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CN-224214701-U - Magnetic fluid sealing structure of long shaft rod

CN224214701UCN 224214701 UCN224214701 UCN 224214701UCN-224214701-U

Abstract

The utility model discloses a magnetic fluid sealing structure of a long shaft rod heavy-load hollow shaft, which comprises a structural body, wherein the structural body comprises a shell, a shaft, a cover plate, a first magnetism isolating ring, magnetic poles, a magnetic conduction shaft sleeve, a second magnetism isolating ring, a rear bearing, a magnetic liquid groove, a magnet, a magnetic pole sealing groove, a shaft clamp and a front bearing are arranged in the shell, the magnetic conduction shaft sleeve is sleeved in one side of the front bearing, the shaft clamp is positioned at the other side of the magnetic conduction shaft sleeve, a shaft sealing groove is arranged between the magnetic conduction shaft sleeve and the shaft, so that static sealing is achieved, one side of an outer ring of the front bearing is tightly propped against the cover plate, the first magnetism isolating ring, two magnetic poles, the magnet, the second magnetism isolating ring and the rear bearing are sequentially arranged on the other side of the outer ring of the front bearing, the coaxiality of the shaft and a sealing assembly is ensured during installation, leakage caused by eccentricity is avoided, magnetic grease is injected, and the magnetic liquid is firmly adsorbed between a magnetic pole inner hole and a gap of the shaft, so that sealing is achieved.

Inventors

  • YIN LI

Assignees

  • 上海伊灿真空技术有限公司

Dates

Publication Date
20260508
Application Date
20250722

Claims (8)

  1. 1. A magnetic fluid sealing structure of a long shaft rod is characterized by comprising a structural body, wherein the structural body comprises a shell (102), a shaft (101) is arranged in the shell (102), a front bearing (10) is arranged on one side of the shaft (101), a cover plate (107) is arranged on one side of the front bearing (10) and tightly presses an outer ring of the shaft (101), an inner ring of the shaft (101) is positioned by using one shaft clamp, a magnetic conduction shaft sleeve (105) is arranged on the inner ring of the other side of the shaft, a shaft sealing groove (9) is arranged between the shaft (101) and the magnetic conduction shaft sleeve (105) and is positioned by the other shaft clamp, a magnetic liquid groove (6) is formed in the magnetic conduction shaft sleeve (105), magnetic liquid is arranged in the magnetic liquid groove (6), and a first magnetism isolating ring (106), a magnetic pole (104), a magnet (7), a second magnetism isolating ring (103) and a rear bearing (2) are sequentially arranged on the outer ring of the magnetic conduction shaft sleeve (105).
  2. 2. The magnetic fluid sealing structure of the long shaft rod according to claim 1, wherein the shell (102) further comprises a flange sealing groove (4), a flange hole (14) and a blocking groove (3), the flange sealing groove (4) is arranged on one side of the outside of the shell (102), the flange hole (14) is arranged on the outer ring of the shell (102), and the blocking groove (3) corresponds to the structure of the external power equipment on the other side of the flange.
  3. 3. The magnetic fluid sealing structure of the long shaft rod according to claim 1, wherein two magnetic poles (104) are distributed on two sides of the magnet (7), a certain gap is reserved between the magnetic poles and the shaft, and the magnetic poles and the shaft are supported by a front bearing (10) and a rear bearing (2) on two sides.
  4. 4. The magnetic fluid sealing structure of the long shaft rod according to claim 1, wherein a first magnetism isolating ring (106) and a second magnetism isolating ring (103) are respectively arranged on two sides of the magnetic pole (104).
  5. 5. The magnetic fluid sealing structure of the long shaft rod according to claim 1, wherein a magnetic pole sealing groove (8) is arranged outside the magnetic pole (104), and a sealing ring is arranged in the magnetic pole sealing groove (8) and used for static sealing between the magnetic pole (104) and the shell (102).
  6. 6. The magnetic fluid sealing structure of the long shaft rod according to claim 1, wherein the magnet (7) is one of a button-shaped structure or a ring-shaped structure.
  7. 7. A long shaft magnetic fluid sealing structure according to claim 1, characterized in that the shaft (101) is an ultra long shaft, heat treatment is required to increase rigidity, and a support bearing (11) is installed at the ultra long part of the shaft at the equipment.
  8. 8. The magnetic fluid sealing structure of the long shaft rod according to claim 1, wherein a first key groove (1) and a second key groove (12) are arranged at two ends of the shaft (101), and a shaft clamping groove (13) is arranged at one end, far away from the shell (102), of the second key groove (12).

Description

Magnetic fluid sealing structure of long shaft rod Technical Field The utility model relates to the technical field of magnetic fluid sealing, in particular to a magnetic fluid sealing structure of a long shaft rod. Background In recent years, vacuum equipment has been developed rapidly at home and abroad. Magnetic fluid sealing is widely applied to a plurality of rotary dynamic sealing devices, such as sealing of vacuum equipment such as monocrystalline silicon furnaces, vacuum brazing furnaces, vacuum smelting furnaces, chemical vapor deposition, ion plating, liquid crystal regeneration and the like, and sealing of high-temperature high-pressure equipment and equipment with high environmental requirements. Thereby improving the product quality and obtaining good economic benefit. The magnetic fluid sealing technology is developed on the basis of magnetic fluid, and when the magnetic fluid is injected into the gap of the magnetic field, the magnetic fluid can fill the whole gap to form a 'liquid O-shaped sealing ring'. The magnetic fluid sealing device functions to transfer rotational motion into a sealed container, commonly used for vacuum sealing. In the current magnetic fluid technology application process, the sealing failure is caused by the contact between the outer surface of the magnetic conduction shaft or the magnetic conduction sleeve and the inner surface of the sealing component, the phenomenon is easy to occur in a structure without a bearing in the magnetic fluid sealing component, the phenomenon is generally caused by the fact that the coaxiality of the rotating shaft and the sealing component is not aligned to cause eccentricity when the magnetic fluid sealing component is installed, the eccentric phenomenon is caused to generate contact, the problem is solved after the bearing with certain precision is installed, and due to the fact that equipment is developed gradually and slowly, the internal performance of the magnetic fluid is required to be increased, for example, various dimensional structure requirements are required when the magnetic fluid runs, long shaft rods are required to penetrate into the equipment, and a long shaft rod magnetic fluid sealing structure is designed to solve the problem. Disclosure of Invention The utility model aims to solve the defects in the prior art and provides a magnetic fluid sealing structure of a long shaft rod. In order to achieve the above purpose, the present utility model adopts the following technical scheme: A magnetic fluid sealing structure of a long shaft rod comprises a structural body, wherein the structural body comprises a shell, a shaft is arranged in the shell, a front bearing is arranged on one side of the shaft, a cover plate is arranged on one side of the front bearing and is pressed on an outer ring of the shaft, an inner ring of the shaft is positioned by using one shaft clamp, a magnetic conduction shaft sleeve is arranged on the inner ring of the other side of the shaft and is positioned by the other shaft clamp, a shaft sealing groove is arranged between the shaft and the magnetic conduction shaft sleeve, a magnetic liquid groove is formed in the magnetic conduction shaft sleeve, a magnetic liquid is arranged in the magnetic liquid groove, and a first magnetism isolating ring, a magnetic pole, a magnet, a second magnetism isolating ring and a rear bearing are sequentially arranged on the outer ring of the magnetic conduction shaft sleeve. Preferably, the shell further comprises a flange sealing groove, a flange hole and a blocking groove, wherein the flange sealing groove is arranged on one side of the outer portion of the shell, the flange hole is arranged on the outer ring of the shell, and the blocking groove corresponds to an external power equipment structure on the other side of the flange. Preferably, two magnetic poles are distributed on two sides of the magnet, a certain gap is reserved between the magnetic poles and the shaft, and the magnetic poles and the shaft are supported by front bearings and rear bearings on two sides. Preferably, the two sides of the magnetic pole are respectively provided with a first magnetism isolating ring and a second magnetism isolating ring. Preferably, a magnetic pole sealing groove is arranged outside the magnetic pole, and a sealing ring is arranged in the magnetic pole sealing groove and is used for static sealing between the magnetic pole and the shell. Preferably, the magnet is one of a button-shaped structure or a ring-shaped structure. Preferably, the shaft is an ultra-long shaft, heat treatment is required to increase rigidity, and a bracket bearing is installed at the ultra-long part of the shaft at the equipment. Preferably, the two ends of the shaft are provided with a first key groove and a second key groove, and one end, far away from the shell, of the second key groove is provided with a shaft clamping groove. Compared with the related art, the magnetic fluid sealing str