Self-cooling device sealed with magnetic liquid

Patent metadata

Field	Value
Publication number	US-12287035-B2
Application number	US-202318496575-A
Country	US
Kind code	B2
Filing date	Oct 27, 2023
Priority date	Oct 31, 2022
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

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.

First claim

What is claimed is:

1. A self-cooling device sealed with a magnetic liquid, the device comprising: a tank body, a pole-tooth, a rotary shaft, the 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,
wherein the first gasket ring and the second gasket ring are respectively installed in two circular grooves located at an exterior circumferential surface of the first pole-shoe, and the third gasket ring and the fourth gasket ring are respectively installed in two circular grooves located at an exterior circumferential surface of the second pole-shoe;
the first pole-shoe is provided with a first blind hole arranged in a radial direction between the two circular grooves at the exterior circumferential surface of the first pole-shoe;
the second pole-shoe is provided with a second blind hole arranged in the radial direction between the two circular grooves at the exterior circumferential surface of the second pole-shoe;
the first pole-shoe and the second pole-shoe each are provided with a plurality of pole-teeth at respective interior circumferential surfaces;
the rotary shaft has a first end and a second end in an axial direction, wherein the fan is installed at the second end of the rotary shaft through the bolt;
the first pole-shoe, the permanent magnet, and the second pole-shoe are arranged at a radial side of the rotary shaft and installed in sequence in the axial direction from the first end to the second end of the rotary shaft inside the tank body;
the magnetic liquid is filled in a space to be sealed between a circumferential surface of the rotary shaft and the interior circumferential surfaces of the first pole-shoe and the second pole-shoe at the plurality of pole-teeth;
the end cover is installed in the tank body via threaded connection, such that the first pole-shoe, the permanent magnet, and the second pole-shoe are pressed against the tank body by screwing the end cover;
the tank body is provided with a first through hole and a second through hole, which are arranged at a circumferential wall of the tank body and correspond to the first blind hole at the first pole-shoe and the second blind hole at the second pole-shoe respectively;
an end of the first U-shape soaking rod stretches into the first blind hole at the first pole-shoe through the first through hole at the circumferential wall of the tank body, serving as a first heat end;
an end of the second U-shape soaking rod stretches into the second blind hole at the second pole-shoe through the second through hole at the circumferential wall of the tank body, serving as a second heat end;
the first heat end of the first U-shape soaking rod is of a diameter less than that of the first through hole at the circumferential wall of the tank body, and the second heat end of the second U-shape soaking rod is of a diameter less than that of the second through hole at the circumferential wall of the tank body; and
the first heat end of the first U-shape soaking rod and the second heat end of the second U-shape soaking rod are installed in the first blind hole at the first pole-shoe and the second blind hole at the second pole-shoe via interference fitting, respectively; and another end of the first U-shape soaking rod and another end of the second U-shape soaking rod, serving as a first cold end and a second cold end respectively, are arranged at where the fan blows.

2. The self-cooling device sealed with the magnetic liquid according to claim 1 , wherein the first pole-shoe, the second pole-shoe, and the rotary shaft each are made of a permeability magnetic material; the tank body is made of a non-permeability magnetic material; and the permanent magnet is of an axial magnetization direction.

3. The self-cooling device sealed with the magnetic liquid according to claim 1 , wherein:
the fan is arranged to blow toward the first cold end and the second cold end;
during rotation of the rotary shaft, the magnetic liquid filled in the space generates heat due to being subject to shear, wherein a part of heat for the first pole-shoe is transferred from the first heat end to the first cold end of the first U-shape soaking rod; while a part of heat for the second pole-shoe is transferred from the second heat end to the second cold end of the second U-shape soaking rod;
the fan rotating synchronously with the rotary shaft blows toward the first cold end and the second cold end, thereby taking the heat away from the first cold end of the first U-shape soaking rod and the second cold end of the second U-shape soaking rod; and
the higher rotation speed of the rotary shaft is, the more heat is generated from the magnetic liquid, the more heat is transferred to the first cold end of the first U-shape soaking rod and the second cold end of the second U-shape soaking rod, and the higher rotation speed of the fan is at the same time, the greater air quantity is generated, and the more heat is taken away, thereby reducing the increasing temperature for the device.

Assignees

• Univ Beijing Jiaotong
• Univ Tsinghua

Inventors

• Li Decai
• Wang Zhibin
• He Xinzhi
• Yang Zulong

Classifications

• F16J15/162

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

• F16J15/43 Primary

  kept in sealing position by magnetic force · CPC title