CN-121977839-A - Magnetic water composite bearing test bed capable of reconstructing magnetic steel array

CN121977839ACN 121977839 ACN121977839 ACN 121977839ACN-121977839-A

Abstract

The invention belongs to the field of water lubricated bearings, and discloses a magnetic water composite bearing test bed with a reconfigurable magnetic steel array, which comprises a precise optical platform, a driving transmission assembly, a multidimensional load loading assembly and a tested magnetic water composite bearing assembly, wherein the driving transmission assembly, the multidimensional load loading assembly and the tested magnetic water composite bearing assembly are installed and fixed on the precise optical platform, the driving transmission assembly and the tested magnetic water composite bearing assembly are sequentially arranged along the same horizontal axis, the output end of the driving transmission assembly is connected with an intermediate diaphragm coupler through flat key fit, the intermediate diaphragm coupler is connected with a stern shaft of the tested magnetic water composite bearing assembly through flat key fit, the multidimensional load loading assembly is arranged right above the tested magnetic water composite bearing assembly in space arrangement, and the loading output end of the multidimensional load loading assembly is connected with an upper section stator of the tested magnetic water composite bearing assembly through a servo electric cylinder connecting plate. The invention has the advantages of double reconstruction of magnetic circuit topology and microscopic air gap, true loading mode, accurate working condition simulation, convenient disassembly and maintenance and high experimental efficiency.

Inventors

YAN YING
WANG ZIXIAO
YUAN WENTAO
CHENG XIKANG
ZHOU MENGDE
Yao Zhuoxin
JIN JINGHAO
ZHOU JIAJU
LIU WEI

Assignees

大连理工大学

Dates

Publication Date: 20260505
Application Date: 20260401

Claims (7)

1. The magnetic water composite bearing test bed with the reconfigurable magnetic steel array is characterized by comprising a precise optical platform (9), a driving transmission assembly, a multidimensional load loading assembly and a tested magnetic water composite bearing assembly, wherein the driving transmission assembly, the multidimensional load loading assembly and the tested magnetic water composite bearing assembly are fixedly arranged on the precise optical platform (9), the driving transmission assembly and the tested magnetic water composite bearing assembly are sequentially arranged along the same horizontal axis, the output end of the driving transmission assembly is connected with an intermediate diaphragm coupler (5) through flat key fit, the intermediate diaphragm coupler (5) is connected with a stern shaft (7) of the tested magnetic water composite bearing assembly through flat key fit, the multidimensional load loading assembly is arranged right above the tested magnetic water composite bearing assembly in space arrangement, and the loading output end of the multidimensional load loading assembly is connected with an upper section stator (32) of the tested magnetic water composite bearing assembly through a servo electric cylinder connecting plate (18).
2. The magnetic water composite bearing test bed with the reconfigurable magnetic steel array according to claim 1, wherein the driving transmission assembly comprises a variable frequency driving motor (1), a speed reducer (2), a front end diaphragm coupler (3), a torque sensor (4), an intermediate diaphragm coupler (5), a torque sensor support frame (13) and a variable frequency driving motor base (14), an output shaft of the variable frequency driving motor (1) is connected with an input end of the speed reducer (2) through flat key matching, an output shaft of the speed reducer (2) is connected with an input end of the front end diaphragm coupler (3) through flat key matching, an output end of the front end diaphragm coupler (3) is connected with an input side of the torque sensor (4) through flat key matching, an output end of the intermediate diaphragm coupler (5) is connected with a stern shaft (7) of the tested magnetic water composite bearing assembly through flat key matching, the variable frequency driving motor (1) and the speed reducer (2) are integrally connected with the variable frequency driving motor base (14), an output end of the front end diaphragm coupler (3) is connected with an input side of the torque sensor (4) through flat key matching, an output side of the torque sensor (4) is connected with an output side of the intermediate diaphragm coupler (5) through flat key matching, and the torque sensor is fixed on the precision support frame (9) through the torque sensor (9).
3. The magnetic water composite bearing test bed with the reconfigurable magnetic steel array according to claim 2, wherein the multidimensional load loading assembly comprises a first servo electric cylinder (15), a servo electric cylinder supporting frame (16), spoke type pressure sensors (17), a servo electric cylinder connecting plate (18), a servo electric cylinder gasket (19) and a second servo electric cylinder (20), wherein the servo electric cylinder supporting frame (16) is fixed on a precision optical platform (9), mounting inclined planes which are symmetrically distributed and have an inclination angle of 45 degrees relative to a horizontal plane are arranged at the top of the servo electric cylinder supporting frame (16), cylinders of the first servo electric cylinder (15) and the second servo electric cylinder (20) are respectively fixed on the two mounting inclined planes of 45 degrees, the servo electric cylinder gaskets (19) are respectively arranged between each cylinder and each mounting inclined plane, the cylinder body and the servo electric cylinder gasket (19) are connected with the mounting inclined planes, output ends of the first servo electric cylinder (15) and the second servo electric cylinder (20) are respectively connected with tail ends of the spoke type pressure sensors (17) on the same side, the spoke type pressure sensors (17) at the tail ends of the first servo electric cylinder (15) and the second servo electric cylinder (20) are respectively connected with the two corresponding electric connecting plates (18) of the servo electric cylinders, and the two magnetic water composite bearing test bed assemblies (32) are respectively connected with the servo electric connecting plates (18).
4. The reconfigurable magnetic steel array magnetic water composite bearing test stand of claim 3, wherein the tested magnetic water composite bearing assembly is composed of a base support module, a magnetic steel array mounting unit, and a composite bearing module.
5. The magnetic water composite bearing test stand with the reconfigurable magnetic steel array according to claim 4, wherein the basic supporting module comprises a head end supporting bearing seat (6), a stern end supporting bearing seat (8), a stern end bearing seat supporting frame (10), a magnetic water composite bearing supporting frame (11), a head end bearing seat supporting frame (12), a water inlet (21), a flange end cover (22), a lip sealing ring (23), a water outlet (24), a head end water film pressure sensor (25), a middle section water film pressure sensor (26), a stern end water film pressure sensor (27), a stern end temperature sensor (28), a middle section temperature sensor (29), a head end temperature sensor (30), a lower section stator (31), an upper section stator (32) and a U-shaped sealing ring (40), wherein the lower section stator (31) is connected with the top surface of the magnetic water composite bearing supporting frame (11), the magnetic water composite bearing supporting frame (11) is fixed on a precise optical platform (9), the upper section stator (32) and the lower section stator (31) are assembled along a horizontal joint surface to form a complete magnetic water composite bearing supporting stator, and the upper section stator (32) and the lower section stator (31) are provided with corresponding annular grooves in an upper arc surface and an inclined plane, the upper arc surface of the upper section stator (31) and the lower section stator (31) are provided with an inclined annular grooves in an upper inclined plane, the servo electric cylinder connecting plate (18) is fixed on the mounting inclined plane, two end faces of the magnetic water composite bearing support stator are respectively connected with a flange end cover (22), an inner annular sealing groove and an outer annular sealing groove are respectively processed on an inner end face hole wall and an outer axial boss of the flange end cover (22), a U-shaped sealing ring (40) and a lip-shaped sealing ring (23) are respectively pressed into the inner annular sealing groove and the outer annular sealing groove in an interference fit mode, a water inlet (21) penetrates through an upper section stator (32) and is fixed on the inner wall of a rubber bearing bush (41), two water outlets (24) are respectively arranged and are respectively fixed on the flange end covers (22) at two ends, three threaded holes are formed in the bottom plane of a lower section stator (31) at equal intervals along the axial direction, a head end water film pressure sensor (25), a middle section water film pressure sensor (26) and a stern end water film pressure sensor (27) are respectively fastened in the corresponding threaded holes through external threads at the end parts of probes, three optical holes are formed in the side wall faces of a lower section stator (31) at equal intervals along the axial direction, the head end temperature sensor (30), the middle section temperature sensor (29) and the stern end temperature sensor (28) are fixed on the head end support frame (9) in a direct press fit mode through the corresponding optical bearing support frame (9), the head end supporting bearing seat (6) and the stern end supporting bearing seat (8) are respectively fixed on the head end bearing seat supporting frame (12) and the stern end bearing seat supporting frame (10).
6. The magnetic water composite bearing test bed with the reconfigurable magnetic steel array according to claim 5 is characterized in that the magnetic steel array mounting unit comprises a magnetic steel unit upper partition plate (43), a magnetic steel unit lower partition plate (44), a magnetic steel unit base (45) and a magnetic steel unit (42), wherein crossed positioning clamping grooves are formed in the top surface of the magnetic steel unit base (45), the magnetic steel unit lower partition plate (44) and the magnetic steel unit upper partition plate (43) are mutually orthogonal in an inserting mode and are jointly embedded and fixed in the positioning clamping grooves of the magnetic steel unit base (45), relative connection and fixation of the magnetic steel unit upper partition plate (43), the magnetic steel unit lower partition plate (44) and the magnetic steel unit base (45) are achieved, the magnetic steel unit upper partition plate (43), the magnetic steel unit lower partition plate (44) and the magnetic steel unit base (45) are mutually staggered to form four magnetic steel unit mounting cavities, and the four magnetic steel units (42) are respectively embedded and fixed in the four magnetic steel unit mounting cavities to form the magnetic steel array mounting unit with a complete single magnetic steel structure.
7. The magnetic water composite bearing test bed with the reconfigurable magnetic steel array according to claim 6, wherein the composite bearing module comprises a stern shaft (7), a locating pin (33), a stainless steel optical axis (34), a circumferential first magnetic steel array mounting unit (35), a circumferential second magnetic steel array mounting unit (36), a radial fourth magnetic steel array mounting unit (37), a radial third magnetic steel array mounting unit (38), a radial second magnetic steel array mounting unit (39) and a rubber bearing bush (41), wherein the rubber bearing bush (41) is embedded in a matching groove in an inner cavity of a magnetic water composite bearing supporting stator, so that axial and circumferential limiting of the rubber bearing bush (41) is realized, a stern shaft (7) is assembled in an inner hole of the rubber bearing bush (41) through clearance fit, 8 magnetic steel array mounting units are arranged in a matrix mode in space, each 4 magnetic steel array mounting units are arranged in a row in the axial direction, two axial array groups are arranged in total, the two axial array groups take the vertical center plane of the rubber bearing bush (41) as a left-right center plane, the two axial array units are arranged in a preset optical axis (34) in a serial mode, the two axial array units are arranged in the same optical axis (4) in a preset array is arranged in a serial mode, the two array units are arranged in the same optical axis (4) in a high rigidity array mode in the whole is arranged in the axial array mode in the same mode, the magnetic steel array mounting device is embedded in an annular mounting cavity reserved between the inner wall of the upper section stator (32) and the outer wall of the rubber bearing bush (41), a plurality of radial unthreaded holes are formed in the top shell of the upper section stator (32), and a plurality of positioning pins (33) respectively penetrate through the radial unthreaded holes of the upper section stator (32) and are inserted into positioning blind holes at the upper end of each magnetic steel unit base (45) so as to realize rigid fixation of all the magnetic steel array mounting units in the axial direction and the circumferential direction inside the stator.

Description

Magnetic water composite bearing test bed capable of reconstructing magnetic steel array Technical Field The invention belongs to the field of water lubrication bearings, and relates to a magnetic water composite bearing test bed with a reconfigurable magnetic steel array. Background The water lubrication bearing takes water as a lubrication medium, has the remarkable advantages of environmental friendliness, no pollution, flame retardance, low maintenance cost and the like, and is widely applied to the fields of ship propulsion systems, hydroelectric generating sets, marine military and the like. However, because the viscosity of water is low (only a few tenths to a few hundredths of oil), the hydrodynamic effect of the water-lubricated bearing is weak, the bearing capacity is obviously lower than that of the oil-lubricated bearing, dry friction or boundary lubrication is easy to occur under the working condition of low speed and heavy load, and the bearing bush is in direct contact with the stern shaft due to poor lubrication state, so that serious abrasion occurs. In order to improve the lubrication bearing performance of the water lubrication bearing, the prior art mainly focuses on surface texture processing of the bearing bush, design of different forms of flow guide grooves, adoption of a multilayer composite bearing bush structure and other improvement modes. At present, the research on the improved technology is relatively mature, and the lifting space gradually tends to be saturated. On the basis, the novel structure of the permanent magnet water lubrication bearing as the water lubrication bearing attracts wide attention of researchers, and the working mechanism is that the magnetic force generated by the permanent magnet is utilized to play an auxiliary supporting role on the stern shaft so as to share part of radial load, thereby reducing direct contact between the journal and the bearing bush. Under the same condition, the structure can effectively reduce the load born by the water lubrication bearing and improve the lubrication state in the bearing bush movement process. Although the bearing performance of the permanent magnetic water lubrication bearing is obviously improved compared with that of the traditional water lubrication bearing, the operation mechanism of the permanent magnetic water lubrication bearing relates to a complex magnetic-fluid-solid-thermal multi-field coupling effect. Particularly, in the actual service process, the permanent magnet is frequently subjected to 'local irreversible demagnetization' due to high temperature, vibration or seawater corrosion, so that the magnetic center and the geometric center deviate, and complex nonlinear vibration is caused. At present, theoretical researches often assume that all magnetic steels have consistent performance and uniform air gaps, and researches on macroscopic parameters such as magnetic force ratio, magnetic pole distribution sector angle and the like relate to, but lack systematic experimental verification and quantitative analysis aiming at microscopic influence mechanisms of non-uniform air gap distribution, local demagnetizing faults and magnetic conduction medium difference among magnetic poles on water film distribution characteristics and bearing capacity of a water lubrication bearing. However, the conventional water-lubricated bearing test bed is difficult to meet the requirements of developing deep system research on the magnetic water composite bearing in terms of magnetic field parameter configuration and experimental load conditions. In terms of magnetic field parameter configuration, the magnetic steel units of the traditional test stand are usually fixed in an irreversible manner such as gluing, interference or embedding, so that the magnetic circuit topology is permanently cured once assembled. More critical is that the mounting position of the magnetic steel of the existing test bed is usually rigid and fixed, and the radial height of the magnetic pole cannot be finely adjusted on the premise of not replacing the magnetic steel, which means that the microcosmic coupling sensitivity of the magnetic steel air gap-water film thickness cannot be explored, and common fault conditions such as 'local demagnetization' or 'magnetic center deviation' cannot be physically simulated by changing the magnetic air gap of a specific sector. In the aspect of experimental load conditions, a traditional water lubrication bearing test bed usually adopts a static loading mode in a single direction, such as gravity loading in a vertical direction and simple linear loading in a horizontal direction, the loading mode is relatively simple, complex stress conditions (such as nonlinear radial disturbance, axial disturbance, eccentric excitation, time-varying load caused by fluid excitation and the like) of a ship stern shaft under actual working conditions are difficult to truly simulate, and simultaneously, unexpected effects such