CN220890821U - Radial foil gas dynamic pressure bearing and motor - Google Patents
Radial foil gas dynamic pressure bearing and motor Download PDFInfo
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- CN220890821U CN220890821U CN202322584691.1U CN202322584691U CN220890821U CN 220890821 U CN220890821 U CN 220890821U CN 202322584691 U CN202322584691 U CN 202322584691U CN 220890821 U CN220890821 U CN 220890821U
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- 239000011888 foil Substances 0.000 title claims abstract description 255
- 238000005452 bending Methods 0.000 claims description 61
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 21
- 230000008569 process Effects 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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Abstract
The utility model provides a radial foil gas dynamic pressure bearing and a motor, wherein the radial foil gas dynamic pressure bearing comprises: the wave foil comprises a first fixed end positioned at one end in the circumferential direction and a first free end positioned at the other end in the circumferential direction, and the top foil comprises a second fixed end positioned at the other end in the circumferential direction and a second free end positioned at the other end in the circumferential direction, wherein the first fixed end of the wave foil and the second fixed end of the top foil can be inserted into the second groove and fixed, and the first free end of the wave foil and the second free end of the top foil can be inserted into the first groove and limited. According to the utility model, the contact area between the free ends of the wave foil and the top foil and the bearing seat is effectively increased, the supporting area of the shaft is increased, the dead zone area is reduced, the bearing obtains a larger bearing area, and the environmental compatibility of the bearing is improved.
Description
Technical Field
The utility model relates to the technical field of gas bearings, in particular to a radial foil gas dynamic pressure bearing and a motor.
Background
At present, as shown in the prior art fig. 1, the conventional whole-circumference foil bearing is divided into three parts, namely a top foil, an arch foil and a bearing seat, the top foil and the arch foil are respectively cut and then are fixed with the bearing seat after being subjected to a series of working procedures such as stamping forming, heat treatment shaping and the like, as the foils are mostly made of thin metal sheets, the consistency is poor due to operation problems in the process of assembly and fixation, the fixation of the foils is mostly carried out in a pin extrusion mode and an inner ring welding mode, the former implementation is mainly influenced by the actual sizes of parts such as pins, bearing seat fixing holes and foil thickness, the situation that the pins are easily blocked due to overtightening or the fact that the pins are loosened in the process of using the clearance fit occurs is easily caused, the latter implementation needs special welding equipment to stretch into the inner ring of the bearing for welding, and because the foils are in a free state when the inner ring of the bearing seat is welded, the welding effect is not ideal regardless of single-piece welding or double-piece welding, and the conventional whole-circumference foil bearing cannot carry the whole circumference due to the fact that the free ends and the fixed ends are arranged, so that the existing bearing is not carried by the whole circumference, and the whole-circumference foil bearing is limited in application of the bearing.
Because the whole-circumference foil bearing in the prior art has the technical problems that a large bearing dead zone exists due to the arrangement of the free end and the fixed end, the whole-circumference bearing cannot be realized, the application of the whole-circumference foil bearing is limited, and the like, the utility model designs a radial foil gas dynamic pressure bearing and a motor.
Disclosure of utility model
Therefore, the technical problem to be solved by the utility model is to overcome the defects that the whole-circumference foil bearing in the prior art has a large bearing dead zone, cannot bear the whole circumference, and the application of the whole-circumference foil bearing is limited, so that the radial foil gas dynamic pressure bearing and the motor are provided.
In order to solve the above-mentioned problems, the present utility model provides a radial foil gas dynamic pressure bearing comprising:
The wave foil comprises a first fixed end positioned at one end in the circumferential direction and a first free end positioned at the other end in the circumferential direction, and the top foil comprises a second fixed end positioned at one end in the circumferential direction and a second free end positioned at the other end in the circumferential direction, wherein the first fixed end of the wave foil and the second fixed end of the top foil can be inserted into the second groove and fixed, and the first free end of the wave foil and the second free end of the top foil can be inserted into the first groove and limited.
In some embodiments of the present invention, in some embodiments,
The depth of the first groove is smaller than that of the second groove, and/or the first groove and the second groove are connected in the circumferential direction of the bearing seat to form a stepped open groove.
In some embodiments of the present invention, in some embodiments,
The first groove has a depth h1 in the radial direction, and the second groove has a depth h2, h 1＝(1/3～2/3)h2 in the radial direction.
In some embodiments of the present invention, in some embodiments,
The length of the first free end of the bump foil inserted into the first slot is Z, the length of the second free end of the top foil inserted into the first slot is also Z, the length of the first fixed end of the bump foil inserted into the second slot is G, the length of the second fixed end of the top foil inserted into the second slot is also G, and the following relation is satisfied: z= (0.8 to 0.9) h 1,G＝(0.8～0.9)h2.
In some embodiments of the present invention, in some embodiments,
The width of the first groove in the circumferential direction is W1, the width of the second groove in the circumferential direction is W2, when there is only one layer of bump foil and one layer of top foil, the thickness of the bump foil is defined as t 11, the thickness of the top foil is defined as t 21, if there are multiple layers of top foil and bump foil, the thickness of each layer of bump foil is defined as t 1n (n=1, 2,3,4, …), the thickness of each layer of top foil is defined as t 2n (n=1, 2,3,4, …), the thickness of the bottom plate is defined as t 3, wherein the bottom plate is located between the bump foil and the bearing seat, and the following relation is satisfied: w 2＝N2*(t11+t21+…+t1n+t2n+t3), the value interval of N 2 is 1.5-2.5, W 1＝N1*(t11+t21+…+t1n+t2n+t3), and the value interval of N 1 is 3-8.
In some embodiments of the present invention, in some embodiments,
The bump foil includes: support arch, hollow groove, first free end first stiff end and buckle line, the bump foil includes four sizes, is respectively: the corrugated foil is cut by engraving to form the hollowed-out groove, the hollowed-out groove is positioned at the edge of the supporting arch, and the hollowed-out groove is cut by engraving to form the supporting arch.
In some embodiments of the present invention, in some embodiments,
The projection surface structure of the supporting arch on the wave foil unfolding plane is rectangular, the hollowed-out grooves are cut at two long edges and one wide edge of the supporting arch, and only one wide edge is left without cutting the hollowed-out grooves; the circumferential length of the hollowed-out groove is the same as the length of the circumferential arc length L of the supporting arch.
In some embodiments of the present invention, in some embodiments,
The corrugated foil sheet is characterized in that a line which is arranged at a preset distance from one end of the corrugated foil sheet in the circumferential direction and extends along the axial direction is a first bending line, a line which is arranged at the other end of the corrugated foil sheet in the circumferential direction and extends along the axial direction and is arranged at the other end of the corrugated foil sheet in the circumferential direction and extends along the axial direction is a second bending line, and both the first bending line and the second bending line are bent towards one side to form folds, so that the corrugated foil sheet can automatically present a bending trend, and then the first bending line is bent towards the opposite direction of the bending trend to form the first free end, and the second bending line is bent towards the opposite direction of the bending trend to form the first fixed end.
In some embodiments of the present invention, in some embodiments,
Of the plurality of support arches, one row is in the circumferential direction and one column is in the axial direction; in the same row, the support arch length L, the support arch circumferential spacing L1, the support arch width L and the support arch axial spacing L 1 of a plurality of support arches are the same; and/or, in the same column, the support arch circumferential arc length L, the adjacent support arch circumferential spacing L1, the support arch axial width L, and the adjacent support arch axial spacing L 1 of a plurality of the support arches are the same.
In some embodiments of the present invention, in some embodiments,
Of the plurality of support arches, one row is in the circumferential direction and one column is in the axial direction; along the axial direction, the support arches of two adjacent rows are oppositely arranged or are not oppositely arranged, and the non-oppositely arranged is staggered; and/or, along the axial direction, the support arch lengths L of the support arches of two adjacent rows are unequal, and in the two rows of support arches of one row at intervals, the support arch circumferential arc lengths L of the two rows of support arches are equal.
The utility model also provides an electric machine comprising the radial foil gas dynamic pressure bearing.
The radial foil pneumatic dynamic bearing and the motor provided by the utility model have the following beneficial effects:
1. According to the utility model, through the first groove and the second groove structures formed in the inner peripheral wall of the bearing seat, the first fixed end of the wave foil and the second fixed end of the top foil can be effectively inserted into the second groove for fixing, and meanwhile, the first free end of the wave foil and the second free end of the top foil can be inserted into the first groove for effective limiting;
2. The utility model also limits the sizes of the two grooves, in particular limits the depth and the width of the long and short grooves, namely h 1＝(1/3～2/3)h2,Z＝(0.8～0.9)h1,G＝(0.8～0.9)h2, and adjusts the positions of the corrugated foils through the widths of the long and short grooves (W 1/W2 and h 1/h2), so that gaps exist between the free ends and the fixed ends of the corrugated foils and the groove walls, the degree of irregular change of the sizes of the corrugated foils in the bending process is adjusted, the self-adaptability of the bearing is ensured, the normal movable space of the bearing in operation is ensured, and the condition that the sizes of the bearing are unqualified due to the unqualified shapes after heat treatment possibly occurring in the manufacturing process of the corrugated foils is avoided;
3. The utility model also adopts the engraving process to cut out the hollowed groove so as to form the supporting arch, and the supporting arch is processed in a mode of forming the supporting arch, and is matched with the bending process to form the self-bending wave foil structure.
Drawings
FIG. 1 is a cross-sectional view of a prior art foil gas bearing;
FIG. 2 is an enlarged view of a portion of FIG. 1 with respect to the fixed and free ends;
FIG. 3 is a cross-sectional view of a bearing housing of a radial foil gas dynamic pressure bearing with stepped open grooves of the present utility model;
FIG. 4 is a developed block diagram of a self-bending wave foil of the radial foil gas dynamic bearing of the present utility model;
FIG. 5 is a process diagram of the self-bending forming of the self-bending wave foil of the radial foil gas dynamic pressure bearing of the present utility model;
FIG. 6 is an assembly view of a bump foil, top foil and bearing housing of the radial foil gas dynamic pressure bearing of the present utility model;
FIG. 7 is a block diagram of a top foil of the radial foil gas dynamic pressure bearing of the present utility model;
FIG. 8 is a topological structure diagram of a first embodiment of a bump foil of a radial foil gas dynamic bearing of the utility model;
FIG. 9 is a topological structure diagram of a second embodiment of a bump foil of a radial foil gas dynamic bearing of the present utility model;
Fig. 10 is a topological structure diagram of a bump foil of a third embodiment of the radial foil gas dynamic pressure bearing of the utility model.
The reference numerals are:
1. A bearing seat; 11. a first groove; 12. a second groove; 2. a bump foil; 21. a hollow groove; 22. a support arch; 23. a first bending line; 23', a second bend line; 24. a first free end; 25. a first fixed end; 3. a top foil; 31. a second free end; 32. and a second fixed end.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.
As shown in fig. 3 to 10, the present utility model provides a radial foil gas dynamic bearing comprising:
The bearing seat 1, the bump foil 2 and the top foil 3, the first groove 11 and the second groove 12 are formed in the inner peripheral wall of the bearing seat 1, the bump foil 2 comprises a first fixed end 25 positioned at one circumferential end and a first free end 24 positioned at the other circumferential end, the top foil 3 comprises a second fixed end 32 positioned at one circumferential end and a second free end 31 positioned at the other circumferential end, the first fixed end 25 of the bump foil 2 and the second fixed end 32 of the top foil 3 can be inserted into the second groove 12 and fixed, and the first free end 24 of the bump foil 2 and the second free end 31 of the top foil 3 can be inserted into the first groove 11 and limited.
According to the utility model, through the first groove and the second groove structures formed in the inner peripheral wall of the bearing seat, the first fixed end of the wave foil and the second fixed end of the top foil can be effectively inserted into the second groove for fixing, and meanwhile, the first free end of the wave foil and the second free end of the top foil can be inserted into the first groove for effective limiting.
The fixed end and the free end of the utility model are inserted into the corresponding grooves to be fixed after being bent, the free end is supported by bending, and the dead area is the minimum distance between the free end and the fixed end of the foil (the first groove and the second groove in figure 3). The prior art adopts pin extrusion and inner ring welding modes, namely the fixed end is limited and can not move, and the assembly mode is fixed. The foil is unsupported at the free end, the dead area is the distance from the last arch of the free end of the foil to the fixed end (namely, the distance from the last arch of the free end to the fixed end in fig. 2 is larger, so that the dead area is greatly reduced compared with the original scheme, the bearing area is increased, and the bearing performance is greatly improved.
The utility model provides an assembly mode of a stepped open slot, and is matched with a wave foil structure with self-bending forming, so that the manufacturing and assembly of the foil type air bearing are more convenient, the bearing can obtain a larger bearing area, and the environmental compatibility of the bearing is improved.
The improvement points of the utility model are as follows:
1. A method for assembling and fixing a stepped open slot and a foil matched with the stepped open slot;
2. a bump foil structure with self-bending molding.
The utility model solves the following technical problems:
1. The assembly mode with higher suitability is provided, the convenience of manufacturing and assembly is ensured, meanwhile, the area of a bearing dead zone is reduced, so that a bearing can obtain a larger bearing area, and the environmental compatibility of the bearing is improved;
2. The problem that the size of the bearing is unqualified due to the fact that the shape of the bearing does not reach the standard after heat treatment possibly occurring in the manufacturing process of the bump foil is avoided;
3. and designing the rigidity and damping in different areas around the bearing according to the design of the bearing and the rigidity distribution requirement in actual use.
In some embodiments of the present invention, in some embodiments,
The depth of the first groove 11 is smaller than that of the second groove 12, and/or the first groove 11 and the second groove 12 are connected in the circumferential direction of the bearing seat 1 to form a stepped open groove.
The first groove and the second groove are preferably formed, the depth of the first groove is smaller than that of the second groove, so that the first groove is formed into a short groove, the free ends of the wave foil and the top foil are only required to be inserted into the short groove to form limit, but the depth of the second groove is deeper, and the fixed ends of the wave foil and the top foil are inserted into the second groove and are fixed in a fastening mode such as a screw, so that the fixing effect is achieved; the first groove and the second groove are connected to form the stepped open groove, so that the dead area of the utility model is only a small distance from the right of the first groove to the second groove, the dead area can be further reduced, and the bearing area is improved.
The utility model provides a self-bending radial foil pneumatic dynamic pressure bearing, which comprises three main structures (shown in figure 6) of a bearing seat 1, a wave foil 2 and a top foil 3, wherein the profile of the bearing seat 1 is a hollow annular structure, the inner wall of the hollow ring is provided with a stepped open groove along the radial direction, the stepped open groove is formed by a long groove (namely a second groove 12) and a short groove (namely a first groove 11) along the radial direction, the length of the short groove is defined as h1, the width of the short groove is defined as W1, the length of the long groove is defined as h2, the width of the long groove is defined as W2 (shown in figure 3), and the short groove of the stepped open groove is used as an assembly position of a first free end 24 of the wave foil 2 and a second free end 31 of the top foil 3 of the foil bearing, and is used for positioning the circumferential positions of the first free end 24 of the wave foil 2 and the second free end 31 of the top foil 3 of the foil bearing. The long groove of the stepped open groove is used as the assembly position of the first fixed end 25 of the wave foil 2 and the second fixed end 32 of the top foil 3 of the foil bearing, and is used for positioning the circumferential positions of the first fixed end 25 of the wave foil 2 and the second fixed end 32 of the top foil 3 of the foil bearing, so that the tangential impact force generated on the first fixed end 25 of the wave foil 2 and the second fixed end 32 of the top foil 3 of the foil bearing when the bearing rotor operates is born, and meanwhile, the wave foil 2 and the top foil 3 are ensured not to generate larger circumferential sliding.
In some embodiments of the present invention, in some embodiments,
The first grooves 11 have a depth h1 in the radial direction, and the second grooves 12 have a depth h2 in the radial direction, h1= (1/3 to 2/3) h2. The utility model also limits the sizes of the two grooves, in particular to the depth of the long groove, namely h1= (1/3-2/3) h2, and the position of the corrugated foil can be adjusted through the depth of the long groove (h 1/h 2), so that gaps exist between the free end and the fixed end of the corrugated foil and the groove wall, the degree of irregular change of the size of the corrugated foil in the bending process is adjusted, the self-adaptability of the bearing is ensured, the normal movable space of the corrugated foil in the working process is ensured, and the condition that the size of the bearing is unqualified due to the fact that the shape of the corrugated foil does not reach standards after heat treatment possibly occurs in the manufacturing process of the corrugated foil is avoided.
In some embodiments of the present invention, in some embodiments,
The length of the first free end 24 of the bump foil 2 inserted into the first slot 11 is Z, the length of the second free end 31 of the top foil 3 inserted into the first slot 11 is also Z, the length of the first fixed end 25 of the bump foil 2 inserted into the second slot 12 is G, and the length of the second fixed end 32 of the top foil 3 inserted into the second slot 12 is also G, and the following relationship is satisfied: z= (0.8 to 0.9) h 1,G＝(0.8～0.9)h2.
The utility model further limits the sizes of the two grooves, and further limits the depth of the long groove, namely Z= (0.8-0.9) h 1,G＝(0.8～0.9)h2 is satisfied, the position of the corrugated foil can be regulated through the limit of the depth of the long groove, so that gaps exist between the free end and the fixed end of the corrugated foil and the groove wall, the degree of irregular change of the size of the corrugated foil in the bending process is regulated, the self-adaptability of the bearing is ensured, the normal movable space of the corrugated foil in the working process is ensured, and the condition that the size of the bearing is unqualified due to the fact that the shape of the corrugated foil does not reach the standard after heat treatment possibly occurs in the manufacturing process of the corrugated foil is avoided.
The length of the short groove (the first groove 11) of the step opening groove is defined as h 1, the length of the long groove is defined as h 2, and because the long groove and the short groove of the step opening groove are respectively used as circumferential positioning grooves of the free end and the fixed end of the bump foil 2 and the top foil 3, the relative positions of the long groove and the short groove determine the actual running direction of the radial foil pneumatic dynamic bearing of the bearing seat using the step opening groove, and the embodiment is illustrated by taking the embodiment as an example shown in fig. 3, the short groove is positioned at the left side of the long groove, the free end of the radial foil pneumatic dynamic bearing in the bearing seat is illustrated at the left side of the fixed end, the reference radial foil pneumatic dynamic bearing is generally rotated from the free end to the fixed end, the rotating direction of the radial foil pneumatic dynamic bearing using the bearing seat is also rotated from the free end to the fixed end, namely counterclockwise, otherwise, and if the short groove is positioned at the right side of the long groove, the rotating direction of the radial foil pneumatic dynamic bearing using the bearing seat is clockwise. In order to ensure the reliability of the foil running in the bearing seat, besides restraining the relative positions of the long groove and the short groove, the relative lengths of the long groove and the short groove and the effective lengths of the free end and the fixed end of the top foil 3 and the bump foil 2 respectively embedded in the short groove and the long groove are also required to be restrained, the effective length of the free end is defined as Z, the effective length of the fixed end is defined as G, the optimal use effect is achieved by providing that the dimensional relationship of h 1＝(1/3～2/3)h2 needs to be met between the length h 1 of the short groove and the length h 2 of the long groove, the dimensional relationship of Z= (0.8-0.9) h 1 needs to be met by the effective lengths of the bump foil 2 and the free end embedded in the short groove, the dimensional relationship of G= (0.8-0.9) h 2 needs to be met by the effective lengths of the fixed end embedded in the long groove, and the above relationships need to be met simultaneously. The dimension ensures that the bump foil and the top foil are placed in the groove and cannot be propped up to the head, a small distance is reserved to ensure that the fixed end and the free end of the bearing can freely move for a small distance when the bearing works, the gap cannot be too small so as to accommodate the free end to move in the gap, and the gap cannot be too large, so that the foils are prevented from being staggered.
In some embodiments of the present invention, in some embodiments,
The width of the first groove 11 in the circumferential direction is W1, the width of the second groove 12 in the circumferential direction is W2, when there is only one layer of bump foil and one layer of top foil, the thickness of the bump foil 2 is defined as t 11, the thickness of the top foil 3 is defined as t 21, if there are multiple layers of top foil and bump foil, the thickness of each layer of bump foil is defined as t 1n (n=1, 2,3,4, …), the thickness of each layer of top foil is defined as t 2n (n=1, 2,3,4, …), the thickness of the bottom plate is defined as t 3, wherein the bottom plate is located between the bump foil 2 and the bearing housing 1, and the following relationship is satisfied: w 2＝N2*(t11+t21+…+t1n+t2n+t3), the value interval of N 2 is 1.5-2.5, W 1＝N1*(t11+t21+…+t1n+t2n+t3), and the value interval of N 1 is 3-8.
The utility model further limits the sizes of the two grooves, namely, the width of the long groove and the short groove is limited, namely, W 2＝N2*(t11+t21+…+t1n+t2n+t3 is met), the value interval of N 2 is 1.5-2.5, W 1＝N1*(t11+t21+…+t1n+t2n+t3), the value interval of N 1 is 3-8, the positions of the corrugated foil can be regulated through the limitation of the width of the long groove, gaps exist between the free end and the fixed end of the corrugated foil and the groove wall, the degree of irregular change of the size of the corrugated foil in the bending process is regulated, the self-adaptability of the bearing is ensured, the normal movable space of the bearing in the working process is ensured, and the condition that the size of the bearing is unqualified due to the unqualified shape after heat treatment possibly occurring in the manufacturing process of the corrugated foil is avoided.
In the utility model, when the radial foil bearing has only one layer of bump foil and one layer of top foil except the bearing seat, the thickness of the bump foil 2 is defined as t 11, the thickness of the top foil 3 is defined as t 21, if multiple layers of the top foil and the bump foil exist, the thickness of each layer of bump foil is sequentially defined as t 1n (n=1, 2,3,4, …), the thickness of each layer of top foil is sequentially defined as t 2n (n=1, 2,3,4, …), the thickness of the bottom plate is defined as t 3, the width W 2 of the long groove (the second groove 12) in the stepped open groove is required to meet W 2＝N2*(t11+t21+…+t1n+t2n+t3 for meeting the practical use requirement and the reliability requirement, the value interval of the multiple N 2 is 1.5-2.5 times (the long groove is made to contain a plurality of bump foils, top foils and bottom plates) according to the specific process level, the same width W 1 of the short groove (the first groove 11) is met for meeting the practical use requirement and the width W 1 of the short groove), and the multiple N 2 is 1.5-2.5 times the value of the multiple N 2 is required to be a plurality of times the multiple of the wave foils in the circumferential deformation value of the multiple of the top foil according to the specific process level.
In some embodiments of the present invention, in some embodiments,
The bump foil 2 includes: the support arch 22, the hollow groove 21, the first free end 24, the first fixed end 25 and the bending line, and the bump foil 2 comprises four dimensions respectively: the corrugated foil sheet 2 is cut by engraving to form the engraved groove 21, the engraved groove 21 is positioned at the edge of the supporting arch 22, and the engraved groove 21 is cut by engraving to form the supporting arch 22, wherein the circumferential arc length L of the supporting arch, the circumferential spacing L 1 between two adjacent supporting arches, the axial width L of the supporting arch and the axial spacing L 1 between two adjacent supporting arches are all the same.
The utility model also adopts the engraving process to cut out the hollowed groove so as to form the supporting arch, and the supporting arch is processed in a mode of forming the supporting arch, and is matched with the bending process to form the self-bending wave foil structure.
The bump foil 2 of the radial foil gas dynamic pressure bearing of the present utility model comprises: a hollow groove 21; a support arch 22; a first bending line 23; a second bending line 23'; a first free end 24; the first fixing end 25 has four critical dimensions (as shown in fig. 4), namely l=support arch length, L 1 =support arch circumferential spacing, l=support arch width, L 1 =support arch axial spacing, the corrugated foil 2 needs to be engraved and cut in advance, the engraved groove 21 is engraved, the length of the engraved groove 21 is the same as the support arch length L, the width of the engraved groove 21 depends on the specific design scheme, no constraint is made here, the corrugated foil of the automatic bending radial foil gas dynamic pressure bearing of the utility model needs to form a crease along one side at the first bending line 23 and the second bending line 23 'at two sides of all support arches 22 through special tools, meanwhile, the smooth and seamless surface of the support arch 22 is ensured, the corrugated foil 2 will automatically present a bending trend, and two sides of the whole corrugated foil 2 will be bent along the first bending line 23 and the second bending line 23' in the opposite direction of the bending trend to form the first free end 24; the first fixed end 25 is used for forming the bump foil 2 of the radial foil gas dynamic pressure bearing which is formed by self-bending, and only the first free end 24 of the manufactured bump foil 2 is needed; the first fixing end 25 is respectively embedded into the corresponding long slot position and the short slot position to complete the assembly of the bearing, and the self-bending wave foil 2 has strong topologic property (topologic property means that the structural characteristics are various, and the supporting characteristic of the wave foil is kept unchanged). By designing and changing the support arch length L, the support arch circumferential spacing L 1, the support arch width L, the support arch axial spacing L 1 and the relative positions of the support arches 22 of each row and each column, the requirements of the support force, the support rigidity and the damping of the system under different use conditions can be met (as shown in fig. 8-10, only part of topological structures are shown), and a designer can design rigidity and damping of different areas of the whole bearing according to the actual running state of the bearing so as to obtain the optimal bearing performance.
In some embodiments of the present invention, in some embodiments,
The projection plane structure of the supporting arch 22 on the spreading plane of the foil sheet 2 is rectangular, the hollow grooves 21 are cut at two long edges and one wide edge of the supporting arch 22, and only one wide edge is left without cutting the hollow grooves; the circumferential length of the hollow groove 21 is the same as the circumferential arc length L of the support arch.
The support arch is a further preferable structural form of the utility model, by cutting the hollowed-out groove on both long sides and one wide side of the support arch, only one wide side is left without cutting the hollowed-out groove, the hollowed-out groove can be formed by cutting on the upper, right and lower sides of the support arch, and only one end (the left end as shown in fig. 4) is a connecting end, so that the support arch is of a movable structure, the support area can be increased, and the bearing performance is further improved.
In some embodiments of the present invention, in some embodiments,
The line of the bump foil 2 extending along the axial direction at a predetermined distance from one end in the circumferential direction is a first bending line 23, the line of the bump foil 2 extending along the axial direction at a predetermined distance from the other end in the circumferential direction is a second bending line 23', and the first bending line 23 and the second bending line 23' are both bent to one side to form a crease, so that the bump foil 2 can automatically exhibit a bending tendency, the first bending line 23 is bent to the opposite direction of the bending tendency to form the first free end 24, and the second bending line 23' is bent to the opposite direction of the bending tendency to form the first fixed end 25.
According to the utility model, through the arrangement of the first bending line and the second bending line and the arrangement of the matched hollow groove, and the wave foil with an automatic bending trend is formed by combining the bending crease, the first free end and the first fixed end can be further formed by bending towards the opposite direction, so that the radial wave foil structure formed by self-bending can be formed, the problems of inconsistent deformation and stress concentration in the cold-rolled foil processing process are solved, and the mould is required to be replaced for different structures, so that the manufacturing is more convenient.
In some embodiments of the present invention, in some embodiments,
Of the plurality of support arches 22, one row is in the circumferential direction and one column is in the axial direction; and in the same row, the support arch lengths L, the support arch circumferential pitches L1, the support arch widths L, and the support arch axial pitches L 1 of the plurality of support arches 22 are all the same; and/or, and in the same column, the support arch circumferential arc length L, the adjacent support arch circumferential spacing L1, the support arch axial width L, and the adjacent support arch axial spacing L 1 of the plurality of support arches 22 are all the same.
This is a topological form of the first embodiment of the present utility model and a topological form of the second embodiment of the present utility model, as shown in fig. 8 and 9, respectively, so that the present utility model can design the rigidity and damping in different areas around the bearing according to the design of the bearing and the rigidity distribution requirement in actual use, so as to form the structures of the different embodiments.
In some embodiments of the present invention, in some embodiments,
Of the plurality of support arches 22, one row is in the circumferential direction and one column is in the axial direction; along the axial direction, the support arches of two adjacent rows are oppositely arranged or are not oppositely arranged, and the non-oppositely arranged is staggered; and/or, along the axial direction, the support arch lengths L of the support arches of two adjacent rows are unequal, and in the two rows of support arches of one row at intervals, the support arch circumferential arc lengths L of the two rows of support arches are equal.
This is the topology of the first and second embodiments of the present utility model, and the third embodiment, as shown in fig. 8 and 9 and 10, respectively, so that the present utility model can design the rigidity and damping in different areas around the bearing according to the design of the bearing and the rigidity distribution requirement in actual use, so as to form the structures of different embodiments.
The utility model also provides an electric machine comprising the radial foil gas dynamic pressure bearing.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.
Claims (11)
1. A radial foil gas dynamic pressure bearing, characterized by: comprising the following steps:
The wave foil structure comprises a bearing seat (1), a wave foil (2) and a top foil (3), wherein a first groove (11) and a second groove (12) are formed in the inner peripheral wall of the bearing seat (1), the wave foil (2) comprises a first fixed end (25) located at one circumferential end and a first free end (24) located at the other circumferential end, the top foil (3) comprises a second fixed end (32) located at one circumferential end and a second free end (31) located at the other circumferential end, the first fixed end (25) of the wave foil (2) and the second fixed end (32) of the top foil (3) can be inserted into the second groove (12) and fixed, and the first free end (24) of the wave foil (2) and the second free end (31) of the top foil (3) can be inserted into the first groove (11) and limited.
2. The radial foil hydrodynamic bearing of claim 1, wherein:
The depth of the first groove (11) is smaller than that of the second groove (12), and/or the first groove (11) and the second groove (12) are connected in the circumferential direction of the bearing seat (1) to form a stepped open groove.
3. The radial foil hydrodynamic bearing of claim 2, wherein:
The first groove (11) has a depth h1 in the radial direction, and the second groove (12) has a depth h2, h 1＝(1/3～2/3)h2 in the radial direction.
4. A radial foil hydrodynamic bearing as claimed in claim 3 wherein:
The length of the first free end (24) of the bump foil (2) inserted into the first groove (11) is Z, the length of the second free end (31) of the top foil (3) inserted into the first groove (11) is also Z, the length of the first fixed end (25) of the bump foil (2) inserted into the second groove (12) is G, the length of the second fixed end (32) of the top foil (3) inserted into the second groove (12) is also G, and the following relation is satisfied: z= (0.8 to 0.9) h 1,G＝(0.8～0.9)h2.
5. The radial foil hydrodynamic bearing of claim 1, wherein:
The width of the first groove (11) along the circumferential direction is W1, the width of the second groove (12) along the circumferential direction is W2, when only one layer of wave foil and one layer of top foil are arranged, the thickness of the wave foil (2) is defined as t 11, the thickness of the top foil (3) is defined as t 21, if a plurality of layers of the wave foil and the wave foil exist, the thickness of each layer of the wave foil is sequentially defined as t 1n (n=1, 2,3,4, …), the thickness of each layer of the top foil is sequentially defined as t 2n (n=1, 2,3,4, …), the radial foil pneumatic bearing further comprises a bottom plate, wherein the bottom plate is arranged between the wave foil (2) and the bearing seat (1), the thickness of the bottom plate is defined as t 3, and the following relation is satisfied: w 2＝N2*(t11+t21+…+t1n+t2n+t3), the value interval of N 2 is 1.5-2.5, W 1＝N1*(t11+t21+…+t1n+t2n+t3), and the value interval of N 1 is 3-8.
6. The radial foil hydrodynamic bearing of claim 1, wherein:
The bump foil (2) comprises: support arch (22), fretwork groove (21), first free end (24) first stiff end (25) and buckle line, bump foil (2) are including four sizes, are respectively: the corrugated foil sheet (2) is cut by engraving to form the hollowed-out groove (21), the hollowed-out groove (21) is positioned at the edge of the supporting arch (22), and the hollowed-out groove (21) is cut by engraving to form the supporting arch (22).
7. The radial foil hydrodynamic bearing of claim 6, wherein:
The projection surface structure of the supporting arch (22) on the unfolding plane of the foil sheet (2) is rectangular, the hollowed-out grooves (21) are cut at two long sides and one wide side of the supporting arch (22), and only one wide side is left without cutting the hollowed-out grooves; the circumferential length of the hollowed-out groove (21) is the same as the circumferential arc length L of the supporting arch.
8. The radial foil hydrodynamic bearing of claim 6, wherein:
The wave foil piece (2) is a first bending line (23) at a preset distance from one end of the circumference direction and along the axial direction, the wave foil piece (2) is a second bending line (23 ') at a preset distance from the other end of the circumference direction and along the axial direction, the first bending line (23) and the second bending line (23 ') are both bent towards one side to form crease lines, so that the wave foil piece (2) can automatically present bending trend, the first bending line (23) is bent towards the opposite direction of the bending trend to form a first free end (24), and the second bending line (23 ') is bent towards the opposite direction of the bending trend to form a first fixed end (25).
9. The radial foil hydrodynamic bearing of claim 6, wherein:
Of the plurality of support arches (22), one row is in the circumferential direction and one column is in the axial direction; in the same row, the support arch length L, the support arch circumferential spacing L1, the support arch width L and the support arch axial spacing L 1 of a plurality of support arches (22) are the same; and/or, in the same column, the support arch circumferential arc length L, the adjacent support arch circumferential spacing L1, the support arch axial width L, and the adjacent support arch axial spacing L 1 of a plurality of the support arches (22) are the same.
10. The radial foil hydrodynamic bearing of claim 6, wherein:
Of the plurality of support arches (22), one row is in the circumferential direction and one column is in the axial direction; along the axial direction, the support arches of two adjacent rows are oppositely arranged or are not oppositely arranged, and the non-oppositely arranged is staggered; and/or, along the axial direction, the support arch lengths L of the support arches of two adjacent rows are unequal, and in the two rows of support arches of one row at intervals, the support arch circumferential arc lengths L of the two rows of support arches are equal.
11. An electric motor, characterized in that: a radial foil gas dynamic bearing comprising any one of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322584691.1U CN220890821U (en) | 2023-09-22 | 2023-09-22 | Radial foil gas dynamic pressure bearing and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322584691.1U CN220890821U (en) | 2023-09-22 | 2023-09-22 | Radial foil gas dynamic pressure bearing and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220890821U true CN220890821U (en) | 2024-05-03 |
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ID=90870700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322584691.1U Active CN220890821U (en) | 2023-09-22 | 2023-09-22 | Radial foil gas dynamic pressure bearing and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220890821U (en) |
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2023
- 2023-09-22 CN CN202322584691.1U patent/CN220890821U/en active Active
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