CN-121977751-A - Magnetic fluid dynamic sealing performance testing device

CN121977751ACN 121977751 ACN121977751 ACN 121977751ACN-121977751-A

Abstract

The invention discloses a magnetic fluid dynamic sealing performance testing device which comprises a simulation shaft, a transmission shaft, a sealing shell and a vacuum cover, wherein the transmission shaft is vertically arranged on a bracket and can rotate around an axis through motor driving, the simulation shaft is sleeved at the upper end of the transmission shaft, the outer peripheral wall of the simulation shaft is eccentric relative to the transmission shaft, the sealing shell is fixedly connected on the bracket and surrounds the outer side of the simulation shaft, magnetic fluid is filled between the inner peripheral wall of the sealing shell and the outer peripheral wall of the simulation shaft, the lower end of the simulation shaft is connected with the transmission shaft through an axially telescopic sealing coupler, an actuator is arranged between the simulation shaft and the bracket so as to drive the simulation shaft to move up and down along the transmission shaft, and the vacuum cover is arranged on the bracket and covers the sealing shell so as to form a sealing monitoring cavity. The invention can solve the problem of dynamic sealing performance test of the large-scale magnetic fluid sealing device under the combined working conditions of high-speed rotation, radial deflection and axial floating.

Inventors

HU GUN
LI XINYAO
Xu yuanheng
QI LIZI
CHEN LIANGJUN
Xue Jihang

Assignees

中国工程物理研究院总体工程研究所

Dates

Publication Date: 20260505
Application Date: 20260320

Claims (10)

1. The utility model provides a magnetic fluid dynamic seal performance testing arrangement, its characterized in that includes simulation axle, transmission shaft, seal housing and vacuum cover, the transmission shaft is along vertical setting on the support and accessible motor drive revolves around the axis, simulation axle suit is in the upper end of transmission shaft, the outer perisporium of simulation axle is eccentric state for the transmission shaft, seal housing fixed connection on the support and around the outside at the simulation axle, seal housing's inner perisporium with fill between the outer perisporium of simulation axle has the magnetic fluid, the lower extreme of simulation axle is connected with the transmission shaft through axial telescopic seal shaft coupling, be provided with the executor between simulation axle and the support to drive the up-and-down motion of simulation axle along the transmission shaft, the vacuum cover sets up on the support and covers in seal housing top, in order to form sealed monitoring cavity.
2. The magnetic fluid dynamic sealing performance testing device according to claim 1, wherein the simulation shaft comprises a sealing cylinder, a balancing cylinder and a cylinder seat, the center of the cylinder seat is provided with a through hole and sleeved on the transmission shaft, the sealing cylinder and the balancing cylinder are sequentially sleeved on the cylinder seat from outside to inside, the sealing cylinder is eccentrically arranged relative to the cylinder seat, and the balancing cylinder is reversely eccentrically arranged relative to the cylinder seat.
3. The device for testing dynamic sealing performance of magnetic fluid according to claim 1, wherein the actuator comprises a permanent magnet ring and an excitation ring, the permanent magnet ring is arranged on the analog shaft, the excitation ring is arranged on the bracket, and the excitation ring can drive the analog shaft to move up and down along the axial direction after being electrified.
4. The magnetic fluid dynamic sealing performance testing device according to claim 3, wherein the bracket comprises a base, a bearing seat and an excitation base, the bearing seat is arranged on the base, a bearing is arranged in the bearing seat and used for axially and radially supporting the transmission shaft, and the excitation base is arranged at the upper end of the bearing seat and used for installing the excitation ring.
5. The magnetic fluid dynamic sealing performance testing device according to claim 1, wherein the transmission shaft comprises a connecting section, a bearing section, a sealing section and a sliding section which are sequentially arranged from bottom to top, the connecting section is used for being connected with an output end of a motor, the bearing section is used for being in rotary connection with a support, the sealing section is used for being connected with a lower end of a sealing coupling, and the sliding section is used for being sleeved into the simulation shaft.
6. The device for testing dynamic sealing performance of magnetic fluid according to claim 1, further comprising a torque sensor, wherein the upper end of the torque sensor is connected with the lower end of the transmission shaft through a rigid coupling, and the lower end of the torque sensor is connected with the output shaft of the motor through an elastic coupling.
7. The magnetic fluid dynamic seal performance test apparatus according to claim 1, further comprising a displacement sensor provided on the bracket, and a measurement end of the displacement sensor is directed to an outer circumferential surface and an end surface of the dummy shaft to measure radial displacement and axial displacement of the dummy shaft.
8. The device for testing dynamic sealing performance of magnetic fluid according to claim 1, wherein the vacuum cover is provided with a mounting hole and a pumping hole, the mounting hole is connected with a vacuum gauge, and the pumping hole is used for pumping vacuum.
9. The magnetic fluid dynamic seal performance testing apparatus of claim 1, wherein the seal coupling comprises a bellows coupling or a tire coupling.
10. The device for testing dynamic sealing performance of magnetic fluid according to claim 1, wherein the motor is fixedly arranged at the bottom of the bracket, and an output shaft of the motor is coaxially arranged with the transmission shaft.

Description

Magnetic fluid dynamic sealing performance testing device Technical Field The invention relates to the technical field of dynamic sealing, in particular to a magnetic fluid dynamic sealing performance testing device. Background The magnetic liquid sealing device constrains the magnetic liquid by creating a strong magnetic field in a gap between the rotor and the stator, thereby preventing the flow of a sealing medium to realize sealing, having the characteristics of simple structure and zero leakage, and being an important part for realizing low-pressure operation and reducing air friction loss of a heavy-duty hypergravity centrifugal machine. In order to improve the service life and reduce the maintenance cost, the rotor of the heavy-duty hypergravity centrifugal machine needs to be supported by adopting a sliding bearing. The large rotating shaft of the heavy centrifuge inevitably has radial deflection and axial floating in the running process under the influence of the dynamic change of the oil film supporting rigidity of the sliding bearing, unbalanced force of the centrifuge and other factors. Under the high-speed running state, the radial deflection and the axial floating of the rotor can obviously influence the sealing performance and the stability of the dynamic sealing device. Therefore, before the whole machine is installed and debugged, the dynamic sealing performance of the large dynamic sealing device under specific radial runout and axial floating conditions needs to be evaluated and tested. Because the rotor is large in scale and heavy in mass, the traditional rotor test platform is difficult to reproduce the supporting environment and the load level in the actual application scene, and the sealing performance of the large-scale magnetic fluid sealing device cannot be accurately estimated. Disclosure of Invention The invention aims to provide a magnetic fluid dynamic sealing performance testing device, which is used for solving the problem of dynamic sealing performance testing of a large magnetic fluid sealing device under the combined working conditions of high-speed rotation, radial deflection and axial floating. The invention is realized by the following technical scheme: The invention provides a magnetic fluid dynamic sealing performance testing device which comprises a simulation shaft, a transmission shaft, a sealing shell and a vacuum cover, wherein the transmission shaft is vertically arranged on a bracket and can rotate around an axis through motor driving, the simulation shaft is sleeved at the upper end of the transmission shaft, the outer peripheral wall of the simulation shaft is eccentric relative to the transmission shaft, the sealing shell is fixedly connected on the bracket and surrounds the outer side of the simulation shaft, magnetic fluid is filled between the inner peripheral wall of the sealing shell and the outer peripheral wall of the simulation shaft, the lower end of the simulation shaft is connected with the transmission shaft through an axially telescopic sealing coupler, an actuator is arranged between the simulation shaft and the bracket so as to drive the simulation shaft to move up and down along the transmission shaft, and the vacuum cover is arranged on the bracket and covers the sealing shell so as to form a sealing monitoring cavity. As a further scheme of the invention, the simulation shaft comprises a sealing cylinder body, a balance cylinder body and a cylinder body seat, wherein the center of the cylinder body seat is provided with a through hole and sleeved on a transmission shaft, the sealing cylinder body and the balance cylinder body are sequentially sleeved on the cylinder body seat from outside to inside, the sealing cylinder body is eccentrically arranged relative to the cylinder body seat, and the balance cylinder body is reversely eccentrically arranged relative to the cylinder body seat. As a further scheme of the invention, the actuator comprises a permanent magnet ring and an excitation ring, wherein the permanent magnet ring is arranged on the analog shaft, the excitation ring is arranged on the bracket, and the excitation ring can drive the analog shaft to move up and down along the axial direction after being electrified. As a further scheme of the invention, the bracket comprises a base, a bearing seat and an excitation base, wherein the bearing seat is arranged on the base, a bearing is arranged in the bearing seat and used for axially and radially supporting a transmission shaft, and the excitation base is arranged at the upper end of the bearing seat and used for installing an excitation ring. As a further scheme of the invention, the transmission shaft comprises a connecting section, a bearing section, a sealing section and a sliding section which are sequentially arranged from bottom to top, wherein the connecting section is used for being connected with the output end of the motor, the bearing section is used for forming rotary co