A built-in anti-channeling oil piston structure

Abstract

The invention discloses an embedded oil pumping prevention piston structure. The embedded oil pumping prevention piston structure comprises a piston arranged in a cylinder jacket; a gap cavity is formed between the outer wall of the piston and the inner wall of the cylinder jacket; a gas ring groove and an oil ring groove are formed in the outer wall of the piston; a gas ring is mounted in the gas ring groove; an oil ring is mounted in the oil ring groove; the gas ring is movably arranged in the gas ring groove; a back gap cavity is formed between the gas ring and the side wall of the gas ring groove; a gap channel for conducting the back gap cavity with the gap cavity is formed between the gas ring and the upper wall and / or the lower wall of the gas ring groove; an assembly hole is formed in the piston body; an embedded part matched with the assembly hole is embedded in the assembly hole; and the embedded part is provided with a dredging channel with two conducted ends. The embedded oil pumping prevention piston structure uses a pressure difference generated in the pressurization process of an air compressor or an internal combustion engine, and uses the dredging channel for removing pumped oil in the back gap cavity of the piston, so that the service life of the air compressor or the internal combustion engine is longer, and the operation is more stable; and for manufacturing, the precision requirement is lower, the cost can be reduced, and the manufacturing is facilitated.

Description

technical field [0001] The invention belongs to the technical field of air compressors or internal combustion engines, and in particular relates to a built-in anti-bleeding piston structure for air compressors or internal combustion engines. Background technique [0002] For pistons of air compressors or internal combustion engines, the outer wall of the piston is provided with three sealing ring grooves from top to bottom (see patent CN202108699U and patent CN104329239A), which are respectively the first ring groove, the second ring groove and the third ring groove, wherein The first ring groove and the second ring groove are respectively installed with the first air ring and the second air ring which are air-tightly matched with the inner wall of the cylinder liner, and the third oil ring is installed in the third ring groove which is oil-tightly matched with the inner wall of the cylinder liner. The first air ring and the second air ring are used for the air seal between ...

AI Technical Summary

Problems solved by technology

For example, the patent CN102588252A and the patent CN101334021A are improved in terms of materials, so that the sealing ring or the inner wall of the cylinder liner is more wear-resistant, so as to maintain a more durable sealing performance between the piston and the cylinder liner; The structure of the gas ring and / or oil ring is improved to make the sealing effect between the sealing ring and the inner wall of the cylinder liner better to prevent oil blow-by. In short, these solutions all use the "blocking" method to solve the problem, but the actual The use effect is not ideal, and a better effect may be achieved in a short period of time in the early stage, but after a period of operation, the problem remains after the gas ring and oil ring are worn out. And it will also increase; and adopt the "blocking" method, even if the oil leakage problem can be effectively improved, but on the other hand, it will also reduce the amount of oil distribution on the inner wall of the cylinder liner, thereby increasing the friction loss between the piston and the inner wall of the cylinder liner. Conducive to the normal use of air compressors or internal combustion engines

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