CN112343917A - Dynamic pressure gas bearing - Google Patents
Dynamic pressure gas bearing Download PDFInfo
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- CN112343917A CN112343917A CN202011328967.4A CN202011328967A CN112343917A CN 112343917 A CN112343917 A CN 112343917A CN 202011328967 A CN202011328967 A CN 202011328967A CN 112343917 A CN112343917 A CN 112343917A
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- sliding
- foil
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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
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Fluid Mechanics (AREA)
- Support Of The Bearing (AREA)
Abstract
The application relates to the technical field of gas bearings, and provides a dynamic pressure gas bearing which comprises a bearing sleeve, a top foil and at least two supporting foils, wherein the top foil is arranged in the bearing sleeve and used for forming a gas film gap with a rotor; two ends of the top foil are respectively arranged on the bearing sleeves; the supporting foil is of a straight sheet structure, one end of the supporting foil in the circumferential direction after being bent is installed on the bearing sleeve, and the other end of the supporting foil is suspended in the air; the supporting foil is provided with a plurality of sliding beams in a hollow-out mode, each sliding beam is provided with two sliding ends, and each sliding end can be supported on the inner wall of the bearing sleeve and can slide on the inner wall of the bearing sleeve after the supporting foil is bent. According to the dynamic pressure gas bearing, one end of the supporting foil is fixed after the supporting foil is installed in a bending mode, the other end of the supporting foil is arranged in a suspension mode, the supporting foil has pretightening force for the top foil due to elastic deformation, the pretightening force improves the rigidity and the damping characteristic of the supporting foil, and the rigidity and the bearing capacity of the whole dynamic pressure gas bearing are improved.
Description
Technical Field
The application belongs to the technical field of gas bearings, and particularly relates to a dynamic pressure gas bearing.
Background
The gas bearing is generally used in high-speed and ultrahigh-speed rotating machinery, the working principle of the gas bearing is similar to that of an oil film bearing, but the gas bearing is different from the oil film bearing in that the bearing and a lubricating medium of the gas bearing are gases, so that the gas bearing has no pollution of oil stains and the like in the working environment, is relatively simple to maintain, can adapt to higher temperature, and has extremely low running resistance under a high-speed working condition. Gas bearings can be divided into two major categories, static pressure gas bearings and dynamic pressure gas bearings. Compared with a static pressure gas bearing, the dynamic pressure gas bearing does not need to additionally provide a high-pressure gas source and has the advantages of simple structure, small size and the like, so that the dynamic pressure gas bearing is widely applied to the fields of micro gas turbines, micro turbojet engines and the like.
A wedge gap or other special form of gap exists between the hydrodynamic gas bearing and the rotor, in which gap aerodynamic pressure is generated when the rotor rotates. The hydrodynamic gas bearing includes a bearing housing, which typically has an elastic support structure, such as a foil structure, therein to improve the stability of the rotor system, and when subjected to an unstable load, the foil structure generates relative sliding due to deformation to generate coulomb friction. However, the structural damping of the conventional hydrodynamic gas bearing is still insufficient, and the bearing capacity and stability of the hydrodynamic gas bearing are still to be improved.
Disclosure of Invention
An object of the embodiment of the present application is to provide a dynamic pressure gas bearing, in order to solve the technical problem that the bearing capacity and stability of the dynamic pressure gas bearing existing in the prior art still need to be improved.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: providing a dynamic pressure gas bearing, which comprises a bearing sleeve, a top foil and at least two supporting foils, wherein the top foil is arranged in the bearing sleeve and is used for forming a gas film gap with a rotor; two ends of the top foil are respectively arranged on the bearing sleeves; the supporting foil is of a straight sheet structure, one end of the supporting foil in the circumferential direction after being bent is mounted on the bearing sleeve, and the other end of the supporting foil is suspended in the air; the supporting foil is provided with a plurality of sliding beams in a hollow-out mode, each sliding beam is provided with two sliding ends, and each sliding end can be supported on the inner wall of the bearing sleeve and can slide on the inner wall of the bearing sleeve after the supporting foil is bent.
In a possible embodiment, each of the sliding beams is distributed along a first direction and a second direction, the first direction is set to be an axial direction after the supporting foil is installed, and the second direction is set to be a circumferential direction after the supporting foil is installed;
the sliding beam comprises a connecting arm and two sliding arms, the two sliding arms are symmetrically arranged on two sides of the connecting arm along the second direction, one end of each sliding arm is connected with the connecting arm, and the other end of each sliding arm is the sliding end.
In a possible embodiment, the width of the sliding arm in the first direction gradually increases from the sliding end to the connecting arm;
wherein, the sliding arm is trapezoidal or arc.
In a possible embodiment, a plurality of sets of first sliding beams are distributed on the supporting foil, and each set of first sliding beams is distributed at intervals along the first direction and the second direction respectively; the first sliding beam group comprises at least two sliding beams which are distributed at intervals along the first direction, connecting arms of two adjacent sliding beams in the same first sliding beam group are connected, and the connecting positions are separated from the supporting foil sheet to form two symmetrically-arranged sliding arms.
In a possible embodiment, a plurality of second sliding beam sets are distributed on the supporting foil, and each second sliding beam set is distributed at intervals along the first direction and the second direction respectively; the second sliding beam group comprises at least two sliding beams, wherein the at least two sliding beams are respectively a first sliding beam and at least one second sliding beam; the first sliding beam comprises two first sliding arms, the second sliding beam comprises two second sliding arms, and each second sliding arm is correspondingly nested in the two first sliding arms.
In a possible embodiment, the two second sliding arms of the second sliding beam are formed on the two first sliding arms of the first sliding beam, respectively; when two or more second sliding beams are formed in the first sliding beam, the second sliding beams are distributed at intervals along the first direction.
In a possible embodiment, at least one second sliding beam is distributed on each first sliding arm of the first sliding beams, and when the number of the second sliding beams is two or more, the second sliding beams are distributed at intervals along the first direction.
In a possible embodiment, the width of the first sliding beam and the width of the second sliding beam in the same second sliding beam group have a first ratio, and the first ratio gradually increases from two sides to the middle along the first direction.
In a possible embodiment, two adjacent first sliding beams in the first direction are offset from each other along the second direction and are arranged at least partially crosswise.
In a possible embodiment, the number of layers of the support foil in the radial direction of the hydrodynamic gas bearing is at least one; when the number of the layers of the supporting foils is two or more, the supporting foils are sequentially stacked from inside to outside, the sliding beams on the supporting foils on the inner side sequentially penetrate through the supporting foils on the outer side and can be supported on the inner wall of the bearing sleeve and slide on the inner wall of the bearing sleeve, and the lengths of the sliding beams stacked in the supporting foils are sequentially reduced from inside to outside along the radial direction.
The application provides a hydrodynamic gas bearing's beneficial effect lies in: according to the dynamic pressure gas bearing provided by the embodiment of the application, at least two pieces of supporting foils are distributed between the bearing sleeve and the top foil, the supporting foils are of a straight sheet structure, one end of each supporting foil is fixed after the supporting foils are bent and installed, the other end of each supporting foil is arranged in a suspension mode, and meanwhile the supporting foils are arranged to be the supporting foils with the sliding beams, so that the supporting foils always have pretightening force on the top foil due to elastic deformation after being installed, the pretightening force improves the rigidity and the damping characteristic of the supporting foils, and the rigidity and the bearing capacity of the whole dynamic pressure gas bearing are improved. In addition, when the dynamic pressure gas bearing bears load, the load acts on the top foil, the top foil transmits force to the supporting foil, the supporting foil generates further micro deformation, the sliding beam generates bending, the contact area of the sliding beam and the bearing sleeve is increased, the sliding end of the sliding beam generates sliding on the inner wall of the bearing sleeve, coulomb friction damping is formed, and the supporting stability of the dynamic pressure gas bearing to the load is further improved.
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 embodiments or the prior art descriptions will be briefly described 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 inventive exercise.
Fig. 1 is a schematic perspective view of a hydrodynamic gas bearing according to an embodiment of the present invention;
FIG. 2 is an axial schematic view of the hydrodynamic gas bearing of FIG. 1;
FIG. 3 is an exploded view of the hydrodynamic gas bearing of FIG. 1;
FIG. 4 is a schematic structural view of the bearing housing of FIG. 1;
FIG. 5 is a schematic diagram of the top foil of FIG. 1;
FIG. 6 is a schematic view of the support foil of FIG. 1 prior to assembly;
FIG. 7 is a schematic view of the assembled support foil of FIG. 1;
FIG. 8 is a schematic structural diagram of a supporting foil according to a second embodiment of the present application;
FIG. 9 is a schematic structural diagram of a supporting foil according to a third embodiment of the present application;
FIG. 10 is a schematic structural diagram of a supporting foil according to a fourth embodiment of the present application;
fig. 11 is a schematic view of fig. 10 showing only the first slide arm of the first slide beam abutting the inner wall of the bearing housing;
fig. 12 is a schematic view of the state in which the first sliding arm and the second sliding arm are both abutted against the inner wall of the bearing housing in fig. 10;
FIG. 13 is a schematic structural diagram of a support foil according to a fifth embodiment of the present application;
FIG. 14 is a schematic structural diagram of a support foil according to an embodiment of the present application;
FIG. 15 is a schematic diagram illustrating a transition state of each sliding beam of the two layers of support foils abutting against the inner wall of the bearing housing according to a seventh embodiment of the present invention;
fig. 16 is a schematic diagram illustrating a transition state of each sliding beam of the three-layered support foil abutting against an inner wall of the bearing housing according to a seventh embodiment of the present application.
Wherein, in the figures, the respective reference numerals:
10. a bearing housing; 11. a first mounting groove; 12. a second mounting groove; 20. a support foil; 21. a main body frame; 22. a first bent portion; 23. a sliding beam; 231. a slide arm; 2311. a sliding end; 232. a connecting arm; m, a first sliding beam group; n, a second sliding beam group; 23a, a first sliding beam; 23b, a second sliding beam; 231a, a first sliding arm; 231b, a second sliding arm; 2311a, a first sliding end; 2311b, a second sliding end; 24. a through groove; 30. a top foil; 31. a carrier; 32. a second bent portion; x, a first direction; y, second direction.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.
Furthermore, 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 specifically limited otherwise.
Referring to fig. 1 to 3, a dynamic pressure gas bearing according to an embodiment of the present invention will now be described.
The dynamic pressure gas bearing comprises a bearing sleeve 10, a top foil 30 and at least two supporting foil pieces 20 which are distributed at intervals along the circumferential direction. The bearing housing 10 is cylindrical, the top foil 30 is installed in the bearing housing 10, the top foil 30 forms a gas film gap with the rotor, and at least two pieces of support foil pieces 20 are supported between the bearing housing 10 and the top foil 30.
The top foil 30 is mounted at both ends thereof to the bearing housing 10, respectively. The supporting foil 20 is a straight sheet structure, one end of the supporting foil 20, which is bent and arranged along the circumferential direction, is mounted on the bearing sleeve 10, and the other end is suspended. The supporting foil 20 is hollowed to form a plurality of sliding beams 23, that is, the supporting foil 20 includes a main body frame 21 and a plurality of sliding beams 23 formed on the main body frame 21, the sliding beams 23 have two sliding ends 2311, and each sliding end 2311 can be supported on the inner wall of the bearing housing 10 and slide on the inner wall of the bearing housing 10 after the supporting foil 20 is bent.
The support foil 20 of the present application has a flat sheet structure before installation, after installation, the support foil 20 is bent by an external force, the main frame 21 of the support foil 20 is in contact with the top foil 30, and due to the elastic deformation of the main frame 21, the sliding beam 23 does not extend on the curved surface formed by the main frame 21 but extends from the main frame 21 in the opposite direction to the bending of the main frame 21, that is, in the direction of the bearing housing 10, and the sliding end 2311 of the sliding beam 23 extends from the main frame 21 in the direction of the bearing housing 10 and abuts against the inner wall of the bearing housing 10. In addition, due to the elastic deformation of the main body frame 21 and the suspended arrangement of one end of the main body frame 21, the main body frame 21 is not completely attached to the top foil 30 after being installed, but has a certain supporting pretightening force for the top foil 30, and the pretightening force enables the supporting foil 20 to have a supporting force for the top foil 30 even when no load exists, so that the rigidity and the damping performance of the supporting foil 20 can be provided, and the rigidity and the bearing capacity of the whole dynamic pressure gas bearing are further improved.
In the dynamic pressure gas bearing in the embodiment, at least two pieces of supporting foils 20 are distributed between the bearing sleeve 10 and the top foil 30, the supporting foils 20 are in a straight sheet structure before installation, one end of each supporting foil 20 is fixed after bending installation, the other end of each supporting foil 20 is arranged in a suspended mode, and the supporting foils 20 are arranged into the supporting foils 20 with the sliding beams 23, so that the supporting foils 20 always have pre-tightening force on the top foil 30 due to elastic deformation after installation, the pre-tightening force improves the rigidity and the damping characteristic of the supporting foils 20, and the rigidity and the bearing capacity of the whole dynamic pressure gas bearing are improved. In addition, when the dynamic pressure gas bearing is loaded, the load acts on the top foil 30, the top foil 30 transmits force to the support foil 20, further small deformation of the support foil 20 is generated, the sliding beam 23 is bent, the contact area of the sliding beam 23 and the bearing housing 10 is increased, and the sliding end 2311 of the sliding beam 23 slides on the inner wall of the bearing housing 10, coulomb friction damping is formed, and the support stability of the dynamic pressure gas bearing to the load is further improved.
Referring to fig. 1 to 3, the hydrodynamic gas bearing includes a top foil 30 and three support foils 20. The top foil 30 is cylindrical, and both ends of the top foil 30 are respectively mounted on the inner wall of the bearing housing 10. The three supporting foil pieces 20 are equally spaced between the bearing sleeve 10 and the top foil 30 along the circumferential direction of the bearing sleeve 10, one end of each supporting foil piece 20 is installed on the inner wall of the bearing sleeve 10 after assembly, and the other end of each supporting foil piece 20 is arranged between the bearing sleeve 10 and the top foil 30 in a hanging manner. It should be understood that, in other embodiments of the present application, the number of the top foils 30 may be more than one, and the number of the support foils 20 may be two or more than three, according to the actual design, as long as the number of the top foils 30 is less than the number of the support foils 20, so as to ensure that the top foils 30 can generate sufficient pre-tightening force after the support foils 20 are assembled in a bending manner, which is not limited herein.
Referring to fig. 4, the inner wall of the bearing housing 10 is formed with three first mounting grooves 11 and two second mounting grooves 12, the three first mounting grooves 11 are respectively used for mounting one ends of three supporting foils 20, and the two second mounting grooves 12 are respectively used for mounting two ends of a top foil 30. Wherein the number of the first mounting grooves 11 may be changed according to the number of the support foil pieces 20, and the number of the second mounting grooves 12 may be changed according to the number of the top foil pieces 30.
Referring to fig. 4 and 6, the first mounting groove 11 is rectangular and penetrates the bearing housing 10 along the axial direction. The support foil 20 is a flat sheet-shaped structure extending along a first direction X and a second direction Y, respectively, and when the support foil 20 is bent and installed in the bearing housing 10, the first direction X is an axial direction of the support foil 20, and the second direction Y is a circumferential direction of the support foil 20. One end of the support foil 20 along the first direction X is bent to form a first bent portion 22, the first bent portion 22 extends along the first direction X, and when the support foil is installed, the first bent portion 22 is axially inserted into the first installation groove 11 to form a connection between the support foil 20 and the bearing housing 10.
Referring to fig. 4 and 5, the second mounting groove 12 is rectangular and axially penetrates through the bearing housing 10, the top foil 30 includes a supporting body 31 and two second bending portions 32, the supporting body 31 is cylindrical and has an opening, the two second bending portions 32 are formed at two ends of the supporting body 31 along the circumferential direction, the second bending portions 32 axially penetrate through the supporting body 31, and during mounting, the second bending portions 32 are axially inserted into the second mounting groove 12 to form connection between the top foil 30 and the bearing housing 10.
Wherein, in order to reduce the number of the slots in the bearing housing 10, one of the first mounting grooves 11 is combined with one of the second mounting grooves 12. Of course, in other embodiments of the present application, the first installation groove 11 and the second installation groove 12 may be separately provided.
Referring to fig. 6, a plurality of through grooves 24 are hollowed out in the support foil 20, the number of the through grooves 24 is equal to the number of the sliding beams 23, and each sliding beam 23 is formed in one through groove 24.
In a specific embodiment, referring to fig. 6 and 7, the sliding beams 23 are distributed along a first direction X and a second direction Y, respectively, the first direction X being an axial direction after the mounting of the support foil 20, and the second direction Y being a circumferential direction after the mounting of the support foil 20. The sliding beam 23 includes a connecting arm 232 and two sliding arms 231, and the two sliding arms 231 are symmetrically disposed on two sides of the connecting arm 232 along the second direction Y. Both ends of the connecting arm 232 are connecting ends, and both ends of the connecting arm 232 are respectively connected with the through grooves 24 integrally along the inner walls of both sides in the first direction X. One end of the sliding arm 231 is connected to the connecting arm 232, and the other end of the sliding arm 231 is the sliding end 2311, that is, the other end of the sliding arm 231 is suspended and can be supported on the inner wall of the bearing housing 10 and can slide on the inner wall of the bearing housing 10, so as to form coulomb friction.
In a specific embodiment, referring to fig. 6, the width of the sliding arm 231 in the first direction X gradually increases from the sliding end 2311 to the connecting arm 232, which is beneficial to improve the elasticity and damping characteristics of the sliding end 2311, so that the sliding end 2311 slides on the inner wall of the bearing housing 10 to generate coulomb friction.
Referring to fig. 6, the sliding arm 231 is trapezoidal, and has a simple structure and is convenient to process.
In a specific embodiment, the width of the sliding beam 23 gradually increases from two sides to the middle along the first direction X, that is, the sliding beams 23 of the support foil 20 at different axial positions have different widths, so that the rigidity of the support foil 20 is non-uniformly distributed in the axial direction, and the actual film pressure of the dynamic pressure gas bearing is also non-uniformly distributed in the axial direction, so that the support foil 20 can better adapt to the actual load and has stronger bearing capacity.
Referring to fig. 6, two adjacent sliding beams 23 in the first direction X are staggered from each other along the second direction Y and at least partially arranged in a crossed manner, so that the density of the sliding arms 231 and the sliding ends 2311 in the middle area is higher, the coulomb friction between the inner wall of the corresponding area of the bearing sleeve 10 and the sliding ends 2311 is increased, and the stability of the dynamic pressure gas bearing is further improved.
Example two:
the essential technical features of the hydrodynamic gas bearing in this embodiment are substantially the same as those of the hydrodynamic gas bearing in the first embodiment, and the difference is that: in this embodiment, referring to fig. 8, the sliding arm 231 may also be arc-shaped, and the arc-shaped sliding end 2311 is more favorable for sliding on the inner wall of the bearing housing 10 to generate coulomb friction.
Also in this embodiment, the width of the sliding beam 23 in the first direction X may be designed to increase gradually from both sides to the middle in order to enable the support foil 20 to better adapt to the actual load.
Example three:
the essential technical features of the hydrodynamic gas bearing in this embodiment are substantially the same as those of the hydrodynamic gas bearing in the first embodiment, and the difference is that: in this embodiment, please refer to fig. 9, a plurality of first sliding beam sets M are distributed on the supporting foil 20, and each first sliding beam set M is distributed at intervals along the first direction X and the second direction Y, specifically, three rows of first sliding beam sets M are distributed along the first direction X, four rows of first sliding beam sets M are distributed along the second direction Y, and a total of twelve first sliding beam sets M are distributed. The first sliding beam group M includes three sliding beams 23 spaced apart from each other along the first direction X, and the connecting arms 232 of two adjacent sliding beams 23 in the same first sliding beam group M are connected and the connecting points are separated from the supporting foil 20, that is, the three sliding beams 23 in each group are communicated with each other in the middle, so that two sliding arms 231 symmetrically arranged along the second direction Y are formed between the two sliding beams 23, thereby not only increasing the number and density of the sliding arms 231 and improving the bearing capacity of the whole supporting foil 20, but also enabling the deformation forces between the adjacent sliding beams 23 to be mutually transmitted, so as to enable the deformations of the sliding beams 23 to be mutually balanced, improve the deformation bearing capacity of the first sliding beam group M in each group, and further improve the bearing capacity of the whole dynamic pressure gas bearing. It should be understood that, in other embodiments of the present application, the number and distribution of the first sliding beam groups M may also be changed as appropriate according to the actual design situation, and the number of the sliding beams 23 in each first sliding beam group M may also be increased or decreased, for example, may be two or more than four, which is not limited herein.
Referring to fig. 9, the width of each sliding beam 23 in the same first sliding beam group M is equal. And along first direction X, the width of first sliding beam group M is crescent from both sides to the centre for first sliding beam group M on the different axial has different sizes, thereby has different rigidity and damping nature, and then adaptation actual load that can be better.
Further, in this embodiment, the respective slide beams 23 positioned in the same row in the first direction X are aligned with each other at both ends in the second direction Y, so that the transmission of the deformation force of the respective slide beams 23 in each first slide beam group M is smooth.
Example four:
the essential technical features of the hydrodynamic gas bearing in this embodiment are substantially the same as those of the hydrodynamic gas bearing in the first embodiment, and the difference is that: in the present embodiment, referring to fig. 10 to 12, a plurality of second sliding beam sets N are distributed on the supporting foil 20, and each of the second sliding beam sets N is distributed at intervals along the first direction X and the second direction Y, respectively. The second sliding beam group N includes at least two sliding beams 23, wherein the at least two sliding beams 23 are respectively a first sliding beam 23a and at least one second sliding beam 23 b; the first sliding beam 23a includes two first sliding arms 231a, the second sliding beam 23b includes two second sliding arms 231b, each second sliding arm 231b is correspondingly nested in the two first sliding arms 231a, that is, the first sliding arm 231a is a hollow arm and is disposed on the outer side, and each second sliding arm 231b is a solid arm and is disposed inside the first sliding arm 231 a. As can be seen, the length of the first sliding arm 231a in the second direction Y is greater than the length of the second sliding arm 231b in the second direction Y. Referring to fig. 11, after the support foil 20 is bent, the first sliding end 2311a of the first sliding arm 231a contacts the inner wall of the bearing housing 10, and the second sliding end 2311b of the second sliding arm 231b is in a suspended state, i.e., the first sliding arm 231a plays a supporting role, and the second sliding arm 231b does not play a supporting role. Referring to fig. 12, when the hydrodynamic gas bearing bears a certain load, the top foil 30 acts on the support foil 20, the support foil 20 deforms to a certain extent, the distance between the support foil 20 and the inner wall of the bearing housing 10 decreases, the first sliding arm 231a deforms accordingly, when the first sliding arm 231a deforms to a certain extent, the second sliding end 2311b of the second sliding arm 231b contacts with the inner wall of the bearing housing 10 and starts to have a supporting function, and at this time, the first sliding arm 231a and the second sliding arm 231b both play a bearing role. In summary, the first sliding beam 23a and the second sliding beam 23b are nested inside and outside, so that the rigidity of the supporting foil 20 is increased along with the increase of the load, and the bearing capacity of the whole dynamic pressure gas bearing is further improved.
Specifically, in the present embodiment, referring to fig. 10, two second sliding arms 231b of the second sliding beam 23b are respectively formed on two first sliding arms 231a of the first sliding beam 23a, that is, as shown in fig. 10, the second sliding arm 231b of each second sliding beam 23b located above is formed on the first sliding arm 231a of the first sliding beam 23a located above, and the second sliding arm 231b of each second sliding beam 23b located below is formed on the first sliding arm 231a of the first sliding beam 23a located below, and the second sliding arms 231b located above are the same in size and aligned with each other, and the second sliding arms 231b located below are the same in size and aligned with each other. When two or more second sliding beams 23b are formed in the first sliding beam 23a, the second sliding beams 23b are spaced apart along the first direction X.
In a specific embodiment, referring to fig. 10, in the first direction X, two adjacent first sliding beams 23a are staggered and at least partially crossed with each other along the second direction Y, so that the density of the first sliding end 2311a and the second sliding end 2311b in the middle area is greater, the coulomb friction between the inner wall of the corresponding area of the bearing housing 10 and the first sliding end 2311 and the second sliding end 2311b is increased, and the stability of the dynamic pressure gas bearing is further improved.
Example five:
the essential technical features of the hydrodynamic gas bearing in this embodiment are substantially the same as those of the hydrodynamic gas bearing in the fourth embodiment, and the difference is that: in this embodiment, referring to fig. 13, at least one second sliding beam 23b is distributed on each first sliding arm 231a of the first sliding beam 23a, and when the number of the second sliding beams 23b is two or more, the second sliding beams 23b are distributed at intervals along the first direction X. The present application enables the supporting foil 20 to change various stiffness and damping properties when bearing different load levels by distributing at least one second sliding beam 23b on each first sliding arm 231a, so that the entire hydrodynamic gas bearing has better load-bearing adaptability.
Example six:
the essential technical features of the hydrodynamic gas bearing in this embodiment are substantially the same as those of the hydrodynamic gas bearing in the fourth embodiment, and the difference is that: in the present embodiment, referring to fig. 14, the width of the first sliding beam 23a and the width of the second sliding beam 23b in the same second sliding beam group N have a first ratio, and the first ratio gradually increases from two sides to the middle along the first direction X, that is, when the widths of the first sliding beams 23a are equal, the width of the second sliding beams 23b gradually decreases from two sides to the middle along the first direction X. By varying the first ratio of the first sliding beam 23a to the second sliding beam 23b as a function of the axial position of the support foil 20, the present application enables different critical loads for the stiffness transformation of the support foil 20 at different axial locations, which makes it possible to better use different loads without requiring an axial position.
Example seven:
the essential technical features of the hydrodynamic gas bearing in this embodiment are substantially the same as those of the hydrodynamic gas bearing in the first embodiment, and the difference is that: referring to fig. 15 and 16, the number of layers of the support foil 20 is at least one in the radial direction of the dynamic pressure gas bearing. When the number of layers of the support foils 20 is two or more, the support foils 20 are sequentially stacked from inside to outside, the sliding beams 23 of the support foils 20 located on the inner side sequentially penetrate the support foils 20 located on the outer side and can be supported on and slide on the inner wall of the bearing housing 10, and the length of the sliding beams 23 stacked on each other in the support foils 20 is sequentially reduced from inside to outside in the radial direction. As described above, referring to fig. 15, when the hydrodynamic gas bearing receives a certain load, the top foil 30 acts on each of the support foil pieces 20, each of the support foil pieces 20 is deformed to a certain extent, the distance between the support foil piece 20 and the inner wall of the bearing housing 10 is reduced, the sliding beam 23 on the support foil piece 20 closest to the top foil 30 starts to contact with the inner wall of the bearing housing 10 and is deformed, when the sliding beam 23 is deformed to a certain extent, the sliding beam 23 on the outer side thereof starts to contact with the inner wall of the bearing housing 10 and is deformed, and so on until the outermost sliding beam 23 contacts with the inner wall of the bearing housing 10 and is deformed. As described above, when the number of layers of the support foils 20 is larger, the number of layers of the sliding beam 23 is larger, and the rigidity of the entire support foil 20 is increased with an increase in load, thereby improving the load bearing capacity of the entire hydrodynamic gas bearing.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A dynamic pressure gas bearing is characterized by comprising a bearing sleeve, a top foil which is arranged in the bearing sleeve and is used for forming a gas film gap with a rotor, and at least two supporting foils which are supported between the bearing sleeve and the top foil and are distributed at intervals along the circumferential direction; two ends of the top foil are respectively arranged on the bearing sleeves; the supporting foil is of a straight sheet structure, one end of the supporting foil in the circumferential direction after being bent is mounted on the bearing sleeve, and the other end of the supporting foil is suspended in the air; the supporting foil is provided with a plurality of sliding beams in a hollow-out mode, each sliding beam is provided with two sliding ends, and each sliding end can be supported on the inner wall of the bearing sleeve and can slide on the inner wall of the bearing sleeve after the supporting foil is bent.
2. The hydrodynamic gas bearing according to claim 1, wherein each of said sliding beams is distributed in a first direction and a second direction, respectively, said first direction being set to an axial direction after said supporting foil is mounted, and said second direction being set to a circumferential direction after said supporting foil is mounted;
the sliding beam comprises a connecting arm and two sliding arms, the two sliding arms are symmetrically arranged on two sides of the connecting arm along the second direction, one end of each sliding arm is connected with the connecting arm, and the other end of each sliding arm is the sliding end.
3. The hydrodynamic gas bearing according to claim 2, wherein the width of the sliding arm in the first direction gradually increases from the sliding end to the connecting arm;
wherein, the sliding arm is trapezoidal or arc.
4. The gas dynamic pressure bearing according to claim 2, wherein a plurality of sets of first sliding beams are distributed on the support foil, and each set of first sliding beams is spaced apart along the first direction and the second direction, respectively; the first sliding beam group comprises at least two sliding beams which are distributed at intervals along the first direction, connecting arms of two adjacent sliding beams in the same first sliding beam group are connected, and the connecting positions are separated from the supporting foil sheet to form two symmetrically-arranged sliding arms.
5. The gas dynamic pressure bearing according to claim 1, wherein a plurality of second sliding beam sets are distributed on the supporting foil, and each of the second sliding beam sets is spaced apart in a first direction and a second direction, respectively; the second sliding beam group comprises at least two sliding beams, wherein the at least two sliding beams are respectively a first sliding beam and at least one second sliding beam; the first sliding beam comprises two first sliding arms, the second sliding beam comprises two second sliding arms, and each second sliding arm is correspondingly nested in the two first sliding arms.
6. The hydrodynamic gas bearing according to claim 5, wherein two second sliding arms of the second sliding beam are formed on two first sliding arms of the first sliding beam, respectively; when two or more second sliding beams are formed in the first sliding beam, the second sliding beams are distributed at intervals along the first direction.
7. The dynamic pressure gas bearing according to claim 5, wherein at least one second sliding beam is provided on each first sliding arm of the first sliding beams, and when the number of the second sliding beams is two or more, the second sliding beams are spaced apart in the first direction.
8. The dynamic pressure gas bearing according to any one of claims 5 to 7, wherein the width of the first sliding beam and the width of the second sliding beam in the same second sliding beam group have a first ratio which gradually increases from both sides to the middle in the first direction.
9. The dynamic pressure gas bearing according to any one of claims 5 to 7, wherein two adjacent first sliding beams in the first direction are offset from each other in the second direction and are disposed at least partially crosswise.
10. The hydrodynamic gas bearing according to any of claims 1 to 4, wherein the number of layers of the support foil is at least one in a radial direction of the hydrodynamic gas bearing; when the number of the layers of the supporting foils is two or more, the supporting foils are sequentially stacked from inside to outside, the sliding beams on the supporting foils on the inner side sequentially penetrate through the supporting foils on the outer side and can be supported on the inner wall of the bearing sleeve and slide on the inner wall of the bearing sleeve, and the lengths of the sliding beams stacked in the supporting foils are sequentially reduced from inside to outside along the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328967.4A CN112343917A (en) | 2020-11-24 | 2020-11-24 | Dynamic pressure gas bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328967.4A CN112343917A (en) | 2020-11-24 | 2020-11-24 | Dynamic pressure gas bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112343917A true CN112343917A (en) | 2021-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011328967.4A Pending CN112343917A (en) | 2020-11-24 | 2020-11-24 | Dynamic pressure gas bearing |
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| CN (1) | CN112343917A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855747A (en) * | 2021-04-12 | 2021-05-28 | 宙斯能源动力科技(大连)有限公司 | Positive and negative rotation direction dovetail-shaped structure air dynamic pressure radial foil bearing |
| CN114198391A (en) * | 2021-12-16 | 2022-03-18 | 中车株洲电机有限公司 | Air-float radial bearing |
| CN114857164A (en) * | 2022-04-28 | 2022-08-05 | 浙江飞旋科技有限公司 | Foil dynamic pressure bearing and shafting |
| CN115507121A (en) * | 2022-10-14 | 2022-12-23 | 势加透博(成都)科技有限公司 | Elastic foil, air bearing and air compressor |
| CN117432707A (en) * | 2023-12-20 | 2024-01-23 | 山东华东风机有限公司 | Radial air foil bearing and shafting |
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2020
- 2020-11-24 CN CN202011328967.4A patent/CN112343917A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855747A (en) * | 2021-04-12 | 2021-05-28 | 宙斯能源动力科技(大连)有限公司 | Positive and negative rotation direction dovetail-shaped structure air dynamic pressure radial foil bearing |
| CN112855747B (en) * | 2021-04-12 | 2022-07-19 | 宙斯能源动力科技(大连)有限公司 | Positive and negative rotation direction dovetail-shaped structure aerodynamic radial foil bearing |
| CN114198391A (en) * | 2021-12-16 | 2022-03-18 | 中车株洲电机有限公司 | Air-float radial bearing |
| CN114198391B (en) * | 2021-12-16 | 2023-05-12 | 中车株洲电机有限公司 | Air-float radial bearing |
| CN114857164A (en) * | 2022-04-28 | 2022-08-05 | 浙江飞旋科技有限公司 | Foil dynamic pressure bearing and shafting |
| CN114857164B (en) * | 2022-04-28 | 2023-08-11 | 浙江飞旋科技有限公司 | Foil hydrodynamic bearing and shafting |
| CN115507121A (en) * | 2022-10-14 | 2022-12-23 | 势加透博(成都)科技有限公司 | Elastic foil, air bearing and air compressor |
| CN115507121B (en) * | 2022-10-14 | 2024-02-13 | 势加透博(成都)科技有限公司 | Elastic foil, air bearing and air compressor |
| CN117432707A (en) * | 2023-12-20 | 2024-01-23 | 山东华东风机有限公司 | Radial air foil bearing and shafting |
| CN117432707B (en) * | 2023-12-20 | 2024-03-15 | 山东华东风机有限公司 | Radial air foil bearing and shafting |
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