CN114110016A - Thrust bearing and bearing assembly - Google Patents
Thrust bearing and bearing assembly Download PDFInfo
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- CN114110016A CN114110016A CN202111451761.5A CN202111451761A CN114110016A CN 114110016 A CN114110016 A CN 114110016A CN 202111451761 A CN202111451761 A CN 202111451761A CN 114110016 A CN114110016 A CN 114110016A
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- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000011295 pitch Substances 0.000 description 56
- 238000007667 floating Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
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- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/042—Sliding-contact bearings for exclusively rotary movement for axial load only with flexible leaves to create hydrodynamic wedge, e.g. axial foil bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
Abstract
The application provides a thrust bearing and a bearing assembly, relates to the technical field related to thrust bearings, and is used for solving the problem that the service life of the thrust bearing is short due to the fact that free edges such as the inner edge and the outer edge of a top foil and the area close to the free edges are abraded. The thrust bearing comprises a bottom plate, at least one bump foil and at least one top foil, wherein the at least one bump foil is arranged on one side of the bottom plate and comprises an inner edge foil, a main foil and an outer edge foil which are sequentially arranged along the radial direction of the thrust bearing, and the rigidity of the inner edge foil and the rigidity of the outer edge foil are smaller than that of the main foil; at least one top foil is arranged on one side of the wave foil far away from the bottom plate.
Description
Technical Field
The application relates to the technical field of thrust bearings, in particular to a thrust bearing and a bearing assembly.
Background
The bearing is an essential basic component in a rotating machine, and common bearings include a rolling bearing, a sliding bearing, a magnetic suspension bearing and the like. Along with the development of science and technology, people put forward higher requirements on the aspects of oillessness, high precision and the like of a bearing, an air floating bearing is produced, and the air floating bearing has wide application prospects in high-speed rotating machinery such as a turbocharger, an air circulator, an air compressor, a micro gas turbine, a turboshaft engine and the like due to the characteristics of high working speed, oilless lubrication, small friction loss and the like.
The air floating thrust bearing generally includes a base plate, a wave foil and a top foil, the wave foil and the top foil are circumferentially mounted on the base plate by a connection method such as welding or screw fastening, one ends of the top foil and the wave foil are fixed to the base plate, the other ends of the top foil and the wave foil are free ends, the top foils are arranged to face a thrust plate of a rotating shaft, and the top foils are arranged at an inclination angle with respect to the thrust plate, whereby a bearing gap between the thrust plate and the top foil is formed in a wedge shape in a side view. That is, the bearing gap is narrowed from the upstream side to the downstream side in the rotation direction of the thrust disk (rotating shaft). When the rotor works, with the increase of the rotating speed, under the action of the inclination angle, gas with certain viscosity in the surrounding environment is brought into a wedge-shaped channel between the top foil and the thrust disc, and a high-pressure gas film is formed to enable the thrust disc to be separated from the top foil to generate thrust, and the corrugated foil plate has a special corrugated structure and plays a role of elastic support and is a main source of the rigidity and the damping of the thrust bearing.
However, due to the influence of the manufacturing process accuracy, the flatness of the free edge such as the inner edge (the region close to the radially inner side) and the outer edge (the region close to the radially outer side) of the top foil is poor, and the free edge has burrs after cutting, so that the gas film of the free edge is not easily formed. Furthermore, when the rotor is started or impacted, the free edges of the top foil, such as the inner edge and the outer edge, and the area close to the free edges are abraded, and when the abrasion is accumulated to a certain degree, the thrust bearing is burnt and stuck, so that the service life of the thrust bearing is shortened.
Disclosure of Invention
The application provides a thrust bearing and a bearing assembly, which aim to solve the problem that the service life of the thrust bearing is short due to the fact that free edges such as the inner edge and the outer edge of a top foil and the area close to the free edges are abraded.
To achieve the above object, in a first aspect, the present application provides a thrust bearing comprising:
a base plate;
the bump foil is arranged on one side of the bottom plate and comprises an inner edge foil, a main foil and an outer edge foil which are sequentially arranged along the radial direction of the thrust bearing, wherein the rigidity of the inner edge foil and the rigidity of the outer edge foil are smaller than that of the main foil; and
and the top foil is arranged on one side of the wave foil, which is far away from the bottom plate.
In some embodiments of the present application, the base plate has a mounting through-hole;
the thrust bearing includes a plurality of the bump foils provided on the bottom plate around the mounting through-hole;
the thrust bearing includes a plurality of the top foils disposed on the corresponding bump foils around the mounting through-holes.
In some embodiments of this application, the bottom plate is circular bottom plate, the installation through-hole is located the centre of a circle position of bottom plate, ripples foil with top foil all is fan-shaped, ripples foil supports correspondingly top foil, every fan-shaped ripples foil all includes along the bottom plate radially set gradually the inner edge foil piece main foil piece with the outer edge foil piece.
In some embodiments of the present application, the stiffness of the inner edge foil increases gradually from a radially inner side of the inner edge foil to a radially outer side of the inner edge foil, and/or the stiffness of the outer edge foil decreases gradually from a radially inner side of the outer edge foil to a radially outer side of the outer edge foil.
In some embodiments of the present application, the inner rim foil includes a plurality of inner foils disposed in a radial direction of the inner rim foil, and a stiffness of the plurality of inner foils increases gradually from a radially inner side of the inner rim foil to a radially outer side of the inner rim foil.
In some embodiments of the present application, the outer edge foil includes a plurality of outer foils disposed along a radial direction of the outer edge foil, and a rigidity of the plurality of outer foils is gradually reduced from a radially inner side of the outer edge foil to a radially outer side of the outer edge foil.
In some embodiments of the present application, a length L2 of the main foil in a radial direction and a total length L of the bump foil in the radial direction satisfy: l2 is (0.6-0.8) L.
In some embodiments of the present application, the length L1 of the inner edge foil in the radial direction and the length L3 of the outer edge foil in the radial direction satisfy: l1 ═ L3 ═ L-L2)/2.
In some embodiments of the present application, the length L1 of the inner edge foil in the radial direction and the length L3 of the outer edge foil in the radial direction satisfy: l1+ L3 ≠ L-L2, and L1 ≠ L3.
In some embodiments of the present application, the thickness D1 of the inner edge foil, the thickness D2 of the main foil, and the thickness D3 of the outer edge foil satisfy: d1 is (0.3-0.7) D2, and D3 is (0.3-0.7) D2.
In some embodiments of the present application, the inner foil, the main foil, and the outer foil are configured to be formed of a corrugated-plate-shaped wave foil having wave crest portions and wave trough portions alternately arranged, and a wave pitch of the inner foil and a wave pitch of the outer foil are each greater than or equal to 1.5 times a wave pitch of the main foil and are each less than or equal to 3 times a wave pitch of the main foil.
In some embodiments of the application, a surface of the top foil on a side remote from the flexible foil is coated with an abrasion resistant coating.
In some embodiments of the present application, the top foil, the wave foil and the bottom plate are connected by welding or by a screw fastening connection.
In a second aspect, the present application also provides a bearing assembly comprising:
the thrust bearing;
the rotor comprises a rotating shaft and a thrust disc, the rotating shaft is arranged in the mounting through hole in a penetrating mode, and the thrust disc protrudes out of the rotating shaft towards the radial outer side of the rotating shaft;
wherein a top foil of the thrust bearing is disposed to face the thrust disk.
Compared with the prior art, the bump foil in the application comprises an inner edge foil, a main foil and an outer edge foil which are sequentially arranged along the radial direction of the thrust bearing, namely the inner edge foil, the main foil and the outer edge foil are spliced to form the bump foil to support the top foil, meanwhile, as the rigidity of the inner edge foil and the rigidity of the outer edge foil are both smaller than that of the main foil, the thrust bearing has different bearing rigidity, the adaptability of the thrust bearing to different rotating speeds of a rotor is improved, the reliability of the thrust bearing is improved, meanwhile, the supporting rigidity of the bump foil to the top foil in the areas (the free edge and the area close to the free edge) corresponding to the inner edge foil and the outer edge foil on the top foil is weakened, so that the friction force of the areas is reduced, therefore, the friction damage accumulation rate of the area near the free edge of the top foil is delayed, and the service life of the air floating thrust bearing is prolonged.
Furthermore, the bearing assembly provided by the application comprises the thrust bearing, so that the bearing assembly provided by the application can achieve the same technical effects as the thrust bearing.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a thrust bearing in an embodiment of the present application;
FIG. 2 is a schematic structural view of a bump foil in a thrust bearing according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a thrust bearing according to an embodiment of the present invention, in which the wave foils are multiple fan-shaped wave foils, and an inner foil of one of the fan-shaped wave foils includes two inner foils and an outer foil includes two outer foils;
FIG. 4 is a schematic structural diagram of a thrust bearing according to an embodiment of the present invention in which the wave pitches of the inner edge foil, the outer edge foil and the main foil are different.
The main reference numbers in the drawings accompanying the present specification are as follows:
1-top foil; 11-a vacant section; 12-a working section; 2-wave foil; 21-inner edge foil; 22-a main foil; 23-outer edge foil; 24-a stationary section; 25-a corrugated section; and 3, a bottom plate.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The thrust bearing provided by the present application is a multi-piece air floating thrust bearing that typically combines with a rotor to form a bearing assembly.
The thrust bearing comprises a top foil 1, a wave foil 2 and a bottom plate 3, wherein installation through holes are formed in the top foil, the wave foil and the bottom plate along the axial direction, a rotor comprises a rotating shaft and a thrust disc, the rotating shaft penetrates through the installation through holes, the thrust disc protrudes out of the rotating shaft towards the radial outer side of the rotating shaft, the thrust bearing is sleeved on the rotating shaft, and the top foil 1 of the thrust bearing and the thrust disc are oppositely arranged.
It will be appreciated that the side surface of the top foil 1 facing away from the bump foil 2 is arranged opposite the thrust disk.
The structure of the thrust bearing in the present application will be described in more detail below.
FIG. 1 is a schematic structural view of a thrust bearing in an embodiment of the present application; FIG. 2 is a schematic structural diagram of a bump foil in a thrust bearing according to an embodiment of the present invention. Referring to fig. 1 and 2, the thrust bearing includes a bottom plate 3, at least one bump foil 2 and at least one top foil 1, the bump foil 2 is disposed on one side of the bottom plate 3, the bump foil 2 includes an inner edge foil 21, a main foil 22 and an outer edge foil 23 sequentially disposed along a radial direction of the thrust bearing, wherein the rigidity of the inner edge foil 21 and the rigidity of the outer edge foil 23 are both less than the rigidity of the main foil 22, and the top foil 1 is disposed on one side of the bump foil 2 away from the bottom plate 3.
Compared with the prior art, the bump foil 2 in the present application includes the inner edge foil 21, the main foil 22 and the outer edge foil 23 which are sequentially arranged along the direction from the center to the edge of the bottom plate 3, that is, the inner edge foil 21, the main foil 22 and the outer edge foil 23 are spliced to form the bump foil to support the top foil 1 corresponding thereto, and meanwhile, because the stiffness of the inner edge foil 21 and the stiffness of the outer edge foil 23 are all less than the stiffness of the main foil 22, the thrust bearing has different bearing stiffness, the adaptability of the thrust bearing to different rotation speeds of the rotor is improved, the reliability of the thrust bearing is improved, the supporting stiffness of the bump foil 2 on the top foil 1 at the region (the free edge and the region close to the free edge) corresponding to the inner edge foil 21 and the outer edge foil 23 on the top foil 1 is weakened, the friction force of the region is reduced, and the friction damage accumulation rate of the region close to the free edge of the top foil 1 is delayed, the service life of the air floating thrust bearing is prolonged.
With continued reference to fig. 1 and 2, the base plate 3 has a mounting through-hole; a plurality of the bump foils 2 are arranged on the bottom plate 3 around the mounting through hole; the top foil 1 has a plurality of top foils 1 arranged on the corresponding bump foils 2 around the mounting through-holes. Therefore, when the bump foil 2 and/or the top foil 1 in a certain area of the bottom plate 3 is damaged, only the bump foil 2 and/or the top foil 1 in the area need to be replaced, and the maintenance cost of the thrust bearing is reduced.
The bottom plate 3 is a circular bottom plate, the mounting through hole is located at the position of the circle center of the bottom plate 3, the wave foil 2 and the top foil 1 are both in a fan shape, the wave foil 2 supports the corresponding top foil 1, and each fan-shaped wave foil 2 comprises the inner edge foil 21, the main foil 22 and the outer edge foil 23 which are sequentially arranged along the radial direction of the bottom plate 3, so that the inner edge area and the free edge position of the outer edge area of the fan-shaped top foil 1 corresponding to the fan-shaped wave foil 2 are not easily abraded.
It is understood that the inner rim foil 21 is adjacent to the mounting through-hole of the base plate 3, the outer rim foil 23 is adjacent to the outer edge of the base plate 3, and the main foil 22 is located between the inner rim foil 21 and the outer rim foil 23. Namely, the bump foil 2 comprises an inner edge foil 21, a main foil 22 and an outer edge foil 23 which are positioned at the same central angle and have sequentially increased radius, and the inner edge foil 21, the main foil 22 and the outer edge foil 23 are spliced together to form the bump foil 2 so as to support one corresponding top foil 1.
The base plate 3 is usually made of a metal material; the top foil 1 is generally made of a sheet material having a large elastic modulus such as stainless steel. The end face of the base plate 3 opposite the thrust disk is a working face, and the working face is configured as a flat face or an inclined face. The bump foil 2, the top foil 1 are arranged between the working surface and the thrust disc, and the bump foil 2 is arranged between the top foil 1 and the working surface of the bottom plate 3. The base plate 3, the bump foil 2, and the top foil 1 are stacked in the axial direction of the rotation shaft of the rotor. The fan foil 2 is disposed on the fan support area of the base plate 3. Meanwhile, the bump foil 2 is formed slightly smaller than or equal to the top foil 1 in a plan view, and it is also understood that the bump foil 2 is covered with the top foil 1 on the bottom plate 3.
In some embodiments of the present application, the stiffness of the inner edge foil 21 gradually increases from the radially inner side of the inner edge foil 21 to the radially outer side of the inner edge foil 21, and/or the stiffness of the outer edge foil 23 gradually decreases from the radially inner side of the outer edge foil 23 to the radially outer side of the outer edge foil 23, so that the stiffness of the inner edge foil 21 and/or the outer edge foil 23 changes more gradually, and unstable operation of the thrust bearing due to abrupt change of stiffness is avoided.
Fig. 3 is a schematic structural view illustrating that the wave foil 2 in the thrust bearing of the embodiment of the present application is a plurality of fan-shaped wave foils, and the inner edge foil 21 of one of the fan-shaped wave foils 2 includes two inner foils, and the outer edge foil 23 includes two outer foils, referring to fig. 3, in order to achieve the gradual increase of the stiffness of the inner edge foil 21 toward the radial outer side, the inner edge foil 21 includes a plurality of inner foils arranged along the radial direction of the inner edge foil 21, and the stiffness of the plurality of inner foils gradually increases from the radial inner side of the inner edge foil 21 to the radial outer side of the inner edge foil 21. In fig. 3, an example is shown in which the inner edge foil 21 includes two inner foils located at the same central angle and having successively increasing radii, but the inner foils may be two, three or four. The specific number of foils is not limited in this application.
Wherein, the inner foils with different rigidity can be a one-piece integral structure or a multi-piece splicing structure.
Similarly, in order to realize that the rigidity of the outer edge foil 23 is gradually reduced from the radially inner side of the outer edge foil 23 to the radially outer side of the outer edge foil 23, the outer edge foil 23 includes a plurality of outer foils arranged in the radial direction of the outer edge foil 23, and the rigidity of the plurality of outer foils is gradually reduced from the radially inner side of the outer edge foil 23 to the radially outer side of the outer edge foil 23. In fig. 3, an example is shown in which the outer edge foils 23 include two outer foils located at the same central angle and having successively increasing radii, but the outer foils may be two, three or four. The specific number of foils is not limited in this application. Similarly, the outer foils with different rigidities can be a one-piece integral structure or a multi-piece spliced structure.
It will be appreciated that the number of inner and outer foils may or may not be equal.
For example, when there is a difference in actual wear conditions of the inner edge area and the outer edge area of the top foil 1 of the thrust bearing, different numbers of inner foils and outer foils are provided, and similarly, the main foil 22 may be divided in the same manner as the inner edge foil 21 and the outer edge foil 23 according to the support rigidity of the thrust bearing.
Hereinafter, specific structures of the inner foil 21, the main foil 22, and the outer foil 23 will be described in more detail.
The main foil 22 is a corrugated support sheet made of a sheet material having a high elastic modulus such as stainless steel, and is attached to the base plate 3 in a connection manner such as welding or screwing, and plays a main supporting role. The inner edge foil 21 and the outer edge foil 23 are generally formed as a wave-shaped support piece using a sheet material having a large elastic modulus such as stainless steel, and are attached to the base plate 3 by a connection method such as welding or screwing, and play a secondary support role. The elastic modulus parameter of the main foil 22 is larger than that of the inner and outer foils 21 and 23.
In order to ensure that the main foil piece 22 is able to provide sufficient support to the top foil 1, while ensuring that the wear of the inner and outer edge regions of the top foil 1 is reduced, the length L2 in the radial direction of the main foil piece 22 and the total length L in the radial direction of the bump foil 2 satisfy: l2 is (0.6-0.8) L.
Due to the length L2 > (0.8 × L) of the main foil 22 in the radial direction, the area of the supporting region of the main foil 22 is large, which results in a small area for disposing the inner edge foil 21 and the outer edge foil 23, i.e., the wear prevention effect of the inner edge foil 21 and the outer edge foil 23 is poor, and there is a possibility that wear may occur on the top foil 1 in the thrust bearing.
If the length L2 < (0.6 × L) of the main foil 22 in the radial direction is smaller, the area of the supporting region of the main foil 22 is smaller, which may result in insufficient support of the top foil 1 by the bump foil 2.
In some embodiments, the main foil 22 has a length L2 ═ 0.6 × L, L2 ═ 0.62 × L, L2 ═ 0.65 × L, L2 ═ 0.68 × L, L2 ═ 0.7 × L, L2 ═ 0.75 × L, L2 ═ 0.78 × L, or L2 ═ 0.8 × L in the radial direction.
Note that, the above data of the proportional relationship between the length L2 of the main foil 22 in the radial direction and the total length L of the bump foil 2 in the radial direction is only a part of the data, and not all the data of the proportional relationship between the length L2 of the main foil 22 in the radial direction and the total length L of the bump foil 2 in the radial direction are data.
Typically, the worn areas of the inner and outer edges of the top foil 1 are substantially the same size in the radial direction, whereby the length L1 in the radial direction of the inner edge foil 21 and the length L3 in the radial direction of the outer edge foil 23 in the present application satisfy: l1 ═ L3 ═ L-L2)/2.
It should be noted that, the inner edge foil 21 further includes a plurality of inner foils located at the same central angle and having successively increasing radii, and the plurality of inner foils have gradually increasing rigidity toward the radial outer side; and the outer edge foil 23 includes a plurality of outer foils located at the same central angle and having successively increasing radii, and the stiffness of the plurality of outer foils gradually decreases toward the radially outer side, the "length L1 of the inner edge foil 21 in the radial direction" refers to the sum of the lengths of the plurality of inner foils in the radial direction, and the "length L3 of the outer edge foil 23 in the radial direction" refers to the sum of the lengths of the plurality of outer foils in the radial direction.
Further, the plurality of inner foils may be equal or different in length in the radial direction, and for example, when the top foil 1 has a large size in the radial direction in a severely worn region of a portion of the inner edge region near the free edge, the size in the radial direction of the inner foil closest to the radially outer side among the inner foils may be maximized. Similarly, the lengths of the plurality of outer foils in the radial direction may be equal or different.
In summary, it is sufficient to ensure that the sum of the lengths of the plurality of inner foils in the radial direction is equal to the length L1 of the inner edge foil 21 in the radial direction, and the sum of the lengths of the plurality of outer foils in the radial direction is equal to the length L2 of the outer edge foil 23 in the radial direction.
However, due to the influence of mounting errors and manufacturing accuracy, the radial dimensions of the worn areas of the inner and outer edges of the top foil 1 may be different, and thus the length L1 in the radial direction of the inner edge foil 21 and the length L3 in the radial direction of the outer edge foil 23 satisfy: l1+ L3 ≠ L-L2, and L1 ≠ L3.
Wherein, the length L1 of the inner edge foil 21 in the radial direction and the length L3 of the outer edge foil 23 in the radial direction can be adjusted adaptively according to the actual situation.
The above stiffness may be understood as a pressure resistance, a pressure absorption, a deformation resistance, a support stiffness, and various ways to realize that the stiffness of the inner and outer edge foils 21 and 23 is lower than that of the main foil 22, and three ways that may be implemented by those skilled in the art are described below.
The first embodiment:
the thickness D1 of the inner edge foil 21, the thickness D2 of the main foil 22, and the thickness D3 of the outer edge foil 23 satisfy: d1 is (0.3-0.7) D2, and D3 is (0.3-0.7) D2. That is, by reducing the thickness D1 of the inner edge foil 21 (referring to the thickness of the sheet from which the inner edge foil 21 is made) and the thickness D3 of the outer edge foil 23 (referring to the thickness of the sheet from which the outer edge foil 23 is made), the rigidity of the inner edge foil 21 and the outer edge foil 23 is lower than that of the main foil 22.
Wherein the thickness D1 > (0.7 × D2) of the inner edge foil 21 and the thickness D3 > (0.7 × D2) of the outer edge foil 23 are very close to each other in stiffness of the inner edge foil 21, the outer edge foil 23 and the main foil 22, which is not favorable for reducing the wear of the inner edge region and the outer edge region of the top foil 1. If the thickness D1 < (0.3X D2) of the inner edge foil 21 and the thickness D3 < (0.3X D2) of the outer edge foil 23 are smaller, the rigidity of the inner edge foil 21 and the outer edge foil 23 will be very small, and there will be substantially no load bearing capacity, which will affect the load bearing capacity of the thrust bearing.
In some embodiments, the thickness D1 ═ 0.35 × D2, D1 ═ 0.37 × D2, D1 ═ 0.4 × D2, D1 ═ 0.45 × D2, D1 ═ 0.48 × D2, D1 ═ 0.5 × D2, D1 ═ 0.52 × D2, D1 ═ 0.53 × D2, D1 ═ 0.55 × D2, D1 ═ 0.57 × D2, D1 ═ 0.6 × D2, D1 ═ 0.63 × D2, D1 ═ 0.65 × D2, or D1 ═ 0.68 × D2 of the inner edge foil 21.
In some embodiments, the thickness D3 of the outer edge foil 23 is (0.35 × D2), D3 is (0.36 × D2), D2 is (0.37 × D2), D2 is (0.4 × D2), D2 is (0.42 × D2), D2 is (0.45 × D2), D2 is (0.48 × D2), D2 is (0.5 × D2), D2 is (0.52 × D2), D2 is (0.53 × D2), D2 is (0.55 × D2), D2 is (0.57 × D2), D2 is (0.6 × D2), D2 is (0.63 × D2), D2 is (0.65 × D2), or D2 is (0.6 × D2).
Note that, the above data of the proportional relationship between the thickness D1 of the inner edge foil 21 and the thickness D2 of the main foil 22 are only some examples, and not all data of the proportional relationship between the thickness D1 of the inner edge foil 21 and the thickness D2 of the main foil 22 are included. Similarly, the data of the proportional relationship between the thickness D3 of the outer edge foil 23 and the thickness D2 of the main foil 22 are only some, and not all of the data of the proportional relationship between the thickness D3 of the outer edge foil 23 and the thickness D2 of the main foil 22.
Wherein, the main foil 22, the inner edge foil 21 and the outer edge foil 23 are made of sheets with the same thickness, and at least one layer of support foil is stacked on the upper side and/or the lower side of the main foil 22 to improve the rigidity of the main foil 22.
Alternatively, the main foil 22, the inner edge foil 21, and the outer edge foil 23 are made of sheets with different thicknesses, that is, the main foil 22 is made of a sheet with a thicker thickness, and the inner edge foil 21 and the outer edge foil 23 are made of a sheet with a thinner thickness than the main foil 22.
The second embodiment:
the inner foil 21, the main foil 22, and the outer foil 23 are configured to be formed of corrugated-plate-shaped wave foils 2 having wave crest portions and wave trough portions alternately arranged, and both the wave pitch of the inner foil 21 and the wave pitch of the outer foil 23 are greater than or equal to 1.5 times the wave pitch of the main foil 22 and less than or equal to 3 times the wave pitch of the main foil 22.
In some embodiments, the wave pitch of the inner foil 21 is equal to 1.5 times the wave pitch of the main foil 22, the wave pitch of the inner foil 21 is equal to 1.6 times the wave pitch of the main foil 22, the wave pitch of the inner foil 21 is equal to 1.7 times the wave pitch of the main foil 22, the wave pitch of the inner foil 21 is equal to 1.8 times the wave pitch of the main foil 22, the wave pitch of the inner foil 21 is equal to 1.85 times the wave pitch of the main foil 22, the wave pitch of the inner foil 21 is equal to 2 times the wave pitch of the main foil 22, the wave pitch of the inner foil 21 is equal to 2.5 times the wave pitch of the main foil 22, or the wave pitch of the inner foil 21 is equal to 3 times the wave pitch of the main foil 22.
Further, the wave pitch of the outer edge foil 23 is equal to 1.5 times the wave pitch of the main foil 22, the wave pitch of the outer edge foil 23 is equal to 1.6 times the wave pitch of the main foil 22, the wave pitch of the outer edge foil 23 is equal to 1.7 times the wave pitch of the main foil 22, the wave pitch of the outer edge foil 23 is equal to 1.8 times the wave pitch of the main foil 22, the wave pitch of the outer edge foil 23 is equal to 1.85 times the wave pitch of the main foil 22, the wave pitch of the outer edge foil 23 is equal to 2 times the wave pitch of the main foil 22, the wave pitch of the outer edge foil 23 is equal to 2.5 times the wave pitch of the main foil 22, or the wave pitch of the outer edge foil 23 is equal to 3 times the wave pitch of the main foil 22.
Note that, the data of the proportional relationship between the wave pitch of the inner foil 21 and the wave pitch of the main foil 22 is only a part of the data, and not all of the data of the proportional relationship between the wave pitch of the inner foil 21 and the wave pitch of the main foil 22 are listed. Similarly, the data of the proportional relationship between the wave pitch of the outer edge foil 23 and the wave pitch of the main foil 22 is only a part of the data, and not all of the data of the proportional relationship between the wave pitch of the outer edge foil 23 and the wave pitch of the main foil 22.
Similarly, if the wave pitch of the inner edge foil 21 and the wave pitch of the outer edge foil 23 are smaller than 1.5 times the wave pitch of the main foil 22, the stiffness of the inner edge foil 21, the stiffness of the outer edge foil 23 and the stiffness of the main foil 22 will be very close to each other, which is not favorable for reducing the wear of the inner edge area and the outer edge area of the top foil 1. If the wave pitch of the inner edge foil 21 and the wave pitch of the outer edge foil 23 are greater than 3 times the wave pitch of the main foil 22, the stiffness of the inner edge foil 21 and the outer edge foil 23 will be very small and have substantially no bearing capacity, thereby affecting the bearing capacity of the thrust bearing.
It is understood that the wave pitches of the inner and outer edge foils 21 and 23 may be equal or unequal.
Third embodiment:
the inner edge foil 21, the main foil 22 and the outer edge foil 23 are made of materials with different elastic moduli, and specifically, the elastic modulus parameters of the inner edge foil 21 and the outer edge foil 23 are smaller than the elastic modulus parameter of the main foil 22, so that the rigidity of both the inner edge foil 21 and the outer edge foil 23 is smaller than the rigidity of the main foil 22.
In some embodiments of the present application, in order to increase the wear resistance of the surface of the top foil 1 on the side facing the thrust disk, a wear resistant coating is applied on the surface of the top foil 1 on the side facing away from the bump foil 2.
Illustratively, the wear-resistant coating can be a polytetrafluoroethylene coating or a molybdenum disulfide coating.
In some embodiments of the present application, the top foil 1, the wave foil 2 and the bottom plate 3 are connected by welding or screw fastening.
It will be appreciated that the top foil 1 comprises an active section 12 close to the idle section 11 and remote from the idle section 11, and the corresponding wave foil 2 comprises a fixed section 24 corresponding to the idle section 11 and a corrugated section 25 corresponding to the active section 12, as shown in fig. 1 and 2. The space segment 11 and the fixing segment 24 are fixed on the bottom plate 3 by rivets or screws, or the space segment 11 and the fixing segment 24 are fixed on the bottom plate 3 by spot welding.
Referring to fig. 1 to 4, since the thrust bearing includes 6 bump foils 2 and 6 top foils 1, respectively, the thrust bearing is also formed in correspondence with the bump foils 2 and the top foils 1 in 6 sector-shaped support regions of the bottom plate 3. However, the number of the bump foils 2 and the top foil 1 may be 5 or less, or 7 or more, for example, 8 or 10. In this case, the number of fan-shaped support areas is also adjusted in correspondence with the number of bump foils 2 or top foils 1.
For the embodiment that "the top foil 1 and the wave foil 2 are both in a fan shape, the wave foil 2 has a plurality of pieces and is arranged along the circumferential direction of the bottom plate 3, and each piece of the wave foil 2 is provided with one top foil 1", each top foil 1 includes an occupied section 11 and a working section 12 far away from the occupied section 11, and the wave foil 2 corresponding to the top foil 1 includes a fixed section 24 corresponding to the occupied section 11 and a corrugated section 25 corresponding to the working section 12. Wherein the extending direction of the space segment 11 coincides with the radial direction of the top foil 1, and the extending direction of the fixed segment 24 coincides with the radial direction of the bump foil 2. The end of the working section 12 remote from the occupying section 11 is a free end, the free end of one fan-shaped top foil 1 is close to the occupying section 11 of another fan-shaped top foil 1 adjacent to the fan-shaped top foil 1, and so on.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims. In addition, the principle and the implementation manner of the present application are explained by applying specific examples in the specification, the above description of the embodiments is only for helping understanding the method and the core idea of the present application, and the content of the present application should not be construed as limiting the present application.
Claims (14)
1. A thrust bearing, comprising:
a base plate;
the bump foil is arranged on one side of the bottom plate and comprises an inner edge foil, a main foil and an outer edge foil which are sequentially arranged along the radial direction of the thrust bearing, wherein the rigidity of the inner edge foil and the rigidity of the outer edge foil are smaller than that of the main foil; and
and the top foil is arranged on one side of the wave foil, which is far away from the bottom plate.
2. The thrust bearing of claim 1, wherein said bottom plate has a mounting through-hole;
the thrust bearing includes a plurality of the bump foils provided on the bottom plate around the mounting through-hole;
the thrust bearing includes a plurality of the top foils disposed on the corresponding bump foils around the mounting through-holes.
3. The thrust bearing of claim 2, wherein the bottom plate is a circular bottom plate, the mounting through hole is located at a center of the bottom plate, the bump foils and the top foil are fan-shaped, the bump foils support the corresponding top foil, and each fan-shaped bump foil comprises the inner edge foil, the main foil and the outer edge foil which are sequentially arranged along a radial direction of the bottom plate.
4. The thrust bearing of claim 3, wherein the stiffness of the inner edge foil increases from a radially inner side of the inner edge foil to a radially outer side of the inner edge foil, and/or the stiffness of the outer edge foil decreases from a radially inner side of the outer edge foil to a radially outer side of the outer edge foil.
5. The thrust bearing of claim 4, wherein the inner rim foil includes a plurality of inner foils disposed in a radial direction of the inner rim foil, and a rigidity of the plurality of inner foils increases from a radially inner side of the inner rim foil to a radially outer side of the inner rim foil.
6. The thrust bearing of claim 4, wherein said outer rim foil includes a plurality of outer foils disposed along a radial direction of said outer rim foil, and a rigidity of the plurality of outer foils is gradually decreased from a radially inner side of said outer rim foil to a radially outer side of said outer rim foil.
7. The thrust bearing of claim 3, wherein a length L2 in a radial direction of the main foil and a total length L in the radial direction of the bump foil satisfy: l2 is (0.6-0.8) L.
8. The thrust bearing of claim 7, wherein a length L1 in a radial direction of the inner edge foil and a length L3 in the radial direction of the outer edge foil satisfy: l1 ═ L3 ═ L-L2)/2.
9. The thrust bearing of claim 7, wherein a length L1 in a radial direction of the inner edge foil and a length L3 in the radial direction of the outer edge foil satisfy: l1+ L3 ≠ L-L2, and L1 ≠ L3.
10. The thrust bearing of any of claims 1 to 9, wherein the thickness D1 of the inner edge foil, the thickness D2 of the main foil and the thickness D3 of the outer edge foil satisfy: d1 is (0.3-0.7) D2, and D3 is (0.3-0.7) D2.
11. The thrust bearing according to any one of claims 1 to 9, wherein the inner edge foil, the main foil, and the outer edge foil are arranged to be formed of corrugated-plate-shaped corrugated foils having crest portions and trough portions alternately arranged, and a wave pitch of the inner edge foil and a wave pitch of the outer edge foil are each greater than or equal to 1.5 times a wave pitch of the main foil and are each less than or equal to 3 times a wave pitch of the main foil.
12. Thrust bearing according to claim 1, characterized in that the surface of the top foil on the side remote from the bump foil is coated with a wear-resistant coating.
13. Thrust bearing according to claim 1, characterized in that the connection between the top foil, the wave foil and the bottom plate is a welded or screwed connection.
14. A bearing assembly, comprising:
a thrust bearing as claimed in any one of claims 1 to 13;
the rotor comprises a rotating shaft and a thrust disc, the rotating shaft is arranged in the mounting through hole in a penetrating mode, and the thrust disc protrudes out of the rotating shaft towards the radial outer side of the rotating shaft;
wherein a top foil of the thrust bearing is disposed to face the thrust disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111451761.5A CN114110016A (en) | 2021-12-01 | 2021-12-01 | Thrust bearing and bearing assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111451761.5A CN114110016A (en) | 2021-12-01 | 2021-12-01 | Thrust bearing and bearing assembly |
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| CN114110016A true CN114110016A (en) | 2022-03-01 |
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| CN202111451761.5A Pending CN114110016A (en) | 2021-12-01 | 2021-12-01 | Thrust bearing and bearing assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027289A1 (en) * | 2022-07-30 | 2024-02-08 | 广东美的暖通设备有限公司 | Axial bearing, compressor, and heating and ventilation equipment |
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