Magnetic liquid sealing device having heat conductive rod and heat dissipating jacket

Patent metadata

Field	Value
Publication number	US-11174947-B2
Application number	US-201916764627-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Jan 24, 2019
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

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).

First claim

The invention claimed is:

1. A magnetic liquid sealing device having a heat conductive rod and a heat dissipating jacket, comprising:
a shaft casing defining a shaft chamber therein;
a rotating shaft rotatably provided in the shaft chamber, and extending from one end of the shaft chamber to the other end of the shaft chamber;
two bearings individually fitted over the rotating shaft;
two pole shoes individually fitted over the rotating shaft and located between the two bearings, magnetic liquid being absorbed between an inner peripheral surface of each pole shoe and an outer peripheral surface of the rotating shaft, and an outer peripheral surface of each pole shoe having a blind hole extending along a radial direction of the pole shoe; and
a permanent magnet fitted over the rotating shaft and located between the two pole shoes;
wherein the heat conductive rod is inserted in the blind hole; and
wherein the heat dissipating jacket is fitted over the shaft casing and connected with the heat conductive rod through a connecting member.

2. The magnetic liquid sealing device according to claim 1 , wherein a plurality of blind holes are provided on each pole shoe and distributed evenly along a circumferential direction.

3. The magnetic liquid sealing device according to claim 2 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

4. The magnetic liquid sealing device according to claim 1 , wherein each of the two pole shoes is provided with a convex rim on a side away from the other pole shoe, the convex rim abutting against an outer circle of the bearing, and each of the two pole shoes abuts against an end surface of the permanent magnet on a side facing the other pole shoe.

5. The magnetic liquid sealing device according to claim 4 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

6. The magnetic liquid sealing device according to claim 1 , further comprising: a pair of sealing rings provided between each pole shoe and the shaft casing, the heat conductive rod being located between the sealing rings arranged in pairs.

7. The magnetic liquid sealing device according to claim 6 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

8. The magnetic liquid sealing device according to claim 1 , wherein one end of the shaft casing is formed with a first protrusion, one of the bearings abuts against the first protrusion, the other end of the shaft casing is connected with a flange, and the flange has a second protrusion extending into the shaft chamber.

9. The magnetic liquid sealing device according to claim 8 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

10. The magnetic liquid sealing device according to claim 8 , further comprising: a sleeve fitted over the rotating shaft and located between the second protrusion and the other bearing.

11. The magnetic liquid sealing device according to claim 10 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

12. The magnetic liquid sealing device according to claim 8 , further comprising: an adjusting washer sandwiched among the shaft casing, the heat dissipating jacket and the flange.

13. The magnetic liquid sealing device according to claim 12 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

14. The magnetic liquid sealing device according to claim 1 , wherein the heat dissipating jacket is made of one material of red copper and heat conducting graphite.

15. The magnetic liquid sealing device according to claim 14 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

16. The magnetic liquid sealing device according to claim 1 , wherein the thickness of the heat dissipating jacket ranges from 2 mm to 10 mm.

17. The magnetic liquid sealing device according to claim 16 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

18. The magnetic liquid sealing device according to claim 1 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.

Assignees

• Univ Tsinghua

Inventors

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

Classifications

• F16J15/162 Primary

  Special parts or details relating to lubrication or cooling of the sealing itself (F16J15/324, F16J15/3404, F16J15/40 take precedence) · CPC title

• F16C33/1035

  by a magnetic field acting on a magnetic liquid · CPC title

• F16C33/765

  by a magnetic field · CPC title

• F16J15/43 Primary

  kept in sealing position by magnetic force · CPC title

• F16C33/746

  by a magnetic field · CPC title