CN-121993495-A - Bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slit

CN121993495ACN 121993495 ACN121993495 ACN 121993495ACN-121993495-A

Abstract

The invention belongs to the field of rotary mechanical bearing engineering and magnetic circuit design, and discloses a bearing bush magnetic circuit integrated structure with radial and axial compound vortex-suppressing slit. The partition magnetic guide embedded blocks are embedded into the bearing bush body in an annular multi-sector array and are symmetrically arranged between the left end face and the right end face of the bearing bush body along the axial direction, vortex suppressing slots are arranged at equal intervals along the circumferential direction of the bearing bush body, partition waterways are respectively arranged on the back sides of the partition magnetic guide embedded blocks, the compliant thin-wall areas are liquid film areas arranged between the bearing bush body and the partition magnetic guide embedded blocks, the magnetic flux converging windows are magnetic flux path areas with smaller magnetic resistance in the bearing bush body, the partition magnetic guide embedded blocks are correspondingly formed into a magnetic flux converging window and are distributed in the bearing bush body on the back sides of the partition magnetic guide embedded blocks, and the adjustable shielding plates are arranged in the axial center area of the bearing bush body in parallel to the surface of the bearing bush body.

Inventors

LIU WEI
WANG ZIXIAO
ZHANG HAOXUAN
YAN YING
ZHOU MENGDE
CHENG XIKANG
Yao Zhuoxin
LIANG ZHIHENG
WANG YUNING
HU CHENKAI

Assignees

大连理工大学

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots is characterized by comprising a bearing bush body, a partition magnetic guide insert, vortex suppression slots, a partition waterway, a compliant thin-wall area, a magnetic flux converging window and an adjustable shielding sheet; The partition magnetic guide embedded blocks are embedded into the bearing bush body in an annular multi-sector array and are symmetrically arranged between the left end face and the right end face of the bearing bush body along the axial direction; The vortex-suppressing slit comprises a radial penetrating slit and an axial semi-penetrating slit or an axial penetrating slit, and the two types of the radial penetrating slit and the axial semi-penetrating slit are arranged at 4-24 parts at equal intervals along the circumferential direction of the bearing bush body; The partition waterways are respectively arranged on the back sides of the partition magnetic guide embedded blocks; the compliant thin-wall area is a liquid film area arranged between the bearing bush body and the partitioned magnetic guide embedded blocks; The magnetic flux converging windows are magnetic flux path areas in the bearing bush body, and each partition magnetic guide insert is correspondingly formed into one magnetic flux converging window and distributed in the bearing bush body at the back side of the partition magnetic guide insert; The adjustable shielding piece is arranged in the axial central area of the bearing bush body in parallel with the surface of the bearing bush body.
2. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, Radial projections of the two types of vortex-inhibiting slots are not overlapped with each other, and circumferential spacing angles between adjacent vortex-inhibiting slots of the same type are 25% -75% of corresponding vortex-inhibiting slot pitches.
3. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The partition waterways are arranged in a bow shape or an arc shape, and each partition waterway is provided with an independent fluid outlet and an independent fluid outlet or are communicated with each other in series to form a whole; The shortest heat path between the center of the partitioned waterway and the back side of the partitioned magnetic conduction embedded block is not more than 3mm, and the Reynolds number Re of fluid in the partitioned waterway is controlled within the range of 200-1500.
4. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The circumferential thickness of the compliant thin-wall area is distributed in a quadratic function or piecewise linear manner along with the circumferential deflection angle theta of the liquid film from the central axis of the partitioned magnetic guide insert, and the compliant thin-wall area meets the requirement of compliance characteristics that the absolute value of deformation generated by the compliant thin-wall area is not less than 0.05 mu m when the liquid film pressure changes by 1 kPa.
5. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The installation position of the adjustable shielding sheet is adjusted by a spiral fine adjuster arranged in the middle of the adjustable shielding sheet, so that radial offset adjustment within the range of 0-1.0 mm is realized.
6. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The inside processing of axle bush body has the dovetail groove, and the subregion magnetic conductance abaculus adaptation inlays and inlays in the dovetail groove and realize radial fixation.
7. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 6, characterized in that, And a micro-pre-tightening elastic sheet is arranged between the dovetail groove and the matching surface of the partitioned magnetic guide embedding block, and the micro-pre-tightening elastic sheet applies continuous radial and circumferential pre-tightening force to the partitioned magnetic guide embedding block.
8. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The bearing bush body is made of PEEK, PI, ceramic, stainless steel and composite materials of the PEEK, PI, ceramic, stainless steel and the composite materials; The partitioned magnetic conductive embedded blocks adopt soft magnetic composite powder cores, electrical steel laminations or pure iron, and the relative magnetic permeability mu r is 200-6000.
9. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The inner circle working surface of the bearing bush body is provided with a microstructure groove and a micropore static pressure array, wherein the depth of the microstructure groove is 5-40 mu m, the included angle between two walls of the microstructure groove is 20-45 degrees, the aperture of the micropore is 0.08-0.30 mm, the surface density of the micropore is 5-25/cm 2 , and independent throttling arrangement of 2-8 areas is adopted.
10. The bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots according to claim 1, characterized in that, The bearing bush magnetic circuit integrated structure with the radial and axial compound vortex suppression slit is matched with an external permanent magnet ring or an electromagnetic coil for use, and after the magnetic flux density distribution is calibrated on site, the offset of the adjustable shielding sheet is adjusted to realize quick fine adjustment.

Description

Bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slit Technical Field The invention belongs to the field of rotary mechanical bearing engineering and magnetic circuit design, and relates to a bearing bush magnetic circuit integrated structure with radial and axial compound vortex-suppressing slit. Background The bearing is a core supporting component of various marine facilities and ship equipment, and the core indexes such as lubrication characteristic, service life, dynamic stability and the like are directly related to the safety and reliability of the equipment. The water lubrication and magnetic-water composite bearing is widely applied to ship propulsion, pumping and clean energy equipment due to the advantages of excellent environmental protection and low maintenance cost. The bearing bush of the bearing can form a static pressure or dynamic pressure water lubrication film with a liquid environment by means of the self structure and material characteristics so as to transfer load, and is matched with an internal or external magnetic field to provide preload and rigidity compensation, so that the friction loss between a shaft neck and the bearing bush is effectively reduced, the efficient and stable operation of a system is ensured, and therefore, the reasonable design of the bearing bush is of great importance. However, the traditional bearing bush structure has the key problems that firstly, a homogeneous matrix or a simple embedded magnetic guide piece is adopted, the magnetic circuit design cannot accurately regulate the air gap magnetic flux distribution of the bearing, local saturation and edge effect are extremely remarkable, secondly, the bearing bush body is easy to induce strong annular or axial eddy current under the action of a time-varying magnetic field and a rotating magnetic field, so that eddy current loss and temperature rise are caused, thermal instability is aggravated, magnet demagnetization and ageing failure of bearing bush surface materials are possibly induced, the service life of the bearing is greatly shortened, thirdly, the magnetic-fluid-solid coupling effect is not fully considered, the uneven thickness distribution of a liquid film causes vibration to increase, the bearing stability is damaged, fourthly, the cooling circuit and the magnetic guide insert are mutually split, the heat transfer path is long, heat dissipation is delayed, and the friction state of a shaft neck and the bearing bush is further deteriorated. Therefore, the bearing bush design industry is urgent to need an integrated design scheme of a bearing bush magnetic circuit, wherein the scheme is based on guaranteeing the core performance of a magnetic field, on the premise of guaranteeing stable magnetic flux bunching effect and magnetic rigidity meeting the use requirement, a closed vortex loop formed inside equipment is effectively cut off through optimizing structural layout, a near-source heat dissipation scheme is designed to enable heat generated by vortex to be rapidly taken away near a generation area, and meanwhile, a compliant structure and a working face microstructure design are fused to realize uniform distribution of lubricating film thickness and obviously reduce vibration amplitude in the running process of the equipment, so that the overall running stability is improved, and finally, the core aims of high-efficiency, reliable and long-service life running of the equipment are achieved. Disclosure of Invention The invention aims to provide a bearing bush magnetic circuit integrated structure with radial and axial compound vortex-inhibiting slit, which realizes the effective compression of the designable distribution and peak-valley difference of the magnetic flux density B (theta, z) in the bearing bush through the design of the magnetic circuit integrated structure, remarkably reduces the vortex loss and local heating by cutting off the annular and axial vortex loops through radial through slits and axial semi-through or through slits, improves the bearing pressure bearing stability by adjusting the thickness of a liquid film through a compliant thin-wall layer, and simultaneously combines the comprehensive performance goals of efficient cooling, low-pressure drop water channel design and maintainable assembly by depending on a subarea waterway and a subarea magnetic guide embedding block embedding structure comprising a dovetail groove and a micro-pre-tightening spring piece. The technical scheme of the invention is as follows: a bearing bush magnetic circuit integrated structure with radial and axial compound vortex suppression slots comprises a bearing bush body, a partitioned magnetic guide insert, vortex suppression slots, partitioned waterways, a compliant thin-wall region, a magnetic flux converging window and an adjustable shielding sheet; The partition magnetic guide embedded blocks are embedded into the bearing bush body in an