Piston assembly of air compressor

Abstract

The invention relates to a piston assembly of an air compressor, belonging to the technical field of air compressors. The piston assembly comprises a piston cover plate, a piston body and a sealing ring, wherein the piston cover plate is connected on the piston body by using a fastening piece and the sealing ring is assembled between the piston cover plate and the piston body. Compared with the prior art, the invention is characterized in that the sealing ring has an elliptic or quasi-elliptic annular outer edge surface which can be in movable sealing fit with the wall surface of the inner bore of a cylinder, the sealing ring is not apt to get loose because of rotation around the axis of the piston assembly under the impacts of factors such as vibration, inertia, deformation and the like, and the piston cover plate other than the sealing ring is also not apt to get loose; and moreover, the fastening position of the fastening piece is offset relative to the axis of the piston assembly, the formed offset can form the force arm of an anti-loose moment which can resist the loosening of the piston cover plate under rotation, and thereby the loosening of the piston cover plate under rotation can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of air compressors, in particular to an air compressor piston assembly. Background technique [0002] At present, component pistons are widely used in oil-free air compressors, and their typical structures are as follows: Figure 1 to Figure 3 As shown, that is, the piston is assembled from the piston cover plate 1, the piston body 2 and the sealing ring 3. The piston cover plate 1 is connected to the piston body 2 by the fastener 4, and the sealing ring 3 is fitted on the piston Between the cover plate 1 and the piston body 2, the piston body 2 is tightly connected with the connecting rod of the compressor or made in one piece. In addition, the piston body 2 can also be connected with the connecting rod through a bearing or a shaft pin structure; the above-mentioned piston assembly is placed in the In the cylinder of the compressor and in cooperation with the cylinder, the outer edge surface 3a of the seali...

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Problems solved by technology

However, it has been found in practice that there is a defect in the piston assembly in the prior art, that is, the outer edge surface 3a of the sealing ring 3 and the wall surface of the inner hole of the cylinder is made into an annular outer surface with a surface of revolution structure without exception. edge surface (which is figure 2 It can be clearly seen in the given view) so as to match the cylinder bore of the traditional circular cylinder. It is not difficult to find that the anti-loosening ability of the sealing ring 3 of this structure is relatively poor, because when the compressor is working , under the influence of various factors such as friction, vibration, inertia and deformation, the ring-shaped sealing ring 3 is very easy to rotate around the piston axis 01, and thus forms an additional moment to drive the piston cover 1 to loosen, which is the cause An important hidden danger of compressor "cylinder explosion" accident

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