw 35.

[0039] In one exemplary embodiment, after this assembly step, the magnetic rotor arrangement 2 is balanced in order to keep the centrifugal forces low during operation. In this process, material is removed at defined areas of the compressor wheel 10 and / or the hub 9. Finally, after balancing, the bearings 27, 47 and the spacer disks 37 are pressed in via the outer diameter. In an alternative embodiment, balancing can also be performed as the last processing step.

[0040] Figure 3 A schematic top view of a hub 9 according to the invention is shown according to an exemplary embodiment, the hub having a ring 22 with four projections 25 and four corresponding segment magnets 24. It is shown here that the hub 9 has a shoulder 34 on its inner diameter facing the axis of rotation 4, which extends around the axis of rotation 4, and the hub 9 has a flange 34 on its outer diameter facing away from the axis of rotation 4, which extends around the axis of rotation 4. The ring 22 is inserted and / or pressed into a recess 13 of the hub 9, wherein the ring 22 is already installed in the hub 9 as a preassembled rotor assembly 17 with the ring 22 and the segment magnets 24. In this case, in an exemplary embodiment of the magnetic rotor device 2, the ring 22 has a first projection 25a, a second projection 25b, a third projection 25c and a fourth projection 25d, which extend in particular in the direction of the axis of rotation 4. In alternative embodiments, the ring 22 can have at least two projections 25 or more projections 25. In this case, a segment magnet 24 is located in each case in the intermediate space between two projections 25 around the axis of rotation 4. In the exemplary embodiment of the magnetic rotor arrangement 2, the magnetic rotor arrangement has a first segment magnet 24a, a second segment magnet 24b, a third segment magnet 24c and a fourth segment magnet 24d.

[0041] Here, two opposite segment magnets 24 are each configured as north poles and two opposite segment magnets 24 are configured as south poles, so that on a circular orbit, there are always segment magnets 24 that are north poles and south poles that alternate on a circular orbit that extends around the axis of rotation 4. These segment magnets 24 configured as circular segments can be an even number of magnetizable segment magnets 24, which are placed on one side of the hub 9. There are projections 25 between the circular segments 24, which can separate the segment magnets 24 laterally (in a radial loop). In the magnetic rotor device 2, the segment magnets 24 must be fixed in order to transmit the torque of the drive device 6 and optionally the axial magnetic force. This function is assumed by the loop 22 that is fixedly connected to the hub 9.

[0042] Figure 4 A three-dimensional cross-sectional view of a rotor assembly 17 according to the invention comprising a closing plate 26 is shown. It is shown here that in this exemplary embodiment of the magnetic rotor device 2, the closing plate 26 is mounted on the flange 32 and the shoulder 34 by means of a material-locking method, in particular laser welding, so that the recess 13 is encapsulated, in particular hermetically sealed. The recess 13 open to the stator 11 is thus closed and / or encapsulated by means of the closing plate 26. Here, the corresponding laser weld 38 in the flange 32 and / or in the shoulder 34 can be formed by a plurality of point-shaped laser welds 38 surrounding the rotation axis 4, which extend from the closing plate 26 to the hub 9 in a pin-shaped manner. However, this can also be a corresponding weld that continuously surrounds the rotation axis 4 in the flange 32 and / or in the shoulder 34 in an annular manner.

[0043] Figure 5 A schematic cross-sectional view of a rotor assembly 17 according to the invention according to the prior art is shown. Here, the ring 22 is pressed into the hub 9 in the region of the surface 40. This pressure can deform the bearing opening 36. The subsequent assembly of the corresponding bearing 27, 47, in particular the ball bearing 27, 47, can only be very difficult due to the deformation of the surface region and the bearing 27, 47 can be damaged, so that the failure probability of the bearing 27, 47 and therefore the failure probability of the entire side channel compressor 1 is increased.

[0044] exist Figure 6, a schematic sectional view of a rotor arrangement 2 according to a first embodiment is shown. It is shown here that the ring 22 is connected to the hub 9 by means of at least one pin 42 and / or a screw element 44. The pin 42 and / or the screw element 44 can be located between the outer diameter of the ring 22 and the first center axis 51 of the threaded hole 49 of the hub 9. It is also shown that the hub 9 has a bearing seat 45 in the form of a bearing hole 36 on its inner diameter, wherein the first bearing 27 and / or the second bearing 47 are located in this area. In this case, the respective bearing 27, 47 has a bearing outer ring 43 and a bearing inner ring 41, wherein the respective bearing 27, 47 is pressed into the bearing hole 36 of the hub 9 with the outer diameter of the bearing outer ring 43.

[0045] also, Figure 6 It is shown that the respective pin 42 and / or the respective screw element 44 has a body 54. Optionally, the respective pin 42 and / or the respective screw element 44 can have a head 52, wherein the head 52 can have a larger diameter than the body 54. In this case, in particular after successful assembly, the respective pin 42 and / or the respective screw element 44 is located with the head 52 in the first recess 41 of the loop 22 and with the body 54 in the second recess 43 of the loop 22 and in the third recess 45 of the hub 9. In an exemplary embodiment of the magnetic rotor device 2, the body 54 of the respective pin 42 has a larger diameter than the respective third recess 45, so that a force-fitting and / or friction-fitting connection, in particular a press fit, is formed between the respective pin 42 and / or the hub 9.

[0046] Here, in Figure 6 , the corresponding pin 42 and / or the corresponding screw element 44 are located in the distal region of the first center axis 51 of the threaded hole 49 and the axis of rotation 4. Here, the corresponding pin 42 and / or the corresponding screw element 44 extend or are positioned at least approximately parallel to the axis of rotation 4. Here, the corresponding pin 42 and / or the corresponding screw element 44 extend rotationally symmetrically around the second center axis 53. Here, the second center axis 53 can extend at least approximately parallel to the axis of rotation 4 and / or parallel to the center axis 51. Here, the third recess 45 in the hub 9 has a thread 18, in particular an internal thread 18, and the corresponding screw element 44 has a thread 28, in particular an external thread 28, in the region of the body 54, wherein the screw element 44 and the hub 9 are screwed together.

[0047] like Figure 6As shown, the fixing of the ring 22 can be established by means of corresponding pins 42 and / or corresponding screw elements 44 without deforming the bearing hole 36 and / or the bearing seat 45 of the hub 9. The bearing hole 36 serves as the bearing seat 45 and therefore has very narrow tolerance requirements. In this case, the hub 9 is made of soft, non-magnetic, weldable austenitic stainless steel. The reason for this and the very small wall thickness in the area of ​​the surrounding cylindrical shoulder 34 is that, with a high rigidity of the pressed-in ring 22, Figure 5 The bearing hole 36 in the illustrated prior art can deform. Therefore, by means of the configuration according to the invention of the magnetic rotor device 2, which has a corresponding pin 42 and / or a corresponding screw element 44, a deformation of the bearing hole 36 and / or the bearing seat 45 is prevented, which deformation leads to a greatly reduced bearing clearance when pressing in the corresponding bearing 27, 47, which has a negative impact on the bearing life in the temperature process (especially at low temperatures). In this case, the corresponding pin 42 and / or the corresponding screw element 44 are as far away from the bearing seat 45 as possible, so that at least almost no deformation of the bearing seat 45 can be expected by introducing the pin 42 and / or the screw element 44. Therefore, due to the configuration according to the invention of the magnetic rotor device 2, after the rotor assembly 17 is assembled, it is no longer necessary to grind the bearing hole 36 in a complex manner. The object of the present invention is to design a connection which does not deform the bearing hole 36 after assembly and does not require subsequent grinding of the bearing hole 36, which reduces the cost of the individual components. The resulting advantages are an increased service life of the bearings 27 , 47 and a simpler and more cost-effective production of the magnetic rotor arrangement 2 , since complex grinding processes are dispensed with.

[0048] Here, if Figure 6 As shown, a manufacturing process and / or method for manufacturing a magnetic rotor device 2 can be applied to a side channel compressor 1 and / or a fuel cell system 31. The manufacturing process or method can be used to construct a magnetic rotor device 2 by the following steps:

[0049] - providing a loop 22, wherein the loop 22 has at least two projections 25, between which a segment magnet 24 is respectively mounted,

[0050] - installing or inserting the ring 22 into the groove 13 of the hub 9 in the direction of the axis of rotation 4, wherein the ring 22 is fixed to the hub 9 by means of at least one pin 42 and / or a screw element 44, in particular in a form-fitting or force-fitting manner,

[0051] - connecting the corresponding segment magnets 24 to the loop 22, in particular to the end face of the loop 22 and / or to the corresponding projections 25, by means of a form-fitting, material-locking or force-locking method, to form the rotor component 17,

[0052] Furthermore, in the method, the at least one pin 42 is pressed with its body 54 into the third recess 45 in such a way that a non-positive and / or non-positive connection is formed between the respective pin 42 and the hub 9. In this way, the loop 22 and / or the rotor assembly 17 are fixed to the hub 9. Furthermore, a method is required in which at least one screw element 44 is screwed into the third recess 45 of the hub 9 until a longitudinal expansion of the screw element 44 is obtained. In this way, the screw element 44 rests with its enlarged head 52 against the end face of the loop 22 in the direction of the axis of rotation, so that the loop 22 is fixed to the hub 9 in a non-positive and / or non-positive and / or positive manner.

Claims

1. A magnetic rotor arrangement (2) for a side channel compressor (1) of a fuel cell system (31), the side channel compressor being used for conveying and / or compressing a gaseous medium, in particular hydrogen, wherein: The magnetic rotor device (2) is mounted rotatably about an axis of rotation (4) and / or can be driven by means of a drive device (6), wherein the magnetic rotor device (2) has a compressor wheel (10), a hub (9), a return ring (22) and at least one bearing (27, 47), by means of which an air flow can be generated in particular in a compressor chamber (30), characterized in that the hub (9) has a groove (13) which extends annularly about the axis of rotation (4) and can be enclosed by the rotor chamber (46), wherein the return ring (22) and at least two segment magnets (24), ideally four segment magnets (24) are at least almost completely located in the groove (13), wherein the return ring (22) is connected to the hub (9) by means of at least one pin (42) and / or a screw element (44).

2. The magnetic rotor device (2) according to claim 1, characterized in that The corresponding pin (42) and / or the corresponding screw element (44) has a body (54). Here, the corresponding pin (42) and / or the corresponding screw element (44) optionally has a head (52), wherein the head (52) has a larger diameter than the body (54).

3. The magnetic rotor device (2) according to claim 2, characterized in that The corresponding pin (42) and / or the corresponding screw element (44) is located with the head (52) in the first recess (41) of the loop (22) and with the body (54) in the second recess (43) of the loop (22) and in the third recess (45) of the hub (9).

4. The magnetic rotor device (2) according to claim 3, characterized in that The body (54) of the respective pin (42) has a larger diameter than the respective third recess (45), so that a force-fitting and / or friction-fitting connection, in particular a press fit, is formed between the respective pin (42) and / or the hub (9).

5. The magnetic rotor device (2) according to claim 3, characterized in that The third recess (45) in the hub (9) has a thread (18), in particular an internal thread (18), and the corresponding screw element (44) has a thread (28), in particular an external thread (28), in the region of the body (54), wherein the screw element (44) and the hub (9) are screwed together.

6. The magnetic rotor device (2) according to any one of the preceding claims, characterized in that The respective pin (42) and / or the respective screw element (44) extends or is positioned at least approximately parallel to the rotation axis (4).

7. The magnetic rotor device (2) according to any one of claims 1 to 3, characterized in that The corresponding pin (42) and / or the corresponding screw element (44) are located in the distal region of the first center axis (51) of the threaded hole (49) and the rotation axis (4).

8. A side channel compressor (1) having a stator (11) and a magnetic rotor arrangement (2) according to any one of claims 1 to 7.

9. A fuel cell system (31) comprising a side channel compressor (1) according to claim 8, wherein: The side channel compressor (1) is arranged in the anode circuit of the fuel cell system (31).

10. A method for producing a magnetic rotor arrangement (2) for a side channel compressor (1) and / or a fuel cell system (31) according to any of the preceding claims, the method comprising the following steps: - providing a loop (22) in which: The loop (22) has at least two protrusions (25), between which a segment magnet (24) can be mounted. - installing or inserting the loop 22 into the groove (13) of the hub (9) in the direction of the axis of rotation (4), wherein the loop (22) is fixed to the hub (9) by means of at least one pin (42) and / or a screw element (44), in particular in a form-fitting or force-fitting manner, - Connecting the corresponding segment magnets (24) to the loop (22), in particular to the end face of the loop (22) and / or to the corresponding projections (25), by means of a form-fitting, material-locking or force-locking method, to form a rotor component (17).

11. A method according to claim 10, in which at least one pin (42) is pressed into the third recess (45) with the body (54) of the pin, so that a force-locking and / or friction-locking connection is formed between the corresponding pin (42) and the hub (9) and the ring (22) and / or the rotor assembly (17) are thus fixed to the hub (9).

12. A method according to claim 10, in which the at least one screw element (44) is screwed into the third recess (45) of the hub (9) until a longitudinal expansion of the screw element (44) is obtained, and the screw element with its enlarged head (52) abuts against the end face of the loop (22) along the direction of the rotation axis, so that the loop (22) is fixed to the hub (9) in a force-locking and / or friction-locking and / or form-locking manner.

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