公开(公告)号：US20240145144A1

公开(公告)日：2024-05-02

申请号：US18496477

申请日：2023-10-27

Applicant: BEIJING JIAOTONG UNIVERSITY ,  TSINGHUA UNIVERSITY

Inventor： Decai LI ,  Zhibin WANG ,  Sijia LIU ,  Xinzhi HE

IPC: H01F7/20 ,  H01F1/44

CPC classification number: H01F7/20 ,  H01F1/44

Abstract: Provided is a device sealed with a magnetic liquid. The device includes: a rotary shaft, a tank body, a control unit, a first module, a second module, a magnetic liquid, and a pole-tooth. The first module and the second module are in the same configuration, each consists of an outer shell, a left pole-shoe, an electromagnet, a control wiring, a right pole-shoe, and a circlip. The device includes at least two modular structures; the control unit controls a first electromagnet and a second electromagnet to be magnetized to alternately bear a sealing role.

公开(公告)号：US20230030538A1

公开(公告)日：2023-02-02

申请号：US17568419

申请日：2022-01-04

Applicant: Tsinghua University ,  BEIJING JIAOTONG UNIVERSITY

Inventor： Decai LI ,  Xinzhi HE ,  Zhibin WANG ,  Sijia LIU

IPC: H02K5/10 ,  H01F1/44 ,  H01F7/02

Abstract: The present disclosure relates to a magnetic liquid sealing device. When a rotating shaft of the device axially vibrates, an outer ring of a bearing may not be provided with a rim, and a J-shaped bush and U-shaped sleeve ring can have relative displacement in an axial direction. When the rotating shaft radially vibrates, the U-shaped sleeve ring may deviate radially to allow sealing gaps, so as to prevent a bump between a pole shoe and J-shaped bush. Under action of a support spring and axial spring, sealing rings can be pressed to allow for sealing, and the U-shaped sleeve ring may not be in direct contact with an end cap, so as to avoid face friction.

公开(公告)号：US20240141998A1

公开(公告)日：2024-05-02

申请号：US18496534

申请日：2023-10-27

Applicant: BEIJING JIAOTONG UNIVERSITY ,  TSINGHUA UNIVERSITY

Inventor： Decai LI ,  Zhibin WANG ,  Sijia LIU ,  Xinzhi HE

IPC: F16J15/43

CPC classification number: F16J15/43

Abstract: Provided is a device sealed with a magnetic liquid. The device includes: a rotary shaft, a first bearing, a tank body, a first magnetism isolation ring, a first gasket ring, a first pole-shoe, a permanent magnet, a second pole-shoe, a second gasket ring, a second magnetism isolation ring, a second bearing, an end cover, a pole-tooth and a water delivery coating. The water delivery coating strips are coated on the an exterior circumferential surface of the rotary shaft at intervals, where each water delivery coating strip contains three parts with different water delivering directions individually.

公开(公告)号：US20240141999A1

公开(公告)日：2024-05-02

申请号：US18496575

申请日：2023-10-27

Applicant: BEIJING JIAOTONG UNIVERSITY ,  TSINGHUA UNIVERSITY

Inventor： Decai LI ,  Zhibin WANG ,  Xinzhi HE ,  Zulong YANG

IPC: F16J15/43

CPC classification number: F16J15/43

Abstract: Provided is a self-cooling device sealed with a magnetic liquid, related to the field of mechanical engineering sealing technology. The device includes: a tank body, a pole-tooth, a rotary shaft, a magnetic liquid, a first gasket ring, a second gasket ring, a first pole-shoe, a permanent magnet, a third gasket ring, a second pole-shoe, a fourth gasket ring, a fan, a bolt, an end cover, a second U-shape soaking rod, and a first U-shape soaking rod.

公开(公告)号：US20210246986A1

公开(公告)日：2021-08-12

申请号：US17257535

申请日：2018-07-16

Applicant: TSINGHUA UNIVERSITY

Inventor： Weifeng HUANG ,  Xiangfeng LIU ,  Yuan YIN ,  Ying LIU ,  Decai LI ,  Yongjian LI ,  Shuangfu SUO ,  Zixi WANG ,  Xiaohong JIA ,  Fei GUO

IPC: F16J15/34 ,  G01M13/005

Abstract: An intelligent regulation system for a mechanical seal, the system comprising: a monitoring device for measuring a signal correlated with a seal in real time; a control device, comprising a state determination module, a feasible region analysis module, an evaluation module and an optimizing module, wherein the state determination module unscrambles the signal obtained by the monitoring device to estimate the state of the seal; the feasible region analysis module determines, according to a current state, a state that the seal can reach by means of the regulating effect of a regulating device; the evaluation module evaluates a value for the state of the seal; and the optimizing module searches a feasible region, where the seal is regulated, for a regulating method with a relatively high value to the greatest extent, and accordingly sends an instruction to the regulating device; and the regulating device for actively applying an action to the seal according to the instruction given by the control device.

公开(公告)号：US20220205542A1

公开(公告)日：2022-06-30

申请号：US17313391

申请日：2021-05-06

Applicant: Tsinghua University

Inventor： Decai LI ,  Yingsong LI ,  Xiao LIU ,  Sijie REN ,  Pengdong HAN

IPC: F16J15/43

Abstract: A magnetic liquid sealing device includes a housing, a rotating shaft, a first pole shoe, a second pole shoe, a plurality of permanent magnets, a rotation ring, and a sealing block. A chamber is defined in the housing including a first housing and a second housing. The rotating shaft passes through and is rotatable. The first pole shoe and the second pole shoe surround the rotating shaft and are spaced apart. The plurality of permanent magnets between the first pole shoe and the second pole shoe are spaced apart. The rotation ring surrounds the rotating shaft and is rotatable. The first housing, the rotation ring, and the second housing define the chamber. The rotation ring on outer sides of the plurality of permanent magnets is defined with a through hole running through the rotation ring. The sealing block in the through hole is detachably connected to the rotation ring.

公开(公告)号：US20220074499A1

公开(公告)日：2022-03-10

申请号：US17467855

申请日：2021-09-07

Applicant: Tsinghua University

Inventor： Decai LI ,  Rui SUN ,  Qian LI

IPC: F16J15/43

Abstract: A capillary magnetic-liquid sealing device includes: a housing having a shaft chamber; a rotating shaft arranged in the shaft chamber; a first pole shoe and a second pole shoe fitted over the rotating shaft and spaced apart in an axial direction of the rotating shaft; a permanent magnet fitted over the rotating shaft and located between the first pole shoe and the second pole shoe; a first magnetically nonconductive capillary block and a second magnetically nonconductive capillary block fitted over the rotating shaft and spaced apart in the axial direction of the rotating shaft. A first capillary cavity is formed among the first magnetically nonconductive capillary block, the first pole shoe and the rotating shaft; and a second capillary cavity is formed among the second magnetically nonconductive capillary block, the second pole shoe and the rotating shaft.

公开(公告)号：US20200278031A1

公开(公告)日：2020-09-03

申请号：US16765206

申请日：2018-07-04

Applicant: Tsinghua University

Inventor： Decai LI ,  Siyu CHEN ,  Xiao LIU ,  Qian LI ,  Rui SUN ,  Jixian YANG ,  Zhenghao LI

IPC: F16J15/43 ,  F16C33/82 ,  F16C27/04 ,  F16J15/34

Abstract: The present disclosure discloses a magnetic liquid sealing device adapted to axial and radial displacements of connection, which includes: an end cover; a rubber-sealing-ring equipped first clamping plate fixed on the end cover by a first screw and a second screw; a rubber-sealing-ring equipped second clamping plate installed in a groove of the end cover; a fundamental sealing structure fixed on the rubber-sealing-ring equipped second clamping plate by a third screw and a fourth screw, so as to be isolated from the end cover by the rubber-sealing-ring equipped first clamping plate and the rubber-sealing-ring equipped second clamping plate. The device isolates the connected component from the magnetic liquid sealing structure by the two clamping plates, such that the axial and radial deformations and displacements of the connected component will not be loaded on parts in magnetic liquid sealing structure, prolonging the service life of the magnetic liquid sealing.

公开(公告)号：US20220128123A1

公开(公告)日：2022-04-28

申请号：US17507520

申请日：2021-10-21

Applicant: Tsinghua University

Inventor： Decai LI ,  Yanwen LI ,  Siyu CHEN

IPC: F16G13/06 ,  F16G15/12 ,  F16J15/43

Abstract: A chain unit lubricated and sealed with magnetic fluid includes a pin shaft, a magnetic sleeve, a first pole piece and a second pole piece. The sleeve is fitted over an outer periphery of the pin shaft. Both ends of the pin shaft protrude from the sleeve. A first gap exists between an inner peripheral surface of the sleeve and an outer peripheral surface of the pin shaft. The first pole piece is arranged at one of the sleeve and has a first mating hole. A second gap exists between an inner wall surface of the first mating hole and the outer peripheral surface of the pin shaft. The second pole piece is arranged at the other end of the sleeve and has a second mating hole. A third gap exists between an inner wall surface of the second mating hole and the outer peripheral surface of the pin shaft.

公开(公告)号：US20210123530A1

公开(公告)日：2021-04-29

申请号：US16764627

申请日：2019-01-24

Applicant: Tsinghua University

Inventor： Decai LI ,  Jixian YANG ,  Siyu CHEN ,  Qian LI ,  Rui SUN ,  Xiao LIU ,  Zhenghao LI

IPC: F16J15/43 ,  F16C33/76

Abstract: A magnetic liquid sealing device (100) with a heat conductive rod and a heat dissipating jacket includes: a shaft casing (1), a rotating shaft (2), two bearings (3), two pole shoes (4), a permanent magnet (5), a heat conductive rod (6) and a heat dissipating jacket (7). The rotating shaft (2) is rotatably arranged in the shaft casing (1), two bearings (3) and two pole shoes (4) are fitted over the rotating shaft (2), and the two pole shoes (4) are located between the two bearings (3). The permanent magnet (5) is fitted over the rotating shaft (2) and is located between the two pole shoes (4). The heat conductive rod (6) is inserted in the pole shoe (4), the heat dissipating jacket (7) is fitted over the shaft casing (2), and the heat conductive rod (6) is connected with the heat dissipating jacket (7) through a connecting member (11).