DE102018212490A1 - Foil gas storage device for storing a rotor and method and use - Google Patents

Abstract

Foil gas bearings for rotors are interested in high load capacity and robust bearings, especially at high speeds. A foil gas storage device (10) is provided for supporting a rotor (2, 12) by means of gas (G), with a top foil device (14) on the rotor side for defining a bearing level (8) for the rotor, and with a top foil device on a carrier (6, 16) supporting bump film device (15), it being provided according to the invention that the film gas storage device has at least one chamfered peripheral region (α1) formed by the top film device, which is located in the direction of rotation between the carrier (16) and extends from the bearing plane (8) and ends in the bearing plane, and that the top film device on the top (14a) is structured by recesses (14.1) running radially inwards. As a result, a robust bearing for large forces and / or high speeds can be provided. The invention further relates to a method and a use for such a film gas storage device.

Description

TECHNICAL AREA

The present invention relates to a device for supporting a rotor by means of gas, e.g. for air storage, especially for oil-free storage. In particular, the invention relates to a device for supporting a rotor at high axial forces and / or at high rotational speeds. Last but not least, the present invention also relates to the use of axial foil gas bearings. In particular, the invention relates to a device and a method according to the preamble of the respective independent claim.

BACKGROUND OF THE INVENTION

So-called foil gas bearings or foil bearings have proven to be useful for mounting a rotor, in particular with high axial forces and / or at high rotational speeds. Foil gas bearings are used, for example, in pumps at high speeds of rotation of the respective rotor. Load fluctuations in the axial direction (along the axis of rotation of the rotor) can in particular be absorbed by means of foil gas bearings. Conventional foil gas bearings consist of foil layers with largely flat surfaces. A surface, in particular statically arranged relative to the rotor (so-called top foil) delimits an air gap and is elastically deformable and yields to a pressure generated in the air gap in particular as a function of a rotational speed. In particular, a pressure field within a bearing gap between the rotor and the adjacent top foil leads to a deformation of the foil, which influences the behavior of the bearing. The properties of the foil gas bearing, in particular also the load-bearing capacity in the axial direction, are therefore strongly predefined by the configuration of the foils and by the interaction of the rotor with the foils. When designing and optimizing foil gas bearings, there is therefore interest in being able to influence and optimize the effects of the foils on the rotor and on the formation of the pressure conditions as precisely as possible.

The patent specification EP 2 375 089 B1 describes a dynamic foil gas storage with sheet-like foils with holding surfaces and connecting surfaces.

On the basis of this prior art, there is interest in improving the technical possibilities and features of film bearings, in particular with regard to the requirements for axial bearing.

SUMMARY OF THE INVENTION

The object is to provide a device for gas storage or air storage of a rotor, with which the rotor can be supported in particular with high axial forces and / or in particular at high rotational speeds with a high load-bearing capacity. In particular, the task is to enable efficient, oil-free mounting of a high-speed rotor, at least in the axial direction, in such a way that a comparatively high axial force can be applied to the rotor, in particular also with advantageous side effects with regard to friction or heat development and with regard to stability.

This object is achieved by a film gas storage device according to claim 1 and by a method according to the respective subordinate method claim. Advantageous developments of the invention are explained in the respective subclaims. The features of the exemplary embodiments described below can be combined with one another, unless this is explicitly denied.

A foil gas storage device is provided for storing a rotor by means of gas, with a rotor-side top foil device for defining a bearing level for the rotor, and with a bump foil device supporting the top foil device on a carrier. The bump film device is preferably set up to deform the top film device in response to a pressure exerted on the bearing level.

According to the invention, it is proposed that the film gas storage device has at least one beveled peripheral area formed by the top film device, which extends in the direction of rotation between the carrier and the bearing plane and ends in the bearing plane, and that the top film device on the top side from radially outwards recesses running inside (in particular at least in sections radially or obliquely to the radial direction) is structured. Alternatively, the rotor can be structured accordingly. This provides robust, stable storage, even at high speeds, even at high loads.

In contrast to previously tried-and-tested technologies, in particular in contrast to the axial film bearings with flexible surfaces described above, according to the invention, the field of use of the film gas bearings can be expanded with high system security using simple means. A high axial load-bearing capacity can be achieved. Furthermore, the friction loss of the bearing can be minimized. In particular, a combination of the technical features “sloping Circumferential area ”and“ recesses ”enables an improvement of the bearing properties. In particular, an axial foil bearing with recesses in the form of spiral grooves can be provided.

A conventional axial foil gas storage usually has two foil parts: the so-called top foil (top foil), and the so-called bump foil (bump foil), the top foil resting on the flexible, damping bump foil, and where the top foil together with the rotor limits or delimits the gas film in the axial direction on both sides. The flexible bump foil can allow an (elastic) deformation of the top foil, especially when pressure is applied or pressure is exerted (pressure field of the gas film).

The top foil can be equipped with two different zones (areas): convergent zone for narrowing an air gap between the top foil and the rotor; and so-called plateau zone in (at least approximately) parallel arrangement to the rotor. The pressure in the gas film can be increased by means of these two zones, and thus the bearing capacity of the bearing can also be defined or increased, in particular as a function of a rotation of the rotor or as a function of a rotational speed.

Proceeding from this, the invention is based on the concept of producing high stability and good damping and load-bearing properties by providing recesses on the top of the top film device, in particular recesses in the form of grooves, which recesses are set up with a relative rotational movement between Pumping rotor and top foil device inwards.

The recesses advantageously act based on a rotation of the rotor relative to the top film device. The recesses can alternatively be located on the rotor instead of on the top foil device. The recesses are designed to convey gas into the air gap of the bearing (in particular in the sense of: pumping gas), in particular with the effect of increasing the pressure of the gas film in the air gap.

The recesses or grooves are advantageously arranged in a spiral, at least in sections. The recesses can be designed or arranged as inward (radially inward) pumping grooves. The recesses can in particular begin exactly on the outside of the outside radius (outside edge). The recesses can, in particular, extend or be arranged inwards up to a radial position further out than the inner radius (inner edge) of the top film device. For example, the recesses extend up to half the radial extent of the top film device (half the radial length).

The recesses, in particular grooves, are advantageously arranged at an angle between 95 ° and 175 ° with respect to the tangential direction. This provides high efficiency, especially an optimal pumping effect.

The recesses, in particular grooves, can be arranged or introduced in an orientation from the inside to the outside, at least partially and / or in sections in the circumferential direction and / or in the radial direction in sections.

The recesses, in particular grooves, can be arranged or introduced in opposite directions, at least partially and / or in sections in the circumferential direction and / or in the radial direction in sections.

Thanks to the configuration according to the invention, the geometry of the recesses on the top film device can also be optimized in a simple manner and adapted to the respective application or the desired pressure conditions or relative speeds or gas densities, in particular to maximize the load-bearing capacity and / or to increase efficiency (reduction loss of effectiveness). In this way, the heat balance can also be optimized. In other words, the removal of thermal energy in particular can be ensured in a simpler way. Furthermore, the recesses according to the invention can be produced in a comparatively uncomplicated manner, in particular in a simple, inexpensive manufacturing step.

The recesses according to the invention, in particular in the form of spiral grooves, in an arrangement on a statically arranged, flexibly mounted surface of a gas bearing, provide a noticeable improvement in terms of load-bearing capacity and running properties, in particular in combination with the bevelled peripheral area (convergent peripheral area set up to narrow the air gap) , In contrast to the present invention, an arrangement deviating therefrom has hitherto been used in the prior art, namely the rotating and static surfaces in a parallel arrangement to one another, and / or an essentially flat upper side of the top film has been provided.

The foil gas storage device can in particular also be set up to absorb essentially axially aligned forces. In this case, the foil gas storage device also be referred to as a film gas axial storage device.

Advantageous configurations of the recesses are described in more detail below.

According to one exemplary embodiment, the recesses are designed to convey (or pump) gas radially inward when the rotor rotates. This also favors the generation of a comparatively high gas pressure or gas flow.

According to one exemplary embodiment, when the rotor rotates, the recesses are set up to build up a pressure in a central cavity of the foil gas bearing device, which is delimited by the foil devices on the outside. This also enables the controlled introduction of gas into a central area of the bearing.

According to one embodiment, the recesses are designed as grooves or as grooves. As a result, the recesses can also be produced in a comparatively simple manner. Grooves or grooves can also be individually designed in terms of geometry, shape and depth.

According to one embodiment, the recesses have a constant depth, at least over a length section greater than half the length of the recesses, in particular up to or shortly before an inner end of the recesses. This also enables largely constant flow conditions within the respective recess.

According to one embodiment, the recesses have a continuous run-out area with a continuously decreasing depth at / at the respective inner end. In particular, this favors a transfer of gas flows out of the recesses into a gap between two flat surfaces. This can favor the formation of a stable gas film.

Advantageous orientations of the recesses are described in more detail below.

According to one embodiment, the recesses run at least in sections in the radial direction. This enables efficient internal pumping.

According to one embodiment, the recesses are curved at least in sections. According to one embodiment, the recesses run at least in sections in a spiral. This also provides advantages in terms of friction, conservation of momentum and the most homogeneous possible pressure ratios.

According to one embodiment, the recesses run at least in sections from the outside to the radially inside with a decreasing radius of curvature. According to one exemplary embodiment, a / the radius of curvature of the recesses increases radially outwards, in particular continuously. This also favors the feeding of gas from the outside into the film gas storage device, in particular when the top film device is arranged statically.

According to one exemplary embodiment, a / the radius of curvature of the recesses is the smallest radially on the inside. This also favors the feeding of gas inwards under advantageous flow conditions, in particular into a central cavity.

According to one embodiment, the respective recess runs at least in sections in a straight line without curvature (radius of curvature zero), in particular radially on the outside. This also favors the feeding of gas, in particular depending on a speed or a configuration of the rotor or a distance between the top film device and the rotor.

According to one embodiment, the recesses extend between an inner edge of the top film device and an outer edge of the top film device. This also enables a specific specification of the respective flow path from the outside to the inside to a central cavity.

According to one exemplary embodiment, the recesses are oriented such that the recesses lead inwards to a / the central cavity in the relative direction of rotation of the rotor, in particular with a decreasing radius of curvature. This also provides a good pumping action.

According to one embodiment, the angle of the recesses is between 95 ° and 175 °. This also provides a good effect in terms of stability and load-bearing capacity and smoothness.

Advantageous arrangements of the recesses are described in more detail below.

According to one exemplary embodiment, the recesses extend from one / the outer edge of the top film device to at least half the width of the top film device, that is to say at least up to half the distance to / to the inner edge of the top film device. This also enables a stabilizing effect based on to generate fluidic phenomena, in particular due to varying cross-sectional profiles in the radial direction. The radial length of the recesses can also be selected depending on the design of the rotor.

According to one embodiment, the recesses extend from the outer edge at least to 1/3 the width of the top film device. This also enables the pumping in of gas in an outer edge region and the formation of a gas film further inward over a comparatively large radial section without the gas film being disturbed by edges or unevenness. Depending on the desired interaction between the top foil device and the rotor, a more or less wide gas film (in particular without recesses) may be desired.

According to one embodiment, the recesses extend from the outer edge at least to the 2/3 width of the rotor. This can also favor the pumping of a comparatively large amount of gas, with advantageous effects on the load-bearing capacity.

According to one embodiment, the recesses extend from the outer edge of the rotor to a maximum of half the width of the rotor. This leaves space radially on the inside for the formation of a gas film independently of recesses, in particular if the gas film is to be as little turbulent as possible or should be disturbed as little as possible by recesses.

According to one embodiment, the recesses extend from the outer edge to one / to the inner edge of the rotor. This can make it possible to exert a very specific influence on the gas transport to the inside, whereby it is also possible to exert an influence on the gas distribution, in particular depending on the configuration or size of the volume of a central cavity. Last but not least, friction can be minimized.

According to one exemplary embodiment, the recesses extend from one / the outer edge of the rotor at least up to half the width of the rotor, that is to say at least up to half the distance up to / to the inner edge of the rotor. This also enables a stabilizing effect to be generated based on fluid dynamics phenomena, in particular due to varying cross-sectional profiles in the radial direction. The radial length of the recesses can also be selected depending on the design of the rotor.

According to one embodiment, the recesses extend from the outer edge at least to 1/3 the width of the rotor. This also enables the pumping in of gas in an outer edge region and the formation of a gas film further inward over a comparatively large radial section without the gas film being disturbed by edges or unevenness. Depending on the desired interaction between the top foil device and the rotor, a more or less wide gas film (in particular without recesses) may be desired.

According to one embodiment, the recesses extend from the outer edge at least to the 2/3 width of the rotor. This can also favor the pumping of a comparatively large amount of gas, with advantageous effects on the load-bearing capacity.

According to one embodiment, the recesses extend from the outer edge of the rotor to a maximum of half the width of the rotor. This leaves space radially on the inside for the formation of a gas film independently of recesses, in particular if the gas film is to be as little turbulent as possible or should be disturbed as little as possible by recesses.

According to one embodiment, the recesses extend from the outer edge to one / to the inner edge of the rotor. This can make it possible to exert a very specific influence on the gas transport to the inside, whereby it is also possible to exert an influence on the gas distribution, in particular depending on the configuration or size of the volume of a central cavity. Last but not least, friction can be minimized.

Advantageous configurations of the beveled area are described in more detail below.

According to one embodiment, the bevelled peripheral region begins on the surface of the carrier. This also enables the design of film-free segments on the carrier, which can be used advantageously for regulating the pressure conditions.

According to one exemplary embodiment, a plurality of beveled circumferential regions are provided in a rotationally symmetrical arrangement, in particular two, three or four beveled circumferential regions, each spaced apart from one another at the same angle of rotation. This also provides advantages in terms of smoothness and stability.

According to one exemplary embodiment, the foil gas bearing device has a beveled in front of the (respective) one in the direction of rotation of the rotor Foil-free circumferential segment arranged circumferentially, which extends over the smallest possible angle of rotation (circumferential length). In connection with a pumping action of the recesses in particular, this provides advantages with regard to mass transport and damping properties of the bearing.

Advantageous arrangements of the recesses relative to the beveled area are described in more detail below.

According to one embodiment, some of the recesses or the recesses are (also) arranged in the bevelled peripheral region. As a result, a pumping action can be generated, in particular with largely homogeneous pressure build-up, in particular without disadvantageous pressure fluctuations. A gas carpet that forms in the bevelled peripheral region can already be aligned in the radial direction, in particular before a higher pressure builds up radially further inward in the gas film. Last but not least, this is advantageous in terms of friction and heat development.

According to one embodiment, the recesses are provided over the entire circumferential length of the tapered circumferential area. In this way, the synchronism or smoothness can also be optimized, in particular even at high pressures.

According to one embodiment, the recesses are provided in the bevelled circumferential area and merge continuously from the bevelled circumferential area into a flattened circumferential area of the top film device. This also provides advantages in terms of smooth running and homogeneous pressure build-up.

According to one embodiment, the foil gas bearing device is set up for oil-free axial bearing of the rotor exclusively by means of gas, in particular by means of air. As a result, the storage can be further simplified or optimized. Furthermore, a wide range of applications can be opened up.

According to one embodiment, the top film device is flexible. The top film device can be provided from a flexible material. The bearing properties can then also be determined by the material properties and / or by the arrangement of the bump film device. In this way, a damping function can also be fulfilled by means of the top film device, in particular depending on the manner in which the top film device is supported by the bump film device.

According to one embodiment, the recesses in the top film device are arranged statically or can be arranged statically relative to the rotor. The relative rotary movement is then determined exclusively by the manner in which the rotor rotates. Last but not least, this also makes it possible to provide a simple, robust, low-maintenance bearing arrangement.

The aforementioned object is in particular also achieved by a foil gas storage device designed to support a rotor by means of gas, with a rotor-side top foil device for defining a bearing level for the rotor, and with a bump foil device supporting the top foil device on a support, the Foil gas storage device has at least one beveled circumferential area formed by the top foil device, which extends in the direction of rotation between the carrier and the bearing plane and ends in the bearing plane, and that the top foil device is structured on the top by recesses running radially inwards, wherein the recesses are designed to convey gas radially inward when the rotor rotates, the recesses being designed as grooves or as grooves, the recesses being at least sectionally curved (in particular spiral), the recesses extending extend from the outer edge at least to 1/3 of the width of the top film device, the beveled circumferential area beginning on the surface of the carrier, the film gas storage device having a film-free circumferential segment arranged in the direction of rotation in front of the beveled circumferential area, with recesses also being arranged in the beveled circumferential area are. This results in numerous advantages mentioned above.

The aforementioned object is also achieved by using a foil gas bearing device, in particular a previously described foil gas bearing device, for the axial bearing of a rotor oil-free exclusively by means of gas, a top foil device of the foil gas bearing device being arranged relative to the rotor and relative to the direction of rotation of the rotor such that recesses arranged at the top of the top film device are oriented obliquely inward in the direction of rotation, in particular when the top film device is arranged statically, and that the top film device defines at least one bevelled peripheral region. This results in the aforementioned advantages.

The aforementioned object is also achieved by a film gas storage device, in particular a film gas storage device described above, produced by forming at least one of a beveled circumferential area formed in a top film device, which extends in the direction of rotation between a support and a bearing plane and ends in the bearing plane, and by structuring the top film device on the top side from radially inward (in particular at least in sections radially or obliquely to the radial one Direction) extending recesses. This results in the aforementioned advantages. The aforementioned object is also achieved by a rotor set up for mounting on a device for mounting a rotor by means of gas, with a film device for defining a bearing level for the rotor, and with a bump film device supporting the film device on a carrier. The rotor is characterized in that the rotor or the device for mounting the rotor has at least one beveled peripheral area formed by the film device, which extends in the direction of rotation between the carrier and the bearing plane and ends in the bearing plane, and in that the rotor is formed by recesses extending radially inward is structured.

• Bereitstellen einer auf einem Träger abgestützten Bump-Folieneinrichtung zum Abstützen einer Top-Folieneinrichtung;
• relatives Anordnen und Befestigen der rotorseitig anordenbaren Top-Folieneinrichtung auf der Bump-Folieneinrichtung zur Definition einer Lagerebene für den Rotor;

ferner mit den Schritten:

• Ausbilden wenigstens eines von der Top-Folieneinrichtung gebildeten abgeschrägten Umfangsbereichs, der sich in Drehrichtung zwischen dem Träger und der Lagerebene erstreckt und in der Lagerebene endet, wobei das relative Anordnen der Top-Folieneinrichtung derart erfolgt, dass auf der Oberseite der Top-Folieneinrichtung angeordnete Ausnehmungen von radial außen nach innen verlaufen, insbesondere spiralförmig. Hierdurch ergeben sich zuvor genannte Vorteile.

The aforementioned object is also achieved by a method for providing a foil gas storage device, in particular a previously described foil gas storage device, for storing a rotor by means of gas, with the steps:

• Providing a bump film device supported on a carrier for supporting a top film device;
• relative arrangement and fastening of the top foil device, which can be arranged on the rotor side, on the bump foil device for defining a bearing level for the rotor;

further with the steps:

• Form at least one beveled peripheral area formed by the top film device, which extends in the direction of rotation between the carrier and the bearing plane and ends in the bearing plane, the relative arrangement of the top film device being such that recesses arranged on the top of the top film device extend radially inwards, in particular spiral. This results in the aforementioned advantages.

According to one embodiment, the method also includes structuring the top of the top film device by introducing the recesses. As a result, the properties of the film gas storage device can be adapted even more specifically to an application. In particular, an axial foil gas storage device with recesses in the form of spiral grooves can be provided.

list of figures

• 1 in einer geschnittenen Seitenansicht in schematischer Darstellung ein Umfangssegment eines Folienlagers gemäß dem Stand der Technik;
• 2 in einer Draufsicht in schematischer Darstellung einen Teil bzw. ein Umfangssegment einer Foliengaslagervorrichtung gemäß einem Ausführungsbeispiel; und
• 3 in einer perspektivischen Ansicht seitlich von oben in schematischer Darstellung eine Foliengaslagervorrichtung gemäß einem Ausführungsbeispiel.

The invention is described in more detail in the following drawing figures, reference being made to the other drawing figures for reference signs which are not explicitly described in a respective drawing figure. Show it:

• 1 in a sectional side view in a schematic representation of a peripheral segment of a film store according to the prior art;
• 2 a plan view in a schematic representation of a part or a peripheral segment of a film gas storage device according to an embodiment; and
• 3 In a perspective view from the side in a schematic representation of a film gas storage device according to an embodiment.

DETAILED DESCRIPTION OF THE FIGURES

In 1 is a conventional foil gas storage 1 shown on which a rotor 2 is stored. Between the rotor and a top foil 4 (so-called top foil) is an air gap 3 formed with gas G , in particular ambient gas or ambient air is filled. The top of the top slide 4 defines a storage level 8th for the rotor 2 , The top film 4 is on a bump slide 5 (so-called Bump Foil; or Compliant Foil) stored and can also be damped in a sense, and the bump film 5 (shown schematically as damping compression springs) is on a carrier 6 supported. The rotor rotates relative to the foil gas bearing 1 , The direction of rotation of the rotor or, correspondingly, the circumferential direction or a corresponding angle of rotation becomes with the angle α and the arrow in 1 indicated. The axial direction is indicated by the arrow x indicated, and the radial direction is indicated by the arrow r indicated.

The top film 4 runs not only in the storage level 8th , but has at least two different sections, namely a converging chamfered peripheral region or peripheral segment α1 (so-called ramp zone; or convergent zone), followed by a constant flattened peripheral area or peripheral segment (so-called plateau zone) α2 ,

In the air gap 3 pressure conditions arise depending on the ambient pressure, relative speed of rotation and bearing load.

In the 2 . 3 is a foil gas storage device 10 described. A top film facility 14 defined with their top 14a (especially with a top film 14.2 ) the Storage level, with the top foil facility 14 by means of a bump film device 15 on a support 16 is supported.

The top foil device 14 has a large number of individual recesses 14.1 on, in particular in each case in the form of grooves, the recesses extending over a radial section 14.3 extend which, depending on requirements, can be significantly smaller than the radial width of the top film device 14 , which by an inner radius or an inner edge Ri and by an outer radius or an outer edge R0 the film device is specified. The recesses end radially inwards at an (intermediate) inner radial position rg between inside and outside edge. The respective recess runs at an inner end 14:11 on the inside edge, especially steadily.

Alternatively, the recesses can 14.1 also located on the rotor.

For the top film 14.2 or for the top film setup 14 the following colloquial name is conceivable: Grooved Top Foil.

In the in 2 respectively. 3 In the variant shown, the recesses run at least in sections in a spiral shape and extend over a radial width in the range from ¼ to 1/3 or ½ of the radial width of the top film device 14 , and are along the entire surface of the top film device 14 provided, that is, all the way round (apart from any film-free circumferential segments on the carrier 16 ).

In the 2 two angles characterizing the course of the recesses are indicated. The angles with respect to the tangential direction should typically be between 95 ° and 175 °. The angle can change its amount in the radial direction or can also be constant. In the second case, the recesses follow a logarithmic spiral.

In 3 are film-free segments or film-free peripheral areas 17 shown. The film-free peripheral segment should be made as small as possible. A centrally located cavity 18 is about these segments 17 radially connected to the outside. In 3 are also the means of the film gas storage device 10 mounted rotor 12 (Dashed line) and the air gap formed between them 13 indicated.

By means of the recesses 14.1 For example, gas or air can be pumped radially inwards, in particular in relation to the characteristics of a rotor 12 and top film setup 14 To be able to adjust the forming gas film, in particular to regulate the flow and pressure conditions when the rotor rotates relative to a statically arranged top film device.

LIST OF REFERENCE NUMBERS

1

conventional foil gas storage

2

rotor

3

air gap

4

Top foil

5

Bump foil (so-called bump foil; or compliant foil)

6

carrier

8th

storage level

10

Foil gas bearing structure

12

rotor

13

air gap

14

Grooved Top Foil

14a

top

14.1

individual recesses, especially groove

14:11

inner end

14.2

Top film

14.3

radial section of the recesses

15

Bump foil device

16

carrier

17

film-free segment or film-free peripheral area

18

centrically arranged cavity

G

Gas, especially ambient gas

Ri

Inner radius or inner edge of the film

rg

(Intermediate) inner radial position of the recesses between the inner and outer radius

R0

Outer radius or outer edge of the film device or of the rotor or bearing

α

Direction of rotation of the rotor, or circumferential direction or angle of rotation

α1

converging beveled peripheral area or peripheral segment (so-called ramp zone; or convergent zone)

α2

constant flattened peripheral area or peripheral segment (so-called plateau zone)

β

outer angle of the recesses, particularly with respect to the tangential direction

γ

inner angle of the recesses, in particular with respect to the tangential direction

x

axial direction

r

radial direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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

• EP 2375089 B1 [0003]

Claims (11)

Foil gas storage device (10) set up for storing a rotor (2, 12) by means of gas (G), with a rotor-side top foil device (14) for defining a bearing level (8) for the rotor, and with a top foil device on a carrier (6, 16) supporting bump film device (15), characterized in that the film gas storage device has at least one chamfered peripheral region (α1) formed by the top film device, which extends in the direction of rotation between the carrier (16) and the bearing plane (8) extends and ends in the bearing plane, and that the top film device on the top (14a) is structured by recesses (14.1) running radially inwards or that the rotor (2, 12) is formed by recesses running radially inwards ( 14.1) is structured. Foil gas storage device according to Claim 1 , wherein the recesses (14.1) are arranged for the rotation of the rotor (2, 12) for conveying gas radially inwards; and / or wherein the recesses (14.1), when the rotor (2, 12) rotates, are set up to build up a pressure in a central cavity (18) of the film gas storage device, which is delimited by the film devices on the outside; and / or wherein the recesses (14.1) are designed as grooves or as grooves. Foil gas storage device according to one of the preceding claims, wherein the recesses (14.1) extend at least in sections in the radial direction (r); and / or wherein the recesses (14.1) are curved at least in sections; and / or wherein the recesses (14.1) run at least in sections in a spiral shape; and / or wherein the recesses (14.1) run at least in sections from the outside to the radially inside with a decreasing radius of curvature; and / or wherein a / the radius of curvature of the recesses (14.1) increases radially outwards, in particular continuously; and / or wherein a / the radius of curvature of the recesses (14.1) is the smallest radially on the inside; and / or wherein the respective recess (14.1) runs at least in sections in a straight line without curvature, in particular radially on the outside; and / or wherein the angles of the recesses are between 95 ° and 175 ° with respect to the tangential direction. Foil gas storage device according to one of the preceding claims, wherein the recesses (14.1) extend from one / the outer edge (R0) of the top foil device at least to half the width of the top foil device, that is to say at least up to half the distance up to / to the inner edge (Ri) the top film device; or wherein the recesses (14.1) extend from the outer edge (R0) at least to 1/3 the width of the top film device; or wherein the recesses (14.1) extend from the outer edge (R0) at least up to 2/3 the width of the top film device; or wherein the recesses (14.1) extend from one / the outer edge (R0) of the top film device to a maximum of half the width of the top film device. Foil gas storage device according to one of the Claims 1 to 3 , wherein the recesses (14.1) extend from one / the outer edge (R0) of the rotor at least to half the width of the rotor, that is to say at least up to half the distance up to / to the inner edge (Ri) of the rotor; or wherein the recesses (14.1) extend from the outer edge (R0) at least to 1/3 the width of the rotor; or wherein the recesses (14.1) extend from the outer edge (R0) at least up to 2/3 the width of the rotor; or wherein the recesses (14.1) extend from one / the outer edge (R0) of the rotor to a maximum of half the width of the rotor. Foil gas storage device according to one of the preceding claims, wherein the chamfered peripheral region (α1) begins on the surface of the carrier (16); and / or wherein a plurality of chamfered circumferential regions (α1) are provided in a rotationally symmetrical arrangement, in particular two, three or four chamfered circumferential regions (α1) each spaced apart from one another at the same angle of rotation; and / or wherein the foil gas storage device (10) has a foil-free peripheral segment (17) which is arranged in the direction of rotation in front of the tapered peripheral region (α1) and which extends over the smallest possible angle of rotation. Foil gas storage device according to one of the preceding claims, wherein recesses (14.1) are arranged in the bevelled peripheral region (α1); or wherein recesses (14.1) are provided over the entire circumferential length of the chamfered circumferential region (α1); and / or wherein recesses (14.1) are provided in the bevelled circumferential area, which merge continuously from the bevelled circumferential area into a flattened circumferential area (α2) of the top film device (14). Foil gas storage device according to one of the preceding claims, wherein the foil gas storage device (10) is set up for oil-free axial mounting of the rotor (2, 12) exclusively by means of gas (G), in particular by means of air; and / or wherein the top film device (14) is flexible; and / or wherein the recesses (14.1) of the top film device or of the rotor (2, 12) can be arranged statically. Use of a foil gas storage device, in particular a foil gas storage device (10) according to one of the preceding claims, for the axial bearing of a rotor oil-free exclusively by means of gas, a top film device (14) of the film gas bearing device being arranged relative to the rotor (12) and relative to the direction of rotation of the rotor in such a way that on the top (14a) Top film device (14) or the rotor-arranged recesses (14.1) are oriented obliquely inwards in the direction of rotation, and that the top film device (14) defines at least one chamfered peripheral region (α1). Foil gas storage device, in particular foil gas storage device (10) according to one of the preceding device claims, produced by forming at least one chamfered peripheral region (α1) formed by a top foil device (14), which extends in the direction of rotation between a carrier (16) and a bearing plane (8) and ends in the bearing plane, and by structuring the top film device (14) on the upper side (14a) by recesses (14.1) running radially inwards or by structuring the rotor on the bottom side by recesses running radially inwards ( 14.1). Method for providing a foil gas storage device, in particular a foil gas storage device (10) according to one of the preceding device claims, for storing a rotor (2, 12) by means of gas (G), comprising the steps: providing a bump supported on a carrier (6, 16) Film device (15) for supporting a top film device; relative arrangement and fastening of the top foil device (14), which can be arranged on the rotor side, on the bump foil device (15) to define a bearing plane (8) for the rotor; characterized by the steps: forming at least one chamfered peripheral region (α1) formed by the top film device (14), which extends in the direction of rotation between the carrier (16) and the bearing plane (8) and ends in the bearing plane, the relative arrangement of the top film device takes place in such a way that recesses (14.1) arranged on the top side (14a) of the top film device run radially inward, in particular spiral, or that recesses (14.1) arranged on the underside of the rotor run radially inwards , especially spiral.

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