Magnetic liquid sealing device adapted to axial and radial displacements of connection

Patent metadata

Field	Value
Publication number	US-11215286-B2
Application number	US-201816765206-A
Country	US
Kind code	B2
Filing date	Jul 4, 2018
Priority date	Jul 4, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

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.

First claim

What is claimed is:

1. A magnetic liquid sealing device adapted to axial and radial displacements of connection comprising:
an end cover;
a rubber-sealing-ring equipped first clamping plate fixed on the end cover by a first screw and a second screw, the rubber-sealing-ring equipped first clamping plate comprising a first rubber sealing ring, the first rubber sealing ring being mounted in a groove of the first clamping plate;
a rubber-sealing-ring equipped second clamping plate installed in a groove of the end cover, the rubber-sealing-ring equipped second clamping plate comprising a second rubber sealing ring and a third rubber sealing ring, the second rubber sealing ring and the third rubber sealing ring being mounted in a groove of the second clamping plate; and
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 first rubber-sealing-ring equipped clamping plate and the rubber-sealing-ring equipped second clamping plate.

2. The magnetic liquid sealing device adapted to axial and radial displacements of connection according to claim 1 , wherein the fundamental sealing structure further comprises:
a housing, a fourth rubber sealing ring and a fifth rubber sealing ring, each being mounted in a groove of the housing;
a seal-group equipped shaft sleeve installed in the housing, the seal-group equipped shaft sleeve comprising a right rolling bearing, a right magnetic isolating ring, a rubber-sealing-ring equipped right pole shoe, an annular permanent magnet, a rubber-sealing-ring equipped left pole shoe, a left magnetic isolating ring, a left rolling bearing and a shaft sleeve, the right rolling bearing, the right magnetic isolating ring, the rubber-sealing-ring equipped right pole shoe, the annular permanent magnet, the rubber-sealing-ring equipped left pole shoe, the left magnetic isolating ring and the left rolling bearing being successively fitted over an outside of the shaft sleeve;
a left end ring fitted over a first side of the outside of the seal-group equipped shaft sleeve and rotationally screwed into a thread of an inner wall of the housing; and
a right end ring fitted over a second side of the outside of the seal-group equipped shaft sleeve opposite the first side in an axial direction of the seal-group equipped shaft sleeve, a first set screw and a second set screw being screwed in the right end ring.

3. The magnetic liquid sealing device adapted to axial and radial displacements of connection according to claim 2 , wherein:
the rubber-sealing-ring equipped right pole shoe comprises a sixth rubber sealing ring, and the sixth rubber sealing ring is mounted in a groove of the right pole shoe; and
the rubber-sealing-ring equipped left pole shoe comprises a seventh rubber sealing ring, and the seventh rubber sealing ring is mounted in a groove of the left pole shoe.

4. The magnetic liquid sealing device adapted to axial and radial displacements of connection according to claim 3 , wherein both the left pole shoe and the right pole shoe are magnetic materials, inner walls of the left pole shoe and the right pole shoe comprise pole teeth and tooth slots, 2 to 10 pole teeth are provided for each pole shoe, a width of each pole tooth is at least 0.3 mm, and a width of each tooth slot is at least 0.5 mm.

5. The magnetic liquid sealing device adapted to axial and radial displacements of connection according to claim 2 , wherein a sealing gap between the rubber-sealing-ring equipped left pole shoe, the rubber-sealing-ring equipped right pole shoe and the shaft sleeve is 0.001 to 1 mm, and the sealing gap is filled with magnetic liquid to achieve dynamic sealing.

6. The magnetic liquid sealing device adapted to axial and radial displacements of connection according to claim 2 , wherein materials of the left magnetic isolating ring, the right magnetic isolating ring and the housing are non-magnetic materials.

Assignees

• Univ Tsinghua

Inventors

• Li Decai
• Chen Siyu
• Liu Xiao
• Li Qian
• Sun Rui
• Yang Jixian
• Li Zhenghao

Classifications

• F16J15/062

  characterised by the geometry of the seat · CPC title

• F16C33/765

  by a magnetic field · CPC title

• F16J15/002

  comprising at least two sealings in succession (F16J15/162, F16J15/40 take precedence) · CPC title

• F16J15/3276 Primary

  with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted · CPC title

• F16C19/546

  Systems with spaced apart rolling bearings including at least one angular contact bearing · CPC title