CN114294319A - High-damping type novel gas foil radial bearing - Google Patents
High-damping type novel gas foil radial bearing Download PDFInfo
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- CN114294319A CN114294319A CN202111679869.XA CN202111679869A CN114294319A CN 114294319 A CN114294319 A CN 114294319A CN 202111679869 A CN202111679869 A CN 202111679869A CN 114294319 A CN114294319 A CN 114294319A
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- 239000011888 foil Substances 0.000 title claims abstract description 185
- 238000013016 damping Methods 0.000 title claims abstract description 36
- 238000003466 welding Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 17
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The invention relates to a novel high-damping gas foil radial bearing, belonging to the technical field of air bearings and aiming at effectively improving the damping effect of the gas foil radial bearing so as to improve the high-speed stability of a shafting. The invention comprises a bearing sleeve, a corrugated foil, and a top foil with a throttling hole. In order to improve the damping of the aerodynamic radial foil bearing, the invention uses the throttling hole effect of a static pressure gas bearing for reference, a plurality of throttling small holes are formed on the top foil of the original bearing, and through the structure, when the rotating shaft vibrates at high frequency, gas in the working gap of the bearing is extruded by the rotating shaft and flows through the small holes on the surface of the top foil, and through the throttling effect generated by the throttling holes, the energy generated by the vibration of a shafting is consumed, so that the damping effect of the bearing is improved, and the high-speed stability of the shafting is improved.
Description
Technical Field
The invention belongs to the technical field of air bearings, and particularly relates to a high-damping type novel gas foil radial bearing.
Background
With the continuous development of modern science and technology, high-speed rotating machinery plays an increasingly important role in the fields of aviation, aerospace, new energy, environmental protection equipment and the like, and the performance of a bearing as a supporting part of the rotating machinery is directly related to the performance of the rotating machinery. The gas foil bearing uses gas as a lubricant, and therefore has advantages of high rotation accuracy, low friction power consumption, no need for maintenance, and the like. However, as the gas is used as a compressible lubricant, the condition of insufficient damping of the bearing is easy to occur, so that the bearing generates large-amplitude vibration and even the shafting is unstable.
Therefore, it is very critical for the gas foil bearing how to improve the damping of the aerodynamic radial foil bearing. Only by improving the damping effect of the bearing, the high-speed stability of the shafting can be improved, and the application and development of the gas foil bearing are expanded.
The prior art with publication date of 2021, 01 month and 08 date and document number of CN112196890A discloses a radial gas foil bearing, which comprises a bearing sleeve, a top foil, a bottom foil and a foil elastic assembly, wherein the bearing sleeve, the top foil, the bottom foil and the foil elastic assembly are all arranged in a cylindrical shape with two open ends, the bearing sleeve, the bottom foil, the foil elastic assembly and the top foil are sequentially sleeved from outside to inside, and the bottom foil, the foil elastic assembly and the top foil are detachably connected with the inner side wall of the bearing sleeve; the elastic components of the foils can generate elastic deformation and mutual friction, and the elastic deformation and mutual friction are used for increasing the damping of the bearing. In view of the prior art, the bearing is complex in structure and formed by overlapping foil sheets with different layers, and the surface of the bearing sleeve is complex to machine, so that the manufacturing cost is high. From the point of view of bearing performance, the supporting foil 5 used in the drawing of this document is empirically difficult to deform and inherently less rigid than a corrugated foil, and it is difficult to provide sufficient load-bearing capacity, even though the foils 3 and 4 are used to increase the rigidity as described in this patent document, there is a great disadvantage in its performance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
the invention aims to provide a novel high-damping gas foil radial bearing to further effectively improve the damping effect of the gas foil radial bearing, so that the high-speed stability of a shafting is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a novel gas foil dynamic pressure journal bearing of high damping formula, includes bearing housing, ripple foil, top foil, in top foil installation bearing housing, still install the ripple foil between bearing housing and the top foil, be equipped with a plurality of orifices on the top foil.
The bearing sleeve is a hollow cylinder used for fixing the corrugated foil and the top foil.
The inner wall of the bearing sleeve is at least provided with a cuboid groove along the length direction for inserting a folded angle of the corrugated foil and the flat foil to fix the corrugated foil and the top foil with the throttling hole; the length in cuboid groove is the same with bearing housing length, and the cuboid groove just is linked together with the bearing housing inner chamber and is the open state, and the axis direction at cuboid groove edge its place is parallel to each other with the axis of bearing housing.
The corrugated foil is of a hollow cylindrical structure which is not closed in the circumferential direction, the surface of the corrugated foil is provided with corrugations parallel to the center line of the bearing sleeve, and the size of the outer diameter of the corrugated foil is smaller than the size of the inner diameter of the bearing sleeve.
The fixing mode of the corrugated foil on the bearing sleeve can adopt two different modes: one end of the bearing sleeve which is not closed in the circumferential direction is folded outwards to form a corrugated foil break angle, the length of the break angle is consistent with that of the bearing sleeve, and the break angle is inserted into the rectangular groove of the bearing sleeve for fixing; or the outer surface of any end which is not closed in the circumferential direction is fixed on the inner wall of the bearing sleeve in a welding mode.
The top foil with the throttling hole is of a cylindrical hollow cylinder structure which is not closed in the circumferential direction, one end of the top foil is provided with a bevel which is inserted into a cuboid groove in the bearing sleeve and used for fixing the top foil, and the length of the bevel is consistent with that of the bearing sleeve; the top foil with the orifice is located inside the corrugated foil, and the outer surface of the top foil is in contact with the inner surface of the corrugated foil.
N rows of orifices are arranged on the inner wall of the top foil with orifices in the circumferential direction (each row of orifices is distributed in the circumferential direction), and each row of orifices is respectively positioned at the positions of 1/(N +1) and 2/(N +1) … … N/(N +1) in the axial direction of the bearing; if the orifice is a single-row orifice, the orifice is located at the middle position in the axial direction of the top foil, if the orifice is a double-row orifice, the orifice is located at the positions 1/3 and 2/3 in the axial direction of the top foil, if the orifice is a triple-row orifice, the orifice is located at the positions 1/4, 1/2 and 3/4 in the axial direction of the top foil, the diameter of the orifice is 0.05-1 mm, the arc length D of the circle center of each row of circumferentially adjacent orifices is larger than D, and D is the diameter of the orifice.
The structure of the bearing comprises three different forms, namely a single-pad bearing, a double-pad bearing and a three-pad bearing, and a bearing sleeve, a corrugated foil and a top foil with a throttling hole which correspond to the bearings respectively have three forms, namely: a cuboid groove is formed in any one position in the circumferential direction, two positions corresponding to the circumferential direction are respectively formed in the cuboid groove, and a cuboid groove is formed in each trisection position in the circumferential direction; corrugated foil: single, double and triple tile; top foil with orifice: single, double and triple tile.
In each structure form, the throttling holes can be arranged in N rows, and the specific structure form is determined according to the size of the bearing.
The corrugated foil is clamped between the bearing sleeve and the top foil through the top foil, the top foil is contacted with or propped against the wave crests of the corrugated foil, and each orifice position corresponds to the wave trough of the corrugated foil.
The invention has at least the following beneficial technical effects:
the invention improves the damping of the aerodynamic radial foil bearing by using the throttling hole effect of the static pressure gas bearing, a plurality of throttling small holes are arranged on the top foil of the original bearing, and the structure can ensure that gas in the working gap of the bearing is extruded by the rotating shaft to flow through the small holes on the surface of the top foil when the rotating shaft vibrates at high frequency, and the energy generated by the vibration of a shafting is consumed through the throttling effect generated by the throttling holes, thereby improving the damping effect of the bearing and improving the high-speed stability of the shafting.
In order to improve the damping of the aerodynamic radial foil bearing, a plurality of throttling small holes are formed in the top foil of the original bearing, so that when the bearing vibrates or vibrates at high frequency, air flows on the upper surface and the lower surface of the top foil mutually, and the energy generated by the vibration of the bearing is consumed through the throttling effect generated by the throttling holes, so that the damping effect of the bearing is improved, a shafting is stabilized, and the instability of the shafting is avoided.
Drawings
FIG. 1 is an illustration of the lower bearing structure of three different pads of the present invention: FIG. 1(a) is a schematic view of a single pad bearing before assembly, FIG. 1(b) is a schematic view of a double pad bearing before assembly, and FIG. 1(c) is a schematic view of a triple pad bearing before assembly;
FIG. 2 is a schematic view of the three types of orifice opening positions of a single-pad bearing: FIG. 2(a) is a schematic diagram showing a single row orifice opening position of a single-shoe bearing, FIG. 2(b) is a schematic diagram showing a double row orifice opening position of a single-shoe bearing, and FIG. 2(c) is a schematic diagram showing a three row orifice opening position of a single-shoe bearing;
fig. 3 is a schematic view of a bearing housing of the present invention: FIG. 3(a) is a schematic view of a single-shoe bearing sleeve, FIG. 3(b) is a schematic view of a double-shoe bearing sleeve, and FIG. 3(c) is a schematic view of a triple-shoe bearing sleeve;
FIG. 4 is a schematic representation of a top foil with an orifice of the present invention: FIG. 4(a) is a schematic view of a single-shoe orifice top foil, FIG. 4(b) is a schematic view of a double-shoe orifice top foil, and FIG. 4(c) is a schematic view of a triple-shoe orifice top foil;
FIG. 5 is a schematic representation of a corrugated foil of the present invention: FIG. 5(a) is a schematic view of a single-tile corrugated foil, FIG. 5(b) is a schematic view of a double-tile corrugated foil, and FIG. 5(c) is a schematic view of a triple-tile corrugated foil;
FIG. 6 is a schematic view of the orifice operation; FIG. 7 is a schematic view of the deployment of the top foil with an orifice;
in the figure: 1-a bearing sleeve; 2-a corrugated foil; 3-top foil with orifice; 4-orifice; 5-a cuboid groove.
Detailed Description
The following further describes the specific embodiments of the present invention with reference to the accompanying drawings 1 to 7 and technical solutions.
A high damping type novel gas foil dynamic pressure radial bearing comprises a bearing sleeve 1, a corrugated foil 2 and a top foil 3 with a throttling hole; the bearing sleeve 1 is a hollow cylinder for fixing the corrugated foil and the top foil, and a cuboid groove 5 for inserting a folded angle of the corrugated foil and the top foil to fix the corrugated foil 2 and the top foil 3 with a throttling hole is formed in the bearing sleeve 1; the cuboid groove 5 is communicated with the inside of the bearing sleeve and is in an open state, and the cuboid groove is parallel to the central axis of the bearing sleeve along the axial direction of the cuboid groove; the bearing of the invention has three different forms, namely a single pad bearing, a double pad bearing and a triple pad bearing, and the cuboid groove 5 formed in the bearing sleeve 1 also has three corresponding types: any one position in the circumferential direction is provided with a cuboid groove 5, two corresponding positions in the circumferential direction are respectively provided with the cuboid groove 5, and trisection positions in the circumferential direction are respectively provided with the cuboid grooves 5, as shown in the attached figure 3 in the specification.
The corrugated foil 2 is of a hollow cylindrical structure which is not closed in the circumferential direction, and the surface of the corrugated foil is provided with corrugations parallel to a neutral line of the bearing sleeve; the corrugated foil 2 can be fixed on the bearing sleeve in two different modes, one mode is that one end which is not closed in the circumferential direction is folded outwards to form a corrugated foil break angle, the length of the break angle is several millimeters and is determined by the size of the bearing and is inserted into the rectangular groove 5 of the bearing sleeve for fixing, and the other mode is that the outer surface of any end which is not closed in the circumferential direction is fixed on the inner wall of the bearing sleeve in a welding mode; the size of the outer diameter of the corrugated foil 2 is smaller than the size of the inner diameter of the bearing sleeve; the corrugated foil 2 also has three structural forms, which are respectively as follows: the single tile type, the double tile type and the triple tile type are shown in the attached figure 5 of the specification.
The top foil 3 with the throttling hole is of a cylindrical hollow cylinder structure which is not closed in the circumferential direction, one end of the top foil is provided with a bevel which is inserted into a cuboid groove in the bearing sleeve and used for fixing the top foil, and the lengths of the bevel are different and are determined by the size of the bearing; the top foil 3 with the orifice is positioned inside the corrugated foil, and the outer surface of the top foil is in contact with the inner surface of the corrugated foil; in the circumferential direction of the inner wall of the orifice-equipped top foil 3, there are N rows of orifices 4 (each row is arranged in the circumferential direction), and each row of orifices is located at a position 1/(N +1), 2/(N +1) … … N/(N +1) in the axial direction of the bearing, for example: if the number of the orifices is one, the orifices are located at the middle position of the top foil in the axial direction, if the number of the orifices is two, the orifices are located at the positions 1/3 and 2/3 of the top foil in the axial direction, if the number of the orifices is three, the orifices are located at the positions 1/4, 1/2 and 3/4 of the top foil in the axial direction, and the description of the embodiment shown in the attached figure 2 is only an example under 1-3 rows of orifices and does not contain all the N rows of orifices; the diameter D of each orifice 4 is 0.02-2 mm, and the arc length D of the circle center of each row of circumferentially adjacent orifices is larger than D, as shown in the attached figure 7 of the specification; the top foil 3 with the throttling hole also has three structural forms, namely: the single-tile type, the double-tile type and the triple-tile type are shown in the attached figure 4 of the specification.
Description of the drawings fig. 2 shows three views of the example under 1 to 3 rows of orifices and does not contain all N rows of orifices; the diameter of the throttling hole 4 is 0.05-1 mm, the arc length D of the circle center of each row of circumferentially adjacent throttling holes is larger than D, and D is the diameter of the throttling hole 4 as shown in the attached figure 7 of the specification.
According to the high-damping type novel gas foil dynamic pressure radial bearing, the corrugated foil 2 is clamped between the bearing sleeve 1 and the top foil 3 through the top foil 3, the top foil 3 is in contact with or abuts against the wave crest of the corrugated foil 2, and the position of each throttling hole 4 corresponds to the wave trough of the corrugated foil 2. The wave crests and wave troughs of the corrugated foil 2 are consistent in extension with the axial direction of the bearing sleeve 1. The size of the hole diameter of the orifice 4 is consistent with the opening width of the wave trough of the corrugated foil 2. Thus, the damping effect of the gas foil dynamic pressure radial bearing can be further improved.
The corrugated foil 2 is also provided with at least one long opening along the circumferential direction. The throttling holes 4 arranged in the circumferential direction of each row on the top foil 3 are staggered (arranged alternately) with the long openings on the corrugated foil 2. The damping device has the effects of reducing the vibration of the rotating shaft, stabilizing the shafting and improving the damping of the bearing.
As shown in the attached figure 6 of the specification, when the rotor rotates, air in the top foil 3 with the throttling hole of the bearing is compressed, and the air passes through the throttling hole in the top foil and then reaches the inner surface of the bearing sleeve. According to the invention, the top foil of the original bearing is provided with the plurality of small throttling holes, and through the structure, when the rotating shaft vibrates at high frequency, gas in the working gap of the bearing is extruded by the rotating shaft and flows through the small holes on the surface of the top foil, and through the throttling effect generated by the throttling holes, the energy generated by the vibration of the shafting is consumed, so that the damping effect of the bearing is improved, and the high-speed stability of the shafting is improved.
Experiments prove that in the gas foil radial bearing with the same structure, the damping effect of the bearing is improved by at least 2.5 times compared with the gas foil radial bearing without the throttle holes 4, wherein the top foil 3 of the gas foil radial bearing is provided with the three rows of throttle holes 4.
The high-damping novel gas foil dynamic pressure radial bearing can be divided into a single-pad type bearing, a double-pad type bearing and a three-pad type bearing, and in each structural form, the number of the arranged throttling holes can be N, and the specific structural form is determined according to the size of the bearing.
Claims (10)
1. The utility model provides a novel gas foil dynamic pressure journal bearing of high damping formula, includes bearing housing (1), ripple foil (2), top foil (3), in top foil (3) installation bearing housing (1), still install ripple foil (2), its characterized in that between bearing housing (1) and top foil (3): and a plurality of throttling holes (4) are formed in the top foil (3).
2. The high damping type new gas foil hydrodynamic radial bearing as claimed in claim 1, wherein the bearing housing (1) is a hollow cylinder for fixing a corrugated foil and a top foil.
3. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 2, wherein the inner wall of the bearing housing (1) is provided with at least one rectangular groove along the length direction thereof for inserting the folding angle of the corrugated foil and the flat foil to fix the corrugated foil (2) and the top foil (3) with the orifice; the length of cuboid groove (5) is the same with bearing housing (1) length, and cuboid groove 5 just is linked together with the bearing housing inner chamber and is the open state, and the axis direction at cuboid groove edge its place is parallel to each other with the axis of bearing housing.
4. The high damping type new gas foil hydrodynamic radial bearing as claimed in claim 1, characterized in that the corrugated foil (2) is a hollow cylinder structure that is not closed circumferentially, and has on its surface corrugations parallel to the center line of the bearing housing and the outer diameter is smaller than the inner diameter of the bearing housing.
5. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 4, characterized in that the way of fixing the corrugated foil (2) to the bearing housing (1) can take two different forms: one end of the bearing sleeve which is not closed in the circumferential direction is folded outwards to form a corrugated foil break angle, the length of the break angle is consistent with that of the bearing sleeve (1), and the break angle is inserted into the rectangular groove of the bearing sleeve for fixing; or the outer surface of any end which is not closed in the circumferential direction is fixed on the inner wall of the bearing sleeve in a welding mode.
6. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 1, wherein the top foil (3) with the orifice is a cylindrical hollow cylinder structure which is not closed circumferentially, one end of the top foil is provided with a break angle inserted into a rectangular groove in the bearing housing for fixing the top foil, and the length of the break angle is consistent with that of the bearing housing (1); a top foil (3) with orifices is located inside the corrugated foil, and the outer surface of the top foil is in contact with the inner surface of the corrugated foil.
7. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 6, wherein N rows of orifices 4 (each row of orifices 4 is distributed in the circumferential direction) are arranged on the inner wall of the top foil (3) with orifices in the circumferential direction, and each row of orifices is respectively located at the position of 1/(N +1), 2/(N +1) … … N/(N +1) in the axial direction of the bearing; if the throttling holes are one row of throttling holes, the throttling holes are located in the middle position of the top foil in the axial direction, if the throttling holes are two rows of throttling holes, the throttling holes are located in the positions 1/3 and 2/3 of the top foil in the axial direction, if the throttling holes are three rows of throttling holes, the throttling holes are located in the positions 1/4, 1/2 and 3/4 of the top foil in the axial direction, the diameter of each throttling hole (4) is 0.05-1 mm, the arc length D of the circle center of each row of circumferentially adjacent throttling holes is larger than D, and D is the diameter of each throttling hole 4.
8. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 1 or 7, wherein the structure of the bearing comprises three different forms, namely a single-pad bearing, a double-pad bearing and a triple-pad bearing, and the corresponding bearing sleeve (1), the corrugated foil (2) and the top foil (3) with the orifice are respectively provided with three forms, wherein the bearing sleeve (1): a cuboid groove (5) is formed in any one position in the circumferential direction, two corresponding positions in the circumferential direction are respectively provided with a cuboid groove (5), and trisection positions in the circumferential direction are respectively provided with a cuboid groove (5); corrugated foil (2): single, double and triple tile; orifice top foil (3): single, double and triple tile.
9. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 8, wherein the number of the orifices formed in each of the structural forms is N, and the specific structural form is determined according to the size of the bearing.
10. The high damping type novel gas foil hydrodynamic radial bearing as claimed in claim 1, wherein the corrugated foil (2) is sandwiched between the bearing housing (1) and the top foil (3) by the top foil (3), the top foil (3) is in contact with or abuts against the wave crests of the corrugated foil (2), and each orifice (4) is located to correspond to the wave trough of the corrugated foil (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111679869.XA CN114294319A (en) | 2021-12-31 | 2021-12-31 | High-damping type novel gas foil radial bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111679869.XA CN114294319A (en) | 2021-12-31 | 2021-12-31 | High-damping type novel gas foil radial bearing |
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| Publication Number | Publication Date |
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| CN114294319A true CN114294319A (en) | 2022-04-08 |
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| CN202111679869.XA Pending CN114294319A (en) | 2021-12-31 | 2021-12-31 | High-damping type novel gas foil radial bearing |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210060347A (en) * | 2019-11-18 | 2021-05-26 | 한양대학교 에리카산학협력단 | Hybrid Fluid Film Bearing |
| 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 |
| CN113513530A (en) * | 2021-05-21 | 2021-10-19 | 江苏毅合捷汽车科技股份有限公司 | Porous radial wave foil gas bearing |
| CN214788550U (en) * | 2021-04-16 | 2021-11-19 | 河北金士顿科技有限责任公司 | Radial foil dynamic pressure air bearing capable of improving stable operation capability of shafting |
| CN113685432A (en) * | 2020-05-19 | 2021-11-23 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Gas bearing |
-
2021
- 2021-12-31 CN CN202111679869.XA patent/CN114294319A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210060347A (en) * | 2019-11-18 | 2021-05-26 | 한양대학교 에리카산학협력단 | Hybrid Fluid Film Bearing |
| CN113685432A (en) * | 2020-05-19 | 2021-11-23 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Gas bearing |
| 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 |
| CN214788550U (en) * | 2021-04-16 | 2021-11-19 | 河北金士顿科技有限责任公司 | Radial foil dynamic pressure air bearing capable of improving stable operation capability of shafting |
| CN113513530A (en) * | 2021-05-21 | 2021-10-19 | 江苏毅合捷汽车科技股份有限公司 | Porous radial wave foil gas bearing |
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