Rotary sealing device for magnetic liquid

Abstract

The invention relates to a rotary sealing device for a magnetic liquid, belonging to the field of mechanical engineering sealing. By means of the rotary sealing device, the problem that rainy water and dust can enter a right bearing along an end cover to produce rust on a sealing element to influence sealing performance of the traditional sealing device at the atmospheric environment under the condition of horizontal installation is solved. The device is characterized in that a left rolling bearing, a first non-magnetic ring, a left pole shoe with a rubber seal ring, a permanent magnet, a right pole shoe with a rubber seal ring, a second non-magnetic ring and a right rolling bearing abuts against the right side face of an inner bore boss of an outer shell in sequence and connected with threads on the outer shell through screws, and an end cover is fixed on the outer shell; the magnetic liquid is injected; a shaft sleeve for installing an adjusting spacer is loaded into an inner bore of the ; and a retainer ring is clung to the left end face of the shaft sleeve, and the retainer ring and the shaft sleeve are axially fixed by using the screws. A labyrinth spiral sealing groove is arranged on an inner bore of the end cover, and the clearance between the labyrinth spiral sealing groove and the shaft sleeve is 0.4 mm; and the distance L between the right end face of the end cover and the right end face of the shaft sleeve equals to 3.5-5 mm. The device has the advantages of simpleness in assembly, dust prevention, water prevention and long service life.

Description

technical field [0001] The invention belongs to the field of mechanical engineering sealing. Background technique [0002] Magnetic liquid sealing technology has been gradually used by more and more industries due to its advantages of zero leakage, no wear, long life, easy maintenance and simple structure. Produced by Beijing Jiaotong University, it is used for the magnetic liquid rotary sealing device on the rotary joint. The connection between each part is as follows: insert the first rubber sealing ring into the concave groove on the outer circumference of the left pole shoe to form a rubber seal The left pole piece of the ring, the second rubber ring is embedded in the concave groove on the outer circumference of the right pole piece to form the right pole piece with a rubber sealing ring. Put the left rolling bearing, the first magnetic isolation ring, the left pole piece with rubber sealing ring, the permanent magnet, the right pole piece with rubber sealing ring, the...

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Problems solved by technology

[0003] The technical problem to be solved in the present invention is that when the existing magnetic liquid rotary sealing device is used in an atmospheric environment and installed horizontally, rainwater and dust will enter the device, which will reduce the service life of the right bearing and affect the sealing performance

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