DE102019220003A1 - Side channel compressor for a fuel cell system for conveying and / or compressing a gaseous medium - Google Patents

Abstract

Side channel compressor (1) for a fuel cell system (31) for conveying and / or compressing a gaseous medium, in particular hydrogen, with a housing (3), with a compressor wheel (2) located in the housing (3), which is rotatable about an axis of rotation ( 4) is arranged and driven at least indirectly by a drive (6), the compressor wheel (2) having delivery cells (5) arranged on its circumference in the region of a compressor chamber (30), and each with a gas pump formed on the housing (3) Inlet opening (14) and a gas outlet opening (16), which are fluidically connected to one another via the compression chamber (30), in particular the at least one side channel (19, 21), with a first and / or second axis of symmetry (26, 28) , in particular the flow contour, of the compressor wheel (2) run orthogonally to the axis of rotation (4) and the respective side channel (19, 21) at least fluidically delimiting each other between the housing (3) and the compressor wheel (2) in functionally relevant gap (32, 34, 36, 38) between the housing (3) and the compressor wheel (2). According to the invention, the drive (6) has a stator (11) and a rotor (17), the stator ( 12) and / or the rotor (17) are arranged along the first and / or second axis of symmetry (26, 28).

Description

The present invention relates to a side channel compressor for a fuel cell system for conveying and / or compressing a gaseous medium, in particular hydrogen, which is provided in particular for use in vehicles with a fuel cell drive.

In addition to liquid fuels, gaseous fuels will also play an increasing role in the vehicle sector in the future. Hydrogen gas flows must be controlled, especially in vehicles with fuel cell drives. The gas flows are no longer controlled discontinuously, as is the case with the injection of liquid fuel, but the gaseous medium is taken from at least one high-pressure tank and fed to an ejector unit via an inflow line of a medium-pressure line system. This ejector unit leads the gaseous medium to a fuel cell via a connecting line of a low-pressure line system. After the gaseous medium has flowed through the fuel cell, it is returned to the ejector unit via a return line. The side channel compressor can be interposed, which supports the gas recirculation in terms of flow and efficiency. In addition, side channel compressors are used to support the flow build-up in the fuel cell drive, in particular when the vehicle is (cold) started after a certain idle time. These side channel blowers are usually driven by electric motors, which are supplied with voltage from the vehicle battery when they are operated in vehicles.

From the DE 10 2010 035 039 A1 a side channel compressor for a fuel cell system is known in which a gaseous medium, in particular hydrogen, is conveyed and / or compressed. The side channel compressor has a housing and a drive, the housing having an upper housing part and a lower housing part. Furthermore, a compressor chamber which runs circumferentially around an axis of rotation and has at least one circumferential side channel is arranged in the housing. In the housing there is a compressor wheel which is arranged rotatably about the axis of rotation and is driven by the drive, the compressor wheel having impeller blades arranged on its circumference in the area of the compressor chamber. In addition, the from the DE 10 2010 035 039 A1 Known side channel compressors each have a gas inlet opening formed on the housing and a gas outlet opening, which are fluidically connected to one another via the compressor chamber, in particular the at least one side channel. In this case, the side channel compressor has the drive which has a stator which runs in the form of a sleeve around the axis of rotation and in the interior of which a rotor arranged on a rotor shaft is arranged. The rotor shaft is supported by means of two ball bearings each arranged axially to the end faces of the rotor. The one from the DE 10 2010 035 039 A1 known side channel blowers can use the stator as a heating element.

The one from the DE 10 2010 035 039 known side channel blowers can have certain disadvantages.

On the one hand, the compressor wheel is disc-shaped and has a large diameter radially to the axis of rotation and thus requires a lot of installation space radially to the axis of rotation, while the compressor wheel is made narrow axially to the axis of rotation and thus requires little installation space radially to the axis of rotation. On the other hand, however, the drive shown with the stator arranged outside the rotor has a small diameter radially to the axis of rotation and thus requires little installation space radially to the axis of rotation. However, due to the arrangement of the stator and rotor, the drive requires a lot of installation space axially to the axis of rotation. Due to these contradicting space requirements of the drive and the compressor wheel, a combination and / or assembly of the two components results in a bulky and space-consuming overall system of the side channel compressor that cannot be implemented in a compact design. Furthermore, the from the DE 10 2010 035 039 Known side channel blowers have the disadvantage that the thermal energy when the stator is controlled and / or used as a heating element, the thermal energy has to cover a long way over a large number of components before it can penetrate to the area in which the moving parts cross over ice bridges can freeze on. A lot of energy is lost through heat losses, since a large area is charged with thermal energy in which no ice bridges can form and / or in which there are no moving parts.

Disclosure of the invention

Advantages of the invention

According to the invention, a side channel compressor for a fuel cell system for conveying and / or compressing a gaseous medium, in particular hydrogen, with the features of the independent claims is provided.

Referring to claim 1, the side channel compressor has a drive with a stator and a rotor, the stator and / or the rotor along a first and / or second axis of symmetry, in particular the compressor wheel, are arranged. In this way it can be achieved that the drive can be implemented as a component that is narrow in the direction of the axis of rotation and has a small diameter. The installation space of the drive in the side channel compressor can thus be reduced, but also the total installation space required for the side channel compressor in the overall vehicle.

Furthermore, such an embodiment of the drive according to the invention allows a similar installation space to the side channel compressor to be achieved, with both components, the drive and the side channel compressor now being constructed relatively narrow, but with a large diameter. This is especially true in comparison to the prior art, in which the drive is relatively wide, but only has a small diameter, whereas the side channel compressor is relatively narrow, but has a relatively large diameter. Due to the design of the drive according to the invention, a compact and space-saving integration of the drive and side channel compressor components can be achieved. The compact and space-saving design of the side channel blower is achieved through the smallest possible surface area in relation to the volume. Furthermore, the compact design of the side channel compressor and / or the drive, in particular with the smallest possible surface area in relation to the volume, offers the advantage that the side channel compressor and / or the drive can cool down at low ambient temperatures, in particular in the range below 0 ° C , takes place more slowly and thus the occurrence of ice bridge formation can be delayed longer.

The measures listed in the subclaims allow advantageous developments of the side channel compressor specified in claim 1. The subclaims relate to preferred developments of the invention.

According to an advantageous embodiment of the side channel compressor, the stator and / or the rotor are arranged in an area of the compressor wheel facing away from an axis of rotation, in particular outside an outer diameter of the compressor wheel, with the rotor and / or a receiving ring of the rotor in the area of a first or second functionally relevant gap are located, the receiving ring running around the axis of rotation in the shape of a sleeve. In this way, the heat loss that occurs when the drive is electrically powered in the stator and / or rotor can be used more efficiently in order to be able to thaw and thus dissipate ice bridges that are in the area of the first and / or second functionally relevant gap more quickly. Such ice bridges can make starting, in particular a cold start, of the fuel cell system, in particular of the side channel compressor, more difficult and / or completely prevent it. When starting the vehicle and thus the fuel cell system, this can also lead to a blockage of the drive if the ice bridge is too large, which can damage the rotating parts, in particular the compressor wheel, and / or make starting the system difficult or delayed or completely prevented. In addition, flaking ice crystals from the ice bridges in a stack of the fuel cell system can damage a membrane. Due to the design of the side channel compressor and / or the drive according to the invention, the stator and / or the rotor can be arranged closer and / or directly in the immediate vicinity of the respective first and / or second gap. In this way, a cold start procedure for the side channel blower can be accelerated, especially at temperatures below 0 ° C, and / or the ice bridges can be defrosted and removed more sustainably and more quickly, making the entire vehicle operational and ready to drive faster and thereby improving the service life of the side channel blower and the entire fuel cell system as damaging ice bridges can be removed faster and more efficiently.

According to an advantageous development of the side channel compressor, the stator and / or the rotor are arranged in an area between the axis of rotation and the compressor wheel, in particular an inner diameter of the compressor wheel. The rotor and / or a receiving ring of the rotor are located in the area of a third or fourth function-relevant gap, the receiving ring running around the axis of rotation in the form of a sleeve. In this way, the heat loss that occurs when the drive is electrically powered in the stator and / or rotor can be used more efficiently in order to thaw and thus dissipate ice bridges that are in the area of the third and / or fourth function-relevant gap more quickly. Due to the design of the side channel compressor and / or the drive according to the invention, the stator and / or the rotor can be arranged closer and / or directly in the immediate vicinity of the respective third and / or fourth gap. In this way, a cold start procedure for the side channel blower can be accelerated, especially at temperatures below 0 ° C, and / or the ice bridges can be defrosted and removed more sustainably and more quickly, making the entire vehicle ready for use and ready to drive more quickly and thereby improving the service life of the side channel blower and the entire fuel cell system as damaging ice bridges can be removed faster and more efficiently.

According to an advantageous further development of the side channel compressor, the stator is designed in the shape of a sleeve around the axis of rotation. On in this way the advantage can be achieved that a compact arrangement of the stator in the side channel compressor can be achieved. Furthermore, this embodiment offers the advantage that the drive requires less electrical energy to drive the compressor wheel, whereby the operating costs of the side channel compressor and thus of the fuel cell system can be reduced.

According to a particularly advantageous embodiment of the side channel compressor, the rotor has several rotor plates which are arranged circumferentially around the axis of rotation, the rotor plates being connected in particular positively and / or non-positively and / or one materially to the receiving ring and / or the compressor wheel. On the one hand, this offers advantages in the assembly of the rotor, since the rotor, in particular the rotor plates, can be preassembled on the mounting ring, whereby the assembly time and the assembly costs as well as a possible repair time and repair costs in the case of the necessary replacement of the rotor can be reduced. This offers the advantage of reduced manufacturing costs and reduced operating costs for the side channel blower. In addition, such an arrangement of the rotor plates offers the advantage that the rotor plates are mounted at a short distance from one another and therefore there is no damage to the sensitive rotor plates, which are in particular designed as magnetic plates, when passing through a large temperature range due to internal stress and / or different thermal expansion coefficients of the rotor and the receiving ring. In this way, the service life of the side channel blower can be increased.

According to an advantageous development of the side channel compressor, the receiving ring, in particular the material of the receiving ring, has a high thermal conductivity and / or a high inductive resistance. In this way, the advantage can be achieved that the receiving ring can be heated either due to thermal radiation generated by the drive or by an inductive current supply and / or a magnetic field, whereby a faster heating of the side channel compressor, in particular in the area of the first, second, third and / or fourth function-relevant gap. In this way, a cold start procedure for the side channel blower can be accelerated, especially at temperatures below 0 ° C, and / or the ice bridges can be defrosted and removed more sustainably and more quickly, making the entire vehicle ready for use and ready to drive more quickly and thereby improving the service life of the side channel blower and the entire fuel cell system as damaging ice bridges can be removed faster and more efficiently.

According to a particularly advantageous development, the receiving ring has, on its end faces running axially to the axis of rotation, an inner flange running disc-shaped around the axis of rotation, this respective inner flange forming a surface on the compressor wheel side running radially to the axis of rotation in the area of the first or second gap. This inventive embodiment of the receiving ring also extends geometrically into the area of the first, second, third and / or fourth function-relevant gap, which enables faster and more efficient heat transfer in this area and which creates ice bridges in this area, in particular in the case of a cold start procedure for the vehicle, defrost and dispose of it more quickly. In addition, the service life of the assembly assembly of the compressor wheel with the receiving ring can be increased in this way.

According to an advantageous development, there is at least one first intermediate disk and / or at least one second intermediate disk in the housing, in particular in the area of the end faces of the housing facing the gaps, the intermediate disks each running in a disk-shaped manner around the axis of rotation. The material of the intermediate disks can have a higher thermal conductivity and / or a higher strength compared to the material of the rest of the housing. On the one hand, this offers the advantage that faster and more efficient heat transfer can be achieved in the area of the functionally relevant gaps, which means that ice bridges that occur in these areas can be thawed and removed more quickly, especially when the vehicle is cold-started. On the other hand, due to the material properties of the intermediate disks, damage to the side channel compressor, for example by abrasive particles, can be reduced due to the service life, whereby the service life of the side channel compressor can be improved.

According to a particularly advantageous development of the side channel compressor, a spacer sleeve is located axially to the axis of rotation between the upper housing part and the lower housing part and / or is in contact with these axially to the axis of rotation. In this way, the advantage can be achieved that the stator space can be encapsulated without the need for additional components, such as a stator housing, for example. In addition, assembly errors can be reduced, for example due to housing parts that are not optimally aligned with one another, whereby the probability of failure of the side channel compressor can be reduced. Furthermore, by using the spacer sleeve, it is possible to compensate for manufacturing tolerances of the upper housing part and / or the lower housing part in such a way that the Width of the functionally relevant gap and / or the distance axially to the axis of rotation of the compressor wheel to the housing upper part and / or housing lower part can be adjusted by means of the spacer sleeve. In this case, spacer sleeves with different thicknesses running in the direction of the axis of rotation can either be used during assembly, or spacer sleeves can be machined shortly before or during the assembly process. It is no longer necessary to rework the upper part of the housing and / or the lower part of the housing. In this way, the assembly time and / or the assembly costs can be reduced.

According to an advantageous method for starting or switching off the side channel compressor, the stator is energized without a rotating field building up between the stator and the rotor and thus no or very little rotational movement of the rotor about the axis of rotation occurs. In this case, the stator is warmed up when the coils of the stator are briefly energized, in particular due to the resulting power loss, which is released as thermal energy. This thermal energy then spreads from the stator to the other components of the side channel compressor. In addition, in a further possible embodiment, the stator can be energized by means of an advantageous method in such a way that inductive heating of the rotor takes place, with thermal energy being transferred in particular from the rotor to the compressor wheel and with the heat from the rotor in a flow direction in the Spreads area of the axial ends of the inner limiting ring and the at least one outer annular collar of the compressor wheel. In this way, the advantage can be achieved that the energization of the stator causes the rotor to heat up when there is no rotating field, the effect of induction being used in particular for this purpose. The rotor, which consists in particular of a thermally conductive material, can be heated, which is particularly advantageous in the case of a cold start procedure for the side channel compressor and / or the vehicle. The rotor heats up and transfers the thermal energy to the compressor wheel, for example due to its thermal conductivity. The heat energy transfer takes place in one flow direction in the area between the compressor wheel and the housing in which ice bridges have formed. These ice bridges arise due to an existing liquid, in particular water, which forms during operation of the fuel cell system and which collects in particular in the area with a small gap between the compressor wheel and the housing. When the side channel compressor and / or the vehicle are switched off, in particular over a longer period of time and / or at low ambient temperatures below freezing point, the liquid freezes and ice bridges are formed. These ice bridges can damage the side channel blower when the side channel blower is started up and / or prevent rotation of the compressor wheel in the housing by blocking. Furthermore, when the compressor wheel starts up, it can break away, releasing sharp-edged pieces of ice that can damage components behind the side channel compressor and / or a fuel cell, in particular the membrane of the fuel cell, in the conveying direction. As a result of the heating of the rotor, the compressor wheel and in particular the area of the inner limiting ring and the outer annular collar, which both form a small distance, in particular a small gap, to the housing, are heated. As a result, the ice bridges melt and the liquid changes from a solid to a liquid aggregate state and can be discharged, for example by means of a purge valve and / or drain valve present in the fuel cell system. In this way, the service life of the side channel compressor and / or the fuel cell system can be increased.

The invention is not restricted to the exemplary embodiments described here and the aspects emphasized therein. Rather, a large number of modifications are possible within the range specified by the claims, which are within the scope of expert action.

Brief description of the drawing

The invention is described in more detail below with reference to the drawing.

• 1 eine schematische Schnittansicht eines erfindungsgemäßen Seitenkanalverdichters gemäß einem ersten Ausführungsbeispiel,
• 2 einen in 1 mit A-A bezeichneten Schnitt des Seitenkanalverdichters in vergrößerter Darstellung,
• 3 eine schematische Schnittansicht eines erfindungsgemäßen Seitenkanalverdichters gemäß einem zweiten Ausführungsbeispiel,
• 4 eine schematische Schnittansicht eines erfindungsgemäßen Seitenkanalverdichters gemäß einem dritten Ausführungsbeispiel.

It shows:

• 1 a schematic sectional view of a side channel compressor according to the invention according to a first embodiment,
• 2 one in 1 Section of the side channel compressor marked with AA in an enlarged view,
• 3 a schematic sectional view of a side channel compressor according to the invention according to a second embodiment,
• 4th a schematic sectional view of a side channel compressor according to the invention according to a third embodiment.

Description of the embodiment

According to the representation 1 is a schematic sectional view of a side channel blower according to the invention 1 according to a first embodiment.

In 1 shown that the side channel blower 1 a housing 3 having, being in the housing 3 a compressor wheel 2 is located, which is rotatable about an axis of rotation 4th arranged and at least indirectly by a drive 6th is driven. The compressor wheel 2 on its circumference in the area of a compression chamber 30th arranged conveyor cells 5 on. In addition, the housing 3 a gas inlet port 14th and a gas outlet port 16 on that via the compressor room 30th , in particular the at least one side channel 19th , 21 are fluidically connected to each other. Here is the side channel blower 1 by means of the gas inlet opening 14th and / or the gas outlet opening 16 with a fuel cell system 31 connected, the side channel blower 1 in particular as a component of an anode circuit of the fuel cell system 31 is used. The side channels 19th , 21 run in this way in the housing 3 in the direction of the axis of rotation 4th that this is axially to the delivery cell 5 run on both sides. The side channels 19th , 21 can at least in a partial area of the housing 3 all around the axis of rotation 4th run, in the sub-area in which the side channels 19th , 21 in the housing 3 is not formed, a breaker area in the housing 3 is trained.

Furthermore, in 1 shown that a first axis of symmetry 26th , in particular the flow contour of the compressor wheel 2 orthogonal to the axis of rotation 4th runs. Another not shown (in 2 shown) second axis of symmetry 25th orthogonal to the first axis of symmetry 26th and to axis of rotation 4th , where the first axis of symmetry 25th and the second axis of symmetry 26th one orthogonal to the axis of rotation 4th running normal plane 25th train (shown in 2 ). In the area between the housing 3 and the compressor wheel 2 becomes the first side channel 19th on the axis of rotation 4th remote side through a first functionally relevant gap 32 at least fluidly limited, the gap 32 by such a small distance between the housing 3 , in particular a housing upper part 7th , and the compressor wheel 2 is formed and wherein the first gap 32 disc-shaped circumferentially around the axis of rotation 4th runs. Another functionally relevant gap 34 delimits the second side channel 21 on the axis of rotation 4th remote side, the second gap 34 by such a small distance between the housing 3 , in particular a housing lower part 8th , and the compressor wheel 2 is trained. Furthermore, there is an at least fluidic delimitation of the respective side channel 19th , 21 on the axis of rotation 4th facing side by means of a third and fourth gap 36 , 38 that are also between the housing 3 and the compressor wheel 2 are trained. To ensure a good efficiency of the side channel blower 1 To be able to achieve, need the column 32 , 34 , 36 , 38 be dimensioned accordingly small. In the area of the column 32 , 34 , 36 , 38 A functionally relevant gap is formed in each case.

In 1 it is shown that the drive 6th a stator 11 and a rotor 17th having, the stator 11 and / or the rotor 17th along the first and / or second axis of symmetry 26th , 28 are arranged. In the side channel compressor according to the invention according to a first exemplary embodiment, the stator 11 and / or the rotor 17th in an area between the axis of rotation 4th and the compressor wheel 2 , especially an inside diameter 24 of the compressor wheel 2 arranged with the rotor 17th and / or a receiving ring 9 of the rotor 17th in the area of a third or fourth functionally relevant gap 36 , 38 are located. The stator 11 is sleeve-shaped around the axis of rotation 4th educated. The receiving ring 9 is as a sleeve around the axis of rotation 4th formed circumferential component, for example, form-fitting, materially or non-positively with the compressor wheel 2 , especially the inside diameter 24 of the compressor wheel 2 , is connected with the receiving ring 9 along the first and / or second axis of symmetry 26th , 28 is arranged. This can be done on the inside diameter of the mounting ring 9 the rotor 17th be arranged. In addition, the mounting ring 9 , especially the material of the mounting ring 9 , has a high thermal conductivity and / or a high inductive resistance. This allows a faster transfer of heat energy from the stator 11 on the mounting ring 9 can be achieved, either as thermal radiation or as inductive or magnetic energy, whereby the ice bridges in the area of the crevice 32 , 34 , 36 and or 38 can be eliminated faster.

Furthermore, in 1 shown that the compressor wheel 2 a first radius 13th and a second radius 15th having, the second radius 15th smaller than the first radius 13th is and where the center M of the radii 13th , 15th on the axis of rotation 4th lies. In the area of the first radius 13th is the first and second gap 32 , 34 and in the area of the second radius 15th the third and fourth crevice 36 , 38 . The area of the first radius 13th can also be used as the outer ring of the compressor wheel 2 and the area of the second radius 15th as the inner ring of the compressor wheel 2 are designated. The compressor wheel 2 in the area of the second radius 15th a sleeve-shaped approach 10 on, the sleeve-shaped circumferential to the axis of rotation 4th and runs axially to this. The compressor wheel 2 is about the approach 10 via a first camp 27 and / or a second bearing 47 on a journal 12th stored, with the bearing journal 12th especially in the lower part of the housing 8th is trained. At the camps 27 , 47 In particular, it can be ball bearings 27 , 47 is, preferably deep groove ball bearings 27 , 47 .

The stator 11 is supported by a pot-shaped stator housing 39 comprises, wherein the stator housing 39 on the lower part of the housing 8th in the direction of the axis of rotation 4th facing away from the side has an opening, wherein the stator housing 39 in the area of the opening by means of a stator plate 43 can be closed. The components 11 , 39 , 43 can at least almost completely in the direction of the axis of rotation 4th into a recess in the housing 3 be inserted, the opening being about the axis of rotation 4th circumferential bore in the area of the housing 3 is trained. The area inside the stator housing 39 on the axis of rotation 4th facing side, in which the stator 11 is located is called the stator space 35 designated. The area outside the stator housing 39 on the axis of rotation 4th remote side in the housing 3 , in which the rotor 17th located is called rotor space 33 referred to, where the rotor space 33 at least fluidically from the side channels 19th , 21 is separated. The stator housing 39 is ideally made of a plastic to ensure that there is no influence between the rotor 17th and the stator 10 to ensure the stator plate 43 pushing out the stator housing 39 prevented by the overpressure in the pneumatic area. In addition, the electrical components of the stator 11 by means of the stator plate 43 protected from outside dirt and moisture. The stator 10 can be inside the stator housing 39 be fixed positively or positively. There is also a first sealing element 37 between the upper part of the housing 7th and the stator housing 39 whereby an encapsulation of the rotor space 33 against moisture and / or contamination from outside the side channel blower 1 is achieved. By means of a second sealing element 41 , which is located between the upper part of the housing 7th and the lower part of the housing 8th is located, an additional encapsulation of the area located within the housing, in particular the side channels 19th , 21 , against moisture and / or contamination from outside the side channel blower 1 achieved.

In 2 becomes an in 1 with AA designated section of the side channel compressor shown in an enlarged view. It is shown that the rotor 17th several rotor plates 17th has, which revolve around the axis of rotation 4th are arranged, the rotor plates 17th in particular form-fitting and / or force-fitting and / or a material fit with the receiving ring 9 and / or the compressor wheel 2 are connected. Furthermore, one is around the axis of rotation 4th circumferential bounding perimeter 18th shown extending between the stator 11 and the rotor 17th is located, where the perimeter is 18th in the area of (in 1 shown) stator housing 39 can be located.

In addition, is the normal plane 25th shown by the first axis of symmetry 26th and the second axis of symmetry 28 is stretched.

3 shows a schematic sectional view of a side channel compressor according to the invention according to a second embodiment. In this embodiment, the stator 11 and / or the rotor 17th in one of the axis of rotation 4th remote area of the compressor wheel 2 arranged, in particular outside an outer diameter of the compressor wheel 2 . The rotor is located here 17th and / or a receiving ring 9 of the rotor 17th in the area of a first or second functionally relevant gap 32 , 34 , the receiving ring 9 sleeve-shaped circumferentially around the axis of rotation 4th runs. The receiving ring 9 is in this case with its inner diameter form-fitting, materially or non-positively with the outer diameter of the compressor wheel 2 connected. On the outside diameter of the mounting ring 9 can the rotor 17th to be appropriate. In this exemplary embodiment, the stator 11 a larger diameter than the rotor 17th and is located on the axis of rotation 4th remote side of the rotor 17th , especially in the case 3 . Furthermore, the stator 11 on one in this second embodiment sleeve-shaped around the axis of rotation 4th circumferential stator sleeve 20th be attached, in particular to their outer diameter. This is where the stator sleeve is located 20th between the stator 11 and the rotor 17th and causes a fluidic separation of the rotor space 33 from the stator space 35 . There is also a spacer sleeve 29 axial to the axis of rotation 4th between the upper part of the housing 7th and the lower part of the housing 8th and / or stands with these 7, 8 axially to the axis of rotation 4th in Appendix. The spacer sleeve limits it 29 the stator space 35 outwards on the axis of rotation 4th facing away from the side and encapsulates this 35 against moisture and dirt from the outside.

In 3 is also shown. that there is at least one first washer 40a , b and / or at least one second intermediate disk 42a , b in the housing 3 , especially in the area of the columns 32 , 34 , 36 , 38 facing end faces of the housing 3 are located, with the washers 40 , 42 each disc-shaped circumferentially around the axis of rotation 4th run away. These washers 40 , 42 can be positively, cohesively or non-positively with the housing 3 be connected. By means of the washers 40 , 42 can accelerate the application of heat to remove ice bridges in the areas of the crevice 32 , 34 , 36 , 38 be achieved. The at least one first intermediate disk has 40 a larger radius than the at least second intermediate disk 42 , the at least one first Washer 40 has a radius that is at least nearly the first radius 13th corresponds and / or the at least one second intermediate disk 40 has a radius that is at least substantially the second radius 15th corresponds to. In a further exemplary embodiment, the first intermediate disk 40 and the second washer 42 is designed as a one-piece component, the first intermediate disk 40 and the second washer 42 are connected via a bridge in the breaker area.

In 4th is a schematic sectional view of a side channel compressor according to the invention according to a fourth embodiment. In this embodiment, the receiving ring 9 at its axis of rotation axially to 4th end faces each run one disk-shaped around the axis of rotation 4th running inner flange 48a , b on, this respective inner flange 48a , b in each case a surface on the compressor wheel side running radially to the axis of rotation 44 , 46 in the area of the first or second gap 32 , 34 trains. Furthermore, the components can be stator 11 and / or stator sleeve 20th be at least almost U-shaped, the U-shaped opening in each case to the axis of rotation 4th and thus the rotor 17th is facing and this at least almost completely encloses, whereby an improved encapsulation of the rotor 17th and / or an optimization of the rotating magnetic field between the stator 11 and rotor 17th can be achieved.

The side channel blower 1 In accordance with all the exemplary embodiments described above, a method for starting, in particular cold starting, and / or for switching off can be operated in which the stator is energized 11 takes place without creating a rotating field between the stator 11 and the rotor 17th builds up and thus no or very little rotation of the rotor 17th around the axis of rotation 4th adjusts. This procedure can cause the side channel blower to heat up 1 be used, especially around ice bridges in the area of the respective column 32 , 34 , 36 , 38 to eliminate. In addition, the energization of the stator 11 inductive heating of the rotor 17th cause a thermal energy transfer from the rotor 17th on the compressor wheel 2 and / or the receiving ring 9 and / or the respective gap 32 , 34 , 36 , 38 he follows.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102010035039 A1 [0003]
• DE 102010035039 [0004, 0005]

Claims (11)

Side channel compressor (1) for a fuel cell system (31) for conveying and / or compressing a gaseous medium, in particular hydrogen, with a housing (3), with a compressor wheel (2) located in the housing (3), which is rotatable about an axis of rotation ( 4) is arranged and driven at least indirectly by a drive (6), the compressor wheel (2) having delivery cells (5) arranged on its circumference in the region of a compressor chamber (30), and each with a gas pump formed on the housing (3) Inlet opening (14) and a gas outlet opening (16), which are fluidically connected to one another via the compression chamber (30), in particular the at least one side channel (19, 21), with a first and / or second axis of symmetry (26, 28) , in particular the flow contour, of the compressor wheel (2) run orthogonally to the axis of rotation (4) and the respective side channel (19, 21) at least fluidically delimiting each e in functionally relevant gap (32, 34, 36, 38) between the housing (3) and the compressor wheel (2), characterized in that the drive (6) has a stator (11) and a rotor (17), the The stator (12) and / or the rotor (17) are arranged along the first and / or second axis of symmetry (26, 28). Side channel compressor (1) according to Claim 1 , characterized in that the stator (11) and / or the rotor (17) are arranged in an area of the compressor wheel (2) facing away from the axis of rotation (4), in particular outside an outer diameter of the compressor wheel (2), the rotor ( 17) and / or a receiving ring (9) of the rotor (17) are located in the area of a first or second functionally relevant gap (32, 34), the receiving ring (9) running around the axis of rotation (4) in the shape of a sleeve. Side channel compressor (1) according to Claim 1 , characterized in that the stator (11) and / or the rotor (17) are arranged in an area between the axis of rotation (4) and the compressor wheel (2), in particular an inner diameter (24) of the compressor wheel (2), with the rotor (17) and / or a receiving ring (9) of the rotor (17) are located in the area of a third or fourth functionally relevant gap (36, 38), the receiving ring (9) running around the axis of rotation (4) in the shape of a sleeve. Side channel compressor (1) according to Claim 2 or 3 , characterized in that the stator (11) is designed in the form of a sleeve, encircling the axis of rotation (4). Side channel compressor (1) according to one of the Claims 2 , 3 or 4th , characterized in that the rotor (17) has several rotor plates (17) which are arranged circumferentially around the axis of rotation (4), the rotor plates (17) in particular positively and / or non-positively and / or one integral with the receiving ring (9) and / or the compressor wheel (2) are connected. Side channel compressor (1) according to one of the Claims 2 , 3 or 5 , characterized in that the receiving ring (9), in particular the material of the receiving ring (9), has a high thermal conductivity and / or a high inductive resistance. Side channel compressor (1) according to one of the Claims 2 , 3 , 5 or 6th characterized in that the receiving ring (9) on its end faces axially to the axis of rotation (4) each have an inner flange (48a, b) extending in the form of a disk around the axis of rotation (4), this respective inner flange (48a, b) each having a radial to the The axis of rotation (4) running on the compressor wheel side surface (44, 46) in the area of the first or second gap (32, 34). Side channel compressor (1) according to one of the preceding claims, characterized in that there is at least one first intermediate disk (40a, b) and / or at least one second intermediate disk (42a, b) in the housing (3), in particular in the area of the gaps (32 , 34, 36, 38) facing end faces of the housing (3) are located, the intermediate disks (40, 42) each extending in the form of a disk around the axis of rotation (4). Side channel compressor (1) according to Claim 2 to 8th , characterized in that there is a spacer sleeve (29) axially to the axis of rotation (4) between the upper housing part (7) and the lower housing part (8) and / or with these (7, 8) axially to the axis of rotation (4) is attached. Method for starting, in particular cold starting, and / or switching off the side channel compressor (1) according to one of the Claims 1 to 9 , characterized in that the stator (11) is supplied with current without a rotating field building up between the stator (11) and the rotor (17) and thus no or very little rotational movement of the rotor (17) about the axis of rotation ( 4) sets. Procedure according to Claim 10 , characterized in that the energization of the stator (11) causes inductive heating of the rotor (17), with a transfer of heat energy from the rotor (17) the compressor wheel (2) and / or the receiving ring (9) and / or the respective gap (32, 34, 36, 38) takes place.

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