Reciprocating compressor packing sealing mechanism

Abstract

The invention provides a reciprocating compressor packing sealing mechanism. The reciprocating compressor packing sealing mechanism comprises packing sealing rings, air leakage sealing rings, pressurereducing rings and a metal spring ring, and a plurality of annular sealing ring grooves which are sequentially arranged are formed between a piston rod at the front end of the pressure reducing ringand a box body. According to the reciprocating compressor packing sealing mechanism, a series of closure gaps and expansion cavities are formed between the ring grooves, a sealed medium generates a throttling effect when passing through a gap of the zigzag labyrinth, high-pressure gas in an air cylinder is firstly subjected to primary pressure reduction at a labyrinth ring groove through the arrangement of the labyrinth type sealing ring groove, so that the impact of the high-pressure gas in the air cylinder is reduced, the sealing effect of the sealing ring is improved, and the service life of the packing sealing structure is prolonged; and the structure can be suitable for a gas storage compressor with the packing sealing pressure difference as high as 40MPa and an oil-free compressor with the sealing pressure difference of 20MPa. Meanwhile, in order to improve the convenience of on-site maintenance of the high-pressure packing, a pull rod connected with a packing box is designed ina sectional mode, and the packing can be divided into two sections to be detached.

Description

technical field [0001] The invention relates to a packing sealing mechanism of a reciprocating compressor. Background technique [0002] Reciprocating compressor packing is a sealing element used to prevent the gas in the cylinder from leaking to the middle body through the piston rod. The general high-pressure packing structure is as follows: figure 1 , decompression and sealing are carried out through the decompression ring and the main sealing ring. When impacted by high-pressure gas, the helical spring of the decompression ring and the outer ring of the sealing ring is often prone to fracture, and the service life of the sealing ring is low. At present, the high-pressure reciprocating type above 35MPa Compressors mostly adopt the form of differential cylinders to avoid excessive sealing pressure of the packing. Oil-free compressors are limited by the sealing performance and life of the packing. Generally, the sealing pressure does not exceed 10MPa. Due to the large numb...

AI Technical Summary

Problems solved by technology

Due to the large number of decompression rings and sealing rings in traditional high-pressure packing, the structural size of the packing assembly is long, and it is inconvenient to install and maintain on site. Sometimes the cylinder must be disassembled to complete the replacement of the packing, and the maintenance cost is high and the cycle is long.

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