CN-120027214-B - Micro-nano magnetic medium sealing device with end face diversion trench

CN120027214BCN 120027214 BCN120027214 BCN 120027214BCN-120027214-B

Abstract

The invention discloses a micro-nano magnetic medium sealing device with an end face diversion trench, which comprises a shell, a rotating shaft and a micro-nano magnetic medium sealing assembly, wherein the micro-nano magnetic medium sealing assembly comprises a magnetic conduction shaft sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet, a sealing gap for filling the micro-nano magnetic medium is arranged between the low-pressure side pole shoe and a first pole tooth, between the high-pressure side pole shoe and a second pole tooth, and at least one of the low-pressure side pole shoe and the high-pressure side pole shoe is provided with the diversion trench, and when the magnetic conduction shaft sleeve rotates, the diversion trench is used for providing a acting force opposite to the pressure difference direction for the micro-nano magnetic medium. The micro-nano magnetic medium can flow along the diversion trench in the rotating process, and the micro-nano magnetic medium deflection caused by pressure difference and centrifugal force is partially counteracted, so that the condition of loss of the micro-nano magnetic medium caused by the centrifugal force is reduced, the sealing performance is improved, and the higher sealing medium pressure requirement is met.

Inventors

LI DECAI
Diao Zeyuan
YU RUNZE

Assignees

清华大学

Dates

Publication Date: 20260512
Application Date: 20250124

Claims (8)

1. A micro-nano magnetic medium sealing device with an end surface diversion trench, which is characterized by comprising: a housing defining a chamber; a rotating shaft, at least a portion of which is rotatably disposed within the chamber; The micro-nano magnetic medium sealing assembly is arranged in the cavity and comprises a magnetic conduction shaft sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet, wherein the magnetic conduction shaft sleeve is sleeved on the rotating shaft, the magnetic conduction shaft sleeve is provided with a first end face and a second end face which are opposite along the axial direction of the magnetic conduction shaft sleeve, a first pole tooth is arranged on the first end face, a second pole tooth is arranged on the second end face, the low-pressure side pole shoe and the high-pressure side pole shoe are sleeved on the rotating shaft and are arranged on two sides of the magnetic conduction shaft sleeve at intervals along the axial direction of the rotating shaft, a sealing gap for filling micro-nano magnetic medium is formed between the low-pressure side pole shoe and the first pole tooth, between the high-pressure side pole shoe and the second pole tooth, the magnet is arranged between the low-pressure side pole shoe and the high-pressure side pole shoe and is positioned on the outer side of the magnetic conduction shaft sleeve, the magnet and the magnetic conduction shaft sleeve are arranged at intervals, the end face adjacent to the first pole tooth and the high-pressure side pole shoe are arranged on the magnetic conduction groove adjacent to the first pole tooth, and the magnetic conduction groove is arranged on at least one of the magnetic conduction groove adjacent to the first pole shoe, and the magnetic medium is used for providing a magnetic differential pressure opposite to the rotating direction when the micro-nano magnetic medium is provided; The guide grooves on the low-pressure side pole shoe extend obliquely from inside to outside and in the direction opposite to the rotation direction of the rotating shaft, the guide grooves on the high-pressure side pole shoe extend obliquely from inside to outside and in the same direction as the rotation direction of the rotating shaft, the number of the guide grooves is multiple, and the guide grooves are arranged at intervals along the circumference of the low-pressure side pole shoe.
2. The micro-nano magnetic medium sealing device with the end face diversion trenches according to claim 1, wherein the distance between two adjacent diversion trenches gradually increases from inside to outside.
3. The micro-nano magnetic medium sealing device with the end surface diversion trench of claim 1, wherein the diversion trench is an arc trench.
4. The micro-nano magnetic medium sealing device with the end surface diversion trench of claim 1, wherein the diversion trench is a linear trench.
5. The micro-nano magnetic media sealing device with an end face diversion trench of claim 1, wherein the diversion trench is a curved trench.
6. The micro-nano magnetic media sealing device with end face flow guiding grooves according to claim 1, wherein the depth of the flow guiding grooves is H, the size of the sealing gap is B, wherein H < B.
7. The micro-nano magnetic medium sealing device with the end surface diversion trench of claim 6, wherein B is more than or equal to 0.1mm and less than or equal to 1mm.
8. The micro-nano magnetic medium sealing device with the end face diversion trenches of claim 1, wherein the micro-nano magnetic medium sealing assembly is provided with a plurality of micro-nano magnetic medium sealing assemblies, the micro-nano magnetic medium sealing assemblies are arranged in the cavity along the axial direction of the rotating shaft at intervals, a rotating shaft sleeve is arranged between two adjacent magnetic conduction shaft sleeves, the rotating shaft sleeve is sleeved on the rotating shaft, and two ends of the rotating shaft sleeve are respectively stopped on the two rotating shaft sleeves.

Description

Micro-nano magnetic medium sealing device with end face diversion trench Technical Field The invention relates to the technical field of micro-nano magnetic medium sealing, in particular to a micro-nano magnetic medium sealing device with an end surface diversion trench. Background In the micro-nano magnetic medium sealing technology, the micro-nano magnetic medium forms an O-shaped ring under the action of an uneven magnetic field, so that the sealing of the medium is realized, and the micro-nano magnetic medium sealing technology has the remarkable advantages of zero leakage, long service life, low friction and the like, and therefore plays an irreplaceable role in high-end equipment such as aerospace, nuclear energy and the like. In the related art, the micro-nano magnetic medium seal needs to bear certain pressure, and under the working condition of high rotating speed, the micro-nano magnetic medium is acted by centrifugal force besides the pressure difference on the two sides of the pole shoe. When the micro-nano magnetic medium is thrown out of the sealing gap under the action of centrifugal force, the micro-nano magnetic medium can flow in a shifting way towards the pole shoe direction at the low pressure side under the action of pressure difference, so that the requirement of high sealing medium pressure cannot be met. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a micro-nano magnetic medium sealing device with an end surface diversion trench. The micro-nano magnetic medium sealing device with the end face diversion trenches comprises a shell, a rotating shaft and a micro-nano magnetic medium sealing assembly, wherein the shell defines a cavity, at least one part of the rotating shaft is rotatably arranged in the cavity, the micro-nano magnetic medium sealing assembly is arranged in the cavity and comprises a magnetic conduction shaft sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet, the magnetic conduction shaft sleeve is sleeved on the rotating shaft, the magnetic conduction shaft sleeve is provided with a first end face and a second end face which are opposite along the axial direction of the magnetic conduction shaft sleeve, a first pole tooth is arranged on the first end face, a second pole tooth is arranged on the second end face, the low-pressure side pole shoe and the high-pressure side pole shoe are sleeved on the rotating shaft and are arranged on two sides of the magnetic conduction shaft sleeve along the axial direction of the rotating shaft at intervals, a sealing gap for filling micro-nano magnetic medium is formed between the low-pressure side pole shoe and the second pole shoe, the magnet is arranged between the low-pressure side pole shoe and the high-pressure side pole shoe and the magnet, when the magnetic conduction shaft sleeve is arranged on the magnetic conduction shaft sleeve and the magnetic conduction shaft sleeve is provided with a magnetic conduction trench, and the magnetic medium is provided with a pressure difference between the magnetic conduction shaft sleeve and the high-pressure side and the magnetic conduction device. In some embodiments, the guide grooves on the low-pressure side pole shoe extend obliquely from inside to outside and in the direction opposite to the rotation direction of the rotating shaft, and the guide grooves on the high-pressure side pole shoe extend obliquely from inside to outside and in the same direction as the rotation direction of the rotating shaft. In some embodiments, the number of the diversion trenches is a plurality, and the diversion trenches are arranged at intervals along the circumference of the low-pressure side pole shoe. In some embodiments, the distance between two adjacent diversion trenches gradually increases from inside to outside. In some embodiments, the flow guide groove is a circular arc groove. In some embodiments, the flow guide groove is a linear groove. In some embodiments, the flow guide groove is a curved groove. In some embodiments, the depth of the flow guide groove is H, and the size of the sealing gap is B, where H < B. In some embodiments, 0.1 mm≤B≤1 mm. In some embodiments, the micro-nano magnetic medium sealing assemblies are multiple, the micro-nano magnetic medium sealing assemblies are arranged in the cavity along the axial direction of the rotating shaft at intervals, rotating shaft sleeves are arranged between two adjacent magnetic conduction shaft sleeves, the rotating shaft sleeves are sleeved on the rotating shaft, and two ends of the rotating shaft sleeves are respectively stopped on the two rotating shaft sleeves. According to the micro-nano magnetic medium sealing device with the end surface diversion trench, the diversion trench is designed, so that the micro-nano magnetic medium is not easy to throw out of a sealing g