Method for improving magnetic liquid sealing reliability

Abstract

The invention provides a method for improving magnetic liquid sealing reliability, and belongs to the field of mechanical engineering sealing. The method comprises the following steps that a left pole shoe (8), a left sealing ring (9), a magnet (10), a right pole shoe (14), a right sealing ring (15) and a shaft sleeve (1) sequentially form a magnetic liquid sealing assembly; the left sealing ring (9), the right sealing ring (15) and a labyrinth sealing ring (11) sleeve an inner ring of the magnet (10) and realize the labyrinth sealing with the shaft sleeve (1), a positioning ring (5), a left bearing (6), a left magnetic separation ring (7), the magnetic liquid sealing assembly, a right magnetic separation ring (16) and a right bearing (17) are sequentially arranged in an outer sleeve (2), then, magnetic liquid (21) is injected onto the labyrinth sealing ring (11) sleeving the inner ring of the magnet (18), then, the shaft sleeve (1) is arranged in an inner hole of a part, an end cover (20) is fixedly arranged on the outer sleeve (2) through screws (18), in addition, the outer ring of the right bearing (17) is rightly pressed, and a screw (19) is used for connecting the end cover (20) and the shaft sleeve (1). The method has the advantages that the axial length for the sealing is not increased, the structure is simple, and the magnetic liquid sealing impact-resistant capability is improved, so the magnetic liquid sealing can be used in the toxic and harmful gas medium environment with great pressure fluctuation, and the magnetic liquid sealing use reliability is improved.

Description

technical field [0001] The invention relates to a method for improving the reliability of magnetic liquid sealing, belongs to the field of mechanical sealing, and is especially suitable for gas sealing of toxic and harmful gas medium with large pressure fluctuation of sealing medium. Background technique [0002] At present, most of the seals used on blowers are traditional seals such as labyrinth seals, but labyrinth seals have the problem of large leakage, and labyrinth seals are not suitable when the sealing medium is flammable and explosive gas. The magnetic liquid seal has the advantages of simple structure, zero leakage and long life, but the magnetic liquid sealing device described in Document 1 (Patent Publication No. CN 101799075A) has no impact resistance. When the limit pressure of the magnetic liquid seal is exceeded, the magnetic liquid seal will fail, and the sealing medium will leak in large quantities, which will cause great harm to the human body and the env...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the seals used on blowers are traditional seals such as labyrinth seals, but labyrinth seals have the problem of large leakage, and labyrinth seals should not be used when the sealing medium is flammable and explosive gases.

The magnetic liquid seal has the advantages of simple structure, zero leakage, and long life. However, the magnetic liquid seal device described in Document 1 (the patent with the publication number of CN 101799075A) has no impact resistance. When the ultimate pressure resistance value of the magnetic liquid seal is exceeded, the magnetic liquid seal will fail, and the sealing medium will leak a lot, which will cause great harm to the human body and the environment; Document 2 (the patent with the publication number of CN 103115152A) introduces a magnetic liquid and a labyrinth The disadvantage of the alternate combined seal is that it is only for the stepped shaft, and the maze space formed by the pole piece, the magnet and the stepped shaft is not a proportional parameter in the traditional design of the labyrinth seal. Often the ratio of the length of the magnet to the backlash is not Optimum ratio, so the throttling performance of the labyrinth is not good, in addition to 4 to 6 labyrinth grooves will greatly increase the axial length of the seal

Therefore, if the magnetic liquid seal is to be used in an environment where the pressure fluctuation of the sealing medium is large, it is necessary to design a magnetic liquid seal anti-shock device suitable for the blower with good throttling effect: the structure is simple, the axial distance is small, and it can solve the blower seal. The problem of large fluctuations in medium pressure

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