Damping element for bearing and element for compressing or expanding gas

Abstract

The utility model relates to a damping element for a bearing and an element for compressing or expanding a gas. The present disclosure relates to a damping element for a bearing wherein the damping element (1) comprises a ring structure (3) comprising an inner ring (4) and an outer ring (5) surrounding the inner ring wherein the inner ring (4) and the outer ring (5) are connected by an intermediate structure (6) having a plurality of slots (7), the inner ring (4) has a slot (7) extending through the ring structure (3) in an axial direction parallel to a rotational symmetry axis (8) of the inner ring (4), and wherein the damping element (1) is configured to secure the inner ring (4) to the bearing, characterized in that the damping element (1) has a slot (7) extending through the ring structure (3) in an axial direction parallel to the rotational symmetry axis (8) of the inner ring (4). The damping element (1) is further configured to fix the annular side of the outer ring (5) laterally to a support object along the rotational symmetry axis (8).

Description

Technical Field

[0001] The utility model relates to:

[0002] - Damping elements for bearings;

[0003] - An element for compressing or expanding a gas provided with such a damping element.

[0004] More specifically, the invention is intended to be applied to a machine having a rotor, such as a turbine or a screw compressor, wherein the shaft of the rotor is rotatably mounted in a casing of the machine by means of a plurality of bearings. Background Art

[0005] It is known that machines having a rotor rotating at high speeds often have vibration problems in one or more speed ranges, especially if the machine resonates in these speed ranges.

[0006] In this speed range, the vibration level of the machine can become so high that it can damage the machine.

[0007] In some cases, vibration problems can be prevented or at least limited by avoiding these speed ranges as much as possible.

[0008] This means that when the rotor needs to rotate at speeds within the above speed ranges, for example when the machine is accelerating or decelerating, it should pass through these speed ranges as quickly as possible to prevent or at least limit damage to the machine.

[0009] It goes without saying that it would be more desirable to design a machine so that these vibration problems do not occur or occur only to a very limited extent.

[0010] This requires adjustments to the dynamic characteristics of the rotor, which are primarily determined by the stiffness of its shaft and / or the stiffness of the bearings by means of which the shaft is rotatably mounted in the machine.

[0011] Because the construction and assembly of the machine requires the rotor to have strict dimensions, the possibilities for adjusting the stiffness of the shaft are very limited. Therefore, adjusting the stiffness of the bearing by appropriate sizing is usually the more obvious choice, as long as any restrictions on the size of the bearing allow.

[0012] Because vibration problems can never be completely eliminated, it is recommended that the bearing be provided with some damping properties to ensure that the vibrations occurring in the bearing are limited to acceptable levels.

[0013] Fluid bearings are known which, due to the presence of a fluid film between the outer ring and the shaft, already have damping properties and allow the shaft to rotate at very high speeds, which makes them very suitable for use in turbines.

[0014] However, fluid bearings generate higher energy losses than roller bearings. Furthermore, above a certain limiting speed of the shaft, fluid bearings may exhibit unstable behavior, in which the center point of the shaft moves eccentrically in the fluid bearing. Such unstable behavior can be very detrimental to the machine, especially for example in screw compressor or screw expander elements, in which the clearance between the rotor and the housing surrounding it is usually very small and must be kept within a narrow spacing to avoid frictional contact between the rotor and the housing.

[0015] Due to the potentially unstable behavior of fluid bearings, roller bearings are also often used. Roller bearings do not have a fluid film that would lead to radial eccentric displacements of the shaft, thereby allowing the gap between the housing and the rotor of the machine to be selected smaller when roller bearings are used for the bearing of the shaft. However, such roller bearings exhibit no or very poor damping properties for vibrations in the machine. For this reason, roller bearings are often used in combination with so-called damping elements.

[0016] In this context, WO 2016 / 022875 describes a screw compressor in which radial and axial roller bearings are used to maintain the radial and axial position of the rotor in the screw compressor, and in which a viscous fluid is used to damp vibrations of the rotor. In this context, it may be useful to use a lubricant already used in a screw compressor as a viscous fluid to seal the gap between the rotors. The viscous fluid is enclosed in a squeeze film damper arranged in parallel with respect to the radial or axial roller bearings, thereby providing viscous damping of the vibrations.

[0017] In this way, the squeeze film damper in WO 2016 / 022875 works similarly to a fluid bearing, wherein the aforementioned unstable behavior is avoided by the roller bearings. However, energy losses still occur in the squeeze film damper.

[0018] In US 11,041,495, a squeeze film damper for a positive displacement compressor is described, which is arranged in series with respect to a roller bearing. However, it is a standard squeeze film damper, whose stiffness is determined by an elastic O-ring which also seals the viscous fluid in the squeeze film damper.

[0019] However, this stiffness is not sufficient to damp any displacement of the rotors in the screw element. As a result, the mutual clearance between the rotors or the clearance between the rotors on the one hand and the housing of the screw element on the other hand cannot be kept within narrow intervals, resulting in inefficient operation and possible damage to the screw element.

[0020] In US Pat. No. 5,421,655, US Pat. No. 5,531,522 or US Pat. No. 5,603,574, a squeeze film damper is described, the stiffness of which is not determined by elastic O-rings.

[0021] The squeeze film damper is designed as a preferably one-piece ring structure, which comprises an inner ring and an outer ring surrounding it, wherein the inner ring and the outer ring are integrally connected to each other via an intermediate structure having a plurality of slots extending through the ring structure in an axial direction parallel to the rotational symmetry axis of the inner ring.

[0022] The one-piece ring construction allows the squeeze film damper to be installed more easily and accurately in the machine by avoiding the inevitable tolerance stack-up of multi-component construction.

[0023] The outer ring of the ring structure is fixed to the supporting object, while the inner ring is fixed to the roller bearing, so that the squeeze film damper is arranged in series with respect to the roller bearing.

[0024] A disadvantage of the squeeze film dampers described in US 5,421,655, US 5,531,522 and US 5,603,574 is that they are difficult to install in certain applications due to their inconveniently large and inflexible one-piece ring structure.

[0025] As a solution to this disadvantage, US Pat. No. 5,421,655, US Pat. No. 5,531,522 or US Pat. No. 5,603,574 propose to divide the ring structure of the squeeze film damper into two halves.

[0026] However, by designing the ring structure as a multi-part structure in this manner, the ring structure can be fixed in the machine with less accuracy due to tolerance stack-up than when the ring structure is designed as a single-piece structure as explained above. Utility Model Content

[0027] The present invention aims to solve at least one of the above disadvantages and / or other disadvantages.

[0028] More specifically, the present invention aims to provide a damping element for a bearing that can be installed in a machine, in particular an element for compressing or expanding a gas, in a precise and simple, quick and flexible manner.

[0029] Another object of the present invention is to provide a simple, quick and flexible way to fix a bearing to a supporting object in a machine.

[0030] Furthermore, the invention aims to effectively damp the vibrations of a rotor mounted in a rotor bearing in an element for compressing or expanding gas.

[0031] To this end, the utility model relates to a damping element for a bearing,

[0032] The damping element comprises a ring structure, the ring structure comprising an inner ring and an outer ring surrounding the inner ring,

[0033] wherein the inner ring and the outer ring are connected by an intermediate structure having a plurality of slots extending through the ring structure in an axial direction parallel to the rotational symmetry axis of the inner ring,

[0034] wherein the damping element is configured to secure the inner ring to the bearing,

[0035] Characterized in that the damping element is further configured to fix the annular side of the outer ring laterally along the axis of rotational symmetry to the support object.

[0036] An advantage of the present invention is that the damping element can be precisely fixed to the supporting object in a simple manner, for example, by means of a plurality of screws passing through a plurality of axial through screw holes in the outer ring along the axis of rotational symmetry, wherein the screws can be fastened on the free side of the outer ring opposite to the annular side and facing away from the annular side.

[0037] Since the damping element according to the present invention can be laterally fixed to the supporting object, the concentricity between the outer ring of the ring structure on the one hand and the hole in the supporting object for the rotor on the other hand can be easily controlled during the installation of the damping element on the supporting object, and the radial displacement of the rotor relative to the supporting object will be damped by the damping element.

[0038] This makes the damping element very suitable for mounting the bearing in elements for compressing or expanding gases, such as screw compressor or screw expander elements, in which the mutual clearances between the rotors on the one hand and the housing of the element on the other hand must be kept within narrow spacings.

[0039] In a preferred embodiment of the damping element according to the present invention, the damping element comprises a groove, and each of the slots is provided with at least one fluid connection connected to the groove, the fluid connection being used to convey the viscous fluid between the groove and the slot.

[0040] In this way, the viscous fluid may flow into and out of the slots, providing a damping effect of the viscous fluid in the slots relative to any displacement or vibration of the bearing which may be fixed to the inner ring.

[0041] The groove is preferably provided with a supply line for the viscous fluid.

[0042] Any leakage of the viscous fluid that may occur at the damping element can be corrected by supplying new viscous fluid into the groove via the supply line.

[0043] In another preferred embodiment of the damping element according to the present invention, the damping element further comprises a lubricant supply device for supplying lubricant to the bearing.

[0044] In this way, the bearing lubrication function can be integrated into the damping element, and there is no need to provide a separate lubricant supply for lubricating the bearing in the machine close to the damping element.

[0045] Furthermore, the lubricant with which the bearing is lubricated can then be conducted as a viscous fluid via a supply line into the groove.

[0046] The lubricant supply device is preferably provided with a nozzle having a diameter not exceeding 1.0 mm for spraying the lubricant onto the bearing.

[0047] This allows the bearing to be lubricated in a very even manner.

[0048] In yet another preferred embodiment of the damping element according to the present invention, the damping element is configured to provide a locking plate to a second annular side of the ring structure facing away from the above-mentioned annular side of the outer ring, the locking plate being used to seal the slot on the second annular side.

[0049] By means of the locking plate, the slot in the middle structure of the ring structure can be sealed to prevent viscous fluid from leaking out of the slot on the second ring side without installing an elastic O-ring in the slot which would negatively reduce the stiffness of the damping element.

[0050] In this embodiment, the stiffness of the damping element can be largely determined by the force of the bearing on the viscous fluid in the slot and the associated static displacements of the inner ring relative to the outer ring. These static displacements can be limited by fixing the inner ring relative to the outer ring in a radial direction perpendicular to the axis of rotational symmetry by a locking plate.

[0051] By radially fixing the inner ring relative to the outer ring by means of the locking plate, the damping element can achieve twice the damping compared to a damping element without such a locking plate.

[0052] This allows the intermediate structure of the damping element to be designed with a smaller axial thickness along the axis of rotational symmetry, thereby achieving a minimum level of damping than would be achieved if the ring structure of the damping element could not be radially fixed to the locking plate.

[0053] This means a reduction in the amount of material used to produce the damping element and in the material costs.

[0054] In another preferred embodiment of the damping element of the present invention, the damping element comprises a detection device for measuring or receiving a relative displacement value between the inner ring and the outer ring in a radial direction perpendicular to the rotational symmetry axis.

[0055] Based on this value, the fixation of the locking plate on the damping element can be adjusted.

[0056] Preferably, the locking plate is configured to prevent further relative displacement of the inner ring with respect to the outer ring in the radial direction when the measured or received value of the relative displacement exceeds a predetermined threshold value.

[0057] Thus, the locking plate can be used to prevent the intermediate structure from being excessively deformed due to excessive compression of the slots by the radial bearing forces on the inner ring. Such excessive deformation of the intermediate structure may result in frictional contact between the support object and the rotor mounted in the support object via the bearing, which may result in damage to the support object and / or the rotor.

[0058] Furthermore, the utility model relates to an element for compressing or expanding gas, the element comprising:

[0059] - a housing, the housing comprising:

[0060] -- an inlet side, which is provided with a gas inlet;

[0061] -- an internal space, which is used to compress or expand the gas, respectively; and

[0062] - an outlet side, which has an outlet for the compressed or expanded gas in the interior space, wherein the outlet side faces away from the inlet side,

[0063] - The rotor in the inner space;

[0064] - a rotor bearing for rotationally fixing the rotor relative to the housing; and

[0065] - rotor bearing damping elements,

[0066] It is characterized in that

[0067] - the rotor bearing damping element is a damping element according to one of the above-described embodiments;

[0068] - the rotor bearing damping element and the rotor bearing are configured to fix the inner ring to the rotor bearing as a bearing; and

[0069] The rotor bearing damping element and the housing are configured to fix the annular side of the outer ring laterally along the axis of rotational symmetry to the housing as a supporting object.

[0070] It goes without saying that such an element has the same advantages as the above-described embodiments of the damping element according to the invention.

[0071] In a preferred embodiment of the element according to the invention, the rotor bearing is a roller bearing.

[0072] This allows the clearance between the rotor on the one hand and the housing of the element on the other hand to be kept within narrow intervals or, if the element comprises a plurality of rotors, the mutual clearances between the rotors of the element to be kept within narrow intervals. This ensures efficient operation of certain machines, such as screw compressor elements or screw expander elements.

[0073] In a further preferred embodiment of the element according to the invention, the element is a screw element having a screw rotor as rotor.

[0074] Preferably, the rotor bearing is located on the inlet side in this case.

[0075] Typically, the bearing forces in the screw element on the inlet side will be smaller than the bearing forces on the outlet side, so that the rotor bearing damping element of the rotor bearing on the inlet side requires a lower damper stiffness than a possible second damping element of the second rotor bearing on the outlet side. Damping elements with a lower damper stiffness are generally easier to manufacture than damping elements with a higher damper stiffness.

[0076] In a further preferred embodiment of the element according to the invention, the intermediate structure with the slot of the rotor bearing damping element is preferably dimensioned such that the ratio between the radial damper stiffness of the rotor bearing damping element and the radial bearing stiffness of the rotor bearing is greater than 0.6, preferably 0.7.

[0077] This high ratio between the radial damper stiffness of the rotor bearing damping element and the radial bearing stiffness of the rotor bearing makes the rotor bearing damping element very suitable for mounting the rotor bearing in elements for compressing or expanding gases, for example in screw compressor elements or screw expander elements, in which the mutual clearances between the rotors on the one hand or the clearances between the rotors on the other hand and the housing of the element have to be kept within narrow spacings.

[0078] The radial damper stiffness of the rotor bearing damping element may be increased by reducing the radial dimension of the slots viewed from the rotational symmetry axis and / or by increasing the axial thickness of the intermediate structure along the rotor bearing damping element and / or by reducing the mutual tangential overlap of the slots viewed from the rotational symmetry axis.

[0079] In a further preferred embodiment of the element according to the invention, the intermediate structure with the slot of the rotor bearing damping element is dimensioned such that the damping ratio for deflections of the rotor relative to the housing radially relative to the axis of rotational symmetry is greater than 5.0%.

[0080] Here, "damping ratio" is a well-known measure for damping a vibration, and more specifically, is the ratio of the damping rate of a vibration relative to the angular frequency of the vibration, where a damping ratio of 0% means that the vibration is not damped. The damping rate of a vibration is the inverse of the time constant of the vibration, where the time constant of a vibration is the time required for the amplitude of the vibration to decrease by a factor equal to the Euler number.

[0081] This high damping ratio makes the rotor bearing damping element very suitable for mounting the rotor bearing in elements for compressing or expanding gases, for example in screw compressor elements or screw expander elements, in which the mutual clearance between the rotors or the clearance between the rotors on the one hand and the housing of the element on the other hand must be kept within narrow spacings.

[0082] The damping ratio can be increased by reducing the radial dimension of the slots viewed from the rotational symmetry axis and / or by increasing the axial thickness of the intermediate structure along the rotor bearing damping element and / or by reducing the mutual tangential overlap of the slots viewed from the rotational symmetry axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to better illustrate the features of the present invention, the following describes several preferred applications of a damping element for a bearing and an element for compressing or expanding a gas according to the present invention by way of examples without any limiting features, with reference to the accompanying drawings, wherein:

[0084] Figure 1 A damping element for a bearing according to the utility model is shown;

[0085] Figure 2 A partial longitudinal cross-sectional view of an element for compressing or expanding gas according to the present invention is shown;

[0086] Figure 3 In more detail, the Figure 2 The part indicated by F3 in ; and

[0087] Figure 4 Shown according to Figure 3 of perspective Figure 1 An alternative embodiment of the damping element in . DETAILED DESCRIPTION

[0088] Figure 1 is a view of a damping element 1 for a bearing 2 according to the present invention.

[0089] The damping element 1 comprises a ring structure 3 which comprises an inner ring 4 and an outer ring 5 surrounding the inner ring.

[0090] The inner ring 4 and the outer ring 5 are connected by an inner ring 6 having a plurality of slots 7. These slots 7 extend through the ring structure 3 in an axial direction parallel to an axis of rotational symmetry 8 of the inner ring 4.

[0091] The slot 7 can be arranged in the ring structure 3 in the following manner:

[0092] - forming a hole through the ring structure 3 in the axial direction by drilling, laser drilling and / or die-cutting EDM; and

[0093] - Slots are formed between the holes by wire EDM or abrasive wire cutting 7.

[0094] The damping element 1 is configured to secure the inner ring 4 to the bearing 2 .

[0095] Furthermore, the damping element 1 is configured such that the annular side of the outer ring 5 (in this case Figure 1 The rear side of the middle outer ring 5 is laterally fixed to a supporting object along the rotational symmetry axis 8 .

[0096] In this case, the outer ring 5 is provided with a plurality of through-going screw holes 9 in the axial direction along the rotational symmetry axis 8. Screws can be screwed into these screw holes 9 on the free side of the outer ring 5, which is opposite to and facing away from the annular side (in this case, the outer ring 5), in order to fix the outer ring 5 to the support object. Figure 1 The front side of the inner and outer rings 5).

[0097] As a result, the damping element 1 can be used to mount the bearing 2 on a supporting object, wherein

[0098] - the outer ring 5 is fixed to a supporting object; and

[0099] - The inner ring 4 is fixed on the bearing 2.

[0100] By mounting the bearing 2 on a supporting object using the damping element 1 , vibration of the shaft supported in the bearing 2 relative to the supporting object can be damped by the viscous fluid in the slot 7 .

[0101] In this case, the damping element 1 further comprises a lubricant supply device 10 for supplying lubricant to the bearing 2 .

[0102] In this case, the lubricant supply device 10 is preferably provided with a nozzle having a diameter not greater than 1.0 mm for spraying the lubricant as fine droplets onto the bearing 2 (not shown in the drawings).

[0103] In this case, the damping element 1 is also configured to provide a locking plate for closing the slot 7 on a second annular side of the ring structure 3 facing away from the aforementioned annular side of the outer ring 5 .

[0104] In this case, the second annular side (in this case, Figure 1The front side of the ring structure 3 in the locking plate is provided with a plurality of bore holes 11 in the axial direction along the rotational symmetry axis 8. When the locking plate is provided with a plurality of through circular holes corresponding to the bore holes 11, screws can pass through the circular holes and be screwed into the bore holes 11 on the free side of the locking plate to fix the locking plate to the ring structure 3.

[0105] The damping element 1 may include a detection device for measuring or receiving a relative displacement value between the inner ring 4 and the outer ring 5 in a radial direction perpendicular to the rotational symmetry axis 8 (not shown in the drawings).

[0106] In this case, the locking plate is configured to prevent further relative displacement of the inner ring 4 with respect to the outer ring 5 in the radial direction when the measured or received value of the relative displacement exceeds a predetermined threshold value.

[0107] Figure 2 A partial longitudinal cross section of an element 12 for compressing or expanding a gas according to the invention is shown.

[0108] The element 12 comprises a housing 13 having:

[0109] - an inlet side 14 provided with an inlet 15 for the gas;

[0110] - an internal space 16 for compressing or expanding the gas, respectively; and

[0111] An outlet side 17 having an outlet 18 for the compressed or expanded gas in the interior 16 , wherein the outlet side 17 faces away from the inlet side 14 .

[0112] Furthermore, the element 12 comprises a rotor 19 which is located in the interior space 16 for compressing or expanding the gas in the interior space 16 , a rotor bearing 20 for rotatably fixing the rotor 19 relative to the housing 13 , and a rotor bearing damping element 21 .

[0113] In this case, the rotor bearing damping element 21 is as follows Figure 1 The damping element 1 is shown.

[0114] In this case, the rotor bearing damping element 21 and the rotor bearing 20 are configured to fix the inner ring 4 to the rotor bearing 20 .

[0115] In this case, the rotor bearing 20 is a roller bearing.

[0116] Furthermore, the rotor bearing damping element 21 and the housing 13 are configured to fix the annular side of the outer ring 5 laterally along the rotational symmetry axis 8 to the housing 13 as a supporting object.

[0117] Results, such as Figure 1As shown, the damping element 1 can be used as a rotor bearing damping element 21 in the element 12 to install the rotor bearing 20 as the bearing 2 in the housing 13 as the supporting object, wherein

[0118] - the outer ring 5 is fixed to the housing 13; and

[0119] - The inner ring 4 is fixed to the rotor bearing 20 .

[0120] By using the damping element 1 as a rotor bearing damping element 21 for mounting the rotor bearing 20 on the housing 13 , vibration of the rotor 19 supported in the rotor bearing 20 relative to the housing 13 can be damped by the viscous fluid in the slot 7 .

[0121] In this case, the element 12 is a screw element having a screw rotor as rotor 19 , and the rotor bearing 20 is located on the inlet side 14 .

[0122] However, within the scope of the invention it is not excluded that the elements are elements of different types and / or that the rotor bearing is located on the outlet side.

[0123] The intermediate structure 6 with the slots 7 of the rotor bearing damping element 21 is preferably configured in such a way that

[0124] - a ratio between the radial damper stiffness of the rotor bearing damping element 21 and the radial bearing stiffness of the rotor bearing 20 is greater than 0.6, preferably 0.7; and / or

[0125] The damping ratio for a deflection of the rotor 19 relative to the housing 13 radially relative to the axis of rotational symmetry 8 is greater than 5.0%.

[0126] The radial damper stiffness and the damping ratio of the rotor bearing damping element 21 can be increased by reducing the radial dimensions of the slots 7 viewed from the rotational symmetry axis 8 and / or by increasing the axial thickness of the intermediate structure 6 along the rotor bearing damping element 8 and / or by reducing the tangential overlap of the slots 7 viewed from the rotational symmetry axis 8.

[0127] Figure 3 In more detail, the Figure 2 The part represented by F3.

[0128] exist Figure 3 It can be seen that the damping element 1 in the form of a rotor bearing damping element 21 comprises a groove 22 and each of the slots 7 is provided with at least one fluid connection 23 connected to the groove 22 for conveying a viscous fluid between the groove 22 and the slot 7 .

[0129] In this case, the groove 22 is provided with a supply line 24 for the viscous fluid so as to be able to replenish any loss of viscous fluid from the slot 7 due to leakage.

[0130] As a result, the damping element 1 can be used as a rotor bearing damping element 21 in the element 12 to damp the movement of the rotor 19 relative to the housing 13 as a supporting object, wherein the damping is a result of:

[0131] - fixing the outer ring 5 of the damping element 1 to the housing 13 as a supporting object;

[0132] - fixing the inner ring 4 of the damping element 1 to the rotor bearing 20 as the bearing 2; and

[0133] - The damping effect of the viscous liquid with which the slot 7 is filled.

[0134] If the viscous fluid in the slot 7 is an oil of the same composition as the lubricant for the rotor bearing 20, the rotor bearing 20 can be lubricated and the slot 7 can be filled or refilled from the same fluid reservoir or fluid supply (not shown).

[0135] Figure 4 Shown according to Figure 3 of perspective Figure 1 An alternative embodiment of the damping element in .

[0136] In this alternative embodiment, the second annular side of the ring structure 3 is provided with an annular locking plate 25 for sealing the slot 7 on the second annular side and potentially preventing excessive relative displacement between the inner ring 4 and the outer ring 5 .

[0137] The invention is in no way limited to the damping elements and elements described by way of example and shown in the drawings, but damping elements and elements according to the invention can be realized in various forms and sizes without exceeding the scope of protection of the invention defined in the claims.

Claims

1. A damping element for a bearing, The damping element (1) comprises a ring structure (3), wherein the ring structure (3) comprises an inner ring (4) and an outer ring (5) surrounding the inner ring. wherein the inner ring (4) and the outer ring (5) are connected via an intermediate structure (6) having a plurality of slots (7), the slots (7) extending through the ring structure (3) in an axial direction parallel to an axis of rotational symmetry (8) of the inner ring (4), wherein the damping element (1) is configured to fix the inner ring (4) to the bearing (2), It is characterized in that The damping element (1) is also configured to fix the annular side of the outer ring (5) laterally along the rotational symmetry axis (8) to a supporting object.

2. The damping element for a bearing according to claim 1, characterized in that The damping element (1) comprises a groove (22), and wherein each of the slots (7) is provided with at least one fluid connection (23) connected to the groove (22), the fluid connection being used to convey a viscous fluid between the groove (22) and the slot (7).

3. The damping element for a bearing according to claim 2, characterized in that: The groove (22) is provided with a supply line (24) for the viscous fluid.

4. The damping element for a bearing according to any one of the preceding claims 1 to 3, wherein the damping element (1) further comprises a lubricant supply device (10) for supplying lubricant to the bearing (2).

5. The damping element for a bearing according to claim 4, characterized in that: The lubricant supply device (10) is provided with a nozzle with a diameter not exceeding 1.0 mm, and the nozzle is used to spray the lubricant onto the bearing (2).

6. A damping element for a bearing according to any one of the preceding claims 1 to 3, characterized in that The damping element (1) is configured to provide a locking plate (25) to a second annular side of the ring structure (3) facing away from the above-mentioned annular side of the outer ring (5), the locking plate being used to seal the slot (7) on the second annular side.

7. A damping element for a bearing according to any one of the preceding claims 1 to 3, characterized in that The damping element (1) comprises a detection device for measuring or receiving a value of a relative displacement between the inner ring (4) and the outer ring (5) in a radial direction perpendicular to the rotational symmetry axis (8).

8. The damping element for a bearing according to claim 6, characterized in that: The damping element (1) comprises a detection device for measuring or receiving a value of a relative displacement between the inner ring (4) and the outer ring (5) in a radial direction perpendicular to the rotational symmetry axis (8), and wherein the locking plate (25) is configured to prevent further relative displacement of the inner ring (4) relative to the outer ring (5) in the radial direction when the measured or received value of the relative displacement exceeds a predetermined threshold value.

9. An element for compressing or expanding gas, the element for compressing or expanding gas comprising: - a housing (13), said housing comprising: - an inlet side (14) provided with an inlet (15) for the gas; - an inner space (16), the inner space being used for compressing or expanding the gas, respectively; as well as - an outlet side (17) having an outlet (18) for compressed or expanded gas in the interior space (16), wherein the outlet side (17) faces away from the inlet side (14), - a rotor (19) in said inner space (16); - a rotor bearing (20) for rotatably fixing the rotor (19) relative to the housing (13); and - rotor bearing damping element (21), It is characterized in that - the rotor bearing damping element (21) is a damping element (1) according to any one of the preceding claims 1 to 8; - the rotor bearing damping element (21) and the rotor bearing (20) are configured to fix the inner ring (4) to the rotor bearing (20) as a bearing (2); and - The rotor bearing damping element (21) and the housing (13) are configured to fix the annular side of the outer ring (5) laterally along the rotational symmetry axis (8) to the housing (13) as a support object.

10. The element for compressing or expanding gas according to claim 9, characterized in that The rotor bearing (20) is a roller bearing.

11. Element for compressing or expanding gas according to claim 9 or 10, characterized in that The element (12) is a screw element having a screw rotor as rotor (19).

12. The element for compressing or expanding gas according to claim 11, characterized in that The rotor bearing (20) is located on the inlet side (14).

13. The element for compressing or expanding gas according to claim 9 or 10, characterized in that The intermediate structure (6) with the slot (7) of the rotor bearing damping element (21) is dimensioned such that the ratio between the radial damper stiffness of the rotor bearing damping element (21) and the radial bearing stiffness of the rotor bearing (20) is greater than 0.

6.

14. The element for compressing or expanding gas according to claim 13, characterized in that The intermediate structure (6) with the slot (7) of the rotor bearing damping element (21) is dimensioned such that the ratio between the radial damper stiffness of the rotor bearing damping element (21) and the radial bearing stiffness of the rotor bearing (20) is greater than 0.

7.

15. The element for compressing or expanding gas according to claim 11, characterized in that The intermediate structure (6) with the slot (7) of the rotor bearing damping element (21) is dimensioned such that the damping ratio for deflections of the rotor (19) relative to the housing (13) radially relative to the rotational symmetry axis (8) is greater than 5.0%.

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