CN114941657B - Bearing pedestal suitable for assembling insert and air bearing based on bearing pedestal - Google Patents
Bearing pedestal suitable for assembling insert and air bearing based on bearing pedestal Download PDFInfo
- Publication number
- CN114941657B CN114941657B CN202210532931.0A CN202210532931A CN114941657B CN 114941657 B CN114941657 B CN 114941657B CN 202210532931 A CN202210532931 A CN 202210532931A CN 114941657 B CN114941657 B CN 114941657B
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- Prior art keywords
- insert
- bearing seat
- bearing
- foil
- groove
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/042—Sliding-contact bearings for exclusively rotary movement for axial load only with flexible leaves to create hydrodynamic wedge, e.g. axial foil bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
Abstract
The invention relates to an air bearing, in particular to a bearing seat suitable for assembling an insert and an air bearing comprising the same, wherein the bearing seat comprises a disc-shaped bearing seat body, a bearing seat mounting groove is formed on the disc surface of the bearing seat body, the axial lead of the bearing seat mounting groove is collinear with the axial lead of the bearing seat body, and the air bearing is different from the prior art in that: the bottom wall of the bearing seat mounting groove extends upwards to form N body bosses which are the same in shape and are in a fan shape, a fan-shaped bearing seat embedded groove is formed on each body boss and close to one side straight edge of each body boss, and a screw through hole is formed in the middle of the bottom of the bearing seat embedded groove; n is more than or equal to 3. Compared with the prior art, the bearing seat embedded groove is suitable for assembling the embedded block, a bottom plate in the prior art is omitted, and parts and processing cost are saved. The corrugated foil is sleeved on the insert, welding is not needed, and deformation of the corrugated foil caused by welding is avoided.
Description
Technical Field
The invention relates to an air bearing, in particular to a bearing seat suitable for assembling an insert and an air bearing comprising the same.
Background
The invention patent of publication number CN112879318A discloses a high-speed centrifugal compressor, and specifically discloses a thrust air bearing which comprises a bottom plate, a middle supporting piece and a top foil, wherein the bottom plate is annular, a plurality of cooling grooves are formed in the circumference of the bottom plate, and a plurality of fixed mounting holes are formed in the outer edge of the bottom plate; the middle supporting piece comprises a plurality of supporting foils and elastic foils, the supporting foils and the elastic foils are fixed on the bottom plate in a spot welding mode, and the supporting foils and the elastic foils are in groups for supporting the top foil; the top foil comprises a plurality of single foils which are arranged in a ring shape, and two adjacent single foils are flexibly connected to form an integral top foil structure.
The invention patent of publication No. CN108286567A discloses a thrust foil dynamic pressure air bearing with a thick top foil structure, which comprises a bottom plate, a supporting wave foil and a top foil, wherein the circular bottom plate is arranged below, a plurality of fan-shaped top foils are fixed above the bottom plate, the supporting wave foil is assembled between the bottom plate and the top foil, the thrust foil dynamic pressure air bearing also comprises an inlet section gasket arranged at one radial side of the joint of the top foil and the bottom plate, the thickness of the inlet section gasket is adjustable, and the supporting wave foil and the top foil are in pre-tightening assembly.
The technical scheme disclosed in the patent comprises a bottom plate, the corrugated foil and the top foil are directly or indirectly connected with the bottom plate, and the bottom plate is fixedly connected on a diffuser or a bearing seat through screws in general, so that limited space is occupied, and the screws are loosened and broken under the action of long-term dynamic load, so that the stability of the whole system of the gas compressor is affected. Moreover, the supporting corrugated foil is easy to deform due to welding, so that the corrugated foil is tilted, and finally, the top wave is uneven, and the air film is uneven during operation.
Disclosure of Invention
In order to overcome one of the defects or the defects in the prior art, the invention discloses a bearing seat suitable for assembling an insert, which adopts the following technical scheme:
the utility model provides a be suitable for bearing frame of assembly mold insert, includes discoid bearing frame body, sets up the air bearing mounting groove on the quotation of bearing frame body, and the axial lead of air bearing mounting groove is collinear with the axial lead of bearing frame body, and it is different with prior art: the bottom wall of the air bearing mounting groove extends upwards to form N body bosses which are the same in shape and are in a fan shape, a fan-shaped bearing seat embedded groove is formed on each body boss and close to one side straight edge of each body boss, and a screw through hole is formed in the middle of the groove bottom of the bearing seat embedded groove; n is more than or equal to 3.
Further, an air guide channel is formed between the body boss and the side wall of the air bearing mounting groove and between the adjacent body bosses.
Further, a main shaft hole is formed in the center of the bearing seat body, and a key groove is formed in the side wall of the main shaft hole; annular air guide grooves are formed in the disc surface of the bearing seat body and close to the edge of the bearing seat body, the annular air guide grooves are spaced with the air bearing mounting grooves, and N air guide holes with openings in the circumferential circular surface of the bearing seat body penetrate through the annular air guide grooves and the air bearing mounting grooves.
The invention also discloses an air bearing based on the bearing seat suitable for assembling the insert, which comprises
A top foil;
the N corrugated foil monomers, one side of each corrugated foil monomer extends outwards with the same curvature to form a non-wave band, and 1 corrugated foil through hole similar to the embedding groove of the bearing seat is formed in the non-wave band;
the top surface of each insert extends upwards to form an insert bulge similar to the shape of the bearing seat insert groove, and the height of the insert bulge is greater than or equal to the thickness of the corrugated foil monomer; the middle part of the insert is vertically provided with a screw hole; the N inserts are respectively placed in the N bearing seat insert grooves;
the N screws penetrate through screw through holes in the back of the bearing seat body and are screwed with the screw holes;
the N corrugated foil monomers are respectively sleeved on the N inserts through corrugated foil through holes on the N corrugated foil monomers; the top end of each insert and/or the protruding top end of each insert is fixedly connected with the top foil through spot welding.
Further, the top foil comprises N top foil units, each top foil unit comprises a fixed section, an abutting section higher than the fixed section, and a turning section which integrally connects the fixed section and the abutting section, and the distance between the lower surface of the fixed section and the lower surface of the abutting section is smaller than the wave height of the wave foil unit; the N top foil single fixing sections are fixedly connected with the top ends of the N inserts and/or the top ends of the protrusions of the inserts through laser spot welding respectively.
Further, the top foil comprises N top foil monomers, and two adjacent top foil monomers are connected into a whole through a waveform lacing to form a ring shape; the edges of the same side of the N top foil monomers are fixedly connected with the top ends of the N inserts and/or the top ends of the protrusions of the inserts through laser spot welding.
Further, the wave tie includes an inner tie adjacent the inner loop and an outer tie adjacent the outer loop.
Further, the N inserts are respectively in transition fit or clearance fit with the N bearing seat insert grooves, and are glued through high-temperature resistant glue.
Further, the height of the insert is greater than the depth of the bearing seat insert pocket.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the bottom plate of the prior art is saved, and parts and processing cost are saved.
2. The corrugated foil is sleeved on the insert, welding is not needed, and deformation of the corrugated foil caused by welding is avoided.
3. The corrugated foil is sleeved on the insert, the insert is used for limiting the corrugated foil radially and axially, welding fixation is not needed, the possibility that the corrugated foil falls off due to off-welding is avoided, the operation is more reliable, the extension and retraction of the free end of the corrugated foil are not limited, and corresponding elasticity and damping are provided.
4. The corrugated foil is sleeved on the insert, so that the surface flatness of bearing assembly is improved, the uniformity of stress and friction is improved, the abrasion is reduced, and the service life is prolonged.
5. The bottom plate in the prior art is saved, the space is saved, and the miniaturization and the light weight of the gas compressor are facilitated.
6. Simple structure, easy to assemble.
Drawings
Fig. 1 is a schematic view of the structure of a bearing housing of the present invention.
Fig. 2 is a schematic view of a bearing housing according to another view of the present invention.
FIG. 3 is a schematic diagram of the structure of a wave foil unit of the present invention.
Fig. 4 is a schematic view of the structure of the insert of the present invention.
FIG. 5 is a schematic structural diagram of the top foil unit in example 2.
Fig. 6 is a schematic structural diagram of the bearing housing in example 2 assembled with the corrugated foil unit, the insert and the top foil unit.
Fig. 7 is a schematic structural view of the top foil in example 3.
Fig. 8 is a schematic view of the structure of the bearing housing in example 3 after assembly with the corrugated foil unit, insert and top foil.
Detailed Description
The present invention will be further described with reference to the drawings by taking the bearing housing body 100 as an example.
An air guide channel 107 is formed between the body boss 106 and the side wall of the air bearing mounting groove 104 and between adjacent body bosses 106.
The center of the bearing seat body 100 is provided with a main shaft hole 101, and the side wall of the main shaft hole 101 is provided with a key slot 102; an annular air guide groove 103 is formed on the disc surface of the bearing seat body 100 and close to the edge of the disc surface, the annular air guide groove 103 is opposite to the air bearing mounting groove 104, and 6 air guide holes 105 which are opened on the circumferential circular surface of the bearing seat body 100 penetrate through the annular air guide groove 103 and the air bearing mounting groove 104.
The bearing seat of the embodiment can be integrally machined to finish a plane and a milling groove, and tolerance precision of each insert positioning surface matched with the bearing seat can be ensured.
Example 2 an air bearing based on example 1, shown in FIGS. 3-6, suitable for mounting insert bearing blocks, comprising
6 corrugated foil units 1, wherein one side of each corrugated foil unit 1 extends outwards with the same curvature to form a non-wave band 11, and the non-wave band 11 is provided with 1 corrugated foil through hole 12 similar to the shape of the bearing seat embedded groove 108;
6 inserts 2, wherein the top surface of each insert 2 extends upwards to form an insert protrusion 22 similar to the shape of the bearing seat insert groove 108, and the height of the insert protrusion 22 is greater than or equal to the thickness of the corrugated foil single body 1; the middle part of the insert 2 is vertically provided with a screw hole 21; the 6 inserts 2 are respectively placed in the 6 bearing seat insert grooves 108;
6 screws respectively penetrate through the screw through holes 109 on the back of the bearing seat body 100 and are in threaded connection with the screw holes 21; thereby fixing the insert 2 to the housing body 100.
The 6 corrugated foil monomers 1 are respectively sleeved on the 6 inserts 2 through corrugated foil through holes 12 on the corrugated foil monomers; the possibility of the open welding and falling off of the corrugated foil single body 1 is thoroughly eliminated.
A top foil 3; each top foil unit 31 comprises a fixed section 311, an abutting section 312 higher than the fixed section 311, and a turning section 313 which integrally connects the fixed section 311 and the abutting section 312, wherein the distance between the lower surface of the fixed section 311 and the lower surface of the abutting section 312 is smaller than the wave height of the wave foil unit 1; the fixing sections 311 of the 6 top foil units 31 are fixedly connected with the top ends of the 6 inserts 2 and/or the top ends of the insert protrusions 22 through laser spot welding respectively.
In another preferred embodiment, the 6 inserts 2 are respectively transition fit or clearance fit with the 6 bearing housing insert grooves 108 and glued by high temperature resistant glue.
In another preferred embodiment, the 6 inserts 2 are respectively in interference fit with the 6 bearing seat insert grooves 108, so that 6 screws can be omitted, and screw holes 21 are not required to be formed in the middle of the insert 2, and screw through holes 109 are not required to be formed in the middle of the bottom of the bearing seat insert grooves 108.
In another preferred embodiment, the height of the insert 2 is greater than the depth of the bearing housing insert pocket 108. The material of the insert 2 is selected from any suitable welding material such as stainless steel, carbon steel or high-temperature alloy, and is different from the common aluminum material of the bearing seat body 100, so that the welding is more convenient than the aluminum material, and the welding strength is higher.
After the 6 top foil units 31 are welded and fixed, the turning section 313 and the abutting section 312 of each top foil unit 31 are tilted upwards, and each top foil unit 31 presents a slope shape with one end being low and one end being high.
In order to conveniently describe the structural relationship between the corrugated foil unit 1, the insert 2 and the top foil unit 31 and the bearing seat body 100, in fig. 6, the insert 2 is not assembled in the bearing seat insert groove 108 at the lower right position, and the corrugated foil unit 1 is not sleeved nor welded nor is the top foil unit 31; an insert 2 is assembled in the bearing seat insert groove 108 at the right position, and a corrugated foil unit 1 is sleeved on the insert 2, but a top foil unit 31 is not welded; the insert 2 at other positions is completely provided with the wave foil single body 1, the insert 2 and the top foil single body 31. The small black dots in the figure are laser welded spots.
The air bearing of this embodiment is an air thrust bearing, when the main shaft drives the thrust disc located at the opposite side of the bearing seat body 100 to rotate, the thrust disc drives surrounding air to rotate simultaneously, when the air flowing in rotation flows through the annular top foils 3 with alternating heights, under the action of the adsorption effect of the boundary layer, a wedge-shaped air film is formed, thrust to be separated from each other is generated between the paired air thrust bearings, the faster the shaft rotates, the larger the generated thrust is correspondingly, the pressure of the air entering the wave grooves in the lower surface of each wave foil unit 1 is also, and each wave foil unit 1 can bear against each top foil unit 31 so as not to be collapsed, which is a dynamic balance process, in this process, the wave foil units 1 are deformed in a telescopic way by a small amplitude, and the wave heights have a small amplitude change so as to adapt to the change of the rotation speed of the shaft.
After welding, the lower surface of the annular top foil 3 is partially abutted against the top surface of the insert 2, and the wavy lacing 32 is naturally bent and deformed, so that the whole annular top foil 3 presents annular waves with alternating heights. Because the wavy lacing 32 has a traction effect on the adjacent top foil units 31, the top surface of the whole top foil is smoother, the uniformity of stress and friction is improved, the abrasion is reduced, and the service life is prolonged.
In order to conveniently describe the mutual structural relation of the corrugated foil single body 1, the insert 2 and the annular top foil 3 and the bearing seat, in fig. 8, the right side of the top foil 3 is half-cut, the insert 2 is not assembled in the bearing seat insert groove 108 at the lower position, a part of corrugated foil single bodies 1 sleeved on adjacent matched inserts 2 are shown, and the insert 2 is assembled in the right 1 bearing seat insert groove 108, so that the corrugated foil single bodies 1 are shown; the existing insert 2 in the upper right 1 bearing housing insert pocket 108 shows a portion of the corrugated foil element 1. The small black spots on the top foil 3 in the figure are laser welded spots.
The above embodiments are not to be taken as limiting the scope of the invention, and any alternatives or modifications to the embodiments of the invention will be apparent to those skilled in the art and fall within the scope of the invention. The present invention is not described in detail, but is well known in the art or common general knowledge.
Claims (8)
1. The utility model provides a be suitable for bearing frame of assembly mold insert, includes discoid bearing frame body (100), sets up air bearing mounting groove (104) on the quotation of bearing frame body (100), and the axial lead of air bearing mounting groove (104) is collinearly with the axial lead of bearing frame body (100), its characterized in that: the bottom wall of the air bearing mounting groove (104) extends upwards to form N identical fan-shaped body bosses (106), a fan-shaped bearing seat embedded groove (108) is formed on each body boss (106) near one side straight edge of the body boss, and a screw through hole (109) is formed in the middle of the groove bottom of the bearing seat embedded groove (108); n is more than or equal to 3;
Included
a top foil (3);
the device comprises N corrugated foil monomers (1), wherein one side of each corrugated foil monomer (1) extends outwards with the same curvature to form a non-wave band (11), and the non-wave band (11) is provided with 1 corrugated foil through hole (12) similar to a bearing seat embedding groove (108) in shape;
the top surface of each insert (2) extends upwards to form an insert protrusion (22) similar to the shape of the bearing seat insert groove (108), and the height of the insert protrusion (22) is greater than or equal to the thickness of the corrugated foil single body (1); screw holes (21) are vertically formed in the middle of the insert (2); the N inserts (2) are respectively arranged in the N bearing seat insert grooves (108);
n screws respectively penetrate through screw through holes (109) on the back of the bearing seat body (100) and are in threaded connection with the screw holes (21);
the N corrugated foil monomers (1) are respectively sleeved on the N inserts (2) through corrugated foil through holes (12) on the corrugated foil monomers;
the top end of each insert (2) and/or the top end of each insert bulge (22) is fixedly connected with the top foil (3) through spot welding.
2. A bearing housing adapted for mounting inserts according to claim 1, wherein: a bearing seat air guide channel (107) is formed between the body boss (106) and the side wall of the air bearing mounting groove (104) and between adjacent body bosses (106).
3. A bearing housing adapted for mounting inserts according to claim 1, wherein: a main shaft hole (101) is formed in the center of the bearing seat body (100), and a key slot (102) is formed in the side wall of the main shaft hole (101); annular air guide grooves (103) are formed in the disc surface of the bearing seat body (100) and close to the edge of the disc surface, the annular air guide grooves (103) are spaced from air bearing mounting grooves (104), and N air guide holes (105) which are formed in the circumferential circular surface of the bearing seat body (100) penetrate through the annular air guide grooves (103) and the air bearing mounting grooves (104).
4. A bearing housing adapted for mounting inserts according to claim 1, wherein: the top foil (3) comprises N top foil units (31), each top foil unit (31) comprises a fixed section (311), an abutting section (312) higher than the fixed section (311), and a turning section (313) which integrally connects the fixed section (311) and the abutting section (312), and the distance between the lower surface of the fixed section (311) and the lower surface of the abutting section (312) is smaller than the wave height of the Yu Bobo unit (1); the fixing sections (311) of the N top foil monomers (31) are fixedly connected with the top ends of the N inserts (2) and/or the top ends of the insert bulges (22) through laser spot welding respectively.
5. A bearing housing adapted for mounting inserts according to claim 1, wherein: the top foil (3) comprises N top foil monomers (31), and two adjacent top foil monomers (31) are connected into a whole through a waveform lacing (32) to form a ring shape; the same side edges of the N top foil monomers (31) are fixedly connected with the top ends of the N inserts (2) and/or the top ends of the insert protrusions (22) through laser spot welding.
6. A housing adapted for mounting inserts according to claim 5, wherein: the wave tie (32) includes an inner tie (321) adjacent the inner loop and an outer tie (322) adjacent the outer loop.
7. A bearing housing adapted for mounting inserts according to claim 1, wherein: the N inserts (2) are respectively in transition fit or clearance fit with the N bearing seat insert grooves (108) and are glued through high-temperature resistant glue.
8. A bearing housing adapted for mounting inserts according to claim 1, wherein: the height of the insert (2) is greater than the depth of the bearing seat insert pocket (108).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210532931.0A CN114941657B (en) | 2022-05-17 | 2022-05-17 | Bearing pedestal suitable for assembling insert and air bearing based on bearing pedestal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210532931.0A CN114941657B (en) | 2022-05-17 | 2022-05-17 | Bearing pedestal suitable for assembling insert and air bearing based on bearing pedestal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114941657A CN114941657A (en) | 2022-08-26 |
| CN114941657B true CN114941657B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210532931.0A Active CN114941657B (en) | 2022-05-17 | 2022-05-17 | Bearing pedestal suitable for assembling insert and air bearing based on bearing pedestal |
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| CN (1) | CN114941657B (en) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7922447B2 (en) * | 2007-07-24 | 2011-04-12 | Ming-Shing Kao | Fan bearing structure |
| CN101463868B (en) * | 2009-01-14 | 2010-07-21 | 西安交通大学 | Kinetic pressure gas thrust bearing with axial support |
| JP5765122B2 (en) * | 2011-08-01 | 2015-08-19 | 株式会社Ihi | Radial foil bearing |
| JP2013053645A (en) * | 2011-09-01 | 2013-03-21 | Ntn Corp | Thrust foil bearing |
| US9157473B2 (en) * | 2013-01-16 | 2015-10-13 | Korea Institute Of Machinery & Materials | Thrust bearing and combo bearing |
| US9470260B2 (en) * | 2014-09-26 | 2016-10-18 | Hamilton Sundstrand Corporation | Thrust bearing assembly |
| US9500202B1 (en) * | 2015-05-21 | 2016-11-22 | Summit Esp, Llc | Thrust bearing surface for floater-style centrifugal pumps |
| US9896965B2 (en) * | 2015-12-11 | 2018-02-20 | Hamilton Sundstrand Corporation | Thrust bearing assembly with flow path restriction |
| CN105443571B (en) * | 2015-12-26 | 2018-05-08 | 广东瑞荣泵业有限公司 | Well submersible motor water lubricating thrust bearing possessing |
| JP6891665B2 (en) * | 2017-06-27 | 2021-06-18 | 株式会社Ihi | Radial foil bearing |
| CN207652187U (en) * | 2017-12-06 | 2018-07-24 | 广州市昊志机电股份有限公司 | A kind of electro spindle |
| CN108253013A (en) * | 2017-12-13 | 2018-07-06 | 湖南大学 | It is a kind of can adaptively and with high bearing capacity thrust air foil bearing |
| CN109764057A (en) * | 2019-02-01 | 2019-05-17 | 西安交通大学 | A kind of multi stage resilient supporting mechanism and kinetic pressure gas thrust bearing |
| CN110030269A (en) * | 2019-04-24 | 2019-07-19 | 上海捷氢科技有限公司 | Elastic foil gas bearing and elastic foil gas bearing friction are secondary |
| CN111795062B (en) * | 2020-07-21 | 2022-07-29 | 河北金士顿科技有限责任公司 | Radial foil dynamic pressure air bearing |
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