Scroll vacuum pump with magnetic fluid translational sliding thrust bearing and sealing structure

Abstract

The invention discloses a scroll vacuum pump with a magnetofluid horizontal moving sliding thrust bearing and a sealing structure. The pump comprises a magnetofluid sealing device; the magnetofluid sealing device comprises a permanent magnet and a magnetizer; the permanent magnet is placed inside a piston rear support; the magnetizer is placed inside a thrust plate; meanwhile, magnetic flow liquid is injected into a gap between the magnetizer and the radial end face of the piston rear support. By the adoption of the pump, the magnetofluid sealing device is adopted in the winding end face of the vacuum pump; when a crank rotates, a piston front support and the piston rear support are driven to do radial winding relative to the thrust plate, and a closed magnetic field is generated between the permanent magnet and the magnetizer; the magnetic flow liquid forms a plurality of layers of closed magnetofluid O-shaped rings between a groove and the magnetizer; the magnetic flow liquid is utilized for achieving sealing of the scroll vacuum pump in the radial winding direction. Meanwhile, when the thrust plate is in contact with two planes of the piston rear support, the magnetic flow liquid can generate sliding thrust action under the action of a magnetic field, and therefore the effect is approximate to that of the sliding thrust bearing.

Description

Technical field [0001] The invention relates to the technical field of vacuum pumps, in particular to the technical field of a scroll vacuum pump with a magnetic fluid translational sliding thrust bearing and a sealing structure. Background technique [0002] At present, magnetic fluid sealing technology has been used for gas isolation in axial rotation, and used in vacuum pumps to replace traditional mechanical seals; magnetic fluid sealing technology is developed on the basis of magnetic fluid. When the magnetic fluid is injected into the gap of the magnetic field, it can fill the entire gap to form a "liquid O-ring seal". The function of the magnetic fluid sealing device is to transmit the rotating motion to the sealed container, but to seal the gap between the rotating shaft and the bearing, and is often used for vacuum sealing. figure 1 For a schematic diagram of a magnetic fluid sealing device, please refer to figure 1 Shown. It includes a shaft 11 and a housing 15 located...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a scroll vacuum pump with a magnetic fluid translational sliding thrust bearing and a sealing structure, apply the magnetic fluid sealing device technology to the vacuum pump, and use the magnetic fluid fluid to realize the seal in the orbiting direction of the scroll vacuum pump, so as to solve the problem. The problem that the existing vacuum pump cannot meet the sealing requirements

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